Power Transmission Layout With Axial Park Lock Nesting
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Solution Overview
Problem
There is a desire for further miniaturization of power transmission devices when mounting in electric automobiles.
Innovation Solution
A power transmission device comprising a gear mechanism, a wall part overlapping with the gear mechanism in the axial direction, a plate, and a park lock mechanism with a parking pawl and/or detent mechanism, where the plate is positioned between the wall part and the gear mechanism to minimize space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the power transmission device uses conventional layout arrangements, then the structural integrity and functionality are maintained, but the overall size remains large
Solution Approach 1:
The plate is positioned between the wall part and the gear mechanism, creating a nested arrangement where components are layered axially. This nesting allows the parking pawl and detent mechanism to be integrated within the existing structural envelope, reducing the overall device volume without adding external complexity
Solution Approach 2:
The patent transitions from a conventional lateral arrangement of components to an axial stacking arrangement. By positioning the plate in the axial direction between the wall part and gear mechanism, the design utilizes the axial dimension more efficiently, compacting the device in radial directions while maintaining functional separation
2Volume of moving object
If components are positioned closer together to reduce size, then miniaturization is achieved, but the risk of functional interference increases
Solution Approach 1:
The plate acts as a physical separator that divides the housing into distinct regions: one for the gear mechanism and another for the parking pawl/detent mechanism. This segmentation ensures that even though components are axially close, they remain functionally independent with clear spatial boundaries preventing interference
Solution Approach 2:
The plate serves as an intermediary structure between the gear mechanism and the parking pawl assembly. It provides both structural support and functional separation, allowing the two subsystems to operate independently while being integrated within the same housing envelope
Data Source
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AI summary
[Problem] To downsize a motive power transmission device. [Solution] This motive power transmission device has: a gear mechanism; a wall part overlapping the gear mechanism in the axis direction; a plate provided between the wall part and the gear mechanism in the axis direction; and a parking lock mechanism. The parking lock mechanism has a parking pole on a surface side, of the plate, that faces the wall part. The parking lock mechanism has a manual shaft and/or a detent mechanism on a surface side, of the plate, that faces the gear mechanism.