Allison Transmission, Inc.

A drive system for a hybrid or electric vehicle that includes a transmission with four forward and four reverse gears. The transmission optionally includes a first and a second planetary gearset, and optionally a first and second range selector assembly. The range selector assemblies may include a clutch and a brake, and/or a synchronizer. The drive system may include a single electric motor with any example of a transmission of the present disclosure, or multiple electric motors individually driving separate transmissions. The motors may be arranged upstream or downstream of portions of a transmission, and they may be aligned parallel with or perpendicular to a drive axle, input shaft, output shaft, and any suitable combination thereof. An internal combustion engine may be included as well.

A system and method for determining an internal state of a battery that synchronizes the overall available charge and discharge power with the present charge and discharge current limits. The system may be operable to determine a current limit for the battery according to an internal state of the battery, a voltage based current limit, and a merged current limit. The system may also be configured to determine an expected voltage based on the current limit, and to optionally determine an overall available power output based on the current limit and the expected voltage.

A multi-speed transmission including a plurality of planetary gearsets and a plurality of selective couplers is coupled to a prime mover through an input coupler. The input coupler may be a mechanical clutch useful modulate a power extraction from the prime mover, where in some forms the prime mover is a constant speed engine. The input coupler is configured to receive hydraulic fluid from the multi-speed transmission to aid in modulating power extraction from the prime mover. The hydraulic fluid is used to move an apply piston of the input coupler, where the apply piston is coupled to and applies pressure to a disk pack of the mechanical clutch. Varying pressure applied from the apply piston to the disk pack aids in modulating power extraction from the constant speed engine. The input coupler may include a balance cavity to aid in offsetting rotation induced pressure rise in a hydraulic fluid.

A drive system for a vehicle that includes a transmission with three forward and three reverse gears. The transmission is optionally coupled to an electric motor as part of a fully electric or hybrid drive system. The transmission optionally includes a first and a second planetary gearset, a first and a second brake, and a clutch which may be separated into individual drive modules, optionally in separate detachable housings. A single electric motor may be provided with a single transmission, or multiple electric motors may be included to individually drive multiple separate tires, tracks, or other earth engaging elements. Single or multiple motors may be arranged upstream or downstream of the transmission, and they may be aligned parallel with or perpendicular to a drive axle.

A multi-speed transmission including a plurality of planetary gearsets and a plurality of selective couplers is disclosed. The multi-speed transmission may include a retarder including a retarder housing, a rotor positioned in the retarder housing and fixedly coupled to a portion of the plurality of planetary gearsets, and a stator positioned in the retarder housing and fixedly coupled to at least one stationary member.

Vehicles, transmissions for vehicles, and methods of operating transmissions are envisioned. A vehicle includes a chassis, a plurality of wheels coupled to the chassis, and a transmission mounted to the chassis. The transmission includes at least one torque-transmitting mechanism selectively engageable in response to one or more fluids pressures applied thereto, a first pump to selectively deliver fluid pressure to the at least one torque-transmitting mechanism at a first pressure, a second pump to selectively deliver fluid pressure to the at least one torque-transmitting mechanism at a second pressure greater than the first pressure, and an electro-hydraulic control system to control delivery of fluid pressure from the first and second pumps to the at least one torque-transmitting mechanism in a plurality of operating modes of the transmission.

A damper for a wire harness having a plurality of wires is provided. The plurality of wires may extend beyond a first end of a sheath and be coupled to a header. The damper may comprise a body having a first end and a second end and an interior channel extending from the first end to the second end. The first end being sized and shaped to receive a portion of the header and the second end being sized and shaped to receive a portion of the sheath. The interior channel may be tapered between the first end and the second end. The damper may further comprise a plurality of spaced apart vibration fins extending from the body between the first end and the second end. The header may be part of a resolver assembly which may further include a stator, a housing having a first portion sized and shaped to receive the stator and a second portion having a channel connecting the first portion with a first end of the housing. The damper may be positioned in the second portion of the housing.

A spindle assembly of an axle assembly includes an elongate body partially forming a first cavity and a second cavity. A seal is coupled to the elongate body at a location between the first cavity and the second cavity, and the seal is configured to be in contact with an axle shaft to fluidly seal the first and second cavities from one another. A breather is coupled to the elongate body and disposed in fluid communication with the second cavity. A sleeve is also coupled to the elongate body. The sleeve includes a notch that forms at least a portion of a drainage passage through which a fluid in the second cavity may flow from an upper portion of the second cavity to a lower portion thereof.

A multi-speed transmission including a plurality of planetary gearsets and a plurality of selective couplers is disclosed. The multi-speed transmission may include a retarder including a retarder housing, a rotor positioned in the retarder housing and fixedly coupled to a portion of the plurality of planetary gearsets, and a stator positioned in the retarder housing and fixedly coupled to at least one stationary member.

A sleeve for an axle shaft assembly, which may be found in an automotive transmission, is provided. The sleeve includes a body that defines an axis of rotation about which the body is radially symmetric, an inner surface, and an outer surface. The body includes a first set of splines, a second set of splines, and a chamfered edge. The first set of splines protrude outward from the outer surface, and the first set of splines are spaced apart about the axis of rotation. The second set of splines protrude outward from the outer surface, and are spaced apart about the axis of rotation. The first set of splines is axially spaced apart from the second set of splines, along the axis of rotation. The chamfered edge extends from a leading edge of the first set of splines toward the outer surface, between the first and second set of splines.