JPH05248461A - Disc brake device - Google Patents

Abstract

PURPOSE:To prevent a bracket fixed to a knuckle from being deformed by brake torque received from a friction pad and to prevent any uneven wear owing to scattering of the friction pad. CONSTITUTION:A bracket B fixed to a knuckle N by means of two bolts 1 and 1 is provided with a pair of front and rear support parts 2f and 2r slidably guiding friction pads P1 and P2, a pair of front and rear fixing parts 3f and 3r formed integrally with the support parts 2f and 2r and fixed to the knuckle N by means of the bolts 1 and 1, and a tie bar 4 through which the support parts 2f and 2r are interconnected. The bracket B is parted from each other between the two fixing parts 3f and 3r and a detent is formed to the knuckle N by means of torque support surfaces 6 and 6. Since, even when the front support part 2f is inclined frontward by means of brake torque received from the friction pads P1 and P2, since both fixing parts 3f and 3r are parted from each other, the rear support part 2r is prevented from being inclined rearward by means of brake torque.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake device for use in vehicles such as automobiles and motorcycles, and more particularly, to a bracket arranged on one side of a brake disc, which is isolated in the circumferential direction of the brake disc. A pair of fixing portions fixed to the bracket supporting member and a pair of supporting portions that are integrally connected to the fixing portions and straddle the outer peripheral portion of the brake disc. The supporting portions face both side surfaces of the brake disc. The present invention relates to an improvement in which a pair of friction pads are slidably supported in the axial direction of a brake disc, and a brake caliper is connected to a bracket so as to press the friction pads against both sides of the brake disc.

[0002]

2. Description of the Related Art Such a disc brake device is disclosed, for example, in Japanese Utility Model Laid-Open No. 360626/1993.
Already known.

[0003]

By the way, the bracket in such a disc brake device is provided with a connecting portion extending in the circumferential direction of the brake disc, and protruding from both ends of the connecting portion toward the outer side in the radial direction of the brake disc. And a pair of supporting portions for supporting the left and right friction pads, and the bracket is fixed to a bracket supporting member such as a knuckle with two bolts at both ends of the connecting portion. Therefore, when the braking torque that the friction pad receives from the brake disc during braking is supported by the front side support portion in the rotational direction of the brake disc, this support portion tilts forward around the front bolt. .. Then, since the connecting portion integrated with the supporting portion is curved in an arc shape outward in the radial direction of the brake disc between the two bolts, the supporting portion integral with the connecting portion on the rear side is centered on the rear bolt. Tilt backwards. When the front and rear support portions that are continuously provided at both ends of the connecting portion of the bracket incline in such a direction that they are separated from each other, the friction pads supported by the support portions are slidably supported and the friction pads are supported. There was a problem of uneven wear.

The present invention has been made in view of such circumstances, and an object thereof is to prevent the bracket from being deformed by the load transmitted from the friction pad during braking.

[0005]

In order to achieve the above object, the present invention has a first feature that the bracket is divided between the pair of fixing portions.

In addition to the above-mentioned first feature, the present invention also provides:
A second feature is that each of the fixing portions is fixed to the bracket supporting member via one bolt and a torque receiving surface.

In addition to the first feature described above, the present invention also provides
A third feature is that each of the fixing portions is fixed to the bracket support member via one bolt and a knock pin.

In addition to the above first feature, the present invention also provides
A fourth feature is that the bracket includes a tie bar that integrally connects the pair of support portions.

The present invention, in addition to the above-mentioned first feature,
A fifth feature is that the pair of fixing portions of the bracket are integrally connected by a shim covering the bracket mounting surface of the bracket supporting member.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show a first embodiment of the present invention. FIG. 1 is a partial sectional view of a disc brake device, and FIG.
2 is a sectional view taken along line 2-2 of FIG. 1, FIG. 3 is a sectional view taken along line 3-3 of FIG. 2, and FIG. 4 is a perspective view of a bracket.

A bracket B located adjacent to a brake disc D that rotates with the wheels of the vehicle is a knuckle N.
And a pair of inverted U-shaped support portions 2f and 2r which are secured to the outer peripheral portion of the brake disc D by being separated from each other in the circumferential direction of the brake disc D by means of two bolts 1 and 1.
At one side of the brake disc D, the supporting portions 2f, 2
A pair of fixing portions 3f and 3r that are continuously provided below r and a tie bar 4 that integrally connects the supporting portions 2f and 2r on the other side of the brake disc D are provided.

The pair of supporting portions 2f and 2r of the bracket B are engaged with the bracket mounting surfaces 5 and 5 provided in the upper portion of the knuckle N, respectively, and the bolts 1 and 2 are inserted into the bolt holes formed in the supporting portions 2f and 2r. It is fixed to the knuckle N by screwing 1 in. At this time, the supporting portions 2f and 2r and the knuckle N are in close contact with each other on the torque receiving surfaces 6 and 6 extending in the radial direction of the brake disc D, whereby the supporting portion 2f.
The f and 2r are prevented from rotating around the bolts 1 and 1.

Disposed on both the left and right sides of the brake disc D
Pair of friction pads P₁, P₂Back plate 7₁, 7₂Is
Shoulders 8 on both ends of the rake disc D along the circumferential direction.₁，
8₁; 8 ₂, 8₂Equipped with these shoulders 8₁，
8₁; 8₂, 8₂Is a guide groove 9 of the supporting portions 2f, 2r,
9 of the brake disc D via the retainers 10 and 10.
It is fitted so as to be slidable in the axial direction.

The bracket B has two supporting portions 2f, 2
At r, the brake caliper C is connected via a pair of sliding pins 11, 11 parallel to the axis of the brake disc D. That is, these sliding pins 11, 11 are fixed to the brake caliper C with the bolts 12, 12, and
Bag-shaped support holes 13 and 1 formed in both support portions 2f and 2r
3 is slidably fitted. The exposed portions of the sliding pins 11, 11 from the support holes 13, 13 are elastic dustproof boots 1.
Covered with 4,14.

The brake caliper C straddles the brake disc D and the first and second arm portions 15 ₁ and 15 ₂ which are opposed to each other on both sides of the brake disc D with the friction pads P ₁ and P ₂ sandwiched therebetween. These arms 15 ₁ , 15 ₂
And a pair of inspection windows 17 are provided in the bridge portion 16. Further, the bridge portion 16 and the friction pads P ₁ , P
Back plate ₇₁ of the _2, 7 between _two friction pads P _1, P ₂
A pad spring 18 that suppresses the vibration of is interposed.

The first arm portion 15 ₁ of the brake caliper C has a pair of hydraulic cylinders 19f and 19r arranged in the circumferential direction of the brake disc D, and an input for introducing an output hydraulic pressure of a known master cylinder to the hydraulic cylinders 19f and 19r. A port 20 is provided, and the hydraulic cylinders 19f and 19r are provided with
Pistons 21f and 21r capable of pressing the back plate 7 _{1 of one} of the friction pads P ₁ are slidably fitted. The second arm portion 15 ₂ abuts against the back plate 7 ₂ of the other friction pad P ₂ so as to press it.

Next, the operation of this embodiment will be described.

By operating a master cylinder (not shown) by operating the brake pedal, the output hydraulic pressure is input to the input port 2
If it is supplied to the hydraulic cylinders 19f and 19r through 0,
The pistons 21f and 21r move forward to move one friction pad P
_Since the back plate 7 ₁ of ₁ is pressed, the friction pad P ₁ slides in the guide grooves 9, 9 of the supporting portions 2f, 2r and comes into pressure contact with one side surface of the brake disc D. Then, the reaction force causes the brake caliper C to move in the direction opposite to the forward movement of the pistons 21f and 21r while sliding both sliding pins 11 and 11 into the support holes 13 and 13 of the support portions 2f and 2r, respectively. Two
The arm portion 15 ₂ presses the back plate 7 ₂ of the other friction pad P _2, which is pressed against the other side of the brake disc D. Thus, the braking force is applied to the wheels via the brake disc D.

During this braking, the braking torque acting on the friction pads P ₁ and P ₂ from the brake disc D is supported by the front side supporting portion 2f of the brake disc D in the rotational direction, and the braking torque is applied to the front fixing portion. Bolt 3f
It tries to incline to the front side centering on. However, since the rotation of the front fixing portion 3f is restricted by the contact with the front torque receiving surface 6 formed on the knuckle N, the inclination to the front side can be suppressed very slightly. Further, since the front side support portion 2f is connected to the rear side support portion 2r by the tie bar 4 which is formed relatively thin and can transmit only the tension, the braking torque of the rear side fixed portion 3r is increased. Bolt 1
And the braking torque is also supported by the rear torque receiving surface 6 formed between the rear fixing portion 3r and the knuckle N. Eventually, the braking torque is shared by the two fixing portions 3f and 3r, and their inclination can be minimized. Moreover, even if both supporting portions 2f and 2r are slightly inclined forward by the braking torque, they are inclined in the same direction by the tie bar 4, so that the distance between the guide grooves 9 and 9 of both supporting portions 2f and 2r may be increased. It is possible to prevent uneven wear due to rattling of the friction pads P ₁ , P ₂ sliding along the guide grooves 9, 9. Further, since the pair of fixing portions 3f and 3r of the bracket B is divided, it is possible to reduce the weight of that portion and contribute to weight reduction.

5 and 6 show a second embodiment of the present invention. FIG. 5 is a view corresponding to FIG. 2, and FIG. 6 is a sectional view taken along line 6-6 of FIG.

In the second embodiment, when the pair of fixing portions 3f and 3r of the bracket B are fixed to the knuckle N with the bolts 1 and 1, knock pins are used in place of the torque receiving surfaces 6 and 6. It has features. That is, each fixed portion 3f,
Pin holes 22, 22; 23, 23 are formed on the bracket mounting surfaces 5, 5 of the 3r and the knuckle N so as to face each other, and the pin holes 22, 22 of the fixing portions 3f, 3r and the pin hole of the knuckle N are formed. Two knock pins 2 for 23 and 23
Both ends of 4 are press-fitted, respectively. As a result, the pair of fixing portions 3f and 3r of the bracket B are prevented from rotating with respect to the knuckle N, and the inclination of both supporting portions 2f and 2r is restricted.

7 to 9 show a third embodiment of the present invention. FIG. 7 is a view corresponding to FIG. 2, and FIG.
8 is a sectional view taken along line 8 and FIG. 9 is a perspective view of a bracket integrated with a shim.

The bracket of the third embodiment does not include the tie bar 4, but instead, the front and rear brackets Bf and Br which are divided into two members are integrally connected by a shim 25. The shim 25 has a pair of grip claws 26, 26;
The fixing portions 3f and 3r of f and Br are gripped and integrated, respectively, whereby the brackets Bf and Br can be easily assembled to the knuckle N. Front and rear brackets Bf, B
The fixed parts 3f and 3r of r are brought into contact with the torque receiving surfaces 6 and 6 provided between the fixed parts 3f and 3r to prevent rotation. In the torque receiving surfaces 6 and 6 of this embodiment, while the torque receiving surfaces 6 and 6 of the first embodiment are formed inside the pair of fixing portions 3f and 3r, the torque receiving surfaces 6 and 6 of the pair of fixing portions 3f and 3r are formed. Formed on the outside.

Fixed portions 3f, 3r of brackets Bf, Br
When is fixed to the bracket mounting surfaces 5 and 5 of the knuckle N, the shim 25 is sandwiched between the fixing portions 3f and 3r and the bracket mounting surfaces 5 and 5. As a result, the bracket mounting surfaces 5 and 5 of the knuckle N are always covered with the shim 25, and when the shim 25 is removed together with the brackets Bf and Br for maintenance, mud and dust adhere to the bracket mounting surfaces 5 and 5 of the knuckle N. Not kept clean. Therefore, when the brackets Bf and Br are assembled to the knuckle N again, it is possible to prevent mud and dust from being caught in their connecting surfaces.

Although the embodiment of the present invention has been described in detail above, the present invention is not limited to the above embodiment, and various small design changes can be made.

[0027]

As described above, according to the first feature of the present invention, a pair of front and rear supporting portions for supporting the friction pad, and a front and rear pair formed integrally with the supporting portions and fixed to the bracket supporting member. Since the bracket provided with the fixing part is divided between the pair of fixing parts, not only the weight of the bracket is reduced but also the braking torque from the friction pad during the braking makes the front supporting part tilt forward. In this case, the braking torque is transmitted to the rear side support portion, and the rearward inclination of the support portion is prevented. As a result, it is possible to prevent the pair of front and rear support portions from being spaced apart from each other and to prevent the brake pad from being loosened, thereby preventing uneven wear of the brake pad.

Further, according to the second feature of the present invention, since each fixing portion is fixed to the bracket supporting member through one bolt and the torque receiving surface, the braking can be performed without impairing the assembling property of the bracket. At times, the inclination of the support portion can be reduced to guide the brake pad in a more stable state.

Further, according to the third feature of the present invention, since each fixing portion is fixed to the bracket supporting member via one bolt and a knock pin, the bracket is supported during braking without impairing the assembling property of the bracket. By reducing the inclination of the part, the brake pad can be guided in a more stable state.

According to the fourth aspect of the present invention, since the bracket is provided with the tie bar that integrally connects the pair of supporting portions, the front and rear supporting portions are inclined in the same direction during braking, and the rattling of the brake pad is caused. Can be reduced.

According to the fifth aspect of the present invention, since the pair of fixing portions of the bracket are integrally connected by the shim covering the bracket mounting surface of the bracket supporting member, the bracket is integrated and the assembling property is improved. In addition, dirt and dust are prevented from adhering to the bracket mounting surface of the bracket support member.

[Brief description of drawings]

FIG. 1 is a partial sectional view of a disc brake device according to a first embodiment.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is a perspective view of a bracket.

FIG. 5 is a diagram corresponding to FIG. 2 according to the second embodiment.

6 is a sectional view taken along line 6-6 of FIG.

FIG. 7 is a diagram corresponding to FIG. 2 according to a third embodiment.

8 is a sectional view taken along line 8-8 of FIG.

FIG. 9 is a perspective view of a bracket integrated with a shim.

[Explanation of symbols]

1 bolt 2f support part 2r support part 3f fixed part 3r fixed part 4 tie bar 5 bracket mounting surface 6 torque receiving surface 24 knock pin 25 shim B bracket Bf bracket Br bracket C brake caliper D brake disc N knuckle (bracket support member) P ₁ friction Pad P ₂ Friction pad

Claims (5)

[Claims] 1. A bracket (B, Bf, Br) arranged on one side of a brake disc (D) is fixed to a bracket support member (N) while being separated in the circumferential direction of the brake disc (D). And a pair of supporting portions (2f, 2) that are integrally connected to the fixing portions (3f, 3r) and that straddle the outer peripheral portion of the brake disc (D).
r) and a pair of friction pads (P) facing the both side surfaces of the brake disc (D) on the support portion (2f, 2r).
₁ , P ₂ ) are slidably supported in the axial direction of the brake disc (D), and the friction pads (P ₁ ,
The brake caliper (C) is attached to the brackets (B, Bf, B) in order to press P ₂ ) on both sides of the brake disc (D).
In the disc brake device connected to r), the bracket (B, Bf, Br) is divided between the pair of fixing portions (3f, 3r). 2. The fixing parts (3f, 3r) are fixed to the bracket support member (N) through one bolt (1) and a torque receiving surface (6). The disc brake device according to claim 1. 3. The fixing parts (3f, 3r) are fixed to the bracket support member (N) through one bolt (1) and a knock pin (24). 1. The disc brake device according to 1. 4. The disc brake device according to claim 1, wherein the bracket (B) includes a tie bar (4) integrally connecting the pair of support portions (2f, 2r). 5. The pair of fixing portions (3f, 3r) of the bracket (Bf, Br) are integrally connected by a shim (25) covering the bracket mounting surface (5) of the bracket support member (N). The disc brake device according to claim 1, wherein: