JP5491883B2 - Connection terminal mounting structure - Google Patents

Description

  The present invention relates to a connection terminal mounting structure that is press-fitted into an insulating support member provided integrally with a stator core and is electrically connected to an end of a stator coil.

  For example, Patent Document 1 discloses a technique relating to a press-fit fixed contact that prevents buckling and deformation in the vicinity of a portion where the contact is press-fitted into a circuit board or the like and fixed. According to the press-fit fixed contact of Patent Document 1, a boundary region between a wide portion that applies a pressing force at the time of press-fitting and a fixed portion that is positioned in the vicinity thereof and is fixed to a circuit board or the like is formed in the thickness direction of the contact. Bending and deformation in the thickness direction of the contact are suppressed by forming a U-shape that is resistant to bending stress and reinforcing the boundary region with a resin block. Thereby, when a contact is press-fitted and fixed to a circuit board or the like, buckling or deformation generated in the contact can be suppressed.

  Further, in Patent Document 2, for example, as a structure in which a dummy terminal is attached to an electromagnetic relay, the dummy terminal is inserted into a slit formed in a ceiling surface of the housing of the electromagnetic relay, and the locking is provided protruding from the side wall of the housing. A technique for locking the locking holes of the locking arm portions formed at both ends of the dummy terminal to the protrusions for use is disclosed.

  According to the attachment structure of Patent Document 2, since the dummy terminal is attached to the ceiling surface of the housing to the full width of the ceiling surface, the area where the housing supports the dummy terminal is increased, and the support strength of the dummy terminal is increased. Becomes larger. As a result, rattling of the dummy terminals is less likely to occur. In addition, the positioning accuracy of the dummy terminal is improved by locking the locking hole to the locking protrusion.

Japanese Patent Laid-Open No. 5-114427 Japanese Patent Laid-Open No. 10-275645

  As an example of the one similar to the above-described press-fit fixed contact, there is a connection terminal that is electrically connected to an end portion of a stator coil of a motor. This connection terminal is press-fitted into an insulating support member provided integrally with the stator core on the upper surface of the stator core around which the stator coil is wound.

  When the connection terminal is press-fitted into the insulating support member, the connection terminal is inclined with respect to the insulating support member or shifted from a predetermined position while the insulating support member is expanded in the width direction. May have bitten in a bad state (incomplete press-fit state). In such a case, it is necessary to correct the connection terminal in a poorly press-fitted state so that it does not tilt with respect to the insulating support member or does not deviate from a predetermined position.

  Furthermore, for example, when the above-mentioned connection terminal is housed in the electric tool, vibration is generated during use of the electric tool, and this vibration is transmitted to the insulating support member and force is continuously applied to the connection terminal. It is conceivable that the press-fitted state of the connection terminal with respect to the insulating support member is loosened, and rattling of the connection terminal occurs.

  The present invention has been proposed in view of such a situation, and it is possible to suppress the insulating support member from expanding, to suppress biting into the insulating support member in a poorly press-fitted state, and Another object of the present invention is to provide a connection terminal mounting structure capable of preventing the occurrence of rattling after press-fitting into an insulating support member.

According to a first aspect of the present invention, there is provided a connection terminal mounting structure in which an insulating support member is integrally provided with an upper surface of a stator core around which the stator coil is wound, and the stator coil is press-fitted into the insulating support member. In the mounting structure of the plate-like connection terminal that is electrically connected to the end of the insulating support member and protrudes upward, the connection terminal protrudes from both ends in the width direction in the thickness direction of the connection terminal. A pair of arm portions each having an inverted L-shape, each tip of which is bent downward in the connection terminal, and in the press-fit state in which the connection terminal is press-fitted into the insulating support member. The arm portion is locked to the outer surface of the insulating support member on the projecting side of the arm portion, and restricts the expansion of the insulating support member in the width direction, and the arm portion of the insulating support member In front of the protruding side Characterized in that a contact with the locking portion to the arm portion from the center side in the width direction of the insulating support member.

According to a second aspect of the present invention, in the first aspect , the arm portion is inclined to be brought into a contact position with the locking portion as the connection terminal is press-fitted into the insulating support member. A surface is provided.

According to the connection terminal mounting structure according to the first aspect of the invention, when the connection terminal is press-fitted into the insulating support member, the connection terminal attempts to expand the insulating support member in the width direction. Even if it exists, a pair of arm part latches on the outer surface of the said insulating support member, and by restrict | limiting the expansion to the width direction of this insulating support member, this pair of arm part is insulated by the connection terminal. The force applied to the sexual support member can be counteracted. Thereby, when the connection terminal is press-fitted into the insulating support member, the insulating support member can be prevented from expanding in the width direction.
In addition, when the connection terminal is press-fitted into the insulating support member, the pair of arm portions are guided to the outer surface so that the connection terminal does not tilt with respect to the insulating support member. It can be corrected so that it does not deviate from the position. Thereby, the state which press-fits with respect to an insulating support member can be maintained, suppressing that a connection terminal inclines or shift | deviates from a predetermined position (press-fit failure state).
Further, in the press-fitted state, the pair of arm portions are locked to the outer surface of the insulating support member, so that the connection terminal can be fixed to the insulating support member via the pair of arm portions. As a result, for example, even when vibration is applied to the insulating support member and force is applied to the connection terminal, the press-fitted state is maintained, and rattling of the connection terminal can be prevented.
According to the first aspect of the present invention, in the press-fitted state, the connection terminal can be fixed to the outer surface of the insulating support member in a state where the pair of arm portions are in contact with the locking portion from the thickness direction. Thereby, even when an external force in the thickness direction is accidentally applied to the connection terminal, the pair of arm portions are in contact with the outer surface (locking portion) of the insulating support member from the thickness direction. By being maintained, it is possible to prevent the connection terminal from moving in the thickness direction.
According to the invention of claim 2 , when the connection terminal is press-fitted into the insulating support member, the pair of arms move along the inclined surface, so that the connection terminal is moved to the insulating support member. It can be smoothly advanced in the press-fitting direction. Thereby, it is possible to easily press-fit the connection terminal into the insulating support member.

It is a schematic perspective view of the stator of the embodiment of the present invention. It is explanatory drawing of the method of press-fitting a coil terminal in the stator. (A) is a front view of the coil terminal, (b) is a rear view of the coil terminal, and (c) is a side view of the coil terminal.

  An embodiment of the present invention will be described with reference to FIGS. The stator 1 shown in FIGS. 1 and 2 includes a stator core 10, a stator coil 15, an end plate 20, and a coil terminal 30.

  The stator core 10 is formed into a substantially cylindrical shape by assembling the left and right halved laminates 10A and 10B. Two engaging grooves 11 and 11 are formed on the outer circumference of each of the half-laminate laminates 10A and 10B in the longitudinal direction thereof. As will be described later, the engaging claws 21 of the end plate 20 are locked in the engaging grooves 11, 11.

  The stator coil 15 includes a first stator coil 15A and a second stator coil 15B. The first and second stator coils 15A and 15B are wound around the stator cores 10A and 10B. The first stator coil 15A is fixed to the inner surface of the half-slice laminate 10A, and the second stator coil 15B is fixed to the inner surface of the half-slice laminate 10B. The first stator coil 15 </ b> A and the second stator coil 15 </ b> B are arranged so as to be symmetric with respect to the axial center of the stator core 10.

  A rotor (not shown) supported by a rotating shaft (not shown) arranged in the same direction as the axial direction of the central axis of the stator core 10 is accommodated in the stator core 10.

  The end plate 20 is fixed to the upper end surface 12 of the stator core 10 and integrated with the stator core 10. Each end plate 20 is formed of an insulating material (synthetic resin). Each end plate 20 is provided with engagement claws 21 and 21 and a contact piece 22. The engaging claws 21 and 21 are provided at positions corresponding to the respective engaging grooves 11 and 11. The contact piece 22 protrudes downward from the lower surface of the end plate 20 so as to be sandwiched between the engagement claws 21 and 21. In a state where each end plate 20 is fixed to the upper end surface 12, the engagement claws 21, 21 are engaged with the engagement grooves 11, 11, and the contact piece 22 contacts the upper end surface 12. Touch. The upper end surface 12 is an example of the upper surface of the stator core of the present invention.

  Terminal support portions 25 are provided upright at both ends of each end plate 20. The terminal support portion 25 is formed of a synthetic resin in the same manner as the end plates 20. A coil terminal 30 is press-fitted into each terminal support portion 25 so as to protrude upward from the terminal support portion 25. As shown in FIG. 2, each terminal support portion 25 has guide grooves 26, 26, coil terminal fitting holes 27, and guide ribs 28, 28.

  The guide grooves 26, 26 protrude from the back surface of each terminal support portion 25 along the longitudinal direction of each terminal support portion 25. The coil terminal fitting hole 27 is a bottomed hole projecting from the lower back of each terminal support portion 25. The guide grooves 26, 26 are extended to the bottom surface of the coil terminal fitting hole 27.

  The guide ribs 28, 28 protrude from the front surface of each terminal support portion 25 along the longitudinal direction of each terminal support portion 25. On the upper end portions of the guide ribs 28, 28, inclined surfaces 28A, 28A having a predetermined downward slope are formed. Each inclined surface 28A is inclined outward from the center side in the width direction of the terminal support portion 25, and the inclined surfaces 28A, 28A are symmetrical with respect to the direction in which the coil terminal 30 is press-fitted into the terminal support portion 25. It is formed to become. As will be described later, the tips of the arm portions 32 of the coil terminal 30 are movably contacted with the inclined surfaces 28A and 28A. Reference numeral 28B in FIGS. 1 and 2 denotes an outer vertical surface of the guide rib 28 extending downward from the lower edge of each inclined surface 28A. Each terminal support portion 25 is an example of an insulating support member of the present invention.

  The coil terminal 30 is formed using a metal plate, and as shown in FIGS. 3A to 3C, the press-fitting piece 31, a pair of arm portions 32 and 32, and a protrusion for preventing removal. 33 and 33 and a coil connection piece 34.

  The press-fitting piece 31 has a vertically long plate shape. The pair of arm portions 32 and 32 are extended so as to protrude in the thickness direction of the press-fit piece 31 from both side surfaces in the width direction of the press-fit piece 31 in a state of being parallel to each other. The tip of each arm portion 32 is bent downward in the press-fitting piece 31. Thereby, each arm part 32 has comprised reverse L shape. The protruding position of the pair of arm portions 32, 32 is near the center in the vertical direction of the press-fitting piece 31. In the present embodiment, as will be described later, in a state where the coil terminal 30 (press-fit piece 31) is press-fitted into the terminal support portion 25, the pair of arm portions 32 and 32 regulates the expansion of the terminal support portion 25 in the width direction. To do.

  The escape preventing projections 33 are formed at the lower end of the press-fitting piece 31. As shown in FIG. 3A, the value of the maximum width dimension W <b> 1 of the removal preventing projection 33 is larger than the value of the maximum width dimension W <b> 2 of the press-fit piece 31. As will be described later, in the state where the coil terminal 30 is press-fitted into the terminal support portion 25, the protrusions 33 and 33 for preventing the removal bite into the side walls of the guide grooves 26 and 26 described above. Thereby, the coil terminal 30 is prevented from coming off from the terminal support portion 25.

  The coil connecting piece 34 is bent from the bottom surface of the press-fitting piece 31 and extends upwardly from the press-fitting piece 31. As will be described later, the coil connection piece 34 is fitted into the coil terminal fitting hole 27. Both ends of each of the stator coils 15A and 15B are sandwiched between the inner surface of the coil connection piece 34 of each coil terminal 30 and the back surface of the press-fitting piece 31, and are soldered to the coil connection pieces 34, respectively. Electrically connected. Each stator coil 15 </ b> A, 15 </ b> B is connected to a power source via a coil terminal 30. Thereby, it becomes possible to energize each stator coil 15A, 15B. The coil terminal 30 is an example of the connection terminal of the present invention.

  Next, a method for press-fitting and positioning the coil terminal 30 in the terminal support portion 25 will be described. As shown in FIG. 2, the coil terminal 30 is press-fitted from above the terminal support portion 25 toward the coil terminal fitting hole 27 so that the protrusion 33 for preventing removal is along the side walls of the guide grooves 26 and 26. . At that time, the distal ends of the pair of arm portions 32, 32 move along the downward inclination of the inclined surfaces 28A, 28A. Thus, the coil terminal 30 can be corrected so that the coil terminal 30 does not tilt with respect to the terminal support part 25 or does not deviate from a predetermined position, and the coil terminal 30 is pressed into the terminal support part 25 (coil terminal fitting). Smooth advancement in the direction in which the hole 27 is located) can be assisted.

  Thereafter, the coil connection piece 34 is tightly fitted into the coil terminal fitting hole 27 at a position where it abuts against the bottom surface of the coil terminal fitting hole 27. By the time the coil connection piece 34 abuts against the coil terminal fitting hole 27, the protrusion prevention protrusions 33 and 33 (see the respective drawings in FIG. 3) bite into the guide grooves 26 and 26, and the terminal support portion 25 is moved to the Expands in the width direction.

  In the present embodiment, when the coil connection piece 34 is fitted in the coil terminal fitting hole 27 (hereinafter referred to as a press-fit state), as shown in FIG. The outer vertical surfaces 28B and 28B abut from the center side of the terminal support portion 25 in the width direction. In this state, the pair of arm portions 32 and 32 are locked to the outer surface on the front side of the terminal support portion 25 from the thickness direction of the press-fitting piece 31. As a result, the pair of arm portions 32, 32 resists the force that the protrusion preventing projections 33, 33 push the terminal support portion 25 in the width direction, and restricts the terminal support portion 25 from expanding in the width direction. To do. The outer surface on the front side of the terminal support portion 25 is an example of the outer surface on the projecting side of the arm portion in the insulating support member of the present invention, and the guide rib 28 is an example of the locking portion of the present invention.

  In addition, as described above, the pair of arm portions 32 and 32 are locked to the outer surface from the thickness direction, so that the coil terminal 30 is fixed in a state where the coil terminal 30 does not rattle the terminal support portion 25. . It should be noted that the position where the pair of arm portions 32, 32 are in contact with the outer vertical surfaces 28B, 28B in the press-fitted state is an example of the contact position with the locking portion of the present invention.

<Effect of this embodiment>
In the present embodiment, as described above, when the coil terminal 30 is press-fitted and positioned in the terminal support portion 25, the pair of arm portions 32, 32 are connected to the terminal support portion 25 by the protrusions 33, 33 for preventing removal. The terminal support portion 25 is restricted from spreading in the width direction against the force that expands in the width direction. For this reason, when the coil terminal 30 is press-fitted into the terminal support portion 25, the pair of arm portions 32 and 32 can prevent the terminal support portion 25 from expanding in the width direction.

  In addition, as described above, the coil terminal 30 is press-fitted into the terminal support portion 25 so that the pair of arm portions 32 and 32 are engaged with the outer surface on the front side of the terminal support portion 25. For this reason, when the coil terminal 30 is press-fitted into the terminal support portion 25, as described above, the tips of the pair of arm portions 32, 32 move along the outer surface (downward inclination of the inclined surfaces 28A, 28A). By doing so, it is possible to correct the coil terminal 30 so that it does not tilt with respect to the terminal support portion 25 or does not deviate from a predetermined position. Thereby, it is possible to maintain the press-fitting state while suppressing the coil terminal 30 from being inclined or displaced from a predetermined position (press-fitting poor state) with respect to the terminal support portion 25.

  When the stator 1 is housed in an electric tool, vibration may occur during use of the electric tool, and the vibration may be transmitted to the terminal support portion 25 to continuously apply force to the coil terminal 30. . Even in such a case, in the press-fitted state, as described above, the coil terminal 30 is fixed in a state in which the terminal does not rattle against the terminal support portion 25, so that force is applied to the coil terminal 30. However, it is possible to prevent the coil terminal 30 from rattling by maintaining the press-fitted state.

  Further, in the press-fitted state, as described above, the pair of arm portions 32 and 32 are engaged with the outer surface on the front side of the terminal support portion 25 from the thickness direction in a state of being in contact with the outer vertical surfaces 28B and 28B. Is done. Thereby, the coil terminal 30 is fixed in a state in which it does not rattle the terminal support portion 25. For this reason, even when the external force in the thickness direction is accidentally applied to the coil terminal 30, the pair of arm portions 32, 32 are in contact with the outer vertical surfaces 28B, 28B from the thickness direction. By being maintained, the coil terminal 30 can be prevented from moving in the thickness direction.

  Furthermore, when the coil terminal 30 is press-fitted and positioned in the terminal support portion 25, as described above, the tips of the pair of arm portions 32 and 32 move along the downward inclination of the inclined surfaces 28A and 28A. Thus, the coil terminal 30 assists the smooth advancement in the direction in which the coil terminal 30 is press-fitted into the terminal support portion 25 (the direction in which the coil terminal fitting hole 27 is located). Thereby, the coil terminal 30 can be easily press-fitted into the terminal support portion 25.

  The present invention is not limited to the above-described embodiment, and can be implemented by appropriately changing a part of the configuration without departing from the spirit of the invention. For example, unlike the above-described embodiment, the pair of arm portions may protrude in the width direction from both side surfaces in the width direction of the press-fitting piece 31 to have the above-described inverted L shape. Accordingly, the pair of arm portions are locked to both side surfaces in the width direction of the terminal support portion 25, and the protrusions 33 and 33 for preventing the withdrawal are opposed to the force that pushes and expands the terminal support portion 25 in the width direction, The terminal support portion 25 can be restricted from spreading in the width direction.

  In the above-described embodiment, the pair of arm portions 32 and 32 are extended so as to protrude from the press-fit piece 31 integrally with the press-fit piece 31, but the present invention is not limited thereto. For example, the pair of arm portions may be formed separately from the press-fitting piece 31 and then fixed to the press-fitting piece 31 by welding or the like and protruded in the thickness direction or the width direction of the press-fitting piece 31.

  Further, in the above-described embodiment, the pair of arm portions 32 and 32 are locked to the outer surface on the front side of the terminal support portion 25 in a state where the arm portions 32 and 32 are in contact with the outer vertical surfaces 28B and 28B. . For example, a concave groove extending in the longitudinal direction is formed in the guide rib 28, and the pair of arm portions 32, 32 are locked to the outer surface in a state where the pair of arm portions 32, 32 are press-fitted into the concave groove. Also good.

  1 .. Stator, 10 .. Stator core, 10 A, 10 B .. Half-laminate laminate, 12 .. Upper end surface of stator core, 15 .. Stator coil, 25 .. Terminal support, 28 .. Guide rib, 28 A. Inclined surface, 30 ... coil terminal, 32 ... arm part of coil terminal

Claims (2)

An insulating support member is provided integrally with the stator core on the upper surface of the stator core around which the stator coil is wound. The insulating support member is press-fitted into the insulating support member and is electrically connected to the end of the stator coil. In the mounting structure of the plate-like connection terminal protruding upward of the member,
The connection terminal has a pair of arms that project in the thickness direction of the connection terminal from both ends in the width direction and have inverted L-shapes in which each tip is bent downward in the connection terminal,
In the press-fitted state in which the connection terminal is press-fitted into the insulating support member, the pair of arm portions are engaged with an outer surface of the insulating support member on the projecting side of the arm portion, and the insulating support member to restrict the spread in the width direction,
A locking portion that contacts the arm portion from the center side in the width direction of the insulating support member in the press-fitted state is provided on the outer surface of the insulating support member on the projecting side of the arm portion. Connection terminal mounting structure. Claim 1, with the locking portion, characterized in that said arm portion with the press-fitting the connecting terminals to said insulating support member provided with the inclined surface for guiding the contact position between the locking portion The connection terminal mounting structure described in 1.

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