Replaced by JB/T 9774-2005 JB/T 9774-1999 Cleanliness limits for small and medium power internal combustion engines JB/T9774-1999 Standard download decompression password: www.bzxz.net

[CS27.020
Machinery Industry Standard of the People's Republic of China
JBT9774-1999
Cleanliness limits for small and medium size engines
Internal combustion engines-Cleanliness limits for small and medium size engines1999-09-17 Issued
National Bureau of Machinery Industry
Implementation on 2000-01-01
JB/T 9774--1999
This standard is a revision of N324-84 Cleanliness limits for small ratio internal combustion engines. When revising, in addition to making editorial adjustments to the original standard, the parts on injectors, injection pumps and spray pumps were removed, and the rest of the contents were changed or not. This standard replaces N324-B4 from the date of implementation. Appendix A of this standard is the only appendix of the standard.
This standard was proposed and approved by the Technical Committee for Standardization of Internal Combustion Engines. The authors of this standard are: Shanghai Research Institute, Shanghai Cement Industry Standard Co., Ltd. The main authors of this standard are: Jun Jiang, Wei Daizhen. This standard was first issued in 1984,
Machinery Industry Standard of the People's Republic of China
Cleanliness Limits
Cleaning Limits for Small Aud Middle Power Internal Combustion Engines
[Nternalcomhustionangines
Cicanliness limits for small and medium power internal combustion engines This standard defines the cleanliness limits for small and medium power internal combustion engine products. This standard is applicable to reciprocating internal combustion engines with a power of less than 736kW (10G0 horsepower) - Reference Standards
JR.T:9774-1999
Replacement NJ324--84
The texts contained in the following standards are quoted in this standard or are the provisions of this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard shall discuss the possibility of using the latest versions of the following standards. GR.T3221-1993 Method for determination of cleanliness of small and medium-sized internal combustion engines 3 Determination method
Cleanliness test method According to the provisions of 2.1.2 of GR.T3221-1983, the cleanliness of the whole machine
internal combustion engine cleanliness of the whole machine is expressed in W (mg) per frame, limited to the Jiaan formula (1! Calculation: W-aK.KNIG
Formula: 2-
- Dangerous belt number, 3.mg/kw (10
——Total data quantity engineering coefficient. See table for values": K,:: Speed ​​correction coefficient, see table 2 for values, calibration rate, kW (horsepower)
Compensation amount, mg: See table 3 for values,
Total non-quantity F
Approved by the State Machinery Industry Bureau on 1999-09-17 x.
Total busbar
2000-01-01 Actual
Calibration precision connection bureau
2600-1000
>1000)2000
Calibration power
kw: horsepower
#3.68 (5)
>3.68-7.35 4 5-10 )
>7.35~M.7 1 10-20
5 total or cleaning magic
5.1 carburetor assembly
JB/T9774—1999
Calibration speed
>2000~3
Guide power
50 (two range)
Along [four range]
>14.7-29.4 ( 20-40 )
>29.4-73.53 (40-100 }
>73.53 ( 100 )
The total cleanliness of the carburetor is expressed as the impurity mass W (m), and the limit value is calculated according to formula (2): W.=QIR+G
Where: Formula: k--experienced effective rate, 10mg: k--body code connection coefficient, mg/ctn, the value is shown in Table 4; carburetor volume, m, measured by the method: G compensated to, mg, the value is shown in Table S.
Carburettor volume
For road use
For small crown steam temperature engine
For bee car, boat engine
Note: The compensation value of the oil point for multiple distribution bases is calculated with the lower value. Table 5
5.2 Oil pump assembly
JB/T 97741999
The cleanliness of the engine shaft pump assembly is expressed in mg of impurities per piece. When the engine oil displacement is 90.005L, the limit is 20mg. When the engine oil displacement is 9>0.005L, the limit is calculated by the formula (31): -a+bhkg
Where: empirical constant, 10mg;
-empirical constant, 2xt0mg/L;
K material correction factor, the value is shown in the table:
9-oil pump displacement, L,
The correct formula for the oil pump displacement is shown in Appendix (Appendix 6 of the standard).
Wet material science
Note: The actual surface cleanliness limit of the lubrication system inside the engine is determined by the manufacturer and the parts manufacturer. 5.3 Engine air filter assembly
5.3.1 Winding type, scraper type, paper weight, oil-salt state engine oil filter assembly cleanliness is expressed as each impurity disk (), the limit value is calculated by formula (4):
Wu-aKo
Where: Test value, see table
-Material static positive coefficient, the value is shown in Table 8:
@Default flow, L/mim.
Regulator set flow
Li raie
Bear exhibition materials
5.3.2 The cleanliness of the centrifugal or oil eliminator assembly is expressed as the mass of each impurity, "m", and the limit value is shown in Table 9. 4
Rotor inner diameter α
5.4 Air compressor total skinWww.bzxZ.net
JE/T9774-1999
Medicine drink sugar seat
The cleanliness of the air compressor assembly is calculated in the form of each unit of salt W (), and the limit value is calculated according to (5): Fa(X,KK, +h)
formula: 2-wire test constant, 5Qmg:
, a total row of mother peak positive coefficient, the value is shown in Table 10: K-material positive coefficient, the value is shown in Table 11: K belt shaft end transmission mode correction coefficient, the value is shown in Table 12: The number of transmission pairs on the transmission shaft:
. Table 10
total row of air machine V,
>0.10-0.15
shaft cat transmission type
SS machine Total oil cooler
Total air pressure resistance
>0.15-0.20
11 (excluding turbine)
1.2 (including gear)
The total oil cooler cleanliness is expressed as the mass limit of each piece (m), and the limit is calculated according to formula (6): W.-a+bF.
Where: and b
empirical constants, effective values ​​are shown in Table 13:
-Oil planer heat transfer area, m.
Plate fin type
JB/T 9774—[999
JB/T9774-1999
Appendix A
(Appendix to the standard)
Oil displacement calculation formula
Oil pump displacement (L) formula (AI), formula (A2) Approximate calculation: External blowing full open line gear pump
q==(02 - D) B×10-6
Internal fin gear pump
-)×10~
In the formula: specific tooth circular diameter, mm:
D tooth root original diameter, nn;
Gear length, i
A-—internal rotation long diameter, mm:
A——internal rotation? Minor diameter, mm,
calculated value accurate to 0.0001:
(A2)
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