• June 21, 2024
  • Shatou, Changan, Dongguan, CN
Gear Types

Common Gear Types

Gear transmission is a common method of transmission used in machines, and its basic structure is composed of two or more gears that mesh with each other. There are many types of gears. The appropriate gear type can achieve different motion and transmission effects, depending on the specific application and design requirements.

Read on to learn about the different types, characteristics and application areas of common gears.

Spur gear

A spur gear is a common mechanical transmission element. It consists of cylindrical gear teeth arranged regularly, and the movement and power are transmitted through the meshing between teeth. Spur gears are widely used in various mechanical equipment, such as automobile engines, industrial robots, etc. It has the advantages of high transmission efficiency, smooth movement, and large transmission torque. The number of teeth, tooth width, gear modulus and other parameters of the spur gear need to be designed according to the required transmission ratio, working conditions, load and other factors.

spur gear
spur gear

Helical gear

Helical gears, also known as bevel gears, are a common type of gear transmission. Compared to spur gears, the rack and pinion of helical gears are oblique to achieve back-and-forth transmission. It consists of a pair of gears with intersecting axes and is often used for angular velocity conversion and steering transmission. The helical gear transmission offers the advantages of large transmission torque, high transmission efficiency, and stable operation, and it is widely used in mechanical equipment, automobiles, aircraft, and other fields.

helical gear
helical gear

Double helical gear

A double helical gear is a common transmission device composed of two helical gear tooth profiles arranged in a 45° cross arrangement. It is characterized by stable transmission, low noise, high transmission torque, and high transmission efficiency. It is usually used for parallel shaft transmission, enabling forward, reverse, and mutual parallel transmission. Double helical gears are widely used in mechanical equipment, automobile transmission systems, and other fields, and offer the advantages of a simple structure and high reliability.

Double Helical Gear
Double Helical Gear

Herringbone gear

A herringbone gear is a type of gear with a herringbone shape. It consists of two intermeshing gears, one with V-shaped teeth and the other with inverted V-shaped teeth, creating the characteristic herringbone shape. The primary advantage of a herringbone gear is its ability to transmit significant torque, exhibit high transmission efficiency and good load resistance. Thanks to their unique shape, herringbone gears are commonly utilized in gearboxes, primarily those requiring high torque transfer capability.

Herringbone gear
Herringbone gear

Bevel gear

A bevel gear is a commonly used gear transmission system that efficiently transmits motion and power between conical teeth on a conical surface and a flat or spur gear tooth surface. It facilitates the conversion of speed and torque of a driveshaft to a different value on another shaft, leading to adjustment of the transmission ratio and steering. Bevel gears find usage in automobiles, ships, construction machinery, and other fields owing to their compact structure, efficient transmission, and stability.

Bevel Gear
Bevel Gear

Worm gear

A worm gear is a transmission that consists of cylindrical or bevel gears and a worm. It uses the helical groove of the worm and the gear groove of the worm gear to mesh with each other to achieve power transmission and speed reduction. Worm gears have the characteristics of a large transmission ratio, a compact structure, and stable transmission. They are often used in the transmission system of heavy machinery and equipment, such as cranes and vehicle transmissions. Additionally, due to the large meshing angle between the worm and the worm wheel, the worm wheel has a greater self-locking property. This property can effectively prevent reverse movement, increasing the safety and reliability of the transmission system.

Worm Gear
Worm Gear

Hypoid gear

A hypoid gear is a gear whose curved surface is hypoid. A hybrid is a special surface formed by revolving a hyperbola of revolution around its axis of symmetry. Hypoid gears are often used in transmission systems due to their high transmission efficiency and large torque transmission capacity. Their characteristic is that, when the tooth surface of one gear meshes with the tooth surface of another gear, the moving speed of the contact point is evenly distributed, resulting in stable and reliable transmission. They are suitable for high-speed and high-load working environments.

Hypoid Gear
Hypoid Gear

Planetary gear

The planetary gear is a transmission mechanism composed of the sun gear and multiple planetary gears. The planetary gear is fitted with the sun gear teeth by the internal teeth, and the external teeth are fitted with the internal teeth and are connected with the planet carrier at the same time. The axis of the planetary gear rotates around the center of the sun gear, so that the transmission ratio is stable, and the load can be shared to reduce the impact of the load on the gear. The structure is compact, the transmission ratio is large, and it has the characteristics of low noise and high torque transmission, so it is widely used in various industrial equipment transmission systems.

Planetary gear
Planetary gear

Rack and pinion

Racks and pinions are two commonly found parts in mechanical equipment. A rack is an elongated component with a series of tooth-like protrusions. The pinion is a ring-shaped component with teeth on its edge. They are typically used with gear transmission and are engaged to enable force transmission and object movement. The rack offers the advantages of smooth transmission and high transmission efficiency, making it suitable for controlling large-scale linear motion, while the pinion provides fine rotation control and is ideal for driving rotary motion. Both are widely used in industrial manufacturing, mechanical transmission, and other related fields.

Rack and Pinion Gear
Rack and Pinion Gear

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