JP3283896B2 - Disc brake device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk brake device used for a vehicle such as an automobile or a motorcycle, and more particularly, to a bracket provided on one side of a brake disk, which is provided in a circumferential direction of the brake disk. A pair of fixing portions fixed to the bracket support member and a pair of supporting portions integrally connected to the fixing portions and straddling the outer peripheral portion of the brake disk, and the supporting portions are opposed to both side surfaces of the brake disk. And a brake caliper connected to a bracket to press the friction pads against both side surfaces of the brake disk while supporting a pair of friction pads slidably in the axial direction of the brake disk.

[0002]

2. Description of the Related Art Such a disk brake device is disclosed in, for example, Japanese Utility Model Laid-Open Publication No. 3-60626.
Already known.

[0003]

The bracket in such a disk brake device is provided with a connecting portion extending in the circumferential direction of the brake disk and protruding from both ends of the connecting portion toward the outside in the radial direction of the brake disk. The bracket is fixed to a bracket support member such as a knuckle with two bolts at both ends of the connecting portion. Therefore, when the braking torque received from the brake disc by the friction pad during braking is supported by the rotationally advancing side of the brake disc, that is, the front support, the support tilts forward about the front bolt. . Then, since the connecting portion integral with the supporting portion is curved in an arc shape radially outward of the brake disc between the two bolts, the rear supporting portion integral with the connecting portion is centered on the rear bolt. Tilt backward. When the front and rear support portions connected to both ends of the connecting portion of the bracket are inclined in a direction away from each other, play is generated in the support of the friction pad slidably guided by the support portions, and the friction pad is loosened. Had the problem of uneven wear.

[0004] The present invention has been made in view of such circumstances, and has as its object to prevent deformation of a bracket due to a load transmitted from a friction pad during braking.

[0005]

In order to achieve the above object, according to the present invention, the bracket is divided between the pair of fixing portions , and each fixing portion is connected to one bolt and a torque receiving surface.
That the bracket is fixed to the bracket support member through
The feature of.

Further, according to the present invention, the bracket is provided with the pair of brackets.
Of each fixed part, and each fixed part is connected with one bolt.
Fixed to the bracket support member via a dowel pin
This is a second feature.

[0007] The present invention, in addition to the first or second aspect described above, the bracket, the third comprising the tie bar for connecting together said pair of supports.

[0008] The present invention, in addition to the first or second aspect described above, a pair of fixing portions of said bracket, said bracket supporting member of the fourth be connected together in a shim for covering the bracket mounting surface of the Features.

[0009]

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 disk brake device, and FIG.
3 is a sectional view taken along line 2-2 in FIG. 1, FIG. 3 is a sectional view taken along line 3-3 in FIG. 2, and FIG. 4 is a perspective view of the bracket.

The knuckle N
A pair of inverted U-shaped support portions 2f, 2r which are spaced apart in the circumferential direction of the brake disk D and straddle the outer peripheral portion of the brake disk D;
On one side of the brake disc D, the support portions 2f, 2
r and a tie bar 4 for integrally connecting the support portions 2f and 2r on the other side of the brake disc D.

A pair of support portions 2f and 2r of the bracket B are respectively engaged with bracket mounting surfaces 5 and 5 recessed above the knuckle N, and the bolts 1 and 2r are inserted into bolt holes formed in the support portions 2f and 2r. 1 is fixed to the knuckle N by screwing. At this time, each of the support 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 disk D.
f, 2r are prevented from rotating around the bolts 1, 1.

The back plates 7 ₁ , 7 ₂ of the pair of friction pads P ₁ , P ₂ disposed on the left and right sides of the brake disc D are provided with shoulders 8 ₁ , 7 at both ends along the circumferential direction of the brake disc D.
8 ₁ ; 8 ₂ , 8 ₂ ; these shoulders 8 ₁ ,
8 ₁ ; 8 ₂ , 8 ₂ are guide grooves 9 of the support portions 2f, 2r;
9 is slidably fitted in the axial direction of the brake disc D via retainers 10 and 10.

The bracket B has two support 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, 1 formed in both support portions 2f, 2r.
3 is slidably fitted. The exposed portions of the sliding pins 11, 11 from the support holes 13, 13 are stretchable dustproof boots 1.
Covered with 4,14.

The brake caliper C is provided so as to straddle the brake disc D with the first and second arms 15 ₁ , 15 ₂ opposed to both sides of the brake disc D with the friction pads P ₁ , P ₂ interposed therebetween. These arms 15 ₁ , 15 ₂
And a bridge portion 16 that integrally connects the spaces, and the bridge portion 16 is provided with a pair of inspection windows 17. 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 vibration of the pad is interposed.

The pair of hydraulic cylinders 19f arranged in the circumferential direction of the brake disc D in the first arm portion 15 ₁ of the brake caliper C, a 19r, the hydraulic cylinder 19f, an input for introducing the output hydraulic pressure of known master cylinder 19r A port 20 is provided, and hydraulic cylinders 19f and 19r are provided with
One friction pad P ₁ of the back plate ₇₁ can push the piston 21f, 21r are fitted slidably. The second arm portion 15 ₂ is in contact in order to push it to the back plate 7 ₂ of the other friction pad P _2.

Next, the operation of this embodiment will be described.

The master cylinder (not shown) is operated by operating the brake pedal, and the output hydraulic pressure is applied to the input port 2.
0 to the hydraulic cylinders 19f and 19r,
The pistons 21f and 21r move forward to move one of the friction pads P
Because pressing the back plate ₇₁ of _1, the friction pad P ₁ supporting portion 2f, and slides the guide grooves 9, 9 2r pressed against the one side of the brake disc D. Then, the reaction force causes the brake caliper C to move in the opposite direction to the forward movement of the pistons 21f, 21r while sliding the sliding pins 11, 11 into the support holes 13, 13 of the support portions 2f, 2r, respectively. 2
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, a braking force is applied to the wheels via the brake disc D.

During the braking, the braking torque acting on the friction pads P ₁ and P ₂ from the brake disk D is supported by the forward supporting portion 2f of the brake disk D in the rotational direction, that is, the front supporting portion 2f, and the braking torque is applied to the front fixed portion. 3f to bolt 1
Try to incline forward with the center as the center. 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 toward the front is very slightly suppressed. Further, the front support portion 2f is connected to the rear support portion 2r by the tie bar 4 which is formed relatively thin and can transmit only tension, so that the braking torque is applied to the rear fixed portion 3r. Bolt 1
The braking torque is also supported by a rear torque receiving surface 6 formed between the rear fixed portion 3r and the knuckle N. As a result, the braking torque is shared by the fixed portions 3f and 3r, and the inclination thereof can be minimized. Moreover, even if the two support portions 2f, 2r are slightly inclined forward by the braking torque, they are inclined in the same direction by the tie bar 4, so that the interval between the guide grooves 9, 9 of the both support portions 2f, 2r may be widened. Therefore, uneven wear of the friction pads P ₁ and P ₂ sliding along the guide grooves 9 and 9 due to rattling can be prevented. Further, since the pair of fixing portions 3f and 3r of the bracket B is divided, the weight of the portion can be reduced, which can 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.

The second embodiment is different from the first embodiment in that, when the pair of fixing portions 3f, 3r of the bracket B are fixed to the knuckle N with the bolts 1, 1, knock pins are used instead of the torque receiving surfaces 6, 6. Has features. That is, each fixed part 3f,
Pin holes 22, 22; 23, 23 are formed on the bracket mounting surfaces 5, 5 of the knuckle N and 3r, respectively, so that the pin holes 22, 22 of the fixing portions 3f, 3r and the pin holes of the knuckle N are formed. 23, 23 and two dowel pins 2
4 are press-fitted at both ends. As a result, the pair of fixing portions 3f, 3r of the bracket B are prevented from rotating with respect to the knuckle N, and the inclination of the two supporting portions 2f, 2r is regulated.

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

The bracket according to the third embodiment does not include the tie bar 4, and instead the front and rear brackets Bf and Br divided into two members are integrally connected by shims 25. The shim 25 is fixed to each bracket B by a pair of gripping claws 26, 26;
The fixing portions 3f and 3r of f and Br are respectively gripped and integrated, thereby facilitating assembly of the brackets Bf and Br to the knuckle N. Front and rear brackets Bf, B
The fixing portions 3f and 3r of r are in contact with the torque receiving surfaces 6 and 6 provided between the knuckle N and the knuckle N, so that the rotation is stopped. The torque receiving surfaces 6, 6 of this embodiment are different from the first embodiment in that the torque receiving surfaces 6, 6 are formed inside the pair of fixing portions 3f, 3r. Formed on the outside.

Fixing portions 3f, 3r of brackets Bf, Br
Is fixed to the bracket mounting surfaces 5 and 5 of the knuckle N, a shim 25 is sandwiched between the fixing portions 3f and 3r and the bracket mounting surfaces 5 and 5. Thereby, the bracket mounting surfaces 5, 5 of the knuckle N are always covered with the shim 25, and when the shim 25 is removed together with the brackets Bf, Br for maintenance, the mud or dust adheres to the bracket mounting surfaces 5, 5 of the knuckle N. Don't be kept clean. Therefore, when attaching the brackets Bf and Br to the knuckle N again, it is possible to prevent mud and dust from biting into their joint surfaces.

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

[0026]

As described above, according to the first and second features of the present invention, a pair of front and rear support portions for supporting the friction pad and the support portion are formed integrally with the support portion. Since the bracket provided with the pair of front and rear fixing portions fixed to the bracket support member is divided between the pair of fixing portions, not only the weight of the bracket is reduced, but also the braking torque from the friction pad during braking is reduced. When the support portion is inclined forward, the braking torque is transmitted to the rear support portion, thereby preventing the support portion from leaning rearward. As a result, it is possible to prevent a gap between the pair of front and rear support portions from being widened, thereby preventing the backing of the brake pad from being rattled, thereby preventing uneven wear of the brake pad.

According to the first feature, since each fixing portion is fixed to the bracket support member via one bolt and the torque receiving surface, the bracket can be supported during braking without impairing the assemblability of the bracket. By reducing the inclination of the portion, the brake pad can be guided in a more stable state.

According to the second feature, in particular , since each fixing portion is fixed to the bracket supporting member via one bolt and a knock pin, the mounting portion of the supporting portion is not damaged at the time of braking without impairing the assemblability of the bracket. By reducing the inclination, the brake pad can be guided in a more stable state.

According to a third feature of the present invention, the bracket is provided with a tie bar for integrally connecting the pair of support portions, so that the front and rear support portions are inclined in the same direction during braking, so that the play of the brake pad is reduced. Can be reduced.

According to the fourth 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 support member, the bracket is integrated and the assembling property is improved. In addition, mud and dust are prevented from adhering to the bracket mounting surface of the bracket support member.

[Brief description of the 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.

FIG. 3 is a sectional view taken along line 3-3 in FIG. 2;

FIG. 4 is a perspective view of a bracket.

FIG. 5 corresponds to FIG. 2 according to a second embodiment.

FIG. 6 is a sectional view taken along line 6-6 in FIG. 5;

FIG. 7 is a view according to a third embodiment and corresponding to FIG. 2;

8 is a sectional view taken along line 8-8 in FIG. 7;

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

[Explanation of symbols]

1 volt 2f supporting portion 2r supporting portion 3f fixing portions 3r fixed portion 4 tie bar 5 bracket mounting surface 6 torque receiving faces 24 knock pin 25 shims 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 (4)

(57) [Claims] 1. A bracket (B, Bf, Br) disposed on one side of a brake disk (D) and fixed to a bracket support member (N) in the circumferential direction of the brake disk (D). A pair of fixing portions (3f, 3r) and a pair of supporting portions (2f, 2r) integrally connected to the fixing portions (3f, 3r) and straddling the outer peripheral portion of the brake disk (D).
r), and a pair of friction pads (P) opposed to both side surfaces of the brake disc (D) are provided on the support portions (2f, 2r).
₁ , P ₂ ) are slidably supported in the axial direction of the brake disc (D), and the friction pads (P ₁ , P ₂ )
P ₂ ) is pressed against brackets (B, Bf, B) by pressing the brake caliper (C) against both side surfaces of the brake disc (D).
In the disc brake device coupled to r), said bracket (B, Bf, Br) the pair of fixing portions and (3f, 3r) divided between its respective fixed portions (3f, 3
r) through one bolt (1) and torque receiving surface (6).
A disk brake device fixed to the bracket support member (N) . 2. A brake disk (D) disposed on one side of the brake disk (D).
Brake brackets (B, Bf, Br)
Bracket support member isolated in the circumferential direction of disc (D)
(N) and a pair of fixing portions (3f, 3r)
These fixed parts (3f, 3r) are connected integrally and brake
A pair of support portions (2f, 2f) straddling the outer peripheral portion of the disk (D)
r), and a brake device is provided on the support portions (2f, 2r).
A pair of friction pads (P) facing both sides of the disc (D)
₁ , P ₂ ) slides in the axial direction of the brake disc (D).
And the friction pad (P ₁ ,
P ₂ ) to press on both sides of the brake disc (D)
Connect the brake caliper (C) to the bracket (B, Bf, B
r), the brackets (B, Bf, Br) are connected to the pair of fixing portions.
(3f, 3r) and each fixed part (3f, 3r)
r), one bolt (1) and dowel pin (24)
Through, characterized in that fixed to said bracket support member (N), the disc brake device. Wherein the bracket (B) is, the pair of supporting portions (2f, 2r) and characterized by comprising a tie bar (4) to be connected together, a disc brake device according to claim 1 or 2, wherein . 4. A pair of fixing portions (3f, 3r) of said brackets (Bf, Br) are integrally connected by a shim (25) covering a bracket mounting surface (5) of said bracket support member (N). 3. The disc brake device according to claim 1, wherein: