Claw Transmission Switching with Rotation-Position Sensing
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Solution Overview
Problem
Existing switching devices for motor vehicle transmissions with unsynchronized claw switching elements face challenges in efficiently transitioning between uncoupled and coupled positions without causing wear or unwanted noises due to rotational speed differences and tooth-to-tooth positions.
Innovation Solution
Incorporating an electric or electronic detection device to detect rotation positions and an electronic computing device to control the switching parts' movement, allowing for precise alignment and engagement without friction synchronization, thus avoiding tooth-to-tooth positions and associated issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If friction-fit pre-synchronization is used to synchronize claw switching elements, then rotational speed difference between switching parts is reduced, but increased wear and unwanted noises (rattling) occur due to tooth-to-tooth position
Solution Approach 1:
The patent replaces the mechanical friction-fit pre-synchronization system with an electronic control system. The electronic computing device calculates the optimal switching moment based on rotational speed and position data, and the switching device executes engagement at the precisely calculated timing, eliminating the need for mechanical friction synchronization and its associated wear and noise problems
Solution Approach 2:
The patent implements a feedback control system where rotational speed and position of the switching parts are continuously monitored, the data is fed to the electronic computing device which calculates the optimal engagement timing, and the switching device executes engagement based on this feedback information, achieving synchronization without tooth-to-tooth collision
2Device complexity
If unsynchronized claw switching elements are used without pre-synchronization, then device complexity and manufacturing cost are reduced, but rotational speed differences cause improper engagement and tooth-to-tooth positions
Solution Approach 1:
The patent replaces complex mechanical pre-synchronization mechanisms with an electronic control system that calculates and executes engagement timing based on real-time rotational data, achieving precise alignment without mechanical synchronization components
Solution Approach 2:
The patent makes the engagement timing dynamic by continuously monitoring rotational speed and position and calculating the optimal engagement moment in real-time, allowing the switching device to adapt to varying operating conditions and achieve precise engagement without fixed mechanical synchronization
3Ease of operation
If friction-fit pre-synchronization is implemented, then switching parts can be engaged, but space requirements and manufacturing costs increase
Solution Approach 1:
The patent replaces space-consuming mechanical pre-synchronization mechanisms with a compact electronic control system consisting of sensors, computing device, and switching actuator, significantly reducing the space required for the transmission system while maintaining ease of operation
Solution Approach 2:
The patent extracts the synchronization function from the mechanical transmission components and relocates it to an electronic control system, separating the synchronization function from the physical engagement mechanism and reducing the space required in the transmission housing
Data Source
AI summary
A switching device for a transmission of a motor vehicle includes an unsynchronized claw switching element that has a first switching part and a second switching part which are rotatable relative to each other around an axis of rotation. The first switching part has a first switching gearing and the second switching part has a second switching gearing which are displaceable relative to each other along the axis of rotation between a coupled position and an uncoupled position. Rotation positions in which the first and second switching parts are rotated relative to each other are detectable by a detection device. An electronic computing device moves the first and second switching parts from the uncoupled position into the coupled position depending on detected rotation positions. The detection device has a sensor element and a transmitter element, with transmitter segments, fixedly connected to the second switching part.