JP6232003B2 - Terminal, terminal structure and rotating electric machine - Google Patents

Description

  The present invention relates to a terminal, a terminal structure, and a rotating electrical machine.

  In motors used in harsh usage environments such as fuel pump motors for automobiles, the electrical connection terminals are required to have heat resistance and solvent resistance. Patent Documents 1 and 2 disclose a terminal whose surface is nickel-plated in order to improve heat resistance and solvent resistance.

JP 2009-62880 A Japanese Patent Laid-Open No. 2003-342781

  In addition to nickel plating with high heat resistance and high solvent resistance, the surface of the terminal described in Patent Document 1 has low heat resistance that facilitates thermal bonding in order to ensure electrical connectivity with wires. Tin plating is also applied. For this reason, in the case of the terminal described in Patent Document 1, the tin plating surface may be exposed to the outside, and the heat resistance and solvent resistance may be insufficient.

  In the terminal described in Patent Document 2, nickel plating with high heat resistance is applied to the entire surface of the terminal body as a base. For this reason, when the wires are thermally bonded, the nickel plating is difficult to be melted by heat, so that the welding strength between the wires and the terminals may be insufficient.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a terminal, a terminal structure, and a rotating electrical machine that have both heat resistance and solvent resistance.

In order to achieve the above object, the terminal according to the first aspect of the present invention is:
The wire is connected in a conductive manner, and is a terminal whose connection portion with the wire is covered by a resin portion included in a terminal attachment target,
A terminal body provided with a resin-coated surface covered with the resin portion and an exposed surface exposed to the outside from the resin portion;
A first plating portion applied to at least the resin-coated surface;
A second plating portion made of a material having higher heat resistance and solvent resistance than the material of the first plating portion;
Have
The second plating part is formed so that the end of the surface is covered with the resin part.

The terminal structure according to the second aspect of the present invention is
A resin portion covering the connection portion with the wire;
A terminal according to a first aspect;
Have

The rotating electrical machine according to the third aspect of the present invention is:
A terminal structure according to a second aspect;
A rotor,
A stator that rotates the rotor by electromagnetic interaction with the rotor;
Is provided.

  According to the present invention, since the first plating portion is provided, the thermal bondability for connecting the wires is improved, and the end on the surface of the second plating portion is formed at a position covered with the resin portion. The first plating part can be covered with the second plating part or the resin part. As a result, it is possible to provide a terminal, a terminal structure, and a rotating electrical machine that have both heat resistance and solvent resistance.

It is sectional drawing of the motor unit which concerns on embodiment of this invention. (A) is a front view which shows the structure of a terminal. (B) is a side view which shows the structure of a terminal. It is sectional drawing which expands and shows a part of terminal typically. 10 is an enlarged cross-sectional view schematically showing a part of a terminal according to Modification 1. FIG. 10 is a cross-sectional view schematically showing an enlarged part of a terminal according to Modification 2. FIG.

  Hereinafter, a motor unit 1 to which a terminal 100 according to an embodiment of the present invention is attached will be described with reference to FIGS. In order to facilitate understanding, XYZ coordinates are set and referred to as appropriate.

  The motor unit 1 is a brushless motor that is used, for example, in a fuel pump of an automobile and whose rotor rotates by changing the direction of current flowing through a circuit. Since the motor unit 1 is used in a high temperature environment, heat resistance is required, and solvent resistance to fuel or the like is required. As shown in FIG. 1, the motor unit 1 includes a casing 10, a shaft 20 housed in the casing 10, a rotor 30, a stator 40, a pair of bearings 50 </ b> A and 50 </ b> B, and a part from the casing 10 to the outside. And an exposed terminal 100.

  The casing 10 includes a casing main body 11 formed in a substantially cylindrical shape, and brackets 12 and 13 into which bearings 50A and 50B are fitted, respectively. The brackets 12 and 13 are made of resin, and are formed by, for example, injection molding. The brackets 12 and 13 are attached to openings on the front end side and the rear end side of the casing body 11 in a state where various members such as the rotor 30 are accommodated in the casing body 11. Thereby, the casing 10 covers various members such as the rotor 30 while protecting them.

  The shaft 20 is a substantially cylindrical member whose longitudinal direction is the Z-axis direction. The shaft 20 is rotatably supported by a pair of bearings 50A and 50B so as to be parallel to the Z axis.

  The rotor 30 is formed in a cylindrical shape and is fixed to the outer peripheral surface of the shaft 20. The rotor 30 includes, for example, a permanent magnet and a rotor yoke.

  The stator 40 is disposed around the rotor 30, and rotates the shaft 20 together with the rotor 30 by electromagnetic interaction with the rotor 30. The stator 40 includes, for example, a stator core and a coil wound around the stator core. The tip of a wire (not shown) constituting this coil is drawn from the stator and electrically connected to the terminal 100.

  The terminal 100 is a member formed integrally with the bracket 13 by insert molding.

  As shown in FIG. 2, the terminal 100 is a member formed by bending a plate-like member at right angles with the bent portions B1 and B2 as base points. Further, below the bent portion B2 of the terminal 100, a wire connecting portion 104 for connecting a wire (in this embodiment, a tip of a coil wound around the stator core) is formed so as to protrude. The terminal 100 includes a terminal main body 101 as a base made of a copper alloy, and a first plating portion 102 and a second plating portion 103 applied to the terminal main body 101.

  As shown in FIG. 3, the surface of the terminal 100 is formed with a resin-coated surface 101 a that is covered with a resin that is a material of the bracket 13 and an exposed surface 101 b that is exposed to the outside from the bracket 13.

  The first plating part 102 is formed on the resin-coated surface 101 a including the surface of the wire connection part 104. In the present embodiment, the material of the first plating part 102 is tin. However, it is not limited to this. A material other than tin may be used as long as a part of the wire and a part of the first plating portion 102 are thermally melted and joined by thermally joining the wires. However, it is desirable that the material of the first plating part 102 is tin from the viewpoint of the manufacturing cost of the material.

  The second plating part 103 is formed to protect the exposed surface 101b of the terminal body 101, and the exposed surface 101b of the terminal body 101, a part of the resin-coated surface 101a, and a part of the surface of the first plating part 102. And is formed. The second plating part 103 is made of a material having higher heat resistance and solvent resistance than the material of the first plating part 102. In the present embodiment, the material of the second plating part 103 is nickel. However, it is not limited to this. Any material other than nickel may be used as long as the exposed surface 101b of the terminal body 101 can be protected. However, in the present embodiment, the motor unit 1 is a motor used for a fuel pump of an automobile, and heat resistance and solvent resistance are required. Therefore, the material of the second plating portion 103 is preferably nickel. . A terminal end L1 on the surface of the second plating portion 103 (a boundary line between a portion where the second plating portion 103 is applied and a portion where the second plating portion 103 is not provided) is formed at a position covered with the resin constituting the bracket 13.

  Next, a method for manufacturing the terminal 100 according to the present embodiment will be described. First, an operator who manufactures the terminal 100 prepares a single plate material made of a copper alloy, and forms the terminal body 101 by performing bending or the like.

  Next, masking is performed on the terminal body 101 other than the portion where the tin plating process is performed. Subsequently, the terminal body 101 is subjected to a tin plating process (first plating process). Thereby, the 1st plating part 102 is formed in the resin coating | coated surface 101a.

  Next, masking is performed on the terminal body 101 on which the first plating part 102 is formed, except for the part where the nickel plating process (second plating process) is performed. The terminal body 101 subjected to masking is immersed in a plating tank for nickel plating. Thereby, the 2nd plating part 103 is formed in the exposed surface 101b and a part of resin-coated surface 101a.

  Next, a method for manufacturing the motor unit 1 according to this embodiment will be described. First, the tip of the coil wound around the stator core of the stator 40 via the insulator is pulled out, and a part of the wire connecting portion 104 (see FIG. 2) of the terminal body 101 and the tip of the coil are formed by fusing (heat caulking). And join. This joining process is performed by inserting a portion below the wire connecting portion 104 of the terminal 100 into a terminal mounting hole provided in the insulator. Thereby, the terminal body 101 and the tip of the coil are electrically connected.

  Next, the stator 40 with the terminal 100 formed as described above is set in an injection mold. Specifically, the stator 40 with the terminal 100 is set in an injection mold so that the exposed surface 101b of the terminal 100 is covered with the mold.

  Next, insert molding is performed by pouring resin into the cavity of the mold. At this time, although the mold becomes high temperature, the surface of the terminal 100 can be protected because the second plating portion 103 having high heat resistance is formed at the contact portion with the mold.

  Next, after the resin has hardened, the stator 40 with the terminals 100 is taken out from the mold. In the terminal 100 attached to the stator 40, the exposed surface 101b is exposed to the outside, and the resin-coated surface 101a is covered with resin. By this operation, the bracket 13 with the terminal 100 is integrally formed on one end side of the stator 40.

  The motor unit 1 is completed by assembling the rotor 30, the casing body 11 and other members to the bracket 13 with the stator 40 in which the terminals 100 are insert-molded.

  As described above, according to the present embodiment, since the terminal 100 includes the first plating portion 102 made of tin, it is possible to improve the thermal weldability for connecting the wires. In addition, by providing the second plating portion 103 made of nickel in a portion exposed to the outside, heat resistance and solvent resistance are improved. Further, since the terminal end L1 on the surface of the second plating portion 103 is formed at a position covered by the resin portion constituting the bracket 13, a comparison for connecting a wire (the tip of the coil in this embodiment) is performed. It becomes possible to cover with the resin part together with the first plating part 102 having low thermal resistance. Even if the 2nd plating part 103 is a part which is not covered with the resin part, since it is comprised from nickel, it has favorable heat resistance and solvent resistance. As a result, the terminal 100 having both heat resistance and solvent resistance can be provided.

  Further, as shown in FIG. 3, the first plating portion 102 is also applied to a part of the exposed surface 101 b together with the resin coating surface 101 a, and a part of the second plating portion 103 is formed on the surface of the first plating portion 102. Overlaid. For this reason, the overlapping part of the 1st plating part 102 and the 2nd plating part 103 is covered with the bracket 13 (resin). As a result, even if plating spots are generated at the boundary between the first plating part 102 and the second plating part 103, the plating spots are covered with the bracket 13, so that the heat resistance caused by the plating spots and A decrease in solvent resistance can be prevented. Moreover, corrosion when a non-plating part arises by plating spots can be prevented. In addition, as for the overlapping part of the first plating part 102 and the second plating part 103, the area of the overlapping part and the like can be appropriately set as long as there is no problem in the thermal bonding of the wires.

  In the present embodiment, when the terminal 100 is insert-molded with resin, the second plating portion 103 having high heat resistance is formed at the contact portion with the mold, so that the surface of the terminal 100 is protected. Can do. Therefore, it is possible to prevent the tin plating having a low heat resistance from coming into contact with the mold as in the prior art, and the plating portion is damaged by the high temperature mold, and the corrosion from the damaged portion proceeds. .

  As mentioned above, although embodiment of this invention was described, this invention is not limited by the said embodiment etc.

  For example, in the above-described embodiment, the first plating part 102 is formed on a part of the exposed surface 101b together with the resin-coated surface 101a. Like the terminal 100 </ b> A of Example 1, it may be applied to the entire surface of the terminal main body 101. Thereby, masking at the time of forming the 1st plating part 102 becomes unnecessary, and terminal 100A can be manufactured by fewer manufacturing processes. It is possible to provide a terminal, a terminal structure, and a rotating electrical machine that have both heat resistance and solvent resistance.

  Moreover, in the said embodiment, although a part of 2nd plating part 103 is overlapped and formed on the 1st plating part 102, not only this but the 2nd plating part 103 is a modification shown in FIG. As long as the terminal L1 on the surface is formed at a position covered with the bracket 13 like the second terminal 100B, it may not be formed on the first plated portion 102. Also in the modification 2, the same effect as the said embodiment can be show | played.

  Note that the wires in the above description may be other than the windings constituting the coil of the motor unit 1. For example, wiring of sensor elements such as Hall elements incorporated in the motor unit 1 may be used.

  Various embodiments and modifications can be made to the present invention without departing from the broad spirit and scope of the present invention. The above-described embodiments are for explaining the present invention, and do not limit the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Motor unit 10 Casing 11 Casing main body 12, 13 Bracket 20 Shaft 30 Rotor 40 Stator 50A, 50B Bearing 100 Terminal 101 Terminal main body 101a Resin coating surface 101b Exposed surface 102 1st plating part 103 2nd plating part 104 Wire connection part B1, B2 Bending part L1 End of surface

Claims (6)

The wire is connected in a conductive manner, and is a terminal whose connection portion with the wire is covered by a resin portion included in a terminal attachment target,
A terminal body provided with a resin-coated surface covered with the resin portion and an exposed surface exposed to the outside from the resin portion;
A first plating portion applied to at least the resin-coated surface;
A second plating portion made of a material having higher heat resistance and solvent resistance than the material of the first plating portion;
Have
The second plating part is a terminal formed such that a terminal end on the surface is covered with the resin part. The first plating portion is applied to a part of the exposed surface together with the resin-coated surface,
The terminal according to claim 1, wherein a part of the second plating part is formed so as to overlap the surface of the first plating part. The first plating portion is applied to the entire surface of the terminal body,
The terminal according to claim 1, wherein the second plating part is formed so as to overlap the surface of the first plating part. The material of the first plating part is composed of tin,
The terminal according to any one of claims 1 to 3, wherein a material of the second plating portion is made of nickel. A resin portion covering the connection portion with the wire;
The terminal according to any one of claims 1 to 4,
A terminal structure. A terminal structure according to claim 5;
A rotor,
A stator that rotates the rotor by electromagnetic interaction with the rotor;
A rotating electrical machine.

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