Gear used by mankind for a long time, a way to communicate the rotational energy is the most common in mechanics.
These mechanisms transmitting motion from one shaft to another, usually with a change in frequency of revolutions per unit time.Engagement means and direct members are either propelling wheel or rack with the cut in their working surfaces of the recesses and protrusions of special shapes.
of two circular elements cooperating in the transfer, one of larger diameter, referred to as a wheel and the other - the pinion, though in fact they are both gears.
depending on whether to put the gearbox problem of increasing the speed of rotation or, conversely, decrease, or is leading wheel or pinion.
Modern construction materials can create gears capable of successfully transforming power of up to 36 million watts.
Requirements mechanisms are different, so the diversity of gears is very large.The axis of rotation can be parallel or intersecting skew, according to a substantially cylindrical, screw, worm or bevel gears.Especially the latter is the ability to report the rotation shaft at right angles to the drive axle.This feature is often needed in a variety of mechanisms, such as the transfer of mechanical energy from the propeller shaft to the driving wheels of a vehicle is carried out under such a kinematic scheme.
most common bevel gear has straight teeth radial cut (tangential).If the master and slave axis does not intersect, so called hypoid gear.The use of such mechanisms in the design of the rear axle caused by the desire of developers to make lower overall center of gravity of the car to make it more sustainable.
Also spur used and other gears, such as with a spiral thread.
Additionally, bevel gears allow rotation of posts, not only a right, but also almost any other angle, obtuse or acute.
Technology of bevel gears is approximately the same as cylindrical, but has a rather complicated preform shape.It consists of at least two truncated cones with a common large base on the same axis.Form a cone at right angles.Tooth profile clearly visible from the trailing side of the conical wheel, and the tooth width decreases from the periphery to the center.The material is a special production of steel, resistant to wear and very firm.
Profile cutting a line of involute, this form provides the most smooth rotation, even wear and maximum distribution of stress at the time of contact between the teeth.
Gears with variable length form of the profile difficult to produce, and to get them used computer-controlled machines.
