Power take-off unit housing having integral hydraulic manifold

摘要

A power take-off unit (31) and hydraulic control system (32) includes an external manifold (33) having a plurality of internal passageways formed therein. Pressurized fluid from a source is supplied to an input port provided on the manifold (33). A solenoid valve (34) is mounted on the manifold (33) and is selectively operable in a first and second mode to control the flow of pressurized fluid therethrough to a clutch actuation port of the power take-off unit. Low pressure fluid is supplied from a low pressure port of the manifold (33) to the power take-off unit (31) so as to provide internal lubricating fluid thereto. A temperature switch (35) and a pressure switch (36) may also be mounted directly on the manifold (33). A bracket or other mechanism may be provided to mount the manifold on a support surface (37), such as on a side rail of a frame assembly for the vehicle. Alternatively, the plurality of internal passageways may be formed within a housing for the power take-off unit. Thus, the solenoid valve (34), the temperature switch (35), and the pressure switch (36) are all mounted directly on the housing of the power take-off unit (31), and no external mounting bracket or other mechanism is required.