JPH0611362Y2 - Sliding caliper type disc brake for vehicles - Google Patents

Description

Detailed Description of the Invention A. Purpose of the Invention (1) Field of Industrial Use The present invention relates to a sliding caliper type disc brake for a vehicle, in particular, a first caliper arm of a brake caliper is opposed to one side surface of a brake disc, and is also connected to the first scissor arm. The second done
The clamp arm is opposed to the other side surface of the brake disc and is slidably provided on a bracket fixed to the vehicle body through a sliding pin parallel to the rotation axis of the brake disc. The pair of first and second friction pads, which sandwich and face each other, are respectively supported,
The present invention relates to an improvement in which a sandwiching arm is provided with a pushing member that presses the second friction pad, which is respectively supported, against a brake disc during braking.

(2) Conventional technology This type of disc brake uses a second pushing member during braking.
When the friction pad is pressed against one side of the brake disc,
The reaction force causes the brake caliper to slide along the sliding pin so that the first friction pad comes into pressure contact with the other side surface of the brake disc.

In this case, since the conventional disc brake does not include means for returning the brake caliper to the original position before braking after releasing the braking, it is necessary to secure the space between the brake disc and the first friction pad. It relies on the jumping action of the brake disc on the pad.

(3) Problems to be Solved by the Invention However, since the brake caliper does not return to its original position before braking because it relies on the jumping action of the brake disc as described above, the first friction pad Causes abnormal wear in a short time.

The present invention has been made in view of the above circumstances, and an object thereof is to provide the disc brake which can solve the above problem by positively returning the brake caliper to the original position before braking after releasing the braking.

B. Configuration of the Invention (1) Means for Solving the Problems In the present invention, a first clip arm of a brake caliper is made to face one side surface of a brake disc, and a second clip arm connected to the first clip arm is provided. The brake disc is provided slidably on a bracket fixed to the vehicle body via a sliding pin parallel to the other side surface of the brake disc and parallel to the rotation axis of the brake disc, and the brake disc is provided on the first and second sandwiching arms. A vehicle including a pair of first and second friction pads that are sandwiched and opposed to each other, and a push member that causes the second sandwich arm to press the second friction pad supported by the second sandwich pad against the brake disc during braking. In a sliding caliper type disc brake for a vehicle, both ends of a U-shaped return spring made of a spring wire having expansion elasticity are attached to the first pinching arm and the bracket, and an intermediate portion of the return spring is attached. , Characterized in that it engaged with the engaging hole provided in the brake caliper.

(2) Action The brake caliper is stopped in its original position by the expansion elasticity of the return spring while the vehicle is running, and a predetermined gap is formed between the brake disc and the first friction pad.

At the time of braking, the return spring is deformed so as to reduce the distance between both ends of the return caliper as the brake caliper slides, so that the first friction pad can be pressed against the brake disc.

After the brake is released, the return spring is restored by its elasticity, so that the restoring force returns the brake caliper to the original position, thereby forming a predetermined space between the brake disc and the first friction pad.

When the return spring is deformed and restored, the intermediate portion of the return spring is locked by the locking portion of the brake caliper, so that the return spring does not rotate about both ends thereof.

(3) Example The illustrated example shows a sliding caliper type disc brake for a motorcycle as a vehicle. As clearly shown in FIGS. 1 and 3,
The brake disc 1 rotates together with the wheels in the direction of arrow a around the rotation shaft 2, and a bracket 3 is disposed adjacent to one side surface of the brake disc 1 and the bracket 3
Is fixed to the car body.

The brake caliper 4 is provided on the bracket 3 as follows. That is, as clearly shown in FIGS. 2 and 4, the brake caliper 4 is connected to the first pinching arm 51 facing the one side surface of the brake disc ₁ and the first pinching arm 5 _{1 so as} to be connected to the brake disc 1. and a arm 5 ₂ second pinching opposing the other side surface. The first arm 5 ₂ of the pair its second scissors, a second mounting lug 6
And a _{1, 6 2.}

The bracket 3 is provided with a pair of first and second sliding pins 7 ₁ and 7 _{2 which} are parallel to the rotating shaft 2 of the brake disc 1, and each mounting pin 6 _{1 is} attached to each sliding pin 7 ₁ and 7 _2. , 6 ₂ mounting holes 8
₁ , 8 ₂ are slidably fitted. Fourth first sliding pin ₇₁ as best seen in FIG. The sleeve 9, the sleeve 9
Mounting bolt 10 which is threadedly attached to the bracket 3 through
The elastic boots 11 and 12 for protecting the sliding surfaces of the sleeve 9 and the mounting holes 8 ₁ of the first mounting ear 6 ₁ are provided between the both ends of the sleeve 9 and the mounting holes 8 ₁ . Second sliding pin 7
_2, the same reference symbols are affixed to the first slide pin ₇₁ and the same parts from the same configuration as best shown in Figure 2.

A pair of hanger pins 13 is provided between the first and second pinching arms 5 ₁ and 5 _2.
Are erected, and the pair of first. 1st members are connected to the first and second sandwiching arms 5 ₁ and 5 ₂ via the hanger pins 13. Second friction pad 14 ₁ , 1
4 ₂ are respectively supported so as to face each other across the brake disc 1.

The arm 5 ₂ second scissors includes a hydraulic cylinder 15 serving as pressing members, the hydraulic cylinder 15 and the cylinder body 15a which opens toward the ₂ second friction pad 14 slidably fitted in the cylinder body 15a It is composed of a piston 16 which is mounted. The cylinder body 15a communicates with a known brake master cylinder via a hydraulic pressure introduction hole 17.

The piston 16 is opposed to the back surface of the second friction pad 14 _2,
The arms _{5 1} first pinching faces the rear surface of the first friction pad 14 _1.

Between the first scissors arm 5 ₁ and the bracket 3, the spring wire made of U-shaped return spring 18 with enhanced elasticity is provided. Hook-shaped end 2 formed on _one leg 191 of the return spring 18
0 ₁ is engaged with an engagement hole 23 of a projection 22 provided on the end face 21 of the brake disc entry side of the first sandwich arm 5 ₁ ,
The hook-shaped end portion 20 ₂ formed in the other leg 19 ₂ is engaged with the engaging hole 24 of the bracket 3.

As clearly shown in FIGS. 1, 3 and 5, the bent portion 25 between the _two leg portions 19 ₁ and 19 ₂ which is an intermediate portion of the return spring 18 is
Locked to hook locking portion 27 projecting from the first sandwiching the brake disc exit side end surface 26 of the arm 5 _1, thereby arresting the return spring 18 is made.

Thus return reason formed long spring 18 weakens the restoring force by decreasing the spring constant of the return spring 18 is to prevent the second friction pad 14 _{and second} drag against the brake disc 1.

Next, the operation of this embodiment will be described.

While the vehicle is running, the expansion elasticity of the return spring 18 holds the brake caliper 4 in its original position, thereby forming a predetermined space between the brake disc 1 and the first friction pad 14 ₁ .

Therefore, when pressure oil is supplied from the master cylinder to the hydraulic cylinder 15 through the pressure oil insertion hole 17 by operating the brake pedal, the piston 16 moving forward by the hydraulic pressure pushes the _second friction pad 142, and the friction pad 14 moves. ₂ is slid on the hanger pin 13 and pressed onto one side surface of the brake disc 1. Then, due to the reaction force, the brake caliper 4 causes the first and second sliding pins 7 ₁ , 7 ₂ and the mounting holes 8 ₁ ,
Slides in the opposite direction to the piston 16 while applying a slip between the 8 _2, the arm 5 ₁ first scissors first friction pad 14
₁ can be pushed and brought into pressure contact with the other side surface of the brake disc 1, so that the brake disc 1 rotating in the direction of arrow a can be braked.

During this braking, as the brake caliper 4 slides, the return spring 18 is deformed so as to reduce the distance between the _two leg portions 19 ₁ and 19 ₂ , so that the pressure contact of the first friction pad 14 _{1 with} the brake disc 1 is allowed. It

After the brake is released, the return spring 18 is restored by its elasticity, so that the restoring force causes the brake caliper 4 to return to its original position, whereby a predetermined space is formed between the brake disc 1 and the first friction pad 14 _1. It

C. Effect of the Invention According to the present invention, the restoring force of the return spring provided between the first clip arm of the brake caliper and the bracket fixed to the vehicle body returns the brake caliper to the original position before braking after releasing the braking. Therefore, while the vehicle is traveling, a predetermined gap can be formed between the brake disc and the first friction pad to prevent abnormal wear of the first friction pad.

[Brief description of drawings]

The drawings show one embodiment of the present invention. Fig. 1 is a side view of the whole, Fig. 2 is a sectional view taken along the line II-II of Fig. 1, and Fig. 3 is Fig. 2 II.
A view taken in the direction of arrow I, FIG. 4 is a view taken in the direction of arrow IV in FIG. 1, and FIG. 5 is a view in the direction of arrow V in FIG. 1 ... Brake disc, 2 ... Rotation axis, 3 ... Bracket, 4 ... Brake caliper, 5 ₁ , 5 ₂ ...... First,
2nd pinching arm, 14 ₁ , 14 ₂ ... 1st, 2nd friction pad, 15 ... Hydraulic cylinder (pushing member), 18 ... Return spring, 25 ... Bending part (intermediate part), 27 ... ... Locking part

Claims (1)

[Scope of utility model registration request] 1. A brake caliper having a first pinch arm facing one side surface of a brake disc, a second pinch arm continuous with the first pinch arm facing the other side surface of the brake disc, and the brake. A pair of first and second frictions slidably provided on a bracket fixed to the vehicle body through sliding pins parallel to the rotation axis of the disc, and opposed to each other with the brake disc sandwiched between the first and second sandwiching arms. A sliding caliper type disc brake for a vehicle, comprising: a pad supporting member; and a pressing member that presses the second friction pad supported by the pad against the brake disc when braking. Both ends of a U-shaped return spring made of a spring wire having expansion elasticity are attached to the sandwiching arm and the bracket, and an intermediate portion of the return spring is provided on the brake caliper. Vehicle sliding caliper type disc brake, characterized in that engaged in the retaining portion.