Two-Gear Transmission Angular Play Control
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Solution Overview
Problem
Existing two-gear transmissions for electric machines face operational issues due to manufacturing tolerances and deformations affecting the overrunning clutch and engagement teeth play, leading to incorrect transmission operation.
Innovation Solution
A two-gear transmission design with an angular play control system and specific coupling devices, including an overrunning clutch and friction clutch, ensures proper alignment and engagement of gear components, allowing seamless torque transmission and shifting between gears without interruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manufacturing tolerances and deformations are not controlled, then the transmission may operate incorrectly, but the plays inside the overrunning clutch must be less than the plays between engagement teeth
Solution Approach 1:
A play control system is introduced as an intermediary mechanism between the overrunning clutch and engagement teeth. This system includes a control element that can be positioned in different locations to actively manage and equalize the angular plays, ensuring reliable transmission operation despite manufacturing tolerances and deformations.
Solution Approach 2:
The invention changes the parameter of angular play from a fixed manufacturing characteristic to a dynamically controllable parameter. By using the play control system to adjust and equalize plays between different components, the system maintains correct operation even when manufacturing tolerances vary.
2Reliability
If play control system is added to control angular plays, then transmission operation reliability is improved, but device complexity increases
Solution Approach 1:
The play control system acts as a targeted intermediary intervention rather than a complete system overhaul. By introducing a relatively simple control element that can be positioned strategically, the system achieves reliable operation without requiring complex structural modifications throughout the entire transmission.
Solution Approach 2:
The control system is segmented into a control element that can be independently positioned and adjusted. This modular approach allows the play control function to be added without requiring complex integration throughout the entire transmission system, thereby limiting the increase in overall device complexity.
Data Source
AI summary
Two-gear transmissions for electric machines are provided, which include a primary shaft; a secondary shaft; a first gear set which includes a first driving gearwheel and a first driven gearwheel, one of these gearwheels including a first hub and a ring gear; a second gear set which includes a second driving gearwheel and a second driven gearwheel; an overrunning clutch interposed between the ring gear and the first hub; a first coupling device arranged to connect the ring gear for rotation directly with the respective shaft and comprises a second hub and a sliding sleeve; a second coupling device arranged to connect either the second driving gearwheel or the second driven gearwheel for rotation with the respective shaft; connection elements connecting the first hub for rotation with the second hub; and elastic elements applying on the first and second hubs a biasing torque to urge them towards an end-of-travel position.