JP2009218471A - Resistor device for controlling speed of automotive blower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resistor device for controlling a speed of an automotive blower that causes neither clearance between heat sink plates nor asymmetrical heat dissipation conditions. <P>SOLUTION: A vertical-type resistor device 10 for controlling a speed includes (A) a resistor lamination member 20 in which a first heat sink plate 30, a first insulation board 40, a resistor 50, a second insulation board 60, and a second heat sink plate 70 are laminated and (B) an attachment member 80 made of resin. When applying a current, a heat generation amount of a first part 56 of the resistor 50 is larger than that of other parts 57 and 58 of the resistor. The first part 56 is located at the center area 20A of the resistor lamination member 20. The first heat sink plate 30 and the second heat sink plate 70 located in the upper neighborhood 20a, 20b<SB>1</SB>, and 20b<SB>2</SB>of the center area 20A and side areas 20B<SB>1</SB>and 20B<SB>2</SB>of the resistor lamination member 20 are mutually fixed by caulkings 71 and 72. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a resistance device for speed control of an automobile blower.

  A resistance device for controlling the speed of a blower for automobiles is known from, for example, Japanese Patent Laid-Open No. 62-211901. A resistance device for speed control of an automobile blower disclosed in this patent publication includes a resistor made of a patterned metal foil or metal plate, a heat sink, a pressing plate for fixing the resistor to the heat sink via an insulator, and The heat sink is fixed and held, and includes a mounting base having a connection terminal connected to a resistor. In this speed control resistance device, for example, a protective means for self-prevention due to overcurrent is provided between the resistor and the connection terminal, and when an abnormality such as a motor lock of the blower occurs. The current can be prevented from flowing through the resistor.

  By the way, in the resistance device for speed control disclosed in this patent publication, since the resistor is mounted in parallel with the mounting base, the heat sink is not only a part that radiates heat generated in the resistor, In order to attach to the attachment base, it is necessary to provide four legs. Therefore, waste is generated in the material for the heat sink. Specifically, the heat sink is manufactured from a rolled plate-like material by pressing. However, because four leg portions are provided, the amount of material to be discarded increases, and the manufacturing cost of the heat sink increases. End up. In addition, since the resistor is mounted in parallel with the mounting base, the mounting hole provided in the blower unit for mounting the speed control resistance device becomes large, and leakage of the blown air passing through the blower unit There is also a problem that the amount increases.

  The present inventor has developed a resistance device for controlling the speed of a blower for automobiles to solve such problems. In this speed control resistance device, the heat sink is arranged in a direction perpendicular to the mounting base. Thus, the leg portions need only be provided on one side of the heat sink, and there is no need to provide the leg portions so as to extend in four directions from both ends of the heat sink.

  FIG. 12 shows a perspective view of the speed control resistance device 210 after assembly, and FIG. 13 shows an exploded perspective view of the resistance laminated member 220 constituting the speed control resistance device 210. FIG. 3 is an exploded perspective view of the resin mounting member 80 that constitutes the structure, and FIG. 14 is a schematic plan view of the resistor 250 that constitutes the resistance laminated member 220.

  Here, the resistance laminated member 220 includes a first heat sink plate 230, a first insulating plate 240, a patterned foil-like resistor 250, a second insulating plate 260, and a second heat sink plate 270. Made up. The resistor 250 includes a first terminal portion 251, a second terminal portion 252, and two intermediate terminal portions 253 and 254. Further, the attachment member 80 includes a first connection terminal portion 81 connected to the first terminal portion 251 of the resistor 250, a second connection terminal portion 82 attached to the second terminal portion 252 of the resistor 250, and Each of the intermediate connection terminal portions 83 and 84 attached to the two intermediate terminal portions 253 and 254 of the resistor 250 is embedded. The attachment member 80 will be described in detail in the first embodiment.

  The resistance laminated member 220 is fixed substantially perpendicular to the attachment member 80 via attachment leg portions 277 provided so as to protrude from the lower end portion of the second heat sink plate 270. Further, the first terminal portion 251 of the resistor 250 and the first connection terminal portion 81 disposed on the attachment member 80 are connected via a leaf spring member 91 and a low melting point metal material (not shown). . Here, the leaf spring member 91 is made of a conductive material and is attached to the first connection terminal portion 81. A thermal fuse 90 is constituted by the leaf spring member 91 and the low melting point metal material.

  Here, the first heat sink plate 230, the first insulating plate 240, the second insulating plate 260, and the second heat sink plate 270 are each provided with the tip of the leaf spring member 91 and the resistor 250. Openings 236, 246, 266, 276 for connection are provided. The first heat sink plate 230, the first insulating plate 240, the second insulating plate 260, and the second heat sink plate 270 are provided with recesses 235, 245, 265, and 275, respectively. The connection terminal portion 81, the second connection terminal portion 82, and the intermediate connection terminal portions 83 and 84 are easily attached. Further, tongue portions 273 and 274 are provided at the lower end portion of the second heat sink plate 270, and concave portions 233 and 234 that engage with the tongue portions 273 and 274 are provided at the lower end portion of the first heat sink plate 230. When the resistance laminated member 220 is assembled, the first heat sink plate 230 and the second heat sink are formed by engaging the tongues 273 and 274 with the recesses 233 and 234 and bending the distal ends of the tongues 273 and 274. The mutual fixation of the plates 270 is made stronger.

In the conventional resistance laminated member 220, during energization, the amount of heat generated by the first portion 256 of the resistor 250 located between the first terminal portion 251 of the resistor 250 and one intermediate terminal portion 253 is: The first portion 256 is disposed in _one side region 220 </ b> B ₁ of the resistance laminated member 220, although it is larger than the heat generation amount of the other portions 257 and 258.

Further, the first heat sink plate 230 and the second heat sink plate 270 located in the vicinity of the upper ends 220b ₁ and 220b ₂ of both side regions 220B ₁ and 220B ₂ of the resistance laminated member 220 are caulked to each other. It is fixed to. Specifically, a claw portion 272 is provided in the portion of the second heat sink plate 270 located in the vicinity of the upper ends 220b ₁ and 220b ₂ of the side regions 220B ₁ and 220B ₂ of the resistance laminated member 220, and the resistance laminated member 220 is provided. A mounting hole 232 is provided in the portion of the first heat sink plate 230 located in the vicinity of the upper ends 220b ₁ and 220b ₂ of the side regions 220B ₁ and 220B ₂ , and the claw portion 272 is inserted into the mounting hole 232. The first heat sink plate 230 and the second heat sink plate 230 located in the vicinity of the upper ends 220b ₁ and 220b ₂ of the side regions 220B ₁ and 220B ₂ of the resistance laminate member 220 are bent by bending the tip of the claw portion 272 protruding from the mounting hole 232. The heat sink plates 270 are fixed to each other.

JP 62-211901

In this way, in the conventional resistance device 210 for controlling the speed of the blower for automobiles, the first heat sink plate positioned in the vicinity of the upper ends 220b ₁ and 220b ₂ of the side regions 220B ₁ and 220B ₂ of the resistance laminated member 220. The portions 230 and the second heat sink plate 270 are fixed to each other by caulking. However, In such a structure, the strength at the time of caulking, deformed laterally region 220B _1, near the upper end 220b ₁ of 220B _2, 220b ₂ and near the upper end 220a of the central region 220A of the resistor laminated member 220 May occur, and a gap may be generated in the central region 220 </ b> A of the resistance laminated member 220. More specifically, a gap may be generated between the upper end portion of the central region of the first heat sink plate 230 and the upper end portion of the central region of the second heat sink plate 270. When such a gap is generated, the contact state between the resistor 250 and the insulating plates 240 and 260 and the contact state between the insulating plates 240 and 260 and the heat sink plates 230 and 270 are reduced. It becomes difficult locally to transfer the heat from the body 250 to the heat sink plates 230 and 270, and an abnormal temperature rise of the resistor 250 itself may be induced. In addition, when such a gap is generated, high humidity air or water droplets sucked from the outside by the automobile blower may enter the gap, and the resistor 250 may be damaged such as corrosion.

Further, in the conventional resistance laminated member 220, the amount of heat generated by the first portion 256 of the resistor 250 located between the first terminal portion 251 of the resistor 250 and one intermediate terminal portion 253 when energized. Is larger than the calorific value of the other portions 257 and 258. Here, since the first portion 256 is disposed in _one side region 220B ₁ of the resistance laminated member 220, the heat dissipation state from the heat sink plates 230 and 270 becomes asymmetric, and the cooling effect of the resistance laminated member 220 is increased. There is a possibility that a problem such as a decrease in the resistance or a thermal distortion of the resistance laminated member 220 may be caused.

  Accordingly, an object of the present invention is to have a configuration and structure in which a gap is not generated between the first heat sink plate and the second heat sink plate, and the heat dissipation state from the heat sink plate is not asymmetric. An object of the present invention is to provide a resistance device for controlling the speed of an automobile blower.

In order to achieve the above object, a resistance device for speed control of a blower for automobiles of the present invention,
(A-1) a first heat sink plate,
(A-2) a first insulating plate,
(A-3) A foil-shaped resistor having a first terminal portion, a second terminal portion, and an intermediate terminal portion, and patterned,
(A-4) a second insulating plate, and
(A-5) a second heat sink plate,
A laminated resistance member, and
(B) The 1st connecting terminal part connected to the 1st terminal part of a resistor, the 2nd connecting terminal part attached to the 2nd terminal part of a resistor, and the middle attached to the intermediate terminal part of a resistor A resin mounting member in which each of the connection terminal portions is embedded,
A resistance device for speed control of a blower for automobiles, comprising:
The resistance laminated member is fixed substantially perpendicularly to the mounting member via a mounting leg provided protruding from the lower end of the second heat sink plate.
The first terminal portion of the resistor and the first connection terminal portion embedded in the attachment member are connected via a leaf spring member and a low melting point metal material,
The leaf spring member is made of a conductive material, and is attached to one of the first terminal portion and the first connection terminal portion,
When energized, the amount of heat generated in the first portion of the resistor located between the first terminal portion and the intermediate terminal portion of the resistor is greater than the amount of heat generated in the other portions of the resistor,
The first portion of the resistor is disposed in the central region of the resistance laminated member,
The portions of the first heat sink plate and the second heat sink plate located in the vicinity of the upper end of the central region and the side region of the resistance laminated member are fixed to each other by caulking. The first heat sink plate and the second heat sink plate located near the upper end of the central region of the resistance laminated member are fixed to each other by caulking. If the number of such caulking is at least “1”, It may be “2” or more.

  Here, when the shape of the resistive laminate member is a rectangle having a length L and a height H, the central region of the resistive laminate member is specifically L / 2 along the length direction of the resistive laminate member. Means a rectangular region of H / 2 along the height direction. Alternatively, when the area of the resistive laminate member is S, the central region of the resistive laminate member specifically means a region having an area of S / 4. However, the center of the central region of the resistive laminate member and the center of the resistive laminate member coincide. In addition, the first portion of the resistor is arranged in the central region of the resistive laminate member. Specifically, the central portion of the first terminal portion of the resistor is located in the central region of the resistive laminate member. Means that

  In the resistance device for controlling the speed of a blower for an automobile according to the present invention, one of the first heat sink plate and the second heat sink plate located near the upper end of the central region and the side region of the resistance laminated member. Is provided with a claw portion, and the other is provided with an attachment hole. The claw portion is inserted into the attachment hole, and the tip of the claw portion protruding from the attachment hole is bent, so that the central region of the resistance laminated member is The first heat sink plate and the second heat sink plate located near the upper end of the side region may be fixed to each other. However, the present invention is not limited to such a form. For example, a through hole may be provided in the first heat sink plate and the second heat sink plate, and a rivet made of aluminum or the like may be passed through the through hole to caulk the rivet. .

  In the resistance device for controlling the speed of a blower for automobiles of the present invention including the above preferred embodiment, the outer edge of the first heat sink plate, the outer edge of the second heat sink plate, or the first heat sink plate Further, the bead portion is provided at the outer edge portion of the second heat sink plate, so that the bending rigidity of the first heat sink plate and / or the second heat sink plate can be improved without increasing the number of parts and materials. It is possible to maintain high flatness even after caulking without increasing the thickness of the material constituting the heat sink plate. Here, the bead part is a kind of continuous or discontinuous convex protrusion, and can be obtained by, for example, pressing the heat sink plate. The outer edge portion of the heat sink plate to be provided with the bead portion refers to, for example, the vicinity of the upper end of the central region and the side region of the resistance laminated member and the vicinity of the end portion of the side region. The bead portion preferably extends in parallel with the upper end portion of the central region and the side region of the resistance laminated member, and also extends in parallel with the end portion of the side region.

  Furthermore, in the resistance device for controlling the speed of a blower for automobiles of the present invention including the above preferred embodiment, the resistor is made of a metal or an alloy, more specifically, a Ni-Cr alloy. This is preferable from the viewpoint of improving the corrosion resistance of the resistor. Specifically, as the Ni-Cr alloy, one type (symbol: NCHRW1), two types (symbol: NCHRW2) of nickel chrome strips for electric heating defined in JIS C2520: 1999 “Electric Heating Alloy Wires and Strips” or There are three types (symbol: NCHRW3).

  Moreover, in the resistance device for controlling the speed of the blower for automobiles of the present invention including the various preferred embodiments described above, the end portion of the second heat sink plate corresponding to the end portion of the side region of the resistance laminated member is: The bent mounting leg is provided so as to protrude from the lower end of the bent second heat sink plate and is inserted into a fixing hole provided in the mounting member. This is preferable from the viewpoint of suppressing the temperature rise of the portion of the resin mounting member in contact with the mounting leg. It is desirable that the bending be performed at a right angle or a substantially right angle (including variations in the manufacturing process of the second heat sink plate). Furthermore, it is preferable that a notch portion extending in parallel with the end portion of the second heat sink plate is provided at a lower portion of the end portion of the bent second heat sink plate.

  In the resistance device for speed control of the present invention including the above various preferred embodiments (hereinafter simply referred to as “resistive device for speed control of the present invention”), the first heat sink plate and the second heat sink plate are: For example, a material such as an aluminum plate, a tin-plated steel plate, a galvanized steel plate, or a nickel-plated steel plate may be produced by, for example, pressing, and the first insulating plate and the second insulating plate may be, for example, mica (mica). The heat-resistant film (for example, polyimide film) and the heat-resistant non-woven fabric (for example, non-woven fabric made of meta-aramid fiber) may be made by a method such as press working or mechanical cutting. Patterning of foil-like (including film-like, sheet-like, plate-like) resistors is performed by etching, pressing, mechanical cutting of foil-like (including film-like, sheet-like, plate-like) materials, It may be performed based on a method such as laser processing. The resin mounting member may be made of a material such as polyamide resin, polybutylene terephthalate (PBT) resin, phenol resin, polypropylene (PP) resin, and the first connection terminal portion, the second connection terminal portion, and the middle. The connection terminal portion may be made of a well-known conductive material such as copper or copper alloy, or copper or copper alloy plated on the surface. As a method for producing the mounting member in which these connection terminal portions are embedded, for example, insert An injection molding method can be mentioned.

  Examples of the material constituting the leaf spring member include phosphor bronze, stainless steel plate with nickel plating on the surface, and white (which is an alloy composed of copper, zinc and nickel, and is also called silver). Examples of the low melting point metal material include Sn—Ag alloys and Sn—Pb alloys. A thermal fuse is constituted by the leaf spring member and the low melting point metal material. As a method of attaching the second terminal portion of the resistor to the second connection terminal portion and attaching the intermediate terminal portion of the resistor to the intermediate connection terminal portion, the second terminal portion of the resistor, the intermediate terminal portion as the second connection terminal portion, Examples thereof include a method of inserting into the intermediate connection terminal portion, a method of fixing using a solder material having a melting point higher than that of the low melting point metal material, a method using these in combination, a spot welding method, and an ultrasonic fusion method.

  In the speed control resistance device of the present invention, the first connection terminal portion is connected to a motor of an automobile blower. The number (N) of the intermediate connection terminal portions may be 1 or 2 or more, and is determined based on the specification of the speed control resistance device, and is for the number of stages of (N + 1). The amount of air blower is defined. Specifically, for example, if N = 2, the blower of the automobile blower can be changed to “strong”, “medium”, and “weak”. The switching can be performed by air volume switching means such as a lever or a knob. An automobile blower is incorporated in an automobile air conditioner. The resistance laminated member is cooled by the flow of wind (airflow) generated by the automobile blower.

  In the resistance device for speed control of the present invention, the amount of heat generated in the first portion of the resistor located between the first terminal portion and the intermediate terminal portion of the resistor during energization is different from that of the resistor. Since the first portion of the resistor is disposed in the central region of the resistance laminated member, the heat dissipation state from the heat sink plate is substantially symmetrical, and the cooling effect of the resistance laminated member is reduced. Such as the above-mentioned problem and the problem of increasing the thermal distortion of the resistive laminated member. In addition, in the resistance device for speed control of the present invention, the first heat sink plate and the second heat sink plate located near the upper end of the central region and the side region of the resistance laminated member are mutually caulked. Because it is fixed, the contact between the resistor and the insulation plate and the contact between the insulation plate and the heat sink plate are not reduced, and heat from the resistor is efficiently transferred to the heat sink plate. And the abnormal temperature rise of the resistor itself is not induced. Moreover, since the high-humidity air or water droplets sucked from the outside by the blower for automobiles do not enter the inside of the resistance laminated member, that is, do not enter the gap between the heat sink plate and the heat sink plate. There is no damage such as corrosion. Further, since it is not necessary to increase the thickness of the heat sink plate, the manufacturing cost of the speed control resistance device is not increased. Further, the mounting member can be reduced in size by making the heat sink plate vertical, and the mounting hole to be opened in the blower unit can be reduced. Therefore, the leakage amount of the blown air can be reduced.

  Furthermore, by disposing the first terminal portion of the resistor in the central region of the resistance laminated member, the time for melting the low melting point metal material when an abnormality such as a motor lock for an automobile blower occurs (temperature fuse) (Operation time) can be shortened, and a safer resistance device for speed control can be provided.

  Hereinafter, the present invention will be described based on examples with reference to the drawings.

  [Embodiment 1] Embodiment 1 relates to a resistance device for speed control of an automobile blower of the present invention. FIG. 1 shows a perspective view after assembly of the speed control resistance device 10 of the automobile blower of the first embodiment, and FIG. 2 shows an exploded perspective view of the resistance laminated member 20 constituting the speed control resistance device 10. An exploded perspective view of the member 80 is shown in FIG. 3, a schematic plan view of the resistor 50 is shown in FIG. 4, and a schematic plan view of the first heat sink plate 30 constituting the resistance laminated member 20 is shown in FIG. 5. A schematic plan view of the second heat sink plate 70 shown in FIG. 5A and constituting the resistance laminated member 20 is shown in FIG. 5B, and a circuit diagram of the speed control resistance device 10 is shown in FIG.

  The speed control resistance device 10 of the automobile blower of the first embodiment is composed of a resistance laminated member 20 and a resin mounting member 80. Here, the resistance laminated member 20 is formed by sequentially laminating a first heat sink plate 30, a first insulating plate 40, a resistor 50, a second insulating plate 60, and a second heat sink plate 70. . The resistor 50 includes a first terminal portion 51, a second terminal portion 52, and an intermediate terminal portion (in the first embodiment, two intermediate terminal portions 53 and 54), and is patterned and has a foil shape. The metal material or the alloy material is used for the etching process. The resin attachment member 80 manufactured by the insert injection molding method is attached to the first connection terminal portion 81 connected to the first terminal portion 51 of the resistor 50 and the second terminal portion 52 of the resistor 50. The second connection terminal portion 82 and the intermediate connection terminal portions attached to the intermediate terminal portions 53 and 54 of the resistor 50 (in the first embodiment, the two intermediate connection terminal portions 83 and 84), respectively. Have been buried.

  Specifically, the first heat sink plate 30 and the second heat sink plate 70 are manufactured by pressing an aluminum plate having a thickness of 1.2 mm, and the first insulating plate 40 and the second insulating plate are formed. The plate 60 is produced by pressing mica (mica). The resistor 50 is made of a foil-like alloy material having a thickness of 40 μm (specifically, a Ni-Cr alloy such as one kind of nickel-chrome band for electric heating (symbol: NCHRW1) defined in JIS C2520: 1999). Therefore, it is manufactured by etching. The attachment member 80 is formed from a polyamide resin (specifically, a glass fiber reinforced polyamide 66 resin).

  The resistance laminated member 20 is fixed substantially perpendicularly to the mounting member 80 via mounting leg portions 77 provided so as to protrude from the lower end portion of the second heat sink plate 70. The first terminal portion 51 of the resistor 50 and the first connection terminal portion 81 disposed on the attachment member 80 are made of a conductive material, and any of the first terminal portion 51 and the first connection terminal portion 81 is used. On the other hand (specifically, in the first embodiment, the plate spring member 91 made of phosphor bronze attached to the first connection terminal portion 81 by a caulking method) and a low melting point metal material (Sn−) (not shown). A material such as an Ag-based alloy or a Sn—Pb-based alloy). A thermal fuse 90 is constituted by the leaf spring member 91 and the low melting point metal material. As a result, the low melting point metal material is melted by Joule heat generated from the resistor 50 in the event of an abnormality such as a motor lock, and as a result, the contact between the leaf spring member 91 and the first terminal portion 51 is released. The conduction between the part 51 and the first connection terminal part 81 is quickly interrupted. Each of the first heat sink plate 30, the first insulating plate 40, the second insulating plate 60, and the second heat sink plate 70 has an opening for connecting the tip of the leaf spring member 91 and the resistor 50. Portions 36, 46, 66, and 76 are provided. Specifically, a metal piece 92 is fixed to the first terminal portion 51 of the resistor 50 by a spot welding method, and the tip end portion of the leaf spring member 91 is connected to the metal piece 92 via a low melting point metal material. It is fixed. The central portion of the first terminal portion 51 of the resistor 50 is disposed in the central region 20 </ b> A of the resistive laminated member 20. Here, the central region 20A of the resistive laminate member 20 having a rectangular shape is defined as L / 2 along the length direction of the resistive laminate member 20 when the length of the resistive laminate member 20 is L and the height is H. Means a rectangular region of H / 2 along the height direction. However, the center of the central region 20A of the resistive laminate member 20 and the center of the resistive laminate member 20 coincide. As a result, when an abnormality such as a motor lock occurs in the motor 101 of the automobile blower, the time for melting the low melting point metal material (the operating time of the temperature fuse 90) can be shortened. A high speed control resistance device 10 can be provided.

  The first heat sink plate 30, the first insulating plate 40, the second insulating plate 60, and the second heat sink plate 70 are provided with recesses 35, 45, 65, and 75, respectively. The terminal portion 81, the second connection terminal portion 82, and the intermediate connection terminal portions 83 and 84 are easily attached. Further, tongue portions 73 and 74 are provided at the lower end portion of the second heat sink plate 70, and concave portions 33 and 34 that engage with the tongue portions 73 and 74 are provided at the lower end portion of the first heat sink plate 30. The first heat sink plate 30 and the second heat sink plate 30 are provided by engaging the tongue portions 73 and 74 with the recess portions 33 and 34 and bending the tip portions of the tongue portions 73 and 74 when the resistance laminated member 20 is assembled. The heat sink plates 70 are fixed to each other more firmly.

When energized, the amount of heat generated in the first portion 56 of the resistor 50 located between the first terminal portion 51 and the intermediate terminal portion 53 of the resistor 50 is determined by the other portions 56 and 57 ( The amount of heat generated by the portion 56 of the resistor 50 positioned between the intermediate terminal portion 53 and the intermediate terminal portion 54 and the portion 57) of the resistor 50 positioned between the intermediate terminal portion 54 and the second terminal portion 52. The first portion 56 of the resistor 50 is disposed in the central region 20 </ b> A of the resistance laminated member 20. Further, the first heat sink plate 30 located in the vicinity of the upper end 20a of the central region 20A of the resistance laminated member 20 and in the vicinity of the upper ends 20b ₁ and 20b ₂ of the two side regions 20B ₁ and 20B ₂ of the resistive laminated member 20. A total of three portions of the second heat sink plate 70 are fixed to each other by caulking.

Specifically, the first heat sink plate 30 located in the vicinity of the upper end 20a of the central region 20A of the resistance laminate member 20 and in the vicinity of the upper ends 20b ₁ and 20b ₂ of the side regions 20B ₁ and 20B ₂ of the resistance laminate member 20. And claw portions 71 and 72 are provided on any one of the parts (three parts) of the second heat sink plate 70 (specifically, in the first embodiment, the part of the second heat sink plate 70). Mounting holes 31 and 32 are provided on the other side (specifically, in the first embodiment, the portion of the first heat sink plate 30). Then, by inserting the claw portions 71 and 72 into the attachment holes 31 and 32 and bending the tip portions of the claw portions 71 and 72 protruding from the attachment holes 31 and 32, the vicinity of the upper end 20 a of the central region 20 </ b> A of the resistance laminated member 20. The portions of the first heat sink plate 30 and the second heat sink plate 70 located in the vicinity of the upper ends 20b ₁ and 20b ₂ of the side regions 20B ₁ and 20B ₂ of the resistance laminated member 20 are firmly It is fixed without a gap.

  Here, the point that the mounting holes 31 and the claw portions 71 are provided in the portions of the first heat sink plate 30 and the second heat sink plate 70 located in the vicinity of the upper end 20a of the central region 20A of the resistance laminated member 20 is the conventional point. This is different from the resistance laminated member 220.

Further, the end portion of the second heat sink plate 70 corresponding to the end portions of the side regions 20B ₁ and 20B ₂ of the resistance laminated member 20 is bent in a substantially right angle direction. The mounting legs 77 are provided so as to protrude from the lower ends of the end portions of the side regions 20B ₁ and 20B ₂ of the second heat sink plate 70 bent in a substantially right angle direction. The resistance laminated member 20 is attached to the attachment member 80 by bending the tip end portion of the attachment leg portion 77 that is inserted into the fixed fixing hole portion 85 and protrudes from the fixing hole portion 85. A notch 78 is provided in parallel to the end of the second heat sink plate 70 at the lower portion of the end of the side regions 20B ₁ and 20B ₂ of the second heat sink plate 70 bent in a substantially right angle direction. . The notch 78 extends upward from the lower end of the side regions 20B ₁ , 20B ₂ of the second heat sink plate 70. The end portions of the side regions 20B ₁ and 20B ₂ of the second heat sink plate 70 bent in a substantially right angle direction are connected to the main body portion of the second heat sink plate 70 at the upper part. As a result, the path of heat transmitted from the second heat sink plate 70 to the mounting member 80 can be lengthened, and the temperature rise of the mounting member 80 can be suppressed. As a result, it is not necessary to use an expensive heat-resistant resin as a material constituting the attachment member 80, and the attachment member 80 can be manufactured at a low cost.

  The first connection terminal portion 81, the second connection terminal portion 82, and the intermediate connection terminal portions 83 and 84 may be made of a known conductive material such as copper or copper alloy, or copper or copper alloy plated on the surface, The second terminal portion 52 of the resistor 50 is attached to the second connection terminal portion 82, and the intermediate terminal portions 53 and 54 of the resistor 50 are attached to the intermediate connection terminal portions 83 and 84. This can be done by inserting the terminal portions 53 and 54 into the second connection terminal portion 82 and the intermediate connection terminal portions 83 and 84. The first connection terminal portion 81, the second connection terminal portion 82, and the intermediate connection terminal portions 83 and 84 that protrude from the attachment member 80 are inserted into the vehicle-side harness. Further, the attachment member 80 is fixed to the blower unit 100 through the attachment hole 86.

  As shown in FIGS. 7 and 8, in a blower unit 100 that is a component part of an automotive air conditioner, a blower motor 101 to which a fan 102 is attached is incorporated in a scroll case 103. The speed control resistance device 10 is attached to the inside of the scroll case 103 on the downstream side of the intake air. Specifically, the speed control resistance device 10 is attached to the mounting hole 104 provided in the scroll case 103. The first connection terminal portion 81 is connected to the motor 101 of the automobile blower. The motor 101 is also connected in series to a battery 110 (shown only in FIG. 6). The number (N) of the intermediate connection terminal portions is N = 2 as described above, and the air volume adjustment of the blower is performed by controlling the rotational speed of the motor 101. , Can be changed to “weak”. Note that the switching is performed by selecting the intermediate connection terminal portions 83 and 84 by the air volume switching means 87 (shown only in FIG. 6) such as a lever and a knob, and determining the voltage applied to the motor 101. Can do.

  The air blown from the air conditioner for automobiles may be taken from outside the vehicle or the air inside the vehicle may circulate. This is selected depending on the operation position of the damper 105 shown in FIG. 8. For example, when the damper 105 is operated so as to be positioned on the “A side” shown in FIG. When the damper 105 is operated so as to be positioned on the “B side”, the air in the vehicle circulates. However, “A side” and “B side” are determined for convenience of explanation, and the shape, position, etc. differ depending on the actual vehicle structure, but selection of air intake from inside and outside the vehicle is appropriately performed. .

  The speed control resistance device 10 generates heat due to Joule heat generated by the resistor 50 itself during energization, but is cooled via the heat sink plates 30 and 70 by the flow of wind generated by the rotation of the motor 101. At this time, as described above, the speed control resistance device 10 comes into contact with the outside air taken in from the outside of the vehicle, and depending on the use conditions of the traveling vehicle, the season, etc., in high-humidity air, water droplets, snowfall areas, etc. It is exposed to the mist of the snow melting agent used (for example, calcium chloride).

  In the conventional speed control resistance device 210, as described above, a gap is easily generated between the pair of heat sink plates 230 and 270. In particular, since the heat sink plates 230 and 270 have a horizontally long dimensional ratio, a gap is easily generated at the upper end portion in the longitudinal direction. Therefore, high-humidity air, water droplets, and a mist of a snow melting agent enter between the pair of heat sink plates 230 and 270 from this gap and stay in the space between the resistor 250 and the insulating plates 240 and 260. Corrosive solution. And the corrosive solution which penetrate | invaded the inside of the resistance laminated member 220 evaporates whenever it touches the surface of the resistor 250, and the density | concentration increases gradually. Then, the corrosive solution having a high concentration results in a higher corrosion effect, and the corrosion of the resistor 250 progresses at an accelerated rate. Concentration of power occurs, causing a local temperature rise. As a result of the above, the resistor 250 may be broken by both electrical and chemical actions.

  On the other hand, in the first embodiment, there is no gap between the upper end portions of the pair of heat sink plates 30 and 70, so that such a phenomenon does not occur.

Table 1 below shows the results of measuring the current value (unit: amperes), the calorific value (unit: watts), and the temperature rise from the ambient temperature (unit: ° C) when the resistor 50 is energized. Here, the first section refers to the first portion 56 of the resistor 50 located between the first terminal portion 51 of the resistor 50 and the one intermediate terminal portion 53, and the second section refers to the resistor 50. Of the resistor 50 located between the one intermediate terminal portion 53 and the other intermediate terminal portion 54, and the third section is the other intermediate terminal portion 54 and the second terminal portion 52 of the resistor 50. The portion 58 of the resistor 50 located between the two. The resistance value in these sections varies depending on the vehicle model. In the example shown in Table 1, the 1st section was the highest calorific value, and the temperature rise was the highest. And since the 1st area is arrange | positioned in the center area | region 20A of the resistance laminated member 20, the heat dissipation state from the heat sink board 30 and 70 becomes substantially symmetrical, The problem of the fall of the cooling effect of the resistance laminated member 20 arises. The problem that the thermal distortion of the resistance laminated member 20 is increased does not occur. In addition, the first heat sink plate 30 and the second heat sink plate 70 located in the vicinity of the upper ends 20a, 20b ₁ and 20b ₂ of the central region 20A and the side regions 20B ₁ and 20B ₂ of the resistance laminated member 20 are caulked. So that the contact state between the resistor 50 and the insulating plates 40 and 60 and the contact state between the insulating plates 40 and 60 and the heat sink plates 30 and 70 are not lowered. Heat from the resistor 50 can be efficiently transferred to the heat sink plates 30 and 70, and an abnormal temperature rise of the resistor itself is not induced. Further, since the high-humidity air or water droplets sucked from the outside by the blower for automobiles do not enter the inside of the resistance laminated member 20, that is, do not enter the gap between the heat sink plate 30 and the heat sink plate 70. In addition, damage such as corrosion does not occur in the resistor 50. Further, since it is not necessary to increase the thickness of the heat sink plates 30 and 70, the manufacturing cost of the speed control resistance device is not increased. Further, the mounting member 80 can be reduced in size by making the heat sink plates 30 and 70 vertical, and the mounting hole 104 to be opened in the blower unit can be reduced, so that the leakage amount of the blown air is reduced. be able to. In addition, since the first terminal portion 51 of the resistor 50 is disposed in the central region 20A of the resistance laminated member 20, when an abnormality such as a motor lock occurs, the time for the low melting point metal material to melt (temperature fuse 90) (Operating time) can be shortened. Specifically, the thermal fuse operating time was shortened by about 5 to 12% compared to the conventional product.

[Table 1]
Section First Section Second Section Third Section Resistance (Ω) 0.3 1.0 2.3
Current value (A) 16.4 8.2 4.2
Calorific value (W) 80.7 67.2 40.6
Temperature rise from ambient temperature (° C) 213 201 167

  The second embodiment is a modification of the first embodiment. FIG. 9 is a perspective view after assembling the speed control resistance device of the automobile blower of the second embodiment, and FIG. 10 shows a resistance laminated member constituting the speed control resistance device of the automobile blower of the second embodiment. 11A and 11B are schematic views of the first heat sink plate and the second heat sink plate in the resistance laminated member constituting the speed control resistance device according to the second embodiment. A schematic plan view is shown.

  In the second embodiment, the bead portions 39 and 79 are provided at the outer edge portion of the first heat sink plate 30 and the outer edge portion of the second heat sink plate 70, thereby the heat sink plates 30 and 70. Can be improved, and high flatness can be maintained even after caulking without increasing the thickness of the material constituting the heat sink plates 30 and 70. Here, the bead portions 39 and 79 which are discontinuous kinds of convex protrusions can be obtained by pressing the heat sink plates 30 and 70 made of an aluminum plate having a thickness of 1.2 mm. 79 had a width of 1.5 mm and a height of 0.5 mm. By providing the bead portions 39 and 79, the bending strength of the heat sink plate increased by about 1.8 to 2.1 times compared to the heat sink plate without the bead portion.

  As mentioned above, although this invention was demonstrated based on the preferable Example, this invention is not limited to these Examples. The configuration, structure, shape, and the like of the resistance laminate member and the attachment member described in the embodiments are exemplifications, and needless to say, can be changed as appropriate, and the materials constituting the resistance laminate member and the attachment member are also examples. Needless to say, it can be changed as appropriate.

FIG. 1 is a perspective view after assembly of a resistance device for speed control of an automobile blower according to a first embodiment. FIG. 2 is an exploded perspective view of a resistance laminated member constituting the resistance device for speed control of the automobile blower according to the first embodiment. FIG. 3 is an exploded perspective view of a mounting member constituting the resistance device for speed control of the automobile blower of the first and second embodiments. FIG. 4 is a schematic plan view of a resistor constituting the speed control resistor device of the automobile blower according to the first embodiment and the second embodiment. FIGS. 5A and 5B are schematic plan views of the first heat sink plate and the second heat sink plate in the resistance laminated member constituting the speed control resistance device of the first embodiment, respectively. FIG. 6 is a circuit diagram of a resistance device for speed control of an automobile blower according to the first and second embodiments. FIG. 7 is a schematic perspective view of a blower unit or the like in which a resistance device for speed control of an automobile blower of Example 1 or Example 2 is incorporated. FIG. 8 is a schematic partial cross-sectional view of a blower unit or the like in which a resistance device for speed control of an automobile blower of Example 1 or Example 2 is incorporated. FIG. 9 is a perspective view after assembly of the resistance device for speed control of the automobile blower of the second embodiment. FIG. 10 is an exploded perspective view of a resistance laminated member constituting the resistance device for speed control of the automobile blower of the second embodiment. FIGS. 11A and 11B are schematic plan views of a first heat sink plate and a second heat sink plate in a resistance laminated member constituting the speed control resistance device of the second embodiment, respectively. FIG. 12 is a perspective view after assembling a resistance device for speed control of a conventional automobile blower. FIG. 13 is an exploded perspective view of a resistance laminated member constituting a resistance device for speed control of a conventional automobile blower. FIG. 14 is a schematic plan view of a resistor constituting a resistance laminated member in a resistance device for speed control of a conventional automobile blower.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Resistance apparatus for speed control of a blower for automobiles, 20 ... Resistance laminated member, 20A ... Central region of resistance laminated member, 20a ... Near the upper end of the central region of resistive laminated member, 20B ₁ , 20B ₂ ... Side region of the resistance laminate member, 20b ₁ , 20b ₂ ... Near the upper end of the side region of the resistance laminate member, 30... First heat sink plate, 31 and 32. 33, 34, 35, 45, 65, 75 ... recess, 36, 46, 66, 76 ... opening, 39, 79 ... bead, 40 ... first insulating plate, 50 ... resistor, 51 ... first terminal part, 52 ... second terminal part, 53,54 ... intermediate terminal part, 56 ... first part of resistor, 57,58 ... Other parts of the resistor, 60 ... second insulating plate, 70 ... second heat sink plate, 71, 72 ... Claw part, 73, 74 ... Tongue part, 77 ... Mounting leg part, 78 ... Notch part, 80 ... Mounting member, 81 ... First connection terminal part, 82 ... Second connection terminal portion, 83, 84 ... Intermediate connection terminal portion, 85 ... Fixing hole portion, 86 ... Mounting hole, 87 ... Air volume switching means, 90 ... Temperature Fuse, 91 ... leaf spring member, 92 ... metal piece, 100 ... blower unit, 101 ... motor, 102 ... fan, 103 ... scroll case, 104 ... for mounting Hole, 105 ... damper, 110 ... battery

Claims (6)

(A-1) a first heat sink plate,
(A-2) a first insulating plate,
(A-3) A foil-shaped resistor having a first terminal portion, a second terminal portion, and an intermediate terminal portion, and patterned,
(A-4) a second insulating plate, and
(A-5) a second heat sink plate,
A laminated resistance member, and
(B) The 1st connecting terminal part connected to the 1st terminal part of a resistor, the 2nd connecting terminal part attached to the 2nd terminal part of a resistor, and the middle attached to the intermediate terminal part of a resistor A resin mounting member in which each of the connection terminal portions is embedded,
A resistance device for speed control of a blower for automobiles, comprising:
The resistance laminated member is fixed substantially perpendicularly to the mounting member via a mounting leg provided protruding from the lower end of the second heat sink plate.
The first terminal portion of the resistor and the first connection terminal portion embedded in the attachment member are connected via a leaf spring member and a low melting point metal material,
The leaf spring member is made of a conductive material, and is attached to one of the first terminal portion and the first connection terminal portion,
When energized, the amount of heat generated in the first portion of the resistor located between the first terminal portion and the intermediate terminal portion of the resistor is greater than the amount of heat generated in the other portions of the resistor,
The first portion of the resistor is disposed in the central region of the resistance laminated member,
Speed control of a blower for an automobile, wherein portions of the first heat sink plate and the second heat sink plate located near the upper end of the central region and the side region of the resistance laminated member are fixed to each other by caulking. Resistance device.   One of the first heat sink plate and the second heat sink plate located near the upper end of the central region and the side region of the resistance laminated member is provided with a claw portion, and the other is provided with a mounting hole. The claw portion is inserted into the attachment hole, and the tip portion of the claw portion protruding from the attachment hole is bent, so that the first heat sink plate and the first heat sink plate positioned near the upper end of the central region and the side region of the resistance laminated member 2. The resistance device for controlling the speed of a blower for an automobile according to claim 1, wherein the two heat sink plates are fixed to each other.   The outer edge of the first heat sink plate, the outer edge of the second heat sink plate, or the outer edge of the first heat sink plate and the second heat sink plate is provided with a bead portion. The resistance device for speed control of the air blower for automobiles according to claim 1 or 2.   The resistance device for speed control of a blower for an automobile according to any one of claims 1 to 3, wherein the resistor is made of a Ni-Cr alloy. The end portion of the second heat sink plate corresponding to the end portion of the side region of the resistance laminated member is bent,
The mounting leg portion is provided so as to protrude from the lower end portion of the end portion of the bent second heat sink plate, and is inserted into a fixing hole portion provided in the mounting member. The resistance device for speed control of the blower for automobiles according to any one of claims 1 to 4.   6. The automobile blower according to claim 5, wherein a notch portion extending in parallel with the end portion of the second heat sink plate is provided at a lower portion of the end portion of the bent second heat sink plate. Resistance device for speed control.

Images