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).
Patent specification for improvements to cylinder liners for reciprocating engines.
| Identifier | ExFiles\Box 140\4\ scan0275 | |
| Date | 14th June 1930 | |
| Half length cylinder liner. LEYLAND MOTORS LTD. PATENT SPECIFICATION Convention Date (Switzerland) : Aug. 13, 1929. 351,726 Application Date (in United Kingdom) : June 14, 1930. No. 18,273/30. Complete Accepted : July 2, 1931. COMPLETE SPECIFICATION. Improvements in or relating to Liners for the Cylinders of Reciprocating Engines. We, SULZER FRÈRES SOCIÉTÉ ANONYME, a Company organised under the Laws of Switzerland, of Winterthur, Switzerland, 5 do hereby declare the nature of this invention and in what manner the same is to be performed, to be particularly described and ascertained in and by the following statement :— 10 This invention relates to liners for the cylinders of reciprocating engines and in particular to divided liners for the cylinders of double-acting internal combustion engines. 15 Various proposals have been made in the case of divided liners to ensure a satisfactory joint between the individual parts of the liner. Where the liners comprise two or more superimposed cylindrical sec-20 tions, the abutting end surfaces of the sections have been provided with some form of aligning device—such as a projecting tongue or flange—on one section engaging a correspondingly shaped 25 groove on the other adjacent section resulting in a joint on the inner wall of the liner which lies in one plane at right angles to the axis of the cylinder. Such a joint produced considerable wear upon 30 the piston rings and this was increased if the two sections were inaccurately centered or aligned. Proposals have also been made to give the abutting ends of the liner sections a sinuous or wave-like form 35 but in such cases as there was no means for maintaining the two sections in alignment the slightest play between the liner and the cylinder produced a series of rough surfaces which caused rapid wear 40 of the piston rings and led to risk of breakage. Similarly it has been proposed in an engine cylinder built up of two liner members supported by an intermediate 45 member to form the joint between the latter and the end of each liner member with the end of the liner section stepped or flanged to engage corresponding steps or flanges on the intermediate member, 50 and a wave-like or irregular edge on the inner flange of each liner to engage a similar surface on the corresponding flange of the intermediate member. With this arrangement, however, since the expansion of the liners is necessarily greater 55 than that of the intermediate member an appreciable clearance must be provided to allow for expansion of each liner in a direction at right angles to the cylinder axis in consequence of which accurate cen-60 tering of the parts when cold is a matter of considerable difficulty and wear or damage to the piston may result. The object of the present invention is to provide a joint which will obviate the 65 drawbacks of the previous constructions whilst combining their respective advantages. To this end, according to the present invention, the engaging ends of the liner 70 sections are stepped or flanged, the abutting edges of the inner flanges being of irregular or wave-like form whilst the abutting edges of the surrounding outer flanges lie in a plane at right angles to 75 the cylinder axis whereby the two sections are maintained in proper alignment even when the parts are cold. Two constructions of liner according to this invention are diagrammatically illus-80 trated in vertical section in the accompanying drawings from which all non-essential constructional details have been omitted. In the construction shown in Figure 1 85 the sections 1 and 2 of the liner are enclosed by the outer casing 3 and their adjacent ends are stepped or flanged so as to form a half-lapped joint at 4. The abutting ends 5 and 6 of the two sections 90 form a butt joint which lies in one plane at right angles to the axis of the cylinder. The abutting or adjacent edges of the inner flanges 7 and 8, however, are of wave-like form, so that the piston rings 95 do not suddenly encounter a joint in the liner wall but gradually pass over this series of wave-like joints. Between the two sections of the liner a gap x may be provided so as to enable the liners to ex-100 pand freely in an axial direction when they become heated. The construction shown in Figure 2 differs from that above described in that the adjoining ends of the sections of the 105 liner are furnished with a tongue and grooved joint instead of with a half- [Price 1/-] | ||