JP2006266337A - Mounting structure of hydraulic tensioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve assemblability of a bush and a collar constituting a mounting joint in a mounting structure of a hydraulic tensioner.
In a mounting structure of a hydraulic tensioner 10, a mounting joint 70 is fitted with a bush 80 in a mounting hole 71 and a collar 90 is loaded into the bush 80, and the bush 80 is mounted from the other end side. When fitted into the hole 71, the end of the collar engaging piece 83 is deformed inward by the abutment of the outward projecting portion 83A of the collar engaging piece 83 and the hole surface of the mounting hole 71, and the collar The tip of the engagement piece 83 is engaged with the other end surface of the collar 90.
[Selection] Figure 4

Description

  The present invention, for example, in a hybrid vehicle, such as an auto tensioner that is provided between a fixed member such as an engine block and an idle pulley and tensions a belt or chain stretched between a driving wheel and a driven wheel, The present invention relates to a mounting structure for a hydraulic tensioner.

  Since the auto tensioner applies tension to the belt or chain (hereinafter referred to as a belt), when the tension of the belt increases and the plunger is compressed, a damping force is generated against the compression, and the tension of the belt is reduced and the plunger is reduced. When trying to stretch, try to speed up the stretching.

As a conventional hydraulic tensioner, as described in Patent Documents 1 and 2, a plunger is slidably inserted into a cylinder, and a mounting joint is provided in a mounting hole at each end of the cylinder and the plunger. . These mounting joints are formed by fitting a bush into the mounting hole and loading the bush with a collar, fixing one mounting joint to the side of the fixing member and the other mounting joint indirectly to the idle pulley. It is a direct link.
Japanese Patent Laid-Open No. 9-14447 Patent 3049556

  In the conventional hydraulic tensioner, the above-described mounting joint has a bush fitted in a mounting hole, a collar is inserted into the bush, and a member to be mounted is inserted into the collar. In the prior art, a collar is press-fitted into the bush, or an annular protrusion provided on the inner periphery of the bush is engaged with an annular groove provided on the outer periphery of the collar to prevent the collar from being detached and to ensure swingability. is there.

  However, it takes time to assemble the one that press-fits the collar into the bush. Even when the bush and the collar are engaged by the protrusion and the groove, there is a process of press-fitting until the protrusion is engaged with the groove, so that the assembly is troublesome.

  An object of the present invention is to improve the assemblability of the bush and the collar constituting the mounting joint in the mounting structure of the hydraulic tensioner.

  The invention of claim 1 is a hydraulic tensioner mounting structure in which a plunger is slidably inserted into a cylinder, and mounting joints are provided in mounting holes at respective ends of the cylinder and the plunger. A bush is fitted into the mounting hole, and a collar is loaded into the bush. An engagement locking portion that engages with the outer edge of the one end opening of the mounting hole and an end surface of the collar are engaged with the bush. A collar engaging portion for stopping, provided with collar engaging pieces at a plurality of positions in the circumferential direction of the other end surface of the bush, provided with an outward projecting portion on the outer peripheral surface of the collar engaging piece, and the bush from the other end surface side. When the collar engaging piece is fitted into the mounting hole, the end of the collar engaging piece is deformed inward by the abutment of the outward projecting portion of the collar engaging piece and the hole surface of the mounting hole, and the collar engaging piece The tip of the arm is engaged with the other end of the collar Than it is.

  According to a second aspect of the present invention, in the first aspect of the invention, the collar engaging piece further has a protruding shape that faces outward in the axial direction on the other end surface of the bush.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the collar engaging piece is disposed adjacent to the collar engaging piece at a plurality of positions in the circumferential direction of the other end surface of the bush, and is related to the outer edge of the other end opening of the mounting hole. A fitting engagement claw is provided.

  According to a fourth aspect of the present invention, in the third aspect of the invention, the other end surface of the bush further forms an annular recess on the inner peripheral side of the collar engaging piece and the mounting engaging claw, and the collar engaging piece and the mounting engaging A slit-like recess is formed on the side of the nail in the circumferential direction.

(Claim 1)
(a) The collar is preloaded in the inner diameter of the bush, and the bush is inserted into the mounting hole and fitted. On one end surface of the bush, the collar locking portion of the bush is locked to one end surface of the collar. At the other end surface of the bush, the tip end portion of the collar engaging piece deformed inward by the abutment between the hole surface of the mounting hole and the outward projecting portion of the collar engaging piece engages with the other end surface of the collar. As a result, the collar is not easily press-fitted into the bush, but is simply retained on the bush and assembled.

  By adjusting the inner diameter size of the bush and the outer diameter size of the collar, the outer periphery of the collar is loaded with a gap on the inner periphery of the bush, and the swingability of the collar after assembly can be easily ensured.

(Claim 2)
(b) Since the collar engaging piece of the bush is projected, the inward bending deformation of the collar engaging piece is facilitated, and the collar engaging piece of the above-mentioned (a) when the bush is inserted into the mounting hole. This facilitates inward deformation and improves the insertability of the bush into the mounting hole.

(Claim 3)
(c) When the bush is inserted into the mounting hole and fitted, the bushing locking portion is locked to the outer edge of the one end opening of the mounting hole on one end surface of the bush, and the bushing is In the process of inserting the attachment engagement claw into the attachment hole, the diameter is elastically reduced by abutting with the hole surface of the attachment hole, and after passing through the attachment hole, it is elastically recovered and engaged with the outer edge of the other end opening. As a result, the bushing is assembled with the collar being prevented from coming off as described above (a), and at the same time, the bushing is kept from being fitted into the mounting hole.

(Claim 4)
(d) The other end surface of the bush is formed with an annular recess on the inner peripheral side of the collar engagement piece and the mounting engagement claw, and a slit-shaped recess is formed on the side of the collar engagement piece and the mounting engagement claw in the circumferential direction. To do. Thereby, the collar engagement piece and the attachment engagement claw of the bush are provided in a protruding shape on the other end surface of the bush, and the bending deformation performance thereof can be improved.

  1 is an overall cross-sectional view showing a hydraulic tensioner, FIG. 2 is an enlarged view of the main part of FIG. 1, FIG. 3 is a front view showing the attachment joint of FIG. 1, FIG. 4 shows the attachment joint, and FIG. 4B is a cross-sectional view taken along line IV-IV, FIG. 5B is an enlarged view of the main part of FIG. 5A, FIG. 5 shows a mounting joint, FIG. 5A is a cross-sectional view showing a bush and a collar separately, and FIG. It is sectional drawing which shows the state which loaded the color to the bush.

  The hydraulic auto tensioner 10 is provided between a fixed member such as an engine block and an idle pulley, for example, in a hybrid vehicle, and presses the idle pulley against a belt stretched between a drive wheel and a driven wheel. Apply tension to the belt.

  As shown in FIGS. 1 and 2, the auto tensioner 10 includes a pressurizing portion 13 provided with a seal ring 13A (seal member) of a plunger 12 in a cylinder 11 so as to be slidable in the axial direction, and is vertically oriented. The cylinder 11 on the lower side is attached to the fixed member side, and the idle pulley is attached to the plunger 12 side on the upper side. The plunger 12 includes an attachment member 14 at the upper part in the axial direction of the central axis. The cylinder 11 is provided with a mounting member 15 at the bottom.

  The auto tensioner 10 forms in the cylinder 11 a high pressure oil chamber 16 (high pressure chamber) partitioned by the cylinder 11 and the pressurizing portion 13 of the plunger 12. The plunger 12 comprises the pressurizing portion 13 with the plunger 12 itself, and the distal end portion (lower end portion) of the plunger 12 is slightly larger in diameter than the base end portion (upper end portion). The pressurizing unit 13 is in sliding contact with the inner periphery of the cylinder 11. The plunger 12 locks the stepped end surface near the base end portion (small diameter portion) of the pressurizing portion 13 in the axial direction to a retaining ring 17 engaged with the inner periphery of the upper end opening of the cylinder 11 to restrict the extended end. When the plunger 12 is compressed, an annular gap is formed between the outer periphery of the base end part following the pressurizing part 13 of the plunger 12 and the inner circumference of the cylinder 11. This annular gap forms a part of the reservoir chamber 24 described later. It will be composed.

  The plunger 12 may have a large diameter portion that slides in contact with the inner periphery of the cylinder 11 at the maximum compression, and the retaining ring 17 provided on the inner periphery of the upper end opening of the cylinder 11 may be removed.

  The auto tensioner 10 is provided with a casing 21 that is integrally formed with a mounting member 15 that is fixed to the lower portion of the cylinder 11 by caulking or the like. The casing 21 has an upper end opened, and a flexible bellows 23 is provided between the opening 21 </ b> A of the casing 21 and the upper mounting member 14 on the plunger 12 side. The bellows 23 is provided with a thin wall portion 23C that can expand and contract in the axial direction at an intermediate portion between the lower thick wall portion 23A and the upper thick wall portion 23B, and the lower locking convex portion 23D is formed into an annular concave portion on the outer periphery of the casing 21. The upper locking projection 23E is liquid-tightly engaged with the annular groove of the upper mounting member 14 in a liquid-tight manner. The casing 21 and the bellows 23 form the outer cylinder 20. In the auto tensioner 10, a space that is sealed between the outer cylinder 20 and the outer periphery of the cylinder 11 and the plunger 12 is a reservoir chamber 24 (oil level L) (low pressure chamber), and a lower portion of the reservoir chamber 24 is an oil reservoir chamber. 24A, the upper part is a gas chamber 24B. Oil as a working fluid is loaded into the oil reservoir chamber 24 </ b> A of the high-pressure oil chamber 16 and the reservoir chamber 24. The thin portion 23C of the bellows 23 absorbs the expansion and contraction of the plunger 12.

  The outer cylinder 20 is composed of only a single bellows with upper and lower ends engaged with each of the cylinder 11 side and the plunger 12 side, and extending and contracting in the axial direction. Not required.

  In the auto tensioner 10, the plunger 12 and the upper mounting member 14 are provided with a first communication passage 30 that communicates the high-pressure oil chamber 16 and the reservoir chamber 24 (gas chamber 24B). The first communication passage 30 is provided in the plunger 12 and opens to the high-pressure oil chamber 16, and the communication hole 30B is provided in the upper mounting member 14 so as to cross communicate with the vertical hole 30A and open to the gas chamber 24B. It consists of. An orifice plate 32 having an orifice 31 (pressure-side damping force generating means) is press-fitted into the vertical hole 30 </ b> A at the distal end portion of the plunger 12.

  The auto tensioner 10 has a side portion of the upper mounting member 14 provided in the upper part of the plunger 12 in the axial direction, in other words, the upper mounting member 14 and the central axis of the plunger 12 (the upper mounting member 14 and the lower mounting member 15 of the auto tensioner 10). The electromagnetic valve 40A serving as the locking means 40 is fixedly arranged on the side portion in the direction orthogonal to the central axis connecting the two. At this time, the upper mounting member 14 includes a lateral hole portion 14 </ b> A that includes the intermediate portion of the communication hole 30 </ b> B and has a hole axis in a direction orthogonal to the central axis of the plunger 12 and opens on the side surface of the upper mounting member 14. . The solenoid valve 40A has upper and lower iron housings 41, 42, and the caulking portion 41A of the upper housing 41 is caulked and fixed to the flange portion 42A of the lower housing 42. Insert into part 14A. The front end portion 42B of the lower housing 42 is liquid-tightly inserted into the horizontal hole portion 14A via O-rings 43A and 43B provided at two positions on the outer periphery, and the horizontal hole portion is interposed between the O-ring 43A and the O-ring 43B. An annular hole portion 14B that is a part of 14A is formed.

  The solenoid valve 40A is provided with a solenoid 44 inside an upper housing 41A that is caulked and fixed to the lower housing 42, and a stainless steel pusher 45 is disposed at the center of the solenoid 44 so as to be able to reciprocate. An iron collar 46 is fixed to the base end portion by press fitting or the like. The pusher 45 is inserted from one end side of the center hole of the lower housing 42, and the tip of the pusher 45 is disposed in a valve chamber 47 that is a part of the center hole of the lower housing 42. 48 is held. The valve chamber 47 communicates with the annular hole portion 14B of the communication hole 30B through the hole 47A of the lower housing 42. On the other hand, the valve seat 49 is press-fitted into the other end side of the center hole of the lower housing 42, and the ball valve 48 contacts and separates from the seat surface where the valve hole 49 A of the valve seat 49 opens into the valve chamber 47. At this time, a coil spring (biasing means) 45A is interposed around the pusher 45 between the collar 46 and the end surface on the one end side of the lower housing 42 to open the ball valve 48 away from the valve seat 49. Energized in the direction. The communication hole 30B of the first communication path 30 is electrically connected through the valve hole 49A of the valve seat 49, the valve chamber 47 of the lower housing 42, and the hole 47A.

  The auto tensioner 10 uses the electromagnetic valve 40 </ b> A as a lock unit that operates in response to an external input signal and closes the first communication path 30. That is, in the auto tensioner 10, when it is necessary to lock the plunger 12 so as not to further compress in the middle of the compression stroke in order to prevent the belt from slipping, an input signal for locking is given to the electromagnetic wave. The pusher 45, which is energized by the valve 40A and moves thereby, closes the ball valve 48 and closes the first communication path 30. Normally, the ball valve 48 urged by the coil spring 45A is held in the opening operation position, and the first communication path 30 is opened.

  The auto tensioner 10 is provided with a second communication passage 51 communicating with the cylinder 11 between the high-pressure oil chamber 16 and the reservoir chamber 24 (oil reservoir chamber 24A), and the second communication passage 51 is closed when the plunger 12 is compressed. There is provided a check valve 52 that opens during expansion. The second communication passage 51 includes a hole 51 </ b> A provided in the valve seat 53 press-fitted into the lower end portion of the cylinder 11, and a groove 51 </ b> B provided in the casing 21 fixed to the lower portion of the cylinder 11. The check valve 52 is formed of a ball valve, is provided on the seat surface of the valve seat 53, is prevented from dropping outward by a cage-like valve stopper 54 provided around the seat surface of the valve seat 53, and the valve stopper The valve 55 is pressed against the seat surface of the valve seat 53 by the spring 55 backed up by 54, and opens and closes the seat surface.

  The auto tensioner 10 includes a spring seat 61 formed on the casing 21 inside a reservoir chamber 24 formed between the outer cylinder 20 and the cylinder 11 and the plunger 12, and a spring seat 62 supported by the upper mounting member 14 as a backup. A coil spring 63 is provided to urge the cylinder 11 and the plunger 12 in the extending direction.

  The auto tensioner 10 suppresses the increase in the air pressure in the reservoir chamber 24 and prevents the bellows 23 from being damaged without impairing the sealing performance of the bellows 23 provided between the casing 21 and the upper mounting member 14. The following configuration is provided.

  The bellows 23 has a locking convex portion 23D provided on the inner peripheral portion of the lower end of the lower large-diameter thick portion 23A as a seal portion that is liquid-tightly engaged with the annular concave portion on the outer periphery of the casing 21, The locking projection 23E provided on the inner peripheral portion of the upper end of the meat portion 23B is used as a seal portion that is engaged with the annular groove portion of the upper mounting member 14, and as a result, the upper projection member 14 (plunger 12) is coupled to the casing 21. The reservoir chamber 24 is sealed with a bellows 23 fitted to the bracket. The upper and lower thick portions 23 </ b> A and 23 </ b> B of the bellows 23 ensure airtightness and rigidity at the coupling seal portion with the casing 21 and the fitting seal portion with the upper mounting member 14. The upper end portion of the thick portion 23 </ b> B on the upper side of the bellows 23 is sandwiched between the upper mounting member 14 and the spring seat 62.

  The bellows 23 is a spring seat in which a small-diameter thin-walled portion 23C provided in an intermediate portion in the axial direction of the upper and lower thick-walled portions 23A, 23B is reduced to a small diameter so as to form a step shape with respect to the upper and lower thick-walled portions 23A, 23B. The inner diameter of the small-diameter thin-walled portion 23C is attached to the outer periphery of a cylindrical bellows guide 64 that is integrally connected to the outer peripheral side of 62 so as to allow sliding contact. The small-diameter thin portion 23C of the bellows 23 is bent toward the inward entry side of the casing 21 so as to follow the axial movement of the plunger 12 around the bellows guide 64 when the cylinder 11 and the plunger 12 of the auto tensioner 10 extend and contract. In addition, biting into the coil spring 63 is prevented by the presence of the bellows guide 64.

  In the bellows 23, the lower thick portion 23A mainly defines the gas chamber 24B, and the upper thick portion 23B partitions the exhaust chamber 24C in an annular shape and extends in the axial direction of the inner periphery of the thin portion 23C. A directional spline-groove-shaped ventilation groove 23F connects the gas chamber 24B to the exhaust chamber 24C. The air corresponding to the pressure increase in the gas chamber 24B enters the exhaust chamber 24C through the ventilation groove 23F, and is discharged from the exhaust port 25 as the pressure in the exhaust chamber 24C increases. The exhaust chamber 24C is formed by expanding the diameter of the upper thick portion 23B in the direction away from the bellows guide 64, and all the air from each ventilation groove 23F is introduced into the exhaust chamber 24C. Become. As a result, even if several ventilation grooves 23F are in close contact with the bellows guide 64 and cannot communicate with each other, air can be reliably discharged by communication with the other ventilation grooves 23F.

  There is a rise in pressure in the gas chamber 24B in a part of the cylindrical wall that is the thick wall portion 23B of the bellows 23 and divides the exhaust chamber 24C in the circumferential direction (a portion that is not a seal portion to the upper mounting member 14). An exhaust port 25 is provided to allow the air to escape from the exhaust chamber 24C to the outside via the ventilation groove 23F. The exhaust port 25 is closed by the entire circumference of a lid 26 formed integrally with the bellows 23, and the opening 25A of the exhaust port 25 is formed by a single character (or even a ten-letter) slit 25B cut out in the lid 26. A preferable value of the opening gap of the slit 25B is 1 mm to 5 mm.

  The opening 25A (slit 25B) of the exhaust port 25 is provided in a thin-walled opening forming portion 26 that is integrally formed with a part of the cylindrical wall of the thick portion 23B. That is, the lid 26 that closes the exhaust port 25 provided in a part of the thick portion 23B is made thinner than the thick portion 23B and is integrally formed with the thick portion 23B, and the lid 26 is opened as an opening forming portion. A portion 25A (slit 25B) is formed.

The auto tensioner 10 operates as follows.
(1) The auto tensioner 10 presses the idle pulley against the belt by the urging force of the coil spring 63 and applies a predetermined tension to the belt.

  (2) When the belt tension is reduced and the plunger 12 is about to be extended by the coil spring 63, the high pressure oil chamber 16 becomes negative pressure, and the check valve 52 of the second communication passage 51 is immediately opened. Is quickly supplied to the high-pressure oil chamber 16 so that the plunger 12 can be extended quickly.

  (3) When the tension of the belt increases and the plunger 12 is compressed by the belt, the check valve 52 of the second communication passage 51 is closed, and the pressure of the high-pressure oil chamber 16 is increased. The oil in the high pressure oil chamber 16 flows through the orifice 31 to the reservoir chamber 24 and generates a compression side damping force.

  (4) In the auto tensioner 10, when it is necessary to lock the compression stroke of the plunger 12 in the middle of the compression in order to prevent the belt from slipping, the solenoid valve 40 (solenoid 44) based on the input signal is pressed. The moving element 45 is operated and the ball valve 48 is closed. As a result, both the check valve 52 and the ball valve 48 are closed, and the oil in the high-pressure oil chamber 16 is confined to lock the compression stroke of the plunger 12.

  However, in the auto tensioner 10, the mounting joint 70 is provided in each of the mounting hole 71 of the upper mounting member 14 at the end of the plunger 12 and the mounting hole 72 of the lower mounting member 15 at the end of the cylinder 11. The mounting joint 70 is configured as follows. The central axes of the cylinder 11 and the plunger 12 are on a straight line connecting the centers of the mounting hole 71 and the mounting hole 72. The installation structure of the attachment joint 70 in the attachment hole 71 of the attachment member 14 and the installation structure of the attachment joint 70 in the attachment hole 72 of the attachment member 15 are the same. In this embodiment, the attachment hole 71 of the attachment member 14 is the same. Application to is described as a representative.

  As shown in FIGS. 3 and 4, the mounting joint 70 fits the bush 80 into the mounting hole 71 of the mounting member 14 and loads the collar 90 into the bush 80. The bush 80 is made of, for example, resin, and the collar 90 is made of, for example, aluminum. The bush 80 press-fitted into the mounting hole 71 of the mounting member 14 made of aluminum is easy to be molded because of resin, and a complicated shape can be easily processed. The collar 90 also has a cylindrical shape, is a simple shape that only chamfers the outer peripheral end portions 91 and 92, and is easy to process. The inner periphery of the bush 80 and the outer periphery of the collar 90 are inserted with a gap therebetween.

  The bush 80 is engaged with one end face of a flange-like attachment engaging portion 81 that engages with an outer edge of one end opening of the attachment hole 71 of the attachment member 14 and a chamfered end portion 91 of one end surface of the collar 90. Are provided with a tapered collar locking portion 82 which is reduced in diameter toward the outside in the axial direction.

  The bush 80 is provided with a thin tongue-like collar engaging piece 83 at a plurality of circumferential positions (for example, four positions) on the other end face, and an outward tension projecting in the outer diameter direction on the outer peripheral face of each collar engaging piece 83. A protruding portion 83A is provided. The collar engaging piece 83 has a protruding shape facing outward in the axial direction on the other end face of the bush 80.

  The bush 80 is also arranged adjacent to the collar engaging piece 83 in the circumferential direction as shown in FIG. 3 at a plurality of circumferential positions (for example, 8 positions) on the other end surface, and the other end opening of the mounting hole 71 of the mounting member 14. A mounting engagement claw 84 that engages with the outer edge of the portion is provided.

  At this time, on the other end surface of the bush 80, an annular recess 85 is formed on the inner peripheral side of the collar engaging piece 83 and the mounting engaging claw 84, and the side of the collar engaging piece 83 and the mounting engaging claw 84 in the circumferential direction. A slit-like recess 86 is formed in the space between the adjacent collar engaging pieces 83 and the mounting engagement claws 84 and between the adjacent mounting engagement claws 84 and the mounting engagement claws 84. In the present embodiment, the bottom surface of the annular recess 85 and the bottom surface of the slit-shaped recess 86 are flush with each other and are continuous.

  The attachment joint 70 (bush 80, collar 90) is installed in the attachment hole 71 of the attachment member 14 as follows (FIGS. 4 and 5).

  (1) The outer periphery of the collar 90 is loaded on the inner periphery of the bush 80 with a gap (FIG. 5). The collar locking portion 82 on one end surface of the bush 80 and the chamfered end portion 91 on one end surface of the collar 90 are locked (FIG. 4B).

  (2) The bush 80 of the above (1) loaded with the collar 90 is press-fitted into the mounting hole 71 of the mounting member 14. When the bush 80 is press-fitted into the attachment hole 71 from the other end surface side, the end portion of the collar engagement piece 83 is caused by the abutment between the outward projecting portion 83A of the collar engagement piece 83 and the hole surface of the attachment hole 71. The diameter of the collar engaging piece 83 is elastically reduced and deformed so as to bend inward, and the end portion of the collar engaging piece 83 is engaged with the chamfered end portion 92 of the other end surface of the collar 90 (FIG. 4A).

  Even at the end of press-fitting when the mounting locking portion 81 on one end surface of the bush 80 is locked to the outer edge of the one end opening of the mounting hole 71, the outward projecting portion 83 </ b> A of the collar engaging piece 83 is on the hole surface of the mounting hole 71. The end of the collar engaging piece 83 continues to be engaged with the chamfered end 92 of the collar 90. As a result, the collar locking portions 82 and the collar engaging pieces 83 on both end surfaces of the bush 80 are locked to the chamfered end portions 91 and 92 on both end surfaces of the collar 90, and the collar 90 is assembled to the bush 80 in a retaining state. It will be attached.

  (3) In the process of press-fitting the bush 80 of the above (2) into the mounting hole 71, the mounting engagement claw 84 on the other end surface of the bush 80 also abuts the hole surface of the mounting hole 71, It is elastically reduced in diameter so as to bend in the direction. At the end of the press-fitting of the bush 80, the attachment engagement claw 84 passes through the attachment hole 71 and is elastically restored so as to eliminate the reduced diameter deformation, and engages with the outer edge of the other end opening of the attachment hole 71 (see FIG. 4 (A)). As a result, the bush 80 is fixedly installed in the mounting hole 71 in a retaining state by engaging the mounting locking portions 81 and the mounting engaging claws 84 on both end surfaces with the outer edges of the opening portions on both ends of the mounting hole 71.

According to the present embodiment, the following operational effects can be obtained.
(a) The collar 90 is preloaded in the inner diameter of the bush 80, and the bush 80 is press-fitted into the mounting hole 71 and fitted. At one end surface of the bush 80, the collar locking portion 82 of the bush 80 is locked to one end surface of the collar 90. At the other end surface of the bush 80, the tip end portion of the collar engaging piece 83 deformed inward by the abutment between the hole surface of the mounting hole 71 and the outwardly extending portion 83A of the collar engaging piece 83 is the other end of the collar 90. Engage with the end face. As a result, the collar 90 is simply prevented from coming off and assembled to the bush 80 without being press-fitted into the bush 80. Only the bush 80 is used for press-fitting, and the number of assembly steps is reduced.

  In addition, by adjusting the inner diameter size of the bush 80 and the outer diameter size of the collar 90, the outer periphery of the collar 90 is loaded with a gap on the inner periphery of the bush 80, and the swingability of the collar 90 after assembly can be easily secured. .

  (b) Since the collar engaging piece 83 of the bush 80 has a protruding shape, the collar engaging piece 83 can be easily deformed inward and the collar engaging piece 83 when the bush 80 is press-fitted into the mounting hole 71 is formed. The above-mentioned (a) inward deformation is facilitated, and the press-fitting property of the bush 80 into the mounting hole 71 is improved.

  (c) When the bush 80 is press-fitted into the mounting hole 71 and fitted, the mounting locking portion 81 of the bush 80 is locked to the outer edge of the one end opening of the mounting hole 71 on one end surface of the bush 80. At the other end surface, the mounting engagement claw 84 of the bush 80 is elastically reduced in diameter by abutting with the hole surface of the mounting hole 71 in the press-fitting process into the mounting hole 71, and is elastically recovered after passing through the mounting hole 71. To engage with the outer edge of the other end opening. As a result, the bush 80 is assembled by preventing the collar 90 from being detached as described above (a), and at the same time, the bush 80 is retained by the mounting hole 71.

  (d) The other end surface of the bush 80 forms an annular recess 85 on the inner peripheral side of the collar engaging piece 83 and the mounting engaging claw 84, and the side of the collar engaging piece 83 and the mounting engaging claw 84 in the circumferential direction. A slit-like recess 86 is formed in Thereby, the collar engaging piece 83 and the mounting engaging claw 84 of the bush 80 are provided in a protruding shape on the other end surface of the bush 80, and the bending deformation performance thereof can be improved.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention. It is included in the present invention.

FIG. 1 is an overall sectional view showing a hydraulic tensioner. FIG. 2 is an enlarged view of a main part of FIG. FIG. 3 is a front view showing the attachment joint of FIG. 4A and 4B show a mounting joint, FIG. 4A is a cross-sectional view taken along line IV-IV in FIG. 3, and FIG. 4B is an enlarged view of a main part of FIG. FIG. 5 shows a mounting joint, (A) is a sectional view showing the bush and the collar separately, and (B) is a sectional view showing a state where the collar is loaded into the bush.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Hydraulic type auto tensioner 11 Cylinder 12 Plunger 14, 15 Mounting member 70 Mounting joint 71, 72 Mounting hole 80 Bush 81 Mounting locking part 82 Collar locking part 83 Collar engaging piece 83A Outward extending part 84 Mounting engaging claw 85 Annular recess 86 Slit recess 90 Color

Claims (4)

In the mounting structure of the hydraulic tensioner in which the plunger is slidably inserted into the cylinder, and the mounting joint is provided in the mounting hole at each end of the cylinder and the plunger.
A mounting joint is formed by fitting a bush into the mounting hole and loading a collar into the bush.
On one end surface of the bush, provided with an attachment locking portion that locks to the outer edge of the one end opening of the mounting hole, and a collar locking portion that locks to one end surface of the collar,
A collar engaging piece is provided at a plurality of positions in the circumferential direction of the other end surface of the bush, and an outer projecting portion is provided on the outer peripheral surface of the collar engaging piece,
When the bush is fitted into the mounting hole from the other end surface side, the end of the collar engaging piece is inward due to the abutment between the outwardly protruding portion of the collar engaging piece and the hole surface of the mounting hole. A mounting structure for a hydraulic tensioner, characterized in that the front end of the collar engaging piece is engaged with the other end surface of the collar.   The mounting structure for a hydraulic tensioner according to claim 1, wherein the collar engaging piece has a protruding shape that faces outward in the axial direction on the other end face of the bush.   3. The hydraulic pressure according to claim 1, further comprising a mounting engagement claw disposed adjacent to the collar engagement piece at a plurality of positions in the circumferential direction of the other end surface of the bush and engaging with an outer edge of the other end opening of the mounting hole. Type tensioner mounting structure. The other end surface of the bush forms an annular recess on the inner peripheral side of the collar engagement piece and the mounting engagement claw, and forms a slit-shaped recess on the side of the collar engagement piece and the mounting engagement claw in the circumferential direction. The mounting structure of the hydraulic tensioner according to Item 3.

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