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).
Proposed revisions to the Bensport clutch and flywheel for the J.1. engine.
| Identifier | ExFiles\Box 179b\1\ img141 | |
| Date | 24th November 1932 | |
| PY) FROM DA.{Bernard Day - Chassis Design} HS.{Lord Ernest Hives - Chair} ) ORIGINAL DA{Bernard Day - Chassis Design}1/24.11.32. y 4 .-. 7 .-. BENSPORT CLUTCH AND FLYWHEEL. Because of the increased torque to be expected from the J.{Mr Johnson W.M.} 1. engine compared with the original Peregrine type engine, we have found it necessary to revise the dimensions of the multi-plate clutch. There is also the question of the ability of this type of clutch to stand up to the work of synchronising the engine with the synchro mesh box. To deal with these 2 points the following are suggested: (1) The plates are increased in dia. reducing the pressure per sq. in. to 22 lbs., which is well below that of the single plate. (2) The co-efficient of friction has been taken at .175, believed to be the minimum - i.e. the spring pressure has been increased. (3) The friction material is riveted to the driven plate. The driver plates have been considerably thickened and made of alloy C. I. as have also the two end plates, thus giving all C. I. rubbing surfaces, and also giving an opportunity for the heat to escape to the outer drum, the latter being ribbed, or other steps taken to cool it. (4) The flywheel is reduced in moment of inertia compared with the 25HP., thus reducing the work of synchronising. This reduction of inertia is made possible by the flexible joints to the rear of the clutch which are expected to eliminate gear rattles. N. sch. 3574. herewith shews these suggestions. It appears desirable to test this clutch with a synchro mesh box as soon as possible, and we have made N. sch. 3575 (herewith) shewing the Bensport clutch in a 25HP. clutch pit with gearbox attached, and a flywheel approximately half the present 25HP. in inertia. There is a suggestion of a flexible coupling of a very temporary nature inside the pit, but it may be preferred to use the flexible joints behind the gearbox as sent you some months ago. The joint inside the pit is rather restricted. It is suggested that the sch. on N. sch. 3575. should be tried out on an existing 25HP. as soon as possible. DA.{Bernard Day - Chassis Design} [Handwritten Notes] GRY{Shadwell Grylls} See tried out on an existing 25HP. HS{Lord Ernest Hives - Chair} 113 | ||