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).
Reduction of sponginess in the EAC 7 brakes with suggestions for improvement.
| Identifier | WestWitteringFiles\Q\January1927-March1927\ 143 | |
| Date | 25th March 1927 | |
| TO BY HS{Lord Ernest Hives - Chair}/RM.{William Robotham - Chief Engineer} ) FROM DA.{Bernard Day - Chassis Design} Copy to BJ. EAC. 7. BRAKES. X7420 X8420 We have gone into the question of reducing the sponginess on the EAC. 7. brakes, and send herewith N. schemes 2384/5. shewing some suggestions which have submitted to R.{Sir Henry Royce} We expect that he will give us an idea of the lines along which he would like us to work. On N. sch. 2384. we suggest that the increased stiffness in the brake drum might be obtained by adding a flange on the outside, as is done on the 20HP., in a less degree. The brake shafts are rather more flexible than those on the Phantom, the pedal movements being respectively about .446, and .205. In order to get anywhere near the Phantom rigidity from this cause we should have to increase the shafts to 1.150 as indicated on this drawing. We think this could be put on to the existing brake gear with very little alteration. With reference to the lost pedal movement attributed to the spring wind up, on N. sch. 2385. we have suggested that by modifying the levers, the eye of the foot brake lever could be brought level with the top plate of the spring, which would have the effect of greatly reducing this effect. Only the levers are altered, all other fittings remaining the same. We do not entirely agree with the statement that the direct braking is already a minimum, as it appears to be more than at present on the Phantom in spite of the smaller diameter drum. DA.{Bernard Day - Chassis Design} | ||