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).
Design revisions and considerations for a revised horizontal shock damper.
| Identifier | WestWitteringFiles\V\March1931-September1931\ Scan077 | |
| Date | 24th March 1931 | |
| R.{Sir Henry Royce} FROM DA{Bernard Day - Chassis Design}/HDY.{William Hardy} DA{Bernard Day - Chassis Design}/HDY{William Hardy}1/M24.3.31. Copy to HS{Lord Ernest Hives - Chair}/RM.{William Robotham - Chief Engineer} X335 ORIGINAL REVISED HORIZONTAL SHOCK DAMPER. Herewith we send a preliminary print of the revised horizontal damper. The dimensions do not agree with those given in R3/M17.3.31., but we are modifying the original drawing to obtain agreement. In the meantime we send what we have done. The valves have to be lower down thanis shewn in R1/M26.2.31. and to avoid having one valve inconveniently low we have modified the arrangement of the oil-ways to enable the valves to be on the same level. It should be noted that to avoid having to hand the cylinder both valves must be clear of the lever in its lowest position when on either side of the centreline. The valve springs have to be large in dia. compared with the present springs as their length is less and the ball pin load provided for is greater. With the large valve pocket there seems to be no need for milling to obtain space for the oil-way. The end covers are secured with studs as instructed in R1/M27.2.31. but we shew five studs instead of four as we doubt from our experience with our present dampers whether the smaller number would be sufficient. We have not used the oil-ways as stud holes as it appears to us that the arrangement we shew saves weight by reason of the shorter cast iron cylinder and deeper aluminium covers. A cover is provided at each end to give access to the replenishment valves in the piston. The covers are identical. They have no spigots and so may be milled across unless it is thought that the machining grooves must be concentric with the axis of the cylinder to help with the joint. The longitudinal drilling for supply of oil to the main bearings is placed low down in order to prevent air taking this way out to the detriment of the bearings. The inclined drillings for the replenishment valves provide an easy escape for any solid matter from the valve pocket. A fixed leak is provided but we also shew a form of leak which lends itself to the ready variation which is needed in experimental work. DA{Bernard Day - Chassis Design}/HDY.{William Hardy} | ||