The dynamic seal groove dimensions and tolerances specified in this standard are applicable to the installation of narrow-section Y-shaped or other types of seals on hydraulic cylinder pistons and piston rods with a working pressure of less than or equal to 200 bar. GB/T 2880-1981 Dimension series and tolerances of narrow-section dynamic seal grooves on hydraulic cylinder pistons and piston rods GB/T2880-1981 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Hydraulic fluid power-
-Cylinder rod and piston seals for reciprocating applications-Dimensionsandtolerances ofhousings
-Narrow section series
UDC 621.8.032
:621.643.44
GB288081
The dimensions and tolerances of dynamic seal grooves specified in this standard are applicable to narrow section Y-shaped or other types of seals for hydraulic cylinders and piston rods with a working pressure less than or equal to 200 bar.
1 Groove type, dimension series and tolerance of narrow section dynamic seals for hydraulic cylinder pistons 1.1 The groove type of narrow section dynamic seals for hydraulic cylinder pistons shall comply with the provisions of Figure 1. 30
1.2 The size series and tolerances of the narrow-section dynamic grooves used for liquid E red river plugs shall comply with the requirements of Table 1. Issued by the General Administration of Standards of the People’s Republic of China on January 21, 1982
Implemented on March 1, 1989
Nominal inner diameter
(45）
Groove depth
GB 2880-81
Groove length L
Groove bottom diameter
- 0, 17
- 0, 14
- 0, 11
- 0, 13
+0,006
Nominal inner diameter
Groove depth
GB 2880—81
Continued Table 1
Groove length
Groove bottom diameter
- 0:16
Note: 0 When the nominal inner diameter is greater than 500mm, it shall be selected according to the 1R10 number system of GB321-80 "Preferred Numbers and Preferred Number Systems". 2 The sliding surface tolerance is recommended to be H9「8.
When the groove type is required, the assembled structure can also be used. 3, L, series is preferred. ? series is suitable for use with old rats or Weifeng accessories. The inner diameter of the cylinder in brackets is not preferred. R
GB 2880—81
3 Marking method for dynamic seals for hydraulic cylinders
Iron rubber
Urethane rubber
Z Narrow section
Sea length
Piston groove nominal bottom diameter
Nominal inner diameter
Hydraulic cylinder
2 Groove type, dimension series and tolerance of narrow section dynamic seals for hydraulic cylinder piston rods 2.1 The groove type of narrow section dynamic seals for hydraulic cylinder piston rods shall comply with the provisions of Figure 2. Figure 2
2.2 The groove dimension series and tolerance of narrow section dynamic seals for hydraulic cylinder piston rods shall comply with the provisions of Table 2. Nominal outer diameter of piston rod
Groove depth
GB 2880—a1
Groove length L
Groove bottom diameter
.+0.14
Nominal outer diameter of piston rod
Groove depth
GB 2680—B1
Continued Table 2
Groove length L
Groove pin bottom diameter
Note: When the nominal outer diameter d of the piston rod is greater than 360mm, the R20 numerical system in GB32180 can be selected. The sliding surface tolerance is recommended to be H9/f8.
- 0, 08
+ 0, 05
GB2880-81
③When the form of the repair is required, the assembled structure can also be used. The L series is preferred. The L series is suitable for the use of old products or repair parts. The outer diameter marked with "*" is limited to the use of sleeve cylinders.
Marking method for dynamic seals for live rods:
GB 2880--81
Appendix A
Calculation of radial depth of installation groove and bottom diameter of groove (reference part)
: The radial depth of the installation groove of the narrow section dynamic seal shall comply with the provisions of the following table. Nominal depth of the groove
Limiting depth
The calculation of the bottom diameter d of the installation groove of the narrow section dynamic seal for live rods shall be based on the following formula (see Figure 1 of this standard) A.2
dmiax = Pmin -2Smin
d min =27)max - Pmin -2SmaxwwW.bzxz.Net
The calculation of the bottom diameter D of the installation groove of the narrow section dynamic seal for piston rod shall be based on the following formula (see Section 2 of this standard) A.3
Dmax =2d min -Gmax +2Smax
Dmin=Gmax +2Smin
Additional Notes:
This standard is proposed and managed by the National Hydraulic and Pneumatic Standardization Technical Committee. mm
This standard was drafted by the Tianjin Engineering Machinery Research Institute of the First Ministry of Machinery Industry. The drafting units include: Haizhong Heavy Machinery Factory\; Tianjin Forging Machine Tool Factory, Shenyang Heavy Machinery Factory, Changzhi Hydraulic Parts Factory and other units. This standard is entrusted to the Secretariat of the National Hydraulic and Pneumatic Standardization Technical Committee for interpretation. The main drafters of this standard are Jin Zhenbang, Zhang Nianhua, Jin Shangxian, Chen Fengyun, and Zhou Yuzhen.
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