Spur gear is the simplest type of gear which consists of a cylinder or disk. Its form is not straight-sided, thus, the edge of each tooth is straight and aligned parallel to the axis of rotation. It is the most basic and available type.
As the most common type, spur gears are often used because they are the simplest to design and manufacture. Besides, they are the most efficient. Gear teeth could be manufactured with a wide variety of shapes and profiles.
Nowadays, the involute profile is the most commonly used system for gearing. An involute is a curve that is traced by a point on a taut cord unwinding from a circle, which is called a base circle. The involute is a form of spiral, the curvature of which becomes straighter as it is drawn from a base circle and eventually would become a straight line if drawn far enough.
In recent years, it is usual to set the pressure angle to 20 degrees. In commercial machinery, it is most common to use a portion of an involute curve as the tooth profile. Reliable Gears are well known Industrial Gears Manufacturers in Gujarat and Reliable Gears are the Expert Custom Gearbox Manufacturers, Suppliers, Exporter in Gujarat.
Helical gear is also an important type that can be widely applied. For instance, they have improved tooth strength due to the elongated helical wraparound and increased contact ratio due to the axial tooth overlap. Moreover, they also tend to have greater load carrying capacity than spur gears of similar size.
These 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 makes the tooth shape a segment of a helix. Helical gears can be meshed in parallel or crossed orientations.
When helical gears are operated on other than parallel shafts, the tooth load is concentrated at a point, with the result that very small loads produce very high pressures. The sliding velocity is usually quite high and, combined with the concentrated pressure, may cause galling or excessive wear, especially if the teeth are not well lubricated. For these reasons, the tooth load which may be applied to such drives is very limited and of uncertain value, and is perhaps best determined by trial under actual operating conditions. If one of the gears is made of bronze, the contact area and thereby the load carrying capacity, may be increased under loads which gradually increase to the maximum expected.
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