WO2013145612A1 - グロープラグ及びその製造方法 - Google Patents
グロープラグ及びその製造方法 Download PDFInfo
- Publication number
- WO2013145612A1 WO2013145612A1 PCT/JP2013/001751 JP2013001751W WO2013145612A1 WO 2013145612 A1 WO2013145612 A1 WO 2013145612A1 JP 2013001751 W JP2013001751 W JP 2013001751W WO 2013145612 A1 WO2013145612 A1 WO 2013145612A1
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- WO
- WIPO (PCT)
- Prior art keywords
- end side
- housing
- rear end
- glow plug
- screw
- 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
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P19/00—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition
- F02P19/02—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs
- F02P19/026—Glow plug actuation during engine operation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23Q—IGNITION; EXTINGUISHING-DEVICES
- F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
- F23Q7/001—Glowing plugs for internal-combustion engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P19/00—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23Q—IGNITION; EXTINGUISHING-DEVICES
- F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P19/00—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition
- F02P19/02—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P19/00—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition
- F02P19/02—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs
- F02P19/021—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs characterised by power delivery controls
- F02P19/022—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs characterised by power delivery controls using intermittent current supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P19/00—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition
- F02P19/02—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs
- F02P19/025—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs with means for determining glow plug temperature or glow plug resistance
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23Q—IGNITION; EXTINGUISHING-DEVICES
- F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
- F23Q7/001—Glowing plugs for internal-combustion engines
- F23Q2007/004—Manufacturing or assembling methods
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- 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
- Y10T29/49002—Electrical device making
- Y10T29/49082—Resistor making
- Y10T29/49083—Heater type
-
- 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
- Y10T29/49826—Assembling or joining
- Y10T29/49908—Joining by deforming
- Y10T29/49925—Inward deformation of aperture or hollow body wall
- Y10T29/49934—Inward deformation of aperture or hollow body wall by axially applying force
Definitions
- the present invention relates to a glow plug used for preheating a diesel engine and the like and a method for manufacturing the same.
- a glow plug used for starting assistance in an internal combustion engine such as a diesel engine includes a cylindrical housing, a heater member that generates heat when energized, and the like.
- the heater member may be a ceramic heater having a heating element made of conductive ceramic or a sheath heater having a heating coil.
- the housing includes a screw portion for attachment to the internal combustion engine, a tool engagement portion to which a predetermined tool is engaged when attached to the internal combustion engine, and a screw portion that is screwed into the attachment hole of the internal combustion engine. And a pressure-contact portion for pressing against a seat surface provided in the internal combustion engine and ensuring airtightness in the combustion chamber.
- a cylindrical tip side barrel is provided between the screw portion and the pressure contact portion, and in a state where the glow plug is attached to the internal combustion engine, a compressive force (axial) is applied to the tip side barrel in the axial direction. Power).
- a cylindrical rear end side barrel portion may be provided between the screw portion and the tool engaging portion, and when the glow plug is attached to the internal combustion engine using a tool, the rear end side barrel portion is surrounded by the peripheral portion. A force (torsional stress) along the direction is applied (see, for example, Patent Document 1).
- the housing thin and reduce the weight of the housing.
- the housing is simply thin, the mechanical strength of the front end side barrel portion and the rear end side barrel portion may be reduced. As a result, buckling deformation due to application of the axial force occurs in the front end side body, and twisting deformation due to the torsional stress may occur in the rear end side body.
- the present invention has been made in view of the above circumstances, and an object thereof is to more reliably prevent deformation of the front end side body portion and the rear end side body portion even when the housing is made relatively thin. It is an object of the present invention to provide a glow plug and a method of manufacturing the same.
- the glow plug of this configuration has a cylindrical housing having an axial hole extending in the axial direction, and having a screw portion for screwing into an attachment hole of the internal combustion engine on the outer peripheral surface;
- the housing is A pressure contact portion that presses against a seating surface of the internal combustion engine when the screw portion is screwed into the mounting hole of the internal combustion engine;
- a cylindrical tip body provided between the pressure contact portion and the screw portion;
- the wall thickness of the tip side trunk is When the screw diameter of the thread portion is M12, it is 1.6 mm or less, When the screw diameter of the thread portion is M10, M9, or M8, it is 0.9 mm or less,
- the distal end side body portion is provided with a plurality of convex or concave distal end side reinforcing portions extending along the axial direction intermittently along the circumferential direction of the
- the phrase “extends along the axial direction” not only strictly refers to the case where the tip side reinforcing portion extends along the axial direction, but the tip side reinforcing portion slightly (for example, a cylindrical tip)
- the angle between the extending direction of the front end side reinforcing portion in the unfolded front end body and the axis is an angle of about 5 ° or less.
- the glow plug of this configuration is the above configuration 1, wherein the housing is A tool engaging portion that is provided on a rear end side with respect to the screw portion, and in which a tool is engaged when attached to the internal combustion engine; A cylindrical rear end body provided between the tool engaging portion and the screw portion; The wall thickness of the rear end side trunk is When the screw diameter of the thread portion is M12, it is 1.6 mm or less, When the screw diameter of the thread portion is M10, M9, or M8, it is 0.9 mm or less, The rear end side body portion is provided with a plurality of rear end side reinforcing portions having a convex shape or a concave shape extending along the axial direction intermittently along the circumferential direction of the housing.
- the glow plug of this configuration has the holding portion that holds the heater member on the inner periphery thereof in the configuration 1 or 2 described above,
- the front end side reinforcing portion is provided on the rear end side with respect to the holding portion.
- the glow plug of this configuration has a cylindrical housing having an axial hole extending in the axial direction, and having a screw portion for screwing into an attachment hole of the internal combustion engine on the outer peripheral surface;
- the housing is A tool engaging portion that is provided on a rear end side with respect to the screw portion, and in which a tool is engaged when attached to the internal combustion engine;
- a cylindrical rear end body provided between the tool engaging portion and the screw portion;
- the wall thickness of the rear end side trunk is When the screw diameter of the thread portion is M12, it is 1.6 mm or less, When the screw diameter of the threaded portion is M10, M9, or M8, it is 0.9 mm or less, and the rear end side body portion has a convex or concave shape extending along the axial direction.
- a plurality of reinforcing portions are provided intermittently along the circumfer
- a method for manufacturing a glow plug of this configuration is the method for manufacturing a glow plug according to any one of the above configurations 1 to 4, Including a housing forming step of forming the housing;
- the housing forming step includes a step of forming a cylindrical housing intermediate body to be the housing by deep drawing a plate-like metal material.
- the thickness of the front end body portion is 1.6 mm or less when the screw diameter of the screw portion is M12, and the screw diameter of the screw portion is M10, M9, or M8. In some cases, it is 0.9 mm or less. Therefore, it is possible to reduce the weight of the distal end body portion and the housing. As a result, it is possible to improve fuel efficiency and reduce manufacturing costs.
- the distal end side body portion is provided with a plurality of intermittently extending distal end side reinforcing portions extending along the axial direction along the circumferential direction of the housing. . Therefore, the mechanical strength of the front end side body portion can be remarkably increased. As a result, it is possible to more reliably prevent the distal end side body portion from being deformed by the axial force.
- the thickness of the rear end body portion is 1.6 mm or less when the screw diameter of the screw portion is M12, and the screw diameter of the screw portion is M10, M9, or M8. Is 0.9 mm or less. Therefore, the weight of the rear end side body portion can be reduced, and the weight of the front end side body portion can be reduced by the configuration 1, and the housing can be further reduced in weight. As a result, improvement in fuel efficiency and reduction in manufacturing cost can be realized more effectively.
- the rear end side body portion is provided with a plurality of rear end side reinforcing portions having a convex shape or a concave shape extending along the axial direction intermittently along the circumferential direction of the housing. ing. Accordingly, the mechanical strength of the rear end side body portion can be remarkably increased, and the rear end side body portion has a sufficient torsional resistance against the torsional stress. As a result, it is possible to more reliably prevent the rear end body portion from being deformed by the torsional stress.
- the front end side reinforcing portion is provided on the rear end side of the holding portion that holds the heater member. That is, the distal end side reinforcing portion is provided at a position away from the holding portion. Therefore, the inner periphery of the holding portion can be more reliably adhered to the heater member, and excellent airtightness can be ensured between the two. As a result, good airtightness can be ensured in the combustion chamber.
- the thickness of the rear end body portion is 1.6 mm or less when the screw diameter of the screw portion is M12, and the screw diameter of the screw portion is M10, M9, or M8. Is 0.9 mm or less. Therefore, it is possible to reduce the weight of the rear end side body portion and thus the housing. As a result, it is possible to improve fuel efficiency and reduce manufacturing costs.
- drum is provided with the back end side reinforcement part which makes the convex shape or concave shape extended along an axial direction intermittently along the circumferential direction of a housing. Yes. Therefore, the mechanical strength of the rear end side barrel can be remarkably increased, and deformation of the rear end side barrel due to torsional stress can be prevented more reliably.
- the housing intermediate body to be the housing is manufactured by deep drawing. Therefore, a lightweight housing that is thin overall can be manufactured more easily, and productivity can be improved.
- the housing can be made thin as a whole, the housing can be further reduced in weight. As a result, it is possible to further enhance operational effects such as improvement in fuel efficiency and reduction in manufacturing cost.
- A is a perspective view of a metal material
- (b) to (d) are front views showing a transition of a shape change of the metal material by deep drawing
- e shows a housing intermediate body.
- A is a partially broken front view showing a die and a punch used when forming a tool engaging portion
- (b) is a partially broken front view showing a die or the like in which a housing intermediate body is arranged. It is.
- (A) is a partially broken front view which shows one process of the formation process of a tool engaging part
- (b) is a front view which shows the housing intermediate body in which the tool engaging part was formed. It is a front view which shows the structure of the glow plug in another embodiment. It is a front view which shows the structure of the glow plug in another embodiment. It is a partially broken front view which shows the structure of the glow plug in another embodiment.
- FIG. 1 is a front view of the glow plug 1
- FIG. 2 is a partially cutaway front view of the glow plug 1. 1 and the like, the direction of the axis CL1 of the glow plug 1 will be described as the vertical direction in the drawing, the lower side will be described as the front end side of the glow plug 1, and the upper side will be described as the rear end side. *
- the glow plug 1 includes a cylindrical housing 2 and a heater member 3 attached to the housing 2. *
- the housing 2 is made of a predetermined metal (for example, carbon steel or stainless steel) and has a shaft hole 4 penetrating in the direction of the axis CL1. Further, the outer peripheral surface of the housing 2 has a threaded portion 5 for screwing into a mounting hole of an internal combustion engine such as a diesel engine, and a hexagonal cross section for engaging a tool such as a torque wrench when mounted on the internal combustion engine. A tool engaging portion 6 having a shape is formed. In the present embodiment, the screw diameter of the screw portion 5 is M12. The inner periphery of the tool engaging portion 6 has a hexagonal cross section following the outer peripheral shape of the tool engaging portion 6.
- the housing 2 is provided with a pressure contact portion 7 that is in pressure contact with a seating surface (not shown) of the internal combustion engine when the screw portion 5 is screwed into the mounting hole at the distal end portion.
- a pressure contact portion 7 is in pressure contact with the seating surface, good airtightness can be ensured in the combustion chamber.
- the housing 2 includes a cylindrical rear end side barrel portion 8 positioned between the screw portion 5 and the tool engaging portion 6, and a cylindrical front end side barrel portion 9 positioned between the press contact portion 7 and the screw portion 5.
- the front end side body portion 9 includes a holding portion 20 that holds the heater member 3 in a state where the shaft hole 4 has a minimum inner diameter and an inner peripheral surface thereof is in close contact with the heater member 3 over the entire circumference.
- the heater member 3 is fixed to the housing 2 by being press-fitted into the holding portion 20 with its own tip protruding from the tip of the housing 2.
- the holding portion 20 is configured to have the smallest outer diameter in the distal end side body portion 9. *
- the housing 2 is configured to be thin overall and have a substantially uniform thickness.
- drum 9 are each 1.6 mm or less.
- the screw diameter of the screw part 5 is M8, M9, or M10
- the thickness of the rear end side body part 8 and the thickness of the front end side body part 9 are each 0.9 mm or less.
- the thickness of the rear end side body portion 8 and the front end side body portion 9 is set to a predetermined value (for example, 0.2 mm) or more is preferable.
- the heater member 3 includes a tube 10, a heating coil 12 and a control coil 13 disposed inside the tube 10, and is connected in series with a central shaft 11 made of a predetermined metal (for example, an iron-based alloy). It is connected.
- a predetermined metal for example, an iron-based alloy
- the tube 10 is a cylindrical tube formed of a metal (for example, a nickel-based alloy or a stainless alloy) containing iron (Fe) or nickel (Ni) as a main component and having a closed end. Further, inside the tube 10, a heating coil 12 whose tip is joined to the tip of the tube 10 and a control coil 13 connected in series to the rear end of the heating coil 12 are magnesium oxide. It is enclosed with insulating powder 14 containing powder. The heating coil 12 is electrically connected to the tube 10 at the tip thereof, but the outer peripheral surface of the heating coil 12 and the control coil 13 and the inner peripheral surface of the tube 10 are insulated by the interposition of the insulating powder 14. It has become. *
- annular rubber 15 made of a predetermined rubber (for example, silicone rubber, fluorine rubber, etc.) is provided between the inner periphery of the rear end side of the tube 10 and the middle shaft 11, and the inside of the tube 10 is sealed. Has been. *
- the heating coil 12 is configured by spirally winding a resistance heating wire made of a predetermined metal (for example, an alloy containing Fe as a main component and containing Al, Cr, or the like).
- the heating coil 12 generates heat when energized through the middle shaft 11.
- the control coil 13 is made of a material having a temperature coefficient of electrical resistivity greater than that of the material of the heat generating coil 12, for example, resistance heat generation mainly composed of Co or Ni typified by cobalt (Co) -Ni-Fe alloy. It is composed of lines. Thereby, the control coil 13 increases the electric resistance value by receiving its own heat generation and heat generation from the heat generation coil 12, and controls the power supplied to the heat generation coil 12. Specifically, in the initial energization period, relatively large power is supplied to the heating coil 12, and the temperature of the heating coil 12 rises rapidly. Then, the control coil 13 is heated by the heat generation, the electric resistance value of the control coil 13 increases, and the power supplied to the heat generating coil 12 decreases.
- the temperature rise characteristic of the heater member 3 becomes a form in which, after the temperature is rapidly raised in the initial stage of energization, the supplied power is suppressed by the action of the control coil 13 and the temperature is saturated. That is, the presence of the control coil 13 is configured so that the rapid rise in temperature rise is improved, and overheating (overshoot) of the heating coil 12 is less likely to occur.
- the middle shaft 11 has a solid rod shape, and its own tip is inserted into the tube 10. Then, the middle shaft 11 and the control coil 13 are connected by resistance welding of the middle shaft 11 and the control coil 13 with the most distal end portion of the middle shaft 11 being inserted into the rear end portion of the control coil 13. .
- a cable connecting terminal pin 17 having a bottomed cylindrical shape is fixed to the rear end portion of the middle shaft 11 by caulking.
- an insulating bush 18 made of an insulating material is provided between the front end portion of the terminal pin 17 and the rear end portion of the housing 2 in order to prevent direct energization (short circuit) between them.
- an annular seal member 19 made of an insulating material is provided between the housing 2 and the middle shaft 11 so as to be in contact with the tip of the insulating bush 18 in order to improve the airtightness in the shaft hole 4. Is provided. *
- the thickness of the rear end side body portion 8 is set to 1.6 mm or less or 0.9 mm or less. Therefore, when the glow plug 1 is attached to the internal combustion engine, if a force along the circumferential direction is applied to the tool engaging portion 6, the rear end side body portion 8 may be twisted. . Further, since the thickness of the front end side body portion 9 is set to 1.6 mm or less or 0.9 mm or less, axial force is applied to the front end side body portion 9 with the attachment of the glow plug 1 (housing 2) to the internal combustion engine. When added, buckling deformation may occur in the front end side body portion 9. *
- the rear end side body portion 8 and the front end side body portion 9 are respectively as follows. It is configured. *
- the distal end side body portion 9 has a plurality of distal end side reinforcing portions 9A having a convex shape extending along the direction of the axis CL1 intermittently along the circumferential direction of the housing 2 (in this embodiment, 12 at regular intervals). Book) is provided. Further, the height of the front end side reinforcing portion 9A is set corresponding to the number of the front end side reinforcing portions 9A, and is set to 0.1 mm or more in the present embodiment. Furthermore, the length of the distal-side reinforcing portion 9A along the axis CL1 is set to be equal to or greater than a predetermined value (for example, 30% of the length of the distal-side body 9 along the axis CL1).
- a predetermined value for example, 30% of the length of the distal-side body 9 along the axis CL1.
- the rear end side body portion 8 includes a plurality of rear end side reinforcing portions 8A having a convex shape extending along the direction of the axis CL1 intermittently along the circumferential direction of the housing 2 (in this embodiment, etc. 12 are provided at intervals).
- the height of the rear end side reinforcing portion 8A is set corresponding to the number of the rear end side reinforcing portions 8A, and is set to 0.1 mm or more in the present embodiment.
- the length of the rear end side reinforcing portion 8A along the axis line CL1 is set to be equal to or greater than a predetermined value (for example, 30% of the length of the rear end side body portion 8 along the axis line CL1). *
- the front end side reinforcing portion 9 ⁇ / b> A is provided on the rear end side with respect to the holding portion 20, and is configured so that the front end side reinforcing portion 9 ⁇ / b> A does not reach the holding portion 20.
- a resistance heating wire containing Fe as a main component and containing Cr or Al is processed into a coil shape to obtain the heating coil 12. Further, the rear end portion of the heating coil 12 and the front end portion of the control coil 13 obtained by processing a resistance heating wire such as a Co—Ni—Fe alloy into a coil shape are joined by arc welding or the like. *
- the tip of the middle shaft 11, the heating coil 12 integrated with the middle shaft 11, and the control are formed in a cylindrical tube 10 that is formed with a diameter larger than the final dimension by the machining allowance and the tip is not closed.
- a coil 13 is arranged.
- the distal end portion of the tube 10 is closed by arc welding, and the distal end portion of the tube 10 and the distal end portion of the heating coil 12 are joined.
- the tube 10 is subjected to a swaging process, whereby the heater member 3 integrated with the tube 10 and the central shaft 11 is obtained.
- the housing 2 is manufactured in the housing formation step.
- a disk-shaped metal material MB made of a predetermined iron-based material is prepared, and the metal material MB is deep-drawn to form a cylinder to be the housing 2.
- a housing intermediate is obtained. Specifically, a plurality of rod-shaped punches (not shown) whose outer diameter gradually decreases, and a plurality of bottomed cylindrical dies (not shown) having an inner diameter corresponding to the outer diameter of each punch, The metal material MB is supplied to a transfer press (not shown) attached in parallel. Then, the metal material MB is formed into a cylindrical shape as shown in FIGS.
- a relatively large-diameter engaging portion corresponding portion 32 corresponding to the tool engaging portion 6 is provided at one end portion.
- a cylindrical housing intermediate 31 is obtained. Note that a portion of the housing intermediate body 31 on the tip side of the engaging portion corresponding portion 32 is formed to have a slightly larger diameter than the final dimension of the housing 2.
- a tool D1 having an outer periphery forming portion OM having a shape corresponding to the outer periphery shape of the tool engaging portion 6 on the inner periphery and a punch P1 capable of moving up and down is used.
- the engaging portion 6 is formed. More specifically, first, as shown in FIG. 4B, the housing intermediate body 31 is disposed on the inner periphery of the die D1. Then, as shown in FIG. 5A, the punch P1 is moved downward, and the engagement portion corresponding portion 32 is pushed into the outer peripheral forming portion OM of the die D1 by the punch P1. Thereby, both the outer periphery and inner periphery of the engaging part corresponding
- a portion corresponding to the distal end side body portion 9 is deformed by applying a press to the outer periphery on the distal end side of the housing intermediate body 31 in the radial direction, thereby forming the holding portion 20.
- the outer peripheral shape of the front end side reinforcing portion 9A is inserted into the housing intermediate body 31.
- 9A of front end side reinforcement parts are formed by pushing the housing intermediate body 31 with respect to the die
- the rear end side reinforcing portion 8A is formed by pushing the housing intermediate body 31 into a die (not shown) having a concave portion corresponding to the outer peripheral shape on the inner periphery.
- the threaded portion 5 is formed at a predetermined portion of the housing intermediate 31 by rolling. Further, the housing 2 is obtained by pressing the front end portion of the housing intermediate body 31 and forming the press contact portion 7 at the front end portion of the housing intermediate body 31.
- the heater member 3 is press-fitted into the holding portion 20 of the housing 2, the insulating bush 18 and the seal member 19 are arranged on the outer periphery of the rear end portion of the middle shaft 11, and a terminal pin is attached to the rear end portion of the middle shaft 11.
- the above-described glow plug 1 is obtained by caulking and fixing 17.
- the thickness of the front end side body portion 9 and the rear end side body portion 8 is 1.6 mm or less when the screw diameter of the screw portion 5 is M12,
- the screw diameter of the screw part 5 is M10, M9, or M8, it is set to 0.9 mm or less. Therefore, the weight of the housing 2 can be effectively reduced. As a result, it is possible to improve fuel efficiency and reduce manufacturing costs.
- the front end side body part 9 and the rear end side body part 8 are thin as described above, the front end side body part 9 is deformed by an axial force, and the rear end side body part 8 is deformed by a torsional stress.
- the front end side body portion 9 is provided with a plurality of front end side reinforcement portions 9A
- the rear end side body portion 8 is provided with a plurality of rear end side reinforcement portions 8A. Therefore, the mechanical strength can be significantly increased in each of the front end side body portion 9 and the rear end side body portion 8. As a result, the deformation of the front end side body portion 9 due to the axial force and the deformation of the rear end side body portion 8 due to the torsional stress can be prevented more reliably.
- the front end side reinforcing portion 9 ⁇ / b> A is provided on the rear end side with respect to the holding portion 20 that holds the heater member 3. Therefore, the inner peripheral surface of the holding portion 20 can be more closely attached to the heater member 3, and excellent airtightness can be ensured between the two. As a result, good airtightness can be ensured in the combustion chamber.
- the housing 2 is entirely thin, the housing 2 can be further reduced in weight. As a result, it is possible to further enhance operational effects such as improvement in fuel efficiency and reduction in manufacturing cost.
- the holding portion 20 is configured to have the smallest outer diameter in the distal end side body portion 9. Therefore, when an axial force is applied to the front end side body portion 9 with the attachment of the glow plug 1 to the internal combustion engine, the axial force is decomposed toward the heater member 3 side. Therefore, even if the housing 2 (front end side body portion 9) is thin as in the present embodiment, it is possible to more reliably prevent the holding force of the heater member 3 from being reduced by the holding portion 20.
- the housing intermediate body 31 to be the housing 2 is manufactured by deep drawing. Therefore, the lightweight housing 2 that is thin as a whole can be manufactured more easily, and productivity can be improved. *
- the housing 2 is configured to include both the front end side reinforcing portion 9A and the rear end side reinforcing portion 8A.
- the housing 2 may be configured to include only one of the front end side reinforcing portion 9A and the rear end side reinforcing portion 8A.
- the front end side reinforcing portion 9A and the rear end side reinforcing portion 8A are configured to have a convex shape, but the front end side reinforcing portion 9A and the rear end side reinforcing portion 8A are concave (grooves). It may be configured to form a shape. Further, it may be configured such that the convex front end side reinforcing portion and the concave front end side reinforcing portion are mixed, or the convex rear end side reinforcing portion and the concave rear end side reinforcing portion are mixed.
- the number of the front end side reinforcing portions 9A and the rear end side reinforcing portions 8A is an example, and the number of the front end side reinforcing portions 9A and the rear end side reinforcing portions 8A.
- Various changes may be made.
- the height of the front end side reinforcing portion 9A and the rear end side reinforcing portion 8A (when the front end side reinforcing portion 9A and the like are concave, The depth of the front end side reinforcing portion 9A and the like may be changed.
- the front end side reinforcing portion 9A and the rear end side reinforcing portion 8A are provided at equal intervals along the circumferential direction of the housing 2, the front end side reinforcing portion 9A and the rear end side reinforcing portion 8A
- the height (depth) may be 0.2 mm or more.
- the rear end side body portion 8 is provided between the tool engaging portion 6 and the screw portion 5, but the tool engaging portion 6 and the screw portion 5 are configured to be adjacent to each other. You may abbreviate
- control coil 13 is interposed between the heating coil 12 and the middle shaft 11 in order to prevent an excessive temperature rise of the heating coil 12, but the middle shaft 11 is brought into direct contact with the heating coil 12 for control.
- the coil 13 may be omitted.
- the heater member 3 includes the tube 10 and the heating coil 12 disposed inside the tube 10, and the technical idea of the present invention is applied to a so-called metal glow plug.
- the heater member is composed of a cylindrical base made of an insulating ceramic, and a heating element that is provided in the base and is formed of a conductive ceramic and generates heat when energized from the center shaft 11,
- the technical idea of the present invention may be applied to a so-called ceramic glow plug.
- a heater member (a so-called surface heating type heater) in which a conductive film serving as a heating element is provided on the outer surface of the substrate may be used.
- at least a part of the heat generating element may be formed of a conductive metal having excellent heat resistance (for example, an alloy containing tungsten as a main component). *
- the rear end portion (cable connection portion) of the glow plug 1 is configured such that the terminal pin 17 is caulked and fixed to the rear end portion of the middle shaft 11.
- the configuration of the rear end portion of 1 is not limited to this. Therefore, for example, a male screw is provided on the outer periphery of a portion of the middle shaft 11 protruding from the rear end of the housing 2, and a nut having a female screw on the inner periphery is screwed onto the male screw in a state of being in contact with the insulating bush 18.
- the rear end portion of the middle shaft may protrude from. That is, you may comprise so that the rear-end part of a center axis
- the middle shaft 11 has a solid rod shape.
- the hollow portion 22 may be provided inside the middle shaft 11 so that the middle shaft 11 has a cylindrical shape.
- the weight of the glow plug 1 can be further reduced, and the fuel efficiency can be further improved.
- the heater member 3 since the heat drawn from the heater member 3 (the heat generating coil 12) by the middle shaft 11 can be reduced, the heater member 3 (the heat generating coil 12) can quickly reach a predetermined temperature, and the heater member 3 can be Electric power required to reach the predetermined temperature can be reduced.
- the housing intermediate body 31 is formed by deep drawing, but the manufacturing method of the housing intermediate body 31 is not limited to this. Therefore, for example, a housing intermediate body may be obtained by forging a predetermined metal material.
- the housing 2 is configured to have a substantially uniform thickness as a whole, but the thickness of the housing 2 may be locally increased or decreased. Therefore, for example, the holding part 20 may be thicker than the other part of the front end side body part 9, and the heater member 3 may be held by the holding part 20 formed thick.
- the shape of the tool engaging part 6 is not limited to such a shape. Therefore, for example, the tool engaging portion 6 may have a Bi-HEX (deformed 12-angle) shape [ISO22977: 2005 (E)] or the like. *
- the shape of the heater member 3 is not particularly limited, and may be, for example, an elliptical cross section, an elliptical cross section, or a polygonal cross section. Further, as the heater member, a so-called plate heater in which a plurality of insulating bases are formed in a plate shape and a heating element is sandwiched therebetween may be used. *
- the constituent materials of the heating coil 12 and the control coil 13 in the above embodiment are merely examples, and the constituent materials of the heating coil 12 and the like are not particularly limited.
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- Engineering & Computer Science (AREA)
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Resistance Heating (AREA)
Abstract
Description
少なくとも自身の先端部が前記ハウジングの先端から突出した状態で、前記軸孔に挿設されるヒーター部材とを備えるグロープラグであって、
前記ハウジングは、
前記内燃機関の取付孔に前記ねじ部を螺合した際に、前記内燃機関の座面に対して圧接する圧接部と、
前記圧接部及び前記ねじ部間に設けられた筒状の先端側胴部とを有し、
前記先端側胴部の肉厚は、
前記ねじ部のねじ径がM12である場合に1.6mm以下であり、
前記ねじ部のねじ径がM10、M9、又は、M8である場合に0.9mm以下であり、
前記先端側胴部には、前記軸線方向に沿って延びる凸状又は凹状をなす先端側補強部が、前記ハウジングの周方向に沿って間欠的に複数設けられることを特徴とする。
前記ねじ部よりも後端側に設けられ、前記内燃機関への取付時に工具が係合される工具係合部と、
前記工具係合部及び前記ねじ部間に設けられた筒状の後端側胴部とを有し、
前記後端側胴部の肉厚は、
前記ねじ部のねじ径がM12である場合に1.6mm以下であり、
前記ねじ部のねじ径がM10、M9、又は、M8である場合に0.9mm以下であり、
前記後端側胴部には、前記軸線方向に沿って延びる凸状又は凹状をなす後端側補強部が、前記ハウジングの周方向に沿って間欠的に複数設けられることを特徴とする。
前記先端側補強部は、前記保持部よりも後端側に設けられることを特徴とする。
少なくとも自身の先端部が前記ハウジングの先端から突出した状態で、前記軸孔に挿設されるヒーター部材とを備えるグロープラグであって、
前記ハウジングは、
前記ねじ部よりも後端側に設けられ、前記内燃機関への取付時に工具が係合される工具係合部と、
前記工具係合部及び前記ねじ部間に設けられた筒状の後端側胴部とを有し、
前記後端側胴部の肉厚は、
前記ねじ部のねじ径がM12である場合に1.6mm以下であり、
前記ねじ部のねじ径がM10、M9、又は、M8である場合に0.9mm以下であり、 前記後端側胴部には、前記軸線方向に沿って延びる凸状又は凹状をなす後端側補強部が、前記ハウジングの周方向に沿って間欠的に複数設けられることを特徴とする。
前記ハウジングを形成するハウジング形成工程を含み、
前記ハウジング形成工程は、板状の金属材に対して深絞り加工を施すことにより、前記ハウジングとなるべき筒状のハウジング中間体を形成する工程を含むことを特徴とする。
の30%)以上とされている。
るが、ハウジング中間体31の製造手法は、これに限定されるものではない。従って、例えば、所定の金属材料に対して鍛造加工を施すことにより、ハウジング中間体を得ることとしてもよい。
Claims (5)
- 軸線方向に延びる軸孔を有し、外周面に内燃機関の取付孔に螺合するためのねじ部を具備する筒状のハウジングと、
少なくとも自身の先端部が前記ハウジングの先端から突出した状態で、前記軸孔に挿設されるヒーター部材とを備えるグロープラグであって、
前記ハウジングは、
前記内燃機関の取付孔に前記ねじ部を螺合した際に、前記内燃機関の座面に対して圧接する圧接部と、
前記圧接部及び前記ねじ部間に設けられた筒状の先端側胴部とを有し、
前記先端側胴部の肉厚は、
前記ねじ部のねじ径がM12である場合に1.6mm以下であり、
前記ねじ部のねじ径がM10、M9、又は、M8である場合に0.9mm以下であり、
前記先端側胴部には、前記軸線方向に沿って延びる凸状又は凹状をなす先端側補強部が、前記ハウジングの周方向に沿って間欠的に複数設けられることを特徴とするグロープラグ。 - 前記ハウジングは、
前記ねじ部よりも後端側に設けられ、前記内燃機関への取付時に工具が係合される工具係合部と、
前記工具係合部及び前記ねじ部間に設けられた筒状の後端側胴部とを有し、
前記後端側胴部の肉厚は、
前記ねじ部のねじ径がM12である場合に1.6mm以下であり、
前記ねじ部のねじ径がM10、M9、又は、M8である場合に0.9mm以下であり、
前記後端側胴部には、前記軸線方向に沿って延びる凸状又は凹状をなす後端側補強部が、前記ハウジングの周方向に沿って間欠的に複数設けられることを特徴とする請求項1に記載のグロープラグ。 - 前記先端側胴部は、内周において前記ヒーター部材を保持する保持部を具備し、
前記先端側補強部は、前記保持部よりも後端側に設けられることを特徴とする請求項1又は2に記載のグロープラグ。 - 軸線方向に延びる軸孔を有し、外周面に内燃機関の取付孔に螺合するためのねじ部を具備する筒状のハウジングと、
少なくとも自身の先端部が前記ハウジングの先端から突出した状態で、前記軸孔に挿設されるヒーター部材とを備えるグロープラグであって、
前記ハウジングは、
前記ねじ部よりも後端側に設けられ、前記内燃機関への取付時に工具が係合される工具係合部と、
前記工具係合部及び前記ねじ部間に設けられた筒状の後端側胴部とを有し、
前記後端側胴部の肉厚は、
前記ねじ部のねじ径がM12である場合に1.6mm以下であり、
前記ねじ部のねじ径がM10、M9、又は、M8である場合に0.9mm以下であり、
前記後端側胴部には、前記軸線方向に沿って延びる凸状又は凹状をなす後端側補強部が、前記ハウジングの周方向に沿って間欠的に複数設けられることを特徴とするグロープラグ。 - 請求項1乃至4のいずれか1項に記載のグロープラグの製造方法であって、
前記ハウジングを形成するハウジング形成工程を含み、
前記ハウジング形成工程は、板状の金属材に対して深絞り加工を施すことにより、前記ハウジングとなるべき筒状のハウジング中間体を形成する工程を含むことを特徴とするグロープラグの製造方法。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US14/356,722 US9284938B2 (en) | 2012-03-29 | 2013-03-15 | Glow plug and fabrication method for same |
KR1020147025523A KR101603468B1 (ko) | 2012-03-29 | 2013-03-15 | 글로 플러그 및 그 제조방법 |
EP13767933.8A EP2833067A4 (en) | 2012-03-29 | 2013-03-15 | PREHEATING PLUG AND MANUFACTURING METHOD THEREOF |
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JP2012075297A JP5965182B2 (ja) | 2012-03-29 | 2012-03-29 | グロープラグ及びその製造方法 |
JP2012-075297 | 2012-03-29 |
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WO2013145612A1 true WO2013145612A1 (ja) | 2013-10-03 |
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PCT/JP2013/001751 WO2013145612A1 (ja) | 2012-03-29 | 2013-03-15 | グロープラグ及びその製造方法 |
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US (1) | US9284938B2 (ja) |
EP (1) | EP2833067A4 (ja) |
JP (1) | JP5965182B2 (ja) |
KR (1) | KR101603468B1 (ja) |
WO (1) | WO2013145612A1 (ja) |
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JP7076353B2 (ja) * | 2018-10-11 | 2022-05-27 | 日本特殊陶業株式会社 | グロープラグ |
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JP5335489B2 (ja) | 2009-03-06 | 2013-11-06 | 日本特殊陶業株式会社 | グロープラグ用の主体金具の製造方法 |
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2012
- 2012-03-29 JP JP2012075297A patent/JP5965182B2/ja not_active Expired - Fee Related
-
2013
- 2013-03-15 KR KR1020147025523A patent/KR101603468B1/ko not_active IP Right Cessation
- 2013-03-15 EP EP13767933.8A patent/EP2833067A4/en not_active Withdrawn
- 2013-03-15 WO PCT/JP2013/001751 patent/WO2013145612A1/ja active Application Filing
- 2013-03-15 US US14/356,722 patent/US9284938B2/en not_active Expired - Fee Related
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KR20140133576A (ko) | 2014-11-19 |
JP2013204947A (ja) | 2013-10-07 |
US9284938B2 (en) | 2016-03-15 |
KR101603468B1 (ko) | 2016-03-14 |
EP2833067A1 (en) | 2015-02-04 |
JP5965182B2 (ja) | 2016-08-03 |
US20140326207A1 (en) | 2014-11-06 |
EP2833067A4 (en) | 2015-12-23 |
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