Oil Pump Support Layout in Power Transmission Cases
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Solution Overview
Problem
Existing power transmission devices with both mechanical and electric oil pumps face challenges in enhancing support stability while minimizing the increase in size due to the need for thicker wall sections to accommodate both pumps, leading to increased axial dimensions.
Innovation Solution
The power transmission device is designed with a case that houses a power transmission mechanism and control valve, featuring a first support wall for the mechanical oil pump, a second support wall for the control valve, and a third support wall extending along the axis of rotation, with the mechanical oil pump mounted on the first support wall and the electric oil pump on the third support wall, allowing for enhanced stability without increasing the device's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the mechanical oil pump and electric oil pump are mounted on the same wall section to share the strainer, then the device complexity is reduced, but the wall section thickness must be increased to suppress vibrations, causing the axial dimension to increase
Solution Approach 1:
The patent transitions from mounting both pumps on the same wall section (2D plane arrangement) to distributing them across different wall sections (3D spatial arrangement). Specifically, the mechanical oil pump is mounted on a first wall section while the electric oil pump is mounted on a second wall section, allowing both pumps to share the strainer without requiring increased thickness of a single wall section, thus suppressing vibrations while maintaining compact axial dimensions.
2Stability of the object's composition
If the wall section thickness is increased to enhance support stability of both pumps, then the vibration suppression is improved, but the axial dimension of the drive device increases
Solution Approach 1:
The patent divides the support structure into multiple separate wall sections instead of using a single thick wall section. The mechanical oil pump is supported by a first wall section while the electric oil pump is supported by a second wall section. This segmentation allows each wall section to be optimized for its specific pump's vibration suppression needs without requiring the entire structure to be thicker, thereby maintaining compact axial dimensions while providing adequate support stability for both pumps.
Data Source
AI summary
A power transmission device includes a case that houses a power transmission mechanism, a control valve arranged upright inside the case, and first and second pumps configured to supply oil to the control valve. The case has a first support wall that supports an axis of rotation of the power transmission mechanism, a second support wall that supports the control valve and is arranged aligned with the axis of rotation, a first chamber located on one side of the first support wall, a second chamber adjacent to the first chamber across the second support wall, and a third support wall extending from the second support wall along the axis of rotation to the other side of the first support wall. The first pump is mounted on the first support wall inside the first chamber. The second pump is mounted on the third support wall inside the second chamber.