WO2011142010A1 - 燃料噴射弁 - Google Patents
燃料噴射弁 Download PDFInfo
- Publication number
- WO2011142010A1 WO2011142010A1 PCT/JP2010/058035 JP2010058035W WO2011142010A1 WO 2011142010 A1 WO2011142010 A1 WO 2011142010A1 JP 2010058035 W JP2010058035 W JP 2010058035W WO 2011142010 A1 WO2011142010 A1 WO 2011142010A1
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- WO
- WIPO (PCT)
- Prior art keywords
- controller
- needle
- fuel
- injection valve
- fuel injection
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/1886—Details of valve seats not covered by groups F02M61/1866 - F02M61/188
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/162—Means to impart a whirling motion to fuel upstream or near discharging orifices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/26—Fuel-injection apparatus with elastically deformable elements other than coil springs
Definitions
- the present invention relates to a fuel injection valve.
- Patent Document 1 is known as a proposal for atomizing fuel spray.
- the injection hole provided in the fuel injection nozzle disclosed in Patent Document 1 includes a first injection hole part on the upstream side and a second injection hole part on the downstream side.
- the 2nd nozzle hole part it has an accommodating part which accommodates a part of jet stream as a fuel lump between the inner wall of the 2nd nozzle hole part, and the jet stream which flows out from the 1st nozzle hole part. That is, the fuel injection nozzle disclosed in Patent Document 1 effectively generates cavitation and atomizes fuel by increasing the cross-sectional area of the downstream nozzle hole inside the nozzle hole.
- Patent Document 1 differs in the amount of fuel flowing into the nozzle hole and the flow velocity depending on the lift amount of the needle. For this reason, it is difficult to generate optimal cavitation both when the needle is in a low lift state and when the needle is in a high lift state. That is, when the cross-sectional area of the nozzle hole is suddenly increased to cause cavitation in the fuel, if the needle lift is increased, the negative pressure is insufficient due to the increase in the fuel flow area, and cavitation occurs. It becomes difficult. On the other hand, if the flow path area and the shape of the nozzle hole are set so as to generate appropriate cavitation when the lift amount increases, there is a risk of excessive cavitation when the needle is in a low lift state.
- an object of the present invention is to generate cavitation appropriately and promote atomization of fuel regardless of the lift amount of the needle.
- a fuel injection valve disclosed in the present specification includes a nozzle body provided with a sac chamber at a tip portion and an injection hole opened in the sac chamber, and sliding in the nozzle body. Positioning provided between a needle that is freely arranged and forms a fuel introduction path leading to the sac chamber with the nozzle body, and an upper edge of the sac chamber in the nozzle body and the nozzle hole And the position of the upstream edge is displaced toward the upstream side so as to approach the needle when the needle is lifted and the fuel flows into the sack chamber side. And a cylindrical controller.
- the fuel that flows into the sac chamber from the fuel introduction path can generate cavitation at the part where the area of the flow path is suddenly expanded or the flow path is bent sharply.
- the upstream edge of the controller is displaced toward the upstream so that the position of the upstream edge approaches the needle, thereby maintaining a narrow gap between the upstream edge of the controller and the needle. be able to.
- Cavitation can be generated by the fuel that has passed between the upstream edge of the controller and the needle maintained in a narrow state and then flowing into the region where the flow path area is enlarged.
- cavitation can be generated efficiently and appropriately even if the needle lift amount changes.
- the controller has a first inclined surface that inclines toward the center side of the nozzle body toward the downstream side at the upstream portion on the inner peripheral side, and the needle moves toward the downstream side as the first side.
- the 1st opposing surface spaced apart from an inclined surface can be provided.
- the area where the channel area is enlarged can be created by separating the first inclined surface and the first facing surface. Cavitation occurs when the fuel that has passed between the upstream edge of the controller and the needle, which is kept in a narrow state, flows into the region surrounded by the first inclined surface and the first facing surface.
- the controller may have a second inclined surface that is inclined toward the inner wall side of the nozzle body toward the downstream side toward the downstream portion on the inner peripheral side.
- the controller can be levitated by the fuel flowing along the second inclined surface. As the controller floats, the upstream edge of the controller is displaced upstream.
- the needle in conjunction with the control element having the second inclined surface, can include a protruding portion protruding toward the second inclined surface.
- control element can be provided with a notch at the lower end thereof in correspondence with the position of the nozzle hole provided in the nozzle body.
- the fuel passes through the notch and flows into the nozzle hole.
- the fuel passing through the notch can push up the controller.
- a notch includes a pressure receiving surface inclined from the inner peripheral side to the outer peripheral side of the control element, and has an opening area of the outer peripheral surface of the control element that is larger than an opening area of the inner peripheral surface of the control element. Can be set small. As a result, the controller is pushed up as the fuel passing through the notch collides with the pressure receiving surface.
- the notch portion can block at least a part of the nozzle hole in a state where the controller is positioned by the positioning portion.
- the state where the controller is positioned is a low lift state.
- the fuel flows from the direction biased to the nozzle hole. Thereby, the fuel flowing into the nozzle hole becomes a swirl flow in the nozzle hole. Further, the fuel that passes through the notch and flows into the nozzle hole can generate cavitation. As a result, fuel atomization and low penetration can be achieved.
- the controller may include an elastic member that is compressed when the needle contacts the upstream edge between the upstream edge and the contact portion with the positioning portion.
- the elastic member returns to its original shape due to its elasticity when the needle is lifted and released from the compressed state by the needle.
- the position of the upstream edge portion of the controller is displaced toward the upstream side so as to approach the needle.
- interval of the upstream edge part of a control element and a needle is narrow can be maintained. Cavitation is generated by the fuel that has passed between the upstream edge of the controller and the needle maintained in the narrow state and the needle flowing into the region where the flow path area is enlarged.
- Another fuel injection valve disclosed in the present specification is provided with a sac chamber at a tip portion and a nozzle body provided with an injection hole opened in the sac chamber, and is slidably disposed in the nozzle body. Positioned by a needle that forms a fuel introduction path to the sac chamber between the nozzle body and a positioning portion provided in the nozzle body, and positioned at the position of the injection hole provided in the nozzle body Correspondingly, it is provided with a notch provided at the lower end thereof, and has a cylindrical shape that is displaced toward the upstream side when the needle is lifted and the fuel flows into the sack chamber side. And a controller. The fuel passes through the notch and flows into the nozzle hole. At this time, the fuel passing through the notch can push up the controller.
- Such a notch includes a pressure receiving surface inclined from the inner peripheral side to the outer peripheral side of the control element, and has an opening area of the outer peripheral surface of the control element that is larger than an opening area of the inner peripheral surface of the control element. Can be set small. As a result, the controller is pushed up as the fuel passing through the notch collides with the pressure receiving surface.
- the notch portion can block at least a part of the nozzle hole in a state where the controller is positioned by the positioning portion.
- the positioned state is a low lift state.
- the fuel flows from the direction biased to the nozzle hole. Thereby, the fuel flowing into the nozzle hole becomes a swirl flow in the nozzle hole. Further, the fuel that passes through the notch and flows into the nozzle hole can generate cavitation. As a result, fuel atomization and low penetration can be achieved.
- FIG. 1 is a schematic view showing a state where the tip of the fuel injection valve of the first embodiment is disassembled.
- FIG. 2A is an explanatory view showing a fuel injection valve in a valve-closed state in the first embodiment
- FIG. 2B is a fuel injection in a state where the needle is lifted and the controller is lifted in the first embodiment.
- FIG. 3 is a schematic view showing a state where the tip of the fuel injection valve of the second embodiment is disassembled.
- 4A is an explanatory view showing a fuel injection valve in a closed state in the second embodiment
- FIG. 4B is an explanatory view showing a fuel injection valve in a low lift state in the second embodiment.
- FIG. 1 is a schematic view showing a state where the tip of the fuel injection valve of the first embodiment is disassembled.
- FIG. 2A is an explanatory view showing a fuel injection valve in a valve-closed state in the first embodiment
- FIG. 2B
- FIG. 4C is an explanatory diagram showing the fuel injection valve in a high lift state in the second embodiment.
- FIG. 5 is a schematic view showing a state where the tip of the fuel injection valve of the third embodiment is disassembled.
- 6A is an explanatory view showing a fuel injection valve in a closed state in the third embodiment
- FIG. 6B is an explanatory view showing a fuel injection valve in a low flow velocity state in the third embodiment.
- FIG. 6C is an explanatory view showing a fuel injection valve in a high flow rate state in the third embodiment.
- FIG. 7 is a schematic view showing a state where the tip of the fuel injection valve of the fourth embodiment is disassembled.
- FIG. 8 (A-1) is an explanatory view showing a fuel injection valve in a low lift state in the fourth embodiment
- FIG. 8 (A-2) is a notch portion in the state shown in FIG. 8 (A-1).
- FIG. 8 (B-1) is an explanatory view showing the fuel injection valve in the middle lift state in the embodiment 4
- FIG. 8 (B-2) is a notch portion in the state shown in FIG. 8 (B-1).
- FIG. 8 (C-1) is an explanatory view showing the fuel injection valve in the high lift state in the fourth embodiment
- FIG. 8 (C-2) is a notch portion in the state shown in FIG. 8 (C-1). It is explanatory drawing which shows the positional relationship of a nozzle hole.
- FIG. 9 (A-1) is an explanatory view showing a fuel injection valve in a low lift state in the fifth embodiment, and FIG. 9 (A-2) is a notch in the state shown in FIG. 9 (A-1). It is explanatory drawing which shows the positional relationship of a nozzle hole.
- FIG. 9 (B-1) is an explanatory view showing the fuel injection valve in the middle lift state in the fifth embodiment, and FIG. 9 (B-2) is a notch portion in the state shown in FIG. 9 (B-1). It is explanatory drawing which shows the positional relationship of a nozzle hole.
- FIG. 9 (A-1) is an explanatory view showing a fuel injection valve in a low lift state in the fifth embodiment
- FIG. 9 (A-2) is a notch in the state shown in FIG. 9 (A-1).
- FIG. 9 (C-1) is an explanatory view showing a fuel injection valve in a high lift state in the fifth embodiment
- FIG. 9 (C-2) is a notch portion in the state shown in FIG. 9 (C-1). It is explanatory drawing which shows the positional relationship of a nozzle hole.
- FIG. 1 is a schematic view showing a state where the tip of the fuel injection valve 100 is disassembled.
- 2A is an explanatory view showing the fuel injection valve 100 in a closed state
- FIG. 2B is an explanatory view showing the fuel injection valve 100 in a state where the needle 104 is lifted and the controller 103 is lifted.
- FIG. 1 is a schematic view showing a state where the tip of the fuel injection valve 100 is disassembled.
- 2A is an explanatory view showing the fuel injection valve 100 in a closed state
- FIG. 2B is an explanatory view showing the fuel injection valve 100 in a state where the needle 104 is lifted and the controller 103 is lifted.
- FIG. 1 is a schematic view showing a state where the tip of the fuel injection valve 100 is disassembled.
- 2A is an explanatory view showing the fuel injection valve 100 in a closed state
- FIG. 2B is an explanatory view showing the fuel injection valve 100 in a state where the needle 104 is lifted and the controller 103 is
- the fuel injection valve 100 includes a nozzle body 101 in which a sac chamber 102 is provided at the tip and an injection hole 103 that opens into the sac chamber 102 is provided. Four nozzle holes 103 are provided at equal intervals.
- the fuel injection valve 100 also includes a needle 104 that is slidably disposed in the nozzle body 101 and forms a fuel introduction path 105 that communicates with the nozzle body 101 to the sac chamber 102.
- the needle 104 is driven by a piezo actuator.
- the nozzle body 101 is provided with a positioning portion 106 therein. The positioning portion 106 is provided between the upper edge portion 102a of the sac chamber 102 in the nozzle body 101 and the injection hole 103, and has a step shape as shown in the drawing.
- the fuel injection valve 100 further includes a cylindrical controller 107.
- the controller 107 includes a stepped contact portion 107 a, and the contact portion 107 a is positioned by being seated on the positioning portion 106.
- the position of the upstream edge portion 107b of the control element 107 is displaced toward the upstream side so as to approach the needle 104 when the needle 104 is lifted and the fuel flows into the sac chamber 102 side. Can do.
- the control element 107 has a first inclined surface 107c that is inclined toward the center side of the nozzle body 101 toward the downstream side at the upstream portion on the inner peripheral side.
- the controller 107 further includes a second inclined surface 107d that is inclined toward the inner wall 101a side of the nozzle body 101 toward the downstream side at the downstream portion on the inner peripheral side.
- the needle 104 includes a first facing surface 104b that is separated from the first inclined surface 107c toward the downstream side on the downstream side of the seat portion 104a.
- the controller 107 when the fuel injection valve 100 is in the closed state, the controller 107 is in a state in which the contact portion 107a is seated on the stepped positioning portion 106. .
- the inflow of fuel from the fuel introduction path 105 into the sac chamber 102 is blocked by the contact of the seat 104a of the needle 104 with the upstream edge 107b.
- Cavitation c can be generated by the fuel that has passed between the upstream edge of the controller and the needle maintained in the narrow state and the needle flowing into the region where the flow path area is enlarged.
- the cavitation c can be appropriately generated.
- FIG. 3 is a schematic view showing a state where the tip of the fuel injection valve 200 is disassembled.
- FIG. 4A is an explanatory view showing the fuel injection valve 200 in a closed state.
- FIG. 4B is an explanatory view showing the fuel injection valve 200 in a low lift state.
- FIG. 4C is an explanatory view showing the fuel injection valve 200 in a high lift state.
- the fuel injection valve 200 according to the second embodiment is different from the fuel injection valve 100 according to the first embodiment in that the fuel injection valve 200 includes a needle 204 instead of the needle 104.
- the fuel injection valve 200 includes a nozzle body 101 and a controller 107, as with the fuel injection valve 100.
- Constituent elements common to the fuel injection valve 100 and the fuel injection valve 200 are denoted by the same reference numerals in the drawings, and detailed description thereof is omitted.
- the needle 204 includes a first facing surface 204b on the downstream side of the seat portion 204a as in the needle 104 of the first embodiment.
- the first facing surface 204b is a surface facing the first inclined surface 107c included in the controller 107.
- the first facing surface 204b is separated from the first inclined surface 107c toward the downstream side.
- the needle 204 further includes a protruding portion 204c that protrudes toward the second inclined surface 107d included in the controller 107.
- the controller 107 is pushed up by the balance between the pressure of the fuel acting from the upstream side and the pressure of the fuel acting from the downstream side.
- the distance from the second inclined surface 107d is narrowed.
- the force by which the fuel flowing between the protruding portion 204c and the second inclined surface 107d raises the controller 107 is strengthened.
- control element 107 itself and the environment around the control element 107 may be such that the control element 107 can be pushed up and the balance of the force capable of rising can be ensured.
- the controller 107 when the fuel injection valve 100 is in a closed state, the controller 107 is in a state in which the contact portion 107a is seated on the step-shaped positioning portion 106. .
- the inflow of fuel from the fuel introduction path 105 into the sac chamber 102 is blocked by the contact of the seat portion 204a of the needle 204 with the upstream edge portion 107b.
- the controller 107 is pushed up to the upstream side. That is, the needle 204 is in a high lift state, and the amount of fuel flowing into the sac chamber 102 becomes large. When this large amount of fuel tries to pass through the narrowed region, the controller 107 is pushed up to secure the flow rate.
- the cavitation c can be appropriately generated.
- FIG. 5 is a schematic view showing a state where the tip of the fuel injection valve 300 is disassembled.
- FIG. 6A is an explanatory view showing the fuel injection valve 300 in a closed state.
- FIG. 6B is an explanatory diagram showing the fuel injection valve in a low flow rate state.
- FIG. 6C is an explanatory diagram showing the fuel injection valve 300 in a high flow rate state.
- the fuel injection valve 300 according to the third embodiment is different from the fuel injection valve 100 according to the first embodiment in that the fuel injection valve 300 includes a controller 307 instead of the controller 107.
- the fuel injection valve 300 includes a nozzle body 101 and a needle 104 as in the fuel injection valve 100. Constituent elements common to the fuel injection valve 100 and the fuel injection valve 300 are denoted by the same reference numerals in the drawings, and detailed description thereof is omitted.
- the controller 307 includes an elastic member 307c between the upstream edge portion 307b and the contact portion 307a to the positioning portion 106.
- the elastic member 307c is compressed by the needle 104 coming into contact with the upstream edge 307b.
- the elastic member 307c is in the compressed state, the position of the upstream edge 307b is displaced downstream, and when released from the compressed state, the elastic member 307c returns to its original shape due to its elasticity.
- the position of the upstream edge portion 307 b of the controller 307 is displaced toward the upstream side so as to approach the needle 104.
- the control element 307 is not bonded to the positioning part 106, the contact part 307a is normally seated on the positioning part 106 due to the balance of fuel pressure or the like.
- the controller 307 when the fuel injection valve 300 is in the closed state, the controller 307 is in a state in which the contact portion 307a is seated on the stepped positioning portion 106. .
- the inflow of fuel from the fuel introduction path 105 into the sac chamber 102 is blocked by the contact of the seat 104a of the needle 104 with the upstream edge 307b.
- the controller 307 is pressed by the needle 104, and the elastic member 307c is in a compressed state.
- the elastic member 307c is released from the compressed state due to being pressed by the needle 104.
- the state shown in FIG. 6B is a low flow rate state, but at this time, the fuel pressure around the controller 307 is low. For this reason, the elastic member 307c can return to the original shape, and the position of the upstream edge portion 307b is displaced upstream.
- Cavitation c can be generated by the fuel that has passed between the upstream edge 307b of the controller 307 maintained in a narrow state and the needle 104 flowing into the region where the flow path area is enlarged. .
- the cavitation c can be appropriately generated.
- FIG. 7 is a schematic view showing a state where the tip of the fuel injection valve 400 is disassembled.
- FIG. 8A-1 is an explanatory view showing the fuel injection valve 400 in a low lift state
- FIG. 8A-2 shows the notch 407c and the injection in the state shown in FIG. 8A-1.
- FIG. 8 (B-1) is an explanatory view showing the fuel injection valve 400 in the middle lift state
- FIG. 8 (B-2) shows the notch 407c and the injection in the state shown in FIG. 8 (B-1).
- FIG. 8 (B-1) is an explanatory view showing the fuel injection valve 400 in the middle lift state
- FIG. 8 (B-2) shows the notch 407c and the injection in the state shown in FIG. 8 (B-1).
- FIG. 8 (C-1) is an explanatory view showing the fuel injection valve 400 in the high lift state
- FIG. 8 (C-2) shows the notch 407c and the injection in the state shown in FIG. 8 (C-1). It is explanatory drawing which shows the positional relationship with the hole 403.
- the fuel injection valve 400 according to the fourth embodiment is different from the fuel injection valve 100 according to the first embodiment in that the fuel injection valve 400 includes a cylindrical controller 407 instead of the controller 107.
- the fuel injection valve 400 includes a needle 104 as in the fuel injection valve 100.
- a nozzle body 401 is adopted instead of the nozzle body 101.
- the nozzle body 401 is common to the nozzle body 101 of the first embodiment in that it includes a sac chamber 402, a nozzle hole 403, and a positioning portion 406.
- the point that four nozzle holes 403 are provided at equal intervals is also common to the nozzle body 101 of the first embodiment.
- components common to the fuel injection valve 100 and the fuel injection valve 400 are denoted by the same reference numerals in the drawings, and detailed description thereof is omitted.
- the controller 407 is displaced toward the upstream side when the needle 104 is lifted and the fuel flows into the sac chamber 402 side.
- the controller 407 includes a stepped contact portion 407 a and is positioned when the contact portion 407 a is seated on the positioning portion 406.
- the controller 407 is provided with four notches 407c at the lower end thereof corresponding to the positions of the four injection holes 403 provided in the nozzle body 401.
- the notch 407 c includes a pressure receiving surface 407 c 1 that is inclined from the inner peripheral side of the controller 407 toward the outer peripheral side. Further, the control element 407 has a shape in which the opening area S2 of the outer peripheral surface is smaller than the opening area S1 of the inner peripheral surface of the control element 407. Both the opening on the inner peripheral surface and the opening on the outer peripheral surface of the notch 407c have a triangular shape.
- controller 407 includes a rotation stopper 407d.
- the rotation stopper 407d suppresses rotation with respect to the nozzle body 401. Thereby, the positional relationship between the nozzle hole 403 and the notch 407c is maintained.
- FIG. 8A-1 shows the direction of the arrow 408 in FIG. 8A-1, that is, the state where the notch 407c is viewed from the inside of the controller 407.
- FIG. The notch 407 c is in a state in which the notch 407 c interferes with the injection hole 403 and blocks a part of the injection hole 403 when the controller 407 is positioned on the positioning part 406. Yes. Since part of the nozzle hole 403 is blocked by the notch 407 c, the fuel flows into the nozzle hole 403 from a biased direction.
- the fuel flowing into the nozzle hole 403 becomes a swirling flow in the nozzle hole 403. Further, the fuel that passes through the notch 407c and flows into the nozzle hole generates cavitation c. As a result, fuel atomization and low penetration can be achieved.
- the fuel injection valve 400 shown in FIG. 8 (B-1) is in the middle lift state.
- the controller 407 floats from the positioning portion 406.
- the control element 407 floats because the control element 407 is pushed up by the fuel that passes through the notch 407 c and flows into the nozzle hole 403.
- the force that pushes up the controller 407 is strengthened by the collision of fuel with the pressure receiving surface 407c1 provided in the controller 407.
- FIG. 8B-2 shows the direction of the arrow 408 in FIG. 8B-1, that is, the state where the notch 407c is viewed from the inside of the controller 407.
- FIG. When the controller 407 is pushed up, the communication area between the notch 407c and the nozzle hole 403 increases. Thereby, a desired injection amount is ensured. Further, since cavitation c is generated by the boundary between the lower end of the notch 407c and the nozzle hole 403, the state in which atomization of the spray is promoted is maintained.
- FIG. 8C-1 shows the direction of the arrow 408 in FIG. 8C-1, that is, the state where the notch 407c is viewed from the inside of the controller 407.
- the cavitation c can be appropriately generated in the low lift state and the intermediate lift state, and the fuel flow rate in the high lift state can be secured. it can.
- the upstream edge 407b of the controller 407 does not contribute to the generation of cavitation c.
- FIG. 9A-1 is an explanatory view showing the fuel injection valve 500 in the low lift state
- FIG. 9A-2 shows the notch 507c and the injection in the state shown in FIG. 9A-1.
- FIG. 9 (B-1) is an explanatory view showing the fuel injection valve 500 in the middle lift state
- FIG. 9 (B-2) shows the notch 507c and the injection in the state shown in FIG. 9 (B-1).
- FIG. 9 (C-1) is an explanatory view showing the fuel injection valve 500 in the high lift state
- FIG. 8 (C-2) is a view showing the notch 507c and the injection in the state shown in FIG. 8 (C-1).
- FIG. 9 (C-1) is an explanatory view showing the fuel injection valve 500 in the high lift state
- FIG. 8 (C-2) is a view showing the notch 507c and the injection in the state shown in FIG. 8 (C-1).
- FIG. 9A-1 is an explanatory view showing the fuel injection valve 500 in the low lift state
- the fuel injection valve 500 according to the fifth embodiment is different from the fuel injection valve 400 according to the fourth embodiment in that the fuel injection valve 500 includes a controller 507 instead of the controller 407. Since the fuel injection valve 500 is not substantially different from the fuel injection valve 400 of the fourth embodiment in other points, common components are denoted by the same reference numerals in the drawings, and details thereof are described. The detailed explanation is omitted.
- the controller 507 includes a contact portion 507a, an upstream edge 507b, and a notch 507c.
- the position of the upstream edge portion 507b is located on the upstream side of the upstream edge portion 407b in the controller 407. That is, the controller 507 includes an upstream edge 507b obtained by extending the upstream edge 407b of the controller 407 to the upstream side.
- the controller 507 has such a shape. That is, in the fifth embodiment, it is possible to generate cavitation c between the upstream edge 507 b of the controller 507 and the needle 104 and to generate cavitation c in the nozzle hole 403.
- FIG. 8A-2 shows the direction of the arrow 508 in FIG. 8A-1, that is, the state in which the notch 507c is viewed from the inside of the controller 507.
- FIG. The notch 507 c is in a state in which the notch 507 c interferes with the injection hole 403 and blocks a part of the injection hole 403 when the controller 507 is positioned on the positioning part 406. Yes. Since part of the nozzle hole 403 is blocked by the notch 407 c, the fuel flows into the nozzle hole 403 from a biased direction.
- the fuel flowing into the nozzle hole 403 becomes a swirling flow in the nozzle hole 403. Further, the fuel that passes through the notch 407c and flows into the nozzle hole generates cavitation c. Further, cavitation c is generated between the upstream edge 507 b and the needle 104. As a result, fuel atomization and low penetration can be achieved.
- the fuel injection valve 500 shown in FIG. 9 (B-1) is in the middle lift state.
- the controller 507 floats from the positioning unit 406.
- the reason why the control element 507 floats in this way is that the control element 507 is pushed up by the fuel that flows into the nozzle hole 403 through the notch 507c.
- the force that pushes up the controller 507 is strengthened by the collision of fuel with the pressure receiving surface 407c1 provided in the controller 407.
- FIG. 9B-2 shows the direction of the arrow 508 in FIG. 9B-1, that is, the state where the notch 507c is viewed from the inside of the controller 507.
- FIG. When the controller 507 is pushed up, the communication area between the notch 507c and the nozzle hole 403 increases.
- cavitation c is generated by the boundary between the lower end portion of the notch 507 c and the nozzle hole 403. Further, when the controller 507 is pushed up upstream, the position of the upstream edge 507b is displaced upstream, and the distance between the upstream edge 507b of the controller 507 and the needle 104 is kept narrow. be able to. Thereby, cavitation c can be generated. A state in which atomization of the spray is promoted by these actions is maintained.
- the fuel injection valve 500 shown in FIG. 9 (C-1) is in a high lift state.
- the controller 507 is in a state of being further levitated than in the middle lift state.
- the reason why the control element 507 floats is because the control element 507 is pushed up by the fuel that passes through the notch 507c and flows into the nozzle hole 403 as described above.
- FIG. 9C-2 shows the direction of the arrow 508 in FIG. 9C-1, that is, the state where the notch 507c is viewed from the inside of the controller 507.
- FIG. When the controller 507 is pushed up, the interference between the notch 507c and the injection hole 403 is eliminated, and the opening of the injection hole 403 is fully opened.
- the cavitation c can be appropriately generated in the low lift state and the intermediate lift state. Furthermore, cavitation can be generated while ensuring a fuel flow rate in a high lift state.
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- Fuel-Injection Apparatus (AREA)
Abstract
Description
101、401…ノズルボディ
102、402…サック室
102a…サック室の上縁部
103、403…噴孔
104、204…ニードル
104a、204a…シート部
104b、204b…第1対向面
204c…突出部
105…燃料導入路
106…位置決め部
107、307、407、507…制御子
107a、307a、407a、507a…当接部
107b、307b、407b、507b…上流側縁部
307c…弾性部材
407c…切欠き部
407c1…受圧面
407d…回転止め
Claims (11)
- 先端部にサック室が設けられるとともに、当該サック室内に開口する噴孔が設けられたノズルボディと、
前記ノズルボディ内に摺動自在に配置され、前記ノズルボディとの間に前記サック室へ通じる燃料導入路を形成するニードルと、
前記ノズルボディ内の前記サック室の上縁部と前記噴孔との間に設けられた位置決め部によって位置決めされるとともに、前記ニードルがリフトして燃料が前記サック室側に流入する状態となっているときに、上流側縁部の位置が、前記ニードルに近づくように上流側に向かって変位する筒形状の制御子と、
を備えたことを特徴とした燃料噴射弁。 - 前記制御子は、内周側の上流部に下流側に向かうに従って前記ノズルボディの中心側に向かうように傾斜する第1傾斜面を有し、
前記ニードルは、下流側に向かうに従って、前記第1傾斜面と離間する第1対向面を備えることを特徴とする請求項1記載の燃料噴射弁。 - 前記制御子は、内周側の下流部に下流側に向かうに従って、前記ノズルボディの内壁側へ向かうように傾斜する第2傾斜面を有することを特徴とする請求項1又は2記載の燃料噴射弁。
- 前記ニードルは、前記第2傾斜面に向かって突出した突出部を備えたことを特徴とする請求項3記載の燃料噴射弁。
- 前記制御子は、前記ノズルボディに設けられた前記噴孔の位置に対応させて、その下端部に切欠き部を備えたことを特徴とする請求項1乃至4のいずれか一項記載の燃料噴射弁。
- 前記切欠き部は、前記制御子の内周側から外周側に向かって傾斜した受圧面を備えるとともに、前記制御子の内周面の開口面積よりも前記制御子の外周面の開口面積が小さいことを特徴とする請求項5記載の燃料噴射弁。
- 前記切欠き部は、前記制御子が前記位置決め部に位置決めされた状態で、少なくとも前記噴孔の一部を塞ぐことを特徴とする請求項5又は6記載の燃焼噴射弁。
- 前記制御子は、前記上流側縁部と前記位置決め部への当接部との間に、前記上流側縁部に前記ニードルが当接することによって圧縮される弾性部材を備えたことを特徴とする請求項1乃至7のいずれか一項記載の燃料噴射弁。
- 先端部にサック室が設けられるとともに、当該サック室内に開口する噴孔が設けられたノズルボディと、
前記ノズルボディ内に摺動自在に配置され、前記ノズルボディとの間に前記サック室への燃料導入路を形成するニードルと、
前記ノズルボディ内に設けられた位置決め部によって位置決めされるとともに、前記ノズルボディに設けられた前記噴孔の位置に対応させて、その下端部に設けられた切欠き部を備え、前記ニードルがリフトして燃料が前記サック室側に流入する状態となっているときに、上流側に向かって変位する筒形状の制御子と、を備えたことを特徴とする燃料噴射弁。 - 前記切欠き部は、前記制御子の内周側から外周側に向かって傾斜した受圧面を備えるとともに、前記制御子の内周面の開口面積よりも前記制御子の外周面の開口面積が小さいことを特徴とする請求項9記載の燃料噴射弁。
- 前記切欠き部は、前記制御子が前記位置決め部に位置決めされた状態で、少なくとも前記噴孔の一部を塞ぐことを特徴とする請求項9又は10記載の燃焼噴射弁。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10851393.8A EP2570650B1 (en) | 2010-05-12 | 2010-05-12 | Fuel injection valve |
US13/695,986 US20130048758A1 (en) | 2010-05-12 | 2010-05-12 | Fuel injection valve |
PCT/JP2010/058035 WO2011142010A1 (ja) | 2010-05-12 | 2010-05-12 | 燃料噴射弁 |
CN201080066734.XA CN102893018B (zh) | 2010-05-12 | 2010-05-12 | 燃料喷射阀 |
JP2012514638A JP5648684B2 (ja) | 2010-05-12 | 2010-05-12 | 燃料噴射弁 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2010/058035 WO2011142010A1 (ja) | 2010-05-12 | 2010-05-12 | 燃料噴射弁 |
Publications (1)
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WO2011142010A1 true WO2011142010A1 (ja) | 2011-11-17 |
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PCT/JP2010/058035 WO2011142010A1 (ja) | 2010-05-12 | 2010-05-12 | 燃料噴射弁 |
Country Status (5)
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US (1) | US20130048758A1 (ja) |
EP (1) | EP2570650B1 (ja) |
JP (1) | JP5648684B2 (ja) |
CN (1) | CN102893018B (ja) |
WO (1) | WO2011142010A1 (ja) |
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MX2013010611A (es) * | 2011-03-15 | 2013-10-01 | Coatings Foreign Ip Co Llc | Dispositivo de aspersion y boquilla para dispositivo de aspersion. |
US9470197B2 (en) * | 2012-12-21 | 2016-10-18 | Caterpillar Inc. | Fuel injector having turbulence-reducing sac |
DE102016215637A1 (de) * | 2016-08-19 | 2018-02-22 | Robert Bosch Gmbh | Kraftstoffeinspritzdüse |
CN108397328A (zh) * | 2018-02-01 | 2018-08-14 | 海宁市承志产品设计有限公司 | 一种燃料喷射头 |
WO2022150581A1 (en) * | 2021-01-08 | 2022-07-14 | Cummins Inc. | Fuel injector devices, systems, and methods |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH1130167A (ja) * | 1997-07-09 | 1999-02-02 | Zexel Corp | 燃料噴射ノズル |
JP3463565B2 (ja) * | 1998-07-10 | 2003-11-05 | トヨタ自動車株式会社 | 燃料噴射装置 |
JP2004019481A (ja) | 2002-06-13 | 2004-01-22 | Denso Corp | 燃料噴射ノズル |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
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US4197997A (en) * | 1978-07-28 | 1980-04-15 | Ford Motor Company | Floating ring fuel injector valve |
US6698666B2 (en) * | 2001-09-20 | 2004-03-02 | Denso Corporation | Fuel injection valve |
CN101371033B (zh) * | 2007-03-27 | 2010-10-27 | 三菱电机株式会社 | 燃料喷射阀 |
-
2010
- 2010-05-12 EP EP10851393.8A patent/EP2570650B1/en not_active Not-in-force
- 2010-05-12 US US13/695,986 patent/US20130048758A1/en not_active Abandoned
- 2010-05-12 WO PCT/JP2010/058035 patent/WO2011142010A1/ja active Application Filing
- 2010-05-12 JP JP2012514638A patent/JP5648684B2/ja not_active Expired - Fee Related
- 2010-05-12 CN CN201080066734.XA patent/CN102893018B/zh not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH1130167A (ja) * | 1997-07-09 | 1999-02-02 | Zexel Corp | 燃料噴射ノズル |
JP3463565B2 (ja) * | 1998-07-10 | 2003-11-05 | トヨタ自動車株式会社 | 燃料噴射装置 |
JP2004019481A (ja) | 2002-06-13 | 2004-01-22 | Denso Corp | 燃料噴射ノズル |
Non-Patent Citations (1)
Title |
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See also references of EP2570650A4 * |
Also Published As
Publication number | Publication date |
---|---|
JPWO2011142010A1 (ja) | 2013-07-22 |
EP2570650A1 (en) | 2013-03-20 |
JP5648684B2 (ja) | 2015-01-07 |
US20130048758A1 (en) | 2013-02-28 |
CN102893018A (zh) | 2013-01-23 |
EP2570650A4 (en) | 2014-01-08 |
CN102893018B (zh) | 2015-04-01 |
EP2570650B1 (en) | 2015-06-24 |
EP2570650A8 (en) | 2013-06-05 |
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