JP2001159435A - Air-cooled brake disc - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disc part of a brake disc having no thermal distortion and satisfactory cooling performance. SOLUTION: A hub 2 and the disc part 3 are connected to each other by pins 14 so as to be movable slightly loosely. In the disc part 3, a plurality of baffle plates 5, 5 are arranged between two friction plates 4, 4, the friction plates 4 and the baffle plates 5, and the baffle plates 5 are connected by a blade shaped heat transfer plates 6 to form ventilation passages 7, and an air inlet 13 is provided between the pins 14, 14. Frictional heat generated on the disc part 3 is cooled by air to be allowed to flow from the air inlet 13 via the ventilation passages 7, and it is transmitted from two friction plates 4 and a plurality of baffle plates 5 via the pins 14 to the hub 2 and then cooled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mainly used for disc brakes of motorcycles and four-wheeled vehicles, and a disc portion having an air passage can expand independently of a hub when receiving braking frictional heat. Thus, the present invention relates to a floating type air-cooled brake disk.

[0002]

2. Description of the Related Art In a brake disk having a disk portion integrated with a hub, a brake disk provided with an air passage in the disk portion to air-cool braking friction heat to prevent overheating and thermal distortion of the disk portion is disclosed in, for example, It is known from JP-A-63-36730. This brake disc is formed integrally with a disc portion in which one intermediate plate is connected between a hub and two friction plates by radial fins, and the intermediate plate forms two rows of ventilation paths inside the disc portion. The disk portion is cooled by the air passing through the ventilation passage.

In the above-mentioned brake disk, since the hub and the disk portion are integrated, it is assumed that the thermal expansion of the disk portion is restrained by the hub, so that thermal distortion is likely to occur on the friction surface, and the air cooling function is not sufficient.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a brake disc which can prevent thermal distortion and overheating of the disc portion.

[0005]

According to a first aspect of the present invention, there is provided an air-cooled type having a hub and a disk portion, and having an outward ventilation passage inside the disk portion. In a brake disk, a hub and a disk portion are separated, and a plurality of air guide plates parallel to the friction plates are arranged between two friction plates, and a number of transmissions are performed between the friction plates, the air guide plates, and the air guide plates. Combined with a hot plate to form a ring-shaped disk portion with a ventilation path inside, and on the inner periphery of the disk portion, a large number of concave portions and inner peripheral concave portions are alternately provided over the friction plate and the air guide plate. A recess is provided on the outer periphery of the hub opposite to the recess of the disk portion, and a pin hole is formed by both recesses, and an air inlet is formed by the inner recess and the outer peripheral surface of the hub, and the pin is engaged with the pin hole. And the hub and the disk portion are connected.

According to this means, the hub and the disk section are
The disk portion is coupled so as to be micro-movable, and is cooled by air passing through the ventilation passage and by heat transfer via the pins.

[0007] The means described in claim 2 is equivalent to claim 1.
Wherein the friction plate, the air guide plate and the heat transfer plate are fixed by brazing to form a disk portion. According to this means, each member is fixed with good heat conductivity.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, reference numeral 1 denotes an air-cooled brake disk of the present invention, which rotates in the direction of arrow A. 2 is a hub and 2a is a mounting hole to the axle.
Reference numeral 3 denotes a ring-shaped disk portion, and the disk portion 3
A friction plate 4 on both sides, two baffle plates 5 parallel to and inside the friction plates 4 and 4, a heat transfer plate 6 connecting the friction plate 4 and the baffle plate 5, Heat transfer plate 6 connecting wind plates 5
And a ventilation passage 7 partitioned by these members is formed. A large number of heat transfer plates 6 are inclined in the retreating direction as shown by broken portions in FIG. In the drawing, reference numeral 4a denotes an escape groove for abrasion powder and the like provided on the surface of the friction plate 4.

The inner peripheral surface of the disk unit 3
And the inner circumferential recess 9 which is long in the circumferential direction,
The concave portions 8 and the inner peripheral concave portions 9 are provided not only on the friction plates 4 on both sides, but also
It is also formed on the intermediate air guide plate 5 and heat transfer plate 6.

The friction plate 4, the air guide plate 5, and the heat transfer plate 6 are made of a metal plate having high rigidity. Preferred for efficiency. However, they can be integrated by brazing or welding sequentially. The heat transfer plate 6 is
It may be provided in the radial direction without being inclined.

On the outer peripheral surface 2b of the hub 2, eight convex portions 10 shown in FIG. 3 are provided at regular intervals, and concave portions 11 are provided outward here. When the recesses 8 and 11 are opposed to each other, a pin hole 12 divided into two is formed by these, and an air inlet 13 is formed by the inner circumferential recess 9 and the outer circumferential surface 2 b of the hub 2, and the ventilation inside the disc portion 3 It communicates with Road 7.

The pin 14 is made of a highly rigid metal and has a flange 14a at one end and a small diameter portion 14b at the other end.
If this pin 14 is inserted into each pin hole 12 and a washer 15 is fitted into the small diameter portion 14b and the end is crimped, the hub 2 and the disc portion 3 are locked via the pin 14, but each member is locked. It is locked in a state where it is possible to make a slight relative movement in the circumferential direction and the radial direction within the range of the set gap. Accordingly, when the brake disc 1 is rotating, the braking torque generated by clamping the disc portion 3 with a brake pad (not shown) is
The disk portion 3 can be thermally expanded by frictional heat without being restrained by the hub 2, and no thermal distortion occurs.

The air entering through the air inlet 13 and passing through the ventilation path 7 is urged from each member by the rotation of the disk portion 3 and is discharged from the outer periphery by centrifugal force. And two air guide plates 5 and many heat transfer plates 6
As a result, heat can be absorbed from a wide surface of each member, and the disk portion 3 can be effectively cooled. Further, the pin 14 comes into contact with the two friction plates 4 and the air guide plate 5,
If the heat transfer plate 6 is located in the concave portion 8, the heat transfer plate 6 contacts the concave portion 8, so that the heat transfer area of the disk portion 3 in contact with the pin 14 is large, and the heat of the disk portion 3 is transmitted to the hub 2 for cooling. Useful.

Although eight pins 14 are used in the above embodiment, the number of pins can be set to an appropriate number according to the braking torque.

[0015]

As is apparent from the above description, according to the first aspect of the present invention, since the hub and the disk are separate bodies, the disk is not restrained by the hub even if the disk expands or contracts due to frictional heat. There is an effect that thermal distortion does not occur. Further, since two or more air guide plates and a large number of heat transfer plates are provided in the ventilation path, the heat radiation area is large, and in the pin hole, two friction plates and at least two air guide plates are provided. Therefore, the heat transfer area between the pin and the pin is large, and both have an effect of helping to cool the disk portion.

According to the second aspect of the present invention, since each member is made of a plate material and fixed by brazing, the manufacture is simple and the heat transfer is good.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX and YY of FIG.

FIG. 3 is an exploded perspective view showing only a part.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Brake disk 2 Hub 3 Disk part 4 Friction plate 5 Air guide plate 7 Ventilation path 8,11 recessed part 9 Inner peripheral recessed part 1
2 pin hole 13 air inlet 14 pin

Claims (2)

[Claims] 1. An air-cooled brake disk having a hub and a disk portion and having an outward ventilation passage inside the disk portion, wherein the hub and the disk portion are separated from each other, and the friction plate is provided between two friction plates. Arrange a plurality of parallel air guide plates, and connect the friction plate and the air guide plate with each other with a number of heat transfer plates,
Construct a ring-shaped disk portion with a ventilation path inside, and on the inner periphery of the disk portion, over the friction plate and the air guide plate,
A large number of concave portions and an inner peripheral concave portion are provided alternately, a concave portion facing the concave portion of the disk portion is provided on the outer periphery of the hub, and a pin hole is formed by both concave portions, and an air inlet is formed between the inner peripheral concave portion and the outer peripheral surface of the hub. An air-cooled brake disc characterized in that a hub and a disc portion are connected by locking a pin in a pin hole. 2. The air-cooled brake disk according to claim 1, wherein the friction plate, the air guide plate and the heat transfer plate are made of a plate material and fixed by brazing to form a disk portion.