KR100424281B1 - A terminal connection structure of rotation electric apparatus - Google Patents

Abstract

The present invention obtains a terminal connection structure of a rotary electric machine that can prevent the ingress into the interior with a simple structure even if a gap is formed between the two due to the difference in the thermal expansion rate of the connection box for terminal connection and the filler filled therein. It aims to do it. In order to achieve the above object, the connection box 12 of the present invention is surrounded by an inner sidewall 24 having a height lower than that of the outer circumferential sidewall 14, and the filler 26 in a state in which the inner sidewall 24 is embedded. Is filled and solidified to cover each component contained in the connection box 12 and its connection portion. Since a labyrinth structure is formed between the outer circumferential side wall 14 and the inner side wall 24 and the filler material 26, and the gap between the outer circumferential side wall 14 and the inner side wall 24 plays a role of "trough", For example, even if a gap is formed between the outer circumferential side wall 14 and the filler 26 due to the difference in thermal expansion rate, it is difficult for water to enter the interior of the connection box 12 from this gap. Therefore, insulation failure or connection failure of a connection part can be prevented.

Description

A TERMINAL CONNECTION STRUCTURE OF ROTATION ELECTRIC APPARATUS}

The present invention relates to a terminal connection structure of a rotary electric machine.

As a rotating electric machine, for example, a motor applied to a power window device of an automobile includes a power supply terminal for power supply, an external terminal for external connection, a noise preventing element (such as a capacitor and a choke coil), or each terminal thereof. And a connection box are provided in the housing for accommodating a wire or the like for connecting the noise preventing element. Moreover, the structure which filled and filled the filler (hot melt adhesive) in this connection box is known for waterproofing and insulation of each received terminal, noise prevention element, an electric wire, or its connection part (for example, Japanese Utility Model Registration Publication No. 2526456).

According to the terminal connection structure as described above, as shown in Fig. 4, the noise preventing element 42 or the terminals such as the capacitor and the choke coil housed in the connection box 40, or the noise preventing element 42 or the terminal are connected. The electric wire 44 (including the connection part) etc. which connect to each other are coat | covered with the filled filler 46, and this filler 46 returns to the detail in the junction box 40, and a junction box (40) Even if itself (the upper part) is opened, there is an advantage that the waterproofing and insulation of each part or its connecting part can be achieved and the vibration of each part can be prevented.

However, in the structure in which the filler 46 is filled and coated in the junction box 40 as described above, when the temperature change of the surrounding environment of the site where the motor is placed is large, the junction box 40 itself by these cold-heat cycles and Due to the difference in the thermal expansion rate (thermal contraction rate) of the filler 46, a gap may occur between the inner peripheral surface of the side wall 48 of the junction box 40 and the solidified filler 46.

In this way, if a gap is formed between the inner circumferential surface of the side wall 48 of the connection box 40 and the solidified filler 46, for example, when the motor makes water splash, there is a possibility that water may invade from the gap. Therefore, in the case where coating | covering with sufficient filler 46 is not performed in the narrow part between the noise prevention element 42 or the connection part (terminal) of a terminal and an electric wire 44, and the bottom part of the connection box 40, etc. If water enters from the gap, it may cause insulation failure or poor connection.

In addition, when attempting to prevent such ingress of water, it is necessary to attach a separate new waterproof cover 50 to the upper opening portion of the connection box 40, thereby increasing the cost.

In view of the above fact, the present invention fills and covers a filler in a junction box installed in a housing, and in order to achieve waterproofing and insulation, between the inner wall of the junction box and the solidified filler due to the difference in thermal expansion rate between the junction box and the filler. It is an object to obtain a terminal connecting structure of a rotary electric machine that can prevent a immersion into a connecting portion of a terminal, an element and an electric wire even with a gap in the structure by a simple structure.

1 is a plan view showing the configuration of a plate cover to which the terminal connection structure of the rotary electric machine according to the embodiment of the present invention is applied.

Fig. 2 is a sectional view taken along line 2-2 of Fig. 1 showing the structure of a connection box of a plate cover to which a terminal connection structure of a rotary electric machine according to an embodiment of the present invention is applied.

3 is a cross-sectional view showing a modification of the junction box of the plate cover to which the terminal junction structure of the rotary electric machine according to the embodiment of the present invention is applied.

Fig. 4 is a sectional view showing the structure of a connection box of a plate cover to which a conventional terminal connection structure is applied.

* Short description of drawing symbols *

10: plate cover 12: connection box

14: outer side wall 16: power supply terminal

18: external terminal 20: noise protection element

22: wire 24: inner sidewall

26: filling material 28: groove

The terminal connection structure of the rotary electric machine according to claim 1 is housed in a connection box provided in a housing of the rotary electric machine, with terminals having one end introduced therein and electrical elements connected to each other, In a terminal connecting structure of a rotary electric machine which is filled with an insulating filler and solidified to cover each of the accommodated parts, an inner sidewall having a height lower than a height of the outer circumferential sidewall of the junction box is formed on the inner circumference side of the junction box. It is formed so as to be spaced apart from the side wall, and the said filler is solidified by filling in the said connection box with the said internal side wall embedded.

In the terminal connection structure of the rotary electric machine of Claim 1, the inner side wall which height is lower than the height of the outer side wall is formed in the connection box with which the housing of the rotary electric machine is spaced apart from the outer side wall, and is connected, The inside of the box (that is, each housed part) is covered by filling and solidifying the insulating filler with the inner sidewall embedded.

Here, in this terminal connection structure, since the inner sidewall which is lower than the height of the outer sidewall is enclosed in the connection box, a labyrinth structure is formed between these outer sidewall and inner sidewall, and filling and solidified filler. In addition, the gap between the outer circumferential side wall and the inner side wall serves as a so-called "trough". For this reason, the temperature change of the surrounding environment of the site | part where a rotary electric machine is arrange | positioned is large, for example, due to the difference in the thermal expansion rate (heat shrinkage rate) of a junction box and a filler, and between the inner peripheral wall surface of a junction box and a solidified filler. Even if a gap is formed, it is difficult for water to enter the interior of the connection box from this gap. Therefore, poor insulation and poor connection, such as the connection part of a terminal and a noise prevention element, can be prevented.

Thus, in the terminal connection structure of the rotary electric machine of Claim 1, in filling and covering a filler in the junction box with which the housing was equipped, and attaining waterproofing and insulation, a junction box is changed by the difference of the thermal expansion rate of a junction box and a filler. Even if a gap is formed between the inner circumferential wall and the solidified filler, immersion into the connecting portion of the terminal can be prevented with a simple structure.

The terminal connection structure of the rotary electric machine of the invention according to claim 2 is characterized in that a groove is formed between the outer circumferential sidewall of the connection box and the inner sidewall in the rotary connection terminal structure according to claim 1. .

In the terminal connection structure of the rotary electric machine of claim 2, since the groove portion is formed between the outer peripheral side wall and the inner side wall of the connection box, the maze structure formed between the outer peripheral side wall, the inner side wall and the groove portion and the filler becomes more complicated. In addition, it is possible to further improve the immersion prevention function.

The terminal connection structure of the rotary electric machine of the invention of Claim 3 is the terminal connection structure of the rotary electric machine of Claim 1 or 2 WHEREIN: The said filler is a flame-retardant urethane resin, It is characterized by the above-mentioned.

Here, when a hot melt adhesive is applied and filled as a filler to fill the inside of the connection box, bubbles tend to enter the interior due to the properties of the hot melt adhesive, and this bubble becomes a continuous connection state and thus forms a passage after curing. There is a risk of flooding from the passage.

On the other hand, in the terminal connection structure of the rotary electric machine of Claim 3, since a flame-retardant urethane resin is used as a filler, it is hard to enter an air bubble inside, and it is hard to deform | transform (thermal expansion and thermal contraction) also with temperature change. Therefore, the ability to prevent the invasion of water is improved.

In addition, when filling a urethane resin in a junction box, what is necessary is just to fill it at 80 degreeC-100 degreeC, and to make it cool and solidify after making it flow at about 80 degreeC.

Example

1 is a plan view of a plate cover 10 to which a terminal connection structure of a rotary electric machine according to an embodiment of the present invention is applied.

The plate cover 10 constitutes a part of the housing of the wiper drive motor for driving the vehicle wiper, and the connection box 12 is integrally provided with the plate cover 10 by a synthetic resin. The connection box 12 is formed so that the upper part is opened by installing the outer peripheral side wall 14 upright.

In the connection box 12, one end of each of the power supply terminal 16 for power supply and the external terminal 18 for external connection is introduced, and the noise prevention element 20 (capacitor, choke coil, etc.) is introduced. ) Is accommodated. These power supply terminals 16, the external terminal 18, and the noise prevention element 20 are connected to each other by the wires 22, respectively.

In addition, the inner side wall 24 is formed in the connection box 12. As shown in detail in FIG. 2, the inner sidewall 24 is formed to have a height lower than the height of the outer circumferential sidewall 14 of the junction box 12, and the outer circumferential sidewall 14 on the inner circumferential side of the junction box 12. It is formed so as to surround the whole periphery with space | interval.

In addition, an insulating filler 26 is contained in the connection box 12 in which the power supply terminal 16, the external terminal 18, the noise preventing element 20, and the electric wire 22 (including the connecting portion) are accommodated. ) Is charged and solidified. In addition, in FIG. 1, this filler 26 is abbreviate | omitted and shown. The filler 26 is filled and solidified in the connection box 12 and in detail in the outer circumferential sidewall 14 with the inner sidewall 24 embedded therein. ) Is completely covered.

In addition, as the filler 26, a flame-retardant urethane resin is applied. When filling this urethane resin in the connection box 12, it is good to fill it at 80 degreeC-100 degreeC, and to make it flow about 80 degreeC, and to cool and solidify.

Next, the operation of the present embodiment will be described.

In the plate cover 10 to which the terminal connection structure of the rotary electric machine of the said structure was applied, the connection box 12 with which the plate cover 10 which comprises the housing | casing of a rotary electric machine is equipped rather than the height of the outer peripheral side wall 14 is shown. The inner side wall 24 having a low height is formed to surround the outer side wall 14 at intervals, and the inside of the connection box 12 (that is, each of the parts accommodated) has an insulating filler 26 with the inner side wall. It is coat | covered by filling and solidifying in the state of embedding (24).

Here, the connection box 12 is formed so as to surround the inner sidewall 24 having a height lower than the height of the outer circumferential sidewall 14, and thus is filled with these outer circumferential sidewalls 14 and the inner sidewall 24 and solidified. A labyrinth structure is formed between 26. In addition, the space | interval between the outer peripheral side wall 14 and the inner side wall 24 plays a role of what is called a "groove". For this reason, for example, the temperature change of the surrounding environment of the site | part where the rotary electric machine (in other words, the plate cover 10) is arrange | positioned is large, and the difference of the thermal expansion rate (thermal contraction rate) between the connection box 12 and the filler 26 is large. Due to this, even if a gap is formed between the outer circumferential side wall 14 of the connection box 12 and the solidified filler 26, water is hard to penetrate into the connection box 12 from this gap. Therefore, insulation failure or connection failure, such as the power supply terminal 16 and the external terminal 18, the noise prevention element 20 itself, or the connection part with the electric wire 22, can be prevented.

In this case, when the filling material 26 filling the junction box 12 is filled with, for example, a hot melt adhesive, bubbles are easily introduced into the inside due to the properties of the hot melt adhesive, and deformation (thermal expansion and Heat shrink), so that the ability to prevent intrusion of water is poor.

On the other hand, in the plate cover 10 to which the terminal connection structure of the rotary electric machine according to the present embodiment is applied, since the flame-retardant urethane resin is applied as the filler 26, bubbles are hard to enter into the inside, and Since deformation (thermal expansion and thermal contraction) is difficult to perform, the ability to prevent the invasion of water is improved.

Thus, in the terminal connection structure (plate cover 10 to which this is applied) of the rotary electric machine according to the present embodiment, in filling and covering the filler 26 in the connection box 12, and in order to achieve waterproofing and insulation, Even if a gap occurs between the inner circumferential wall surface of the junction box 12 and the solidified filler 26 due to the difference in the thermal expansion rate of the junction box 12 and the filler 26, the immersion into the connection portion of each terminal or element is simplified. It can prevent with structure.

In addition, in the above-described embodiment, the labyrinth structure has been described as a configuration in which a labyrinth structure is formed between the inner sidewall 24 and the outer circumferential sidewall 14 formed in the connection box 12 and the filling and solidifying filler 26. The structure can be made more complex.

For example, as shown in FIG. 3, the groove part 28 is formed between the outer peripheral side wall 14 and the inner side wall 24 of the connection box 12. As shown in FIG. When the groove portion 28 is formed between the outer circumferential side wall 14 and the inner side wall 24 in this manner, the maze structure is formed between the outer circumferential side wall 14, the inner side wall 24 and the groove portion 28 and the filler 26. Becomes more complicated, and the immersion prevention function can be further improved.

As described above, according to the present invention, an inner sidewall 24 having a height lower than that of the outer circumferential sidewall in the junction box is enclosed, and the inner sidewall is buried by a filler of urethane resin, thereby reducing the thermal expansion rate of the junction box and the filler. Even if a gap is formed between the two parts due to the difference, it is possible to prevent water from entering the inside of the connection box through this gap, thereby providing an effect of reliably preventing the poor insulation or poor connection of the connection portion. Have

Claims (5)

In a connection box provided in a housing of a rotating electric machine, a terminal having one end introduced therein and an electric element are accommodated in a state of being connected to each other, and the inside of the connection box is filled and solidified with an insulating filler to cover each of the accommodated parts. In the terminal connection structure of a rotary electric machine, An inner sidewall having a height lower than a height of an outer circumferential sidewall of the junction box is formed so as to surround the inner circumferential side of the junction box at intervals from the outer circumferential sidewall, and the filler is filled with the inner sidewall. The terminal connection structure of the rotary electric machine which filled and solidified. The method of claim 1, And a groove portion is formed between the outer circumferential side wall and the inner side wall of the connection box. The method according to claim 1 or 2, The said filler is a terminal connection structure of the rotary electric machine which is a flame-retardant urethane resin. The method according to claim 1 or 2, The connection box is a terminal connection structure of a rotary electric machine formed integrally with the plate cover constituting the housing by a synthetic resin. The method according to claim 1 or 2, The rotary electric machine is a wiper driving motor for driving a vehicle wiper, and the connection box is accommodated in a state in which a power supply terminal supplied to the electric motor and a noise preventing element for preventing noise of the motor are connected. Terminal connection structure of rotary electric machine.