. Electric railway journal . FIGS. 1 AND 2—WEDGE WITH DOUBLE SIDES, AND PROTEC-TION FOR MOTORS WITH BRASS BEARINGS from injury by them. I would recommend the useof the wedge only with the aid of heat, as illustrated inthe accompanying sketches. The original trouble experienced with the wedge wasthat single wedges were used, one on each side of thepinion. First one side would be driven and then theother until the pinion came off. If the pinion came offeasily no harm was done, but if it showed an inclination. and the pinion. If this wedge is used on a heated pin-ion a few taps with a light hamme
. Electric railway journal . FIGS. 1 AND 2—WEDGE WITH DOUBLE SIDES, AND PROTEC-TION FOR MOTORS WITH BRASS BEARINGS from injury by them. I would recommend the useof the wedge only with the aid of heat, as illustrated inthe accompanying sketches. The original trouble experienced with the wedge wasthat single wedges were used, one on each side of thepinion. First one side would be driven and then theother until the pinion came off. If the pinion came offeasily no harm was done, but if it showed an inclination. and the pinion. If this wedge is used on a heated pin-ion a few taps with a light hammer will remove thepinion without damage to adjacent parts. The newer types of motors on which the better gradesof pinions are used have but a slight space between thepinion and frame, and since the bearing is of brass itcannot stand the backing of a wedge. These are themotors, also, which are in service for long periods be-fore overhauling and which have tight pinions. On thesemotors, therefore, care and judgment are more neces-sary than ever. Fig. 2 illustrates a plate which has been designed torest against the end of the motor frame and to slidedown around the bearing. This plate is thick enoughto extend slightly nearer the pinion than the bearing,so that the wedge may be used between the plate and thepinion without touching the bearing. Fig. 3 shows howthis plate is used. The idea is to make a solid back-ing for the wedge so that it will not be forced into thebearing or into the oil chamber of the
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