JP2583782B2 - Disk rotor cooling structure for vehicle disk brake - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk rotor cooling structure of a vehicle disk brake for forcibly cooling a disk rotor.

(Prior art) Even with a disc brake having excellent heat dissipation, if braking is repeated frequently, high-temperature braking heat is generated in the disk rotor, and this braking heat is transmitted to the hydraulic fluid via friction pads and calipers, A cooling structure disclosed in, for example, Japanese Utility Model Laid-Open No. 56-173230 is known because it may cause a fade phenomenon and a vapor lock phenomenon.

In this technology, a disk rotor is mounted on a wheel hub between a disk portion of a wheel and a baffle plate fixed to a vehicle body, a plurality of air holes are provided in the baffle plate, and a cooling fan is mounted on the wheel hub. The fan is rotated integrally with the wheels, and the outside air introduced from the air holes is blown to the outer peripheral portion of the disk rotor that is in sliding contact with the friction pad to perform cooling.

[Problems to be solved by the invention]

However, since the above-mentioned cooling fan is fixed to the wheel hub and rotates at the same speed, when the vehicle is running at a low speed, the cooling fan also rotates at a low speed and the amount of air is weakened, so that a sufficient cooling effect may not be obtained. .

The present invention has been made in view of such circumstances,
It is an object of the present invention to provide a disk rotor cooling structure for a disk brake for a vehicle that has a high cooling efficiency not only when the vehicle runs at high speed but also at low speed.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a disk rotor for a disk brake for a vehicle, which is rotatably attached to a wheel hub pivotally supported by an axle, wherein internal teeth are provided on an inner periphery of the disk rotor, and Pivotally supports the sun gear on the inner peripheral side of the internal teeth, and pivotally mounts a carrier of the planetary gear, and on the carrier, between the internal teeth and the external teeth of the sun gear, on both internal and external teeth. A planetary gear device is configured by pivoting the meshing planetary gears, and a cooling fan is fixed to one side surface of the sun gear.

In this planetary gear system, a sun gear is mounted on an axle,
A cooling fan is pivotally supported on the axle, the cooling fan is provided with an internal gear disposed on the outer peripheral side of the sun gear, and a planetary gear meshing with the internal and external teeth of both gears is pivotally supported on the wheel hub. You may comprise.

Further, in order to further enhance the cooling efficiency, the outer peripheral portion of the disk rotor is provided to be deviated to one side, a plurality of ventilation holes are formed in the outer peripheral portion in the radial direction, and the cooling fan is connected to the inner peripheral side of the outer peripheral portion. It is good to arrange in.

[Action]

According to the above configuration, the rotation of the disk rotor or the wheel hub is transmitted to the cooling fan via the planetary gear unit, and the rotation of the cooling fan is increased in the same or opposite direction as that of the disk rotor, and the rotation is generated by the cooling fan. The swirling wind is sent to the disk rotor to perform forced cooling.

In addition, if a ventilation hole is formed in the outer peripheral portion of the disk rotor deviated to one side and a cooling fan is arranged on the inner peripheral side, the surface area of the outer peripheral portion in sliding contact with the friction pad increases, and Can be sufficiently supplied to increase the cooling efficiency.

〔Example〕

Hereinafter, an embodiment in which the present invention is applied to a front wheel of a motorcycle will be described with reference to FIG. 1 and FIG.

A wheel hub 3 for a front wheel is pivotally supported via a radial bearing 4 on an axle 2 laid on the front fork 1, and a disk rotor 5 is attached to one side surface of the wheel hub 3 with bolts 6.

In the front fork 1, a disc brake caliper 8 is supported by bolts 9, 9 on a bracket 7 projecting from the rear side of the vehicle body, and a pair of friction pads 10, 10 with a disc rotor 5 interposed therebetween. The friction pads 10, 10 are opposed to each other, and pressurize the disk rotor 5, which rotates integrally with the front wheel, by the pressure liquid supplied into the caliper 8 to perform a braking action.

The disk rotor 5 has an outer peripheral portion in sliding contact with the friction pad 10.
5a is displaced to the outside of the vehicle body, and radial ribs are
5b, a ventilated disc having a plurality of air holes 11 opened in the inner and outer peripheries is provided with internal teeth 12 engraved on the inner peripheral surface of an inner peripheral portion 5c fixed to the wheel hub 3; A planetary gear unit 13 and a cooling fan 14 are provided inside the unit.

The planetary gear unit 13 includes the internal teeth 12, a sun gear 15 arranged on the inner peripheral side of the internal teeth 12, a plate-shaped carrier 16, and three planetary gears 17 pivotally supported by the carrier. A sun gear 15 having external teeth 18 engraved on the outer periphery is pivotally supported on the axle 2 via a radial bearing 19 and a carrier 16
Is a serration 2a in the mounting recess 3a of the wheel hub 3.
Are fitted on the axle 2 and the carrier 16 is positioned between the wheel hub 3 and the sun gear 15 on both sides thereof.
Thrust bearings 20, 21 are provided respectively.

Each of the planetary gears 17 is pivotally supported by a support pin 22 on a side of three support arms 16a protruding from the outer periphery of the carrier 16, and is interposed between the internal teeth 12 and the external teeth 18 by the support pins 22.・ External teeth 12,18
Are arranged in mesh with each other.

Further, the cooling fan 14 is fixed to the sun gear 15 with bolts 23, and a plurality of rotors 14a formed on the outer surface are arranged on the inner periphery of the air hole 11 of the disk rotor 5 so as to be substantially flush with each other. You.

The present embodiment is configured as described above, and the wheel hub 3, the disk rotor 5, the sun gear 15, and the cooling fan 14 rotate around the axle 2 and each planetary gear 17 pivotally supported by the carrier 16 has an internal gear. It rotates at a predetermined position between the teeth 12 and the external teeth 18.

 Next, the operation of the present embodiment will be described.

When the wheel hub 3 of the front wheel starts to rotate, the disk rotor 5 integral therewith rotates counterclockwise in FIG. 2 and rotates the three planetary gears 17 meshing with the internal teeth 12 counterclockwise. Further, the rotation of the planetary gear 17 is transmitted to the external teeth 18 to rotate the sun gear 15 and the cooling fan 14 integrated therewith clockwise.

Since the external teeth 18 have a smaller diameter and a smaller gear ratio than the outer internal teeth 12, the rotation of the wheel hub 3 and the disk rotor 5 is transmitted to the sun gear 15 at an increased speed, and the cooling fan 14 is connected to the disk rotor 5. Rotate at high speed in the opposite direction.

As a result, swirling wind is generated on the outer periphery of the cooling fan 14,
The swirling wind passes through the inside of the air hole 11 of the disk rotor 5 and the outer surface of the outer peripheral portion 5a, and cools the outer peripheral portion 5a bearing the braking heat, the friction pad 10, or the caliper 8.

Therefore, unlike the conventional cooling fan, the amount of air blown by the cooling fan that rotates at a higher speed than the wheel hub is increased. By sufficiently blowing the swirling wind, sufficient cooling can be performed.

Further, in this embodiment, the disk rotor 5 is a ventilated disk having a large surface area, and the cooling fan 14 is arranged on the inner periphery of the disk rotor 5 which takes the most braking heat by sliding contact with the friction pad 10. The swirling wind can be effectively supplied to the portion 5a, and the cooling efficiency can be further increased.

FIG. 3 is another embodiment showing a modified example of the planetary gear device. In this embodiment, the carrier used in the above embodiment is omitted.

That is, the planetary gear device 30 is provided with axle 2 serrations.
A sun gear 31 that is axially mounted on 2a, and outside the sun gear 31,
A cooling fan 33 pivotally supported on the axle 2 via a radial bearing 32; an internal gear 34 integrally formed on the outer periphery of an inner portion of the cooling fan 33 and arranged on the outer peripheral side of the sun gear 31; A plurality of planetary gears pivotally supported on the wheel hub 3 by a support pin 37 between the external teeth 35 of the internal gear 34 and the internal teeth 36 of the internal gear 34.
It consists of 38.

Further, a plurality of rotating blades 33a formed in the cooling fan 33.
The air holes 11 of the disk rotor 5 are also
Are arranged so as to be substantially flush with each other on the inner periphery of the.

The planetary gear 38 of the present embodiment revolves around the outer periphery of the sun gear 31 with the rotation of the wheel hub 3 while meshing with the internal and external teeth 35 and 36, and rotates by itself to rotate the rotation to the internal gear 34. introduce.

When the wheel hub 3 and the disk rotor 5 rotate, the planetary gear 38 rotates around the outer periphery of the sun gear 31 together with the wheel hub 3, transmitting its rotation to the internal gear 34, and causing the cooling fan 33 integral with the internal gear 34 to rotate. This embodiment rotates at a high speed in the same direction as the disk rotor 5, and this embodiment also exhibits an excellent cooling effect, particularly at low speed running, similarly to the above embodiment.

In both of the above embodiments, the motorcycle has been described as an example. However, the present invention can be widely applied to other vehicles in which a disk rotor is arranged, and particularly to a rear wheel disk brake in which cooling by traveling wind is difficult. It is suitable.

〔The invention's effect〕

The present invention is configured as described above, and has the following effects.

A planetary gear unit is arranged between the wheel hub or the disk rotor and the cooling fan, and the rotation of the wheel hub is increased by the planetary gear unit to rotate the cooling fan at a high speed in the same direction as or in the opposite direction to the disk rotor. By supplying a large amount of swirling wind generated in the cooling fan to the disk rotor, sufficient cooling can be performed.

This forced cooling can secure a sufficient amount of air for cooling not only during high-speed running but also at low-speed running, so that the cooling efficiency is high.

Also, the outer peripheral portion of the disk rotor which is apt to take braking heat by sliding contact with the friction pad is provided to be deviated to one side, a plurality of ventilation holes are formed in the outer peripheral portion in the radial direction, and the inner peripheral portion of the outer peripheral portion is If the cooling fan is arranged on the side, the swirling wind generated by the cooling fan can be effectively supplied to the outer peripheral portion, and the cooling efficiency can be further increased.

[Brief description of the drawings]

1 and 2 show an embodiment of the present invention. FIG. 1 is a sectional side view of a main part, FIG. 2 is a front view of the same, and FIG. 3 is a cross section of a main part showing another embodiment. It is a side view. DESCRIPTION OF SYMBOLS 1 ... Front fork, 2 ... Axle 3 ... Wheel hub, 5 ... Disk rotor 5a ... Outer peripheral part, 5c ... Inner peripheral part, 11 ... Air hole, 12 ... Internal teeth, 13 ...
Planetary gear set, 14 ... cooling fan, 14a ... rotor, 15 ... sun gear, 16 ... carrier, 17 ... planetary gear, 18 ... external teeth

Claims (3)

(57) [Claims] 1. A disk rotor for a disk brake for a vehicle, which is rotatably mounted on a wheel hub pivotally supported by an axle, wherein internal teeth are provided on an inner periphery of the disk rotor, and a sun gear is provided on the axle. And a planetary gear carrier, which is pivotally mounted on the inner peripheral side thereof, and a planetary gear that meshes with the internal and external teeth between the internal teeth and the external teeth of the sun gear. A disk rotor cooling structure for a vehicle disk brake, wherein a cooling fan is fixedly provided on one side surface of the sun gear. 2. A disk rotor for a disk brake for a vehicle, which is rotatably mounted integrally with a wheel hub pivotally supported by an axle, wherein a sun gear is axially mounted on the axle, a cooling fan is pivotally supported, and the cooling is performed. The fan is provided with an internal gear disposed on the outer peripheral side of the sun gear, while the wheel hub meshes with the internal and external teeth between the internal teeth of the internal gear and the external teeth of the sun gear. A disk rotor cooling structure for a vehicle disk brake, wherein a planetary gear device is constituted by pivotally supporting a planetary gear. 3. The disk rotor according to claim 1, wherein an outer peripheral portion of the disk rotor is deviated to one side, a plurality of ventilation holes are formed in the outer peripheral portion in a radial direction, and a cooling fan is disposed on an inner peripheral side of the outer peripheral portion. The disk rotor cooling structure for a vehicle disk brake according to claim 1 or 2, wherein: