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).
Comparative analysis of gearbox designs, focusing on the advantages and disadvantages of internal mesh with dog clutches.
| Identifier | ExFiles\Box 6\4\ 04-page209 | |
| Date | 25th March 1929 guessed | |
| contd :- -3- their operation required. Failure of the synchronising mechanism interferes very little with the operation of the car. Increase of cost and weight is small. DISADVANTAGES. Some doubt as to durability of cone clutch surfaces. Outer cones are always rotating at engine speed in the stationary control piece although no load is being transferred except during changing gear. Small increase in gearbox length. (5) INTERNAL MESH WITH DOG CLUTCHES. ADVANTAGES. Quiet 3rd. Reports on boxes of this type refer to the changing of top gear as particularly easy, but we see no reason why this should be so. No great amount of extra cost, or complication. Orthodox controls and gate, and no difference in manner of operation. DISADVANTAGES. Gears cannot be ground, and may vary in quietness. Internal mesh gears are always in mesh. Some addition to spinning mass which makes the change into 2nd. more difficult. Considerable increase in length of gearbox. There appear to be two main types of this gear (A) with the internal mesh unit in front, and a long layshaft reaching across the internal mesh unit to the lower gears at the rear. The Detroit Gear & Machine Co's designs are examples of type (A) and the Warner Gear of type (B). Descriptions of both are enclosed. 5 The Detroit gear has an internal mesh unit mounted as shewn in sketch (on the next page) The control against rocking appears to be derived from the fit endwise. The forces on the ring gear are in the same direction so that there is no tendency to rock the gear. The Warner gear has a long internal mesh unit with overhang each end beyond the bearings, but as in the Detroit gear the forces at each end are in the same direction (although not equal) so that no large rocking forces are present. The mounting of the pinion driving the internal mesh unit is not satisfactory as shewn. contd :- | ||