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Hydraulic cylinder with clearance sealed type deformed piston

A piston clearance and sealing technology, applied in the field of hydraulic cylinder, can solve the problems of difficult to control clearance and leakage, achieve the effect of simple structure, reduce leakage and improve frequency response

Inactive Publication Date: 2010-06-09
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is not easy to control the clearance and leakage

Method used

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  • Hydraulic cylinder with clearance sealed type deformed piston
  • Hydraulic cylinder with clearance sealed type deformed piston
  • Hydraulic cylinder with clearance sealed type deformed piston

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A deformation piston gap sealing hydraulic cylinder, such as figure 1 As shown, the hydraulic cylinder includes a cylinder block 1, a piston 5, a piston rod 18, a guide sleeve 11 and an end cover 15. It is characterized in that there are 3 to 5 balance grooves 6 symmetrically and evenly opened on the outer circle of the piston 5. The piston rod 18 of the piston 5 is provided with a first sealing groove 7 , and the end faces on both sides of the piston 5 are provided with annular bosses having the same outer diameter as the piston 5 .

[0026] A second sealing groove 16 is provided at the outer circumference of the guide sleeve 11, and a first oil drain groove 14 and a second oil drain groove 17 are respectively provided at the inner and outer circles of the guide sleeve 11. The first oil drain groove 14 passes through the The second oil drain channel 13 communicates with the second oil drain channel 17, the second oil drain channel 17 communicates with the first oil dra...

Embodiment 2

[0034] A deformation piston gap sealing hydraulic cylinder. The shape of the annular boss is as figure 2 As shown, the cross section is a right trapezoid, the included angle of the right trapezoid is α=30~35°, the height of the right trapezoid is L=8~12mm, and the length of the upper base of the right trapezoid is N=1.2~1.5mm. The annular boss is integral with the piston 5 .

[0035] The annular groove on the inner end face of the guide sleeve 11 is as follows: image 3 As shown, the depth of the annular groove is L'=8~12mm, the bottom width of the annular groove is K'=8~10mm, the cross section of the annular groove is a right-angled trapezoid, and the included angle of the right-angled trapezoid is α'=30~35° ; The difference between the inner radius of the annular groove at the end face and the inner radius of the guide sleeve 11 is ΔR′=1.3~1.5mm;

[0036] The groove width of the balance groove 6 on the piston 5 is 0.6-0.8mm, the groove depth is 0.8-1.0mm, and the distanc...

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Abstract

The invention particularly relates to a hydraulic cylinder with a clearance sealed type deformed piston, which adopts the following technical scheme that: an excircle of a piston [5] is uniformly and symmetrically provided with 3 to 5 balance slots [6]; a piston rod [18] of the piston [5] is provided with a first seal groove [7]; an annular boss of which the outer diameter is the same as that of the piston [5] is arranged on the end faces of two sides of the piston [5] respectively; an excircle of a guide sleeve [11] is provided with a second seal groove [16]; a first drain pan [14] and a second drain pan [17] are arranged on an inner circle and the excircle of the guide sleeve [11] respectively; the first drain pan [14] is communicated with the second drain pan [17] through a second oil drain channel [13]; the second drain pan [17] is communicated with a first oil drain channel [12] arranged on a cylinder body [1]; and an end face, close to the inner circle, of the inner side of the guide sleeve [11] is provided with am annular groove. The hydraulic cylinder has the characteristics of simple structure, convenient assembly and disassembly and maintenance, long service life, small friction, high frequency response, high reliability, external leakage prevention, and the like.

Description

technical field [0001] The invention belongs to the technical field of hydraulic cylinders. In particular, it relates to a hydraulic cylinder of a deformation piston gap sealing type. Background technique [0002] Hydraulic cylinders, especially servo hydraulic cylinders, require low friction, no creep, high frequency response, long life, and high reliability to meet the static and dynamic performance requirements of hydraulic servo systems. Therefore, the sealing form and material selection between the piston and the cylinder body, as well as the design of the guide sleeve and the selection of the sealing material are very important. [0003] At present, the most successful application is the rubber-plastic composite sealing ring composed of a non-metallic material ring with a square or rectangular cross-section and an O-shaped rubber ring. It has good wear resistance, oil resistance and heat resistance, and has a small friction coefficient. However, its assembly process ...

Claims

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Application Information

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IPC IPC(8): F15B15/14
Inventor 湛从昌陈新元李成陈奎生蒋俊傅连东曾良才刘利明朱学彪付曙光
Owner WUHAN UNIV OF SCI & TECH
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