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Vehicle braking apparatus

A brake device and wheel brake cylinder technology, which is applied in the direction of brake transmission device, brake action activation device, brake, etc., can solve the problems of motor miniaturization, inability to ensure responsiveness, etc., and achieve small size and light weight , Reduce the maximum load torque and improve the responsiveness

Active Publication Date: 2012-07-11
HONDA MOTOR CO LTD
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Problems solved by technology

[0004] However, in the above-mentioned prior art, the rotational speed is increased by performing weak field control on the electric motor, so that the driving speed of the piston of the slave hydraulic cylinder is increased, so that the responsiveness of the brake hydraulic pressure can be improved to a certain extent, but in avoiding In emergency situations such as collisions, it is inevitable that sufficient responsiveness cannot be ensured, so there is a limit to the miniaturization of the motor of the slave hydraulic cylinder

Method used

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no. 1 approach

[0056] like figure 1 As shown, the tandem-type master hydraulic cylinder 11 has a first piston 14 connected to the brake pedal 12 operated by the driver via a push rod 13 and a second piston 15 arranged in front of the first piston 14 . The first hydraulic chamber 17 in which the return spring 16 is accommodated between the first piston 14 and the second piston 15 is divided, and the second hydraulic chamber 19 in which the return spring 18 is accommodated in front of the second piston 15 is divided. The first hydraulic chamber 17 and the second hydraulic chamber 19, which can communicate with the reservoir 20, respectively have a first output port 21 and a second output port 22, and the first output port 21 passes through the hydraulic passage Pa, Pb, VSA (Vehicle Stability Assist) The device 23 and the fluid paths Pc, Pd are connected to the wheel brake cylinders 26, 27 (first system) of, for example, the disc brake devices 24, 25 of the left and right rear wheels, and the s...

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Abstract

The invention provides a vehicle breaking apparatus having a hydraulic pressure source which can generate brake hydraulic pressure corresponding to a piston forward movement driven by an electric motor. The apparatus enables the electric motor small and light-weighted while the responsiveness of the brake hydraulic pressure generation is ensured. The hydraulic pressure source with BBW-type brake apparatus comprises: a slave hydraulic cylinder (42), generating brake hydraulic pressure by the forward movement of the piston (48) driven by the electric motor (44); a VSA apparatus (23), by using a pump (64), pressurizing on the brake fluid at the downstream side of the slave hydraulic cylinder (42). For the slave hydraulic cylinder (42) and the VSA apparatus (23) are selectively acted based on the operation amount of a brake pedal (12), the slave hydraulic cylinder (42) is acted when the high responsiveness of generating brake hydraulic pressure is not required, so that the miniaturization of the electric motor (44) is achieved and the VSA apparatus (23) is acted when the high responsiveness of generating brake hydraulic pressure is required, thereby ensuring the high responsiveness.

Description

technical field [0001] The present invention relates to a brake device for a vehicle, comprising: an operation amount detection mechanism for detecting an operation amount of a brake pedal; a hydraulic pressure source for generating brake hydraulic pressure corresponding to the operation amount detected by the operation amount detection mechanism; a control mechanism that controls the operation of the hydraulic pressure source; and a wheel brake cylinder that operates with brake hydraulic pressure generated by the hydraulic pressure source. Background technique [0002] A BBW (brake-by-wire) type vehicle braking device is known from Patent Document 1 below, in which cost reduction is achieved by miniaturizing an electric motor that uses a slave as a hydraulic pressure source. The dynamic hydraulic cylinder is operated, and at the same time, the responsiveness of the brake hydraulic pressure is improved, and the electric motor is subjected to weak field control to increase th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60T13/66
CPCB60T17/22B60T13/662B60T13/745B60T13/686B60T8/442B60T7/042B60T8/4081
Inventor 岛田贵史
Owner HONDA MOTOR CO LTD
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