The present paper describes the tooth surface temperature and the power transmission efficiency of plastic sinecurve gears in the running condition. The plastic sine-curve and involute gears were manufactured by injection molding. The running tests for sine-curve and involute gears were performed under no-lubrication and greaselubrication conditions, and the tooth surface temperature and the power transmission efficiency were measured. Test results show that the sine-curve gears for operating condition had lower tooth surface temperatures and higher power transmission efficiencies than involute gears under no-lubrication conditions, but in the greaselubrication condition the superiority of sine-curve gears was not observed.
A computer program has been developed to simulate a gear shaving process. The present paper describes a new cutting model of a shaving process so as to incorporate the effect of a cutting performance of a shaving cutter into the simulation program. This cutting model is constructed on the assumption that an excess depth of cut over a certain criterion yields a material removal from a tooth flank of work gear. In addition, the criterion has no definite value, but its value shows the normal distribution. The mean value of the distribution can define a characteristic of cutting performance of the shaving cutter. A small mean value means that even small depth of cut can cause a stock removal. In other words, the cutter has a good cutting performance. After reliability being confirmed, computer simulations reveal an effect of the cutter performance on shaved tooth form. As a result, a pressure angle error on the shaved tooth profile becomes remarkable as the cutter performance becomes worse. Therefore, the developed computer simulation program is useful for the design of the shaving cutter and judgment of tool life expiring.
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