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Brake apparatus for a vehicle

A technology for vehicle braking and equipment, applied in the direction of the brake, etc., can solve the problem that the operation of the brake pedal is not conducive to the driver and other problems

Inactive Publication Date: 2007-01-31
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in this case, the pressure in the drive pressure chamber and the pressure chamber increases as the input member moves forward, so that the force caused by this pressure change is transmitted to the brake pedal via the spool and the intake member , which is detrimental to the way the brake pedal operation feels to the driver

Method used

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  • Brake apparatus for a vehicle
  • Brake apparatus for a vehicle
  • Brake apparatus for a vehicle

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Embodiment Construction

[0021] As shown in FIG. 1 , according to the vehicle brake apparatus in the first exemplary embodiment, a master cylinder 11 and a vacuum booster 12 are integrally connected. In this master cylinder 11, the air cylinder 13 has a cylindrical shape, and the base end part is opened, and the top end part was closed. The input piston 14 and the pressurizing piston 15 are arranged on the same axis and supported so as to be slidable in the cylinder 13 in the axial direction. The input piston 14 provided toward the base end portion of the air cylinder 13 has a connection portion 17 formed therein, against which a top end portion of a push rod 16 as an input member abuts. Also, the input piston 14 has a cross-section similar to the shape of a letter U, and the top end is partially opened. The outer peripheral surface of the input piston 14 is movably supported by the outer peripheral surface of the air cylinder 13 . The step portion 18 limits the movement stroke of the input piston 1...

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Abstract

A master cylinder is connected to a vacuum booster which multiplies a brake operating force of a brake pedal. A push rod then transmits that multiplied force to an input piston and a pressurizing piston of the master cylinder. In addition, a hydraulic pump transmits a control pressure to the input piston and the pressurizing piston of the master cylinder such that a predetermined brake pressure is output from the master cylinder. A reaction force spring is also provided which applies a reaction force to the brake pedal which is greater than the reaction force transmitted from the vacuum booster to the operating rod.

Description

technical field [0001] The present invention relates to a vehicle brake apparatus that electronically controls a braking force applied to a vehicle with respect to a brake operation amount. Background technique [0002] There is known an electronically controlled brake apparatus that electronically controls the braking force of a brake device—that is, supplied to a wheel cylinder that drives the brake apparatus—with respect to a brake operation amount input by a brake pedal. ) hydraulic pressure. One such braking device is described in Japanese Patent Publication No. JP-A-2002-274360, for example. [0003] In this hydraulic brake apparatus, a first piston defining a front pressure chamber and a rear drive chamber is accommodated in a housing of a master cylinder. In addition, a second piston capable of sliding relative to the first piston is housed in the first piston. The front of the second piston communicates with the pressure chamber, while the rear of the piston comm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60T8/173
CPCB60T8/441B60T13/20B60T13/581
Inventor 矶野宏
Owner TOYOTA JIDOSHA KK
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