JP3516255B2 - Current sensor protection structure in electric junction box for EV - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current sensor protection structure in an electric junction box for an electric vehicle (hereinafter referred to as EV).

[0002]

2. Description of the Related Art Conventionally, a current sensor 80 as shown in FIG. 13 has been proposed. This current sensor 80 has a sensor body 81.
And a through hole 82 formed in the sensor body 81, and a controller (not shown) for detecting the direction of current flowing through the bus bar 83 inserted into the through hole 82. The direction of the current flowing through the bus bar 83 (the direction of the arrow in the figure) can be kept constant by the control unit.

However, since a vehicle (not shown) equipped with an electric connection box for EV (not shown) in which the current sensor 80 is arranged sways during traveling, the bus bar 83 and / or
Vibration propagates to the current sensor 80. As a result, the current sensor 80 itself shakes and the opening edge 82a of the through hole 82 contacts the corner portion 83a of the bus bar 83. Alternatively, as shown in FIG. 14, the bus bar 83 sways and the opening edge 8 of the through hole 82 moves.
There was a risk that the corner portion 83a would contact the 2a. for that reason,
There is a risk that abnormal noise (striking sound or rubbing noise) may occur, the opening edge 82a of the through hole 82 may be damaged, or the control unit itself may be damaged. Further, as shown in FIG. 15, even when the electric wire 84 is inserted into the through hole 82, there is a similar problem that the outer peripheral surface 84a of the electric wire 84 and the opening edge 82a of the through hole 82 contact each other.

[0004]

In view of the above points, the present invention provides an electric connection box for an EV for preventing contact between an opening edge of a through hole formed in a current sensor and a corner of a bus bar when the vehicle is traveling. It is an object of the present invention to provide a current sensor protection structure.

[0005]

In order to achieve the above object, according to the present invention, a bus bar is inserted into a through hole formed in a block-shaped sensor body, and a current direction or current value flowing in the bus bar is detected. prevention in current sensor protective structure in the EV electric junction box, during running of the vehicle was <br/> electrical connection box for E V is assembled, the opening edge of the through hole, the contact between the corner of the bus bar buffering member is attached to the contact-preventing surfaces of the bus bar corresponding to the vicinity of the outside of each side opening of the through hole and the through hole, the cross section of the cushioning member, the
It is smaller than the opening of the through hole, and
The current sensor protection structure in the electric connection box for EV is basically formed with play between the peripheral surface and the opening edge of the through hole (claim 1). The cushioning member includes a current sensor protective structure of the <br/> contact prevention surface wound tape material and has been in an electrical connection box for EV of the bus bars is also effective (claim
2 ). The buffer member, even together employ a current sensor protective structure of the contact prevention surface in a tube-like or frame-like protective material and has been in an electrical connection box for EV assembled of the busbar (claim 3).

[0006]

1 to 4 show a first embodiment of a current sensor protection structure in an electric junction box for an EV according to the present invention. The same components as those in the conventional example are given the same names and detailed description thereof will be omitted. In FIG. 1, this E
In the current sensor protection structure in the electric junction box 1 for V, the through hole 6 is formed in the current sensor 4, the bus bar 10 is inserted into the through hole 6, and the opening edge 7a of the through hole 6 and the corner portion 10 of the bus bar 10 are inserted.
This is a structure in which the bus bar 10 is provided with a cushioning member 20 for preventing contact with a. Reference numeral 2 is a connection box body, and 3 is a cover that covers the connection box body 2. And EV electric junction box 1
Is mounted on a vehicle (not shown).

As shown in FIGS. 1 and 2, the current sensor 4
Has a through hole 6 formed in a block-shaped sensor body 5, and has a control section (not shown) for detecting the current direction or current value in the through hole 6. Busbar 1 by control unit
The direction or current value of the current flowing through 0 is detected (or controlled).

As shown in FIGS. 2 and 3, the cushioning member 20 is
It is attached to the contact prevention surface 11 of the bus bar 10 corresponding to the inside of the through hole 6 and the vicinity of the outsides of the openings 7 on both sides of the through hole 6.
Where the vehicle comes into contact with the opening edge 7a of the through hole 6 when traveling,
Both end faces 11 a, 11 a of the contact prevention face 11 corresponding to the outer sides of the both side openings 7, 7 of the through hole 6 are provided. Therefore, with the intermediate surface 11b of the contact prevention surface 11 corresponding to the inside of the through hole 6 left as it is, the cushioning member 20 is provided only on both end surfaces 11a, 11a.
Can also be attached.

The cross section of the buffer member 20 is smaller than the opening 7 of the 6 through holes. Therefore, a play S is formed between the outer peripheral surface 20a of the cushioning member 20 and the opening edge 7a of the through hole 6. If the vibration during traveling of the vehicle is within the range of the play S, the outer peripheral surface 20a of the cushioning member 20 and the opening edge 7a of the through hole 6 do not come into contact with each other, and the corner portion 10a of the bus bar 10 does not come into contact with the opening edge 7a. . When the vibration exceeds the range of the play S, the outer peripheral surface 20 a of the cushioning member 20 and the opening edge 7 of the through hole 6
a comes into contact. However, the contact prevention surface 11 has a cushioning member 2
Since it is protected by 0, the contact prevention surface 11 does not directly contact the opening edge 7a.

As a result, contact between the corner portion 10a of the bus bar 10 and the opening edge 7a of the through hole 6 is prevented. Therefore, damage to the current sensor 4 can be prevented, and generation of abnormal noise due to contact between the opening edge 7a of the through hole 6 and the corner 10a of the bus bar 10 can be suppressed. Further, contact between the control unit of the current sensor 4 and the bus bar 10 can be prevented.

In this embodiment, the buffer member 20 is a tape material 22 made of PVC (polyvinyl chloride), butyl or silicon.
Is. As a guide for winding the tape material 22, as shown in FIG. 4, the total tape width D including the contact prevention surface 11 is about 20.
mm, and the maximum tape thickness T is about 2 mm. Cushioning member 20
If the tape material 22 is used as the tape material 22, the cost of the tape material 22 can be reduced, and the manufacturing cost of the electric junction box 1 for EV shown in FIG. 1 can be reduced. Further, since the tape material 22 is only wound around the contact prevention surface 11, the work of attaching the buffer member 20 to the contact prevention surface 11 is easy.

FIG. 5 and FIG. 6 show a second embodiment of the structure for protecting the current sensor in the electric junction box for EV according to the present invention. The same components as those in the first embodiment are designated by the same names and reference numerals, and detailed description thereof will be omitted. As shown in FIG. 5, the cushioning member 20 of the present embodiment is a tubular protective member 25 assembled to the contact prevention surface 11 of the bus bar 10.

The tube-shaped protective material 25 is, for example, a corrugated tube, a polyvinyl chloride tube, or a heat-shrinkable tube. An insertion hole 26 is formed in the protective material 25 in the axial direction. As a method of assembling the contact prevention surface 11 into the insertion hole 26, the bus bar 10 is directly inserted into the insertion hole 26 and moved to the contact prevention surface 11. Alternatively, the protective material 25 is formed with an insertion cut 27 parallel to the axial direction, and the contact prevention surface 11 of the bus bar 10 is directly pushed into the insertion cut 27 to be assembled in the insertion hole 26. As shown in FIG. 6, the cross section of the protective material 25 assembled to the contact prevention surface 11 is smaller than the opening 7 of the through hole 6. If the protective material 25 is made to have elasticity, the protective material 25 is attached to the contact prevention surface 1.
Can be closely attached to 1.

As shown in FIG. 7, the buffer member 20 may be a frame-shaped protective member 28. The frame-shaped protective material 28 is made of urethane, rubber, foamed rubber, or synthetic resin, for example. The protective material 28 is a frame body 29 having a rectangular cross section.
An insertion hole 30 is formed in the upper wall 30a of the frame body 29, and an insertion cut 31 parallel to the axial direction is provided in the upper wall 30a. As shown in Figure 8,
The cross section of the protective material 28 assembled to the contact prevention surface 11 is smaller than the opening 7 of the through hole 6.

As shown in FIGS. 7 and 8, the contact prevention surface 1
In order to assemble the protective material 28 to 1, the bus bar 10 is inserted into the insertion hole 30 and moved to the contact prevention surface 11. Or
The contact prevention surface 11 of the bus bar 10 is directly pushed into the insertion notch 31 and assembled into the insertion hole 30.

Further, as shown in FIG. 9, the frame body 29 is divided into a left frame body 33a and a right frame body 33b. As shown in FIG. 10, the left frame member 33 is first attached to the contact prevention surface 11 of the bus bar 10.
It is also possible to directly assemble a and then the right frame 33b respectively.

Further, as the cushioning member 20, a protective material 35 as shown in FIG. 11 can be used. The protective material 35 is the frame body 36.
Is formed into an elliptical cross section, and the insertion holes 37 are formed in the frame body 36.
It is also possible to form the insertion notch 38 parallel to the axial direction in the frame main body 36 while providing the above. As a modification,
As shown in FIG. 12, a protective member 39 divided into a left frame body 40a and a right frame body 40b is also possible.

[0018]

As above, according to the present invention, according to the first aspect of the invention, the buffer member is attached to the contact-preventing surfaces of the bus bar corresponding to the vicinity of the outside of each side opening of the through hole and the through-hole. As a result, even if the cushioning member comes into contact with the opening edge of the through hole due to vibration during traveling of the vehicle, the contact prevention surface of the bus bar and the opening edge of the through hole do not come into direct contact with each other. Therefore, as compared with the related art, it is possible to suppress the damage of the current sensor and the abnormal noise caused by the contact between the corner portion of the bus bar and the opening edge of the through hole.

Further, can be inserted from the cross section of the cushioning member is made smaller than the opening of the through-hole, easily even after mounting the cushioning member to the contact-preventing surfaces of the bus bar to bus bar into the through hole. A play is formed between the outer peripheral surface of the cushioning member and the opening edge of the through hole. As a result, for example, when the vibration of the bus bar or the current sensor is within the play range when the vehicle is traveling, contact between the contact prevention surface of the bus bar and the opening edge of the through hole is reliably prevented. Even if the vibration is outside the play range, the contact between the outer peripheral surface of the cushioning member and the opening edge of the through hole causes the contact preventing surface or corner of the bus bar and the opening edge of the through hole to directly contact each other. Contact is prevented.

According to the second aspect of the present invention , since the buffer member is the tape material, the tape material can be easily wound around the contact preventing surface of the bus bar. This makes it possible to reduce the cost of the cushioning member. According to the third aspect of the invention , since the cushioning member is the tubular or frame-shaped protective material, the protective material is assembled to the contact prevention surface of the busbar by inserting the busbar into the protective material, for example. This makes it possible to easily attach the cushioning member to the bus bar.

[0021]

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of a current sensor protection structure in an electric junction box for EV according to the present invention.

FIG. 2 is a sectional view taken along line XX in FIG.

3 is a cross-sectional view taken along the line YY in FIG.

FIG. 4 is an enlarged sectional view of a cushioning member in FIG.

FIG. 5 is a perspective view showing a second embodiment of the current sensor protection structure in the electric junction box for EV according to the present invention, and an enlarged tube-shaped protective material as a cushioning member of the second embodiment.

6 is a cross-sectional view of a state in which the protective material in FIG. 5 is inserted into a through hole.

FIG. 7 is an enlarged perspective view of a frame-shaped protective member as another cushioning member in the second embodiment.

8 is a cross-sectional view showing a state in which the protective material in FIG. 7 is inserted into a through hole.

9 is a perspective view showing a modified example of FIG. 7. FIG.

FIG. 10 is a perspective view showing a state in which a bus bar is attached to the protective member of FIG.

FIG. 11 is a perspective view showing a protective material having a frame body having an elliptical cross section.

FIG. 12 is a perspective view showing a modified example of FIG.

FIG. 13 is a perspective view showing a state in which a bus bar is inserted in a conventional current sensor.

14 is a sectional view taken along line ZZ in FIG.

FIG. 15 is a cross-sectional view showing a state where an electric wire is inserted in the current sensor of FIG.

[Explanation of symbols]

1 EV Electric Connection Box 4 Current Sensor 5 Sensor Body 6 Through Hole 7 Opening 7a Opening Edge 10 Bus Bar 10a Corner 11 Contact Prevention Surface 20 Buffer Member 20a Outer Surface 22 Tape Material 25, 28, 35, 39 Protective Material S Play

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-9-8080 (JP, A) JP-A 8-217129 (JP, A) JP-A 11-164449 (JP, A) JP-A 11- 164447 (JP, A) Actual development Sho 64-42465 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B60L 11/18 H02G 3/16

Claims (3)

(57) [Claims] 1. A bus bar in a through hole formed in a block-like sensor body is inserted, the current sensor protective structure EV for the electrical connection box for detecting the current direction or the current value flowing through the bus bar, for E V during running of the vehicle electrical connection box is assembled, the opening edge of the through hole, cushioning member to prevent contact between the corner of the bus bar is, the vicinity of the outside of each side opening of the through hole and the through hole Is attached to the contact prevention surface of the bus bar , and the buffer member has a cross section smaller than the opening of the through hole.
And the outer peripheral surface of the cushioning member and the through hole.
E with a play formed between it and the opening edge
Current sensor protection structure in the electric junction box for V. 2. The buffer member is the contact member of the bus bar.
The current sensor protection structure in the electric junction box for EV according to claim 1, wherein the tape material is wound around the touch-prevention surface . 3. The buffer member is the contact member of the bus bar.
Tube-shaped or frame-shaped protective material that is attached to the touch-prevention surface
And by the current sensor protective structure according to claim 1 EV for the electrical connection box according to, characterized in that the.