JP2000304077A - Brake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the reliability of fail-safe operation in the generation of an abnormality of an electric system including an electric driving mechanism with a simple and inexpensive structure by imparting a driving force to a friction mechanisms by the electric driving mechanism and a hydraulic driving mechanism, respectively, so as to generate the driving force according to the operating force of a brake pedal. SOLUTION: When an abnormality occurs in an electric system such as an operating force sensor 2, a control unit 8, an electric driving mechanism 6, etc., current is carried to the solenoid 9d of a solenoid opening and closing valve 9 to open a valve element 9b against a spring 9c. When a brake pedal 1 is then operated, the hydraulic pressure of a master cylinder 3 generated according to the operating force is pressed into the sealed oil chamber 7d of a driving force transmitting mechanism 7 through the valve element 9b, and a driving force is generated in the direction of extending both pistons 7b, 7c thereof. Therefore, the driving force according to the hydraulic pressure of the master cylinder 3 is transmitted to a friction mechanism 5, and both disc pads 5a, 5b thereof are driven in the direction of being pressed to a disc rotor 4 to impart a braking force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake device driven by an electric drive device, and more particularly to a fail-safe technique when an electric system is abnormal.

[0002]

2. Description of the Related Art Conventionally, as a brake device driven by an electric drive device, for example, Japanese Patent Application Laid-Open No. 8-312701 is disclosed.
An "electrically actuated brake device" described in Japanese Unexamined Patent Publication (Kokai) No. H10-264, is known. The conventional electrically operated brake device includes a pedaling force sensor that detects a pedaling force of a brake pedal, a disk rotor that rotates integrally with the wheel, and a wheel driven by a frictional force by being driven in a direction in which the disk rotor is pressed against the disk rotor. A friction mechanism that applies a braking force to rotation, an electric motor that drives the friction mechanism, a pressing force sensor that detects a pressing force by the friction mechanism, and a pressing force detected by the pressing force sensor is detected by a treading force sensor. And an electronic control unit that controls the driving of the electric motor until the pressing force is in accordance with the depressing force.

[0003]

However, in the above-mentioned "electrically actuated brake device" of the prior art, since the friction mechanism is driven by an electric actuator such as an electric motor, there are the following problems. Was. That is, if a failure occurs in an electric system such as an electric wiring connecting the treading force sensor and the electronic control circuit or between the electronic control circuit and the electric motor, or a power supply wiring to the electronic control circuit, the brake pedal can be depressed. Since the brake device does not operate, it is indispensable to add an electric fail-safe mechanism in preparation for the occurrence of an abnormality in the electric system, but the electric fail-safe mechanism is expensive. Further, 100% complete fail-safe cannot be expected with an electric fail-safe, so that the reliability of the fail-safe operation is poor.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems. It is an object of the present invention to improve the reliability of fail-safe operation when an abnormality occurs in an electric system while suppressing an increase in cost with a simple configuration. It is an object of the present invention to provide a brake device capable of performing the following.

[0005]

According to a first aspect of the present invention, there is provided a brake device comprising: a brake pedal; a master cylinder for generating a hydraulic pressure in accordance with a depression force of the brake pedal; A pedaling force detecting means for detecting a pedaling force, a contact member that rotates integrally with the wheel, a friction mechanism that applies a braking force to the rotation of the wheel by a frictional force by being driven in a direction of pressing against the contact member; An electric drive mechanism for driving a friction mechanism; control means for outputting a drive signal to the electric drive mechanism to generate a drive force corresponding to the depression force of the brake pedal detected by the depression force detection means; And a hydraulic drive mechanism for driving the friction mechanism with the hydraulic pressure to be applied.

According to a second aspect of the present invention, in the brake device according to the first aspect, the hydraulic drive mechanism is provided between two movable partition walls interposed between the friction mechanism and the electric drive mechanism. The driving force of the electric drive mechanism is transmitted to the friction mechanism via oil filled in the formed closed oil chamber, and the closed oil chamber and the master cylinder are connected by a hydraulic circuit. A normally closed solenoid on-off valve for opening and closing the hydraulic circuit was provided in the middle of the hydraulic circuit.

According to a third aspect of the present invention, in the brake device according to the first aspect, the hydraulic drive mechanism is provided between two movable partition walls interposed between the friction mechanism and the electric drive mechanism. The driving force of the electric drive mechanism is transmitted to the friction mechanism via oil filled in the formed closed oil chamber, and the closed oil chamber and the master cylinder are connected by a hydraulic circuit. An on-off valve that opens and closes the hydraulic circuit is interposed in the middle of the hydraulic circuit. The on-off valve has a valve port disposed on the master cylinder side and a valve element disposed on the closed oil chamber side, and a valve element is disposed at a predetermined position. The urging means is provided with an urging means for urging in a direction in which it comes into pressure contact with the valve port with the force of.

According to a fourth aspect of the present invention, there is provided the brake device according to the first aspect, wherein the electric drive mechanism and the hydraulic drive mechanism are provided in parallel, and respective driving forces independently act on the friction mechanism. Means configured to be used.

According to a fifth aspect of the present invention, in the brake device according to the first aspect, the electric drive mechanism is provided between the hydraulic drive mechanism and the friction mechanism, and the driving force of the hydraulic drive mechanism is reduced. The means is configured to act on the friction mechanism via a drive section of the electric drive mechanism.

According to a sixth aspect of the present invention, in the brake device of the first aspect, a driving force acts on the friction mechanism independently of the electric drive mechanism in a predetermined initial stroke range of the hydraulic drive mechanism. Then, the driving force of the hydraulic drive mechanism is applied to the friction mechanism via the drive unit of the electric drive mechanism when the drive force exceeds a predetermined initial stroke range.

According to a seventh aspect of the present invention, in the brake device according to the second aspect, the solenoid on-off valve has a valve port disposed on the master cylinder side and a valve element disposed on the closed oil chamber side. The means includes an urging means for urging the body in a direction of pressing against the valve port with a predetermined force, and a solenoid for driving the valve body in the valve opening direction against the urging force of the urging means.

In the brake device according to an eighth aspect of the present invention, in the brake device according to the second or seventh aspect, abnormality detection means for detecting an abnormality in an electric system related to the operation of the electric drive mechanism, and the abnormality detection means Fail-safe control means for driving the electromagnetic on-off valve in a direction to open the valve when an abnormality in the electric system is detected;

According to a ninth aspect of the present invention, in the brake device according to any one of the second, third, seventh and eighth aspects, at least one of the movable partition walls is constituted by a piston that slides in a cylinder. Means.

According to a tenth aspect of the present invention, in the brake device according to the second aspect, at least one of the movable partition walls is constituted by a diaphragm.

[0015] According to an eleventh aspect of the present invention, in the brake device according to any one of the second to third aspects, at least one of the movable partition walls is constituted by a bellows.

According to a twelfth aspect of the present invention, in the brake device according to any one of the first to eleventh aspects,
The contact member is constituted by a disk rotor.

[0017]

The brake device according to the first aspect of the present invention is configured as described above, so that when the brake pedal is depressed,
The treading force is detected by the treading force detecting means, and the control means outputs a drive signal to the electric drive mechanism to generate a driving force according to the treading force, while the electric drive mechanism applies a driving force to the friction mechanism, Also in the hydraulic drive mechanism, it is possible to apply a driving force to the friction mechanism by the hydraulic pressure generated in the master cylinder. Therefore, when an abnormality occurs in the electric system in which a failure has occurred in the electric system such as the electric wiring connecting between the treading force detecting means and the control means or between the control means and the electric drive mechanism, or the power supply wiring to the control means. In addition, the hydraulic drive mechanism can apply a driving force to the friction mechanism with the master cylinder oil pressure according to the depression force of the brake pedal, thereby driving the friction mechanism in a direction in which the friction mechanism is pressed against the contact member of the wheel. Thus, a braking force is applied to the rotation of the wheel.

In the brake device according to the second aspect of the present invention, the driving force generated by the electric driving mechanism is transmitted to the closed oil chamber formed between the two moving partitions constituting the hydraulic driving mechanism. The friction is transmitted to the friction mechanism via the filled oil, whereby the friction mechanism is driven in a direction in which the friction mechanism is pressed against the contact member of the wheel, whereby a braking force is applied to the rotation of the wheel by the friction force. In addition, when an abnormality occurs in the electric system, the normally closed solenoid on-off valve is driven in a direction to open, so that the master cylinder oil pressure according to the depression force of the brake pedal passes through the hydraulic circuit through the solenoid on-off valve. Is press-fitted into a sealed oil chamber formed between two movable partition walls constituting a hydraulic drive mechanism, and the hydraulic pressure generates a driving force in a direction of expanding between the two movable partition walls. The driving force according to is transmitted,
As a result, a braking force is applied to the rotation of the wheel.

In the brake device according to the third aspect of the present invention, the driving force generated by the electric driving mechanism is transmitted to the closed oil chamber formed between the two movable partition walls constituting the hydraulic driving mechanism. The friction is transmitted to the friction mechanism via the filled oil, whereby the friction mechanism is driven in a direction in which the friction mechanism is pressed against the contact member of the wheel, whereby a braking force is applied to the rotation of the wheel by the friction force. Also, when an abnormality occurs in the electric system, the master cylinder oil pressure acts in a direction to open the valve element of the on-off valve against the urging force of the urging means, so that it depends on the depression force of the brake pedal as described above. The friction mechanism is driven by the master cylinder hydraulic pressure, and a braking force is applied to the rotation of the wheel.

In the brake device according to the fourth aspect, as described above, the electric drive mechanism and the hydraulic drive mechanism are provided in parallel, and the respective drive forces independently act on the friction mechanism. The driving force of the mechanism is not affected by the driving force of the electric driving mechanism, whereby the driving force control by the electric driving mechanism according to the pedaling force signal of the brake pedal is performed accurately and easily. In addition, when an abnormality occurs in the electric system, a driving force can be applied to the friction mechanism by the master cylinder oil pressure according to the depressing force of the brake pedal by the hydraulic driving mechanism, whereby the friction mechanism is pressed against the contact member of the wheel. The braking force is applied to the rotation of the wheel by driving in the direction in which the wheel is driven.

According to a fifth aspect of the present invention, as described above, the electric drive mechanism is provided between the hydraulic drive mechanism and the friction mechanism, and the driving force of the hydraulic drive mechanism is controlled by the electric drive mechanism. Acting on the friction mechanism via the drive unit, the drive force of the hydraulic drive mechanism is not affected by the drive force of the electric drive mechanism even if both mechanisms are arranged in series, and this allows the brake pedal to operate. Driving force control by the electric driving mechanism according to the treading force signal is accurately and easily performed. Further, when an abnormality occurs in the electric system, the driving force can be transmitted to the friction mechanism via the driving unit of the electric driving mechanism with the master cylinder oil pressure according to the depression force of the brake pedal by the hydraulic driving mechanism. By driving the friction mechanism in the direction of pressing against the contact member of the wheel, a braking force is applied to the rotation of the wheel by the frictional force.

In the brake device according to the sixth aspect, as described above, in the predetermined initial stroke range of the hydraulic drive mechanism, a driving force acts on the friction mechanism in parallel and independently of the electric drive mechanism. The driving force of the hydraulic driving mechanism is not affected by the driving force of the electric driving mechanism, whereby the driving force control by the electric driving mechanism according to the pedaling force signal of the brake pedal is performed accurately and easily. Also, when an abnormality occurs in the electric system, the driving force can be transmitted to the friction mechanism by the master cylinder oil pressure according to the depression force of the brake pedal by the hydraulic driving mechanism, whereby the friction mechanism is connected to the contact member of the wheel. By driving in the direction of pressing, a braking force is applied to the rotation of the wheel by frictional force. When it is desired to reduce the hydraulic pressure input from the brake pedal as in the case of the ABS control or the like, the drive unit of the electric drive mechanism is retracted to make the sum of the driving forces of the electric drive mechanism and the hydraulic drive mechanism zero. be able to.

In the brake device according to the present invention, when an abnormality occurs in the electric system, the solenoid can be driven in a direction to open the valve body by energizing the solenoid of the solenoid on-off valve. Even in the case where the state becomes impossible, the master cylinder oil pressure acts in the direction to open the valve body of the solenoid on-off valve against the urging force of the urging means, so that the master cylinder pressure corresponding to the depression force of the brake pedal Cylinder oil pressure is passed through a hydraulic circuit, passes through an electromagnetic on-off valve, and is press-fitted into a sealed oil chamber formed between two movable partition walls in the driving force transmission mechanism. Since a driving force is generated, a driving force corresponding to the master cylinder oil pressure is transmitted to the friction mechanism, and thereby a braking force is applied to the rotation of the wheel.

In the brake device according to the present invention, when an abnormality in the electric system related to the operation of the electric drive mechanism is detected by the abnormality detecting means, the fail-safe control means drives the electromagnetic on-off valve in a direction to open the valve. Accordingly, as described above, the friction mechanism is driven by the master cylinder oil pressure according to the depression force of the brake pedal, and a braking force is applied to the rotation of the wheel.

[0025]

Embodiments of the present invention will be described below in detail with reference to the drawings. (First Embodiment of the Invention) FIG. 1 is a longitudinal sectional view showing a brake device according to a first embodiment of the present invention, and FIG. 2 is an enlarged sectional view showing a main part of the brake device according to the first embodiment of the present invention. , In both figures, 1 is a brake pedal,
2 is a tread force sensor (treading force detecting means) for detecting the treading force of the brake pedal 1, 3 is a master cylinder that generates a hydraulic pressure according to the treading force of the brake pedal 1, and 4 is a disk rotor (contact) that rotates integrally with the wheel. Members), 5
A friction mechanism, 6 is an electric drive mechanism for driving the friction mechanism 5,
Reference numeral 7 denotes a hydraulic drive mechanism that also serves as a drive force transmission mechanism for transmitting the drive force of the electric drive mechanism 6 to the friction mechanism 5, reference numeral 8 denotes a control unit, and reference numeral 9 denotes a normally closed electromagnetic on-off valve.

More specifically, the friction mechanism 5 includes two disk pads 5a, 5b with respect to the disk rotor 4.
Is driven in the direction of pinching and pressing from both sides to apply a braking force to the rotation of the wheel by frictional force. One disc pad 5a is fixed to the tip side of the caliper 5c, and the other disc pad 5b is described later. Is fixed to the piston 7b.

In the first embodiment of the present invention, the electric drive mechanism 6 uses an induction motor. That is, in this induction motor, a casing 6c to which an annular stator 6b around which a coil 6a is wound is fixed is fixed to the base end side of the caliper 5c, and a cylindrical rotor is provided at the axial center of the stator 6b. 6d is rotatably supported by a casing 6c via a bearing 6e.

In a ball screw hole formed in the axis of the rotor 6d, a ball screw shaft (drive unit) 11 to which the rotational motion of the rotor 6d is converted and transmitted as a linear motion via a ball screw mechanism 10. Is provided.

The hydraulic drive mechanism 7 also serving as the drive force transmission mechanism includes a cylinder 7a formed in a caliper 5c between the friction mechanism 5 and the electric drive mechanism 6, and a cylinder 7a
Two pistons (movable bulkheads) slidably provided inside
7b and 7c, and oil contained in a sealed oil chamber 7d formed between the pistons 7b and 7c. One piston 7b is fixed to the disk pad 5b as described above, and the other piston 7b is fixed to the disk pad 5b. Of the ball screw shaft 1
Fixed to 1. In the figure, reference numeral 7e denotes a sliding seal member.

The control unit 8 is a control means for outputting a drive signal to the electric drive mechanism 6 so as to generate a drive force corresponding to the depression force of the brake pedal 1 detected by the depression force sensor 2, and the operation of the electric drive mechanism 6. Abnormality detecting means for detecting an abnormality in the electric system related to the above, and fail-safe control means for driving the electromagnetic opening / closing valve 9 in a direction to open when the abnormality detecting means detects an abnormality in the electric system. I have.

The solenoid on-off valve 9 is a hydraulic pipe (hydraulic circuit) 1 connecting the master cylinder 3 and the sealed oil chamber 7d.
2 of the first embodiment of the present invention.
In this example, it is assembled to the caliper 5c. That is, as shown in an enlarged sectional view of FIG.
A spring (biasing means) is provided in which the valve port 9a is disposed on the master cylinder 3 side and the valve element 9b is disposed on the sealed oil chamber 7d side, and also urges the valve element 9b in a direction of pressing against the valve port 9a with a predetermined force.
9c and a solenoid 9d for driving the valve body 9a in the valve opening direction against the urging force of the spring 9c.

FIG. 3 is a schematic configuration diagram of the brake device according to the first embodiment of the present invention, and FIG. 4 is a model diagram of the force. As shown in both figures, the embodiment of the present invention is shown in FIGS. 1
In the brake device, the hydraulic drive mechanism 7 and the electric drive mechanism 6 are provided in series, and the driving force (P × S) of the hydraulic drive mechanism 7 is provided.
Are independently transmitted to the friction mechanism 5, and the driving force (Fs) of the electric drive mechanism 6 is transmitted to the friction mechanism 5 via the hydraulic drive mechanism 7.

Next, the operation of the brake device according to the embodiment of the present invention will be described. (B) When the electrical system is normal The electric drive mechanism 6 such as the electric wiring connecting the treading force sensor 2 and the control unit 8 or between the control unit 8 and the electric drive mechanism 6 and the power supply wiring to the control unit 8. When the electric system related to the operation of the solenoid valve is normal, no abnormality is detected by the abnormality detection means, and therefore, the solenoid 9d of the solenoid on-off valve 9 is not energized from the fail-safe control means. Is kept closed by the urging force of the spring 9c.

Therefore, when the brake pedal 1 is depressed in this state, the depressing force is detected by the depressing force sensor 2, and the control means of the control unit 8 controls the electric drive mechanism to generate a driving force (Fs) corresponding to the depressing force. The drive signal is output to 6. The driving force (Fs) obtained by converting the rotational motion generated by the electric driving mechanism 6 into a linear motion via the ball screw mechanism 10 is the two pistons 7b in the hydraulic driving mechanism 7 which also serves as the driving force transmitting mechanism. The friction is transmitted to the friction mechanism 5 via oil filled in a sealed oil chamber 7d formed between the cylinders 7c, whereby the disc pads 5a and 5b of the friction mechanism 5 are driven in a direction of pressing against the disc rotor 4 of the wheel. By doing so, a braking force is applied to the rotation of the wheel by the frictional force.

(B) When an abnormality occurs in the electric system The electric wiring connecting between the treading force sensor 2 and the control unit 8 or between the control unit 8 and the electric drive mechanism 6 and the power wiring to the control unit 8 are used. When an abnormality occurs in the electric system related to the operation of the electric drive mechanism 6, when the abnormality occurs in the electric system, the fail-safe control unit energizes the solenoid 9d of the electromagnetic on-off valve 9 based on the abnormality detection by the abnormality detection unit. Accordingly, the valve 9b is driven in a direction to open the valve against the urging force of the spring 9c.

Accordingly, when the brake pedal 1 is depressed in this state, the hydraulic pressure of the master cylinder 3 generated according to the depressing force opens the valve body 9b against the urging force of the spring 9c in the solenoid on-off valve 9. Is press-fitted into the closed oil chamber 7d formed between the two pistons 7b and 7c in the driving force transmission mechanism via the hydraulic pipe 12, and the hydraulic pressure causes the driving force to spread between the pistons 7b and 7c. (Px
S) is generated, a driving force (P × S) corresponding to the oil pressure generated in the master cylinder 3 is transmitted to the friction mechanism 5, whereby the disk pads 5 a and 5 b of the friction mechanism 5 are moved to the disk rotor 4 of the wheel. By driving the wheel in a direction in which the wheel is pressed against the wheel, a braking force is applied to the rotation of the wheel by the frictional force.

Further, when an abnormality occurs in the electric system related to the operation of the electric drive mechanism 6, the electric current to the solenoid 9d cannot be supplied due to the abnormality in the electric system of the abnormality detecting means and the fail-safe control means. Even if it becomes,
When the brake pedal 1 is depressed in this state, the hydraulic pressure of the master cylinder 3 generated according to the depressing force opens the valve element 9 b against the urging force of the spring 9 c of the electromagnetic on-off valve 9, and the hydraulic pipe 12 is opened. Via a hydraulic drive mechanism 7 also serving as a drive force transmission mechanism, into a sealed oil chamber 7d formed between the two pistons 7b and 7c.
Driving force (P) in the direction to push and spread between both pistons 7b and 7c
× S) occurs, the friction mechanism 5 has the master cylinder 3
The driving force (P × S) corresponding to the hydraulic pressure generated in
Accordingly, by driving the disk pads 5a and 5b of the friction mechanism 5 in a direction in which the disk pads 5a and 5b are pressed against the disk rotor 4, the braking force is applied to the rotation of the wheel by the frictional force.

As described in detail above, according to the brake device of the first embodiment of the present invention, the following effects can be obtained. That is, the friction mechanism 5 and the electric drive mechanism 6
And a driving force transmission mechanism for transmitting the driving force (Fs) of the electric driving mechanism 6 to the friction mechanism 5 via oil filled in a sealed oil chamber 7d formed between the two pistons 7b and 7c. And a normally-closed electromagnetic on-off valve 9 for opening and closing the hydraulic pipe 12 is provided in the middle of a hydraulic pipe 12 connecting the sealed oil chamber 7d and the master cylinder 3. With this configuration, the reliability of the fail-safe operation at the time of occurrence of an abnormality in the electric system can be increased while suppressing an increase in cost with a simple configuration as compared with the case where an electrical fail-safe mechanism is provided. .

Further, the solenoid on-off valve 9 has a valve port 9a on the master cylinder 3 side and a valve body 9b on a closed oil chamber 7d.
And the valve body 9b is moved by a predetermined force to the valve port 9a.
And a solenoid 9d for driving the valve body 9b in the valve opening direction against the urging force of the spring 9c, so that the solenoid 9d in the solenoid on-off valve 6 is provided. Even in the case where the driving becomes impossible, the normally closed electromagnetic on-off valve 9 is opened by the hydraulic pressure generated in the master cylinder 3, whereby the braking force can be generated. In this case, the reliability of the fail-safe operation can be further improved.

Next, a brake device according to another embodiment of the present invention will be described. In the description of the other embodiments of the present invention, the same components as those of the above embodiment of the present invention will be denoted by the same reference numerals, and the description thereof will be omitted, and only different points will be described.

(Embodiment 2) A brake device according to Embodiment 2 of the present invention has a schematic configuration diagram of FIG.
As shown in the force model diagram of FIG. 6, an electric drive mechanism 6 and a hydraulic drive mechanism 7 are provided in parallel, and respective driving forces (Fs) and (P × S) are independently applied to the friction mechanism 5. It is configured to work. That is, as shown in FIG. 5, a transmission member 71 is provided so as to penetrate a shaft hole 62 formed in a drive section 61 of the electric drive mechanism 6, and the hydraulic drive mechanism 7 is driven via the transmission member 71. Force (P × S)
However, the electric driving mechanism 6 has a structure that acts on the friction mechanism 5 independently of the driving force (Fs). FIG. 7 shows a system configuration diagram. In the second embodiment of the present invention, the pedaling force of the brake pedal 1 is detected from the master cylinder oil pressure detected by the oil pressure sensor (stepping force detecting means) 20. It is configured.

In the second embodiment of the present invention, as described above, the respective driving forces (Fs) and (P × S) of the electric drive mechanism 6 and the hydraulic drive mechanism 7 act on the friction mechanism 5 independently. Therefore, the driving force (P × S) of the hydraulic driving mechanism 7 is not affected by the driving force (Fs) of the electric driving mechanism 6, whereby the electric driving mechanism 6 according to the pedaling force signal of the brake pedal 1 is provided. , And the driving force control is performed accurately and easily.

When an abnormality occurs in the electric system, the hydraulic drive mechanism 7 can apply a drive force (P × S) to the friction mechanism 5 with the master cylinder oil pressure according to the depression force of the brake pedal. By driving the friction mechanism 5 in the direction of pressing against the disk rotor 4, a braking force is applied to the rotation of the wheel by the friction force.

(Third Embodiment of the Invention) A brake device according to a third embodiment of the present invention will be described with reference to FIG.
As shown in the force model diagram of FIG. 9, an electric drive mechanism 6 is provided between the hydraulic drive mechanism 7 and the friction mechanism 5, and the driving force (P × S) of the hydraulic drive mechanism 7 Drive unit 6
1 to act on the friction mechanism 5.

In the third embodiment of the present invention, the driving force (P × S) of the hydraulic drive mechanism 7 acts on the friction mechanism 5 via the drive section 61 of the electric drive mechanism 6 as described above. Even if the mechanisms 7 and 6 are arranged in series, the driving force (P × S) of the hydraulic driving mechanism 7 is not affected by the driving force (Fs) of the electric driving mechanism 6, and as a result, the brake pedal 1 Driving force control by the electric driving mechanism 6 according to the pedaling force signal is performed accurately and easily.

When an abnormality occurs in the electric system, the hydraulic drive mechanism 7 applies a master cylinder oil pressure corresponding to the depression force of the brake pedal 1 to drive the friction mechanism 5 via the drive section 61 of the electric drive mechanism 6. P × S), whereby the friction mechanism 5 is driven in a direction in which the friction mechanism 5 is pressed against the disk rotor 4, whereby a braking force is applied to the rotation of the wheel by the friction force.

(Embodiment 4) As shown in a schematic configuration diagram of FIG. 10 and a force model diagram of FIG. In the initial stroke range, the driving force (P × S) acts on the friction mechanism 5 independently of the electric driving mechanism 6, and the driving force (P × S) of the hydraulic driving mechanism 7 exceeds the predetermined initial stroke range. It is configured such that a driving force (P × S) acts on the friction mechanism 5 via the drive section 6a of the electric drive mechanism 6. That is, as shown in FIG. 10, a transmission member 71 is provided so as to penetrate a shaft hole 62 formed in the drive portion 61 of the electric drive mechanism 6, and the transmission member 71 is provided in a predetermined initial stroke range of the hydraulic drive mechanism 7. The driving force (P × S) of the hydraulic driving mechanism 7 acts on the friction mechanism 5 via the member 71 independently of the driving force (Fs) of the electric driving mechanism 6, but is transmitted when it exceeds a predetermined initial stroke range. The stopper 71a of the member 71 comes into contact with the driving unit 61 of the electric driving mechanism 6, and the driving force (P × S) of the hydraulic driving mechanism 7 is applied to the friction mechanism 5 via the driving unit 61 of the electric driving mechanism 6 (P). × S) acts.

In the fourth embodiment of the present invention, as described above, the driving force (P × S) is applied to the friction mechanism 5 in parallel and independently of the electric driving mechanism 6 within the predetermined initial stroke range of the hydraulic driving mechanism 7. , The driving force (P × S) of the hydraulic driving mechanism 7 is not affected by the driving force (Fs) of the electric driving mechanism 6, whereby the electric driving according to the pedaling force signal of the brake pedal 1 is performed. The driving force control by the mechanism 6 is performed accurately and easily.

When an abnormality occurs in the electric system, the hydraulic drive mechanism 7 can transmit the driving force (P × S) to the friction mechanism 5 with the master cylinder oil pressure according to the depression force of the brake pedal 1. Thus, by driving the friction mechanism 5 in a direction in which the friction mechanism 5 is pressed against the disk rotor 4, a braking force is applied to the rotation of the wheel by the friction force.

When it is desired to reduce the hydraulic pressure input from the brake pedal 1 as in the case of the ABS control or the like, the drive unit 61 of the electric drive mechanism 6 is moved backward to allow the electric drive mechanism 6 and the hydraulic drive mechanism 7 to move backward. Driving force (Fs), (P
× S) can be made zero.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to the embodiments of the present invention, and a design change or the like may be made without departing from the gist of the present invention. The present invention is also included in the present invention.

For example, in the embodiment of the present invention, an example in which an induction motor is used as an electric drive mechanism has been described, but other types can be used.

Further, in the embodiment of the present invention, an example in which a ball screw mechanism is used as a mechanism for converting a rotary motion into a linear motion in an electric drive mechanism has been described, but other types can be used. .

Further, in the embodiment of the present invention, an example is shown in which the contact member is applied to a disk brake device using a disk rotor, but the present invention can also be applied to other types.

[0055]

As described above, in the brake device according to the first aspect of the present invention, a brake pedal, a master cylinder for generating a hydraulic pressure according to the depression force of the brake pedal, and a brake pedal for the brake pedal are provided. Treading force detecting means for detecting treading force, a contact member rotating integrally with the wheel, a friction mechanism for applying a braking force to the rotation of the wheel by a frictional force by driving in a direction in which the contact member is pressed, and the friction mechanism An electric drive mechanism for driving the brake pedal, control means for outputting a drive signal to the electric drive mechanism to generate a drive force corresponding to the depression force of the brake pedal detected by the depression force detection means, and hydraulic pressure generated by the master cylinder And a hydraulic drive mechanism for driving the friction mechanism. Effect that it is possible to enhance the reliability of the fail-safe operation in the abnormal occurrence time can be obtained.

According to a second aspect of the present invention, in the brake device according to the first aspect, the hydraulic drive mechanism is provided between two moving partitions interposed between the friction mechanism and the electric drive mechanism. The driving force of the electric drive mechanism is transmitted to the friction mechanism via oil filled in the formed closed oil chamber, and the closed oil chamber and the master cylinder are connected by a hydraulic circuit. Since a normally closed solenoid on-off valve that opens and closes the hydraulic circuit is interposed in the middle of the hydraulic circuit, the cost is reduced by a simpler configuration than when an electric fail-safe mechanism is provided. In addition, there is an effect that the reliability of the fail-safe operation at the time of occurrence of an abnormality in the electric system can be improved.

According to a third aspect of the present invention, in the brake device according to the first aspect, the hydraulic drive mechanism is provided between two movable partition walls interposed between the friction mechanism and the electric drive mechanism. The driving force of the electric drive mechanism is transmitted to the friction mechanism via oil filled in the formed closed oil chamber, and the closed oil chamber and the master cylinder are connected by a hydraulic circuit. An on-off valve that opens and closes the hydraulic circuit is interposed in the middle of the hydraulic circuit. The on-off valve has a valve port disposed on the master cylinder side and a valve element disposed on the closed oil chamber side, and a valve element is disposed at a predetermined position. The opening / closing valve is opened by the hydraulic pressure generated in the master cylinder, thereby providing a braking force. Will be able to do so Effect that so it is possible to further enhance the reliability of the fail-safe operation when abnormality occurs in the electric system.

According to a fourth aspect of the present invention, there is provided the brake device according to the first aspect, wherein the electric drive mechanism and the hydraulic drive mechanism are provided in parallel, and respective driving forces independently act on the friction mechanism. Since each driving force acts on the friction mechanism independently, the driving force of the hydraulic driving mechanism is not affected by the driving force of the electric driving mechanism. As a result, the driving force control by the electric driving mechanism according to the pedaling force signal of the brake pedal can be accurately and easily performed.

According to a fifth aspect of the present invention, in the brake device according to the first aspect, the electric drive mechanism is provided between the hydraulic drive mechanism and the friction mechanism, and the driving force of the hydraulic drive mechanism is reduced. With the means configured to act on the friction mechanism via the drive unit of the electric drive mechanism, the driving force of the hydraulic drive mechanism can be increased even when both mechanisms are arranged in series. There is no influence of the force, whereby the driving force control by the electric driving mechanism according to the pedaling force signal of the brake pedal can be performed accurately and easily.

According to a sixth aspect of the present invention, in the brake device according to the first aspect, a driving force acts on the friction mechanism independently of the electric drive mechanism in a predetermined initial stroke range of the hydraulic drive mechanism. When the driving force of the hydraulic drive mechanism exceeds a predetermined initial stroke range, the driving force acts on the friction mechanism via the drive unit of the electric drive mechanism. The driving force of the driving mechanism is not affected by the driving force of the electric driving mechanism, whereby the driving force control by the electric driving mechanism according to the pedaling force signal of the brake pedal can be performed accurately and easily. Also, when it is desired to reduce the hydraulic pressure input from the brake pedal, such as during the ABS control, the drive unit of the electric drive mechanism is retracted.
The sum of the driving forces of the electric drive mechanism and the hydraulic drive mechanism can be reduced to zero.

According to a seventh aspect of the present invention, in the brake device according to the second aspect, the solenoid on-off valve has a valve port disposed on the master cylinder side and a valve element disposed on the closed oil chamber side. A means comprising urging means for urging the body in a direction of pressing against the valve port with a predetermined force, and a solenoid for driving the valve body in the valve opening direction against the urging force of the urging means. Then, when an abnormality occurs in the electric system, the solenoid can be driven in a direction to open the valve body by energizing the solenoid of the solenoid on-off valve, and the energizing of the solenoid becomes impossible. Also, the master cylinder oil pressure can open the valve body of the solenoid on-off valve against the urging force of the urging means to generate a braking force. Reliable fail-safe operation Effect further be so can increase the is obtained.

In the brake device according to the eighth aspect, in the brake device according to the second or seventh aspect, abnormality detection means for detecting an abnormality in an electric system related to the operation of the electric drive mechanism, and the abnormality detection means Fail-safe control means for driving the electromagnetic opening / closing valve in a direction to open the valve when an abnormality in the electric system is detected. Will be able to do it.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a brake device according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a main part of the brake device according to the first embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of a brake device according to the first embodiment of the present invention.

FIG. 4 is a model diagram of a force in the brake device according to the first embodiment of the present invention.

FIG. 5 is a schematic configuration diagram of a brake device according to a second embodiment of the present invention.

FIG. 6 is a model diagram of a force in a brake device according to a second embodiment of the present invention.

FIG. 7 is an overall system configuration diagram showing a brake device according to a second embodiment of the present invention.

FIG. 8 is a schematic configuration diagram of a brake device according to a third embodiment of the present invention.

FIG. 9 is a model diagram of a force in a brake device according to a third embodiment of the present invention.

FIG. 10 is a schematic configuration diagram of a brake device according to a fourth embodiment of the present invention.

FIG. 11 is a model diagram of a force in a brake device according to a fourth embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Brake pedal 2 Depressing force sensor (depressing force detecting means) 3 Master cylinder 4 Disk rotor (contact member) 5 Friction mechanism 5a Disk pad 5b Disk pad 5c Caliper 6 Electric drive mechanism 6a Coil 6b Stator 6c Casing 6d Rotor 6e Bearing 7 Driving force transmission Mechanism 7a Cylinder 7b Piston 7c Piston 7d Sealed oil chamber 7e Sliding seal member 8 Control unit (control means, fail-safe control means) 9 Electromagnetic on-off valve 9a Valve port 9b Valve element 9c Spring (biasing means) 9d solenoid 10 Ball screw Mechanism 11 Ball screw shaft 12 Hydraulic piping (hydraulic circuit) 20 Hydraulic sensor (pedal force detecting means) 61 Drive unit 62 Shaft center hole 71 Transmission member 71a Stopper

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) BA62 BA80 CC03 CC15 CC17 CC25 CC33 CC35 CC63 CC77 CC78 CD03 CD06 DB18 DB21 DB27

Claims (12)

[Claims] 1. A brake pedal, a master cylinder for generating a hydraulic pressure in accordance with a depression force of the brake pedal, a depression force detection means for detecting a depression force of the brake pedal, a contact member rotating integrally with a wheel, A friction mechanism that applies a braking force to the rotation of the wheel by frictional force by being driven in the direction of pressing against the member, an electric drive mechanism that drives the friction mechanism, and a pedaling force of the brake pedal detected by the pedaling force detection unit. Control means for outputting a drive signal to the electric drive mechanism to generate a corresponding drive force; and a hydraulic drive mechanism for driving the friction mechanism by a hydraulic pressure generated in the master cylinder. Brake device. 2. The electric drive mechanism according to claim 1, wherein the hydraulic drive mechanism includes an oil filled in a sealed oil chamber formed between two movable partition walls interposed between the friction mechanism and the electric drive mechanism. And a master cylinder is connected between the closed oil chamber and the master cylinder by a hydraulic circuit, and a normally closed electromagnetic circuit for opening and closing the hydraulic circuit in the middle of the hydraulic circuit. The brake device according to claim 1, wherein an on-off valve is interposed. 3. The electric drive mechanism according to claim 1, wherein the hydraulic drive mechanism includes an oil filled in a sealed oil chamber formed between two movable partition walls interposed between the friction mechanism and the electric drive mechanism. The sealing oil chamber and the master cylinder are connected by a hydraulic circuit, and an on-off valve for opening and closing the hydraulic circuit is provided in the middle of the hydraulic circuit. The on-off valve has a valve port disposed on the master cylinder side and a valve element disposed on the closed oil chamber side, and has an urging means for urging the valve element in a direction of pressing against the valve port with a predetermined force. The brake device according to claim 1, wherein the brake device is provided. 4. The apparatus according to claim 1, wherein said electric drive mechanism and said hydraulic drive mechanism are provided in parallel, and each drive force acts on said friction mechanism independently. Brake equipment. 5. The electric drive mechanism is provided between the hydraulic drive mechanism and the friction mechanism, and a driving force of the hydraulic drive mechanism acts on the friction mechanism via a drive section of the electric drive mechanism. The brake device according to claim 1, wherein the brake device is configured as follows. 6. A drive force acts on the friction mechanism independently of the electric drive mechanism in a predetermined initial stroke range of the hydraulic drive mechanism, and when the drive mechanism exceeds the predetermined initial stroke range, the drive force of the hydraulic drive mechanism is increased. The brake device according to claim 1, wherein a driving force is applied to the friction mechanism via a drive unit of the electric drive mechanism. 7. The solenoid on-off valve has a valve port disposed on the master cylinder side and a valve element disposed on the sealed oil chamber side, and urges the valve element in a direction of pressing against the valve port with a predetermined force. 3. The apparatus according to claim 2, further comprising a biasing means, and a solenoid for driving the valve body in a valve opening direction against the biasing force of the biasing means.
The brake device according to item 1. 8. An abnormality detecting means for detecting an abnormality in an electric system related to the operation of the electric drive mechanism, and in a direction to open the electromagnetic on-off valve when the abnormality detecting means detects an abnormality in the electric system. 8. The brake device according to claim 2, further comprising a fail-safe control unit that is driven. 9. The brake device according to claim 2, wherein at least one of said movable partition walls is constituted by a piston sliding in a cylinder. 10. The apparatus according to claim 2, wherein at least one of said movable partition walls is constituted by a diaphragm.
The brake device according to any one of 3, 7 to 9. 11. The mobile phone according to claim 2, wherein at least one of said movable partition walls is formed of a bellows.
The brake device according to any one of claims 10 to 10. 12. The brake device according to claim 1, wherein said contact member comprises a disk rotor.