Gear

Equipped with high-precision straight gears, helical gears and internal gears

Gears can be classified into the following types: 

1. Straight gear: A cylindrical gear whose tooth lines are parallel straight lines on the axis. This is a very common type of gear, and there is also a type that is integrated with the shaft. 

II. Helical Gear and Tooth Profile Parameters: A helical gear is a cylindrical gear with a helical line on its outer circumference. It consists of two parts that can be attached to the cylindrical surface, and it can also be referred to as a helical gear. The helical gear and the straight tooth plate should mesh in the normal direction. To better observe the changes in the meshing area, a helical cylindrical gear with a module of 5, a helix angle of 45 degrees, a shift coefficient of zero, and a tooth width of 40 was made. Additionally, a standard straight tooth plate (with the same module as the gear and a pressure angle equal to the normal pressure angle of the gear) was also created. The width of the plate was increased compared to the gear to ensure that the contact area of the gear during meshing is entirely within the tooth plate. At the same time, the meshing line between the gear and the tooth plate was drawn into a plane, and this plane is the position through which the meshing area should pass. After the combination of the gear and the tooth plate was completed, a motion simulation was conducted. The helical gear rotates, the straight tooth plate moves horizontally, the meshing surface is stationary, and the meshing area is formed by the meshing of the tooth surfaces of the gear and the tooth plate, as well as the plane formed by the meshing line. The combination of the three is quite clear, which also provides evidence that the meshing line of the helical gear is a straight line. Because the meshing surface is composed of the three components, and the two of them (the tooth surface of the tooth plate and the plane formed by the meshing line) are both planes, the intersection line of the two planes, needless to say, is a straight line, and this straight line remains in the middle of the meshing area and does not change as the meshing area moves. After completing the drawing, both sides of the gear were observed, and the result was quite satisfactory.

III. The human-shaped gear is a component composed of two inclined gears on either side. When viewed from the front, the teeth of the gear resemble the shape of a mountain. 

4. Rack: A transmission component with evenly spaced and identical-shaped teeth engraved on one side of a flat plate or a straight rod. We can consider the rack as a straight cylindrical gear with an infinitely large radius. The gears that mesh with the rack are usually ordinary small gears. 

5. Internal gears, cylindrical and conical gears with teeth machined on the inner side. The gears they mesh with must be external gears. 

A gear is a wheel with teeth. Through its meshing action, it transmits the rotational motion of one shaft to another. It conveys motion or torque between two shafts. There are many types of gears, classified according to the axis of the gear. There are parallel axes (parallel axis), intersecting axes (intersecting axis), and non-parallel and non-intersecting axes (non-parallel and non-intersecting axis). Module: This is a reference indicating the size of the gear teeth. For a pair of meshing gears, their modules must be the same; otherwise, the different specifications of the gear teeth will prevent smooth operation. To explain the module in words: it is the ratio of the pitch diameter to the number of teeth, usually in (mm). The module is usually used in the metric system, while in the imperial system, its equivalent is the pitch diameter, which is the ratio of the number of teeth to the pitch diameter. In terms of meaning, it is the reciprocal of the module. The unit is (teeth/inch). Module: m = D/N Pitch diameter: Pd = N/D Pitch circle: It is a theoretical circle. In a pair of meshing gears, their pitch circles must be tangent to each other. Pitch diameter: It is the diameter of the pitch circle. Pressure line: When two gears are in contact, the direction perpendicular to the contact surface is the pressure line. Usually, the forward load is transmitted along the pressure line. Pressure angle PA: This is the angle formed by the common tangent of the two gear pitch circles and the pressure line. Generally, there are 14.5 degrees and 20 degrees of pressure angles. Nowadays, the 20-degree pressure angle is more commonly used to prevent interference situations from occurring. The characteristics, applications and uses of gear transmission Gear transmission is one of the widely used transmission forms.