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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>Shaft and bearing depiction of hydraulic excavator working equipment Hydraulic excavator working equipment with shaft and bearing depiction
The reliability of the working equipment has a great influence on the whole function of the hydraulic excavator; the working condition of the working equipment is low speed and heavy load; this puts a very high demand on the operation function of the shaft and the bearing; In the middle; the components of the working equipment should be able to describe the functional parameters satisfactorily. Dean Xia Pu 岷 岢 岢 岢 岢 刂匾 刂匾 刂匾 刂匾 刂匾 刂匾 刂匾 刂匾 刂匾 刂匾 刂匾 刂匾 刂匾 刂匾 刂匾 刂匾 刂匾 刂匾 刂匾 刂匾 刂匾 刂匾 刂匾 刂匾 刂匾 刂匾 刂匾Description of the cooperation. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
First, the depiction of the bearing:
The bearing of the working equipment is complex; according to its data, it can be divided into copper bearing, steel bearing, composite bearing, etc. According to its smooth method, it can be divided into dry conflict bearing, oil bearing, incomplete oil film bearing, fluid film bearing, etc.: The smooth method of bearing is used to make the oil film smooth. The copper, steel and copper-based steel are used for self-smoothing. The copper bearing has excellent resistance; the wear resistance is normal; the shaft has good protection; The deformation can be poor; it is easy to deform after long-term use; the bearing inner diameter is expanded; the structural parts are shaken, the steel bearing has high strength; the wear resistance is good; the deformation resistance is strong; but the external heat treatment process demand is high, the copper-based steel back Since the smooth bearing has the advantages of steel bearing and copper bearing; the oil groove is smooth and self-smooth; it can be used to avoid the burning of the bearing; but the process is messy; the cost is higher.
The primary consideration of the bearing is the service life of the bearing; its life is determined by the wear of the inner diameter of the bearing in addition to the scorch. The amount of wear is mainly affected by the conflicting conditions; and the collision is subject to load, speed, impurities, rough appearance. Degree, operating temperature, different working methods, smoothing agents and other conditions; therefore; the amount of wear can only be a theoretical estimate; the life of the bushing depends on various messy conditions. If the oil supply is poor; impurities It is difficult to guess the wear condition when entering, and it is difficult to guess the wear condition. Under normal conditions, the wear of the copper bearing (ZcuAll0Fe3Mn2) can be approximated by the following formula:
W=K×P×V×T
W: wear amount (mm)
K: Conflict coefficient [mm/(N/mm20é¹ /min0é¹”r)]
P: Carrying ability (N/mm2)
V: line speed (m/min)
T: wear time (hr)
Where K=Ci×k; k is the conflict coefficient under ambition; K=(1~5)×10-8[mm/(N/mm20é¹ /min0é¹”r)]
1, Ci = C0 × Cl × C2 × C3
2, bearing pressure P
Generally speaking, the bearing pressure refers to the bearing load receiving load; the maximum load of the bearing support divided by the pressure area; the so-called pressure area; when the bearing is cylindrical; take the projection area of ​​the load direction with the bearing touch.
3, speed V
The heat generated by the bearing; firstly caused by the conflicting effect of the bearing; available on the basis of experience; the rise of the temperature of the conflict surface; the influence of the sliding speed V is much greater than the influence of the bearing pressure P.
It can be seen that the life of the bearing is determined by the value of P×V. The PV value determines the heat generation of the bearing. When the bearing is working, the bearing temperature is affected by the heat and heat generated by the conflict; usually at a certain temperature. Stabilize; if the work continues, there will be impurities intrusion; the function of the smooth oil will decrease; together with the influence of the conflicting powder; the fatigue of the data; the deformation of the conflict surface will change at this moment; the conflict coefficient will improve; the temperature of the bearing will rise; Conflict surface damage; incurs scorch; according to this situation; the lower the working temperature of the bearing; that is, when the low PV value is used; the load of the bearing is better; the life is extended; so the lower PV can be used in the depiction. value.
Second, the depiction of the axis:
(1) Under normal conditions, the material of the shaft should be made of high-quality carbon structural steel of 35# or higher; it can also participate in the improvement of the heat treatment function of the alloy elements; the data can be treated after quenching and tempering, and the hardness exceeds the hardness of the bearing. 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 protrusions of the shaft and the sleeve may block the oil film; forming a direct touch of the two; thus; improving the appearance roughness of the shaft; reducing the oil film gap; making it close to the fluid Smooth condition; this can improve the service life of the bushing; under normal conditions, the outer surface roughness of the shaft should be 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 conditions; 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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Hydraulic excavator working equipment with shaft and bearing depiction
Source: China Bearing Network Time: 2018-01-10