JB/T 7973-1999 JB/T 7939-1999 Ratio of two chamber area of ​​single piston rod hydraulic cylinder JB/T7939-1999 Standard download decompression password: www.bzxz.net

ICS 23.100.20
Machinery Industry Standard of the People's Republic of China
JB/T7939-1999
eqvIso7181:1991
Hydraulic fluid power-Cylinders -Bore and rod area ratios
Hydraulic fluid power-Cylinders -Bore and rod area ratiosIssued on 1999-06-28
State Bureau of Machinery Industry
Implementation on 2000-01-01
JB/T7939-1999
This standard was formerly the national standard GB7933-87 "Bore and rod area ratio of single-piston rod hydraulic cylinders". After the cleanup and rectification of machinery industry standards in 1994, it was downgraded to the industry standard JB/T793995 "Bore and rod area ratio of single-piston rod hydraulic cylinders". During the review of the standard in 1997, it was determined that the standard should be modified in accordance with the equivalent 1SO7181:1991 "Ratio of area of ​​cylinder bore and piston rod in hydraulic transmission". The main modifications are as follows: 1) The cylinder bore diameter "20" and the corresponding parameter values ​​are cancelled in Table 1. 2) The cylinder bore diameter "(280), (360), (450)" and the corresponding parameter values ​​are added in Table 1. 3) The area standard ratio "1.32)" and the corresponding parameter values ​​are cancelled in Table 1. 4) Editorial modifications are made in accordance with GB/T1.1-1993. This standard was proposed and managed by the National Hydraulic and Pneumatic Standardization Technical Committee. The main drafting unit of this standard is the Beijing Institute of Automation of the Machinery Industry, Ministry of Machinery Industry. The main drafters of this standard are Liu Xinde and Zhao Manlin. JB/T7939-1999
ISO Foreword
ISO (International Organization for Standardization) is a worldwide alliance of international standardization bodies (ISO member bodies). The work of preparing international standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be admitted to that committee. International organizations, governmental or non-governmental, in liaison with ISO also take part in the work. ISO collaborates closely with the International Commission for Electrical Standardization (IEC) in the field of electrical standardization.
Draft international standards adopted by technical committees are circulated to the member bodies for voting. Publication as an international standard requires approval by at least 75% of the member bodies voting.
International Standard ISO 7181 was prepared by "ISO/TCI 31/SC 3, Technical Committee Fluid Power Systems, Subcommittee 3 - Cylinders". This second edition repeals and replaces the first edition (1507181:1982), to which it has been technically revised. Annex A to this international standard is for information only.
JB/T 7939-1999bzxZ.net
In hydraulic transmission systems, power is transmitted and controlled by means of pressurized fluid in a closed circuit. The hydraulic cylinder is one of the components of this type of system. It is a device that converts power into linear mechanical force and motion. The hydraulic cylinder consists of some moving elements, namely: a piston and a piston rod running in the cylinder. Mechanical Industry Standard of the People's Republic of China
Ratio of the two chambers of a single piston rod hydraulic cylinder
Hydraulic fluid power-Cylinders-Bore and rod area ratiosScope
JB/T7939-1999
eqv1so7181:1991
This standard specifies the standard ratio of the effective areas of the two chambers of a single piston rod hydraulic cylinder corresponding to the cylinder bore diameter D and the piston rod diameter d. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard by reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T2348-1993 Hydraulic and pneumatic systems and components Cylinder inner diameter and piston rod outer diameter 3 The area ratio of the two chambers of the hydraulic cylinder
The dimensions are shown in Figure 1 and Table 1. The cylinder inner diameter and piston rod outer diameter conform to GB/T2348. 3.1 For the two chambers corresponding to the hydraulic cylinder inner diameter D and the piston rod diameter d, there is a corresponding ratio Φ between their effective areas A, and A,. 4
In the formula:
\(D2-d2).
3.2 For each D value, this standard gives a series of standard values ​​of d so that the area ratio Φ formed is roughly equivalent to one of the following priority numbers:
1.06—1.121.25-1.4—1.6---2—2.5-53.3 For each pair of diameters (D, a), Table 1 gives the calculated values ​​of A, and A, and the corresponding actual values ​​of Φ. 9
Approved by the State Machinery Industry Bureau on June 28, 1999 and implemented on January 1, 2000
JB/T7939-1999
（09)
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