Stack-up force distributions are obtained for normal and abnormal operating conditions in a class F (6 1/2 × 12) railroad tapered roller bearing-axle assembly for various friction coefficients, press-fits and cap screw preloads. Three conditions that affect the stack-up force distribution are considered: a steady-state normal-operating temperature distribution, a steady-state temperature distribution resulting from a stuck brake or a jammed outboard roller, and a transient temperature distribution due to multiple jammed outboard rollers. The steady-state normal or abnormal operating temperature have insignificant effects for nominal values of interference, friction and cap screw preload. However, the effect of the transient temperature due to multiple jammed outboard rollers on the stack-up system is detrimental due to localized high temperature gradients near the outboard cone area and a distortion of the original surface geometry of the cone.

Issue Section:
Research Papers
Topics:
Manufacturing, Railroads, Roller bearings, Rollers, Steady state, Temperature distribution, Friction, Screws, Transients (Dynamics), Bearings, Brakes, Geometry, High temperature, Operating temperature, Press fits, Temperature
1.
DeSalvo, G. L., and Gorman, R. W., 1989, ANSYS Engineering Analysis Systems User’s Manual (version 4.4A), Swanson Analysis Corporation, Houston, PA.
2.
DeSalvo, G. L., and Gorman, R. W., 1992 ANSYS Engineering Analysis Systems User’s Manual (version 5.0), Swanson Analysis Corporation, Houston, PA.
3.
Dunnuck, D. L., Conry, T. F., and Cusano, C., 1992, “Steady-State Temperature and Stack-Up Force Distribution in a Railroad Roller Bearing Assembly,” Rail Ttansportation-1992, Winter Annual Meeting, ASME, Anaheim, CA, RTD-Vol. 5, pp. 89–96, Nov. 8–13, 1992.
4.
Dunnuck, D. L., 1992, “Steady-State Temperature and Stack-Up Force Distribution in a Railroad Roller Bearing Assembly,” M.S. Thesis, Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, IL.
5.
Lawrence, R. V., 1993, Brenco Incorporated, Private Communications.
6.
Wang, H., 1996, “Axle Burn-Off and Stack-Up Force Analyses of a Railroad Roller Bearing Using the Finite Element Method,” Ph.D. Thesis, Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, IL.
7.
Wang, H., Cusano, C., and Conry, T. C., 1994, “Effects of Cone/Axle Rubbing on the Thermomechanical Behavior of a Railroad Axle,” Rail Transportation-1994, ASME Winter Annual Meeting, Chicago, IL, RTD-Vol. 8, pp. 181–190, Nov. 6–11, 1994.
8.
Wang
S.
,
Cusano
C.
, and
Conry
T. F.
,
1992
, “
A Dynamic Model of the Torque and Heat Generation Rate in Tapered Roller Bearings Under Excessive Sliding Conditions
,”
STLE Trans.
, Vol.
35
, pp.
1
–
12
.
9.
Welty
G.
,
1991
, “
When Bearings Fail. . .
,”
Railway Age
, Vol.
192
, No.
12
, pp.
40
–
44
.
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