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).
Clutch plate wear in a 6-Eagle-XV 2-speed gear.
| Identifier | WestWitteringFiles\N\July1925-September1925\ Scan270 | |
| Date | 12th June 1925 | |
| R.R. 493A (50 H) (D.D. 31, 12-6-25) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Hs{Lord Ernest Hives - Chair}/AR/LG17.9.25. 6-EAGLE-XV - 2-SPEED GEAR. (1) CLUTCH PLATE WEAR. 6-Eagle-XV was submitted for test with the modified type of gear changing mechanism viz. with the pressure applied to the helix ring at two diametrically opposite points. The connection between the helix ring and the toggle levers are by links instead of the ball and jaw arrangement of the previous design. The engine was run for a considerable time with a light load, after which the throttle was fully opened, using the high gear, to note the full power at normal r.p.m. (1800). The total length of time run on either gear was 4 1/2 hrs: 2 hrs. on high and 2 1/2 hrs. on low gear. After running 3 1/2 hrs. the toggle lever on 'A' side on low gear was fouling its bracket. The bracket was filed to give more clearance, but after another hour's running it was noticed that the piston had reached the designed limit of travel. This shows that the clutch plates had bedded themselves down thereby increasing the clearance between the helix ring and the adjusting plate. The angles of the toggle levers were checked in both high and low gear positions, and the levers were found to be in what are known as the 'worn' positions in both gears. As the clutch plates wear, the angle of the levers alters and it should be arranged for thicker adjusting plates contd :- | ||