JP5318028B2 - Pressure detector with temperature detection function - Google Patents

Description

  The present invention relates to a pressure detection device with a temperature detection function mainly used for detecting the temperature and pressure of intake and exhaust of an engine, and in particular, the structure of a terminal (signal drawing connection portion of an input / output terminal) that is not easily deformed when a housing is molded. About.

  The conventional technology, for example, as described in Patent Document 1, the temperature sensor output detection terminal located in the temperature detection chamber has a shape with no steps or protrusions in consideration of ease of mold removal after molding. Since the shape was narrowed from the root to the tip, there was a problem that the terminal was bent due to the stress caused by the flow of the resin during molding and pulled in the inner direction of the housing.

  6 is a cross-sectional view from the temperature detection chamber 19 to the pressure introduction hole 10 in the conventional technique as disclosed in Patent Document 1, and FIG. 7 is a cross-sectional view from the temperature detection chamber 19 to the pressure introduction hole 10 in the conventional technique. The fitting state of mold type | mold 13a, 13b, 13c, 13d and terminal (2) 7a, 7b at the time of shape | molding the housing 4 is shown.

  The shape of the terminals (2) 7a and 7b in the temperature detection chamber 19 is narrower toward the tip in consideration of the ease of mold release of the mold 13b. (2) When 7a and 7b are bent, the housing 4 is easily pulled into the inside of the housing 4 (because the terminal tip is not fixed and is a free structure in the example of FIG. 7). In order to prevent this, it is necessary to make the terminals (2) 7a and 7b thick to ensure rigidity, and it is difficult to reduce the size.

JP 2007-132745 A

  The pressure detection device with a temperature detection function in the prior art is strongly required to be miniaturized because it is attached to an intake pipe of an engine having many layout restrictions. However, in the prior art, the terminal located in the temperature detection chamber of the temperature sensor output detection terminal is bent by the stress caused by the resin flow during molding, and the terminal is not used for the problem of being pulled inward of the housing. Thicken to ensure rigidity, or before molding the housing, it is necessary to form the housing body again after securing the rigidity by molding and temporarily fixing only the terminal part once with resin, avoiding an increase in man-hours However, it has been a problem in manufacturing an inexpensive and small pressure detection device with a temperature detection function.

  The purpose of the present invention is to efficiently fix the temperature sensor output detection terminal and prevent deformation of the terminal during molding of the housing, so that the terminal is thin and optimally arranged, and the pressure detection with a temperature detection function is small and inexpensive. To provide an apparatus.

In order to solve the above problems, the present invention mainly adopts the following configuration.
A pressure sensor that converts the pressure of the medium to be measured into an electrical signal, a temperature sensor that converts the temperature of the medium to be measured into an electrical signal, a terminal for drawing out the output of the temperature sensor and the pressure sensor, and connecting to the outside; A pressure introduction hole for guiding the pressure to the pressure sensor, and a housing formed by a mold so as to form a temperature detection chamber in which the temperature sensor is disposed, and the output detection terminal of the temperature sensor includes the pressure sensor Between the temperature detection chamber and the pressure introduction hole, the temperature sensor output detection terminal is arranged on both sides of the introduction hole so as to sandwich the introduction hole in the direction of the pressure introduction hole and the direction of the pressure introduction hole. inside the opposite has a convex portion and / or stepped shape outwardly of the inner peripheral surface of the convex portion and / or the step in the direction of the pressure introducing hole is the pressure introducing hole A structure to be exposed.

A pressure sensor for converting the pressure of the medium to be measured into an electric signal; a temperature sensor for converting the temperature of the medium to be measured into an electric signal; and a terminal for externally connecting the temperature sensor and the output of the pressure sensor. A pressure introduction hole for guiding the pressure to the pressure sensor, and a housing formed by a mold so as to form a temperature detection chamber in which the temperature sensor is disposed, and an output detection terminal of the temperature sensor includes: The pressure detection holes are arranged on both sides of the pressure introduction hole so that the output detection terminal of the temperature sensor is in the vicinity of and between the temperature detection chamber and the pressure introduction hole in the direction of the pressure introduction hole and the pressure introduction hole. direction and have opposite-side protrusion and / or stepped shape outward in the direction of the pressure introducing hole, and the opposite side of the outer direction of the the direction of the pressure introducing hole Parts and / or steps are said mold in contact during the molding of the housing, for output detection terminals of the temperature sensor is X, Y, and configured to be fixed in three directions of the Z-axis.

  According to the present invention, when the housing is molded, the temperature sensor output detection terminal located in the temperature detection chamber is securely fixed by the mold, so even if stress due to the resin flow during molding occurs, the terminal is located inside the housing. Pulling in can be prevented, and as a result, the terminal can be made thin, and the size can be reduced without increasing the number of manufacturing steps.

It is sectional drawing of the terminal for temperature sensor output detection in the pressure detection apparatus with a temperature detection function which concerns on embodiment of this invention. It is sectional drawing which shows the whole structure of the pressure detection apparatus with a temperature detection mechanism which concerns on this embodiment, and the attachment structure to to-be-detected piping. It is sectional drawing which shows the housing and terminal of the pressure detection apparatus with a temperature detection mechanism which concern on this embodiment. It is sectional drawing at the time of mold fitting at the time of housing shaping | molding of the pressure detection apparatus with a temperature detection mechanism which concerns on this embodiment. It is an expanded sectional view of the terminal for temperature sensor output detection at the time of mold fitting at the time of housing molding of the pressure detection device with a temperature detection mechanism concerning this embodiment. It is sectional drawing which shows the terminal for temperature sensor output detection in the pressure detection apparatus with a temperature detection function regarding a prior art. It is sectional drawing at the time of mold fitting at the time of housing shaping | molding of the pressure detection apparatus with a temperature detection function regarding a prior art.

  A pressure detection device with a temperature detection function according to an embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a cross-sectional view of the main part of a pressure detection device with a temperature detection function, and FIG.

  As shown in FIG. 2, the housing 4 is made of a resin material such as PBT (Polybutylene sulfate) or PPS (Polyphenylene sulfide), and is a terminal for electrically taking out the outputs of the pressure sensor 2 and the temperature sensor 3 and connecting them to the outside. (1) 6 and terminal (2) 7 are insert-molded, and a pressure introduction hole 10 for guiding pressure and a temperature detection chamber 19 for protecting the temperature sensor 3 are formed.

  Usually, in the terminal (connection terminal portion for taking out the sensor output and connecting to the outside), the terminal (1) 6 of the pressure sensor 2 device with the temperature sensor 3 has four terminals, that is, for the pressure sensor, A temperature sensor, a power supply, and a ground are provided. There is a temperature sensor 3 in the temperature detection chamber 19, and the temperature sensor lead 8 and the terminal (2) 7 are electrically connected by welding.

  Further, after mounting the pressure sensor 2 on the upper opening of the housing 4 and electrically connecting with the terminal (1) 6 by welding, the opening is sealed and cured with a sealing material 5 made of epoxy resin to be airtight. As well as securing the pressure sensor 2, the pressure detection device 1 with a temperature detection function is configured. A hole for mounting the pressure detection device 1 with a temperature detection function is provided in the detected pipe 11, and airtightness is secured by the O-ring 9.

  As shown in FIG. 1, terminals (2) 7 a and 7 b for drawing out the output of the temperature sensor 3 are arranged so as to sandwich the pressure introduction hole 10, and the temperature sensor lead 8 and the terminal ( 2) 7a and 7b are electrically connected by welding.

  As a feature of the present embodiment, a fixing projection (convex portion) 15a is provided on a part of the terminals (2) 7a and 7b on the pressure introduction hole 10 side, and further fixed to a part on the opposite side of the fixing protrusion 15a. 1 is provided with protrusions (convex portions) or steps 15b (in the illustrated example of FIG. 1, both terminals 15a and 15b of the terminal (2) 7b have a protruding shape, and terminals 15a of the terminal (2) 7a have a protruding shape. 2) 15a of 7a has a stepped shape), and the fixing projections 15a and 15b are fixed by a mold when the housing 4 is molded, so that the terminal (2) 7a, It is possible to prevent 7b from being drawn into the inside of the housing 4 (because the lower tip portion of the terminal has a free structure, it is drawn upward in the structure shown in FIG. 1).

  Next, the pressure detection device with a temperature detection mechanism according to the present embodiment will be described in more detail with reference to FIGS. In FIG. 3, the terminal (2) 7 is embedded in the resin of the housing 4 in parallel with the pressure introducing hole 10, and is bent by the stress caused by the flow of the resin during molding, and is drawn into the housing 4 (FIG. 3). 5), there is a problem of fixing the temperature detection chamber 19 in the vicinity (means for preventing the terminal (2) 7 from being pulled upward in FIG. 5). Necessary.

  (1) in FIG. 4 shows a portion surrounded by H in FIG. 3 in order to show the fitting state of the mold dies 13a, 13b, 13c, 13d and the terminals (2) 7a, 7b when the housing 4 is molded. It is sectional drawing seen from the G direction, (2) of FIG. 4 shows the K section cross section shown to (1) of FIG.

  The mold 13 in the H part shown in (1) of FIG. 4 includes a mold 13a for forming the pressure introducing hole 10, a mold 13b for forming the temperature detection chamber 19, and an outer periphery. Mold molds 13c and 13d (13c and 13d are mold molds in which half of the circumference is abutted) are formed, and the mold mold 13b for forming the temperature detection chamber 19 has a terminal tip. Mold die relief 14 for escaping the terminals (2) 7a and 7b including the bend (the central portion of the mold die 13b shown in FIGS. 4 (1) and (2) is cut out to form a hollow portion of an elongated rectangular column. Escape part) is provided.

  The terminals (2) 7a and 7b are fixed in the X-axis direction (see (2) in FIG. 4) by the wall surfaces indicated by 16a, 16b, 16c and 16d of the mold die escape portion 14. Further, since the tip end portion (the upper end portion in FIG. 4 (1)) extends near the bottom surface of the mold 13a, the step 15b of the terminal (2) 7a (see FIGS. 1 and 5). ) Is also fixed by the escape portion 14 at a height position similar to that of fixing the terminal in the Y-axis direction and the Z-axis direction, which will be described later.

  Next, a method of fixing the terminals (2) 7a and 7b in the Y-axis and Z-axis directions will be described with reference to FIG. FIG. 5 is a detailed view of a portion surrounded by J in FIG. The terminals (2) 7a and 7b are fixed in the Y-axis direction on the surface of terminals (2) 17a, 17b, 17c and 17d, and the Z-axis direction is fixed to the terminal (2) 18a. , 18b, 18c, 18d are fixed to the mold.

  Thus, by fixing the fixing protrusions or steps 15a, 15b of the terminals (2) 7a, 7b with the mold 13, the terminals (2) 7a, 7b are brought into the housing 4 by the resin stress when the housing 4 is molded. Since it can be prevented from being pulled in, the terminals (2) 7a and 7b can be thinned and miniaturized.

DESCRIPTION OF SYMBOLS 1 Pressure detection apparatus with temperature detection function 2 Pressure sensor 3 Temperature sensor 4 Housing 5 Sealing resin 6 Terminal (1)
7, 7a, 7b Terminal (2)
8 Temperature sensor lead 9 O-ring 10 Pressure introducing hole 11 Pipe to be detected 12 Flow of medium to be detected 13, 13a, 13b, 13c, 13d Mold die 14 Mold die relief 15a, 15b Fixing protrusions 16a, 16b, 16c, 16d Terminal X direction fixed surface 17a, 17b, 17c, 17d Terminal Y direction fixed surface 18a, 18b, 18c, 18d Terminal Z direction fixed surface 19 Temperature detection chamber

Claims (3)

A pressure sensor that converts the pressure of the medium to be measured into an electrical signal, a temperature sensor that converts the temperature of the medium to be measured into an electrical signal, a terminal for drawing out the output of the temperature sensor and the pressure sensor, and connecting to the outside; A pressure introduction hole for guiding the pressure to the pressure sensor, and a housing formed by a mold so as to form a temperature detection chamber in which the temperature sensor is disposed,
The temperature sensor output detection terminals are arranged on both sides of the pressure introduction hole,
An output detection terminal of the temperature sensor between and near the temperature detection chamber and the pressure introduction hole has a convex portion and / or an outward direction in the direction of the pressure introduction hole and opposite to the direction of the pressure introduction hole. Or having a stepped shape,
The pressure detecting device with a temperature detecting function , wherein the convex portion and / or the step in the direction of the pressure introducing hole are exposed to the inner side of the inner peripheral surface of the pressure introducing hole. A pressure sensor that converts the pressure of the medium to be measured into an electrical signal, a temperature sensor that converts the temperature of the medium to be measured into an electrical signal, a terminal for drawing out the output of the temperature sensor and the pressure sensor, and connecting to the outside; A pressure introduction hole for guiding the pressure to the pressure sensor, and a housing formed by a mold so as to form a temperature detection chamber in which the temperature sensor is disposed,
The temperature sensor output detection terminals are arranged on both sides of the pressure introduction hole,
An output detection terminal of the temperature sensor between and near the temperature detection chamber and the pressure introduction hole has a convex portion and / or an outward direction in the direction of the pressure introduction hole and opposite to the direction of the pressure introduction hole. Or having a stepped shape,
The convex portion and / or the step in the direction of the pressure introduction hole and the outer side opposite to the direction of the pressure introduction hole abuts on the mold during molding of the housing, and the output detection terminal of the temperature sensor Is fixed in three directions of the X, Y, and Z axes. A pressure detection device with a temperature detection function. In claim 1 or 2,
The mold includes a mold for forming the pressure introducing hole, a mold for forming the temperature detection chamber, and a mold for forming the outer periphery of the housing. A pressure detector with a temperature detection feature.

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