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 Bijur Motor Appliance Company discussing the performance of an automatic shift and suggesting design modifications.
| Identifier | ExFiles\Box 40\5\ Scan115 | |
| Date | 28th December 1922 | |
| COPY BIJUR MOTOR APPLIANCE COMPANY Hoboken, New Jersey December 28, 1922. Rolls-Royce Company of America, Springfield, Mass. Attention: Mr. M.{Mr Moon / Mr Moore} Olley, Engineer Dear Sirs:- We are in receipt of your letter of the 18th inst. relative to the results of tests on our automatic shift in England. First, in reference to electrical performances of their motor: We have checked this against the performances of our 4½" motors on which we have obtained very satisfactory shift results, and find that there is no reason why our shifts should not give perfect satisfaction on their motors. In reference to your comments relative to the business situation, we would, of course, much rather have them order complete shift assemblies from us rather than attempt to make the parts themselves. We are awaiting with interest further information from them as to their desires. We are taking the liberty of making a layout taken from the blue-print which you enclosed, but showing our latest detachable shift as we would recommend its application. You will note that we have eliminated the outboard bearing, more particularly to eliminate the possibility of oil getting at the clutch facing, as the latter would reduce the carrying power of the clutch disastrously. We also suggest that a 13 tooth pinion be used instead of 14. You will note that if 14 teeth are used the section of the metal remaining in the end of the barrel, is we believe, not sufficiently strong to withstand the end and pressure of the spring, and the shock which this section of the barrel has to withstand. Decreasing it to a 13 tooth pinion, gives a much greater section of metal, in fact it increases the metal from practically 14 mere projections to a complete ring, to support the pinion washer. We believe they will be able to move the starting motor 1/16 of an inch closer to the crankshaft to make up this difference. This could be done on existing engines by making the starting motor pilot eccentric. | ||