Form of Roller Bearing.—Fig. 101 shows a side and a cross section of a set of rollers held within a cage formed of two end rings A A, each roller B having at its end a reduced bearing C, and intermediate the rollers are tie rods D, which keep the rings in proper relation to each other, and also prevent them from alining themselves diagonally along the shaft, or against the bearing within the boxing.
To provide means for utilizing roller bearings so they will take up end thrust, taper rollers are employed, as shown in Fig. 102.
Fig. 102. Roller Bearing.
The shaft, or axle, A, has two runways, B, C, which are conically-formed, and inclined toward each other. The rollers D are tapering, and have their small ends pointed towards each other so that the outer ends of the bearing surfaces E of the hub are at a considerable angle to the axis of the shaft.
These rollers are also mounted in cages which turn around the shaft. This structure, in a modified form, is largely used in automobile construction.
CHAPTER XIV
RUNNING AN AUTOMOBILE
Don’t look to de right, don’t look to de left;
But keep in de middle ob de road.
This couplet formed part of an old song long before the automobile was known. It serves as a text for some advice in running a machine. When a novice takes out a car for the first time he feels pretty safe in the block intermediate the crossings, and it is only when he comes to the intersecting streets that he begins to feel that something must be done with the signal or the levers, or both.