JP2559347Y2 - 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 disposed on one side of the brake disk and spaced apart from each other in a circumferential direction of the brake disk. A pair of support parts that straddle the outer periphery of the brake disc are integrally formed, and both ends of the tie bar are screwed into the free ends of both support parts, and bolts inserted through the bolt holes of the tie bar are screwed into the screw holes of the support part. A pair of friction pads facing both sides of the brake disc are slidably supported in the axial direction of the brake disc on the support portion, and the brake calipers are pressed to press these friction pads against both sides of the brake disc. It is connected to a bracket.

[0002]

2. Description of the Related Art Such a disk brake device is already known, for example, as disclosed in Japanese Patent Application Laid-Open No. 53-67065.

[0003]

By the way, the tie bar in such a disc brake device increases the bending rigidity of both support portions of the bracket, and allows the support portion to properly support the braking torque from the friction pad during braking. The tie bar that is bolted to the bracket has the advantage that the support portion of the bracket can be easily cut before the tie bar is joined.

However, in such a disc brake device, conventionally, a gap for absorbing a manufacturing error between the center of the screw hole center of both support portions of the bracket and the center of the bolt hole at both ends of the tie bar is formed in each of the bolt holes and the bolt holes. Since the tie bar and the bracket are provided between the bolts, play may occur at the joint portion between the tie bar and the bracket, and the tie bar may not sufficiently exhibit its reinforcing function.

The present invention has been made in view of such circumstances, and it is possible to absorb a manufacturing error and prevent a play of a connecting portion of a tie bar and a bracket, and a tie bar effectively reinforces a support portion of a bracket. It is an object of the present invention to provide the above-mentioned disc brake device.

[0006]

In order to achieve the above-mentioned object, the present invention provides a bolt hole of a tie bar formed into an elongated hole inclined with respect to a line of action of a force applied from a friction pad to a bracket supporting portion during braking. The first feature is that a peripheral surface of a bolt inserted into the long hole is brought into contact with a flat inner surface facing the long hole.

[0007] In addition to the first feature, the present invention provides a second feature in that pin holes having the same diameter and the same diameter are formed in the tie bar and each support portion, and the pins are press-fitted into the two pin holes. The feature of.

The present invention has a third feature in that, in addition to the first feature, the tie bar and each of the support portions are provided with concave and convex portions which are caulked and fitted to each other.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a disc brake device for an automobile will be described below with reference to the drawings. First, a first embodiment of the present invention shown in FIGS. 1 to 5 is started.

1 and 2, a bracket B is arranged adjacent to one side of a brake disk D which rotates together with the wheels of an automobile. The bracket B is fixed to a knuckle (not shown) of an automobile with bolts 1 (FIG. 2). The support members 2 and 2 are integrally formed, and a pair of friction pads P ₁ and P ₂ opposed to both side surfaces of the brake disk D by these members.
Is supported.

[0011] In other words, the back plate 3 ₁ of the friction pad P _1, P _2,
3 _2, shoulders 4 ₁ at both ends along the circumferential direction of the brake disc D, 4 _1; 4 _2, 4 ₂ provided with a, these shoulders _41, 42 _1; 4 _2, 4 ₂ the supporting part The guide discs 2 and 2 are slidably fitted in the axial direction of the brake disc D via retainers 6 and 6 in the guide grooves 5 and 5 (see FIG. 3).

A brake caliper C is connected to the bracket B via a pair of sliding pins 10, 10 parallel to the axis of the brake disc D at the two support portions 2, 2. That is, these sliding pins 10 and 10 are fixed to the brake caliper C with bolts 11 and 11 and slidably fitted into bag-like supporting holes 12 and 12 formed in both supporting portions 2 and 2. You. The exposed portion of each slide pin 10 from the support hole 12 is covered with an elastic dustproof boot 13.

The brake caliper C is provided so as to straddle the first and second arms 14 ₁ and 14 ₂ opposed to each other on both sides of the brake disc D with the friction pads P ₁ and P ₂ therebetween. And a bridge portion 15 for integrally connecting the arms 14 ₁ and 14 _2. The bridge portion 15 is provided with a pair of inspection windows 16 and 16. Further, the bridge portion 15 and the friction pads P ₁ , P ₂
A pad spring 17 for suppressing vibration of the friction pads P ₁ and P ₂ is interposed between the back plates 3 ₁ and 3 ₂ .

[0014] a pair of hydraulic cylinders 18a arranged in the circumferential direction of the brake disc D in the first arm portion 14 ₁ of the brake caliper C, a 18b, introducing the hydraulic cylinder 18a, the output hydraulic pressure of known master cylinder 18b input A port 19 is provided, and the hydraulic cylinders 18a and 18b have
One friction pad P ₁ of the back plate 3 ₁ may push the pistons 20a, 20b are fitted slidably. The second arm portion 14 ₂ is in contact in order to push it to the back plate 3 ₂ of the other friction pad P _2.

As shown in FIGS. 2 to 5, the free ends of the support portions 2, 2 of the bracket B, which are bent in an inverted U-shape, are connected to the second arm portion 14 ₂ so as to interconnect them. The both ends of the tie bar 9 bypassing the outside of the tie are fixed.

That is, the tie bar 9 is made of a thick steel plate and is separate from the bracket B, and includes a rod portion 21 and mounting pieces 22, 22 bent at both ends of the rod portion 21. . The two mounting pieces 22, 22 are formed with a pair of elongated holes 23, 23 as bolt holes, and a pair of pin holes 24, 24 adjacent thereto. As shown in FIG. 5, the long holes 23 are formed so as to be inclined with respect to the line of action F of the force applied from the friction pads P ₁ and P ₂ to the respective support portions 2 during braking. For example, the pair of elongated holes 23, 23 are formed so as to form a C-shape (see FIG. 2) or an inverted C-shape symmetrical with respect to a radial line of the brake disc D passing through the center therebetween. On the other hand, a pair of screw holes 25, 25 and pin holes 26, 26 corresponding to the elongated holes 23, 23 and the pin holes 24, 24 are provided at the free ends of the support portions 2, 2. Then, the bolt 27 inserted into each long hole 23 is screwed into the screw hole 2.
5, the mounting piece 22 is fastened to the support 2. The bolt 27 has a shaft diameter of the long hole 2 so that the peripheral surface abuts against the flat inner surface of the long hole 23 facing the flat hole.
3 is set substantially equal to the minor axis.

A pin 28 having a head 28a is press-fitted into the pin holes 24 and 26, and the head 28a is pressed against the outer surface of the mounting piece 22.

In this case, the two pin holes 24 and 26 are formed with bolts 27 in order to form them coaxially and with the same diameter with high precision.
In the engaged state of the attachment piece 22 and the support portion 2 by (i.e. Thailand
The bar 9 is attached to both support portions 2 and 2 of the bracket B with bolts 27.
Finished with the same cutting tool ( after fixing) . By doing so, the two pin holes 2 after the finishing process are performed.
Press-fitting of the pins 28 into the pins 4 and 26 can be performed reliably.

Next, the operation of this embodiment will be described.

The master cylinder (not shown) is operated by operating the brake pedal, and the output oil pressure is applied to the input port 1.
9 to the hydraulic cylinders 18a and 18b,
The pistons 20a and 20b move forward to move one of the friction pads P
Because pressing the back plate 3 ₁ of _1, the friction pad P ₁ is the brake disc D slides a guide groove 5, 5 of the support part 2, 2
To one side. Then, due to the reaction force, the brake caliper C causes the sliding pins 10, 10 to slide into the support holes 12
0a, 20b, the second arm 1
4 ₂ by pressing the backing plate 3 ₂ of the other friction pad P _2,
This 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 this braking, the braking torque acting on the friction pads P ₁ and P ₂ from the brake disk D is supported by the support 2 on the brake disk D rotation exit side. Further, the braking torque is transmitted from the supporting portion 2 to the other supporting portion 2 via the tie bar 9, so that the braking torque is eventually shared between the two supporting portions 2 and 2. The deformation of the support portions 2 can be minimized.

By the way, not only the tightening force of the bolt 27 but also the pressing force of the head 28a of the pin 28 against the mounting piece 22 contributes to the tightening of the mounting piece 22 of the tie bar 9 to the support portion 2. The overall tightening force can be obtained.

Incidentally, the assembly process of the disc brake device
Then, as described above, the finish processing of both pin holes 24 and 26
(Accordingly, the pin 28 is pressed into the pin holes 24 and 26).
And attach the tie bar 9 to both support portions 2 and 2 of the bracket B.
The bolt 27 is used for fixing. In this case, each mounting piece 22 of the tie bar 9 is formed with a long hole 23 as a bolt hole through which the bolt 27 is inserted.
Even if the shaft diameter of the bolt 7 is set to be substantially equal to the minor diameter of the long hole 23, and even if there is some manufacturing error in the distance between the centers of the screw holes 25, 25 of the support portions 2, the length of each Insertion into hole 23
The passing position is appropriately moved in the longitudinal direction of the long hole 23 (this movement
Before the pin 28 is pressed into the pin holes 24 and 26.
So that it is not restricted by the pin 28)
This makes it possible to absorb the above-described manufacturing error, whereby the contact state between the peripheral surface of each bolt 27 and both inner side surfaces of the elongated hole 23 can be always maintained . Tooth may, braking smell
Since each of the long holes 23 is inclined with respect to the line of action F of the force applied from the friction pads P ₁ and P ₂ to the support portion 2 due to braking, the support portion 2 and the mounting piece 22 are The transmission of the braking torque through the contact portion of the elongated hole 23 can be accurately performed without play between each other.

At this time, a radial component of the brake disc D is generated at the contact portion between the bolt 27 and the elongated hole 23.
The total tightening force and the mounting piece 2
The pin 28 press-fitted into the pin hole 24 of the support member 2 and the pin hole 26 of the support portion 2 resists the shear stress, and reliably prevents the tie bar 9 from moving.

In this manner, the tie bar 8 always reliably exerts the reinforcing function, and the rigidity of the two support portions 2 can be effectively increased.

FIG. 6 shows a second embodiment of the present invention.
Instead of press-fitting the pins 28 into the pin holes 24 and 26 of the previous embodiment, the protrusions 31 of the mounting pieces 22 of the tie bar 9 are crimped and fitted into the circular recesses 30 of the support portion 2 of the bracket B. That is, when the support portion 2 and the mounting piece 22 are fastened by the bolt 27 (that is, the tie bar 9 is
By caulking the outer surface of the attachment piece 22 and pressing the punch toward the recess 30, the protrusion 31 fitted into the recess 30 is projected from the inner surface of the attachment piece 22 ( after fixing the bolt to the second and second 2). It is a thing.

Other configurations are the same as those of the previous embodiment.
In the figure, portions corresponding to those of the previous embodiment are denoted by the same reference numerals.

In this embodiment, the pin 2 of the previous embodiment is used.
Similarly to 8, the convex portion 31 prevents the tie bar 9 from moving due to the component force.

[0029]

As described above, according to the first feature of the present invention, the bolt hole of the tie bar is formed into a long hole inclined with respect to the line of action of the force applied from the friction pad to the bracket support during braking. Since the peripheral surfaces of the bolts inserted into the elongated holes are brought into contact with the flat inner surfaces of the elongated holes facing each other, manufacturing errors in the center-to-center distances of the screw holes of both support portions are absorbed. Since the long hole of the tie bar and the bolt can always be kept in contact with each other, and the transmission of the braking torque between the support portion and the tie bar can be accurately performed without play, the tie bar bends both support portions. The rigidity can be effectively increased.

According to the second feature of the present invention, pin holes having the same diameter and the same diameter are formed in the tie bar and the respective support portions, and the pins are press-fitted into the both pin holes. Even if a component force in the radial direction of the brake disc is generated at the contact portion between the bolt and the long hole, the shear stress of the pin resists the component force, and the movement of the tie bar due to the component force can be reliably prevented. .

According to the third feature of the present invention, since the tie bar and each support portion are provided with the concave and convex portions which are caulked and fitted to each other, the convex portion has the same function as the pin of the second feature. It is possible to reliably prevent the movement of the tie bar.

[Brief description of the drawings]

FIG. 1 is a plan view of an essential part of a first embodiment of the present invention;

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

FIG. 3 is a perspective view in which a part of an assembly of a bracket and a tie bar is cut away;

FIG. 4 is a sectional view taken along line 4-4 in FIG. 1;

FIG. 5 is a sectional view taken along line 5-5 of FIG. 4;

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

[Explanation of symbols]

2 Supporting part 9 Tie bar 23 Long hole (bolt hole) 24 Pin hole 25 Screw hole 26 Pin hole 27 Bolt 28 Pin 30 Concave part 31 Convex part B Bracket C Brake caliper D Brake disc F Force action line P ₁ , P ₂ Friction pad

Claims (3)

(57) [Scope of request for utility model registration] A bracket (B) arranged on one side of a brake disc (D) is provided with a pair of supports that straddle the outer periphery of the brake disc (D) while being spaced apart from each other in the circumferential direction of the brake disc (D). A bolt (27) in which both ends of the tie bar (9) are inserted into the bolt holes (23) of the tie bar (9) at the free ends of both support portions (2) by integrally forming the portion (2).
Is screwed into the screw hole (25) of the support portion (2) and fastened, and the support portion (2) has a pair of friction pads (P ₁ , P ₂ ) opposed to both side surfaces of the brake disc (D). Are slidably supported in the axial direction of the brake disc (D), and the brake caliper (C) is mounted on the bracket (B) to press these friction pads (P ₁ , P ₂ ) against both side surfaces of the brake disc (D). in the disc brake device coupled to the bolt hole of the tie bar (9), with respect to braking friction pad (P _1, P ₂₎ from acting on the bracket support portion (B) (2) force action line (F) Inclined oblong hole (23)
And a peripheral surface of a bolt (27) inserted into the long hole (23) is brought into contact with a flat inner surface facing the long hole (23). . 2. The tie bar (9) and each of the supporting portions (2) are provided with pin holes (24, 26) having the same diameter and the same diameter, respectively. 24. A disc brake device characterized in that a pin (28) is press-fitted into (24, 26). 3. A disk according to claim 1, wherein the tie bars (9) and the respective support portions (2) are provided with concave and convex portions (30, 31) which are caulked and fitted to each other. Brake device.