JP4880562B2 - Engine pressure sensor - Google Patents

Description

  The present invention relates to an engine pressure sensor that detects a pressure in a cylinder of an engine.

  A sensor part that is installed at the bottom of a vertical hole-shaped plug hole formed in the cylinder head and inserts the mounting screw part of the engine plug into the center through-hole, and the conductivity that rises from the sensor part toward the opening part of the plug hole For example, Patent Document 1 discloses an engine pressure sensor having a sexual pipe portion and an output line connected to the sensor portion.

The pipe part of the engine pressure sensor has a double structure in which the outer side of the inner pipe is surrounded by an outer pipe. The output line is inserted into the gap between the inner pipe and the outer pipe, and a filler is inserted into the gap. Filled. In addition, an output line is drawn out from the gap between the inner pipe and the outer pipe, and a connector is attached to the end.
Japanese Patent No. 3226374

  In the above conventional engine pressure sensor, since a connector is attached to the tip of the output line drawn to the outside, the fixing means for fixing the output line is plugged so that the output line does not fluctuate due to vibration after assembly of the vehicle There is a problem that it is necessary to provide it separately in the vicinity of the hall, and there is always a concern that the output line drawn to the outside may be broken.

  The present invention has been made in view of the above problems, and an object thereof is to provide an engine pressure sensor that does not expose an output line to the outside.

As described in claim 1, an annular sensor portion that is installed at the bottom of the plug hole and that inserts the mounting screw portion of the engine plug into the central through hole;
A pipe portion extending from the sensor portion toward the opening of the plug hole in a state of being installed in the plug hole;
A flange-shaped noise shielding plate provided on the top of the pipe portion;
An output line connected to the sensor unit;
A terminal fitting which is connected to the output line and whose end is a pin-shaped portion;
The terminal metal fitting is arranged on the sensor part side of the noise shielding plate, and a resin-made annular cap portion is formed by insert molding in a state of including a part of the terminal metal fitting and the noise shielding plate. A cylindrical connector portion surrounding the pin-shaped portion of the terminal fitting is formed integrally with the annular cap portion ,
The annular cap portion includes a portion surrounding the noise shielding plate as an annular main portion, the annular main portion including a part of the terminal fitting, and the noise shielding plate further including a height of the annular main portion of the annular cap portion. The curved portion is formed in a portion corresponding to the terminal fitting of the noise shielding plate, and the interval between the curved portion and the terminal fitting, and the sensor portion of the bending portion are An engine pressure sensor is provided in which the resin thickness of the annular main portion on the sensor portion side with respect to the opposite side and the terminal fitting is set substantially the same .

In addition, as described in claim 2 , with respect to a portion protruding from the periphery of the pipe portion of the noise shielding plate, the sensor portion of the terminal fitting and the sensor portion in the terminal fitting with reference to a circle centering on the central axis of the pipe portion The engine pressure sensor according to claim 1, wherein a part of the region other than the region covering the opposite side is removed.

Further, as described in claim 3 , in the engine pressure sensor according to claim 2 , the region of the noise shielding plate that covers the side opposite to the sensor portion of the terminal fitting is an area of the circle. Both ends of a fan-shaped arc whose central angle is an angle of ± 45 ° when the radius toward the pin-shaped portion of the terminal fitting is taken as a reference with respect to the entire circumference of 360 °, and is parallel to the radius and the sector An engine pressure sensor having a range surrounded by a straight line passing through both ends of the arc is provided.

In addition, as described in claim 4 , in the engine pressure sensor according to claim 2 or 3 , the noise shielding plate is a region other than a region covering the side opposite to the sensor portion of the terminal fitting. Provided is a pressure sensor for an engine in which a part is removed by drilling a through hole in a region.

Moreover, as described in claim 5 , the gate position at the time of insert molding of the annular cap portion is set in the annular main body portion on the opposite side of the terminal fitting, according to any one of claims 1 to 4 . An engine pressure sensor is provided.

In the engine pressure sensor according to the present invention, since the annular cap portion is formed on the top of the pipe portion and the connector portion is provided on the annular cap portion, it is necessary to separately provide a fixing means for fixing the output line and the connector near the plug hole. Absent. Further, since the output line and the connector do not hang, the engine pressure sensor can be attached and detached efficiently. Furthermore, since the output line is not drawn to the outside, the risk of disconnection is drastically reduced.
On the other hand, by providing the connector part in the annular cap part, it is easy to be affected by electromagnetic noise having an ignition coil or the like as a noise source. However, the engine pressure sensor of the present invention is located above the terminal fitting (what is the sensor part? Since the noise shielding plate is arranged on the opposite side), it is not easily affected by electromagnetic noise.

In the engine pressure sensor of the present invention, a portion surrounding the noise shielding plate of the annular cap portion is used as an annular main portion so that the annular main portion also includes a part of the terminal fitting, and further the noise shielding plate and the terminal fitting. An interval in the vertical direction is provided in between, and the resin thickness of the annular main portion above the noise shielding plate and below the terminal fitting is set to be substantially the same as the interval, so that the resin flow during insert molding is annular Dispersed almost evenly on the top, middle and bottom of the part, it is difficult for partial resin stagnation and pressure imbalance to occur, and as a result, deformation of the noise shielding plate can be prevented, and molding stability Increase.

In the engine pressure sensor according to the present invention , the noise shielding plate is disposed at a substantially middle position of the annular main portion of the annular cap, and a curved portion is provided at a portion corresponding to the terminal fitting of the noise shielding plate. The distance between the curved portion and the terminal fitting, and the resin thickness of the annular main body above the curved portion (opposite to the sensor portion) and below the terminal fitting (sensor portion side) are set to be substantially the same. Further, the balance of the resin thickness for the entire annular main body is improved, and the fluidity of the resin during insert molding is further improved.

Further, in the engine pressure sensor according to claim 2 , the portion of the noise shielding plate that protrudes from the periphery of the pipe portion is positioned above the terminal fitting with respect to a circle centered on the central axis of the pipe portion (sensor Since part of the area other than the area that covers the opposite side) is removed, it is possible to reduce the weight while maintaining good noise shielding performance of the noise shielding plate. The fluidity of the resin can also be improved.

The engine pressure sensor according to claim 3, ± 45 ° at a time when one entire circumference 360 ° of the circle of claim 2 relative to the radius towards the distal end side of the terminal fitting (pin-shaped portion) A range surrounded by both ends of a fan-shaped arc centered at an angle and a straight line that is parallel to the radius and passes through both ends of the fan-shaped arc is above the terminal fitting of the noise shielding plate (opposite to the sensor unit). Side), a stable noise shielding effect can be obtained with a lean noise shielding plate.

According to a fourth aspect of the present invention, there is provided an engine pressure sensor having a through hole formed in a region other than a region covering the top of the terminal fitting (opposite to the sensor portion) with respect to the noise shielding plate. Since it was removed, the same effect as the engine pressure sensor of claim 2 can be obtained.

Further, in the engine pressure sensor according to claim 5 , the gate position at the time of insert molding of the annular cap portion is set to the annular main portion on the opposite side of the terminal fitting, so that the resin is first applied from the complicated connector portion. Therefore, the molding stability is improved as a whole.

  Embodiments of the present invention will be described below with reference to the drawings. 1 is a longitudinal sectional view of the engine pressure sensor, FIG. 2 is a longitudinal sectional view showing an enlarged state with the middle of the engine pressure sensor omitted, and FIG. 3 is a sectional view taken along line XX in FIG. 4 is a top perspective view of the pressure sensor for an engine showing a state in which the annular cap portion is divided at the center, FIG. 5A is a plan view of the noise shielding plate, FIG. 5B is a side view of the noise shielding plate, and FIG. (C) is a central longitudinal sectional view of the noise shielding plate, FIG. 6 is a plan view of the noise shielding plate showing another embodiment, and FIG. 7 is a sectional view of the main part of the engine showing the use state.

  An engine pressure sensor (hereinafter simply referred to as “pressure sensor”) 1 according to the present invention includes a sensor unit 2 located at the bottom of FIG. 1, an output line 3 connected to the sensor unit 2, and the sensor unit. A vertical hole-shaped plug formed in the cylinder head 6 of the engine as shown in FIG. 7, schematically comprising a pipe portion 4 raised from 2 and an annular cap portion 5 provided on the top of the pipe portion 4. Installed in Hall 7.

[Sensor part]
As shown in FIG. 2, the sensor unit 2 is a cup-shaped unit having a through hole 2 a at the center, and a metal inner cup 2 b located inside, and a metal outer cup 2 c located outside. The pressure detecting member 2d is a space between the outer cup 2c and the inner cup 2b and disposed around the through hole 2a.

  The space between the inner cup 2b and the outer cup 2c of the sensor unit 2 is filled with a filler 8 such as rubber without a gap, and the filler 8 is solidified in a state where the pressure detecting member 2d is sealed.

  On the other hand, the pressure detection member 2d is an integrated body such as a piezoelectric element, and electrically detects a change in pressure in the cylinder 9. Such a pressure detection member 2d is a known member that is also used in Patent Document 1, and thus detailed description thereof is omitted.

  A core wire 3a (described later) of the output line 3 is connected to the pressure detection member 2d of the sensor unit 2, and the output line 3 is also embedded in the filler 8. In the following description, the lead-out side (left side in FIG. 1) of the output line 3 is defined as the front side of the pressure sensor 1, and the opposite side (right side in FIG. 1) is defined as the rear side.

[Output line]
The output line 3 is a so-called lead wire, and the core wire 3a which is a conductor is covered with a covering cover 3b which is an insulator. One end (lower end) of the output line 3 is connected to the pressure detection member 2d of the sensor unit 2 as described above, and the other end (upper end) is omitted in side view as shown in FIGS. It is connected to the terminal metal fitting 10 which is an inverted L-shape and has a tip-shaped portion 10a.

[Pipe part]
The pipe part 4 is obtained by drawing a conductive metal tube, and as shown in FIGS. 1 and 2, the pipe part 4 has an outward flange part 4a at the top, and is a position slightly lowered from the flange part 4a. A stepped pipe is provided with a reduced diameter step portion 4b, and the lower end thereof is externally fitted to the inner cup 2b of the sensor portion 2 and welded.

[Pipe-Noise shielding plate]
On the upper surface of the flange portion 4a of the pipe portion 4, a noise shielding plate 4c made of a conductive metal plate is welded. The noise shielding plate 4c is formed in a disc shape along a circle C having the center axis O of the pipe portion 4 as the center O as shown by an imaginary line in FIG. The noise shielding plate 4c according to the embodiment has a substantially oval shape in which two substantially semicircles HCf and HCr are connected by straight lines L and L, and the rear side of the substantially oval shape. A circular hole 4e corresponding to the flange portion 4a is formed concentrically with the semicircle HCr, and the circumference of the circular hole 4e is welded to the upper surface of the flange portion 4a of the pipe portion 4. On the other hand, the semicircle HCf of the front portion 4d of the noise shielding plate 4c in the embodiment is an approximate semicircle, and as shown in FIG. Both ends of a circular arc A having a center angle of ± α with respect to the radius R toward the front end side of the metal fitting 10 are chamfered in an arc shape and connected to the straight lines L and L.

  As a result of repeated trials and trials, it was confirmed that when α exceeds 45 °, the noise shielding effect becomes almost constant, and as it becomes smaller, the noise shielding effect decreases. Therefore, if the α of the noise shielding plate 4c is set to 45 ° or more, a stable noise shielding effect can be obtained. Of course, depending on the use environment, there is of course a case where the noise shielding plate 4c having α of less than 45 ° can be used.

As described above, the noise shielding plate 4c of the embodiment is obtained by removing a part of the region other than the region covering the top of the terminal fitting 10 on the basis of the circle C having the center axis O of the pipe portion 4 as the center O. In other words, the region covering the top of the terminal fitting 10 and the region for joining the pipe portion 4 (around the circular hole 4e) are removed, and the good noise shielding performance is maintained while doing so. The weight can be reduced, and the fluidity of the resin at the time of insert molding is improved, so that the yield is improved.
Further, as shown in FIG. 6, the noise shielding plate 4c is formed in the shape of an imaginary line in FIG. 5A, and the holes 4f, 4f,. The same effect as described above can be obtained also when a means for removing a part by drilling is provided.

[Pipe part-Output line cover]
An output line cover 11 for passing the output line 3 is attached in front of the pipe outer peripheral surface 4g of the pipe portion 4. This output line cover 11 includes a cover main body 11a in the form of a half pipe (in which the pipe is divided into two in the axial direction), and strip-shaped attachment pieces 11b and 11b that project from both sides of the cover main body 11a. It is made to contact the front surface of the pipe outer peripheral surface 4g of the pipe portion 4 with the concave surface 11c of the cover main body 11a facing, and the attachment pieces 11b and 11b are fixed to the pipe outer peripheral surface 4g of the pipe portion 4 by spot welding. Do it. The welding spots Wa to We of the mounting pieces 11b and 11b are, as shown by arrows in FIG. 1, the upper and lower ends, the central portion, and a total of five points between them, and the space between the welding spots Wa to We is between them. It is a non-fixed part. The non-fixed portion is merely not fixed, and is in close contact with the pipe outer peripheral surface 4g with almost no gap.

  Between the concave surface 11 c of the output line cover 11 and the pipe outer peripheral surface 4 g of the pipe portion 4, a wiring space S having a bowl shape as shown in FIG. 3 is formed. The output line 3 is passed, and the output line 3 is firmly fixed by a filler 8 such as rubber filled in the wiring space S.

  The wiring space S is filled with the filler 8 from the filling port 11 d opened in the cover main body 11 a of the output line cover 11. In FIG. 1, two filling ports 11d are provided on the line connecting the welding spots Wb, Wb of the attachment pieces 11b, 11b on both sides and on the line connecting the welding spots Wd, Wd. Even if the pressure at the time of filling the filler 8 into the opening 11d is high, there is no possibility that the filler 8 leaks from the edges of the mounting pieces 11b and 11b. On the other hand, for filling the filler 8, it is indispensable to discharge the air in the wiring space S. As described above, the mounting pieces 11b and 11b of the output line cover 11 have a space between the welding spots Wa to We. Since it is left as a non-fixed part, air can be vented from there.

[Annular cap part]
The annular cap portion 5 is a synthetic resin molded product provided on the top of the pipe portion 4, and the terminal fitting 10 is disposed below the noise shielding plate 4 c, and the pin-shaped portion 10 a of the terminal fitting 10 is provided. And an intermediate portion other than the lower end portion and the noise shielding plate 4c are formed by insert molding. In the embodiment, the lower end portion of the terminal fitting 10 is covered with the same rubber 12 as the filler 8.

  As shown in FIG. 2, the annular cap portion 5 includes a neck portion 5a that covers the diameter-reduced step portion 4b of the pipe portion 4 from the bottom, an annular main portion 5b that surrounds the noise shielding plate 4c, and the annular main portion. A cylindrical base portion 5c protruding from the upper surface of the portion 5b and having the same central axis as the central axis of the pipe portion 4, and a pin shape of the terminal fitting 10 protruding forward from the peripheral side surface of the annular main portion 5b. And a cylindrical connector portion 5d surrounding the portion 10a.

  The noise shielding plate 4c is at a substantially intermediate position in height (thickness) with respect to the annular main body 5b. On the other hand, since the terminal fitting 10 is disposed under the front portion 4d of the noise shielding plate 4c, if the noise shielding plate 4c is flat, the terminal fitting 10 is provided in the lower half of the annular main body 5b. The upper half of the main body 5b has a thick resin layer. In such a state, when molten resin is injected and insert molding is performed, there is a possibility that the flow of the resin may stagnate in the lower half of the annular main body portion 5b, or pressure may not be applied evenly. There is a possibility that the front portion 4d of the shielding plate 4c is deformed.

  On the other hand, in the embodiment, as shown in FIG. 4, a curved portion 4 h that rises upward is formed in the center of the front portion 4 d of the noise shielding plate 4 c, and the distance between the curved portion 4 h and the terminal fitting 10 is The resin thickness of the annular main portion 5b above the curved portion 4h and below the terminal fitting 10 is set to be substantially the same (see FIG. 2). By doing so, the flow of the resin at the time of insert molding in front of the annular main body 5b is distributed almost evenly above the bending portion 4h, between the bending portion 4h and the terminal fitting 10, and below the terminal fitting 10. Partial resin stagnation and pressure imbalance are unlikely to occur, and as a result, deformation of the noise shielding plate 4c can be prevented and molding stability is increased.

  The gate position at the time of insert molding of the annular cap portion 5 is set after the annular main portion 5b on the opposite side of the terminal fitting 10, that is, the annular main portion 5b, and molten resin is injected from the gate. The gate is provided at the center of the annular main body 5b and set so that the molten resin is injected toward the noise shielding plate 4c, or two gates are provided above and below the noise shielding plate 4c. It is good to make it.

[Others]
In the figure, reference numeral 13 denotes an elastic seal ring fitted to the neck portion 5 a of the annular cap portion 5 and prevents water from entering the plug hole 7. Reference numeral 5e denotes an anchor projection protruding from the outer surface of the connector portion 5d of the annular cap portion 5 and engages with a hook portion 14a of another connector 14 inserted into the connector portion 5d to prevent the connector 14 from coming off. . Reference numeral 4 i denotes an air vent hole provided on the rear surface of the pipe portion 4.

[How to install pressure sensor]
First, as shown in FIG. 7, the pressure sensor 1 of the present invention is inserted into the plug hole 7 and the sensor unit 2 is placed on the bottom of the plug hole 7. In this state, the mounting screw portion 15a of the spark plug 15 that is an engine plug is inserted into the through hole 2a of the sensor portion 2, and the mounting screw portion 15a of the spark plug 15 is screwed into the female screw 6a of the cylinder head 6 and tightened. The sensor part 2 is fastened to the bottom of the plug hole 7 in a washer state with force. In this state, the elastic seal ring 13 of the annular cap portion 5 is fitted into the opening of the plug hole 7, and the elastic seal ring 13 is pressed against the upper surface of the cylinder head 6 to prevent water from entering the plug hole 7.

  Next, the ignition coil 16 is installed on the cylindrical base part 5 c of the annular cap part 5. A plug cap 16 a is integrally suspended from the lower surface of the ignition coil 16, and the plug cap 16 a passes through the pipe portion 4 of the pressure sensor 1 and fits on the top of the ignition plug 15. Thereby, the ignition coil 16 and the spark plug 15 are electrically connected through the plug cap 16a.

  On the other hand, a connector 14 connected to a control device (not shown) is inserted into the connector portion 5d of the annular cap portion 5. Thereby, a control apparatus and the sensor part 2 are electrically connected.

  When the engine is operated in the above state, the change in the internal pressure in the cylinder 9 is detected by the sensor unit 2 of the pressure sensor 1, and the signal is transmitted to the control device, so that the combustion in the cylinder 9 is optimal. It is controlled to become.

  On the other hand, while the engine is operating, the engine vibrates and electromagnetic noise is generated from the ignition coil 16. In general, when the output line 3 of the pressure sensor 1 vibrates with the vibration of the engine, vibration noise is generated and superimposed on the sensor output, which may adversely affect the combustion control. Further, the electromagnetic noise of the ignition coil 16 is superimposed on the sensor output through the terminal fitting 10 provided in the annular cap portion 5, which may also adversely affect the combustion control.

On the other hand, the pressure sensor 1 according to the present invention is fixed to the wiring space S formed between the pipe outer peripheral surface 4g of the pipe portion 4 and the concave surface 11c of the output line cover 11 with the filler 8 through the output line 3, so that the engine Vibration noise associated with the vibrations of the
Further, in the pressure sensor 1 of the present invention, since the noise shielding plate 4c is disposed above the terminal fitting 10, electromagnetic noise is transmitted to the terminal fitting 10 even if there is a noise source such as the ignition coil 16 above the annular cap portion 5. Absent.

  The embodiments of the present invention have been described above, but the present invention is of course not limited to the above embodiments. For example, in the embodiment, the noise shielding plate is formed separately from the flange portion 4a and welded. However, the flange portion 4a itself can be enlarged to be a noise shielding plate integrated with the pipe portion 4. .

[Other technical ideas included in the above embodiment]
The above embodiment includes technical ideas such as the following items [A] to [C] for solving the following other problems in the conventional pressure sensor for an engine. ing.
In other words, the conventional engine pressure sensor has a double pipe structure, so that it is difficult to process and it is difficult to cope with an extremely deep plug hole. Moreover, since it is necessary to fill the entire gap between the pipe portions having a double structure, there is a problem that the filling amount of the filler is large, which is uneconomical and heavy.

[A]
An annular sensor part that is installed at the bottom of the plug hole and passes through the mounting screw part of the engine plug through the central through hole;
A pipe portion extending from the sensor portion toward the opening of the plug hole in a state of being installed in the plug hole;
An output line connected to the sensor unit;
An output line cover formed by projecting a strip-shaped attachment piece on both sides of the cover main body, one of which is a concave surface in the form of a half pipe,
The mounting piece of the output line cover is fixed to the outer peripheral surface of the pipe portion to form a wiring space between the outer peripheral surface and the concave surface of the output line cover, and the output line is passed through the wiring space. A pressure sensor for an engine, characterized in that a filling material is filled and solidified in a state so that the output line passed through the wiring space is fixed.

[B]
The mounting piece of the output line cover is fixed to the outer peripheral surface by spot welding, and a space between the welding spots is set as a non-fixed part, and air bleeding when filling the wiring space with the filler is the non-fixed part. The pressure sensor for an engine according to [A], wherein the pressure sensor for an engine is used.

[C]
The filling port for filling the wiring space with a filler is provided on a line connecting the welding spots of the left and right mounting pieces which are the cover main body and sandwich the cover main body. B] The pressure sensor for engines described in [B].

It is a longitudinal cross-sectional view of the pressure sensor for engines. It is a longitudinal cross-sectional view which shows the state which abbreviate | omitted the middle of the pressure sensor for engines, and expanded. It is the XX sectional view taken on the line of FIG. It is a top perspective view of the pressure sensor for engines which shows the state where the annular cap part was divided in the center. (A) is a top view of a noise shielding board, (b) is a side view of a noise shielding board, (c) is a center longitudinal cross-sectional view of a noise shielding board. It is a top view of the noise shielding board which shows another form. It is principal part sectional drawing of the engine which shows a use condition.

DESCRIPTION OF SYMBOLS 1 ... Engine pressure sensor 2 ... Sensor part 2a ... Through-hole 3 ... Output line 4 ... Pipe part 4c ... Noise shielding plate 4f ... Through-hole 4h ... Curved part 5 ... Annular cap part 5b ... Annular main part 5d ... Connector part 7 ... Plug hole 10 ... Terminal fitting 10a ... Pin-shaped part 15 ... Spark plug (engine plug)
15a ... Mounting screw O: Center C ... Circle R ... Radius A ... Arc L ... Straight

Claims (5)

An annular sensor part that is installed at the bottom of the plug hole and passes through the mounting screw part of the engine plug through the central through hole;
A pipe portion extending from the sensor portion toward the opening of the plug hole in a state of being installed in the plug hole;
A flange-shaped noise shielding plate provided on the top of the pipe portion;
An output line connected to the sensor unit;
A terminal fitting which is connected to the output line and whose end is a pin-shaped portion;
The terminal metal fitting is arranged on the sensor part side of the noise shielding plate, and a resin-made annular cap portion is formed by insert molding in a state of including a part of the terminal metal fitting and the noise shielding plate. A cylindrical connector portion surrounding the pin-shaped portion of the terminal fitting is formed integrally with the annular cap portion ,
The annular cap portion includes a portion surrounding the noise shielding plate as an annular main portion, the annular main portion including a part of the terminal fitting, and the noise shielding plate further including a height of the annular main portion of the annular cap portion. The curved portion is formed in a portion corresponding to the terminal fitting of the noise shielding plate, and the interval between the curved portion and the terminal fitting, and the sensor portion of the bending portion are An engine pressure sensor characterized in that the resin thickness of the annular main portion on the sensor portion side with respect to the opposite side and the terminal fitting is set to be substantially the same . With respect to the portion of the noise shielding plate that protrudes from the periphery of the pipe portion, the region other than the region that covers the opposite side of the terminal fitting from the sensor portion with reference to a circle centered on the central axis of the pipe portion. The engine pressure sensor according to claim 1, wherein a part of the pressure sensor is removed. 3. The engine pressure sensor according to claim 2 , wherein an area of the noise shielding plate that covers a side opposite to the sensor portion of the terminal metal fitting is an angle of 360 degrees with respect to the entire circumference of the circle. Surrounded by both ends of a fan-shaped arc whose center angle is ± 45 ° with respect to the radius toward the pin-shaped portion side, and a straight line that is parallel to the radius and passes through both ends of the fan-shaped arc. An engine pressure sensor characterized by being in a range. An engine pressure sensor according to claim 2 or 3, wherein the noise shielding plate one by the said sensor portion in the terminal fitting is bored a hole in a region other than the region covering the opposite side Engine pressure sensor, characterized in that the part is removed. The engine pressure sensor according to any one of claims 1 to 4 , wherein a gate position at the time of insert molding of the annular cap portion is set to the annular main portion on the opposite side of the terminal fitting.

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