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).
Letter from Leyland Motors discussing the patent history and specification of short liners in cylinder blocks.
| Identifier | ExFiles\Box 140\4\ scan0267 | |
| Date | 30th March 1940 | |
| LEYLAND BY APPOINTMENT TO THE LATE KING GEORGE V.{VIENNA} LEYLAND MOTORS LIMITED, Head Office and Works, Manufacturers of Motor Vehicles. ALL COMMUNICATIONS TO BE ADDRESSED TO THE COMPANY AND NOT TO INDIVIDUALS CUSTOMERS' VEHICLES DRIVEN AT OWNERS RISK ONLY TELEGRAPHIC ADDRESS: LEYMOTORS, LEYLAND. TELEPHONE: LEYLAND 81400 (16 LINES) LEYLAND. LANCASHIRE. YOURS IN REPLY PLEASE QUOTE: OURS OE/VWP/HK{Col. T. Harker - Sales} Tel: Ext: 97 30th March, 1940. W. A.{Mr Adams} Robotham Esq., Rolls-Royce Ltd., D E R B Y. Dear Robotham, Further to my letter on the subject of short liners in cylinder blocks, I would now advise you that I have been able to dig out all the correspondence relative to this subject at the time of its inception. I find that the provisional specification No. 1500 dated the 16th January, 1935, was lodged in the name of Leyland Motors and Mr. Henry Spurrier Jnr.{Charles L. Jenner} and, briefly, the claims were that :- "wear takes place much more quickly at the inner end of the cylinder owing to the high temperatures and pressures there prevailing than at the outer end. Hence an unlined cylinder must be re-ground and a lined cylinder must be re-sleeved long before wear in the outer part of the cylinder has become serious." "According to the present invention a hardened and renewable surface is provided extending only over that part of the cylinder where wear is rapid, say for one-third the length of the cylinder from its inner end." The provisional specification then goes on to explain how this renewable liner can be inserted, that is, either by fitting a short liner on top of a long liner, or alternatively that the cylinder may be bored in two steps. Further claims were made to obviate the difficulty in passage of the piston ring over the joint between the liner and cylinder by means of bevelled edges or undercuts, and also by the usual means of having completely castellated edges to the liner. In December, 1935, the question of complete specification was raised, when our patent agents made a search through | ||