JP6070779B2 - Side face spline shape measurement method - Google Patents

Description

  The present invention relates to a shape measuring method for measuring the shape of a driven tooth (spline tooth) of a side face spline formed in a vehicle hub unit.

  A hub unit is used to rotatably support the wheels of an automobile with respect to a suspension device. In addition, as a hub unit, a side face spline having driven teeth (spline teeth) meshing with drive teeth formed on an outer ring of a constant velocity joint on an end surface on the inner side (vehicle inner side) of a hub wheel to which a drive wheel is mounted. (For example, see Patent Documents 1 and 2). In this hub unit, the rotational power of the drive shaft of the automobile is transmitted from the constant velocity joint to the hub wheel via the driven teeth.

Special Table 2008-5536737 JP 2008-174178 A

  Each driven tooth in the side face spline as described above is predetermined for various dimensions such as tooth surface dimensions, arrangement pitch, and coaxiality with respect to the rotation center in order to properly mesh with the drive teeth of the constant velocity joint. Accuracy is required. For this reason, after the hub unit is manufactured, an inspection process is performed in which various dimensions of the driven teeth are measured using a three-dimensional measuring device or the like and whether or not a predetermined accuracy is obtained.

  The driven teeth of the side face spline usually have a pitch surface in meshing with the drive teeth of the constant velocity joint as a reference surface (for example, a virtual surface indicated by a two-dot chain line α in FIG. 2; hereinafter also referred to as “design reference surface”) ) And the shape is designed. However, since this design reference surface is a virtual surface, the design reference surface cannot be used for measuring the shape of the driven tooth for the actual product in the inspection process. Therefore, in the past, various dimensions of spline teeth were measured by using the machined surfaces such as the hub wheel flange surface and wheel mating surface as a temporary reference surface. It was difficult to measure the dimensions stably.

  An object of the present invention is to provide a side face spline shape measuring method capable of easily measuring a predetermined item for the shape of a driven tooth.

The shape measurement method of the side face spline according to the present invention is formed on the axial end surface of the hub wheel of the vehicle hub unit and meshes with the drive teeth of the constant velocity joint by using a reference setting tool for shape measurement. A method for measuring the shape of a side face spline for measuring the shape of a driven tooth, wherein the reference setting tool is formed by arranging the reference teeth formed in an annular shape to imitate the shape of the drive teeth of the constant velocity joint And a first reference surface orthogonal to the arrangement center axis of the reference teeth, and the shape measuring method includes the step of meshing the reference teeth of the reference setting tool with the driven teeth of the hub wheel; The height from the flange of the hub wheel to the design reference surface of the driven tooth is a dimension obtained by adding the distance from the design reference surface of the reference tooth of the reference setting tool to the first reference surface. Obtaining a height dimension, measuring a change in height of the first reference plane when the hub wheel is rotated about an axis of the vehicle hub unit, and the height dimension. And a step of comparing a change in the height of the first reference surface.

In the present invention described above, the reference setting tool is used for measuring the shape of the driven tooth of the side face spline. This reference setting tool has a reference tooth imitating the shape of the drive tooth of the constant velocity joint, and a reference surface having a predetermined relationship with the reference tooth, that is, with respect to the reference central axis of the reference tooth. The first reference plane has an orthogonal relationship. Since the reference tooth is formed by imitating the shape of the drive tooth, the reference tooth has the same virtual design reference surface as the driven tooth in a state of being engaged with the driven tooth. The first reference surface having a predetermined relationship with the reference tooth naturally has a predetermined relationship with the design reference surface. Then, by measuring the height change of the first reference surface of the reference setting device which engaged in Hidoha, it is possible to easily measure the height variation of the Doha when rotating the Hidoha Become.

According to the present invention, it is possible to easily measure the height variation of the Doha by the measuring a first reference surface of the reference setting device which engaged the Hidoha.

It is sectional drawing which shows the hub unit for vehicles in embodiment of this invention. FIG. 2 is an enlarged cross-sectional view of a caulking portion of the vehicle hub unit shown in FIG. 1. FIG. 3 is a cross-sectional explanatory view of the vehicle hub unit showing how to set the measurement reference position of the driven tooth at the end of the caulking portion shown in FIG. It is a perspective view of a reference setting tool. It is a perspective view of a measuring device. It is sectional explanatory drawing of the hub unit for vehicles which shows the mode of the dimension measurement using a reference | standard setting tool. It is sectional explanatory drawing of the hub unit for vehicles which shows the mode of the dimension measurement using a reference | standard setting tool.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[Configuration of vehicle hub unit]
FIG. 1 is a cross-sectional view showing a vehicle hub unit according to an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of a caulking portion of the vehicle hub unit.
The vehicle hub unit 1 supports a vehicle wheel rotatably with respect to a suspension device, and includes a hub wheel 3 having a cylindrical hub shaft 2 and an end portion of the hub shaft 2 on the vehicle inner side ( An inner ring constituent member 4 that is caulked and fixed to the right end portion in FIG. A plurality of rolling elements 6 are provided between the hub shaft 2 and the inner ring raceways 2a and 4a on the outer peripheral surface of the inner ring constituting member 4 so as to be freely rollable. The plurality of rolling elements 6 are held at predetermined intervals in the circumferential direction by a cage 20. A seal member 21 is provided in the annular space formed between the outer ring 5 and the hub wheel 3 to seal the annular space from both axial ends.

  A flange portion 7 is formed at a vehicle outer side end portion (left end portion in FIG. 1) of the hub wheel 3, and a hole 7a into which a bolt (not shown) is fitted is formed in the flange portion 7, Tire wheels and brake discs are attached with bolts. A fixing flange 8 for attaching the hub unit 1 to a vehicle body side member (not shown) supported by a vehicle suspension is formed on the outer peripheral surface of the outer ring 5.

  The hub shaft 2 includes a large-diameter portion 9 formed on the flange portion 7 side, and a small-diameter portion that is smaller in diameter than the large-diameter portion 9 and is continuously formed via the large-diameter portion 9 and the stepped portion 10. 11 integrally. An inner ring raceway 2 a corresponding to the outer ring raceway 5 a of the outer ring 5 is formed on the outer peripheral surface of the large diameter portion 9.

  After the inner ring component 4 is fitted on the outer peripheral surface of the small diameter portion 11 of the hub shaft 2, the end portion of the small diameter portion 11 is caulked, whereby the stepped portion 10 and the small diameter portion 11 are caulked portions (caulking portions). 12 is fixed.

  The driving force of the drive shaft 31 is transmitted to the hub unit 1 through the constant velocity joint 30. The illustrated constant velocity joint 30 is a Barfield type constant velocity joint, and includes an inner ring 32 integrally connected to one end of a drive shaft 31, and an outer ring 33 disposed outside the inner ring 32. A plurality of balls 34 disposed between the inner ring 32 and the outer ring 33 and a cage 35 for holding the plurality of balls 34 are provided.

  The outer ring 33 of the constant velocity joint 30 includes a substantially bowl-shaped outer ring cylinder part 33a and an outer ring shaft part 33b protruding from the center of the end surface of the outer ring cylinder part 33a. The hole 36 is formed along the axial direction. An internal thread is formed on the inner peripheral surface of the hole 36. A male screw 37 of a cap bolt 38 is screwed into the female screw of the hole 36, and the hub unit 1 and the constant velocity joint 30 are connected by the cap bolt 38.

  As shown in FIG. 2, a side face spline 15 having a plurality of driven teeth (spline teeth) 13 is formed on the end surface of the caulking portion 12 at the axial end portion of the hub shaft 2 on the vehicle inner side. The plurality of driven teeth 13 are radially formed around the axis O in a state of being annularly arranged around the axis O (see FIG. 1) of the hub unit 1. A plurality of drive teeth 14 are formed on the end face of the outer ring cylinder portion 33a facing the caulking portion 12 in a radial pattern around the axis center of the outer ring 33 around the axis center. Yes. The rotational driving force of the drive shaft 31 is transmitted to the hub unit 1 through the constant velocity joint 30 due to the meshing of the driven teeth 13 and the drive teeth 14. In FIG. 2, the meshing portion 16 of the driven tooth 13 and the driving tooth 14 of the outer ring cylinder portion 33a is shaded. In FIG. 2, reference numerals 13 c and 13 b are attached to the tooth tip and the bottom of the driven tooth 13, and reference signs 14 c and 14 b are attached to the tooth tip and the tooth bottom of the driving tooth 14.

  The number of driven teeth 13 is, for example, 37, and the number of drive teeth 14 is the same as the number of driven teeth 13. A pitch surface (pitch line) α is set at the meshing position of the driven tooth 13 and the driving tooth 14. The driven teeth 13 and the drive teeth 14 are designed with the dimensions of the tooth surfaces, the tooth lines, and the like based on the pitch surface α, and are formed by die forging, for example.

After the manufacture, the hub unit 1 in which the side face spline 15 is formed is measured for various dimensions such as the tooth surface shape, tooth trace, and pitch of the driven tooth 13, and whether these dimensions satisfy a predetermined accuracy. An inspection process for inspecting for a failure is performed.
The driven tooth 13 of the side face spline 15 is designed to have a tooth surface shape and other dimensions with the pitch surface α (see FIG. 2) as a reference surface, and this reference surface α (hereinafter referred to as “design reference surface”). ) Is a virtual surface to the last, and the dimension measurement cannot be performed with reference to the design reference surface α in the inspection process. Therefore, in the present embodiment, a reference setting tool 50 described below is used to set an appropriate reference surface (measurement reference surface) that can be used as a substitute for the design reference surface α.

FIG. 3 is a cross-sectional explanatory view of the vehicle hub unit showing a state in which the measurement reference plane of the driven tooth shown in FIG. 2 is set. FIG. 4 is a perspective view of the reference setting tool 50.
The reference setting tool 50 is formed of an annular block, and a plurality of reference teeth 53 are formed on one end surface of the central axis β direction (the lower surface of the reference setting tool 50 in FIG. 3). The reference tooth 53 is formed by imitating the shape of the drive tooth 14 of the constant velocity joint 30 and is formed in the same shape as the drive tooth 14 and having a predetermined accuracy. Therefore, a virtual design reference surface α as shown in FIG. 2 is set also in the reference tooth 53, and the reference tooth 53 is formed with an accurate dimension based on the design reference surface α. The plurality of reference teeth 53 are arranged in an annular shape with a coaxial degree that satisfies a predetermined accuracy with respect to the central axis β. Further, a hole 55 is formed on the central axis β of the reference setting tool 50.

  The other end surface of the reference setting tool 50 in the direction of the central axis β (the upper surface of the reference setting tool 50 in FIG. 3) is formed as a flat surface. The other end surface is a surface orthogonal to the central axis β with a predetermined accuracy, and is formed parallel to the design reference surface α of the reference tooth 53 with a predetermined accuracy. The other end surface of the reference setting tool 50 constitutes a first reference surface 51 used for measuring the dimension of the driven tooth 13.

  Further, the outer peripheral surface 52 of the reference setting tool 50 is formed in a cylindrical surface centered on the central axis β. In addition, the outer peripheral surface 52 of the reference setting tool 50 is formed with a coaxiality and a roundness that satisfy a predetermined accuracy with respect to the central axis β. The outer peripheral surface 52 of the reference setting tool 50 constitutes a second reference surface used for measuring the dimension of the driven tooth 13.

  In order to measure the dimension of the driven tooth 13 of the side face spline 15 of the hub unit 1, the hub unit 1 is measured with a three-dimensional measuring machine (the present invention) in a state where the reference tooth 53 of the reference setting tool 50 is engaged with the driven tooth 13. Measuring part) 60. As shown in FIG. 5, the coordinate measuring machine 60 includes a surface plate 61, a portal frame 62 provided so as to be movable in the front-rear direction (Y direction) of the surface plate 61, and the portal frame 62. A slider 64 provided so as to be movable in the left-right direction (X direction) along the horizontal beam 63, a lifting shaft 65 provided on the slider 64 so as to be movable up and down in the vertical direction (Z direction), and the lifting shaft 65. And a probe 67 attached to the lower end of the wire through a holder 66. A spherical measuring element 68 is provided at the tip of the probe 67.

  Then, the coordinate measuring machine 60 moves the probe 67 in the three-dimensional direction (XYZ direction), sequentially contacts the measuring element 68 to the measurement site of the workpiece W, and measures the coordinate value at the contact point. Various dimensions of the workpiece W can be obtained by calculating the coordinate values. In addition, as this coordinate measuring machine 60, the conventionally well-known thing can be used.

  In the present embodiment, as shown in FIG. 3, the hub unit 1 on which the reference setting tool 50 is mounted is set on the surface plate 61 as the work W. Then, the probe 68 of the probe 67 is brought into contact with the first reference surface 51 and the second reference surface 52 of the reference setting tool 50, and the coordinates of the first reference surface 51 and the second reference surface 52 are measured. . Then, the first reference surface 51 and the second reference surface 52 are set to measurement reference surfaces (measurement reference positions) A and B for measuring the dimension of the driven tooth 13, respectively.

  Next, the reference setting tool 50 is removed from the hub unit 1 on the surface plate 61, the probe 68 of the probe 67 is brought into contact with the driven tooth 13 of the side face spline 15, and the tooth surface and teeth of the driven tooth 13 are detected. Measure various dimensions such as streaks and pitches. At this time, the coordinates of the contact point of the probe 68 with respect to the driven tooth 13 are coordinates based on the measurement reference surfaces A and B set by the first reference surface 51 and the second reference surface 52.

  The first reference surface 51 of the reference setting tool 50 is formed in parallel with the design reference surface α (see FIG. 2) of the reference tooth 53 with a predetermined interval. Therefore, by engaging the reference tooth 53 of the reference setting tool 50 with the driven tooth 13 of the hub unit 1, the design reference surface α of the driven tooth 13 is replaced with the first reference surface 51 moved as it is in the Z direction by a predetermined interval. Is possible. Accordingly, the first reference surface 51 is used as the measurement reference surface A, and the shape of the driven tooth 13 is measured with reference to the measurement reference surface A, so that more accurate measurement is possible. It is possible to accurately inspect whether or not

  Further, by using the second reference surface 52 as the measurement reference surface B, the position (coordinates) of the central axis β (see FIG. 4) of the reference tooth 53 can be obtained. Since the center axis β corresponds to the designed center axis of the driven tooth 13 by meshing the reference tooth 53 with the driven tooth 13, the dimension of each driven tooth 13 with respect to the center axis β is measured. Thus, the coaxiality of each driven tooth 13 with respect to the virtual center axis can be accurately obtained.

The above measurement is performed on all the driven teeth 13 of the side face spline 15, and is a detailed measurement performed over a certain period of time. Therefore, it can be suitably implemented as a sampling inspection that is performed not on all products but on a part of products of the same model number.
And 100% inspection performed on all products can be easily performed using the reference setting tool 50 by the measurement method described below.

  6 and 7 are cross-sectional explanatory views of the vehicle hub unit showing a measurement method using a reference setting tool as a measurement target. The measurement method shown in FIGS. 6 and 7 does not directly measure the dimension of each driven tooth 13 as in the above-described measurement method, but the reference setting tool 50 itself meshed with the driven tooth 13. It is intended for measurement.

  In order to assemble the side face spline 15 of the hub unit 1 with the drive teeth 14 of the constant velocity joint 30 with high accuracy, several guarantee items are set. As the guarantee item, for example, the amount of deflection in the direction of the axis O of the driven tooth 13 with respect to the outer ring 5 when the hub wheel 3 is rotated, and the coaxiality of the driven tooth 13 with respect to the axis O of the hub wheel 3 (radial direction) ), And the height of the driven tooth 13 with respect to the flange 7 surface of the hub wheel 3. And in order to test | inspect about these guarantee items, the measuring method shown by FIG.6 and FIG.7 can be implemented.

  First, as shown in FIG. 6, the reference setting tool 50 is fixed to the hub unit 1 in a state where the reference setting tool 50 is engaged with the side face spline 15 of the hub unit 1. In the present embodiment, the hub wheel 3 and the reference setting tool 50 are sandwiched between a pair of clamping plates 70 and 71 connected by bolts 72. Then, the outer ring 5 of the hub unit 1 is fixed to the fixing member 74.

  Then, the hub wheel 3 is rotated once around the axis O while the measuring instruments 75 and 76 such as dial gauges are in contact with the first reference surface 51 and the second reference surface 52 of the reference setting tool 50. Let As a result, the reference setting tool 50 also rotates once following the hub wheel 3, and the amount of deflection of the first reference surface 51 and the second reference surface 52 can be measured by the measuring instruments 75 and 76. The shake amount of the first reference surface 51 corresponds to the shake amount of the driven tooth 13 in the axis O direction with respect to the outer ring 5 (the shake amount of the reference surface α). Further, the amount of deflection of the second reference surface 52 corresponds to the amount of deflection (coaxiality) in the radial direction with respect to the rotation center (axis O) of the hub wheel 3.

  Further, as shown in FIG. 7, the flange 7 of the hub wheel 3 of the hub unit 1 to which the reference setting tool 50 is fixed is placed on the rotation base 77. Then, the height of the reference setting tool 50 (the distance from the design reference surface α of the reference tooth 53 to the first reference surface 51) is added to the height from the flange 7 to the design reference surface α of the driven tooth 13. A block gauge 78 is matched to the dimensions and placed on the rotating base 77. Then, the change in the height of the first reference surface 51 of the reference setting tool 50 when the rotation base 77 is rotated once around the axis O by a measuring instrument 79 such as a dial gauge is compared with the height of the block gauge 78. Then, the runout of the design reference surface α of the driven tooth 13 replaced with the first reference surface 51 is measured.

  Therefore, in the measurement method shown in FIG. 6 and FIG. 7, it is possible to specify a specific value by measuring the first reference surface 51 and the second reference surface 52 of the reference setting tool 50 without directly measuring the driven tooth 13. Inspections can be performed on guaranteed items.

The present invention is not limited to the above-described embodiment, and can be appropriately changed within the scope of the invention described in the claims.
For example, the reference setting tool 50 of the above embodiment includes the two reference surfaces, the first reference surface 51 and the second reference surface 52, but only one of them may be provided. The reference surface may be a reference surface other than the first and second reference surfaces 51 and 52 described above as long as it has a predetermined relationship with the reference tooth 53.

  1: vehicle hub unit, 3: hub wheel, 12: caulking part, 13: driven tooth, 14: driving tooth, 15: side face spline, 30: constant velocity joint, 50: reference setting tool, 51: first reference Surface, 52: second reference surface, 53: reference tooth, 60: three-dimensional measuring machine (measuring unit), 75: measuring instrument, 76: measuring instrument, 79: measuring instrument

Claims (1)

A side face spline that measures the shape of the driven tooth that is formed on the axial end face of the hub wheel of the vehicle hub unit and meshes with the drive teeth of the constant velocity joint by using the reference setting tool for shape measurement. The shape measuring method of
The reference setting tool is:
Reference teeth formed in an annular shape to simulate the shape of the drive teeth of the constant velocity joint,
A first reference surface perpendicular to the array center axis of the reference teeth,
The shape measuring method is:
Meshing the reference teeth of the reference setting tool with the driven teeth of the hub wheel;
The height from the flange of the hub wheel to the design reference surface of the driven tooth is a dimension obtained by adding the distance from the design reference surface of the reference tooth of the reference setting tool to the first reference surface. A process for obtaining a height dimension;
Measuring a change in height of the first reference surface when the hub wheel is rotated about the axis of the vehicle hub unit;
Comparing the height dimension with a change in height of the first reference surface;
The shape measuring method of the side face spline characterized by including these.