IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0128126
(2002-04-23)
|
우선권정보 |
FR-0005424 (2001-04-23) |
발명자
/ 주소 |
- Bigo, Louis
- Mangano, Alain
- Raisin, Jean-Philippe
- Ruzicka, Daniel
|
출원인 / 주소 |
- Poclain Hydraulics Industrie
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
8 인용 특허 :
3 |
초록
▼
A hydraulic circuit for the hydrostatic transmission of a vehicle, said hydraulic circuit comprising at least one hydraulic motor, two main ducts, a parking brake having brake means, brake release control means suitable for feeding the brake release chamber from a first brake release fluid source, a
A hydraulic circuit for the hydrostatic transmission of a vehicle, said hydraulic circuit comprising at least one hydraulic motor, two main ducts, a parking brake having brake means, brake release control means suitable for feeding the brake release chamber from a first brake release fluid source, and means for connecting said chamber to a unpressurized reservoir. The circuit has a single short-circuit and selection valve having two main ports connected to respective ones of the two main ducts, and two selection ports connected respectively to the brake release chamber and to the brake release duct, and control means for controlling said valve, which control means are suitable for causing the valve to take up a first configuration in which the main ports are mutually isolated while the selection ports are interconnected, and for causing it to take up a second configuration in which the main ports are interconnected while the selection ports are mutually isolated.
대표청구항
▼
A hydraulic circuit for the hydrostatic transmission of a vehicle, said hydraulic circuit comprising at least one hydraulic motor, two main ducts, a parking brake having brake means, brake release control means suitable for feeding the brake release chamber from a first brake release fluid source, a
A hydraulic circuit for the hydrostatic transmission of a vehicle, said hydraulic circuit comprising at least one hydraulic motor, two main ducts, a parking brake having brake means, brake release control means suitable for feeding the brake release chamber from a first brake release fluid source, and means for connecting said chamber to a unpressurized reservoir. The circuit has a single short-circuit and selection valve having two main ports connected to respective ones of the two main ducts, and two selection ports connected respectively to the brake release chamber and to the brake release duct, and control means for controlling said valve, which control means are suitable for causing the valve to take up a first configuration in which the main ports are mutually isolated while the selection ports are interconnected, and for causing it to take up a second configuration in which the main ports are interconnected while the selection ports are mutually isolated. said vertical drive shaft and extending axially and upwardly away therefrom, said retaining bolt having a threaded portion adjacent the distal end of said vertical drive shaft and an unthreaded portion upwardly therefrom; an upper hub having a central bore therethrough, said bore being threaded to engage the threaded portion of said retaining bolt, said upper hub including a disc member carrying at least one knife to sever standing crop material, said threaded portion of said retaining bolt and said threaded bore being engaged such that rotation of said upper hub in said first direction forces said upper hub into more intimate contact with said lower hub; a shear mechanism operable between said upper and lower hubs such that torque is transferred from said drive shaft through said lower hub and shear mechanism to said upper hub and said disc member, whereby when said knife encounters sufficient force to cause said shear mechanism to fail, said second hub moves in a second direction relative to said retaining bolt, opposite said first direction, causing said second hub to move upwardly along the axis of said retaining bolt away from said first hub. 2. The disc cutterbar of claim 1 wherein: the relative axial length of the unthreaded portion of said retaining bolt and the thickness of said upper hub are such that said second hub can freely rotate on said unthreaded portion when said upper hub has moved sufficiently upwardly along the axis of said retaining bolt away from said lower hub that the threaded bore in said upper hub and the threaded portion of said upper hub are no longer engaged. 3. The disc cutterbar of claim 2 wherein: said shear mechanism comprises a ball and detent mechanism made up of a detent in the upper surface of said lower hub and bore through said upper hub, said bore containing a mating ball extending partially through the lower surface of said upper hub, said mating ball being spring-biased toward said lower hub and held in place by a threaded cap such that said ball engages said detent with sufficient force from said spring to hold said upper and lower hubs together during normal field operation of the disc cutterbar. 4. The disc cutterbar of claim 3 wherein: said shear mechanism comprises a plurality of said ball and detent mechanisms equally spaced radially about the bore through said upper hub. 5. The disc cutterbar of claim 4 wherein: said upper and lower hubs are disc-shaped, and said at least one knife comprises two opposing knives pivotally affixed to said disc member. 6. The disc cutterbar of claim 5 wherein: the springs in said plurality of ball and detent mechanisms generally all exert the said compression force on the respective balls. 7. The disc cutterbar of claim 5 wherein: the springs in said plurality of ball and detent mechanisms do not all exert the said compression force on the respective balls. 8. The disc cutterbar of claim 2 further including: a plurality of cutterheads are affixed to said support member generally in spaced relationship to each other, and said power transfer mechanism transfers power to each said cutterhead. 9. In a disc cutterbar having a support member with a cutterhead affixed thereto, said cutterhead having a lower end adjacent the ground when in operation and an opposing upper end, the improvement comprising: a power transfer mechanism supported by said support member and including a vertical drive shaft within said cutterhead and adapted to transfer power from a power source into rotational movement in a first direction of said vertical drive shaft, said vertical drive shaft having an upw
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