JB/T 6041-1992 Technical requirements for gear pairs of main reducers of drive axles of wheeled engineering machinery
Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T6041--92
Drive axle of wheeled engineering machinery
Main reducer gear pair
Technical conditions
Published on 1992-05-28
Implementation of the Ministry of Machinery and Electronics Industry of the People's Republic of China on 199301-01
Mechanical Industry Standard of the People's Republic of China
Drive axle of wheeled engineering machinery
Main reducer gear pair
Technical conditions
1 Subject content and scope of application
JB/T6041--92
This standard specifies the technical requirements, test methods and inspection rules for the main reducer gear pair of the drive axle of wheeled engineering machinery. This standard applies to the Gleason gear pair (hereinafter referred to as the gear pair) of the main reducer of the drive axle of wheeled engineering machinery. Reference standards
GB3478.1～3478.2 Cylindrical spur involute spline GB8539
GB11365
JB/T5928
JB/T5929Www.bzxZ.net
JB/T5942
JB/T5944
Technical requirements
General provisions for inspection of gear materials and heat treatment quality Bevel gear and hypoid gear accuracy
Bench test method for drive axle of engineering machinery
Reliability test method for drive axle of engineering machinery General technical conditions for free forgings of engineering machinery General technical conditions for heat-treated parts of engineering machinery Products shall comply with the requirements of this standard and be manufactured in pairs according to the drawings and technical documents approved by the prescribed procedures. 3.1
General requirements
The materials of gear pairs shall be able to meet the performance requirements of the main engine. The materials in Table 1 are recommended. Table 1
Driving gear
Driven gear
Gear material
16CrNi3H;20CrMnTi
20CrNiMoH;20CrMnTi
The materials used should be accompanied by a quality certificate, and physical and chemical tests should be carried out before production, and they can only be used after being confirmed to be qualified. Tooth forgings should comply with the provisions of JB/T5942. 3.2 Heat treatment and surface treatment
Gears should be carburized and quenched, and meet the following requirements: Tooth surface hardness 5863HRC;
Tooth core hardness 31~39HRC;
Thread part hardness 35~42HRC;
Metallurgical structure should comply with the provisions of JB/T5944: The depth of the effective carburized hardened layer should comply with the provisions of Table 2. Approved by the Ministry of Machinery and Electronics Industry on May 28, 1992, and implemented on January 1, 1993
> 6.35~8.47
>8.47~12.70
> 12.70~16.90
JB/T6041--92
Table 2 Effective carburizing hardening layer depth
Carburizing layer depth
1.40~1.75
1.70~2.00
The gear surface should be phosphated.
The phosphating film thickness is 612um. If the phosphating film causes dimensional changes, it should be within the allowable tolerance range of the parts, and the roughness should meet the requirements of a.
and the part drawing;
b. The surface of the phosphate coating should be gray or dark gray, with fine and uniform crystals, and no rust, impurity deposition, fingerprints or other defects. 3.3 Gear Accuracy
The gear accuracy is grade 8.
The gear ring runout tolerance F, value should comply with the provisions of Table 3. Table 3 Gear ring runout tolerance F value
Midpoint pitch circle diameter
～100
>100~200
>200~400
Note: R in the table represents the pitch circle diameter,
Tooth side clearance
Driving gear
Calculated at 0.04/R50
Calculated at 0.04/R50
Driven gear
Calculated at 0.05/R100
Should comply with the requirements of grade 8 accuracy in Table 4 of GB11365. The minimum normal backlash imi should comply with the requirements of Table 4. Table 4 Minimum normal backlash
> 6.35 ~7.26
>7.26~ 8.47
>8.47~10.16
>10.16~12.70
>12.70~14.51
>14.51~16.90
Note: For gear pairs with special requirements for minimum normal backlash, the product drawings of the manufacturer can be followed. The backlash variation difference Fri value should comply with the requirements of grade 9 accuracy in Table 9 of GB11365. b.
Tooth side clearance
0.178~0.229
0.203~0.279
0.254~0.330
0.305~0.400
0.356~0.457
0.406~0.559
When the gears are paired, the correction of the installation distance of the active gear should meet the design requirements, generally not exceeding ±0.3mm. Gear pair contact accuracy
The contact spot of the tooth surface is 40%~70% of the working tooth height along the tooth height direction and 35%~65% of the tooth length along the tooth length direction. The contact spot of the working tooth surface must be controlled in the middle of the tooth towards the small end, preferably 2~7mm away from the small end, and the contact spot of the non-working tooth surface must be controlled in the middle of the tooth.
JB/T6041-92
Contact spots on tooth surface, no diagonal contact, eccentric contact, small end or large end contact, tooth top or tooth root contact, etc. and free phenomenon are allowed (see the tooth top below
Ideal contact under light load (qualified)
Small end contact
Tooth root contact
Wide contact
Long contact
Inner diagonal contact
Large end contact
Tooth top contact
Traction contact
Short contact
Ideal contact under full load (qualified)
Angled contact
Tooth top contact
Intermittent contact (along tooth height)
Intermittent contact (along tooth length)
Outer diagonal contact
Gear contact spot shape and position diagram| |tt||The tooth surface roughness shall meet the following requirements:
Milling or round drawing: Ra value is 2.5um.
Tooth: Ra value is 1.25μm.
3.4 Geometric dimensions and position accuracy of various gear parts 3.4.1
Driving gear
The dimensional accuracy of the journal that matches the bearing shall not be less than IT6; the coaxiality accuracy of each journal shall not be less than grade 7; the end face runout of the mounting end face to the axis of the part shall not be less than grade 7; the involute spline tooth side matching accuracy shall not be less than the 6-grade accuracy specified in GB3478.1 and GB3478.2; the internal and external thread tolerance zones shall use H/g matching. The tolerance grade shall not be less than grade 6. Driven gear
a. The dimensional accuracy of the positioning hole shall not be less than IT7; JB/T6041---92
b .The warpage of the bearing end surface, calculated according to the outer radius, shall meet the following requirements: external warpage ≤0.045/R100mm, internal warpage ≤0.09/R100mm; C. The position of the fastening hole or threaded hole shall not be greater than 1/2 of the clearance between the hole and the stud. 3.5 Appearance quality
3.5.1 The gear surface shall be smooth and free of cracks, sharp edges, burrs, and defects such as rust, black skin, pits and bumps on the working surface. 3.5.2 The threaded part shall be free of bumps, missing teeth, partial shedding and other symptoms. 3.6 No-load noise of gear pair
The gears shall run smoothly without abnormal noises such as impact and vibration. The sound power level of the no-load noise of a single gear shall not be greater than 86dB(A)3.7 Reliability and quality assurance
3.7.1 The average service life of the gear pair shall not be less than 6000 h. 3.7.2 Under the condition of correct use and storage by the user, within 12 months from the date of leaving the factory, if the gear fails due to manufacturing reasons, the manufacturer shall be responsible for returning it.
4 Test method
4.1 Test conditions
4.1.1 The accuracy of the equipment, instruments, measuring tools and meters used for testing should meet the test requirements and have a valid certificate issued by the metrology authority.
4.1.2. The test site should be a workshop inspection station or a special laboratory with low environmental noise. 4.2 Material and heat treatment inspection
Gear material and heat treatment inspection. It should comply with the provisions of MQ grade in CB8539. The carburized layer depth, core hardness and metallographic structure should be cut and inspected or an inspection report of the same furnace test block or the same furnace test piece should be provided. 4.3 Surface phosphating inspection
The surface phosphating quality inspection adopts the visual inspection method. 4.4 Gear ring runout measurement
Use a ball head comparator with a probe tangent to the two tooth sides to measure several tooth grooves for comparison, and take the difference between the two limit readings. 4.5 Tooth side clearance measurement
4.5.1 Measure the minimum normal side clearance, lock the driving gear on the mandrel, and make the sub-meter probe point vertically to the large end tooth surface of the driven gear, find the minimum clearance meshing point, and take the minimum value. 4.5.2 Measure the side clearance variation, adopt the method of Article 4.5.1 of this standard, measure the maximum and minimum values and take the difference. 4.6 Gear contact accuracy test
Install the gear on the gear rolling inspection machine, apply dyeing material on the tooth surface, and when the gear is running, slightly brake the driven gear, and contact spots will appear on the tooth surface.
4.7 Determination of gear no-load noise
The no-load noise of a single pair of gears shall be measured in accordance with the provisions of JB/T5928. 4.8 Life test
The gear life test shall be carried out in accordance with the provisions of JB/T5929, and can also be carried out with the main engine for driving and operation tests. 4.9 Appearance quality inspection
The appearance quality inspection of gears shall be carried out by visual inspection. 5 Inspection rules
5.1 Each product shall be inspected and qualified by the inspection department of the manufacturer before it can be shipped out of the factory, and a product quality certificate shall be attached when it leaves the factory. 5.2 Factory inspection
5.2.1 Factory inspection items
Material inspection;
Heat treatment and surface treatment inspection;
Gear accuracy inspection;
JB/T6041--92
Gear geometric dimensions and position accuracy inspection of each part; no-load noise measurement of gear pairs;
Appearance quality inspection.
Type inspection
Type inspection methods shall be in accordance with the provisions of Chapter 4 of this standard and meet all the requirements of Chapter 3 of this standard. Gear pairs shall be subject to type inspection in any of the following circumstances: when new products are identified and finalized or when products are transferred to other factories for production; when there are major changes in design, process, and materials that affect product performance; G.
When production resumes after two years of suspension;
When the national quality supervision agency proposes type inspection requirements. D.
5.4 Sampling method and judgment principle
Type inspection shall be conducted by random sampling from qualified products. The sampling plan shall be agreed upon by the supply and demand parties or determined by the superior quality supervision department based on the production batch. 8 Judgment principle
After the sample undergoes type inspection, if it does not meet the requirements of this standard, it is allowed to double the sampling in the same batch of products, re-inspect the unqualified items, and the results of the repeated inspection shall be used as the final inspection conclusion. 6 Marking, packaging, transportation, storage
6.1 Marking
Each product should be marked with:
trademark or factory code;
b. part number and pairing number;
c. transmission ratio;
d. installation distance correction.
The location, size and method of marking shall be in accordance with the product drawings. Care should be taken not to damage the working surface of the parts. 6.2 Packaging
Products should be cleaned before packaging, then treated with rust prevention and wrapped with waterproof materials. Each pair of gears should be accompanied by a certificate of conformity stamped by the inspector of the manufacturer's inspection department. 6.2.3 Products should be packed in dry wooden boxes lined with waterproof materials, and ensure that they will not be damaged during normal transportation. The wooden box should be accompanied by a packing list, indicating the product name, model, part drawing number, quantity and packing date. 6.2.42
The outside of the wooden box should be marked with transportation marks in accordance with relevant transportation regulations. 6.2.5
6.2.6If the ordering unit agrees, a simple packaging method can be used. 6.3 Transportation
Product transportation must comply with the loading requirements of land and water transportation, and should not be bumped during transportation. 6.4 Purchase and storage
The product should be stored in a dry and ventilated warehouse, and there should be no corrosive substances or gases indoors. Under normal circumstances, the product will not corrode within 2 months from the date of leaving the factory.
Additional instructions:
JB/T6041---92
This standard was proposed and managed by the Tianjin Engineering Machinery Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Tianjin Engineering Machinery Research Institute of the Ministry of Machinery and Electronics Industry and Xuzhou Gear Factory. The main drafters of this standard are Chen Fenglan, Wang Wenzhang, Yu Zongkui, and Wang Suqin.
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