Pressure regulating reservoir

Patent metadata

Field	Value
Publication number	US-10486667-B2
Application number	US-201615737931-A
Country	US
Kind code	B2
Filing date	Jul 15, 2016
Priority date	Jul 15, 2015
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

In the present invention, when a first protrusion of a shaft abuts on a guide face thereby pressing a first valve element toward the top as seen in the drawing, the guide face is separated from a cylinder seat face, and a large-diameter oil passage is opened. At this time, when the first protrusion abuts on the guide face thereby driving the first valve element to the position where the valve opens, the first valve element is also pressed in a direction perpendicular to the reciprocating direction of the first valve element because the guide face has a spherical surface or a tapered surface. Thus, the first valve element is supported at two points, point E and point F or G, thereby dampening vibrations.

First claim

The invention claimed is:

1. A pressure regulating reservoir comprising:
a housing including an in-housing passage;
a tubular cylinder including an in-cylinder passage communicated with the in-housing passage inside and including a cylinder seat face enclosing an end on one end side of the in-cylinder passage;
a tubular first valve element including an intra-valve element passage communicating the in-housing passage with the in-cylinder passage inside and including an intra-valve element seat face formed in the intra-valve element passage, the first valve element brought into contact with and separating from the cylinder seat face to open and close a passage between the in-housing passage and the in-cylinder passage;
a second valve element arranged in the intra-valve element passage and brought into contact with and separating from the intra-valve element seat face to open and close the passage between the in-housing passage and the in-cylinder passage;
a tubular holding member in which the first valve element is arranged reciprocatably; and
a shaft arranged in the in-cylinder passage reciprocatably which drives the first valve element and the second valve element in a valve-opening direction, wherein
the first valve element includes a guide face on a side of a surface opposite to the cylinder seat face, the guide face being non-perpendicular to a reciprocating direction of the first valve element,
the shaft includes a first protrusion capable of abutting the guide face and a second protrusion capable of abutting the second valve element,
the second protrusion abuts the second valve element and the second valve element is driven in accordance with movement of the shaft in the valve-opening direction, so that the second valve element separates from the intra-valve element seat face and the passage between the in-housing passage and the in-cylinder passage is opened, and
the first protrusion abuts the guide face and the first valve element is driven in accordance with further movement of the shaft in the valve-opening direction, so that the first valve element separates from the cylinder seat face and the passage between the in-housing passage and the in-cylinder passage is opened, wherein the second protrusion is arranged so as to be offset from a center axis of the shaft in a direction opposite to the first protrusion.

2. A pressure regulating reservoir used in a vehicle brake device provided with:
a brake fluid pressure generating unit which generates brake fluid pressure on the basis of operation of a brake operating member;
wheel braking force generating units which generate braking force on wheels; and
a pump which sucks and discharges brake fluid,
the regulating reservoir comprising:
a housing including an inflow pipeline in which the brake fluid from the brake fluid pressure generating unit flows;
a reservoir chamber which stores the brake fluid and to which a suction port of the pump is connected;
a piston unit including a piston which makes capacity of the reservoir chamber variable and a spring arranged on a side opposite to the reservoir chamber across the piston to bias the piston in a direction to decrease the capacity of the reservoir chamber;
a movable portion displaced on the basis of differential pressure between pressure in a back chamber located on a side opposite to the reservoir chamber across the piston and pressure in the reservoir chamber;
a tubular cylinder including an in-cylinder passage communicating the reservoir chamber with the inflow pipeline inside and including a cylinder seat face enclosing an end on one end side of the in-cylinder passage;
a tubular first valve element including an intra-valve element passage communicating the inflow pipeline with the in-cylinder passage inside and including an intra-valve element seat face formed in the intra-valve element passage, the first valve element brought into contact with and separating from the cylinder seat face to open and close a passage between the inflow pipeline and the in-cylinder passage;
a second valve element arranged in the intra-valve element passage and brought into contact with and separating from the intra-valve element seat face to open and close the passage between the inflow pipeline and the in-cylinder passage;
a tubular holding member in which the first valve element is arranged reciprocatably; and
a shaft arranged in the in-cylinder passage reciprocatably which drives the first valve element and the second valve element in a valve-opening direction by moving in accordance with the displacement of the movable portion when the capacity of the reservoir chamber decreases, wherein
the first valve element includes a guide face on a side of a surface opposite to the cylinder seat face, the guide face being non-perpendicular to a reciprocating direction of the first valve element,
the shaft includes a first protrusion capable of abutting the guide face and a second protrusion capable of abutting the second valve element,
the second protrusion abuts the second valve element and the second valve element is driven in accordance with movement of the shaft in the valve-opening direction, so that the second valve element separates from the intra-valve element seat face and the passage between the inflow pipeline and the in-cylinder passage is opened, and
the first protrusion abuts the guide face and the first valve element is driven in accordance with further movement in the valve-opening direction of the shaft, so that the first valve element separates from the cylinder seat face and the passage between the inflow pipeline and the in-cylinder passage is opened, wherein the second protrusion is arranged so as to be offset from a center axis of the shaft in a direction opposite to the first protrusion.

3. The pressure regulating reservoir according to claim 1 , wherein a diameter of the guide face is enlarged in the valve-opening direction of the first valve element.

4. The pressure regulating reservoir according to claim 3 , wherein the guide face is a spherical surface.

5. The pressure regulating reservoir according to claim 3 , wherein the guide face is a tapered surface.

6. The pressure regulating reservoir according to claim 1 , wherein a surface which abuts the guide face of the first protrusion is an inclined surface in which a radially outer side of the shaft is higher than a radially inner side of the shaft.

7. The pressure regulating reservoir according to claim 2 , wherein a diameter of the guide face is enlarged in the valve-opening direction of the first valve element.

8. The pressure regulating reservoir according to claim 7 , wherein the guide face is a spherical surface.

9. The pressure regulating reservoir according to claim 7 , wherein the guide face is a tapered surface.

10. The pressure regulating reservoir according to claim 2 , wherein a surface which abuts the guide face of the first protrusion is an inclined surface in which a radially outer side of the shaft is higher than a radially inner side of the shaft.

Assignees

• Advics Co Ltd

Inventors

• Harada Tomoo

Classifications

• B60T2270/203

  hydraulic system components · CPC title

• B60T8/4872 Primary

  pump-back systems · CPC title

• B60T17/221

  Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems (hydraulic pressure systems in general F15B19/00, F15B21/04; testing structures or apparatus G01M) · CPC title

• B60T17/06

  Applications or arrangements of reservoirs · CPC title

• B60T13/142

  Systems with master cylinder · CPC title