JP2009257531A - Coming-out preventing device of rotary member for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coming-out preventing device of a rotary member for vehicle capable of achieving excellent work efficiency and satisfactory fitting performance of a snap ring simultaneously when assembling. <P>SOLUTION: In this coming-out preventing device of the rotary member for vehicle, since a buffering material 50 formed by silicone used as a main material is provided on an inner peripheral side of the snap ring 34 in a groove part 32 formed in an outer peripheral part of a drive shaft 24 to allow the snap ring 34 to be fitted into it, bending of the snap ring 34 onto its inner peripheral side is prevented by the buffering material 50 provided on the inner peripheral side of the snap ring 34 for high frequency load such as vibration while the vehicle runs, and the snap ring 34 can be easily bent onto its inner peripheral side when assembling or disassembling, that is, providing the so-called coming-out preventing device 40 for the rotary member for the vehicle capable of achieving excellent work efficiency and satisfactory fitting performance of the snap ring 34 when assembling. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle rotation member retaining device, and more particularly, to an improvement for achieving both workability and assembling performance of a snap ring during assembly.

  Provided between the outer peripheral portion of the first rotating member and the inner peripheral portion of the second rotating member for suppressing relative position changes in the axial direction of the first rotating member and the second rotating member. A snap ring is used in the vehicle. For example, it is a snap ring that is provided at the end of the drive shaft and suppresses a change in position (missing) with respect to the differential side gear. With regard to such a configuration, when the snap ring bends toward the inner peripheral side, it becomes a problem that the first rotating member comes off from the second rotating member. In view of this, there has been proposed a vehicle rotation member retaining device that prevents the first rotation member from coming off from the second rotation member. For example, this is the structure for preventing the shaft from coming off from the constant velocity joint described in Patent Document 1. According to this technique, an inclined surface that contacts the inlet side of the insertion hole is formed on the surface of the snap ring in the shaft insertion direction, and a right angle formed on the surface of the snap ring in the shaft pull-out direction on the outlet side of the insertion hole. By forming a flat surface that makes contact with the abutment part, the shaft can be easily incorporated into the internal parts, and a structure that prevents the internal parts and the shaft from coming off can be realized. Has been.

JP 2006-266460 A

  However, with the conventional technology as described above, it is impossible to achieve both workability during assembly and the fitting performance of the snap ring. That is, in consideration of increasing the snap ring fitting force (spring force toward the outer peripheral side) in order to prevent the first rotating member from coming off from the second rotating member, at the time of assembly or disassembly, etc. The load necessary for deflecting the snap ring to the inner peripheral side is increased, which causes a problem that workability during assembly or disassembly is deteriorated. Moreover, if the fitting force of a snap ring is reduced in order to avoid the occurrence of such harmful effects, the fitting performance, which is the original purpose of the snap ring, is deteriorated. For this reason, the removal of the rotating member for the vehicle that can favorably suppress the first rotating member from coming off from the second rotating member without deteriorating the workability at the time of assembly or the like and the fitting performance of the snap ring. There was a need to develop a stop device.

  The present invention has been made against the background of the above circumstances, and an object of the present invention is to provide a vehicle rotating member retaining device that achieves both workability during assembly and the fitting performance of a snap ring. There is to do.

  In order to achieve such an object, the gist of the present invention includes a first rotating member, a second rotating member provided on the outer peripheral side of the first rotating member, and the first rotating member. A snap ring provided between the outer peripheral portion of the member and the inner peripheral portion of the second rotating member for suppressing a relative position change in the axial direction of the first rotating member and the second rotating member; The vehicle rotation member retaining device is configured to prevent the first rotation member from coming off from the second rotation member, wherein the first rotation member is formed on an outer peripheral portion of the first rotation member. A cushioning material mainly composed of silicone is interposed on the inner peripheral side of the snap ring in the groove for inserting the snap ring.

  In this case, a cushioning material mainly composed of silicone is interposed on the inner peripheral side of the snap ring in the groove portion for fitting the snap ring formed on the outer peripheral portion of the first rotating member. Therefore, for high-frequency loads such as vibration during vehicle travel, the buffer ring interposed on the inner peripheral side of the snap ring suppresses deflection to the inner peripheral side of the snap ring, When assembling or disassembling, it can be easily bent toward the inner periphery. That is, it is possible to provide a vehicle rotation member retaining device that achieves both workability during assembly and the like and the snap ring fitting performance.

  Here, preferably, the cushioning material is in a gel form. If it does in this way, the buffer material can be suitably held on the inner peripheral side of the snap ring in the groove part.

  Preferably, the first rotating member is a drive shaft, and the second rotating member is a differential side gear. If it does in this way, in a differential device for vehicles, it can control suitably that a drive shaft slips out from a differential side gear.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a view for explaining a differential device (differential device) 10 to which the present invention is suitably applied, and is a plane including an axis of a small gear shaft (pinion shaft) 18 and an axis of a drive shaft 24. It is sectional drawing cut | disconnected. As shown in FIG. 1, the differential device 10 is supported via a pair of tapered roller bearings so as to be rotatable (rotatable) around a shaft center orthogonal to an input shaft shaft (not shown). A differential case 12 made of, for example, cast iron, a large-diameter bevel gear 14 that is fixed to the outer peripheral portion of the differential case 12 with a fastener such as a bolt and meshes with a small-diameter bevel gear of a final reduction gear (not shown), and the differential case 12 Both ends of the small gear shaft 18 are supported on each other, and the small gear shaft 18 fixed to the differential case 12 by the knock pin 16 in a posture orthogonal to the rotational axis of the differential case 12 is opposed to the small gear shaft 18 with the small gear shaft 18 therebetween. A pair supported by the differential case 12 so as to be rotatable (rotatable) about its axis. Side gears 20l and 20r, and a pair of pinion gears 22 that are rotatably supported by the small gear shaft 18 by allowing the small gear shaft 18 to pass therethrough and mesh with the pair of side gears 20l and 20r, respectively. ing.

  The differential case 12 has a pair of left and right through-holes 26l formed for inserting a drive shaft 24 (only one corresponding to the right wheel is shown in FIG. 1) corresponding to the pair of left and right wheels. 26r is provided. Further, a fitting groove (spline groove) 28 is formed on the outer peripheral surface of the end portion of the drive shaft 24, and a fitting tooth (spline) is formed so as to mesh with the fitting groove 28 on the inner peripheral surface of the side gear 20. Teeth) 30 are formed, and the drive shaft 24 inserted into the through hole 26 is fitted into the inner peripheral side of the side gear 20 so that the fitting groove 28 and the fitting teeth 30 are engaged with each other. As a result, the relative rotation about the axis common to the side gear 20 is disabled, and the side gear 20 can be rotated integrally with the side gear 20. An annular groove 32 for fitting the snap ring 34 is formed on the outer peripheral portion at the end of the drive shaft 24, and is fitted into the groove 32 as will be described later with reference to FIG. The snap ring 34 is brought into contact with the end of the side gear 20 on the side of the small gear shaft 18 and is also brought into contact with the side wall of the groove 32 of the drive shaft 24, whereby the axial direction of the side gear 20 and the drive shaft 24 is related. The relative position change is suppressed, and the drive shaft 24 is configured not to come off the side gear 20.

  Further, in the differential 10, a pair of washers (washers) 36 each having an annular shape are formed between the end surfaces of the pair of side gears 20 l and 20 r and inner opening edges of the through holes 26 l and 26 r of the differential case 12 that supports the side gears. It is inserted in between. A convex disk washer 38 having a partial spherical shape and having a hole through which the small gear shaft 18 passes in the center is formed between the outer peripheral side end surfaces of the pair of pinion gears 22 and the inner wall surface of the differential case 12. It is inserted in between. The washers 36 and 38 are made of a wear-resistant metal, for example, a lead-based or Sn-based bearing metal, or a metal obtained by further adding spring properties to the alloy as required.

  In the differential device 10 configured as described above, for example, the output from the drive system is decelerated by a final reduction gear (not shown) and transmitted to the differential case 12 via the large-diameter bevel gear 14. When the differential case 12 is rotated around the axis of the side gear 20 (the axis of the drive shaft 24), the rotational driving force of the differential case 12 is transmitted through the pinion gear 22 to a pair of left and right side gears 20l, 20r. Torque is distributed and transmitted to the drive shaft 24 which is rotated integrally with the side gear 20.

  FIG. 2 is a diagram for explaining a vehicle rotary member retaining device 40 according to an embodiment of the present invention. Specifically, a structure for preventing the drive shaft 24 from being detached from the side gear 20 is illustrated. It is a figure shown roughly. 3 is a cross-sectional view taken along the line III-III of the drive shaft 24 and the snap ring 34 in FIG. 2 and 3 (and FIG. 4) schematically show the side gear 20, the drive shaft 24, and the like for convenience of explanation, and the dimensional ratios and the like of the respective parts are not necessarily drawn as in the actual case. Hereinafter, with reference to these drawings, the retainer device 40 for a vehicle rotating member according to the present embodiment will be described in detail.

  As shown in FIG. 2, the end of the side gear 20 on the inner peripheral portion on the small gear shaft 18 side (snap ring 34 side) is a surface so that the diameter dimension is gradually increased from the inner peripheral surface 42 to the side surface 44. A take-up portion 46 is formed. In a state where the drive shaft 24 is prevented from coming off from the side gear 20 by the snap ring 34, that is, in the state shown in FIG. 2, the snap ring 34 is brought into contact with the chamfer 46 of the side gear 20 and the Relative movement of the drive shaft 24 in the opposite direction of the small gear shaft 18 with respect to the side gear 20 by being brought into contact with a side wall (side wall facing the chamfered portion 46) 48 of the groove portion 32 in the drive shaft 24. Has been deterred. In other words, the drive shaft 24 is prevented from coming off from the side gear 20.

  As shown in FIGS. 2 and 3, in the vehicular rotating member retaining device 40 according to the present embodiment, a cushioning material 50 is interposed on the inner peripheral side of the snap ring 34 in the groove portion 32 of the drive shaft 24. . The cushioning material 50 is mainly composed of gel-like silicone (silicon resin), and is hardly deformed with respect to a high-frequency load corresponding to vibration during vehicle travel. Resin that easily deforms is suitably used for a low-frequency load when bending to the side (that is, a relatively low-speed load when the snap ring 34 is bent manually). Furthermore, it is desirable that the resin has a viscosity or fluidity that does not leave the groove 32 due to rotation of the drive shaft 24 or the like. As such a material, for example, Alpha Gel (αGEL: registered trademark) manufactured by Taika Co., Ltd. is preferably used. Further, the amount of the buffer material 50 is a diameter that allows the snap ring 34 to enter the inner peripheral side of the side gear 20 when it is assumed that the buffer material 50 provided in the groove portion 32 is not elastically deformed. It is desirable that an amount necessary and sufficient to suppress the inner side deflection to the size is stored in the groove portion 32.

  FIG. 4 is a view showing a state in which the snap ring 34 is bent inward and enters the inner peripheral side of the side gear 20, and the drive shaft 24 is disengaged from the state shown in FIG. As shown in FIG. 4, when the snap ring 34 is bent inward and enters the inner peripheral side of the side gear 20, the relative movement in the axial direction (withdrawing direction) of the drive shaft 24 with respect to the side gear 20 is caused. Permissible. In this state, the cushioning material 50 interposed on the inner peripheral side of the snap ring 34 in the groove portion 32 is crushed between the snap ring 34 and the groove portion 32. When a force is applied so as to bend the snap ring 34 to the inner peripheral side slowly by hand, the cushioning material 50 is easily deformed and does not prevent the snap ring 34 from bending inward. On the other hand, when a load to the inner peripheral side is applied to the snap ring 34 due to vibration during traveling of the vehicle, the inner side of the snap ring 34 is deformed by the cushioning material 50 with little deformation against the high frequency load. Therefore, it is possible to suitably prevent the side gear 20 from entering the inner peripheral side as shown in FIG. As described above, the shock absorbing material 50 is provided on the inner peripheral side of the snap ring 34 in the groove portion 32, so that the fitting performance of the snap ring 34 is improved without deteriorating workability at the time of assembly or the like. It can be made.

  Thus, according to this embodiment, silicone is used as the main material on the inner peripheral side of the snap ring 34 in the groove portion 32 for fitting the snap ring 34 formed on the outer peripheral portion of the first rotating member. Since the shock absorbing material 50 is interposed, the shock absorbing material 50 interposed on the inner peripheral side of the snap ring 34 against a high frequency load such as vibration during traveling of the vehicle causes the inside of the snap ring 34. While suppressing the deflection to the circumferential side, the snap ring 34 can be easily deflected to the inner circumferential side during assembly or disassembly. In other words, it is possible to provide the vehicle rotating member retaining device 40 that achieves both workability during assembly and the fitting performance of the snap ring 34.

  Moreover, since the said buffer material 50 comprises gel form, the buffer material 50 can be suitably hold | maintained at the inner peripheral side of the snap ring 34 in the said groove part 32. FIG.

  In addition, since the vehicle rotation member retaining device 40 has a structure for preventing the drive shaft 24 from coming off from the side gear 20 of the differential device 10, in the vehicle differential device 10, from the differential side gear 20. The drive shaft 24 can be suitably prevented from coming off.

  The preferred embodiments of the present invention have been described in detail with reference to the drawings. However, the present invention is not limited to these embodiments, and may be implemented in other modes.

  For example, in the above-described embodiment, the example in which the present invention is applied to the vehicle rotating member retaining device 40 that suppresses the drive shaft 24 from being detached from the side gear 20 has been described, but the present invention is not limited thereto. However, the present invention can be widely applied to structures that prevent the first rotating member from coming off from the second rotating member in the vehicle.

  Further, in the above-described embodiment, the buffer material 50 is held on the inner peripheral side of the snap ring 34 in the groove portion 32 by its own viscosity, but the buffer material 50 is held in the groove portion 32. For example, a film for preventing the buffer material 50 from being separated (outflowed) from the groove 32 on the outer peripheral side of the buffer material 50 (that is, between the buffer material 50 and the snap ring 34). May be provided.

  In addition, although not illustrated one by one, the present invention is implemented with various modifications within a range not departing from the gist thereof.

It is a figure explaining the differential gear to which this invention is applied suitably, Comprising: It is sectional drawing cut | disconnected by the plane containing the axial center of a small gear shaft, and the axial center of a drive shaft. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view for explaining a vehicle rotation member retaining device according to an embodiment of the present invention, and more specifically, schematically shows a structure for preventing a drive shaft from coming off from a side gear of a differential device. FIG. FIG. 3 is a cross-sectional view of the drive shaft and the snap ring in FIG. 2 taken along the line III-III. 3 is a view showing a state in which the snap ring is bent inward and enters the inner peripheral side of the side gear, and the drive shaft is pulled out from the state shown in FIG. 2 in the vehicle rotation member retaining device shown in FIG.

Explanation of symbols

20: Side gear (second rotating member)
24: Drive shaft (first rotating member)
32: Groove 34: Snap ring 40: Retaining device 50 for vehicle rotation member 50: Buffer material

Claims (3)

A first rotating member; a second rotating member provided on an outer peripheral side of the first rotating member; and an outer peripheral portion of the first rotating member and an inner peripheral portion of the second rotating member. And a snap ring for preventing a relative position change in the axial center direction of the first rotating member and the second rotating member from being provided to the first rotating member. A device for preventing a rotating member for a vehicle from being pulled out,
A cushioning material mainly composed of silicone is interposed on the inner peripheral side of the snap ring in a groove portion for fitting the snap ring formed on the outer peripheral portion of the first rotating member. A vehicular rotating member retaining device.   The vehicle cushioning member retaining device according to claim 1, wherein the cushioning material is in a gel form.   The vehicle rotation member retaining device according to claim 1 or 2, wherein the first rotation member is a drive shaft, and the second rotation member is a differential side gear.

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