GB563656A - - Google Patents
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- Publication number
- GB563656A GB563656A GB563656DA GB563656A GB 563656 A GB563656 A GB 563656A GB 563656D A GB563656D A GB 563656DA GB 563656 A GB563656 A GB 563656A
- Authority
- GB
- United Kingdom
- Prior art keywords
- exhaust
- valve
- cam
- ports
- cylinder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
563,656. Controlling gas flow in internal-combustion engines. NESFIELD, A. C. Jan. 19, 1943, Nos. 970 and 8735. [Class 7 (vi)] A two-stroke internalcombustion engine has a main exhaust port (or valve) and a positively-controlled auxiliary exhaust poppet valve in series with the main port and arranged to close immediately after the first surge of exhaust gases from the cylinder and prevent return flow back into the cylinder. The resulting low pressure in the cylinder is utilised to assist in re-charging the cylinder, the inlet being opened immediately after the closing of the exhaust valve. In Fig. 1, the exhaust ports 12 communicate with a conduit 14 and the auxiliary poppet valve 17 is operated by a rocker 18 pivoted at 19 and actuated by a cam 20. The valve 17 is opened before the ports 12 are uncovered by the piston and after ports 12 have been opened it is quickly closed when the cam reaches the steep descending part 21. The inlet ports 13 are then opened, thus allowing quick inrush of the charge into the cylinder. In a modification, the main inlet and exhaust ports.are formed in a sleeve valve having reciprocating and/or rotary movement. In this form the exhaust ports are adjacent the cylinder head. As before, the auxiliary poppet valve is closed immediately after the opening of the exhaust ports. In another modification, Fig. 3, a poppet inlet valve 31 is actuated from 'a cam 37 through push rod 36 and rocker 35. The exhaust port 12 is controlled by the piston 11 and the auxiliary poppet valve is operated by a cam on shaft 40. The cam 20 is driven from the crank-shaft through gears 38, 42 and 41, and in order to provide fine adjustment of the timing of the cam-shaft 40 the wheel 41 is slidably keyed to a bush 44 having a pin engaging a helical groove in the shaft, the bush being moved axially by a hand wheel 48 acting through screw-and-nut 50 and lever 52. In a modification, Fig. 5, this timing is varied automatically according to engine speed. For this purpose the wheel 41 drives a wheel having a flared part 62 engaging a number of balls 65 moving in radial grooves in a spring-pressed plate 63. As the speed increases the balls move outwards to impart axial movement to the plate and actuate a lever 67 which operates the bush 44. The cam 37 may also be driven through a timing device of either of the forms described above. The timing may be such that the main exhaust ports open about 120 degrees after top dead-centre and continues for about 30 degrees of crank movement at which point the auxiliary exhaust valve closes. At about the same moment the inlet valve opens and continues open until bottom dead-centre. In some cases the inlet opening may overlap the exhaust opening by about 5 degrees.
Publications (1)
Publication Number | Publication Date |
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GB563656A true GB563656A (en) |
Family
ID=1748906
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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GB563656D Active GB563656A (en) |
Country Status (1)
Country | Link |
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GB (1) | GB563656A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5081963A (en) * | 1986-09-04 | 1992-01-21 | Galbraith Engineering Pty. Ltd. | Reciprocatory machines |
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- GB GB563656D patent/GB563656A/en active Active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5081963A (en) * | 1986-09-04 | 1992-01-21 | Galbraith Engineering Pty. Ltd. | Reciprocatory machines |
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