US 7,922,263 B2 · Braking apparatus for vehicle

Abstract

In a braking apparatus for a vehicle, an input piston and a pressurizing piston are movably supported inside a cylinder, thereby sectioning a first pressure chamber, a second pressure chamber, and a third pressure chamber, the second pressure chamber and the third pressure chamber communicating with each other through a communicating path. An ECU causes a control hydraulic-pressure that is adjusted by first and second liner valves to act on the second pressure chamber from the third pressure chamber, thereby assisting the pressurizing piston to enable to output control hydraulic-pressure from the first pressure chamber. A counterforce chamber whose volume decreases as the input piston moves forward is provided inside a cylinder, and a counterforce giving mechanism that can give an operation counterforce to a brake pedal through the input piston by deforming corresponding to decrease of the volume of the counterforce chamber is provided inside the input piston.

Drawings

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Drawings

Claims13

Dependent claims

A braking apparatus for a vehicle, comprising:

an operating member with which a driver performs a brake operation;
a driving piston that is supported movably in an axial direction in a cylinder and that can be moved forward by the operating member, the driving piston including an input piston and a pressurizing piston;
a first pressure chamber and a second pressure chamber that are sectioned in a forward position and a backward position relative to the pressurizing piston as a result that the driving piston is movably supported in the cylinder;
a control-hydraulic-pressure setting unit that sets a control hydraulic-pressure corresponding to an operation made on the driving piston by the operating member;
a hydraulic-pressure supply unit that generates a braking hydraulic-pressure from the first pressure chamber by causing the control hydraulic-pressure set by the control-hydraulic-pressure setting unit to act on the second pressure chamber;
a counterforce chamber that is arranged in the cylinder and whose volume decreases as the driving piston moves forward;
and
a counterforce giving unit that is arranged in the driving piston, and that can give an operation counterforce to the operating member through the driving piston by deforming corresponding to decrease of volume of the counterforce chamber, wherein
the counterforce giving unit includes a compression chamber, a decompression chamber, and a counterforce piston provided between the compression chamber and the decompression chamber,
the compression chamber communicates with the counterforce chamber, and
the decompression chamber includes a biasing member that presses against the counterforce piston to compress the compression chamber.

8 more elements

A braking apparatus for a vehicle, comprising:

an operating member with which a driver performs a brake operation;
a driving piston that is supported movably in an axial direction in a cylinder and that can be moved forward by the operating member;
a first pressure chamber and a second pressure chamber that are sectioned in a forward position and a backward position relative to the driving piston as a result that the driving piston is movably supported in the cylinder;
a control-hydraulic-pressure setting unit that sets a control hydraulic-pressure corresponding to an operation made on the driving piston by the operating member;
a hydraulic-pressure supply unit that generates a braking hydraulic-pressure from the first pressure chamber by causing the control hydraulic-pressure set by the control-hydraulic-pressure setting unit to act on the second pressure chamber;
a counterforce chamber that is arranged in the cylinder and whose volume decreases as the driving piston moves forward;
and
a counterforce giving unit that is arranged in the driving piston, and that can give an operation counterforce to the operating member through the driving piston by deforming corresponding to decrease of volume of the counterforce chamber, wherein
the counterforce chamber is formed in a ring shape between the cylinder and the driving piston or an input piston,
the counterforce giving unit includes a counterforce piston that is movably supported inside the driving piston or the input piston to section a compression chamber, a communicating path that communicates the counterforce chamber and the compression chamber, and a biasing member that gives a bias in one direction to the counterforce piston to compress the compression chamber,
the counterforce piston is movably supported in the driving piston or the input piston to section the compression chamber and a decompression chamber, and
the decompression chamber is connected to a reserve tank through a discharge path.

9 more elements

A braking apparatus for a vehicle, comprising:

an operating member with which a driver performs a brake operation;
a driving piston that is supported movably in an axial direction in a cylinder and that can be moved forward by the operating member;
a first pressure chamber and a second pressure chamber that are sectioned in a forward position and a backward position relative to the driving piston as a result that the driving piston is movably supported in the cylinder;
a control-hydraulic-pressure setting unit that sets a control hydraulic-pressure corresponding to an operation made on the driving piston by the operating member;
a hydraulic-pressure supply unit that generates a braking hydraulic-pressure from the first pressure chamber by causing the control hydraulic-pressure set by the control-hydraulic-pressure setting unit to act on the second pressure chamber;
a counterforce chamber that is arranged in the cylinder and whose volume decreases as the driving piston moves forward;
and
a counterforce giving unit that is arranged in the driving piston, and that can give an operation counterforce to the operating member through the driving piston by deforming corresponding to decrease of volume of the counterforce chamber, wherein
the counterforce chamber is formed in a ring shape between the cylinder and the driving piston or an input piston,
the counterforce giving unit includes a counterforce piston that is movably supported inside the driving piston or the input piston to section a compression chamber, a communicating path that communicates the counterforce chamber and the compression chamber, and a biasing member that gives a bias in one direction to the counterforce piston to compress the compression chamber,
the counterforce piston is movably supported in the driving piston or the input piston to section the compression chamber and a decompression chamber, and
the decompression chamber is configured such that air is released through a discharge path that is provided in the driving piston or the input piston.

9 more elements

Dependencies are inferred from the claim text.

Description10,187 words

Summary1,121 words

#The present invention relates to a braking apparatus for a vehicle that electronically controls a braking force to be given to a vehicle corresponding to a brake operation performed by a driver.

#As a braking apparatus for a vehicle, an electronically-controlled braking apparatus has been known that electronically controls a braking force of a braking apparatus, that is, brake hydraulic pressure to be applied to wheel cylinders that drive this braking apparatus, corresponding to a brake operation amount (or an operating force) input through a brake pedal. As such a braking apparatus, for example, one disclosed in Patent Document 1 below is available.

#In a braking apparatus for a vehicle disclosed in Patent Document 1, when a driver operates a brake pedal, a master cylinder generates hydraulic pressure corresponding to an operation amount. At the same time, a part of hydraulic oil flows into a stroke simulator, and an operating force of the brake pedal corresponding to pressure on the brake pedal is adjusted. Meanwhile, a targeted deceleration degree of the vehicle is set corresponding to a pedal stroke that is detected by a brake ECU, distribution of the braking force to respective wheels is determined, and predetermined hydraulic pressure is given to the respective wheels.

Brief description of the drawings2 figures

#FIG. 1 is a schematic configuration diagram of a braking apparatus for a vehicle according to a first embodiment of the present invention; and

#FIG. 2 is a schematic configuration diagram of a braking apparatus for a vehicle according to a second embodiment of the present invention.

Detailed description9,019 words

#11 MASTER CYLINDER 12 CYLINDER 13 INPUT PISTON 14 PRESSURIZING PISTON 17 BRAKE PEDAL (OPERATING MEMBER) 22 OPERATING ROD 25 COUNTERFORCE SPRING 27 BIAS SPRING 28 COMMUNICATING PATH 31 HYDRAULIC PRESSURE PUMP 33 RESERVE TANK 35 ACCUMULATOR 36 HYDRAULIC-PRESSURE SUPPLY PIPE 38 FIRST LINER VALVE 43 FIRST HYDRAULIC-PRESSURE DISCHARGE PIPE 44 SECOND LINEAR VALVE 45 SECOND HYDRAULIC-PRESSURE DISCHARGE PIPE 51, 91 COUNTERFORCE GIVING MECHANISM (COUNTERFORCE GIVING UNIT) 53, 95 COUNTERFORCE PISTON 54, 96 COMMUNICATING PATH 55, 97 BIAS SPRING 56, 98 FIRST DISCHARGE PATH 57 SECOND DISCHARGE PATH 59 HYDRAULIC-PRESSURE SUPPLY/DISCHARGE PIPE 60 ON/OFF VALVE 61FR, 61FL, 61RR, 61RL WHEEL CYLINDER 62 ABS 64 FIRST HYDRAULIC-PRESSURE DELIVERY PIPE 66 SECOND HYDRAULIC-PRESSURE DELIVERY PIPE 71, 99 O-RING (SEALING MEMBER) 81 ELECTRONIC CONTROL UNIT, ECU (CONTROL-HYDRAULIC-PRESSURE SETTING UNIT) 82 STROKE SENSOR 83 DEPRESSION SENSOR 84 FIRST PRESSURE SENSOR 85 SECOND PRESSURE SENSOR 86 THIRD PRESSURE SENSOR 93 RUBBER MEMBER 94 SUPPORT BRACKET R1 FIRST PRESSURE CHAMBER R2 SECOND PRESSURE CHAMBER R3 THIRD PRESSURE CHAMBER R4 COUNTERFORCE CHAMBER R5 COMPRESSION CHAMBER R6 DECOMPRESSION CHAMBER

#Embodiments of a braking apparatus for a vehicle according to the present invention are explained in detail below with reference to the accompanying drawings. The present invention is not limited by the embodiments.

#FIG. 1 is a schematic configuration diagram of a braking apparatus for a vehicle according to a first embodiment of the present invention.

Facts

Application

12/444,947Filed 27 Dec 2007

Priority

JP 2006-35552428 Dec 2006

Published

US 2010/0066162 A118 Mar 2010

Granted

12 Apr 2011

Term ends

17 Feb 2028

Estimated · how

20 years from earliest known nonprovisional domestic filing plus recorded patent term adjustment, including 52 days of adjustment. Maintenance-fee lapses, terminal disclaimers and statutory extensions have not been checked. The continuity chain may be incomplete; this is not an enforceability determination.

Classification6 codes

B60T 13/142
Using accumulators or reservoirs fed by pumps: systems with master cylinder
B60T 7/042
Foot actuated: by electrical means, e.g. using travel or force sensors
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 13/145
Systems with master cylinder: master cylinder integrated or hydraulically coupled with booster

Timeline

28 Dec 2006Priority claimedJP 2006-355524
27 Dec 2007Application filedUS 12/444,947
16 Apr 2009Assigned to Toyota Jidosha Kabushiki Kaishaassignment of assignor's interest
18 Mar 2010PublishedUS 2010/0066162 A1
12 Apr 2011GrantedUS 7,922,263 B2
12 Oct 2026TodayWithin its term
17 Feb 2028Term endsEstimated, includes 52 days of adjustment

Braking apparatus for vehicle

Life of this patent

Braking apparatus for vehicle

Life of this patent

Life of this patent

Abstract

Drawings

Drawings

Claims13

Description10,187 words

Drawings

Classification6 codes

Life of this patent

Description10,187 words