. Electric railway journal . SUCCESSIVE POSITIONS OF HELICAL PINION AND GEAR TEETH THROUGH THE CONTACT PERIOD Fig. 1—Tooth 2 just entering contact. Fig. 2—Tooth 2 in contact near center of face. Fig. 3—Tooth 2 just leaving contact. Figs. 4 to 6—Positions of reverse face of gear for tooth posi- tions shown in Figs. 1 to 3 respectively. The A face of Figs. 4to 6 shows the following in of the helixes across the face, the Kface shown in Figs. 1 to 3, being in advance of A as regardsthe helix. the pinion used in spur gear operationhas from thirteen to sixteen teeth. Insuch a pinion for part of the
. Electric railway journal . SUCCESSIVE POSITIONS OF HELICAL PINION AND GEAR TEETH THROUGH THE CONTACT PERIOD Fig. 1—Tooth 2 just entering contact. Fig. 2—Tooth 2 in contact near center of face. Fig. 3—Tooth 2 just leaving contact. Figs. 4 to 6—Positions of reverse face of gear for tooth posi- tions shown in Figs. 1 to 3 respectively. The A face of Figs. 4to 6 shows the following in of the helixes across the face, the Kface shown in Figs. 1 to 3, being in advance of A as regardsthe helix. the pinion used in spur gear operationhas from thirteen to sixteen teeth. Insuch a pinion for part of the time butone tooth is in contact with the cor-responding gear tooth. It picks up itsload across its entire face suddenly. Itmay be considered as a beam fixed atits root and loaded as a cantilever bythe motor torque. The sudden loadapplication produces two deflections,varying with the loading. Spur-toothcontact under load is unavoidably ac-companied by shock and vibration. •Abstract of paper read before Pennsyl-vania
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