Nested Decelerator for Compact Motor Brake Design
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Solution Overview
Problem
Existing motor brakes with multiple planet gear units stacked axially in the motor brake increase the overall axial thickness, leading to space utility issues while attempting to achieve an enhanced deceleration ratio.
Innovation Solution
A decelerator configuration that includes a first deceleration unit with a sun gear, planet gears, and a ring gear, and a second deceleration unit with an inner gear and outer gear featuring cycloid teeth, allowing for eccentric rotation and multi-stage deceleration without increasing the axial thickness, integrated with a motor brake system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple planet gear units are stacked axially to increase deceleration ratio, then deceleration ratio is improved, but axial thickness increases excessively
Solution Approach 1:
The patent implements nesting by placing the first deceleration unit (planet gears) inside the second deceleration unit (cycloid mechanism). The planet gears rotate within the annular space between the cycloid pin joint and the outer gear, allowing both deceleration stages to occupy overlapping spatial volumes rather than requiring axial stacking. This nested configuration achieves multi-stage deceleration while maintaining compact axial thickness.
2Power
If multiple planet gear units are stacked axially to increase deceleration ratio, then deceleration ratio is improved, but space utility deteriorates
Solution Approach 1:
The patent implements nesting by placing the first deceleration unit (planet gears) inside the second deceleration unit (cycloid mechanism). The planet gears rotate within the annular space between the cycloid pin joint and the outer gear, allowing both deceleration stages to occupy overlapping spatial volumes rather than requiring axial stacking. This nested configuration achieves multi-stage deceleration while maintaining compact axial thickness.
3Ease of manufacture
If planet gears are configured to rotate on fixed shafts, then manufacturing is simplified, but deceleration ratio is limited
Solution Approach 1:
The patent applies dynamics by replacing fixed shafts with a cycloid pin joint that enables dynamic, eccentric rotation of the planet gears. The planet gears rotate about moving centers rather than fixed axes, allowing the gear train to achieve higher deceleration ratios through the combined motion of the cycloid mechanism and planet gear rotation. This dynamic configuration maximizes deceleration capability while maintaining manufacturability.
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 decelerator effectively increases the deceleration ratio while maintaining a compact axial thickness, enhancing space utility and enabling increased drive power without excessive length, suitable for various motor-powered devices.
Implementation Method 1
an inner gear which is formed on an outer circumference thereof with cycloid teeth so as to eccentrically rotate along with the ring gear
Implementation Method 2
an outer circumference of the bearing may slip on the inner circumference of the inner gear
Data Source
AI summary
Disclosed herein are a decelerator in which a first deceleration unit of a planet gear type is provided inside a second deceleration unit of a cycloid type so as to apply eccentric rotation force to the second deceleration unit, and a motor brake with the same. The decelerator restricts an increase in the axial thickness of a motor and achieves an effectively increased deceleration ratio, and the motor brake equipped with the decelerator restricts an increase of the overall length thereof due to the decelerator, achieving enhanced space utility.