JP2002139081A - Disc brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain reduction of a cost, by improvement of a yield of material and simplification of assembly work. SOLUTION: A retaining spring 20 for energizing a pad 10b in an outer side relating to a caliper 3 is constituted by bending a wire rod formed for preventing chattering. The wire rod for making this retaining spring 20 is slightly wasted, improvement of yield can be attained. This retaining spring 20 is prevented from obstructing in the case of assembling the other member, and simplification of assembly work can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION A disc brake according to the present invention is used for braking an automobile, and the present invention is for supporting a pad on an outer side with respect to a caliper constituting such a disc brake. The manufacturing cost of the spring is reduced, and the assemblability of the spring is improved.

[0002]

2. Description of the Related Art A basic structure of a disc brake used for braking an automobile will be described with reference to FIGS. A support 2 provided adjacent to the inner side of the rotor 1 that rotates together with the wheels (not shown) (the side closer to the center in the width direction when assembled to the vehicle, the upper side in FIG. 2 and the right side in FIG. 3). 2 is also fixed to a suspension device (not shown) via a mounting hole (not shown) provided on the inner diameter side (the lower side of FIGS. 1, 3, and 4). The support 2 includes a caliper 3 and a pair of guide pins 4 and 4 fixed to the caliper 3 and the support 2.
By engaging a pair of guide cylinders 5 provided on the rotor 1, the axial direction of the rotor 1 (front and back directions in FIGS.
(Up and down direction, left and right direction in FIG. 3).

The caliper 3 has a cylinder 6 at an inner end (an end which is closer to the center in the width direction when assembled to a vehicle, an upper end in FIG. 2 and a right end in FIG. 3), and an outer end ( The caliper claws 7 are provided at the lower end in FIG. 2 and the left end in FIG. The piston 8 is oil-tightly fitted in the cylinder portion 6 among them.

Further, a pair of engaging portions 9, 9 is provided at a part of the support 2 at a position separated in the circumferential direction of the rotor 1, and both of the engaging portions 9, 9 are provided on the inner side. Pad 1
0a are supported at both ends. The pad 10a is formed by attaching a lining 12 to one surface of a back plate 11a, and engagement projections 13, 13 formed at both ends of the back plate 11a are attached to the two engagement portions 9, 9, respectively. Formed engagement groove 1
The rotor 1 is slidably supported in the axial direction of the rotor 1 with respect to the engagement portions 9 by engaging with the engagement portions 4 and 14.
The inner surfaces of the engagement grooves 14, 14 and the engagement portions 9,
Anti-rattle springs 15, 15 made of stainless steel spring steel plate are interposed between the outer surfaces of the springs 9 and 9. These anti-rattle springs 15, 15 prevent the pad 10a from rattling due to vibration during traveling, and the sliding portions between the engaging grooves 14, 14 and the engaging portions 9, 9 are rusted. Prevent sticking.

On the other hand, the caliper 3 supports a pad 10b on the outer side (the lower side in FIG. 2 and the left side in FIG. 3 on the outer side in the width direction when assembled to a vehicle). The outer side pad 10b is also provided on one side (right side in FIG. 3) of the back plate 11b, similarly to the inner side pad 10a.
And a lining 12 attached thereto. However, portions corresponding to the engagement protrusions 13 and 13 are not provided at both ends of the back plate 11b constituting the pad 10b on the outer side. Instead, the engaging projections 16, 16 are respectively provided at two positions on the other surface (left surface in FIG. 3) of the back plate 11b in a state of protruding in the axial direction of the rotor 1 (left direction in FIG. 3). Has formed. Also, the inner surface of each of the caliper claws 7 (the side facing the center in the width direction when assembled to the vehicle, the upper side surface in FIG. 2 and the right side surface in FIG. 3) has the engaging protrusions 16, 16. Are formed with engagement recesses 17, 17 into which the respective engagement protrusions 16, 16 can be fitted.

The outer pad 10b is pressed against the inner surface of each of the caliper claws 7, 7 by a spring to prevent the pad 10b from rattling during braking. Conventionally, as a spring used for such a purpose, for example, a leaf spring as described in Japanese Patent Application Laid-Open No. 9-177846 has been used. This leaf spring is fixed at its base to a back plate 11b constituting the pad 10b on the outer side by caulking a projection provided on the back surface of the back plate 11b, and at the same time, a holding member extending from the base. The pieces are used to press the caliper claws 7, 7 against the back surface of the back plate 11b. In the state where the caliper claws 7, 7 are pressed against the back surface of the back plate 11b by the leaf spring, the pad 10b on the outer side does not rattle against the caliper 3. In the center of the caliper 3, an inspection hole 18 is provided to allow the inner and outer peripheral surfaces of the caliper 3 to communicate with each other.
By visually checking the thickness of the linings 12 and 12 of the pad 10b, it is possible to determine the replacement time of each of the pads 10a and 10b.

When the vehicle is braked by the disk brake as described above, the pressurized oil is fed into the cylinder portion 6 as the brake pedal is depressed, and one side (inner side, FIG. The pad 10a on the upper side, the right side in FIG.
2 (the right side in FIG. 3). The caliper 3 is displaced in a direction opposite to the pushing direction of the piston 8 (upward in FIG. 2 and rightward in FIG. 3) due to the reaction force accompanying the pressing, and a pair of caliper claws 7 provided on the caliper 3 are provided.
The pad 7 presses the other (outer side, lower side in FIG. 2, left side in FIG. 3) pad 10b against the other side surface (outer side surface, lower surface in FIG. 2, left side surface in FIG. 3) of the rotor 1. As a result, the pair of pads 10a and 10b strongly clamp the rotor 1 from both sides, and based on the frictional force acting between the linings 12 and 12 constituting these pads 10a and 10b and both side surfaces of the rotor 1. , Braking is performed.

During the braking, each of the pads 10a,
10b and the rotor 1
These pads 10a, 10b
Is supported by the support 2. First, the brake torque applied to the inner pad 10a is directly transmitted to the support 2. On the other hand, the brake torque applied to the outer pad 10b is based on the engagement between the engagement projections 16, 16 and the engagement recesses 17, 17, so that the caliper claws 7, 7 are provided. The power is transmitted to the caliper 3 and transmitted to the support 2 from the caliper 3 based on the engagement between the guide pins 4 and 4 and the guide cylinders 5 and 5.

When the brake is released, the pads 10a, 10a,
The force pressing the b to the rotor 1 is lost, and the pads 10a and 10b are displaced away from each other by the whirling motion of the rotor 1 or the elastic force of a return spring (not shown). As a result, the linings 12 of the pads 10a and 10b do not strongly rub against both side surfaces of the rotor 1. In addition, at the time of such non-braking, the anti-rattle springs 15, 15 elastically press the inner side pad 10a, so that
The pad 10a prevents the support 2 from rattling against the support 2, and prevents generation of unpleasant vibration and noise. The pad 10b on the outer side is also provided with the above-mentioned leaf spring, so that it does not rattle during non-braking.

[0010]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No. 9-1 is disclosed.
In the case of a structure that is conventionally known as described in Japanese Patent Application Laid-Open No. 77846, for example, in which the outer side pad 10b is pressed against the caliper claws 7, 7, not only the material cost of the leaf spring is increased, but also the assembling work is complicated. Therefore, it is inevitable that the cost increases. That is, the yield of the elastic metal plate used as the material of the leaf spring is poor, and a large amount of waste material is required. In addition, in order to mount the leaf spring on the back plate, a step of forming a projection on the back plate and a step of plastically deforming the projection are required. The work of assembling is troublesome. For this reason, assembling time is required, and the cost is increased in this respect as well. 5-1
Japanese Patent No. 4672 discloses a structure in which a leaf spring is fixedly connected to a back plate with a screw. A step of forming a screw hole in the back plate, a screw is screwed into the screw hole, and further tightened. Since a process is required, the cost also increases. The disc brake of the present invention has been invented in view of such circumstances.

[0011]

A disk brake according to the present invention has a support fixed to a vehicle body in a state adjacent to an inner side of a rotor that rotates together with wheels, similarly to a conventionally known disk brake. The inner side pad supported by the support so that the axial displacement of the rotor can be freely adjusted, the caliper supported by the support such that the axial displacement of the rotor can be freely adjusted, a piston built in the caliper, An outer-side pad supported by the caliper on the outer side. When the piston is pushed out, the inner side pad is pressed against the side surface of the rotor by the piston, and the outer side pad is pressed against the side surface of the rotor by a caliper claw provided on the caliper. In particular, the disc brake according to the present invention includes a retaining spring having a pair of retaining portions. One of the pair of holding portions contacts the surface of the outer pad facing the rotor, and the other of the pair of holding portions contacts the outer end of the caliper. And presses the pad on the outer side toward the caliper claw.

[0012]

According to the disk brake of the present invention having the above-described structure, the retaining spring can be easily inserted between the pad and the caliper after the outer pad is assembled to the inner surface of the caliper claw. Therefore, the assembly work can be simplified. Further, in the case where the above-mentioned restraining spring is formed by bending a wire material, almost no waste material is produced, so that the material cost of the restraining spring can be reduced.

[0013]

1 to 4 show an example of an embodiment of the present invention. The feature of the present invention lies in the structure of the portion for holding the outer pad 10b on the inner surface of the caliper claws 7, 7. As described above, since the structure of the other parts is the same as the conventionally known structure, the description of the overlapping parts is omitted, and the characteristic parts of the present invention and the parts not described above are described below. I will explain mainly.

The outer end surface of the caliper 3 (the lower end in FIG.
At the center of the rotor 1 in the circumferential direction.
Is formed, and the feature of the present invention is formed in this concave groove 19 portion.
The holding spring 20 is freely attachable. This holding spring 20
Is formed by bending a wire having elasticity and corrosion resistance, such as stainless steel spring steel.
1a and 21b, and a coil portion 22 provided at an intermediate portion of a connecting portion connecting the base portions (upper portions in FIGS. 1 and 3). The coil portions 22 impart elasticity in a direction in which the tip portions (the lower end portions in FIGS. 1 and 3) of the both holding portions 21a and 21b are brought closer to each other. In addition, each of the holding parts 2
Curved portions 23a and 23b that are curved in directions approaching each other are formed at the distal ends of 1a and 21b.

On the other hand, a part of the back plate 11b constituting the pad 10b on the outer side, the central part in the circumferential direction of the rotor 1 and the half part on the outer diameter side in the radial direction of the rotor 1, the inner side restraint. A locking portion 24 for locking the portion 21a is formed. The locking portion 24 includes a groove 25 formed in a radial direction of the rotor 1 (vertical direction in FIGS. 1, 3, and 4) on a surface of the back plate 11b facing the rotor 1;
A locking hole 26 is formed at the inner end of the groove 25 in the radial direction so as to penetrate the back plate 11b.

The restraining spring 20 is mounted so as to sandwich the outer end surface of the caliper 3 and the locking portion 24 of the back plate 11b constituting the outer pad 10b.
Toward the inner surface of each of the caliper claws 7, 7.
In other words, a pair of holding portions 21 constituting the holding spring 20
a, 21b, the inner holding portion 21a is inserted into the locking portion 24 provided on the back plate 11b, and the outer holding portion 21b is placed on the outer end surface of the caliper 3 and in the circumferential center of the rotor 1. Is engaged with the concave groove 19 formed in the above. In this state, the curved portion 23a formed at the distal end of the inner-side restraining portion 21a is engaged with the locking hole 26, and the curved portion 23b formed at the distal-end of the outer-side restraining portion 21b is removed. The caliper 3 is engaged with the central inner peripheral edge.

As described above, when the holding spring 20 is attached to the connecting portion 31 of each of the caliper claws 7, 7 adjacent to the inspection hole 18 of the caliper 3, the pair of holding portions 21
The space between the members a and 21b is elastically widened. For this reason, the back plate 11b is provided with the respective caliper claws 7, 7
The pad 10b on the outer side does not rattle during non-braking. In addition, each of the curved portions 2
The engagement between the locking holes 26 and the central inner peripheral edge of the caliper 3 prevents the restraining spring 20 from being displaced radially outward of the rotor 1. Therefore, regardless of the vibration applied during traveling, etc.,
Is prevented from dropping carelessly.

In the disc brake of the present invention constructed as described above, the outer pad 10b is pressed against the inner surface of each of the caliper claws 7, 7 by a restraining spring 20 formed by bending a wire. are doing. Since such a pressing spring 20 is formed by cutting and bending a long wire at a predetermined length, only a portion of the end of the wire which is shorter than the predetermined length is a waste material. In addition, the yield of the material can be made much higher than before.

After the outer pad 10b is attached to the inner surface of each of the caliper claws 7 and 7, the respective pressing portions 21a and 21b are attached to the back plate 21 from above the caliper 3. By pushing along the concave groove 25 of 11b and the concave groove 19 of the caliper 3, it can be easily mounted on the connecting portion 31 of each of the caliper claws 7, 7. Therefore, the pressing spring 20 does not hinder the operation of assembling the pad 10b to the caliper 3. Therefore, the assembling work can be simplified. By improving the material yield and simplifying the assembling operation, the cost of the disc brake can be reduced. In this example, the holding spring 20 is
The wire spring is formed by bending a wire material.
The disc brake described in (1) is not limited to this, and may be a leaf spring as long as it has a configuration in which elasticity is applied in a direction in which a pair of restraining portions including each tip end are brought closer to each other. You can do things.

In the illustrated example, each of the caliper claws 7
A shim plate 27 is sandwiched between the inner side surface of the base plate and the back surface of the back plate 11b constituting the outer pad 10b. or,
Since the drawing shows a state in which the disc brake is conveyed, the supply / discharge port 28 formed at the inner end of the caliper 3 is
It is closed by blind plug 29.

[0021]

Since the disk brake of the present invention is constructed and operates as described above, the cost can be reduced by improving the material yield and increasing the efficiency of the assembling work.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of an embodiment of the present invention.

FIG. 2 is a view as seen from above in FIG. 1;

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a view seen from the right side of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotor 2 Support 3 Caliper 4 Guide pin 5 Guide cylinder part 6 Cylinder part 7 Caliper claw 8 Piston 9 Engagement part 10a, 10b Pad 11a, 11b Back plate 12 Lining 13 Engagement projection part 14 Engagement groove 15 Anti-rattle spring 16 Engagement projection 17 Engagement recess 18 Inspection hole 19 Depression groove 20 Suppression spring 21a, 21b Suppression part 22 Coil part 23a, 23b Curved part 24 Locking part 25 Depression groove 26 Locking hole 27 Shim plate 28 Supply / discharge port 29 Blind plug 30 Outer end 31 Connecting part

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yukio Iwata 19-5 Nihonbashi Koami-cho, Chuo-ku, Tokyo F-term in Akebono Brake Industry Co., Ltd. (reference) 3J058 AA43 AA48 AA53 AA58 AA63 AA69 AA73 AA77 AA83 AA87 BA64 CA65 FA01

Claims (3)

[Claims] 1. A support fixed to a vehicle body adjacent to an inner side of a rotor that rotates with wheels, an inner pad supported by the support and capable of freely displacing the rotor in an axial direction, and the rotor A caliper supported by the support so that the axial displacement of the caliper can be freely adjusted, a piston built in the caliper, and an outer pad supported by the caliper on the outer side of the rotor. In addition, a pair of holding parts are provided in a disk brake in which the inner side pad is pressed by the piston and the outer side pad is pressed against the side surface of the rotor by a caliper claw provided on the caliper. One of the pair of pressing portions faces the rotor of the outer pad. A disc brake characterized in that the other side of the pair of holding portions abuts against the outer end of the caliper, and the outer pad is pressed toward the caliper claw. 2. The disc brake according to claim 1, wherein the holding spring comprises a wire spring. 3. A groove in which a holding portion constituting a holding spring abuts on at least one of a rotor-side surface of a back plate of an outer-side pad and an outer end of a caliper, along a radial direction of the rotor. The disc brake according to claim 1, wherein the disc brake is provided.