Skewed-Axis Planetary Carrier for High Reduction
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Solution Overview
Problem
Existing planetary gear systems face challenges in achieving precise alignment and easy assembly of planet wheel axles, particularly when the planetary gear axes need to be skewed relative to the carrier axis, leading to increased complexity and cost in manufacturing and installation.
Innovation Solution
A planetary carrier design with a tubular base body and bearing sections that allow for skew alignment of planet wheel axles, featuring accessible bearing sections and separate fixing means for easy assembly, along with channel-shaped depressions for axial support and snap-in contours for secure attachment, enabling simplified assembly and reduced noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional planetary gear systems are used with parallel axes, then the structure is simple and manufacturing is easier, but the gear ratio is limited and cannot achieve high reduction ratios in single-stage configurations
Solution Approach 1:
The patent applies asymmetry by skewing the planetary gear axes relative to the carrier axis, transitioning from conventional parallel-axis configurations to a skewed-axis worm-planetary gearbox. This asymmetric arrangement enables high reduction ratios in a single stage while maintaining structural efficiency, resolving the contradiction between structural simplicity and gear ratio capability.
2Productivity
If planet gear axes are skewed relative to carrier axis, then high reduction ratios are achieved, but precise alignment and mounting become difficult and costly
Solution Approach 1:
The planet carrier is segmented into a tubular base body with integrated bearing sections that are separately manufacturable. This segmentation allows the bearing sections to be precisely positioned and secured within the base body, enabling accurate alignment of skewed planet gear axes while simplifying the manufacturing process and reducing costs.
Solution Approach 2:
The patent introduces bearing sections as intermediary components that mediate between the skewed planet gear axes and the carrier axis. These bearing sections facilitate precise alignment and secure mounting, resolving the alignment difficulties associated with skewed axes while maintaining the high reduction ratio capability.
3Ease of manufacture
If integrated planet carrier and axle design is used, then manufacturing is simplified, but accessibility for assembly and maintenance is reduced
Solution Approach 1:
The planet carrier is divided into a tubular base body and separately manufacturable bearing sections. This segmentation maintains manufacturing simplicity while improving assembly accessibility, as the bearing sections can be independently assembled and maintained without disassembling the entire carrier structure.
Solution Approach 2:
The bearing sections are positioned within the tubular base body, utilizing the internal dimensional space of the carrier. This three-dimensional arrangement maintains a compact integrated structure while providing accessible pathways for assembly and maintenance operations.
Data Source
Figure 1a~1c
Figure 2a~2c
Figure 3a~3c
AI summary
The present invention relates to a planet carrier for mounting at least one helical planetary gear (26) in a helical planetary gear for an adjusting device for adjusting two mutually adjustable components, wherein the helical planetary gear (26) has a planetary gear shaft (28) comprising a first shaft section (29) projecting beyond the helical planetary gear (26) and a second shaft section (31) projecting beyond the helical planetary gear (26), and the planet carrier (10) has a tubular base body (12) defining a planet carrier shaft (AP), at least one opening (24) arranged in and penetrating the base body (12), a first bearing section (33) extending from the opening (24), and a second bearing section (35) extending from the opening (24), wherein the first and second bearing sections (33, 35) are rotatably mounted to receive the first and second shaft sections (29, 35).31) are designed and arranged such that the planet gear axis (28) is skew to the planet carrier axis (AP) when the axis sections (29, 31) are received in the bearing sections (33, 35), and the planet carrier comprises a first fixing means (32) connected to the base body (12) for fixing the first axis section (29) in the base body (12). Furthermore, the invention relates to a helical planetary gear (58) with such a planet carrier and to a motor-gearbox unit (56) with such a helical planetary gear (58).