This standard specifies the type and structural dimensions of the metering holes of small gasoline engine carburetors. This standard applies to small gasoline engine carburetors (including carburetors for mini cars, motorcycles, and mopeds). JB/T 6024-1992 Type and structural dimensions of metering holes of small gasoline engine carburetors JB/T6024-1992 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T 6024-1992
Measuring hole of carburettor for small gasoline engine
Type and structural dimensions
Published on 1992-05-28
Implemented on 1993-01-01 by the Ministry of Machinery and Electronics Industry of the People's Republic of China
Measuring hole of carburettor for small gasoline engine
Type and structural dimensions
Subject content and scope of application
This standard specifies the type and structural dimensions of measuring hole of carburettor for small gasoline engine. JB/T6024-1992
This standard applies to carburettors for small gasoline engines (including carburettors for mini cars, motorcycles, and motorized pedal vehicles). 2 Reference standards
GB1184
GB1804
JB3601
Shape and position tolerancesTolerances and fits for unindicated tolerancesLimit deviations of dimensions for unindicated tolerancesTechnical conditions for automobile carburetors
3 Types and structural dimensions of the orifices
According to the sealing form and structural dimensions, the orifices are divided into seven types: A, B, C, D, E, F, and G. Among them, types A, B, and C are recommended as main orifices; types D and G are recommended as idle orifices; and types E and F are recommended as air orifices. 3.1 The type of type A orifice shall comply with the provisions of Figure 1, and the dimensions shall comply with the provisions of Table 1. The sealing form is end face sealing. ?
Basic diameter D
3.2 The type of type B orifice shall comply with the provisions of Figure 2, and the dimensions shall comply with the provisions of Table 2. The sealing form is end face sealing. Approved by the Ministry of Machinery and Electronics Industry on May 28, 1992 mm
Implemented on January 1, 1993
Basic diameter D
JB/T60241992
3.3The type of C-type measuring hole shall comply with the provisions of Figure 3, and the size shall comply with the provisions of Table 3. The sealing form is end face sealing. Figure 3
Basic diameter D
Note: The series with * is not recommended.
3.4The type of D-type measuring hole shall comply with the provisions of Figure 4, and the size shall comply with the provisions of Table 4. The sealing form is threaded sealing. Figure 4
Basic diameter D
JB/T60241992bzxZ.net
3.5The type of E-type measuring hole shall comply with the provisions of Figure 5, and the size shall comply with the provisions of Table 5. The sealing form is to rely on interference during assembly to seal.
Note: 1) The tolerance of the matching surface is u8
3.6 The type of F-type measuring hole shall comply with the provisions of Figure 6, and the size shall comply with the provisions of Table 6. The sealing form is to rely on the interference during assembly to seal.
Note: 1) The tolerance of the matching surface is u8.
The type of G-type measuring hole shall comply with the provisions of Figure 7, and the size shall comply with the provisions of Table 7. The sealing form is a double seal of thread and cone. 3.7
Nominal diameter
4Technical requirements
JB/T6024-1992
d, dz
4.1The surface roughness parameter R of the inner hole of the measuring hole is 1.6μm. D
4.2The tolerance grade of the external thread of the measuring hole and the internal thread matching the measuring hole is grade 6. The tolerance bands of internal and external threads are: H/g, H/h, G/h. The external thread of the measuring hole is preferably 6h, and the thread is generally a coarse thread. 4.3 The tolerance values ​​of the other dimensions without tolerances except hole d shall not be lower than IT14 grade in GB1804. The shape and position tolerances without tolerances shall be C grade in GB1184. 4.4
The symmetry tolerance value of the center plane of the screwdriver slot of the measuring hole relative to the thread axis of the measuring hole is 0.08mm. The flow value of the measuring hole shall be determined in accordance with the provisions of Articles 3.3, 3.4, and 3.5 of JB3601. The flow angle 61,02 of the measuring hole can be selected from 60°, 90°, and 120°. The value and direction of the flow of the measuring hole shall be marked in the product drawing. The tightening torque when installing the measuring hole is 2~2.5Nm. Measuring hole code
Example: A47±1 means: A-type measuring hole, water flow rate is 47±1mL/min. E50±2 means: E-type measuring hole, water flow rate is 50±2mL/min. Additional remarks:
This standard is proposed and managed by Tianjin Internal Combustion Engine Research Institute. This standard is drafted by Tianjin Internal Combustion Engine Research Institute. The main drafter of this standard is Zhu Di.
People's Republic of China
Mechanical Industry Standard
Measuring hole of carburetor for small gasoline engine
Type and structural dimensions
JB/T60241992
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Sheet 1/2
Format 880×1230
Word count 8,000
First edition in October 1992
First printing in October 1992
Print run 1-500
Price 1.60 yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn66_09
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