JPH09257062A - Disc brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent adhesion of abrasion powders of a brake pad to a front surface of a wheel and prevent generation of dusting and rust on the front surface of the wheel by providing a cover which is extended from a caliper mount to a downstream side of a rotational direction of a brake rotor and covers a frictional surface of the brake rotor on the outer direction of the vehicle. SOLUTION: A disc brake for a vehicle is mounted on a hub from an outside of the vehicle at its center portion of a disc-like wheel plate 3, together with a brake rotor 4. A brake caliper 19 is slidably mounted on a caliper mount 13 provided on a nuckle through a slide pin. A cover 22 is installed on a claw 13a on the downstream side of the rotational direction of the brake rotor 4 which is provided on the caliper mount 13. The cover 22 is extended on the downstream side of the rotational direction of the brake rotor 4 from the claw 13a of the caliper mount 13 for suppressing diffusion of abrasion powders, and introducing the powders to outward in an outer diametral direction of the brake rotor 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake device, and more particularly to a brake rotor cover.

[0002]

2. Description of the Related Art In many vehicles such as automobiles and industrial vehicles, wheels for holding tires are equipped with disc brakes. FIG. 6 is a front view showing a conventional wheel.
Further, FIG. 7 is a partial cross-sectional view of the wheel shown in FIG. 6, showing an assembled state of the brake disc. The wheel 1 is formed by an annular rim 2 and a wheel plate 3 that connects the rim 2 and an axle. The brake rotor 4 is arranged in a space surrounded by the rim 2, is bolted to the hub 5 together with the wheel plate 3, and rotates with the wheel 1. In the wheel plate 3, a plurality of through holes 3a are formed side by side in the circumferential direction at a radially intermediate portion thereof. The through hole 3a is located on the side of the brake rotor 4 to reduce the weight of the wheel plate 3 and improve the design, and also serves as a ventilation port so that the air around the brake rotor 4 does not become stagnant. It helps to dissipate heat from the rotor 4. The brake caliper (not shown) is attached to a non-rotating member such as a knuckle, and exerts a braking force by pressing the brake pads arranged on both sides of the brake rotor 4 against the brake rotor 4. The protector 6 is a disk-shaped member attached to the knuckle and protects the brake rotor 4 from flying stones from the road surface.

When a brake caliper (not shown) sandwiches a brake rotor between brake pads to generate a braking force, the brake pads are worn and wear powder is generated. The abrasion powder is subjected to a centrifugal force generated by the rotation of the wheel 1 and the brake rotor 4, and therefore scatters outward in the radial direction of the wheel 1,
A part of it passes through the through hole 3a of the wheel plate 3 and adheres to the front surface of the wheel 1. FIG. 6 shows a state in which the abrasion powder of the brake pad has adhered to the front surface of the wheel.
It adheres only to the outer side in the radial direction and stains the wheel. In particular, when the wheel 1 has a silver-white color due to carved aluminum, or the wheel 1 has a white coating, abrasion powder adheres to the wheel 1 to deteriorate the appearance. Further, since the abrasion powder of the brake pad easily absorbs moisture in the air, only the portion of the front surface of the wheel 1 to which the abrasion powder adheres may be rusted, resulting in a marked deterioration of the appearance.

[0004]

According to the present invention, even with a wheel plate having a through hole, the abrasion powder of the brake pad does not adhere to the front surface of the wheel, and the front surface of the wheel is prevented from becoming dirty or rusted. Provide a disc brake that can

[0005]

To achieve the above object, in the present invention, a wheel having a through hole in a wheel plate, a brake rotor that is adjacent to the inner side of the through hole in the vehicle and rotates with the wheel, and a wheel. A caliper mount attached to a vehicle member that does not rotate together with the caliper mount and a cover that extends downstream from the caliper mount in the brake rotor rotation direction and covers the vehicle outer friction surface of the brake rotor.

[0006]

1 to 5 show an embodiment of the present invention, and FIG. 1 shows an overall view of a disc brake. 2 and 3 show cross sections taken along line II-II and line III-III in FIG. 1, respectively, and FIG. 4 shows a state in which the brake caliper and the cover are disassembled.

A hub 5 is fixed to the axle 7 by spline fitting. A plate-shaped brake rotor 4 is fixed to the hub 5 near the center thereof by a bolt (not shown). A hub bolt 8 and a wheel nut 9 are attached to the hub 5 together with the brake rotor 4 near the center of the disc-shaped wheel plate 3 from the outside of the vehicle. An annular rim 2 supporting the tire 10 is integrally provided on the outer periphery of the wheel plate 3 to form the wheel 1. Further, a plurality of through holes 3a are provided side by side in the circumferential direction at the radial middle portion of the wheel plate 3. Therefore, the brake rotor 4 is arranged adjacent to the vehicle inner side of the through hole 3a of the wheel 1. The suspension mechanism (not shown) only moves up and down with respect to the vehicle body, and is connected to the knuckle 11. A hub 5 is rotatably attached to the knuckle 11 via bearings 12 and 12. Therefore, the axle 7, the hub 5, the brake rotor 4, and the wheel 1 are rotatably attached to the knuckle 12, which is a non-rotating member.

On the other hand, a caliper mount 13 is attached to the knuckle 12 with bolts 14. The caliper mount 13 includes a pair of inverted U-shaped pawls 13a and 13b, and the U-shaped pawls 13a and 13b straddle the brake rotor 4. Each nail 13a, 13b
Is formed with steps 13c and 13c, and a pair of brake pads 15 and 16 arranged on both sides of the brake rotor 4 are provided.
By engaging the projections 15a and 16a of the above, the brake pads 15 and 16 are supported so as not to move in the radial direction and the circumferential direction of the brake rotor 4. The slide pin 1 is attached to the caliper mount 13 by bolts 17 and 17.
8 and 18 are attached, and a brake caliper 19 is slidably attached to the slide pins 18 and 18.

The brake caliper 19 presses the support pawls 19a, 19a for supporting the back surface of one brake pad 16 and the back surface of the other brake pad 15, and is a piston 20 which is fluid-tightly slidable with respect to the brake caliper 19.
It has. It should be noted that the piston 20 has a piston seal 20 for maintaining liquid tightness with the brake caliper 19.
A dust seal 20b for preventing a and dust is attached. When braking hydraulic pressure is applied to the brake caliper 19 from a brake master cylinder (not shown), the piston 20 is pushed toward the brake rotor 4, and the brake caliper 19 receives the reaction force of the piston 20 and moves in the opposite direction. The brake pads 15 and 16 are the brake rotor 4
Braking force is generated by sandwiching.

Of the pair of pawls 13a, 13b provided on the caliper mount 13, the pawl 13a on the downstream side in the rotation direction of the brake rotor 4 is covered by screws 21 and 21 with the cover 2
2 are installed. FIG. 5 is a rear perspective view of the cover 22. The cover 22 is the claw 1 of the caliper mount 13.
3a, it extends to the downstream side in the rotation direction of the brake rotor 4, and is composed of a cover wall 22a, a flange 22b, a peripheral wall 22c, and a tip wall 22d.

The cover wall 22a covers the vehicle outer friction surface 4a of the brake rotor 4 and maintains a gap A with the friction surface 4a. The flange 22b extends from the covering wall 22a toward the vehicle outer friction surface 4a of the brake rotor 4 to a position where it does not contact the friction surface 4a. It is arranged to incline from the inside to the outside. Perimeter wall 22c
Covers the outer peripheral surface of the brake rotor 4 with a gap B maintained, and the width thereof extends from the cover wall 22a to extend inward of the vehicle beyond the brake rotor 4.
Further, the tip wall 22d has a direction substantially perpendicular to the rotation direction of the brake rotor 4, and the cover wall 22a, the flange 22b, and the peripheral wall 22d are respectively in the brake rotor 4d.
Is connected to the downstream end in the rotation direction. Also, the tip wall 2
2d has the same width as the peripheral wall 22c.

Therefore, a passage P is formed around the brake rotor 4 by the cover 22 from the vehicle outer friction surface 4c of the brake rotor 4 to the inside of the vehicle through the outer periphery of the brake rotor 4.

The abrasion powder generated by the friction between the brake rotor 4 and the brake pad 16 rises to the downstream side in the rotation direction of the brake rotor 4, but the downstream side of the brake caliper 19 of the brake rotor 4 is covered by the cover wall 22a of the cover 22. Therefore, the abrasion powder does not reach the through hole 3a of the wheel 1. Further, since the cover 22 is provided with the flange 22b that is inclined outward with respect to the rotation direction of the brake rotor 4, the rising abrasion powder moves in the circumferential direction due to the rotation of the brake rotor 4 and, at the same time, is formed on the flange 22b. Guided along the radial direction of the brake rotor 4. Further, the abrasion powder is guided by the peripheral wall 22c and the tip wall 22d and released toward the inside of the vehicle.

In the present embodiment, the protector 6 attached to the knuckle 12 covers the inside of the vehicle of the brake rotor 4 and protects the brake rotor 4 from flying stones from the road surface. The rotation of the brake rotor 4 causes air to flow outward in the radial direction on both sides of the brake rotor 4.
In order to make the flow of the abrasion powder in (2) smooth, it is preferable that the force of the air flow flowing from the vehicle inner side of the brake rotor 4 into the passage P is weak. Therefore, the gap C between the protector 6 and the brake rotor 4 is made larger than the gap A between the cover wall 22a of the cover 22 and the brake rotor 4, and the cover 2
It is desirable to weaken the air flow in the gap C by extending the width of the second peripheral wall 22c to the position of the protector 6.

In the present embodiment, the caliper mount 13 is attached to the knuckle 12, but there are some vehicles in which the knuckle does not exist due to differences in the vehicle suspension mechanism and drive system. In such a vehicle, the caliper mount 13 may be attached to a vehicle member that does not rotate together with the wheel, such as an axle case. Further, the attachment of the cover 22 to the caliper mount 13 is
The screw 21 is not limited to the screw 21 and can be integrated by welding or casting, or can be attached by using an existing fixing means such as a rivet or a clip.

[0016]

According to the present invention, since the cover 22 is attached to the caliper mount 13, the brake pads 15 and 1 are provided.
Even if 6 is worn, the distance between the brake rotor 4 and the cover 22 does not change. Therefore, the cover 22 can be arranged in the vicinity of the brake rotor 4, so that the rise of abrasion powder is reduced and the brake rotor 4 is prevented.
The abrasion powder can be guided to the outside in the radial direction of the brake rotor 4 by positively utilizing the centrifugal force due to the rotation of the. Also,
Since the brake rotor 4 is arranged adjacent to the through hole 3a of the wheel 1, the brake rotor 4 can sufficiently dissipate heat even during braking, and the braking force does not decrease.

Since the cover 22 is provided with a flange extending toward the friction surface 4c of the brake rotor 4, the gap between the brake rotor 4 and the flange 22b can be further reduced, and the scattering of abrasion powder can be further suppressed. Even if the cover 22 is small, a sufficient effect can be obtained.
Further, since the flange 22b improves the rigidity of the cover wall 22a, a material having low rigidity such as a thin steel plate or synthetic resin can be used, and the cover 22 can be made lightweight.

Further, the flange 22b inclined outward with respect to the rotation direction of the brake rotor 4 and the brake rotor 4
Wall 22c that covers the outer periphery of the cover 22 and the end wall 2 at the tip of the cover 22
Since the passage P is formed between the brake rotor 4 and the cover 22 by 2d, the wear powder of the brake pad 16 is collected in the outer peripheral direction by the rotation of the brake rotor 4, and the collected wear powder is further inside the vehicle, that is, The wheel 1 is guided in the opposite direction to the through hole 3a.

Therefore, in the present invention, it is possible to prevent the abrasion powder of the brake pad 16 from adhering to the front surface of the wheel through the through hole 3a, so that the abrasion powder deteriorates the appearance of the wheel and the abrasion powder absorbs moisture. And the wheel will not rust.

[Brief description of drawings]

FIG. 1 is a perspective view showing a disc brake of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

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

FIG. 4 is an exploded view showing a brake caliper and a cover.

FIG. 5 is a perspective view of a cover.

FIG. 6 is a front view of a wheel that employs a conventional disc brake.

FIG. 7 is a partial cross-sectional view showing a conventional disc brake.

[Explanation of symbols]

 1 Wheel 3 Wheel Plate 3a Through Hole 4 Brake Rotor 12 Knuckle 13 Caliper Mount 22 Cover 22b Flange 22c Peripheral Wall 22d Tip Wall P Passage

Claims (3)

[Claims] 1. A wheel having a through hole in a wheel plate, a brake rotor adjacent to the inner side of the through hole that rotates with the wheel, and a caliper mount attached to a vehicle member that does not rotate with the wheel. A disc brake, comprising: a cover extending from the caliper mount to a downstream side in the rotation direction of the brake rotor and covering a vehicle outer friction surface of the brake rotor. 2. The disc brake according to claim 1, wherein the cover is provided with a flange extending toward the vehicle outer friction surface of the brake rotor. 3. A flange that inclines from the inside to the outside of the brake rotor as it advances in the direction of rotation of the brake rotor,
A passage extending from the outer peripheral surface of the brake rotor to the inside of the vehicle is formed by a peripheral wall that covers the peripheral surface with a gap between the cover and the brake rotor, and a front end wall that extends from the peripheral wall in the peripheral surface direction of the brake rotor. The disc brake according to claim 2.