Ball Mill Spur Gear & Pinion Shaft
The simplest gears are Spur Gears or straight cut gears. Their teeth protrude radially and are made up of cylinders or discs. At 90 degrees from the shaft length (on the side), check that the gear's tooth surface is straight and parallel to the axis of rotation.
The cross-section of the tooth is generally not triangular when looking down the length of the shaft. To ensure a constant transmission ratio, the sides have a curved shape (typically involute and less frequent cycloid) rather than a straight (triangle) cross-section.
Only after the spur gears were fitted on parallel shafts did they mesh properly. The tooth load produces no axial thrust. Spur gears perform well at middle speeds, although they can be loud at high speeds.
Spur gears have two pressure angles: 20°, which is the current industrial standard, and14½°, which is the former (usually found in old equipment). Spur gear teeth are made using either an involute contour line or a cycloid contour line.
When two gears mesh, the involute component of one of them may come into touch with the non-involute section of the other. When the number of teeth on the smaller two meshing gears is fewer than the necessary minimum, this occurrence is known as "interference."
To avoid interference, undercutting (making the tooth thinner and closer to its base) is occasionally employed, although it is typically ineffective since the reduction in thickness weakens the tooth base. Corrective gears are needed in this situation. The knife rack in the correctional gear may be adjusted up or down.
External and internal spur gears are the two types of spur gears. "External gears" are gears that have teeth on the exterior of the cylinder. Internal gears are gears that have teeth on the inside of the cylinder. The external gear can communicate with either the external or internal gear.
They rotate in opposing directions when the two exterior gears mesh together. Only the internal gear and the exterior gear can mesh, and both gears revolve in the same direction. The internal gear assembly is more compact than the exterior gear assembly due to the shaft's close placement.
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