JPH051703Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] <Industrial application field> The invention forms two rows of ventilation holes radially and in the axial direction inside the rotor's outer peripheral wall. This article relates to a ventilated brake rotor.

<Prior Art> As the performance of vehicles increases, disc brake devices are frequently used which are configured so that a friction pad is brought into pressure contact with an annular friction plate that rotates together with an axle.

As a brake rotor used in this brake device, a so-called ventilated brake rotor is known in which radial ventilation holes are provided inside the thick friction plate to increase heat dissipation efficiency. Compared to a solid brake rotor, where only its outer surface is in contact with the atmosphere, a ventilated brake rotor, which is hollow, can radiate heat from within, resulting in an extremely high cooling effect. Obtainable.

On the other hand, in order to improve the performance of such ventilated brake rotors, for example,
As disclosed in Japanese Patent No. 80535, a structure in which two rows of holes are provided in the axial direction of the brake rotor has been proposed. According to this structure, it is possible to equalize the heat capacity of the sliding surface of the brake rotor with the friction pad on both sides, so that further improvement in braking performance can be expected.

By the way, as disclosed in the same publication, the structure of such a ventilated brake rotor includes an annular plate extending radially outward around the open end side of a central cylinder connected to the axle. Generally, a friction plate is connected to the annular plate through a number of ribs arranged radially to both end faces in the axial direction. The cavity provided with ribs between the annular plate and the friction plate is configured to obtain ventilation through an opening provided along the connecting portion between the central cylinder and the friction plate.

<Problem to be solved by the invention> However, when it comes to brake rotors for vehicles,
It is customary for road wheels to be attached to portions of a central cylinder that are secured to both ends of the axle. Therefore, one surface of the brake rotor is covered by the road wheel, which tends to deteriorate the flow of cooling air into the ventilation holes, which are generally located on the outside of the vehicle body. Therefore, in the conventional structure, although two rows of air holes were provided to equalize the heat capacity of the brake rotor itself, it was not possible to prevent local temperature increases caused by uneven cooling air volume. First, it is conceivable that this is insufficient to eliminate uneven wear of the friction pads or deformation of the rotor disk.

The present invention was devised to solve the problems of the prior art, and its main purpose is to provide a ventilated brake rotor that is improved in order to further equalize the cooling efficiency on both sides of the brake rotor. There is a particular thing.

[Structure of the invention] <Means for solving the problem> According to the invention, this purpose is to provide a central cylindrical body having an attachment portion for the axle that extends circumferentially outward in the radial direction from an open end located inside the vehicle body. and a pair of friction plates respectively fixed through a large number of ribs arranged radially to both end surfaces in the axial direction of the annular plate, and the friction plate is located inside the vehicle body. Between the friction plate and the annular plate, and between the annular plate and the friction plate located on the outside of the vehicle body, there is provided an air space for ventilation that communicates the inner circumferential side and the outer circumferential side of the friction plate.
A ventilated brake rotor comprising a ventilated brake rotor, in which a vent hole that communicates between an air space between the annular plate and the friction plate located on the outside of the vehicle body and an inner side of the vehicle body of the annular plate is provided. This is achieved by providing a ventilated brake rotor, which is characterized in that it is provided on the inner periphery of an annular plate.

<Function> In this way, if the ventilation holes for the ventilation holes located on the outside of the car body are also opened in the part of the annular plate facing the inside of the car body, the amount of ventilation on both sides of the brake rotor can be adjusted appropriately. This makes it possible to equalize the temperature rise on both sides of the brake rotor. In particular, by providing ventilation holes on the inner circumferential side of the annular plate, cooling of the connection part with the central cylinder is promoted,
This can alleviate the tendency for thermal stress to concentrate in the same area.

<Embodiments> Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 show an embodiment of a brake rotor constructed based on the present invention. This brake rotor 1 has a central cylindrical body 3 having a bottomed cylindrical shape formed at its bottom 2, and a central cylindrical body 3 that is fixed to the axle.
The annular portion 4 is formed of an annular plate 5 formed by being directly connected to the open end of the central cylinder 3, and a friction plate (not shown). It consists of a pair of friction plates 6a and 6b fixed to both the inner and outer surfaces of the annular plate 5 so as to be in direct sliding contact with the pads.

The annular plate 5 and each friction plate 6a, 6b are connected via a large number of ribs 7a, 7b arranged radially and alternately in the circumferential direction. and each friction plate 6a, 6b
Two rows of ventilation holes 8a and 8b are defined in the axial direction between the rotor and the rotor, in the same manner as in a known hollow brake rotor.

The friction plate 6a located on the outside of the vehicle body is attached to the central cylinder body 3.
The entire circumference is directly connected to the outer circumference of the Further, the inner peripheral edge of the friction plate 6b located inside the vehicle body is opened radially inward, and at the same time, its inner diameter is larger than the inner diameter of the central cylinder 3. And the outer friction plate 6a and the annular plate 5
A ventilation hole 9 is provided on the circumference of the central cylindrical body 3 corresponding to the air hole 8a between the two and is connected to the air hole 8a. As a result, the air space 8 on both sides of the annular plate 5 is
a, 8b are all connected to the inner circumference of the central cylinder 3 and the annular plate 5.
The outer periphery of the radial direction is equally communicated with the outer periphery of the radial direction.

An annular plate 5 adjacent to the inner peripheral edge of the inner friction plate 6b
At the inner peripheral portion of the annular plate 5, ventilation holes 10 communicating with the outer cavity 8a of the annular plate 5 are arranged continuously on the same circumference. As a result, the area of the ventilation hole on the inner peripheral side of the rotor for each air hole 8a, 8b can be made larger on the outside of the car body than on the inside of the car body, so that the amount of ventilation for the friction plate 6a facing the outside of the car body is insufficient. It is possible to improve the tendency and increase the amount of heat dissipation. The inner circumferential edge of this vent hole 10 facing into the air 8a is chamfered 11 on the radially outer side in order to reduce ventilation resistance.

Generally speaking, the outside surface of the brake rotor is covered by the road wheel, which reduces its heat dissipation efficiency and makes it difficult to equalize the temperature rise on both sides of the friction plates. Therefore, in the present invention, as shown in the above embodiment, a ventilation hole 10 communicating with the outer air hole 8a is provided in the inner circumferential portion of the annular plate 5 facing the inside of the vehicle body. By ensuring sufficient ventilation, we aim to equalize the temperature distribution on both sides of the friction plate. At the same time, the cooling of the connecting portion of the outer friction plate 6a with the central cylindrical body 3 is further promoted to prevent thermal stress from concentrating on this portion.

<Effects of the invention> As described above, according to the invention, by opening the ventilation holes for the ventilation air located on the outside of the car body to face the inside of the car body, the cooling efficiency of the rotor as a whole is increased, and at the same time, The heat dissipation efficiency can be adjusted according to the difference in the amount of ventilation, and the temperature increase state on both sides of the friction plate can be made uniform. Therefore, it is particularly effective in promoting cooling of the connecting portion between the central cylinder and the friction plate, preventing deformation of the annular plate including the friction plate, and stabilizing braking performance.

[Brief explanation of the drawing]

FIG. 1 is a partial side view showing the inner surface of the vehicle body of a brake rotor constructed based on the present invention, with a portion cut away, and FIG. 2 is a sectional view along the radial direction of the brake rotor. FIG. 3 is a side view similar to FIG. 1 seen from the outside of the vehicle body. DESCRIPTION OF SYMBOLS 1... Brake rotor, 2... Bottom, 3... Central cylinder, 4... Annular part, 5... Annular plate, 6a, 6
b...Friction plate, 7a, 7b...Rib, 8a, 8b
...Empty〓, 9,10...Ventilation hole, 11...Chamfer.

Claims (1)

[Claims for Utility Model Registration] An annular plate extending radially outward from an open end located inside the vehicle body of a central cylindrical body having a mounting portion for the axle, and both end surfaces of the annular plate in the axial direction. A pair of friction plates are respectively fixed through a large number of radially arranged ribs, and the friction plates are located inside the vehicle body, and between the friction plates and the annular plate, and between the annular plate and the outside of the vehicle body. The ventilated brake rotor is provided with a ventilating air space that communicates between the inner circumferential side and the outer circumferential side of the friction plate between the friction plate located therein, the annular plate and the outer side of the vehicle body. A ventilated brake rotor characterized in that a vent hole is provided in an inner circumferential portion of the annular plate to communicate an air space between the friction plate and the inner part of the annular plate to the inside of the vehicle body.