US1074121A - Valve mechanism for explosive-engine. - Google Patents

Description

W. D. KELLY. VALVE MECHANISM FOR EXPLOSIVE ENGINES.

APPLICATION FILED SEPT, 19, 1912.

Patented Sept. 30, 1913.

WITNESSES I monmavs "WILLIAM D. KELLY, 0E BEECHWOOIQ PARK, PENN$YLVANIA.

VALVE MECHANISM FOR EXILOfiVE ENGINES.

Specification of Letters Patent.

Patented Sept. 30*, 1913.

Application filed September 1;), 1912. Serial No. 721,123.

To all whom it may concern:

Be it known that I, WILLIAM D. KELLY, a citizen of the United States, residing at BeechwoodPar-k, county of Delaware, State of Pennsylvania, have invented a new and useful Valve Mechanism for ExplosiveEnr gines, of which the following is a specification.

This invention relates to puppet valves ffl' explosive engines, and more particularly to mechanically'operated inlet and exhaust vala s, and has for an object to provide a means for positively and accurately opening and closing a valve at the proper time in thescycle' of operations and eliminating the use of a spring for effecting movement in one direction of the valve.

In gas engine valves as heretofore devised, a spring or springs have been necessary as an adjunct to close the valveafter the same has been opened-either by 'suctiO-n or. by mechanical means, and in practice it has been found at high speeds the action of the i spr ng or springs has not been satisfactory 5 cut preferredby me, since the same andthere is a lag or floating which seriously affects the efliciency of thQlJlOlZOI. This lag is apparenteven in new springs and grad ually increases and becomes more and more aserious factor as the springs weaken throu h use or the temper of the spring va ries t rough its exposure to the high ternperature of the exhaust. Where the spring has become too weak to seat the valve quickly and in its proper relation to the cycle, a part of the charge drawn into the cylinder is forced out again and is frequently the cause of back firing, and this latter defect is equally true through failure of the exhaust, valve to seat- By my present invention I have overcome the foregoing defects and provided a structure wherein the valve, in either of its movements, is mechanically operated there.- by making its operation positive and effective for the purpose intended, and by means pf which gumming of the valve stemor spindie will have no efiect on its proper actuation.

Itfurther consists of other novel features of construction, all as will be hereinafter fully set forth.

For the purpose of illustrating my inven tion, I have fliown in the accompanying drawings one form thereof which is at preshas been found in and guide a moving of-gas or exhaust of w practice to give satisfactory and reliable results, although it is to be understood that the various instrumeutalities of which my invention consists can be variously arranged and organized and that my invention is not limited to the precise arrangement and organization of these instrumentalities as herein shown and described.

Referring to the drawings :Figure 1 represents a-vertical section of a valve op erating mechanism, embodying my invention. Fig. 2 represents a side elevation partly insection of a portion of the mechanism shown in Fig. 1. Fig. 3 represents a section on line a2-a7, Fig. 1. Fig. 4 represents a plan of the cam controlling the opening of the valve. Fig. 5 represents a. s1de elevation of one of the cams for con.

trolling the closing movement of the valve.

Similar numerals of reference indicate corresponding parts in the figures.

-1 designates a cap adapted to be fixedly secured to the crank case or other suitable part of an engine casing, and the same is preferably provided wit a rectangular or other polygonal shaped opening 2 to receive part of the mechanism, and prevent relative rotation of the parts.

3 designates the valve proper and the same is here shown as seated in the opening 4, of the valve chest which controls the admission aste products from the engine The valve 3 is fixedly carried by the stem 5, which, in the present instance, is provided with a threaded portion 6, upon which an. internally threaded sleeve 7 is can ried. This sleeve serves to adjustably secure the valve stem 5 to the operating spindle 8,

which it will be noted is oppositely threaded.

with respect to the valve stem 5, as shown at 9, thereby permitting suitable adjustment of the valve by varying the length of its oporating adjuncts, Suit-able lock nuts 10 are pro vided at each end of the sleeve? to maintain the desired adjustment. The operating spindle 8 passes through and interior-1y of a guide member 11 located in the opening 2 and having an extension 12 projecting through an opening in the top of the cap 1, and it will be noted that the said cap is provided with an exterior boss 13 whichforms a suitable bearing for the reciprocation of the hollow guide extension 12. The member 11, in the present instance, is threaded into a head 14, and forms a part thereof, as shown at 15, and the head 14. is connected to a suitable operating mechanism for reciprocation within the cap 1. The head 14 is bored out to a depth greater than the thickness of the member 11, in order to form a chamber 16 within which is located a coiled spring 17, having a hearing at one end against the guide member 11, which has seats 18 for the purpose, and at the other end against a collar or abutment 19, either integral with or fixedly secured to the spindle 8. The head 14 is also drilled to form a uide passage 20 in alincment with the spintle 8 and within which the end 21 of the said'spindle is located and serves to maintain the parts in operative position.

22 designates the timing shaft, of an explosive engine, suitably mounted for rotation and connected to its operating parts (not shown) and carries a cam 23. the center of which is preferably alined with the axis of the spindle 8. This cam 23 is provided with an actuating surface 24 ."and a face 25 which does not engage or cohtactwith the part actuated by the cam or other parts.

26 designates a cam roller suitably mounted on ball or roller bearings 27 carried by a cup 28, fixed in any suitable manner to a pin 29, the latter being connected at each end to a bifurcated or slotted member 30, carried by the head 14 through the medium of threaded studs 31 and nuts 32. These members 30 as will be apparent are slotted in' order to straddle the shaft 22 and provide for proper operation of the parts. It will thus be seen as the shaft 22 rotates the cam 23, at certain times, will contact with the roller 26 and move the members 30 in one direction, thereby shifting the head 14 with its attached parts. The head 14, in the present instance is moved in the opposite direct-ion, by means of a pair of earns 33, also carried by the shaft 22, and disposed on oppositesides of the cam 23, each being adapted to contact with a face 34, preferably curved, forming a part of the head 14, and it will thus be obvious'as the shaft 22 revolves that the cams 33 will intermittently engage the faces 34 and raise the head 14. This action is transmitted through the spindle 8 to the valve 3,

- the function of which is to permit the spring 17 to come into play, after the valve 3 has been closed and the cam 23 has moved to inoperative position, in order to exert the proper pressure to maintain the valve closed or seated until the required time for opening the same again. It will also be noted that I prefer to provide a plurality of graduations 36, on the spindle 8, adjacent the point where it projects from the guide extension 12 so that a definite or predetermined adjustment of the valve 3 is made possible. I

In the operation of the valve mechanism, the timing shaft 22 is of course revolving thus rotating the cams 23 and 33 to alternately shiftthe valve controlling mechanism. The cams 33 engage the surfaces 34, and shift the head 14 upwardly within the guide cap 1 which causes the collar 19 to be picked up thus transmitting movement to the valve stem 5 and opening the valve 3, while the spring 17 remains in normal position owing to the fact that it' also moves with the head 14. As soon as the earns 33 have passed out of engagement with the surfaces 34, the cam 23 rotates into engagement with the ball-bearing cam roller 26 to cause the head to return, this movement being transmitted to the valve which is of course closed, and it will be noted that the design of the cam 23 is such that as soon as the valve-3 closed the surface 25 comes into juxtaposed relation with the roller 26 but does not contact therewith, so that at this instant the sprin 17 comes into play and yieldinglyholds th It will further be noted that I preferably provide'a clearance space between the cams and the head, as shown at 37, in. order that either set of cams may operate freely and independently thus reducing friction and chance of interference.

It will now be apparent that I have devised an operating mechanism for a gas engine valve, which is simple in construction, efficient in operation and positively controls the movement of the valve in either direction of its movement. The advantage of this construction will be readily apparent to those skilled in the art, since thereby the valve accurately e valve 3 to its seat.

regulates the admission and exhaust of gases,

while the engine is running athigh speed, and there is therefore no lag or floating of the valve due to springs controlling them and the opening and closing movements positively take place at the proper time in.

the cycle. A further distinct advantage resides in the fact that there areno springs located in the vicinity of the hot gases, and therefore this cause of defective valve operation is eliminated.

It will now be apparent that I have (is vised a novel and useful construction of a valve mechanism for explosive 611511188,-

which embodies the features of advantage enumerated as desirable in the statementof the invention andthe above description, and

while I have.,in the present instance, shown and described a preferred embodiment thereof which has been found in practice to give satisfactory. and reliable results, it is to be understood that the same is susceptible of modification in various particulars without departing from the spirit or scope of the invention or sacrificing any of its advantages. Having thus described my invention, what I claim as new and desire to' secure by Let ters Patent, is

1. In a device of the character stated, a

valve, a timing shaft rotatably mounted in operative relation thereto, a head, means to guide said head, a spindle connected to said valve and freely movable Within said'head, a plurality of cams fixedly carried by said shaft, means carried by said head and alternately actuated by said cams for moving said head t0 shift said spindle to open and close said valve, and means coacting with said spindle for maintaining said valve seated after a closing action.

2. In a device of the character stated, a valve, a spindle connected to said valve, a head torminga guide forsaid spindle, an abutment'carried by saidspindle and normally out of contact with said head and in the path of movement thereof, a casing forming a guide for said head, a guide member carried by. said head, yielding means between said guide member and said abutment, and means to respectively cause said headto move in opposite directions at a predetermined time, to open and close said valve.

3. In a device of the character stated, a valve, a timin shaft rotatably mounted in operative relatlon thereto, a head, means to guide said head, a spindle connected to said valve and freely movable in said head, means actuated by the movement of said shaft for alternately opening and closing said valve and means independent thereof and coacting with said spindle to maintain said valve seated after a closing movement.

WILLIAM D. KELLY.

Witnesses:

ROBERT M. BARR, C. D. MOVAY.

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