JP3185459B2 - 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 disc brake device, and more particularly to a disc brake device for suppressing the occurrence of brake squeal.

[0002]

2. Description of the Related Art Generally, a brake pad is displaceably supported by a mounting plate in a floating state. Also, when the brake oil pressure is low, the inner peripheral edge of the friction material of the brake pad on the disk rotor rotation is pressed against the sliding surface of the disk rotor.
439 and the like. Thus, when the friction material is locally pressed by the disk rotor,
Since the brake pad is in a floating state, vibration is excited in the brake pad, and this vibration is heard as brake squeal.

A disc brake device disclosed in Japanese Utility Model Laid-Open No. 18439/1987 can be cited as an example of a disc brake device for suppressing the above-mentioned brake squeal.
A disc brake device as disclosed in Japanese Utility Model Laid-Open Publication No. Sho 62-18439 has a chamfered edge portion of a friction material on the inner peripheral side of the disc rotor rotation.

According to the disk brake device disclosed in Japanese Utility Model Laid-Open No. 18439/1987, the portion of the friction material pressed by the disk rotor in a state where the brake oil pressure is low is chamfered, so that the brake oil pressure is low. In this case, the friction material is not locally pressed by the disk rotor. Therefore, it is possible to suppress brake squeal when the brake oil pressure is low.

[0005]

SUMMARY OF THE INVENTION
As shown in Japanese Patent No. -18439, when the brake oil pressure becomes high, the portion of the friction material pressed by the disk rotor changes from the state where the brake oil pressure is low.
In a disk brake device as disclosed in Japanese Utility Model Application Laid-Open No. Sho 62-18439, it cannot be avoided that the brake pad is locally pressed by the disk rotor when the brake oil pressure is high. Brake squeal cannot be sufficiently suppressed.

According to the present invention, the rotational moment in one direction is made larger than the rotational moment in the other direction among the rotational moments about the trailing side ear portion applied to the brake pad during braking, and the brake pad is pressed against the mounting plate. An object of the present invention is to suppress the vibration of a brake pad by restraining the brake pad, and to suppress the brake squeal regardless of the level of the brake hydraulic pressure.

[0007]

According to a first aspect of the present invention, there is provided a disk rotor which rotates together with a wheel, a friction material and a back metal. A brake pad provided to face a sliding surface of the disk rotor, a pair of ears provided at the disk rotor circumferential end of the back metal, and a disk attached to the vehicle body; In a disc brake device having a mounting plate that is displaceably supported in the direction of the rotor rotation axis, the friction material is chamfered or deleted, and the chamfering or deletion is performed.
The friction member is provided on a portion of the friction material existing inside a circle having a diameter that is a line segment connecting the trailing ear and the disk rotor rotation center among the pair of ears.

[0008]

[0009] In order to solve the above problems, the second origination <br/> Ming specific means, as claimed in claim 2, and a disc rotor rotating with a wheel, the friction material and the back plate Consisting of
A brake pad provided to face the sliding surface of the disk rotor, a pair of ears provided at the disk rotor circumferential end of the back metal, and attached to the vehicle body;
A brake caliper that presses the brake pad toward the sliding surface of the disk rotor via a mounting plate that supports the ear portion so as to be displaceable in the disk rotor rotation axis direction and an anti-squeal shim provided on the back metal. In the disk brake device having the above, the inner peripheral side end of the disk rotor of the portion where the brake caliper of the anti-squeal shim abuts is substantially on the same straight line as the outer peripheral side end of the pair of ears. It is characterized by having.

[0010] In order to solve the above problems, the third origination <br/> Ming specific means, as claimed in claim 3, and a disc rotor rotating with a wheel, the friction material and the back plate Consisting of
A brake pad provided to face the sliding surface of the disk rotor, a pair of ears provided at the disk rotor circumferential end of the back metal, and attached to the vehicle body;
A brake caliper that presses the brake pad toward the sliding surface of the disk rotor via a mounting plate that supports the ear portion so as to be displaceable in the disk rotor rotation axis direction and an anti-squeal shim provided on the back metal. In the disk brake device having the above, the outer peripheral end of the disk rotor of a portion of the anti-squeal shim where the brake caliper abuts is substantially on the same straight line as the inner peripheral side end of the pair of ears. It is characterized by having.

[0011]

According to the disk brake device of the first aspect, when the friction material of the brake pad is pressed against the sliding surface of the disk rotor during braking, the friction material is applied to the rotating disk rotor. A drag force is applied. Ears provided on the trailing side of the backing metal engage with the mounting plate to receive the force of the friction material being dragged, and are received by the mounting plate. The friction material has been chamfered or deleted.
Since the frictional material is located inside the circle whose diameter is the line connecting the ear on the trailing side and the center of rotation of the disk rotor, the force that the frictional material is dragged from the ear on the trailing side Is also applied to the outer peripheral side of the disk rotor rotation. Accordingly, a moment occurs in which the brake pad rotates toward the outer periphery of the disk rotor with the trailing-side ear as a fulcrum, so that the leading-side ear of the brake pad is pressed against the mounting plate supporting the ear.

[0012]

According to the disc brake device of the second aspect of the present invention, when the brake caliper presses the friction material of the brake pad against the sliding surface of the disc rotor via the anti-squeal shim during braking, the friction material Is applied to the rotating disk rotor. Ears provided on the trailing side of the backing metal engage with the mounting plate to receive the force of the friction material being dragged, and are received by the mounting plate. The inner periphery of the disc rotor at the portion where the brake caliper of the anti-squeal shim contacts is substantially co-linear with the outer periphery of the disc rotor of the pair of lugs. Than on the outer peripheral side of the disk rotor rotation. Therefore, the force of the friction material being dragged is applied to the outer periphery of the disk rotor rotation rather than the trailing side ear. For this reason, a moment occurs in which the brake pad rotates toward the outer periphery of the disk rotor with the ear on the trailing side as a fulcrum, so that the leading ear of the brake pad is pressed against the mounting plate supporting the ear.

According to the disk brake device of the third aspect of the present invention, when the brake caliper presses the friction material of the brake pad against the sliding surface of the disk rotor via the anti-squeal shim during braking, the friction material Is applied to the rotating disk rotor. Ears provided on the trailing side of the backing metal engage with the mounting plate to receive the force of the friction material being dragged, and are received by the mounting plate. The outer periphery of the disc rotor at the portion where the brake calipers of the anti-squeal shim abuts is substantially on the same straight line as the inner periphery of the disc rotor of the pair of lugs. Than on the inner peripheral side of the disk rotor rotation. Therefore, the force of dragging the friction material is applied to the inner peripheral side of the disk rotor more than the ear on the trailing side. For this reason, a moment occurs in which the brake pad rotates toward the inner periphery of the disk rotor with the ear on the trailing side as a fulcrum, and the leading ear of the brake pad is pressed against the mounting plate supporting the ear. .

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the first to third inventions will be described in detail with reference to the drawings. In FIG. 2, reference numeral 1 denotes a disk rotor, which rotates together with wheels (not shown). The side surfaces 2 and 3 of the disk rotor 1 are sliding surfaces, and the brake pads 4 and 5 are opposed to each other.

Reference numeral 6 denotes a brake caliper, which is attached to a vehicle body (not shown) so as to be displaceable in the left-right direction in FIG. The brake caliper 6 has a cylinder 7, and a bottomed hole 8 is formed in the cylinder 7, and a piston 9 is slidably fitted in the hole 8. A port 10 is provided at the bottom of the hole 8 and is connected to a master cylinder (not shown) so that brake oil flows into the hole 8 by operating a brake operating member (not shown).

When the brake fluid flows into the hole 8, the piston 9 slides from the original position shown in FIG. 2 to the left in FIG. 2 and presses the brake pad 4 against the sliding surface 2 of the disk rotor 1. When the brake pad 4 is pressed by the disk rotor 1, the piston 9 stops sliding. Even if the piston 9 stops sliding, if the brake oil flows into the hole 8,
The brake hydraulic pressure inside increases. Since the cylinder 7 and the brake caliper 6 can be displaced in the left-right direction in FIG. 2, the brake caliper 6 is displaced rightward in FIG.

The brake caliper 6 is provided with a pawl 11. The pawl 11 is displaced rightward with the brake caliper 6.
Numeral 11 is for pressing the brake pad 5 against the sliding surface 3 of the disk rotor 1.

Reference numeral 12 denotes a retraction ring for preventing the brake from being dragged. The retraction ring 12 is provided on the cylinder 7, and the cylinder 7 and the piston 9
The elastic displacement of the cylinder 7 and the piston 9 causes the relative displacement of the cylinder 7 and the piston 9 to return to the original position shown in FIG.

Reference numeral 13 denotes a dust cover which prevents foreign substances such as water and mud from entering the holes 8.

The brake pad 4 includes a friction material 14 and a back metal 15.
Consisting of As shown in FIG. 1, lugs 16 and 17 are provided at the circumferential end of the back metal 15 in the disk rotor 1 respectively. The ears 16 and 17 are mounted on a mounting plate to be described later.
Gripped by 29. The brake pads 4 are supported by the lugs 16, 17 and the mounting plate 29 so as to be displaceable in the direction of the rotation axis of the disk rotor 1. still,
The arrow in FIG. 1 indicates the rotation direction of the disk rotor 1 when the vehicle moves forward. That is, 16 is the trailing ear,
17 is the leading ear.

The friction material 14 has been deleted. In the present embodiment, an imaginary circle 18 whose diameter is a line segment connecting the trailing side ear 16 and the rotation center O of the disk rotor 1,
The inner peripheral side of the disk rotor for one rotation is deleted with a string 19 formed by connecting two intersections with the outline of the friction material 14 as a boundary. The removal of the friction material 14 is performed on the friction material 14 existing inside the virtual circle 18.

The brake pad 4 is connected to an ear part by a mounting plate 29 fixed to a vehicle body (not shown).
16 and 17 are supported so as to be displaceable in the direction of one rotation axis of the disk rotor. Numerals 30 and 31 denote anti-rattle springs, which elastically support the brake pads 4 to prevent rattling of the brake pads 4.

The brake pad 5 includes a friction material 20 and a back metal 21.
Consisting of As shown in FIG. 3, lugs 22 and 23 are provided at the circumferential end of the back metal 21 in the disk rotor 1 respectively. The ears 22 and 23 are mounted on a mounting plate described later.
Gripped by 32. The brake pads 5 are supported by the lugs 22, 23 and the mounting plate 32 so as to be displaceable in the direction of the rotation axis of the disk rotor 1. still,
The arrow in FIG. 3 indicates the rotation direction of the disk rotor 1 when the vehicle moves forward. That is, 22 is the trailing ear,
23 is the leading ear.

An anti-squeal shim 24 is provided on the surface of the back metal 21 opposite to the surface to which the friction material 20 is adhered.
The anti-squill shim 24 includes the claws 11 of the brake caliper 6
Abuts on a portion indicated by a two-dot chain line in FIG. The inner peripheral side (lower side in FIG. 3) ends 25 and 26 of the anti-squeal shim 24 where the claws 11 abut are located on the outer peripheral side (upper side in FIG. 3) of the ear portions 22 and 23 of the disk rotor 1. The ends 27 and 28 are substantially co-linear.

The brake pad 5 is also a brake pad 4
Similarly, the ear plate 2
2 and 23 are supported so as to be displaceable in the direction of the rotation axis of the disk rotor 1, and are elastically supported by anti-rattle springs 33 and 34.

In the disk brake device constructed as described above, when a brake operating member (not shown) is operated, the friction material 14 of the brake pad 4 is attached to the sliding surface 2 of the disk rotor 1 and the brake pad 5 Friction material
20 are pressed against the sliding surfaces 3 respectively.

When the friction member 14 of the brake pad 4 is pressed against the sliding surface 2 of the disk rotor 1, a force is applied to the friction member 14 to be dragged by the rotating disk rotor 1. This force is received by the mounting plate 29 via the anti-rattle spring 30 by the trailing ear 16.

As described above, the shape of the friction material 14 is as shown in FIG. 1, so that the frictional material 14 is dragged more by the force of the disk rotor 1 than by the trailing ear 16.
On the outer circumference of rotation (upper side in FIG. 1).

Accordingly, a moment is generated in the brake pad 4 about the trailing ear 16 as a fulcrum, and the brake pad 4 rotates (rotates clockwise in FIG. 1) toward the outer circumference of rotation of the disk rotor 1. Due to this moment, the disk rotor 1 on the leading ear 17 of the brake pad 4
The outer peripheral side (upper side in Fig. 1) of the mounting plate is
It is pushed to 29.

Conventionally, the leading ear 17 of the brake pad 4 is urged toward the outer circumference of rotation of the disk rotor 1 (upper side in FIG. 1) by the anti-rattle spring 31. However, since the bias is small,
This allows the brake pad 4 to be displaced toward the inner rotation side (the lower side in FIG. 1) of the disk rotor 1. That is, when vibration in the circumferential direction of the disk rotor 1 (vertical direction in FIG. 1) is excited on the brake pad 4, it cannot be stopped. However, according to the brake pad 4 of the present embodiment, the leading side ear portion
Since the brake pad 4 is fixed to the mounting plate 29 by pressing the 17 against the mounting plate 29, the vibration of the brake pad 4 in the circumferential direction of the disk rotor 1 rotation (vertical direction in FIG. 1) is suppressed. And brake squeal can be suppressed.

On the other hand, when the friction material 20 of the brake pad 5 is pressed against the sliding surface 3 of the disk rotor 1, a force is applied to the friction material 20 to be dragged by the rotating disk rotor 1.
This force is received by the mounting plate 32 via the anti-rattle spring 33 by the trailing ear 22.

The brake pad 5 is connected to the disk rotor 1 via the anti-squeal shim 24 by the pawl 11 of the caliper 6.
Is pressed by the sliding surface 3. Since the shape of the anti-squeal shim 24 is as shown in FIG. 3 as described above, the friction material 20 is located closer to the outer circumference of rotation of the disk rotor 1 than the trailing-side ear 22 (upper side in FIG. 3). It is pressed against the sliding surface 3. The force with which the friction material 20 is dragged is applied to the rotation outer peripheral side (upper side in FIG. 3) of the disk rotor 1 with respect to the trailing side ear portion 22.

Accordingly, a moment is generated in the brake pad 5 with the trailing ear 22 as a fulcrum, in which the brake pad 5 rotates toward the outer circumference of the disk rotor 1 (clockwise rotation in FIG. 3). Due to this moment, the disk rotor 1 of the leading ear 23 of the brake pad 5 is moved.
The outer peripheral side (upper side in FIG. 3) of the mounting plate is
It is pushed to 32.

When the leading ear 23 is pressed against the mounting plate 32, the brake pad 5 is fixed to the mounting plate 32, so that the brake pad 5 rotates in the disk rotor 1 rotation circumferential direction (vertical direction in FIG. 3). Vibration can be suppressed, and brake squeal can be suppressed.

In this embodiment, the disk brake device provided with the brake pad 4 corresponds to the disk brake device according to the first aspect, and the disk brake device provided with the brake pad 5 is the disk brake device according to the second aspect. Corresponds to the device.

In this embodiment, the friction material 14 has a portion in the virtual circle 18 removed from the string 19, but the friction material in this portion may be chamfered.
A portion of the friction material 14 within the virtual circle 18 may be deleted or chamfered. It suffices that the force by which the friction material 14 is dragged is applied to the outer peripheral side of the rotation of the disk rotor 1 rather than the trailing ear 16.

[0038]

[0039]

[0040]

[0041]

[0042]

[0043]

[0044]

Another embodiment of the brake pad 5 shown in FIG . 4 is shown. Note that the same parts as those of the brake pad 5 of FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted.

The disk rotor 1 at the portion of the anti-squeal shim 36 of the brake pad 5 shown in FIG . 4 where the claw 11 of the brake caliper 6 abuts (the portion shown by the two-dot chain line in FIG. 4 ).
The outer peripheral side (upper side in FIG. 4 ) ends 37, 38 are substantially co-linear with the inner peripheral side (lower side in FIG. 4 ) ends 39, 40 of the ear portions 22, 23.

When the friction material 20 of the brake pad 5 is pressed against the sliding surface 3 of the disk rotor 1, a force is applied to the friction material 20 by the rotation of the disk rotor 1. This force is received by the mounting plate 32 via the anti-rattle spring 33 by the trailing ear 22.

The brake pad 5 is moved by the pawl 11 of the caliper 6 through the anti-squeal shim 36 to the disk rotor 1.
Is pressed by the sliding surface 3. As described above, the shape of the anti-squeal shim 36 is as shown in FIG. 4, so that the friction material 20 is located on the inner circumferential side of the disk rotor 1 (the lower side in FIG. ) Is pressed against the sliding surface 3. The force with which the friction material 20 is dragged is applied to the rotation inner peripheral side (the lower side in FIG. 4 ) of the disk rotor 1 with respect to the trailing side ear 22.

Accordingly, a moment is generated in the brake pad 5 such that the brake pad 5 rotates toward the inner circumference of the disk rotor 1 (left rotation in FIG. 4 ) with the trailing ear 22 as a fulcrum. Due to this moment, the disk rotor 1 of the leading ear 23 of the brake pad 5 is moved.
4 is pressed against the mounting plate 32 via the anti-rattle spring 34.

When the leading ear 23 is pressed against the mounting plate 32, the brake pad 5 is fixed to the mounting plate 32, so that the brake pad 5 rotates in the disk rotor 1 rotation circumferential direction (vertical direction in FIG. 4 ). Vibration can be suppressed, and brake squeal can be suppressed.

[0051] The disk brake apparatus having a brake pad 5 shown in FIG. 4 corresponds to the disc brake device according to claim 3.

In each of the above embodiments, the anti-rattle spring applies an elastic force to the brake pad from the inner peripheral side to the outer peripheral side of the disk rotor. The elastic force may be applied from the side to the inner peripheral side.

In addition, the present invention can be carried out in various modified and improved forms with the knowledge of those skilled in the art, such as using the brake pad having the structure shown in FIG. 1 for the outer brake pad.

According to the disc brake device of the first to third aspects of the present invention, the leading edge of the brake pad is pressed against the mounting plate, so that the brake pad is fixed to the mounting plate. Vibration in the disk rotor rotation circumferential direction can be suppressed, and brake squeal can be suppressed regardless of the level of the brake hydraulic pressure.

[Brief description of the drawings]

FIG. 1 is a side view showing a main part of an embodiment of a disc brake device according to the first invention.

FIG. 2 is a sectional view illustrating an embodiment of the present invention.

FIG. 3 is a side view showing a main part of an embodiment of the disc brake device of the second invention.

FIG. 4 is a side view showing a main part of an embodiment of the disc brake device of the third invention.

[EXPLANATION OF SYMBOLS] 1 ........ disc rotor 4,5 ...... brake pad 6 ........ brake caliper 1 4 · · · · · · friction material 24, 36: Anti-skile shim 16, 17, 22, 23: Ears 29, 32: Mounting plate

──────────────────────────────────────────────────続 き Continued from the front page (72) Inventor Hidetoshi Shimizu 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Market Yasuaki 1 Toyota Town Toyota City, Toyota City Inside Toyota Motor Corporation ( 72) Inventor Hiromichi Yamazaki 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Co., Ltd. (56) References JP-A-1-172645 (JP, A) JP-A 1-132824 (JP, U) JP-A 62-18439 (JP, U) Japanese Utility Model 62-143828 (JP, U) Japanese Utility Model 62-1222931 (JP, U) Japanese Utility Model Application No. 22-22377 (Japanese Utility Model Application No. 3-114639) attached (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16D 65/092 F16D 65/095

Claims (3)

(57) [Claims] 1. A disk rotor that rotates with wheels, a brake pad made of a friction material and a back metal, provided on a sliding surface of the disk rotor, and a brake pad provided on an end of the back metal in a circumferential direction of the disk rotor. A disc brake device comprising: a pair of ears provided; and a mounting plate attached to a vehicle body and supporting the ears so that the ears can be displaced in a direction of the rotation axis of the disk rotor. The chamfering or deletion is performed on a friction material portion existing inside a circle whose diameter is a line segment connecting the trailing side ear portion and the disk rotor rotation center of the pair of ear portions. Disc brake device characterized by the following. A disc rotor rotating with 2. A wheel composed of a friction material and the backing plate, wherein a brake pad is opposed to the sliding surface of the disk rotor, the back gold, the disc rotor circumferential ends A pair of ears provided on the vehicle body; a mounting plate attached to the vehicle body to support the ears so as to be displaceable in the disk rotor rotation axis direction; and the brake pad via an anti-squeal shim provided on the back metal. And a brake caliper for pressing the brake caliper against the sliding surface side of the disc rotor, wherein the inner end of the anti-squeal shim with which the brake caliper abuts on the inner peripheral side of the disc rotor has the pair of ear portions. Characterized in that the disc brake is substantially co-linear with the outer peripheral end of the disc rotor. Location. 3. A disk rotor which rotates together with wheels, a brake pad comprising a friction material and a back metal, provided on a sliding surface of the disk rotor, and a brake pad provided on an end of the back metal in a circumferential direction of the disk rotor. A pair of ears provided, a mounting plate attached to a vehicle body and supporting the ears so as to be displaceable in the disk rotor rotation axis direction, and the brake pad via an anti-squeal shim provided on the back metal. A disc brake device having a brake caliper that presses against the sliding surface side of the disc rotor, wherein an outer peripheral end of the disc rotor of a portion of the anti-squeal shim that the brake caliper abuts has a pair of ear portions. A disk rotor which is substantially co-linear with the inner peripheral end of the disk rotor. Apparatus.