US3627451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic transformer
Assignee: PepsiAmericas Inc
•
Filing: 1970-04-01
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Granted: 1971-12-14
•
Expires: 1990-04-01
Abstract
Abstract A bidirectional hydraulic transformer for transferring power to or from either one of two separate and isolated hydraulic control circuits without the transfer of any hydraulic fluid between the circuits. The transformer comprises two axial piston pump/motor devices, the rotors of which are interlocked so that they rotate together, one acting as a motor to drive the other as a pump and supply power to the pump connected circuit.
Inventors
- 👤 Herbert H Kouns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:24
CPC Classifications
F; F15; F15B; F15B3/00; F01; F01B; F01B3/00; F01B3/0032; F01B3/0035; F01B3/0044; F01B3/0055
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
222 words
A hydraulic transformer for use in combination with two separate hydraulic circuits for transferring power from one of said circuits to the other without the flow of any fluid between the two, which transformer comprises two pump/motor devices of the axial piston type, each of said devices having a body including means presenting a valve surface, a high pressure port and a low pressure port spaced therefrom entering on each of said valve surfaces, a rotatable barrel in each of said bodies, said barrels being mechanically interconnected so that they rotate together, said barrels engaging said valve surfaces and containing reciprocal pistons in cylinders defined in said barrels, said cylinders communicating sequentially with said high pressure port and said low pressure port as said barrels are rotated, the improvement which comprises a third port entering on at least one of said valve surfaces at a position spaced between said high pressure port and said low pressure port of at least one pump/motor device, and means including a valve for connecting said third port to said high pressure port of said one pump/motor device when said one pump/motor device is operated as a motor and for disconnecting said third port from said high pressure port and connecting it to a low pressure line when said one pump/motor device is operated as a pump.
Claim 2
Dependent Claim
222 words
A hydraulic transformer for use in combination with two separate hydraulic circuits for transferring power from one of said circuits to the other without the flow of any fluid between the two, which transformer comprises two pump/motor devices of the axial piston type, each of said devices having a body including means presenting a valve surface, a high pressure port and a low pressure port spaced therefrom entering on each of said valve surfaces, a rotatable barrel in each of said bodies, said barrels being mechanically interconnected so that they rotate together, said barrels engaging said valve surfaces and containing reciprocal pistons in cylinders defined in said barrels, said cylinders communicating sequentially with said high pressure port and said low pressure port as said barrels are rotated, the improvement which comprises a third port entering on at least one of said valve surfaces at a position spaced between said high pressure port and said low pressure port of at least one pump/motor device, and means including a valve for connecting said third port to said high pressure port of said one pump/motor device when said one pump/motor device is operated as a motor and for disconnecting said third port from said high pressure port and connecting it to a low pressure line when said one pump/motor device is operated as a pump.
Claim 3
Dependent Claim
51 words
The transformer of claim 1 in which said low pressure port of said one pump/motor device is angularly longer than said high pressure port of said one pump/motor device and is therefore connectable to said cylinders through a greater angular arc of movement of said barrel than the high pressure port.
Claim 4
Dependent Claim
36 words
The transformer of claim 2 in which said third port of said one piston/motor device is located approximately equidistantly from one end of said high pressure port and an adjacent end of said low pressure port.
Claim 5
Dependent Claim
212 words
A hydraulic transformer for use in combination with two separate hydraulic circuits for transferring power from either one of said two circuits to the other circuit without the flow of any fluid between the two, which transformer comprises two pump/motor devices of the axial piston type, each of said devices having a body including means presenting a valve surface, a high pressure port and a low pressure port spaced therefrom entering on each of said valve surfaces, a rotatable barrel in each of said bodies, said barrels being mechanically interconnected so that they rotate together, said barrels engaging said valve surfaces and containing reciprocal pistons in cylinders defined in said barrels, said cylinders communicating sequentially with said high pressure port and said low pressure port as said barrels are rotated, the improvement which comprises a third port entering on each of said valve surfaces at a position spaced between said high pressure port and said low pressure port, and means including a valve for connecting each of said third ports to said high pressure ports when said pump/motor device is operated as a motor and for disconnecting said third port from said high pressure port and connecting it to a low pressure line when said pump/motor device is operated as a pump.
Claim 6
Dependent Claim
212 words
A hydraulic transformer for use in combination with two separate hydraulic circuits for transferring power from either one of said two circuits to the other circuit without the flow of any fluid between the two, which transformer comprises two pump/motor devices of the axial piston type, each of said devices having a body including means presenting a valve surface, a high pressure port and a low pressure port spaced therefrom entering on each of said valve surfaces, a rotatable barrel in each of said bodies, said barrels being mechanically interconnected so that they rotate together, said barrels engaging said valve surfaces and containing reciprocal pistons in cylinders defined in said barrels, said cylinders communicating sequentially with said high pressure port and said low pressure port as said barrels are rotated, the improvement which comprises a third port entering on each of said valve surfaces at a position spaced between said high pressure port and said low pressure port, and means including a valve for connecting each of said third ports to said high pressure ports when said pump/motor device is operated as a motor and for disconnecting said third port from said high pressure port and connecting it to a low pressure line when said pump/motor device is operated as a pump.
Claim 7
Dependent Claim
47 words
The transformer of claim 1 in which said low pressure port of each of said pump/motor devices is angularly longer than said high pressure port and is therefore connectable to said cylinders through a greater angular arc of movement of said barrel than the high pressure port.
Claim 8
Dependent Claim
37 words
The transformer of claim 2 in which said third port of each of said pump/motor devices is located approximately equidistantly from one end of said high pressure port and an adjacent end of said low pressure port.
Claim 9
Dependent Claim
197 words
A hydraulic transformer for use in combination with two separate hydraulic circuits for transferring power from either one of said two circuits to the other circuit without the flow of any fluiD between the two, which transformer comprises two pump/motor devices of the axial piston type, each of said devices having a body including means presenting a valve surface, a high pressure port and a low pressure port spaced therefrom entering on each of said valve surfaces, a rotatable barrel in each of said bodies, said barrels being mechanically interconnected so that they rotate together, said barrels engaging said valve surfaces and containing reciprocal pistons in cylinders defined in said barrels, said cylinders communicating sequentially with said high pressure port and said low pressure port as said barrels are rotated, the improvement which comprises pressure equalizing means for developing approximately the same pressure on the outlet of that one of the devices which is operating as a pump as is directed into the inlet of the other device to drive the other device as a motor by diverting to a low pressure line a portion of the flow through that device which is acting as a pump.
Claim 10
Dependent Claim
197 words
A hydraulic transformer for use in combination with two separate hydraulic circuits for transferring power from either one of said two circuits to the other circuit without the flow of any fluiD between the two, which transformer comprises two pump/motor devices of the axial piston type, each of said devices having a body including means presenting a valve surface, a high pressure port and a low pressure port spaced therefrom entering on each of said valve surfaces, a rotatable barrel in each of said bodies, said barrels being mechanically interconnected so that they rotate together, said barrels engaging said valve surfaces and containing reciprocal pistons in cylinders defined in said barrels, said cylinders communicating sequentially with said high pressure port and said low pressure port as said barrels are rotated, the improvement which comprises pressure equalizing means for developing approximately the same pressure on the outlet of that one of the devices which is operating as a pump as is directed into the inlet of the other device to drive the other device as a motor by diverting to a low pressure line a portion of the flow through that device which is acting as a pump.
Claim 11
Dependent Claim
101 words
The hydraulic transformer of claim 7 in which said pressure equalizing means comprises a third port entering on each of said valve surfaces at a position spaced between said high pressure port and said low pressure port, and means including a valve for connecting each of said third ports to one of said high pressure ports or to a low pressure line, said third port of one device being connected to the high pressure port of the device when the device is operated as a motor and connected to the low pressure line when the device is operated as a pump.
Claim 12
Dependent Claim
47 words
The transformer of claim 8 in which said low pressure port of each of said pump/motor devices is angularly longer than said high pressure port and is therefore connectable to said cylinders through a greater angular arc of movement of said barrel than the high pressure port.
Claim 13
Dependent Claim
37 words
The transformer of claim 9 in which said third port of each of said pump/motor devices is located approximately equidistantly from one end of said high pressure port and an adjacent end of said low pressure port.
Claim 14
Dependent Claim
221 words
A hydraulic transformer for use in combination with two separate hydraulic circuits for transferring power from either one of said two circuits to the other circuit without the flow of any fluid between the two, which transformer comprises two pump/motor devices of the axial piston type, each of said devices having a body including means presenting a valve surface, a high pressure port and a low pressure port spaced therefrom entering on each of said valve surfaces, a rotatable barrel in each of said bodies, said barrels being mechanically interconnected so that they rotate together, said barrels engaging said valve surfaces and containing reciprocal pistons in cylinders defined in said barrels, said cylinders communicating sequentially with said high pressure port and said low pressure port as said barrels are rotated, the improvement which comprises pressure equalizing means for developing approximately the same pressure on the outlet of that one of the devices which is operating as a pump as is directed into the inlet of the other device to drive the other device as a motor, said pressure equalizing means being operable to maintain a first rate of flow of fluid into the one device when it is operated as a motor and to maintain a second lesser rate of flow from the device when it is operated as a pump.
Claim 15
Dependent Claim
221 words
A hydraulic transformer for use in combination with two separate hydraulic circuits for transferring power from either one of said two circuits to the other circuit without the flow of any fluid between the two, which transformer comprises two pump/motor devices of the axial piston type, each of said devices having a body including means presenting a valve surface, a high pressure port and a low pressure port spaced therefrom entering on each of said valve surfaces, a rotatable barrel in each of said bodies, said barrels being mechanically interconnected so that they rotate together, said barrels engaging said valve surfaces and containing reciprocal pistons in cylinders defined in said barrels, said cylinders communicating sequentially with said high pressure port and said low pressure port as said barrels are rotated, the improvement which comprises pressure equalizing means for developing approximately the same pressure on the outlet of that one of the devices which is operating as a pump as is directed into the inlet of the other device to drive the other device as a motor, said pressure equalizing means being operable to maintain a first rate of flow of fluid into the one device when it is operated as a motor and to maintain a second lesser rate of flow from the device when it is operated as a pump.
Claim 16
Dependent Claim
101 words
The hydraulic transformer of claim 11 in which said pressure equalizing means comprises a third port entering on each of said valve surfaces at a position spaced between said high pressure port and said low pressure port, and means including a valve for connecting each of said third ports to one of said high pressure ports or to a low pressure line, said third port of one device being connected to the high pressure port of the device when the device is operated as a motor and connected to the low pressure line when the device is operated as a pump.
Claim 17
Dependent Claim
47 words
The transformer of claim 12 in which saId low pressure port of each of said pump/motor devices is angularly longer than said high pressure port and is therefore connectable to said cylinders through a greater angular arc of movement of said barrel than the high pressure port.
Claim 18
Dependent Claim
36 words
The transformer of claim 13 in which said third port of each said pump/motor devices is located approximately equidistantly from one end of said high pressure port and an adjacent end of said low pressure port.
References Cited (Backward Citations)
US3369491A
Cited
US3405641A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |