Figure 13-15.& - Six-cylinder axial compressor.

Four-Cylinder Radial Compressor

The four-cylinder radial compressor (fig. 13-14) positions four pistons at right angles to each other. The pistons are driven by a central shaft connected to the engine by the electric clutch assembly and V-belt. The radial compact design of the compressor is very popular on the vehicles of today.

Six-Cylinder Axial Compressor

This design uses three double-ended pistons driven by a wobble plate (fig. 13-15). The three cylinders effectively produce a six-cylinder compressor. As the shaft rotates, the wobble plate displaces the pistons perpendicular to the shaft. Piston drive balls are used to cut down friction between the wobble plate and pistons. Piston rings, also, are used to aid in sealing.