Starting Device Axial Oil Passage Overlap
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Solution Overview
Problem
The existing starting devices for automatic transmissions have an increased axial length due to the separate arrangement of radial direction oil passages, which hinders size reduction despite the need for compact designs.
Innovation Solution
The starting device incorporates overlapping axial direction oil passages for the working oil and lubricating oil passages, allowing for a more compact design by eliminating the need for separate radial direction oil passage spaces within the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate radial direction oil passages are provided for working oil and lubricating oil, then oil supply functionality is ensured, but the axial length of the device increases
Solution Approach 1:
The patent merges the working oil passage and lubricating oil passage by making them overlap in the axial direction, allowing both oil supply functions to coexist within the same axial space rather than requiring separate radial passages that would increase device length
Solution Approach 2:
The patent transitions from a planar arrangement of oil passages to a three-dimensional overlapping configuration, where passages are arranged to overlap in the axial direction, effectively utilizing vertical space to reduce the device's axial footprint while maintaining separate oil flow paths
Data Source
AI summary
A starting device includes a housing; an output side member; a clutch mechanism; a working oil passage that supplies working oil to a hydraulic chamber of the clutch mechanism from an oil pressure source side; and a lubricating oil passage including a supply oil passage that supplies lubricating oil to the housing from the oil pressure source side and a return oil passage for returning the lubricating oil to the oil pressure source side from the housing, wherein the working oil passage and the lubricating oil passage are formed to overlap at least partially in an axial direction.