GB/T 2879-1986 Hydraulic cylinder piston and piston rod dynamic seal groove type, size and tolerance GB/T2879-1986 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Hydraulle fluid power-Cylinder rod and piston rod
Dynamic seal groove type, dimensions and tolerances
Hydraulle fluid power-Cylinder rod and piston rod for reciprocating applications-Dimensions and tolerances of housings
1 Introduction
UdC 621-762
GB 2879-86
Replaces GB 2879-81
1.1 The dynamic seal groove type, dimensions and tolerances specified in this standard are applicable to various types of seals installed on the piston and piston rod of reciprocating hydraulic cylinders for one-way sealing.
1.2 This standard refers to the international standard ISO559711-1981 "Hydraulic power-Seals for reciprocating hydraulic cylinder pistons and piston rods-Groove dimensions and tolerances, Part 1: Common series". 2 Reference standards
GB1800~1804-79 "Tolerances and fits" GB1031-83 "Surface roughness parameters and their values" GB2348-80 "Hydraulic and pneumatic systems and components cylinder diameter and piston rod outer diameter series" 3 Letter symbols
This standard uses the following letter symbols:
D——seal groove outer diameter (red inner diameter or piston rod dynamic seal groove bottom diameter) + d—seal groove inner diameter (piston dynamic seal groove bottom diameter or piston rod diameter), Dd
S-——dynamic seal groove radial depth (S =—2
L—Axial length of the sealing groove (L, suitable for short seals, L, suitable for medium seals, L, suitable for long seals); C
—lead angle length,
—piston matching diameter
—diameter and clearance of the piston rod.
4 Seal groove typewwW.bzxz.Net
The dynamic seal groove type of the hydraulic cylinder piston is shown in Figure 1. Issued by the National Bureau of Standards on July 22, 1986
Implementation on May 1, 1987||t t||GB2879—B6
Figure 1 Typical structure of hydraulic cylinder piston dynamic seal groove type 4.2 The type of hydraulic cylinder piston rod dynamic seal groove is shown in Figure 2. Figure 2 Typical structure of hydraulic cylinder piston dynamic seal groove type 5? Dimensions and tolerances
GB2879—86
The dimensions and tolerances of the hydraulic cylinder piston dynamic seal groove shall comply with the provisions of Table 1. Table 1 Dimensions and tolerances of hydraulic cylinder piston dynamic seal groove 0.2
(280）
(460）
GB 287986
Note: The sliding surface tolerance is recommended to be H9/T8, but when the hydraulic cylinder is not used under strict conditions, the sliding surface tolerance can also be H10/19. ② The cylinder inner diameter in brackets is a non-preferred size. The dimensions and tolerances of the dynamic seal groove of the hydraulic cylinder piston rod shall comply with the provisions of Table 2: 5.2
GB2879-86
Table 2 Dimensions and tolerances of the dynamic seal groove of the hydraulic cylinder piston rod D
: 225
GB 2879B6
Continued Table 2
Note: The sliding surface tolerance is recommended to be H9/T8, but when the hydraulic cylinder is not used under strict conditions, the sliding surface tolerance can also be H10/19. GB 2878—86
Appendix A
Calculation of radial depth of dynamic seal groove and bottom diameter of groove (reference)
A,1 The radial depth of dynamic seal groove shall comply with the provisions of the following table. s
The calculation formula of the inner diameter of piston dynamic seal groove is as follows (see Figure A): A.2
dmar = Pmin - 2Smia
dmin =2Dmax -Pmin -2Smar
A,3 The calculation formula of the outer diameter D of piston rod dynamic seal groove is as follows (see Figure 2): Dmax =2dmin -Gmax +2Smax
Dmin =Gmax. +2Smin
Additional remarks:
This standard is proposed by the Ministry of Machinery Industry of the People's Republic of China and is under the jurisdiction of the National Hydraulic and Pneumatic Standardization Technical Committee. This standard was drafted by Tianjin Engineering Machinery Research Institute and Beijing Machinery Industry Automation Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are Jin Banbang, Fan Tianxun and Xu Xianzhang.
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