JP2007211817A - Constant velocity universal joint with torque transmission wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive constant velocity universal joint with a torque transmission wheel superior in durability, by preventing generation of an abnormal sound and vibration by a transmission shock when inputting torque. <P>SOLUTION: A plurality of axially extending interferential projection strips 8 are arranged in an outer peripheral equally divided position of a joint outer ring 2, and an interferential fitting groove 11 fitted by a clearance δ in the rotational direction with the interferential projection strips 8, is formed on the inner periphery of a sprocket 10 fitted to the outside of the joint outer ring 2. Recessed part 9 and 12 are formed on an outer diameter surface of the interferential projection strips 8 and the inner periphery of an interferential fitting groove 11, and generation of the abnormal sound and the vibration is prevented by absorbing the transmission shock when inputting the torque by a vibration control material 20 incorporated into its recessed parts 9 and 12. A relative rotation quantity of the joint outer ring 2 and the sprocket 10 is also regulated by interference between the interferential projection strips 8 and the interferential fitting groove 11, and reduction in the durability of the vibration control material 20 is restrained by preventing the vibration control material 20 from being elastically deformed more than necessary. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a constant velocity joint with a torque transmission wheel in which a torque transmission wheel such as a sprocket or a pulley is mounted on an outer peripheral surface of a joint outer ring.

  As a power transmission device that drives the drive wheels of a vehicle, a sprocket is attached to the joint outer ring of a constant velocity joint to which power from the engine is transmitted, and rotational torque from the engine is input to or output from the sprocket. Conventionally known are those which transmit the rotational torque to the drive wheels.

  In a constant velocity joint incorporated in a power transmission device, since a relatively large driving force is transmitted, it is necessary to firmly connect the sprocket to the joint outer ring, and a spline coupling method is generally used for the coupling. It has been adopted.

  By the way, in the constant velocity joint with torque transmission wheel that spline-couples the joint outer ring and sprocket, a large number of spline teeth extending in the axial direction are formed on the outer periphery of the joint outer ring, while the spline teeth are fitted on the inner periphery of the sprocket. Since it is necessary to provide the spline groove to be processed, there is a problem that the processing is troublesome and the cost is high.

  Also, when spline coupling is adopted by spline teeth large diameter alignment or tooth surface alignment, the spline teeth formed on the outer periphery of the joint outer ring and the phase of the spline grooves provided on the inner periphery of the sprocket are used. Since it is necessary to press-fit after matching, and since it is necessary to apply a relatively large axial force to the sprocket from the initial stage of the press-fitting, there is a problem that it takes a lot of time for coupling.

  In order to solve such a problem, it is effective to use a fitting in which a gap is formed between the mating surfaces of the spline teeth and the spline groove. There arises a problem that noise or vibration occurs due to a transmission shock at the time of torque input.

  Also, in the method of spline coupling the joint outer ring and the sprocket, it is necessary to provide a mechanism for positioning the sprocket in the axial direction, so the number of parts increases, and the mounting part of the positioning part must be processed into a joint outer ring or sprocket. Therefore, there is a problem that the cost becomes high.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a constant velocity joint with a torque transmission wheel which is low in cost and excellent in durability and capable of preventing the generation of noise and vibration due to a transmission shock during torque input.

  In order to solve the above-described problems, in the present invention, in a constant velocity joint with a torque transmission wheel in which a torque transmission wheel is attached to the outer periphery of a joint outer ring, it extends in the axial direction to a circumferentially equal position on the outer periphery of the joint outer ring. Interference ridges are provided, and interference interference grooves are formed at the circumferentially equal positions on the inner periphery of the torque transmission wheel to engage the interference ridges with a required rotational clearance. A configuration in which a vibration isolating material is provided between the inner diameter surface of the groove and the outer diameter surface of the interference protrusion is employed.

  In the present invention, a configuration is adopted in which a recess in which the vibration isolator is fitted is provided on at least one of the inner diameter surface of the interference fitting groove and the outer diameter surface of the interference protrusion.

  As described above, the interference outer rim formed on the outer periphery of the joint outer ring and the interference fitting groove provided on the inner periphery of the torque transmission wheel are fitted with a rotational clearance so that the outer side of the joint outer ring is Torque transmission wheels can be easily fitted to each other, and the interference protrusions and the interference fitting grooves extend in the axial direction, so that they can be easily formed by forging and low-cost torque transmission. A constant velocity joint with a ring can be obtained.

  In addition, since a vibration isolating material is provided between the inner diameter surface of the interference fitting groove and the outer diameter surface of the interference protrusion, the transmission shock during torque input can be absorbed by elastic deformation of the vibration isolating material. In addition to preventing abnormal noise and vibration, if excessive torque is applied and a large shearing force is applied to the antivibration material, the opposing ridges and the opposing side surfaces of the interference fitting groove come into contact with each other. Since the torque is received at the contact surface, the vibration isolator can be prevented from being deformed abnormally, and a constant velocity joint with a torque transmission wheel having excellent durability can be obtained.

  Furthermore, if a recess for fitting the vibration isolator is provided on at least one of the inner diameter surface of the interference fitting groove and the outer diameter surface of the interference protrusion, the impact of the end surface facing the recess in the axial direction of the vibration isolator is provided. Accordingly, the torque transmission wheel can be positioned in the axial direction, so that it is not necessary to separately provide a positioning mechanism in the axial direction of the torque transmission wheel, and the cost can be reduced.

  Embodiments of the present invention will be described below with reference to the drawings. As shown in the figure, as the constant velocity joint 1, here, three track grooves 3 are formed at an interval of 120 ° on the inner periphery of the joint outer ring 2, and a tripod member 4 incorporated in the joint outer ring 2 is formed. Is provided with three leg shafts 5 facing each track groove 3, and a tripod type constant speed in which a spherical roller 6 rotatably supported by each leg shaft 5 is allowed to roll along each track groove 3. Joints are shown.

  On the outer periphery of the joint outer ring 2, an arcuate groove portion 7 extending in the axial direction is provided at a bisected position of the adjacent track groove 3, and between the groove portions 7, that is, the outer wall portion of each track groove 3 extends in the axial direction. An extending interference protrusion 8 is provided.

  A sprocket 10 as a torque transmission wheel is fitted to the outside of the joint outer ring 2. An interference fitting groove 11 into which each interference protrusion 8 of the joint outer ring 2 is fitted is formed on the inner periphery of the sprocket 10, and between the interference fitting groove 11 and the fitting surface of the interference protrusion 8. Is provided with a rotation direction clearance δ.

  Concave portions 9 and 12 that are opposed to each other in the radial direction are formed on the outer diameter surface of the interference protrusion 8 and the inner diameter surface of the interference fitting groove 11, and the vibration prevention is made of an elastic member such as rubber in the recesses 9 and 12. A material 20 is incorporated. The vibration isolator 20 is fixed to the inner surfaces of the recesses 9 and 12 through a means by adhesion.

  As described above, the recesses 9 and 12 are formed in the outer diameter surface of the interference protrusion 8 and the inner diameter surface of the interference fitting groove 12, and the vibration damping material 20 is incorporated in the recesses 9 and 12. The vibration isolator 20 is elastically deformed at the time of input, and the transmission shock upon torque input is absorbed by the elastic deformation.

  For this reason, generation | occurrence | production of abnormal noise and a vibration can be prevented. When excessive torque is applied, the opposing side surfaces of the interference protrusion 8 and the interference fitting groove 11 come into contact with each other, and the relative rotation of the joint outer ring 2 and the sprocket 10 is restricted. For this reason, it can prevent that the vibration isolator 20 deform | transforms abnormally, and can suppress the fall of durability of the vibration isolator 20.

  As shown in the embodiment, by providing the recesses 9 and 12 on the outer diameter surface of the interference protrusion 8 and the inner diameter surface of the interference fitting groove 11, and incorporating the vibration isolator 20 in the recesses 9 and 12, With this vibration isolator 20, the sprocket 10 can be positioned in the axial direction.

  For this reason, it is not necessary to provide a positioning mechanism for the sprocket 10 separately, and the cost can be reduced.

  In the embodiment, the recesses 9 and 12 are provided on the outer diameter surface of the interference protrusion 8 and the inner diameter surface of the interference fitting groove 11, respectively. A recess may be provided only on one of the inner diameter surfaces of the fitting groove 11 for use.

  Further, the concave portion may be omitted, and the vibration isolator 20 may be incorporated between the outer diameter surface of the interference protrusion 8 and the inner diameter surface of the interference fitting groove 11. In either case, the vibration isolator 20 is bonded to both the joint outer ring 2 and the sprocket 10 so that the vibration isolator 20 is elastically deformed when the joint outer ring 2 and the sprocket 10 are rotated relative to each other.

  In the embodiment, the tripod type constant velocity joint is shown as the constant velocity joint, but the constant velocity joint is not limited to this. For example, a double offset type constant velocity joint may be used.

  Furthermore, although the sprocket 10 is shown as a torque transmission wheel, a pulley, a gear, etc. can be mentioned as a torque transmission wheel.

A longitudinal front view showing an embodiment of a constant velocity joint with a torque transmission wheel according to the present invention Sectional view along the line II-II in FIG.

Explanation of symbols

2 Joint outer ring 8 Interference protrusion 9 Recess 10 Sprocket (torque transmission wheel)
11 Interference fitting groove 12 Recess

Claims (2)

In constant velocity joints with torque transmission wheels with torque transmission wheels attached to the outer periphery of the joint outer ring,
Interference ridges extending in the axial direction are provided at circumferentially equally spaced positions on the outer periphery of the joint outer ring, and the interference ridges are fitted with circumferential clearance equally spaced on the inner periphery of the torque transmitting wheel with a required rotational clearance. A constant velocity joint with a torque transmission wheel, wherein a fitting groove for interference is formed, and a vibration isolating material is provided between the inner diameter surface of the interference fitting groove and the outer diameter surface of the interference protrusion.   2. The constant velocity joint with a torque transmission wheel according to claim 1, wherein a concave portion into which the vibration isolator is fitted is provided in at least one of the inner diameter surface of the interference fitting groove and the outer diameter surface of the interference protrusion.

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