Koyo Seiko Company, Ltd.

Jtekt Corporation

Kunio Yanai

Hiroshi Ueno

Hirokazu Arai

Kazuki Hamada

Kazuhisa Kajihara

Masanori Shinohara

Tomoki Uno

Kiyoshi Tanimoto

Motoshi Kawamura

Akira Yamamoto

Masatosi Taniyama

A resin pulley includes an outer cylindrical portion including an outer circumferential surface on which a belt is to be wound, an inner cylindrical portion, and a plurality of ribs connecting an inner circumferential surface of the outer cylindrical portion and an outer circumferential surface of the inner cylindrical portion, which are formed of a resin material. The ribs are provided so as to be inclined towards a circumferential direction relative to a radial imaginary line as viewed in an axial direction. Radially outer end portions of the ribs are formed such that inclination angles of the respective radially outer end portions relative to the radial imaginary line increase as the ribs extend radially outward, and radially inner end portions of the ribs are formed such that inclination angles of the respective radially inner end portions relative to the radial imaginary line increase as the ribs extend radially inward.

Resin pulley

A resin pulley includes: an outer cylindrical portion having an outer circumferential surface on which a belt is to be wound; an inner cylindrical portion which is disposed radially inwards of and concentrically with the outer cylindrical portion; and a plurality of ribs connecting an inner circumferential surface of the outer cylindrical portion and an outer circumferential surface of the inner cylindrical portion. The outer cylindrical portion, the inner cylindrical portion and the ribs are formed integrally from a resin material, and the ribs are provided in such a manner as to be inclined towards a circumferential direction relative to a radial imaginary line as viewed in an axial direction.

A bearing retainer of a synthetic resin, which can be injection molded out of a material obtained by mixing at least particles of a heat resisting reins with a thermoplastic resin, and which can thereby be manufactured at a low cost without compromise in suitability for high-rotational-speed and high-temperature applications.

Bearing retainer of synthetic resin, method of manufacturing the same and rolling bearing

There is provided a bearing sealing device capable of substantially completely preventing a leak of grease. A taper end portion of an axial extension of the bearing sealing device has an opposite surface and a rake face that forms a specified rake angle with the opposite surface. The opposite surface forms a narrow passage between the opposite surface and an outer peripheral surface of an inner ring. The narrow passage allows air to pass easily, but it allows grease to hardly pass therethrough. Further, the axial extension includes part of a core metal that extends axially and has its foremost end located axially inside an axial outermost end of the outer peripheral surface of the inner ring. Grease moving axially outwardly on the outer peripheral surface is moved along the rake face of the taper end portion and then guided along a cover portion of the bearing sealing device to an outer ring. The part of the core metal prevents the axial extension from being bent radially outwardly by a centrifugal force.

Bearing sealing device and bearing sealing mechanism capable of

A seal assembly interposed annularly between the inner and outer rings of a bearing assembly to seal an annular cavity formed between the inner and outer rings of the bearing assembly, the seal assembly having an annular seal member fitted onto the inner peripheral surface of the outer ring, a first annular seal lip, and a second annular seal lip, the first annular seal lip being in elastic-contact with the sidewall of an annular groove formed in the inner peripheral surface of the inner ring. The first annular seal lip has a radial length and an axial thickness satisfying a ratio (A/B) of the radial length (A) to the axial thickness (B), the ratio (A/B) being in the range of not less than 4.5 and not more than 7.0 to obtain a moderate rigidity capable of following the relative movement of the inner and outer rings. Communicating grooves are formed in the lower end portion of the first annular seal lip for communicating between the inside and outside of the bearing assembly, in order to prevent an increase in pressure within the bearing assembly because of a rise in temperature within the bearing assembly.

Growing community of inventors

Katsuragi, Japan

Kunio Yanai