JPH1061684A - Disc brake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain weight reduction and cost reduction, and eliminate the occurrence of wrench in an auxiliary pin to slide a caliper by reduction in the number of part items in a slide mechanism. SOLUTION: A slide mechanism 53 to make a caliper 51 movable is composed of a main guide pin 56 and an auxiliary pin 58, and in the auxiliary pin 58, one end part 58a is inserted into a through hole 59 of a calw 8, and engages with an engaging hole 60 formed in a back plate 27 of an outer pad 4, and when the other end part 58b engages with an engaging hole 61 formed in the caliper 51, the caliper 51 is connected to a support 54.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake device for a vehicle, and more particularly to a slide mechanism of a floating caliper type disc brake device for connecting a caliper to a support slidably in an axial direction of a rotor.

[0002]

2. Description of the Related Art As shown in FIGS. 10 and 11, a floating caliper type disk brake device generally has a pair of friction pads 3 and 4 opposed to each other with a rotor 1 interposed therebetween and one friction pad (FIG. 10). A cylinder portion 7 accommodating a piston 5 that presses the inner pad 3 against the rotor 1 is provided at one end and presses the back surface of the other friction pad 4 (sometimes called an outer pad). Caliper 10 with claw 8 on the other end
And the caliper 10 via the slide mechanism 11
And a support 13 slidably supported in the axial direction (the direction of the arrow (a) in FIG. 10). If necessary, a squeal preventing shim 14 (in FIG. 10, disposed only between the outer pad and the claw) is provided between the inner pad 3 and the piston 5 and between the outer pad 4 and the claw 8. Is shown).

[0003] The support 13 has a mounting hole 1 for fixing to a vehicle body.
5 and a supporting arm 18 erected on both sides of the connecting portion 16. On the inner surface of each support arm 18, a pad guide portion 21 is formed so as to support each friction pad 3, 4 movably in the axial direction of the rotor 1 via a pad clip 20 made of sheet metal.

[0004] The piston 5 is operated by hydraulic pressure supplied to the cylinder portion 7 in response to a brake operation, and presses the inner pad 3. The piston 5 is provided with a piston seal 23 and a dust boot 24. The pair of friction pads 3 and 4 include a lining portion 26 that is pressed against the surface of the rotor 1 to generate a predetermined frictional force, and a back metal 27 that is fixedly mounted on the back surface of the lining portion 26 and functions as a mounting bracket or the like. It is composed of

The slide mechanism 11 includes a guide hole 28 formed in the left and right support arms 18 of the support 13 along the axial direction of the rotor 1, a cylindrical rubber bush 30 fitted into each guide hole 28, and Is mounted on a pair of mounting arms 31 penetrating the upper side of the cylinder portion 7 of the caliper 10,
A metal slide pin bolt 33 slidably inserted into the bush 30 is provided. That is, in the slide mechanism 11, the pin portion of the slide pin bolt 33 screwed to the caliper 10 is slidably supported in the guide hole 28 of the support 13 via the bush 30.

In this disc brake device,
When the piston 5 presses the inner pad 3 against the rotor 1 by the brake operation, the caliper 10 slides in the direction opposite to the advance direction of the piston 5, and the claw 8 presses the outer pad 4 against the rotor 1. The pair of friction pads 3 and 4 sandwich the rotor 1 to obtain a braking state.

However, the above-mentioned slide mechanism 11 has a problem that the number of components is large as described above, which leads to weight increase and cost increase. In addition, it takes time and effort to mount the slide pin bolt 33 on the mounting arm 31,
There was also a problem that the assemblability was poor. Furthermore, the contact pressure between the rubber bush 30 and the slide pin bolt 33 fluctuates due to dimensional tolerances and the like, and as a result, the sliding resistance between the slide pin bolt 33 and the bush 30 changes, which is very slight. In addition, there is a possibility that the sliding of the caliper 10 at the time of the brake operation is affected.

[0008] From such a background, there has been proposed a disc brake device in which the above-mentioned slide mechanism is improved.
The disc brake device shown in FIGS. 12 and 13 is described in JP-A-7-139567, in which the caliper 10 is provided with the mounting arm 34 only on one side and the rotor 1 on the other side. V-groove 35 extending along the axial direction of
Equipped. The mounting arm 34 is provided with a main guide pin 36 made of metal.

On the other hand, the support 13 has a main guide pin 36.
A guide hole 28 is provided on one of the support arms 18 through which the V-shaped groove 35 can be inserted. 38 are equipped. The main guide pin 36 is formed by a cylindrical bush 39 fitted in the guide hole 28.
Is slidably supported in the axial direction of the rotor 1, and a resin auxiliary pin 40 is fitted between a pair of opposed V-grooves 35 and locking grooves 38, so that the main guide of the caliper 10 is formed. The rotation around the pin 36 is prevented.

That is, in the embodiment shown in FIGS. 12 and 13, a main guide pin 36 projecting from the caliper 10 and slidably fitted to the support 13 side, a pair of opposed V grooves 35 and a locking groove 38 are provided. With the auxiliary pin 40 fitted in between,
The caliper 10 is slidably connected to the support 13.

[0011]

FIG. 12 and FIG.
In the slide mechanism shown in FIG.
Since the use of the bush, which may affect the sliding operation of the caliper 10, is reduced to one, the reliability of the movement of the caliper 10 is improved by that much, and the metal is relatively heavy. Since the use of a main guide pin having a small number of pins is reduced to one, it is possible to expect a reduction in weight and improvement in assemblability. However, since it takes time to process the V-groove 35 and the locking groove 38 formed in the caliper 10 and the support 13, it is costly.
There was a risk that it would be even more disadvantageous than the previous one. In addition, due to dimensional tolerances and the effect of braking torque acting during braking,
There is a possibility that a stick (twist) occurs in the auxiliary pin 40, which may hinder the subsequent sliding operation of the caliper 10.

The present invention has been made in view of the above circumstances, and achieves weight reduction and cost reduction by reducing the number of parts in a slide mechanism, as well as good assemblability.
Furthermore, the disc brake device maintains the smooth movement of the caliper during the brake operation for a long period of time without causing twisting of the slide auxiliary pin due to dimensional tolerances and braking torque acting during braking. The purpose is to provide.

[0013]

According to the present invention, there is provided a disk brake device comprising: a pair of friction pads arranged to face each other with a rotor interposed therebetween; A caliper equipped at one end with a piston for pressing against the back of the other friction pad and a support for supporting the caliper slidably in the axial direction of the rotor via a slide mechanism. A floating caliper type disc brake device, wherein the caliper slides by a reaction force of pressing the piston against one of the friction pads against the rotor, and the pawl presses the other friction pad against the rotor, The slide mechanism enables one side of the caliper to rotate with respect to the support. A first guide pin movably connected in the axial direction of the rotor, and a rotation of the caliper about the first guide pin as a rotation center, and a movement of the caliper in the axial direction of the rotor. A second guide pin for connecting the other side to the support, wherein the second guide pin has one end engaged with the claw and the other end engaged with an appropriate position on the caliper remote from the claw. Portion and is fixed to the outer surface of the caliper, and the one end is inserted into a through hole formed in the claw, and is engaged with an engagement hole formed in a back metal of the other friction pad. ,
The caliper is connected to the support via the other friction pad.

Since the disc brake device of the present invention comprises the first guide pin and the second guide pin in place of the slide pin bolt having the conventional structure, the slide mechanism is constituted, so that the rubber bush is omitted. The number of parts can be reduced, and weight and cost can be reduced.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a disc brake device according to the present invention will be described below in detail with reference to the drawings. 1 to 6 show a first embodiment of a disc brake device according to the present invention. FIG. 1 is a partially cutaway plan view of the disc brake device, FIG.
3 is a sectional view taken along the line D-D in FIG. 3, FIG. 5 is a sectional view taken along the line EE in FIG. 4, and FIG. FIG. 4 is an enlarged view showing an engagement state between an engagement hole formed in a back metal of the pad and an auxiliary pin. The disc brake device 50 is of a floating caliper type mounted on a vehicle, and includes a pair of friction pads 3 and 4 that are opposed to each other across a rotor 1 that rotates integrally with wheels.
And the caliper 51 is connected to the rotor 1 via the slide mechanism 53.
And a support 54 slidably supported in the axial direction (the direction of arrow (c) in FIG. 1).

The caliper 51 includes a pair of friction pads 3 and 4.
A cylinder portion 7 containing a piston 5 for pressing one friction pad (inner pad) 3 against the rotor 1 is provided at one end, and a claw 8 for pressing the rear surface of the other friction pad (outer pad) 4. Is provided on the other end side.

The slide mechanism 53 slides the caliper 51 in the axial direction of the rotor 1 with two pins, a first guide pin (main guide pin) 56 and a second guide pin (auxiliary pin) 58. Support and support 54 possible
It is connected to.

That is, the main guide pin 56 is
One side (the right side in FIG. 1) is rotatable with respect to the support 54 and supported so as to be movable in the axial direction of the rotor 1, and is connected to the support 54. Also, the main guide pin 5
Numeral 6 is made of solid metal and has a base end formed in a threaded portion screwed to the caliper 51. Further, the pin portion 56a of the main guide pin 56 protruding from the caliper 51 is directly inserted into the guide hole 28 formed in the support 54 without passing through a bush or the like.

On the other hand, the auxiliary pin 58 is disposed on the other side (the left side in FIG. 1) of the caliper 51, and one end 58a is engaged with the claw 8, and the other end 58b is outside the cylinder 7 of the caliper 51. It is provided in a form to be engaged with the surface, and is formed by bending a wire (wire rod) such as a hard steel wire, a piano wire, and a carbon steel wire for cold heading into a substantially C shape. More specifically, one end 58a of the auxiliary pin 58 that engages with the claw 8
Is inserted through the through hole 59 formed in the nail 8 and the nail 8
Hole 6 formed in the back metal 27 of the friction pad 4 to be pressed
0 is engaged. Also, the other end 58b of the auxiliary pin 58
Is loosely fitted in an engagement hole 61 formed in the caliper 51. The intermediate portion of the auxiliary pin 58 is dimensioned so as to abut on the outer surface of the caliper 51, and the auxiliary pin 58
Is fixed to the outer surface of the caliper 51. One end 58a and the other end 58b of the auxiliary pin 58 are connected to the auxiliary pin 5
8 so as not to rotate on the caliper 51 carelessly.
As shown in (1), the axial centers are shifted from each other by a distance h (offset).

The outer pad 4 is pressed against the claw 8 by a leaf spring 62 as shown in FIGS.
The leaf spring 62 is provided with a back metal gripper 62 a for holding the back metal 27.
And a claw contact portion 62b that comes into contact with the outer surface of the claw 8 is formed integrally with a spring steel plate or the like. As shown in FIG. 6, the engagement hole 60 formed in the back metal 27 of the friction pad 4 is formed as a long hole along the length direction of the outer pad 4 (the circumferential direction of the rotor 1). This is to prevent the braking torque from acting on the one end 58a of the auxiliary pin 58 during braking.

Each of the friction pads 3 and 4 is generally provided with a hanging portion 29 formed on the side of the back metal 27.
By engaging with the pad guide portion 21 on the support 54, the rotor 1 is connected to the support 54 so as to be movable in the axial direction.

That is, the auxiliary pin 58 in the first embodiment connects the other side of the caliper 51 to the support 54 via the friction pad 4 pressed by the claw 8, and the caliper 51 connects the main guide pin 56 to the support 54. It restricts rotation about the center of rotation.

In the above-described disc brake device 50, the caliper 51 slides in the direction opposite to the advance direction of the piston due to the reaction force when the piston presses one friction pad 3 against the rotor 1 by the brake operation, and the pawl 8 Presses the other friction pad 4 against the rotor 1 so that the pair of friction pads 3 and 4 sandwich the rotor 1 to obtain a braking state.

In the disc brake device 50, the auxiliary pin 58 of the slide mechanism 53 for supporting the caliper 51 so as to be movable in the axial direction of the rotor 1 is connected to the other of the caliper 51 via the friction pad 4 pressed by the claw 8. The side is connected to the support 54, and the auxiliary pin 58 itself is formed as a linear body fixed to the caliper 51, and does not slide on the support 54 when the caliper 51 slides, so that the sliding resistance can be reduced. it can.

Further, since the auxiliary pin 58 does not pass through the support 54, the auxiliary pin 58 does not twist due to the dimensional tolerance or the braking torque acting upon braking.
The smooth movement of the caliper 51 during the brake operation can be favorably maintained for a long period of time.

Further, the auxiliary pin 58 itself is provided with the caliper 5.
1 and can be easily formed with a commercially available wire rod or the like, and it is not necessary to equip a rubber bush. Further, the processing required for mounting the auxiliary pin 58 is only required to form a simple insertion hole for inserting the auxiliary pin 58 in the caliper 51 and the back metal of the friction pad. Therefore, weight reduction and cost reduction can be achieved by reducing the number of parts and the machining. Moreover, since the auxiliary pin 58 can be assembled to the caliper 51 without screwing, the assemblability is improved.

FIGS. 7 to 9 show a second embodiment of the disc brake device according to the present invention. FIG. 7 is a partially cutaway plan view of the disc brake device, and FIG. FIG. 9 is a view on arrow G of FIG. The disc brake device 65 includes a spring member 67 for adjusting the posture of the caliper 51 in addition to the disc brake device 50 of the first embodiment.
The other configuration except for the configuration in which the spring member 67 is added has the same configuration as that of the disk brake device 50 described above. Note that the same components as those of the disc brake device 50 of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In general, in a floating caliper type disc brake device, as shown in FIG. 9, the position of the center of gravity P of the caliper 51 is biased toward the cylinder portion 7, and the bias of the center of gravity causes the position of the caliper 51 to change. work is the moment M ₁ to be incline to. This moment M
₁ is a factor that causes the friction pads 3 and 4 to come into contact with the rotor 1 on one side or hinders the sliding operation of the caliper 51 during braking.

The spring member 67, is engaged with the one end to the caliper 51, the compression spring engaging the other end to the support 54, as shown in FIG. 9, cancel the moment M ₁ described above by the center of gravity of the deviation The urging force F _{2 is applied} between the support 54 and the caliper 51 so that the moment M ₂ is generated.
Is generated, and the posture of the caliper 51 is corrected to a state without inclination.

The spring member 67 is formed by bending a commercially available wire (wire rod) such as a hard steel wire, a piano wire, a carbon steel wire for cold heading, and the like. In this state, the braking performance can be stabilized.

[0031]

As described above, according to the disc brake device of the present invention, the auxiliary pin of the slide mechanism for supporting the caliper so as to be movable in the axial direction of the rotor has one end inserted through the claw and the claw inserted into the auxiliary pin. This is a configuration in which the other side of the caliper is connected to the support via the friction pad by engaging with the back metal of the friction pad to be pressed. In other words, the auxiliary pin itself is a striated body fixed on the outer surface of the caliper, and does not slide with the support during the sliding operation of the caliper, so that the sliding resistance can be reduced. Also, the auxiliary pin does not twist due to the influence of the braking torque acting upon braking, and the smooth movement of the caliper during the braking operation can be favorably maintained for a long period of time. Further, the auxiliary pin itself is a striated body fixed on the outer surface of the caliper, and can be easily formed with a commercially available wire rod or the like. The processing required for mounting the pin is only required to form a simple insertion hole for inserting the end of the auxiliary pin in the caliper and the back metal of the friction pad. Therefore, weight reduction and cost reduction can be achieved by reducing the number of parts and the machining. In addition, since the auxiliary pin can be assembled to the caliper without screwing, the assemblability is improved.

[Brief description of the drawings]

FIG. 1 is a partially cutaway plan view of a first embodiment of a disc brake device according to the present invention.

FIG. 2 is a view taken in the direction of arrow B in FIG. 1;

FIG. 3 is a view as viewed in the direction of arrow C in FIG. 1;

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

FIG. 5 is a sectional view taken along line EE in FIG. 4;

FIG. 6 is an enlarged view showing an engagement state between an engagement hole formed in a back metal of the friction pad on the claw side in FIG. 1 and an auxiliary pin.

FIG. 7 is a partially cutaway plan view of a second embodiment of the disc brake device according to the present invention.

8 is a view as viewed from the direction of the arrow F in FIG. 7;

FIG. 9 is a view on arrow G in FIG. 8;

FIG. 10 is an exploded perspective view of a conventional disc brake device.

11 is a cross-sectional view showing an operation at the time of braking of the disc brake device shown in FIG.

FIG. 12 is a plan view showing another example of the conventional disc brake device.

13 is a view as viewed in the direction of the arrow A in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotor 3, 4 Friction pad 7 Cylinder part 8 Claw 18 Support arm 21 Pad guide part 28 Guide hole 29 Suspension part 50 Disc brake device 51 Caliper 53 Slide mechanism 54 Support 56 Main guide pin (first guide pin) 58 Auxiliary Pin (second guide pin) 58a One end 58b Other end 59 Through hole 60, 61 Engagement hole 65 Disc brake device 67 Spring member

Claims (1)

[Claims] 1. A pair of friction pads which are opposed to each other with a rotor interposed therebetween, and a claw which is provided at one end with a piston for pressing one friction pad of the friction pads against the rotor and presses a back surface of the other friction pad. A caliper provided on the other end side; and a support for supporting the caliper so as to be slidable in the axial direction of the rotor via a slide mechanism, wherein the piston is pressed against one friction pad of the piston against the rotor by a reaction force. The caliper slides,
A floating caliper type disc brake device in which the claw presses the other friction pad against the rotor, wherein the slide mechanism enables one side of the caliper to rotate with respect to the support and the axial direction of the rotor. A first guide pin movably connected to the first guide pin, the first guide pin restricting the rotation of the caliper about a rotation center, and being movable in the axial direction of the rotor to support the other side of the caliper. Second to connect to
The second guide pin has one end engaged with the claw and the other end engaged with an appropriate position on the caliper away from the claw, and the second guide pin is provided outside the caliper. It is fixed to the surface, and the one end is inserted into a through hole formed in the claw, and is engaged with an engagement hole formed in the back metal of the other friction pad, and the caliper is moved to the other friction pad. A disc brake device, which is connected to the support via a support.