Main types and characteristics of gear transmission
Gear transmission: Gear transmission is achieved by driving the driven gears in turn to move the driven gears. One of the basic requirements is that the instantaneous angular velocity ratio must be kept constant. Classification of gear transmission: There are many types of gear transmission. According to the relative motion of the two gear transmissions as plane or space motion, it can be divided into two categories: plane gear transmission and space gear transmission.
The initial contact of a spur gear tooth is a line that stretches across the entire tooth surface. The initial contact of the helical gear teeth is one point, and as the teeth enter more mesh, it becomes a wire. In a spur gear, the contact is parallel to the axis of rotation. In helical gears, the line is a diagonal line across the tooth surface.
It is the gears gradually meshing and smoothly transferring motion from one tooth to another, so that the helical gear has the ability to smoothly transfer motion under high speed and heavy load. Helical gears subject the shaft bearings to radial and axial forces. When the axial force becomes larger or has some influence due to other reasons, it can make the herringbone gear.
Double helical gears (herringbone gears) are equivalent to two helical gears mounted on the same shaft side by side in opposite directions. They produce the opposite axial thrust effect, which eliminates the axial thrust. When two or more unidirectional helical gears are on the same axis, the tooth direction of the gears should be selected in order to generate small axial thrust.
Gear transmission is achieved by driving the driven gears in turn to move the driven gears. One of the basic requirements is that the instantaneous angular velocity ratio must be kept constant.
Classification of gear transmission: gear transmission is used to transmit the motion and power between any two axes in space. According to the relative motion of two gear transmissions, it is plane motion or space motion. .
(1) Types of flat gear transmission: Flat gear transmission is used for transmission between two parallel shafts. There are three common types: spur gear transmission, helical gear transmission and herringbone gear transmission. According to the tooth direction, flat gear transmission can also be divided into external meshing, internal meshing and meshing of gears and racks.
(2) Types of space gear transmission: Space gear transmission is used for transmission between two intersecting or interleaved shafts. Common types are bevel gear transmission, staggered shaft helical gear (helical gear) transmission, and so on.
The main characteristics of gear transmission: a wide range of applicable peripheral speeds and powers; accurate, stable and efficient transmission ratios; high reliability and long service life; transmission between parallel axes, arbitrary-angle intersection axes and arbitrary-angle staggered axes can be realized ; Requires higher manufacturing and installation accuracy, higher cost; not suitable for transmission between two shafts over long distances.
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