. Electric railway journal . ramways. Bail-Bearings on Storage-Battery Cars Arthur V. Farr, M. E., who is with the S. K. Bearing Company, New York, has recently pre-pared the following summary of the value of ball bear-ings in electric railway service: The necessity for extreme accuracy in energy con-sumption has made the builders of storage-battery carslead in the use of anti-friction bearings for journalboxes and motors. Every tie-up required for chargingor boosting and every percentage increase in the coeffi-cient of friction of the bearings limits directly the ap-plication of this t
. Electric railway journal . ramways. Bail-Bearings on Storage-Battery Cars Arthur V. Farr, M. E., who is with the S. K. Bearing Company, New York, has recently pre-pared the following summary of the value of ball bear-ings in electric railway service: The necessity for extreme accuracy in energy con-sumption has made the builders of storage-battery carslead in the use of anti-friction bearings for journalboxes and motors. Every tie-up required for chargingor boosting and every percentage increase in the coeffi-cient of friction of the bearings limits directly the ap-plication of this type of car. A storage battery of given ampere-hour capacity isable to take the car over a definite schedule. Theamount of the starting and tractive efforts determines,among other factors, the limitations of this use of ball bearings has reduced the starting effortupward of 50 per cent, which makes possible eitherquicker acceleration, using the same size motor, orgreater mileage on the one charge, using a smaller. BALL-BEARING HEADS FOR A 65-HP RAILWAY MOTOR 1— Motor shaft 2— Bearing head 3— Outer ball race 4— Balls and ball retainer 5— Inner ball race fi—Oil retaining grooves 7— Lubricant chamber 8— Tap for lubricant supply 9— Housing cap 10— Lock-nut to hold inner race 11— Driving pinion 12— Pinion casing motor. Ball bearings in this way increase the sphereof application of accumulator cars, improving the run-ning schedule and decreasing the number and durationof charging periods. The reduced starting effort directly affects the bat-tery characteristics. Battery efficiencies vary widely,depending upon the rate at which the battery is chargedand discharged, and the extent to which the dischargehas been carried when the charge is begun. Highrates of discharge lower the efficiency, consequentlytypes of axle bearings which necessitate heavy startingeffort put a severe handicap on the storage-battery car. Ball bearings, besides decreasing the st
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