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).
Oil leakage issues and proposed modifications for hydraulic shock dampers.
| Identifier | WestWitteringFiles\O\January1926-March1926\ Scan95 | |
| Date | 3rd March 1926 | |
| TO R.{Sir Henry Royce} FROM DA.{Bernard Day - Chassis Design} Copy to - CL BY HS{Lord Ernest Hives - Chair} ORIGINAL. RR. HYDRAULIC SHOCK DAMPERS. +235/+8520 Referring to the oil escaping through the rocker shaft gland when it has been thoroughly heated up, we send herewith a print of N. scheme 2153. shewing the following suggestions as a way of overcoming this trouble. (1) To remove the packing gland and replace it by a felt washer, the object of which is merely to keep out water and grit. (2) The oil level to be maintained below the bottom edge of the rocker shaft. (3) If the oil gets through the rocker shaft it is returned by means of the annular space and drain passage to the reservoir. (4) In order that the loss of oil by any means from the reservoir may have as little effect as possible we suggest raising the reservoir above the piston - that is lengthening the inside rocker lever. This is because in the original design if the level of oil falls to, or below the rocker shaft level the head of oil above the piston is very small. The assumption is that it is necessary to keep the piston submerged to prevent air being drawn in. In the original design it was believed that the damper would work until the level of oil in the reservoir fell below the inlet valve. If the proposals recently sent through for removing the air from the system are successful it may be found that air passing through is no disadvantage, or it may be found that the new valve will not chatter even if air is present. Since making this drawing we have received your further suggestions, and have added a modification to the high pressure valve pocket on the lines suggested. The modified filter is on another drawing. DA.{Bernard Day - Chassis Design} | ||