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).
Technical report on slipper rod and bearing design, materials, and alternatives.
| Identifier | ExFiles\Box 178\2\ img069 | |
| Date | 7th March 1940 | |
| Serial No 8 Rm{William Robotham - Chief Engineer} page 2 OY 8/D/Mar 7-40 On the slipper rod the actual bearing area is about equal to the useful area of the compression side of a conventional rod. The ends are cut off as indicated and this space B,is used for getting section depth in the floating ring. Because of friction coefficient and length of rod, the slipper end, if symmetrical, has a pronounced "reverse Kingsbury" effect and tends to scrape the oil off the pin. The slippers are offset about as much as I have indicated in the larger sketch. And, in addition, the toe is eased off a bit to give a pronounced Kingsbury effect. High oil pressures are found at the heel of the bearing with only a nominal oil pressure in the feed to the pin. On first rods attempts were made to put lining on both sides, but this was so difficult that the rings are now lined inside the ground bore. A serrated joint of common type (Vauxhall-Cadillac) is used in the ring. Rods in general are X4340, presumably about 380 Brinell. 2) Bearings are bronze strip diamond punched and the diamonds filled with white metal .The linings are soldered to the rods. Rip. suggested it might be better on the rings at least to use a silver lining, poured in bored to size, knurled to diamond pattern, filled with white metal and rebored. Rippingille is sending Fedden at Bristol another set of these diamond pattern bearing shells. A set was sent him some months ago, but was not acknowledged. Since then, G.M. have found the diamonds were too large to really support the white metal. The grid used now has diamond openings not more than 1/8" long. He thought you would be interested in seeing these at Bristol, and is suggesting this to Fedden. He referred to a rod we had already seen at the Diesel plant in which a slipper bearing is used in the piston, there is no wrist-pin and a rocker surface is ground on the upper end of the rod. (fig. 1). | ||