DE202010006605U1 - central valve - Google Patents

Abstract

A central valve (12) for a Schwenkmotorversteller (59), in which a hollow piston (23) is guided within a sleeve (22) axially successively a radial oil supply port (P), a first radial working port (B) and a second radial working port (A), wherein these two opposite directions of rotation of the Schwenkmotorverstellers (59) associated working ports (B, A) followed by a Tankabfluss (T), which is arranged exclusively at one end of the central valve (12), wherein the socket (22) has a tank outflow channel (38) leading to the tank outlet (T) circumferentially offset from the second working connection (A),
- The fluid from the first working port (B) at the second working port (A) dissipates when it is supplied from the oil supply port (P) with fluid and
- Directly discharges the fluid from the second working port (A) when the first working port (B) from the oil supply port (P) is supplied with fluid,
wherein the tank discharge channel (38) is delimited by an attachment (35) in which the socket (22) is inserted ...

Description

The Invention relates according to claim 1, a central valve for a Schwenkmotorversteller.

From the DE 10 2005 041 393 A1 For example, a central valve for a Schwenkmotorversteller is already known, which has in accordance with the invention, a piston which is guided within a socket. Axially consecutive a radial oil supply port P is provided, which is followed by a first radial working port B and a second radial working port A. This second radial working port A is followed by a tank outlet T, which forms the single tank outlet T. The piston is not rotationally symmetrical and has two separate and guided past each other channels. To move the piston axially, is applied to this a push rod of an actuator.

Also the DE 10 2005 052 481 A1 shows a central valve for a Schwenkmotorversteller. In this central valve also follow the two working ports A, B the oil supply port P, which in turn follows a single tank runoff T.

Furthermore, from the DE 103 22 394 A1 a Schwenkmotorversteller known within which a hydraulic valve is provided.

task The invention is to provide a central valve, which in cost One connection sequence P-B-A-T allows.

These Task is according to the invention with the features of claim 1 solved.

According to one Advantage of the invention is inventively Hollow piston application, which has a central recess. This Hollow piston is displaceable in a bush which is circumferentially offset to a second working port A a leading to the tank drain T. Tank outlet channel has. As a result of this circumferential Offset it is possible, the fluid at the second working port A to pass over to the tank drain T. The fluid can axially or also radially discharged from the central valve become.

In particularly advantageously, this can be circumferential offset tank drainage channel in common from the socket and an attachment be formed. This essay can be made in particular of a plastic be manufactured, which is sprayed onto the socket. The essay but can also be used as a separate part, for example as a deep-drawn part be made of sheet metal. The necessary in this essay openings for Production of the tank runoff can be cost-effective be punched out. But also openings for the adjacent second working port A can from the Attachment punched or drilled in these. In case of Plastic can use the openings be made in the injection process. With the essay will determines in which direction - d. H. axial or radial - that Fluid is discharged. To have a processing after assembly From the essay on the socket to prevent, the essay position-oriented and be mounted secured against rotation.

Of the Essay can be cup-shaped in particular, so that its Pot bottom as a support for a helical compression spring can be used, which opposes the force of an actuator acts. This helical compression spring relies on the other hand on the hollow piston. This can, for example, in the hollow piston Inserted closure body may be provided on which the helical compression spring is supported.

Of the Attachment, for example, an injection molded plastic be or be created in the metal injection molding process.

The inventive central valve allows it in a particularly advantageous manner pressure fluctuations in the first working port B associated pressure chambers of the Schwenkmotorverstellers to use that assigned to the opposite direction of rotation Supply pressure chambers with sufficient fluidic volume flow. These Pressure fluctuations result from the camshaft alternating torques, which adjust on the camshaft in response to the gas exchange valve forces. The smaller the number of combustion chambers per camshaft, the stronger the camshaft change moments, so that the use of the camshaft alternating moments in particular extent Offers combustion engines with three cylinders. Furthermore, influencing parameters nor the strength of the gas exchange valve springs and the camshaft speed.

In a particularly advantageous embodiment is the essay pressed onto the socket. This allows a free Design of the tank drainage channels. You can choose any be designed, resulting in better utilization of existing cross-sections allowed. The number of tank drainage channels and their cross section determine the flow resistance at the tank drain T.

claim 14 shows a particularly advantageous embodiment of the invention in which several functional surfaces in one piece to the essay are provided so that koaxialiätsfehler are reduced, as they might otherwise occur with different components.

Further advantages of the invention will become apparent the further claims, the description and the drawings.

The Invention is described below with reference to several embodiments explained in more detail.

there demonstrate

1 a Schwenkmotorversteller in a sectional view,

2 in a perspective view of a central valve, which in a Schwenkmotorversteller according to 1 is used,

3 in a sectional view of the central valve 2 wherein its hollow piston is unloaded by an electromagnetic actuator,

4 the central valve off 3 , wherein the hollow piston of the electromagnetic actuator is loaded axially maximum,

5 the central valve off 2 to 4 , wherein the hollow piston is in a central position,

6 in a second embodiment, a longitudinal section of a central valve, in which a long attachment is provided with a deferred sieve,

7 the central valve according to 6 in a cross section,

8th in a third embodiment, a longitudinal section of a central valve, in which a cap has no integrated spring plate function,

9 the central valve according to 8th in a cross section,

10 in a fourth embodiment, a longitudinal section of a central valve in which check valve supply holes are located at the end remote from a screw head end of the central valve,

11 the central valve off 10 , wherein a hollow piston is shifted maximum,

12 the central valve off 10 , wherein the hollow piston in an intermediate position between the positions according to 10 and 11 is,

13 the central valve according to 10 to 12 in a cross section,

14 in a fifth embodiment, a longitudinal section of a central valve, in which for both working ports or both directions of rotation each own check valve supply holes are provided and

15 the central valve according to 14 in a cross section.

With a Schwenkmotorversteller 59 according to 1 is changed during operation of an internal combustion engine, the angular position between the crankshaft and the camshaft. By turning the camshaft, the opening and closing times of the gas exchange valves are shifted so that the internal combustion engine brings its optimal performance at the respective speed. The Schwenkmotorversteller 59 allows a stepless adjustment of the camshaft relative to the crankshaft. The Schwenkmotorversteller 59 has a cylindrical stator 1 on, the rotation with a drive wheel 2 connected is. In the embodiment, the drive wheel 2 a sprocket over which a chain, not shown, is guided. The drive wheel 2 but may also be a toothed belt, over which a drive belt is guided as a drive element. About this drive element and the drive wheel 2 is the stator 1 Driven with the crankshaft.

The stator 1 comprises a cylindrical stator base body 3 , on the inner side radially inwardly at equal intervals webs 4 protrude. Between neighboring bridges 4 become spaces 5 formed, into, over, a in 2 to 5 closer illustrated central valve 12 controlled, pressure medium is introduced. Between neighboring bridges 4 protrude wings 6 radially outward from a cylindrical rotor hub 7 a rotor 8th protrude. These wings 6 divide the spaces between 5 between the bridges 4 each in two pressure chambers 9 and 10 ,

The bridges 4 lie with their end faces sealingly on the outer circumferential surface of the rotor hub 7 at. The wings 6 in turn lie with their end faces sealingly on the cylindrical inner wall of the stator main body 3 at.

The rotor 8th is rotatably connected to the camshaft, not shown. To change the angular position between the camshaft and the crankshaft, the rotor becomes 8th relative to the stator 1 turned. For this purpose, depending on the desired direction of rotation, the pressure medium in the pressure chambers 9 or 10 pressurized while each other's pressure chambers 10 or 9 be relieved to the tank. To the rotor 8th opposite the stator 1 to pivot counterclockwise in the position shown are from the central valve 12 radial bores 11 in the rotor hub 7 put under pressure.

This central valve 12 is in 2 seen in a perspective view as a single part. Here is the central valve 12 in the mounted state in the rotor hub 7 plugged in and / or screwed. In alternative drawings, not shown, it is also possible, the central valve 12 into the camshaft or a separate camshaft end piece and / or screw. The radial bores 11 the rotor hub 7 lead doing in an annular groove 15 of the central valve 12 , which forms a second working port A. In this ring groove 15 leads a group of radial holes 14 of the central valve 12 , This group of radial holes 14 is even at the circumference of the central valve 12 distributed.

Regarding a central axis 13 axially next to this second working port A, a first working port B is provided, which is of an annular groove 16 is formed. This first working port B leads to unspecified radial bores of the rotor hub 7 which is in a plane behind the plane of the drawing according to 1 lie. These unspecified radial holes of the rotor hub 7 lead into pressure chambers 9 , which is the pivoting of the rotor 8th are assigned in a clockwise direction. The two working ports A, B associated and immediately adjacent groups before radial bores 14 . 17 are in principle equivalent connections. Their bores associated with the first working port B. 17 delimit from the group of non-return valve feed holes 18 of the first working port B from. This second group of check valve delivery holes 18 in the first working port B is the use of camshaft alternating torques for a quick pivoting of the rotor 8th or a pivoting of the rotor 8th despite low oil pressure at an oil supply connection P.

The oil supply port P is closed to the first working port B with respect to the central axis 13 axially. Thus, the first working port B is located between the second working port A and the oil supply port P. In an annular groove 19 of the oil supply port P is an annular sieve 20 used, this oil supply port P before the ingress of dirt particles in the central valve 12 protects. The annular sieve 20 is shaped in the manner of an annular band. Instead of a closed ring, the sieve 20 also be formed as an open band, which overlaps at its ends. In this case, the tape is spread apart for mounting and then on the socket 22 postponed.

In 3 it can be seen that even in the annular groove 19 of oil supply port P holes 21 are provided on the circumference of the central valve 12 a socket 22 are arranged.

Within this socket 22 is a hollow piston 23 arranged axially displaceable. 3 shows the unloaded central valve 12 , The central valve 12 is considered to be relieved when one at the P-side end of the hollow piston 23 fitting end of a push rod 24 from an electromagnet 25 is unloaded. In this state is the electromagnet 25 energized. The pushrod 24 is at the central valve 12 facing the end 26 executed with a rounding, so that the contact surface is idealized - that is, punctiform under the suppression of Herz'schen pressure.

In this unloaded state of the central valve 12 becomes the hollow piston 23 from a helical compression spring 29 against an axial stop 34 pressed. This axial stop 34 is formed by an axial securing ring, which at the P-side end in an inner annular groove of the socket 22 is used. The helical compression spring 29 is on the other hand at the opposite end - ie at a T-side end - the socket 22 arranged. This helical compression spring is supported 29 on the one hand indirectly via an essay 35 at the socket 22 from. On the other hand, the helical compression spring is supported 29 indirectly via a closure body 36 on the hollow piston 23 from. This is this closure body 36 at the T-side end within a first ring land 30 on the hollow piston 23 used, so that this end is closed. At this first ringbridge 30 is a first paragraph 32 provided, this first ring land 30 from an annular groove 50 demarcates. Along this paragraph 32 is a partial flow from the second working port A via a plurality of transverse bores 27 in the hollow piston 23 and longitudinally aligned tank drainage channels 38 led to the tank drain T. Another partial flow flows along the annular groove 50 directly from the second working port A to the tank drain T, without passing through the interior of the hollow piston 23 to flow. For the passage of the hydraulic fluid, tank bores T are associated with radial bores 28 in the socket 22 axially between the radial bores 14 . 17 the two working ports A, B arranged. The ring groove 50 will be on the paragraph 32 opposite side of a second paragraph 33 limited. The second paragraph 33 is thus at a second ring land 31 on the first Ringsteg 30 arranged facing side. This second paragraph 33 closes the radial bore 28 to the tank drain T when the electromagnet 25 fully energized, so that the pushrod 24 the hollow piston 23 in the in 4 shifts position shown.

In this case, there is one on the other - ie P-side - side of the second ring land 31 is third paragraph 37 the hydraulic flow to the tank outlet T associated radial bore 28 free. The river leads from the regular holes 17 over one between the first two ring bridges 30 . 31 forming annular groove of the first working port B to the tank outlet T associated radial bore 28 which, in turn, via said tank drainage channels 38 past the second working port A to the tank. The tank drainage channels 38 be between the socket 22 and the tower 35 educated.

• – Querbohrungen 41 und
• – einen zentralen Kanal 42

im Hohlkolben 23 und durch die Querbohrungen 27 zum zweiten Arbeitsanschluss A geleitet. Dabei ist der vierte Absatz 40 an einem vierten Ringsteg 45 angeordnet.While the pressure chambers associated with the first working port B are relieved to the tank, the pressure chambers associated with the second working port A are in the position according to 4 filled. For this purpose, the fluid from the oil supply port P through the sieve 20 and a belt-shaped pump check valve 39 along a fourth paragraph 40 , by

• - Cross holes 41 and
• - a central channel 42

in the hollow piston 23 and through the cross holes 27 directed to the second working port A. Here is the fourth paragraph 40 on a fourth ring bridge 45 arranged.

When filling the second working port A associated pressure chambers whose need for fluid under certain conditions is greater than can be nachgefördert of the oil pump to flow. This problem solves the radial check valve delivery bore associated with the use of camshaft change torques 18 that of a band-shaped check valve 43 is closed, which opens for radially coming from outside pressures. On the other hand, radial pressures coming from inside are blocked. The pump check valve works in the same way 39 , Thus, whenever the camshaft leads in the direction of rotation to be adjusted, the oil pump, together with the pressure chambers assigned to the other direction of rotation, always provides the increased demand for fluid. However, if the camshaft endeavors to rotate in the "wrong" direction of rotation due to the gas exchange valve spring forces, the resulting volume flows are blocked.

One axially inside the bush 22 between the oil supply port P and the radial check valve supply hole 18 for the FastPhaser arranged radially inwardly directed annular first inner web 44 only has the function, the check valve 43 and the pump check valve 39 to secure against axial displacement.

• – dem zweiten Arbeitsanschluss A und
• – dem Ölversorgungsanschluss P.

On the other hand, one separates within the socket 22 axially between the first holes 17 and the check valve inlet bores 18 the first working port B arranged radially inwardly directed second inner web 46 the first working connection B of

• - the second working port A and
• - the oil supply connection P.

In addition, the inner bridge separates 46 the first working port B from the return flow inlet bores 18 the connection for the camshaft alternating torque use.

For this purpose, the second inner bridge forms 46 with a third ring land located radially inwardly therefrom 47 a sealing gap. This third ring bridge 47 lies axially between the second ring land 31 and the fourth ring bridge 45 , The third ring bridge 47 has a fifth heel facing the T-side end 48 on.

5 shows the central valve 12 with the hollow piston 23 in a central position, which is reached when the electromagnet is disengaged halfway. This arises at the central valve 12 an overlap control, in which the two directions of rotation associated pressure chambers, a higher volume flow can be supplied as can be discharged to the tank. For this purpose, with respect to the two adjacent ring lands 45 . 47 opposite paragraphs 40 . 48 only a very short sealing gap with respect to the bush 22 on. On the other hand, the second ring land has 31 on both sides of the radial bores 28 two relatively large sealing gaps to the socket 22 on. That is, the paragraphs 33 at the second ring land 31 and a sixth paragraph disposed opposite thereto 49 form relatively large sealing gaps with the socket 22 , In the process, these two sealing gaps close the radial bore leading to the tank outlet T 28 relatively tight. This ensures that in the illustrated central position of the rotor relative to the stator is held in a certain angular position.

2 thus shows the admission of a pressure chambers while relieving the other pressure chambers to the tank.

3 shows, however, the admission of the other pressure chambers while relieving the pressure chambers to the tank.

According to 2 to 5 has the socket 22 at the P-side end of an external thread 60 which is followed by a covenant leading to a tool attack 61 can be formed. For example, as a tool attack 61 a hexagon be formed. This makes it possible to use the central valve 12 in the Schwenkmotorversteller 59 or in the camshaft or a Nockenwellenendstück einzu Screw. In an alternative embodiment, the external thread can also be provided at the other end in order to clamp the rotor against the camshaft.

At the opposite end is the essay 35 intended. This is made as a plastic injection molded part. The essay 35 has the annular groove 15 on, in whose base openings 51 are provided, which with the second working port A associated radial bores 14 aligned. Thus, the fluid spreads from these openings 51 evenly in the annular groove 15 , This ring groove 15 is axially bounded on both sides by ring lands 52 . 53 , At the T-end is the essay 35 to a zapfenfömigen tail 54 formed, on which the helical compression spring 29 axially supported in said manner. Circumferentially between the openings 51 are on the pin-shaped end piece 54 parallel to the central axis 13 extending slots 55 provided in the socket 22 as longitudinal grooves 56 continue and together with the inner wall 57 of the essay 35 the tank drainage channels 38 form. So are these tank drainage channels 38 or the longitudinal grooves 56 circumferentially between the openings 51 arranged.

• – für die Einlassventile oder
• – für die Auslassventile

aufgesetzt ist. Außerdem wird die bevorzugte Drehrichtung des Schwenkmotorverstellers durch die Vorspannung einer nicht näher dargestellten Spiralfeder bestimmt, welche den Rotor gegenüber dem Stator vorspannt und das Reibmoment der Nockenwelle gegenüber dem Gaswechselventiltrieb kompensiert. Dabei kann die Spiralfeder so stark ausgelegt sein, dass sie das Reibmoment überkompensiert oder auch so schwach ausgelegt sein, dass sie das Reibmoment nicht gänzlich kompensieren kann. Eine solche Spiralfeder ist beispielsweise in der nicht vorveröffentlichten DE 10 2009 048 238.5 dargestellt. Auch von deren Auslegung hängt es ab, ob der Anschluss für die Nockenwellenwechselmomentennutzung eher zu den der Drehrichtung in Früh oder der Drehrichtung in Spät zugeordneten Druckkammern führt.The pressure chambers at the first working port B assigned to the use of camshaft alternating torques can be assigned to the adjustment after early or the adjustment after late. Depending on whether the Schwenkmotorversteller on the camshaft

• - for the intake valves or
• - for the exhaust valves

is attached. In addition, the preferred direction of rotation of the Schwenkmotorverstellers is determined by the bias of a coil spring, not shown, which biases the rotor relative to the stator and compensates the friction torque of the camshaft relative to the gas exchange valve drive. In this case, the coil spring can be designed so strong that they overcompensated the friction torque or be designed so weak that they can not fully compensate for the friction torque. Such a coil spring is for example in the not pre-published DE 10 2009 048 238.5 shown. It also depends on their design, whether the connection for the camshaft alternating torque use rather leads to the direction of rotation in the morning or the direction of rotation in late assigned pressure chambers.

6 shows in a second embodiment, a longitudinal section of a central valve 112 , Here is an unspecified solenoid for axial displacement of a hollow piston 123 energized. In this central valve 112 is a long essay 135 with a deferred sieve 120 intended. For this purpose, the essay extends 135 on the socket 122 to the sieve 120 , This sieve 120 is axially between a paragraph 58 the socket 122 and the end face 62 secured against axial displacement. The sieve 120 is before the attachment of the essay 135 pushed axially, which is easy to install. The closure body 136 is in contrast to the previous embodiment in the hollow piston 123 screwed. The closure body 136 has a covenant 63 on, at the front end of the hollow piston 123 comes to a stop.

The holes 117 and the check valve delivery holes 118 are aligned with holes 64 . 65 in the long essay 135 aligned. This alignment can be done during assembly. But it is also possible, the holes 64 . 65 to drill only after assembly.

• – der Versorgungsanschluss P,
• – der erste Arbeitsanschluss B mit dessen Rückschlagventil-Zufuhrbohrungen 118 und Bohrungen 117,
• – der zweite Arbeitsanschluss A und
• – der Tankabfluss T.

The essay 135 has three ring lands 75 . 76 . 77 on, which are axially spaced from each other. These ring bridges 75 . 76 . 77 disconnect the connections from each other. These connections are in axially sequential order:

• The supply connection P,
• - The first working port B with its check valve supply holes 118 and drilling 117 .
• - the second working port A and
• - the tank drain T.

The fact that the three ring lands all on one component - namely the essay 135 Are arranged, Koaxialiätsfehler are reduced, as they might otherwise occur in different components.

7 shows the central valve 112 according to 6 in a cross section. It becomes clear that the tank drainage channels 138 in contrast to the previous embodiment are self-contained. That is, the walls of the tank drainage channels 138 are formed exclusively by the attachment, so that the socket 122 no wall of the tank drainage channels 138 forms. The socket 122 is radially between the inner wall 66 and the hollow piston 123 arranged.

Otherwise, the central valve 112 analogous to the central valve 12 configured in the previous embodiment. It can clearly be seen that the leading to the second working port A radial bores 114 at an angle circumferentially between the tank drainage channels 138 are arranged.

8th shows in a third embodiment, a longitudinal section of a central valve 212 , In contrast to the previous embodiments, the essay 235 no integrated Fe ller-made functional. The helical compression spring 229 is instead axially on a disk 68 supported, which in the socket 222 is pressed. Thus, the essay needs 235 in contrast to the previous embodiments, no bottom and is designed sleeve-shaped.

The radial bores 214 of the second working port A can after installation of the essay 235 through this essay 235 and the socket 222 are completely drilled, whereby a directed pressing of the essay can be omitted. It is also possible to drill the socket prior to assembly and to drill the attachment after assembly.

Although in this embodiment, the external thread 260 in the area of the helical tool attack 61 is provided, it would be particularly easy, an external thread on the camshaft side valve end 67 provided. Such a drawing, not shown external thread allows to clamp the rotor against the camshaft.

The essay 235 has a simple geometry as a turned part and can for example be machined from a metallic material.

9 shows the central valve according to 8th in a cross section.

10 shows in a fourth embodiment, a longitudinal section of a central valve 312 in which check valve supply bores 318 on the head of a screw 361 far end of the central valve 312 lies. In this 10 is the central valve 312 represented in the electromagnets de-energized state. The central valve 312 has an essay 335 on, basically the essay 35 of the first embodiment is relatively similar. However, within the essay 335 axially spaced from each other, the check valve supply bores 318 and the regular holes 317 the first working port B provided. This is indicated by the essay 335 a common annular groove 316 on. The hollow piston 323 is located in 10 in a position in which the helical compression spring 329 this until the axial stop 334 suppressed. The hydraulic pressure from the supply port P is supplied to the first working port B and a check valve 343 closes the check valve feed holes 318 , The second working port A is by means of two ring lands 69 . 70 against the annuli 71 . 72 locked within the supply port P and the first working port B. The second working port A, however, is analogous 3 along the tower 335 guided tank drainage channel 338 relieved against the tank drain T. As a result, the tank drainage channel becomes 338 at the first working port B and at the check valve supply bores 318 passed by.

11 the central valve off 10 , with electromagnet fully energized, so that the hollow piston 323 maximum against the helical compression spring 329 is moved. However, the helical compression spring is neither moved to spring winding stop still running the hollow piston 223 against a stop. The limitation is, however, by the maximum stroke of the electromagnet or actuator, which is a push rod 24 analogous 3 actuated. In this position according to 11 the hydraulic pressure is passed directly from the supply port P to the second working port A. The regular holes 317 of the first working port B are from the said two ring lands 69 . 70 against the annulus 71 within the supply port P and an annulus 73 inside the check valve feed holes 318 blocked. The first working port B is however via the analog 3 along the tower 335 guided tank drainage channel 338 relieved against the tank drain T.

12 shows the central valve 312 , where the hollow piston 223 in an intermediate position between the positions according to 10 and 11 located. Ie. the electromagnet is partially energized. It can be seen that the two ring lands 69 . 70 on the supply side - ie from the supply connection P - a lower overlap with the socket 322 have, as the drain side to the tank drain channel 338 , This relationship will be closer in the EP 1 331 367 A2 explained.

13 shows the central valve according to 10 to 12 in a cross section.

14 shows in a fifth embodiment, a longitudinal section of a central valve 412 , in which for both working ports A, B and both directions of rotation in each case a check valve supply holes 418 . 74 is provided. Analogous to the preceding embodiments is a sieve 420 provided at the supply terminal P. The essay 435 is basically similar to the article according to the fourth embodiment 10 to 13 executed.

15 shows the central valve according to 14 in a cross section.

It is also possible the use of camshaft alternating torques assign to both directions of rotation by two working ports A, B additional holes for the use of camshaft alternating torques be assigned.

The Central valve may be screwed in particular in the stator. However, it is also possible to use the central valve in the rotor screwed. Instead of the screw shape shown, the central valve also be executed with a threaded pin on the one Nut is screwed on. It is also possible to use the central valve in the camshaft itself or a Nockenwellenendstück screwed. The external thread does not have to be on the P-side Be provided for at the end. It is also possible a different axial position. Such another axial position is particularly useful, then if with the central valve the rotor braced against the camshaft shall be.

The Slots in the attachment do not have to be parallel to the central axis be aligned. The slots can in the essay and / or be incorporated in the socket.

Of the Hollow piston does not have to be designed with ring lands. It is also possible, the hollow piston only with radial holes perform. In that case, then the paragraphs formed by the edges of the holes. It also does not have to be necessary be to drill these openings in the hollow piston. Is the hollow piston For example, as an injection molded part made of plastic or as an MIM component Made in metal injection molding, so can the openings also be made in this injection molding process.

at an alternative embodiment is for both work connections a use of camshaft alternating torques provided.

at Another alternative embodiment is the check valve supply wells to use the camshaft alternation moments axially between the two Working connections A, B arranged.

at the described embodiments are only by exemplary embodiments. A combination of the described Features for different embodiments is also possible. Further, in particular not described features the device parts belonging to the invention, are the in the drawings illustrated geometries of the device parts refer to.

1

stator

2

drive wheel

3

stator base

4

Stege

5

interspaces

6

wing

7

rotor hub

8th

rotor

9

pressure chamber

10

pressure chamber

11

radial drilling

12

central valve

13

central axis

14

radial drilling

15

ring groove

16

ring groove

17

drilling

18

Check valve supply holes

19

ring groove

20

scree

21

drilling

22

Rifle

23

hollow piston

24

pushrod

25

electromagnet

26

The End

27

cross holes

28

radial drilling

29

Helical compression spring

30

first ring land

31

second ring land

32

first paragraph

33

second paragraph

34

axial stop

35

essay

36

closure body

37

third paragraph

38

Tank drainage channels

39

Pump check valve

40

fourth paragraph

41

cross holes

42

centrally channel

43

check valve

44

first inner web

45

fourth ring land

46

second inner web

47

third ring land

48

fifth paragraph

49

sixth paragraph

50

ring groove

51

openings

52

ring land

53

ring land

54

pin-shaped tail

55

slots

56

longitudinal grooves

57

inner wall

58

paragraph

59

Schwenkmotorversteller

60

external thread

61

tool application

62

face

63

Federation

64

drilling

65

drilling

66

Inner wall

67

camshaft-sided valve end

68

disc

69

ring land

70

ring land

71

annulus

72

annulus

73

annulus

74

Check valve supply holes

75

first ring land

76

second ring land

77

third ring land

112

central valve

114

radial drilling

117

drilling

118

Check valve supply holes

120

scree

122

Rifle

123

hollow piston

135

essay

136

closure body

138

Tank drainage channels

212

central valve

214

radial drilling

222

Rifle

229

Helical compression spring

235

essay

260

external thread

312

central valve

317

drilling

318

Check valve supply holes

323

hollow piston

329

Helical compression spring

334

axial stop

335

essay

338

Tank drainage channels

343

check valve

361

screw head

412

central valve

418

Check valve supply holes

420

scree

435

essay

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• DE 102005041393 A1 [0002]
• DE 102005052481 A1 [0003]
• - DE 10322394 A1 [0004]
• - DE 102009048238 [0054]
• - EP 1331367 A2 [0068]

Claims (14)

Central valve ( 12 ) for a Schwenkmotorversteller ( 59 ), in which a hollow piston ( 23 ) within a socket ( 22 ), which has a radial oil supply connection (P), a first radial working connection (B) and a second radial working connection (A) in axial succession, these two opposite directions of rotation of the Schwenkmotorverstellers ( 59 ) associated with working ports (B, A) is followed by a tank outlet (T) which is located exclusively at one end of the central valve ( 12 ) is arranged, wherein the socket ( 22 ) circumferentially offset to the second working port (A) leading to the tank runoff (T) Tankabflusskanal ( 38 ) discharging the fluid from the first working port (B) past the second working port (A) when it is supplied with fluid from the oil supplying port (P); and discharging the fluid directly from the second working port (A) when the fluid first working port (B) is supplied with fluid from the oil supply port (P), the tank discharge port (B) 38 ) of an essay ( 35 ) in which the bushing ( 22 ) is inserted. Central valve ( 12 ) according to claim 1, characterized in that the tank drainage channel ( 38 ) from the socket ( 22 ) together with the article ( 35 ) is formed, in which the socket ( 22 ) is inserted. Central valve ( 12 ) according to claim 1 or 2, characterized in that the first working port (B) can be supplied with fluid from the oil supply port (P) via a hydraulic flow which is radially between the hollow piston ( 23 ) and the socket ( 22 ), whereas the second working port (A) can be supplied with fluid from the oil supply port (P) by means of a hydraulic flow which is within the hollow piston ( 23 ) runs. Central valve ( 12 ) according to one of the preceding claims, characterized in that for the first working port (B) has an opening (bore 17 ) in the socket ( 22 ) is provided, wherein between this opening (bore 17 ) and the oil supply port (P) has an opening (hole 18 ) is provided for the use of camshaft alternating torques. Central valve ( 12 ) according to claim 4, characterized in that the opening (bore 18 ) leads to the use of camshaft alternating torques in the same first working port (B), as the axially adjacent opening (bore 17 ) for the use of the camshaft alternating torques. Central valve ( 12 ) according to claim 5, characterized in that in the bush ( 22 ) inside the two axially adjacent openings (holes 17 . 18 ) of the first work connection (B) has a radially inwardly projecting inner web ( 46 ) is provided, which together with a ring land ( 47 ) can form a sealing gap, the fluid exchange between the two axially adjacent openings (bores 17 . 18 ) locks when a fluid flow from the oil supply port (P) to the second working port (A) and a separate fluid flow from the opening (bore 17 ) of the first working port (B) to the tank discharge (T) is passed, so that from the opening (bore 18 ) is introduced to use the camshaft alternating moments fluid in the first-mentioned fluid flow. Central valve ( 12 ) according to claim 6, characterized in that in the socket ( 22 ) inside the opening (hole 21 ) of the oil supply connection (P) and of this opening (bore 21 ) axially adjacent opening (bore 18 ) for the use of the camshaft alternating moments check valves ( 39 . 43 ) are used. Central valve ( 12 ) according to claim 7, characterized in that the check valves ( 39 . 43 ) are band-shaped and axially from each other by means of a radially inside the bushing ( 22 ) radially inwardly projecting inner web ( 4 ) are separated. Central valve ( 12 ) according to claim 3, characterized in that a helical compression spring axially on the one hand on the essay ( 35 ) and on the other hand on the hollow piston ( 23 ) is supported. Central valve ( 12 ) according to claim 9, characterized in that the helical compression spring ( 29 ) against a closure body ( 36 ) is supported, which in the hollow piston ( 23 ) is used. Central valve ( 12 ) according to any one of the preceding claims, characterized in that at the tank outlet (T) opposite end of an external thread into the socket ( 22 ) is cut. Central valve ( 12 ) according to one of the preceding claims, characterized in that at the end of the tank drain (T), an external thread is provided, with which the rotor is braced against the camshaft. Central valve ( 12 ) according to one of the preceding claims, characterized in that for both working ports (A, B) in each case at least one check valve supply bore ( 74 . 418 ) is provided for the use of camshaft alternating torques. Central valve ( 12 ) according to one of the preceding claims, characterized in that the attachment ( 135 ) a plurality of axially spaced-apart annular webs ( 75 . 76 . 77 ), which separate the supply port (P), the two working ports (A, B) and the tank drain (T) from each other.