What are the main characteristics of the rack

We mainly introduce the main features of various racks

(1) Because the rack tooth profile is a straight line, each point on the tooth profile has the same pressure angle and is equal to the inclination angle of the tooth profile. This angle is called the tooth shape angle, and the standard value is 20 °.

(2) Any straight line parallel to the tooth crest line has the same pitch and modulus.

(3) The straight line parallel to the tooth crest line and having a tooth thickness equal to the width of the tooth groove is called the graduation line (centerline), which is the reference line for calculating the size of the rack.

Features of horizontal rack and pinion piston actuators:

① Easily designed as a dual piston type, doubling its output torque; Conversely, when the output torque is constant, a smaller size actuator can be obtained, resulting in a significant reduction in weight and size The gear rack rotates evenly and has small rotational clearance, so it can move freely and has small backlash; ③ The friction force of the rack and pinion transmission mode is much smaller than the sliding friction mode of the crank connecting rod, and the efficiency can be improved by 20% with the same diameter; ④ It is very easy to connect directly to the valve, simplifying the connection method of the valve, and making the configuration of the valve more symmetrical, beautiful, and miniaturized. Practice has proven that this type of angular stroke piston actuator is increasingly used and will become the mainstream of angular stroke piston actuators.