Nok Corporation

Minebea Mitsumi Inc.

Yuichi Shuto

Yuichi Tarukawa

Kei Sasaki

Takuya Kato

Shohei Yamane

Kazuki Hirota

A method of manufacturing a hub seal is provided. In the method, a lip reaction force F/hub diameter D and a lip surface roughness R are selected from within a designed region, which is a region of the lip reaction force F/hub diameter D and the lip surface roughness R, set in advance on the basis of a value (lip reaction force F/hub diameter D) given by dividing a reaction force F, which is a value of a reaction force of the side lip in an in-use state, by a hub diameter D, which is a value of a diameter of a hub, and the lip surface roughness R, which is a value of a surface roughness of a seal surface of the side lip. The hub seal is designed such that the lip reaction force F/hub diameter D and the lip surface roughness R become the selected lip reaction force F/hub diameter D and lip surface roughness R. The hub seal is manufactured based on the designed hub seal.

Method of manufacturing hub seal

A sealing apparatus includes: an annular reinforcement ring around an axis; and an annular elastic body part around the axis, which is attached to the reinforcement ring and is formed of an elastic body. The elastic body part has: a side lip, an intermediate lip, and a grease lip. A grease as a lubricant is applied to respective inner peripheral side surfaces of the side lip, the intermediate lip, and the grease lip. A thickener of the grease includes no urea-based thickener. In a usage state of the sealing apparatus, a cross sectional area of an inter-lip space enclosed by the side lip, the intermediate lip, and a hub ring is equal to or greater than 3.5 mm.

Sealing apparatus and sealing structure

There are provided a sealing device and a hub bearing that can reduce torque. Pear-skin-like projections and depressions are provided on each of a sliding surface in a lip for foreign object (a side lipand a middle lip) and a sliding surface in a lip for grease. Roughness of the pear-skin-like projections and depressions provided on the sliding surface of the lip for greaseis larger than roughness of the pear-skin-like projections and depressions provided on the sliding surface of the lip for foreign object.

Growing community of inventors

Fukushima, Japan

Yuichi Shuto