WO2010110324A1 - 接続頭部を有する高圧燃料噴射管およびその製造方法 - Google Patents

接続頭部を有する高圧燃料噴射管およびその製造方法 Download PDF

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Publication number
WO2010110324A1
WO2010110324A1 PCT/JP2010/055101 JP2010055101W WO2010110324A1 WO 2010110324 A1 WO2010110324 A1 WO 2010110324A1 JP 2010055101 W JP2010055101 W JP 2010055101W WO 2010110324 A1 WO2010110324 A1 WO 2010110324A1
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WO
WIPO (PCT)
Prior art keywords
tube axis
axis direction
fuel injection
annular flange
pressure fuel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2010/055101
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English (en)
French (fr)
Japanese (ja)
Inventor
栄司 渡辺
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Usui Kokusai Sangyo Kaisha Ltd
Original Assignee
Usui Kokusai Sangyo Kaisha Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Usui Kokusai Sangyo Kaisha Ltd filed Critical Usui Kokusai Sangyo Kaisha Ltd
Priority to US13/256,347 priority Critical patent/US20120006298A1/en
Priority to ES10756120T priority patent/ES2714679T3/es
Priority to EP10756120.1A priority patent/EP2412967B1/en
Priority to CN201080009119.5A priority patent/CN102333951B/zh
Publication of WO2010110324A1 publication Critical patent/WO2010110324A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004—Joints; Sealings
    • F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on, or into, one of the joint parts
    • F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
    • F16L19/025—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member the pipe ends having integral collars or flanges
    • F16L19/028—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member the pipe ends having integral collars or flanges the collars or flanges being obtained by deformation of the pipe wall
    • F16L19/0286—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member the pipe ends having integral collars or flanges the collars or flanges being obtained by deformation of the pipe wall and being formed as a flange
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49231—I.C. [internal combustion] engine making

Definitions

  • the present invention is based on a thick steel pipe having a relatively small diameter, which is frequently used, for example, for a fuel supply path in a diesel internal combustion engine, preferably used for a common rail and an injector of a diesel engine equipped with a pressure accumulating fuel injection system.
  • the present invention relates to a connection head structure of a high-pressure fuel injection pipe.
  • connection head As a high-pressure fuel injection pipe having this type of connection head, as illustrated in FIG. 19, a spherical sheet surface 113 is provided at the connection end of a thick steel pipe 111 having a relatively small diameter, A connection head formed by an annular flange portion 115 provided at a distance from the seat surface 113 in the tube axis direction, and an arc surface 114 that continues to the seat surface 113 and tapers toward the tip to the annular flange portion 115. What has the part 112 is known (refer FIG. 4 of patent document 1).
  • connection head 112 is formed by a buckling process by pressing in the tube axis direction by a punch member from the outside, and spreads to the outside of the peripheral wall due to the buckling process by the pressing.
  • a pocket (annular recess) 116 having an increased inner surface tensile stress due to an increase in inner diameter and stress concentration is formed on the inner peripheral surface of the head, and it has been used in such a state.
  • Cavitation erosion occurs near the pocket due to the high-pressure fluid during installation, radial cracks due to fatigue failure start radially from the wrinkles near the pocket, or around the pocket There was a problem of circumferential cracks due to fatigue failure.
  • the present applicant for example, at the connection end of a thick steel pipe having a relatively small diameter, a spherical sheet surface, and an annular flange portion provided at an interval in the tube axis direction from the sheet surface
  • a part of the conical surface has a shallow annular shape.
  • Patent Document 2 An outer peripheral surface on the other side
  • a connecting head having a circular concave groove with a shallow depth inside is formed by processing the head to be a frustoconical or truncated arc-shaped seat surface on the seat, and the neck of the connecting head
  • Patent Document 2 proposes a shape to method to cover the connecting washer that fits around the lower outer peripheral surface
  • the present invention is based on cavitation erosion that occurs near the pocket due to the generation of cracks from the flange near the pocket accompanying the formation of the pocket during head molding and the flow of high-pressure fluid during use of the arrangement.
  • the above-mentioned technique is almost the same as the above-mentioned technique. It is an object of the present invention to propose a high-pressure fuel injection pipe having a connection head that can obtain the same or higher effect, and a method for manufacturing the same.
  • a high-pressure fuel injection pipe having a connection head includes a truncated conical or truncated arc-shaped sheet surface at a connection end of a thick steel pipe having a relatively small diameter, and a tube axis extending from the sheet surface.
  • Connecting head comprising an annular flange portion formed at intervals in a direction and a cylindrical surface formed between the annular flange portion or a fillet portion of the annular flange portion connected to the seat surface
  • the contour of the cross section in the tube axis direction from the end of the fillet portion of the annular flange portion toward the seat surface is the cross section of the tube axis direction
  • the rear side opening angle ⁇ with respect to the tube axis is 0 °.
  • the length of the cylindrical surface portion in the tube axis direction is h.
  • the ratio of the h and H are characterized in that it has a connection head which is 0.33 ⁇ h / H ⁇ 0.85.
  • the sheet surface is preferably a spherical surface.
  • the contour of the cross section in the tube axis direction of the cylindrical surface portion is not limited to a straight line, but may be a curved line that is slightly convex outward.
  • the manufacturing method of the high-pressure fuel injection pipe having the connection head according to the present invention is formed by buckling by pressing the punch member in the tube axial direction from the outside to the end of the thick steel pipe having a relatively small diameter.
  • a high-pressure fuel injection pipe having a connection head composed of a cylindrical surface formed between a fillet portion of a flange portion, from the end portion of the fillet portion of the annular flange portion to a seat surface
  • the contour of the cross section in the direction of the tube axis direction has an inner diameter portion where the rear side opening angle ⁇ with respect to the tube axis is 0 ° ⁇ ⁇ 20 °, preferably 0 ° ⁇ ⁇ 15 ° in the cross section shape in the tube axis direction, And the length in the tube axis direction of the inner diameter portion is h
  • the ratio of h to H is 0.33 ⁇ h / H ⁇ 0.
  • the punch member which is 85 is used.
  • the sheet surface preferably has a spherical shape.
  • the high-pressure fuel injection pipe having a connection head has a rear side opening angle with respect to the pipe axis in the cross-sectional shape in the pipe axis direction of the contour from the injection port side end of the fillet part of the annular flange part toward the seat surface.
  • the ratio of h to H is 0.33 ⁇ h / H ⁇ 0.85.
  • the pipe-axis-direction cross section from the end of the fillet portion of the annular flange portion toward the seat surface has a pipe-axis cross-sectional shape.
  • a rear side opening angle ⁇ with respect to the shaft has an inner diameter portion of 0 ° ⁇ ⁇ 20 °, preferably 0 ° ⁇ ⁇ 15 °;
  • FIG. 8 is a process diagram showing a first embodiment of a method for manufacturing a high-pressure fuel injection pipe using the punch member shown in FIG. 7. It is a processing-process figure which similarly shows 2nd Example of the manufacturing method of a high pressure fuel injection pipe.
  • FIG. 9 is a partial cross-sectional view of a connection head in a method of manufacturing a high-pressure fuel injection pipe using a punch member having substantially the same cross-sectional structure as the punch member shown in FIG. 7, (a) is a partial cross-sectional view showing a state during molding; (B) is a fragmentary sectional view which shows the state at the time of shaping
  • FIG. 9 is a schematic view showing a high-pressure fuel injection pipe corresponding to Example 5 in the same manner.
  • FIG. 10 is a schematic view showing a high-pressure fuel injection pipe corresponding to the eighth embodiment.
  • FIG. 10 is a schematic view showing a high-pressure fuel injection pipe corresponding to Example 9 in the same manner. It is a figure which shows the relationship between back side opening angle (theta) and the pocket part distortion of Examples 1-4 of this invention, and Comparative Examples 1-3.
  • FIG. 6 is a graph showing the relationship between h / H and pocket distortion in Examples 5 to 9 and Comparative Examples 4 and 5 in the same manner. It is a vertical side view which shows an example of the connection head of the conventional high pressure fuel injection pipe made into the object of this invention.
  • the outline of the cylindrical surface extending from the injection port side end of the fillet portion of the annular flange portion toward the seat surface is rearward with respect to the tube axis in the cross-sectional shape in the tube axis direction.
  • the cylindrical surface in which the side opening angle ⁇ is 0 ° ⁇ ⁇ 20 ° is because the movement of the tube flowing substantially vertically along the wall surface is also exerted on the inner peripheral wall of the tube during molding. This is to reduce the increase in volume and molding distortion.
  • the reason why the rear opening angle ⁇ of the cylindrical surface in the cross-sectional shape in the tube axis direction is set to 20 ° or less is that when the angle exceeds 20 °, the volume of the pocket portion and the molding distortion that is a cause of wrinkles in the pocket portion are caused.
  • the profile of the cross section in the tube axis direction toward the seat surface of the connection head becomes wider forward, and the volume of the pocket portion and the molding distortion that causes wrinkles in the pocket portion increase. This is because it becomes impossible to reduce this.
  • the rear side opening angle ⁇ is preferably 0 ° ⁇ ⁇ 15 °.
  • the ratio of the tube axis direction length h of the substantially vertical part to the tube axis direction length H from the connection head end to the end of the fillet part on the annular flange part side of the cylindrical surface part is 0.33 ⁇ If h / H ⁇ 0.85, if h / H is less than 0.33, it will not be possible to reduce the volume of the pocket part and the increase in molding distortion that is a factor causing wrinkles in the pocket part. On the other hand, if h / H exceeds 0.85, the sealing surface cannot be secured.
  • an outline of an inner diameter portion of the fillet portion of the annular flange portion of the connection head from the injection port side end toward the seat surface In the cross-sectional shape in the tube axis direction, as described above, the cylindrical surface in which the rear side opening angle ⁇ with respect to the tube axis is 0 ° ⁇ ⁇ 20 ° is substantially vertical along the wall surface during head molding. This is because the movement of the pipe wall flowing in the pipe is also exerted on the inner peripheral wall portion of the pipe to reduce the volume of the pocket portion and the molding distortion that is a factor causing wrinkles in the pocket portion.
  • the reason why the rearward opening angle ⁇ of the cylindrical surface in the cross section in the tube axis direction is set to 20 ° or less is the same as the above, because the volume of the pocket portion and the pocket portion are wrinkled when it exceeds 20 °. Molding that causes a certain molding distortion, and on the other hand, if it is less than 0 °, the profile of the cross section in the tube axis direction toward the seat surface of the connecting head becomes wider forward, and this is a factor that causes the pocket volume and wrinkles in the pocket. This is because the increase in distortion cannot be reduced. Also in the method of the present invention, the rear side opening angle ⁇ is preferably 0 ° ⁇ ⁇ 15 °.
  • the ratio of the tube axis direction length h of the cylindrical surface part to the tube axis direction length H from the connecting head end to the end of the fillet part on the annular flange part side of the cylindrical surface part is 0.33 ⁇
  • the reason why h / H ⁇ 0.85 is that when h / H is less than 0.33, the volume of the pocket portion and the molding distortion that is a factor causing wrinkles in the pocket portion are reduced as described above.
  • h / H exceeds 0.85, the sealing surface cannot be secured.
  • the contour of the cross section in the tube axis direction of the cylindrical surface portion is not necessarily linear, and may have a curved shape that is slightly convex outward due to a springback phenomenon during molding.
  • FIG. 1 is a longitudinal side view showing a first embodiment of a high pressure fuel injection pipe according to the present invention
  • FIG. 2 is a longitudinal side view showing a second embodiment of the high pressure fuel injection pipe
  • FIG. FIG. 4 is a longitudinal side view showing the fourth embodiment of the high-pressure fuel injection pipe
  • FIG. 5 is a longitudinal side view showing the fifth embodiment of the high-pressure fuel injection pipe.
  • FIG. 7 is a longitudinal side view showing a sixth embodiment of the high-pressure fuel injection pipe
  • FIG. 7 is an enlarged vertical side view showing an embodiment of a punch member used for manufacturing the high-pressure fuel injection pipe according to the present invention
  • FIG. FIG. 9 is a machining process diagram showing a second embodiment of the manufacturing method of the high-pressure fuel injection pipe
  • 10 is a machining process diagram showing the second embodiment of the manufacturing method of the high-pressure fuel injection pipe.
  • I a high pressure fuel using a punch member having substantially the same cross-sectional structure as the punch member shown in FIG.
  • It is a fragmentary sectional view of the connection head in the manufacturing method of an injection pipe
  • (a) is a fragmentary sectional view showing the state in the middle of fabrication
  • (b) is a fragmentary sectional view showing the state at the time of completion of molding
  • 1 is thick
  • 2 is a connection head
  • 3 is a spherical seat surface (pressing seat surface)
  • 4 and 4 ′ are cylindrical surfaces having a predetermined opening angle ⁇ on the rear side in the cross-sectional shape in the tube axis direction
  • 5 is a fillet part
  • 6 is an annular flange part
  • 7 is a mating part
  • 7 a is a seat surface (pressure receiving seat surface)
  • 8 is a washer (sleeve
  • the thick thin steel pipe 1 has a pipe diameter of 6 mm to 10 mm and a wall thickness t of 1.25 mm to 3 made of a steel material such as stainless steel, trip steel, carbon steel for high pressure piping, alloy steel, etc. cut to a predetermined size in advance. It consists of a relatively thin and thick steel pipe of about 5 mm.
  • the high pressure fuel injection pipe of the first embodiment shown in FIG. 1 has a conical seat surface 3 (pressing seat surface) with an outer peripheral surface facing a mating seat portion at the connection end of the thick thin steel tube 1.
  • An annular flange portion 6 spaced from the seat surface 3 in the tube axis direction, and a sheet from the injection port side end portion 5-1 of the fillet portion 5 of the annular flange portion 6 connected to the seat surface 3.
  • the contour of the cross section in the tube axis direction toward the surface 3 has a cylindrical surface 4 whose rear side opening angle ⁇ with respect to the tube axis is 0 ° ⁇ ⁇ 20 ° in the cross section shape in the tube axis direction, and the cylindrical surface
  • the ratio of the length h of 4 parts to the length H of the pipe axis from the connecting head end to the end of the fillet part of the cylindrical surface 4 on the annular flange part side is 0.33 ⁇ h / While satisfying the condition of H ⁇ 0.85, the molding distortion, which is a factor causing wrinkles on the inner peripheral surface, is small, and the volume is also small. Having a connection head 2 only pocket does not exist.
  • the washer 8 is tightly or loosely fitted to the lower part of the neck of the annular flange portion 6 by means such as caulking.
  • the contact surface 8-1 of the tightening nut 9 of the washer 8 is a flat surface, a conical surface, or a spherical surface. Further, the contact surface of the annular flange portion 6 with the washer 8 may be a flat surface perpendicular to the tube axis or a conical surface whose diameter decreases toward the rear of the tube shaft.
  • the high-pressure fuel injection pipes of the second to fifth embodiments shown in FIGS. 2 to 5 are examples of a washerless type and a general washer type, and are structurally similar to those shown in FIG.
  • an outer peripheral surface is a frustoconical seat surface 3 (pressing seat surface) to the mating seat, and an annular flange provided at a distance from the seat surface 3 in the tube axis direction.
  • the section of the tube axis direction crossing from the injection port side end portion 5-1 of the fillet portion 5 of the annular flange portion 6 to the seat surface 3 is connected to the seat surface 3 in the tube axis direction cross section.
  • the ratio of the length H in the tube axis direction to the end of the fillet portion on the annular flange portion side of the 4 shaped surface portion is 0.3.
  • connection head 2 of ⁇ h / H ⁇ 0.85.
  • the high pressure fuel injection pipe shown in FIG. 2 has a washerless type connection head having a conical surface (tapered surface) whose rear surface 6a of the annular flange portion 6 has a diameter reduced to the rear of the tube axis. 3.
  • the high-pressure fuel injection pipe shown in FIG. 4 is a general washer-type high-pressure fuel injection pipe in which a normal washer 8 is closely or loosely fitted to the lower part of the neck of the annular flange portion 6 by means such as caulking.
  • Each of the high pressure fuel injection pipes is an example of a back spherical washer type high pressure fuel injection pipe using a washer 8 having a spherical contact surface 8a with the tightening nut 9.
  • the high-pressure fuel injection pipe of the sixth embodiment shown in FIG. 6 is except that the cylindrical surface 4 ′ of the cylindrical surface 4 section has a cylindrical surface 4 ′ having an arc shape that is convex outward.
  • the high-pressure fuel injection pipes of the second to fifth embodiments shown in FIGS. 1 to 5 are substantially the same.
  • the fact that the outline of the cross section in the tube axis direction of the cylindrical surface 4 ′ has an arc shape that is slightly convex outward is due to the springback phenomenon at the time of forming the connection head as described above. .
  • the high pressure fuel injection pipes of the first to sixth embodiments shown in FIGS. 1 to 6 of the present invention are punched from the outside to the end of the thick thin steel pipe 1 having a relatively small diameter as described above.
  • the connecting head having the outer peripheral surface as the frustoconical or frusto-circular arc-shaped seat surface 3 to the mating seat portion is bent and formed.
  • Cylindrical surface 4 having a rear side opening angle ⁇ of 0 ° ⁇ ⁇ 20 ° and satisfying a condition of 0.33 ⁇ h / H ⁇ 0.85, and a frustoconical with the outer peripheral surface facing the mating seat Flat portion 11-1, arc-shaped portion corresponding to each of a sheet surface (pressing seat surface) 3 having a circular or truncated arc shape 1-2, the contour of the cross section in the tube axis direction is the cross section shape in the tube axis direction, the rear side opening angle ⁇ with respect to the tube axis is 0 ° ⁇ ⁇ 20 °, and 0.33 ⁇ h / H ⁇ 0.85
  • the structure has an inner diameter portion 11-3, a conical surface or an arc-shaped surface 11-4, and a cored bar portion 11-5 that satisfies the above condition.
  • the washer 8 (FIG. 9) is separated from the chuck 10 on the thick thin steel pipe 1 which is cut to a specified product length and the opening end portion is chamfered.
  • the head machining allowance W is left and held by the chuck 10 in this state, and the tip of the steel pipe is pressed in the axial direction by the punch member 11 in this state.
  • the head machining allowance W portion of the thick-walled thin steel pipe 1 is plastically flowed, and at the tip of the steel pipe, the outer peripheral surface is a frustoconical sheet surface 3 (pressing seat surface) to the mating seat. ), An annular flange portion 6 provided at a distance from the seat surface 3 in the tube axis direction, and an end portion on the injection port side of the innermost fillet portion 5 of the annular flange portion 6 connected to the seat surface 3.
  • the contour of the cross section in the tube axis direction from 5-1 to the seat surface 3 is the cross section shape in the tube axis direction, the rear side opening angle ⁇ with respect to the tube axis is 0 ° ⁇ ⁇ 20 °, and 0.33 ⁇ h
  • a connecting head 2 composed of the cylindrical surface 4 satisfying the condition of /H ⁇ 0.85 is formed.
  • the washer 8 is moved to the lower part of the neck of the connection head 2 and fitted.
  • a washer 8 is incorporated in advance at the tip end side of the thick thin steel pipe 1 leaving the head machining allowance W of the connecting head, and thereafter the vicinity of the end of the steel pipe is chucked. It is a method of press molding in a state of being held at 10 ', and it is connected to the end of the steel pipe 1 in advance at the end of the thick thin steel pipe 1 cut to a specified product length and chamfered at the open end.
  • the washer 8 is assembled while leaving the head machining allowance W of the part, and then the tip of the steel pipe is pressed in the axial direction by the punch member 11 with the steel pipe held by the chuck 10 ′.
  • the portion of the head machining allowance L of the thick-walled thin steel pipe 1 is plastically flowed, and at the tip of the steel pipe, the outer peripheral surface is a frustoconical seat surface 3 (pressing seat surface) to the mating seat. ), An annular flange portion 6 provided at a distance from the seat surface 3 in the tube axis direction, and an end portion on the injection port side of the innermost fillet portion 5 of the annular flange portion 6 connected to the seat surface 3.
  • the contour of the cross section in the tube axis direction from 5-1 to the seat surface 3 is the cross section shape in the tube axis direction, the rear side opening angle ⁇ with respect to the tube axis is 0 ° ⁇ ⁇ 20 °, and 0.33 ⁇ h
  • a connecting head 2 composed of the cylindrical surface 4 satisfying the condition of /H ⁇ 0.85 is formed.
  • the flat part 11-1, the arcuate part 11-2 of the punch member, and the profile of the cross section in the tube axis direction have a rear side opening angle ⁇ with respect to the tube axis in the cross section of the tube axis direction.
  • Punch having 0 ° ⁇ ⁇ 20 ° and inner diameter portion 11-3, conical or arcuate surface 11-4 satisfying the condition of 0.33 ⁇ h / H ⁇ 0.85 and a cored bar portion
  • the profile of the cross section in the tube axis direction of the punch member 11 is the cross section of the tube axis direction, and the rear side opening angle ⁇ with respect to the tube axis is 0 ° ⁇ ⁇ 20 °. And 0.33 ⁇ h / H ⁇ 0.85
  • the movement of the inner wall 11-3 (four parts of the cylindrical surface) is caused by the movement of the inner wall 11-3 (cylindrical surface 4 parts).
  • the volume of the pocket portion P and the molding distortion that causes wrinkles in the pocket portion can be reduced. Become.
  • Examples of the present invention are shown below. Of Examples 1 to 4, Examples 1 and 2 are examples in which the high-pressure fuel injection pipe shown in FIGS. 11 and 12 is used (Example 3 is not shown).
  • the ratio (h / H) of the tube axis direction length h of the cylindrical surface to the tube axis direction length H from the connecting head end to the end of the cylindrical surface portion on the annular flange portion side is constant (0.5).
  • 4 shows the case where the rear side opening angle ⁇ of the contour of the cross section in the tube axis direction of the cylindrical surface portion is variously changed, and Example 4 is similar to Examples 1 to 3 in the tube axis direction of the cylindrical surface of the connecting head.
  • the ratio (h / H) of the length h and the length H in the tube axis direction from the connecting head end to the end of the cylindrical surface portion on the annular flange portion side is constant (0.5), and the cylindrical surface portion A case where a high-pressure fuel injection pipe in which the rear side opening angle ⁇ of the contour of the pipe axis direction cross section is changed is shown.
  • Fig. 13 Of the fifth to ninth embodiments, the fifth, eighth, and ninth embodiments are examples in which the high-pressure fuel injection pipe shown in FIGS. 14 to 16 is used, respectively, and the profile of the cylindrical surface section in the tube axis direction.
  • the opening angle ⁇ of the rear side of the tube is constant (15 °), and the tube axis direction length h of the cylindrical surface of the connection head and the end of the fillet portion on the annular flange portion side of the cylindrical surface portion from the connection head end
  • the ratios (h / H) of the length H in the tube axis direction are variously changed.
  • Examples 6 and 7 are rearward of the profile of the cross section in the tube axis direction of the cylindrical surface portion as in Examples 5, 8 and 9.
  • the side opening angle ⁇ is constant (15 °), the tube axial length h of the cylindrical surface of the connection head and the tube from the connection head end to the end of the fillet portion on the annular flange portion side of the cylindrical surface portion
  • a high-pressure fuel injection pipe (not shown) in which the ratio (h / H) of the axial length H is variously changed is used will be described.
  • the tube axis direction length h of the cylindrical surface of the connecting head and the tube axis direction length H from the connection head end to the end of the cylindrical surface portion on the annular flange side are as follows.
  • a thick thin steel tube (t / D 0.27) (material: equivalent to DIN ST52) having a tube diameter D of 9.0 mm, a tube inner diameter Din of 4.0 mm, and a wall thickness t of 2.5 mm is used.
  • a high-pressure fuel injection pipe having a connection head shown in FIG. 11 was manufactured by a molding method similar to the head molding method shown in FIG.
  • the pocket (annular recess) in the inner peripheral surface of the connecting head was as small as 0.85.
  • a thick thin steel tube (t / D 0.27) (material: equivalent to DIN ST52) having a tube diameter D of 9.0 mm, a tube inner diameter Din of 4.0 mm, and a wall thickness t of 2.5 mm is used.
  • a high-pressure fuel injection pipe having a connection head shown in FIG. 12 was manufactured by a molding method similar to the head molding method shown in FIG.
  • the amount of distortion is 0. It was a very small value of .84.
  • a thick thin steel tube (t / D 0.27) (material: equivalent to DIN ST52) having a tube diameter D of 9.0 mm, a tube inner diameter Din of 4.0 mm, and a wall thickness t of 2.5 mm is used.
  • a high-pressure fuel injection pipe (not shown) having a connection head was manufactured by a molding method similar to the head molding method shown in FIG.
  • the amount of distortion is 0. It was a very small value of .83.
  • a thick thin steel tube (t / D 0.27) (material: equivalent to DIN ST52) having a tube diameter D of 9.0 mm, a tube inner diameter Din of 4.0 mm, and a wall thickness t of 2.5 mm is used.
  • a high pressure fuel injection pipe having a connection head shown in FIG. 13 was manufactured by a molding method similar to the head molding method shown in FIG.
  • a thick thin steel tube (t / D 0.27) (material: equivalent to DIN ST52) having a tube diameter D of 9.0 mm, a tube inner diameter Din of 4.0 mm, and a wall thickness t of 2.5 mm is used. Except for the punch member shown in FIG. 8 and the rear opening angle ⁇ of the inner diameter portion 11-3, substantially the same punch member is used, and a connection head substantially the same as that of the first embodiment is formed by a molding method similar to the head molding method shown in FIG. A high-pressure fuel injection pipe having the above was manufactured.
  • a thick thin steel tube (t / D 0.27) (material: equivalent to DIN ST52) having a tube diameter D of 9.0 mm, a tube inner diameter Din of 4.0 mm, and a wall thickness t of 2.5 mm is used. Except for the punch member shown in Fig. 8 and the rear opening angle ⁇ of the inner diameter portion 11-3, substantially the same punch member is used, and a connection head substantially the same as that in Example 2 is formed by a molding method similar to the head molding method shown in Fig. 8. A high-pressure fuel injection pipe having the above was manufactured.
  • a thick thin steel tube (t / D 0.27) (material: equivalent to DIN ST52) having a tube diameter D of 9.0 mm, a tube inner diameter Din of 4.0 mm, and a wall thickness t of 2.5 mm is used. Except for the punch member shown in Fig. 8 and the rear opening angle ⁇ of the inner diameter portion 11-3, substantially the same punch member is used, and a connection head substantially the same as that in Example 2 is formed by a molding method similar to the head molding method shown in Fig. 8. A high-pressure fuel injection pipe having the above was manufactured.
  • a thick thin steel tube (t / D 0.27) (material: equivalent to DIN ST52) having a tube diameter D of 9.0 mm, a tube inner diameter Din of 4.0 mm, and a wall thickness t of 2.5 mm is used.
  • a punching method similar to the head forming method shown in FIG. 8 is used except for the punch member shown in FIG. 8 and the axial length of the inner diameter portion 11-3 and the conical or arcuate surface 11-4 in the tube axis direction.
  • a high-pressure fuel injection pipe having a connection head shown in FIG. 14 was manufactured.
  • a punching method similar to the head forming method shown in FIG. 8 is used except for the punch member shown in FIG. 8 and the axial length of the inner diameter portion 11-3 and the conical or arcuate surface 11-4 in the tube axis direction.
  • Manufactured a high-pressure fuel injection pipe (not shown) having a connection head.
  • a punching method similar to the head forming method shown in FIG. 8 is used except for the punch member shown in FIG. 8 and the axial length of the inner diameter portion 11-3 and the conical or arcuate surface 11-4 in the tube axis direction.
  • Manufactured a high-pressure fuel injection pipe (not shown) having a connection head.
  • the amount of distortion is 0. It was a very small value of .84.
  • a thick thin steel tube (t / D 0.27) (material: equivalent to DIN ST52) having a tube diameter D of 9.0 mm, a tube inner diameter Din of 4.0 mm, and a wall thickness t of 2.5 mm is used.
  • a punching method similar to the head forming method shown in FIG. 8 is used except for the punch member shown in FIG. 8 and the axial length of the inner diameter portion 11-3 and the conical or arcuate surface 11-4 in the tube axis direction.
  • the amount of distortion is 0. It was a very small value of .833.
  • a thick thin steel tube (t / D 0.27) (material: equivalent to DIN ST52) having a tube diameter D of 9.0 mm, a tube inner diameter Din of 4.0 mm, and a wall thickness t of 2.5 mm is used.
  • a punching method similar to the head forming method shown in FIG. 8 is used except for the punch member shown in FIG. 8 and the axial length of the inner diameter portion 11-3 and the conical or arcuate surface 11-4 in the tube axis direction.
  • a high-pressure fuel injection pipe having a connection head shown in FIG. 16 was manufactured.
  • a thick thin steel tube (t / D 0.27) (material: equivalent to DIN ST52) having a tube diameter D of 9.0 mm, a tube inner diameter Din of 4.0 mm, and a wall thickness t of 2.5 mm is used.
  • a punching method similar to the head forming method shown in FIG. 8 is used except for the punch member shown in FIG. 8 and the axial length of the inner diameter portion 11-3 and the conical or arcuate surface 11-4 in the tube axis direction.
  • a high-pressure fuel injection pipe (not shown) having a connection head almost the same as in Example 2 was manufactured.
  • a thick thin steel tube (t / D 0.27) (material: equivalent to DIN ST52) having a tube diameter D of 9.0 mm, a tube inner diameter Din of 4.0 mm, and a wall thickness t of 2.5 mm is used.
  • a punching method similar to the head forming method shown in FIG. 8 is used except for the punch member shown in FIG. 8 and the axial length of the inner diameter portion 11-3 and the conical or arcuate surface 11-4 in the tube axis direction.
  • a high-pressure fuel injection pipe (not shown) having a connection head almost the same as in Example 1 was manufactured.
  • the amount of distortion is 1 .14, a very high value.
  • the innermost fillet part of the annular flange part has a profile extending from the injection port side end part toward the seat surface, and the rear side opening angle ⁇ is 0 to 20 in the cross section of the pipe axis direction.
  • the movement to be increased becomes greater as the axial length of the cylindrical surface portion becomes longer, and it becomes possible to reduce the increase in volume and molding distortion of the pocket portion.
  • the fear of the occurrence of cracks due to cavitation erosion due to pressure, and the increase in inner diameter due to the formation of the pocket and the increase in tensile stress of the inner surface due to stress concentration during the molding of the head, and the inner circumference of the connecting head A high-quality high-pressure fuel injection pipe capable of greatly reducing the possibility that the surface becomes the starting point of fatigue failure can be manufactured.
  • the present invention is not limited to a high-pressure fuel injection pipe that is frequently used as a fuel supply path in a diesel internal combustion engine, but also various high-pressure metal pipes having a connecting head made of a thick steel pipe having a relatively small diameter. Applicable and industrial value is extremely large.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)
PCT/JP2010/055101 2009-03-24 2010-03-24 接続頭部を有する高圧燃料噴射管およびその製造方法 Ceased WO2010110324A1 (ja)

Priority Applications (4)

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US13/256,347 US20120006298A1 (en) 2009-03-24 2010-03-24 High-pressure fuel injection pipe having connection head portion, and manufacturing method thereof
ES10756120T ES2714679T3 (es) 2009-03-24 2010-03-24 Tubería de inyección de combustible de alta presión que tiene una parte de cabezal de conexión, y método para su fabricación
EP10756120.1A EP2412967B1 (en) 2009-03-24 2010-03-24 High-pressure fuel injection tube having connection head and method for producing the same
CN201080009119.5A CN102333951B (zh) 2009-03-24 2010-03-24 具有连接头部的高压燃料喷射管及其制造方法

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JP2009072792A JP5455013B2 (ja) 2009-03-24 2009-03-24 接続頭部を有する高圧燃料噴射管およびその製造方法
JP2009-072792 2009-03-24

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JP2013212531A (ja) * 2012-04-04 2013-10-17 Denso Corp かしめ結合方法およびかしめ結合構造
WO2016045419A1 (zh) * 2014-09-24 2016-03-31 广东华液动力科技有限公司 硬管管接头、接管加工装置及接管加工方法
USD873390S1 (en) * 2015-04-20 2020-01-21 Sanoh Industrial Co., Ltd. High-pressure fuel line
JP2016217323A (ja) * 2015-05-26 2016-12-22 三桜工業株式会社 燃料配管の接続頭部及び燃料配管
JP2017106383A (ja) * 2015-12-10 2017-06-15 日立オートモティブシステムズ株式会社 インジェクタ及び燃料レールアッセンブリ
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ES2714679T3 (es) 2019-05-29
EP2412967B1 (en) 2018-12-19
EP2412967A4 (en) 2014-01-22
CN102333951A (zh) 2012-01-25
US20120006298A1 (en) 2012-01-12
JP5455013B2 (ja) 2014-03-26
EP2412967A1 (en) 2012-02-01
CN102333951B (zh) 2014-05-07
KR20110128945A (ko) 2011-11-30
JP2010223139A (ja) 2010-10-07

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