Disconnecting electric drive unit
An electric drive unit having a disconnecting differential a multi-phase electric motor and an inverter that controls power to the electric motor. The inverter has an inverter mount, a plurality of power semiconductors that are mounted to the inverter mount, and a plurality of busbars. Each of the busbars has first and second busbar portions, each having a body and a plurality of fingers. The fingers on the first and second busbar portions are mechanically and electrically coupled to opposite sides of terminals on corresponding ones of the power semiconductors.
1 . An electric drive unit comprising:
a housing;
an electric motor received in the housing, the electric motor having a motor output shaft;
a transmission received in the housing, the transmission including a transmission input gear, which is coupled to the motor output shaft for rotation therewith, and a transmission output gear that is rotatable about an output axis;
a differential assembly received in the housing, the differential assembly including a differential case, a differential gearset, and first and second differential output members, the differential case being coupled to the transmission output gear for rotation therewith about the output axis, the differential case defining an annular shoulder through which a plurality of circumferentially spaced-apart apertures are formed, the differential gearset having a plurality of differential pinions, which are coupled to the differential case for rotation therewith, and first and second side gears that are drivingly engaged with the differential pinions and being rotatable about the output axis relative to the differential case, the first differential output member being coupled to the first side gear for rotation therewith, the second differential output member being rotatable relative to the second side gear about the output axis, the second differential output member being movable along the output axis between a first position, in which the second differential output member is rotationally decoupled from the second side gear, and a second position in which the second differential output member is rotationally coupled to the second side gear;
a plurality of pins, each of the pins being received in an associated one of the pin apertures such that a first axial end of each of the pins abuts the second differential output member and a second, opposite axial end of each of the pins extends outwardly of the differential case from the annular shoulder;
a first axle shaft coupled for rotation with the first differential output member;
a second axle shaft coupled for rotation with the second differential output member;
an actuation flange received onto the differential case, the actuation flange having a first annular flange member that abuts the second axial ends of the pins; and
an actuator that is configured to move the actuation flange along the output axis, the actuator having an actuator fork that engages the actuation flange.
2 . The electric drive unit of claim 1 , wherein a biasing spring urges the second differential output member in a predetermined direction along the output axis.
3 . The electric drive unit of claim 2 , wherein the biasing spring biases the second differential output member toward the first position.
4 . The electric drive unit of claim 1 , wherein a first dog member is fixedly coupled to the second side gear, wherein a second dog member is fixedly coupled to the second differential output member, and wherein the first and second dog members form a dog clutch.
5 . The electric drive unit of claim 1 , wherein the actuation fork is slidably mounted on an actuation shaft that is parallel to the output axis.
6 . The electric drive unit of claim 5 , wherein the actuator further comprises a rotatable cam, wherein the cam defines a cam path that is formed about a circumference of the cam, and wherein a cam follower is mounted to the actuation fork and is received in the cam path such that rotation of the cam causes corresponding axial movement of the actuation fork.
7 . The electric drive unit of claim 6 , wherein the cam path includes a first dwell portion, a second dwell portion and a first connecting portion that extends between the first and second dwell portions, wherein the second differential output member is disposed in the first position when the cam follower is disposed in one of the first and second dwell portions, and wherein the second differential output member is disposed in the second position when the cam follower is disposed in the other one of the first and second dwell portions.
8 . The electric drive unit of claim 7 , wherein the cam path includes a second connecting portion that connects the first and second dwell portions to one another on sides of the first and second dwell portions that are opposite a side on which the first connecting portion connects the first and second dwell portions.
9 . The electric drive unit of claim 6 , wherein the actuator further comprises a rotary motor that is drivingly coupled to the cam.
10 . The electric drive unit of claim 9 , further comprising a bracket that is removably coupled to the housing, wherein the bracket supports the actuation shaft and the cam for rotation relative to the housing.
11 . The electric drive unit of claim 1 , further comprising a sleeve and a retaining ring, the sleeve being rotatable relative to the second side gear and being coupled to the second axle shaft for rotation therewith, the retaining ring being disposed between the sleeve and the second axle shaft and being configured to inhibit axial movement of the second axle shaft relative to the sleeve.
12 . The electric drive unit of claim 11 , wherein the sleeve is received into a counterbore formed in the second side gear.
13 . The electric drive unit of claim 11 , wherein a plurality of oil grooves are formed into the sleeve, the oil grooves being configured to direct lubrication on the sleeve toward an area where the sleeve contacts the second side gear.