Conical Primary-Lip Wiper Unit for Low-Friction Rod Cleaning

The patent applies local quality by creating a conical taper specifically at the primary lip of the primary wiper, while the rest of the wiper structure maintains uniform properties. This localized conical geometry concentrates the cleaning action at the leading edge where it is most needed, allowing effective ice and dirt removal without requiring excessive axial length throughout the entire wiper unit, thus avoiding excessive friction.

The patent changes the geometric parameter of the primary lip from cylindrical to conical taper. This parameter change allows the sealing function to be achieved through the conical geometry itself, which naturally generates sealing force through the wedge effect during retraction, rather than relying solely on high preloading forces that would harm tribological characteristics.

The patent segments the wiper unit into distinct functional zones: the primary wiper with conical taper for ice and coarse dirt removal, and the secondary wiper for fine cleaning and sealing. This segmentation allows each component to be optimized for its specific function, achieving superior cleaning performance in harsh environments while maintaining reasonable structural simplicity through the use of only two main wiper elements.