FR2748782A1 - FUEL PUMP MODULE WITH FINE FILTER, INTEGRATED - Google Patents

Abstract

Fuel pump module comprising a fuel pump, a coarse filter and a fine filter for fuel, the pump and its coarse filter mounted downstream being surrounded by a tank-tank provided at the bottom of the fuel tank. The wall (31, 32) of the tank-reservoir (30) is at least in the form of a double wall by zones. In the gap (52) completely surrounded by the wall (31, 32) is the fine fuel filter (22), the gap (52) having on the one hand, in the inlet zone of the fine filter, a supply nozzle (62) connected to the pressure connection of the fuel pump (10) and on the other hand, in the outlet zone of the fine filter, an outlet nozzle (63).

Description

State of the art

  The invention relates to a fuel pump module.

  rant including a fuel pump, a coarse filter and

  a fine filter for fuel, the pump and its large filter

  sier mounted upstream being surrounded by a tank-tank

  provided at the bottom of the fuel tank.

  In some motor vehicles we use

  fuel pumps housed inside the tank.

  To guarantee the supply of pumps in general placed

  on the bottom of the tank, when the tank is already

  partially emptied, and the vehicle describes a turn and / or

  runs on a slope, the pump is placed in a tank

  reservoir which maintains the liquid level in the immediate vicinity

  pump medium, at a predetermined level. The tank

  view is for example filled from the outside, from the bottom of a drawer, by a suction jet pump. The agent

  drive is the return fuel from the engine. The bus-

  burant back can also arrive directly in the

tank tank.

  Generally on its way to the engine, the fuel passes through two different fuel filters. The first coarse pore filter is on the side of

  the suction of the fuel pump integrated in the tank

  to serve. The second fine pore filter is downstream of the pump and is located outside the fuel tank

  (see Jrgen Kasedorf; Benzineinspritzung und Katalysator-

  technik; Vogel Buchverlag; 1st edition, 1995; pages 115 and 116). Advantages of the invention

  The invention relates to a pump of the type defined above.

  above characterized in that: - the wall (31, 32) of the tank (30) is at least in the form of a double wall by zones and, - in the interval (52) completely surrounded by the wall (31, 32) is the fine fuel filter (22), the gap (52) having on the one hand, in the inlet zone of the fine filter, a supply nozzle (62) connected to the pressure connection of the fuel pump (10) and

  on the other hand, in the outlet area of the fine filter, an

output stage (63).

  The fine fuel filter is integrated into the pump module. The tank is double walled at least in zones, on the height and the periphery. The gap completely surrounded by the double wall receives the fine filter at

  fuel. Thus, the fuel pump is downstream of this wire-

  be. The movement of the fine fuel filter in the

  tank-tank allows the economy of the manufacture of a box

  separate tier for fine filter and screw connections. This also eliminates the separate mounting of the fine filter housing on the vehicle body. In addition, the number of hydraulic connections and points outside the tank is reduced, which reduces the risk of fuel leakage. In addition, the tank, the dimensions of which

  are larger than those of a wire box-

  being the usual fine, receives a fine filter whose filter surface is considerably increased. This increases the life of the fine filter so that such a fine filter is sufficient for the

  average life of a vehicle.

  The fuel pumping module according to the invention thus reduces the cost of parts, assembly, and

  saves space outside the tank

see fuel.

  According to other advantageous features of the invention, the fuel pump module can be formed

  compared to the tank, the fine filter and the suspension

  as well as the blocking of the fuel pump, and in particular

  ment: - the walls of the tank are at least coaxial in zones, - the tank does not have a clean bottom made directly on the tank by molding, - in the immediate vicinity of the tank is a suitable support at least in zones with the external contour of the fuel pump and partially surrounding it,

  this support being suspended elastically in the tank-

  tank, - the tank-tank and the support of the fuel pump as well as its elastic suspension elements, are in one piece, - the fuel pump is hung in the support by means of a connection plug carried by the pressure end of the pump, - at least two hooking nozzles are provided in the lower zone of the tank-tank for blocking at the bottom of the

fuel tank.

Drawings

  The present invention will be described below in more detail using an embodiment

  shown schematically in the accompanying drawings in the-

  which: - Figure 1 is a sectional view of a fuel pump module whose tank has been cut,

  - Figure 2 is a top view of a suspension element

if we.

  Description of the exemplary embodiment

  The fuel pump module according to Figure 1 consists of a tank 30 placed on the bottom 1 of a fuel tank; this tank tank incorporates an electric fuel pump 10 and two fuel filters 21, 22. The electric pump 10 draws fuel from the volume

  inside 51, 53 of the tank 30 by a coarse filter

  sier 21 and transfers it through a fine fuel filter 22 into a fuel line supplying the combustion engine

internal.

  The tank-reservoir 30 is in principle a tubular part, for example made of plastic, resistant to fuel. Its upper part includes a cylindrical outer wall 31 and a concentric inner wall 32. The

  outer wall and the inner wall are connected in my-

  fuel-tight by a bottom 33 and a cover

  filter housing 61. These four parts define a chamber

fine filter bre 52.

  The cover 61 of the filter housing is fixed to the exterior wall 31 and to the interior 32, for example of

  joined together by gluing or ultrasonic welding.

  The cover comes to take by its edges the two walls 31, 32. In the space 52 between the walls 31, 32 is the

fine fuel filter 22.

  The fine filter 22 is for example a surface filter folded in a star and having an average pore size

  of 10 ym. Its front faces are delimited by capu-

  chons 23, 24 which separate the entry side from the exit side. The caps 23, 24 have a lateral play of several tens of

  millimeters in chamber 52 of the fine filter.

  The fine filter 22 rests on the bottom 33 by its lower cap 24. The upper cap 23 is supported by an elastic seal 64 against the cover 61 of the filter housing. If necessary, a seal can also be integrated at the bottom. The upper seal 64 is mounted eccentrically by

  compared to the fine filter 22, in the cover 61 of the housing.

  In the interval between the seal 64 and the outer wall 31, the cover 61 of the filter housing has a nozzle 62 formed on the cover. In the gap between the seal 64 and the inner wall 32, there is an outlet nozzle 63. The inner wall 32 has a support 40 by

  at least two suspension elements 35.

  In the exemplary embodiment, there are three suspension elements

  sion 35. The support 40 receives the electric fuel pump 10. For this, the support 40 is at least pot-shaped, by zones. In its lower part, it has a rim 41 and in the view according to FIG. 1 on the left side, there is an arm 42 stiffened by a rib 43 and having at least one snap-in spout 44. The rim 41 receives the pump electric 10 engaged from above in the support 40. The snap-fit spout 44 of the arm 42 enters one of the cavities

  latching 16 provided on the pressure connection nozzle

  sion 13. The connection end piece 13 is mounted, by a seal 17, in a sealed manner on the end piece 11 of the electric pump 10. The snap-in cavities 16 are provided in an arm 14 facing the pump . Next to the cavities

  latching 16, the arm 14 comprises an elastic angle 15 which forms with the arm 14 a guide means and a latching block for the arm 42 of the support 40. The cor-

  15 can be in the form of a double angle and a stirrup completely surrounding the arm 42 at the level of the cavities

  16. Thus, the engagement of the press end

  sion 13 blocks the electric pump 10 in the support 40.

  The pressure end piece 13 is hydraulically connected to the feed nozzle 62 of the cover 61 of the housing.

  filter by a flexible pipe not shown.

  One of the suspension elements 35 which elastically receives the support 40 in the interior wall 32, is shown in FIG. 2. This suspension element 35 is

  consists of two stirrups 36, 37 opposite, each having sensi-

  definitely a U-shape. One leg of the stirrup is connected to the support 40 and the other to the inner wall 32, or is formed thereon. The attachment points of the two stirrups 36, 37 are brought together. The stirrups 36, 37 function as bending springs when the support 40 either directly approaches the interior wall 32 or swings slightly relative to the interior wall 32. These elements also act as torsion springs when the support 40 or the electric pump 10 performs an oscillating movement around its longitudinal axis. The suspension elements 35 have a

  sound insulation effect due to their shape.

  The broken line 39 represents a plane of

  section which shows the two suspension elements 35 at the end

gure 1.

  In the lower zone of the tank 30

  there is chamber 53 of the coarse filter. This room re-

  coarse filter 21 mounted from below on the electric pump 10. The coarse filter 21 has for example a size

pore size of about 60 im.

  To the right of the coarse filter 21, the tank

  is also made with a double wall. Between the pa-

  outer king 31 and an inner wall 45 forming a labyrinth

  the, there is a fuel supply channel 49 connecting the fuel tank to the tank-tank 30 by a suction jet pump. The outer wall 31 and the labyrinth wall 45 are tightly connected with respect to the bottom 1 of the tank, by a bottom seal 48. The bottom seal 48 is for example between an annular connection element 2 which is the case if necessary also made up of separate segments. The connection element 2 comprises at

  general two snap-in cavities 3 into which comes

  nent hang the spouts 47 carried by the tank-tank 30,

by snap hooks 46.

  Instead of hooking to the bottom 1 of the fuel tank, the tank 30 can also be pressed

  against the top wall of the tank or against a cover

  key built into the tank. It is also possible to integrate

  the connecting element 2 to a closing plate available

  tinted so that this plate forms for example with the seal 48 of the bottom 1, an assembled bottom for the tank-tank 30. The outlet nozzle 63 carried by the cover 61 of the filter housing provides for example the fuel filtered by

  a hose, to a pressure regulating valve. The bus-

  required to this location is returned if necessary back to drive the jet suction pump fitted to the tank-tank 30. The pipe, the pressure regulating valve and the jet suction pump are not shown

to the figures.

R E V E N D I CATIONS

  1) Fuel pump module comprising a fuel pump

  rant, a coarse filter and a fine filter for the fuel, the pump and its coarse filter mounted upstream being surrounded by a tank-tank provided at the bottom of the fuel tank, characterized in that - the wall (31, 32 ) of the tank-reservoir (30) is at least in the form of a double wall in zones and, - in the interval (52) completely surrounded by the wall (31, 32) is the fine fuel filter (22), the interval (52) having on the one hand, in the inlet zone of the fine filter, a supply nozzle (62) connected to the pressure connection of the fuel pump (10) and

  on the other hand, in the outlet area of the fine filter, an

output stage (63).

  ) Fuel pump module according to claim 1, characterized in that the walls (31, 32) of the tank (30) are at least

coaxial by zones.

  3) Fuel pump module according to claim 1, characterized in that the tank-tank (30) does not have a clean bottom made

  directly on the tank by molding.

  4) Fuel pump module according to claim 1, characterized in that in the immediate vicinity of the tank (30) is a support (40) adapted at least by zones to the outer contour

  of the fuel pump (10) and surrounding it partially-

  ment, this support being suspended elastically in the tank

tank (30).

   ) Fuel pump module according to claim 4, characterized in that

  the tank (30) and the support (40) of the fuel pump

  burant (10) and its elastic suspension elements

(35), are in one piece.

  6) Fuel pump module according to claim 4, characterized in that the fuel pump (10) is hung in the support (40) using a connection nozzle (13) carried by the nozzle

pressure (11) of the pump.

  7) Fuel pump module according to claim 1, characterized in that at least two hooking spouts (47) are provided in the lower zone of the tank-tank (30) for blocking at the bottom

(1) of the fuel tank.