US1617378A - Arrangement for governing internal-combustion engines - Google Patents

Description

Feb. 15, 1927. 1,617,378 Y A. U. $.DAN1EL`ssoN ARRANGEMENT FOR GOVERNING INTERNAL COMBUSTION ENGINES 1923 2 sheets-sheet 1 Feb. 15 1927.

A. U. s. DANIELssoN ARRANGEMENT FOR GOVERNING INTERNAL coMUsTIoN ENGINES Filed April 11, 1923 2 Sheets-Sheet 2 and fuel not be able to-be injected into the..

Patented Feb. 15, 1927.

AXEL UNO ST'URE DHANIELSSON, OF ULFS'UN DA,

SWEDEN, ASSIGNOR T0 AKTIIEBOLAGET ATLAS DIESEL, OF STOCKHOLM, SWEDEN, .A CORPORATION OF SWEDEN.-

ARRANGEMENT FOR GOVERNI'NG INTERNAL-COMBUSTION ENGINES.

Application mea April 11, 1923,seria1 No. 631,439, and in sweden April 19, 1922,

The present invention relates to an arrangement for governing internal combustion engines provided with fuel pump or the like with the aid of a so called overflow' valve actuated by spring or the like, which according to changes in the loading on the engine andby means of a governor opens earlier or later at the end ofthe working stroke of the pump plunger and thereby exhausts, a greater or smaller quantity of the fuel coming from the pump whereby the fuel quantity injected into the working cylinder will be suitably adjusted. According to the.

invention the overflow valve isadapted to open outwards from the fuel inlet piping between the pump and the working cylinder. Thus the fuel pressure actuating the valve is ltaken up by the valve spring and the governing device will 'be relieved in a corresponding degree. By vthe overflow valve being opened outwards against the pressure of thespring, ete., said valve also is able to serve as a safety valve so that the pump and parts belonging thereto will not be exposed to disadvantageous stresses should the admission valve or sprayer of the engine hitch cylinder.

In the accompanying drawings:

Fig. 1 is a vertical section of the upper part of an internal combustion engine provided with a governing device according to the present invention. Figs. 2 and 3 are vertical sections of two other embodiments of the governing device.

1, Fig. 1, is a head clamped in the upper part of the working cylinder 2 of the engine. Threaded into the head is the cylinder 3 of a fuel pump, the plunger 4 of which is actuated by means of a bell crank lever 6 pivoted on a fulcrum 5 being provided by means of a link 7' with a rod 9 connected through a guiding tube 8 to the crank shaft of the engine and actuated by a cam disc or the like on said crank shaft.

In order to prevent lost motion between the lever 6 andthe plunger 4 the latter is pressed against the lever by. means of a spring 10. The fuel is injected into the cylinder 3 through a channel provided with a check valve and is pressed by the plunger through a channel 11 leading to -a valve of any known construction as for instance a needle valve. The constructionV of the valve is such that it opens against the pressure of in the head, said leverA end of the working stroke a spring lby means of the fuel coming from, the pump and admits the same in the com' bustion chamber of the engine and is closed as soon as the pressure` on the fuel in thev channel 11 ceases. v

The arrangement shown in Fig. 1 for governing the fuel supply consists of va valve 12 opening outwards and connected by means of a channel to the channel 11. The valve 12 is kept in closed position by means of the pressure of a frame like member 13 movable 1n a' guide 14 and actuated by a spring 15. Supported in the vframe 13 -is a roller 16. From the bell crank lever 6 a lever 17 extends under the rollerl 16. Between the roller 16 and said lever a lwedge 18 is movable and articulated to .a two armed lever 2() pivotally supported at 19. The lever I2O is connected by means of a link 2l to a side arm 22 on the tube 8'. The tube 8 is4 pivotally supported and adjusted by they governor of the engine.

By means of the driving device for the plunger 4 hereinbefore described' said y plunger begins always its working stroke or '80 its inward movement at the same position of crank. Further the length of the working stroke is always the same and thus the fuel quantity, which is invariable and injected during the movement of the plunger would be injected into the working cylinder 2 also by reduced loading on the engine if the fuel would not be partly exhausted through the valve 12, said valve being bymeans of a piping connected to the suction piping of the 90 fuel pump. If, however, the 4loading on the engine be reduced the governor pulls by means of the gear 8, 22, 21, 20 the wedge 18 further in between the lever 17 and the roller 16 so that the valve 12 opens at the 95 of the plunger 4 and part of the lfuel is conveyed from the pump back to the suction piping thereof.

If the loading on the engine increases the governor pulls the wedge outwards so that the' valve 12 will be opened later and "thus an increased quantity of fuel will be injected into the cylinder 12. In such manner the supplied quantity of fuel will be adi justed according to the loading on the engine. l i.

Should the inlet (needle) valve or s rayer of the4 engine for some reason hitch, or instance be pitched, so that fuel can not be sucked into the cylinder 2 the fuel is able to 110 .In the embodiment shown in Fig. 2 the plunger 4 may by means of a link -be connected to a bell crank lever similar to the lever 6, Fig. 1, and driven in the same manner as the latter. 23 is the spring actuated suction valve and 24 the suction piping of.

the pump. Fuel is injected into the cylinder 3 through the channel 25. The governing valve l2, which also in this case opens outwards, is actuated b a bar 26 actuated by a spring 27 and sli able `in a guide 28. A two-armed lever 30 excentrically pivoted on a fulcrum 29 extends with one arm under a flange 31 on the bar 26 andby. altered loading on the engine serves to raise the bar 26 at an earlier or later period ofthe Working stroke of the plunger 4. Plunger 4 and lever 30 may be actuated in the same manner as the plunger 4 in Fi 1, and the movement of the lever 30 is matgle adequate to that of the plunger 4 and in such a manner that the inner arm of lever 30 is raised upwards during the working stroke or inward movement of the plunger. The eccentric fulcrum 29 is changed over by means of a gear (not shown) from the governor of the engine,

` for instance from the tube 8, Fig. 1.

By reduced loading on the' motor t-he eccentric fulcrum 29 is turned in such 'a manner that the lever 30 is raised and the inner arm thereof touches the flange 31 and raises the bar 26 at an earlier period of the working stroke\of the plunger 4. The

fuel not necessary for driving the engine then is able to open the valve 12 and exhaust through the same. By increased loading'the lever 30 is lowered and raises the bar 26 at a later period so that super? fluous fuel will exhaust later through valve 12, the latter thus serving also in this case as a safety valve.

As the governing valve A12 is preferably so arranged that air which may still be `kept open by the lever 30.

present in the pump and channels will' exhaust through the same a spring .actuated valve 32 should be positioned between the valve 12 and the suction piping 24 in order to prevent such air to return into the chainnels at the beginning of the suction stroke of the plunger 4 when the valve 12 is still In order that the governing valve 12, Fig. 3, may serve also forthe valve 32, Fig.

y ing of the valve.

2, for` the purpose mentioned above a spring 33 is arranged between the valve 12 and bar 26. The valve 12 serves as governing and safety valve in the same manner as the ovalve 12 in Figs. 1 and 2. As'soon as the overflow valve only need overcome the' pres-A sure of the spring 15 resp. 27 necessary to keep the valve closed. On account of the valve opening outwards the same may be given a small area of passage which results in a reduced fuel pressure on said valve and the possibility of using a lighter spring 15 resp. 27. The power, .which the governing device need develop during the opening of the valve, lis consequently considerably reduced this being of essential value for the eccentrical device changed over by the governor and shown in Figs. 2 and 3 because said governor on account of the reduced counter-pressure of the spring is able easier to overcomethe pressure being actuated on the eccentric disc during the open- The governor thus may be made very sensible.

The governing devices now referred to may of course be modified in several re spects without giving up the idea, upon which the present invention -is based.

I claim:

In an internal combustion engine the combination of an overflow valve communieating with the fuel charging passage of the working cylinder of the engine.` said valve comprising a body, a member, yield-` able means locateud between thesaid member and the said body, and yieldable' 'means actuating the member towards the seat oi the said body, means for supplying the fuel, and means controlling the valve and releasing the body permitting the same to be 4opened by the fuel pressure, as a quantity AXEL UNO STURE DANELSSON. y

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