FAG four point contact ball bearing
Four-point contact ball bearings are single-row angular contact ball bearings that can withstand high loads in both directions in the axial direction and can only withstand low loads in the radial direction. In order to ensure low friction, especially at high speeds, it is required to ensure a minimum axial load. The fag four-point contact ball bearing is a double-half inner ring so that as many steel balls as possible can be loaded. The outer ring assembly with the steel ball and the half inner ring can be installed independently, and the bearing self-aligning ability is small. The basic type of fag four-point contact ball bearing is due to the large number of steel balls, the height of the shoulder and the contact angle of 35°.
The four-point contact ball bearing has a high axial load carrying capacity. When the four-point contact ball bearing is used as a thrust bearing, a large matching clearance is left between the bearing seat and the outer ring of the bearing to ensure that it does not bear radial force. The large four-point contact ball bearing outer ring has two positioning grooves for fixing the outer ring (bearing code suffix N2).
The four-point contact ball bearing axial clearance basic type of fag four-point contact ball bearing uses a standard group clearance. Larger clearance groups (code suffix C3) can also be used when needed. FAG Four-Point Contact Ball Bearing Cage Most FAG four-point contact ball bearings feature a machined brass solid cage (code suffix MPA) that is guided by the outer ring. The four-point contact ball bearing code holder of the glass fiber reinforced polyamide 66 is suffixed as TVP. The glass fiber reinforced polyamide cage can be used at a stable temperature of 120 °C. If the bearing is lubricated with oil, if the temperature exceeds 100 ° C, any additives in the lubricant will reduce the life of the cage. Therefore, the oil change cycle must be strictly controlled. The FAG four-point contact ball bearing allows the fag four-point contact ball bearing to operate at high speeds only when the rotational speed is only affected by the axial load.
The four-point contact ball bearing heat treatment heat treatment FAG four-point contact ball bearing operating temperature can reach 150 degrees Celsius, the outer ring diameter greater than 240mm bearing working temperature up to 200 ° C can also maintain the external dimensions. However, it should be noted that the operating temperature of the bearing is limited when the cage material is polyamide.
Railway freight car rolling bearing code
Core Tip: Source: China Railway Network 1, GB/T273-1988 standard notation. The bearing code consists of Chinese pinyin letters and numbers. Front paragraph: numbers and letters, digital representation
Source: China Railway Network
1. GB/T273-1988 standard notation.
The bearing code consists of Chinese pinyin letters and numbers.
The first paragraph: the number and letter composition, the number indicates the clearance series (the basic number is 0 auxiliary number is 1~9), and the letters (B, C, D, E, (F), G) indicate the accuracy level.
Middle section: Seven digits indicate the basic model of the bearing. Seven - width series, six five - structural characteristics, four - bearing model, three - diameter series, two one - inner diameter series.
The following paragraph: (Supplementary code) uses letters and numbers to indicate bearing structure changes and special technical requirements.
SKF - SKF manufacturer code
19——Structural features are sealed double row tapered roller
7——The bearing type is tapered bearing
7——The diameter series is a non-standard series
26——Inner diameter is 26*5=130mm
K1, K2 - change in inner diameter (reduced by 0.5, 1.0)
2. GB/T272-1993 standard notation:
Pre-code: A supplementary code before the basic code. The letters indicate the structural shape of the bearing and so on.
Basic code: is the basis of the bearing code. Indicates the basic type structure and dimensions of the bearing.
Post code: Use the letter (or plus number) to indicate the bearing code, tolerance, material, technical code, and then add the supplementary code after the basic code.
35——Structural features are sealed double row tapered roller bearings
2——Width series code 2
2——diameter series code 2
26——Inner diameter is 26*5=130mm
X2 - width is non-standard series
2RZ - skeletal rubber seal on both ends of the bearing (non-contact)
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