12

2024

-

01

Gear basics: gear structure and components

Source:

Time:2024-01-12 15:50


Structure of 1. gear

The structure of the gear usually includes three parts: the gear hub, the tooth surface and the rim. Among them, the gear hub is the main body of the gear, which is usually composed of the hub body and the bearing seat; the tooth surface is the key part of the power transmission between the gear and the gear, and its tooth shape and meshing determine the efficiency and smoothness of the gear transmission; The outer diameter of the gear is usually used to improve the rigidity and carrying capacity of the gear.

Components of 2. gears

Gear hub

The gear hub is the main body of the gear, and the choice of its structure and material directly affects the transmission efficiency and service life of the gear. The gear hub usually consists of a hub body and a bearing seat.

The hub body is the main bearing part of the gear and is usually made of cast steel or forged steel. Cast steel gear wheels are usually manufactured by sand casting or gypsum mold casting process, which has the characteristics of low production cost and suitable for mass production; forged steel gear wheels are manufactured by forging process, which has the advantages of high strength and good fatigue resistance.

The bearing seat is a support part on the gear hub to support the bearing and shaft. The bearing seat is usually made of cast iron or cast steel, which has the characteristics of high strength and wear resistance.

tooth surface

The tooth surface is the key part of the gear, and its tooth profile and meshing directly affect the transmission efficiency and stability of the gear. The tooth surface is usually manufactured by gear processing technology, and its processing accuracy determines the accuracy and life of the gear.

Tooth profile is one of the main parameters of the tooth surface, which determines the transmission ratio and torque transmission capacity of the gear. The tooth profile is usually composed of tooth top height, tooth root height, tooth side clearance, tooth top circle radius and other parameters. Different tooth profiles are suitable for different transmission occasions, such as straight teeth, helical teeth, involute teeth, etc.

Meshing is the key link of gear transmission, and its meshing quality determines the stability and life of gear transmission. The meshing quality mainly depends on the machining accuracy of the tooth surface and the control of the meshing gap. Tooth surface machining accuracy is usually achieved through gear machining equipment and process control, and meshing clearance is achieved through the control of axial clearance and radial clearance.

rim

The rim is the outer diameter of the gear, and its function is to improve the rigidity and load-bearing capacity of the gear. The rim is usually realized by thickening or widening, and the design of its thickness and width depends on the working conditions and transmission requirements of the gear. The rim can also be machined in the shape of a rack or boss to increase the carrying capacity of the gear and reduce noise.

Other components of 3. gear

In addition to the gear hub, tooth surface and rim, the gear has some other components, such as bearings, shafts, seals, etc.

Bearing is an important supporting component in gear transmission, its role is to support the gear shaft and reduce the impact of axial force and radial force on the gear. The bearings are usually rolling bearings or sliding bearings, and the choice depends on the working conditions and use requirements of the gear.

The shaft is the part that connects the gear hub and the transmission device in the gear transmission, and its function is to transmit power and bear axial and radial forces. The shaft is usually made of high-quality steel material, and its size and shape are designed according to the working conditions and transmission requirements of the gear.

The seal is an important protective component in gear transmission, and its function is to prevent gear oil leakage and dust from entering the gear. Commonly used seals include bearing seals, oil seals, mudguards, etc.

In short, as a common mechanical transmission element, the structure and components of the gear play a vital role in the efficiency and service life of the gear transmission. For different gear transmission occasions, it is necessary to reasonably select the structure and components of the gear according to the transmission requirements and working conditions, and adopt appropriate processing technology and quality control methods to ensure the performance and life of the gear.