JP2005227095A - Magnetic variable sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the positional accuracy of a magnetoelectric transducer 1, when covering a resin mold. <P>SOLUTION: In the rotation detection sensor, the magnetoelectric transducer 1 is held by a holder 2, the periphery is subjected to resin mold covering 5, and the rotation of a body B to be detected is detected by the magnetoelectric transducer 1, and the detection signal is transmitted to the outside by a cable 4. An engagement hole 7 is provided at a lead terminal 3, and a nib 10 and an arch section 11 are provided at the holder 2. The lead terminal 3 is inserted into a slot 12 of the arch section 11 from the oblique upper part, the lead terminal 3 is locked to an engagement projection 9; and the nib 10 and is slid on the surface of the holder 2, the thickness direction and the width direction of the lead terminal 3 are positioned, and the magnetoelectric transducer 1 is positioned and fixed at a prescribed position in the fitting recess 8. In this manner, by positioning, locking, and fixing the lead terminal 3 to the holder 2 at least at two locations, the positional accuracy of the magnetoelectric transducer 1, after the resin mold covering 5 can be improved. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a magnetic variable sensor used as a rotation detection sensor such as a wheel speed sensor of an automobile and an engine speed sensor.

For example, a wheel speed sensor will be described with reference to FIG. 1 showing an embodiment of the present invention. A magneto-electric conversion element 1 such as a Hall IC or a magnetoresistive element (MR element) is held by a holder 2 and the periphery thereof is The magnetic variable due to the rotating body B interlocked with the wheel is detected by the magnetoelectric conversion element 1, and the rotational speed of the rotating body (wheel) B is measured based on the detection signal.
The magnetoelectric conversion element 1 is generally formed by integrally forming a plate-like lead terminal 3, positioned and fixed to the holder 2, and connected to the cable 4 to the outside via the lead terminal 3 to control the detection signal. (See Patent Document 1 FIG. 1).
JP 2003-307522 A

Conventionally, the magnetoelectric conversion element 1 is positioned and fixed to the holder 2 by forming a fitting recess 8 in the holder 2 and fitting the magnetoelectric conversion element 1 into the fitting recess 8.
At this time, in consideration of the dimensional variation of the magnetoelectric conversion element 1, the fitting recess 8 is formed slightly larger than the magnetoelectric conversion element 1 so that the situation in which the magnetoelectric conversion element 1 cannot be fitted into the fitting recess 8 does not occur. Yes. For this reason, a gap is generated between the fitting recess 8 and the magnetoelectric conversion element 1, and the magnetoelectric conversion element 1 becomes loose. If rattling is performed, when the resin mold coating 5 is performed, the magnetoelectric conversion element 1 is not fixed at a required position due to the molding pressure, which hinders measurement accuracy.

  In order to solve this problem, the inventor of the present invention engages the lead terminal 3 of the magnetoelectric conversion element 1 with the holder 2 of the magnetoelectric conversion element 1 and positions the magnetoelectric conversion element 1 with respect to the holder 2. (See Patent Document 1 FIG. 1).

However, in the proposed technique, the straight plate piece-like lead terminal 3 (see FIG. 3 of Patent Document 1) and the holder 2 are locked at one place or the entire length of the groove (Patent Document 1 FIG. 1, FIG. 8 ( a), the locking state is unstable, and in particular, the thickness direction of the lead terminal 3 is unstable. For this reason, the lead terminal 3 may be moved or deformed due to the molding pressure of the resin mold coating 5, and in the worst case, the locking may be released, and the position accuracy of the magnetoelectric transducer 1 is not stable.
This invention makes it a subject to raise the positional accuracy of the magnetoelectric conversion element 1 at the time of the resin mold coating.

In order to achieve the above object, the present invention has at least two places where the above-mentioned straight plate piece-like lead terminal is locked to the holder of the magnetoelectric conversion element, and the thickness direction and width direction of the lead terminal respectively. Positioning was performed at at least two locations.

In general, when a linear plate piece is placed along the surface of a member to be attached, it is easy to move in the thickness direction and the width direction at one location (locking). Then, the movement is fixed and stable.
Since the resin mold coating is performed in this stable fixed state, the magnetoelectric conversion element 1 integrated with the lead terminal is also difficult to move, and the positional accuracy after the resin mold coating is high.

  In this invention, the lead terminal integrated with the magnetoelectric conversion element is positioned and locked in the thickness direction and the width direction in the holder at two or more locations, so that the magnetoelectric conversion element is positioned and fixed to the holder. It is possible to obtain a highly accurate position of the magnetoelectric conversion element after resin mold coating.

BEST MODE FOR CARRYING OUT THE INVENTION

  As an embodiment of the present invention, in a magnetic variable sensor that holds a magnetoelectric conversion element by a holder, covers the periphery thereof with a resin mold, detects a magnetic variable by the magnetoelectric conversion element, and transmits the detection signal to the outside by a cable. In addition, the magnetoelectric transducer is integrally provided with a lead terminal for connecting a linear plate piece to the cable, and the lead terminal extends along the surface of the holder and at least two of the holder surface spaced in the length direction of the lead terminal. It is possible to employ a configuration in which the lead terminal is engaged with the holder, the thickness direction and the width direction of the lead terminal are positioned at at least two locations, and resin mold coating is performed.

As a means for locking the lead terminal to the holder, an arch portion that forms a slot through which the lead terminal penetrates is provided on the surface of the holder along the lead terminal, and the longitudinal width of the slot is positioned in the thickness direction of the lead terminal. The horizontal width is a dimension in which the width direction of the lead terminal is positioned.
A claw for positioning the lead terminal in the width direction is provided on the surface of the holder along the lead terminal, and the tip of the claw is projected inwardly in the lead terminal width direction so that the lead terminal is positioned in the thickness direction. Or
An engagement hole may be formed in the lead terminal, an engagement protrusion that fits into the engagement hole may be formed in the holder, and a retaining mechanism may be provided on the engagement protrusion.

  The arch portion is provided on a holder end surface continuous with the holder surface along the lead terminal, and the inner surface of the slot opposite to the holder surface is inclined downward so that the lead terminal is positioned in the thickness direction at the end of the inclined surface. Can be. In this way, the lead terminal can be inserted into the slot from obliquely above, and the workability is good.

  As another embodiment for ensuring the workability of the slot, the magnetoelectric conversion element is held by a holder, the periphery thereof is covered with a resin mold, the magnetic variable is detected by the magnetoelectric conversion element, and the detection signal is externally connected by a cable. In the magnetic variable sensor for transmitting to the magneto-electric transducer, a lead plate for connecting the linear plate piece to the cable is integrally provided on the magnetoelectric conversion element, and a dovetail groove is formed on the surface of the holder to fit the lead terminal over the entire length. A configuration in which an arch portion for forming the slot is provided on the end face of the holder where the groove opens can be adopted.

  In this configuration, the lead terminal is securely positioned in the thickness direction and width direction by fitting the lead terminal into the dovetail groove, so that the positioning of the magnetoelectric conversion element to the holder is also reliable. Therefore, the positional accuracy of the magnetoelectric transducer is high. When the lead terminal is fitted into the dovetail groove, the lead terminal can be smoothly introduced into the dovetail groove by inserting the lead terminal into the slot of the arch portion from obliquely above, and the workability is good.

  An embodiment is shown in FIGS. 1 to 5, and this embodiment relates to a wheel speed sensor P. As shown in FIGS. 1 and 2, a magnetoelectric conversion element 1 such as a Hall IC is provided in the holder 2, and the magnetoelectric conversion element is provided. After connecting the cable 4 to one lead terminal 3, they are coated with a resin mold 5. In the figure, reference numeral 6 denotes a flange integrally formed with the cover 5, and the wheel speed sensor P of the embodiment is attached to a fixed object such as a vehicle body by the flange 6.

  As shown in FIG. 3, the magnetoelectric conversion element 1 is formed by integrally molding a linear plate piece lead terminal 3 at the time of resin molding, and an engagement hole 7 is formed in the lead terminal 3. ing. The holder 2 is formed with a fitting recess 8 of the magnetoelectric conversion element 1, and this fitting recess 8 is formed slightly larger than the magnetoelectric conversion element 1 in consideration of dimensional variation during molding of the magnetoelectric conversion element 1. Thus, a situation in which the magnetoelectric conversion element 1 cannot be fitted does not occur.

  On the surface of the holder 2, there are provided an engagement projection 9 that fits into the engagement hole 7 of the lead terminal 3 and a claw 10 that is engaged with the side edge of the lead terminal 3, as shown in FIG. The tip 10a protrudes inward in the width direction of the lead terminal 3 and can be locked to the upper surface of the side edge. For this reason, as shown in the chain line in FIG. 5, the lead terminal 3 is positioned and fixed at two locations in the length direction by locking the engaging hole 7 to the engaging protrusion 9 and the claw 10. By this fixing, the magnetoelectric conversion element 1 is fitted in the fitting recess 8 and is positioned and fixed at a predetermined position.

Further, an arch portion 11 is provided on the end surface of the holder that is continuous with the surface of the holder 2 along which the lead terminal 3 extends, and the slot 12 of the arch portion 11 has a lateral width w (see FIG. 4A) of a pair of leads. The outer width W of the terminals 3 and 3 (see FIG. 3) is set, and the inner surface 12a on the opposite side of the holder surface is inclined downward, and the gap t between the edge of the inclined surface 12a and the surface of the holder 2 (Refer to FIG. 4B) is set to the approximate thickness T of the lead terminal 3 (see FIG. 3).
For this reason, as shown by the solid line in FIG. 5, the lead terminal 3 is inserted into the slot 12 obliquely from above and the surface of the holder 2 is held while the lead terminal 3 is locked to the engaging protrusion 9 and the claw 10 as shown by the chain line in FIG. The lead terminals 3 are positioned in the thickness direction and the width direction, respectively, and the magnetoelectric conversion element 1 is positioned and fixed at a predetermined position in the fitting recess 8.

  A conductor 4a of a cable 4 is soldered to the lead terminal 3. This connection may be before or after attachment of the magnetoelectric conversion element 1 to the holder 2. Then, the wheel speed sensor P is obtained by putting the holder 2 with the magnetoelectric conversion element 1 in a molding die (not shown) and applying the resin mold coating 5. In this embodiment, the claw 10 and the arch portion 11 position the lead terminal 3 in the thickness direction and the width direction at two locations, respectively.

  As shown in FIG. 1, the wheel speed sensor P of this embodiment is mounted opposite to a magnet pulsar ring B interlocked with a wheel shaft, and the magnet pulsar ring B has an S pole and an N pole around its periphery. It is magnetized so as to continue alternately in the direction. For this reason, the magnetism to the magnetoelectric conversion element 1 is changed by the rotation of the magnet pulser ring B, the magnetic change is detected by the magnetoelectric conversion element 1, and the detection signal is externally controlled through the lead terminal 3 and the cable 4. The rotation number of the magnet pulsar ring B, that is, the rotation number of the wheel shaft is detected (measured) by the controller.

  The engagement protrusions 9 and the engagement holes 7 are not limited to a plan view and a circular shape, but may be any shape such as a square shape or an oval shape. Further, as shown in FIG. The lead terminal 3 can be fitted by force exceeding 9a and can have a retaining function. The engaging protrusion 9 can be on the lead terminal 3 side, and the engaging hole 7 can be on the holder 2 side. If the engagement protrusion 9 has a retaining function, positioning in the thickness direction can also be performed by locking the engagement protrusion 9 and the engagement hole 7.

  Further, as shown in FIG. 7 (a), an arch portion 11 is provided on the surface of the holder 2 in which dovetail grooves 13 into which the lead terminals 3 are fitted over the entire length are formed, or as shown in FIG. 7 (b). Further, the arch portion 11 may be provided on the one provided with only the claw 10. The nail | claw 10 can be set as the structure which each side edge of each lead terminal 3 fits like the figure.

  In each aspect of the locking and fixing of the lead terminal 3 by the engaging protrusion 9, the engaging hole 7 and the arch portion 11, two locking means are selected from the engaging protrusion 9, the engaging hole 7 and the arch portion 11. The lead terminal 3 is positioned in the thickness direction and the width direction at two locations separated in the length direction and locked to the holder 2 by appropriately selecting the above, and the effect of the present invention is exhibited. it can.

  Further, the positioning of the lead terminal 3 in at least two locations in the thickness direction and the width direction does not necessarily need to be performed in the thickness direction and the width direction at the same location. That is, positioning may be performed at three or more locations. For example, in the embodiment shown in FIG. 2, the claw 10 performs positioning in the thickness direction and the width direction, but the engagement projection 9 and the engagement hole 7 only perform positioning in the width direction, and the slot 12 performs the thickness direction. Can be positioned. In this way, the width w of the slot 12 may be wider than the width W of the lead terminal 3.

In this embodiment, as shown in FIG. In this case, the pulsar ring B may be a spur gear (see FIG. 9 of Patent Document 1).
In the present invention, it is needless to say that an adhesive may be interposed between the magnetoelectric conversion element 1 and the fitting recess 8.

Cutting front view of one embodiment Cutting plan view of the embodiment Exploded perspective view of the same embodiment The holder of the Example is shown, (a) is a right side view, (b) is a cut front view. Assembly action diagram of the embodiment It is another example figure of the engagement protrusion in the Example, (a) is a top view, (b) is a front view (A), (b) is a principal part perspective view of each other Example. Cutting front view of another embodiment

Explanation of symbols

1 Magnetoelectric transducer (Hall IC)
2 Holder 3 Lead terminal 4 Cable 5 Resin mold coating 6 Mounting flange 7 Engagement hole 8 Magnetoelectric transducer fitting recess 9 Engagement protrusion 9a Engagement protrusion retaining 10 Fitting claw 10a Engagement protrusion retaining 11 Arch Portion 12 Slot 12a Inclined surface 13 of slot 13 Dovetail groove B Pulsar ring P Wheel speed sensor (magnetic variable sensor)

Claims (6)

In the magnetic variable sensor P that holds the magnetoelectric conversion element 1 by the holder 2, covers the periphery thereof with a resin mold 5, detects the magnetic variable by the magnetoelectric conversion element 1, and transmits the detection signal to the outside through the cable 4,
The magnetoelectric conversion element 1 is integrally provided with a linear plate-like lead terminal 3 for connection to the cable 4, and the lead terminal 3 extends along the surface of the holder 2 and the length of the lead terminal 3 on the surface of the holder 2. The magnetic material is characterized in that it is engaged with the holder 2 at at least two places spaced apart in the vertical direction, and the resin mold coating 5 is formed by positioning the lead terminal 3 in at least two places in the thickness direction and the width direction. Variable sensor.   An arch portion 11 that forms a slot 12 through which the lead terminal 3 passes is provided on the surface of the holder 2 along which the lead terminal 3 extends, and the vertical width t of the slot 12 is a dimension T in which the thickness direction of the lead terminal 3 is positioned. In addition, the lateral width w is a dimension W in which the width direction of the lead terminal 3 is positioned, and the slot 12 serves as one locking means for the holder 2 of the lead terminal 3. Magnetic variable sensor.   The arch portion 11 is provided on the end surface of the holder 2 continuous with the surface of the holder 2 along which the lead terminal 3 extends, and the inner surface of the slot 12 opposite to the surface of the holder 2 is inclined downward so that the end of the lead terminal 3 is formed at the edge of the inclined surface 12a. 3. The magnetic variable sensor according to claim 2, wherein positioning in the thickness direction is performed.   A claw 10 for positioning the lead terminal 3 in the width direction is provided on the surface of the holder 2 along the lead terminal 3, and the tip of the claw 10 is projected inward in the width direction of the lead terminal 3 to position the lead terminal 3 in the thickness direction. The magnetic variable sensor according to any one of claims 1 to 3, wherein the claw 10 forms one locking means for the lead terminal 3 to the holder 2.   An engagement hole 7 is formed in the lead terminal 3, an engagement protrusion 9 is formed in the holder 2 to be fitted in the engagement hole 7, and a retaining mechanism 9 a is provided on the engagement protrusion 9. The magnetic variable sensor according to any one of claims 1 to 4, wherein a means for engaging the lead terminal 3 with the holder 2 is provided. In the magnetic variable sensor P that holds the magnetoelectric conversion element 1 by the holder 2, covers the periphery thereof with a resin mold 5, detects the magnetic variable by the magnetoelectric conversion element 1, and transmits the detection signal to the outside through the cable 4,
The magnetoelectric transducer 1 is integrally provided with a lead plate 3 for connecting to the cable 4 with a straight plate piece, and a dovetail groove 13 is formed on the surface of the holder 2 to fit the lead terminal 3 over its entire length. An arch portion 11 that forms a slot 12 through which the lead terminal 3 penetrates is provided on the end face of the holder 2 where the dovetail 13 opens, and the lateral width w of the slot 12 is a dimension W in which the width direction of the lead terminal 3 is positioned. 3. The magnetic variable sensor according to claim 2, wherein the inner surface of the holder 2 opposite to the surface of the holder 2 is inclined downward so that the lead terminal 3 is positioned in the thickness direction at the edge of the inclined surface 12a.

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