Planetary Gear Layout for Compact Decelerating Mechanisms
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Solution Overview
Problem
Conventional decelerating mechanism transmission systems require longer planetary shafts due to gaps for interference avoidance, leading to increased volume and shaking/deflection issues.
Innovation Solution
A transmission system design with a holder and planetary gear unit where first and second gears are arranged on opposite sides of the carrier, reducing the need for gaps between gears and shafts, thus minimizing shaft lengths and overall volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gaps are reserved between gears and carrier to avoid interference, then the gears can rotate without interference, but the planetary shafts become longer leading to increased volume and shaking
Solution Approach 1:
The patent transitions from a conventional single-sided gear arrangement to a dual-sided arrangement where first gears are disposed on one side of the carrier and second gears are disposed on the opposite side. This dimensional reorganization allows gears to be positioned closer to the carrier without interference, reducing the required planetary shaft length and overall transmission system volume while maintaining reliable operation.
Solution Approach 2:
The patent employs a compact nested arrangement where first and second gears are positioned on opposite sides of the carrier, effectively nesting the gear train within a shorter axial space. This nesting approach reduces the overall length of planetary shafts required while ensuring proper gear engagement and avoiding interference between components.
2Reliability
If gaps are reserved between gears and carrier to avoid interference, then the gears can rotate without interference, but the planetary shafts become longer leading to increased shaking and deflection
Solution Approach 1:
By arranging first gears on one side of the carrier and second gears on the opposite side, the patent reduces the axial length of planetary shafts. This shorter shaft configuration minimizes shaking and deflection during rotation, significantly improving the stability of the planetary gear set while still preventing gear interference through the optimized spatial arrangement.
Solution Approach 2:
The patent creates an asymmetric distribution of gears relative to the carrier, with first gears positioned on one side and second gears on the other. This asymmetric arrangement optimizes the spatial relationship between components, allowing for shorter planetary shafts that exhibit reduced deflection and shaking, thereby enhancing overall gear set stability.
3Reliability
If longer planetary shafts are used to accommodate gap requirements, then gear interference is avoided, but the transmission system requires larger receiving space
Solution Approach 1:
The patent reorganizes the gear train from a conventional single-sided layout to a dual-sided layout around the carrier. This dimensional change allows the transmission system to fit within a more compact axial space, reducing the required receiving space in the casing while maintaining adequate clearance to prevent gear interference through the optimized opposite-side arrangement.
4Reliability
If longer planetary shafts are used to accommodate gap requirements, then gear interference is avoided, but the overall volume of the decelerating mechanism increases
Solution Approach 1:
By disposing first gears on one side of the carrier and second gears on the opposite side, the patent compresses the transmission system into a shorter axial envelope. This dimensional reorganization eliminates the need for excessively long planetary shafts, thereby reducing the overall volume of the decelerating mechanism while ensuring reliable gear operation without interference.
Data Source
AI summary
A transmission system of a decelerating mechanism includes a planetary gear unit including a sun gear being adjacent to the first surface and a planetary gear set and a holder including a carrier and several planetary shaft units rotatably disposed on the carrier. The carrier has a first surface and a second surface that face opposite directions. The planetary gear set has several first gears being adjacent to the first surface, respectively fitting around the planetary shaft units, and meshing with the sun gear, several second gears being adjacent to the second surface and being coaxially disposed with the first gears, and an internal gear ring meshing with the second gears. By respectively arranging the first gears and the second gears on two opposite sides of the carrier, mutual interference therebetween while turning could be avoided, and an overall volume of the transmission system could be reduced.