From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
'Coronation Rattles' and 'Transmission vibrations', attributing the cause to an asymmetrically balanced brake drum and proposing a solution.
Identifier | ExFiles\Box 25\3\ Scan040 | |
Date | 31th January 1912 | |
Copy. N19/B5212. Le CanadelHenry Royce's French residence. 31st January 1912. Members of the Technical Committee. Re Coronation Rattles. Re Transmission vibrations. The fact that the brake drum is not symetrical because it is balanced by drilling is offered, by Mr Royce, as a possible reason for the vibrations. The lack of symmetry of the drum means a variation in the force required to accelerate it as between one part or another, hence the pressure on the bearings causing the vibration. This is supported by the statement that the vibration is bad if the gear box is out of line, i.e. when there is a comparatively big variation in speed. Some methods for overcoming the trouble which may be tried are :- (1) Mount inside the brake drum damping rings, thus - rings with some inertia and mounted by friction on the brake drum. The brake drum may oscillate very freely at present (practically without friction) and this scheme is to prevent the oscillation occuring without friction. OS&O (B'TES 'B9X' (H 02) S9S 'H'H [Handwritten text in right margin:] Reason why the Transmission vibration affects the car but this seems a better explanation as long as the car is at rest & the cause of the vibration. [Handwritten text in left margin:] (k) X634 | ||