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).
Different materials for clutch plates, including asbestos and cotton-based compounds, and a scheme to prevent rusting.
| Identifier | ExFiles\Box 37\2\ scan 002 | |
| Date | 21th December 1918 guessed | |
| BYL/P211218. contd. - 2 - he is now using on the Tank clutch, print of which I enclose, is jointless and will not stick the plates together if made from the samples which we send herewith. This material is a wire woven asbestos, free from sticky ingredients and hydraulically pressed to size. In addition Mr Frood is just perfecting a scheme for finally grinding discs to size. This material would allow of floating discs being used. I am sending you two samples, one 1/8" thick, the other 3/16" thick. In addition to the above, Mr Frood also brought with him a sample of a material which has been made from cotton and which does not contain asbestos. This material is pressed to size and is not woven. It will withstand any temperature up to 500°C. The coefficient friction up to 150°C is constant at .36, but on a temperature rising to 500°C coefficient friction varies, falling as low as 146°C. This characteristic, which Mr Frood agrees is wrong, makes this material, in my opinion, unsuitable for clutch work, but Mr Frood considers that he will overcome this defect shortly, but states that it withstands wear to an extraordinary degree. X.3483. In addition to the above, Mr Frood brought with him rather a good scheme for application to springs, in order to overcome the question of rusting between the plates. The idea is that he weaves a material in a long band with enlarged edges which fits in between the plates of the spring, the enlarged edge being introduced in order to keep the material in position. This material he treats in two ways as follows:- contd. | ||