Application of bearings for railway vehicles
Railway vehicles bearing means bearing for locomotives and wagons among. Locomotive axle box bearings contain bearings, traction motor bearings, transmission bearings, power equipment, bearings and cooling system, bearings and other; and the first vehicle bearing the axle box bearings; multi-purpose passenger car axle boxes short cylindrical roller bearings; Cards axle tank top choice tapered roller bearings; car bearing the type, layout and function is similar fundamental and axle box bearings.
1. Axle box bearing
Locomotive wheels through axle box, stretch spring and bogie frame and vehicle body is connected; locomotive axle box bearings directly accept sprung gravity and rail radial pair of wheels, axial impact; in addition to traction and consequent transfer occurs Some additional load; thus axle box bearings have a larger carrying capacity; resistant to impact oscillation; it is necessary to have a higher life expectancy, safety and reliability, smaller scale and quality, for easy viewing and protection Thus; locomotive bearing often choose non-standard series of bearings and special bearings skill condition; commonly used bearing the following three categories.
(1) Cylindrical roller bearings majority of diesel and electric locomotives Axle Box Cylindrical Roller Bearings are selected. The primary has the following two kinds.
1) four cylindrical roller bearings
Our first choice axle box bearings and maximum loading amount is four-row cylindrical roller bearings 972,832 bearing bearing type that can be high; Shou several long; its additional dynamic load of 1445kN because only accept radial load; Can not receiving axial load; therefore it is necessary to separate the axle box device accepts axial forces.
2) Double-row cylindrical roller bearings
Dongfanghong 2,3,5,21 type of locomotive axle box and Beijing have chosen double row cylindrical roller bearings 982832T; the bearing receiving radial force; and to touch the ball bearing 146132T acceptance angle axial loads.
(2) Spherical Roller Bearings
Selection Spherical roller bearings strengths is between the axle box and the bogie frame can not be set skew compensation equipment. China's imports from Romania ND2 diesel locomotive axlebox bearings are SKF Bearing Company produced C-type self-aligning roller bearing the type proper and domestic 3G4053736KT roller bearings these bearings is symmetrical;.. no inner outer wall; the wall is detachable; the roller and the outer ring is wire touch; roller useful jobs longer length; use life expectancy than non-symmetrical shape aligning same profile roller bearing larger scale.
(3) Tapered Roller Bearings
Such bearing axle box with a double row tapered roller bearings; US ND5 locomotive jacket with the AP TIMKEN company produced bearings imperial bearing of such dimension; usually used are B, C, D, E , F, G and other levels; leave for different levels of the axle.
2. Traction motor bearings
(1) traction motor armature bearing
Traction motor is electric locomotives and electric locomotive drive system in the primary equipment; armature bearing is one of the primary components of the armature bearing a larger load;. And again by the traction motor scale wheel diameter, the inner two wheels interval The lower boundary of the constraint and locomotives; therefore demand for these bearings is necessary to have as small a scale and a higher speed limit.
1) unilateral transmission bearings
The armature usually use double-pivot support; the output end of the device is swimming gear bearing; commutator end is positioned supporting the output gear end bearing bearing close;. Maximum force; armature bearing two bearings in order to mitigate the key. load; usually use the inner wall of the cylindrical roller bearing NU type commutator end is usually used with single-wall and the inner ring with the flat cylindrical roller bearings NUP type; overseas also have the choice of single inner ring ribs and with a thrust collar of cylindrical roller bearings.
2) bilateral transmission bearings
When the motor power is larger; if you still use unilateral drive gear end bearing load is too big; it is difficult to pick an additional dynamic load and speed limits can meet the needs of bearing; it is depicted in the motor could be replaced by bilateral agreed conditions The drive method bilateral drive strengths is the ability to choose Helical Gear; the spiral angle gears flat; spin to the contrary; then obtain a more stable transmission quality; and without the occurrence of axial load the appropriate use of such bearings. the inner wall of the cylindrical roller bearing NU type; if bilateral transmission are still using spur gear; it should be selected must be able to accept the axial forces bearing; usually used with single inner ring ribs Cylindrical roller bearings NJ type.
(2) traction motor axle bearing
Axle suspension traction motor is typically supported on the side of the truck after adjusting lever; The other side of the axle through the axle bearing axle bearing slide bearing selection simple analogy; but its smooth and view are not convenient; it is from the beginning of the 1950s instead of rolling bearings. So far there have been selected cylindrical roller bearings, spherical roller bearings and tapered roller bearings.
