US4637554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic fuel injector with magnetic stop member
Assignee: Denso Corp
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Filing: 1985-03-25
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Granted: 1987-01-20
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Expires: 2005-03-25
Abstract
Abstract An engine fuel injector has a spring-biased valve member to be electromagnetically moved out of sealing engagement with a valve seat communicated with a fuel injection orifice. The movement of the valve member away from the valve seat is limited by engagement between a stationary stop member and a flange fixed to the valve member. The stop member and the flange have opposed faces to which magnets having the same polarity are attached to assure that the flange is kept closely spaced magnetically from the stop member during the time when the valve member is out of sealing engagement with the valve seat to cause liquid fuel to exist between the flange and the stop member at that time, whereby the squeeze force of the liquid fuel is reduced to shorten the time required for the valve-closing movement of the valve member.
Inventors
- 👤 Hideto Takeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:59
CPC Classifications
F; F02; F02M; F02M51/00; F02M51/06; F02M51/061; F02M51/0625; F02M51/0664; F02M51/0671; F02M51/0675; F02M51/0678; F02M51/0635; F02M51/0642; F02M51/0646; F02M51/065; F02M51/0689; Y; Y10; Y10S; Y10S239/00; Y10S239/90
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
134 words
In an electromagnetically actuated fuel injector of the type that includes a movable core adapted to be electromagnetically driven by a solenoid, a valve seat member defining a valve seat and an injection orifice, a valve member connected to said movable core for movement therewith into and out of sealing engagement with said valve seat, one of said movable core and said valve member having a flange formed thereon, and a stationary stop member adapted to cooperate with said flange to limit the movement of said valve member away from said valve seat, the improvement which comprises: means for magnetically biasing said stop member and said flange away from each other to keep said flange closely spaced from said stop member when said valve member is out of sealing engagement with said valve seat.
Claim 2
Dependent Claim
134 words
In an electromagnetically actuated fuel injector of the type that includes a movable core adapted to be electromagnetically driven by a solenoid, a valve seat member defining a valve seat and an injection orifice, a valve member connected to said movable core for movement therewith into and out of sealing engagement with said valve seat, one of said movable core and said valve member having a flange formed thereon, and a stationary stop member adapted to cooperate with said flange to limit the movement of said valve member away from said valve seat, the improvement which comprises: means for magnetically biasing said stop member and said flange away from each other to keep said flange closely spaced from said stop member when said valve member is out of sealing engagement with said valve seat.
Claim 3
Dependent Claim
38 words
The fuel injector according to claim 1, wherein said magnetically biasing means comprises permanent magnets attached to the opposed faces of said stop member and said flange, respectively, and providing mutually opposed magnetic faces of the same polarity.
Claim 4
Dependent Claim
45 words
The fuel injector according to claim 1, wherein said magnetically biasing means comprise electromagnetic coil means attached to said stop member and said flange, respectively and arranged to magnetize said stop member and said flange such that the opposed faces thereof have the same polarity.
Claim 5
Dependent Claim
38 words
The fuel injector according to claim 1, wherein said magnetically biasing means comprise a permanent magnet attached to one of the opposed surfaces of said flange and said stop member and a diamagnetic member attached to the other.
Claim 6
Dependent Claim
36 words
The fuel injector according to claim 1, wherein said magnetically biasing means comprises an electromagnetic coil means attached to one of of said flange and said stop member, and a diamagnetic member attached to the other.
Claim 7
Dependent Claim
15 words
The fuel injector according to claim 4, wherein said diamagnetic member is formed of bismuth.
Claim 8
Dependent Claim
15 words
The fuel injector according to claim 5, wherein said diamagnetic member is formed of bismuth.
Claim 9
Dependent Claim
50 words
The fuel injector according to claim 3, wherein said electromagnetic coil means are adapted to be electrically energized during the time when said valve member is out of engagement with said valve seat and at the moment when said valve member is going to be moved toward said valve seat.
Claim 10
Dependent Claim
87 words
The fuel injector according to claim 1, wherein said magnetically biasing means comprises a permanent magnet attached to one of the opposed faces of said flange and said stop member, and electromagnetic coil means attached to the other of said flange and said stop member, said electromagnetic coil means being arranged to magnetize said the other of said flange and said stop member such that the opposed faces of said permanent magnet and said the other of said flange and said stop member have the same polarity.
Claim 11
Dependent Claim
14 words
The fuel injector according to claim 1, wherein said valve member comprises a needle.
Claim 12
Dependent Claim
14 words
The fuel injector according to claim 1, wherein said valve member comprises a ball.
Claim 13
Dependent Claim
122 words
A fuel injector comprising: a valve seat member providing an injection orifice and a valve seat; a valve member movable into sealing engagement with and away from said valve seat to close and open said injection orifice; means for actuating said valve member to cause the same to close and open said injection orifice; a flange formed on said valve member; a stationary stop member adapted to cooperate with said flange to limit the movement of said valve member away from said valve seat; and means for magnetically biasing said stop member and said flange away from each other to keep said flange closely spaced from said stop member when said valve member is out of sealing engagement with said valve seat.
Claim 14
Dependent Claim
122 words
A fuel injector comprising: a valve seat member providing an injection orifice and a valve seat; a valve member movable into sealing engagement with and away from said valve seat to close and open said injection orifice; means for actuating said valve member to cause the same to close and open said injection orifice; a flange formed on said valve member; a stationary stop member adapted to cooperate with said flange to limit the movement of said valve member away from said valve seat; and means for magnetically biasing said stop member and said flange away from each other to keep said flange closely spaced from said stop member when said valve member is out of sealing engagement with said valve seat.
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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) | 1990-01-19 | 1990-07-21 | 1991-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-19 | 1994-07-21 | 1995-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-19 | 1998-07-21 | 1999-01-20 | $7700.00 | Window Closed / Lapsed |