Motor Vehicle Wiper with Movable Motor Assembly
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Solution Overview
Problem
Conventional motor vehicle rear window wiper systems with a single blade typically have a limited wiping zone due to a circular trajectory, which does not efficiently cover the area compared to multiple blades used on front windshields.
Innovation Solution
A device that converts a rotary drive shaft's alternating rotational movement into a translational movement of the motor assembly, allowing the wiper blade to follow an elliptical trajectory with its center of rotation moving along a longitudinal axis, increasing the wiping zone without adding more blades. This is achieved through a pinion-rack assembly and translational guiding means, including a carriage and rail, ensuring smooth and regular movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single wiper blade is used with circular trajectory, then the device complexity is reduced, but the wiping zone area is limited
Solution Approach 1:
The patent applies the dynamics principle by transforming the static circular trajectory into a dynamic elliptical trajectory. The motor assembly is made movable along a rail, allowing the center of rotation to shift position during operation. This dynamic adjustment enables a single blade to cover a larger wiping zone (elliptical area) without increasing device complexity, as the movement is achieved through the existing pinion-rack mechanism rather than adding multiple blades.
2Area of stationary object
If multiple wiper blades are used in parallel, then the wiping zone area is increased, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the wiping function into two components: a single wiper blade for cleaning and a movable motor assembly for trajectory control. Instead of using multiple blades in parallel, the system segments the motion control function, allowing one blade to achieve multi-zone coverage through the shifted circular trajectory created by the movable motor assembly along the rail.
3Area of stationary object
If the motor assembly is made movable to create elliptical trajectory, then the wiping zone area is enlarged, but the device complexity increases
Solution Approach 1:
The patent applies multi-functionality by designing the motor assembly to serve dual purposes: driving the wiper blade rotation and simultaneously moving along the rail to adjust the trajectory. The pinion-rack mechanism serves both as a drive mechanism for the blade and as a guide for the motor assembly's translational movement. This universal design enables elliptical trajectory and enlarged wiping zone without proportionally increasing device complexity.
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 effectively enlarges the wiping zone of a single wiper blade to match the coverage of multiple blades, providing better window cleaning efficiency without increasing the number of wiper blades, ensuring a regular and jerk-free operation.
Implementation Method 1
the means for transforming a rotational movement into a translational movement are formed by a pinion-rack assembly, in particular with straight teeth. The drive shaft bears the pinion, whereas the rack is fixed relative to the window to be wiped.
Data Source
AI summary
The invention relates to a device (2) for wiping a window of a motor vehicle, comprising a wiper blade (4) rotated by a drive shaft (6) which is arranged at the output of a motor assembly (8) capable of creating an alternating rotational movement of said drive shaft. The wiping device also comprises means for translating the motor assembly, and some of said drive means are supported by the drive shaft. In this way, it is the rotation of the drive shaft that translates the motor assembly. The invention also relates to a motor vehicle comprising such a wiping device and to a structural element, in particular a boot door, to which the device is attached.