Spindle Drive Damping Structure for Axial Load Fatigue Control
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Solution Overview
Problem
Existing spindle drives experience premature wear due to uncontrolled tensile loading of damping materials, leading to disruptive noise and reduced service life, as the damping material expands without limitation and fatigues when the adjustment element is manually tensioned.
Innovation Solution
A spindle drive design featuring a connection portion with a coaxial recess and radially peripheral groove, incorporating a damping element with gaps between the flange and groove sides, which limits deformation and fatigue under both tensile and pressure loading, and allows for differential resilience filling to adjust damping characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the damping material is allowed to expand freely in the event of tensile loading, then the damping material can absorb vibrations effectively, but the damping material experiences fatigue and premature wear
Solution Approach 1:
The patent changes the physical state and deformation characteristics of the damping material by confining it within a damping box with a base and walls. The retention portion protruding into the damping material creates a mechanical constraint that limits expansion in the radial direction, thereby controlling the deformation parameters under tensile loading conditions
Solution Approach 2:
The damping box acts as an intermediary structure between the connection portion and the damping material. It provides a controlled environment that mediates the interaction between tensile loads and the damping material, preventing direct uncontrolled expansion while maintaining vibration damping functionality
2Reliability
If the damping material is confined in a damping box with a retention portion, then the damping material is protected from uncontrolled deformation, but the structure becomes more complex
Solution Approach 1:
The damping box is integrated directly into the connection portion, merging the damping containment function with the existing connection structure. The retention portion is formed as part of the connection portion geometry, combining multiple functions into a single integrated component rather than separate parts
Solution Approach 2:
The damping box walls and base are designed as thin-walled structures that provide necessary containment while minimizing material usage and structural complexity. The thin-walled design allows the damping material to deform within controlled limits while maintaining the overall simplicity of the connection portion
3Reliability
If the gaps between the flange and groove side walls are filled with damping material, then the damping capacity is increased, but the structural size increases
Solution Approach 1:
The damping material is placed locally in the gaps between the flange and groove side walls only where vibration transmission occurs. This localized damping approach provides effective vibration insulation without filling the entire connection volume, thereby maintaining compact dimensions while achieving sufficient damping capacity
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 design effectively insulates vibrations, prevents buckling, and extends the service life of the spindle drive by limiting axial deformation and material fatigue, while maintaining a compact structure and simple assembly.
Implementation Method 1
the vibrations which are produced during operation of the spindle drive are intended to be insulated and consequently a transmission to the adjustment element is intended to be prevented
Implementation Method 2
a deformation of the damping element occurs both in the event of tensile and pressure loading
Data Source
AI summary
A spindle drive for a motorized adjustment of an adjustment element of a motor vehicle includes a tubular or half-shell-like spindle drive housing. An annular or disk-like connection portion is inserted and secured in one end region of the spindle drive housing. The annular or disk-like connection portion is connected via a damping element comprising a resilient damping material to a connection for discharging axial drive movements. The connection portion has a coaxial recess with an inner radially peripheral wall having a radially peripheral groove. The connection with the end region thereof facing the spindle drive housing protrudes axially into the recess of the connection portion and has a radially peripheral flange which protrudes radially into the groove. The damping element is arranged in a gap disposed between the side walls of the groove and the side walls of the flange.