JP4725414B2 - Electric motor with output terminal - Google Patents

Description

  The present invention relates to a waterproof structure for an electric motor with an output terminal in which a stator winding is connected to an output terminal via a lead wire.

  Conventionally, an output terminal represented by a cannon plug is generally used for a motor for waterproofing. A stator winding is connected to the cannon plug via a lead wire by soldering, and is screwed to the motor body via a hollow spacer.

On the other hand, in order to eliminate the slack of the lead wire while improving the connection work between the lead wire and each terminal of the cannon plug, a spacer that can be mounted after dividing the spacer and connecting the lead wire has been proposed (for example, Patent Document 1 and Patent Document 2).
JP-A-10-271740 Japanese Utility Model Publication No. 60-119867

  The problem to be solved is to secure waterproofness after connecting the output terminal and the lead wire. That is, if the spacer is divided in the axial direction in order to improve the connection work between the lead wire and the output terminal as in the prior art, the pressure due to the screw fixing does not act on the dividing surface, and thus the plate-like packing cannot be used.

  In order to ensure waterproofness in the above-described conventional divided structure, it is necessary to use liquid silicon or the like on the dividing surface, and the silicon protruding from the dividing surface has to be wiped off, and workability is poor.

  The present invention solves the above-mentioned conventional problems, and provides an electric motor with an output terminal that can secure a waterproof function of the lead portion while improving the connection work between the lead wire and the output terminal and preventing slack in the lead wire. With the goal.

In order to solve the above problems, the present invention relates to an electric motor that fixes an output terminal connected to a stator winding via a lead wire to an electric motor body, and has an output terminal with a waterproof structure having a flange portion around it,
A first packing disposed between a bottom surface of the motor main body and the terminal cover, the spacer including a spacer for securing a gap between the brim portion and the electric motor main body, and a terminal cover that covers the flange portion and the spacer from the outside; And an electric motor with an output terminal that is waterproofed by a second packing disposed between the output side of the brim portion and the terminal cover .

  According to the electric motor with an output terminal of the present invention, the plate-like first packing and the second packing are pressed by the tightening force for fixing the terminal cover to the electric motor body, so that the waterproof function is ensured even if the divided spacer is used. can do. Further, the connecting workability between the lead wire and the output terminal can be ensured by the divided spacer as in the conventional case.

Further, by providing a slit in the spacer, the lead wire after soldering can be easily accommodated in the spacer.

  Moreover, if the collar part of an output terminal is screw-fixed to a terminal cover, a waterproof function can be obtained without using a spacer.

  In addition, at least one of the two packings may be changed to liquid silicon, and similarly a waterproof function can be secured.

  Therefore, the waterproof performance of the lead portion can be ensured while improving the connection work between the lead wire and the output terminal and preventing the slack of the lead wire.

  A waterproof structure output terminal having a hole in the flange, a spacer that secures a gap between the flange and the electric motor body, a terminal cover that covers the flange and the spacer from the outside, and has a screw fixing hole, A rubber first packing disposed between the electric motor main body and the bottom surface of the terminal cover, and a rubber second packing disposed between the output side of the flange portion and the terminal cover, and the spacer 1 in the axial direction. After dividing by two slits and connecting the output terminal and the lead wire, the lead wire can be mounted from the lateral direction, and the waterproof function in the axial direction is secured by the action of the two packings.

  The basic configuration of the present invention will be described with reference to the drawings. In FIG. 1, 1 is an output terminal, 2 is a lead wire, 3 is a spacer, 4 is a terminal cover, 5 is a first packing, 6 is a second packing, 7 is a fixing bolt, and 10 is an electric motor body.

  The output terminal 1 is a cannon plug, which is provided with four mounting holes 1b in a square flange portion 1a and a screw (not shown) for fastening on a wall portion surrounding the output side terminal. Secure by waterproofing by tightening.

  The lead wire 2 connected to the stator winding is connected to the opposite terminal. By setting the lead wire 2 to the minimum length within the range where the lead wire 2 and the terminal can be soldered. The mounting space for the output terminal 1 can be minimized while preventing the slack of the lead wire 2.

  For this reason, it is necessary to divide the spacer 3 as in the conventional case. In the first embodiment, the spacer 3 is set to be accommodated inside the terminal cover 4 while being divided into two U-shapes.

  Thus, after the lead wire 2 and the output terminal 1 are soldered first, the lead wire 2 can be mounted so as to be sandwiched from both sides by the divided spacers 3.

  Next, the structure for ensuring the waterproof function which is the characteristic of this invention is demonstrated. The terminal cover 4 made of synthetic resin has a substantially square cup shape, and has an opening that covers and accommodates the flange portion 1a of the output terminal 1, the lead wire 2 and the spacer 3, and the center of the opposite surface (bottom portion). Is provided with a round hole through which the wall of the output terminal 1 passes. Further, in order to fix the terminal cover 4 to the electric motor body 10 with the fixing bolts 7, the bolt holes 4a through which the screw portions of the fixing bolts 7 pass at the same pitch as the mounting holes 1b provided in the flange portion 1a. Provided.

The first packing 5 is made of a thin rubber plate having excellent weather resistance and chemical resistance. The outer shape of the first packing 5 is substantially the same as that of the terminal cover 4, and a hole portion through which the lead wire 2 passes in the center and mounting holes for the output terminal 1 at the four corners. Round holes are arranged at the same pitch as 1b and can be obtained by pressing. Since the second packing 6 is arranged inside the terminal cover 4, the second packing 6 is the same except that the outer shape is smaller than that of the first packing 5 and the central hole shape is different.

  Here, the assembly work will be described. First, the lead wire 2 is passed through the central hole of the first packing 5, and a predetermined lead wire 2 is soldered to each terminal of the output terminal 1. Next, when the lead wire 2 is mounted so as to be sandwiched from both sides by the two divided spacers 3, the spacer 3 and the first packing 5 are arranged immediately below the flange portion 1 a of the output terminal 1.

  Further, the second packing 6 is arranged on the upper surface of the flange portion 1a, the position of the mounting hole is adjusted, and finally the terminal cover 4 is covered, and the bolt hole 4a is fixed to the electric motor main body 10 through the fixing bolt 7. Since this screw tightening force acts on the two packings, the packings can be brought into close contact with each other on both the output terminal side and the motor main body side to ensure a waterproof function.

  The materials and shapes of the terminal cover, spacer, and packing are not limited to those described in the first embodiment, and may be determined in consideration of mechanical strength, weather resistance, and the like.

  Further, the output terminal is not limited to the canon plug, and can be implemented with a waterproof output terminal having a similar configuration (for example, JN1, JN2 series of Japan Aviation Electronics Co., Ltd.).

  For example, the second packing may be changed from a plate packing to an O-ring. In this case, a stepped portion or a chamfer is provided inside the central circular hole of the terminal cover 4, and the flange portion 1 a of the output terminal 1 and the terminal cover 4 The O-ring is sandwiched between the stepped portion or the chamfer, and the O-ring is brought into close contact with a screw tightening force to ensure a waterproof function.

  Furthermore, at least one of the first packing and the second packing according to the first embodiment may be changed from the plate packing to the liquid silicon, or may be used in combination. In this case, it is only necessary to apply liquid silicon to the opening and / or inner bottom of the terminal cover before mounting, and if grooves are provided on the opening and bottom of the terminal cover, the liquid silicon enters the groove at the same time. The protrusion can be suppressed and a more effective waterproof structure is obtained.

  In the first embodiment, the spacer divided into two U-shapes has been described. However, the spacer according to the second embodiment has a single structure. Since the configuration other than the spacer is the same as that of the first embodiment, the description thereof is omitted.

  In FIG. 2, the cylindrical spacer 23 is functionally divided by one slit 23a (opening) provided in the axial direction, and the slit width is such that the lead wire soldered to the output terminal passes. You only have to set it.

  By providing the slit 23a, the output terminal and the lead wire can be soldered first as in the first embodiment, and the spacer 23 can be inserted from the lateral direction after the solder connection as in the first embodiment. Moreover, a waterproof function can be ensured by making it the same structure as Example 1 except spacer 23. FIG.

  Note that the spacer may be cylindrical, and if the outer diameter of the spacer is set so as to secure a wall thickness that can withstand the fastening force of screw fixing and a slight clearance from the inner peripheral surface of the terminal cover, At this time, it is difficult to shift the position, and the space for penetrating the bolts can be secured at the four corners.

The third embodiment does not use the spacer as in the first and second embodiments, but instead fixes the output terminal to the terminal cover with screws.

  In FIG. 3, a screw is provided in each mounting hole 31 b of the flange portion 31 a of the output terminal 31, and the output terminal 31 is fixed to the terminal cover 34 using the bolt hole 34 a of the terminal cover 34. For this reason, four bolt holes 34b for bolting the terminal cover 34 to the electric motor main body 30 are additionally provided. If the same output terminal as in the first embodiment is used, the outer shape of the terminal cover 34 is larger than that in the first embodiment.

  After connecting the lead wire 32 to the output terminal 31, there is a contrivance for fixing the output terminal 31 to the terminal cover 34 with screws.

  First, as in the first embodiment, the lead wire 32 that penetrates the first packing 35 is soldered to the output terminal 31. Thereafter, two jigs 38 are mounted immediately below the flange 31a. Then, the second packing 36 is arranged and positioned on the upper side of the flange portion 31 a, covers the terminal cover 34, and the output terminal 31 is fixed to the terminal cover 34 with four screws 39.

  The jig 38 is formed by bending a thin plate into an L shape as shown in FIG. 4. The jig 38 functions as a temporary spacer until the screw is fixed, and after fixing the output terminal 31 to the terminal cover 34, It is only necessary to lift the outside and change the position by 90 degrees, and then pull it outward. Finally, the terminal cover 34 is bolted to the electric motor body 30 with the fixing bolt 37.

  In Example 3, as described in Example 1, the plate-shaped packing may be replaced with liquid silicon.

  The electric motor with an output terminal of the present invention is most suitable for a waterproof output terminal having a brim portion, and a waterproof function can be secured by two packings, and lead wire connection workability can be improved.

Structure explanatory drawing of the principal part in Example 1 of this invention The perspective view of the spacer in Example 1 of this invention Structure explanatory drawing of the principal part in Example 2 of this invention Explanatory drawing of the jig | tool in Example 2 of this invention

Explanation of symbols

1,31 Output terminal 1a, 31a Head portion 1b, 31b Mounting hole 2, 32 Lead wire 3, 23 Spacer 4, 34 Terminal cover 4a, 34a, 34b Bolt hole 5 First packing 6 Second packing 7, 37 Fixing bolt 23a Slit 38 Jig 39 Screw

Claims (5)

In the motor that fixes the output terminal connected to the stator winding via the lead wire to the motor body,
A waterproof structure output terminal having a flange around the periphery ;
A spacer for securing a clearance between the motor body and the flange portion,
And a terminal cover for covering the spacer and the flange portion from the outside,
An electric motor with an output terminal, wherein the electric motor is waterproofed by a first packing disposed between the electric motor main body and the bottom surface of the terminal cover, and a second packing disposed between the output side of the flange portion and the terminal cover. The electric motor with an output terminal according to claim 1, wherein the spacer is constituted by a plurality of parts so as to surround the lead wire. The electric motor with an output terminal according to claim 1, wherein the spacer is composed of a single part having a slit. The electric motor with an output terminal according to any one of claims 1 to 3, wherein the spacer is unnecessary by fixing the flange portion to the terminal cover with the second packing interposed therebetween. Output terminals with electric motor as claimed in any one of claims 1 to 4, characterized in that at least one of the second packing and the first packing was liquid silicone.

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