Sleeve Support Structure for Automatic Transmission Axis Alignment
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Solution Overview
Problem
Conventional automatic transmission designs with adjacent motor and oil pump configurations face issues of increased axial length and inaccurate axis positioning of the oil pump drive shaft, leading to unstable rotation.
Innovation Solution
A sleeve supporting structure is introduced, where a sleeve-shaped oil pump drive shaft is supported by both the oil pump housing and the rotational shaft portion, with a faucet joint mechanism to ensure accurate alignment and reduced axial length, utilizing a stationary member with a projection to form a cooperative joint with the oil pump housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the motor shaft and oil pump drive shaft are provided separately, then the motor and oil pump can be disposed adjacent to each other, but the axial length of the automatic transmission increases
Solution Approach 1:
The patent combines the motor shaft and oil pump drive shaft into a single integrated shaft structure. The motor shaft serves dual functions: driving the motor and simultaneously driving the oil pump through an integrated drive shaft portion, eliminating the need for separate drive shafts and reducing axial length while maintaining adjacent disposal capability
2Device complexity
If the oil pump drive shaft is supported by only a bushing, then the structure is simple, but the axis positioning accuracy is poor and rotation is unstable
Solution Approach 1:
The support structure is segmented into multiple functional zones: a bearing portion for precise rotational support, a faucet joint portion for accurate positioning, and a connection portion for structural integration. This segmentation allows each zone to perform its specific function optimally, achieving high positioning accuracy without excessive overall complexity
3Manufacturing precision
If a sleeve-shaped drive shaft is used, then assembly accuracy can be improved, but the axial length increases
Solution Approach 1:
The sleeve-shaped drive shaft is nested within the motor shaft structure, with the drive shaft portion fitting inside the motor shaft. This nested configuration allows the sleeve to provide precise positioning and support functions while occupying minimal axial space, avoiding the length increase that would result from a separate external sleeve structure
Data Source
AI summary
A sleeve supporting structure for an automatic transmission, including a sleeve member disposed on a radial outside of an input shaft, a rotational shaft portion disposed in a motor, an oil pump housing, and a stationary member supporting an outer circumferential surface of the rotational shaft portion and including a projection that projects toward a side of the oil pump. The sleeve member has one axial end portion overlapped with the rotational shaft portion in the radial direction thereof and an opposite axial end portion meshing with an inner gear of the oil pump, and is supported by an inner circumferential surface of the oil pump housing and an inner circumferential surface of the rotational shaft portion. The projection of the stationary member is fitted onto an outer circumferential surface of the oil pump housing so as to form a faucet joint in cooperation therewith.