JP2017084740A - Power conversion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power conversion device that can reduce force to be applied between a flange portion of a nut and a resin.SOLUTION: A DCDC converter includes a first substrate, a second substrate, and a base member. A terminal board 30 is provided to the base member. The terminal board 30 includes a resin 31, a flange nut 41, a cap 51, and a bus bar 61. The flange portion 43 of the flange nut 41 is covered with the resin 31. The bus bar 61 is plate-shaped, has a circular first insertion hole 62 at one end portion thereof, and has a circular second insertion hole 63 at the other end portion opposite to the one end portion. In addition, the bus bar 61 has a plate-like conductive portion 64 between the first insertion hole 62 and the second insertion hole 63.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a power conversion device.

  The power converter is provided with a terminal block. As this type of terminal block, a terminal block in which a part of a nut is embedded in a resin is known. In Patent Document 1, a flange nut is used as the nut, and the flange nut is prevented from coming off by using the flange portion.

JP-A-8-303439

  By the way, a bus bar may be used to fasten the terminal of the board constituting the power converter and the terminal of the connected member to the nut of the terminal block with screws. A screw hole corresponding to the screw hole of the terminal of the board and a screw hole of the nut is formed at one end of the bus bar, and a screw hole corresponding to the terminal of the connected member is formed at the other end of the bus bar. Accordingly, screw holes having different diameters are formed at both ends of the bus bar. Generally, the fastening force increases as the diameter of the screw increases. Of the screw holes at both ends of the bus bar, after the screw hole with the smaller diameter is fastened with the screw with the smaller diameter, the screw hole with the larger diameter is fastened with the screw with the larger diameter, A large force is applied between the flange portion and the resin by the fastening force.

  The objective of this invention is providing the power converter device which can reduce the force added between the flange part of a nut, and resin.

  A power conversion device that solves the above problems includes a substrate including a terminal plate having a first screw insertion hole, a base member to which the substrate is fixed, a flange portion covered with resin, and one end surface of which is the resin. And a terminal block fixed to the base member, wherein the terminal block is in plate contact with the one end surface and in contact with the resin. A bus bar, the bus bar having a second screw insertion hole corresponding to the screw hole of the nut and a third screw insertion hole having a diameter larger than the diameter of the second screw insertion hole; A plate-like conductive portion is formed between the second screw insertion hole and the third screw insertion hole, and the first screw insertion hole, the second screw insertion hole, and the screw hole of the nut Is inserted through the first screw, the terminal board, The bus bar and the nut are fixed to each other, and a second screw is inserted into the screw hole of the terminal provided in the third screw insertion hole and the connected member, and the bus bar, The terminals provided on the connected member are fixed to each other, and the extending direction of the surface in the width direction of the conductive portion is the extending direction of the one end surface and the extending direction of the contact surface of the terminal with the bus bar. Is different.

  When the connected member is fastened to the bus bar of the terminal block, the second screw is inserted through the third screw insertion hole of the bus bar and the screw hole of the terminal provided in the connected member. Here, since the diameter of the 2nd screw which penetrates the 3rd screw penetration hole is larger than the diameter of the 1st screw which penetrates the 2nd screw penetration hole, the diameter of the 1st screw and the 2nd screw Stress is applied between the flange portion and the resin in the axial direction of the nut due to the difference from the diameter of the nut. At this time, the conductive portion of the bus bar is deformed in the thickness direction, so that the extending direction of the surface in the width direction of the conductive portion is the extending direction of the one end surface of the terminal block and the contact surface of the connected member with the bus bar. The direction is different from the extending direction. Due to the deformation of the conductive portion of the bus bar, the force applied between the flange portion and the resin in the axial direction of the nut can be reduced.

About the said power converter device, the said resin may have the chip accumulation space connected to the screw hole of the said nut.
According to this, chips can be collected in the space, and the chips can be prevented from coming out of the space.

About the said power converter device, the said bus-bar may have a protrusion part which protrudes to a radial direction outer side with respect to the center axis | shaft of a said 1st screw penetration hole in the part which contacts the said resin.
A power conversion device that solves the above problems includes a substrate including a terminal plate having a first screw insertion hole, a base member to which the substrate is fixed, a flange portion covered with resin, and one end surface of which is the resin. And a terminal block fixed to the base member, wherein the terminal block is in plate contact with the one end surface and in contact with the resin. A bus bar, the bus bar having a second screw insertion hole corresponding to the screw hole of the nut and a third screw insertion hole having a diameter larger than the diameter of the second screw insertion hole; A plate-like conductive portion is formed between the second screw insertion hole and the third screw insertion hole, and the first screw insertion hole, the second screw insertion hole, and the screw hole of the nut Is inserted through the screw, the terminal board, the bus Chromatography, and, and summarized in that the nut is secured to one another.

  When the member to be connected is fastened to the bus bar of the terminal block, a screw that is inserted through the third screw insertion hole of the bus bar is screwed into the member to be connected and screwed. Here, since the diameter of the screw inserted through the third screw insertion hole is larger than the diameter of the screw inserted through the second screw insertion hole, the difference between the screw diameters causes the flange portion in the axial direction of the nut. Stress is applied between the resin. At this time, the conductive portion of the bus bar is plastically deformed in the thickness direction, and the force applied between the flange portion and the resin in the axial direction of the nut can be reduced.

  According to the present invention, the force applied between the flange portion of the nut and the resin can be reduced.

The perspective view which decomposes | disassembles and shows a part of DCDC converter. The perspective view which shows the output terminal of a DCDC converter. The perspective view which shows the input terminal of a DCDC converter. The perspective view of a terminal block. Sectional drawing of a terminal block. (A) is a perspective view of a bus bar, (b) is a top view of a bus bar. Sectional drawing which shows the terminal block before screwing a terminal to the other end part of a bus-bar. Sectional drawing which shows the terminal block of the state which screwed the terminal to the other end part of the bus-bar.

Hereinafter, an embodiment of the power conversion device will be described.
As shown in FIG. 1, a DCDC converter 10 as a power conversion device includes a first substrate 11, a second substrate 12, and a base member 13. The first substrate 11 and the second substrate 12 are connected by a connector (not shown). The DCDC converter 10 of the present embodiment steps down the electric power input from the high voltage battery and outputs it to the low voltage battery.

  As shown in FIG.1 and FIG.2, the base member 13 is substantially square plate shape, and the 1st board | substrate 11 is mounted in one surface. The first substrate 11 is a power substrate including electronic components such as a power element (not shown). The first substrate 11 includes a terminal plate 14 that outputs the reduced voltage to the low-voltage battery. The terminal plate 14 has an elongated plate shape, and a circular terminal hole 15 is provided at the tip. The terminal board 14 is an output terminal of the DCDC converter 10.

  On one surface of the base member 13, a plurality of support pillars 16 that support the second substrate 12 are erected. The second substrate 12 is fixed to the base member 13 via the support column 16 by screwing a bolt 17 inserted through the second substrate 12 into the support column 16. The second board 12 is a control board provided with electronic components such as a control element (not shown). The second substrate 12 includes two terminal plates 18 to which power from the high voltage battery is input.

  As shown in FIGS. 1 and 3, each terminal plate 18 has an elongated plate shape, and its tip protrudes from the edge of the second substrate 12. A circular terminal hole 19 is provided at the tip of each terminal plate 18. Each terminal board 18 is an input terminal of the DCDC converter 10.

  In the present embodiment, the first substrate 11 and the second substrate 12 function as substrates that are fixed to the base member 13. Moreover, in this embodiment, the terminal hole 19 provided in each terminal board 18 is functioning as a 1st screw penetration hole. Each terminal plate 18 is fixed to a terminal block 30 provided on the base member 13. Hereinafter, the terminal block 30 will be described in detail.

  On one surface of the base member 13, a fixed column 20 having a shorter dimension in the standing direction than the support column 16 is erected. A terminal block 30 is fixed to the fixed column 20. The terminal block 30 is provided to face each terminal plate 18 of the second substrate 12.

  As shown in FIGS. 4 and 5, the terminal block 30 includes a resin 31, a flange nut 41, a cap 51, and a bus bar 61. The resin 31 has a fixed portion 32 fixed to the fixed column 20 with the bolts 21 and two protruding portions 33. The fixed portion 32 and the protruding portion 33 are integrally formed and are made of the same resin. The fixing part 32 and the projecting part 33 are made of resin, so that insulation from the base member 13 is achieved.

  Each protrusion 33 is columnar and extends toward each terminal board 18. The distance between the centers of the protrusions 33 is the same as the distance between the centers of the terminal holes 19 of the terminal plates 18. The flange nut 41, the cap 51, and the bus bar 61 are molded in the resin 31 by insert molding.

  The flange nut 41 as a nut has a hexagonal nut portion 42 having a screw hole 42 a and a flange portion 43 formed integrally with the nut portion 42. One end side of the flange nut 41 is provided so as to face each terminal plate 18. The flange portion 43 is covered with the resin 31.

  A resin cap 51 is attached to the first end surface 44 of the flange nut 41. The cap 51 has a bottomed cylindrical shape and has a recess 52 that is recessed toward the bottom. The cap 51 is attached to the first end face 44 of the flange nut 41 in a state where the recess 52 and the screw hole 42a of the flange nut 41 are connected. The cap 51 is provided so as to cover the periphery of the screw hole 42a, and the resin is molded in a state in which one opening of the screw hole 42a is closed by the cap 51, thereby preventing the resin from entering the screw hole 42a. The The recess 52 is located between the first end surface 44 and the protrusion 33.

  As shown in FIGS. 5, 6 (a), and 6 (b), the second end face 45 that is one end face of the flange nut 41 is exposed from the resin 31. A metal (for example, copper) bus bar 61 is disposed on the second end surface 45 of the flange nut 41, and the bus bar 61 is in surface contact with the second end surface 45. The bus bar 61 is plate-shaped, has a circular first insertion hole 62 at one end, and has a circular second insertion hole 63 at the other end opposite to the one end. The bus bar 61 includes a plate-like conductive portion 64 between the first insertion hole 62 and the second insertion hole 63. A plurality of protruding portions 65 protrude from the edge of one end portion of the bus bar 61. The plurality of projecting portions 65 project radially outward with respect to the central axis of the first insertion hole 62. The first insertion hole 62 corresponds to the screw hole 42 a and has a diameter equal to or larger than the diameter of the screw hole 42 a of the flange nut 41. The diameter d2 of the second insertion hole 63 is larger than the diameter d1 of the first insertion hole 62. In the present embodiment, the first insertion hole 62 functions as a second screw insertion hole, and the second insertion hole 63 functions as a third screw insertion hole.

  The bus bar 61 is disposed so that the first insertion hole 62 and the screw hole 42a of the flange nut 41 communicate with each other. One surface of the bus bar 61 is in surface contact with the second end surface 45 of the flange nut 41, and a surface that contacts the flange nut 41 at one end of the bus bar 61 is a contact surface 66. The bus bar 61 is embedded in the resin 31 in a state where the other surface, which is the surface opposite to the contact surface 66, is exposed from the resin 31, and the surface around the first insertion hole 62 on this surface is the resin 31. Is exposed from. Further, the peripheral edge of one end of the bus bar 61 is in contact with the resin 31, and the protrusion 65 provided at the peripheral edge of the one end is embedded in the resin 31.

  In the present embodiment, a terminal portion 67 is constituted by the flange nut 41 and the resin 31, and each terminal plate 18 is connected to the terminal portion 67. That is, each terminal plate 18 of the DCDC converter 10 has one end of the bus bar 61 formed by screwing the terminal hole 19 and the first screw S1 as a screw inserted through the first insertion hole 62 into the flange nut 41. It is being fixed to the terminal block 30 in the state which contacted the part. In other words, the terminal plate 18, the bus bar 61, and the flange nut 41 are fixed to each other by the terminal hole 19, the first insertion hole 62, and the first screw S <b> 1 inserted through the screw hole 42 a of the flange nut 41. The central axes of the first insertion hole 62 and the terminal hole 19 are concentric, and the radial direction of the first insertion hole 62 and the radial direction of the terminal hole 19 coincide.

  As shown in FIG. 8, a terminal 71 of a high voltage battery as a connected member is connected to the other end portion of the bus bar 61. A screw hole 73 is provided in a terminal 71 provided in the high voltage battery. In a state where the other end of the bus bar 61 is overlapped with the terminal 71, the second screw S2 is inserted into the second insertion hole 63 of the bus bar 61 and the screw hole 73 of the terminal 71 provided in the high voltage battery. . The second screw S2 is fastened to the fastening portion 72, and the bus bar 61 and the terminal 71 of the high voltage battery are fixed to each other by the second screw S2. In the following description, a surface that contacts the bus bar 61 of the terminal 71 is referred to as a contact surface 74.

  The bus bar 61 has a step in the width direction across the conductive portion 64. That is, one end portion and the other end portion of the bus bar 61 located at different positions in the width direction are connected by the conductive portion 64. The surface in the width direction of the conductive portion 64 extends between one end portion and the other end portion of the bus bar 61, and the direction D1 in which the surface in the width direction of the conductive portion 64 extends is the direction D2 in which the second end surface 45 extends. And the direction D3 in which the contact surface 74 extends is different. In the present embodiment, the width direction surface of the bus bar 61 is a surface in which the first insertion hole 62 and the second insertion hole 63 are opened. In addition, the direction D1 in which the surface of the conductive portion 64 extends, the direction D2 in which the second end surface 45 extends, and the direction D3 in which the contact surface 74 extends include the first insertion hole 62 and the second insertion hole 63. In a plan view. The direction in which the second end surface 45 extends and the direction in which the contact surface 74 extends are the same direction.

Next, the operation of the DCDC converter 10 of this embodiment will be described.
As shown in FIG. 7, when connecting the DCDC converter 10 and the high voltage battery, a terminal 71 of the high voltage battery is connected to the other end of each bus bar 61. When the terminal 71 of the high voltage battery is connected to the other end portion of the bus bar 61, the terminal 71 of the high voltage battery is arranged so as to overlap the other end portion of the bus bar 61 (around the second insertion hole 63). At this time, a gap δ is generated between the terminal 71 of the high voltage battery and the other end portion of the bus bar 61 due to the influence of tolerance or the like. The bus bar 61 before being fixed to the terminal 71 by the second screw S2 is flat, and the extending direction of the surface in the width direction of the conductive portion 64 is the extending direction of the second end surface 45, and This is the same as the direction in which the contact surface 74 extends.

  As shown in FIG. 8, when the second screw S2 inserted through the second insertion hole 63 is screwed into the fastening portion 72 and screwed, the other end of the bus bar 61 is driven by the axial force from the second screw S2. Is pulled toward the fastening portion 72 as indicated by F1 in the figure.

  When the diameter of the second screw S2 is larger than that of the first screw S1, the force (axial force) applied to the bus bar 61 from the second screw S2 and the force (axial force) applied to the bus bar 61 from the first screw S1 Due to this difference, a large force is applied to the terminal portion 67. Specifically, when the force applied to the bus bar 61 from the second screw S2 is large, the other end of the bus bar 61 is pulled toward the fastening portion 72, and the contact portion between the second screw S2 and the bus bar 61 is reduced. The contact point between the force point P1 and the bus bar 61 and the end portion of the protruding portion 33 is the action point P2, and a force F2 is applied to try to lift one end portion of the bus bar 61 from the flange nut 41. The force F <b> 2 that the flange nut 41 tries to lift is applied to the projecting portion 33 from the flange portion 43 along the axial direction of the nut portion 42, and a stress is generated between the projecting portion 33 and the flange portion 43. The diameter of the first screw S1 is, for example, 4.5 mm, and the diameter of the second screw S2 is, for example, 6.0 mm.

  In the present embodiment, the strength of the conductive portion 64 is weaker than the strength of the terminal portion 67. Here, the strength is resistance to deformation when a force is applied in the thickness direction of the bus bar 61, and when a force is applied in the thickness direction of the bus bar 61, the conductive portion 64 is ahead of the terminal portion 67. Deforms in the thickness direction.

  Specifically, the force that the flange nut 41 tries to lift by embedding the flange portion 43 of the flange nut 41 in the projecting portion 33 is applied to the projecting portion 33 via the flange portion 43. For this reason, the strength of the terminal portion 67 is made stronger than that of the conductive portion 64 by adjusting the type and thickness of the resin of the protruding portion 33. For this reason, when a strong force is applied in the thickness direction of the bus bar 61, the conductive portion 64 is deformed (specifically, plastic deformation), whereby the force applied to the terminal portion 67 is reduced. That is, the force applied between the protruding portion 33 and the flange portion 43 is reduced. Note that a low voltage battery is connected to the terminal plate 14.

  Further, when the first screw S1 is screwed to the flange nut 41, chips are generated. The chips accumulate in the recess 52 and are prevented from coming out of the recess 52. That is, the recess 52 provided in the cap 51 functions as a chip accumulation space. The recess 52 is provided in the resin 31, and it can be said that the resin 31 has the recess 52. Furthermore, since the nut portion 42 is hexagonal, the flange nut 41 can be prevented from rotating when the first screw S1 is screwed.

Therefore, according to the above embodiment, the following effects can be obtained.
(1) The flange nut 41 is provided such that the flange portion 43 is embedded in the protruding portion 33. Further, the extending direction D1 of the surface in the width direction of the conductive portion 64 is different from the extending direction D2 of the second end surface 45 and the extending direction D3 of the contact surface 74. In other words, the conductive portion 64 is deformed when the other end portion of the bus bar 61 is fastened to the fastening portion 72. And the force added between the flange part 43 of the flange nut 41 and the protrusion part 33 can be reduced by the deformation | transformation of the electroconductive part 64. FIG.

  (2) By providing the cap 51 on the first end surface 44 of the flange nut 41, the chip accumulation space is defined by the recess 52 of the cap 51. Accordingly, it is possible to prevent the chips from adhering to the DCDC converter 10 or the like from hindering the operation of the DCDC converter 10 or the like.

  (3) Using the flange portion 43 of the flange nut 41, the flange nut 41 is prevented from coming off from the protruding portion 33. That is, it is possible to prevent the flange nut 41 from coming off from the protruding portion 33 using the flange nut 41 which is a general-purpose product.

  (4) Since the protrusion 65 is embedded in the resin 31, when the second screw S <b> 2 inserted through the second insertion hole 63 is screwed into the fastening portion 72 and screwed, the bus bar 61 is connected to the resin 31. Hard to come off.

In addition, you may change embodiment as follows.
In the embodiment, the terminal block 30 is provided corresponding to the terminal plate 18, but a terminal block having the same structure may be further provided corresponding to the terminal plate 14. Further, the terminal block 30 may be provided corresponding to only the terminal plate 14. That is, the terminal block 30 may be provided corresponding to at least one of the terminal plate 14 and the terminal plate 18.

○ The cap 51 may not be provided. In other words, the chip accumulation space may not be provided.
-An inverter may be sufficient as a power converter device.

  -The protrusion part 65 does not need to be provided.

  DESCRIPTION OF SYMBOLS S1 ... 1st screw, S2 ... 2nd screw, 10 ... DCDC converter, 11 ... 1st board | substrate, 12 ... 2nd board | substrate, 13 ... Base member, 14, 18 ... Terminal board, 15, 19 ... Terminal Hole: 30 ... Terminal block, 31 ... Resin, 41 ... Flange nut, 42 ... Nut, 42a ... Screw hole, 43 ... Flange, 44 ... First end face, 45 ... Second end face, 52 ... Recess, 61 ... Bus bar, 62 ... first insertion hole, 63 ... second insertion hole, 64 ... conductive portion, 65 ... projection portion, 66 ... contact surface.

Claims (4)

A substrate including a terminal board in which a first screw insertion hole is formed;
A base member to which the substrate is fixed;
A power conversion device comprising: a terminal block fixed to the base member, the flange portion being covered with resin and having a nut with one end surface exposed from the resin,
The terminal block includes a plate-like bus bar that is in surface contact with the one end surface and is in contact with the resin.
The bus bar has a second screw insertion hole corresponding to the screw hole of the nut and a third screw insertion hole having a diameter larger than the diameter of the second screw insertion hole, and the second screw insertion hole. A plate-like conductive part is formed between the hole and the third screw insertion hole,
The first screw is inserted into the first screw insertion hole, the second screw insertion hole, and the screw hole of the nut, and the terminal plate, the bus bar, and the nut are fixed to each other,
A second screw is inserted into the screw hole of the terminal provided in the third screw insertion hole and the connected member, and the bus bar and the terminal provided in the connected member are fixed to each other. ,
The direction in which the surface in the width direction of the conductive portion extends is different from the direction in which the one end surface extends and the direction in which the contact surface of the terminal provided on the connected member extends with the bus bar. Conversion device.   The power conversion device according to claim 1, wherein the resin has a chip accumulation space connected to a screw hole of the nut.   3. The electric power according to claim 1, wherein the bus bar has a protruding portion protruding radially outward with respect to a central axis of the first screw insertion hole at a portion in contact with the resin. Conversion device. A substrate including a terminal board in which a first screw insertion hole is formed;
A base member to which the substrate is fixed;
A power conversion device comprising: a terminal block fixed to the base member, the flange portion being covered with resin and having a nut with one end surface exposed from the resin,
The terminal block includes a plate-like bus bar that is in surface contact with the one end surface and is in contact with the resin.
The bus bar has a second screw insertion hole corresponding to the screw hole of the nut and a third screw insertion hole having a diameter larger than the diameter of the second screw insertion hole, and the second screw insertion hole. A plate-like conductive part is formed between the hole and the third screw insertion hole,
A screw is inserted through the first screw insertion hole, the second screw insertion hole, and the screw hole of the nut, and the terminal plate, the bus bar, and the nut are fixed to each other. Power conversion device.

Images