JP4514682B2 - Rotation detection sensor - Google Patents

Description

  The present invention relates to a rotation detection sensor such as a wheel speed sensor constituting an automatic travel control system such as an ABS (anti-lock brake system) in a four-wheeled vehicle or the like.

For example, as shown in FIGS. 7 and 8, a wheel speed sensor P that is one of the rotation detection sensors of this type includes a detection unit a that detects a magnetic fluctuation and converts it into an electric signal, and a wheel speed sensor P. And a magnet 3 for applying a bias magnetic field to the rotation detection element 11 such as a Hall IC, and the lead terminal 12 is connected to the rotation detection element 11. In some cases, the output cable 6 is pulled out through the cable (see Patent Document 1). In the figure, 4 is a resin coating, 5 is a relay terminal, 7 is a lid of the holder 2, and 13 is a capacitor.
JP 2003-307523 A

As shown in FIG. 7, the wheel speed sensor P is provided so as to face the rotating detection object B, and the rotation detection element 11 detects a change in the bias magnetic field due to the rotation of the detection object B, thereby generating a digital electromagnetic signal. The electromagnetic signal is transmitted to an external device such as various controllers through the output cable 6.
In the wheel speed sensor P that applies the bias magnetic field, a ferromagnetic encoder such as iron that is not magnetized by itself is used as the detection object B. On the other hand, the wheel speed sensor P that does not have the magnet 3 uses a magnet encoder magnetized so that S poles and N poles are alternately continuously arranged in the circumferential direction on the outer periphery of the body B to be detected. Magnetic field fluctuations from the S and N poles are detected by the rotation detecting element 11 (see Patent Document 1).

Today, this type of wheel speed sensor P is also required to be miniaturized, and as one means for miniaturization, the pair of conductors 6b, 6b of the output cable 6 is directly connected to the pair of lead terminals 12, 12. Thus, it is conceivable to shorten the length of the wheel speed sensor P.
At this time, in both connection portions between the pair of lead terminals 12 and 12 and the pair of conductors 6b and 6b of the output cable 6, a partition is provided between both connection portions to short-circuit the two (contact of both conductors 6b and 6b). It is done to prevent.

  However, as shown in FIG. 7, the output cable 6 is formed by covering a pair of insulated core wires 6a and 6a with a sheath 6c, and connecting the pair of lead terminals 12 and 12 to the insulated core wires 6a and 6a. This is done with the conductors 6b and 6b from which the insulation coating has been peeled off. For this reason, in the part where the output cable 6 passes through the partition wall, the output cable 6 must be a pair of insulated core wires 6a and 6a and be separated by the partition wall, and then the conductors 6b and 6b and Thus, the lead terminals 12 and 12 are connected (see the positional relationship between the reference numeral 22 and the reference numerals 6a and 6b in FIG. 1).

At this time, as shown in FIG. 9, both insulating core wires 6a and 6a are widened by the partition wall 22, and the spread gradually increases as they go forward. Therefore, the connecting portions of the conductors 6b and 6b to the lead terminals 12 and 12 are connected. In FIG. 5, the distance between the conductors 6b and 6b tends to be larger than the distance between the pair of lead terminals 12 and 12.
In this state, if the pair of lead terminals 12 and 12 and the pair of conductors 6b and 6b are to be connected by soldering, resistance welding, or the like, the contact area between the lead terminals 12 and 12 and the conductors 6b and 6b is reduced. An effective connection strength cannot be obtained. For this reason, a jig for matching the pair of lead terminals 12, 12 and the pair of conductors 6b, 6b is necessary, and the positioning operation of the conductor 6b by the jig is necessary, which is problematic in terms of cost and workability. It becomes.

  This invention makes it a subject to reduce the expansion by the partition 22 of both the insulated core wires 6a and 6a of the output cable 6. FIG.

In order to achieve the above object, the present invention inclines the upper edge of the partition wall toward the output cable in a downward slope, and gradually decreases the thickness of the partition wall toward the output cable to insulate the output cable. The core wire was led to the connecting portion through the upper edge of the descending slope.

Here, if the conductor is exposed by stripping the insulation core wire before reaching the partition wall, the conductor diameter is considerably smaller (thin) compared to the insulation core wire, so the spread of the conductor at the connection portion is also small, There is a fear of contact between the conductors before reaching the partition wall, and it is not preferable that the conductor is exposed by stripping the insulation core wire before reaching the partition wall.
On the other hand, since the insulation core wire is thicker than the conductor by the thickness of the insulation coating, if the pair of insulation core wires is simply partitioned by a partition wall, the pair of conductors greatly expands beyond that (connection portion). This causes the above problems.

On the other hand, if the upper edge of the partition wall is inclined downward toward the output cable, and the insulation core wire of the output cable is led to the connection portion through the upper edge of the downward slope, the partition wall spreads to the insulation core wire. It is after the outermost diameter part of the insulation core wire touches the partition wall, the upper edge of the partition wall is inclined downward toward the output cable, and the thickness gradually decreases toward the output cable. In this case, the position where the partition wall touches the outermost diameter portion of the insulated core wire approaches the connecting portion, and a reasonable and stable trajectory of the insulated core wire can be obtained, and the spread of the pair of conductors can be suppressed (FIG. 4). (See (a)).

  On the other hand, if the length of the partition wall (the length in the left-right direction in FIG. 4) is shortened, the spread of the pair of conductors can be suppressed, but the length of the insulation core wire coating stripped length (exposed conductor length) is reduced due to the shorter partition wall For example, if the partition wall is shortened, the exposed conductor length cannot be longer than the partition wall length because it is necessary to prevent contact between the pair of conductors. Usually, when the length of the exposed conductor is long, a sufficient contact length can be ensured by simply facing (opposing) the conductor of the insulated core wire to the lead terminal, but when the length of the exposed conductor is short, Connection work such as the need for accurate alignment of conductors and lead terminals to obtain sufficient contact length is not possible if both sides are merely facing. However, if the positioning becomes inadequate or the alignment is insufficient, problems such as weak connection strength may occur.

Also, when setting the insulation core wire of the output cable to the lead terminal, the insulation core wire is usually brought into contact with the lead terminal from above the partition wall with the partition wall as a boundary. If it protrudes (if it protrudes as indicated by symbol e in FIG. 9B), the protruding portion interferes with the guidance of the insulating core wire, resulting in poor workability.
On the other hand, if the upper edge of the partition wall is inclined downward toward the output cable, there is no protrusion, and the inclined upper edge functions as a guide for the insulated core wire. Can be set smoothly (see FIG. 4B). In addition, in FIG.1, FIG.2, FIG.4 (b) and FIG.9 (b), the upper edge of the partition 22 is a lower side.

  Since the present invention suppresses the spread of the pair of conductors of the output cable as described above, a sufficient contact area between the lead terminal and the conductor can be secured in the connection between the pair of lead terminals and the pair of conductors. Connection strength can be obtained. In addition, the insulated core wire of the output cable can be set smoothly on the lead terminal.

As an embodiment of the present invention, a rotation detection element that detects a magnetic field variation due to rotation of a detected object and converts it into an electrical signal is attached to a holder, and output from the rotation detection element via a pair of lead terminals of the rotation detection element In the rotation detection sensor from which the cable is pulled out, a partition wall is formed in the holder in both connection portions of the pair of lead terminals and the conductor of the output cable pair, and an upper edge of the partition wall is formed on the output cable. Adopting a structure in which the partition wall is gradually decreased toward the output cable, and the insulation core of the output cable is led to the connecting portion through the upper edge of the downward gradient. be able to.
The degree of inclination is appropriately set in consideration of the insulating properties of the partition walls, the creeping insulation distance, and the like.

This configuration smell Te, the respective side of the holder conductor of the pair in the upper Symbol connecting portion, by forming the side walls preventing movement of the side of the conductor, by its sidewall, the movement of the pair of conductors Since it is regulated, the positioning of the conductor can be ensured, and the contact area between the lead terminal and the conductor can be reliably ensured.

  1 to FIG. 3, the wheel speed sensor P of this embodiment is similar to the wheel speed sensor P shown in FIG. 7 and FIG. A lead piece (lead terminal) 12 is led out in parallel, and an electronic component 13 such as a capacitor is provided between the two lead pieces 12, 12.

  As shown in FIGS. 2 and 3, the resin molded product holder 20 includes a base portion 20a and a lid portion 20b constituting a main body, and a fitting groove 14 for the Hall IC 11 is formed in the base portion 20a. A fitting groove of the lead piece 12 can also be formed. The Hall IC fitting groove 14 fits the Hall IC 11 with a slight gap so that stress due to fitting does not occur in the Hall IC 11. The lid portion 20b is attached to the base portion 20a by fitting the hook 21a of the base portion 20a into the fitting hole 21b.

The hook 21a is formed in a piece on the rear side of the holder base 20a. When the detection part a is mounted on the base 20a, the piece is formed between the pair of lead pieces 12 and 12 from the Hall IC 11. It becomes the partition 22 of both the lead pieces 12 and 12 and the both sides of this partition 22 become the connection parts 9 and 9 of the pair of flexible conductors 6b and 6b of the output cable 6 to the lead pieces 12 and 12.
The upper edge (lower edge in FIG. 1) of the partition wall 22 is inclined downward toward the output cable 6 and gradually becomes thinner in the same direction.

  The connection portions 9 and 9 partitioned by the partition wall 22 are connected to the insulation core wires 6a and 6a after the insulation core wires 6a and 6a of the output cable 6 are guided to the connection portion through the upper edge 22a of the downward gradient. The flexible conductors 6b and 6b exposed by peeling off the insulation coating are connected to the lead pieces 12 and 12 by soldering, resistance welding or the like, respectively.

  Thus, if the insulating core wires 6a and 6a of the output cable 6 are led to the connecting portions 9 and 9 through the upper edge 22a of the descending slope, the partition wall 22 spreads and acts on the insulating core wires 6a and 6a. After the outermost diameter portion of the insulating core wires 6a, 6a touches the partition wall 22, the upper edge 22a of the partition wall 22 is inclined downward toward the output cable 6 as shown in FIG. 4 (b). For example, the position where the partition wall 22 touches the outermost diameter portion of the insulating core wires 6a and 6a approaches the connecting portion 9, and the spread of the pair of flexible conductors 6b and 6b is suppressed as shown in FIG. Therefore, in the connection between the pair of lead pieces 12 and 12 and the pair of flexible conductors 6b and 6b, a sufficient contact area between the lead pieces 12 and 12 and the flexible conductors 6b and 6b can be secured, and an effective connection strength can be obtained. It is done.

  Further, as shown in FIG. 4A, the thickness of the partition wall 22 gradually decreases toward the output cable 6 (both side surfaces 22b are inclined surfaces that gradually approach toward the output cable 6. For this reason, the degree of spread of both the insulated core wires 6a and 6a is further suppressed, the contact area between the lead pieces 12 and 12 and the flexible conductors 6b and 6b can be sufficiently secured, and an effective connection strength can be obtained.

  Further, a side wall 23 is provided on each side holder 20 of the pair of flexible conductors 6b and 6b in the connecting portions 9 and 9, and the side wall 23 allows the side of the pair of flexible conductors 6b and 6b. Movement (upward or downward in FIG. 4A) is restricted, the positioning of the flexible conductors 6b and 6b is ensured, and the contact area between the lead pieces 12 and 12 and the flexible conductors 6b and 6b is reliable. Secured.

When setting both insulated core wires 6a, 6a of the output cable 6 to the lead pieces 12, 12, first, the exposed flexible conductors 6b, 6b at the ends of the insulated wires 6a, 6a are pocket portions formed by the side wall 23 ( And inserted into a space surrounded by the side wall 23 and the partition wall 22, and then the insulating core wires 6 a and 6 a are placed along the partition wall 22 so as to sandwich the partition wall 22.
The effect of inserting the tips of the exposed flexible conductors 6b and 6b into the pocket portion and the effect of the partition wall 22 entering between the insulated core wires 6a and 6a (with the partition wall 22 sandwiched between the insulated core wires 6a and 6a) have almost no time difference. It is done continuously. For this reason, if the shape of the partition wall 22 (the shape having the protrusions e) shown in FIG. 9 is used, the actions of both are performed almost simultaneously, so that the tips of the exposed flexible conductors 6b and 6b come off the pocket portion. Therefore, the insulating core wires 6a and 6a are likely to be greatly expanded by the partition wall 22.

On the other hand, when the upper edge 22a of the partition wall 23 is inclined downward toward the output cable 6 (unless the shape of the protrusion e in FIG. 9B), the tips of the exposed flexible conductors 6b and 6b. 9 and the operation of inserting the partition wall 22 between the insulating core wires 6a and 6a (with the partition wall 22 sandwiched between the insulating core wires 6a and 6a) have a considerable time difference compared to the embodiment of FIG. Then, after the tips of the exposed flexible conductors 6b and 6b are inserted into the pocket portion and stabilized, the partition wall 22 enters between the insulated core wires 6a and 6a, and the spread of the insulated core wires 6a and 6a is suppressed as much as possible. It is done. Further, since the inclined upper edge 22a of the partition wall 22 performs a function of guiding the insulated core wires 6a and 6a (to guide the insulated core wire 6a), the function of the partition wall 22 entering between the insulated core wires 6a and 6a is also smooth. Made.
As described above, if the insulating core wires 6a and 6a are set on the lead pieces 12 and 12 so that the spreading of the insulating core wires 6a and 6a is suppressed as much as possible, the contact between the exposed flexible conductors 6b and 6b and the lead pieces 12, 12 The area is increased, and stable connection work can be performed.

If the output cable 6 is connected to the lead pieces 12 and 12 of the detection unit a set in the holder 20, as shown in FIG. 1, the fixing bracket 10 is embedded and the holder 20, the detection unit a and the output cable 6 are connected. A part is resin-coated 4 to obtain a wheel speed sensor P.
Since the wheel speed sensor P does not have the magnet 3, a magnetic encoder magnetized so that the S pole and the N pole are alternately continued in the circumferential direction on the outer peripheral edge thereof is used for the detection object B. .

  As shown in FIGS. 5 and 6, the detection part a can be attached to the holder 20 as long as the lead piece 12 is straight as long as the present invention can be adopted.

  The embodiment is a wheel speed sensor P in which the entire holder 20 is directly coated with the resin coating 4. However, as shown in FIG. 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 The exploded perspective view of the detection part of the embodiment Exploded perspective view of the holder It is an effect | action figure of the Example, (a) is a top view, (b) is a front view Exploded perspective view of another embodiment Perspective view of another embodiment Cutaway front view of the main part of the conventional example The exploded perspective view of the detection part of the conventional example It is an operation view of the conventional example, (a) is a plan view, (b) is a front view

Explanation of symbols

2, 20 Holder 4 Resin coating 6 Output cable 6a Insulated core 6b of output cable Flexible conductor 9 of output cable Connection portion 10 between lead terminal of rotation detecting element and flexible conductor of output cable 10 Fixing bracket 11 Rotation detecting element (hole) IC)
12 Lead terminal (lead piece)
13 Electronic component 14 Hall IC fitting groove a Detector P Wheel speed sensor B Detected object

Claims (2)

A rotation detection element (11) that detects a magnetic field variation due to rotation of the detection object (B) and converts it into an electric signal is attached to a holder (20), and the rotation detection element (11) is connected to the rotation detection element (11). In the rotation detection sensor (P) that has pulled out the output cable (6) through the pair of lead terminals (12, 12),
The two connection portions (9, 9) are connected to the holder (20) in both connection portions (9, 9) between the pair of lead terminals (12, 12) and the pair of conductors (6b, 6b) of the output cable (6). 9) is formed, and the upper edge (22a) of the partition wall (22) is inclined downward toward the output cable (6), and the thickness of the partition wall (22) is set to the output power. The insulation core wire (6a, 6a) of the output cable (6) is gradually thinned toward the cable (6) and passes through the upper edge (22a) of the descending slope to the connection portion (9, 9). A rotation detection sensor characterized by being guided. Side walls (23) that prevent lateral movement of the conductors (6b, 6b) are placed on the respective side holders (20) of the pair of conductors (6b, 6b) in the connection portions (9, 9). 23). The rotation detection sensor according to claim 1, wherein the rotation detection sensor is provided.

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