Windscreen Wiper Motor Brush Assembly for Precise Carbon Brush Positioning
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Solution Overview
Problem
The existing windscreen wiper motor designs face challenges in efficiently positioning and securing the carbon brush holder plate within the transmission housing, leading to complex structural designs and potential misalignment, which can result in suboptimal contact and increased abrasion during operation.
Innovation Solution
The activation device is integrated into the transmission housing as a component, featuring a contact surface that decreases radially with respect to the carbon brush holder plate's longitudinal axis, allowing for a smooth movement of the spring element and ensuring proper alignment through guide elements and counter-elements, and a curved contact section that can engage both sides of the carbon brush for enhanced force distribution and centering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the activation device is integrated into the transmission housing, then the structural design of the carbon brush holder plate is simplified, but the positioning and alignment requirements become more critical
Solution Approach 1:
The activation device is merged with the transmission housing as an integrated component rather than a separate part. This combining reduces the overall number of components and simplifies the structural design of the carbon brush holder plate, while the transmission housing itself provides the positioning function through its geometry
Solution Approach 2:
The transmission housing serves dual functions: both as a structural enclosure and as an activation device through its geometric features (such as the annular groove and positioning protrusions). The housing's own structure provides the activation and positioning functions without requiring additional dedicated components
2Ease of operation
If the contact surface is designed with decreasing radial distance in assembly direction, then smooth movement of spring element is achieved, but manufacturing complexity increases
Solution Approach 1:
The contact surface is designed with a curved profile (decreasing radial distance) rather than a flat surface. This curvature guides the spring element smoothly during assembly, ensuring proper seating and activation while the curve can be integrated into the housing's overall geometry
3Manufacturing precision
If guide elements and counter-elements are used for positioning, then correct angular positioning is ensured, but device complexity increases
Solution Approach 1:
The guide elements and counter-elements are designed with asymmetric geometries that provide precise angular positioning through their unique shapes. The asymmetric features ensure correct orientation during assembly while being integrated into the overall housing structure
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 simplifies the structural design of the carbon brush holder plate, ensures correct angular positioning, reduces abrasion, and maintains consistent contact pressure, thereby improving the operational efficiency and longevity of the windscreen wiper motor.
Implementation Method 1
a spring element (40) which presses the carbon brush (32) against the collector (18)
Implementation Method 2
the frictional connection of the carbon brush with the side wall of the guide element is removed
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a windscreen wiper motor (10) with a motor housing (56) of an electric motor (14) being connectable with a transmission housing (12), the electric motor (14) comprising an anchor (16) with a collector (18) and a carbon brush holder plate (26) working together with the collector (18), wherein the carbon brush holder plate (26) has a guide element (46) for a carbon brush (32), wherein the carbon brush (32) is arranged in the guide element (46) so as to be longitudinally displaceable in the direction of a longitudinal axis (34) of the carbon brush (32), with a first end surface (36) of the carbon brush (32) which is designed to be in contact with the collector (18), with, opposite the first end surface (36), a second end surface (38), on which, in an operating position, a spring element (40) is in spring-pretensioned contact in order to press the carbon brush (32) in the direction of the collector (18), wherein the spring element (40), when the carbon brush holder plate (26) is assembled, is in spring-pretensioned contact on a side surface (63) of the carbon brush (32) and presses the carbon brush (32) against the guide element (46) forming a frictional connection (65), so that the first end surface (36) of the carbon brush (32) is positioned at a distance from the collector (18) and wherein an activation device (58) is provided which interacts with the second end surface (38) of the carbon brush (32).