Yokoyama, H., Otani, A., Shirota, N., and Umezawa, T., "Development of Original Self-Oscillating Washer Nozzle," SAE Int. J. Passeng. Cars - Mech. Syst. 8(1):104-109, 2015, doi:10.4271/2015-01-1377.
As an integral element of automotive wiper systems, an automotive washer system is designed to contribute to the security and safety of automobile-based societies by providing drivers with a clear field of vision. Washer fluid is discharged from washer nozzles, typically mounted on the engine hood, to distances of more than 300 mm across the windshield. However, the fluid discharged may fail to reach targeted areas due to the effects of wind pressure when the vehicle is moving at high speed or due to the increased viscosity of methanol in the washer fluid (at concentrations of 30-60 %) at low temperatures, resulting in failure to ensure a clear field of vision. We developed a self-oscillating washer nozzle to remedy these shortcomings of conventional washer systems. Based on CFD and optimization, the flow passage is designed to generate a stable discharge of washer fluid, even under conditions of high-speed air flow or low temperature. Another point of great concern is the size of the washer nozzle. To avoid adverse effects on automobile design, we sought to develop small nozzles based on the world's smallest flow passages. Additionally, our nozzle can be installed at a wide range of mounting angles, ensuring compatibility with a wide range of vehicles, and is capable of discharging large droplets to maximize wiper system performance. It consumes less washer fluid than conventional systems, contributing to the design of smaller, lighter, and more fuel-efficient vehicles. This new nozzle is produced by our proprietary OSI molding method, previously presented by Mr. Umezawa at the SAE 2009 World Congress & Exhibition and patented in Japan.