Nsk Corporation

Hiroya Achiha

Takashi Ogawa

Shoji Noguchi

Yasuhisa Terada

Takayuki Yatabe

Hisato Yamamoto

Tsuyoshi Koshi

Shinichi Natsumeda

Ryoichi Otaki

An outer ringis formed so as to have a large thickness and the pitch circle diameters Dp of ballsare shifted to the inside diameter side of the present ball bearing. The radiuses of curvature Ro, Ri of the section shapes of an outer ring racewayand an inner ring racewayare increased with respect to the diameter Db of the balls. At the same time, the diameter Db of the ballsand the thickness of an inner ringare not set excessively small to thereby be able not only to prevent Brinell impressions from being formed in the outer ring racewaybut also to prevent the inner ringfrom being damaged or cracked.

Ball bearing

An outer ring is formed so as to have a large thickness and the pitch circle diameters Dp of balls are shifted to the inside diameter side of the present ball bearing. The radiuses of curvature Ro, Ri of the section shapes of an outer ring raceway and an inner ring raceway are increased with respect to the diameter Db of the balls . At the same time, the diameter Db of the balls and the thickness of an inner ring are not set excessively small to thereby be able not only to prevent Brinell impressions from being formed in the outer ring raceway but also to prevent the inner ring from being damaged or cracked.

The present invention provides a traction coefficient measurement device having a driving roller rotated around a driving shaft, a driven shaft is rotated together with a driven shaft, corresponding to the rotation of the driving roller, based on the engagement with the driving roller, and a load device for applying a resistance to the driven shaft against the rotation, wherein the driving shaft is fixed in position and the driven shaft is supported so as to move to and from the driving shaft, and a press apparatus is used to force the driven shaft to the driving shaft for measurement operation, and the driven shaft is positioned lower than the driving shaft in height, and the traction force acting on the engagement portion between the driving roller and the driven roller is directed in a direction to push the driven shaft downward.

Traction coefficient measurement device

An outer ring is formed so as to have a large thickness and the pitch circle diameters Dp of balls are shifted to the inside diameter side of the present ball bearing. The radiuses of curvature Ro, Ri of the section shapes of an outer ring raceway and an inner ring raceway are increased with respect to the diameter Db of the balls At the same time, the diameter Db of the balls and the thickness of an inner ring are not set excessively small to thereby be able not only to prevent Brinell impressions from being formed in the outer ring raceway but also to prevent the inner ring from being damaged or cracked.

Growing community of inventors

Kanagawa, Japan

Hiroya Achiha