JP2019188522A - Snap ring attachment device - Google Patents

Abstract

To provide a snap ring attachment device which can attach a snap into an attachment groove formed at a hole internal peripheral face of a workpiece without damaging the hole internal peripheral face of the workpiece.SOLUTION: A snap ring attachment device comprises: a positioning mechanism 5 for whirl-stopping a snap ring 1 by inserting a whirl-stop member 6 into a split 2, and positioning the snap ring to a regulation position; a diameter-contraction mechanism 8 for making the snap ring 1 which is positioned in the regulation position engaged therewith, and contracting a diameter of the snap ring smaller than a diameter of a hole 9 of a workpiece W; and a transport mechanism 19 for transporting the snap ring 1 which is contracted in a dimension at the diameter-contraction mechanism 8 to an attachment groove 9A by inserting it into the hole 9 of the workpiece W. In the diameter-contraction mechanism 8, a pair of grip members 10A, 10B having engagement parts 11A, 11B engaged with the engagement hole 9 of the snap ring 1 are arranged so as to be turnable and rotatable, and both the grip members 10A, 10B contract the diameter of the snap ring 1 by making the engagement parts 11A, 11B approximate each other by a turning operation, and expand the diameter of the snap ring 1 by making the engagement parts 11A, 11B separate from each other.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a retaining ring mounting device that mounts a C-shaped retaining ring having a split opening on a mounting groove formed on an inner peripheral surface of a workpiece hole.

  This type of retaining ring mounting device conveys a retaining ring (snap ring) cut out from the magazine along the conveying path, changes the posture from the horizontal direction to the vertical direction, and reduces the reduced diameter guiding path by free fall. Lead to the radial start position. The retaining ring guided to the diameter reduction start position is pressed by the pressing shaft and moved below the diameter reduction guide path to reduce the diameter, and is held in the insertion cylinder in a reduced diameter state. The retaining ring held in this reduced diameter state is pushed out by the insertion shaft, inserted through the hole of the workpiece (piston) and inserted into the mounting groove, and the mounting is completed by elastic return of the retaining ring itself. Then, when the retaining ring moves along the reduced diameter guide path, a rotation restricting pin is inserted into the retaining ring so that the position of the dividing ring does not shift.

JP 2002-346855 A

  However, in such a conventional retaining ring mounting device, when the retaining ring is inserted through the hole of the workpiece, the retaining ring is brought into sliding contact with the inner peripheral surface of the hole of the workpiece by the elastic restoring force in the diameter increasing direction of the retaining ring itself. For this reason, the inner peripheral surface of the workpiece may be damaged.

  The subject of this invention is providing the retaining ring mounting apparatus which can mount | wear with the mounting groove formed in the hole internal peripheral surface of the workpiece | work without damaging the hole internal peripheral surface of a workpiece | work.

In order to achieve this problem, the present invention has taken the following measures. That is,
A retaining ring mounting device for mounting a C-shaped retaining ring having engagement holes on both sides of a partitioning hole in a mounting groove formed on the inner peripheral surface of the hole of the workpiece, and inserting a detent member into the partitioning hole A positioning mechanism that stops the retaining ring and positions it at a specified position, a diameter-reducing mechanism that engages the retaining ring that is positioned at the specified position and reduces the diameter to a smaller diameter than the hole of the workpiece, and a stopper that is reduced in diameter by the diameter-reducing mechanism And a conveyance mechanism that conveys the wheel through the hole of the work and conveys it to the mounting groove, and the diameter reducing mechanism is capable of freely rotating a pair of gripping members having engagement portions at the tips that engage with the engagement holes of the retaining ring. The retaining ring is characterized in that the gripping members reduce the diameter of the retaining ring by moving the engaging portions closer to each other by a rotating operation, and also increase the diameter of the retaining ring by separating the engaging portions from each other. That is the mounting device.

  In this case, the pair of gripping members are formed in a rod shape and are disposed to face each other, and have a contact portion that contacts the cam member at a root facing the tip having the engagement portion, and between the tip and the root. A cam member is movably provided around an intermediate portion, and abutting portions are provided close to and away from each other according to the movement of the cam member. The engaging portion may be approached by separating the contact portion. In addition, a setting unit that sets a maximum movement value of the cam member that moves the abutting portions in a direction away from each other may be provided.

  As described above in detail, the invention described in claim 1 includes a positioning mechanism that inserts a detent member into the slot to prevent the retaining ring from rotating and positions the retaining ring at a specified position, and a retaining ring positioned at the defined position. A diameter reducing mechanism that engages and reduces the diameter of the workpiece to a smaller diameter than the hole of the workpiece, and a conveyance mechanism that inserts a retaining ring reduced in diameter by the diameter reducing mechanism through the hole of the workpiece and conveys it to the mounting groove. A pair of gripping members having engaging portions that engage with the retaining holes of the retaining ring at the tip are provided so as to be rotatable, and both gripping members approach the engaging portions to each other by the rotating operation to contract the retaining ring. The retaining ring is spaced apart from each other and the retaining ring is enlarged. For this reason, a pair of gripping members of the diameter-reducing mechanism are rotated, and a retaining ring whose diameter is smaller than the hole of the work by bringing the engaging parts closer to each other is mounted by the transport mechanism without hitting the inner peripheral surface of the work hole. Since it can be conveyed to the groove, the retaining ring can be mounted in the mounting groove formed on the inner peripheral surface of the workpiece without damaging the inner peripheral surface of the workpiece.

  According to a second aspect of the present invention, the pair of gripping members are formed in a rod shape and are arranged to face each other, and have a contact portion that contacts the cam member at the root facing the tip having the engagement portion. The cam part is provided so as to be movable around the intermediate part between the base and the base, and the contact parts are provided close to and away from each other according to the movement of the cam member. The engaging portion was separated by approaching, and the engaging portion was approached by separating the contact portion. For this reason, the pair of gripping members are rotated by the movement of the cam member, and the engaging portions are moved closer to and away from each other. Therefore, the retaining ring for engaging the engaging portion with the engaging hole can be surely reduced in diameter. The retaining ring having a small diameter can be restored by expanding the diameter.

  According to a third aspect of the present invention, there is provided a setting portion for setting a maximum movement value of the cam member that moves the contact portions in directions away from each other. For this reason, since the engaging portion can be reliably approached by the movement of the cam member to the maximum movement value, the retaining ring can be surely made smaller in diameter than the hole of the workpiece.

1 is a front view of a retaining ring mounting device according to an embodiment of the present invention, partly in cross section. It is a top view of FIG. It is a right view of FIG. It is an enlarged view of a diameter reducing mechanism showing a main part of one embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 to 3, reference numeral 1 denotes a C-shaped retaining ring, which has engagement holes 3A and 3B on both sides in the circumferential direction of the split slot 2, and an inner peripheral surface of a hole 9 of a workpiece W fixed by a jig (not shown). It is mounted in the mounting groove 9A formed in the above. Reference numeral 4 denotes a slide member, which is provided so as to be movable in the horizontal direction (left and right direction in FIGS. 1 and 2), and has a recess 4A that engages with the outer periphery of the retaining ring 1 at the tip. In the holding position at the left end shown in FIGS. 1 and 2, the slide member 4 conveys the retaining ring 1 engaged with the concave portion 4A at the tip to the positioning mechanism 5, and a root 4B that is opposite to the tip in the horizontal direction. The other retaining ring 1 is mounted on. Then, the slide member 4 engages the other retaining ring 1 placed on the root 4B with the recess 4A at the tip by the operation to the take-out position at the right end in FIGS. The slide member 4 conveys the retaining rings 1 placed on the root 4B one by one to the positioning mechanism 5 one by one by repeating the operation between the holding position and the take-out position. A new retaining ring is placed on the root 4B one by one from a magazine (not shown).

  The positioning mechanism 5 is disposed to face the concave portion 4A of the slide member 4, and includes a rotation preventing member 6 and a pair of arm members 7A and 7B. The detent member 6 is inserted into the split ring 2 of the retaining ring 1 engaged with the recess 4 </ b> A of the slide member 4 so as to freely advance and retract, and the detent ring 1 is prevented from rotating by being inserted into the diverter 2. The arm members 7A and 7B are arranged symmetrically on both sides of the rotation prevention member 6 so as to be rotatable, and the retaining ring 1 which is prevented from being rotated by the rotation prevention member 6 is positioned at a predetermined position. In detail, the arm members 7A and 7B are provided so as to be rotatable about a middle portion in the longitudinal direction. The arm members 7A and 7B are opposed to each other at the two positions facing each other in the circumferential direction by about 90 °. The front end is brought into contact with and held on the outer peripheral surface of the retaining ring 1 to position the retaining ring 1 at a specified position. Then, the positioning mechanism 5 releases the positioning of the retaining ring 1 by separating the tip from the outer peripheral surface of the retaining ring 1 by the rotation of the arm members 7A and 7B.

  Reference numeral 8 denotes a diameter reducing mechanism, which is provided with a pair of gripping members 10A, 10B formed in a bar shape so as to be freely rotatable, and engages with a retaining ring 1 positioned at a specified position by a positioning mechanism 5 so as to have a smaller diameter than the hole 9 of the workpiece W. Reduce to diameter. As shown in FIG. 4, the gripping members 10 </ b> A and 10 </ b> B are provided with detachable and replaceable engaging members 12 </ b> A and 12 </ b> B projecting engaging portions 11 </ b> A and 11 </ b> B at their tips, and the engaging portions 11 </ b> A and 11 </ b> B are retaining rings 1. The engagement holes 3A and 3B are engaged. The gripping members 10A and 10B are rotatably provided with roller members 14A and 14B as contact portions at the bases facing the front ends having the engaging portions 11A and 11B, and a fulcrum 15A at an intermediate portion between the front ends and the bases. , 15B, and provided so as to be rotatable about fulcrums 15A, 15B. 16 is a substantially trapezoidal cam member having an inclined surface 16A that abuts on the roller members 14A and 14B and contracts downward from above, and is disposed above in the vertical direction of the gripping members 10A and 10B. It is fixed to the piston rod 17A and is provided so as to be movable in the vertical direction. In the state shown in FIG. 4, the cam member 16 is at an intermediate position in the vertical direction. At this intermediate position, after the retaining ring 1 is mounted in the mounting groove 9 </ b> A on the inner peripheral surface of the hole 9 of the workpiece W, the engaging hole 3 </ b> A of the retaining ring 1. 3B, the engaging portions 11A and 11B of the gripping members 10A and 10B are extracted and the engagement is released. In the cam member 16, the roller members 14A and 14B approach each other at the upper end position above the intermediate position in FIG. 4, and the engaging portions 11A and 11B are separated from each other by this approach, and the engaging portions 11A and 11B. Is engaged with the engagement holes 3A and 3B of the retaining ring 1 positioned by the positioning mechanism 5. Further, in the cam member 16, at the lower end position below the intermediate position in FIG. 4, the roller members 14A and 14B are separated from each other, and the engagement portions 11A and 11B approach each other due to this separation, and the engagement portion 11A. , 11B is engaged with the engagement holes 3A and 3B, and the diameter of the retaining ring 1 is reduced to a smaller diameter than the hole 9 of the workpiece W. B is a spring interposed between the pair of gripping members 10A and 10B, and applies a spring force in a direction in which the pair of engaging portions 11A and 11B are separated from each other. Reference numerals 18A and 18B are regulating members arranged outside the gripping members 10A and 10B, and set the maximum values of the engaging portions 11A and 11B that are in contact with the outside of the gripping members 10A and 10B. As shown in FIGS. 1 and 3, T is a setting portion for setting the maximum value of movement of the cam member 16 to the lower end position, and is in contact with the piston rod 17A of the cylinder 17 so that the roller members 14A and 14B are separated from each other. Set the move to.

  Reference numeral 19 denotes a transport mechanism that transports the retaining ring 1 whose diameter has been reduced by the diameter reducing mechanism 8 through the hole 9 of the workpiece W to the mounting groove 9A, and a horizontal moving portion that allows the diameter reducing mechanism 8 to move horizontally in the horizontal direction. 20 and a vertical movement unit 21 that allows the diameter reducing mechanism 8 to move up and down in the vertical direction. The horizontal moving part 20 arranges the rodless cylinder 22 and the guide member 23 in the horizontal direction substantially in parallel, and guides the base 24 by the guide member 23 and moves to the left and right in FIG. 1 and FIG. Make it free. In the state where the base 24 is located at the left end shown in FIGS. 1 and 2, the horizontal movement unit 20 is located on the workpiece W in the state where the diameter reducing mechanism 8 is located, and in the state where the base 24 is located at the right end. The diameter-reducing mechanism 8 is positioned on the retaining ring 1 positioned at the specified position by the positioning mechanism 5. The vertical moving unit 21 is configured by attaching a guide cylinder 25 to a base 24. The guide cylinder 25 fixes a cylinder body 27 to a guide body 26 attached to the base 24 in the vertical direction, and projects a piston rod 28 downward from the cylinder body 27 so as to be movable in the vertical direction. The piston rod 28 has a mounting plate 29 attached to the lower end, the diameter reducing mechanism 8 is placed and fixed on the mounting plate 29, and the gripping members 10 </ b> A and 10 </ b> B of the diameter reducing mechanism 8 protrude downward from the mounting plate 29. Two rods 30 </ b> A and 30 </ b> B are erected on the mounting plate 29 via piston rods 28 at symmetrical positions, and the rods 30 </ b> A and 30 </ b> B are guided by the guide body 26 and protrude upward. The upper ends of the rods 30A and 30B are connected by an upper plate 31. The upper plate 31 is provided with a position sensor 32 that detects the vertical position of the piston rod 28. In the state where the base 24 is located at the left end, the vertical moving portion 21 moves the mounting plate 29 to the lower end and attaches the engaging portions 11A and 11B of the gripping members 10A and 10B in the hole 9 of the workpiece W. While being positioned at substantially the same position in the vertical direction as the groove 9A, the mounting plate 29 is moved to the upper end, and the engaging portions 11A, 11B of the gripping members 10A, 10B are positioned above the workpiece W in the vertical direction. Further, in a state where the base 24 is positioned at the right end, the vertical moving portion 21 moves the mounting plate 29 to the lower end and moves the engaging portions 11A and 11B of the gripping members 10A and 10B to the specified positions by the positioning mechanism 5. Is engaged with the engaging holes 3A and 3B of the retaining ring 1 positioned at the upper end position of the mounting plate 29 in a state where the base 24 is positioned at the left end, and at an upper end substantially the same position in the vertical direction. Moving.

Next, the operation of this configuration will be described.
1 to 3 show a state in which one retaining ring 1 is mounted in the mounting groove 9A of the workpiece W. FIG. In this state, the other one retaining ring 1 is positioned and held at the specified position by the positioning mechanism 5, and the other one retaining ring 1 is placed on the root 4 </ b> B of the slide member 4. The transport mechanism 19 has the base 24 positioned at the left end by the horizontal moving unit 20 and the mounting plate 29 positioned at the lower end by the vertical moving unit 21, and the diameter reducing mechanism 8 is the engagement of the gripping members 10 </ b> A and 10 </ b> B. The joint portions 11A and 11B are engaged with the engagement holes 3A and 3B of the retaining ring 1 mounted in the mounting groove 9A of the workpiece W.

  In this state, when the mounting plate 29 is moved to the upper end by the vertical moving portion 21 of the transport mechanism 19, the engaging portions 11 </ b> A and 11 </ b> B of the gripping members 10 </ b> A and 10 </ b> B are extracted upward from the hole 9 of the workpiece W. Is replaced with the next new workpiece W. When the base 24 is moved to the right end by the horizontal moving unit 20 of the transport mechanism 19, the diameter reducing mechanism 8 is positioned on the other retaining ring 1 positioned at the specified position by the positioning mechanism 5. In this state, the diameter-reducing mechanism 8 moves the cam member 16 to the upper upper end position in FIG. 4 to separate the engaging portions 11A and 11B from each other, and determines the distance between the engaging portions 11A and 11B. The distance between the engagement holes 3A and 3B of the other retaining ring 1 positioned at the specified position by the mechanism 5 is made substantially the same.

  In this state, when the mounting plate 29 is moved to the lower end by the vertical moving portion 21 of the transport mechanism 19, the engaging portions 11A and 11B of the gripping members 10A and 10B are engaged with the engaging holes 3A and 3B of the other retaining ring 1. Engage with. In this state, the positioning mechanism 5 moves the anti-rotation member 6 leftward in FIG. 2 to retreat from the split 2 of the other one retaining ring 1, and rotates the arm members 7A and 7B to move the distal end. The part is separated from the outer peripheral surface of the other one retaining ring 1 and the positioning of the other retaining ring 1 is released. The diameter reducing mechanism 8 moves the cam member 16 to the lower lower end position in FIG. 4 so that the engaging portions 11A and 11B approach each other, and the other retaining ring 1 has a smaller diameter than the hole 9 of the new workpiece W. Reduce to diameter.

  Then, the other retaining ring 1 having a diameter smaller than that of the hole 9 of the new workpiece W is moved to the upper end by the vertical moving portion 21 of the transport mechanism 19, and the other retaining ring moved to the upper end is moved. The wheel 1 is moved to the left end by the horizontal moving unit 20 of the transport mechanism 19, and the other retaining ring 1 moved to the left end is moved to the lower end by the vertical moving unit 21 of the transport mechanism 19. The new workpiece W is positioned substantially at the same position in the vertical direction as the mounting groove 9 of the new workpiece W. Then, the diameter reducing mechanism 8 moves the cam member 16 to the upper intermediate position in FIG. 4 to separate the engaging portions 11A and 11B of the gripping members 10A and 10B from each other, and elastically makes the other retaining ring 1 elastic. The diameter is expanded upon return, and the new workpiece W is mounted in the mounting groove 9.

  Then, the slide member 4 operates to the take-out position at the right end in FIGS. 1 and 2, engages another retaining ring 1 placed on the root 4 </ b> B with the recess 4 </ b> A at the tip, and further The retaining ring 1 is operated to the holding position at the left end in FIGS. 1 and 2. Further, the other retaining ring 1 is positioned at a specified position by the positioning mechanism 5.

  In such an operation, the positioning member 5 is inserted into the slot 2 to stop the retaining ring 1 and positioned at the specified position, and the retaining ring 1 positioned at the defined position is engaged with the positioning mechanism 5. A diameter reducing mechanism 8 for reducing the diameter to a smaller diameter than the hole 9 and a conveying mechanism 19 for inserting the retaining ring 1 reduced in diameter by the diameter reducing mechanism 8 through the hole 9 of the workpiece W and conveying it to the mounting groove 9A are provided. The mechanism 8 is provided with a pair of gripping members 10A and 10B having engaging portions 11A and 11B that engage with the engaging holes 3A and 3B of the retaining ring 1 at the distal end, and the gripping members 10A and 10B are rotated. The engaging portions 11A and 11B are moved closer to each other by a moving operation to reduce the diameter of the retaining ring 1, and the engaging portions 11A and 11B are separated from each other to increase the diameter of the retaining ring 1. For this reason, the retaining ring 1 having a smaller diameter than the hole 9 of the workpiece W by rotating the pair of gripping members 10A and 10B of the diameter reducing mechanism 8 so that the engaging portions 11A and 11B are close to each other is arranged on the workpiece W. Since the transport mechanism 19 can transport the mounting ring 9A without hitting the inner peripheral surface of the hole 9, the retaining ring 1 is mounted on the inner peripheral surface of the hole 9 of the workpiece W without damaging the inner peripheral surface of the hole 9 of the workpiece W. It can be mounted in the groove 9A.

  Further, the pair of gripping members 10A and 10B are formed in a rod shape and are arranged to face each other, and have roller members 14A and 14B that abut the cam member 16 at the roots facing the tips having the engaging portions 11A and 11B. Are provided so as to be pivotable about the fulcrums 15A and 15B in the middle between the base and the base, and the cam member 16 is movably provided. The roller members 14A and 14B approach each other according to the movement of the cam member 16. The engaging portions 11A and 11B are separated by the approach of the roller members 14A and 14B, and the engaging portions 11A and 11B are approached by the separation of the roller members 14A and 14B. For this reason, the pair of gripping members 10A and 10B are rotated by the movement of the cam member 16, and the engaging portions 11A and 11B are moved closer to and away from each other. Therefore, the engaging portions 11A and 11B are moved to the engaging holes 3A and 3B. The retaining ring 1 that engages with can be reliably reduced in diameter or can be restored by expanding the diameter of the retaining ring that has been reduced in diameter.

  Further, a setting unit T is provided for setting a maximum movement value of the cam member 16 that moves the roller members 14A and 14B in a direction in which they are separated from each other. For this reason, since the engaging portions 11A and 11B can be reliably approached by the movement of the cam member 16 to the maximum movement value, the retaining ring 1 can be reliably made smaller in diameter than the hole 9 of the workpiece W.

  In the above-described embodiment, the positioning mechanism 5 is provided with a pair of arm members 7A and 7B that abut on and hold the outer peripheral surface of the retaining ring 1. However, the pair of arm members is necessary. It is not necessary to provide it accordingly. Further, the diameter reducing mechanism 8 rotates the pair of gripping members 10A and 10B by the movement of the cam member 16, but the base of the pair of gripping members is urged by the elastic member in a direction away from each other. Of course, the roots of the pair of gripping members may be pressed from the horizontal direction in a direction approaching each other against the biasing of the members.

1: Retaining ring 2: Split port 3A, 3B: Engagement hole 5: Positioning mechanism 8: Diameter reduction mechanism 9: Hole
9A: Mounting groove 10A, 10B: Holding member 11A, 11B: Engaging portion 19: Conveying mechanism

Claims (3)

  A retaining ring mounting device for mounting a C-shaped retaining ring having engagement holes on both sides of a partitioning hole in a mounting groove formed on the inner peripheral surface of the hole of the workpiece, and inserting a detent member into the partitioning hole A positioning mechanism that stops the retaining ring and positions it at a specified position, a diameter-reducing mechanism that engages the retaining ring that is positioned at the specified position and reduces the diameter to a smaller diameter than the hole of the workpiece, and a stopper that is reduced in diameter by the diameter-reducing mechanism And a conveyance mechanism that conveys the wheel through the hole of the work and conveys it to the mounting groove, and the diameter reducing mechanism is capable of freely rotating a pair of gripping members having engagement portions at the tips that engage with the engagement holes of the retaining ring. The retaining ring is characterized in that the gripping members reduce the diameter of the retaining ring by moving the engaging portions closer to each other by a rotating operation, and also increase the diameter of the retaining ring by separating the engaging portions from each other. Mounting device.   The pair of gripping members are formed in a rod shape and are arranged opposite to each other, and have a contact portion that contacts a cam member at a base opposite to the tip having the engaging portion, and an intermediate portion between the tip and the base The cam member is movably provided around the center, and the contact portions are provided close to and away from each other according to the movement of the cam member, and the engagement portions are separated by the approach of the contact portion. In addition, the retaining ring mounting device according to claim 1, wherein the engagement portion approaches the contact portion by separating the contact portion. The retaining ring mounting device according to claim 2, further comprising a setting unit configured to set a maximum movement value of the cam member that moves the contact portions in a direction away from each other.

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