Telescopic Rear Wiper Arm with Cam and Roller Mechanism for Increased Wiping Area
To be published on November 21, 2019 by SAE International in United States
Event: NuGen Summit
All round visibility is critical for safety of vehicle and road users. A vehicle must be designed in such a way that the driver encounters minimal hindrance for visibility of vehicle surroundings. This is even more essential during poor visibility conditions like during rain, snow, heavy fog etc. At present, wiper systems play an essential role in providing better visibility. There are other technological aides like cameras, sensors etc., but they must be considered as secondary systems, the must not be relied upon. Current wiper systems for front windscreen are very efficient, in terms of wiping area. But the wiper systems for rear windscreen are starkly opposite. The rear wiper arm length is very low, mainly due to low height of rear windscreen. This combined with the motion of wiper arm in an arc, results in low wiping area, leading to poor visibility through rear mirror. This paper addresses this problem with a simple solution - Telescopic Wiper Arm with Cam and Roller Mechanism. This mechanism can be divided into two parts. First is the telescopic wiper arm. The length of this wiper can be varied. Second part is the cam and roller mechanism. Rotation to the cam is provide by the wiper motor through gear mechanism. This rotational motion of cam is converted to linear motion of wiper with the help of roller. The cam profile is designed such that maximum wiping area is achieved during its operation. In comparison, telescopic wiper arm with cam and roller mechanism is capable of achieving higher wiping area than conventional wiper arm, as the wiper arm motion is not confined to an arc like the conventional wipers. This results in better visibility through rear windscreen during wiper operation.