Wiper Rubber Damping Strip Deformation for Noise Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional wiper blades without retaining clips generate significant noise during the folding motion at the movement reversal point due to insufficient noise damping, particularly in longer blades, as the impact of the lower part's longitudinal edge on the upper part is not adequately absorbed.
Innovation Solution
The squeegee design features extended damping strips between the upper and lower parts, forming a larger deformation space that allows for increased energy absorption, preventing the upper edge from hitting the lower surface and instead deforming against the damping strips, which are further deformed into a concave depression, effectively reducing impact noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional damping strips are used between the upper part and lower part, then some noise damping is achieved, but the impact noise remains insufficiently damped, particularly in longer wiper blades
Solution Approach 1:
The deformation space is extended in the longitudinal direction (along the wiper blade length) to significantly increase the damping capacity. This dimensional extension allows the damping strip to absorb more impact energy during the folding motion, effectively reducing noise in longer wiper blades where conventional short damping strips are insufficient.
Solution Approach 2:
The deformation space is extended by modifying the geometric parameters of the upper part structure. The deformation space is elongated in the longitudinal direction, changing the physical dimensions available for energy absorption during impact, thereby increasing the damping effectiveness without altering the fundamental damping mechanism.
2Loss of energy
If the deformation space is extended in the direction of the upper part, then the damping strip can absorb more impact energy, but the structural complexity increases
Solution Approach 1:
The upper part structure serves multiple functions: it provides structural support for the wiper blade, creates the extended deformation space for energy absorption, and forms the wind deflector profile for aerodynamic function. By integrating these functions into a single structural element, the complexity is minimized while achieving the energy absorption goal.
Solution Approach 2:
The deformation space extension is integrated directly into the upper part structure rather than being a separate component. The wind deflector profile and the extended deformation space are combined in the same structural element, reducing the total number of parts and simplifying the overall squeegee construction.
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 significantly reduces the impact noise by enhancing the damping capability of the squeegee, allowing it to absorb more impact energy without compromising the flexibility or contact pressure transfer of the wiper blade.
Implementation Method 1
The expansion of the deformation space means that the respective damping strip is much more deformable than in the prior art solution and can therefore absorb more impact energy
Implementation Method 2
the impact of the longitudinal edge of the lower part on the damping strip is damped far more than the prior art solution
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3~4
AI summary
The invention relates to a wiper rubber for the wiper blade of a windscreen wiper, which wiper rubber has an upper part (1) for connection to an elastic supporting element, and a lower part (3), which is connected to the upper part via at least one tilting web (4) and has a wiper lip (6) for bearing against a vehicle window, and damping strips (9) between the upper-part-side longitudinal edges (8) of the lower part and the upper part, wherein the damping strips are arranged at an acute angle to the upper part and form a triangular deformation space with respect to the latter. It solves the problem of designing a wiper rubber of this type in such a manner that the turning-over noises, which are produced when the wiper blade turns over at the particular movement reversal point of the wiper blade, are very substantially eliminated. For this purpose, the deformation space for the particular damping strip (9, 14) is considerably extended in the direction of the upper part (1, 12).