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SPECIAL FEATURES
The basic principle of Unit Construction is the casting of the Engine Crankcase and the Gearbox body in one piece giving exceptional rigidity.
The Primary Drive on New Imperial Unit Construction Models is by helical gear wheels which replace the conventional chain-aim- sprocket type of Drive.
Many advantages arise from the use of Unit Construction, such as the reduction in the overall length of the Engine Gearbox Unit and the consequent shortening of the wheel base of the Machine. The greatest advantage, however* in the eyes of the user, to whom minimum attention to his machine makes an appeal, is the fact that adjustment of Primary Chain, between Engine and Gearbox, is obviated and the special steel helical gear wheels have such a long life (without replacement) that a considerable saving can be shown. These gear wheels run in an oil bath Gearcase, the oil supply of which is maintained through a large filler, being quite unconnected with the Engine oil circuit. The power from the Engine is transmitted to the Gearbox with a minimum of frictional loss.
The general construction of the Spring Frame follows very closely, in its outline, its rigid, conventional counterpart, but the chain stay portion of the rear triangle of the spring frame is mounted at its forward end on a pivot so positioned as to allow the rear fork end' to move with the rear wheel in a vertical plane, the shock ofvthe movement being taken up by spring-loading the seat stay, and controlling the movement by a damper.
The essentials of good Spring Frame design are
(a) The sprung part of the frame must be strong and scientifically triangulated and yet be as light as possible.
(b) The pivots must be on wide centres to give a good working base.
(c) The pivots must be mounted on large taper roller bearings, the wear on which must be taken up easily.
(d) Lubrication must be made easy by the provision of suitable grease gun nipples.
NOTE.—Upswept Exhaust Pipes cannot be fitted with Spring Frame,
WHAT IT DOES—
(a) Removes riding fatigue.
(b) Gives you a new perception of riding comfort.
(c) Gives longer life to every part of the machine particularly batteries and tyres.
(d) Converts third-class by-roads into A class highways.
(e) Gives you that “ on rails ” feeling on corners and makes for SAFETY FIRST.
