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公开(公告)号：US5380073A
公开(公告)日：1995-01-10
申请号：US125068
申请日：1993-09-21
CPC分类号： B60T15/045
摘要： A dual circuit brake valve system comprises first and second brake circuits, first and second combined inlet and outlet valves through which first and second braking pressures respectively are delivered to said first and second brake circuits, and first and second pistons which actuate the first and second combined inlet and outlet valves respectively. The second piston is actuated by the first braking pressure which serves as a control pressure therefor. To achieve simultaneous actuation of the first and second combined inlet and outlet valves, a compression spring is installed between the first and second pistons and mechanically connects these to each other. Thereby, a pressure difference of .DELTA.p between the pressure in the first brake circuit and the pressure in the second brake circuit, which approaches zero, is achieved. In order to be able to increase the pressure difference .DELTA.p in the two brake circuits, a third piston is provided between the first and second pistons. The third piston is subjected to braking pressure from the first brake circuit in such a manner that the third piston compresses the compression spring when a predetermined level of pressure is reached in the first brake circuit, thereby causing the mechanical connection between the first piston and the second piston to be suspended.
摘要翻译： 双回路制动阀系统包括第一和第二制动回路，第一和第二组合入口和出口阀，第一和第二组合的入口和出口阀分别通过第一和第二组合入口和出口阀将第一和第二制动压力输送到所述第一和第二制动回路;以及第一和第二活塞， 组合进出口阀门。 第二活塞由作为其控制压力的第一制动压力致动。 为了实现第一和第二组合入口和出口阀的同时致动，压缩弹簧安装在第一和第二活塞之间并将它们机械连接起来。 由此，实现了第一制动回路中的压力与第二制动回路中的压力之间的ΔTA的压力差接近零。 为了能够增加两个制动回路中的压差ΔTAp，在第一和第二活塞之间设置有第三活塞。 第三活塞经受来自第一制动回路的制动压力，使得当在第一制动回路中达到预定水平的压力时，第三活塞压缩压缩弹簧，从而使第一活塞与第一活塞之间的机械连接 第二活塞被悬吊。
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公开(公告)号：US4493510A
公开(公告)日：1985-01-15
申请号：US495901
申请日：1983-05-18
CPC分类号： B60T15/20 , Y10T137/86919
摘要： This invention relates to a brake pressure control valve and, more particularly, to a tractor-trailer control valve which includes a differential pressure surface relay piston that on one hand is acted upon by the control pressure from a control chamber and on the other hand by modulated pressure from a working chamber. The brake pressure control valve includes a first combination inlet and outlet valve which works together with the relay piston whereby the working chamber can be pressurized and vented via the first inlet and outlet valves. An auxiliary control chamber which is defined by the differential surfaces of the relay piston is connectable either to the working chamber or to the control chamber via second inlet and outlet valves. The pressure control surface of the relay piston is located opposite the working surface that is acted upon by control pressure in the control chamber. The pressure control surface can be enlarged by the pressure surface of the auxiliary control chamber. Thus, it is possible to modulate a pressure with an initial relatively sharp rise which is followed by a less gradual increase. In order to have a substantially equal characteristic curve during brake pressure decrease as well as during brake pressure buildup, and in order to reduce the hysteresis of the brake pressure control valve, the auxiliary control chamber is no longer vented into the working chamber but is directly vented to the atmosphere. The fluid pressure supply of the inlet valve is separated from the fluid pressure exhaust of the outlet valve of the second combination inlet and outlet valve.
摘要翻译： 本发明涉及一种制动压力控制阀，更具体地说，涉及一种拖拉机 - 拖车控制阀，其包括压差表面继电器活塞，其一方面受控制室的控制压力的作用，另一方面由 来自工作室的调制压力。 制动压力控制阀包括与继电器活塞一起工作的第一组合入口和出口阀，由此工作室可以经由第一入口和出口阀被加压和排放。 由继电器活塞的差动表面限定的辅助控制室可通过第二入口和出口阀连接到工作室或控制室。 继电器活塞的压力控制表面位于与控制室中的控制压力作用的工作表面相对的位置。 压力控制面可以通过辅助控制室的压力表面扩大。 因此，可以用初始相对较高的上升来调节压力，随后是较小的逐渐增加。 为了在制动压力降低以及制动压力累积期间具有基本上相等的特性曲线，为了减小制动压力控制阀的滞后，辅助控制室不再被排放到工作室中，而是直接 通向大气。 入口阀的流体压力供应与第二组合入口和出口阀的出口阀的流体压力排放分离。
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