Patent ID: 11946543
Assignee: NIDEC CORPORATION
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A parking mechanism comprising:
an actuator having a manual shaft extending along a first axis, the manual shaft being configured to rotate around the first axis;
a flange provided on an outer periphery of the manual shaft and extending along a radial direction of the first axis;
a cam rod including a coupling portion coupled to the flange and a rod body extending along a second axis orthogonal to the first axis, the rod body being configured to move along the second axis and along with a movement of the flange;
a coil spring attached to the rod body;
a cam attached to the rod body and configured to move along the second axis by motion of the rod body transmitting via the coil spring;
a pawl member having a meshing portion and operating with a movement of the cam; and
a parking gear having a tooth portion with which the meshing portion meshes, wherein
an imaginary perpendicular line is set from the first axis to the second axis when viewed in an axial direction of the first axis,
the coupling portion is configured to move around the first axis within a range of ±45° with respect to the perpendicular line,
Formula 1 below holds

Ts>k·Xb·R·cos θ  (Formula 1)

where, k is a spring constant of the coil spring,
Xb is a maximum compression amount of the coil spring in a movable range of the rod body,
R is a distance between the first axis and the coupling portion when viewed in the axial direction of the first axis,
θ is an angle formed by the perpendicular line and the coupling portion when viewed in the axial direction of the first axis,
k·Xb·R·cos θ is a maximum torque on the manual shaft inputable from the cam rod, and
Ts is a self-holding torque of the actuator, wherein the self-holding torque suppresses rotation of the manual shaft when receiving the maximum torque from the cam rod, and
the parking mechanism excludes a leaf spring.