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).
Visit to Humbers Ltd. to discuss issues and alternative designs for water pumps and fans.
| Identifier | ExFiles\Box 126\2\ scan0120 | |
| Date | 16th June 1939 | |
| 1069. To By.{R.W. Bailey - Chief Engineer} c. to By/HS.{Lord Ernest Hives - Chair} c. to DA{Bernard Day - Chassis Design}/Mo. c. to Da.{Bernard Day - Chassis Design} c. to By/Ald.{F. Allwood - Experimental Design} c. to By/CS. Rm{William Robotham - Chief Engineer}/Ed.{J. L. Edwards}8/JH.16.6.39. Visit to Humbers Ltd. A visit to the above firm was paid on the 13th. inst. by By/Ald.{F. Allwood - Experimental Design} and writer with the object of discussing water pumps and fans. Their Mr. Coy was interviewed and the following points arose. (1) Water Pumps. It was stated that the experience of Humbers was that the sealed bearing of the type we are at present using on B.80 and 60 was generally unsatisfactory, suffering from the loss of lubricant and excessive wear, faults similar to those experienced on our own pumps. An alternative design was evolved which incorporated the following points :- (a) Two Hoffmann ball bearings were used on a hardened steel shaft - either stainless or nitralloy, and are sealed against loss of lubricant. The bearings are available for greasing, however, a grease nipple being fitted, and replenishment recommended every 10,000 miles. (b) To relieve internal pressure in the bearing resultant on the temperature variations, a vent hole is provided and appears to work very well, it being stated that after 7,000 miles the grease content of the bearing had fallen from 80% to between 65 and 70%. (c) The sealing gland consists of a spring loaded rubber ring pressing against a carbon disc, the whole gland rotating with the pump rotor, and the carbon sealing face bearing on the actual pump casing to provide a seal. No brass retaining ring is provided for the spring as a corrosive action was found to take place between the brass and steel. | ||