Figure 18.2 Schematic emission chassis dynamometer of late 1980s design. (A) Four 500-mm rollers; (B) selectable flywheel set; (C) belt drive; (D) d.c. motor fitted with shaft encoder; (E) disk brake for vehicle loading
simulation. A number of standard designs are now available from the major suppliers and most are of a compact design having a double-ended a.c. drive motor with rollers mounted overhung on each stub shaft. This type of design can produce a standard, pretested package that enables chamber installation time to be minimized.