JP2009154591A - Bearing device for driving wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce product cost, while surely preventing a stick slip sound generated by sudden relative sliding between opposed surfaces of a bearing part and an outside joint member over a long period. <P>SOLUTION: This bearing device for a driving wheel has an outer ring 50 forming double-row outside raceway surfaces 52 and 54 on the inner periphery, a hub wheel 10 and an inner ring 20 having a wheel installing flange 14 on one end and having double-row inside raceway surfaces 12 and 22 on the outer periphery, and double-row rolling elements 30 and 40 interposed between the outside raceway surfaces 52 and 54 of the outer ring 50 and the inside raceway surfaces 12 and 22 of the hub wheel 10 and the inner ring 20, and is provided by pressing and pressing in a stem part 66 extending from the outside joint member 62 of a constant velocity universal joint 60 in and to a shaft hole of the hub wheel 10. A thrust rolling bearing 80 rollingly held by a resin material or a rubber material 84 in a state of radially arranging a large number of needle-like rollers 82, is interposed between the opposed surfaces 63 and 24 of a shoulder part 61 of the outside joint member 62 and an inboard side end part 26 of the inner ring 20. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a drive wheel bearing device that rotatably supports drive wheels (front wheels of FF vehicles, rear wheels of FR vehicles, all wheels of 4WD vehicles), for example, with respect to a suspension system of an automobile.

  There are two types of wheel bearing devices for automobiles, one for a driven wheel and one for a drive wheel, and various types have been proposed according to the respective applications. For example, FIG. 16 shows a bearing device for a driving wheel, which includes a hub wheel 110 and an inner ring 120, double-row rolling elements 130 and 140, an outer ring 150, and a constant velocity universal joint 160 as main components.

  The hub wheel 110 has an inner raceway surface 112 on the outboard side formed on the outer peripheral surface thereof, and includes a wheel mounting flange 114 for mounting a wheel (not shown). Hub bolts 116 for fixing the wheel disc are implanted at equal intervals in the circumferential direction of the wheel mounting flange 114. An inner ring 120 is fitted to a small-diameter step portion 118 formed on the outer peripheral surface of the hub wheel 110, and an inner raceway surface 122 on the inboard side is formed on the outer peripheral surface of the inner ring 120. On the inner peripheral surface of the shaft hole of the hub wheel 110, a female spline 111 for connecting a constant velocity universal joint 160, which will be described later, so as to transmit torque is formed.

  The inner ring 120 is press-fitted into the small-diameter step portion 118 of the hub ring 110 with an appropriate tightening margin to prevent creep. An outboard-side inner raceway surface 112 formed on the outer peripheral surface of the hub wheel 110 and an inboard-side inner raceway surface 122 formed on the outer peripheral surface of the inner ring 120 constitute a double-row inner raceway surface. .

  The outer ring 150 is formed with double row outer race surfaces 152, 154 facing the inner race surfaces 112, 122 of the hub wheel 110 and the inner ring 120 on the inner circumferential surface, and a vehicle body mounting flange for mounting to the vehicle body (not shown). 156. The vehicle body attachment flange 156 is fixed to a knuckle extending from a vehicle suspension system (not shown) with a bolt or the like using an attachment hole 158.

  The bearing portion 170 has a double row angular contact ball bearing structure, and has inner raceway surfaces 112 and 122 formed on the outer peripheral surfaces of the hub wheel 110 and the inner ring 120 and outer raceway surfaces 152 and 154 formed on the inner peripheral surface of the outer ring 150. The rolling elements 130 and 140 are interposed therebetween, and the rolling elements 130 and 140 in each row are supported by the cages 132 and 142 at equal intervals in the circumferential direction.

  A pair of seals 134 and 144 that seal the annular space between the outer ring 150, the hub ring 110, and the inner ring 120 so as to be in sliding contact with the outer peripheral surfaces of the hub ring 110 and the inner ring 120 are formed at both ends of the bearing portion 170. Are fitted to the inner diameters of both ends of the inner wall, and prevent leakage of lubricant filled in the inside and intrusion of water and foreign matters from the outside.

  By connecting the outer joint member 162 of the constant velocity universal joint 160 to the hub wheel 110 described above, a bearing device for a drive wheel is configured. The outer joint member 162 of the constant velocity universal joint 160 is provided at one end of an intermediate shaft (not shown) constituting the drive shaft, and accommodates an internal part (not shown) composed of an inner joint member, a ball and a cage. And a stem portion 166 extending integrally from the base portion of the mouse portion 164 in the axial direction. A male spline 168 is formed on the outer peripheral surface of the stem portion 166 so as to be connected to the hub wheel 110 so as to be able to transmit torque.

  The stem portion 166 of the outer joint member 162 is press-fitted into the shaft hole of the hub wheel 110, and the male spline 168 formed on the outer peripheral surface of the stem portion 166 and the female spline 111 formed on the inner peripheral surface of the shaft hole of the hub wheel 110. The torque can be transmitted by fitting.

  At this time, the facing surface between the inboard side end of the inner ring 120 and the shoulder 161 of the outer joint member 162, that is, the end surface 124 of the inboard side end of the inner ring 120 and the end surface 163 of the shoulder 161 of the outer joint member 162. With the nut 172 tightened to the male threaded portion 165 formed at the end portion of the stem portion 166, the constant velocity universal joint 160 is fixed to the hub wheel 110 and a preload is applied to the bearing portion 170. Yes.

  By the way, in the drive wheel bearing device described above, the end surface 124 of the end portion on the inboard side of the inner ring 120 of the bearing portion 170 and the end surface 163 of the shoulder portion 161 of the outer joint member 162 are in contact with each other. For example, when the vehicle starts, there is a risk that a stick-slip noise, commonly referred to as a cuckling noise, may be generated between the end surface 124 of the inboard side end portion of the inner ring 120 of the bearing portion 170 and the end surface 163 of the shoulder portion 161 of the outer joint member 162. There is.

  This stick-slip noise is generated via the male and female splines 111 and 168 when rotational torque is applied from the outer joint member 162 of the constant velocity universal joint 160 to the hub wheel 110 of the bearing portion 170 that is stationary when the vehicle starts. The rotation torque is transmitted from the outer joint member 162 to the hub wheel 110, but is pressed into the hub wheel 110 due to the transmission torque fluctuation between the outer joint member 162 and the bearing portion 170 and the torsion of the outer joint member 162. A sudden slip occurs between the inboard end of the inner ring 120 and the shoulder 161 of the outer joint member 162. This sudden slip causes stick-slip noise.

  As a means for preventing the above-described stick-slip noise, a means (for example, a thrust bearing made of a disk-shaped sliding member is interposed between the opposed surfaces 124 and 163 of the bearing portion 170 and the outer joint member 162 (for example, Or a means in which a thrust rolling bearing, which is a ball bearing composed of an outer ring, a plurality of rolling elements, and an inner ring, is interposed between opposing surfaces 124 and 163 of the bearing portion 170 and the outer joint member 162 (for example, see FIG. , See Patent Document 2).

In these Patent Documents 1 and 2, the frictional resistance between the bearing portion 170 and the outer joint member 162 is increased by interposing a thrust bearing between the opposed surfaces 124 and 163 of the bearing portion 170 and the outer joint member 162. It is made small so that a stick slip noise is not generated without causing a sudden slip.
JP 2005-145315 A JP 2006-275174 A

  By the way, in the drive wheel bearing device disclosed in Patent Documents 1 and 2, as described above, a disk-shaped sliding member is formed between the opposed surfaces 124 and 163 of the bearing portion 170 and the outer joint member 162. Generation of stick-slip noise is prevented by interposing a thrust rolling bearing which is a thrust bearing or a ball bearing composed of an outer ring, a plurality of rolling elements and an inner ring.

  However, since the drive wheel bearing device of Patent Document 1 uses a sliding bearing as a thrust bearing, it has a higher coefficient of friction than a rolling bearing and it is difficult to completely prevent stick-slip noise over a long period of time. It is. Further, in the drive wheel bearing device of Patent Document 2, a rolling bearing is used as the thrust bearing, but as the rolling bearing, a ball bearing including an outer ring, a plurality of rolling elements and an inner ring is used. There is a problem that the number of parts is large and the cost of the drive wheel bearing device is increased.

  Accordingly, the present invention has been proposed in view of the above-described problems, and the object of the present invention is to provide a stick-slip sound generated by a sudden relative slip between the opposed surfaces of the bearing portion and the outer joint member for a long time. Another object of the present invention is to provide a bearing device for a drive wheel that can be reliably prevented and the product cost can be reduced.

  As technical means for achieving the above-mentioned object, the present invention includes an outer member having a double-row outer raceway surface formed on the inner periphery, a wheel mounting flange at one end, and a double-row inner track on the outer periphery. A hub ring comprising an inner member comprising a hub ring and an inner ring, and a double row rolling element interposed between the outer raceway surface of the outer member and the inner raceway surface of the inner member. In the drive wheel bearing device in which the stem portion extending from the outer joint member of the constant velocity universal joint is press-fitted into the shaft hole of the constant velocity universal joint and is spline-fitted, the distance between the opposing surfaces of the shoulder portion of the outer joint member and the end portion of the inner member Further, the present invention is characterized in that a thrust rolling bearing, which is rotatably held by a resin material or a rubber material in a state where a large number of needle rollers are radially arranged, is interposed.

  In the present invention, the thrust rolling is held by a resin material or a rubber material so as to be freely rollable in a state where a large number of needle rollers are radially arranged between the opposing surfaces of the shoulder portion of the outer joint member and the end portion of the inner member. By interposing the bearing, a sudden slip occurs between the bearing portion and the outer joint member due to transmission torque fluctuation between the bearing portion having the inner member and the outer joint member and torsion of the outer joint member. Therefore, the occurrence of stick-slip noise can be prevented in advance.

  In addition, this thrust rolling bearing has a structure in which a large number of needle rollers are radially arranged and is held by a resin material or a rubber material so as to be freely rollable. Slip noise can be completely prevented over a long period of time. Furthermore, since the thrust rolling bearing has a structure in which needle rollers are hardened with a resin material or a rubber material, the number of parts can be reduced.

  In the thrust rolling bearing according to the present invention, the thickness of the resin material or the rubber material can be arbitrarily selected. If the thickness of the resin material or rubber material is less than or equal to the outer diameter of the needle roller, the needle roller directly contacts the opposing surface of the shoulder of the outer joint member and the end of the inner member. As a result, smooth rolling can be achieved and stick-slip noise can be reliably prevented.

  Furthermore, in the present invention, a thrust rolling bearing in which the thickness of the resin material or rubber material is larger than the outer diameter of the needle roller is provided between the opposing surfaces of the shoulder portion of the outer joint member and the end portion of the inner member. It is desirable to have a structure sandwiched with a clamping force. A thrust rolling bearing in which the thickness of the resin material or rubber material is larger than the outer diameter of the needle roller is sandwiched between the facing surfaces of the shoulder portion of the outer joint member and the end portion of the inner member with a predetermined tightening force. If it is included, the thickness of the resin material or rubber material becomes the same as the outer diameter of the needle roller due to the deformation of the resin material or rubber material by the predetermined tightening force. Thereby, with the resin material or the rubber material whose thickness is the same as the outer diameter of the needle roller, it is possible to seal between the opposing surfaces of the shoulder portion of the outer joint member and the end portion of the inner member, It is possible to prevent the intrusion of foreign matters such as the above, and it becomes easy to ensure sealing performance.

  In the above-described configuration of the present invention, it is desirable to form a recess for accommodating a part of the thrust rolling bearing in one or both of the two opposing surfaces of the shoulder portion of the outer joint member and the end portion of the inner member. . This recess makes it possible to position the thrust rolling bearing in the radial direction between the opposed surfaces of the shoulder portion of the outer joint member and the end portion of the inner member.

  In the above-described configuration of the present invention, it is desirable to provide a restricting portion for preventing the axial movement of the thrust rolling bearing in the recess. This restricting portion can prevent the thrust rolling bearing from falling off from between the opposing surfaces of the shoulder portion of the outer joint member and the end portion of the inner member during transportation and handling in the manufacture of the drive wheel bearing device. Can improve the performance.

  In the above-described configuration of the present invention, it is desirable to press-fit the resin material of the thrust rolling bearing into the recess. The press-fitting into the recess prevents the thrust rolling bearing from falling off from between the opposing surfaces of the shoulder of the outer joint member and the end of the inner member during transportation and handling in the manufacture of the drive wheel bearing device. Can be improved.

  In the above-described configuration of the present invention, it is desirable that a lubricant be interposed between the two opposing surfaces of the shoulder portion of the outer joint member and the end portion of the inner member and the needle roller of the thrust rolling bearing. In this way, the lubricity of the thrust rolling bearing can be improved, the rolling resistance can be reduced, and stick-slip noise can be prevented for a longer period.

  In this drive wheel bearing device, a small-diameter step portion is formed on the outer peripheral surface of the hub wheel on which one inner raceway surface is formed, and an inner ring on which the other inner raceway surface is formed is press-fitted into the small-diameter step portion. In this case, the end of the inner ring is opposed to the shoulder of the outer joint member. Further, a small-diameter step portion is formed on the outer peripheral surface of the hub wheel on which one inner raceway surface is formed, and an inner ring on which the other inner raceway surface is formed is press-fitted into the small-diameter step portion. It is applicable also to the type which crimped the edge part of this, and it becomes a structure where the crimped part of the hub ring was made to oppose the shoulder part of an outer joint member in this case.

  Further, in addition to the type described above, the drive wheel bearing device has a pair of inner rings fitted on the outer peripheral surface of the hub wheel, an inner raceway surface on the outboard side is formed on the outer peripheral surface of one inner ring, and the other inner ring It is also applicable to the type in which the inner raceway surface on the inboard side is formed on the outer peripheral surface of the inner surface. In this case, the end of the other inner ring located on the inboard side is opposed to the shoulder of the outer joint member. .

  In the present invention, the thrust rolling is held by a resin material or a rubber material so as to be freely rollable in a state where a large number of needle rollers are radially arranged between the opposing surfaces of the shoulder portion of the outer joint member and the end portion of the inner member. It has a structure with a bearing. As a result, when a rotational torque is applied from the outer joint member of the constant velocity universal joint to the hub wheel of the bearing portion in a stationary state when the vehicle starts, the space between the bearing portion having the inner member and the outer joint member is reduced. Due to this transmission torque fluctuation and torsion of the outer joint member, there is no sudden slip between the bearing portion and the outer joint member. As a result, it is possible to prevent the occurrence of stick-slip noise, improve quietness, and eliminate a sense of discomfort for the passenger.

  Further, the thrust rolling bearing has a structure in which a large number of needle rollers are radially arranged so as to be freely rollable by a resin material or a rubber material. Therefore, since the friction coefficient is low with respect to the sliding bearing, stick-slip noise can be completely prevented over a long period of time. Further, since the thrust rolling bearing has a structure in which needle rollers are hardened with a resin material or a rubber material, the number of parts can be reduced and the cost of the product can be easily reduced.

  Embodiments of a drive wheel bearing device according to the present invention will be described in detail below. The drive wheel bearing device of the embodiment shown in FIG. 1 mainly includes hub wheels 10 and inner rings 20, which are inner members, double-row rolling elements 30, 40, an outer ring 50 which is an outer member, and a constant velocity universal joint 60. As a component. In the following description, the side closer to the outside of the vehicle in a state assembled to the vehicle is referred to as an outboard (left side in the drawing), and the side closer to the center is referred to as an inboard side (right side in the drawing).

  The hub wheel 10 has an inner raceway surface 12 on the outboard side formed on the outer peripheral surface thereof, and includes a wheel mounting flange 14 for mounting a wheel (not shown). Hub bolts 16 for fixing the wheel disc are implanted at equal intervals in the circumferential direction of the wheel mounting flange 14. An inner ring 20 is fitted to a small diameter step portion 18 formed on the outer peripheral surface of the hub wheel 10, and an inner raceway surface 22 on the inboard side is formed on the outer peripheral surface of the inner ring 20. A female spline 11 for connecting the constant velocity universal joint 60 so as to transmit torque is formed on the inner peripheral surface of the shaft hole of the hub wheel 10.

  The inner ring 20 is press-fitted into the small-diameter step portion 18 of the hub ring 10 with an appropriate tightening margin to prevent creep. The inner raceway 12 on the outboard side formed on the outer peripheral surface of the hub wheel 10 and the inner raceway surface 22 on the inboard side formed on the outer peripheral surface of the inner ring 20 constitute a double row inner raceway surface. .

  The outer ring 50 is formed with double row outer raceway surfaces 52 and 54 facing the inner raceway surfaces 12 and 22 of the hub wheel 10 and the inner ring 20 on the inner circumferential surface, and a vehicle body mounting flange for mounting to the vehicle body (not shown). 56. The vehicle body attachment flange 56 is fixed to a knuckle extending from a suspension device (not shown) of the vehicle body with a bolt or the like using an attachment hole 58.

  The bearing portion 70 has a double-row angular contact ball bearing structure and has inner raceway surfaces 12 and 22 formed on the outer peripheral surfaces of the hub wheel 10 and the inner ring 20 and outer raceway surfaces 52 and 54 formed on the inner peripheral surface of the outer ring 50. Rolling elements 30 and 40 are interposed therebetween, and the rolling elements 30 and 40 in each row are supported by the cages 32 and 42 at equal intervals in the circumferential direction.

  A pair of seals 34 and 44 that seal the annular space between the outer ring 50, the hub ring 10, and the inner ring 20 are provided at both ends of the bearing portion 70 so as to be in sliding contact with the outer peripheral surfaces of the hub ring 10 and the inner ring 20. Are fitted to the inner diameters of both end portions of the nozzle, and prevent leakage of grease filled therein and intrusion of water and foreign matters from the outside.

  By connecting the outer joint member 62 of the constant velocity universal joint 60 to the hub wheel 10 described above, a drive wheel bearing device is configured. The outer joint member 62 of the constant velocity universal joint 60 is provided at one end of an intermediate shaft (not shown) constituting the drive shaft, and accommodates an internal part (not shown) composed of an inner joint member, a ball and a cage. And a stem portion 66 integrally extending in the axial direction from the base portion of the mouse portion 64. A male spline 68 is formed on the outer peripheral surface of the stem portion 66 so as to be connected to the hub wheel 10 so as to be able to transmit torque.

  The stem portion 66 of the outer joint member 62 is press-fitted into the shaft hole of the hub wheel 10, and the male spline 68 formed on the outer peripheral surface of the stem portion 66 and the female spline 11 formed on the inner peripheral surface of the shaft ring of the hub wheel 10. The torque can be transmitted by fitting.

  In the drive wheel bearing device of this embodiment, a thrust rolling bearing 80 is interposed between the opposing surfaces 63 and 24 of the shoulder portion 61 of the outer joint member 62 and the inboard side end portion 26 of the inner ring 20, and the stem portion 66. The constant velocity universal joint 60 is fixed to the hub wheel 10 and a preload is applied to the bearing portion 70 by tightening a nut 72 to a male screw portion 65 formed at the end of the bearing. The thrust rolling bearing 80 is sandwiched between the opposing surfaces 63 and 24 of the shoulder portion 61 of the outer joint member 62 and the inboard side end portion 26 of the inner ring 20 with a predetermined tightening force by the nut 72. The constant velocity universal joint 60 and the hub wheel 10 can be fixed by bolts in addition to the nut 72 described above.

  The thrust rolling bearing 80 described above is in a ring shape in which a large number of needle rollers 82 are radially arranged as shown in FIG. As the material, a thermosetting resin, a thermoplastic resin, a thermoplastic elastomer, or the like can be used, and an optimum material may be selected from these in consideration of cost and performance.

  As the thermosetting resin, epoxy resin, phenol resin, polyimide resin, urethane resin, polyurea resin, acrylic urethane resin, fluororesin, unsaturated polyester resin, vinyl ester resin, acrylic resin, silicone resin, silane, etc. are suitable. It is. As the thermoplastic resin, polystyrene, polypropylene, polyethylene, ABS, acrylic resin, polyacetal, polyamide, polycarbonate, PBT, PET, PEEK, PPS and the like are suitable. Further, ester-based, olefin-based, urethane-based, amide-based, styrene-based, etc. are suitable as the thermoplastic elastomer. Moreover, CR, EPDM, NBR, SBR, etc. are applicable as a rubber material.

  In the drive wheel bearing device of this embodiment, a large number of needle rollers 82 are arranged radially between the opposed surfaces 63 and 24 of the shoulder portion 61 of the outer joint member 62 and the inboard side end portion 26 of the inner ring 20. In this state, a thrust rolling bearing 80 that is movably held by a resin material or a rubber material 84 is interposed. That is, the rollable needle rollers 82 are in contact with the facing surfaces 63 and 24 of the shoulder portion 61 of the outer joint member 62 and the inboard side end portion 26 of the inner ring 20. Opposing surfaces 63 and 24 of the shoulder portion 61 of the outer joint member 62 and the inboard side end portion 26 of the inner ring 20 are rolling surfaces of the needle rollers 82.

  As a result, when a rotational torque is applied from the outer joint member 62 of the constant velocity universal joint 60 to the hub wheel 10 of the bearing 70 in a stationary state when the vehicle starts, the bearing 70 and the outer joint having the inner ring 20 are loaded. Even if there is a fluctuation in transmission torque between the member 62 and the torsion of the outer joint member 62, the needle rollers 82 in the thrust rolling bearing 80 are connected to the shoulder 61 of the outer joint member 62 and the inboard side end 26 of the inner ring 20. By rolling on the opposing surfaces 63, 24, it is possible to prevent the occurrence of stick-slip noise without causing a sudden slip between the bearing portion 70 and the outer joint member 62.

  Further, the thrust rolling bearing 80 has a structure in which a large number of needle rollers 82 are radially arranged and held by a resin material or a rubber material 84 so as to be freely rollable. On the other hand, since the coefficient of friction is low, stick-slip noise can be completely prevented over a long period of time. Furthermore, since the thrust rolling bearing 80 has a structure in which the needle rollers 82 are hardened with a resin material or a rubber material 84, the number of parts can be reduced.

  In the thrust rolling bearing 80 in this embodiment, the thickness t of the resin material or rubber material 84 is made smaller than the outer diameter d of the needle rollers 82 (see FIG. 3). In this way, the needle roller 82 can be brought into direct contact with the opposed surfaces 63 and 24 of the shoulder portion 61 of the outer joint member 62 and the inboard side end portion 26 of the inner ring 20. The smoothness of the movement can be achieved and the occurrence of stick-slip noise can be reliably prevented.

  As another embodiment, a thrust rolling bearing 81 in which the thickness T of the resin material or rubber material 85 is larger than the outer diameter D of the needle roller 83 is used as the inboard of the shoulder portion 61 of the outer joint member 62 and the inner ring 20. It is also possible to adopt a structure in which the surfaces 63 and 24 facing the side end portion 26 are sandwiched with a predetermined tightening force (see FIGS. 4 and 5).

  4 shows a male screw formed at the end of the stem portion 66 with a thrust rolling bearing 81 interposed between the facing surfaces 63 and 24 of the shoulder portion 61 of the outer joint member 62 and the inboard side end portion 26 of the inner ring 20. 5 shows a state before the nut 72 is tightened to the portion 65, and FIG. 5 shows a state after the nut 72 is tightened to the male screw portion 65 formed at the end of the stem portion 66. FIG.

  In the state of FIG. 4, the thickness T of the resin material or rubber material 85 is set larger than the outer diameter D of the needle roller 83, so that the needle roller 83 is embedded in the resin material or rubber material 85. The needle rollers 83 are not in contact with the facing surfaces 63 and 24 between the shoulder portion 61 of the outer joint member 62 and the inboard side end portion 26 of the inner ring 20. From this state, when the nut 72 is tightened to the male screw portion 65 formed at the end portion of the stem portion 66, the resin material or the rubber material 85 is deformed as shown in FIG. Thus, the thickness is the same as the outer diameter of the needle roller 83. As a result, the needle roller 83 comes into contact with the facing surfaces 63 and 24 of the shoulder portion 61 of the outer joint member 62 and the inboard side end portion 26 of the inner ring 20.

  In this way, the shoulder portion 61 and the inner ring of the outer joint member 62 are made of the resin material or the rubber material 85 which is deformed by a predetermined tightening force by the nut 72 and has the same thickness as the outer diameter of the needle roller 83. It is possible to seal between the opposing surfaces 63 and 24 of the 20 inboard side end portions 26, and to prevent the entry of foreign matters such as moisture into the inside, so that it is easy to ensure sealing performance.

  In the embodiment shown in FIG. 5, the opposed surfaces 63 and 24 of the shoulder portion 61 of the outer joint member 62 and the inboard side end portion 26 of the inner ring 20 are flat surfaces, and the needle rollers 83 roll on the flat surfaces. 6 to 8, one or both of the two opposing surfaces 63 and 24 of the shoulder portion 61 of the outer joint member 62 and the inboard side end portion 26 of the inner ring 20 are described. In addition, recesses 91 and 92 for accommodating a part of the thrust rolling bearing 81 may be formed. In this case, the opposing surfaces in the recesses 91 and 92 become the rolling surfaces 91 b and 92 b of the needle rollers 83.

  FIG. 6 shows a case where a recess 91 is formed on the facing surface 63 of the shoulder 61 of the outer joint member 62. In this recess 91, the facing surface 63 between the shoulder portion 61 of the outer joint member 62 and the inboard side end portion 26 of the inner ring 20 is formed by a step portion 91 a located radially inward of the shoulder portion 61 of the outer joint member 62. The thrust roller bearing 81 can be positioned by restricting the movement of the needle rollers 83 in the radial direction between the two rollers 24.

  FIG. 7 shows a case where a recess 92 is formed on the facing surface 24 of the inboard side end portion 26 of the inner ring 20. In this recess 92, a facing surface 63 between the shoulder portion 61 of the outer joint member 62 and the inboard side end portion 26 of the inner ring 20 is formed by a stepped portion 92 a located radially outside the inboard side end portion 26 of the inner ring 20. , 24 is restricted from moving radially outward of the needle rollers 83, and the thrust rolling bearing 81 can be positioned.

  Further, FIG. 8 shows a case where the recesses 91 and 92 are formed on both facing surfaces 63 and 24 of the shoulder portion 61 of the outer joint member 62 and the inboard side end portion 26 of the inner ring 20. In the recesses 91 and 92, the outer joint member is formed by step portions 91a and 92a located on both sides of the radially inner side of the shoulder portion 61 of the outer joint member 62 and the radially outer side of the inboard side end portion 26 of the inner ring 20. The movement of the needle roller 83 to both the radially inner side and the radially outer side between the facing surfaces 63 and 24 of the shoulder portion 61 of the inner ring 20 and the inboard side end portion 26 of the inner ring 20 is restricted, and the thrust rolling bearing 81 Positioning is possible.

  In this case, it is possible to restrict the positions of the needle rollers 83 on both the radially outer side and the radially inner side of the opposite surfaces 63 and 24 of the shoulder portion 61 of the outer joint member 62 and the inboard side end portion 26 of the inner ring 20. Therefore, the positioning is more reliable than in the case shown in FIGS.

  9 and 10 show recesses 93 and 94 for accommodating the thrust rolling bearing 81 in one of the two opposed surfaces 63 and 24 of the shoulder portion 61 of the outer joint member 62 and the inboard side end portion 26 of the inner ring 20. In addition, an embodiment in which locking portions 93c and 94c as restricting portions for preventing axial movement of the thrust rolling bearing 81 are attached to the recesses 93 and 94 is shown. In this case, the facing surfaces in the recesses 93 and 94 become the rolling surfaces 93 b and 94 b of the needle rollers 83.

  The embodiment shown in FIG. 9 has a structure in which a recess 93 is formed in the facing surface 63 of the shoulder portion 61 of the outer joint member 62, and a locking portion 93 c is projected from the stepped portion 93 a of the recess 93. Further, the embodiment shown in FIG. 10 has a structure in which a recess 94 is formed in the facing surface 24 of the inboard side end portion 26 of the inner ring 20 and a locking portion 94c is projected from a step portion 94a of the recess 94. It has.

  In these embodiments, the thrust rolling bearing 81 is provided in the recesses 93 and 94 formed in one of the two opposing surfaces 63 and 24 of the shoulder portion 61 of the outer joint member 62 and the inboard side end portion 26 of the inner ring 20. The thrust rolling bearing 81 is prevented from moving in the axial direction by the locking portions 93c and 94c projecting from the step portions 93a and 94a of the recesses 93 and 94, thereby transporting the bearing device for driving wheel. The thrust rolling bearing 81 can be prevented from falling off between the facing surfaces 63 and 24 of the shoulder portion 61 of the outer joint member 62 and the inboard side end portion 26 of the inner ring 20 at the time and during handling, and the handling property can be improved. .

  11 and 12 show recesses 95 and 96 for accommodating the thrust rolling bearing 81 in one of the two opposing surfaces 63 and 24 of the shoulder portion 61 of the outer joint member 62 and the inboard side end portion 26 of the inner ring 20. In the embodiment, the resin material or the rubber material 85 of the thrust rolling bearing 81 is press-fitted into the recesses 95 and 96. In this case, the opposing surfaces in the recesses 95 and 96 become the rolling surfaces 95b and 96b of the needle roller 83.

  The embodiment shown in FIG. 11 has a structure in which a recess 95 in which a resin material or a rubber material 85 of the thrust rolling bearing 81 is press-fitted is formed on the facing surface 63 of the shoulder portion 61 of the outer joint member 62. Further, the embodiment shown in FIG. 12 has a structure in which a recess 96 into which a resin material or a rubber material 85 of the thrust rolling bearing 81 is press-fitted is formed on the facing surface 24 of the inboard side end portion 26 of the inner ring 20. .

  In these embodiments, a thrust rolling bearing 81 is provided in recesses 95 and 96 formed in one of two opposing surfaces 63 and 24 of the shoulder portion 61 of the outer joint member 62 and the inboard side end portion 26 of the inner ring 20. When the resin material or the rubber material 85 is press-fitted, the thrust rolling bearing 81 is connected to the shoulder portion 61 of the outer joint member 62 and the inboard side end portion 26 of the inner ring 20 at the time of transportation and handling in the manufacture of the drive wheel bearing device. Can be prevented from falling off between the opposed surfaces 63 and 24, and the handleability can be improved.

  In each embodiment described above, the two opposing surfaces 63, 24 of the shoulder portion 61 of the outer joint member 62 and the inboard side end portion 26 of the inner ring 20 and the needle rollers 82 of the thrust rolling bearings 80, 81, It is preferable to interpose a lubricant with 83. Thus, between the two opposing surfaces 63, 24 of the shoulder portion 61 of the outer joint member 62 and the inboard side end portion 26 of the inner ring 20 and the needle rollers 82, 83 of the thrust rolling bearings 80, 81, By interposing the lubricant, the lubricity of the thrust rolling bearings 80 and 81 is improved, the rolling resistance can be reduced, and the occurrence of stick-slip noise can be prevented for a longer period.

  In each of the above embodiments, the small diameter step portion 18 is formed on the outer peripheral surface of the hub wheel 10 on which one inner raceway surface 12 is formed, and the other inner raceway surface 22 is formed on the small diameter step portion 18. The case where the inner ring 20 is press-fitted into a drive wheel bearing device (see FIG. 1) has been described. However, the present invention is not limited to this, and for example, as shown in FIG. A small-diameter step portion 18 is formed on the outer peripheral surface of the hub wheel 10 on which the surface 12 is formed, and an inner ring 20 on which the other inner raceway surface 22 is formed is press-fitted into the small-diameter step portion 18. The present invention is also applicable to a drive wheel bearing device in which the end portion 18a of the portion 18 is crimped. In this case, the caulking portion 18 a of the hub wheel 10 that is an inward member is configured to face the shoulder portion 61 of the outer joint member 62.

  Further, as shown in FIGS. 14 and 15, a pair of inner rings 20a and 20b are fitted to the outer peripheral surface of the hub wheel 10, and an inner raceway surface 22a on the outboard side is formed on the outer peripheral surface of one inner ring 20a. The present invention can also be applied to a drive wheel bearing device in which the inner raceway surface 22b on the inboard side is formed on the outer peripheral surface of the other inner ring 20b. In this case, the other inner ring 20b located on the inboard side is connected to the outer joint member 62. It becomes the structure which was made to oppose with the shoulder part 61. FIG.

  In addition, in embodiment shown in FIGS. 13-15, the same part as FIGS. 1-3 is attached | subjected the same referential mark, and duplication description is abbreviate | omitted. In the embodiment shown in FIGS. 13 to 15, the thrust rolling bearing 80 in the embodiment of FIGS. 1 to 3 is applied, but the thrust rolling bearing 81 and its assembly structure shown in FIGS. 4 to 12 are applied. It is also possible to do.

  The present invention is not limited to the above-described embodiments, and can of course be implemented in various forms without departing from the gist of the present invention. It includes the equivalent meanings recited in the claims and the equivalents recited in the claims, and all modifications within the scope.

It is a longitudinal section showing an embodiment of a bearing device for drive wheels concerning the present invention. It is a side view which shows the thrust rolling bearing of FIG. It is a principal part enlarged view which shows the thrust rolling bearing of FIG. In another embodiment of the present invention, the thrust rolling bearing is interposed between the facing surfaces of the shoulder portion of the outer joint member and the inboard side end portion of the inner ring, and the state before applying a predetermined tightening force is shown. FIG. It is a principal part enlarged view which shows the state after giving predetermined | prescribed fastening force from the state of FIG. In other embodiment of this invention, it is a principal part enlarged view which shows the structure which formed the recess in the shoulder part of an outer joint member. It is a principal part enlarged view which shows the structure which formed the recess in the inboard side edge part of an inner ring | wheel in other embodiment of this invention. In other embodiment of this invention, it is a principal part enlarged view which shows the structure which formed the recess in both the shoulder part of an outer joint member, and the inboard side edge part of an inner ring | wheel. In other embodiment of this invention, it is a principal part enlarged view which shows the structure which formed the recess in the shoulder part of the outer joint member, and protruded the latching | locking part in the step part of the recess. In other embodiment of this invention, it is a principal part enlarged view which shows the structure which formed the recess in the inboard side edge part of the inner ring | wheel, and provided the latching | locking part in the step part of the recess. In other embodiment of this invention, it is a principal part enlarged view which shows the structure which formed the recess in the shoulder part of the outer joint member, and press-fit the resin material or rubber material of the thrust rolling bearing in the recess. FIG. 5 is an enlarged view of a main part showing a structure in which a recess is formed in an inboard side end portion of an inner ring and a resin material or a rubber material of a thrust bearing is press-fitted into the recess in another embodiment of the present invention. It is a longitudinal cross-sectional view which shows embodiment which applied this invention to the bearing apparatus for drive wheels of the type which crimped the edge part of the small diameter step part of a hub ring. It is a longitudinal cross-sectional view which shows embodiment which applied this invention to the bearing apparatus for drive wheels of the type which fitted a pair of inner ring | wheel to the outer peripheral surface of the hub ring. It is a longitudinal cross-sectional view which shows embodiment which applied this invention to the bearing apparatus for other types of drive wheels which fitted a pair of inner ring | wheel to the outer peripheral surface of the hub ring. It is a longitudinal cross-sectional view which shows the prior art example of the bearing apparatus for drive wheels.

Explanation of symbols

10 Inner member (hub ring)
12 Inner raceway surface 14 Wheel mounting flange 20 Inner member (inner ring)
22 Inner raceway surface 24 Opposing surface 26 End (inboard side end)
30, 40 Rolling element 50 Outer member (outer ring)
52, 54 Outer raceway surface 60 Constant velocity universal joint 61 Shoulder portion 62 Outer joint member 63 Opposing surface 66 Stem portion 80, 81 Thrust rolling bearing 82, 83 Needle roller 84, 85 Resin material or rubber material 91-96 Recess 91b ~ 96b Rolling surface 93c, 94c Restriction part (locking part)

Claims (8)

  An outer member having a double row outer raceway surface formed on the inner periphery, a wheel mounting flange at one end and a double row inner raceway surface on the outer periphery, and an inner member comprising a hub wheel and an inner ring; A double row rolling element interposed between the outer raceway surface of the outer member and the inner raceway surface of the inner member, and extending from the outer joint member of the constant velocity universal joint to the shaft hole of the hub wheel In a drive wheel bearing device in which a portion is press-fitted and spline-fitted, a state in which a large number of needle rollers are radially arranged between the opposing surfaces of the shoulder portion of the outer joint member and the end portion of the inner member A drive wheel bearing device characterized in that a thrust rolling bearing that is rotatably held by a resin material or a rubber material is interposed.   The drive wheel bearing device according to claim 1, wherein the thrust rolling bearing has a resin material or a rubber material having a thickness smaller than an outer diameter of the needle roller.   A thrust rolling bearing in which the thickness of the resin material or rubber material is larger than the outer diameter of the needle roller, with a predetermined tightening force between the opposing surfaces of the shoulder portion of the outer joint member and the end portion of the inner member. The drive wheel bearing device according to claim 1, wherein the drive wheel bearing device is sandwiched.   The recess which accommodates a part of thrust rolling bearing was formed in one of the two opposing surfaces of the shoulder part of the said outer joint member, and the edge part of an inner member. Drive wheel bearing device.   The recessed part which accommodates a part of thrust rolling bearing was formed in both of the two opposing surfaces of the shoulder part of the said outer joint member, and the edge part of an inner member. Drive wheel bearing device.   The bearing apparatus for drive wheels as described in any one of Claims 1-4 which provided the control part which prevents the axial direction movement of the said thrust rolling bearing in the said recess.   The drive wheel bearing device according to any one of claims 1 to 4, wherein a resin material or a rubber material of the thrust rolling bearing is press-fitted into the recess.   The lubricant is interposed between the two opposing surfaces of the shoulder portion of the outer joint member and the end portion of the inner member and the needle roller of the thrust rolling bearing. The bearing apparatus for drive wheels as described in a term.

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