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).
The performance of foot-operated pumps for centralised lubrication systems.
| Identifier | ExFiles\Box 27\1\ Scan049 | |
| Date | 2nd January 1929 | |
| To DA.{Bernard Day - Chassis Design} from Hs{Lord Ernest Hives - Chair}/GY. c. to BY.{R.W. Bailey - Chief Engineer} c. to E.{Mr Elliott - Chief Engineer} c. to Wor.{Arthur Wormald - General Works Manager} 43806 Hs{Lord Ernest Hives - Chair}/GYL/LG5. 2. 29. CENTRALISED LUBRICATION. 43806 REPORT ON FOOT OPERATED PUMPS. G.W.H. submitted that N.sch.2647 was unsatisfactory and DA.{Bernard Day - Chassis Design} sent two schemes on N.sch.2736. Both of these schemes have now been tried out and neither compare favourably with the foot or hand operated Bijur pump. We have dismantled Bijur's foot operated pump and found it designed to pump 23.2 ccs, and whereas it will pump 22 ccs with 4 different oils when not under the pressure of the system, connected up only 16.2 ccs were obtained from the drip plugs - an efficiency of 66%. In the present state our own pump is designed to pump 14 ccs, according to N.sch.2736. Actually we find our experimental capacity is lower than this, and since the minimum time, we are advised, in which the plunger should return to its seating is 5 mins., it is essential to increase the capacity. Our new arrangement of drip plugs approved by Bijur's should pass 2.780 ccs. per min. at 70°F with medium engine oil. To do this it will be necessary to increase our capacity to 20 ccs. in order that the plunger shall return slowly. We are not so much aiming at a high efficiency (volumetric) straight away as a consistently reasonable efficiency with every type of oil. The following is a summary of results :- contd :- | ||