Vehicle Drive Parking Assembly Layout for Shorter Front-Rear Packaging
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Solution Overview
Problem
The vehicle drive device described in Patent Literature 1 cannot be smaller in the front-rear direction due to the alignment of the first and second power transmissions perpendicular to the rotary electric machine, which occupies a significant space.
Innovation Solution
The reservoir and second power transmission are located above the first power transmission, with the parking gear coaxial with the rotary electric machine, allowing the areas of these components to overlap in the front-rear direction, thus reducing the overall size of the device in this direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the first power transmission and second power transmission are aligned perpendicular to the rotary electric machine, then the power transmission paths are clear and functional, but the device size in the front-rear direction becomes large
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement where the first and second power transmissions are aligned perpendicular to the rotary electric machine to a three-dimensional stacked arrangement. The second power transmission is positioned above the first power transmission in the vertical direction, allowing both transmissions to coexist without increasing the front-rear dimension. This dimensional change enables compact packaging while maintaining clear power transmission paths and functional integrity.
2Reliability
If the reservoir is positioned to store sufficient oil for the first power transmission, then lubrication reliability is ensured, but the device occupies more space
Solution Approach 1:
The reservoir is nested within the case structure, utilizing the vertical space above the first power transmission. The reservoir is positioned to overlap with the first power transmission in the vertical direction, allowing it to store sufficient lubricating oil without increasing the overall device volume. This nested arrangement ensures reliable lubrication while maintaining compact dimensions.
3Reliability
If the parking assembly components are arranged to ensure proper engagement, then parking reliability is achieved, but the device size increases
Solution Approach 1:
The parking assembly components, including the engagement member and second power transmission, are arranged in the vertical direction above the first power transmission rather than extending in the front-rear direction. This vertical stacking maintains proper engagement reliability by ensuring the engagement member can selectively engage the parking gear while minimizing the device's front-rear footprint.
Data Source
AI summary
A parking assembly includes a parking gear in a rotary member included in the first power transmission that transmits power between a rotary electric machine and wheels and movable with the wheels, an engagement member selectively engageable with the parking gear, and a second power transmission that transmits power to the engagement member. The parking gear is coaxial with the rotary electric machine. A reservoir and the second power transmission are located above the first power transmission. An area of the reservoir in a front-rear direction, an area of the first power transmission in the front-rear direction, and an area of the second power transmission in the front-rear direction overlap an area of the rotary electric machine in the front-rear direction.