Vibration Generator Leaf Spring Stress Distribution
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Solution Overview
Problem
Existing vibration generators for portable terminals face challenges in reducing stress on leaf springs, leading to durability issues and noise generation, and have complex, costly structures.
Innovation Solution
A vibration generator design featuring band-like leaf springs with connection and attachment portions arranged intersecting the vibration direction, and an intermediate portion extending across the vibration direction, dispersing stress through curved sections to prolong lifespan and reduce manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If leaf springs are bent at an acute angle to support the vibrating body, then the vibrating body can be held in position, but large stresses are generated in the bent portions leading to fatigue and destruction
Solution Approach 1:
The leaf spring is designed with a curved intermediate portion instead of acute angle bends. This curvature distributes the stress more evenly along the leaf spring structure, preventing stress concentration at sharp corners and reducing fatigue damage, thereby improving reliability while maintaining strength
2Ease of operation
If complex elastic member structures with detachable components are used, then assembly and disassembly become easier, but manufacturing cost and structural complexity increase
Solution Approach 1:
The elastic member is divided into distinct functional portions: a connection portion for attaching to the vibrating body, an intermediate portion with curved stress-distributing geometry, and an attachment portion for securing to the housing. This segmentation allows each portion to be optimized independently while maintaining overall simplicity and reducing manufacturing complexity
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 design effectively disperses stress, enhancing the lifespan of the vibration generator, simplifying the structure, and reducing noise, while allowing for cost-effective manufacturing.
Implementation Method 1
a coil and a magnet arranged in an opposing relationship with the coil, and configured to reciprocatingly vibrate in one direction
Implementation Method 2
a band-like leaf spring arranged between the vibrating body and the circumferential wall portion to support the vibrating body on the circumferential wall portion
Data Source
AI summary
A vibration generator includes a housing, a vibrating body, and a leaf spring. The leaf spring includes a connection portion connected to the vibrating body at one longitudinal end of the leaf spring, an attachment portion attached to a circumferential wall portion at the other longitudinal end of the leaf spring and an intermediate portion formed between the connection portion and the attachment portion to extend around the vibrating body. The connection portion and the attachment portion are arranged along a direction intersecting a vibration direction of the vibrating body at the opposite sides of the vibrating body. The intermediate portion is arranged in an outside region around the vibrating body to extend across the vibration direction of the vibrating body.