US3639085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromotor and pump unit
Assignee: Robert Bosch GmbH
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Filing: 1970-05-21
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Granted: 1972-02-01
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Expires: 1990-05-21
Abstract
Abstract An electromotor and hydraulic pump unit with a sealed housing has a common drive shaft projecting with one end into a balancing pressure chamber in the pump stator. Pressure fluid flows along the shaft into a cavity of the housing in which the electromotor and the other shaft end are located so that the motor is cooled, the shaft bearings in the cavity lubricated by the pressure fluid, and the axial force acting on the bearings is reduced.
Inventors
- 👤 Richard Bertsch
- 👤 Paul Fussner
- 👤 Manfred Glaser
- 👤 Hermann Nusser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:36
CPC Classifications
F; F04; F04C; F04C11/00; F04C11/008; F02; F02M; F02M37/00; F02M37/04; F02M37/08; F04C2/00; F04C2/30; F04C2/34; F04C2/344; F04C2/3441; F04C2/3445
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
306 words
Electromotor and pump unit comprising an electromotor and a pump including motor and pump rotors, a common drive shaft supporting said rotors, an motor and pump stator means surrounding said rotors, respectively, said pump stator means forming a pressure space having a pressure fluid outlet and a suction space having an inlet, and also forming a balancing chamber communicating with said pressure space, said pump stator means including a support part mounted on said housing means, a connector part having said inlet and outlet, and a stator plate between said support part and said connector part and being formed with a central opening in which said pump rotor is located, said connector part having a surface in sealing contact with one side of said stator plate and being formed with said pressure space and said balancing chamber which communicate with said central opening for receiving pressure fluid, said support part being formed with a bore through which said drive shaft projects into said balancing chamber with the end of an end portion carrying said pump rotor in said central opening; and sealed housing means supporting said motor and pump stator means, and including a motor housing forming with said pump stator means a cavity, and bearing means in said cavity for supporting said common drive shaft in a position in which said end of the same is located in said balancing chamber while the other end of the same is located in said cavity of said motor housing so that pressure fluid from said pressure space flows through said balancing chamber and said bore along said drive shaft into said cavity so that said cavity is filled with the pressure fluid pumped by said pump whereby said electromotor is cooled, said drive shaft is axially balanced, and said bearing means are lubricated by said pressure fluid.
Claim 2
Dependent Claim
306 words
Electromotor and pump unit comprising an electromotor and a pump including motor and pump rotors, a common drive shaft supporting said rotors, an motor and pump stator means surrounding said rotors, respectively, said pump stator means forming a pressure space having a pressure fluid outlet and a suction space having an inlet, and also forming a balancing chamber communicating with said pressure space, said pump stator means including a support part mounted on said housing means, a connector part having said inlet and outlet, and a stator plate between said support part and said connector part and being formed with a central opening in which said pump rotor is located, said connector part having a surface in sealing contact with one side of said stator plate and being formed with said pressure space and said balancing chamber which communicate with said central opening for receiving pressure fluid, said support part being formed with a bore through which said drive shaft projects into said balancing chamber with the end of an end portion carrying said pump rotor in said central opening; and sealed housing means supporting said motor and pump stator means, and including a motor housing forming with said pump stator means a cavity, and bearing means in said cavity for supporting said common drive shaft in a position in which said end of the same is located in said balancing chamber while the other end of the same is located in said cavity of said motor housing so that pressure fluid from said pressure space flows through said balancing chamber and said bore along said drive shaft into said cavity so that said cavity is filled with the pressure fluid pumped by said pump whereby said electromotor is cooled, said drive shaft is axially balanced, and said bearing means are lubricated by said pressure fluid.
Claim 3
Dependent Claim
47 words
A unit as claimed in claim 1 wherein said balancing chamber in said connector part is concentric with said one end portion of said drive shaft; and wherein said connector part has a channel which extends in radial direction between said balancing chamber and said pressure space.
Claim 4
Dependent Claim
79 words
A unit as claimed in claim 1 wherein said support part is formed with a duct penetrating the same and having one end opening into said central opening and another end opening into said cavity; and comprising filter means for filtering impurities out of fluid flowing through said duct so that pressure fluid entering said cavity through said bore in said support part along said drive shaft flows through said filter means and said duct out of said cavity.
Claim 5
Dependent Claim
119 words
A unit as claimed in claim 3 wherein said pump rotor includes a rotary member secured to said drive shaft and formed with peripheral chambers, and rollers in said chambers; wherein said central opening has a circular innEr surface eccentric to the axis of said drive shaft and engaged by said rollers so that working spaces are formed between said pump rotor and said circular inner surface communicating with said pressure and suction spaces in said connector part; wherein said duct has said one open end communicating with said working spaces and the other open end thereof communicating with said cavity; and wherein said filter means are located in said cavity covering said other open end of said duct.
Claim 6
Dependent Claim
221 words
Electromotor and pump unit comprising an electromotor and a pump including motor and pump rotor, a common drive shaft supporting said rotors, and motor and pump stator means surrounding said rotors, respectively, said pump stator means forming a pressure space having a pressure fluid outlet and a suction space having an inlet, and also forming a balancing chamber communicating with said pressure space, said pump stator means including a return outlet; valve means spring-biassed to a throttling position connecting said pressure space with said return outlet, and being responsive to increased pressure in said pressure space to move to an operative position connecting said pressure space with said pressure fluid outlet; and sealed housing means supporting said motor and pump stator means, and including a motor housing forming with said pump stator means a cavity, and bearing means in said cavity for supporting said common drive shaft in a position in which one end of the same is located in said balancing chamber while the other end of the same is located in said cavity of said motor housing, said balancing chamber communicating with said cavity so that said cavity is filled with the pressure fluid pumped by said pump whereby said electromotor is cooled, said drive shaft is axially balanced, and said bearing means are lubricated by said pressure fluid.
Claim 7
Dependent Claim
221 words
Electromotor and pump unit comprising an electromotor and a pump including motor and pump rotor, a common drive shaft supporting said rotors, and motor and pump stator means surrounding said rotors, respectively, said pump stator means forming a pressure space having a pressure fluid outlet and a suction space having an inlet, and also forming a balancing chamber communicating with said pressure space, said pump stator means including a return outlet; valve means spring-biassed to a throttling position connecting said pressure space with said return outlet, and being responsive to increased pressure in said pressure space to move to an operative position connecting said pressure space with said pressure fluid outlet; and sealed housing means supporting said motor and pump stator means, and including a motor housing forming with said pump stator means a cavity, and bearing means in said cavity for supporting said common drive shaft in a position in which one end of the same is located in said balancing chamber while the other end of the same is located in said cavity of said motor housing, said balancing chamber communicating with said cavity so that said cavity is filled with the pressure fluid pumped by said pump whereby said electromotor is cooled, said drive shaft is axially balanced, and said bearing means are lubricated by said pressure fluid.
Claim 8
Dependent Claim
61 words
A unit as claimed in claim 5 wherein said pump stator means is formed with a valve bore; wherein said valve means include a valve slide movable in said valve bore, and two springs having different resilience abutting each other, one of said springs abutting said pump stator means and the other spring abutting said one spring and said valve slide.
Claim 9
Dependent Claim
50 words
A unit as claimed in claim 6 wherein the weaker spring is said other spring, and the harder spring is said one spring; including a spring plate between said springs; and a cap closing said valve bore, said one harder spring abutting said cap and thereby said pump stator means.
Claim 10
Dependent Claim
71 words
A unit as claimed in claim 5 wherein said pump stator means is formed with a channel connecting said pressure space with said pressure fluid outlet; and wherein said valve means has a valve portion closing said channel in said throttling position and opening the same in said operative position; and wherein said valve means has throttling means for connecting said pressure space with said return outlet in said throttling position.
Claim 11
Dependent Claim
93 words
A unit as claimed in claim 8 wherein said pump stator means is formed with a valve bore; wherein said valve means include a valve slide having said valve portion and said throttling means, said throttling means including a straight throttling channel extending in axial direction of said valve slide and two annular throttling channels extending around said valve slide and connected by said straight throttling channel, one of said annular throttling channels communicating with said return outlet, and the other annular throttling channel communicating in said throttling position with said pressure space.
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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |