US1520208A

US1520208A - Valve-actuating gear for internal-combustion engines

Info

Publication number: US1520208A
Application number: US586971A
Authority: US
Inventors: Pielstick Gustav
Original assignee: Individual
Current assignee: Individual
Priority date: 1922-09-08
Filing date: 1922-09-08
Publication date: 1924-12-23
Anticipated expiration: 1941-12-23

Description

Dec. 23, 1924. 1,520,208

' G. PlELSTlCK VALVE ACTUATING GEARFOR INTERNAL COMBUSTION ENGINES Filed Sept. 8,' 1922 Patented `Der. 2a. 192e.

ortica.

VALVE-ACTUATING GEAR. FOR INTEBNAL-COMBUST-[ON ENGINES.

Application mea septembef a, 1922. serial no. 586,971.

To all lwhom t may concern:

Be it known that I, GUsTAv PIEL-STICK, a citizen of the German Republic, residing at Augsburg, Germany, have invented certain 5 new and useful Improvements in Valve-Actuating Gears for Internal-CombustionEngines, of which the following is a speciication.

This invention relates to the valve actuating rocking levers of internal combustion engines and its main object is to-provide a rocking lever which will eliminate certain drawbacks existing in the present type of rocking levers and which consist in the dificulty of adjusting or timing the valves to suit varying conditions of engine running.

lt is known that hitherto the valves have s been timed by adjustment of the valve operating cam and by altering the distance of the cam roller from the cam. In stationary engines this adjustment is eected during the engine test, whereas in marine engines, which, asa rule, do not undergo such engine tests, adjustment isl carried out during the trial run' of the vessel. But even apart from such initial timing it is often necessary to alter the timing under normal working conditions when, for example, after changin the valves, or after changing from one fue to another, the working diagram of the engine has been altered so that re-timing is required. At the present time, since this adjustment of the valves must be carried onv by altering the position of the cam, it is necessary that the engine be stopped and in the case of marine engines this involves stopping the ship. Furthermore, this adjustment'by altering the position ofthe cam is accompanied by great inconvenience and'delay on account of the ditllcultyand delicacy of the work.

The present invention eliminates the disadvantages above mentioned and permits the valves to be timed under normal running conditions without interruption of the work,

and with this object in view the inventionconsists in the provision `of means to allow of an adjustment of the cam roller relative to the cam instead of altering the position of the cam itself. The rocking lever, for this purpose, is made in two parts and has two eccentricities of which each may be altered 4independently of the other. By suitably altering the eccentricity of the one or the other part, which may be done while the engine is running, the radial distance, or the tangential distance, of the roller from the cam may be independently adjusted as required, whereas a suitable adjustment of both Yeccentricities will eiect an alteration of the valve lift as regards stroke as Well as -time and duration of opening. The working diagram ma thus be conveniently corrected without t e necessity of stopping the engine. The accompanying drawing illustrates the invention by wa of example.

Fig. 1 is a si e elevation of the improved rocking lever arrangement, some minor parts being shown in section.

the working lever is made to consist o Y two parts, namely the roller arm a and the lifter A portion b, the latter terminating in a forked end in which the former is received. Both Y parts are held to one another by bolts c and d. Within the boss of the rocking lever there is looselyarranged an eccentric bushing e which lits over the valve rocker pin upon which it may be circumferentially adjusted. The said bushing is provided at its upper portion with aflange extension e1 and 1s adapted to turn to an extent limited by the slot e2 in the flange in Iwhich is received a pin or stud f mounted in the lifter a-rm b. The bushing is held in relation to the lever by means of a nut g which vis threaded on the pin f.

An eccentric disc z. is keyed or otherwise i fixed to the aforesaid connection bolt c and adapted to turn within a cavity of the roller arm a so as to adjust the vertical position of the latter. To permit this adjustment to be made the bore z' of the roller arm a is greater in diameter than the bushing e by an amount which corresponds to the amount of eccentricity of the disc h. `In addition there is a like amount of clearance between the bolt d in its bolt hole j. To facilitate setting the roller, the lifter arm b is provided at its top with a graduated scale 7c, from which the 70 l Fig. 2 is a cross section through the centre l amount of adjustment of the bushing e and the eccentric disc h may be observed.

In order, now, to alter the distance from the cam of the roller Z of the rocking lever the rigid bolt connection between the bushing e and the lifter arm b must be slackened by loosening the nut g and turning the bushing e upon its pivot to the desired extent and in the direction required, the graduated scale n affording a means by which an accurate adjustment may be secured. The eccentric shape of the said bushing will thus cause the centre point of the rocking lever boss to be shifted and, the lifter arm'end o serving as fulcrum, to cause a radial movement of the roller Z towards or away from the cam. In this way the lift of the needle valve as well as the duration of opening may be altered.

' After this adjustment has been carried out the bushin e may again be secured in position byltig tening up theV nut g. This having been done, the connection bolts c and d are slackened and the eccentric disc h, turned as far as required, whereby the roller arm a will be moved within its enclosing lifter arm in a direction tangential tothe circumference of the cam, whereby the time of valve opening will be altered correspondingly.

It will be seen that, by simply slackening a few screw connections and turning the two eccentrics e and h, the position of the roller may be altered as required and the valve gear timed so as to obtain proper working diagrams.

The invention is mainly designed for use in marine engines, in which connection it offers 'unusual advantages, one being that with an engine provided with these rocking levers` it is no longer necessary to interrupt the run of the vessel when the valve-timing is to be altered, thus eliminating the dangers resulting from unmanuvreability of the ship during the time of adjusting the valve gear as well as any waste of time in connection with such work. However, the invention is equally well adapted for use on stationary engines in which very similar advantages may be obtained.

What I claim'is:

1. In an internal combustion engine, the combination of a valve, a cam for controlling the movement of the valve, and a lever for actuating the valve interposed between the valve` and the cam, this lever comprising a pair of arms secured together vand pivotally mounted on a single pivot, one of said arms having an end engaging the cam, and means for varying the position of said end relative to the cam in two directions, approximately normal to each other.

2. In an internal combustion engine, the combination ofv a valve, a cam for controlling the movement of the valve, and a lever for actuating the valve interposed between the valve and the cam, this lever comprising a pair of arms secured together and pivotally mounted on a single pivot, one of said arms having an end engaging the cam, and independent means carried by the arms for varying the position of the said end in radial and tangential directions with. respect to said cam. v

3.*A rocking lever for'internal combustion engine valves comprising the combination of a pair of arms secured together and mounted on a single pivot, one of said arms having an end adapted to be acted on by a cam, and means carried by the arms for effecting independent adjustments of the camengaging arm relative to said other arm, one of said adjustments being in a direction radially of said cam, and the other in a direction tangentially of said cam.

4. A rocking lever for internal combustion engines consisting of two separate parts, two independently movable eccentric members in connection with the said parts, a cam roller carried at the end of one part, valve lifting means at the end of the other part, and a forked boss to the valve lifting 90 part enclosing the bearing portion of the cam roller carrying part.

5. In a valve actuating gear for internal combustion engines a rocking lever comprising a cam roller carrying arm, a valve lifting arm separately therefrom, means for detachably connecting the two arms, a rotatable eccentric bushing in connection with said valve lifting part for alternating the position of the cam roller in a direction radially to thecam, and eccentric means to alter the position of the cam roller in a direction tangentially to the cam.

6. In a valve actuating gear for internal combustion engines a rocking lever comprising a cam roller carrying arm, a valve lifting arm separate therefrom, means for detachably connecting the -two arms, eccentric means in connection withthe valve lifting arm for altering the position of the cam roller in a direction radially to the cam, and an eccentric disc on the rollercarrying arm and rotatable in the valve lifter arm to alter the position of the cam roller tangential to the cam. i

7. In a rocking lever for internal combustion engines, a valve lifting arm having a forked boss, a rotatable eccentric bushing in connection with said valve lifting arm, an upwardly extending flange portion to said bushing, a slot in said flange portion, a stud carried by the valve lifting arm passing lthrough the said slot, a cam roller carrying to detachably connect hoth arms to one an- In testimony whereof I have hereunto set other, two mutually independent eccentric my hand, in the presence of two subscribing members to alter the position of the cam witnesses.

roller radially and 'tangentially in relation GUSTAV PIELSTICK. to the cam, and a graduated scale to enable Witnesses: a correct setting vof both the said eccentric ALEXANDER DE Soro,

members. v ALEXEI PHnIPPoFF.