JPH08128474A - Brake pad energizing device for disc brake - Google Patents

Abstract

PURPOSE: To simplify the constitution of an urging means for a brake pad for suppressing the instability of the brake power of a disc brake and the squeak of the brake and simplify and facilitate the structure of the device. CONSTITUTION: As for a brake pad energizing mechanism, the rotor turning-IN side R of the brake pad 1 of a disc brake is urged outward in the radial direction by a pad spring 3, and the rotor turning-IN side end 11r of a caliper vibration preventing spring 11 is brought into contact with a fixed member 2. The rotor turning-OUT side end 11t is brought into contact with the radial direction outer surface of the rotor turning-OUT side T of the brake pad 1, and the rotor turning OUT side T of the brake pad 1 is pushed down inwardly in the radial direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake pad urging mechanism for preventing rattling of a brake pad, which eliminates rotation of the pad during braking to stabilize braking force and caliper retainer. By using the spring (caliper vibration prevention spring) also as the pad urging means, the mechanism and structure of the pad urging means can be simplified, and the assembling work of the urging means can be simplified. The cost can be reduced.

[0002]

2. Description of the Related Art Brake pads have left and right ends slidably supported by fixed members, but pad springs 3 urge both ends of the brake pads to prevent rattling of sliding surfaces during braking. It is necessary to eliminate the rattling. A conventional mechanism therefor will be briefly described with reference to FIGS. 2 and 3. Conventionally, both left and right ends of the brake pad 1 are urged radially outward (direction of arrow A) in order to reduce the cost by sharing the left and right pad springs 3 in common. On the other hand, the rotor turn-in side end and the rotor turn-out side end of the caliper vibration prevention leaf spring fixed to the lower surface of the caliper are respectively brought into contact with the rotor turn-in side and rotor turn-out side radial outer surfaces of the brake pad. This urges the caliper outward in the radial direction to prevent its vibration.
The rotor advancing side R and the rotor advancing side T of the brake pad 1 are biased radially inward by a caliper vibration prevention leaf spring, but the biasing force is weaker than the biasing force of the pad spring 3 so that the brake pad 1 is pad spring 3
Are pushed outward in the radial direction by the sliding upper surface s of the brake pad 1 on the rotor turning-in side R and the rotor moving-out side T to be in pressure contact with the guide upper surface g of the fixed member 2. When braking is applied, the brake pad 1 is dragged by the rotor and receives a rotational force M in the same direction as the rotor rotation direction D, and this rotational force M causes the rotor entry side R to move outward in the radial direction, causing the rotor rotation to occur. The outgoing side T tries to move inward in the radial direction (direction of arrow B). However, on the rotor entry side, the pad spring 3
Since the sliding upper surface s is pushed outward in the radial direction by abutment against the guide upper surface g of the fixed member 2, it does not move outward in the radial direction. It moves inward in the radial direction against the pad spring 3 by an amount. Since the brake pad 1 rotates with this movement, the braking surface of the brake pad is pressed against the rotating surface of the rotor while rotating. Therefore,
There is a problem that the braking force is not stable and the brake squeal occurs. In order to solve this problem, the rotor advancing side T of the brake pad is preliminarily biased inward in the radial direction by the pad spring 3, and its sliding lower surface s ₁ is brought into pressure contact with the guide lower surface g ₁ of the fixed member. It is clear from the above phenomenon that it is sufficient, but for that purpose, the left and right pad springs 3 must be different, and the structure of the urging spring on the delivery side must be complicated. The problem remains that the installation becomes considerably troublesome.

[0003]

SUMMARY OF THE INVENTION The present invention is intended to eliminate the instability of the braking force and to eliminate the squeal of the brake. The urging means of the brake pad for that purpose is simplified, and the device is simple and easy. The task is to

[0004]

[Means for Solving the Problems] The measures taken to solve the above problems are constituted by the following elements (a) and (b). (B) The pad spring was used to urge the rotor entry side of the brake pad outward in the radial direction, and (b) the rotor entry side end of the caliper vibration prevention spring was brought into contact with the fixed member, and the rotor entry side end was Is brought into contact with the radially outer surface of the brake pad on the rotor radiating side, and the rotor radiating side of the brake pad is pushed inward in the radial direction.

[0005]

[Operation] Since there is no pad spring on the rotor extension side of the brake pad that urges it outward in the radial direction, the rotor extension side end of the caliper vibration prevention spring (caliper retainer spring) prevents the brake pad from rotating. The exit side is pushed inward in the radial direction, and the sliding lower surface is pressed against the guide lower surface of the fixed member. On the other hand, the rotor entry side of the brake pad is urged radially outward by the pad spring, and the rotor entry side end of the caliper vibration prevention spring is in contact with the fixing member and does not contact the entry side of the brake pad. Since they are not in contact with each other, the rotor entry side of the brake pad is pushed outward in the radial direction by the pad spring, and the sliding upper surface thereof is pressed against the guide upper surface of the fixed member. Therefore, even when the brake pad receives a moment M in the same direction as the rotation direction of the rotor during braking, the brake pad does not rotate together. Then, the rotor entry side of the brake pad is pushed outward in the radial direction by the conventional pad spring,
Since the rotor feed-out side is pushed inward in the radial direction by the caliper vibration prevention spring, the pad spring on the rotor feed-out side of the brake pad is omitted compared to the conventional one, and the caliper vibration prevention spring is replaced by the brake pad. Since it is also used as the rotor urging side biasing means, the mechanism is simpler than the conventional one, and the work of assembling the pad spring is also easier than the conventional one. The caliper vibration prevention spring needs to be changed so that the rotor entry side end of the spring is brought into contact with the fixing member, but the assembling work is the same as in the prior art. Therefore, as a whole, the urging means of the brake pad is simple, and its mounting is simple and easy.

[0006]

[Examples] Although the objects, configurations, and effects of the present invention are apparent from the above description, the essential points of one embodiment will be briefly described with reference to FIG. The disc brake of this embodiment is used for an ordinary passenger car having a rotor diameter of 275 mm and a maximum braking force of 200 kgf · m. The caliper vibration prevention leaf spring (caliper retainer spring) 11 mounted on the radially inner surface of the caliper 10 has its rotor entry side end 11r abutted on the radially outer surface of the fixed member 2,
The turn-out side end 11t is in contact with the radially outer surface of the brake pad 1 on the rotor turn-out side, the urging force F ₁ of the rotor turn-in side end 11r is 1.2 kgf, and the urging force F of the rotor turn-out side end 11t. ₂ is 1.2 kgf. Therefore, the urging force F ₂ is pushed inward in the radial direction by the urging force F ₂ of 1.2 kgf on the rotor advancing side of the brake pad, and the sliding lower surface s ₁ is pressed against the guide lower surface g ₁ of the fixed member 2. A pad spring 3 is provided on the rotor entry side of the brake pad, so that the rotor entry side has an urging force F ₃ of 1.2 k.
is urged radially outward by gf, and its sliding upper surface s
Is pressed against the guide surface g of the fixed member. Therefore, the brake pad 1 is in a state in which it is previously rotated to the state shown in FIG. 3 as compared with the conventional one, and is moved in the axle direction while sliding on the guide surface of the fixing member in this state during braking. . Therefore, the brake pad 1 does not rotate together during braking. The urging force of the caliper vibration-preventing leaf spring at the rotor-outgoing end is a necessary urging force from the viewpoint of preventing the caliper from vibrating and from preventing the brake pad from vibrating vertically due to wheel vibration. Since the specific size depends on the weight of the caliper, the weight of the brake pad, etc., the above-mentioned urging forces F _{1 to} F ₃ are values that should be selected according to the individual disc brakes. Is.

[0007]

[Effect] The invention which solves the above-mentioned problems of the present invention is not yet known. Therefore, it is an effect peculiar to the present invention that the above-mentioned problems are solved and the above-mentioned problems of the prior art are solved. That is, the present invention can prevent the accompanying rotation of the brake pad that occurs during braking due to the rotation of the rotor, and can prevent the unstable braking force and the squeal of the brake that occur as a result of the accompanying rotation. The mechanism of the biasing means for the brake pad for preventing the above can be made simpler than the conventional technique, and the assembling work can be simplified, so that the assembling work can be made efficient. As a means for solving the problem of preventing the brake pad from rotating around, there is one described in Japanese Patent Publication No. 62-3330. It is certain that this one can solve the problem of preventing the above-mentioned turning around, but in contrast to this, the present invention omits the urging means on the rotor squeezing side of the brake pad, and the caliper vibration prevention spring. Since the (caliper pressing spring) is also used as the urging means, the mechanism of the urging means of the brake pad can be simplified and the assembling work can be simplified to improve the efficiency of the work. You can This is a great advantage of the present invention.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a biasing means of a brake pad according to an embodiment of the present invention.

FIG. 2 is a conceptual diagram of a conventional urging means for a brake pad.

FIG. 3 is a conceptual diagram showing a accompanying state during braking of the brake pad of FIG.

[Explanation of symbols]

1 ... Brake pad 2 ... Fixing member 3 ... Pad spring 10 ... Caliper 11 ... Caliper vibration prevention leaf spring 11r ... Caliper vibration prevention leaf spring rotor entry side end 11t ...・ End of the caliper vibration prevention leaf spring on the rotor exit side R ・ ・ ・ Rotor entrance side of the brake pad T ・ ・ ・ Brake pad rotor exit side D ・ ・ ・ Rotor rotation direction M ・ ・ ・ Rotor torque s・ ・ ・ Brake pad sliding upper surface s ₁・ ・ ・ Brake pad sliding lower surface g ・ ・ ・ Fixing member guiding upper surface g ₁・ ・ ・ Fixing member guiding lower surface

Claims (1)

[Claims] Claim: What is claimed is: 1. The right and left ends of the brake pad are slidably supported by a fixing member, and both ends of the brake pad are biased by springs to prevent rattling of the sliding surface during braking. In the brake pad urging mechanism of the lost disc brake, the spring is a pad spring and a caliper vibration prevention spring, and the pad spring urges the rotor entry side of the brake pad outward in the radial direction. Of the brake pad is pressed inward in the radial direction by bringing the end of the rotor inflow side of the brake pad into contact with the fixed member and the end of the rotor outflow side in contact with the radially outer surface of the brake pad in the rotor outflow side. Brake pad biasing mechanism for disc brakes.