WO2022244562A1 - 電磁式燃料噴射弁 - Google Patents
電磁式燃料噴射弁 Download PDFInfo
- Publication number
- WO2022244562A1 WO2022244562A1 PCT/JP2022/017712 JP2022017712W WO2022244562A1 WO 2022244562 A1 WO2022244562 A1 WO 2022244562A1 JP 2022017712 W JP2022017712 W JP 2022017712W WO 2022244562 A1 WO2022244562 A1 WO 2022244562A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- valve
- magnetic cylinder
- movable core
- magnetic
- rear end
- Prior art date
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 45
- 238000002347 injection Methods 0.000 title claims abstract description 27
- 239000007924 injection Substances 0.000 title claims abstract description 27
- 230000002093 peripheral effect Effects 0.000 claims abstract description 40
- 238000003466 welding Methods 0.000 claims abstract description 8
- 238000012805 post-processing Methods 0.000 abstract description 6
- 238000001816 cooling Methods 0.000 abstract description 4
- 239000011247 coating layer Substances 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 4
- 229920003002 synthetic resin Polymers 0.000 description 4
- 239000000057 synthetic resin Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000004323 axial length Effects 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- 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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
-
- 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
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
-
- 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
Definitions
- the present invention relates to an electromagnetic fuel injection valve that is mainly used in the fuel supply system of an engine.
- a valve body accommodated in the valve housing and cooperating with the valve seat; a non-magnetic cylinder coaxially coupled to the rear end of the magnetic cylinder; a fixed core coupled to the valve body; a movable core coupled to the rear end of the valve body and arranged in the magnetic cylinder and the non-magnetic cylinder with the rear end facing the front end of the fixed core; a coil arranged on the outer circumference of a fixed core and generating an attractive force between the fixed core and the movable core when energized;
- the present invention relates to an improvement in an electromagnetic fuel injection valve in which the magnetic cylinder and the non-magnetic cylinder are joined together by welding.
- the non-magnetic cylinder and the fixed core when connecting the magnetic cylinder, the non-magnetic cylinder, and the fixed core, the non-magnetic cylinder and the fixed core are butt-welded first, and then the non-magnetic cylinder and the fixed core are welded together.
- the magnetic cylinders are butt welded together.
- the fixed core and the non-magnetic cylinder united together have a large heat capacity because the fixed core is thick, while the thin magnetic cylinder has a small heat capacity.
- the contraction strain due to cooling is remarkable, and in particular, the inner peripheral edge of the rear end near the welded part with the non-magnetic cylinder deforms radially inward, forming a protuberance.
- the protuberances interfere with the movable core and interfere with the operation of the movable core.
- the inner peripheral surface of the non-magnetic cylindrical body was subjected to finishing by cutting, that is, post-processing.
- the present invention has been made in view of such circumstances. It is an object of the present invention to provide an electromagnetic fuel injection valve which does not require the post-processing and which enables a reduction in manufacturing cost.
- the present invention provides a valve housing comprising a magnetic cylindrical body coaxially coupled to the rear end of a valve seat member having a valve seat, and a valve seat housed in the valve housing.
- a non-magnetic cylinder coaxially coupled to the rear end of the magnetic cylinder;
- a fixed core coaxially coupled to the rear end of the non-magnetic cylinder;
- a movable core coupled to the rear end portion and arranged in the magnetic cylinder and the non-magnetic cylinder with the rear end face facing the front end face of the fixed core; , a coil for generating an attractive force between the fixed core and the movable core; and a valve spring for biasing the movable core and the valve body in the valve closing direction of the valve body when the coil is de-energized.
- the inner peripheral surface of the magnetic cylinder facing the movable core has a A first feature is that a tapered surface with a larger diameter is provided toward the end side.
- the present invention is characterized in that the inner peripheral surface of the non-magnetic cylindrical body is provided with a sliding guide surface for guiding the sliding of the movable core with respect to the non-magnetic cylindrical body, and the magnetic cylindrical body
- a second feature is that the inner peripheral surface excluding the tapered surface is formed to have a larger diameter than the slide guide surface.
- a space having a triangular cross section is defined between the tapered surface formed on the inner peripheral surface of the magnetic cylinder and the outer peripheral surface of the movable core.
- a sliding guide surface is formed on the inner circumference of the magnetic cylinder for guiding the sliding of the movable core relative to the magnetic cylinder, and the inner circumference of the magnetic cylinder excluding the tapered surface is formed. Since the peripheral surface is formed to have a larger diameter than the sliding guide surface, when the synthetic resin coating layer covering the outer peripheral surface of the magnetic cylinder is injection molded, the inner peripheral surface of the magnetic cylinder is cooled by cooling them. Even if the diameter is reduced, the inner peripheral surface thereof does not protrude radially inward from the sliding guide surface. Therefore, smooth sliding of the movable core on the sliding guide surface can be ensured.
- FIG. 1 is a longitudinal sectional view showing an embodiment of an electromagnetic fuel injection valve for an internal combustion engine according to the present invention; Enlarged view of 2 arrows in FIG.
- the fuel injection side is defined as the front, and the fuel inlet side is defined as the rear.
- a cylinder head 40 of an engine E is provided with a mounting hole 41 that opens into a combustion chamber 42.
- the mounting hole 41 is fitted with an electromagnetic fuel injection valve I that can inject fuel into the combustion chamber 42. is installed.
- a cushion member 43 is interposed between the fuel injection valve I and the cylinder head 40 .
- the valve housing 2 of the electromagnetic fuel injection valve I includes a cylindrical valve seat member 3, a magnetic cylinder 4 fitted to the outer peripheral surface of the rear end portion of the valve seat member 3 and welded in a liquid-tight manner.
- a non-magnetic cylinder 6 is abutted against the rear end of the magnetic cylinder 4 and welded in a liquid-tight manner. It is composed of a hollow cylindrical fixed core 5 to be welded and a fuel inlet tube 26 fitted to the outer periphery of the rear end of the fixed core 5 and welded in a liquid-tight manner.
- the valve seat member 3 includes a valve hole 7 opening at the front end face, a conical valve seat 8 continuing to the inner peripheral end of the valve hole 7, and a cylindrical guide hole continuing to the large diameter portion of the valve seat 8. 9.
- a steel plate injector plate 10 having a plurality of fuel injection holes 11 communicating with the valve holes 7 is liquid-tightly welded to the front end face of the valve seat member 3 .
- a hollow cylindrical movable core 12 facing the front end face of the fixed core 5 is fitted to the magnetic cylindrical body 4 extending from that portion to the front end of the non-magnetic cylindrical body 6 .
- a valve body 13 is connected to the movable core 12 .
- the hollow cylindrical stationary core 5 and movable core 12 are thicker than the magnetic cylindrical body 4 and the non-magnetic cylindrical body 6 .
- the valve element 13 includes a spherical valve portion 14 which can slide in the guide hole 9 so as to open and close the valve hole 7 in cooperation with the valve seat 8, and a valve portion 14 having a front end fixed to the valve portion 14.
- the rear end of the valve rod 15 is press-fitted to the inner peripheral surface of the movable core 12 and welded. Therefore, the valve element 13 can move up and down within the valve housing integrally with the movable core 12 .
- the valve rod 15 is made of a pipe material with a slit 15a, the inside of which communicates with the hollow portion of the movable core 12, and the inside and outside of the valve rod 15 communicate through the slit 15a.
- a plurality of flat surfaces 17 are formed around the spherical valve portion 14 to allow passage of fuel.
- the injection holes 11 form a series of fuel flow paths 18 within the valve housing 2 .
- a retainer 20 made of a slotted pipe material is press-fitted into the hollow portion of the fixed core 5 at its intermediate portion and fixed, and its front end serves as a first spring seat 21 .
- the rear end portion of the valve rod 15 ends in the middle of the hollow portion of the movable core 12, and the upper end portion thereof serves as the second spring seat 22.
- a spring 23 is compressed, and the set load of the valve spring 23 urges the movable core 12 downward away from the fixed core 5 , that is, in the seating direction of the valve body 13 on the valve seat 8 .
- the set load of this valve spring 23 is adjusted by the fitting depth of the retainer 20 to the fixed core 5 .
- a ring-shaped stopper member 35 made of a non-magnetic material is embedded in the inner peripheral surface of the movable core 12 and protrudes slightly from the rear end surface.
- a coil assembly 28 is fitted around the outer periphery of the valve housing 2 so as to correspond to the fixed core 5 and the movable core 12 .
- This coil assembly 28 consists of a synthetic resin bobbin 29 fitted on the outer peripheral surface of the fixed core 5 from the rear end of the magnetic cylinder 4 and a coil 30 wound thereon.
- a terminal support arm 29a is integrally formed at the rear end of the bobbin 29 to support the base end of the power supply terminal 33 projecting to one side thereof. be done.
- the coil assembly 28 is covered with a yoke 31 on approximately half of its circumferential surface.
- a synthetic resin coating layer 27 covering the outer peripheral surface of the magnetic cylinder 4 and the fuel inlet tube 26 and embedding the coil assembly 28 is injection molded.
- a coupler 34 that accommodates and holds the power supply terminal 33 and protrudes to one side of the coil assembly 28 is molded integrally with the coating layer 27 .
- a fuel filter 36 is attached to the inlet of the fuel inlet tube 26 .
- a fuel cap 46 is fitted on the outer circumference of the upper end of the fuel inlet tube 26 with a seal member 47 interposed therebetween.
- This fuel cap 46 is one of a plurality of fuel distribution caps branched from a fuel rail 45 connected to a discharge port of a fuel pump (not shown).
- valve spring 22 presses the movable core 12 and the valve element 13 forward, causing the valve portion 14 of the valve element 13 to be seated on the valve seat 8 .
- the magnetic flux generated by the coil 30 runs through the yoke 31, the magnetic cylinder 4, the movable core 12, and the fixed core 5 in sequence.
- the core 12 is attracted to the fixed core 5 while compressing the valve spring 23, causing the valve portion 14 of the valve element 13 to be separated from the valve seat 8, so that the valve hole 7 is opened.
- high-pressure fuel pressure-fed from a fuel pump (not shown) to the fuel inlet cylinder 26 passes through the fuel passage 18 of the valve housing 2 and is directly injected into the combustion chamber 42 of the engine E from the fuel injection hole 11 .
- the stopper member 35 protruding from the rear end surface of the movable core 12 abuts against the front end surface of the fixed core 5, leaving a predetermined gap between the opposed end surfaces of the fixed core 5 and the movable core 12, which will be described later.
- the coil 30 is turned off, the residual magnetism between the cores 5 and 12 is reduced, and the valve closing response of the valve body 13 is improved.
- the outer peripheral surfaces of the magnetic cylinder 4, the non-magnetic cylinder 6 and the fixed core 5 are formed to have the same diameter.
- the inner peripheral surface of the non-magnetic cylindrical body 6 facing the movable core 12 is formed with a slide guide surface 49 into which the movable core 12 is slidably fitted.
- a tapered surface 50 is formed extending from the intermediate portion to the rear end and increasing in diameter toward the rear end.
- the diameter D2 of the inner peripheral surface of the magnetic cylinder 4 excluding the tapered surface 50 is set larger than the diameter D1 of the sliding guide surface 49 . Therefore, the inner peripheral surface of the magnetic cylindrical body 4 retreats radially outward from the sliding guide surface 49 .
- the non-magnetic cylindrical body 6 integrated with the thick fixed core 5 has a large heat capacity, whereas the thin magnetic cylindrical body 4 has a small heat capacity. For this reason, after welding between the non-magnetic cylinder 6 and the magnetic cylinder 4, shrinkage strain occurs in the magnetic cylinder 4 due to cooling. A raised portion 52 is generated by deformation.
- the tapered surface 50 is formed in advance on the inner peripheral surface of the magnetic cylinder 4, there is a gap between the tapered surface 50 and the outer peripheral surface of the movable core 12.
- a space 51 having a triangular cross-section is defined, and the raised portion 52 is absorbed in this space 51 , so that the raised portion 52 does not interfere with the movable core 12 .
- a space 51 having a triangular cross-section between the tapered surface 50 and the movable core 12 narrows the magnetic path between the movable core 12 and the magnetic cylindrical body 4 when the coil 30 is energized, so that the magnetic path between the fixed core 5 and the movable core 12 is reduced.
- the axial length L of the tapered surface 50 is 1 to 1.5 mm.
- a slide guide surface 49 is formed on the inner peripheral surface of the magnetic cylinder 4 to guide the sliding of the movable core 12 against it. Since the inner peripheral surface excluding the tapered surface 50 is formed to have a larger diameter than the sliding guide surface 49, the inner peripheral surface of the magnetic cylindrical body 4 recedes radially outward from the sliding guide surface 49. there is As a result, even if the inner peripheral surface of the magnetic cylinder 4 is slightly reduced in diameter as described above, the reduced inner peripheral surface does not protrude radially inward from the slide guide surface 49. .
- the movable core 12 is ensured to slide smoothly on the sliding guide surface 49 of the non-magnetic cylindrical body 6 without the conventional post-processing. Therefore, the movable core 12 can respond to the on/off of the energization of the coil 30 at all times and can open and close the valve body 13 appropriately.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
磁性円筒体4,非磁性円筒体6及び固定コア5の三者の結合に当たっては,先ず非磁性円筒体6及び固定コア5を相互に突き合わせ溶接し,次いで非磁性円筒体6及び磁性円筒体4を相互に突き合わせ溶接する。而して,非磁性円筒体6及び固定コア5間には溶接ビードb1が形成され,非磁性円筒体6及び磁性円筒体4には溶接ビードb2が形成される。
D1・・・摺動ガイド面の直径
D2・・・磁性円筒体内周面の直径
2・・・・弁ハウジング
3・・・・弁座部材
4・・・・磁性円筒体
5・・・・固定コア
6・・・・非磁性円筒体
8・・・・弁座
12・・・可動コア
13・・・弁体
27・・・被覆層
30・・・コイル
49・・・摺動ガイド面
50・・・テーパ面
51・・・三角形状空間
52・・・隆起部
Claims (2)
- 弁座(8)を有する弁座部材(3)の後端部に磁性円筒体(4)を同軸状に結合してなる弁ハウジング(2)と,該弁ハウジング(2)内に収容されて前記弁座(8)と協働する弁体(13)と,前記磁性円筒体(4)の後端に同軸状に結合される非磁性円筒体(6)と,該非磁性円筒体(6)の後端部に同軸状に結合される固定コア(5)と,前記弁体(13)の後端部に結合され,後端面を前記固定コア(5)の前端面に対向させながら前記磁性円筒体(4)及び非磁性円筒体(6)内に配置される可動コア(12)と,前記固定コア(5)の外周に配設され,通電時,前記固定コア(5)及び可動コア(12)間に吸引力を生じさせるコイル(30)と,該コイル(30)の通電遮断時,可動コア(12)及び前記弁体(13)を,該弁体(13)の閉弁方向に付勢する弁ばね(23)とを備え,前記磁性円筒体(4)及び非磁性円筒体(6)が溶接により相互に結合される電磁式燃料噴射弁において,
前記磁性円筒体(4)の,前記可動コア(12)に対向する内周面には,その中間部から後端にわたり,その後端側に向かって大径となるテーパ面(50)が設けられることを特徴とする電磁式燃料噴射弁。 - 請求項1に記載の電磁式燃料噴射弁において,
前記非磁性円筒体(6)の内周面に,それとの前記可動コア(12)の摺動を案内する摺動ガイド面(49)が設けられる一方,前記磁性円筒体(4)の,前記テーパ面(50)を除く内周面が,前記摺動ガイド面(49)よりも大径に形成されることを特徴とする電磁式燃料噴射弁。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202280035345.3A CN117321300A (zh) | 2021-05-19 | 2022-04-13 | 电磁式燃料喷射阀 |
JP2023522331A JPWO2022244562A1 (ja) | 2021-05-19 | 2022-04-13 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2021-084810 | 2021-05-19 | ||
JP2021084810 | 2021-05-19 |
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Publication Number | Publication Date |
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WO2022244562A1 true WO2022244562A1 (ja) | 2022-11-24 |
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ID=84141269
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP2022/017712 WO2022244562A1 (ja) | 2021-05-19 | 2022-04-13 | 電磁式燃料噴射弁 |
Country Status (3)
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JP (1) | JPWO2022244562A1 (ja) |
CN (1) | CN117321300A (ja) |
WO (1) | WO2022244562A1 (ja) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01112007U (ja) * | 1988-01-22 | 1989-07-27 | ||
JPH0371604U (ja) * | 1989-11-16 | 1991-07-19 | ||
JP2005240733A (ja) * | 2004-02-27 | 2005-09-08 | Keihin Corp | 電磁式燃料噴射弁およびその製造方法 |
JP2018025184A (ja) * | 2016-07-28 | 2018-02-15 | 株式会社デンソー | 燃料噴射弁 |
-
2022
- 2022-04-13 JP JP2023522331A patent/JPWO2022244562A1/ja active Pending
- 2022-04-13 WO PCT/JP2022/017712 patent/WO2022244562A1/ja active Application Filing
- 2022-04-13 CN CN202280035345.3A patent/CN117321300A/zh active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01112007U (ja) * | 1988-01-22 | 1989-07-27 | ||
JPH0371604U (ja) * | 1989-11-16 | 1991-07-19 | ||
JP2005240733A (ja) * | 2004-02-27 | 2005-09-08 | Keihin Corp | 電磁式燃料噴射弁およびその製造方法 |
JP2018025184A (ja) * | 2016-07-28 | 2018-02-15 | 株式会社デンソー | 燃料噴射弁 |
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Publication number | Publication date |
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CN117321300A (zh) | 2023-12-29 |
JPWO2022244562A1 (ja) | 2022-11-24 |
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