Worm Gear Screw Jack: Principle and Applications

Principle

A worm gear screw jack is a mechanical transmission device that converts the rotary motion of a worm gear into linear motion of a screw. This transformation is achieved through the frictional engagement between the helical threads of the worm and the matching threads of the worm wheel. The worm, typically having a helix angle of 45 degrees, meshes with the worm wheel, resulting in a high gear ratio.

Structure

A worm gear screw jack consists of several components: a worm wheel, a worm, a screw, a guiding bracket, support bearings, and a driving motor. The worm wheel is the driving component, while the worm is the driven component. When the worm wheel rotates, it drives the worm to rotate, and the rotation of the worm causes the screw to move linearly. Based on the different configurations of the worm and worm wheel, worm gear screw jacks can be classified into single-start, double-start, and multi-start types.

Working Principle

When the driving motor rotates the worm wheel, the worm rotates accordingly. Due to the meshing relationship between the worm and worm wheel, the worm wheel cannot rotate but moves along the helix of the worm, driving the screw to move linearly.

Applications

Worm gear screw jacks are widely used in various industries, including manufacturing, medical, and construction, due to their high precision, large gear ratio, and strong load-carrying capacity. In manufacturing, worm gear screw jacks are primarily used for lifting, conveying, feeding, and processing. In the medical field, they are commonly used in operating tables, hospital beds, and isolation wards. In construction, worm gear screw jacks are applied in elevators, cargo lifts, and escalators.

In conclusion, worm gear are essential mechanical transmission devices with broad applications. For enterprises using these devices, it is crucial to select the appropriate model and parameters based on specific requirements to achieve optimal lifting performance.