JPS5916578Y2 - Vehicle disc brake device - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a disc brake device for vehicles such as automobiles, in particular, a pair of friction pads facing each other with a brake disc sandwiched between them, and a device that allows the friction pads to freely slide in the direction of the rotation axis of the brake disc. The brake caliper includes a fixed bracket for supporting, a first arm portion equipped with a suppressing means such as a piston that presses the back surface of one friction pad, and a second arm portion that contacts the back surface of the other friction pad, The present invention relates to a disc brake device in which a sliding pin, which is fixed to the brake caliper and is parallel to the rotation axis of the brake disc, is slidably fitted into a support hole of a bracket.

Generally, in this type of disc brake device, an elastic bushing is fitted into the support hole of the sliding pin in order to absorb processing errors in various parts and prevent vibration of the brake caliper.
In addition, the exposed sliding surface of the sliding pin is covered with an elastic boot to protect it from dust and the like.

The object of the present invention is to provide a simple and effective structure capable of holding the elastic bushing and the dust-proof boot in place by a single member, the features of which include a tube fitted into the opening of the support hole. One end of the shaped member has an inward flange that abuts against the end of the elastic bushing to prevent the bushing from being pulled out of the support hole, and the other end has a fixed end of the dustproof boot on the bracket side. An outward flange is formed on the outer periphery of the cylindrical member together with the outer surface of the bracket to define an annular mounting groove into which the bracket is fitted.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. The illustrated example is a disc brake device for an automobile, and includes a bracket supporting a brake caliper C on one side of a brake disc D that rotates together with a wheel (not shown). ) Place B adjacently.

This bracket) B is fixed to the vehicle body (not shown) by bolts inserted into the lower mounting holes 1, 1 in FIG.

Bracket B has two arm parts 2, 2 that are lined up at a constant interval in the rotational direction of brake disc D, and the ends of these arms have an inverted U shape so as to straddle the outer circumference of brake disc D from side to side. It's bent.

Brake discs D are provided on opposing surfaces of these arm portions 2, 2.
Two pairs of rectangular guide rails 3, 3; 3', 3 lined up with the
' are integrally protruded, and these support shoulder portions at both ends of respective back metals Pa and P'a of a pair of friction pads P and P' arranged on both sides of the brake disc D.

Furthermore, bag-shaped support holes 4 and 4 are provided at the upper end portions of both arm portions 2 and 2, respectively, and are parallel to the rotation axis of the brake disk D.
' are provided for each.

One support hole 4 is formed to have a larger diameter than the other support hole 4', and an elastic bushing 5 formed from an elastic material such as rubber is fitted into the large diameter support hole 4.

Further, the support holes 4 and 4' have large openings 6.6 and 6.6 having the same diameter.
, and cylindrical members 7, 7 are provided at the openings thereof, respectively.
Press in and secure.

Each cylindrical member 7 has an inward flange 7a formed at its inner end located within the enlarged opening 6, and an outward flange 7b formed at its outer end projecting outside the enlarged opening 6 for support. The inward flange 7a of the cylindrical member 7 on the side of the hole 4 comes into contact with the outer end of the elastic bushing 5 and serves as a retaining member for preventing it from being pulled out from the support hole 4.

On the other hand, between the outward flanges 7b, 7b of both the cylindrical members 7, 7 and the outer surface of the bracket B, annular mounting grooves 9, 9 are provided for respective fixed ends 8a of dustproof boots 8, 8, which will be described later.
form.

Therefore, the two cylindrical members 7, 7 are compatible, and the two members can be used in common.

The brake caliper C has first and second arm portions 10 that straddle both the friction pads P and P on the left and right sides. ．． 10□, the first
The arm portion 10 is formed with a hydraulic cylinder 11 that communicates with a known brake mask cylinder (not shown), and a piston 12 that can press the back surface of the friction pad P is slid therein.

On the other hand, the second arm portion 102 is brought into contact with the back surface of the other friction pad P'.

In addition, the first arm portion 10 has a pair of ear portions 1 at both its front and rear ends.
3.13 are provided protrudingly, and the support holes 4, 4 are connected to these.
Sliding pins 14, 14 parallel to the rotational axis of the brake disc D are screwed together and fixed in correspondence with the rotational axis of the brake disc D.

Then, one sliding pin 14 is slidably fitted into the elastic bushing 5 in the support hole 4, and the other sliding pin 14 is fitted into the support hole 4, respectively.

The sliding surface exposed from each support hole 4, 4' of the sliding pin 14.14 is covered with elastic dust-proof boots 8, 8 made of an elastic material such as rubber, and the bracket l of each dust-proof boot 8 is
- The end on the B side, that is, the fixed end 8a, fits into the mounting groove 9, and the end on the C side of the brake calpa, that is, the movable end 8b, fits in the annular mounting groove 15 formed in the base of each sliding pin 14. be included.

Next, to explain the operation of this embodiment, as shown in FIG. 1, when pressure oil is supplied from the brake mask cylinder to the hydraulic cylinder 11, the piston 12 moves forward due to the oil pressure.
pushes the friction pad P so that it comes into pressure contact with one side of the brake disc D, and at the same time, due to the reaction force, the brake caliper C
However, while sliding the sliding pins 14, 14 along the support holes 4, 4', they move in the opposite direction to the piston 12, and push the friction pad P' with the second arm 10°, thereby releasing the brake disk D. This makes it possible to apply equal frictional braking force to both sides of the brake disk D.

On the other hand, when vibration is applied to the brake caliper C as the vehicle travels, the elastic bushing 5 absorbs the vibration through its elastic deformation, thereby preventing noise generation and damage to the sliding pins 14, 14 due to the vibration of the brake caliper C. This allows stable braking action to be obtained at all times.

Further, the elastic bushing 5 can absorb the distance between the axes of each pair of support holes 4 and 4', the sliding pins 14 and 14, and other machining errors through its elastic deformation.

Incidentally, in the present invention, in order to increase the vibration-proofing effect of the brake caliper C, an elastic bushing may be fitted in the support hole 4' as well as in the other support hole 4.

As described above, according to the present invention, one end of the cylindrical member 7 fitted into the opening 6 of the support hole 4 comes into contact with the end of the elastic bushing 5 to prevent the bushing 5 from coming out of the support hole 4. An inward flange 7a for preventing extraction is provided at the other end, and an annular mounting groove 9 into which the bracket B side fixed end 8a of the dustproof boot 8 is fitted is provided on the outer periphery of the cylindrical member 7 together with the outer surface of the bracket B. Since the outward flanges 7b are formed, one cylindrical member 7 can serve two purposes: to prevent the elastic bushing 5 from coming off and to hold the dustproof boot 8, thereby reducing the number of parts. Furthermore, it is possible to reduce the cost of the device.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway plan view of one embodiment of the device of the present invention;
, 3 and 4 are line II-II in FIG.
-III line and IV-IV line sectional view. 4...Support hole, 5...Elastic bushing,
6... Opening, 7... Cylindrical member, 7a
...Inward flange, 7b...Outward flange, 8...Dust-proof boots, 8a...
・Fixed end, 9...Annular mounting groove, 10□...
...First arm, 10°...Second arm, 12...
...Piston, 14...Sliding pin, B...
...Bracket, C...Brake caliper, D...Brake tooth disk, P...
Friction pad, P'...Friction pad.

Claims (1)

[Scope of utility model registration request] A pair of friction pads P and P' facing each other with a brake disc D in between, a fixed bracket (B) that supports these friction pads P and P' so as to be slidable in the direction of the rotational axis of the brake disc D, and a pair of friction pads It consists of a brake caliper C having a first arm portion 10 equipped with a pressing means such as a piston 12 for pressing the back surface of the pad P, and a second arm portion 10□ that contacts the back surface of the other friction pad P'. A sliding pin 14, which is fixed to the brake caliper C and parallel to the rotation axis of the brake disc D, is slidably fitted into an elastic bushing 5 fitted into the support hole 4 of the bracket B. In a disc brake device in which the exposed sliding surface is covered with a dustproof boot 8, one end of the cylindrical member 7 fitted into the opening 6 of the support hole 4 is provided with a cylindrical member 7 that abuts the end of the elastic bush 5 and is fitted with a dustproof boot 8. An inward flange 7a for preventing the bushing 5 from being pulled out from the support hole 4, and an annular mounting groove 9 for fitting the bracket B side fixed end 8a of the dustproof boot 8 at the other end of the bracket). A vehicular disc brake device comprising an outward flange 7b defined on the outer periphery of the cylindrical member 7 along with an outer surface of the cylindrical member 7.