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 liners for the cylinders of reciprocating engines.
| Identifier | ExFiles\Box 140\4\ scan0280 | |
| Date | 22th January 1932 | |
| Half length cylinder liner. LEYLAND MOTORS LTD. PATENT SPECIFICATION Convention Date (Switzerland): Jan. 31, 1931. 379,968 Application Date (in United Kingdom): Jan. 22, 1932. No. 2042 / 32. (Patent of Addition to No. 351,726: dated Aug. 13, 1929.) Complete Accepted: Sept. 8, 1932. 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, do hereby declare the nature of this in- 5 vention and in what manner the same is to be performed, to be particularly described and ascertained in and by the following statement:— This invention relates to an improve- 10 ment in or modification of the divided liner for the cylinder of a reciprocating engine claimed in the British Patent Specification No. 351,726 wherein the engaging ends of two liner sections are stepped or 15 flanged with the abutting edges of the inner flanges of wave-like form whilst the abutting edges of the outer surrounding flanges lie in a plane at right angles to the cylinder axis. The present invention 20 has for its object to ensure a smooth passage of the piston rings across the joint from one liner section to the other. To this end according to the invention the wave-like inner flanges are chamfered 25 or bevelled so as to form in the inner surface of the liner a band-like recess having two undulating boundaries one on each side of the joint, whereby smooth passage of the piston rings over the joint is en- 30 sured. Preferably the sum of the total axial height of both bevellings and the gap between them, when the thermal conditions in the cylinder are such that this gap is 35 at its maximum, is less than the sum of the amplitude of the corresponding waves of the flanges and the height of a piston ring. In this way it is ensured that the lower- 40 most points on the upper boundary of the band-like recess are spaced from the uppermost points on the lower boundary by a distance which is not greater than the width of a piston ring whereby the ring is 45 prevented from entering the recess. One construction of divided liner embodying the present invention is illustrated by way of example in the accompanying drawings, in which [Price 1/-] 50 Figure 1 is a section of a part of the cylinder and liner adjacent to the joint between the two liner sections, and Figure 2 is a development of part of the joint on that side lying within the 55 cylinder. In the construction illustrated the liner arranged within the cylinder 1 is divided into two sections 2 and 3, the section 3 being tongued to engage a groove in the 60 section 2 as shown in Figure 1. The adjacent inner edges 4 and 5 of the two liner sections are of wave-like form, as clearly shown in Figure 2, the cylindrical surfaces 6 and 7 of the tongue and groove 65 serving to centre the two sections. Since the outer cylindrical surfaces of the sections 2 and 3 adjacent to the inner cylindrical surface of the cylinder 1 are only called upon to seal the cooling water jackets 8 and 9, a clearance space is left 70 between these surfaces, and the liner sections 2 and 3 are furnished with grooves 10 and 11 respectively adapted to receive packing rings 12 and 13. The engine piston indicated at 14 carries 75 piston rings 15 and 16 and, with a view to ensuring a smooth passage of these rings over the wave-like joint between the edges 4 and 5 these edges are chamfered or bevelled as shown in Figure 1, each 80 chamfered surface as measured parallel to the axis of the cylinder having a width a so that a band-like recess or depression having wave-like longitudinal boundaries is formed in the interior of the liner, one 85 boundary lying on each side of the joint, as shown in Figure 2. A clearance space s is left between the edges 4 and 5 to allow for expansion of the liner sections during operation of the engine so that the width 90 h of the band-like recess as measured in the axial direction across the peaks of the waves is equal to 2a + s. With a view to preventing the piston rings from entering the band-like recess 95 and thus being subjected to shock and consequent damage the amplitude f of the wave-like longitudinal boundaries of the | ||