JP2019107994A - Wheel support device of vehicle - Google Patents

Abstract

To provide a wheel support device capable of measuring a connection part easily and directly and performing the measurement precisely and stably in an inspection process before connection by forming the connection part of a constant velocity joint with a hub unit as a relatively simple shape.SOLUTION: A wheel support device 1 of a vehicle connects a hub unit 4 to which a wheel is attached and a constant velocity joint 3 which is provided on an end part of a drive shaft 2 along a center axis CL mutually and rotatably supports the wheel in such a condition as to be capable of transmitting torque from the drive shaft. An outer ring 12 of the constant velocity joint 3 includes: a central convex part 23 which protrudes on a hub wheel 31 side; and a plurality of outside convex parts 22 which are disposed around it. The hub wheel 31 includes: a central concave part 37 which opens on the outer ring 12 side and is fitted in such a condition that the central convex part 23 abuts on a bottom surface 37a; and a plurality of outside concave parts 38 which are disposed around its opening and in which the plurality of outside convex parts 22 are fitted to each other.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wheel support device for a vehicle, and more particularly to a wheel support device for a vehicle that connects a wheel and a drive shaft and rotatably supports the wheel in a state capable of transmitting torque from the drive shaft.

  Conventionally, as a wheel support device of this type, for example, the one described in Patent Document 1 is known. The wheel support device includes a constant velocity joint provided on the drive shaft side, and a hub unit connected to the constant velocity joint and rotatably supporting a wheel with respect to a suspension system of the vehicle. The constant velocity joint is provided at the distal end portion of the drive shaft, and specifically, an outer ring provided on the outer side of the inner ring with the inner ring fixed to the distal end portion of the drive shaft and a plurality of balls interposed. And so on. The outer ring is formed in a convex shape projecting toward the hub unit, and has an outer ring cylindrical portion having a large diameter and an outer ring shaft portion having a smaller diameter than the outer ring cylindrical portion and protruding in a tapered shape from the outer ring cylindrical portion. Have. A plurality of drive teeth are formed in an annular shape at an end of the outer ring cylindrical portion on the hub unit side. Further, in the outer ring shaft portion, a hole penetrating in the axial direction is formed, and a female screw is formed on the inner peripheral surface of the hole.

  On the other hand, the hub unit has a hub wheel attached to the wheel and connected to the constant velocity joint, and a bearing rotatably supporting the hub wheel and attached to the suspension. The hub wheel is configured by a thick cylindrical hub shaft, a flange portion provided on the wheel side, and the like. At the end of the hub shaft on the constant velocity joint side, side face splines that mesh with the outer ring cylinder of the constant velocity joint are formed. The side face spline has a plurality of driven teeth corresponding to a plurality of drive teeth of the outer ring portion on the constant velocity joint side, and these driven teeth are formed in an annular shape.

  In the hub unit configured as described above, all the driven teeth of the side face splines of the hub wheel mesh with all the drive teeth of the outer ring portion of the constant velocity joint, and the outer ring shaft portion of the constant velocity joint is the hub wheel Is inserted inside the Then, a cap bolt is inserted from the flange side of the hub unit to the inside of the hub wheel and screwed into the hole of the outer ring shaft of the constant velocity joint, whereby the hub unit is connected to the constant velocity joint.

  In the above hub unit, when producing a side face spline having a large number of driven teeth, each driven tooth is based on a virtual pitch surface as a meshing position between each driven tooth and each drive tooth of the constant velocity joint. The dimensions, such as tooth flank shape, tooth lines and pitch, are designed, and based thereon, side face splines are produced. In addition, the above-mentioned hub unit is required to have high dimensional accuracy as a whole, and in particular, the driven teeth of the side face splines have very high dimensions in order to smoothly transmit the torque from the constant velocity joint to the wheel. Accuracy is required.

  For this reason, in Patent Document 1, in the inspection step after manufacturing the hub unit, the inspection is performed using a reference setting tool that has a plurality of teeth the same as the drive teeth of the constant velocity joint and is formed of an annular block. To be executed. Specifically, the reference setting tool is mounted in mesh with the side face spline of the hub unit, and the hub unit is set in a predetermined three-dimensional measuring device. Then, a predetermined reference surface is set by measuring the upper surface or the side surface of the reference setting tool, and then after the reference setting tool is removed from the hub unit, the set reference for the driven tooth of the side face spline of the hub unit Based on the surface, various dimensions are measured, such as the dimensions of the tooth surface, the arrangement pitch, and the concentricity with respect to the center of rotation. Thus, it is checked whether the side face splines are properly produced.

JP, 2013-50402, A

  As mentioned above, the hub unit of the conventional wheel support device is formed with a side face spline having a plurality of driven teeth. This side face spline is manufactured on the basis of a virtual pitch surface, and furthermore, since each driven tooth has a three-dimensional complicated shape, the side face spline is complicated to manufacture and takes time and effort. In addition, when inspecting the hub unit, it is necessary to prepare in advance a reference setting tool that engages with the side face spline, and the driven tooth of the side face spline based on the reference surface set using the reference setting tool. In this case, the error is larger than in the direct measurement, and accurate dimensional measurement may not be stably performed.

  The present invention has been made to solve the problems as described above, and by providing the connecting portion of the constant velocity joint and the hub unit with a relatively simple shape, the constant velocity joint to the hub unit can be smoothly manufactured. It is possible to provide a wheel support device capable of easily and directly measuring the above-mentioned connection portion in the inspection step before connection of both in addition to securing a proper torque transmission, and performing the measurement accurately and stably. The purpose is to

  In order to achieve the above object, in the invention according to claim 1, the hub unit 4 to which the wheel is attached and the constant velocity joint 3 provided at the end of the drive shaft 2 are mutually separated by predetermined axes (in the embodiment Hereinafter, the same is the wheel support device 1 of a vehicle which is connected along the central axis CL) and supports the wheels rotatably in a state capable of transmitting the torque from the drive shaft. An inner ring 11 fixed to the drive shaft, and an outer ring 12 disposed on the outer side of the inner ring and rotatable integrally with the drive shaft; and a hub unit having a wheel attached thereto and connected to the outer ring 31 and a bearing 32 rotatably supporting the hub wheel, wherein the outer ring is centered on the axis and protrudes toward the hub wheel along the axis, and a central convex portion having a predetermined length and diameter 3 and a plurality of outer projections 22 disposed outside the proximal end of the central projection and along the circumferential direction of the axis, each extending in the radial direction of the axis and projecting a predetermined length toward the hub wheel The hub wheel is open to the outer ring side and has a predetermined diameter centered on the axis and a predetermined depth extending along the axis, with the central projection in contact with the bottom surface 37a. The central recess 37 to be fitted, and the opening of the central recess are disposed outside along the circumferential direction of the axis, and each open to the outer ring side, and the parallel side walls 38a extending in the radial direction of the axis and facing each other 38a, and has a plurality of outer recesses 38 in which a plurality of outer protrusions are respectively fitted.

  According to this configuration, the constant velocity joint includes the inner ring and the outer ring, and the outer ring is disposed on the outer side of the central protrusion protruding toward the hub wheel and the base end of the central protrusion. And an outer convex portion. On the other hand, the hub unit comprises a hub wheel and a bearing, and the hub wheel has a central recess and a plurality of outer recesses which respectively fit in the central protrusion and the plurality of outer protrusions of the constant velocity joint . When the constant velocity joint and the hub unit are connected, the central convex portion of the constant velocity joint is fitted in contact with the bottom surface of the central recess of the hub unit. Since the central convex portion of the constant velocity joint and the central concave portion of the hub unit are both formed around and along the predetermined axis, the central convex portion is fitted to the central concave portion in the state described above. By combining them, centering and end face positioning of the hub unit with respect to the constant velocity joint can be performed easily and appropriately. Further, when the constant velocity joint and the hub unit are connected, the outer convex portion of the outer ring of the constant velocity joint is fitted to the outer concave portion of the hub wheel of the hub unit. Thus, the outer ring of the constant velocity joint and the hub wheel of the hub unit are coupled to each other in a state capable of transmitting torque, and torque from the drive shaft is smoothly transmitted to the wheels through the outer ring of the constant velocity joint and the hub wheel. can do.

  The connection between the constant velocity joint and the hub unit, that is, the central and outer convex portions of the constant velocity joint, and the central recess and the outer recess of the hub unit are those of the conventional constant velocity joint and hub unit described above. It has a very simple shape compared to the corresponding part. For this reason, in the inspection step before connection after production of the constant velocity joint and the hub unit of the present invention, the central convex portion, the outer convex portion, the central concave portion and the outer concave portion are directly connected using a simple measuring instrument. It is possible to measure the dimensions. Therefore, the measurement of the connection portion between the constant velocity joint and the hub unit can be performed accurately and stably.

  According to a second aspect of the present invention, in the wheel support device of the first aspect, the hub wheel has an axial center and extends along the axis, and a through hole 34 having a predetermined diameter is formed. The convex portion is formed with a screw hole 23b centered on the axis and extending along the axis, and in the hub wheel, a bolt (fastening bolt 5) having substantially the same diameter as the through hole is inserted into the through hole and screwed It is characterized in that it is fastened to the outer ring by being screwed into the hole.

  According to this configuration, the hub wheel can be firmly fastened to the outer ring of the constant velocity joint by inserting the bolt into the through hole of the hub wheel and screwing it into the screw hole of the central convex portion of the constant velocity joint. In addition, since the diameter of the through hole of the hub wheel and the diameter of the bolt are almost the same, there is almost no gap between the inner circumferential surface of the through hole of the hub wheel and the outer circumferential surface of the bolt. In this state, the hub wheel is fastened to the outer ring of the constant velocity joint. As a result, torque from the drive shaft can be smoothly transmitted to the wheel attached to the hub wheel without rattling between the outer ring and the hub wheel.

1 is a cross-sectional view of a wheel support device of a vehicle according to an embodiment of the present invention. It is sectional drawing which shows the state before connection of the constant velocity joint and hub unit in the wheel supporting apparatus of FIG. It is a figure for demonstrating the structure of the connection part of a constant velocity joint and a hub unit, (a) is sectional drawing of a hub unit, (b) is a center recessed part and multiple when a hub unit is seen from the constant velocity joint side. 4 (c) is a cross-sectional view of the constant velocity joint when viewed from the hub unit side of the constant velocity joint, and FIG. 4 (d) is a cross-sectional view of the constant velocity joint.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a wheel support device of a vehicle according to an embodiment of the present invention. The wheel support device 1 is applied to a vehicle such as a car, and rotatably supports wheels in a state capable of transmitting torque from the drive shaft 2.

  As shown in FIGS. 1 and 2, the wheel supporting device 1 includes a constant velocity joint 3 provided at one end of a drive shaft 2, a hub unit 4 connected to the constant velocity joint 3, and the hub unit 4. And a fastening bolt 5 for fastening to the constant velocity joint 3.

  The constant velocity joint 3 includes an inner ring 11 fixed to the end of the drive shaft 2, an outer ring 12 disposed outside the inner ring 11 and provided to cover the inner ring 11 and the ends of the drive shaft 2, and an inner ring A plurality of (only two are shown in FIGS. 1 and 2) balls 13 provided between the outer ring 12 and the outer ring 12 and a cage 14 rotatably holding the balls 13 are provided. It is possible to rotate integrally with the drive shaft 2 within the range of the operating angle of.

  As shown in FIG. 2, the outer ring 12 of the constant velocity joint 3 is formed into a dome-shaped outer ring dome portion 21 that bulges out on the outer side of the vehicle (hereinafter referred to as “outer side”; left side in FIGS. A plurality of outer projections 22 provided on the outer periphery of the top of the outer ring dome 21 and fitted in a plurality of outer recesses 38 of the hub unit 4 to be described later, and protruding from the top of the outer ring dome 21 toward the outer side And a central protrusion 23 fitted in a central recess 37 (described later) of the hub unit 4. The outer ring dome portion 21 is formed so that the inner side of the vehicle (hereinafter referred to as the “inner side”; right side in FIGS. 1 and 2) is opened, and a portion between the open portion and the drive shaft 2 is a bellows. It is covered by the boot 24 formed in the shape of a circle.

  FIG. 3 shows the structure of the connecting portion of the constant velocity joint 3 and the hub unit 4 shown in FIG. As shown in FIGS. 7C and 7D, the plurality of (12 in this embodiment) outer convex portions 22 provided around the top of the outer ring dome portion 21 have a drive shaft 2 and a constant velocity joint 3. The hub unit 4 and the hub unit 4 are radially disposed equiangularly in the circumferential direction around a central axis CL (a predetermined axis) extending through the rotation center of the hub unit 4. Each outer convex portion 22 extends in the radial direction of the central axis line CL and protrudes a predetermined length to the outer side, and a state when viewed from the outer side (state shown in FIG. 3C) is a predetermined constant in the circumferential direction. It is formed in a rectangular shape having a width.

  Further, the central convex portion 23 protruding from the top of the outer ring dome portion 21 is formed in a cylindrical shape having a predetermined length and diameter, and the tip end surface 23a is formed flat. Further, the central convex portion 23 is formed with a screw hole 23b which is open to the outer side and which extends around the central axis CL and along a predetermined length.

  On the other hand, the hub unit 4 includes a hub wheel 31 having a predetermined shape, and a bearing 32 rotatably supporting the hub wheel 31. The hub wheel 31 is formed in a multistage cylindrical shape centered on the central axis line CL and extending along a predetermined length. Further, the hub wheel 31 is formed with a through hole 34 extending around and along the central axis CL and having substantially the same diameter as the shaft portion of the fastening bolt 5 as shown in FIG. As shown, the fastening bolt 5 is inserted into the through hole 34. Further, a flange 35 is provided at the outer end of the hub wheel 31, and a plurality of (only one is shown in each figure) bolts 36 for fixing the wheel are attached to the flange 35.

  The bearing 32 includes an inner ring 41 fixed in a state of being crimped to the outer periphery of an inner end portion of the hub wheel 31, and an outer ring 42 provided so as to cover the outer periphery of the inner ring 41 and the body portion of the hub wheel 31; Between the inner ring 41 and the outer ring 42 and between the hub wheel 31 and the outer ring 42, a plurality of balls 43 and 44 (shown in two rows for each row) provided in two rows, and balls 43 in each row , 44, and seals 47, 48 for closing the gap between the inner ring 41 and the outer ring 42, and between the hub wheel 31 and the outer ring 42, respectively.

  The outer ring 42 is provided with a flange 49, and a plurality of (only one is shown in each figure) holes 49a for inserting a bolt are formed in the flange 49. The outer ring 42 of the bearing 32 is fixed to a suspension system (not shown) of the vehicle via a bolt inserted into the hole 49a.

  As shown in FIG. 2, on the inner side of the hub wheel 31, there is formed a central recess 37 which communicates with the through hole 34 and into which the central protrusion 23 of the constant velocity joint 3 is fitted. The central recess 37 is opened to the inner side, and has a predetermined diameter centered on the central axis CL and a predetermined depth extending along the central axis CL. More specifically, the central recess 37 has an inner diameter and depth which is larger than the inner diameter of the through hole 34 and substantially the same as the outer diameter and the projection length of the central protrusion 23 of the constant velocity joint 3. 37a is formed flat.

  Further, as shown in FIGS. 3A and 3B, each of the end portions on the inner side of the hub wheel 31 is opened to the inner side, and fitted to the plurality of outer convex portions 22 of the constant velocity joint 3 respectively. A plurality of (12 in this embodiment) outer recesses 38 are provided. The outer recesses 38 are radially disposed equiangularly in the circumferential direction around the central axis CL. Each outer recess 38 extends in the radial direction of the central axis line CL, and the state as viewed from the inner side (the state shown in FIG. 3B) is formed into a rectangular shape having a predetermined predetermined width in the circumferential direction There is. Each outer recess 38 has parallel side walls 38a, 38a facing each other and has a predetermined depth.

  The hub unit 4 configured as described above is connected to the constant velocity joint 3 in the following state. That is, the central convex portion 23 of the constant velocity joint 3 is fitted to the central concave portion 37 of the hub wheel 31, and the plurality of outer convex portions 22 of the constant velocity joint 3 are respectively fitted to the plurality of outer concave portions 38 of the hub wheel 31 Do. In this case, the outer peripheral surface of the central protrusion 23 is in close contact with the inner peripheral surface of the central recess 37, and the end surface 23a is in contact with the bottom surface 37a of the central recess 37. On the other hand, the side surfaces 22a and 22a (see FIG. 3 (c)) of the plurality of outer protrusions 22 are in close contact with the side walls 38a and 38a (see FIG. 3 (b)) of the corresponding outer recess 38 respectively. Do. The tip end surface of each outer protrusion 22 has a slight gap with the bottom surface of the corresponding outer recess 38.

  Then, the fastening bolt 5 is inserted into the through hole 34 of the hub wheel 31 and screwed into the screw hole 23 b of the central convex portion 23. Thus, the hub wheel 31 of the hub unit 4 is firmly fastened to the outer ring 12 of the constant velocity joint 3.

  As described above, according to the wheel support device 1 of the present embodiment, both the central convex portion 23 of the constant velocity joint 3 and the central concave portion 37 of the hub unit 4 are centered on the central axis CL and to the central axis CL Since the center convex portion 23 is fitted to the central concave portion 37 in the above-described state, the centering and end face positioning of the hub unit 4 with respect to the constant velocity joint 3 can be easily and appropriately made. Can be done. Further, the outer races 12 of the constant velocity joint 3 and the hub wheel 31 of the hub unit 4 transmit torque to each other by fitting the outer protrusions 22 of the constant velocity joint 3 to the outer recesses 38 of the hub unit 4. It is connected in a possible state, and the torque from the drive shaft 2 can be smoothly transmitted to the wheels via the outer ring 12 and the hub wheel 31 of the constant velocity joint 3.

  Further, the connection portion between the constant velocity joint 3 and the hub unit 4, that is, the central convex portion 23 and the outer convex portion 22 of the constant velocity joint 3, and the central concave portion 37 and the outer concave portion 38 of the hub unit 4 It has a very simple shape as compared to their corresponding parts of the unit. For this reason, in the inspection step before connection after production of the constant velocity joint 3 and the hub unit 4 of the present embodiment, a simple measuring instrument (for example, an outside diameter micrometer and an inside diameter micrometer) is used to It is possible to directly measure the dimensions of the projection 23, the outer projection 22, the central recess 37 and the outer recess 38. Therefore, the measurement of the connection portion between the constant velocity joint 3 and the hub unit 4 can be performed accurately and stably.

  Furthermore, since the fastening bolt 5 for fastening the constant velocity joint 3 and the hub unit 4 has an axial diameter substantially the same as the diameter of the through hole 34 of the hub wheel 31, the inner peripheral surface of the through hole 34 of the hub wheel 31 and the fastening bolt There is almost no gap with the outer peripheral surface of 5. Therefore, the hub wheel 31 is fastened to the outer ring 12 of the constant velocity joint 3 in a state where the hub wheel 31 and the fastening bolt 5 are integrated. As a result, the torque from the drive shaft 2 can be smoothly transmitted to the wheel attached to the hub wheel 31 without rattling between the outer ring 12 and the hub wheel 31.

  In addition, this invention can be implemented in various aspects, without being limited to the said embodiment described. For example, in the embodiment, the number of the outer projections 22 of the constant velocity joint 3 and the number of the outer recesses 38 of the hub unit 4 are twelve, but the number is not particularly limited, and the torque from the drive shaft 2 It is possible to set to various numbers if properly transmitted. Further, the configurations of the constant velocity joint 3 and the details of the hub unit 4 shown in the embodiment are merely examples, and can be appropriately changed within the scope of the present invention.

1 wheel support device 2 drive shaft 3 constant velocity joint 4 hub unit 5 fastening bolt (bolt)
11 inner ring 12 outer ring 21 outer ring dome portion 22 outer convex portion 23 central convex portion 23a front end surface 23b of central convex portion screw hole 31 of central convex portion hub wheel 32 bearing 34 through hole 37 central recess 38 outer recess CL central axis (predetermined Axis)

Claims (2)

A hub unit to which a wheel is attached and a constant velocity joint provided at an end of a drive shaft are mutually connected along a predetermined axis, and the wheel can be freely rotated in a state capable of transmitting torque from the drive shaft. A wheel support device of a supporting vehicle,
The constant velocity joint includes an inner ring fixed to the drive shaft, and an outer ring disposed outside the inner ring and rotatable integrally with the drive shaft.
The hub unit includes a hub wheel to which the wheel is attached and connected to the outer ring, and a bearing that rotatably supports the hub wheel.
The outer ring is centered on the axis and protrudes along the axis toward the hub wheel, and has a central convex portion having a predetermined length and diameter, and an outer side of a proximal end of the central convex portion and the axial line A plurality of outer protrusions disposed along the circumferential direction, each extending in the radial direction of the axis and projecting a predetermined length toward the hub wheel,
The hub wheel is open toward the outer ring, has a predetermined diameter centered on the axis, and a predetermined depth extending along the axis, and is fitted in a state where the central convex portion abuts on the bottom surface A central recess to be engaged, an outer side of the opening of the central recess, and a circumferential direction of the axis, each being open to the outer ring side, and extending in the radial direction of the axis and opposing parallel side walls And a plurality of outer recesses respectively fitted with the plurality of outer protrusions. The hub wheel is formed with a through hole having a predetermined diameter and extending around and along the axis.
The central convex portion of the outer ring is formed with a screw hole which is centered on the axis and extends along the axis.
The vehicle according to claim 1, wherein the hub wheel is fastened to the outer ring by inserting a bolt having substantially the same diameter as the through hole into the through hole and screwing the bolt hole into the screw hole. Wheel support equipment.

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