Patent GB-190803579-A (GB)
Title: An Improved Reversible Petroleum and Compressed Air Motor.
Inventor: BERLTET MARIUS
Filed: 1908-02-17
Granted: 1908-05-07
Abstract: 3579. Berliet, M. Feb. 16, 1907, [date applied for under Section 91 of Patents &c. Act, 1907]. Gas or explosive-vapour engines.--A three-cylinder engine suitable for marine propulsion has two halfspeed cam shafts 11, 12, Figs. 1 and 3, one controlling the compressed - air admission valves 8, 9, 10 and the exhaust valves 5, 6, 7, and the other controlling the admission valves for the working fluid. Both cam shafts are adjustable axially to bring different cams into operation, successive adjustments of the two shafts allowing the engine to operate in the following ways : (1) forward running with full admission of compressed air in three cylinders ; (2) forward running with early cut-off of compressed air in three cylinders ; (3) forward running with one cylinder working with compressed air and two cylinders working with petrol ; (4) forward running with three cylinders working with petrol ; (5) backward running with early cut-off of compressed air in three cylinders ; (6) backward running with full admission of compressed air in three cylinders ; and (7) backward running with three cylinders working with petrol. The Specification, in the original form, as published under Section 91 (3) (a) states also that the engine can be made with six cylinders and may have automatic admission valves, and describes other engines, a compound air-compressor and a method of reducing the clearance in a motor cylinder for working with compressed air. A six-cylinder engine driving three cranks set at 120 degrees is controlled by a single axially-adjustable cam-shaft 19, Figs. 8 and 11, and may operate in the following ways : (1) forward running with six cylinders working with petrol, the cams 13, 14 controlling the exhaust valves ; (2) forward running with three cylinders working with petrol and alternate cylinders working with compressed air, the cams 13 and the double cams 34 controlling the exhaust valves, and the double cams 37 controlling the compressed-air admission valves ; and (3) backward running with three cylinders working with compressed air and alternate cylinders running idle, the exhaust valves of the idle cylinders being held open by cylindrical bosses 40, while the exhaust valve of the other cylinders controlled by double cams 44 and the compressed-air admission valves by double cams 41. The ordinary admission valves are automatic. This engine may also be arranged to drive forwards with three cylinders working with compressed air, alternate cylinders running idle. The compound air-compressor 52, 53, shown in section in Fig. 9, is driven by gearing 58 from the crank-shaft. Air is drawn in through a valve 51 and delivered to a reservoir. through a disk-valve 56. The compressor may also be driven direct from the engine crank-shaft. Fig. 10 shows a three-cylinder engine similar to the above, with a simple air-compressor 52 driven direct from the crank-shaft. This engine may run forwards with petrol or in either direction with compressed air admitted to all the cylinders. The cams for each cylinder are arranged in the same manner as the cams 44, 14, 34, 41, 37, Fig. 11, described above. Fig. 18 shows a six-cylinder engine similar to that described above ; additional cams 37<1>, 41<1> for the compressed-air admission valves, give an early cut-off for working expansively. This engine is stated to operate in the following ways : (1) running in either direction with three or six cylinders and full admission of compressed air ; (2) running in either direction with three cylinders working with petrol and three with compressed air with early cut-off; and (3) running in either direction with six cylinders working with petrol. Figs. 23 and 24 show the method of reducing the clearance when working with compressed air. The compression chamber 76 may be shut off at will by turning a disk 78 out of register with apertures 77. The disk 78 is adjusted by the lever which controls the cam shafts. This subject-matter does not appear in the Complete Specification as accepted.