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).
Calculation of bearing loads for a 4 cylinder engine with a 3 ½' bore and 3 ¾' stroke.
| Identifier | ExFiles\Box 115\2\ scan0398 | |
| Date | 12th May 1939 | |
| { SWDC SPOONER } Bearing General File. Rm.{William Robotham - Chief Engineer} o.{Mr Oldham} BY.{R.W. Bailey - Chief Engineer} c. Da.{Bernard Day - Chassis Design} c. Da{Bernard Day - Chassis Design}/Jnr.{Charles L. Jenner} BY/B.1/G.12.5.39. 1020 BEARING LOADS OF 4 CYLINDER ENGINE (3½" BORE x 3¾" STROKE). Crankshaft EB.4843 is used as regards balance masses etc., but extra journals at each end are assumed removed. Connecting rod EB.4847 is used, with Bentley II pistons. The centre bearing is EB.3920 and inter. bearing is EW.1825. The bearing loads have been calculated using a new table of bearing reaction coefficients worked out by me for 4 crank engines, and are tabulated below for various conditions. TABLE DATA: Case. | Description | Speed RPM. | Position of Cranks. 1 and 4 | A.{Mr Adams} Front | B. Inter. | C. Centre | D.{John DeLooze - Company Secretary} Inter. | E.{Mr Elliott - Chief Engineer} Rear --- | --- | --- | --- | --- | --- | --- | --- | --- 1 | Revolving masses only. | 3500 | T.D.C. | +493 | +513 | -2012 | +513 | +493 2 | Revolving + reciprocating masses. | 3500 | T.D.C. | +1177 | +1290 | -3757 | +1290 | +1177 3 | Revolving + reciprocating masses. | 3500 | B.D.C. | -977 | -577 | +4282 | -577 | -977 4 | No.4 alone firing (600 lbs/sq.") | 0 | T.D.C. | +39 | -232 | +926 | -4200 | -2306 5 | No.3 alone firing (600 lbs/sq.") | 0 | B.D.C. | -116 | +695 | -3500 | -3270 | +425 6 | Revolving + reciprocating + No.4 firing. | 3500 | T.D.C. | +1216 | +1058 | -2831 | -2910 | -1129 7 | Revolving + reciprocating + No.3 firing. | 3500 | B.D.C. | -1093 | +118 | +782 | -3847 | -552 *Table header note: Total load (lbs) on bearing :- '+' when acting downwards on crankshaft. | ||