US1061868A - Valve-gear. - Google Patents

Description

0. B. REDR'UP.

VALVE GEAR. PPPPP GATION FILED AUG 101911 1,061,868, Patented May 13,1913.

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Speoificalion of Letters Patent.

Application filed August 10, 1911. Serial No. 843,455;

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Be it known iha' 1, CHARLES BENJAHK'N liicomir, a subject of the King of l lnfgla'ilfl, residing at Canton, Cardill", in the county of Glamorgan, sl ales England, have invenlecl certain new and useful Improve inenls in ValveGear, of which the lollmw ing is a specificalion.

This invenlion is for improvements in or relating lo valve gear for inlernal coinlimstion engines of the rotating cylinder type and has for its object to provide a simple form of gear dial will hold the valves always under control anal not move them chiring the compression or firing strokes and will then quickly move them into full open.- ing position. Thus during the compression and firing slrokes the valves, Which are preferably of the semi-sleeve type can remain stationary but as soon as the exhaust or inlet SiPOliS are commenced the valves can be rapidly openeel to the full exlent.

According to this invenlion lhc valve mechanism for each valve comprises a rocking frame controlled by a clouhle cai'n whereof the portions at greatest distance froin'the center of the camshaft-are both on the same side of the shaft and cooperate with staggered portions of '{he frame, or parts carried thereby, that, lie on opposite sides of the cam-shaft. By making half or more of such a cam concentric with the axis of its shaft The long clivell desired and then the rapid movement of the rocking frame required for opening the valves, can he obtained.

According to one method oi carrying out this invention as applied to an engine having three cylinders radially disposed aromnl and projecting partly into the crank-case.

the rocking frames and their (louhlo rams are provided in pairs and disposed one pair.

between each live cylinders. The two pairs of cams are carried on a shaft common to both and each shaft has on it a toothed wheel. These wheels mesh with other wheels arranged around the crank-shaft oi the engine and meshing in turn with a wheel thereon. All this mechanism is inclosecl Within the. crank-chamber and the rocking frame of one pair of double cams is connected to a valve belonging to one cylinder and the rocking frame lJGlUn QlHQ lo the other pair of cams on the same canishall. is operatively connected lo the valve of the cylinder on lhe other side oi the gear.

, valves are employeil, i vo ouch valves for and exhansi respec nisms; Fig. l is a section of the same on the line -l;-4.- of Fig. 25; Fig. 5 is an elevation of lhe cam-shaft shown in Fig. i): l ig'. i3 is a, section on "the line 6 5 of Fig. 5; Fig. 7 is a 'pcrspecl ive view of a valve suitable for operation by this gear; 8 is a perspecl'ivc vieivof a modified. form of valve suilable for operalion by l is near, anal Fig". 9 is a perspective view of let another form of valve suitable for operalion by this gear.

Like letters inch ale like parts throlighout the ch'awin n s. The engine has a cranlccase A. r.. hating from which are three cylinders B. iv'ilhin the Walls of the cylinch are niouimed hali sleeve valves C and X, control the ii l3 IESlllQCi-lfin] near The head en l of each cylinder. The valves are free to slide iowarcl the head end and back iOVVfll'll the cranlochamber end. iii-st in cover and then to uncov r the ports. Conduits are provided that communicate with lhe poi-ls onlsiile "lhe cylinder, but asthese form no part of the present invention they do not need to he .l znrihcclj Foch valve (l and I; has a he; 1 that projects l'hrough an opening in (he outer portion of the cylii'u'ler Wall and these lugs are connected by links 0 lorockinn' frames l). D to (he Wall of the crankwhamber and its opposite encl is connected to the link C by a pin 1). (in each fulcrunicd frame are rollers l), l). llhese rollers are placed on opposite sides 01:, a central space D proldell in (he frame and they are slaggcrml relatively l'o each olher one beingon one face of the frame and the other on the oppw site lace.

l lxlencling' lhroi the space D in lhc lramc is a cam-sham l) \vhcl'con lllllllllll can E 1* are mounted. 'lhe gun-lions r a Q .llach frame is fulcruincll at the cams that are farthest from the center of the cam-shaft are both on the same side of the shaft and are placed centrally in relation to each other, moreover, the part c of the cam E and a part c of the cam E extend more. than halfway around the camshaftand are concentric therewith. The

cain'E cooperates with the roller D and the cam E cooperates with the roller D Itwill be observed that. one cam is wide and the other narrow and therelat-ive proportions are such that as the double cams rotate both rollers are kept constantly in contact or approximately in contact with their respective cams throughout the whole rotation of the cam-shaft.

Only one pair of cams E E hasthus far 4 been described, but the camshaft vE carries a second palrjE' E that cooperate with rollers ona rocking frameD These cams and their frame are exact duplicates of those already described but they are set at an angle of 180 to the other cams so that when one pair of cams is moving its frame to the right the other pair will be moving its frame to the left. Each cam shaft has mounted on it a toothed wheel I which gears with one of a series of toothed wheels-G that are mounted around the crank-shaft A of the engine and mesh witha toothed wheel A thereon.

Each pair of double cams with theirioclo ing frames are mounted on a base-plate H providing bearings H for the cam-shaft and these plates are secured by bolts and nuts H to the crank-case between each two cylinders. One rocking frame thus serves one valve for one cylinder and the other rocking frame one valve for the adjacent cylinder. This arrangement enables the parts to be got conveniently into the cranlochamber.

The operation of the gear is as follows The crankcase and shaft may both rotate in opposite directions and therelative motion causes the intermediate gear-wheels G to be rotated about their supporting pins which communicates motion to the camshafts E. The two pairs of cams on each shaft will thus be carried around with the shaft and one-pair being set, as already explained, at 180 to the other, will cause the rocking'frames D and D to rock in opposite phase thereby imparting movement to their respective valves. The long concentric portions of the cams pass tions a of the cams allow the valves to be stationary(luring the compression and firing strokes which is an important feature, as these valves-being of the half-sleeve type they are under pressure during these periods so that any movement would result in considerable friction. as soon, however, as the valves are to be opened. these concentric poriwm their respective rollers and the roclnog frames are almost instantly brought over to the limit of their movement for opening the valves, thus throwing them wide open at the commencement of the exhaust or inlet strokes.

Instead of the valves G and X being mud in the form of a half-sleeve as shown in Figs. 2 and 7 they may be T-shaped as shown in Fig. 8, or L-shaped, as shown in Fig. 9, as only the upper portion of the valve is actually used to cover and uncover the orts.

What I claim as my invention and desire to secure by Letters Patent is-:

1. The combination with an internal combustion engine cylinder having inlet and exhaust ports,of controlling valves for said ports; and means foractuatingeach of said valves comprising a fulorumed ring having oppositely disposed rollers journaled thereon, a link connecting said ring with the valve; and a cam mounted to rotate within said ring and adapted to engage with said rollers and move the ring to actuate thevalve, substantially-ms described.

2. The combination .with an internal combustion en ine having a casing, and cylinders provided with inlet and exhaust ports, of controlling valves for said ports, and means for moving said valves axially of the cylinders to open and close said ports, saidmeans comprising annular frames fulcruined in pairs on the casing between said cylinders, a ."link connecting each of said frames to one of said valves, shafts journaled in the casing and passing through said annular frames, and cams on said shafts located within the annular spaces of said frames and adapted to engage with the frames to move the same for actuating said valves, substantially as described.

3; In valve gear-foi internal combustion engines oftherotating cylinder type wherein the cylinders are arranged radially around thecrank-case the combination of, a fulcrumed frame having an openin in it, a cam-shaft that extendsthrough t e 0 ening in the frame, and two cams on the s aft one on each side of the frame the portions of the cams that are at greatest distances from the center of the cam-shaft being both on the same sideof the shaft and the frame being provided with opposed projections one on one'side and the other on the other side of the frame for cooperation with the cams which projections are so situated and which cams are so shaped that continuous control of the frame by the cams is main- 1 tained, substantially as and for the purpose set forth.

4. In valve gear for internal combustion engines of the rotating cylinder type whereinthe cylinders are arranged radially around 1 the crank-case the combination of, a fulcrumed frame having an opening in it, a cam-shaft that extends through the opening in the frame, and two cams on the shaft one on each side of the frame such cams hav- 1 half of one cam being on the opposite side.

of the shaft to the corresponding half, and having the remaining portion of each shaped to give a quick full displacement to the fulcrumed frame and the frame being provided with opposed projections one on one side and the other on the other side for cooperation With the cams which projections are so situated and which cams are so shaped that continuous control, of the frame by the cams is maintained, substantially as and for the purpose set forth.

5. In valve gear for internal combustion engines-of the rotating cylinder type wherein the bylinders are arranged radially around .the crank-case the combination of, two rock.-

ing frames spaced apart and pivoted about an axis common to both each frame having an opening in it, a cam-shaft that extends through the openings in the two rock- I ing frames parallel to the axis about which theyrock, four cams on the shaft one. on each side of each frame, the cams allotted to one frame having the portions that are at greatest distances from the center of the crankshaft both on the same side of the shaft and those allotted to the other frame having such portions both on the opposite side of the shaft, each ,cam-ha-vin approximately half of itsoperative face "concentric. with the axis of the-shaft such half of one cam' being on the opposite side of the shaft to the corresponding half of its fellow cam, the remainingportion of-each cam being shaped moreover togive a quick full displacement .to itsrockin frame, each frame moreover being =provi edwith oppos-ed pro ections one .on one side and the other on the other side for cooperation with the cams allotted to it which projections are so situated and which cams are so shaped thatcontinuous control of each frame by its cams is main: tained, means for operatively connecting one rocking'frame to a valve of onecylinder of the engine, and means for operatively connecting the other frame to a valve of another cylinder of the engine, substantially as and for the purpose set forth.

6, In valve gear for internal combustion engines of the rotating cylinder type wherein the cylinders are arranged radially around the crank-case the combination of, two rocking frames spaced apart and pivoted about an axis common toboth and situated Within the crank-case at a point that is circumferentially midway-between two cylin ders each frame having an opening in it, a cam-shaft that extends through the openings in the two rocking frames parallel to the axis about which they rock, four cams on the shaft one on each sidq of each frame, the cams allotted to one frame having the portions that are at greatest distances from the center of the crank-shaft both on the same side of the shaft and those allotted to the other frame having such portions both on the opposite side of the shaft, each cam having approximately half of its operative face concentric with the axis of the shaft such half of one cam being on the opposite side-of the shaft to the corresponding of its fellow cam, the remaining portion of half each cam being shaped moreover to. give a means-for operatively connecting one rocking frame with a valve of that cylinder of the engine that is on one side of it, and

means for operatively connecting thejother rocking frame with a valve of that cylinder of the engine that is on the opposite side of it, substantially .as and for the purpose set forth. y

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

CHARLES BENJAMIN armor.

\Vitnesses:

HUGH M. INGLEDEW, GWILYM JoNns

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