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The gear ratios in transmission and final drive are important because different gear ratios will change the characteristics of a vehicle's performance. Valve timing gears on a Ford Taunus V4 engine — the small gear is on the crankshaft, the larger gear is on the camshaft. The crankshaft gear has 34 teeth, the camshaft gear has 68 teeth and ...
Profile of a spur gear Notation and numbering for an external gear Notation and numbering for an internal gear. The tooth surface (flank) forms the side of a gear tooth. [1] It is convenient to choose one face of the gear as the reference face and to mark it with the letter “I”. The other non-reference face might be termed face “II”.
An even uniform gear wear is achieved by ensuring the tooth counts of the two gears meshing together are relatively prime to each other; this occurs when the greatest common divisor (GCD) of each gear tooth count equals 1, e.g. GCD(16,25)=1; if a 1:1 gear ratio is desired a relatively prime gear may be inserted in between the two gears; this ...
If the sun gear has teeth, and each planet gear has teeth, then the ratio is equal to . For instance, if the sun gear has 24 teeth, and each planet has 16 teeth, then the ratio is − + 24 / 16 , or − + 3 / 2 ; this means that one clockwise turn of the sun gear produces 1.5 counterclockwise turns of each of the planet gear(s ...
Meshing of two spur gears with involute external teeth. z1 = 20, z2 = 50, α = 20°, ξ1 = ξ2 = 0 ISO 53:1998. The lower (green) gear is the driving one. The working (active) part of the line of action is shown in blue, which is the geometric location of all teeth contact points. The contact points are highlighted with bold black dots.
For example, if there are 202 teeth on the circular spline and 200 on the flex spline, the reduction ratio is (200 − 202)/200 = −0.01 Thus the flex spline spins at 1/100 the speed of the wave generator plug and in the opposite direction. Different reduction ratios are set by changing the number of teeth.
Typical gear ratios on bicycles range from very low or light gearing around 20 gear inches (1.6 metres per revolution), via medium gearing around 70 gear inches (5.6 m), to very high or heavy gearing around 125 gear inches (10 m). As in a car, low gearing is for going up hills and high gearing is for going fast.
Drawing showing the tooth and leaf profile of a cycloidal wheel and pinion. A cycloidal gear is a toothed gear with a cycloidal profile. Such gears are used in mechanical clocks and watches, rather than the involute gear form used for most other gears. Cycloidal gears have advantages over involute gears in such applications in being able to be ...