Gearbox Control Lever Locking for Precise Shift Synchronization
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Solution Overview
Problem
Existing systems for immobilizing control levers in gearboxes lack a reliable method for provisional immobilization at a selected ratio, leading to potential misalignment and synchronization issues between the control lever and the gear change lever.
Innovation Solution
A provisional immobilization part is designed to temporarily fix the control lever at a selected ratio, comprising a positioning and locking frame with a locking boss, a maneuvering handle, and an immobilization arm, all made from a monobloc plastic material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the control lever is manipulated before connecting it to the gearshift lever, then the control lever can be positioned at a selected gear, but the control lever may move to an undesired gear when connecting it to the gearshift lever
Solution Approach 1:
The patent applies preliminary action by providing a temporary immobilizing part that pre-positions the control lever at the desired gear ratio before connection to the gearshift lever. The control lever is immobilized in advance at the correct position, preventing any unintended movement during the connection process, thus ensuring synchronization reliability.
Solution Approach 2:
The temporary immobilizing part acts as an intermediary device between the control lever and the gearshift lever connection process. It provides a stable reference position for the control lever during assembly, mediating the positioning requirement and preventing misalignment when the control cables or rods are connected.
2Reliability
If a plastic part is used to immobilize the gear lever, then the immobilization function is achieved, but the structure becomes relatively complex
Solution Approach 1:
The patent merges multiple functions into a single temporary immobilizing part that combines the positioning feature, the immobilization mechanism, and the lever connection interface. By integrating these functions into one component rather than using separate parts, the structure is simplified while maintaining reliable immobilization of the control lever at the selected gear ratio.
3Productivity
If the control lever is connected by control cables or rods to the gear change lever, then the gear selection is transmitted, but synchronization adjustment becomes difficult
Solution Approach 1:
The temporary immobilizing part enables preliminary positioning of the control lever at the exact desired gear ratio before the control cables or rods are connected. This pre-positioning eliminates the need for difficult synchronization adjustments after connection, as the control lever is already correctly aligned with the gear change lever positions.
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 immobilization part ensures precise positioning of the control lever at the desired gear ratio, preventing synchronization errors and simplifying the assembly process by eliminating the risk of incorrect lever alignment.
Implementation Method 1
the branch with locking boss being able to be elastically separated from the other branch
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a motor vehicle gearbox equipped with a component that temporarily immobilises the gearshift lever of this box. According to the invention, the gearbox (1) comprises an immobilising component (4) comprising at least one positioning and locking part (7) for positioning and locking the immobilising component (4) on a lug (8) secured to the casing (3) of the gearbox (1) and an immobilising part (6) for immobilising the gearshift lever (2) of the gearbox in a selected gear, which part (6) comprises an arm (15), of which the free end (17) is configured to immobilise the gearshift lever (2) in the selected gear of the gearbox (1). The invention is suitable for use in the automotive industry.