The spiral rod of the output shaft is fixed to the cylinder body, and the spiral teeth on the inner surface of the piston mesh with the spiral teeth of the spiral rod, and the surface shape of the spiral rod of the output shaft is the same as that of the outer surface of the piston. Therefore, when the piston is under hydraulic pressure in the rotating sleeve, the piston moves and rotates along the spiral rod, and the spiral rod with the output shaft rotates at the same time. Thus, the oscillating motion is realized. The spiral oscillating cylinder has the advantages of compact structure, safety and reliability, small space occupation, easy design, large output torque and oscillating angle, etc.

The oscillating hydraulic motor is a tightly assembled accessory that uses hydraulic pressure to collect very high torque in a small space. Despite the high power, they can be controlled precisely and easily, and HKS oscillating cylinders have been successfully used in almost all applications where limited rotary motion and high torque are required. During the salvage of the Russian nuclear submarine Kursk, 224 computer-controlled spiral oscillating cylinders were used to lift the submarine out of the sea. Special oscillating hydraulic cylinders with an accuracy of one tenth of a degree were used in the four-dimensional linear and rotational tests of the Daimler Benz Space (DASA) underwater simulator. HKS spiral oscillating hydraulic cylinders are used in all Dutch national railroad turnout controls. Our most powerful spiral oscillating cylinder can turn 20 Volkswagen Golf cars from one side to the other. Powerful, precisely positioned and easy to control, regardless of the output torque, HKS oscillating cylinders are used in almost every application where high-torque, limited oscillating motion is required. For example: port machinery, construction machinery, building machinery, ship loading and equipment operation, underground work, aerial work, subsea exploration devices and offshore platforms, special robots, logistics and transportation, agricultural and forestry machinery and equipment, food industry, tobacco machinery, pharmaceutical industry and petrochemical industry.

In order to achieve effective and reliable function, high manufacturing precision is required. The inside of the cylinder is well protected from dust and dirt and moisture. This precision is accompanied by a robust and well-sealed housing, which allows the cylinder to withstand working pressures of up to 350 bar.

pressure. The oscillating cylinders can also be used in very harsh conditions, underground and below 2300 meters above sea level. As an example, 224 oscillating cylinders were used to lift the Russian atomic submarine "Kursk" out of the sea level during its salvage, which contributed to the safe execution of the rescue. Oscillating cylinders are even used in the pharmaceutical and food processing industries, where high cleanliness and health care are required.