Patent GB-190602059-A (GB)
Title: Improvements in Rotary Engines.
Inventor: MOND ROBERT
Filed: 1906-01-26
Granted: 1907-02-26
Abstract: 2059. Mond, R. Jan. 26. Gas and like engines.- Relates to engines of the type described in Specification No. 18,402, A.D. 1889, [Abridgment Class Rotary engines &c.], and consists in various modified details whereby engines of this type may be used as gas or oil engines. An inclined shaft 1, Fig. 1, is keyed to a valve block 2. which is integral with or otherwise secured to a rotating cylinder 3. A piston 5 is pivoted to an horizontal shaft 4 and is provided with trunnions which turn in bearings in the ends of the cylinder 3. The piston and the two shafts form the wellknown universal-joint mechanism, so that the piston rotates with and also oscillates within the cylinder 3. The cylinder is divided into two parts 9, 10 by an abutment 8 which bears against a cylindrical portion of the piston. Within the valve block 2 are arranged four mushroom valves 21, 22, 23, 24, Fig. 3, which communicate in pairs with the chambers 9, 10. The valves may be operated by any suitable mechanism, but in the example shown they are actuated by cams 37, 38 carried by a cam shaft 25 which extends through the hollow shaft 1. The cam shaft is rotated from the shaft 1 at half the speed of the latter through gear-wheels 26, 27, 28, 29 and a countershaft 30. The chambers in which the valves work communicate with various ports which register with annular passages 13, 14, 15, 16. Assuming that the engine is working on the Otto cycle, when the valve 22 begins to lift, air passes from the atmosphere through the annular passage 14 and a port in the block 2 to the space beneath the valve and past the latter to the chamber 10, which is then increasing in volume. When the valve has performed a small part of its stroke, it lifts a supplementary valve 34, which until then has closed an annular chamber 32, Fig. 3, whereupon gas passes from an external supply through a passage 15 into the interior of the valve block and chamber 32, and mixes with the air beneath the valve, so that for the rest of the suction stroke a mixture of air and gas passes into the chamber 10. During the next half-revolution, the charge is compressed and fired by any suitable means. The next halfrevolution is the working stroke, and just before it is ended the valve 23 is opened and the exhaust gases are expelled through the passage 13 into the atmosphere. A like cycle occurs in the chamber 9. For the purpose of cooling the valve block and cylinder, water enters through the passage 16 and passes through various passages in the valve block and valve covers and thence to the space round the cylinder wall, into the interior of the abutment 8, and back through other passages in the valve block and covers, and so into the exterior casing, whence it is drained by a pipe 60. The piston is cooled and lubricated as follows :-A plate 61 is fitted to the cylinder and rubs lightly against an annular ring 63. In the space formed between the external cover 62 and the piston oil or an emulsion of oil and water is passed by way of a pipe 64, leaving by a pipe 66. For lubricating the valves, oil passes along an axial passage in the cam shaft 25. The surface of contact between the abutment 8 and the cylindrical part of the piston is lubricated by oil passing through a pipe 70 into a fixed gland 71, through a hole drilled in the shaft, through passages in the valve block, and thence into tubes crossing the water spaces 52 and 54. Various collars are provided for adjusting the rotating parts; In Fig. 1, the shaft 4 is horizontal and is the driving-shaft, a flexible coupling being provided to allow for the variable angular velocity of the shaft. Usually, however, the shaft 1 is horizontal and the power is either taken off this shaft or off the countershaft 30. If the engine is to be operated on a two-stroke cycle, the cam shaft is fixed and thus operates the valves twice as quickly. The engine may be modified for use with oil, in which case only.one set of inlet ports is required.