US1692396A - tipton - Google Patents

Description

Nov. 20, 1928.

W. D. TIPTON 1 ROTARY VALVE Filed Dec. 11, 1926 3 Sheets-Sheet .7 v e? ,l

Nov. 20, 1928.

w. D. TIPTON ROTARY VALVE Filed Deo. l, 1926 3 Sheets-Sheet 2 s Nf/ Nov. 20, 1928'.

W. D.. TEPTON ROTARY VALVE Filed Dec. 11, 1926 3 Sheets-sheet 3 l l l Patented Nov. 20, 19248.

UNITED STATES WILLIAM ID. TIPTON, OF TOWSON, MARYLAND.

ROTARY VALVE.

Application filed December 11, 1926.

The invention forming the subject matter of this application relates to an improved construction in rotary valves for internal combustion engines.

The object of this invention is to provide valves of this type constructed with the least number of parts which are easily assembled and provide means for automatically adjusting the valves to compensate for wear and prevent leakage.

Other objects of the invention will become apparent as the detailed description proceeds.

In the drawings Fig. 1 is an elevation of a two-cycle rotaryvalved internal combustion engine, with parts thereof broken away to disclose the valve mechanism clearly;

Fig. 2 is a transverse vertical section taken on the line 2 2 of Fig. 1;

Fig. 3 is a central vertical section to an enlarged scale of a diaphragm construction forming the essential parts of the rotary valve disclosed herein;

Fig. 4 is a central vertical section through a cylinder and cooperating rotary valve of a four-cycle internal combustion engine equipped with this invention;

Fig. 5 is a perspective view of the valve used in the type of engine shown in Fig. 4;

Fig. 6 is a perspective view of one-halt1 0i' one of the valve elements;

Figure 6a is a fragmentary detail of the valve structure shown in Figures 4, 5, and 6.

Fig. 7 is a central transverse section of a modilied form o'li' the invention;

' Fig. 8 is a central vertical section through a modiiied form of the two-cycle valve;

Fig. 9 is a central vertical section through the diaphragm supporting arms of another modification oi' the two-cycle valve;

Fig. 10 is a central vertical section through a modification of the tour-cycle valve; and

Fig. 11 another modification of the fourcycle valve.

As the invention disclosed herein resides primarily in the rotary valve construction, the details of the engine are not illustrated nor described herein. In Fig. 1 of the draw Serial No. 154,219.

ing the engine block 1, shown as provided with four cylinders 2; is bored lengthwise to form a cylindrical valve chamber 3 in which the valves 4 are mounted to rotate. The valves 4 are properly spaced angularly relative to each other and are interloclred as by tongue and groove connections to be rotated together by any suitable means connected operatively to the gear 6.

Each valve comprises a semi-cylindrical section 7 having diametrically opposed rectangular' recesses 8 and 9 formed in its straight edges 10 and 11, to coincide with similar recesses 12 and 13 formed in the straight edges 14 and 15 of the other section 16. rlhe two sections 7 and 16 when joined together, as shown in Fig. 2, fit snugly and rotatably in the chamber 3 and are connected yieldingly to each other by the diaphragm structure shown in Figs. 1, 2 and 3.

The section 7 has an aperture 17 formed in the center of its cylindricalV surface and an arm 18 has a shouldered end 19 screwthreaded into said aperture 17 or is otherwise iXed to extend radially toward the axis of the cylindrical valve 4 where it is spread out to iorm a plane circular seat 20 for a circular diaphragm 21.

The diaphragm 21 is punched out at its center to form an aperture 22` and is bent around this aperture to form a truste-conical seat or counter-sink 23 for the head 24 oi a screw 25. The arm 18 is Vaxially bored throughout its length and has the inner end of the bore 26 screw-threaded to receive the corresponding screw threads of the screw 25, which is also provided with a bore 27 coaxial with 'the bore 26.

rlhe diaphragm 21 is secured to the arm 18 at the center of the circular seat 20 by the screw only and is not otherwise secured to the seat 20.

An arm 28 similar in every respect to arm 18 is similarly secured to the valve section 16 by having its shouldered end 29 iixed suitably in the aperture 17 and is spread out at its inner end to form the circular seat 30 Jfor the diaphragm 31 similar in every respect to diaphragm 2() and secured to thearm 2.8 by a '35 and 36 respectively.

`fiat parts 37 and 3S securely ltothe spacer The structural details oitA this .membf it) are not described herein, since any other lita clamping means may be employed to il?4 diaphragms to the ring 39 and nime a strong' gas-tight tit therewith. z

The ports 'formed in cach valve by the rccesses SM-,lQ and Qmlfi are oit the saine area asf the cylinder `inlet ports lil, and the valve chamber 3 is provided ih ret-.estres fl-l" ol the same area as ports 1Vl.

` The engine block l provided with the usual gas inlet port 42, the exhaust ports and screw-threaded apertures adapted to receive the usual spark plugs45.

The diaphragms 2l and 3l arelied at their centers only to the arms i8 ant 28 and are termed so that they normally tend to separate said arms so as to orcethe cylindrical sections' and 16 4of the rotaryvalve into close rotary litI against the cylindrica1 Wall oi valve chamber. This condition oi. the valve is l shown in Fig. 2, Where the valve is positioned to permit the 'flow oi gas into the Vcylinder 2, at the intaliesexhaust stroke ot the piston. Y

l/Vlien the valveis rotated at ninety degrees to the position shown in Fig. 2, the exhaust ports 43 are closed and the piston is on its comessionslirino' stroke. 'lhe com )ressed Oas l. t9 Y C still further and thereby, through arms i8 and 28, 'to :torce the valve sections and 1G into still closer. Contact with the Wall ojfvcharnber 3. The recesses fil then serve to balance the pressures on opposite sides oi the valve.

It will be obvious that when the valve is positioned at the comp1 sion stroke o'l' the pister., the parts thereof will be separai'led under a torce directly proportionalvto the compression in the cylinder. v

Figs. ll, 5, and G illustrate the application of this invention Vto a 'four-cycle engine. llore the valve 4:5 is ,split lengthwise and its two halves Gand L7 are secured to each other by y diaphragme i8 and All) secured to each other and to their respective halves i6 and ii7 by a split ring a9 in substantially the same manner as that illustrated in Figs. l, 2, and 3.

ln this torni olf the invention the gas inlet 50ris alined with the outlet5l'; and in order to arcuate strap 53 ci a Width suiiicient to close said bore is suitably lixed inthe inlet and in Contact with said valve.

Another modil'ieation or" this invention Ais shown in l? T. ln this form, the valve split into halves lfand 55 and these halves are provided at their centers with cylindrical recesses 56 and 5" peetively. rthe recess 5G serves as a'sozit ior the correspondingly .s pecl projection 58 formed centrally on the 'l r 59 which extends with a sliding it ross both halves 511- and 55 in suitably boxed ont parts (not shown) in said halves.

il piston 60 having a dished head 6l lits 'slidably within said cylinder 59 and has a -on position, and there. Y

by to nforce the valve halves into gas tight con- 'tact with the Wall of the valve chamber. lt will be obvious that gas under compression entering the here Will pass between the dial ed head (l andthe adjacent llat head ot the, cylinder 59 and vvill ilorce these members apart in direct proportion to the force of gas l comp ession y Y lt Will be noted that in all forms of the invention the valves are split in halves, and means are interposed betweenthese halves to ecp them normally in spring contact with the valve chamber Wall, and, inaddition to this means, the valve mechanism is so constructed as to utilize the compression of the gasl to increase the contact pressure oi vtlievalves With the wall of the valve chamber. For etlicient operation ot' this type of valve, the eii'ective pressure area ol the diaphragins, or their equivalent shown in Fig. 7, should be aboutl 'twice the. area of the port opening into the cylinder. i

ln the modification shown in Fig. 8 the diaphragnis` 66 and (S7 have their peripheries bent over the circular seat ,flanges 2l and 30 outer edges oy means of the rings 68 and 69,'V

respectively, which may be shrunk or Welded on, or otherwise suitably secured to said flanges. l y

These diaphragms are arranged to Contact normally at their centers and to keep the valve sections l and 8 normally in close lit with the cylindrical Wall oil the valve chamber. i y y Y In the modiiication shown in Fig. 9 a sin-V gle diaphragm TOVis used to separate the twohalves et' the valve, of which the supporting arms 18 and 28 only are shown. The, diaier phragm has its center punched and countersunk to be secured at its center to the arm 28 by a screw 25 and has its periphery se cured to the outer edge oi flange 2l by a ring 68. j

T he arms 18 and 28 are provided with the bores 26 and 34 and the screw Q4 with the bore 33. The operation of this form of the invention and of that shown in Fig. 8, will be obvious from inspection of the drawing and from the description 03": the preceding forms et the invention.

In the modification shown in Fig. l0, the valve comprises a central body 7l and similar segments 72 arranged one on each side of said body 7l. Each segment similarly dished on its iiat face and has a central bore 7 3 therethrough, and a diaphragm 74 is secured in any suitable manner at its outer periphery to the flat face oi' the segment over the dished part thereof. As usual the diaphragme are slightly bowed to contact at their centers with the flat faces of body 7l, and normally tend to separate segments 72 vfrom body 7l to ensure a snug t ot the valve in its chamber.

In the modification illustrated in Fig. ll, the valve body 7 5 is axially bored to receive the cylindrical members 76 each of which is provided with axial bores 77 screwthreaded at the inner fiat end 7 8 to receive the axially bored screw 79. The bore 77 is countersunk to receive the countersunk center of the diaphragm 80 and the head of screw 79. The two diaphragme 80 are spaced apart at their peripheries and are clamped together by a ring Sl substantially in the same manner as shown in Fig. l. As will be obvious from the drawing, the diaphragms in this modification are wholly concealed in the valve body 75.

The operation of the modiiication shown in Figs. l() and ll is substantially as in the previously described form of the invention.

I claim:

l. The combination with a cylindrical valve chamber of a cylindrical valve rotatable therein, said valve being formed o'l' two similar halves, and means between said halves to torce them into yielding` contact with the wall of said chamber.

2. The combination with a cylindrical valve chamber of a cylindrical valve rotatable therein, said valve being formed of two halves similar in every respect, and spring mechanism interposed between said halves to force them into yielding rotary contact with the wall of said chamber.

8. The combination with a cylindrical valve chamber of a cylindrical valve rotatable therein, said valve being formed oit' two halves similar in every respect, a circular spring diaphragm having its center fixed to each halt' at the center thereof, and means for securing the circular edges of said diaphragms to each other, said diaphragms being shaped to eiect separation of said halves and to force them into yielding contact witl the wall of said chamber.

4. In an internal combustion engine, the combination with a cylinder a cylindrical valve chamber having a port communicating with said cylinder, a cylindrical valve rotatable in said chamber, said valve comprising two segments slightly spaced apart, yielding means interposed between said segments to force them normally into Contact with the wall of said chamber, said segments and means being provided with alined bores to permit gas from said cylinder to enter the space between said segments when said bores register with said port.

5. In combination with a cylinder, a cylindrical valve chamber having a port communicating with said cylinder, a cylindrical valve rotatable in said chamber said valve being divided into two parts, a pair of circular springdiaphragms iXed at their center to each part and having their circular edges spaced apart from and iiXed to each other, said parts and diaphragms being provided with alined bores to permit gas to enter the space between said diaphragme when the said bores communicate with said port.

6. In combination with a cylinder, a cylindrical valve chamber having a port communicating with said cylinder, a cylindrical valve rotatable in said chamber, said valve comprising two similar parts, yielding means interposed between said parts to keep them normally spaced apart and in Contact with the wall of said chamber, said parts and means being provided with alinedbores to permit gas from said cylinder to enter the space between said parts when the bores communicate with said port, said chamber having a recess of the same cross-sectional area as said port to provide for balance of gas pressure on the valve parts when said bores communicate with said port.

7. The combination with an engine cylinder having a valve seat and a port between said seat and cylinder, a valve controlling said port, said valve including two parts, and means interposed between said parts and adapted to be exposed to the internal pressure in the cylinder to move said parts to contact tightly with said seat.

8. The combination with an engine cylinder having a bore forming a valve seat, a valve fitting rotatably in said seat and com prising two parts, a pair of spaced apart diaphragms connected at their edges to each other and to said parts at their centers, said diaphragms and parts being bored to expose the adjacent faces of said diaphragms to internal pressure in cylinder to force said parts into tight contact with said seat.

9. The combination with an engine cylinder having a valve seat and a port between said seat and cylinder, a valve controlling said port, said valve including two parts,

and means including` a yspring diaphragm interposed between saidpzuzts land adapted t0 be exposed to the internal pitessure in the cylinder to move said parts fao ,Contact ,tightly with Said seat.

110. The combination with an engine ,cylinder having a bore forming a valve sea-tf, 'a valve rittng Arotatably in said seat and comprising a central body., `ai. rg'pair of simile;1 vSegments disposed -a't opposite sides 1of said body 10 and having bores `through the center thereof, and .diaphragins secured to said segment and normally engaged insaid body to force said segments-against Said Seat. ,y

In testimony whereof I afiX my signature.

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