WO2013147260A1 - Dispositif de détection de la pression, et moteur à combustion interne doté du dispositif de détection de la pression - Google Patents

Dispositif de détection de la pression, et moteur à combustion interne doté du dispositif de détection de la pression Download PDF

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Publication number
WO2013147260A1
WO2013147260A1 PCT/JP2013/059740 JP2013059740W WO2013147260A1 WO 2013147260 A1 WO2013147260 A1 WO 2013147260A1 JP 2013059740 W JP2013059740 W JP 2013059740W WO 2013147260 A1 WO2013147260 A1 WO 2013147260A1
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WIPO (PCT)
Prior art keywords
pressure
diaphragm
piezoelectric element
housing
end side
Prior art date
Application number
PCT/JP2013/059740
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English (en)
Japanese (ja)
Inventor
嘉彦 曽我
和生 高橋
貴之 鉢村
Original Assignee
シチズンファインテックミヨタ株式会社
シチズンホールディングス株式会社
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Publication date
Priority claimed from JP2012076147A external-priority patent/JP5820759B2/ja
Priority claimed from JP2012188420A external-priority patent/JP5975793B2/ja
Priority claimed from JP2012191950A external-priority patent/JP5978073B2/ja
Application filed by シチズンファインテックミヨタ株式会社, シチズンホールディングス株式会社 filed Critical シチズンファインテックミヨタ株式会社
Publication of WO2013147260A1 publication Critical patent/WO2013147260A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
    • G01L23/22—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines
    • G01L23/221—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines
    • G01L23/222—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines using piezoelectric devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
    • G01L19/0681—Protection against excessive heat

Definitions

  • the present invention relates to a pressure detection device and an internal combustion engine with a pressure detection device.
  • the combustion pressure sensor is configured to receive the pressure in the combustion chamber with a diaphragm, transmit the pressure to the piezoelectric element via a pressure transmission member, and detect a charge signal generated in the piezoelectric element by a detector via a lead pin and a receptacle. ing.
  • the combustion pressure sensor described in Patent Document 2 has a metallic diaphragm having spherical protrusions disposed at the front end of a housing, and a ceramic-made stress or the like is interposed between the spherical protrusions of the diaphragm and the pressure detection part.
  • a pressure transmission member that relaxes concentration is inserted to prevent deformation and destruction of the detection unit.
  • the combustion pressure sensor described in Patent Document 3 has a diaphragm fixed to a front end surface of a cylindrical housing, and the diaphragm is provided along a flange portion fixed to the front end surface of the housing and an inner peripheral edge of the flange. It is comprised from the diaphragm part and the pressure transmission part connected with a diaphragm.
  • the pressure transmission part is formed with a diameter on the side connected to the diaphragm smaller than that on the side in contact with the pressure detection part to prevent the piezoelectric element from being damaged and to accurately set the combustion pressure. It is configured to transmit to.
  • JP 2005-227001 A JP 2001-74582 A JP 2009-115674 A
  • the diaphragm has a function of receiving the pressure in the combustion chamber and transmitting the pressure to the piezoelectric element. If this diaphragm is also provided with a preload support function for supporting a preload applied to the piezoelectric element from the rear end when the apparatus is assembled, it is necessary to increase the rigidity of the diaphragm. As a result, the rigidity of the diaphragm becomes higher than the rigidity necessary to satisfy the pressure receiving function of the combustion pressure and the pressure transmission function to the piezoelectric element, and the pressure receiving of the combustion pressure and the pressure transmission to the piezoelectric element are not performed with high accuracy. There is a possibility that accuracy may deteriorate.
  • the diaphragm has a function of receiving the pressure in the combustion chamber and transmitting the pressure to the piezoelectric element.
  • the combustion pressure sensor needs to apply a predetermined load (preload) to the piezoelectric element during assembly.
  • preload a predetermined load
  • the diaphragm has a function of applying a preload.
  • the diaphragm needs to have rigidity higher than that required to receive the combustion pressure, and there is a risk that the accuracy may be reduced in receiving the combustion pressure and transmitting pressure to the piezoelectric element. There was concern that it could not be obtained.
  • the diaphragm is configured such that the diaphragm portion and the pressure transmission portion are integrated, and the pressure transmission portion is in contact with the piezoelectric element over a wide area.
  • the diaphragm has a function of applying a preload. For this reason, there is a concern that the diaphragm requires rigidity higher than that necessary to receive the combustion pressure, and a high-accuracy pressure signal cannot be obtained.
  • the present invention provides a cylindrical housing, a diaphragm provided on the front end side of the housing, an axial direction in the housing and disposed on the rear end side of the diaphragm, and through the diaphragm.
  • a piezoelectric element that detects the pressure acting on the piezoelectric element, and is provided in contact with the piezoelectric element in the axial direction in the housing and between the diaphragm and the piezoelectric element, and acts via the diaphragm.
  • a pressure transmitting portion for transmitting to the piezoelectric element; a support member for supporting a rear end of the piezoelectric element; and the pressure transmitting portion fixed to the housing or the supporting member so as to pressurize the axial direction of the housing.
  • a pressure member that applies a load to the piezoelectric element.
  • the diaphragm has a protruding portion that protrudes toward the rear end side in the central region
  • the pressurizing member includes a cylindrical portion that covers an outer periphery of the pressure transmitting portion and the piezoelectric element, and the cylindrical shape. It is good to have the extension part in which the hole which passes the said protrusion part of the said diaphragm was formed in the center part while extending inward from the edge part of the front end side in a site
  • the piezoelectric element can be pressurized, and the diaphragm can exhibit the function of receiving the combustion pressure and transmitting pressure to the piezoelectric element.
  • the area in the direction intersecting the axial direction of the portion where the pressure transmitting portion abuts on the piezoelectric element is the direction of the direction intersecting the axial direction of the portion where the projecting portion of the diaphragm abuts on the pressure transmitting portion. It may be larger than the area. It is possible to make the piezoelectric element difficult to break without enlarging the piezoelectric element.
  • the pressurizing member has one end fixed to the pressure transmitting portion and the other end fixed to the support member.
  • the space between the two fixing portions is a cylindrical portion, and the cylindrical portion is a load adjusting portion. It is good to have.
  • the preload applied to the piezoelectric element has a function of applying a preload to the pressure member having one end fixed to the pressure transmission member and the other end fixed to the support member. There is no need to have it. For this reason, the diaphragm only needs to have the rigidity necessary for receiving the combustion pressure and transmitting it to the pressure transmission member, thereby improving the pressure receiving sensitivity of the combustion pressure and obtaining a highly accurate pressure signal.
  • the load adjusting portion provided on the pressure member may be a thin spring portion.
  • a highly accurate preload can be applied to the piezoelectric element, and a highly accurate pressure signal can be obtained.
  • the load adjusting portion provided on the pressurizing member may be a bellows-like spring portion.
  • the load adjusting portion provided on the pressure member may be a spring portion including a plurality of notches and a plurality of plate portions positioned between the notches.
  • the load adjustment portion provided on the pressure member is a spring portion including a plurality of notches and a plurality of plate portions positioned between the notches, so that a highly accurate preload can be applied to the piezoelectric element. And a highly accurate pressure signal can be obtained.
  • the load adjusting portion provided on the pressure member may be a coiled spring portion.
  • a highly accurate preload can be applied to the piezoelectric element, and a highly accurate pressure signal can be obtained.
  • the load adjusting portion provided on the pressing member is provided on the support member side from the center of the cylindrical portion.
  • the diaphragm and the pressure transmission unit are integrally formed.
  • integrally configuring the diaphragm and the pressure transmission member it is possible to prevent bounce and wear of the contact portion between the diaphragm and the pressure transmission member, and to obtain a highly accurate and reliable pressure signal.
  • the pressurizing member has one end fixed to the pressure transmitting portion and the other end fixed to the supporting member.
  • the two fixing portions are formed of a cylindrical portion, and the diaphragm and the pressure transmitting portion are integrated. It should be configured. Since the preload applied to the piezoelectric element has a function of applying a preload to the pressure member having one end fixed to the pressure transmission member and the other end fixed to the support member, the preload is applied to the diaphragm. There is no need to let For this reason, the diaphragm only needs to have the rigidity necessary for receiving the combustion pressure and transmitting it to the pressure transmission member, thereby improving the pressure receiving sensitivity of the combustion pressure and obtaining a highly accurate pressure signal. In addition, since the diaphragm and the pressure transmission member are integrated, it is possible to prevent bounce and wear of the contact portion between the diaphragm and the pressure transmission member, and to obtain a highly accurate and highly reliable pressure signal.
  • the cylindrical portion provided on the pressure member is a load adjusting portion.
  • the load adjusting portion provided on the pressure member may be provided on the support member side from the center of the cylindrical portion. Since the spring part provided in the pressurizing member is located away from the pressure receiving part, the temperature of the combustion chamber is hardly transmitted to the spring part. Therefore, the influence of heat on the spring characteristics can be suppressed, and short-term temperature drifts such as inter-cycle temperature drift can be suppressed. Thereby, a highly accurate pressure signal can be obtained.
  • the present invention relates to a cylinder head in which a communication hole that communicates between the combustion chamber and the outside is formed, a cylindrical housing that can be inserted into the communication hole of the cylinder head, and the housing A diaphragm provided on the front end side in the insertion direction, a piezoelectric element that is disposed on the rear end side of the diaphragm in the axial direction of the housing and detects a pressure acting through the diaphragm, and an axial direction in the housing A pressure transmitting portion that is provided in contact with the piezoelectric element between the diaphragm and the piezoelectric element and transmits pressure acting on the diaphragm to the piezoelectric element; and a rear end of the piezoelectric element.
  • the supporting member to be supported and the pressure transmitting portion are fixed to the housing or the supporting member so as to pressurize the housing in the axial direction of the housing.
  • the present invention it is possible to perform combustion pressure reception and pressure transmission to the piezoelectric element with higher accuracy and higher accuracy. Further, according to the present invention, the pressure receiving sensitivity of the diaphragm can be improved. Further, since the cylindrical portion of the pressure member is used as the load adjusting portion, the preload can be set with high accuracy for the piezoelectric element, and the sensitivity and linearity can be enhanced. As a result, a highly accurate pressure signal can be obtained. Moreover, since the diaphragm and the pressure transmission member are integrated, it is possible to prevent bounce and wear at the contact portion between the diaphragm and the pressure transmission member. Thereby, a highly accurate and highly reliable pressure signal can be obtained.
  • FIG. 1 is a schematic configuration diagram of an internal combustion engine according to an embodiment. It is an enlarged view of the A section of FIG. It is a disassembled perspective view of the combustion pressure sensor to which each embodiment of the present invention is applied, and each part is disassembled for every element. It is sectional drawing of the combustion pressure sensor by 1st Embodiment. It is an expanded sectional view of the pressure detection part of the combustion pressure sensor of FIG. It is sectional drawing of the combustion pressure sensor by 2nd Embodiment. It is an expanded sectional view of the pressure detection part of the combustion pressure sensor of FIG. It is sectional drawing which shows the assembly procedure of the pressure detection part of FIG. It is an expanded sectional view of the pressure detection part of the combustion pressure sensor by a 3rd embodiment.
  • FIG. 1 is a schematic configuration diagram of an internal combustion engine 1 according to the present embodiment.
  • FIG. 2 is an enlarged view of a portion A in FIG.
  • reference numeral 1 denotes an internal combustion engine in which the combustion pressure sensor of the present invention is incorporated.
  • the internal combustion engine 1 includes a cylinder block 2 having a cylinder 2a, a piston 3 that reciprocates in the cylinder 2a, and a cylinder head 4 that is fastened to the cylinder block 2 and forms a combustion chamber C together with the cylinder 2a and the piston. .
  • the internal combustion engine 1 is a gasoline engine or the like, usually, an ignition plug (not shown) that is attached to the cylinder head 4 to explode the air-fuel mixture in the combustion chamber C and a combustion chamber that is attached to the cylinder head 4.
  • an injector (not shown) for injecting fuel is provided in C, description thereof is omitted here.
  • the internal combustion engine 1 is equipped with a combustion pressure sensor 5 as an example of a pressure detection device provided for detecting the pressure in the combustion chamber.
  • the cylinder head 4 is provided with a communication hole 4a for connecting the combustion chamber C for mounting the combustion pressure sensor 5 to the outside, and the combustion pressure sensor 5 is attached in a penetrating manner.
  • the combustion pressure sensor 5 is clamped and fixed by a screw formed in a communication hole, which will be described later, together with a seal member 7 interposed between the cylinder head 4 and maintaining airtightness in the combustion chamber C.
  • a transmission cable 8 for transmitting a pressure signal detected by the combustion pressure sensor 5 and a control device 6 for processing the sent pressure signal and instructing the internal combustion engine 1 to perform appropriate control are provided.
  • the cylinder head 4 is formed with a communication hole 4a for communicating the combustion chamber C with the outside. From the combustion chamber C side, the shape of the communication hole 4a is the first hole 4b, the inclined part 4c whose diameter gradually increases from the hole diameter of the first hole 4b, and the first hole 4b. And a second hole portion 4d larger than the hole diameter.
  • a female threaded portion 4e is formed in a peripheral hole wall forming the second hole 4d, and a male thread 332a formed in the second housing 32 of the combustion pressure sensor 5 is screwed into the first threaded portion 4e. It is fastened together with the seal member 71.
  • the combustion pressure sensor 5 has a pressure detecting portion 100 at the tip thereof as a pressure receiving portion, and a position where the diaphragm 40 faces the combustion chamber C in the first hole portion 4b of the communication hole 4a provided in the cylinder head 4 described above. Inserted and fixed. At this time, there is a second gap between the inclined surface 315a of the pressure detection portion of the combustion pressure sensor 5 (the outer peripheral portion of the first housing 31 described later) and the inclined portion 4c of the communication hole 4a formed in the cylinder head 4.
  • the seal member 72 is inserted and fastened and fixed together with the first seal member 71 described above. Thereby, airtightness can be maintained so that air-fuel mixture and combustion gas do not leak from the combustion chamber C side.
  • a hexagonal screw portion (fourth outer peripheral surface 334) is formed on the outer side of the cylinder head 4, a holding member 300 is fixed on the upper portion thereof, and signal processing is further provided on the upper portion thereof.
  • the connector part which is a part of the part 200 is exposed.
  • a transmission cable 8 for transmitting a pressure signal to the control device 6 is connected by a connector 8a.
  • a hook provided on the connector 8a is engaged with and fixed to a hole formed in the connector portion.
  • FIG. 3 is an exploded perspective view of a combustion pressure sensor to which each embodiment of the present invention is applied, and each part is disassembled for each element.
  • the combustion pressure sensor 5 to which each embodiment of the present invention is applied includes a pressure detection unit 100 having a piezoelectric element that changes the combustion pressure generated in the combustion chamber C into an electrical signal, and signal processing for processing a signal from the pressure detection unit 100. Part 200.
  • the detailed configuration of each unit will be described in an embodiment described later. Further, in the following description, the diaphragm 40 side located at the left end in FIG. 3 is called the front end side of the combustion pressure sensor 5, and the signal processing unit 200 side on the right end side is called the rear end side of the combustion pressure sensor 5.
  • the center line direction is simply referred to as the center line direction.
  • the combustion pressure sensor 5 includes a pressure detection unit 100 having a piezoelectric element 10 that converts the pressure in the combustion chamber C into an electrical signal, a signal processing unit 200 that processes an electrical signal from the pressure detection unit 100, and a signal processing unit 200. And a holding member 300 for holding.
  • the diaphragm 40 which will be described later, of the pressure detection unit 100 is inserted into the communication hole 4 a formed in the cylinder head 4 first.
  • the pressure detection unit 100 includes a piezoelectric element 10 that converts received pressure into an electric signal, and a housing 30 that is cylindrical and in which a cylindrical hole that accommodates the piezoelectric element 10 and the like is formed. Yes.
  • the center line direction of the cylindrical hole formed in the housing 30 is simply referred to as a center line direction.
  • the pressure detector 100 is provided so as to close the opening on the front end side of the housing 30, and is provided between the diaphragm 40 on which the pressure in the combustion chamber C acts, and between the diaphragm 40 and the piezoelectric element 10.
  • a first electrode unit 50 and a second electrode unit 55 disposed on the opposite side of the piezoelectric element 10 from the first electrode unit 50 are provided.
  • the pressure detection unit 100 is provided with an insulating ring 60 made of alumina ceramic that electrically insulates the second electrode unit 55, and a rear end side of the insulating ring 60.
  • a support member 65 that supports the end of the member 23, and a coil spring 70 that is interposed between the second electrode portion 55 and a conductive member 22 described later are provided.
  • the pressure detection unit 100 covers the outer periphery of the first electrode unit 50, the piezoelectric element 10, the second electrode unit 55, the insulating ring 60, the support member 65, and the like, and on the tip side of the first electrode unit 50.
  • a pressing member 80 that pressurizes the first electrode unit 50 in contact with the surface is provided.
  • the piezoelectric element 10 has a piezoelectric body that exhibits the piezoelectric action of the piezoelectric longitudinal effect.
  • the piezoelectric longitudinal effect refers to the action of generating charges on the surface of the piezoelectric body in the direction of the charge generation axis when an external force is applied to the stress application axis in the same direction as the charge generation axis of the piezoelectric body.
  • the piezoelectric element 10 according to the present embodiment is housed in the housing 30 so that the center line direction is the direction of the stress application axis.
  • the piezoelectric transverse effect is an action in which charges are generated on the surface of the piezoelectric body in the direction of the charge generation axis when an external force is applied to the stress application axis at a position orthogonal to the charge generation axis of the piezoelectric body.
  • a plurality of thinly formed piezoelectric bodies may be laminated, and by laminating in this way, the charge generated in the piezoelectric bodies can be efficiently collected to increase the sensitivity of the sensor.
  • Examples of the piezoelectric single crystal include the use of a langasite crystal (a langasite, langagate, langanite, LGTA) having a piezoelectric longitudinal effect and a piezoelectric transverse effect, quartz, gallium phosphate, and the like.
  • a langasite single crystal is used as the piezoelectric body.
  • the housing 30 includes a first housing 31 provided on the front end side and a second housing 32 provided on the rear end side.
  • the first housing 31 is basically a cylindrical member, and the outer peripheral surface is provided with a protruding portion 315 protruding from the outer peripheral surface in the central portion in the center line direction over the entire region in the circumferential direction.
  • the protrusion 315 has an inclined surface 315a whose diameter gradually increases from the front end side to the rear end side at the front end portion, and a vertical surface 315b perpendicular to the center line direction at the rear end portion.
  • the inner peripheral surface of the first housing 31 is set so that its inner diameter is equal to or less than the diameter of the outer peripheral surface of the pressure member 80 so that the outer peripheral surface of the pressure member 80 is fitted (press-fitted) with an interference fit. Has been.
  • the second housing 32 is a cylindrical member having a cylindrical hole 320 formed therein so that the diameter gradually changes from the front end side to the rear end side, and from the front end side to the outside.
  • An outer peripheral surface 330 is provided so that the diameters are gradually changed toward the rear end side.
  • the hole 320 includes a first hole 321, a second hole 322 having a smaller diameter than the first hole 321, and a hole diameter of the second hole 322, which are sequentially formed from the front end side to the rear end side.
  • a third hole 323 having a larger hole diameter, a fourth hole 324 having a larger hole diameter than the third hole 323, and a fifth hole 325 having a larger hole diameter than the fourth hole 324.
  • the diameter of the first hole 321 is the outer peripheral surface of the first housing 31 so that the front end of the second housing 32 is fitted (press-fit) to the rear end of the first housing 31 with an interference fit. The diameter is set to be equal to or less than.
  • the outer peripheral surface 330 has a first outer peripheral surface 331, a second outer peripheral surface 332 having an outer diameter larger than the outer diameter of the first outer peripheral surface 331, and a second outer peripheral surface 332 from the front end side to the rear end side.
  • a fifth outer peripheral surface 335 having a small outer diameter.
  • a male screw 332 a that is screwed into the female screw 4 e of the cylinder head 4 is formed at the distal end portion of the second outer peripheral surface 332.
  • a first seal member 71 which will be described later, is fitted into the third outer peripheral surface 333 with a clearance fit, and the dimensional tolerance between the outer diameter of the third outer peripheral surface 333 and the inner diameter of the first seal member 71 is, for example, zero. To 0.2 mm.
  • the rear end portion of the fourth outer peripheral surface 334 is formed as a regular hexagonal column having six chamfers at equal intervals in the circumferential direction.
  • the portion formed in the regular hexagonal column is a portion into which a tightening tool is fitted and the rotational force applied to the tool is transmitted.
  • a concave portion 335a that is recessed from the outer peripheral surface is formed over the entire circumference in the center portion of the fifth outer peripheral surface 335 in the center line direction.
  • the second housing 32 is a transition portion from the fourth hole 324 to the fifth hole 325, and a substrate of an insulating member 23 (to be described later) of the signal processing unit 200 is provided at the tip of the fifth hole 325.
  • a pin recess 340a into which a connection pin of a printed wiring board of the signal processing unit 200 described later is inserted is formed on the abutting surface 340.
  • first housing 31 and the second housing 32 are located close to the combustion chamber C, it is desirable to manufacture them using a material that can withstand at least a temperature range of ⁇ 40 to 350 [° C.]. Specifically, it is desirable to use a stainless steel material having high heat resistance, for example, JIS standard SUS630, SUS316, SUS430, or the like. Further, after the first housing 31 and the second housing 32 are fitted, they are further firmly fixed by welding.
  • the diaphragm 40 has a cylindrical cylindrical portion 41 and an inner portion 42 formed inside the cylindrical portion 41.
  • the rear end portion of the cylindrical portion 41 is fitted (press-fitted) into the front end portion of the first housing 31 of the housing 30 with an interference fit, and enters the inside of the front end portion. It has the same shape as 31a, and has an abutting surface 41b against which this end surface 31a abuts when fitted.
  • the inner part 42 is a disk-shaped member provided so as to close the opening on the front end side in the cylindrical part 41, and a protruding part that protrudes from this surface to the piezoelectric element 10 side in the central part on the rear end side surface 42a is provided.
  • a concave portion 42b that is recessed from this surface to the piezoelectric element 10 side is provided at the center of the inner portion 42 on the front end side surface.
  • the material of the diaphragm 40 is preferably made of an alloy having high elasticity and excellent durability, heat resistance, touch resistance, and the like because it exists in the combustion chamber C that is high temperature and high pressure. It can be exemplified that it is SUH660.
  • the diaphragm 40 and the first housing 31 are firmly fixed by welding after being fitted.
  • the first electrode portion 50 is basically a columnar member, and the outer periphery on the tip side is chamfered.
  • the end surface on the front end side is arranged so as to contact the protruding portion 42 a of the inner side portion 42 of the diaphragm 40 and the end surface on the rear end side in contact with the front end side surface of the piezoelectric element 10.
  • the distal end portion of the piezoelectric element 10 is electrically connected to the housing 30 when the outer peripheral surface is in contact with the inner peripheral surface of the pressure member 80 and / or the end surface on the distal end side is in contact with the diaphragm 40.
  • the first electrode unit 50 applies the pressure in the combustion chamber C to the piezoelectric element 10, and the end surface on the rear end side which is the end surface on the piezoelectric element 10 side presses the entire end surface of the piezoelectric element 10. It is formed in a possible size. Further, the first electrode portion 50 is formed in a smooth surface with both end surfaces in the center line direction being parallel (perpendicular to the center line direction) so that the pressure received from the diaphragm 40 can be applied to the piezoelectric element 10 evenly. Has been.
  • An example of the material of the first electrode unit 50 is stainless steel.
  • the second electrode portion 55 is a cylindrical member, and is arranged so that the end surface on the front end side contacts the end surface on the rear end side of the piezoelectric element 10 and the end surface on one end side contacts the insulating ring 60. Is done.
  • a columnar projecting portion 55 a that projects from the end surface to the rear end side is provided on the end surface on the rear end side of the second electrode portion 55.
  • the protrusion 55a has a base end portion on the end face side and a tip end portion having an outer diameter smaller than the outer diameter of the base end portion.
  • the outer diameter of the protruding portion 55a is set smaller than the inner diameter of the insulating ring 60, and the length of the protruding portion 55a is set longer than the width of the insulating ring 60 (the length in the center line direction).
  • the tip is exposed from the insulating ring 60.
  • the second electrode portion 55 is a member that acts so as to apply a certain load to the piezoelectric element 10 with the first electrode portion 50, and the end face on the piezoelectric element 10 side is the surface of the piezoelectric element 10. It is formed in such a size that the entire end surface can be pushed and formed in a parallel and smooth surface.
  • the outer diameter of the second electrode portion 55 is set to be smaller than the hole diameter of the second hole 312 of the first housing 31, and the outer peripheral surface of the second electrode portion 55 and the first housing 31 There is a gap between the inner peripheral surface.
  • the material of the second electrode portion 55 can be exemplified by stainless steel.
  • the insulating ring 60 is a cylindrical member formed of alumina ceramic or the like, and the inner diameter (hole diameter at the center) is slightly larger than the outer diameter of the base end portion of the protruding portion 55a of the second electrode portion 55, The outer diameter is set to be approximately the same as the hole diameter of the second hole 312 of the first housing 31.
  • the second electrode portion 55 is arranged such that the protruding portion 55 a is inserted into the central hole of the insulating ring 60, so that the center position and the center of the second hole 312 of the first housing 31 are the same. It is arranged to become.
  • the support member 65 is a cylindrical member in which a plurality of cylindrical holes 650 having different diameters are formed inside from the front end side to the rear end side, and the outer peripheral surface is the same.
  • the holes 650 are formed in order from the front end side to the rear end side, based on the first hole 651, the second hole 652 having a larger diameter than the first hole 651, and the hole diameter of the second hole 652.
  • a third hole 653 having a larger hole diameter.
  • the hole diameter of the first hole 651 is larger than the outer diameter of the base end portion of the protruding portion 55 a of the second electrode portion 55, and the protruding portion 55 a is exposed to the inside of the support member 65.
  • the hole diameter of the second hole 652 is larger than the outer diameter of the distal end portion of the conductive member 22 of the signal processing unit 200 described later.
  • the hole diameter of the third hole 653 is smaller than the outer diameter of the end portion of the insulating member 23 of the signal processing unit 200 to be described later, and the insulating member 23 fits into the surrounding wall forming the third hole 653 with an interference fit.
  • the support member 65 functions as a member that supports the end portion of the insulating member 23. Further, on the outer peripheral surface of the support member 65, a male screw 65a to be screwed into a female screw 81a described later formed on the pressure member 80 is formed.
  • the coil spring 70 has an inner diameter that is equal to or larger than the outer diameter of the distal end portion of the protruding portion 55a of the second electrode portion 55 and smaller than the outer diameter of the proximal end portion, and the outer diameter is a diameter of an insertion hole 22a of the conductive member 22 described later. Smaller than.
  • the distal end portion of the protruding portion 55a of the second electrode portion 55 is inserted inside the coil spring 70, and the coil spring 70 is inserted into an insertion hole 22a of the conductive member 22 described later.
  • the length of the coil spring 70 is set to a length that can be interposed in a compressed state between the second electrode portion 55 and the conductive member 22.
  • As a material of the coil spring 70 an alloy having high elasticity and excellent durability, heat resistance, touch resistance and the like may be used. Further, it is preferable to increase electrical conduction by applying gold plating to the surface of the coil spring 70.
  • the pressing member 80 includes a cylindrical portion 81 that is a cylindrical portion that covers the outer periphery of the first electrode portion 50, the piezoelectric element 10, the second electrode portion 55, the insulating ring 60, the support member 65, and the like, and the cylinder. And an extending portion 82 extending inward from the tip portion of the shaped portion 81.
  • a female screw 81 a into which a male screw 65 a formed on the outer peripheral surface of the support member 65 is screwed is formed on the inner peripheral surface on the rear end side of the cylindrical portion 81.
  • a through hole 82 a through which the protruding portion 42 a of the inner side portion 42 of the diaphragm 40 passes is formed in the extending portion 82.
  • the tubular portion 81 may be a cylinder (round tube) or a square tube.
  • the outer peripheral surface thereof is fitted (press-fitted) with the inner peripheral surface of the first housing 31 with an interference fit.
  • the outer diameter is set to be equal to or larger than the diameter of the inner peripheral surface of the first housing 31. Then, after the pressurizing member 80 and the first housing 31 are fitted, they are further firmly fixed by welding.
  • the signal processing unit 200 includes a circuit board unit 21 that at least amplifies an electric signal that is a weak charge obtained from the piezoelectric element 10 of the pressure detection unit 100, and a rod shape that guides the charge generated in the piezoelectric element 10 to the circuit board unit 21.
  • the combustion pressure sensor 5 configured as described above is assembled as shown below.
  • the first housing 31 and the diaphragm 40 are fitted (press-fitted) until the end surface 31a of the first housing 31 and the abutting surface 41b of the diaphragm 40 come into contact with each other.
  • a laser beam is irradiated from a direction intersecting the center line direction (for example, a direction orthogonal to the center line direction) to a portion where the end surface 31a of the first housing 31 and the abutting surface 41b of the diaphragm 40 are in contact with each other.
  • the first housing 31 and the diaphragm 40 are welded.
  • the pressurizing member 80 is connected to the rear end face 42 c which is an end face on the rear end side of the protruding portion 42 a of the inner side portion 42 of the diaphragm 40, and the pressurizing member 80.
  • the extending portion 82 is inserted until the end surface 82b on the rear end side is on the same plane.
  • the first housing 31 and the pressure member 80 are fixed.
  • the fixing method include irradiating a laser beam from the outside of the first housing 31 from a direction intersecting the center line direction (for example, a direction orthogonal to the center line direction).
  • the laser beam may be irradiated to the entire circumference in the circumferential direction, or may be partially irradiated at equal intervals in the circumferential direction.
  • the first electrode unit 50 and the piezoelectric element 10 are inserted from the opening on the rear end side of the pressure member 80.
  • the coil spring 70 is attached to the tip of the protruding portion 55a of the second electrode portion 55, and the insulating ring 60 is inserted into the protruding portion 55a of the second electrode portion 55.
  • 31 is inserted through the opening on the rear end side.
  • the support member 65 is inserted from the opening on the rear end side in the first housing 31.
  • a predetermined load is applied to the piezoelectric element 10 in the first housing 31. That is, the male screw 65a formed on the outer peripheral surface of the support member 65 is screwed into the female screw 81a formed on the pressurizing member 80, and the support member 65 uses the insulating ring 60, the second electrode portion 55, The piezoelectric element 10 and the first electrode unit 50 are pressurized in the center line direction from the rear end side toward the front end side.
  • the support member 65 and the pressure member 80 are fixed when the end face on the front end side of the inner side portion 42 of the diaphragm 40 is displaced by a predetermined length.
  • Examples of the fixing method include irradiating a laser beam from the outside of the first housing 31 in a direction intersecting the center line direction (for example, a direction orthogonal to the center line direction).
  • the laser beam may be applied to the entire circumference in the circumferential direction, or may be irradiated spotwise at equal intervals in the circumferential direction.
  • the first housing 31 and the second housing 32 are fitted (press-fit) until the vertical surface 315b of the protruding portion 315 of the first housing 31 and the end surface on the front end side of the second housing 32 come into contact with each other.
  • the laser beam is irradiated from a direction intersecting the center line direction (for example, a direction orthogonal to the center line direction) to a portion where the vertical surface 315b of the first housing 31 and the end surface of the second housing 32 are in contact with each other.
  • the first housing 31 and the second housing 32 are welded.
  • the diaphragm 40 of the pressure detection unit 100 is inserted into the communication hole 4a formed in the cylinder head 4 first,
  • the male screw 332 a formed in the second housing 32 of the housing 30 is screwed into the female screw 4 e formed in the communication hole 4 a of the cylinder head 4.
  • the housing 30 is electrically connected to the metal cylinder head 4. Since the cylinder head 4 is in a state of being electrically grounded, in the combustion pressure sensor 5, the tip portion of the piezoelectric element 10 is grounded via the housing 30.
  • the side surface of the piezoelectric element 10 and the inner wall surface of the housing 30 are in contact with each other, but the resistance value is extremely large because the piezoelectric element 10 is made of an insulator.
  • the electric charge generated with the pressure change is generated at both ends of the piezoelectric element 10 in the center line direction.
  • combustion pressure is applied to the inner side 42 of the diaphragm 40 of the pressure detection unit 100.
  • combustion pressure applied to the diaphragm 40 acts on the piezoelectric element 10 sandwiched between the first electrode portion 50 and the second electrode portion 55, an electric charge corresponding to the combustion pressure is generated in the piezoelectric element 10.
  • the electric charge generated in the piezoelectric element 10 is applied to the circuit board portion 21 via the second electrode portion 55, the coil spring 70, and the conductive member 22.
  • the charge applied to the circuit board unit 21 is amplified by the circuit board unit 21, and then a voltage corresponding to the charge is controlled via the connection pin connected to the circuit board unit 21 and the transmission cable 8. Supplied to the device 6.
  • the seal member 7 includes end faces in the tightening direction of the pressure detector 100 on the surrounding wall forming the communication hole 4 a in the cylinder head 4, the third outer peripheral surface 333 and the fourth outer peripheral surface 334 of the housing 30 of the combustion pressure sensor 5.
  • the first seal member 71 is disposed between the connection surface and the connection surface.
  • the seal member 7 is a second seal member 72 disposed between the inclined portion 4 c of the communication hole 4 a of the cylinder head 4 and the inclined surface 315 a of the first housing 31 of the housing 30 of the combustion pressure sensor 5. have.
  • the material of the piezoelectric element 10 is a material that generates an electric charge proportional to an external force due to the piezoelectric effect, such as a langasite crystal or crystal, and its allowable surface pressure is smaller than the allowable surface pressure of metal, for example. Therefore, it is important to reduce the surface pressure generated in the piezoelectric element 10.
  • the piezoelectric element 10 In order to reduce the surface pressure generated in the piezoelectric element 10, it is conceivable to increase the piezoelectric element 10 itself. However, if the piezoelectric element 10 is enlarged, the housing 30 that houses the piezoelectric element 10 also increases, and the cylinder head 4. The communication hole 4a formed in the step is also enlarged.
  • the tip side of the piezoelectric element 10 (the first electrode unit 50 side).
  • the first electrode portion side end surface 10a which is the end surface of the first electrode portion 50 is made as large as possible, and the rear end side (piezoelectric element 10 side) end surface of the first electrode portion 50 is made as large as possible. Therefore, the piezoelectric element 10 is formed in a columnar shape, and the outer diameter thereof is substantially the same as the hole diameter of the first hole 311 of the first housing 31.
  • the piezoelectric element 10 is formed in a rectangular parallelepiped shape, and the length of the diagonal line of the first electrode portion side end face 10 a is made substantially the same as the hole diameter of the first housing 31.
  • the shape of the first electrode portion 50 is set such that the area of the end face on the rear end side is equal to or larger than the area of the end face 10 a on the first electrode portion side of the piezoelectric element 10. That is, the piezoelectric element 10 has a cylindrical shape whose outer diameter is substantially the same as the hole diameter of the first housing 31, or the length of the diagonal line of the first electrode portion side end face 10a is substantially the same as the hole diameter of the first housing 31.
  • the shape of the first electrode unit 50 is a columnar shape whose outer diameter is substantially the same as the hole diameter of the first housing 31.
  • the diaphragm 40 and the first electrode unit 50 are laser-welded. If laser welding is not properly performed, the contact surface 41b of the diaphragm 40 and the end surface 31a of the first housing 31 are not affected. Combustion gas may flow into the housing 30 from the gap. Therefore, the diaphragm 40 according to the present embodiment is provided with an entry portion 41a that is press-fitted with the tip portion of the first housing 31, and combustion gas flows into the housing 30 from the gap between the diaphragm 40 and the first housing 31. To suppress.
  • the inner part 42 of the diaphragm 40 is a disk-shaped member provided with a projecting part 42a and a concave part 42b at the center part.
  • the diaphragm 40 and the first electrode unit 50 have the following shapes. That is, the area in the direction intersecting the center line direction (axial direction) of the rear end portion as an example of the piezoelectric element side contact portion where the first electrode portion 50 contacts (contacts) the piezoelectric element 10, for example, the rear
  • the area of the end surface on the end side is the area in the direction intersecting the center line direction of the protruding portion 42a as an example of the recessed portion side contact portion where the diaphragm 40 contacts (contacts) the first electrode portion 50, for example, It is larger than the area of the rear end face 42c.
  • the surface pressure generated in the piezoelectric element 10 can be reduced without increasing the communication hole 4a of the housing 30 and the cylinder head 4, and the piezoelectric element 10 can be hardly damaged. . In other words, even if the communication hole 4a of the housing 30 or the cylinder head 4 is reduced, the surface pressure generated in the piezoelectric element 10 can be prevented from increasing.
  • the area in the direction intersecting the center line direction of the front end portion where the first electrode portion 50 contacts the rear end surface 42c of the diaphragm 40 for example, the area of the end surface on the front end side is the area of the rear end side end surface 42c of the diaphragm 40 That's it.
  • the area of the end face on the rear end side of the first electrode portion 50 is the area in the direction intersecting the center line direction of the portion of the piezoelectric element 10 in contact with the end face on the rear end side, for example, the first end of the piezoelectric element 10. It is more than the area of the end surface on the electrode part side. By adopting such a shape, it is possible to reduce the surface pressure generated in the piezoelectric element 10 without increasing the outer shape of the housing 30. Further, the first electrode unit 50 can apply the force received from the diaphragm 40 to the piezoelectric element 10 evenly.
  • a preload to be applied to the piezoelectric element 10 is given by the pressurizing member 80 and the diaphragm 40 on the tip side. Therefore, the rigidity of the diaphragm 40 can be reduced as compared with the case where the pressure member 80 is not provided and the tip side is configured to apply the preload only by the diaphragm 40. As a result, the diaphragm 40 can receive the combustion pressure and transmit the pressure to the piezoelectric element 10 with higher accuracy and higher accuracy.
  • the pressure member 80 includes the rear end surface 42 c in the protruding portion 42 a of the inner portion 42 of the diaphragm 40 and the end surface 82 b on the rear end side in the extending portion 82 of the pressure member 80. While the first housing 31 and the pressure member 80 are fixed in a state where they are inserted until they are on the same plane, the present invention is not particularly limited thereto.
  • the rear end surface 42c of the projecting portion 42a of the inner portion 42 of the diaphragm 40 is added to the first housing 31 at a position displaced by a predetermined amount from the rear end side end surface 82b of the extending portion 82 of the pressing member 80 to the front end side.
  • the pressure member 80 may be fixed.
  • This predetermined amount is an amount in which the rear end surface 42c of the protruding portion 42a of the inner portion 42 of the diaphragm 40 contacts the piezoelectric element 10 due to thermal strain under an environment where the combustion pressure is received.
  • the preload to be applied to the piezoelectric element 10 is applied only by the pressure member 80 on the tip side.
  • the rigidity of the diaphragm 40 can be reduced as compared with the configuration in which the preload applied to the piezoelectric element 10 is applied by the pressure member 80 and the diaphragm 40.
  • the diaphragm 40 can receive the combustion pressure and transmit the pressure to the piezoelectric element 10 with higher accuracy and higher accuracy.
  • a feature of the second embodiment is that, in a pressure detection part of a combustion pressure sensor used in an internal combustion engine or the like, a cylindrical pressure member having one end fixed to a pressure transmission member and the other end fixed to a support member is preliminarily provided.
  • the combustion pressure sensor is configured to have a function of applying a load and not having a function of applying a preload to the diaphragm.
  • the third embodiment is a combustion pressure sensor in which the diaphragm and the pressure transmission member are integrated to prevent bounce and wear of the contact portion.
  • the fourth to ninth embodiments are combustion pressure sensors in which various spring structures are formed on the pressure member.
  • FIGS. 6, 7, and 8 The configuration and assembly procedure of the combustion pressure sensor 5 s of the second embodiment will be described with reference to FIGS. 6, 7, and 8.
  • 6 is a cross-sectional view of the combustion pressure sensor 5s of the second embodiment
  • FIG. 7 is an enlarged cross-sectional view of the pressure detection unit 100 of FIG. 6
  • FIG. 8 is a cross-sectional view showing an assembly procedure of the pressure detection unit 100. It is.
  • FIGS. 6 and 7 First, the configuration of the pressure detection unit 100 will be described.
  • the pressure detection unit 100 is provided so as to close a first housing 31 (hereinafter simply referred to as “housing 31”) serving as a frame of the pressure detection unit, and an opening on the front end side of the housing 31.
  • the support member 65 fixes the pressure member 80A on the outer periphery on the front end side, and is fitted (press-fit) on the inner periphery on the rear end side of the housing 31 with the outer periphery on the rear end side, which will be described later. It is fixed more firmly by welding. Further, the diaphragm 40 is fitted (press-fitted) with the fitting portion 41a to the inner peripheral portion on the distal end side of the housing 31 with an interference fit, and is fixed more firmly by welding.
  • the piezoelectric element 10 housed in the pressure member has a pressure transmission disposed on the tip side. It fixes in the state which applied the predetermined preload in the state pinched
  • the support member 65 described above is fixed to the inner periphery of the rear end side of the housing 31, the contact surface of the pressure transmission member 50 is set to be predetermined with respect to the rear end surface 42c of the protruding portion 42a formed on the diaphragm 40. After fixing to the position of, fix.
  • the pressure detection unit 100 is unitized.
  • the outer peripheral portion of the unitized pressure detection unit 100 is fitted (press-fitted) into the hole 321 at the tip of the second housing 32 (hereinafter referred to as “housing 32”) with an interference fit. It is fixed more firmly by welding.
  • the vertical surface 315b on the rear end side of the ring-shaped protrusion 315 formed on the outer peripheral portion of the housing 31 constituting the pressure detection unit 100 is abutted against the end surface on the front end side of the housing 32 and positioned.
  • the diaphragm 40 has a cylindrical cylindrical portion 41 and an inner portion 42 formed inside thereof.
  • the rear end portion of the cylindrical portion 41 is fitted (press-fitted) into the hole at the distal end portion of the housing 31 with an interference fit, and the abutting surface that abuts against the end surface 31a of the housing 31 and the entry portion 41a that enters the hole in the distal end portion 41b.
  • the inner portion 42 is a thin disc-shaped member provided so as to close the opening on the front end side of the cylindrical portion 41, and a protruding portion 42a protruding from this surface toward the piezoelectric element 10 is provided at the center of the rear end surface. Is provided.
  • a concave portion 42b is provided at the center of the front end surface of the inner portion 42.
  • the material of the diaphragm 40 is preferably made of an alloy having high elasticity and excellent durability, heat resistance, touch resistance, and the like because it exists in the combustion chamber C that is high temperature and high pressure. It is good to comprise using SUH660. Further, after the diaphragm 40 and the housing 31 are fitted, they are further firmly fixed by welding.
  • the housing 31 is a cylindrical member, and a protruding portion 315 is provided in a ring shape on the outer peripheral surface.
  • the protruding portion 315 has an inclined surface 315a whose diameter gradually increases from the front end side to the rear end side, and has a vertical surface 315b at the rear end portion.
  • the inner peripheral surface on the front end side of the housing 31 accommodates the piezoelectric element portion, the inner peripheral surface on the rear end side is fitted (press-fit) with the outer peripheral surface of the support member 65, and is firmly fixed by welding. Is done. Further, the outer peripheral surface of the central portion of the housing 31 is fitted (press-fitted) into the hole 321 on the front end side of the housing 32 described later with an interference fit, and is firmly fixed by welding.
  • the casing 32 is formed therein with a cylindrical hole 320 formed so that the diameter is gradually changed from the front end side to the rear end side, and the outer diameter is gradually increased from the front end side to the rear end side.
  • An outer peripheral surface 330 formed differently is formed.
  • the hole 321 at the front end of the housing 32 is set to be equal to or smaller than the diameter of the outer peripheral surface of the housing 31 so that the outer peripheral surface of the central portion of the housing 31 can be fitted (press-fitted) with an interference fit.
  • the outer peripheral surface 330 is composed of five outer peripheral surfaces from the front end side to the rear end side.
  • the first outer peripheral surface 331 corresponds to the protruding portion 315 of the housing 31, and a male screw 332 a that is screwed into the female screw 4 e of the cylinder head 4 is formed at the tip of the second outer peripheral surface 332.
  • a first seal member 71 described later is fitted into the third outer peripheral surface 333, and a hexagonal nut portion is formed on the rear end side of the fourth outer peripheral surface 334, and the combustion pressure sensor is connected to the cylinder head 4. Used when tightening.
  • a groove 335a is formed on the fifth outer peripheral surface 335 over the entire circumference.
  • the holes 320 formed in the housing 32 in stages correspond to the outer peripheral surfaces 240 formed so as to have different diameters from the front end side to the rear end side formed in the insulating member 23 described later. It is supposed to be.
  • the hole 325 on the rear end side of the housing 32 is provided with a contact surface 340 with which the end surface on the front end side of the substrate covering portion of the insulating member 23 abuts.
  • a pin hole 340a into which a connection pin of the printed wiring board of the signal processing unit 200 is inserted is formed on the abutting surface 340.
  • the housing 31 and the casing 32 are disposed in the vicinity of the combustion chamber C, it is desirable to manufacture them using a material that can withstand at least a temperature range of ⁇ 40 to 350 [° C.].
  • a stainless steel material having high heat resistance for example, JIS standard SUS630, SUS316, SUS430 or the like may be used.
  • the pressure transmission member 50 is a columnar member, and a chamfered portion is formed on the outer periphery on the distal end side.
  • the end surface 50a on the front end side is in contact with the protruding portion 42a of the diaphragm 40, and the end surface on the rear end side is in contact with the end surface 10a on the pressure transmission member 50 side of the piezoelectric element 10.
  • the outer peripheral surface is in contact with the inner peripheral surface of the pressure member 80 ⁇ / b> A, and the end surface on the front end side comes into contact with the protruding portion 42 a of the diaphragm 40, so that the front end portion of the piezoelectric element 10 is electrically connected to the housing 31.
  • the pressure transmission member 50 also serves as the first electrode portion.
  • the pressure transmission member 50 applies the pressure in the combustion chamber C to the piezoelectric element 10, and is formed in such a size that the end surface on the rear end side of the pressure transmission member 50 can press the entire surface of the piezoelectric element 10. ing. Further, the pressure transmission member 50 is formed so that both end faces are parallel (perpendicular to the center line direction) and smooth so that the pressure transmitted from the diaphragm 40 is applied to the piezoelectric element 10 uniformly.
  • a material of the pressure transmission member 50 it is preferable to use stainless steel.
  • the piezoelectric element 10 has a piezoelectric body that exhibits the piezoelectric action of the piezoelectric longitudinal effect.
  • the piezoelectric longitudinal effect refers to the action of generating charges on the surface of the piezoelectric body in the direction of the charge generation axis when an external force is applied to the stress application axis in the same direction as the charge generation axis of the piezoelectric body.
  • the piezoelectric element 10 according to the present embodiment is housed in the housing 31 so that the center line direction is the direction of the stress application axis.
  • the piezoelectric element 10 may be configured using a piezoelectric lateral effect.
  • the piezoelectric transverse effect is an action in which charges are generated on the surface of the piezoelectric body in the direction of the charge generation axis when an external force is applied to the stress application axis at a position orthogonal to the charge generation axis of the piezoelectric body.
  • a plurality of thinly formed piezoelectric bodies may be laminated, and by laminating in this way, the charge generated in the piezoelectric bodies can be efficiently collected to increase the sensitivity of the sensor.
  • a langasite crystal (a langasite, a langagate, a langanite, LGTA) having a piezoelectric longitudinal effect and a piezoelectric transverse effect, quartz, gallium phosphate, or the like may be used.
  • a langasite single crystal is used as the piezoelectric body.
  • the second electrode portion 55 is a columnar member, and is disposed such that the end surface on the front end side is in contact with the end surface on the rear end side in the piezoelectric element 10 and the end surface on the rear end side is in contact with the insulating ring 60. Yes.
  • a columnar projecting portion 55 a that projects from the end surface to the rear end side is provided on the end surface on the rear end side of the second electrode portion 55.
  • the protrusion 55a has a base end portion on the end face side and a tip end portion having an outer diameter smaller than the outer diameter of the base end portion.
  • the outer diameter of the base end portion of the protruding portion 55a is set smaller than the inner diameter of the insulating ring 60, and the length of the protruding portion 55a is longer than the width of the insulating ring 60 so that the protruding portion 55a is exposed from the insulating ring 60. Yes.
  • the second electrode portion 55 is a member that acts to apply a certain load to the piezoelectric element 10 with the pressure transmission member 50, and the end face on the piezoelectric element 10 side is the end face of the piezoelectric element 10. It is formed in such a size that the entire surface can be pressed, and is formed in a parallel and smooth surface.
  • the outer diameter of the second electrode portion 55 is set to be smaller than the inner peripheral hole diameter of the pressure member 80A, which will be described later, and the outer peripheral surface of the second electrode portion 55 and the inner peripheral surface of the pressure member 80A. There is a gap between them so that they do not come into electrical contact.
  • As a material of the second electrode portion 55 stainless steel may be used.
  • the insulating ring 60 is a cylindrical member formed of alumina ceramic or the like, and the inner diameter (hole diameter at the center) is slightly larger than the outer diameter of the base end portion of the protruding portion 55a of the second electrode portion 55, The outer diameter is set to a diameter slightly smaller than the inner peripheral hole diameter of the pressure member 80A.
  • the second electrode portion 55 is configured to be concentric with the inner periphery of the pressurizing member 80 ⁇ / b> A by the protruding portion 55 a being inserted into the hole in the central portion of the insulating ring 60.
  • the support member 65 is a cylindrical member in which a plurality of holes having different diameters are formed inside from the front end side to the rear end side, and the outer peripheral surface also has a plurality of outer peripheries.
  • the hole includes a first hole formed in order from the front end side to the rear end side, and a second hole having a larger hole diameter than the hole diameter of the first hole.
  • the diameter of the first hole is larger than the outer diameter of the base end portion of the projecting portion 55 a of the second electrode portion 55, and the distal end portion of the projecting portion 55 a is exposed to the second hole of the support member 65.
  • the hole diameter of the second hole is larger than the outer diameter of the distal end portion having the insertion hole 22a of the coil spring 70 in the conductive member 22 of the signal processing unit 200 described later. Moreover, the hole diameter of the second hole is smaller than the outer diameter of the end 23a of the insulating member 23 of the signal processing unit 200, and the end 23a of the insulating member 23 is fitted into the second hole by press fitting (press-fit). ) Thereby, the support member 65 functions as a member that supports the tip portion of the insulating member 23.
  • the outer peripheral surface of the support member 65 has three outer peripheral surfaces with different diameters, and the first outer peripheral surface on the tip side is a relief portion when the pressure member 80A is fixed. Further, the second outer peripheral surface forms a ring-shaped protrusion 65a, and the outer periphery is for fitting the pressurizing member 80A, which is larger than the inner peripheral surface of the pressurizing member 80A, and the pressurizing member 80A is tight. It is fitted (press-fit) with a fit. At this time, the ring-shaped protrusion 80d on the rear end side of the pressure member 80A is hooked and positioned by the ring-shaped protrusion 65a of the support member 65. The third outer peripheral surface is fitted to the inner periphery on the rear end side of the housing 31 and fixed by welding.
  • the support member 65 is preferably made of stainless steel.
  • the pressure member 80A is a cylindrical member that covers the outer periphery of the pressure transmission member 50, the piezoelectric element 10, the second electrode portion 55, the insulating ring 60, the support member 65, and the like. 80d, a cylindrical part 80c, and a ring-shaped protrusion 80d on the rear end side.
  • the cylindrical portion 80a is fitted to the outer peripheral portion of the pressure transmission member 50 and is fixed by welding.
  • the cylindrical portion 80b is a thin spring portion for applying a preload to the piezoelectric element 10.
  • a part of the cylindrical portion 80 c is fitted with a ring-shaped protrusion 65 a formed on the support member 65.
  • the cylindrical portion 80d of the pressure member 80A is hooked and positioned with respect to the ring-shaped protrusion 65a of the support member 65.
  • the material of the pressure member is preferably made of stainless steel.
  • the coil spring 70 has an inner diameter that is slightly smaller than the outer diameter of the tip of the protruding portion 55a of the second electrode portion 55, and the outer diameter is smaller than the diameter of the insertion hole 22a of the conductive member 22 described later.
  • the tip of the protruding portion 55 a of the second electrode portion 55 is inserted into the coil spring 70 by light press-fitting, and the coil spring 70 is inserted into the insertion hole 22 a of the conductive member 22.
  • the length of the coil spring 70 is set so as to be compressed between the second electrode portion 55 and the insertion hole 22 a, and conducts the pressure signal from the piezoelectric element 10 to the conductive member 22.
  • the material of the coil spring 70 is preferably made of an alloy having high elasticity and excellent durability, heat resistance, touch resistance, etc., and having a surface plated with gold to enhance electrical conductivity.
  • FIG. 8A shows an assembly procedure of the piezoelectric element unit inside the pressure detection unit 100
  • FIG. 8B shows an assembly procedure of the pressure detection unit 100
  • FIG. The procedure for assembling the pressure detection unit 100 is shown in FIG.
  • the welded portion is marked with “ ⁇ ” for convenience, but does not indicate the actual shape, but merely indicates the “welded portion”. The same applies to the following description.
  • FIGS. 8A, 8B, and 8C [Description of Assembly Procedure of Pressure Detection Unit 100: FIGS. 8A, 8B, and 8C]
  • the pressure member 80 ⁇ / b> A is attached to the support member 65.
  • the cylindrical portion of the pressure member 80A is passed from the rear end side of the support member 65.
  • the ring-shaped protrusion 65a formed on the outer periphery of the support member 65 is pushed in until the ring-shaped protrusion 80d formed on the inner periphery of the pressure member 80A is hooked.
  • the outer diameter of the ring-shaped protrusion 65a formed on the support member 65 is larger than the inner diameter of the corresponding pressure member 80A and is fitted (press-fit) with an interference fit.
  • the insulating ring 60, the second electrode portion 55, the piezoelectric element 10, and the pressure transmission member 50 are inserted in this order from the distal end side of the pressure member 80A.
  • a preload is applied.
  • an assembly jig (not shown) may be used. Set the aforementioned assembly on the assembly jig.
  • the thin spring portion 80b formed in the central portion of the pressure member 80A (FIG. 7 ( The load is applied in the direction (center line direction) in which the pressure member 80A is extended using the step b).
  • a method of irradiating a laser beam over the entire circumference from the outside of the pressure member 80A toward the center line direction may be adopted.
  • the laser beam may be irradiated on the entire circumference, or spot irradiation may be performed at equal intervals in the circumferential direction.
  • spot irradiation may be performed at equal intervals in the circumferential direction.
  • the step of the thin spring portion 80b formed on the pressing member 80A is used as a method of applying a load in the direction of extending the pressing member 80A (center line direction). You may use it, providing a notch. As a result, a preload acts on the piezoelectric element 10 and is fixed.
  • the above-described piezoelectric element portion is assembled to the housing 31.
  • the piezoelectric element portion is inserted from the front end side of the housing 31 to the innermost end.
  • the diaphragm 40 is fitted (press-fitted) into the end surface 31a of the housing 31 with an interference fit using the entry portion 41a as a guide.
  • the engaging portion is fixed with the end surface 31a of the housing 31 and the abutting surface 41b of the diaphragm in contact with each other (welding 2).
  • the piezoelectric element part temporarily assembled in the housing 31 is pushed from the rear end surface side of the support member 65 toward the front end surface side (D direction).
  • the amount of displacement of the inner portion 42 of the diaphragm 40 is measured, and the housing 31 and the support member 65 are fixed when the projecting portion 42a of the diaphragm 40 and the abutting surface of the pressure transmission member 50 abut (welding 3). Thereby, a pressure detection part is assembled.
  • step (c) of FIG. 8 the pressure detection unit assembled in step (b) is assembled in the housing 32.
  • the coil spring 70 is assembled in advance to the protruding portion 55a formed in the second electrode portion.
  • the second outer peripheral portion of the housing 31 of the pressure detection unit assembled in the step (b) is inserted into the hole portion 321 of the housing 32, and fitted (press-fit) with an interference fit.
  • the assembly of step (b) is fixed in a state where the vertical surface 315b of the protruding portion 315 of the housing 31 is in contact with the front end surface of the housing 32 (welding 4). Thereby, the pressure detection unit 100 is completed.
  • the end surface on the rear end side of the piezoelectric element 10 is soldered to the printed wiring board from the metal second electrode portion 55 and the protruding portion 55a via the coil spring 70 and the metal conductive member 22, and is electrically Connected to.
  • the second electrode portion 55 and the protruding portion 55a are electrically insulated from the surrounding support member 65 by an insulating ring 60 made of an insulator, and are also separated from the inner peripheral surface of the pressure member 80A. And electrically insulated.
  • the side surface of the piezoelectric element 10 and the inner wall surface of the housing 30 are in contact with each other, but the resistance value is extremely large because the piezoelectric element 10 is made of an insulator, The electric charge generated with the pressure change is generated at both ends of the piezoelectric element 10 in the center line direction, so that there is no particular problem.
  • the housing 32 When the combustion pressure sensor 5s configured as described above is attached to the cylinder head 4 (see FIG. 2), the housing 32 has a female screw portion provided in the communication hole 4a of the cylinder head from its male screw portion 332a. It is electrically connected to the cylinder head 4 through 4e and is grounded to the vehicle body.
  • the combustion pressure generated in the combustion chamber C acts on the diaphragm 40 at the tip of the combustion pressure sensor 5s, acts on the piezoelectric element 10 via the pressure transmission member 50, and corresponds to the combustion pressure. Charge is generated.
  • the electric charge generated in the piezoelectric element 10 is supplied to the circuit board unit 21, amplified by the circuit board unit 21, and a voltage corresponding to the electric charge is supplied to the control device 6 through the connection pin and the transmission cable 8. .
  • the preload applied to the piezoelectric element is such that one end is fixed to the pressure transmission member, the other end is fixed to the support member, and the pressure member made of a cylindrical portion has a function of applying a preload between the two fixing portions. Therefore, it is not necessary to give the diaphragm a function of preloading. As a result, the diaphragm only needs to have rigidity necessary for receiving the combustion pressure and transmitting it to the pressure transmission member, thereby improving the pressure receiving sensitivity of the combustion pressure and obtaining a highly accurate pressure signal.
  • the cylindrical part 80b of the pressing member 80A is a thin spring part for applying a preload to the piezoelectric element 10, it is not limited to such a form. Between the fixed portions of the pressure member, the width of the cylindrical portion 80b and the position and thickness of the thin portion in the center line direction can be freely configured.
  • the load is applied in the direction in which the pressure member 80A is extended using the step of the thin spring portion 80b” is not limited to this form.
  • a ring-shaped groove may be provided in the cylindrical portion 80a of the pressure member 80A, and a load may be applied in the extending direction using the groove.
  • a notch may be provided in the cylindrical portion 80a, and a load may be applied in the extending direction using the notch.
  • the combustion pressure sensor 5A of the third embodiment is the same as the combustion pressure sensor 5s of the second embodiment described above, in order to prevent bounce and wear of the contact portion between the diaphragm and the pressure transmission member.
  • the transmission member is integrated, the other basic configuration is the same as that of the second embodiment, so the same elements and the same assembly steps are assigned the same numbers, and duplicate descriptions are partially omitted. To do.
  • FIG. 9A is an enlarged sectional view of the pressure detection unit 100 of the combustion pressure sensor 5A using the diaphragm 45
  • FIG. 9B is an enlarged sectional view of the diaphragm 45
  • the diaphragm 45 of the combustion pressure sensor 5A of the third embodiment is configured by integrating the diaphragm 40 and the pressure transmission member 50 of the second embodiment.
  • a separate configuration is formed with a portion where the projecting portion 42a of the diaphragm 40 is in contact with the pressure transmission member 50 as a boundary.
  • this portion is an integrated configuration.
  • the diaphragm unit (40) that is a pressure receiving unit of the diaphragm 45 has the same configuration as the diaphragm 40 in the second embodiment, and the abutting surface 41 b of the diaphragm 45 is in contact with the end surface 31 a of the housing 31. Until it is fitted (press-fit), and then the abutting surface is welded.
  • the cylindrical outer peripheral surface of the pressure transmitting portion (50) is fixed to the pressure member 80A, and the rear end surface is in contact with the piezoelectric element 10.
  • the pressure transmission member 50 of the second embodiment is changed to a diaphragm 45 (integral configuration) in this embodiment.
  • the assembly procedure here is the same, but since the shape of the diaphragm 45 is large, the pressure member 60A is attached to the support member 65, the insulating ring 60, the second electrode portion 55, the piezoelectric element 10, and the pressure transmission.
  • the aforementioned piezoelectric element portion is inserted from the front end side of the housing 31 to the innermost side.
  • the process is a step of fitting (press-fitting) the diaphragm 40 onto the end surface 31a of the housing 31 with an intrusion portion 41a as a guide.
  • the piezoelectric element portion is automatically positioned at the same time as the diaphragm 45 is fitted (press-fitted) into the end surface 31a of the housing 31 with the entry portion 41a as a guide.
  • the combustion pressure sensor 5A has the diaphragm portion (40) and the pressure transmission portion (50) of the diaphragm 45 that are integrated with each other. A step of positioning while measuring is not required. As a result, there is no variation in the positions of the diaphragm part and the pressure transmission part, and the pressure is transmitted with high accuracy.
  • Effect 2 When knocking or the like occurs in the combustion process of the internal combustion engine, excessive pressure fluctuation occurs along with abnormal combustion.
  • the combustion pressure sensor 5B of the fourth embodiment is a range of the thin spring portion 80b (see FIG. 7B) that is a load adjusting portion of the pressurizing member 80A in the combustion pressure sensor 5A of the third embodiment described above. Is the one that was in the center and spread across the fixed part. Since the other basic configuration is the same as that of the third embodiment, the same elements are denoted by the same reference numerals, and a duplicate description is partially omitted.
  • FIG. 11 (a) is an enlarged cross-sectional view of the pressure detection unit 100 of the combustion pressure sensor 5B using the pressurizing member 80B
  • FIG. 11 (b) is a partial cross-sectional view of the pressurizing member 80B.
  • this embodiment is different from the combustion pressure sensor 5A of the third embodiment in that the structure of the pressurizing member 80B is different, and accordingly, the shape of the thin spring portion 81b.
  • the fixing method of the pressure member 80B and the support member 65 is different.
  • the thin spring portion 80b is in the central portion, but in the present embodiment, the configuration is widened between the fixed portions.
  • the tubular part of the pressure member 80 ⁇ / b> B is passed through the tubular part of the pressure member 80 ⁇ / b> B from the rear end side of the support member 65 and the ring-shaped protrusion 65 a formed on the outer periphery of the support member 65. 80c is fixed (welded).
  • the insulating ring 60, the second electrode portion 55, the piezoelectric element 10, and the diaphragm 45 are inserted in this order from the distal end side of the pressure member 80B.
  • a preload is applied.
  • an assembly jig (not shown) may be used. Set the aforementioned assembly on the assembly jig.
  • the support member 65 and the pressure transmission member 50 apply a predetermined load in a direction in which the support member 65 and the pressure transmission member 50 are pressed against each other in the center line direction, and simultaneously apply a load in a direction in which the pressure member 80B is extended (center line direction).
  • the engagement portion between the cylindrical portion 80a of the pressure member 80B and the pressure transmission portion (50) of the diaphragm 45 is fixed. (welding). As a result, the fixed portions on both the diaphragm 45 side and the support member 65 side are welded.
  • a method of irradiating a laser beam over the entire circumference in the direction of the center line may be adopted as in the second and third embodiments.
  • a method of applying a load in the direction in which the pressurizing member 80B is extended (center line direction)
  • a configuration is used in which a thin spring portion 80b formed on the pressurizing member 80B is provided with a step portion at a position avoiding the welded portion.
  • the cylindrical portion 80a may be provided with a dedicated cutout.
  • a preload is applied to the piezoelectric element 10.
  • the combustion pressure sensor 5B includes a diaphragm in which the pressure receiving portion and the pressure transmission portion are integrated, one end fixed to the pressure transmission member, the other end fixed to the support member, and the fixed portion between the fixed portions from the cylindrical portion.
  • the entire fixed portion can be used as a spring portion.
  • the pressure member has one end fixed to the pressure transmission member, the other end fixed to the support member, and the support member side is made of a cylindrical part. it can. Accordingly, a simple cylindrical shape (pipe) that does not require a latching portion can be adopted as the shape of the pressure member. Thereby, it can be set as the structure which employ
  • the diaphragm is configured such that the pressure receiving portion and the pressure transmitting portion are integrated, but the present invention is not limited to such a configuration.
  • the diaphragm 40 and the pressure transmission member 50 can be configured separately (FIG. 7).
  • a latching step is provided on the outer peripheral portion of the pressure transmission member 50, and a ring-shaped protrusion is provided on the inner periphery of the pressure member 80B on the tip surface side so that they can be latched.
  • welding is employed for fixing on the support member side.
  • the contact portion between the diaphragm 40 and the pressure transmission member 50 can be joined by welding. Thereby, even if it is a diaphragm of integral structure finally, the combination of a latch and welding can be chosen freely, and the effect of the diaphragm of integral structure is acquired.
  • FIG. 12A is an enlarged cross-sectional view of the pressure detection unit 100 of the combustion pressure sensor 5C using the pressure member 80C
  • FIG. 12B is a partial cross-sectional view of the pressure member 80C.
  • the fifth embodiment differs from the combustion pressure sensor 5A according to the third embodiment in that the center spring portion has a bellows-like spring structure in the structure of the pressurizing member 80C, and is fixed.
  • the method is the same as that of the third embodiment, and the support member 65 side is fixed and the diaphragm 45 side is fixed by welding. Since other configurations are the same as those of the third embodiment, the same elements are denoted by the same reference numerals, and redundant description is omitted. Thereby, the combustion pressure sensor 5C according to the fifth embodiment is obtained.
  • FIG. 13A is an enlarged cross-sectional view of the pressure detection unit 100 of the combustion pressure sensor 5D using the pressure member 80D
  • FIG. 13B is a plan view of the pressure member 80D.
  • the sixth embodiment differs from the combustion pressure sensor 5A according to the third embodiment in that, in the structure of the pressurizing member 80D, the spring portion at the center has a spring structure with a plurality of notches and a plurality of plate portions.
  • the fixing method is the same as that of the third embodiment, and the supporting member 65 side is latched and the diaphragm 45 side is fixed by welding. Since other configurations are the same as those of the third embodiment, the same elements are denoted by the same reference numerals, and redundant description is omitted. Thereby, the combustion pressure sensor 5D according to the sixth embodiment is obtained.
  • FIG. 14A is an enlarged cross-sectional view of the pressure detection unit 100 of the combustion pressure sensor 5E using the pressure member 80E
  • FIG. 14B is a partial cross-sectional view of the pressure member 80E.
  • the seventh embodiment differs from the combustion pressure sensor 5A according to the third embodiment in that the center spring portion has a coiled spring structure in the structure of the pressurizing member 80E, and is fixed.
  • the method is the same as that of the third embodiment, and the support member 65 side is fixed and the diaphragm 45 side is fixed by welding. Since other configurations are the same as those of the third embodiment, the same elements are denoted by the same reference numerals, and redundant description is omitted. Thereby, the combustion pressure sensor 5E according to the seventh embodiment is obtained.
  • FIG. 15A is an enlarged cross-sectional view of the pressure detection unit 100 of the combustion pressure sensor 5F using the pressure member 80F
  • FIG. 15B is a partial cross-sectional view of the pressure member 80F.
  • the eighth embodiment is different from the combustion pressure sensor 5A according to the third embodiment in that the spring portion has a thin plate-like spring structure in the structure of the pressure member 80F, and the spring portion is the support member 65.
  • the fixing method is the same as that of the third embodiment, and the supporting member 65 side is latched and the diaphragm 45 side is fixed by welding. Since other configurations are the same as those of the third embodiment, the same elements are denoted by the same reference numerals, and redundant description is omitted. Thereby, the combustion pressure sensor 5F according to the eighth embodiment is obtained.
  • FIG. 16A is an enlarged cross-sectional view of the pressure detecting unit 100 of the combustion pressure sensor 5G using the pressurizing member 80G
  • FIG. 16B is a partial cross-sectional view of the pressurizing member 80G.
  • the ninth embodiment differs from the combustion pressure sensor 5A according to the third embodiment in that, in the structure of the pressure member 80G, the spring portion has a thin plate-like spring structure, and the spring portion is the support member 65.
  • the fixing method is the same as in the fourth embodiment, and both the support member 65 side and the diaphragm 45 side are fixed by welding. Since other configurations are the same as those of the third embodiment, the same elements are denoted by the same reference numerals, and redundant description is omitted. Thereby, the combustion pressure sensor 5G according to the ninth embodiment is obtained.
  • the load adjusting portion of the pressurizing member includes a thin plate-like spring portion, a bellows-like spring portion, a spring portion including a plurality of notches and a plurality of plate portions, and a coil-like spring portion. Therefore, a spring means having a small load change with respect to a change in length can be obtained. For this reason, a spring configuration with less load variation can be obtained with respect to the dimensional variation in the center line direction of each member between the diaphragm 45 and the support member 65. Thereby, a highly accurate preload can be applied to the piezoelectric element, sensitivity and linearity can be improved, and a highly accurate pressure signal can be obtained.
  • the fixing part on the diaphragm side employs a fixing method by welding
  • the fixing part on the support member side uses a fixing method by latching or a fixing method by welding.
  • the position of the spring portion is the center portion or the support member side, but is not limited to such a form.
  • the position of the spring portion may be on the diaphragm side.
  • the thickness of the spring part of the pressurizing member is reduced to provide a step, the present invention is not limited to such a form.
  • the spring part and the fixed part may have the same thickness, or conversely, the spring part may be thick.
  • the fixing part on the diaphragm side adopts a fixing method by welding
  • the fixing part on the support member side uses a fixing method by latching or a fixing method by welding. It is not limited to such a form.
  • the diaphragm side may be fixed by latching.
  • a feature of the tenth embodiment is a basic configuration example of the present invention.
  • a pressure detection unit of a combustion pressure sensor used in an internal combustion engine or the like one end is fixed to a pressure transmission member and the other end is a support member.
  • This is a combustion pressure sensor that has a function to give a preload to the cylindrical pressure member fixed to the cylinder, and the diaphragm is a structure in which the diaphragm part and the pressure transmission part are integrated so as not to have a function to give a preload. is there.
  • a feature of the eleventh embodiment is a combustion pressure sensor having a configuration in which a load adjusting portion provided in the pressurizing member is provided on the support member side, and the influence of heat on the spring characteristics is suppressed.
  • a feature of the twelfth embodiment is that a load adjusting portion provided on the pressure member is a spring portion including a plurality of notches and a plurality of plate portions positioned between the notches, and a highly accurate preload is provided.
  • a combustion pressure sensor configured to be applied to a piezoelectric element.
  • a feature of the thirteenth embodiment is a combustion pressure sensor in which fixing by latching and fixing by welding can be selected in the fixing method of both ends of the pressure member.
  • FIGS. 17 is a cross-sectional view of the combustion pressure sensor 5H of the tenth embodiment
  • FIG. 18 is an enlarged cross-sectional view of the pressure detection unit 100 of FIG. 17
  • FIG. 19 is a cross-sectional view showing the assembly procedure of the pressure detection unit 100. It is.
  • FIGS. 17 and 18 First, the configuration of the pressure detection unit 100 will be described.
  • the pressure detection unit 100 includes a housing 31 that is a frame of the pressure detection unit, a diaphragm 45 that is provided so as to close an opening on the distal end side of the housing 31, and a pressure transmission unit ( 50), the piezoelectric element 10 that generates a charge by receiving pressure from the pressure transmission section (50), the second electrode section 55 that supports the piezoelectric element 10 and receives the generated charge as an electrical signal (first electrode)
  • the insulating ring 60 that supports and insulates the second electrode portion 55, the support member 65 that supports the insulating ring 60, and one end fixed to the pressure transmission portion (50) of the diaphragm 45 and the other end.
  • the diaphragm 45 has an integral structure in which a diaphragm portion (40) on which the pressure of the combustion chamber C acts and a pressure transmission portion (50) are connected by a reduced diameter portion.
  • the support member 65 fixes the pressure member 80A on the outer periphery on the front end side, and is fitted (press-fit) on the inner periphery on the rear end side of the housing 31 with the outer periphery on the rear end side, which will be described later. It is fixed more firmly by welding.
  • the diaphragm 45 is fitted (press-fit) with an interference fit to the inner peripheral portion of the distal end side of the housing 31 and fixed more firmly by welding.
  • the piezoelectric element 10 housed in the pressure member is disposed on the tip side.
  • the diaphragm 45 is fixed in a state where a predetermined preload is applied while being sandwiched between the pressure transmission portion (50) of the diaphragm 45, the second electrode portion 55 and the insulating ring 60 disposed on the rear end side.
  • the pressure detection unit 100 is unitized.
  • the outer peripheral portion of the unitized pressure detection unit 100 is fitted (press-fitted) into the hole 321 at the distal end of the housing 32 with an interference fit, and is further firmly fixed by welding.
  • the vertical surface 315b on the rear end side of the ring-shaped protrusion 315 formed on the outer peripheral portion of the housing 31 constituting the pressure detection unit 100 is abutted against the end surface on the front end side of the housing 32 and positioned.
  • the diaphragm 45 has a cylindrical cylindrical portion 41 and an inner portion 42 formed inside thereof.
  • the rear end portion of the cylindrical portion 41 is fitted (press-fitted) into the hole at the distal end portion of the housing 31 with an interference fit, and the abutting surface that abuts against the end surface 31a of the housing 31 and the entry portion 41a that enters the hole in the distal end portion 41b.
  • the inner portion 42 is a disk-shaped thin member provided so as to close the opening on the front end side of the cylindrical portion 41, and a reduced diameter portion protruding from this surface to the piezoelectric element 10 side at the center portion of the rear end surface.
  • the pressure transmission part (50) is integrally formed.
  • the outer peripheral surface of the pressure transmitting portion (50) of the diaphragm 45 is in contact with the inner peripheral surface of the pressure member 80A, and the end surface on the rear end side is in contact with the piezoelectric element 10. Thereby, the piezoelectric element 10 is electrically connected to the housing 31.
  • a pressure transmission part (50) serves as the 1st electrode part.
  • the pressure transmission part (50) applies the pressure in the combustion chamber C to the piezoelectric element 10, and the end face on the rear end side of the pressure transmission part (50) can press the entire surface of the piezoelectric element 10. It is formed in a large size.
  • the pressure transmitting portion (50) has a rear end surface formed in parallel (perpendicular to the center line direction) and a smooth surface so that the pressure transmitted from the diaphragm 45 is uniformly applied to the piezoelectric element 10.
  • a concave portion 42b is provided at the center of the front end surface of the inner portion 42.
  • the material of the diaphragm 40 is preferably made of an alloy having high elasticity and excellent durability, heat resistance, touch resistance, and the like because it exists in the combustion chamber C that is high temperature and high pressure. It is good to comprise using SUH660. Moreover, after the diaphragm 45 and the housing 31 are fitted, they are further firmly fixed by welding.
  • the housing 31 is a cylindrical member, and a protruding portion 315 is provided in a ring shape on the outer peripheral surface.
  • the protruding portion 315 has an inclined surface 315a whose diameter gradually increases from the front end side to the rear end side, and has a vertical surface 315b at the rear end portion.
  • the inner peripheral surface on the front end side of the housing 31 accommodates the piezoelectric element portion, the inner peripheral surface on the rear end side is fitted (press-fit) with the outer peripheral surface of the support member 65, and is firmly fixed by welding. Is done. Further, the outer peripheral surface of the central portion of the housing 31 is fitted (press-fitted) into the hole 321 on the front end side of the housing 32 described later with an interference fit, and is firmly fixed by welding.
  • the casing 32 is formed therein with a cylindrical hole 320 formed so that the diameter is gradually changed from the front end side to the rear end side, and the outer diameter is gradually increased from the front end side to the rear end side.
  • An outer peripheral surface 330 formed differently is formed.
  • the hole 321 at the front end of the housing 32 is set to be equal to or smaller than the diameter of the outer peripheral surface of the housing 31 so that the outer peripheral surface of the central portion of the housing 31 can be fitted (press-fitted) with an interference fit.
  • the outer peripheral surface 330 is composed of five outer peripheral surfaces from the front end side to the rear end side.
  • the first outer peripheral surface 331 corresponds to the protruding portion 315 of the housing 31, and a male screw 332 a that is screwed into the female screw 4 e of the cylinder head 4 is formed at the tip of the second outer peripheral surface 332.
  • a first seal member 71 described later is fitted into the third outer peripheral surface 333, and a hexagonal nut portion is formed on the rear end side of the fourth outer peripheral surface 334, and the combustion pressure sensor is connected to the cylinder head 4. Used when tightening.
  • a groove 335a is formed on the fifth outer peripheral surface 335 over the entire circumference.
  • the holes 320 formed in the casing 32 in stages correspond to the outer peripheral surfaces 240 formed so as to have different diameters from the front end side to the rear end side formed in the insulating member 23 described later. It is supposed to be.
  • the hole 325 on the rear end side of the housing 32 is provided with a contact surface 340 with which the end surface on the front end side of the substrate covering portion of the insulating member 23 abuts.
  • a pin hole 340a into which a connection pin of the printed wiring board of the signal processing unit 200 is inserted is formed on the abutting surface 340.
  • the housing 31 and the casing 32 are disposed in the vicinity of the combustion chamber C, it is desirable to manufacture them using a material that can withstand at least a temperature range of ⁇ 40 to 350 [° C.].
  • a stainless steel material having high heat resistance for example, JIS standard SUS630, SUS316, SUS430 or the like may be used.
  • the piezoelectric element 10 has a piezoelectric body that exhibits the piezoelectric action of the piezoelectric longitudinal effect.
  • the piezoelectric longitudinal effect refers to the action of generating charges on the surface of the piezoelectric body in the direction of the charge generation axis when an external force is applied to the stress application axis in the same direction as the charge generation axis of the piezoelectric body.
  • the piezoelectric element 10 according to the present embodiment is housed in the housing 31 so that the center line direction is the direction of the stress application axis.
  • the piezoelectric element 10 may be configured using a piezoelectric lateral effect.
  • the piezoelectric transverse effect is an action in which charges are generated on the surface of the piezoelectric body in the direction of the charge generation axis when an external force is applied to the stress application axis at a position orthogonal to the charge generation axis of the piezoelectric body.
  • a plurality of thin piezoelectric bodies may be stacked, and by stacking in this way, the charge generated in the piezoelectric bodies can be efficiently collected to increase the sensitivity of the sensor.
  • a langasite crystal (a langasite, a langagate, a langanite, LGTA) having a piezoelectric longitudinal effect and a piezoelectric transverse effect, quartz, gallium phosphate, or the like may be used.
  • a langasite single crystal is used as the piezoelectric body.
  • the support member 65 is a cylindrical member in which a plurality of holes having different diameters are formed inside from the front end side to the rear end side, and the outer peripheral surface also has a plurality of outer peripheries.
  • the hole includes a first hole formed in order from the front end side to the rear end side, and a second hole having a larger hole diameter than the hole diameter of the first hole.
  • the diameter of the first hole is larger than the outer diameter of the base end portion of the projecting portion 55 a of the second electrode portion 55, and the distal end portion of the projecting portion 55 a is exposed to the second hole of the support member 65.
  • the hole diameter of the second hole is larger than the outer diameter of the distal end portion having the insertion hole 22a of the coil spring 70 in the conductive member 22 of the signal processing unit 200 described later. Further, the hole diameter of the second hole is smaller than the outer diameter of the end 23a of the insulating member 23 of the signal processing unit 200 described later, and the end 23a of the insulating member 23 is fitted into the second hole with an interference fit. (Press-fit) Thereby, the support member 65 functions as a member that supports the tip portion of the insulating member 23.
  • the outer peripheral surface of the support member 65 has three outer peripheral surfaces with different diameters, and the first outer peripheral surface on the tip side is a relief portion when the pressure member 80A is fixed. Further, the second outer peripheral surface forms a ring-shaped protrusion 65a, and the outer periphery is for fitting the pressurizing member 80A, which is larger than the inner peripheral surface of the pressurizing member 80A, and the pressurizing member 80A is tight. It is fitted (press-fit) with a fit. At this time, the ring-shaped protrusion 80d on the rear end side of the pressure member 80A is hooked and positioned by the ring-shaped protrusion 65a of the support member 65. The third outer peripheral surface is fitted to the inner periphery on the rear end side of the housing 31 and fixed by welding.
  • the support member 65 is preferably made of stainless steel.
  • the pressure member 80A is a cylindrical member that covers the outer periphery of the pressure transmission member 50, the piezoelectric element 10, the second electrode portion 55, the insulating ring 60, the support member 65, and the like. 80d, a cylindrical part 80c, and a ring-shaped protrusion 80d on the rear end side.
  • the cylindrical portion 80a is fitted to the outer peripheral portion of the pressure transmission member 50 and is fixed by welding.
  • the cylindrical portion 80b is a thin spring portion for applying a preload to the piezoelectric element 10.
  • a part of the cylindrical portion 80 c is fitted with a ring-shaped protrusion 65 a formed on the support member 65.
  • the cylindrical portion 80d of the pressure member 80A is hooked and positioned with respect to the ring-shaped protrusion 65a of the support member 65.
  • the material of the pressure member is preferably made of stainless steel.
  • the coil spring 70 has an inner diameter that is slightly smaller than the outer diameter of the tip of the protruding portion 55a of the second electrode portion 55, and the outer diameter is smaller than the diameter of the insertion hole 22a of the conductive member 22 described later.
  • the tip of the protruding portion 55 a of the second electrode portion 55 is inserted into the coil spring 70 by light press-fitting, and the coil spring 70 is inserted into the insertion hole 22 a of the conductive member 22.
  • the length of the coil spring 70 is set so as to be compressed between the second electrode portion 55 and the insertion hole 22 a, and conducts the pressure signal from the piezoelectric element 10 to the conductive member 22.
  • the material of the coil spring 70 is preferably made of an alloy having high elasticity and excellent durability, heat resistance, touch resistance, etc., and having a surface plated with gold to enhance electrical conductivity.
  • the holding member 300 is a thin cylindrical member, and is provided with a protruding portion 300a protruding inward from the inner peripheral surface at the rear end portion. After the holding member 300 is mounted on the housing 32, the holding member 300 is caulked by pressurizing a portion corresponding to the concave portion 335 a provided in the fifth outer peripheral surface 335 from the outside. Thereby, the holding member 300 is fixed with respect to the housing
  • the circuit board unit 21 is protected by being electrically connected (GND).
  • FIG. 19A shows an assembly procedure of the piezoelectric element part inside the pressure detection unit 100
  • FIG. 19B shows an assembly procedure of the pressure detection unit 100
  • FIG. The procedure for assembling the pressure detection unit 100 is shown in FIG.
  • the welded portion is marked with “ ⁇ ” for convenience, but does not indicate the actual shape, but merely indicates the “welded portion”. The same applies to the following description.
  • FIGS. 19 (a), (b), (c) [Description of Assembly Procedure of Pressure Detection Unit 100: FIGS. 19 (a), (b), (c)]
  • the pressure member 80 ⁇ / b> A is attached to the support member 65.
  • the cylindrical portion of the pressure member 80A is passed from the rear end side of the support member 65.
  • the ring-shaped protrusion 65a formed on the outer periphery of the support member 65 is pushed in until the ring-shaped protrusion 80d formed on the inner periphery of the pressure member 80A is hooked.
  • the outer diameter of the ring-shaped protrusion 65a formed on the support member 65 is larger than the inner diameter of the corresponding pressure member 80A and is fitted (press-fit) with an interference fit.
  • the insulating ring 60, the second electrode portion 55, the piezoelectric element 10, and the pressure transmitting portion (50) of the diaphragm 45 are inserted in this order from the distal end side of the pressure member 80A.
  • a preload is applied.
  • an assembly jig (not shown) may be used. Set the aforementioned assembly on the assembly jig.
  • the thin spring portion 80b formed in the central portion of the pressure member 80A (FIG. 18 ( The load is applied in the direction (center line direction) in which the pressure member 80A is extended using the step b).
  • a method of irradiating a laser beam over the entire circumference from the outside of the pressure member 80A toward the center line direction may be adopted.
  • the laser beam may be irradiated on the entire circumference, or spot irradiation may be performed at equal intervals in the circumferential direction.
  • spot irradiation may be performed at equal intervals in the circumferential direction.
  • the step of the thin spring portion 80b formed on the pressing member 80A is used as a method of applying a load in the direction of extending the pressing member 80A (center line direction). You may use it, providing a notch. As a result, a preload acts on the piezoelectric element 10 and is fixed.
  • the above-described piezoelectric element portion is assembled in the housing 31.
  • the piezoelectric element portion is inserted from the front end side of the housing 31.
  • the diaphragm 45 is fitted (press-fitted) into the end surface 31a of the housing 31 with an interference fit using the entry portion 41a as a guide.
  • the engaging portion is fixed with the end surface 31a of the housing 31 and the abutting surface 41b of the diaphragm in contact with each other (welding 2).
  • the housing 31 and the support member 65 are fixed (welding 3). Thereby, a pressure detection part is assembled.
  • step (c) of FIG. 19 the pressure detection unit assembled in step (b) is assembled in the housing 32.
  • the coil spring 70 is assembled in advance to the protruding portion 55a formed in the second electrode portion.
  • the second outer peripheral portion of the housing 31 of the pressure detection unit assembled in the step (b) is inserted into the hole portion 321 of the housing 32 and is fitted (press-fitted) with an interference fit.
  • the assembly in step (b) is fixed in a state where the vertical surface 315b of the protruding portion 315 of the housing 31 is in contact with the front end surface of the housing 32 (welding 4). Thereby, the pressure detection unit 100 is completed.
  • the housing 32 When the combustion pressure sensor 5H configured as described above is attached to the cylinder head 4 (see FIG. 2), the housing 32 has a female screw portion provided in the communication hole 4a of the cylinder head from its male screw portion 332a. It is electrically connected to the cylinder head 4 through 4e and is grounded to the vehicle body.
  • the combustion pressure generated in the combustion chamber C acts on the diaphragm 45 at the tip of the combustion pressure sensor 5H, acts on the piezoelectric element 10 via the pressure transmission portion (50), and becomes the combustion pressure. A corresponding charge is generated.
  • the electric charge generated in the piezoelectric element 10 is supplied to the circuit board unit 21, amplified by the circuit board unit 21, and a voltage corresponding to the electric charge is supplied to the control device 6 through the connection pin and the transmission cable 8. .
  • the cylindrical part 80b of the pressing member 80A is a thin spring part for applying a preload to the piezoelectric element 10, it is not limited to such a form. Between the fixed portions of the pressure member, the width of the cylindrical portion 80b and the position and thickness of the thin portion in the center line direction can be freely configured.
  • the load is applied in the direction in which the pressure member 80A is extended using the step of the thin-walled spring portion 80b” is not limited thereto.
  • a ring-shaped groove may be provided in the cylindrical portion 80a of the pressure member 80A, and a load may be applied in the extending direction using the groove.
  • a notch may be provided in the cylindrical portion 80a, and a load may be applied in the extending direction using the notch.
  • FIG. 20A is an enlarged cross-sectional view of the pressure detection unit 100 of the combustion pressure sensor 5I using the pressurizing member 80B
  • FIG. 20B is a partial cross-sectional view of the pressurizing member 80B.
  • the combustion pressure sensor 5I according to the eleventh embodiment is different from the combustion pressure sensor 5H according to the tenth embodiment in that, in the pressurizing member 80B, the thin spring portion that is a load adjusting portion is positioned at the position of the tubular portion 80b ( What is in the center portion is that it is disposed at the position of the cylindrical portion 80c (on the support member 65 side). As a result, the position of the spring portion is slightly away from the combustion chamber C. Since the other basic configuration is the same as that of the tenth embodiment, the same elements are denoted by the same reference numerals, and redundant description is omitted.
  • the assembly procedure of the eleventh embodiment differs only in the position of the load adjusting portion of the pressing member 80B shown in FIGS. 19 (a), 19 (b), and 19 (c).
  • FIG. 19A the cylindrical portion of the pressure member 80B is passed from the rear end side of the support member 65.
  • the ring-shaped protrusion 65a formed on the outer periphery of the support member 65 is pushed in until the ring-shaped protrusion 80d formed on the inner periphery of the pressure member 80B is hooked.
  • the outer diameter of the ring-shaped protrusion 65a formed on the support member 65 is larger than the hole diameter of the ring-shaped protrusion 80d formed on the inner periphery of the pressure member 80B and is fitted (press-fitted) with an interference fit.
  • the insulating ring 60, the second electrode portion 55, the piezoelectric element 10, and the diaphragm 45 are inserted in this order from the distal end side of the pressure member 80B.
  • the position of the step is different, so the jig needs to be changed.
  • Other assembly procedures are the same as those shown in FIGS. 19B and 19C, and thus redundant description is omitted.
  • the combustion pressure sensor 5I according to the eleventh embodiment is obtained.
  • FIG. 21A is an enlarged cross-sectional view of the pressure detector 100 of the combustion pressure sensor 5J using the pressurizing member 80C
  • FIG. 21B is a front view of the pressurizing member 80C.
  • the combustion pressure sensor 5J of the twelfth embodiment is different from the combustion pressure sensor 5H of the tenth embodiment in that the thin spring portion that is the load adjusting portion of the pressurizing member 80B is a cylinder.
  • the load adjustment part of the pressurization member 80C is provided in the position of the cylindrical part 80c, and has the spring structure which consists of a some notch and a some board part.
  • the spring constant smaller (the change in load with respect to the displacement amount) is smaller than that of the thin spring structure. Since the other basic configuration and assembly procedure are the same as those in the tenth embodiment, the same elements are denoted by the same reference numerals, and redundant description is omitted. Thereby, the combustion pressure sensor 5J according to the twelfth embodiment is obtained.
  • the load adjustment part of a pressurization member can design a spring with a smaller load change with respect to a displacement amount. That is, it is possible to obtain a spring means with less load variation with respect to the dimensional variation in the center line direction of the pressure transmission member, the piezoelectric element, the second electrode, the insulating ring, and the support member.
  • a more accurate preload can be applied, and the sensitivity and linearity can be improved and a highly accurate pressure signal can be obtained.
  • the spring portion provided on the pressurizing member is located away from the pressure receiving portion, the temperature of the combustion chamber is hardly transmitted to the spring portion. Therefore, the influence of heat on the spring characteristics can be suppressed, and short-term temperature drifts such as inter-cycle temperature drift can be suppressed. Thereby, a highly accurate pressure signal can be obtained.
  • FIG. 22A is an enlarged cross-sectional view of the pressure detection unit 100 of the combustion pressure sensor 5K using the pressurizing member 80D
  • FIG. 22B is a partial cross-sectional view of the pressurizing member 80D
  • FIG. 23 is a cross-sectional view showing an assembly procedure of the pressure detector 100 of the combustion pressure sensor 5K.
  • the combustion pressure sensor 5K according to the thirteenth embodiment differs from the combustion pressure sensor 5I according to the eleventh embodiment (FIG. 20) in the structure of the pressure member 80D.
  • the fixing portion with 50) is fixed by latching, and the fixing portion with the support member 65 is fixed by welding. Since other basic configurations and assembly procedures are the same as those in the eleventh embodiment, the same elements are denoted by the same reference numerals, and duplicate descriptions are partially omitted.
  • the pressure transmission member (50) and the diaphragm (40) are configured separately.
  • the pressure transmitting member (50) is provided with a latching step for latching the pressure member at a part thereof.
  • a ring-shaped protrusion 80d provided on the tip side of the pressure member 80D can be hooked to the step. Further, there is no ring-shaped projection for hooking with the support member 65 on the rear end side of the pressure member 80D, and the pressure member 80D is configured to be fixed by welding.
  • the step of the cylindrical portion 80c formed on the support member 65 side of the pressure member 80D is used to apply a load in the direction (center line direction) in which the pressure member 80D is extended.
  • the engaging portion between the cylindrical portion of the pressure member 80D and the support member 65 is fixed (welding 1). Thereby, a piezoelectric element part is assembled.
  • the central projecting portion of the diaphragm (40) and the central projecting portion of the pressure transmission member (50) are concentrically fixed (welding 2).
  • the diaphragm is integrated, and the piezoelectric element 10 is preloaded and fixed.
  • the above-described piezoelectric element portion is assembled to the housing 31.
  • the piezoelectric element portion is inserted from the front end side of the housing 31.
  • the diaphragm 45 is fitted (press-fitted) into the end surface 31a of the housing 31 with an interference fit using the entry portion 41a as a guide.
  • the engaging portion is fixed with the end surface 31a of the housing 31 and the abutting surface 41b of the diaphragm in contact with each other (welding 3).
  • the housing 31 and the support member 65 are fixed (welding 4). Thereby, a pressure detection part is assembled.
  • step (c) of FIG. 23 the pressure detection unit assembled in step (b) is assembled in the casing 32.
  • the coil spring 70 is assembled in advance to the protruding portion 55a formed in the second electrode portion.
  • the second outer peripheral portion of the housing 31 of the pressure detection unit assembled in the step (b) is inserted into the hole portion 321 of the housing 32, and fitted (press-fit) with an interference fit.
  • the assembly in step (b) is fixed in a state where the vertical surface 315b of the protruding portion 315 of the housing 31 is in contact with the front end surface of the housing 32 (welding 5). Thereby, the pressure detection unit 100 is completed, and the combustion pressure sensor 5K according to the thirteenth embodiment is obtained.
  • the position of the spring portion is the central portion or the support member side, but is not limited to such a form.
  • the position of the spring portion may be on the diaphragm side.
  • the spring part of the pressurizing member is a thin spring part or a spring part composed of a plurality of notches and a plurality of plate parts, it is not limited to such a form.
  • the spring portion may have a coiled spring structure, a bellows-like spring structure, or any other spring structure.
  • the spring part made thickness thin and provided the level
  • the spring part and the fixed part may have the same thickness, or conversely, the spring part may be thick.
  • either the fixing method by latching or the fixing method by welding may be adopted for the fixing portion on the diaphragm side and the fixing portion on the support member side.
  • SYMBOLS 1 Internal combustion engine, 2 ... Cylinder block, 2a ... Cylinder, 3 ... Piston, 4 ... Cylinder head, 4a ... Communication hole 5, 5s, 5A, 5B, 5C, 5D, 5E, 5F, 5G, 5H, 5I, 5J, 5K ... Combustion pressure sensor, 6 ... Control device, 7 ... Sealing member, 8 ... Transmission cable, 8a ... Connector, 10 ... Piezoelectric element, 10a ... First electrode side end surface, 21 ... Circuit board part, 22 ... Conductive member 23 ... insulating member 24 ... O-ring 30 ... housing 31 ... first housing (housing) 32 ...
  • second housing (housing) 40 diaphragm 45 ... integrated diaphragm 50 ... 1st electrode part, pressure transmission member, 55 ... 2nd electrode part, 60 ... insulating ring, 65 ... support member, 70 ... coil spring, 71 ... 1st seal member, 72 ... 2nd seal member, 80 , 8 A, 80B, 80C, 80D, 80E, 80F, 80G ... pressure member, 100 ... pressure detection unit, 200 ... signal processing unit, 300 ... holding member

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

La présente invention concerne un dispositif de détection de la pression qui est doté : d'un logement en forme de tube (30) ; d'une membrane (40) qui est disposée sur le côté extrémité avant du logement (30) ; d'un élément piézoélectrique (10) qui est disposé à l'intérieur du logement (30) le long de la direction axiale sur le côté d'extrémité arrière de la membrane (40) et qui détecte une pression exercée sur celle-ci par l'intermédiaire de la membrane (40) ; d'une première section électrode (50) qui est disposée à l'intérieur du logement (30) le long de la direction axiale entre la membrane (40) et l'élément piézoélectrique (10) de façon à être en contact avec l'élément piézoélectrique (10) et qui transmet la pression à l'élément piézoélectrique (10), la pression agissant sur la première section électrode (50) par l'intermédiaire de la membrane (40) ; d'un élément de support (65) qui soutient l'extrémité arrière de l'élément piézoélectrique (10) ; et d'un élément de mise sous pression (80) qui est fixé au logement (30) ou à l'élément de support (65) de façon à mettre sous pression la première section électrode (50) dans la direction axiale du logement (30), ce qui applique une charge à l'élément piézoélectrique (10).
PCT/JP2013/059740 2012-03-29 2013-03-29 Dispositif de détection de la pression, et moteur à combustion interne doté du dispositif de détection de la pression WO2013147260A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP2012-076147 2012-03-29
JP2012076147A JP5820759B2 (ja) 2012-03-29 2012-03-29 圧力検出装置の製造方法、圧力検出装置付き内燃機関の製造方法
JP2012-188420 2012-08-29
JP2012188420A JP5975793B2 (ja) 2012-08-29 2012-08-29 燃焼圧センサ
JP2012-191950 2012-08-31
JP2012191950A JP5978073B2 (ja) 2012-08-31 2012-08-31 燃焼圧センサ

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015147061A1 (fr) * 2014-03-27 2015-10-01 シチズンファインテックミヨタ株式会社 Capteur de pression de combustion et son procédé de fabrication
EP3124944A1 (fr) * 2015-07-31 2017-02-01 Kistler Holding AG Capteur de pression piezoélectrique
EP3124943A1 (fr) * 2015-07-31 2017-02-01 Kistler Holding AG Capteur de pression piezoelectrique et procede de fabrication dudit capteur de pression piezoelectrique
EP3124945A1 (fr) * 2015-07-31 2017-02-01 Kistler Holding AG Capteur de pression piezoélectrique
CN107478380A (zh) * 2016-06-07 2017-12-15 皮埃佐克莱斯特先进传感器有限公司 用于测量高压力的压电式压力传感器
EP3290888A1 (fr) * 2016-09-02 2018-03-07 Kistler Holding AG Capteur de pression pour temperatures de fonctionnement elevees
CN109964107A (zh) * 2016-10-26 2019-07-02 日本特殊陶业株式会社 压力传感器
US10378988B2 (en) 2015-07-31 2019-08-13 Kistler Holding Ag Pressure sensor and process of manufacturing same
US10458873B2 (en) 2015-07-31 2019-10-29 Kistler Holding Ag Pressure sensor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6348296B2 (fr) * 1981-01-22 1988-09-28 Nippon Jidosha Buhin Sogo Kenkyusho Kk

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6348296B2 (fr) * 1981-01-22 1988-09-28 Nippon Jidosha Buhin Sogo Kenkyusho Kk

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JPWO2015147061A1 (ja) * 2014-03-27 2017-04-13 シチズンファインデバイス株式会社 燃焼圧センサ及びその製造方法
US10458328B2 (en) 2014-03-27 2019-10-29 Citizen Finedevice Co., Ltd. Welded combustion pressure sensor and method of manufacturing same
WO2015147061A1 (fr) * 2014-03-27 2015-10-01 シチズンファインテックミヨタ株式会社 Capteur de pression de combustion et son procédé de fabrication
EP3124945A1 (fr) * 2015-07-31 2017-02-01 Kistler Holding AG Capteur de pression piezoélectrique
EP3124943A1 (fr) * 2015-07-31 2017-02-01 Kistler Holding AG Capteur de pression piezoelectrique et procede de fabrication dudit capteur de pression piezoelectrique
CN106404268A (zh) * 2015-07-31 2017-02-15 基斯特勒控股公司 压力传感器和制造这种压力传感器的方法
CN106404278A (zh) * 2015-07-31 2017-02-15 基斯特勒控股公司 压电式压力传感器
CN106404265A (zh) * 2015-07-31 2017-02-15 基斯特勒控股公司 压电式压力传感器
EP3124946A1 (fr) * 2015-07-31 2017-02-01 Kistler Holding AG Capteur de pression et procédé de fabrication d'un tel capteur de pression
US10458873B2 (en) 2015-07-31 2019-10-29 Kistler Holding Ag Pressure sensor
CN106404265B (zh) * 2015-07-31 2020-06-19 基斯特勒控股公司 压电式压力传感器
US10006827B2 (en) 2015-07-31 2018-06-26 Kistler Holding Ag Piezoelectric pressure sensor and process of manufacturing same
US10101227B2 (en) 2015-07-31 2018-10-16 Kistler Holding Ag Piezoelectric pressure sensor
US10161823B2 (en) 2015-07-31 2018-12-25 Kistler Holding Ag Piezoelectric pressure sensor
US10337941B2 (en) 2015-07-31 2019-07-02 Kistler Holding Ag Pressure sensor
EP3124944A1 (fr) * 2015-07-31 2017-02-01 Kistler Holding AG Capteur de pression piezoélectrique
US10378988B2 (en) 2015-07-31 2019-08-13 Kistler Holding Ag Pressure sensor and process of manufacturing same
CN107478380B (zh) * 2016-06-07 2021-06-29 皮埃佐克莱斯特先进传感器有限公司 用于测量高压力的压电式压力传感器
CN107478380A (zh) * 2016-06-07 2017-12-15 皮埃佐克莱斯特先进传感器有限公司 用于测量高压力的压电式压力传感器
EP3290888A1 (fr) * 2016-09-02 2018-03-07 Kistler Holding AG Capteur de pression pour temperatures de fonctionnement elevees
EP3534130A4 (fr) * 2016-10-26 2020-06-24 Mikuni Corporation Capteur de pression
US10969286B2 (en) 2016-10-26 2021-04-06 Mikuni Corporation Pressure sensor
CN109964107A (zh) * 2016-10-26 2019-07-02 日本特殊陶业株式会社 压力传感器

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