JPH09133164A - Opposed type disc brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the strength and rigidity of a caliper body and reduce manufacturing cost and weight. SOLUTION: In a knuckle integrated type caliper body 32 of an opposed type disc brake 30, a knucle part 34, an inner caliper body part 38 and an outer caliper body part 40 are integrally formed, so that there is no need to assemble each part with a screw or the like. The inner caliper body part 38 and the outer caliper body part 40 are provided with pistons 46a, 46b, 48a, 48b with brake pads 55, 56 rigidly fixed thereto. A brake disc 76 is rotatably supported to the knuckle part 34, and the brake disc 76 is inserted in a clearance between the brake pads 55, 56.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opposed disc brake used for decelerating and stopping a moving vehicle.

[0002]

2. Description of the Related Art Conventionally, an opposed disc brake has been used to decelerate and stop an automobile. FIG.
As shown in FIG. 1, the opposed disc brake 10 includes an inner caliper body 12 and an outer caliper body 14, and inside each of the caliper bodies 12 and 14, slidable pistons 16a to 16d are provided. A brake pad 18a fixed to the pistons 16a to 16d,
18b, and a brake disc 22 is inserted in the gap between the brake pad 18a and the brake pad 18b.

When manufacturing an automobile, the inner caliper body 12 and the outer caliper body 14 are provided with screws 24a, 24.
The inner caliper body 12 and the outer caliper body 14 are fastened to each other at b by screws to a knuckle (not shown) attached to the vehicle body.

[0004]

However, in the opposed disc brake 10 according to the above-mentioned conventional technique, the caliper body is formed by combining two members, that is, the inner caliper body 12 and the outer caliper body 14. Therefore, each caliper body 12, 14
When manufacturing, the mating surfaces of the inner caliper body 12 and the outer caliper body 14 and the like need to be machined with high precision, which requires a large number of man-hours for processing, resulting in a high manufacturing cost. Further, since the inner caliper body 12 and the outer caliper body 14 are fastened to each other by the screws 24a and 24b, the weight is increased, and the caliper bodies 12, 1
It is difficult to improve the strength and rigidity of screw 4 and screw 2
4a, 24b must be prevented from loosening, and in addition to the caliper bodies 12, 14 described above, the number of necessary parts such as a sealing joint, an unillustrated bolt, etc. is increased, which further increases the manufacturing cost. was there.

Furthermore, since the caliper bodies 12 and 14 are fastened to the knuckle with screws, the loosening of the screws must be prevented as in the above case, which increases the manufacturing cost and the weight of the fastening portions. It has also been pointed out that the vehicle becomes heavier and the vehicle weight increases. The present invention has been made to solve the above problems, and the strength and rigidity of a caliper body are improved, the manufacturing cost can be reduced, and the weight can be further reduced. The purpose is to provide a disc brake.

[0006]

In order to achieve the above object, the present invention provides a knuckle-integrated caliper attached to a vehicle body and integrally formed with a knuckle, an inner caliper body, and an outer caliper body. A body, a spindle rotatably supported by the knuckle-integrated caliper body via bearings, a wheel hub fixed to the spindle, and a wheel and a brake disc fixed to the wheel hub. Characterize.

According to the present invention, when manufacturing an automobile, the knuckle-integrated caliper body is attached to the vehicle body,
Wheels and brake discs are rotatably supported by the knuckle-integrated caliper body. At this time, it is not necessary to fasten the knuckle, the inner caliper body, and the outer caliper body to each other with screws. Moreover, a sealing joint or the like is not necessary.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A facing type disc brake according to the present invention will be described below in detail with reference to the accompanying drawings by way of preferred embodiments. 1 to 4, reference numeral 30 indicates an opposed disc brake according to the present embodiment. The knuckle-integrated caliper body 32 used in the opposed disc brake 30 is integrally formed with a knuckle portion 34 and a caliper body portion 36, and the caliper body portion 36 further includes an inner caliper body portion 38 and an outer caliper body. The body portion 40 is integrally molded. Therefore, the knuckle part 3
4, it is not necessary to assemble the inner caliper body portion 38 and the outer caliper body portion 40.

The caliper body portion 36 is perforated from the inner side to define cylinder holes 41a to 41d. As shown in FIG. 2, the inner side of the cylinder hole 41a defined in the inner caliper body portion 38 is expanded through a step portion 42a, and a sealing member 43 is formed in the step portion 42a.
a is provided. A female screw 44a is screwed on the wall portion of the inner caliper body portion 38 on the opening side of the cylinder hole 41a, and a cylinder cap 45a having a male screw on the outer periphery is screwed into the female screw 44a. In this case, the polygonal tool locking protrusion 47a is formed on the cylinder cap 45a.
Is formed in advance, and a tool (not shown) is locked,
The cylinder cap 45a may be screwed in by rotating the tool. Since the cylinder hole 41b side is also configured in the same manner, the detailed description thereof will be omitted by substituting the reference numeral (a) in FIG. 2 for the reference numeral (a).

The cylinder holes 41a to 41d are shown in FIG.
, Inner pistons 46a facing each other,
46b and outer pistons 48a and 48b are slidably inserted, and piston boots 50a to 50 are attached to the inner pistons 46a and 46b and the outer pistons 48a and 48b.
d, piston seals 52a to 52d are attached.
The inner pistons 46a and 46b, the outer piston 48
Plate-shaped members 54a and 54b are provided on a and 48b, respectively, and an inner brake pad 55 and an outer brake pad 56 are fixed to the plate-shaped members 54a and 54b, respectively.
Reference numeral 57 is a columnar member for preventing the inner brake pad 55 and the outer brake pad 56 from falling off.

The caliper body portion 36 is provided with a cylinder cap 45 forming the cylinder holes 41a and 41b.
a and 45b rear surfaces 58a and 58b and the inner piston 46
The gap between the end portions 59a and 59b of a and 46b, and the end surfaces 58c and 58d that form the cylinder holes 41c and 41d.
And the end portions 59c and 59d of the outer pistons 48a and 48b.
The oil passages 60a and 60b are communicated with the gap between and, and the brake hose 62 is communicated with one end of the oil passage 60a of the inner caliper body portion 38. The brake hose 62 communicates with a brake mechanism (not shown), and brake fluid is supplied from the brake mechanism. The brake mechanism is configured to apply pressure to the brake fluid when the driver operates the brake. The other end of the oil passage 60a is connected to one end of the oil passage 60b of the outer caliper body portion 40 by the oil pipe 6.
4, and an air bleeding valve 66 is provided at the other end of the oil passage 60b. The brake fluid introduced into the cylinder holes 41a to 41d is transferred to the seal member 43a,
43b and the piston seals 52a to 52d prevent the leakage, and the piston boots 50a to 50d prevent foreign matter from entering the parts of the piston seals 52a to 52d.

As shown in FIG. 4, a spindle 70 is rotatably supported by the knuckle portion 34 via a bearing 68, and a wheel hub 72 is fastened to the spindle 70 by a nut 74. A brake disc 76 is fastened to 72 by screws 78. The sliding portions 80a and 80b of the brake disc 76 are provided on the inner brake pad 55 and the outer brake pad 56.
Is inserted in the gap of the sliding portion 8 of the brake disc 76.
A minute gap is provided between 0a and 80b and the inner brake pad 55 and the outer brake pad 56. A wheel 84 is fastened to the wheel hub 72 by a wheel bolt 82. Therefore, the spindle 70, the brake disc 76, and the wheel 84 are integrally rotatably supported by the knuckle portion 34.

The opposed disc brake 30 according to this embodiment is basically constructed as described above, and its operation will be described below. Since the wheel 84 is rotating when the automobile is running, the brake disc 76 is also rotating integrally with the wheel 84. Since the pressure of the brake fluid is not applied to the cylinder holes 41a to 41d when the driver is not operating the brake, the inner pistons 46a and 46b and the outer pistons 48a and 48b are separated from each other, and the inner brake pad 55, the outer brake pad 56 has a slight gap from the sliding portions 80a and 80b of the brake disc 76. Therefore, no braking force is generated and the vehicle does not decelerate.

When the driver operates the brake, pressure is applied to the brake fluid by a brake mechanism (not shown) to introduce the brake fluid into the cylinder holes 41a to 41d, and the inner pistons 46a, 46b and the outer piston 48a,
48b slide toward each other, and the inner brake pad 55 and the outer brake pad 56 are pressed by the sliding portions 80a and 80b of the rotating brake disc 76. Therefore, a frictional resistance is generated between the inner brake pad 55, the outer brake pad 56 and the sliding portions 80a, 80b, and a braking force acts on the brake disc 76 by this frictional resistance, so that the rotation of the wheel 84 becomes slow. The car slows down.

[0015]

According to the opposed disc brake of the present invention, the following effects and advantages can be obtained. Since the knuckle, the inner caliper body, and the outer caliper body are integrally formed in the knuckle-integrated caliper body of the opposed disc brake, the strength and rigidity are improved. Also, knuckle, inner caliper body,
Since it is not necessary to assemble the outer caliper body with screws etc., it is not necessary to process the mating surface of the inner caliper body and the outer caliper body, which can reduce the number of processing steps during manufacturing, and also the sealing joint etc. Since it is unnecessary, the number of parts can be reduced. Therefore, the manufacturing cost can be reduced,
In addition, it is possible to reduce screws etc. as much as possible,
The weight of this type of disc brake can be reduced.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of an opposed disc brake according to an embodiment of the present invention.

FIG. 2 is a partially enlarged vertical sectional view of the opposed disc brake shown in FIG.

[FIG. 3] III- of the opposed disc brake shown in FIG.
FIG. 3 is a sectional view taken along line III.

4 is an IV-I of the opposed disc brake shown in FIG.
It is a V line sectional view.

FIG. 5 is a vertical sectional view of a conventional disc brake according to the related art.

[Explanation of symbols]

30 ... Opposed disc brake 32 ... Knuckle integrated caliper body 34 ... Knuckle part 38 ... Inner caliper body part 40 ... Outer caliper body part 46a, 46b ...
Inner piston 48a, 48b ... Outer piston 55 ... Inner brake pad 56 ... Outer brake pad 70 ... Spindle 72 ... Wheel hub 76 ... Brake disc 84 ... Wheel

Claims (1)

[Claims] 1. A knuckle-integrated caliper body, which is attached to a vehicle body, and in which a knuckle, an inner caliper body, and an outer caliper body are integrally molded, and the knuckle-integrated caliper body is rotatable via a bearing. An opposed disc brake, comprising: a supported spindle; a wheel hub fixed to the spindle; and a wheel and a brake disc fixed to the wheel hub.