JP4514703B2 - Rotation detection sensor - Google Patents

Description

  The present invention relates to a rotation detection sensor such as an automobile wheel speed sensor or an engine speed sensor.

For example, as shown in FIGS. 9 and 10, the wheel speed sensor P has a detection portion a attached (provided) to a resin holder (bobbin) 2, and the detection portion from the opening in the covered cylindrical casing 1. a holder 2 mounted with a is inserted, a pair of relay terminals 5 is connected to the lead terminal 12 from the detection part a, and the relay terminal 5 is led out from the end face of the holder base and connected to the output cable 6; The relay opening 5 and part of the output cable 6 are embedded in the casing opening and the entire circumference of the exposed portion of the holder, and the resin coating 4 is used (see Patent Document 1).
Further, there is also a case in which the detection portion a is not directly mounted on the casing 1 but the detection portion a is directly coated with the resin 4 or the output cable 6 is directly connected to the lead terminal 12 without the relay terminal 5 being interposed. Yes (see Patent Documents 2 and 3).
JP 2002-257840 A JP 2003-57259 A JP 2003-66057 A

  As shown in FIG. 10, a lead terminal 12 is led out in parallel to a rotation detecting element 11 such as a Hall IC that detects magnetic field fluctuations, and an electron such as a capacitor is provided between the lead terminals 12 and 12. Some are provided with a component 13.

  The lead terminal 12 of the detection unit a is connected to the relay terminal 5 inserted in the holder 2 by soldering or the like. At this time, the Hall IC 11 is fitted in the hole 2 c of the holder 2, and the protrusion 2 d of the holder is fitted between the lead terminals 12, 12, so that the detection part a is positioned in the holder 2. A synthetic resin lid 7 is fitted into the holder 2.

  As shown in FIG. 9, the wheel speed sensor P is provided so as to face the rotating detection object B, detects a magnetic field variation due to rotation of the detection object B by the detection unit a, and converts it into an electrical signal. The signal is transmitted to an external control device via the relay terminal 5 and the output cable 6. The detected body B has a ferromagnetic pulsar ring provided with gear-like teeth at the peripheral edge, or a magnet magnetized so that S and N poles appear alternately and continuously on the peripheral surface. Pulsar ring is used. In this example, since the magnet 3 is provided in the holder 2, a ferromagnetic pulsar ring is employed.

  In the manufacture of this type of wheel speed sensor P, in order to connect the core wire 6a of the output cable 6 to the lead terminal 12, soldering by a soldering iron or laser heating is generally employed (see FIG. 8). At that time, if the core wire 6a and the lead terminal 12 are not positioned, the relative position between the two wires 12 and 6a is not determined and heat is not transmitted well, and the solder may not be sufficiently melted and become unfamiliar.

  Further, the core wire 6a is composed of a plurality of strands (the core wire 6a is composed of a flexible wire), and the strands are easily unraveled, and one or several strands may protrude (jump out) from the bundle. is there. When the resin coating 4 is performed in a state in which the element wire protrudes, the element wire protrudes from the connecting portion to the resin coating 4 and is exposed to the outer surface, leading to deterioration of airtightness, causing cracks, There is a risk of short-circuiting between the core wires.

  This invention makes it a subject to prevent the protrusion of the strand of a core wire.

In order to achieve the above-mentioned object, the present invention firstly provides a partition wall, which is located between the connecting portions of the pair of lead terminals and the core wires of the output cable pair, and prevents the contact between the two. It was decided to provide.
By this partition wall, the pair of core wires and the lead terminals are reliably partitioned and positioned.

Next, according to the present invention, the holder is provided with walls that prevent the core wire from moving outwardly on both sides of the connecting portions.
The core wire is positioned by inserting (fitting) the tip of the core wire between the wall and the partition wall. By this positioning and the partition positioning by the partition wall, the core wire can be accurately set at the connection portion with the lead terminal.
Further, even if the core wire protrudes, further protrusion of the core wire is prevented by the movement prevention wall. For this reason, the strand of the core wire is not exposed on the outer surface of the resin coating, and the strand does not penetrate deeply into the resin coating.

According to this invention, a solder joint with high joint strength can be obtained by positioning the core wire.
In addition, since the core wire is not exposed to the outer surface of the resin coating or penetrates deep into the resin coating, there is a risk of causing deterioration of airtightness, causing cracks, or shorting between the core wires. Absent.

  As an embodiment of the present invention, a rotation detection element is attached to a holder, an output cable is drawn from the rotation detection element via a pair of lead terminals of the rotation detection element, the rotation detection element, the lead terminal, the entire holder and In the rotation detection sensor in which a part of the output cable is embedded and resin-coated, the holder is located between the connecting portions of the pair of lead terminals and the core wire of the pair of the output cable to prevent contact between the two. While providing a partition, the structure which provided the wall which prevents the movement to the outer side of the said core wire in the both sides of the said both connection parts is employable.

In this configuration, a protrusion is provided on the inner side surface of the wall, and the surface of the protrusion on the partition side is an inclined surface that approaches the partition toward the inside of the pocket portion between the wall and the partition, and the core wire is formed into a pocket. As it is inserted into the part, the core wire is brought closer to the partition wall by the inclined surface of the projection, and can be surely along the partition wall. If the core wire reliably follows the partition, positioning with the lead terminal of the rotation detecting element becomes easy.
In these configurations, if the core wire is twisted, the strands are not broken, and further, the strands are not exposed to the outer surface of the resin coating and do not penetrate deeply into the resin coating.

An embodiment is shown in FIG. 1 to FIG. 7, and the wheel speed sensor P of this embodiment is similar to the wheel speed sensor P shown in FIG. 9 and FIG. A lead piece 12 as a lead terminal is led out in parallel from the lead piece 12, and an electronic component 13 such as a capacitor is provided between the two lead pieces 12 and 12, but the lead piece 12 extends linearly from the Hall IC 11. It is. In addition, the same code | symbol as the above-mentioned shows the same thing.

  As shown in FIGS. 3 to 7, the resin molded product holder 20 has a fitting recess 14 for the Hall IC 11 formed in the front portion of one surface of the rectangular parallelepiped. Locking claws 15 that fit onto the surface of the Hall IC 11 are provided on both sides of the Hall IC fitting recess 14, and when the Hall IC 11 is fitted into the recess 14 from the front as shown in FIG. 5), the locking claw 15 is locked to the side protrusion 11a of the Hall IC 11 (see FIG. 4).

  An insertion hole 16 for the lead piece 12 is formed in the rear wall of the holder 20 (see FIGS. 1 and 5), and the lead piece 12 is inserted into the insertion hole 16 and the hole IC 11 is locked. Due to the locking by the claw 15, the detection part a is reliably positioned and set (held) on the holder 20. In the figure, reference numeral 8 denotes a locking tool that fits the holder 20 after the detection part a is set in the holder 20, and when the locking tool 8 fits in the holder 20, the detection part a is securely attached to the holder 20. Hold.

  The connecting portions 9, 9 between the lead piece 12 of the holder 20 and the pair of flexible core wires 6a of the output cable 6 are provided with a partition wall 22 positioned between them to prevent contact between the core wires 6a, 6a. A notch 23 is provided on the surface of the partition wall 22 facing the connection portions 9 and 9 so that the fillet of the soldering c connecting the lead piece 12 and the core wire 6a can be easily seen. The depth of the notch 23 (in the left-right direction in FIG. 8) is appropriately selected in consideration of the degree that the fillet of the soldering c can be easily seen. At this time, as long as the contact of the core wires 6a and 6a is prevented, both the notches 23 and 23 can be connected (the partition wall 22 is penetrated).

  Further, the holder 20 on the rear surface of the lead piece 12 of the connection portions 9 and 9 is provided with a recess 24 for preventing escape of heat when the connection portions 9 and 9 are soldered. As shown in FIG. 3, the recess 24 does not need to penetrate vertically, and as long as there is no hindrance to the support of the lead piece 12 on the surface of the holder 20 in contact with the lead piece 12, What is necessary is just to provide a hollow so that it may not contact | connect.

  Further, side walls 25 that prevent the flexible core wire 6a from moving to the outside are provided on both sides of the connecting portions 9 and 9 of the holder 20. The side wall 25 forms a pocket portion (a space surrounded by the side wall 25 and the partition wall 22) 25a, and when the cores 6a and 6a of the output cable 6 are set on the lead pieces 12 and 12, the pocket portion 25a The exposed core wires 6a and 6a at the end of the output cable 6 are inserted and positioned, and then the core wires 6a and 6a are placed along the partition wall 22 with the partition wall 22 interposed therebetween. At that time, as the core wires 6a, 6a are inserted into the pocket portions 25a, the core wires 6a, 6a are brought closer to the partition wall 22 side by the inclined surface 26a of the projection 26 on the inner side surface of the side wall 25 and are surely along the partition wall 22 (see FIG. 7), the lead terminal 12 and the core wire 6a are positioned on the same axis.

  As shown in FIG. 8A, the flexible core wire 6a is connected to the lead piece 12 by soldering c to the holder 20 with the detecting portion a by a soldering iron C. At the time of the soldering c, since the lead terminal 12 and the core wire 6a are positioned on the same axis, both the parts 12 and 6a are securely joined, and as shown in FIG. The diffusion of solder heat is prevented and smooth soldering is performed. Further, as shown in FIG. 7B, the notch 23 makes it easy to see the fillet of the soldering c, so that it is easy to judge whether the soldering is good or bad. Further, the solder c enters the notch 23, so that the bonding strength between the core wire 6a and the lead terminal 12 is also improved.

After the flexible core wire 6a is connected to the lead piece 12, the Hall IC 11, the lead piece 12, the entire holder 20, the output cable 6 and a part of the mounting bracket 10 are embedded, and the resin coating 4 is applied to the rotation detection sensor. Get P.
During the resin molding, the side wall 25 prevents the flexible core wire 6a from moving outward. At this time, it is preferable to twist the entire flexible core wire 6a so as to eliminate the unraveling.

  Moreover, as shown in FIG. 2, the positioning rib e when attaching the wheel speed sensor P is set to a position different from the parting line T of the mold. Thus, the positioning rib e is not obscured by the burr of the parting line T. Therefore, as shown in FIG. 1, the wheel speed sensor P is inserted into the hole D of the mounting member A, and the fixing bracket 10 is attached. When screwing, the wheel speed sensor P can be attached to a predetermined accurate position with the positioning rib e.

  As shown in FIG. 9, the detection part a is attached to the holder 20 even when the lead piece 12 has a U-shape. The part a can be prevented from being lifted up. Note that the notch 23, the recess 24, and the protrusion 26 can be appropriately omitted as long as there is no problem.

  In the embodiment, the casing 1 is not provided and the entire holder 20 is directly coated with the resin coating 4. However, the wheel speed sensor P in which the holder 2 shown in FIG. However, the present invention can be adopted. In addition, although the embodiment is a wheel speed sensor, it is needless to say that the present invention can be adopted in other rotation detection sensors.

Main part cutting front view of one embodiment XX sectional view of FIG. The perspective view of the principal part of the Example XX sectional view of FIG. The exploded perspective view of the principal part of the example Perspective view from below of holder of same embodiment (A) is a bottom view of the holder, (b) is a right side view of (a). Operational diagram of this embodiment Cutaway front view of the main part of the conventional example The exploded perspective view of the detection part of the conventional example

Explanation of symbols

2, 20 Holder 4 Resin coating 6 Output cable 11 Hall IC (rotation detector)
12 Lead piece (Lead terminal)
14 Hall IC fitting recess 15 Claw 22 Partition 23 Notch 24 Recess 25 Side wall 26 Protrusion 26a Inclined surface a Detection portion e Positioning rib A Mounting member T Mold parting line P Wheel speed sensor (rotation detection sensor)
B Object to be detected

Claims (2)

A rotation detection element (11) for detecting a magnetic field variation due to rotation of the detection object (B) and converting it into an electric signal, a holder (20) to which the rotation detection element (11) is attached, and the rotation detection element (11) An output cable (6) drawn out of the holder (20) via a pair of lead terminals (12) of the rotation detecting element (11), and the pair of lead terminals provided on the holder (20) (12, 12) and a partition wall (22) which is located between both connection portions (9, 9) between the pair of core wires (6a, 6a) of the output cable (6) and prevents contact between the two, Walls (25, 25) provided on both sides of the connection portions (9, 9) of the holder (20) to prevent the core wire (6a) from moving outward, the rotation detection element (11), leads The terminal (12), the entire holder (20) and the output cable Made from Bull (6) of the buried part resin-coated and (4),
Projections on the inner surface of the upper Kikabe (25, 25) and (26) is provided, the partition wall (22) side of the projection (26) surface, said wall (25, 25) between the partition wall (22) It becomes the inclined surface (26a) which approaches the partition (22) toward the inside of a pocket part (25a), and said protrusion (26) as the said core wire (6a, 6a) is inserted in a pocket part (25a). A rotation detection sensor, characterized in that the core wires (6a, 6a) are brought closer to the partition wall (22) side by the inclined surface (26a) so as to be surely along the partition wall (22).   The rotation detection sensor according to claim 1, wherein the core wire (6a) is twisted.

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