Multi-Stage Servo Reducer With Automatic Backlash Compensation
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Solution Overview
Problem
Conventional servos experience gear wear and increased backlash, affecting their performance and service life.
Innovation Solution
A servo reducer with an automatic backlash compensation function, featuring a multi-stage gear system with a clutch spring and adjusting spring to maintain precise meshing of gears, converting excess load energy into friction heat and adjusting for wear through axial movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional gear transmission is used without compensation mechanism, then the structure is simple and easy to manufacture, but backlash increases after long-term use affecting performance
Solution Approach 1:
The spring mechanism automatically adjusts the meshing position of gears to compensate for wear and backlash. The system self-regulates by allowing axial movement of the third-stage shaft gear relative to the output gear, maintaining precise meshing without external intervention or manual adjustment throughout the servo reducer's operational life.
Solution Approach 2:
The patent changes the axial position parameter of the third-stage shaft gear dynamically through spring force. By allowing the gear to move axially within a controlled range, the meshing parameters between gears are continuously adjusted to compensate for wear, transforming a static gear system into a dynamically adjustable one that maintains optimal performance.
2Duration of action of moving object
If fixed meshing position is used, then manufacturing is simple, but gear wear cannot be compensated leading to performance degradation
Solution Approach 1:
The patent transforms the static fixed meshing position into a dynamic adjustable position. The third-stage shaft gear is designed to move axially under spring force, creating a dynamic system that automatically adapts to gear wear over time. This dynamic adjustment extends the service life by maintaining precise meshing throughout the operational lifespan of the servo reducer.
3Reliability
If axial movement is allowed for compensation, then backlash is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The spring acts as an intermediary element between the third-stage shaft gear and the housing. Instead of requiring direct precision control of the gear's axial position through manufacturing, the spring provides a compliant, self-adjusting mechanism that tolerates manufacturing variations while still achieving precise meshing. This intermediary absorbs the complexity of precision control, making the system more manufacturable.
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
Ensures precise gear meshing throughout the servo reducer's life cycle, extending its service life and maintaining performance by preventing backlash.
Implementation Method 1
converting excess load energy into friction heat
Implementation Method 2
The clutch spring is sleeved on the third-stage shaft. A first end of the clutch spring is fixedly connected to the third-stage plate gear. A second end of the clutch spring is fixedly connected to the baffle ring to apply an elastic force enabling the second teeth being meshed with the first teeth
Implementation Method 3
The adjusting spring is sleeved on the third-stage shaft. A first end of the adjusting spring is connected to the baffle ring. A second end of the adjusting spring is connected to the support structure to apply an elastic force enabling the output gear being meshed with the third-stage shaft gear
Data Source
AI summary
A servo reducer includes a motor gear connected to a driving motor, a support structure, a first-stage gear set, a first-stage shaft, a second-stage gear set, a second-stage shaft, a third-stage gear set, a third-stage shaft, and an output gear meshed with the third-stage gear set. The first-stage shaft, the second-stage shaft, and the third-stage shaft are mounted on the support structure. The first-stage gear set is mounted on the first-stage shaft and is meshed with the motor gear. The second-stage gear set is mounted on the second-stage shaft and is meshed with the first-stage gear set. The third-stage gear set is mounted on the third-stage shaft and is meshed with the second-stage gear set. When an external load exceeds an allowable limit of a gear strength, external load energy is converted into friction heat between the teeth and consumed, so no backlash is defined.