Elastic Resin Damper With Speed-Responsive Braking Force
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Solution Overview
Problem
Existing dampers for glove boxes lack high load response performance, as the braking force varies with moving speed, leading to inconsistent operation when opening or closing the glove box, especially due to weight of loads inside.
Innovation Solution
A damper design featuring a cylindrical cylinder with a piston made of elastic resin, where the piston has a convex portion in constant pressure contact with the cylinder's inner circumference and an engaging portion that applies axial compression force during braking, allowing the braking force to increase with moving speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the second seal member is increased in diameter by receiving air pressure to be in pressure contact with the inner circumference of the cylinder, then the braking force is strengthened, but the entire circumference of the second seal member is increased in diameter at a stretch making it difficult to provide load response performance
Solution Approach 1:
The piston is divided into multiple pressure contact portions (first pressure contact portion and second pressure contact portion) along the axial direction. This segmentation allows different portions to engage with the cylinder at different stages, enabling progressive braking force application rather than simultaneous engagement of the entire circumference, thus providing load response performance.
Solution Approach 2:
The piston is designed to dynamically change its pressure contact characteristics with the cylinder during operation. As the rod moves in the braking direction, the piston progressively engages different portions with the cylinder inner circumference, creating a dynamic braking force that responds to load conditions rather than a static uniform force.
2Object-affected harmful factors
If the braking force is applied to prevent sudden opening of the glove box, then the impact force is reduced, but when opened slowly by hand the braking force is weakened and when rapidly opened the braking force is strengthened
Solution Approach 1:
The braking force dynamically adjusts based on the rod's moving speed and direction. When the glove box is opened rapidly, the piston engages more extensively with the cylinder, increasing braking force to reduce impact. When opened slowly, the engagement is reduced, maintaining usability. The system automatically adapts to different opening speeds without manual intervention.
Solution Approach 2:
The braking force parameter changes in response to the rod's velocity and direction of movement. The piston-cylinder interaction creates a velocity-dependent braking characteristic where higher speeds generate higher braking forces, while lower speeds generate reduced braking forces, optimizing both impact reduction and ease of operation.
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 damper provides high load response performance by varying the braking force based on the moving speed of the rod, effectively reducing impact forces during glove box operation without compromising usability.
Implementation Method 1
a piston (50) formed of an elastic resin material... when an axial compression force acts on the piston, the piston is compressed from the other end side and in pressure contact with the inner circumference of the cylinder
Data Source
AI summary
A damper includes a cylinder, a rod including a first engaging portion at a tip end thereof, and a piston formed of an elastic resin material. The piston includes a convex portion provided so as to protrude at a base end portion located on a rod base end side and always in pressure contact with an inner circumference of the cylinder. During damper braking, the first engaging portion of the rod abuts against the other end portion of the piston, and an axial compression force acts on the piston between the first engaging portion and the convex portion in pressure contact with the inner circumference of the cylinder.