JP6051877B2 - Wheel speed sensor - Google Patents

Description

  The present invention relates to a vehicle wheel speed sensor.

  In recent years, an anti-lock brake system (ABS) has been mounted on a vehicle in order to improve driving safety. If the deceleration of the wheel falls below a set value, in other words, if the wheel is locked by a sudden brake, the brake on the wheel is released, the wheel is unlocked, and the driver steers it. And a configuration for detecting the speed of the wheel.

  The configuration for detecting the speed of the wheel includes an annular sensor rotor coaxially attached to the wheel hub and a wheel speed sensor facing the sensor rotor. A magnet is provided on one of the wheel speed sensor or the sensor rotor, and a magnetic body is provided on the other. The wheel speed sensor detects the amount of magnetic flux change due to the rotation of the sensor rotor, converts it into an electrical signal, and outputs it to the ABS control device.

  The wheel speed sensor includes, for example, a detection unit including a Hall IC (magnetoelectric transducer), a rectangular parallelepiped holder on which the detection unit is mounted, and a cover that covers the detection unit mounted on the holder (for example, a patent) Reference 1). A detection unit is placed on one surface of the holder. The cover has a U-shaped cross-section facing the one surface of the holder and the other two surfaces connected to the two opposing sides of the surface. A detection unit is placed on the one surface of the holder, a cover is mounted thereon, and the detection unit is held between one surface of the cover and the holder.

JP 2008-268016 A

  However, holding force between the cover and the holder may result in insufficient holding force.

  This invention is made | formed in view of such a situation, and it aims at providing the wheel speed sensor which can make a holder hold | maintain the detection part containing a magnetoelectric transducer reliably.

Wheel speed sensor according to the present invention is located between the hub magnet and a wheel, a magnetoelectric conversion element for converting an electric signal to detect a magnetic flux change amount due to the rotation of the wheel hub and bent A lead having one end connected to the magnetoelectric transducer and a rectangular parallelepiped holding portion for holding the magnetoelectric transducer are provided on one side, and the other end of the lead is provided on the one side. A wheel speed sensor comprising: a holder placed on another continuous surface; and a cover that covers the holder from the other surface side. The cover is a cantilever projecting toward the lead at a portion facing the other surface. It has a beam shape and has a pressing portion for pressing the lead.

In the present invention, the lead and the magnetoelectric transducer are securely held by the holder by the pressing portion provided on the cover.
Further, the pressing portion is brought into contact with the lead, and the pressing force of the pressing portion is reliably applied to the lead.

  In the wheel speed sensor according to the present invention, the cover covers from one end portion of the lead to a midway portion, an electronic component protruding toward the cover side is provided in the midway portion of the lead, and the pressing portion is The lead is pressed between the magnetoelectric transducer and the electronic component, and the cover has a concave portion or a hole in which the electronic component is disposed inside the portion facing the electronic component.

  In the present invention, a concave portion or a hole is formed in a portion of the cover facing the electronic component to secure an arrangement space for the electronic component, and the electronic component is arranged on the inner side, thereby reducing the size of the wheel speed sensor. Realize.

  The wheel speed sensor according to the present invention is characterized in that the cover includes a protrusion adjacent to the lead in a direction intersecting the longitudinal direction of the lead.

  In the present invention, the cover includes a protrusion adjacent to the lead in a direction crossing the longitudinal direction of the lead. An electric wire is placed on the lead and soldered. However, when the electric wire is placed, the electric wire is positioned by the protrusion, and reliable soldering of the electric wire and the lead piece is realized.

  The wheel speed sensor according to the present invention includes two leads, protrudes from between both leads, and a partition plate along the leads is provided on the other surface of the holder, and the end of the partition plate on the other surface. A concave portion is formed at a location continuous with the portion, and a fitting portion that fits into the concave portion is provided on the cover.

  In the present invention, a recess is formed on the other surface of the holder in the vicinity of the end of the partition plate, and a fitting portion provided on the cover is fitted into the recess. Thereby, it is prevented that a gap is generated near the end of the partition plate, and the two electric wires separated by the partition plate are prevented from being short-circuited.

  The wheel speed sensor according to the present invention is characterized in that a fitting groove into which the partition plate is fitted is provided in the fitting portion.

  In this invention, a partition plate is inserted in the insertion groove of a fitting part, and a partition plate and a side-plate part are connected reliably.

  The wheel speed sensor according to the present invention includes a metal protective cover that covers the holding portion and has an opening at a portion facing the holding portion.

  In the present invention, a metal protective cover is provided at the end of the holder to protect the magnetoelectric transducer. The holder is molded with resin after the protective cover is attached, but it is confirmed from the opening formed in the protective cover after molding whether the molding is insufficient due to the generation of bubbles or the like.

  In the present invention, the lead can be pressed by the pressing portion provided on the cover, and the lead and the magnetoelectric transducer can be securely held by the holder.

It is a disassembled perspective view which shows a wheel speed sensor schematically. It is a disassembled perspective view which shows a wheel speed sensor schematically. It is a top view which shows a wheel speed sensor schematically. It is sectional drawing which made the IV-IV line shown in FIG. 3 the cutting line. It is sectional drawing which shows schematically the wheel speed sensor molded by the resin member.

  Hereinafter, the present invention will be described in detail with reference to the drawings showing a wheel speed sensor according to an embodiment. 1 and 2 are exploded perspective views schematically showing the wheel speed sensor, FIG. 3 is a plan view schematically showing the wheel speed sensor, and FIG. 4 is a sectional view taken along line IV-IV shown in FIG. .

  The wheel speed sensor includes a detection unit 10 that detects a magnetic flux change amount due to rotation of a rotor attached to a wheel hub, a holder 1 that holds the detection unit 10, and a cover that covers the detection unit 10 held by the holder 1. 20.

  The holder 1 has a rectangular parallelepiped shape and includes a holding recess 2 (holding portion) on one end surface (one surface) thereof. An accommodation chamber 8 for accommodating a magnet 30 to be described later is provided inside one end of the holder 1 (the end on the one end face side), and the bottom surface of the holding recess 2 is open and communicates with the accommodation chamber 8. . A notch 3 opened on one side 4 (other surface) side of the holder 1 is provided at one edge of the holding recess 2, and the holding recess 2 has a U shape when viewed from one end surface. The one side surface 4 is inclined downward toward the other end of the holder 1.

  A recess 6 is formed at the center of the side surface 4, and a partition plate 5 extends from the recess 6 to the other side of the side surface 4. At the end of the partition plate 5 on the concave portion 6 side, an insertion protrusion 5a that is inserted into an insertion groove 26a described later is provided. The fitting protrusion 5 a is located inside the recess 6 and continues to the bottom surface of the recess 6. The fitting protrusion 5 a extends in a direction intersecting the one side surface 4. Engagement protrusions 7 and 7 that engage with engagement holes 27a and 27a, which will be described later, are provided on both side surfaces of the holder 1 that intersect one side surface 4, respectively.

  The detection unit 10 has two leads 12 and 12 having a strip shape, and both the leads 12 and 12 are substantially parallel to each other. One end of the lead 12 is bent, and the tip of the one end is connected to the magnetoelectric transducer 11 (for example, Hall IC). The magnetoelectric transducer 11 detects the amount of magnetic flux change due to the rotation of the rotor attached to the wheel hub, converts it into an electrical signal, and outputs it. The rotor is made of a conductive member.

  An electronic component 13 including a capacitor is provided on the other end portion of the lead 12 over both the leads 12 and 12. The electronic component 13 protrudes from the lead 12 and the protruding direction is opposite to the direction in which one end of the lead 12 is bent. The detection unit 10 includes the magnetoelectric transducer 11 inserted into the holding recess 2 from the notch 3, and the partition plate 5 is inserted between the leads 12 on the other end side of the electronic component 13. To the holder 1.

  The cover 20 includes a rectangular plate-shaped body 21, and an opening 22 is provided at one end of the body 21. A pressing portion 23 that has a tongue shape and presses the lead 12 protrudes from the inner edge portion of the opening 22 toward the one surface 21 a side of the body 21. The pressing part 23 has a cantilever shape. As shown in FIG. 4, at the other end of the body 21, a recess 24a is formed on one surface 21a of the body 21, and a through hole 24 is provided at the bottom of the recess 24a.

  The position of the pressing portion 23 described above corresponds to between the electronic component 13 and the magnetoelectric transducer 11, and the positions of the recess 24 a and the hole 24 correspond to the electronic component 13.

  Engagement pieces 27, 27 protrude from the both edges of the body 21 parallel to the longitudinal direction to the one surface 21 a side. The engaging piece 27 is provided with an engaging hole 27a penetrating therethrough. A rectangular end plate 21c protrudes from the other end of the body 21 toward the one surface 21a. At the protruding end of the end face plate 21c, protrusions 25 are provided at two corners of the end face plate 21c. The protrusion 25 protrudes outward from the end face plate 21c. Each of the protrusions 25, 25 is arranged so as to be adjacent to an edge (hereinafter referred to as an outer edge) located on the opposite side of the other lead 12 among the two longitudinal edges of one lead 12.

  A fitting portion 26 that fits into the concave portion 6 is provided between the protrusions 25 of the end face plate 21c. The fitting portion 26 has a rectangular parallelepiped shape that is long in a direction perpendicular to the body 21, and protrudes toward the one surface 21a from the end face plate 21c. A fitting groove 26a that extends in a direction perpendicular to the body 21 and into which the fitting protrusion 5a is fitted is provided on a side surface of the fitting portion 26 that is parallel to the end face plate 21c. The insertion groove 26a is closed on the other surface 21b side of the body 21, and the insertion groove 26a is opened on the one surface 21a side of the body 21.

  The cover 20 is disposed so as to sandwich the lead 12 and the electronic component 13 between the holder 1, the engagement protrusion 7 is engaged with the engagement hole 27 a, and the insertion protrusion 5 a is inserted into the insertion groove 26 a. And attached to the holder 1. The engagement pieces 27 and 27 are elastically deformed and get over the engagement protrusions 7 and 7, and the engagement protrusions 7 and 7 engage with the engagement holes 27a and 27a. The pressing part 23 abuts against the lead 12 between the electronic component 13 and the magnetoelectric transducer 11 and elastically deforms, and presses the lead 12 with an elastic restoring force.

  The insertion protrusion 5a is inserted into the insertion groove 26a from the opening side, and is inserted to the closed portion of the insertion groove 26a. Each protrusion 25 is adjacent to the outer edge of the lead 12. At this time, the fitting portion 26 is fitted into the recess 6. With the configuration described above, the detection unit 10 is reliably held between the cover 20 and the holder 1.

  FIG. 5 is a cross-sectional view schematically showing the wheel speed sensor molded by the resin member 60. A magnet 30 is accommodated in the accommodation chamber 8 and faces the magnetoelectric transducer 11. The magnetoelectric transducer 11 is provided with a protective cover 40 formed by bending a belt-shaped metal sheet into a U-shape. The inner surface of the central portion of the protective cover 40 faces the magnetoelectric transducer 11. The central portion is provided with an opening 41 for confirming whether the resin member 60 has been sufficiently molded. Examples of the material for the metal sheet include iron and aluminum sheets, but are not particularly limited as long as the material has sufficient hardness to protect the magnetoelectric transducer 11.

  Each of the positive and negative tip portions 51 a of the electric wire 51 is placed on the lead 12 and soldered on both sides of the partition plate 5. When the tip 51a of the electric wire 51 is placed on the lead 12, the tip 51a is positioned by the protrusions 25 and 25 adjacent to the outer edge of the lead 12, so that the soldering can be performed quickly and reliably. it can.

  After soldering, insert molding (molding) is performed on the holder 1, the detection unit 10, the cover 20, and the electric wires 51 by the resin member 60. After the insert molding, the state of the resin member 60 molded from the opening 41 of the protective cover 40 (whether bubbles are generated or the like) is confirmed, and it is confirmed whether or not sufficient insert molding has been performed. When sufficient insert molding is performed, the resin bracket 50 is attached. The resin bracket 50 is attached to the vehicle body so that the magnetoelectric transducer 11 faces the rotor attached to the wheel hub. The magnetoelectric transducer 11 is located between the rotor and the magnet 30, and the magnetoelectric transducer 11 detects the amount of magnetic flux change due to the rotation of the rotor, converts it into an electrical signal, and outputs it. The output electric signal is transmitted to the lead 12 and the electric wire 51 and is input to, for example, an ABS control device.

  In the wheel speed sensor according to the embodiment, the lead 12 is pressed by the pressing portion 23 provided on the cover 20, and the pressing force of the pressing portion 23 is reliably applied to the lead 12, and the lead 12 and the magnetoelectric transducer. 11 can be securely held by the holder 1. In addition, a concave portion 24a and a hole 24 are formed in a portion of the cover 20 facing the electronic component 13 to secure a space for arranging the electronic component 13, and the electronic component 13 is arranged on the inside thereof, thereby realizing a reduction in the wheel speed sensor. To do.

  The cover 20 includes a protrusion 25 adjacent to the lead 12 in a direction intersecting the longitudinal direction of the lead 12. The electric wire 51 is placed on the lead 12 and soldering is performed. However, when the electric wire 51 is placed, the electric wire 51 is positioned by the protrusions 25, so that the electric wire 51 and the lead 12 are reliably soldered. Can be realized.

  In addition, a recess 6 is formed on the side surface of the holder 1 near the end of the partition plate 5, and a fitting portion 26 provided on the cover 20 is fitted into the recess 6. Thereby, it is possible to prevent a gap from being generated in the vicinity of the end portion of the partition plate 5, and to avoid a short circuit between the two front end portions 51 a separated by the partition plate 5.

  Further, a metal protective cover 40 is provided at the end of the holder 1 to protect the magnetoelectric transducer 11. The holder 1 is molded with resin after the protective cover 40 is attached, but it can be confirmed from the opening 41 formed in the protective cover 40 after molding whether the molding is insufficient due to the generation of bubbles or the like.

  In addition, although the wheel speed sensor which concerns on embodiment is provided with the magnet 30, it replaces with the magnet 30 and a conductive member may be provided in a wheel speed sensor, and the magnet 30 may be provided in a hub. Moreover, in order to ensure the arrangement space of the electronic component 13, although the recessed part 24a and the hole 24 are provided in the cover 20, only the recessed part 24a may be sufficient. Alternatively, only the hole 24 may be provided in the cover 20 so that the electronic component 13 protrudes from the hole 24. The wheel speed sensor can be applied to both driving wheels and driven wheels.

  It should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The technical features described in each embodiment can be combined with each other, and the scope of the present invention is intended to include all modifications within the scope of claims and the scope equivalent to the scope of claims. Is done.

1 Holder 2 Holding recess (Holding part)
DESCRIPTION OF SYMBOLS 5 Partition plate 6 Recessed part 11 Magnetoelectric transducer 12 Lead 13 Electronic component 20 Cover 24 Hole 23 Press part 24a Recessed part 25 Projection part 26 Fitting part 26a Insertion groove 40 Protective cover 41 Opening

Claims (6)

Is located between the magnet and the wheel hub, a magnetoelectric conversion element for converting the detected electrical signal flux variation due to the rotation of the wheel hub, without a bent strip, said one end portion magnetoelectric A lead connected to the transducer, a holder having a rectangular parallelepiped shape, having a holding portion for holding the magnetoelectric transducer on one surface, and placing the other end of the lead on the other surface connected to the one surface; In the wheel speed sensor comprising a cover that covers the holder from the other surface side,
The wheel speed sensor according to claim 1, wherein the cover has a cantilever shape projecting toward the lead at a portion facing the other surface, and has a pressing portion that presses the lead. The cover covers from one end of the lead to the middle part,
An electronic component protruding toward the cover is provided in the middle of the lead,
The pressing portion presses between the magnetoelectric transducers and the electronic component in the lead,
2. The wheel speed sensor according to claim 1, wherein the cover has a concave portion or a hole in which the electronic component is disposed on an inside thereof at a portion facing the electronic component. The cover, a wheel speed sensor according to claim 1 or 2, characterized in that it comprises a projection adjacent to the lead at a direction crossing the longitudinal direction of the lead. Two leads,
Projecting from between both leads, a partition plate along the lead is provided on the other surface of the holder,
A concave portion is formed at a location connected to the end of the partition plate on the other surface,
The wheel speed sensor according to any one of claims 1 to 3 , wherein the cover is provided with a fitting portion that fits into the recess. The wheel speed sensor according to claim 4 , wherein a fitting groove into which the partition plate is fitted is provided in the fitting portion. The wheel speed sensor according to any one of claims 1 to 5 , further comprising a metal protective cover that covers the holding portion and has an opening at a portion facing the holding portion.

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