A transmission for a vehicle includes a fixed displacement pump operable to produce a high pressure flow and a fixed displacement motor. A fluid flow path is disposed between the pump and the motor. The fluid flow path is integrated into a housing containing at least one of the pump and the motor. A
A transmission for a vehicle includes a fixed displacement pump operable to produce a high pressure flow and a fixed displacement motor. A fluid flow path is disposed between the pump and the motor. The fluid flow path is integrated into a housing containing at least one of the pump and the motor. A single control valve controls the direction and the speed of the motor.
대표청구항▼
What is claimed is: 1. A transmission for a vehicle, the transmission comprising: a fixed displacement pump operable to produce a high pressure flow; a fixed displacement motor; a fluid flow path between the pump and the motor, the fluid flow path integrated into a housing containing at least one o
What is claimed is: 1. A transmission for a vehicle, the transmission comprising: a fixed displacement pump operable to produce a high pressure flow; a fixed displacement motor; a fluid flow path between the pump and the motor, the fluid flow path integrated into a housing containing at least one of the pump and the motor; and a single control valve for controlling the direction and the speed of the motor, wherein the control valve includes a rotary valve plate and a stationary valve plate. 2. The transmission of claim 1, wherein the fixed displacement pump includes a fixed displacement gerotor. 3. The transmission of claim 2, wherein the fixed displacement motor includes a fixed displacement gerotor. 4. The transmission of claim 1, wherein the stationary plate includes a first aperture in fluid communication with a first side of the motor and a second aperture in fluid communication with a second side of the motor. 5. The transmission of claim 4, wherein the rotary valve plate includes a first movable aperture and a second movable aperture positioned such that rotation of the rotary valve plate in a first direction establishes a first fluid flow path from a high pressure inlet to an outlet to produce forward rotation of the motor, the first fluid flow path passing in order through the first movable aperture, the first aperture, the first side of the motor, the second side of the motor, the second aperture, and the second movable aperture, and rotation of the rotary valve plate in a second direction establishes a second fluid flow path from the high pressure inlet to the outlet to produce reverse rotation of the motor, the second fluid flow path passing in order through the second movable aperture, the second aperture, the second side of the motor, the first side of the motor, the first aperture, and the first movable aperture. 6. The transmission of claim 1, further comprising a flow compensating valve at least partially operable in response to a first pressure to direct a portion of the high pressure flow to a sump and the remainder of the high pressure flow to the motor. 7. The transmission of claim 6, wherein the flow compensating valve includes a biasing member positioned to bias the flow compensating valve toward a first position in which no flow is directed to the sump. 8. The transmission of claim 7, wherein the first pressure is substantially equal to a pump discharge pressure, and wherein the first pressure is directed to the flow compensating valve to bias the flow compensating valve toward a second position in which all of the high pressure flow is directed to the sump. 9. The transmission of claim 8, wherein a second pressure is directed to the flow compensating valve to bias the flow compensating valve toward the first position, the second pressure being substantially equal to a pressure of a signal flow of fluid from the control valve. 10. The transmission of claim 9, wherein the control valve, in a neutral position, defines a flow path that directs the signal flow of fluid to the sump such that the flow compensating valve is biased to the second position and all of the high pressure flow is directed to the sump. 11. The transmission of claim 6, wherein the motor, the pump, the control valve, and the flow compensating valve are disposed in the housing. 12. The transmission of claim 6, wherein the housing defines a portion of the control valve, the flow compensating valve, and the fluid flow path between the pump and the motor. 13. The transmission of claim 1, wherein the motor has a motor shaft and the pump has a pump shaft, the pump shaft being normal to the motor shaft. 14. A hydrostatic transmission for a vehicle, the hydrostatic transmission comprising: a fluid pump; a fluid motor; a rotary control valve configured to oscillate independent of the movement of the pump and the motor; a single control interface configured to control both a speed and a direction of the motor; and a linkage between the rotary control valve and the interface. 15. The hydrostatic transmission of claim 14, wherein the interface includes a lever configured to move in a linear path. 16. The hydrostatic transmission of claim 14, wherein the valve includes a valve gear, and wherein the linkage includes a lever and a second gear that engages the valve gear. 17. The hydrostatic transmission of claim 16, wherein the valve gear includes a bevel gear affixed to the valve, and wherein the second gear is a pinion gear. 18. The hydrostatic transmission of claim 14, wherein at least one of the pump and the motor has a fixed displacement. 19. The hydrostatic transmission of claim 14, wherein both the pump and the motor have fixed displacements. 20. The hydrostatic transmission of claim 14, wherein the pump is a gerotor type pump. 21. The hydrostatic transmission of claim 20, wherein the motor is a gerotor type motor. 22. The transmission of claim 14, wherein the rotary control valve includes a rotary valve plate and a stationary valve plate. 23. The transmission of claim 22, wherein the stationary plate includes a first aperture in fluid communication with a first side of the motor and a second aperture in fluid communication with a second side of the motor. 24. The transmission of claim 23, wherein the rotary valve plate includes a first movable aperture and a second movable aperture positioned such that rotation of the rotary valve plate in a first direction establishes a first fluid flow path from a high pressure inlet to an outlet to produce forward rotation of the motor, the first fluid flow path passing in order through the first movable aperture, the first aperture, the first side of the motor, the second side of the motor, the second aperture, and the second movable aperture, and rotation of the rotary valve plate in a second direction establishes a second fluid flow path from the high pressure inlet to the outlet to produce reverse rotation of the motor, the second fluid flow path passing in order through the second movable aperture, the second aperture, the second side of the motor, the first side of the motor, the first aperture, and the first movable aperture. 25. The transmission of claim 14, further comprising a flow compensating valve at least partially operable in response to a first pressure to direct a portion of the high pressure flow to a sump and the remainder of the high pressure flow to the motor. 26. The transmission of claim 25, wherein the flow compensating valve includes a biasing member positioned to bias the flow compensating valve toward a first position in which no flow is directed to the sump. 27. The transmission of claim 26, wherein the first pressure is substantially equal to a pump discharge pressure, and wherein the first pressure is directed to the flow compensating valve to bias the flow compensating valve toward a second position in which all of the high pressure flow is directed to the sump. 28. The transmission of claim 27, wherein a second pressure is directed to the flow compensating valve to bias the flow compensating valve toward the first position, the second pressure being substantially equal to a pressure of a signal flow of fluid from the control valve. 29. The transmission of claim 28, wherein the control valve, in a neutral position, defines a flow path that directs the signal flow of fluid to the sump such that the flow compensating valve is biased to the second position and all of the high pressure flow is directed to the sump. 30. The transmission of claim 25, wherein the motor, the pump, the control valve, and the flow compensating valve are disposed in the housing. 31. The transmission of claim 25, wherein the housing defines a portion of the control valve, the flow compensating valve, and the fluid flow path between the pump and the motor. 32. The hydrostatic transmission of claim 25, wherein the rotary valve plate is configured to oscillate through a range of about 40-80 degrees. 33. The hydrostatic transmission of claim 14, further comprising a flow compensating valve disposed downstream of the motor, wherein the flow compensating valve controls the speed of the motor based on a pressure of a flow fluid discharged from the pump. 34. The hydrostatic transmission of claim 14, wherein the rotary control valve includes a rotary valve plate configured to oscillate through a range of less than 180 degrees independently of the pump and the motor. 35. A hydrostatic transmission for a vehicle, the hydrostatic transmission comprising: a fluid pump; a fluid motor; a rotary control valve configured to oscillate independent of the movement of the pump and the motor; and a single control interface configured to control both a speed and a direction of the motor, wherein the motor, the pump and the control valve are disposed in a common housing. 36. The hydrostatic transmission of claim 35, wherein the housing defines a portion of a fluid flow path between the motor and the pump. 37. A transmission comprising: a pump configured to discharge a flow of fluid at a first pressure; a motor configured to rotate in response to a flow of fluid in a first flow path; a first valve movable to vary the flow of fluid in the first flow path; and a second valve movable between a first position and a second position at least partially in response to the first pressure to direct a portion of the flow of fluid to the first flow path and a remainder of the flow of fluid to a second flow path, wherein as the second valve moves toward the second position, additional flow is diverted from the second flow path to the first flow path to increase the speed of the motor, wherein the pump, the first valve, the motor, and the second valve are disposed in a common housing. 38. The transmission of claim 37 claim, wherein the housing at least partially defines the first flow path and the second flow path. 39. The transmission of claim 37, wherein the first valve controls a direction of fluid flow through the first flow path, and wherein the motor rotates in a first direction when the flow of fluid through the first flow path is in a first direction, and the motor rotates in a second direction when the flow of fluid through the first flow path is in a second direction. 40. The transmission of claim 37, further comprising an operator interface and a linkage between the interface and the first valve, the operator interface configured to enable an operator to control the first valve. 41. The transmission of claim 37, wherein at least one of the pump and the motor has a fixed displacement. 42. The transmission of claim 37, wherein both the pump and the motor have a fixed displacement. 43. The transmission of claim 37, wherein the pump is a gerotor type of pump, the motor is a gerotor type of motor, and the first valve is a rotary control valve. 44. The transmission of claim 37, wherein the first valve includes a rotary valve plate and a stationary valve plate. 45. The transmission of claim 44, wherein the stationary plate includes a first aperture in fluid communication with a first side of the motor and a second aperture in fluid communication with a second side of the motor. 46. The transmission of claim 45, wherein the rotary valve plate includes a first movable aperture and a second movable aperture positioned such that rotation of the rotary valve plate in a first direction establishes a first fluid flow path from a high pressure inlet to an outlet to produce forward rotation of the motor, the first fluid flow path passing in order through the first movable aperture, the first aperture, the first side of the motor, the second side of the motor, the second aperture, and the second movable aperture, and rotation of the rotary valve plate in a second direction establishes a second fluid flow path from the high pressure inlet to the outlet to produce reverse rotation of the motor, the second fluid flow path passing in order through the second movable aperture, the second aperture, the second side of the motor, the first side of the motor, the first aperture, and the first movable aperture. 47. The transmission of claim 46, wherein the second valve includes a biasing member positioned to bias the second valve toward a first position in which no flow is directed to the second flow path. 48. The transmission of claim 47, wherein the first pressure is directed to the second valve to bias the second valve toward a second position in which all of the flow is directed to the second flow path. 49. The transmission of claim 48, wherein a second pressure is directed to the second valve to bias the second valve toward the first position, the second pressure being substantially equal to a pressure of a signal flow of fluid from the first valve. 50. The transmission of claim 49, wherein the first valve, in a neutral position, defines a flow path that directs the signal flow of fluid to a sump such that second valve is biased to the second position and all of the flow is directed to the second flow path. 51. A hydrostatic transmission module for use with a small engine, the hydrostatic transmission module comprising: a module housing having a first chamber, and a second chamber in fluid communication with the first chamber; a fixed displacement pump disposed in the first chamber of the module housing, the fixed displacement pump operatively coupled to a crankshaft of the engine and configured to discharge a flow of fluid having a first pressure; a fixed displacement motor disposed in the second chamber of the module housing, the motor configured to rotate in response to the flow of fluid from the pump; a first valve operable to divide a flow of fluid from the pump into a first flow of fluid that flows to the motor and a second flow of fluid that flows to a sump; and a second valve disposed in the first flow and movable to vary the first flow of fluid to the motor. 52. The hydrostatic transmission of claim 51, wherein the pump is a gerotor type of pump, the motor is a gerotor type of motor, and the second valve is a rotary control valve. 53. The hydrostatic transmission of claim 51, wherein the pump, motor, first valve, and second valve are disposed in a single housing. 54. The hydrostatic transmission of claim 53, wherein the housing at least partially defines a first flow path for the first flow of fluid and a second flow path for the second flow of fluid. 55. The hydrostatic transmission of claim 51, further comprising an operator interface and a linkage between the interface and the second valve, the operator interface configured to enable an operator to control the second valve. 56. The hydrostatic transmission of claim 55, wherein the linkage includes a lever and a gear, and wherein the gear engages the valve. 57. The hydrostatic transmission of claim 51, wherein the second valve includes a rotary valve plate and a stationary valve plate. 58. The hydrostatic transmission of claim 57, wherein the stationary plate includes a first aperture in fluid communication with a first side of the motor and a second aperture in fluid communication with a second side of the motor. 59. The hydrostatic transmission of claim 58, wherein the rotary valve plate includes a first movable aperture and a second movable aperture positioned such that rotation of the rotary valve plate in a first direction establishes a first fluid flow path from a high pressure inlet to an outlet to produce forward rotation of the motor, the first fluid flow path passing in order through the first movable aperture, the first aperture, the first side of the motor, the second side of the motor, the second aperture, and the second movable aperture, and rotation of the rotary valve plate in a second direction establishes a second fluid flow path from the high pressure inlet to the outlet to produce reverse rotation of the motor, the second fluid flow path passing in order through the second movable aperture, the second aperture, the second side of the motor, the first side of the motor, the first aperture, and the first movable aperture. 60. The hydrostatic transmission of claim 51, wherein the first valve includes a biasing member positioned to bias the first valve toward a first position in which no flow is directed to the second flow of fluid. 61. The hydrostatic transmission of claim 60, wherein the first pressure is directed to the first valve to bias the first valve toward a second position in which all of the flow is directed to the second flow of fluid. 62. The hydrostatic transmission of claim 61, wherein a second pressure is directed to the first valve to bias the first valve toward the first position, the second pressure being substantially equal to a pressure of a signal flow of fluid from the second valve. 63. The hydrostatic transmission of claim 62, wherein the second valve, in a neutral position, defines a flow path that directs the signal flow of fluid to a sump such that first valve is biased to the second position and all of the flow is directed to the second flow of fluid. 64. The hydrostatic transmission of claim 51, wherein the second valve controls a direction of fluid flow to the motor. 65. The hydrostatic transmission of claim 52, wherein the motor rotates in a first direction when the fluid flow to the motor is in a first direction, and wherein the motor rotates in a second direction when the fluid flow to the motor is in a second direction.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (77)
Hunt Kenneth E. (Oconomowoc WI), Automatic return mechanism for hydrostatic transmission pressure release valve.
Norman E. Jolliff ; Richard T. Ruebusch ; Gordon C. Dowen ; Gary G. Twaddle, Hydrostatic transaxle having axial piston motor and method for manufacturing transaxles.
Hall James E. (Mt. Vernon OH) Bostic James H. (Bellville OH) Teeter Timothy L. (Richland OH) McGuire R. Donald (Fredericktown OH), Side shifting mechanism for transaxle.
Szulczewski Dennis E. (Eden Prairie MN) Casey James M. (Spencer IA) Jennen Mark S. (Eden Prairie MN), Variable displacement fluid pump with improved wideband neutral.
Gleasman Vernon E. (11 Pondview Dr. Pittsford NY 14534) Gleasman Keith E. (11 McCoord Woods Fairport NY 14450) McElroy ; II Arthur H. (Tulsa OK) Porter David W. (Broken Arrow OK), Variable hydraulic machine.
Crosby, Michael Tholan; Simon, Matthew Herman; Heathcoat, David Mark; Richardson, Jason Scot; Rector, John Matthew; Collett, Raymond E.; Malone, Somer Renee, Modular hydrostatic transmission.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.