Brake hydraulic pressure generating device

Patent metadata

Field	Value
Publication number	US-9457784-B2
Application number	US-201514658708-A
Country	US
Kind code	B2
Filing date	Mar 16, 2015
Priority date	Mar 28, 2014
Publication date	Oct 4, 2016
Grant date	Oct 4, 2016

Abstract

One embodiment of the present invention provides a brake hydraulic pressure generating device, including: a master cylinder, a stroke simulator and an on/off valve. The on/off valve opens/closes a branch hydraulic pressure passage, which branches from a main hydraulic pressure passage. The on/off valve includes a first valve mechanism including a first valve portion and a first valve seat, and a second valve mechanism including a second valve portion and a second valve seat. The first valve seat is formed in the second valve portion. A pressure receiving area in which brake hydraulic pressure acting from the stroke simulator side is received is set to be higher in the second valve portion than in the first valve portion.

First claim

The invention claimed is:

1. A brake hydraulic pressure generating device, including:
a master cylinder which is operated by operation of a brake operator;
a stroke simulator which provides a pseudo operational force to the brake operator;
a main hydraulic pressure passage which communicates between the master cylinder and a wheel cylinder;
a branch hydraulic pressure passage which is branched from the main hydraulic pressure passage and reaches the stroke simulator; and
an on/off valve which opens/closes the branch hydraulic pressure passage,
wherein the on/off valve includes
a first valve mechanism including
a first valve portion and
a first valve seat which has an annular shape and receives the first valve portion, and

a second valve mechanism including
a second valve portion which has a cylindrical shape, the first valve seat being formed in the second valve portion is formed and
a second valve seat which has an annular shape and receives the second valve portion,

wherein a pressure receiving area in which brake hydraulic pressure acting from a stroke simulator side is received is set to be higher in the second valve portion than in the first valve portion,
wherein, when brake hydraulic pressure on a master cylinder side is higher than brake hydraulic pressure on the stroke simulator side, the first valve portion is separated from the first valve seat so as to allow brake fluid to flow from the main hydraulic pressure passage to the stroke simulator through the first valve mechanism, and
wherein, when brake hydraulic pressure on the stroke simulator side is higher than brake hydraulic pressure on the master cylinder side, the second valve portion is separated from the second valve seat due to brake hydraulic pressure acting on the second valve portion from the stroke simulator side, so as to allow brake fluid to flow from the stroke simulator to the main hydraulic pressure passage through the second valve mechanism.

2. The brake hydraulic pressure generating device of claim 1 ,
wherein the on/off valve is an solenoid valve including a fixed core and a movable core in which the first valve portion is provided,
wherein a retention member which retains the second valve portion is attached to the movable core,
wherein the retention member can move relatively to the second valve portion, and
wherein a distance between the movable core and the fixed core in a state where the first valve mechanism and the second valve mechanism are closed is set so that the first valve portion can leave the first valve seat and the second valve portion can be seated on the second valve seat when the movable core abuts against the fixed core.

3. The brake hydraulic pressure generating device of claim 2 ,
wherein the retention member is formed into a cylindrical shape;
wherein a part of the second valve portion is inserted into the retention member; and
wherein an engagement portion which forms a stopper for preventing the second valve portion from falling out is formed in the retention member.

4. The brake hydraulic pressure generating device of claim 1 ,
wherein the second valve portion leaves the second valve seat when brake hydraulic pressure not lower than a predetermined pressure acts on the second valve portion from the stroke simulator side in a state where the first valve mechanism and the second valve mechanism are closed.

Assignees

• Nissin Kogyo Kk
• Autoliv Nissin Brake Systems Japan Co Ltd

Inventors

• Tokoi Hiroaki
• Sakai Kouji

Classifications

• B60T13/662

  characterised by specified functions of the control system components · CPC title

• B60T8/5025

  in hydraulic brake systems · CPC title

• B60T15/36 Primary

  Other control devices or valves characterised by definite functions {(electrically controlled valves in fluid-pressure brake systems B60T15/027, B60T15/028)} · CPC title

• B60T15/028 Primary

  in hydraulic systems · CPC title

• B60T8/4081

  Systems with stroke simulating devices for driver input (B60T8/4077 takes precedence) · CPC title