US3976097A
Expired / Lapsed
US
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Hydraulic control arrangement
Assignee: Robert Bosch GmbH
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Filing: 1975-12-04
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Granted: 1976-08-24
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Expires: 1995-12-04
Abstract
Abstract A hydraulic control arrangement for control of fluid flow to a consumer device and comprising a three-position valve having a valve member movable between a neutral position closing at least one conduit leading to the consumer device and two working positions in one of which it connects the consumer device with a source of pressure fluid and in the other of which it connects the consumer device with a return flow conduit leading to a reservoir, a reversing valve for connecting the source of pressure fluid directly to the return flow conduit and a control conduit connected with the reversing valve. A throttle is provided in the control conduit which produces a pressure difference which can act on the valve member of the reversing valve to move the latter against the force of a spring, and the arrangement includes further means for control of the consumer device independent of the load pressure acting thereon.
Inventors
- 👤 Kornelius Brakel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:08
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/16; F15B11/161; F15B11/165; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/2053; F15B2211/20538; F15B2211/30; F15B2211/305; F15B2211/30505; F15B2211/30525; F15B2211/31; F15B2211/3105; F15B2211/3111; F15B2211/3144; F15B2211/315; F15B2211/3157; F15B2211/31576; F15B2211/50; F15B2211/505; F15B2211/50509; F15B2211/50518; F15B2211/50536; F15B2211/515; F15B2211/5151; F15B2211/55; F15B2211/57; F15B2211/60; F15B2211/605; F15B2211/6051; F15B2211/6054; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87169; Y10T137/87177; Y10T137/87185
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
440 words
Hydraulic control arrangement for controlling a flow of fluid from a pump to a consumer device independent of the load acting on the latter and from the consumer device to a reservoir, comprising, in combination, a three-position valve having an inlet connection, a return flow connection, first and second consumer device connections and a control circuit connection, said three-position valve having a valve member movable between a neutral position preventing flow between the inlet connection to at least one of said consumer device connections, a first working position connecting said inlet connection with the first consumer device connection and said second consumer device connection with said return flow connection, and a second working position connecting said inlet connection with said second consumer device connection and said first consumer device connection with said return flow connection; a first conduit connecting the pump with said inlet flow connection; a second conduit connecting said first consumer connection with said consumer device; a third conduit connecting said second consumer connection with said consumer device; a fourth conduit connecting said return flow connection with the reservoir; a bypass conduit connecting said first conduit upstream of the three-position valve with said reservoir; a reversing valve in said bypass conduit having a valve member movable between a first position permitting flow of fluid from said pump through said bypass conduit to said reservoir and a second position preventing such flow, and spring means biasing said valve member of said reversing valve to said second position; a control conduit connected to said first conduit and having a portion connected with opposite ends of said reversing valve; a throttle located in said control conduit portion and producing a pressure difference biasing said valve member of said reversing valve against the pressure of said spring means to said first position; a two-way valve having an inlet connected downstream of said throttle to said portion of said control conduit, a pair of seats to opposite sides of said inlet and forming outlets of said two-way valve, a valve member movable between said seats for respectively closing said outlets and abutting in a rest position against one of said seats for closing the corresponding one of said outlets, said control conduit connection to said three-position valve being connected with said one outlet, and said control conduit having a further portion connecting the other outlet of said two-way valve with said reservoir, said control conduit connection of said three-position valve being in at least one of said working positions of the latter connected with one of said consumer connections which is connected in this position of the three-position valve with said inlet connection.
Claim 2
Dependent Claim
440 words
Hydraulic control arrangement for controlling a flow of fluid from a pump to a consumer device independent of the load acting on the latter and from the consumer device to a reservoir, comprising, in combination, a three-position valve having an inlet connection, a return flow connection, first and second consumer device connections and a control circuit connection, said three-position valve having a valve member movable between a neutral position preventing flow between the inlet connection to at least one of said consumer device connections, a first working position connecting said inlet connection with the first consumer device connection and said second consumer device connection with said return flow connection, and a second working position connecting said inlet connection with said second consumer device connection and said first consumer device connection with said return flow connection; a first conduit connecting the pump with said inlet flow connection; a second conduit connecting said first consumer connection with said consumer device; a third conduit connecting said second consumer connection with said consumer device; a fourth conduit connecting said return flow connection with the reservoir; a bypass conduit connecting said first conduit upstream of the three-position valve with said reservoir; a reversing valve in said bypass conduit having a valve member movable between a first position permitting flow of fluid from said pump through said bypass conduit to said reservoir and a second position preventing such flow, and spring means biasing said valve member of said reversing valve to said second position; a control conduit connected to said first conduit and having a portion connected with opposite ends of said reversing valve; a throttle located in said control conduit portion and producing a pressure difference biasing said valve member of said reversing valve against the pressure of said spring means to said first position; a two-way valve having an inlet connected downstream of said throttle to said portion of said control conduit, a pair of seats to opposite sides of said inlet and forming outlets of said two-way valve, a valve member movable between said seats for respectively closing said outlets and abutting in a rest position against one of said seats for closing the corresponding one of said outlets, said control conduit connection to said three-position valve being connected with said one outlet, and said control conduit having a further portion connecting the other outlet of said two-way valve with said reservoir, said control conduit connection of said three-position valve being in at least one of said working positions of the latter connected with one of said consumer connections which is connected in this position of the three-position valve with said inlet connection.
Claim 3
Dependent Claim
31 words
A control valve arrangement as defined in claim 1 and including a second throttle between said one outlet of said two-way valve and that control conduit connection of said three-position valve.
Claim 4
Dependent Claim
25 words
A control valve arrangement as defined in claim 2, wherein said second throttle is constructed to produce a greater pressure drop than said first-mentioned throttle.
Claim 5
Dependent Claim
60 words
A control valve arrangement as defined in claim 2, wherein said valve member for said three-position valve forms a third throttle and wherein the sum of the pressure drops produced by said first and second throttle is at least equal to the pressure drop produced by said third throttle, as considered for a nominal flow of fluid through said arrangement.
Claim 6
Dependent Claim
58 words
A control valve arrangement as defined in claim 2, wherein said valve member of said three-position valve forms a third throttle and wherein the sum of the pressure drops produced by said first and second throttle is greater than the pressure drop produced by said third throttle as considered for a nominal flow of fluid through said arrangement.
Claim 7
Dependent Claim
52 words
A control valve arrangement as defined in claim 1, and including at least a second three-position valve connected in parallel with said first-mentioned three-position valve and a second two-way valve coordinated therewith, the inlet of said second two-way valve being connected to the other of said outlets of said first-mentioned two-way valve.
Claim 8
Dependent Claim
28 words
A control valve arrangement as defined in claim 1, wherein in said neutral position of said three-position valve, said control circuit connection thereof is connected with said reservoir.
Claim 9
Dependent Claim
25 words
A control valve arrangement as defined in claim 1, and including a spring biasing said valve member of said two-position valve against said one seat.
Claim 10
Dependent Claim
32 words
A control valve arrangement as defined in claim 6, wherein the other outlet of said second two-way valve is connected to said further portion of said control conduit leading to said reservoir.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-24 | 1980-02-23 | 1980-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-24 | 1984-02-23 | 1984-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-24 | 1988-02-23 | 1988-08-24 | $7700.00 | Window Closed / Lapsed |