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2. 发明申请

WO2009132177A2 HYDRAULIC REVERSING FAN VALVE AND MACHINE USING SAME 审中-公开
标题翻译：液压逆向风扇阀和使用它的机器
公开(公告)号：WO2009132177A2
公开(公告)日：2009-10-29
申请号：PCT/US2009041522
申请日：2009-04-23
申请人： CATERPILLAR INC , KUIPERS BEAU D , MATE EDWARD W , STANFIELD GLENN H
发明人： KUIPERS BEAU D , MATE EDWARD W , STANFIELD GLENN H
IPC分类号： F01P7/02 , F01P5/02 , F01P5/04 , F15B11/02 , F15B11/16 , F15B21/04
CPC分类号： F15B11/0406 , B60Y2200/415 , F01P11/12 , F15B2211/3127 , F15B2211/613 , F15B2211/7058 , F15B2211/755 , F15B2211/7741 , F15B2211/85 , F16H61/4043 , F16H61/4061
摘要： A machine (10) includes a hydraulic fan system (20) for circulating cooling air through an engine compartment (12). Periodically, the fan (15) rotation direction is briefly reversed in order to dislodge any material debris that may have accumulated at the inlet (18) to the engine compartment (12). When a fan reversal event is initiated, the fan motor (24) will continue to rotate due to angular momentum even after the pump output flow has been switched from a first motor port (40) to a second motor port (41). During this continued rotation as the fan (15) decelerates to zero speed, vacuum pressure levels can arise at the first motor port (40), and a pressure spike can develop at the second motor port (41). In order to alleviate these conditions, a pressure transfer valve (36) briefly opens to facilitate fluid flow directly from the second motor port (41) to the first motor port (40) as the fan motor (24) decelerates towards zero speed before reversing direction, simultaneously alleviating vacuum and pressure spike conditions.
摘要翻译：机器（10）包括用于使冷却空气通过发动机室（12）循环的液压风扇系统（20）。周期性地，风扇（15）旋转方向被短暂地反转，以便将可能在入口（18）积聚的任何材料碎屑移走到发动机室（12）。当启动风扇反转事件时，即使在泵输出流从第一马达端口（40）切换到第二马达端口（41）之后，风扇马达（24）也将由于角动量继续旋转。在风扇（15）减速到零速度期间的持续旋转期间，在第一马达端口（40）处可能产生真空压力水平，并且在第二马达端口（41）处会产生压力尖峰。为了减轻这些条件，当风扇马达（24）在转向之前以零速度减速时，压力转换阀（36）短暂地打开以便于流体从第二马达端口（41）直接流到第一马达端口（40）方向，同时减轻真空和压力尖峰条件。

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