| CPC F16H 63/3483 (2013.01) [F15B 15/261 (2013.01)] | 18 Claims |
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1. 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, the park system including
a park assembly,
an electro-hydraulic valve assembly to deliver one or more fluid pressures, and
an actuation linkage having a piston axially translatable along a longitudinal axis in response to the one or more fluid pressures delivered thereto from the electro-hydraulic valve assembly,
wherein:
the actuation linkage is coupled between the electro-hydraulic valve assembly and the park assembly such that translation of the piston along the longitudinal axis drives operation of the park assembly through the actuation linkage in (i) an engaged state, in which the park system resists rotation of the output shaft, and (ii) a disengaged state, in which the park system permits rotation of the output shaft,
the actuation linkage includes a plate pivotally coupled to the piston such that movement of the piston along the longitudinal axis causes rotation of the plate about a rotational axis,
the actuation linkage includes a biasing element surrounding the rotational axis that applies a biasing force to the plate to urge interaction between the plate and the piston,
the biasing element is wound around a sleeve of the actuation linkage such that the biasing element is at least partially retained around the rotational axis by the sleeve, and
the sleeve is mounted on the rotational axis and configured for linear movement along the rotational axis in use of the park system.
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