US 2008/0185241 A1Published application

Vehicle Braking System

AssigneeToyota Jidosha Kabushiki Kaisha

InventorsHiroshi Isono, Yasuji Mizutani

Life of this patent

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Abstract

A vehicle braking system including an input piston and a pressure piston that are moveably supported within a cylinder. The input piston is allowed to depress the pressure piston and is connected to the a brake pedal. Pressure chambers to the front and to the rear of the input piston are communicated through a communication passage such that the control hydraulic pressure in accordance with the operation amount to the brake pedal is applied to the second pressure chamber via first and second linear valves. The control hydraulic pressure in accordance with the operation amount to the brake pedal that has been transmitted to the pressure piston through the input piston is regulated by a pressure regulating valve so as to be applied to the second pressure chamber. The braking hydraulic pressure may be output from the pressure chambers, respectively.

Claims30

Dependent claims

A vehicle braking system comprising:

an input piston moveably supported within a cylinder along an axial direction;
an operation portion connected to the input piston;
a pressure piston provided coaxially with the input piston, moveably supported within the cylinder along its axial direction, which is allowed to be depressed by the input piston;
a control hydraulic pressure setting unit that sets a control hydraulic pressure according to an operation amount inputted from the operation portion to the input piston;
an electromagnetic hydraulic pressure supply unit that regulates a hydraulic pressure supplied from a hydraulic pressure supply source to the control hydraulic pressure so as to be applied to the input piston and the pressure piston such that a braking hydraulic pressure is generated;
and
a mechanical hydraulic pressure supply unit that regulates the hydraulic pressure supplied from the hydraulic supply source to the control hydraulic pressure according to the operation amount transmitted from the operation portion to the pressure piston through the input piston so as to be applied to the pressure piston such that the braking hydraulic pressure is generated.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/997,056Filed 30 Aug 2006
Priority: JP 2005-25266931 Aug 2005
Published: 7 Aug 2008
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

B60T 8/4077
Systems in which a driver input signal is used as a control signal for the additional fluid circuit which is normally used for braking: systems in…
B60T 8/3655
Electromagnetic valves specially adapted for anti-lock brake and traction control systems: continuously controlled electromagnetic valves
B60T 8/441
Co-operating with a power-assist booster means associated with a master cylinder for controlling the release and reapplication of brake pressure…:…
B60T 8/90
With failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means: using a simulated…

Family

US 8,348,354 B2Related patent
US 2008/0185241 A1This patent

From the US filing history. Foreign family members aren’t listed.

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