JP2009098047A - Lead terminal connecting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lead terminal connecting structure having high reliability in electric connection and capable of improving work efficiency in solder bonding between a lead terminal and an electric lead. <P>SOLUTION: The lead terminal connecting structure comprises: a detecting element; a case for containing a detecting element; the lead terminal 42 with a part exposed from the case while being electrically connected to the detecting element; a wall part surrounding the lead terminal 42; an electric lead 46 bonded to the lead terminal 42 through solder; and a filling member filled in the recessed part formed by the wall part, and built-in with the bonding part of the lead terminal 42 with the electric lead 46. A U-shaped bonding part 42a connected to the electric lead 46 is arranged at the lead terminal 42, and the opening 42b of the bonding part 42a is arranged in the lateral direction with respect to the exposure direction of the lead terminal 42. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a connection structure between a lead terminal electrically connected to a detection element and an electric lead made of a conductive material such as copper.

A conventional lead terminal connection structure is used in a rotation detection device or the like. The rotation detection device includes a detection element, a case that houses the detection element, and a lead terminal that is electrically connected to the detection element. And a resin molding that covers the joint portion between the lead terminal and the electrical lead after electrically joining the lead terminal and the electrical lead. The part was formed (for example, refer to Patent Document 1).
Japanese Unexamined Patent Publication No. 07-140159

  In the conventional lead terminal connection structure, the lead terminal is provided with a joint portion in which the end portion of the electric lead bites into the lead terminal, and the electric lead is pressed against the lead terminal from above and pushed. Temporarily fixed to the joint, and fixed by soldering. In such a connection structure, in order to prevent the electric lead from being lifted upward, the electric lead must be surely pushed into the joint portion of the lead terminal, and the assembly work is complicated.

  In recent years, due to cost reduction, a wall portion surrounding the lead terminal is provided in the case instead of a resin molding portion covering the joint portion between the lead terminal and the electric lead, and a recess formed by the wall portion. Some of them are filled with a filling member that covers a joint portion between the lead terminal and the electric lead. By providing this wall portion, there is a problem that the lead terminal is positioned in the concave portion, and it becomes difficult to push the electric lead into the joint portion of the lead terminal.

  Accordingly, an object of the present invention is to provide a lead terminal connection structure that is highly reliable in electrical connection and can improve workability at the time of solder joining between a lead terminal and an electrical lead. .

  The present invention includes a detection element, a case that houses the detection element, a lead terminal that is electrically connected to the detection element and is partially exposed from the case, and a wall that surrounds the lead terminal, In a lead terminal connection structure comprising: an electrical lead joined to the lead terminal by solder; and a filling member filled in a recess formed in the wall portion and incorporating a joint portion between the lead terminal and the electrical lead. In addition, a U-shaped joint portion to be joined to the electrical lead is provided in the lead terminal, and an opening of the joint portion is provided in a direction transverse to the exposure direction of the lead terminal.

  In the present invention, an elastic member for holding the electric lead is provided in an opening provided in the wall portion.

  ADVANTAGE OF THE INVENTION According to this invention, the lead terminal connection structure which can achieve the intended objective, has high reliability of electrical connection, and can improve the workability at the time of solder joining of a lead terminal and an electrical lead is provided. be able to.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the present embodiment, the present invention will be described using the rotation detection device R.

  The rotation detection device R of the present embodiment includes a lower case 1, a rotary shaft 2 rotatably supported by the lower case 1, a magnet 3 fixed to one end of the rotary shaft 2, and the same material as the lower case 1. An upper case 4, a circuit board 5 mounted on the upper case 4 and mounted with electronic components such as a resistor and a capacitor, and a detection element 6 made of a Hall IC, MR element, etc. disposed on the circuit board 5. And a gear 7 that is rotationally coupled to an output shaft (for example, a transmission gear) of a transmission (not shown) and that is attached to the other end of the rotary shaft 2.

  The lower case 1 has a cylindrical shape made of a thermoplastic resin such as polybutylene terephthalate (PBT), and the upper case 4 is fixed to the upper side of the lower case 1. The lower case 1 and the upper case 4 constitute a case. The lower case 1 is formed with a storage portion 14 formed of a recess for storing the magnet 3. Moreover, the cylindrical rotary bearing 15 which has a through-hole penetrated from the storage part 14 to the lower end part of the lower case 1 and is made of a metal material (for example, aluminum) is insert-molded. A mounting piece 17 in which a collar 16 made of a metal material such as brass is insert-molded is formed, and a mounting groove in which an O-ring (to be described later) is disposed on the entire periphery of the lower case 1 below the mounting piece 17. 18 is formed.

  The rotary shaft 2 is made of an iron-based material (for example, SUM24L) and is rotatably supported by the rotary bearing 15. The rotary shaft 2 is provided with an insertion portion 21 having a tip having a small diameter for mounting the gear 7. Further, the rotary shaft 2 is provided with a notch portion 22 in order to prevent the gear 7 and the rotary shaft 2 from slipping.

  The magnet 3 is composed of a multi-pole magnetized plastic magnet or the like.

  The upper case 4 is made of the same material as the lower case 1, and includes a lid body 41, a lead terminal 42 that is insert-molded in the upper case, and a wall portion 43 that is provided integrally with the lid body 41 and surrounds the lead terminal 42. Yes. In addition, 46 is an electrical lead electrically connected to the lead terminal 42, 47 is a filling member made of a synthetic resin filled in a recess 48 formed by the wall 43, and 49 is a wall The grommet is formed of an elastic member that is provided in the opening 50 formed in the portion 43 and holds the electric lead 46.

  The lid 41 of the lower case 1 is formed with a storage portion 44 that stores the circuit board 5. Further, a flange portion 45 protruding outward is formed on the outer periphery of the lid body 41.

  The lead terminal 42 is made of metal and outputs a signal (speed signal) from the detection element 6 according to the rotation of the magnet 3 to the outside. Both ends of the lead terminal 42 are exposed from the lid body 41, one end is exposed in the storage portion 44, and is electrically connected to the circuit board 5, and the other end is exposed in the recess 48. 46 and solder S are electrically connected. The electrical connection portion between the lead terminal 42 and the circuit board 5 is protected by being embedded in the filling member 1B filled in the storage portion 44, and the lead terminal 42 and the electrical lead 46 are protected. The electrical connection portion is protected by being incorporated in a filling member 47 filled in the recess 48.

  Further, a portion of the lead terminal 42 exposed from the concave portion 48 of the case 4 is provided with a joint portion 42a formed of a U-shaped recess to be joined to the electric lead 46, and the opening 42b of the joint portion 42a has a lead 42b. The terminal 46 is provided laterally with respect to the exposure direction. In FIG. 4, the opening 42b is open on the left side. Further, the joint portion 42a is provided with a recess 42c in the central portion of the lead terminal 42 in the exposure direction of the lead terminal 42, that is, in the upward direction in FIG.

  The electrical lead 46 is composed of a core made of a metal having low resistance such as copper and a coating made of an insulating material such as a synthetic resin covering the core. The lead terminal 42 is electrically connected to a core that is not covered with a coating.

  The filling member 47 is a synthetic resin that is cured by heat or the like.

  The grommet 49 is made of an elastic member such as rubber and includes a groove 49a in which the opening 50 is fitted. Then, the opening 50 is fitted into the groove 49 a so as to be assembled to the opening 50 of the wall 43. The opening 50 is formed so that the open portion is narrow, so that the grommet 49 does not come off the opening 50.

  The circuit board 5 is a double-sided mounting board made of a synthetic resin material such as a glass epoxy resin, and a wiring pattern and connection lands (not shown) are formed at predetermined locations on the circuit board 5, and a Hall IC or MR is formed on the connection lands. A detection element 6 composed of an element or the like and a surface mount component such as a resistor or a capacitor (not shown) are mounted by reflow soldering.

  The circuit board 5 is formed with a through-hole through which the end of the lead terminal 42 passes, and the lead terminal 42 is electrically connected to the periphery of the through-hole (on the mounting surface side of the detection element 6) by solder S1. A connection land (not shown) for this purpose is formed. Further, a filling hole 55 for filling the filling member 1 </ b> B is formed in the circuit board 5 at substantially the center of the circuit board 5.

  The gear 7 is made of a synthetic resin and includes a plurality of teeth 71. The gear 7 meshes (rotates) with a gear tooth body of an output shaft (not shown).

  The thrust spring 8 is made of an iron-based elastic material, and is inserted through the insertion portion 21 of the rotary shaft 2 as shown in FIG. The thrust spring 8 urges a holding member 81 such as a C ring fixed to the insertion portion 21 of the rotating shaft 2 to hold the gear 7 and prevent the magnet 3 from vibrating.

  With the above configuration, the rotation detection device R is configured. When the output shaft of the transmission rotates, the gear 7, the rotation shaft 2, and the magnet 3 are rotated, and the magnetic poles magnetized on the upper surface 3 a of the magnet 3. This change is detected by the detection element 6 and the detected rotation signal is taken out to the outside through a lead terminal 42 and an electric lead 46 provided by being insert-molded in the upper case 4.

  Next, a method for assembling the rotation detection device R will be described.

  In the circuit board 5, the magnetic detection surface of the detection element 6 faces the magnetized surface of the magnet 3 (the upper surface 3 a of the magnet 3), and one end of the lead terminal 42 penetrates the through hole of the circuit board 5. After being arranged in the housing portion 44 of the upper case 4 and connecting the lead terminal 42 and the connection land of the circuit board 5 with the solder S1, the epoxy is put into the housing portion 44 of the upper case 4 from the filling hole 55 of the circuit board 5. The circuit board 5 in which the detection element 6 is mounted on the upper case 4 is disposed and fixed by filling the filling member 1 </ b> B.

  Then, an O-ring 1C made of an elastic material such as rubber is disposed on the second step portion 12 of the upper case 4, and then the upper case 4 is disposed on the lower case 1, so that the circuit board 5 is mounted. The detection surface of the detection element 6 and the upper surface (magnetization surface) 3a of the magnet 3 attached to the rotating shaft 2 are arranged to face each other. Then, the lower case 1 and the upper case 4 are fixed by heat-caulking the entire circumference of the open part of the lower case 1 located around the flange portion 45 of the upper case 4. An O-ring 1D is attached to the mounting groove 18 of the lower case 1 in order to prevent oil leakage, dust, dust, and the like from entering the transmission housing.

  Next, the grommet 49 holding the electrical lead 46 is assembled to the opening 50 of the wall 43 of the upper case 4. Next, the lead of the electrical lead 46 is introduced into the joint portion 42a of the lead terminal 46 in the lateral direction of the lead terminal 46, that is, in the direction perpendicular to the exposed direction of the lead terminal 46 (the arrow direction in FIG. 4). 46 is located in the joint 42 a of the lead terminal 42. At this time, when the height of the electrical lead 46 held by the grommet 49 is higher than the height of the joint portion 42a, the electrical lead 46 has an upward force applied to the joint portion 42a of the lead terminal 42, The electric lead 46 is changed from the center state to the right side state among the three lead terminals 42 in FIG. 4, and is held in a state where it hits the upper side of the joint portion 42 a of the lead terminal 42. Further, since the recess 42c is provided, the electric lead 46 enters the recess 42c and is stably held. In this state, the lead terminal 42 and the electrical lead 46 are connected by the solder S. Then, the filling member 47 is filled in the recess 48 and cured, and the rotation detecting device R is completed.

  With the configuration described above, a lead terminal connection structure that can prevent the electric lead 46 from being lifted and can improve the workability at the time of solder S bonding between the lead terminal 42 and the electric lead 46 is provided. can do.

Sectional drawing of the rotation detection sensor of 1st Embodiment of this invention. The top view of the rotation detection sensor of the embodiment. The side view seen from the arrow A direction in FIG. The side view of the lead terminal seen from the arrow B direction in FIG.

Explanation of symbols

1 Lower case
4 Upper case (case)
6 detection element 42 lead terminal 42a joint part 42b joint part 42c dent 43 wall part 46 electric lead 47 filling member 48 concave part 49 grommet (elastic member)
50 Openings S, S1 Solder

Claims (2)

A detection element; a case that houses the detection element; a lead terminal that is electrically connected to the detection element and partially exposed from the case; a wall that surrounds the lead terminal; and the lead terminal; In the lead terminal connecting structure, comprising: an electrical lead joined by solder; and a filling member filled in a concave portion formed by the wall portion and incorporating a joint portion between the lead terminal and the electrical lead. A lead terminal connection structure characterized in that a U-shaped joint portion to be joined to the lead terminal is provided in the lead terminal, and an opening of the joint portion is provided in a direction transverse to the exposure direction of the lead terminal. The lead terminal connection structure according to claim 1, wherein an elastic member for holding the electric lead is provided in an opening provided in the wall portion.

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