JPS5915777Y2 - Vehicle brake disc mounting structure - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the installation structure of a split type brake disc for a vehicle.

A brake disc has a disc structure that is attached to an axle separately from the wheels. A brake shoe is pressed against the side surface of the disc body of the brake disc, and the friction force generated by the brake disc generates braking force.

Therefore, the disk body is heated to a high temperature by frictional heat when pressed by the brake shoes, and as the temperature rises, thermal expansion occurs.

However, in conventional brake disc structures in which the brake disc body is firmly fixed with bolts to a disc seat that is fitted and fixed to the axle, the sliding and mounting parts of the disc body are limited in order to restrict thermal expansion of the disc body. High thermal stress was generated in the circumferential and radial directions, leading to cracks.

Furthermore, the disc body is subject to various mechanical stresses such as centrifugal force due to high-speed rotation, frictional force and rotational torque due to the pressing of the brake shoes, so in conventional brake disc structures, the pressing of the brake shoes is caused by force. It was necessary to limit the number of rotations.

That is, a conventional brake disc whose purpose is not to restrict thermal expansion of the disc body will be explained with reference to FIGS. 4 and 5.

Figure 4 shows the outer periphery of the disc seat fitted and fixed to the axle a.
Insert the four pins d radially from the center, insert the two-part disc main body C from the direction of the arrow shown so as to wrap around the pins d, and tighten with the portions (pole)e and nara)-f to form a brake disc. It is an assembled front view.

In such a structure, if the pressing force of the brake shoes is increased to obtain a larger braking force, it is necessary to further increase the number of pins d that transmit the braking force, and the direction of the pins d is radial. Therefore, the pins do not fit into the pin holes provided in the disk body, and it is necessary to increase the number of divisions of the disk body C according to the number of pins d, which poses problems in terms of handling and weight.

FIG. 5 is a sectional view of a brake disc in which a thin cylindrical part k is formed on the end face of a disc seat g which is fitted and fixed to an axle a, and a disc body is fastened to the tip of the disc seat g by bolts i and nuts j.

In such a structure, the thin cylindrical portion of the disk seat must be made as thin as possible to allow thermal expansion of the disk body, but for high-speed rotation, the large centrifugal force caused by rotation is This creates a paradoxical problem in that the thickness must be increased in order to increase the strength of the disk, which in turn restricts the thermal expansion of the disk itself, resulting in high thermal stress.

The present invention was developed to improve these drawbacks, and does not restrict the thermal expansion caused by the temperature rise of the disc body, and furthermore, strongly presses the brake pads due to force-induced frictional force, rotational torque, or high The purpose of the installation of a brake disc for a vehicle is to provide a structure that can withstand centrifugal force due to rotational speed and is easy to assemble and disassemble.

In the present invention, the brake disc is attached to the disc seat via pins provided on the inner peripheral surface of the disc body, and the pins are arranged radially toward the center of the axle.

On the other hand, the disc seat is provided with a flange, and a groove with a semicircular cross section that engages with the pin is provided in the flange, and the disc seat is combined with a presser plate that also has a groove, thereby compressing the pin. This is to connect the disk main body and the disk seat that is fitted and fixed to the axle.

An embodiment of the present invention that can achieve the above object will be described with reference to the drawings. In FIGS. 1 to 3, ] is an axle, and a disk seat 2 is fitted and fixed to this axle 1.

The disc seat 2 has a flange-like flange on the outer periphery of the fitting cylindrical part, and a plurality of grooves 21 each having a semicircular cross section are provided radially from the center on one side of the flange at appropriate intervals.

The flange of the disc seat 2 is further provided with a large number of bolt holes 22 passing through the flange surface.

On the other hand, the disk main body 3 has an annular structure in which the annular body is divided into a plurality of parts, and a plurality of pins 31 are arranged radially toward the center on the inner peripheral surface of the divided annular disk main body 3. In Figures 1 to 3, six protrusions are provided.

The arrangement and size of this pin 31 are determined by the strength requirements of the disk body 3, and it is formed so as to engage with the groove 21 of the disk seat 2, and only half of the cross section of the pin 31 is formed in the groove 21.
The device is configured to fit inside the device.

On the other hand, the presser plate 4 has a disk shape and has an axle through hole 41 in the center, and has a plurality of semicircular grooves 43 in cross section that are the same as the grooves 21 provided in the disk seat 2 on one side. A bolt hole 42 is opened corresponding to the bolt hole 22 opened in the disk seat 2.

When assembling the brake disc, engage the groove 21 of the disc seat 2 with the groove 43 of the press plate 4 so that the pin 31 protruding from the inner circumferential surface of the disc body 3 is inserted from the left and right, and A bolt 5 is inserted into the bolt hole 22 and the bolt hole 42 of the holding plate 4 and tightened with a nut 51.

Therefore, the disc body 3 formed in an annular shape by the bolts and nuts 5.51 is connected to the disc seat 2 which is fitted and fixed to the axle 1 via the pin 31, and the pin of the disc body 3 31 does not come out of the disc seat 2 due to the centrifugal force during rotation, and the disc seat 2
There is no inward movement of either.

At this time, the divided end surfaces 32 of the disk main body 3 are attached with an appropriate gap set between them.

Since the present invention is constructed as described above, when thermal expansion occurs in the disc body 3 due to temperature rise during braking, the disc body 3 can freely expand in the radial direction along with the pin 31. It can also expand freely in the circumferential direction due to the gap between the divided end faces of the disk body 3, and since thermal expansion is not restricted, little thermal stress is generated.

In addition, the frictional force and rotational torque accompanying the pressing of the brake shoe during braking of the disc body 3 are all transmitted and held by the pins 31, and the number and size of the pins 31 depend on the magnitude of the centrifugal force and rotational torque. can be freely selected.

Therefore, it is possible to obtain a brake disc that can withstand a greater braking force than the conventional brake disc even if the disc has the same outer circumferential diameter.

Also, replacing the brake disc body 3 due to wear is the third step.
As shown in the figure, the divided disk body 3 can be removed together with the pin 31 by simply loosening the nut 51 and removing the presser plate 4, so that the work efficiency during replacement can be greatly improved.

In the embodiment, the disc body is divided into two parts, but it is also within the scope of the present invention to divide the disc body into three or more parts.

Furthermore, from the present invention in which the disk body is provided with pins, a structure in which the disk body is integrated without being divided can be easily conceived.

[Brief explanation of the drawing]

Figures 1 to 3 show an example of the mounting structure of a vehicle brake disc according to the present invention, in which Figure 1 is a front view, Figure 2 is a sectional view, and Figure 3 is an exploded perspective view. , Fig. 4 is a front view showing the structure of a conventional brake disc that does not restrict the thermal expansion of the disc body, and Fig. 5 is a sectional view showing the structure of a conventional brake disc in which the thermal expansion of the disc body is relaxed. . 1... Axle, 2... Disk seat, 21... Groove, 3
...Task body, 31...Pin, 4...Press plate, 41...Axle through hole, 43...Groove, 5...Bolt.

Claims (1)

[Scope of utility model registration request] A disk seat that is fitted and fixed to the axle and has a flange having a plurality of grooves with a semicircular cross section radially from the center of the axle on one side, an axle through hole in the center, and a disk seat that is the same as the disk seat on one side. A presser plate having a plurality of radially arranged grooves each having a semicircular cross section, and a split annular disk having a plurality of pins protruding radially from its inner peripheral surface to engage with each groove of the disk seat and the presser plate. A disk seat and a presser plate are connected by bolts and nuts so as to hold the pin under pressure, and the split annular disk body is connected to the disk seat via the pin. The installation of vehicle brake discs is structural.