JPH0624368U - Waterproof structure in motor - Google Patents

Abstract

(57) [Abstract] [Purpose] In a motor in which a permanent magnet is fixed to a yoke that fits inside an outer cylinder, direct infiltration of water into the motor is prevented without the need for a dedicated cover member. To do. In a fan motor 1 in which a plurality of permanent magnets 6 are fixedly attached to an inner peripheral surface of a yoke fitted in a cylindrical outer cylindrical body 10, a water drain hole 10a is formed in the outer cylindrical body while a yoke is formed. The permanent magnet fixing position of 7 is set so that the drain hole is located in the gap between the adjacent permanent magnets, and the yoke is separated from the outer peripheral surface of the outer cylinder in the portion corresponding to the drain hole of the yoke. Thus, a bulging portion 7d that bulges toward the center of the cylindrical body and covers the water drainage hole is formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a waterproof structure for a motor used in vehicle electrical components and the like.

[0002]

[Problems to be Solved by Prior Art and Invention]

 In general, this type of motor is constructed by fixing a permanent magnet to the yoke, but the yoke is required to have a correspondingly thick wall in order to form a necessary magnetic path. By the way, since the yoke is generally formed by drawing a single plate material, the entire yoke is thick enough to form a magnetic path. It goes against weight reduction. Therefore, the outer cylinder is externally fitted to the yoke, and the part where the permanent magnet is fixed is made to have a structure in which the yoke and the outer cylinder are superposed (laminated) to secure the thickness necessary for forming the magnetic path. It is advisable to reduce the weight by making only the outer cylinder thin.

By the way, even in the case of the double cylinder structure as described above, it is necessary to form a drain hole for venting and draining water in the motor, but for that purpose, the outer cylinder body is drained. Drilling holes is required. In that case, it must be taken into consideration that water does not directly enter from the drain hole, but for that purpose, a separate resin cover member 13 must be attached to the drain hole. In addition, not only the number of parts increases, but for those used in a high temperature atmosphere, the deformation of the cover member due to heat becomes a problem.To avoid this, use an expensive heat-resistant resin material. It is necessary to manufacture the cover member by using the above method, which is a problem from the viewpoint of manufacturing cost.

[0004]

[Means for Solving the Problems]

 The present invention was devised in view of the above circumstances to provide a waterproof structure for a motor capable of eliminating these drawbacks. In the present invention, a yoke inside a cylindrical outer cylinder is fitted. In a motor in which a plurality of permanent magnets are integrally fixed to the peripheral surface with a gap, the outer cylinder is provided with a water drain hole, while the yoke is formed by bending a long plate member into a ring shape. In addition, the permanent magnet fixing position of the yoke is set so that the water drain hole is located in the gap between the adjacent permanent magnets. It is characterized in that a bulge portion is formed to bulge toward the center side of the cylinder so as to be separated from the peripheral surface of the cylinder and cover the drain hole.

According to this configuration, the present invention effectively fixes the permanent magnets to the yoke fitted in the outer cylinder body without the need for a dedicated cover member to directly infiltrate water. This is to prevent it.

[0006]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. In the drawing, 1 is a motor for a cooling fan, and the fan motor 1 includes a motor shaft 2, an armature core 3, a commutator 4, a brush 5, four permanent magnets 6 and a permanent magnet 6 as will be described later. The yoke 7 is fixed to the yoke 7, the outer cylinder 10 is fitted on the yoke, the end bracket 8 on which the brush 5 is assembled, and other various component devices. The outer cylinder 10 and the end bracket 8 are also provided. It is conventionally formed by integrally attaching the fan boss portion 9 having the plurality of blades 9a to the end portion of the motor shaft 2 protruding from the casing A thus configured.

An outer cylinder body 10 having a bottomed cylindrical shape is fitted on the outer peripheral surface of the yoke 7. The outer cylinder body 10 is directly below when the fan motor 1 is attached to the body. Drainage holes 10a are formed corresponding to the positions. Incidentally, since the yoke 7 forms a magnetic path, it is necessary to form the yoke 7 with a ferromagnetic material such as iron, but the outer cylindrical body 10 may be formed with a non-magnetic material such as aluminum or a resin material. . In this case, it is necessary to make the plate thickness of the yoke 7 a thickness necessary for forming the magnetic path. On the other hand, when the outer cylinder body 10 is made of a ferromagnetic material, the magnetic path is formed by the laminated body of the outer cylinder body 10 and the yoke 7, which gives the appearance of the casing. The plate thickness of the body 10 can be reduced by the plate thickness of the yoke 7.

On the other hand, the yoke 7 is formed by bending a long plate body in a ring shape and facing each other with both ends slightly spaced apart from each other. After being fitted in the outer tubular body 10 in the contracted state, the elastic restoring force accompanying the opening of the contracted state of the yoke 7 causes the outer tubular body 10 to be fitted in the retaining state. . A pair of left and right magnet receiving pieces 7a, 7b for positioning one end of the permanent magnet 6 are formed in the yoke 7 in a state of being displaced by about 180 degrees, and the other side of the permanent magnet 6 is cut. A guide projection 7c is formed for inserting and removing the magnet holder 11 for positioning and holding the end portion and assembling it in the yoke 7. The permanent magnet 6 is formed by these magnet receiving pieces 7a and 7b and the magnet holder 11. Is received and supported, and is integrally fixed to the inner peripheral surface of the yoke. Then, in one of the magnet receiving pieces 7a, a portion corresponding to the drain hole 10a is expanded toward the center side of the cylindrical body so as to cover the drain hole while being separated from the inner peripheral surface of the outer cylindrical body 10. The protruding portion 7d is formed. By the way, in this structure, the opposing positions of the both ends of the yoke 7 are just the center positions of the permanent magnets 6, and therefore there is no hindrance to the formation of the magnetic path.

In the embodiment of the present invention constructed as described above, first, the yoke 7 is so arranged that the bulging portion 7 d of the yoke 7 covers the drain hole 10 a formed in the inner peripheral surface of the outer cylindrical body 10. Then, the permanent magnet 6 and the magnet holder 11 are attached to the yoke 7. In this way, the bulging portion 7 d of the yoke 7 is used to prevent the intrusion of water from the water draining hole 10 a formed in the outer cylinder body 10. A motor can be assembled by assembling the end bracket 8 with a brush, which is separately assembled, to the cylindrical body 10. Further, the fan motor is assembled by fixing the fan boss portion 9 to the motor shaft 2a.

Therefore, when the yoke 7 is fitted into the outer cylindrical body 10, the bulging portion 7d is fitted so as to correspond to the position of the water drain hole 10a. It is possible to prevent direct infiltration of water, and effective waterproofing is possible without using a special cover member. Moreover, since the bulging portion 7d is formed in the gap between the pair of permanent magnets 6, there is no influence on the attachment of the permanent magnets 6 to the yoke 7.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and the shape of the bulging portion 7d is changed from one side edge to the other side edge of the yoke 7 as in the above-mentioned embodiment. It is not necessary to form a groove shape (in this case, there is no directionality of the yoke, and the yoke may be fitted on either side), and as shown in FIG. 4, it is formed only on one side edge of the yoke 7. It may be of any type, as long as it is formed so as to correspond to the water draining hole 10 a formed in the outer cylindrical body 10.

[0012]

[Operation effect]

 In short, since the present invention is configured as described above, when fitting the yoke to the outer cylinder, the bulging portion formed on the yoke is positioned at the drainage hole position formed in the outer cylinder. It is possible to prevent water from directly entering the inside of the yoke through the water draining hole by fitting in correspondence with the above. As a result, effective waterproofing can be performed without using a special cover member. Moreover, since the bulging portion is formed in the gap between the permanent magnets fixed to the yoke, there is no effect on the attachment of the permanent magnets to the yoke.

[Brief description of drawings]

FIG. 1 is a sectional view of a motor.

FIG. 2 is a main part front view showing a state in which a yoke is attached to an outer cylinder.

FIG. 3 is a side sectional view of a main part of the same.

FIG. 4 is a main part perspective view showing another example of the bulging part.

FIG. 5 is a front view of a main part showing a conventional example.

FIG. 6 is a side view of a main part showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor 6 Permanent magnet 7 Yoke 7d Bulging part 10 Outer cylinder 10a Water drainage hole

Claims (1)

[Scope of utility model registration request] 1. In a motor in which a plurality of permanent magnets are integrally fixed to an inner peripheral surface of a yoke fitted in a cylindrical outer cylinder body with a gap, the water drainage hole is formed in the outer cylinder body. While setting up,
The yoke is formed by bending a long plate material into a ring shape, and the permanent magnet fixing position of the yoke is set such that the drain hole is located in the gap between the adjacent permanent magnets. Further, the portion corresponding to the water drain hole of the yoke is formed with a bulge portion that bulges toward the center of the cylinder to cover the water drain hole so that the yoke is separated from the outer circumferential surface of the outer cylinder body. Construction.