Rear Wiper Stop Structure for Roof Collision Prevention
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Solution Overview
Problem
Rear wipers on vehicles are prone to damage during car washing and risk collision with the roof when mounted on the top of the rear windshield due to inadequate angle limitation, and existing solutions with rubber elements are inefficient and require additional assembly, increasing costs and time.
Innovation Solution
A rear wiper design with a stop part on the wiper arm that limits the rotation angle by abutting against the arm support, using a U-shaped groove and stop components to distribute stress, formed as one piece for enhanced strength and reduced assembly time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If no angle limitation is provided for the wiper arm, then the wiper arm has full rotation freedom for maintenance, but the wiper arm is easily damaged during car washing and may collide with the roof
Solution Approach 1:
The patent applies local quality by providing angle limitation only at specific positions (when the wiper arm is in the horizontal or upward state) while maintaining full rotation freedom when the wiper arm is in the downward wiping position. The stop part is strategically positioned to limit rotation only when necessary, allowing the wiper arm to move freely during normal operation and maintenance when safety concerns are minimal.
2Reliability
If a rubber element is added to limit the wiper arm angle, then some angle limitation is provided, but the rubber part has low elastic strength and cannot effectively limit the lifting angle
Solution Approach 1:
The patent replaces the durable but weak rubber element with a stop part made from the wiper arm's own structural components (first connecting end or second connecting end), which are inherently stronger and more rigid. This effectively substitutes a weak limiting component with a stronger structural element that provides reliable angle limitation without compromising the wiper arm's strength.
3Reliability
If additional components are added to limit the wiper arm rotation angle, then angle limitation is achieved, but production and assembly time increases and costs rise
Solution Approach 1:
The patent merges the angle limitation function with the existing wiper arm structure by making the stop part an integral component of either the first connecting end or second connecting end. This integration eliminates the need for separate limiting components, reducing part count and assembly steps while maintaining effective angle limitation functionality.
Solution Approach 2:
The stop part serves multiple functions: it acts as both a structural component of the wiper arm and an angle limitation device. By giving the stop part this dual functionality, the patent eliminates the need for dedicated limiting components, thereby reducing production complexity and assembly time while achieving reliable angle limitation.
4Shape
If the wiper arm is mounted on the top of the rear windshield, then aesthetic appearance is improved, but the risk of collision with the roof increases when manually lifting the wiper arm
Solution Approach 1:
The patent applies preliminary anti-action by providing the stop part that proactively prevents the wiper arm from rotating into positions that would cause collision with the roof. The stop part is positioned to engage before the wiper arm can reach the upward position, thereby preemptively blocking the harmful motion and preventing collision before it can occur.
Data Source
AI summary
The present disclosure provides a rear wiper and a vehicle. The rear wiper includes an arm support, having a first end portion and a second end portion, wherein the arm support is driven to pivot at the first end portion thereof, such that the rear wiper wipes a rear windshield, and a wiper arm, having a first connecting end, wherein the first connecting end is connected to the second end portion of the arm support, and the wiper arm is rotatable relative to the arm support between a first position close to the rear windshield and a second position away from the rear windshield. The wiper arm includes a stop part, which is located at the first connecting end and is capable of abutting against the arm support, and when the stop part abuts against the arm support, the wiper arm is in the second position.