JPS6024990Y2 - disc brake device - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a disc that includes a brake disc, a friction pad that faces the side surface of the disc and is provided with a back plate, and a brake caliper that presses the back plate and brings the friction pad into pressure contact with the brake disc. Concerning improvements to brake equipment.

Conventionally, in such brake devices, in order to strengthen the bond between the friction pad and its back plate, it has already been done to fill and bond the material of the friction pad into the spigot hole drilled in the back plate. In this case, in order to further increase the bonding strength, the back plate is made thicker overall and the spigot hole is made deeper, but this inevitably increases the weight of the friction pad assembly.

The present invention was proposed in view of the above-mentioned problems, and includes protruding protrusions on the back surface of the friction pad to form locally thick parts on the back plate.
By drilling a spigot hole deeper than the thickness of the back plate in this thick part and filling and bonding the material of the friction pad into this hole, the friction pad and the back plate can be bonded together with almost no increase in weight. In order to strengthen the connection, and at the same time, use the protrusions mentioned above to suppress the transmission of frictional heat from the friction pad to the brake caliper during braking, and prevent the decrease in rigidity of the brake caliper's clamping arm due to overheating and the paper lock phenomenon. That is.

An example in which the present invention is implemented in an automobile disc device will be described below with reference to the drawings.A bracket B is disposed adjacent to one side of a brake disc D that is connected to a hub of a wheel W and rotates together with the hub of a wheel W. B is fixed to the vehicle body (not shown) using the lower mounting holes 1, 1.

The bracket B has two support arms 2.2 lined up at a constant interval in the rotational direction of the brake disc D, and these arms have inverted U-shaped tips so as to straddle the outer periphery of the brake disc D from left and right. It is bent in a shape (Fig. 4).

Brake discs D are provided on opposing surfaces of these support arms 2, 2.
Two sets of square guide rails 3, 3: 3', 3''
The back plate 4□ of the first friction pad P1, whose front surface faces one side of the brake disc D, is placed between the guide rails 3, 3 of one set, and the guide rail 3' of the other set.
, 3'', a back plate 4° of the second friction pad P2, whose front surface faces the other side of the brake disc D, is installed so as to be slidable in the direction of the rotational axis of the brake disc D, respectively.

The connection structure between the friction pads P and P2 and their back plates 41.4□ will be described later.

The bracket B has a pair of sliding calipers parallel to the rotational axis of the brake disc D, and a brake caliper C made of A1 alloy having first and second pinching arms 51,5 degrees that straddle both friction pads P□, P2. Connect via pin 6.6.

Both sliding pins 6.6 are screwed onto ears 7, 7 protruding from both front and rear ends of the first clamping arm 5□ of the brake caliper C, and are provided on both supporting arms 2, 2 of the bracket B. They are slidably inserted into the support holes 9, 9, respectively.

The first clamping arm 5□ of the brake caliper C is equipped with a known brake mask cylinder (
A cup-shaped piston 11 that presses the back surface of the back plate 41 of the first friction pad P□ is slid onto the hydraulic sill 10 that communicates with the first friction pad P□.

On the other hand, the second pinching arm 5° is branched into a pair of arm pieces 12, 12 spaced apart in the rotational direction of the brake disc D,
These are brought into contact with the 4° rear surface of the back plate of the second friction pad P2.

When mounted on a vehicle, the brake caliper C is housed in the inner space of the wheel W with its second clamping arm 5° positioned on the wheel disc Wa side.

Now, friction pad P1. P2 and their back plates 41°4□
To explain the connection structure with the back plates 41.4°, protrusions 131, 132 are raised on the back surface of each back plate 41.4° by press working to form local thick portions 14, . Forming 14□,
This thick part 14. , 142 has a spigot hole 151 that passes through the thick wall portions 14□, 14° in the axial direction of the brake disc D, and is therefore deeper than the thickness of the back plate 41.4°.
15□ is bored, and the material is filled therein and bonded when forming the friction pads P□ and P2.

In this case, if the stepped holes of the spigot holes 15□ and 15□ are formed as shown in the figure, the anchoring effect of the material of the friction pads P□ and P2 to the back plates 41 and 4° will be good, and the bonding strength between the two will be increased. It will be further strengthened.

The protrusions 131 and 13 degrees are located along the effective diameter line L of the brake disc D (the brake disc D passing through the axis of the piston 11) when the friction pads P□ and P2 are assembled into a brake device.
(a circle on the rotational surface of
A plurality of them are each provided so as to abut on both arm pieces 12 and 12 of the 5° pinching arm.

In this case, the protrusions 13 of both back plates 41 and 42 as in the illustrated example.
．． ．． If the formation positions of 13 degrees coincide with each other, both friction pads P1. It is advantageous to have compatibility with P2.

Thus both friction pads P1. The back plate 4□, 4゜ of P2 is
Those protrusions13. ．． Piston 11 only in 13□
Or, a projection 13. is in contact with the second clamping arm 5°, and a projection 13. ．． A spacing g□, b corresponding to a height of 13° is formed.

Next, the operation of this embodiment will be explained. When hydraulic pressure is applied to the hydraulic cylinder 10 from a mask cylinder (not shown) by pressing the brake pedal, the piston 11, which moves forward due to the hydraulic pressure, presses the protrusion 131 of the back plate 41, causing the piston 11 to move forward. 1 friction pad P1 is pressed against one side of the brake disc D, and at the same time, due to its reaction, the brake caliper C moves in the opposite direction to the piston 11 while sliding the sliding pins 6.6 into the support holes 9, 9. Both arms of the second pinching arm 5° 12° 12
presses the 13° protrusion on the 4° back plate to release the second friction pad P2.
is brought into pressure contact with the other side of the brake disc D.

By the way, since each protrusion 131.13° of the back plate 41, 4□ which is directly pressed by the piston 11 or the arm pieces 12, 12 is arranged along the effective diameter of the brake disc D, as described above, Each friction pad P1. The pressing force of P2 against the brake disc D becomes maximum on its effective radius, and braking force is effectively exerted.

Also, friction pad P1. for braking action. The frictional heat generated at P2 is transferred to the protrusions 13, . 1
3□ makes it possible to suppress conduction to the piston 11 or the second clamping arm 5□.

At the same time, protrusion 13. ．． Back plate 4□ formed by 13°
.

In the gaps g19g2 between the opposing surfaces of the second clamping arm 5□ and the piston 11, an air flow is generated by the action of the running wind that the vehicle receives, and the surroundings thereof can be cooled.

As described above, according to the present invention, a protrusion is raised on the back surface of the back plate of a friction pad to form a locally thick part on the back plate, and the thick part is aligned with the axis of the brake disc. Since a spigot hole penetrating in the direction is drilled and the material of the friction pad is filled and bonded into the spigot hole, the spigot hole can be formed deeper than the thickness of the back plate without increasing the thickness of the entire back plate. It is easily obtained and can increase the bonding strength between the backing plate and the friction pad material without substantially increasing the weight of the friction pad assembly, thus preventing their separation due to braking torque, A lightweight and highly durable friction pad assembly is obtained.

In addition, since the back plate is brought into contact with the pressing part of the brake caliper only at the protrusion, the contact part between the back plate and the caliper pressing part is limited to a small area, and heat conduction from the friction pad to the brake caliper is reduced. can be kept to a minimum.

Moreover, since a gap is formed between the facing surfaces of the back plate and the caliper pressing part, and the air flow passing through the gap can cool the surrounding area, it is possible to prevent the brake caliper from overheating due to braking friction heat. This prevents a decrease in the rigidity of the clamping arm and the paper lock phenomenon, and stabilizes the braking action.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway plan view of one embodiment of the device of the present invention;
, Figures 3 and 4 are n-n, ■-■ and IV of Figure 1.
-IV line sectional view. D...Brake disc, L...Effective diameter line, P□...First friction pad, P2...
...Second friction pad, g1tg2...Gap, 4
1, 4□...Back plate, 52...Second clamping arm as a pressing part, 11...Piston as a pressing part, 13□, 13°...・・・Protrusion, 14 pieces, 1
4゜・・・Thick part, 15. ．． 15□・・・・・・
Spigot hole.

Claims (3)

[Scope of utility model registration request] (1) A disc brake device comprising a brake disc, a friction pad facing the side surface of the brake pad and having a back plate, and a brake caliper that presses the back plate to press the friction pad into contact with the side surface of the brake disc, in which the friction pad A protrusion is raised on the back surface of the back plate to form a locally thick interior in the back plate, and a spigot hole is bored in the thick interior to penetrate the thick part in the axial direction of the brake disc. A disc brake device, wherein a material of the friction pad is filled and bonded therein, and the back plate is brought into contact with a pressing portion of the brake caliper only at the protrusion. (2) The disc brake device according to claim (1), wherein the spigot hole is in the form of a stepped hole. (3) The disc brake device according to claim 1, wherein a plurality of the protrusions are provided on the rear surface of the back plate so as to be arranged substantially along the effective diameter line of the brake disc.