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2. 发明授权

US06305486B1 Hydrostatic drive and steering system for a utility vehicle 失效
标题翻译：多用途车辆的静液压驱动和转向系统
公开(公告)号：US06305486B1
公开(公告)日：2001-10-23
申请号：US09495127
申请日：2000-02-01
申请人： Keith M. Polzin , Gene A. Van Voorst
发明人： Keith M. Polzin , Gene A. Van Voorst
IPC分类号： B60K17356
CPC分类号： F16H61/4043 , B60K17/10 , B60K17/356
摘要： A hydrostatic drive for a utility vehicle includes a prime mover (engine) which drives a variable rate hydrostatic pump. In a two-wheel drive system, the hydraulic fluid flow from the pump is split evenly and directed to the rear wheel motors. This flow turns the rear wheel motors and then exits the wheel motors where it is directed back to the pump. In a four-wheel drive system the flow from the pump is split evenly between the front wheel motors. The flow exiting the front motors is directed to the rear wheel motors on the opposite sides of the vehicles. This flow turns the rear motors and then is directed back to the pump. Direction and speed of the vehicle is regulated by an operator-controlled actuator which controls the direction and displacement of the hydrostatic pump. A neutral valve is interconnected between the pump and the motors. The neutral valve is movable between a first position at which fluid flow output from the pump bypasses the motors and is redirected to the pump, and a second position at which the output flow from the pump is directed to the hydraulic motors. The neutral valve allows the pump to be disengaged from the motors so the vehicle can be easily pushed by hand. The hydrostatic drive also includes a flow control valve interconnected between the pump and the motors and being adapted to bypass fluid flow around the motors until the rate of flow from the pump reaches a predetermined level. The flow control valve operates to expand the neutral region and add to the controllability of the vehicle. The vehicle also has a hydrostatic steering system.
摘要翻译：用于多功能车的静液压驱动器包括驱动可变速率静液压泵的原动机（发动机）。在两轮驱动系统中，来自泵的液压流体流动均匀分配并引导到后轮马达。该流程转动后轮马达，然后离开车轮马达，在那里它被引导回泵。在四轮驱动系统中，来自泵的流量在前轮电动机之间被均匀分配。离开前马达的流量被引导到车辆相对两侧的后轮马达。该流程转动后电机，然后被引导回泵。车辆的方向和速度由控制静液压泵的方向和位移的操作者控制的致动器来调节。一个中性阀在泵和电动机之间互连。所述中性阀可以在第一位置和第二位置之间移动，所述第一位置在所述第一位置处从所述泵输出的流体流绕过所述马达并被重定向到所述泵，以及第二位置，所述泵的输出流在所述第二位置被引导到所述液压马达。中性阀允许泵与电动机分离，因此车辆可以方便地用手按压。静液压驱动器还包括在泵和电动机之间互连的流量控制阀，并且适于围绕电动机旁路流体流，直到来自泵的流量达到预定水平。流量控制阀操作以扩展中性区域并增加车辆的可控制性。车辆还具有静液压转向系统。

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