JP2009208184A - Assembling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an assembling device which prevents a fastening ring and the assembling device itself from being damaged and surely assembles the fastening ring to an assembling position. <P>SOLUTION: The assembling device is formed of: a grip portion for gripping the fastening ring 103 in a contracted state; a guide cylinder 35A for holding the fastening ring 103 in the contracted state; and a pressing rod 51A for squeezing the fastening ring 103 held by the guide cylinder 35A into a piston pin insertion hole 100a formed in a piston 100. The fastening ring 103 is pressed by the pressing rod 51A inserted into the guide cylinder 35A, into the piston pin insertion hole 100a. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an assembling apparatus used when assembling a retaining ring.

  Conventionally, for example, as shown in FIG. 15, when connecting the piston 100 of the engine and the connecting rod 101, the piston pin 102 is formed in the piston pin insertion hole 100 a formed in the piston 100 and the piston pin 102 at the small end of the connecting rod 101. Is inserted into the groove 100b formed in the inner peripheral surface of the piston pin insertion hole 100a to prevent the piston pin 102 from coming off (see, for example, Patent Document 1).

  The retaining ring 103 is made of an elastic material and is larger than the inner diameter of the piston pin insertion hole 100a. When the retaining ring 103 is assembled, the retaining ring 103 is reduced in diameter until the outer diameter thereof coincides with the inner diameter of the piston pin insertion hole 100a, and is then pushed into the piston pin insertion hole 100a to be restored into the groove 100b by a restoring force. Fit it.

The retaining ring as described above is used in each part of the machine component, and may be used by being fitted in a groove formed on the outer peripheral surface of the shaft in addition to the hole. In this case, when assembling the retaining ring, the retaining ring is expanded until the inner diameter thereof matches the outer diameter of the shaft, and then pushed into the groove of the shaft, so that the retaining ring is fitted into the groove by a restoring force.
JP 2006-123021 A

  The retaining ring 103 fitted into the piston pin insertion hole 100a as described above needs to be inserted into the piston pin insertion hole (assembly part) 100a of the piston (assembly object) 100a after the outer diameter is once reduced. Becomes complicated. Therefore, it is conceivable to use an assembling apparatus having a guide hole for guiding the retaining ring 103 to the piston pin insertion hole 100a. By forming the guide hole of this assembling apparatus into a tapered shape that gradually expands as shown by the phantom line in FIG. 15, after the retaining ring 103 is arranged on the large diameter side inside the guide hole, When pushing in toward the small diameter side, that is, toward the piston pin insertion hole 100a, the retaining ring 103 shrinks corresponding to the tapered shape of the guide hole, and can be assembled to the piston pin insertion hole 100a.

  However, if the retaining ring 103 is pushed in so as to be retracted greatly, the outer edge portion of the retaining ring 103 strongly contacts the inner circumferential surface of the guide hole when the retaining ring 103 is pushed, and the inner circumferential surface is scraped and damaged. Easy to do. Further, when the piston pin insertion hole 100a is oriented so as to extend in the horizontal direction as shown in FIG. 15, the guide hole of the assembling apparatus must be oriented in the horizontal direction as well, and such a state Thus, when the retaining ring 103 is placed in the guide hole of the assembling apparatus, the retaining ring 103 tends to be inclined (indicated by a virtual line in the figure). If the retaining ring 103 is forcibly pushed in an inclined posture, the retaining ring 103 and the assembling device may be damaged, and the retaining ring 103 may not be reliably assembled to the piston pin insertion hole 100a.

  In addition, when the shaft is an assembly part, it is necessary to once increase the diameter of the retaining ring as described above, but in this case as well, when the retaining ring is pushed in, as in the case of reducing the diameter. There is a risk that the retaining ring and the assembling apparatus will be damaged.

  The present invention has been made in view of such points, and an object of the present invention is to prevent damage to the retaining ring and the assembling apparatus and to reliably assemble the retaining ring to the assembly object. Is to make it.

  In order to achieve the above object, in the present invention, the retaining ring is gripped in a deformed state so as to correspond to the assembly portion of the assembly target object, and is held by the holding portion, and then the assembly target object is obtained. I pushed it to the assembly part and assembled it.

  Specifically, in the first invention, the retaining device is an assembly device for assembling the retaining ring to the assembly object, and the retaining ring is deformed so as to correspond to the assembly part of the assembly object. A gripping part to be gripped, a holding part that holds the retaining ring gripped by the gripping part in the state of the diameter, and the retaining ring that is held by the holding part to the assembly part of the assembly object It is set as the structure provided with the pushing part to push.

  According to this configuration, the retaining ring can be deformed by the gripping part so as to correspond to the part to be assembled, held and held by the holding part, and then pushed to the mounting part by the pushing part. become. Thereby, it is not necessary to greatly deform while pushing the retaining ring as in the case of using the conventional taper-shaped assembly device, and damage to the assembly device is suppressed.

  Further, in a state where the retaining ring is held by the holding portion, the retaining ring remains deformed, so that it comes into pressure contact with the holding portion by its restoring force. Accordingly, the retaining ring is difficult to move carelessly with respect to the holding portion. This prevents the retaining ring from being inclined before being assembled to the assembly portion, so that it can be pushed in smoothly without being forced.

  According to a second invention, in the first invention, the gripping portion is configured to grip the retaining ring in a state in which the retaining ring is expanded, and the holding portion is in a state in which the retaining ring gripped by the gripping portion is expanded in diameter. It shall be comprised so that it may hold | maintain.

  According to this configuration, when the assembly portion of the assembly target is a shaft, the retaining ring can be smoothly assembled in the groove formed on the outer peripheral surface of the shaft.

  According to a third aspect, in the first aspect, the gripping portion is configured to grip the retaining ring with a reduced diameter, and the holding portion has a reduced diameter of the retaining ring gripped by the gripping portion. It shall be comprised so that it may hold | maintain.

  According to this configuration, when the assembly portion of the assembly target is a hole, the retaining ring can be smoothly assembled in the groove formed on the inner peripheral surface of the hole.

  According to a fourth aspect, in the third aspect, the gripping portion includes a plurality of claws that are in contact with each of the circumferentially separated portions of the retaining ring, and a claw driving device that moves the claws in the radial direction of the retaining ring. It is set as the structure provided with.

  According to this configuration, the retaining ring is held in a contracted state by bringing the pawl into contact with the outer peripheral portion of the retaining ring in a free state and then moving the retaining ring radially inward by the pawl driving device. It becomes possible. Since the position of the claw is adjusted by the amount of movement of the claw by the claw driving device, it is possible to grip the retaining rings of various diameters and change the diameter reduction amount of the retaining rings.

  In the fifth invention, in the third or fourth invention, the holding portion has a cylindrical shape, and an inlet portion into which a snap ring in a reduced diameter is inserted is formed at one longitudinal end portion of the holding portion. The other end portion is formed with an exit portion of the retaining ring, and the pushing portion is a pushing member inserted from the inlet portion of the holding portion, and a pushing member drive for moving the pushing member in the longitudinal direction of the holding portion. It is set as the structure provided with an apparatus.

  According to this configuration, the retaining ring is held in a state of being inserted into the holding portion from the inlet portion of the holding portion. The retaining ring is moved out of the outlet portion of the holding portion and assembled to the assembling site by moving the pushing member inserted from the inlet portion of the holding portion by the pushing member driving device.

  According to a sixth invention, in any one of the third to fifth inventions, there is provided a loading portion in which a large number of retaining rings are loaded, and a moving device that moves the gripping portion between the loading portion and the holding portion. The configuration is as follows.

  According to this configuration, after the retaining ring loaded in the loading unit is gripped by the gripping part, the retaining part can be held by the retaining part by moving the gripping part to the retaining part by the moving device.

  According to a seventh invention, in the sixth invention, a plurality of loading portions into which different types of retaining rings are loaded and a plurality of retaining portions that respectively retain the retaining rings are provided.

  According to this configuration, the retaining ring loaded in each loading unit is held by the corresponding holding unit and assembled separately.

  According to the first invention, the retaining ring can be assembled after being held in the holding portion in a state of being deformed so as to correspond to the assembly portion of the object to be assembled. It is not necessary to be greatly deformed while pushing, and it is possible to avoid a tilted posture before the retaining ring is assembled to the assembling part, and the retaining ring can be assembled smoothly. Thereby, damage to a retaining ring and an assembling apparatus can be suppressed, and a retaining ring can be reliably assembled | attached to the assembly | attachment site | part of an assembly target object.

  According to the second invention, the retaining ring in an expanded state can be held by the holding portion, so that the retaining ring can be reliably assembled when the assembly part of the assembly target is a shaft. it can.

  According to the third invention, since the retaining ring in a reduced diameter state can be held by the holding portion, the retaining ring can be reliably assembled when the assembly part of the assembly target is a hole. it can.

  According to the fourth invention, since the claw is moved in the radial direction of the retaining ring by the claw driving device, a plurality of types of retaining rings having different outer diameters can be gripped and the diameter of the retaining ring is reduced. Can be changed. As a result, the types of retaining rings that can be assembled by the assembling apparatus can be increased and the retaining rings can be assembled to various assembling objects, and the versatility of the assembling apparatus can be improved.

  According to the fifth aspect of the present invention, the inlet portion into which the retaining ring is inserted is formed at one end portion of the cylindrical holding portion, the outlet portion is formed at the other end portion, and the pressing member inserted from the inlet portion is the pressing member. Since the retaining ring is assembled by being moved by the driving device, the retaining ring can be guided to the assembling part by the holding portion and can be reliably assembled to the assembling part.

  According to the sixth invention, the retaining ring loaded in the loading unit can be automatically conveyed to the holding unit and then assembled to the assembly site.

  According to the seventh aspect, different types of retaining rings can be assembled separately, and the versatility of the assembling apparatus can be improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  FIG. 1 is a plan view of an assembling apparatus 1 according to an embodiment of the present invention. This assembling apparatus 1 is for assembling a retaining ring 103 that prevents the piston pin 102 connecting the piston 100 and the connecting rod 101 shown in FIG. 15 from coming off. In the description of this embodiment, a connection structure between the piston 100 and the connecting rod 101 will be described before the structure of the assembling apparatus 1 is described. The piston 100 is formed with a piston pin insertion hole 100a. On the other hand, a bearing hole 101a coinciding with the piston pin insertion hole 100a is formed at the small end of the connecting rod 101. The piston pin 102 is inserted into the piston pin insertion hole 100a and the bearing hole 101a. In this state, the piston 100 and the connecting rod 101 are connected. A groove 100b into which the retaining ring 103 is fitted is formed on the inner peripheral surface in the vicinity of both end portions in the axial direction of the piston pin insertion hole 100a.

  The retaining ring 103 is formed by forming spring steel into a C-shape, and is also called a snap ring or a clip. The outer diameter of the retaining ring 103 is set larger than the diameter of the piston pin insertion hole 100a. Therefore, when assembling the retaining ring 103, the retaining ring 103 is shrunk until its outer diameter matches the diameter of the piston pin insertion hole 100a, and then inserted into the piston pin insertion hole 100a and is restored to the groove 100b by a restoring force. I try to fit it. The piston 100 is an assembly object, and the piston pin insertion hole 100a is an assembly part.

  Next, the structure of the assembling apparatus 1 will be described. As shown in FIG. 1, the assembling apparatus 1 includes a pallet conveying device 2 that conveys the pallet P, a loading device 3 that is loaded with a retaining ring 103, a retaining ring conveying device 4 that conveys the retaining ring 103, A guide device 5 for guiding the wheel 103, a pushing device 6 for pushing the retaining ring 103 into the piston pin insertion hole 100a, and a control panel 7 for controlling these devices are provided. The pallet transfer device 2, the loading device 3, the retaining ring transfer device 4, the guide device 5, the push-in device 6, and the control panel 7 are fixed to the base 8.

  The pallet transport device 2 includes a mounting table 10 on which the pallet P is mounted, a rail 11 that guides the mounting table 10 in the horizontal direction, a driving device 12 including an air cylinder, an electric actuator, and the like, and a piston fixing device 13. I have. The mounting table 10 is moved along the rail 11 by the driving device 12.

  Four sets of the pallet P are held in a state where the piston 100 and the connecting rod 101 are connected. These four sets of pistons 100 and connecting rods 101 are arranged on a straight line at equal intervals. As shown in FIG. 2, a connecting rod holding portion Pa for holding the large diameter portion of the connecting rod 101 is formed on the upper side of the pallet P, while a piston holding for holding the side surface of the piston 100 on the lower side of the pallet P. Part Pb is formed. That is, the coupling body of the piston 100 and the connecting rod 101 is held on the pallet P so that the top of the piston 100 faces downward.

  As shown in FIG. 1, the rail 11 extends from the back side (upper side in FIG. 1) to the near side (lower side in FIG. 1) and then to the left side (left side in FIG. 1) of the base 8. It extends toward. The pallet P is placed on the mounting table 10 when the mounting table 10 is located on the back side of the base 8 that is the starting point of the rail 11. The pallet P is conveyed to the left side of the rail 11 and is set to an assembly position (indicated by a solid line in FIG. 1) where the retaining ring 103 is assembled. In addition, the pallet P in the middle of conveyance is shown with the virtual line in the figure.

  The piston fixing device 13 is for holding the piston 100 held on the pallet P in the assembly position so as not to move. The piston fixing device 13 includes a contact member 13a that contacts the side surface of the piston 100 from the side opposite to the piston holding portion Pb of the pallet P, and a moving mechanism that moves the contact member 13a in a direction that contacts and separates from the side surface of the piston 100. 13b. When the pallet P is transported by the pallet transporting device 2, the contact member 13a is at a position sufficiently separated from the piston 100, and when the pallet P is transported to the assembly position and stopped, the contact member 13a is moved to the piston 100. It comes in contact with the side. The piston 100 is sandwiched and fixed between the contact member 13a and the piston holding portion Pb of the pallet P.

  The loading device 3 includes four magazines (loading units) 16A, 16B, 16C, and 16D loaded with retaining rings 103, and four pressing cylinders 17, 17,... That press the retaining rings 103 in the magazines 16A to 16D. The magazines 16A to 16D and the mounting base 18 to which the pressing cylinder 17 is attached are provided. The mounting base 18 is fixed to the base 8. The magazines 16A to 16D have a cylindrical shape, and are lined up in a state in which the axes are horizontally oriented and spaced apart from each other in the radial direction.

  A set opening 16a for inserting the retaining ring 103 into the magazines 16A to 16D is formed at one axial end (the lower end in FIG. 1) of each magazine 16A to 16D. 1 is formed with an outlet portion 16b through which a retaining ring 103 in the magazines 16A to 16D exits. The outlet portions 16b of the four magazines 16A to 16D are located on the same vertical plane. The inner diameters of the magazines 16A to 16D are formed to be slightly larger than the outer diameter of the retaining ring 103 in a free state, and the setting opening 16a and the outlet 16b are the same.

  Three notches 16c are formed on the periphery of the outlet 16b of the magazines 16A to 16D. These notches 16c are arranged at equal intervals in the circumferential direction, and are sized to receive protrusions 28c of a movable claw 28b of a gripping device 28 described later. Moreover, the stopper 16d with which the outer peripheral part of the retaining ring 103 engages protrudes from the inner peripheral surface of the exit part 16b of magazine 16A-16D. Of the retaining rings 103, 103,... In the magazines 16A to 16D, the retaining ring 103 that faces the outlet portion 16b engages with the stopper 16d, so that the retaining ring 103 does not unexpectedly come out of the outlet portion 16b. Yes.

  The magazines 16A to 16D have different inner diameters, and different types of retaining rings 103 are loaded in the magazines 16A to 16D. That is, in the assembling apparatus 1 of this embodiment, the retaining ring 103 is not assembled to one type of piston 100, but the retaining ring 103 corresponding to each piston 100 is assembled to another type of piston 100 (not shown). Can be done. That is, if the type of the piston 100 is different, generally the outer diameter, inner diameter, and thickness of the retaining ring 103 are different, and the loading device 3 of this embodiment prepares different types of retaining rings 103 so as to be able to cope with it. It is possible.

  Each pressing cylinder 17 is composed of, for example, an air cylinder. As shown in FIG. 1, the rod of the pressing cylinder 17 is disposed coaxially with the axis of the magazines 16A to 16D and is inserted into the magazines 16A to 16D from the setting opening 16a. When the rod of the pressing cylinder 17 advances, the retaining ring 103 in the magazines 16A to 16D is pressed toward the outlet portion 16b. On the other hand, the rod is retracted from the setting opening 16a of the magazines 16A to 16D by retreating.

  As shown in FIG. 4, the retaining ring conveyance device 4 includes a gripping portion 20 that grips the retaining ring 103 and a moving device 21 that moves the gripping portion 20, and the moving device 21 includes a plurality of support bars. It is being fixed to the base 8 via 23,23, .... These support rods 23, 23,... Are arranged at intervals in the left-right direction of the base 8, and extend upward from the upper surface of the base 8 as shown in FIG. It is formed to extend. The moving device 21 has a feeding device 24 and a slide cylinder device 25. The feeding device 24 includes a screw rod 24a (shown in FIG. 4), a moving portion 24b (shown in FIGS. 5 and 6) that is screwed into the screw rod 24a and moves by the rotation of the screw rod 24a, and the screw rod 24a. And a motor 24c that rotates. The feeding device 24 is disposed so that the extending direction (feeding direction) of the screw rod 24 a is horizontal and the horizontal direction of the base 8, and is fixed to the distal end portion of the support bar 23.

  The slide cylinder device 25 is attached to the moving part 24 b of the feeding device 24. The slide cylinder device 25 includes a fluid pressure cylinder, and includes a fixed portion 25a fixed to the moving portion 24b of the feeding device 24 and a movable portion 25b that moves relative to the fixed portion 25a by the thrust of the built-in cylinder. Yes. The moving direction of the movable portion 25b of the slide cylinder 25 is horizontal and the depth direction of the base 8 (direction orthogonal to the feeding direction by the feeding device 24). The movable part 25b after the movement is indicated by a virtual line in FIG.

  The gripping unit 20 includes an attachment member 27 that is attached to the movable unit 25 b of the slide cylinder device 25, a gripping device 28, and a gripping unit driving device 29 that drives the gripping device 28. The gripping device 28 is composed of a chuck device used when gripping a workpiece or a drill blade in a general machine tool. That is, as shown in FIGS. 3 and 7, the gripping device 28 includes a cylindrical body 28a, three movable claws 28b, 28b, 28b protruding from one end surface in the axial direction of the body 28a, and movable claws 28b, 28b. , 28b, and a drive member 28d (shown only in FIG. 3). The other axial end surface of the body 28 a is fixed to the attachment member 27.

  The movable claws 28b, 28b, 28b are arranged at equal intervals in the circumferential direction of the body 28a, and are attached to the body 28a so as to be movable in the radial direction. Further, the movable claw 28b is urged toward the outer side in the radial direction of the body 28a. Each movable claw 28b is provided with a projection 28c. The protrusion 28c is positioned at the inner edge in the radial direction of the body 28a on the end face of the movable claw 28b. Each protrusion 28c has a shape that enters the notch 16c of the magazines 16A to 16D.

  As shown in FIG. 3, the drive member 28d of the gripping device 28 is built in the body 28a and has a tapered surface that is in sliding contact with the base of the movable claw 28b. The tapered surface is formed so that the movable claws 28b, 28b, 28b move in the radial direction when the drive member 28d moves in the axial direction of the body 28a inside the body 28a. When 28d is moved to the axially proximal end side (right side in FIG. 3) of the body 28a, the movable claws 28b, 28b, 28b are moved radially inward and moved to the axially distal end side (left side in FIG. 3). The movable claws 28b, 28b, 28b can be moved radially outward.

  As shown in FIG. 6, the gripping part drive device 29 is configured by a known electric actuator having a rod 29a and a cylinder part 29b. The cylinder portion 29b of the gripping portion driving device 29 is fixed to the mounting member 27 so that the axis of the rod 29a is positioned coaxially with the axis of the body 28a of the gripping device 28. The cylinder portion 29b includes a motor 29c, a speed reducer (not shown) that reduces the rotational speed of the motor 29c, and a conversion mechanism (not shown) that converts the rotational force of the motor 29c into the propulsive force of the rod 29a. Is provided. The distal end of the rod 29a is connected to the drive member 28d of the gripping device 28. When the rod 29a is advanced, the drive member 28d moves to the distal end side in the axial direction and the movable claws 28b, 28b, 28b are out of the radial direction. When the drive member 28d is moved backward and moved backward, the drive member 28d is moved to the proximal side in the axial direction, and the movable claws 28b, 28b, 28b are moved inward in the radial direction.

  As shown in FIG. 8B, when the movable claws 28b, 28b, 28b are moved radially outward, the projections 28c, 28c, 28c of the movable claws 28b, 28b, 28b are in a free state. A retaining ring 103 can be arranged. By changing the amount of movement of the movable claws 28b, 28b, 28b, the retaining ring 103 having a different outer diameter can be gripped by the single gripping device 28. 8A, when the movable claws 28b, 28b, and 28b are moved inward in the radial direction, the protrusions 28c, 28c, and 28c are separated from each other in the circumferential direction at the outer peripheral portion of the retaining ring 103. Thus, the retaining ring 103 can be gripped with a reduced diameter. The amount of diameter reduction of the retaining ring 103 can be arbitrarily changed by the amount of movement of the movable claws 28b, 28b, 28b. Further, since the advancement amount and the retraction amount of the rod 29a can be changed steplessly, the movement amounts of the movable claws 28b, 28b, 28b can also be changed steplessly.

  As shown in FIG. 9, the guide device 5 has a plurality of guide tubes 35A, 35B, 35C,..., A support plate 36 that supports the guide tubes 35A, 35C, 35C,. A mounting base 37 is provided. The guide tube 35A is for holding the retaining ring 103 loaded in the magazine 16A and guiding it to the piston pin insertion hole 100a, and the guide tube 35B is a retaining ring 103 loaded in the magazine 16B. The guide cylinder 35C is also for guiding the retaining ring 103 loaded in the magazine 16C in the same manner. Accordingly, the guide cylinders 35A, 35B, and 35C have different inner diameters. There are four guide cylinders 35A, 35B, and 35C corresponding to the distance between the four sets of the piston 100 and the connecting body of the connecting rod 101, and these are arranged at intervals.

  The mounting base 37 is fixed to the base 8. As shown in FIG. 2, a slide rail 38 extending horizontally in the left-right direction of the base 8 is attached to the upper portion of the attachment base 37, and the support plate 36 is placed on the slide rail 38. . A feeding device 39 is attached to the mounting base 37. The screw rod 39a of the feeding device 39 extends in the direction in which the slide rail 38 extends, and a moving portion (not shown) that engages with the screw rod 39a is engaged with the support plate 36. Therefore, when the screw rod 39a of the feeding device 39 is rotationally driven by a motor (not shown), the support plate 36 moves on the slide rail 38 in the left-right direction of the base 8 as shown by an arrow V in FIG. It has become.

  As shown in FIG. 9, the support plate 36 is provided with a plurality of brackets 40, 40,... For supporting the guide cylinders 35A, 35B, 35C. As many brackets 40 as the number of guide tubes 35A, 35B, 35C are provided. Each bracket 40 has a plate shape protruding upward from the upper surface of the support plate 36, and has a substantially L shape in a side view as shown in FIG. Between the lower end of the bracket 40 and the upper surface of the support plate 36, a slide rail 41 extending in the depth direction of the base 8 (left and right direction in FIG. 2) is provided. Are moved in the depth direction of the base 8 (in the direction of arrow S in FIG. 2).

  A plate member 42 extending in the vertical direction is fixed to the bracket 40, and the guide cylinders 35 </ b> A, 35 </ b> B, 35 </ b> C are fixed to the upper end portion of the plate member 42. The guide cylinders 35A, 35B, and 35C have horizontal axes that extend in the depth direction of the base 8 and are positioned at the same height as the axis of the piston pin insertion hole 100a of the piston 100 held on the pallet P. It has been. Further, the axes of the guide cylinders 35A, 35B, 35C and the piston pin insertion hole 100a are the same height as the axes of the magazines 16A to 16D.

  The inner diameters of the guide cylinders 35A, 35B, and 35C are set to be substantially the same as the inner diameter of the piston pin insertion hole 100a, and are therefore smaller than the outer diameter of the retaining ring 103 in the free state. Further, the inner diameters of the guide cylinders 35A, 35B, and 35C are set to be the same over both axial ends.

  The axial base ends (on the bracket 40 side) of the guide cylinders 35 </ b> A, 35 </ b> B, 35 </ b> C penetrate the bracket 40. As shown in FIG. 10, an inlet portion 35a for inserting the retaining ring 103 into the guide tubes 35A, 35B, 35C is formed at the base end portion of the guide tubes 35A, 35B, 35C. As shown in FIG. 12, an outlet portion 35b through which a retaining ring 103 in the guide cylinders 35A, 35B, and 35C exits is formed. As shown in FIG. 10, three notches 35c are formed on the periphery of the inlet portion 35a of the guide cylinders 35A, 35B, and 35C. These notches 35c are arranged at equal intervals in the circumferential direction, and are each sized to receive the projections 28c of the movable claw 28b. As shown in FIG. 12, a step portion 35 d in contact with the piston 100 is formed on the outer peripheral surface on the distal end side of the guide cylinders 35 </ b> A, 35 </ b> B, 35 </ b> C. Further, the tips of the guide cylinders 35A, 35B, and 35C are tapered.

  As shown in FIG. 2, a guide tube driving device 45 is provided below the mounting base 37. The guide cylinder driving device 45 is composed of an electric actuator, and includes a rod 45a and a cylinder portion 45b as shown in FIG. The cylinder portion 45 b of the guide tube driving device 45 is fixed to the mounting base 37 so that the axis of the rod 45 a faces the depth direction of the base 8. The expansion / contraction direction of the rod 45a is indicated by an arrow S in FIGS.

  As shown in FIG. 2, an engagement plate 46 extending in the vertical direction is provided on the tip surface of the rod 45a. On the other hand, the lower side of the plate member 42 projects downward from the support plate 36, and a slide rail 47 extending in the left-right direction of the base 8 between the lower portion of the plate member 42 and the upper portion of the engagement plate 46. The plate member 42 and the engagement plate 46 are engaged via the slide rail 47. With the support plate 36 moved to the right of the base 8 (only the guide tube is shown in phantom in FIG. 9), the plate member 42 and the engagement plate 46 are engaged via the slide rail 47, The plate member 42 and the engagement plate 46 are separated from each other when moved leftward (indicated by a solid line in FIG. 9). When the rod 45a is advanced in a state where the plate member 42 and the engagement plate 46 are engaged, the plate member 42 is guided toward the front side of the base 8 by the slide rail 41 together with the bracket 40 and the guide cylinders 35A, 35B, and 35C. When the rod 45a is moved backward, the plate member 42 moves to the back side of the base 8 together with the bracket 40 and the guide cylinders 35A, 35B, and 35C. In a state where the guide cylinders 35A, 35B, and 35C are moved in front of the base 8, as shown in FIG. 13, the outlet portions 35b of the guide cylinders 35A, 35B, and 35C are in contact with the peripheral edge of the piston pin insertion hole 100a. The step portions 35d of the guide cylinders 35A, 35B, and 35C come into contact with the piston 100.

  As shown in FIG. 1, four pushing devices 6 are arranged at intervals in the left-right direction of the base 8. As shown in FIG. 2, the push-in device 6 includes a mounting base 50 fixed to the upper surface of the base 8. Attached to the top. Each pushing device 6 includes three push rods 51A, 51B, and 51C (shown in FIG. 11) inserted into the guide cylinders 35A, 35B, and 35C, and a support device 54 that supports the push rods 51. . The push rods 51A, 51B, and 51C correspond to the three types of guide tubes 35A, 35B, and 35C, and the push rods 51A, 51B, and 51C are inserted into the guide tubes 35A, 35B, and 35C, respectively. . The interval between the four pushing devices 6 corresponds to the interval between the pistons 100 held on the pallet P.

  The support device 54 includes a feeding device 55 and a rotation mechanism 56 that rotates the push rods 51A to 51C. The screw rod 55 a of the feeding device 55 is arranged so as to extend horizontally in the depth direction of the base 8 and is pivotally supported with respect to the mounting base 50. A motor 55c is connected to one end of the screw rod 55a. A rotation mechanism 56 is fixed to the moving portion 55b that is screwed into the screw rod 55a. Accordingly, the rotation mechanism 56 moves in the depth direction (arrow T direction) of the base 8 by the rotation of the screw rod 55a driven by the motor 55c.

  The rotating mechanism 56 includes a rotating shaft 56a extending in the same direction as the screw rod 55a, a motor 56b connected to one end of the rotating shaft 56a, and a circular rotating plate 56c fixed to the other end of the rotating shaft 56a. I have. The base ends of the three push rods 51A, 51B and 51C are fixed to the surface of the rotating plate 56c opposite to the rotating shaft 56a. As shown in FIG. 11, the push rods 51A, 51B, 51C are spaced apart from each other at an equal distance in the radial direction from the rotation center X of the rotating plate 56c, and are arranged at equal intervals in the circumferential direction.

  As shown in FIG. 12, a stepped portion 51a is formed on the outer peripheral surface on the distal end side of the push rods 51A, 51B, 51C so that the distal end portion is thinner than the proximal end side. The front ends of the push rods 51A, 51B, 51C are tapered. The outer diameters of the distal ends of the push rods 51A, 51B, 51C are set slightly smaller than the inner diameter of the retaining ring 103, and the distal ends are inserted into the retaining ring 103. The outer diameter of the push rods 51A, 51B, 51C on the base end side with respect to the stepped portion 51a is set larger than the inner diameter of the retaining ring 103, and the retaining ring 103 is inserted at the distal end side of the pushing rods 51A, 51B, 51C. In such a state, it is fitted to the stepped portion 51a. Further, the motor 56b of the rotation mechanism 56 can stop the rotation plate 56c at an arbitrary rotation angle (the rotation direction is indicated by an arrow R in FIG. 2). The axis of the push rod 51A located below the rotating plate 56c is made to coincide with the axis of the guide cylinder 35A.

  Next, the operation of the assembling apparatus 1 configured as described above will be described. First, the pallet P holding the connected body of the piston 100 and the connecting rod 101 is transported to the assembly position by the pallet transport device 2. Then, the moving mechanism 13b of the piston fixing device 13 is operated to bring the contact member 13a into contact with the side surface of the piston 100 as shown in FIG. Accordingly, the piston 100 is fixed so as not to move by being sandwiched between the contact member 13a and the piston holding portion Pb of the pallet P.

  On the other hand, the retaining ring 103 is taken out from the magazine 16A in which the retaining ring 103 corresponding to the piston 100 held on the pallet P is loaded and set in the guide cylinder 35A of the guide device 5. That is, first, the guide cylinder 35A of the guide device 5 is moved to the left side of the slide rail 38 by the feeding device 39. Then, the gripping portion 20 is moved to the left side of the base 8 by the feeding device 24 of the retaining ring conveyance device 4 and is disposed so as to face the outlet portion 16b of the magazine 16A as shown in FIG. At this time, the rod 29 a of the gripping part driving device 29 is moved backward so that the movable claws 28 b, 28 b, 28 b are positioned radially outward so that these protrusions 28 c, 28 c, 28 c do not contact the retaining ring 103.

  Thereafter, the gripping portion 20 is moved in the direction approaching the outlet portion 16b of the magazine 16A (in the direction of the arrow Q in FIG. 3) by the slide cylinder device 25 of the retaining ring transport device 4, and the protrusions 28c, 28c, 28c is put into the notch 16b.

  And if the rod 29a of the holding | grip part drive device 29 is advanced, the movable nail | claw 28b of the holding device 28 will move to radial inside. As a result, the projections 28c, 28c, 28c in the cutout portion 16c of the magazine 16A move so as to come into contact with the three outer peripheral portions of the retaining ring 103, and as shown in FIG. Due to the further movement of 28b, 28b, the retaining ring 103 is elastically deformed in the reduced diameter direction and is held by the holding part 20. Due to the deformation of the retaining ring 103, the retaining ring 103 can be separated from the inner peripheral surface of the magazine 16A and get over the stopper 16d. The amount of diameter reduction of the retaining ring 103 is set to be slightly smaller than the inner diameter of the guide tube 35A.

  After the retaining ring 103 is gripped, when the gripping device 28 is moved away from the magazine 16A by the slide cylinder device 25, the retaining ring 103 leaves the outlet 16b of the magazine 16A while being gripped by the gripping device 28. Then, the gripping device 28 is moved to the right of the base 8 by the feeding device 24 so as to face the inlet portion 35a of the guide tube 35A. Thereafter, the gripping device 28 is moved by the slide cylinder device 25 in a direction approaching the inlet portion 35a of the guide tube 35A, and the retaining ring 103 is inserted into the guide tube 35A from the inlet portion 35a. When the rod 29a of the gripping unit driving device 29 is retracted after the retaining ring 103 is inserted, the movable claw 28b of the gripping device 28 moves radially outward to move away from the retaining ring 103, and the projection 28c is formed on the guide tube 35A. It goes out through the notch 35c. Then, as shown in FIG. 10, the retaining ring 103 tries to recover, and the outer peripheral portion thereof is in pressure contact with the inner peripheral surface of the guide cylinder 35A, so that the retaining ring 103 moves unexpectedly with respect to the guide cylinder 35A. There is no. As a result, the retaining ring 103 is held in a predetermined posture with the diameter reduced.

  In this way, the retaining ring 103 loaded in the magazine 16A is set on the guide cylinder 35A. This is repeated and the retaining ring 103 is set on all the four guide cylinders 35A. When setting the retaining ring 103, since the axis of the magazine 16A and the axis of the guide cylinder 35A are located at the same height, it is necessary to move the gripping portion 20 that grips the retaining ring 103 in the vertical direction. Therefore, the structure can be simplified.

  After the retaining ring 103 is set on the guide cylinder 35, the guide cylinder 35A is moved to the right by the feeding device 39 of the guide apparatus 5 until the axis line thereof coincides with the piston pin insertion hole 100a. Then, as shown in FIG. 2, the plate member 42 is engaged with the engagement plate 46 of the guide tube driving device 45 via the slide rail 47. When the rod 45a of the guide tube driving device 45 is advanced in this engaged state, the guide tube 35 moves to the near side of the base 8, that is, the side approaching the piston pin insertion hole 100a, and FIG. As shown, the step 35d at the tip of the guide tube 35 fits in a corresponding portion of the piston 100, and the outlet 35b of the guide tube 35 contacts the peripheral edge of the piston pin insertion hole 100a.

  Thereafter, the rotating plate 56c is rotated by the rotating mechanism 56 of the pushing device 6 until the push bar 51A comes down. Then, when the push rods 51A, 51B, 51C are advanced by the feeding device 55 of the push-in device 6, the push rod 51A is inserted into the guide tube 35A from the inlet portion 35a. Thereby, the front-end | tip part of the push rod 51 is inserted in the retaining ring 103 currently hold | maintained inside the guide cylinder 35A, and the retaining ring 103 fits into the level | step-difference part 51a of the push rod 51A, and is stabilized.

  In this state, as shown in FIG. 14, when the push rod 51 is further advanced, the retaining ring 103 moves to the front end side in the guide tube 35A, and eventually comes out of the outlet portion 35b and inserts the piston pin. It is pushed into the hole 100a. The retaining ring 103 pushed into the piston pin insertion hole 100a is fitted into the groove 100b by a restoring force. In this way, the retaining ring 103 is assembled to the piston pin insertion hole 100a. After assembly, the push rod 51A is moved backward by the feeding device 55 and the guide tube 35A is moved backward by the guide tube driving device 45. And after moving the contact member 13a of the piston fixing device 13 in the direction away from the piston 100, the pallet P is carried out.

  When a different type of piston 100 is carried in, the retaining ring 103 that matches the piston 100 is taken out from the other magazines 16B and 16C and set in the other guide cylinders 35B and 35C as described above. Then, the rotation plate 56c is rotated by the rotation mechanism 56 of the push-in device 6 so that the push rods 51B and 51C corresponding to the guide cylinders 35B and 35C in which the retaining ring 103 is set come down. Then, the push rods 51B and 51C are advanced to attach the retaining ring 103 to the piston pin insertion hole 100a.

  As described above, according to the assembling apparatus 1 according to this embodiment, the retaining ring 103 can be pushed into the piston pin insertion hole 100a after being held by the guide cylinder 35A in a reduced diameter state. As in the case of using a tapered guide hole, it is possible to prevent the retaining ring 103 from being greatly contracted while being pushed in, and to prevent the retaining ring 103 from being inclined before being assembled to the piston pin insertion hole 100a. The ring 103 can be assembled smoothly. Thereby, damage to the retaining ring 103 and the assembling apparatus 1 can be suppressed, and the retaining ring 103 can be reliably assembled to the piston pin insertion hole 100a.

  In addition, since the movable claw 28b is moved in the radial direction of the retaining ring 103 by the grip portion driving device 29, a plurality of types of retaining rings 103 having different outer diameters can be gripped, and the diameter of the retaining ring 103 is reduced. The amount can be changed. As a result, the types of retaining rings 103 that can be assembled by the assembling apparatus 1 can be increased so that the retaining rings 103 can be assembled to different types of pistons 100, and the versatility of the assembling apparatus 1 can be improved. it can.

  In addition, since the retaining ring 103 held on the guide cylinder 35A is moved toward the outlet portion 35b by the push rod 51A, the retaining ring 103 is guided to the piston pin insertion hole 100a by the guide cylinder 35A and securely assembled. Can do.

  Further, the retaining ring 103 loaded in the magazine 16A can be automatically conveyed to the guide cylinder 35A and then assembled to the piston pin insertion hole 100a.

  In addition, although this embodiment demonstrated the case where the retaining ring 103 was assembled | attached to the piston pin insertion hole 100a, this invention is not restricted to this, A retaining ring is attached to the assembly | attachment site | part provided in various components. It can be applied when assembling.

  Further, the number of movable claws 28b is not limited to three.

  Moreover, although the case where the retaining ring 103 was assembled | attached to a hole was demonstrated in the said embodiment, although this invention is not shown in figure, it can be applied also when assembling the retaining ring 103 to a axis | shaft (assembly part). In this case, first, the protrusions 28c, 28c, 28c of the movable claws 28b, 28b, 28b of the gripping device 28 are disposed inside the retaining ring 103, and then the movable claws 28b, 28b, 28b are moved radially outward. By doing so, the diameter of the retaining ring 103 is increased until it becomes slightly larger than the diameter of the shaft. The outer diameter of the guide cylinder (not shown) is set to be substantially the same as the outer diameter of the shaft, and the retaining ring 103 in the expanded state is temporarily held on the outer peripheral surface of the guide cylinder. Then, since the retaining ring 103 is pressed against the outer peripheral surface of the guide cylinder in an attempt to restore, it does not move unexpectedly. After that, after moving the guide tube so as to coincide with the shaft, the retaining ring 103 is formed on the outer peripheral surface of the shaft by pushing the retaining ring 103 toward the shaft side with, for example, a cylindrical member. Fits into the groove. Also in this case, since it is not necessary to greatly deform while pushing the retaining ring 103, it can be assembled smoothly.

  As described above, the assembling apparatus according to the present invention is suitable for assembling a retaining ring to a hole or a shaft.

It is a top view of the assembly | attachment apparatus which concerns on this invention. It is a Y arrow line view of FIG. It is a figure which shows the cross-section of a magazine with which the retaining ring was loaded, and the holding apparatus. It is a top view of a retaining ring conveyance apparatus. It is a side view of a retaining ring conveyance apparatus. It is a side view which expands and shows the holding part vicinity of a retaining ring conveyance apparatus. It is a perspective view of a gripping device. It is the front view which looked at the grasping device from the movable nail side, (a) shows the state where the retaining ring was reduced in diameter, and (b) shows the state which put the retaining ring in the free state between the movable nail. It is shown. It is a top view of a guide apparatus. It is sectional drawing of the base end side of a guide cylinder. It is the figure which looked at the push rod attached to the rotating plate from the front end side. It is a side view which shows the positional relationship of the pallet in a state before attaching a retaining ring, a guide cylinder, and a push rod. FIG. 13 is a view corresponding to FIG. 12 in a state where the guide cylinder is brought into contact with the piston. FIG. 13 is a view corresponding to FIG. 12 in a state where the push rod is inserted into the guide tube. It is a figure explaining the connection structure of a piston and a connecting rod.

Explanation of symbols

1 Assembly device 4 Retaining ring transport device 6 Pushing device (pushing part)
16A-16D magazine (loading section)
20 gripping portion 21 moving device 28b movable claw 29 gripping portion driving device (claw driving device)
35A-35C Guide tube (holding part)
35a Inlet part 35b Outlet part 51A-51C Push rod (pushing member)
55 Feeding device (pushing member driving device)
100 piston (object to be assembled)
100a Piston pin insertion hole (assembly part)
101 Connecting rod 103 Retaining ring

Claims (7)

An assembly device for assembling a retaining ring to an assembly object,
A gripping part for gripping the retaining ring in a deformed state so as to correspond to the assembly part of the assembly object;
A holding portion for holding a retaining ring gripped by the grip portion;
An assembling apparatus, comprising: a pushing portion that pushes the retaining ring held by the holding portion to an assembling portion of the object to be assembled. The assembly apparatus according to claim 1,
The gripping portion is configured to grip in a state where the diameter of the retaining ring is expanded,
The holding device is configured to hold the retaining ring gripped by the gripping portion in an expanded state. The assembly apparatus according to claim 1,
The gripping portion is configured to grip the retaining ring in a reduced diameter state,
The holding device is configured to hold the retaining ring gripped by the gripping portion in a reduced diameter state. The assembling apparatus according to claim 3,
The gripping portion includes a plurality of claws that are in contact with each of the circumferentially separated portions of the retaining ring, and a claw driving device that moves the claws in the radial direction of the retaining ring. apparatus. The assembling apparatus according to claim 3 or 4,
The holding part has a cylindrical shape,
An inlet portion into which a retaining ring in a reduced diameter is inserted is formed at one end in the longitudinal direction of the holding portion, and an outlet portion of the retaining ring is formed at the other end.
The assembling apparatus, wherein the pushing portion includes a pushing member inserted from an inlet portion of the holding portion and a pushing member driving device that moves the pushing member in a longitudinal direction of the holding portion. In the assembling apparatus according to any one of claims 3 to 5,
A loading section loaded with a number of retaining rings;
An assembling apparatus comprising: a moving device that moves the gripping unit between the loading unit and the holding unit. The assembly apparatus according to claim 6,
A plurality of loading sections each loaded with different types of retaining rings;
An assembling apparatus comprising: a plurality of holding portions that respectively hold the retaining rings.

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