Solenoid driving device and solenoid valve
AssigneeAisin Aw Co., Ltd.
InventorsTakahiro Kokubu, Shunpei Sasago
Life of this patent
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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.
Claims5
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.
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.
Dependencies are inferred from the claim text.