JP3513080B2 - Terminal connection structure of rotating electric machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal connection structure for a rotary electric machine.

[0002]

2. Description of the Related Art As a rotary electric machine, for example, a motor applied to a power window device of an automobile, a power supply terminal for power supply, an external terminal for external connection, a noise prevention element (capacitor, choke coil, etc.), or these A connection box is provided in the housing for accommodating an electric wire or the like connecting each terminal and the noise prevention element. In addition, there is known a structure in which the inside of this connection box is filled and covered with a filling material (hot melt adhesive) in order to waterproof and insulate the accommodated terminals, noise prevention elements, electric wires and their connecting parts. (For example, utility model registration gazette No. 25
26456).

According to the terminal connection structure as described above, as shown in FIG. 4, the noise preventing elements 42 and terminals such as capacitors and choke coils housed in the connection box 40 or these noise preventing elements 42 and terminals are mutually connected. The electric wire 44 (including the connecting portion) to be connected and the like are covered with the filled filling material 46, and the filling material 46 wraps around to the details inside the connection box 40, so that the connection box 4
Even if 0 itself (the upper part) is open, there is an advantage that each component and its connecting portion can be waterproofed / insulated to prevent vibration of each component.

However, the connection box 4 as described above is used.
In the structure in which the filling material 46 is filled in 0 and covered,
If the temperature change of the surrounding environment of the portion where the motor is arranged is large, the side wall of the connection box 40 is caused by the difference in the coefficient of thermal expansion (heat contraction rate) between the connection box 40 itself and the filler 46 due to these cooling and heating cycles. There is a possibility that a gap may occur between the inner peripheral surface of the resin 48 and the solidified filler 46.

When a gap is formed between the inner peripheral surface of the side wall 48 of the connection box 40 and the solidified filling material 46 as described above,
For example, when the motor sprays water, water may enter through the gap. Therefore, in the case where the narrow portion between the noise prevention element 42 or the connection portion (terminal) between the terminal and the electric wire 44 and the bottom portion of the connection box 40 is not sufficiently covered with the filling material 46, for example, from the gap. Water ingress may cause insulation failure or connection failure.

Further, in order to prevent such intrusion of water, it is necessary to mount another new waterproof cover 50 on the upper open portion of the connection box 40, resulting in an increase in cost.

[0007]

SUMMARY OF THE INVENTION In consideration of the above facts, the present invention takes thermal expansion of the connection box and the filling material in filling and covering the connection box provided in the housing for waterproofing and insulation. Even if a gap occurs between the inner wall surface of the connection box and the solidified filling material due to the difference in the ratio, it is possible to prevent water from entering the connection part between the terminal or element and the electric wire with a simple structure. The purpose is to obtain a terminal connection structure.

[0008]

According to a first aspect of the present invention, there is provided a terminal connecting structure for a rotary electric machine, which constitutes a housing of the rotary electric machine.
The outer side wall stands upright on the plate cover
Formed open, the top open part has another waterproof
Connection box that is left open without the cover attached
The connection box has a terminal and one end of which is introduced and arranged and the noise prevention element is connected to each other, and the connection box is filled and solidified with an insulative filling material. In the terminal connection structure of the rotating electric machine covering each of the parts described above, an inner side wall having a height lower than that of the outer peripheral side wall of the connection box is surrounded on the inner peripheral side of the connection box with a space from the outer peripheral side wall. And the inner sidewall is filled with the filler and the outer sidewall is formed.
It is characterized in that it is filled and solidified in the connection box to a height not higher than that.

According to another aspect of the present invention, there is provided a terminal connecting structure for a rotating electric machine, wherein an inner side wall having a height lower than that of the outer side wall is formed in a connection box provided in the housing of the rotating electric machine so as to be spaced from the outer side wall. Further, the inside of the connection box (that is, each of the accommodated components) is covered with the insulating filler which is filled and solidified in a state where the inner side wall is buried.

Here, in this terminal connection structure, since the inner side wall having a height lower than the height of the outer peripheral side wall is formed surrounding the connection box, the outer peripheral side wall and the inner side wall are filled with the solidified filling material. A labyrinth structure is formed between them.
Moreover, the distance between the outer side wall and the inner side wall is a so-called "gutter".
Plays the role of. For this reason, if the temperature of the surrounding environment around the part where the rotating electrical machine is arranged is large, the difference between the thermal expansion coefficient (thermal contraction rate) of the connection box and the filling material causes the internal wall surface of the connection box to be different. Even if a gap is formed between the filler and the solidified filler, it becomes difficult for water to enter the inside of the connection box through the gap. Therefore, it is possible to prevent insulation failure or connection failure at the terminal or the connection portion of the noise prevention element.

As described above, in the terminal connecting structure for a rotating electric machine according to the first aspect of the present invention, in filling and covering the inside of the connection box provided in the housing with the filler for waterproofing and insulation, the connection box and the filler are separated from each other. Even if a gap is generated between the inner wall surface of the connection box and the solidified filler due to the difference in the coefficient of thermal expansion, it is possible to prevent water from entering the connection portion of the terminal with a simple structure.

According to a second aspect of the present invention, there is provided a terminal connection structure for a rotary electric machine according to the first aspect, wherein a groove is formed between the outer peripheral side wall and the inner side wall of the connection box. It is characterized by that.

In the terminal connecting structure of the rotating electric machine according to the second aspect, since the groove is formed between the outer peripheral side wall and the inner side wall of the connection box, the outer peripheral side wall, the inner side wall and between the groove and the filler are formed. The maze structure formed becomes more complicated, and the water infiltration prevention function can be further improved.

According to a third aspect of the present invention, there is provided a terminal connecting structure for a rotary electric machine according to the first or second aspect, wherein the filler is a flame-retardant urethane resin. It has a feature.

When a hot melt adhesive is applied and filled as a filling material for filling the inside of the connection box, bubbles are likely to enter inside due to the nature of the hot melt adhesive, and the bubbles are in a continuous connected state. There is a risk that a passage will be formed after curing and water will infiltrate from this passage.

On the other hand, in the terminal connecting structure of the rotating electric machine according to the third aspect, since the flame-retardant urethane resin is applied as the filling material, it is difficult for bubbles to enter inside and the temperature change is also prevented. Prevents deformation because it is difficult to deform (heat expansion / contraction).

When the connection box is filled with the urethane resin, it is preferable that the connection box is filled at 80 ° C. to 100 ° C., fluidized at about 80 ° C., and then cooled and solidified.

[0018]

1 is a plan view showing a structure of a plate cover 10 to which a terminal connecting structure for 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 rotary electric machine and is provided with a connection box 12. This connection box 12 has an outer peripheral side wall 14
Is formed so that the upper part is opened and formed.

In the connection box 12, one end of each of a power supply terminal 16 for power supply and an external terminal 18 for external connection is introduced and arranged, and a noise prevention element 20 (capacitor, choke coil, etc.) is further housed. ing. These power supply terminal 16, external terminal 18, and noise prevention element 20
Are connected to each other by electric wires 22.

Further, the connection box 12 has an inner side wall 2
4 are formed. As shown in detail in FIG. 2, the inner side wall 24 is formed to have a height lower than the height of the outer peripheral side wall 14 of the connection box 12, and the entire inner peripheral side of the connection box 12 is spaced from the outer peripheral side wall 14 at a distance from the outer peripheral side wall 14. Is formed around.

Further, the power supply terminal 16, the external terminal 18, the noise prevention element 20, and the electric wire 22 (including their connecting portions).
Insulating filler 26 is filled and solidified in the connection box 12 in which the above components are stored. The filler 26 is omitted in FIG. 1. The filling material 26 is filled and solidified in the connection box 12, specifically, in the outer peripheral side wall 14 in a state where the inner side wall 24 is buried, thereby completely covering the accommodated parts and the inner side wall 24. is doing.

Here, a flame-retardant urethane resin is applied as the filler 26. When filling the connection box 12 with this urethane resin, the temperature is 80 ° C to 100 ° C.
It is good to fill at 0 ° C., flow at about 80 ° C., and then solidify by cooling.

Next, the operation of this embodiment will be described.

In the plate cover 10 to which the terminal connecting structure of the rotating electric machine having the above-mentioned structure is applied, the connecting box 12 provided in the plate cover 10 constituting the housing of the rotating electric machine has a height higher than that of the outer peripheral side wall 14. The lower inner side wall 24 is formed so as to surround the outer peripheral side wall 14 at a distance from the outer peripheral side wall 14, and further, in the connection box 12 (that is, each of the accommodated components), the insulating side wall 26 is embedded with the inner side wall 24. It is covered by being filled and solidified with.

Here, the connection box 12 has an outer peripheral side wall 1
Since the inner side wall 24 having a height lower than the height of 4 is surrounded and formed, a labyrinth structure is formed between the outer peripheral side wall 14 and the inner side wall 24 and the filling and solidified filling material 26. Moreover, the space between the outer peripheral side wall 14 and the inner side wall 24 plays a so-called "gutter" role. For this reason,
The temperature change of the surrounding environment of the portion where the rotating electric machine (in other words, the plate cover 10) is arranged is large, and the connection box 12 and the filler 26 are connected due to the difference in the thermal expansion coefficient (thermal contraction rate). Even if a gap is formed between the outer peripheral side wall 14 of the box 12 and the solidified filler 26, it is difficult for water to enter the inside of the connection box 12 through this gap. Therefore, the power supply terminal 16 and the external terminal 18 and the noise prevention element 20
It is possible to prevent insulation failure or connection failure in itself or in the connection portion with the electric wire 22.

If, for example, a hot melt adhesive is applied and filled as the filler 26 for filling the inside of the connection box 12, bubbles are likely to enter the inside due to the nature of the hot melt adhesive and the temperature change against the temperature change is caused. Deformation (thermal expansion
Since it easily undergoes heat shrinkage, it has poor prevention.

On the other hand, in the plate cover 10 to which the terminal connecting structure of the rotary electric machine according to this embodiment is applied,
Since a flame-retardant urethane resin is applied as the filler 26, bubbles are unlikely to enter the inside, and deformation (thermal expansion / contraction) with respect to temperature changes is difficult, and thus the preventive property is improved.

As described above, the terminal connecting structure of the rotary electric machine according to the present embodiment (the plate cover 1 to which this is applied)
In 0), in order to fill the inside of the connection box 12 with the filling material 26 and cover the same for waterproofing and insulation, the connection box 1
2 due to the difference in the coefficient of thermal expansion between the filler 2 and the filler 26
(2) Even if a gap is generated between the inner peripheral wall surface and the solidified filling material 26, it is possible to prevent water from entering the connection parts of the terminals and the elements with a simple structure.

In the above-described embodiment, the maze structure is formed between the inner side wall 24 and the outer side wall 14 formed in the connection box 12 and the filled and solidified filler 26. The maze structure can be made more complicated.

For example, as shown in FIG. 3, the connection box 1
The groove portion 28 is formed between the outer peripheral side wall 14 and the inner side wall 24. If the groove portion 28 is formed between the outer peripheral side wall 14 and the inner side wall 24 in this way, the labyrinth structure formed between the outer peripheral side wall 14, the inner side wall 24 and the groove portion 28 and the filling material 26 becomes more complicated, The water infiltration prevention function can be further improved.

[Brief description of drawings]

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

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

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

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

[Explanation of symbols]

10 Plate cover 12 connection box 14 Outer side wall 16 power supply terminals 18 external terminals 20 Noise prevention element 22 electric wire 24 Internal side wall 26 Filling material 28 Groove

Continuation of the front page (56) References JP-A-3-35504 (JP, A) JP-A-8-203761 (JP, A) JP-A-8-88420 (JP, A) Actual development Sho-57-84747 (JP , U) Utility model registration 2526456 (JP, Y2) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02K 5/00-5/26

Claims (3)

(57) [Claims] 1. A play constituting a housing of a rotating electric machine.
The outer side wall is erected on the cover to open the upper part
The upper open part is equipped with another waterproof cover.
It has a connection box that is not worn and remains open,
In the connection box, a terminal having one end introduced and a noise prevention element are housed in a state of being connected to each other, and the housing box is filled and solidified with an insulative filler to solidify the housed parts. In the terminal connection structure of the rotating electric machine covered, the inner side wall having a height lower than the height of the outer peripheral side wall of the connection box is formed on the inner peripheral side of the connection box with a space from the outer peripheral side wall, and the filling is performed. A terminal connection structure for a rotating electric machine, characterized in that a material is filled in the connection box and solidified in a state where the inner side wall is buried and is equal to or lower than a height of the outer side wall . 2. The terminal connection structure for a rotary electric machine according to claim 1, wherein a groove is formed between the outer peripheral side wall and the inner side wall of the connection box. 3. The terminal connection structure for a rotary electric machine according to claim 1, wherein the filler is a flame-retardant urethane resin.