Robot Speed Reducer Gear Geometry for Lower Engagement Noise
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Solution Overview
Problem
Industrial robots require speed reducers that can minimize noise at the engagement between the input gear and transmission gears, as existing precision speed reducers often generate loud noise due to the higher speed of the input gear.
Innovation Solution
A speed reducer design featuring an outer tube with internal teeth, a carrier attached to an output shaft, crankshafts with eccentric portions, oscillating gears, and transmission gears, where the input gear engages with the transmission gears with 6 to 8 teeth, and is configured with a pressure angle of 14.5° to 20.0°, tooth thickness of 3 mm to 30 mm, and a module of 0.8 to 3.0.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the input gear rotates at high speed to achieve efficient power transmission, then the productivity is improved, but the noise generated at the engagement between the input gear and spur gears increases
Solution Approach 1:
The patent applies parameter changes by optimizing the number of teeth engagement between the input gear and spur gears to a specific range (6-8 teeth), and by setting the pressure angle within a specific range (14.5°-20.0°). These parameter adjustments reduce the noise generated during gear engagement while maintaining efficient power transmission, directly resolving the technical contradiction between productivity and noise reduction.
2Object-generated harmful factors
If the number of teeth engagement between input gear and spur gears is increased to reduce noise, then the noise level is lowered, but the device complexity increases
Solution Approach 1:
The patent resolves this contradiction by establishing an optimal parameter range for the number of teeth engagement (6-8 teeth) and pressure angle (14.5°-20.0°). This approach achieves noise reduction through precise parameter optimization rather than increasing device complexity, finding the sweet spot that balances noise reduction with maintaining a relatively simple gear configuration.
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
This configuration effectively reduces noise at the engagement between the input gear and transmission gears, allowing for the application of tall teeth in the transmission gears, thereby achieving a lower noise level suitable for industrial robots.
Implementation Method 1
crankshafts (13) rotatably supported by the carrier (12) and connected to the input shaft (3), the crankshafts (13) each having an eccentric portion eccentric to an axis of rotation of the output shaft
Data Source
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AI summary
A speed reducer 1 for an industrial robot according to the present invention, comprises an input gear 30 provided on an input shaft 3, the input gear 30 engaging with the transmission gears 20, 20A, 20B, 20C to synchronously rotate the transmission gears 20, 20A, 20B, 20C, wherein the input gear 30 and the transmission gears 20, 20A, 20B, 20C engage with each other with 6 to 8 teeth, and wherein the input gear 30 and the transmission gears 20, 20A, 20B, 20C are configured such that a pressure angle is no less than 14.5° and no more than 20.0°, a tooth thickness is no less than 3 mm and no more than 30 mm and a module (a pitch circle diameter/the number of teeth) is no less than 0.8 and no more than 3.0.