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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>Shaft and bearing drawing of hydraulic excavator working equipment (2) Hydraulic excavator working equipment shaft and bearing depiction (2)
Second, the depiction of the axis: /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
(1) Under normal circumstances, the material of the shaft is made of high-quality carbon structural steel of 35# or above; it can also participate in the thermal treatment function of the alloy elements; the data can be treated after quenching, quenching and other external treatment; Compared with the ambition, when there is a hard object intrusion; the hard object can be embedded in the bearing; without damaging the shaft, otherwise the fatigue life of the shaft will be reduced.
(2) When the outer surface roughness of the shaft is large; the protruding part of the shaft and the sleeve will block the oil film; form a direct touch between the two; thus; improve the appearance roughness of the shaft; minimize the oil film gap; make it close to the fluid smooth Condition; this will improve the life of the bushing; usually the outer surface roughness of the shaft should be in Ral. 6 or more.
(3) Electroplating the shaft that does not accept the alternating load; not only can it improve its corrosion resistance; and it can be useful to avoid rough wear;
Third, the shaft and bearing public service cooperation:
Under normal circumstances; the outer ring of the bearing and the structural member are medium-sized press-fit cooperation; the inner ring of the bearing and the shaft cooperate with the gap made by the base hole; the inner ring of the bearing has an oil groove; smooth grease is smooth. The shaft and the bearing The cooperation gap is too large; there is a large impact load; it seriously affects the service life of the shaft and the structural member, and the cooperation gap between the shaft and the bearing passes. The 蚰岩å•çº¬æ™Œæ¦·Ç–å¨œè ¡ãƒå‡°å²·å²·å²·å²¢å²¢æ¹Ž 湎 湎 㤠㤠㤠晌榷ǖ 晌榷ǖ 晌榷ǖ 晌榷ǖ è ¡ã• èµ¡è‰¿ 赡艿 赡艿 赡艿 赡艿 赡艿 赡艿 赡艿 赡艿 赡艿 赡艿 赡艿 赡艿 赡艿 赡艿 赡艿 赡艿 赡艿 赡艿 赡艿 赡艿 . . . . . . h h h h h h h h h h h h h h h h h h
Hs: minimum oil film thickness (mm)
Y12: Relative flexural deformation of the two faces of the bearing Ra1: Surface roughness of the shaft Ra2: Surface roughness of the bearing â–³L: Straightness of the shaft in the bearing â–³D: Roundness of the inner ring of the bearing â–³: Bearing after installation The amount of bore reduction is now calculated for the minimum cooperation gap between the shaft and the bearing of the XCMG 220LC-6 type maneuvering arm and the arm joint:
When the diameter of the shaft with a diameter of 90 is the minimum thickness of the oil film thickness hs=6 (μm); the deflection of the shaft is analyzed: the system pressure of the hydraulic system is: 31. 4 × 106 Pa; the cylinder diameter of the cylinder is 140 mm.
The thrust of the cylinder is: F = π × 70 × 70 × l0-6 × 31. 4 × 106 = 4. 8 × 105 (N)
According to the force analysis of the stick; Pl = P2 = 3. 06 × l05; then Rl = R2 = 3. 06 × 105;
The force of the shaft can be simplified as a symmetric dispersion of the load of the shaft; now when X is at (0 207); the equation of the moment is M(x)=R1×X-××(X-37)×(X-37) Then Y(X)=??+cx+D=
?-+x-x?+Cx+D
From X=0; Y(x)=0 is obtained: D=0; X=0; θ(x)=0 is obtained: c=0
So: Y(x)=×?-+X-X?
Where E=270 (GPa)
I=×D4=×(180)4=5. 15×107(mm4)
y(37)==7. 5×10-7(mm)
Y(157)==6. 7×10-5(mm)
So; Y12=Y(157)-Y(37)
.6.625×10-5(mm)
The outer surface roughness of the shaft is Ra1=1.6(μm)
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Source: China Bearing Network Time: 2018-04-26