Vehicle Wiper Device Actuator Mounting and Rotation Restriction
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Solution Overview
Problem
The existing vehicle wiper devices for rear door glasses with hatch windows face issues due to the large and heavy actuator, which increases the operating force required to open and close the glass, potentially leading to impact and breakage, and complicates the power supply structure when mounted on the glass, while also causing the wiper arm to hang down and interfere with the vehicle's appearance.
Innovation Solution
A vehicle wiper device design where the actuator is mounted on the vehicle body with a reciprocating output shaft and a pivot shaft supported by a glass mounting unit, featuring a coupling mechanism with restrictors and elastic members to prevent the wiper arm from hanging down by restricting its rotation within specific angle ranges, ensuring safe operation and aesthetic integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the actuator is mounted on the rear door glass, then the wiper device can be directly mounted on the glass, but the operating force required to open the glass increases and the glass may break due to impact and load
Solution Approach 1:
The actuator is extracted from the rear door glass and mounted on the vehicle body instead. This separates the heavy component from the glass, eliminating the additional operating force and impact load on the glass while maintaining the wiper functionality.
Solution Approach 2:
A coupling mechanism with coupling pins and coupling holes serves as an intermediary between the actuator and the pivot shaft. This allows the actuator to be mounted on the vehicle body while still transmitting driving force to the wiper mechanism when the glass is closed, without requiring direct mounting on the glass.
2Ease of operation
If the actuator is mounted on the rear door glass, then the wiper device can be directly mounted on the glass, but the power supply structure becomes complicated
Solution Approach 1:
The actuator is extracted from the rear door glass and relocated to the vehicle body. This eliminates the need for complex power supply wiring through the glass and simplifies the overall electrical structure by placing the motor in a location with easier access to the vehicle's existing power supply system.
3Reliability
If restrictors are provided to prevent the wiper arm from hanging down, then the wiper arm is restricted beyond the rotation angle range, but the lever may collide with the restrictors due to allowance and component variations
Solution Approach 1:
Elastic members are provided as a cushioning mechanism between the lever and the restrictors. When the lever approaches the restrictors due to component variations or allowance, the elastic members deform to absorb the impact, preventing direct collision and potential damage while still maintaining the rotation restriction function.
4Power
If the actuator is large and heavy, then the wiper device can perform the wiping function, but the operating force required to open the rear door glass increases
Solution Approach 1:
The heavy actuator is extracted from the rear door glass assembly and mounted on the vehicle body. This separation removes the additional weight and operating force requirement from the glass opening operation, while the actuator continues to provide sufficient power for the wiper function through the coupling mechanism.
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 prevents the wiper arm from hanging down, reduces the risk of glass breakage, simplifies the power supply, and maintains the vehicle's appearance by controlling the wiper arm's rotation within defined angles, even with varying forces and component sizes.
Implementation Method 1
A first elastic member arranged at least on one of the restrictor and the second coupling portion. When the hatch window is open, the first elastic member contacts the second coupling portion between the restrictor and the second coupling portion.
Implementation Method 2
A second elastic member arranged at least on one of the restrictor and the second coupling portion. When the hatch window is open, the second elastic member contacts the second coupling portion between the restrictor and the second coupling portion.
Data Source
AI summary
An actuator for rotating an oscillating disk is mounted on a rear door. A pivot shaft provided with a lever is rotatably supported on a rear door glass. The lever is provided with a first elastic portion and second elastic portions. When the rear door glass is open, the first elastic member contacts the lever between the first restrictor and the lever. As a result, the rotation of the lever toward the outside of a first angle range by a first rotational force or less is restricted. The second elastic portion contacts the lever between the first restrictor and the lever even if the lever rotates toward the outside of a second angle range by a rotational force greater than the first rotational force.