JP5930309B2 - Rotation detecting device and manufacturing method thereof - Google Patents

Description

  The present invention relates to a rotation detection device including at least a rotation detection unit, a signal transmission member, an internal structure, and a rib, and a method for manufacturing the rotation detection device.

  The following technologies are disclosed as conventional rotation detection devices. First, a technology relating to a rotational speed sensor for preventing deviation of the internal position of the electric wire or the lead terminal and exposure to the outside without changing the external shape and suppressing vacuum voids generated during integral molding with resin. An example is disclosed (see, for example, Patent Document 1). This rotational speed sensor includes a position restricting member that restricts the position by inserting an electric wire or a lead terminal into the inside of the rotational speed sensor, and holds the position restricting member from the outside and is integrally formed with resin.

  Secondly, an example of a technology related to a plastic sensor that can be accurately manufactured and can stably position electrical components in a mold is disclosed (see, for example, Patent Document 2). The plastic sensor has at least one positioning member having a first housing part connected together and molecularly harmonized with the second housing part.

  Thirdly, an example of a technique related to a vehicle rotation detection device that aims to maintain a state in which a wire is bent with respect to the axis of a sensor body with high reliability while preventing an increase in the number of parts is disclosed. (See, for example, Patent Document 3). This vehicle rotation detection device prepares a molding die configured to change the arrangement angle of the mold side positioning portion around the axis of the sensor main body in the space forming the sensor main body, and arranges the mold side positioning portion. After adjusting the angle to an arbitrary angle, the first resin molding part is accommodated in the space, and the sensor side positioning part and the mold side positioning part are aligned.

  Fourth, there is an example of a technique related to a cable-integrated mold structure for the purpose of increasing the welding strength between a resin mold and a cable covering the sensor unit and the cable and reliably preventing water from entering between these interfaces. It is disclosed (see, for example, Patent Document 4). This cable-integrated mold structure is such that the resin is pressurized in the portion of the restrictor by forming a restrictor in the flow path of the resin that is poured at the time of resin molding at the portion where the cable is arranged, and the resin The resin mold is performed so that the temperature of the above is maintained.

  Fifth, an example of a technique related to a rotation detection device for the purpose of reliably connecting a sensor unit and a signal cable is disclosed (see, for example, Patent Document 5). In this rotation detection device, the terminal of the rotation detection unit and the transmission line are joined by melting the terminal or the transmission line by microtig welding.

JP 2004-257867 A Special table 2000-508068 JP 2006-322875 A JP 2000-0119185 A JP 2009-058524 A

  However, even if the techniques of Patent Documents 1 to 5 are applied, there are the following problems. First, the length (hereinafter simply referred to as “the length under the neck”) from the portion where the rotation detection device itself is attached (that is, the attachment portion of the stay or the like) to the sensor element for rotation detection (or the rotation detection portion including the sensor element). When the length is long, the length of the internal holding member (that is, the housing, the cable, etc.) to be held inside at the time of integral molding becomes long. In this case, the internal holding member cannot be sufficiently held, and the internal holding member is biased by the pressure at the time of integral molding.

  Secondly, as the length under the neck increases, the amount of resin required for integral molding also increases. As the amount of resin increases, the weight of the rotation detection device itself increases or the moldability deteriorates, which increases the cost of manufacturing the rotation detection device and deteriorates the shape and dimension accuracy.

  The present invention has been made in view of these points, and prevents the internal holding member (a signal transmission member or the like described later) from being biased, reduces the manufacturing cost of the rotation detection device, and reduces the dimensional accuracy. An object of the present invention is to provide a high-speed rotation detection device and a manufacturing method thereof.

  A first invention made to solve the above-mentioned problems is a rotation detection unit (18) that detects a rotation state of a rotating body and outputs a rotation detection signal, and a rotation detection unit that is electrically connected to the rotation detection unit. A rib forming portion (11) for transmitting a signal to the external device (50) and a plurality of ribs (14) formed so as to contact the outer peripheral surface of the signal transmitting member and extend radially outward. 13a), an internal structure (13) integrally molded by holding a signal transmission member and a rotation detector, and rib formation within the formation range of the plurality of ribs in the axial direction of the internal structure The portion is provided with at least one exposed portion (11d) for exposing the signal transmission member to the outside of the internal structure.

  According to this configuration, the internal structure is integrally formed of the resin including the exposed portion where the signal transmission member is exposed. In other words, the internal structure has a portion where a part of the signal transmission member is exposed after molding. Since the rib is formed to contact the outer peripheral surface of the signal transmission member and extend radially outward, the rib itself has a function of holding the signal transmission member as well as a function of restricting the mounting posture of the rotation detection device itself. Have both. Moreover, since the signal transmission member holds the signal transmission member with a mold or the like at the time of integral molding, the signal transmission member can be held and fixed at a desired position even when pressure is applied. Further, since the rib is formed in a plate shape, the amount of resin required for integral molding of the internal structure is suppressed to be small, and the moldability is improved. Therefore, the rotation detection device is reduced in weight, and the cost for manufacturing the rotation detection device can be reduced.

  The second invention is a rotation detection unit (18) that detects a rotation state of the rotating body and outputs a rotation detection signal, and is electrically connected to the rotation detection unit and transmits the rotation detection signal to the external device (50). A signal transmission member (11), and a rib forming portion (13a) provided with a plurality of ribs (14) formed in contact with the outer peripheral surface of the signal transmission member and extending radially outward. And a method of manufacturing the rotation detection device (10) including the internal structure (13) holding the rotation detection unit, and a bonding step of bonding the plurality of lead frames (18a) of the rotation detection unit and the signal transmission member; One internal structure having a rib forming portion provided with at least one exposed portion (11d) for exposing the signal transmission member to the outside of the internal structure within a range where the plurality of ribs are formed in the axial direction of the internal structure. And having a molding step of a resin molding.

  According to this configuration, the internal structure including the exposed part is integrally molded by the molding process. The plurality of ribs formed to extend outward in the radial direction hold the signal transmission member. Therefore, the signal transmission member can be held at a desired position even when pressure is applied during integral resin molding. Since the rib is formed in a plate shape, the amount of resin required for integral resin molding of the internal structure can be reduced. Therefore, the rotation detection device is reduced in weight, and the cost for manufacturing the rotation detection device can be reduced.

  The “rotary body” may be of any shape. Usually, a disc shape (disc shape) or an annular shape (donut shape) is applicable. The “rotation state” is a state relating to rotation, such as a rotation speed and a rotation angle, and includes a stop (rest). The “rotation detection unit” includes a sensor element and a signal processing component. The sensor element and the signal processing component may be integrally formed as long as signals can be transmitted, or may be formed separately. The sensor element is arbitrary as long as it is an element that detects the rotation of the rotating body. Usually, a magnetic sensor, a sound wave sensor, etc. correspond. Based on the signal detected by the sensor element, the signal processing component has a function of performing a process of outputting it as a rotation detection signal in a required signal format (for example, a pulse signal, a digital data signal, an analog signal, etc.). The “signal transmission member” is arbitrary as long as it is a member capable of transmitting a rotation detection signal. For example, a wire, an electric wire (including a shielded wire, the same applies hereinafter), an optical cable, and the like are applicable. As the “resin”, a resin of any material (including the meaning of the material; the same shall apply hereinafter) may be used as long as the internal structure can be integrally formed. The “external device” is arbitrary as long as it is a processing device capable of processing the rotation detection signal, and corresponds to, for example, an ECU or a computer. The “lead frame” may be any conductive member that is provided in the rotation detection unit and can be electrically connected, and may be of any shape, quantity, or material. Moreover, the form exposed to the surface of a rotation detection part is not restricted to the form which protrudes from a rotation detection part. It may be a lead wire, a connection pin, a terminal or the like which is a conductive member equivalent to the lead frame.

It is a front view which shows typically the structural example of a rotation detection apparatus. It is a figure explaining an example (part) of the manufacturing process of a rotation detection apparatus. It is a perspective view which shows typically the 1st structural example of a molded object. It is the front view, side view, and back view which show typically the 1st structural example of a molded object. It is a figure which shows the 1st structural example of a housing typically. It is a figure which shows an example of integral resin molding typically. It is a perspective view which shows typically the 1st structural example of a rotation detection apparatus. It is a side view which shows typically the 1st structural example of a rotation detection apparatus. It is sectional drawing of the IX-IX line shown in FIG. It is sectional drawing of the XX line shown in FIG. It is a figure which shows the 2nd structural example of a housing typically. It is a perspective view which shows typically the 2nd structural example of a rotation detection apparatus. It is a side view which shows typically the 2nd structural example of a rotation detection apparatus.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. Note that unless otherwise specified, “connecting” means electrically connecting. Each figure shows elements necessary for explaining the present invention, and does not necessarily show all actual elements. When referring to directions such as up, down, left and right, the description in the drawings is used as a reference.

[Embodiment 1]
The first embodiment will be described with reference to FIGS. First, FIG. 1 shows the appearance of the rotation detection device as viewed from the side. Moreover, the broken line part of a figure shows an internal structure. In addition to the signal transmission member 11, the internal structure 13, the rib 14, the fusion part 15, the hole (hole) 16, the rotation detection part 18, etc., the rotation detection apparatus 10 of the configuration example shown in FIG. A mounting portion 12 is provided. For convenience of explanation, the surface close to the sensor element 18b (see FIG. 2C) provided in the rotation detector 18 is referred to as “front”, and the surface facing the front and away from the sensor element 18b is “ It will be called the “back side”.

  The rotation detection device 10 shown in FIG. 1 includes a mounting portion 12 and is formed by a molding machine (molding) as will be described later. Any molding machine can be used as long as it can be integrally molded. For example, an injection molding machine or a compression molding machine is applicable. Below, each component of the rotation detection apparatus 10 is demonstrated.

  The signal transmission member 11 is a member that is electrically connected to the rotation detector 18 and transmits a rotation detection signal to the external device 50 (see FIGS. 7 and 8). The signal transmission member 11 of this embodiment is an example of an electric wire. Specifically, as shown in FIG. 2 and the like, the insulating covering members 11a and 11b, the conductive wires 11c, and the like are included. The covering member 11b covers the wire 11c in order to ensure insulation between the wires 11c. The shape of the wire 11c is arbitrary. The wire 11c of this embodiment is welded (for example, resistance welding or ultrasonic welding) after a plurality of fine wires (core wires) are twisted together in order to facilitate joining with the conductive member 17 (see FIG. 2). It is formed in a plate shape. The shape of the conductive member 17 is not limited as long as the lead frame 18a and the wire 11c can be connected. In this embodiment, as shown in FIG. 2 as an example, the plane is formed in a plate shape having a substantially “U” shape. The covering member 11a is formed in order to secure insulation from the outside and bundle the wires 11c covered with the covering member 11b. Although not shown, a shield wire may be interposed between the covering member 11b and the covering member 11a in order to suppress the influence on the rotation detection signal due to external noise or the like.

  The external device 50 is arbitrary as long as it can receive a rotation detection signal from the rotation detection unit 18 via the signal transmission member 11 or the like and process information related to rotation (for example, rotation speed, rotation angle, etc.). For example, an ECU, a computer, and the like are applicable, and the configuration and arrangement are arbitrary.

  The attachment portion 12 has a function of attaching the rotation detection device 10 itself to a body to be attached (for example, a frame, a chassis, a housing, a base frame, etc.), and includes a part of the internal structure 13 and a part of the signal transmission member 11. It is the site | part integrally molded so that one or both may be covered. The mounting portion 12 has recesses 12a and 12d, a bush 12b, and the like with respect to the mounting portion main body 12c. The concave portion 12a is a trace that is held by a holding member (not shown) when the internal structure 13 including the attachment portion 12 is integrally formed of resin. The bush 12b is a member (or part) provided with a hole (through hole / non-through hole) for fixing the rotation detection device 10 itself to the mounted body. The material of the bush 12b is arbitrary (for example, metal or resin), but in this embodiment, a metallic material is used. The concave portion 12d is also formed on the side surface of the signal transmission member 11 side (site away from the attachment portion 12).

  The internal structure 13 corresponds to a “main body” of the rotation detection device 10 and holds at least a part of the signal transmission member 11 and the rotation detection unit 18. The internal structure 13 is integrally formed of a resin including an exposed portion 11 d where the signal transmission member 11 is exposed to the outside and a non-exposed portion 11 e where the signal transmission member 11 is not exposed in a part of the internal structure 13. The The exposed portion 11d is provided within the formation range of the rib 14 in the axial direction of the internal structure 13 (vertical direction in FIG. 1). The non-exposed part 11e is a part (part) of the internal structure 13 excluding the exposed part 11d, and corresponds to the fusion part 15 and the bulging part 70 in the example of FIG. The fused portion 15, the hole 16, and the like are formed by integral molding. The exposed portion 11d is a trace that is held by the holding member (the holding member 32 shown in FIG. 6) when the internal structure 13 is integrally formed of resin.

  The material of the resin used for integral molding is arbitrary as long as it is insulative. For example, thermosetting resins (resins that cause polymerization to form a polymer network structure that cannot be restored by heating) or thermoplastic resins (soften by heating to the glass transition temperature or melting point, and then The resin that can be molded into the desired shape by cooling to 1) or more, among other resins. A plurality of types of resins having different materials may be mixed (mixed). Instead of (or in combination with) these resins, fiber reinforced plastics may be used. Examples of the fiber reinforced plastic include glass fiber reinforced plastic and carbon fiber reinforced plastic.

  The ribs 14 are plate-like portions (also referred to as end pieces) formed on the outer peripheral surface of the internal structure 13. Of the internal structure 13, a portion where the rib 14 is formed is referred to as a “rib forming portion 13 a”. Although the number of the ribs 14 is one or more and arbitrary, since the amount of resin increases as the number increases, it is practically several (several). The rib 14 has a function of regulating the posture of the rotation detection device 10 itself. When forming the plurality of ribs 14, the ribs 14 are formed in a substantially symmetrical shape with respect to the axis of the internal structure 13. “Substantially symmetric shape” includes not only symmetrical shapes but also asymmetric shapes within tolerances (eg, manufacturing tolerances). The internal structure 13 at the portion where the rib 14 is formed has the rib 14 and the exposed portion 11d alternately in the circumferential direction (see FIG. 9).

  The fusion part 15 is a part to be fused with the signal transmission member 11, and is formed on the side near the rotation detection part 18 among the parts where the ribs 14 are formed. The fusion means that the surface of the signal transmission member 11 (specifically, the covering member 11a) is melted by the heated and fluidized resin, and the signal transmission member 11 and the resin adhere to each other. The fused portion 15 corresponds to a “throttle portion” that seals and narrows the signal transmission member 11. The diaphragm portion will be described later (see FIG. 6).

  The hole 16 is formed in one or more ribs 14 when the plurality of ribs 14 are formed. That is, it may be formed on some of the plurality of ribs 14, or may be formed on all of the plurality of ribs 14. This hole 16 is a trace formed by the hole forming member 31 shown in FIG. 6 when the internal structure 13 is integrally formed of resin. The hole 16 may be a through hole or a non-through hole, and the shape of the hole, the number of holes, the position of the hole, etc. are not limited. In the present embodiment, two ribs 14 among the plurality of ribs 14 are formed, and formed on both sides of the fusion portion 15 on the side close to the rotation detection unit 18.

  The rotation detection unit 18 has a function of detecting the rotation state of the rotating body and transmitting (outputting) the rotation detection signal to the external device 50. A configuration example of the rotation detection unit 18 will be described later (see FIG. 2). The rotation detector 18 is accommodated in the housing 19. Part (or all) of the housing 19 is taken in and constitutes a tip end portion (lower end portion in FIG. 1) of the internal structure 13. In other words, the housing 19 is formed to be exposed from the distal end portion of the internal structure 13. A configuration example of the housing 19 will be described later (see FIG. 5).

  The rotation detection device 10 is positioned and attached to the attached body using one or more of the bushes 12b, the ribs 14 and the like described above. Not only the mounting but also fixing by fixing means may be performed. The fixing means corresponds to, for example, fastening using a fastening member such as a bolt or a screw, or bonding using an adhesive.

  A method for manufacturing the rotation detection device 10 configured as described above will be described with reference to FIGS. The manufacturing method in this embodiment includes a joining process, a molding process, and the like. Below, the specific example of each process is demonstrated.

[Jointing process]
The joining step is a step of joining the rotation detection unit 18 (specifically, the lead frame 18a) and the signal transmission member 11 (specifically, the wire 11c). In this embodiment, the connection is made by interposing the conductive member 17 between the lead frame 18a and the wire 11c. That is, as shown in FIG. 2A, the lead frame 18a, the wire 11c, and the conductive member 17 are brought into close contact with each other, and bonding is performed in the contact state. Joining includes welding and soldering. Since the purpose of joining is a connection that enables transmission of the rotation detection signal, a connection method other than joining may be used. For example, the connection which winds the lead frame 18a and the wire 11c with a conductive wire, the connection which caulks the conductive member 17 with respect to the lead frame 18a or the wire 11c, etc. correspond. In this embodiment, the conductive member 17 is interposed for connection, but the lead frame 18a and the wire 11c may be directly joined to perform connection. Instead of (or in combination with) the lead frame 18a, lead wires, connection pins, terminals, and the like may be provided.

  The state after joining is shown in a side view in FIG. 2B and in a front view (plan view) in FIG. FIG. 2C is a view of the lower side from the upper side of FIG. 2B and 2C show the joint portions 17a and 17b. The joint portion 17a is a portion where the lead frame 18a and the conductive member 17 are joined. The joint portion 17b is a portion where the conductive member 17 and the wire 11c are joined. Since the rotation detection unit 18 is lightweight, the state (posture) shown in FIGS. 2B and 2C can be maintained after joining.

  The rotation detection unit 18 includes a lead frame 18a, a sensor element 18b, a processing circuit body (not shown), and the like. The rotation detector 18 is sealed with resin and formed in a predetermined shape (for example, a rectangular parallelepiped). The lead frame 18a is a conductive member that transmits a rotation detection signal. The lead frame 18a may be any electrically conductive member that can be electrically connected, and may be in any position (including protruding surfaces and exposed surfaces), shape, quantity (number), material, and the like. In this embodiment, it is connected to the processing circuit body and is configured to protrude from the rotation detection unit 18. The sensor element 18b is a sensor that detects the rotation state of the rotating body. For example, a magnetic sensor is used for a rotating body including a magnetic encoder. The processing circuit body has a function of outputting a rotation detection signal based on the rotation state detected by the sensor element 18b. This processing circuit body corresponds to, for example, a circuit board having a semiconductor chip or a circuit component. The rotating body is arbitrary as long as it is a rotatable object. For example, in addition to the gear rotor 60 attached to the axle as shown by a two-dot chain line in FIG. 8, a magnetic rotor attached to a hub bearing or a magnetic encoder of a rotating electric machine (generator, electric motor, motor generator, etc.) To do.

  The rotation detector 18 shown in FIGS. 2 (A) and 2 (B) is inclined to facilitate housing in a housing 19 described later. When the structure of the housing 19 is different from that of FIG. 5 or when the housing 19 is integrally formed without being accommodated in the housing 19, the rotation detection unit 18 may be horizontal like the signal transmission member 11.

  Then, before performing integral molding by a molding machine in a molding process to be described later, preparations such as positioning of a member to be sealed and accommodation of the rotation detector 18 with respect to the housing 19 are performed. The former positioning is the positioning of the signal transmission member 11, the conductive member 17, and the rotation detection unit 18 in the state shown in FIGS. 2B and 2C. For this positioning, a holding member 32 is used as shown in FIG. The holding member 32 is composed of one or more holding members (including a mold). In the example shown in FIG. 6, all of the holding members 32 indicate the holding members 32 that hold the signal transmission member 11. Although not shown, there is also a holding member that holds the signal transmission member 11 and the like similarly to the holding member 32 and forms the recess 12a shown in FIG.

  As the hole forming member 31, the holding member 32, and the holding member that forms the recess 12 a (hereinafter also simply referred to as “holding member group”), members having arbitrary shapes may be used. In the example shown in FIG. 6, each mold body is held in contact with the signal transmission member 11 and the like using a holding member 32 constituted by four mold bodies. On the other hand, when using one holding member having a recess, the signal transmission member 11 and the like are fitted and held in the recess. In short, it is only necessary that the signal transmission member 11 and the like can be held as a whole holding member group as shown in FIG.

  FIGS. 5A and 5B are perspective views showing a configuration example of the housing 19 used for housing the rotation detection unit 18. The housing 19 shown in these drawings includes a housing portion 19a, a slope portion 19b, a detection surface portion 19c, and the like. The accommodating portion 19a is a concave portion that accommodates the rotation detecting portion 18 shown in FIG. The slope portion 19b is a slope portion formed to hold the rotation detection portion 18 of the molded body 40 (see FIGS. 3 and 4) described later together with the housing portion 19a. The detection surface portion 19c is a slope portion similar to the slope portion 19b and has a surface close to the sensor element 18b.

[Molding process]
The forming step is a step of forming the rotation detection device 10 including the internal structure 13 having the exposed portion 11d. In this embodiment, the first and second steps described later are used. Note that the first step may be omitted and only the second step may be performed.

  In the first step, a part of the signal transmission member 11, a part of the housing 19 in which the rotation detection unit 18 is accommodated, the conductive member 17 (including the joining parts 17 a and 17 b joined by the joining process described above) and the like are made of resin. It is the process of integrating. That is, it is performed in order to prevent the signal transmission member 11, the housing 19, the conductive member 17 and the like from being displaced or deformed by integral molding in the second step.

  3 and 4 show a configuration example of a molded body 40 molded by performing the first step. FIG. 4A shows a plan view (front view) seen from above in FIG. FIG. 4B shows a side view. FIG. 4C shows a plan view (back view) seen from below in FIG. The compact 40 shown in these figures has a through hole 40a. The through hole 40a is formed between the two conductive members 17 shown in FIG. 2 (C), and is filled with resin at the time of molding the holding member, thereby preventing contact between the conductive members 17 due to molding and providing insulation. Increase.

  The second step is a step of forming the internal structure 13 by integrally molding with resin including a part of the signal transmission member 11 and a part of the rotation detector 18 including the molded body 40 formed in the first step. It is. Specifically, the rotation detector 18 shown in FIG. 2C is covered with the housing 19, and the signal transmission member 11 and the like are held by the holding member 32 as shown in FIG. “Integrated resin molding” is performed by using a molten resin to form an integral molding. The molding machine has a mold. Below, the process of integrally resin-molding the internal structure 13 with a metal mold | die is demonstrated. The step includes a filling step of filling the molten resin into the mold.

[Filling process]
In the filling process, a part of the covering member 11a of the signal transmission member 11 is melted / softened, etc. (melting, softening, etc.), the melted part and the molten resin are fused, and a fusion part 15 for forming a fused portion. Below, each process is demonstrated easily.

[Melting / softening process]
In the melting / softening process or the like, the hole forming member 31 and the holding member 32 are arranged in a position of the mold cavity, for example, as shown in FIG. The hole forming member 31 is provided with a gap 80 between the signal transmitting member 11. The holding member 32 holds the signal transmission member 11 so as not to move during molding. When the molten resin is caused to flow in a predetermined direction (for example, the direction of arrow F in FIG. 6), it flows through the upstream portion 81 and the gap portion 80. The channel cross-sectional area of the gap 80 is smaller than the channel cross-sectional area of the portion that forms the bulging portion 70 (see FIG. 1) located in the upstream portion 81 of the gap 80. Therefore, the gap 80 functions as a “squeezing part”, and the flow rate and pressure of the molten resin are higher than those of the upstream part 81. The covering member 11a facing the gap 80 is melted or softened because it is heated to a temperature higher than the temperature of the covering member 11a facing the upstream portion 81 (corresponding to “another portion”).

[Fusion forming process]
In the fused part forming step, the molten resin is cooled to cure the molten resin. When the molten resin filled in the gap 80 is cured, it is formed as a fused portion 15. The upstream portion 81 adjacent to the fused portion 15 is formed as a bulging portion 70 when the filled molten resin is cured. In addition, the plurality of ribs 14 are formed. When the hole forming member 31 shown in FIG. 6 is removed after the molten resin is cured, the fused portion 15 and the hole 16 are formed, and when the holding member 32 is removed, the exposed portion 11d is formed. Sealing properties of the rotation detector 18 and the signal transmission member 11 can be ensured by the fusion of the molten resin and the adhesiveness of the resin. 1, 7 and 8 show the state after the integral resin molding is performed in this way.

  1, 7 and 8 show the appearance of the rotation detection device 10 manufactured by integral molding. FIG. 1 is as described above. FIG. 7 shows a perspective view seen from obliquely above in FIG. FIG. 8 shows a side view seen from the right side of FIG. 7 and 8, the illustration of the seal member shown in FIG. 1 (a part of the signal transmission member 11 indicated by a broken line, the rotation detection unit 18, the conductive member 17, etc.) is omitted. In practice, since the gear rotor 60 is provided substantially vertically, the rotation detection device 10 is attached with an inclination. Holes 16 are formed in the two ribs 14 by integral molding. The O-ring 20 shown in FIG. 1 is fitted into the recess 13b.

  Here, FIG. 9 shows a cross-sectional view taken along line IX-IX shown in FIG. 1, and FIG. 10 shows a cross-sectional view taken along line XX. The rib 14 shown in FIG. 9 is formed in a substantially symmetrical shape (that is, a cross shape) with respect to the axis of the internal structure 13. The inner side surface 14a applied to the plurality of (four in this embodiment) ribs 14 holds the outer peripheral surface of the signal transmission member 11 (that is, the covering member 11a).

  According to the first embodiment described above, the following effects can be obtained.

  (1) A rotation detection unit 18 that detects the rotation state of the rotating body and outputs a rotation detection signal; and a signal transmission member 11 that is electrically connected to the rotation detection unit 18 and transmits the rotation detection signal to the external device 50; And a rib forming portion 13a provided with a plurality of ribs 14 formed so as to be in contact with the outer peripheral surface of the signal transmission member 11 and extending radially outward, and holding the signal transmission member 11 and the rotation detection unit 18 integrally. A resin-molded internal structure 13, and the signal transmitting member 11 is exposed to the outside of the internal structure 13 in the rib forming portion 13 a within the range in which the plurality of ribs 14 are formed in the axial direction of the internal structure 13. It was set as the structure by which the at least 1 exposed part 11d to be provided was provided (refer FIG.1, FIG.7, FIG.8). According to this configuration, the plurality of ribs 14 formed to extend outward in the radial direction have not only a function of regulating the posture of the rotation detection device 10 itself, but also a function of the rib 14 itself holding the signal transmission member 11. Have both. Therefore, the signal transmission member 11 can be held at a desired position even when pressure is applied during integral molding. Since the ribs 14 are formed in a plate shape, the amount of resin required for integral molding of the internal structure 13 can be reduced. Therefore, the rotation detection device 10 is reduced in weight, and the cost for manufacturing the rotation detection device 10 can be reduced.

  (2) The signal transmission member 11 is configured to be held by the inner side surfaces 14a of the plurality of ribs 14 (see FIGS. 9 and 10). According to this configuration, since a separate member for holding the signal transmission member 11 is not required, the rotation detection device 10 is reduced in weight, and the cost for manufacturing the rotation detection device 10 can be further reduced.

(3) The rib forming portion 13a is provided with a non-exposed portion 11e that is not exposed when the signal transmission member 11 is covered with resin, and the non-exposed portion 11e is at least one exposed portion in the axial direction of the internal structure 13. It was set as the structure adjacent to 11d (refer FIG. 1, FIG. 7-FIG. 9, FIG. 12, FIG. 13). According to this structure, the non-exposed part 11e can seal the signal transmission member 11 with resin by integral molding.

  (4) In the case where a plurality of exposed portions 11d are provided, the rib forming portion 13a has a configuration in which a plurality of ribs 14 and a plurality of exposed portions 11d are alternately provided in the circumferential direction (FIG. 1, FIG. 9). According to this configuration, in the exposed portion 11d, a resin used for integral molding is not required by the difference between the outer dimension of the rib 14 and the outer dimension of the exposed portion 11d. Therefore, in addition to the effect of holding the signal transmission member 11 at a desired position, the rotation detection device 10 is reduced in weight, and the cost for manufacturing the rotation detection device 10 can be further reduced.

  (5) The plurality of ribs 14 are configured to be substantially symmetrical with respect to the axis of the internal structure 13 (see FIGS. 9 and 10). According to this configuration, the rib 14 is formed in a substantially symmetrical shape, so that the signal transmission member 11 can be held by the axis of the internal structure 13.

  (6) At least one of the plurality of ribs 14 is provided with a hole 16 (see FIGS. 1, 7, and 10). According to this structure, compared with the case where the hole 16 is not formed, the amount of resin required for formation can be reduced. Therefore, the cost for manufacturing the rotation detection device 10 can be further reduced.

  (7) The hole 16 provided in at least one of the plurality of ribs 14 is positioned closer to the rotation detection unit 18 than the at least one exposed portion 11d in the axial direction of the internal structure 13, and in the radial direction Between the hole 16 provided in at least one of the plurality of ribs 14 and the outer peripheral surface of the signal transmission member 11, a fused portion 15 that is fused to the outer peripheral surface of the signal transmission member 11 is formed as a rib. It was set as the structure integrally provided in the part 13a (refer FIG.1, FIG.7, FIG.8). According to this configuration, since the fused portion 15 is fused to the outer peripheral surface of the signal transmission member 11, the internal structure 13 can securely hold the signal transmission member 11.

  (8) In the axial direction of the internal structure 13, a bulging portion 70 bulging radially outward from the end portion of the fusion portion 15 is provided between at least one exposed portion 11 d and the fusion portion 15. The length in the radial direction from the outer peripheral surface of the signal transmission member 11 to the outer peripheral surface of the bulging portion 70 is provided integrally with the rib forming portion 13a and extends from the outer peripheral surface of the signal transmission member 11 to the outer peripheral surface of the fused portion 15. It was set as the structure larger than the length of radial direction (refer FIG.1, FIG.6, FIG.10). According to this structure, the fusion | fusion part 15 which hold | maintains the signal transmission member 11 reliably, and the rib 14 which controls the attitude | position of rotation detection apparatus 10 itself can be shape | molded simultaneously.

  (9) It has the structure which has the attaching part 12 which attaches rotation detection apparatus 10 itself (refer FIG.1, FIG.7, FIG.8). According to this configuration, the rotation detection device 10 can be easily attached to an attached body (for example, a frame or the like).

  (10) The mounting portion 12 is integrally formed so as to cover at least one of a part of the internal structure 13 and a part of the signal transmission member 11 (see FIGS. 1, 7, and 8). reference). According to this configuration, the target shape can be easily formed.

  (11) In the manufacturing method of the rotation detection device 10, a joining step for joining the plurality of lead frames 18 a of the rotation detection unit 18 and the signal transmission member 11, and a formation range of the plurality of ribs 14 in the axial direction of the internal structure 13 And a molding step of integrally molding the internal structure 13 having the rib forming portion 13a provided with at least one exposed portion 11d for exposing the signal transmission member 11 to the outside of the internal structure 13. (See FIGS. 4-8). According to this configuration, the internal structure 13 including the exposed portion 11d is integrally resin-molded by the molding process. A plurality of ribs 14 formed to extend outward in the radial direction hold the signal transmission member 11. Therefore, the signal transmission member 11 can be held at a desired position even when pressure is applied during integral resin molding. Since the rib 14 is formed in a plate shape, the amount of resin required for integral resin molding of the internal structure 13 can be reduced. Therefore, the rotation detection device 10 is reduced in weight, and the cost for manufacturing the rotation detection device 10 can be reduced.

  (12) The forming process includes forming the hole 16 in at least one of the plurality of ribs 14 (see FIGS. 1, 7, and 8). According to this structure, compared with the case where the hole 16 is not formed, the amount of resin required for formation can be reduced. Therefore, the cost for manufacturing the rotation detection device 10 can be further reduced.

  (13) In the molding step, the mounting portion 12 of the rotation detection device 10 is formed by integrally molding so as to cover at least one of the part of the internal structure 13 and the part of the signal transmission member 11. (See FIGS. 1, 7, and 8). According to this configuration, the rotation detection device 10 can be easily attached to the attached body.

  (14) The molding step includes a filling step for filling the mold for molding the internal structure 13 with a molten resin, and the filling step is a covering member that forms the outer peripheral surface of the signal transmission member 11 in the die. 11a and a cavity 80 between the mold 16 forming a hole 16 in at least one of the plurality of ribs 14, and located on the upstream side of the cavity 80, from the cavity 80 Also, the molten resin is allowed to flow from the upstream portion 81 having a large channel cross-sectional area, and the portion of the covering member 11a exposed to the gap portion 80 is higher than another portion of the covering member 11a adjacent to the gap portion 80 in the upstream portion 81. The portion of the covering member 11a exposed to the gap 80 is heated or melted or softened, and the portion of the covering member 11a exposed to the gap 80 is melted or softened to the gap 80. Filled molten resin Fusing an outer peripheral surface of the signal transmission member 11 (especially covering member 11a), and configured to and forming a fused portion 15 in the rib forming portion 13a (see FIG. 6). According to this configuration, the sealing performance of the rotation detection unit 18 and the signal transmission member 11 can be ensured by the fusion with the molten resin and the adhesiveness of the resin.

[Other Embodiments]
Although the form for implementing this invention was demonstrated above, this invention is not limited to the said form at all. In other words, various forms can be implemented without departing from the scope of the present invention. For example, the following forms may be realized.

  In the above-described embodiment, the through hole 40a is formed in the molded body 40 (see FIGS. 3 and 4). However, the through hole 40a is formed when the molded body 40 has sufficient strength and insulation. It is good also as a structure which does not form. The molded body 40 is formed by integral molding in the second step, and the purpose is to prevent misalignment or deformation of the signal transmission member 11, the housing 19, the conductive member 17, and the like. The shape may be different. 3 and 4, a part of the conductive member 17 is exposed, but a configuration in which the entire conductive member 17 is not exposed may be employed. The wire 11c and the lead frame 18a are the same as in the case of the conductive member 17, and a part of the wire 11c and the lead frame 18a may be exposed or may not be exposed. Since the configuration of the molded body 40 is only the difference, the same effect as the above-described embodiment can be obtained.

  In the above-described embodiment, the housing 19 has a flat slope portion 19b (see FIG. 5). Instead of this form, as shown in FIGS. 11 (A) and 11 (B), the slope 19b may further have a protrusion 19d (a convex piece, an end piece, etc.). Since the projection 19d corresponds to the tip of the rotation detection device 10, the position, orientation, etc. of the tip can be regulated. That is, when the internal structure is molded, the direction of the molded body 40 fitted to the housing 19 can be defined, or the surface on which the sensor element 18b after molding can be clarified. When the molding process is performed using the housing 19 shown in FIG. 11, the rotation detection device 10 shown in FIGS. 12 and 13 can be manufactured. 12 is a perspective view similar to FIG. 7, and FIG. 13 is a side view similar to FIG. Except for the above-described effects, the configuration is the same as that of the above-described embodiment, so that the same effects as those of the above-described embodiment can be obtained.

  In the embodiment described above, the sensor element 18b is provided in the rotation detection unit 18 (see FIG. 2). Instead of this form, the sensor element 18b may be provided separately from the rotation detection unit 18. In this case, a signal line (including the lead frame 18a) for transmitting a signal detected by the sensor element 18b to the rotation detection unit 18 (particularly the processing circuit body) is required. Further, in the molding process, it is necessary to form the molded body 40 by integrally molding the sensor element 18b together with a part of the signal transmission member 11, the conductive member 17, and the rotation detection unit 18 with resin. Since only the difference between the sensor element 18b and the rotation detection unit 18 being integrated or separate is obtained, the same operational effects as those of the above-described embodiment can be obtained.

  In the embodiment described above, the attachment portion 12 is configured to extend along the direction in which the pair of ribs 14 are formed (see FIGS. 1, 7, and 8). Instead of this form, it may be configured to extend in a direction unrelated to the formation direction of the ribs 14. Depending on the position of the body to be attached, it may be formed to extend with an angle θ (0 ° <θ <180 °). In any configuration, since only the configuration of the attachment portion 12 is different, the same effects as those of the above-described embodiment can be obtained.

DESCRIPTION OF SYMBOLS 10 Rotation detection apparatus 11 Signal transmission member 11d Exposed part 11e Non-exposed part 12 Attachment part 13 Internal structure 13a Rib formation part 14 Rib 14a Inner side surface 15 Fusion part 16 Hole 18 Rotation detection part 18a Lead frame (conductive member)
50 External device 60 Gear rotor (rotary body)
70 bulge

Claims (14)

A rotation detector (18) for detecting a rotation state of the rotating body and outputting a rotation detection signal;
A signal transmission member (11) that is electrically connected to the rotation detection unit and transmits the rotation detection signal to an external device (50);
It has a rib forming part (13a) provided with a plurality of ribs (14) formed in contact with the outer peripheral surface of the signal transmission member and extending radially outward, and holds the signal transmission member and the rotation detection part. And an internal structure (13) molded integrally with resin,
Within the formation range of the plurality of ribs in the axial direction of the internal structure, the rib forming portion is provided with at least one exposed portion (11d) that exposes the signal transmission member to the outside of the internal structure. A rotation detection device (10) characterized by comprising:   The rotation detection device according to claim 1, wherein the signal transmission member is held by an inner surface (14 a) of the plurality of ribs. The rib forming portion is provided with a non-exposed portion (11e) where the signal transmission member is covered with resin and is not exposed,
The rotation detection device according to claim 1, wherein the non-exposed part is adjacent to the at least one exposed part in an axial direction of the internal structure.   4. The structure according to claim 1, wherein, in the case where a plurality of the exposed portions are provided, the rib forming portion is provided with the plurality of ribs and the plurality of exposed portions alternately in a circumferential direction. The rotation detection device according to any one of claims.   5. The rotation detection device according to claim 1, wherein the plurality of ribs are provided substantially symmetrically with respect to an axis of the internal structure.   The rotation detection device according to any one of claims 1 to 5, wherein a hole (16) is provided in at least one of the plurality of ribs. The hole provided in at least one of the plurality of ribs is positioned closer to the rotation detection unit than the at least one exposed portion in the axial direction of the internal structure.
In the radial direction, a fusion welded to the outer peripheral surface of the signal transmission member between the hole provided in at least one of the plurality of ribs and the outer peripheral surface of the signal transmission member The rotation detecting device according to claim 6, wherein the portion (15) is provided integrally with the rib forming portion. In the axial direction of the internal structure, a bulging portion (70) bulging radially outward from an end portion of the fusion portion is provided between the at least one exposed portion and the fusion portion. Provided integrally with the rib forming part,
The radial length from the outer peripheral surface of the signal transmission member to the outer peripheral surface of the bulging portion is larger than the radial length from the outer peripheral surface of the signal transmission member to the outer peripheral surface of the fused portion. The rotation detection device according to claim 7.   The rotation detection device according to any one of claims 1 to 8, further comprising a mounting portion (12) to which the rotation detection device itself is attached.   The rotation detection device according to claim 9, wherein the attachment portion is integrally formed so as to cover at least one of a part of the internal structure and a part of the signal transmission member. A rotation detector (18) that detects a rotation state of the rotating body and outputs a rotation detection signal, and a signal transmission member that is electrically connected to the rotation detector and transmits the rotation detection signal to the external device (50). (11), and a rib forming portion (13a) provided with a plurality of ribs (14) formed so as to be in contact with the outer peripheral surface of the signal transmission member and extend radially outward. In the method of manufacturing the rotation detection device (10) including the internal structure (13) that holds the rotation detection unit,
A bonding step of bonding the plurality of lead frames (18a) of the rotation detection unit and the signal transmission member;
The rib forming portion provided with at least one exposed portion (11d) for exposing the signal transmission member to the outside of the internal structure within a range where the plurality of ribs are formed in the axial direction of the internal structure. A method of manufacturing a rotation detecting device, comprising: a molding step of integrally molding the internal structure.   The method of manufacturing a rotation detecting device according to claim 11, wherein the forming step includes forming a hole (16) in at least one of the plurality of ribs.   In the molding step, the mounting portion (12) of the rotation detection device is formed by integrally molding so as to cover at least one of a part of the internal structure and a part of the signal transmission member. The method for manufacturing a rotation detecting device according to claim 11, wherein the rotation detecting device is included. The molding step has a filling step of filling a molten resin into a mold for molding the internal structure,
The filling step includes
In the mold, a covering member (11a) that forms the outer peripheral surface of the signal transmission member, and a hole forming member (31) of the mold that forms a hole in at least one of the plurality of ribs The molten resin is allowed to flow from an upstream portion (81) that is located upstream of the gap portion and has a larger channel cross-sectional area than the gap portion, and is exposed to the gap portion. The portion of the covering member is heated to a temperature higher than that of another portion of the covering member adjacent to the gap portion in the upstream portion, and the portion of the covering member exposed to the gap portion is melted or softened. And letting
The rib forming portion is formed by fusing the molten resin filled in the gap and the outer peripheral surface of the signal transmission member to the melted or softened portion of the covering member exposed in the gap. The method for manufacturing a rotation detecting device according to claim 11, further comprising forming a fusion part (15).

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