The scope of use is more and more extensive. For the basis of bearing selection in the motion mechanism of the machine, there are more theoretical knowledge in the related books, and there are fewer typical examples of contact with the actual. This paper is based on the star type in the series of star air compressors developed by our factory, and the parent machine of Jia 310 is the blueprint. The life expectancy of the bearing of the machine is systematically explained. The advanced data used in the calculation is used to calculate the thermal power of the machine. Calculate the book and the relevant calculation results are given in the form of radar. The results obtained are intuitive and can be compared with each other in the bearing life of the machine, or can be compared to similar models.

Project project parameter pressure, 3 compression shaft power, let the use of knowledge, 1 program, compile and calculate the thermal calculation book power calculation book. Since this paper deals with the calculation of the tangential force normal force, only the main calculation formulas are listed here.

Piston force at all levels.

Force; level reciprocating friction.

The direction of the above forces is the algebraic sum of the forces acting on the center line of the cylinder of the stage.

Acting at the crank pin at the tangential force 7.

Crank corner 1. Use, 1 program, you can use the discrete method, every 5, enumerated to calculate 0.5.10355, a total of 72 states.

Acts on the normal force of the crank pin.

Find the total tangential force 7 total normal force 6.

According to the cylinder arrangement of the model, 1. Take the stage cylinder as the reference column, and only the stage cylinders advance the phase angle of 90180270 respectively, and then superimpose each other to obtain the total total normal force of the total tangential force and the function of the corresponding rotation angle 0.

1 Bearing life estimation This machine uses 10 bearings, respectively, 2 6310 ball bearings, used as the main bearing; 4 6312 ball bearings, used as the connecting rod big head rotating pair; 4 6906 needle roller bearings, used As the connecting rod small head rotating pair.

The calculation principle for the life of each bearing is to first find the tangential force at the axial center. 7 Normal force and its combined force are also the dynamic load when the bearing actually acts. There are 72 sets of data, and the size and direction are changed. of. The average equivalent dynamic load is the classic formula for reusing the bearing life expectancy. The bearing dynamic load rating, load factor, here = household, find the estimated life of each bearing. The results of the data can be used to compare 10 bearings.

1.1 Main bearing 6310 bearing life estimation According to the dynamic calculation of this model, the total tangential force 7 total normal force gauge is obtained by combining the crank pin. Data, the results are given in the form of radar, 2.

Considering the synthesis of the reciprocating inertial force of the column, a part of the rotating mass needs to be set after the internal and external balancing, but it has been balanced with the step reciprocating inertial force, but the step reciprocating inertial force is not considered. For the crankshaft itself, the rotational masses of the various parts are balanced with each other, and since the axial distance of each part is small, it can be regarded as a particle processing. Therefore, the calculation of the main bearing load does not take into account the rotational inertia force when the crankshaft is not used as a mass point, so the treatment is worth considering.

No correction is made to the normal force data.

The tangential force data should be corrected. Here, the rotational friction at each end takes the total friction force. 10. The corrected tangential force plus the rotational friction force, the rotational friction force is 0.10, 0.26=0.05.

Using the crankshaft force provided below, 3, column balance equation, the tangential force is obtained, so the normal force is 6310 ball bearing at the end of the bearing seat.

The result of private = 0.46 ft.

Find the result 5.

According to the tangential force normal force data of the respective columns, considering the respective rotational frictional forces, the rotational friction force of each column here takes the total frictional force of 10. The corrected tangential force plus the rotational frictional force.

The correction of the normal force data should take into account the difference in the mass of the rotation of the common connecting rod and the split connecting rod. Because the inner and outer rings of the ball bearing are relatively rotative motion, they also move in the circular motion along the main axis, so it is necessary to The normal force is corrected, that is, the 2.39 pair of split rods for the ordinary connecting rod is 2.93 centrifugal force, and the mass here includes the mass of the outer ring of the ball bearing. All of these considerations are to calculate the instantaneous value in any state as accurately as possible.

6312 ball bearings at the head of the 3rd grade ordinary connecting rod.

The result obtained by the ruler = ruler + 1.06.

6312 ball bearings at the head of the 4th grade ordinary connecting rod.

Find the result 7.

Shear force + mana combined force 5 two-stage splitting link 6312 ball bearing at the big end.

The centrifugal force of the big rod of the connecting rod is similar in force, but the force of the connecting rod bearing is obviously larger.

The split-section connecting rod is larger than the ordinary connecting rod, but it improves the uniformity of the force. Therefore, the bearing life is 1.3. The connecting rod life of the 1.3-pin small-head rotating sub-RNA6906 needle bearing is estimated to be used only for this model. Needle roller bearing ruler 69066, only for level, only for level, the calculation is based on the maximum link force of each column. From the corresponding, program, the calculated maximum link force is 4.7603, and the minimum piston force is 1.64. Pull 1.17; the average equivalent dynamic load is 2.64 7.041 respectively.

23. Check the relevant manual, you can take 0 = 7 piston force; only the small end of the connecting rod is the 6906 needle roller bearing.

Only the small end of the level link is only 6906 needle roller bearings.

2 Conclusions The shortest bearing life of the bearing is the 6312 bearing of the large-size connecting rod, which is about 7300 hours. The longest is the small-necked 6906 needle roller bearing of the grade connecting rod, which is about 196,000 hours. When the product is designed according to general requirements, the difference in functions is quite large. If the bearing life of the 6312 is improved, the diameter of the cylinder can be reduced and the pressure between the stages can be increased, but it is possible to make the temperature difference of the exhaust gas too large.

The specific life values ​​of the bearings given here are relative, and the actual distribution of the grease-lubricated load is uneven, and the reliability of the bearing itself is different. These data can also be analogized to similar air compressors with similar structural parameters.

According to the principle of designing the same life of mechanical parts, this paper gives the radar about the tangential force normal force and its resultant force, which provides a basis for the improvement of the thermodynamic parameters.

1 Lin Mei, Sun Yuying. Principle of piston compressors. Xi'an Jiaotong University has 12 Chen Yongjiang. Principle and structural design of positive displacement compressors. Xi'an traffic mainland Pengcheng. Star compressor air compressor crankcase anchor bolt fracture analysis several compressors Yang Ke frame, Cheng Guangyun. The basis of mechanical design is called. Higher Education Press, 5 Songlin. The latest bearing manual Beijing, Electronic Industry Press, 2007, graduated from the School of Electric Engineering, now the People's Liberation Army's first factory engaged in compressor research work, engineers. Contact address 246000 Anqing City, Anhui Province, the People's Liberation Army, the first plant. phone

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