JP4635391B2 - Pressure sensor mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pressure sensor mounting structure that is mounted on an outer surface of a mounting body on which a pressure sensor is mounted.
[0002]
[Prior art]
Conventionally, as a pressure sensor mounting structure that is mounted on the outer surface of a mounting body to which the pressure sensor is mounted, a fastening means such as a screw is configured on the outer surface of the mounting body, and a flange that the pressure sensor has by using this fastening means The pressure sensor is attached by screwing the part and the like.
[0003]
[Problems to be solved by the invention]
However, a fastening means such as a screw requires a screw part and increases the number of parts. In addition, it is necessary to perform an operation of tightening a screw or the like, and the assembly performance of the tightening operation is poor, so that the mounting of the pressure sensor increases the cost burden.
[0004]
In view of the above points, an object of the present invention is to provide a pressure sensor mounting structure that can reduce the number of components and improve assemblability.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problem, according to the pressure sensor mounting structure of the first aspect of the present invention, the mounting body to which the pressure sensor is mounted is formed of a resin material and protrudes from the outer surface of the mounting body. Only one snap-fit portion formed so as to be provided. In addition, the case is integrally formed with a flange having a shape parallel to the direction in which the pressure introducing tube is inserted into the sensor mounting hole, and the pressure introducing tube is inserted into the sensor mounting hole on the outer surface of the mounting body. When this is done, a guide wall is provided protruding so as to guide and pinch the buttock. The snap-fit portion is characterized in that the case is attached and fixed to the outer surface while holding the case in the direction in which the pressure introducing tube is inserted into the sensor mounting hole. The snap-fit portion is provided with a protrusion on one side and an undercut on the other to have the above-described holding function, and can be attached and detached as well as holding (fixing).
[0006]
Thereby, the pressure introduction pipe of the pressure sensor (case) is held in the direction in which it is inserted into the sensor mounting hole by the snap fit portion provided on the outer surface of the mounting body. On the other hand, movement in the front-rear and left-right directions on the outer surface of the pressure sensor (case) is restrained by insertion of the pressure introduction pipe into the sensor mounting hole. In other words, the pressure sensor is fixed on the outer surface of the mounting body in a stable manner in the front / rear, left / right, and upper / lower directions. It becomes easier than tightening. That is, it is possible to provide a pressure sensor mounting structure in which the number of parts can be reduced and the ease of assembly can be improved.
[0007]
In addition, the case is integrally formed with a flange having a shape that is parallel to the direction in which the pressure introducing tube is inserted into the sensor mounting hole, and when the pressure introducing tube is inserted into the sensor mounting hole on the external surface A guide wall that guides and clamps so as to sandwich the collar portion is provided to protrude.
[0008]
As a result, the guide wall guides and holds the collar portion so as to sandwich the collar portion, and firmly restrains the movement of the pressure sensor position in the front-rear and left-right directions on the outer surface of the mounting body. Therefore, the holding in the direction in which the pressure introducing pipe of the pressure sensor by the snap fit portion is inserted into the sensor mounting hole portion can be stabilized. That is, the inclination of the pressure sensor due to slight movement of the pressure sensor in the front-rear and left-right directions is eliminated, and the snap-fit portion is prevented from being detached from the case.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. Note that the pressure sensor mounting structure described below is a pressure sensor mounting structure that can be mounted on the external surface of the mounting body, so that the number of parts can be reduced without using fastening means such as screws on the external surface of the mounting body. The present invention relates to a technology capable of providing a pressure sensor mounting structure with improved performance.
[0010]
(First embodiment)
FIG. 1 is a configuration diagram showing a pressure sensor mounting structure according to a first embodiment of the present invention. FIG. 1 (a) is a partial sectional view, and FIG. 1 (b) is a top view of FIG. 1 (a). It is the top view seen from.
[0011]
The pressure sensor 1 includes, for example, a resin case 2 in which a part including a pressure detection unit (not shown) including a pressure responsive displacement member such as a diaphragm, a semiconductor element, and the like is accommodated, and the case 2 protrudes to the outside. And a pressure introducing pipe 3. The surge tank 4 as a mounting body for detecting pressure is formed of a resin material such as nylon resin, and includes a sensor mounting hole 5 that opens on the outer surface 4a of the surge tank 4. The pressure introducing tube 3 is inserted into the sensor mounting hole 5 described above, and the tip of the pressure introducing tube 3 opens into the sensor mounting hole 5 so that the pressure in the sensor mounting hole 5 is displaced by pressure in the case 2. It is the structure which guides to the site | part of a member (not shown). Note that an O-ring 6 serving as a seal member is interposed between the outer peripheral portion of the pressure introducing pipe 3 and the inner peripheral portion of the sensor mounting hole portion 5 to seal the ventilation with the outside of the surge tank 4. Reference numeral 7 denotes a connector which transmits a detection signal detected by the pressure detector to an internal combustion engine electronic control device (not shown).
[0012]
Two snap fit portions 8 formed so as to protrude from the outer surface 4a are provided. The two snap fit portions 8 are each provided with a protruding portion 8a on one side and an undercut portion 8b on the other side. Then, after the pressure introducing tube 3 is inserted into the sensor mounting hole 5, the bottom surface 2a of the case 2 comes into contact with the outer surface 4a and the pressure sensor 1 is positioned on the outer surface 4a. The portion 8 a holds the case 2 in the direction in which the pressure introducing tube 3 is inserted into the sensor mounting hole 5. Specifically, the protrusion 8 a is configured to lock the upper surface 2 b of the case 2 positioned in parallel with the bottom surface 2 a of the case 2. The snap fit portion 8 can be attached and detached as well as holding (fixing) the case 2. In the present embodiment, the snap fit portion 8 is disposed so as to face the position sandwiching the case 2 from both sides. However, if at least one snap fit portion 8 is provided, the case 2 can be held in the direction in which the pressure introducing tube 3 is inserted into the sensor mounting hole 5 (described later). However, if a plurality of snap-fit portions 8 are provided, the case 2 can be held firmly.
[0013]
Next, the process of attaching and fixing the pressure sensor 1 to the surge tank 4 will be described with reference to FIG. 2A shows a state before the pressure sensor 1 is fixedly attached, FIG. 2B shows a state where the pressure sensor 1 is fixedly attached, and FIG. 2C shows that the pressure sensor 1 is fixedly attached. Shown later.
[0014]
The pressure sensor 1 is pushed down from the upper side in FIG. 2 from the state of FIG. 2A to the state of FIG. 2B so that the pressure introducing tube 3 is inserted into the sensor mounting hole 5. Assembled to. In the depression process of the pressure sensor 1 (FIG. 2B), the protrusion 8a is bent by the case 2 and is expanded so as to increase the distance between the protrusions 8a of the two snap fit portions 8. Then, when the bottom surface 2a of the case 2 comes into contact with the outer surface 4a and the pressure sensor 1 is positioned on the outer surface 4a, the expanded snap fit portion 8 is in the original state shown in FIG. Returning to FIG. 8, the protrusion 8 a is positioned so as to lock the upper surface 2 b of the case 2. The movement of the protrusion 8a is due to the snap fit portion 8 being formed of an elastic resin material (nylon resin or the like). That is, the two protrusions 8a of the snap fit portion 8 disposed in the opposite position with the case 2 interposed therebetween hold the case 2 in the direction in which the pressure introducing tube 3 is inserted into the sensor mounting hole 5. This state is shown in FIG.
[0015]
In this manner, the pressure introducing pipe 3 of the pressure sensor 1 is held in the direction in which it is inserted into the sensor mounting hole 5 by the snap fit portion 8 provided on the outer surface 4 a of the surge tank 4. On the other hand, the movement of the pressure sensor (case 2) 1 in the front-rear and left-right directions on the outer surface 4a is restrained by insertion of the pressure introduction pipe 3 into the sensor mounting hole 5. In other words, the pressure sensor 1 is fixed on the outer surface 4a of the mounting body in a stable position in the front-rear, left-right, and upper-lower directions, so that no additional parts such as screws are required and the mounting method is also easy. This is easier than tightening screws. That is, it is possible to provide an attachment structure for the pressure sensor 1 that can reduce the number of parts and improve the assemblability.
[0016]
(Second Embodiment)
FIG. 3 is a perspective view showing the mounting structure of the pressure sensor 1A according to the second embodiment of the present invention. FIG. 3A shows a state before the pressure sensor 1A is fixed, and FIG. FIG. 2 shows the pressure sensor 1A after being fixed. Components that are substantially the same as those of the first embodiment shown in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof is omitted. 3 is provided with a flange 20 and a guide wall 21 for guiding and sandwiching the flange 20 with respect to the mounting structure of the pressure sensor 1 shown in FIGS. 1 and 2 (described later). The difference is that the movement of the pressure sensor 1A on the outer surface 24a of the surge tank 24 in the position of the pressure sensor 1A in the front-rear and left-right directions is firmly stopped. Moreover, the surge tank 24 shown in FIG. 3 shows a part of the surge tank 24.
[0017]
The case 22 is integrally formed with a flange 20 having a shape parallel to the direction in which the pressure introducing tube 23 is inserted into the sensor mounting hole 25. The outer surface 24a of the surge tank 24 is provided with a guide wall 21 that protrudes and guides and sandwiches the flange 20 when the pressure introducing tube 23 is inserted into the sensor mounting hole 25. Specifically, the flange portion 20 is formed on the side surface end portion (A portion in FIG. 3) of the case 22 and is formed so as to protrude from the side surface end portion in both directions, and corresponds to the flange portion 20 protruding in both directions. A guide wall 21 is formed.
[0018]
As in the first embodiment, the snap fit portion 28 has a protrusion 28a and is formed so as to protrude from the outer surface 24a, and the protrusion 28a of the snap fit portion 28 is a side end of the case 22 (see FIG. 3), the case 22 is held in the direction in which the pressure introducing tube 23 is inserted into the sensor mounting hole 25.
[0019]
In this manner, the guide wall 21 guides and holds the flange portion 20 so as to firmly restrain the front-rear and left-right movements at the position of the pressure sensor 1A on the outer surface 24a of the surge tank 24. Thus, the snap fit portion 28 can stabilize the holding in the direction in which the pressure introducing tube 23 of the pressure sensor 1A is inserted into the sensor mounting hole 25. That is, the flange portion 20 and the guide wall 21 eliminate the inclination of the pressure sensor 1A due to slight movements of the pressure sensor 1A in the front-rear and left-right directions, and prevent the snap-fit portion 28 from being detached from the case 22.
[0020]
In the implementation of the present invention, the example of the surge tanks 2 and 24 is shown as the mounting body. However, the present invention is not limited to this, and has a substantially flat surface (external surfaces 4a, 24a, etc.) to which the pressure sensor can be attached. If so, the mounting structure of the pressure sensor of the present invention can be realized.
[0021]
In the implementation of the present invention, an example of a surge tank 4 is shown as an attachment body to which the pressure sensor 1 is attached, and the pressure introduction pipes 3 and 23 are directly connected to the sensor attachment hole portion 5 opened on the outer surface of the surge tank 4. The pressure was detected by inserting. However, the mounting body to which the pressure sensor 1 is mounted is not necessarily configured to detect the internal pressure of the mounting body itself like the surge tank 4 described above, and the pressure is detected by the pressure sensor 1 as shown in FIG. You may mount | wear to the mounting body 30 different from the to-be-detected body 32 to be detected. In this case, for example, the pressure introduction pipe 3 and the detection object 32 whose pressure is detected are connected to each other by the hose 31 inside the sensor mounting hole 5. That is, the mounting body 30 to which the pressure sensor 1 is mounted is different from the detected body 32 whose pressure is detected by the pressure sensor 1. And the mounting body 30 is equipped with the snap fitting part 8 in the same way as 1st Embodiment.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a pressure sensor mounting structure according to a first embodiment of the present invention;
(A) is a partial sectional view,
(B) is the top view which looked at Fig.1 (a) from the upper direction.
FIG. 2 is an explanatory diagram showing a process in which a pressure sensor is attached and fixed to a surge tank;
(A) shows the state before fixing of the pressure sensor,
(B) shows the way the pressure sensor is mounted and fixed,
(C) shows after the pressure sensor is mounted and fixed.
FIG. 3 is a perspective view showing a pressure sensor mounting structure according to a second embodiment of the present invention;
(A) shows the state before fixing of the pressure sensor,
(B) shows after the pressure sensor is mounted and fixed.
FIG. 4 is a configuration diagram showing attachment of a pressure sensor to a mounting body different from a detection object.
[Explanation of symbols]
1, 1A Pressure sensor 2, 22 Case 3, 23 Pressure introducing pipe 4, 24 Surge tank (attached body)
4a, 24a External surface 5, 25 Sensor mounting hole 8, 28 Snap fit part 20 Gutter part 21 Guide wall

Claims (1)

A pressure sensor having a case in which components including a pressure detection unit are accommodated, and a pressure introduction pipe projecting outside from the case;
A sensor mounting hole that opens to the outer surface of the mounting body to which the pressure sensor is mounted;
In the pressure sensor mounting structure in which the pressure introducing tube is inserted into the sensor mounting hole,
The mounting body is formed of a resin material, and includes only one snap fit portion formed so as to protrude from the outer surface of the mounting body .
The case is integrally formed with a flange having a shape parallel to the direction in which the pressure introducing tube is inserted into the sensor mounting hole.
A guide wall is provided on the outer surface of the mounting body so as to project and guide the pressure introduction pipe so as to sandwich the flange when the pressure introducing tube is inserted into the sensor mounting hole.
The structure of attaching a pressure sensor, wherein the snap fit portion is attached and fixed to the outer surface by holding the case in a direction in which the pressure introducing tube is inserted into the sensor mounting hole.

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