FR2747620A1 - FUEL SUPPLY SYSTEM OF AN INTERNAL COMBUSTION ENGINE - Google Patents

Abstract

Fuel supply system for an internal combustion engine, consisting of a fuel tank (10) and an incorporated tank unit (14), disposed therein, in the holding body (15) of which has a fuel delivery group (16), the suction connection (25) of which draws from a balancing vessel (29) characterized in that the balancing vessel (29) is connected to the body of holding (15) of the incorporated tank unit (14).

Description

State of the art The invention relates to a system for supplying

  fuel of an internal combustion engine, consisting of a fuel tank and an incorporated tank unit, disposed therein, in the holding body of which

  there is a fuel delivery group, the connection

  suction cord sucks from a balancing vessel.

  Conventional systems for supplying fuel to an internal combustion engine consist of a fuel tank and an integrated tank unit which

  cooperates with. The integrated tank unit is mounted for this-

  la in an opening on the face of the tank cover

  fuel and enters through the end which carries the cooling unit

  fuel leak in the fuel tank. Inside

  inside the fuel tank we have next to

  the opening on the face of the lid on the bottom a vase of equilibrium

  brage. This balancing vessel is connected by channels to the tank.

  see fuel, so that the fuel delivery group can draw fuel from the balancing vessel. For this, the integrated tank unit is supported on the bottom plate of the balancing vessel. The balancing vessel prevents the suction side, in case of strong

  movement of the fuel tank, when the fuel level

  wrinkling is weak at the same time, to no longer dive into the

fuel.

  Balancing vessels made in this way have the disadvantage that they must be fixed before mounting the integrated tank unit by welding or by

  screwed into the fuel tank. This cannot be done

  only costly in the case of fuel tanks

  plastic, because in this way layers

  fuel diffusion stopper may be damaged

  or different plastics are not allowed to

  from each other only with difficulty. In addition, the balancing vases are most often made with a size such that they can only be produced by an expensive process.

and difficult to insufflate.

  Advantages of the invention The system according to the invention serving to supply fuel to an internal combustion engine is characterized in that the balancing vessel is connected to the holding body of the incorporated tank unit. On the other hand, it therefore has the advantage that, instead of being fixed as in the fuel tank,

  then connected to the holding body of the integrated tank unit

  see by means of coupling elements and it can thus be mounted as a prefabricated unit, facilitating its assembly, in a single work sequence. In this way, the fuel tank can be produced in a considerably simpler manner and reduce the costs of separate mounting of the balancing vessel. According to other characteristics of the invention:

  - the balancing vessel is connected by at least one ac element

coupling to the holding body,

  - at least one of the coupling elements, when the unit

  of the tank is in the assembled position, is in preload and presses the balancing vessel by its bottom plate against the bottom of the fuel tank, - an elastic band is used as the coupling element

  extends parallel to the longitudinal axis of the indoor unit

  tank rig and which has at least one point of in-

  bending which extends perpendicular to the longitudinal axis of the integrated tank unit, - the integrated tank unit is mounted in a recess on the face of the fuel tank cover,

  - the recess is sealed, when the integrated unit

  tank rigging is in mounted position, by a plate of

  clamping, formed on the holding body of the indoor unit

  tank rigging, - the outer contour of the balancing vessel is no more

  larger than the outline of the recess in the reservoir

  see fuel, - the integrated tank unit has a device serving

  detecting the filling state of the fuel tank.

  This is how it is necessary to have an as-

  as complete as possible hacking of available fuel

  in the fuel tank, that the balancing vessel

  installed on the bottom of the fuel tank. Gap variations that occur between the side of the cover and the

  side of the bottom of the fuel tank, such as those that

  for example due to temperature variations or

  to manufacturing tolerances, are compensated according to the invention.

  tion by the elasticity of the coupling elements. These coupling elements which are under prestress in the assembled position in fact ensure that the balancing vessel which is then no longer fixed on the fuel tank, takes

  nevertheless, permanent support on the bottom of the fuel tank

  burant. The distance between the suction connection of the fuel delivery group and the bottom plate of the balancing vessel is bridged by an equally elastic suction filter, so that the quantity of fuel sucked

  remains constant regardless of the operating condition.

  Drawings The present invention will be described below in more detail from an embodiment, shown in the

single figure.

  The single figure shows, in section, according to a representation

  schematic feel an integrated tank unit, mounted

in a fuel tank.

  Description of the exemplary embodiment.

  The single figure shows a fuel tank 10 which is limited on one side by a cover and on the other side by a bottom 12. The side of the cover 11 has a recess 13, in which an integrated unit is mounted tank 14 for delivering fuel from the tank

  of fuel 10 to an internal combustion engine, not shown

  smelled. The integrated tank unit 14 is formed by a holding body 15 which carries a fuel delivery group

  16. The retaining body 15, consisting of a single piece, pre-

  feels a cylindrical wall zone 21 and is preferably made of a fuel-resistant plastic or of a polymethylene oxide (POM). At the end which is outside the fuel tank 10, a clamping plate 17 has been formed on the retaining body 15. Electrical and hydraulic connections 18, 19.1, 19.2 pass through the

  clamping plate 17 on its face located above the reflector

  fuel supply 10. The integrated tank unit 14 is connected by these connections 18, 19 to the power supply or to the arrival and return of a fuel circuit of an internal combustion engine. In addition, the clamping plate 17 has a collar 20 which goes all around, by which it rests on the side of the cover 11 of the fuel tank 10 and sealingly closes the recess 13. At the end of the body of

  holding 15 which is inside the fuel tank

  rant 10, a collection device, in the form of a sleeve 22, is placed in the center which, by means of connecting spacers 23, is connected to the wall zone 21 of the retaining body 15. The retaining body 15 and the collection device 22 can also be made in one piece. The collection device 22 which projects from the wall zone 21, serves to receive and

  to fix in position the fuel delivery group 16.

  The fuel tank housing 16 surrounds an electric unit

  drive plate, which has not been further depicted

  tail, and which drives a pump, also not shown,

  with a pressure connection and a suction connection 24, 25.

  The electric pump drive unit is connected by

  via a cable 26 which brings the current, to the connections

  corresponding 18 on the clamping plate 17. The connection

  pressure cord 24 of the pump of the delivery group

  fuel 16 is coupled by a pipe 27 to the first rac-

  hydraulic cord 19.1 on the clamping plate 17. The connection

  suction cord 25 of the pump is turned towards the bottom side 12 of the fuel tank 10 and is provided with a suction filter 28. This suction filter 28 is formed by an elastic support frame, on which is stretched a filter cloth

  and it covers the necessary distance between the vacuum fitting

  25 of the pump and the bottom plate 35 of a balancing vessel

  circuit 29, from which the pump sucks. The balancing vessel 29 has, perpendicularly to its bottom plate 35, an edge 34 which goes all around. The return 19.2 of the fuel circuit of the internal combustion engine is arranged

  in such a way that it opens into the balancing vessel 29.

  As a variant, it is possible to close the orifice of the balancing vessel 29 which is turned towards the side of the cover 11,

  by a cover plate. In this cover plate

  recesses were then formed, through which the fuel delivery group 16 and the return 19.2 of the circuit.

  fuel cooked enters the balancing vessel 29.

  The role of the balancing vessel 29 is to prevent

  the suction connection 25 of the fuel delivery group

  rant 16 no longer dives into the supplied fuel, but comes out of it, in the event of strong movements of the fuel tank 10 and at the same time when the filling level of the tank is low, which would briefly stop the arrival of the

  fuel to the internal combustion engine.

  The filling of the balancing vessel 29 takes place by means of bores 30, arranged above the plate.

  bottom 35, bores which connect the inside of the balancing vessel

  connection 29 to that of the fuel tank 10. The filling of the balancing vessel 29 can likewise take place by means of a

ejector set or not set.

  The balancing vessel 29, which is disposed at a certain distance from the retaining body 15, along the same axis, has a diameter which corresponds substantially to that of the retaining body 15. The retaining body 15 and the balancing vessel 29 are connected to each other by elastic bands 32, so that the balancing vessel 29 is movable relative to the holding body 15, fixedly mounted in the tank

  fuel. For this, the elastic bands 32 extend pa-

  parallel to the longitudinal axis 36 of the integrated control unit

  servoir 14 and respectively have an inflection point 33, oriented relative to the longitudinal axis 36. The elastic bands 32 can in this way be tensioned when the integrated tank unit 14 is in the mounted position

  and ensure that the balancing vessel 29 takes on permanent

  press on the bottom side of the fuel tank 10. A

  instead of elastic bands 32 it is also possible to mount res-

sausage spells.

  Variations in the height of the fuel tank due, for example, to manufacturing tolerances or

  the influence of heat can be compensated in this way

  sées. It goes without saying that it is possible to make modifications to the embodiment which has just been described without departing from the spirit of the invention. Thus, for example, it is conceivable to have a unit that can be mounted outside beforehand, in the case where the balancing vessel 29 is rigidly connected to the collection device 22, but however the elastic bands 32 would be arranged towards the side of the cover 11 of the fuel tank 10, above the point of

  connection of the collection device 22, on the retaining body 15. In this way, the relative movements which could occur between the fuel delivery group would be avoided

  rant 16 and the balancing vessel 29.

R E V E ND I C A T IONS

  1) Fuel system for a combustion engine

  internal tion, consisting of a fuel tank (10) and an incorporated tank unit (14), disposed therein, in the holding body (15) of which there is a fuel delivery group (16), the suction connection (25) of which draws in from a balancing vessel (29), characterized in that the balancing vessel (29) is connected to the holding body (15)

  of the incorporated tank unit (14).

  2) System according to claim 1, characterized in that the balancing vessel (29) is connected by at least one element

  coupling (32) to the holding body (15).

  3) System according to one of claims 1 or 2,

  characterized in that at least one of the coupling elements (32), when the incorporated tank unit is in the mounted position, is located

  prestressed and presses the balancing vessel (29) by its plate

  that bottom (35) against the bottom of the fuel tank (10).

  4) System according to one of claims 2 or 3,

  characterized in that an elastic band is used as the coupling element (32)

  which extends parallel to the longitudinal axis of the indoor unit

  tank rig (14) and which has at least one point of in-

  bending (33) which extends perpendicular to the axis

  longitudinal of the integrated tank unit (14).

   ) System according to one of claims 1 to 4,

  characterized in that the integrated tank unit (14) is mounted in a recess (13) on the face of the cover (11) of the fuel tank (10). 6) System according to claim 5, characterized in that

  the recess (13) is sealed, when the integrated tank unit (14) is in the mounted position, by a clamping plate (17), formed on the holding body (15) of 5 l integrated tank unit (14).

  7) System according to one of claims 1 to 6, characterized in that

  the outer contour of the balancing vessel (29) is not larger than the contour of the recess (13) made in the fuel tank (10).

  8) System according to one of claims 1 to 7, characterized in that

  the integrated tank unit (14) has a device for detecting the filling state of the fuel tank (10).