JP2005155411A - Jet pump module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a jet pump module miniaturizing size without degrading strength and performance by integrating a plurality of jet pumps, and a fuel supply device using the same. <P>SOLUTION: A transportation jet pump 40 and a suction jet pump 50 constructs an integrated jet pump module 30. A supply pipe part 60 supplying fuel to the transportation nozzle 41 and a suction nozzle 51 is arranged roughly perpendicular to a second pipe part 52 forming a suction passage 53. Since a center axis L1 of a second pipe part 52 and a center axis l2 of the supply pipe part 60 are shifted and arranged, section area of an avoidance passage 54 constructing a part of a suction passage 53 is sufficiently secured while avoiding the supply pipe part 60. Consequently, flow rate of fuel flowing in the suction passage 53 can be sufficiently secured even if the jet pump module 30 is miniaturized and thickness of the second pipe part 52 and a supply pipe part 60 is secured. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a jet pump module, and more particularly to a jet pump module that forms a flow of fuel in a fuel supply device housed in a fuel tank of an internal combustion engine (hereinafter, the internal combustion engine is referred to as an “engine”).

  2. Description of the Related Art A fuel supply device is known in which a fuel pump is housed in a sub tank installed inside a fuel tank, and maintains the liquid level inside the sub tank to the extent that the fuel pump can suck even if the liquid level in the fuel tank drops is there. In such a fuel supply device, a part of the pressurized fuel discharged from the fuel pump is supplied to the jet pump. By injecting high-pressure fuel from the nozzle of the jet pump toward the sub-tank, a suction pressure is formed on the sub-tank side into which the injected fuel flows, and the fuel around the sub-tank is sucked into the sub-tank (Patent Document 1). reference).

JP 2003-139007 A

  Since the jet pump can form a flow in the fuel with a simple structure, it is considered not only to suck the fuel from the fuel tank into the sub tank, but also to expand the application range. For example, when a vertical fuel tank is employed, the fuel tank is divided into two rooms. Therefore, a jet pump is applied to supply fuel from one chamber of the fuel tank partitioned into two chambers to the other chamber. The fuel tank also has an injection passage that connects the inlet from the fuel injection port to the tank body. Therefore, a jet pump is applied to suck the fuel staying in the injection passage into the tank body.

  As described above, the fuel supply apparatus is required to have a plurality of jet pumps. However, when a plurality of jet pumps are individually installed, the number of parts increases and piping for each jet pump becomes complicated. Most of the jet pumps are installed inside the sub tank or around the sub tank. Therefore, if a plurality of jet pumps are individually configured, it is difficult to secure a mounting space. On the other hand, if the size of the jet pump is reduced in order to secure a mounting space, the pipe portion forming the fuel passage is thinned or the diameter of the fuel passage is reduced. As a result, the strength of the jet pump and the performance may be reduced.

  Accordingly, an object of the present invention is to provide a jet pump module that integrates a plurality of jet pumps to reduce the size of the physique, and that does not cause a decrease in strength and performance, and a fuel supply device using the same. It is in.

  In the first aspect of the invention, the integrated first jet pump and second jet pump are provided. At least one of the first nozzle and the first fuel passage of the first jet pump or the second nozzle and the second fuel passage of the second jet pump is arranged with the center axis shifted. For example, by shifting the central axes of the first nozzle and the first fuel passage, the first jet pump can be reduced in size and necessary for maintaining the strength of the first pipe portion that forms the first nozzle and the first fuel passage. Even if the wall thickness is secured, the volume occupied by the first nozzle in the first fuel passage is reduced. Therefore, a sufficient cross-sectional area is secured in the first fuel passage to obtain the performance of the first jet pump. The same applies to the second jet pump. Therefore, the plurality of jet pumps can be integrated to reduce the size of the physique, and the strength and performance are not reduced.

  According to a second aspect of the present invention, the first jet pump and the second jet pump integrated with each other, and a supply pipe portion for supplying fuel to the first nozzle of the first jet pump and the second nozzle of the second jet pump are provided. ing. The supply pipe part is displaced from the second pipe part in the central axis. Thereby, even if the first jet pump and the second jet pump are integrated and downsized, and the wall thickness necessary for maintaining the strength of the first jet pump and the second jet pump is secured, the second pipe portion is formed. The second fuel passage and the supply passage for supplying fuel to the first nozzle and the second nozzle have a sufficient cross-sectional area to obtain the performance of the first jet pump and the second jet pump. Therefore, the plurality of jet pumps can be integrated to reduce the size of the physique, and the strength and performance are not reduced.

  According to a third aspect of the present invention, the second jet pump intersects the supply pipe portion substantially perpendicularly. Therefore, the second pipe part and the supply pipe part of the second jet pump intersect substantially perpendicularly. For example, when the central axis of the second pipe part and the supply pipe part is not shifted, the second pipe part and the supply pipe part are used to reduce the size of the integrated first jet pump and the second jet pump and ensure the necessary strength. If the thickness of the second fuel passage is maintained, it is difficult to secure a cross-sectional area of the second fuel passage at a portion where the second pipe portion and the supply pipe portion intersect. In the invention according to claim 3, the second pipe part and the supply pipe part intersect with each other in a state where the central axis is deviated. The cross-sectional area of the fuel passage is ensured. Therefore, the plurality of jet pumps can be integrated to reduce the size of the physique, and the strength and performance are not reduced.

  According to a fourth aspect of the present invention, the jet pump module is installed in a fuel tank having a first tank, a second tank, and an injection passage portion. The first jet pump is a transfer jet pump that supplies fuel from one of the first tank and the second tank to the other. The second jet pump is a suction jet pump that sucks fuel from the injection passage portion into the fuel tank. Thereby, the first jet pump and the second jet pump that perform different functions are integrated and miniaturized. Therefore, a jet pump that performs a plurality of functions without causing an increase in size of the sub tank is accommodated in the sub tank. Therefore, a plurality of jet pumps can be installed in the sub tank without increasing the size of the sub tank.

  In the invention according to claim 5, the jet pump module is accommodated in the sub tank inside the fuel tank. The first jet pump is a suction jet pump that pumps fuel from a fuel tank to a sub tank. The second jet pump is a suction jet pump that sucks fuel from the injection passage portion into the fuel tank. Thereby, the first jet pump and the second jet pump that perform different functions are integrated and miniaturized. Therefore, a jet pump that performs a plurality of functions without causing an increase in size of the sub tank is accommodated in the sub tank. Therefore, a plurality of jet pumps can be installed in the sub tank without increasing the size of the sub tank.

Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
A fuel supply apparatus according to a first embodiment of the present invention is shown in FIG. The fuel supply device 20 is installed inside the fuel tank 2 and supplies the fuel inside the fuel tank 2 to an external engine. As shown in FIGS. 2 and 3, the fuel supply apparatus 20 includes a flange 21, a sub tank 22, a jet pump module 30, a pump module 23, a pressure regulator 24, a suction filter 25, a suction jet pump 70, and the like. As shown in FIG. 2, the flange 21 closes the opening 4 that opens in the upper wall 3 of the fuel tank 2. The sub tank 22 is accommodated in the fuel tank 2. The fuel tank 2 is formed in a bowl shape having a recess 6 that straddles the drive shaft 5 of the vehicle, for example, with resin. The fuel tank 2 is partitioned by a recess 6 into a first tank chamber 7 and a second tank chamber 8 in which the fuel supply device 20 is installed. The fuel tank 2 includes an injection passage portion 11 and a breather 80 installed on the upper wall 3 and connected to the full tank liquid level detection valve 9. The injection passage portion 11 has one end connected to the fuel tank 2 and the other end connected to the injection port 12. The injection port 12 is opened, for example, in a part of the vehicle, and an injection device for injecting fuel is inserted therein. The injection passage portion 11 has a predetermined distance between the injection port 12 and the fuel tank.

  The breather 80 is connected between the vicinity of the full tank level detection valve 9 and the inlet 12. The full tank level detection valve 9 is opened when fuel is supplied. Thus, when fuel is supplied to the inside of the fuel tank 2, an air passage is formed through which the air inside the fuel tank 2 is discharged until the inside of the fuel tank 2 is full. On the other hand, when the fuel level in the fuel tank 2 reaches the upper wall 3 of the fuel tank 2, the full tank level detection valve 9 is closed by the fuel whose level has risen. As a result, the air inside the fuel tank 2 is not discharged to the outside, and the supply of further fuel to the inside of the fuel tank 2 is stopped.

  Due to restrictions when the fuel tank 2 is mounted on the vehicle, a portion lower than the fuel level when the fuel tank 2 is full may occur in the injection passage portion 11 and the breather 80 in some cases. In this case, if the full tank liquid level detection valve 9 is in an open state, the fuel inside the fuel tank 2 may sway and the fuel may flow into the breather 80. When the fuel flows into the breather 80, the fuel in the vicinity of the inlet 12 pushed out by the air passing through the breather 80 may be ejected from the opening during the next fuel supply. Thus, the fuel staying in the breather 80 is discharged by communicating the jet pump module 30 and the breather 80.

  The flange 21 of the fuel supply device 20 has a disk shape, and has press-fit portions 26 at both ends in the radial direction as shown in FIG. One end of a shaft 27 that supports the sub tank 22 is press-fitted into the press-fit portion 26. The other end portion of the shaft 27 is loosely inserted into a support portion 28 installed in the sub tank 22. The support portion 28 is formed in a cylindrical shape having an inner diameter that is slightly larger than the outer diameter of the shaft 27. Thereby, the support part 28 supports the shaft 27 so that a reciprocation is possible to an axial direction. The spring 29 installed on the outer peripheral side of the shaft 27 has one end in contact with the flange 21 and the other end in contact with the support portion 28 of the sub tank 22. Accordingly, the spring 29 applies a force in a direction in which the flange 21 and the sub tank 22 are separated from each other. As a result, even if the fuel tank 2 that accommodates the fuel supply device 20 expands or contracts due to a change in internal pressure or a change in the amount of fuel due to a temperature change, the bottom of the sub tank 22 is brought into contact with the bottom of the fuel tank 2 by the pressing force of the spring 29. Always pressed.

  The pump module 23 has a fuel pump and a fuel filter (not shown). The fuel pump has a motor (not shown) and a rotating member such as an impeller that is driven to rotate by the motor. When the rotating member is driven by the motor, a suction pressure is formed, and the fuel that has passed through the suction filter 25 is sucked into the pump module 23. The suction filter 25 removes relatively large foreign matters contained in the fuel sucked into the pump module 23. The fuel pump of the pump module 23 pressurizes and discharges the sucked fuel. A fuel filter is installed on the discharge side of the fuel pump. The fuel filter removes relatively small foreign matters contained in the fuel discharged from the fuel pump. The fuel pressurized by the pump module 23 is supplied to the pressure regulator 24. The pressure regulator 24 adjusts the pressure of the fuel discharged from the pump module 23 to a constant pressure. The fuel that has passed through the pressure regulator 24 is supplied to an engine (not shown) outside the fuel tank 2 via the discharge passage 13.

  A suction jet pump 70 is installed in the sub tank 22. The suction jet pump 70 has a nozzle (not shown) and a suction part 71 that connects the outer side and the inner side of the sub tank as shown in FIG. The suction jet pump 70 supplies the fuel outside the sub tank 22 to the inside using the suction pressure formed in the suction portion 71 by injecting high-pressure and high-speed fuel from the nozzle toward the suction portion 71. . Thereby, even if the liquid level of the fuel in the first tank chamber 7 of the fuel tank 2 is lowered, the inside of the sub tank 22 is filled with the fuel.

  The jet pump module 30 includes a transfer jet pump 40 as a first jet pump and a suction jet pump 50 as a second jet pump. The transfer jet pump 40 supplies the fuel stored in the second tank chamber 8 of the fuel tank 2 to the inside of the sub tank 22 accommodated in the first tank chamber 7. The suction jet pump 50 supplies the fuel remaining in the injection passage portion 11 to the inside of the sub tank 22. The transfer jet pump 40 and the suction jet pump 50 constituting the jet pump module 30 are integrally formed.

  As shown in FIGS. 1 and 4, the jet pump module 30 includes a first member 31, a second member 32, and a third member 33 made of resin. The second member 32 and the third member 33 are fixed to the first member 31 by, for example, welding. The first member 31 has a supply pipe section 60, a transfer nozzle 41 as a first nozzle, and a suction nozzle 51 as a second nozzle. The supply pipe portion 60 is cylindrical and forms a supply passage 61. One end of the supply passage 61 is connected to the booster of the pump module 23. In the pressure increasing unit of the pump module 23, the fuel is pressurized by the rotation of the rotating member. A part of the fuel pressurized by the pressure increasing unit is supplied to the transfer nozzle 41 and the suction nozzle 51 via the supply passage 61. Further, in the supply passage 61, a suction supply passage 72 is branched between the pump module 23 and the jet pump module 30, as shown in FIG. The suction supply passage 72 is connected to the nozzle of the suction jet pump 70 at the end on the side opposite to the supply passage. As a result, a part of the fuel pressurized by the booster of the pump module 23 is supplied not only to the jet pump module 30 but also to the suction jet pump 70. The jet pump module 30 and the suction jet pump 70 are not supplied with fuel from the boosting section of the pump module 23, but are supplied with fuel from the discharge side of the pump module 23, for example, or the pressure is adjusted by the pressure regulator 24. It is good also as a structure which supplies the fuel which became surplus by adjusting.

  As shown in FIGS. 1 and 4, the second member 32 is installed on the transfer nozzle 41 side of the first member 31. The second member 32 has a first pipe portion 42. The first pipe portion 42 is formed in a substantially L shape, and forms a transfer passage 43 as a first fuel passage. The 1st pipe part 42 is cylindrical and has accommodated the nozzle 41 for transfer inside. The transfer nozzle 41 and the first pipe portion 42 are arranged substantially coaxially. The transfer nozzle 41 and the first pipe portion 42 are not limited to being coaxial, and may be arranged with the central axis shifted. One end of the transfer passage 43 is connected to the second tank chamber 8 via the connection passage 14 as shown in FIG. The other end of the transfer passage 43 is connected to the inside of the sub tank 22.

  As shown in FIGS. 1 and 4, the third member 33 is installed on the suction nozzle 51 side of the first member 31. The third member 33 has the second pipe portion 52 together with the first member 31. The second pipe portion 52 intersects with the supply pipe portion 60 and forms a suction passage 53 as a second fuel passage. The 2nd pipe part 52 is cylindrical and has accommodated the suction nozzle 51 in the inside. The suction nozzle 51 and the second pipe portion 52 are arranged substantially coaxially. The suction nozzle 51 and the second pipe portion 52 are not limited to being coaxial, and may be arranged with the central axis shifted. One end of the suction passage 53 is connected to the injection passage portion 11 as shown in FIG. The other end of the suction passage 53 is connected to the inside of the sub tank 22.

  As shown in FIGS. 1 and 4, the second pipe portion 52 and the supply pipe portion 60 intersect each other substantially vertically. Therefore, the suction passage 53 formed by the second pipe portion 52 and the supply passage 61 formed by the supply pipe portion 60 intersect each other substantially vertically. On the other hand, the second pipe part 52 and the supply pipe part 60 are arranged with their center axes shifted as shown in FIG. Therefore, even when the second pipe part 52 and the supply pipe part 60 are orthogonal to each other, the central axis L1 of the second pipe part 52 and the central axis L2 of the supply pipe part 60 do not intersect. That is, the central axis L1 of the second pipe portion 52 and the central axis L2 of the supply pipe portion 60 are in a twisted relationship. By displacing the central axes of the second pipe part 52 and the supply pipe part 60, the avoidance path part 54 constituting a part of the suction path 53 is positioned on the radially outer side of the supply pipe part 60. As described above, by shifting the central axes of the second pipe portion 52 and the supply pipe portion 60, the avoidance passage portion 54 has a sufficient cross-sectional area.

Here, for comparison, FIG. 5 shows a jet pump module 30 in which the central axis L1 of the second pipe portion 52 and the central axis L2 of the supply pipe portion 60 are arranged without shifting and intersect each other. As described above, when the second pipe portion 52 and the supply pipe portion 60 are orthogonal to each other, the avoidance passage portion 55 that forms a part of the suction passage 53 needs to avoid the supply pipe portion 60. When the central axis L1 and the central axis l2 intersect without deviating, if the thickness of the second pipe portion 52 and the supply pipe portion 60 is increased to ensure strength, the cross-sectional area of the avoidance passage portion 55 is reduced. .
Therefore, in the case of the first embodiment shown in FIG. 1, the opening area of the avoidance passage portion 54 that forms the suction passage 53 by shifting the central axes of the second pipe portion 52 and the supply pipe portion 60 is as shown in FIG. Compared with, it is greatly expanded. Therefore, a sufficient flow rate of fuel sucked from the injection passage portion 11 flows through the suction passage 53.

Next, the operation of the jet pump module 30 will be described.
The pressurized fuel is supplied from the pressure increasing unit of the pump module 23 to the supply passage 61. The fuel supplied to the supply passage 61 is supplied to the transfer nozzle 41 and the suction nozzle 51 branched from the supply passage 61, respectively. The fuel supplied to the transfer nozzle 41 is injected from the transfer nozzle 41 into the transfer passage 43. Since the cross-sectional area of the transfer nozzle 41 is gradually reduced toward the outlet, high-speed fuel is injected from the transfer nozzle 41. As a result, the pressure decreases around the fuel injected from the transfer nozzle 41. As a result, suction pressure is generated around the transfer nozzle 41, and the fuel in the second tank chamber 8 is sucked through the connection passage 14 connected to the transfer passage 43. The fuel sucked from the second tank chamber 8 flows through the transfer passage 43 together with the fuel injected from the transfer nozzle 41 and is supplied into the sub tank 22.

  On the other hand, a part of the fuel supplied to the supply passage 61 is supplied to the suction nozzle 51. The fuel supplied to the suction nozzle 51 is injected from the suction nozzle 51 into the suction passage 53. The suction nozzle 51 squeezes the cross-sectional area from the supply passage 61, whereby high speed fuel is injected from the suction nozzle 51. As a result, the pressure decreases around the fuel injected from the suction nozzle 51. As a result, a suction pressure is generated around the suction nozzle 51, and the remaining fuel is sucked from the injection passage portion 11 connected to the suction passage 53. The fuel sucked from the injection passage portion 11 flows through the suction passage 53 together with the fuel injected from the suction nozzle 51 and is supplied into the sub tank 22.

  As described above, in the first embodiment, the central axis of the second pipe portion 52 that forms the suction passage 53 and the supply pipe portion 60 that forms the supply passage 61 are shifted from each other. For this reason, the transfer jet pump 40 and the suction jet pump 50 are integrally configured to reduce the size and avoid the configuration of the suction passage 53 even when the thickness of the supply pipe portion 60 is secured to maintain the strength. The cross-sectional area of the passage portion 54 is enlarged. Thereby, the fuel flow from the injection passage 11 to the sub tank 22 is not hindered. In addition, it is not necessary to reduce the diameter of the supply pipe portion 60 in order to increase the cross-sectional areas of the suction passage 53 and the avoidance passage portion 54. Thereby, the flow rate of the fuel injected from the transfer nozzle 41 and the suction nozzle 51 is not reduced, and the performance of the transfer jet pump 40 and the suction jet pump 50 is not lowered. Therefore, the transfer jet pump 40 and the suction jet pump 50 are integrated to reduce the size of the jet pump module 30, the strength and performance of the transfer jet pump 40 and the suction jet pump 50 are reduced, and the supply pipe section. A decrease in strength of 60 can be prevented.

  Since the sub tank 22 is accommodated inside the fuel tank 2, when the sub tank 22 is enlarged, the opening 4 of the fuel tank 2 needs to be enlarged. As a result, the strength of the fuel tank 2 may be reduced, or fuel or fuel vapor may leak due to the extension of the seal length. Therefore, in the first embodiment, the transfer jet pump 40 and the suction jet pump 50 are integrally formed, and the jet pump module 30 is downsized. Therefore, even when a plurality of jet pumps are installed inside the sub tank 22, the sub tank 22 can be prevented from being enlarged. Accordingly, it is possible to prevent the strength of the fuel tank 2 from decreasing and the leakage of fuel or fuel vapor.

(Second Embodiment)
A fuel supply apparatus according to a second embodiment of the present invention is shown in FIG. In addition, the same code | symbol is attached | subjected to the component substantially the same as 1st Embodiment, and description is abbreviate | omitted.
As shown in FIG. 6, the jet pump module 130 of the fuel supply device according to the second embodiment is supplied with fuel from the pressurizing part of the pump module 23. The jet pump module 130 is accommodated in the sub tank 22 as in the first embodiment. The jet pump module 130 includes a transfer jet pump 140 as a first jet pump and a suction jet pump 150 as a second jet pump, which are integrated as in the first embodiment.

  The jet pump module 130 includes a first member 131, a second member 132, a third member 133, and a fourth member 134, each formed of resin. The first member 131 and the second member 132, and the third member 133 and the fourth member 134 are fixed by, for example, welding. The jet pump module 130 is integrally configured by coupling the fixed first member 131 and second member 132 to the third member 133 and fourth member 134.

  The first member 131 includes a supply pipe portion 160, a flow dividing portion 161, a transfer nozzle 141 as a first nozzle, and a cylindrical portion 171. The supply pipe portion 160 of the first member 131 is connected to the pressure increasing portion of the pump module 23 via the pipe member 162. The pipe member 162 is, for example, a resin flexible tube. The diversion unit 161 distributes the fuel supplied from the supply pipe unit 160 to the transfer jet pump 140 and the suction jet pump 150.

  The second member 132 is installed on the transfer nozzle 141 side of the first member 131. The second member 132 has a first pipe portion 142 together with the first member 131. The first pipe portion 142 is formed in a substantially U shape and forms a transfer passage 143 as a first fuel passage. The 1st pipe part 142 is cylindrical and has accommodated the transfer nozzle 141 inside. The transfer nozzle 141 and the first pipe portion 142 are arranged substantially coaxially. Note that the transfer nozzle 141 and the first pipe portion 142 are not limited to being coaxial, and may be arranged with the center axis shifted. The transfer passage 143 includes a suction side passage 144 connected to the second tank chamber 8 and a discharge side passage 145 in which the transfer nozzle 141 is accommodated. In the case of this embodiment, the suction side passage 144 and the discharge side passage 145 are arranged substantially in parallel. The suction side passage 144 and the discharge side passage 145 may be arranged at a predetermined angle. The suction side passage 144 is connected to the second tank chamber 8 through the connection passage 14 on the side opposite to the discharge passage. The discharge side passage 145 has an anti-suction side passage connected to the inside of the sub tank 22. By injecting high-pressure fuel from the transfer nozzle 141, a high-speed fuel flow is formed in the discharge side passage 145 on the same line as the transfer nozzle 141. At this time, the pressure is reduced around the injected fuel, and a fuel flow is formed from the suction side passage 144 having a high pressure toward the discharge side passage 145. Thereby, the fuel in the second tank chamber 8 is supplied to the sub tank 22.

  The third member 133 is installed on the counter-transfer nozzle side of the first member 131. The third member 133 has a second pipe portion 152 together with the fourth member 134. The second pipe portion 152 forms a suction passage 153 as a second passage. The third member 133 has an insertion portion 172 that is inserted into the cylindrical portion 171 at an end portion on the first member 131 side. By inserting the insertion portion 172 into the cylindrical portion 171, the first member 131 and the second member 132, the third member 133, and the fourth member 134 are configured integrally. A space between the tube portion 171 and the insertion portion 172 is liquid-tightly sealed by a seal member 173. The third member 133 further includes a connection passage portion 181, a suction nozzle 151 as a second nozzle, an attachment portion 182, and a large diameter portion 183. The connection passage part 181 connects the flow dividing part 161 of the first member 131 and the suction nozzle 151. The suction nozzle 151 extends substantially parallel to the suction passage 153 from the end of the connection passage portion 181 on the side opposite to the flow dividing portion. The attachment portion 182 is installed at the end of the second pipe portion 152 on the side opposite to the fourth member. A tube member (not shown) that forms the connection passage 14 is attached to the attachment portion 182. The large-diameter portion 183 is installed on the fourth member 134 side of the attachment portion 182. A suction nozzle 151 is accommodated inside the large diameter portion 183.

  The fourth member 134 is installed on the side opposite to the attachment portion of the third member 133. The fourth member 134 has a second pipe portion 152 together with the third member 133. That is, the suction passage 153 is formed on the inner peripheral side of the attachment portion 182 and the large diameter portion 183 of the third member 133 and the inner peripheral side of the fourth member 134. The fourth member 134 is formed in a cylindrical shape and accommodates a suction nozzle 151 at one end. The other end of the fourth member 134 is connected to the inside of the sub tank 22.

  By forming the suction passage 153 with the third member 133 and the fourth member 134, the suction passage 153 becomes a discharge side formed by the suction side passage 154 formed by the attachment portion 182 and the large diameter portion 183 and the fourth member 134. And a passage 155. By injecting high-pressure fuel from the suction nozzle 151, a high-speed fuel flow is formed in the discharge side passage 155. At this time, the pressure decreases around the injected fuel, and a fuel flow is formed from the suction side passage 154 having a high pressure toward the discharge side passage 155. As a result, the fuel in the injection passage portion 11 is supplied into the sub tank 22.

  In the second embodiment, the suction nozzle 151 is disposed so that the central axis is shifted from the suction side passage 154 of the suction passage 153. That is, the central axis of the suction nozzle 151 is shifted from the central axis of the suction side passage 154. As a result, on the side opposite to the supply passage portion of the suction nozzle 151, a sufficient distance can be secured between the outer peripheral wall 151a of the suction nozzle 151 and the inner peripheral wall 133a of the third member 133, as shown in FIG.

  For comparison, for example, as shown in FIG. 8, when the suction nozzle 151 and the suction side passage 154 of the suction passage 153 are arranged coaxially, the inner peripheral wall 133 a of the third member 133 that forms the suction passage 153 and the suction nozzle 151. A gap is formed between the outer peripheral wall 151a. At this time, the suction nozzle 151 protrudes inside the suction side passage 154 formed by the third member 133. Therefore, the cross-sectional area of the suction side passage 154 is reduced, and it becomes difficult to secure a sufficient fuel flow rate from the suction side passage 154 to the discharge side passage 155.

  On the other hand, in the second embodiment, as shown in FIGS. 6 and 7, the suction nozzle 151 and the suction side passage 154 are arranged with their center axes shifted. Therefore, a sufficient distance is secured between the outer peripheral wall 151a of the suction nozzle 151 and the inner peripheral wall 133a of the third member 133 that forms the suction side passage 154. As a result, a sufficient cross-sectional area of the suction side passage 154 is ensured. In the second embodiment, the suction nozzle 151 and the suction side passage 154 are arranged with the center axis shifted, and the suction nozzle 151 and the discharge side passage 155 are arranged substantially coaxially. However, the suction nozzle 151 and the discharge side passage 155 may be arranged with the central axis shifted. Further, the suction nozzle 151 does not have to be displaced from the center axis of the entire suction passage 153, and the center axis may be shifted in the vicinity of the portion where the suction nozzle 151 is installed, that is, in a part of the suction passage 153.

  As described above, in the second embodiment, the suction nozzle 151 and the suction passage 153 are arranged with the center axis shifted. Thereby, even when the suction nozzle 151 is accommodated inside the suction passage 153 in order to reduce the size of the jet pump module 130, a sufficient passage area of the suction passage 153 whose sectional area is easily reduced is secured. Therefore, even when the jet pump module 130 is downsized, the strength and performance of the suction jet pump 150 can be prevented from being reduced.

  In the second embodiment, an example in which the central axes of the suction nozzle 151 and the suction passage 153 are shifted with respect to the suction jet pump 150 whose passage area is particularly likely to be reduced as the jet pump module 130 is reduced in size will be described. did. However, not only the suction jet pump 150 but also the transfer jet pump 140 may be arranged by shifting the central axes of the transfer nozzle 141 and the transfer passage 143.

  In the plurality of embodiments described above, the example in which the transfer jet pump is applied as the first jet pump of the jet pump module and the suction jet pump is applied as the second jet pump has been described. However, the transfer jet pump and the suction jet pump may be interchanged, and the transfer jet pump, the suction jet pump, and the suction jet pump may be combined in any combination. Moreover, although the example which divides | segments a jet pump module into three members or four members was demonstrated, the division | segmentation of a jet pump module is arbitrary and does not restrict | limit the part which produces a number and a function.

It is the figure seen from the arrow I direction of FIG. It is a schematic diagram which shows the fuel supply apparatus to which the jet pump module by 1st Embodiment of this invention is applied. It is a side view which shows the fuel supply apparatus to which the jet pump module by 1st Embodiment of this invention is applied. It is sectional drawing which shows the jet pump module by 1st Embodiment of this invention. It is a figure which shows the jet pump module where the central axis of a supply pipe part and a 2nd pipe part crosses for a comparison with 1st Embodiment, Comprising: It is the figure seen from the direction corresponding to the arrow I of FIG. It is sectional drawing which shows the jet pump module by 2nd Embodiment of this invention. It is the figure which expanded the VII part of FIG. It is sectional drawing which shows the principal part of the jet pump module which arrange | positioned the suction side channel | path and the suction nozzle coaxially for a comparison with 2nd Embodiment.

Explanation of symbols

  2 Fuel tank, 7 First tank chamber, 8 Second tank chamber, 11 Injection passage, 20 Fuel supply device, 22 Sub tank, 30, 130 Jet pump module (jet pump module), 40, 140 Transfer jet pump (first One jet pump), 41, 141 Transfer nozzle (first nozzle), 42, 142 First pipe portion, 43, 143 Transfer passage (first fuel passage), 50, 150 Suction jet pump (second jet pump) 51, 151 Suction nozzle (second nozzle), 52, 152 Second pipe portion, 53, 153 Suction passage (second fuel passage), 60 Supply pipe portion, 61 Supply passage, 70 Jet pump for suction

Claims (5)

A first nozzle and a first pipe portion that accommodates the first nozzle and forms a first fuel passage therein, and injects fuel from the first nozzle, thereby flowing the fuel into the first fuel passage. A first jet pump to be formed;
The second jet unit is configured integrally with the first jet pump, has a second nozzle and a second pipe part that houses the second nozzle and forms a second fuel passage, and injects fuel from the second nozzle. A second jet pump for forming a fuel flow in the second fuel passage by
At least one of the first nozzle and the first fuel passage, or the second nozzle and the second fuel passage is arranged with a center axis shifted. A first nozzle, and a first pipe portion that houses the first nozzle and forms a first fuel passage, and injects fuel from the first nozzle to flow the fuel into the first fuel passage. A first jet pump to be formed;
The second jet unit is configured integrally with the first jet pump, has the second nozzle, and the second pipe part that houses the second nozzle and forms the second fuel passage, and injects fuel from the second nozzle. A second jet pump that forms a fuel flow in the second fuel passage by
A supply pipe that is connected to the first nozzle and the second nozzle, forms a supply passage for supplying fuel to the first nozzle and the second nozzle, and is arranged with a center axis shifted from the second pipe portion And
A jet pump module comprising:   The jet pump module according to claim 2, wherein the second jet pump intersects the supply pipe part substantially perpendicularly. It is installed inside a fuel tank having a first tank and a second tank connected to each other, and an injection passage part for injecting fuel inside,
The first jet pump is a transfer jet pump that supplies fuel from one of the first tank or the second tank to the other,
4. The jet pump module according to claim 1, wherein the second jet pump is a suction jet pump that sucks fuel from the injection passage portion into the fuel tank. 5. It is installed inside a fuel tank having an injection passage part for injecting fuel therein, and is housed in a sub tank inside the fuel tank,
The first jet pump is a suction jet pump that pumps fuel inside the fuel tank into the sub tank,
4. The jet pump module according to claim 1, wherein the second jet pump is a suction jet pump that sucks fuel from the injection passage portion into the fuel tank. 5.

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