crimping terminal

Abstract

The present invention provides a crimp terminal that stably reduces the resistance of the crimping portion. It includes a conductor crimp portion, which is configured to include a base plate containing a conductor on which an electrical wire is disposed, and a pair of conductor fastening tabs extending from both sides of the base plate. By covering and fastening the conductor with the conductor fastening tabs, the conductor is crimped and connected to the conductor. The conductor crimp portion has fine teeth extending in a groove shape along a direction intersecting the extension direction of the conductor disposed on the base plate. In the unfolded state before the conductor crimp portion is crimped onto the conductor, the width (Sa) of the opening of the fine teeth is greater than or equal to the width (Sb) of the bottom surface (32) of the fine teeth (30). Furthermore, the angle (θ2) between the side surface (33) located at at least a portion of the conductor fastening tab (21) and the normal (L) of the bottom surface (32) is greater than the angle (θ1) between the side surface (33) located at the bottom surface (32) of the portion of the base plate (15).

Description

Technical Field

[0001] This invention relates to crimp terminals. Background Technology

[0002] A typical crimp terminal for crimping wires has a conductor crimping portion that is crimped against the conductor of the wire exposed at the end of the wire by fastening. The conductor crimping portion of the crimp terminal may include, for example, a base plate and plate-shaped conductor fastening tabs located on both sides of the base plate in a direction orthogonal to the extension direction of the wire and extending from the base plate. When the wire is placed on the base plate, the conductor fastening tabs on both sides of the base plate cover and fasten the wire, thereby crimping it to the wire.

[0003] Furthermore, in existing crimp terminals, there is a structure in which fine teeth are formed on the contact surface of the crimp terminal that contacts the conductor of the wire. For example, in Patent Documents 1 and 2, fine teeth are formed on the contact surface of the crimp terminal that contacts the conductor of the wire, consisting of a plurality of grooves extending in a direction orthogonal to the extension direction of the wire. This reduces the resistance at the crimping portion of the crimp terminal, i.e., the resistance of the crimping portion.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2010-198789

[0007] Patent Document 2: Japanese Patent Application Publication No. 2010-244889 Summary of the Invention

[0008] The technical problem that the invention aims to solve

[0009] However, in the aforementioned crimp terminals, for the fine teeth, when the crimp terminal is crimped to the wire, the conductor of the wire enters the groove of the fine teeth due to the force during crimping, and the contact area between the conductor and the crimp terminal increases, thereby reducing the resistance of the crimp section. However, in this fine tooth, there is room for further improvement in the structure for more stably reducing the resistance of the crimp section.

[0010] The present invention was made in view of the above circumstances, and its object is to provide a crimp terminal that can stably reduce the resistance of the crimp portion.

[0011] Technical means for solving problems

[0012] To solve the above problems and achieve the objective, the crimp terminal of the present invention is characterized by having a conductor crimping portion, which is configured to include: a base plate on which a conductor of an electrical wire is disposed; and a pair of conductor fastening tabs, which extend from both sides of the base plate in a direction intersecting the extending direction of the conductor. By covering and fastening the conductor disposed on the base plate with the conductor fastening tabs, the conductor crimping portion is crimped and connected to the conductor of the electrical wire. The surface of the conductor crimping portion in contact with the conductor has fine teeth formed. The fine teeth extend in a groove shape across a pair of conductor fasteners and the base plate in a direction intersecting the extension direction of the conductor disposed on the base plate. In the flat, unfolded state before the conductor crimping portion is crimped onto the conductor, the width of the opening of the fine teeth along the extension direction is greater than the width of the bottom surface of the fine teeth along the extension direction. Furthermore, the angle between the side surface of the fine teeth located at at least a portion of the conductor fastener portion and the normal to the bottom surface is greater than the angle between the side surface of the fine teeth located on the base plate portion and the normal to the bottom surface.

[0013] Invention Effects

[0014] In the crimp terminal of the present invention, when the fine teeth formed in the conductor crimp portion are in an unfolded state (flat plate shape), the angle of the side surface at at least a portion of the conductor fastening piece is greater than the angle of the side surface of the portion located on the base plate. Therefore, even when the conductor crimp portion is pressed onto the conductor by fastening the conductor fastening piece, it is possible to prevent the width of the opening of the fine teeth in the portion located on the conductor fastening piece from being smaller than the width of the bottom surface of the fine teeth. This allows the portion of the conductor adjacent to the conductor fastening piece to easily enter the fine teeth. When the conductor fastening piece is fastened and the conductor crimp portion is pressed onto the conductor, the conductor enters the fine teeth, thereby increasing the contact area between the conductor and the crimp terminal and reducing resistance. As a result, it achieves the effect of stably reducing the resistance of the crimp portion. Attached Figure Description

[0015] Figure 1 This is a perspective view of the crimp terminal involved in the implementation method.

[0016] Figure 2 yes Figure 1 The diagram shows the conductor crimped portion in its unfolded state.

[0017] Figure 3 yes Figure 2 AA sectional view.

[0018] Figure 4 yes Figure 2 BB cross-sectional view.

[0019] Figure 5 This is an explanatory diagram showing the state before the crimp terminal is crimped onto the wire.

[0020] Figure 6 This is an explanatory diagram showing the state after the crimp terminal has been crimped onto the wire.

[0021] Figure 7 yes Figure 6 CC section view.

[0022] Figure 8 yes Figure 7 DD sectional view.

[0023] Figure 9 This is an explanatory diagram showing that the angle of inclination of the side of the fine teeth is the same at the position of the base plate and the position of the conductor fastening piece when the conductor crimping part is in a flat, unfolded state.

[0024] Figure 10 It means to Figure 9 The diagram illustrates the state in which the conductor clamping tab of the conductor crimping part is fastened and crimped onto the conductor.

[0025] Figure 11 This is an explanatory diagram showing the unfolded state of the conductor crimping portion in a modified embodiment.

[0026] Symbol Explanation

[0027] 10 Crimping terminals

[0028] 11 Electrical connection parts

[0029] 15. Base plate

[0030] 20 Conductor crimping section

[0031] 21 Conductor fastener

[0032] 30 fine teeth

[0033] 31 Opening

[0034] 32 Bottom

[0035] 33 Side View

[0036] 40. Covered fastening part

[0037] 41. Covered fastener

[0038] 51 First connecting part

[0039] 52 Side panels

[0040] 55 Second connecting part

[0041] 56 Side panels

[0042] W wire

[0043] Wa conductor

[0044] Wc insulation coating Detailed Implementation

[0045] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to these embodiments. Furthermore, the constituent elements in the following embodiments include elements that can be easily substituted by those skilled in the art, or substantially the same elements.

[0046] [Implementation Method]

[0047] Figure 1 This is a perspective view of the crimp terminal 10 according to the embodiment. The crimp terminal 10 according to the embodiment is a component made of metal material, and from one end to the other end along the length direction of the crimp terminal 10 or along the length direction of the conductor of the wire crimped by the crimp terminal 10, it includes an electrical connection portion 11, a conductor crimping portion 20, and a sheath fastening portion 40. In addition, a first connection portion 51 is provided between the electrical connection portion 11 and the conductor crimping portion 20 to connect the electrical connection portion 11 and the conductor crimping portion 20, and a second connection portion 55 is provided between the conductor crimping portion 20 and the sheath fastening portion 40 to connect the conductor crimping portion 20 and the sheath fastening portion 40.

[0048] The electrical connection portion 11 is the part to which the terminal on the mating connector side connected to the crimp terminal 10 is connected. In addition, the conductor crimp portion 20 is the part to which the conductor of the wire crimped with the crimp terminal 10 is crimped, and the sheath fastening portion 40 is the part to which the conductor of the wire crimped with the crimp terminal 10 is covered by an insulating sheath and fastened.

[0049] In detail, the conductor crimping portion 20 is configured to include a base plate 15 and a conductor fastening piece 21. The base plate 15 is a plate-shaped component formed from the first connecting portion 51 to the sheathing fastening portion 40. The base plate 15 has a conductor Wa (see reference) of the wire W that is crimped to the crimping terminal 10 at the position of the conductor crimping portion 20. Figure 5 Additionally, a pair of conductor fastening tabs 21 are provided extending from both sides of the base plate 15 in a direction intersecting the extension direction of the conductor Wa of the wire W.

[0050] That is, the conductor fastening pieces 21 are arranged extending from both sides of the base plate 15 in the width direction. For example, the conductor fastening pieces 21 are... Figure 1 As shown, the two conductor fastening tabs 21 are bent from the base plate 15 toward the side of the base plate 15 relative to the base plate 15 in the thickness direction, before being pressed onto the wire W. Figure 1In this state, when viewed from the direction of extension of the wire W, the base plate 15 and the conductor fastening piece 21 form an approximate U-shape.

[0051] Furthermore, on the side of the conductor crimping portion 20 that contacts the conductor Wa of the wire W, fine teeth 30 extending in a groove shape are formed along a direction intersecting the extending direction of the conductor Wa disposed on the base plate 15, covering both the pair of conductor fastening pieces 21 and the base plate 15. That is, the fine teeth 30 are formed on the inner surface side of the conductor fastening piece 21 in the direction of bending relative to the base plate 15. Multiple fine teeth 30 formed in a groove shape are arranged in the extending direction of the wire W crimped by the conductor crimping portion 20. In this embodiment, three fine teeth 30 are arranged in the extending direction of the wire W crimped by the conductor crimping portion 20.

[0052] Furthermore, the sheathed fastening part 40 is configured to include a base plate 15 and a sheathed fastening piece 41. The base plate 15 is positioned at the location of the sheathed fastening part 40 and has an insulating sheath Wc (see reference) on the wire W that is crimped to the crimp terminal 10. Figure 5 In addition, a pair of covering fasteners 41 are provided extending from both sides of the base plate 15 in a direction intersecting the extension direction of the wire W.

[0053] That is, the skin-covered fastening pieces 41 are provided extending from both sides of the base plate 15 in the width direction. For example, the skin-covered fastening pieces 41 are... Figure 1 As shown, the two covered fastening tabs 41 are bent from the base plate 15 toward the side of the base plate 15 relative to the base plate 15 where the wire W is disposed, in the thickness direction of the base plate 15, before being pressed toward the wire W. Figure 1 In this state, when viewed from the extension direction of the wire W, the base plate 15 and the sheath fastening piece 41 are formed in a generally U-shape. That is, the sheath fastening piece 41 is bent in the same direction as the conductor fastening piece 21 of the conductor crimping portion 20 is bent relative to the base plate 15 in the thickness direction of the base plate 15.

[0054] Furthermore, the first connecting portion 51 is configured to include a base plate 15 and a side plate 52, with a pair of side plates 52 extending from both sides of the base plate 15 in a direction intersecting the extension direction of the wire W. Additionally, the second connecting portion 55 is configured to include a base plate 15 and a side plate 56, with a pair of side plates 56 extending from both sides of the base plate 15 in a direction intersecting the extension direction of the wire W.

[0055] The side plates 52 of the first connecting portion 51 and the side plates 56 of the second connecting portion 55 are bent in the same direction as the conductor fastening piece 21 of the conductor crimping portion 20 and the covering fastening piece 41 of the covering fastening portion 40, relative to the base plate 15, in the same direction as the conductor fastening piece 21 and the covering fastening piece 41. Furthermore, the side plates 52 of the first connecting portion 51 connect the electrical connecting portion 11 and the conductor fastening piece 21, and the side plates 56 of the second connecting portion 55 connect the conductor fastening piece 21 and the covering fastening piece 41.

[0056] Figure 2 yes Figure 1 This is an explanatory diagram showing the conductor crimping portion 20 in its unfolded state. The conductor crimping portion 20 is crimped onto the conductor Wa of the wire W (see reference). Figure 5 In the previously flat, unfolded state, fine teeth 30 formed in the conductor crimping portion 20 extend across the base plate 15 from one of the pair of conductor fastening pieces 21 in the conductor crimping portion 20 to the other. That is, the fine teeth 30 are formed along a direction intersecting the extending direction of the conductor Wa disposed on the base plate 15. In this embodiment, the fine teeth 30 are formed along a direction substantially orthogonal to the extending direction of the conductor Wa disposed on the base plate 15. In other words, the fine teeth 30 are formed with the extending direction of the conductor Wa disposed on the base plate 15 becoming the orientation of the shape of the fine teeth 30, i.e., the width direction of the groove.

[0057] Figure 3 yes Figure 2 AA sectional view. Figure 4 yes Figure 2 The BB cross-sectional view shows that the fine tooth 30 is formed in a groove shape with a bottom surface 32 and a side surface 33, and opens at the opening 31 on the side of the conductor Wa that is pressed into the conductor crimping portion 20. Furthermore, in the flat, unfolded state before the conductor crimping portion 20 is pressed into the conductor Wa, the width Sa of the opening 31 of the fine tooth 30 along the extension direction of the conductor Wa of the wire W is equal to or greater than the width Sb of the bottom surface 32 of the fine tooth 30 along the extension direction of the conductor Wa of the wire W. That is, in the flat, unfolded state of the conductor crimping portion 20, regardless of any position along the length of the fine tooth 30, the width Sa of the opening 31 of the fine tooth 30 is greater than the width Sb of the bottom surface 32 of the fine tooth 30.

[0058] Furthermore, in the flat, unfolded state before the conductor crimping portion 20 is crimped onto the conductor Wa, the angle θ2 between the normal L of the side surface 33 and the bottom surface 32 at at least a portion of the portion of the fine teeth 30 located on the conductor fastening piece 21 is greater than the angle θ1 between the side surface 33 and the bottom surface 32 located on the base plate 15. That is, the angle θ2 between the side surface 33 and the depth direction of the fine teeth 30 at at least a portion of the portion of the conductor fastening piece 21 is greater than the angle θ1 between the side surface 33 and the depth direction of the fine teeth 30 located on the base plate 15.

[0059] In detail, the width Sb of the bottom surface 32 of the fine tooth 30 is a fixed width, independent of its position along the length direction, while the width Sa of the opening 31 varies depending on its position along the length direction. That is, in the unfolded state where the conductor crimping portion 20 is flat, the width Sb of the bottom surface 32 of the fine tooth 30 is a fixed width, and the width Sa of the opening 31 located at least a portion of the conductor fastening piece 21 is greater than the width Sa of the opening 31 located at the base plate 15. Therefore, in the unfolded state where the conductor crimping portion 20 is flat, the angle θ2 of the side surface 33 of the fine tooth 30 located at at least a portion of the conductor fastening piece 21 is greater than the angle θ1 of the side surface 33 located at the base plate 15. The angles θ1 and θ2 between the side surface 33 of the fine tooth 30 and the normal L of the bottom surface 32 are preferably greater than 0° and less than or equal to 30° at any position.

[0060] In this embodiment, when the conductor crimping portion 20 is in its flat, unfolded state, the width Sa of the opening 31 of the fine teeth 30 varies near the connection between the conductor fastening piece 21 and the base plate 15. The width Sa of the opening 31 on the conductor fastening piece 21 side is larger than the width Sa of the opening 31 on the base plate 15 side. Therefore, in the fine teeth 30, the width Sa of the opening 31 of the fine teeth 30 covering almost the entire conductor fastening piece 21 is greater than the width Sa of the opening 31 on the base plate 15 side. Consequently, when the conductor crimping portion 20 is in its flat, unfolded state, the angle θ2 between the normal L of the side surface 33 and the bottom surface 32 of the fine teeth 30 covering almost the entire conductor fastening piece 21 is greater than the angle θ1 between the normal L of the side surface 33 and the bottom surface 32 of the fine teeth 30 covering the base plate 15 side.

[0061] Furthermore, in the description related to the shape of the fine teeth 30, the fine teeth 30 in the unfolded state of the conductor crimping portion 20 being a flat plate were described, but in the individual crimping terminal 10, such as Figure 1 As shown, the base plate 15 and a pair of conductor fastening tabs 21 are processed into a roughly U-shaped state. The skin-covered fastening part 40 is also similarly present in the crimp terminal 10 unit, as... Figure 1As shown, the base plate 15 and a pair of skin-covered fastening plates 41 are processed into a roughly U-shaped state.

[0062] The crimp terminal 10 involved in this embodiment has the structure described above, and its function will be explained next. Figure 5 This is an explanatory diagram showing the state before the crimp terminal 10 is crimped onto the wire W. The crimp terminal 10 according to this embodiment is used to crimp a wire W, which is covered by an insulating sheath Wc, to a wire Wa, which is made of metal. When crimping the crimp terminal 10 onto the wire W, the insulating sheath Wc located near the end of the wire W is removed, and the wire W is inserted between a pair of conductor fastening tabs 21 and a pair of sheath fastening tabs 41 of the crimp terminal 10, with the conductor Wa exposed near the end of the wire W. The wire W is inserted between the conductor fastening tabs 21 and the sheath fastening tabs 41 of the crimp terminal 10, for example, by placing the crimp terminal 10 on a lower die (anvil) (not shown) used when crimping the crimp terminal 10 onto the wire W.

[0063] At this time, the exposed conductor Wa of the wire W is positioned between a pair of conductor fastening tabs 21, and the portion of conductor Wa covered by the insulating sheath Wc is positioned between a pair of sheath fastening tabs 41. In other words, the exposed conductor Wa of the wire W is located at the conductor crimping portion 20, and the portion of conductor Wa covered by the insulating sheath Wc is located at the sheath fastening portion 40. Thus, the conductor Wa of the wire W is positioned on the base plate 15 of the conductor crimping portion 20 of the crimp terminal 10, and the portion of conductor Wa covered by the insulating sheath Wc is positioned on the base plate 15 of the sheath fastening portion 40 of the crimp terminal 10.

[0064] Figure 6 This is an explanatory diagram showing the state in which the crimp terminal 10 is crimped onto the wire W. After the wire W is inserted between the conductor fastening piece 21 and the sheath fastening piece 41 of the crimp terminal 10, the conductor fastening piece 21 and the sheath fastening piece 41 are tightened. When the conductor fastening piece 21 and the sheath fastening piece 41 of the crimp terminal 10 are tightened, the upper die (crewer) (not shown) used to crimp the crimp terminal 10 onto the wire W is lowered from above the crimp terminal 10 toward the crimp terminal 10. As a result, the upper die and the lower die clamp the crimp terminal 10 on the base plate 15 with the wire W placed thereon, and the conductor fastening piece 21 and the sheath fastening piece 41 are curled back toward the side where the wire W is placed by the guide surface formed on the side of the upper die opposite to the crimp terminal 10.

[0065] A pair of conductor fastening tabs 21 are each rolled back towards the side where the wire W is disposed, thereby fastening the pair of conductor fastening tabs 21 to the conductor Wa of the wire W disposed on the base plate 15 while covering the conductor Wa. The conductor crimping part 20 with conductor fastening tabs 21 is fastened by covering the conductor Wa of the wire W disposed on the base plate 15 with conductor fastening tabs 21, thereby crimping and connecting to the conductor Wa of the wire W.

[0066] Similarly, the pair of sheathed fasteners 41 are each rolled back towards the side where the wire W is disposed, thereby fastening the pair of sheathed fasteners 41 to the wire W with the conductor Wa in the wire W disposed on the base plate 15 covered by the insulating sheath Wc. The sheathed fastening part 40 with the sheathed fasteners 41 is fastened by covering the wire W disposed on the base plate 15 with the sheathed fasteners 41, thereby crimping and connecting to the wire W.

[0067] Thus, with the conductor fastening piece 21 of the conductor crimping part 20 and the side of the base plate 15 with fine teeth 30 in contact with the conductor Wa of the wire W, the crimping terminal 10 is crimped and connected to the wire W.

[0068] Figure 7 yes Figure 6 The CC cross-sectional view. With the conductor crimping portion 20 crimped onto the conductor Wa of the wire W, when the conductor crimping portion 20 is viewed in the extending direction of the conductor Wa, either of the pair of conductor fastening tabs 21 bends considerably in the direction in which it protrudes and bends toward the side opposite to the side in contact with the conductor Wa. On the other hand, compared to the conductor fastening tabs 21, the shape of the base plate 15 does not change significantly before and after the conductor crimping portion 20 is crimped onto the conductor Wa, and when the conductor crimping portion 20 is viewed from the extending direction of the conductor Wa, the base plate 15 bends gently in the direction in which it protrudes toward the side opposite to the side in contact with the conductor Wa.

[0069] Therefore, when the conductor crimping portion 20 is crimped onto the conductor Wa, and when the conductor crimping portion 20 is viewed from the extending direction of the conductor Wa, the radius of curvature of the conductor fastening piece 21 is smaller than the radius of curvature of the base plate 15. In other words, when the conductor crimping portion 20 is crimped onto the conductor Wa, and when the conductor crimping portion 20 is viewed from the extending direction of the conductor Wa, the curvature of the conductor fastening piece 21 is greater than the curvature of the base plate 15.

[0070] When crimping the conductor Wa, fine teeth 30 are formed in the conductor crimping portion 20 of the conductor fastening piece 21, which has such a large curvature. However, in the unfolded state where the conductor crimping portion 20 is in a flat plate shape, the angle θ2 of the side surface 33 of the fine teeth 30 located in almost all of the conductor fastening piece 21 (refer to...) Figure 4The angle θ1 of the side surface 33 of the fine tooth 30 located on the base plate 15 is greater than that of the fine tooth 30 (refer to...). Figure 3 Therefore, in the conductor fastening piece 21 with fine teeth 30, when viewed from the extension direction of conductor Wa after the conductor crimping portion 20 is crimped onto conductor Wa, the angle θ2 of the side surface 33 of the fine teeth 30 in the unfolded state of the conductor crimping portion 20 of the conductor fastening piece 21 with the smallest radius of curvature is greater than the angle θ1 of the side surface 33 of the unfolded state of the conductor crimping portion 20 of the portion located on the base plate 15.

[0071] Here, when the plate-shaped component is bent in the thickness direction of the plate, a tensile force acts on the outer side of the bending direction, and a compressive force acts on the inner side of the bending direction. Therefore, since the conductor fastening piece 21 is bent significantly and fastened to the conductor Wa of the wire W, when the conductor crimping part 20 is pressed onto the conductor Wa, a tensile force Ft also acts on the outer side of the bending direction and a compressive force Fc acts on the inner side of the bending direction in the conductor fastening piece 21. That is, on the conductor fastening piece 21 fastened to the conductor, a tensile force Ft acts on the surface opposite to the side of the conductor Wa in the thickness direction, and a compressive force Fc acts on the surface of the conductor fastening piece 21 on the side of the conductor Wa.

[0072] Figure 8 yes Figure 7 A DD cross-sectional view. Fine teeth 30 are formed on the side of the conductor fastener 21 that contacts the conductor Wa. However, if the conductor fastener 21 is significantly bent and a compressive force Fc acts on the portion of the conductor fastener 21 in the thickness direction where the conductor Wa is located, the fine teeth 30 are easily compressed by the compressive force Fc. In this case, the portion of the fine teeth 30 located in the conductor fastener 21 is compressed by the compressive force Fc, for example, in a direction that narrows the width of the opening 31. As a result, the portion of the fine teeth 30 located in the conductor fastener 21 deforms in the direction that narrows the width of the opening 31.

[0073] When the conductor fastening piece 21 is fastened, the portion of the fine teeth 30 located in the conductor fastening piece 21 deforms in the direction that narrows the width of the opening 31. However, in the unfolded state where the conductor crimping portion 20 is in a flat plate shape, the angle θ2 of the side surface 33 of the fine teeth 30 located at least a portion of the portion of the conductor fastening piece 21 is greater than the angle θ1 of the side surface 33 of the fine teeth 30 located in the portion of the base plate 15.

[0074] That is, compared with the portion of the fine teeth 30 located on the conductor fastening piece 21, the width Sa of the opening 31 is relatively larger than the width Sb of the bottom surface 32. Therefore, even if the portion of the fine teeth 30 located on the conductor fastening piece 21 deforms in the direction that narrows the width of the opening 31 due to the large bending of the conductor fastening piece 21, the width of the opening 31 is not easily less than the width of the bottom surface 32, and the state in which the width of the opening 31 is larger than the width of the bottom surface 32 is maintained.

[0075] On the other hand, the portion of the base plate 15 located in the conductor crimping portion 20 will not deform significantly even when the conductor fastening piece 21 is tightened. Therefore, even when the conductor fastening piece 21 is tightened and the conductor crimping portion 20 is crimped to the conductor Wa of the wire W, the portion of the fine teeth 30 located in the base plate 15 maintains the same state where the width of the opening 31 is larger than the width of the bottom surface 32, just as the conductor crimping portion 20 is in a flat, unfolded state.

[0076] When the conductor clamping piece 21 is tightened to press the conductor crimping part 20 onto the conductor Wa of the wire W, a large load is applied to the conductor Wa from the conductor crimping part 20. That is, when the conductor crimping part 20 is pressed onto the conductor Wa of the wire W, a large load is applied to the conductor Wa from the conductor crimping part 20 by applying force from the upper and lower dies to the crimping terminal 10 in order to press the conductor crimping part 20 onto the conductor Wa. As a result, the conductor Wa is pressed tightly against the conductor crimping part 20, and the portion located on the fine teeth 30 enters into the fine teeth 30.

[0077] At this time, for the fine teeth 30, even after the conductor fastening piece 21 is tightened, the width of the opening 31 of the fine teeth 30 is greater than the width of the bottom surface 32, maintaining a shape in which the width widens from the bottom surface 32 toward the opening 31. In particular, in the portion of the fine teeth 30 formed in the conductor fastening piece 21, the conductor fastening piece 21 bends considerably when tightened, so the width of the opening 31 side of the fine teeth 30 tends to narrow. However, in this embodiment, even after the conductor fastening piece 21 is tightened, the width of the opening 31 side can be maintained as greater than the width of the bottom surface 32 side.

[0078] Figure 9 This is an explanatory diagram showing that the angle of inclination of the side 33 of the fine teeth 30 is the same at the position of the base plate 15 and the position of the conductor fastening piece 21 when the conductor crimping part 20 is in the unfolded state of the flat plate. Figure 10 It means to Figure 9 This diagram illustrates the state in which the conductor clamping tab 21 of the conductor crimping portion 20 is fastened and crimped onto the conductor Wa. The fine teeth 30 formed in the conductor crimping portion 20 are, for example... Figure 9As shown, when the conductor crimping part 20 is in a flat, unfolded state, and the width of the fine teeth 30 in the part located on the conductor fastening piece 21 and the part located on the base plate 15 is fixed, when the conductor fastening piece 21 is fastened, the conductor Wa becomes less likely to enter the part of the fine teeth 30 located on the conductor fastening piece 21.

[0079] That is, when the width of the opening 31 and the width of the bottom surface 32 of the fine tooth 30 are fixed at the portion of the fine tooth 30 located at the conductor fastening piece 21 and the portion located at the base plate 15, the angle of the side surface 33 of the portion of the fine tooth 30 located at the conductor fastening piece 21 becomes the same as the angle of the side surface 33 of the portion located at the base plate 15. In this case, when the conductor fastening piece 21 is bent more significantly and fastened, the portion of the fine tooth 30 located at the conductor fastening piece 21 will experience compressive force generated on the inner side in the bending direction when the conductor fastening piece 21 is bent more significantly, as... Figure 10 As shown, it deforms in a direction that narrows the width of the opening 31 side. Therefore, when the conductor crimping portion 20 is crimped to the conductor Wa by fastening the conductor fastening piece 21, the conductor Wa is less likely to enter the portion of the conductor fastening piece 21 located in the narrowed teeth 30 of the opening 31.

[0080] In contrast, in this embodiment, when the conductor crimping portion 20 is in a flat, unfolded state, the angle θ2 of the side surface 33 of the portion located on the conductor fastening piece 21 is greater than the angle θ1 of the side surface 33 of the portion located on the base plate 15. Therefore, even when a compressive force is applied due to the conductor fastening piece 21 being bent significantly, the width of the opening 31 in the portion located on the conductor fastening piece 21 does not easily become narrower. Therefore, when the conductor crimping portion 20 is crimped onto the conductor Wa, the portion of the conductor Wa adjacent to the conductor fastening piece 21 easily enters the portion of the fine teeth 30 located on the conductor fastening piece 21 due to the load acting on the conductor Wa from the conductor crimping portion 20 during crimping. The portion of the conductor Wa adjacent to the conductor fastening piece 21 and the conductor fastening piece 21 thus allow the conductor Wa to enter the fine teeth 30, thereby increasing the contact area between the conductor Wa and the conductor fastening piece 21. As a result, the resistance at the crimping portion of the conductor Wa and the crimping terminal 10, i.e., the crimping resistance, is reduced.

[0081] Furthermore, even when the conductor crimping portion 20 is crimped onto the conductor Wa, the shape of the portion of the conductor crimping portion 20 located on the base plate 15 side does not easily change relative to before crimping, and the shape of the portion of the fine teeth 30 located on the base plate 15 also does not easily change. Therefore, even when the conductor crimping portion 20 is crimped onto the conductor Wa, the portion of the fine teeth 30 located on the base plate 15 can maintain a state where the width on the opening 31 side is larger than the width on the bottom surface 32 side. Therefore, the portion of the conductor Wa adjacent to the base plate 15 easily enters the portion of the fine teeth 30 located on the base plate 15 due to the load acting on the conductor Wa from the conductor crimping portion 20 during crimping. As a result, the contact area between the portion of the conductor Wa adjacent to the base plate 15 and the base plate 15 increases, thus reducing the crimping resistance.

[0082] In the crimp terminal 10 described in the above embodiments, when the fine teeth 30 formed in the conductor crimping portion 20 are in an unfolded state where the conductor crimping portion 20 is in a flat plate shape, the angle θ2 of the side surface 33 located at at least a portion of the conductor fastening piece 21 is greater than the angle θ1 of the side surface 33 located in the base plate 15. Therefore, even when the conductor crimping portion 20 is crimped to the conductor Wa by fastening the conductor fastening piece 21, it is possible to prevent the width of the opening 31 in the portion of the fine teeth 30 located in the conductor fastening piece 21 from becoming smaller than the width of the bottom surface 32 of the fine teeth 30 due to the compressive force when the conductor fastening piece 21 is bent.

[0083] Therefore, even when the conductor fastening piece 21 is bent and tightened significantly, making it easy for the width of the opening 31 in the portion of the fine teeth 30 located in the conductor fastening piece 21 to narrow, the portion of the conductor Wa adjacent to the conductor fastening piece 21 can still easily enter the fine teeth 30. Thus, when the conductor fastening piece 21 is tightened and the conductor crimping portion 20 is crimped onto the conductor Wa, the conductor Wa enters the fine teeth 30, thereby increasing the contact area between the conductor Wa and the crimping terminal 10 and reducing the resistance between the conductor Wa and the crimping terminal 10. As a result, the resistance of the crimping portion can be stably reduced.

[0084] Furthermore, when the conductor fastening piece 21 is tightened and the conductor crimping part 20 is crimped onto the conductor Wa, the conductor Wa can easily enter the fine teeth 30 at any position on either the conductor fastening piece 21 side or the base plate 15 side, thus restricting the relative movement between the conductor Wa and the conductor crimping part 20. As a result, the mechanical connection between the conductor Wa and the conductor crimping part 20 is made strong.

[0085] Furthermore, the angles θ1 and θ2 between the side surface 33 of the fine teeth 30 and the normal L of the bottom surface 32 are greater than 0° and less than 30°, thus ensuring the mechanical connection force between the conductor Wa and the conductor crimping portion 20. That is, when the angles θ1 and θ2 between the side surface 33 of the fine teeth 30 and the normal L of the bottom surface 32 are greater than 30°, the adhesion between the conductor Wa of the wire W and the opening 31 of the fine teeth 30 may be reduced, making it difficult to ensure the connection force generated by the fine teeth 30. Conversely, when the angles θ1 and θ2 between the side surface 33 of the fine teeth 30 and the normal L of the bottom surface 32 are less than 30°, the adhesion between the conductor Wa of the wire W and the opening 31 of the fine teeth 30 is ensured, thus ensuring the connection force generated by the fine teeth 30. As a result, the mechanical connection force between the conductor Wa and the conductor crimping portion 20 is strong.

[0086] Furthermore, when the conductor crimping portion 20 is crimped onto the conductor Wa, viewed from the extension direction of the conductor Wa, the radius of curvature of the conductor fastening piece 21 is smaller than the radius of curvature of the base plate 15. Therefore, in the unfolded state of the conductor crimping portion 20, by making the angle θ2 of the side surface 33 of the portion of the fine teeth 30 located on the conductor fastening piece 21 greater than the angle θ1 of the side surface 33 of the portion located on the base plate 15, even when the conductor fastening piece 21 is bent and fastened with a small radius of curvature, the compressive force during bending can prevent the width of the opening 31 of the fine teeth 30 from becoming smaller than the width of the bottom surface 32. Therefore, when the conductor fastening piece 21 is fastened and the conductor crimping portion 20 is crimped onto the conductor Wa, the conductor Wa can easily enter the fine teeth 30, increasing the contact area between the conductor Wa and the crimp terminal 10, thereby reducing the resistance between the conductor Wa and the crimp terminal 10. As a result, the resistance of the crimping portion can be stably reduced.

[0087] Furthermore, the angle θ2 of the side surface 33 of the fine teeth 30 in the unfolded state of the conductor crimping portion 20, where the conductor crimping portion 20 has the smallest radius of curvature, is greater than the angle θ1 of the side surface 33 of the unfolded state of the conductor crimping portion 20 located on the base plate 15. Therefore, when the conductor crimping portion 21 is bent and tightened with a small radius of curvature, the width of the opening 31 of the fine teeth 30 can be prevented from becoming smaller than the width of the bottom surface 32 due to the compressive force. As a result, when the conductor crimping portion 20 is pressed against the conductor Wa by tightening the conductor crimping portion 21, the conductor Wa can easily enter the fine teeth 30, increasing the contact area between the conductor Wa and the crimp terminal 10, thereby reducing the resistance between the conductor Wa and the crimp terminal 10. Consequently, the resistance of the crimping portion can be stably reduced.

[0088] [Variation Example]

[0089] Furthermore, in the above embodiment, when the conductor crimping portion 20 is in the unfolded state, the width of the opening 31 of the fine teeth 30 formed in the conductor crimping portion 20 changes abruptly at a predetermined position in the length direction of the fine teeth 30, thereby changing the angle of the side surface 33. However, the width of the opening 31 can also change gradually. That is, the side surface 33 of the fine teeth 30 relative to the normal L of the bottom surface 32 can also change gradually with the change in the width of the opening 31.

[0090] Furthermore, in the above embodiment, in the unfolded state of the conductor crimping portion 20, the width of the opening 31 of the fine teeth 30 formed in the conductor crimping portion 20 varies according to the position of the fine teeth 30 in the longitudinal direction. Therefore, the angle θ2 of the side surface 33 located at at least a portion of the conductor fastening piece 21 (refer to...) Figure 4 The angle θ1 of the side surface 33 of the portion located on the base plate 15 is greater than the angle θ1 (refer to the angle θ1 of the side surface 33 of the portion located on the base plate 15). Figure 3 However, the angle of the side 33 of the fine tooth 30 can also be varied in other ways.

[0091] Figure 11 This is an explanatory diagram showing the unfolded state of the conductor crimping portion 20 in a modified embodiment. For example, as shown... Figure 11 As shown, the width of the opening 31 of the fine tooth 30 is a fixed width, and the width of the bottom surface 32 varies depending on the position of the fine tooth 30 in the length direction. Therefore, the angle θ2 of the side surface 33 of the part located in the conductor fastening piece 21 can also be greater than the angle θ1 of the side surface 33 of the part located in the base plate 15.

[0092] exist Figure 11 In the conductor crimping portion 20, in its flat, unfolded state, the width of the bottom surface 32 of the fine teeth 30 varies near the connection between the conductor fastening piece 21 and the base plate 15. The width of the bottom surface 32 on the conductor fastening piece 21 side is smaller than the width of the bottom surface 32 on the base plate 15 side. Since the width of the opening 31 is fixed, due to this variation in the width of the bottom surface 32, the portion of the fine teeth 30 where the bottom surface 32 is relatively smaller—that is, the portion on the conductor fastening piece 21 side—has a side surface angle θ2 greater than the side surface angle θ1 of the portion on the base plate 15 side. Thus, the method of forming this configuration is not limited as long as the side surface angle θ2 of at least a portion of the fine teeth 30 on the conductor fastening piece 21 side is greater than the side surface angle θ1 of the fine teeth 30 on the base plate 15 side.

[0093] Furthermore, in the above-described embodiment, the shape of the base plate 15 does not change significantly before and after the conductor crimping portion 20 is crimped onto the conductor Wa of the wire W. However, when the conductor crimping portion 20 is crimped onto the conductor Wa of the wire W, if the base plate 15 is also bent compared to before crimping, the angle of the side surface 33 can change even in the portion of the base plate 15 where the fine teeth 30 are formed. For example, when the conductor crimping portion 20 is crimped onto the conductor Wa, if the base plate 15 is bent near the center of the fine teeth 30 in the length direction compared to before crimping, the angle of the side surface 33 of the fine teeth 30 near the bent portion of the base plate 15 can be greater than the angle of the side surface 33 of the less bent portion of the base plate 15.

[0094] Therefore, when the conductor crimping portion 20 is crimped onto the conductor Wa of the wire W, even if a portion of the base plate 15 is bent, the width of the opening 31 of the fine teeth 30 on the bent portion of the base plate 15 can be prevented from being smaller than the width of the bottom surface 32. When the conductor crimping portion 20 is crimped onto the conductor Wa, the conductor Wa can easily enter the fine teeth 30. Therefore, the contact area between the conductor Wa and the crimp terminal 10 can be increased, the resistance between the conductor Wa and the crimp terminal 10 can be reduced, and thus the resistance of the crimping portion can be stably reduced.

[0095] In addition, in the above embodiment, three fine teeth 30 are formed in the conductor crimping portion 20, but the fine teeth 30 formed in the conductor crimping portion 20 may be two or less, or four or more.

[0096] Furthermore, the crimp terminals described in the above-described embodiments and modifications of the present invention are not limited to the embodiments and modifications described above, and various modifications can be made within the scope of the claims. The crimp terminals described in these embodiments and modifications can also be constructed by appropriately combining the constituent elements of the embodiments and modifications described above.

Claims

1. A crimp terminal, characterized in that, have: A conductor crimping portion is configured to include: a base plate on which a conductor of an electrical wire is disposed; and a pair of conductor fastening tabs extending from both sides of the base plate in a direction intersecting the extending direction of the conductor. The conductor crimping portion is crimped and connected to the conductor of the electrical wire by covering and fastening the conductor disposed on the base plate with the conductor fastening tabs. The conductor crimping portion has fine teeth formed on the side of the surface that contacts the conductor. These fine teeth extend in a groove shape across the pair of conductor fasteners and the base plate in a direction intersecting the extension direction of the conductor disposed on the base plate. The fine teeth are designed in a flat, unfolded state before the conductor crimping portion is crimped onto the conductor, such that the width of the opening of the fine teeth along the extending direction is equal to or greater than the width of the bottom surface of the fine teeth along the extending direction, and the angle between the side surface of the fine teeth located at at least a portion of the conductor fastening piece and the normal to the bottom surface is greater than the angle between the side surface of the fine teeth located at the bottom plate and the normal to the bottom surface.

2. The crimp terminal according to claim 1, characterized in that, With the conductor crimped onto the conductor, when viewed from the extension direction of the conductor, the radius of curvature of the conductor fastening piece is smaller than the radius of curvature of the base plate.

3. The crimp terminal according to claim 1 or 2, characterized in that, The portion of the conductor fastening piece with the smallest radius of curvature when viewed from the extension direction of the conductor after the conductor crimping portion is crimped onto the conductor, and the portion of the conductor crimping portion in its unfolded state having an angle greater than the normal to the bottom surface of its side surface in its unfolded state than the portion located on the base plate.

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