Ntn Corporation

Fumihiro Murakami

Yasuhiko Shimizu

Yasuhiro Shimizu

Masahiko Kataoka

Masanori Ueno

Tsukasa Toyoda

Yoriko Kosaka

Yuuki Ishizaki

An axle bearing device includes an inner ring fixed to an axle of a railway vehicle, an outer ring fixed to a journal box of the railway vehicle, and double row tapered rollers arranged between raceway surfaces of the inner ring and raceway surfaces of the outer ring. An opening portion between the inner ring and the outer ring is sealed by a labyrinth seal including at least one axial labyrinth extending in an axial direction and at least one radial labyrinth extending in a radial direction. At least one of the axial labyrinth and radial labyrinth which form the labyrinth seal is formed between an outer-ring-side sealing member mounted to the outer ring and the inner ring or between the outer-ring-side sealing member mounted to the outer ring and an inner-ring-side sealing member mounted to the inner ring.

Bearing device for axle of railway vehicle

It is desired to prevent generation of negative pressure in a bearing space and to prevent entry of foreign matter such as water into a bearing. The bearing includes an inner race (), an outer race (), rolling elements () disposed between raceways (and) of the inner and outer races and retained by a retainer (), and seal assemblies () provided at the respective ends of the outer race (). Each seal assembly () includes a seal case () fitted on one end of the outer race (), and an oil seal () mounted in the seal case. A check valve () is mounted in the seal case () and allows only a flow of gas from outside the bearing into the bearing space. A filter () is mounted in a flow passage in the check valve and allows passage of gas and prevents passage of liquid and solids.

Sealed rolling bearing

An axle bearing device includes an inner ring fixed to an axle of a railway vehicle, an outer ring fixed to a journal box of the railway vehicle, and double row tapered rollers arranged between raceway surfaces of the inner ring and raceway surfaces of the outer ring. An opening portion between the inner ring and the outer ring is sealed by a labyrinth seal including at least one axial labyrinth extending in an axial direction and at least one radial labyrinth extending in a radial direction. At least one of the at least one axial labyrinth and the at least one radial labyrinth which form the labyrinth seal is formed between an outer-ring-side sealing member mounted to the outer ring and the inner ring or between the outer-ring-side sealing member mounted to the outer ring and an inner-ring-side sealing member mounted to the inner ring.

Growing community of inventors

Kuwana, Japan

Fumihiro Murakami