US1377877A - Internal-combustion engine - Google Patents

Description

W. I. DUNN. .INTERNAL COMBUSTION ENGINE' APPLICATION FILED f Patena May 10,1921.

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Application filed March 5, 1920. Serial No. 363,625.

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Be 1t known that l, VILLIAM J. DUNN,

v a subject of the King of Great Britain, and

resident of the city of Montreal, in the Province of Quebec and Dominion of Canada, have invented certain new and useful Improvements in lnternaLCombustion Engines. of which the following is a full, clear. and exact description.

' rl'his invention relates to improvements in valves for internal combustion motors, and the object of the invention is to provide a simple and 'easily constructed valve geancomprising a minimum number kof parts. Y

A further object is to provide for the quick `intake and release of gas to enable an engine toy operate eiiciently at high speed.

it. still further object is to provide means for efficiently lubricatingr and cooling the valve gear.

The device `consists briefly of a jacketed head containing a pair of tubular valves.

conduits are connected to one end of said valves and a driving mechanism to the opposite end, so that the valves may be rotated Within the head to bring ports therein into and out of communication with ports in the head. Means are provided for lubricating the valves throughout their length andalso for insuring a flow of (tooling medium uniformly around. the valves.

ln the drawings which illustrate the invention:

Figure 1 is a fragmentary vertical cross sectional view of anengine, in. the'central plane of one of said cylinders.

Fig. 2 is a longitudinal section on the line 2 2, Fig. i.

Fig. 3 is a fragmentary plan View.

Referring more particularlyto the draW- ings, 11 designates the cylinders of an engine provided with a Water jacket 12 and preferably cast ea 6200. 13 designates a cylinder head having a Water jacket 14 cornmunicating with the cylinder jacket. Within the head jacket, and suitably supported, is a longitudinally disposed tubular portion 15 having two bores Apreferably arranged axially parallel. VEach of these bores is slightly tapered from end lto end, as clearly shown in Fig. 2, and each bore opens through the ends of the head. lWithin the bores are ievolubly mounted tubular valves 16 and 17 having ports 12 and 19 formed through the waits thereof and positioned to Specification of Letters Patent.

INTERNAL-COMBUSTION ENGINE;

Patented communicate with ports 20 and 21leading through the head to the cylinders. The length ofthe ports 2O and 21 is substantially equal to the diameter of the Acylinders and the ports are located as nearly as' poslsible on the diameter of the cylinder. lin

order to reduce as much as possible the volume or capacity of these ports and to re duce the size of openings in the cylinder head Without restricting any of the ports these ports may be inclined and allowed to merge Where they communicate with the cylinder as clearly shown in Fig. 1.

llt will be noted that the Walls of the valves are of uniform thickness throughout and also that the-Walls of the part 15 inclosing the valves are as'much as possible of uniform thickness throughout in order to insure uniform expansion and contraction and thus avoid imperfect fitting of the valves. A

An oil passage 22 is provided in the part 15 parallel with die valves. Duets 23 are provided radiating -from this passage and communicating with thefvalve receiving bores at points between the ports, so that thleducts Will never bring the interior of thevalves into communication with the oil passage. An oil supply pipe 2l`communicateswith one end of the passage andan overHoW pipe 25 with the opposite end. @il is preferably supplied from the crank case of an engine may io. iaai.,

or any suitable reservoir by means of 'a pump connected to the pipe 24 and the surplusfof oil allowed to return to the crank case or reservoir throughthe pipe 25. ln

vthis Way there willalways be an adequate by any suitable means such asa gear 28 Y which may be connected by a chain with the crank shaft. I

- ln order to insure adequate and uniform cooling of the valves, a rib 29 is provided extending from the part. 15 to the top of the head jacket, thus dividing the jacket longi- E sure a uniform flow tudinally into two parts.

A cooling medi/um outlet is provided at one Aend ot the head. The rih 29 preferably extends into this outlet to at least the end of the head, so as to inoi' cooling` medium up each side of the cylinder block and over each valve.

While the device has been illustrated only as applied to an engine having two cylinders, it will be obvious that it is in no way'liml ited to any particular number of cylinders.

Fora four-cycle engine, the valves will obviously be driven at half the crank shaft speed and for a two-cycle engine at crank shaft speed. For each type of service, the ports will obviouslyv require to be suitably proportioned to insure proper area of opening and proper duration of opening.

The operation of the device is as follovvsg--The valves are revolved by power taken from the engine shaft, the incoming gas' flows through one valve and at proper intervals througlrthe ports of this valve and the ports 2() into the cylinders, Where it is compressed and exploded in the usual manner. r1`he exhaust gases flow at properly timed intervals through the ports Qiand 15) into the valve 17, manifold 26. ont the, engine, oil is circulated under pressure through the passage 22 and a certain proportion of it flows through the ducts 23 and from it through the' During the entire operationv two parts, a circulation-is compelled around each of the valves. n

Having thus described my invention, what l. ln an internal combustion engine. a cylinder, a head therefor, a pair of tubular valves revoluhly mounted in said head, ports in the valves and head, means at one end of the head Jfor revolvingl said valves, and a single maini'fold member attached to the opposite end of the head having inlet and outlet passages therein communicating` with the respective valves, said manifold holding` the valves in operative position in the head.

2. In an internal combustion engine, a cylinder, a head therefor, a pair of valves located in said head, ports between the valves and-cylinder, said ports merging into one another adjacent their entrance into the cylinder, whereby a single port opening is presented to the cylinder havin` an 'area substantially the same as the-area of either of said ports.

ln Witness whereof, I have hereunto set my hand.

WLLIAM J. DUNN.

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