JP2618186B2 - Assembling method of piston pin clip - Google Patents

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 one end of which is in contact with a piston pin clip of a clip groove, and another piston pin clip is inserted into the other end of the clip groove. The present invention relates to an assembling method of a piston pin clip which is assembled and finally fixed to a piston.

[0002]

2. Description of the Related Art As an apparatus for assembling a C-shaped piston pin clip into one clip groove of a piston pin insertion hole into which a piston pin is not inserted, the applicant of the present invention has previously described an apparatus 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 to be inserted into the clip groove CH by being moved to the piston pin insertion hole PH.

[0004] According to this assembling apparatus, the manual work of the worker who had previously pinched the piston pin clip C with radio pliers or the like and assembled the clip groove CH one by one was eliminated.
The 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 is performed when the piston pin PP (FIG. 3) is inserted into the piston pin insertion hole PH. Insertion hole P
H when the receiving shaft 40 is inserted through the piston pin insertion hole P
Since it escapes from H, it cannot be assembled by the above-described assembling apparatus, and still has to be performed manually by an operator.

[0006] Further, in the conventional assembling apparatus, it was not possible to know whether or not the assembling was possible. Therefore, it was necessary to visually or manually feel whether or not the assembling was performed normally.
There is a problem that it is troublesome and requires skill.

One object of the present invention is to assemble a piston pin clip into the other clip groove while a piston pin clip is assembled into one clip groove and a piston pin is inserted into a piston pin insertion hole. It is an object of the present invention to provide a piston pin clip assembling method 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 assembly is possible.

[0009]

In order to achieve the above object, a method for assembling a piston pin clip is provided.
A hollow piston pin is inserted, one end of which is inserted into a piston pin insertion hole in which the piston pin clip of one of the clip grooves abuts, and a cylindrical pusher is inserted to hold the other end of the piston pin. After the receiving shaft is inserted from one end side to the other end side of the piston pin, the pusher is pulled out from the piston pin insertion hole, and is separated into a cylindrical clip catcher fitted movably in the axial direction to the pusher. The piston pin clip is held, then the clip catcher is fitted to the receiving shaft inserted through the piston pin, the piston pin clip held by the clip catcher is fitted to the receiving shaft, and the pusher is inserted again. A configuration in which the piston pin clip inserted into the hole and fitted to the receiving shaft above is assembled into the clip groove on the other end side of the piston pin. It was.

According to a second aspect of the present invention, there is provided a method of assembling a piston pin clip according to the first aspect of the present invention, wherein a clip catcher is brought into contact with a side surface of a piston, and a pusher is inserted into a piston pin insertion hole and fitted to a receiving shaft. When the attached piston pin clip is attached to the clip groove on the other end of the piston pin, or when the receiving shaft is inserted through the piston pin, the small sleeve fitted to the receiving shaft so as to be relatively movable in the axial direction is used. When inserted into the piston pin insertion hole and brought into contact with the piston pin clip at one end of the piston pin, and when the large sleeve fitted movably in the axial direction to the small sleeve is brought into contact with the side surface of the piston, Contact member (pusher or small three) to piston pin clip against contact member (clip catcher or large sleeve) to piston side 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]

The delivery movable table is moved by the delivery actuator, a cylindrical pusher is inserted into the piston pin insertion hole to hold down the piston pin, and then the receiving movable table is moved by the receiving actuator to move the receiving shaft. Insert the piston pin. Therefore, the piston pin is not pushed by the receiving shaft during the insertion movement of the receiving shaft and does not come out of the piston pin insertion hole.

The detection sensor of the delivery device is configured such that, 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 is assembled into the clip groove, the moving distance of the pusher relative to the clip catcher. Is detected. Since the movement interval changes depending on the assembly state, it is possible to accurately determine whether or not the assembly is possible from the detection result of the detection sensor.

[0013] The detection sensor of the receiving device is arranged so that the small sleeve is brought into contact with the piston pin clip assembled in the previous step, and the moving distance of the small sleeve with respect to the large sleeve when the large sleeve is brought into contact with the side surface of the piston. Is detected. Since the movement interval at this time varies depending on the assembled state of the piston pin clip in the previous process, etc., it is possible to know whether or not the piston pin clip can be used from the detection result of the detection sensor.

[0014]

1 to 4 show an embodiment of a piston pin clip assembling apparatus according to the present invention. The piston pin clip assembling device of the present invention includes a piston pin clip delivery device 1 and a piston pin clip receiving device 2.

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

The pusher 4 is fixed to the delivery movable base 3 with its axial direction corresponding to the moving direction of the delivery movable base 3. The outer diameter of the tip (the right end in FIG. 1) of the pusher 4 is made smaller than the inner diameter of the piston pin insertion hole PH of the piston P, and is made larger than the inner diameter of the piston pin clip C in the piston pin insertion hole PH. The inner diameter is set 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 outward by the spring 12 (to the right in FIG. 1).

The outer diameter of the tip of the clip catcher 5 is larger than the inner diameter of the piston pin insertion hole PH, and the inner diameter is slightly smaller than the outer diameter of the C-shaped piston pin clip C in a free state. Clip catcher 5
When the piston pin clip C is press-fitted so that the radial direction of the piston pin clip C matches the center line of the piston pin clip C, the piston pin clip C is elastically reduced in diameter and is held in the clip catcher 5. Clip catcher 5
Is mounted with a guide rod 14 that moves along the guide 13. The guide rod 14 has a dog 15 at its free end.
Having. 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 moved in the axial direction by a moving actuator 16 such as an air cylinder. The outer diameter of the centering pin 6 is made 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 moves 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 (based on the clip catcher 5 abutting on the side surface of the piston P). In this case, the movement interval of the pusher 4 with respect to the clip catcher 5 is detected. As the detection sensor 7, an overcurrent displacement sensor or the like is used, but the specific structure and type are arbitrary.

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

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

The outer diameter of the leading end of the large sleeve 22 is larger than the inner diameter of the piston pin insertion hole PH. A guide rod 30 moving along a guide 29 is provided on the large sleeve 22.
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 based on 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 also reduced, 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, and the piston pin clip C
Is rotated concentrically with the clip catcher 5.

The detection sensor 24 is fixed to the movable receiving table 20 so as to face the dog 31. Detection sensor 2
4 is the amount of movement of the large sleeve 22 with respect 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 (based on the large sleeve 22 abutting on the side surface of the piston P). , The movement interval of the small sleeve 21 with respect to the large sleeve 22).
As with the detection sensor 7, the specific structure, type, and the like are arbitrary.

The transfer device 1 and the receiving device 2 align the central axes of the pusher 4 (clip catcher 5 and centering pin 6) and the small sleeve 21 (large sleeve 22 and receiving shaft 23), and face each other. The piston P is disposed at an interval S between the end of the pusher 4 and the end 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 receiving device 2, and supplies the piston pin clip C to the delivery device 1 raised along the rail 8. To cause the clip catcher to hold it in the state described above. Reference sign CR is a connecting rod.

Next, the method of assembling the piston pin clip according to the present invention will be described together with the operation of the assembling apparatus having the above-described structure. The piston P is usually placed on a pallet (not shown) and carried between the transfer device 1 and the receiving 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 positioned in agreement. The piston pin PP has already been inserted into the piston pin insertion hole PH of the piston P, and one end thereof is in contact with the piston pin clip C of the one clip groove CH (FIG. 3A).

When the piston P is positioned, the transfer actuator 10 is operated to move the movable table 3 toward the piston P, and the transfer actuator 16
Moves the centering pin 6 forward. Thereby, 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 to contact the piston pin PP. Then, the piston pin PP is fixed (FIG. 3 (b)).

At this time, the detection sensor 7 of the delivery device 1
The movement interval of the pusher 4 with respect to the clip catcher 5 abutting on 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 inserted into the piston pin insertion hole P.
Assuming that the movement interval in the case where the piston pin PP is inserted into the piston pin C and one end thereof is in contact with the piston pin clip C is a normal value, the piston pin PP is not inserted into the piston pin insertion hole PH, or even if it is inserted, If the object is shorter than the length, the movement interval will be larger than the above normal value,
The distance between the detection sensor 7 and the dog 15 becomes smaller than the normal value. Further, when the piston pin clip C is deformed and a part thereof protrudes inside the clip groove CH or when the piston pin PP is longer than a predetermined length, the movement interval becomes smaller than a normal value, and the detection sensor 7 and dog 1
Since the interval of No. 5 is wider than the normal value, it is possible to accurately determine whether or not assembly is possible.

When the tip of the pusher 4 comes into contact with the piston pin P to fix the piston pin PP, the moving actuator 16 retreats the centering pin 6 and the receiving device 2
The receiving actuator 27 operates to move the movable table 20 toward the piston P, and the moving actuator 32 moves the receiving shaft 23 forward. With this operation,
The distal end of the receiving shaft 23 is inserted through the piston pin PP and inserted into the pusher 4.
Of the small sleeve 21 is inserted into the piston pin insertion hole PH and abuts the piston pin clip C (FIG. 4 (c)).

At this time, the detection sensor 24 is connected to the small sleeve 21 against the large sleeve 22 in contact with the side surface of the piston P.
Detects the movement interval of. Assuming that 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 with the normal value, the piston pin clip C is not assembled in the clip groove CH. The movement interval is larger than the normal value, and the interval between the detection sensor 24 and the dog 31 is smaller than the normal value. In the case where the piston pin clip C is deformed and a part thereof protrudes outside the clip groove CH, the movement interval is smaller than the normal value, and the interval between the detection sensor 24 and the dog 31 is wider than the normal value. Therefore, it is possible to accurately determine whether or not assembly is possible.

When the receiving shaft 23 is completely inserted into the piston pin PP, the delivery actuator 10 operates in the opposite direction to retract the movable table 3, pulls out the pusher 4 from the piston pin insertion hole PH, and releases 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 transfer device 1 has been lowered, the transfer actuator 10 is operated again to move the movable table 3 forward. At this time, the piston pin clip C moves forward 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 to the receiving shaft 23 (FIG. 4 (f)). The piston pin clip C fitted to the receiving shaft 23 is immediately pushed by the pusher 4 and assembled into 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 abutting on 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 is not assembled in the clip groove CH, the movement interval becomes larger than the above-mentioned normal value, and the detection sensor 7 and the dog 15 The interval is smaller than the normal value. In the case where the piston pin clip C is deformed and a part thereof protrudes outward from the clip groove CH, the movement interval becomes smaller than a normal value, and the detection sensor 7 and the dog 1
Since the interval of 5 is wider than the normal value, in this case also, it is possible to accurately determine whether or not assembly is possible.

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

[0035]

As described above, according to the present invention having the above-described structure, the piston pin clip is assembled into one of the clip grooves and the piston pin is inserted into the piston pin insertion hole. The piston pin clip can be accurately and quickly assembled into the other clip groove without labor.

Further, when the delivery device is provided with a detection sensor, it is possible to accurately detect an abnormality in assembling in a case where the piston pin or the piston pin clip is absent or is not formed in a predetermined shape. . Further, when the receiving device is provided with a detection sensor, it is possible to accurately detect an assembling abnormality in a case where the piston pin clip which is supposed to be already assembled is not present or is deformed.

In addition, since the displacement of the pusher with respect to the clip catcher or the small sleeve with respect to the large sleeve is detected, it is possible to accurately detect whether or not the assembly is possible regardless of the positioning accuracy of the piston with the pallet. it can.

[Brief description of the drawings]

FIG. 1 is a front view showing a delivery device and a part of a receiving device which constitute a device for assembling 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 the operation of a delivery device and a receiving device.

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

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

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 delivery device 2 receiving device 3 delivery movable base 4 pusher 5 clip catcher 6 centering pin 7 detection sensor 10 delivery actuator 12 spring 15 dog 16 movement actuator 20 receiving movable base 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)

(57) [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 in one clip groove, and the other end of the piston pin is inserted. In this state, after inserting a receiving shaft from the one end side to the other end side of the piston pin in this state, pull out the pusher from the piston pin insertion hole and fit the pusher axially movably in the cylindrical shape. Then, another piston pin clip is held by the clip catcher, then the clip catcher is fitted to the receiving shaft inserted through the piston pin, and the piston pin clip held by the clip catcher is fitted to the receiving shaft, and the pusher is pushed. Into the piston pin insertion hole again, and assemble the piston pin clip fitted on the receiving shaft into the clip groove on the other end of the piston pin. A method for assembling a piston pin clip, characterized by being attached. 2. A case in which a clip catcher is brought into contact with a side surface of a piston, a pusher is inserted into a piston pin insertion hole, and a piston pin clip fitted on a receiving shaft is assembled into a clip groove on the other end side of the piston pin. Or, when the receiving shaft is inserted through the piston pin, insert the small sleeve, which is relatively movably fitted in the receiving shaft in the axial direction, into the piston pin insertion hole to contact the piston pin clip on one end of the piston pin. When the large sleeve, which is movably fitted in the small sleeve in the axial direction, is brought into contact with the side surface of the piston, the contact member (clip catcher or large sleeve) on the side surface of the piston makes contact with the piston pin clip. A set of piston pin clips at the other end or one end of the piston pin based on the movement distance of the contact member (pusher or small sleeve) 2. The method for assembling a piston pin clip according to claim 1, wherein whether or not the attachment state is detected is detected.