US1862459A - Injection nozzle for internal combustion engines - Google Patents

Description

0. BAUR June 7, 1932.

INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES Filed June 11. 1929 9M 0m Kiw/ Patented June 7, 1932 UNITED STATES PATENT! OFFICE 1 OTTIM'AR BAUR, OF STUTTGART, GERMANY, A SSIGNOB TO ROBERT BOSCH AKTIEN- GESELLSCHAFT, OF STUTTGART, GERMANY INJECTION NOZZLE FOR INTERNAL COMBUSTION ENGINES Application filed June 11, 1929, Serial no. 369,984, and in Germany August so, 1928.

This invention relates to a fluid-controlled holder transmits its closing pressure to the In the needle through a connecting rod.

known jets of this type the limiting of the m movement of the jet needle is effected by a stop engaging the connecting rod so that in addition to transmitting the tension of the closing spring, the said connecting rod also transmits the very considerable force acting on the surface of the abutment limiting the movement. This may result in deformation of the connecting rod, which is kept as light and thin as possible and is usually very long, and this deformation will cause a variation in the length of the needle stroke.

According to the invention this disadvantage is removed by the abutment limiting the movement engaging directly on one shoulder of the raised needle so that the connecting rod only has to transmit the tension of the closing spring. If the raised needle guided in the jet member is allowed to abut with one shoulder against a flange of the jet holder, the limitation of movement thus obtained will be considerably simpler than in the known ets.

One form of construction of the object of the invention is shown in longitudinal section in the drawing.

known manner the fluid controlled jet needle d presses against the lower end of the jet holder (1 by means of a screw cap b. The needle carries at its other end a pin f of less diameter than spindle e mounted in the jet member and projecting into the holder a. One end of a connecting rod 9 engages the pin whilst the other end bears against the closing spring h mounted inthe upper portion of the holder, a spring washer being interposed. p

The lower face of the jet holder, against which the jet member is forced, partially covers a needle guide aperture in the et memeo ber. This covering portion 2' forms an abut- A jet member 0 in which is inserted in of greater diameter than said aperture, said ment for the shoulder 11 of the pin f on the guide spindle e of the jet needle. The play- 122. between the abutment z and the. shoulder determines the maximum movement of the needle which is not adjustable in the example shown;

I claim:

1. An injection nozzle for internal combustion' engines comprising in combination a holder, a jet membermounted on said holder. and having a bore formed therein, a piston element mounted in said bore, a needle carried by one end of said piston element, said piston element being of a length less than the bore by the predetermined amount of lift of the needle, a pin of less diameter than the piston element mounted upon the other end of said piston element and extending into an aperture formed in said holder of less diameter than the bore, whereby said piston element abuts against said holder to limit the opening of said needle. V

2. An injection nozzle for internaI combustionengines comprising in combination a holder, a jet member having a bore formed 75 therein, a piston member of less length than said boremounted therein, a needle carried by one end of said piston memberand coop- 'erating with a nozzle opening in said jet member, said jet member being mounted upon said holder to partially close the open end of said bore and limit the movement of said piston, a pin of less diameter than the piston mounted upon the other end of the piston and extending into an aperture 35 formed in said holder of less diameter than said bore, and a loading spring mounted in said holder and cooperating with said pin to bias said needle to the closed position.

3. An injection nozzle for internal combustion engines comprising in combination a holder having a plane surface area within which is located an aperture of a fuel duct,

a jet member having a bore formed therein jet member being mounted on said plane surface with said bore in registry with said aperture, a piston element mounted in said bore, a needle carried by one end of said piston element, said piston element being of a len h less than the bore by the predetermine amount of lift of the needle, a pin of less diameter than the piston element mounted upon the other end of said piston element and extending into said aperture, and a loading spring mounted in said holder and cooperating with said pin to bias said needle to closed position.

4. An injection nozzle for internal combustion engines comprising in combination a holder having a plane surface area within which is located the aperture of a fuel supply duct and the aperture of a fuel drainage duct, a jet member having a bore formed u therein of a greater diameter thanthe aperture of said drainage duct and being provided also with a fuel duct adapted to register with the fuel supply duct on said holder, said jet member being mounted on said plane so surface with said bore in registry with said drainage aperture and with registry between said fuel sup ly ducts, a piston element mounted in said bore, a needle carried by one end of said piston element, said piston eleu ment being of a length less than the bore by the predetermined amount of lift of the needle, a pin of less diameter than the piston element mounted upon the other end of said piston element and extending into said aperao ture, and a loading spring mounted in said holder and cooperating with said pin to bias said needle to closed position.

In testimony whereof I have hereunto afiixed my signature. OTTMAR BAUR.

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