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公开(公告)号:US4337787A
公开(公告)日:1982-07-06
申请号:US197832
申请日:1980-03-12
CPC分类号: F16D48/04 , F16D25/14 , F16D48/02 , F16D2048/0209 , Y10T137/2524 , Y10T137/2657
摘要: For work vehicles, for example, cold weather can be a problem. Disengaging the vehicle clutch (26) aids starting by reducing engine loads during starting. Where the clutch (26) is hydraulically actuated, it can be disengaged by keeping fluid pressures below required engagement pressure when supplying other elements common to the clutch hydraulic circuit. Apparatus is provided which during starting directs fluid to, for example, pump drive bearings (20) at less than clutch engagement pressure. An input signal to the apparatus from the vehicle operator after engine start-up then builds pressure to activate the clutch (26) while continuing to supply the pump drive bearings (20) for lubrication. Upon a preselected fluid flow to the apparatus, such as at engine shutdown, the apparatus automatically returns to the condition at which available pressure levels are less than required for clutch engagement. Thus, cold starting problems are substantially eliminated by automatically providing a clutch disengaged situation in the vehicle during engine start-up.
摘要翻译: PCT No.PCT / US80 / 00270 Sec。 371日期1980年3月12日 102(e)1980年3月12日PCT PCT Fils 3月12日,PCT PCT。 公开号WO81 / 02641 1981年9月17日。对于工作车辆,例如,天气寒冷可能是一个问题。 拆卸车辆离合器(26)有助于起动时减少发动机负荷。 在离合器(26)被液压致动的情况下,当提供离合器液压回路共用的其它元件时,通过将流体压力保持在所需的接合压力以下,可将其分离。 提供了一种装置,其在启动期间以小于离合器接合压力将流体引导到例如泵驱动轴承(20)。 在发动机起动之后,来自车辆操作者的装置的输入信号随后建立压力以启动离合器(26),同时继续供应用于润滑的泵驱动轴承(20)。 当预先选定的流体流到设备时,例如在发动机关闭时,设备自动返回到可用压力水平低于离合器接合所需的压力水平的状态。 因此,通过在发动机启动期间自动提供车辆中的离合器分离情况,基本上消除了冷启动问题。