Coupling Assembly Detent Mechanism for Precise Mode Switching
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Solution Overview
Problem
Existing motor vehicle drive trains with coupling assemblies, such as dual-clutch transmissions, face challenges in efficiently controlling and switching between different operational modes due to limitations in current selectable one-way clutches, which can lead to overshot engagements and inefficient power transmission.
Innovation Solution
A coupling assembly with a first and second selectable one-way clutch mechanism, actuated by a three-position linear actuation mechanism and secured by a detent assembly, allowing for precise control between locked and unlocked states, reducing overshot and enhancing mode selection in vehicle transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional selectable one-way clutch is used for mode switching, then the coupling assembly can change operational modes, but overshot engagements occur leading to imprecise positioning and reduced reliability
Solution Approach 1:
A detent mechanism acts as an intermediary component between the carriage and the coupling mechanisms. The detent mechanism includes a detent ball that engages with detent grooves to precisely position the carriage in locked or unlocked states, preventing overshot engagements and ensuring reliable mode switching without requiring high manufacturing precision in the coupling mechanisms themselves
Solution Approach 2:
The patent replaces purely electromagnetic actuation with a hybrid system that incorporates a mechanical detent mechanism. The electromagnetic actuator moves the carriage, but the mechanical detent grooves and ball provide the final positioning and locking, substituting the need for highly precise electromagnetic control with a robust mechanical positioning system
2Ease of operation
If electromagnetic actuation is used for coupling mechanisms, then remote control is enabled, but overshot engagements occur due to lack of precise mechanical stopping
Solution Approach 1:
The detent mechanism serves as a mechanical intermediary that receives the motion from the electromagnetic actuator and converts it into precise, discrete positions. The detent ball engages with grooves at specific locations, ensuring the carriage stops exactly at the intended position regardless of the electromagnetic actuator's control precision
Solution Approach 2:
The detent grooves are designed with curved surfaces that gradually guide the detent ball into the grooves as the carriage approaches the locked position. This gradual engagement acts as a cushion, preventing sudden impacts and overshot engagements by smoothly decelerating the carriage before full engagement
3Adaptability or versatility
If a three-position linear actuation mechanism is used, then mode selection is enabled, but without a detent mechanism the carriage cannot be held in predetermined positions
Solution Approach 1:
The detent mechanism acts as a mediator that holds the carriage in predetermined positions (first, second, and third positions) corresponding to different operational modes. The detent ball engages with detent grooves at each position, providing stable mechanical retention without requiring continuous electromagnetic actuation
Solution Approach 2:
The detent mechanism is designed to automatically engage and hold the carriage in the correct position based on the actuator's movement. Once the actuator moves the carriage to a predetermined position, the detent ball automatically engages with the corresponding groove, providing self-servicing position holding without additional control systems
Data Source
AI summary
A coupling assembly includes a multiple-position actuation mechanism and a detent assembly holding the actuation mechanism in a discrete position. The detent assembly may include a mechanical detent. In one example, the mechanical detent engages the actuation mechanism and holds the actuation member in a neutral or middle position.