JPH08326800A - Disk brake - Google Patents

Abstract

PURPOSE: To miniaturize a disk brake and prevent partial wear of friction pads by providing a link mechanism pressing the friction pads into contact with a rotor by the opening/closing operation, and an anchor part receiving turning torque of the rotor applied on both friction pads. CONSTITUTION: Because an outer friction pad 14 is pressed into contact with a rotor 12 by opening/closing links 52, 54, 56, 58, claws or cylinders for pressing the outer friction pad 14 into contact with the rotor 12 are unnecessary, so as to attain miniaturization of a disk brake 10. An anchor part 44 is formed on the center in the thickness direction of the rotor 12, an outer friction pad 16 is pressed into contact with the rotor 12 based on the anchor part 44, and hence the outer friction pad 16 becomes in parallel with the rotor 12 so as to prevent partial wear from generating. In addition, because the friction pads 14, 16 are separated from the rotor 12 by return springs 60, 62 provided between the friction pads 14, 16, the friction pads 14, 16 are prevented from dragging.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake for generating a braking force by narrowing a rotor from both sides with friction pads.

[0002]

2. Description of the Related Art Conventional disc brakes are roughly classified into a fixed caliper type in which a caliper is fixed to a vehicle body and a floating caliper type in which the caliper is movably supported in the axial direction of a rotor. In the fixed caliper type disc brake, friction pads arranged on both sides of the rotor are pressed against the rotor by pistons of hydraulic cylinders provided on the outer side and the inner side of the caliper to obtain a braking force. On the other hand, the floating caliper type disc brake presses the inner friction pad against the rotor by the piston of the hydraulic cylinder provided on the inner side of the caliper.
By the reaction force, the caliper is moved to the inner side along the rotor shaft, and the caliper claws provided on the outer side of the caliper press the outer friction pad against the rotor to obtain the braking force. Then, in any of the disc brakes, when the braking operation is released, the friction pad is automatically returned by utilizing the restoring force of the elastic deformation of the seal provided on the inner peripheral surface of the cylinder, and the pad and the rotor are separated from each other. The gap is set to a predetermined value.

[0003]

However, in the conventional disc brake, when the outer side friction pad is pressed against the rotor, it is necessary to provide a cylinder or a claw on the outer side of the caliper, and the size becomes large on the outer side. Requires a large space. Further, in the conventional disc brake, the torque receiver (anchor part) for receiving the rotation torque of the rotor acting on the friction pad is formed on the support for guiding the friction pad in the rotor axial direction, and the anchor part is arranged in the axial direction of the rotor. Since it is lateral and does not coincide with the center position in the thickness direction of the rotor, the rotor entry side of the friction pad may tilt toward the rotor side, and the friction pad may wear unevenly.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to enable downsizing. Another object of the present invention is to prevent uneven wear of the friction pad.

[0005]

In order to achieve the above object, in a disc brake according to the present invention, friction pads disposed on both sides of a rotating rotor are pressed against the rotor by a hydraulic device to obtain a braking force. In a disc brake, a link mechanism that connects both friction pads and presses the friction pads against the rotor by an opening / closing operation, and a rotation torque of the rotor that is formed on a rotary node portion of the link mechanism and that acts on the friction pads. And an anchor portion for receiving. The anchor portion may be formed at a position corresponding to the center position of the outer peripheral edge of the rotor in the thickness direction. A return spring is provided between the friction pads to open the link mechanism to separate the friction pads from the rotor. The spring force of this return spring is derived from the deformation resistance of the seal provided on the inner peripheral surface of the cylinder that constitutes the hydraulic device arranged on the back surface of one of the friction pads or on the outer peripheral surface of the piston that slides in the cylinder. Set smaller.

Further, the disc brake according to the present invention is a disc brake in which friction pads arranged on both sides of a rotating rotor are pressed against the rotor to obtain a braking force.
A bracket fixed to the vehicle body, provided on one side of the bracket in the circumferential direction of the rotor, extending in a direction orthogonal to the rotor axis, and the center position in the width direction corresponds to the center position in the thickness direction of the outer peripheral edge of the rotor. A guide part, an anchor part provided on the other side of the bracket in the circumferential direction of the rotor, and a center position of which corresponds to the center position in the thickness direction of the outer peripheral edge of the rotor, and a slider which moves along the guide part. A first link mechanism that is openably and closably attached to the friction pads, and an opening-side tip is pivotally attached to the friction pads; and an opening-side tip is pivotally attached to the friction pads. A certain second link mechanism, and a hydraulic device attached to the bracket, which presses one of the friction pads to close the two link mechanisms to press the two friction pads against the rotor. It has a return spring provided between both friction pads to open both link mechanisms, and the spring force of the return spring is smaller than the deformation resistance of the seal provided on the inner peripheral surface of the cylinder of the hydraulic device. It has the set configuration.

[0007]

According to the present invention constructed as described above, the friction pads arranged on both sides of the rotor are brought into pressure contact with the rotor by the link mechanism capable of opening and closing the legs, so that the claw for pressing the friction pad on the outer side and It is not necessary to provide a cylinder, the disc brake can be downsized, and the space required on the outer side can be reduced. Further, since the anchor portion that receives the rotation torque of the rotor acting on the friction pad is provided at a position corresponding to the center position in the thickness direction of the rotor, the friction pad is pressed against the rotor with the center in the thickness direction of the rotor as a reference. And then
The friction pad becomes parallel to the rotor to prevent uneven wear. Furthermore, by providing a return spring between both friction pads, the return spring separates the friction pad from the rotor when the braking operation is released, so that dragging of the pad is prevented and noise and uneven wear of the pad are prevented. Can be prevented. Moreover, since the spring force of the return spring is set to be smaller than the deformation resistance of the seal provided on the cylinder or the piston, the adjusting function of the friction pad by the seal is not impaired.

Further, in the present invention, since the link mechanism is provided on one side in the rotor circumferential direction and on the other side in the rotor circumferential direction of the friction pad, the friction pad can be easily and reliably pressed in parallel with the rotor. The uneven wear of the pad can be prevented more reliably. Moreover, since both link mechanisms are attached to the anchor portion provided on the bracket to which the cylinder is attached and the slider guided by the guide portion to support the friction pad, the friction pad is supported and guided in the rotor axial direction. No support is required, and the structure can be simplified and the weight can be reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a disc brake according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a plan view of a disc brake according to an embodiment of the present invention.

In FIG. 1, the disc brake 10 is
An outer friction pad 14 and an inner friction pad 16 are provided on both axial sides of the rotor 12 that rotates with a wheel (not shown).
And are placed. Each friction pad 14, 16 has a back metal 1
8 and 20 and friction materials 22 and 24 attached to the front surfaces of the backing metals 18 and 20 facing the rotor 12, and the friction materials 22 and 24 are in pressure contact with the rotor 12. Further, the back metal 20 of the inner friction pad 16
On the back side of each friction pad 1, as will be described later in detail.
A piston 26, which constitutes a hydraulic device for pressing the rotors 4 and 16 against the rotor 12, is provided.

The piston 26 is inserted in a cylinder 28 to which pressure oil is supplied from a master cylinder (not shown), and is movable in the cylinder 28 in the rotor axial direction. A seal 30 with which the piston 26 slides is provided on the inner peripheral surface of the cylinder 28 on the tip opening side.
The pressure oil supplied to the cylinder 28 is prevented from leaking from the tip opening. Also, this seal 30 is used for the piston 2
6 is elastically deformed when it advances toward the rotor 12 as indicated by an arrow 32, and its restoring force constitutes an adjusting mechanism that returns and holds the piston 26 to a predetermined non-braking position.

As shown in FIG. 2, the cylinder 28 is fixed to a bracket 36 attached to an axle case (not shown) through which the axle 34 extends. The bracket 36 has a pair of arms 38 and 40 extending from the boss portion 37 toward the outer peripheral edge portion of the rotor 12, and has a substantially V-shape when viewed from the direction of the axle 34. Further, as shown in FIG. 1, each arm 38, 40 has a tip portion extending outward from the peripheral surface of the rotor 12. Then, the rotor entrance side during forward movement, which is one side in the rotor circumferential direction (left side in FIG. 2)
A guide block 42 is formed at the tip of the arm 38, and an anchor portion 44, which will be described in detail later, is provided at the tip of the arm 40 on the other side in the rotor circumferential direction.

As shown in FIG. 1, the guide block 42 is provided with an oblong guide hole 46 as a guide portion, which is orthogonal to the rotor axis so as to be parallel to the rotor 12. The center of the guide hole 46 in the width direction is the rotor 1
The slider 50 is located at a position corresponding to the center of the thickness direction 2 and is moved inside as shown by an arrow 48. The slider 50 is supported by the guide block 42 through a groove (not shown) provided on the inner peripheral surface of the guide hole 46 and penetrates the guide hole 46, and the outer friction pad 14 and the inner friction pad 14 are formed in the upper and lower portions. Back metal with friction pad 16 1
One end of the rotors 8 and 20 is pivotally connected to the rotor entry side (the left side of FIG. 1), and the other ends of the links 52 and 54, which are the first link mechanism, are pivotally connected. Link 5
The sliders 50 move in the guide holes 46 as indicated by arrows 48 by opening and closing the legs 2 and 54, and the friction pad 1
The friction members 22 and 24 of 4 and 16 are pressed against and separated from the rotor 12.

On the other hand, the back metal 1
The other ends of the links 56 and 58, which are the rotation nodes, of the second link mechanism, of which one end is pivotally connected to the rotor feeding side of 8, 20 are pivotally connected. Therefore, the friction pads 14, 16 are supported by the guide block 42 on the inflow side via the links 52, 54 and the slider 50, and on the outflow side in the links 56, 58.
It is supported by the anchor portion 44 via. Further, between the backing plates 18 and 20, return springs 60 and 62 formed in a V shape are provided on the rotor entry side and the rotor entry side, respectively. These return springs 60, 62 are
When the braking operation is released and the hydraulic pressure of the cylinder 28 is released, the link 5 is urged to separate the links 5 and 4 from each other.
2 and 54 and links 56 and 58 are opened to rub pad 1
4, 16 are separated from the rotor 12. The spring force of the return springs 60 and 62 is set to be smaller than the deformation resistance of the seal 30 so that the adjusting function of the seal 30 is not impaired.

Backing plates 18, 20 and links 52, 54, 5
6, 58 is connected to the side surface of the backing metal 20 by the cylindrical body 61, as shown in FIG. 3 as an example of the connection between the backing metal 20 and the link 58.
63 is fixed in the vertical direction in the figure by welding or the like. A shaft 64 is rotatably inserted into the cylindrical bodies 61 and 63, and links 58 are fixed to both ends of the shaft 64. On the other hand, the anchor portion 44 is composed of a columnar anchor block 66 and an anchor bolt 68 as shown in FIG. 4, and the center of the anchor bolt 68 coincides with the center of the peripheral portion of the rotor 12 in the thickness direction. Is done. Further, connecting rings 70 and 72 are fixed to the other ends of the links 56 and 58 on the side of the anchor portion 44, and these rings 70 and 72 are attached to the anchor block 66 by an anchor bolt 68 as shown by an arrow 74. It is rotatably screwed. A vertical bent portion is formed at an end portion of the link having the upper connecting ring (link 56 in the case of the embodiment) close to the connecting ring 70, and the vertical direction depends on the thickness of the connecting rings 70 and 72. I am trying to absorb the position shift.

The operation of the embodiment constructed as described above is as follows. When a brake pedal (not shown) is stepped on and pressure oil is supplied from the master cylinder to the cylinder 28, the piston 26 slides on the seal surface while elastically deforming the seal 30 and moves forward toward the rotor 12, and the inner friction pad 16 is pressed against the rotor 12. At this time, the inner friction pad 16 rotates the link 54 in the counterclockwise direction about the slider 50, rotates the link 58 in the clockwise direction about the anchor bolt 68, and
With the rotation of 8 in the clockwise direction, it moves to the left in FIG. Then, the inner friction pad 16 moves the slider 50, which is inserted into the guide hole 46 of the guide block 42 via the link 54 connected to the back metal 20, to the left in FIG. 1 to move the links 52, 54 and the link 56, 58 and 58 are closed to reduce the spread leg angles α and β. Therefore, link 5
The outer friction pad 14 connected to the rotors 2, 56 moves in the rotor axial direction as indicated by the arrow 76 in FIG.
It is pressed against 2. Further, the rotational torque of the rotor 12 received by each of the friction pads 14 and 16 is transmitted to the anchor portion 44 via the links 56 and 58 on the rotor opening side, is absorbed by the bracket 36 fixed to the vehicle body, and the braking force is increased. appear.

On the other hand, when the braking operation is released, the cylinder 28
When the hydraulic pressure is released, the return springs 60 and 62 open the links 52 and 54 and the links 56 and 58 to separate the friction pads 14 and 16 from the rotor 12. Since the spring force of the return springs 60 and 62 is set to be smaller than the resistance to the elastic deformation of the seal 30, each friction pad 14 and 16 is held in a predetermined non-braking position by the adjusting function of the seal 30. Pads 14 and 16 and rotor 12
The gap between and is maintained at a predetermined value.

As described above, in the embodiment, the link 5 is used.
Since the outer friction pad 14 is brought into pressure contact with the rotor 12 by opening / closing 2, 54, 56, 58, a claw or a cylinder for bringing the outer friction pad 14 into pressure contact with the rotor 12 is not required, and the disc brake is small in size. Can be realized. Further, in the embodiment, the anchor portion 44
Is formed in the center of the rotor 12 in the thickness direction, and the outer friction pad 16 is pressed against the rotor 12 with the anchor portion 44 as a reference, so that the outer friction pad 14 becomes parallel to the rotor 12 and uneven wear is prevented. Can be prevented. Further, in the embodiment, the return springs 60 and 62 provided between the friction pads 14 and 16 are used.
Is separated from the rotor 12, it is possible to prevent the friction pads 14 and 16 from being dragged, and it is possible to prevent noise and uneven wear of the pads. Further, in the embodiment, since the friction pads 14 and 16 are supported by the links 52, 54, 56 and 58, a support for guiding the friction pads 14 and 16 in the rotor axial direction is not required, and the brake is small and lightweight. Can be realized.

[0019]

As described above, according to the present invention, the friction pads arranged on both sides of the rotor are pressed against the rotor by the link mechanism capable of opening and closing the legs. It is not necessary to provide a claw or a cylinder for pressing, the size of the disc brake can be reduced, and the space required on the outer side can be reduced. Further, since the anchor portion that receives the rotation torque of the rotor acting on the friction pad is provided at a position corresponding to the center position in the thickness direction of the rotor, the friction pad is pressed against the rotor with the center in the thickness direction of the rotor as a reference. As a result, the friction pad becomes parallel to the rotor and uneven wear can be prevented. Furthermore, by providing a return spring between both friction pads, the return spring separates the friction pad from the rotor when the braking operation is released, so that dragging of the pad is prevented and noise and uneven wear of the pad are prevented. Can be prevented. Moreover, since the spring force of the return spring is set to be smaller than the deformation resistance of the seal provided on the cylinder or the piston, the adjusting function of the friction pad by the seal is not impaired.

Further, in the present invention, since the friction pad is provided with the link mechanism on one side in the rotor circumferential direction and on the other side in the rotor circumferential direction, the friction pad can be easily and reliably pressed in parallel with the rotor. The uneven wear of the pad can be prevented more reliably. Moreover, since both link mechanisms are attached to the slider and the anchor portion that are guided by the guide portion provided on the bracket to which the cylinder is attached to support the friction pad, the support that supports the friction pad and guides it in the rotor axial direction is provided. It is possible to simplify the structure and reduce the weight without requiring.

[Brief description of drawings]

FIG. 1 is a plan view of a disc brake according to an embodiment of the present invention.

FIG. 2 is a side view of the disc brake according to the embodiment as viewed from the inner side.

FIG. 3 is a perspective view showing an embodiment of a connection structure of a pad back metal and a link.

FIG. 4 is a perspective view showing an embodiment of a connecting structure of an anchor portion and a link.

[Explanation of symbols]

 10 Disc Brake 12 Rotor 14 Outer Friction Pad 16 Inner Friction Pad 18, 20 Back Metal 26, 28 Hydraulic Device (Piston, Cylinder) 30 Seal 44 Anchor Part 46 Guide Part (Guide Hole) 50 Slider 52, 54 First Link Mechanism ( Link) 56, 58 Second link mechanism (link) 60, 62 Return spring

Claims (4)

[Claims] 1. In a disc brake, wherein friction pads arranged on both sides of a rotating rotor are pressed against the rotor by a hydraulic device to obtain a braking force, the friction pads are connected to the rotor by an opening / closing operation. A disc brake, comprising: a link mechanism that is in pressure contact with the link mechanism; and an anchor portion that is formed at a rotary node portion of the link mechanism and receives the rotational torque of the rotor that acts on the friction pads. 2. The disc brake according to claim 1, wherein the anchor portion is formed at a position corresponding to a center position in the thickness direction of the outer peripheral edge portion of the rotor. 3. The hydraulic device has a cylinder arranged on the back side of one of the friction pads and a piston that slides in the cylinder and presses the one friction pad. Is provided with a return spring that opens the link mechanism, and the spring force of the return spring is set to be smaller than the deformation resistance of the seal provided on the inner peripheral surface of the cylinder or the outer peripheral surface of the piston. The disc brake according to claim 1 or 2, which is characterized. 4. In a disc brake, wherein friction pads arranged on both sides of a rotating rotor are pressed against the rotor to obtain a braking force, a bracket fixed to the vehicle body and a rotor shaft provided on one side of the bracket in the rotor circumferential direction. A guide portion that extends in a direction orthogonal to, and has a center position in the width direction corresponding to a center position in the thickness direction of the outer peripheral edge portion of the rotor, and is provided on the other side of the bracket in the rotor circumferential direction. The rotor is attached to the anchor portion corresponding to the center position in the thickness direction of the outer peripheral edge of the rotor and the slider that moves along the guide portion so as to be openable and closable, and the tip end on the opening side is pivotally attached to both the friction pads. A first link mechanism, a second link mechanism that is attached to the anchor portion so as to be openable and closable, and an opening side tip is pivotally attached to the friction pads, and is attached to the bracket; A hydraulic device that presses one of the friction pads to close the two link mechanisms to press the two friction pads against the rotor, and a return device that is provided between the two friction pads and opens the two link mechanisms. Has a spring and
A disc brake, wherein the spring force of the return spring is set to be smaller than the deformation resistance of a seal provided on the inner peripheral surface of the cylinder of the hydraulic device.