Park Lock Wedge Geometry to Prevent Pole Side Catching
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Solution Overview
Problem
The existing park lock mechanism is prone to the park wedge getting caught on the side surface of the park pole when transitioning from the parking lock release state to the parking lock state, preventing the mechanism from entering the correct lock position.
Innovation Solution
A park lock mechanism with a park pole featuring a protrusion that includes a third inclined surface continuous with the first inclined surface, allowing the park wedge to abut and preventing it from being caught on the side surface, ensuring proper engagement and locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cam member (park wedge) moves from the parking lock release state to the parking lock state, then the parking lock state should be achieved, but the cam member may be caught on the side surface of the pole member (park pole) and the parking lock mechanism may not be set into the parking lock state
Solution Approach 1:
The protrusion with the third inclined surface is provided in advance on the park pole before the park wedge approaches. This preliminary structural arrangement guides the park wedge onto the correct engagement path, preventing it from being caught on the side surface during the transition to the parking lock state.
Solution Approach 2:
The protrusion acts as an intermediary element between the park wedge and the main body of the park pole. The third inclined surface on the protrusion serves as a transition surface that mediates the movement of the park wedge, guiding it smoothly onto the first inclined surface without causing it to be caught on the side surface of the park pole.
2Ease of manufacture
If the park pole has a simple structure without additional protrusions, then the manufacturing cost and complexity are reduced, but the park wedge may be caught on the side surface of the park pole
Solution Approach 1:
The park pole is segmented into different functional regions: the main body and the protrusion. The protrusion is a separate structural element with its own inclined surfaces, allowing it to perform the specific function of guiding the park wedge without complicating the overall structure. This segmentation enables the protrusion to be designed independently for its guiding function while maintaining manufacturing simplicity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design ensures the park lock mechanism can be reliably set into the park lock state by preventing the park wedge from being caught, while also reducing the weight and cost of the park pole through optimized surface geometry.
Implementation Method 1
the park pole includes a protrusion protruding from a first side surface on a park wedge side in a moving direction of the park wedge, and the protrusion is formed so as to be continuous with the first inclined surface, and has a third inclined surface capable of abutting on the second inclined surface
Data Source
AI summary
A park lock mechanism configured to restrict or allow a rotation of a rotating shaft includes a park pole configured to restrict the rotation of the rotating shaft and having a first inclined surface, and a park wedge having a second inclined surface capable of abutting on the first inclined surface and configured to move the park pole to a lock position that restricts the rotation of the rotating shaft, in which the park pole includes a protrusion protruding from a first side surface on a park wedge side in a moving direction of the park wedge, and the protrusion is formed so as to be continuous with the first inclined surface, and has a third inclined surface capable of abutting on the second inclined surface.