JP6798913B2 - Electric motor and bearing bracket - Google Patents

Description

Embodiments of the present invention relate to electric motors and bearing brackets.

When an on-shaft motor is installed outdoors, a drainage groove may be provided in the bearing bracket. As a configuration of the drainage ditch, for example, there is a configuration in which the drainage ditch is arranged radially from the shaft (for example, Patent Document 1).

According to this configuration, the drainage capacity for discharging water from the electric motor to the outside is improved, but when water enters the drainage ditch due to strong water pressure such as during heavy rain or typhoon, the drainage ditch is axially oriented. Since it is oriented, there is a problem that water may enter the motor through the gap of the shaft penetrating portion.

Japanese Unexamined Patent Publication No. 2016-116396

An embodiment has been made in view of the above problems, and provides an electric motor having an improved waterproof effect of a shaft penetrating portion and a bearing bracket used for the electric motor.

The electric motor according to the embodiment includes a rotating shaft and a through hole, and has a bearing bracket that rotatably supports the rotating shaft by penetrating the rotating shaft through the through hole and supporting the rotating shaft from above. The bearing bracket is provided around the through hole and on the protruding side of the rotating shaft, and has a convex portion formed in a disk shape concentric with respect to the through hole. The convex portion is located around the through hole and is connected to a concave portion formed concentrically with respect to the through hole and a position forming a chord of the convex portion and connected to an end portion of the concave portion. It is provided with a linear groove portion provided at a position where the bearing is formed.

Sectional drawing which shows the schematic structure of the main part of an electric motor Enlarged sectional view showing a schematic configuration of a main part of an electric motor Perspective view showing the schematic configuration of the upper part of the bearing bracket of the electric motor. Top view showing the schematic configuration of the upper part of the bearing bracket of the electric motor

Hereinafter, embodiments will be described with reference to the drawings. In the description of the embodiment, substantially the same constituent parts are designated by the same reference numerals, and the description thereof will be omitted. In the following description, the protruding direction of the rotating shaft 10 from the bearing bracket 12 is upward.

FIG. 1 is a vertical sectional view showing a schematic configuration of a main part of the electric motor 1 according to the embodiment, and FIG. 2 is an enlarged sectional view thereof. FIG. 3 is a perspective view showing a schematic configuration of a bearing bracket 12 of the electric motor 1 according to the embodiment, and FIG. 4 is a top view thereof.

The electric motor 1 illustrated in FIGS. 1 to 4 is a rotary electric motor having a stator and a rotor (not shown) inside a cylindrical electric motor main body 11 constituting the outer shell thereof. The rotating shaft 10 is integrally formed with a rotor (not shown), and is configured to rotate by an electromagnetic action. Both ends of the rotating shaft 10 are supported by support portions provided at both ends in the axial direction of the electric motor main body 11, and these support portions serve as bearing brackets 12. The electric motor main body 11 and the bearing bracket 12 are fixed by, for example, bolts 2.

The rotating shaft 10 is arranged so as to penetrate through a through hole 13 which is a shaft penetrating portion provided in the bearing bracket 12, and is rotatably supported by the bearing portion 18 provided in the bearing bracket 12. The rotating shaft 10 projects upward from the bearing bracket 12.

The bearing bracket 12 is provided with a disk-shaped convex portion 14 on the upper surface 12a side, that is, the protruding side of the rotating shaft 10. The convex portion 14 has a predetermined thickness, and has a disk shape configured to be concentric with respect to the through hole 13 provided in the central portion of the bearing bracket 12. Around the through hole 13 of the convex portion 14, a concave portion 17 which is a circular recess provided concentrically with respect to the through hole 13 is provided. In the installed state of the rotating shaft 10, the V ring 16 attached to the rotating shaft 10 is located in the recess 17, and the bottom surface of the recess 17 is the V ring sliding portion 17a. Since the V-ring sliding portion 17a also corresponds to the bottom surface of the recess 17, it may be referred to as the bottom surface 17a in the following description.

The convex portion 14 is provided with a drainage groove 20. The drainage groove 20 is a groove portion formed in a straight line having a predetermined width and depth, and is connected to the circumferential end portion of the concave portion 17 formed in a circle, and the string of the disk-shaped convex portion 14 is connected. It is a constituent position and is formed so as to be a linear recess. The drainage groove 20 does not direct the central direction of the convex portion 14, that is, the direction of the rotation axis 10. The recess 17 and the drainage groove 20 are configured to be connected. As a result, the water in the recess 17 passes through the drainage groove 20 and is discharged to the outside.

The drainage groove 20 is formed so as to open the side surface of the convex portion 14 at both ends thereof, and as shown in FIG. 4, the first end portion 21a and the second end portion 21b are formed on the side surface portion of the convex portion 14. have. The first end portion 21a and the second end portion 21b are located at both ends of the linear drainage groove 20. The first end 21a and the second end 21b are water inlets and outlets.

The bottom surface 20a of the drainage groove 20 is formed lower than the bottom surface 17a of the recess 17. This makes it easier for the liquid to flow from the recess 17 to the lower drain 20. Further, the width of the drainage groove 20 is formed so as to be about 4 mm or more. This is because if the width of the drainage groove 20 is 4 mm or less, the drainage groove 20 is clogged with water droplets due to the surface tension of water, and the drainage efficiency is lowered.

A V ring 16 is mounted on the bearing bracket 12. The V-ring 16 is fixed to the rotating shaft 10 and rotates integrally with the rotating shaft 10 when the electric motor 1 is operated. The V-ring 16 is a donut-shaped resin molded body, and has a lip 16a on the lower surface. The V-ring 16 is provided with a hole in the center thereof, and is mounted on the rotating shaft 10 so that the rotating shaft 10 penetrates the hole. The V-ring 16 is arranged in the concave portion 17 of the convex portion 14 in the assembled state of the electric motor 1, and the lip 16a is arranged in contact with the V-ring sliding portion 17a so as to slide. With this configuration, the V ring 16 suppresses the intrusion of water into the motor body 11.

The convex portion 14 of the bearing bracket 12 is covered with the upper portion of the convex portion 14 and the outer peripheral side surface portion by the disc-shaped draining collar 15. An annular wall portion 15a projecting toward the bearing bracket 12 side is provided on the outer peripheral portion of the draining collar 15, and is arranged so as to cover the end portion of the convex portion 14. As a result, the drainer collar 15 prevents water from entering the motor 1 through the through hole 13.

According to the electric motor 1 according to the embodiment described above, the following effects can be obtained.
The bearing bracket 12 is provided with a disk-shaped convex portion 14 on its upper surface 12a. The convex portion 14 has a disk shape configured to be concentric with respect to the through hole 13 provided in the central portion of the bearing bracket 12. Circular recesses 17 provided concentrically with respect to the through holes 13 are provided around the through holes 13 of the convex portion 14. The drainage groove 20 is formed so as to open the outer peripheral side surface of the convex portion 14, and has two entrances / exits, that is, a first end portion 21a and a second end portion 21b at the outer peripheral side surface portion of the convex portion 14. .. The first end portion 21a and the second end portion 21b are located at both ends of the linear drainage groove 20 and function as water inlets and outlets. The drainage groove 20 is not oriented in the central direction of the convex portion 14, that is, in the direction of the rotation axis 10.

According to this configuration, for example, when the on-axis electric motor 1 is arranged outdoors, even in a situation where rainwater easily enters due to high water pressure such as heavy rain or a typhoon, it has penetrated into the drainage ditch 20. It is suppressed that strong water pressure is directly applied to the rotation axis 10 direction (that is, the through hole 13 direction) by water. Therefore, even under a situation where rainwater enters the motor 1 due to high water pressure such as heavy rain or typhoon, strong water pressure is not applied in the direction of the rotating shaft 10, so that there is no strong water pressure between the rotating shaft 10 and the through hole 13. It is possible to prevent water from entering the motor 1 through the gap.

Further, in heavy rain or typhoon, it is difficult to assume that water will infiltrate from both sides of the first end portion 21a and the second end portion 21b due to the same strength of water pressure. Therefore, the water pressure of the water entering from the first end portion 21a and the second end portion 21b is strong on one side and weak on the other side. As in the embodiment, if the drainage groove 20 is formed in a straight line and the ends 21a and 21b serving as entrances and exits are provided at both ends thereof, drainage is performed from one of the entrances and exits (for example, the first end portion 21a). The water that has entered the groove 20 is smoothly and linearly discharged from the other entrance / exit (for example, the second end portion 21b) without being directed in the direction of the rotation axis 10. For example, as shown in FIG. 4, the water flowing from the first end portion 21a as shown by arrow A moves linearly in the drainage groove 20 without being directed in the direction of the through hole 13, and is as shown by arrow B. It is discharged from the second end 21b.

According to this configuration, even under a situation where rainwater enters at high water pressure such as heavy rain or typhoon, water is discharged from the other entrance / exit without applying water pressure in the direction of the rotation axis 10 (that is, the direction of the through hole 13). Therefore, it is possible to prevent water from entering the motor 1 through the gap between the rotating shaft 10 and the through hole 13.

Further, the drainage groove 20 is connected to the circumferential end portion of the concave portion 17 formed in a circular shape, and is notched downward from the upper surface of the convex portion 14 at a position constituting the string of the disk-shaped convex portion 14. It is formed in this way. Further, the drainage groove 20 is formed at a position that does not pass through the central portion of the circle forming the convex portion 14. Further, the width of the drainage groove 20 is formed so as to be about 4 mm or more. Therefore, the recess 17 and the drainage groove 20 are connected. Further, the bottom surface 20a of the drainage groove 20 is formed lower than the bottom surface 17a of the recess 17. The drainage ditch 20 is provided with two entrances and exits at both ends thereof.

According to this configuration, the water that has entered between the bearing bracket 12 and the draining collar 15 passes through the drainage groove 20 from the recess 17 and is discharged to the outside. Further, since the width of the drainage groove 20 is configured to be about 4 mm or more, the water can be smoothly discharged without clogging the drainage groove 20 with water due to the surface tension of the water.

Further, since the drainage ditch 20 is provided with two entrances and exits at both ends thereof, it is possible to ensure that the water infiltrated from one side is discharged from the other side, and the invaded water loses the outlet and collects inside. Suppress that. Further, since the height of the bottom surface 20a of the drainage groove 20 is lower than that of the bottom surface 17a of the recess 17, water easily flows from the recess 17 toward the drainage groove 20. Therefore, since the water that has entered the recess 17 is easily discharged to the outside through the drainage groove 20, the water that has entered the inside of the electric motor 1 can be efficiently discharged to the outside. Further, since the bottom surface 17a of the recess 17 is configured to be higher than the bottom surface 20a of the drainage groove 20, it is difficult for water in the drainage groove 20 to enter the recess 17. As a result, it is difficult for water to move in the direction of the rotating shaft 10 and the through hole 13, so that it is possible to prevent water from entering the motor 1.

The V-ring 16 is provided with a lip 16a on the lower surface, and the V-ring 16 is arranged in the concave portion 17 of the convex portion 14 when mounted on the rotating shaft 10, and the lip 16a slides on the V-ring sliding portion 17a. They are placed in contact with each other. With this configuration, the V ring 16 suppresses the intrusion of water into the motor main body 11.

An annular wall portion 15a projecting toward the bearing bracket 12 is provided on the outer peripheral portion of the draining collar 15. The drain collar 15 is arranged so as to cover the upper portion of the convex portion 14 and the outer peripheral side surface portion of the bearing bracket 12. With this configuration, the drainer collar 15 prevents water from entering the motor 1 through the through hole 13.

As described above, some embodiments of the present invention have been described, but these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

1 ... Electric motor, 10 ... Rotating shaft, 11 ... Electric motor body, 12 ... Bearing bracket, 13 ... Through hole, 14 ... Convex part, 15 ... Drain collar, 15a ... Wall part, 16 ... V ring, 16a ... Lip, 17 ... recess, 17a ... V-ring sliding part (bottom surface), 20 ... drainage groove, 20a ... bottom surface, 21a ... first doorway (doorway), 21b ... second doorway (doorway)

Claims (6)

The axis of rotation and
A bearing bracket provided with a through hole, the rotating shaft is projected through the through hole, and the rotating shaft is rotatably supported.
A drainer collar that covers the bearing bracket from above is provided.
The bearing bracket is provided around the through hole on the protruding side of the rotating shaft, and has a convex portion formed in a disk shape concentric with respect to the through hole.
The convex portion is located around the through hole, and is a position formed by a concave portion concentrically formed with respect to the through hole and a position constituting a string of the convex portion and connected to an end portion of the concave portion. An electric motor provided with a linear groove provided in. The electric motor according to claim 1, wherein the groove portion is not oriented in the direction of the rotation axis. The electric motor according to claim 1 or 2, wherein the groove portion has entrances and exits at both ends thereof. The electric motor according to any one of claims 1 to 3, wherein the width of the groove is about 4 mm or more. A bearing bracket having a through hole in the center and rotatably supporting the rotating shaft by passing the rotating shaft of the electric motor through the through hole.
Around the through hole, a convex portion formed in a disk shape concentric with respect to the through hole is provided.
The convex portion is located around the through hole and is concentrically formed with respect to the through hole, and at a position constituting the chord of the convex portion and connecting to the end of the concave portion. A bearing bracket having a linear groove provided. The bearing bracket according to claim 5, wherein the groove portion is not oriented in the through hole direction.

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