Long Rail Assembly With Shielded Rack-and-Pinion Drive
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Solution Overview
Problem
Existing power adjustment systems in vehicles suffer from inefficiency and failure due to dirt and debris accumulation on mechanical parts, which are not adequately protected from the environment.
Innovation Solution
A long rail assembly with a lower channel, an inverted U-shaped upper channel, a gearbox, a rack, a pinion, and a motor, where the gearbox is housed within the upper channel, the rack is mounted within the lower channel with gear teeth facing downwards, and the motor powers the system to adjust seat positions while shielding mechanical parts from debris.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mechanical parts are integrated with the vehicle floor for power adjustment, then the system can achieve seat position adjustment, but dirt and debris accumulate on the mechanical parts causing inefficiency and failure
Solution Approach 1:
The patent extracts the mechanical parts (gearbox, rack, pinion) from direct contact with the vehicle floor by elevating them on support structures. This separation removes the harmful interaction between debris-prone floor area and sensitive mechanical components, allowing power adjustment functionality to be maintained while eliminating the reliability issue caused by dirt accumulation.
Solution Approach 2:
The patent introduces an intermediary protective structure (channel assembly with cover) between the mechanical parts and the contaminated environment. This intermediary enclosure shields the mechanical components from dirt and debris while still allowing the system to perform its power adjustment function, thus resolving the contradiction between operational capability and reliability.
2Device complexity
If mechanical parts are exposed to the vehicle floor environment, then the system structure can be simplified, but dirt and debris buildup causes the system to stop working
Solution Approach 1:
The patent implements a nested structure where the mechanical components (gearbox, rack, pinion) are housed within the upper channel, which is itself supported by the lower channel. This nested arrangement provides protective enclosures without adding excessive external complexity, maintaining structural efficiency while preventing debris contact that would cause system failure.
Solution Approach 2:
The patent uses channel structures with covers that act as protective shells enclosing the mechanical parts. These shell-like enclosures provide effective protection against dirt and debris accumulation while maintaining a relatively simple overall structure, resolving the contradiction between structural simplicity and reliability.
3Ease of operation
If the rack gear teeth are oriented upward for engagement, then the pinion can mesh effectively, but dirt accumulation on the teeth causes inefficiency and failure
Solution Approach 1:
The patent inverts the conventional orientation of the rack gear teeth from upward-facing to downward-facing. This inversion causes debris to fall away from the gear engagement area rather than accumulating on the teeth, while the pinion still meshes effectively with the teeth from below. This resolves the contradiction between effective gear engagement and resistance to dirt accumulation.
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 solution effectively prevents dirt and debris from accumulating on mechanical components, enhancing the longevity and efficiency of the power adjustment system by keeping critical parts elevated and protected from the vehicle floor.
Implementation Method 1
The pinion is meshingly engaged with the gear teeth
Implementation Method 2
The upper channel is slidably coupled to the lower channel
Data Source
AI summary
A long rail assembly for use in a vehicle includes a lower channel, an inverted U-shaped upper channel, a gearbox, a rack, a pinion, a drive shaft, and a motor. The lower channel is adapted to extend longitudinally along a floor of the vehicle. The upper channel is slidably coupled to the lower channel. The gearbox is fixedly secured to and housed within the upper channel. The rack is fixedly coupled to the lower channel and includes gear teeth extending along the rack in a longitudinal direction. The pinion is meshingly engaged with the gear teeth. The drive shaft operatively couples the gearbox to the pinion. The motor is operatively coupled to the gearbox to power drive the upper channel along the lower channel.