JB/T 7693-1995 Technical requirements for drive shaft assemblies for loaders
Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T7693-95
Drive shaft assembly for loaders
Technical conditions
Published on 1995-06-20
Ministry of Machinery Industry of the People's Republic of China
Implemented on 1996-01-01
Mechanical Industry Standard of the People's Republic of China
Drive shaft assembly for loaders
Technical conditions
1 Subject content and scope of application
This standard specifies the technical conditions of cross-axis universal joint drive shaft assembly (hereinafter referred to as drive shaft). This standard applies to drive shafts for loaders, and can also be used as a reference for drive shafts for other engineering machinery. 2 Reference standards
GB2828
GB9239
GB9947
JB3741
JB/T5945
ZBJ11014
ZBJ85018
3 Technical requirements
Counting sampling procedure and sampling table for batch inspection (applicable to inspection of continuous batches) Determination of the balance quality of rigid rotors and the allowable unbalance Electric welded steel pipes for drive shafts
Technical conditions for automobile universal joint cross shafts
Bench test methods for automobile drive shaft assemblies
General technical conditions for engineering machinery assembly
Technical conditions for universal joint needle roller bearings
Double universal couplings for crawler bulldozers
3.1 The drive shaft shall comply with the requirements of this standard and be manufactured in accordance with the drawings and technical documents approved through the prescribed procedures. 3.2 Universal joint needle bearings shall comply with the relevant provisions of ZBJ11014. 3.3 Universal joint cross shafts shall comply with the relevant provisions of JB524 and ZBJ85018. 3.4 The steel pipe for the transmission shaft shall comply with the relevant provisions of GB9947 JB/T769395
3.5 The welding quality of the transmission shaft pipe welded parts shall be reliable, the weld appearance shall be flat, smooth and uninterrupted, and there shall be no defects such as cold welding and slag inclusion. When statically twisted with twice the maximum working torque, the weld shall not crack. 3.6 Before assembling the transmission shaft, all parts shall be cleaned and meet the following requirements: a. The oil passage of the cross shaft should be clean and unobstructed, and the needle rollers in the bearing bowl should not be less than the required amount: b. After the universal joint assembly is assembled, the bearing should rotate flexibly and the seal should be intact: c. The transmission shaft tube welding parts should be straightened before and after welding. The radial runout of the sliding shaft and non-sliding shaft journal should be less than 0.10mm, and the radial runout on the entire length of the shaft tube should comply with the provisions of Table 1. When the shaft tube length is less than 1.5 times the shaft tube diameter, the radial runout of the sliding shaft and non-sliding shaft journal should be less than 0.20mm, and the radial runout of the entire length of the shaft tube should be less than 0.50mm; d. The transmission shaft tube, sliding shaft, universal joint fork, decay tube fork, and flange fork shall not have cracks. 3.7 The appearance of the transmission shaft and the surface of the parts shall not have defects such as burrs, bruises, rust, creases, distortions, and cracks. Table 1
Length of transmission shaft tube welding parts
Radial runout of shaft tube
Approved by the Ministry of Machinery Industry on June 20, 1995
≤1000
Implemented on January 1, 1996
JB/T 769395
3.8 No missing or wrong assembly during assembly: The oil filling cup on the cross shaft and the oil filling cup on the sliding fork should be on the same side; the fasteners should be firmly and reliably connected, and their tightening torque should comply with the relevant provisions of Appendix A of JB/T5945. 3.9 After the transmission shaft is assembled, when it is rotated by hand in the forward and reverse directions along the conical surface motion trajectory formed by the maximum angle of the universal joint, the universal joint should work smoothly without any jamming or obvious gap, and the angle of the universal joint should meet the design requirements; the sliding shaft and the sliding fork should be able to slide axially within the working length range required by the design, and there should be no jamming. 3.10 The directional joints at both ends of the transmission shaft should be on the specified phase plane. The difference is 2°~3°. 3.11 The verticality of the common axis of the two bearing holes of the universal joint fork and the sleeve fork to the axis of the transmission shaft should be less than 0.20mm, and the coaxiality of the two bearing hole axes should be less than 0.01mm. bzxz.net
3.12 The transmission shaft should be subjected to dynamic balancing test after assembly. The balancing plates welded at both ends of the transmission shaft should be firm and reliable. There should be no more than 3 plates at each end, and the residual unbalance should not be less than the allowable unbalance of the G16 balancing quality grade transmission shaft specified in GB9239. See Appendix A (reference) for an example of calculation.
3.13 The critical speed of the transmission shaft should be greater than 1.5 times its actual maximum speed. 3.14 The safety factor n of the static torsional strength of the transmission shaft should be calculated according to formula (1), and its value should be greater than 2. M,
Where: \,---Safety factor:
M,--static torsional torque of the transmission shaft, N·m; Mma
Rated load torque of the transmission shaft, N·m. +(1)
3.15 When the transmission shaft is subjected to the impact strength test, when the hammer falls freely from a height of 1.25m, the transmission shaft should not be broken or damaged. 4 Test method
The residual unbalance, critical speed, static torsional strength, impact strength and other tests of the transmission shaft shall be carried out in accordance with the relevant provisions of JB3741. 5 Inspection rules
5.1 The transmission shaft shall be inspected and qualified by the quality inspection department of the manufacturer before it can be shipped out of the factory. The transmission shaft shipped out of the factory shall be accompanied by an inspection certificate. 5.2 Factory inspection
5.2.1 The residual unbalance of the transmission shaft shall be fully inspected and shall comply with the provisions of 3.13 and the special requirements of the purchaser. 5.2.2 The inspection of other items of the transmission shaft shall be carried out according to the one-time sampling plan specified in GB2828. The qualified quality level (AQL) of the transmission shaft is 4, the inspection level is the general inspection level 1, and the sample size code electric manufacturer shall select it according to the production batch according to Table 2 of GB2828 or negotiated and determined by the supply and demand parties. The specific inspection items shall be selected by the manufacturer according to the requirements of Chapter 3 or negotiated and determined by the supply and demand parties according to the actual situation.
5.3 Type inspection
5.3.1 The transmission shaft shall be subjected to type inspection in the following cases: a. New trial production or transfer production of the transmission shaft; b. After formal production, the structure, material, and process have changed significantly, before mass production; c. Periodic regular inspection.
5.3.2 Type inspection shall be carried out in accordance with all the items specified in JB3741 and shall comply with Chapter 3 of this standard and the special requirements proposed by the purchaser.
6 Marking, packaging, transportation and storage
6.1 Marking
6.1.1 The transmission shaft shall be marked on the shaft tube;
a. Manufacturer's name or registered trademark
b. Product name and model
6.2 Packaging
JB/T 769395
Before packaging, the transmission shaft shall be cleaned and coated with anti-rust oil on the non-coated outer surface, and then wrapped with plastic film and linen. 6. 2.1
When packing, the packing list and product certificate shall be included at the same time. 6.2.2
The packaging box should be marked with:
Manufacturer name or factory logo;
Product name and model;
Collection unit and address;
Packing quantity:
"Handle with care", "Beware of moisture and mixing"; Year and month of production.
6.3 Transportation
The transmission shaft should be protected from strong impact, vibration and water splashing during transportation. To prevent the transmission shaft from accidentally spreading or falling in the axial direction during transportation, it can be tied with fine steel wire or with suitable stands and supports. 6.4 Storage
The transmission shaft should be stored in a ventilated, dry warehouse without corrosive gas. To avoid being damaged by the environment, etc., suitable stands and supports can be used. Under normal storage, if rust occurs within half a year from the date of production, the manufacturer shall be responsible. 3
JB/T7693-95
Appendix A
Calculation example of permissible unbalance of transmission shaft (reference)
Example: The mass of a transmission shaft is 20kg, the maximum operating speed is 3000r/min, and the balancing quality grade is G16. Calculate the permissible unbalance Uarrs
Solution 1: According to GB9239, the calculation formula of the mass and permissible unbalance of the transmission shaft, the balancing quality grade and the operating speed and the allowable unbalance degree is:
Where: e--permissible unbalance degree of the transmission shaft g·mm/kg+Ur--—permissible unbalance degree of the transmission shaft.g·mm; M transmission shaft mass.kg.
G balancing quality grade, m m/s:
operating angular velocity of the transmission shaft, rad/s,
MX1000
GM×1000
16×20×1000×60
2 yuan×3000
=1018.59(gmm)
so the allowable unbalance at each end is 1018.59×（1/2）=509.3g·mm=50.93g*cm, (A1)
Solution 2: According to Figure 2 of GB9239, find the corresponding em52μm0.052mm
Urr=eprM
=0.052×20×1000
=1040(g·mm)
So the allowable unbalance at each end is 1040×(1/2)-520g·mm=52g·cm. Additional Notes:
This standard was proposed and coordinated by the Tianjin Engineering Machinery Research Institute of the Ministry of Machinery Industry. This standard was jointly drafted by the Tianjin Engineering Machinery Research Institute of the Ministry of Machinery Industry, Suzhou Quanli Universal Joint Factory and Tianjin Jinhuan Auto Parts Factory.
The main drafters of this standard are Wu Runcai, Yang Yaoxi, Yang Hongming and Zhang Jingui.
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