Double helix swing hydraulic cylinder

Abstract

The invention discloses a double helix swing hydraulic cylinder. The double helix swing hydraulic cylinder comprises a cylinder body, an output rotating shaft, an end cover, a piston and a fixing piece. A channel is defined in the cylinder body; and at least a part of the outer wall surface of the output rotating shaft and the inner wall surface of the channel are distributed at an interval; the piston is located in the channel and divides the channel into a first chamber and a second chamber which are arranged at an interval. The piston sleeves the outer periphery of the output rotating shaftand can reciprocate under the action of pressure oil, and at least a part of the inner wall surface of the piston and the outer wall surface of the output rotating shaft form a first helix pair; anda part of the fixing piece is connected with the inner wall surface of the channel, another part of the fixing piece and the outer wall surface of the piston form a second helix pair, the second helixpair cooperates with the first helix pair to convert the axial movement of the piston into the circumferential rotation of the output rotating shaft, and at least a part of the first helix pair and the second helix pair are distributed in a staggered mode in the axial direction of the channel. The double helix swing hydraulic cylinder can convert the linear movement of the piston into the rotarymovement of the output rotating shaft by using a large helix angle.

Description

technical field [0001] The invention belongs to the technical field of hydraulic cylinders, and in particular relates to a double-helix swing hydraulic cylinder. Background technique [0002] At present, in order to realize the rotary motion of a certain part under heavy load, the large-scale construction machinery produced in China mostly adopts rack-and-pinion or vane-type swing hydraulic cylinders. [0003] For the vane type swing hydraulic cylinder, it has the advantages of simple structure, convenient processing, and stable torque output. However, the seal of the moving part is prone to internal leakage, which makes it difficult to further improve the volumetric efficiency and operating pressure, which directly leads to the fact that the output torque cannot be too large. In addition, due to its own structural problems, its output rotation angle cannot be more than 360°. [0004] For the rack and pinion type swing hydraulic cylinder, it has the advantages of simple st...

AI Technical Summary

Problems solved by technology

However, it is large in size and cannot be installed on some compact devices

Rack-and-pinion or vane-type swing hydraulic cyl

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