# US 2008/0185548 A1 · Electromagnetic valve

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- Number: US 2008/0185548 A1
- Document ID: US20080185548A1
- Status: Published application
- Kind: A1
- Application number: 12/022,410
- Filed: 2008-01-30
- Published: 2008-08-07
- Earliest claimed: 2007-02-01
- Assignees: Nissin Kogyo Co., Ltd.
- Inventors: Michio Takahashi; Takaaki Komaba; Takuyo Shimono
- Web page: https://patentgrep.com/patent/US20080185548A1

## CPC

- B60T 8/363: {in hydraulic systems (B60T8/3655, B60T8/3675 and B60T8/369 take precedence)}
- F16K 31/0665: {with valve member being at least partially ball-shaped (F16K31/0662 takes precedence)}
- B60T: VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL (electrodynamic brake systems for vehicle, in general B60L; brakes per se, i.e. devices where braking effect occurs, including ultimate brake actuators, F16D); ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)}

## Abstract

An electromagnetic valve has a fixed core, a movable core, a coil attract the fixed core and the movable core each other, a valve body and a valve seat member including a funnel-shaped valve seat surface and an inlet path. The flow path is closable by retreat/advance of the valve body relative to the valve seat surface. The valve body includes a semi-spherical seal portion and a stem portion extending from the seal portion towards the movable core, a diameter of an end portion of the seal portion at the stem portion side is larger than a diameter of an end portion of the stem portion at the seal portion side. A space is defined in an area located on an extended line extending from a small diameter end portion to a large diameter end portion of the valve seat surface.

## Claims

### Claim 1

An electromagnetic valve comprising:
a fixed core;
a movable core disposed so as to advance and retreat relative to the fixed core;
a coil which generates a magnetic field which causes the fixed core and the movable core to attract each other;
a valve body disposed so as to move together with the movable core; and
a valve seat member comprising:
a funnel-shaped valve seat surface which closes a flow path by being brought into abutment with the valve body and
an inlet path formed in a bottom of the valve seat surface,
wherein fluid flows from the inlet path towards the valve body side,
the flow path is opened and closed by retreat and advance of the valve body relative to the valve seat surface,
the valve body comprises:
a semi-spherical seal portion; and
a stem portion which extends from the seal portion towards the movable core,
wherein a diameter of an end portion of the seal portion at the stem portion side is larger than a diameter of an end portion of the stem portion at the seal portion side, and
a space into which the fluid flows out is defined in an area which is located on an extended line extending from a small diameter end portion to a large diameter end portion of the valve seat surface.

### Claim 2 (depends on 1)

The electromagnetic valve as set forth in claim 1,
wherein the valve body comprises:
a large diameter portion which is provided closer to the movable core than the stem portion and which has a larger diameter than that of the stem portion; and
a diameter expanding portion whose diameter is gradually increased from the stem portion towards the large diameter portion.

### Claim 3 (depends on 1)

The electromagnetic valve as set forth in claim 1,
wherein the electromagnetic valve is a normally open electromagnetic valve in which the movable core moves the valve body in a valve closing direction by the coil being energized.

### Claim 4 (depends on 1)

The electromagnetic valve as set forth in claim 1, further comprising
a retainer which is formed separately from the valve body and is adapted to transmit a movement of the movable core to the valve body.

### Claim 5 (depends on 1)

The electromagnetic valve as set forth in claim 1, wherein
the valve body and the movable core are integral with each other.