DE1954903B2 - FUEL INJECTION NOZZLE FOR COMBUSTION MACHINES - Google Patents

Description

The invention relates to a fuel injection system in the spring chamber of an injection nozzle nozzle for internal combustion engines with a nozzle shark leaf spring for acting on the valve needle ter, at whose end facing the combustion chamber, is from the British patent a nozzle body is attached, the one coaxial with the 286 445 already known. With this known Aus nozzle holder axis arranged, axially slidable, 55 guide shape, however, the spring chamber is also the valve needle controlling the fuel flow is formed in the upper area of the nozzle holder, which by a in a spring chamber in the consisting of several spring leaves leaf nozzle holder Supporting spring in a fuel spring perpendicular to the longitudinal axis of the nozzle holder direction of flow is held in the closed position. Accordingly, this injector requires im and which the fuel over a substantially larger installation space than in the wall 60 upper area of the nozzle holder runs parallel to the nozzle holder axis in the kidney area, whereby a nozzle shape escapes Bore is fed, which stands at one in, which is quite unfavorable in terms of installation one perpendicular to the nozzle holder axis on nozzle ratios.

holder formed connecting piece running Further useful embodiments of the invention

Fuel supply duct is connected. 65 development, the arrangement and design of the spring leaf

A fuel injection nozzle with these features tes are contained in the subclaims

is requested from Austrian patent specification 133 661.

knows. In this known embodiment, the An embodiment of the invention is according to

standing on the basis of the sectional drawing explain in more detail

tcrt -

A substantially cylindrical nozzle holder Ki del by marking it with M

tears at its threaded end side of the stop planes

a nozzle body 11 in a stepped cylindrical 5 Im ^Dü % ^nhalte _o ^r * "" ^ _n

Shape. It is attached to the holder by means of a ^l - ^mmi - ^{r 17} , locking nut 12. The narrower part of the nozzle body extends through a hole in the
Union nut 12 and is provided at the end with an opening through which the fuel can escape
can.

This opening is above a fuel supply

bore 13 in the nozzle body and in the nozzle holder end supports the «aerou

is provided with a fuel supply channel 14 in ab, which is in a cap "J« r "j _{5 of the} valve needle. Connection, which is perpendicular to the nozzle 15 sits on ^the _ ^ve . ^r ' ^a " f * ^e " _ic h the spring leaf in one

holder axis extending connection piece at the shark At the lower end ^su ^ ^. _{in pineni}

, it is intended to control the fuel ^^^ Z ^ ST ^ s in axial flow through the opening is a valve needle

present in the nozzle body, which oppose the front "nniPBcnuui ^ u" _o -

moving the tension of a spring axially ': ann. In , 0 is slidable. Im vo meg * ^, ™ ^

drive is pressurized fuel the valve is the chamber ^ ' ⁿ ^ ^sctl ' _{holder 10 is a} stem-

tilnadel, which causes a movement of the same abutment 20 and the "^ an _m rtel \ * -

gen causes the force of the spring and thus _to ^{prevent the ^ fcV} f ^ % , nevertheless

allows fuel to escape. Wegirag des W deriagers zu ζ _{rf m er} _ In order to adjust the amount of movement of the valve needle, however, an axial mtenwhv * on an adjustable

borders, this has an extended end 15, possible ° ^as J ^Vlder1 ^ _e ^e i _{ssen the} through the

which can en by a recess in a Lifting REN_ Ansch ^ g ^ ^ '™ _{ft verkndert expectant,}

plate 16 extends. The stop plate is wan ν exerted between the spring leaf

1 sheet of drawings

Claims (1)

Spring chamber in the upper part of the nozzle holder from Patent claims: formed, with the spring over one in the lower part 1. Fuel injection nozzle for Brennkraftma- the nozzle holder arranged; Pressure pin on the machine with a nozzle holder, which acts on the valve needle. The connection piece for the end facing the combustion chamber a nozzle body 5 fuel inlet must be attached to the nozzle holder below the one arranged coaxially to the nozzle holder spring chamber, since only in the lower axis, axially slidable, the part of the holder is one for receiving the force. Fuel flow controlling valve needle auf- stoffzuführbohrung provides sufficient wall thickness, which is through a spring chamber in the. However, the installation of such fuel injector nozzle holder springs in fuel io creates difficulties wherever the direction of flow is kept in the closed position.
Wall of the nozzle holder parallel to the nozzle holder- The invention is therefore the task of the axis running bore is supplied, the reason for a ^ fuel injection nozzle of the type described in a perpendicular to the nozzle holder 15 options for their installation axis on the nozzle holder also formed connection in the case of unfavorable and confined spaces, to create a fuel supply duct that runs with a nozzle. is closed, characterized by this object is achieved according to the invention n e t, d; Γ which solves essentially over the entire length that essentially over the entire length Length of the nozzle holder (10) extending 20 of the nozzle holder extending spring chamber The spring chamber (17) is arranged eccentrically to the nozzle holder- eccentrically to the nozzle holder axis and axis is arranged and a spring leaf (18) designed as a spring leaf "spring in the longitudinal direction takes up trained spring in the longitudinal direction, device takes up, with the spring hammer and valve wherein the spring chamber and valve needle-side needle-side support points of the spring leaf in the The support points of the spring leaf (18) lie in the nozzle holder axis and the spring leaf is in the senhalterachse and the spring leaf (18) is curved in the direction of the eccentricity of the spring chamber. Direction of eccentricity of the spring chamber (17) and that the fuel supply in the area of is curved, and that the fuel supply hole through the eccentric arrangement of the spring chamber tion (13) in the area of the giößten wall thickness of the nozzle holder obtained by the eccentric Arrangement of the spring chamber (17) obtained 30 runs. largest wall: ärk ~. of the ~~) üsenh alters (10) through the use of an eccentric to the nozzle Runs. senhalterachse arranged, a spring leaf as 1. Fuel injection injected according to claim 1, Eder closing £ ^f for the valve needle in the longitudinal direction characterized in that the sheet thickness of the receiving spring chamber, it is possible in the Du- Spring leaf (18) increases towards the middle. 35 senhalter in compliance with a proportionate 3. Fuel injection nozzle according to claim 1 of small diameter also in the area of the spring or 2, characterized in that the valve chamber to receive a wall cross-section in which needle-side support point of the spring leaf (18) the fuel supply bore can run without in one to an extended end (15) of the valve that the risk of material breakage as a result of high tilnadel attached cap (19), which also occurs 40 fuel pressure. The connecting piece can Like the one on the spring chamber side, axially adjustable in the entire axial extent of the Ren support point forming abutments (20) are arranged for the nozzle holder. Furthermore The installation of the spring leaf with a recess can also reduce the overall height of the injection nozzle is provided. gladly. Furthermore, a long pressure pin can be placed between 4. Fuel injection nozzle according to claim 3, 45 valve needle and spring can be avoided because the characterized in that the ends of the spring leaf without enlarging the nozzle holder spring leaf (18) are rolled up. diameter in the immediate vicinity of the valve needle can attack. This avoids an additional component that increases the movable masses the.