WO2013145568A1 - 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
- WO2013145568A1 WO2013145568A1 PCT/JP2013/001380 JP2013001380W WO2013145568A1 WO 2013145568 A1 WO2013145568 A1 WO 2013145568A1 JP 2013001380 W JP2013001380 W JP 2013001380W WO 2013145568 A1 WO2013145568 A1 WO 2013145568A1
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- WIPO (PCT)
- Prior art keywords
- housing
- side body
- heater member
- glow plug
- end side
- 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
- F02P19/021—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
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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
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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
- F23Q2007/004—Manufacturing or assembling methods
-
- 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
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 is in pressure contact with a seat surface provided in the internal combustion engine when the screw portion is screwed into a mounting hole of the internal combustion engine and a mounting hole of the internal combustion engine, and is airtight in the combustion chamber. And a press-contact portion for ensuring the performance.
- the part (front end side body part) located between the screw part and the pressure contact part in the housing has a minimum inner diameter in the front end side body part, and has a holding part that holds the heater member on the inner periphery. Yes.
- the outer diameter of the front end side body portion is configured to be constant along the axial direction of the housing, and the holding portion is configured to have the maximum thickness at the front end side body portion. (For example, refer patent document 1 etc.). *
- the axial force may cause the distal end side body portion to deform so as to swell toward the outer peripheral side. If such deformation occurs, the holding force of the heater member by the holding portion may be reduced. Therefore, in order to ensure sufficient strength in the front end side body portion and to prevent deformation toward the outer peripheral side of the front end side body portion, the thickness of the front end side body portion is generally made relatively large.
- the thickness of the front end side body portion is large as described above, the weight of the housing and thus the glow plug becomes large, coupled with the fact that the holding portion is locally thick. There is a risk of lowering fuel efficiency.
- the amount of material used is increased, which may increase the manufacturing cost.
- the front end side body (holding part) that holds the heater member is thick, the heat of the heater member is drawn more toward the front end side body, so that the rapid temperature rise performance is reduced. There is a risk that the power required for the heater member to reach a predetermined temperature may increase.
- the present invention has been made in view of the above circumstances, and its purpose is to improve fuel efficiency, reduce manufacturing costs, and increase rapidly while preventing the holding force of the heater member from being lowered by the holding portion.
- An object of the present invention is to provide a glow plug capable of improving the temperature and saving power.
- 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;
- the front end side body portion includes a holding portion that directly or indirectly holds the heater member in the inner periphery, The holding portion has a minimum outer diameter in the front end side body portion.
- the thickness is uniform is not only when the thickness of each part of the front end side body portion is exactly the same, but also with a slight difference (for example, 0.1 mm or less) in the thickness of each part. Including some cases.
- the screw diameter of the screw portion is M12, and the thickness of the front end side body portion is 1.6 mm or less.
- the screw diameter of the screw portion is M10, M9, or M8.
- the thickness of the front end side body is 0.9 mm or less.
- the glow plug of this configuration is characterized in that, in any of the above configurations 1 to 3, the heater member is held by the holding portion by being press-fitted into an inner periphery of the holding portion.
- the glow plug manufacturing method of this configuration is the glow plug manufacturing method according to any one of claims 1 to 5, including a housing forming step of forming the housing, wherein the housing forming step includes a plate It includes a step of forming a cylindrical housing intermediate body to be the housing by performing a deep drawing process on the metal material.
- the holding portion is configured to have the smallest outer diameter in the distal end side body portion. Therefore, when an axial force is applied to the front end side body portion, the axial force is decomposed toward the heater member side. Therefore, it can prevent more reliably that the holding force of the heater member by a holding part falls. In addition, the presence of the heater member can prevent deformation of the front end side body portion toward the inner peripheral side.
- the holding portion has the smallest inner diameter at the front end side body portion, the holding portion is naturally thin. Therefore, the weight of the housing can be reduced, and the fuel efficiency can be improved. Furthermore, the material required for manufacturing the housing can be reduced, and the manufacturing cost can be reduced.
- the glow plug of structure 2 it is comprised so that the thickness of the front end side body part may become uniform. That is, the front end side body portion is configured to have the same thickness as the relatively thin holding portion in the entire region. Therefore, the weight of the housing can be further reduced, and the effects such as improvement of fuel consumption performance and reduction of manufacturing cost can be exhibited more effectively.
- the front end side body portion can be made sufficiently thin, and the housing can be further reduced in weight. Accordingly, it is possible to more effectively exhibit the effects such as improvement of fuel consumption performance and reduction of manufacturing cost.
- the diameter between the inner diameter of the holding portion and the outer diameter of the heater member is sufficient to secure the holding force of the heater member.
- the heater member is pressed into the holding portion with a large force. Therefore, the heater member is likely to be damaged or broken during press-fitting.
- the heater member is pressed into the holding portion with a small force with the diameter difference being relatively small, damage to the heater member can be suppressed, but the holding force of the heater member becomes insufficient. There is a risk that.
- the axial force when an axial force is applied to the front end side body portion, the axial force is decomposed toward the inner peripheral side (that is, the heater member side). That is, the axial force is decomposed in the direction in which the holding force of the heater member is further increased. Therefore, as the holding force of the heater member, it is only necessary to ensure a minimum holding force that does not cause the heater member to move relative to the housing when the heater member is not attached to the internal combustion engine. In the case of press-fitting and holding the heater member, it is not necessary to press-fit the heater member with a large force to the holding portion. As a result, damage or breakage of the heater member at the time of press-fitting can be more reliably prevented. *
- the distal end side body portion is configured such that its outer diameter changes gently along the axial direction, and its outer diameter does not change abruptly. Therefore, when an axial force is applied, it can be suppressed that a large force is locally applied to a part of the front end side body portion. As a result, the deformation of the front end side body portion due to the axial force can be more reliably prevented.
- 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.
- (A) is sectional drawing which shows the crack type
- (b) is a top view of a crack type.
- (A) is a sectional view showing a cracked mold in which a housing intermediate is arranged on the inner periphery
- (b) is a sectional view showing pressing of the housing intermediate by a cracked mold
- (c) It is a front view which shows the housing intermediate body in which the holding part was formed. It is a front view which shows the structure of the glow plug in another embodiment. It is sectional drawing 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.
- the pressure contact portion 7 has a tapered shape in which the outer diameter gradually decreases toward the distal end side, and the pressure contact portion 7 is in pressure contact with the seat surface, thereby ensuring airtightness in the combustion chamber.
- the housing 2 includes a rear end side body portion 8 positioned between the screw portion 5 and the tool engagement portion 6, and a front end side body portion 9 positioned between the press contact portion 7 and the screw portion 5.
- the rear end side body portion 8 has a cylindrical shape and is configured to have a constant outer diameter along the direction of the axis CL1. The configuration of the distal end side body portion 9 will be described in detail later. Further, in the present embodiment, the housing 2 is configured to be thin overall and have a substantially uniform thickness. *
- 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 distal end side body portion 9 has the smallest inner diameter of the shaft hole 4 and includes a holding portion 20 that holds the heater member 3 on its inner periphery.
- the heater member 3 is fixed to the housing 2 by being press-fitted into the holding portion 20 in a state where the tip end of the heater member 3 protrudes from the tip of the housing 2.
- the distal end side body portion 9 has an outer diameter that gradually decreases from the distal end of the screw portion 5 toward the holding portion 20 and also from the holding portion 20 toward the rear end of the press contact portion 7. Is configured to gradually increase, and the holding portion 20 is configured to have a minimum outer diameter in the distal end side body portion 9.
- the distal end side body portion 9 has a uniform thickness and is 1.6 mm or less.
- the thickness of the front end side body part 9 is set to 0.9 mm or less.
- the thickness of the distal end side body portion 9 is set to a predetermined value (for example, 0.3 mm) or more.
- 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 to obtain the heater member 3 in which the tube 10 and the central shaft 11 are integrated.
- 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 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
- the holding portion 20 is formed using an annular cracking MA that is divided into a plurality along the circumferential direction and is movable along the radial direction.
- the inner peripheral surface of the cracked mold MA is formed in a curved surface shape that follows the outer peripheral shape of the front end side body portion 9, while the outer peripheral surface of the cracked mold MA has an inclined surface tapered portion TP. Is formed.
- the crack MA is moved radially inward.
- the cracking mold MA is biased toward the outer peripheral side by an elastic member (not shown), and returns to its original position by releasing the pressing of the movable MB against the tapered portion TP. *
- the housing intermediate body 31 is arranged on the inner periphery of the cracked mold MA, and the housing intermediate body 31.
- a cored bar CB2 having a constriction following the inner peripheral shape of the front end side body portion 9 is disposed on the inner periphery of the front end side.
- the formation planned position of the front end side body portion 9 is pressed from the outer peripheral side by the cracking die MA.
- FIG.7 (c) the holding
- the threaded portion 5 is formed at a predetermined portion of the housing intermediate 31 by rolling. Further, the housing 2 can be obtained by bending and deforming the tip of the housing intermediate 31 by press working to form the press contact portion 7. *
- 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 holding portion 20 is configured to have the minimum outer diameter in the distal end side body portion 9. Therefore, when an axial force is applied to the distal end side body portion 9, the axial force is decomposed toward the heater member 3 side. Therefore, it can prevent more reliably that the retention strength of the heater member 3 by the holding
- the holding force of the heater member 3 may be a minimum necessary. Therefore, when the heater member 3 is press-fitted into the holding unit 20, it is not necessary to press-in the heater member 3 into the holding unit 20 with a large force. As a result, damage or breakage of the heater member 3 at the time of press-fitting can be prevented more reliably.
- the thickness of the front end side body portion 9 is 1.6 mm or less. can do. Therefore, the weight of the housing 2 can be sufficiently reduced, and the fuel efficiency can be effectively improved. Furthermore, the material required for manufacturing the housing 2 can be remarkably reduced, and the manufacturing cost can be greatly reduced.
- the heat of the heater member 3 drawn toward the distal end side body portion 9 can be reduced.
- the temperature of the heater member 3 can be increased more rapidly with less supply power.
- the front end side body portion 9 is configured to have a uniform thickness, and the front end side body portion 9 has the same thickness as the relatively thin holding portion 20 in the entire area. It is comprised so that it may have. Therefore, the weight of the housing 2 can be further reduced, and effects such as improvement in fuel efficiency and reduction in manufacturing cost can be exhibited more effectively.
- the distal end side body portion 9 is configured such that its outer diameter gradually changes along the axial direction, and is configured such that its outer diameter does not change abruptly. Therefore, it is possible to prevent a large force from being locally applied to a part of the distal end side body portion 9 with the application of the axial force. As a result, it is possible to more reliably prevent the distal end side body portion 9 from being deformed by the axial force.
- the housing 2 since the housing 2 is reduced in weight, it can prevent more effectively that the heat of the control coil 13 is drawn by the housing 2. Therefore, the temperature of the control coil 13 and thus the resistance value can be quickly increased. As a result, the original function of the control coil 13 that suppresses the power supplied to the heating coil 12 is quickly exhibited, and further power saving can be achieved.
- the housing intermediate body 31 to be the housing 2 is manufactured by performing deep drawing on the plate-like metal material MB. Therefore, the lightweight housing 2 that is thin as a whole can be manufactured more easily, and productivity can be improved.
- the distal end side body portion 9 has an outer diameter that gradually decreases from the distal end of the threaded portion 5 toward the holding portion 20, and is outside from the holding portion 20 toward the rear end of the press contact portion 7.
- the diameter is configured to gradually increase.
- the outer diameter of the portion other than the holding portion 21 in the distal end side body portion 9 is made constant, while the outer diameter of the holding portion 21 is changed to a portion other than the holding portion 21. It may be smaller than the outer diameter. Also in this case, when an axial force is applied to the distal end side body portion 9, the axial force is decomposed toward the heater member 3 side. Therefore, it is possible to more reliably prevent the holding force of the heater member 3 from being lowered and the distal end body portion 9 from being deformed.
- control coil 13 is interposed between the heating coil 12 and the middle shaft 11 in order to prevent overheating 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 is constituted by 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 heater member 3 heat generating coil 12
- the heater member 3 it is possible to further reduce the electric power required to reach the predetermined temperature.
- the heater member 3 is held by the holding portion 20 by being press-fitted into the holding portion 20, but the holding mode of the heater member by the holding portion is limited to this. is not. Therefore, for example, the heater member may be held by joining the heater member to the inner periphery of the holding portion by brazing. Further, for example, the heater member may be held by forming a female screw on the inner periphery of the holding portion, forming a male screw on the outer periphery of the heater member, and screwing the heater member on the inner periphery of the holding portion. *
- the heater member 3 is directly hold
- the housing 2 is generally thin and has a substantially uniform thickness, but the thickness of the housing 2 is not particularly limited, The thickness of the housing 2 may be different in each part. *
- 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 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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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するとともに、
前記先端側胴部は、内周において前記ヒーター部材を直接的又は間接的に保持する保持部を具備し、
前記保持部は、前記先端側胴部における最小の外径を有することを特徴とする。
また、端子ピン17の先端部とハウジング2の後端部との間には、両者間における直接的な通電(短絡)を防止すべく、絶縁性素材からなる絶縁ブッシュ18が設けられている。
加えて、軸孔4内の気密性の向上等を図るべく、ハウジング2及び中軸11の間には、絶縁ブッシュ18の先端部に接触するようにして絶縁性素材からなる環状のシール部材19が設けられている。
また、中軸11によりヒーター部材3(発熱コイル12)から引かれる熱を低減することができるため、ヒーター部材3(発熱コイル12)をより速やかに所定温度に到達させることができるとともに、ヒーター部材3を所定温度に到達させるために必要な電力をさらに少なくすることができる。
さらに、中軸11により制御コイル13の熱が引かれてしまうことを効果的に防止でき、制御コイル13の温度ひいては抵抗値を一層速やかに増大させることができる。その結果、制御コイル13の本来的な機能をより速やかに発揮させることができるとともに、更なる省電力化を図ることができる。
Claims (6)
- 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するとともに、 前記先端側胴部は、内周において前記ヒーター部材を直接的又は間接的に保持する保持部を具備し、
前記保持部は、前記先端側胴部における最小の外径を有することを特徴とするグロープラグ。 - 前記先端側胴部の肉厚が均一とされることを特徴とする請求項1に記載のグロープラグ。
- 次の(a)又は(b)のいずれかを満たす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。
(a)前記ねじ部のねじ径がM12であり、前記先端側胴部の肉厚が1.6mm以下であること
(b)前記ねじ部のねじ径がM10、M9、又は、M8であり、前記先端側胴部の肉厚が0.9mm以下であること - 前記ヒーター部材は、前記保持部の内周に圧入されることで、前記保持部により保持されることを特徴とする請求項1乃至3のいずれか1項に記載のグロープラグ。
- 前記先端側胴部は、前記ねじ部の先端から前記保持部に向けて徐々に外径が減少するとともに、前記保持部から前記圧接部の後端に向けて外径が徐々に増大することを特徴とする請求項1乃至4のいずれか1項に記載のグロープラグ。
- 請求項1乃至5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。
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IN7910DEN2014 IN2014DN07910A (ja) | 2012-03-29 | 2013-03-06 | |
EP13768285.2A EP2833069A4 (en) | 2012-03-29 | 2013-03-06 | GLOW PLUG AND METHOD FOR THE PRODUCTION THEREOF |
KR1020147027315A KR101679945B1 (ko) | 2012-03-29 | 2013-03-06 | 글로 플러그 및 그 제조방법 |
US14/387,640 US20150075473A1 (en) | 2012-03-29 | 2013-03-06 | Glow plug and method for manufacturing same |
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JP2012075292A JP5965179B2 (ja) | 2012-03-29 | 2012-03-29 | グロープラグ及びその製造方法 |
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EP (1) | EP2833069A4 (ja) |
JP (1) | JP5965179B2 (ja) |
KR (1) | KR101679945B1 (ja) |
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EP2840314B1 (en) * | 2012-04-16 | 2020-01-15 | NGK Sparkplug Co., Ltd. | Glow plug |
DE102016114929B4 (de) * | 2016-08-11 | 2018-05-09 | Borgwarner Ludwigsburg Gmbh | Druckmessglühkerze |
KR200490392Y1 (ko) | 2019-02-19 | 2019-11-27 | 정근완 | 이동식 찜질장치 |
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- 2013-03-06 WO PCT/JP2013/001380 patent/WO2013145568A1/ja active Application Filing
- 2013-03-06 KR KR1020147027315A patent/KR101679945B1/ko active IP Right Grant
- 2013-03-06 EP EP13768285.2A patent/EP2833069A4/en not_active Withdrawn
- 2013-03-06 US US14/387,640 patent/US20150075473A1/en not_active Abandoned
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US20150075473A1 (en) | 2015-03-19 |
IN2014DN07910A (ja) | 2015-04-24 |
KR20140129333A (ko) | 2014-11-06 |
EP2833069A4 (en) | 2015-11-18 |
EP2833069A1 (en) | 2015-02-04 |
JP2013204944A (ja) | 2013-10-07 |
KR101679945B1 (ko) | 2016-11-25 |
JP5965179B2 (ja) | 2016-08-03 |
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