US5234030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure-regulating device for a hydraulic circuit
Assignee: Bendix Europe Services Techniques SA
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Filing: 1992-06-15
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Granted: 1993-08-10
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Expires: 2012-06-15
Abstract
Abstract The invention relates to a pressure-regulating device for a hydraulic circuit comprising at least one generator (30) of pressurized fluid, a hydraulic motor (28) and a reservoir (32) of fluid under low pressure, and including an electrovalve controlled by a calculator and comprising, in a yoke (8), an electric coil (10) and a sliding magnetic core (12) controlling a slider (16) sliding in a bore provided in a body (18), the slider (16) defining two chambers (22, 36) arranged on either side of the slider (16) in the bore, the slider comprising a hydraulic enclosure (40) communicating with the hydraulic motor (28) and defining a reaction force supplementing the force generated by the coil (10), counter to a prestressed resilient mechanism (20), the enclosure (40) consisting of a blind bore made in the slider (16), a needle (42) closing the enclosure (40) in a substantially leaktight manner, while a radial pierced hole (44) connects it to a groove ( 34) provided at the periphery of the slider (16). According to the invention, the needle (42) bears on a cup (46) which is stationary with respect to the yoke (8) of the electric coil (10).
Inventors
- 👤 Gilbert Kervagoret
- 👤 Jean-Marc Cheron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:22
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/36; B60T8/3615; B60T8/3655; B60T8/366; B60T8/367; B60T8/3665; G; G05; G05D; G05D16/00; G05D16/20; G05D16/2006; G05D16/2013; G05D16/2024; G05D16/2093; G05D16/2097; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87169; Y10T137/87217
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
166 words
A pressure-regulating electrovalve for a hydraulic circuit comprising at least one generator of pressurized fluid, a hydraulic motor and a reservoir of fluid under low pressure, said pressure-regulating electrovalve being controlled by a control mechanism and comprising; an electric coil and a sliding magnetic core arranged in a yoke; a body provided with a bore in which is arranged a slider slidable by said sliding magnetic core under a force generated by said coil counter to resilient means; a hydraulic enclosure comprising a blind bore in the slider, said blind bore in communication with the hydraulic motor through a radial hole of the slider and a peripheral groove of said slider; a needle closing said hydraulic enclosure in substantially leaktight manner, the pressure of fluid in said hydraulic enclosure defining a reaction force supplementing the force generated by the coil, and a stationary cup serving as a support for both the needle and a return spring of a ball valve controlled by said sliding magnetic core.
Claim 2
Dependent Claim
166 words
A pressure-regulating electrovalve for a hydraulic circuit comprising at least one generator of pressurized fluid, a hydraulic motor and a reservoir of fluid under low pressure, said pressure-regulating electrovalve being controlled by a control mechanism and comprising; an electric coil and a sliding magnetic core arranged in a yoke; a body provided with a bore in which is arranged a slider slidable by said sliding magnetic core under a force generated by said coil counter to resilient means; a hydraulic enclosure comprising a blind bore in the slider, said blind bore in communication with the hydraulic motor through a radial hole of the slider and a peripheral groove of said slider; a needle closing said hydraulic enclosure in substantially leaktight manner, the pressure of fluid in said hydraulic enclosure defining a reaction force supplementing the force generated by the coil, and a stationary cup serving as a support for both the needle and a return spring of a ball valve controlled by said sliding magnetic core.
Claim 3
Dependent Claim
15 words
The electrovalve according to claim 1, wherein the cup is integrally connected with the yoke.
Claim 4
Dependent Claim
16 words
The electrovalve according to claim 1, wherein the cup defines a rest position of the slider.
Claim 5
Dependent Claim
44 words
The electrovalve according to claim 1, wherein the ball valve is arranged between the reservoir and one of two chambers defined by the slider and is closed when the electric coil is not excited so as to isolate the hydraulic circuit from the reservoir.
Claim 6
Dependent Claim
27 words
The electrovalve according to claim 4, wherein said ball valve comprises fingers penetrating into corresponding orifices in the cup in order to be engageable with the slider.
Claim 7
Dependent Claim
21 words
The electrovalve according to claim 5, wherein the resilient means comprises at least one spring housed in one of said chambers.
Claim 8
Dependent Claim
13 words
The electrovalve according to claim 4, wherein said chambers communicate with each other.
Claim 9
Dependent Claim
180 words
A pressure-regulating electrovalve for a hydraulic circuit comprising at least one generator of pressurized fluid, a hydraulic motor and a reservoir of fluid under low pressure, said pressure-regulating electrovalve being controlled by a control mechanism and comprising: an electric coil and a sliding magnetic core arranged in a yoke; a body provided with a bore in which is arranged a slider slidable by said sliding magnetic core under a force generated by said coil counter to resilient means; a hydraulic enclosure comprising a blind bore in the slider, said blind bore in communication with the hydraulic motor through a radial hole of the slider and a peripheral groove of said slider; a needle closing said hydraulic enclosure in substantially leaktight manner, the pressure of fluid in said hydraulic enclosure defining a reaction force supplementing the force generated by the coil, and a cup integrally connected to the yoke, the cup defining a rest position of the slider and serving as a support for both the needle and a return spring of a ball valve controlled by said sliding magnetic core.
Claim 10
Dependent Claim
180 words
A pressure-regulating electrovalve for a hydraulic circuit comprising at least one generator of pressurized fluid, a hydraulic motor and a reservoir of fluid under low pressure, said pressure-regulating electrovalve being controlled by a control mechanism and comprising: an electric coil and a sliding magnetic core arranged in a yoke; a body provided with a bore in which is arranged a slider slidable by said sliding magnetic core under a force generated by said coil counter to resilient means; a hydraulic enclosure comprising a blind bore in the slider, said blind bore in communication with the hydraulic motor through a radial hole of the slider and a peripheral groove of said slider; a needle closing said hydraulic enclosure in substantially leaktight manner, the pressure of fluid in said hydraulic enclosure defining a reaction force supplementing the force generated by the coil, and a cup integrally connected to the yoke, the cup defining a rest position of the slider and serving as a support for both the needle and a return spring of a ball valve controlled by said sliding magnetic core.
Claim 11
Dependent Claim
44 words
The electrovalve according to claim 8, wherein the ball valve is arranged between the reservoir and one of two chambers defined by the slider and is closed when the electric coil is not excited so as to isolate the hydraulic circuit from the reservoir.
Claim 12
Dependent Claim
27 words
The electrovalve according to claim 9, wherein said ball vale comprises fingers penetrating into corresponding orifices in the cup in order to be engageable with the slider.
Claim 13
Dependent Claim
21 words
The electrovalve according to claim 10, wherein the resilient means comprises at least one spring housed in one of said chambers.
Claim 14
Dependent Claim
13 words
The electrovalve according to claim 9, wherein said chambers communicate with each other.
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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) | 1996-08-09 | 1997-02-08 | 1997-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-09 | 2001-02-08 | 2001-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-09 | 2005-02-08 | 2005-08-10 | $7700.00 | Window Closed / Lapsed |