JP2000081058A - Electric brake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain the transmission of a vibration generated in the action of a brake motor to a car body side effectively, on an electric brake device for generating the brake force by the power source of the brake motor. SOLUTION: A caliper 44 is fixed to a pin 46 supported to a mounting bracket 45 by a pin bolt 52 penetrating the installation hole 44a. An elastic member 54 is arranged so as to cover the installation hole 44a on the contact part of the caliper 44 with the pin bolt 52 and the contact part of the caliper 44 with the pin 46. The elastic member 54 absorbs the vibration of the caliper 44 effectively. The elastic member 50 is arranged on the opening of the pin groove 45a of the mounting bracket 45 and the elastic member 48 is arranged on the tip of the pin 46 respectively. The elastic members 48, 50 absorb the vibration of the pin 46.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake device, and more particularly to an electric brake device suitable for generating a braking force by using a brake motor as a power source.

[0002]

2. Description of the Related Art Conventionally, for example, International Patent Specification 96-
As disclosed in No. 3301, an electric brake device is known. The above-mentioned conventional device is provided with a disc brake. The disc brake includes an electric caliper having a built-in brake motor, and a disc rotor that rotates with wheels. The electric caliper includes a brake pad. When electric power is supplied from the outside, the brake motor presses the brake pad against the disk rotor and generates a force for clamping the disk rotor. Therefore, according to the above-mentioned conventional electric brake device, it is possible to electrically generate a braking force by appropriately driving the brake motor.

[0003]

When a brake motor is used as a power source of a brake device, the brake motor vibrates with a torque fluctuation every time the brake device operates. Further, even under a situation where the brake pad is pressed against the disk rotor, the brake motor vibrates due to the frictional force generated between the brake pad and the disk rotor. When the brake motor vibrates, the vibration may be transmitted to the vehicle body. For this reason, when a brake motor is used as a power source of the brake device, it is necessary to effectively suppress transmission of vibration generated during the operation to the vehicle body.

The present invention has been made in view of the above points, and has as its object to provide an electric brake device that effectively suppresses transmission of vibration generated during operation of a brake motor to a vehicle body. Aim.

[0005]

The above object is achieved by the present invention.
As described in, a rotating body that rotates with wheels, and a friction member that is pressed against the rotating body using a brake motor as a power source, a braking force is generated by friction between the rotating body and the friction member In the electric brake device to
This is achieved by an electric brake device characterized in that a vibration damping member is provided at a portion where the power of the brake motor is transmitted to the friction member.

In the present invention, a vibration damping member is provided at a portion where the power of the brake motor is transmitted to the friction member. Since the vibration damping member exists in the transmission path of the power of the brake motor, it absorbs vibration caused by friction between the rotating body and the friction member. Therefore, the transmission of the vibration caused by the friction to the brake motor side is suppressed. In addition, the object is to provide an electric brake device that generates a braking force by using a brake motor as a power source, wherein the brake motor and a fixing member that fixes the brake motor to a vehicle body side. This is achieved by an electric brake device in which a vibration damping member is provided therebetween.

In the present invention, a vibration damping member is provided between the brake motor and a fixing member for fixing the brake motor to the vehicle body. The vibration damping member absorbs vibration transmitted from the brake motor to the vehicle body. Therefore, transmission of the vibration of the brake motor to the vehicle body is suppressed.

[0008]

FIG. 1 is a system configuration diagram of an electric brake device according to a first embodiment of the present invention. The electric brake device according to the present embodiment includes an electronic control unit (hereinafter referred to as EC).
U (referred to as U). The electric brake device according to the present embodiment generates a braking force according to the brake operation amount under the control of the ECU 10.

The electric brake device according to the present embodiment includes a brake pedal 12. The brake pedal 12 is connected to a stroke simulator 16 via an operation shaft 14. When the brake pedal 12 is depressed by the driver, the operating shaft 14 enters the stroke simulator 16. The stroke simulator 16 generates a reaction force according to the amount of movement of the operation shaft 14. Therefore, a reaction force corresponding to the pedal stroke is generated on the brake pedal 12.

A stroke sensor 20 is provided on the operating shaft 14. The stroke sensor 20 outputs an electric signal corresponding to the pedal stroke. The output signal of the stroke sensor 20 is supplied to the ECU 10. EC
U10 detects a pedal stroke based on an output signal of the stroke sensor 20. Drivers 22 and 24 are connected to the ECU 10. The drivers 22 and 24 are connected to the positive terminal of the first battery 26 or the positive terminal of the second battery 28, respectively. The driver 22 has a brake motor 3 disposed on the right front wheel FR.
0 and a brake motor 3 disposed on the left rear wheel RL
2 are connected. On the other hand, a brake motor 34 disposed on the left front wheel FL and a brake motor 36 disposed on the right rear wheel RR are connected to the driver 24.

The drivers 22 and 24 include a first battery 26
Alternatively, it is a circuit for driving the brake motors 30 to 36 using the second battery 28 as a power supply source. Driver 22,
24 independently controls the brake motors 30 to 36 in accordance with command signals supplied from the ECU 10. Disc brakes 40 having brake motors 30 to 36 as power sources are arranged on the left and right front wheels FL, FR and the left and right rear wheels RL, RR. These disc brakes 40
Generates a braking force according to the operation state of the brake motors 30 to 36.

FIG. 2 is a perspective view of a disc brake 40 provided in the electric brake device according to the present embodiment. FIG. 3 is a sectional view of a portion where the caliper 44 of the disc brake 40 shown in FIG. 2 is fixed to the vehicle body. still,
FIG. 2 shows a disc brake 40 arranged on the right front wheel FR.
The structure is as follows. The disc brake 40 included in the electric brake device according to the present embodiment has no difference in configuration and operation. Therefore, hereinafter, only the configuration and operation of the disc brake 40 provided on the right front wheel FR will be described.

As shown in FIG.
Includes a disk rotor 42 that rotates with the wheels, a caliper 44 disposed on the outer periphery of the disk rotor 42, and a mounting bracket 45 fixed to a knuckle of the vehicle body. As shown in FIG. 3, the mounting bracket 45 is provided with a pin groove 45a for supporting the caliper 44. In the pin groove 45a,
The pin 46 is inserted. The pin 46 has a pin groove 45a.
Slidably supported by At the tip of the pin 46,
A cylindrical elastic member 48 is attached.

A cylindrical elastic member 50 is provided at the opening of the pin groove 45a of the mounting bracket 45 so as to be able to expand and contract in the axial direction. The elastic member 50 is made of, for example, a flexible material such as rubber, and has one end fixed to the inner diameter side of the opening of the mounting bracket 45 and the other end fixed to the pin 46. Elastic member 50
A sliding surface 50a that can abut the pin 46 is formed on the inner diameter side of. When the pin 46 slides in the pin groove 45 a, its outer peripheral portion is displaced while abutting on the sliding surface 50 a of the elastic member 50.

The caliper 44 has a mounting hole 44a. The caliper 44 is fastened to the pin 46 by a pin bolt 52 penetrating the mounting hole 44a. The caliper 44 is axially displaceably supported by a mounting bracket 45 fixed to a knuckle on the vehicle body side. A contact portion between the caliper 44 and the pin bolt 52;
An elastic member 54 is provided at a contact portion between the caliper 44 and the pin 46 so as to cover the mounting hole 44a.
The elastic member 54 is a cylindrical member having flange portions at both ends, and is made of a flexible material such as rubber, for example, like the elastic members 48 and 50.

In the above configuration, when the caliper 44 is displaced in the axial direction, the pin 46 is displaced in the pin groove 45a of the mounting bracket 45 accordingly. Therefore, the caliper 44 can be displaced in the axial direction with respect to the mounting bracket 45. FIG. 4 shows a disc brake 40 provided in the electric brake device of the present embodiment.
FIG.

As shown in FIG. 4, the caliper 44 has a mounting portion 44b. Mounting part 44 of caliper 44
The above-mentioned brake motor 30 is fixed to b.
The brake motor 30 includes a rotor 56 composed of a magnet,
And a DC motor including a stator 58 composed of a core and a coil. The motor shaft 60 is connected to the rotor 56. Motor shaft 60 of brake motor 30
Is a hollow rod-shaped member, which is rotatably supported by the caliper 44 via bearings 62 and 64. Between the bearing 64 and the caliper 44,
A cylindrical elastic member 65 is provided. The brake motor 30 rotates the motor shaft 60 by a magnetic field generated by appropriately supplying a motor current to the stator 58.

A roller screw 6 is provided in the hollow portion of the motor shaft 60.
A spindle 68 is screwed coaxially with the motor shaft 60 via the shaft 6. The spindle 68 is supported by a member formed on the mounting portion 44b so as to be non-rotatable and displaceable in the axial direction. Therefore, the spindle 68 is connected to the motor shaft 60.
Is displaced in the axial direction with the rotation of. According to the above configuration, the rotational motion of the brake motor 30 can be converted into the linear motion of the spindle 68 in the axial direction.

The caliper 44 has a pressing member 70 having a rod portion and a flange portion. The pressing member 70
The flange portion is supported by being connected to the mounting portion 44b via a seal member 72 made of an elastic body. The pressing member 70 is attached to the mounting portion 4 by the seal member 72.
A relative displacement in the axial direction with respect to 4b is allowed. The inner diameter portion of the spindle 68 is slidably inserted into the rod portion of the pressing member 70. An annular shim 73 is provided between the pressing member 70 and the spindle 68. The shim 73 is a member made of an elastic material such as resin or rubber. The pressing member 70 is displaced rightward in FIG. 4 by being pressed by the spindle 68.

The caliper 44 is provided on the brake pad 7.
4,76. The brake pads 74 and 76
It is a member made of a material having excellent wear resistance and heat resistance, and is supported by the mounting bracket 45 so as to be movable in the axial direction of the disk rotor 42. The brake pad 74 is disposed inside the vehicle body with respect to the disk rotor 42, and the brake pad 76 is disposed outside the vehicle body with respect to the disk rotor 42 so as to face the surface of the disk rotor 42. The brake pad 74 is displaced toward the disk rotor 42 by being pressed by the pressing member 70. Then, the brake pad 74 is pressed by the disk rotor 42.

When the brake pad 74 is pressed by the disk rotor 42, the mounting portion 44b of the caliper 44 is displaced leftward in FIG. On this occasion,
The caliper 44 is displaced relative to the mounting bracket 45. The mounting portion 44b of the caliper 44 has a claw portion 44b. The brake pad 76 is displaced toward the disk rotor 42 by being pressed by the claw portion of the mounting portion 44b of the caliper 44. And
The brake pad 76 is pressed by the disk rotor 42.

In the above configuration, the caliper 44 is supported by the mounting bracket 45 fixed to the vehicle body and fixes the brake motor 30. In addition, the caliper 44 has a function as a power transmission mechanism that transmits the power generated by the rotation of the brake motor 30 to the brake pads 74 and 76 pressed by the disk rotor 42.

In the disk brake 40 of the present embodiment, when the brake motor 30 is not operating, predetermined clearances are provided between the disk rotor 42 and the brake pad 74 and between the disk rotor 42 and the brake pad 76, respectively. Is secured. Under such circumstances,
When the motor shaft 60 of the brake motor 30 rotates, the spindle 68 is displaced in the axial direction.

When the spindle 68 is displaced to the right in FIG.
Abuts on the left side of the disk rotor 42 in FIG.
When the brake pad 74 comes into contact with the disk rotor 42, the brake pad 76 is displaced toward the disk rotor 42 by the reaction force, and comes into contact with the disk rotor 42. When the spindle 68 is further displaced rightward in FIG. 4, the brake pads 74 and 76 are pressed by the disk rotor 42 with a large force.

When the brake pads 74 and 76 are pressed by the disk rotor 42, a frictional force is generated therebetween.
Therefore, according to the disk brake 40 described above, it is possible to generate a braking force according to the operation state of the brake motor 30. Hereinafter, the rotation direction of the motor shaft 60 when the brake pads 74 and 76 are displaced toward the disk rotor 42 is referred to as “forward rotation”.

In a situation where the brake pads 74 and 76 are pressed against the disk rotor 42, the spindle 68
, The brake pad 74 is separated from the disk rotor 42. In this case, the reaction force from the disk rotor 42 disappears, so that the brake pad 76 is also separated from the disk rotor 42. In this case, the friction force generated between the brake pads 74 and 76 and the disk rotor 42 disappears. Therefore, according to the disk brake 40 described above, the braking of the vehicle can be released according to the operating state of the brake motor 30. Less than,
The rotation direction of the motor shaft 60 when the brake pads 74 and 76 are separated from the disk rotor 42 is referred to as “reverse rotation”.

When the vehicle is braked by using the brake motor 30 as a power source or when the brake is released, it is necessary to rotate the brake motor 30 forward or backward. However, when the brake motor 30 is operated in this way, the torque fluctuation causes the brake motor 30 to vibrate. When the brake pad 74 is pressed by the disk rotor 42,
The brake pad 74 vibrates due to friction during this time.
When the brake pad 74 vibrates, the vibration is transmitted via the pressure member 70 and the spindle 68 to the brake motor 30.
In this case as well, the brake motor 30 causes vibration.

When the brake motor 30 vibrates, the caliper 44 vibrates, and the pin bolt 52 fastening the caliper 44 to the pin 46 vibrates. When the pin bolt 52 vibrates, the pin 46 also vibrates in the pin groove 45a of the mounting bracket 45. Therefore, the vibration of the brake motor is transmitted to the vehicle body. Therefore, when the brake motor 30 is used as a power source, the vibration of the brake motor 30 and the vibration of the brake pad 74 during braking are effectively suppressed from being transmitted to the vehicle body via the brake motor 30. There is a need.

The electric brake device according to the present embodiment is characterized in that the above functions are realized. Hereinafter, the characteristic portions will be described. In this embodiment, as described above,
An annular shim 73 is provided between the pressing member 70 and the spindle 68. When the brake pad 74 is pressed by the disk rotor 42, the pressure member 70 vibrates due to the vibration of the brake pad 74. The shim 73 absorbs vibration of the pressing member 70. For this reason, according to the shim 73, when the brake pad 74 vibrates, the vibration can be suppressed from being transmitted to the spindle 68 via the pressing member 70.

If the vibration from the brake pad 74 to the spindle 68 is suppressed, the situation where the vibration of the brake pad 74 is transmitted to the brake motor 30 is avoided. Therefore, according to the electric brake device of the present embodiment, it is possible to suppress the vibration generated when the brake pad 74 is pressed by the disk rotor 42 from being transmitted to the vehicle body via the brake motor 30. .

In the present embodiment, as described above, the cylindrical elastic member 65 is disposed between the bearing 64 and the caliper 44. That is, the brake motor 30 → the caliper 44 → the mounting bracket 45 →
An elastic member 65 is provided in the path on the vehicle body side.
The elastic member 65 absorbs vibration of the motor shaft 60. For this reason, according to the elastic member 65, when the motor shaft 60 vibrates, the vibration can be suppressed from being transmitted to the caliper 44. Therefore, according to the present embodiment, the transmission of the vibration of the brake motor 30 to the vehicle body via the caliper 44 can be effectively suppressed.

In this embodiment, as described above, the contact portion between the caliper 44 and the pin bolt 52 and the caliper 4
An elastic member 54 is provided at a contact portion between the pin 4 and the pin 46 so as to cover the mounting hole 44a. The elastic member 54 absorbs vertical and horizontal vibrations of the caliper 44 in FIG. Therefore, according to the elastic member 54, when the caliper 44 vibrates, the vibration can be suppressed from being transmitted to the pin bolt 52 and the pin 46.
Therefore, according to the present embodiment, even when the vibration of the brake motor 30 is transmitted to the caliper 44, the transmission of the vibration to the vehicle body can be effectively suppressed.

In this embodiment, as described above, the elastic member 50 is provided in the opening of the pin groove 45a of the mounting bracket 45 on which the pin 46 slides. The elastic member 50 has a sliding surface 50 that can contact the pin 46.
a. The sliding surface 50 a of the elastic member 50 absorbs vibration on the head side of the pin 46. Even when vibration on the head side of the pin 46 is absorbed, the tip of the pin 46 is
It may come into contact with the inner wall of 5a. In this embodiment,
An elastic member 48 is provided at the tip of the pin 46. The elastic member 48 includes a pin groove 45a at the tip of the pin 46.
Absorbs the impact when abutting the inner wall of the car.

For this reason, according to the elastic members 48 and 50, the vibration of the pin 46 is reduced by the mounting bracket 45.
Can be reliably suppressed from being transmitted to the vehicle. Therefore, according to the present embodiment, even when the vibration of the brake motor 30 is transmitted to the pin 46 via the caliper 44, the transmission of the vibration to the vehicle body can be effectively suppressed.

Thus, according to the electric brake device of the present embodiment, the elastic members 48, 50, 54
And the mounting bracket 45, that is, the brake motor 30 → the caliper 44 → the mounting bracket 45 → provided in the path on the vehicle body side, the vibration of the brake motor 30 is transmitted to the vehicle body via the caliper 44 Can be effectively suppressed.

In the above embodiment, the disk rotor 42 is described in the "rotating body" described in the claims, the brake pad 74 is described in the "friction member" described in the claims, and the mounting bracket 45 is described in the claims. "Fixing member"
The elastic members 48, 50, 54, 65 and the shim 7
Reference numeral 3 corresponds to the “vibration damping member” described in the claims.

Next, an electric brake apparatus according to a second embodiment of the present invention will be described. The electric brake device of the present embodiment is realized by providing elastic members 82 and 84 instead of the elastic member 54 in the electric brake device of the first embodiment. FIG. 5 is a cross-sectional view of a main part of a portion where the caliper 44 included in the disc brake 80 of this embodiment is fixed to the vehicle body. In FIG. 5, the same components as those shown in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 5, the caliper 44 is fastened to the pin 46 by a pin bolt 52. Pin 46
An elastic member 82 is disposed between the head of the head and the caliper 44. The head of the pin bolt 52 and the caliper 4
4, an elastic member 84 is disposed so as to face the elastic member 82. The elastic members 82 and 84 are cylindrical members having a flange at one end, and are made of, for example, a flexible material such as rubber. The elastic members 82 and 84 have a separated structure.

The elastic members 82 and 84 absorb the vibration of the caliper 44. Therefore, according to the elastic members 82 and 84, when the caliper 44 vibrates, the vibration can be suppressed from being transmitted to the pin bolt 52 and the pin 46. Therefore, according to the present embodiment, similarly to the case of the first embodiment, even when the vibration of the brake motor 30 is transmitted to the caliper 44, the transmission of the vibration to the vehicle body is effectively suppressed. can do.

As described above, in the present embodiment, the elastic members 82 and 84 have a separated structure. In this embodiment, the procedure for fixing the caliper 44 to the pin 46 is as follows.
The elastic member 82 is mounted on the pin 46 side of the mounting hole 44 a of the caliper 44. The caliper 44 is disposed in the pin groove 45a. The elastic member 84 is attached to the mounting hole 44a on the head side of the pin bolt 52. Caliper 44 with pin bolt 52
Is fixed to the pin 46. According to the above procedures, the elastic members 82 and 84 can be easily assembled. Therefore, according to the present embodiment, it is possible to improve the assemblability of the elastic members 82 and 84 as compared with the case of the first embodiment.

In the above embodiment, the elastic member 8
2, 84 correspond to the "vibration damping member" described in the claims. By the way, in these embodiments, the shim 73 is provided between the pressing member 70 and the spindle 68 to suppress the transmission of vibration, but the present invention is not limited to this. , Instead of Shim 73,
Alternatively, transmission of vibration may be suppressed by disposing a member of the same quality as the shim 73 between the pressing member 70 and the brake pad 74 separately from the shim 73. In this case, this member corresponds to the “vibration damping member” described in the claims.

Further, the position where the elastic member is provided is not limited to the above-described embodiment, and the brake motor 3
0 → caliper 44 → mounting bracket → vehicle body side.

[0043]

As described above, according to the first aspect of the invention, it is possible to suppress the transmission of the vibration caused by the friction between the rotating body and the friction member to the brake motor. According to the second aspect of the present invention, it is possible to prevent the vibration of the brake motor from being transmitted to the vehicle body.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of an electric brake device according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a disc brake provided in the electric brake device according to the first embodiment of the present invention.

FIG. 3 is a sectional view of a portion where the caliper shown in FIG. 2 is fixed to a vehicle body side.

FIG. 4 is a sectional view of a disc brake provided in the electric brake device according to the first embodiment of the present invention.

FIG. 5 is a cross-sectional view of a main part of a portion where a caliper included in a disc brake according to a second embodiment of the present invention is fixed to a vehicle body side.

[Explanation of symbols]

 30-36 Brake motor 40,80 Disc brake 44 Caliper 45 Mounting bracket 46 Pin 48,50,54,82,84 Elastic member 52 Pin bolt 73 Shim

Claims (2)

[Claims] 1. A rotating body that rotates together with wheels, and a friction member pressed against the rotating body using a brake motor as a power source, and a braking force is generated by friction between the rotating body and the friction member. The electric brake device according to claim 1, wherein a vibration damping member is provided at a portion where the power of the brake motor is transmitted to the friction member. 2. An electric brake device that generates a braking force using a brake motor as a power source, wherein a vibration damping member is provided between the brake motor and a fixing member that fixes the brake motor to a vehicle body. An electric brake device characterized by the above-mentioned.