公开(公告)号：US20080247882A1

公开(公告)日：2008-10-09

申请号：US11695890

申请日：2007-04-03

申请人： David Earl Earhart ,  Dane L. Rodgers

发明人： David Earl Earhart ,  Dane L. Rodgers

IPC分类号： F04B49/00 ,  F01C1/00 ,  F04B49/035 ,  F03C2/00

CPC分类号： F04C2/102 ,  F04C2/3442 ,  F04C11/005 ,  F04C14/226 ,  F16H57/04

摘要： A split-pressure, dual-pump system for supplying hydraulic fluid to a multi-speed transmission is provided. The system includes a low-pressure work circuit operatively connected to a fixed displacement pump, and a high-pressure work circuit operatively connected to a variable displacement pump. The system also includes a regulator valve fluidly coupled to the variable displacement pump via a decrease circuit and an overage circuit for regulating the flow of fluid to the high-pressure work circuit. The invention consists of separating the high-pressure needs of the system into a separate work circuit from the low-pressure needs of the system, and optimizing pump design separately for each work circuit to maximize transmission efficiency and reduce parasitic losses. A method of supplying hydraulic fluid to a multi-speed transmission at variable flow and pressure is also provided.

摘要翻译： 提供了一种用于向多速变速器供应液压油的分压双泵系统。 该系统包括可操作地连接到固定排量泵的低压工作回路和可操作地连接到可变排量泵的高压工作回路。 该系统还包括调节阀，该调节阀通过减小电路流体耦合到可变排量泵，以及用于调节流体流向高压工作回路的过压回路。 本发明包括将系统的高压需求从系统的低压需求分离成单独的工作电路，并且为每个工作电路分别优化泵设计，以最大化传输效率并减少寄生损耗。 还提供了一种以可变流量和压力向多速变速器供应液压流体的方法。