Electric telescopic cylinders can be classified in various ways, presenting multiple types under different classification criteria.
Classification by Motor Installation Structure:
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Linear Electric Telescopic Cylinder: The motor and lead screw are installed on the same straight line. This structure effectively reduces the inertia and clearance of intermediate links, offering advantages such as a simple structure and convenient installation.
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Folding Electric Telescopic Cylinder: The motor and lead screw are installed with parallel axes rather than on the same straight line. Its notable feature is a shorter overall length, making it suitable for scenarios with limited installation space.
Classification by Type of Screw Transmission Mechanism:
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Trapezoidal Screw Electric Telescopic Cylinder: The screw pair adopts a trapezoidal screw sliding screw pair. Although it has disadvantages such as high transmission friction resistance and low transmission efficiency, limiting its application in small-load high-speed electric telescopic cylinders, it still has a place in applications with specific self-locking requirements due to its certain self-locking capability.
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Ball Screw Electric Telescopic Cylinder: Currently one of the most widely used types, it uses balls to roll in the raceways between the screw shaft and the screw nut. Under the same conditions, the friction coefficient of the contact surface in rolling friction is much smaller than that in sliding friction. Therefore, this type of electric telescopic cylinder can achieve high motion efficiency, while also offering advantages of high precision and reversibility.
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Planetary Roller Screw Electric Telescopic Cylinder: The screw pair uses a planetary roller screw, where the screw can be regarded as a sun gear and the rollers as planetary gears. The gears on both sides of the rollers ensure the synchronization of the meshing transmission between the rollers, screw, and nut, as well as pure rolling on the end section. It has large load-bearing capacity, high transmission precision, and high efficiency. However, its application range is currently relatively narrow due to limitations in related design technologies, processing techniques, and equipment.
