Patent US3743445A successfully refreshed from Google Patents.
US3743445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regulated pump with constant displacement volume
Assignee: Robert Bosch GmbH
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Filing: 1971-04-01
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Granted: 1973-07-03
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Expires: 1991-04-01
Abstract
Abstract A pump has a housing with a housing ring, a rotor with pistons, and a control ring between the housing ring and the rotor so that a working space is formed between the rotor and the control ring, and an annular space is formed between the control ring and the housing ring. The annular space is divided into first and second control spaces, connected by throttling means. The first control space receives high pressure fluid, and the second control space discharges into a consumer line. When at high rotary speed, the pressure differential becomes great, the control ring is displaced to reduce the working space so that a substantially constant volume is pumped at different speeds. A compensating device responds to the pressure in the consumer line to urge the control ring to increase the working space so that the influence of the fluid pressure and of the piston friction on the control ring is compensated.
Inventors
- 👤 W Dworak
- 👤 K Mueller
- 👤 W Talmon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:15
CPC Classifications
F; F04; F04C; F04C14/00; F04C14/18; F04C14/22; F04C14/223
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
366 words
Regulated pump with constant displacement volume, comprising housing means including a housing ring; a rotor mounted in said housing means for rotation about an axis, and including radial piston means; a control ring mounted in said housing means within said housing ring for movement in first and second opposite directions transverse to said axis, and surrounding said rotor so that the inner surface of said control ring is slidingly engaged by said piston means, and so that the outer surface of said control ring and the inner surface of said housing ring define first and second control spaces located on opposite sides of a plane passing through said axis transverse to said first and second directions; biasing means mounted in said housing means for biasing said control ring to move in said first direction to a first end position adjacent to said rotor on one side so that a working space is formed on the other side between said rotor and the inner surface of said control ring; said housing means having inlet and outlet ports in said working space, and a conduit connecting said outlet port with said first control space; outlet means for a consumer apparatus communicating with said second control space; throttling means formed by at least one of said rings and directly opening into said first and second control spaces so that at high rotary speeds the pressure differential between said first and second control spaces moves said control ring in said second direction against said biasing means toward the other side of said rotor whereby said working space is reduced for maintaining the displaced volume constant at different rotary speeds of said rotor, and whereby fluid pressure and friction of said piston means on said control ring produces a force acting in said second direction on said control ring; and a compensating device mounted in said housing ring and including a pressure responsive means communicating with said second control space and biased by the pressure in the same to engage said control ring and to bias the same in said first direction for compensating said force produced by said fluid pressure and friction of said piston means on said control ring.
Claim 2
Dependent Claim
366 words
Regulated pump with constant displacement volume, comprising housing means including a housing ring; a rotor mounted in said housing means for rotation about an axis, and including radial piston means; a control ring mounted in said housing means within said housing ring for movement in first and second opposite directions transverse to said axis, and surrounding said rotor so that the inner surface of said control ring is slidingly engaged by said piston means, and so that the outer surface of said control ring and the inner surface of said housing ring define first and second control spaces located on opposite sides of a plane passing through said axis transverse to said first and second directions; biasing means mounted in said housing means for biasing said control ring to move in said first direction to a first end position adjacent to said rotor on one side so that a working space is formed on the other side between said rotor and the inner surface of said control ring; said housing means having inlet and outlet ports in said working space, and a conduit connecting said outlet port with said first control space; outlet means for a consumer apparatus communicating with said second control space; throttling means formed by at least one of said rings and directly opening into said first and second control spaces so that at high rotary speeds the pressure differential between said first and second control spaces moves said control ring in said second direction against said biasing means toward the other side of said rotor whereby said working space is reduced for maintaining the displaced volume constant at different rotary speeds of said rotor, and whereby fluid pressure and friction of said piston means on said control ring produces a force acting in said second direction on said control ring; and a compensating device mounted in said housing ring and including a pressure responsive means communicating with said second control space and biased by the pressure in the same to engage said control ring and to bias the same in said first direction for compensating said force produced by said fluid pressure and friction of said piston means on said control ring.
Claim 3
Dependent Claim
33 words
Regulated pump as claimed in claim 1 wherein said throttling means includes two diametrically disposed throttles located in said plane and formed by portions of said housing ring and of said control ring.
Claim 4
Dependent Claim
39 words
Regulated pump as claimed in claim 1 comprising a pivot located in said plane and mounted in said housing means eccentric to said axis for supporting said control ring for angular movement between said first and second end positions.
Claim 5
Dependent Claim
21 words
Regulated pump as claimed in claim 1, wherein said throttling means includes adjusting means for varying the throttling flow cross section.
Claim 6
Dependent Claim
20 words
Regulated pump as claimed in claim 1, wherein said biassing means includes a spring acting on said pressure responsive meaNs.
Claim 7
Dependent Claim
91 words
Regulated pump as claimed in claim 1 wherein said compensating device including a cylinder formed in said housing ring, a pressure responsive piston in said cylinder having a portion projecting into engagement with said control ring, and a duct formed in said housing means connecting said cylinder with said second control space so that said control ring is biassed to move in said first direction for compensating a torque produced thereon by fluid pressure, and by friction of said piston means and acting in said second direction on said control ring.
Claim 8
Dependent Claim
27 words
Regulated pump as claimed in claim 6, wherein said projecting portion of said piston of said compensating device acts on said control ring in substantially tangential direction.
Claim 9
Dependent Claim
97 words
Regulated pump as claimed in claim 6 comprising at least two compensating devices located on opposite sides of another plane passing through said axis perpendicularly to said plane; wherein said control ring has two diametrically disposed outward projecting piston portions located in said other plane; wherein said housing ring has two diametrically disposed bores receiving said piston portions for guiding said control ring for straight movement in said first and second directions; and wherein said biassing means is a spring located in one of said bores for urging said control ring to move in said first direction.
Claim 10
Dependent Claim
53 words
Regulated pump as claimed in claim 1, comprising a pivot located in said plane and mounted in said housing means eccentric to said axis for supporting said control ring for angular movement between said first and second end positions; and wherein said throttling means includes two diametrically disposed throttles located in said plane.
Claim 11
Dependent Claim
53 words
Regulated pump as claimed in claim 1, comprising a pivot pin located in said plane supported in said housing; and wherein said control ring has a bearing bore in which said pivot pin is located eccentric to said axis for supporting said control ring for angular movement between said first and second positions.
Claim 12
Dependent Claim
35 words
Regulating pump as claimed in claim 10, wherein said compensating device includes means for guiding said pressure responsive means tangentially to a circle having the center in said pivot pin and passing through said axis.
Claim 13
Dependent Claim
20 words
Regulated pump as claimed in claim 1, wherein said throttling means include two diametrically disposed throttles located in said plane.
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US2635551A
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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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |