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    Vacuum pumping device
    31.
    发明授权
    Vacuum pumping device 失效
    真空泵装置

    公开(公告)号：US3703077A

    公开(公告)日：1972-11-21

    申请号：US3703077D

    申请日：1970-11-23

    Applicant: BENDIX CORP

    Inventor： CRIPE MAXWELL L

    IPC: B60T13/22 ,  B60T13/52 ,  B60T17/22 ,  F03B ,  F01L31/02 ,  F16D65/24

    CPC classification number: B60T13/52 ,  B60T13/22 ,  B60T17/22

    Abstract: A power braking system having a vacuum operated pumping device for supplying fluid under pressure to operate a spring braking device. The pumping device has a housing with an internal cavity divided by a wall member. Vacuum is maintained on one side of the wall member while vacuum and atmospheric pressure are alternately communicated to the other side. This alternate communication will create a pressure differential across the wall member causing the wall member to reciprocate in the cavity. A cylinder having an inlet connected to a reservoir and an outlet operatively connected to the spring braking device contains a piston attached to the wall member. As the wall member reciprocates, the piston will pressurize the fluid transmitted to the outlet. A check valve located in the conduit leading from the outlet will prevent any backflow pressure while permitting the pumping device to raise the pressure in an accumulator to a predetermined value. When this predetermined pressure in the accumulator is equal to the force required to move the piston, alternate communication of vacuum and atmospheric pressure to the rear will automatically cease. An inversion valve has an inlet connected to the accumulator for communicating fluid under pressure through a control port to operate the spring brake device. Upon actuation of the inversion valve by an operator, fluid flow through the inlet is inhibited and the pressurized fluid allowed to escape to the reservoir to thereby permit the spring brakes to be applied. A pressure indicator located in the conduit between the check valve and the inversion valve will transmit a signal to an indicator to alert the operator if a low pressure condition is present in this braking system.

    Abstract translation: 一种动力制动系统，其具有用于在压力下供应流体以操作弹簧制动装置的真空操作泵送装置。 泵送装置具有壳体，其具有由壁构件分隔的内部空腔。 真空保持在壁构件的一侧，同时真空和大气压交替地传送到另一侧。 这种交替的通信将在壁构件之间产生压差，导致壁构件在空腔中往复运动。 具有连接到储存器的入口和可操作地连接到弹簧制动装置的出口的圆筒包含附接到壁构件的活塞。 当壁件往复运动时，活塞将对传递到出口的流体加压。 位于从出口导出的导管中的止回阀将防止任何回流压力，同时允许泵送装置将蓄能器中的压力升高到预定值。 当蓄能器中的这个预定压力等于移动活塞所需的力时，真空和大气压力的交替连通将自动停止。 反向阀具有连接到蓄能器的入口，用于在压力下通过控制端口连通流体以操作弹簧制动装置。 在由操作者致动反转阀时，通过入口的流体流动被阻止并且加压流体允许逃逸到储存器，从而允许施加弹簧制动器。 位于止回阀和反转阀之间的管道中的压力指示器将向指示器传送信号，以向操作者通知该制动系统中是否存在低压状况。

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