The main types and characteristics of gear transmission

The main types and characteristics of gear transmission

Gear transmission: Gear transmission is achieved by driving the driven gear in turn to drive the driven gear. One of its basic requirements is that the ratio of its instantaneous angular velocity must remain unchanged. Classification of gear transmission: There are many types of gear transmission. According to the relative motion of two gear transmission is plane motion or space motion, it can be divided into two categories: plane gear transmission and space gear transmission.

The initial contact point of the spur gear tooth is the line that stretches across the entire tooth surface. The initial contact of the helical gear teeth is a point, and when the teeth enter more mesh, it becomes a line. In spur gears, the contact is parallel to the axis of rotation. In helical gears, this line is the diagonal across the tooth flank.

It is a gear that gradually meshes and smoothly transfers motion from one tooth to another, so that the helical gear has the ability to smoothly transfer motion under high-speed 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 herringbone gear.

Double helical gears (herringbone gears) are equivalent to two helical gears mounted on the same shaft side by side in reverse. They produce the opposite axial thrust effect, which eliminates the axial thrust. When two or more unidirectional helical gears are on the same shaft, the tooth direction of the gear should be selected so as to generate a small axial thrust.

Gear transmission is achieved by driving the driven gear in turn to drive the driven gear. One of its basic requirements is that its instantaneous angular velocity ratio must remain unchanged.

Classification of gear transmission: gear transmission is used to transmit 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. It can be divided into plane gear transmission and space gear transmission. .

(1) Types of plane gear transmission: plane gear transmission is used for transmission between two parallel shafts. Common types include spur gear transmission, helical gear transmission and herringbone gear transmission. According to the tooth direction, the plane gear transmission can also be divided into external meshing, internal meshing and the meshing of the gear and the rack.

(2) Types of space gear transmission: Space gear transmission is used for transmission between two intersecting shafts or two intersecting shafts. Common types include bevel gear transmission, intersecting shaft helical gear (helical gear) transmission, etc.

The main characteristics of the gear transmission: the applicable peripheral speed and power range are wide; the transmission ratio is accurate, stable and high in efficiency; the working reliability is high and the life is long; the transmission between the parallel shaft, the intersecting shaft at any angle and the intersecting shaft at any angle can be realized ; Requires higher manufacturing and installation accuracy, and higher cost; not suitable for transmission between two shafts at a long distance.