Three-Layer Soft Rubber Wheel for Shock Absorption and Noise Reduction
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Solution Overview
Problem
Existing wheel structures face issues with rotational resistance, noise, and inadequate shock absorption, particularly when subjected to heavy loads or uneven surfaces, as they either deform excessively or fail to provide effective support.
Innovation Solution
A three-layer soft rubber shock absorbing wheel is designed with a hub bonded to a hard body and two elastic tread layers of different hardness, where the second tread layer is bonded to a concave surface of the first tread layer, creating an I-shaped structure for improved shock absorption and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tread is made of soft material to improve shock absorption, then shock absorption is improved, but rotational resistance increases under heavy load
Solution Approach 1:
The wheel is divided into three distinct layers: a hard body layer (50-70 Shore A hardness) for structural support and low rotational resistance, a first elastic tread layer (40-60 Shore A hardness) for shock absorption, and a second softer elastic tread layer (30-50 Shore A hardness) for noise reduction and enhanced comfort. Each layer performs its specific function to resolve the contradiction between softness and rotational resistance.
Solution Approach 2:
Different regions of the wheel are assigned different material properties: the inner hard body provides rigidity where structural support is needed, while the outer elastic layers provide softness where shock absorption and noise reduction are required. This local differentiation allows the wheel to simultaneously achieve low rotational resistance and effective shock absorption.
2Force
If the tread is made of hard material to reduce rotational resistance, then rotational resistance is reduced, but shock absorption and noise reduction fail
Solution Approach 1:
The wheel structure separates the functions of low rotational resistance and shock absorption into different layers. The hard body layer handles rotational resistance requirements, while the two elastic tread layers handle shock absorption and noise reduction, eliminating the need to compromise between these conflicting requirements.
Solution Approach 2:
The wheel uses a composite structure combining hard body material and elastic rubber materials with different hardness levels. This composite approach allows the wheel to exhibit both the low rotational resistance of hard materials and the superior shock absorption of soft materials simultaneously.
3Strength
If the wheel uses a single-layer hard structure to maintain support under load, then supporting force is maintained, but noise increases when hitting rough surfaces
Solution Approach 1:
The wheel is segmented into a hard body layer for maintaining supporting force and two elastic tread layers for noise reduction. The elastic layers act as vibration dampers that absorb impact noise when the wheel hits rough surfaces, while the hard body ensures adequate supporting force is maintained.
Solution Approach 2:
The elastic tread layers function as flexible protective shells that cover the hard body. These flexible layers absorb impact noise and vibrations when the wheel contacts rough surfaces, while the underlying hard body maintains the necessary supporting 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 three-layer wheel effectively reduces noise and rotational resistance, enhances comfort by minimizing shock felt by the driver, and extends the service life of the wheels by providing better support and braking performance across varying loads.
Implementation Method 1
The first layer of tread and the second layer of tread are both elastic bodies
Implementation Method 2
two layers of soft rubber with different hardness, i.e., the first layer of tread and the second layer of tread, have good effects on shock absorption
Data Source
AI summary
A three-layer soft rubber shock absorbing wheel including a hub. An outer surface of the hub is bonded with a hard body, a first layer of tread and a second layer of tread having a hardness lower than that of the first layer of tread. The hard body, the first layer of tread, and the second layer of tread are arranged from inside to outside in sequence. The second layer of tread is bonded in a concave surface portion on an outer surface of the first layer of tread. The first layer of tread and the second layer of tread are both elastic bodies. The hard body is configured to have an I-shaped structure body. The three-layer soft rubber shock absorbing wheel is a wheel body made by bonding three layers of materials with different hardness.