Park Lock Layout for Compact Electric Vehicle Transmissions
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Solution Overview
Problem
There is a need for further miniaturization of power transmission devices for electric automobiles to accommodate mounting requirements while maintaining functionality.
Innovation Solution
The power transmission device incorporates a gear mechanism, a wall part overlapping the gear mechanism axially, a plate between the wall and gear mechanisms, and a park lock mechanism with a parking pawl and detent mechanism, allowing for compact design without increasing size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the power transmission device is miniaturized, then the mounting space is reduced, but the park lock mechanism components may interfere with each other
Solution Approach 1:
The patent applies dimensional arrangement by placing park lock mechanism components on opposite surfaces of the plate member. The parking pawl is arranged on the first surface while the manual shaft and detent mechanism are arranged on the second surface, utilizing the third dimension (axial direction) to avoid component interference while miniaturizing the overall device volume.
Solution Approach 2:
The patent implements nested arrangement by positioning the parking pawl within the holder that is attached to the plate member, and placing the detent mechanism components (detent ball, detent groove) within the manual shaft assembly. This nested configuration reduces the overall footprint and allows compact integration of multiple functions within limited space.
2Device complexity
If components are arranged on the same surface of the plate, then the structure is simpler, but the axial length increases
Solution Approach 1:
The patent transitions from two-dimensional planar arrangement to three-dimensional spatial arrangement by utilizing both surfaces of the plate member. Components are distributed across the first and second surfaces in the axial direction, reducing the axial length requirement while maintaining structural integrity and simplifying the overall design.
3Volume of moving object
If the plate member is made thinner, then the axial size is reduced, but the space for mounting components is limited
Solution Approach 1:
The patent compensates for the reduced thickness of the plate member by utilizing the third dimension - arranging components on both the first and second surfaces. This dual-surface configuration provides sufficient mounting capacity for all park lock mechanism components while maintaining a thin profile and reduced axial size.
Solution Approach 2:
The patent segments the component arrangement into two distinct groups: components on the first surface (parking pawl) and components on the second surface (manual shaft, detent mechanism). This segmentation allows efficient utilization of the limited plate thickness by distributing components across available surfaces rather than competing for the same space.
Data Source
AI summary
A power transmission device includes a gear mechanism, a wall part that overlaps with the gear mechanism in an axial direction, a plate provided between the wall part and the gear mechanism in the axial direction, and a park lock mechanism. The park lock mechanism has a parking pawl on a side of a surface of the plate facing the wall part. The park lock mechanism has a manual shaft and/or a detent mechanism on a side of a surface of the plate facing the gear mechanism.