SCIENCE AND TECHNOLOGY ENGLIAH FOR MECHANICAL ENGINEERING Bearings with rolling contact have no lipstick effect, low starting torque and k Slapstick running friction, and unlike as in journal.滑动面粘附现象 bearings, the coefficient of friction varies little with load or speed. Low starting torque is of great advantage in railroad cars. and the railroad industry has given the main impetus impetus for the development of mass-produced roller剌激,促进 bearings in the past, mainly for this reason These bearings may take both radial and axial loads(depending upon the type), and need less space axially but more radiall (except needle bearings), and less lubrication and maintenance, than journal bearings. They are also noisier and more expensive, and cannot be repaired easilySCIENCE AND TECHNOLOGY ENGLISH FOR MECHANICAL ENGINEERING Bearings with rolling contact have no slipstick effect, low starting torque and running friction, and unlike as in journal bearings, the coefficient of friction varies little with load or speed. Low starting torque is of great advantage in railroad cars, and the railroad industry has given the main impetus for the development of mass-produced roller bearings in the past, mainly for this reason. These bearings may take both radial and axial loads (depending upon the type), and need less space axially but more radially (except needle bearings), and less lubrication and maintenance, than journal bearings. They are also noisier and more expensive, and cannot be repaired easily. slipstick 滑动面粘附现象 impetus 刺激，促进