Multi-Stage Reduction Gear with Nested Planetary Stages
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Solution Overview
Problem
Existing multi-stage reduction gears struggle to achieve even higher overall transmission ratios while maintaining a compact and cost-effective design, particularly for applications requiring high precision and torque transmission.
Innovation Solution
A multi-stage reduction gear design featuring a planetary first stage and a second stage with two pinions meshing with a large wheel, where the first pinion is non-rotatably connected to the planet carrier and the second pinion is connected to the ring gear via a spur gear stage, with a common ring gear component and adjustable conical pinions to minimize play, allowing for high torque transmission and flexibility in installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a multi-stage reduction gear uses conventional planetary gear arrangements, then a compact design with high transmission ratio is achieved, but the overall transmission ratio is limited and cannot be increased further
Solution Approach 1:
The reduction gear is divided into multiple independent planetary gear stages, each contributing to the overall transmission ratio. The first planetary gear stage (with sun gear 1, planet gears 2, and ring gear 3) and the second planetary gear stage (with sun gear 4, planet gears 5, and ring gear 6) are segmented separately, allowing each stage to be optimized independently while achieving a compounded high transmission ratio when combined.
Solution Approach 2:
The second planetary gear stage is nested within the structure of the first stage by sharing the ring gear 3 as a mounting support for sun gear 4. This nesting approach allows multiple reduction stages to be compactly arranged without requiring separate housings or大幅增加 the overall footprint, maintaining a space-efficient design.
2Device complexity
If the transmission ratio is increased by adding more planetary stages, then higher transmission ratios are achieved, but the device becomes more complex and expensive to produce
Solution Approach 1:
Ring gear 3 serves multiple functions: it acts as the output element of the first planetary stage and simultaneously provides structural support and mounting for sun gear 4 of the second stage. This multi-functionality reduces the total number of separate components needed, simplifying manufacturing and assembly processes while achieving high transmission ratios.
Solution Approach 2:
The patent combines multiple planetary gear stages into a single integrated transmission unit where components serve dual purposes. The planet carriers and ring gears are designed to accommodate multiple stages, merging what would traditionally be separate transmissions into one compact, cost-effective unit.
3Ease of operation
If pinions and large wheel are used with fixed positions, then the structure is simple, but toothing play cannot be adjusted and precision is reduced
Solution Approach 1:
The pinions (7, 8) are designed with adjustable axial positions relative to the large wheel (9), allowing the meshing clearance and toothing play to be dynamically adjusted during assembly or maintenance. This adjustability ensures optimal engagement under different operating conditions while maintaining a relatively simple overall structure.
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 design achieves very high transmission ratios with a compact and inexpensive setup, suitable for applications like robot transmissions, and allows for adjustable precision and torque handling, with the option to combine multiple reduction gears for increased power transmission.
Implementation Method 1
a plurality of first planet gears (2) rotatably mounted in a first rotatably mounted planet carrier (10), which are in simultaneous toothed engagement with the first sun gear (1) and a likewise rotatably mounted first ring gear (3)
Implementation Method 2
a second reduction stage comprises at least two pinions (4, 6), which mesh with a large wheel (2) at different points on the circumference
Implementation Method 3
the pinions and the large wheel can be conical, with adjustment means also being available for setting the axial position of each pinion relative to the large wheel, so that the toothing play can be adjusted and minimized
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The invention relates to a multi-stage reduction gear, in which a first reduction stage is designed as a planetary transmission (8) with a first sun gear (22) that can be driven, several first planetary gears (20) that are rotatably mounted in a first rotatably mounted planetary carrier (10), said gears simultaneously engaging with the first sun gear (22) and a rotatably mounted first internal gear (16). A second reduction stage comprises at least two pinions (4, 6), both of which engage with a large wheel (2) at different points on the circumference of the latter. The first pinion (4) is rotationally fixed to the first planetary carrier (10) and at least the second pinion (6) has a drive connection to the first internal gear (16) by means of a toothed wheel stage (12, 14) that reverses the direction of rotation. An additional reduction stage, designed as a planetary stage, is connected in front of the first reduction stage. In said additional stage, a second planetary carrier (24) is rotationally fixed to the first sun gear (22), second planetary gears (26) are rotatably mounted in the second planetary carrier (24) and are in constant engagement with both a rotationally driven second sun gear (28) and a second internal gear (16) that is rotationally fixed to the first internal gear (16) or is produced as one-piece with said first internal gear.