JPH06307467A - Split type disc brake device - Google Patents

Abstract

PURPOSE:To reduce the weight of a fixing member which fixes a cylinder side member and a claw side member in a split type disc brake device. CONSTITUTION:Brake pads 12, 13 are mounted, facing the side surface of a disc rotor 11, a cylinder bore 35 where a piston 35a which can slide in the axial direction at the side position of the brake pad 13 is accommodated is formed in a caliper 22 to press the brake pad 12 against the disc rotor 11 through the sliding motion of the piston 35a and the caliper 22 itself. The caliper 22 is constituted so as to fix the a claw side member 44 and a cylinder side member 55. A locking part which receives the force for setting the cylinder side member 55 from the claw side member 44 in the vertical direction to the surface of the disc rotor 11 is mounted onto at least either of the two members to relieve concentrated force which works on a bolt 36. It is thus possible to reduce or eliminate strength necessary for the bolt 36, reducing the weight of the caliper 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a split type disc brake device, and more particularly to a caliper structure thereof.

[0002]

2. Description of the Related Art There are two types of disc brake devices: an integral type in which calipers are integrally formed and a split type in which calipers are divided. As a conventional split type disc brake device, for example, a split type disc brake device disclosed in JP-A-4-54327 can be cited. A conventional split disc brake device will be described below with reference to FIG. The split disc brake device includes a disc rotor 11 that rotates integrally with a wheel (not shown), brake pads 12 and 13 that are provided so as to face a side surface of the disc rotor 11 and are pressed by the disc rotor 11 during braking, and a non-rotating portion of a vehicle body. The caliper 22 is supported in a floating state. The caliper 22 is
For the purpose of using lightweight metal for the cylinder side member 55 that does not require so much strength for vehicle weight reduction, the cylinder side member 55 and the claw side member 44 are divided into two members, and the bolt 36
It is fixed at. A cylinder bore 35 is provided in the divided cylinder side member 55, and a piston 35a is fitted therein. The piston 35a slides in the cylinder bore 35 to the left in FIG. 2 due to the hydraulic pressure generated by the foot brake, so that the brake pad 13 is moved to the disc rotor 1.
Press 1. The brake pad 13 is the disc rotor 1
When pressed by 1, the piston 35a stops sliding.
When the hydraulic pressure further rises, the caliper 22 is moved to the right in FIG. 2 by the hydraulic pressure, and the claw side member 4 in the caliper 22 is moved.
The claw portion 31 provided on the No. 4 presses the brake pad 12 against the disc rotor 11.

[0003]

The split type disc brake device having the above structure has the following problems. When the brake pad 12 is pressed by the disc rotor 11, a reaction force in the left direction in FIG. 2 corresponding to the force by which the brake pad 12 is pressed by the disc rotor 11 is applied to the claw side member 44. As described above, the cylinder side member 55 receives a reaction force in the right direction in FIG. 2 due to the hydraulic pressure generated by the foot brake. That is, in the split type disc brake having the above-mentioned structure, only the bolt 36 receives the force that separates the cylinder side member 55 and the claw side member 44 from each other, which is generated during braking.
Therefore, the strength required for the bolt 36 is high, and there is a problem that the weight of the bolt 36 increases in order to secure the strength of the bolt 36.

According to the present invention, the force required to separate the cylinder side member and the claw side member from each other is received at the joint surface of both members, so that the strength required for the fixing members such as bolts is reduced, and the fixing members such as bolts are lightened. The task is to do.

[0005]

In order to solve the above-mentioned problems, the present invention relates to a split type disc brake in which a caliper is composed of a cylinder side member and a claw side member. It is characterized in that at least one of them is provided with a locking portion for receiving a force of separating the disk rotor surface in the vertical direction.

[0006]

In the present invention constructed as described above, when the pair of brake pads are pressed against the side surface of the disc rotor, the cylinder side member and the claw side member are moved in a direction perpendicular to the disc rotor surface. There is a force to pull them apart.
This force is received by the locking portion provided on at least one of the cylinder side member and the claw side member being locked to the other.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an essential part of a split type disc brake device according to the embodiment. This split type disc brake device is provided with a disc rotor 11 that rotates integrally with a wheel, and brake pads 12 and 13 are arranged so as to face the side surface of the disc rotor 11. The brake pads 12 and 13 are formed of a heat resistant material in an arc shape and are slidably supported in the axial direction of the disc rotor 11 with the disc rotor 11 sandwiched therebetween (not shown). A claw portion 31 is provided on the left side of the brake pad 12 in FIG. 1, and a cylinder portion 34 is provided on the right side of the brake pad 13 in FIG. 1, both of which are connected by a bridge portion 32.

The cylinder portion 34 and the claw portion 31 form a caliper 22 together with a bridge portion 32 that connects the cylinder portion 34 and the pawl portion 31 so as to straddle the disk rotor 11 and are substantially saddle type. The caliper 22 is supported by a non-rotating member (not shown) so as to be floatable by a slide pin (not shown). A cylinder bore 35 is formed in the cylinder portion 34 of the caliper 22, and a piston 35 a is formed inside the cylinder bore 35.
Is slidably fitted. The piston 35a is slid to the left in FIG. 1 when hydraulic pressure is supplied to the cylinder bore 35, and the caliper body 22 is moved to the right in FIG. It is assembled so as to press the rotor 11.

It is assumed that the claw side member 44 having the bridge portion 32 and the claw portion 31 and the cylinder side member 55 including the cylinder portion 34 having the piston 35a are connected by a bolt 36. A substantially hook-shaped engaging portion 33 is provided at the end of the bridge portion 32 of the claw side member 44 (the lower portion of the bridge portion 32 in FIG. 1), and the cylinder portion 34 of the cylinder side member 55 engages with the engaging portion 33. A mating receiving portion 33a is provided, and both are engaged. The outside of the caliper 22 (the upper part in FIG. 1)
Further, the bolt 36 penetrates the cylinder side member 55 and is screwed to the claw side member 44.

The operation of the embodiment configured as described above will be described. When hydraulic pressure is generated in the cylinder portion 34 by depressing a brake pedal (not shown), the piston 3
5a slides to the left in FIG. 1 and presses the brake pad 13 against the disc rotor 11. When the brake pad 13 is pressed by the disc rotor 11, the piston 35a
Stop sliding. Then, when the hydraulic pressure further rises, the caliper 22 moves to the right in FIG. 1, so that the pawl portion presses the brake pad 12 against the disc rotor 11. As a result, the disc rotor 11 is pressed by the brake pads 12 and 13 so as to be sandwiched from both sides, and the rotational force of the wheel is converted into thermal energy by friction to obtain a braking effect.

At this time, when the brake pad 12 is pressed against the disc rotor 11 by the caliper 22, a reaction force is applied to the claw side member 44 in the leftward direction in FIG. 1 corresponds to the pressing force applied to the cylinder side member 55 by being pressed by FIG.
A reaction force is applied in the middle right direction. As a result, the cylinder side member 5
A force for separating the claw-side member 5 and the claw-side member 44 from each other is generated. However, according to the embodiment configured as described above, the force for separating the cylinder side member 55 and the claw side member 44 is received by the bolt 36 that engages the locking portion 33 and the two members, so that the bolt 36 The problem of concentration of force is alleviated, the strength required for the bolt 36 is reduced, and the bolt 36 can be made smaller and lighter. Moreover, in the present embodiment, the presence of the locking portion 33 causes the cylinder side member 55 and the claw side member 4
There is also an effect that the positioning of both when assembling 4 and 4 becomes easy.

Here, the claw side member 44 and the cylinder side member 5
The force that separates 5 and 5 actually acts as a force (hereinafter, referred to as a bending moment) that opens the caliper 22 upward in the drawing. When this bending moment is received by the locking portion 33, the bending moment acts as a compressive load on the caliper 22 above the locking portion 33 in the figure, and the locking portion 33.
The caliper 22 on the lower side in the figure acts as a tensile load. If the area of the portion of the caliper 22 where the bending moment acts as a compressive load is small, the caliper 22 will open upward in the figure during braking, so the piston 35a
Further slides to the brake pad 13 side. Therefore, the stroke of the brake pedal is extended, resulting in a brake feeling with a low sense of rigidity.

In this embodiment, since the engaging portion 33 is provided at the lower end of the claw side member 44 in the figure, the bending moment of the caliper 22 is used as a compressive load as compared with the conventional split disc brake device. The area that can be received is increased. Therefore, the brake feeling is highly rigid.

The locking portion 33 of the above embodiment is not limited to one, but a plurality of locking portions may be provided. Further, the shape of the locking portion 33 is not limited to that shown in FIG. For example, the corner of the locking portion 33 may be dropped to facilitate locking. Also regarding the position where the locking portion 33 is provided, if a force other than the bolt 36 can receive the force of separating the cylinder side member 55 and the claw side member 44 from each other, the joint portion of the cylinder side member 55 and the claw side member 44 can be formed. It is not limited to the inside of the caliper 22 near the disc rotor 11 (the lower side in FIG. 1), and it may be provided at the center of the joint surface or outside the caliper (upper end of the caliper in FIG. 1). In addition, a structure without bolts is also conceivable, and the caliper 22 can be miniaturized by eliminating the bolt screwing part, and the mounting position of the caliper 22 can also be moved to the outer peripheral side of the disc rotor 11, which greatly improves the design freedom such as increasing the disc rotor diameter. It is also possible to have a secondary effect that it will increase.

Further, if the groove width of the portion where the locking portion 33 and the receiving portion 33a are locked becomes wider than the width of the receiving portion 33a due to the component tolerance or the like, the claw side member 44 at the initial stage of braking. Therefore, the force for separating the cylinder side member 55 from each other cannot be received. Therefore, as shown in FIG. 3, by providing the inclined portion 60 on one of the claw side member 44 and the cylinder side member 55, residual bending stress exists in the caliper 22 with the bolt 36 fastened. With such a structure, it is possible to receive a force that separates the claw side member 44 and the cylinder side member 55 from the initial stage of braking.

[0016]

According to the present invention, since the engaging portion provided on the cylinder side member or the claw side member can receive a force for separating the cylinder side member and the claw side member from each other,
A fixing member for fixing the cylinder side member and the claw side member is unnecessary or required strength is reduced, and the caliper can be reduced in weight.

[Brief description of drawings]

FIG. 1 is a sectional view showing a split disc brake device according to an embodiment of the present invention.

FIG. 2 is a sectional view showing an example of a conventional split disc brake device.

FIG. 3 is a cross-sectional view of essential parts of an embodiment in which countermeasures for component tolerances are considered.

[Explanation of symbols]

 11 ... Disc rotor 12, 13 ... Brake pad 35 ... Cylinder bore 35a ... Piston 22 ... Caliper 33 ... Locking part 36 ... Bolt 44 ... Claw side member 55. ..Cylinder side members

Claims (1)

[Claims] 1. A split type disc brake device in which a caliper is composed of a cylinder side member and a claw side member, and at least one of the cylinder side member and the claw side member of the caliper is in a direction perpendicular to a disc rotor sliding surface. A split type disc brake device characterized in that a locking portion for receiving a pulling force is provided on the split type disc brake device.