FR2723147A1 - DEVICE FOR TRANSFERRING FUEL FROM A TANK TO THE INTERNAL COMBUSTION ENGINE OF A MOTOR VEHICLE COMPRISING A RETAINING TANK PLACED IN THE SUPPLY TANK - Google Patents

Abstract

a) Device for transferring fuel from a tank to the internal combustion engine of a motor vehicle comprising a holding tank placed in the supply tank b) Device characterized in that the closure member of the connection (16) opens in the direction of transfer to the motor (18), the shut-off valve (24) has a passage which, when the valve (24) is closed, is the only communication between the unit (14) ) and motor 18.

Description

"Device for transferring fuel from a tank to the engine

  internal combustion of a motor vehicle

  comprising a holding tank placed in the tank

see feed ".

  STATE OF THE ART: The invention relates to a device for transferring fuel from a supply tank to the internal combustion engine of a motor vehicle, comprising a

  holding tank placed in the supply tank

  tion, a fuel transfer unit sucking the car-

  burant in the holding tank and whose side of

  pressure is connected to the internal combustion engine, a con-

  branch bypass whose communication with the pressure side of the fuel transfer unit is controlled by a shut-off valve as well as a jet pump connected to

  the bypass line which supplies the recovery tank

  fuel resistance, the shut-off valve having a closure member loaded by a spring and cooperating with a

  seat associated with the bypass line.

  Such a device is already known according to the docu-

  ment DE 43 24 981 A1. This device consists of a

  see retainer placed in the tank proper from where a fuel transfer unit sucks the fuel, the pressure output of this unit being connected to the internal combustion engine. There is a bypass line

  connected to the pressure side of the control transfer unit

  delivered by a shut-off valve; when you exceed a certain

  pressure close to the pressure side of the transfer unit, this valve clears the passage of the line

  branch to the pressure side. The conduct of

  rivation is connected to a jet engine pump which transfers

  the fuel in the holding tank.

  The shut-off valve includes a spring loaded valve member cooperating with a seat in the bypass line. The shut-off valve must especially guarantee when starting the internal combustion engine, when the fuel transfer unit does not yet deliver a maximum flow, that part of the small quantity delivered is diverted to the engine fluid pump ; this would interfere with starting or running the combustion engine

  internal, as the fuel supply would be insufficient

health.

  However, there are realizations of disposi-

  fuel transfer devices whose transfer unit supplies fuel even before the engine starter

  is launched, so that on the pressure side, it spreads

  blisse enough pressure to open the shut-off valve

  rêt. In this case, the shut-off valve is already open

  when the starter of the internal combustion engine is actuated

  dull, so that the internal combustion engine receives insufficient fuel until the pressure on the pressure side of the supply unit has dropped again enough for the shut-off valve to close. In summary, this influences behavior

  when starting the internal combustion engine and its function

after start-up.

Advantages of the invention:

  The present invention aims to create a dis-

  positive fuel transfer allowing fuel

  sufficient fuel for the engine in the de-

  marrage and at the start of its startup.

  To this end, the invention relates to a device corresponding to the type defined above, characterized in that device characterized in that the member for closing the connection between the pressure side of the fuel transfer unit and the internal combustion engine

  opens in the direction of transfer to the combustion engine

  internal valve and the closure valve has at least one passage which, when the closing valve is closed, the only communication between the pressure side of the unit

  fuel transfer and combustion engine

  dull, this passage constituting a choke point for

  the fuel supplied to the internal combustion engine.

  Advantages of the invention: The device according to the invention for transferring fuel from a tank to the engine of a motor vehicle offers the advantage, with respect to the state of the art, that the stop valve opens only when

  the fuel transfer unit dispenses a certain amount

  fuel tity; the pressure drop on the way raises

  then the shutter member relative to the seat. Choose

  accurately measuring the amplitude of the flow and the pre-

  constraint of the shutter spring, there is an uplift of the shutter member relative to its seat from a certain flow which will be sufficient to allow both correct operation of the engine at

  internal combustion and that of the jet pump.

  According to other advantageous features of the invention:

  - the shutter member includes at least one step-

  wise; - the shutter member is sliding in a bore and at least one passage is formed by an extension of the bore; - the shutter member, when the closing valve is open, controls in the direction of opening an additional passage connecting the pressure side of the fuel transfer unit to the internal combustion engine; - the shut-off valve comprises a housing with a stepped cylindrical bore, the shutter member, when the shut-off valve is closed, being in the segment

  cylindrical drilling of small diameter and when the

  stop pope and open it is in the segment of the

  large diameter cylindrical bore, and between the periphery

  risk of the obturator and the segment of the cy-

  lindrique of large diameter, there is an annular volume

forming an additional passage.

  - the shut-off valve has at least one body

  provided with a cylindrical bore in which the shutter member

  ration is guided in sliding, this cylindrical drilling is

  continuing with a guide segment for the shutter member

  ration, this guide segment corresponding to an increased section compared to that of the cylindrical bore and the closure member, when the closing valve is closed, plunges into the cylindrical bore and when the stop valve is open, l the sealing member is only in the guide segment and in that between the

  periphery of the obturation member and the guide segment

  age, there remains an intermediate volume which constitutes the

additional passage.

Drawings:

  An exemplary embodiment of the invention is shown

  shown in the drawings and will be described below in detail.

more detailed.

  Thus: - Figure 1 shows a transfer device

  of fuel from a tank to the internal combustion engine

  dull motor vehicle, according to a simplified diagram;

  - Figure 2 shows a shut-off valve of the device

  positive of Figure 1, on an enlarged scale; - Figure 3 is a section of the stop valve along line III-III of Figure 2; - Figure 4 shows a variant of the valve

Figure 2.

  Description of the exemplary embodiment:

  Figure 1 shows a transfer device

  fuel from a fuel tank 10. The re-

  power supply 10 is subdivided into a chamber

  mant a holding tank 12. The device comprises a fuel transfer unit 14 comprising an electric motor and a pump housed in the same housing. The transfer unit 14 mounted in the holding tank 12 sucks the fuel there. At the outlet (pressure side), the transfer unit 14 is connected by a pressure line 16

to the internal combustion engine 18.

  The pressure line 16 includes a non-return valve 20. A return line 22 returns from the internal combustion engine 18 to the supply tank 10; the fuel supplied by the transfer unit 14 and not used by the internal combustion engine 18 returns by this

  return line. The mouth 23 of the return line

  tower 22 is arranged so that the fuel that comes out of it

  shore in the holding tank 12.

  Upstream of the non-return valve 20, the

  pressure line 16 includes a shut-off valve 24 o

  share a bypass line 26. The bypass line

  tion 26 has a segment 28 disposed near the bottom 11 of the tank 10; this segment includes a jet pump 30. The jet pump 30 according to the embodiment is arranged

  flat and its pressure tube 32 passes through a side wall

  line 13 of the holding tank 12 to open into this tank 12 so that the jet pump 30 sends the fuel

in this tank 12.

  The shut-off valve 24 comprises, as shown in the

  FIG. 2, a valve body 34 to which a segment is connected

  ment 16a of the pressure line 12 going to the unit

  transfer 14 and a segment 16b of the pressure line

  sion 16 going to the internal combustion engine. The body 34 also comprises a cylindrical bore 36 into which opens a nozzle 38 disposed substantially in the radial direction relative to the longitudinal axis 35 of the body 34 and the projecting end of the body 34 of which receives the bypass pipe 26. The nozzle 38 is bent inside the cylindrical bore 36 with a segment 39 which extends substantially parallel to the longitudinal axis of the body 34 in the direction of fuel flow

  supply to the internal combustion engine 18. The extreme

  frontal mity of segment 39 of nozzle 38 forms a seat

valve 40.

  In the closed position of the shut-off valve

  24, a shutter member 42 enters the cy-

  lindrique 36; this member 42 is in the form of a piston. Gold-

  shutter gane 42 is hollow and has a bottom 44 cooperating with the seat 40; this background continues with a

  cylindrical wall 46 guided in the cylindrical bore 36.

  The cylindrical bore 36 extends along the segment 39 of the nozzle 38 to beyond the seat 40. Coaxial to this cylindrical bore 36, beyond the seat 40, the body 34 of the valve comprises a segment of guide 48 in which the shutter member 42 slides. The guide segment 48 has several ribs 50 distributed around the periphery of the shutter member 42, these ribs spaced apart

  others being substantially parallel to the longitudinal axis

  nal 35. The ends of the ribs on the side of the long axis

  tudinal 35 (see Figure 3) are substantially located on the same diameter as that of the cylindrical bore 36, which allows the sliding guide of the shutter member

  42. Between the ribs 50, there are two intermediate volumes

  res 52 which constitute an extension of the section from

  of the cylindrical bore 36. To make the guide segment

  dage 48, one can for example realize in the length cor-

  corresponding to the cylindrical bore 36, the ribs forming the intermediate volumes 52. A closing spring 54 plunges into the shutter member 42; this spring is a helical compression spring mounted between the face of the bottom 44 opposite the seat and a front wall of the body 34; this spring pushes

  the shutter member 42 against the seat 40. The shutter member

  valve 42 is mounted so as to open in the direction of supply of fuel to the internal combustion engine 18, in the pressure line 16 which connects the pressure side of the transfer unit 14 to the combustion engine

internal 18.

  The shut-off valve 24 has at least one step

  sage which, in the closed position of the valve constitutes the only communication, shows the pressure side of the fuel transfer unit and the internal combustion engine 18; this passage forms a choke point for

  the fuel supplying the internal combustion engine 18.

  This single passage can be constituted by an opening 56 made in the bottom 44 of the shutter member and / or by

  at least one cavity 58 at the periphery of the shutter member

  ration 42 and / or by at least one section extension 60 of the cylindrical bore 36. The section extension 60 can be

  realize in the form of a groove or a groove.

  The operation of the device described above is as follows: When starting the internal combustion engine 18, the fuel transfer unit 14 first transfers

  only a small amount of fuel intended for mo-

  internal combustion tor 18. The shut-off valve 24 is then closed and its closure member 42 plunges into the

  drilling 36 by pressing against the seat 40 to close it.

  The small amount of fuel flowing through at least one

  passage 56, 58 or 60 creates only a slight drop in pressure

  insufficient sion to move the shutter member 42 against the force developed by the closing spring 54, out of the cylindrical bore 36 in order to release the seat 40. When the shutter member 24 is closed, at least one passages 56, 58, 60 is crossed by all the fuel

  charged by the fuel transfer unit 14 to the

internal combustion 18.

  During the operation of the transfer unit

  14, the quantity of fuel delivered by this unit increases

  and finally the flow reaches a level such that a fraction of the flow can be diverted to operate the jet pump 30 without thereby influencing the operation of the internal combustion engine 18. If the pressure drop caused by the fuel passing through at at least one passage 56, 58 or 60 is sufficient to overcome the preload of the closing spring 54, the closure member 42 lifts from its seat 40 and the fuel can pass to the side

  of the pressure of the transfer unit 14 through the con-

  branch line 26 to the jet pump 30. The dimension

  sion of at least one passage 56, 58, 60 and the preload of the shutter spring 54 are granted within a relatively large tolerance range so that the shutter member 42 is lifted from the seat 40 when the quantity of fuel delivered by the transfer unit 14 is sufficient to guarantee correct operation of the internal combustion engine 18 even if a quantity of fuel is taken to operate the jet pump

  30. When the stop valve 24 is opened, the valve member

  turation 42 comes out of the hole 36 and is now only

  in the guide segment 48. The shutter member 42 li-

  bere thus an additional passage for fuel

  lying to the internal combustion engine 18, this additional passage being formed by the intermediate volumes

52 between the ribs 50.

  Figure 4 shows a variant of the valve

  stop 124; this valve has practically the same consistency

  truction than that described above and the description

  made below will be limited to the variants of the characteristics

  ques. The stop valve 124 according to the variant has the same references as the above valve for identical parts. In place of guide segment 48, the housing

  134 of the valve has a segment 148 of cylindrical drilling

  larger diameter than the cylinder bore

  drique 36. At the opening of the shut-off valve 124, the closure member 42 opens out from the cylindrical bore 36

  and frees up an additional passage for fuel

  lying the internal combustion engine 18; this passage above

  is the annular volume 152 which then exists

  between the periphery of the shutter member 42 and the segment

  cylindrical drilling 148. The operation of the stop valve 124 according to the variant is the same as that

described above.

  It is also possible to produce the stop valve 24 to have a continuous cylindrical bore 36 and

  to have at least one passage 56, 58, 60 even when the sou-

  stop valve 24 is open, that is to say when the closure member 42 is lifted from the seat 40, constituting the only connection between the pressure side of the fuel transfer unit 14 and the internal combustion engine 18.

  The realization of the shut-off valve 24, 124

  above guarantees the functioning of the device

  when the fuel transfer unit 14 delivers the fuel

  before starting the internal combustion engine

  dull 18 by establishing a pressure in the pressure line 16. However, the pressure line 16 is then crossed by no fuel or only by a small amount of fuel, so that the stop valve 24 or 124 remains closed until the transfer unit

  enough fuel is supplied.

Claims (5)

R E V E N D I C A T I 0 N S   1) Fuel transfer device from a   power supply to the internal combustion engine   of a motor vehicle, comprising a rete-   bare (12) placed in the supply tank (10), a fuel transfer unit (14) sucking the fuel   in the holding tank (12) and whose pressure side   is connected to the internal combustion engine (18), a bypass line (26) whose communication with the pressure side of the fuel transfer unit (14) is controlled by a shut-off valve (24, 124 ) as well as a jet pump (30) connected to the bypass line   (26) which supplies fuel to the holding tank (12)   the shut-off valve (24, 124) having a shut-off member   ration (42) loaded by a spring and cooperating with a   seat (40) associated with the bypass line (26), available   sitive characterized in that the closure member (42) of the connection (16) between the pressure side of the   fuel transfer (14) and the combustion engine   dull (18) opens in the direction of transfer to the internal combustion engine (18) and the shut-off valve (24, 124) has at least one passage (56, 58, 60) which, when   the closing valve (24, 124) is closed, the only   munication between the pressure side of the transfer unit   fuel fert (14) and the internal combustion engine,   this passage constituting a choke point for the car-   fuel supplying the internal combustion engine (18).   2) Device according to claim 1, character-   laughed at in that the obturation member comprises at least one passage (56, 58).   3) Device according to claim 1, character-   risé in that the shutter member (42) is sliding in a bore (36) and at least one passage is formed by   an extension (60) of the bore (36).   4) Device according to any one of the res-   dications 1 to 3, characterized in that the sealing member   tion (42), when the closing valve (24, 124) is open, controls in the direction of opening an additional passage (52, 152) connecting the pressure side of   the fuel transfer unit (14) to the combustion engine internal tion (18).    ) Device according to claim 4, characterized in that the shut-off valve (124) comprises a housing (134) with a stepped cylindrical bore (36, 148), the shutter member (40), when the shut-off valve (124) is   closed, located in the segment (36) of the cylindrical bore   drique of small diameter and when the stop valve (124) and open, it is in the segment (148) of the   large diameter cylindrical bore, and between the periphery   risk of the shutter member (42) and the segment (148) of the   large diameter cylindrical bore, there is an an-   ring (152) forming an additional passage.   6) Device according to claim 4, character-   risé in that the stop valve (24) comprises at least one body (34) provided with a cylindrical bore (36) in which the closure member (48) is guided in sliding, this cylindrical bore (36 ) continuing with a guide segment (48) for the shutter member (42), this segment of   guide corresponding to an increased section (52) compared to   port to that of the cylindrical bore (36) and the ob-   valve (42), when the closing valve (24) is closed, plunges into the cylindrical bore (36) and when the stop valve (24) is open, the closure member is only in the segment guide (48) and in that between the periphery of the shutter member (42) and the   guide segment (48), there is an intermediate volume   diary (52) which constitutes the additional passage.