JP4624657B2 - Retaining ring assembly method - Google Patents

Description

The present invention relates to an assembling method for attaching a C-shaped retaining ring to an annular groove of a mounting hole formed in a mounting part such as a cylindrical out roller used for a constant velocity universal joint.

  The tripod type constant velocity universal joint is configured by connecting a tripod member 1 and a cylindrical outer joint member 6 as shown in FIG. 8 (see, for example, Patent Document 1). An inner roller 3 is rotatably fitted to a leg shaft 2 projecting radially on the outer periphery of the tip of the tripport member 1, and an outer roller 11 is rotatably fitted to the outer periphery of the inner roller 3 via a plurality of needle-like rolling elements 10. Combined. The outer roller 11 is fitted in the track groove 7 on the inner peripheral surface of the outer joint member 6 so as to be slidable, thereby forming a constant velocity universal joint.

  An inner peripheral surface 12 of the outer roller 11 is a rolling surface of the needle-like rolling element 10, and annular grooves 13 are formed in the circumferential direction at both axial ends of the rolling surface, and the annular grooves 13 at both axial ends are elastic. A metal plate C-shaped retaining ring 14 is fitted. A pair of retaining rings 14 at both ends in the axial direction prevent the rolling element 10 from coming off from the inner peripheral surface 12 of the outer roller 11 in the axial direction. Hereinafter, the outer roller 11 with respect to the retaining ring 14 is referred to as a mounted part, and the inner peripheral surface 12 thereof is referred to as a mounted hole as necessary.

  A retaining ring assembling device for attaching a retaining ring having a C-shaped cut portion separated from each other at both ends in an annular groove formed in a mounting hole of a mounted component such as the outer roller 11 is shown in FIG. 10, for example. Such a tapered cone type is generally used (see, for example, Patent Document 2). Examples of the basic structure and assembly operation are shown in FIGS. 10A to 10C, and examples of the shape of the retaining ring during the assembly operation are shown in FIGS. 10A to 10C.

  10A is a cross-sectional view of the retaining ring assembly device before inserting the retaining ring, and FIG. 10A is a plan view of the retaining ring 20 in a free state before insertion. The retaining ring 20 shown in FIG. 10 is substantially the same as the retaining ring 14 of FIG. 8, but is attached to a mounted part other than the outer roller of the constant velocity universal joint. Reference numeral 21 is attached to a mounted part such as an outer roller to which the retaining ring 20 is attached. The mounted part 21 is a cylindrical part, has a mounted hole 22 that is straight in the axial direction, and an annular groove 23 is formed on the inner periphery of both ends of the mounted hole 22 in the axial direction. The C-shaped retaining ring 20 of the plate is fitted through the process of diameter reduction and diameter expansion.

  A vertical columnar shaft 30 is inserted into the mounting hole 22 up to a fixed position, and a diameter reducing jig 31 is connected directly above the mounting component 21. The diameter-reducing jig 31 has a diameter-reduced tapered surface 32 having an inverted truncated cone shape. The inner diameter of the opening at the lower end of the reduced diameter tapered surface 32 is equal to or smaller than the diameter of the mounting hole 22, and the inner diameter of the opening at the upper end is equal to or larger than the maximum outer diameter D1 of the retaining ring 20 in the free state. An insertion jig 33 is concentrically disposed right above the reduced diameter tapered surface 32 so as to be movable up and down. The lower end of the insertion jig 33 is cylindrical, and the outer diameter of the lower end is equal to or smaller than the hole diameter of the mounting hole 22. The lower end surface of the insertion jig 33 is flat, and this lower end surface contacts the flat upper surface of the horizontal retaining ring 20.

  When the retaining ring 20 is set horizontally in the reduced diameter tapered surface 32, the outer periphery of the retaining ring 20 contacts and is held in the middle of the reduced diameter tapered surface 32 as shown in FIG. When the insertion jig 33 is lowered from directly above the retaining ring 20 and the flat annular lower end surface of the insertion jig 33 is brought into contact with the upper surface of the retaining ring 20 and further lowered, as shown in FIG. The outer periphery of the retaining ring 20 is in sliding contact with the reduced diameter tapered surface 32, and the entire circumference of the retaining ring 20 is simultaneously contracted to move between the mounting hole 22 and the shaft 30 from the small diameter opening of the reduced diameter tapered surface 32. To do. The outer diameter D2 of the retaining ring 20 at this time is shown in FIG. 10 (B '), and this outer diameter D2 is minimized when the ends of the cut portions 20a and 20b at both ends of the retaining ring 20 abut against each other.

When the insertion jig 33 is lowered from the state of FIG. 10 (B) and the retaining ring 20 is moved to the annular groove 23 of the mounting hole 22, the retaining ring 20 is elastically restored as shown in FIG. 10 (C). The insertion jig 33 stops descending at the inner diameter portion of the retaining ring 20 that expands and fits into the annular groove 23 and protrudes from the annular groove 23. The outer diameter of the retaining ring 20 at this time is D3 shown in FIG. 10 (C ′), which is the same as the maximum inner diameter of the annular groove 23.
JP 2002-327773 A (FIG. 6) JP 2002-292529 A

  The retaining ring assembling method as shown in FIG. 10 is simple in mechanism, and is easy to fully assemble and cope with high speed, but when the C-shaped retaining ring is fitted in the annular groove of the mounting hole. As the gap between the cut ends at both ends of the retaining ring is set to be small, there is a problem that proper handling becomes difficult. For example, the gap G3 between the ends of the cut ends 20a and 20b of the retaining ring 20 at the time of completion of assembly shown in FIG. 10 (C ′) is rolled so that the rolling element 10 does not come out in the constant velocity universal joint shown in FIG. Although it is set to be sufficiently small because it is necessary to make it smaller than the outer diameter of the moving body 10, the gap G2 at the time of FIG. If the ends of the cut ends 20a and 20b are brought into contact with each other and the gap G2 = 0, the retaining ring 20 cannot be further reduced in diameter, so the gap G2 is set to a predetermined appropriate value to reduce the diameter. Since the diameter is expanded and finally fitted into the annular groove 23, it is difficult to set the final gap G3 to be less than the outer diameter of the rolling element 10.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a method for assembling a C-shaped retaining ring into a hole of a mounted part with a simple mechanism and high productivity.

In the present invention, a C-shaped retaining ring having an outer diameter larger than the hole diameter of the mounting hole and having a cut portion separated at both ends is fitted into an annular groove formed in the inner periphery of the mounting hole of the mounted part. A method of assembling the retaining ring, the step of pressing the retaining ring radially inward from the outer periphery thereof to overlap the both-end cut portions with each other and reducing the diameter to be equal to or less than the hole diameter; A process of expanding the retaining ring with an elastic return force in a state where one of the wrapped cut ends is fitted to a part of the annular groove, and sequentially fitting the annular groove from one cut part to the other cut part. possess the door, radially outward to the outer periphery of the retaining ring is moved forward and a plurality of movable condensation径治instrument which movably disposed back and forth in the same radial direction radially inwardly of the retaining ring in order of the snap ring the order by pressing in turn reduced in diameter toward the other cut section retaining ring from one cut section And wherein the door.

  Here, the mounted part is a cylindrical roller in a tripod type constant velocity universal joint, and has a circular mounted hole that is straight in the axial direction, and annular grooves formed in the circumferential direction at both axial ends of the hole. A C-shaped retaining ring made of an elastic metal is reduced in diameter to be equal to or smaller than the hole diameter of the mounting hole, inserted into the hole, expanded in the hole, and fitted into the annular groove. The diameter of the retaining ring can be automatically reduced by using various jigs that press the outer periphery of the retaining ring toward the center of the retaining ring. By overlapping so that they are superposed on each other, the diameter can be sufficiently reduced. Insert the snap ring with the reduced diameter into the position of the annular groove of the mounting hole, and insert the snap ring at the leading end of the overlapping cut ends into the part of the annular groove. Can be fitted automatically or semi-automatically into the annular groove using a simple jig by expanding the diameter of the ring to the other cut portion and inserting it into the annular groove. The cut ends of the retaining ring that are expanded and fitted in the annular groove are opposed to each other with their tips spaced apart from each other, and the gap between the tips can be reduced in proportion to the amount of overlap of the cut ends at the time of diameter reduction. .

  As the plurality of movable diameter reducing jigs here, plate-shaped ones arranged radially from the center point of the retaining ring can be applied near the outer periphery of the retaining ring, and the plurality of diameter reducing jigs can be applied one by one, or The plurality of rings are sequentially moved forward toward the center of the retaining ring and pressed against the outer periphery of the retaining ring, and the retaining rings are sequentially reduced in diameter in the circumferential direction. Also, when reducing the diameter of the retaining ring with a diameter-reducing jig, apply a cylindrical or columnar shaft to the inner periphery of the retaining ring so that the center point of the retaining ring does not move and reduce the diameter of the retaining ring. It is desirable to do so. By reducing the diameter of the C-shaped retaining ring in turn with a plurality of movable diameter-reducing jigs, each of the plurality of diameter-reducing jigs can reduce the diameter of the retaining ring with a small pressing force, thus simplifying the mechanism. It becomes.

  In the present invention, when reducing the diameter of the C-shaped retaining ring in the circumferential direction with a plurality of diameter-reducing jigs in order, one cut portion of the retaining ring is inserted into a part of the annular groove of the mounting hole. The retaining ring can be reduced in diameter with a movable diameter reduction jig. The operation of inserting one cut portion of the C-shaped retaining ring into the annular groove of the mounting hole is performed automatically or manually, and the outer periphery of the retaining ring is directed from one cut portion inserted into the annular groove toward the other cut portion. The retaining rings are sequentially reduced in diameter in the circumferential direction by sequentially pressing the plurality of locations with corresponding diameter reduction jigs. This diameter-reducing operation can be carried out accurately and smoothly at all times because one cut end portion of the retaining ring is positioned and supported by the annular groove, and high-speed work is facilitated.

  Further, in the present invention, after inserting one cut portion of the C-shaped retaining ring into the annular groove of the mounting hole and reducing the retaining ring in order with a plurality of movable diameter-reducing jigs, the retaining ring is pivoted. The retaining ring can be sequentially fitted into the annular groove by sequentially pressing the retaining ring from one cut portion toward the other cut portion with a pressing jig that pushes in the direction. As the pressing jig here, a cylindrical jig, a columnar jig, or a roller jig that rolls on the reduced diameter retaining ring can be applied, which is concentric with the retaining ring and rotates around the center line.

  In the case of the former cylindrical jig or cylindrical jig, a projection is provided on a part of the tip surface for pressing the reduced diameter retaining ring, and only this projection is pressed against the retaining ring, and the jig itself Rotate to slide the projection on the retaining ring. Such a jig can be applied with a simple structure. Further, since the roller only rolls on the retaining ring, the latter roller jig performs a smooth retaining ring assembly operation without damaging the retaining ring.

  In the mounted part to which the retaining ring is assembled as described above, the inner peripheral surface of the mounted hole is a rolling surface of a plurality of rolling elements, and annular grooves are provided at both axial ends of the rolling surface. A constant velocity universal joint roller can be applied. As this constant velocity universal joint roller, an outer roller of a tripod type constant velocity universal joint is suitable.

  Further, in a mounted part such as an outer roller of a tripod type constant velocity universal joint, the present invention provides an annular groove formed at both axial ends of a mounted hole whose inner peripheral surface is a rolling surface of a plurality of rolling elements. In the case of a retaining ring assembly with a C-shaped retaining ring fitted with a C-shaped retaining ring having an outer diameter larger than the hole diameter of the mounted hole and spaced apart at both ends, the ends of the both ends of the retaining ring are butted together. When the outer diameter of the retaining ring is larger than the hole diameter of the mounting hole and smaller than the maximum inner diameter of the annular groove, the retaining ring is expanded when fitted to the annular groove. The structure is characterized in that the ends of both end cut portions face each other with a gap smaller than the outer diameter of a single rolling element.

  When the mounted part here is an outer roller of a tripod type constant velocity universal joint, the needle-like rolling elements that roll on the inner peripheral surface of the mounted hole do not come out between the cut ends of the retaining ring, and the outer roller The outer roller can be assembled to a corresponding inner roller or the like in a state where a constant number of rolling elements are assembled on the inner periphery, and the assembly of the constant velocity universal joint can be improved.

  According to the retaining ring assembling method of the present invention, the C-shaped retaining ring can be fitted into the annular groove of the mounting hole from the state in which the cut ends are overlapped by using a simple jig. Improves sex. In addition, by adjusting the overlap amount of the cut ends on both ends of the retaining ring, the gap between the cut ends on both ends when the retaining ring is fitted into the annular groove can be set sufficiently small. Even if the rolling element whose inner peripheral surface is a rolling surface has a small diameter, there is an advantage that it can sufficiently cope with this.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 to 3 are for explaining the first retaining ring assembling method, and the same or corresponding parts as those in FIG. 10 are denoted by the same reference numerals. That is, the retaining ring 20 in the figure is a C-shaped metal plate, and has a spiral C shape in FIG. 1, and both end cut portions 20a and 20b have steps in the axial direction. The mounted part 21 to which the retaining ring 20 is mounted, the annular groove 23 of the mounted hole 22, and the shaft 30 that prevents misalignment and misalignment of the reduced retaining ring 20 are illustrated in FIG. It is the same as that shown in. In the method of the present invention, the retaining ring 0 is reduced in diameter by the following plurality of movable diameter reducing jigs 40, and the retaining ring 20 reduced in diameter by the pressing jig 50 moving up and down and rotating is fitted into the annular groove 23. Let

  As shown in FIG. 1, a mounted part 21 is fitted and inserted into a vertical shaft 30 and is positioned and held at a fixed position. A plurality of movable diameter-reducing jigs 40 are arranged along a flat upper surface of the mounted part 21. The cylindrical pressing jig 50 is arranged concentrically just above the shaft 30.

  For example, as shown in FIG. 3, the plurality of movable diameter reducing jigs 40 are strips extending radially from the center of the mounted component 21, and four pieces are arranged on the upper surface of the mounted component 21 with a 90 ° gap. The Each of the diameter reducing jigs 40 is connected to the same or independent horizontal drive system, and each of the diameter reducing jigs 40 independently advances inward in the radial direction of the mounted component 21 and retracts outward in the radial direction. The four diameter reducing jigs 40 are sequentially advanced with a time gap to sequentially reduce the diameter of the retaining ring 20 in the circumferential direction. In order to make the explanation of the diameter reduction operation easy to understand, hereinafter, four pieces are referred to as diameter reduction jigs 40a to 40d as necessary.

  The lower end portion 50a of the pressing jig 50 is a cylindrical portion having an inner and outer diameter that can be inserted between the mounting hole 22 and the shaft 30, and the lower surface of the lower end portion 50a is flat, and has a protrusion 51 in part. The protrusion 51 is composed of a roller 52 as shown in FIGS. 1 and 2, for example. A part of the lower surface of the cylindrical lower end 50a is cut out right above, and the roller 52 is rotatably installed in the notch, and the lower part of the roller 52 is slightly protruded from the lower surface of the lower end 50a. The roller 52 abuts against a part of the upper surface of the retaining ring 20 having a reduced diameter and presses in the axial direction, and the roller 52 rolls on the retaining ring 20 by the rotation of the pressing jig 50 and presses the retaining ring 20. The position moves in order.

  Next, the retaining ring diameter reducing operation using the four diameter reducing jigs 40 a to 40 d and the retaining ring pressing operation by the pressing jig 50 will be described.

  As shown in FIG. 1, a spiral retaining ring 20 in a free state is inserted between the mounting hole 22 of the mounted component 21 positioned and held by the shaft 30 and the shaft 30, and the lower end of the retaining ring 20 is The leading end of the one cut end portion 20 a is inserted into a part of the annular groove 23. At this time, as shown in FIG. 3 (A), the retaining ring 20 is inserted into the annular groove 23 in the direction in which one specific diameter reducing jig 40d is present. Determine the phase. Such a retaining ring 20 can be set while manually checking the quality. The retaining ring 20 in the free state extends spirally from the annular groove 23 to above the mounting hole 22, and the tips of the four diameter-reducing jigs 40a to 40d are predetermined at four positions in the 90 ° gap on the outer periphery. Face in the gap.

  When the setting of the retaining ring 20 is completed, first, as shown in FIG. 3 (B), only one diameter-reducing jig 40a whose order is determined in advance is advanced to be close to one cut portion 20a of the retaining ring 20. A part of the outer periphery is pressed toward the shaft 30 to hold the pressed state. Next, as shown in FIG. 3C, the second diameter reducing jig 40 b is advanced to press the retaining ring 20 toward the shaft 30. By this pressing, a part near half of the retaining ring 20 is reduced in diameter, and the other cut portion 20b approaches one cut portion 20a. Next, as shown in FIG. 3D, the third diameter reducing jig 40c is advanced to press the retaining ring 20 toward the shaft 30, and the diameter of the portion near the remaining half of the retaining ring 20 is reduced. The cut portion 20b is brought close to one cut portion 20a and slightly overlapped. Finally, when the remaining one diameter reducing jig 40d is advanced, as shown in FIG. 3E, the diameter reducing jig 40d faces the shaft 30 so that the both ends cut portions 20a and 20b of the retaining ring 20 overlap each other. Then, the final diameter reduction of the retaining ring 20 is performed, and both end cut portions 20a and 20b overlap with a predetermined length.

  As described above, by reducing the diameter of the retaining ring 20 in order by the four diameter reducing jigs 40a to 40d, the pressing force by each diameter reducing jig can be reduced, and a small power and a simple drive system can be used. Further, since the diameter of the retaining ring 20 is reduced in order from one cut portion 20a to the other cut portion 20b, stable and reliable diameter reduction is possible. This diameter reduction can be performed more stably and surely by inserting and temporarily locking one cut end 20a in the annular groove 23.

  The retaining ring 20 whose diameter has been reduced is pressed by the four diameter-reducing jigs 40 a to 40 d, and the upper part from one of the cut ends 20 a is in a state of being spirally lifted from the mounting hole 22. Here, the pressing jig 50 is lowered, and the lower part of the roller 52 protruding from the lower end surface is pressed against the upper surface of one cut portion 20a of the retaining ring 20 in a reduced diameter state. When the roller 52 is applied to the upper surface of the cut portion 20a protruding from the annular groove 23 and the pressing jig 50 is rotated leftward as indicated by the arrow in FIG. 3 (F), the roller 52 is moved to the one cut portion 20a. The rolls 20a are pressed in order so as to approach the annular groove 23 while rolling on the upper surface, and the cut portions 20a are sequentially inserted into the annular groove 23 with elastic return force. When the pressing jig 50 is rotated almost once so that the roller 52 sequentially rolls from one cut portion 20a toward the other cut portion 20b, the entire retaining ring 20 is fitted into the annular groove 23, and both end cut portions are cut. The overlap of the portions 20a and 20b is released, and the tips face each other with a predetermined gap. Since the roller 52 sequentially presses the upper surface of the retaining ring 20 while rolling, the retaining ring 20 is not damaged, and the roller 52 is less worn and has a long life.

  FIGS. 4 to 6 are for explaining the second retaining ring assembly method. The retaining ring 20 is simultaneously removed from the entire circumference by using the fixed diameter reducing jig 60 and the insertion jig 70 shown in FIG. The diameter is reduced and inserted into the annular groove 23 of the mounting hole 22 in order.

  The fixed diameter reducing jig 60 is a tapered cone type similar to the prior art, and has an inverted truncated cone-shaped reduced diameter tapered surface 61. The inner diameter of the opening at the lower end of the reduced diameter tapered surface 61 is equal to or smaller than the diameter of the mounting hole 22, and the inner diameter of the opening at the upper end is equal to or larger than the maximum outer diameter of the retaining ring 20 in the free state. A cylindrical insertion jig 70 is concentrically disposed right above the reduced diameter taper surface 61 and is movable up and down around the center line. The lower end 70 a of the insertion jig 70 is cylindrical, and the outer diameter of the lower end 70 a is equal to or smaller than the hole diameter of the mounting hole 22, and the inner diameter is slightly larger than the outer diameter of the shaft 30. The lower end surface 70b of the insertion jig 70 is a spiral surface, and has a stepped portion 71 extending in the radial direction in part as shown in FIG. The step of the step portion 71 is set to be equal to or greater than the plate thickness of the retaining ring 20. The stepped portion 71 is a boundary portion between the concave step side lower surface m and the convex step side lower surface n, and the convex step side lower surface n is at the lowest position, and the lower end surface 70b extends spirally from the lower surface n. It reaches the side lower surface m.

  Note that the C-shaped retaining ring 20 shown in FIG. 4 is the same flat as in FIG. 10, but may be a spiral shape having a slight step between the cut ends 20 a and 20 b. .

  As shown in FIG. 6A, the retaining ring 20 is set horizontally in the reduced diameter tapered surface 61, and the outer periphery of the retaining ring 20 in a free state is brought into contact with a midpoint of the reduced diameter tapered surface 61. At this time, the phases of the cut ends 20 a and 20 b of the retaining ring 20 and the stepped portion 71 of the insertion jig 70 are matched. For example, the retaining ring 20 is phase-adjusted and set on the reduced diameter tapered surface 61 so that the stepped portion 71 is positioned directly above the tip of one of the cut ends 20b of the retaining ring 20. Such phase alignment may be performed by rotating the insertion jig 70 with respect to the retaining ring 20 set on the reduced diameter tapered surface 61.

  In the state of FIG. 6A, the insertion jig 70 is lowered directly below, the lower end surface 70b is pressed against the upper surface of the retaining ring 20, and the retaining ring 20 is formed on both sides of the stepped portion 71 as shown in FIG. Both cut ends 20a and 20b are pushed down to be deformed in the axial direction, and the tip of one cut end 20b is engaged with the stepped portion 71. When the insertion jig 70 is further lowered in this state, the entire outer diameter of the retaining ring 20 is simultaneously reduced in diameter while being in sliding contact with the reduced diameter tapered surface 61 downward in the axial direction. At this time, one cut portion 20b of the retaining ring 20 is locked to the stepped portion 71 and the movement in the circumferential direction is restricted, and there is a step larger than the thickness of the retaining ring plate between the ends of both cut portions 20a, 20b. Therefore, as the retaining ring 20 is reduced in diameter, one cut portion 20a moves to the other cut portion 20b, and both cut portions 20a and 20b overlap as shown by the broken line in FIG. With this overlap, the retaining ring 20 is helically deformed in a state where one cut portion 20a is positioned lower than the other cut portion 20b.

  Further, the insertion jig 70 is lowered to insert the helical retaining ring 20 having a reduced diameter into the mounting hole 22, and the cut end 20 a that is the lowermost end of the retaining ring 20 moves to the position of the annular groove 23. When the diameter is expanded by the elastic restoring force and the tip of the cut portion 20a is inserted into a part of the annular groove 23, the lowering of the insertion jig 70 is stopped, as indicated by the left rotation arrow in FIG. The insertion jig 70 is rotated. The rotation of the insertion jig 70 is performed in a direction in which the stepped portion 71 moves from one cut portion 20a of the retaining ring 20 to the other cut portion 20b. At the beginning of the rotation of the insertion jig 70, the lower surface n of the stepped portion 71 of the stepped portion 71 shown in FIG. 4 is pressed downward while slidably contacting the upper surface near one of the cut portions 20a already fitted in the annular groove 23. The ring is inserted into the annular groove 23, and the insertion is performed in order from one cut portion 20a of the retaining ring 20 to the other cut portion 20b, and the retaining ring 20 moves in the circumferential direction while the insertion jig 70 rotates once. The diameters of the retaining rings 20a and 20b are unwrapped, and the retaining ring is fitted into the annular groove 23.

  A third retaining ring assembly method using the fixed diameter reducing jig 60 and the insertion jig 70 of FIG. 4 will be described with reference to FIGS. This third method is different from the second method of FIG. 6 in that the retaining jig 20 is reduced in diameter by rotating the insertion jig 70 while rotating.

  As shown in FIG. 7A, the retaining ring 20 is set on the diameter-reduced tapered surface 61 of the diameter-reducing jig 60, and the insertion jig 70 is inserted from right above the retaining ring 20 to the right rotation arrow in FIG. As shown by, it is lowered while rotating in a fixed direction. When the lower end surface 70b of the insertion jig 70 comes into contact with the upper surface of the retaining ring 20, first, the convex step side lower surface n of the stepped portion 71 comes into contact with an arbitrary portion of the retaining ring 20, and the lower surface n remains as it is. When the lower surface n moves between the both end cut portions 20a and 20b of the retaining ring 20, the both end cut portions 20a and 20b are pressed in the axial direction on both sides of the stepped portion 71. As a result, the tip end of one of the cut portions 20 b is locked to the stepped portion 71. Thus, by lowering the insertion jig 70 while rotating, the cut portion 20b can be reliably locked to the stepped portion 71 without adjusting the phase relationship with the retaining ring 20 in advance.

  The process after the state shown in FIG. 7B is the same as that shown in FIG. That is, the insertion jig 70 is further lowered to reduce the diameter of the retaining ring 20 as shown in FIG. 7C, and the tip of the cut end 20 a at the lowermost end of the retaining ring 20 is made a part of the annular groove 23. The insertion jig 70 is inserted and stopped to descend and to rotate rightward. Next, as shown in FIG. 7D, the insertion jig 70 is rotated leftward (opposite to the rotating direction when lowered), and the retaining ring 20 is inserted into the annular groove 23 in order.

  FIG. 9 shows a retaining ring assembly structure in which the retaining ring 14 is assembled to the outer roller 11 of the tripod type constant velocity universal joint of FIG. 8 by the method of the present invention. An annular groove 13 is formed at both ends in the axial direction of the mounting hole 12 where the inner peripheral surface of the outer roller 11 which is a mounted part is a rolling surface of the plurality of needle-like rolling elements 10, and a retaining ring 14 is formed in both the annular grooves 13. To prevent the rolling element 10 from coming off.

  The outer roller 11 and the retaining ring 14 have the following dimensional relationship. The outer diameter of the annular retaining ring when the leading ends of both end cut portions 14 a and 14 b of the retaining ring 14 are abutted is larger than the hole diameter of the mounting hole 12 and smaller than the maximum inner diameter of the annular groove 13. Further, when the retaining ring 14 is expanded in diameter and fitted into the annular groove 13, the ends of the cut ends 14 a and 14 b of the retaining ring 14 face each other with a gap g smaller than the outer diameter d of the rolling element 10.

  By setting the dimensional relationship as described above, the rolling element 10 does not come out of the gap g of the retaining ring 14, and the retaining ring 14 is assembled into the annular groove 13 of the hole with a simple structure by the method of the present invention with good workability. It is done. Further, the needle roller having a small diameter d is used for the rolling element 10 and it does not fall even if it is assembled to the inner periphery of the outer roller 11, and the outer roller 11, the rolling element 10, and the retaining ring 14 are integrated into a unit as shown in FIG. 8 can be assembled to the inner roller 3 shown in FIG. 8 to improve the productivity of the tripod type constant velocity universal joint.

  The retaining ring assembling method of the present invention is also applicable to mounted parts such as constant velocity universal joints other than the tripod type, annular rollers used in other various bearings, and bearing outer rings.

It is sectional drawing of the principal part of the retaining ring assembly apparatus for demonstrating the 1st retaining ring assembly method of this invention. It is a bottom view of the pressing jig in the apparatus of FIG. (A)-(E) is a top view in each operation state including the TT line section of Drawing 1, and (F) is a top view showing a retaining ring insertion operation to an annular groove of a to-be-attached hole. . It is sectional drawing of the principal part of the retaining ring assembly apparatus for demonstrating the 2nd retaining ring assembly method of this invention. 4 is a bottom view of the insertion jig in the apparatus. (A)-(D) is sectional drawing in each operation state of the device of FIG. (A)-(D) is sectional drawing in each operation state for demonstrating the 3rd retaining ring assembly method using the apparatus of FIG. It is a fragmentary sectional view of a tripod type constant velocity universal joint. FIG. 9 is a plan view of an outer roller portion in FIG. 8, showing an embodiment of a retaining ring assembly structure assembled by the method of the present invention. (A)-(C) is sectional drawing in each operation state of the taper cone type retaining ring assembly apparatus for demonstrating the conventional retaining ring assembly method, (A ')-(C') is FIG. It is a top view which shows the state of the retaining ring in (A)-(C).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Triport member 2 Leg shaft 3 Inner roller 6 Outer joint member 7 Track groove 10 Rolling body 11 Outer roller 12 Mounted hole 13 Annular groove 14 Retaining ring 14a, 14b Cut part 20 Retaining ring 20a, 20b Cut part 21 Mounted part 22 Mounted Hole 23 Annular groove 30 Shaft 40 Movable diameter reduction jig 40a-40d Diameter reduction jig 50 Pressing jig 51 Projection part 52 Roller 60 Fixed diameter reduction jig 61 Reduction diameter taper surface 70 Insertion jig 71 Step part g Gap

Claims (5)

A retaining ring assembly for fitting a C-shaped retaining ring having an outer diameter larger than the diameter of the mounting hole and having a cut portion separated at both ends into an annular groove formed on the inner periphery of the mounting hole of the mounted part A method of attaching,
The step of pressing the retaining ring radially inward from the outer periphery to overlap the cut ends on both ends to reduce the diameter to the diameter of the hole or less; A step of expanding the retaining ring with an elastic return force in a state of being fitted to a part of the groove, and fitting the annular groove in order from one cut portion to the other cut portion. A plurality of movable diameter-reducing jigs arranged so as to be movable back and forth in the same radial direction outward in the radial direction are sequentially advanced inward in the radial direction of the retaining ring, and the retaining ring is pressed in order. The retaining ring assembling method is characterized in that the diameter is reduced in order from one cut portion toward the other cut portion.   The retaining ring assembly according to claim 1, wherein the retaining ring is reduced in diameter by the movable diameter reducing jig in a state where one cut portion of the retaining ring is fitted into a part of the annular groove. Method.   After the retaining ring having one cut end inserted into the annular groove is reduced in diameter by the movable diameter reducing jig, the stop ring is moved from the one cut end to the other by a pressing jig that presses the stop ring in the axial direction. The retaining ring assembling method according to claim 2, wherein the retaining ring is sequentially pressed toward the cut portion, and the retaining ring is sequentially fitted into the annular groove.   The retaining ring assembly method according to claim 3, wherein the pressing jig is a roller that rolls the retaining ring while pressing the retaining ring in the axial direction.   The mounted component is a roller for a constant velocity universal joint having an inner peripheral surface of the mounted hole which is a rolling surface of a plurality of rolling elements, and annular grooves at both axial ends of the rolling surface. The retaining ring assembly method according to any one of claims 1 to 4.