US1544177A - Fabrik augsburg-nuernberg - Google Patents

Description

June 30, W5,

G. PIELSTICIK COMPRESSED AIR STARTING DEVICE FOR INTERNAL COMBUSTION ENGINES Filed March 10, 1923 PatentedJime 30, 1925.

UNITED STATES GUSTAV PIELSTICK, OF AUGSBURG, GERMANY, ASSIGNOR TO THE FIRM; CNEN- FABRIK AUGSBURG-NUERNBERG, AKTIENGESELLSCHAFT, OF AUGSBURG, GER- MANY, A CORPORATION OF GERMANY.

COM PRESSED-AIR STARTING DEVICE FOR INTERNAL-COMBUSTIQN ENGINES.

Application filed March 10, 1923. Serial No. 624 218.

To all whom it may concern:

Be it known that I, GUSTAV PIELSTICK, a citizen of the German Republic, and a resident of 7 Stadtbachstrasse, Augsburg, Bavaria, Germany, have invented certain new and useful Improvements in Compressed- Air Starting Devices for Internal-Combustion' Engines, of which the following is a specification.

This invention relates to a compressed air starting device for internal combustion engines, and its main object is the provision of improved air controlled means to facilitate the actuation of the starting valve during the starting period.

With this object in view, the invention involves the provision of a lever for actuating the starting valve'whiclnis continuously rocked by a cam and cam lever. The actuatin lever engages the stem of the starting va ve, but under ordinary conditions the connection between the actuating lever and the stem of the valve is such that the rocking movement of the lever does not affect the position of the valve. Air control means, however, are provided for establishing a different operative connection between the actuating lever and the valve, so that when these means are effective the rocking movement of the actuating lever produced by the cam lever causes the valve to open and close in correspondence with the movement of the cam lever. When the engine is running on fuel these air control means are restored to their original positions so that the valve-actuating lever may again rock without actuating the air valve. k

Further objects and advantages of the invention will beapparent from the following description of the appended drawing, in which Fig. 1 is a vertical section, with parts shown in elevation, of the newstarting device,

Fig 1 is a cross section through the valve spindle on the .line AB'of Fig. 1,

Fig. 2 shows a slightly modified form of the valve operating rocking lever,

Fig. 3 is a view similar to Fig. 1, showing the relative position of the different parts of the mechanism during the starting operation.

Referring first to Fig. 1: a denotes the cylinder head of an internal combustion engine having its starting valve 6 arranged in the usual manner. Said valve is provided with a relief portion 0 and is normally held closed by the action of a compressionthrough which the two levers g and it pass; I

the former being the valve operating rocking lever pivoted at z' tothegcam lever 72:. This cam lever is in the shape-of a twoarmed lever and is controlled by a roller Z and cam m. The auxiliary lever 72. is fulcrumed to a lug n of the cam lever and, with one of its ends, is connected to lever g by means of a link 0 so that a closed link drive is formed in this Way consisting of the four members 11., g, 0, h. The uppermost portion of the valve spindle is-made to form a cylinto slide loosely and to rest upon lever h.

The valve spindle isprovided with a passvarious parts of the device are at rest and in the position shown in Fig. 1. -Valve b is held closed by its spring (Z and there isno compressed air in the cylinder to act on 'der p within which a piston'q is arranged the piston which, therefore, only rests with its own weight upon lever 72.. It will be seen that in this position of the parts, lever g is able to follow the movement of the cam lever by rocking on itssupport in the slot same time also preventing the free end of lever g from moving aside when being rocked. The pivot 23 now serves as a fulcrum on which lever 9 may rock under the action of the cam lever k and thereby open the valve by pressing it downwardly against the resistance of its spring d. This action is repeated at every rotationof the cam shaft as long as compressed airfis admitted, i. e. until the engine begins to work on fuel.

Lever h is p'rovided'with a set screw za adapted to bear against the shorter arm' of cam lever is and to thereby adjust roller 1 in relation to cam m. A springofastened to the lever L and acting on an extended arm of lever It serves to relieve the, cam to some extent during the normal work of the engine.

\Vhat I claim is 1. In a compressed air starting device'for internal combustion engines the combination with a starting valve,a cam and a cam lever, of a valve operating rocking lever pivoted to the cam lever and resting looselyupon a:

portion of the valve spindle, an auxiliary lever, means to connect both the latter levers .at'their free ends, a cylinder on the valve spindle, a loosely mounted piston in said cylinder, passage ways for compressed air in the valve spindle terminating in the cylinder, said piston adapted to press said auxiliary lever against the-valve spindle.

2. In a compressed air starting device for internal combustion engines, in combination with a starting valve, a cam and a cam lever, of a valve operating rocking lever pivotedto the cam lever and passing loosely through a slot in the valve spindle, an auxilia lever pivoted to a lug on the cam lever an passing through another slot in the valve spindle, a link to connect the freeends of both the latter levers, a cylinder on the valve spindle, a loosely slidable piston in said cylinder,-anair passage in the valve spindle terminating in the cylinder at a point above the piston, and a spring to normally keep the valve closed, said piston, when under pressure, adapted to press said auxiliary lever against the valve spindle.

3. In a compressed air starting device for internal combustion engines, a valve operating closed link drive consisting of. a cam lever, a loosely mounted rocking lever pivotally connected at one of its ends to the cam lever, an auxiliary lever also pivotally connected to the cam lever and disposed approximately parallel to the said rocking lever, pneumatic means to block saidau xiliary lever during the starting period of the engine, a link to connect the free ends of both the latter levers and to serve as a fulcrum for the rocking lever when the auxiliary lever is. in its blocked position, and

' means to rock said rocking lever on its link connection to depress the valve against the resistance of the valve spring.

' 4. In a compressed air starting device for internal combustion engines, a valve operating closed link drive consisting of a cam. lever, a loosely 'mounted rocking lever pivotally connected at one of its ends to the cam lever, an auxiliary lever also pivotally connected to the cam lever, a cylinder carried by the valve spindle and in communication-with the starting air conduit by means of. a passage in the valve spindle, a piston mounted to loosely slide in the cylinder and to block the auxiliary lever during the starting period of the engine, a link to connect the free ends of both the said levers, latter link normally permitting the rocking lever to move under the action of the cam lever, without actuating the valve and to serve as a fulcrum for the rocking lever when the auxiliary lever is in its blocked position, and

means to rock the rocking lever on said fulcrumin order to depress the valve.

5. In a compressed air starting device for internal combustion engines, a valve operating closed link drive consisting of a cam lever, a loosely mounted rocking lever pivoted at one of its ends to the cam lever, an auxiliary lever also pivotally connected to the cam lever, a set screw between the cam lever and the auxiliary lever to adjust the positionvof the cam roller, pneumatic means to block the auxiliary lever during the start ing period of the engine, a link pivotally connecting the free ends of the said rocking,

and auxiliary levers and to serve as a fulcrum for the rocking lever when the auxiliary lever is in its blocked position.

6. Ina compressed air starting device for internal combustion engines, a valve operatlever, a loosely mounted rocking lever' pivoted at one of its ends to the cam lever an auxiliary lever also pivotally connected GUSTAV PIELSTIOK.

Witnesses:

Amxm PHILIPPOFF, ALEXANDER on Sam.

'ing closed link drive consisting 'ofa cam

Images