Wiper Arm Head Assembly With Simplified Washer Fluid Routing
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Solution Overview
Problem
Existing wiper devices for motor vehicles require complex definitions of liquid circulation channels within drive shafts, complicating the supply of cleaning liquid.
Innovation Solution
A wiper device with a simplified liquid circulation channel design, where the channel extends through the drive motor housing and wiper arm head, using circumferential seals to maintain sealing and prevent corrosion, allowing for easier definition and assembly without the need for liquid passage through the drive shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the liquid circulation channel is defined inside the drive shaft, then the cleaning liquid can be supplied to the spray device, but the definition of the channel becomes complex
Solution Approach 1:
The liquid circulation channel is extracted from the drive shaft and relocated to the housing and head assembly. The channel now extends through the housing and head rather than through the drive shaft, simplifying the drive shaft structure while maintaining cleaning liquid supply functionality
Solution Approach 2:
The liquid circulation system is segmented into distinct components: the channel extends through the housing, connects to the head, and then to the spray device. This segmentation allows each component to be optimized independently, with the housing providing structural support and the head providing spray functionality
2Reliability
If the drive shaft contains the liquid circulation channel, then the cleaning liquid can be delivered, but the risk of corrosion increases
Solution Approach 1:
The liquid circulation channel is extracted from the drive shaft to eliminate the corrosion risk associated with having liquid passages through the metallic drive shaft. The channel is instead formed in the housing and head, which are designed to accommodate liquid flow without corrosion concerns
3Ease of manufacture
If the head and housing are pushed together through the boundary between dry zone and outside, then modular assembly is achieved, but sealing requirements increase
Solution Approach 1:
The head is nested within the housing, with the head being pushed into the housing through the boundary between the dry zone and the outside. This nested arrangement allows modular assembly while maintaining a compact structure, with the housing providing protection and the head providing spray functionality
Solution Approach 2:
The housing serves multiple functions: it provides structural support, acts as part of the liquid circulation channel, and provides sealing through its interface with the head. The head similarly serves multiple functions including housing the spray device and forming part of the liquid circulation path
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 definition of the liquid circulation channel, reduces the risk of corrosion, and facilitates effective cleaning while minimizing manufacturing and assembly costs, with modular components and improved sealing.
Implementation Method 1
the cavity being sealed by inner and outer circumferential seals between the head and the housing
Implementation Method 2
a seal between the head and the housing is in a groove of the head or of the housing and is pressed against the other of the head or of the housing
Implementation Method 3
the seal situated in the groove is toric with a cross section in the shape of an X, D or O
Implementation Method 4
the seal in the recess comprises branches that are articulated to one another and pressed against the head and the housing by the pressure of the cleaning liquid in the circumferential cavity
Data Source
AI summary
The invention proposes a wiper device for wiping a window of a motor vehicle, comprising a head of a wiper arm, a housing of a drive motor for driving the head of the wiper arm, a circulation channel for circulating cleaning liquid to the wiper, extending through the drive motor housing and the head of the wiper arm. The device enables a simpler definition of the liquid circulation channel.