Resistor

Abstract

To provide a resistor which can be easily installed to a resistor body, and provides a terminal part which is hardly pulled off.SOLUTION: A resistor 100 comprises: a case 1 that is provided so as to be extended along a long direction; and a resistance element 2 that includes a resistor body 21 that is extended along the long direction and is housed in the case 1, and a pair of terminal parts 22 that is provided to each of both end parts of the resistor body 21 so that one part is projected from the case 1. Each terminal part 22 includes: a pair of nipping pieces 222 that nips a bottom side that is opposite to a bottom wall 11 of the case 1 of the resistor body 21 and a top side where the bottom surface of the resistor body 21 is faced in a back side; and a connection piece 223 that connects the pair of nipping pieces 222. On the bottom side and the top side of the resistor body 21, a coming-off preventive concave part 212f for preventing the pair of nipping pieces 222 from coming-off from the bottom surface or the top surface is formed. Each nipping piece 222 has an engagement piece 2222a that is partially entered into the coming-off preventive concave part 212f, and is engaged to the coming-off preventive concave part 212f.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a resistor. [Background technology]

[0002] Patent Document 1 discloses a resistor including a case, a resistive element having a resistive body accommodated in the case and terminal portions provided on both ends of the resistive body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP2019-169505A Summary of the Invention [Problem to be solved by the invention]

[0004] In the resistor described in Patent Document 1, in order to provide the terminal portion at the end of the resistor, a precise operation is required to form a hole in the end face of the resistor and insert the claw portion of the terminal portion into the hole. In addition, there is a problem that the claw portion of the terminal portion provided at the end of the resistor easily comes out of the hole.

[0005] The present invention has been made in consideration of this problem, and has an object to provide a resistor that is easy to install on a resistor element (insulator) and has terminal portions that are difficult to come loose. [Means for solving the problem]

[0006] According to one aspect of the present invention, a resistor is provided which comprises a resistance element having a case extending along the longitudinal direction, a resistor housed in the case so as to extend along the longitudinal direction, and a pair of terminal portions provided on each of both ends of the resistor so that a portion of the terminal portion protrudes from the case, wherein each terminal portion has a pair of clamping pieces which clamp the bottom side of the resistor facing the bottom wall of the case and the top side of the resistor facing away from the bottom side, and a connecting piece which connects the pair of clamping pieces, wherein a slip-out prevention recess is formed on the bottom side or the top side of the resistor to prevent the pair of clamping pieces from slipping out of the resistor, and each terminal portion is provided with an engaging portion which partially enters the slip-out prevention recess and engages with the slip-out prevention recess. Effect of the Invention

[0007] According to an aspect of the present invention, a resistor can be provided that is easy to install on a resistive element and has terminal portions that are difficult to come loose. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a resistor according to a first embodiment. [Diagram 2] FIG. 2 is a perspective view of a case and a fixed piece that constitute the resistor. [Diagram 3] FIG. 3 is a plan view of the resistor. [Figure 4] FIG. 4 is a perspective view of the terminal portion. [Diagram 5] FIG. 5 is a plan view of a resistor having terminal portions provided on both ends. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7] FIG. 7 is a plan view of the resistor according to the first embodiment, with the sealing material omitted. [Figure 8] FIG. 8 is a plan view of a terminal portion according to a modified example of the first embodiment. [Figure 9] FIG. 9 is a plan view of a resistor according to a modified example of the first embodiment. [Figure 10] FIG. 10 is a perspective view of a terminal portion according to the second embodiment. [Figure 11] FIG. 11 is a plan view of a resistor having terminal portions at both ends in the second embodiment. [Figure 12] FIG. 12 is a cross-sectional view taken along line XII-XII in FIG. [Figure 13] FIG. 13 is a plan view of a terminal portion according to a modified example of the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, a mode for carrying out the present invention (hereinafter, also simply referred to as an embodiment) will be described with reference to the attached drawings. In this specification, the same elements are given the same reference numerals throughout. In the drawings, the longitudinal direction, width direction, and height direction of the resistor 100 (case 1) are respectively defined as the direction along the X-axis, the direction along the Y-axis, and the direction along the Z-axis. Hereinafter, for convenience of explanation, the longitudinal direction, width direction, and height direction of the resistor 100 (case 1) will be simply referred to as the longitudinal direction, width direction, and height direction.

[0010] First, the configuration of a resistor 100 according to this embodiment will be described with reference to FIGS.

[0011] FIG. 1 is a perspective view of a resistor 100 according to this embodiment. FIG. 2 is a perspective view of a case 1 and a fixed piece 4 constituting the resistor 100. FIG. 3 is a plan view of a resistor 21. FIG. 4 is a perspective view of a terminal portion 22. FIG. 5 is a plan view of a resistor 21 provided with terminal portions 22 on both ends. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. FIG. 7 is a plan view of the resistor 100 according to the first embodiment, with the cement material (sealing material) 3 omitted.

[0012] 1 to 7, the resistor 100 according to this embodiment includes a metal case 1, a resistive element 2, a cement material 3 as a sealing material, and a metal fixing piece 4. In this embodiment, the resistor 100 is used as a pre-charge resistor for an electric vehicle, a hybrid vehicle (not shown), etc., in a state where it is mounted on a board or a cooler (not shown) as a mounting part through a screw (not shown) as a screwing member.

[0013] As shown in FIG. 2, the case 1 is a metal case extending along the longitudinal direction (X-axis direction). That is, the longitudinal dimension (size) of the case 1 is larger than the width direction (Y-axis direction). In this embodiment, the case 1 is configured to be octagonal in plan view. The case 1 has a bottom wall 11 formed in an octagonal shape in plan view, a peripheral wall portion 12 provided on the outer periphery of the bottom wall 11, a storage portion 13 surrounded by the bottom wall 11 and the peripheral wall portion 12, and two pairs of step portions 14 protruding from a top surface of the bottom wall 11 facing a resistance element 2 (specifically, a resistor 21 described later / see FIG. 3). In this embodiment, the case 1 is a flat type whose height direction (Z-axis direction) is smaller than its longitudinal and width directions.

[0014] As shown in FIG. 2, the peripheral wall portion 12 has a first peripheral wall 121 (121a, 121b) as a pair of side walls extending along the longitudinal direction, a second peripheral wall 122 (122a, 122b) as a pair of end walls extending along the width direction, a third peripheral wall 123 (123a, 123b) as a pair of connecting walls each connecting one end of the first peripheral wall 121a to one end of the second peripheral wall 122a and connecting the other end of the other first peripheral wall 121b to the other end of the other second peripheral wall 122b, and a fourth peripheral wall 124 (124a, 124b) as a pair of connecting walls each connecting the other end of the first peripheral wall 121a to one end of the other second peripheral wall 122b and connecting one end of the other first peripheral wall 121b to the other end of the second peripheral wall 122a.

[0015] As shown in Fig. 2, the two pairs of step portions 14 are provided so as to be connected to the pair of third peripheral walls 123 (123a, 123b) and the pair of fourth peripheral walls 124 (124a, 124b), respectively. The two pairs of step portions 14 are also arranged along the width direction. The two pairs of step portions 14 are formed so that their thickness in the height direction is larger than the diameter of a resistance wire 23 (see Fig. 7) described later.

[0016] This makes it possible to prevent the resistance wire 23 wound around the resistor 21 (specifically, the bottom surface of the winding core 211 described later) from coming into contact with the bottom wall 11 of the case 1 when the resistor 21 (specifically, a pair of terminal installation portions 212 described later) is placed on the two pairs of step portions 14, thereby ensuring insulation of the resistor element 2 from the bottom wall 11 of the case 1 without providing an insulating plate between the resistor element 2 and the bottom wall 11. As a result, the insulation of the resistor element 2 can be ensured while reducing the number of parts constituting the resistor 100.

[0017] As shown in Fig. 1, Fig. 2 and Fig. 7, the pair of fixing pieces 4 (4a, 4b) are integrally formed with the case 1 so as to sandwich the case 1 in a plan view. In the present embodiment, the pair of fixing pieces 4 (4a, 4b) are formed so as to be connected to both the pair of third peripheral walls 123 (123a, 123b) and the pair of second peripheral walls 122 (122a, 122b). However, the pair of fixing pieces 4 (4a, 4b) is not limited thereto, and may be formed so as to be connected to only the pair of third peripheral walls 123 (123a, 123b), for example.

[0018] Moreover, the pair of fixing pieces 4 (4a, 4b) are molded integrally with the bottom wall 11 of the case 1. The pair of fixing pieces 4 (4a, 4b) are formed so that the thickness in the height direction coincides with the thickness of the bottom wall 11.

[0019] A pair of fixing holes 5 (5a, 5b) penetrating the pair of fixing pieces 4 (4a, 4b) are formed in the pair of fixing pieces 4 (4a, 4b), respectively. The pair of fixing holes 5 (5a, 5b) are for inserting screws therethrough.

[0020] As shown in Figure 7, the resistance element 2 has a resistor 21 accommodated in the accommodating section 13 of the case 1 via cement material 3 (see Figure 1) so as to extend along the longitudinal direction, a pair of terminal portions 22 provided at both ends of the resistor 21 so as to protrude partially from the accommodating section 13 of the case 1, and a metallic resistance wire 23 wound around the resistor 21.

[0021] The resistor 21 is a flat insulator that is generally octagonal in shape and is made of an insulating material such as ceramics. This improves the pulse resistance, making it possible to handle high voltages and reducing the overall thickness and weight of the resistor 100.

[0022] As shown in FIG. 3, the resistor 21 has a winding core 211 around which the resistance wire 23 is wound and which is formed into a rectangular shape in cross section, and a pair of terminal installation portions 212 as both ends of the resistor 21 provided at both ends of the winding core 211 in the longitudinal direction so as to sandwich the winding core 211 along the longitudinal direction.

[0023] The winding core 211 and the pair of terminal installation portions 212 are integrally formed such that the top surfaces of both located on the top side of resistor 21 and the bottom surfaces of both located on the bottom side of resistor 21 are flush with each other. Here, the top side of resistor 21 is the side facing away from bottom wall 11 of case 1, and the bottom side of resistor 21 is the side facing bottom wall 11.

[0024] In order to facilitate winding the resistance wire 23 around the winding core 211, the four corners of the winding core 211 are chamfered or rounded in cross section. As shown in Fig. 7, when the resistor 21 is accommodated in the accommodation section 13 via the cement material 3, a pair of gaps S are formed between the side planes 211a as a pair of side surfaces of the winding core 211 and the inner surfaces of the pair of first peripheral walls 121. As a result, during the manufacture of the resistor 100, the cement material 3 is likely to flow around the outer periphery of the resistor 21 through the pair of gaps S present between the pair of side planes 211a and the pair of first peripheral walls 121, and air is likely to escape, which contributes to the heat dissipation of the entire resistor 100.

[0025] 3 and 7, each terminal installation portion 212 of the resistor 21 is configured to be substantially trapezoidal in plan view, and has a pair of first opposing portions 212a facing the pair of first peripheral walls 121 of the case 1, a pair of second opposing portions 212b facing the pair of second peripheral walls 122 of the case 1, opposing flat surfaces 212c as a pair of third opposing portions that connect the pair of first opposing portions 212a and the pair of second opposing portions 212b and are inclined relative to the pair of side flat surfaces 211a in plan view, a recess 212d located between the pair of second opposing portions 212b and recessed from the second opposing portion 212b along the longitudinal direction, and a pair of accommodating recesses 212e recessed from both the top surface and the bottom surface of the terminal installation portion 212. The recess 212d and the pair of accommodating recesses 212e are accommodating areas for accommodating clips of the terminal portion 22, which will be described later.

[0026] 7, the pair of first opposing portions 212a are provided extending along the longitudinal direction. The winding core 211 is provided such that the pair of side planes 211a face the pair of first circumferential walls 121 and are recessed along the width direction from each of the pair of first opposing portions 212a of the terminal installation portion 212. In other words, the pair of first opposing portions 212a are provided so as to protrude from the pair of side planes 211a, respectively. That is, a step is formed between each of the pair of side planes 211a and each of the pair of first opposing portions 212a.

[0027] In this way, the terminal installation portions 212 provided at both ends of the winding core 211 have a pair of first opposing portions 212a protruding from a pair of side planes 211a, and thus, compared to a case in which the pair of first opposing portions are provided on the winding core 211 rather than on the terminal installation portion 212, it is possible to ensure both a winding region for winding the resistance wire 23 around the winding core 211 and ease of winding. In particular, the resistance wire 23 is wound around the winding core 211 so that the ends (specifically, the pair of ends of the resistance wire 23 welded to the terminal portion 22) are inclined with respect to the width direction in a plan view and come into contact with the top surface of the terminal installation portion 212 (specifically, the region of the top surface of the terminal installation portion 212 excluding the accommodating recess 212e). Therefore, the winding direction of the resistance wire 23 can be changed without applying a load to the resistance wire 23.

[0028] The resistance wire 23 is wound around the pair of side flat surfaces 211a so as not to come into contact with the pair of first peripheral walls 121. In other words, the step is formed so that its dimension (i.e., the amount of recess or protrusion) is larger than the diameter of the resistance wire 23. This ensures insulation of the resistance element 2 from the first peripheral wall 121 of the case 1 without providing an insulating plate between the side flat surfaces 211a and the first peripheral wall 121. As a result, it is possible to ensure insulation of the resistance element 2 while reducing the number of parts constituting the resistor 100.

[0029] In this embodiment, even in a high voltage (e.g., 800V) specification, the dimension (i.e., thickness) of the step is set to 0.8 mm or more, and preferably 1 mm or more, from the viewpoint of ensuring insulation against the first peripheral wall 121 of the case 1. When the dimension of the step is 1 mm or more, the diameter of the resistance wire 23 is set to a maximum of 0.9 mm.

[0030] As shown in Fig. 7, the pair of second opposing portions 212b are provided extending along the width direction. The recessed portion 212d is located at the center in the width direction of the terminal installation portion 212. The pair of recessed portions 212d are provided so that the pair of terminal portions 22 (specifically, the connection pieces 223 described later / see Fig. 4) do not come into contact with the pair of second circumferential walls 122. In other words, the recessed portion 212d is formed so that the recessed amount is larger than the thickness of the terminal portions 22 (specifically, the connection pieces 223).

[0031] This ensures insulation of the resistance element 2 with respect to the second peripheral wall 122 of the case 1 without providing an insulating plate between the second opposing portion 212b and the second peripheral wall 122. As a result, the insulation of the resistance element 2 can be ensured while reducing the number of parts.

[0032] The pair of step portions 14 place the terminal installation portion 212 on either side of the recess 212d in the width direction. In other words, the recess 212d is located between the pair of step portions 14 in a plan view. This makes it possible to prevent the connection piece 223 of the terminal portion 22 provided in the recess 212d from coming into contact with the step portion 14, thereby ensuring insulation of the resistance element 2 from the case 1.

[0033] 7, the two pairs of opposing flat surfaces 212c are provided so as to be able to abut against the pair of third peripheral walls 123 and the pair of fourth peripheral walls 124, respectively. This makes it possible to easily position the resistor 21 relative to the case 1 in the longitudinal and width directions simply by abutting the pair of opposing flat surfaces 212c against the third peripheral wall 123 and the fourth peripheral wall 124.

[0034] As shown in FIG. 7, when the pair of opposing flat surfaces 212c abut against the third circumferential wall 123 and the fourth circumferential wall 124, the pair of first opposing portions 212a are each spaced apart from the first circumferential wall 121, and the pair of second opposing portions 212b are each spaced apart from the second circumferential wall 122.

[0035] As shown in FIG. 3, each of the accommodating recesses 212e is formed to extend along the longitudinal direction so as to communicate with the recess 212d. Each of the accommodating recesses 212e is formed in a rectangular shape in a plan view. The pair of accommodating recesses 212e on the top and bottom surfaces of the terminal installation portion 212 accommodates the terminal portion 22 (specifically, a pair of clamping pieces 222 of the terminal portion 22, which will be described later; see FIG. 4). The accommodating recess 212e on the bottom surface of the terminal installation portion 212 is sandwiched between a pair of step portions 14 along the width direction. In other words, the accommodating recess 212e on the bottom surface of the terminal installation portion 212 and the pair of step portions 14 are provided to overlap along the longitudinal direction. This makes it possible to prevent the other clamping piece 222b accommodated in the accommodating recess 212e on the bottom surface of the terminal installation portion 212 from contacting the step portion 14, thereby ensuring insulation of the resistance element 2 from the case 1.

[0036] 3, the pair of accommodating recesses 212e are sandwiched between the pair of first opposing portions 212a in the width direction. In other words, the pair of accommodating recesses 212e and the pair of first opposing portions 212a are provided so as to overlap in the longitudinal direction. This allows the longitudinal dimension of the terminal installation portion 212 to be smaller than when the pair of accommodating recesses and the pair of first opposing portions are provided so as not to overlap in the longitudinal direction, and therefore allows the longitudinal dimension of the winding core 211 to be relatively larger. As a result, the winding area of ​​the winding core 211 around which the resistance wire 23 is wound can be expanded.

[0037] 3, each accommodating recess 212e is formed with a pair of fall-off prevention recesses 212f arranged along the width direction. That is, the pair of fall-off prevention recesses 212f is concentrated in each accommodating recess 212e. This allows the dimensions (i.e., size) of the terminal portion 22 to be smaller than when the pair of fall-off prevention recesses 212f is directly formed on the top and bottom surfaces of the terminal installation portion 212 where the accommodating recesses 212e are not formed.

[0038] 7, the pair of slip-out prevention recesses 212f are recesses for preventing the terminal portion 22 (specifically, the pair of clamping pieces 222) from slipping out of the resistor 21 (specifically, the terminal installation portion 212). A predetermined distance is provided between the pair of slip-out prevention recesses 212f. In this embodiment, the pair of slip-out prevention recesses 212f are formed in a rectangular shape in a plan view, and are formed closer to the recess 212d side than to the winding core 211 side in the longitudinal direction.

[0039] In the present embodiment, the accommodating recesses 212e are formed on both the top surface and the bottom surface of the terminal installation portion 212, but this is not limiting and, for example, the accommodating recesses 212e may be formed on either the top surface or the bottom surface of the terminal installation portion 212. In this case, a pair of slip-out prevention recesses 212f are directly formed on the other of the top surface and the bottom surface of the terminal installation portion 212 on which the accommodating recesses 212e are not formed.

[0040] As shown in Fig. 7, the pair of terminal portions 22 are arranged in the longitudinal direction and are respectively provided in the pair of terminal installation portions 212. As shown in Fig. 4, each terminal portion 22 has a terminal piece 221 (see Fig. 7) that extends in the height direction and serves as a part protruding from the storage portion 13 (cement material 3) of the case 1, a pair of clamping pieces 222 (222a, 222b) that clamp the top and bottom sides of the terminal installation portion 212, and a connection piece 223 that connects the pair of clamping pieces 222.

[0041] The terminal piece 221, the pair of clamping pieces 222, and the connection piece 223 are formed by cutting and bending a single elastic metal plate (e.g., copper, etc.) having a uniform thickness. This makes it possible to easily form the terminal portion 22.

[0042] 3 and 6, one end of one clamping piece 222a is connected to one end of the other clamping piece 222b by a connection piece 223. In contrast, the other end of one clamping piece 222a is connected to the base end of the terminal piece 221.

[0043] 3 and 6, the pair of clamping pieces 222 and the connecting piece 223 form a clip that is substantially U-shaped in side view or vertical cross section. This allows the terminal portion 22 (specifically, the clip of the terminal portion 22) to be easily provided in the terminal installation portion 212 (specifically, the accommodation region of the terminal installation portion 212) by inserting the pair of clamping pieces 222 into the pair of accommodating recesses 212e so that the opening of the clip faces the recess 212d and the connecting piece 223 approaches the bottom surface of the recess 212d (i.e., the end surface of the resistor 21 / the end surface of the terminal installation portion 212) along the longitudinal direction.

[0044] As shown in Figures 3 and 6, when the terminal portion 22 is provided in the terminal installation portion 212, one clamping piece 222a and the other clamping piece 222b clamp the terminal installation portion 212 so that it is accommodated in a pair of accommodating recesses 212e on the top and bottom surfaces of the terminal installation portion 212, respectively.

[0045] In this embodiment, the thickness of the pair of clamping pieces 222 (i.e., the thickness of the metal plate) is equal to the recessed amount of the pair of accommodating recesses 212e. As a result, one of the clamping pieces 222a accommodated in the accommodating recess 212e is flush with the top surface of the terminal installation portion 212, so that the end of the resistance wire 23 can be placed on both the top surface of the terminal installation portion 212 and the clamping piece 222a without applying excessive force. As a result, the load in the peeling direction (direction perpendicular to the upper surface of the clamping piece 222a / i.e., height direction) on the welding point where the end of the resistance wire 23 and one of the clamping pieces 222a are welded can be reduced.

[0046] As shown in Figures 3 and 6, when the terminal portion 22 is provided in the terminal installation portion 212, one of the clamping pieces 222a that clamps the accommodating recess 212e has a pair of engaging pieces 2222a as engaging portions that partially enter the anti-slip recess 212f formed in the accommodating recess 212e and engage with the anti-slip recess 212f.

[0047] As a result, when terminal portion 22 (specifically, the clip of terminal portion 22) attempts to come out of terminal installation portion 212 (specifically, the storage area of ​​terminal installation portion 212), engagement piece 2222a that has entered anti-slip recess 212f abuts against anti-slip recess 212f, thereby preventing terminal portion 22 (specifically, the clip of terminal portion 22) from coming out of terminal installation portion 212 (specifically, the storage area of ​​terminal installation portion 212).

[0048] Furthermore, since the pair of engaging pieces 2222a are provided on the clamping side of one of the clamping pieces 222a, the clip of the terminal portion 22 is less likely to come out of the accommodation area of ​​the terminal installation portion 212 compared to a pair of engaging pieces provided on a part that does not have a clamping function (e.g., terminal piece 221).

[0049] 3, one of the clamping pieces 222a further has a clamping piece main body 2221a connected to the connection piece 223. The pair of engagement pieces 2222a has a connection region 2222b that is not connected to the connection piece 223 and is connected to the clamping piece main body 2221a, and a bending region 2222c in which a notch is formed between the clamping piece main body 2221a and the connection region 2222b.

[0050] 3, the pair of engaging pieces 2222a are arranged in the width direction so as to sandwich the clamping piece main body 2221a. The connection region 2222b and the bending region 2222c are arranged in the longitudinal direction so that the bending region 2222c is located between the connection region 2222b and the recess 212d.

[0051] As shown in FIG. 6, the bending region 2222c of the engagement piece 2222a is bent toward the anti-slip recess 212f so that its tip as an outer edge facing the second peripheral wall 122 can abut against the vertical wall 212g (i.e., the vertical wall 212g formed closer to the recess 212d side than to the winding core 211 side in the longitudinal direction) adjacent to the end face of the resistor 21 of the anti-slip recess 212f.

[0052] As a result, when the terminal portion 22 (specifically, the clip) attempts to come out of the terminal installation portion 212, the tip of the bent bending region 2222c abuts against the standing wall 212g, thereby preventing the terminal portion 22 from coming out of the terminal installation portion 212.

[0053] As described above, the pair of slip-out prevention recesses 212f are formed in the longitudinal direction closer to the recess 212d than to the winding core 211. This makes it possible to prevent the longitudinal dimension of the engaging piece 2222a from becoming too small, making it difficult to form the engaging piece 2222a, as compared to a case in which the pair of slip-out prevention recesses 212f are formed in the longitudinal direction closer to the winding core 211 than to the recess 212d.

[0054] In this embodiment, the engagement portion is composed of a pair of engagement pieces 2222a, but is not limited to this and may be composed of, for example, a single engagement piece 2222a arranged with the clamping piece main body 2221a along the width direction.

[0055] In addition, in this embodiment, the engagement piece 2222a is provided on the clamping piece 222a having a clamping function, but this is not limited to this, and for example, the engagement piece 2222a may be provided on a terminal piece 221 that does not have a clamping function.

[0056] Moreover, the other clamping piece 222b is similar to the one clamping piece 222a, and therefore a description thereof will be omitted.

[0057] In this embodiment, the engaging piece 2222a is provided on the pair of clamping pieces 222, but is not limited thereto, and may be provided on, for example, one of the clamping pieces 222. In this case, it is sufficient that the slip-out prevention recess 212f is formed only on the side on which the engaging piece 2222a is provided.

[0058] 6, the connection piece 223 is provided so as to be able to come into contact with the bottom surface of the recess 212d, which makes it possible to easily position the terminal portion 22 relative to the terminal installation portion 212 in the longitudinal direction.

[0059] Furthermore, the thickness of the connection piece 223 (i.e., the thickness of the metal plate) is smaller than the recess amount of the recess 212d. This makes it possible to prevent the connection piece 223, which is in contact with the bottom surface of the recess 212d, from protruding from the second opposing portion 212b, and therefore to prevent the connection piece 223 from contacting the second peripheral wall 122. As a result, the insulation of the resistance element 2 from the second peripheral wall 122 of the case 1 can be ensured.

[0060] (Modification of the first embodiment) Next, a resistor 100 according to a modification of the first embodiment will be described with reference to Fig. 8 and Fig. 9. In the modification of the first embodiment, the points that are the same as those in the first embodiment described above will be omitted, and the points that are different from the first embodiment described above will be mainly described.

[0061] Fig. 8 is a plan view of a terminal portion 22 according to a modification of the first embodiment. Fig. 9 is a plan view of a resistor 21 according to a modification of the first embodiment.

[0062] In the above-described first embodiment, the engagement portion is configured from a pair of engagement pieces 2222a, but is not limited to this and may be configured from, for example, a single engagement piece 2222a as shown in FIG.

[0063] In this case, as shown in Fig. 8, the engagement piece 2222a is surrounded by the clamping piece main body 2221a. The engagement piece 2222a has a connection region 2222b connected to the clamping piece main body 2221a, and a bending region 2222c in which a substantially U-shaped notch is formed between the engagement piece 2222a and the clamping piece main body 2221a.

[0064] 9, the single slip-out prevention recess 212f is formed in the center in the width direction of the accommodating recess 212e. Then, in a state in which the clip of the terminal portion 22 is accommodated in the accommodating region of the terminal installation portion 212, such a single engaging piece 2222a is provided such that the bending region 2222c enters the single slip-out prevention recess 212f and engages with the single slip-out prevention recess 212f.

[0065] This makes it possible to prevent the terminal portion 22 from coming off the terminal installation portion 212, and to reduce the dimension (size) in the width direction of the terminal portion 22 and the accommodating recess 212e.

[0066] Second embodiment Next, a resistor 100 according to a second embodiment will be described with reference to Fig. 10 to Fig. 12. Note that in the second embodiment, points common to the first embodiment described above will be omitted, and points different from the first embodiment described above will be mainly described.

[0067] Fig. 10 is a perspective view of a terminal portion 22 in the second embodiment. Fig. 11 is a plan view of a resistor 21 in which a terminal portion 22 is provided on a terminal installation portion 212 in the second embodiment. Fig. 12 is a cross-sectional view taken along line XII-XII in Fig. 11.

[0068] In the first embodiment described above, the engagement portion is composed of a pair of engagement pieces 2222a connected to the clamping piece main body 2221a, but is not limited to this and, for example, as shown in Figure 10, is composed of a pair of engagement pieces 2222A that are not connected to the clamping piece main body 2221a but are connected to the connection piece 223.

[0069] In this case, as shown in FIG. 10, the pair of engagement pieces 2222A are provided to sandwich the clamping piece main body 2221a along the width direction. Also, a notch is formed between the pair of engagement pieces 2222A and the clamping piece main body 2221a. Also, as shown in FIG. 10 to FIG. 12, the pair of engagement pieces 2222A each have a pair of protrusions 2222D that enter into and engage with the fall-off prevention recesses 212f. This provides the same effect as the engagement pieces 2222a of the first embodiment. In the second embodiment, the protrusions 2222D are formed by pressing.

[0070] In the second embodiment, as shown in FIG. 11, a pair of slip-out prevention recesses 212f are formed directly on the top and bottom surfaces of the terminal installation portion 212, closer to the winding core 211 side than the recesses 212d side in the longitudinal direction.

[0071] In the second embodiment, the pair of engagement pieces 2222A have a clamping function, but this is not limiting, and for example, they may be provided without having a clamping function.

[0072] (Modification of the second embodiment) Next, a resistor 100 according to a modification of the second embodiment will be described with reference to Fig. 13. Note that in the modification of the second embodiment, points that are the same as those in the above-mentioned second embodiment will be omitted, and points that differ from the above-mentioned second embodiment will be mainly described.

[0073] FIG. 13 is a plan view of a terminal portion 22 according to a modified example of the second embodiment.

[0074] In the above-described second embodiment, the protrusions 2222D are provided on the pair of engaging pieces 2222A, but this is not limiting, and for example, as shown in FIG. 13, the protrusions 2222D may be provided on the clamping piece main body 2221a.

[0075] 13, the terminal portion 22 does not have a pair of engagement pieces, which makes it possible to prevent the terminal portion 22 from coming off the terminal installation portion 212 and to reduce the dimension (size) of the terminal portion 22 in the width direction.

[0076] (Action and effect) Next, the effects of each embodiment and each modified example will be described.

[0077] The resistor 100 of the first embodiment comprises a case 1 extending along the longitudinal direction, a resistor 21 housed in the case 1 so as to extend along the longitudinal direction, and a resistance element 2 having a pair of terminal portions 22 provided at both ends of the resistor 21 so as to protrude partially from the case 1, and each terminal portion 22 has a pair of clamping pieces 222 that clamp the bottom side of the resistor 21 facing the bottom wall of the case 1 and the top side of the resistor 21 facing away from the bottom side, and a connection piece 223 that connects the pair of clamping pieces 222, and a slip-out prevention recess 212f is formed on the bottom side or top side of the resistor 21 to prevent the pair of clamping pieces 222 from slipping out of the resistor 21, and each terminal portion 22 is provided with an engagement piece 2222a that partially enters the slip-out prevention recess 212f and engages with the slip-out prevention recess 212f.

[0078] In the first embodiment, the resistance element 2 further has a resistance wire 23, and the resistor 21 has a winding core 211 around which the resistance wire 23 is wound and which is formed into a rectangular shape in a cross-sectional view, and a pair of terminal installation portions 212 provided on both ends of the winding core 211, respectively, and both ends of the resistor 21 are the pair of terminal installation portions 212.

[0079] In the first embodiment, the case 1 is a flat type in which the dimension in the height direction is smaller than the dimensions in the longitudinal direction and width direction.

[0080] According to these configurations, when terminal portion 22 (specifically, the clip of terminal portion 22) attempts to come out of terminal installation portion 212 (specifically, the storage area of ​​terminal installation portion 212), engagement piece 2222a that has entered anti-slip recess 212f abuts against anti-slip recess 212f, thereby preventing terminal portion 22 (specifically, the clip of terminal portion 22) from coming out of terminal installation portion 212 (specifically, the storage area of ​​terminal installation portion 212).

[0081] Furthermore, by inserting a pair of clamping pieces 222 into the top and bottom sides of terminal installation portion 212 so that the opening of the clip faces toward recess 212d and the connection piece 223 is brought close to the bottom surface of recess 212d (i.e., the end face of resistor 21 / end face of terminal installation portion 212) along the longitudinal direction, terminal portion 22 (specifically, the clip of terminal portion 22) can be easily provided in terminal installation portion 212 (specifically, the accommodating area of ​​terminal installation portion 212).

[0082] In summary, these configurations make it possible to provide resistor 100 that is easy to install on resistive element 21 and has terminal portion 22 that is difficult to come loose.

[0083] In the first embodiment, the connection piece 223 is provided so as to be able to come into contact with the end face of the resistor 21.

[0084] This configuration makes it possible to easily determine the longitudinal position of the terminal portion 22 relative to the resistor 21 (specifically, the terminal installation portion 212 of the resistor 21).

[0085] In addition, in the first embodiment, one of the clamping pieces 222a further has an engagement piece 2222a having a clamping piece main body 2221a connected to the connection piece 223, a connection region 2222b that is not connected to the connection piece 223 and is connected to the clamping piece main body 2221a, and a bending region 2222c in which a notch is formed between the clamping piece main body 2221a and the engagement piece 2222a, and the tip of the bending region 2222c is bent toward the anti-slip recess 212f so as to be able to abut against the vertical wall 212g adjacent to the end face of the resistor 21 of the anti-slip recess 212f.

[0086] According to this configuration, when the terminal portion 22 (specifically, the clip) attempts to come out of the terminal installation portion 212, the tip of the bent bending region 2222c abuts against the standing wall 212g, thereby preventing the terminal portion 22 from coming out of the terminal installation portion 212.

[0087] Furthermore, since the pair of engaging pieces 2222a are provided on the clamping side of one of the clamping pieces 222a, the clip of the terminal portion 22 is less likely to come out of the accommodation area of ​​the terminal installation portion 212 compared to a pair of engaging pieces provided on a part that does not have a clamping function (e.g., terminal piece 221).

[0088] In the first embodiment, the engaging portion has a pair of engaging pieces 2222a that sandwich the clamping piece main body 2221a along the width direction perpendicular to the longitudinal direction.

[0089] According to this configuration, the clip of the terminal portion 22 is less likely to come out of the housing area of ​​the terminal installation portion 212, as compared to when the engagement portion is composed of a single engagement piece 2222a.

[0090] In the modified example of the first embodiment, the engaging portion has an engaging piece 2222a surrounded by a clamping piece main body 2221a.

[0091] According to this configuration, the dimension (size) of the terminal portion 22 in the width direction can be reduced.

[0092] In addition, in the second embodiment, one of the clamping pieces 222a further has a clamping piece main body 2221a connected to the connecting piece 223, and the engaging piece 2222A is not connected to the clamping piece main body 2221a but is connected to the connecting piece 223, a notch is formed between the engaging piece 2222A and the clamping piece main body 2221a, and the engaging piece 2222A has a protrusion 2222D that fits into the anti-slip recess 212f.

[0093] According to this configuration, when terminal portion 22 (specifically, clip) tries to come off terminal installation portion 212, protrusion 2222D comes into contact with standing wall 212g, so that terminal portion 22 can be prevented from coming off terminal installation portion 212.

[0094] In the second embodiment, the engaging portion has a pair of engaging pieces 2222A that sandwich the clamping piece main body 2221a along the width direction perpendicular to the longitudinal direction.

[0095] According to this configuration, the clip of the terminal portion 22 is less likely to come out of the housing area of ​​the terminal installation portion 212, as compared to when the engagement portion is composed of a single engagement piece 2222a.

[0096] In the modified example of the second embodiment, one clamping piece 222a further has a clamping piece main body 2221a connected to the connection piece 223, and the engagement portion has a protrusion 2222D formed on the clamping piece main body 2221a and fitted into the slip-out prevention recess 212f.

[0097] According to this configuration, the dimension (size) of the terminal portion 22 in the width direction can be reduced.

[0098] In addition, in the first embodiment, an accommodating recess 212e for accommodating a pair of clamping pieces 222 is formed on the bottom surface located on the bottom side or the top surface located on the top side at both ends of the resistor 21, and a slip-out prevention recess 212f is formed in the accommodating recess 212e.

[0099] According to this configuration, the dimensions (i.e., size) of the terminal portion 22 can be made smaller than in a case where a pair of anti-slip recesses 212f are formed directly on the top and bottom surfaces of the terminal installation portion 212 where the accommodating recess 212e is not formed.

[0100] The pair of clamping pieces 222 and the connecting piece 223 are formed by bending a single metal plate.

[0101] According to this configuration, the terminal portion 22 can be easily formed.

[0102] Although the above describes each embodiment and each modified example, the above embodiments and modified examples merely illustrate some of the application examples of the present invention, and are not intended to limit the technical scope of the present invention to the specific configurations of the above embodiments. [Explanation of symbols]

[0103] 1 case 2. Resistance element 21 Resistor 22 Terminal section 212f Recessed hole to prevent slipping out 222 Clamping piece 223 Connection piece 100 resistor 2222a Engagement piece (engagement part)

Claims

1. A case extending along a longitudinal direction; a resistor element including a resistor housed in the case so as to extend along the longitudinal direction, and a pair of terminal portions provided at both ends of the resistor so as to partially protrude from the case, Each terminal is a pair of clamping pieces for clamping a bottom side of the resistor facing the bottom wall of the case and a top side of the resistor facing away from the bottom side; A connection piece that connects the pair of clamping pieces, A slip-out prevention recess is formed on the bottom side or the top side of the resistor body to prevent the pair of clamping pieces from slipping out of the resistor body, Each terminal portion is provided with an engagement portion that partially enters into the fall-off prevention recess and engages with the fall-off prevention recess. resistor.

2. The connection piece is provided so as to be able to come into contact with an end surface of the resistor.

2. The resistor of claim 1.

3. At least one of the clamping pieces is A clamping piece body connected to the connecting piece; The engaging portion further includes a connection region that is not connected to the connecting piece and is connected to the clamping piece body, and a bending region in which a notch is formed between the connecting piece and the clamping piece body, the engaging portion is bent toward the pull-out prevention recess so that an outer edge of the bending region can come into contact with a standing wall of the pull-out prevention recess that is close to an end surface of the resistor; 2. The resistor of claim 1.

4. The engaging portion has a pair of engaging pieces that sandwich the clamping piece body along a width direction perpendicular to the longitudinal direction, 4. The resistor of claim 3.

5. The engaging portion has an engaging piece surrounded by the clamping piece main body.

4. The resistor of claim 3.

6. At least one of the clamping pieces is Further, the clamping piece body is connected to the connecting piece, The engaging portion is not connected to the clamping piece main body, but is connected to the connecting piece, A notch is formed between the engaging portion and the clamping piece body, The engagement portion has a protrusion that fits into the fall-off prevention recess.

2. The resistor of claim 1.

7. The engaging portion has a pair of engaging pieces that sandwich the clamping piece body along a width direction perpendicular to the longitudinal direction, 7. The resistor of claim 6.

8. At least one of the clamping pieces is Further, the clamping piece body is connected to the connecting piece, The engaging portion has a protrusion formed on the clamping piece body and adapted to fit into the fall-off prevention recess.

3. The resistor of claim 2.

9. A bottom surface located on the bottom side or a top surface located on the top side at both ends of the resistor is formed with an accommodating recess for accommodating a pair of the clamping pieces, The slip-out prevention recess is formed in the accommodation recess.

2. The resistor of claim 1.

10. The pair of clamping pieces and the connecting piece are formed by bending a single sheet metal.

2. The resistor of claim 1.

11. The resistive element further includes a resistive wire, The resistor is A winding core around which the resistance wire is wound and which is formed into a rectangular shape in cross section; A pair of terminal installation portions provided at both ends of the winding core, having Both ends of the resistor are a pair of the terminal installation portions.

2. The resistor of claim 1.

12. The case is a flat type in which the dimensions in the longitudinal direction, the width direction perpendicular to the longitudinal direction, and the height direction perpendicular to the width direction are smaller than the dimensions in the longitudinal direction and the width direction. A resistor according to any one of claims 1 to 11.

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