Spindle Drive Support Sleeve Axial Displacement
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Solution Overview
Problem
Existing spindle drives for motor vehicle closure elements face challenges in optimizing installation space and mechanical stability, particularly in the axial region around the spindle nut, due to the need for overlapping sleeves which increase radial dimensions and weight.
Innovation Solution
A support sleeve is designed to axially displace and reinforce the spindle nut region during drive movement, eliminating the need for overlapping sleeves, thereby reducing radial dimensions and weight, and enhancing buckling resistance without an outer housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If overlapping sleeves are used to reinforce the axial region around the spindle nut, then mechanical stability and buckling resistance are improved, but radial dimensions and weight increase
Solution Approach 1:
The support sleeve is designed to be axially displaceable relative to the drive connections during drive movement. This dynamic positioning allows the sleeve to provide reinforcement only when and where needed during operation, eliminating the need for permanent overlapping sleeves that would increase weight and radial dimensions continuously.
Solution Approach 2:
Instead of using overlapping sleeves in the radial direction to achieve buckling resistance, the invention transitions to axial displacement of a single support sleeve. This dimensional shift from radial stacking to axial movement provides the same mechanical stability without increasing radial dimensions or weight.
2Stability of the object's composition
If overlapping sleeves are used to reinforce the axial region, then mechanical stability is improved, but installation space increases
Solution Approach 1:
The dynamic axial displacement of the support sleeve during drive movement allows a single sleeve to provide continuous reinforcement along the axial region, replacing the need for multiple static overlapping sleeves that would occupy more radial space and require larger installation area.
Solution Approach 2:
The invention merges the functions of multiple overlapping sleeves into a single support sleeve that achieves the same mechanical stability through axial displacement. This consolidation reduces the overall installation space required while maintaining reinforcement effectiveness.
3Strength
If each drive connection is assigned its own fixed sleeve, then axial support is provided, but the axial region requires larger dimensions to accommodate overlapping sleeves
Solution Approach 1:
The single support sleeve is designed to serve both drive connections universally through its axial displacement capability. Instead of requiring separate fixed sleeves for each drive connection, one multi-functional sleeve moves axially to provide support relative to both connections during drive movement, reducing the overall axial dimension required.
Data Source
AI summary
A spindle drive for a closure element of a motor vehicle. The spindle drive including a drive unit and a spindle-spindle nut transmission and including a spindle and a spindle unit for generating drive movements. The spindle drive including first and second drive sections, including first and second drive connections and configured to move relative to another between a retracted state and mi extended state over an adjustment path along a longitudinal axis of the drive unit. The spindle disposed in the second drive section and is axially fixed relative to the first drive connection, and the spindle nut is disposed in the first drive section and is axially fixed relative to the second drive connection. The spindle drive includes a support sleeve radially surrounding the spindle nut in the extended state and is mounted such that the spindle nut is axially moved relative to the two drive connections.