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Hydraulic excavator working equipment shaft and bearing depiction (1)
Source: China Bearing Network Time: 2018-07-11
| /*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 using the bearing is not complete oil film smooth; has used copper, steel, copper-based steel back self-smoothing and other bearings. Copper bearing is excellent in resistance; general wear resistance; good protection effect on the shaft; 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 The smooth bearing combines the advantages of steel bearing and copper bearing; the oil groove is smooth and self-smooth; it can be used to prevent 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 in the ambition state; K = (1 ~ 5) × 10-8 [mm / (N / mm20 é¹ / min0 é¹” r)]
1, Ci = C0 × Cl × C2 × C3
2, bearing pressure P
Generally speaking, the bearing pressure refers to the maximum load of the bearing support divided by the pressure receiving area; the so-called pressure receiving area; when the bearing is cylindrical; take the projected 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 according to 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 works, the bearing temperature is affected by the heat and heat generated by the conflict; generally 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; therefore, the lower PV can be used in the depiction. value.
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