Vibrating Actuator Friction Member Layout for Abrasion Resistance
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Solution Overview
Problem
Existing vibrating actuators face issues with abrasion resistance and driving performance due to the use of low-density materials for friction members, leading to increased weight and decreased natural vibration frequency, resulting in abnormal sounds and degraded performance.
Innovation Solution
A vibrating actuator design featuring a contact body with a base part, thin plate part, and support part, where the friction member is made of an iron-based material with a higher density than the thin plate part, and the weight ratio of the thin plate part to the total weight of the support part and friction member is optimized between 0.5 to 1.5 to maintain high abrasion resistance and prevent performance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an iron-based material is used for the friction member to improve abrasion resistance, then abrasion resistance is improved, but the weight of the contact body increases and natural vibration frequency decreases
Solution Approach 1:
The contact body is divided into multiple parts: a lightweight main body (thin plate part) and a separate friction member. This segmentation allows the friction member to be made of high-density iron-based material for abrasion resistance while the main body remains lightweight, resolving the contradiction between abrasion resistance and overall weight.
Solution Approach 2:
The friction member is designed with a specific weight ratio (0.05 to 0.20) relative to the thin plate part, creating local quality optimization. This ensures that the high-density material is concentrated only where needed for friction contact, maintaining high abrasion resistance while controlling the overall weight and natural vibration frequency of the contact body.
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 solution effectively increases the natural vibration frequency, enhances abrasion resistance, and reduces abnormal sounds, ensuring stable and improved driving performance while using high-density materials for the friction member.
Implementation Method 1
a vibrating body that has an elastic body of an annular shape and an electro-mechanical energy conversion element
Implementation Method 2
a contact body of an annular shape configured to be in contact with the elastic body, wherein the vibrating body and the contact body are configured to move relative to each other by vibration of the vibrating body
Data Source
AI summary
A vibrating actuator includes a contact body and a vibrating body that vibrates, has an energy conversion element, and has an elastic body in contact with the contact body to move relative to each other from the vibration. The contact body has a base part, a thin plate part, a support part, and a friction member. The thin plate part extends from the base part toward an annular center axis of the base part and the support part is disposed at an end of the thin plate part. The friction member is disposed to the support part as a member separate from the support part and in contact with the elastic body. Density of the friction member is higher than density of the thin plate part. A weight ratio of the thin plate part to a total weight of the friction member and the support part is 0.5 to 1.5.