Sliding Limit Nut Structure for Stable Telescopic Rod Motion
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Solution Overview
Problem
Existing electric push rods experience unstable telescopic movement due to the large gap between inner and outer tubes, leading to accuracy issues during quick operation.
Innovation Solution
A sliding limit type nut structure with internal threads and chutes on a sliding sleeve is used to convert helical motion into stable linear sliding, combined with a telescopic rod design that includes an outer tube, inner tube, and lead screw connected by this nut, ensuring stable and faster telescopic motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a nut is directly connected to a lead screw in a threading manner to drive an inner tube to slide axially along an outer tube, then the structure is simple, but the telescopic movement becomes unstable when the electric push rod works quickly due to long inner and outer tubes and a large gap between them
Solution Approach 1:
The nut is divided into two functional parts: a threaded portion that engages with the lead screw for axial movement, and a sliding portion with chutes that slides within the outer tube. This segmentation allows each part to perform its specific function optimally - the threaded portion provides drive motion while the sliding portion with chutes provides guidance and stability, resolving the contradiction between structural simplicity and telescopic movement stability.
2Length of moving object
If the inner tube is made long to achieve the required stroke length, then the travel distance is sufficient, but the telescopic movement becomes unstable during quick operation
Solution Approach 1:
The sliding portion with chutes acts as an intermediary between the inner tube and outer tube. It provides continuous contact and guidance along the axial direction, stabilizing the telescopic movement during quick operation. The chutes engage with corresponding features on the outer tube to prevent lateral deviation and ensure stable linear motion, allowing the inner tube to maintain its required length without compromising stability.
3Length of moving object
If the gap between the end of the inner tube and the outer tube is increased to accommodate the long stroke, then the stroke length is sufficient, but the motion accuracy deteriorates during quick operation
Solution Approach 1:
The sliding portion with chutes serves as a mediator that maintains motion accuracy throughout the entire stroke length. The chutes provide continuous guidance and constraint on the inner tube's movement, ensuring that even over long distances and at high speeds, the telescopic motion remains accurate and stable. This intermediary structure eliminates the trade-off between stroke length and motion accuracy.
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
The solution stabilizes the linear sliding motion of the inner tube within the outer tube, enhancing the accuracy and speed of the electric push rod's telescopic action.
Implementation Method 1
an inner wall of the sliding contact assembly is provided with internal threads, one end of the sliding contact assembly is provided with external threads
Implementation Method 2
an outer wall of the sliding sleeve is provided with a plurality of chutes, and each of the chutes is arranged in an axial direction of the sliding sleeve
Data Source
AI summary
The present invention belongs to the technical field of electric push rods, and specifically discloses a sliding limit type nut structure, a telescopic rod and an electric push rod. The sliding limit type nut structure includes a sliding contact assembly, where an inner wall of the sliding contact assembly is provided with internal threads, both ends of the sliding contact assembly are provided with external threads and a sliding sleeve, respectively, and an outer wall of the sliding sleeve is provided with chutes. According to the present invention, the internal threads of the sliding contact assembly and the chutes on the sliding sleeve are used to convert a helical motion into stable linear sliding, which makes the motion process more stable.