JP2559346Y2 - Reaction type 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 reaction type disc brake device used for vehicles such as automobiles and motorcycles, and more particularly to a reaction force type disc brake device provided at both ends of a bracket disposed adjacent to one side of a brake disc. A pair of brakes that integrally form a pair of inverted U-shaped bends that straddle the brake disc and that allow friction pads opposed to both side surfaces of the brake disc to be supported by these bends, and that these friction pads can be pressed against the brake disc. The present invention relates to a caliper in which a pair of sliding pins that are slidably fitted into bag-shaped support holes provided in both bent portions are fixedly provided.

[0002]

2. Description of the Related Art Such a disk brake device is already known, for example, as disclosed in Japanese Utility Model Laid-Open Publication No. 1-113635.

[0003]

In such a disc brake device, the slide pin of the brake caliper and the support hole of the bracket are finished with high precision so as to be slidably fitted to each other without play. In addition, since the support hole is formed in a bag shape, when the sliding pin is fitted into the support hole during assembly, it is difficult to discharge air from the support hole, and the fitting operation is not easy. Grease for lubrication is generally applied to the outer peripheral surface of the sliding pin and the inner peripheral surface of the support hole, so that the grease can discharge air from between the slide pin and the support hole. Making it even more difficult.

Therefore, it is conceivable to make the support hole a through hole in order to smoothly discharge air from the support hole. However, in such a case, after assembly, the open end of the support hole is plugged with a plug or the like to prevent dust. And the structure becomes complicated.

[0005] On the other hand, in such a brake device, the support rigidity of the bracket with respect to the friction pad is increased.
It is also known that free ends of a pair of bent portions formed at both ends of a bracket are integrally connected via a tie bar.

Therefore, according to the present invention, the inner portion of the bag-shaped support hole of the bracket is opened to the outside so that when the sliding pin of the brake caliper is fitted, the air in the support hole is smoothly discharged, and the fitting is performed. It is another object of the present invention to provide the disc brake device which is easy to assemble and has a simple structure, in which a tie bar fixed to a bracket or a fixing member thereof is used to prevent dust in a support hole.

[0007]

In order to achieve the above object, according to the present invention, the free ends of both bent portions of the bracket are provided with screw holes communicating with the support holes, and bolts are screwed into these screw holes. A first feature is that both ends of the tie bar are detachably fixed to the free ends of the both bent portions, so that communication between the support hole and the screw hole is cut off.

Further, according to the present invention, a ventilation hole connected to a support hole is provided at a free end portion of both bent portions of the bracket, and both ends of a tie bar are detachably fixed to the free end portions of both bent portions, and the tie bar is used to fix the both ends. The second feature is to close the ventilation hole.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a disc brake for an automobile will be described below with reference to the drawings. First, the first embodiment of the present invention is started.

1 to 3, a bracket B is provided on one side of a brake disc D which rotates together with the wheels of an automobile.
Are arranged adjacent to each other. The bracket B is fixed to a knuckle (not shown) of a vehicle with bolts 1 (FIG. 2). The bracket B includes a pair of inverted U-shaped members that are separated from each other in the circumferential direction of the brake disk D and straddle the brake disk D. The bent portions 2 and 2 (see FIG. 6) are formed integrally.

A brake caliper C is connected to the bracket B at the bent portions 2 and 2 via a pair of sliding pins 4 and 4 parallel to the axis of the brake disc D. That is, the sliding pins 4 and 4 are fixed to the brake caliper C with the bolts 3 and 3 and slidably fitted into the bag-shaped support holes 5 and 5 formed at the tops of the bent portions 2 and 2. Is done.
The exposed portion of each slide pin 4 from the support hole 5 is covered with an elastic dustproof boot 6. A plurality of vertical grooves 4 a for holding lubricating grease are provided on the outer peripheral surface of each sliding pin 4.

The brake caliper C is provided so as to straddle the brake disc D with first and second arms 7 ₁ and 7 ₂ opposed to both sides of the brake disc D with the friction pads P ₁ and P ₂ interposed therebetween. And a bridge portion 8 for integrally connecting the arms 7 ₁ and 7 _2.
Is provided with an inspection window 9.

[0013] As shown in FIG. 1, the hydraulic cylinder 10 in the first arm portion ₇₁ of the brake caliper C, a input port 11 for introducing the output hydraulic pressure of known master cylinder to the hydraulic cylinder 10 is provided, the piston may press the back plate 12 ₁ of the one friction pad P ₁ to the hydraulic cylinder 10 13
Are slidably fitted. The second arm portion 7 ₂ abuts in order to push it to the back plate 12 ₂ of the other friction pad P _2.

The back plates 12 ₁ , 1 of the friction pads P ₁ , P ₂
2 _2, shoulder 14 ₁ on both ends along the circumferential direction of the brake disc D, 14 _2; 14 _1, 14 ₂ are formed, these shoulders, both bent portions of the bracket B 2, 2
₁ pair of steps 15 ₁ , 15 ₁ ;
5 _2, 15 ₂ is slidably supported in the axial direction of the brake disc D via the wear resistance of the retainer 16, 16.
Stepped portion 15 of the friction pads _{P 1, P 2 1, 15} 1; 1
5 _2, 15 in order to suppress the acting blindly in over _2, the back plate 12 _1,
The pad spring 17 is interposed between the 12 ₂ and the bridge portion 8 of the brake caliper C.

As shown in FIGS. 1 and 3, the bracket B
The free end portions of the bent portions 2, 2, tie bars 18 that bypasses outside the second arm portion 7 ₂ in order to connect them to each other
Are fixed by bolts 19, 19. That is, as shown in FIGS. 3 and 4, each bent portion 2 is provided with a screw hole 20 which is open on the outer surface of the free end portion.
The tie bar 18 is fixed to the bent portion 2 by screwing a bolt 19 passing through the end of the tie bar 18 to 0.

Each of the screw holes 20 communicates with the back of the support hole 5 through a ventilation hole 21.
Is usually closed by a bolt 19 screwed into the screw hole 20.

Next, the operation of this embodiment will be described.

At the time of mounting the brake caliper C to the bracket B, the tie bar 18 is removed from the bracket B in advance so that the back of the
And open to the atmosphere through the screw hole 20. In this state, the slide pin 4 is fitted into the support hole 5. Thus, as the sliding pin 4 is fitted, the air in the support hole 5 is pushed out from the ventilation hole 21 through the screw hole 20 into the atmosphere without difficulty, so that the fitting of the sliding pin 4 is not hindered at all. Therefore, sliding pin 4
Even if grease is applied to the sliding surface of the support hole 5 and the grease prevents the air from being discharged from the insertion hole of the support hole 5, the sliding pin 4 can be fitted without any trouble. .

After the slide pin 4 is fitted, a brake caliper C is fixed to the base end of the slide pin 4 with a bolt 3, and a bolt 19 is screwed into a screw hole 20 of the bent portion 2, and a pair of bent portions 2 is The two are integrally connected. Since the ventilation holes 21 are closed by the bolts 19 screwed into the screw holes 20, external dust passes through the ventilation holes 21 and the support holes 5 are closed.
And the sliding surfaces of the sliding pins 4 and the support holes 5 can always be kept clean.

The master cylinder (not shown) is operated by operating the brake pedal, and the output oil pressure is applied to the input port 1.
1 to the hydraulic cylinder 10, the piston 1
Since 3 presses the back plate 12 ₁ of the one friction pad P ₁ moves forward, the friction pad P ₁ is pressed against the one side of the brake disc D slides on the bent portions 2 of the bracket B . Then, the brake caliper C by reaction force to move in the forward and opposite directions of the piston 13 while sliding Ryosurido pins 4,4 to each support hole 5,5, other by the second arm portion 7 ₂ the back plate 12 _{and second} friction pads P ₂ presses, 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 bent portion 2 of the bracket B on the side of the brake disk D where the brake disk D rotates. Further, since the braking torque is transmitted from the bent portion 2 to the other bent portion 2 via the tie bar 18,
As a result, the braking torque is shared between the two bent portions 2 and 2, and the deformation of the bent portion 2 due to the braking torque can be minimized. FIG. 5 shows a second embodiment of the present invention, in which a ventilation hole 21 is opened on the outer surface on the free end side of each bent portion 2, and this is connected to a tie bar 18 fixed to the bent portion 2 with a bolt 19. It is designed to be closed at the end face. Other configurations are the same as those of the previous embodiment, and the same reference numerals in the drawing denote parts corresponding to those of the previous embodiment.

FIG. 6 shows a third embodiment of the present invention, in which a screw hole 20 into which the fixing bolt 19 of the tie bar 18 is screwed is provided in the bent portion 2 so as to directly communicate with the support hole 5. The configuration is the same as that of the first embodiment except for the above, and in the figure, the portions corresponding to the first embodiment are denoted by the same reference numerals.

According to this embodiment, the air in the support hole 5 can be exhausted without providing the ventilation hole 21 as in the first embodiment, and the structure can be simplified.

[0024]

As described above, according to the present invention, since the inner part of the support hole of the bracket is opened to the outside, when the sliding pin of the brake caliper is inserted into the support hole, the air in the support hole is discharged. And the fitting operation can be easily performed. In addition, after the fitting, the external opening of the support hole is closed by using a tie bar or its fixing bolt, so there is no need to use a plug dedicated for closing, and the dust of the support hole is made simple with a simple structure. Can be achieved.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of a reaction type disc brake device according to a first embodiment of the present invention, which is longitudinally sectioned;

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

FIG. 3 is a perspective view of a bracket and tie bar assembly in FIG. 1;

FIG. 4 is a sectional view taken along line 4-4 in FIG. 3;

FIG. 5 is a sectional view showing a second embodiment of the present invention and corresponding to FIG. 4;

FIG. 6 is a sectional view corresponding to FIG. 4, showing a third embodiment of the present invention;

[Explanation of symbols]

2 bent portions 4 slide pin 5 support hole 18 tie bar 19 bolt 20 threaded hole 21 vents B Bracket C brake caliper P _1, P ₂ friction pads

Claims (2)

(57) [Scope of request for utility model registration] 1. A pair of inverted U-shaped bent portions (2) spaced apart from each other and straddling the brake disc (D) at both ends of a bracket (B) arranged adjacent to one side surface of the brake disc (D). ) formed integrally with the friction pad which faces to both sides of the brake disc (D) (P _1, P ₂₎ is supported on these bent portions (2), these friction pads (P _1,
A pair of brake calipers (C) capable of pressing P ₂ ) against the brake disc (D) have a pair of slidably fitted bag-shaped support holes (5, 5) provided in both bent portions (2). In the reaction type disc brake device in which the sliding pin (4) is fixedly provided, a screw hole (20) communicating with the support hole (5) is provided at the free end of both bent portions (2) of the bracket (B). Both ends of the tie bar (18) are detachably fixed to the free ends of both bent portions (2) by bolts (19) screwed into the screw holes (20), and the support holes (5) and the screw holes ( 20) A reaction type disc brake device, characterized in that communication between them is interrupted. 2. A pair of inverted U-shaped bent portions (2) that are spaced apart from each other and straddle the brake disc (D) at both ends of a bracket (B) arranged adjacent to one side surface of the brake disc (D). ) formed integrally with the friction pad which faces to both sides of the brake disc (D) (P _1, P ₂₎ is supported on these bent portions (2), these friction pads (P _1,
A pair of brake calipers (C) capable of pressing P ₂ ) against the brake disc (D) have a pair of slidably fitted bag-shaped support holes (5, 5) provided in both bent portions (2). In the reaction type disc brake device in which the sliding pin (4) is fixedly provided, a ventilation hole (21) connected to the support hole (5) is provided at the free end of both bent portions (2) of the bracket (B). A reaction force type disc wherein both ends of a tie bar (18) are detachably fixed to the free ends of both bent portions (2), and the ventilation holes (21) are closed by the tie bars (18). Brake device.