JP2007005143A - Connection structure of shield electric wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connection structure of a shielded electric wire having a simple structure and suppressing noise leaking to the outside. <P>SOLUTION: A plate 31 formed of a conductive material is connected to a motor housing 11 formed of a conductive material as well and protects, between the motor housing 11 and it, connection parts 26 between terminals 25 and feeder wires 14. The plate 31 covers insulated wires 22 (single wire parts 22a) exposed from a braided conductor 23 to shield the insulated wires 22 between the motor housing 11 and itself. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a shielded wire connection structure.

  Conventionally, various types of shield wire connection structures have been proposed. For example, in patent document 1, the shield connector is employ | adopted in the connection of the coaxial cable as a shield electric wire. This shield connector has a shield formed of a conductive metal at the tip, and the engagement claw provided on this shield is engaged with the other party (socket) to improve the reliability of these connections. .

Moreover, in patent document 2, the braided conductor which covers the insulated wire of a shield wire is connected to a shield shell, and the shield countermeasure is taken by fastening this to a shield case.
JP 2000-215948 A JP 2003-264040 A

By the way, in patent document 1, since a shield connector will be employ | adopted, it will enlarge as a whole and the installation space is forced to increase.
Further, in Patent Document 2, the connection structure between the braided conductor and the shield shell (inner shell and outer shell) is complicated, which necessitates an increase in the number of assembling steps, and it is difficult to assemble the shield case in this state. I guess that.

  The objective of this invention is providing the connection structure of the shielded electric wire which can suppress the noise which leaks outside with a simple structure.

  In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that the end portion of the insulated wire exposed from the braided conductor of the shielded wire in which the insulated wire is covered with the braided conductor is used as a power supply line of the motor. In the shielded wire connection structure for connecting and supplying power that selectively switches the polarity to the power supply line, the terminal portion and the power supply are coupled to the housing made of a conductive material of the motor. A protective member made of a conductive material that protects the connection portion with the electric wire, the protective member covering the insulated wire exposed from the braided conductor and shielding the insulated wire with the housing It is summarized as having.

The gist of the invention described in claim 2 is that the insulated wire covered with the braided conductor is plural in the shielded wire connection structure according to claim 1.
According to a third aspect of the present invention, in the shielded wire connection structure according to the first or second aspect, the covering portion is continuous on a top plate portion extending along the axis of the housing and on both sides of the top plate portion. And having a pair of side wall portions extending to the housing side.

  According to a fourth aspect of the present invention, in the shielded electric wire connection structure according to any one of the first to third aspects, a tape made of a conductive material is wound around the insulated electric wire exposed from the braided conductor. It is a summary.

(Function)
According to the first or second aspect of the present invention, the covering portion is set to the same potential as the housing by combining the protective member made of conductive materials and the housing. The covering portion shields the insulated wire exposed from the braided conductor between the housing and the housing, thereby suppressing external leakage of noise (switching noise) from the insulated wire exposed from the braided conductor. To do. Thus, the shield of the insulated wire exposed from the braided conductor is performed by the covering portion having a very simple structure provided integrally with a protective member made of a conductive material. Moreover, the increase in the number of parts is suppressed by providing the covering portion integrally with the protection member.

  According to invention of Claim 3, the said coating | coated part has the said top-plate part and a pair of side wall part, and is shape | molded in U shape. Therefore, since the insulated electric wire exposed from the braided conductor is shielded in such a manner that it is surrounded on all sides between the covering portion and the housing, the shielding performance is improved.

  According to the fourth aspect of the present invention, the insulated wire exposed from the braided conductor is wound with a tape made of a conductive material, so that the shielding performance of the insulated wire is further improved.

  According to the first to fourth aspects of the present invention, noise that leaks to the outside can be suppressed with a simple structure.

  Hereinafter, an embodiment in which the present invention is embodied in a three-phase brushless motor as an electric motor will be described with reference to FIGS. 1A is a plan view showing the main part of the brushless motor, and FIG. 1B is a cross-sectional view taken along line 1B-1B in FIG. In the figure, the left-right direction corresponds to the axial direction of the motor.

  As shown in FIG. 3, the brushless motor 10 includes a stator having U-phase, V-phase, and W-phase windings 10a, 10b, and 10c, and these windings are provided by a driver circuit (inverter circuit). The lines 10a to 10c are rotationally driven by selectively switching the polarity and supplying power.

  As shown in FIG. 1, the brushless motor 10 includes a motor housing 11 made of a conductive material (conductive metal) that houses a stator. A block-shaped pedestal portion 12 is integrally formed on one side of the motor housing 11 in the axial direction (on the left side in FIG. 1B) so as to protrude radially outward from the outer peripheral surface 11a. Further, on the other side in the axial direction of the motor housing 11 (on the right side in FIG. 1B), a box-shaped accommodation portion 13 that protrudes radially outward from the outer peripheral surface 11a is integrally formed. The accommodating portion 13 is arranged side by side with the pedestal portion 12 in the axial direction. The accommodating portion 13 accommodates a plurality (three) of feeder lines 14 that are individually electrically connected to the windings 10a to 10c. These feeders 14 are electrically opened from the accommodating portion 13 (motor housing 11).

  A shielded electric wire 21 is supported on the motor housing 11. This shielded electric wire 21 has a structure in which a plurality (three) of insulated wires 22 are collectively covered with a cylindrical braided conductor 23, and this braided conductor 23 is further covered with a cylindrical covering material 24 made of an insulating material. is doing. Each insulated wire 22 has a structure in which a core wire such as a copper wire is covered with an insulating material. One end of these insulated wires 22 is electrically connected to the driver circuit. The shielded electric wire 21 is supported by the motor housing 11 in such a manner that it is placed on the pedestal portion 12.

  Further, the braided conductor 23 is peeled off from the shield wire 21 together with the covering material 24 at the tip of the pedestal portion 12. The insulated wires 22 (hereinafter referred to as “single wire portions 22a”) exposed from the braided conductor 23 individually extend toward the housing portion 13 and are introduced and housed therein. Moreover, the terminal 25 as a terminal part fixed to the core wire by caulking is provided at the tip of each single wire part 22a. These terminals 25 are electrically opened from the accommodating portion 13 (motor housing 11). Each terminal 25 is individually connected to the power supply line 14 by, for example, bolt-nut fastening, and constitutes a connection portion 26 with the power supply line 14. Needless to say, these connecting portions 26 are electrically opened from the accommodating portion 13 (motor housing 11). The driver circuit is electrically connected to the power supply line 14 via each insulated wire 22 and performs power supply in which the polarity is selectively switched to the power supply line 14 (windings 10a to 10c).

  A plate 31 as a protection member is fastened to the housing portion 13 with screws 32. The plate 31 is formed by bending a plate material made of a conductive material (conductive metal), and integrally includes a main body portion 33 and a covering portion 34. The main body 33 closes an opening (outside in the radial direction) of the housing portion 13 and protects the connecting portion 26 between the housing portion 13 and the motor housing 11. For example, the main body part 33 prevents water from entering the connection part 26.

  The cover 34 is set to the same potential as the motor housing 11 by coupling the plate 31 made of conductive materials and the motor housing 11 together. The covering portion 34 includes a top plate portion 34a extending continuously from the main body portion 33 toward the shielded electric wire 21 (single wire portion 22a), and both sides of the same top plate portion 34a (upper and lower sides in FIG. 1A). And a pair of side wall portions 34b extending to the motor housing 11 side.

  The top plate portion 34 a is formed so that the tip thereof is inclined radially outward with respect to the axial direction, and covers the outside of the single wire portion 22 a along the axial direction of the motor housing 11. Further, the pair of side wall portions 34 b surround the single wire portion 22 a in a direction orthogonal to the axial direction of the motor housing 11. The top plate portion 34 a and the side wall portions 34 b shield the single wire portion 22 a from the motor housing 11. Therefore, the single wire portion 22a is shielded in such a manner that it is surrounded by the motor housing 11 between the covering portion 34 formed in a U shape by the top plate portion 34a and the side wall portion 34b.

  Further, as shown in FIG. 2, a tape 36 made of a conductive material is provided from a branch portion of each insulated wire 22 exposed from the braided conductor 23 to an intermediate portion of the shielded wire 21 covered with a covering material 24. It is wound (not shown in FIG. 1 for convenience). This is because, in particular, the branch portion of each insulated wire 22 that is exposed from the braided conductor 23 by being removed from the covering of the covering portion 34 is shielded to further improve the shielding performance of the insulated wire 22.

  The top plate portion 34a is formed so that the tip thereof is inclined radially outward with respect to the axial direction in order to smoothly guide the introduction of the single wire portion 22a by expanding the opening side. is there.

  Here, the assembly mode when the shielded electric wire 21 is electrically connected to the feeder 14 will be described. First, the braided conductor 23 is peeled off together with the covering material 24 at the end of the shielded electric wire 21. Next, the terminal 25 is fixed with caulking to the tip (core wire) of each single wire portion 22a that can be branched into three. Next, the tape 36 is wound from the branch portion of each insulated wire 22 exposed from the braided conductor 23 to the intermediate portion of the shielded wire 21 covered with the covering material 24. Next, the terminal 25 fixed to the tip of the single wire portion 22a is individually connected to the power supply line 14 by fastening. Thereafter, the plate 31 is fastened to the accommodating portion 13, and the single wire portion 22 a is shielded between the covering portion 34 and the motor housing 11.

As described above in detail, according to the present embodiment, the following effects can be obtained.
(1) In this embodiment, the said covering part 34 suppresses that a noise (switching noise) leaks outside from the single line part 22a by shielding the said single line part 22a between the said motor housings 11. . Thus, the shield of the single wire portion 22a can be performed by the covering portion 34 having a very simple structure integrally provided on the plate 31 made of a conductive material. Further, since the covering portion 34 is provided integrally with the plate 31, an increase in the number of parts can be suppressed.

  (2) In this embodiment, the said cover part 34 has the said top-plate part 34a and a pair of side wall part 34b, and is shape | molded by U shape. Accordingly, the single wire portion 22a is shielded in such a manner that the single wire portion 22a is surrounded by the four sides between the covering portion 34 and the motor housing 11, so that the shielding performance can be improved.

  (3) In the present embodiment, for example, the shield structure of the shielded electric wire 21 can be reduced in space compared to the case where a shield connector is employed. Further, when the terminal 25 of the insulated wire 22 is introduced into the motor housing 11 (accommodating portion 13) and connected to the power supply line 14, each insulated wire 22 (single wire portion 22a) is separated, so that it can be easily assembled. Can be secured.

  (4) In this embodiment, when the terminal 25 is fixed to the tip of each single wire portion 22a, each insulated wire 22 (single wire portion 22a) is separated, so that the operation can be performed smoothly.

In addition, you may change the said embodiment as follows.
In the embodiment, at least one of the pair of side wall portions 34b may be omitted.

-In the said embodiment, the insulated wire 22 with which the shield wire 21 is provided may be 1, 2, or 4 or more.
In the embodiment, the polarity switching with respect to the power supply line 14 may be, for example, switching between a predetermined negative potential and a positive potential, or between a predetermined positive potential and a ground potential. Switching may be used.

  The present invention may be applied to multiphase motors other than three phases (for example, a five-phase stepping motor).

(A) and (b) are the top view and sectional drawing which show one Embodiment of this invention. The top view which shows the same embodiment. The circuit diagram which shows a brushless motor.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Brushless motor as an electric motor, 11 ... Motor housing as a housing, 13 ... Housing, 14 ... Feeding wire, 21 ... Shielded wire, 22 ... Insulated wire, 22a ... Single wire portion, 23 ... Braided conductor, 24 ... Covering material , 25... Terminal as a terminal portion, 26... Connection portion, 31... Plate as a protective member, 33... Main body portion, 34 ... Cover portion, 34 a.

Claims (4)

A shielded wire in which the insulated wire is covered with a braided conductor, and the terminal portion of the insulated wire exposed from the braided conductor is connected to the power supply line of the motor, and the power supply selectively switches the polarity to the power supply line. In the wire connection structure,
A protective member made of a conductive material that is coupled to a housing made of a conductive material of the electric motor and protects a connection portion between the terminal portion and the power supply line between the housing and the housing;
The shield member has a covering portion that covers the insulated wire exposed from the braided conductor and shields the insulated wire from the housing. In the shielded wire connection structure according to claim 1,
A shielded wire connection structure, wherein the insulated wires covered with the braided conductor are plural. In the connection structure of the shielded electric wire according to claim 1 or 2,
The covering portion is
A top plate extending along the axis of the housing;
A connection structure for a shielded electric wire, comprising a pair of side wall portions extending continuously toward both sides of the top plate portion toward the housing. In the connection structure of the shielded electric wire according to any one of claims 1 to 3,
A shielded wire connection structure, wherein the insulated wire exposed from the braided conductor is wound with a tape made of a conductive material.

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