US1294077A - Operation of fuel spraying or injections valve for internal-combustion engines. - Google Patents

Description

H. E. FENCHELLE.

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OPERATION OF'FUEL SPRAYING OR I IIIECTION VALVES FOR INTERNAL C APPLICATION FILED DEC.'6,I9|1- Patented Feb. 11, 1919;

Inventor.

W. L [1:46.] r7 2 241146 1 444x77 UNITED STATES Px'rmv'r OFFICE.

HUGH EMILE FENCHELLE, OF GENOA, ITALY, ASSIGNOR T0 WILLIAM L. KANN, OF PITTSBURGH, PENNSYLVANIA, TRUSTEE.

OPERATION OF FUEL SPRAYING OR INJECTION VALVES FOR INTERNAL-COMBUSTION ENGINES.

Patented Feb. 11, 1919.

. Application filed December 8, 1917. Serial No. 205,888.

To all whom it may concern:

Be it known that I. Hocrr EMILE Fen- CHELLE, a British subject, residing at Via XX Settembre 34/4, Genoa, in the Kingdom of Italy, have invented certain new and useful Improvements in Operation of Fuel- Spraying or Injection Valves for Internal- Combustion Engines, of which the follow ing is a specification.

This invention relates to the operationof fuel spraying or injection valves of internal combustion engines, particularly those employing the, Diesel type of injection, and provides an improved construction of controlling mechanism.

According to this invention a cam oper' aged sliding member angularly adjustable a out the cam axis is formed with a bearing surface different portions of which are brought opposite the end of the valve lever by t e angular adjustment, the extent of movement of the lever depending upon the portion of the said bearing surface which is operative. In the construction preferred the sliding member is formed with two bearing surfaces separated by 9. ga or de ressi'on which when brought opposite the ever end leaves the valve unoperated'by the cam. One of the said two surfaces is employed for forward movement of the engine and the other for reverse movement, and each of them'is so constructed that it is wholly within an arc of a circle struck from the axis of the cam. shaft at a radius ual to the distance of the outer edge of t is surface from the said axis, this outer edge correr of which projects the spending to the maximum. ower of the engine. When the arm is a justed for re duced ower, a certain amount of lost motion wll be provided between the cam and the valve lever, the amount of such lost motion being dependentupon the position of the said am.

In order that the said invention may-be more clearly understood and readily carried into efiect the same will be more fully described with reference to the accompanying drawing, which shows in elevation with parts in section, an injection valve and valve operating mechanism embodying this inven- A is the valve body through the upper end I valve stem 0. B is the va ve lever one endof which actuates 'cedes from the the valve stem a through the adustable not a on the end of the stem. is the valve cam having the two cam surfaces 0 and mounted upon the cam shaft 0, which turns at half the speed of the engine shaft.

D is the sliding valve actuating member carrying the cam roller d and mounted in the sleeve e of the arm E which is pivoted to turn about the axis y of the shaft 0.

is an eccentric effecting the adjustment of the arm E around its axis 3 through the eccentric rod f.

The forward end of the sliding member D acts upon the nose I) on the end of the valve lever B and is provided with the two bearing surfaces cl and d for forward and reverse driving of the engine and with the recess d" separating the two bearing surfaces. As s own on the drawing an are as of a circle drawn from the axis y of the cam shaft 0' through the outer edges of the two surfaces d, d lies entirely outside these surfaces, which may with suitably formedcam surfaces c, be made flat and lie in the same plane, which is therefore tangential to an arc concentric with the are m,

ut struck nearer to the axis In the position shown in the drawing t e arm E is at or near the position of maximum power, with a point I on the outer portion of the surface d opposite to the nose I) of the valve leverB. At this point very little lost motion is allowed between the cam and the lever, since the roller d almost rests upon the surfaces of the cam so that the cam surfaces a begin to operate the lever immediatel thelr leading edges reach the roller d. I however the power of the engine is to be reduced the eccentric F is turned by suitable gearing, which may be under the control of the engine governor, so that the arm E is drawn down around its axis y bringingla point on the surface (1 which is nearer .t e center of the member D op osite to the nose 6 of the valve lover. The arger the displacement of the arm E the eater is the gap between the nose b and t e operafive point of the surface d, since this reare m as it approaches the. axis of the member D, and the lost motion between the cam and the valve lever therefore increases with the displacement of the arm E and the period during which the lever is operated and the injection valve adjustmept of throu held open is reduced in accordance with the smaller portion of the cam surface 0 coming into effective operation.

The adjustment of the arm E in the direction just mentioned, While varying the amount of clearance or lost motion between the cam and lever, at the same time shifts the position of the roller (Z on the surface of the cam against the direction of rotation of the cam so that the cam surface 0 reaches the roller d at an earlier point on the engine stroke. As however, the cam surface 0 does not become effective until the member D has taken up the lost motion allowed for, only the upper or outer portion of the cam surface serves for valve actuation, the effective amount of the portion depending upon the the arm E. By suitably shap e cam surfaces 0 in accordance with the shape of the bearing surfaces cl, 0' the displacement of the arm E around its axis may be made just to compensate for the delay due to the lost motion, so that the point in the engine stroke at which the cam surface 0 opens the injection valve ma re main constant for any adjustment 0 the device The period e remains open, howupon the adjustment valve lever actuatin during which the val i ever, depends entirely of the arm E and the consequent variation in the amount of lost motion between the cam and the valve lever through the bearing surface d or d of the member I). The period of opening of the valve therefore may be made to correspond with reasonable accuracy to the amount of fuel being delivered to the valve and to the consequent power developed by the engine so that there is no danger of any fuel which may remain in the valve being drawn into the cylinder after the supplyv to the valve is cut off.

On further movement of the arm E h the eccentric F the steadi y reducin the period of opening of the injection va ve, ma be moved completely ast thenose/b so as to bring the recess 3 opposite this nose. In this osltion of the device the valve remains entirely unoperated as the cam surfaces a merely surface d, after move the member D forward without transmitting such movement to the valve lever. In this position the fuel is entirely out ofl" from the engine, which therefore stops.

On further movement of the arm E the second bearin surface d is brought opposite the nose of the valve lever, this surface coming into operation for reverse running of the engine. The action of the valve device is precisely similar for both forward and reverse running, the period of opening of the valve and consequently the power of the engine increasing as the outer portion of the surface d is brought opposite the nose I). As the surface d is formed in accordance with the shape of the cam surfaces 0 the time of opening of the injection valve can be kept constant for any adjustment of the valve during reverse running, as in the case of forward runnin already 'dealt with.

It is preferred to mafie the adjustment of the arm E between the two extreme positions, for forward and reverse running at full power, within an angle of about 15 degrees and to allow of the operation taking place within this small angle the cam is provided with the two cam surfaces 0 and is driven at half the usual cam shaft speed.

What I' claim and desire to secure by Letters Patent of the United States is I The combination with a valve lever to be actuated, said lever having its power arm provided with a convex nose portion, of a rotary cam, a sup ort which is angularly adjustable about t c axis of. the cam, a transmission member slidably mounted on said support and arranged to be actuated by the rotary cam, said member having a contact face for engagement with the said nose portion, said ace having two separated plane bearing surfaces lying within a circle struck from the axis of the cam and meeting the outer edges of said surfaces, and means whereby the said support maybe gradually shifted to vary the-contact point between said nose portion and either-one of said sur faces; substantially as described.

HUGHEMILE FENCHELLE.

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