Hydraulic cylinders, hydraulic drive systems and construction machinery

A technology for driving systems and construction machinery, applied in the direction of fluid pressure actuation devices, etc., can solve problems such as abnormal noise, piston rod shaking and crawling, etc., and achieve the effects of improving low-speed dynamic performance, improving sealing performance, and improving anti-side load capacity.

Active Publication Date: 2020-12-15
HUNAN TELI HYDRAULIC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the problems existing in the prior art that the piston rod of the large-diameter and long-stroke hydraulic cylinder is accompanied by shaking, crawling or abnormal noise when extending and retracting at low speed

Method used

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  • Hydraulic cylinders, hydraulic drive systems and construction machinery
  • Hydraulic cylinders, hydraulic drive systems and construction machinery
  • Hydraulic cylinders, hydraulic drive systems and construction machinery

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Embodiment Construction

[0037] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0038] In the present invention, the terms "first", "second", ..., etc. are only used to distinguish different technical features, and are not used to limit the priority of technical features. When necessary, these technical features The effect that can be achieved is basically the same. In the present invention, in the case of no contrary description, the used orientation words such as "up, down, left and right" usually refer to the up, down, left and right shown in the accompanying drawings; "inside and outside" Refers to the inside and outside of the outline of each part itself.

[0039] refer to Figure 2 to Figure 5 As shown, the present invention provid...

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Abstract

The invention relates to the technical field of hydraulic equipment and discloses a hydraulic cylinder, a hydraulic driving system and an engineering machine. The hydraulic cylinder comprises a cylinder body, a piston slidably arranged inside the cylinder body, a piston rod fixedly connected to the piston, a first guiding sleeve, a second guiding sleeve and a cap. A first circumferential gap is formed between the piston rod and the inner wall of the cylinder body; the first guiding sleeve is at least partially arranged in the first circumferential gap, and a second circumferential gap is formed between the first guiding sleeve and the piston rod; the second guiding sleeve is arranged on the piston rod in a sleeving mode and at least partially located in the second circumferential gap, andmeanwhile, the second guiding sleeve is attached to the piston rod in a sealed mode and can radially float along with the piston rod relative to the first guiding sleeve; and the cap is arranged at the open end of the cylinder body in a covering mode and enables the cylinder body, the first guiding sleeve and the second guiding sleeve to be fixed to one another in the axial direction. According tothe hydraulic cylinder, the follow-up property of sealing of the guiding sleeves and the piston rod is improved, the sealing property of piston rod sealing is improved, and the side-loading resistingcapability and the low-speed dynamic property of the hydraulic cylinder are improved.

Description

technical field [0001] The invention relates to the technical field of hydraulic equipment, in particular to a hydraulic cylinder, a hydraulic system with the hydraulic cylinder and an engineering machine with the hydraulic system. Background technique [0002] Large-diameter and long-stroke hydraulic cylinders have low-speed stability requirements during use, that is, high low-speed dynamic performance requirements. like figure 1 In the hydraulic cylinder shown, during the process of extending and retracting the piston rod at low speed, due to side load, fit clearance, accumulated machining error and the weight of the piston rod, etc., it is accompanied by vibration, crawling or abnormal noise. At present, in order to ensure that the piston rod does not vibrate, crawl or make abnormal noise during low-speed extension and retraction, the common methods are to improve the machining accuracy of the oil cylinder, increase the fit clearance and reduce the minimum stable operati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B15/14F15B15/20
CPCF15B15/14F15B15/1461F15B15/1471
Inventor 易鑫穆元好左美燕
Owner HUNAN TELI HYDRAULIC
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