Jtekt Corporation

Koji Kawaguchi

Hiroki Matsuyama

Yuzuru Takahashi

Kiyoshi Ogino

Kazutoshi Toda

Hirofumi Dodoro

Hiroyuki Chiba

Masahiro Harada

Koichiro Mizuno

Tomotaka Nakagawa

Takeshi Sato

Hiroki; Matsuyama

A tapered roller bearing according to the present invention, in which the rolling surface of a tapered roller and raceway surfaces of internal and outer rings undergoes crowning. The total crowning amount of that crowning and the crowning amount of each raceway surface and rolling surface are set to preferred values. This allows reduction of the rolling friction of the internal and outer rings and the tapered roller, and the rotation torque of the tapered roller bearing according to the present invention.

Tapered roller bearing

A lip portion consists of two cylindrical axial lipsextended in parallel to an axial direction of a sealand in different lengths (a radial lip is obviated). A neckof a cross shaftis formed with a neck slant portiondefined by a conical surface inclined at 45&#xb0; relative to an axis thereof. The two axial lipsare pressed against the neck slant portion in the axial direction.

Sealing structure and spider joint

A tapered roller bearing is designed to have a roller loading ratio in the range of 0.7 to 0.92 and a ratio of roller length to roller diameter in the range of 1.1 to 1.7 whereby oil agitation loss and rolling viscous resistance are reduced for achieving the reduction of running torque. Crownings are provided which are designed to have an outer-ring crowning parameter (=RCO/LRO) in the range of 30 to 150 and an inner-ring crowning parameter (=RCI/LRI) in the range of 50 to 260, provided that RCO denotes the radius of an outer ring crowning, LRO denotes the raceway length of an outer ring, RCI denotes the radius of an inner ring crowning and LRI denotes the raceway length of an inner ring. Thus, the rolling viscous resistance is reduced for achieving the reduction of running torque.

Tapered roller bearing, a tapered roller bearing assembly and a pinion-shaft supporting assembly using the same

An end faced on an outer side in a radial direction of a small diameter annular portion of a retainer is disposed on an inner side in a radial direction of a pitch conical face of a taper roller and an end face on an inner side in a radial direction of a large diameter annular portion is disposed on an outer side in the radial direction of the pitch conical face. Further, a portion of the small diameter annular portion opposed to a small diameter end face of the taper roller is disposed on the inner side in the radial direction of the pitch conical face and a portion of the large diameter annular portion opposed to a large diameter end face of the taper roller is disposed on the outer side in the radial direction of the pitch conical face.

Taper roller bearing

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Izumi, Japan

Koji Kawaguchi