11. Spur gears are excellent at moderate speeds but tend to be noisy at high speeds.12. Spur gears make a characteristic whine at high speeds.13. It applies to spur gears , parallel axis or crossed axis helical gears, and worm gearing. 14. From Aug . 96 through Jan . 98 there have been 22 spur gear related mishaps. 15. The remaining length of a given pinion meshes with the nearer spur gear on its axle. 16. Sliding spur gears offered forward speeds of 1.5, 3, 5 and 8 mph, and a reverse. 17. The last spur gear has a small pinion gear on its underside, engaging the axle's crown gear. 18. A spur-gear differential has two equal-sized spur gears , one for each half-shaft, with a space between them. 19. In spur gears , teeth suddenly meet at a line contact across their entire width causing stress and noise. 20. They used similar mechanisms to transmit power from the engine to the wheels, typically large, exposed spur gears .
