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2 Applied Mechanics and Engineering

2 1999

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Measurement of ball motion in a ball-type limited slip differential gear

Takenouchi K., Fuji T., Takeyari T., Watanabe N., Iwama A., Kawakita K.

Applied Mechanics and Engineering

1999

Vol. 4, no spec.

321-328

Measurement of ball motion in a new-type limited slip differential gear for automobiles is carried out, differential gear which is under development by Hitachi Metals, Ltd. based on a new principle with steel balls and races having an ad-hoc configured race pattern. One ball in the differential gear is magnetized and the direction of magnetic axis rotating with the ball is traced by Hall sensors assembled in orthogonal three axes around the ball. Output signals from the sensors are plotted in orthogonal projections to the three axes, offering a clear understanding of the ball motion. Expressions for calculating the angular velocity components of ball motion are deduced and the ball motion is numerically analyzed from the data obtained in the measurement. The results demonstrate complicated ball behaviors, which include important information on slip between the ball and the groove surfaces affecting the durability and life of the system.

Experimental study on ball motions in thrust ball bearings

Fuji T., Takenouchi K., Ariyoshi S., Kawakita K.

Applied Mechanics and Engineering

1999

Vol. 4, no spec.

311-316

An experimental apparatus and measuring system has been developed for the measurement of actual ball motions in thrust ball bearings. In the apparatus, a representative point on the ball, a magnetic pole of a magnetized ball, is traced by Hall elements arranged on the orthogonal three axes. With the apparatus, an experimental investigation of ball motions in the thrust ball bearing #51308 was carried out under various axial load conditions. Experimental results were plotted in space and projected onto a plane, illustrating a clear view of ball motions. Ball behavior in operation under various load conditions were compared each other and discussed from the viewpoint of stability of ball rotation. It was inferred that the ball rotary axis was not constant at low axial loads below 149N and it was almost constantly pointing radially at axial loads over 149N. The results demonstrated complicated ball motions under low loads, offering fundamental knowledge on the minimum axial load required for the ball without generating slip and slide.