Solenoid driving device and solenoid valve

• US 20050051748A1
• Filed: 09/01/2004
• Published: 03/10/2005
• Est. Priority Date: 09/04/2003
• Status: Active Grant

• Current Assignee: Aisin AW Company Limited (Aisin Corp.)
• Original Assignee: Aisin AW Company Limited (Aisin Corp.)
• Inventors: Kokubu, Takahiro, Sasago, Shunpei
• Granted Patent: US 7,028,980 B2
• Time in Patent Office: Days
• US Class Current: 251/129.150
• CPC Class Codes: F16K 31/0613 with cylindrical slides
• CPC Class Codes: F16K 31/0668 Sliding valves
• CPC Class Codes: H01F 7/081 Magnetic constructions
• CPC Class Codes: H01F 7/1607 Armatures entering the winding

Abstract

A solenoid driving device includes a coil formed by winding a coil wire on a bobbin formed of a non-magnetic material, end portions formed of a magnetic material which are disposed adjacent to both ends of the coil, a yoke formed of a magnetic material which is disposed encompassing the coil and the end portions, and a plunger disposed slidably in a hollow portion formed within the bobbin and end portions. The plunger includes a base formed of a magnetic material, a first layer formed of a non-magnetic material, and a second layer formed of a non-magnetic material having a friction coefficient smaller than that of the first layer. This allows magnetism to be severed between the plunger and end portions.

Claims

1. A solenoid driving device comprising:

a coil disposed on a bobbin formed of a non-magnetic material;

end portions formed of a magnetic material which are disposed adjacent to both ends of said coil;

a yoke formed of a magnetic material which is disposed encompassing said coil and said end portions; and

a plunger disposed slidably in a hollow portion formed within said bobbin and end portions in the radial direction;

said plunger comprising

a base formed of a magnetic material,

a first layer formed of a non-magnetic material which is disposed outside of said base in the radial direction, and

a second layer formed of a non-magnetic material which has a friction coefficient smaller than that of said first layer and is disposed outside of said first layer in the radial direction.

2. The solenoid driving device according to claim 1, wherein said first layer is formed thicker than said second layer.

3. The solenoid driving device according to claim 1, wherein said first layer is formed by plating processing.

4. The solenoid driving device according to claim 1, wherein said second layer comprises of any one of fluororesin, molybdenum disulfide, and amorphous carbon.

5. A solenoid valve comprising:

a coil disposed on a bobbin formed of a non-magnetic material;

end portions formed of a magnetic material which are disposed adjacent to both ends of said coil;

a yoke formed of a magnetic material which is disposed encompassing said coil and said end portions;

a plunger disposed slidably in a hollow portion formed within said bobbin and end portions in the radial direction;

a valve main unit integrally assembled with said yoke; and

a spool disposed within said valve main unit, so as to be capable of advancing and retreating within said valve main unit, with one end in contact with said plunger;

said plunger comprising

a base formed of a magnetic material,

a first layer formed of a non-magnetic material which is disposed outside of said base in the radial direction, and

a second layer formed of a non-magnetic material which has a friction coefficient smaller than that of said first layer and is disposed outside of said first layer in the radial direction.