JP2010012559A - Snap ring contraction device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To contract a snap ring smoothly uniformly in a snap ring contraction device. <P>SOLUTION: When the snap ring W is mounted at a recess 22 of a turning table 5 and a link plate 3 and the turning table 5 are turned by an air cylinder 10, a roller follower is moved along the cam groove 21 of the turning table 5 and nine slide blocks 17 and contraction pieces 20 are simultaneously moved to the inside in a radial direction along a guide groove 16 of a slide guide table 4. Accordingly, the snap ring W is uniformly contracted by the nine contraction pieces 20 so that the roundness of the snap ring W is improved after contraction. At this time, the collision of both the ends of the abutment part of the snap ring W is prevented by a collision prevention block 23 so that they are smoothly superposed with each other. Accordingly, the snap ring W is smoothly and largely contracted. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a snap ring contracting device for contracting a C-shaped snap ring.

Conventionally, as a snap ring assembling device for shrinking a C-shaped snap ring and inserting it into an assembling hole and assembling it into an inner peripheral groove formed on the inner peripheral surface of the assembling hole, for example, described in Patent Document 1 Is known.
JP 2005-153037 A

  The snap ring assembling apparatus described in Patent Document 1 is configured such that the snap ring is gripped from the outer peripheral side by four claw portions provided on a pair of arms arranged substantially in parallel and contracted, and the contracted snap ring is cylindrical. The assembly jig is held at the inner periphery of the assembly jig, the assembly jig is inserted into the assembly hole, and then the snap ring is pushed out of the assembly jig to be assembled into the inner circumferential groove.

  However, the snap ring assembling apparatus described in Patent Document 1 has the following problems. Since the snap ring is contracted by the four claw portions provided on the pair of arms, it is difficult to uniformly contract, and stress concentrates on the pressing portion by the claw portion, so that the snap ring is easily deformed. In particular, the shrinkage at both ends of the joint (C-shaped notch) tends to be insufficient, and it is difficult to maintain a circular shape. Further, when the contraction amount increases, the joints may collide with each other, and smooth contraction becomes difficult.

  This invention is made | formed in view of said point, and it aims at providing the snap ring contraction apparatus which can shrink | contract a snap ring smoothly and uniformly.

  In order to solve the above-described problems, a snap ring contraction device according to the present invention is disposed at a predetermined interval along the circumferential direction on the outer peripheral portion of a C-shaped snap ring as a workpiece and moves along a radial direction. A plurality of contracting pieces that are guided so as to be engaged with an outer peripheral portion of the snap ring, and a drive unit that simultaneously moves the plurality of contracting pieces in the radial direction are provided.

(Aspect of the Invention)
In the following, some aspects of the invention that can be claimed in the present invention (hereinafter sometimes referred to as “claimable invention”) will be exemplified and described. As with the claims, each aspect is divided into sections, each section is numbered, and is described in a form that cites the numbers of other sections as necessary. This is for the purpose of facilitating the understanding of the claimable invention, and is not intended to limit the combinations of the constituent elements constituting the claimable invention to those described in the following sections. In other words, the claimable invention should be construed in consideration of the description accompanying each section, the description of the embodiments, etc., and as long as the interpretation is followed, another aspect is added to the form of each section. In addition, an aspect in which constituent elements are deleted from the aspect of each item can be an aspect of the claimable invention. The following contents (1) to (6) correspond to claims 1 to 6.

(1) A plurality of C-shaped snap rings, which are workpieces, are arranged at predetermined intervals along the circumferential direction, are movably guided along the radial direction, and engage with the outer peripheral portion of the snap ring. A snap ring contracting device, comprising: a contracting piece of a plurality of members; and a driving means for simultaneously moving the plurality of contracting pieces in the radial direction.
With this configuration, the snap ring is simultaneously pressed by a plurality of contracting pieces arranged at a predetermined interval and is contracted uniformly. A known mechanical element such as a cam mechanism can be used as the driving means for the contraction piece.
(2) In the configuration of (1), the driving means includes a cam follower provided in the contracting piece, a rotary table having a cam groove engaged with the cam follower, and an actuator for rotating the rotary table, The cam groove is inclined at a predetermined angle from the outer peripheral side to the inner peripheral side of the rotary table, and the cam follower moves along the cam groove by the rotation of the rotary table, so that the contracting piece is radially moved. A snap ring retractor characterized by moving along.
With this configuration, it is possible to simultaneously move the plurality of contracting pieces in the radial direction by interlocking the cam groove of the rotary table and the cam follower. By using a roller follower as the cam follower, sliding resistance can be reduced and the cam follower can be operated smoothly.
(3) In the configuration of (1) or (2), the interval between the plurality of contracting pieces is small in the vicinity of the joint of the snap ring.
By comprising in this way, it can suppress that the edge part of the abutment of a snap ring escapes to an outer peripheral side during shrinkage | contraction, and can raise the roundness of the snap ring after shrinkage | contraction.
(4) In any one of the constitutions (1) to (3), an auxiliary contracting piece fixed in the radial direction that comes into contact with the inner peripheral portion of the snap ring is provided near the joint of the snap ring. Snap ring contraction device characterized by.
With this configuration, both ends of the abutment of the snap ring are pressed from both sides with the outer contraction piece and the inner contraction piece to stabilize the joint, and after the snap ring is contracted The roundness of can be increased. The auxiliary contraction piece may move in the circumferential direction as long as it is fixed in the radial direction, and may be fixed, for example, on a rotary table. Further, the auxiliary contraction piece may be fixed in both the radial direction and the circumferential direction.
(5) In any one of the constitutions (1) to (4), an abutting portion fixed to a portion facing the abutment of the snap ring and abutting with one end of the abutment of the snap ring being contracted, A snap ring contraction device comprising a collision prevention block formed with an inclined portion that is guided so that the other end portion rides on and overlaps the one end portion.
With this configuration, the collision prevention block can prevent the snap ring joints from colliding with each other during the contraction, so that the snap ring can be contracted smoothly and greatly.
(6) In the configuration of (5), the contraction piece is provided with a guide groove that engages with an outer peripheral portion of the snap ring, and the contraction piece disposed on the inclined surface side of the collision prevention block. The height of the guide groove is higher than the contraction piece disposed on the abutting portion side.
With this configuration, the snap ring can escape upward in the guide groove when the end portion of the abutment rides on the inclined portion of the collision prevention block, so that the snap ring can be smoothly contracted. .

  According to the snap ring contraction device of the present invention, the snap ring can be contracted uniformly by the plurality of contraction pieces arranged at a predetermined interval.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
The snap ring contraction device according to the present embodiment is for setting a C-shaped snap ring as a work, contracting it to a predetermined diameter, and delivering it to the snap ring assembly device. 1, 4, and 5 show an overall view of the snap ring contraction apparatus 1 according to the present embodiment.

  As shown in FIGS. 1, 4, and 5, the snap ring contraction device 1 includes a substantially disc-shaped link plate 3, a slide guide plate 4, and a rotary table 5 that are concentric on a substantially rectangular flat base 2. It is provided above. In FIG. 1, the link plate 3 and the rotary table 5 are omitted, and FIG. 3 shows the slide guide plate 4 and the rotary table 5 omitted. The slide guide plate 4 arranged between the link plate 3 and the rotary table 5 is fixed to the base 2 by a plurality of (four in this embodiment) fixing rods 6 arranged at equal intervals in the circumferential direction. Yes. The link plate 3 and the turntable 5 are connected to each other by a connecting shaft 7 that passes through the central opening of the slide guide plate 4. The connecting shaft 7 is rotatably supported by the slide guide plate 4 by two bearings 8. The link plate 3 can be rotated within a certain range by inserting the fixed rod 6 through four elongated holes 9 extending along the circumferential direction.

  An air cylinder 10 (actuator) is provided on the side of the link plate 3 on the base 2. A cylinder portion 11 of the air cylinder 10 is rotatably attached to the base 2 by a pin 12. Further, the distal end portion of the operating rod 13 of the air cylinder 10 is rotatably connected to one end portion of the link plate 3 via a knuckle 14. The compressed air is supplied / discharged from the supply / discharge ports 11 </ b> A and 11 </ b> B of the cylinder portion 11, and the operating rod 13 is expanded / contracted, whereby the link plate 3 and the rotary table 5 are integrally rotated. On the base 2, a pair of adjustment screws 15 that abut on the link plate 3 and adjust its rotation range (angle) to a constant value are provided.

  A plurality of (9 in the illustrated example) guide grooves 16 extending radially along the radial direction are formed on the outer periphery of the slide guide plate 4 fixed to the base 2. A slide block 17 is fitted in each guide groove 16 and guided so as to be movable along the radial direction. A shaft 18 protrudes upward from the slide block 17, and a roller follower 19 (cam follower) is rotatably attached to the base side of the shaft 18, and engages with the outer peripheral portion of the snap ring W on the tip side. A cylindrical shrink piece 20 having a guide groove 20A (outer peripheral groove) is rotatably attached.

  The rotary table 5 is provided with a plurality of (9 in the illustrated example corresponding to the number of roller followers 19) cam grooves 21 that are engaged with the respective roller followers 19. The cam groove 21 is formed in the shape of a long hole extending at an angle from the outer peripheral side of the turntable 5 toward the inner peripheral side. The air cylinder 10, the roller follower 19, and the cam groove 21 of the rotary table 5 constitute drive means for moving the contracting piece 20. When the rotary table 5 rotates, the roller follower 19 moves along the cam groove 21. As a result, the nine slide blocks 17 simultaneously move in the radial direction along the guide grooves 16. A circular recess 22 having a diameter slightly larger than the outer diameter of the snap ring W is formed at the center of the turntable 5. The bottom of the recess 22 and the lower end of the guide groove 20 </ b> A of the contracting piece 20 are substantially the same height, so that the snap ring W is placed on the recess 22 and the contracting piece 20 is placed on the turntable 5. When moved radially inward, the outer periphery of the snap ring W is inserted into the guide groove 20A and engaged.

  A collision prevention block 23 is attached to one side (right side in FIG. 4) of the slide guide plate 4 fixed to the base 2. 4 and FIG. 6, the collision prevention block 23 is inserted into the opening 5 </ b> A provided in the turntable 5, and the joint C of the snap ring W placed in the recess 22 of the turntable 5. It protrudes to a position facing (see FIG. 4) at substantially the same height as the bottom of the recess 22 and extends in the radial direction so as to face the snap ring W during contraction. A step having a height substantially equal to the thickness of the snap ring W is provided at the upper end of the collision prevention block 23, and an abutting portion 23A that contacts one end of the joint C of the snap ring W is formed. In addition, an inclined portion 23B on which the other end portion of the joint C of the snap ring W rides is formed.

  The arrangement of the nine contracting pieces 20 will be described with reference to the suffixes a to i in the clockwise direction from the collision prevention block 23 in FIG. Of the nine shrinking pieces 20a to 20i, the seven shrinking pieces 20b to 20h are arranged at substantially equal intervals (about 45 ° intervals) from the collision prevention block 23. The two contraction pieces 20a and 20i adjacent to the collision prevention block 23 are disposed in the vicinity of the collision prevention block 23 so as to contact the outer peripheral portions of both ends of the joint C of the snap ring W. The interval is small in the vicinity of the joint C of the ring W. On the radially inner side of the contraction pieces 20b and 20h arranged at both ends of the seven contraction pieces 20b to 20h arranged at substantially equal intervals, when the snap ring W is contracted, there are two An auxiliary shrinking piece 24 is attached.

  The lower end portions of the guide grooves 20A of the nine contracting pieces 20a to 20i are arranged at substantially the same fixed position as the bottom portion of the concave portion 22 of the turntable 5, but the height H (see FIG. 5) prevents collision. The block 23 is gradually increased in the clockwise direction. The contraction pieces 20a to 20c are approximately equal to the thickness of the snap ring W, the contraction pieces 20d to 20f are higher than the thickness, and the contraction pieces 20g to 20i are Further, the height is about twice the thickness of the snap ring W. 4 and 5, reference numeral 25 denotes a workpiece check sensor that detects the presence or absence of the snap ring W on the rotary table 5.

Next, the operation of the present embodiment configured as described above will be described.
The air cylinder 10 is actuated to shorten the actuating rod 13, and the link plate 3 and the rotary table 5 are rotated clockwise to bring the snap ring W into an open position as shown in FIG. Move. At this time, the roller follower 19 moves outward along the cam groove 21 of the rotary table 5, and the slide block 17 and the contracting piece 20 move radially outward along the guide groove 16 of the slide guide plate 4. In this state, the snap ring W is placed in the recess 22 of the turntable 5 so that the joint C is disposed on the collision prevention block 23 side.

  Next, the air cylinder 10 is operated to extend the operating rod 13, and the link plate 3 and the rotary table 5 are rotated counterclockwise to contract the snap ring W as shown in FIG. Move to position. At this time, the roller follower 19 moves along the cam groove 21 of the rotary table 5, and the nine slide blocks 17 and the contracting pieces 20 move simultaneously radially inward along the guide groove 16 of the slide guide plate 4. As a result, the guide grooves 20A of the nine contracting pieces 20 press the snap ring W evenly from the outside to contract.

  When contraction of the snap ring W proceeds, as shown in FIG. 6, one end of the joint C is fixed in contact with the abutting portion 23A of the collision prevention block 23, and the other end rides on the inclined portion 23B. Since both ends overlap without colliding, it can be contracted smoothly and greatly. At this time, since the height H of the guide groove 20A of the contracting piece 20 is higher on the inclined portion 23B side of the collision prevention block 23, when the other end portion of the joint C rides on the inclined portion 23B, the snap ring W is moved upward. The both ends of the joint C can be smoothly stacked.

  The nine contracting pieces 20 press the entire circumference of the snap ring W substantially uniformly toward the center thereof, so that the concentration of stress can be relaxed and the snap ring W can be contracted uniformly. The circularity can be increased. Further, in the vicinity of the collision prevention block 23, the shrinking pieces 20a and 20i are arranged to reduce the interval between the shrinking pieces 20, and the auxiliary shrinking piece 24 is arranged on the inner peripheral side of the snap ring W so that both ends of the joint C are arranged. By sandwiching the portion from both sides by the shrinking pieces 20a and 20i and the auxiliary shrinking piece 24, it is possible to suppress the both ends of the joint C from escaping to the outer peripheral side, and to increase the roundness of the snap ring W during shrinkage. Can do. In this embodiment, the auxiliary contraction piece 24 is fixed to the rotary table 5 and rotates together with the rotary table 5 when the snap ring W is contracted. May be fixed at all times.

  Thus, the contracted snap ring W is received by a snap ring assembling apparatus 26 as shown in FIG. 7, for example, and assembled in the inner peripheral groove of the assembling hole. The snap ring assembling device 26 interferes with the concavity and convexity of the opening portion of the assembling hole and the plurality of contracting pieces 20 of the snap ring contracting device 1 at the tip of the cylindrical jig 27 that holds the contracted snap ring W. A plurality of cutouts 28 are provided at appropriate portions so as not to occur. Further, an extrusion member 29 for extruding the snap ring W held by the jig 27 is provided inside the jig 27 so as to be able to advance and retreat. By moving the push-out member 29 by the actuator 30, the assembly of the snap ring W is provided. Append.

It is a perspective view which shows the state before and behind shrinkage | contraction of the snap ring of the snap ring contraction apparatus which concerns on one Embodiment of this invention. In FIG. 1, it is a figure which abbreviate | omits and shows a link plate and a rotary table. In FIG. 1, it is a figure which abbreviate | omits and shows a slide guide plate and a rotary table. It is a top view of the snap ring contraction apparatus shown in FIG. It is a longitudinal cross-sectional view of the side surface of the snap ring contraction device shown in FIG. In the snap ring contraction device shown in FIG. 1, it is an enlarged perspective view showing a joint portion when the snap ring is contracted. FIG. 2 is a perspective view of a snap ring assembly device that receives a snap ring contracted by the snap ring contraction device shown in FIG. 1 and assembles the snap ring at a predetermined assembly position.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Snap ring contraction device, 5 Rotary table (drive means), 10 Air cylinder (actuator, drive means), 19 Cam follower (drive means), 20 Shrink top, 21 Cam groove (drive means), W Snap ring

Claims (6)

A plurality of contracting pieces that are arranged at predetermined intervals along the circumferential direction on the outer peripheral portion of a C-shaped snap ring that is a workpiece, are guided to be movable along the radial direction, and engage with the outer peripheral portion of the snap ring And a snap ring contracting device comprising: a driving means for simultaneously moving the plurality of contracting pieces in the radial direction. The driving means includes a cam follower provided on the contracting piece, a rotary table having a cam groove engaged with the cam follower, and an actuator for rotating the rotary table, and the cam groove is an outer periphery of the rotary table. The cam follower is inclined at a predetermined angle from the side toward the inner peripheral side, the cam follower is moved along the cam groove by the rotation of the rotary table, and the contracting piece is moved along a radial direction. Item 2. The snap ring contractor according to Item 1. 3. The spring contracting device according to claim 1, wherein an interval between the plurality of contracting pieces is small in the vicinity of the joint of the snap ring. 4. The snap ring according to claim 1, wherein an auxiliary contraction piece fixed in a radial direction that comes into contact with an inner peripheral portion of the snap ring is provided in the vicinity of the joint of the snap ring. Contraction device. An abutting portion fixed to a portion facing the joint of the snap ring and in contact with one end of the joint of the snap ring being contracted, and an inclination guided so that the other end of the joint rides up and overlaps the one end The snap ring contraction device according to claim 1, further comprising a collision prevention block formed with a portion. The contraction piece is provided with a guide groove that engages with an outer peripheral portion of the snap ring, and the contraction piece arranged on the inclined surface side of the collision prevention block is arranged on the abutting portion side. 6. The snap ring contraction device according to claim 5, wherein the height of the guide groove is larger than the contraction piece.

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