Sensor mounting structure

Abstract

To provide a sensor mounting structure that allows a sensor to be mounted under excellent workability, and further, restricts damages even in a case where erroneous mounting has occurred.SOLUTION: A sensor mounting structure 1 comprises a sensor 110 and a sensor receiving part 120. The sensor receiving part 120 comprises a reception side locking part 124 which protrudes from a seating face 122a and engages with a part of a flange portion 112. The flange portion 112 on the sensor 110 comprises: a sensor side locking part 112a which engages with the reception side locking part 124; and an interference avoidance part 112b which is formed in a shape of avoiding interference with the reception side locking part 124 in a direction of inserting a sensor body 111 into a sensor insertion hole 123, at a section where the sensor body 111 overlaps with the reception side locking part 124 in a state of being inserted into the sensor insertion hole 123 in an erroneous posture of deviating at a certain angle around a central axis X1, from a regular posture P11 at which the sensor side locking part 112a engages with the reception side locking part 124.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a sensor mounting structure for mounting a sensor on a sensor receiving portion.

Background Art

[0002] Conventionally, a sensor mounting structure for mounting a sensor such as a temperature sensor on a sensor receiving portion provided in a device to be measured such as temperature is known (see, for example, Patent Document 1). The sensor mounting structure described in Patent Document 1 has a structure in which a screw is formed on the outer peripheral surface of the sensor, and the sensor is screwed into a screw hole provided in the sensor receiving portion for mounting.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Here, the sensor mounting structure described in Patent Document 1 is a screw fastening structure, and since the mounting posture of the sensor is determined substantially uniquely, the possibility of incorrect mounting is low. On the other hand, strict torque management etc. are required for screw fastening, and there is a problem that workability is not good. In addition, regarding sensor mounting structures other than screw fastening, there is a possibility of incorrect mounting, and there is a problem that when incorrect mounting occurs, there is a risk of damaging the sensor or the sensor receiving portion.

[0005] Therefore, an object of the present invention is to provide a sensor mounting structure that can mount a sensor with good workability and can suppress damage even when incorrect mounting occurs, paying attention to the above problems.

Means for Solving the Problems

[0006] To solve the above problems, the sensor mounting structure includes a rod-shaped sensor body, and a flange portion that projects from the outer peripheral surface of the sensor body in the thickness direction of the sensor body at an intermediate position in the longitudinal direction of the sensor body. A sensor, a sensor receiving portion that supports the sensor in a state where the sensor body is inserted into the sensor insertion hole provided so as to be rotatable around its central axis until the flange portion abuts against the seating surface around the sensor insertion hole. The sensor receiving portion includes a receiving-side locking portion that projects from the seating surface and locks to a part of the flange portion. The flange portion of the sensor includes a sensor-side locking portion that locks to the receiving-side locking portion, and from a normal posture in which the sensor-side locking portion locks to the receiving-side locking portion, the sensor body is inserted into the sensor insertion hole in an incorrect posture displaced by a predetermined angle around the central axis. The sensor insertion hole is formed in a shape that avoids interference with the receiving-side locking portion in a portion that overlaps the receiving-side locking portion in a state where the sensor body is inserted into the sensor insertion hole, and includes an interference avoidance portion formed in a shape that avoids interference with the receiving-side locking portion in the insertion direction of the sensor body into the sensor insertion hole.

Advantages of the Invention

[0007] According to the above sensor mounting structure, the sensor can be mounted with good workability, and even when misattachment occurs, damage can be suppressed.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the sensor mounting structure will be described.

[0010] FIG. 1 is a perspective view showing a sensor mounting structure according to an embodiment, FIG. 2 is a perspective view showing a sensor in the sensor mounting structure shown in FIG. 1, and FIG. 3 is a perspective view showing a sensor receiving portion in the sensor mounting structure shown in FIG. 1.

[0011] The sensor mounting structure 1 of the present embodiment has a structure for attaching a sensor 110 having a rod-shaped sensor body 111 used as, for example, a temperature sensor or the like to a sensor receiving portion 120 provided with a sensor insertion hole 123. The sensor 110 has a sensor body 111 and a flange portion 112. The sensor receiving portion 120 is a cylindrical portion provided on the outer wall 2 of a device or the like to be measured such as temperature, and has a cylindrical main body portion 121 and a thick disk-shaped seating surface portion 122. The sensor insertion hole 123 is formed so as to penetrate the outer wall 2 through the seating surface portion 122 and the cylindrical main body portion 121. In the sensor 110, a detection portion 111a is provided on the tip side in the insertion direction D11 of the sensor body 111 into the sensor insertion hole 123, and the sensor 110 is attached to the sensor receiving portion 120 so that the detection portion 111a penetrates the outer wall 2 and reaches the inside of the device or the like. Further, the end portion of the sensor body 111 on the side opposite to the detection portion 111a is a gripping portion 111b that an operator grips when attaching the sensor 110.

[0012] In the rod-shaped sensor body 111, the detection portion 111a and the intermediate portion 111c are cylindrical portions where the detection portion 111a has a small diameter and the intermediate portion 111c has a large diameter. On the other hand, the gripping portion 111b is a flat shape that is easy for the operator to grip, and the cross section of the sensor body 111 with respect to the central axis X1 is elliptical.

[0013] The flange portion 112 in the sensor 110 is a substantially disk-shaped portion that projects from the outer peripheral surface 111d of the sensor body 111 in the thickness direction D13 of the sensor body 111 at an intermediate position in the longitudinal direction D12 of the sensor body 111.

[0014] Around the sensor insertion hole 123 in the seating surface 122 of the sensor receiving portion 120, there is a seating surface 122a against which the flange portion 112 abuts when the sensor body 111 is inserted into the sensor insertion hole 123. The sensor body 111 is inserted into the sensor insertion hole 123 so as to be rotatable about its central axis X1, and the sensor receiving portion 120 supports the sensor 110 with the sensor body 111 inserted into the sensor insertion hole 123 until the flange portion 112 abuts against the seating surface 122a. And, provided on this sensor receiving portion 120 is a receiving-side locking portion 124 that protrudes from the seating surface 122a and locks to a sensor-side locking portion 112a, which will be described later, that is a part of the flange portion 112.

[0015] On the other hand, provided on the flange portion 112 of the sensor 110 are a sensor-side locking portion 112a and an interference avoidance portion 112b.

[0016] The sensor-side locking portion 112a is a portion that locks to the receiving-side locking portion 124 when the sensor 110 is attached in the normal posture P11 shown in FIG. 1. Here, in the present embodiment, the sensor-side locking portion 112a is a cantilever-shaped portion, which will be described later, and a locking hook 112a-1 that locks to the receiving-side locking portion 124 is formed at its free end.

[0017] When attaching the sensor 110 to the sensor receiving portion 120, first, the sensor body 111 is inserted into the sensor insertion hole 123 with the locking hook 112a-1 of the sensor-side locking portion 112a separated from the receiving-side locking portion 124 around the central axis X1. Thereafter, it is rotated in the locking rotation direction D14 in which the locking hook 112a-1 approaches the receiving-side locking portion 124 until the locking hook 112a-1 locks to the receiving-side locking portion 124, reaching the normal posture P11.

[0018] The cantilever - shaped sensor - side locking portion 112a with a locking hook 112a - 1 formed at its free end is formed by providing a cut 112a - 2 that extends along the outer periphery of the flange portion 112 from the front side to the rear side in the locking rotation direction D14. In this sensor - side locking portion 112a, the rear side in the locking rotation direction D14 is the fixed end and the front side is the free end, and the locking hook 112a - 1 is formed at its free end. After the sensor body 111 is inserted, when the sensor 110 is rotated in the locking rotation direction D14, the sensor - side locking portion 112a deflects toward the central axis X1 and the locking hook 112a - 1 gets over the receiving - side locking portion 124 and reaches the normal posture P11. In this normal posture P11, the locking hook 112a - 1 locks to the receiving - side locking portion 124.

[0019] Also, a sensor - side guide inclined surface 112a - 3 is formed on the front side in the locking rotation direction D14 of the locking hook 112a - 1, and a receiving - side guide inclined surface 124a is formed on the rear side in the locking rotation direction D14 of the receiving - side locking portion 124. When the sensor 110 is rotated in the locking rotation direction D14, the sensor - side guide inclined surface 112a - 3 and the receiving - side guide inclined surface 124a slide against each other to guide the locking hook 112a - 1 to get over the receiving - side locking portion 124.

[0020] Further, the interference avoidance portion 112b provided on the flange portion 112 is a portion for avoiding interference between the flange portion 112 and the receiving-side locking portion 124 when the sensor body 111 is inserted in an incorrect posture deviated by a predetermined angle around the central axis X1 from the above-described normal posture P11. This interference avoidance portion 112b is formed in a portion of the flange portion 112 that overlaps with the receiving-side locking portion 124 in a state where the sensor body 111 is inserted in an incorrect posture. And the interference avoidance portion 112b is formed in a shape that avoids interference with the receiving-side locking portion 124 in the insertion direction D11 of the sensor body 111 into the sensor insertion hole 123. Specifically, the interference avoidance portion 112b is formed with a recessed portion 112b-1 that is recessed in an L shape from the outer periphery of the flange portion 112 toward the central axis X1 of the sensor body 111, and the receiving-side locking portion 124 in the incorrect posture is accommodated inside the recessed portion 112b-1. Here, in the present embodiment, the incorrect posture is an inverted posture deviated by 180° around the central axis X1 from the normal posture P11 as will be described in detail later. For this reason, the recessed portion 112b-1 in the interference avoidance portion 112b is provided so as to include a portion deviated by 180° around the central axis X1 with respect to the sensor-side locking portion 112a.

[0021] Also, in the present embodiment, a pair of retaining protrusions 111e are provided on the sensor body 111 so as to protrude from the outer peripheral surface 111d in the thickness direction D13 on the front side of the flange portion 112 with respect to the insertion direction D11. On the other hand, the sensor receiving portion 120 is provided with a pair of protrusion passage paths 125 through which the pair of retaining protrusions 111e pass one by one when the sensor body 111 is inserted.

[0022] FIG. 4 is a perspective view showing how the retaining protrusions shown in FIGS. 1 and 2 pass through the protrusion passage paths shown in FIGS. 1 and 3 and function as retaining means, as viewed from the back side with respect to the seating surface in the sensor receiving portion. FIG. 5 is a view showing in cross section along the central axis of the sensor body in the sensor mounting structure how the retaining protrusions shown in FIGS. 1 and 2 pass through the protrusion passage paths shown in FIGS. 1 and 3 and function as retaining means.

[0023] As described above, the pair of retaining protrusions 111e protruding from the rod-shaped sensor body 111 in the thickness direction D13 of the sensor 110 are provided on the front side of the flange portion 112 with respect to the insertion direction D11. Further, the pair of retaining protrusions 111e are columnar protrusions provided at positions shifted from each other by 180° around the central axis X1 of the sensor body 111.

[0024] As described above, in the sensor mounting structure 1, the sensor body 111 is inserted into the sensor insertion hole 123, and the sensor 110 is rotated in the locking rotation direction D14 to reach the normal posture P11. The sensor receiving portion 120 is provided with a pair of protrusion passage paths 125 through which the pair of retaining protrusions 111e pass one by one when the locking hook 112a-1 of the sensor-side locking portion 112a is inserted into the sensor body 111 in a state of being separated from the receiving-side locking portion 124 around the central axis X1. These pair of protrusion passage paths 125 are formed by cutting the disk-shaped seat surface portion 122 radially outward from the inner peripheral edge of the sensor insertion hole 123. When the sensor 110 reaches the normal posture P11, the retaining protrusion 111e that has passed through the protrusion passage path 125 is displaced from the protrusion passage path 125 and rotates and moves in the locking rotation direction D14. Then, the retaining protrusion 111e functions as a stopper by sandwiching a part of the seat surface wall 126, which is a part of the sensor receiving portion 120, between itself and the flange portion 112. The part of the seat surface wall 126 is an outer wall portion including a portion adjacent to the protrusion passage path 125 on the front side in the locking rotation direction D14 on the seat surface 122a of the seat surface portion 122. And on the back side of the seat surface 122a of this part of the seat surface wall 126, a housing space 127 is formed in which the retaining protrusion 111e that has passed through the protrusion passage path 125 is rotatably housed in the locking rotation direction D14.

[0025] According to the sensor mounting structure 1 described above, the sensor 110 is attached to the sensor receiving portion 120 by inserting the sensor body 111 into the sensor insertion hole 123 and locking the sensor-side locking portion 112a to the receiving-side locking portion 124. In this sensor mounting structure 1, since a screw fastening structure is not used, torque management and the like are unnecessary, and thus the sensor 110 can be mounted with good workability. Further, according to this sensor mounting structure 1, when a misattachment occurs in an incorrect posture deviated by 180° around the central axis X1 from the normal posture P11, the interference avoidance portion 112b of the flange portion 112 suppresses damage to the sensor 110 and the sensor receiving portion 120 as the mounting location as follows.

[0026] FIG. 6 is a diagram showing a comparative example of the sensor mounting structure of FIGS. 1 to 5 in order to explain that damage to the sensor and the sensor receiving portion can be suppressed when a misattachment occurs in an incorrect posture. Further, FIG. 7 is an explanatory diagram showing how damage to the sensor and the sensor receiving portion can be suppressed when a misattachment occurs in the sensor mounting structure of FIGS. 1 to 5 with respect to the comparative example shown in FIG. 6. In FIG. 6, components equivalent to those shown in FIGS. 1 to 5 and FIG. 7 are denoted by the same reference numerals as in FIGS. 1 to 5 and FIG. 7 (mainly FIG. 7), and redundant descriptions of these equivalent components will be omitted below.

[0027] In the sensor mounting structure 5 of the comparative example shown in FIG. 6, the interference avoidance portion 112b that is responsible for suppressing damage when a misattachment occurs in the present embodiment is not provided on the flange portion 512. The sensor mounting structure 5 of the comparative example has a configuration equivalent to that of the sensor mounting structure 1 of the present embodiment in other respects. In this sensor mounting structure 5 of the comparative example, similar to the sensor mounting structure 1 of the present embodiment, there is a possibility that a misattachment may occur in which the incorrect posture P12 is an inverted posture deviated by 180° around the central axis X1 from the normal posture P11. In this case, in the sensor mounting structure 5 of the comparative example, the receiving-side locking portion 124 in the sensor receiving portion 120 and the flange portion 512 in the sensor 510 interfere with each other, and there is a risk that either one or both may be damaged.

[0028] In contrast, in the sensor mounting structure 1 of the present embodiment, when misattachment occurs in the incorrect posture P12, interference between the receiving-side locking portion 124 in the sensor receiver 120 and the flange portion 112 in the sensor 110 is avoided by the interference avoidance portion 112b. According to the sensor mounting structure 1 of the present embodiment, damage to the sensor 110 and the sensor receiver 120 when misattachment occurs can be suppressed by this interference avoidance. Thus, according to the above-described sensor mounting structure 1, the sensor 110 can be mounted with good workability, and damage can be suppressed even when misattachment occurs.

[0029] Here, in the present embodiment, the interference avoidance portion 112b in the flange portion 112 is a portion that houses the receiving-side locking portion 124 in the incorrect posture P12 inside the recess 112b-1. According to this configuration, by housing the receiving-side locking portion 124 inside the recess 112b-1 formed in the interference avoidance portion 112b, interference between the flange portion 112 and the receiving-side locking portion 124 when misattachment occurs in the incorrect posture P12 can be effectively avoided.

[0030] Further, in the present embodiment, after the sensor body 111 is inserted into the sensor insertion hole 123 with the sensor-side locking portion 112a separated from the receiving-side locking portion 124, the sensor 110 is rotated in the locking rotation direction D14 to reach the normal posture P11. According to this configuration, the sensor 110 is mounted by two steps of operation: insertion of the sensor body 111 with the sensor-side locking portion 112a separated from the receiving-side locking portion 124, and rotation of the sensor 110 in the locking rotation direction S14. Since the mounting operation of the sensor 110 is thus divided into two steps, compared with a structure that can be mounted in one step, the operator has an increased chance of noticing misattachment due to the incorrect posture P12, so the occurrence of misattachment can be suppressed.

[0031] Also, in the present embodiment, when the sensor main body 111 is inserted into the sensor insertion hole 123 in the incorrect posture P12, the interference avoidance unit 112b restricts the rotation of the sensor 110 in the locking rotation direction D14 by interfering with the receiving-side locking portion 124 about the central axis X1. According to this configuration, when a misattachment occurs, the rotation of the sensor 110 in the locking rotation direction D14 is restricted, so that it is easier for the operator to notice the misattachment, and the occurrence of misattachment can be further suppressed.

[0032] Also, in the present embodiment, the sensor-side locking portion 112a is a cantilever-shaped portion with the rear side in the locking rotation direction D14 as the fixed end and the front side as the free end, and a locking hook 112a-1 that locks to the receiving-side locking portion 124 is formed at the free end. When the sensor 110 is rotated in the locking rotation direction D14, the sensor-side locking portion 112a bends toward the central axis X1 and the locking hook 112a-1 gets over the receiving-side locking portion 124 and locks. According to this configuration, when the sensor 110 is correctly attached in the normal posture P11, the operator can feel the click feeling caused by the locking hook 112a-1 getting over the receiving-side locking portion 124 and locking. The operator can more easily notice the misattachment based on the presence or absence of this click feeling, and the occurrence of misattachment can be further suppressed.

[0033] Also, in the present embodiment, when the sensor 110 is rotated in the locking rotation direction D14, the sensor-side guide inclined surface 112a-3 and the receiving-side guide inclined surface 124a slide against each other to guide the locking hook 112a-1 to get over the receiving-side locking portion 124. According to this configuration, due to the sliding of the sensor-side guide inclined surface 112a-3 and the receiving-side guide inclined surface 124a, the resistance when the locking hook 112a-1 gets over the receiving-side locking portion 124 is reduced, so that the workability regarding the attachment of the sensor 110 can be further improved.

[0034] Further, in the present embodiment, a pair of retaining protrusions 111e are provided on the sensor body 111, and a pair of protrusion passageways 125 through which the retaining protrusions 111e pass one by one are formed in the sensor receiving portion 120. Further, in the sensor receiving portion 120, a housing space 127 for the retaining protrusion 111e is formed on the back side of a partial seating surface wall 126 that is adjacent to the front side in the locking rotation direction D14 of each protrusion passageway 125. According to this configuration, attachment of the sensor 110 in a posture other than the posture in which the retaining protrusion 111e can pass through the protrusion passageway 125 is avoided, so that the occurrence of incorrect attachment can be further suppressed. Further, since the retaining protrusion 111e positioned inside the housing space 127 and the flange portion 112 sandwich the partial seating surface wall 126 adjacent to the protrusion passageway 125, the sensor 110 can be attached to the sensor receiving portion 120 in a stable state.

[0035] Further, in the present embodiment, a pair of retaining protrusions 111e are provided so as to be 180° apart from each other around the central axis X1, and the incorrect posture P12 is an inverted posture shifted 180° around the central axis X1 from the normal posture P11. According to this configuration, the sensor 110 can be balancedly retained by a pair of necessary minimum retaining protrusions 111e arranged at positions rotationally symmetric with respect to the central axis X1. Further, by setting the deviation angle of the incorrect posture P12 from the normal posture P11 to a large angle of 180°, the occurrence of incorrect attachment in this incorrect posture P12 can be further suppressed.

[0036] Note that the embodiments described above merely show typical forms of the sensor attachment structure. The sensor attachment structure is not limited to this and can be implemented with various modifications.

[0037] For example, in the above-described embodiment, as an example of the sensor attachment structure, a sensor attachment structure 1 in which a sensor 110 used as, for example, a temperature sensor or the like is attached to a sensor receiving portion 120 provided on the outer wall 2 of a device or the like to be measured such as temperature is illustrated. However, the sensor attachment structure is not limited to this, and the specific type of the sensor and the specific installation location of the sensor receiving portion can be appropriately set according to the detection purpose and the like.

[0038] Also, in the above-described embodiment, as an example of the sensor, a sensor 110 is exemplified which includes a sensor body 111 composed of a small-diameter detection portion 111a, a large-diameter intermediate portion 111c, and a flat-shaped gripping portion 111b, and a substantially disc-shaped flange portion 112. Further, as an example of the sensor receiving portion, a sensor receiving portion 120 having a cylindrical tube main body portion 121 and a thick disc-shaped seating surface portion 122 is exemplified. However, the sensor and the sensor receiving portion are not limited to these. As long as the sensor has a rod-shaped sensor body and a flange portion protruding in the thickness direction thereof, the specific shape and the like of each part are not questioned thereby. Also, as long as the sensor receiving portion is provided with a sensor insertion hole into which the sensor body is rotatably inserted and supports the sensor in a state where the sensor body is inserted until the flange portion abuts against the seating surface around it, the specific shape and the like of each part are not questioned thereby.

[0039] Also, in the above-described embodiment, as an example of the interference avoidance portion, an interference avoidance portion 112b that houses the receiving-side locking portion 124 in the case of the error posture P12 inside a recess 112b-1 that is recessed from the outer periphery of the flange portion 112 toward the central axis X1 is exemplified. However, the interference avoidance portion is not limited to this, and it may be a portion where a depression that is recessed in the thickness direction of the flange portion and houses the receiving-side locking portion in the case of the error posture inside, or a through hole that penetrates the flange portion in the thickness direction and houses the receiving-side locking portion in the case of the error posture is formed. That is, as long as the interference avoidance portion is formed in a shape that avoids interference with the receiving-side locking portion in the case of the error posture with respect to the insertion direction of the sensor body, the specific shape and the like thereof are not questioned. However, as described above, according to the interference avoidance portion 112b in which the recess 112b-1 that is recessed from the outer periphery toward the central axis X1 is formed, the interference in the error posture P12 can be effectively avoided.

[0040] In the above-described embodiment, as an example of the sensor mounting structure, the sensor mounting structure 1 is exemplified in which after the sensor main body 111 is inserted into the sensor insertion hole 123, the sensor 110 is rotated in the locking rotation direction D14 so that the sensor-side locking portion 112a is locked to the receiving-side locking portion 124. However, the sensor mounting structure is not limited to this, and for example, a structure in which the sensor-side locking portion is locked to the receiving-side locking portion simultaneously with the insertion of the sensor main body into the sensor insertion hole may be used. However, according to the structure in which the sensor-side locking portion 112a is locked to the receiving-side locking portion 124 in two steps of insertion and rotation of the sensor main body 111, the occurrence of incorrect mounting can be suppressed as described above.

[0041] In the above-described embodiment, as an example of the sensor mounting structure, the sensor mounting structure 1 is exemplified in which the rotation of the sensor 110 in the locking rotation direction D14 in the incorrect posture P12 is restricted by the interference between the interference avoidance portion 112b and the receiving-side locking portion 124. However, the sensor mounting structure is not limited to this, and the rotation of the sensor in the locking rotation direction in the incorrect posture may not be particularly restricted. However, according to the rotation restriction of the sensor 110 in the incorrect posture P12, the occurrence of incorrect mounting can be further suppressed as described above.

[0042] In the above-described embodiment, as an example of the sensor-side locking portion, the cantilever-shaped sensor-side locking portion 112a in which the locking hook 112a-1 that locks to the receiving-side locking portion 124 is formed at the free end is exemplified. However, the sensor-side locking portion is not limited to this, and it does not matter what the specific locking structure is with respect to the sensor receiving portion. However, according to the cantilever-shaped sensor-side locking portion 112a in which the locking hook 112a-1 is formed at the free end, the occurrence of incorrect mounting can be further suppressed based on the presence or absence of a clicking feeling that occurs when the sensor 110 is mounted in the normal posture, as described above.

[0043] In addition, in the above-described embodiments, as an example of each of the locking hook and the receiving-side locking portion, the locking hook 112a-1 provided with the sensor-side guide inclined surface 112a-3 and the receiving-side locking portion 124 provided with the receiving-side guide inclined surface 124a are illustrated. However, the locking hook and the receiving-side locking portion are not limited to these, and any inclined surfaces that do not rub against each other when the sensor rotates may be provided. However, according to the structure in which the sensor-side guide inclined surface 112a-3 and the receiving-side guide inclined surface 124a rub against each other when the sensor 110 rotates, the workability regarding the attachment of the sensor 110 can be further improved as described above.

[0044] In addition, in the above-described embodiments, as an example of the sensor attachment structure, the sensor attachment structure 1 in which a pair of retaining projections 111e are provided on the sensor main body 111, and a pair of projection passageways 125 and a pair of accommodation spaces 127 are provided in the sensor receiving portion 120 is illustrated. However, the sensor attachment structure is not limited to this, and no retaining projections may be provided on the sensor main body, and no passageways or accommodation spaces corresponding to the retaining projections may be provided in the sensor receiving portion. However, according to the sensor attachment structure 1 provided with the retaining projections 111e, the projection passageways 125, and the accommodation spaces 127, the occurrence of misattachment can be further suppressed, and the sensor 110 can be attached to the sensor receiving portion 120 in a stable state as described above.

[0045] In the above-described embodiment, as an example of the sensor mounting structure, a pair of retaining protrusions 111e are provided so as to be separated from each other by 180°, and the sensor mounting structure 1 in which the incorrect posture P12 is an inverted posture shifted by 180° from the normal posture P11 is illustrated. However, the sensor mounting structure is not limited to this. As long as at least a pair of retaining protrusions are provided, the specific number of the retaining protrusions, the specific positional relationship of the incorrect posture with respect to the normal posture, and the like can be set as appropriate. However, according to the sensor mounting structure 1 in which a pair of retaining protrusions 111e are provided as described above and the incorrect posture P12 is the above-described inverted posture, the sensor 110 can be retained in a well-balanced manner, and the occurrence of incorrect mounting in the incorrect posture P12 can be further suppressed as described above.

Explanation of Signs

[0046] 1 Sensor mounting structure 2 Outer wall 110 Sensor 111 Sensor body 111a Detection part 111b Gripping part 111c Intermediate part 111d Outer peripheral surface 111e Retaining protrusion 112 Flange part 112a Sensor-side locking part 112a-1 Locking hook 112a-2 Notch 112a-3 Sensor-side guiding inclined surface 112b Interference avoidance part 112b-1 Concave part 120 Sensor receiving part 121 Cylindrical main body part 122 Seat surface part 122a Seat surface 123 Sensor insertion hole 124 Receiver-side locking part 124a Receiver-side guiding inclined surface 125 Protrusion passage 126 Part of the seat surface wall 127 Accommodation space D11 Insertion direction D12 Longitudinal direction D13 Thickness direction D14 Locking rotation direction P11 Normal posture P12 Incorrect posture X1 Central axis

Claims

1. A sensor having a rod-shaped sensor body and a flange portion protruding from the outer peripheral surface of the sensor body in the thickness direction of the sensor body at an intermediate position in the longitudinal direction of the sensor body, a sensor receiving portion that is provided with a sensor insertion hole into which the sensor body is rotatably inserted around its central axis, and supports the sensor in a state where the sensor body is inserted into the sensor insertion hole until the flange portion abuts against a seating surface around the sensor insertion hole, wherein the sensor receiving portion, comprises a receiving-side locking portion that protrudes from the seating surface and locks to a part of the flange portion, wherein the flange portion of the sensor, comprises a sensor-side locking portion that locks to the receiving-side locking portion, and an interference avoidance portion formed in a shape that avoids interference with the receiving-side locking portion in the insertion direction of the sensor body into the sensor insertion hole at a portion overlapping the receiving-side locking portion in a state where the sensor body is inserted into the sensor insertion hole in an incorrect posture deviated by a predetermined angle around the central axis from a normal posture in which the sensor-side locking portion locks to the receiving-side locking portion, characterized by comprising the above. A sensor mounting structure.

2. The interference avoidance portion in the flange portion is formed with a recess that is recessed from the outer periphery of the flange portion toward the central axis of the sensor body, and is a portion that houses the receiving-side locking portion in the incorrect posture, according to claim 1, the sensor mounting structure characterized by this.

3. The sensor is such that after the sensor body is inserted into the sensor insertion hole with the sensor-side locking portion separated from the receiving-side locking portion around the central axis, the sensor-side locking portion is rotated in a locking rotation direction approaching the receiving-side locking portion until the sensor-side locking portion locks to the receiving-side locking portion to reach the normal posture, according to claim 1, the sensor mounting structure characterized by this.

4. The interference avoidance portion restricts rotation of the sensor in the locking rotation direction by interfering with the receiving-side locking portion around the central axis in a state where the sensor body is inserted into the sensor insertion hole in the incorrect posture, according to claim 3, the sensor mounting structure characterized by this.

5. The sensor-side locking portion is a cantilever-shaped portion formed by providing a notch along the outer periphery of the flange portion from the front side to the rear side in the locking rotation direction, with the rear side being the fixed end and the front side being the free end. A locking hook that locks to the receiving-side locking portion is formed at the free end. When the sensor is rotated in the locking rotation direction, it bends toward the central axis and the locking hook climbs over and locks to the receiving-side locking portion. The sensor mounting structure according to claim 3, characterized in that.

6. On each of the front side of the locking hook in the locking rotation direction and the rear side of the receiving-side locking portion in the locking rotation direction, guiding inclined surfaces are formed that rub against each other when the sensor is rotated in the locking rotation direction to guide the locking hook over the receiving-side locking portion. The sensor mounting structure according to claim 5, characterized in that.

7. On the sensor body, a retaining projection that protrudes in the thickness direction from the outer peripheral surface on the front side of the flange portion in the insertion direction. When the sensor body is inserted into the sensor insertion hole and the sensor is rotated in the locking rotation direction to reach the normal posture, at least a pair of retaining projections are provided that function as a retaining means by sandwiching a part of the sensor receiving portion between them and the flange portion. In the sensor receiving portion, a projection passage through which each of the retaining projections passes when the sensor body is inserted into the sensor insertion hole with the sensor-side locking portion separated from the receiving-side locking portion around the central axis is formed by cutting from the inner peripheral edge of the sensor insertion hole radially outward. Further, a receiving space for the retaining projection is formed on the back side of each of the partial seat surface walls with respect to the seat surface so that a part of the seat surface wall including a portion adjacent to the front side in the locking rotation direction in each of the projection passages is sandwiched between the flange portion and the retaining projection in the normal posture. The sensor mounting structure according to claim 3, characterized in that.

8. The retaining projections are provided in a pair, separated from each other by 180° around the central axis. The incorrect posture is a reversed posture shifted by 180° around the central axis from the normal posture. The sensor mounting structure according to claim 7, characterized in that.

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