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本试验研究用来确定内径为40毫米的滚珠轴承在60°R(33°K)氢气中运转的冷却条件。润滑使用的填充玻璃纤维的聚四氟乙烯重量15％保持架材料。轴承以20000、30000和35000转/分的速度运转,推力负荷为200、300和400磅(890、1335和1780牛顿)。测量出通过轴承之氢气冷却剂的质量流量范围为0.008～0.045磅/秒(0.0036～0.0204公斤/秒)。在所研究的工作范围内,按轴承处于热稳定运转的条件,推导出轴承需要的冷却剂气体最小流量的经验公式。用这种保持架材料计算得出的最小冷却流量,与以前用填充30％(重量)青铜粉的聚四氟乙烯保持架材料得出的最小冷却流量很相似。轴承运转后的检查表明,保持架的磨损率很小;在九个试验过的轴承中, 除一个外,其它的平均磨损率沿保持架引导面每滑动百万英尺(0.3×10~6米)的重量损失大约是0.03％。剩下的这个轴承在两个滚珠兜孔上磨损得很历害,而保持架的磨损率为每滑动百万英尺(0.3×10~6米)大约磨损0.3％。运转了七个小时以上的大多数轴承,有些内圈滚珠轨道的磨损是明显的。
This study investigated the cooling conditions used to determine ball bearings with an inner diameter of 40 mm operating in 60 ° R (33 ° K) hydrogen. Lubricated glass fiber filled Teflon 15% by weight cage material. Bearings are operated at 20000, 30000 and 35000 rpm with thrust loads of 200, 300 and 400 pounds (890, 1335 and 1780 Newtons). The mass flow rate of the hydrogen coolant passing through the bearings was measured in the range of 0.008 to 0.045 lbs / sec (0.0036 to 0.0204 kg / sec). Based on the condition that the bearing is in thermal stable operation, the empirical formula of the minimum flow of coolant gas required by the bearing is deduced in the working range studied. The minimum cooling flow calculated with this cage material is very similar to the minimum cooling flow previously obtained with PTFE cage materials filled with 30% by weight bronze. Inspection of the bearing after running showed that the cage wear rate was small; with the exception of one of the nine tested bearings, the other average wear rate was per million feet (0.3 × 10 -6 meters) sliding along the cage guide surface ) Has a weight loss of about 0.03%. The remaining bearing is worn out on two ball pockets and the cage wear rate is approximately 0.3% for every million feet (0.3 × 10 ~ 6 meters) sliding. Most bearings that have been running for more than seven hours have some wear on the inner raceway ball is noticeable.