Small-volume heavy-duty multi-stage electric cylinder

Abstract

The invention discloses a small-volume heavy-duty multi-stage electric cylinder. The small-volume heavy-duty multi-stage electric cylinder comprises an electric cylinder body, a motor, and a reductiongearbox; the electric cylinder body is provided with a planetary ball screw shaft, a hollow ball screw shaft, a guide rod, an inner supporting sleeve, and an outer supporting shell body from the inside to the outside, wherein the planetary ball screw shaft, the hollow ball screw shaft, the guide rod, the inner supporting sleeve, and the outer supporting shell body are coaxial; linear motion of asupporting plate is realized through cooperation of a guide key groove formed in theouter circle of the supporting plate and an outer guide key arranged on the inner circle of the outer supporting shell body, the hollow ball screw shaft is connected with a hollow ball screw nut in a threaded mode and fixedly connected with one end of the guide rod through the hollow ball screw nut, and linear motion of the hollow ball screw nut is realized through cooperation of the guide key groove formed in the outer circle of the hollow ball screw nut and an inner guide key arranged on the inner circle of the inner supporting sleeve; and the reduction gearbox is fixedly connected with the motor and fixedly connected with the planetary ball screw shaft through a worm wheel, and a reduction gearbox shellbody is fixedly connected with one end of the outer supporting shell body. The space volume is reduced, thus axial stiffness is significantly increased, and the bearing capacity is enhanced.

Description

technical field [0001] The invention relates to an electric cylinder mechanism, in particular to a small-volume heavy-duty multistage electric cylinder. Background technique [0002] As the core actuator of all-electric combat vehicles, multi-degree-of-freedom robots and other equipment, electric cylinders have been widely used in vehicle leveling and erection, astronomical instrument observation and other fields. Due to the small expansion ratio, large volume, and small load capacity of ordinary electric cylinders, at present, multi-stage hydraulic cylinders are still used in fields such as vertical launches that require small installation space and long working strokes. During the working process of multi-stage hydraulic cylinders, there are problems such as large impact of changing stages and the phenomenon of "running, popping, dripping and leaking", which have always plagued large-scale vertical launches. Therefore, the study of multi-stage electric cylinders with larg...

AI Technical Summary

Problems solved by technology

During the working process of multi-stage hydraulic cylinders, there are problems such as large impact of stage change and "running, popping, dripping and leaking", which have always plagued large vertical launchers.

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