JP2001009601A - Cutting method for rotary brake surface of vehicle brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting method for a brake surface to eliminate a brake surface deflection caused by the tightening force of lug nuts of a rotating element of vehicle brake attached with spindle hub lug nuts. SOLUTION: A rotating body (a brake disk 1) is fitted into a drive shaft 2 of a cutting machine corresponding to a spindle hub. A inner circumferential part 1a of the rotating body is pinched between a part 2a corresponding to a spindle hub flange of the drive shaft 2 corresponding to the spindle hub and a spacer 4 which is the substitute part of a wheel, and then fixed by tightening a lug nut 5 with the same torque as in the actual mounting. A brake face 1c is cut by driving the rotating body 1 by the drive shaft 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating body of a vehicle brake (brake disc or brake drum, the same applies hereinafter).
The present invention relates to a method for cutting the rotation braking surface of the present invention, and it is possible to reduce as much as possible the judder at the time of braking due to slight surface run-out during rotation of the rotation braking surface.

[0002]

2. Description of the Related Art Conventionally, it has been considered that a run-out of a rotary braking surface of a rotating body of a vehicle brake during rotation causes a judder at the time of braking. The processing is performed with high precision, especially using nerves. By the way, the rotating body of the vehicle brake is fitted to the spindle hub and is strongly tightened and fixed by the lug nut while being sandwiched between the spindle hub flange and the wheel. Due to this strong tightening force, a minute distortion is generated in the inner peripheral portion, and the braking portion of the rotating body is slightly distorted due to this distortion, and the precision of the braking surface machined with high precision is impaired, causing surface runout. .

[0003]

SUMMARY OF THE INVENTION The present invention is based on the premise that a rotating body of a vehicle brake is attached to a spindle hub by a lug nut. It is an object of the present invention to devise a method of processing the braking surface so as not to cause runout.

[0004]

Means taken to solve the above problem are constituted by the following elements (a) and (b) or (c) and (d). (A) A rotary body is fitted to a drive shaft of a cutting machine corresponding to a spindle hub, and an inner peripheral portion of the rotary body is sandwiched by a spindle hub flange equivalent portion of the drive shaft and a spacer serving as a wheel substitute. (2) Drive the rotating body with the drive shaft to cut the braking surface. (C) A rotating body is fitted on a drive shaft of a cutting machine corresponding to a spindle hub, and a side surface thereof is fixed with screws while being in contact with one side surface of a portion corresponding to a spindle hub flange of the drive shaft. The spacer is brought into contact with the other side of the spindle hub flange-equivalent portion, and the lug nut is tightened and fixed with the same tightening torque as at the time of mounting. (D) The rotating body is driven by the drive shaft to set the braking surface. Cutting.

[0005]

[Function] When a drive shaft of a cutting machine corresponding to a spindle hub is regarded as a spindle hub of a vehicle and a spacer is regarded as a wheel, the rotating body is mounted on the cutting machine under the same conditions and conditions as those mounted on the vehicle. You. At this time, the same distortion as at the time of mounting occurs in the inner peripheral portion of the rotating body (the portion fastened by the spindle hub flange and the spacer), and the braking portion of the rotating body is slightly distorted with this distortion. That is, the same distortion as in the mounting occurs in the braking unit. In the state where the same distortion as that at the time of mounting occurs, the drive shaft which is a member equivalent to the spindle hub is rotated to cut the braking surface. This cutting process removes the distortion of the braking surface, and is processed into a highly accurate rotating surface. When the rotating body is removed from the drive shaft after the cutting process is completed, the distortion caused by the tightening of the inner peripheral portion of the rotating body is eliminated. Distorted. However, when the rotating body is mounted on the wheel hub of the vehicle, the same distortion as when the rotating body is mounted on the cutting machine is generated in the inner peripheral portion of the rotating body. The braking surface is restored to the same high-precision rotating surface as when it was cut. Therefore, the distortion of the rotation braking surface due to the tightening force by the lug nut and the runout of the braking surface due to the distortion are eliminated.

[0006]

Next, a first embodiment will be described with reference to FIG. The first embodiment is an embodiment relating to a brake disk. In most cases, the brake disk 1 has a cross-sectional shape shown in the drawing, and has an inner peripheral portion 1a of the brake disk 1 fixed to the spindle hub, and a braking portion 1b that is nipped and braked by a brake pad, The side surface of the inner peripheral portion 1a is cut in advance. The drive shaft 2 of the cutting machine is a member corresponding to a spindle hub corresponding to a spindle hub, and the member corresponding to the spindle hub has a flange, that is, a portion 2a corresponding to a spindle hub flange. A wheel mounting lug 3 is fixed to the spindle hub flange equivalent portion 2a. The inner peripheral portion 1a of the brake disc 1 is fitted to the drive shaft 2 (a member equivalent to a spindle hub),
The brake disc 1 is fixed to the drive shaft 2 by sandwiching it between the spindle hub flange equivalent portion 2a and the spacer 4 serving as a wheel substitute, screwing a lug 5 to the wheel mounting lug 3 and tightening. Lug nut 5 at this time
Is set to be the same as the actual tightening torque of the lug nut when the brake disk is mounted on the spindle hub of the vehicle. As a result, the brake disk 1 is mounted on the drive shaft 2 in the same state as when mounted on the spindle hub.
Distortion generated during mounting occurs in the inner peripheral portion 1a. In this state, the braking surface 1c of the brake disk 1 is cut by the cutting tool 6. The cut braking surface 1c has no distortion and does not run out when rotating. When the brake disc 1 is removed from the drive shaft 2 after the cutting process is completed, the inner peripheral portion 1a is
And the inner peripheral portion 1a is not distorted by the tightening force. As a result, the braking surface 1c of the brake disc 1 is distorted in the opposite manner.
When mounted on the spindle hub, the inner peripheral portion 1a is again distorted in the same manner, and the distortion restores the state in which the braking portion 1b has been cut, that is, has no distortion. The second embodiment shown in FIG. 2 is an embodiment relating to a brake drum. In most cases, the brake drum 11 has the cross-sectional shape shown in the figure, and the brake drum 11 is fixed to a spindle hub.
The inner peripheral portion 11a has a braking portion 11b which is braked by being pressed against a brake shoe, and the side surface of the inner peripheral portion 11a is cut in advance. The drive shaft 2 of the cutting machine is a spindle hub equivalent member similar to the drive shaft of the first embodiment, and has a spindle hub flange equivalent portion 2a. A wheel mounting lug 3 is fixed to the spindle hub flange equivalent portion 2a. Inner circumference 11 of brake drum 11
a into a drive shaft 2 (a member equivalent to a spindle hub), and sandwiched between a spindle hub flange equivalent portion 2a and a spacer 4,
The lug nut 5 is screwed into the wheel mounting lug 3 and tightened to fix the brake drum 11 to the drive shaft 2. The tightening torque of the lug 5 at this time is the same as the actual tightening torque of the lug when the brake drum is mounted on the spindle hub of the vehicle. As a result, the brake drum 11 is mounted on the drive shaft 2 in the same state as when mounted on the spindle hub, and distortion caused during mounting due to the tightening by the spindle hub flange equivalent portion 2a and the spacer 4 causes the inner peripheral portion to be distorted. 11a. In this state, the braking surface 11c of the braking portion 11b of the brake drum 11 is cut by the cutting tool 16. The cut braking surface 11c has no distortion, and there is no surface runout when rotating. When the brake drum 11 is removed from the drive shaft 2 after the cutting is completed, the inner peripheral portion 11a
Is released from the tightening force of the spindle hub flange equivalent portion 2a and the spacer 4, so that distortion of the inner peripheral portion 11a due to this tightening force is eliminated. As a result, the braking surface 11c of the braking portion 11b of the brake drum 11 is distorted, but when mounted on the spindle hub, the inner peripheral portion 1c is distorted.
1a is again distorted in the same manner.
1b restores the state without distortion immediately after the cutting. The third embodiment shown in FIG. 3 is another embodiment of the brake disk. The inner peripheral portion 1a of the brake disk 1 is fitted to a drive shaft (a member equivalent to a spindle hub) 2 and the side surface thereof is brought into contact with the spindle hub equivalent portion 2a.
Then, the spacer 4 which is a wheel substitute is brought into contact with the surface opposite to the brake disk contact surface of the spindle hub flange equivalent portion 2a, and the lug nut 5 is screwed into the wheel mounting lug 3 and tightened. The tightening torque of the lug 5 at this time is the same as the actual tightening torque of the lug 5 when mounting the brake disk on the spindle hub of the vehicle. This tightening torque is transmitted by the spacer 4 to the spindle hub flange equivalent portion 2a, causing distortion. Also, the brake disc 1 has a spindle hub flange equivalent portion 2a.
Is screwed and fixed on the inner peripheral portion 1a. In this state, the braking surface 1c of the brake disk 1 is cut by the cutting tool 6. The cut braking surface 1c has no distortion and does not run out when rotating. When the wheel mounting lug 3 is removed after the cutting process is completed, the wheel is released from the tightening force.
The distortion of the inner peripheral portion 1a due to this tightening force is eliminated. For this reason, the braking surface 1c of the brake disk 1 is distorted in reverse, but when mounted on a vehicle, the inner peripheral portion 1a is similarly distorted again. That is, the state is restored to the state without distortion.

[0007]

[Effect] As described above, the rotating body is mounted on the cutting machine under the same support mechanism and mounting conditions as during mounting, and cutting is performed, thereby eliminating the distortion of the braking surface of the braking portion during mounting and during rotation. Surface runout can be prevented. Therefore, it is possible to prevent the occurrence of judder due to the runout of the braking surface. The same effect can be obtained when processing is performed in combination with a rotating body using an actual spindle hub and mounted on a vehicle.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of an embodiment of a brake disk.

FIG. 2 is a partial sectional view of an embodiment of a brake drum.

FIG. 3 is a sectional view of another embodiment of a brake disk.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Brake disk 1a ... Inner peripheral part of a brake disk 1b ... Braking part of a brake disk 1c, 11c ... Braking surface of a braking part 2 ... Drive shaft (member equivalent to a spindle hub) 2a ··· Spindle hub flange equivalent part 3 ··· Wheel mounting lug 4 ··· Spacer as a wheel substitute 5 ··· Lug nut 6 and 16 ··· Cutting tool 11 ··· Brake drum 11a Inner peripheral part 11b: braking part of brake drum 20: screw

Claims (2)

[Claims] A rotating body (brake disc or brake drum) is mounted on a drive shaft of a cutting machine corresponding to a spindle hub.
With the inner peripheral portion of the rotating body sandwiched between the spindle hub flange equivalent portion of the drive shaft and the spacer which is a wheel substitute, and tightened and fixed with a lug nut with the same tightening torque as at the time of mounting. A method for cutting a rotating braking surface of a vehicle brake, wherein the rotating body is driven by a drive shaft to cut the braking surface. 2. A rotating body (brake disc or brake drum) is mounted on a drive shaft of a cutting machine corresponding to a spindle hub.
And fixed with screws in a state where the side surface is in contact with one side surface of the drive shaft corresponding to the spindle hub flange, and the spacer which is a wheel substitute is brought into contact with the other side surface of the spindle hub flange corresponding portion. A method of cutting a rotational braking surface of a vehicle brake, wherein the lug nut is tightened and fixed with the same tightening torque as that used during mounting, and the rotating body is driven by the driving shaft to cut the braking surface.