JP2017190692A - Fuel supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel supply device including a Wesco pump which has an impeller stored in a pump chamber inside a pump case and a brushless motor which has a rotor having a cylindrical magnetic pole member joined coaxially to a rotary shaft and a stator encircling the rotor, the Wesco pump and the brushless motor being stored in a cylindrical housing in the state in which one end of the rotary shaft is connected to the impeller in a relatively non-rotatable manner, and a passage formed between the outer periphery of the stator and the inner periphery of the housing to distribute fuel delivered from the Wesco pump, for actualizing smooth flow of the fuel from the Wesco pump to a passage of the brushless motor.SOLUTION: A fuel delivery port 33 provided in a pump case 11 so as to deliver fuel to the side of a brushless motor 6 is formed so that an end opening to the side of the brushless motor 6 is located at a position deviating from an end of the fuel delivery port 33 opening to a pump chamber 10 in the rotating direction of an impeller 9. In a region for fuel delivery from the fuel delivery port 33, a passage 41 is arranged.SELECTED DRAWING: Figure 1

Description

  The present invention includes a Wesco pump in which an impeller is accommodated in a pump chamber in a pump case, a rotor in which a cylindrical magnetic pole member is coaxially coupled to a rotating shaft, and a brushless motor having a stator surrounding the rotor. One end of the rotating shaft is connected to the impeller so as not to rotate relative to the impeller, and is accommodated in a cylindrical housing, and fuel sent from the Wesco pump is circulated between the outer periphery of the stator and the inner periphery of the housing. The present invention relates to a fuel supply device in which a passage is formed.

  A Wesco pump and a brushless motor that drives the Wesco pump are accommodated in a cylindrical housing, and a passage for guiding fuel led out of the Wesco pump is formed between the outer periphery of the stator of the brushless motor and the inner periphery of the housing. A fuel supply apparatus configured as described above is known from Patent Document 1.

JP-A-2015-83828

  In the fuel supply device disclosed in Patent Document 1, a fuel lead-out port extending in parallel with the rotational axis of the brushless motor is formed in the pump case of the Wesco pump, and the fuel path from the Wesco pump to the brushless motor passage is cranked. There is room for reconsideration of specifications when the flow from the Wesco pump to the brushless motor passage is not smooth and it is desired to reduce pump noise.

  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 smooth the flow of fuel from a Wesco pump to a passage of a brushless motor.

  To achieve the above object, the present invention surrounds a Wesco pump in which an impeller is accommodated in a pump chamber in a pump case, a rotor in which a cylindrical magnetic pole member is coaxially coupled to a rotating shaft, and the rotor. A brushless motor having a stator is housed in a cylindrical housing with one end portion of the rotating shaft connected to the impeller so as not to rotate relative to the impeller, and is disposed between the outer periphery of the stator and the inner periphery of the housing. In the fuel supply device in which a passage for distributing the fuel delivered from the fuel supply device is formed, a fuel outlet port provided in the pump case so as to lead the fuel to the brushless motor side is connected to the pump chamber of the fuel outlet port. The opening end to the brushless motor side is located at a position shifted from the opening end of the impeller in the rotation direction of the impeller. It is formed, the first, wherein said that the passage is disposed in the fuel outlet region from the fuel outlet port.

  According to the present invention, in addition to the configuration of the first feature, a stator core that constitutes a part of the stator is arranged radially with respect to the annular yoke portion and the axis of the rotation shaft. A direction along the axis of the rotating shaft at a plurality of locations corresponding to the teeth portions on the outer periphery of the annular yoke portion. A groove extending in the direction from the fuel outlet port, and the direction of fuel extraction from the fuel outlet port is relative to the circumferential direction of the brushless motor and the Wesco pump so that at least one specific groove among the plurality of grooves is oriented. A second feature is that the position is determined and the passage is formed by the specific groove and the inner periphery of the housing.

  According to the present invention, in addition to the configuration of the second feature, a guide groove for guiding fuel to the passage side is formed on an outer surface of the pump case facing the brushless motor side, and an opening end of the fuel lead-out port on the brushless motor side A third feature is that the second layer is formed continuously.

  According to the present invention, in addition to the configuration of the third feature, at least one of a resin bobbin attached to the stator core and a resin covering portion covering an end portion of the bobbin on the Wesco pump side is provided with the specific A fourth feature is that a rectifying portion for guiding fuel to the concave groove side is formed to face the guide groove.

  Furthermore, in addition to any one of the configurations of the first to fourth features, the present invention provides a housing on the outside of an engine body and a fuel tank mounted on a body frame of a motorcycle driven by an internal combustion engine. A fifth feature is that the passage is provided on the opposite side of the engine body with respect to the axis of the rotation shaft.

  In addition, the 2nd channel | path 41 of embodiment respond | corresponds to the channel | path of this invention, and the 1st coating | coated part 22 of embodiment corresponds to the coating | coated part of this invention.

  According to the first feature of the present invention, the fuel lead-out port provided in the pump case is formed so as to open to the brushless motor side at a position shifted in the rotation direction of the impeller from the opening end to the pump chamber. The passage formed between the outer circumference of the stator and the inner circumference of the housing is arranged in the fuel lead-out region from the fuel lead-out port, so that the fuel flow from the Wesco pump to the brushless motor is smooth and self-generated by the fuel flow Noise can be suppressed and a quiet fuel supply device can be obtained.

  According to the second feature of the present invention, at least one specific recess among the recesses formed at a plurality of locations corresponding to the teeth portion on the outer periphery of the annular yoke portion in the stator core and extending in the direction along the axis of the rotation shaft. A passage is formed by the groove and the inner periphery of the housing, and the fuel lead-out direction from the fuel lead-out port is directed to a specific concave groove, so that the fuel led out from the fuel lead-out port is smoothly guided to the passage side. In addition, a passage can be formed between the stator core and the housing while avoiding an increase in the diameter of the housing.

  According to the third feature of the present invention, the guide groove connected to the opening end of the fuel lead-out port on the brushless motor side is formed on the outer surface of the pump case on the brushless motor side so as to guide the fuel to the passage side. The fuel led out from the fuel lead-out port is smoothly guided to the passage side.

  According to the fourth feature of the present invention, at least one of the resin bobbin attached to the stator core and the resin cover portion covering the end of the bobbin on the Wesco pump side, fuel is supplied to the specific concave groove side. Since the rectification | straightening part to guide is formed facing a guide groove, a fuel flows smoothly from a guide groove to the specific concave groove side.

  Further, according to the fifth feature of the present invention, the housing is arranged so as to have a passage on the opposite side to the engine body with respect to the axis of the rotation shaft, so that radiant heat from the engine body side is applied to the fuel flowing through the passage. It is possible to prevent the fuel from flowing and to suppress the boiling and vaporization of the fuel flowing through the passage.

It is a longitudinal cross-sectional view of a fuel supply apparatus. FIG. 2 is a sectional view taken along line 2-2 of FIG. It is the front view which looked at the inner side case half of the pump case from the 3-3 arrow direction of FIG. It is a perspective view which shows a part of brushless motor and a Wesco pump in the state (a) without a coating | coated part, and the state (b) with a coating | coated part. 1 is a side view of a motorcycle.

  The embodiment of the present invention will be described with reference to FIGS. 1 to 5 attached herewith. First, in FIG. 1, the fuel supply device 4 includes a Wesco pump 5 and a brushless motor 6 that drives the Wesco pump 5. It is housed and coupled in a common housing 7 which is a hollow cylindrical shape.

  The Wesco pump 5 has an impeller 9 having a large number of radial grooves 8 on the outer periphery, and a pump chamber 10 extending in an arc shape so as to face the outer periphery of the impeller 9, and the impeller 9 is rotatably accommodated. A pump case 11 is provided. The pump case 11 is divided into an outer case half 12 and an inner case half 13, and the impeller 9 is interposed between the outer case half 12 and the inner case half 13 and the pump. A chamber 10 is defined.

  The pump case 11 includes a first annular step 7a formed on the inner surface of the housing 7 facing outward in the axial direction, and a first caulking portion 7b formed at one end of the housing 7. It is accommodated in one end of the housing 7 so as to be sandwiched.

  The brushless motor 6 includes a stator 18 composed of a stator core 15 and a coil 16 wound around the stator core 15 via a bobbin 17, and a rotor 19 disposed in the stator 18.

  Referring also to FIG. 2, the stator core 15 is formed by joining a plurality of magnetic steel plates 14 (see FIG. 1) in a laminated state, and includes an annular yoke portion 15 a and a rotating shaft of the rotor 19. A plurality of, for example, six substantially T-shaped teeth portions 15b arranged radially at the center of 28 axes and continuously provided at a plurality of positions spaced at equal intervals in the circumferential direction of the inner periphery of the annular yoke portion 15a; Concave grooves 20 extending in the direction along the axis of the rotary shaft 28 are formed at a plurality of locations corresponding to the teeth portion 15b on the outer periphery of the annular yoke portion 15a.

  At least one set of the coils 16 divided into three phases (U phase, V phase, W phase) is wound around the stator core 15 via a bobbin 17, and the coil 16 includes the teeth portion. The winding portions 16a corresponding to 15b are provided, and the number of windings of a plurality of, for example, six winding portions 16a is set to be the same.

  Three connection terminals 21 are connected to the coil 16, and these connection terminals 21 are inserted into the bobbin 17 and supported. Further, the end portion of the bobbin 17 on the side of the Wesco pump 5 in the stator 18 is covered with a first covering portion 22 made of resin, and the end portion of the bobbin 17 opposite to the Wesco pump 5 is made of resin. It is covered with a second covering portion 23, and the second covering portion 23 is covered with a third covering portion 24 made of resin.

  The second covering portion 23 is integrally formed with three terminal covering portions 23 a that respectively cover a part of the protruding portion of the connection terminal 21 from the bobbin 17, and is opposite to the bobbin 17 of the connection terminal 21. The end on the side protrudes from the terminal covering portion 23a. Further, the third covering portion 24 is integrally formed with a plurality of contact leg portions 24a that contact the second covering portion 23 and is formed separately from the second covering portion 23. In the covering portion 24, three fitting holes 25 for fitting the terminal covering portions 23 a of the second covering portion 23 are respectively provided, and the end portion of the connection terminal 21 opposite to the bobbin 17 is third. It is provided so as to protrude from the covering portion 24 to the outside.

  The brushless motor 6 includes the second covering portion 23 on a second annular step portion 7c formed on the inner periphery of the housing 7 so as to be flush with the end surface of the stator core 15 opposite to the Wesco pump 5. Inserted into the housing 7 from the opposite side to the Wesco pump 5 so as to abut, and engages a second caulking portion 7d formed at the other end of the housing 7 with the third covering portion 24. As a result, the brushless motor 6 is built in the housing 7.

  The rotor 19 is formed by coaxially molding a rotary shaft 28 on a cylindrical magnetic pole member 27 by injection molding of a mixed material of resin and magnetic powder.

  One end of the rotary shaft 28 is inserted into the pump case 11 with a first sliding bearing 29 interposed between the rotary shaft 28 and the pump case 11. The impeller 9 is connected to the rotary shaft 28 in the pump case 11 so as not to be relatively rotatable. In this embodiment, a non-circular mounting hole 30 is provided at the center of the impeller 9, A non-circular portion 28 a having a cross-sectional shape corresponding to the cross-sectional shape of the mounting hole 30 is provided at one end portion of the rotary shaft 28 at a portion corresponding to the impeller 9. By inserting the non-circular portion 28a into the mounting hole 30, the impeller 9 is connected to the rotary shaft 28 so as not to rotate relative to the rotary shaft 28 with a play that allows a slight inclination of the rotary shaft 28. The outer case half 12 and the inner case half 13 of the pump case 11 are prevented from moving along the axial direction of the impeller 9.

  The inner case half 13 of the pump case 11 is integrally provided with a cylindrical bearing housing 13a that coaxially surrounds the rotary shaft 28, and between the bearing housing 13a and the rotary shaft 28, the One sliding bearing 29 is interposed. The other end of the rotary shaft 28 is rotatably supported by the second covering portion 23 via a second sliding bearing 31.

  The outer case half 12 in the pump case 11 is provided with a suction port 32 that communicates with one circumferential end of the pump chamber 10, and the inner case half 13 has the other circumferential end of the pump chamber 10. A fuel outlet port 33 that leads to the portion and leads fuel to the brushless motor 6 side is provided. In addition, a cylindrical suction pipe 12a that directly communicates with the suction port 32 is integrally provided on the outer case half body 12 so as to project outward, and bubbles generated by the pump action in the pump case 11 are formed. A deaeration hole (not shown) for discharging the gas is formed.

  A first passage 35 leading to the fuel outlet port 33 is formed between the rotor 19 and the stator 18 in the brushless motor 6, and the second covering portion 23 leads to the first passage 35. However, a plurality of passage holes 36 arranged around the second sliding bearing 31 are provided, and a fuel outlet chamber 37 communicating with the passage hole 36 is provided between the second and third covering portions 23 and 24. It is formed. In addition, a cylindrical discharge pipe 24b for discharging high-pressure fuel when the pump is operated is integrally protruded from the third covering portion 24, and the discharge pipe 24b is connected to the discharge pipe from the fuel outlet chamber 37. A check valve 39 for preventing backflow that allows the flow of fuel is accommodated only toward the fuel discharge port 38 at the tip of 24b.

  Referring also to FIG. 3, the fuel outlet port 33 provided in the inner case half 13 of the pump case 11 is connected to the impeller 9 from an opening end 33 a of the fuel outlet port 33 to the pump chamber 10. It is formed so that the opening end 33b toward the brushless motor 6 is located at a position shifted in the rotational direction 40. A second passage 41 is formed between the outer periphery of the stator 18 and the inner periphery of the housing 7 to allow the fuel delivered from the fuel outlet port 33 of the Westco pump 5 to flow.

  The second passage 41 is disposed in a fuel lead area A (see FIG. 2) from the fuel lead port 33. That is, on the outer surface of the pump case 11 facing the brushless motor 6 side of the inner case half 13, the guide groove 42 connected to the opening end of the fuel outlet port 33 on the brushless motor 6 side is the axis of the rotary shaft 28. The fuel lead-out area A is defined corresponding to the fuel lead-out direction led out from the opening end 33b to the brushless motor 6 through the guide groove 42, The second passage 41 is arranged in such a fuel lead-out region A.

  By the way, the concave grooves 20 extending in the direction along the axis of the rotary shaft 28 are provided at a plurality of locations (six locations in this embodiment) corresponding to the teeth 15b on the outer periphery of the stator core 15 constituting a part of the stator 18. And at least one specific concave groove 20 among the concave grooves 20, in this embodiment, two concave grooves 20 in the fuel lead-out region A, and an inner periphery of the housing 7. Second passages 41 are formed, and the fuel from the fuel outlet port 33 is guided to the second passages 41 by the guide grooves 42.

  An end of the second passage 41 opposite to the Wesco pump 5 is formed between the outer periphery of the second covering portion 23 and the inner periphery of the housing 7 at a portion corresponding to the second passage 41. The communication port 43 communicates with the fuel outlet chamber 37. That is, the fuel flowing through the first and second passages 35 and 41 merges in the fuel outlet chamber 37 and flows to the check valve 39 side.

  At least one of the resin bobbin 17 attached to the stator core 15 and the resin first covering portion 22 covering the end portion of the bobbin 17 on the Wesco pump 5 side has the specific groove 20 side. A rectifying portion 44 for guiding the fuel is formed to face the guide groove 42. In this embodiment, the fuel lead-out port 33 is formed in the inner case half 13 of the pump case 11 as a circular arc centering on the axis of the rotary shaft 28 while continuing to the open end of the fuel lead-out port 33 on the brushless motor 6 side. As shown in FIG. 4A, the guide groove 42 is disposed so as to face the end portion of the bobbin 17 on the Wesco pump 5 side while constituting the fuel lead-out region A. On the outer periphery of the first covering portion 22 corresponding to the fuel lead-out direction 46 from the fuel 42, as shown in FIG. 4B, fuel is respectively supplied to the two specific concave grooves 20 in the fuel lead-out region A. Two guiding rectifiers 44 are formed. In addition, the rectifying unit 44 can smoothly change the direction of the fuel from the fuel guiding region A in the longitudinal direction of the specific groove 20 (the direction along the axis of the rotary shaft 28). The guide surface 44a is inclined so as to approach the specific concave groove 20 as it proceeds in the lead-out direction 46 and faces the fuel lead-out direction 46 on one side, while flowing so as to fit the specific concave groove 20. It is formed in a funnel shape that narrows the road area.

  Of the six concave grooves 20, the end of the remaining concave groove 20 excluding the two specific concave grooves 20 on the side of the Wesco pump 5 is closed by a first covering portion 22, and the residual grooves 20 The fuel does not flow through the recessed groove 20.

  Further, the circumferential relative positions of the brushless motor 6 and the Wesco pump 5 are determined so that the fuel lead-out direction 46 from the fuel lead-out port 33 is directed to the specific concave groove 20. Then, the positioning projection 7e integrally projected on the inner surface of the housing 7 is fitted into the key groove 45 formed on the outer surface of the pump case 11 and the outer surface of the first covering portion 22, thereby The circumferential relative positions of the brushless motor 6 and the Wesco pump 5 are determined.

  In FIG. 5, the body frame F of the motorcycle V is mounted with an internal combustion engine E that exerts power for driving the rear wheels WR, and a passenger seat 47 disposed above the internal combustion engine E can be opened and closed. And a fuel tank 48 covered from above with the riding seat 47 is supported by the rear portion of the vehicle body frame F. The intake device 50 connected to the engine main body 49 of the internal combustion engine E has a throttle body 51 constituting a part thereof and extends rearward from the engine main body 49.

  The housing 7 of the fuel supply device 4 according to the present invention has the second passage 41 outside the engine body 49 and the fuel tank 48 on the opposite side of the engine body 49 with respect to the axis of the rotary shaft 28. In this embodiment, the housing 7 is supported by the throttle body 51 above the engine main body 49, and the first housing is supported by the throttle body 51. Two passages 41 are arranged in the upper part of the housing 7.

  Next, the operation of this embodiment will be described. The fuel outlet port 33 provided in the inner case half 13 of the pump case 11 so as to lead the fuel to the brushless motor 6 side is the pump chamber of the fuel outlet port 33. 10 is formed so that the opening end 33b toward the brushless motor 6 is located at a position shifted in the rotation direction 40 of the impeller 9 from the opening end 33a toward the rotor 10, and in the fuel lead-out region A from the fuel lead-out port 33, Since the second passage 41 formed between the outer periphery and the inner periphery of the housing 7 is arranged, the flow of fuel from the Wesco pump 5 to the brushless motor 6 is made smooth, and the self-generated sound due to the fuel flow is suppressed and quietly generated. The fuel supply device 4 can be obtained.

  Further, a plurality of stator cores 15 constituting a part of the stator 18 are arranged radially with respect to the annular yoke portion 15a and the axis of the rotation shaft 28 at equal intervals in the circumferential direction of the inner periphery of the annular yoke portion 15a. A plurality of teeth 15b continuously provided at a location, and a groove 20 extending in a direction along the axis of the rotary shaft 28 is formed at a plurality of locations corresponding to the teeth 15b on the outer periphery of the annular yoke portion 15a. The brushless motor 6 is configured such that the fuel lead-out direction 46 from the fuel lead-out port 33 is directed to at least one specific groove 20 (two in this embodiment) among the plurality of grooves 20. Further, the circumferential relative position of the Wesco pump 5 is determined, and the second passage 41 is formed by the specific concave groove 20 and the inner periphery of the housing 7. The fuel led out from the port 33 is smoothly guided to the second passage 41 side, and the second passage 41 is formed between the stator core 15 and the housing 7 while avoiding an increase in the diameter of the housing 7. be able to.

  Further, a guide groove 42 that guides fuel to the second passage 41 side is formed on the outer surface of the pump case 11 facing the brushless motor 6 side so as to continue to the opening end 33b of the fuel lead-out port 33 on the brushless motor 6 side. The fuel led out from the fuel lead-out port 33 is smoothly led to the second passage 41 side.

  Further, at least one of the resin bobbin 17 attached to the stator core 15 and the resin first covering portion 22 covering the end portion of the bobbin 17 on the Wesco pump 5 side, in this embodiment, the first covering portion 22 is used. Further, since the rectifying portion 44 that guides the fuel to the specific groove 20 side is formed to face the guide groove 42, the fuel flows from the guide groove 42 to the specific groove 20, that is, the second passage 41 side. It will flow smoothly.

  Further, the second passage 41 is provided outside the engine body 49 and the fuel tank 48 mounted on the body frame F of the motorcycle V on the opposite side of the engine body 49 with respect to the axis of the rotary shaft 28. Since the housing 7 is disposed, it is possible to prevent the radiant heat from the engine body 49 side from reaching the fuel flowing through the second passage 41 and to suppress boiling and vaporization of the fuel flowing through the second passage 41. .

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. Is possible.

4 ... Fuel supply device 5 ... Wesco pump 6 ... Brushless motor 7 ... Housing 9 ... Impeller 10 ... Pump chamber 11 ... Pump case 15 ... Stator core 15a ... Annular yoke portion 15b ... Teeth portion 17 ... Bobbin 18 ... Stator 19 ... Rotor 20 ... Concave groove 22 ... Covering portion 27 ... Cylindrical magnetic pole member 28 ... Rotating shaft 33 ... Fuel outlet port 33a ... Open end 33b of the fuel outlet port to the pump chamber ... Open end 40 of the fuel outlet port to the brushless motor side ... Direction of rotation of the impeller 41 ... Passage 42 ... Guide groove 44 ... Rectifying part 46 ... Fuel outlet direction 48 ... Fuel tank 49 ... Engine body A ... Fuel outlet region F ... Body frame V ... Motorcycle

Claims (5)

  A rotor comprising a Wesco pump (5) in which an impeller (9) is accommodated in a pump chamber (10) in a pump case (11), and a cylindrical magnetic pole member (27) coupled coaxially to a rotating shaft (28). (19) and a brushless motor (6) having a stator (18) that surrounds the rotor (19), one end of the rotating shaft (28) is coupled to the impeller (9) in a relatively non-rotatable manner. A passage (41) is formed between the outer periphery of the stator (18) and the inner periphery of the housing (7). The passage (41) allows the fuel sent from the Wesco pump (5) to flow therethrough. In the fuel supply apparatus, the fuel lead-out port (33) provided in the pump case (11) so as to lead the fuel to the brushless motor (6) side is connected to the fuel lead-out port. 33) The opening end (33b) toward the brushless motor (6) is located at a position shifted from the opening end (33a) to the pump chamber (10) in the rotational direction (40) of the impeller (9). The fuel supply device is characterized in that the passage (41) is arranged in the fuel lead-out region (A) from the fuel lead-out port (33).   A stator core (15) that constitutes a part of the stator (18) is arranged radially with respect to the annular yoke portion (15a) and the axis of the rotating shaft (28), and the inside of the annular yoke portion (15a). A plurality of locations corresponding to the teeth portion (15b) on the outer periphery of the annular yoke portion (15a), comprising a plurality of teeth portions (15b) provided continuously at a plurality of locations spaced equally in the circumferential direction of the circumference. A concave groove (20) extending in the direction along the axis of the rotary shaft (28) is formed in the fuel outlet direction (46) from the fuel outlet port (33). The circumferential relative positions of the brushless motor (6) and the Wesco pump (5) are determined so as to be directed to at least one specific concave groove (20), and the specific concave groove (20) and the housing (7 The fuel supply apparatus according to claim 1, in the inner circumference and the characterized in that said passage (41) is formed.   A guide groove (42) for guiding fuel to the passage (41) side is formed on an outer surface of the pump case (11) facing the brushless motor (6), and the brushless motor (6) of the fuel outlet port (33). The fuel supply device according to claim 2, wherein the fuel supply device is formed continuously to the opening end (33 b) on the side.   At least one of the resin bobbin (17) to be attached to the stator core (15) and the resin cover (22) covering the end of the bobbin (17) on the Wesco pump (5) side is the specified 4. The fuel supply device according to claim 3, wherein a rectifying portion (44) that guides fuel to the concave groove (20) side is formed to face the guide groove (42). 5.   The housing (7) is located outside the engine body (49) and the fuel tank (48) mounted on the body frame (F) of the motorcycle (V) with respect to the axis of the rotary shaft (28). The fuel supply device according to any one of claims 1 to 4, wherein the fuel supply device is disposed so as to have the passage (41) on the opposite side to (49).

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