冬季低温下，轨道车辆对轮转向支架轴承润滑测试
lubrication test of wheel steering bracket bearing in rail vehicle under low temperature in winter
在北方，尤其随着冬季的到来，气温的降低，对于设备润滑来说影响是非常大。由于天气温度降低，会导致润滑油脂粘度增加，流动性降低，要保证设备润滑有良好效果，对于润滑剂的要求比较高。
in north china, especially with the arrival of winter, the decrease of temperature has a great impact on the lubrication of equipment. as the weather temperature decreases, it will lead to an increase in the viscosity of lubricating grease and a decrease in fluidity, to ensure that the equipment lubrication has a good effect, the requirement for lubricants is higher.
某蒸汽机车维保厂就遇到这种因天气温度降低的影响，其轨道车辆对轮转向支架轴承所使用的润滑剂，在北方冬季工作过程中会出现润滑剂粘稠度变大，车辆启动困难的问题。
a steam locomotive maintenance plant has encountered this kind of influence due to the lowering of weather temperature, and the lubricant used by its rail vehicle to wheel steering bracket bearing will have the problem that the lubricant becomes sticky and the vehicle starts difficult during the working process in winter in the north.
轨道车辆对轮转向支架轴承
wheel steering bracket bearings of rail vehicle
经优润(u.lube)团队现场调研发现目前轨道车辆使用的润滑剂无法保持在低温下的润滑效果，针对此问题，需要使用耐低温的高性能润滑剂，主要具备以下特点：
the u.lube team found that the current lubricants used in rail vehicles cannot maintain the lubrication effect in low temperature:
1. 耐低温零下30℃（极端-40℃）；
2. 优秀的抗水汽、防锈性能；
3. 良好的承载能力；
4. 长效性好，使用寿命长。
1. resistance to low temperatures of -30°c (extreme -40°c);
2. excellent resistance to water vapor and rust;
3. good load-bearing capacity;
4. good longevity and long service life.
根据这些润滑剂特点，优润(u.lube)团队推荐使用优润高性能润滑剂，具备优秀的耐低温性能，耐水、良好抗重载能力，适用于多种低温、重载、水汽等环境。对于产品是否符合要求还需要经过测试验证耐低温性能。
according to these lubricant characteristics, u.lube team recommends the use of u.lube high performance lubricant, with excellent low temperature resistance, water resistance, good resistance to heavy load, suitable for a variety of low temperature, heavy load, water vapor and other environments. for the product to meet the requirements also need to be tested to verify the low temperature resistance performance.
测试方法是将适量样品放置于低温箱中，设置温度为零下40℃，放置24小时，取出样品，不凝固，不结块，并对比常温下的油脂性状不发生明显变化。
the test method is to place the appropriate amount of samples in the low temperature box, set the temperature at -40 ℃, stayed for 24 hours, take out the samples, no solidification, no lumps, and compare the grease properties at room temperature does not change significantly.
实际测试结果：油脂并未结块凝固：呈可拉丝状态，外观颜色性状无变化，测试效果良好。
the actual test results: the grease did not clump and solidify: it was in a drawable state, no change in appearance and color, and the test result was good.
左图是低温冷冻前的润滑剂状态，右图是24小时低温冷冻后的润滑剂状态
the left picture is the lubricant state before cryogenic freezing, and the right picture is the lubricant state after 24 hours cryogenic freezing
目前已在轨道车辆上进行了大批量的使用，经过一段时间使用，反馈润滑效果良好，解决轨道车辆在北方冬季工作过程中车辆启动困难的问题。
at present, it has been used in large quantities on rail vehicles. after a period of use, the feedback is that the lubrication effect is good and solves the problem of vehicle starting difficulties during the working of rail vehicles in winter in the north.