Two-Stage Worm Drive Layout for Stable Control Valve Rotation
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Solution Overview
Problem
Existing drive devices for control valves face challenges in stably driving the valve core to rotate, particularly due to the limitations in the structure of the transmission assembly which affects the drive performance.
Innovation Solution
The drive device incorporates a transmission assembly with a first-stage worm and a second-stage worm, along with a compact housing design that includes protruding portions to support and limit the worms, ensuring stable rotation of the valve core.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-stage worm drive is used, then the device complexity is reduced, but the drive stability and precision deteriorate
Solution Approach 1:
The transmission assembly is divided into two stages: a first-stage worm drive and a second-stage worm drive. The first-stage worm engages with a first-stage worm gear, and the second-stage worm engages with a second-stage worm gear. This segmentation allows each stage to contribute to the overall stability and precision, resolving the contradiction by maintaining simplicity while improving reliability through functional division.
2Reliability
If a two-stage worm drive is used, then the drive stability is improved, but the device complexity increases
Solution Approach 1:
The first-stage worm and second-stage worm are integrated into a single transmission assembly housed within a common housing. The housing includes integrated support structures (first support structure and second support structure) that simultaneously support both worm stages. This merging approach improves drive stability through dual-stage transmission while minimizing the increase in device complexity by consolidating components.
3Volume of moving object
If the transmission assembly size is reduced, then the compactness is improved, but the manufacturing precision requirements worsen
Solution Approach 1:
The transmission assembly employs a nested configuration where the first-stage worm gear and second-stage worm gear are arranged in a compact, space-efficient manner within the housing. The support structures are integrated into the housing walls, creating a nested layout that reduces overall volume. This nesting approach achieves compactness while the precise geometric design of the worm and gear interfaces maintains manufacturing precision requirements.
Data Source
AI summary
A drive device includes a housing, a motor and a transmission assembly; the housing includes a first casing and a second casing; the first casing includes a first protruding portion and a second protruding portion; the second casing includes a third protruding portion; the transmission assembly includes a first-stage worm, a second-stage worm and a transmission wheel; the first-stage worm includes a first tooth-shaped portion; the second-stage worm includes a second tooth-shaped portion; the first protruding portion and the second protruding portion both limitedly cooperate with the second-stage worm; along the axial direction of the second tooth-shaped portion, the first protruding portion is located on one side of the second tooth-shaped portion; the second protruding portion is located on the other side of the second tooth-shaped portion; and the distance between the third protruding portion and the transmission wheel is within a preset range.