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).
Test report on the performance and condition of 32 Ex shock dampers fitted with 'Duprene' glands after extended mileage.
| Identifier | ExFiles\Box 91\2\ scan0329 | |
| Date | 20th September 1937 | |
| To Rm{William Robotham - Chief Engineer}/Les.{Ivan A. Leslie} from HPS{Horace Percy Smith - Experimental Factory Mgr}/W.Bell. c. to HPS{Horace Percy Smith - Experimental Factory Mgr}/RH.{R. Hollingworth} 1298300a HPS{Horace Percy Smith - Experimental Factory Mgr}/WB.{Mr Brazier/Mr Bell}1/CB.20.9.37. 32 Ex SHOCK DAMPERS. Fitted with "Duprene" Glands. Total mileage - N.S. Damper - 15,019. Total Mileage - O.S. Damper - 8,080. Glands. To obtain a correct fit for the "Duprene" glands supplied, it was necessary to increase the shaft diameter by .050", and also reduce the gland housing diameter by .050" - In both cases this was effected by fitting press fit sleeves, finally sweated into position. After 6865 miles, the N.S. inter lever failed, and whilst this was being replaced, the opportunity was also taken to fit a new "Duprene" gland of larger dimensions, and delete the sleeves. After a total chassis mileage of 15,019, the dampers were returned for examination. The N.S. gland was in good condition and in view of this, it was decided not to disturb the damper but merely to note its general condition, and refit to the chassis for further tests. The O.S. gland however, had worked out of the housing, and it was decided to fit a lipped type housing. General Condition. The N.S. damper oil level was low (.625") but still above working level. The loads had decreased to 30 lbs., but in this connection, it should be noted that the original loading of 60 lbs; included 25lbs. gland friction. It was also observed that the main bearings were badly worn - this is interesting since there was no report of "Knocking" occurring during the tests, therefore the effect of the rubber gland on this problem is worth further consideration. continued. | ||