The United States of America as represented by the Administrator of the US Environmental Protection Agency
대리인 / 주소
Seed IP Law Group, PLLC
인용정보
피인용 횟수 :
3인용 특허 :
77
초록▼
Two motors are arranged on opposing sides of a common shaft, drive plates of the pump/motors being rigidly coupled to each other, for example by being in hard contact with opposing sides of the shaft. By providing hard contact between the pump/motor drive plates and a common shaft, the drive plates
Two motors are arranged on opposing sides of a common shaft, drive plates of the pump/motors being rigidly coupled to each other, for example by being in hard contact with opposing sides of the shaft. By providing hard contact between the pump/motor drive plates and a common shaft, the drive plates and shaft act as a substantially solid element under compression, thereby substantially canceling axial loads generated by the pump/motors directly through the shaft. Residual axial loads are handled via bearings positioned on the shaft adjacent the drive plates in such a manner that the drive plates are in light contact only with the bearings. As a result, friction experienced by the bearings is substantially reduced as compared to conventional systems, thereby improving the efficiency of the system. To further reduce loads on the bearings, the pump/motors are arranged to ensure that they generate radial forces in a direction that is opposite to that of a separation force generated by a torque transferring device carried on the shaft and transmitted to the bearings. A common housing surrounding the two pump/motors, bearings and torque transferring device is divided into three regions, to segregate the bearings and torque transferring assembly from the pump/motors. In this manner, the regions containing the pump/motors are substantially filled with oil to, for example, fully lubricate the pump/motors, while the central region containing the gears and torque transferring device contains a significantly smaller volume of oil to simply splash lubricate the contents of the region, thereby reducing drag on the bearings. Control means are provided for selectively moving the two pump/motors substantially simultaneously to a selected displacement angle, using mechanical systems alone and in combination with hydraulic systems.
대표청구항▼
The invention claimed is: 1. An apparatus for changing the displacement of a plurality of bent-axis piston machines at substantially the same rate, the apparatus comprising: a first actuator arm coupled to a first bent-axis piston machine and coupled to or integrally formed with a first hydraulic p
The invention claimed is: 1. An apparatus for changing the displacement of a plurality of bent-axis piston machines at substantially the same rate, the apparatus comprising: a first actuator arm coupled to a first bent-axis piston machine and coupled to or integrally formed with a first hydraulic piston positioned within a first chamber; a second actuator arm coupled to a second bent-axis piston machine and coupled to or integrally formed with a second hydraulic piston positioned within a second chamber; a control valve coupled to a hydraulic fluid source and selectively operable to substantially simultaneously deliver a volume of hydraulic fluid to the first and the second chambers; and a mechanical link coupling the first and the second actuator arms and configured to constrain the first and second bent-axis piston machines to a common displacement. 2. The apparatus according to claim 1 wherein the first hydraulic piston divides the first chamber into a first upper region and a first lower region, and the second hydraulic piston divides the second chamber into a second upper region and a second lower region, and wherein the volume of hydraulic fluid is selectively delivered to either the first and second upper regions or the first and second lower regions to substantially simultaneously change the displacement angle of the first and second bent-axis piston machines. 3. An apparatus for changing the displacement of two bent-axis piston machines at substantially the same rate, the apparatus comprising: a first actuator arm coupled to a first bent-axis piston machine, a displacement of the first bent-axis piston machine being changed by movement of the first actuator arm; a second actuator arm coupled to a second bent-axis piston machine, a displacement of the second bent-axis piston machine being changed by movement of the second actuator arm; a common shaft having a first end rigidly coupled to a drive plate of the first bent-axis piston machine and a second end rigidly coupled to a drive plate of the second bent-axis piston machine; and a mechanical link coupled to the first and the second actuator arms and selectively powered to move the first and second actuator arms substantially simultaneously. 4. The apparatus according to claim 3 wherein the mechanical link is powered by an electrical power source. 5. The apparatus according to claim 3 wherein the mechanical link is powered by a hydraulic power source. 6. The apparatus according to claim 3 wherein the mechanical link is powered by an internal combustion engine. 7. The apparatus according to claim 3 wherein the mechanical link is mechanically powered. 8. An apparatus for changing the displacement of a plurality of bent-axis piston machines at substantially the same rate, the apparatus comprising: a first actuator arm coupled to a first bent-axis piston machine and to a first gear rack; a second actuator arm coupled to a second bent-axis piston machine and to a second gear rack; and a shaft having a first gear coupled to the first gear rack and a second gear coupled to the second gear rack, the shaft being selectively powered to rotate, the first and second gear racks traveling with the rotation of the shaft to change the displacement of the bent-axis piston machines. 9. An apparatus comprising: a first pump/motor; a second pump/motor; and a control unit configured to selectively change a displacement of the first and second pump/motors simultaneously to a selected displacement angle, the control unit including a feedback loop to ensure that the pump/motors are stroked in unison. 10. An apparatus comprising: a first pump/motor including a first drive plate, the first pump/motor coupled to a first actuator, a displacement of the first pump/motor being selectively varied by moving the first actuator; a second pump/motor including a second drive plate, the second pump/motor coupled to a second actuator, a displacement of the second pump/motor being selectively varied by moving the second actuator; a common shaft having first and second ends, the first drive plate being rigidly coupled to the first end of the common shaft and the second drive plate being rigidly coupled to the second end of the common shaft; and a control circuit with feedback loop coupled to the actuators, the control circuit selectively moving the first and second actuators substantially simultaneously to a desired position. 11. A method for changing the displacement of a plurality of bent-axis piston machines at substantially the same rate, the method comprising: coupling a first actuator arm to a first bent-axis piston machine and to a mechanical link; coupling a second actuator arm to a second bent-axis piston machine and to the mechanical link; selectively moving the first bent-axis piston machine to a desired displacement; and transmitting the movement to the second bent-axis piston machine via the mechanical link so as to move the second bent-axis piston machine to the desired displacement. 12. A method for changing the displacement of a first and second pump/motor substantially simultaneously, comprising: monitoring a location of the first pump/motor while moving the first pump/motor to a first desired position; monitoring a location of the second pump/motor while moving the second pump/motor to a second desired position; and adjusting a rate of motion of one or both of the pump/motors as needed to ensure that the first and second pump/motors move to the first and second desired positions substantially simultaneously.
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이 특허에 인용된 특허 (77)
Gray ; Jr. Charles L. (Pinckney MI) Hellman Karl H. (Ann Arbor MI), Accumulator engine.
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Tankersley Jerome B. (Fredericksburg VA) Boothe Richard W. (Roanoke VA) Konrad Charles E. (Roanoke VA), Electric vehicle drive train with direct coupling transmission.
Heath Ronald A. (Warley GBX) Llewellyn-Jones Thomas (Gloucester GBX) Robins Brian (Solihull GBX) Smith Trevor S. (Sutton Coldfield GBX), Regenerative pump having movable walls adjacent opposing faces of the impeller.
Gray ; Jr. Charles (4323 Cordley Lake Rd. Pinckney MI 48169) Hellmann Karl H. (2690 Overridge Ann Arbor MI 48104) Rogers Gary W. (610 Linden Rd. Birmingham MI 48009) Hilger Ulrich (Virchowstrasse 20 , Spark-ignited reciprocating piston engine having a subdivided combustion chamber.
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