Physical quantity detection device

Abstract

The present application provides a physical quantity detection device that can reduce manufacturing cost compared to a case where a physical quantity sensor that detects a physical quantity and an electric wire that is an object of detection are buried in a molded member. A physical quantity detection device (1) is provided with a first holding member (2) and a second holding member (3) disposed with a first electric wire (61) to a third electric wire (63) interposed therebetween, and a temperature sensor (4) fixed with respect to the first electric wire (61) to the third electric wire (63) by the first holding member (2) and the second holding member (3). The first holding member (2) and the second holding member (3) are fixed with respect to the first electric wire (61) to the third electric wire (63) by being engaged with each other.

Description

Technical Field

[0001] This invention relates to a physical quantity detection device for detecting the physical quantities of electrical wires. Background Technology

[0002] Currently, in order to prevent damage to rotating motors such as electric motors and generators due to overheating, temperature sensors are used to detect the temperature of the rotating motor. The rotating motor described in Patent Document 1 has an embedded temperature detection unit, which is formed by embedding a temperature sensor with a built-in temperature detection element such as a thermistor and the neutral wire of the rotating motor into a molded part.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent No. 5621810 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] In the manufacturing of the rotary motor described in Patent Document 1, an insert molding process is required, in which the temperature sensor and the neutral line of the rotary motor are arranged together in a metal mold, and molten resin is injected into the cavity of the metal mold to form the molded part. Compared with the case of manufacturing resin components by injection molding, which is not insert molding, this process takes more time and increases costs, thus hindering the reduction of manufacturing costs.

[0008] Therefore, the object of the present invention is to provide a physical quantity detection device that can reduce manufacturing costs compared to embedding a physical quantity sensor and the wire of the object to be detected together into a molded part.

[0009] Solution for solving the problem

[0010] To address the aforementioned issues, the present invention provides a physical quantity detection device comprising a first holding member and a second holding member disposed across a wire, and a physical quantity sensor fixed relative to the wire by means of the first holding member and the second holding member. The physical quantity sensor is used to detect physical quantities of the wire, wherein the first holding member and the second holding member are fixed relative to the wire by mutual locking.

[0011] The effects of the invention are as follows.

[0012] The physical quantity detection device according to the present invention can reduce manufacturing costs compared to embedding the physical quantity sensor and the wire of the object to be detected together into the molded part. Attached Figure Description

[0013] Figure 1 (a) and (b) are perspective views of the physical quantity detection device of the first embodiment of the present invention as viewed from different directions.

[0014] Figure 2 From Figure 1 An exploded perspective view of the physical quantity detection device observed in the direction shown in (a).

[0015] Figure 3 From Figure 1 An exploded perspective view of the physical quantity detection device observed in the direction shown in (b).

[0016] Figure 4 This is a perspective view showing the first to third wires and the first and second spacers disposed between the first to third wires.

[0017] Figure 5 This is a three-dimensional view showing the interior of a temperature sensor.

[0018] Figure 6 This is a cross-sectional view of a physical quantity detection device.

[0019] Figure 7 (a) to (c) are explanatory diagrams showing the assembly sequence of the physical quantity detection device.

[0020] Figure 8 (a) and (b) are perspective views showing the first retainer of the second embodiment.

[0021] Figure 9 This is a cross-sectional view of the physical quantity detection device according to the second embodiment.

[0022] Figure 10 This is an exploded perspective view of the physical quantity detection device according to the third embodiment.

[0023] Figure 11 This is an exploded perspective view of the physical quantity detection device according to the third embodiment.

[0024] Figure 12 This is a cross-sectional view of the physical quantity detection device according to the third embodiment.

[0025] Figure 13 This is a perspective view showing the first retaining member of the fourth embodiment.

[0026] Figure 14 This is a cross-sectional view of the physical quantity detection device according to the fourth embodiment.

[0027] Figure 15 This is a perspective view showing the physical quantity detection device according to the fifth embodiment.

[0028] Figure 16This is an exploded perspective view of the physical quantity detection device according to the fifth embodiment.

[0029] Figure 17 This is an exploded perspective view of the physical quantity detection device according to the fifth embodiment.

[0030] Figure 18 This is a perspective view showing the first to third wires and spacers of the physical quantity detection device according to the fifth embodiment.

[0031] Figure 19 This is a cross-sectional view of the physical quantity detection device according to the fifth embodiment.

[0032] Symbol Explanation

[0033] 1. 1A~1D—Physical quantity detection device; 2. 2A~2C, 8—First holding member; 20—Holding space; 201—Outlet window; 241~244—Arm; 3. 3D—Second holding member; 4—Temperature sensor (physical quantity sensor); 41—Thermistor (detection part); 451, 452—Signal lines; 5—Sensor bracket; 50, 80—Holding space; 501—Outlet window; 51, 52—Catching protrusions; 53—Opposing wall; 53a—Opposing surface; 53b—Inner surface; 530a, 530b, 530c—Concave surface; 61~63—First to third wires; 71—First spacer; 72—Second spacer; 81—Clamping wall; 81a—Opposing surface; 810a, 810b, 810c—Concave surface. Detailed Implementation

[0034] [First Implementation Method]

[0035] Reference Figures 1 to 7 The first embodiment of the present invention will be described.

[0036] Figure 1 (a) and (b) are perspective views of the physical quantity detection device of the first embodiment of the present invention as viewed from different directions. Figure 2 From Figure 1 An exploded perspective view of the physical quantity detection device observed in the direction shown in (a). Figure 3 From Figure 1 An exploded perspective view of the physical quantity detection device observed in the direction shown in (b). Figure 4 This is a perspective view showing the first to third wires and the first and second spacers disposed between the first to third wires. Figure 5 This is a three-dimensional view showing the interior of a temperature sensor. Figure 6 This is a cross-sectional view of a physical quantity detection device.

[0037] The physical quantity detection device 1 takes the first wire 61 to the third wire 63 as the detection object and detects the physical quantity of the first wire 61 to the third wire 63. In this embodiment, the case of detecting the temperature of the first wire 61 to the third wire 63 as the physical quantity is described, but it is not limited to this. For example, the strength of the magnetic field generated by the current flowing through the first wire 61 to the third wire 63 can also be detected.

[0038] The first wire 61 to the third wire 63 are respectively connected to the three-phase windings of the rotating motor. The rotating motor is, for example, a motor that uses the magnetic field generated by the three-phase alternating current in the stator to rotate the rotor, or a generator that generates three-phase alternating current by the rotation of the rotor, or an electric generator that combines the functions of a motor and a generator.

[0039] like Figure 6 As shown in the cross-section, the first wire 61 to the third wire 63 are insulated wires consisting of conductors 611, 621, and 631 with good conductivity, such as copper, covered by coating layers 612, 622, and 632 made of insulating resin such as enamel. Furthermore, in this embodiment, the first wire 61 to the third wire 63 are circular single wires with a circular cross-section, but this is not a limitation; for example, the first wire 61 to the third wire 63 may also be flat wires with a rectangular cross-section.

[0040] The first wire 61 to the third wire 63 are arranged side by side via a first spacer 71 and a second spacer 72 made of resin. The first spacer 71 is disposed between the first wire 61 and the second wire 62, and the second spacer 72 is disposed between the second wire 62 and the third wire 63.

[0041] like Figure 4 As shown, the first spacer 71 integrally comprises: a flat plate portion 711 extending parallel to the first wire 61 and the second wire 62; and a pair of retaining portions 712, 713, which are separately disposed along the length of the plate portion 711. Recesses 712a, 713a for receiving a portion of the first wire 61 and recesses 712b, 713b for receiving a portion of the second wire 62 are respectively formed in the pair of retaining portions 712, 713.

[0042] Similarly, the second spacer 72 integrally includes: a flat plate portion 721 extending parallel to the second wire 62 and the third wire 63; and a pair of retaining portions 722, 723, which are separately provided in the longitudinal direction of the plate portion 721. Recesses 722a, 723a for receiving a portion of the second wire 62 and recesses 722b, 723b for receiving a portion of the third wire 63 are respectively formed in the pair of retaining portions 722, 723.

[0043] Furthermore, the first spacer 71 has engaging protrusions 714 and 715 that protrude from the plate portion 711 in a direction perpendicular to the arrangement direction of the first wire 61 and the second wire 62. Similarly, the second spacer 72 has engaging protrusion 724 that protrudes from the plate portion 721 in a direction perpendicular to the arrangement direction of the second wire 62 and the third wire 63.

[0044] Two engaging protrusions 714 and 715 are provided between the first spacer 71 and a pair of retaining portions 712 and 713. An engaging protrusion 724 is provided between the second spacer 72 and a pair of retaining portions 722 and 723. The engaging protrusions 714, 715, and 724 are used for relative positioning and fixation with the second retaining member 3 of the physical quantity detection device 1 described below.

[0045] The physical quantity detection device 1 includes: a first holding member 2 and a second holding member 3, which are disposed across a first wire 61 to a third wire 63; a temperature sensor 4, which serves as a physical quantity sensor, is fixed relative to the first wire 61 to the third wire 63 by means of the first holding member 2 and the second holding member 3; and a sensor bracket 5, which forms a holding space 50 for holding the temperature sensor 4. The first wire 61 to the third wire 63 are disposed parallel to each other between the first holding member 2 and the second holding member 3. The first holding member 2, the second holding member 3, and the sensor bracket 5 are monomeric resin components formed by injection molding, which is not an insert molding process. Furthermore, as the resin material of the sensor bracket 5, in order to improve the temperature detection accuracy, a material with high thermal conductivity of 1 W / m·K or higher is preferably used, and a material with thermal conductivity of 3 W / m·K or higher is more preferably used.

[0046] The physical quantity detection device 1 uses temperature sensor 4 to detect the temperature of the first wire 61 to the third wire 63. For example... Figure 5 and Figure 6 As shown, the temperature sensor 4 includes: a thermistor 41 as a detection unit that converts a physical quantity (temperature in this embodiment) into an electrical signal; a housing member 42 that houses the thermistor 41; a holding member 43 that is housed in the housing member 42; and a pair of signal lines 441, 442 that are led out from the housing member 42.

[0047] The housing component 42 is a bottomed cylindrical molded body made of injection-molded resin. A filler 46 is filled inside the housing component 42. The filler 46 is, for example, epoxy resin. Hereinafter, the housing component 42 and the parts housed within it (thermistor 41, retaining member 43, filler 46, and a portion of signal lines 441 and 442) will be referred to as the main body 40 of the temperature sensor 4.

[0048] Thermistor 41 has a metal oxide sintered body 411 (refer to) that serves as a sensing element whose resistance changes with temperature. Figure 6 The metal oxide sintered body 411 includes a pair of leads 412 and 413 connected to the metal oxide sintered body 411, and a sealing material 414 for sealing the metal oxide sintered body 411. The sealing material 414 is, for example, a glass sealing material, and is formed in an ellipsoidal shape.

[0049] One end of each of the pair of leads 412 and 413 is connected to the metal oxide sintered body 411 within the sealing material 414. The other end of each of the pair of leads 412 and 413 is connected to a pair of signal lines 441 and 442 outside the sealing material 414. The signal lines 441 and 442 are, for example, insulated wires consisting of stranded wires 441a and 442a made of multiple strands, covered by insulators 441b and 442b made of resin.

[0050] A pair of leads 412 and 413 and a pair of signal lines 441 and 442 constitute signal lines 451 and 452 for transmitting the electrical signal output from the thermistor 41. Signal lines 451 and 452 transmit this electrical signal, for example, to a control device that controls the rotating motor. When the detected temperature is higher than a predetermined value, the control device suppresses the current flowing to the rotating motor to prevent damage due to overheating.

[0051] like Figure 3 As shown, the sensor bracket 5 is provided with a lead-out window 501 for leading out signal lines 441 and 442 from the holding space 50, and a pair of locking protrusions 51 and 52 to prevent the housing component 42 of the temperature sensor 4 from dislodging from the lead-out window 501. In this embodiment, the lead-out window 501 is disposed between the pair of locking protrusions 51 and 52. The signal lines 441 and 442 are led out from the lead-out window 501 along the arrangement direction of the first wire 61 to the third wire 63.

[0052] Furthermore, the sensor holder 5 has an opening 502 that opens toward the first retainer 2, and this opening 502 is closed by the first retainer 2. The housing component 42 of the temperature sensor 4 is held in the retaining space 50 of the sensor holder 5 in a manner that utilizes the first retainer 2 without dislodging from the opening 502.

[0053] The sensor bracket 5 integrally comprises: an opposing wall 53, which is opposed to the first wire 61 to the third wire 63; a pair of side walls 54, 55, which are opposite each other across the holding space 50 and parallel to the axial direction of the first wire 61 to the third wire 63; and a bottom wall 56, which closes the holding space 50 on the opposite side of the outlet window 501. The housing component 42 of the temperature sensor 4 is surrounded from three directions by the opposing wall 53 and the pair of side walls 54, 55.

[0054] A pair of locking protrusions 51 and 52 are provided at the ends of a pair of sidewalls 54 and 55. A locking protrusion 57 is provided on the bottom wall 56, protruding in a direction perpendicular to the arrangement direction of the first wire 61 to the third wire 63. The locking protrusion 57 is erected on the opposing surface 56a of the bottom wall 56, which is opposite to the first retainer 2.

[0055] An engaging recess 210 is formed on the outer wall 21 of the first retainer 2, where an engaging protrusion 57 engages. The sensor bracket 5 is restricted from relative movement with respect to the first retainer 2 in the arrangement direction of the first wire 61 to the third wire 63 by engaging the engaging protrusion 57 with the engaging recess 210.

[0056] On the opposing surface 53a of the opposing wall 53 of the sensor holder 5, which faces the first wire 61 to the third wire 63, concave surfaces 530a, 530b, and 530c are formed, recessed along the outer peripheral surfaces of each of the first wire 61 to the third wire 63. When viewed axially from the first wire 61 to the third wire 63, the curvature of the concave surfaces 530a, 530b, and 530c is the same as, or slightly larger than, the curvature of the outer peripheral surfaces of the first wire 61 to the third wire 63. Utilizing the shape of the sensor holder 5 with these concave surfaces 530a, 530b, and 530c, heat from the first wire 61 to the third wire 63 is easily transferred to the temperature sensor 4 via the sensor holder 5.

[0057] Furthermore, the opposing wall 53 has a first engaging groove 531 for engaging the plate portion 711 of the first spacer 71 and a second engaging groove 532 for engaging the plate portion 721 of the second spacer 72. The plate portion 711 of the first spacer 71 engages with the first engaging groove 531 between a pair of retaining portions 712 and 713. The plate portion 721 of the second spacer 72 engages with the second engaging groove 532 between a pair of retaining portions 722 and 723.

[0058] Temperature sensor 4 and sensor bracket 5 are disposed between first retainer 2 and first wire 61 to third wire 63. Temperature sensor 4 is fixed relative to first wire 61 to third wire 63 by interlocking first retainer 2 and second retainer 3.

[0059] The first retainer 2 integrally includes: an outer wall 21 that blocks the opening 502 of the retaining space 50 of the sensor bracket 5; a pair of transverse walls 22 and 23 that are respectively opposed to a pair of side walls 54 and 55 of the sensor bracket 5; a plurality of arms 241 to 244 that extend from the first wire 61 to the third wire 63 and from the pair of transverse walls 22 and 23 toward the second retainer 3; and engaging protrusions 251 to 254 that are provided at the front end of each of the plurality of arms 241 to 244.

[0060] In this embodiment, the first retainer 2 has four arms 241 to 244, wherein two arms 241 and 243 extend from one of the transverse walls 22 and 23 toward the second retainer 3. The other two arms 242 and 244 extend from the other of the transverse walls 22 and 23 toward the second retainer 3.

[0061] The second retainer 3 is generally rectangular in shape, with its longer portion extending along the arrangement direction of the first wire 61 to the third wire 63. Multiple engaging recesses 311 to 314 are formed at both ends along its length. These engaging recesses 311 to 314 engage with engaging protrusions 251 to 254 of the first retainer 2, respectively. Through the engagement of the engaging recesses 311 to 314 with the engaging protrusions 251 to 254, the first retainer 2 and the second retainer 3 are mutually engaged across the first wire 61 to the third wire 63 and the temperature sensor 4, thereby being fixed relative to the first wire 61 to the third wire 63.

[0062] Furthermore, the second retaining member 3 has engaging recesses 321 to 323 that engage with the engaging protrusions 714 and 715 of the first spacer 71 and the engaging protrusion 724 of the second spacer 72, respectively. The second retaining member 3 is positioned relative to the first wire 61 to the third wire 63 by engaging the engaging protrusions 714, 715, and 724 of the first spacer 71 and the second spacer 72 with the engaging recesses 321 to 323.

[0063] Figure 7 Figures (a) to (c) are explanatory diagrams showing the assembly sequence of the physical quantity detection device 1. The physical quantity detection device 1 is assembled via... Figure 7 As shown in (a) to (c), the first to third steps are used for assembly. In the first step, as... Figure 7 As shown in (a), the main body 40 of the temperature sensor 4 is housed in the holding space 50 through the opening 502 of the sensor holder 5. In the second step, as... Figure 7 As shown in (b), the sensor bracket 5, which houses the temperature sensor 4, is positioned between a pair of transverse walls 22 and 23 of the first retainer 2, such that the engaging protrusion 57 of the sensor bracket 5 engages with the engaging recess 210 of the first retainer 2. Thus, an assembly 10 consisting of the first retainer 2, the temperature sensor 4, and the sensor bracket 5 is formed (see Figure 10). Figure 7 (c)).

[0064] In the third step, such as Figure 7As shown in (c), the engaging protrusions 714, 715, and 724 of the first spacer 71 and the second spacer 72 engage with the engaging recesses 321 to 323 of the second retainer 3, and the first wire 61 to the third wire 63 are clamped between the assembly 10 and the second retainer 3, and the engaging protrusions 251 to 254 of the first retainer 2 engage with the engaging recesses 311 to 314 of the second retainer 3. Thus, the physical quantity detection device 1 is assembled.

[0065] According to the first embodiment of the present invention described above, the physical quantity detection device 1 can be manufactured without an embedding molding process, thus reducing manufacturing costs. Furthermore, by making the size of the holding space 50 of the sensor holder 5 conform to a commercially available temperature sensor 4, the cost can be further reduced by using a commercially available temperature sensor 4 (a standard product from a sensor manufacturer). Moreover, the same effect can be obtained even by modifying the first embodiment as follows.

[0066] In the first embodiment, it was described that the first retainer 2 has four arms 241 to 244 and the engaging protrusions 251 to 254 provided at the front ends of the arms 241 to 244 engage with the engaging recesses 311 to 314 of the second retainer 3, respectively. However, it is also possible to provide multiple arms in the second retainer so that the engaging protrusions provided at the front ends of the arms engage with the engaging recesses formed in the first retainer, thereby locking the first retainer and the second retainer together.

[0067] Furthermore, in the first embodiment, the engagement protrusions 714, 715, and 724 of the first spacer 71 and the second spacer 72 are described as engaging with the engagement recesses 321 to 323 of the second retainer 3. However, it is also possible for the engagement protrusions provided on at least one of the first and second spacers to engage with the engagement recesses formed on the first retainer or the sensor bracket 5. In this case, the second retainer 3 may not necessarily engage with the first spacer 71 and the second spacer 72.

[0068] Furthermore, the relationship between the engaging protrusion and the engaging recess in the first embodiment can also be reversed. For example, an engaging recess can be formed at the front end of the arm of the first retainer, so that the engaging protrusion provided on the second retainer engages with the engaging recess. The engagement relationship between the first retainer 2 and the sensor bracket 5, and the engagement relationship between the second retainer 3 and the first spacer 71 and the second spacer 72, are also the same.

[0069] [Second Implementation]

[0070] Next, refer to Figure 8 and Figure 9 The physical quantity detection device 1A of the second embodiment will be described.

[0071] Figure 8 (a) and (b) are perspective views showing the first retainer 2A of the second embodiment. Figure 9 This is a cross-sectional view of the physical quantity detection device 1A according to the second embodiment. Figure 8 and Figure 9 In this document, for constituent elements that are common to the constituent elements described in the first embodiment, the same as those in the document are marked as such. Figures 1 to 7 The same symbols are marked in the text, and repeated descriptions are omitted.

[0072] In the physical quantity detection device 1A of this embodiment, the inner surface of the first wire 61 to the third wire 63 side facing the holding space 50, specifically the inner surface 53b of the holding space 50 side of the opposing wall 53 of the sensor bracket 5, elastically presses the housing component 42 of the temperature sensor 4. This structure is different from that of the first embodiment.

[0073] In this embodiment, an elastic portion 211 for pressing the housing component 42 of the temperature sensor 4 is provided on the outer wall 21 of the first retainer 2A. The elastic portion 211 is a tongue-shaped portion of the outer wall 21 that protrudes toward the retaining space 50. The side 42b of the housing component 42 of the temperature sensor 4, opposite to the contact surface 42a that abuts against the elastic portion 211, is in close contact with the inner surface 53b of the opposing wall 53 of the sensor bracket 5 without gap. As a result, heat from the first wire 61 to the third wire 63 can be easily transferred from the sensor bracket 5 to the housing component 42.

[0074] According to this second embodiment, the same effect as the first embodiment can be obtained, and since the heat of the first wire 61 to the third wire 63 is easily transferred to the housing component 42 of the temperature sensor 4, the detection accuracy of the temperature of the first wire 61 to the third wire 63 can be improved.

[0075] [Third Implementation Method]

[0076] Next, refer to Figures 10 to 12 The physical quantity detection device 1B of the third embodiment will be described.

[0077] Figure 10 and Figure 11 This is an exploded perspective view of the physical quantity detection device 1B according to the third embodiment. Figure 12 This is a cross-sectional view of the physical quantity detection device 1B according to the third embodiment. Figures 10 to 12 In this document, for constituent elements that are common to the constituent elements described in the first embodiment, the same as those in the document are marked as such. Figures 1 to 7 The same symbols are marked in the text, and repeated descriptions are omitted.

[0078] The physical quantity detection device 1B of this embodiment does not have a sensor bracket 5, and a holding space 20 for holding the temperature sensor 4 is formed in the first holding member 2B. The holding space 20 opens toward the first wire 61 to the third wire 63, and the housing member 42 of the temperature sensor 4 is opposite to the first wire 61 to the third wire 63.

[0079] The first retainer 2B has an outlet window 201 for the signal lines 441, 442 of the temperature sensor 4 to be routed out from the retaining space 20. Furthermore, the first retainer 2B has locking protrusions 26, 27 to prevent the housing component 42 from dislodging from the outlet window 201, and a bottom wall 28 provided at the end opposite to the locking protrusions 26, 27.

[0080] According to this third embodiment, the same effects as the first embodiment can be obtained, and since the sensor bracket 5 is not required, cost reduction can be further achieved. Furthermore, since the heat from the first wire 61 to the third wire 63 is easily transferred to the housing component 42 of the temperature sensor 4, the temperature detection accuracy of the first wire 61 to the third wire 63 can be further improved.

[0081] [Fourth Implementation Method]

[0082] Next, refer to Figure 13 and Figure 14 The physical quantity detection device 1C of the fourth embodiment will be described.

[0083] Figure 13 This is a perspective view showing the first retainer 2C according to the fourth embodiment. Figure 14 This is a cross-sectional view of the physical quantity detection device 1C according to the fourth embodiment. Figure 13 and Figure 14 In this document, for constituent elements that are common to the constituent elements described in the first to third embodiments, the same references are used. Figures 1 to 12 The same symbols are marked in the text, and repeated descriptions are omitted.

[0084] In the physical quantity detection device 1C of this embodiment, the housing component 42 of the temperature sensor 4 is elastically pressed toward the first wire 61 to the third wire 63, which is different from the structure of the third embodiment.

[0085] In this embodiment, an elastic portion 211 is provided on the outer wall 21 of the first retainer 2C to press the housing component 42 of the temperature sensor 4 against the first wire 61 to the third wire 63. Similar to the second embodiment, the elastic portion 211 is a tongue-shaped portion of the outer wall 21 that protrudes towards the retaining space 50. The side 42b of the housing component 42 of the temperature sensor 4, opposite to the contact surface 42a that abuts against the elastic portion 211, contacts the first wire 61 to the third wire 63. Therefore, heat from the first wire 61 to the third wire 63 is easily transferred to the housing component 42.

[0086] According to this fourth embodiment, compared with the third embodiment, the heat from the first wire 61 to the third wire 63 is more easily transferred to the housing component 42 of the temperature sensor 4, thus further improving the temperature detection accuracy of the first wire 61 to the third wire 63.

[0087] [Fifth Implementation]

[0088] Next, refer to Figures 15 to 19 The physical quantity detection device 1D of the fifth embodiment will be described.

[0089] Figure 15 This is a perspective view showing the physical quantity detection device 1D according to the fifth embodiment of the present invention. Figure 16 and Figure 17 This is an exploded 3D view of the physical quantity detection device. Figure 18 This is a perspective view showing the first wire 61 to the third wire 63 and the spacer 7D disposed between the first wire 61 to the third wire 63. Figure 19 This is a cross-sectional view of a physical quantity detection device. Figures 15 to 19 In this document, for constituent elements that are common to the constituent elements described in the first embodiment, the same as those in the document are marked as such. Figures 1 to 7 The same symbols are marked in the text, and repeated descriptions are omitted.

[0090] The physical quantity detection device 1D includes a first retainer 8 and a second retainer 3D disposed between a first wire 61 and a third wire 63, a cover member 9 locked to the first retainer 8, and a temperature sensor 4. Spacers 7D are respectively disposed between the first wire 61 and the second wire 62, and between the second wire 62 and the third wire 63. The first retainer 8, the cover member 9, the second retainer 3D, and the spacers 7D are made of injection-molded resin.

[0091] The second retainer 3D has: a first abutting surface 33a, which abuts against the first retainer 8 on one side of the arrangement direction of the first wire 61 to the third wire 63; and a second abutting surface 33b, which abuts against the first retainer 8 on the other side of the arrangement direction of the first wire 61 to the third wire 63. First fitting holes 331 to fourth fitting holes 334 are formed on the first abutting surface 33a, and fifth fitting holes 335 to eighth fitting holes 338 are formed on the second abutting surface 33b.

[0092] On the opposing surface 34a of the second retainer 3D, which faces the first wire 61 to the third wire 63, recessed surfaces 340a, 340b, and 340c are formed, which are recessed along the outer peripheral surfaces of the first wire 61 to the third wire 63 respectively. A first engaging groove 341 and a second engaging groove 342 are formed between the recessed surface 340a corresponding to the first wire 61 and the recessed surface 340b corresponding to the second wire 62, and between the recessed surface 340b corresponding to the second wire 62 and the recessed surface 340c corresponding to the third wire 63, respectively, which engage with the second connecting portions 77 (described below) of each pair of spacers 7D.

[0093] The spacer 7D integrally comprises: a first wire support portion 73 to a third wire support portion 75, each having a semi-circular groove 70 for receiving any one of the first wires 61 to the third wire 63; and plate-shaped first connecting portions 76 and second connecting portions 77, which connect the first wire support portions 73 to the third wire support portions 75 along the length direction of the first wires 61 to the third wires 63. The first wire support portion 73 is provided with a first anchoring portion 731 and a second anchoring portion 732, and the second wire support portion 74 is provided with a third anchoring portion 741. Furthermore, the third wire support portion 75 is provided with a fourth anchoring portion 751 to a sixth anchoring portion 753. The first to sixth anchoring portions 731, 732, 741, 751, 752, and 753 are protrusions that project in a direction perpendicular to the arrangement direction and length direction of the first wires 61 to the third wires 63.

[0094] A pair of spacers 7D and the first wires 61 to 63 are fixed together by a first fixing member 78 and a second fixing member 79. The first fixing member 78 is disposed between the first anchoring portion 731 and the second anchoring portion 732, and together with the first wires 61 to 63, surrounds the first wire support portion 73 of the pair of spacers 7D. The second fixing member 79 is disposed between the fifth anchoring portion 752 and the sixth anchoring portion 753, and together with the first wires 61 to 63, surrounds the third wire support portion 75 of the pair of spacers 7D. The first fixing member 78 and the second fixing member 79 can be molded, for example, molded parts, but they can also be constructed by combining multiple resin parts to form the first fixing member 78 and the second fixing member 79 respectively.

[0095] A holding space 80 for holding the temperature sensor 4 is formed in the first retaining member 8. The holding space 80 has an opening 800 that opens toward the side opposite to the first wire 61 to the third wire 63, and the opening 800 is closed by the cover member 9. The first retaining member 8 integrally includes: a clamping wall portion 81, which is located between the first wire 61 to the third wire 63 and the temperature sensor 4; a first side wall portion 82 and a second side wall portion 83, which are located on both sides of the clamping wall portion 81 in the arrangement direction of the first wire 61 to the third wire 63; a first protruding wall portion 84 and a second protruding wall portion 85, which are opposite each other across the holding space 80; and a bottom wall portion 86, which is located between the first protruding wall portion 84 and the second protruding wall portion 85.

[0096] The first protruding wall portion 84 and the second protruding wall portion 85 are provided from both ends of the clamping wall portion 81 in the arrangement direction of the first wire 61 to the third wire 63 in a direction perpendicular to the arrangement direction of the first wire 61 to the third wire 63 and the length direction. Furthermore, as the resin material for the first retaining member 8, in order to improve the temperature detection accuracy, a material with high thermal conductivity of 1 W / m·K or higher is preferably used, and a material with thermal conductivity of 3 W / m·K or higher is more preferred.

[0097] Furthermore, the first retainer 8 has a first abutting surface 8a that abuts against the first abutting surface 33a of the second retainer 3D and a second abutting surface 8b that abuts against the second abutting surface 33b of the second retainer 3D. The first abutting surface 8a and the second abutting surface 8b are provided with first engaging protrusions 871 to eighth engaging protrusions 878 that respectively engage with the first engaging holes 331 to eighth engaging holes 338 of the second retainer 3D. The first retainer 8 and the second retainer 3D are mutually locked together by engaging the first engaging protrusions 871 to eighth engaging protrusions 878 with the first engaging holes 331 to eighth engaging holes 338 of the second retainer 3D, thereby fixing them relative to the first wire 61 to the third wire 63.

[0098] Furthermore, the locking structure for the first retainer 8 and the second retainer 3D can be a structure in which multiple fitting protrusions of the second retainer 3D fit into multiple fitting holes formed in the first retainer 8, or it can be a snap-fit ​​structure.

[0099] On the opposing surface 81a of the clamping wall portion 81, which faces the first wire 61 to the third wire 63, recessed surfaces 810a, 810b, and 810c are formed, which are recessed along the outer peripheral surfaces of the first wire 61 to the third wire 63 respectively. A first engaging groove 811 and a second engaging groove 812 are formed between the recessed surface 810a corresponding to the first wire 61 and the recessed surface 810b corresponding to the second wire 62, and between the recessed surface 810b corresponding to the second wire 62 and the recessed surface 810c corresponding to the third wire 63, respectively, for engaging with the second connecting portions 77 of each pair of spacers 7D.

[0100] The cover component 9 integrally includes: a blocking wall 91 that blocks the opening 800 of the retaining space 80 of the first retainer 8; first arms 92 to fourth arms 95 that oppose the first protruding wall portion 84 and the second protruding wall portion 85 of the first retainer 8; and first engaging protrusions 96 to fourth engaging protrusions 99 that are disposed at the front ends of each of the first arms 92 to fourth arms 95. The first arms 92 to fourth arms 95 are disposed between the first protruding wall portion 84 and the second protruding wall portion 85 and the temperature sensor 4. More specifically, the first arm 92 and the third arm 94 are disposed between the first protruding wall portion 84 and the housing component 42 of the temperature sensor 4, and the second arm 93 and the fourth arm 95 are disposed between the second protruding wall portion 85 and the housing component 42 of the temperature sensor 4.

[0101] The first engaging protrusion 96 and the third engaging protrusion 98 engage with the engaging recesses 841 and 842 formed in the first protruding wall portion 84, and the second engaging protrusion 97 and the fourth engaging protrusion 99 engage with the engaging recesses 851 and 852 formed in the second protruding wall portion 85, thereby mounting the cover member 9 to the first retainer 8.

[0102] The sealing wall 91 of the cover component 9 is provided with an elastic portion 911 that presses the housing component 42 of the temperature sensor 4 toward the clamping wall portion 81. The elastic portion 911 is a tongue-shaped portion of the sealing wall 91 that protrudes toward the retaining space 80. Figure 19 As shown, the side 42b of the housing component 42 of the temperature sensor 4, opposite to the contact surface 42a that abuts against the elastic part 911, is in close contact with the clamping wall portion 81 without gap. As a result, heat from the first wire 61 to the third wire 63 can be easily transferred from the clamping wall portion 81 to the housing component 42.

[0103] Furthermore, a locking protrusion 912 is provided on the closing wall 91 of the cover member 9. This locking protrusion 912 locks the housing member 42 of the temperature sensor 4 to prevent the main body 40 of the temperature sensor 4 from dislodging from the holding space 80 along the arrangement direction of the first wire 61 to the third wire 63. The locking protrusion 912 is configured to face the pair of signal lines 441, 442 and protrude toward the clamping wall 81 of the first retainer 8. The temperature sensor 4 is prevented from falling out of the holding space 80 of the first retainer 8 by the cover member 9, and is fixed relative to the first wire 61 to the third wire 63 by the first retainer 8 and the second retainer 3D.

[0104] According to this fifth embodiment, the same effect as the first embodiment can be obtained, and since the heat of the first wire 61 to the third wire 63 is easily transferred to the housing component 42 of the temperature sensor 4, the detection accuracy of the temperature of the first wire 61 to the third wire 63 can be improved.

[0105] (Summary of Implementation Methods)

[0106] Next, the technical ideas learned from the embodiments described above will be described by reference to symbols and the like. Note that the symbols used in the following description are not intended to limit the constituent elements in the claims to the components specifically shown in the embodiments.

[0107] [1] A physical quantity detection device 1, 1A to 1D includes first and second retaining members 2, 2A, 2B, 2D, 3, 3D arranged across wires 61 to 63, and a physical quantity sensor (temperature sensor 4) fixed relative to the wires 61 to 63 by means of the first and second retaining members 2, 2A, 2B, 2D, 3, 3D. The physical quantity sensor 4 is used to detect the physical quantity of the wires 61 to 63, wherein the first and second retaining members 2, 2A, 2B, 2D, 3, 3D are fixed relative to the wires 61 to 63 by mutual locking.

[0108] [2] According to the physical quantity detection devices 1, 1A to 1C described in [1] above, the physical quantity sensor 4 is disposed between the first holding member 2, 2A, 2B and the wires 61 to 63.

[0109] [3] According to the physical quantity detection devices 1, 1A to 1C described in [1] above, a plurality of wires 61 to 63 are arranged in parallel between the first and second retaining members 2 and 3 via spacers 71 and 72, and at least one of the first and second retaining members 2 and 3 engages with the spacers 71 and 72.

[0110] [4] According to the physical quantity detection device 1, 1A to 1C described in [1] or [2] above, one of the first and second retaining members 2 and 3 has a plurality of arms 241 to 244 extending toward the other retaining member 3, and the front end of each of the plurality of arms 241 to 244 engages with the other retaining member 3.

[0111] [5] The physical quantity detection device 1, 1A according to any one of [1] to [3] above further includes a sensor bracket 5 having a holding space 50 for holding the physical quantity sensor 4, the sensor bracket 5 being disposed between the first holding member 2 and the wires 61 to 63.

[0112] [6] According to the physical quantity detection device 1, 1A described above [4], the sensor bracket 5 has an opening 502 that opens toward the first retaining member 2, and the opening 502 is blocked by the first retaining member 2.

[0113] [7] According to the physical quantity detection device 1, 1A described in [4] or [5] above, concave surfaces 53b, 53c, and 53d are formed on the opposing surface 53a of the sensor bracket 5 that is opposite to the wires 61 to 63, in a manner that is recessed along the outer peripheral surface of the wires 61 to 63.

[0114] [8] According to any one of [4] to [6] above, the physical quantity detection device 1, 1A, the physical quantity sensor 4 has a detection part (thermistor 41) that converts the physical quantity into an electrical signal, signal lines 451, 452 that transmit the electrical signal, and a housing part 42 that houses the detection part 41. The sensor bracket 5 is provided with an outlet window 501 that leads the signal lines 451, 452 out of the holding space 50, and locking protrusions 51, 52 that prevent the housing part 42 from being dislodged from the outlet window 501.

[0115] [9] According to the physical quantity detection device 1A described above [7], the inner surface 53b of the housing component 42 is elastically pressed toward the wires 61 to 63 side of the holding space 50.

[0116]

[10] According to any one of [1] to [3] above, the physical quantity detection device 1B, 1C has a holding space 20 formed in the first holding member 2 to hold the physical quantity sensor 4, and the holding space 20 opens toward the wires 61 to 63.

[0117]

[11] According to the physical quantity detection devices 1B and 1C described above [9], the physical quantity sensor 4 has a detection unit 41 that converts the physical quantity into an electrical signal, signal lines 451 and 452 that transmit the electrical signal, and a housing component 42 that houses the detection unit 41. The first retaining member 2 is provided with an outlet window 201 that leads the signal lines 451 and 452 out of the retaining space 20, and locking protrusions 26 and 27 that prevent the housing component 20 from dislodging from the outlet window 201.

[0118]

[12] According to the physical quantity detection device 1C described above

[10] , the housing component 42 is pressed elastically toward the wires 61 to 63.

[0119]

[13] According to the physical quantity detection device 1D described in [1] above, a holding space 80 for holding the physical quantity sensor 4 is formed in the first holding member 8.

[0120]

[14] According to the physical quantity detection device 1D described in

[13] above, the holding space 80 has an opening 800 that opens toward the side opposite to the wires 61 to 63, and the opening 800 is closed by a cover member 9 installed on the first holding member 8.

[0121]

[15] According to the physical quantity detection device 1D described in

[14] above, the first holding member 8 has a clamping wall portion 81 between the wires 61 to 63 and the physical quantity sensor 4, and concave surfaces 810a, 810b, and 810c are formed on the opposing surface 81a of the clamping wall portion 81 that is opposite to the wires 61 to 63, and are recessed along the outer peripheral surface of the wires 61 to 63.

[0122]

[16] According to the physical quantity detection device 1D described above

[15] , the cover member 9 is provided with an elastic part 911 that presses the physical quantity sensor 4 toward the clamping wall 81.

[0123] The first to fourth embodiments of the present invention have been described above, but the embodiments described above do not limit the invention as claimed in the patent claims. Furthermore, it should be noted that not all combinations of features described in the embodiments are necessary to solve the problems of the invention.

[0124] Furthermore, the present invention can be appropriately modified without departing from its spirit. For example, in the second and fourth embodiments, the case where an elastic portion 211 is provided on the outer wall 21 of the first retainer 2 has been described, but it is not limited to this; for example, the elastic portion may also be formed by an elastic body such as rubber or a spring. Furthermore, the number of wires used to detect the physical quantity is not limited to three; it may be one, two, or four or more.

Claims

1. A physical quantity detection device comprising a first holding member and a second holding member disposed over a wire, and a physical quantity sensor fixed relative to the wire by means of the first holding member and the second holding member, wherein the physical quantity sensor is used to detect a physical quantity of the wire, characterized in that, The first and second retaining members are fixed relative to the wire by interlocking with each other. The physical quantity detection device further includes a sensor bracket forming a holding space for holding the physical quantity sensor. The sensor bracket is disposed between the first retainer and the wire. The sensor bracket has an opening that opens toward the first retainer, and the opening is blocked by the first retainer.

2. The physical quantity detection device according to claim 1, characterized in that, The aforementioned physical quantity sensor is disposed between the aforementioned first retainer and the aforementioned wire.

3. The physical quantity detection device according to claim 1 or 2, characterized in that, A plurality of the aforementioned wires are arranged side-by-side via spacers between the first and second retaining members. At least one of the first retainer and the second retainer engages with the spacer.

4. The physical quantity detection device according to claim 1 or 2, characterized in that, The retainer of one of the first retainer and the second retainer has a plurality of arms extending toward the retainer of the other, the front ends of each of the plurality of arms engaging with the retainer of the other.

5. The physical quantity detection device according to claim 1 or 2, characterized in that, A concave surface is formed on the opposing surface of the sensor bracket that is opposite to the wire, and is recessed along the outer periphery of the wire.

6. The physical quantity detection device according to claim 1 or 2, characterized in that, The aforementioned physical quantity sensor includes a detection unit that converts the aforementioned physical quantity into an electrical signal, a signal line that transmits the aforementioned electrical signal, and a housing component that houses the aforementioned detection unit. The aforementioned sensor bracket is provided with an outlet window for exporting the aforementioned signal lines from the aforementioned holding space, and a locking protrusion to prevent the aforementioned housing component from dislodging from the aforementioned outlet window.

7. The physical quantity detection device according to claim 6, characterized in that, The inner surface of the housing component is elastically pressed against the wire side of the aforementioned retaining space.

8. The physical quantity detection device according to claim 1 or 2, characterized in that, The first retaining member has a retaining space for holding the physical quantity sensor. The aforementioned retaining space faces the aforementioned wire opening.

9. The physical quantity detection device according to claim 8, characterized in that, The aforementioned physical quantity sensor includes a detection unit that converts the aforementioned physical quantity into an electrical signal, a signal line that transmits the aforementioned electrical signal, and a housing component that houses the aforementioned detection unit. The first retaining member is provided with an outlet window for the signal line to be led out from the retaining space and a locking protrusion to prevent the housing component from dislodging from the outlet window.

10. The physical quantity detection device according to claim 9, characterized in that, Press the housing component elastically toward the aforementioned wire.

11. The physical quantity detection device according to claim 1, characterized in that, The first retaining member has a retaining space for retaining the physical quantity sensor.

12. The physical quantity detection device according to claim 11, characterized in that, The aforementioned retaining space has an opening facing the side opposite to the aforementioned wire. The opening is closed by a cover component installed on the first retainer.

13. The physical quantity detection device according to claim 12, characterized in that, The first retaining member has a clamping wall portion located between the wire and the physical quantity sensor. A concave surface is formed on the opposing surface of the clamping wall that is opposite to the wire, so as to be recessed along the outer peripheral surface of the wire.

14. The physical quantity detection device according to claim 13, characterized in that, The cover component is provided with an elastic part that presses the physical quantity sensor toward the clamping wall.

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