DUAL CLUTCH DRIVE MODULE WITH SINGLE SERVO HYDRAULIC PUMP AND NORMALLY-OPEN VALVE ACTUATION

摘要

A vehicle driveline component having a dual friction clutch differential assembly and a hydraulic circuit for operating the friction clutches. The hydraulic circuit includes a pair of normally open, solenoid operated valves that are selectively closed to control the fluid pressure that acts on the friction clutches. The hydraulic circuit provides a simplified and cost-effective means for providing disconnecting and/or torque vectoring capabilities to the vehicle driveline component.

主权项

1. A vehicle driveline component comprising:
a housing; an input pinion received in the housing and rotatably disposed about a first axis; a ring gear received in the housing and rotatably disposed about a second axis; a differential assembly mounted in the housing for rotation about the second axis, the differential assembly having a differential case, a first friction clutch and a second friction clutch, the differential case being coupled to the ring gear for common rotation, the first friction clutch having a first input portion, which is coupled to the differential case for common rotation, and a first output portion, the second friction clutch having a second input portion, which is coupled to the differential case for common rotation, and a second output portion; a hydraulic circuit comprising a reservoir, a first cylinder assembly, a second cylinder assembly, a first valve, a second valve, an electric motor, a pump, a first flow control device and a second flow control device, the reservoir being configured to hold a hydraulic fluid, the first cylinder assembly being configured to selectively actuate the first friction clutch and including a first piston that is received in a first chamber, the second cylinder assembly being configured to selectively actuate the second friction clutch and including a second piston that is received in a second chamber, the first valve being a solenoid operated, normally open two-way valve with a first outlet port, which is in fluid communication with the first chamber, and a first inlet port, the second valve being a solenoid operated, normally open two-way valve with a second outlet port, which is in fluid communication with the second chamber, and a second inlet port, the electric motor being selectively operable for driving the pump, the pump being configured to draw hydraulic fluid from the reservoir and provide pressurized hydraulic fluid to the first and second inlet ports, the first flow control device being in fluid communication with the first chamber and the reservoir, the second flow control device being in fluid communication with the second chamber and the reservoir.