Abstract: A chassis dynamometer includes a load roller and a free roller both of which are driven by a tested object, such as, an automotive vehicle. The load roller is drivingly connected to a dynamometer and mounted onto a first rotary shaft for co-rotation therewith. The free roller is mounted on a second shaft such that the free roller is rotatable relative to the second shaft. A flywheel is mounted on the second shaft co-rotatably therewith for forming a simulated inertial load. A power transmission unit, such as, a combination of timing pulleys and a timing belt is provided for transmitting a driving power from the first shaft to the second shaft such that the second shaft is rotated fster than the first shaft. Since the second shaft i.e. the flywheel is rotated faster than the first shaft, i.e. the load and free rollers, an inertial load created by rotation of the flywheel is increased so that a weight of the flywheel can be reduced.

Abstract: A twin roller type chassis dynamometer includes two coxially arranged load rollers and two coaxially free rollers. The two pairs of rollers are arranged parallel to one another. One of the free rollers includes an outer rotor dynamometer. The rotor of this device is connected by way of a belt drive with one of the load rollers in a manner which produces a step-up gearing and drives the rotor faster than the load roller.

Abstract: A chassis dynamometer designed for effectively performing bench testing performance of an automotive vehicle, comprises a first roller supported on a swingable shaft and housing therein stator and rotor forming a dynamometer, a second roller coupled with said first roller for synchronous rotation therewith; a flywheel detachably and coaxially disposed within the interior space of the second roller for rotation therewith; and a retainer associated with said flywheel, for detachably retaining said flywheel within the interior space of the second roller, the retainer restricting axial displacement of the flywheel relative to the second roller.

Abstract: An engraving board for printing a design with coloring media comprising, a first or thick paper layer with a second or thinner paper layer overlaying the thick paper layer and secured thereto. A printing layer comprising a multiplicity of densely packed short fibers overlays the thin paper layer and is secured thereto. The three layers can be secured to each other by means of water resistant adhesive and both the thinner and thick paper layers can comprise water absorbent material so that when a design is impressed upon the printing layer, exposing a portion of the thin paper layer, the coloring medium which is applied over the engraving board is absorbed into a thinner paper layer leaving the coloring medium on the remaining printing layer only to be used in printing the design.