JPH0943108A - Jig for measuring surface runout of brake rotor - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To improve the accuracy of surface runout measurement of a brake rotor by creating a situation that is similar to the situation where the brake rotor is mounted on a vehicle body. A cylinder part (12) is rotatably and coaxially arranged below a knuckle shaft (45) held vertically.
The brake rotor 48 and the wheel hub between the bearing support cylinder 13 fixed to the cylinder portion 12 and capable of contacting the bearing 46 of the knuckle shaft 45 and the bearing support cylinder 13 by the pulling / pushing operation of the cylinder portion 12. 47 and bearing 46
The rotary cylinder 10 provided with the rod 14 having the large diameter portion 14a for holding and releasing the wheel, the motor shaft 6a of the motor 6 for rotating the brake rotor 48, the rotation transmission / cylinder suspension mechanism 20 provided, and the cylinder portion 12 and the rod. A rod steady rest mechanism 30A is provided between the cylinder portion 12 and the bearing support cylinder 13, and a cylindrical steady rest mechanism 30B is provided between the cylinder portion 12 and the bearing support cylinder 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for measuring surface wobbling of a brake rotor used for measuring the surface wobbling of a brake rotor used in a disc brake.

[0002]

2. Description of the Related Art The above-mentioned brake rotor, when measuring its surface deflection, is temporarily mounted on a hollow short shaft, for example, a knuckle shaft, which is mounted on the same vehicle body as this brake rotor, and is set on a jig. Conventionally, for example, a jig for measuring surface wobbling of a brake rotor used when measuring surface wobbling is shown in FIG.

A jig 51 for measuring surface wobbling of a brake rotor shown in FIG. 4 includes a base plate 52 and a clamp receiver 5 above a through hole 52a formed in the base plate 52.
A clamp 54 that is provided through the base plate 52 to hold the knuckle shaft (hollow short shaft) K in the vertical direction, and a core 5 that is provided below the base plate 52 and is inserted into the through hole 52a.
Brake rotor B together with cylinder 56 that pushes and pulls 5 to hold and release knuckle shaft K by clamp 54, and wheel hub W that is arranged coaxially with knuckle shaft K and fitted into bearing A of knuckle shaft K. Is equipped with a motor 57 for rotating, and the output of the motor 57 is transmitted via a weight 58 which is placed on the brake rotor B and presses the brake rotor B against the wheel hub W.

In the jig 51 for measuring the surface runout of the brake rotor, the knuckle shaft K is held vertically on the clamp 54 by pushing the cylinder 56 to expand the clamp 54. After making the brake rotor B rotatable with respect to K via the wheel hub W, a weight 58, which rotates with play in the axial direction by the motor 57, is placed on the brake rotor B, and the brake rotor B is rotated by the wheel 58. The hub W is rotated while being pressed, and the surface runout of the brake rotor B generated in this state is measured by a detector 60 such as a dial gauge.

Regarding the above-mentioned conventional jig 51 for measuring the surface runout of the brake rotor, for example, 4
There is a little description on pages 94 to 96 of the Automotive Engineering Complete Volume 19 Car Manufacturing Method published by Sankaido Co., Ltd. on March 20.

[0006]

However, in the above-mentioned conventional jig 51 for measuring the surface deflection of the brake rotor, the brake rotor B, which is actually firmly fixed to the wheel hub W, uses the weight 58 to rotate the wheel. It is only pressed against the hub W, and in addition, the bearing A
Also, since almost no axial load is applied to the brake rotor B, the surface runout of the brake rotor B obtained by using the surface runout measuring jig 51 is attached to the vehicle body. There is a possibility that it may not match the surface wobbling at the time of running, and this may cause an error in the evaluation of the surface wobbling of the brake rotor B, and this problem is solved by the conventional method. It was a challenge.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and makes it possible to create a situation similar to the situation in which the brake rotor is mounted on the vehicle body and to accurately measure the surface deflection. It is an object of the present invention to provide a jig for measuring surface wobbling.

[0008]

According to a first aspect of the present invention, a bearing is coaxially mounted in a hollow portion and is coaxially arranged with a hollow short shaft having a hollow shaft extending in a vertical direction. In a jig for surface deflection measurement of a brake rotor including a motor that rotates a brake rotor together with a wheel hub fitted to, a cylinder portion coaxially arranged below the hollow minor shaft and rotatably supported, A bearing supporting cylinder provided on the cylinder side of the cylinder portion and capable of contacting the lower end of the bearing, and a piston which penetrates the bearing supporting cylinder and the hollow portion of the wheel hub and is connected to the piston side of the cylinder portion. Of the brake rotor, the wheel hub, and a rod having a pressing portion that holds and releases the brake rotor, the wheel hub, and the bearing from the bearing supporting cylinder by pulling and pushing And a cylinder transmission mechanism for transmitting the rotation of the motor to the brake rotor with play and suspending the rotation cylinder on the motor shaft of the motor by rod pulling operation of the piston of the rotation cylinder. A rod steady mechanism is provided between the cylinder part of the cylinder and the rod.
A cylindrical steady rest mechanism is provided between the cylinder portion of the rotary cylinder and the bearing support cylinder, and the construction of such a jig for surface runout measurement of the brake rotor is described above. It is used as a means to solve the problem.

Further, in a jig for measuring surface runout of a brake rotor according to a second aspect of the present invention, the rod runout preventing mechanism is provided with an outward flange on the rod, and the rod is attached to a joint fixed to a piston of a cylinder portion. The inward flange facing the outward flange is provided above the outward flange in the above, and the thrust bearing is interposed between the both flanges, and the surface runout of the brake rotor according to claim 3 of the present invention. In the jig for measurement, the cylindrical steady rest has a bearing support cylinder provided with an outward flange, and a guide ring fixed to the cylinder portion is positioned below the outward flange of the bearing support cylinder to form an outward flange. The inward facing flanges are provided, and the thrust bearing is interposed between the flanges.

Further, in the jig for measuring surface runout of a brake rotor according to a fourth aspect of the present invention, the rotation transmission / cylinder suspension mechanism is connected to the motor shaft with an opening downward so that only rotation is transmitted. A case, a rotor pressurizing body fitted inside the case, slidable in the axial direction, and prevented from slipping out of the case, and an upward facing surface provided above the rotor pressurizing body. , A pair of followers that come into contact with and separate from the cam surfaces of the rod to lock and release the pressing portion of the rod. The rotor pressing body is urged downward and the rotor pressing ring and the hub are provided. A presser ring is provided.

Furthermore, a jig for measuring surface wobbling of a brake rotor according to a fifth aspect of the present invention is provided with a centering mechanism for a wheel hub. In this case, the brake according to the sixth aspect of the present invention. In the rotor run-out measurement jig, the centering mechanism of the wheel hub is a lower taper cone that presses the hollow lower surface chamfer of the wheel hub that is fitted to the hollow short shaft bearing provided on the rod of the rotating cylinder. ,
The rotor pressurizing body of the rotation transmission / cylinder suspension mechanism is provided with an upper taper cone for pressing the hollow upper surface chamfer of the wheel hub.

[0012]

In the jig for measuring the surface runout of the brake rotor according to claim 1 of the present invention, first, the hollow minor shaft is held in the vertical direction, and the wheel on which the brake rotor is mounted is held on this hollow minor shaft. The hub is set in a rotatable state via the bearing.

Next, after connecting the motor shaft of the motor to the brake rotor by the rotation transmission and cylinder suspension mechanism,
When the cylinder part of the rotary cylinder is operated to pull the rod, the brake rotor, the wheel hub and the bearing are held between the pressing part of the rod and the bearing support cylinder that abuts the bearing mounted on the hollow short shaft. Will be done. In other words, the brake rotor is firmly fixed to the wheel hub, and the same axial load is applied to the bearings, creating a situation similar to the situation where the brake rotor is mounted on the vehicle body. Becomes

At this time, the rotary cylinder is suspended by the rotation transmission / cylinder suspension mechanism by the pulling operation of the rod, and only the rotation is transmitted from the motor shaft to the brake rotor with an axial play, while the rod and the bearing are engaged. Since the cylinder part that supports the support cylinder is rotatable, the brake rotor rotates with almost no contact resistance that cancels surface runout, and in addition, extra runout is applied to the rotary cylinder. Even if it occurs, the rod steady-state mechanism and the cylinder steady-state mechanism absorb this swing, so the rod and the bearing support cylinder rotate without swinging, and in the end, it is similar to the situation where the brake rotor is mounted on the vehicle body. In such a situation, accurate surface wobbling will be measured.

In the jig for measuring the surface runout of the brake rotor according to the second aspect of the present invention, as described above, when the rotary cylinder rotates together with the brake rotor, when excessive runout occurs in the rotary cylinder, rod runout occurs. Since the thrust bearing interposed between the outward flange of the rod and the inward flange of the joint in the stop mechanism absorbs this vibration, the rod rotates without vibration, and the brake rotor according to claim 3 of the present invention. In the surface runout measurement jig, when excessive runout occurs in the rotary cylinder, the thrust bearing interposed between the outward flange of the bearing support cylinder and the inward flange of the guide ring in the cylindrical steady rest is Since the runout is absorbed, the bearing support cylinder rotates without swinging.

In the jig for surface runout measurement of a brake rotor according to a fourth aspect of the present invention, when the rotation transmission / cylinder suspension mechanism is lowered, the rotor pressing ring of the rotor pressing body contacts the brake rotor, and the rotor is pressed. The pressurizing body rises with respect to the case.

As the rotor pressurizing body rises, a pair of followers abutting against the upward cam surfaces approach each other, and in this state, the cylinder portion of the rotary cylinder is operated to pull the rod. , The pair of followers are hooked on the pressing portion of the rod, and the brake rotor, the wheel hub, and the bearing are formed by the pressing portion of the rod and the bearing supporting cylinder through the pair of followers, the rotor pressing body and the hub retaining ring. Will be held.

At this time, since the brake rotor is pressed by the rotor pressing ring which is urged downwardly, the measurement surface is prevented from being distorted, and in addition, the portion close to the axis of the wheel hub is prevented. Since it is pressed by the hub pressing ring which is biased downward, there is almost no rattling in the bearing.

In the jig for measuring the surface runout of the brake rotor according to the fifth aspect of the present invention, the center of the wheel hub is centered instead of the center of the hollow short shaft. Therefore, in the jig for measuring the surface runout of the brake rotor according to claim 6 of the present invention, the lower taper cone of the rod and the upper taper cone of the rotor pressurizing body are respectively hollow in the wheel hub. When the lower side chamfer and the hollow upper chamfer are brought into pressure contact with each other, the measurement is performed in a state where the center of the wheel hub and the center of the jig coincide with each other, and the measurement accuracy is further improved.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

1 to 3 show an embodiment of a jig for measuring surface wobbling of a brake rotor according to the present invention.

The jig 1 for measuring the surface runout of the brake rotor shown in the figure comprises a base plate 2, and a through hole 2a formed in this base plate 2 has an opening step portion 45a of a knuckle shaft 45 as a hollow short shaft. The knuckle shaft support cylinder 3 which is fitted in and held in the vertical direction is fitted and fixed.

A rotary cylinder 10 is provided below the base plate 2. The rotary cylinder 10 is fixed to a fixed portion 11 supported by a frame 4 which is raised and lowered by pushing and pulling a rod 5 by a cylinder (not shown).
A cylinder portion 12, a bearing support cylinder 13 provided at an upper end of the cylinder portion 12 and slidably penetrating the knuckle shaft support cylinder 3, and an operation of the cylinder portion 12 penetrating the bearing support cylinder 13 and A sliding rod 14 is provided.

More specifically, as shown in FIG.
The fixed portion 11 has, on the outer periphery, each connection port 11 for an oil supply pipe and an oil discharge pipe
In addition to having a and 11b, a valve support hole 11c that communicates with these connection ports 11a and 11b is provided at the center, and a connecting plate 11d (not shown in FIG. 3) provided at the lower end is placed above and below the frame 4. Direction with a play, and the projections 11e provided on the connecting plate 11d,
By locking 11e in the recesses 4a, 4a on the frame 4 side with a margin, the fixed portion 11 is supported with play in the axial direction and the rotational direction with respect to the frame 4.

The cylinder portion 12 is a cylinder body 12a.
And a piston 12b connected to the rod 14, and by fitting a rotary valve 12c provided at the center of the lower end of the cylinder body 12a into a valve support hole 11c of the fixed portion 11 via a bearing 11f, The fixed portion 11 is rotatably supported. By fitting the rotary valve 12c and the valve support hole 11c, the inside of the cylinder body 12a and the connection port 11a of the fixed portion 11 are
It is possible to connect and disconnect with 11b.
The cylinder portion 12 can rotate while the piston 12b is operating.

In this case, a rod steadying mechanism 30A is provided between the cylinder portion 12 of the rotary cylinder 10 and the rod 14.
Is provided, and the cylinder portion 12 and the bearing supporting cylinder 1 are provided.
A cylindrical steady rest mechanism 30 </ b> B is provided between the same and the unit 3. In the rod steadying mechanism 30A, a stopper bolt (outward flange) 31 is provided at the lower end of the rod 14, and a joint 32 fixed to the piston 12b of the cylinder portion 12 is provided.
An inward flange 33 is provided above the stopper bolt 31 and faces the stopper bolt 31, and a thrust bearing 34 is interposed between the stopper bolt 31 and the inward flange 33. On the other hand, a cylindrical steady rest mechanism is provided. 30B is
The guide ring 36 fixed to the cylinder portion 12 is provided with an outward flange 35 at the lower end portion of the bearing support cylinder 13.
Is provided below the outward flange 35 and faces the inward flange 37, and a thrust bearing 38 is interposed between the flanges 35 and 37.

The upper end of the bearing supporting cylinder 13 that is rotated by the cylinder portion 12 and is supported by the guide cap 39 fixed to the cylinder portion 12 has the above-mentioned frame 4
When it is raised, it comes into contact with the lower end of the inner ring 46a of the bearing 46 mounted inside the knuckle shaft 45.

Further, the jig 1 for measuring the surface runout of the brake rotor is provided with a motor 6 having a motor shaft 6a arranged coaxially with the rod 14 above the knuckle shaft support cylinder 3, and the rotation of the motor shaft 6a. Is transmitted to the brake rotor 48 on the wheel hub 47 fitted to the bearing 46 of the knuckle shaft 45 via the rotation transmission / cylinder suspension mechanism 20.

The rotation transmission / cylinder suspension mechanism 20 is
A substantially cup-shaped case 21 in which only the rotation is transmitted by connecting the motor shaft 6a with play with the opening facing downward.
A rotor pressurizing body 23 fitted inside the case 21 so as to be slidable in the axial direction and prevented from slipping off by a stopper 22 provided at an opening of the case 21, and an upper portion of the rotor pressurizing body 23. Of the pair of followers 24, 24 respectively abutting on the upward cam surfaces 23a, 23a provided facing each other.
Is provided. A rotor retainer ring 27 and a hub retainer ring 28 are provided on the lower surface of the rotor pressurizer 23, and the rotor retainer ring 27 and the hub retainer ring 28 are both compression springs 29 provided on the rotor retainer 23. , 29 are urged downward by the repulsive force applied from the rotor pressurizing body 23 to the brake rotor 4
If it is pressed against 8, the brake rotor 4
8 and the portions of the wheel hub 47 near the respective axes are pressed.

Jig 1 for measuring the surface runout of this brake rotor
As described above, the rotor pressing body 23 is connected to the brake rotor 4
8 is provided with a centering mechanism 40 for simultaneously centering the wheel hub 47. The centering mechanism 40 is used for the rod 1 in the rotary cylinder 10.
4 is urged upward by a repulsive force applied from a compression spring 41 that is also provided in the middle portion of the wheel 14 and is fitted to the rod 14, and the hollow portion lower side chamfer 4 of the hollow portion of the wheel hub 47.
The lower taper cone 42 that presses 7a and the rotor pressurizing body 23 of the rotation transmission / cylinder suspension mechanism 20 are provided at the center of the hollow portion of the wheel hub 47.
And an upper taper cone 43 for pressing.

The pair of followers 24, 24 is the case 2
Blocks 25 and 25 provided on the inner surface of the rotor 1 and the rotor pressure body 2
When the rotor pressurizing body 23 rises relative to the case 21, the rotor pressurizing body 23 moves closer to each other and the rotor pressurizing body 23 moves relative to the case 21. If it descends, block 25,
25, they are separated from each other by the repulsive force applied from the compression springs 26, 26 respectively provided in 25. Then, the pair of followers 24, 24 are provided with claw portions 24a,
24a is provided and when the rotor pressurizing body 23 is raised, that is, when the rotor pressing ring 27 of the rotor pressurizing body 23 is pressed against the brake rotor 48 as shown in FIG. Approaching claws 24a, 2
The tip end side of the rod 14 penetrating the rotor pressing body 23 from below is sandwiched by 4a with a small gripping force.

In this case, a large diameter portion 14a as a pressing portion is provided at the tip of the rod 14, and the rod 14 sandwiched between the pawl portions 24a, 24a of the pair of followers 24, 24 as described above is illustrated. As shown in FIG. 1, by moving the cylinder portion 12 downward by the rod pulling operation, the claw portion 24
The large diameter portion 14a of the rod 14 is hooked by a and 24a so that the entire rotary cylinder 10 can be suspended.

That is, the followers 24, 24, the rotor pressing body 23, the rotor pressing ring 27, and the hub pressing ring 28.
Through the large diameter portion 14a of the rod 14 and the bearing support cylinder 13
The brake rotor 48, the wheel hub 47, and the inner ring 46a of the bearing 46, and the centering mechanism 40 firmly fixes the brake rotor 48 to the wheel hub 47 whose center coincides with the jig center. An axial load that can actually be applied to the bearing 46 can be applied. In this state, the brake rotor 48 is rotated by the output of the motor 6, and the brake rotor 4 generated at this time is rotated.
The surface runout of No. 8 is measured by the detector 49.

A procedure for setting the brake rotor 48 on the jig 1 for measuring the surface runout of the brake rotor will be described.

First, as shown in FIG. 2, after the opening step portion 45a of the knuckle shaft 45 is placed on the upper end of the knuckle shaft supporting cylinder 3 and held in the vertical direction, the wheel hub 47 on which the brake rotor 48 is placed is mounted. The knuckle shaft 45 is fitted into the bearing 46 so that the knuckle shaft 45 is rotatable in a horizontal direction.

Next, when the rod 4 of the rotating cylinder 10 is raised by pushing up the rod 5 by a cylinder located below the drawing, the lower taper cone 42 of the centering mechanism 40 is moved by the wheel hub 47.
Of the wheel hub 47.
The center of the jig 1 and the center of the jig 1 are substantially aligned with each other, and subsequently, the bearing support cylinder 13 moves the inner ring 46 a of the bearing 46.
Abut.

Next, as shown in FIG. 1, when the rotation transmission / cylinder suspension mechanism 20 as a whole is lowered together with the motor 6 so that the rotor pressing ring 27 of the rotor pressurizing body 23 is pressed against the brake rotor 48. Pressurized body 23
As the cam surface rises with respect to the case 21, the cam surface 23
Since the pair of followers 24, 24 abutting on the a, 23a approach each other, the claw portions 24a, 24 of the followers 24, 24 respectively.
Due to a, the tip end side of the rod 14 is pinched with a small gripping force.

During this time, the upper taper cone 43 provided at the center of the rotor pressing body 23 presses the hollow upper side chamfered portion 47b of the wheel hub 47, so that the lower taper cone 42 is hollowed out of the wheel hub 47. The center of the wheel hub 47 and the center of the jig 1 are in complete agreement with each other in combination with pressing.

Subsequently, the cylinder portion 1 of the rotary cylinder 10
When pulling 2 to move the rod 14 downward,
The large diameter portion 14a of the rod 14 is the pawl portion 2 of the follower 24, 24.
4a and 24a, the entire rotary cylinder 10 is suspended by the rotation transmission / cylinder suspension mechanism 20 side. Further, when the cylinder portion 12 is caused to pull the rod 14, the rotary cylinder 10 is raised. Since the upper end of the bearing support cylinder 13 is pressed against the inner ring 46a of the bearing 46, the brake rotor 48, the wheel hub 47, and the inner ring 46a of the bearing 46 are driven by the followers 24, 24, the roller pressing body 23, and the rotor pressing ring 27. And hub retainer ring 28
Through the large diameter portion 14a of the rod 14 and the bearing support cylinder 1
It will be held between 3 and.

At this time, since the brake rotor 48 is pressed by the rotor pressing ring 27 that is urged downward, the measurement surface is prevented from being distorted, and in addition, the shaft of the wheel hub 47 is prevented. Since the near portion is pressed by the hub pressing ring 28 urged downward,
There is almost no rattling in the bearing 46.

That is, the brake rotor 48 and the wheel hub 47 are firmly fixed, and an axial load is applied to the bearing 46 having no rattling, which is similar to that when the brake rotor 48 is mounted on the vehicle body. The situation will be obtained.

Then, the motor 6 is lowered to establish a state in which the motor 6 is connected with play so as to transmit only rotation to the rotation transmission / cylinder suspension mechanism 20, and then the motor 6 is operated to rotate the rotation transmission / cylinder suspension mechanism 20. The brake rotor 48 is rotated together with the wheel hub 47 via.

At this time, the brake rotor 48 and the wheel hub 47 are integrally suspended with the rotary cylinder 10 so as to be suspended from the rotation transmission / cylinder suspension mechanism 20, and only the rotation is transmitted from the motor 6 to the brake rotor 48 with play. Since the cylinder part 12 is rotatable,
The bearing 46 is no longer loaded in the radial direction,
The brake rotor 48 will rotate stably with almost no contact resistance that cancels the surface runout.

In addition, in the jig 1 for measuring the surface runout of the brake rotor, even if the rotary cylinder 10 has extra runout, the thrust between the stopper bolt 31 and the inward flange 33 in the rod steadying mechanism 30A is increased. Bearing 3
4 and the thrust bearing 38 between the outward flange 35 and the inward flange 37 of the cylindrical steady rest mechanism 30B.
Absorbs this vibration, the rod 14 and the bearing support cylinder 13 rotate without vibration, and if the surface vibration is measured by the detector 49 in this state, it is approximate to the situation where the brake rotor 48 is mounted on the vehicle body. In such a situation, accurate surface wobbling will be measured.

Further, in the jig 1 for measuring the surface runout of the brake rotor, not the centering of the knuckle shaft 45 but the center of the wheel hub 47 and the center of the jig 1 are perfectly aligned with each other. Since the portion of the hub 47 near the axis is pressed by the hub pressing ring 28 that is urged downward, rattling of the bearing 46 is almost eliminated, and the measurement accuracy is further improved.

When the measurement is completed, first, the cylinder portion 12 of the rotary cylinder 10 is pushed to move the rod 14 upward so that the rotary cylinder 10 is lowered onto the frame 4 so that the rod 14 has a large diameter. Brake rotor 48 and wheel hub 4 by the portion 14a and the bearing support cylinder 13
7 and the inner ring 46a of the bearing 46 are released, the motor 6 is raised to separate the rotor pressure body 23 of the rotation transmission / cylinder suspension mechanism 20 from the brake rotor 48. As the claw portions 24a, 24a are separated from each other as they descend with respect to the case 21, the rod 14 transmits the rotation and also serves as the cylinder suspension mechanism 2.
It will be separated from 0.

After that, the frame 4 is lowered to remove the knuckle shaft 45 from the knuckle shaft supporting cylinder 3.

The detailed structure of the jig for measuring surface wobbling of the brake rotor according to the present invention is not limited to the above embodiment.

[0049]

As described above, in the jig for measuring the surface runout of the brake rotor according to claim 1 of the present invention,
With the above-described configuration, the brake rotor can be firmly fixed to the wheel hub and an axial load can be applied to the bearing, which is similar to the situation where the brake rotor is actually mounted on the vehicle body. In addition to being able to create situations, in addition to being able to rotate the brake rotor with almost no contact resistance, the rod steady mechanism and cylindrical steady mechanism can be used even if extra runout occurs in the rotating cylinder. Since this deflection can be absorbed and the rod and bearing support cylinder can be rotated without deflection, in the end, the situation is similar to the situation where the brake rotor is mounted on the vehicle body, so accurate surface deflection measurement is possible. The extremely good effect of being possible is brought about.

Further, in the jig for measuring the surface runout of the brake rotor according to the second aspect of the present invention, as described above, when the rotary cylinder is rotated with the brake rotor, excessive runout is generated in the rotary cylinder. Since the thrust bearing interposed between both flanges in the rod steadying mechanism absorbs this runout, it is possible to rotate the rod without running out. In the jig, if excessive runout occurs in the rotary cylinder, as in the above case, the thrust bearing located between both flanges in the cylinder steady rest mechanism absorbs this runout, so it is possible to rotate the bearing support cylinder without running out. The remarkable effect that can be achieved is brought about.

Further, since the jig for measuring surface wobbling of the brake rotor according to claim 4 of the present invention has the above-mentioned structure, the rotation transmission / cylinder suspension mechanism is lowered and the rod portion is pulled to the cylinder portion of the rotary cylinder. By performing the operation, the brake rotor, the wheel hub and the bearing can be held by the pressing portion of the rod and the bearing supporting cylinder, and at this time, the brake rotor is pressed by the rotor pressing ring biased downward. Therefore, it is possible to prevent the occurrence of distortion on the measurement surface, and to press the part near the axis of the wheel hub with the hub pressing ring that is biased downward, so there is almost no rattling in the bearing. It is possible to obtain a remarkably excellent effect.

Furthermore, with the jig for measuring surface deflection of the brake rotor according to the fifth aspect of the present invention, the center of the wheel hub can be centered instead of the center of the wheel hub. It is possible to perform the measurement in a state in which the center of the jig and the center of the jig are aligned with each other.
In the jig for surface runout measurement of the brake rotor according to the above, if the lower taper cone of the rod and the upper taper cone of the rotor pressurizing body are respectively brought into pressure contact with the hollow lower surface chamfer and the hollow upper surface chamfer of the wheel hub respectively, It is possible to perform the measurement in a state where the center of the wheel hub and the center of the jig are aligned with each other, and therefore, the remarkably excellent effect that the measurement accuracy can be further improved is brought about.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing an embodiment of a jig for surface deflection measurement of a brake rotor according to the present invention in a state where a brake rotor is completely set.

FIG. 2 is a cross-sectional explanatory view of a state before the brake rotor is set in the jig for surface deflection measurement of the brake rotor shown in FIG.

FIG. 3 is an enlarged cross-sectional explanatory view of a main part of a rotary cylinder in the jig for surface deflection measurement of the brake rotor shown in FIG.

FIG. 4 is an explanatory cross-sectional view showing a conventional jig for measuring surface wobbling of a brake rotor.

[Explanation of symbols]

 1 Brake Rotor Surface Runout Jig 6 Motor 6a Motor Shaft 10 Rotating Cylinder 12 Cylinder Part 13 Bearing Support Cylinder 14 Rod 14a Large Diameter Part (Pressing Part) 20 Rotation Transmission and Cylinder Suspension Mechanism 30A Rod Stead Rest Mechanism 30B Cylindrical Runout Stopping mechanism 40 Centering mechanism 45 Knuckle shaft (hollow short shaft) 46 Bearing 47 Wheel hub 48 Brake rotor

Claims (6)

[Claims] 1. A motor having a bearing coaxially mounted in a hollow portion and coaxially arranged with a hollow short shaft having a hollow shaft extending in a vertical direction and rotating a brake rotor together with a wheel hub fitted to the bearing. In the jig for measuring the surface runout of the brake rotor, a cylinder portion coaxially arranged below the hollow short shaft and rotatably supported, and a jig provided on the cylinder side of the cylinder portion and contacting the lower end of the bearing are provided. Between the bearing supporting cylinder which is capable of contacting and the bearing supporting cylinder and the hollow portion of the wheel hub, and which is connected to the piston side of the cylinder portion, and the bearing supporting cylinder by pulling / pushing operation of the piston. The brake rotor, the wheel hub, and the rotary cylinder having a rod having a pressing portion for holding and releasing the bearing are provided, and the brake rotor has a motor A rotation transmission / cylinder suspension mechanism that transmits rotation with play and suspends the rotation cylinder by the rod pulling operation of the piston of the rotation cylinder is provided between the cylinder portion and the rod of the rotation cylinder. A jig for surface runout measurement of a brake rotor, wherein a rod steadying mechanism is provided and a cylindrical steadying mechanism is provided between the cylinder portion of the rotary cylinder and the bearing supporting cylinder. 2. The rod steadying mechanism is provided with an outward flange on the rod, and a joint fixed to a piston of a cylinder portion is located above the outward flange of the rod and faces the outward flange. The jig for surface runout measurement of a brake rotor according to claim 1, wherein a flange is provided and a thrust bearing is interposed between both flanges. 3. The cylindrical steady rest has a bearing supporting cylinder provided with an outward flange, and a guide ring fixed to the cylinder portion is located below the outward flange of the bearing supporting cylinder and faces the outward flange. 3. A jig for measuring surface runout of a brake rotor according to claim 1, wherein an inward flange is provided, and a thrust bearing is interposed between both flanges. 4. The rotation transmission / cylinder suspension mechanism has a case in which only the rotation is transmitted by connecting an opening downward to the motor shaft with play, and a case fitted inside the case and sliding in the axial direction. The rotor pressing body that is capable of being prevented from falling out of the case and the upward cam surface that is provided facing the upper portion of the rotor pressing body are respectively brought into contact with and separated from each other, and the rod pressing portion is locked. A pair of followers for releasing is provided, and the rotor pressing body is provided with a rotor pressing ring and a hub pressing ring that are urged downward.
5. A jig for measuring surface runout of a brake rotor according to any one of 3 to 3. 5. A jig for measuring surface runout of a brake rotor according to claim 1, further comprising a centering mechanism for the wheel hub. 6. A centering mechanism for a wheel hub comprises a lower taper cone for pressing a hollow lower surface chamfer of a wheel hub, which is provided on a rod of a rotary cylinder and fitted into a hollow short shaft bearing, and a rotation transmitting / cylinder. The jig for surface runout measurement of a brake rotor according to claim 5, further comprising an upper taper cone which is provided on a rotor pressurizing body of the suspension mechanism and presses the hollow upper chamfer of the wheel hub.