JP2012255754A - Liquid temperature sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid temperature sensor having a new structure capable of further improving the waterproofness of a case.SOLUTION: External conducting wires 22a and 22b connected to a temperature detection element 12 are inserted into holder-side insertion holes 42 formed in a holder member 30. A water-proof rubber member 28 is provided on one end face 38 of the holder member 30, and the one end face 38 is embedded in a case 16. The external conducting wires 22a and 22b are inserted into rubber-side insertion holes 36 formed in the water-proof rubber member 28. Holding claws 40a, 40b, 40c, and 40d are provided on the holder member 30. The holding claws 40a, 40b, 40c, and 40d hold the water-proof rubber member 28 in such a manner that the water-proof rubber member 28 is closely contacted to the one end face 38 in a compressed state.

Description

  The present invention relates to a liquid temperature sensor in which a temperature detection element for detecting the temperature of a liquid is insert-molded in a case made of synthetic resin.

  Conventionally, a liquid temperature sensor has been used to detect the temperature of a liquid such as an ATF (Automatic Transmission Fluid) or cooling water of an automobile. Such a liquid temperature sensor has a structure in which a temperature detection element such as a thermistor is insert-molded in a synthetic resin case, and an external conductor connected to the temperature detection element is taken out of the case.

  By the way, as described in Japanese Patent Application Laid-Open No. 2005-24344 (Patent Document 1), the external lead wire taken out from the case is prevented from being damaged by being in contact with the mold at the time of insert molding into the case. For this reason, it is insert-molded in the case together with the holder member in a state of being inserted through the insertion hole of the synthetic resin holder member.

  However, in the structure as described in Patent Document 1, it is necessary to make the diameter dimension of the insertion hole of the holder member larger than the diameter dimension of the external conductor so that the external conductor can be inserted. Therefore, a gap is formed between the external conductor and the insertion hole, and oil or water may enter the case through the gap, which may cause erroneous detection of the liquid temperature or short circuit of the electrical circuit in the case. .

Japanese Patent Laid-Open No. 2005-24344

  The present invention has been made in the background of the above-described circumstances, and a problem to be solved is to provide a liquid temperature sensor having a novel structure capable of further improving the waterproofness of the case. .

  In the first aspect of the present invention, the temperature detection element for detecting the liquid temperature is built in the case made of synthetic resin, while the external conductor connected to the temperature detection element is inserted into the holder side insertion hole of the holder member. In the liquid temperature sensor that is insert-molded with the one end surface of the holder member that is open and supported by the holder side insertion hole being embedded in the case, on the one end surface side of the holder member A waterproof rubber member is provided, and an external lead wire extending from the one end surface is inserted into a rubber side insertion hole provided in the waterproof rubber member, while the waterproof rubber member is formed in the holder member The holding claw is in close contact with the one end surface of the holder member and is held in a compressed state.

  According to the liquid temperature sensor having a structure according to the present invention, the waterproof rubber member is disposed in close contact with the one end face side embedded in the case in the holder member. Thereby, the opening part of the one end surface side of a holder side insertion hole can be sealed watertight with a waterproof rubber member. As a result, water or oil can be prevented from entering the case through the holder side insertion hole.

  Further, the waterproof rubber member is held in a compressed state by the holding claws of the holder member. Thereby, the diameter of the rubber side insertion hole can be reduced, and the waterproof rubber member can be brought into close contact with the external conductor without any gap. As a result, it is possible to prevent liquid from entering through the gap between the rubber side insertion hole and the external conductor, and excellent waterproof properties can be obtained.

  The waterproof rubber member is compressed by being held by the holding claws of the holder member. Therefore, in the non-compressed state before being assembled to the holder member, the diameter of the rubber side insertion hole can be made larger than the diameter of the external conductor. In this way, while facilitating the insertion of the external conductor, the waterproof rubber member is assembled to the holder member and compressed and deformed to close the gap between the rubber side insertion hole and the external conductor, thereby exhibiting waterproofness. I can do it. Furthermore, by compressing and deforming the waterproof rubber member, the gap between the rubber side insertion hole and the external conductor is closed, so that the gap between the rubber side insertion hole and the external conductor can be ensured without forming a long rubber side insertion hole. It is possible to reduce the size of the waterproof rubber member.

  In addition, the waterproof rubber member is held by the holder member by the holding claws of the holder member. Thus, when molding the case, the waterproof rubber member can be set in the mold while being held by the holder member, and the position of the waterproof rubber member is shifted relative to the injection pressure of the resin material of the case. Can be prevented. Thereby, the contact | adherence state to the one end surface of the holder member of a waterproof rubber member can be maintained stably, and the outstanding waterproofness can be ensured stably.

  According to a second aspect of the present invention, in the first aspect, the holder member has a pair of holder side insertion holes formed in parallel to each other, and the holder member is formed of the holder side insertion holes. A pair of the rubber side insertion holes are formed in the waterproof rubber member in parallel with each other, and the waterproof rubber member has an axial direction of the rubber side insertion holes and The shape is rotationally symmetric when viewed in a biaxial direction perpendicular to the axial direction passing between the pair of rubber side insertion holes perpendicular to the axial direction.

  The holder member in this aspect has the same shape even when rotated 180 ° in the axial direction of the holder side insertion hole. Therefore, it is not necessary to be aware of the assembly direction of the holder member when the holder side insertion hole is viewed in the axial direction, and the assembly work can be easily performed. Further, the waterproof rubber member has the same shape even when rotated 180 ° as viewed in the axial direction of the rubber side insertion hole, and has the same shape when viewed from any direction in the axial direction of the rubber side insertion hole. ing. Thereby, in addition to the axial view of the rubber-side insertion hole, it is not necessary to be aware of the assembly direction even in the front-rear direction in which the rubber-side insertion hole extends, so that more excellent assembly workability can be obtained.

  According to a third aspect of the present invention, in the one described in the first or second aspect, in the holder member, the four holding claws are formed at positions surrounding four sides of the waterproof rubber member. Is.

  According to this aspect, the waterproof rubber member can be surrounded by the four holding claws from four directions and can be compressed and deformed in a balanced manner. As a result, the waterproof rubber member can be brought into close contact with the external conducting wire in a well-balanced manner from the entire circumferential direction, and the gap with the rubber-side insertion hole can be stably closed over the entire circumference of the external conducting wire.

  According to a fourth aspect of the present invention, in the one according to any one of the first to third aspects, a contact surface of the holding claw to the waterproof rubber member is along an outer peripheral surface of the waterproof rubber member. It is a shape.

  If it does in this way, a waterproof rubber member can be held more stably by making a holding claw follow a waterproof rubber member. In addition, in this aspect, when the holder member is provided with a plurality of holding claws, it is sufficient that at least one of them is shaped along the waterproof rubber member.

  In the present invention, in the holder member provided with the holder side insertion hole through which the external conductor is inserted, the waterproof rubber member is disposed on one end surface side embedded in the case, and the rubber side insertion hole of the waterproof rubber member The holder member is provided with a holding claw, and the waterproof rubber member is held in a compressed state in close contact with the one end surface of the holder member. Thereby, the opening of the one end surface side of the holder side insertion hole can be sealed with the waterproof rubber member. At the same time, by compressing and deforming the waterproof rubber member with the holding claws, the gap between the rubber side insertion hole and the external conductor can be closed. By holding the waterproof rubber member with the holding claws of the holder member, the waterproof rubber member can be prevented from being displaced with respect to the injection pressure of the resin material at the time of molding the case, and the close contact state with the holder member can be stably maintained. It can also be maintained. As a result, excellent waterproof properties can be obtained.

The perspective view of the liquid temperature sensor as one Embodiment of this invention. II-II sectional drawing in FIG. III-III sectional drawing in FIG. IV-IV sectional drawing in FIG. The perspective view of a waterproof rubber member. The perspective view of a holder member. Explanatory drawing for demonstrating the formation process of the liquid temperature sensor shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, FIG. 1 shows an oil temperature sensor 10 as one embodiment according to the liquid temperature sensor of the present invention. The oil temperature sensor 10 in this embodiment is inserted into an automatic transmission of an automobile and detects the temperature of an ATF (Automatic Transmission Fluid) in the transmission. In the oil temperature sensor 10, the thermistor 12 as a temperature detecting element is directly covered with the inner resin portion 14, and the inner resin portion 14 is covered with a case 16 made of synthetic resin, so that the thermistor 12 is covered with the case 16. It has a built-in structure. The inner resin portion 14 is formed by the first insert molding (primary molding), and the case 16 is formed by the second insert molding (secondary molding).

  As the thermistor 12, for example, a conventionally known one such as a glass-enclosed chip thermistor can be appropriately employed, and is connected to the temperature sensing unit 18 for detecting the temperature of a liquid such as water or oil, A pair of lead wires 20a and 20b extending from the warming portion 18 is provided. One lead wire 20 a extends linearly from the temperature sensing portion 18, while the other lead wire 20 b is bent 180 ° after extending from the temperature sensing portion 18. Thereby, the thermistor 12 is U-shaped as a whole, and the lead wire 20a and the lead wire 20b are arranged in parallel.

  Such a thermistor 12 is covered with the inner resin portion 14. The inner resin portion 14 is formed so as to cover the temperature sensitive portion 18 of the thermistor 12 and the portions of the lead wires 20a and 20b on the temperature sensitive portion 18 side with a substantially constant thickness. As a result, the end of each of the lead wires 20a and 20b opposite to the temperature sensing portion 18 is exposed from the inner resin portion 14.

  The ends of the lead wires 20a and 20b exposed from the inner resin portion 14 are connected to the external conductors 22a and 22b. The external conductors 22a and 22b have a structure in which a conductive core wire 24 is covered with an insulating coating 26. In each of the external conductors 22a and 22b, one end portion of the core wire 24 is exposed from the coating 26 and soldered to the end portions of the lead wires 20a and 20b, so that the lead wires 20a and 20b are physically connected. And electrically connected.

  As shown in FIGS. 2 to 4, the external conductors 22 a and 22 b are inserted through the waterproof rubber member 28 and the holder member 30 and taken out of the case 16. FIG. 5 shows the waterproof rubber member 28. The waterproof rubber member 28 is an integrally molded product formed from a rubber elastic body, and a pair of cylindrical portions 32, 32 arranged in parallel are connected to each other by a rectangular block-shaped connecting portion 34. It is said that.

  Cylindrical portions 32 and 32 are formed in a cylindrical shape having the same size, and rubber side insertion holes 36 and 36 are formed through the respective central axes. The rubber side insertion hole 36 extends in a straight line with a constant circular cross-sectional shape. As a result, the waterproof rubber member 28 is formed with a pair of rubber-side insertion holes 36 and 36 extending in parallel with each other. The diameter of the rubber insertion hole 36 is larger than the diameter of the external conductors 22a and 22b in a free state before the waterproof rubber member 28 is assembled to the holder member 30 and compressed. Further, the outer diameter and inner diameter of the cylindrical portion 32 (that is, the diameter of the rubber-side insertion hole 36) are, as is apparent from FIG. 3, the opening edge of the holder-side communication hole 42 of the holder member 30 described later. The outer diameter dimension is larger than the diameter dimension of the holder side insertion hole 42 and the inner diameter dimension (the diameter dimension of the rubber side insertion hole 36) is the diameter of the holder side insertion hole 42 so that the rubber portion of the cylindrical portion 32 overlaps the portion. It is smaller than the dimensions.

  As shown in FIG. 5, the waterproof rubber member 28 has a rotationally symmetric shape having a central axis in the X-axis direction that is the axial direction of the rubber-side insertion holes 36, 36: X1 as a two-fold axis. Further, the waterproof rubber member 28 has a rotationally symmetric shape with the central axis Z1 in the Z-axis direction passing through between the rubber-side insertion holes 36 and 36 orthogonal to the central axis X1 and having two rotation axes Z1. Thus, the waterproof rubber member 28 has the same shape rotated by 180 ° around the central axis: X1 and the same shape rotated by 180 ° around the central axis: Z1. .

  On the other hand, the holder member 30 is shown in FIG. The holder member 30 is an integrally molded product made of synthetic resin. The holder member 30 has a longitudinal rectangular block shape, and a plurality (four in the present embodiment) of holding claws 40a to 40d protrude from one end surface 38 thereof.

  The holder member 30 is provided with a pair of holder-side insertion holes 42, 42. The holder side insertion holes 42 and 42 are through holes having the same size, and are formed in parallel to each other. The holder side insertion holes 42, 42 are formed with a constant circular cross-sectional shape having a larger diameter than the external conductors 22a, 22b. One end of each of the holder-side insertion holes 42 and 42 is opened at one end surface 38.

  Further, holding claws 40 a to 40 d protrude from one end surface 38 of the holder member 30. In the holding claws 40a to 40d, the holding claw 40a and the holding claw 40b have the same shape, and the holding claw 40c and the holding claw 40d have the same shape. The holding claws 40a and 40b have a plate shape protruding from one end face 38, and locking claws 44 and 44 protruding inward in the opposing direction of the holding claws 40a and 40b are formed at the protruding tip portions, respectively. ing. The holding claws 40a and 40b have a substantially isosceles trapezoidal plate shape whose width dimension gradually decreases from the one end surface 38 to the locking claw 44. On the other hand, the holding claws 40c and 40d have a substantially flat plate shape protruding from the one end surface 38 with a substantially constant cross-sectional shape. At both ends in the width direction of the holding claws 40c, 40d, curved surfaces 46, 46 are formed along the outer peripheral surface of the connecting portion between the cylindrical portions 32, 32 and the connecting portion 34 in the waterproof rubber member 28.

  The holding claws 40a and 40b are formed to face both ends of the long side direction of the one end face 38, while the holding claws 40c and 40d are formed at the center between the opposing faces of the holding claws 40a and 40b. It is formed to face both end portions of the end surface 38 in the short side direction. Thus, the four holding claws 40a to 40d are formed in four directions surrounding the holder side insertion holes 42 and 42.

  As shown in FIG. 6, the holder member 30 has a rotationally symmetric shape with a central axis in the X-axis direction that is the axial direction of the holder-side insertion holes 42, 42: X2 as a two-fold axis. Thereby, the holder member 30 is configured such that the shape rotated by 180 ° around the central axis X2 becomes the same shape.

  The external conductive wires 22 a and 22 b are inserted into the rubber-side insertion holes 36 and 36 of the waterproof rubber member 28 and the holder-side insertion holes 42 and 42 of the holder member 30, and the waterproof rubber member 28 is attached to the holding claws of the holder member 30. It inserts between 40a-40d and is clamped by these holding claws 40a-40d. Thus, the waterproof rubber member 28 is disposed on the one end surface 38 side of the holder member 30, and the external conductors 22 a and 22 b extending from the one end surface 38 of the holder member 30 are inserted into the rubber side insertion holes 36 and 36. It is assumed that it is inserted.

  As shown in FIG. 2, the waterproof rubber member 28 is connected to both outer sides in the arrangement direction of the pair of cylindrical portions 32 and 32 (left and right direction in FIG. 2) by holding claws 40a and 40b. The portion 34 is sandwiched between the holding claws 40c and 40d. The curved surfaces 46 and 46 of the holding claws 40 c and 40 d are overlapped along the outer surfaces of both cylindrical portions 32 and 32 of the waterproof rubber member 28. The opposing distance between the holding claw 40a and the holding claw 40b and between the holding claw 40c and the holding claw 40d is slightly smaller than the outer dimensions of the portion of the waterproof rubber member 28 sandwiched between them. Accordingly, the waterproof rubber member 28 is assembled to the holder member 30 in a state where the four sides are surrounded by the holding claws 40a to 40d and compressed from the four directions. As a result, the rubber-side insertion holes 36 and 36 having a diameter larger than that of the external conductors 22a and 22b in the natural state before compression are reduced, and the waterproof rubber member 28 is brought into close contact with the external conductors 22a and 22b. Yes. Further, the waterproof rubber member 28 is slightly compressed even in the extending direction of the rubber side insertion hole 36 (left and right direction in FIG. 3) by being locked by the locking claws 44 and 44 of the holding claws 40a and 40b. It is assembled with. Thereby, the waterproof rubber member 28 is held by the holder member 30 in a state of being in close contact with the one end surface 38 by its own elastic restoring force. The waterproof rubber member 28 is brought into close contact with the opening edge of the holder-side insertion hole 42 on the one end surface 38 side, so that the clearance between the holder-side insertion holes 42 and 42 and the external conductors 22a and 22b on the one end surface 38 is increased. It is sealed with a waterproof rubber member 28.

  The thermistor 12, the external conductors 22 a and 22 b, the waterproof rubber member 28, and the holder member 30 are insert-molded in the case 16. As a result, the entire thermistor 12 is embedded in the case 16. On the other hand, one end surface 38 side of the holder member 30 is embedded in the case 16, and the opposite side of the one end surface 38 is exposed outside the case 16. Then, after the external conductors 22a and 22b are bent at 90 ° in the case 16, they are taken out of the case 16 through the rubber side insertion hole 36 of the waterproof rubber member 28 and the holder side insertion hole 42 of the holder member 30. ing.

  Such an oil temperature sensor 10 is suitably manufactured as follows, for example. First, the thermistor 12 in which the lead wires 20 a and 20 b are connected to the temperature sensing unit 18 is prepared. Then, a mold (not shown) for molding the inner resin portion 14 (primary molding) is prepared, and the thermistor 12 is set in the molding cavity of the mold. Thereafter, a synthetic resin material for forming the inner resin portion 14 is injected into a mold and subjected to insert molding, whereby the inner resin portion 14 is formed using the thermistor 12 as an insert product. In addition, by molding the inner resin portion 14 with the end portion of the lead wires 20a and 20b opposite to the temperature sensing portion 18 exposed outside the cavity, one end portion of the lead wires 20a and 20b becomes the inner resin portion. 14 is exposed.

  Next, external conducting wires 22a and 22b are prepared, and the core wires 24 and 24 are soldered to the ends of the lead wires 20a and 20b exposed from the inner resin portion 14. Subsequently, the waterproof rubber member 28 is prepared by a conventionally known rubber molding method, and the holder member 30 is prepared by a conventionally known resin molding method. The external conductors 22 a and 22 b are inserted into the rubber-side insertion holes 36 and 36 of the waterproof rubber member 28 and then inserted into the holder-side insertion holes 42 and 42 of the holder member 30. Thereafter, the waterproof rubber member 28 is inserted between the holding claws 40 a to 40 d and assembled to the holder member 30. Of course, after the external conductors 22a and 22b are inserted into the waterproof rubber member 28 and the holder member 30 and the waterproof rubber member 28 is fixed to the holder member 30, the external conductors 22a and 22b are soldered to the lead wires 20a and 20b. Also good.

  Subsequently, as shown in FIG. 7, a mold 50 is prepared for molding (secondary molding) the case 16 using the thermistor 12, the external conductors 22a and 22b, the waterproof rubber member 28, and the holder member 30 as inserts. The mold 50 has a divided structure including molds 50a, 50b, and 50c, and defines a molding cavity 52 corresponding to the case 16. The thermistor 12, the external conductors 22a and 22b, the waterproof rubber member 28, and the holder member 30 covered with the inner resin member 14 are set in the molding cavity 52 of the mold 50. The thermistor 12 is positioned in the molding cavity 52 by a positioning pin (not shown) provided in the mold 50, for example. Further, the external conductors 22a and 22b extending from the rubber-side insertion hole 36 of the waterproof rubber member 28 are bent at substantially right angles, and the holder member 30 is sandwiched between the mold 50b and the mold 50c, whereby the external conductor 22a. , 22b is supported by the holder member 30. One end surface 38 side of the holder member 30 is positioned in the molding cavity 52, and the entire waterproof rubber member 28 is positioned in the molding cavity 52, while the side opposite to the one end surface 38 is positioned outside the molding cavity 52. Has been.

  Then, a synthetic resin material for forming the case 16 is injected into the molding cavity 52 from a gate (not shown) and insert molding is performed. By holding the waterproof rubber member 28 with the holding claws 40 a to 40 d of the holder member 30, the close contact state of the waterproof rubber member 28 to the holder member 30 can be maintained against the pressure of injection of the synthetic resin material. Further, by holding the external conductors 22a and 22b between the mold 50b and the mold 50c via the holder member 30, it is possible to avoid the possibility that the external conductors 22a and 22b are damaged by the molds 50b and 50c. . In this way, the oil temperature sensor 10 can be obtained by forming the case 16 using the thermistor 12, the waterproof rubber member 28, the holder member 30 and the like as inserts.

  According to the liquid temperature sensor 10 having such a structure, the waterproof rubber member 28 is in close contact with the one end surface 38 embedded in the case 16 in the holder member 30. As a result, the gap between the holder side insertion hole 42 opened on the one end surface 38 and the external conductors 22a and 22b is sealed with the waterproof rubber member 28, and the oil liquid is prevented from entering the case 16 through the gap. I can do it.

  In particular, the waterproof rubber member 28 is held in a compressed state by the holding claws 40 a to 40 d of the holder member 30. Thereby, by reducing the diameter of the rubber-side insertion holes 36, 36, the gap between the rubber-side insertion holes 36, 36 and the external conductors 22a, 22b can be stably sealed to ensure water tightness. As a result, it is possible to ensure water tightness between the rubber side insertion holes 36 and 36 and the external conductors 22a and 22b without forming the rubber side insertion holes 36 and 36 to be long, and the waterproof rubber member 28. Can be made compact. Further, as in this embodiment, the rubber-side insertion hole 36 can be formed to have a larger diameter than the outer conductors 22a and 22b in an uncompressed state before being assembled to the holder member 30. In this way, the external conductors 22a and 22b are easily inserted into the rubber-side insertion holes 36 and 36, and the rubber-side insertion holes 36 and 36 are reduced in diameter when assembled to the holder member 30, so that the external conductor 22a. , 22b can be brought into close contact with each other at high levels of ease of assembly and waterproofing. In particular, in the present embodiment, the waterproof rubber member 28 is compressed from four directions by the four holding claws 40a to 40d, so that the waterproof rubber member 28 is stably compressed and deformed from substantially the entire circumferential direction. The gaps between the insertion holes 36 and 36 and the external conductors 22a and 22b can be stably sealed over the entire circumference.

  In addition, the waterproof rubber member 28 is held by the holder member 30 by the holding claws 40 a to 40 d of the holder member 30. Thus, when the holder member 30 and the waterproof rubber member 28 are set in the mold 50 and the case 16 is molded, the waterproof rubber member 28 is held by the holder member 30 against the injection pressure of the resin material of the case 16. Misalignment can be suppressed. Thereby, the outstanding water-tightness can be ensured stably. In particular, in the present embodiment, the curved surfaces 46 and 46 are formed on the holding claws 40c and 40d, respectively, and are formed along the outer surface of the waterproof rubber member 28. Therefore, the waterproof rubber member 28 is more stably provided. Can be held. Of course, the contact surfaces of the holding claws 40a and 40b with the waterproof rubber member 28 can be shaped along the outer surface of the waterproof rubber member 28. By doing so, the waterproof rubber member 28 can be made more stable. Can be held.

  Further, since the waterproof rubber member 28 has a rotationally symmetric shape with respect to the central axis X1 (see FIG. 5), the waterproof rubber member 28 is vertically moved (up and down in FIG. 2) when the external conductors 22a and 22b are inserted. Can be easily inserted without distinguishing the pair of rubber side insertion holes 36, 36. Further, since the waterproof rubber member 28 is also rotationally symmetric with respect to the central axis Z1 (see FIG. 5), the external conductors 22a and 22b can be connected to the rubber insertion holes 36 and 36 from any direction. It may be inserted, and the insertion work can be made easier. Similarly, since the holder member 30 has a rotationally symmetrical shape with respect to the central axis X2 (see FIG. 6), the external conductors 22a and 22b can be easily connected without distinguishing the pair of holder side insertion holes 42 and 42. Can be inserted.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, in the embodiment, the waterproof rubber member 28 has a rectangular block shape, the holding claws 40c and 40d are eliminated from the holder member 30 to form only the pair of holding claws 40a and 40b, or the holding claws 40c and 40d are engaged. A pawl 44 may be formed.

  Further, the present invention is not limited to an oil temperature sensor that detects the temperature of an oil liquid, but is a liquid temperature that detects the temperature of various liquids such as a water temperature sensor that detects the temperature of cooling water, for example. Widely applicable to sensors.

10: Oil temperature sensor (liquid temperature sensor), 12: Thermistor (temperature detection element), 14: Inner resin part, 16: Case, 18: Temperature sensing part, 20a, b: Lead wire, 22a, b: External conductor, 28: Waterproof rubber member, 30: Holder member, 36: Rubber side insertion hole, 38: One end surface, 40a to 40d: Holding claw, 42: Holder side insertion hole, 46: Curved surface

Claims (4)

While the temperature detection element for detecting the liquid temperature is built in the case made of synthetic resin, the external conductor connected to the temperature detection element is inserted into and supported by the holder side insertion hole of the holder member, and the In the liquid temperature sensor that is insert-molded in a state where one end surface of the holder member in which the holder side insertion hole opens is embedded in the case,
A waterproof rubber member is disposed on the one end surface side of the holder member, and an external conductor extending from the one end surface is inserted into a rubber side insertion hole provided in the waterproof rubber member, while the waterproof rubber A liquid temperature sensor, wherein a member is held in a compressed state in close contact with the one end surface of the holder member by a holding claw formed on the holder member. The holder member has a pair of holder-side insertion holes formed in parallel to each other, and the holder member has a rotationally symmetric shape when viewed in the axial direction of the holder-side insertion holes. A pair of the rubber side insertion holes are formed in parallel to each other, and the waterproof rubber member is axially passed between the pair of rubber side insertion holes in the axial direction of the rubber side insertion holes and perpendicular to the axial direction. The liquid temperature sensor according to claim 1, wherein the liquid temperature sensor has a rotationally symmetric shape when viewed in two orthogonal directions. The liquid temperature sensor according to claim 1 or 2, wherein in the holder member, the four holding claws are formed at positions surrounding four sides of the waterproof rubber member. The liquid temperature sensor according to any one of claims 1 to 3, wherein a contact surface of the holding claw to the waterproof rubber member has a shape along an outer peripheral surface of the waterproof rubber member.

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