US1687473A - Rotary valve for explosive engines - Google Patents

Description

' o, L. DUGGER ET AL ROTARY VALV E FOR EXPL OSIYE ENGINES- Filed July 51, 1926 INVENTOR OscarLDu er CH/184551 1. flusg a,

. ATTORNEYS Oct. 9, 1928; 1,687,473

/ I o. L. DUGGER Er AL ROTARY VALVE FOR EXPLOSIVE ENGINES Filed July 31, 19 26 2 Sheets-Sheet 2' I N VEN TOR.

OJaarLDayyee;

ATTORNEYS Patented @ct. 9,1928.

UNITED. STATES v 7 14531473 PATENT orrlcs.

OSCAR L. DUGG-ER AND CHARLES M. BUG-GER, F EVANSVILLE, XNDIANA, ASSIGNORS TO ROTARY VALVE COMPANY, OF EVANSVILLE, INDIANA, A. CORPORATION OF INDIANA.

ROTARY VALVE FOR Application filed July 31,

This invention relates to rotary valve mechanism for internal combustion engines. One of the objects of the invention is to provide improved means for packing the valve at the point where it serves the respective cylinders of the internal combustion member to prevent explosive pressure from passing said valveand'toprovide such a pack ing that will reduce the bearing pressure of the packing on the valve to a minimum and to insure a perfect packing of the valve under varying conditions of expansion and contraction of the metal parts due to variation in heat conditions to which the valve and its packing are subjected.

For the purposeot disclosing the invention certain embodiments thereof are illus trated. in the accompanying drawings in which Fig. 1 is a side elevation partly insect-ion of an engine embodying the invention;

Fig. 2 isa transverse'sectional view;

Fig. 3 is a sectional view of thepacking shoe;. l f i Fig. list a top. plan view of the packing shoe;

Fig. 5 is a transverse sectional view,looking from beneath otoneof the packing shoes; I i

'Fig. 6 isa bottom plan View packing shoes;

Fig. 7 is a top planview of o'neof the packing shoes showing a modified form of oiling means; c

Fig. 8 isa side elevation of the packing shoe, the associated partsbeing shown in section, and showing an oil feed means;

Fig. 9 is a detail section of the shoe shown in Fig. 7. V

The invention is illustrated as applied to a four cylinder combustion engine of the type wherein the combustion occurs inthe ends of the cylinder and to this end'the cylinderf'block 1 is provided with cylinders 2 45 ported. at their tops and having the usual pistons 3, the block beingprovided with the usual water jackets l.

The cylinder head-comprises mainpart 5 and a detachable cap ortop section 6, each 50 being hollow to provide water jackets 7 whose proximity to the valve chamber .8 is

utilized for cooling. "Bolts 9' which pass through the sections 5 and 6 are adapted for of one of the.

securingthe sections together and for connectin them to the c linder block.

s y y EXPLOSIVE ENGINES.

1926; Serial No. 126,165.

It will be understood that suitable spark plugs 10 are provided for the cylinders to provlde tor :the ignition oi" the charge there- 1n.

The cap section 6 is provided with an intake manifold 11 on one side of the head 'which 'manit'old communicates with intake ports 12, one for each cylinder, and on the other side of the head is provided an e:; haust'manitold 13 communicating with exhaust ports 14, one for each cylinder.

The rotary valve 15 is formed in a single piece and extends tl'irough the valve 0118.1 iber 8 being journaled at each end in suitable bearings 16 and rotatably driven by a suitable drivingconnection 17 operated from the crankshaft or other moving part of the engine. This valv'e 15 is provided with cylindrical members 18 corresponding in number to the engine cylinders to be served, which members are recessed or. cut away as 19 to v form pockets to receive the charge from the intake and deliver the same to the cylinder and to-allow the exhaust to occur at proper times In the structure illustrated these pockets are arranged at quadrant distances apart in order to properly serve the respective cylinders.

The respectivemembers 18 are packed by and mounted to turn in packing shoes or bearings 20 on the under side and machined seats 21 on the upper side. Each packing shoe orbearing 20' consists of substantially rectangular shoe portions, the inner faces 22 of which are shaped-to the cylindrical members 18 and are suitably ground to make a proper joint therewith. Each shoe is provided with a rectangular port 28 where it bears onthe member 18 and this port is as out great'a'length as the pocket orrecess 19; By 9 having the port 23 rectangular the intake to and the exhaust from the cylinder through theport and pocket are in a given ratio, the admission of the charge tothe cylinder "is regular and the exhaust therefrom is carried out in a regular fashion as distinguished from the variability atdifierent points of the turning of the valve as with a circular port. With a rectangular port the turning of the valve will coverthe port in a regularly progressive fashion which-would not be the case if the port were of other than rectangular form. I

The bottom portion of the packing shoeis provided with a cylindrical neck 24 a portion llU End

of which takes a spring bellows formation as 25. This bellows construction is integral with the cylindrical neck of the shoe and forms a part of the neck. The neck 2 f fits within the circular intake opening 26 of the main part 6 of the head and the wallof this opening at its lower end is provided with an internal annular flange 27 on which the bottom of the neck 24 rests, this bottom portion of the neck being internally screw threaded. Fitting within the neck 2% is a conduit, or bushing 28 provided at its lower end with an annular clamping flange 29 bearing on the under side of the flange 2? on the main part 5 of the cylinder head and the bushing above the flange 27 is externally screw threaded. to engage with the screw threads on the bottom of the neck 24: so that when the parts are assembled the bottom portion of the neck 24: is securely clamped upon the annular flange 27 while the top portion of the necx is free to move vertically, it having a, sliding engagement with the bushing 28, which bushing at its top has its walls t pered as at 29. By this arrangement the bellows construction has a spring tendency to hold the shoe 22 upwardly against the faceofthe cylindrical valve head 18 and at the same time there is ample provision made for the downward movement of the head when the metal parts become expanded under the influence of the heat of the exploded charges. The inner di ameter of the neck, when the bushing 28 is in posltion, is greater than any dimension of the square opening 23 in the shoe and as a result there is formed on the under face of what might be termed the shoe proper a shelf or surface 30 the result being that when an explosion of the charge takes place in the 'he pressure exerted on thisshelf' tends to hold the shoe against the face of the cylinder rotary valve. As a matter of fact there is a certain balancing action which takes place on the shoe due to the tendency of the explosion of the charge in the cylinder. When this explosion takes place the pressure extends clear up against the face of the rotary cylinder or member of the valve and there is a tendency for this pressure to drive the shoe downwardly. This tendency is overcome by the pres sure on the shelf 30 exerted in an upward direction and the surfaces are so proportioned that the preponderance of pressure is on the shelf side or upwardly. I

In the structure which has been built embodying the invention it has been found that with the opening 23 one and one-half inches a circular bore in the neck 24: of two and oneeighth inches will provide a shelf having sufficient surface to give advantageous results. while the above dimensions have been given as producing advantageous results they are subject to variation depending upon conditions.

It will be understood however thatkey disposed on each side of the recess 19.

The key is normally pressed in L0 engagement with the face of the cylindrical member 18 by a suitable co l spring 35 and oil 18 sup .plied'by a stem 36 leading into the bore 33 and conncctediwith a suitable oilconduit' 37 through which oil is delivered under pressure. At predetermined points on the cylindrical member 18 there is provided pair of grooves 38 which, at onepointin the rotation of the member coincide with the openings 8% so that I at this point these openings are unsealed permitting a certain amount of oil'to pass into the grooves 38 and are again immediately sealed by the face of the rotary head as [these grooves pass awa I from the openings 34. Sufficient 'oil however is delivered to these grooves during-this period to properly maintain the rotary head lubricated.

in Figs-7 to 9 there is illustrated another method of lubricating the rotary valve. In the structure illustrated these figures the shoe 22 is provided with a longitudinally extending bore 39 having ports or openings 40 extending therefrom to the face ofthe shoe. This bore is connected by a flexible conduit 41 with an opening 42 extending through the water acket'and conn edited at its opposite end with a suitable conduit such as the conduit?! through which oil is supplied under pressure. The face 22 of the shoe is provided with a pair of transverselydiagonally grooves 4:3 terminating in holes is passing through theshoe and to the space beneath the same. The ports 40 areadapted to coincide periodically with the grooves 38 in the face of the rotary head 18 to permit the'escape of oil from the openings'etO to the face of the shoe during this period. Any excess oil will follow the grooves 43 and pass down through the openings 44, eventually finding its way back to the crank case of the engine.

Ne claiin as our invention:

1. In an internal combustionflengine the combination with a rotary valve, of a movably mounted ported packingv seated against the face of said valve and having a ported neck connecting the'packing with the engine cylinder, means for rigidlyconiiecting one end of said packing to'the engine cylinder, said neck having a flexible portion to permit relative movement between said packing and the cylinder and a hollow gland telescoping inside of said neck tofprevent said neck from receiving the pressure of the exploded charge.

2. In an internal coinbustionengine the combination with a rotaryvalve, of a movably mounted ported packing seated against extending" loo iio

the face of said valve and having a ported neck connecting the packing with the engine cylinder, a hollow gland telescoping inside of said neck and having means for rigidly securing the neck to the engine cylinder, said neck including a flexible portion permitting a relative movement between said shoe and the engine cylinder.

8. In an internal combustion engine the combination with a rotary valve, of a movably mounted ported packing therefor, a hollow gland or conduit stationarily mounted relatively to the engine cylinder and telescoping inside the ported packing and a flexible connection between said gland and the pack- 4. In an internal combustion engine the combination with a rotary valve, of a movably mounted ported packing seated against the face of said valve, a bellows conduit eX- tending between said packing and the engine cylinder having one end connected to the packing and the other end connected to the cylinder and a hollow gland telescoping inside of said conduit and preventing said conduit from receiving the pressure of the exploded charge.

5. In aninternal combustion engine the combination with a rotary valve, of a movably mounted ported packing seated against the face of said valve, a springbellows conduit extending between said packing and the engine cylinder and having one end connected to the packing and the other end to the cylinder and a hollow gland telescoping inside of said conduit to prevent said conduit from receiving the pressure of the exploded charge.

6. In an internal combustion engine the combination with a rotary valve, of a movably mounted ported packing seated against the face of said valve, a spring bellows conduit having one end connected to the packing, a hollow gland telescoping inside of the bellows to prevent the bellows from receiving the pressure of the exploded charge and having means for securing one end of the bellows to the engine cylinder.

In witness whereof, we have hereunto set our hands at Evansville, Indiana, this 4th day of March, A. D. one thousand nine hundred and twenty-six.

OSCAR L. DUGGER. CHARLES M. DUGGER.

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