Axially Movable Traction Gear for Compact Transmission
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Solution Overview
Problem
Existing traction drives in motor vehicle transmissions experience high wear due to axial offset compensation, which limits their use in transmissions with limited installation space.
Innovation Solution
The traction mechanism allows the first traction wheel to be axially movable relative to the bearing journal, eliminating the need for axial offset compensation by the traction mechanism, thereby reducing wear and enabling a compact design suitable for transmissions with limited space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the chain is used to compensate for axial offset between traction wheels, then the axial offset is compensated, but high wear occurs on the chain and the traction drive size increases
Solution Approach 1:
The first traction wheel is made axially movable relative to the bearing journal through a bearing that permits axial movement. This dynamic design allows the first traction wheel to automatically adjust its axial position to match the second traction wheel, eliminating the need for chain-based compensation and thereby preventing wear on the chain while maintaining reliable torque transmission.
2Reliability
If the chain is made long enough to compensate for axial offset, then axial offset compensation is achieved, but the traction drive cannot be used in transmissions with little installation space
Solution Approach 1:
The bearing journal is designed with a bearing that allows the first traction wheel to move axially within a certain range. This dynamic positioning capability enables the traction drive to accommodate axial misalignment without requiring a long chain, thus maintaining a compact design suitable for transmissions with limited installation space while ensuring reliable operation.
3Device complexity
If the first traction wheel is fixed relative to the bearing journal, then the structure is simple, but axial offset between traction wheels causes high wear and requires larger size
Solution Approach 1:
The bearing journal incorporates a bearing that enables axial movement of the first traction wheel while maintaining rotational support. This dynamic feature adds minimal structural complexity but dramatically improves reliability by eliminating wear on the chain through automatic axial alignment, extending the service life of the entire traction mechanism.
Data Source
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AI summary
The invention relates to a traction drive for a motor vehicle transmission, comprising a first traction gear which can be connected to a first transmission component in a rotationally fixed manner, a second traction gear which is connected to the first traction gear by means of a traction element and which can be connected to a second transmission component in a rotationally fixed manner, and a bearing journal for supporting the first traction gear. The traction drive is characterized in that the first traction gear is arranged to be axially movable relative to the bearing journal.