Reducer Ring Gear Cushioning for Planetary Gear Noise Reduction
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Solution Overview
Problem
Car winches generate excessive noise due to mechanical vibrations from the first stage planetary gear set in existing reducers, which are integrally formed and fixed, leading to loud noise levels of 85 dB-95 dB during operation.
Innovation Solution
A reducer design incorporating a casing with an internal ring gear and an elastic cushion that limits rotation and reduces vibration by providing a flexible interface between the internal ring gear and the casing, avoiding direct rigid contact and allowing for relative movement to mitigate noise and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the internal ring gear is integrally formed and fixed on the casing by cold extrusion, then the structural strength and rigidity are improved, but the mechanical vibration and noise increase significantly
Solution Approach 1:
The patent introduces a cushioning element as an intermediary component between the internal ring gear and the casing. This cushioning element absorbs mechanical vibrations and reduces noise transmission while maintaining the structural connection, thus resolving the contradiction between structural strength and noise reduction.
Solution Approach 2:
The patent changes the connection parameters from rigid cold extrusion to a flexible cushioning connection. By altering the mechanical properties of the connection interface, the system achieves both structural integrity and vibration damping, reducing noise levels.
2Stability of the object's composition
If the internal ring gear is rigidly fixed to the casing, then the positional stability is improved, but the mechanical vibration increases
Solution Approach 1:
The cushioning element serves as a mediator that provides positional stability through controlled flexibility. It allows the internal ring gear to maintain its position while absorbing vibrational energy, thus reducing mechanical vibration without compromising stability.
Solution Approach 2:
The patent applies cushioning before the vibration problem occurs by pre-installing the cushioning element between the internal ring gear and the casing. This preventive measure absorbs vibrations during operation, reducing mechanical vibration while maintaining positional stability.
3Ease of manufacture
If cold extrusion is used to fix the internal ring gear, then the manufacturing simplicity is improved, but the noise level increases to 85 dB-95 dB
Solution Approach 1:
The cushioning element is introduced as a simple intermediary component that can be easily manufactured and installed. It effectively reduces noise levels from 85 dB-95 dB to acceptable levels while maintaining manufacturing simplicity through its straightforward design and installation process.
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 noise and vibration by suspending the internal ring gear, allowing for flexible contact and adjusting the gap between components, thereby minimizing mechanical noise during operation.
Implementation Method 1
The elastic cushion has at least a portion located between the second limiting part and the inner circumferential wall of the casing and abuts against the second limiting part and the inner circumferential wall of the casing
Data Source
AI summary
The present disclosure relates to a reducer. The reducer includes a casing, an internal ring gear and an elastic cushion. The casing has an inner circumferential wall provided with a first limiting part. The internal ring gear is arranged in the casing and has an outer circumferential wall provided with a second limiting part. The first limiting part is fitted with the second limiting part to limit rotation of the internal ring gear. The elastic cushion has at least a portion located between the second limiting part and the inner circumferential wall of the casing and abutting against the second limiting part and the inner circumferential wall of the casing.