Trapezoidal screw

Trapezoidal screw (also known as threaded screw) is a common mechanical transmission element used to convert rotary motion into linear motion or to achieve force transmission. It consists of an arbor with a thread pitch and a nut that fits its thread.

The thread shape of the trapezoidal screw usually adopts a trapezoidal section, so it is named the trapezoidal screw. The cross-sectional shape of the trapezoidal thread is similar to an isosceles trapezoid with symmetrical slopes on both sides. This thread shape allows the nut to move axially along the screw during rotational movement, achieving linear movement.

The trapezoidal screw mainly has the following characteristics:

1. Lower transmission efficiency: Compared with the ball screw, the transmission efficiency of the trapezoidal screw is lower, mainly due to the greater friction.

2. Relatively simple manufacturing and low cost: The manufacturing process of the trapezoidal screw is relatively simple and the cost is low, which is suitable for some low-demand application scenarios.

3. Lower load-bearing capacity: Compared with ball screws, trapezoidal screws have lower load-bearing capacity and are not suitable for large loads and high-speed motion requirements.

4. Large clearance and return error: The trapezoidal screw may have large clearance and return error during the movement process, which is not suitable for applications that require precise positioning.

Although the transmission efficiency and precision of the trapezoidal screw are relatively low, it is still widely used in some industrial equipment, automation systems, conveyor belts and other low-speed, low-precision or low-load occasions to achieve simple linear motion or force transmission.