Shock-absorbing device with dual concentric guides
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Solution Overview
Problem
Existing shock-absorbing devices for vehicle components, such as glove box lids, face issues with stable guidance and reduced sliding amount due to spring contraction, leading to inadequate shock-absorbing performance.
Innovation Solution
A shock-absorbing device with a case member, a shock-absorbing member, and a spring, where the shock-absorbing member has an inner and outer cylinder with a spring bearing portion, and retaining means to prevent detachment, guiding the member using overlapping guides and a cylindrical space to ensure stable sliding and absorption of impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the axial length of the load bearing member is extended to improve guiding property, then the guiding property is improved, but the sliding amount is reduced and shock-absorbing performance deteriorates
Solution Approach 1:
The guiding function is segmented into two separate guiding portions: an inner guiding portion formed by the inner circumference of the proximal end side of the load bearing member and outer circumference of the shaft portion, and an outer guiding portion formed by the outer circumference of the load bearing member and inner circumference of the anchor strut portion. This segmentation allows each guiding portion to work independently at different radial positions, providing stable guidance without requiring increased axial length.
Solution Approach 2:
The invention transitions from single-point guidance to multi-point guidance by utilizing both inner and outer circumferential surfaces simultaneously. This dimensional expansion from one guiding interface to two concentric guiding interfaces improves guiding stability without extending the axial length of the load bearing member.
2Force
If the spring contracts when bearing load, then the shock-absorbing function is achieved, but the guiding function deteriorates causing unstable sliding
Solution Approach 1:
The guiding function is separated from the spring by introducing dedicated guiding portions on the shaft portion and anchor strut portion. The inner guiding portion provides guidance independent of spring contraction, while the outer guiding portion provides additional guidance support. This segmentation allows the spring to contract for shock absorption while maintaining reliable guidance through the separate guiding structures.
Solution Approach 2:
The shaft portion acts as an intermediary element that provides guiding function independently of the spring. The inner circumference of the shaft portion forms the inner guiding portion that guides the load bearing member during sliding, decoupling the guiding function from the spring's contraction motion.
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 device provides improved guiding properties and maintains a sufficient sliding amount, effectively absorbing impacts and vibrations by utilizing dual guides and a spring biasing mechanism, enhancing the overall shock-absorbing performance.
Implementation Method 1
a spring configured to bias the shock-absorbing member in a direction away from the case member
Implementation Method 2
an outer circumference of the outer cylinder of the shock-absorbing member is disposed in an inner circumference of the circumferential wall of the case member to function as a first guide for the shock-absorbing member when the shock-absorbing member slides
Implementation Method 3
an inner circumference of the inner cylinder of the shock-absorbing member is disposed on an outer circumference of the shaft portion of the case member to function as a second guide for the shock-absorbing member when the shock-absorbing member slides
Data Source
AI summary
There is provided a shock-absorbing device disposed between a fixed member and a movable member to suppress movement of the movable member. The shock-absorbing device includes a case member; a shock-absorbing member; and a spring. The case member has a bottom portion, a supporting portion, a shaft portion, and a circumferential wall. The shock-absorbing member has an inner cylinder into which the shaft portion is inserted, an outer cylinder, and a spring bearing portion. A retaining member is provided between the case member and the shock-absorbing member. An outer circumference of the outer cylinder is disposed in an inner circumference of the circumferential wall to function as a first guide for the shock-absorbing member, and an inner circumference of the inner cylinder is disposed on an outer circumference of the shaft portion to function as a second guide for the shock-absorbing member.