JP2007223459A - Method of manufacturing power transmission mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a power transmission mechanism provided with a bearing device for a wheel facilitated in accurate machining for preventing the vibration of a flange and capable of restricting the occurrence of brake judder. <P>SOLUTION: The bearing device 51 for a wheel is provided with a hub wheel 2 having the flange 1 extended outward in the radial direction, a fixed constant velocity universal joint 4 having an outside joint member 3 fixed to the hub wheel 2, an outer member 5 arranged on the peripheral side of the hub wheel 2 and the outside joint member 3, and a rolling body 6 interposed between the outer member 5, the hub wheel 2 and the outside joint member 3. After forming a full assembly S by fitting the bearing device 51 for a wheel and a sliding constant velocity universal joint 52 to a shaft 50, turning is performed to a brake rotor side fitting surface 21 of the hub wheel 2, while rotating the hub wheel 2 and the outside joint member 3 around the shaft center O in the state in which the outer member 5 of the full assembly S is fixed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a method for manufacturing a power transmission mechanism.

  For example, in a power transmission system (power transmission mechanism) of an automobile, a power transmission shaft that transmits power from a speed reducer (differential) to drive wheels may be called a drive shaft (drive shaft). In particular, a drive shaft used in an FF vehicle requires a large operating angle and constant velocity during front wheel steering, and also requires a function of absorbing axial displacement in relation to the suspension system. Part (one end) is connected to the speed reducer side through a sliding type constant velocity universal joint such as a double offset type constant velocity universal joint or tripod type constant velocity universal joint, and the other end (the other end) In many cases, a mechanism that couples the drive wheel to the drive wheel via a fixed constant velocity universal joint such as a barfield type constant velocity universal joint (sometimes referred to as a Zepper joint) is used.

  By the way, in the wheel bearing device, what is called a first generation or a second generation in which a pair of inner rings are mounted (press-fitted) on the hub wheel, a first bearing surface (rolling surface) is formed on the outer periphery of the hub wheel. There is a so-called third generation, and a so-called fourth generation in which the fixed type constant velocity universal joint is incorporated (Patent Document 1 and Patent Document 2).

  For example, as shown in FIG. 9, the fourth generation wheel bearing device includes a hub wheel 102 having a flange 101 extending in the outer diameter direction, and a constant velocity universal joint in which an outer joint member 103 is fixed to the hub wheel 102. (Fixed constant velocity universal joint) 104, the outer member 105 disposed on the outer peripheral side of the hub wheel 102 and the outer joint member 103, and the hub wheel 102, the outer joint member 103, and the outer member 105. And an intervening rolling element 106.

  The constant velocity universal joint 104 includes an outer joint member 103, an inner joint member 108 disposed in the bowl-shaped portion 107 of the outer joint member 103, and the inner joint member 108 and the outer joint member 103. A rolling element 109 is provided, and a holder 110 that holds the rolling element 109. Further, the end of the shaft 111 is inserted and fixed to the inner joint member 108, and a boot 112 that closes the opening of the hooked portion 107 of the outer joint member 103 is connected to the shaft 111 and the hooked portion 107 of the outer joint member 103. It is installed.

  The hub wheel 102 has a cylindrical portion 113 and the flange 101, and a raceway surface 114 is provided on the outer peripheral surface of the cylindrical portion 113 on the side of the flange portion 107. Then, the shaft portion 115 of the outer joint member 103 is inserted into the tube portion 113 of the hub wheel 102 so that the hub wheel 102 and the outer joint member 103 are integrated. A raceway surface 119 is provided on the outer peripheral surface of the outer joint member 103.

  The outer member 105 has two rows of raceway surfaces 116 and 117 on its inner periphery, and a flange (vehicle body mounting flange) 118 on its outer periphery. Then, one raceway surface 116 of the outer member 105 and the raceway surface 114 of the hub wheel 102 face each other, the other raceway surface 117 of the outer member 105 and the raceway surface 119 of the outer joint member 103 face each other, A rolling element 106 is interposed between them.

A hub bolt 120 for mounting a brake rotor and a wheel (not shown) to the flange 101 is mounted on the flange 101 of the hub wheel 102. That is, the brake rotor is overlaid on the mounting surface 121 of the flange 101 of the hub wheel 102, and the flange 101 and the brake rotor are connected via the hub bolt 120. Further, the vehicle body attachment flange 118 of the outer member 105 is attached to the vehicle body by bolt fastening.
JP 2003-49853 A JP-A-2005-349928

  As described above, the brake rotor and the wheel are mounted on the flange 101 on the flange 101 of the hub wheel 102, and the brake rotor is sandwiched between the calipers, whereby the wheel is decelerated and stopped.

  For this reason, when the rotational runout of the brake rotor is large, a vibration phenomenon called a brake judder occurs during braking. As a cause of brake rotor runout, there is flange runout. By reducing this, brake judder can be suppressed. Therefore, it is necessary to finish the mounting surface 121 of the flange 101 with high accuracy so that the flange runout does not occur.

  Conventionally, each part (member) is finished with high accuracy and then assembled. Therefore, in order to increase the accuracy of preventing the vibration of the mounting surface 121 of the flange 101, it is necessary to finish each component with high accuracy.

  However, even if each part is finished with high accuracy, the accuracy after assembling is the accumulation of the accuracy of the individual components, so it is difficult to ensure the flange runout prevention accuracy of the wheel bearing device after assembly. It was. In addition, if high-precision finishing of each component is performed, the manufacturing operation time as a whole increases and the manufacturing cost increases.

  In view of the above problems, the present invention provides a power transmission mechanism including a wheel bearing device that can easily perform high-precision machining that can prevent flange runout and can suppress generation of brake judder. A manufacturing method is provided.

  The power transmission mechanism manufacturing method of the present invention includes a shaft, a wheel bearing device mounted on one end of the shaft, and a sliding constant velocity universal joint mounted on the other end of the shaft. In the mechanism manufacturing method, the wheel bearing device includes a hub wheel having a flange extending in an outer diameter direction, a fixed constant velocity universal joint having an outer joint member fixed to the hub wheel, a hub wheel and an outer joint member. An outer member disposed on the outer peripheral side, a rolling element interposed between the outer member and the hub wheel and the outer joint member, and a wheel bearing device and a sliding constant velocity universal joint on the shaft Then, with the outer member of the full assembly body fixed, the hub wheel and the outer joint member are rotated around the assembly body axis while the flange of the hub wheel is Turning the mounting surface on the brake rotor side It is intended.

  After forming a full assembly body in which the wheel bearing device and the sliding constant velocity universal joint are assembled to the shaft, the mounting surface of the flange is finished. That is, since the mounting surface is finished after assembling the power transmission mechanism, the mounting surface of the flange can be processed with high accuracy without processing the single component with high accuracy.

  As a bearing device for a wheel, even if the shaft portion of the outer joint member is inserted into the hole portion of the hub wheel and the hub wheel and the outer joint member are integrated, the shaft portion of the hub wheel is connected to the outer joint member. The hub wheel and the outer joint member may be integrated with each other.

According to the method for manufacturing a drive transmission mechanism of the present invention, since it is not necessary to process a single component with high accuracy, it is possible to reduce the manufacturing cost and the manufacturing operation time. In addition, since the flange mounting surface is turned after the wheel bearing device and the sliding constant velocity universal joint are assembled to the shaft, the flange runout can be regulated with high accuracy. Thereby, generation | occurrence | production of the brake judder of the wheel bearing apparatus of a drive transmission mechanism can be suppressed effectively.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  FIG. 1 shows a drive transmission mechanism manufactured by the method of manufacturing a drive transmission mechanism of the present invention. The drive transmission mechanism includes a shaft 50, a wheel bearing device 51 mounted on one end 50 a of the shaft 50, And a slidable constant velocity universal joint 52 attached to the other end 50b of the shaft 50.

  The wheel bearing device 51 is called a fourth generation in which a constant velocity universal joint is incorporated, and a hub wheel 2 having a flange 1 extending in an outer diameter direction, and an outer joint member 3 is fixed to the hub wheel 2. The fixed constant velocity universal joint 4, the outer member 5 disposed on the outer peripheral side of the hub wheel 2 and the outer joint member 3, and the outer member 5, the hub wheel 2 and the outer joint member 3. And a rolling element 6 to be mounted.

  As shown in FIG. 2, the fixed type constant velocity universal joint 4 includes the outer joint member 3, an inner joint member 8 disposed in the bowl-shaped portion 7 of the outer joint member 3, and the inner joint member 8. And a ball 9 disposed between the outer joint member 3 and a cage 10 that holds the ball 9. The outer joint member 3 is provided with a cylindrical shaft portion 15 projecting from the base portion (bottom portion) of the bowl-shaped portion 7, and a raceway surface 19 is formed on the outer periphery on the base side of the bowl-shaped portion 7. .

  Track grooves 8 a are formed on the outer peripheral surface of the inner ring as the inner joint member 8, and the same number of tracks as the track grooves 8 a of the inner joint member 8 are formed on the inner peripheral surface of the hook-shaped portion 7 of the outer joint member 3. A groove 7 a is formed, and a plurality of balls 9 that transmit torque are incorporated between the track groove 7 a of the outer joint member 3 and the track groove 8 a of the inner joint member 8.

  As shown in FIG. 1, one end portion 50 a of the shaft 50 is inserted and fixed to the inner joint member 8. That is, a spline portion 47 is provided in the center hole of the inner ring 46 as the inner joint member 8, and one end portion 50 a of the shaft 50 is inserted into the center hole of the inner ring 46, and the spline portion 48 of the one end portion 50 a and the inner ring 46 are inserted. The spline portion 47 is engaged.

  Further, a boot 53 that closes the opening of the flange portion 7 of the outer joint member 3 is attached to the shaft 50 and the flange portion 7 of the outer joint member 3. That is, the large-diameter portion 53a of the boot 53 is externally fitted to the opening end portion of the bowl-shaped portion 7 of the outer joint member 3, and the boot band 54 is fastened to the large-diameter portion 53a from the outer diameter direction in this state. Further, the small-diameter portion 53b of the boot 53 is fitted on the boot mounting portion 55 of the shaft 50, and the boot band 54 is fastened to the small-diameter portion 53b from the outer diameter direction in this state.

  Next, as shown in FIG. 2, the hub wheel 2 includes a cylindrical portion 13 and the flange 1, and a raceway surface 14 is provided on the outer peripheral surface of the cylindrical portion 13 on the saddle-shaped portion 7 side. Then, the shaft portion 15 of the outer joint member 3 is inserted (press-fitted) into the tube portion 13 of the hub wheel 2 so that the hub wheel 2 and the outer joint member 3 are integrated. In this case, an uneven portion 34 is provided on the inner peripheral surface of the hub wheel 2 on the side of the concave portion, and the convex portion of the uneven portion 34 is provided on the outer peripheral surface of the shaft portion 15 of the outer joint member 3 on the side of the negative portion. Plastic bonding. That is, by expanding the diameter of the shaft portion 15 of the outer joint member 3, the convex portion of the uneven portion 34 is plastically joined to the outer peripheral surface of the shaft portion 15.

  The outer member 5 is provided with two rows of raceway surfaces 16 and 17 on its inner periphery, and a flange (vehicle body mounting flange) 18 on its outer periphery. Then, one raceway surface 16 of the outer member 5 and the raceway surface 14 of the hub wheel 2 face each other, the other raceway surface 17 of the outer member 5 and the raceway surface 19 of the outer joint member 3 face each other, The rolling elements 6 are interposed between these. The rolling element 6 is held by a cage 11, and a screw hole 24 is provided in the vehicle body mounting flange 18.

  A hub bolt 20 for mounting a brake rotor and a wheel (not shown) to the flange 1 is mounted on the flange 1 of the hub wheel 2. That is, a plurality of through holes (press-fit holes) 22 are provided in the flange 1 at a predetermined pitch along the circumferential direction, and the bolts 20 are press-fitted into the through-holes 22. The hub bolt 20 includes a head portion 20a, a screw shaft portion 20b, and a serration portion 20c between the screw shaft portion 20b and the head portion 20a. The serration portion 20 c is press-fitted into the through hole 22.

  The brake rotor is superposed on the brake rotor side mounting surface 21 of the flange 1 of the hub wheel 2, and the flange 1 and the brake rotor are connected via the hub bolt 20. Further, the vehicle body attachment flange 18 of the outer member 5 is attached to the vehicle body by bolt fastening.

  Note that seals 23 and 23 are attached to both ends of the outer member 5. That is, the seal 23 prevents foreign matter from entering the bearing and prevents leakage of grease filled in the bearing.

  Further, as shown in FIG. 1, the sliding type constant velocity universal joint 52 includes an outer joint member 60, a tripod member 61 as an inner joint member, and a roller 62 as a torque transmission member as main components. Furthermore, a boot 63 is provided.

  The outer joint member 60 includes a mouth portion 64 and a stem portion 65 that are integrally formed. The mouse part 64 has a cup shape opened at one end, and a track groove extending in the axial direction is formed at a position of the inner circumference in the circumferential direction.

  The tripod member 61 includes a boss portion 66 and a leg shaft 67. The boss portion 66 is provided with a spline portion 68 on the inner peripheral surface of the center hole thereof, the other end portion 50b of the shaft 50 is inserted into the center hole of the boss portion 66, and the spline portion 69 of the other end portion 50b The spline portion 68 of the boss portion 66 is engaged. The leg shaft 67 protrudes in the radial direction from the circumferentially divided position of the boss portion 66. Each leg shaft 67 of the tripod member 61 carries a roller 62.

  Further, the boot 63 is attached to the mouth portion 64 by tightening the boot band 54 with the large-diameter portion 63a of the boot 63 fitted on the outer peripheral surface of the mouth portion 64 on the opening side. Further, the small diameter portion 63 b of the boot 63 is fitted on the shaft 50, and the boot band 54 is fastened to attach the boot 63 to the shaft 50.

  By the way, when such a drive transmission mechanism is used, it is necessary to prevent flange runout in order to prevent a vibration phenomenon called brake judder that occurs during braking. Therefore, in the present invention, the brake rotor side mounting surface 21 is turned.

  Next, a method of turning the brake rotor side mounting surface 21 with the turning device M having the holding means 25 as shown in FIG. 1 will be described. At this time, first, the full assembly S in which the wheel bearing device 51 and the sliding constant velocity universal joint 52 are assembled to the shaft 50 is formed. In the wheel bearing device, the seals 23 and 23 are attached.

  In such a state where the assembly (full assembly body) S is held by the outer member 5 by the holding means 25, the hub wheel 2 and the outer joint member 3 of the constant velocity universal joint 4 are connected to the assembly body axis O. The brake rotor side mounting surface 21 is turned by rotating around the axis of the outer joint member 3.

  The holding means 25 includes a base portion 26 and a chuck claw mechanism 27 protruding from the base portion 26. Further, the chuck claw mechanism 27 includes a first claw member 28 that receives the cylindrical main body 5a of the outer member 5, and a second claw member that supports the side surface 18a of the flange 18 of the outer member 5 on the side opposite to the wheel mounting flange. 29. The first claw member 28 can be reciprocated in the radial direction perpendicular to the axis O as indicated by arrows A and B in FIG. 1 by a drive mechanism (reciprocating mechanism) (not shown).

  In addition, the entire sliding type constant velocity universal joint 52 and a part of the fixed type constant velocity universal joint 4 are accommodated in the base portion 26, and the stem portion of the outer joint member 60 of the sliding type constant velocity universal joint 52 is accommodated in the base portion 26. A conical support portion 70 is provided which is fitted in 65 and supports the slidable constant velocity universal joint 52 side of the drive transmission mechanism.

  The turning device M configured as described above includes a motor (not shown) in a state where the stem portion 65 of the outer joint member 60 of the sliding type constant velocity universal joint 52 is supported by the support portion 70 of the base portion 26. The support shaft member 30 connected to the output shaft of the drive mechanism such as the like is inserted into the shaft portion 15 of the outer joint member 3. At this time, the tip chuck portion 29a of the second claw member 29 is brought into contact with the side surface 18a of the flange 18 of the outer member 5, and the first claw member 28 is moved from the outer diameter direction to the outer member 5 as indicated by an arrow A. The tip chuck portion 28 a is brought into contact with the outer peripheral surface of the cylindrical main body portion 5 a of the outer member 5 by approaching the outer member 5. The support shaft member 30 includes an insertion shaft portion 30a that is inserted into the shaft portion 15 of the outer joint member 3, and a protruding shaft portion 30b that protrudes from the insertion shaft portion 30a.

  In this way, by driving the drive mechanism such as the motor in the set state, the hub wheel 2 and the outer joint member 3 can be rotated around the axis O while the outer member 5 is fixed. it can. In this rotated state, the turning head 33 having the turning blade 32 is operated in the radial direction as indicated by arrows C and D, whereby the turning surface 32 turns the brake rotor side mounting surface 21. Thereby, finishing of the brake rotor side mounting surface 21 can be performed. In this finishing process, the hub ring end face runout (flange runout) can be 20 μm or less.

  According to the method for manufacturing a drive transmission mechanism of the present invention, since it is not necessary to process a single component with high accuracy, it is possible to reduce the manufacturing cost and the manufacturing operation time. In addition, since the mounting surface 21 is turned after the hub wheel 2, the outer joint member 3, the outer member 5, and the rolling elements 6 are assembled, the flange runout can be regulated with high accuracy. Thereby, generation | occurrence | production of the brake judder of the wheel bearing apparatus of a drive transmission mechanism can be suppressed effectively.

  Next, FIG. 3 shows a modification of the wheel bearing device. In this wheel bearing device, the uneven portion 34 of the hub wheel 2 of FIG. 2 is omitted, and the shaft portion 15 of the outer joint member 3 is replaced with the hub wheel 2. It is press-fitted into. 3 is the same as the configuration of the wheel bearing device shown in FIG. 1, and therefore, in FIG. 3, the same configuration as the configuration of the wheel bearing device shown in FIG. The same reference numerals as those in FIG.

  Therefore, even in the wheel bearing device shown in FIG. 3, like the wheel bearing device shown in FIG. 2, the turning device M shown in FIG. The mounting surface 21 of the flange can be turned with the dynamic constant velocity universal joint assembled.

  4 and 5, the shaft portion 15 of the outer joint member 3 is a cylindrical body. In these wheel bearing devices, a spline portion 35 is formed on the outer peripheral surface of the shaft portion 15 on the side of the saddle-shaped portion, and the spline portion 35 of the shaft portion 15 is formed on the inner peripheral surface of the hub wheel 2 on the side of the concave shape portion. A meshing spline portion 36 is formed. Further, in the wheel bearing device shown in FIG. 5, the end portion of the shaft portion 15 is protruded from the cylindrical portion 13 of the hub wheel 2, and the protruding portion is caulked in the outer diameter direction to form a caulking portion 38. Yes. Since the other structure of the wheel bearing device shown in FIGS. 4 and 5 is the same as the structure of the wheel bearing device shown in FIG. 2, the structure of the wheel bearing device shown in FIG. About the same structure, the same code | symbol as FIG. 2 is attached | subjected and the description is abbreviate | omitted.

  By the way, in the wheel bearing apparatus shown in FIGS. 4 and 5, since the shaft portion 15 of the outer joint member 3 is not cylindrical, it cannot be supported by the support shaft member 30 as shown in FIG. For this reason, as the support member, a member that fits into the wheel pilot 12 of the hub wheel 2 or the like is used.

  Therefore, even in the wheel bearing device shown in FIGS. 4 and 5, the wheel bearing device and the sliding type constant velocity universal joint are assembled to the shaft as in the wheel bearing device shown in FIG. Thus, the mounting surface 21 of the flange can be turned.

In the wheel bearing device shown in FIGS. 6 and 7, the shaft portion 40 is provided in the hub wheel 2, and the through hole 41 is provided in the bottom portion of the flange portion 7 of the outer joint member 3. It is inserted into the through hole 41 of the outer joint member 3.

  That is, the hub wheel 2 in this case includes a solid hub wheel main body portion 42 having the flange 1 on the outer periphery and the shaft portion 40 protruding from the hub wheel main body portion 42. A conical recess 43 is provided on the end surface on the shaft side.

  In the wheel bearing device shown in FIG. 6, the shaft portion 40 of the hub wheel 2 is press-fitted into the through hole 41 of the outer joint member 3. In the wheel bearing device shown in FIG. 7, the spline portion 44 is provided on the outer peripheral surface of the shaft portion 40 of the hub wheel 2, and the spline portion of the hub wheel 2 is formed on the inner peripheral surface of the through hole 41 of the outer joint member 3. A spline portion 45 that meshes with 44 is formed.

  Further, in the wheel bearing device shown in FIG. 8, the hub wheel main body portion 42 and the shaft portion 40 each have a cylindrical shape, and an uneven portion 45 a is formed on the inner peripheral surface of the through hole 41 of the outer joint member 3. The outer peripheral surface of the shaft portion 40 of the hub wheel 2 is plastically joined to the convex portion of the portion 45a.

  Since the other structure of the wheel bearing device shown in FIGS. 6 to 8 is the same as the structure of the wheel bearing device shown in FIG. 1, the structure of the wheel bearing device shown in FIG. About the same structure, the same code | symbol as FIG. 2 is attached | subjected and the description is abbreviate | omitted.

  Therefore, even in the wheel bearing device shown in FIGS. 6 to 8, the wheel bearing device and the sliding type constant velocity universal joint are assembled to the shaft as in the wheel bearing device shown in FIG. Thus, the mounting surface 21 of the flange can be turned.

  As mentioned above, although it demonstrated per embodiment of this invention, this invention can be variously deformed without being limited to the said embodiment, For example, the tapered roller was used for the rolling element 6 as a wheel bearing apparatus. The sliding constant velocity universal joint may be a sliding constant velocity universal joint other than the tripod type constant velocity universal joint.

It is sectional drawing of the processing state in the manufacturing method of the drive transmission mechanism of this invention. It is a principal part expanded sectional view of the drive transmission mechanism processed with the manufacturing method of the drive transmission mechanism of this invention. It is an expanded sectional view of the 1st modification of the bearing device for wheels. It is an expanded sectional view of the 2nd modification of the bearing device for wheels. It is an expanded sectional view of the 3rd modification of a wheel bearing device. It is an expanded sectional view of the 4th modification of a bearing device for wheels. It is an expanded sectional view of the 5th modification of a wheel bearing device. It is an expanded sectional view of the 6th modification of a wheel bearing device. It is sectional drawing of the conventional drive transmission mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flange 2 Hub wheel 3 Outer joint member 4 Fixed type constant velocity universal joint 5 Outer member 6 Rolling body 21 Brake rotor side mounting surface 50 Shaft 50a One end part 50b Other end part 51 Wheel bearing device 52 Sliding type constant velocity free Joint O Shaft center S Full assembly body

Claims (3)

  In a method of manufacturing a power transmission mechanism comprising a shaft, a wheel bearing device mounted on one end of the shaft, and a sliding type constant velocity universal joint mounted on the other end of the shaft, the wheel bearing device includes: A hub wheel having a flange extending in the outer diameter direction, a fixed type constant velocity universal joint having an outer joint member fixed to the hub wheel, and an outer member disposed on the outer peripheral side of the hub wheel and the outer joint member And a rolling element interposed between the outer member and the hub wheel and the outer joint member, and a full assembly body is formed by assembling the wheel bearing device and the sliding type constant velocity universal joint on the shaft. Then, turning the hub rotor and the outer joint member around the axis of the assembly body while turning the outer member of the full assembly body, turning the brake rotor side mounting surface of the flange of the hub wheel. Manufacture of characteristic power transmission mechanism Method.   2. The method of manufacturing a power transmission mechanism according to claim 1, wherein the wheel bearing device integrates the hub wheel and the outer joint member by inserting the shaft portion of the outer joint member into the hole of the hub wheel. .   2. The method of manufacturing a power transmission mechanism according to claim 1, wherein the wheel bearing device integrates the hub wheel and the outer joint member by inserting the shaft portion of the hub wheel into the hole of the outer joint member. .

Images