JP4065263B2 - Knock pin press-fitting device and knock pin press-fitting method for piston ring detent - Google Patents

Description

  The present invention provides a knock pin press-fitting device for press-fitting a knock pin inserted in a piston ring groove of a piston peripheral wall into a pin hole provided in the piston peripheral wall to prevent the piston ring from rotating in the piston ring groove. The present invention relates to a knock pin press-fitting method for press-fitting a knock pin into a pin hole provided in a peripheral wall of a piston using an apparatus.

  3 and 4, a plurality of piston ring grooves 14 are engraved on the circumferential wall of the piston 10 used in the internal combustion engine so as to be vertically arranged. The piston ring grooves 14 include a combustion chamber. Piston rings 15 are fitted to prevent gas leakage from the inside (not shown) and prevent oil supplied inside the cylinder (not shown) from entering the combustion chamber. In an internal combustion engine such as a motorcycle, it is necessary to prevent the piston ring 15 fitted in the piston ring groove 14 from rotating in the piston ring groove 14 because of its structure.

  As shown in FIGS. 5 and 6, the piston ring detent mechanism for preventing the piston ring 15 from rotating in the piston ring groove 14 is generally provided with a knock pin 17 in a pin hole 16 provided in the peripheral wall of the piston 10 as shown in FIGS. Is inserted, and a partial side wall of the head portion of the knock pin 17 projects from the side wall of the piston ring groove 14 to the inside of the piston ring groove 14. Then, a part of the side wall of the head portion of the knock pin 17 projecting inside the piston ring groove 14 is fitted and locked inside an arc-shaped notch 152 provided at the divided end of the piston ring 15. The piston ring 15 is prevented from rotating in the piston ring groove 14 by a knock pin 17.

  A conventional knock pin press-fitting device for press-fitting a knock pin 17 of this piston ring detent mechanism into a pin hole 16 provided in the peripheral wall of the piston 10 is generally a piston provided in the piston 10 as shown in FIG. With the positioning hole 33 passing through the piston hole 19 through which a pin (not shown) is inserted, the piston hole 19 is used as a reference so that the piston 10 does not move toward a predetermined position on the table 21 in a predetermined direction. The fixing means 31 for fixing to the inner surface of the piston 10 and the knock pin 17 disposed in the outer space of the piston 10 fixed on the table 21 by the fixing means to open the pin hole 16 in the peripheral wall of the piston from the inside of the pin feed hole (not shown). It is composed of a pin press-fitting means 51 and the like that push out toward the portion and press-fit the knock pin 17 into the pin hole 16. In the state where the piston 10 is fixed to a predetermined position on the table 21 in a predetermined direction by the fixing means 31, the pin press-fitting means 51 is configured so that the shaft center 53 of the knock pin supplied into the pin feed hole for pushing out the knock pin 17 is It is arranged in a predetermined position in a predetermined position in the outer space of the piston 10 fixed on the table 21 by the fixing means 31 so as to coincide with the axial center 18 of the pin hole provided in the ten peripheral wall.

According to this conventional knock pin press-fitting device, as shown in FIG. 7, the positioning arm 33 is passed through the piston hole 19 of the piston peripheral wall, and the piston hole 19 is used as a reference, and the piston 10 is fixed to the fixing means 31. Thus, it can be fixed to a predetermined position on the table 21 so as not to move in a predetermined direction. Then, an axial center 53 of the knock pin supplied in the pin delivery hole of the pin press-fitting means 51 and arranged in a predetermined direction at a predetermined position in the outer space of the piston 10 fixed on the table 21 by the fixing means 31. Further, it can be made to be in a state of being aligned with the axial center 18 of the pin hole provided in the peripheral wall of the piston 10.
Thereafter, using the pin press-fitting means 51, the knock pin 17 is pushed out from the pin feed hole of the pin press-fitting means 51 toward the opening of the pin hole 16 in the piston peripheral wall, and the knock pin 17 is fixed on the table 21 by the fixing means 31. Can be press-fitted into the pin hole 16 of the piston peripheral wall.
JP 2002-243039 A

  However, when the knock pin 17 is press-fitted into the pin hole 16 of the piston peripheral wall using the conventional knock pin press-fitting device, the knock pin 17 is displaced obliquely laterally from the pin hole 16 of the piston peripheral wall, and the pin hole There were frequent accidents that were forced into No. 16. And the notch etc. which were scratched with the knock pin 17 on the peripheral wall of the pin hole 16 of the piston peripheral wall frequently occurred. And the expensive piston 10 was made defective.

Therefore, the present inventor has sought the cause, and since the piston 10 is manufactured with errors of various sizes, the positioning arm 33 is passed through the piston hole 19 of the piston having such errors. In the mechanical positioning method in which the piston 10 is fixed to a predetermined position on the table 21 by the fixing means 31 in a predetermined direction with the piston hole 19 as a reference, the fixing means 31 fixes the piston 10 on the table 21. A shaft 53 of a knock pin supplied into a pin feed hole of the pin press-fitting means 51 arranged in a predetermined direction in a predetermined position in the outer space of the piston 10 fixed to the piston 10 is fixed to a predetermined position on the table 21 by the fixing means 31. Because it cannot always be in a state of being accurately aligned with the axis 18 of the pin hole of the piston peripheral wall fixed in a predetermined direction. That there was discovery.
In order to solve such a problem, the peripheral wall portion of the piston 10 provided with the pin hole 16 of the piston is photographed by a CCD camera (abbreviation of a digital camera using a charge coupled device), and the CCD camera It was conceived that accurate position and direction data of the axial center 18 of the pin hole on the piston peripheral wall may be obtained directly from the photographed image. Then, based on the accurate position and direction data of the pin hole axis 18 of the piston peripheral wall acquired using the CCD camera, the pin hole axis 18 of the piston peripheral wall is placed in the pin feed-out hole of the pin press-fitting means 51. The inventors have conceived that it is only necessary to match the axial center 53 of the supplied knock pin. And if it does so, even if the piston 10 has various errors in size and the position of the pin hole 16 of the piston peripheral wall is deviated from the normal position, the piston peripheral wall is not affected by it. It has been conceived that the axial center 18 of the pin hole can always be accurately aligned with the axial center 53 of the knock pin supplied in the pin delivery hole of the pin press-fitting means 51.
Then, based on the accurate position and direction data of the pin hole axis 18 of the piston peripheral wall acquired from the photographed image taken by such a CCD camera, the pin hole axis 18 of the piston peripheral wall is inserted into the pin press-fitting means 51. A knock pin press-fitting device that can accurately press-fit the knock pin 17 pushed out from the pin feed hole into the pin hole 16 of the piston peripheral wall, accurately matching the axial center 53 of the knock pin fed into the pin feed hole Developed a knock pin press-fitting method using

  That is, according to the present invention, based on the position and direction data of the axial center of the pin hole on the piston peripheral wall acquired from the photographed image taken by the CCD camera, the axial center of the pin hole on the piston peripheral wall is moved into the pin feed hole of the pin press-fitting means. A knock pin press-fitting device, which can accurately match the axial center of the knock pin supplied to the pin, and can always press-fit the knock pin pushed out from the pin feed hole into the pin hole of the piston peripheral wall, and a knock pin press-in method using the device The purpose is to provide.

In order to achieve the above object, the knock pin press-fitting device for preventing rotation of the piston ring according to the present invention is to press-fit a knock pin for preventing the piston ring from rotating in the piston ring groove into a pin hole provided in the piston peripheral wall. The knock pin press-fitting device of
A turntable for mounting a piston, and a fixing for fixing the piston at a predetermined position on the turntable in a predetermined direction with the axis of the piston mounted on the turntable aligned with the axis of the turntable Means, rotating means for rotating the turntable about its axis, elevating means for raising and lowering the turntable in its axial direction, and a predetermined position in a space outside the piston fixed on the turntable With the axial center of the knock pin arranged in the direction aligned with the axial center of the pin hole of the piston peripheral wall fixed on the turntable, the knock pin is directed from the inside of the pin feed hole toward the opening of the pin hole. A pin press-fitting means for pushing out and press-fitting the knock pin into the pin hole, and a pin for supplying the knock pin into the pin feed-out hole of the pin press-fitting means Supply means, support means for supporting the piston peripheral wall portion fixed on the turntable opposite to the pin feed hole side for pushing out the knock pin, and a predetermined position in the outer space of the piston fixed on the turntable. The shaft center of the photographing lens is shifted from the shaft center of the knock pin supplied into the pin feed-out hole of the pin press-fitting means by a certain angle θ around the shaft center of the turntable, A CCD camera that is arranged toward the axial center of the piston fixed on the table and photographs the piston peripheral wall portion provided with the pin hole, and a piston peripheral wall portion provided with the pin hole photographed by the CCD camera. Image analysis means for analyzing the image and obtaining the position and direction data of the axial center of the pin hole of the piston peripheral wall, and obtained by the image analysis means Based on the position and direction data of the axial center of the pin hole of the piston peripheral wall, the turn means rotates the turntable around the axis by a predetermined angle, and the elevating means moves the turntable up and down in the axial direction by a predetermined distance. In a state where the axis of the photographing lens of the CCD camera is shifted from the axis of the turntable by a fixed angle θ, the direction is directed to a predetermined position in the outer space of the piston fixed on the turntable. And a control means for aligning the axis of the knock pin supplied into the pin feed hole of the pin press-fitting means arranged with the axis of the pin hole of the piston peripheral wall fixed on the turntable. Yes.

The knock pin press-fitting method for preventing rotation of the piston ring according to the present invention is a knock pin press-fitting method using the knock pin press-fitting device of the present invention, and includes the following steps a to f.
a. A piston is mounted on the turntable, and the piston is directed to a predetermined position on the turntable in a predetermined direction with the fixing means being used so that the axis of the piston is aligned with the axis of the turntable. Step to fix.
b. The outer space of the piston fixed on the turntable by rotating the turntable by an arbitrary angle around its axis by the rotating means, or raising and lowering the turntable by an arbitrary distance in the axial direction by the elevating means. A piston peripheral wall portion provided with a pin hole for press-fitting a knock pin is positioned on or near the axial center of the photographing lens of the CCD camera arranged at a predetermined position of the CCD camera, and the piston peripheral wall portion provided with the pin hole is positioned at the CCD camera. Step to shoot by.
c. Analyzing the image of the piston peripheral wall portion provided with the pin hole photographed by the CCD camera using the image analysis means, and obtaining the position and direction data of the axial center of the pin hole of the piston peripheral wall;
d. Supplying a knock pin into a pin delivery hole of the pin press-fitting means using the pin supply means;
e. Based on the position and direction data of the axial center of the pin hole of the piston peripheral wall obtained by the image analyzing means using the control means, the rotating means rotates the turntable around the axial center by a predetermined angle, The turntable is fixed on the turntable in such a state that the turntable is moved up and down by a predetermined distance in the axial direction by a means and is shifted from the axial center of the photographing lens of the CCD camera by a certain angle θ around the axial center of the turntable. The axis of the knock pin supplied in the pin feed hole of the pin press-fitting means arranged in the predetermined position in the outer space of the piston is directed to the axis of the pin hole of the piston peripheral wall fixed on the turntable Step to match.
f. While the piston peripheral wall portion fixed on the turntable opposite to the pin feed hole side for pushing out the knock pin is supported by the support means, the knock pin supplied into the pin feed hole is pinned using the pin press-fitting means. A step of pushing out from the delivery hole toward the opening of the pin hole and press-fitting the knock pin into the pin hole.

In the knock pin press-fitting method using the knock pin press-fitting device, in step a, the piston is mounted in a standing state on the turn table, and the piston is mounted on the turn table by using a fixing means. Can be fixed at a predetermined position on the turntable in a predetermined direction.
Next, in step b, the turn table is fixed on the turn table by rotating the turn table around the axis by an arbitrary angle or by raising / lowering the turn table by an elevating means by an arbitrary distance. A piston peripheral wall portion provided with a pin hole for press-fitting a knock pin can be positioned on or near the axial center of the photographing lens of the CCD camera arranged at a predetermined position in the outer space of the piston. Then, the photographing lens of the CCD camera is directed to the piston peripheral wall portion provided with the pin hole, and the piston peripheral wall portion provided with the pin hole can be photographed by the CCD camera.
Next, in step c, the image analysis means is used to analyze the image of the piston peripheral wall portion provided with the pin hole photographed by the CCD camera, and the position and direction data of the axial center of the pin hole of the piston peripheral wall Can be obtained with reference to the position and direction data of the axial center of the photographing lens of the CCD camera arranged in a predetermined direction at a predetermined position in the outer space of the piston fixed on the turntable. In that case, the pin hole of the piston peripheral wall fixed on the turntable is photographed by the CCD camera, and the image of the piston peripheral wall portion provided with the pin hole photographed by the CCD camera is analyzed by the image analysis means. Therefore, since the position and direction data of the axial center of the pin hole of the piston peripheral wall fixed on the turntable is directly acquired, the piston mounted and fixed on the turntable is large or small. Even if there are various errors or the position of the pin hole on the piston peripheral wall deviates from the normal position, the axis of the pin hole on the piston peripheral wall fixed on the turntable is not affected by it. The position and orientation data can always be obtained accurately.
At the same time, in step d, the knock pin can be supplied into the pin delivery hole of the pin press-fitting means using the pin supply means.
Next, in step e, based on the accurate position and direction data of the axial center of the pin hole of the piston peripheral wall acquired by the image analyzing means using the control means, the turn table is predetermined around the axial center by the rotating means. The turntable is rotated by a certain angle θ around the axis of the turntable from the axis of the taking lens of the CCD camera by rotating the angle or raising and lowering the turntable by a predetermined distance in the axial direction by the elevating means. The axial center of the knock pin supplied in the pin feed hole of the pin press-fitting means arranged in a predetermined direction at a predetermined position in the outer space of the piston fixed on the table is connected to the piston peripheral wall fixed on the turntable. It can always match the pin hole axis accurately.
Thereafter, in step f, using the pin press-fitting means, the knock pin supplied into the pin feed hole is pushed out from the pin feed hole toward the opening of the pin hole on the piston peripheral wall, and the knock pin can be press-fitted into the pin hole. At that time, in step e, as described above, the axial center of the knock pin supplied into the pin delivery hole of the pin press-fitting means is always in a state accurately aligned with the axial center of the pin hole of the piston peripheral wall. In addition, the knock pin pushed out from the pin feed hole of the pin press-fitting means can be always press-fitted accurately without causing eccentricity or the like in the pin hole of the piston peripheral wall. In that case, in order to continue supporting the piston peripheral wall portion fixed on the turntable opposite to the pin feed hole side for pushing out the knock pin by the support means, the piston fixed on the turntable is It can be prevented that the pin is pushed by the knock pin and falls to the side opposite to the portion provided with the pin hole into which the knock pin is press-fitted.

  In the knock pin press-fitting device of the present invention, the pin press-fitting means directs the knock pin toward the opening of the pin hole in a state where the axis of the knock pin is aligned with the pin hole of the piston peripheral wall fixed on the turntable. A guide cylinder having a pin feed hole to be pushed out, and a pin pushing means for pushing the knock pin supplied into the pin feed hole of the guide cylinder from the pin feed hole toward the opening of the pin hole and press-fitting the knock pin into the pin hole It is preferable to consist of

In such a case, in step e of the pin press-fitting method of the present invention, using the control means, based on the accurate position and direction data of the axial center of the pin hole of the piston peripheral wall obtained by the image analysis means, the rotation means The turntable is rotated by a predetermined angle around its axis, or the turntable is moved up and down by a predetermined distance in the direction of its axis by lifting means, and the axis of the CCD camera's taking lens is centered on the axis of the turntable. The shaft center of the knock pin supplied in the pin feed hole of the guide cylinder of the pin press-fitting means arranged in a predetermined direction in a predetermined position in the outer space of the piston fixed on the turntable in a state shifted by a certain angle θ. The axial center of the pin hole of the piston peripheral wall fixed on the turntable can always be accurately aligned.
Thereafter, in step f of the pin press-fitting method of the present invention, while the piston peripheral wall portion fixed on the turntable opposite to the pin feed hole side for pushing out the knock pin is supported by the support means, the pin push-out of the pin press-fitting means The knock pin supplied in the pin feed hole of the guide cylinder is pushed out from the pin feed hole toward the opening of the pin hole in the piston peripheral wall fixed on the turntable, and the knock pin is press-fitted into the pin hole. it can.

According to the knock pin press-fitting method of the present invention using the knock pin press-fitting device of the present invention, the piston mounted on the turntable and fixed by the fixing means has various errors in size, or the pin hole of the piston peripheral wall Even if the position deviates from the normal position, the position and direction data of the axial center of the pin hole of the piston peripheral wall fixed on the turntable can always be accurately obtained without being affected by it. Then, based on the accurate position and direction data of the axial center of the pin hole, the control means is used to rotate the turntable by a predetermined angle around the axial center by the rotating means, or the turntable is rotated to the axial center by the lifting means. It can be moved up and down a predetermined distance in the direction. And the shaft center of the knock pin supplied in the pin feed hole of the pin press-fitting means arranged in a predetermined direction at a predetermined position in the outer space of the piston fixed on the turntable is fixed on the turntable. In addition, it can always coincide with the axial center of the pin hole of the piston peripheral wall accurately. Then, the knock pin is pushed out from the pin feed hole of the pin press-fitting means toward the opening of the pin hole, and the knock pin can be always press-fitted accurately without causing eccentricity or the like to the pin hole of the piston peripheral wall.
As a result, the knock pin is displaced from the pin hole of the piston peripheral wall obliquely in the lateral direction etc. and is press-fitted into the pin hole, so that it is ensured that a notch or the like scratched by the knock pin on the pin hole peripheral wall of the piston peripheral wall occurs. Can be prevented. And the accident which makes an expensive piston a defective article can be prevented reliably.

Next, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show a preferred embodiment of a knock pin press-fitting device of the present invention, FIG. 1 is a front view thereof, and FIG. 2 is a plan view thereof. Hereinafter, the knock pin press-fitting device will be described.

As shown in FIG. 3, the knock pin press-fitting device is provided with a knock pin 17 that prevents the piston ring 15 fitted in the piston ring groove 14 of the piston 10 circumferential wall from rotating in the piston ring groove 14 on the piston 10 circumferential wall. This is a knock pin press-fitting device for press-fitting into the provided pin hole 16.
As shown in FIG. 4, the pin hole 16 of the piston ring detent mechanism is provided over the side wall of the piston ring groove 14 and the inside of the piston ring groove 14. It faces in the direction perpendicular to the axis 12 of. As shown in FIG. 6, the pin hole 16 has a knock pin 17 in a state where its top is buried inside the piston 10 rather than the outer peripheral surface of the piston 10, and a part of the side wall of the head is a piston ring groove. 14 is press-fitted in a state of projecting into the piston ring groove 14 from the side wall.
For example, as shown in FIG. 6, the knock pin 17 has a columnar shape with a tapered tip. A groove 172 is cut vertically in the outer wall of the knock pin 17, and when the knock pin 17 is press-fitted into the pin hole 16 of the piston peripheral wall having a blind hole shape, the knock pin 17 is press-fitted through the groove 172. The air inside the pin hole 16 is discharged to the outside of the pin hole 16.

The knock pin press-fitting device shown in FIGS. 1 and 2 is configured so that a disc-shaped turntable 20 on which a piston 10 is erected in the Z direction is rotatable about an axis 22 facing the Z direction, and , And can be moved up and down in the direction of the axis 22 facing the Z direction. Specifically, the turntable 20 is supported on the upper end of the rotary shaft 24 facing the Z direction so as to be rotatable and freely movable up and down. Then, the upper surface of the turntable 20 on which the piston 10 is mounted faces the XY direction perpendicular to the Z direction.
Further, as shown in FIG. 1, the piston 10 is placed at a predetermined position on the turntable 20 in a predetermined direction with the axial center 12 of the piston mounted on the turntable 20 aligned with the axial center 22 of the turntable. The fixing means 30 which fixes toward is provided. The fixing means 30 is configured such that a positioning block 32 projecting on the turntable 20 is inserted into a space inside the piston 10 mounted on the turntable 20, and a part of a circumferential wall of the positioning block 32 is provided inside the piston 10. The piston 10 is brought into contact with a predetermined position on the turntable 20 in a predetermined direction by abutting against a stepped portion or a projection (not shown) or by pressing the head of the piston 10 toward the turntable 20 by the pressing block 34. The structure is fixed toward
Further, a rotating means 40 for rotating the turntable 20 around its axis 22 is provided. The rotating means 40 has a structure in which a servo motor (not shown) that rotates the rotating shaft 24 that supports the turntable 20 in the forward and reverse directions is a drive source.
In addition, an elevating means 42 for elevating and lowering the turntable 20 in the direction of the axis 22 is provided. The elevating means 42 has a structure in which a servo motor (not shown) for elevating the rotating shaft 24 that supports the turntable 20 is used as a drive source.
Further, as shown in FIG. 1, the knock pin shaft center 64 is aligned with the shaft center 18 of the pin hole of the piston peripheral wall fixed in a predetermined direction at a predetermined position on the turntable 20 by the fixing means 30. Thus, a pin press-in means 50 is provided for pressing the knock pin 17 from the pin feed hole 62 toward the opening of the pin hole 16 and press-fitting the knock pin 17 into the pin hole 16.
The pin press-fitting means 50 is a pin hole provided in the peripheral wall portion of the piston 10 fixed on the turntable 20 by the fixing means 30 by rotating the turntable 20 by the rotating means 40 or moving up and down by the lifting means 42. The outer space of the piston 10 fixed on the turntable 20 by the fixing means 30 so that the shaft center 18 can coincide with the shaft center 64 of the knock pin supplied into the pin delivery hole 62 of the pin press-fitting means 50. Are arranged in a predetermined direction at predetermined positions.
As shown in FIG. 1, the pin press-fitting means 50 is supplied into a guide cylinder 60 having a pin delivery hole 62 for pushing out the knock pin 17 toward the opening of the pin hole 16 and the pin delivery hole 62 of the guide cylinder. Further, the knock pin 17 is pushed out from the pin feed hole 62 toward the opening of the pin hole 16 around the piston fixed on the turntable 20, and the knock pin 17 is constituted by pin pushing means 80 for press-fitting the pin pin 16 into the pin hole 16. is doing. The pin pushing means 80 includes an air cylinder 84 having a piston rod 82 that pushes the rear end of the knock pin 17 and pushes the knock pin 17 outward from the feed hole 62 of the guide cylinder.
Moreover, as shown in FIG. 1, the pin supply means 70 which supplies the knock pin 17 in the delivery hole 62 of the guide cylinder of the pin press-fit means 50 is provided. The pin supply means 70 includes a vibration type part feeder 74 that feeds the knock pins 17 one by one through the chute 72 into the feed hole 62 of the guide cylinder.
Moreover, as shown in FIG. 1, the support means 90 which supports the piston 10 surrounding wall part fixed on the turntable 20 on the opposite side to the pin feed hole 62 side which pushes out the knock pin 17 is provided. The support means 90 includes an abutment block 92 that abuts against the circumferential wall of the piston 10, an air cylinder 96 having a piston rod 94 attached to the tip of the block, and the like. Then, a contact block 92 mounted at the tip of the piston rod 94 of the air cylinder is brought into contact with the piston 10 peripheral wall, and the piston 10 peripheral wall is supported by the contact block 92.
In addition, as shown in FIG. 2, a CCD camera 100 is provided for photographing the peripheral wall portion of the piston 10 in which the pin hole 16 is provided. The CCD camera 100 is a knock pin for supplying the axial center 102 of the photographing lens into the pin feed-out hole 62 of the pin press-fitting means 50 at a predetermined position in the outer space of the piston 10 fixed on the turntable 20 by the fixing means 30. The axial center 12 of the piston on which the photographing lens 104 is fixed on the turntable 20 is shifted from the axial center 64 by a fixed angle θ (90 degrees in FIG. 2) about the axial center 22 of the turntable. It is arranged in the direction. Specifically, the axis of the knock pin supplied to the axial center 102 of the photographing lens of the CCD camera and the pin delivery hole 62 of the pin press-fitting means 50 on the same plane that faces the XY direction perpendicular to the Z direction. The center angle 64 of the CCD camera and the center axis 64 of the knock pin supplied into the pin feed hole 62 are constant around the axis 22 of the turntable. The CCD camera 100 is arranged at a predetermined position in the outer space of the piston 10 fixed on the turntable 20 by the fixing means 30 so that the angle θ is obtained.
Further, as shown in FIG. 2, the image of the peripheral wall portion of the piston 10 provided with the pin hole 16 photographed by the CCD camera 100 is analyzed, and the position and direction data of the axis 18 of the pin hole in the peripheral wall of the piston are obtained. The image analysis means 110 to acquire is provided. The image analysis means 110 is constituted by an electronic circuit of a computer 112 provided with a display.
Further, based on the position and direction data of the axial center 18 of the pin hole of the piston peripheral wall acquired by the image analyzing means 110, the rotating means 40 rotates the turntable 20 around the axial center 22 by a predetermined angle, or by the elevating means 42. The turntable 20 is moved up and down by a predetermined distance in the direction of the axis 22 so that the turntable 20 is shifted on the turntable 20 from the axis 102 of the photographing lens of the CCD camera by a predetermined angle θ around the axis 22 of the turntable. An axial center 64 of the knock pin supplied into the pin feed hole 62 of the pin press-fitting means 50 arranged in a predetermined direction at a predetermined position in the outer space of the fixed piston 10 is fixed on the turntable 20. Control means 120 is provided to match the axis 18 of the pin hole on the piston peripheral wall. The control means 120 is configured using an electronic control circuit of the computer 112 or the like.

The knock pin press-fitting device shown in FIGS. 1 and 2 is configured as described above.
Next, a preferred embodiment of the knock pin press-fitting method for rotating the piston ring according to the present invention using the knock pin press-fitting device will be described.

In this knock pin press-fitting method, in step a, the piston 10 is mounted on the turntable 20 in a state of being raised in the Z direction, and the piston 10 is mounted on the piston shaft 12 using the fixing means 30. It is fixed in a predetermined direction at a predetermined position on the turntable 20 in a state where it is aligned with the axis 22 facing the Z direction of the turntable.
Next, in step b, the turn table 20 is rotated forward and backward around the axis 22 facing the Z direction by the rotating means 40, or the turn table 20 is moved in the direction of the axis 22 facing the Z direction by the lifting means 50. A pin hole 16 for press-fitting the knock pin 17 on or near the axial center 102 of the photographing lens of the CCD camera disposed at a predetermined position in the outer space of the piston 10 fixed on the turntable 20 is moved up and down. The provided piston 10 circumferential wall portion is positioned. Then, the peripheral wall portion of the piston 10 provided with the pin hole 16 is photographed by the CCD camera 100.
Next, in step c, the image analysis means 110 is used to analyze the image of the peripheral wall portion of the piston 10 provided with the pin hole 16 photographed by the CCD camera 100, and the axis 18 of the pin hole on the peripheral wall of the piston. The position and direction data are acquired. Specifically, the peripheral wall portion of the piston 10 provided with the pin hole 16 is projected in a predetermined area frame (not shown) displayed on the display of the image analysis means 110, and the Z of the axis 18 of the pin hole is shown. The height position data in the direction and the tilt angle data of the pin hole axis 18 with respect to the X direction or the Y direction are set in a predetermined direction in a predetermined position in the outer space of the piston 10 fixed on the turntable 20. Using the electronic circuit of the computer 112 or the like, the position and direction data of the axial center 102 of the photographing lens of the CCD camera arranged toward the camera is used as a reference.
At the same time, in step d, the knock pin 17 is supplied into the pin delivery hole 62 of the pin press-fitting means 50 using the pin supply means 70.
Next, in step e, using the computer 112 of the control means 120 or the like, based on the position and direction data of the axis 18 of the pin hole of the piston peripheral wall obtained by the image analysis means 110, the turn table 20 is rotated by the rotation means 40. Is rotated by a predetermined angle around the axis 22 facing the Z direction, or the turntable 20 is moved up and down by a predetermined distance in the direction of the axis 22 facing the Z direction. Then, in a state where it is shifted from the axial center 102 of the photographing lens of the CCD camera by a certain angle θ about the axial center 22 of the turntable, it is directed in a predetermined direction to a predetermined position in the outer space of the piston 10 fixed on the turntable 20. The shaft center 64 of the knock pin supplied from the parts feeder 74 or the like by the pin supply means 70 is inserted into the pin feed hole 62 of the pin press-fitting means 50 arranged in the above manner, and the pin hole of the piston peripheral wall fixed on the turntable 20 It is aligned with the axis 18.
Thereafter, in step f, the knock pin 17 supplied into the feed hole 62 of the guide cylinder is fixed on the turntable 20 from the feed hole 62 of the guide cylinder by using the pin pushing means 80 of the pin press-fitting means 50. The knock pin 17 is pressed into the pin hole 16 by being pushed out toward the opening of the pin hole 16 in the peripheral wall of the piston. In that case, the contact block 92 of the support means 90 is brought into contact with the piston 10 peripheral wall portion fixed on the turntable 20 on the side opposite to the pin feed hole 62 side for pushing out the knock pin 17, and the piston 10 peripheral wall The part is supported by the support means 90. The piston 10 fixed on the turntable 20 is pushed by the knock pin 17 to prevent the piston 10 from falling to the side opposite to the portion where the pin hole 16 for press-fitting the knock pin 17 is provided.

  The knock pin press-fitting method using the knock pin press-fitting device comprises the above steps a to f. In this knock pin press-fitting method, the fixing means 30 fixes the predetermined position on the turntable 20 in a predetermined direction. The piston 10 peripheral wall portion provided with the piston pin hole 16 is photographed by the CCD camera 100, and the piston 10 peripheral wall provided with the piston pin hole 16 fixed on the turntable 20 photographed by the CCD camera 100 is captured. A method of analyzing a partial image by the image analysis means 110 is adopted. And the method of acquiring directly the position and direction data of the axial center 18 of the pin hole of the piston surrounding wall fixed on the turntable 20 is employ | adopted. Therefore, even if the piston 10 mounted and fixed on the turntable 20 has various errors in size or the position of the pin hole 16 on the piston peripheral wall is shifted from the normal position, The position and direction data of the axis 18 of the pin hole of the peripheral wall of the piston fixed on the turntable 20 can be always accurately obtained using the CCD camera 100 and the image analysis means 110 without being affected. Then, based on the accurate position and direction data of the axial center 18 of the pin hole on the piston peripheral wall obtained by the CCD camera 100 and the image analysis means 110, the rotation means 40 is used to turn the turntable 20 on its axis using the control means 120. The turntable 20 can be rotated by a predetermined angle around the core 22, or the turntable 20 can be moved up and down by a predetermined distance in the direction of the axis 22. Then, in a state where it is shifted from the axis 102 of the photographing lens of the CCD camera by a certain angle θ about the axis 22 of the turntable, it is directed to a predetermined position in a space outside the piston 10 fixed on the turntable 20. The axial center 64 of the knock pin supplied by the pin supply means 70 in the pin delivery hole 62 of the pin press-fitting means 50 arranged in the above manner is precisely aligned with the axial center 18 of the pin hole of the piston peripheral wall fixed on the turntable 20. Can match. Then, the knock pin 17 can be pushed out from the pin feed hole 62 of the pin press-fitting means 50 toward the opening of the pin hole 16 in the piston peripheral wall, and the knock pin 17 can be always press-fitted accurately without causing eccentricity or the like. . Then, the knock pin 17 is displaced from the pin hole 16 of the piston peripheral wall in an oblique lateral direction or the like and is press-fitted into the pin hole 16, and a notch or the like scratched by the knock pin 17 on the pin hole 16 peripheral wall of the piston is generated. Can be surely prevented.

  Two or more piston ring grooves 14 are provided side by side on the piston 10 circumferential wall, and a plurality of pin holes 16 for inserting knock pins 17 corresponding to the number of the piston ring grooves 14 are provided on the piston 10 circumferential wall. These are provided by using the same drilling device (not shown) at exactly the predetermined angle with respect to the center axis 12 of the shaft 12 so as to be accurately shifted by a predetermined height. Therefore, if the position and direction data of the axis 18 of any one of the plurality of pin holes 16 are acquired using the CCD camera 100 and the image analysis means 110, one pin is obtained. From the position and direction data of the hole axis 18, almost accurate position and direction data of the other pin hole axes 18 can be estimated. Based on the estimated position and direction data, the control means 120 is used to accurately align the axis 18 of the other pin hole with the axis 64 of the knock pin supplied into the pin delivery hole 62 of the pin press-fitting means 50. Can match. Therefore, in the knock pin press-fitting method using the knock pin press-fitting device, in general, the position and direction data of the axis 18 of all the pin holes provided in the peripheral wall of the piston 10 are imaged with the CCD camera 100. It is not necessary to acquire using the analysis means 110. However, in order to always be able to press-fit the dowel pins 17 into all of the plurality of pin holes 16 provided on the peripheral wall of the piston 10 without eccentricity or the like, the positions of the shaft centers 18 of all the plurality of pin holes and Of course, the direction data may be acquired using the CCD camera 100 and the image analysis means 110.

  The knock pin press-fitting method of the present invention using the knock pin press-fitting device of the present invention prevents the piston ring fitted in the piston ring groove formed on the piston peripheral wall used in the internal combustion engine from rotating in the piston ring groove. It can be widely used effectively when, for example, a knock pin used in a mechanism for press-fitting into a pin hole provided in a piston peripheral wall.

It is a front view of the knock pin press-fitting device of the present invention. It is a top view of the knock pin press-fitting device of the present invention. It is a front view of a piston in a state where a piston ring is fitted in a piston ring groove. It is a front view of a piston. It is an enlarged front view of the piston surrounding wall part provided with the pin hole. FIG. 6 is a cross-sectional view taken along the line AA in FIG. 5. It is a top view of the conventional knock pin press-fitting device.

Explanation of symbols

10 piston 12 piston axis 14 piston ring groove 15 piston ring 16 pin hole 17 knock pin 18 pin hole axis 19 piston hole 20 turntable 22 turntable axis 30 fixing means 40 rotating means 42 lifting means 50 pin press fitting means 60 Guide cylinder 62 Pin feed hole 64 Knock pin axis 70 Pin supply means 80 Pin push means 90 Support means 100 CCD camera 102 Lens axis 110 Image analysis means 120 Control means

Claims (3)

A knock pin press-fitting device for press-fitting a knock pin that prevents the piston ring from rotating in a piston ring groove into a pin hole provided in a piston peripheral wall,
A turntable for mounting a piston, and a fixing for fixing the piston at a predetermined position on the turntable in a predetermined direction with the axis of the piston mounted on the turntable aligned with the axis of the turntable Means, rotating means for rotating the turntable about its axis, elevating means for raising and lowering the turntable in its axial direction, and a predetermined position in a space outside the piston fixed on the turntable With the axial center of the knock pin arranged in the direction aligned with the axial center of the pin hole of the piston peripheral wall fixed on the turntable, the knock pin is directed from the inside of the pin feed hole toward the opening of the pin hole. A pin press-fitting means for pushing out and press-fitting the knock pin into the pin hole, and a pin for supplying the knock pin into the pin feed-out hole of the pin press-fitting means Supply means, support means for supporting the piston peripheral wall portion fixed on the turntable opposite to the pin feed hole side for pushing out the knock pin, and a predetermined position in the outer space of the piston fixed on the turntable. The shaft center of the photographing lens is shifted from the shaft center of the knock pin supplied into the pin feed-out hole of the pin press-fitting means by a certain angle θ around the shaft center of the turntable, A CCD camera that is arranged toward the axial center of the piston fixed on the table and photographs the piston peripheral wall portion provided with the pin hole, and a piston peripheral wall portion provided with the pin hole photographed by the CCD camera. Image analysis means for analyzing the image and obtaining the position and direction data of the axial center of the pin hole of the piston peripheral wall, and obtained by the image analysis means Based on the position and direction data of the axial center of the pin hole of the piston peripheral wall, the turn means rotates the turntable around the axis by a predetermined angle, and the elevating means moves the turntable up and down in the axial direction by a predetermined distance. In a state where the axis of the photographing lens of the CCD camera is shifted from the axis of the turntable by a fixed angle θ, the direction is directed to a predetermined position in the outer space of the piston fixed on the turntable. And a control means for aligning the axis of the knock pin supplied into the pin feed hole of the pin press-fitting means arranged with the axis of the pin hole of the piston peripheral wall fixed on the turntable. A knock pin press-fitting device for rotating the piston ring.   The pin press-fitting means has a pin feed-out hole that pushes the knock pin toward the opening of the pin hole in a state where the axis of the knock pin is aligned with the axis of the pin hole of the piston peripheral wall fixed on the turntable. A guide cylinder and a pin pushing means for pushing out the knock pin supplied into the pin feed hole of the guide cylinder from the pin feed hole toward the opening of the pin hole and press-fitting the knock pin into the pin hole. The knock pin press-fitting device for piston ring detent according to claim 1. A knock pin press-fitting method using the knock pin press-fitting device according to claim 1, wherein the method includes the following steps.
a. A piston is mounted on the turntable, and the piston is directed to a predetermined position on the turntable in a predetermined direction with the fixing means being used so that the axis of the piston is aligned with the axis of the turntable. Step to fix.
b. The outer space of the piston fixed on the turntable by rotating the turntable by an arbitrary angle around its axis by the rotating means, or raising and lowering the turntable by an arbitrary distance in the axial direction by the elevating means. A piston peripheral wall portion provided with a pin hole for press-fitting a knock pin is positioned on or near the axial center of the photographing lens of the CCD camera arranged at a predetermined position of the CCD camera, and the piston peripheral wall portion provided with the pin hole is positioned at the CCD camera. Step to shoot by.
c. Analyzing the image of the piston peripheral wall portion provided with the pin hole photographed by the CCD camera using the image analysis means, and obtaining the position and direction data of the axial center of the pin hole of the piston peripheral wall;
d. Supplying a knock pin into a pin delivery hole of the pin press-fitting means using the pin supply means;
e. Based on the position and direction data of the axial center of the pin hole of the piston peripheral wall acquired by the image analyzing means using the control means, the rotating means rotates the turntable around the axis by a predetermined angle, or the lifting means The turntable is fixed on the turntable in a state where the turntable is moved up and down by a predetermined distance in the axial direction, and is shifted from the axial center of the CCD camera photographing lens by a certain angle θ around the axial center of the turntable. The axis of the knock pin supplied in the pin feed hole of the pin press-fitting means arranged in a predetermined direction at a predetermined position in the outer space of the piston is made the axis of the pin hole of the piston peripheral wall fixed on the turntable. Step to match.
f. While the piston peripheral wall portion fixed on the turntable opposite to the pin feed hole side for pushing out the knock pin is supported by the support means, the knock pin supplied into the pin feed hole is pinned using the pin press-fitting means. A step of pushing out from the delivery hole toward the opening of the pin hole and press-fitting the knock pin into the pin hole.

Images