Differential Bevel Gear Speed Reducer Design
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Solution Overview
Problem
Current differential planetary gear speed reducers face issues with noise, wear, and durability due to the need for addendum modification adjustments, and have manufacturing difficulties, while worm speed reducers suffer from friction-induced problems and low efficiency.
Innovation Solution
The design converts the fixed center of rotation of differential planetary gears into a Bevel gear combination with different pitch circle centers, using three Bevel gears with the same module value and tooth form to eliminate the need for addendum modification adjustments, allowing for proper meshing and efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If profile shifted gears with adjusted addendum modification are used in differential planetary speed reducer, then the pitch circle circumference can be adjusted, but manufacturing difficulty increases and noise, wear, and durability problems occur
Solution Approach 1:
The invention changes the fundamental parameter of gear engagement by transitioning from profile shifted gears (adjusted addendum modification) to non-profile shifted gears with different numbers of teeth. This parameter change allows pitch circle circumference adjustment through tooth count variation rather than profile modification, simplifying manufacturing and eliminating associated noise and durability issues
Solution Approach 2:
Instead of adjusting the addendum modification coefficient to achieve different pitch circle circumferences (conventional approach), the invention inverts the approach by using gears with different numbers of teeth but standard profiles. This inversion resolves the manufacturing complexity and reliability issues inherent in profile shifted gears
2Adaptability or versatility
If profile shifted gears are used to achieve different pitch circle circumferences, then speed reduction ratios can be varied, but the gears become difficult to manufacture with consistent quality
Solution Approach 1:
The invention achieves speed reduction ratio variation by changing the number of teeth parameter rather than the profile modification parameter. This allows different speed ratios while maintaining standard gear profiles, ensuring manufacturing precision and quality consistency across all gears in the differential planetary system
3Ease of manufacture
If worm speed reducer is used for simple structure and ease of manufacture, then manufacturing is simplified, but friction-induced wearing, heating, and low efficiency occur
Solution Approach 1:
The invention replaces the worm gear mechanical system with a differential planetary gear system using non-profile shifted gears. This substitution eliminates the sliding friction characteristic of worm gears, reducing wearing and heating while improving efficiency, while maintaining ease of manufacture through standard gear profiles
Data Source
AI summary
A differential Bevel gear speed reducer consisting of standard type gears, each of the standard type gears having a same tooth form and a same gear module value, wherein three identical pinion Bevel gears are located between an input Bevel gear and an output Bevel gear, revolution-inducing Bevel gears that have a same number of teeth, a same module value, and a same cone apex as the pinion Bevel gears are fixedly placed at an outer side of axes of the three pinion Bevel gears, an orbit Bevel gear that is engaged with the revolution-inducing Bevel gears is fixedly placed at inside of a housing, causing the pinion Bevel gears and the revolution-inducing Bevel gear to revolve along an orbit of the orbit Bevel gear as the input Bevel gear revolves, and the rotation of the input Bevel gear causes differential rotation of the output Bevel gear.