US1084514A - Valve mechanism for internal-combustion engines. - Google Patents

Description

J. W. WHITLOGK. I VALVE MECHANISM FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED SBPTJTS, 1912. 1 Q84 5 1 4 Patented Jan. 13, 1914.

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, J. W. 'WHITLOGK.

VALVE MECHANISM FOR INTERNAL COMBUSTION ENGINES. I APPLICATION FILED SEPT.25, 1912.

Patented Jan. 13, 1914.

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UNITED STATES PATENT oFFIoE.

JOHN W. WHITLOCK, OE RISING SUN, INDIANA;

VALVE MECHANISM FOR INTERNAL-COMBUSTION ENGINES.

To all'whom z'tmay concern Be-it known that I, JOHN W. YV ITLOOK, citizen of theUnited States residing at Rising Sun, in=the county of Oh I ful Improvements in Valve Mechanism for Internal-CombustionEngines, of which the following is a 'specificatiom This invention relates to valve operating mechanisms for internal combustion engines. Theprimajry object of the invention is to i provide 'means for positivelyopening and closing the valve of an engine of this charactor in proper timed relation with the movements-of the piston.

IA further object of the invention is to provide anj operating mechanism in which e lost motion "occasioned by wear or by improper adjustment Will be taken up'by resilient means and in which rattling of the parts is avoidedwhich occurs when springs are used to actuate the valves. I

the accompanying drawings forming a part of this specification: Figure 1 1s a vertical section; Fig. 2a vertical section showing a slightly modified form of frame constrvction; Fig. 3 an edge. elevation'of the cams and the'mech'anism to which the same are active removed from the crank case; Fig. 4 a detail view of'the arm WhlCh actuates the valve of the engineyFig. 5 a disemployed which will rotate the cam shaft in proper timed relation with the movement of the piston."

In the drawings designates the cylinder of an internal combustion engine,.the cylinder being provided with a port 11 which is closed by the valve 12. The stem 13 ofthe valve 12 is supported by the head 14 for. reciprocatory movement and its threaded terminal15 receives the sleeve 16 of the yoke 17. This yoke is Provided with the transversely disposed spaced bars-r18 and 19. A

bracket 20 is secured to the head 14,;said

.bracket pivotally supporting the arm 21cm terminal of which extends between the pins Specification of Letters Patent. Application filed September as, 1912. serial m.'722,a39.

I 18 and-I9 of the yoke 16. Thus i0. and State of Indiana, have'invented certain new and use-.

it will be noted that when movement-is imparted to Patented J an; 13, 1914.

the arm, the same. will cause the valve stem 13 to reciprocatejf the' valve either opening or closlng conslstent with-the direction. in

which the rocker arm 21 is moved. In order to compensate for over-travel of the rocker arm, and to .prevent rattling-of the valve operating mechanism, the upper'and lower faces of the rocker arm adjacent its free terminal are concaved and provided with flat springs, the fiat spring 22 of the lower face being'active to the transverse pin 18, and the spring 23 of the upper face' being active to the transverse pin 19. The springs will thus compensate for movement of the rocker arm between the transverse pins 18 and 19, and exert pressure on the valve after seatin In the form shown in Fig. 1 of the drawings the sleeve 32 is supported by the frame 33, said frame being disposed for vertical movement within the crank case,- the, body portion 44 of the frame being held from turning by the rib 45 or other suitable means which is formed integral with the wall 46 Y of the crank case, said rib being disposed be,

tween the plates 47 and 48 which constitute the frame, the lower terminal 49 of the frame extending through an opening :50

in the crank case to properly. direct the frame in its vertical movement. shaft 39 is disposed between the curved extensions 51 of" the members 47 and 48, the cams,-which are similar in construction to The cam--"= those shown in Fig. 1 of the drawing, being active to the rollers 52 and 53, the trunnions 54 of which are supported by the members 47 and 48, the rollers being disposed in spaced relation and at a point adjacent the curved portions of the plates. The roller 52, which is acted upon by one of'the cams,

consists of a single disk, the cams disposed on either side of the central cam 40 riding clear of said disk, said cams contacting with the spaced disks 55 which constitute l the roller "53. In this manner, it will be noted that as the cam shaft is rotated the cams will alternately impart movement to the frame 43 which will cause the rod 27 to actuate the valve operating rocker arm. In this form the rod 27 is adjusted within the sleeves 28 and 32 in order to regulate its stroke. The crank case 24 is provided with "its an opening 25 in which is positioned a bears ing 26 in the form shown in Fig. 1, said:

bearing receiving the rod 27, the upper terminal 28 of which is received by the sleeve 29, said sleeve being pivotally connected with the end of the rocker arm remote from the yoke of the valve, the sleeve being internally threaded to receive the threaded portion 30 of the rod 27, the rod in this manner being adjustable with the sleeve. In the form shown in Fig. 1, the lower terminal of the rod extends through the bearing 26 the bore of which is enlarged at its base, the larger bore 31/receiving the sleeve 32 which is interiorly threaded to receive the threaded terminal 31' of the rod.

In the construction shown in Figs. 2 and 6 of the drawings, the lower terminal of the rod extends within the crank case 24 through i the opening 25 and is pivotally connected with the long arm 33 of the bell crank 34. This bell crank or frame consists ofthe long spaced arms 33 and the short spaced arms 35, the frame being pivotally supported at 36 within the portion 37 of the crank case, the member 37 being bolted, or otherwise secured, to said crank case. In this form the rod 27 is provided intermediate its ends with a turn buckle by'means of which the same may be adjusted, thus regulating the stroke of the rod. A roller 38 is rotatably supported between the long arms 33 of the bell crank 34:, the terminals of thearms 35 supporting a similar roller' 35', both rollers being disposed in the path of movement of cams arranged on the shaft 39. These cams are formed integral, the cam surfaces 40 being active to the roller 35 which is supported between the terminals of the short arms 35. Therollers 35" and 38 consist, of disks 41', the roller 38 being provided with one disk which contacts with the central cam, the other roller consisting of spaced disks which contact with the cams arranged on either side of the central cam, the roller riding over the cam which is active to the same, the cam at intervals imparting movement to the roller to swing the bell crank 34 on its pivot. When the cam surfaces 40 assume a position to act upon the roller 35 the bell crank will be moved on its pivot to pull the rod 27 downward, which movement will cause the terminal of the arm 21 which extends within the yoke of the valve stem the mechanism when the valve is operated.

Attention is called to the peculiar construction of the cam and the manner in which the same operates the valve actuating mechanism, it being noted that the inner central rollerhfts the valve as'the same to thesmall diameter, thus closing the valve,

it being noted that the divided roller follows the central roller without back lash. The double cams are positioned on either side of the central cam to keep the pressure between the cams and rollerscentral with respect to the frame which supports the rollers. It will be noted that-this construction provides a, valve operating mechanism without the use of springs, there being means provided for preventing rattling of the mechanism and for taking up lost motion, said means causing the operating rod to eiiert pressure on the valve after the same has been seated.

The many advantages of a valve operating mechanism of this character will be clearly apparent, as it will be noted that the same provides means for efi'ectually opening and closing the valve of the engine, means beingprovided for compensating for improper adjustment of the working parts or for any inaccuracy of the stroke of the operating rod due to expansion or contraction. It will also be noted that the construction is such as may be easily and economically manufactured and that the variou parts may Toe-readily assembled.

Having described the invention, what/I claim is: 1. A-valve operating mechanism for internal combustion engines comprising an arm pivot-ally supported by the cylinder adjacent the engine valve, said valve being provided with a stem which extends beyond the engine casing, a sleeve threaded on said stem, a yoke supported by said sleeve, said- .yoke including transversely disposed spaced pins, said arm extending between said pins, resilient means positioned on the arm and disposed for contact with said transverse pins, and cam meansfor imparting move- -ment to said arm.

2. A valve operating mechanism for internal combustion engines comprising an arm pivotally supported adjacent the valve of the engine, said valve being provided with a stem the terminal of which is threaded, a yoke receiving said stem, said yoke including transversely disposed members, said arm extending between said members, said arm being concaved on its upper and lower faces adjacent one of its terminals, a fiat spring secured to each of the faces of said arms, and cam means for imparting movement to said arm to actuate .said valve stem.

3. A valve operating mechanism for gas engines comprising an arm pivotally supported adjacent the valve of the engine, a connection between said arm and the stem of said valve whereby when said arm is moved on its pivot movement will be imparted to said valve, a rod pivotally con-- nected to the terminal of said arm remote from said valve, said rod being supportedspaced arms, said rod being pivotally sup ported between the terminals of onepair of arms, a roller supported by each" pair of.

arms, and cam means for actuating-said rollers to rock said bell crank.

4:. A valve operating mechanism for in ternal combustion engines comprising an arm pivotally supported by the engine casing, a valve supported for reciprocatory movement by the casing, the stem of said valve projecting beyond. the casing, a yoke supported by said stem, said yoke including transversely disposed spaced members, one terminal of said arm extending between said spaced members, the upper and lower faces of the terminal of said arm being concaved, springs secured to said upper and lower faces and disposed to extend across the conca'ved portions of the same, and means for imparting movement to said arm to reciprocate said valve stem.

5. A. valve operating mechanism for gas engines comprising an arm pivotally supported adjacent the valve of the engine, a connection between said arm and the stem of said valve whereby movement of the arm will impart movement to the stem of the valve, a rod pivotally connected to the terminal of the arm remote from said valve, said rod being supported for reciprocatory movement by the crank case of the engine, a frame including spaced members connected to' the terminal of the said rod and arranged within the crank case, rollers stipported in spaced relation by said frame, the portion of the frame intermediate the rollers being curved, a guide supported by the crank case and disposed to extend between the members which constitute the frame, a cam shaft disposed between the rollers which are supported by the frame, and earns mounted on said shaft, said cams alternately engaging said rollers.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN w. WHITLOOK. L.' 5.

Witnesses HORACE SHAW, JAMES P. MILLS.

' Qopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. 0.

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