Belt Tensioner Bow Spring Axial Overlap
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Solution Overview
Problem
Existing belt tensioners with annularly closed tensioning arms often require additional axial installation space and compromise on spring capacity or geometry, limiting their compactness and efficiency.
Innovation Solution
A bow spring is clamped between one wall and a driver of a tensioning arm, allowing for complete or almost complete axial overlap with tensioning rollers in the wrap-around region of the generator pulley, combining high form utilization with restricted arcuate installation space, using a bow spring with a compression spring and annularly closed tensioning arms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a torsion spring is used to enclose the generator shaft, then the spring can provide tensioning force, but additional axial installation space is required
Solution Approach 1:
The patent changes the spring type from a torsion spring to a compression spring (bow spring), fundamentally altering the spring's operational parameters and mounting requirements. This parameter change allows the spring to be mounted axially overlapping with the tensioning rollers, eliminating the need for additional axial installation space while maintaining the enclosing geometry around the generator shaft
Solution Approach 2:
The patent transitions from a spring arrangement that extends axially beyond the tensioning rollers to one where the compression spring is mounted in axial overlap with the tensioning rollers. This dimensional repositioning allows the spring to function within the same axial space as the tensioning mechanism, resolving the space conflict
2Length of moving object
If the spring is arranged axially overlapping with tensioning rollers, then axial compactness is achieved, but spring capacity or geometry must be compromised
Solution Approach 1:
The patent employs a compression spring with specifically optimized parameters (arcuate longitudinal extension, predetermined free length, and clamping arrangement) that enables the spring to deliver sufficient tensioning force while maintaining axial overlap with the tensioning rollers. The parameter optimization ensures both compactness and adequate spring capacity are achieved simultaneously
Solution Approach 2:
The patent segments the spring function into distinct components: the bow spring provides the elastic restoring force, the driver provides the mounting interface, and the clamping arrangement secures the spring in position. This segmentation allows each component to be optimized for its specific function while working together to achieve both compactness and spring capacity
3Stability of the object's composition
If annularly closed tensioning arms are used, then favorable bearing effects are achieved, but the spring geometry is restricted
Solution Approach 1:
The patent employs an arcuate bow spring with a curved geometry that complements the annularly closed tensioning arms. The curved shape of the compression spring allows it to fit within the circular cross-section of the tensioning arms while maintaining the favorable bearing effects provided by the annular configuration. The curvature of the spring matches the circular geometry of the tensioning arm assembly
Solution Approach 2:
The patent nests the bow spring within the annularly closed tensioning arms, with the spring positioned in axial overlap with the tensioning rollers and enclosed by the circular cross-section of the tensioning arms. This nested arrangement allows the spring to function within the constrained geometry while maintaining both the bearing stability of the annular arms and the required spring geometry
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
This design achieves a compact and efficient belt tensioner with high spring capacity, minimizing axial distance to the generator housing and reducing moment loads, while maintaining the geometry of annularly closed tensioning arms.
Implementation Method 1
a bow spring, which produces the pre-tensioning force and which is clamped between the tensioning arms in axial overlap with the tensioning rollers
Data Source
AI summary
A belt tensioner, comprising a first and second tensioning arm supported on a generator housing, a first and second tensioning roller attached to the first and second tensioning arms and configured to apply a pre-tensioning force to an auxiliary unit belt drive, and a bow spring clamped between the first and second tensioning arms in axial overlap with the tensioning rollers and configured to produce the pre-tensioning force.