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).
Proposal for an alternative method of lubricating the speedometer drive bearing.
| Identifier | ExFiles\Box 99\4\ scan0194 | |
| Date | 4th March 1939 | |
| PY/MS (crossed out) c. Rm.{William Robotham - Chief Engineer} H28 DA.{Bernard Day - Chassis Design}4/G.4.3.39. B.V. DAMPER CONTROL PUMP AND SPEEDOMETER DRIVE. The question of lubricating the outer bearing of the speedometer drive which is coupled to the above pump has recently been dealt with by drilling holes connecting the pump teeth spaces with the speedometer drive bearing. Besides causing rather troublesome drilling, it is thought that this scheme may result in some cases in oil finding its way up the speed-flexible shaft owing to the pressure created in the pump. G.CD.1230 shews an alternative suggestion which may avoid any trouble of this sort, while giving adequate lubrication to the speedo-drive bearing. It consists in diverting the overflow from the pump relief valve so as to cause it to flow into the cavity between the pump and the speedo drive, creating by suitable drain holes, an oil level in the cavity which will just reach the speedo-drive bearing, lubrication being by gravity instead of pressure. The existing drain hole at the bottom of the cavity is deleted. Would you please instruct experimentally. DA.{Bernard Day - Chassis Design} | ||