JPH0798293B2 - Spring pin attachment / detachment method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a spring pin attaching / detaching method in which insertion / extraction work of a spring pin is easy, quick, and safe.

(Prior Art) Conventionally, when fixing two parts, a spring pin is press-fitted over each insertion hole formed through each part, and both parts are fixed by elastic expansion force of the spring pin. Is being carried out.

For example, when the shaft hole of the pulley is inserted and fixed to the shaft member, the shaft member and the pulley are each formed with an insertion hole that penetrates in the radial direction in advance, and each adhesive hole is positioned in a communicating state. After that, it is common practice to press-fit the spring pin with a hammer.

However, since the conventional spring pin insertion method uses hitting with a hammer, there are many cases in which the hand is accidentally injured and peripheral parts are damaged, deformed, or damaged. Further, not only skill is required to master the technique, but since it is manual work, there is a limit in speeding up the work regardless of skill, and it is difficult to be familiar with mechanization. Further, even when the spring pin once inserted is pulled out, there is no choice but to use a hammer, which has various inconveniences as in the case of insertion.

Further, in the case of using a hammer, a space for hitting with the hammer is required, but it is often impossible to sufficiently shake the hammer depending on the conditions around the working place.

Further, Japanese Utility Model Laid-Open No. 59-163469 discloses a non-portable spring pin press-fitting device.
A hollow cylindrical guide cylinder is erected by a support member fixed on the table, and a guide shaft portion supported in the guide cylinder so as to be movable back and forth in the axial direction is always upward by a coil spring in the guide cylinder. A guide shaft portion that is biased and projects outward from one axial end of the guide cylinder is inserted into a through hole provided in each processed material, and the tip of the guide shaft portion that projects outward from the through hole has a small diameter. The holding portion fits and supports one end of the spring pin. In this state, the other end of the spring pin is pushed down against the spring by the press-fitting means composed of an air cylinder, forcibly press-fitting.

However, since this conventional press-fitting device is a fixed type in which the guide cylinder is erected on the table, the press-fitting device can be installed depending on the surroundings (presence or absence of obstacles, presence or absence of working space, etc.) of the mounting object. It is not possible to perform press-fitting work accurately while flexibly changing various holding angles (postures). In particular, since the press-fitting device is fixed on the table, it is necessary to position the object to be mounted above the press-fitting device (hold it in a floating state) to perform the press-fitting work. It will be very limited.

Also, since the spring pin is erected by fitting one end of the spring pin to the holding part (short length) at the tip of the guide shaft part, the spring pin holding stability is unavoidable and the air pin must be kept stable. It is also possible that the spring pin may fall when pushed down by the cylinder. Especially, unless the positional relationship between the pressing portion of the air cylinder and the spring pin is accurately set, the spring pin easily falls down, so that it is obvious that this conventional device is essentially a fixed type. In addition, since the spring pin has such a structure that the spring pin is supported in an unstable state (a structure lacking a chuck), this press-fitting device can only be used in such a manner that it is erected upward on the table. Therefore, depending on the surrounding environment of the mounting object,
It is impossible to make it slightly slanted or face down. That is, it cannot be applied except when the spring pin is pushed downward in the vertical direction, and as a result, the application scene is extremely limited.

The disadvantages of this conventional example are that the guide shaft does not chuck the spring pin with sufficient force when the spring pin is press-fitted, and it is fixed on the table. It arises from the structural problem that it is applicable only when it can be pushed into.

(Object of the Invention) The present invention has been made in view of the above, and a spring pin attaching / detaching method capable of quickly and reliably and safely attaching / detaching a spring pin regardless of the conditions around the working place and regardless of skill. Is provided.

(Outline of the Invention) In order to achieve the above object, in the present invention, each component is fixed and integrated by press-fitting a spring pin into each insertion hole of a plurality of components each having an insertion hole capable of communicating with each other. In the work of converting the long pin-shaped portion of the T-shaped guide pin into the axial through hole of the spring pin,
By inserting the tip end portion of the rod-shaped portion of the guide pin from one end side of each of the insertion holes, the tip end of the rod-shaped portion that protrudes to the outside is retracted by being inserted into the other end side of the insertion hole. A large-diameter head of the guide pin is inserted into the outer insertion hole by press-fitting the spring pin, which is locked by the large-diameter head of the T-shaped guide pin, by being held by a tool. The spring pin is inserted into the insertion hole by means of, and a large-diameter portion is continuously formed integrally above the rod-shaped portion of the T-shaped guide pin in the axial direction and a small-diameter portion is formed downward in the axial direction. The stepped portion at the boundary between the small diameter portion and the small diameter portion is engaged with one end in the axial direction of the spring pin so that the spring pin is press-fitted into each of the insertion holes, and the spring pin is inserted into the insertion hole. Insert the spring pin with the stepped part of the above T-shaped guide pin. Characterized by being adapted to extrusion to Anagaibu.

(Example) Hereinafter, the spring pin attaching / detaching method of the present invention will be described in detail.

FIGS. 1 (a), (b), (c) and (d) are explanatory views of the spring pin insertion procedure by the spring pin attaching / detaching device using the method of the present invention, and the spring pin shown in FIG. 1 (d). The shaft member and the pulley can be fixed to each other by press-fitting into the insertion hole according to the procedure shown in FIGS. 1 (a), (b) and (c).

First, in the first step shown in FIG. 1 (a), the pulley 3 having the insertion hole 3a penetrating in the radial direction is formed on the outer periphery of the shaft member 4 having the insertion hole 4a penetrating in the radial direction. The shaft hole 3b is inserted, and the insertion holes 3a and 4b are positioned so that they are in communication with each other. Next, the cylindrical spring pin 2
The guide pin 1 inserted into the hole 2a penetrating in the axial direction of (Fig. 1 (d)) is inserted into each of the insertion holes 3a and 4a, and the tip of the guide pin 1 protruding on the opposite side is inserted into the drawing jig 5. Insert hole 5a
Introduce inside.

As shown in FIG. 1 (d), the spring pin 2 is a metal cylindrical body having a hole 2a penetrating in the axial direction, and the notch 2b is formed over the entire axial length of the cylindrical body. It is configured so that it can be expanded and contracted elastically in the radial direction.

The guide pin 1 has a head portion 1a and a rod portion 1b.
The rod-shaped part 1b is elongated as shown in the figure. Here, the long length means the spring pin 2 as shown in FIG. 1 (a).
When the rod-shaped portion 1b is inserted into the insertion holes 3a, 4a of each component while holding the, the tip of the rod-shaped portion not only protrudes from the other end of the insertion hole to the outside, but Case 6
It is the length that can be reached and reach the position where it can be clamped by the chuck 14. Further, it goes without saying that the head portion (head portion) 1a of the spring pin has a larger diameter than the spring pin so that one end portion in the axial direction of the spring pin can be locked and pushed. .

The retracting jig 5 includes a case 6 having a hollow interior, an air cylinder 10 located in the case 6, a rod 11 that can be inserted by the air cylinder 10, and a drive guide 12 supported by the tip of the rod 11. The chuck 14 is movably supported in the vertical direction by the tapered inner diameter portion 12a of the drive guide 12 and is constantly urged upward by the spring 13. The chuck 14 has a tapered inner diameter portion 12a.
It is composed of a plurality of block bodies 14a having a tapered outer peripheral surface shape that matches with. Each block body 14a constituting the chuck 14 is constantly urged upward by the spring 13, and as a result, when the drive guide 12 is positioned upward as shown in FIG. 1 (a), it is formed by the tapered inner diameter portion 12a. Since it is not pressed, the tip of the rod-shaped portion 1b of the guide pin 1 cannot be clamped. When the drive guide 12 is pulled down by the air cylinder 10, only the drive guide 12 is lowered downward relative to the chuck 14 as shown in FIGS. 1 (b) and (c), so that the tapered inner diameter portion 12a is used. Each block body 14a is pressed in the inner diameter direction to clamp the tip of the guide pin 1.

Next, in the second step shown in FIG. 1B, while the air cylinder 10 pulls the drive guide 12 downward, each block body 14a tries to continue to be positioned upward due to the pressing force of the spring 13. Therefore, the tapered outer peripheral surface of each block body 14a is pressed against the tapered inner diameter portion of the drive guide 12 in the inner diameter direction, and the inner peripheral surface of each block body 14a is pressed against the tip of the guide pin 1. To pinch.

Next, in the third step shown in FIG. 1C, the guide pin 1 held by the chuck 14 is forcibly lowered by further lowering the air cylinder 10.
Then, the spring pin 2 inserted into the guide pin 1 is pressed downward by the head portion 1a and fitted into the insertion holes 3a and 4a. The insertion of the spilling pin 2 is completed when the head portion 1a comes into contact with the outer peripheral surface of the pulley 3.

By using the handy type as the pull-in jig 5, the workability can be greatly improved even in a narrow space in a large number of complicated parts groups and other adverse conditions.

Next, FIG. 2 shows a second embodiment of the method of the present invention, which is different from the above embodiment in the structure in which the large diameter portion 1c is formed on the rod-shaped portion 1b of the guide pin 1. According to the insertion method using the guide pin 1, the spring pin 2 is attached to the head portion 1a.
Since the large-diameter portion 1c located below is pushed into the insertion holes 3a and 4b, a deeper pushing amount can be obtained as compared with the above-mentioned embodiment. By changing the axial length of the large diameter portion 1c, the insertion depth of the spring pin 2 can be set arbitrarily. The diameter of the large diameter portion 1c is set to be larger than the diameter of the small diameter portion 1d and smaller than that of the head portion 1a.

FIG. 3 shows a pulley 3 according to a third embodiment of the method of the present invention.
And a method of removing the spring pin 2 inserted into the respective insertion holes 3a, 4a of the shaft member 4. In this extraction method, a guide pin 1 having a large diameter portion c having an axial length reaching the diameter of the pulley 3 and a collar 20 are used. The collar 20 is arranged between the pulley 3 and the drawing jig 5 so that the through hole 20a in the axial direction communicates with each of the insertion holes 3a4a and the insertion hole 5a. Insert the guide pin 1 into each insertion hole 3a, 4a using the pull-in jig 5.
When retracted, the spring pin 2 is pressed downward by the stepped portion of the large diameter portion 1c of the guide pin 1, and most of the spring pin 2 is pushed into the collar 20. Therefore, the spring pin 2
Can be pulled out easily.

In addition, depending on the conditions, the guide pin 1 may be used by using the retracting jig 5.
In some cases, it may be difficult to pull in, but in that case, the head portion 1a of the guide pin 1 may be hit with a hammer or the like for insertion. In this case, the possibility of damaging the parts is reduced as compared with the conventional method of directly hitting the spring pin 1.

(Effects of the Invention) As described above, the method of the present invention makes it extremely easy to insert and remove a spring pin, so that even unskilled personnel can safely perform the safety work without causing damage to peripheral parts. In addition, the work can be done quickly. Also,
In the apparatus realized by the method of the present invention, the tip of the T-shaped guide pin is securely chucked by the pull-in jig and then pulled in, so that the work can be performed while the T-shaped guide pin is stably supported. This means that there is no functional problem even when the entire device is tilted or is used upside down. Further, since it can be a portable device, it can be applied regardless of the quality of the surrounding environment of the attachment target.

[Brief description of drawings]

FIGS. 1 (a), (b), (c) and (d) are explanatory views of a spring pin insertion procedure by a spring pin attaching / detaching device using the method of the present invention, and FIG. b)
Is a second step, (c) is an explanatory view showing a third step,
(D) is a structural explanatory view of a spring pin, FIG. 2 is an explanatory view of a second embodiment of the method of the present invention, and FIG. 3 is an explanatory view of a third embodiment of the method of the present invention. Reference numeral 1 ... Guide pin, 1a ... Head portion 1b ... Rod portion, 1c ... Large diameter portion 2 ... Spring pin, 2a ... Hole 2b ... Notch, 3 ... Pulley 3a ... Insertion hole, 4 ... Shaft member 4a ... Insertion hole, 5 ... Pull-in jig 5a ... Insertion hole, 6 ... Case, 10 ... Air cylinder, 11 ... Rod, 12 ... Drive guide, 12a ... Tapered inner diameter Part, 13
...... Spring, 14 …… Chuck, 14a …… Block body, 20…
…Color

Claims (3)

[Claims] 1. In a work of fixing and integrating each component by press-fitting a spring pin into each insertion hole of a plurality of components each having an insertion hole capable of communicating with each other, the axial through hole of said spring pin. After inserting a long rod-shaped portion of the T-shaped guide pin into the inside, insert the tip end portion of the rod-shaped portion of the guide pin from one end side of each of the insertion holes, thereby the other end of the insertion hole. From the side to the outside, and the tip of the bar-shaped portion protruding to the outside is sandwiched by a drawing jig and pulled in, so that the spring pin locked by the large-diameter head of the T-shaped guide pin is A spring pin attaching / detaching method characterized in that the spring pin is inserted into the insertion hole by a head portion having a large diameter of the guide pin by being press-fitted into the insertion hole. 2. The T-shaped guide pin has a rod-shaped portion having a large-diameter portion axially above and a small-diameter portion axially below and integrally formed, and the step portion at the boundary between the large-diameter portion and the small-diameter portion is integrated. The spring pin attaching / detaching method according to claim 1, wherein the spring pin is press-fitted into each of the insertion holes by engaging with one end of the spring pin in the axial direction. 3. The spring pin inserted into the insertion hole is forced out of the insertion hole by the stepped portion of the T-shaped guide pin. And the method for attaching and detaching the spring pin according to the second item.