JPH0768432A - Assembling method for piston-pin clip - Google Patents

Abstract

PURPOSE:To prevent a piston-pin from slipping off to assemble a second piston- pin clip. CONSTITUTION:A pusher 4 is allowed to abut on a piston-pin PP, and a receiving shaft 23 is passed through the piston-pin and inserted into the pusher 4. A clip catcher 5 and the pusher 4 are separated from a piston P, a piston-pin clip C is held in the clip catcher 5, and the clip catcher 5 and the pusher 4 are brought close to the piston P. The piston-pin clip C is pressed on the inclined plane 23a of the receiving shaft 23 to be turned and fitted onto the receiving shaft 23. The pusher 4 pushes the piston-pin clip C to assemble it in a clip groove CH.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piston pin which is inserted into a piston pin insertion hole and has one end abutted against a piston pin clip in a clip groove, and another piston pin clip in the clip groove on the other end side. The present invention relates to a method of assembling a piston pin clip that is assembled and finally fixed to a piston.

[0002]

2. Description of the Related Art As a device for assembling a C-shaped piston pin clip into one clip groove of a piston pin insertion hole in which a piston pin is not inserted, the applicant of the present invention previously proposed the device shown in FIG. Developed (Japanese Patent Laid-Open No. 2-24
No. 028).

The main part of this device is a clip catcher 42 fitted to a cylindrical pusher 41 at the tip of a receiving shaft 40 inserted into a piston pin insertion hole PH of a piston P.
And the piston pin clip C held inside the clip catcher 42 is fitted to the tip of the receiving shaft 40 (see (a) and (b)), and the pusher 41 is attached to the clip catcher 42 and the receiving shaft 40. The piston pin clip C is pushed by the pusher 41 so as to be assembled in the clip groove CH by moving the piston pin clip hole C into the piston pin insertion hole PH.

According to this assembling apparatus, the manual work of the worker, who has been assembling the piston pin clip C with the radio pliers or the like in the clip groove CH until then, is abolished.
Assembly work can be performed efficiently after labor saving.

[0005]

However, assembling of the piston pin clip C into the other clip groove CH of the piston P requires that the piston pin PP (FIG. 3) is inserted into the piston pin insertion hole PH. Insertion hole P
Piston pin insertion hole P when inserting the receiving shaft 40 into H
Since it comes out of H, it cannot be assembled with the above-mentioned assembling apparatus, and it is still necessary to manually perform it by the worker.

Further, in the conventional assembling apparatus, since it is not possible to know whether or not the assembling is possible, it is necessary to visually confirm whether or not the assembling is normally done by hand,
There is a problem that it takes time and requires skill.

One object of the present invention is to install the piston pin clip in the other clip groove while the piston pin clip is installed in the one clip groove and the piston pin is inserted in the piston pin insertion hole. It is to provide a method of assembling a piston pin clip that can be performed.

Another object of the present invention is to provide a method of assembling a piston pin clip, which can accurately determine whether or not the assembly is possible.

[0009]

In order to achieve the above-mentioned object, a method for assembling a piston pin clip according to claim 1 includes:
Insert a cylindrical pusher into the piston pin insertion hole where a hollow piston pin is inserted and one end of which is abutted against the piston pin clip of one clip groove, and press the other end of the piston pin in this state. After inserting the receiving shaft from the one end side to the other end side of the piston pin, pull out the pusher from the piston pin insertion hole and separate it into a tubular clip catcher fitted axially movably into the pusher. Hold the piston pin clip, then fit the clip catcher on the receiving shaft inserted through the piston pin, fit the piston pin clip held by the clip catcher on the receiving shaft, and insert the pusher again. A structure in which the piston pin clip inserted into the hole and fitted to the receiving shaft is assembled in the clip groove on the other end side of the piston pin. It was.

According to a second aspect of the present invention, in the method of assembling the piston pin clip according to the first aspect, the clip catcher is brought into contact with the side surface of the piston, and the pusher is inserted into the piston pin insertion hole to fit the receiving shaft. When the attached piston pin clip is assembled in the clip groove on the other end side of the piston pin, or when the receiving shaft is inserted into the piston pin, a small sleeve that is fitted in the receiving shaft so as to be relatively movable in the axial direction is attached. When inserting into the piston pin insertion hole and contacting the piston pin clip on one end side of the piston pin, and contacting the large sleeve axially movably fitted to the small sleeve with the side surface of the piston, Abutting member (pusher or small three) to piston pin clip against abutting member (clip catcher or large sleeve) on the piston side surface Whether the movement distance of the assembled state of the piston pin clip at the other end or one side of the piston pin) and configured to detect.

[0011]

[Function] The delivery movable table is moved by the delivery actuator, the cylindrical pusher is inserted into the piston pin insertion hole to press the piston pin, and then the receiving actuator is moved to move the receiving table to move the receiving shaft. Insert the piston pin. Therefore, when the receiving shaft is inserted and moved, the piston pin is not pushed by the receiving shaft and does not come out of the piston pin insertion hole.

The detection sensor of the delivery device is such that when the clip catcher is brought into contact with the side surface of the piston and the pusher is inserted into the piston pin insertion hole to assemble the piston pin clip into the clip groove, the movement interval of the pusher with respect to the clip catcher. To detect. Since the moving interval changes depending on the assembling state, whether or not the assembling can be accurately known from the detection result of the detection sensor.

The detection sensor of the receiving device causes the small sleeve to contact the piston pin clip assembled in the previous step, and the movement distance of the small sleeve relative to the large sleeve when the large sleeve contacts the side surface of the piston. To detect. Since the movement interval at this time varies depending on the assembly state of the piston pin clip in the previous process and the like, it is possible to know whether or not it is possible from the detection result of the detection sensor.

[0014]

1 to 4 show an embodiment of an assembly device for a piston pin clip according to the present invention. The piston pin clip assembling device of the present invention comprises a piston pin clip delivering device 1 and a piston pin clip receiving device 2.

The delivery device 1 includes a delivery movable table 3, a cylindrical pusher 4, and a cylindrical clip catcher 5.
Mainly includes a centering pin 6 that is inserted into the pusher 4 so as to be movable in the axial direction, and a detection sensor 7. The delivery movable table 3 is movably attached to a substrate 9 that moves up and down along a rail 8, and is moved left and right in FIG. 1 by a delivery actuator 10 such as an air cylinder.

The pusher 4 is fixed to the transfer movable table 3 with its axial direction aligned with the moving direction of the transfer movable table 3. The outer diameter of the tip of the pusher 4 (the right end in FIG. 1) is made smaller than the inner diameter of the piston pin insertion hole PH of the piston P and larger than the inner diameter of the piston pin clip C in the piston pin insertion hole PH, Further, the inner diameter is made substantially equal to the inner diameter of the hollow piston pin PP.
The clip catcher 5 is fitted to the tip of the pusher 4 so as to be movable in the axial direction, and is urged by the spring 12 toward the outside (right side in FIG. 1) of the tip of the pusher 4.

The outer diameter of the tip of the clip catcher 5 is made larger than the inner diameter of the piston pin insertion hole PH, and the inner diameter is made slightly smaller than the outer diameter of the C-shaped piston pin clip C in the free state. Clip catcher 5
When the radial direction of the piston pin clip C is aligned with the center line of the piston pin clip C and the piston pin clip C is press-fitted, the piston pin clip C elastically contracts and is held in the clip catcher 5. Clip catcher 5
A guide rod 14 that moves along the guide 13 is attached to the. The guide rod 14 has a dog 15 at its free end.
Have. The dog 15 can adjust its position.

The centering pin 6 has a circular cross section and is movably inserted into the clip catcher 5, and is axially moved by a moving actuator 16 such as an air cylinder. The outer diameter of the centering pin 6 is smaller than the inner diameter of the piston pin PP and can be inserted into the piston pin PP.

The detection sensor 7 is fixed to the movable base 3 so as to face the dog 15. The detection sensor 7 has a moving distance of the clip catcher 5 with respect to the pusher 4 from the position of the dog 15 that moves together with the clip catcher 5 via the guide rod 14 (with the clip catcher 5 abutting against the side surface of the piston P as a reference). In this case, the movement interval of the pusher 4 with respect to the clip catcher 5) is detected. An overcurrent displacement sensor or the like is used as the detection sensor 7, but the specific structure, type, etc. are arbitrary.

Further, the receiving device 2 includes the receiving movable base 2
0, a small cylindrical sleeve 21, a large cylindrical sleeve 22, a receiving shaft 23, and a detection sensor 24 are main components. The receiving movable base 20 is movably attached to a substrate 26 that moves up and down along a rail 25, and is moved left and right in FIGS. 1 and 2 by a receiving actuator 27 such as an air cylinder.

The small sleeve 21 is fixed to the receiving movable base 20 with its axial direction aligned with the moving direction of the receiving movable base 20. The outer diameter of the tip of the small sleeve 21 (the left end in FIGS. 1 and 2) is smaller than the inner diameter of the piston pin insertion hole PH, and the inner diameter is substantially equal to the inner diameter of the piston pin PP. The large sleeve 22 is axially movably fitted to the tip of the small sleeve 21 and is urged by a spring 28 toward the outside of the tip of the small sleeve 21 (to the left in FIG. 2).

The outer diameter of the tip of the large sleeve 22 is larger than the inner diameter of the piston pin insertion hole PH. The large sleeve 22 has a guide rod 30 that moves along a guide 29.
Is attached. This guide rod 30 also has a dog 31 at its free end. The dog 31 can also adjust its position.

The receiving shaft 23 has a circular cross section and is movably inserted into the small sleeve 21, and is moved in the axial direction by a moving actuator 32 such as an air cylinder. The outer diameter of the receiving shaft 23 is defined by the inner diameter of the piston pin PP, the inner diameter of the piston pin clip C held in the clip catcher 5, the inner diameter of the piston pin clip C in the piston pin insertion hole PH, and the inner diameter of the pusher 4. Is smaller and can be inserted into the piston pin PP and the piston pin clip C. The tip of the receiving shaft 23 is an inclined surface 23a. The inclined surface 23a pushes one side of the piston pin clip C to move the piston pin clip C.
The piston pin clip C is rotated so that the pin is concentric with the clip catcher 5.

The detection sensor 24 is fixed to the receiving movable base 20 so as to face the dog 31. Detection sensor 2
4 is the amount of movement of the large sleeve 22 relative to the small sleeve 21 from the position of the dog 31 that moves together with the large sleeve 22 via the guide rod 30 (when the large sleeve 22 abutting on the side surface of the piston P is used as a reference). , The moving distance of the small sleeve 21 with respect to the large sleeve 22),
Similar to the detection sensor 7, its specific structure, type, etc. are arbitrary.

The delivery device 1 and the delivery device 2 are arranged such that the pusher 4 (the clip catcher 5 and the centering pin 6) and the small sleeve 21 (the large sleeve 22 and the receiving shaft 23) have their central axes aligned with each other and face each other. The installation interval S of the piston P is provided between the tip of the pushed pusher 4 and the tip of the small sleeve 21. A supply device (not shown) for the piston pin clip C is provided above the delivery device 1 and the delivery device 2, and supplies the piston pin clip C to the delivery device 1 raised along the rail 8. The clip catcher to hold it in the previously described state. Reference symbol CR is a connecting rod.

Next, the method for assembling the piston pin clip of the present invention will be described together with the operation of the assembling apparatus having the above-mentioned configuration. The piston P is usually placed on a pallet (not shown) and carried between the delivery device 1 and the delivery device 2, and the center of the piston pin insertion hole PH is aligned with the center axis of the clip catcher 5 and the small sleeve 21. It is aligned and positioned. The piston pin PP is already inserted into the piston pin insertion hole PH of the piston P, and one end of the piston pin PP is in contact with the piston pin clip C of the one clip groove CH ((a) of FIG. 3).

When the piston P is positioned, the delivery actuator 10 operates to move the movable table 3 forward toward the piston P, and the movement actuator 16
Moves the centering pin 6 forward. As a result, the centering pin 6 is inserted into the piston pin PP, the clip catcher 5 contacts the side surface of the piston P, and the tip of the pusher 4 is inserted into the piston pin insertion hole PH and contacts the piston pin PP. , Fix the piston pin PP ((b) of FIG. 3).

At this time, the detection sensor 7 of the delivery device 1 is
The movement interval of the pusher 4 with respect to the clip catcher 5 contacting the side surface of the piston P is detected. The piston pin clip C is correctly assembled in the clip groove PH, and the piston pin PP having a normal length is provided in the piston pin insertion hole P.
When the movement interval when the piston pin PP is inserted into the H pin and one end of the piston pin clip C is in contact with the piston pin clip C is a normal value, the piston pin PP is not inserted in the piston pin insertion hole PH, or even if it is inserted, a predetermined value is obtained. If the object is shorter than the length of, the movement interval will be larger than the above normal value,
The distance between the detection sensor 7 and the dog 15 is narrower than the normal value. Further, when the piston pin clip C is deformed and a part of it protrudes inside the clip groove CH, or when the piston pin PP is longer than a predetermined length, the movement interval becomes smaller than the normal value and the detection sensor 7 and dog 1
Since the interval of 5 is wider than the normal value, it is possible to accurately know whether or not the assembly is possible.

When the tip of the pusher 4 contacts the piston pin P and fixes the piston pin PP, the moving actuator 16 retracts the centering pin 6 and the receiving device 2
The receiving actuator 27 operates to move the movable table 20 forward toward the piston P, and the moving actuator 32 moves the receiving shaft 23 forward. With this operation,
The tip end of the receiving shaft 23 is inserted into the pusher 4 through the piston pin PP, and the large sleeve 22 is connected to the piston P.
While abutting on the other side surface, the tip of the small sleeve 21 is inserted into the piston pin insertion hole PH and abuts on the piston pin clip C ((c) of FIG. 4).

At this time, the detection sensor 24 is arranged so that the small sleeve 21 is in contact with the large sleeve 22 which is in contact with the side surface of the piston P.
Detects the movement interval of. When the movement interval when the piston pin clip C is correctly assembled in the clip groove CH and one end of the piston pin PP is in contact is a normal value, the piston pin clip C is not assembled in the clip groove CH. The movement interval becomes larger than the above normal value, and the distance between the detection sensor 24 and the dog 31 becomes smaller than the normal value. When the piston pin clip C is deformed and a part of the piston pin clip C protrudes outside the clip groove CH, the moving distance becomes smaller than the normal value, and the distance between the detection sensor 24 and the dog 31 becomes wider than the normal value. Therefore, it is possible to accurately know whether the assembly is possible or not.

When the receiving shaft 23 is completely inserted into the piston pin PP, the delivery actuator 10 operates in the opposite manner to retract the movable table 3 so that the pusher 4 is pulled out from the piston pin insertion hole PH and the clip catcher. 5 is separated from the piston P. When this is completed, the delivery device 1 rises along the rail 8, receives the supply of the piston pin clip C, holds it in the clip catcher 5, and descends to the original position as described above (see FIG. 4). (d)).

When the delivery device 1 finishes descending, the delivery actuator 10 operates again to move the movable table 3 forward. At this time, the piston pin clip C advances together with the clip catcher 5, is pushed by the inclined surface 23a of the receiving shaft 23, and rotates counterclockwise as shown by the arrow in FIG.
It is fitted on the receiving shaft 23 ((f) of FIG. 4). The piston pin clip C fitted to the receiving shaft 23 is immediately pushed by the pusher 4 and assembled in the clip groove CH (see FIG. 4).
(g)).

Also at this time, the detection sensor 7 of the delivery device 1 detects the movement interval of the pusher 4 with respect to the clip catcher 5 which is in contact with the side surface of the piston P. At this time, the movement interval when the normal piston pin clip C is correctly assembled in the clip groove CH by the pusher 4 is set to a normal value. When the piston pin clip C is not held by the clip catcher 5 for some reason, and therefore is not assembled in the clip groove CH, the moving distance becomes larger than the above-mentioned normal value, and the detection sensor 7 and the dog 15 move. The interval becomes narrower than the normal value. Further, when the piston pin clip C is deformed and a part of the piston pin clip C projects outward from the clip groove CH, the movement interval becomes smaller than the normal value, and the detection sensor 7 and the dog 1
Since the interval of 5 is wider than the normal value, it is possible to accurately know whether or not the assembly is possible also in this case.

When the piston pin clip C is assembled in the clip groove CH by the pusher 4, both movable bases 3,
20 returns to the original state and prepares for the next assembly.

[0035]

As described above, since the present invention is configured as described above, in the state where the piston pin clip is assembled in one clip groove and the piston pin is inserted in the piston pin insertion hole, The piston pin clip can be accurately and promptly assembled in the other clip groove without bothering manpower.

Further, when the delivery device is provided with a detection sensor, it is possible to accurately detect an assembly error when there is no piston pin or piston pin clip or when the delivery device does not have a predetermined shape. . Further, when the receiving device is provided with the detection sensor, it is possible to accurately detect the assembly abnormality when there is no piston pin clip which should have already been assembled or when the piston pin clip is deformed.

Moreover, since the amount of movement of the pusher with respect to the clip catcher or the movement of the small sleeve with respect to the large sleeve is detected, whether or not the piston can be assembled can be accurately detected regardless of the positioning accuracy of the piston by the pallet. it can.

[Brief description of drawings]

FIG. 1 is a front view showing a part of a delivery device and a delivery device which constitute an assembly device of a piston pin clip according to the present invention.

FIG. 2 is a front view of a receiving device in which a small sleeve and a large sleeve are partially broken.

FIG. 3 is a cross-sectional view illustrating an operation of a delivery device and a delivery device.

FIG. 4 is a cross-sectional view illustrating an operation in another process of the delivery device and the delivery device.

FIG. 5 is a cross-sectional view illustrating the operation of a conventional piston pin clip assembling device.

[Explanation of symbols]

 1 delivery device 2 receiving device 3 delivery movable table 4 pusher 5 clip catcher 6 centering pin 7 detection sensor 10 delivery actuator 12 spring 15 dog 16 moving actuator 20 delivery movable table 21 small sleeve 22 large sleeve 23 receiving shaft 23a Inclined surface 24 Detection sensor 27 Receiving actuator 28 Spring 31 Dog 32 Moving actuator C Piston pin clip CH clip groove P Piston PH Piston pin insertion hole PP Piston pin S Installation interval

Claims (2)

[Claims] 1. A cylindrical pusher is inserted into a piston pin insertion hole in which a hollow piston pin is inserted and one end of which is in contact with a piston pin clip of one clip groove, and the other end of the piston pin is inserted. After pressing, in this state, the receiving shaft is inserted from the one end side to the other end side of the piston pin, and then the pusher is pulled out from the piston pin insertion hole to be fitted into the pusher so as to be axially movable. The other clip pin to the clip catcher, and then fit the clip catcher to the receiving shaft inserted in the piston pin to fit the piston pin clip held in the clip catcher to the receiving shaft and pusher. Again into the piston pin insertion hole, and assemble the piston pin clip fitted on the receiving shaft above into the clip groove on the other end side of the piston pin. Assembling method of piston pin clip, which is characterized by mounting. 2. When the clip catcher is brought into contact with the side surface of the piston, the pusher is inserted into the piston pin insertion hole, and the piston pin clip fitted to the receiving shaft is assembled in the clip groove on the other end side of the piston pin. , Or when inserting the receiving shaft into the piston pin, insert a small sleeve that is fitted into the receiving shaft so that it can move relatively in the axial direction, and then insert it into the piston pin insertion hole to contact the piston pin clip on one end side of the piston pin. When the large sleeve, which is brought into contact with the small sleeve and is axially movably fitted to the side surface of the piston, is brought into contact with the side surface of the piston, the piston pin clip to the contact member (clip catcher or large sleeve) on the piston side surface A set of piston pin clips on the other end side or one end side of the piston pin from the movement distance of the contact member (pusher or small sleeve) The method for assembling the piston pin clip according to claim 1, wherein the presence or absence of the mounted state is detected.