US4875658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic valve
Assignee: Mitsubishi Motors Corp
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Filing: 1987-10-06
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Granted: 1989-10-24
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Expires: 2007-10-06
Abstract
Abstract An is an electromagnetic valve disposed in a fluid passage to open or close the passage. A solenoid and a guide member having a guide hole are disposed in the housing. A plunger is disposed between the solenoid and the guide member and responds to energization of the solenoid. A valve member, which is coupled to the plunger to open or close the fluid passage in accordance with an energization state of the solenoid, is slidably fitted in the guide hole of the guide member. The plunger is made of a magnetic material, while of the guide member and the valve member, at least the valve member is made of a non-magnetic material and has an outer surface thereof subjected to a nitriding process. This prevents adhesion of iron powder to the valve member, eliminates an adverse influence of the magnetic field of the solenoid, and further improves the corrosion resistance and wear resistance thus ensuring smooth actuation of the valve member.
Inventors
- 👤 Yoshiro Asai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:42
CPC Classifications
F; F02; F02M; F02M51/00; F02M51/06; F02M61/00; F02M61/16; F02M61/166; F02M51/061; F02M51/0625; F02M51/0664; F02M51/0671; F02M51/0675; F02M51/0678; F02M59/00; F02M59/44; F02M59/46; F02M59/466; H; H01; H01F; H01F7/00; H01F7/06; H01F7/08; H01F7/16; H01F7/1607; H01F7/1638; F02B; F02B1/00; F02B1/02; F02B1/04
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
138 words
An electromagnetic valve which is disposed in a fluid passage to open or close said passage, said valve comprising: a housing; a solenoid disposed in said housing; a guide member disposed in said housing and having a guide hole; a plunger disposed between said solenoid and said guide member and responsive to energization of said solenoid; and a valve member, slidably fitted in said guide hole of said guide member and coupled to said plunger, for opening and closing said fluid passage in accordance with an energization state of said solenoid; said plunger being made of a magnetic material, and of said guide member and said valve member, at least said valve member being made of a non-magnetic high-magnesium austenitic steel containing 7.8% to 24.5% manganese and having an outer surface thereof subjected to a plasma nitriding process.
Claim 2
Dependent Claim
138 words
An electromagnetic valve which is disposed in a fluid passage to open or close said passage, said valve comprising: a housing; a solenoid disposed in said housing; a guide member disposed in said housing and having a guide hole; a plunger disposed between said solenoid and said guide member and responsive to energization of said solenoid; and a valve member, slidably fitted in said guide hole of said guide member and coupled to said plunger, for opening and closing said fluid passage in accordance with an energization state of said solenoid; said plunger being made of a magnetic material, and of said guide member and said valve member, at least said valve member being made of a non-magnetic high-magnesium austenitic steel containing 7.8% to 24.5% manganese and having an outer surface thereof subjected to a plasma nitriding process.
Claim 3
Dependent Claim
30 words
The electromagnetic valve according to claim 1, wherein both of said guide member and said valve member are made of said non-magnetic high-magnesium austenitic steel containing 7.8% to 24.5% manganese.
Claim 4
Dependent Claim
22 words
The electromagnetic valve according to claim 1, wherein said outer surface of said valve member is subjected to a plasma carbon-nitriding process.
Claim 5
Dependent Claim
45 words
The electromagnetic valve according to claim 1, wherein said fluid passage is a fuel supplying passage for feeding fuel to an internal combustion engine, and said electromagnetic valve is a fuel injection valve for injecting fuel in an intake passage of said internal combustion engine.
Claim 6
Dependent Claim
41 words
An electromagnetic valve according to claim 1, wherein said fluid passage is an oil passage of a hydraulic apparatus and said electromagnetic valve is a control valve for opening or closing said oil passage to control a flow of working oil.
Claim 7
Dependent Claim
45 words
An electromagnetic valve according to claim 2, wherein said fluid passage is a fuel supplying passage for feeding fuel to an internal combustion engine, and said electromagnetic valve is a fuel injection valve for injecting fuel in an intake passage of said internal combustion engine.
Claim 8
Dependent Claim
41 words
An electromagnetic valve according to claim 2, wherein said fluid passage is an oil passage of a hydraulic apparatus and said electromagnetic valve is a control valve for opening or closing said oil passage to control a flow of working oil.
Claim 9
Dependent Claim
45 words
An electromagnetic valve according to claim 3, wherein said fluid passage is a fuel supplying passage for feeding fuel to an internal combustion engine, and said electromagnetic valve is a fuel injection valve for injecting fuel in an intake passage of said internal combustion engine.
Claim 10
Dependent Claim
41 words
An electromagnetic valve according to claim 3, wherein said fluid passage is an oil passage of a hydraulic apparatus and said electromagnetic valve is a control valve for opening or closing said oil passage to control a flow of working oil.
Claim 11
Dependent Claim
18 words
The electromagnetic valve according to claim 2 wherein said high magnesium austenitic steel contains 13.25 to 14.75% manganese.
Claim 12
Dependent Claim
18 words
The electromagnetic valve according to claim 2 wherein said high magnesium austenitic steel contains 22.5 to 24.5% manganese.
Claim 13
Dependent Claim
18 words
The electromagnetic valve according to claim 2 wherein said high magnesium austenitic steel contains 17.5 to 18.5% manganese.
Claim 14
Dependent Claim
18 words
The electromagnetic valve according to claim 2 wherein said high magnesium austenitic steel contains 7.8 to 9.3% manganese.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-23 | 1993-04-24 | 1993-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-23 | 1997-04-24 | 1997-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-23 | 2001-04-24 | 2001-10-24 | $7700.00 | Window Closed / Lapsed |