JP2015190617A - Assembly method for piston pin clip and assembly device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a damage of a pin hole caused by an end part of a piston pin clip.SOLUTION: This invention relates to assembly method for a piston pin clip for use in installing a substantial C-shaped piston clip 15 having a cleavage 15A at a clip groove of a piston 1 formed with a clip groove 11 and a side relief groove 12 at a piston hole 10. The method comprises the steps of arranging the piston pin clip coaxially with the pin hole and the cleavage part corresponds to the side relief groove; and flexing the piston pin clip in a radial inward direction, inserting the piston pin clip into the pin hole in such a way that both ends forming the cleavage of the piston pin clip may pass through the position corresponding to the side relief groove, and moving it to the clip groove.

Description

  The present invention relates to a piston pin clip assembling method and an assembling apparatus.

  A piston of a reciprocating internal combustion engine is coupled to a connecting rod by inserting a piston pin into pin holes of a pair of pin boss portions and rotatably supporting a small end portion of the connecting rod on the piston pin. The piston pin inserted into the pin hole is prevented from coming off by a piston pin clip attached to the inner wall of the pin hole. The piston pin clip is a C-shaped flexible member having a cleaving portion at a part in the circumferential direction, and is fitted into an annular clip groove extending in the circumferential direction on the inner wall of the pin hole. To fit the piston pin clip into the clip groove, the piston pin clip is elastically deformed radially inward to reduce the outer shape, and the piston pin clip is inserted into the pin hole in that state, and the piston is restored using the restoring force. This is done by engaging the pin clip with the clip groove.

  As an assembling device for fitting the piston pin clip into the clip groove, the width gradually decreases from the first end to the second end, the second end has a guide hole having a width smaller than the inner diameter of the pin hole, One having a guide member arranged so that two ends are continuous with the pin hole, and a pressing device that pushes the piston pin clip arranged in the guide hole to the pin hole side and moves it to the clip groove in the pin hole. There is (for example, Patent Document 1). In this assembling apparatus, the piston pin clip is disposed in the guide hole and moves toward the second end when pressed by the pressing device. In the process of moving toward the second end, the piston pin clip slides on the inner wall of the guide hole, and is pressed by the inner wall of the guide hole to reduce the diameter, so that the outer shape can enter the pin hole. And in the pin hole, it slides on the inner wall of the pin hole and reaches the clip groove while keeping the outer shape constant.

JP-A-9-57548

  When the assembling apparatus and the assembling method as described above are used, the piston pin clip that has entered the pin hole slides on the inner wall of the pin hole until reaching the clip groove. Therefore, both ends constituting the cleavage portion of the piston pin clip come into contact with the inner wall of the pin hole, and there is a possibility that scratches, dents, etc. are formed on the inner wall of the pin hole. If a scratch is formed on the inner wall of the pin hole, when the piston pin clip is pulled out from the clip groove, both ends of the piston pin clip may be caught by the scratch and it may be difficult to pull out. In addition, when the piston pin is pulled out, there is a risk that the scratch will be enlarged due to the piston pin being caught by the scratch, and when the piston pin is inserted again into the pin hole, the scratch burr (small edge) There is a possibility that the piston pin is caught between the outer peripheral surface and the inner peripheral surface of the pin hole, and the sliding of the piston pin with respect to the pin hole may be hindered. In addition, when the piston pin clip is delivered as a unit attached to the piston, the pin hole quality requirements may not be met.

  This invention makes it a subject to prevent damage to the pin hole resulting from the edge part of a piston pin clip in the assembly method and assembly apparatus of a piston pin clip in view of the above background.

  In order to solve the above problems, the present invention provides a pair of pin boss portions (3) and a pin hole (10) into which the piston pin (9) is inserted so as to be coaxial with each other. And an annular clip groove (11) extending in the circumferential direction on the inner wall of the pin hole, and extending across the clip groove along the axis of the pin hole on the inner wall of the pin hole, A substantially C-shaped piston pin clip (15) having a cleaving portion (15A) in a part in the circumferential direction in the clip groove of the piston (1) having a side relief groove (12) opened at the opening end of the hole. Mounting the piston pin clip for mounting the piston pin clip so that the piston pin clip is coaxial with the pin hole and the cleavage portion corresponds to the side relief groove; The piston pin clip is bent inward in the radial direction, and the piston pin clip is inserted into the pin hole so that both ends forming the cleavage portion of the piston pin clip pass through positions corresponding to the side relief grooves. Inserting and moving to the clip groove.

  According to this configuration, when the piston pin clip is inserted into the pin hole, both end portions of the piston pin clip pass through portions corresponding to the side relief grooves. Since the side relief groove is recessed radially outward with respect to the inner wall of the pin hole, the piston pin clip has its outer peripheral portion abutting against the inner wall of the pin hole, so that both end portions thereof have side relief grooves. It passes through a position away from the wall surface. Therefore, contact between both ends of the piston pin clip and the inner wall of the pin hole (including the wall surface constituting the side relief groove) is avoided, and damage such as scratches and dents caused by both ends of the piston pin clip is suppressed. .

  Another aspect of the present invention includes a pair of pin boss portions (3), a pin hole (10) into which the pin boss portions are coaxially formed and into which a piston pin (9) is inserted, and the pin An annular clip groove (11) extending in the circumferential direction on the inner wall of the hole, and extending across the clip groove along the axis of the pin hole on the inner wall of the pin hole, the open end of the pin hole Piston pin for mounting a substantially C-shaped piston pin clip (15) having a cleaving portion (15A) in a part in the circumferential direction in the clip groove of the piston having a side relief groove (12) opened in A clip assembling device (30) having a guide hole (73) whose width gradually decreases from the first end to the second end and having an inner diameter equal to or smaller than the inner diameter of the pin hole at the second end. The second And a guide member (57) arranged so as to be continuous with the pin hole, and the piston pin clip so that the cleavage portion of the piston pin clip corresponds to the side relief groove when viewed from the axial direction of the pin hole. Clip supply device (56) for supplying the guide hole to the guide hole, and the piston pin clip disposed in the guide hole is pushed toward the pin hole side, and the clip in the pin hole is pushed. And a pressing device (58) for moving to the groove.

  According to this configuration, the clip supply device supplies the piston pin clip to the guide hole so that the cleavage portion of the piston pin clip and the side relief groove correspond to each other when viewed from the axial direction of the pin hole, and the pressing device is the piston. In order to push the pin clip into the pin hole, when the piston pin clip is inserted into the pin hole, both end portions of the piston pin clip pass through portions corresponding to the side relief grooves. Therefore, contact between both ends of the piston pin clip and the inner wall of the pin hole (including the wall surface constituting the side relief groove) is avoided, and damage such as scratches and dents caused by both ends of the piston pin clip is suppressed. .

  In the above invention, the clip supply device has a column portion (65A) extending vertically and a rib (65B) extending vertically on the outer surface of the column portion, and the column portion is located inside the piston pin clip. And a clip holding member (65) for defining the direction of the piston pin clip by being disposed between both ends of the piston pin clip forming the cleavage portion, and the clip holding member The piston pin clip is provided so as to be displaceable between a forward position and a backward position below, and drops from the lower end of the column portion at the backward position, and in the state where the direction of the piston pin clip is maintained, It is good to have a clip insertion member (68) which inserts the piston pin clip in the guide hole.

  According to this configuration, the direction of the piston pin clip (the direction in which both ends are arranged) is determined by the clip holding member, and the piston pin clip is supplied to the guide hole while the clip insertion member maintains the direction of the piston pin clip. To do. Thereby, since the direction of the piston pin clip supplied to the guide groove becomes constant, it becomes easy to correspond to the side relief groove of the pin hole.

  In the above invention, the piston is an outer end of the pin hole opposite to each other, and when viewed from the outer end side, the relative position with respect to the axis of the pin hole is different from each other up to the clip groove. A conveying device (31) having an extending working recess (13) and conveying the piston with the top of the piston facing downward, and the piston conveyed by the conveying device with respect to the conveying direction, the pin An alignment device (32) that aligns so that the axis of the hole extends in a predetermined direction, and an image of the outer end side of the pin hole of the piston aligned by the alignment device, and from the position of the working recess A piston direction determination device (34) for determining whether the direction of the piston is an appropriate direction or a reverse direction rotated by 180 ° with respect to the appropriate direction; and the piston direction determination device When the determination is in the proper direction, the piston is gripped and arranged with respect to the guide member. On the other hand, when the determination is in the reverse direction, the piston is gripped and the piston is rotated 180 ° around its axis. It is good to have a chuck device (37) which arranges the piston with respect to the guide member after rotating.

  According to this configuration, the pistons supplied to the conveyor are aligned in a predetermined proper direction, are gripped by the chuck device in the aligned state, and are arranged at a predetermined position with respect to the guide member. The alignment here is such that the skirt portion arranged on the thrust side and the skirt portion arranged on the anti-thrust side are distinguished by the position of the working groove, and each skirt portion is aligned so as to face the appropriate direction. The

  In the above invention, the alignment device is disposed at a position corresponding to the pin boss portion and the skirt portion of the piston placed on the transport device, and has a pair of rotations having a rotation axis parallel to the axis of the piston. A minimum distance between the outer surfaces of the pair of rotating members is substantially equal to a minimum width of the outer surface formed by the pin boss portion and the skirt portion, and the piston is between the pair of rotating members. It is good to pass.

  According to this structure, the lower part of the piston constituted by the pin boss part and the skirt part is aligned by passing between the rotating members having a predetermined width. Since the width of the lower part of the piston varies depending on the direction due to the shape of the pin boss part and the skirt part, the piston rotates around the axis of the piston so as to pass between rotating members having a predetermined width, and is aligned by changing the direction. The rotating member applies a rotational force to the piston by contacting the pin boss portion and the skirt portion of the piston, and promotes the rotation and alignment of the piston.

  According to the above configuration, in the assembling method and assembling apparatus of the stone pin clip, it is possible to prevent the pin hole from being damaged due to the end portion of the piston pin clip.

Piston side view II-II sectional view of FIG. Bottom view of piston Side view showing enlarged pin hole of piston Block diagram showing the configuration of the piston pin clip assembly device Schematic showing the first half of the piston pin clip assembly device Cross section of piston pin clip mounting device of piston pin clip assembly device Perspective view showing clip holding member A perspective view showing a slider and a piston pin clip Cross section of inspection equipment

  Hereinafter, embodiments of a piston pin clip assembling method and assembling apparatus according to the present invention will be described with reference to the drawings.

(piston)
First, with reference to FIGS. 1 to 4, a piston structure in which a method and an apparatus for assembling a piston pin clip 15 according to the present invention are used will be described. The piston 1 is used for a reciprocating internal combustion engine. The piston 1 includes a disk-like top 2 (crown), a pair of pin bosses 3 projecting from the back surface of the top 2, and a pair of skirts with the outer periphery of the top 2 extending to the back side. Part 4. The surface of the top 2 constitutes the lower part of the combustion chamber in cooperation with the cylinder of the internal combustion engine. First to third grooves 5 to 7 extending in the circumferential direction and forming an annular shape are formed on the outer peripheral portion of the top 2. A first compression ring, a second compression ring, and an oil ring (not shown) are fitted into the first to third grooves 5 to 7 in the order described.

  The pair of pin bosses 3 are arranged at positions symmetrical to each other around the axis of the piston 1, the pair of skirt parts 4 are arranged at positions symmetrical to each other, and the pin boss parts 3 and the skirt parts 4 are alternately arranged in the circumferential direction. Is arranged. Both side edges in the circumferential direction of each skirt portion 4 are continuous with side edges of the adjacent pin boss portions 3.

  The pair of skirt portions 4 includes a thrust side skirt portion 4A disposed on the thrust side when the piston 1 is received in a cylinder of the internal combustion engine, and an anti-thrust side skirt portion 4B disposed on the anti-thrust side.

  Each pin boss portion 3 is formed with a pin hole 10. Each pin hole 10 has a circular cross section, is arranged coaxially with each other, and penetrates the pin boss portion 3. The inner diameters of the pin holes 10 are set to be equal to each other. A cylindrical boss is formed around the pin hole 10 of each pin boss portion 3 so as to extend the pin hole 10 in the axial direction. Among the open ends of each pin hole 10, the open ends facing each other are defined as the inner ends, and the open ends opened in opposite directions are defined as the outer ends. A piston pin 9 that rotatably supports the small end of the connecting rod 8 is inserted into each pin hole 10.

  Hereinafter, for convenience of explanation, it is assumed that the axis of the piston 1 extends in the vertical direction and the axis of the pin hole 10 extends in the left-right direction. The setting of this direction does not limit the orientation when the piston 1 is used and when the piston pin clip 15 is set to the assembly device.

  On the inner wall of each pin hole 10, one clip groove 11, a plurality of side relief grooves 12 (broach grooves), and one work groove 13 are formed. The clip groove 11 is a groove that extends in the circumferential direction on the inner wall of the pin hole 10 around the axis of the pin hole 10 and has an annular shape.

  The side relief groove 12 extends in parallel with the axis of the pin hole 10 on the inner wall of the pin hole 10, crosses the side relief groove 12, and both end portions thereof reach and reach both end portions of the pin hole 10. In the present embodiment, two side relief grooves 12 are provided, and are provided at positions that are symmetric with respect to the axis of the pin hole 10 above and below the axis of the pin hole 10. The cross section of each side relief groove 12 has an arcuate shape surrounded by arcs and strings. The depth of the deepest portion of the side relief groove 12 is set equal to the depth of the deepest portion of the clip groove 11.

  The working groove 13 extends through the inner wall of the pin hole 10 in parallel with the axis of the pin hole 10, crosses the clip groove 11, reaches the outer end of the pin hole 10, and opens. The working groove 13 of the left pin boss portion 3 is disposed obliquely lower left with respect to the axis of the pin hole 10 when viewed from the left (outward) along the axis of the pin hole 10, and the right pin boss portion When viewed from the left (outside) along the axis of the pin hole 10, the work groove 13 is disposed obliquely lower right with respect to the axis of the pin hole 10. In other words, each working groove 13 is arranged on the side opposite to the thrust side skirt 4 </ b> B with respect to the axis of the pin hole 10.

  A piston pin clip 15 (circlip) for locking the piston pin 9 is attached to the clip groove 11. The piston pin clip 15 is formed in a substantially annular shape having a cleavage portion 15A in a part in the circumferential direction, that is, in a C shape. The piston pin clip 15 is made of a flexible material including a metal material such as spring steel. The piston pin clip 15 is elastically deformed so that both end portions 15B approach each other, and the outer width (outer diameter) can be reduced.

  The outer shape of the piston pin clip 15 has a portion having a width larger than the inner diameter of the pin hole 10 in a state where no load is applied (referred to as an initial state). Further, the outer shape of the piston pin clip 15 is smaller than the inner diameter of the pin hole 10 in a state where a radially inward load is applied (referred to as a contracted state). When the piston pin clip 15 is inserted into the pin hole 10, a radially inward load is applied to the piston pin clip 15 to bring it into a contracted state. When the piston pin clip 15 inserted into the pin hole 10 reaches the clip groove 11, the outer width of the piston pin clip 15 is expanded by the restoring force, and the outer peripheral portion is locked to the clip groove 11.

  As shown by a two-dot chain line in FIG. 4, when the piston pin clip 15 is contracted and inserted into the pin hole 10, the piston 1 and the piston 1 are arranged so that both end portions 15 </ b> B of the piston pin clip 15 correspond to the side relief grooves 12. The relative position with respect to the piston pin clip 15 is determined. By determining the position in this way, when the piston pin clip 15 moves in the pin hole 10 to the clip groove 11, both end portions 15 </ b> B of the piston pin clip 15 pass through the side relief groove 12, and the inner wall of the pin hole 10. Contact with is avoided. Thereby, damage, such as a damage | wound and a dent accompanying the contact to the inner wall of the pin hole 10 of the both ends 15B of the piston pin clip 15, is prevented.

(Clip assembly device)
Next, the clip assembly apparatus 30 for assembling the piston pin clip 15 in the clip groove 11 of the piston 1 will be described. The clip assembling apparatus 30 of the present application is configured as an apparatus for assembling the piston pin clip 15 in the clip groove 11 of one pin hole 10 before the piston pin 9 is inserted. As shown in FIG. 5, the clip assembling device 30 includes a transport conveyor 31 that transports the piston 1, first and second alignment devices 32 and 33 that align the piston 1 on the transport conveyor 31, and first and second The piston direction detector 34 detects whether the direction of the piston 1 aligned by the two alignment devices 32 and 33 is an appropriate direction or the reverse direction, and the piston 1 that has passed the piston direction detector 34 is transferred from the conveyor 31. The receiving stage 35, the third aligning device 36 for aligning the piston 1 on the stage 35, and the piston 1 aligned by the third aligning device 36, including the reversing operation according to the direction of the piston 1, A chuck device 37 for chucking (gripping) and a clip for attaching the piston pin clip 15 to the piston 1 supported by the chuck device 37. A flop mounting device 38, and an inspection device 39 to inspect whether the piston pin clip 15 in the piston 1 is properly mounted.

(First alignment device)
The conveyor 31 includes a plurality of pulleys and a flexible conveyor belt that is stretched around the pulleys, and the mounting surface is substantially horizontal. As shown in FIG. 6, the piston 1 is placed substantially at the center of the transport surface of the transport conveyor 31 with the top portion 2 facing down. The piston 1 holds the position and direction (the direction of the pin boss part 3 and the skirt part 4 with respect to the flow direction of the conveyor 31) in a state where no external force is applied due to the frictional force generated between the piston 1 and the conveyor belt. On the other hand, when an external force is applied to the piston 1, the piston 1 slides on the conveyor belt in accordance with the external force, and the position and direction change. The conveyor 31 conveys the piston 1 to the first alignment device 32, the second alignment device 33, and the piston direction detection device 34 in order, and finally delivers the piston 1 to the stage 35.

  As shown in FIG. 6, the first alignment device 32 includes a pair of rotating members 41 disposed above the transport conveyor 31 of the transport conveyor 31 so as to be separated from the transport surface. Each rotating member 41 includes at least two pulleys 42A and 42B, and a flexible belt 43 that spans the pulleys 42A and 42B. The pulleys 42A and 42B are arranged so that the rotation axis is substantially orthogonal to the conveying surface, and the surfaces of the belt 43 are arranged to face each other. The pair of rotating members 41 are arranged so as to be symmetric with respect to the center line of the conveyor 31 when viewed from above.

  Each rotating member 41 is disposed at a height corresponding to the pin boss portion 3 and the skirt portion 4 of the piston 1. As a result, the pin boss part 3 and the skirt part 4 of the piston 1 conveyed by the conveyor 31 can come into contact with each rotating member 41, while the top part 2 does not come into contact with the rotating member 41 and passes below it. To do.

  Each rotating member 41 has an upstream pulley 42A disposed upstream with respect to the flow direction of the conveyor 31 and a downstream pulley 42B disposed downstream, and between the corresponding upstream pulleys 42A. The pulleys 42A and 42B are arranged such that the distance between the pulleys 42A and 42B becomes larger than the distance between the downstream pulleys 42B corresponding to each other. Thereby, the width | variety becomes narrow as the channel | path formed between a pair of rotation members 41 progresses downstream along the flow direction of the conveyor 31. The distance between the downstream ends of the pair of rotating members 41 in the flow direction of the conveyor 31 (the distance between the surfaces of the belt 43 of each rotating member 41) is the distance between the outer surfaces of the pair of pin boss portions 3 of the piston 1. Is set approximately equal. Specifically, the distance between the downstream ends of the pair of rotating members 41 is set to be larger than the distance between the outer surfaces of the pair of pin boss portions 3 so that the difference is small. That is, the pair of pin boss portions 3 can pass between the downstream ends of the pair of rotating members 41, but the distance between the downstream ends of the rotating members 41 so that the gap between the pair of pin boss portions 3 and the rotating member 41 is small when passing. Is set. The distance between the downstream ends of the pair of rotating members 41 is set to be smaller than the distance between the outer surfaces of the pair of skirt portions 4.

  In the present embodiment, the rotation directions of the rotating members 41 are set to be the same. In other embodiments, the rotation directions of the rotating members 41 may be set in opposite directions. The piston 1 placed on the conveyor 31 enters between the pair of rotating members 41, contacts each rotating member 41 according to the position and direction with respect to its own conveyor 31, and rotates and displaces on the conveying surface. . The piston 1 is guided by each rotating member 41 so as to be able to pass between the downstream ends of the pair of rotating members 41 and is displaced toward the center line side of the conveyor belt, and the pair of skirt portions 4 are flow directions of the conveyor 31 It is arranged before and after.

(Second alignment device)
As shown in FIG. 6, the second alignment device 33 has a pair of guide walls 45. The pair of guide walls 45 is disposed above the transport conveyor 31 and downstream of the pair of rotating members 41 in the flow direction of the transport conveyor 31. The pair of guide walls 45 are disposed so as to be symmetric with respect to the center line of the conveyor 31 when viewed from above. The distance between the pair of guide walls 45 is set equal to the distance between the outer surfaces of the pair of pin boss portions 3 of the piston 1. The distance between the pair of guide walls 45 is set constant within a predetermined range along the flow direction of the conveyor 31. Further, the upstream ends of the guide walls 45 are separated from each other toward the upstream side, and are widened so as to increase the distance. The piston 1 placed on the transport surface is guided by the guide walls 45 when passing between the pair of guide walls 45, and the pair of skirt portions 4 are accurately moved forward and backward with respect to the flow direction of the transport conveyor 31. Placed in. That is, the piston 1 is aligned by passing through the first aligning device 32, and is more accurately aligned by passing through the second aligning device 33.

(Piston direction detection device)
As shown in FIG. 6, the piston direction detection device 34 detects the direction of the piston 1 that has passed through the first and second alignment devices 32, 33, and the thrust side skirt portion 4 </ b> A is on the front side (in the flow direction of the transport conveyor 31). Those arranged on the downstream side are determined to be in the proper direction, and those in which the anti-thrust side skirt portion 4B is arranged on the front side are determined to be in the reverse direction. The piston direction detection device 34 includes an imaging device 47 such as a camera that images the piston 1 on the conveyor 31, and an image analysis device 48 that analyzes an image acquired by the imaging device 47. The imaging device 47 is disposed on the side of the conveyor 31 and images the pin boss portion 3 of the piston 1 flowing on the conveyor 31 from the outside. The image analysis device 48 detects the position of the working groove 13 from the captured image of the pin boss portion 3, and the working groove 13 is obliquely rearward with respect to the pin hole 10 (upstream in the flow direction of the conveyor 31). It is determined that a certain direction is an appropriate direction and that the work groove 13 is obliquely forward with respect to the pin hole 10 as a reverse direction. The image analysis device 48 outputs information related to the direction of the piston 1 to a control device (not shown) of the clip assembling device 30.

(stage)
As shown in FIG. 6, the stage 35 is provided at the downstream end of the transport conveyor 31. The piston 1 moves from the conveyor 31 to the stage 35 in a state where the top 2 is on the lower side and the direction is maintained.

(Third alignment device)
As shown in FIG. 6, the third alignment device 36 has a pair of clamping members 51 disposed above the placement surface of the stage 35. The pair of sandwiching members 51 are supported so as to be able to advance and retract substantially parallel to the mounting surface of the stage 35, and the pin boss portion 3 and the skirt portion 4 of the piston 1 can be sandwiched between the tip portions. Each clamping member 51 is advanced and retracted by a drive device (not shown) such as an air cylinder. The front end portion 51A of each clamping member 51 has an external shape complementary to the external shape of the pin boss portion 3 and the skirt portion 4 of the piston 1, and the piston 1 is brought into a predetermined position by sandwiching the pin boss portion 3 and the skirt portion 4. Arrange and align in a predetermined direction.

(Chuck device)
As shown in FIG. 6, the chuck device 37 includes a main body portion 37A and a plurality of claw portions 37B provided on the main body portion 37A so as to be displaceable. The main body portion 37A is supported by an arm (not shown) and can move within a predetermined range. The main body portion 37A is accessible above the piston 1 placed on the stage 35 with the top portion 2 down, and grips at least one of the pin boss portion 3 and the skirt portion 4 between the plurality of claw portions 37B. Then, the piston 1 is lifted from the stage 35. Then, the chuck device 37 moves to a predetermined position (set position) of a clip mounting device 38 to be described later. At this time, when the determination result of the piston direction detection device 34 is an appropriate direction, the chuck device 37 moves to a predetermined position of the clip mounting device 38. On the other hand, if the determination result is in the reverse direction, the chuck device 37 rotates 180 ° around the axis of the piston 1 until it moves to a predetermined position of the clip mounting device 38, so that the piston 1 in the reverse direction is in the proper direction. . Thereby, even if the direction of the piston 1 aligned by the first and second alignment devices 32 and 33 is the reverse direction, the piston 1 is corrected to an appropriate direction and is arranged at a predetermined position of the piston pin clip 15 mounting device. The

(Clip mounting device)
As shown in FIG. 7, the clip mounting device 38 includes a base (not shown), a positioning shaft 54 that positions the piston 1, a clip supply device 56 that supplies the piston pin clip 15, and a supplied piston pin. A guide member 57 that guides the pin 15 to the pin hole 10 while reducing the diameter of the clip 15, and a pressing device 58 that moves the piston pin clip 15 in the guide member 57 and the pin hole 10 to the clip groove 11. The clip supply device 56 is supported by the base so as not to be displaced. The positioning shaft 54, the guide member 57, and the pressing device 58 are attached to the base via a driving device such as an air cylinder or a numerically controlled arm, and can be displaced between a standby position and a use position. .

  The chuck device 37 supports the piston 1 at a predetermined position with respect to the base so that the axis of the pin hole 10 extends vertically. The position of the piston 1 at this time is set as a set position. The rotational position around the axis of the pin hole 10 of the piston 1 at the set position will be described in detail later. Both ends 15B of the piston pin clip 15 supplied from the guide member 57 and one of the side relief grooves 12 are mutually connected. Set to correspond.

  The positioning shaft 54 is a shaft member having an outer diameter that can be fitted into the pin hole 10. The positioning shaft 54 is supported by the base so that its axis extends vertically and is displaceable between a standby position and a use position. The positioning shaft 54 is arranged coaxially with the axis of the pin hole 10 below the piston 1 in the set position at the standby position. In the use position displaced upward from the standby position, the positioning shaft 54 passes through the pin hole 10 disposed on the lower side of the piston 1 in the set position, and the clip of the pin hole 10 whose upper end portion is disposed on the upper side. It rushes into a lower part than the groove 11. Thereby, the position of the piston 1 is centered.

  The clip supply device 56 has a supply device main body 61 attached to the base. The supply device main body 61 includes a supply passage 62 and a slider passage 63. The supply passage 62 extends substantially vertically and has an upper end opened on the upper surface of the supply apparatus body 61 to form a supply port 62A. The supply passage 62 has a circular cross section, and its inner diameter is set larger than the outer diameter of the piston pin clip 15 in the initial state.

  A clip holding member 65 is inserted into the supply passage 62 and coupled thereto. As shown in FIGS. 7 and 8, the clip holding member 65 includes a columnar column portion 65A, and a rib 65B that protrudes in the radial direction from the side surface of the column portion 65A and extends along the longitudinal direction of the column portion 65A. And have. The clip holding member 65 is coupled to the inner wall of the supply passage 62 at the protruding end of the rib 65B. The rib 65 </ b> B can be said to be a connecting portion that couples the column portion 65 </ b> A to the inner wall of the supply passage 62. By attaching the clip holding member 65 to the supply passage 62, the space formed between the inner surface of the supply passage 62 and the outer surface of the holding member has a C-shaped cross section. The outer diameter of the column portion 65A is smaller than the inner diameter of the piston pin clip 15 in the initial state, and the width in the circumferential direction of the column portion 65A of the rib 65B is the distance between both ends of the piston pin clip 15 in the initial state (of the cleavage portion 15A). Width). Thereby, the piston pin clip 15 inserted into the supply passage 62 is disposed so that both end portions 15B face the side surfaces of the rib 65B, and the positions of both end portions 15B are determined.

  As shown in FIG. 7, the slider passage 63 extends in a substantially horizontal direction, and at least one end opens to the supply device side contact surface 61 </ b> A that is one of the side surfaces of the supply device main body 61 to form a first end. doing. In the present embodiment, the end opposite to the first end opens on the side surface of the clip supply device 56 and forms the second end. The cross section of the slider passage 63 is formed in a flat, substantially rectangular shape that is long in the horizontal direction. A lower end of the supply passage 62 is connected to an intermediate portion in the longitudinal direction of the slider passage 63. The rib 65B of the clip holding member 65 received in the supply passage 62 is arranged on the second end side when viewed from above.

  A prism-shaped slider 68 (clip insertion member) is disposed in the slider passage 63 so as to be able to advance and retract along the extending direction of the slider passage 63. An end portion of the slider 68 corresponding to the first end side of the slider passage 63 is a tip portion, and an opposite end portion is a base end portion. A direction perpendicular to the longitudinal direction and the vertical direction of the slider 68 is defined as a width direction of the slider 68. The slider 68 slides between a retracted position where the clip support portion 70 is disposed directly below the supply passage 62 and a forward position where the clip support portion 70 protrudes outward from the first end of the slider passage 63.

  The slider 68 is formed in a flat, substantially rectangular shape with a long cross section in the width direction, and its upper and lower surfaces are in sliding contact with the upper and lower surfaces of the slider passage 63. The width of the slider 68 is set smaller than the width of the slider passage 63. The slider 68 can move forward and backward along the longitudinal direction of the slider passage 63 in the center portion in the width direction of the slider passage 63.

  As shown in FIGS. 7 and 9, a clip support portion 70 that supports the piston pin clip 15 supplied from the supply passage 62 is formed at the upper portion of the tip portion of the slider 68. The clip support portion 70 has a support surface 70 </ b> A that is recessed in a stepped manner with respect to the upper surface of the slider 68. The support surface 70 </ b> A reaches the front end surface of the slider 68. The support surface 70A is formed in parallel with the upper surface of the slider 68, and the vertical distance between the support surface 70A and the upper surface of the slider 68 is set to be approximately the same as the diameter of the cross section of the piston pin clip 15. A vertical wall 70B extending vertically is formed at the boundary between the base end side end of the support surface 70A and the upper surface of the slider 68.

  A convex portion 70C that protrudes upward is formed at the central portion in the width direction of the support surface 70A. The convex portion 70C extends along the longitudinal direction of the slider 68, and is connected to the vertical wall 70B on the base end side. On the other hand, the end portion on the front end side of the convex portion 70 </ b> C is disposed with a predetermined distance from the front end surface of the slider 68. The width of the convex portion 70C is set smaller than the distance between both end portions 15B of the piston pin clip 15 in the initial state.

  As shown in FIG. 7, the guide member 57 has a guide hole 73 whose axis extends vertically. The guide hole 73 is a conical hole whose width gradually decreases from the upper end that is one end to the lower end that is the other end, and is a through-hole that opens at the upper end and the lower end. The inner wall of the guide hole 73 is formed with a smooth tapered surface. The inner diameter of the lower end of the guide hole 73 is set to be equal to or smaller than the inner diameter of the pin hole 10. In the present embodiment, the inner diameter of the lower end of the guide hole 73 is set equal to the inner diameter of the pin hole 10.

  The guide member 57 is disposed at a position away from the piston 1 at the set position in the standby position. When the guide member 57 is moved downward from the standby position, the lower end of the guide hole 73 is continuous with the upper end of the pin hole 10 disposed on the upper side of the piston 1 at the set position, and the axis of the guide hole 73 and the pin The axis of the hole 10 is coaxial. Further, at the use position, the guide member 57 side contact surface, which is a part of the side surface, of the guide member 57 contacts the supply device side contact surface 61A.

  The guide member 57 has an inlet passage 74 that extends from the upper portion of the guide hole 73 in the radial direction of the guide hole 73 and opens to the contact surface on the guide member 57 side. The cross section of the inlet passage 74 has a flat and substantially rectangular shape, and is formed in the same shape as the cross section of the slider passage 63. The opening end of the inlet passage 74 on the contact surface on the guide member 57 side communicates with the first end of the slider passage 63 when the guide member 57 is in the use position. Thereby, when the guide member 57 is in the use position, the slider 68 can pass through the inlet passage 74 in the forward movement position and can enter the guide hole 73.

  The diameter of the portion of the guide hole 73 connected to the supply passage 62 is set to be smaller than the width of the inlet passage 74 and the slider passage 63 and smaller than the outer diameter of the piston pin clip 15 in the initial state.

  The pressing device 58 includes a columnar support shaft 76 and a plurality of pressing pieces 77 supported on the outer surface of the support shaft 76. Each pressing piece 77 is supported so as to be displaceable in the radial direction within a predetermined range with respect to the support shaft 76. An urging member 78 such as a spring is interposed between each pressing piece 77 and the support shaft 76, and each pressing piece 77 is urged radially outward of the support shaft 76. Each pressing piece 77 forms a circular outline in cooperation with each other. Each pressing piece 77 is set to an outer shape that can enter the upper end of the guide hole 73 in an initial state where no load is applied.

  The pressing device 58 is disposed at a position away from the piston 1 in the set position and the guide member 57 in the use position in the standby position. In the standby position, the support shaft 76 is arranged coaxially with the pin hole 10 of the piston 1 in the set position. The pressing device 58 moves downward along the vertical direction from the standby position, and enters the guide hole 73 and can pass through the guide hole 73 and enter the pin hole 10. The pressing device 58 moves inward in the radial direction against the urging force of the urging member 78 when each pressing piece 77 is pressed against the inner wall of the guide hole 73 when moving downward in the guide hole 73. The width becomes smaller. Thereby, the pressing device 58 can slide on the inner wall of the guide hole 73 while changing the outer diameter according to the inner diameter of the guide hole 73. That is, the pressing device 58 can change the outer diameter according to the guide hole 73 that is a conical hole.

  In the clip mounting device 38 according to the present embodiment, when the piston 1 in the set position is viewed from the axial direction (vertical direction) of the pin hole 10, one of the two side relief grooves 12 is the axial line of the guide hole 73. On the other hand, it arrange | positions so that it may correspond with the part in which the entrance channel | path 74 was formed.

  Next, the operation of the clip mounting device 38 will be described. The piston pin clip 15 is supplied to the supply passage 62 from the supply port 62A. In the supply passage 62, the piston pin clip 15 is disposed so that both end portions 15B sandwich the rib 65B, and its rotational position is determined. The supply passage 62 can hold the plurality of piston pin clips 15 in an aligned state.

  When the slider 68 is in the retracted position, the piston pin clip 15 falls from the supply passage 62 onto the support surface 70A by gravity and is placed on the support surface 70A. Since both ends 15B of the piston pin clip 15 are disposed on the second end side by the ribs 65B in the supply passage 62, the convex portion 70C is disposed between the both ends 15B on the support surface 70A, and the rotation is restricted. Is done. At this time, the end portion on the distal end side of the convex portion 70C is disposed inside the piston pin clip 15, and the piston pin clip 15 does not overlap the convex portion 70C. Further, the outer diameter of the piston pin clip 15 in the initial state is larger than the width of the slider 68, and the piston pin clip 15 projects outward from the slider 68 in the width direction.

  When one piston pin clip 15 is placed on the support surface 70A, the next piston pin clip 15 disposed in the supply passage 62 abuts on the piston pin clip 15 placed on the support surface 70A, It cannot enter the slider passage 63. When the slider 68 moves from the retracted position toward the advanced position, the upper surface of the slider 68 closes the lower end of the supply passage 62, and the next piston pin clip 15 comes into contact with the upper surface of the slider 68 and remains in the supply passage 62. In this manner, the piston pin clips 15 are paid out one by one from the supply passage 62 to the clip support portion 70 of the slider 68.

  When the slider 68 is displaced from the retracted position to the advanced position, the piston pin clip 15 supported by the clip support portion 70 moves from the slider passage 63 through the inlet passage 74 into the guide hole 73. At this time, the piston pin clip 15 is pushed into the guide hole 73 while the inner peripheral portion of the piston pin clip 15 is pressed by the end of the vertical wall 70 </ b> B and the outer periphery of the piston pin clip 15 slides on the inner wall of the guide hole 73. To do. As a result, the piston pin clip 15 is pressed radially inward by the inner wall of the guide hole 73 and is reduced in diameter. When the slider 68 moves from the forward position to the retracted position while the piston pin clip 15 is supported by the inner wall of the guide hole 73, the piston pin clip 15 stays in the guide hole 73 and only the slider 68 moves to the retracted position.

  The pressing device 58 presses the piston pin clip 15 disposed in the guide hole 73 in each pressing piece 77 downward, and moves the piston pin clip 15 to the clip groove 11 of the pin hole 10. When the piston pin clip 15 moves downward in the guide hole 73, the piston pin clip 15 is pushed radially inward by the inner wall of the guide hole 73 to reduce the outer diameter, and enters the inner hole of the pin hole 10 at the lower end of the guide hole 73. It becomes possible size. The pressing device 58 pushes the piston pin clip 15 downward with a uniform load at each part in the circumferential direction, and the piston pin clip 15 does not rotate in the process of moving downward.

  In the present embodiment, one of the side relief grooves 12 of the piston 1 arranged at the set position and both end portions 15B of the piston pin clip 15 supplied from the guide member 57 to the pin hole 10 are in the axial direction of the pin hole 10. The arrangement of the clip supply device 56 and the chuck device 37 is determined so as to correspond to each other when viewed along (vertical direction). The clip supply device 56 determines the positions of both end portions 15B of the piston pin clip 15 supplied to the guide member 57, and the guide member 57 maintains the positions of both end portions 15B of the supplied piston pin clip 15 in the pin hole 10. In order to supply, both ends 15B of the piston pin clip 15 and one of the side relief grooves 12 can be made to correspond to each other by the arrangement of the clip supply device 56 and the chuck device 37.

  As shown by a two-dot chain line in FIG. 4, one of the side relief grooves 12 of the piston 1 arranged at the set position and both end portions 15B of the piston pin clip 15 supplied from the guide member 57 to the pin hole 10 are mutually connected. Since the piston pin clip 15 is slid in the pin hole 10 by the pressing member, the both end portions 15B of the piston pin clip 15 pass through the portion where the side relief groove 12 is formed. Contact with the inner surface of the pin hole 10 is avoided. Thereby, damage, such as a damage | wound and a dent which arises when the both ends 15B of the piston pin clip 15 contact the inner surface of the pin hole 10, is prevented.

  The pressing device 58 moves downward to a position where the piston pin clip 15 reaches the clip groove 11 of the pin hole 10. When the piston pin clip 15 reaches the clip groove 11, the piston pin clip 15 expands outward in the radial direction by a restoring force, and its outer peripheral portion is fitted into the clip groove 11.

(Inspection equipment)
As shown in FIG. 10, the inspection device 39 is a device that inspects whether or not the piston pin clip 15 is properly mounted in the clip groove 11 of the piston 1. The inspection device 39 includes a support body 81, a center shaft 82 that extends downward from the support body 81 and is supported so as to be vertically changeable with respect to the support body 81, and is supported by the support body 81. And a plurality of outer peripheral pieces 83 arranged on the outer periphery. The central shaft 82 has a conical shape whose diameter decreases as it goes downward. Each outer peripheral piece 83 is supported by the support body 81 so as to be displaceable in the radial direction of the central shaft 82. An urging member 84 such as a spring for urging each outer peripheral piece 83 toward the central shaft 82 is interposed between the support 81 and each outer peripheral piece 83. In the inspection device 39, when the central shaft 82 moves downward, each outer peripheral piece 83 is pressed against the conical outer surface of the central shaft 82, and each outer peripheral piece 83 is displaced radially outward. In other words, the outer diameter of the contour of the inspection device 39 formed by each outer peripheral piece 83 changes according to the displacement of the central shaft 82. Therefore, a value corresponding to the outer diameter of the contour can be acquired by detecting the amount of displacement of the central shaft 82 with a stroke sensor such as a potentiometer. The downward displacement of the central shaft 82 is caused when the load applied to the central shaft 82 exceeds a predetermined value, that is, each outer peripheral piece 83 contacts another object, and each outer peripheral piece 83 moves radially outward. Stops when is regulated.

  The inspection device 39 includes a support 81 that is displaceably supported by a base, a retracted position, a standby position disposed above the piston 1 in the set position, a center shaft 82 and each outer peripheral piece 83 of the piston 1. It is displaced between the use position that has entered the pin hole 10 disposed on the upper side.

  When the piston pin clip 15 is properly mounted in the clip groove 11 of the piston 1, each outer peripheral piece 83 of the inspection device 39 comes into contact with the inner peripheral portion of the piston pin clip 15. On the other hand, when the piston pin clip 15 is not mounted in the clip groove 11, each outer peripheral piece 83 abuts on the inner peripheral surface of the pin hole 10, and is more central than when the piston pin clip 15 is properly mounted. The displacement amount of the shaft 82 is increased. Further, when the piston pin clip 15 is sandwiched not by the clip groove 11 but by the inner peripheral surface of the pin hole 10, each outer peripheral piece 83 has a smaller diameter than when positioned in the clip groove 11. 15, and the amount of displacement of the central shaft 82 becomes small. Further, even when two piston pin clips 15 are mistakenly attached, one piston pin clip 15 cannot fit into the clip groove 11, so that each outer peripheral piece 83 is more than the case where each outer peripheral piece 83 is positioned in the clip groove 11. It will contact | abut to the inner peripheral part of the piston pin clip 15 reduced in diameter, and the displacement amount of the center axis | shaft 82 will become small. Thus, the inspection device 39 determines whether or not the piston pin clip 15 is properly attached to the clip groove 11 based on the amount of displacement of the central shaft 82.

  Hereinafter, effects of the clip assembling apparatus 30 according to the present embodiment will be described. In the clip mounting device 38, both end portions 15 </ b> B (cleavage portion 15 </ b> A) of the piston pin clip 15 supplied to the guide hole 73 of the guide member 57 by the clip supply device 56, and the side relief groove of the piston 1 gripped by the chuck device 37. Since the piston pin clip 15 is inserted into the pin hole 10 in a state where the positional relationship is maintained, both end portions 15B of the piston pin clip 15 have portions corresponding to the side relief grooves 12. Passing between the two ends 15B of the piston pin clip 15 and the inner wall of the pin hole 10 is avoided, and the inner wall of the pin hole 10 is prevented from being damaged or damaged.

  Although the description of the specific embodiment is finished as described above, the present invention is not limited to the above embodiment and can be widely modified. For example, in the above embodiment, the supply passage 62 and the slider passage 63 are formed in the supply device main body 61 of the clip supply device 56, but the supply passage 62 and the slider passage 63 can be omitted. When the supply passage 62 and the slider passage 63 are omitted, the slider 68 can slide on the upper surface of the supply device main body 61 and can enter the inlet passage 74, and the clip holding member 65 is disposed above the slider 68. Good. The clip holding member 65 may be supported by a stand erected on the supply device main body 61 at the rib 65B.

  In the present embodiment, the both end portions 15B of the piston pin clip 15 supplied by the clip supply device 56 are arranged on the second end side of the slider passage 63. However, the positions of the both end portions 15B of the piston pin clip 15 are as follows. Can be set in any direction by appropriately changing the direction of the clip holding member 65 and the shape of the clip support portion of the slider 68. In this case, the orientation of the chuck device 37 is changed according to the positions of both end portions 15B of the piston pin clip 15 supplied to the guide hole 73 by the clip supply device 56, and the piston is viewed from the direction along the axis of the pin hole. It is preferable that both end portions of the pin clip 15 correspond to the positions of the side relief grooves 12.

  Moreover, although the clip assembly apparatus 30 demonstrated the example which mounts the piston pin clip 15 in the one clip groove | channel 11 of the piston 1 in the said embodiment, the clip assembly apparatus 30 is a piston pin clip in both clip groove | channels 11. 15 can be mounted. In this case, after mounting the piston pin clip 15 in one clip groove 11, the piston pin 9 is inserted into the pair of pin holes 10 so as to pivotally support the small end portion of the connecting rod 8, and then the other clip A piston pin clip 15 may be attached to the groove 11. When the piston pin clip 15 is mounted in the other clip groove 11, the chuck device 37 may be rotated 180 ° up and down, and the pin hole 10 in which the other clip groove 11 is formed is disposed on the guide member 57 side. At this time, since the piston pin 9 is inserted into the pair of pin holes 10, the insertion of the positioning shaft 54 into the pin hole 10 may be omitted.

  Moreover, although the structure which consists of the belt 43 and the pulleys 42A and 42B was illustrated as an example of the rotation member 41 of the 1st alignment apparatus 32 in the said embodiment, various structures can be applied to the rotation member 41. FIG. For example, the rotation member 41 may be a pair of disk-shaped rollers arranged so that the rotation axis is substantially orthogonal to the conveyance surface. In this case, the shortest distance between the outer peripheral edges of the pair of rollers is set to be approximately equal to the distance between the outer surfaces of the pair of pin boss portions 3 within a range in which the pair of pin boss portions 3 of the piston 1 can pass. Good. The rotation direction of each roller constituting each rotation member 41 may be the same direction or the opposite direction.

  Further, each of the pair of rotating members 41 may be configured as a roller group including a plurality of rollers. The plurality of rollers constituting each rotating member 41 are arranged such that the respective rotation axes are substantially orthogonal to the conveyance surface. The plurality of rollers constituting each rotating member 41 are arranged along the flow direction of the conveying belt, and are arranged so that the distance between the roller groups becomes smaller as it goes downstream. The rollers disposed on the most downstream side of each pair of rotating members 41 have the shortest distance between their outer peripheral edges within the range in which the pair of pin boss portions 3 of the piston 1 can pass, and the outer surfaces of the pair of pin boss portions 3. It is good to set it substantially equal to the distance between. The rotation direction of each roller constituting each rotation member 41 may be arbitrary. For example, all the rollers may be rotated in the same direction.

  1 ... piston, 2 ... top, 3 ... pin boss, 4A ... thrust skirt, 4B ... anti-thrust skirt, 9 ... piston pin, 10 ... Pin hole, 11 ... clip groove, 12 ... side relief groove, 13 ... working groove, 15 ... piston pin clip, 15A ... cleavage part, 15B ... both ends, 30. .. Clip assembly device, 31 ... Conveyor, 32 ... First alignment device, 33 ... Second alignment device, 34 ... Piston direction detection device, 35 ... Stage, 36 .. Third alignment device 37 ... Chuck device 38 ... Clip mounting device 39 ... Inspection device 41 ... Rotating member 42A ... Upstream pulley 42B Downstream pulley , 43 ... belt, 47 ... imaging device, 48 ... image analysis device, 54 ... positioning shaft, 56 ... clip supply device, 57 ... guide member, 58 ... pressing device 62 ... Supply passage, 63 ... Rider passageway, 65 ... clip holding member, 65A ... column, 65B ... rib, 68 ... slider (clip insertion member), 70 ... clip support, 73 ... guide hole, 74 ... Entrance passage

Claims (5)

A pair of pin bosses; a pin hole formed so as to be coaxial with each other of the pin bosses; and an annular clip groove extending in the circumferential direction on the inner wall of the pin hole; A circumferentially extending one of the clip grooves of the piston having a side relief groove that extends across the clip groove along the axis of the pin hole on the inner wall of the pin hole and opens at the opening end of the pin hole. A method for assembling a piston pin clip for mounting a substantially C-shaped piston pin clip having a cleaving portion at a portion,
Arranging the piston pin clip coaxially with the pin hole and the cleavage portion corresponding to the side relief groove;
The piston pin clip is bent inward in the radial direction, and the piston pin clip is inserted into the pin hole so that both ends forming the cleavage portion of the piston pin clip pass through positions corresponding to the side relief grooves. Inserting the piston pin clip and moving it to the clip groove. A pair of pin bosses; a pin hole formed so as to be coaxial with each other of the pin bosses; and an annular clip groove extending in the circumferential direction on the inner wall of the pin hole; A circumferentially extending one of the clip grooves of the piston having a side relief groove that extends across the clip groove along the axis of the pin hole on the inner wall of the pin hole and opens at the opening end of the pin hole. A piston pin clip assembling device for mounting a substantially C-shaped piston pin clip having a cleaving portion at a part,
The width gradually decreases from the first end to the second end, the second end has a guide hole having an inner diameter equal to or smaller than the inner diameter of the pin hole, and the second end is arranged to be continuous with the pin hole. A guided member;
A clip supply device for supplying the piston pin clip to the guide hole so that the cleavage portion of the piston pin clip corresponds to the side relief groove when viewed from the axial direction of the pin hole;
A piston that has a pressing device that enters into the guide hole, pushes the piston pin clip disposed in the guide hole toward the pin hole, and moves it to the clip groove in the pin hole. Pin clip assembly device. The clip supply device
The piston pin having a vertically extending column and a rib extending vertically on the outer surface of the column, the column being disposed inside the piston pin clip, and the rib forming the cleavage portion A clip holding member that is positioned between both ends of the clip to define the direction of the piston pin clip;
A state in which the piston pin clip is provided below the clip holding member so as to be displaceable between an advance position and a retract position, and drops from the lower end of the column portion at the retract position, and the direction of the piston pin clip is maintained. The clip assembly device according to claim 2, further comprising: a clip insertion member that inserts the piston pin clip into the guide hole at the forward movement position. The piston has an outer end opposite to each other of the pin hole, and has a working recess extending to the clip groove at a position where the relative positions with respect to the axis of the pin hole are different from each other when viewed from the outer end side. And
A transport device for transporting the piston with the top of the piston facing down;
An alignment device that aligns the pistons transported by the transport device such that the axis of the pin hole extends in a predetermined direction with respect to the transport direction;
The outer end side of the pin hole of the piston aligned by the alignment device is imaged, and the direction of the piston is either the appropriate direction or the reverse direction rotated 180 ° with respect to the appropriate direction from the position of the working recess. A piston direction determining device for determining whether or not
When the determination by the piston direction determination device is an appropriate direction, the piston is gripped and arranged with respect to the guide member, while when the determination is in the reverse direction, the piston is gripped and the piston is The clip assembling apparatus according to claim 3, further comprising: a chuck device that arranges the piston with respect to the guide member after being rotated 180 ° around an axis.   The alignment device includes a pair of rotating members disposed at positions corresponding to the pin boss portion and the skirt portion of the piston placed on the transport device, and having a rotation axis parallel to the axis of the piston, The shortest distance between the outer surfaces of the pair of rotating members is substantially equal to the minimum width of the outer surface formed by the pin boss portion and the skirt portion, and the piston passes between the pair of rotating members. Item 5. The clip assembly device according to Item 4.

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