JP4439992B2 - Current sensor and method of attaching current sensor - Google Patents

Description

  The present invention relates to a current sensor attached to a harness.

  For example, when driving various loads mounted on an automobile or the like, the current is measured by a current sensor and used for control parameters of each device such as a generator.

As a current sensor used in this case, there is one using a magnetic core and a Hall element as described in Patent Document 1, and a magnetic field generated by the current is detected by the Hall element and output as a Hall voltage. To do. At this time, since the relationship between the Hall voltage and the current value is known, it can be converted into a corresponding current value by measuring the Hall voltage and the current value flowing through the circuit can be known.

Such a current sensor is delivered to each manufacturer as a single component. In an automobile, for example, the current flowing through a harness connected to the battery by being attached to the plus or minus pole of the battery is measured. I was measuring .
JP 2001-66328 A

  However, the above-described conventional current sensor is delivered as a single component, and has a drawback that it is difficult to reduce the size and space by cooperation with other components.

  Further, when replacing the battery, it is necessary to remove and attach the current sensor each time, which is a troublesome operation.

  Therefore, the problem to be solved by the present invention is to provide a current sensor that is excellent in workability at the time of mounting and can be effectively reduced in size and space.

In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that the current sensor part in which the harness is inserted, a holding part fitted to a terminal member crimped to an end part of the harness, and the current sensor. And a support part that connects the holding part and the current sensor part, the holding part, and the support part are integrally formed, and the terminal member is caulked to the end of the harness. The first portion extending from the end portion along the extending direction of the harness, and the second portion bent from the first portion in a direction perpendicular to the extending direction. has a facing portion facing the second portion, the support portion extends toward said second portion from said opposed portion, said retaining portion is an end portion of the second portion side in the support portion connection, fitted to the second portion

The invention according to claim 2 is the current sensor mounting method according to claim 1 , wherein the harness is inserted into the current sensor section, and the end of the harness is inserted after the insertion step. A fitting step of fitting the holding member onto the terminal member caulked to the portion.

According to the first and second aspects of the invention, it is possible to effectively reduce the size and space.

  Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a side view of a battery 1 portion mounted on a vehicle such as an automobile, for example. A ground circuit component 2 is connected.

  The ground circuit component 2 includes a battery connection terminal (terminal member) 3 connected to the minus pole 1 a and a ground wire (harness) 4 connected to the battery connection terminal 3. This battery connection terminal 3 is provided with an elongated flat plate-like terminal main body 3a and a terminal pole 3a which is provided at one end of the terminal main body 3a and which can be clamped and released by fastening with a bolt 6 and a nut with a minus pole 1a as a holding shape. The connection part 3b and a wiring connection part 3c that is provided at the other end of the terminal body part 3a and that is caulked and joined to the core part 4a where the ground wire 4 is exposed.

  The terminal body 3a of the battery connection terminal 3 is bent at approximately 90 degrees as shown in FIGS. 1 and 2, and the pole connection 3b is connected and fixed to the minus pole 1a. The ground wire 4 connected to the connection portion 3c is configured to extend from the side of the battery 1 downward. At this time, as in the conventional relationship between the battery and the battery connection terminal, an appropriate space (for example, about 15 mm) is ensured between the side surface of the battery 1 and the wiring connection portion 3c due to the structure. .

  In the present embodiment, a current sensor 8 as shown in FIGS. 1 to 3 is attached and held to the ground circuit component 2 having such a structure.

  That is, the current sensor 8 includes a current sensor portion 8b having an insertion hole 8a through which the ground wire 4 is inserted, and a support piece portion having a rectangular section that is appropriately extended and disposed above the upper surface of one side of the current sensor portion 8b. 8c and a so-called bifurcated upper and lower pair of holding piece portions 8d protruding from one side surface of the upper portion of the support piece portion 8c.

  The vertical spacing between both holding pieces 8d is configured to be substantially the same as the thickness of the terminal body 3a, and the protruding length of each holding piece 8d is slightly longer than the width of the terminal body 3a. In addition, on the opposing surface side at the protruding end of each holding piece 8d, a retaining protrusion 8e is formed along the width direction.

  Therefore, as shown in FIG. 3, the terminal body 3a is held and held by the both-out protrusion ridges 8e in a state where the terminal body 3a is fitted between the holding pieces 8d. Yes.

  The support piece portion 8c, the holding piece portion 8d, and the retaining protrusion 8e constitute an attachment holding portion for attaching and holding to the battery connection terminal 3.

  In the current sensor portion 8b, in order to measure the current flowing through the ground wire 4, a substantially annular magnetic core made of a magnetic material, a Hall element arranged in a slit portion of the magnetic core, and the like are built in and arranged. A connector portion 8f for outputting a Hall voltage is provided on one lower surface side of the sensor portion 8b. And the exterior part, the support piece part 8c, the holding piece part 8d, and the retaining protrusion 8e of the current sensor part 8b in the current sensor part 8b are integrally formed of a heat resistant resin or the like. Yes.

  The present embodiment is configured as described above. When the current sensor 8 is assembled to the ground circuit component 2, the ground wire 4 is inserted into the insertion hole 8a of the current sensor portion 8b of the current sensor 8, The core wire portion 4 a of the ground wire 4 is caulked and joined to the wiring connection portion 3 c of the battery connection terminal 3. Next, when the terminal main body 3a of the battery connection terminal 3 is fitted between both the holding pieces 8d, as shown in FIG. Is done.

  In this state, if the pole connection portion 3b of the battery connection terminal 3 is connected and fixed to the minus pole 1a of the battery 1, an attachment state as shown in FIG. 1 is obtained.

  Further, when the support piece 8c of the current sensor 8 is fixed to the ground wire 4 by taping or tie wrap, the fixing portion is further strengthened, and the vibration resistance and impact resistance of the current sensor 8 are improved.

  As described above, the current sensor 8 is an attachment holding portion including the support piece portion 8c, the holding piece portion 8d, and the like for attaching and fixing to the terminal main body portion 3a to the current sensor portion 8b in which the ground wire 4 is inserted. And a battery 1 that is provided at a corner formed by the battery connection terminal 3 and the ground wire 4 connected to the battery connection terminal 3. It is a structure that is mounted and arranged in a so-called dead space portion formed between the two sides, and there is an advantage that it is possible to effectively reduce the size and space by cooperation between components.

  Further, since the current sensor 8 is disposed in the dead space surrounded by the battery 1, the battery connection terminal 3, and the ground line 4, mutual interference with other parts can be effectively prevented, and due to contact with other parts, etc. Damage can be prevented.

  When replacing the battery 1, it is only necessary to remove the pole connection portion 3b of the battery connection terminal 3 from the minus pole 1a. After the exchange, the pole connection portion 3b removed from the minus pole 1a may be connected and fixed again. There is no need to attach or detach the current sensor 8 at all, and there is an advantage of excellent workability at the time of replacement.

  Further, since the connector portion 8f to which the harness of the control circuit is connected has a structure provided on the lower surface side of the current sensor portion 8b, it is possible to effectively prevent intrusion of water, dust, etc., and it is excellent in waterproofness. There are advantages.

  In addition, although the structure provided with the connector part 8f in the lower surface side of the current sensor part 8b is shown, the structure provided in the side surface of the current sensor part 8b may be sufficient. Also in this case, invasion of water, dust, etc. can be effectively prevented and waterproofness can be secured well as compared with the case where it is arranged on the upper surface side.

  In the above embodiment, the structure is shown in which the current sensor 8 is mounted and held across the ground wire 4 and the battery connection terminal 3, but between the ground wire 4 and the ground terminal as the terminal member at the other end. The same structure can also be applied to a structure that is mounted and held across.

  4 to 6 show a second embodiment, and the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  That is, in the present embodiment, the holding piece as the attachment holding portion that extends in the vertical direction along the insertion direction of the ground wire 4 to the current sensor portion 8b where the ground wire (harness) 4 is inserted. It is set as the structure where the parts 8g and 8h were provided.

  In the present embodiment, one holding piece 8h has a semicircular cross section extending along the circumferential direction of the insertion hole 8a.

  Then, the current sensor 8 through which the ground wire 4 is inserted is moved to a desired position in the length direction of the ground wire 4, that is, a desired position in the vertical direction, and the holding pieces 8g and 8h are moved to the ground wire 4 and the wiring connection portion 3c. If it is fixed with tape or tie wrap with an adhesive tape, it can be attached and held at a desired position avoiding interference with other parts.

  The present embodiment is configured as described above. Like the first embodiment, the present embodiment can be provided with a simple structure, and can be effectively reduced in size and space by cooperation between components. Mutual interference with other parts can also be effectively prevented, and damage due to contact with other parts can be prevented. And there exists an advantage which is excellent in workability | operativity also at the time of replacement | exchange of the battery 1. FIG.

  Further, in the present embodiment, the current sensor portion 8b has a simple structure in which holding pieces 8g and 8h are provided, which can be easily manufactured and can be adjusted and fixedly held at a desired position in the length direction of the ground wire 4. There are advantages.

  Also in this embodiment, a structure is provided in which each of the holding piece portions 8g and 8h is provided with an attachment holding portion that is held in the ground wire 4 as a fitting shape like the holding piece portion 8d of the first embodiment. It is good. At this time, if the structure is such that the ground wire 4 is press-fitted, it can be fixed and held easily.

  In the above embodiment, the current sensor 8 is attached and held in the vicinity of the ground circuit component 2 from the minus pole 1a of the battery 1. However, as indicated by the phantom line in FIG. In addition, the ground circuit component 2 may be attached and held in the middle of the ground wire 4, and is not limited to the ground wire 4, and may be other harnesses, such as any harness in the automobile along the harness. Can also be installed at the site.

  7 to 12 show a third embodiment, and the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  That is, in this embodiment, the current sensor 8 is not limited to being attached to and held by the ground circuit component 2 from the negative pole 1a of the battery 1, but at the end of the harness 11 as shown in FIGS. If it exists, it is set as the structure which may be installed in any site | part in a motor vehicle, The harness 11 is beforehand penetrated to the penetration hole 8a of the current sensor 8, and predetermined terminals, such as a ground terminal, are set in the edge part of the harness 11 after that. It is installed by caulking the member 13.

  Specifically, the current sensor 8 includes a current sensor portion 8b having an insertion hole 8a through which the harness 11 is inserted, and a support having a rectangular cross section that is appropriately extended and disposed below the lower surface on one side of the current sensor portion 8b. The structure includes a piece 8c and a so-called bifurcated pair of left and right holding pieces 8d protruding from one side surface of the lower end of the support piece 8c.

  The current sensor 8 measures the current of the harness 11 and is fixed to the terminal member 13 by caulking a predetermined terminal member 13 such as a ground terminal with the holding piece 8d. To support.

  According to such a configuration, there is an advantage that the current sensor 8 can be installed anywhere along the harness 11. Therefore, for example, the current sensor 8 is not limited to being installed in the harness 11 near the ground terminal of the battery 1 but can be easily installed anywhere, and the versatile current sensor 8 can be provided.

  Further, since the harness 11 can be freely rotated in the in-plane direction of the current sensor 8 with respect to the central axis, the degree of freedom of installation is large, and the degree of freedom of the orientation of the terminal member 13 is widened.

  Furthermore, the current sensor 8 and the harness 11 can be simultaneously and easily fixed in the automobile by fixing the support piece 8c and the like directly to the harness 11 or the chassis of the automobile with taping and tie wraps.

  Furthermore, this embodiment is also the same as the first embodiment and the second embodiment in that the size and space saving can be effectively achieved.

It is a principal part side view which concerns on the 1st Embodiment of this invention. It is the principal part perspective view. It is a front view of the current sensor. It is a principal part side view which concerns on 2nd Embodiment. It is a front view of the current sensor. It is the same top view. It is a principal part perspective view which concerns on 3rd Embodiment. It is the same perspective view. It is a top view of the same current sensor. It is a side view of the same current sensor. It is another side view of the same current sensor. It is a bottom view of the same current sensor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Battery 1a Minus pole 2 Ground circuit component 3 Battery connection terminal 3a Terminal main-body part 3b Pole connection part 3c Wiring connection part 4 Ground wire (harness)
8 current sensor 8a insertion hole 8b current sensor portion 8c support piece portion 8d holding piece portion 8e retaining protrusion 8f connector portion 8g, 8h holding piece portion 11 harness 13 terminal member

Claims (2)

A current sensor for measuring the current flowing in the harness,
A current sensor portion in which the harness is inserted; and
A holding portion that fits into a terminal member that is crimped to an end of the harness;
A support unit that connects the current sensor unit and the holding unit;
The current sensor unit, the holding unit, and the support unit are integrally formed,
The terminal member is in a state of being crimped to the end portion of the harness, and a first portion extending from the end portion along the extending direction of the harness, and a direction perpendicular to the extending direction from the first portion And a second portion bent to
The current sensor unit has a facing portion facing the second portion,
The support portion extends from the facing portion toward the second portion,
The holding portion is a current sensor that is connected to an end portion of the support portion on the second portion side and is fitted to the second portion. A method for attaching a current sensor according to claim 1,
An insertion step of inserting the harness into the current sensor unit;
A current sensor mounting method comprising: a fitting step of fitting the holding portion to the terminal member crimped to the end portion of the harness after the insertion step.

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