JP2014228317A - Current sensor unit - Google Patents

Abstract

Provided is a current sensor unit in which a bus bar can be easily attached / detached to / from a current sensor with a simple configuration. A current sensor unit (1) includes a first bus bar (10) and a first current sensor (50), and the first current sensor (50) includes a first through hole (52) and a first protruding piece (91). The first bus bar 10 includes a first insertion hole 13a, the first bus bar 10 penetrates the first through hole 52, and the first bus bar 10 is tilted with the opening edge of the first through hole 52 as a fulcrum. In a state where the first bus bar 10 is elastically deformed, the fitted state between the first protruding piece 91 and the first insertion hole 13a is released, and the first bus bar 10 can be moved in the penetrating direction. Is inserted into the first insertion hole 13a in a state where the first bus bar 10 is not elastically deformed, and the first bus bar 10 is moved in the penetration direction. Regulated . [Selection] Figure 7

Description

  The present invention relates to a current sensor unit.

  For example, in a hybrid vehicle, a magnetic detection type current sensor is known for detecting a current value for energizing a bus bar connecting a motor and an inverter. In a magnetic detection type current sensor, in order to detect a current value by a magnetic field (bus bar magnetic field) generated around the bus bar, it is necessary to fix the bus bar in the penetrating direction with the bus bar penetrating the current sensor.

  Conventionally, as a method of fixing the bus bar to the current sensor, a method of fixing the bus bar by thermally melting a resin convex portion constituting the current sensor is known (see Patent Document 1). A method of fixing a bus bar by screwing it to a current sensor is known (see Patent Document 2). A method of fixing a bus bar by insert molding is known (see Patent Document 3).

JP 2010-223868 A JP 2010-243440 A JP 2011-133314 A

  However, the technique of Patent Document 1 requires a heat treatment facility that heat-melts the convex portion, the technique of Patent Document 2 increases the number of screw parts, and the technique of Patent Document 3 has a high degree of difficulty in insert molding. There is an inconvenience.

  Therefore, an object of the present invention is to provide a current sensor unit in which a bus bar can be easily attached / detached to / from a current sensor with a simple configuration.

  As means for solving the above-mentioned problems, the present invention provides a current sensor unit comprising: an elastically deformable bus bar; and a current sensor that measures an amount of current that is supplied to the bus bar by a magnetic flux generated around the bus bar. The current sensor is provided at a predetermined distance from a through hole through which the bus bar passes and an opening of the through hole, and is orthogonal to the through direction of the through hole and protrudes in the elastic deformation direction of the bus bar. The bus bar includes a hole portion into which the protruding piece is inserted, the bus bar penetrates through the through hole, and the bus bar is tilted with the opening edge of the through hole as a fulcrum. In a state where the bus bar is elastically deformed, the fitting state between the protruding piece and the hole is released, and the bus bar can be moved in the penetrating direction. An electric current characterized in that, in a state where the bus bar passes through the through hole and the bus bar is not elastically deformed, the protruding piece is inserted into the hole and movement in the through direction of the bus bar is restricted. It is a sensor unit.

According to such a configuration, in a state where the bus bar penetrates the through hole, and the bus bar is inclined and the bus bar is elastically deformed with the opening edge portion of the through hole as a fulcrum, the fitting state between the protruding piece and the hole portion Is released, and the bus bar can be moved in the penetration direction.
On the other hand, in a state where the bus bar penetrates the through hole and the bus bar is not elastically deformed, the protruding piece is inserted into the hole, and the movement of the bus bar in the penetrating direction is restricted.
In this manner, the bus bar can be attached / detached to / from the current sensor with a simple configuration that includes the protruding piece and the hole and uses the elasticity of the bus bar.

  In the current sensor unit, it is preferable that the protruding piece is disposed on the inlet side of the through hole.

  According to such a configuration, since the protruding piece is arranged on the inlet side of the through hole, when the bus bar is passed through the through hole, the bus bar is held while holding the inlet side of the bus bar and inserting the bus bar into the through hole. It can be elastically deformed. In other words, the bus bar can be inserted and deformed while gripping a part of the bus bar, and the workability of mounting the bus bar is improved.

  Further, in the current sensor unit, the current sensor includes a core disposed so as to surround the bus bar, and a plate-like substrate on which the magnetic detection element for detecting the magnetism is mounted, and the substrate includes the through-hole. It is preferable that the protrusion protrudes from the core in the direction, and the protruding piece is disposed on the protruding side of the substrate.

  According to such a configuration, since the substrate protrudes from the core in the penetration direction, a space is formed on the protruding side of the core of the through hole (the rear side in the embodiment described later). And since the protrusion piece is arrange | positioned at the said protrusion side, the said space can be used effectively.

  Further, the current sensor unit includes a plurality of the bus bars, a plurality of the current sensors, and a plurality of the protruding pieces, so as to prevent erroneous assembly of the plurality of bus bars and the plurality of current sensors. The offset amount of the protruding piece from the center of the through hole is preferably different.

  According to such a configuration, since the offset amount of the protruding piece from the center of the through hole is different, it is possible to prevent erroneous assembly of the plurality of bus bars and the plurality of current sensors.

  According to the present invention, it is possible to provide a current sensor unit in which a bus bar can be easily attached / detached to / from a current sensor with a simple configuration.

It is a top view of the current sensor unit concerning this embodiment. It is a perspective view of the current sensor unit concerning this embodiment. It is a perspective view of the current sensor unit concerning this embodiment. It is a perspective view of the current sensor unit concerning this embodiment. It is a top view of the current sensor unit concerning this embodiment. It is a bottom view of the current sensor unit according to the present embodiment. It is sectional drawing of the current sensor unit which concerns on this embodiment, and respond | corresponds to the X1-X1 line cross section of FIG. It is sectional drawing of the current sensor unit which concerns on this embodiment, and respond | corresponds to the X2-X2 line cross section of FIG. It is a perspective view of the current sensor unit concerning this embodiment. It is a perspective view of the current sensor unit concerning this embodiment. It is sectional drawing explaining the assembly | attachment condition of the current sensor unit which concerns on this embodiment, and has shown the time of the insertion start of the 1st bus bar. It is sectional drawing explaining the assembly | attachment condition of the current sensor unit which concerns on this embodiment, and has shown the time of the elastic deformation of a 1st bus bar. It is sectional drawing explaining the assembly | attachment condition of the current sensor unit which concerns on this embodiment, and has shown the time of the non-deformation of a 1st bus bar.

  An embodiment of the present invention will be described with reference to FIGS.

≪Configuration of current sensor unit≫
The current sensor unit 1 is mounted on an electric vehicle such as a hybrid vehicle, an electric vehicle, or a fuel cell vehicle, and connects three inverters 101 that generate three-phase alternating current and a motor (not shown) that generates driving force. And a unit for detecting a current value for energizing each bus bar.

  The current sensor unit 1 includes three bus bars, a first bus bar 10, a second bus bar 20, and a third bus bar 30, a current sensor assembly 40, a first projecting piece 91, a second projecting piece 92, and a third projecting bar. Piece 93.

<Bus bar>
The first bus bar 10, the second bus bar 20, and the third bus bar 30 are thin plate pieces made of metal such as a copper alloy, and are elastically deformable in the thickness direction and have conductivity. The first bus bar 10, the second bus bar 20, and the third bus bar 30 correspond to the U phase, the V phase, and the W phase that constitute a three-phase alternating current. The first bus bar 10, the second bus bar 20, and the third bus bar 30 are inserted from the rear to the front of the current sensor assembly 40 and pass through the current sensor assembly 40. The rear ends of the first bus bar 10, the second bus bar 20, and the third bus bar 30 are on the inverter 101 side, and the front ends are on the motor side.

<First bus bar>
The first bus bar 10 is configured to be longer than a first through hole 52 of the first current sensor 50 described later, and protrudes forward and backward of the first through hole 52 when the first bus bar 10 is inserted through the first through hole 52. (See FIGS. 5 and 6). The first bus bar 10 includes a first front projecting portion 11, a first through-hole inner portion 12, and a first rear projecting portion 13 in order from the distal end side (front side) that is the insertion side.

  The first through-hole inner portion 12 is a portion disposed in the first through-hole 52 when the first bus bar 10 is attached to the first current sensor 50 in a predetermined manner. The first front projecting portion 11 is a portion projecting to the outside on the front side of the first through-hole inner portion 12 (exit side of the first through-hole 52). The first rear projecting portion 13 is a portion projecting to the outside on the rear side of the first through hole inner portion 12 (the inlet side of the first through hole 52).

  The first rear projecting portion 13 is formed with a first insertion hole 13a (hole) extending in the vertical direction. That is, the first insertion hole 13 a is arranged on the inlet side of the first through hole 52. The first insertion hole 13a is a hole into which the first projecting piece 91 is inserted from above (see FIG. 7). When the first projecting piece 91 is inserted into the first insertion hole 13a, the first bus bar 10 has a front-rear direction ( The movement in the first bus bar 10 and the first through hole 52 in the penetrating direction) is regulated.

<Second bus bar>
The second bus bar 20 has the same configuration as the first bus bar 10, and includes a second front projecting portion 21, a second through-hole inner portion 22, and a second rear projecting portion 23. A second insertion hole 23 a (hole) is formed in the second rear projecting portion 23. The second insertion hole 23a is a hole into which the second protruding piece 92 is inserted.

<Third bus bar>
The third bus bar 30 has the same configuration as the first bus bar 10, and includes a third front projecting portion 31, a third through-hole inner portion 32, and a third rear projecting portion 33. The third rear projecting portion 33 is formed with a third insertion hole 33a (hole). The third insertion hole 33a is a hole into which the third protruding piece 93 is inserted.

<Current sensor assembly>
The current sensor assembly 40 includes a first current sensor 50, a second current sensor 60, and a third current sensor 70, and these are assembled to be integrated. Specifically, the first housing 51 (see FIG. 7) of the first current sensor 50, the second housing 61 of the second current sensor 60, and the third housing 71 of the third current sensor 70 are made of resin. Therefore, the first current sensor 50, the second current sensor 60, and the third current sensor 70 are integrally formed.

The first current sensor 50 is a sensor that detects the value of current that flows through the first bus bar 10. The second current sensor 60 is a sensor that detects a current value for energizing the second bus bar 20. The third current sensor 70 is a sensor that detects a current value for energizing the third bus bar 30.

<First current sensor>
The first current sensor 50 includes a first housing 51, a first core 55, and a plate-like substrate 56. The substrate 56 extends in the left-right direction and is shared by the first current sensor 50, the second current sensor 60, and the third current sensor 70.

<First current sensor-first housing>
The first housing 51 is a resin casing, and houses the first core 55 and the substrate 56 therein. The first housing 51 has a first through hole 52 that extends in the front-rear direction and through which the first bus bar 10 passes in the front-rear direction. The first upper wall portion 53 of the first housing 51 disposed above the first through hole 52 extends rearward from the inlet (rear opening) of the first through hole 52. The first lower wall portion 54 of the first housing 51 disposed below the first through hole 52 extends forward from the outlet (front opening) of the first through hole 52.

  The vertical height ΔT52 of the first through hole 52 corresponding to the thickness direction of the first bus bar 10 is larger than the thickness ΔT10 of the first bus bar 10, and the first bus bar 10 has the first through hole 52 in an oblique state. Can be penetrated (see FIG. 13).

  That is, when the 1st bus bar 10 penetrates in the diagonal state which becomes gradually high in the front side, the 1st bus bar 10 is the 1st back corner part 54a (through-hole of the 1st lower wall part 54 arranged under the entrance. And the first front corner portion 53a of the first upper wall portion 53 disposed above the outlet (see FIG. 13).

<First current sensor-first core>
The first core 55 has a C shape with an opening on the right side when viewed from the front (see FIG. 8), and is disposed so as to surround the first bus bar 10 and the substrate 56. In FIG. 8, the first housing 51 and the like are omitted. The first core 55 is a magnetic path formed of an appropriate magnetic material, and is for increasing the magnetic flux density.

<First current sensor-substrate>
The board 56 detects the magnetic value (the strength of the magnetic force) generated around the first bus bar 10 by energizing the first bus bar 10 and detects the current value of the current flowing through the first bus bar 10. . The substrate 56 includes a first magnetic detection element 57 that detects magnetism, and the first magnetic detection element 57 is configured by a Hall element using the Hall effect. The first magnetic detection element 57 (substrate 56) outputs an electromotive voltage proportional to the magnetic flux density to an external ECU (not shown).

  The substrate 56 protrudes rearward from the first core 55 in the front-rear direction (through direction of the first through hole 52) (see FIG. 7). Correspondingly, the first upper wall portion 53 of the first housing 51 also protrudes rearward from the first core 55. The first protruding piece 91 is disposed on the protruding side (rear side) of the substrate 56. That is, since the substrate 56 (first upper wall portion 53) protrudes rearward, a space is formed below the substrate 56 (first upper wall portion 53) and behind the first through hole 52, and Since the first protruding piece 91 is disposed in this space, the space is effectively used.

<Second current sensor>
The second current sensor 60 has the same configuration as the first current sensor 50, and includes a second housing 61, a second core 65, and a part of the substrate 56 (see FIG. 7). The second housing 61 has a second through hole 62 that extends in the front-rear direction and through which the second bus bar 20 passes in the front-rear direction.

<Third current sensor>
The 3rd current sensor 70 is the same composition as the 1st current sensor 50, and is provided with the 3rd housing 71, the 3rd core 75, and a part of substrate 56 (refer to Drawing 7). The third housing 71 has a third through hole 72 that extends in the front-rear direction and through which the third bus bar 30 passes in the front-rear direction.

<First protruding piece>
The first protruding piece 91 is an elongated cylindrical body that is inserted into the first insertion hole 13 a and is made of a resin that is integral with the first housing 51. The first protruding piece 91 is disposed behind (inlet side) the first through hole 52 (see FIGS. 7 and 10) and protrudes downward from the first upper wall portion 53. That is, the 1st protrusion piece 91 protrudes below from the 1st upper wall part 53 which opposes the 1st back corner | angular part 54a in the up-down direction.

  Thus, since the 1st protrusion piece 91 is arrange | positioned at the entrance side of the 1st through-hole 52, when the 1st bus-bar 10 is elastically deformed when the 1st bus-bar 10 is assembled | attached to the 1st current sensor 50, the 1st The bus bar 10 can be bent and elastically deformed without changing, and the assembling work is good.

  On the other hand, when the 1st protrusion piece 91 is arrange | positioned at the exit side of the 1st through-hole 52, it is necessary to hold | grip and elastically deform the 1st bus-bar 10 which protrudes from the exit side of the 1st through-hole 52. , It takes time and effort.

  The projecting length ΔL91 of the first projecting piece 91 is longer than the vertical height ΔT52 of the first through hole 52, and even if the undeformed first bus bar 10 is in an oblique state at the first through hole 52, the first The length of the protruding piece 91 is set to be inserted into the first insertion hole 13a (see FIG. 13). That is, when the first bus bar 10 is slanted and undeformed (in a straight line when viewed from the side) with the first rear corner portion 54a and the first front corner portion 53a as fulcrums, the first protruding piece 91 is inserted into the first bus bar 10. The length is set to be inserted into the hole 13a. That is, the protrusion length ΔL91 of the first protruding piece 91 becomes longer as the distance from the outlet of the first through hole 52 increases.

  And if the 1st protrusion piece 91 is inserted in the 1st insertion hole 13a, the movement in the front-back direction of the 1st bus-bar 10 will be controlled. Thereby, the 1st bus bar 10 is prevented from dropping from the 1st current sensor 50 after that.

  The protrusion length ΔL91 of the first protruding piece 91 is obtained when the first bus bar 10 is deformed by bending the first rear protruding portion 13 downward with the first rear corner portion 54a as a fulcrum (first rear protruding portion). 13), the first projecting piece 91 is set to a length that allows the first bus bar 10 to move in the front-rear direction. That is, the protrusion length ΔL91 of the first protruding piece 91 is reduced as the rigidity of the first bus bar 10 is high and the first bus bar 10 becomes difficult to deform.

<Second protruding piece>
Similar to the first projecting piece 91, the second projecting piece 92 is an elongated cylindrical body that is inserted into the second insertion hole 23a. The 2nd protrusion piece 91 is arrange | positioned in the back (inlet side) of the 2nd through-hole 62 (refer FIG. 7, FIG. 10), and protrudes below from the 2nd upper wall part.

<Third protruding piece>
The third protruding piece 93 is an elongated columnar body that is inserted into the third insertion hole 33a, like the first protruding piece 91. The 3rd protrusion piece 93 is arrange | positioned in the back (entrance side) of the 3rd through-hole 72 (refer FIG. 7, FIG. 10), and protrudes below from the 3rd upper wall part.

<Offset amount of the first protruding piece, etc.>
As shown in FIG. 5, from the first central axis O52 (center of the first through hole 52) of the first through hole 52 (first through hole inner portion 12) of the first protruding piece 91 (first insertion hole 13a). A first offset amount ΔL91 of the second projecting piece 92 (second insertion hole 23a), a second offset amount ΔL92 from the second central axis O62 of the second through hole 62 (second through hole inner portion 22), The third offset amount ΔL93 from the third central axis O72 of the third through hole 72 (third through hole inner portion 32) of the third protruding piece 93 (third insertion hole 33a) is different from each other and the same. (ΔL91 ≠ ΔL92 ≠ ΔL93).

  As a result, misassembly is prevented between the first bus bar 10, the second bus bar 20, and the third bus bar 30. That is, for example, the first bus bar 10 cannot be assembled to the second current sensor 60 and the third current sensor 70 whose offset amounts do not match.

  The first protruding piece 91 is offset to the right of the first central axis O52, the second protruding piece 92 is offset to the left of the second central axis O62, and the third protruding piece 93 is offset from the third central axis O72. Offset to the left. That is, the offset direction is reversed between the first projecting piece 91 and the second projecting piece 92 and the third projecting piece 93, so that erroneous assembly is prevented.

≪Assembly method of current sensor unit≫
A method for assembling the current sensor unit 1 will be described with reference to FIGS. Hereinafter, the first bus bar 10 will be described, but the same applies to the second bus bar 20 and the third bus bar 30.

<At the start of insertion>
As shown in FIG. 11, the front side of the first bus bar 10 is inserted into the first through hole 52 while the first bus bar 10 is inclined obliquely so that the front side becomes higher.

<During deformation>
Thereafter, the rear portion of the first bus bar 10 projecting rearward from the first through hole 52 (mainly the first rear projecting portion 13) is moved downward with the first rear corner 54a (opening edge of the through hole) as a fulcrum. (See FIG. 12). If it does so, the 1st bus-bar 10 will curve in an upward convex shape, and will continue insertion, without being caught in the 1st protrusion piece 91. FIG.

<When not deformed>
As shown in FIG. 13, when the first bus bar 10 is inserted to a predetermined position, the bending of the rear portion (mainly the first rear protruding portion 13) of the first bus bar 10 is stopped. Then, the first bus bar 10 springs back due to its rigidity, that is, the first rear protruding portion 13 swings upward, and the first protruding piece 91 is inserted into the first insertion hole 13a. Thereby, the 1st bus bar 10 becomes immovable in the front-back direction. Then, the first bus bar 10 is attached to the first sensor 50.

≪Effect of current sensor unit≫
According to such a current sensor unit 1, the following effects are obtained.
The first projecting piece 91 is an integrally molded product with the first housing 51 and is configured to include the first insertion hole 13a in the first bus bar 10, so the number of parts does not increase. Further, since the configuration is simple, the current sensor unit 1 can be easily manufactured.

  Utilizing the elasticity of the first bus bar 10 itself, the first bus bar 10 is deformed / non-deformed and the insertion / insertion into the first protruding piece 91 is switched, so that the first bus bar 10 can be easily attached and detached. That is, the first bus bar 10 and the first current sensor 50 can be easily attached / detached to each other.

≪Modification≫
As mentioned above, although embodiment of this invention was described, this invention is not limited to this, For example, it can change as follows.

  In the above-described embodiment, the configuration in which the first bus bar 10 has a thin plate shape has been illustrated. However, for example, an elongated round bar shape or an elongated triangular prism shape may be used.

  In the above-described embodiment, the configuration in which the first protruding piece 91 and the first insertion hole 13a are arranged on the inlet side (rear side, front side of the insertion side) of the first through hole 52 is exemplified. The structure arrange | positioned at the exit side (front side, insertion back side) of the through-hole 52 may be sufficient.

  In the above-described embodiment, the configuration in which the first current sensor 50 includes the first core 55 is illustrated. However, for example, a configuration in which the first current sensor 50 does not include the first core 55 may be a coreless type. The same applies to the second current sensor 60 and the third current sensor 70.

DESCRIPTION OF SYMBOLS 1 Current sensor unit 10 1st bus-bar 13 1st back protrusion part 13a 1st insertion hole (hole part)
50 1st current sensor 51 1st housing 52 1st through-hole 54a 1st back corner | angular part (opening edge part of through-hole)
55 First core 56 Substrate 57 First magnetic detection element 91 First protruding piece 101 Inverter O52 First central axis

Claims (4)

An elastically deformable bus bar;
A current sensor for measuring a current amount energized to the bus bar by magnetic flux generated around the bus bar, and a current sensor unit comprising:
The current sensor includes a through hole through which the bus bar passes, and a protruding piece that is provided at a position away from the opening of the through hole by a predetermined distance and is orthogonal to the through direction of the through hole and protrudes in the elastic deformation direction of the bus bar. And comprising
The bus bar includes a hole portion into which the protruding piece is inserted,
In a state where the bus bar penetrates the through hole, and the bus bar is tilted and the bus bar is elastically deformed with the opening edge of the through hole as a fulcrum, the fitting state between the protruding piece and the hole portion is Released, allowing the bus bar to move in the penetration direction,
In a state where the bus bar penetrates the through hole and the bus bar is not elastically deformed, the protruding piece is inserted into the hole portion, and movement in the penetration direction of the bus bar is restricted. Current sensor unit. The current sensor unit according to claim 1, wherein the protruding piece is disposed on an inlet side of the through hole. The current sensor includes a core disposed so as to surround the bus bar, and a plate-like substrate on which a magnetic detection element for detecting the magnetism is mounted,
The substrate protrudes from the core in the penetration direction;
The current sensor unit according to claim 1, wherein the protruding piece is disposed on a protruding side of the substrate. A plurality of the bus bars, a plurality of the current sensors, and a plurality of the protruding pieces,
4. The offset amount of the protruding piece from the center of the through hole is different so as to prevent erroneous assembly of the plurality of bus bars and the plurality of current sensors. 5. The current sensor unit according to item 1.

Images