JPH0542776U - Reaction force type disc brake device - Google Patents

Abstract

(57) [Abstract] [Purpose] Open the inner part of the bag-shaped support hole of the bracket to the outside so that air can be smoothly discharged from the support hole when the sliding pin of the brake caliper is fitted. After fitting, the tie bar fixed to the bracket or its fixing member is used to protect the support hole from dust. [Structure] A tie bar 18 is fixed to the bent portion 2 by a bolt 19 that is screwed into a screw hole 20 provided in the bent portion 2 of the bracket B, and the screw hole 20 is fitted with a sliding pin of a brake caliper. It communicates with the bag-shaped support hole 5 of B through the ventilation hole 21, and this communication hole 21 is connected to the bolt 19
I decided to close it.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a reaction force type disc brake device used in vehicles such as automobiles and motorcycles, and particularly, straddles the brake discs at both ends of a bracket arranged adjacent to one side surface of the brake disc. A pair of inverted U-shaped bends are integrally formed, and friction pads facing both sides of the brake disc are supported by these bends. The brake caliper that can press these friction pads against the brake disc has both bends. The present invention relates to an improvement in which a pair of sliding pins that are slidably fitted in a bag-shaped support hole provided in the section are fixed.

[0002]

[Prior Art]

 Such a disc brake device is already known, for example, as disclosed in Japanese Utility Model Laid-Open No. 1-113635.

[0003]

[Problems to be solved by the device]

 In such disc brake devices, the sliding pins of the brake caliper and the support holes of the brackets are finished with high precision so that they can be slidably fitted together without play, and the support holes are bag-shaped. Therefore, when the sliding pin is inserted into the support hole during assembly, the air in the support hole is difficult to be discharged, and the fitting work is not easy. Since grease for lubrication is generally applied to the outer peripheral surface of the sliding pin and the inner peripheral surface of the support hole, the grease discharges air from between the sliding pin and the support hole. Is becoming more difficult.

Therefore, it is conceivable to use the support hole as a through hole in order to smoothly discharge the air in the support hole, but in this case, after the assembly, the open end of the support hole is plugged to prevent dust. It must be closed due to factors such as the above, which complicates the structure.

On the other hand, in such a braking device, in order to enhance the support rigidity of the bracket with respect to the friction pad, the free ends of the pair of bent portions formed at both ends of the bracket are integrally connected via tie bars. It is also known.

In view of this, the present invention opens the inner part of the bag-shaped support hole of the bracket to the outside so that air can be smoothly discharged from the support hole when the sliding pin of the brake caliper is fitted. It is an object of the present invention to provide the above-mentioned disc brake device which is easy to assemble and has a simple structure in which the tie bar fixed to the bracket or the fixing member thereof is used to protect the support hole from dust after the fitting.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a screw hole communicating with a supporting hole at each free end of each bending portion of a bracket, and a bolt screwed into each of these screw holes connects both ends of the tie bar to each bending portion. The first feature is that it is detachably fixed to the free end to block communication between the support hole and the screw hole.

Further, according to the present invention, the free ends of both the bent portions of the bracket are provided with ventilation holes connected to the support holes, and both ends of the tie bar are detachably fixed to the free ends of the both bent portions. The second feature is that the vent hole is closed by.

[0009]

【Example】

 An embodiment in which the present invention is applied to an automobile disc brake will be described below with reference to the drawings. First, we will start with the first embodiment of the present invention.

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

The 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 which are parallel to the axis of the brake disc D. That is, these sliding pins 4 and 4 are fixed to the brake caliper C with bolts 3 and 3, and are slidable in bag-shaped support holes 5 and 5 formed on the tops of the bent portions 2 and 2. Mated. The exposed portion of each sliding pin 4 from the support hole 5 is covered with an elastic dustproof boot 6. A plurality of vertical grooves 4a for holding lubricating grease are provided on the outer peripheral surface of each sliding pin 4.

The brake caliper C straddles the brake disc D so as to straddle the brake disc D and the first and second arm portions 7 ₁ and 7 ₂ that face each other with the friction pads P ₁ and P ₂ sandwiched therebetween. It is composed of a bridge portion 8 that integrally connects both arm portions 7 ₁ and 7 ₂ , and an inspection window 9 is provided in the bridge portion 8.

[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 13 capable of pressing the back plate 12 _{1 of the one} friction pad P ₁ is slidably fitted into the hydraulic cylinder 10. The second arm portion 7 ₂ abuts against the back plate 12 ₂ of the other friction pad P ₂ to press it.

Shoulders 14 ₁ , 14 ₂ ; 14 ₁ , 14 ₂ are formed at both ends of each of the back plates 12 ₁ , 12 ₂ of the friction pads P ₁ , P ₂ along the circumferential direction of the brake disc D. These shoulders are provided with wear-resistant retainers 16 on a pair of stepped portions 15 ₁ , 15 ₁ ; 15 ₂ , 15 ₂ formed on the facing surfaces of the two bent portions 2, 2 of the bracket B. , 16 is supported slidably in the axial direction of the brake disc D. Between the back plates 1 2 ₁ and 12 ₂ and the bridge portion 8 of the brake caliper C in order to suppress delusions on the stepped portions 15 ₁ and 15 ₁ ; 15 ₂ and 15 _{2 of} these friction pads P ₁ and P _2. A pad spring 17 is interposed in the.

As shown in FIGS. 1 and 3, at the free ends of the two bent portions 2 and 2 of the bracket B, a tie bar 18 that bypasses the outside of the second arm portion 7 ₂ to connect them to each other. Both ends of the are fixed by bolts 19, 19. That is, as shown in FIGS. 3 and 4, each bending portion 2 is provided with a screw hole 20 that opens to the outer surface of the free end thereof, and a bolt 19 that penetrates the end portion of the tie bar 18 is provided in this screw hole 20. The tie bar 18 is fixed to the bent portion 2 by screwing.

Each screw hole 20 communicates with the inner part of the support hole 5 through a vent hole 21, and the vent hole 21 is normally closed by a bolt 19 screwed into the screw hole 20.

Next, the operation of this embodiment will be described.

When assembling the brake caliper C to the bracket B, by removing the tie bar 18 from the bracket B in advance, the inner part of each support hole 5 is opened to the atmosphere through the vent hole 21 and the screw hole 20. I'll do it. In this state, the sliding 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 of the vent hole 21 through the screw hole 20 into the atmosphere without difficulty, so that the fitting of the sliding pin 4 is not hindered. Therefore, even if grease is applied to the sliding surfaces of the sliding pin 4 and the support hole 5 and the grease prevents the discharge of air from the insertion port of the support hole 5, there is no problem in the sliding pin 4 being damaged. Insertion can be performed.

After the sliding pin 4 is fitted, the brake caliper C is fixed to the base end of the sliding pin 4 with the bolt 3, the bolt 19 is screwed into the screw hole 20 of the bending portion 2, and the pair of bending portions 2 are connected with the tie bar 18. , 2 are integrally connected. Since the vent hole 21 is closed by the bolt 19 screwed into the screw hole 20, external dust is prevented from entering the support hole 5 through the vent hole 21, and the sliding pin 4 is prevented. Also, the sliding surface of the support hole 5 can be kept clean at all times.

By operating a master cylinder (not shown) by operating the brake pedal and supplying the output hydraulic pressure to the hydraulic cylinder 10 through the input port 11, the piston 13 moves forward and the back plate 12 _{1 of one} friction pad P ₁ is moved. Since the friction pad P ₁ slides on the bent portions 2 and 2 of the bracket B, the friction pad P ₁ is pressed against 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 piston 13 while sliding the sliding pins 4 and 4 in the support holes 5 and 5, respectively, and the second arm portion 7 ₂ The back plate 12 ₂ of the other friction pad P ₂ is pressed and brought into pressure contact with the other side surface 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 bending portion 2 of the bracket B on the rotation retreating side of the brake disc D. Further, the braking torque is transmitted from the bent portion 2 to the other bent portion 2 through the tie bar 18, so that the braking torque is eventually shared by both bent portions 2 and 2. It is possible to minimize the deformation of the bent portion 2 due to the torque. FIG. 5 shows a second embodiment of the present invention, in which a vent hole 21 is opened on the outer side surface of each bent portion 2 on the free end side, and the vent hole 21 of the tie bar 18 fixed to the bent portion 2 with a bolt 19 is provided. It is designed to be closed at the end face. The other configurations are the same as those in the previous embodiment, and in the figure, parts corresponding to those in the previous embodiment are designated by the same reference numerals.

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. Except for the above, the configuration is the same as that of the first embodiment, and in the figure, portions corresponding to those of the first embodiment are designated by the same reference numerals.

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

[0024]

[Effect of the device]

 As described above, according to the present invention, since the inner portion of the support hole of the bracket is opened to the outside, when the sliding pin of the brake caliper is fitted into the support hole, the air in the support hole is smoothly discharged, The fitting work can be easily performed. Moreover, after the fitting, the external opening of the support hole is closed by using the tie bar or its fixing bolts, so there is no need to use a plug for closing only, and the support hole has a simple structure to prevent dust. Can be planned.

[Brief description of drawings]

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

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

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

4 is a sectional view taken along line 4-4 of FIG.

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

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

[Explanation of symbols]

2 Bent portion 4 Sliding pin 5 Support hole 18 Tie bar 19 Bolt 20 Screw hole 21 Vent hole B Bracket C Brake caliper P ₁ , P ₂ Friction pad

Claims (2)

[Scope of utility model registration request] 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) disposed adjacent to one side surface of the brake disc (D). ) Are integrally formed, and the friction pads (P ₁ , P ₂ ) facing both side surfaces of the brake disc (D) are supported by these bent portions (2), and these friction pads (P ₁ ,
The brake caliper (C) capable of pressing P ₂ ) against the brake disc (D) is slidably fitted into bag-shaped support holes (5, 5) provided in both bent portions (2). In the reaction force 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 ends of both bent portions (2) of the bracket (B). , Both ends of the tie bar (18) are detachably fixed to the free ends of the bent portions (2) by bolts (19) screwed into these screw holes (20), and the support hole (5) and the screw hole ( 20) A reaction force type disc brake device characterized in that communication between them is cut off. 2. 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) disposed adjacent to one side surface of the brake disc (D). ) Are integrally formed, and the friction pads (P ₁ , P ₂ ) facing both side surfaces of the brake disc (D) are supported by these bent portions (2), and these friction pads (P ₁ ,
The brake caliper (C) capable of pressing P ₂ ) against the brake disc (D) is slidably fitted into bag-shaped support holes (5, 5) provided in both bent portions (2). In the reaction force 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 ends of both bent portions (2) of the bracket (B), Both ends of the tie bar (18) are detachably fixed to the free ends of the both bent portions (2), and the ventilation hole (21) is closed by the tie bar (18), which is a reaction force type disc. Brake device.