US1283297A - Internal-combustion engine. - Google Patents

Description

F. H. QUHVIBY. INTERNAL coMBusTloN ENGINE.

APPLICATION FILED MAR. 7. |918.

Patented Oct. 29, 1918.

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F. H. QUIMBY. INMERNAI.V COMBUSTION ENGINE.

APPLJCTION FILED MAR. I 1918.

Patented Oot. 29, 1918.

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F. H. QUIMBY. INTERNAL CUMBUSTION ENGINE.

APPLICATION FILED MMI. l. 191s.

1,2397.. I Patented. Oct. 29, 1918,

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Specification of Letters Patent.

INTERNAL-COMBUSTION ENGINE.

Application filed March 7, 1918. Serial No. 221,003.

To all 'whom t may concern:

Be it known that I, FRANK H. QUIMBY, a citizen of the United States, residin at Troy, in the county of Rensselaer and l tate of New York, have invented certain new and useful Improvements in Internal-Combustion Engines, ofwhich the following is a specification, reference being had therein to the accompanying drawing.

The invention relates to internal combustion engines and has for its object to provide an internal combustion engine, wherein the gaseous mixture from the carbureter will be taken into the engine through the crank easings, thence through passages of the cylinder casings to the intake valves. The intake valves being operated by means of cams carried by a cam shaft, said cams being so disposed that they will engage the ends of the valve stems and force them .inwardly against the action of springs, thereby admitting kgaseous, charges to the combustionchambers of the cylinders of the engine. y

A further object of the invention is to provide a valveactuating mechanism, wherein the intake valves will be actuated by cams carried by a rotating cam shaft, also to provide means whereby the said cam shaft may be disposed nearer to, or farther away from the ends of the valve stems, thereby allowing, when the cams engage the ends of the valve stems an increased or diminished amount of gaseous mixture to enter the combustion chambers of the cylinders.

A further .object of the invention is to provide a valve controlled 'mechanism for internal combustion engines, comprising a shaft, having' eccentrics at its ends, said eccentrics being mounted in liXed bearings and a rotatable cam shaft telescopically, but rotatably mounted on the same and connections between the cam shaft and the crank shaft, whereby the cam shaft will be rotated, thereby causing the engagement of the cams with the ends of the valve stems. Also to provide means on the eccentric shaft, whereby the eccentrics may be oscillated in their bearings so that the cams may be brought closer to or farther away, from the ends of the valve stems, so as to increase or diminish the size ofthe gaseous charge admitted to the cylinders of the engine. It being understood that the location of the valve actuating cams may 'be varied or changed according to the kind of engine to which it is applied. For purpose of illustration a four-cycle engine is shown, that is to say, the piston makes four strokes to complete a cycle of operation. However, it

.is obvious that the mechanism may be apratenteaoet. ae, raie. i

ceeds, the invention resides in the details of construction and combination and arrangement of parts hereinafter described and claimed, it being understood that changes in the precise'embodiment of the invention herein described may be made within the scope of whatis claimed without departing from the spirit of the invention.

Figure 1 is a side elevation of the upper end of a four-cylinder internal combustion engine, showing the valve mechanism applied thereto. y

Fig. 2 is a vertical longitudinal sectional view of la portion of the engine and valve mechanism.

Fig. 3 is a vertical sectional view on line 3-3 of Fig. 2, showing the starting of the intake stroke.

Fig. 4 is an enlarged detail view of the valve` and actuating mechanism, showing the same in intaking position.

Fig. 5 is an enlarged detail view of the valve mechanism showing the eccentric shaft disposed nearer the ends of the valve stems.

Fig. 6 is a perspective view of the cam sleeve.

Fig. 7 is a perspective view of the eccentric shaft.

Referring to the drawings 1 designates a conventional p form of four-cycle engine, which comprises cylinders a, b, c, and d' Each cylinder is provided with the usual crank casing 2, said casings are partitioned from each other by walls 3, however, these walls may be eliminated, if desired. The crank casings are air tight and are so constructed that they will retain the gaseous mixture when forced therein from the carbureter. The gaseous mixture enters the crank casings through ports 4 in the sides intake manifold being in turn connected to the carbureter port (not shown) by means of the pipe 6. Threaded into the upper ends of the cylinders as at 7 are cylinder heads 8. The cylinder heads 8 are provided with chambers-9 for the reception of the gaseous mixture from the crank casings 2, which enter the same through the passages 10- formed by the walls 11 of the Water cooling jacket 12 of each cylinder. The passages 10 terminatel in registration with openings 13 in the walls 14 of the cylinder heads. The upper wall 15 of each cylinder head is provided with upwardly and downwardly extending bosses 416 and 17 forming bearings 18 for the reception of the valve stems 19. The lower walls 20 of the cylinder heads are provided with intake vports 21 in which the valves 22 seat. Threaded to the valve stems 19 are sleeves 23 having enlargements 24, which are provided with annular flanges 25 and between the enlargements 24 and theupper walls 15 of the cylinder heads coil springs 26 are disposed, these coil springs keep the valves normally in engagement with the valve seats 21. Threaded lupon the valve stems 19, as at 27 are cam engaging members 28 which comprise internally threaded sleeve portions 29 and( enlarged cam engaging portions 30. The springs 26 are of such a tension that they will keep the valves 22 in engagement with their respective valve seats until the valves are forcibly opened, by the valve actuating mechanism.

Secured to the sides of the cylinders a and d by means of bolts 31 or brackets 32, having` bearings 33 in which eccentrics 34 are rockably mounted. The eccentrics 34 are provided with rectangular apertures 35 for the reception of the rectangular ends 36 of the rockable shaft 37, said shaft being provided with bearing enlargements 38 and reduced portions 39. The enlargements 38 are provided with lubricant grooves 40, the ends of the rockable shaft having threaded reduced portions 41, one of said reduced portions being for the reception of a cap plate 42, which is threaded and pinned upon the reduced portion by means of a pin 43,the other reduced portion 41l of the shaft 37 receives the operating arm 44, which is provided with a lug 45 engaging an aperture 46 in the eccentric 34, and being held in said position by lock nuts. Connected to the arm 44 is a rod 47 which leads to any suitable part of anlautomobile so that the shaft and eccentrics may be easily rocked when it is desired to dispose the same in various positions relative to the ends of the valve stems. Telescopically fitting and rotatably mounted upon the bearings 38, of the shaft 37 is a sleeve 47, said sleeve beingprovided with cams 48. The cams 48 are keyed to the sleeve 47a by means of the keys 48*1 andare adapted to'ro'A tate therewith. Thel sleeve is provided with oil apertures 49, which allow thelilling of the spaces 50 formed by the reduced portions 39 of the shaft 37 and the rotatable sleeve '47 with lubricant, theoil apertures 49 being closed by screws '51." Keyed to the end 52 of the sleeve 47a, by means of a key 53 is a sprocket 54 and extending around the sprocket 54 and a Vsprocket 55 which rotates with the crank shaft 56 is a noiseless chain 57. When the invention is applied to a fourcycle engine itis necessary that the sprocket be of such a size as to make two complete revolutions to one complete revolution of the sprocket 54, however this may vary according to the type of engine upon which the device is used. The crank shaft is provided with the usual cranks 58, to lwhich connecting rods 59 are pivotally secured, the connecting rods are in turn pivotally secured to wrist pins 60 of the pistons 61. Spark plugs 62 are threaded into the upper part of the cylinders as at 63 and are controlled by the usual spark control mechanism (not shown).

The operation is asfollows: When the piston starts its intake stroke, the cam 48 will force the valve 22 out of engagement with its seat 21. The sprocket 55 making -two revolutions to one revolution made by the sprocket 54 it is obvious that by the time the piston reaches the end of its intake stroke, the cam 48 will be in the position ton starts its compression stroke and when it reaches the end of its compression stroke the cam 48 will be in the position shown in dotted lines at 48", at which time the charge is ignited and the piston starts downwardly upon its impulse stroke, when it reaches the end of its impulse stroke, the cam 48 will be in the position as shown at 48. The burnt gases will escape through the exhaust manifold 64, when the same is uncovered by the piston on its downward impulse stroke. After the impulse stroke and exhausting of burnt gases the piston will move upwardly for the starting of another intake stroke.

It will be seen that when it is desired to iucrease the amount of gaseous mlxture admitted to the combustion chambers of the cylinders, it can be easily accomplished by rocking the shaft 39, which is carried by the .eccentrics `34, thereby loweringthe axis of the rotatable sleeve and consequently bringing the noses of the cams 48 nearer to the ends of the valve stems, so that as the cams rotate the valve 22 will be forced farther out of engagement with their valve seats and consequently allow a greater amount of the gaseous mixture to enter the combustion chambers of the cylinders.

Lubricant cups 65 are threaded as at 66 into the brackets 32 and furnish lubricant to the eccentric bearings 35.

The invention having been set forth wha lis claimed as new and useful is :--h l. In an internal combustion engine comprising a cylinder, a cylinder head secured to said cylinder, a valve carried by said cylinder head and normally held closed, a rockable shaft disposed over 'the ends of the valve stem, a rotatable sleeve telescopically and rotatably mounted upon the rockable shaft and provided. with a cam rigidly secured thereto and means whereby the cam may be disposed at different distances from the end of the valve stem.

2. In an internal combustion engine co1nprising a cylinder, a cylinder head secured to said cylinder, a valve carried by saidV cylinder head and normally held closed, a rockable shaft disposed over the end of the valve stem and having eccentrics at its ends mounted in stationary bearings, a rotatable sleeve telescopically and rotatably mounted u on the rockable shaft and provided with a rigid posed over the valve stems and having eccentrics at its ends mounted in'bearings and having reduced portions, a rotatable sleeve telescopically and rotatably mounted upon the rockable shaft, means for rotating the rotatable shaft, cams rigidly secured to the rotatable shaft and means whereby the eccentrics may be rocked in their bearings so that the cams may be disposed at dierent distances from the valve stems.

ln testimony whereof I hereunto ax my signature.

FRANK n. QUIMBY.

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