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1、1 MACE Design 3Design 3 BearingsBearings Hamidreza G.Darabkhani Course Leader: A. Starr MACE ContentsContents Bearings Bearings Classification Loads on Bearings Rolling elements bearings Ball bearings Roller bearings Needle bearings Linear bearings Thrust bearings Sliding bearing Magnetic bearings A
2、pplication of bearings Bearing calculations Bearing mounting MACE Provides support for rotating machine elements Bearings MACE Bearings(1/2) 2 MACE Bearings(2/2) MACE Bearings for Rotary Motion Rolling ElementsMagnetic Bearings Sliding Bearings (Fluid film bearings) BallRollerNeedle Cylindrical Tape
3、r Barrel Bearings Classification MACE ?Ball Bearings Radial and Axial loads ?Roller Bearings Radial and Axial loads ?Needle Bearings Only radial loads Allocated Loads on Bearings MACE Rolling Elements Bearings 3 MACE Single row radial ball bearing See the difference in the curvature of the ball and
4、the race. (Point Contact) Good Radial Load Moderate Axial Load Very good speed MACE Ball Bearings with shields The shields are use to exclude dirt and foreign particles MACE Angular contact Bearings ?Balls are inserted by thermally expanding the outer ring. ?Can take greater axial load Good Radial L
5、oads Good Axial loads Good Speed MACE Double row ball Bearings Good Radial Loads Poor Axial loads Moderate Speed 4 MACE piece inner-ring ball bearings Advantages: ?The maximum complement of balls makes for higher load carrying capacity. ?The very deep ball raceway shoulder makes for high thrust- loa
6、d capacity. ?Thrust loads can be handled in both directions. MACE Roller Bearings ?Because of the line contact, they can take greater loads ?They also have more rolling resistance ?Types of roller bearings Cylindrical Tapered Barrel (Spherical) MACE Are used in applications like conveyer belt roller
7、s, where they must hold heavy radial loads. Line contact to handle much greater loads than a ball bearing. Is not designed to handle much axial loading. Cylindrical roller bearings Very good Radial Loads Poor Axial loads Moderate to very good Speed MACE Are used in car hubs, where they are usually m
8、ounted in pairs facing opposite directions so that they can handle thrust in both directions. Tapered roller bearings Very good Radial Loads Good Axial loads Moderate Speed 5 MACE Needle bearings(1/2) ?Use large number of small diameter rollers ?Usually there is no space between rollers (needles). N
9、o cage required. ?Very good Radial loads ?No Axial loads ?Poor to moderate speed MACE Linear bearings Are used primarily where something needs to be moved along a straight line with high accuracy. In other words, the object needs to only translate in one direction, and possibly move back to its star
10、ting position with high repeatability. The implications for robotic pick-and-place are obvious, as are uses for optical test fixturing and calibration. MACE Thrust Ball Bearings Cylindrical roller Spherical roller Good Axial Loads No Radial Loads Poor Speeds Thrust bearings MACE Ball thrust bearings
11、 are mostly used for low-speed applications No Radial Loads Good Axial loads Poor to Moderate Speed 6 MACE Roller thrust bearings 1.They can support large thrust loads 2.They are often found in gear sets like car transmissions between gears, and between the housing and the rotating shafts. 3.The hel
12、ical gears used in most transmissions have angled teeth in this causes a thrust load that must be supported by a bearing Very good Axial Loads No Radial Loads Poor Speeds MACE Animations 1- The rotation of inner and outer race in ball bearings. 2- Directions of radial and thrust loads on the bearing
13、s MACE Sliding Bearings (Fluid film bearings) Fluid film bearings have no rolling elements Lubricated by a film of liquid or gas which separate moving member from the stationary member The fluid (usually Oil) is circulated so that fresh, cool oil is constantly entering the space between the stationa
14、ry and rotating pieces. MACE Sliding Bearings (Fluid film bearings) Industrial machinery with high horsepower and high loads, such as: steam turbines, centrifugal compressors, pumps and motors 7 MACE Magnetic Bearings Magnetic bearing systems represent a completely different approach to the support
15、of rotating equipment. (NON-CONTACTING TECHNOLOGY) Magnetic Bearings are operating in: compressors, electric motors, pumps, turbo expanders, steam turbines, gas turbines, centrifuges, etc. MACE Magnetic bearings Are a non-contacting technology Negligible friction loss and no wear Higher reliability
16、Enables previously unachievable surface speeds to be attained Lubrication is eliminated Magnetic Bearings for High Temperature Smart Aero Engine Conical Magnetic Bearings Developed for Active Stall Control in Gas Turbine Engines MACE Bearing applications Air Condition systems WheelsGearboxes Pumps Mixers MACE Bearings in flight systems Helicopter bearing Helicopter ball bearing ball bearing Piston engine propeller 8 MACE Pulley cage rear side plate In AEROKOPTER Main rotor gea
