Automatic Transmission Parking Lock Reset Mechanism
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Solution Overview
Problem
Existing automatic transmission shifting mechanisms with an autoP function face challenges in noise-free resetting of the gearshift lever to the parking position, as the locking pin engagement requires overcoming locking moments, leading to increased torque and potential noise during decoupling.
Innovation Solution
The introduction of a reset ring with a switching cam and catch mechanism allows for decoupling of the locking pin from the locking mechanism, enabling noise-free resetting by moving the locking pin from a first to a second position, reducing the torque required for resetting and eliminating locking moments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the locking pin remains engaged with the locking mechanism during resetting, then the parking lock function is maintained, but locking noise occurs and resetting torque increases
Solution Approach 1:
The resetting process is divided into two distinct phases: first, the locking pin is decoupled from the locking mechanism while maintaining parking lock engagement; second, the gearshift lever is reset without the locking pin interference. This segmentation eliminates the conflict between maintaining lock function and reducing noise/torque during resetting.
Solution Approach 2:
The locking pin is decoupled from the locking mechanism before the resetting operation begins. This preliminary action prevents the locking pin from interfering with the reset movement, thereby eliminating locking noise and reducing the torque required for resetting, while the parking lock remains engaged.
2Force
If the locking pin is decoupled from the locking mechanism during resetting, then resetting torque is reduced and noise is eliminated, but the parking lock function may be compromised
Solution Approach 1:
The system separates the locking pin function from the parking lock engagement function. The locking pin is decoupled for resetting operations while the parking lock remains independently engaged, ensuring both reliable parking lock function and easy resetting with reduced torque.
Solution Approach 2:
The control unit acts as an intermediary that coordinates the timing of locking pin decoupling with the resetting operation. It ensures the locking pin is decoupled at the appropriate moment before resetting begins, while maintaining parking lock engagement, thus preserving reliability while reducing resetting torque.
3Object-affected harmful factors
If a reset ring with switching cam and catch mechanism is added, then noise-free resetting is achieved, but device complexity increases
Solution Approach 1:
The switching cam and catch mechanism are integrated into the existing reset ring structure. The switching cam is formed on the reset ring, and the catch mechanism is combined with the locking pin assembly, creating a compact unified structure that achieves noise-free resetting without significantly increasing overall device complexity.
Solution Approach 2:
The reset ring serves multiple functions: it provides the switching cam for locking pin decoupling, the catch mechanism for controlled engagement, and maintains the existing resetting function. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity while achieving noise-free resetting.
Data Source
AI summary
A device for shifting an operation element of an automatic transmission of a vehicle in a parking position includes a rotationally mounted locking comb directly coupled with the operation element, with a stop member, a locking pin which is designed in a first position to fix the locking comb and in a second position to release the locking comb for a rotational movement, and a rotationally mounted set collar with a switching cam and a catch, wherein the switching cam is formed at a rotational movement of the set collar to move the locking pin from the first position to the second position, and the catch is formed at the rotational movement of the set collar to entrain the stop member to turn the locking comb so far that the operation element is shifted to the parking position.