JP2009058524A - Rotation detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotation detector which reliably achieves continuity between sensor section and signal cable. <P>SOLUTION: In this rotation detector, a terminal 21 is extensionally-attached to a rotation detecting IC2 so as to be led out from an IC chip, while an electric cable 31 of a wire 3 forming transmission line consists of two or more fine twisted wires and is covered with a coating section 32. Two sets of the electric cable 31 covered with this coating section 32 are arranged. One end of this electric cable 31 is joined with the tip of terminal 21 by fusion of either the tip of terminal 21 or the one end of electric cable 31 through micro tig welding, while the other end of electric cable 31 is connected with external equipment (for example, an ECU for ABS control). Further the wire 3 is covered with a first resin member 5 to be integrally arranged. In addition, the joint area between the electric cable 31 and the terminal 21 is covered with a scond resin member 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rotation detection device that detects a rotation of a detection target, and is suitable for use in, for example, a wheel speed sensor.

A conventional rotation detection device includes a sensor unit for detecting rotation and a signal cable for transmitting a detection signal detected by the sensor unit to an external device, and the sensor unit and the signal cable have a metal terminal. Connected through. A sensor part is joined to one end of the terminal by soldering, and a signal cable is joined to the other end by caulking (see, for example, Patent Document 1).
JP 2000-171475 A (page 4, left column, line 10 to page 5, left column, line 7, line 2)

  However, in the above rotation detection device, since the sensor unit and the signal cable are connected via the terminal, the number of parts increases and the cost increases, and the process of joining the sensor unit and the signal cable to the terminal is performed. is necessary. Furthermore, there is a problem that a space for arranging the terminals is required, and the rotation detection device cannot be downsized.

  From this, it is conceivable to join the sensor part and the signal cable directly by soldering without using the terminal, but the sensor part and the signal cable are caused by heat and pressure generated when resin molding the outer wall of the rotation detection device. The solder that joins the signal cable is melted, resulting in poor conduction between the sensor unit and the signal cable.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a rotation detection device that can reliably connect a sensor unit and a signal cable.

  In order to solve the above-described problem, in claim 1, a rotation detection unit having a terminal for detecting rotation of a detection target and outputting the detection signal is connected to a terminal of the rotation detection unit, and the detection signal is In a rotation detection device including a transmission line for transmission to an external device, the terminal of the rotation detection unit and the transmission line are characterized by melting and joining the terminal or the transmission line by micro-tig welding.

  With this configuration, since the terminal of the rotation detection unit and the transmission line are joined by micro-tig welding, the terminal of the rotation detection unit and the transmission line are generated by heat and pressure generated when the outer wall of the rotation detection device is molded with resin. Therefore, it is possible to suppress the occurrence of poor conduction between the terminal of the rotation detection unit and the transmission line. In addition, since the terminal of the rotation detection unit and the transmission line are joined by microtig welding that melts and joins the terminal of the rotation detection unit and the transmission line, a welding rod is unnecessary and the welding magnetic pole is not used. Since the contact is sufficient, the terminal of the rotation detection unit and the transmission line can be joined without taking time and effort.

  According to a second aspect of the present invention, the conductor of the transmission line is formed by twisting a plurality of thin electric wires, and a joint portion to be joined to the terminal of the conductor is previously melted.

  With this configuration, the transmission line electric wire is formed by twisting together a plurality of thin electric wires, so that the welding location to be joined with the terminal of the rotation detection unit of the electric wire is melted and hardened in advance. Sometimes, the thin conducting wire does not vary and can be reliably joined, so that the transmission line and the terminal can be easily joined.

  According to a third aspect of the present invention, an electronic component having a lead joined to the transmission line is provided while reducing noise from the transmission line to the rotation detection unit, and the lead of the electronic component joins the terminal and the transmission line. In this case, it is characterized in that it is joined at the joint between the terminal and the transmission line at the same time.

  With this configuration, the lead of the electronic component is joined at the joint between the terminal of the rotation detection unit and the transmission line at the time of joining the terminal of the rotation detection unit and the transmission line. Thus, since the terminal of the rotation detecting unit and the lead of the electronic component can be joined to the transmission line, the joining process can be simplified.

  According to a fourth aspect of the present invention, the housing includes a housing for covering the rotation detecting unit, and a first covering member that is formed in advance and holds and covers the rotation detecting unit side of the transmission line. The first resin member is molded with resin so as to cover the joint portion between the housing and the first cover member.

  With this configuration, when the housing and the first covering member are coupled, and the first resin member is resin-molded so as to cover the coupling portion, the rotation detection unit side of the transmission line is covered with the first covering member. Since the resin molding pressure is difficult to be applied to the transmission line, the transmission line is exposed to the outside of the first resin member due to the resin molding pressure. Can be suppressed.

  According to a fifth aspect of the present invention, the first resin member is also filled in the interior of the housing and the interior of the first cover member, and the junction between the terminal and the transmission line is the interior of the housing or the first cover member. The transmission line provided inside and provided in the first resin member has a curved portion and is held by the first resin member.

  When the transmission line is held by the first resin member, the transmission line is pulled by the resin molding pressure. However, if the transmission line is linear, the transmission line is pulled to the joint between the transmission line and the terminal of the rotation detection unit. There is a risk of poor bonding due to force. In the present invention, since the transmission line is not linear but has a curved portion, even when the transmission line is held by the first resin member, even if the transmission line is pulled by the resin molding pressure, the curved portion Absorbs the pulling force, and it is possible to suppress the pulling force from being applied to the joint portion between the transmission line and the terminal of the rotation detecting unit, and to prevent the occurrence of poor bonding.

  According to a sixth aspect of the present invention, the transmission line includes a housing for covering the rotation detection unit, the transmission line has a curved portion, and the joint between the terminal and the transmission line is provided in the housing or at a position close to the housing. The second resin member is resin-molded so as to cover a part of the housing and the curved portion.

  When the transmission line is held by the second resin member, the transmission line is pulled by the resin molding pressure. However, if the transmission line is linear, the transmission line is pulled at the joint between the transmission line and the terminal of the rotation detection unit. There is a risk of poor bonding due to force. In the present invention, since the transmission line is not linear but has a curved portion, even when the transmission line is held by the second resin member, even if the transmission line is pulled by the resin molding pressure, the curved portion Absorbs the pulling force, and it is possible to suppress the pulling force from being applied to the joint portion between the transmission line and the terminal of the rotation detecting unit, and to prevent the occurrence of poor bonding.

  According to a seventh aspect of the present invention, the second covering member is formed in advance and covers the entire rotation detecting unit and the rotation detecting unit side of the transmission line, and the second covering member holds the transmission line on the inner periphery. The third resin member is resin-molded so as to cover the boundary portion between the second cover member and the transmission line.

  With this configuration, when the third resin member is resin-molded so as to cover the boundary portion between the second covering member and the transmission line, the rotation detection unit side of the transmission line is held on the inner periphery of the second covering member. Therefore, since the transmission line does not move due to the resin molding pressure, it is possible to prevent problems such as the transmission line being exposed to the outside of the third resin member.

  According to another aspect of the present invention, the third resin member is also filled in the second covering member, the joint between the terminal and the transmission line is provided in the second covering member, and the second covering member is provided. The transmission line provided in the member has a curved portion and is held by a third resin member.

  When the transmission line is held by the third resin member, the transmission line is pulled by the resin molding pressure. However, if the transmission line is linear, the transmission line is pulled at the joint between the transmission line and the terminal of the rotation detection unit. There is a risk of poor bonding due to force. In the present invention, since the transmission line is not linear but has a curved portion, even when the transmission line is held by the third resin member, even if the transmission line is pulled by the resin molding pressure, the curved portion Absorbs the pulling force, and it is possible to suppress the pulling force from being applied to the joint portion between the transmission line and the terminal of the rotation detecting unit, and to prevent the occurrence of poor bonding.

  According to a ninth aspect of the present invention, the outer peripheral portion of the transmission line held by any of the first to third resin members is formed in an uneven shape.

  With this configuration, by forming the outer peripheral portion of the transmission line held by one of the first to third resin members into an uneven shape, the first to third resin members are formed in the concave portion of the outer peripheral portion of the transmission line. Since either of them penetrates, the transmission line can be firmly held in the longitudinal direction, and when the transmission line is held by any of the first to third resin members, it is pulled in the longitudinal direction by the resin molding pressure. Even if it is, it can suppress more that tensile force is applied to the junction part of a transmission line and the terminal of a rotation detection part.

  According to a tenth aspect of the present invention, the conducting wire of the transmission line is formed by twisting a plurality of thin electric wires, and the joint portion to be joined with the terminal of the conducting wire is preliminarily hardened by resistance welding.

  With this configuration, the transmission line electric wire is formed by twisting together a plurality of thin electric wires, so that by welding the joint portion to be joined with the terminal of the rotation detection unit of the electric wire in advance by welding, Sometimes, the thin conducting wire does not vary and can be reliably joined, so that the transmission line and the terminal can be easily joined.

Further, in claim 11, a part of the transmission line held by any one of the first to third resin members in the method of manufacturing a rotation detection device according to any one of claims 5, 6 and 8. In addition, a substantially U-shaped curved portion having a predetermined deformation amount in the radial direction is formed, and the predetermined deformation amount is in the radial direction from the center of the transmission line to the outer peripheral surface of the substantially U-shaped inner side. The following relational expression is established, where X is the length in the radial direction from the center of the transmission line to the inner surface of the substantially U-shaped inner side, and φ is the outer diameter of the transmission line: In this state, the curved portion of the transmission line is held by the second resin member or the fourth resin member.
0.3φ ≦ X ≦ 1.2φ
With this configuration, the curved portion of the transmission line is held by any of the first to third resin members in a state where the above relational expression is established between the predetermined deformation amount and the outer diameter of the transmission line. Thus, even if the transmission line is pulled in the longitudinal direction by the resin molding pressure generated during the resin molding, the curved portion of the transmission line can reliably absorb the tensile force. Furthermore, since the curved portion of the transmission line is not bent suddenly, it is possible to suppress the occurrence of adverse effects such as poor conduction of the conductor of the transmission line.

  FIG. 1 is a view showing an assembled state of the wheel speed sensor 1. FIG. 2 is a longitudinal sectional view showing the configuration of the wheel speed sensor 1 shown in FIG. 3 is a cross-sectional view taken along arrow III-III in FIG. FIG. 4 is a diagram illustrating a manufacturing process of the wheel speed sensor 1. FIG. 5 is a diagram illustrating a bonding process between the rotation detection IC 2 and the wire 3.

  First, the mounting position of the wheel speed sensor 1 will be described with reference to FIG.

  A bearing 101 is provided on the outer periphery of the wheel shaft 100 near the wheel. The bearing 101 includes an inner ring 101a, an outer ring 101b, and a rolling element 101c having different radii. The inner ring 101a is fixed to the outer peripheral surface of the wheel shaft 100 and rotates together with the wheel shaft 100, and the outer ring 101b is fixed to the vehicle body (not shown). Oil seals 102a and 102b are provided at both ends of the inner ring 101a and the outer ring 101b so as to be sandwiched between the inner ring 101a and the outer ring 101b, and grease filled between the inner ring 101a and the outer ring 101b is provided. It is designed not to leak. A magnetized rotor 103 is joined to one (102a) of these oil seals 102a and 102b, and is configured to rotate as the inner ring 101a of the bearing 101 rotates. The magnetized rotor is a ring-shaped rotor, and N poles and S poles are alternately magnetized in the circumferential direction, and are arranged coaxially with the wheel shaft 100 so as to surround the outer periphery of the wheel shaft 100. .

  On the other hand, a window portion 101d is formed in the outer ring 101b, and the wheel speed sensor 1 is press-fitted and fixed to the window portion 101d. In the wheel speed sensor 1, the rotation detection IC 2 protrudes from the window portion 101 d, and the rotation detection IC 2 is arranged to face the magnetized rotor 103. Note that an O-ring 104 is disposed on the outer peripheral surface of the wheel speed sensor 1 so that intrusion of water or the like through the window portion 101d can be prevented.

  As shown in FIGS. 2 and 3, the rotation detection IC 2 of the wheel speed sensor 1 processes an output signal from an MRE (magnetoresistance effect) element or a MRE element as a sensing element that generates an output accompanying a change in a magnetic field. An IC chip and a magnet provided with a signal processing circuit and the like are molded together with the terminal 21 by a resin. The rotation detection IC 2 is accommodated in a housing 4 constituting a hollow case in which one end side forms an inlet and the other end side is closed. Hereinafter, the direction in which the rotation detection IC 2 is inserted in the housing 4 is defined as the X direction.

  The outer diameter of the housing 4 is a substantially quadrangular prism, and the cross-sectional shape in the direction perpendicular to the X direction is a substantially rectangular shape. Of the side surfaces of the rectangular column of the housing 4, the surface 41 facing the magnetized rotor 100 is a detection surface, and the stepped portion 43 is formed on the closed end side of the housing 4 in the surface 42 opposite to the surface 41. Is formed. Further, the distance between the four side faces of the quadrangular prism constituting the housing 4 is set to be approximately equal to or slightly larger than the thickness of the rotation detection IC 2. A groove 44 parallel to the X direction is formed on the surface 42 on which the portion 43 is formed, and a gap is formed between the housing 4 and the rotation detection IC 2 at this portion. The resin is filled in the housing 4 during resin molding described later.

  Further, on the inlet side of the housing 4, a flange portion 45 is formed on the surfaces 41, 42 by projecting the outer edge of the housing 4 in a direction perpendicular to the X direction from other portions, and the housing passes through the tip of the flange portion 45. The outer edge of 4 is formed with a protrusion 46 that protrudes the outer edge of the housing 4 in a direction perpendicular to the X direction. The flange portion 45 and the protruding portion 46 are formed on the entire outer edge of the housing 4. Furthermore, a protruding portion 47 is formed on the entrance side of the housing 4 by partially protruding two opposing side surfaces out of the four side surfaces constituting the quadrangular prism in the direction opposite to the X direction.

  On the other hand, a terminal 21 is extended to the rotation detection IC 2 so as to be drawn from the IC chip.

  The electric wire 31 of the wire 3 constituting the transmission line is formed by twisting a plurality of thin wires, and is covered with a covering portion 32. Two sets of electric wires 31 covered with the covering portion 32 are provided. One end of the electric wire 31 is joined to the front end portion of the terminal 21 by melting the front end portion of the terminal 21 or one end of the electric wire 31 by microtig welding. The other end of the electric wire 31 is connected to an external device (for example, an ECU for ABS control). Furthermore, the wire 3 is integrally provided by being covered and held by the first covering member 5.

  The first cover member 5 is formed with a concave notch 51 on the side where the electric wire 31 is joined to the terminal 21. A protrusion 47 at the tip of the housing 4 is fitted into the notch 51 so that the first cover member 5 and the housing 4 are fixed.

  The rotation detection IC 2, the wire 3, the housing 4, and the first cover member 5 configured as described above are integrated by a first resin member 6 formed by resin molding. Specifically, the flange portion 45 (inlet side) of the housing 4, the inside of the housing 4, and a part of the outer periphery of the first cover member 5 are covered with the first resin member 6. Further, the joint portion between the electric wire 31 and the terminal 21 is also covered with the first resin member 6. On the outer periphery of the first resin member 6, there is provided a stay 7 on which a fixing portion 71 for fixing the wheel speed sensor 1 to the vehicle body is formed.

  Next, the manufacturing method of the wheel speed sensor 1 is demonstrated based on FIG.

  First, as shown in FIG. 4A, the outer peripheral portion of the wire 3 is removed so that the covering portion 32 provided inside the wire 3 is exposed. Further, the covering portion 32 is removed so that the electric wire 31 provided inside the covering portion 32 is exposed. And the front-end | tip part (joint location with the terminal 21) of the electric wire 31 is fuse | melted by micro tig welding, and the welding ball 33 is formed. Next, as shown in FIG. 4B, the wire 3 is held by the first covering member 5.

  Further, as shown in FIG. 4C, cutting and bending are performed so that the tip of the terminal 21 of the rotation detection IC 2 coincides with the position of the welding ball 33. Next, as shown in FIG. 4D, the rotation detection IC 2 is held on the first covering member 5 so that the tip of the terminal 21 and the position of the welding ball 33 of the wire 3 coincide. In addition, the position which hold | maintains rotation detection IC2 and the wire 3 is decided for the 1st cover member 5, The length of the electric wire 31 and the terminal 21 is decided beforehand. And the welding ball 33 and the front-end | tip part of the terminal 21 are fuse | melted and joined by micro TIG welding. In addition, the joining location of the welding ball 33 and the front-end | tip part of the terminal 21 is not covered with the 1st cover member 5, but is exposed. Moreover, the description about micro TIG welding is mentioned later.

  Then, as shown in FIG. 4E, the housing 4 is fixed to the first covering member 5 so as to cover the rotation detection IC 2. At this time, the protruding portion 47 of the housing 4 is fitted into the cutout portion 51 of the first covering member 5. Finally, as shown in FIG. 4 (f), the first resin member 6 is formed by resin molding so as to cover the first cover member 5 and the housing 4. At this time, the first resin member 6 enters the housing 4 and the first cover member 5, and the interior of the housing 4 and the first cover member 5 is filled with the first resin member 6. .

  The welding ball 33 and the tip of the terminal 21 are joined in a state where the rotation detection IC 2 is not held by the first cover member 5 but is held by another member (for example, a support member used only during manufacturing). Also good. In this way, the thickness of the housing 4 can be reduced.

  Next, the above-described microtig welding will be described with reference to FIG.

  First, as shown in FIG. 5A, the wire 3 and the rotation detection IC 2 are provided so that the welded portion 33 of the electric wire 31 and the tip of the terminal 21 of the rotation detection IC 2 slightly overlap.

And as shown in FIG.5 (b), the electric wire 31 and the terminal 21 are connected to the earth | ground 11, and the part with which the welding ball of the electric wire 31 and the front-end | tip part of the terminal 21 have overlapped with the micro tig welder 10 is shown. It is melted and joined by electric discharge (see FIG. 4C). In this case, only the welding ball 33 of the electric wire 31 may be melted by a micro-tig welder and joined to the tip of the terminal 21.
[Effect of Example 1]
As described above, in the wheel speed sensor 1 of this embodiment, the electric wire 31 of the wire 3 and the terminal 21 of the rotation detection IC 2 are joined by melting the electric wire 31 and the terminal 21 by micro-tig welding. Since the joining location between the electric wire 31 and the terminal 21 can be prevented from being melted by the heat and pressure generated when the first resin molding 6 is formed by resin molding, the joining between the electric wire 31 and the terminal 21 is peeled off. This can be suppressed, and the occurrence of poor conduction between the electric wire 31 and the terminal 21 can be suppressed.

  Moreover, since the joining of the electric wire 31 and the terminal 21 is performed by microtig welding that melts and joins the electric wire 31 and the terminal 21, a welding rod used during normal welding becomes unnecessary, and a welding magnetic pole is provided. Since it is non-contact, since the electric wire 31 and the terminal 21 can be joined without taking time and effort, the manufacturing process can be simplified.

  Furthermore, unlike the prior art, the rotation detection IC 2 and the wire 3 are not connected via a metal terminal, and the number of parts can be reduced, so that the rotation detection device 1 can be configured at low cost, The rotation detection IC 2 and the wire 3 can be joined in a small space.

  Furthermore, since the electric wire 31 is formed by twisting a plurality of thin wires with the covering portion 32, welding the tip portion of the electric wire 31 to be joined to the terminal 21 in advance and solidifying it into a spherical shape. Since a plurality of thin lines do not sometimes break apart and can be reliably bonded, all the electric wires 31 can be electrically connected to the terminal 21 and can be easily bonded.

  In addition, when the housing 4 and the first cover member 5 are coupled and resin molding is performed by the first resin member 6 so as to cover the outer periphery of the coupled portion, a part of the wire 3 on the rotation detection IC side is the first. Since it is covered and held by one covering member 5, the wire 3 can be hardly moved by the resin molding pressure, and the wire 3 is exposed to the outside of the first resin member 6. Can be prevented.

  6 is a cross-sectional view showing the configuration of the wheel speed sensor shown in FIG. 7 is a cross-sectional view taken along arrow VII-VII in FIG. Here, the same parts as those in the first embodiment are omitted, and only different parts will be described.

  As shown in FIG. 6, the wheel speed sensor 1 of the present embodiment includes a capacitor 8 that constitutes an electronic component for reducing noise from the wire 3 to the rotation detection IC 2. The capacitor 8 is used when not incorporated in the rotation detection IC 2.

  The capacitor 8 is provided in the housing 4 and is provided closer to the entrance side of the housing 4 in the X direction than the rotation detection IC 2. Furthermore, it is provided closer to the closing side in the X direction than the junction between the electric wire 31 and the terminal 21. The capacitor 8 is positioned and provided on the inner wall of the housing 4 as shown in FIG.

  A lead 81 is extended to the capacitor 8. The lead 81 is provided so as to extend in parallel with the electric wire 31, and the leading end portion of the lead 81 is joined together at a joint portion between the electric wire 31 and the terminal 21. The lead 81 is joined to the electric wire 31 at the same time as the electric wire 31 and the terminal 21 are joined.

  With the above configuration, by providing the capacitor 8 separately from the rotation detection IC 2 in the wheel speed sensor 1 in which the capacitor 8 is not incorporated, noise from the wire 3 to the rotation detection IC 2 can be reduced. Thereby, destruction of the rotation detection IC 2 due to static electricity from the wire 3 can be prevented and malfunction of the rotation detection IC 2 due to electromagnetic waves from the wire 3 can be prevented.

  Moreover, since the lead 81 of the capacitor 8 is joined to the joint portion between the electric wire 31 and the terminal 21 at the same time when the electric wire 31 and the terminal 21 are joined, the terminal 21 and the lead 81 are joined only once. And the electric wire 31 can be joined to one joining location, so that the joining process is not increased.

  FIG. 8 is a cross-sectional view showing a configuration of the wheel speed sensor shown in FIG. Here, the same parts as those in the first embodiment are omitted, and only different parts will be described.

  As shown in FIG. 8, in the wheel speed sensor 1 of the present embodiment, the capacitor 8 is incorporated in the terminal 21 and provided integrally.

  In this way, by integrating the capacitor 8 into the terminal 21, it is not necessary to join the lead 81 of the capacitor 8 together at the joint between the electric wire 31 and the terminal 21 as in the second embodiment.

  FIG. 9 is a cross-sectional view in the axial direction of the wheel speed sensor 1 according to this embodiment. FIG. 10 is an enlarged view of the wire 3 shown in FIG. FIG. 11 is a diagram illustrating a manufacturing process of the wheel speed sensor 1 according to the present embodiment. FIG. 12A is a perspective view showing a state after the outer periphery of the covering portion 32 of the wire 3 is made uneven. FIG. 12B is a diagram showing the shape of the outer peripheral portion 34 of the wire 3.

  In the first embodiment, the housing 4 and the first cover member 5 are formed separately, but in this embodiment, the housing 4 and the first cover member 5 are integrated as shown in FIG. The second cover member 40 is configured as described above. In addition, the wire 3 provided in the second covering member 40 has a curved portion 30 and is held by a second resin member 60 filled in the second covering member 40. The second resin member 60 corresponds to the third resin member in the claims.

  Here, the curved portion 30 of the wire 3 will be described.

As shown in FIG. 10, the curved portion 30 of the wire 3 is formed in a substantially U shape toward the deformation direction (the radial direction of the wire 3). When the length from the radial center of the covering portion 32 to the outer peripheral surface 32a on the inner side of the curved portion 30 is X, and the outer diameter of the covering portion 32 is φ, the following relational expression (1) is satisfied. In addition, the wire 3 is deformed to form the curved portion 30.
0.3φ ≦ X ≦ 1.2φ (1)
Next, based on FIG.11 and FIG.12 (a), the manufacturing process of the wheel speed sensor 1 of a present Example is demonstrated.

  First, as in the first embodiment, as shown in FIG. 11A, the outer peripheral portion of the wire 3 is removed so that the covering portion 32 provided on the inner side of the wire 3 is exposed. The covering portion 32 is removed so that the electric wire 31 provided inside is exposed.

  Next, the wire 3 is held by the holding member 80 as shown in FIG. The holding member 80 is formed with a recess 80a for forming the above-described curved portion 30 in the wire 3, and the covering portion 32 of the wire 3 is held so as to coincide with the position of the recess 80a. Then, the press-fitting member 81 having the convex portion 81a is hot-pressed into the concave portion 80a of the holding member 80, whereby the covering portion 32 of the wire 3 is deformed into a substantially U-shape and the curved portion 30 is formed. In addition, the shape of the convex part 81a of the press-fitting member 81 and the concave part 80a of the holding member 80 is set in advance so that the deformation amount of the curved part 30 falls within the range of the above-described relational expression (1). Furthermore, as shown to Fig.12 (a), the contact surface 81b with the wire 3 of the convex part 81a of the press-fit member 81 and the contact surface 80b with the wire 3 of the recessed part 80a of the holding member 80 become uneven | corrugated shape, respectively. Then, the outer peripheral surface of the covering portion 32 is formed into an uneven shape by hot pressing the covering portion 32 of the wire 3 with the press-fitting member 81.

  Next, as shown in FIG. 11 (c), the tip end portion of the wire 31 of the wire 3 is resistance welded by a resistance welder 82. Then, as shown in FIG. 11D, the rotation detection IC 2 is placed on a holding member 90 different from the holding member 80 so that the tip of the terminal 21 of the rotation detection IC 2 and the tip of the electric wire 31 of the wire 3 coincide. The terminal 21 of the rotation detection IC 2 and the wire 31 of the wire 3 are joined by microdig welding.

  Then, as shown in FIGS. 11 (e) and 11 (f), the entire rotation detection IC 2 is inserted into the second covering member 40 formed in advance by resin molding, and the inner periphery of the second covering member 40 is inserted. Thus, a part of the wire 3 on the rotation detection IC 2 side is held. And as shown in FIG.11 (g), it resin-molds with the 2nd resin member 60 so that the outer periphery of the boundary part of the 2nd covering member 40 and the wire 3 may be covered. The second resin member 60 is also filled in the second cover member 40, and the wire 31 of the wire 3, the covering portion 32, the curved portion 30, the joint portion between the wire 31 and the terminal 21, and the terminal 21 are provided. It is held by the second resin member 60.

  In the present embodiment, the entire rotation detection IC 2 and a part of the wire 3 on the rotation detection IC 2 side are respectively held by the second covering member 40. However, as in the first example, the rotation detection IC 2 is It may be held by the housing 4 and the rotation detection IC 2 side of the wire 3 may be held by the first covering member 5.

  Further, the rotation detection IC 2 is held by the housing 4, and the wire 3 is not covered by the first or second covering member 5, 40 but is resin-molded by the first or second resin member 6, 60 in an exposed state. May be. The first or second resin member 6 or 60 at this time corresponds to the second resin member in the claims.

  As described above, when the second resin member 60 is filled in the second cover member 40 and the covering portion 32 of the wire 3 is held by the second resin member 60, the resin molding pressure is reduced. Therefore, if the covering portion 32 is linear, a tensile force is applied to the joint portion between the electric wire 31 and the terminal 21, which may cause poor bonding. In this configuration, since the covering portion 32 has the curved portion 30, even when the wire 3 is pulled in the longitudinal direction by the resin molding pressure when the covering portion 32 is held by the second resin member 60. The curved portion 30 can absorb the tensile force and suppress the tensile force from being applied to the joint portion between the electric wire 31 and the terminal 21, thereby preventing the occurrence of poor bonding.

The curved portion 30 has the following relationship when the outer diameter of the covering portion 32 is φ and the radial length from the center in the radial direction of the covering portion 32 to the outer peripheral surface 32a inside the curved portion 30 is X. It is held by the second resin member 60 in a state where Expression (1) is established.
0.3φ ≦ X ≦ 1.2φ (1)
Even if the covering portion 32 is pulled in the longitudinal direction by the resin molding pressure, the curved portion 30 and the covering portion 32 are held by the second resin member 60 in a state where the relational expression (1) is established. The curved portion 30 can reliably absorb the pulling force. Furthermore, since the bending part 30 is not bent suddenly, it can suppress that the conduction | electrical_connection defect of the conducting wire 31 in the bending part 30 generate | occur | produces.

  Furthermore, when the resin molding is performed by the second resin member 60 so as to cover the outer periphery of the boundary portion between the second covering member 40 and the wire 3, a resin molding pressure is applied to the wire 3. Since the covering member 40 holds a part of the wire 3, the wire 3 does not move due to the resin molding pressure, and the wire 3 is exposed to the outside of the second resin member 60. Can be prevented.

  Moreover, since the joint location joined to the terminal 21 of the rotation detection IC 2 of the electric wire 31 of the wire 3 is solidified by resistance welding, a plurality of thin electric wires 31 are not scattered at the time of micro-tig welding, and should be securely joined. Therefore, joining of the wire 3 and the terminal 21 can be facilitated.

  Furthermore, since the outer peripheral surface of the bending part 30 and the coating | coated part 32 becomes uneven | corrugated shape by heat-pressing the coating | coated part 32 of the wire 3, when hold | maintaining with the 2nd resin member 60, the bending part 30 and Since the second resin member 60 penetrates into the concave portion of the covering portion 32, the wire 3 can be firmly held in the longitudinal direction, and the wire 3 is pulled in the longitudinal direction by the resin molding pressure of the second resin member 60. This can be suppressed, and it can be further suppressed that a tensile force is applied to the joint portion between the electric wire 31 and the terminal 21.

  As shown in FIG. 12B, the outer peripheral surface of the outer peripheral portion 34 of the wire 3 is also formed in an uneven shape in advance, so that the outer peripheral surface of the outer peripheral portion 34 is held by the second resin member 60. Since the fourth resin member 60 penetrates into the recess, the wire 3 can be held more firmly in the longitudinal direction by the second resin member 60. After the resin molding by the second resin member 60, the wire Even if 3 is pulled in the longitudinal direction, it is possible to further suppress a tensile force from being applied to the joint portion between the electric wire 31 of the wire 3 and the terminal 21 of the rotation detection IC 2.

  In the first to fourth embodiments, the case of using the magnetized rotor 103 has been described. However, the wheel speed sensor 1 in the first to fourth embodiments can be applied to the case of using a gear-type rotor. It is.

  In the first to fourth embodiments, the case where the wheel speed sensor 1 is arranged in the thrust direction of the magnetized rotor 103 to detect rotation is described. However, the rotation detection is performed by arranging the wheel speed sensor 1 in the radial direction of the magnetized rotor 103. It is also applicable to the case where

  In the above description, the case where the present invention is applied to the wheel speed sensor 1 has been described. However, the present invention can also be applied to a rotation detection device other than the wheel speed sensor 1.

It is the figure which showed the assembly | attachment state of the wheel speed sensor in 1st Example of this invention. It is a longitudinal cross-sectional view which shows the structure of the wheel speed sensor shown in FIG. (First embodiment) FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2. (First embodiment) It is a figure which shows the manufacturing process of a wheel speed sensor. (First embodiment) It is a figure which shows the joining process of a rotation detection part and a transmission line. (First embodiment) It is sectional drawing which shows the structure of the wheel speed sensor shown in FIG. (Second embodiment) FIG. 7 is a sectional view taken along arrow VII-VII in FIG. 6. (Second embodiment) It is sectional drawing which shows the structure of the wheel speed sensor shown in FIG. (Third embodiment) It is an axial sectional view of a wheel speed sensor. (Fourth embodiment) FIG. 10 is an enlarged view of the wire shown in FIG. 9. (Fourth embodiment) It is the figure which showed the manufacturing process of the wheel speed sensor which concerns on a present Example. (Fourth embodiment) (A) is the perspective view which showed the outer periphery of the coating | coated part of a wire after making uneven | corrugated shape, (b) is the figure which showed the shape of the outer peripheral part of a wire. (Fourth embodiment)

Explanation of symbols

1 ... wheel speed sensor,
2 ... rotation detector,
3 ... Wire,
4 ... Housing,
5 ... 1st resin member,
6 ... Second resin member

Claims (11)

A rotation detector having a terminal for detecting the rotation of the detection target and outputting the detection signal;
In the rotation detection device that is connected to the terminal of the rotation detection unit and includes a transmission line for transmitting the detection signal to an external device,
The rotation detection device, wherein the terminal of the rotation detection unit and the transmission line are joined by melting the terminal or the transmission line by micro-tig welding.   The rotation detection device according to claim 1, wherein the conducting wire of the transmission line is formed by twisting a plurality of thin electric wires, and a joint portion to be joined to the terminal of the conducting wire is melted in advance. While reducing noise from the transmission line to the rotation detector, an electronic component having a lead joined to the transmission line is provided,
3. The rotation detection device according to claim 1, wherein the lead of the electronic component is joined simultaneously to a joint portion between the terminal and the transmission line when the terminal and the transmission line are joined. 4. . A housing for covering the rotation detection unit, and a first covering member that is formed in advance and holds and covers the rotation detection unit side of the transmission line;
The first resin member is resin-molded so that the housing and the first cover member are coupled and a coupling portion between the housing and the first cover member is covered. The rotation detection device according to any one of 1 to 3. The first resin member is also filled in the interior of the housing and the interior of the first cover member,
A joint between the terminal and the transmission line is provided in the housing or in the first cover member;
The rotation detection device according to claim 4, wherein the transmission line provided in the first resin member has a curved portion and is held by the first resin member. A housing for covering the rotation detector;
The transmission line has a curved portion,
A joint between the terminal and the transmission line is provided in the housing or at a position close to the housing;
The rotation detecting device according to any one of claims 1 to 3, wherein the second resin member is resin-molded so as to cover a part of the housing and the curved portion. A second covering member that is formed in advance and covers the entire rotation detection unit and the rotation detection unit side of the transmission line;
The second covering member holds the transmission line on the inner periphery,
The rotation detection device according to any one of claims 1 to 3, wherein a third resin member is resin-molded so as to cover a boundary portion between the second covering member and the transmission line. The third resin member is also filled in the second cover member,
A joint between the terminal and the transmission line is provided inside the second covering member;
The rotation detection device according to claim 7, wherein the transmission line provided in the second covering member has a curved portion and is held by the third resin member.   9. The outer peripheral portion of the transmission line held by any one of the first to third resin members is formed in a concavo-convex shape. 9. Rotation detection device.   2. The rotation according to claim 1, wherein the conductor of the transmission line is formed by twisting a plurality of thin electric wires, and a joint portion to be joined to the terminal of the conductor is solidified by resistance welding in advance. Detection device. In the manufacturing method of the rotation detecting device according to any one of claims 5, 6 and 8,
Forming a substantially U-shaped curved portion having a predetermined deformation amount in a radial direction in a part of the transmission line held by any of the first to third resin members;
The predetermined deformation amount is a length in a radial direction from the center of the transmission line to an inner peripheral surface of a substantially U-shape,
When the length in the radial direction from the center of the transmission line to the outer peripheral surface of the substantially U-shaped inner side is X, and the outer diameter of the transmission line is φ, the following relational expression is satisfied, A method of manufacturing a rotation detecting device, wherein a curved portion of a transmission line is held by the second resin member or the fourth resin member.
0.3φ ≦ X ≦ 1.2φ

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