| CPC F16H 63/3483 (2013.01) [F16H 61/0206 (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 gear assembly,
an actuator valve having a valve element axially translatable along a first longitudinal axis in response to one or more fluid pressures applied thereto,
an actuation linkage coupled between the actuator valve and the park gear assembly such that translation of the valve element along the first longitudinal axis drives operation of the park gear 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, and
a position sensor to generate a signal indicative of a position of the valve element along the first longitudinal axis in response to axial translation of the valve element along the first longitudinal axis,
wherein:
the actuation linkage includes a plate pivotally coupled to the valve element such that movement of the valve element along the first longitudinal axis causes rotation of the plate about a first rotational axis,
the plate includes a body that surrounds the first rotational axis and is formed to include a plurality of notches along an outermost edge thereof,
the plate includes a mount extension appended to the body that extends outwardly away from the body and is formed to include a slot that extends through one end thereof and is disposed between two mount arms pivotally coupled to the valve element,
the valve element of the actuator valve is formed to include a first annular groove at an outer periphery thereof and a second annular groove at the outer periphery, and
the first annular groove and the second annular groove are spaced from one another along the first longitudinal axis.
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