US1188656A

US1188656A - Rotary valve.

Info

Publication number: US1188656A
Application number: US5119415A
Authority: US
Inventors: Jacob C Hoff
Original assignee: Individual
Current assignee: Individual
Priority date: 1915-09-17
Filing date: 1915-09-17
Publication date: 1916-06-27
Anticipated expiration: 1933-06-27

Description

1. C. HOFF.

"ROTARY VALVE.

APPLICATION men SEPT. u. |915.

Patented June 27, 1916.

J. C. HOFF.

ROTARY VALVE.

APPucATxoN FILED SEPT. l1, 1915.

Patented Jim@ 27, 1916.

2 SHEETS-SHEET 2- A mum expenditure of time.

,j JAcoB'c. Horn, or JEFFERSON-VILLE, INDIANA.

ROTARY VALVE'.

Specification of Letters Patent. Pgfnted Jun@ 275 1916.

Application led September 17, 19215. Serial No. 51,194.

To all whom it' may concern.'

Beit known that 1,'JACOB C. Herr, a

citizen of the vUnited States, residing at Jeffersonville, in the county of Clark and State of Indiana, have invented certain Anew. anduseful Improvements in Rotary Valves, of which the following is a specification.

The invention has for an object the improvement of rotary valves with a View especially to their application in internalcombustion engines, it-being one of the principal aims to simplify the inlet and exhaust connections and the driving connections.

It isalsc an aim to simplify the mounting of the valve proper and to enable the manufacture of the parts at a low cost, as well as to enable their assembly with a mini- It is a further purpose to enable the formation or mounting of a gear directly upon the valve close to the engine cylinder without liability of damage to the gear by heat.

Additional objects, advantages, and features of invention will appear from the construction arrangement andl combination of parts hereinafter set forth and shown in the drawings, where4 Figure 1 is a fragmentary vertical cross section of a cylinder of an .engine equipped with my invention. Fig. 2 is a horizontal. section of the valve. Fig. 3 is a detail of the valve proper. Fig. 4 is a side elevation of the cylinder head and valve.

-The type of engine to which the invention is adapted in the present case is the four,- cycle reciprocating piston type operating a crank shaft. y,

There is illustrated a cylinder 10 of a familiar type, which may be one of a number cast en bloc, in the present case, such as Would be closed by a removable cylinder head. A cylinder hea-d 11 is shown secured upon the cylinder in the usual manner. This head is planed centrally and provided with a port 12, the length of which is a little less than the diameter of the cylinder spaced a little from the axis of the cylinder, prefer'- ably parallel to the crank shaft of the engine, upon which the cylinder may be mounted, the details of the engine notbeing shown. By spacing the port to one side more room is gained for introducing the spark plug 13 into the cylinder head, the plug being shown as inclined outwardly at its upper part, av

suitable boss 14l having a diagonal tapped hole belng formed on the head for the in* troduction of the plug. A

Secured by suitable bolts 16 on the planed face of the head-there lis a valvecasing 15.

In a multiple cylinder engine 'the casing may extend over all the cylinders. It is a simple casting having a` cylindrical bore 17 therethrough stopping at a` shoulder 18 adjacent what will be known as the exhaust end, from which point a slightly reduced passage 19 extends through the end of the casing. vThe ends of the casing are planed, and it is provided with a footing or base 20 through which the fastening bolts 16 are engaged with the head 11. An exhaust pipe 21 may be secured to the exhaust end of the casing in registry with the passage 19, while at the opposite end, the casing is provided with a peripheral flange 22 at theupper part tp which 1s secured an inlet and retainer fitting 23. The casing is shown as constructed for a two-cylinder engine, and

has ports 24 therein to aline with those of the cylinder head all of which are located 1n the same position as shown at 12in Fig. 1, in each cylinder.

t Engaged revolubly in the casing 15 there 1s a valve member 25, abutting snugly against the shoulder 18 at its inner'end, and fitting snugly in the bore 17 throughout its length, the outer end of the valve stopping vat the inlet'end of the casing at its outer or peripheral part, while an extension is formed thereon having beveled gear teeth 26 cut thereon, by which Ithe valve is to be driven, as will be described. The valve is formed with comparatively thin 'cylindrical walls for themajor part of its length, gradugl ally thickened adjacent' the inletl end to form a proper body for the gear portion of the Valve, but still leaving a passage way 27 of a suitable diameter for the admission of gas to the engine. Two parallel longitudinal walls 28 are formed within the valve, extending from one side to the other, to each of which they are integrally joined. These walls stop short of the inlet end of the valve a distance, and have a transverse closing partition 29! thereacross. Their' opposite ends stop immediately adjacent the inner haust end, while the Space outwardly of these walls is in communication with the passage way 27 but insulated from the space between by the partition 29. At diametrically opposite positions, inlet ports 3l are formed in the valve opening from the spaces 32 at the outer sides of the walls 28, and spaced longitudinally of the valve for alternate registry with the respective ports of the casing` 15. Similar exhaust ports 33 are formed in the yvalve at opposite sides of the space 34 between the walls 28, also arranged to register with respective ports in the valve casing.'A The ports 31 are spaced with their advanced sides on radii of the lvalve approximately ninety degrees from the radii of the corresponding sides of the ports 33 at the same ends of the valve, the exhaust portsbeing in advance of the inlet ports in the direction of rotation of the valve. This relation may be slightly varied in accordance with the well known principles of timing valve actions in such enl gines.

The retainer fitting 23 is formed with a Vcentral duct portion 24 centrally thereof having an inner part 25 engaging snugly through the opening in the gear portion of the valve, a shoulder 34 being formed on the valve against which this duct engages, by which the valve is held against longitudinal movement. The outer part of the duct is formed in any Well known manner for engagement with a gas supply pipe. Intermed'iately of the duct a frusto-conical base is formed, bolted to the iange 22 of the valve casing, and serving. to inelose the gear portion of the valve as well as to retain the valve in place and Iform an inlet connection. The outer part of the duct may be abruptly turned as at 36 in order to facilitate making connections with a carbureter or the like. The base 35 l.has an opening 37 at its lower part lthrough which projects a portion of a beveled gear 38, carried on a vertical shaft, 39, whichvis preferably mounted on the forward side of the cylinder in such a way as to permit the valve casing to be removed without dismounting the gear 38 or its shaft.

The lports of the valve may be of a width to include a radius of forty five degrees, and the erts of the casing may be of a like widt 1. The length of the ports of the valve and casing may be the same as the length of the ports in the .cylinder head. 1t is thought desirable, however, that the exhaust ports be a little greater in radius, in order that an early exhaust may be attained provision for this being indicated at 40 in Fig. l.

The passage of the charges through the gear portion of the valve will prevent this part from becoming over-heated, so that it will retain its temper and hardness, obviating liability of frequent renewal. The form of construction provided enables the prediletion of the mechanism in anvextremely compact form, the simplicity of the driving connect-ions being obvious.

The connections with theshaft 39 for operating the gear 38 may be of any familiar type, preferable by beveled two-to-one gears on the crankshaft of the engine and on the lower end of the shaft 39, wherebythe valve will make one turn to two revolutions of the crank shaft. The valve is timed so as to close Vthe exhaust over a given cylinder just as the piston therein reaches the outer limit of the scavenging stroke. The cutoff portion 41 between the mutually adjacent exhaust and inlet ports is of a width to permit opening of the inlet port of the valve immediately after closing of the exhaust. That is to say the distance between the two ports is just about the same as the width of the port in the casing. The operation of valves with the same principle being familiar, it is believed unnecessary to describe in detail the cyclic action of the engine, it being suii'icientl remaining closed during thecompression and working strokes.

That is claimed:

1. A rotary valve member for the use described comprising a cylindrical outer wall, parallel longitudinal planiform walls joined to opposite sides thereof forming a middle passage and two passages without the parallel walls within said cylindrical wall, two opposite ports being formed through t-he cylindrical wall between said parallel walls, opposed ports being formed in theV cylindrical Wall without said parallel-walls, said lastnamed walls stopping short of one end of the cylindrical wall, a closing end piece between the parallel walls at said end, and closing walls between the said parallel walls and the cylindrical wall at the opposite end of the valve.

2. In an engine ofthe character described, a plurality of parallel cylinders, a crank shaft, pistons reciprocable in the cylinders and operatively connected to the shaft, said cylinders having a head, a valve casing on the head having a passage therethrough circular in cross section and disposed transversely of the cylinders immediately adjacent their axes, a longitudinal port being of said passage, inlet and exhaust ports being formed in the wall in the same plane of rotation for successive alinement with the irst named ports, the exhaust ports being diametrically spaced, and the inlet ports being spaced 90 degrees more or less therefrom, parallel longitudinal walls being formed in the valve approximately alined with respective sides of said exhaust ports, the space therebetween being closed at one end and open at the other, longitudinal spaces being left outside said parallel walls within said outer wall, said last named spaces being closed at the end adjacent the open end of the space between the parallel walls and 15 open at their other ends, two-to-one operative connections between the shaft and the valve, and separate duct connections at each y end of th;J valve.

In'testimony whereof have aflixed my 2o signature in presence of two witnesses.

JACOB C. HOFF.

lVitnesses:

KATHARINE JACOBS, BENSON R. VEASEY.