JP2016095921A - Terminal block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal block capable of improving vibration resistance of a power line.SOLUTION: On a terminal block 10, three-phase power lines 100 are electrically connected, in each of which a power line side terminal 104 is connected to the front end thereof, and which are integrally connected with a coupling member 110. The terminal block 10 includes: an L-shaped bus-bar 16 to which the power line side terminal 104 is fixed; and a regulation part 18 that, when the power line side terminal 104 is fixed to the L-shaped bus-bar 16, comes into contact with the power line 100 between the coupling member 110 and the power line side terminal 104 to restrict the power line 100 from moving.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a terminal block electrically connected to a three-phase power line.

  A power line for supplying electric power from a power source is connected to a rotating electrical machine such as a motor. Generally, one end of the power line is fastened to a stator coil, and the other end of the power line is fastened to a terminal block attached to a motor case. Further, in many cases, a power line side terminal is attached to the other end of the power line, and this power line side terminal is bolted to a bus bar provided on the terminal block.

  Here, in the case of a rotating electrical machine having a three-phase stator coil such as a three-phase motor, there are three power lines, that is, three power lines. Conventionally, when connecting these three power lines to the terminal block, each of the three power lines has been positioned according to the position of the corresponding bus bar. In order to reduce this positioning effort, in part, it has been proposed to connect the three power lines to each other to fix the relative positional relationship between the power lines. For example, Patent Document 1 discloses a fixing member (connecting member) having three fixing holes into which three power lines are fitted. By using such a fixing member to fix the relative positional relationship between the three power lines, the positioning effort for each power line can be reduced.

JP 2014-128095 A

  However, the conventional configuration has a problem that the vibration resistance of the power line is poor. That is, in the conventional configuration, among the power lines, only the coupling portion with the power line side terminal is fixed to the terminal block. Since the connecting portion of the power line is subjected to a strong pressure to be caulked and connected to the power line side terminal, the strength is weakened.

  Here, when the stator and the fixing member vibrate, the power lines connected to them also shake. In this case, stress is applied to the portion of the power line fixed to the terminal block, that is, the caulking joint. As described above, the caulking joint portion is poor in strength as compared with other parts, and there is a possibility that the power line is broken or detached when stress is applied to such a part.

  Therefore, an object of the present invention is to provide a terminal block that can further improve the vibration resistance of power lines.

  The terminal block of the present invention is a terminal block to which a power line side terminal is coupled to each end and a three-phase power line integrated by being coupled by a coupling member is electrically connected, When the power line side terminal is fastened, and when the power line side terminal is fastened to the bus bar, the power line abuts between the connecting member and the power line side terminal to move the power line. And a regulation unit that regulates the above.

  According to the present invention, since the restricting portion for restricting the movement of the power line is provided between the connecting member and the power line side terminal on the terminal block, stress is applied to the coupling portion between the power line and the power line side terminal. This can be prevented and the vibration resistance of the power line can be improved.

It is a perspective view of the terminal block which is embodiment of this invention. It is sectional drawing in the vicinity of a control part. It is AA sectional drawing of FIG. (A) is a figure which shows the motion of the power line accompanying a vibration in the case of having a control part, (b) is a figure which shows the motion of the power line with the vibration in the case of not having a control part. It is a figure which shows an example of another control part.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a terminal block 10 according to an embodiment of the present invention. 2 is a cross-sectional view in the vicinity of the restricting portion 18, and FIG. 3 is a cross-sectional view taken along the line AA in FIG.

  This terminal block 10 is used to connect a three-phase rotating electrical machine and a power source, and is attached to a case of the rotating electrical machine. First, the power line 100 connected to the terminal block 10 will be briefly described. The power lines 100 are provided for three phases, that is, three, and are connected to the three-phase stator coils of the rotating electrical machine. One end of each power line 100 is connected to a corresponding stator coil by means such as welding. The power line side terminal 104 is fastened to the other end of each power line 100. Hereinafter, a portion of the power line 100 that is coupled to the power line side terminal 104 is referred to as a “coupling portion 102”.

  The power line side terminal 104 is a flat plate made of a conductive material such as metal. A bolt insertion hole is formed near the tip of the power line side terminal 104. Further, a caulking portion 106 for caulking and coupling with the power line 100 is provided near the base end of the power line side terminal 104. The caulking portion 106 is a substantially rectangular tongue piece extending outward from the periphery of the power line side terminal 104. When the power line 100 and the power line side terminal 104 are coupled, the caulking portion 106 is connected to the power line side terminal 104 with the coupling part 102 of the power line 100 disposed on the surface of the power line side terminal 104. The coupling portion 102 of the power line 100 is pressed against the surface of the power line side terminal 104 and caulked.

  The three power lines 100 are integrated by a connecting member 110. The connecting member 110 is a substantially block-shaped member made of an insulating resin. The connecting member 110 has three through holes through which the three power lines 100 are inserted. By inserting the power line 100 through the through hole, the relative positional relationship (adjacent spacing) of the three power lines 100 is fixed.

  The terminal block 10 includes a base 12 made of an insulating resin. The base 12 is roughly divided into a power supply side base portion 12a that protrudes outside the case of the rotating electrical machine, and a rotating electrical machine side base portion 12b that protrudes inside the case. The power supply side base portion 12a has a cylindrical shape with a substantially elliptical cross section, and one end thereof is completely opened. An external relay terminal (not shown) is disposed inside the power supply side base portion 12a so as to be exposed to the outside, and a wiring extending from the power supply is connected to the external relay terminal. The rotating electrical machine side base portion 12b is three substantially cylindrical portions protruding from the other end of the power source side base portion 12a. When the terminal block 10 is attached to the case of the rotating electrical machine, three insertion holes are formed in the case in advance, and the three rotating electrical machine side base portions 12b are inserted into the insertion holes from the outside of the case. . During this insertion, an L-shaped bus bar 16 described later is removed from the rotating electrical machine side base portion 12b so as not to obstruct the insertion.

  An internal relay terminal 14 connected to the power line side terminal 104 via the L-shaped bus bar 16 is provided on the upper surface of each rotating electric machine side base portion 12b in an exposed state. The internal relay terminal 14 is a flat plate made of metal having conductivity. The inside of the rotating electrical machine side base portion 12b is hollow, and a conductor (not shown) that electrically connects the internal relay terminal 14 and the external relay terminal inside the rotating electrical machine side base portion 12b. Is arranged.

  An L-shaped bus bar 16 is bolted onto the internal relay terminal 14. The L-shaped bus bar 16 is a member obtained by bending a flat plate made of metal having conductivity into a substantially L shape. That is, the L-shaped bus bar 16 includes a placement surface 16a placed on the internal relay terminal 14 and a standing surface 16b substantially orthogonal to the placement surface 16a. The L-shaped bus bar 16 is bolted to the internal relay terminal 14 so as to stand up from a position near the end of the rotating electrical machine-side base portion 12b. The power line side terminal 104 is bolted to the L-shaped bus bar 16.

  Further, in the present embodiment, a restricting portion 18 that restricts the movement of the power line 100 is provided below the L-shaped bus bar 16. The restricting portion 18 is a portion that protrudes in a direction approaching the power line 100 from the end of each rotating electrical machine side base portion 12b. The restricting portion 18 is integrally formed with the rotating electrical machine side base portion 12b, and is made of an insulating resin, like the rotating electrical machine side base portion 12b. As shown in FIG. 2, a substantially V-shaped cutout 20 is formed at the tip of the restricting portion 18 as it approaches the tip as viewed from above. The base end of the notch 20 has a width substantially the same as the outer diameter of the power line 100, and prevents the power line 100 located at the base end from moving in the left-right direction. When the power line side terminal 104 is fastened to the L-shaped bus bar 16, the restricting portion 18 is located between the power line side terminal 104 and the connecting member 110 (see FIGS. 1 and 3). The base end portion is formed at a position where it abuts against the power line 100. Hereinafter, a portion of the power line 100 that contacts the restriction portion 18 is referred to as a “contact portion 108”.

  By providing the restricting portion 18, the power line 100 can be effectively prevented from being broken. This will be described with reference to FIG. FIG. 4 is an image diagram showing the movement of the power line 100 when the connecting member 110 vibrates. FIG. 4A shows the case where the restricting portion 18 is provided, and FIG. 4B shows the case where the restricting portion 18 is not provided. Each case is shown.

  As is clear from the above description, the connecting member 110 is a member that integrates the three power lines 100, but the connecting member 110 itself is not fixed to other members and can move freely. Yes. When the connecting member 110 vibrates with the driving of the rotating electrical machine, the power line 100 fixed to the connecting member 110 also swings. At this time, as shown in FIG. 4B, when the restricting portion 18 is not provided, a portion of the power line 100 attached to the connecting member 110 swings together with the connecting member 110. On the other hand, the coupling portion 102 coupled to the power line side terminal 104 of the power line 100 tries to stay at that position without swinging, and therefore stress due to vibration is concentrated on the coupling portion 102. It will take. Here, the coupling portion 102 is a portion that is partially deformed by receiving pressure for caulking coupling, and is a portion that has a lower strength than other portions. When stress is concentrated on the coupling portion 102, the coupling portion 102 may be broken or detached from the power line side terminal 104.

  Therefore, in the present embodiment, the restricting portion 18 is provided to prevent stress concentration on the coupling portion 102. That is, when the restricting portion 18 is provided, the power line 100 is disposed in the notch 20 of the restricting portion 18 between the power line side terminal 104 and the connecting member 110, and movement thereof is restricted. The As a result, when the connecting member 110 vibrates, the portion of the power line 100 between the connecting member 110 and the restricting portion 18 swings, but the portion between the restricting portion 18 and the power line side terminal 104 is I can hardly shake. In this case, stress concentrates on the abutting portion 108 that abuts the connecting member 110 in the power line 100, but the abutting portion 108 is stronger than the coupling portion 102, and therefore is not easily broken. . As a result, by providing the restricting portion 18, breakage and detachment of the power line 100 due to vibration can be effectively prevented, and vibration resistance of the power line 100 can be improved.

  When fastening the power line 100 to the terminal block 10, as shown in FIG. 2, with the power line 100 positioned inside the notch 20, the terminal block 10 is connected to the power line 100 side ( Move away from the case). At this time, if the terminal block 10 is advanced to a position slightly protruding from the connecting member 110 toward the stator (in the direction away from the case), an appropriate tension is applied to the power line 100. As a result, the power line 100 swings not only in the arrangement direction of the three restricting portions 18 (the horizontal direction in the drawing in FIG. 2) but also in the direction perpendicular to the arrangement direction (the vertical direction in the drawing in FIG. 2). It becomes difficult. Thereby, breakage and detachment of the power line 100 can be more effectively prevented.

  Furthermore, by providing the restricting portion 18, it is possible to reduce the labor for positioning the power line 100. That is, when the power lines 100 are attached to the terminal block 10, it is necessary to position each power line 100 in accordance with the position of the corresponding L-shaped bus bar 16. The positioning of the three power lines 100 can be easily performed by using the notch 20 provided in the restricting portion 18 as in the present embodiment. That is, when the power line 100 is fastened to the terminal block 10 in the present embodiment, the terminal block is positioned with the power line 100 positioned inside the notch 20 as shown in FIG. 10 is moved to the power line 100 side. During this movement, the power line 100 is guided by the periphery of the notch 20 and approaches the proximal end of the notch 20. And finally, as shown in FIG.2 (b), the position of the three power lines 100 is prescribed | regulated and positioned by the three control parts 18. FIG.

  Here, even in the case where the restricting portion 18 is not provided, the labor of positioning the power line 100 is somewhat reduced by providing the connecting member 110. That is, if the arrangement intervals of the three insertion holes provided in the connecting member 110 coincide with the arrangement intervals of the three L-shaped bus bars 16 provided in the terminal block 10, the positions of the three power lines 100 are individually adjusted. There is no need to perform positioning, and the positioning effort can be greatly reduced. However, actually, since the connecting member 110 is a separate member from the terminal block 10, it is difficult to completely match the arrangement interval of the insertion holes with the manufacturing variation of the terminal block 10. As a result, even when the connecting member 110 is used, it is necessary to finely adjust the position of each power line 100 individually. On the other hand, in the present embodiment, the restricting portion 18 is provided on the terminal block 10. Therefore, it is easy to cope with variations in the arrangement interval of the L-shaped bus bars 16 provided on the same terminal block 10, and it is possible to reduce the trouble of individually adjusting the positions of the power lines 100.

  As described above, according to the present embodiment, the vibration resistance of the power line 100 can be improved, and the effort for positioning the power line 100 can be reduced. The configuration described here is merely an example, and the restricting portion 18 that contacts the power line 100 and restricts the movement of the power line 100 between the connecting member 110 and the power line side terminal 104 is provided on the terminal block. As long as it is provided in 10, other configurations may be changed as appropriate. For example, in this embodiment, the restricting portion 18 is integrally formed with the rotating electrical machine side base portion 12b. However, if the restricting portion 18 is provided on the terminal block 10, it is separated from the rotating electrical machine side base portion 12b. It may be. Further, in the present embodiment, the power line side terminal 104 and the power line 100 are caulked and coupled, but if they are coupled to each other, they may be coupled by other methods such as welding. . Further, the shape of the notch 20 provided in the restricting portion 18 may be appropriately changed according to the required position accuracy, the shape of the power line 100, and the like. For example, as illustrated in FIG. 5A, the notch 20 may be wider than the power line 100. Moreover, in this embodiment, although the periphery of the notch 20 is made into the curve which connected the circular arc, as shown in FIG.5 (b), the periphery of the notch 20 may be formed in a straight line.

  10 terminal block, 12 base, 12a power supply side base, 12b rotating electrical machine side base, 14 internal relay terminal, 16 L-shaped bus bar, 18 regulating part, 20 notch, 100 power line, 102 coupling part, 104 power line side Terminal, 106 Caulking part, 108 Abutting part, 110 Connecting member.

Claims (1)

A power line side terminal is coupled to each tip and a three-phase power line integrated by being coupled by a coupling member is an electrically connected terminal block,
A bus bar to which the power line side terminal is fastened;
When the power line side terminal is fastened to the bus bar, between the connecting member and the power line side terminal, the power line side terminal is brought into contact with the power line, and a regulation part that regulates the movement of the power line;
A terminal block comprising:

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