Vehicle Seat Fitting Unlocking Lever for Consistent Actuation
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Solution Overview
Problem
Existing seat fittings for motor vehicle seats face challenges in maintaining a consistent actuation path for unlocking the seat longitudinal guide due to the tumbling movement caused by eccentric epicyclic gearing, leading to varying bowden cable lengths and increased installation space requirements.
Innovation Solution
The seat fitting incorporates an adjustable unlocking lever on the fitting lower part, with stop surfaces designed to compensate for the tumbling movement, ensuring a consistent displacement and unlocking of the fixing device regardless of the seat's inclination, allowing for a compact design with reduced installation space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If eccentric epicyclic gearing is used to connect the fitting upper part and fitting lower part, then the seat back can be adjusted to different inclination angles, but the tumbling movement causes varying bowden cable extensions and different actuation paths for unlocking the seat longitudinal guide
Solution Approach 1:
A coupling element is introduced as an intermediary between the actuating means and the seat longitudinal guide fixing device. This coupling element translates the tumbling movement caused by the eccentric epicyclic gearing into a consistent linear displacement, ensuring uniform actuation path regardless of the seat back inclination angle.
Solution Approach 2:
The actuating means is designed to dynamically adapt to the tumbling movement of the eccentric epicyclic gearing. By making the actuating means movable relative to the fitting lower part and allowing it to follow the tumbling motion, the system maintains consistent bowden cable extension and uniform actuation path across different seat positions.
2Reliability
If the fixing device is designed to accommodate all occurring bowden cable lengths, then reliable unlocking is achieved in any actuation position, but significantly larger installation space is required
Solution Approach 1:
The coupling element changes the displacement parameter to remain substantially constant across different actuation positions. By transforming the variable bowden cable extension caused by tumbling movement into a constant linear displacement, the fixing device can be compact while maintaining reliable unlocking in all 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
This design ensures reliable unlocking of the seat longitudinal guide in any actuation position, facilitating easy entry into the rear of the vehicle while minimizing additional installation space, ensuring the seat can be pushed forward latch-free.
Implementation Method 1
an eccentric epicyclic gearing which connects the fitting upper part and fitting lower part in an articulated manner and is intended for adjusting the inclination of the fitting upper part relative to the fitting lower part
Implementation Method 2
a first stop surface on one of either the pivoting body or fitting lower part bears against a stop element on the other of the pivoting body or fitting lower part
Data Source
AI summary
A seat fitting for a motor vehicle seat, with a fitting lower part which is connectable to a seat lower part, a fitting upper part which is connectable to a seat back, an eccentric epicyclic gearing which connects the fitting upper part and fitting lower part in an articulated manner and is intended for adjusting the inclination of the fitting upper part in relation to the fitting lower part, and an actuating mechanism for coupling the seat fitting to a seat longitudinal guide. The fitting upper part has a pivoting body. The actuating mechanism is formed by an unlocking lever. The pivoting body substantially completely shifts the unlocking lever into the unlocking position irrespective of the inclination to which the fitting upper part is set.