Hydraulic gear pumps
1 Scope
This standard specifies the basic parameters, technical requirements, test methods, inspection rules, marking, packaging and other requirements of hydraulic gear pumps (hereinafter referred to as “gear pumps”).
This standard is applicable to the gear pumps with hydraulic oil or other liquids with equivalent performance as the operating medium.
Note: The gear pumps involved in this standard are external gear pumps.
2 Normative references
The following normative documents contain provisions which, through reference in this standard, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections) to, or revisions of, any of these publications do not apply to this standard. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition applies.
GB/T 786.1 Fluid power systems and components - Graphic symbols and circuit diagrams - Part 1: Graphic symbols (GB/T 786.1-1993, eqv ISO 1219-1:1991)
GB/T 2346 Fluid power systems and components - Nominal pressures (GB/T 2346-2003, ISO 2944:2000, MOD)
GB/T 2347 Hydraulic fluid power - Pumps and motors - Geometric displacements (GB/T 2347-1980, eqv ISO 3662:1976)
GB/T 2353 Dimension series and identification code for mounting flanges and shaft ends of hydraulic pumps and motors (GB/T 2353-2005, ISO 3019-2:2001, MOD)
GB/T 2828.1 Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection (GB/T 2828.1-2003, ISO 2859-1:1999, IDT)
GB/T 2878 Fluid power systems and components - Ports - Dimensions and design (GB/T 2878-1993, neq ISO 6149:1980)
GB/T 7935-2005 Hydraulic fluid power - General requirements for hydraulic components
GB/T 7936 Hydraulic fluid power - positive displacement pumps and motors - Determination of derived capacity
GB/T 14039-2002 Hydraulic fluid power - Fluids - Method for coding the level of contamination by solid particles (ISO 4406:1999, MOD)
GB/T 17446 Fluid power systems and components - Terminology (GB/T 17446-1998, idt ISO 5598:1985)
GB/T 17483 Test code for the determination of airborne
noise level of hydraulic pumps (GB/T 17483-1998, eqv ISO 4412-1:1991)
JB/T 7858 Method to determine cleanliness and acceptance criterions for hydraulic components
3 Terms and definitions
For the purposes of this standard, the terms and definitions given in GB/T 17446 and the following apply.
3.1
rated pressure
maximum output pressure that can ensure the design life by continuous operation within the specified speed range
3.2
derived pressure
output pressure not exceeding 5% of rated pressure or 0.5MPa
3.3
maximum pressure
maximum output pressure allowed for short-term operation
3.4
nominal capacity
nominal geometric capacity of hydraulic pump
3.5
rated speed
maximum speed that can ensure the design life under the rated pressure and specified oil feeding conditions
3.6
minimum speed
minimum speed allowed to keep the output stable at the rated pressure
3.7
rated conditions
operating conditions under rated pressure and at rated speed
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Quantities, symbols and units
5 Basic parameters and marking
5.1 Basic parameters
5.2 Marking
6 Technical requirements
6.1 General requirements
6.2 Performance requirements
6.3 Assembly requirements
6.4 Appearance requirements
7 Test methods
7.1 Test apparatus
7.2 Test conditions
7.3 Test items and methods
7.4 Test data processing and result expression
8 Inspection method of assembly and appearance
9 Inspection rules
9.1 Inspection classification
9.2 Sampling
9.3 Judgment rules
10 Marking and packaging
Annex A (Informative) Test circuit and characteristic curve
A.1 Test circuit
A.2 Characteristic curves
A.3 Shock waveform
Figure A.1 Schematic diagram of open test circuit
Figure A.2 Schematic diagram of closed test circuit
Figure A.3 Curves of power, flow and efficiency with speed
Figure A.4 Curves of power, flow and efficiency with pressure
Figure A.5 Shock waveform
Table 1 Quantities, symbols and units
Table 2 Volume efficiency and total efficiency of gear pump
Table 3 Noise value of gear pump
Table 4 Internal cleanliness index of gear pump
Table 5 Allowable range of average display value of controlled parameters for gear pump
Table 6 Allowable error of measurement system
Table 7 End-of-manufacturing test items and methods of gear pump
Table 8 Type test items and methods of gear pump
Table 9 Inspection method of gear pump assembly and appearance
