Electric park systems, transmissions incorporating the same, and methods for transmissions
AssigneeAllison Transmission, Inc.
InventorsJames Raszkowski, Isaac Mock
Life of this patent
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Abstract
Transmissions, park systems, and methods of operating transmissions are disclosed. A transmission includes an input shaft to receive torque from a drive unit, an output shaft to transmit torque to a load, and a park system to selectively brake the output shaft. The park system includes a park actuation assembly having a park gear in direct contact with the output shaft, an actuator to supply rotational power, and an actuation linkage coupled between the actuator and the park actuation assembly.
Claims20
A transmission comprising:
- an input shaft to receive torque from a drive unit;
- an output shaft to transmit torque to a load;
- and
- a park system to selectively brake the output shaft that includes a nut translatable along a first longitudinal axis, a sleeve coupled to the nut and translatable along a second longitudinal axis, and a lever interconnecting the nut and the sleeve to coordinate movement of the nut along the first longitudinal axis with movement of the sleeve along the second longitudinal axis.
A park system to selectively brake an output shaft of a transmission, the park system comprising:
- a park actuation assembly having a park gear in direct contact with the output shaft,
- an electric actuator to supply rotational power, and
- an actuation linkage coupled between the electric actuator and the park actuation assembly including a nut translatable along a first longitudinal axis, a sleeve coupled to the nut and translatable along a second longitudinal axis, and a lever interconnecting the nut and the sleeve to coordinate movement of the nut along the first longitudinal axis with movement of the sleeve along the second longitudinal axis.
A park system to selectively brake an output shaft of a transmission, the park system comprising:
- a park actuation assembly having a park gear in direct contact with the output shaft,
- an electric actuator to supply rotational power, and
- an actuation linkage coupled between the electric actuator and the park actuation assembly including a nut translatable along a first longitudinal axis, a sleeve coupled to the nut and translatable along a second longitudinal axis, and a lever interconnecting the nut and the sleeve to coordinate movement of the nut along the first longitudinal axis with movement of the sleeve along the second longitudinal axis,
- wherein the sleeve is arranged in direct contact with a spring to bias the sleeve away from movement along the second longitudinal axis toward the park actuation assembly.
Dependencies are inferred from the claim text.