JPH08135695A - Disc brake device for vehicle - Google Patents

Abstract

PURPOSE: To improve performance with small processing steps and number of part items by dividing a brake disc into an outer peripheral part and an inner peripheral part, and providing an outer peripheral brake caliper and an inner peripheral brake caliper respectively on the outer peripheral part and the inner peripheral part. CONSTITUTION: A brake disc 24 is divided into an outer peripheral part 24a and an inner peripheral part 24b with an installation bolt 25 to a disc hub 22 being a boundary. The brake disc 24 is provided with an outer peripheral brake caliper 26 at its outer peripheral part 24a and an inner peripheral brake caliper 27 at its inner peripheral part 24b. The brake calipers 26, 27 are operated for braking by press-contacting pads arranged on both sides of the brake disc 24 with the brake disc 24 from both sides. A frictional area between pads and the brake disc is enlarged, so that braking performance substantially equal to that with two brake discs is obtained with weight of one brake disc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle disc brake device.

[0002]

2. Description of the Related Art A vehicle is equipped with a brake device for decelerating or stopping the vehicle while it is running. As the brake device, a friction type brake device that brakes by using friction is generally used, and is roughly classified into a drum brake device and a disc brake device.

Among them, the disc brake device is a device in which a disc-shaped brake disc which is fixed to a wheel hub and rotates together with the hub is strongly sandwiched by pads from both sides to perform braking, which is contrary to the drum brake. Since the brake disc is exposed to the atmosphere, heat dissipation is good, the change in braking force is small, and stable performance is exhibited. In particular, in recent motorcycles, it has become common to equip front wheels or front and rear wheels with disc brake devices.

By the way, in motorcycles, it is necessary to improve the performance of the disc brake device as the engine output increases. For that purpose, the friction area between the pad and the brake disc may be increased, and generally, a double disc brake device in which the brake discs are provided on both sides of the front wheel is widely adopted. Further, there is a brake disc whose right and left are made of different materials to improve braking characteristics. Specifically, a stainless steel brake disc with excellent initial braking force is arranged on one side, and a carbon fiber brake disc with excellent late braking force is arranged on the other side.

[0005]

However, the double disc brake device causes an increase in weight, resulting in an increase in the rotational moment of the wheel system, which is disadvantageous in terms of braking, unsprung weight, acceleration, and the like. Further, the number of steps and the number of parts for fixing the two brake discs to the hub of the wheel are large, resulting in an increase in cost.

The present invention has been made in consideration of the above-mentioned circumstances, and it is possible to reduce the number of steps without significantly increasing the weight.
It is an object of the present invention to provide a disc brake device for a vehicle that can improve performance by the number of parts.

[0007]

In order to solve the above-mentioned problems, a disk brake device for a vehicle according to the present invention is provided.
As described in claim 1, the brake disc is rotatably and integrally attached to the hub of the wheel pivotally supported on the axle shaft, and the brake disc is sandwiched by the pads provided in the brake caliper from both sides to perform braking. In a vehicle disc brake device, the brake disc is divided into an outer peripheral portion and an inner peripheral portion, and an outer peripheral brake caliper is provided at a position corresponding to the outer peripheral portion of the brake disc.
Also, inner brake calipers are provided at positions corresponding to the inner circumference of the brake disc.

Further, in order to solve the above-mentioned problems, as described in claim 2, the brake disc is divided into an outer peripheral portion and an inner peripheral portion, and the outer peripheral portion and the inner peripheral portion are made of different materials. It was formed from.

[0009]

In the present invention having the above-mentioned structure, the brake disc is attached to the hub of the wheel pivotally supported on the axle shaft so as to rotate integrally, and the brake disc is sandwiched by the pads provided in the brake caliper from both sides to perform braking. The above-mentioned brake disc of the vehicle disc brake device is divided into an outer peripheral portion and an inner peripheral portion, and an outer peripheral brake caliper is provided at a position corresponding to the outer peripheral portion of the brake disc, and also corresponds to the inner peripheral portion of the brake disc. Because the inner brake calipers are installed at the respective positions,
The friction area between the pad and the brake disc is widened, and it is possible to improve the braking performance substantially equivalent to the case where the two brake discs are provided with the weight of one brake disc.

Further, since the brake disc is divided into an outer peripheral portion and an inner peripheral portion, and the outer peripheral portion and the inner peripheral portion are made of different materials from each other, the braking characteristics can be changed, and the braking operation can be changed from the initial stage to the latter stage. Stable braking performance can be obtained throughout.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a right side view of a motorcycle showing an example of a vehicle to which the present invention is applied.

In FIG. 1, the motorcycle 1 has a body frame 2, and an engine 3 is mounted on the lower center of the body frame 2. A fuel tank 4 is provided above the vehicle body frame 2, and an operation seat 5 is provided behind the fuel tank 4.

A swing arm 7 is pivotally mounted on a pivot shaft 6 which is provided at the lower center of the body frame 2 so as to swing around the pivot shaft 6, and a rear wheel 8 is rotatably attached to a rear end of the swing arm 7. Supported.

On the other hand, a head pipe 9 is provided in front of the vehicle body frame 2, and a steering mechanism 10 is provided on the head pipe 9. The steering mechanism 10 is provided with a pair of left and right front forks 13, a front fender 14, a handlebar 15 and the like for rotatably supporting a front wheel 12 of a front wheel 11, and the handlebar 15 rotates the front wheel 11 left and right. Steered freely. A front disc brake device 16 is attached to the front wheel 12.

FIG. 2 is an enlarged side view of the front wheel 11 to which the first embodiment of the present invention is applied, and FIG. 3 is a line III-III of FIG.
It is sectional drawing which follows the line. As shown in FIGS. 2 and 3,
The front wheel 12 has a rim 17, spokes 18,
The axle shaft 21 is pivotally supported by a pair of bearings 20 provided in the hub 19. Both ends of the axle shaft 21 are installed on the lower end of the front fork 13.

One end of a disk hub 22 is fixed to the outer peripheral portion of the hub 19 with, for example, a bolt 23. A front brake disc 24 (hereinafter referred to as a brake disc) of a front disc brake device 16 is fixed to the other end of the disc with, for example, a bolt 25, and the brake disc 24 rotates integrally with the front wheel 12. . The brake disc 24 is made of stainless steel, for example, and is divided into an outer peripheral portion 24a and an inner peripheral portion 24b with the position of the mounting bolt 25 to the disc hub 22 as a boundary.

An outer peripheral brake caliper 26 is provided at a position of the front fork 13 corresponding to the outer peripheral portion 24a of the brake disc 24, and an inner peripheral portion 24b of the brake disc 24.
Inner peripheral brake calipers 27 are respectively provided at positions corresponding to.

The both brake calipers 26 and 27 are, for example, of a general opposed piston type, and pads 28 arranged on both sides of the brake disc 24 are braked by pistons 29 which receive hydraulic pressure from a master cylinder (not shown). The disc 24 is pressed from both sides to exert a braking action.

FIGS. 4A and 4B show the second embodiment of the present invention.
And a brake disc 124 to which the third embodiment is applied,
FIG. 4A is a side view of 224, in which a plurality of holes 130 are formed in the inner peripheral portion 124b of the brake disc 124, for example. Further, FIG. 4B shows, for example, a plurality of slits 231 formed in the inner peripheral portion 224b of the brake disc 224.

FIG. 5 is an enlarged side view of a front wheel 311 to which the fourth embodiment of the present invention is applied, and FIG. 6 is a VI-V of FIG.
It is sectional drawing which follows the I line. As shown in FIGS. 5 and 6, the front wheel 311 shown in the fourth embodiment is substantially the same as the front wheel 11 shown in the first embodiment, but is divided into an outer peripheral portion 24a and an inner peripheral portion 24b. Brake disc 24 is first
In the embodiment, the brake disc 324 in the fourth embodiment is divided into an outer peripheral portion 324a and an inner peripheral portion 324b separately from each other, while the outer peripheral portion 324a is made of a single material such as stainless steel. And the inner circumference 3
The materials of 24b are different from each other. Specifically, for example, the outer peripheral portion 324a is made of stainless steel,
The inner peripheral portion 324b is made of carbon fiber. Then, these outer peripheral portion 324a and inner peripheral portion 324b
Are attached to the disc hub 322 with the same bolts 325. Since the other constituent members are the same as those in the first embodiment, the same reference numerals are given and the description thereof is omitted.

By the way, the brake disc 324 in the fourth embodiment shows an example in which the outer peripheral portion 324a and the inner peripheral portion 324b are attached to the disc hub 322 by the same bolt 325, but FIGS. 7 and 8A are shown. And (b), the outer peripheral portion 424 a and the inner peripheral portion 424 b of the brake disc 424 are separately attached to the disc hub 422 by the bolts 42.
You may attach with 5a, 425b.

Next, the operation of this embodiment will be described.

The brake disc 24 is divided or divided into an outer peripheral portion 24a and an inner peripheral portion 24b, and brake calipers 26 and 27 are arranged on each of the outer peripheral portion 24a and the inner peripheral portion 24b.
The friction area between the brake disc 24 and the brake disc 24 can be widened, and the weight of one brake disc 24 makes the brake disc 24
It is possible to improve the braking performance, which is almost the same as when two brakes are provided. Further, since the weight of the brake disc 24 is reduced, the rotational moment of the wheel system is reduced, which is advantageous in terms of braking, unsprung weight, acceleration, and the like. further,
Brake disc 24 to hub 1 of front wheel 12
The number of steps and the number of parts for fixing to 9 can be reduced as compared with the case where two brake disks 24 are provided.

Further, as shown in the second and third embodiments of the present invention, by forming a plurality of holes 130 and slits 231 on one side of the brake discs 124, 224, for example, the inner peripheral portions 124b, 224b. The outer peripheral portion 124a,
224a exhibits good braking performance in fine weather, and the inner peripheral portions 124b, 224b can exhibit good braking performance in rainy weather. As a result, stable braking performance can be obtained in all weather conditions.

Furthermore, as shown in the fourth embodiment of the present invention, the outer peripheral portion 324a and the inner peripheral portion 324b of the brake disc 324 are made of different materials such as stainless steel having an excellent initial braking force and carbon having an excellent late braking force. If it is formed from fibers, stable braking performance can be obtained from the initial stage of braking to the entire latter period.

Although not described in detail, the pads 28 corresponding to the outer peripheral portion 24a and the inner peripheral portion 24b of the brake disc 24 may be made of different materials. For example, a stainless steel brake disc 2
The braking characteristics can be changed by using a pad 28 made of a sintered material for No. 4 and a pad 28 made of carbon fiber for the brake disc 24 made of carbon fiber.

Although the present invention is applied to the front disc brake device 16 of the motorcycle 1 as described above, the present invention can be applied to other vehicles such as a motorcycle and a four-wheeled vehicle.

[0029]

As described above, according to the disc brake device for a vehicle according to the present invention, the brake disc is rotatably and integrally attached to the hub of the wheel pivotally supported by the axle shaft, and is provided in the brake caliper. In a disc brake device for a vehicle in which the brake disc is sandwiched from both sides by a pad to brake, the brake disc is divided into an outer peripheral portion and an inner peripheral portion, and an outer peripheral brake caliper is positioned at a position corresponding to the outer peripheral portion of the brake disc. Further, since the inner peripheral brake caliper is provided at a position corresponding to the inner peripheral portion of the brake disc, the friction area between the pad and the brake disc is widened,
With the weight of one brake disc, it is possible to achieve substantially the same improvement in braking performance as when two brake discs are provided.

Further, since the brake disc is divided into an outer peripheral portion and an inner peripheral portion and the outer peripheral portion and the inner peripheral portion are made of different materials, it is possible to change the braking characteristic, and it is possible to change the braking characteristic from the initial stage to the latter stage of braking. Stable braking performance can be obtained throughout.

[Brief description of drawings]

FIG. 1 is a left side view of a motorcycle as a vehicle showing an embodiment of a disc brake device for a vehicle according to the present invention.

FIG. 2 is an enlarged side view of a front wheel to which the first embodiment of the invention is applied.

FIG. 3 is a sectional view taken along the line III-III in FIG.

4 (a) and 4 (b) are side views of brake discs to which the second and third embodiments of the present invention are applied.

FIG. 5 is an enlarged side view of a front wheel to which a fourth embodiment of the present invention has been applied.

6 is a sectional view taken along line VI-VI in FIG.

FIG. 7 is a side view showing another embodiment of the method for attaching the brake disc to the disc hub.

8A is a sectional view taken along line AA of FIG.
(B) is sectional drawing which follows the BB line of FIG.

[Explanation of symbols]

 1 Motorcycle 11 Front Wheel 12 Front Wheel 13 Front Fork 16 Front Brake Device 19 Front Wheel Hub 21 Axle Shaft 22 Disc Hub 24 (Front) Brake Disc 24a Brake Disc Outer Edge 24b Brake Disc Inner Edge 26 Outer Brake Caliper 27 Inner circumference brake caliper 28 pad

Claims (2)

[Claims] 1. A disc brake for a vehicle in which a brake disc is rotatably and integrally attached to a hub of a wheel pivotally supported by an axle shaft, and pads provided in a brake caliper sandwich the brake disc from both sides for braking. In the apparatus, the brake disc is divided into an outer peripheral portion and an inner peripheral portion, an outer peripheral brake caliper is provided at a position corresponding to the brake disc outer peripheral portion, and an inner peripheral brake caliper is provided at a position corresponding to the brake disc inner peripheral portion. A disc brake device for a vehicle, characterized in that each of them is provided. 2. The disc brake device for a vehicle according to claim 1, wherein the brake disc is divided into an outer peripheral portion and an inner peripheral portion, and the outer peripheral portion and the inner peripheral portion are made of different materials.