Child Protector Bush Retention Mechanism
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Solution Overview
Problem
The existing child protector mechanism for vehicle door locks faces challenges in assembly ease due to the bush's free movement relative to the child protector lever, leading to inaccurate actuation stroke transmission and increased dimensional accuracy requirements, which complicates assembly and productivity.
Innovation Solution
A child protector mechanism with a position retaining means between the first lever and the bush, allowing the bush to be retained at predetermined positions, reducing assembly complexity and eliminating the need for precise positioning during assembly, and enabling stable actuation stroke transmission without affecting the dimensional accuracy of other components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the bush is allowed to move freely with respect to the child protector lever during assembly, then the assembly process becomes complex and time-consuming, but the positioning accuracy of the bush is improved
Solution Approach 1:
The position retaining means is pre-configured on the base member to automatically retain the bush at predetermined positions (unset position and set position) during assembly. This preliminary positioning structure eliminates the need for workers to manually position and retain the bush, thereby improving assembly efficiency while ensuring accurate positioning.
2Reliability
If the bush position is determined via the child protector lever, then the actuation stroke transmission becomes inaccurate due to bush movement, but the structural complexity is reduced
Solution Approach 1:
The position retaining means acts as an intermediary between the bush and the child protector lever, providing stable positional retention for the bush. This intermediary structure prevents the bush from moving relative to the first lever, ensuring accurate actuation stroke transmission without requiring complex dimensional control of the child protector lever.
3Productivity
If the bush is retained at predetermined positions during assembly, then the assembly ease is improved and productivity increases, but the mechanism complexity increases due to the position retaining means
Solution Approach 1:
The position retaining means is integrated into the base member structure, merging the positioning function with the existing base member. This integration approach adds minimal structural complexity while providing the desired bush retention functionality, thereby improving assembly efficiency without significantly increasing overall mechanism complexity.
Data Source
Figure 1
Figure 2~3
Figure 4(a)~4(c)
AI summary
A child protector mechanism includes a base member, a first lever, a second lever, a bush arranged between the first lever and the second lever, a child protector lever for moving the bush to an unset position or a set position, and a position retaining means provided between the first lever and the bush. The bush is retained at each of the unset position and the set position by the position retaining means provided between the first lever and the bush. Therefore, when assembling the bush and the first lever to the base member, the bush is retained at a predetermined position (for example, unset position) with respect to the first lever so that the bush does not move. Thus, the easiness of assembly of the bush and the first lever and the easiness of assembly of the child protector lever are excellent.