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New type tapered barrel roller bearings for heavy trucks Bearings for railway locomotives

New type tapered barrel roller bearings for heavy trucks Bearings for railway locomotives

2021-08-04

The high bearing capacity of roller bearings makes its application very wide. The design and processing of rollers are also developing continuously.A new type of tapered barrel roller bearing will be introduced below.


Tapered roller bearings for automobile gearboxes solve the problem of bearing layout, but the guide edge of the ring is prone to friction, leading to high wear.The geometry of the roller also creates a normal force on the inner rim, causing the contact area to slip and cause wear.


In the same shape size and fat storage size under the choice of double row deep groove ball bearings as an alternative, the wear will be much less, but the bearing capacity is lower than tapered roller bearings, can meet the general vehicle axle gearbox use.For heavy trucks, the load rating is insufficient and must be improved.According to research from the Technical University of Kaiserslautern in Germany:Diameter of 70 mm and no special surface precision (surface roughness Ra value of 0.15 microns) of cone drum roller bearing the basis of the prototype even if not optimal, but its wear resistance has been with the same main dimensions, the optimal penal geometry shape and high quality surface precision (surface roughness Ra value of 0.03 microns) of tapered roller bearing.Contact points P1 ~ P4 refer to two points on the inner and outer raceway respectively.The two tangential lines of the middle contact point of the inner and outer raceway intersect at the point M of the symmetry axis, thus producing the cone Angle α.The outer contour of the roller surface can be represented by a circle of constant radius R.At this point, maintain the vital role of the frame, not only to maintain the spacing of the roller, but also by maintaining the roller to correct the skew.


The advantages of tapered barrel roller bearings relative to tapered roller bearings are: because there is no barrier, avoid the area in the axial contact force, which is the main cause of wear (the working principle of tapered roller bearings);No spin motion (compared with double row ball bearings);Due to the use of no self-locking cage, only a small guiding force;Insensitive to tilt;High bearing capacity under combined loads (double row ball bearings cannot meet this characteristic).The geometric structure of the new bearing combines the advantages of tapered roller bearings (high load capacity under combined axial and radial loads) and barrel roller bearings (no barrier contact, high tolerance for roller inclination and skew), so it can be an alternative bearing in heavy-duty applications.Note that the design and development concept of the structural bearing has been simulated and analyzed for 32208, and the model needs to be further optimized, as well as the manufacturing and testing of samples.


1, bus axle box bearing: single row cylindrical roller bearing, for two sets of NJ and NJP cylindrical roller bearings in pairs.Accuracy class 5, operating speed 160km/h, life 800,000km, reliability of more than 99%, bearing temperature rise: ambient temperature +40℃.The bearing is used in changchun passenger car Factory, Tangshan locomotive and rolling stock Factory, Qingdao Sifang locomotive and rolling stock factory and other passenger cars.


2, urban subway, light rail bearings: mainly used single row cylindrical roller bearings, tapered roller bearings, insulated deep groove ball bearings, etc.Precision class 6, the maximum operating speed of 100km/h, life of 700,000km, reliability of more than 99%, bearing temperature rise: ambient temperature +30℃.The bearing is used in Shanghai Railway Company, Beijing metro Company, Guangzhou metro Company and other subway and light rail vehicles.


3, truck axle box bearing: double row tapered roller bearing with labyrinth seal on both sides.Accuracy class 5, operating speed 140 km/h, life 800,000km, reliability of more than 99%, bearing temperature rise: ambient temperature +40℃.The bearing is used for Zhuzhou rolling stock Works, Tangshan rolling stock works, Qingdao Sifang locomotive rolling stock works, Qishuyan locomotive rolling stock, etc.


4, locomotive axle box bearing: single row cylindrical roller bearing, two sets of NJ and NJP type or two sets of NU and NJP type cylindrical roller bearing pair use.Precision class 5, operating speed of 160km/h, life of 800,000km, reliability of more than 99%.The bearings are used for shaoshan type 8 and 9 electric locomotives of Zhuzhou electric locomotive plant, Dongfeng type 4 diesel locomotive of Qingdao Sifang locomotive and rolling stock Plant, Changdongfeng type 11 and 8B diesel locomotive of Qishuyan locomotive and rolling stock, Type 8B diesel locomotive of Ziyang locomotive and rolling stock Plant, Dongfeng type 4D diesel locomotive of Dalian locomotive and rolling stock Plant, etc.


5. Locomotive traction motor bearing: single row cylindrical roller bearing is used for supporting parts of traction motor of electric power and diesel locomotive. The output end is NU type bearing structure, which mainly bears radial load, and the input end is NH type bearing structure, which mainly bears certain radial load and axial load.Precision class 5, the highest speed is 2500 RPM, can meet the running speed of 160 km/h locomotive use requirements, life is more than 800,000 km, reliability of more than 99%;Low vibration value: kurtosis coefficient is less than 5.0, vibration acceleration value is less than 9g.The bearing is used in shaoshan type 8 and type 9 electric locomotive traction motor of Zhuzhou electric locomotive plant, long Dongfeng type 11 and 8B diesel locomotive traction motor of Qishuyan locomotive and rolling stock, Dongfeng type 4D locomotive traction motor of Dalian rolling stock plant, 8B diesel locomotive traction motor and so on.


6, locomotive main generator bearing: single row cylindrical roller bearing, the bearing is used for dongfeng type internal combustion engine owner generator support position.Precision class 6, the highest speed is 1500 RPM, can meet the running speed of 160 km/h locomotive use requirements, life is more than 800,000 km, reliability of more than 99%;Low vibration value: bearing inner ring raceway with crown, so that the bearing has a certain degree of aligning.The bearing is used for qishuyan locomotive and rolling stock changdongfeng 11 and 8B diesel locomotives, Dalian locomotive and rolling stock Works 4D diesel locomotives, Ziyang diesel locomotive works 8B diesel locomotives and so on.


7, locomotive full suspension bearings: single row cylindrical roller bearings, for two sets of N and NUP cylindrical roller bearings in pairs.Full suspension structure is hollow shaft belt vibration damping device, to achieve low vibration, high speed, high reliability requirements, bearing accuracy class 6, running speed of 160 km/h, life of 800,000 km, reliability of more than 99%.The bearings are used in shaoshan type 8 and 9 electric locomotives of Zhuzhou electric locomotive plant, Changdongfeng type 11 and 8B diesel locomotives of Qishuyan locomotive and rolling stock, dongfeng type 4D locomotives of Dalian locomotive and rolling stock Plant, etc.


8, locomotive axle gearbox bearing: single row cylindrical roller bearing, four point angular contact ball bearing.Precision class 6, operating speed of 160km/h, life of 800,000km, reliability of more than 99%.The bearings are used for shaoshan type 8 and 9 electric locomotives of Zhuzhou electric locomotive plant, Dongfeng type 4 diesel locomotive of Qingdao Sifang locomotive and rolling stock Plant, Changdongfeng type 11 and 8B diesel locomotive of Qishuyan locomotive and rolling stock, Type 8B diesel locomotive of Ziyang locomotive and rolling stock Plant, Dongfeng type 4D diesel locomotive of Dalian locomotive and rolling stock Plant, etc.


9, locomotive hydraulic transmission system bearing: single row deep groove ball bearing, cylindrical roller bearing, angular contact ball bearing, four point angular contact ball bearing, single row tapered roller bearing.Precision class 6, operating speed of 160km/h, life of 800,000km, reliability of more than 99%.The bearings are used for shaoshan type 8 and 9 electric locomotives of Zhuzhou electric locomotive plant, Dongfeng type 4 diesel locomotive of Qingdao Sifang locomotive and rolling stock Plant, Changdongfeng type 11 and 8B diesel locomotive of Qishuyan locomotive and rolling stock, Type 8B diesel locomotive of Ziyang locomotive and rolling stock Plant, Dongfeng type 4D diesel locomotive of Dalian locomotive and rolling stock Plant, etc.


10, 200 km/h high-speed bus, locomotive axle box bearing:Are now being developed 200 km/h high-speed passenger train, locomotive axle box bearing with double row cylindrical roller bearings, the bearings for the two sides with dust cover, engineering plastic cage double row cylindrical roller bearings, precision grade 4, more compact structure, size, to develop in the direction of lightweight, low friction, low vibration, high cleanliness, high precision, high speed, high reliability,Meet the running speed of 200 km/h, the highest 240 km/h, bearing temperature rise: external temperature +40℃, service life 1.2 million km.


11, 300 km/h high-speed passenger train, locomotive axle box bearing: the future study of 300 km/h, locomotive axle box bearings for high speed passenger cars are compact double row circular cone roller bearings, both sides with labyrinth seal, cage for engineering plastic cage, dynamic performance and temperature sensors and sensors, may at any time monitoring of bearing, the bearing is more reliable under high speed.

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