JPH0893807A - Disk brake - Google Patents

Abstract

PURPOSE: To reduce dragging due to the surface deviation of a disk rotor in a disk brake. CONSTITUTION: A projection part 15 is provided at both ends in the rotating direction of a disk rotor 3 of the back plate 14 of a pad 13. The projection part 15 is fitted into a groove 10 to slidably support the pad 13 in a carrier 17. The cross section of an abutting part 16 on the carrier 7 of the projection part 15 is made into a nearly circular arc form so that the pad 13 is tilted to line carrier 7. When the rotating shaft of the disk rotor 3 is tilted at an angle α and the surface contact is generated in the brake surface, the pad 13 is tilted to follow the brake surface, so that a proper clearance may be always kept between the pad 13 and the disk rotor 3 when a brake is not operated. Thereby, the dragging due to the surface deviation of the disk rotor 3 is reduced to be able to enhance a fuel consumption rate and a judder phenomenon due to the partial abrasion of the disk rotor 3 can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a disc brake used as a braking device for automobiles and the like.

[0002]

2. Description of the Related Art As an example, a conventional disc brake mounted on an automobile will be described with reference to FIG.

As shown in FIG. 12, the disc brake 1
Is a caliper floating disc brake, the caliper body 2 is provided with a piston 4 facing one side of a disc rotor 3 that rotates with wheels (not shown), and straddles the disc rotor 3. The claw portion 5 is formed so as to face the surface on the opposite side. Disk rotor 3
A pair of pads 6 (only the claw portion 5 side is shown) are provided between the piston 4 and the piston 4, and between the claw portion 5, that is, on both sides of the disk rotor 3.

The caliper body 2 is guided by a carrier 7 fixed to the vehicle body side by a slide pin (not shown) so as to be movable along the axial direction of the disc rotor 3. Further, the pair of pads 6 has a back metal 9 having projections 8 provided at both ends in the rotational direction of the disk rotor 3 fitted into a groove 10 of a carrier 7 via a pad spring 11 to allow the disk rotor 3 It is slidably guided along the axial direction.

Then, by supplying pressure oil from a master cylinder (not shown) to move the piston 4 forward, one pad 6 (not shown) is directly pressed against the disk rotor 3 and its reaction force is applied. Caliper body 2
Is moved to press the other pad 6 against the disc rotor 3 via the claw portion 5 to generate a braking force. At this time,
The back metal 9 of the pad 6, which is dragged by the rotational force of the disk rotor 3, is supported by the torque receiving surface 12 of the carrier 7 via the pad spring 11.

[0006]

However, the above-mentioned conventional disc brake 1 has the following problems.
That is, since the end surface of the backing 9 of the pad 6, the torque receiving surface 12 of the carrier 7, and the contact portion of the convex portion 8 and the groove portion 10 are flat, the mounting angle of the pad 6 to the carrier 7 is fixed by this contact portion. ing.

Therefore, when the disc run-up of the disc rotor 3 causes an inclination between the braking face of the disc rotor 3 and the friction face of the pad 6, the disc rotor 3 of the pad 6 is
Is poorly tracked, and dragging is likely to occur during non-braking. If dragging occurs due to surface wobbling of the disc rotor 3, the fuel consumption rate may be deteriorated, and a judder phenomenon may occur due to uneven wear of the disc rotor 3.

The present invention has been made in view of the above points, and an object of the present invention is to provide a disc brake which reduces drag due to surface wobbling of the disc rotor.

[0009]

In order to solve the above-mentioned problems, the present invention provides a disc brake in which a back metal of a pad is slidably guided by a carrier, and a contact portion of the back metal with the carrier is formed. It is characterized in that the cross-section is formed in a substantially arc shape, and the pad can be inclined with respect to the carrier along the braking surface of the disk rotor.

[0010]

With this configuration, the pad follows the surface runout of the disk rotor while being inclined along the braking surface of the disk rotor.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. The disc brake according to the present embodiment is generally the same as the disc brake shown in FIG. 12 except that only the pads are different. Are assigned the same numbers, and only different portions will be described in detail.

As shown in FIGS. 2 to 6, in the disc brake according to the present embodiment, similar to that shown in FIG.
At both ends of the backing metal 14 of the pad 13 in the rotation direction of the disk rotor 3, there are provided convex portions 15 which are fitted with the groove portion 10 of the carrier 7 via the pad spring 11, and the pad 13 slides along the carrier groove portion 10. It is movably guided. The contact portions 16 and 17 of the convex portion 15 with the groove portion 10 (pad spring 11) are shown in FIG.
And as shown in FIG. 5, the cross-sectional shape is formed in a substantially arc shape. As shown in FIG. 1, the disk rotor 3 is rotatable about the axis along the rotation direction (tangential direction) with respect to the carrier 7, that is, can be inclined with respect to the radial direction of the disk rotor 3. Supported by.

Contacting portions 18 for contacting the torque receiving surface 12 (pad spring 11) of the carrier 7 are provided at both ends of the back metal 14 in the rotation direction of the disk rotor 3. Abutment 18
As shown in FIG. 6, the cross section is formed in a substantially arc shape. Then, as shown in FIG. 7, the disk rotor 3 can be rotated about the axis along the radial direction with respect to the carrier 7, that is, can be inclined with respect to the rotational direction (tangential direction) of the disk rotor 3. Supported by. In addition, the substantially arcuate cross-sectional shape of the contact portions 16, 17, 18 is
A part of a circle or an ellipse, or a shape having a roundness such as a curved line combining them can be used.

The contact portions 16 and 17 and the contact portion 18 of the back metal 14 are
If the cross-sectional shape is substantially arcuate, the contact area with the carrier 7 side becomes smaller and the surface pressure becomes higher, so induction hardening,
Surface hardening treatment such as carburizing and nitriding may be applied to prevent abrasion and indentation. As a result, it is possible to prevent the rattle noise and the croak noise from being generated due to the increased clearance.

Further, by applying a lubricant to the contact portions 16 and 17, the contact portion 18 and the sliding portion on the carrier 7 side,
It is possible to reduce friction, smooth the movement of the pad 13, and prevent wear. Friction can be reduced by applying a film treatment such as Teflon treatment to the surface of these sliding portions.

The operation of the present embodiment configured as described above will be described below.

As shown in FIG. 1, when the rotation axis of the disk rotor 3 is tilted by an angle α and vertical wobbling occurs on the braking surface, the contact portion 16 of the convex portion 15 has a substantially arc-shaped cross section. Therefore, the pad 13 can be inclined to follow the braking surface of the disc rotor 3, and this allows the pad to be in a non-braking state.
A proper clearance can be maintained between 13 and the disc rotor 3.

Further, as shown in FIG. 7, when the rotation axis of the disc rotor 3 is tilted by an angle β and horizontal wobbling occurs on the braking surface, the cross-sectional shape of the contact portion 18 of the backing metal 14 is substantially circular. Since it has an arc shape, the pad 13 can be tilted following the braking surface of the disc rotor 3, whereby an appropriate clearance can be maintained between the pad 13 and the disc rotor 3 during non-braking.

As described above, even when surface wobbling occurs on the braking surface of the disk rotor 3, the pad 13 follows it so that an appropriate clearance can be maintained at all times during non-braking. It is possible to reduce drag due to surface wobbling and improve the fuel consumption rate.
Further, it is possible to prevent the judder phenomenon due to uneven wear of the disc rotor 3.

In the above-described embodiment, as an example, the present invention is applied to the pad 13 by fitting the convex portion 15 of the backing metal into the groove portion 10 of the carrier 7.
Was applied to the disc brake in which the braking torque is transmitted to the carrier 7 by the abutting portions 18 at both ends of the back metal 14, but as another embodiment,
For example, as shown in FIG. 8 to FIG.
It is also possible to have a structure in which the convex portions 21 formed at both ends of the pad are brought into contact with the torque receiving surface on the caliper side to guide the pad 19 by the convex portion 21 and transmit the braking torque to the carrier side.

Even in this case, the convex portion 21 of the back metal 20
The contact portions 22, 23 with the carrier side of the pad are substantially arcuate in cross section, and the pad 19 follows the inclination of the braking surface of the disk rotor to guide the back metal so that the back metal can be inclined with respect to the carrier. The same action and effect as the example are achieved.

In the above embodiment, the case where the present invention is applied to the caliper floating type disc brake is described as an example, but the present invention is not limited to this, and the pad is supported by the carrier. For example, the invention can be similarly applied to other types of disc brakes such as a caliper fixed type and an opposed piston type.

[0023]

As described above in detail, in the disc brake of the present invention, the abutment portion of the back metal with the carrier is formed in a substantially arcuate cross-section, and the pad is against the carrier and the braking surface of the disc rotor. Since the pad can be tilted along, the pad follows the surface runout of the disk rotor while tilting along the braking surface of the disk rotor. As a result, even if surface wobbling occurs on the braking surface of the disk rotor, the pad follows it, so that an appropriate clearance can always be maintained between the pad and the disk rotor during non-braking. It is possible to reduce drag due to surface wobbling of the rotor, improve the fuel consumption rate, and prevent the judder phenomenon due to uneven wear of the disk rotor.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a state in which a pad follows a disc rotor inclined in a vertical direction in a disc brake according to an embodiment of the present invention.

FIG. 2 is a front view of a disc brake pad according to an embodiment of the present invention.

FIG. 3 is a perspective view of a main part of the pad shown in FIG.

FIG. 4 is a vertical sectional view taken along the line AA of FIG.

5 is a cross-sectional view taken along the line BB of FIG.

6 is a cross-sectional view taken along the line CC of FIG.

FIG. 7 is an explanatory diagram showing a state in which the pad follows the disc rotor inclined in the horizontal direction in the disc brake according to the embodiment of the present invention.

FIG. 8 is a front view of a disc brake pad according to another embodiment of the present invention.

9 is a perspective view of a main part of the pad shown in FIG.

10 is a vertical cross-sectional view taken along the line DD of FIG.

11 is a cross-sectional view taken along the line EE of FIG.

FIG. 12 is a side view of a conventional disc brake.

[Explanation of symbols]

 3 Disc rotor 7 Carrier 13 Pad 14 Back metal 16,17,18 Contact part 19 Pad 20 Back metal 22,23 Contact part

Claims (1)

[Claims] 1. In a disc brake in which a back metal of a pad is slidably guided to a carrier, a cross-sectional shape of a contact portion of the back metal with the carrier is formed in a substantially arc shape, and the pad is relative to the carrier. The disc brake is characterized in that it can be tilted along the braking surface of the disc rotor.