JP6625001B2 - Functional parts and how to remove them - Google Patents

Description

  The present invention relates to a functional component for an internal combustion engine that can be inserted into a mounting hole communicating with a combustion chamber of the internal combustion engine, and a method for removing the functional component.

  DESCRIPTION OF RELATED ART Conventionally, the functional component provided with the housing which can be inserted in the attachment hole provided in the cylinder head of the internal combustion engine, for example, a fuel injection device, a spark plug, a glow plug, etc. is generally known. In recent years, a pressure detecting device that detects a pressure acting on a combustion chamber of an internal combustion engine is also one of the functional components.

  The functional component has a generally columnar housing, and is used by being inserted into a mounting hole of a cylinder head in which the combustion chamber of the internal combustion engine communicates with the outside. As a pressure detecting device exemplified as one of such functional components, the structure thereof is disclosed in Patent Document 1, for example. The pressure detecting device includes a cylindrical housing, and a diaphragm head at a front end of the housing corresponding to a combustion chamber side of the internal combustion engine, and a detecting portion made of a piezoelectric element is disposed behind the diaphragm head and inside the housing. Have been. This detector detects the pressure in the combustion chamber acting via the diaphragm head, and measures the combustion pressure. The pressure detecting device is mounted and functions along a mounting hole provided in the cylinder head.

  Patent Document 2 discloses a configuration including two seal members for sealing between an outer surface of a housing of a pressure detecting device and a mounting hole provided in an internal combustion engine and communicating with a combustion chamber and the outside. Among the seal members, the seal member arranged on the combustion chamber side is locked to the step portion by being fitted into a step portion formed of a groove provided on the outer surface of the housing, so that the pressure detection device and the mounting hole of the cylinder head are connected. Combustion gas is prevented from flowing into the gap between them.

JP 2008-19059 A JP 2013-194573 A

  The functional component mounted on the cylinder head of the internal combustion engine is not limited to the pressure detecting device, but includes a seal member between the functional component and the cylinder head. It suppresses the inflow of combustion gas. When removing the functional component, the seal member disposed between the functional component and the cylinder head may remain in the mounting hole without being removed at the same time as the functional component.

  In particular, in a pressure detecting device exemplified as one of the functional components, a seal member is disposed near a combustion chamber, so that a deposit is deposited around the seal member and the mounting hole and the seal member are easily fixed. . Therefore, even if, for example, a step portion for locking the seal member is provided in the housing portion of the functional component, the seal member cannot be sufficiently locked when removing the functional component, and The seal member often comes off from the part.

  In order to take out the seal member left in the mounting hole, it is necessary to use a special tool or jig for taking out the seal member and perform a complicated take-out operation. A particularly problematic point is that the inner surface of the mounting hole may be damaged during the removal operation, and furthermore, the sealing surface on the inner surface side of the mounting hole with which the sealing member contacts may be damaged. In such a case, it is not possible to sufficiently maintain the sealing property between the newly attached functional component and the sealing material and the mounting hole, and there is a possibility that the combustion gas may leak.

  The present invention has been made in view of the above problems, and when removing a functional component from a mounting hole of a cylinder head, the sealing member is not left in the mounting hole, or is mounted even if it remains in the mounting hole. It is an object of the present invention to provide a functional component capable of taking out a sealing member without damaging the inside of the hole and a method of removing the functional component.

(1) According to one aspect of the present invention,
A functional component attached to a mounting hole communicating with a combustion chamber of an internal combustion engine, wherein the functional component includes a housing that can be inserted into the mounting hole, and a seal member that seals between the mounting hole and an outer surface of the housing. A first locking portion for stopping is provided on an outer side surface of the housing, and the outer side surface of the housing is configured such that, when the functional component is mounted on the internal combustion engine, the combustion chamber side of the functional component is located on the tip side. When the direction opposite to the distal end is defined as the rear end, the first locking portion is different from the first locking portion that locks the seal member on at least one of the distal end side and the rear end side of the first locking portion. , And the first and second locking portions are functional parts formed of grooves .

(2) The second locking portion is a functional component having a greater locking force of the seal member than the first locking portion.

(3) before Symbol second locking portion and functional parts are provided on the front end side of the first locking portion.

( 4 ) The second locking portion is a functional component provided rearward of the first locking portion.

( 5 ) The second locking portion is a functional component provided in plurality.

( 7 ) The second locking portion is a functional component provided on the front end side and the rear end side with the first locking portion interposed therebetween.

( 7 ) A method for removing a functional component attached to a mounting hole communicating with a combustion chamber of an internal combustion engine, wherein the functional component is provided between a housing insertable into the mounting hole and an outer surface of the housing. A first locking portion for locking a seal member for sealing the first member and a second locking portion different from the first locking portion for locking the seal member, on the outer surface of the housing; When the functional component is attached to the internal combustion engine, when the combustion chamber side of the functional component is a front end side and a direction opposite to the front end side is a rear end side, the second locking portion is the first locking portion. Part is provided on the rear end side, the seal is locked to the second locking portion by pushing the functional component to the distal end side, and then the functional component is pulled out to the rear end side. how to remove functional components removed from the mounting hole To.

  According to the present invention, apart from the first locking portion for locking the seal member, the second locking portion for locking the seal member detached from the first locking portion is provided on the outer surface of the functional component. Thus, the seal member can be taken out without being left in the mounting hole of the cylinder head, and can be easily taken out without damaging the mounting hole.

1 is a schematic configuration diagram of an internal combustion engine according to a first embodiment of the present invention. FIG. 2 is a diagram for explaining the pressure detecting device according to the first embodiment of the present invention, and is an enlarged view of a part II in FIG. FIG. 4 is a diagram for explaining the pressure detecting device according to the first embodiment of the present invention, and is a cross-sectional view of an IV-IV portion in which a V portion in FIG. 2 is enlarged. FIG. 7 is a diagram for explaining a pressure detecting device according to a second embodiment of the present invention, and is an enlarged view of a tip end portion of the pressure detecting device mounted on a cylinder head. It is a figure for explaining the pressure detecting device concerning Example 3 of the present invention, and is an enlarged drawing of the tip of the pressure detecting device attached to the cylinder head. It is a figure for explaining the pressure detecting device concerning Example 4 of the present invention, and is an enlarged drawing of the tip of the pressure detecting device attached to the cylinder head. The figure for demonstrating the removal method of the pressure detection apparatus in case there is a 2nd latch part in a rear end side. The figure for demonstrating the removal method of the pressure detection apparatus in case there is a 2nd locking part in a front-end | tip side.

Here, a pressure detecting device will be described as an example of the functional component, and a functional component and a method of removing the functional component of the present invention will be described with reference to the drawings.
(Example 1)
FIG. 1 is a schematic configuration diagram of an internal combustion engine according to Embodiment 1 of the present invention. As shown in FIG. 1, the internal combustion engine 1 includes a cylinder block 2 having a cylinder 2a, a piston 3 reciprocating in the cylinder 2a, and a combustion chamber C fastened to the cylinder block 2 together with the cylinder 2a, the piston 3, and the like. And a cylinder head 4 to be formed. Further, the cylinder head 4 forming the combustion chamber C is provided with a mounting hole 4a formed on the wall surface of the cylinder head 4 forming the combustion chamber and communicating the combustion chamber C with the outside. The internal combustion engine 1 is mounted in the mounting hole 4 a of the cylinder head 4 and detects a pressure in the combustion chamber C. The pressure detection device 5 has a substantially cylindrical shape, and is interposed between the pressure detection device 5 and the cylinder head 4. And a seal portion for maintaining the airtightness in the combustion chamber C. Hereinafter, the center line direction of the substantially columnar pressure detecting device 5 is simply referred to as the center line direction. In the following description, the combustion chamber C side of the pressure detection device 5 is referred to as a front end side, and the opposite direction is referred to as a rear end side of the pressure detection device 5. The seal portion includes a first seal member 71 attached to a rear end side of the pressure detection device 5 and a second seal member 72 attached to a front end side.

  FIG. 2 is a diagram for explaining the pressure detecting device according to the first embodiment of the present invention, and is an enlarged view of a portion II in FIG. As shown in FIG. 2, the mounting hole 4 a of the cylinder head 4 includes a first hole 4 b from the combustion chamber C side, and an inclined portion 4 c whose diameter gradually increases from the hole diameter of the first hole 4 b. A second hole 4d having a diameter larger than the diameter of the first hole 4b. A female screw 4e into which a male screw 332a of the housing 30 to be described later formed in the pressure detecting device 5 is formed in a peripheral wall forming the second hole 4d.

  The pressure detecting device 5 includes a piezoelectric element (not shown) that converts the pressure in the combustion chamber C into an electric signal, and a housing 30 that is cylindrical and has a cylindrical hole formed therein for accommodating the piezoelectric element and the like. And The housing 30 includes a first housing 31 provided on a front end side and a second housing 32 provided on a rear end side.

  A diaphragm head 40 for receiving the pressure of the combustion chamber C is provided on the distal end side end surface of the first housing 31. The pressure received by the diaphragm head 40 is transmitted to the piezoelectric element inside the housing 30. The first housing 31 and the diaphragm head 40 are joined by a joining method such as laser welding over the entire area in the circumferential direction.

  Further, the first housing 31 includes a front side surface 31b and a rear end side surface 315 having an outer diameter larger than the front side surface 31b, and a connecting portion between the front side surface 31b and the rear side surface 315 includes a front side. Has a slope 315a as an example of a tapered shoulder portion whose outer diameter gradually increases toward the rear end side.

  Further, on the inclined surface 315a side of the front end side surface 31b, a step portion 31bt formed of a groove formed over the entire area in the circumferential direction is formed. The second seal member 72 is fitted into the step portion 31bt. The step portion 31bt functions as a first locking portion that locks the second seal member 72 to the first housing.

  Furthermore, a step portion 315at formed of a groove formed over the entire area in the circumferential direction is formed on the inclined surface of the first housing 31. The step portion 315at functions as a second locking portion that locks and takes out the second seal member 72 detached from the step portion 31bt when the pressure detecting device 5 is removed from the mounting hole 4a, for example.

  The outer peripheral surface 330 of the second housing 32 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 from the front end side to the rear end side. A third outer peripheral surface 333 having an outer diameter larger than the outer diameter of 332 and a fourth outer peripheral surface 334 having an outer diameter larger than the outer diameter of the third outer peripheral surface 333 are provided. A male screw 332a that is screwed into the female screw 4e of the cylinder head 4 is formed at the tip of the second outer peripheral surface 332. The first seal member 71 is fitted into the third outer peripheral surface 333 with a loose fit. The rear end of the fourth outer peripheral surface 334 is formed as a regular hexagonal prism having six chamfers at equal intervals in the circumferential direction. When the pressure detecting device 5 is attached to and detached from the cylinder head 4, a tightening tool is fitted into the portion, and the rotational force applied to the tool is transmitted.

  When the pressure detecting device 5 is inserted into the mounting hole 4a of the cylinder head 4, the female screw 4e of the mounting hole 4a and the male screw 332a are screwed together, and the inclined portion 4c of the mounting hole 4a and the inclined portion 315a of the first housing 31 are screwed. The end face 4f of the peripheral wall forming the mounting hole 4a in the direction of tightening of the pressure detecting device 5 and the fourth outer peripheral surface 334 of the housing 30 of the pressure detecting device 5 are provided. The first seal member 71 is sandwiched between the end surface 334a on the distal end side of the formed cylindrical portion, and the space between the cylinder head 4 and the pressure detection device 5 is sealed to be mounted in the mounting hole 4a.

  The first seal member 71 has a rectangular ring shape in cross section. The first seal member 71 is sandwiched between the end face 4f of the cylinder head 4 and the end face 334a of the pressure detection device 5, so that the combustion gas is released from the combustion engine. 1 has a function of preventing leakage to the outside. In addition, the first seal member 71 has a function of determining a position in the central axis direction when the pressure detecting device 5 is mounted on the mounting hole 4a.

  Hereinafter, the internal structure and the seal portion of the pressure detection device 5 will be described. FIG. 3 is a diagram for explaining the pressure detecting device according to the first embodiment of the present invention, and is a cross-sectional view of an IV-IV portion obtained by enlarging a V portion in FIG. 2. As shown in FIG. 3, the pressure detecting device 5 has a piezoelectric element 10 for converting a received pressure into an electric signal, and a cylindrical hole for accommodating the piezoelectric element 10 and the like therein. And a housing 30. The pressure detecting device 5 is provided so as to close an opening on the distal end side of the housing 30, and is provided between the diaphragm head 40 and the piezoelectric element 10 where the pressure in the combustion chamber C acts. The piezoelectric element 10 includes 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.

  The pressure detecting device 5 is provided on an insulating ring 60 that electrically insulates the second electrode portion 55 and a rear end side of the insulating ring 60, and applies a pressure applied to the diaphragm via a member such as a piezoelectric element. A support member 65 for receiving, a conductive member 22 electrically connected to the second electrode portion 55, and a cover member 23 for electrically insulating the conductive member 22 through the housing 30 and supporting the conductive member 22; , Is provided.

    Next, the seal portion on the tip side of the pressure detecting device 5 will be specifically described. The second seal member 72 has a substantially C-shaped ring shape with a cross section having an opening on the inside, and is fitted into a step portion 31bt, which is a groove of the outer peripheral surface 31b at the distal end side. The inner diameter of the second seal member 72 is set to be slightly smaller than the outer shape of the side surface 31b of the first housing of the pressure detecting device 5 (the outer diameter of the step portion 31bt in this embodiment) before being attached. ing. Therefore, the second seal member 72 is hardly displaced during the operation of the internal combustion engine 1 and the workability when attaching and detaching the pressure detecting device 5 to and from the mounting hole 4a of the cylinder head 4 is improved. The second seal member 72 is disposed in a space H formed between the inclined surface 315a and the side surface 31b of the pressure detecting device 5, and the inclined portion 4c of the cylinder head 4 and the inner wall of the second hole 4d. By being sandwiched between the inclined portion 4c and the inclined portion 315a, the combustion gas is prevented from flowing into the gap between the pressure detecting device 5 and the cylinder head 4 on the rear end side of the second seal member 72.

  Next, specific shapes of the step portion 31bt as the first locking portion of the second seal member 72 and the step portion 315at as the second locking portion will be described. The step portion 31bt serving as the first locking portion is a groove formed over the entire area of the first housing 31 in the circumferential direction, and has a rectangular cross section. The step portion 315at serving as the second locking portion is a groove formed over the entire circumferential area of the inclined surface 315a of the first housing 31, and has a trapezoidal cross section. The groove width of the step portion 315at is the same as the groove width of the step portion 31bt, and the minimum groove depth of the step portion 315at is deeper than the groove depth of the step portion 31bt. Further, the diameter of the first housing 31 on the groove bottom surface of the step portion 315at is larger than the diameter of the first housing 31 on the groove bottom surface of the step portion 31bt.

  Here, the locking force when the second seal member 72 is locked to the step 31bt and the step 315at will be compared. The step portion 315at has a deeper groove depth than the step portion 31bt, so that when a force in the central axis direction is applied to the second seal member 72, the second seal member 72 is easily caught on the step. (2) The force for stopping the seal member 72 in the groove is large.

  In addition, since the step portion 315at has a larger diameter at the bottom of the groove than the step portion 31bt, when the second seal member 72 is engaged with the step portion 315at, the inner diameter of the second seal member 72 is increased with respect to the inner diameter of the second seal member 72. Therefore, a radial restraining force, which is a reaction force of the force, is generated. Thus, even when a force in the central axis direction is applied to the second seal member 72, the step portion 315 at increases the force for stopping the second seal member 72 in the groove by the restraining force. From the above, the second locking portion is configured to have a higher locking force on the second seal member 72 than the first locking portion. Although the step portion 315at in this embodiment has been described as a trapezoidal groove, the present invention is not limited to this shape. For example, even if the cross section of the groove is a U-shape, a V-shape, or a convex shape instead of a groove, any shape may be used as long as the second seal member 72 can be locked.

(Example 2)
FIG. 4 is a diagram for explaining a pressure detecting device according to the second embodiment of the present invention, and is an enlarged view of a distal end portion of the pressure detecting device mounted on a cylinder head. In addition, about the structure similar to the front-end | tip side sealing part of the pressure detection apparatus 5 which concerns on Example 1, the same code | symbol is attached | subjected and the description is abbreviate | omitted. The mounting hole 4a of the cylinder head 4 according to the second embodiment has the same structure as the mounting hole 4a described in the first embodiment.

  With reference to FIG. 4, a configuration relating to the pressure detecting device 5 mounted in the mounting hole 4a of the cylinder head 4 will be described. The pressure detecting device 5 includes a cylindrical housing 30 that houses a piezoelectric element therein. The housing 30 includes a first housing 31 provided on a front end side and a second housing 32 provided on a rear end side.

  A diaphragm head 40 for receiving the pressure of the combustion chamber C is provided on a front end surface of the first housing 31.

  Further, the first housing 31 includes a front side surface 31b and a rear end side surface 315 having an outer diameter larger than the front side surface 31b, and a connecting portion between the front side surface 31b and the rear side surface 315 includes a front side. Has a slope 315a as an example of a tapered shoulder portion whose outer diameter gradually increases toward the rear end side.

  Further, on the inclined surface 315a side of the front end side surface 31b, a step portion 31bt formed of a groove formed over the entire area in the circumferential direction is formed. The second seal member 72 is fitted into the step portion 31bt. The step portion 31bt functions as a first locking portion for locking the second seal member 72 to the first housing.

  Further, on the side surface of the first housing 31 and on the tip side of the step portion 31bt, two step portions 31ct and 31dt formed of grooves formed over the entire area in the circumferential direction are formed. The step portions 31ct and 31dt function as second locking portions that lock and take out the second seal member 72 that has come off from the step portion 31bt when the pressure detecting device 5 is removed from the mounting hole 4a, for example.

  By providing the second locking portion on the distal end side, it is possible to lock the detached second seal member 72 at the same time as removing the pressure detection device 5. Further, by providing the two step portions 31ct and 31dt, even if the second seal member 72 cannot be locked at one step portion, the second seal member 72 can be locked at the other step portion, and the second seal member 72 can be more reliably locked. The two seal members 72 can be taken out. Here, in the present embodiment, the example in which the number of the second locking portions is two has been described. However, the number of the second locking portions is not limited thereto, and the number of the second locking portions may be three or more.

  Next, the specific shapes of the step portion 31bt serving as the first locking portion and the step portions 31ct and 31dt serving as the second locking portion will be described. The step portion 31bt serving as the first locking portion is a groove formed over the entire area of the first housing 31 in the circumferential direction, and has a rectangular cross section. In addition, the step portions 31ct and 31dt, which are the second locking portions, are grooves formed over the entire area of the first housing 31 in the circumferential direction, and their groove cross sections are rectangular. The groove width of the step portions 31ct and 31dt is the same as the groove width of the step portion 31bt. The groove depth of the step portion 31ct is smaller than the groove depth of the step portion 31bt, and the diameter of the first housing 31 on the groove bottom surface is larger than the diameter of the first housing 31 on the groove bottom surface of the step portion 31bt. On the other hand, the groove depth of 31dt is deeper than the groove depth of the step portion 31bt, and the diameter of the first housing 31 at the groove bottom is smaller than the diameter of the first housing 31 at the groove bottom of the step portion 31bt.

  The difference between the groove depths of the step portions 31ct and 31dt serving as the second locking portions is adapted to the state of the second seal member 72 when the groove portions 31dt and 31dt come off from the step portions 31bt serving as the first locking portions. It is. It is presumed that the state of the second seal member 72 is different in the mounting hole 4a depending on the state of use. By setting the second locking portion as two types of step portions 31ct and 31bt, even if the second sealing member 72 cannot be locked at one step portion, it can be locked at the other step portion. Like that. With such a configuration, the second seal member 72 can be more reliably taken out.

(Example 3)
Third Embodiment A third embodiment is a modification of the second locking portion in the first embodiment. FIG. 5 is a diagram for explaining the pressure detecting device according to the third embodiment of the present invention, and is an enlarged view of the tip of the pressure detecting device 5 mounted on the cylinder head 4. In the first embodiment, the step portion 31bt serving as the first locking portion is a groove formed over the entire area in the circumferential direction of the first housing 31, and its groove cross section is rectangular. The step portion 31bt, which is the first locking portion, is connected to the outer surface 315 of the first housing 31 with the groove side surface on the rear end side as an inclined surface 315c. The inclined surface 315c is provided with a rough surface that is rougher than the surface roughness of the groove bottom surface of the first locking portion over the entire area in the circumferential direction, and is continuous with the step portion 31bt that is the first locking portion. The provided inclined surface 315c is a second locking portion in the present embodiment. Since the second locking portion in the present embodiment is the inclined surface 315c whose outer diameter gradually increases from the groove bottom surface of the first locking portion, the radial restraining force acting on the second seal member 72 is less than the second locking portion. It is larger than one locking part. Further, the inclined surface 315c, which is the second locking portion, is a rough surface and therefore has higher frictional resistance than the first locking portion. Therefore, the second locking portion has a configuration in which the locking force on the second seal member 72 is greater than that of the first locking portion. Although the cross section of the inclined surface 315c in this embodiment has been described as a straight line, the present invention is not limited to this shape. For example, even if the cross section is a convex curve shape, a concave curve shape, a wavy uneven shape, or the like, any shape may be used as long as the second seal member 72 can be locked.

(Example 4)
Fourth Embodiment A fourth embodiment is a modification of the second locking portion in the second embodiment having a second locking portion provided on the distal end side of the first locking portion. FIG. 6 is a diagram for explaining the pressure detection device 5 according to the fourth embodiment of the present invention, and is an enlarged view of the tip of the pressure detection device 5 mounted on the cylinder head. In the second embodiment, the step portions 31ct and 31dt, which are the second locking portions, are grooves formed over the entire area in the circumferential direction, and their groove cross sections are rectangular. On the other hand, the second locking portion in the present embodiment is a step portion 31et which is a plurality of protrusions intermittently arranged in the circumferential direction. The cross section of the step portion 31et is rectangular. The second locking portion in the present embodiment is the stepped portion 31et whose outer diameter is larger than the groove bottom surface of the stepped portion 31bt which is the first locking portion, so that the second seal detached from the first locking portion. The member 72 can be effectively locked.

  Next, a method for removing the functional component of the present invention will be described in detail by taking the removal of the pressure detecting devices of the first and fourth embodiments as an example.

  First, a method of removing the pressure detecting device 5 when the second locking portion is provided on the rear end side using the pressure detecting device 5 of the first embodiment will be described. FIG. 7 is a diagram for explaining a method of removing the pressure detecting device 5 when the second locking portion is provided on the rear end side. The pressure detecting device 5 is removed in the next Step.

[Step0]
This is a state in which the pressure detecting device 5 is mounted in the mounting hole 4a of the cylinder head 4. The second seal member 72 is fitted into the step portion 31bt serving as the first locking portion.
[Step1]
The pressure detector 5 is pulled out to the rear end side. At this time, the second seal member 72 may come off from the step portion 31bt serving as the first locking portion, and may be left in the mounting hole 4a.
[Step2]
The pressure detecting device 5 is pushed into the mounting hole 4a, and the second seal member 72 is locked to the step portion 315at which is the second locking portion. If the locking force of the second locking portion is made larger than that of the first locking portion, the second seal member 72 can be locked to the second locking portion effectively.
[Step3]
Pull out the pressure detecting device 5 to the rear end side and remove it. At this time, the second seal member 72 is locked by the step portion 315at as the second locking portion and is taken out. If the locking force of the second locking portion is made larger than that of the first locking portion, the second seal member 72 can be reliably taken out without being left in the mounting hole. Even if the second seal member 72 cannot be removed at one time, the second seal member 72 can be taken out by repeating Step 1 to Step 3.

  Next, a method of removing the pressure detecting device 5 when the second locking portion is provided on the distal end side using the pressure detecting device 5 of the fourth embodiment will be described. FIG. 8 is a diagram for explaining a method of removing the pressure detection device 5 when the second locking portion is provided on the distal end side. The pressure detecting device 5 is removed in the next Step.

[Step0]
This is a state in which the pressure detecting device 5 is mounted in the mounting hole 4a of the cylinder head 4. The second seal member 72 is fitted into the step portion 31bt serving as the first locking portion.
[Step1]
The pressure detector 5 is pulled out to the rear end side. At this time, the second seal member 72 may come off from the step portion 31bt serving as the first locking portion.
[Step2]
The pressure detecting device 5 is continuously pulled out from Step 1, and the second seal member 72 is locked to the step portion 31et which is the second locking portion. If the locking force of the second locking portion is made larger than that of the first locking portion, the second seal member 72 can be locked to the second locking portion effectively.
[Step3]
The pressure detecting device 5 is completely pulled out from the mounting hole 4a on the rear end side and removed. At this time, the second seal member 72 is locked by the step 31et as the second locking portion and is taken out.

  By removing the pressure detecting device 5 by either of the above two steps, the second seal member 72 can be easily taken out without using a special tool or jig. As a result, it is possible to prevent the inner surface of the mounting hole, in particular, the seal surface with which the second seal member 72 is in contact from being damaged.

  Although the functional component and the method of removing the functional component of the present invention have been described based on the embodiment, the present invention is not limited to this embodiment. For example, the second seal member 72 in the embodiment has been described in the form of a substantially C-shaped ring having a cross section with an opening on the inside, but the present invention is not limited to this shape. Can be appropriately selected. Also, the material of the second seal member 72 may be any material that can be locked by the locking portion, and examples thereof include PTFE resin and metal.

  Further, as for the configuration and removal method of the functional components described in the embodiments, the respective embodiments may be combined, or some of the configurations may be removed or changed. For example, a second locking portion may be provided on both sides of the first locking portion of the functional component on the front end side and the rear end side, and the second locking portion is formed as an intermittent rough surface in the circumferential direction of the functional component. It is also possible. According to the functional component and the method of removing the functional component of the present invention, the second locking portion for locking the seal member is provided on the outer surface of the housing of the functional component, separately from the first locking portion. Any structure and removal method may be used as long as the seal member detached from the locking portion can be locked by the second locking portion.

DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 Cylinder block 2a Cylinder 3 Piston 4 Cylinder head 4a Mounting hole 4b 1st hole 4c Inclined part 4d 2nd hole 4e Female screw 4f End face 5 Pressure detector 10 Piezoelectric element 22 Conductive member 23 Covering member 30 Housing 31st 1 housing 31b front end side surface 31bt stepped portion 31ct stepped portion 31dt stepped portion 31et stepped portion 315at stepped portion 315 rear end side surface 315a inclined surface 32 second housing 330 outer peripheral surface 331 first outer peripheral surface 332 second outer peripheral surface 332a male screw 333 first 3 outer peripheral surface 334 fourth outer peripheral surface 334a end surface 40 diaphragm head 50 first electrode portion 55 second electrode portion 60 insulating ring 65 support member 71 first seal member 72 second seal member

Claims (7)

A functional component attached to a mounting hole communicating with a combustion chamber of an internal combustion engine,
The functional component includes a housing that can be inserted into the mounting hole, and a first locking portion for locking a sealing member that seals between the mounting hole and the outer surface of the housing, on the outer surface of the housing.
When the functional component is mounted on the internal combustion engine, the combustion chamber side of the functional component is located on a front end side, and the opposite side of the distal end side is located on a rear end side. A second locking portion separate from the first locking portion for locking the seal member on at least one of a front end side and a rear end side of the locking portion; The functional component according to claim 1, wherein the second locking portion comprises a groove . The second locking portion has a greater locking force of the seal member than the first locking portion;
The functional component according to claim 1, wherein: The second locking portion before SL is provided on the tip side of the first locking portion,
Functional components according to claim 1 or 2, characterized in that. The second locking portion is provided at a rear end side of the first locking portion.
Functional components according to claim 1 or 2, characterized in that. A plurality of the second locking portions are provided,
Functional components according to claim 1, any one of 4, characterized in that. The second locking portion is provided on a front end side and a rear end side with the first locking portion interposed therebetween.
The functional component according to claim 5 , wherein: A method for removing a functional component attached to an attachment hole communicating with a combustion chamber of an internal combustion engine,
The functional component locks a housing that can be inserted into the mounting hole, a first locking portion for locking a seal member that seals between the mounting hole and an outer surface of the housing, and the seal member. A second locking portion different from the first locking portion is provided on an outer surface of the housing;
When the functional component is attached to the internal combustion engine, when the combustion chamber side of the functional component is a front end side and a direction opposite to the front end side is a rear end side, the second locking portion is the first locking portion. Part is provided on the rear end side,
The functional component is pushed into the front end side to lock the seal member to the second locking portion, and then the functional component is pulled out to the rear end side to be removed from the mounting hole. How to remove functional components.

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