Shift Blocking Mechanism for Accurate Gear Selection
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Solution Overview
Problem
Existing shift mechanisms face issues with gear misoperation, stress fatigue of torsion springs, and structural interference due to large sweep ranges, leading to incorrect gear shifting and reduced service life.
Innovation Solution
A blocking component with a body, slidable member, elastic member, and rotatable blocking member is integrated into a shift mechanism, allowing for precise gear shifting by applying an elastic reset force and reducing torsion spring stress through optimized torque distribution and design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If gears are arranged in sequence from top to bottom (P, R, N, D, L/M), then the shift mechanism can realize gear shifting among all gears, but shifting to the wrong gear (e.g., L/M instead of D) easily occurs
Solution Approach 1:
A blocking component is introduced as an intermediary element between the shift lever and the gear selection mechanism. This blocking component includes a blocking member that can rotate to present different surfaces (blocking surface, transition surface, abutting surface) to the shift lever, thereby mediating the gear selection process and preventing incorrect gear engagement
Solution Approach 2:
The blocking member is designed to be rotatable rather than fixed, allowing it to dynamically change its orientation and present different surfaces based on the shifting operation. This dynamic adjustment enables the blocking component to adaptively control gear selection and prevent wrong gear engagement
2Ease of operation
If a torsion spring is used to apply reset force to the blocking member, then the blocking member can return to its initial position, but the torsion spring experiences stress fatigue reducing its service life
Solution Approach 1:
The blocking component is segmented into multiple functional parts: a blocking member for gear selection, an elastic member for reset force, and a return member. This segmentation allows the elastic member to provide reset force without requiring a torsion spring, thereby eliminating stress fatigue on the torsion spring while maintaining the reset function
Solution Approach 2:
An elastic member is introduced as an intermediary to provide the reset force, replacing the direct use of a torsion spring. This intermediary element distributes the stress and eliminates the stress fatigue problem associated with torsion springs while still enabling the blocking member to return to its initial position
3Reliability
If the blocking member has a large sweep range to prevent wrong gear shifting, then gear selection accuracy improves, but structural interference occurs within the shift mechanism
Solution Approach 1:
Different surfaces of the blocking member are designed with different local qualities and functions: a blocking surface for preventing wrong gear selection, a transition surface for smooth shifting, and an abutting surface for positioning. This local differentiation allows the blocking member to achieve high gear selection accuracy with a compact design, avoiding structural interference
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution prevents incorrect gear shifting, reduces stress fatigue, and minimizes structural interference, enhancing the reliability and longevity of the shift mechanism.
Implementation Method 1
an elastic member, arranged between the body and the slidable member and configured to apply an elastic reset force to the slidable member so that the slidable member tends to move towards the outside of the body
Implementation Method 2
a torsion spring is arranged at the rotational connection point, and when the blocking component is in the natural state, a torsion applied to the blocking member by the torsion spring is 0 or slightly greater than 0
Data Source
AI summary
A blocking component includes a body, arranged fixedly, a slidable member, slidably connected to the body and movable relative to the body, an elastic member, arranged between the body and the slidable member and configured to apply an elastic reset force to the slidable member so that the slidable member tends to move towards the outside of the body and a blocking member, rotatably connected to the slidable member and having a stop surface facing away from the body, a transition surface facing the body, and an abutting surface facing the slidable member. When the blocking member is in a natural state, the abutting surface is in contact with a surface of the slidable member, and the natural state includes at least a state in which no external force away from the body is applied to the transition surface.