JP2000104765A - Brake or clutch system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance a reliability of a system and to realize a long life due to an abrasion reduction of a pad by carrying out a processing of a rotating disc from a refined steel material and carrying out a processing of a contact surface of the pad in a rotation direction. SOLUTION: Since a refined steel material has a little internal defect and a hardness is high to some degree and uniform, a conformability due to an abrasion is good and a transfer-adhering of the pad to a surface is hardly caused. In order to avoid the transfer-adhering of the pad 2 to a disc as much as possible, a processing direction of a friction surface of the disc 1 is coincident with a rotation direction. In a brake or a clutch system using such a disc 1, since a frictional coefficient becomes large, a variation of a friction force is sensitive to a load variation. As a result, a performance of a load charging device can be made small, a compact of a whole device can be realized. A reliability is enhanced by measuring an urging load and a torque and carrying out a feed back control to the load charging device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake or clutch system, and more particularly to a brake or clutch system suitable for a brake or clutch system requiring control of friction and wear.

[0002]

2. Description of the Related Art The structure of a conventional general brake is shown in FIG.
This will be described with reference to FIG. In the figure, 01 is a brake disc, 02 is a pad pressed by the disc 01, 03 is a pad holder, 04 is a load applying device such as a hydraulic pressure, and 05 is a rotating shaft. In the brake, the pad 02 is pressed against the disk 01 fixed to the rotating shaft 05 by the load controlled by the load applying device 04, and the rotation speed of the rotating shaft 05 is controlled. In the case of a clutch, the pad 02 to be pressed is also attached to a rotatable shaft different from the shaft 05, and power is transmitted between the two shafts by pressing the pad against the disk.

[0003]

The material and surface finish of the disk used for these brakes and clutches are often determined based on past experience and restrictions on processing such as disk size. However, when a resin-based material is used for the pad, the friction and wear characteristics change due to the surface roughness and material of the disk. Therefore, when demands for friction and wear are severe, it is necessary to select an appropriate material and perform surface finishing.

On the other hand, Table 1 shows measurement data examples of friction and wear when the material and surface finish of the disk are changed.

[Table 1]

[0006] When cast iron is used for the disk or when finishing is performed so that a stitch crossing the friction direction (rotational direction) remains, the pad material is transferred to the disk surface, and frictional wear is reduced. Therefore, depending on the performance required of the device, for example, the load-loading device is reduced in size, and when the pressing load is reduced, the material and surface finish that increase the friction are reduced. To achieve this, it is necessary to consider the use of a material and surface finish that reduce friction and wear.

FIG. 15 shows the temperature dependence of wear of the resin-based pad material. Since the wear of the pad material tends to increase as the temperature increases, this temperature dependency must be considered.

[0008]

In order to solve the above-mentioned problems, an invention according to claim 1 is a brake or a brake comprising a rotating disk, a resin-based pad pressed by the disk, and a load applying device. In the clutch system,
A brake or clutch system is provided, wherein the disc is made of a tempered steel material and a contact surface with the pad is machined in a rotational direction.

According to a second aspect of the present invention, there is provided a brake or clutch system including a rotating disk, a resin-based pad pressed against the disk, and a load applying device, wherein a contact surface of the disk with the pad is provided. A brake or clutch system characterized by being machined in a direction transverse to the direction of rotation.

According to a third aspect of the present invention, there is provided a brake or clutch system comprising a rotating disk, a resin-based pad pressed against the disk, and a load applying device, wherein the disk has a contact surface with the pad. Provided is a brake or clutch system, wherein a micro hole is formed.

According to a fourth aspect of the present invention, there is provided a brake or clutch system comprising a rotating disk, a resin pad pressed against the disk and a load applying device, wherein the disk is made of a porous material. A brake or clutch system is provided.

According to a fifth aspect of the present invention, there is provided a brake or clutch system comprising a rotating disk, a resin pad pressed against the disk, and a load load device, wherein a means for cooling the disk or the pad is provided. And a brake or clutch system.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. First, FIGS. 1 and 2 show a brake system, in which 1 is a brake disk made of a tempered steel material and whose surface is processed in a rotational direction, and 2 is a pad made of a resin material. . As the resin material, a phenol resin material such as an aramid fiber reinforced phenol resin and an asbestos-containing phenol resin can be used. 3 is a pad holder, 4
Is a load applying device, and 5 is a rotating shaft.

3 and 4 show a clutch system, in which 6 is a disk for holding a pad in the clutch, and 7 is a rotating shaft of the disk for holding the pad.

Since the tempered steel material has few internal defects and a high hardness to some extent and is uniform, it has good conformability due to friction, and the transfer of the pad material to the surface hardly occurs. Therefore, it is advantageous when the friction is increased by the same pressing load. In this embodiment, the processing direction of the friction surface of the disk 1 is made to coincide with the rotation direction in order to avoid transfer of the pad material to the disk as much as possible. As a method for processing the surface of the disk, for example, a method of cutting with a lathe can be applied. The surface roughness may be finished to about 1 to 5 μm.

In the brake or clutch system using the disk as in the above-described example, the friction coefficient (the value obtained by dividing the friction force by the pressing load) becomes large, so that the change in the friction force is sensitive to the change in the load. become. As a result,
The capacity of the load applying device can be reduced, and the entire device can be made compact. In addition, by measuring the pressing load, torque, etc. and performing feedback control on the load load device, it leads to improvement in reliability.
A load and torque measuring device and a load control device may be added.This makes it possible to control the load in response to the optimal pressing load change condition, and to improve the reliability of the device and extend the life by reducing pad wear. Can be measured.

Next, a second embodiment of the present invention will be described with reference to FIGS. In the present embodiment,
The surface of the disk 8 to be rubbed is provided with a cut in the direction of friction, that is, in the direction transverse to the direction of rotation.

As described above, by providing the surface of the disk 8 with a processing line crossing the direction of friction, accumulation of wear particles on the processing line is promoted, transfer of the pad material to the disk occurs, and friction of the pad is generated. Wear can be reduced. The processing of the disk is performed using, for example, surface grinding. The surface roughness may be finished to about 1 to 5 μm. In this embodiment, since the friction coefficient between the disk and the pad is low, the change of the frictional force with respect to the load is small. Therefore, the first
Although the load measuring device and the load control device as shown in the embodiment are not applied, the load measuring device and the load control device may be provided for improving reliability.

Next, a third embodiment of the present invention will be described with reference to FIGS. In the present embodiment,
A large number of fine holes are provided on the surface of the disk 9 to be rubbed.

By providing a large number of fine holes on the surface of the disk 9, it is possible to reduce frictional wear of the pad. The micropores are formed using a method such as pushing an indenter. The depth of the micropores is 10 to 30 μm
Degree and pore diameter may be about 100 to 500 μm. As a result, the coefficient of friction between the disk and the pad is reduced, and the change of the frictional force with respect to the load is reduced. Therefore, the load measuring device and the load control device as shown in the first embodiment are not applied, but the load measuring device and the load control device may be provided for improving reliability.

In the second and third embodiments described above,
By forming the transfer layer of the pad material on the disk surface, it is possible to expect effects such as a reduction in wear of the pad, a longer life of the pad, and a reduction in the number of maintenances. Further, since the friction coefficient is low, a large change in the frictional force due to a slight load change is unlikely to occur, so that a stable braking force can be obtained. Note that, in the second and third embodiments, examples of the brake system have been described, but it is apparent that the present invention is also applicable to a clutch system.

Next, a fourth embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the disk 10 is made of a porous material, for example, an iron-based sintered material. As a result, it is possible to promote the accumulation of wear particles on the fine holes existing on the disk surface, to cause the transfer of the pad material to the disk, and to reduce the frictional wear of the pad. In addition, the coefficient of friction between the disc and the pad decreases, and the change in frictional force with respect to the load decreases.
Although the load measuring device and the load control device as described in the first embodiment are not applied, a load measuring device and a load control device may be provided for improving reliability.

In the fourth embodiment, by producing a transfer layer of the pad material on the disk surface, effects such as reduction of the wear of the pad, prolongation of the life of the pad, and reduction of the number of maintenance can be expected. . In addition, since the friction coefficient is low, a large change in the frictional force due to a slight load change is unlikely to occur, so that a stable braking force can be obtained. Further, even when the disk is worn, the fine holes do not disappear and the fine holes repeatedly appear on the friction surface. Therefore, it is possible to prevent the pad from increasing due to the formation of the transfer layer due to the wear of the disk. In the present embodiment, an example of the brake system is shown, but it is apparent that the present invention is also applicable to a clutch system.

Next, a fifth embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. In the present embodiment, the disk 11 is configured to be cooled by the disk cooling device 12. By cooling the disk 11 with the disk cooling device 12, the friction surface temperature can be reduced, and the wear of the pad 2, which is a resin material, can be reduced. Thereby, the life of the pad is extended, and the number of maintenance operations can be reduced. As the cooling device 12, a fan that sends air, a cooling water circulation device that rotates with the disk, or the like can be used. In this example, cooling is performed from the disk side, but cooling from the pad side may be performed.
Further, in this example, the load measuring device and the load control device as shown in the first embodiment are not applied, but the load measuring device and the load control device may be provided for improving reliability. In the present embodiment, an example of the brake system has been described, but it is apparent that the present invention is also applicable to a clutch system. Moreover, you may use it in combination with 1st-4th embodiment.

[0025]

According to the present invention, in a brake or clutch system using a resin-based pad, a large brake which contributes to an improvement in the durability of the pad by taking into account the surface processing or surface shape of the disk and the surface temperature. Or a clutch system can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view showing a brake system according to a first embodiment of the present invention, and is a view taken along the line II of FIG. 2;

FIG. 2 is a side view showing the brake system according to the first embodiment of the present invention.

FIG. 3 is a front view showing the clutch system according to the first embodiment of the present invention, and is a view taken in the direction of arrows III-III in FIG.

FIG. 4 is a side view showing the clutch system according to the first embodiment of the present invention.

FIG. 5 is a front view showing a brake system according to a second embodiment of the present invention, and is a view taken along the line VV of FIG. 6.

FIG. 6 is a side view showing a brake system according to a second embodiment of the present invention.

FIG. 7 is a front view showing a brake system according to a third embodiment of the present invention, and is a view taken along the line VII-VII of FIG.

FIG. 8 is a side view showing a brake system according to a third embodiment of the present invention.

FIG. 9 is a front view showing a brake system according to a fourth embodiment of the present invention, and is a view taken in the direction of arrows IX-IX in FIG. 10;

FIG. 10 is a side view showing a brake system according to a fourth embodiment of the present invention.

FIG. 11 is a front view showing a brake system according to a fifth embodiment of the present invention, and is a view taken along the line XI-XI of FIG. 12;

FIG. 12 is a side view showing a brake system according to a fifth embodiment of the present invention.

FIG. 13 is a front view showing a conventional brake system, and is a view taken in the direction of arrows XIII-XIII in FIG. 14;

FIG. 14 is a side view showing a conventional brake system.

FIG. 15 is a graph showing temperature dependence of wear of a resin-based pad material.

[Explanation of symbols]

 1, 6, 8, 9, 10, 11 Disk 2, 7 Pad 3 Pad holder 4 Load applying device 5 Rotation axis 6 Disk cooling device

[Table 1]

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16D 69/00 F16D 69/00 WF Term (Reference) 3J056 AA34 AA58 BA02 BB07 BC03 BE12 BE17 CA04 CA05 CA09 EA03 EA18 EA23 EA26 FA04 3J058 AA43 AA48 AA53 AA62 BA37 BA76 CB28 CB29 EA03 GA54 GA92 GA93

Claims (5)

[Claims] 1. A brake or clutch system comprising a rotating disk, a resin-based pad pressed against the disk, and a load applying device, wherein the disk is made of a tempered steel material and a contact surface with the pad is formed. A brake or clutch system characterized by being machined in the direction of rotation. 2. A brake or clutch system comprising a rotating disk, a resin-based pad pressed against the disk, and a load applying device, wherein a contact surface of the disk with the pad is machined in a direction transverse to a rotation direction. Brake or clutch system characterized by being performed. 3. A brake or clutch system comprising a rotating disk, a resin-based pad pressed against the disk, and a load device, wherein a fine hole is formed in a contact surface of the disk with the pad. A brake or clutch system, characterized in that: 4. A brake or clutch system comprising a rotating disk, a resin pad pressed against the disk and a load device, wherein the disk is made of a porous material. . 5. A brake or clutch system comprising a rotating disk, a resin pad pressed against the disk and a load device, wherein a means for cooling the disk or pad is provided. Or clutch system.