JP6182231B1 - Fuel pump module - Google Patents

Abstract

A fuel pump module capable of omitting a special sealing mechanism when a fuel pump is wrapped with a resin molded body. A fuel pump module (13) includes a resin molded body (34) that wraps a fuel pump (21) in a range including a discharge port (33) and defines a discharge flow channel (35) that communicates with the discharge port (33), and the discharge flow channel (35). And a check valve 41 having a valve body 42 that is seated according to the pressure on the downstream side of the valve body that is larger than the upstream side of the valve body that leads to the discharge port 33. [Selection] Figure 1

Description

  The present invention relates to a fuel pump module including a fuel pump having a fuel inlet and outlet.

  Patent document 1 discloses a fuel pump module. A fuel pump is incorporated in the fuel pump module. A check valve is arranged in the discharge pipe of the fuel pump. When the operation of the fuel pump is stopped and the discharge pressure is lowered, the valve body is seated and the backflow of fuel to the fuel pump is prevented. At this time, a high pressure is maintained on the downstream side of the valve body.

JP 2009-162155 A

The discharge pipe of the fuel pump is fitted into the connecting cylinder of the resin module body. A seal member is sandwiched between the discharge pipe and the connecting cylinder. When the check valve is closed, the boundary between the discharge pipe and the connecting cylinder is exposed to high pressure downstream of the valve body. Depending on the pressure, the fuel penetrates along the boundary. Seal member to prevent leakage of fuel Komu soak.

  An object of this invention is to provide the fuel pump module which can abbreviate | omit a special sealing mechanism when enclosing a fuel pump with a resin molding.

According to the first aspect of the present invention, the fuel pump having a fuel inlet and outlet and a resin material different from the material constituting the outlet, and the fuel pump in a range including the outlet. Nde wrapped write molded, the resin molded body defining a discharge passage leading to the discharge port is disposed in said discharge passage, said discharge port communicating the valve body upstream large valve body downstream of the compared to A fuel pump module is provided that includes a check valve having a valve body seated in response to pressure.

  According to the second aspect, in addition to the configuration of the first side, the resin molded body defines the discharge flow path that communicates with the pipe while having an outer shape connected to the pipe, and includes the check valve. With a tube.

  According to the third aspect, in addition to the configuration of the first or second side surface, a labyrinth seal is disposed between the fuel pump and the resin molded body within a range including the discharge port.

  According to the fourth aspect, in addition to the configuration of the third side surface, the labyrinth seal includes a groove formed on the end surface of the fuel pump coaxially with the central axis of the discharge port.

  According to the fifth aspect, in addition to the configuration of any one of the first to fourth side surfaces, the resin molded body includes a coupler having a connection terminal connected to a conducting wire extending from the fuel pump.

  According to the sixth aspect, in addition to the configuration of any one of the first to fifth side surfaces, the resin molded body includes an attachment piece.

According to the first aspect, when the operation of the fuel pump stops and the discharge pressure decreases, the pressure increases on the downstream side of the valve body as compared to the upstream side of the valve body, and the valve body is seated. The check valve is closed. A high pressure is maintained on the downstream side of the valve body. Since the upstream side of the valve body is depressurized, the boundary between the fuel pump and the resin molded body is not exposed to high pressure. Thus immersion included only fuel along the boundary is prevented. Special sealing mechanism for preventing only write immersion of the fuel can be omitted. In addition, it is possible to select the presence or absence of a check valve without changing the structure of the fuel pump itself, realizing the common use of fuel pumps across multiple models, reducing development costs and reducing production facilities and management man-hours. Can be done.

  According to the second aspect, since the check valve is accommodated in the protruding connection pipe, the arrangement space of the check valve can be minimized.

  According to the third aspect, since the labyrinth seal is arranged, the area of the boundary between the fuel pump and the resin molded body can be increased in a limited space. The bonding force is enhanced and the sealing performance between the two is enhanced.

  According to the fourth aspect, since the groove is formed on the end surface of the fuel pump, the resin material can flow into the groove when the resin molded body is molded, and the labyrinth structure can be easily established.

  According to the fifth aspect, since the coupler is integrated with the resin molded body, the fuel pump and the connection terminal are reliably electrically connected. Miniaturization of the fuel pump module is realized in realizing such electrical connection. Manufacturing costs are reduced.

  According to the sixth aspect, since the mounting piece used for fixing to the other member is integrated with the resin molded body, a coupling mechanism such as a snap fit can be omitted in assembling the fuel pump module and the mounting piece, As a result, miniaturization of the fuel pump module is realized. The operation of assembling the attachment piece to the fuel pump is omitted, and the manufacturing cost is reduced.

1 is a vertical sectional view schematically showing an overall configuration of a fuel pump module according to an embodiment.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 schematically shows a fuel supply system 11 according to an embodiment. The fuel supply system 11 includes an injector 12, a fuel pump module 13 and a fuel tank 14. The injector 12 is inserted into the intake passage 16 of the internal combustion engine 15. A fuel pump module 13 is connected to the injector 12 through a fuel pipe 17. Fuel is supplied to the injector 12 from the fuel pump module 13 under a specified pressure. A fuel tank 14 is connected to the fuel pump module 13 through a fuel pipe 18. Fuel is stored in the fuel tank 14. The fuel pump module 13 replenishes fuel from the fuel tank 14.

  The fuel pump module 13 includes a fuel pump 21. The housing 22 of the fuel pump 21 includes a cylindrical casing 23, a first end surface member 24 coupled to one end of the casing 23, and a second end surface member 25 coupled to the other end of the casing 23. . An impeller 26 and an electric motor 27 are accommodated in the casing 23 between the first end face member 24 and the second end face member 25. The rotation shaft 28 of the impeller 26 is supported by the first end surface member 24 and the second end surface member 25 so as to be rotatable about the axis. A rotor 27 a of an electric motor 27 is coupled to the rotary shaft 28. The stator 27b is disposed around the rotor 27a. The electric motor 27 operates in response to the supply of current. The electric motor 27 causes the rotation shaft 28 to rotate. The second end face member 25 is molded from a resin material having a relatively high melting point. Examples of such a resin material include PPS resin. The first end face member 24 and the casing 23 may be formed from a metal material.

  The first end face member 24 is formed with a first connection pipe 31 that defines a suction path 29. The suction passage 29 opens to the outside at a suction port at one end. A fuel pipe 18 communicating with the fuel tank 14 is coupled to the first connection pipe 31. The other end of the suction passage 29 is connected to the impeller chamber 32. The impeller 26 is disposed in the impeller chamber 32. When the impeller 26 rotates according to the rotation of the rotating shaft 28, fuel is introduced into the impeller chamber 32 from the suction port.

  A discharge port 33 is defined in the second end face member 25. When the impeller 26 rotates, fuel is discharged from the discharge port 33. Fuel flows from the impeller chamber 32 into the discharge port 33 under a specified pressure.

  The fuel pump module 13 includes a resin molded body 34. The fuel pump 21 is wrapped in the resin molded body 34 in a range including the discharge port 33. The resin molded body 34 is molded from a resin material having a lower melting point than the first end face member 24 and the second end face member 25. Examples of such a resin material include POM resin. A discharge flow path 35 communicating with the discharge port 33 of the fuel pump 21 is defined in the resin molded body 34.

  A labyrinth seal 36 is disposed between the discharge port 33 of the fuel pump 21 and the resin molded body 34. The labyrinth seal 36 includes a groove 37 formed in the second end face member 25 of the fuel pump 21 coaxially with the central axis of the discharge port 33. The resin molded body 34 enters the groove 37.

  The resin molded body 34 has a second connecting pipe 38. The second connecting pipe 38 has an outer shape connected to the fuel pipe 17 that communicates with the injector 12. The discharge flow path 35 is partitioned in the second connection pipe 38. The discharge flow path 35 leads to the fuel pipe 17.

  The resin molded body 34 has a mounting piece 39. The attachment piece 39 defines, for example, an attachment surface that extends in one plane parallel to the axis of the rotary shaft 28. The attachment piece 39 may be widened from the bus bar of the casing 23 to the outside of the casing 23, for example.

  The fuel pump module 13 includes a check valve 41. The check valve 41 is incorporated in the second connection pipe 38. The check valve 41 includes a valve body 42 disposed in the discharge flow path 35. The valve body 42 is seated according to the pressure on the downstream side of the valve body that is larger than that on the upstream side of the valve body that leads to the discharge port 33. The valve body 42 is provided with a valve spring 44 that exerts an elastic force that presses the valve body 42 toward the valve seat 43. When the pressure on the upstream side of the valve body is larger than the pressure on the downstream side of the valve body, the valve body 42 moves away from the valve seat 43. Check valve 41 opens.

  The fuel pump module 13 includes a coupler 45. The coupler 45 is incorporated in the resin molded body 34. The resin molding 34 forms a socket 46. A connection terminal 47 projects into the socket 46. A conductive wire 48 extending from the electric motor 27 of the fuel pump 21 is connected to the connection terminal 47. A male coupler (not shown) is fitted into the socket 46. A drive current is supplied from the connection terminal 47 to the electric motor 27.

When the operation of the fuel pump 21 stops and the discharge pressure decreases, the pressure increases on the downstream side of the valve body as compared to the upstream side of the valve body, and the valve body 42 is seated. The check valve 41 is closed. A high pressure is maintained on the downstream side of the valve body 42. Since the upstream side of the valve body 42 is depressurized, the boundary between the fuel pump 21 and the resin molded body 34 is not exposed to high pressure. Thus immersion included only fuel along the boundary is prevented. Special sealing mechanism for preventing only write immersion of the fuel can be omitted. In addition, the presence or absence of the check valve 41 can be selected without changing the structure of the fuel pump 21 itself, so that the fuel pump 21 can be used in common across a plurality of models, reducing development costs and reducing production equipment and management man-hours. Reduction can be achieved.

  In the fuel pump module 13, the check valve 41 is incorporated in the second connection pipe 38 of the resin molded body 34. Since the check valve 41 is accommodated in the protruding second connection pipe 38, the arrangement space of the check valve 41 can be minimized. Space saving is realized in arranging the fuel pump module 13.

  A labyrinth seal 36 is disposed between the fuel pump 21 and the resin molded body 34 in a range including the discharge port 33. Accordingly, the area (contact area) of the boundary between the fuel pump 21 and the resin molded body 34 can be increased in a limited space, and as a result, the coupling force between the fuel pump 21 and the resin molded body 34 is enhanced. The sealing property is enhanced between the two 21 and 34. Here, a groove 37 is formed on the surface of the second end face member 25 when the labyrinth seal 36 is constructed. The resin material can flow into the groove 37 during resin molding of the resin molded body 34, and the labyrinth structure can be easily established.

  A coupler 45 is integrated with the resin molded body 34. Therefore, the fuel pump 21 and the connection terminal 47 are reliably electrically connected. In realizing such electrical connection, the fuel pump module 13 can be downsized. Manufacturing costs are reduced.

  The resin molded body 34 includes an attachment piece 39. The attachment piece 39 is formed at a time when the resin molding 34 is molded. In this way, the number of processes can be reduced in the production process of the fuel pump module 13. Manufacturing costs are reduced.

  Injection molding is used in manufacturing the fuel pump module 13. In the injection molding, a cavity that models the fuel pump module 13 is defined in a mold. The components of the fuel pump 21 and the coupler 45 are disposed in the cavity. The material of the resin molding 34 is poured into the cavity. At this time, since the melting point of the second end face member 25 is higher than the melting point of the resin molded body 34, the second end face member 25 is kept solid when the material is poured. The resin molded body 34 is formed according to the resin molding. After the molded resin 34 is molded, the components of the check valve 41 are inserted into the second connection pipe 38 and fixed by heat caulking.

  DESCRIPTION OF SYMBOLS 13 ... Fuel pump module, 17 ... Piping (fuel piping), 21 ... Fuel pump, 29 ... Suction port (suction channel), 33 ... Discharge port, 34 ... Resin molding, 35 ... Discharge channel, 36 ... Labyrinth seal, 37 ... groove, 38 ... connecting pipe (second connecting pipe), 39 ... mounting piece, 41 ... check valve, 42 ... valve element, 45 ... coupler, 47 ... connecting terminal, 48 ... lead wire.

Claims (6)

A fuel pump (21) having a fuel inlet (29) and a discharge port (33);
The discharge outlet (33) is constituted with the resin material different material constituting said is in a range including a discharge port (33) formed Nde write wrapping said fuel pump (21), communicating with the discharge port (33) A resin molded body (34) that divides the discharge flow path (35), and is disposed in the discharge flow path (35), and is larger on the downstream side of the valve body than the upstream side of the valve body that communicates with the discharge port (33). A fuel pump module comprising: a check valve (41) having a valve body (42) seated according to pressure.   The fuel pump module according to claim 1, wherein the resin molded body (34) defines the discharge flow path (35) communicating with the pipe (17) while having an outer shape connected to the pipe (17). A fuel pump module comprising a connecting pipe (38) including the check valve (41).   The fuel pump module according to claim 1 or 2, wherein a labyrinth seal (36) is disposed between the fuel pump (21) and the resin molded body (34) within a range including the discharge port (33). A fuel pump module characterized by that.   The fuel pump module according to claim 3, wherein the labyrinth seal (36) includes a groove (37) formed on an end surface of the fuel pump (21) coaxially with a central axis of the discharge port (33). A fuel pump module characterized by   The fuel pump module according to any one of claims 1 to 4, wherein the resin molded body (34) has a connection terminal (47) connected to a conducting wire (48) extending from the fuel pump (21). A fuel pump module comprising a coupler (45). The fuel pump module according to any one of claims 1 to 5, wherein the resin molded body (34) includes an attachment piece (39).

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