Resin Reduction Gear Reinforcement for Noise Control
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Solution Overview
Problem
Conventional reduction gears used in electric vehicle gate motors face challenges in reducing mechanical noise while maintaining a compact size, as increasing the wall thickness of a resin case to reduce noise leads to increased weight and space constraints, and vice versa.
Innovation Solution
A reduction gear with a resin case incorporating two-stage planetary gear mechanisms and a reinforcing component with a higher Young's modulus, extending along the inner peripheral surface, is used to enhance the axial central portion's strength, reducing noise without increasing size, and a geared motor with this reduction gear improves quietness without size augmentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the wall thickness of the resin case is increased to reduce mechanical noise, then noise reduction is achieved, but the space inside the case cannot be secured and the reduction gear becomes large
Solution Approach 1:
The invention uses a composite structure combining resin and metal materials. The case is made of resin for noise absorption, while metal reinforcing components are integrated into the case to provide structural strength. This allows the case wall thickness to be reduced while maintaining noise reduction performance and structural integrity, thereby securing space inside the case without increasing overall size.
Solution Approach 2:
The invention applies reinforcing components at specific locations within the case rather than uniformly increasing wall thickness throughout. The metal reinforcing components are strategically positioned to provide local strength enhancement where needed, allowing the majority of the case structure to maintain thinner walls for space efficiency while still achieving noise reduction goals.
2Object-affected harmful factors
If the wall thickness of the resin case is increased to reduce mechanical noise, then noise reduction is achieved, but the weight of the reduction gear increases
Solution Approach 1:
The invention uses a composite structure combining resin and metal materials. The case is made of resin for noise absorption, while metal reinforcing components are integrated into the case to provide structural strength. This allows the case wall thickness to be reduced while maintaining noise reduction performance and structural integrity, thereby securing space inside the case without increasing overall size.
Solution Approach 2:
The invention applies reinforcing components at specific locations within the case rather than uniformly increasing wall thickness throughout. The metal reinforcing components are strategically positioned to provide local strength enhancement where needed, allowing the majority of the case structure to maintain thinner walls for space efficiency while still achieving noise reduction goals.
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 reduces mechanical noise and maintains space within the resin case, preventing size increase, while enhancing the strength of the axial central portion to suppress vibrations, thus improving quietness without enlarging the motor.
Implementation Method 1
a reinforcing component that is formed of a material having a Young's modulus higher than that of a material of the case and extends along at least a part of an inner peripheral surface in an axial central portion of the case
Data Source
AI summary
A reduction gear configured to decelerate and output rotation of a motor by two-stage planetary gear mechanisms disposed side by side in an axial direction includes: a case made of resin, the case being formed into a cylindrical shape in which the two-stage planetary gear mechanisms are incorporated, and having at least one of a lid portion and a bottom portion provided at each of both axial ends; and a reinforcing component that is formed of a material having a Young's modulus higher than a Young's modulus of a material of the case. The reinforcing component extends along at least a part of an inner peripheral surface in an axial central portion of the case.