Leaf Spring Suspension Roller Hold for Wear and Noise Reduction
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Solution Overview
Problem
Durability deterioration and abnormal noise occur due to friction between the leaf spring and the holding member in conventional leaf spring type suspension devices.
Innovation Solution
A vehicle suspension device with a leaf spring, a locking member, and a holding member that includes rotatable rollers and a pressing member, where the leaf spring is sandwiched between the rollers and the pressing member, and a biasing member biases the rollers to reduce friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the end of the leaf spring is held by a slide seat, then the leaf spring can be supported and displacement can be guided, but durability deteriorates due to wear caused by friction between the slide seat and the leaf spring
Solution Approach 1:
A roller is introduced as an intermediary component between the leaf spring end and the holding member. The roller rotates as the leaf spring displaces, converting sliding friction into rolling friction, thereby significantly reducing wear on the leaf spring and improving durability
Solution Approach 2:
The sliding contact mechanism is replaced with a rolling contact mechanism. By substituting the slide seat with a roller that rotates during displacement, the mechanical interaction changes from sliding friction to rolling friction, reducing wear and enhancing reliability
2Stability of the object's composition
If the end of the leaf spring is held by a slide seat, then the leaf spring can be supported and displacement can be guided, but abnormal noise occurs due to friction during sliding
Solution Approach 1:
The roller acts as a mediator between the leaf spring and the holding member, converting the sliding friction that generates noise into rolling motion, thereby eliminating abnormal noise while maintaining position stability
Solution Approach 2:
The sliding friction-based position guidance mechanism is replaced with a rolling friction-based mechanism. The roller rotates to guide displacement while minimizing noise-generating friction, achieving stable positioning without abnormal noise
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
Suppresses durability deterioration and abnormal noise by minimizing friction between the leaf spring and the holding member through roller rotation, maintaining vehicle height and improving vibration-proof properties.
Implementation Method 1
a roller configured to hold the other end of the leaf spring and be rotatable while following displacement of the other end of the leaf spring
Implementation Method 2
a biasing member configured to bias the roller and the pressing member in a direction in which the roller and the pressing member approach each other
Data Source
AI summary
A vehicle suspension device according to the present invention is a suspension device and includes: a leaf spring; a locking member to which one end of the leaf spring is locked; and a holding member configured to hold another end of the leaf spring. The holding member includes: a roller configured to hold the other end of the leaf spring and be rotatable while following displacement of the other end of the leaf spring; and a pressing member facing the roller, and the other end of the leaf spring is provided between the roller and the pressing member.