Hydraulic pressure control device and braking system

Patent metadata

Field	Value
Publication number	US-2018304875-A1
Application number	US-201615769483-A
Country	US
Kind code	A1
Filing date	Sep 2, 2016
Priority date	Oct 26, 2015
Publication date	Oct 25, 2018
Grant date	—

Abstract

Provided is a hydraulic pressure control device and a braking system, which are capable of increasing a degree of freedom in layout of oil passages inside a housing. The hydraulic pressure control device includes a normally-closed type electromagnetic valve and a normally-open type electromagnetic valve. The normally-closed type electromagnetic valve includes a first valve part arranged so as to extend from a surface of the housing to an inside of the housing, and is configured to close an oil passage when a current is not supplied. The normally-open electromagnetic valve includes a second valve part being arranged so as to extend from the surface of the housing to the inside of the housing and having an axial length set to be equal to an axial length of the first valve part, and is configured to open the oil passage when a current is not supplied.

First claim

1 . A hydraulic pressure control device, comprising:
a housing, which internally includes an oil passage; a normally-closed electromagnetic valve, which includes a first valve part arranged so as to extend from a surface of the housing to an inside of the housing, and is configured to close the oil passage when a current is not supplied; and a normally-open electromagnetic valve, which includes a second valve part being arranged so as to extend from the surface of the housing to the inside of the housing and having an axial length set to be equal to an axial length of the first valve part, and is configured to open the oil passage when a current is not supplied.

2 . A hydraulic pressure control device according to claim 1 , wherein the housing has:
a first hole part, in which the first valve part is arranged; and a second hole part, which is set to be equal to the first hole part in depth from the surface of the housing, and in which the second valve part is arranged.

3 . A hydraulic pressure control device according to claim 2 , wherein both the first hole part and the second hole part are formed so as to extend from one surface of the housing to the inside of the housing.

4 . A hydraulic pressure control device according to claim 3 , wherein the first valve part and the second valve part include common portions having common shapes.

5 . A hydraulic pressure control device according to claim 4 ,
wherein the first valve part includes:
a first member, which is formed into a bottomed tubular shape having a first opening opened at one end, and has a first passage hole formed in a bottom wall along an axial direction, and used to open/close the oil passage; and
a second member, which is formed into a bottomed tubular shape having a second opening opened at one end, is fixed to the first opening from the second opening side in the axial direction, and has a second passage hole being formed in a bottom wall, and communicating with the first passage hole in the axial direction, and at least one first through hole formed in a peripheral wall along a radial direction,
wherein the second valve part includes:
a third member, which is formed into a bottomed tubular shape having a third opening opened at one end, and has a third passage hole formed in a bottom wall along the axial direction, and used to open/close the oil passage; and
a fourth member, which is formed into a bottomed tubular shape having a fourth opening opened at one end, is fixed from the fourth opening side to the third opening in the axial direction, and has a fourth passage hole being formed in a bottom wall, and communicating with the third passage hole in the axial direction, and at least one second through hole formed in a peripheral wall along the radial direction, and
wherein the common portions are formed of a shape of a portion of the first member other than the first opening and a shape of a portion of the third member other than the third opening.

6 . A hydraulic pressure control device according to claim 5 , wherein the common portions are formed of a shape of a portion of the second member other than the second opening and a shape of a portion of the fourth member other than the fourth opening.

7 . A hydraulic pressure control device according to claim 6 ,
wherein the normally-closed electromagnetic valve includes a first electromagnetic drive part including:
a first electromagnetic coil, which is provided so as to extend from one surface of the housing to an outside of the housing, and is configured to generate an electromagnetic force when a current is supplied;
a tubular member, which is made of a non-magnetic material, is arranged on an inner periphery of the first electromagnetic coil, and is connected to the second opening side of the second member at the first valve part; and
a first movable member, which is formed of a magnetic body, is movably provided on an inner periphery of the tubular member, moves in the axial direction through an attraction force of the first electromagnetic coil, and includes a first valve body used to open/close the first passage hole on a tip side, and
wherein the normally-open electromagnetic valve includes a second electromagnetic drive part including:
a second electromagnetic coil, which is provided so as to extend from the one surface of the housing to the outside of the housing, and is configured to generate an electromagnetic force when a current is supplied;
a fixed member, which is made of a magnetic material, is arranged on an inner periphery of the second electromagnetic coil, and is connected to a bottom wall side of the third member at the second valve part;
a cup-shaped member, which is made of a non-magnetic material, is arranged on the inner periphery of the second electromagnetic coil, and accommodates one end of the fixed member; and
a second movable member, which is formed of a magnetic body, is movably provided on an inner periphery of the cup-shaped member, moves in the axial direction through an attraction force of the second electromagnetic coil, and includes a second valve body used to open/close the third passage hole on a tip side.

8 . A hydraulic pressure control device according to claim 6 , wherein the first member, the second member, the third member, and the fourth member are formed through press forming.

9 . A hydraulic pressure control device according to claim 3 , wherein the first hole part and the second hole part are arranged so as to be adjacent to each other, and an oil passage configured to connect the first hole part and the second hole part to each other of the oil passage is arranged along the one surface of the housing.

10 . A hydraulic pressure control device according to claim 3 ,
wherein the normally-closed electromagnetic valve includes a first electromagnetic drive part including a first electromagnetic coil, which is provided so as to extend from the surface of the housing to an outside of the housing, and is configured to generate an electromagnetic force through a current supply, and wherein the normally-open electromagnetic valve includes a second electromagnetic drive part including a second electromagnetic coil, which is provided so as to extend from the surface of the housing to the outside of the housing, is configured to generate an electromagnetic force through a current supply, and has an axial length set to be equal to an axial length of the first electromagnetic coil.

11 . A hydraulic pressure control device according to claim 1 ,
wherein the first valve part includes:
a first member, which is formed into a bottomed tubular shape having a first opening opened at one end, and has a first passage hole formed in a bottom wall along an axial direction, and used to open/close the oil passage; and
a second member, which is formed into a bottomed tubular shape having a second opening opened at one end, is fixed to the first opening from the second opening side in the axial direction, and has a second passage hole being formed in a bottom wall, and communicating with the first passage hole in the axial direction, and at least one first through hole formed in a peripheral wall along a radial direction,
wherein the second valve part includes:
a third member, which is formed into a bottomed tubular shape having a third opening opened at one end, and has a third passage hole formed in a bottom wall along the axial direction, and used to open/close the oil passage; and
a fourth member, which is formed into a bottomed tubular shape having a fourth opening opened at one end, is fixed to the third opening from the fourth opening side in the axial direction, and has a fourth passage hole being formed in a bottom

Assignees

• Hitachi Automotive Systems Ltd

Inventors

• Yamaguchi Takahiro
• Nakazawa Chiharu

Classifications

• B60Y2400/81

  Braking systems · CPC title

• F16K31/0658

  Armature and valve member being one single element · CPC title

• F16K27/02

  of lift valves (for reducing the flow resistance of screw-spindle lift-valves F16K1/06) · CPC title

• B60T8/344

  Hydraulic systems · CPC title

• B60T13/686 Primary

  in hydraulic systems or parts thereof · CPC title