WO2014156862A1

WO2014156862A1 - Fuel supplying device

Info

Publication number: WO2014156862A1
Application number: PCT/JP2014/057478
Authority: WO
Inventors: 吉田　裕; 昌宏星
Original assignee: 株式会社ケーヒン
Priority date: 2013-03-29
Filing date: 2014-03-19
Publication date: 2014-10-02
Also published as: CN105190014A; CN105190014B; BR112015024397A2; JP6020917B2; JP2014196669A

Abstract

A fuel supplying device in which an electric motor and a fuel pump are housed in a pump housing having a deaeration hole, an exhaust port, and an intake port to which an intake filter is connected, and a deaeration hole space and a portion in which a vapor phase occurs are communicated inside a fuel tank by a vapor discharge channel, wherein the intake filter (41) is provided with: a bag-shaped filter medium (42); a connecting tube part (44) communicated at one end thereof with the intake port and having at the other end part thereof a lead-out port (43) opening into the filter medium (42); a flange part (45) provided to the other end part of the connecting tube part (44) and provided in connected fashion to the filter medium (42) so that at least a portion of the flange part (45) is disposed in the filter medium (42); and a protective part (46) for restricting a portion of the filter medium (42) facing the lead-out port (43) from displacing more than a predetermined amount toward the lead-out port (43), allowing the circulation of fuel to the connecting tube part (4) from inside the filter medium (42), and protruding toward the inside of the filter medium (42). By this configuration, even when the intake filter becomes clogged, sudden changes in engine behavior are prevented.

Description

Fuel supply device

The present invention relates to an electric motor and a fuel pump having a pump chamber in which a rotating member that is rotationally driven by the electric motor is accommodated, an intake port for sucking fuel into the pump chamber, and fuel from the pump chamber A suction filter that is housed and held in a pump housing having a discharge port for discharging gas and a deaeration hole for discharging vapor generated in the pump chamber, and filters the fuel in the fuel tank and supplies it to the fuel pump Is connected to the suction port, and relates to a fuel supply device in which a vapor phase portion in the fuel tank and the deaeration hole communicate with each other through a vapor discharge passage.

In a fuel supply device in which fuel in a fuel tank is boosted by a fuel pump and supplied to a fuel injection valve, a suction filter for suppressing foreign matter from entering the pump chamber and a vapor generated in the pump chamber are externally provided. It is common to provide a deaeration hole for discharging. In such a fuel supply device, when the suction filter is clogged, there is a problem that the fuel containing foreign matters is sucked into the pump chamber from the deaeration hole. However, there is a fuel supply device that solves such a problem. This is known from Patent Document 1. In this system, a return fuel filling area is provided to fill the surplus pressure returned from the regulator from the fuel discharged from the fuel pump, and the return fuel filling area is communicated with the deaeration hole. Since the fuel stored in the area is clean fuel filtered by the suction filter, when the suction filter is clogged, the fuel in the return fuel filled area is sucked into the pump chamber from the deaeration hole. Prevents foreign matter from entering the pump chamber. Also, if the fuel level in the return fuel filling area drops below a predetermined position during engine operation after the suction filter is clogged, air will be sucked into the pump chamber from the deaeration hole, causing the engine to malfunction. This makes it possible to prompt the driver to replace the suction filter.

Japanese Unexamined Patent Publication No. 2010-229996

By the way, sudden engine behavior changes such as inability to accelerate, sudden stall, engine stop, etc. may impair driver operability, and it is desirable to prevent sudden changes in engine behavior, The inventor of the present application has confirmed through experiments that the sudden change in behavior of the engine at the time of occurrence of clogging of the suction filter is caused by the structure of the conventional suction filter.

That is, in the conventional suction filter, as shown in FIG. 5, the suction filter is provided in the connecting pipe portion 44 having the outlet 43 that opens into the bag-shaped filter medium 42, and radially outward of the outlet 43.

The protrusions

56, 56,... That are arranged at a plurality of locations around the outlet port 43 are merely provided on the projecting flange portion 45. When the filter medium 42 is clogged, As indicated by the chain line in FIG. 5, the internal volume is reduced to displace the outlet 43. This state does not change during operation of the fuel pump, and the filter medium 42 does not leave the outlet 43, so that the amount of fuel drawn from the outlet 43 to the inlet of the fuel pump remains extremely low. Become. As a result, air is continuously sucked into the pump chamber from the deaeration hole, suddenly changing the behavior of the engine, and stopping the engine.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a fuel supply device that can prevent sudden changes in engine behavior even if the suction filter is clogged. To do.

In order to achieve the above object, the present invention provides an intake for causing an electric motor and a fuel pump having a pump chamber in which a rotating member driven to rotate by the electric motor is accommodated to suck fuel into the pump chamber. The fuel is stored in and held in a pump housing having a port, a discharge port for discharging fuel from the pump chamber, and a deaeration hole for discharging vapor generated in the pump chamber, and the fuel in the fuel tank is filtered In a fuel supply apparatus, wherein a suction filter for supplying to a pump is connected to the suction port, and a portion that becomes a gas phase in the fuel tank and the deaeration hole communicate with each other through a vapor discharge passage, the suction filter includes a bag And a connecting pipe portion having one end communicating with the suction port and having a lead-out port opened in the filter medium at the other end, and the lead-out port at the other end of the connecting pipe portion A flange portion provided so as to project outward in the radial direction and at least a part thereof being disposed in the filter medium, and a portion of the filter medium facing the outlet. A protective part that regulates displacement of a predetermined amount or more to the outlet side and allows fuel to flow from the inside of the filter medium to the connecting pipe part and protrudes from the flange part into the filter medium. Is the first feature.

According to the present invention, in addition to the configuration of the first feature, the protection portion is disposed on a column portion standing on the flange portion, and on a plane parallel to the flange portion that is connected to the column portion. The second feature is that it comprises a flat plate portion.

According to the present invention, in addition to the configuration of the second feature, the column portions are erected at a plurality of locations spaced in the circumferential direction of the flange portion, and the flat plate portion is continuously provided to these column portions. Is the third feature.

The present invention is characterized in that, in addition to the configuration of the second or third feature, the flat plate portion itself is formed so as to allow the fuel to flow.

The present invention is characterized in that, in addition to the configuration of the first feature, the protection portion is formed in a frame shape straddling the outlet in the filter medium.

Furthermore, in addition to any one of the first to fifth features of the present invention, a skeleton that forms the shape of the filter medium and suppresses sticking of the mutually opposing portions of the filter medium is the flange section or the It is a sixth feature that it extends from the protection part.

According to the first feature of the present invention, the connecting pipe portion, one end of which leads to the suction port, has a lead-out port that opens into the filter medium at the other end, and the flange portion provided in the connection pipe section is connected to the filter medium. And a protective portion that restricts a displacement of a predetermined amount or more to the outlet port side of the portion of the filter medium that faces the outlet port, allows fuel to flow from the inside of the filter medium to the connecting pipe portion, and protrudes from the flange portion. Therefore, even if the filter medium is clogged and the filter medium is displaced so as to reduce its internal volume, the outlet port is not completely blocked by the portion of the filter medium that faces the outlet port. The introduction of air into the air becomes intermittent. In other words, when the filter medium is clogged and the internal volume of the filter medium is reduced, the amount of fuel sucked from the fuel pump suction port decreases and air is sucked into the pump chamber from the deaeration hole. Vapor generated by the passage of the gas is sucked into the suction port from the lead-out port that is not completely closed through the connecting pipe portion, and the suction force (force to stick the filter medium) of the fuel pump is reduced. For this reason, the mutually facing portions of the filter medium are separated again, and fuel is secured between the separated filter media, so that the fuel suction amount of the fuel pump from the suction port is restored, and air is sucked into the pump chamber from the deaeration hole. Is stopped. At this time, since the distance between the outlet and the portion of the filter medium that faces the outlet is held by the protection portion, the separation of the mutually opposing portions of the filter medium is promoted. By repeatedly reducing and returning the internal volume of the filter medium, air is sucked into the pump chamber intermittently from the deaeration holes, and the behavior of the engine when the suction filter is clogged. The change will be gradual, and sudden changes in engine behavior can be suppressed.

According to the second feature of the present invention, the protective part comprises a column part standing on the flange part, and a flat plate part arranged in a plane parallel to the flange part and connected to the column part. Therefore, it is possible to suppress the displacement of the portion of the filter medium facing the outlet port toward the outlet port by the flat plate portion, and to secure a fuel passage in the filter medium leading to the outlet port between the flange portion and the flat plate portion.

According to the third feature of the present invention, the protection part is configured to connect the plurality of column parts standing at intervals in the circumferential direction of the flange part with the flat plate part, so that the strength of the protection part is ensured. can do.

According to the fourth feature of the present invention, since the flat plate portion itself is formed to allow the fuel to flow, it is possible to secure the amount of fuel sucked from the outlet to the inlet through the protection portion.

According to the fifth feature of the present invention, since the protective part has a frame shape straddling the outlet, the displacement of the portion of the filter medium facing the outlet to the outlet side can be reliably suppressed.

Furthermore, according to the sixth feature of the present invention, the skeleton part extends from the flange part or the protective part so as to form the shape of the filter medium and suppress the sticking of the mutually facing parts of the filter medium. Even when the filter medium is clogged, sticking of the mutually facing portions of the filter medium can be suppressed by the skeleton portion, and recovery from a decrease in the internal volume of the filter medium can be further promoted.

FIG. 1 is a longitudinal sectional view of a fuel supply device in a fuel tank according to a first embodiment. (First embodiment) FIG. 2 is an enlarged view of a portion indicated by an arrow 2 in FIG. (First embodiment) FIG. 3 is a perspective view in which the filter medium is omitted from the suction filter. (First embodiment) FIG. 4 is a cross-sectional view corresponding to FIG. 2 of the second embodiment. (Second Embodiment) FIG. 5 is a longitudinal sectional view showing a part of a conventional suction filter. (Conventional example)

DESCRIPTION OF SYMBOLS 5 ... Fuel tank 8 ... Electric motor 9 ... Fuel pump 10 ... Pump housing 11 ... Pump impeller 12 which is a rotating member ... Pump chamber 13 ... Inlet 14 ... Discharge port 15 ... deaeration hole 39 ... vapor discharge passage 41 ... suction filter 42 ... filter medium 43 ... outlet port 44 ... connection pipe part 45 ...

flange parts

46, 55・ Protection part 49 ... post part 50 ... flat plate part 52 ... frame part

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

First embodiment

A first embodiment of the present invention will be described with reference to FIGS. 1 to 3. First, in FIG. 1, a fuel tank 5 is mounted on a ceiling wall 5a of a fuel tank 5 mounted on a vehicle such as a motorcycle. A pump unit 7 for supplying the internal fuel to the fuel injection valve 6 of the engine is attached.

In the pump unit 7, an electric motor 8 and a fuel pump 9 having a pump chamber 12 in which a pump impeller 11, which is a rotating member that is rotationally driven by the electric motor 8, sucks fuel into the pump chamber 12. And a pump housing 10 having a suction port 13 for discharging, a discharge port 14 for discharging fuel from the pump chamber 12, and a deaeration hole 15 for discharging vapor generated in the pump chamber 12. Is.

The pump housing 10 includes a motor housing 17 of the electric motor 8 and a pump case 18 attached to the lower part of the motor housing 17. The motor housing 17 includes a cylindrical stator 19, an upper bearing bracket 20 that is rotatably supported by an upper end portion of a motor shaft 22 having an axis extending vertically and is caulked and coupled to the upper end portion of the stator 19, A lower bearing bracket 21 is rotatably supported by a lower portion of the motor shaft 22 and is caulked and coupled to a lower end portion of the stator 19. The pump case 18 includes the pump chamber 12 between the lower bearing bracket 21. It is formed and caulked to the lower end portion of the stator 19 together with the lower bearing bracket 21.

A lower end portion of the motor shaft 22 passes through the lower bearing bracket 21 to be freely rotatable and enters the pump chamber 12. A pump impeller 11 attached to the lower end portion of the motor shaft 22 is accommodated in the pump chamber 12. Thus, the fuel pump 9 is configured.

The pump case 18 of the pump housing 10 is integrally provided with a suction pipe portion 18 a that forms a suction port 13 for sucking fuel into the pump chamber 12 and protrudes downward. A deaeration hole 15 for discharging the generated vapor is provided. The fuel boosted in the pump chamber 12 flows upward in the motor housing 17, and the fuel from the pump chamber 12 is discharged to the upper bearing bracket 20 at the upper portion of the motor housing 17. The discharge pipe portion 20a that forms the discharge port 14 is integrally protruded so as to protrude upward, and a check valve 23 is disposed at the discharge port 14.

The pump housing 10 is inserted into a cylindrical casing 24, and an attachment base member 25 fastened to the ceiling wall 5 a of the fuel tank 5 is attached to the upper end portion of the casing 24. The member 25 is provided with a fitting recess 26 for fitting the discharge pipe portion 20a in a liquid-tight manner, and a plurality of

bolts

27, 27... And

nuts

28, 28. A flange portion 25a to be attached and a fuel discharge pipe 29 protruding outward are integrally provided, and the fuel discharge pipe 29 is connected to the fuel injection valve 6 through a pipe line 30 such as a fuel hose.

Further, the mounting base member 25 is formed with an outlet side flow path 32 connecting the fitting recess 26 and the fuel discharge pipe 29, and a pressure adjusting passage 33 branched from the outlet side flow path 32 is formed. The pressure adjusting passage 33 is connected to a regulator valve 34 held by the mounting base member 25 so as to adjust the pressure of the fuel flowing through the outlet side passage 32 to a predetermined pressure.

An adapter 37 is attached to a lower end portion of the casing 24 so as to cover the pump case 18 from below, and a pipe disposed on the adapter 37 so as to extend vertically on the side of the casing 24. The lower end portion of 38 is continuously provided. A part of the adapter 37 and the pipe 38 form a vapor discharge passage 39 having one end communicating with the deaeration hole 15, and the vapor discharge passage 39 communicates with the deaeration hole 15 and the adapter. 37, and a passage portion 39b formed in the passage 38 in communication with the passage portion 39a. A strainer 40 is attached to the upper end of the pipe 38.

The pipe 38 is arranged so that its upper end is located above the highest level of the liquid level L in the fuel tank 5 so as to extend vertically on the side of the casing 24, and the vapor discharge passage 39. Will communicate between the portion of the fuel tank 5 that is in the gas phase and the deaeration hole 15.

A suction pipe portion 18a which is provided integrally with the pump case 18 and forms the suction port 13 passes through the adapter 37 and protrudes downward from the adapter 37. The suction filter 41 is connected to the suction pipe portion 18a. Is connected. That is, the pump unit 7 is disposed in the fuel tank 5 so that the suction filter 41 is connected to the suction port 13 in the suction pipe portion 18 a in the fuel tank 5.

Referring to FIGS. 2 and 3 together, the suction filter 41 has a bag-shaped filter medium 42 and one end communicating with the suction port 13 and a lead-out port 43 that opens into the filter medium 42 at the other end. A connecting pipe part 44 connected to the suction pipe part 18a, and provided at the other end of the connecting pipe part 44 so as to project outward in the radial direction of the outlet port 43, and at least a part thereof. A flange 45 that is arranged in the filter medium 42 so as to be arranged in the filter medium 42, and a displacement of a part of the filter medium 42 that faces the outlet port 43 toward the outlet port 43 side by a predetermined amount or more. And a protective portion 46 that protrudes from the flange portion 45 into the filter medium 42 while allowing fuel to flow from the filter medium 42 to the connecting pipe portion 44.

The connecting pipe part 44 includes a ring plate part 47 provided at an end of the pipe member disposed outside the filter medium 42 on the filter medium 42 side, and the filter medium 42 sandwiched between the ring plate part 47 and the filter medium 42. The ring plate portion 48 inserted into the filter member 42 is connected to the filter medium 42 by being joined to each other by ultrasonic welding while sandwiching a part of the filter medium 42 therebetween, The flange portion 45 is configured by the

ring plate portions

47 and 48 so that a part thereof is disposed in the filter medium 42.

The protective part 46 includes

column parts

49, 49, 49 erected on the flange part 45, and a flat plate part 50 arranged in a plane parallel to the flange part 45 and connected to the column parts 49. Consists of.

In addition, the support column portions 49 are erected at a plurality of, for example, four locations spaced in the circumferential direction of the flange portion 45, and the flat plate portion 50 is connected to the support column portions 49.

Further, the flat plate portion 50 itself is formed so as to allow the fuel to flow. In this embodiment, a circular flow hole 51 is provided at the center of the flat plate portion 50.

Further, a skeleton part 52 that forms the shape of the filter medium 42 and suppresses the sticking of mutually opposing portions of the filter medium 42 extends from the flange part 45 or the protection part 46. The frame portion 52 includes a frame portion 53 that extends from the flange portion 45 and forms the shape of the filter medium 42, and a plurality of

protrusions

54, 54,.

Next, the operation of the first embodiment will be described. The suction filter 41 has one end communicating with the bag-shaped filter medium 42 and the suction port 13 of the fuel pump 9 and an outlet port 43 that opens into the filter medium 42. A connecting pipe portion 44 having the other end portion, and at the other end portion of the connecting pipe portion 44 so as to project outward in the radial direction of the outlet port 43, and at least a part thereof is disposed in the filter medium 42. In this way, the flange 45 connected to the filter medium 42 and the displacement of a part of the filter medium 42 opposite to the outlet 43 to the outlet 43 side are restricted by a predetermined amount and the filter medium. And a protective portion 46 that protrudes from the flange portion 45 toward the filter medium 42 while allowing fuel to flow from inside the connecting pipe portion 44. Therefore, even when the filter medium 42 is clogged and the filter medium 42 is displaced so as to reduce its internal volume, the outlet 43 is completely at the portion of the filter medium 42 facing the outlet 43 as shown by the chain line in FIG. The air is intermittently introduced from the deaeration hole 15 into the pump chamber 12. That is, when the filter medium 42 is clogged and the internal volume of the filter medium 42 is reduced, the amount of fuel sucked from the suction port 13 of the fuel pump 9 is reduced, and air is sucked into the pump chamber 12 from the deaeration hole 15. Vapor generated by the passage of fuel through the clogged filter medium 42 is sucked into the suction port 13 through the connection pipe portion 44 from the outlet port 43 that is not completely closed, and the suction input ( The force to stick the filter medium is reduced. For this reason, the mutually facing portions of the filter medium 42 are separated again, and fuel is secured between the separated filter media 42, whereby the fuel suction amount of the fuel pump 9 from the suction port 13 is restored, and the pump chamber is opened from the deaeration hole 15. Inhalation of air into 12 is stopped. At this time, since the interval between the outlet 43 and the portion of the filter medium 42 that faces the outlet 43 is held by the protection unit 46, the separation of the portions of the filter medium 42 that face each other is promoted. become. By repeatedly reducing and returning the internal volume of the filter medium 42 as described above, the suction of air from the deaeration hole 15 into the pump chamber 12 is intermittently performed, and the suction filter 41 is clogged. Changes in engine behavior at the time become gradual, and sudden changes in engine behavior can be suppressed.

In addition, the protection part 46 is provided with

column parts

49, 49... Standing on the flange part 45, and a flat plate part arranged in a plane parallel to the flange part 45 and connected to the

column parts

49, 49. 50, the flat plate portion 50 prevents the portion of the filter medium 42 facing the outlet port 43 from displacing to the outlet port 43 side, and the fuel passage in the filter medium 42 leading to the outlet port 43 is connected to the flange portion 45. And between the flat plate portions 50.

Further, the

support column portions

49, 49... Are erected at a plurality of locations spaced in the circumferential direction of the flange portion 45, and the flat plate portion 50 is continuously provided to the

support column portions

49, 49. The strength of 46 can be ensured.

Further, since the flat plate portion 50 itself is formed so as to allow the fuel to flow, it is possible to secure the amount of fuel sucked into the suction port 13 from the outlet port 43 through the protection part 46.

Furthermore, since the skeleton 52 that forms the shape of the filter medium 42 and suppresses the sticking of the mutually facing portions of the filter medium 42 is extended from the flange portion 45, the filter medium 42 can be formed even if the filter medium 42 is clogged. Sticking of mutually opposing portions can be suppressed by the skeleton portion 52, and recovery from a reduction in the internal volume of the filter medium 42 can be further promoted.

Second embodiment

The second embodiment of the present invention will be described with reference to FIG. 4. The portion of the filter medium 42 that faces the outlet 43 is restricted from being displaced by a predetermined amount or more toward the outlet 43 and the filter medium 42. A protective portion 55 that allows the fuel to flow from the inside to the connecting pipe portion 44 is projected from the flange portion 45.

The protective portion 55 is formed by combining a plurality of

frame portions

55a, 55a,... Extending from a plurality of locations spaced in the circumferential direction of the outlet port 43 and extending in an arc shape. It is formed in a frame shape straddling within the filter medium 42.

Also, a skeleton 52 that forms the shape of the filter medium 42 and suppresses the sticking of the mutually facing portions of the filter medium 42 is extended from the flange 45 as in the first embodiment.

According to the second embodiment, even when the filter medium 42 is clogged and the filter medium 42 is displaced so as to reduce its internal volume, the protective portion 55 has a frame shape that straddles the outlet port 43. Therefore, the displacement of the filter medium 42 is restricted by the protective portion 55 as indicated by the chain line, and the displacement of the portion of the filter medium 42 facing the outlet 43 toward the outlet 43 can be reliably suppressed. .

The embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the gist of the present invention.

Claims

An electric motor (8) and a fuel pump (9) having a pump chamber (12) in which a rotating member (11) rotated and driven by the electric motor (8) is accommodated are fuel in the pump chamber (12). A suction port (13) for sucking in, a discharge port (14) for discharging fuel from the pump chamber (12), and a deaeration hole (15) for discharging vapor generated in the pump chamber (12) A suction filter (41), which is received and held in a pump housing (10) having a filter, for filtering the fuel in the fuel tank (5) and supplying it to the fuel pump (9) is connected to the suction port (13). In the fuel supply device in which the portion that becomes the gas phase in the fuel tank (5) and the deaeration hole (15) communicate with each other through the vapor discharge passage (39), the suction filter (41) has a bag-like shape. A filter medium (42); A connection pipe part (44) having one end communicating with the suction port (13) and having a lead-out port (43) opening in the filter medium (42) at the other end, and the other end of the connection pipe part (44) A flange that is provided in a part so as to project outward in the radial direction of the outlet port (43) and that is at least partially disposed in the filter medium (42) and is provided continuously to the filter medium (42). A portion (45) and a portion of the filter medium (42) facing the outlet port (43) are restricted from being displaced by a predetermined amount or more toward the outlet port (43) side, and the inside of the filter medium (42) A fuel supply comprising a protective part (46, 55) protruding from the flange part (45) into the filter medium (42) while allowing the fuel to flow to the connecting pipe part (44). apparatus.
The protection part (46) is arranged on a plane that is provided on the flange part (45) and is provided in a plane parallel to the flange part (45) that is connected to the pillar part (49). The fuel supply device according to claim 1, wherein the fuel supply device comprises a flat plate portion.
The column portion (49) is erected at a plurality of locations spaced in the circumferential direction of the flange portion (45), and the flat plate portion (50) is connected to the column portion (49). The fuel supply device according to claim 2.
The fuel supply device according to claim 2 or 3, wherein the flat plate portion (50) is formed so as to allow the fuel to flow.
The fuel supply device according to claim 1, wherein the protection part (55) is formed in a frame shape straddling the outlet port (43) within the filter medium (42).
A skeleton part (52) that forms the shape of the filter medium (42) and suppresses the sticking of mutually opposing parts of the filter medium (42) extends from the flange part (45) or the protective part (46, 55). The fuel supply apparatus according to any one of claims 1 to 5, wherein the fuel supply apparatus is provided.