Bidirectional Self-Locking Device for Automobile Seat Height Adjustment
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Solution Overview
Problem
Conventional self-locking mechanisms for automobile seat height adjustment suffer from insufficient torsion moment and insecure locking, leading to uncontrolled height adjustments when a passenger sits on the seat.
Innovation Solution
A bidirectional self-locking device featuring two pairs of locking cams and elements that rotate synchronically due to spring action, engaging with the housing to prevent rotation of the central shaft, ensuring secure locking in both directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a torsion spring type brake mechanism is used for seat height adjustment, then the structure is simple, but the torsion moment received is small and locking is not secure
Solution Approach 1:
The locking mechanism is divided into two independent locking devices (first locking device with first locking cam and first locking element; second locking device with second locking cam and second locking element), each capable of providing locking force in different directions. This segmentation allows the system to achieve secure bidirectional locking while maintaining reasonable structural complexity
Solution Approach 2:
The patent combines two locking devices with different locking directions into a single integrated mechanism. The first locking cam and second locking cam work together with their respective locking elements to provide simultaneous bidirectional locking, merging the functions of multiple components into a coordinated system that enhances locking security
2Reliability
If a two-stage gear transmission mechanism is used for seat height adjustment, then the structure is complicated, but the locking security is improved
Solution Approach 1:
The locking mechanism is segmented into two distinct locking devices that operate independently but simultaneously. Each locking device has its own cam and locking element pair, allowing the system to achieve secure bidirectional locking without requiring complex multi-stage gear transmissions
Solution Approach 2:
The locking elements automatically engage with the housing inner wall through the cam rotation mechanism. When the central shaft rotates, the locking cams convert this rotation into radial outward movement of the locking elements, which automatically press against the housing to form locking engagement without requiring additional control mechanisms
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 device achieves secure locking and stable height adjustment by utilizing the synchronized rotation and radial outward movement of locking elements to prevent central shaft rotation, enhancing the locking mechanism's effectiveness compared to prior art.
Implementation Method 1
a first spring is connected to the first locking element and the fourth locking element, and a second spring is connected to the second locking element and a third locking element
Implementation Method 2
the first locking element and the second locking element tend to move radially outward and thus tightly press against an inner wall of the housing so as to form a locking engagement
Data Source
AI summary
Disclosed is a bidirectional self-locking device including a housing (10) and a gear shaft (20). A first locking device and a second locking device are disposed in the housing (10). When a first locking cam (30) is driven to rotate in a first direction, protuberances on both sides of the first locking cam (30) are respectively in contact with a first locking element (31) and a second locking element (32), such that the first locking element (31) and the second locking element (32) tend to move radially outward and thus tightly press against an inner wall of the housing (10) so as to form a locking engagement. The second locking device has a similar structure to that of the first locking device. When a second locking cam (40) is rotated in a direction opposite to the first direction, a third locking element (41) and a fourth locking element (42) press against the inner wall of the housing (10) so as to form a locking engagement. The first locking cam (30), the second locking cam (40) and the gear shaft (20) are connected through a central shaft (80). A first spring (50) and a second spring (60) cause the first locking device and the second locking device to rotate synchronically.