JP2006342758A - Sensor unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To relieve excessive pressure in a sensor unit provided with a pressure sensor. <P>SOLUTION: This unit is provided with a case 50 defining a recess part 55 storing a pressure sensor 60 and a pressure introduction passage 56 introducing detected pressure, and a sensor cover 70 connected to the case 50 to cover the recess part 55. An elastically deformable sensor seal ring 20 is interposed between the pressure sensor 60 and an inner wall surface of the recess part 55. An elastically deformable cover seal ring 130 is interposed between the sensor cover 70 and the case 50. The sensor cover 70 is joined to the case 50 by snap fitting, the sensor seal ring 120 and the cover seal ring 130 are compressed. Seal function is surely provided under normal pressure, and on the other hand, the sensor seal ring 120 and the cover seal ring 130 elastically deform and open a passage to release pressure when excessive pressure is applied. Consequently, breakage of the pressure sensor 60 can be prevented. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a sensor unit for detecting the pressure in an intake passage of an engine mounted on a motorcycle, leisure vehicle, automobile, other vehicle, etc., and is integrally incorporated in a throttle device having a valve body that opens and closes the intake passage. Related to the sensor unit.

  A conventional sensor unit applied to an internal combustion engine includes a case for defining a recess for accommodating a pressure sensor and a pressure introduction passage, a sensor cover for covering the pressure sensor accommodated in the recess, and the like. It is known that it is fixed by using a mold resin material, and is formed so as to be completely blocked from the outside (external) by communicating the internal space in which the pressure sensor is accommodated only to the pressure introduction passage (for example, Patent Document 1).

  In this sensor unit, since the sensor cover is fixed to the case so as to completely seal the pressure sensor, the pressure led to the pressure sensor from the pressure introduction passage has risen beyond a predetermined limit value (the excessive pressure is reduced). When applied), there is a possibility that the pressure sensor may be damaged, the case or the sensor cover may be damaged, or the joint between the two may be detached.

Further, in the method of fixing the sensor cover with the mold resin material (or thermosetting adhesive) as described above, a process of pouring and curing the mold resin material or the like is required, which increases the manufacturing cost and decreases the productivity. Problems such as deterioration in yield due to poor sealing performance occur.
JP 2004-28797 A

  The present invention has been made in view of the above circumstances, and its object is to reduce the number of manufacturing steps, facilitate assembly work, reduce capital investment, while simplifying the structure, etc. It is an object of the present invention to provide a sensor unit capable of improving quality and preventing damage to a pressure sensor or the like when an excessive pressure is applied.

The sensor unit of the present invention is a sensor unit including a pressure sensor and a case for accommodating the pressure sensor and defining a pressure introduction passage for guiding the pressure to be detected, and the pressure sensor passes through the pressure introduction passage and reaches a predetermined level or more. When a pressure is applied, a pressure release mechanism is provided that releases a pressure of a predetermined level or higher to the atmosphere.
According to this configuration, when a pressure of a predetermined level or higher is applied to the pressure sensor through the pressure introduction passage in a state where the pressure sensor is housed in the case, the pressure release mechanism is operated, and the pressure ( Overpressure) is released to the atmosphere.
Thereby, breakage of the pressure sensor and breakage of the case or the like can be prevented, and the pressure can be reliably detected while ensuring the intended sensor function.

In the above-described configuration, the case includes a sensor cover that defines a concave portion that accommodates the pressure sensor and is coupled to the case so as to cover the concave portion in a state in which the pressure sensor is accommodated in the concave portion. And the structure currently formed so that it may interpose between either of a sensor cover can be employ | adopted.
According to this configuration, when a pressure higher than a predetermined level is applied to the pressure sensor through the pressure introduction passage in a state where the pressure sensor is accommodated in the recess and covered with the sensor cover, the pressure sensor, the case, and the sensor cover A pressure release mechanism interposed between the two operates to release a pressure (excess pressure) above a predetermined level to the atmosphere. Thereby, breakage of the pressure sensor and breakage of the case or the like can be prevented, and the pressure can be reliably detected while ensuring the intended sensor function. Further, since the pressure release mechanism is interposed between any one of the pressure sensor, the case, and the sensor cover, a special space is not required, and simplification and downsizing of the structure can be achieved.

In the above-described configuration, the pressure release mechanism includes an elastically deformable sensor seal ring that is interposed and sealed between the inner wall surface of the recess and the pressure sensor, and an elastically deformable that is interposed and sealed between the sensor cover and the case. A configuration including a simple cover seal ring can be employed.
According to this configuration, in a state where the pressure sensor is accommodated in the recess and covered with the sensor cover, the pressure introduction passage is sealed by the sensor seal ring with respect to the outside (atmosphere) of the case, and the cover seal ring It is sealed by. In a normal state, the pressure of the fluid (for example, engine intake air) guided by the pressure introduction passage is detected by the pressure sensor.
Here, when an excessive pressure exceeding a predetermined level (exceeding the detection limit) is applied to the pressure sensor through the pressure introduction passage, the excessive pressure causes the sensor seal ring to elastically deform, and the gap between the concave portion and the pressure sensor. Further, the cover seal ring is elastically deformed through the seal groove, passes through the seal groove between the case and the sensor cover, and passes through the recess from the pressure introduction passage. On the other hand, when returning to the normal pressure state, the sensor seal ring and the cover seal ring are elastically restored to perform the original sealing function. Therefore, even if an excessive pressure is applied, the pressure sensor can be prevented from being damaged, the case or the sensor cover can be prevented from being damaged, and the pressure can be reliably detected while ensuring the intended sealing function.

In the above configuration, the sensor cover is formed so as to contact the end face of the pressure sensor and press the sensor seal ring, and the case is formed so as to contact the outer peripheral edge of the sensor cover and press the cover seal ring. The configuration can be adopted.
According to this configuration, when the sensor seal ring and the pressure sensor are arranged in the concave portion, the cover seal ring is arranged, and the sensor cover is attached from above, the sensor seal ring and the cover seal ring (at a predetermined compression allowance). ) The pressure introduction passage is sealed (blocked) from the outside (atmosphere). In this way, the sensor seal ring, pressure sensor, and cover seal ring are arranged and the sensor cover is attached at the end. As a result, the entire assembly and sealing process is completed. Can be done.

In the above configuration, the case may employ a configuration having a latching claw for connecting the sensor cover by snap-fit coupling.
According to this configuration, the sensor cover is easily connected to the case by snap-fit coupling using the latching claw of the case, so that the desired number of parts can be reduced and the structure can be simplified while achieving the desired The sealing performance can be secured and the assembly can be performed more easily.

The said structure WHEREIN: The structure which the latching nail | claw is intermittently arranged and formed so that it may engage with the outer periphery part of a sensor cover discontinuously can be employ | adopted.
According to this configuration, it is possible to obtain the snap-fit coupling by the latching claws and to easily release the excessive pressure from a discontinuous region without the latching claws when an excessive pressure is applied.

In the above configuration, the pressure introduction passage is formed in communication with the bottom surface of the recess, and an annular seal groove for arranging the sensor seal ring is formed around the pressure introduction passage, and the cover seal is formed on the opening end surface of the recess. A configuration in which an annular seal groove for disposing the ring is formed can be employed.
According to this configuration, the sensor seal ring is disposed in the seal groove provided in the bottom of the recess, and the cover seal ring is disposed in the seal groove formed in the opening end surface of the recess, so that an excessive pressure is applied. The sensor seal ring and the cover seal ring are compressed by elastic deformation in the seal groove without causing a positional shift to open a passage for releasing pressure, and when the pressure returns to normal pressure, Therefore, the sealing function and the pressure relief function can be reliably obtained.

In the above configuration, the sensor cover may have a reinforcing rib on the surface opposite to the region pressing the cover seal ring.
According to this configuration, since the reinforcing rib increases the rigidity of the sensor cover and prevents deformation such as warpage and bending, the cover seal ring can be reliably compressed to obtain a more reliable sealing function.

  According to the sensor unit having the above configuration, an excessive pressure exceeding a predetermined level is applied while achieving a simplified structure, a reduction in manufacturing man-hours, an ease of assembly work, a reduction in capital investment, an improvement in quality, and the like. Therefore, the pressure sensor can be reliably prevented from being damaged and the desired pressure can be detected reliably.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the accompanying drawings.
1 to 6 show a throttle device provided with an embodiment of a sensor unit according to the present invention. FIG. 1 is an external plan view of the throttle device, and FIG. 2 is a joint surface of the sensor unit according to the present invention. FIG. 3 and FIG. 4 are sectional views of the throttle device, FIG. 5 is a partial enlarged view showing the assembly relationship between the case and the sensor cover, and FIG. 6 is a partial sectional view showing the sealed state and the pressure relief state. FIG. Here, an electronically controlled throttle device applied to a small displacement engine mounted on a motorcycle is shown.

  As shown in FIGS. 1 to 4, the throttle device includes a throttle body 10 that forms an intake passage 10a, a butterfly valve body 20 that opens and closes the intake passage 10a, a throttle shaft 30 that holds the valve body 20, and a throttle body. 10 is formed by a sensor unit 40 or the like that is joined to 10 and fixed by screws S or the like. The throttle shaft 30 is rotationally driven by a motor (not shown) fixed to the throttle body 10.

  The throttle body 10 is made of an aluminum material or a resin material. As shown in FIGS. 1 and 3, the throttle body 10 is formed at a cylindrical portion 11 that forms an intake passage 10a extending in a straight line L direction, and at both ends of the cylindrical portion 11. The upstream connecting portion 12 and the downstream connecting portion 13 that are connected to the intake pipe of the engine, the bearing hole 14 that rotatably supports the throttle shaft 30, the flange portion 15 that joins the sensor unit 40, and the flange from the intake passage 10a. A sampling passage 16 that opens to the joint surface of the portion 15 to extract intake pressure, an insertion hole 17 that is formed to open from the intake passage 10a to the joint surface of the flange portion 15 and inserts a temperature sensor 80 described later, A recess 18 or the like for accommodating a movable portion 92 of an opening degree sensor 90 described later is provided.

  As shown in FIGS. 1 to 4, the sensor unit 40 includes a case 50 formed so as to define an outer contour by a resin material, a pressure sensor 60 held by the case 50, a sensor cover 70 covering the pressure sensor 60, A temperature sensor 80, an opening degree sensor 90 (a sensor unit 91 thereof), an electrical connection terminal 100, and the like are provided.

  As shown in FIGS. 2 to 4, the case 50 embeds a joint surface 51 with the throttle body 10, an annular seal groove 52 formed on the joint surface 51, and a sensor portion 91 of the opening sensor 90 and a movable portion. An annular recess 53 for receiving 92, a pipe portion 54 in which a temperature sensor 80 is embedded and extended, a recess 55 for accommodating the pressure sensor 60, a pressure introduction passage 56 communicating with the bottom surface of the recess 55 and simultaneously communicating with the sampling passage 16, a recess An annular seal groove 55a formed around the pressure introduction passage 56 on the bottom surface of 55, an annular seal groove 57a formed on the opening end surface 57 of the recess 55, and a plurality of hooks formed protruding around the seal groove 57a A pawl 58, a connector part 59 surrounding the terminal 100, and the like are provided.

As shown in FIG. 1, the plurality of latching claws 58 are formed so as to be intermittently arranged so as to discontinuously engage with an outer peripheral edge portion 71 described later of the sensor cover 70.
And the latching claw 58 has the front-end | tip part 58a formed in an acute angle as shown in FIG. 5 (a), (b), and the front-end | tip part 58a has the substantially same inclination | tilt angle. The sensor cover 70 is snap-fit coupled to the case 50 by being hooked to the portion 71.
Further, as shown in FIG. 5C, a gap C is formed between the latching claw 58 and the latching claw 58 in a state where the sensor cover 70 is connected to the case 50. .
Thus, by providing the case 50 with the latching claw 58 for connecting the sensor cover 70 by snap-fit coupling, the sensor cover 70 can be easily connected to the case 50, so that the number of parts can be reduced. Simplification of structure can be achieved.

  In the case 50, as shown in FIGS. 3 and 4, the elastically deformable annular seal ring 110 is fitted in the seal groove 52 of the joint surface 51, and the pressure release mechanism is inserted in the seal groove 55 a of the recess 55. An elastically deformable annular sensor seal ring 120 is fitted, and an elastically deformable annular cover seal ring 130 as a pressure release mechanism is fitted in the seal groove 57a of the opening end face 57.

  The seal ring 110 is a substantially circular or substantially elliptical O-ring formed of a rubber material. The seal ring 110 is interposed between the flange portion 15 (joint surface) of the throttle body 10 and the joint surface 51 of the case 50, and between the sampling passage 16 and the insertion hole 17 and the outside (atmosphere). Seal.

  The sensor seal ring 120 is a substantially elliptical O-ring formed of a rubber material. The sensor seal ring 120 is interposed between the pressure sensor 60 (a projecting portion 62 described later) and the inner wall surface of the recess 55 (the wall surface of the seal groove 55a). Seal the gap.

  The cover seal ring 130 is a substantially elliptical O-ring formed of a rubber material. The cover seal ring 130 is interposed between the sensor cover 70 and the case 50 (open end surface 57), and seals between the recess 55 and the outside (atmosphere) of the case 50.

  As shown in FIGS. 3 and 4, the pressure sensor 60 is formed above a sensor portion 61 (pressure receiving portion) that senses the pressure of intake air to be detected, an annular protruding portion 62 that protrudes downward, and an upper portion. A flat upper surface (end surface) 63 is provided. The pressure sensor 60 is accommodated in the recess 55 of the case 50 and the projecting portion 62 compresses and closely contacts the sensor seal ring 120 fitted in the seal groove 55a, and the intake pressure flowing through the intake passage 10a is The sensor unit 61 detects through the sampling passage 16 and the pressure introduction passage 56.

The sensor cover 70 is formed in a substantially rectangular shape by a resin material, and as shown in FIGS. 1 and 3 to 5, the sensor cover 70 is formed on the outer peripheral edge 71 and the opening end surface 57 on which the latching claws 58 of the case 50 are latched. Reinforcing ribs 72 formed on the outer surface opposite to the opposing side are provided.
The sensor cover 70 presses the upper surface (end surface) 62 of the pressure sensor 60 to compress the sensor seal ring 120 and covers the cover seal ring 130 so as to cover the pressure sensor 60 accommodated in the recess 55. While compressing, the outer peripheral edge 71 is hooked on the hooking claw 58 of the case 50 and is connected to the case 50.
Here, since the reinforcing rib 72 is provided on the sensor cover 70, the overall bending rigidity can be increased, deformation such as warpage and bending can be prevented, and the cover seal ring 130 can be compressed to provide a reliable seal. Function can be obtained.

  As shown in FIG. 3, the temperature sensor 80 is exposed to flowing intake air whose tip is disposed in a substantially central region of the intake passage 10a, and detects the temperature of the intake air.

  As shown in FIG. 3, the opening sensor 90 is formed by a sensor portion 91 embedded in the case 50 and a movable portion 92 fixed to the throttle shaft 30. The sensor unit 91 is configured by a Hall element, a pair of stators through which magnetic flux passes, and the like. The movable portion 92 is formed in a cylindrical shape with a magnet embedded therein, and rotates integrally with the throttle shaft 30. And the opening degree of the valve body 20 is detected by a non-contact type because the movable part 92 rotates relatively with respect to the sensor part 91.

  In the above configuration, the pressure sensor 60, the case 50 that defines the recess 55, the pressure introduction passage 56, and the like, the sensor cover 70, the sensor seal ring 120 that seals between the inner wall surface of the recess 55 and the pressure sensor 60, A sensor unit that detects the intake pressure of the engine is configured by a cover seal ring 130 that is interposed between the sensor cover 70 and the case 50 and seals it.

Next, the assembly of the sensor unit will be described. With the case 50 assembled to the throttle body 10, the sensor seal ring 120 is fitted into the seal groove 55 a formed on the bottom surface of the recess 55.
Subsequently, the pressure sensor 60 is accommodated in the recess 55 so that the protruding portion 62 contacts the sensor seal ring 120.
Subsequently, the cover seal ring 130 is fitted into the seal groove 57 a formed in the opening end surface 57 of the recess 55.

  Subsequently, the sensor cover 70 is brought into contact with the upper surface (end surface) 63 of the pressure sensor 60 to press (compress) the sensor seal ring 120 and at the same time press (compress) the cover seal ring 130. The latching claw 58 is latched and connected to the case 50 by snap-fit coupling. Thereby, the assembly of the sensor unit 40 is completed, the sensor seal ring 120 and the cover seal ring 130 are compressed (with a predetermined compression allowance), and the pressure introduction passage 56 is sealed (blocked) from the outside (atmosphere). .

  Thus, the sensor cover 70 is formed so as to contact the pressure sensor 60 and press the sensor seal ring 120, and the case 50 contacts the outer peripheral edge 71 of the sensor cover 70 and presses the cover seal ring 130. Thus, the entire assembly can be easily performed, and a reliable sealing function can be obtained in a pressure state that does not exceed the detection limit.

  Next, the pressure relief function of this sensor unit will be described. First, when the pressure of the intake air is in a range not exceeding the detection limit, as shown in FIG. 6A, the sensor seal ring 120 and the cover seal ring 130 are Compressed to a predetermined compression margin, completely seals between the pressure sensor 60 and the inner wall surface (wall surface of the seal groove 55a) of the recess 55 and between the sensor cover 70 and the case 50 (open end surface 57). . Thereby, the pressure sensor 60 can detect the pressure of the intake air guided to the pressure introduction passage 56 with high accuracy.

  On the other hand, when the pressure of the intake air exceeds the detection limit, as shown in FIG. 6B, the sensor seal ring 120 and the cover seal ring 130 are elastically deformed beyond the compression allowance that performs the sealing function. The excessive pressure passes through the seal groove 55a between the pressure sensor 60 and the inner wall surface of the recess 55 (the wall surface of the seal groove 55a), and the seal groove between the sensor cover 70 and the case 50 (open end surface 57). Go through 57a. That is, the excessive pressure is released to the outside (atmosphere) through the pressure introduction passage 56 → the seal groove 55a → the recess 55 → the seal groove 57a → the gap C.

As a result, the pressure exceeding the detection limit is released, and an excessive pressure load is prevented from being applied to the pressure sensor 60 or the case 50 and the sensor cover 70, and the pressure sensor 60, the case 50, and the sensor cover 70 are prevented. Etc. can be prevented from being damaged.
Further, when the pressure of the intake air is reduced to a normal detectable range, the sensor seal ring 120 and the cover seal ring 130 are elastically restored to exhibit a desired sealing function.

Here, in particular, the sensor seal ring 120 is disposed in the seal groove 55a formed in the bottom surface of the recess 55, and the cover seal ring 130 is disposed in the seal groove 57a formed in the opening end surface 57. When an excessive pressure is applied, the sensor seal ring 120 and the cover seal ring 130 are elastically deformed in the seal grooves 55a and 57a without causing a positional shift to open a passage for releasing the pressure, and at a normal pressure. When it returns, the seal groove 55a, 57a is elastically restored to the desired seal state, so that the seal function and the pressure relief function can be reversibly and reliably performed.
Further, since the latching claws 58 are intermittently arranged so as to be discontinuously engaged with the outer peripheral edge 71 of the sensor cover 70, the snap-fit coupling by the latching claws 58 is obtained. When an excessive pressure is applied, the excessive pressure can be easily released from the gap C formed in a discontinuous region where the latching claw 58 is not present.

FIG. 7 shows another embodiment of the sensor unit according to the present invention, in which the sensor seal ring 120 ′ and the cover seal ring 130 ′ are changed from the above-described embodiment. The same components as those in FIG.
That is, in this sensor unit, the sensor seal ring 120 ′ is configured to be in close contact with the end surface 62 ′ and the side surface 62 ″ of the protruding portion 62 of the pressure sensor 60 to seal. Further, the cover seal ring 130 ′ is configured such that the two protrusions are in close contact with the sensor cover 70 and sealed.

  Also in this case, as described above, the sensor seal ring 120 'and the cover seal ring 130' reliably perform a sealing function when the intake pressure does not exceed the detection limit, while the intake pressure exceeds the detection limit. In this case, the pressure relief function is surely achieved.

In the above embodiment, the case where the sensor unit 40 is incorporated in a part of the throttle device has been shown. However, the present invention is not limited to this, and the sensor unit 40 is applied only to the intake system of the engine mounted on the motorcycle. May be.
In the above-described embodiment, the temperature sensor 80 and the opening sensor 90 (sensor unit 91) are shown in addition to the pressure sensor 60 as sensors provided in the sensor unit 40, but in addition to the pressure sensor 60, the temperature sensor 80 or A configuration in which one of the opening sensors 90 is provided may be employed.

  In the above embodiment, as the pressure release mechanism, the sensor seal rings 120 and 120 ′ interposed between the recess 55 formed in the case 50 and the pressure sensor 60, and the cover interposed between the sensor cover 70 and the case 50. Although the seal rings 130 and 130 'are shown, the present invention is not limited to this. Other mechanisms that are interposed between any one of the pressure sensor, the case, and the sensor cover to release a pressure of a predetermined level or higher to the atmosphere. Alternatively, another mechanism that releases a pressure of a predetermined level or higher to the atmosphere in a state where the pressure sensor is embedded in a case without a sensor cover or the like may be employed.

  As described above, the sensor unit of the present invention achieves an overpressure exceeding a predetermined level while achieving simplification of the structure, reduction of manufacturing man-hours, ease of assembly work, reduction of capital investment, improvement of quality, etc. Since a pressure release mechanism that releases the pressure of the engine when it is applied is provided, it is useful not only in detecting the pressure in the intake passage of the engine but also in the field of detecting the pressure of fluid other than the engine.

It is an external appearance top view which shows the throttle apparatus containing the sensor unit which concerns on this invention. It is a top view which shows the sensor unit which makes a part of throttle device shown in FIG. It is a longitudinal cross-sectional view of the throttle device in E1-E1 in FIG. It is a longitudinal cross-sectional view of the throttle device in E2-E2 in FIG. FIG. 2 shows a part of a sensor unit according to the present invention, in which (a) is a partial plan view, (b) is a sectional view taken along line E3-E3 in (a), and (c) is E4 in (a). It is sectional drawing in -E4. It is sectional drawing explaining the effect | action of the sensor unit which concerns on this invention, (a) is sectional drawing which shows the state in which the sealing function is working, (b) is sectional drawing which shows the state in which the pressure relief function is working. . It is a fragmentary sectional view showing other embodiments of a sensor unit concerning the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Throttle body 10a Intake passage 15 Flange part 16 Sampling passage 20 Valve body 30 Throttle shaft 40 Sensor unit 50 Case 51 Joining surface 55 Recess 55a Annular seal groove 56 Pressure introduction passage 57 Open end face 57a Annular seal groove 58 Multiple latches Claw 60 Pressure sensor 61 Sensor part 62 Projection part 63 Upper surface (end face)
70 Sensor cover 71 Outer peripheral edge 72 Reinforcing rib 80 Temperature sensor 90 Opening sensor 100 Terminal 110 Seal ring 120, 120 'Sensor seal ring (pressure release mechanism)
130, 130 'Cover seal ring (pressure release mechanism)

Claims (8)

A sensor unit comprising: a pressure sensor; a case for accommodating the pressure sensor and defining a pressure introduction passage for guiding a pressure to be detected;
A pressure release mechanism for releasing the pressure above the predetermined level to the atmosphere when a pressure of a predetermined level or higher is applied to the pressure sensor through the pressure introduction passage;
A sensor unit characterized by that. The case defines a recess for housing the pressure sensor;
Including a sensor cover coupled to the case so as to cover the recess while the pressure sensor is accommodated in the recess;
The pressure release mechanism is formed to be interposed between any of the pressure sensor, the case, and the sensor cover.
The sensor unit according to claim 1. The pressure release mechanism includes an elastically deformable sensor seal ring that is interposed and sealed between an inner wall surface of the recess and the pressure sensor, and an elastic deformation that is interposed and sealed between the sensor cover and the case. Possible cover seal ring,
The sensor unit according to claim 2, comprising: The sensor cover is formed so as to contact the end surface of the pressure sensor and press the sensor seal ring,
The case is formed to contact the outer peripheral edge of the sensor cover and press the cover seal ring.
The sensor unit according to claim 3. The case has a latching claw for connecting the sensor cover by snap-fit coupling.
The sensor unit according to claim 4. The latching pawl is formed by intermittently arranging a plurality of the pawls so as to discontinuously engage with the outer peripheral edge of the sensor cover.
The sensor unit according to claim 5. On the bottom surface of the concave portion, the pressure introduction passage is formed in communication and an annular seal groove for arranging the sensor seal ring is formed around the pressure introduction passage,
An annular seal groove for disposing the cover seal ring is formed on the opening end surface of the recess.
The sensor unit according to claim 3, wherein the sensor unit is a unit. The sensor cover has a reinforcing rib on a surface opposite to a region pressing the cover seal ring.
The sensor unit according to any one of claims 3 to 7, wherein

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