Planetary Gear Seat Lifter for Synchronized Frame Movement
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Solution Overview
Problem
Existing seat lifters have difficulty in smoothly lifting and lowering both right and left seat frames due to inadequate mechanisms, leading to inefficient seat movement.
Innovation Solution
A seat lifter design featuring first and second links rotatably coupled to base and seat frames, respectively, with interlocking planetary gear groups and sun gears, allowing synchronized lifting and lowering of both seat frames through independent but interlocking mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If only one lifting and lowering mechanism section is used to control one seat frame, then the mechanism structure is simple, but the other seat frame cannot be adequately lifted and lowered
Solution Approach 1:
The patent combines two lifting and lowering mechanism sections into a single integrated system where the first mechanism section (with sector gear and coupling rod) and the second mechanism section (with rack and pinion) work together through a shared coupling rod. This merging allows both seat frames to be adequately controlled while maintaining structural efficiency
2Device complexity
If a single mechanism section is used to lift one seat frame, then the mechanism is simple, but synchronized movement of both seat frames cannot be achieved
Solution Approach 1:
The coupling rod serves as an intermediary element that connects both lifting and lowering mechanism sections. When one mechanism section operates, the coupling rod transmits the motion to the other mechanism section, ensuring synchronized movement of both seat frames without requiring complex control systems
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
Enables smooth and synchronized lifting and lowering of both seat frames, reducing the risk of foot collision and facilitating easier assembly and weight reduction by eliminating the need for complex internal gears, while ensuring reliable and synchronized movement.
Implementation Method 1
a first planetary gear group (40) to lift and lower the first seat frame (3a) with respect to the first base member (2a); and a second planetary gear group (140) to lift and lower the second seat frame (3b) with respect to the second base member (2b)
Implementation Method 2
The lifting and lowering mechanism section includes: a first lifting and lowering mechanism section having a first sun gear (62) and a first planetary gear group (40) to lift and lower the first seat frame (3a)
Data Source
AI summary
A seat lifter smoothly lifts and lowers right and left seat frames relative to respective base members so that a seat can be lifted and lowered smoothly. The seat lifter has first to fourth links (4a to 4d), and a coupling (6) that couples the first link (4a) and the second link (4b), and has a first sun gear (62) and a second sun gear (162). The first link (4a) has a first link body (41) that is coupled interlockably to a first planetary gear group (40) with a plurality of first planetary gears (44), and a planetary-gear operating section (5). The second link (4b) has a second link body (141) that is coupled interlockably to a second planetary gear group (140) with a plurality of second planetary gears (144).