helical gears offer a refinement over spur gears. The leading edges of the teeth are not parallel to the axis of rotation, but are set at an angle. Since the gear is curved, this angling causes the tooth shape to be a segment of a helix. The angled teeth engage more gradually than do spur gear teeth. This causes helical gears to run more smoothly and quietly than spur gears. Helical gears can be meshed in a parallel or crossed orientation. The former refers to when the shafts are parallel to each other; this is the most common orientation. In the latter, the shafts are non-parallel. For a crossed configuration the gears must have the same pressure angle and normal pitch, however the helix angle and handedness can be different. The relationship between the two shafts is actually defined by the helix angle(s) of the two shafts and the handedness, as defined: : : Where β is the helix angle for the gear. The crossed configuration is less mechanically sound because there is only a point contact between the gears, whereas in the parallel configuration there is a line contact. Quite commonly helical gears are used with the helix angle of one having the negative of the helix angle of the other; such a pair might also be referred to as having a right-handed helix and a left-handed helix of equal angles. The two equal but opposite angles add to zero: the angle between shafts is zero -- that is, the shafts are parallel. Where the sum or the difference (as described in the equations above) is not zero the shafts are crossed. For shafts crossed at right angles the helix angles are of the same hand because they must add to 90 degrees.
Planetary gears can be spur or helical gears.
Reverse and forward gears
Six gears, one down five up.
Gears working together can be a simple machine in themselvesA Gear Train is a complex machine made up of wheel, axles and gears
Spur gears have straight teeth while helical gears have curved teeth. Generally, helical gears are usually quieter and smoother in operation, while spur gears are easier to make and much less expensive.Helical gears are stronger than spur gears.
gears, gears 2, and gears 3
No they do not have gears
Well in most cars there are 5 gears and the reverse. Don't forget the timing gears, steering gears and differential gears.
5 gears
Camshaft gears are the gears that drive shaft that operates the cams.
There are gears in a blender.
Gears are not in a computer.
a car in in gears
gears of war is the best but gears of war 2 is better
12 forward gears and 4 backward gears
Planetary gears can be spur or helical gears.
The computer has wires and microchips but does not have gears. Do you mean the fan.