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Oil film supporting servo hydraulic cylinder

A servo hydraulic cylinder and oil film technology, applied in the field of servo hydraulic cylinders, can solve the problems of restricting dynamic response characteristics, poor dynamic response characteristics, unsuitable for high-speed operation, etc., and achieve the effect of improving dynamic response, good dynamic response and low friction.

Inactive Publication Date: 2009-08-05
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Nevertheless, the existing hydraulic cylinder components have the following problems: ordinary hydraulic cylinders have large friction, poor dynamic response characteristics, and are not suitable for high-speed operation; even though the piston is made of polytetrafluoroethylene, the support ring still used on the guide sleeve, This increases the friction and restricts the further improvement of the dynamic response characteristics

Method used

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  • Oil film supporting servo hydraulic cylinder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The utility model relates to a hydraulic cylinder supported by an oil film. The servo hydraulic cylinder as figure 1 Shown: including cylinder 1, piston 2, piston rod 7, guide sleeve 4 and gland 6. The guide sleeve 4 passes through the piston rod 7 and is fixedly installed on the shoulder of the cylinder body 1. A sealing ring 3 is installed at the contact between the left side of the guide sleeve 4 and the shoulder of the cylinder body 1. The guide sleeve 4 and the piston rod 7 There are 3 to 5 balance grooves 9 at the contact point, and the rightmost balance groove 9 communicates with the second oil-repellent passage 11 through the first oil-repellent passage 10; At the end of the cavity, a U-shaped sealing ring 5 is arranged on the right side of the guide sleeve 4 and at the contact with the piston rod 7 .

[0015] Among them: the material of the guide sleeve 4 is bronze; the contact between the guide sleeve 4 and the shoulder of the cylinder body 1 is provided wit...

Embodiment 2

[0017] The utility model relates to a hydraulic cylinder supported by an oil film. The structure of the servo hydraulic cylinder is as follows figure 1 As shown, there are 5-7 balance grooves 9 at the contact point between the guide sleeve 4 and the piston rod 7, and the gap between the guide sleeve 4 and the piston rod 7 is 15-25um; the groove width of the balance groove 9 is 0.8-1, The groove depth is 0.8-1 mm, and the distance between each balancing groove 9 is 5-8 mm.

[0018] All the other are with embodiment 1.

[0019] This embodiment has the following characteristics:

[0020] 1. There are 3 to 7 balance grooves 9 in the inner circle of the guide sleeve 4, and a layer of oil film is formed in the matching gap. The oil in the balance groove 9 not only acts on the piston rod 7 radially, so that it coincides with the center of the guide sleeve 4 , and is conducive to the movement of the piston rod 7 and the piston 2, improving the dynamic response.

[0021] 2. With oi...

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Abstract

The invention relates to a servo hydraulic cylinder supported by an oil film, which adopts the technical scheme that the servo hydraulic cylinder comprises a cylinder body (1), a piston (2), a piston rod (7), a guide sleeve (4) and a press cover (6), wherein the guide sleeve (4) passes through the piston rod (7) and is fixedly arranged at the shoulder position inside the cylinder body (1), a sealing ring (3) is arranged at the contact position of the guide sleeve (4) and the shoulder position of the cylinder body (1), three to seven balancing grooves (9) are arranged at the contact position of the guide sleeve (4) and the piston rod (7), the rightmost balancing groove (9) is communicated with a second oleophobic passage (11) through a first oleophobic passage (10), the press cover (6) tightly presses the guide sleeve (4) and is fixed on the small cavity end of the cylinder body (1), and the contact position of the right side of the guide sleeve (4) and the piston rod (7) is provided with a U-shaped sealing ring (5). The invention has the advantages of long service life, little friction, good dynamic response and little leakage.

Description

technical field [0001] The invention belongs to the technical field of servo hydraulic cylinders. In particular, it relates to an oil film supporting servo hydraulic cylinder. Background technique [0002] In order to improve and adapt to the dynamic quality requirements of the hydraulic servo system, the servo hydraulic cylinder requires low friction, no external leakage, and long life, so its seal and support guide design is extremely important, and the ordinary seal and support guide cannot be simply used. At present, in order to reduce the leakage of the servo hydraulic cylinder, the method of "blocking" is basically adopted. The hydraulic cylinder uses polytetrafluoroethylene at the guide sleeve, because of its good chemical stability, it has good wear resistance, oil resistance and heat resistance. . [0003] Nevertheless, the existing hydraulic cylinder components have the following problems: ordinary hydraulic cylinders have large friction, poor dynamic response ch...

Claims

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Application Information

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IPC IPC(8): F15B15/14
Inventor 曾良才周敏湛从昌陈新元陈奎生付连东张飞龙钱道光兰伟罗先兵涂福泉
Owner WUHAN UNIV OF SCI & TECH
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