servo actuator

Abstract

The present invention provides a servo actuator, comprising: a cylinder, a first mounting cavity penetrating along its axial direction is defined in the cylinder; a piston rod, at least a part of the piston rod is movably arranged on the first In the installation cavity; two end caps, the two end caps are respectively arranged at the two ends of the cylinder barrel, the two end caps are formed as columnar coaxially arranged and each end cap is respectively provided with a guiding channel penetrating along its axial direction, The two ends of the piston rod extend out of the first installation cavity through the guide channel respectively, and the outer wall of each end cover is provided with at least one groove communicating with the guide channel, and the end cover is provided with a second oil inlet communicating with the groove And the second oil outlet that communicates with the guide channel; the pressure block, the pressure block is arranged on the outer wall surface of the end cover and cooperates with the corresponding groove to define a static pressure oil chamber; a throttle valve; a cylinder bottom assembly; a sensor assembly. The servo actuator according to the embodiment of the present invention not only has a simple structure, is compact and reasonable in arrangement, saves installation space, but also can achieve low friction and has anti-eccentric load capability.

Description

technical field [0001] The invention relates to the technical field of hydraulic cylinders, in particular to a servo actuator. Background technique [0002] In the prior art, commonly used ordinary hydraulic cylinders use low-friction sealing rings and guiding structures to achieve low-friction requirements. Among them, the sealing material is filled with PTFE, and the guiding structure is made of soldered copper, inlaid copper sleeves or nylon sleeves. The hydraulic cylinder has high friction and poor anti-eccentric load capacity. It is easy to cause leakage due to heat generation and wear at high frequency use, and the frequency response is low (generally below 15HZ). In addition, according to the principle of hydrostatic bearings, a certain flow of oil first passes through the throttle valve (fixed throttle port), and then passes into the oil pad cavity (variable throttle port). Split design, the oil cushion cavity is designed in the inner hole of the guide sleeve, and 4...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, commonly used ordinary hydraulic cylinders use low-friction sealing rings and guiding structures to achieve low-friction requirements. Among them, the sealing material is filled with PTFE, and the guiding structure is made of soldered copper, inlaid copper sleeves or nylon sleeves. Hydraulic cylinders have high friction and poor anti-eccentric load capability. High-frequency use is prone to leakage due to wear and tear due to heat generation, and the frequency response is low (generally below 15HZ)

In addition, according to the principle of hydrostatic bearings, a certain flow of oil first passes through the throttle valve (fixed throttle port), and then passes into the oil pad cavity (variable throttle port). Split design, the oil cushion cavity is designed in the inner hole of the guide sleeve, and 4 or 6 oil circuits are separated to connect with 4 or 6 corresponding throttle valves (the number corresponds to the static pressure oil chamber), but the overall structure is complicated and the tube The road layout is cumbersome, takes up a lot of space, is not suitable for mass production, and has poor versatility

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