Qingdao Vanhon Machinery Technology Co.,Ltd.

Industry News
Application characteristics and working principle of rack and pinion
Dec 29, 2022

The characteristics of rack and pinion drive the same side of the rack tooth profile is parallel line, in any line parallel to the tooth alignment has the same pitch. Each point on the straight tooth profile of the rack has the same pressure angle, which is equal to the tooth profile angle of the straight tooth profile, which is generally a standard value. When the rack and pinion are installed as standard, the index circle of the gear coincides with the index line of the rack, and the meshing angle is equal to the profile angle; the gear rotates at an angular velocity, and drives the rack to move linearly at a linear velocity.


A rack is a special gear with teeth distributed on a bar-shaped body. Racks are also divided into straight toothed racks and helical toothed racks, which are paired with straight toothed cylindrical gears and helical toothed cylindrical gears respectively; the tooth profile of the rack is a straight line instead of an involute, which is equivalent to a cylinder with an infinite radius of the indexing circle gear.

Application characteristics and working principle of rack and pinion(图1)

(1) The characteristics of large transmission power and high-efficiency gear transmission. Gear transmission is used to transmit motion and power between any two shafts. Its peripheral speed can reach 300m/s, transmission power can reach 105KW, and the gear diameter can range from less than 1mm to more than 150m. It is the most widely used in modern machinery. Mechanical transmission;

(2) Long life, stable operation and high reliability;

(3) It can ensure a constant transmission ratio, and can transmit the motion between the two axes at any angle.


Rack and pinion transmission is a widely used transmission mechanism. This mechanism can not only convert rotary motion into linear motion, but also convert linear motion into rotary motion. It can also be combined with other transmission mechanisms to complete complex functions. As a belt conveyor, it is mainly used as a telescopic device, and the power is meshed with the rack through the gear to realize the forward or backward movement of the frame.


Application characteristics and working principle of rack and pinion(图2)

At present, in the machine tool manufacturing industry, rack and pinion transmission is a transmission part that is relatively guarded against in the operation of the machine tool. This form of transmission has many advantages and is longer in form. One's own needs are used continuously, especially on many large machine tools. This form of transmission can easily obtain high-speed linear motion. The transmission is relatively large, and we can produce various materials according to different aspects of the lathe. And form the rack with higher rigidity and mechanical efficiency. However, there are many shortcomings in many aspects. It should be that the stability of this form is based on the accuracy of the rack and gear. If the accuracy is not high enough, the machine tool will have certain problems when processing other parts. error. Therefore, if you want to eliminate the error of such parts and reduce the running noise in the machine tool, you must continuously increase the accuracy of the rack and gear, and continuously improve the wear resistance and heat treatment of the material.

Working principle of rack:

Racks are divided into straight racks and helical racks, which are used in conjunction with spur gears and helical gears respectively. The tooth profile of the rack is straight instead of involute (the plane of the tooth surface), which is equivalent to a cylindrical gear with an infinite pitch circle radius.


A rack and pinion mechanism consists of a gear and a rack. The working principle of the rack and pinion mechanism is to convert the rotational motion of the gear into the reciprocating linear motion of the rack, or convert the reciprocating linear motion of the rack into the rotational motion of the gear.


Application range of rack and pinion transmission:

1. The rack and pinion has the advantages of high load capacity and high precision. Suitable for fast and precise positioning mechanism.

2. In factory automation equipment, we can often see the rack and pinion used together with the reducer. Suitable for CNC machine tools, machining centers, cutting machines, welding machines, etc. with heavy load, high precision, high rigidity, high speed and long stroke.

3. It is suitable for factory automation quick transplanting machinery, industrial robot arm grabbing mechanism, CNC machine tools, etc.

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