| 摘要 |
PURPOSE:To prevent leak of grease in a bearing, by a method wherein a bypass groove is formed between a space chamber, formed with a casing and a rotor, and a space chamber, formed on the opposite side with a bearing therebetween, and lip seals are situated to both end surfaces of the bearing. CONSTITUTION:Space chambers a1 and a2, formed with a casing 1 and rotors 2 and 3, are communicated to space chambers b1 and b2, formed on the opposite side with ball bearings 6 and 8, respectively, therebetween, through the medium of bypass grooves d1 and d2. Thereby, pressures in the space chambers a1 and b1 are balanced with those in the space chambers a2 and b2, and grease in the ball bearings 6 and 8 can be inhibited against outflow. Lip seals 14a and 15b, each formed in a U-shape in cross section, are mounted to both end surfaces of each of the ball bearings 6 and 8, and lubricating oil grease, with which a ball part space chamber (c) is filled, can be prevented from outflow from the lip seal 15a side to the space chamber a1 or a2 side. This constitution prevents leak of grease, smooths lubrication of the bearings 6 and 8, prevents the occurrence of wear and seizure, and enables provision of an increased life.
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