Vehicle seat
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Solution Overview
Problem
Vehicle seats with movable portions in seatbacks or seat cushions face excessive displacement during vehicle circular motion, necessitating a solution to restrict unnecessary movement.
Innovation Solution
A vehicle seat design incorporating a movable portion with a displacement regulator system, featuring first and second springs, a preloading device, and locking pins, which allows the movable portion to return to a neutral position using elastic forces and varying preloads, and a locking function to restrict excessive displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a movable portion is included in the seatback or seat cushion to support the occupant during circular motion, then the occupant can be supported during vehicle motion, but the movable portion is displaced more than necessary
Solution Approach 1:
The preloading device applies a preliminary elastic force to the movable portion in advance, creating a counteracting force that prevents excessive displacement during vehicle circular motion. The spring is pre-compressed or pre-tensioned to generate a restoring force that opposes the inertial force before the motion occurs
Solution Approach 2:
The movable portion is pre-positioned at a neutral position using the preloading device, which sets the initial state of the spring system. This preliminary positioning ensures that the movable portion starts from an optimal position that minimizes excessive displacement during subsequent vehicle motion
2Adaptability or versatility
If the movable portion is displaceable to support the occupant, then the seat adapts to vehicle motion, but the movable portion cannot be restricted to prevent excessive displacement
Solution Approach 1:
The preloading device creates a preliminary counteracting force that limits the range of motion of the movable portion. The spring is pre-loaded to generate a restoring force that opposes excessive displacement, thereby controlling the movable portion's movement while maintaining adaptability
Solution Approach 2:
The preloading device changes the elastic force parameter of the spring system by applying a preliminary load. This parameter change modifies the stiffness characteristics of the movable portion, allowing it to adapt to motion while preventing excessive displacement through the adjusted spring force
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 system effectively inhibits excessive displacement of the movable portion, ensuring it remains in the neutral position by utilizing elastic forces and varying preloads, thereby enhancing occupant stability during vehicle motion.
Implementation Method 1
a first spring capable of exerting an elastic force as the movable portion is displaced in a first direction, the elastic force exerted by the first spring being used to displace the displaced movable portion toward a specified neutral position
Implementation Method 2
a second spring capable of exerting an elastic force as the movable portion is displaced in a second direction that is different from the first direction, the elastic force exerted by the second spring being used to displace the displaced movable portion toward the neutral position
Data Source
AI summary
A vehicle seat includes a movable portion, a first spring, a second spring, and a preloading device. The first spring is capable of exerting an elastic force to displace the movable portion, which is displaced in a first direction, toward the neutral position. The second spring is capable of exerting an elastic force to displace the movable portion, which is displaced in a second direction, toward the neutral position. The preloading device is capable varying at least one of an elastic force applied by the first spring to the movable portion placed in the neutral position or an elastic force applied by the second spring to the movable portion placed in the neutral position.