FR2622254A1 - CURRENT INJECTION PUMP FOR INTERNAL COMBUSTION ENGINE INCLUDING ALTERNATIVE PISTON STROKE - Google Patents

Abstract

a) Fuel injection pump for internal combustion engine with adjustable reciprocating piston stroke. b) characterized in that this locking device consists of a positioning element 19 engaging on the accumulation piston 6, thanks to which the latter is held on the second stop 33 during one of the positions of end of the adjusting element 19. c) The invention relates to a fuel injection pump for an internal combustion engine, the reciprocating piston stroke of which is adjustable.

Description

Current injection pump for combustion engine

  the internal stroke of which the reciprocating piston stroke is

adjustable ".

STATE OF THE ART

  The invention relates to a fuel injection pump characterized in that said locking device consists of a positioning element engaging on the accumulation piston, by means of which the latter is held on the second stop when

  one of the end positions of the adjustment element

  ge. On a known fuel injection pump

  According to the patent application DE-OS 39 23 761, a

  extraction line brings coaxially to a pis-

  pump tone from a working chamber of the pump to a storage space before a reciprocating piston which is in the same way arranged axially by

  relative to the piston of the pump. Extraction conduct

  in which a throttle valve is housed leads to a rotation device connected before a spring-loaded reciprocating piston guided in a cylinder which can rotate axially and by means of a connected rotation device

  to the reciprocating piston. The latter also serves as

  closing of the valve. The rotating device or the valve are placed to close the rotation or the valve are placed to close the extraction line with the reciprocating piston

  coaxial with the piston axis of the pump.

  Such a known embodiment serves as a system

  the so-called silent word of the improvement of the noise of combustion of the internal combustion engine, when

low solicitation.

  The reciprocating piston stroke can not be adjusted and an expensive rotary spool control

  must be provided for the disconnection of the

  lencieux, during a higher solicitation.

  The fuel injection pump according to the invention has the advantage that, thanks to the eccentric pin of the rotation device, the stroke of the reciprocating piston is adjustable by means of a control sleeve and thus simultaneously the reciprocating movement of the accumulation piston can be blocked

  and the operation of the silencer system of the dis-

  positive interrupted. By changing the position of the accumulation piston, the accumulation chamber of

  the working chamber of the pump can be increased.

  As a result, a portion of the fuel flows from the working chamber of the pump, the injection time is thus increased, because it penetrates for injection a smaller amount of fuel per unit time and it follows less turbulent operation

and quieter.

  Other advantages are characterized in that the adjusting member is a setting sleeve

  engaging on a collar of the accumulator piston

  which can be moved by means of a crank arm

  the form of an eccentric stud; the socket of

  sitionnement and the spring radially surround the second stop; the crank arm is located on the front side on a shaft which passes through the wall of the fuel injection pump to the outside, includes

  this place a tuning lever and is attached axially-

  on the wall by a stud engaging in an annular groove of the shaft; the crank arm engages in the wall of the positioning sleeve; this locking device consists of a needle

  valve, guided axially through the piston of ac-

  cumulation of the frontal side with a surface of

  which cooperates as a valve seat with the

  sound between the working chamber of the pump and the

accumulation chamber.

  An accumulation piston is provided by the

  what happens to a rotating device is

  in the same direction as the accumulator piston

  tion, which is connected to a valve pusher that forms

  adjustably the supply port to the accumulator piston.

  mulation and any variation of the deflection

  accumulation piston is impossible.

  Two embodiments of the invention are shown in the figures and are explained

  in more detail in the following description:

  FIG. 1 shows a first exemplary embodiment

  having an adjustment sleeve adjustable by an ex-

  centric; FIG. 2 is a configuration according to which the

  rotating device is established in the

along the piston of the pump.

  FIG. 1 shows a portion of an injection pump, known per se, shown schematically at the point of intersection with a pump piston 1 which slides in a pump cylinder 2 of a combustion chamber

  the work of a pump.3 and by a means which is not

  presented in more detail, moves back and forth in one end of the pump and simultaneously is driven in a rotational movement by which the

  pump plays the role of distributor. In-

  pump piston plays the role of distributor. In-

  by a distribution groove in the surface of

  the pump piston casing, fuel is

  from the pump working chamber in one of the injection pipes which corresponding to the number of cylinders to feed the pump.

  corresponding internal combustion engine, are

  distributed around the pump cylinder 2,

  and each lead to an injection valve indicative of

vidual.

  On the working chamber of the pump 3

  in the splitter injection pump casing 11 rests a cylindrical piece, a head piece of

  cylinder 13 which is secured by screwed anchorages

  pouring the distribution case 25 and the connecting piece 26. This breech element 13 is provided with a pipe, the extraction pipe 12 which brings a junction of the working chamber of the pump 3 to a cylindrical space disposed also in the breech element 13 to the accumulation chamber 5. In this

  last protrudes the accumulation piston 6.

  On the front side of the storage piston facing the storage space 5 it protrudes into a spring chamber 14 and has a shaped portion 22 in the form of a spring cup 23. On it rests a return spring 8 which on the other side rests on the side

  frontal opposite of the spring chamber 14 on a collar

  thrust washer 27. Coaxially to the piston pin

  6 and the spring chamber 14, the bu-

  9 protrudes into a guide bore 24 in

  the distribution case 25 inside the chamber

  5. The stop 9 is provided on the protruding part in the dispensing casing 25 of the abutment flange 27 on which the abutment 9 tapers towards the spring chamber 14. On the flange 27 is supported by the return spring 8 which is placed in the chamber

  spring 14 and on which, on the opposite side to the glue

  rette 27, rests the spring cup 23 applied

  on the accumulation piston 6. The stop 9 and the

  of the accumulation piston - projecting inwards into the spring chamber 14 and formed in the same manner as a conical bolt point, are pressed against each other by the return spring 8. The distance around which the stop 9 and the spring cup 23 can move away from one of

  the other, the race that can be

  the spring 23 connected to the accumulation piston 6 is determined by means of a movable adjusting sleeve 19 in

  an adjustment sleeve cylinder 21. The piston of ac-

  Cumulation 6 protrudes through an opening of the adjustment sleeve 19 and rests with a flange 20 or the cap rim of the spring cup 23 on the adjustment sleeve 19, on the flange of the adjustment sleeve 28. If the sleeve setting is

  moved towards the stop 9, the accumulator piston

  mulation on the flange 20 on the man-

  setting chon 19 moves at the same time, so

  that the accumulation space increases.

  The displacement of the adjustment sleeve 19 is performed by means of a rotation device which consists of a crank 17 which is guided in a crank cylinder 31, placed in the crankcase

  25 perpendicular to the axis of the piston.

  tone of the pump. The crankshaft 17 is provided in the

  direction of the adjustment sleeve 19 of an eccentric bolt

  which engages in the adjustment sleeve 19. A

  the other end, the crank 17 is provided with a

  16, protruding from the timing case 25.

  If this lever 16 is rotated, the eccentric stud 18 is attached to the middle on the outside on the lower side.

  moves on the crank 17 and the adjustment sleeve

  ge 19 rotates simultaneously in radial and vertical direction and can move at maximum curve

eccentric bolt 18.

  A safety pin 40 crossing the

  casing 25 is provided on the crankshaft

  17 to ensure rotation training. The

  safety pin 40 protrudes through the

  outer king of the timing case 25 in a

  notch 41 in the form of a groove of the crankshaft 17.

  check mark 41 may be in the form of a radial cut in the crank or may be only one

  notch 41 segmented throat-like in the way

  17, which only allows, for example,

  180 degrees from lever 16. By the size of this

  notch 41 fragmented throat-shaped in the city

  Brequin 17, it is also possible to determine the maximum

  the in the adjustment sleeve. In this embodiment, the distribution case 25 and the connecting piece 26 are connected by a calibrated sleeve 42 connecting one of the two parts and the two parts are connected by

  bolted anchorages shown in dashed lines

  distribution pump pump 11.

  The embodiment according to FIG. 2 shows a yoke 10 with a rotation device 15 placed in the extension of the direction of the axis.

  of the pump piston 1. The working chamber of the pump

  pe 3 is closed by an intermediate piece 54 which is

  pressed against the injection pump housing

  tribuer 11 by a cylinder head 10 can be screwed on it. A bypass line 12 conducts from the working chamber of the pump 3 through a valve 4 to

  an accumulation chamber 5. This driving behavior

  can be closed by a valve 44.

  12 can be closed by a valve 44.

  it is connected by a valve pusher 45 inserted in the middle through an accumulator piston 6, and this

  valve plunger 45 is itself connected to the device

  It is possible to turn the valve by means of the lever 16, the valve 44 is lifted from its seat 46 and fuel flows into the storage space 5.

  and presses on the accumulation piston 6, the end of which

  mity wears a collar 47 which protrudes into a

  cup spring 48 placed in the chamber to res-

  14. On the spring cup 48 rests the res-

  recall spell 8 which relies on a sleeve 49 in

  hat shape on the closure piece

  re. In the middle, through the accumulation piston 6, the return spring 8, the sleeve 49 and the casing 10 is located the valve pusher 45. The latter

  protrudes through the sleeve 49 in the form of

  skin in the spring chamber 8, this sleeve 49 being

  pressed by the return spring 8 on the cylinder head 10.

  In the cylindrical inner part of the sleeve 49 in the form of a cap is introduced a spiral spring 50

  which is located on a flange 51 of the plunger

  pope 45 and pushes the valve 44 back from its seat 46.

  The silencer device works as follows: If the working chamber of the pump 3 is enlarged, the volume to be compressed is larger and the time lapse until the injection pressure is longer . This means that in no-load operation, that is for a

  low speed of rotation, the delay time in

  lumage and the duration of the injection are fixed in such a way that no phenomenon occurs

  qualifies as "knocking". On the achievements of the

  gures 1 and 2, the accumulation piston 6 works to

  against the force of the return spring 8. The

  accumulation tone 6 can move up to the stop on the stop pin 9. For these achievements, the

  duration of injection is therefore dependent on the

  increasing the return spring 8 and the travel that the accumulation piston 6 can travel through to the stop stud 9. Depending on these two parameters, the injection time in idle mode can

  to be adjusted according to the length of the delay in

Lumage.

  In the embodiment according to FIG.

  operation of the accumulator piston may be

  interrupted and precisely afterwards when the valve 44

rests on its seat 46.

Claims (6)

  1) Fuel injection pump for mo-   internal combustion engines with a reciprocating pump piston (1) in a pump cylinder which delimits a pump working chamber   (3), connected by a constriction (4) to the space of accu-   mulation (5), which is limited by a displaceable piston against the force of a return spring of a first abutment (32) to a second abutment (33) in a   alternative race and is equipped with a   storage piston cage (6), characterized in that   that this blocking device consists of a   positioning member (19) engaging the piston   of accumulation (6), thanks to which the latter is   held on the second stop (33) during one of the   end portions of the adjusting member (19).   2) fuel injection pump according to claim 1, characterized in that the adjusting element (19) is a setting sleeve engaging on a collar (20) of the accumulation piston (6), which can be move with a crank arm (18) in the form of an eccentric stud.   3) fuel injection pump according to claim 2, characterized in that the bushing of   position (19) and the spring (8) surround radially second stop (33).   4) Fuel injection pump according to the   claim 2, characterized in that the control arm   level (18) is located on the front side on a shaft (17) which passes through the wall of the fuel injection pump to the outside, comprises at this location an adjusting lever (16) and is fixed axially on the   wall through a dowel engaging in an annular groove tree.   5) Fuel injection pump according to   claim 4, characterized in that the arm of   level (18) engages in the wall of the sleeve of sitioning (19).   6 ") Fuel injection pump for mo-   internal combustion engine having in a pump cylinder a pump piston (1) driven by a movement   alternative that delimits a pumping chamber of work.   pe (3) which is connected by a throat to the accumulation chamber (5) and which is limited by a piston   moving in an alternating motion   against the force of a spring (8) of a first bu-   (32) to a second stop (33) and is provided with a   locking system of the accumulation piston (6),   characterized in that the blocking device is   consisting of a valve needle (45), axially guided   through the storage piston (6) on the front side with a sealing surface cooperating as a valve seat (46) with the connection between the chamber   the pump (3) and the accumula- tion (5).