JP2019030191A - Control device - Google Patents

Abstract

To disclose an example of a structure capable of stably fixing a bus bar.SOLUTION: A bus bar 6 is mechanically fixed to an electrode 4 by a first fastener 5 and a second fastener 7. The electrode 4 is fixed to a base 2 by the first fastener 5. By fixing the electrode 4 to the base 2 by the first fastener 5, the electrode 4 is also fixed to a substrate 3 by the first fastener 5. The bus bar 6 and the base 2 are prevented from being short-circuited via the first fastener 5. As a result, it is possible to prevent the electrode 4 and the base 2 from being indirectly short-circuited via the bus bar 6.SELECTED DRAWING: Figure 1

Description

  The present application relates to a control device that controls an electric device mounted on an industrial vehicle.

  For example, in the invention described in Patent Document 1, a metal bus bar is fixed to a capacitor substrate via a spacer. The bus bar is fixed to the capacitor substrate with a fastener such as a bolt (screw).

  Fasteners such as bolts (screws) penetrate the bus bar and the spacer and reach the capacitor substrate. The capacitor substrate and the bus bar must be electrically insulated. For this reason, the spacer is comprised with resin which is an electrically insulating material.

JP 2017-77091 A

  In the invention described in Patent Document 1, a resin spacer is employed. For this reason, the outer dimension of the spacer is likely to change due to expansion and contraction due to heat, secular change such as a creep phenomenon, and the like. If the outer dimension of the spacer changes, the fastening force of the bolts may decrease, and the fixing force for fixing the bus bar may decrease.

  In view of the above points, the present application discloses an example of a structure capable of stably fixing a bus bar.

  A control device for an industrial vehicle is arranged on a surface of the base (2) opposite to the vehicle body (B), and is mounted with an electrical component, which is fixed to the vehicle body (B). A substrate (3), an electrode (4) disposed on the opposite side of the base (2) of the substrate (3), and a first fastener for mechanically fixing the electrode (4) to the base (2) (5), the bus bar (6) made of metal that is directly or indirectly connected to the electric device, and the bus bar (6) in a state where the bus bar (6) and the electrode (4) are electrically connected. And a second fastener (7) for mechanically fixing to the electrode (4).

Thereby, the bus bar (6) is mechanically fixed to the electrode (4) by at least the second fastener (7). The electrode (4) is fixed to the base (2) by the first fastener (5).
Since the substrate (3) is configured to be sandwiched between the electrode (4) and the base (2), the electrode (4) is fixed to the base (2) by the first fastener (5). (4) is also configured to be fixed to the substrate (3) by the first fastener (5).

  Since the electrode (4) and the base (2) are electrically insulated, the resin is formed between the second fastener (7), the bus bar (6), and the electrode (4). It is not necessary to arrange an insulating member such as a spacer. Therefore, the bus bar (6) can be stably fixed.

  Incidentally, the reference numerals in the above parentheses are examples showing the correspondence with the specific configurations described in the embodiments described later, and the present invention is limited to the specific configurations indicated by the reference numerals in the parentheses. It is not something.

It is a figure which shows the structure of the control apparatus which concerns on 1st Embodiment of this invention. It is a figure which shows the structure of the control apparatus which concerns on 1st Embodiment of this invention. It is a figure which shows structures, such as a 1st insulating member and a 2nd insulating member, concerning 1st Embodiment of this invention. It is a figure which shows the structure of the control apparatus which concerns on 2nd Embodiment of this invention. It is a figure which shows the structure of the control apparatus which concerns on 3rd Embodiment of this invention.

  The “embodiment of the invention” described below shows an example of an embodiment belonging to the technical scope of the present invention. In other words, the invention specific items described in the claims are not limited to the specific configurations and structures shown in the following embodiments.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the arrow etc. which show the direction attached | subjected to each figure are described in order to make it easy to understand the relationship between each figure. The present invention is not limited to the directions given in the drawings.

  At least one member or part described with at least a reference numeral is provided, except where “one” or the like is omitted. That is, when there is no notice such as “one”, two or more members may be provided.

(First embodiment)
1. Outline of Control Device In this embodiment, a control device according to the present invention is applied to a forklift controller. A control device 1 shown in FIGS. 1 and 2 is a controller for controlling the operation of an electric motor (not shown). The electric motor generates a driving force for traveling of the work vehicle or a driving force for cargo handling. Note that the electric motor is an example of an electric device mounted on an industrial vehicle.

2. 2. Configuration of Control Device 2.1 Overview of Configuration The control device 1 includes at least a base 2, a substrate 3, an electrode 4, a bus bar 6, and the like as shown in FIG. The base 2 is a plate-like member fixed to the metal vehicle body B. The base 2 according to the present embodiment is made of a metal having high thermal conductivity such as aluminum. The vehicle body B is made of a ferrous metal such as structural carbon steel.

  Electrical components are mounted on the substrate 3. The electrical component is, for example, a power control semiconductor element that controls a drive current supplied to the electric motor. The substrate 3 is disposed on the surface of the base 2 opposite to the vehicle body B.

  The substrate 3 includes a metal plate (not shown) and an electrical insulating layer (not shown). The substrate 3 is arranged such that the metal plate is in contact with the base 2 and the electrical insulating layer is located on the opposite side of the base 2 with the metal plate interposed therebetween.

  The electrical component is mounted (soldered) on the electrical insulating layer side. In other words, in FIG. 1, the electrical insulating layer, the copper foil, and the electrical components are disposed on the upper surface side of the substrate 3, and the metal plate is disposed on the lower surface side of the substrate 3. The copper foil is disposed on the opposite side of the metal plate with respect to the electrical insulating layer.

  An electrode 4 is disposed on the side of the insulating layer of the substrate 3 (in this embodiment, a copper foil). The electrode 4 according to the present embodiment supplies a drive current to, for example, an electric motor. The bus bar 6 is a member made of metal (for example, a copper plate) that is directly or indirectly connected to the electric motor. That is, the bus bar 6 is a member through which a relatively large current such as a drive current flows.

  The first fastener 5 is a fastener for mechanically fixing the electrode 4 to the base 2. The first fastener 5 according to the present embodiment is a metal bolt (in this embodiment, a P screw) that is threadedly connected to the base 2 through the bus bar 6, the electrode 4, and the substrate 3.

  Specifically, washers 8 </ b> A and 8 </ b> B are disposed between the head 5 </ b> A of the first fastener 5 and the bus bar 6. The washer 8A is a metal spring washer (spring seat). The washer 8B is a flat metal washer. The neck 5 </ b> B of the first fastener 5, i.e., the male screw portion of the first fastener 5, is fastened in a female screw hole 2 </ b> A formed in the base 2.

  The second fastener 7 is a fastener for mechanically fixing the bus bar 6 to the electrode 4 in a state where the bus bar 6 and the electrode 4 are electrically connected. The 2nd fastener 7 which concerns on this embodiment is the volt | bolt (P screw in this embodiment) which penetrated the bus bar 6 and was screw-coupled to the electrode 4. FIG.

  Specifically, washers 9 </ b> A and 9 </ b> B are interposed between the head 7 </ b> A of the second fastener 7 and the bus bar 6. The washer 9A is a metal spring washer (spring seat). The washer 9B is a metal flat washer.

  The lower neck 7 </ b> B of the second fastener 7, that is, the male thread portion of the second fastener 7 is screwed into a nut 7 </ b> C disposed in the electrode 4. That is, the bus bar 6 and the plate surface 4A of the electrode 4 are sandwiched between the head 7A and the nut 7C of the second fastener 7 and mechanically fixed to each other.

  The 1st fastener 5 is arrange | positioned in the site | part (right side of a paper surface in FIG. 1) near the extending direction front-end | tip of the bus bar 6 rather than the 2nd fastener 7. FIG. In other words, the first fastener 5 is located between the second fastener 7 and the connection destination of the bus bar 6.

  The electrode 4 includes the plate surface 4A, a pair of wall portions 4B, and the like, and has a cross-sectional shape of a “U” shape or a substantially “U” shape (see FIG. 2). That is, the plate surface 4A is a strip-shaped portion that contacts the bus bar 6 (see FIG. 1).

  For this reason, the electrode 4 according to this embodiment can stand on a horizontal plane even before soldering. That is, for example, if the electrode 4 has a shape as shown in FIG. 5, the electrode 4 cannot stand by itself before being soldered to the substrate 3 and falls down. On the other hand, the electrode 4 according to the present embodiment can be self-supporting by the pair of wall portions 4B.

  Each of the pair of wall portions 4B is a portion extending from the one end and the other end in the width direction of the plate surface 4A toward the substrate 3 (electrical insulating layer). The plate surface 4 </ b> A and the pair of wall portions 4 </ b> B are integrally formed products that are integrally formed by press forming a metal plate made of copper or aluminum.

  And between the electrode 4 and the base 2 is comprised in the insulation state which blocked | prevented becoming a short circuit (conduction) state via the 1st fastener 5, and between the bus bar 6 and the base 2 is also 1st. It is configured in an insulated state that prevents a short-circuited state via the fastener 5.

2.2 Details of Insulation Configuration The first fastener 5 and washers 8A and 8B according to the present embodiment are made of metal. For this reason, when the bus bar 6 and the electrode 4 and the first fastener 5 are short-circuited, the bus bar 6 and the electrode 4 and the base 2 are also short-circuited.

  Therefore, a plate-like (disc-like in this embodiment) first insulating member 10 </ b> A is interposed between the head 5 </ b> A (the washer 8 </ b> B in this embodiment) of the first fastener 5 and the bus bar 6. Yes. The first insulating member 10A is electrically insulated between the electrode 4 and the base 2 by preventing the short circuit between the electrode 4 and the base 2 via the first fastener 5 and the bus bar 6. And

  The second insulating member 10 </ b> B is a cylindrical member that is provided on the lower neck 5 </ b> B of the first fastener 5 and covers the lower neck 5 </ b> B. The second insulating member 10B electrically insulates the electrode 4 from the base 2 by preventing the electrode 4 and the base 2 from being short-circuited via the first fastener 5 and the bus bar 6. State.

  The cover portion 10 </ b> C is a cylindrical (cylindrical in the present embodiment) member that covers the head 5 </ b> A of the first fastener 5. In the present embodiment, as shown in FIG. 3, the first insulating member 10 </ b> A, the second insulating member 10 </ b> B, and the cover portion 10 </ b> C are resin-made integrally molded products 10.

3. Features of Control Device According to this Embodiment In the control device 1 according to this embodiment, the bus bar 6 is mechanically fixed to the electrode 4 by at least the second fastener 7. The electrode 4 is fixed to the base 2 by the first fastener 5.

  Since the substrate 3 is sandwiched between the electrode 4 and the base 2, the electrode 4 is also fixed to the substrate 3 by the first fastener 5 when the electrode 4 is fixed to the base 2 by the first fastener 5. It becomes the composition which was done.

  Since the electrode 4 and the base 2 are electrically insulated, there is no need to dispose an insulating member such as a resin spacer between the second fastener 7, the bus bar 6 and the electrode 4. . As a result, the bus bar 6 can be stably fixed.

  The bus bar 6 and the base 2 are also configured in an insulated state that prevents a short circuit state via the first fastener 5. Thereby, it can suppress that the electrode 4 and the base 2 are indirectly short-circuited via the bus bar 6 and the first fastener 5.

  Metal washers 9A and 9B are interposed between the head 7A of the second fastener 7 and the bus bar 6 instead of members whose dimensions change over time, such as resin spacers. For this reason, the fastening force of the second fastener 7 directly acts on the bus bar 6. Therefore, the bus bar 6 can be fixed to the electrode 4 more stably.

  Similarly, since metal washers 8A and 8B are interposed between the first fastener 5 and the bus bar 6, the fastening force of the first fastener 5 directly acts on the bus bar 6. Therefore, the bus bar 6, the electrode 4 and the substrate 3 can be fixed to the base 2 more stably.

  Between the head 5A of the first fastener 5 and the bus bar 6, a first insulating member 10A for electrically insulating the electrode 4 and the base 2 is disposed. Thereby, reliable electrical insulation can be performed.

  The neck 5B of the first fastener 5 is a cylindrical second insulating member 10B that covers the neck 5B, and is a second insulating member for electrically insulating the electrode 4 and the base 2 from each other. 10B is provided. Thereby, reliable electrical insulation can be performed.

  A cylindrical cover 10 </ b> C that covers the head 5 </ b> A of the first fastener 5 is provided. Thereby, it can suppress that dust accumulates in head 5A of the 1st fastener 5, and the 2nd fastener 7 or bus bar 6 and the 1st fastener 5 will be in a bridged state by the accumulated dust. . As a result, reliable electrical insulation can be performed.

  When the second fastener 7 or the bus bar 6 and the first fastener 5 are bridged by dust, the second fastener 7 or the bus bar 6 and the first fastener 5 are short-circuited via the dust bridging portion. There is a risk of becoming a state.

  The first insulating member 10 </ b> A, the second insulating member 10 </ b> B, and the cover portion 10 </ b> C are an integrally molded product 10 made of resin. As a result, the assembly operator can easily attach the first insulating member 10A, the second insulating member 10B, and the cover portion 10C.

  The 1st fastener 5 is arrange | positioned in the site | part near the extension direction of the bus bar 6 rather than the 2nd fastener 7. FIG. Thereby, even when a load acts on the front end side in the extending direction of the bus bar 6 and a bending moment acts on the fixing portion between the bus bar 6 and the electrode 4, the moment can be surely countered.

  That is, since the first fastener 5 is fixed to the base 2, when the bending moment acts on the first fastener 5, the bending moment can be transmitted to the base 2. Since the base 2 has a greater rigidity than the electrode 4, if the bending moment is transmitted to the base 2, the bending moment can be effectively countered.

  On the other hand, since the second fastener 7 is fixed to the electrode 4, the bending moment cannot be transmitted to the base 2. Therefore, if the first fastener 5 is disposed at a position closer to the end of the bus bar 6 in the extending direction than the second fastener 7, the bending moment can be effectively transmitted to the base 2. It can be effectively countered.

  The electrode 4 has a shape that can stand on a horizontal plane. Thereby, the electrode 4 can be easily soldered. In other words, if the electrode 4 has a shape that cannot stand by itself, it is necessary to hold the electrode 4 in a state after soldering with a jig or the like when soldering the electrode 4, so that the soldering workability is reduced. To do.

  The bus bar 6 is mechanically fixed to the electrode 4 by the first fastener 5 and the second fastener 7. Thereby, even if any fastener is loosened, the fixed state of the bus bar 6 and the electrode 4 can be maintained.

(Second Embodiment)
In the first embodiment, the bus bar 6 is fixed to the electrode 4 by the first fastener 5 and the second fastener 7. In contrast, in the present embodiment, as shown in FIG. 4, the bus bar 6 is fixed to the electrode 4 only by the second fastener 7, and the first fastener 5 is not involved in fixing the bus bar 6. Note that the same constituent elements as those of the above-described embodiment are denoted by the same reference numerals as those of the above-described embodiment, and thus redundant description is omitted.

(Third embodiment)
This embodiment is a modification of the second embodiment. As shown in FIG. 5, the electrode 4 according to the present embodiment is bent in a substantially “Z” shape. Note that the same constituent elements as those of the above-described embodiment are denoted by the same reference numerals as those of the above-described embodiment, and thus redundant description is omitted.

(Other embodiments)
In the above-described embodiment, the metal washers 9A and 9B are interposed between the head 7A and the bus bar 6 of the second fastener 7. However, the invention disclosed in this specification is not limited to this.

  That is, for example, the washer 9A, 9B may be abolished, and the head 7A of the second fastener 7 may be in direct contact with the bus bar 6. Even in this configuration, since the fastening force of the second fastener 7 acts directly, the bus bar 6 can be fixed to the electrode 4 more stably.

  In the above-described embodiment, screws such as bolts are employed as the first fastener 5 and the second fastener 7. However, the invention disclosed in this specification is not limited to this. That is, other than bolts may be used as long as the fastener is capable of exerting a mechanical fastening force (for example, a rivet).

  In the above-described embodiment, an electrode having a substantially U-shaped cross-sectional shape is employed as the electrode 4 having a self-supporting shape. However, the invention disclosed in this specification is not limited to this. That is, for example, the block-shaped electrode 4 may be used.

  In the above-described embodiment, the first insulating member 10 </ b> A, the second insulating member 10 </ b> B, and the cover portion 10 </ b> C are integrally molded products 10 made of resin. However, the invention disclosed in this specification is not limited to this.

  That is, for example, at least one of the first insulating member 10A, the second insulating member 10B, and the cover portion 10C is a separate component, or at least one of the first insulating member 10A, the second insulating member 10B, and the cover portion 10C. It may be an abolished configuration.

  In the above-described embodiment, the electrodes 4 and the bus bars 6 and the base 2 are electrically insulated by the first insulating member 10A, the second insulating member 10B, and the cover portion 10C. However, the invention disclosed in this specification is not limited to this.

  That is, for example, the first fastener 5 may be made of an electrically insulating material (for example, resin) so that the electrode 4 and the bus bar 6 are electrically insulated from the base 2.

  The board | substrate 3 which concerns on the above-mentioned embodiment was comprised with the metal plate, the electrical insulating layer, and copper foil. However, the invention disclosed in this specification is not limited to this. For example, instead of a metal plate, a substrate 3 made of a high thermal conductive glass epoxy or the like made of ceramic may be used.

  In the above-described embodiment, the present invention has been described by taking a forklift as an example of an industrial vehicle. However, the invention disclosed in this specification is not limited to this. The invention disclosed in the present specification can be applied to other work vehicles.

  Furthermore, the present invention is not limited to the above-described embodiment as long as it matches the gist of the invention described in the claims. Therefore, you may combine at least 2 embodiment among several embodiment mentioned above.

DESCRIPTION OF SYMBOLS 1 ... Control apparatus 2 ... Base 3 ... Board | substrate 4 ... Electrode 5 ... 1st fastener 6 ... Bus bar 7 ... 2nd fastener 8A, 9A ... Washer (spring seat) 8B, 9B ... Washer (flat washer)
10A ... 1st insulating member 10B ... 2nd insulating member 10C ... Cover part

Claims (9)

In a control device for controlling electrical equipment mounted on an industrial vehicle,
A metal base fixed to the car body,
A substrate on the surface of the base opposite to the vehicle body, on which electrical components are mounted;
An electrode disposed on the opposite side of the base of the substrate;
A first fastener for mechanically securing the electrode to the base;
A metal bus bar connected directly or indirectly to the electrical device;
A second fastener for mechanically fixing the bus bar to the electrode in a state where the bus bar and the electrode are electrically connected;
The control apparatus comprised between the said electrode and the said base in the insulation state which prevented becoming a short circuit state via the said 1st fastener.   2. The control device according to claim 1, wherein the bus bar and the base are also configured to be in an insulated state in which a short circuit state is prevented via the first fastener. The second fastener is constituted by a bolt that penetrates the bus bar and is screwed to the electrode,
The head of the second fastener may be in direct contact with the bus bar, or a metal washer may be interposed between the head of the second fastener and the bus bar. The control device according to 1 or 2. The first fastener includes a metal bolt that penetrates the bus bar, the electrode, and the substrate and is screw-coupled to the base.
Furthermore, between the head of the said 1st fastener and the said bus bar, the insulation member for making an electrical insulation state between the said electrode and the said base is arrange | positioned. The control device according to item 1. When the insulating member is a first insulating member,
A cylindrical second insulating member that is provided under the neck of the first fastener and covers the neck is provided with a second insulating member for electrically insulating between the electrode and the base. The control device according to claim 4.   The control device according to claim 5, further comprising a cylindrical cover portion that covers a head portion of the first fastener.   The control device according to claim 6, wherein the first insulating member, the second insulating member, and the covering portion are integrally molded products made of resin.   The control device according to any one of claims 1 to 7, wherein the first fastener is disposed closer to a distal end of the bus bar in the extending direction than the second fastener.   The control device according to claim 1, wherein the electrode has a shape that can stand on a horizontal plane.

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