WO2012115080A1 - 燃焼圧検知センサ付きグロープラグ - Google Patents
燃焼圧検知センサ付きグロープラグ Download PDFInfo
- Publication number
- WO2012115080A1 WO2012115080A1 PCT/JP2012/054057 JP2012054057W WO2012115080A1 WO 2012115080 A1 WO2012115080 A1 WO 2012115080A1 JP 2012054057 W JP2012054057 W JP 2012054057W WO 2012115080 A1 WO2012115080 A1 WO 2012115080A1
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- WIPO (PCT)
- Prior art keywords
- heater
- housing
- cylindrical
- holding member
- tip
- Prior art date
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/08—Testing internal-combustion engines by monitoring pressure in cylinders
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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
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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
- F23Q2007/005—Manufacturing or assembling methods pressure sensors
Definitions
- the present invention relates to a glow plug with a combustion pressure detection sensor having a function of accelerating ignition in a combustion chamber of an engine and detecting (detecting) a combustion pressure in addition thereto. Specifically, it is attached to the engine head, and in addition to promoting the ignition of fuel by exposing the heater in the combustion chamber, the inside of the housing that holds and holds the combustion pressure (combustion gas pressure) in the combustion chamber with the heater.
- the present invention relates to a glow plug with a combustion pressure detection sensor in which the combustion pressure is detected by a detection sensor such as a piezoelectric element or a strain sensor (gauge) disposed on the surface.
- FIG. 9 is a cutaway longitudinal sectional view showing a simplified cross-sectional structure of a glow plug 901 of the same type.
- a rod-shaped (circular shaft-shaped) heater for example, a metal heater or a ceramic heater
- 10a is provided so as to protrude from the front end 136 of the housing 110.
- the heater 10 receives the combustion pressure and transmits the pressure to the rear end where the detection sensor is arranged, or considers its own thermal expansion and the like in the housing 110. Although it is minute in the direction of the axis G (front-rear direction), it is displaceable. That is, the heater 10 is disposed with a gap (annular gap) between the inner peripheral surface of the housing 110. Further, for example, a piezoelectric element 40 is disposed behind the heater 10 as detection means that can detect the pressure generated when the heater 10 is pushed backward from the tip 10a by the combustion pressure. This is configured to detect the combustion pressure by compressing the piezoelectric element 40 with a force that pushes the heater 10 backward by the combustion pressure, and measuring an electric signal generated in accordance with a change in the compression force. ing.
- a seal member 60 is disposed at K2 to prevent the combustion gas from entering the interior rear.
- the seal member 60 has a metal thin film (for example, a thin film made of SUS630) that itself can be easily deformed, such as a diaphragm or a bellows. ) And the like, and a heat-resistant member having a sufficiently flexible annular film part (membrane) is used.
- the seal member 60 has an enlarged annular space K ⁇ b> 2 between the small diameter cylindrical portion 65 on the front end side and the large diameter cylindrical portion 61 on the rear end side.
- the small-diameter cylindrical portion 65 is joined along the outer peripheral surface of the heater 10 at a predetermined position W1, for example, by welding (laser welding), and the large-diameter cylindrical portion 61 is in the circumferential direction.
- a predetermined position W1 is also referred to as a heater side joint
- the predetermined position W2 is also referred to as a housing side joint.
- the seal member 60 plays a role of blocking the high-temperature and high-pressure combustion gas that enters between the inner peripheral surface of the housing 110 and the outer peripheral surface of the heater 10 (annular space) at the portion near the tip 136 of the housing 110. On the other hand, it also plays a role of allowing the heater 10 to be displaced in the direction of the axis G.
- a seal member is disposed between the inner peripheral surface of the housing and the outer peripheral surface of the heater 10 at a position deeper than the front end of the housing so as to ensure a seal therebetween.
- Some of them have the same structure.
- the sealing member 60 at the portion near the tip of the housing as described above is not necessary.
- a holding member that holds the heater while allowing displacement in the axial direction of the heater separately from the seal member at the back at the front end or a portion near the front end of the housing. It is usually necessary to provide That is, the structure provided with the same deformation
- the heater is in a gap-fitting state in the housing, and the protruding tip has a free end. Therefore, in order to stably hold such a heater, even at the tip of the housing or a portion near the tip. This is because it is necessary to hold (support) the heater separately from the seal member disposed at the back.
- the seal member 60 also serves as a holding member. Therefore, it can be said that the sealing member 60 is a holding member that holds the heater at the front end of the housing or a portion near the front end.
- the seal member 60 has a high-temperature, high-pressure combustion gas (from the tip 136 side) between the inner peripheral surface of the housing 110 and the outer peripheral surface of the heater 10 in accordance with the combustion cycle of the engine. Arranged in such a way that it is directly hit by a blast and receives a thermal shock.
- the sealing member 60 includes the annular film portion 63 and other constituent members (parts) such as the heater 10 and the tip part of the housing 110 (tip-side housing 131) in order to ensure the deformability.
- the wall thickness is considered to be relatively remarkably thin compared to.
- the thickness of the annular film portion 63 is only about 0.1 to 1.0 mm.
- the seal member 60 when the seal member 60 is directly hit by the high-temperature and high-pressure combustion gas in the combustion cycle, the seal member 60 is significantly faster than the other components such as the heater 10 and the housing 110, that is, Therefore, the temperature is instantaneously increased, and therefore, a relatively large thermal expansion (hereinafter also referred to as instantaneous thermal expansion) occurs instantaneously. This is repeated in the combustion cycle.
- instantaneous thermal expansion a relatively large thermal expansion
- the protruding tip 10a of the heater 10 is a free end, and the sealing member 60 having the above-described configuration is fixed to the outer peripheral surface of the heater 10 by welding with the small-diameter cylindrical portion 65 on the tip side at a predetermined position W1.
- the large-diameter cylindrical portion 61 is similarly fixed to the housing 110 side at the predetermined position W2.
- the seal member 60 is instantaneously moved toward the tip side in the direction of the axis G (the direction of the white arrow in FIG. 10) by the direct hit of the combustion gas. This causes a large instantaneous thermal expansion.
- the heater 10 welded to the small-diameter cylindrical portion 65 receives a stress action that is pushed out toward the distal end side (free end side) in response to the instantaneous thermal expansion of the seal member 60. That is, the heater 10 is subjected to an action of being pulled toward the front end side at the heater-side joint portion W1 with the small-diameter cylindrical portion 65 due to instantaneous thermal expansion of the seal member 60, and the piezoelectric element 40 at the rear end of the heater 10, for example.
- the reference position in contact with the substrate is displaced (moved) by a small amount or the compressive force on the piezoelectric element changes.
- the glow plug 901 configured to compress the piezoelectric element 40 with a force that pushes the heater 10 backward by the combustion pressure, and to measure and detect an electric signal generated according to a change in the compression force
- the pushing action toward the tip of the heater 10 due to instantaneous thermal expansion of the member 60 affects the compression.
- the glow plug 901 having the above-described configuration has a problem in that the drift is generated in the detection of the combustion pressure and the detection accuracy is lowered. Such a problem also exists when the sensor for detecting the combustion pressure is not the piezoelectric element 40 but a strain sensor for detecting a strain to the rear of the heater 10 is used.
- Such problems can be dealt with by minimizing the instantaneous thermal expansion of the seal member 60.
- the front-rear length of the seal member 60 is reduced (shortened) so as to reduce the front-rear dimension L1 between the heater-side joint W1 and the housing-side joint W2 of the seal member 60. It is conceivable to reduce the magnitude (length) of the thermal expansion in the forward and backward direction.
- the glow plug there is a limit in reducing the size of the seal member 60 made of a single cylindrical member from the step of welding the heater member and the housing side.
- the heater 10 is prevented from being displaced in the front and rear direction by the combustion pressure.
- the heater is held at the front end of the housing or near the front end separately from the back seal member.
- a holding member is not required to have a sealing property as described above, but, like the sealing member 60, a sufficiently flexible material such as a metal thin film is used.
- the cylindrical “sealing member” also serves as a holding member for holding the heater. Therefore, hereinafter, this sealing member is also referred to as a holding member.
- the present invention has been made to solve the above problems, and as described above, a cylindrical seal member (holding member), and a heater holding member as described above provided separately from this.
- a cylindrical seal member holding member
- a heater holding member as described above provided separately from this.
- the action of pushing the heater forward generated by instantaneous thermal expansion in a different cycle is made smaller, thereby improving the detection accuracy of the combustion pressure. It is an object of the present invention to provide a glow plug with a combustion pressure detection sensor that can be increased.
- a rod-shaped heater having a tip protruding from the tip of the cylindrical housing, and a gap between the inner peripheral surface of the housing and the outer peripheral surface of the heater. And a sensor capable of detecting the combustion pressure by detecting the pressure or displacement generated when the heater is pushed backward from the tip by the combustion pressure.
- a glow plug with a combustion pressure detection sensor An annular space between the inner peripheral surface of the front end of the housing or a portion near the front end and the outer peripheral surface of the heater is formed to be deformable to allow the displacement of the heater, and is fitted to the heater.
- a cylindrical holding member formed to hold the heater is disposed so as to block the annular gap at the front and rear, and is joined to both the housing and the heater along the circumferential direction.
- the holding member has an inner and outer double cylindrical structure made of another member, While one cylindrical holding member is joined along the circumferential direction to the housing on the rear end side thereof to form a housing side joint, The other cylindrical holding member is joined along the circumferential direction to the distal end side of the one cylindrical holding member at its distal end side, and has a joint portion between both cylindrical holding members, The other cylindrical holding member is provided on the outer peripheral surface of the heater along the circumferential direction behind the joint between the two cylindrical holding members so as to serve as a heater side joint.
- a rod-shaped heater having a tip thereof protruding from the tip thereof in a cylindrical housing, and a gap between the inner peripheral surface of the housing and the outer peripheral surface of the heater.
- a sensor capable of detecting the combustion pressure by detecting the pressure or displacement generated when the heater is pushed backward from the tip by the combustion pressure.
- a glow plug with a combustion pressure detection sensor The annular gap between the inner peripheral surface of the tip of the housing or a portion close to the tip and the outer peripheral surface of the heater is formed to be deformable to allow the displacement of the heater, and is fitted to the heater.
- a cylindrical holding member formed to hold the heater is disposed so as to block the annular gap at the front and rear, and is joined to both the housing and the heater along the circumferential direction.
- the holding member has an inner and outer double cylindrical structure made of another member, One cylindrical holding member is joined along the circumferential direction to the housing at the tip side thereof to form a housing side joint, The other cylindrical holding member is joined along the circumferential direction on the rear end side of the one cylindrical holding member on the rear end side of the other cylindrical holding member, and has a joint portion between both cylindrical holding members, The other cylindrical holding member is provided to be joined to the outer peripheral surface of the heater along the circumferential direction ahead of the joint portion between the two cylindrical holding members as a heater side joint portion.
- any one of the one cylindrical holding member and the other cylindrical holding member is a cylindrical one having a substantially constant diameter, and the remaining one is the front and rear. 3.
- the one cylindrical holding member and the other cylindrical holding member have different lengths in the axial direction, of which the axial length is the same.
- the holding member disposed in the annular gap between the inner peripheral surface of the housing and the outer peripheral surface of the heater has an inner / outer double cylinder structure as described above. That is, in the present invention, the holding member has a double-cylindrical cylindrical structure, and the housing-side joint portion and the heater-side joint portion are positioned so as to be folded back at the joint portion between both cylindrical holding members.
- the housing-side joint since the front-rear dimension between the housing-side joint and the heater-side joint can be reduced, even if each of the holding members having the inner and outer double cylindrical structures expands greatly in the front-rear direction, the housing-side joint
- the amount of thermal expansion between the front and rear of the heater-side joining portion itself can be made smaller than the amount of thermal expansion in the entire front and rear length of each cylindrical holding member.
- the action of pushing the heater forward by the thermal expansion of the holding member can be reduced as compared with the prior art, and accordingly, the problem of the occurrence of drift as in the prior art can be alleviated in the detection of the combustion pressure.
- the detection accuracy of the combustion pressure can be increased.
- the conventional holding member having a single cylindrical structure is a process in which the housing and the heater are joined to each other by welding or the like at the housing side joint and the heater side joint, or in the front-rear direction of the holding member itself. Since it was necessary to ensure a sufficient dimension (distance) between the two joints in order to ensure the ease of deformation, it was necessary to make the front and rear length of the holding member itself a considerable length.
- a holding member is heated to an instantaneously high temperature and instantaneously expands more quickly than other members such as a housing or a heater, the thermal stress that the holding member tries to push the heater forward will cause this Since it becomes based on the amount of thermal expansion corresponding to the dimension between parts, it necessarily becomes large.
- the front-rear distance L1 between the two joint portions (housing side joint portion and heater side joint portion) joined to the housing and the heater can be reduced. Therefore, even if the entire cylindrical holding member is thermally expanded so as to extend greatly in a moment instantly, the amount of thermal expansion during the distance L1 can be made smaller than the amount of thermal expansion relative to the entire member. It is possible to reduce the thermal stress to be pushed forward. As described above, in the present invention, even if the holding member is relatively faster than the other components such as the housing and instantaneously becomes an abnormally high temperature and instantaneously expands, the heater is pushed out in the axial direction. Can be reduced or prevented.
- the distance (dimension) L1 between the front and rear of the housing side joint and the heater side joint is 0 (the housing side joint and the heater side joint are in the same position in the front and rear direction), and both cylindrical holding If the member is made of the same material, even if the amount of thermal expansion before and after the entire holding member (each cylindrical holding member) is large, theoretically, the action of pushing the heater forward does not occur. The detection accuracy can be further increased. As understood from this, it is preferable that the distance L1 is as small as possible.
- the cylindrical holding members are joined to the outer peripheral surface of the housing or the heater as described above, and the both cylindrical holding members are joined along the circumferential direction as described above.
- welding such as laser welding.
- this joining means may be brazing, caulking, press-fitting, or a combination thereof other than welding.
- the term “joined along the circumferential direction” means that, besides being joined continuously along the circumferential direction, it is joined discontinuously along the circumferential direction, and Although it is joined continuously along the direction, it is not joined over the entire circumference.
- each joint portion is joined continuously along the entire circumferential direction. Is done.
- being joined discontinuously along the circumferential direction means that, for example, it is usually joined at a plurality of locations at intervals such as 3 or 4 locations along the circumferential direction. It is applied to a holding member that does not require sealing performance.
- the holding member when the holding member is a holding member provided separately from the seal member, the holding member itself does not need to block the annular gap while holding the seal. For this reason, in such a case, it is assumed that the holding member is disposed so as to block the annular gap at the front and rear, and is joined to both the housing and the heater along the circumferential direction. However, it is not necessary to continuously join the entire circumference along the circumferential direction.
- a typical example of the joining means is welding such as laser welding.
- FIG. 1 is a partially broken sectional view of a glow plug with a combustion pressure detection sensor embodying the present invention (first embodiment), and an enlarged view of an essential part thereof.
- FIG. 2 is an exploded view for explaining an assembly process example of the glow plug of FIG. 1, and is an exploded view before a sheath heater or the like is assembled to a housing.
- FIG. 2 is an explanatory diagram of an example of an assembly process of the glow plug of FIG. 1 and an enlarged view of a portion to which a seal member (holding member) is fixed.
- rupture longitudinal cross-sectional view which shows an example of the conventional glow plug with a combustion pressure detection sensor, and the enlarged view of the part containing the sealing member.
- the glow plug 101 of this example includes a substantially cylindrical housing 110, a sheath heater 10 having a tip (lower end in the figure) 10a projecting from the tip 136 of the housing 110, and a sheath heater 10 of the sheath heater 10.
- the piezoelectric element 40 or the like as a sensor disposed on the rear end side is mainly configured.
- the overall configuration of the glow plug 101 will be described in detail with reference to the drawings for explaining the assembly process examples shown in FIGS.
- the housing 110 is inserted and disposed in the housing main body 111 so as to be inserted into the substantially cylindrical housing main body 111 and the piezoelectric element 40 at the rear end of the sheath heater 10.
- the sensor supporting inner housing 121 and the distal end side housing 131 located at the distal end portion of the housing main body 111 are composed of three parts.
- the housing main body 111 includes a screw-in polygonal portion 113 on the outer peripheral surface near the rear end, and a screw 115 for screwing into the cylinder head on the outer peripheral surface on the front end side.
- the distal end side of the screw 115 includes a cylindrical tube portion 117 having a diameter slightly smaller than the diameter of the valley of the screw 115.
- a sensor supporting inner housing 121 is inserted and disposed on the inner peripheral surface of the cylindrical tube portion 117 near the tip.
- the sensor supporting inner housing 121 has a cylindrical tube whose outer diameter is slightly smaller than the inner diameter of the housing main body 111 (see FIGS. 4 and 5), and a flange projectingly formed on the outer peripheral surface on the distal end side. 123.
- the outer diameter of the flange 123 is the same as the outer diameter of the cylindrical tube portion 117 of the housing body 111.
- welding specifically, laser welding
- a cylindrical cap 127 having an annular bottom plate 126 having an opening at the center is provided at the rear end 125 of the sensor supporting inner housing 121. It is welded through.
- the piezoelectric element 40 is arranged in contact with the annular bottom plate 126 so as to form an annular shape and the insulating plates 47 are arranged on both end faces via the electrode plates 43 and 44. Has been placed. Although not shown, signal extraction wirings are led out from the electrode plates 43 and 44 to the rear.
- the sheath heater 10 has a hemispherical shape having a convex tip 10a, a sheath pipe 11 made of a circular tube extending backward, and a heating coil 21 connected to the tip of the tube and extending rearward. And a current-carrying shaft member (circular shaft member) 25 connected to the rear end of the heating coil 21 in the sheath pipe 11 and extending rearward.
- the energizing shaft member 25 is projected from the rear end of the sheath pipe 11.
- occlusion form is externally fitted by the site
- the sheath heater 10 has a rod shape as a whole, and is set so that about half of the sheath pipe 11 is projected from the tip 136 of the housing 110.
- the rear end of the sheath pipe outer tube 31 has a circular rear end bottom 33 reduced in diameter so as to project the energizing shaft member 25.
- a cylindrical portion 35 is formed in a protruding shape on the rear end facing surface of the rear end bottom portion 33.
- the sheath pipe outer tube 31 has a thin-walled portion having a distal end that is substantially the same as the distal end of the inner housing 121 for supporting the sensor and is positioned slightly closer to the distal end and having a small outer diameter. 37.
- the sheath pipe outer tube 31 is in a gap fitting state in which a gap is provided with respect to the inner peripheral surface of the sensor supporting inner housing 121.
- the current-carrying shaft member 25 is provided inside the cylindrical portion 35 at the rear end of the sheath pipe outer tube 31 and inside the pressing body 50 described below, and further, the piezoelectric element 40 and the cylinder described above.
- the cap 110 extends rearward along the axis G in the housing 110 so as to penetrate each inner side (through hole) of the annular bottom plate 126 of the cap 127.
- the rear end of the current-carrying shaft member 25 is fixed at the rear end of the housing main body 111 while being insulated by an insulating material (not shown), and protrudes to the outside.
- the sheath pipe 11 is filled with insulating powder (not shown).
- the insulating plate 47 has substantially the same diameter.
- a pressing body 50 having an annular plate portion 51 and a small annular portion 53 extending concentrically from the circular plate portion 51 is disposed.
- the small annular portion 53 of the pressing body 50 is coaxially fixed to the cylindrical portion 35 at the rear end portion of the sheath pipe outer tube 31.
- the sheath heater 10 has its own tip 10a protruding from the tip 136 of the cylindrical housing 110 as described above, and is disposed in a state of being fitted in the sensor supporting inner housing 121.
- the heater 10 is compressed in the direction of the axis G (rear) by the pressure generated by being pushed rearward from the tip 10 a by the combustion pressure, and the piezoelectric element 40 is a cylinder at the rear end of the sheath pipe outer tube 31.
- the annular plate portion 51 of the pressing body 50 fixed to the portion 35 and the annular bottom plate 126 of the cylindrical cap 127 fixed to the rear end of the sensor supporting inner housing 121 are configured to be compressed. ing. And it is set as the structure which can output the voltage signal which generate
- the wires from the electrode plates 43 and 44 are, for example, passed between the inner side of the annular bottom plate 126 of the cylindrical cap 127 and the current-carrying shaft member 25 (gap) while maintaining insulation and drawn out to the outside. It is provided as follows.
- the inner housing 121 for supporting the sensor has a rear end facing surface 124 of the flange 123 formed so as to protrude from the outer peripheral surface of the front end thereof abut against the front end 118 of the housing body 111. As described above, it is fixed by welding.
- a portion of the sensor supporting inner housing 121 ahead of the flange 123 includes a cylindrical portion 129 having a smaller diameter than the outer diameter of the flange 123.
- one cylindrical sealing member of the cylindrical member (cylindrical portion for fixing the holding member (in this example, a sealing member)) 129 of the holding member 60 having an inner and outer double cylindrical structure.
- the outer cylindrical seal member 160a is fitted over the rear end portion, and at a predetermined position W2 as shown by a black triangle in the drawing. Welding from the outside (see FIG. 3).
- the “holding member” used in each of the following embodiments including the present example is a seal member, it is referred to as “seal member” in each of the following examples.
- the front end side housing 131 externally fits the cylindrical portion (housing side cylindrical portion) 133 closer to the rear end, and thereafter The end surface 132 is brought into contact with the front end facing surface (annular surface) 122 of the flange 123 and welded.
- the distal end portion of the housing 131 has a tapered cylindrical portion 135 whose outer peripheral surface is tapered and has a tapered surface.
- the diameter (inner diameter) D1 of the inner peripheral surface of the distal end 136 is as small as that of the outer peripheral surface of the heater 10.
- An annular gap K1 is set so that an annular gap K2 having a larger diameter is provided between the inner peripheral surface of the front end housing 131 and the outer peripheral surface of the heater 10 behind the gap.
- a sealing member 60 is formed with a sealing member (corresponding to the other cylindrical holding member of the present invention.
- the inner cylindrical sealing member) 160b, and the annular gap is closed before and after as described below. Establishment It has been.
- the outer cylindrical seal member 160a and the inner cylindrical seal member 160b are made of the same material and are made of, for example, SUS630 or Inconel 718 (trademark), but are not limited thereto.
- the outer cylindrical seal member 160a has a dimension in which the rear end side is accommodated in the enlarged-diameter annular space K2, has a relatively large diameter large-diameter cylindrical portion 61, and a distal end side has a relatively small diameter and a small diameter.
- a cylindrical portion (annular portion) 65 is formed.
- a space between the cylindrical portions 61 and 65 is formed of a metal thin film that can be easily deformed like a diaphragm in the front-rear direction, and forms an annular film portion 63 having a curved cross section.
- the large-diameter cylindrical portion 61 is externally fitted to the cylindrical portion 129 for fixing the seal member at the tip of the flange 123 of the inner housing 121 for supporting the sensor, and at a predetermined position W2 as shown in the drawing. It welds along the circumferential direction from the outer peripheral surface side, and has comprised the housing side junction part W2.
- the inner cylindrical seal member 160b is connected to the front end side of the inner cylindrical seal member 160b at a predetermined position W3 on the front end side of the outer cylindrical seal member 160a.
- W3 Corresponding to the joint portion between both cylindrical holding members of the invention
- W3 Corresponding to the joint portion between both cylindrical holding members of the invention
- W3 Corresponding to the joint portion between both cylindrical holding members of the invention
- W3 Corresponding to the joint portion between both cylindrical holding members of the invention
- W3 Corresponding to the joint portion between both cylindrical holding members of the invention
- the seal between the two is held.
- this inner side cylindrical sealing member 160b is welded along the circumferential direction to the outer peripheral surface of the heater 10 in the predetermined position W1 in the back of the junction part W3 between both cylindrical seal members, and the heater side junction part W1. It is said that.
- the heater-side joint W1 is positioned ahead of the housing-side joint W2, but due to the above configuration, the distance in the front-rear direction (dimension between joints) L1 is the housing-side joint. It is smaller than the distance in the front-rear direction (dimension between joints) between W2 and the joint part W3 between the cylindrical seal members, which conventionally forms the heater-side joint part W1.
- the inner cylindrical seal member 160b is a straight pipe (cylindrical pipe) that can be fitted on the heater 10, and therefore, the inner circumference of the inner cylindrical seal member 160b on the distal end side from the heater-side joint W1.
- the surface and the outer peripheral surface of the heater 10 are simply in contact with each other or have a gap (a minute gap).
- the small-diameter cylindrical portion (annular portion) 65 on the distal end side of the outer cylindrical seal member 160a has an inner diameter dimension that can be fitted onto the inner cylindrical seal member 160b.
- the combustion gas pushes the heater 10 backward from the tip 10a.
- the pressure due to this is caused by the annular bottom plate 126 of the cylindrical cap 127 fixed to the rear end of the sensor supporting inner housing 121 and the pressing body 50 fixed to the cylindrical portion 35 of the rear end portion of the sheath pipe outer tube 31.
- the piezoelectric element 40 between the annular plate portion 51 is compressed, and is output and detected as a voltage signal generated thereby.
- the heater 10 is slightly displaced rearward, but mainly, the annular film portion 63 in the outer cylindrical seal member 160a is deformed to allow this displacement.
- the annular film portion 63 has a tapered taper-shaped longitudinal section curve.
- the shape structure may be appropriate as long as the displacement can be tolerated.
- the seal member 60 disposed in the annular gap has an inner / outer double cylinder structure, and the housing-side joint portion W2 and the heater-side joint portion W1 are formed in a so-called double cylinder shape. Since it is positioned so as to be folded back at the joint part W3 between the seal members, the dimension L1 between the front and rear of the housing side joint part W2 and the heater side joint part W1 is used only as in the conventional case. It can be smaller than that. Therefore, high-temperature and high-pressure combustion gas directly hits the seal member 60 in the course of the engine combustion cycle, so that each of the inner and outer double-cylindrical seal members 160a and 160b is instantaneously heated to a higher temperature than the other parts.
- the thermal expansion amount (dimension) itself in the front-rear dimension L1 can be made smaller than that in the entire front-rear length of the outer cylindrical seal member 160a.
- the action of pushing the heater 10 forward by the thermal expansion of the seal member 60 can be reduced as compared with the prior art, and accordingly, the problem of the occurrence of drift in the detection of the combustion pressure can be alleviated. Detection accuracy can be increased.
- action which extrudes the heater 10 ahead can be reduced, so that the front-rear dimension L1 is small.
- the assembly of the glow plug 101 in the above example can be performed, for example, as follows (see FIGS. 4 and 5).
- the sheath heater 10 is assembled by inserting the exothermic coil 21 and the distal end side of the energizing shaft member 25 into the sheath pipe 11 and filling insulating powder (not shown). .
- the sheath pipe outer tube 31 is externally fitted and fixed to a portion near the rear end of the sheath pipe 11.
- a cylindrical cap 127 including the piezoelectric element 40 is assembled to the rear end 125 of the sensor supporting inner housing 121. Then, this assembly is externally fitted to the sheath pipe outer tube 31 (see the left diagram in FIG. 5).
- the inner cylindrical seal member 160b is welded to the externally fitted heater 10 at a predetermined position W1 on the rear end side, and the external cylindrical seal member 160a externally fitted thereto is connected to the tip thereof.
- welding is performed to the predetermined position W3 on the front end side of the inner cylindrical seal member 160b, and the rear end side of the outer cylindrical seal member 160a is connected to the flange 123 of the inner housing 121 for sensor support as described above.
- the flange 123 is sandwiched between the end surfaces of the housing main body 111 fitted from the rear end side and the front end housing 131 fitted from the front end side, and the gaps between the sandwiched surfaces from the outer side in the circumferential direction. It is assembled as shown in FIG. 1 through a process such as welding along.
- this example is not substantially different from the glow plug of the first embodiment described above, and is substantially similar to the enlarged view corresponding to the main part of FIG. 2 shown in FIG. Since only the cross-sectional shape of the seal member 60 having the inner / outer double cylindrical structure is changed, only the difference will be described, and the same parts are denoted by the same reference numerals. That is, in this example, unlike the seal member 60 of the first embodiment, the front and rear lengths of both cylindrical seal members 260a and 260b are the same.
- the large-diameter cylindrical portion 61 on the rear end side of the outer cylindrical seal member 260a which has one cylindrical seal member and has a longitudinal cross-sectional shape similar to the above example, is connected to the front end of the flange 123 of the sensor supporting inner housing 121. And is welded at a predetermined position W2.
- the inner cylindrical seal member 260b forming the other cylindrical seal member is a small-diameter cylindrical portion whose rear end side is smaller in diameter than the front end side, and along the outer circumferential surface of the heater 10 in the circumferential direction at a predetermined position W1 on the rear end side. These are welded to form a heater side joint W1.
- W1 and W2 have the same or substantially the same front-rear position
- the inner diameter of the small-diameter cylindrical portion 65 on the distal end side of the outer cylindrical seal member 260a is the larger diameter on the distal end side of the inner cylindrical seal member 260b.
- the outer diameter of the cylindrical portion is substantially the same as the outer diameter of the cylindrical portion.
- the two are welded along the circumferential direction in the small-diameter cylindrical portion 65 on the distal end side of the outer cylindrical seal member 260a at a predetermined position W3 on the distal end side. It is set as the joint part W3 between cylindrical seal members.
- each of the seal members 60 having the inner and outer double cylindrical structures is directed in the front-rear direction. Even if the thermal expansion greatly occurs, the action of pushing the heater 10 forward can be substantially eliminated.
- this example is not substantially different from the glow plug of the first embodiment described above, and is substantially as shown in the enlarged view corresponding to the main part of FIG. 2 shown in FIG. Furthermore, since only the cross-sectional structure of the seal member 60 having an inner / outer double cylinder structure is changed, only the difference will be described, and the same reference numerals will be given to the same portions. That is, in this example, one cylindrical seal member (in this example, the inner cylindrical seal member) 360a constituting the seal member 60 having an inner / outer double cylinder structure has a simple cylindrical shape, and the sensor supporting inner housing 121 is provided.
- the cylindrical member 129 for fixing the seal member at the end of the flange 123 is fitted outside, and the housing (cylindrical portion 129) is formed from the outer peripheral surface side at a predetermined position W2 shown in the figure on the distal end side of the one cylindrical seal member 360a itself. Are welded along the circumferential direction to form a housing-side joint W2.
- the other cylindrical seal member (outer cylindrical seal member in this example) 360b is similar in cross-sectional shape to the outer cylindrical seal member 160a having the one housing-side joint W2 in the first embodiment.
- the two cylindrical seal members are welded along the circumferential direction to the rear end side of the above-described one cylindrical seal member (inner cylindrical seal member in this example) 360a.
- the seal member joint portion W3 is formed, and the heater side joint portion W1 is welded along the circumferential direction to the outer peripheral surface of the heater 10 at a predetermined position W1 ahead of W3.
- the heater side joint W1 has a front-rear dimension L1 ahead of the housing-side joint W2, which is smaller than the front-rear dimension between W1 and W3.
- the housing-side joint portion is compared with the front-rear dimension in the case of welding to the heater side and the housing side at a predetermined position using only one cylindrical seal member as in the prior art.
- the front-rear dimension L1 between W2 and the heater-side joint W1 can be reduced as in the first embodiment. For this reason, even if the sealing member 60 is greatly instantaneously thermally expanded in the front-rear direction, the action of pushing the heater 10 forward can be reduced.
- the inner cylindrical seal member 360a is made of SUS304, and the outer cylindrical seal member 360b is made of SUS630 or Inconel 718 ( The inner cylindrical seal member 360a has a larger coefficient of thermal expansion than the outer cylindrical seal member 360b.
- the joint portion W3 between the cylindrical seal members is the rear end side of each cylindrical seal member, and the housing side is located on the front end side of the inner cylindrical seal member 360a. Since the joint portion W2 is provided, for example, the inner cylindrical seal member 360a is first welded at the predetermined position W2 on the distal end side to form the housing side joint portion W2, and then the outer tubular seal member 360b.
- the rear end side may be welded to the rear end side of the inner cylindrical seal member 360a, and the front end side of the outer cylindrical seal member 360b may be welded to the outer peripheral surface of the heater 10 at the predetermined position W1.
- the front end side of the outer cylindrical seal member 360b may be welded to the outer peripheral surface of the heater 10 at the predetermined position W1.
- FIG. 8 shows a main part of another example (fourth embodiment) of the glow plug of the present invention, which should be said to be a modification of the above-described third embodiment.
- one cylindrical seal member 460a forming the housing side joint portion W2 out of the seal members 60 having an inner and outer double cylinder structure is reverse to the previous example as shown in FIG.
- the outer cylindrical seal member is welded to the inner peripheral surface of the front end side housing 131 at a predetermined position W2 on the front end side to form a housing side joint W2, and the other end of the outer cylindrical seal member 460a is
- the cylindrical seal member (inner cylindrical seal member) 460b is welded at a predetermined position W3 on the rear end side to form a joint portion W3 between the two cylindrical seal members, and at a predetermined position W1 on the front end side of the inner cylindrical seal member 460b.
- Heater 10 It is obtained by welding to the outer peripheral surface. That is, the previous example is different from the previous example only in that the cylindrical seal member having the heater side joint portion and each cylindrical seal member having the housing side joint portion are reversed inside and outside, and thus has the same effect as the previous example. It is clear.
- the holding member (seal member in each of the above examples) has an inner / outer double cylinder structure made of different members.
- one cylindrical sealing member is welded along the circumferential direction to the housing on the rear end side to form a housing side joint
- the other cylindrical seal member is welded along the circumferential direction to the distal end side of the one cylindrical seal member on the distal end side of the other cylindrical seal member, and has a joint portion between both cylindrical seal members.
- a seal member is welded to the outer peripheral surface of the heater along the circumferential direction behind the joint between the two cylindrical seal members and is provided as a heater side joint.
- one cylindrical seal member having the housing side joint is an outer cylindrical seal member
- the other cylindrical seal member having the heater side joint is an inner cylindrical seal member.
- One cylindrical sealing member having the side joint portion can be embodied as an inner cylindrical sealing member as shown in the third embodiment (FIG. 7).
- each cylindrical seal member is embodied as having a housing-side joint and a heater-side joint.
- the present invention can be embodied as one provided on the tip side of each cylindrical seal member.
- the front-rear dimension L1 of the housing side joint and the heater side joint is preferably small as described above in order to reduce the action of pushing the heater forward.
- the heater-side joint is embodied as being ahead of the housing-side joint, but this can be reversed.
- each joint portion joined to the housing or the heater along the circumferential direction is continuously joined over the entire circumference along the circumferential direction.
- each joining portion joined along the circumferential direction is These may be joined continuously along the circumferential direction, but may be joined discontinuously. For example, it may be spot-bonded at, for example, four places at intervals in the circumferential direction.
- it does not need to be continued over the perimeter. It is good also as what has joined continuously in the circumferential direction in the angle range of the 3/4 circumference (270 degree
- the senor is a piezoelectric element, but the sensor is capable of detecting the combustion pressure from the pressure when the combustion gas presses the heater backward or the displacement of the heater in the front-rear direction. Therefore, the present invention can be similarly applied to, for example, a device using a strain sensor.
- the glow plug of the above example is embodied in a configuration in which the heater is configured by a sheath pipe or the like, and the housing is embodied in a configuration in which the housing is configured by a housing main body, a distal end side housing, or the like. It can be embodied as that of the configuration.
- welding is used as a means for “joining” the cylindrical seal member (holding member).
- welding other than laser welding, electron beam welding, resistance welding, etc.
- it is not limited to welding.
- a joining means other than welding an appropriate means may be used such as an interference fit by caulking or press fitting as described above, or a joining by brazing using a brazing material.
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Abstract
Description
前記ハウジングの先端又は先端寄り部位の内周面と前記ヒータの外周面との間の環状空隙に、該ヒータの前記変位を許容するために変形可能に形成され、しかも、該ヒータに外嵌状態とされて該ヒータを保持するよう形成された筒状をなす保持部材が、該環状空隙を先後において遮断するように配置されて、前記ハウジング及び該ヒータの双方に、周方向に沿って接合されて設けられてなる燃焼圧検知センサ付きグロープラグにおいて、
前記保持部材が、別部材からなる内外二重の筒構造のものとされ、
一方の筒状保持部材がその後端側において前記ハウジングに周方向に沿って接合されてハウジング側接合部を形成している一方、
他方の筒状保持部材は自身の先端側において前記一方の筒状保持部材の先端側に周方向に沿って接合されて両筒状保持部材間接合部を有しており、
該他方の筒状保持部材が、前記両筒状保持部材間接合部よりも後方において前記ヒータの外周面に周方向に沿って接合されてヒータ側接合部とされて設けられていることを特徴とする。
前記ハウジングの先端又は先端寄り部位の内周面と前記ヒータの外周面との間の環状空隙に、該ヒータの前記変位を許容するために変形可能に形成され、しかも、該ヒータに外嵌状態とされて該ヒータを保持するよう形成された筒状をなす保持部材が、該環状空隙を先後において遮断するように配置されて、前記ハウジング及び該ヒータの双方に、周方向に沿って接合されて設けられてなる燃焼圧検知センサ付きグロープラグにおいて、
前記保持部材が、別部材からなる内外二重の筒構造のものとされ、
一方の筒状保持部材がその先端側において前記ハウジングに周方向に沿って接合されてハウジング側接合部を形成している一方、
他方の筒状保持部材は自身の後端側において前記一方の筒状保持部材の後端側に周方向に沿って接合されて両筒状保持部材間接合部を有しており、
該他方の筒状保持部材が、前記両筒状保持部材間接合部よりも先方において前記ヒータの外周面に周方向に沿って接合されてヒータ側接合部とされて設けられていることを特徴とする。
10a ヒータの先端
40 圧電素子(センサ)
101 燃焼圧検知センサ付きグロープラグ
110 ハウジング
111 ハウジング本体
121 センサ支持用内部ハウジング
131 先端側ハウジング
136 ハウジングの先端
160、260、360,460 シール部材(保持部材)
160a、260a 一方の筒状シール部材(筒状保持部材)
160b、260b 他方の筒状シール部材(筒状保持部材)
G ヒータの軸
K1 ハウジングの先端の内周面とヒータの外周面との間の環状空隙
K2 拡径環状空間
W1 ヒータ側接合部
W2 ハウジング側接合部
W3 両筒状シール部材間接合部(両筒状保持部材間接合部)
Claims (4)
- 筒状をなすハウジング内に、その先端から自身の先端を突出させた棒状をなすヒータが、前記ハウジングの内周面と該ヒータの外周面との間に隙間を保持して軸方向に変位可能に配置されており、該ヒータが燃焼圧によって先端から後方に押されることによって発生する圧力又は変位を検出することで燃焼圧を検知可能のセンサを備えてなる燃焼圧検知センサ付きグロープラグであって、
前記ハウジングの先端又は先端寄り部位の内周面と前記ヒータの外周面との間の環状空隙に、該ヒータの前記変位を許容するために変形可能に形成され、しかも、該ヒータに外嵌状態とされて該ヒータを保持するよう形成された筒状をなす保持部材が、該環状空隙を先後において遮断するように配置されて、前記ハウジング及び該ヒータの双方に、周方向に沿って接合されて設けられてなる燃焼圧検知センサ付きグロープラグにおいて、
前記保持部材が、別部材からなる内外二重の筒構造のものとされ、
一方の筒状保持部材がその後端側において前記ハウジングに周方向に沿って接合されてハウジング側接合部を形成している一方、
他方の筒状保持部材は自身の先端側において前記一方の筒状保持部材の先端側に周方向に沿って接合されて両筒状保持部材間接合部を有しており、
該他方の筒状保持部材が、前記両筒状保持部材間接合部よりも後方において前記ヒータの外周面に周方向に沿って接合されてヒータ側接合部とされて設けられていることを特徴とする燃焼圧検知センサ付きグロープラグ。 - 筒状をなすハウジング内に、その先端から自身の先端を突出させた棒状をなすヒータが、前記ハウジングの内周面と該ヒータの外周面との間に隙間を保持して軸方向に変位可能に配置されており、該ヒータが燃焼圧によって先端から後方に押されることによって発生する圧力又は変位を検出することで燃焼圧を検知可能のセンサを備えてなる燃焼圧検知センサ付きグロープラグであって、
前記ハウジングの先端又は先端寄り部位の内周面と前記ヒータの外周面との間の環状空隙に、該ヒータの前記変位を許容するために変形可能に形成され、しかも、該ヒータに外嵌状態とされて該ヒータを保持するよう形成された筒状をなす保持部材が、該環状空隙を先後において遮断するように配置されて、前記ハウジング及び該ヒータの双方に、周方向に沿って接合されて設けられてなる燃焼圧検知センサ付きグロープラグにおいて、
前記保持部材が、別部材からなる内外二重の筒構造のものとされ、
一方の筒状保持部材がその先端側において前記ハウジングに周方向に沿って接合されてハウジング側接合部を形成している一方、
他方の筒状保持部材は自身の後端側において前記一方の筒状保持部材の後端側に周方向に沿って接合されて両筒状保持部材間接合部を有しており、
該他方の筒状保持部材が、前記両筒状保持部材間接合部よりも先方において前記ヒータの外周面に周方向に沿って接合されてヒータ側接合部とされて設けられていることを特徴とする燃焼圧検知センサ付きグロープラグ。 - 前記一方の筒状保持部材と前記他方の筒状保持部材のうち、いずれか一が先後にわたり略一定の径を有する円筒状のものであり、残る一が先後において径が異なる異径円筒状のものであることを特徴とする請求項1又は2のいずれか1項に記載の燃焼圧検知センサ付きグロープラグ。
- 前記一方の筒状保持部材と前記他方の筒状保持部材とがそれらの軸方向において長さが異なるものとされており、そのうち、軸方向の長さが短いものが長いものより熱膨張係数が大きい素材から形成されていることを特徴とする請求項1~3のいずれか1項に記載の燃焼圧検知センサ付きグロープラグ。
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US13/996,102 US8893545B2 (en) | 2011-02-25 | 2012-02-21 | Glow plug with combustion pressure sensor |
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- 2012-02-21 US US13/996,102 patent/US8893545B2/en not_active Expired - Fee Related
- 2012-02-21 KR KR1020137024474A patent/KR101491945B1/ko active IP Right Grant
- 2012-02-21 EP EP12749015.9A patent/EP2679904B1/en not_active Not-in-force
- 2012-02-21 WO PCT/JP2012/054057 patent/WO2012115080A1/ja active Application Filing
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Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2013250014A (ja) * | 2012-06-01 | 2013-12-12 | Ngk Spark Plug Co Ltd | 圧力センサ付きグロープラグ |
JP2014206353A (ja) * | 2013-04-16 | 2014-10-30 | 日本特殊陶業株式会社 | 燃焼圧センサ付きグロープラグの製造方法 |
JP2014206354A (ja) * | 2013-04-16 | 2014-10-30 | 日本特殊陶業株式会社 | 燃焼圧センサ付きグロープラグの製造方法 |
JP2015004462A (ja) * | 2013-06-19 | 2015-01-08 | 日本特殊陶業株式会社 | 燃焼圧センサ付きグロープラグ |
JP2015036601A (ja) * | 2013-08-13 | 2015-02-23 | 日本特殊陶業株式会社 | グロープラグ |
JP2015036597A (ja) * | 2013-08-13 | 2015-02-23 | 日本特殊陶業株式会社 | 圧力センサ付きグロープラグ |
EP2837886A1 (en) * | 2013-08-13 | 2015-02-18 | NGK Spark Plug Co., Ltd. | Glow plug |
JP2015057578A (ja) * | 2013-08-13 | 2015-03-26 | 日本特殊陶業株式会社 | グロープラグ |
US9739487B2 (en) | 2013-08-13 | 2017-08-22 | Ngk Spark Plug Co. Ltd. | Glow plug |
EP2865883A3 (en) * | 2013-10-22 | 2015-12-16 | NGK Spark Plug Co., Ltd. | Glow plug control apparatus and glow plug control method |
DE102013111922B4 (de) * | 2013-10-29 | 2016-04-14 | Borgwarner Ludwigsburg Gmbh | Glühkerze |
US9625150B2 (en) | 2013-10-29 | 2017-04-18 | Borgwarner Ludwigsburg Gmbh | Glow plug |
JP2019002644A (ja) * | 2017-06-16 | 2019-01-10 | 日本特殊陶業株式会社 | 圧力センサ付きグロープラグ |
Also Published As
Publication number | Publication date |
---|---|
EP2679904A4 (en) | 2017-09-06 |
KR101491945B1 (ko) | 2015-02-10 |
EP2679904A1 (en) | 2014-01-01 |
US8893545B2 (en) | 2014-11-25 |
US20130319094A1 (en) | 2013-12-05 |
JP5411364B2 (ja) | 2014-02-12 |
KR20130124386A (ko) | 2013-11-13 |
EP2679904B1 (en) | 2018-07-25 |
JPWO2012115080A1 (ja) | 2014-07-07 |
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