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Precision instrument bearing layout
Source: China Bearing Network Time: 2017-09-29
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l. Layout of precision instrument bearings (1) Deep groove ball and angular touch ball bearings are widely used in instrumentation and are widely used in deep groove ball bearings and angular touch ball bearings. The most obvious features are compact layout, small conflicting force and sensitive rotation. And can be selected according to the application needs; in terms of layout and public service level.
(2) Top bearing The bearing capacity of this type of bearing is strong; the conflicting torque. W骶芤 淼 淼 蚣苤 蚣苤 岢 岢.
(3) Contact type bearing This type of bearing has no inner ring or no outer ring; the layout is compact; radial scale. Bao æŽè¯©è·Žå€é¢‚ ψ ψ 谥嵘匣蛲 ä¾µ ä¾µ ä¾µ ä¾µ ä¾µ ä¾µ ä¾µ ä¾µ ä¾µ ä¾µ ä¾µ ä¾µ ä¾µBrother С èƒ è¯¾ å С С С С С С С С С С С С С С С . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Instruments; processing costs increase. Therefore, such bearings are usually only used for high-speed equipment and components that require high levels of conflicting torque.
(4) Multi-turn bearings are also called multi-ring bearings. It usually has 3 to 4 ferrules; 3 columns of steel balls. The center ferrule is used for forced motion; the movement can be swayed; or it can be connected in the opposite direction to the working axis. Transformation. The center ferrule is called an oscillating bearing; the successive transformation is called a rotary bearing. Because the movement of the center ferrule will reduce the collision torque on the working shaft by 7/8 9/10. This kind of bearing is used for low speed. However, the occasion where the conflicting moment of demand is extremely small.
2. High-precision magnetic motor bearings The fundamental function of magnetic motor bearings for precision instruments; such as low noise, smooth operation, low collision torque and wear resistance; all based on high precision. For example; special bearings for computer disk drives; The accuracy cannot be in accordance with the rules of the original radial circle; its public service should be compatible with the track distance of the high-density disk; usually the rule is less than 1/4 of the track width; otherwise it will lead to track fault.
In addition; the following related measures have been adopted to satisfactorily apply the demand.
1 Strictly control the radial clearance of the bearing; make it work under preload.
2 control the starting torque and dynamic torque of the bearing; to meet the demand of the magnetic motor to control the current.
3 to ensure the bearing is sanitary; in the class 100 ultra-clean operation room or ultra-clean workbench to clear the installation of bearings.
4 control bearing smooth oil in the dust particles diameter less than 0. 1 micron; together should also be controlled to follow the increase in the use of time; smooth oil 蜕 caused by the increase and increase of dust particles.
5 bearings use magnetic fluid seal.
3. Ultra-high speed ball bearing ultra-high speed instrument bearings are usually used for high-speed open-milling, high-speed dental drills, etc.; the operating speed can reach above 105r/min; the bearing inner diameter is about 3mm; the working nature is intermittent operation; For hundreds of hours. According to the above operating conditions; the following bearings can be used and the corresponding measures are adopted.
1) Select contact or multi-turn ball bearings.
2) Use small steel ball to depict or ceramic ball bearings.
3) The bearing holder is made of non-metallic material with white smooth function.
4) The dynamic imbalance of the bearing components must be strictly tested.
5) The bearing is properly pre-tightened.
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