Variable radial fluid device with counteracting cams
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F04B-001/06
F04B-009/04
F04B-019/02
F04B-023/06
F04B-049/00
F04B-049/16
출원번호
US-0532044
(2012-06-25)
등록번호
US-9399984
(2016-07-26)
발명자
/ 주소
Fenny, Carlos A.
Sobel, James E.
출원인 / 주소
Bell Helicopter Textron Inc.
대리인 / 주소
Bell Helicopter Textron Inc.
인용정보
피인용 횟수 :
0인용 특허 :
5
초록▼
According to one embodiment, a radial fluid device comprises a cylinder block, a first plurality of pistons, a second plurality of pistons, a first cam, a second cam, and a cam rotation device. Each of the first plurality of pistons are slidably received within a different one of a first plurality o
According to one embodiment, a radial fluid device comprises a cylinder block, a first plurality of pistons, a second plurality of pistons, a first cam, a second cam, and a cam rotation device. Each of the first plurality of pistons are slidably received within a different one of a first plurality of radially extending cylinders. Each of the second plurality of pistons are slidably received within a different one of a second plurality of radially extending cylinders. The first cam is disposed about the first plurality of radially extending cylinders. The second cam is disposed about the second plurality of radially extending cylinders. The cam rotation device is coupled to the first cam and the second cam. The cam rotation device is operable to rotate the first cam in a first direction and the second cam in a second direction.
대표청구항▼
1. A radial fluid device comprising: a cylinder block comprising a first plurality of radially extending cylinders and a second plurality of radially extending cylinders, wherein the cylinder block is mounted for rotation;a first plurality of cylindrical pistons each slidably received within a diffe
1. A radial fluid device comprising: a cylinder block comprising a first plurality of radially extending cylinders and a second plurality of radially extending cylinders, wherein the cylinder block is mounted for rotation;a first plurality of cylindrical pistons each slidably received within a different one of the first plurality of radially extending cylinders, wherein each cylindrical piston includes: a radially extending aperture; anda shoe configured to slide along a surface of a first cam that has two or more lobes configured such that the shoe completes two or more sinusoidal strokes per revolution of the cylinder block, the shoe having a rounded forward edge and a rounded trailing edge, the forward edge being the forward most edge of the shoe when the shoe experiences movement, wherein the rounded forward and trailing edges form two separate contact surfaces with the first cam and are separated by an elongated portion of the shoe, the trailing edge being the rearmost edge of the shoe when the shoe experiences movement, the first cam being disposed about the first plurality of radially extending cylinders;a second plurality of cylindrical pistons each slidably received within a different one of the second plurality of radially extending cylinders, wherein each cylindrical piston includes: a radially extending aperture; anda shoe configured to slide along a surface of a second cam that has two or more lobes configured such that the shoe completes two or more sinusoidal strokes per revolution of the cylinder block, the shoe having a rounded forward edge and a rounded trailing edge, the forward edge being the forward most edge of the shoe when the shoe experiences movement, wherein the rounded forward and trailing edges form two separate contact surfaces with the second cam and are separated by an elongated portion of the shoe, the trailing edge being the rearmost edge of the shoe when the shoe experiences movement, the second cam being disposed about the second plurality of radially extending cylinders;a passageway comprising: a first opening in fluid communication with at least one of the first plurality of radially extending cylinders;a second opening in fluid communication with at least one of the second plurality of radially extending cylinders; anda third opening alternating between being in fluid communication with a first fluid port and a second fluid port, wherein one of the first and second fluid ports is an inlet and the other of the first and second fluid ports is an exhaust; anda cam rotation device coupled to the first cam and the second cam, the cam rotation device operable to rotate the first cam in a first direction and the second cam in a second direction. 2. The radial fluid device of claim 1, wherein the cam rotation device is operable to rotate the first cam in the second direction and the second cam in the first direction. 3. The radial fluid device of claim 1, wherein the first direction is with the rotation of the cylinder block, and the second direction is against the rotation of the cylinder block. 4. The radial fluid device of claim 1, the cam rotation device mechanically linking the first cam to the second cam such that rotating the first cam in the first direction causes the second cam to rotate in the second direction. 5. The radial fluid device of claim 1, wherein rotating the first cam changes when each cylindrical piston of the first plurality of cylindrical pistons begins its stroke. 6. The radial fluid device of claim 5, wherein changing when each cylindrical piston of the first plurality of cylindrical pistons begins its strokes does not change the displacement distance of the strokes. 7. The radial fluid device of claim 1, wherein the cam rotation device is operable to rotate the first cam while the cylinder block is rotating. 8. The radial fluid device of claim 1, further comprising: a pressure regulator coupled to the cam rotation device, the pressure regulator operable to instruct the cam rotation device to rotate the first cam in the first direction if an operating pressure is greater than a threshold and instruct the cam rotation device to rotate the first cam in the second direction if the operating pressure is less than the threshold. 9. The radial fluid device of claim 8, wherein rotating the first cam in the first direction increases a volume rate of fluid flowing through the radial fluid device. 10. The radial fluid device of claim 8, the pressure regulator operable to instruct the cam rotation device by transmitting electrical signals to the cam rotation device. 11. The radial fluid device of claim 8, the pressure regulator comprising a control piston operable to instruct the cam rotation device by moving the cam rotation device from a first position to a second position. 12. The radial fluid device of claim 1, wherein rotating the first cam in the first direction and the second cam in the second direction is operable to convert the first fluid port from the inlet to the exhaust and convert the second fluid port from the exhaust to the inlet. 13. The radial fluid device of claim 1, the cam rotation device comprising: a first gear in contact with the first cam;a second gear in contact with the second cam; anda reverse rotation gear coupled to the first gear and the second gear and configured to translate motion by the first gear into motion in an opposite direction by the second gear. 14. The radial fluid device of claim 1, the cam rotation device comprising: a first worm gear in contact with the first cam;a first reverse rotation gear coupled to the first worm gear;a second worm gear in contact with the second cam; anda second reverse rotation gear coupled to the second worm gear and in contact with the first reverse rotation gear. 15. The radial fluid device of claim 1, the first cam comprising a first lug;the second cam comprising a second lug; andthe cam rotation device comprising: a first yoke coupled to the first lug;a second yoke coupled to the second lug and to the first yoke;a control piston coupled to the first yoke and operable to transmit linear movements to the first yoke; anda spring coupled to the first yoke opposite the control piston. 16. The radial fluid device of claim 1, wherein the passageway is disposed within and configured to rotate with the cylinder block. 17. The radial fluid device of claim 1, wherein each radially extending aperture is located in an interior portion of its corresponding cylindrical piston and is configured to allow fluid communication between the passageway and an outer portion of its radially extending cylinder. 18. A method of adjusting fluid flow in a radial fluid device, comprising: providing a cylinder block assembly comprising: a cylinder block comprising a first plurality of radially extending cylinders and a second plurality of radially extending cylinders, wherein the cylinder block is mounted for rotation;a first plurality of cylindrical pistons each slidably received within a different one of the first plurality of radially extending cylinders, wherein each cylindrical piston includes: a radially extending aperture; anda shoe configured to slide along a surface of a first cam that has two or more lobes configured such that the shoe completes two or more sinusoidal strokes per revolution of the cylinder block, the shoe having a rounded forward edge and a rounded trailing edge, the forward edge being the forward most edge of the shoe when the shoe experiences movement, the trailing edge being the rearmost edge of the shoe when the shoe experiences movement, wherein the rounded forward and trailing edges form two separate contact surfaces with the first cam and are separated by an elongated portion of the shoe, the first cam being disposed about the first plurality of radially extending cylinders;a second plurality of cylindrical pistons each slidably received within a different one of the second plurality of radially extending cylinders, wherein each cylindrical piston includes: a radially extending aperture; anda shoe configured to slide along a surface of a second cam that has two or more lobes configured such that the shoe completes two or more sinusoidal strokes per revolution of the cylinder block, the shoe having a rounded forward edge and a rounded trailing edge, the forward edge being the forward most edge of the shoe when the shoe experiences movement, the trailing edge being the rearmost edge of the shoe when the shoe experiences movement, wherein the rounded forward and trailing edges form two separate contact surfaces with the second cam and are separated by an elongated portion of the shoe, the second cam being disposed about the second plurality of radially extending cylinders; anda passageway comprising: a first opening in fluid communication with at least one of the first plurality of radially extending cylinders;a second opening in fluid communication with at least one of the second plurality of radially extending cylinders; anda third opening alternating between being in fluid communication with a first fluid port and a second fluid port, wherein one of the first and second fluid ports is an inlet and the other of the first and second fluid ports is an exhaust;rotating the first cam in a first direction; androtating the second cam in a second direction. 19. The method of claim 18, further comprising rotating the first cam in the second direction and rotating the second cam in the first direction. 20. The method of claim 18, wherein the first cam is mechanically linked to the second cam such that rotating the first cam in the first direction causes the second cam to rotate in the second direction. 21. The method of claim 18, wherein rotating the first cam changes when each cylindrical piston of the first plurality of cylindrical pistons begins its stroke. 22. The method of claim 21, wherein changing when each cylindrical piston of the first plurality of cylindrical pistons begins its strokes does not change the displacement distance of the strokes. 23. The method of claim 18, wherein rotating the first cam in the first direction comprises rotating the first cam while the cylinder block is rotating. 24. The method of claim 18, wherein rotating the first cam comprises rotating the first cam in the first direction if an operating pressure is greater than a threshold and rotating the first cam in the second direction if the operating pressure is less than the threshold. 25. The method of claim 24, wherein rotating the first cam in the first direction increases a volume rate of fluid flowing through the radial fluid device. 26. The method of claim 18, further comprising: providing a fluid flow from the first fluid port to the at least one of the first plurality of cylindrical pistons; andconverting the first fluid port from an inlet to an exhaust by rotating the first cam in the first direction. 27. The method of claim 18, wherein each radially extending aperture is located in an interior portion of its corresponding cylindrical piston and is configured to allow fluid communication between the passageway and an outer portion of its radially extending cylinder.
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