Control system for a stepless hydrostatic drive
阅读：73发布：2024-01-27
专利汇可以提供Control system for a stepless hydrostatic drive专利检索，专利查询，专利分析的服务。并且A hydrostatic drive has a pump driven by a prime mover, e.g., an internal-combustion engine, and connected in a substantially closed hydraulic power circuit with a hydraulic motor connected to a load. The hydrostatic drive may be used, for example, to power a vehicle or an accessory or appliance of the vehicle. The hydrostatic pump-motor system has a control member shiftable to vary the speed of the system in a stepless manner and operated by a servocylinder from a pilot valve which, in turn, is controlled by the pressure in a pair of pilot lines. A speed governor or sensor responsive to an overload of the engine, automatically acts upon the pilot valve to reduce the speed in the vent of a torque overload.，下面是Control system for a stepless hydrostatic drive专利的具体信息内容。
1. A stepless hydraulic drive connected between a power shaft and a load shaft, comprising: a hydraulic power circuit including a hydraulic pump connected with said power shaft, a hydraulic motor in fluid communication with said pump and operatively connected with said load shaft, and a control member for varying the output speed of said hydraulic motor with respect to the speed of said power shaft; a control arrangement for said Hydraulic power circuit including a pilot valve connectable to a source of fluid pressure and having a valve member shiftable between at least two positions, a positioning cylinder connected to said pilot valve and hydraulically energizable by said source through said pilot valve and connected to said control member for shifting same, a transmitter including a control valve for applying fluid pressure to said valve, and a pilot-fluid line connected between said control valve and said pilot valve for applying pilot pressure to said valve member; a speed-responsive relief valve connected between said line and a low-pressure space and responsive to the speed of one of said shafts for relieving the pressure in said line upon a diminution of the speed of said one of said shafts; and a throttle in said line between said transmitter and the point at which said relief valve is connected to said line.
2. Stepless hydraulic drive defined in claim 1 wherein: said pump is a hydrostatic pump provided with said control member; said motor is a hydrostatic motor and said power circuit includes a pair of power-fluid lines connecting said pump and said motor in a closed system; said control member is shiftable from a neutral position in opposite directions into a pair of operating directions; said positioning cylinder is a double-acting piston connected to said member and defining in said cylinder a pair of working chambers, said pilot valve being a four-port three-position valve with a pair of ports connected respectively to said working chambers, a further port connected to said source and another port connected to a fluid reservoir, said valve member being biased into an intermediate position corresponding to said neutral position of said control member and being shiftable into a pair of extreme positions respectively corresponding to the operating positions of said control member by pilot-fluid pressure applied in opposite directions to said valve member; and said control arrangement comprises a further pilot-fluid line connected between said transmitter and said pilot valve for applying pilot pressure to said valve member in a direction opposite the pilot-fluid pressure applied through the first-mentioned pilot-fluid line.
3. The stepless hydraulic drive defined in claim 2 wherein said control arrangement includes a changeover valve having a pair of inputs respectively connected to said pilot-fluid lines and an output between said inputs connected to said relief valve, said changeover valve being so constructed and arranged that fluid is drained from one of said pilot-fluid lines upon the pressure at said output falling substantially below the pressure in said one of said lines.
4. The stepless hydraulic drive defined in claim 3, further comprising a second substantially identical hydraulic power circuit, a control arrangement and throttle connected by a respective changeover valve to said speed responsive relief valve for controlling another load.
5. The stepless hydraulic drive defined in claim 4 wherein said relief valve is provided with a valve housing, a plunger shiftable in said housing, a pair of nozzles opening into said housing and respectively connected with the outputs of said changeover valves and normally blocked by said plunger, spring means in said housing biasing said plunger into a position unblocking said nozzles, and centrifugal governor means connected with said shaft for permitting displacement of said plunger upon decrease in the speed thereof, said housing opening into said reservoir.
6. The stepless hydraulic drive defined in claim 5, further comprising adjusting means for selectively varying the force of said spring means.
7. The stepless hydraulic drive defined in claim 3 wherein the last two power hydraulic circuits and control arrangements are provided and said relief valve is connected exclusively to one of them.
8. The stepless hydraulic drive defined in claim 1 wherein said relief valve is connected to said load shaft.
9. The stepless hydraulic drive defined in claim 8 wherein the relief valve is connected to said power shaft.
10. The stepless hydraulic drive defined in claim 3 wherein said motor is provided with a further control member for varying the speed of said load shaft, said relief valve being connected to said power shaft, said control arrangement further comprising a further cylinder having a piston connected to said further control member, a further pilot valve connected between said source and said further cylinder and biased by a control fluid pressure, and a further changeover valve connected across between said pilot-fluid lines and having an output applied to said further pilot valve.
11. The stepless hydraulic drive defined in claim 10 wherein said transmitter includes: a pair of control valves each connected between said source and one of said pilot-fluid lines, said stepless hydraulic drive further comprising a further hydraulic power circuit and control arrangement substantially identical to the first-mentioned hydraulic power circuit and control arrangement for operating a further load; and a common control member for operating all of said control valves.
12. The stepless hydraulic valve defined in claim 11 wherein each of said control valves is provided with a respective one of said throttles, said source includes an auxiliary pump connected with said power shaft, said power shaft is the output shaft of an internal combustion engine, and the load shafts are connected to the driving members of a vehicle powered by said engine.
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