What is bevel gear features and used for?

What is bevel gear features and used for?

Bevel gear is one of the gears and is widely used in various industrial equipment. Let's introduce it below.

Bevel gears are most commonly used for transmission of two vertical shafts, but are also suitable for transmission of two shafts at other angles. The most typical application is to drive a vertical pump with a horizontal drive. The two main differences between bevel gears and spur gears are their shape and their relationship to the shaft. A bevel gear is conical in shape, while a spur gear is originally a cylinder. Bevel gears transmit motion between two angled shafts, i.e. intersecting shafts, while spur gears transmit motion between two parallel shafts.

Features of bevel gears: 

The precision bevel gear is mainly used to realize the transmission of motion and power between two intersecting axes. The intersection angle ∑ of the two axes is called the shaft angle. The value of ∑ can be determined according to the needs of the transmission. Usually, 90 degrees are used, that is, the perpendicular intersection. The teeth of the bevel gear are arranged on the truncated cone. Therefore, the expressions corresponding to the "cylinder" in the cylindrical gear become "cone", such as index cone, pitch cone, base cone, tooth tip cone, etc. ; This is also the origin of the name of the bevel gear.

Main features and functions

There are many mechanical transmission methods used in various machines, the most important ones are belt drive, chain drive, friction wheel drive, gear drive and belt nut drive.

Among them, gear transmission, generally speaking, is to enable one shaft to drive another shaft to rotate when it rotates; or to change the rotary motion of one shaft into linear motion.

Its main features are: the teeth are closely meshed with each other, and the torque transmitted is much larger than that of belt and chain transmission; its transmission efficiency is also higher than that of other mechanical transmissions; and it can be used in a large transmission force. Keep the speed ratio between the two shafts unchanged. There are many types of gears, which are generally divided into cylindrical gears, bevel gears and worm gears according to the shape of the tooth surface. Commonly used spur gears and helical gears are cylindrical gears, which are used to drive the rotational motion of two mutually parallel axes, while bevel gears are used to drive the rotational motion of two intersecting axes. When the teeth of a pair of bevel gears mesh with the transmission, the situation is very similar to the transmission of two semi-truncated conical friction wheels, as shown in Figure 3. However, in the transmission of the friction wheel, if the force driven by the driven shaft is greater than the friction force between the two wheels, the two wheel surfaces will slide, or even a driven wheel cannot be driven. If the friction wheel is made into a toothed wheel, and the force of the teeth on the gear is used to drive the teeth on the other shaft, the rotational force of this shaft can be transmitted to the other shaft, as shown in Figure 4. The meshing transmission of the bevel gear is based on this basis.

Precision Bevel gears have a wide range of uses, especially when two axes intersect, the distance between the two axes is very close, the transmission force is large, and the rotation ratio is fixed, the bevel gear is the most suitable.