KR101658095B1 - Electric motor assembly having reducer - Google Patents

Abstract

The present invention relates to a motor assembly having a speed reducer, comprising: a motor having a motor frame, a stator provided inside the motor frame, and a rotor having a motor shaft extending outside the motor frame; A speed reducer case coupled to the motor such that an extended end of the motor shaft is received therein, and a plurality of gears provided inside the speed reducer case; An oil seal interposed between the motor frame and the motor shaft to prevent inflow of oil into the motor frame; And a collecting magnet provided around the oil seal or the oil seal and collecting the flour by a magnetic force. As a result, the oil can be prevented from flowing into the inside of the motor due to the flour.

Description

ELECTRIC MOTOR ASSEMBLY HAVING REDUCER < RTI ID = 0.0 >

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a motor assembly having a speed reducer, and more particularly, to a motor assembly having a speed reducer capable of suppressing the inflow of speed reducer oil into the interior of the motor.

As is well known, motors are devices that convert electrical energy into mechanical energy.

The motor includes a motor frame, a stator disposed inside the motor frame, and a rotor rotatably disposed on the stator.

Meanwhile, a part of the motor is constituted by a motor assembly having a speed reducer so as to be able to decelerate and output the rotation output.

The speed reducer includes a case and a plurality of gears provided inside the case and rotating in engagement with each other.

The casing of the speed reducer is provided with oil for lubricating and / or cooling the plurality of gears.

An oil seal is provided between the motor frame and the motor shaft so as to prevent the oil of the speed reducer from flowing into the motor frame.

However, in the motor assembly with such a conventional speed reducer, the oil of the speed reducer includes the flour generated by the abrasion of the gear and is circulated together with the oil. As a result, the flour is transferred between the oil seal and the motor frame There is a problem that the possibility of leakage of the oil is increased because the oil seeps into and flows between the motor shaft and the oil seal to increase the clearance.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a motor assembly having a reducer capable of restraining oil from flowing into the interior of a motor due to flour.

Another object of the present invention is to provide a motor assembly provided with a speed reducer capable of suppressing leakage of oil from a speed reducer due to flour.

Another object of the present invention is to provide a motor assembly having a reducer capable of suppressing abrasion of bearings due to flour.

It is still another object of the present invention to provide a motor assembly having a reducer capable of easily collecting dust particles in oil.

In order to achieve the above object, the present invention provides a motor including a motor frame, a stator provided inside the motor frame, and a rotor having a motor shaft extended to the outside of the motor frame; A speed reducer case coupled to the motor such that an extended end of the motor shaft is received therein, and a plurality of gears provided inside the speed reducer case; An oil seal interposed between the motor frame and the motor shaft to prevent inflow of oil into the motor frame; And a collecting magnet provided around the oil seal or the oil seal and collecting the flour by a magnetic force.

Here, the oil seal may include a shaft receiving portion in which the motor shaft is received, and a blocking portion extending outside the shaft receiving portion to block the gap between the motor frame and the shaft receiving portion.

The collecting magnet may include a first collecting magnet provided in the blocking portion.

The oil seal may further comprise a support member for supporting the blocking portion.

The support member may be provided with a coupling portion to allow the first collection magnet to be coupled thereto.

In addition, the first collecting magnet may be provided between the blocking portion and the supporting member.

The support member may be formed of a magnetic material.

The oil seal may have a receiving space opened toward the speed reducer side and the first collecting magnet may be arranged to be spaced apart from the opening of the receiving space inside the receiving space along the axial direction.

The rotor may include a rotor core and a rotor coil wound around the rotor core.

A brush for supplying power to the rotor coil may be provided on one side of the motor shaft.

The oil seal includes a first oil seal for blocking oil flowing into the motor frame from the speed reducer side and a second oil seal for blocking oil flowing into the motor frame from the opposite side of the speed reducer .

The motor shaft may have a hollow portion penetrating the motor shaft along the longitudinal direction.

A drive shaft connected to the speed reducer on one side can be rotatably inserted into the motor shaft.

The collecting magnet may further include a second collecting magnet disposed on the periphery of the second oil seal or the second oil seal to suppress the inflow of dust between the second oil seal and the motor shaft.

A second collecting magnet receiving portion may be provided on one side of the second oil seal to receive the second collecting magnet.

The second collecting magnet accommodating portion may be recessed along the radial direction on the outer surface of the motor shaft.

The drive shaft may have an elongated length extending to the outside of the motor shaft.

And a driving shaft bearing for supporting the driving shaft may be provided on the outer side of the second oil seal along the axial direction.

The bearing support may be provided on the outer side of the oil seal along the axial direction so that the bearing supporting the motor shaft can be received.

An oil groove may be formed in the bearing support portion so that the oil of the reduction gear can be circulated.

The collecting magnet may further include a bearing magnet provided on one side of the bearing along the axial direction to suppress movement of the flour from the speed reducer side to the bearing side.

The bearing magnet may be provided outside the oil groove along the radial direction.

The bearing magnet may be provided on one side or both sides of the oil groove along the circumferential direction.

The bearing magnet may be provided at an entrance of the reduction gear of the bearing support.

The bearing magnet may be configured to have a ring shape.

The bearing support portion may include a bearing magnet receiving portion extended to receive the bearing magnet.

The inner diameter of the bearing magnet accommodating portion may be larger than the inner diameter of the bearing supporting portion.

The bearing magnet accommodating portion may be configured to have an expanded width in comparison with the axial width of the bearing magnet.

As described above, according to the embodiment of the present invention, the collection magnet is provided on one side of the oil seal to suppress the inflow of the dust between the oil seal and the motor shaft, so that the leakage of the oil due to the dust- have.

In addition, it is possible to prevent the oil of the speed reducer from flowing into the inside of the motor due to the flour.

Further, by providing the bearing magnet at the entrance of the bearing support portion, it is possible to suppress the wear of the bearings due to the fly powder.

Further, by forming the support member of the oil seal with a magnetic material and bringing the support member into contact with the collection magnet, it is possible to increase the contact area with the oil, thereby facilitating the collection of the flour in the oil.

Further, by forming the support member of the oil seal with a magnetic material and bringing it into contact with the collection magnet, the amount of magnets can be reduced.

Further, by providing the bearing magnet on the outer side of the bearing along the axial direction, it is possible to suppress the movement of the flour toward the bearing in advance.

1 is a cross-sectional view of a motor assembly having a speed reducer according to an embodiment of the present invention,
Fig. 2 is an enlarged view of the first oil seal region in Fig. 1,
Figure 3 is an enlarged view of the first oil seal of Figure 2,
4 is an enlarged view of the main part of Fig. 3,
Fig. 5 is a view showing a modification of the first collecting magnet of Fig. 1,
Fig. 6 is an enlarged view of the bearing magnet region of Fig. 2,
FIG. 7 is a perspective view of the bearing magnet region of FIG. 2,
8 is a modification of the bearing magnet of Fig. 2,
FIG. 9 is a perspective view of the bearing magnet region of FIG. 8,
FIG. 10 is a modification of the bearing magnet region of FIG. 2,
11 is a perspective view of the bearing magnet region of FIG. 10,
Fig. 12 is an enlarged view of the second oil seal region in Fig. 1,
13 is an enlarged view of the second oil seal and the second collecting magnet region in Fig. 13,
Fig. 14 is an enlarged view of the main part of the second collecting magnet of Fig. 13;

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1, a motor assembly having a speed reducer according to an embodiment of the present invention includes a motor frame 120, a stator 150 provided inside the motor frame 120, (110) having a rotor (160) having a motor shaft (171) extending to the outside of the rotor (120); A speed reducer case 215 coupled to the motor 110 such that an extended end of the motor shaft 171 is received therein and a plurality of gears 222 provided in the speed reducer case 215, (210); An oil seal 240 interposed between the motor frame 120 and the motor shaft 171 to prevent inflow of oil into the motor frame 120; And a dust collecting magnet or a collecting magnet 270 (hereinafter referred to as a collecting magnet 270) provided around the oil seal 240 or the oil seal 240 and collecting the flour by a magnetic force. .

The motor frame 120 may have a receiving space therein.

The motor frame 120 may have a cylindrical shape, for example.

The motor frame 120 may have a cylindrical shape, for example, at least one side of which is open.

The motor frame 120 can be realized, for example, in a cylindrical shape with both sides open.

Hereinafter, the case where the motor frame 120 of the present embodiment has a cylindrical shape with both sides open is described as an example.

Although the motor frame 120 is not shown in the drawings, the motor frame 120 may include a through-hole formed in a circumferential surface thereof so that air can be sucked and discharged.

A stator 150 may be provided inside the motor frame 120.

The stator 150 may include a stator core 153 and a stator coil 155 wound on the stator core 153, for example.

The stator core 153 may include a space for receiving the rotor 160 at the center thereof.

The stator core 153 can be formed by, for example, insulative lamination of a plurality of electrical steel sheets.

The stator coil 155 may be configured to form a rotating magnetic field, for example, when power is supplied.

The rotor 160 may include a rotor core 163 and a rotor coil 165 wound on the rotor core 163.

The rotor core 163 may be formed by, for example, insulating and laminating a plurality of electrical steel sheets.

The rotor 160 may be provided with a motor shaft 171.

The motor shaft 171 may be configured to have, for example, a hollow 173 therein.

The motor shaft 171 may be provided with a fan 180 for rotating the motor shaft 171 while promoting the flow of air.

The fan 180 may be, for example, an axial flow fan that causes air to move along the axial direction.

The fan 180 includes a hub 183 coupled to the motor shaft 171 and a plurality of rotary blades 184 protruding radially from the hub 183 and spaced apart from each other in the circumferential direction 185).

The fan 180 may include a first fan 181a and a second fan 181b disposed on both sides of the rotor 160, for example.

Meanwhile, the motor frame 120 may include a bracket 130 coupled to an end thereof.

The bracket 130 may include a first bracket 131a and a second bracket 131b coupled to both ends of the motor frame 120, respectively.

More specifically, the motor frame 210 and the first bracket 131a may be formed with fastening member engaging portions 128 and 138, respectively, so that the fastening members 139 are simultaneously engaged.

The second bracket 131b may be provided with a fastening member engaging portion so as to be fastened to the motor frame 210 in the same manner as the first bracket 131a.

Each of the brackets 131a and 131b may be formed with an axial coupling portion 134 so that the motor shaft 171 can be received and coupled, respectively.

The brackets 131a and 131b may be provided with bearings 126 for supporting the motor shaft 171, respectively.

Each of the brackets 131a and 131b may be provided with a bearing support 136 so that the bearing 126 can be received.

The motor shaft 171 may have a length longer than that of the motor frame 120, for example.

More specifically, for example, the motor shaft 171 may be configured to extend from both ends of the motor frame 120 to both sides along the axial direction.

For example, a speed reducer 210 may be provided on one side of the first bracket 131a.

The speed reducer 210 includes a speed reducer case 215 coupled to the motor 110 so that an extended end of the motor shaft 171 is received therein and a speed reducer And a plurality of gears 222, which are arranged in parallel.

The speed reducer case 215 may be formed, for example, to have one side opened.

The speed reducer case 215 may be configured to be coupled with the motor frame 120 (the first bracket 131a) to form a closed space 217 therein, for example.

The opening of the speed reducer case 215 may be blocked by the first bracket 131a.

The bearing support portion 136 of the first bracket 131a may communicate with the interior of the speed reducer case 215. [

A cover 128 may be provided on the bearing support 136 of the first bracket 131a.

Oil may be filled in the inside of the speed reducer case 215 (the closed space 217).

Thereby, cooling and lubrication of the plurality of gears 222 and / or the bearings 126 can be promoted.

The plurality of gears 222 may include input gears 223 that are integrally and rotatably coupled to the motor shaft 171, for example, as shown in FIG.

The input gear 223 may be rotated at the same rotational speed as the motor shaft 171.

Of the plurality of gears 222, the remaining gears 224 other than the input gear 223 may be configured to be engaged with each other and rotated, for example.

The plurality of gears 222 may be respectively configured to be rotated at a predetermined reduction ratio, for example.

A drive shaft 190 connected to the final one of the remaining gears 224 may be provided on the inside of the motor shaft 171 (hollow 173).

The driving shaft 190 may have an outer diameter smaller than an inner diameter of the hollow 173 of the motor shaft 171.

Oil may be introduced between the motor shaft 171 and the drive shaft 190 (space).

More specifically, oil may flow into the space between the motor shaft 171 and the drive shaft 190 from the second bracket 131b side.

The drive shaft 190 may be rotated at a reduced rotational speed, for example, as compared with the motor shaft 171.

The driving shaft 190 may have a length longer than the length of the motor shaft 171, for example.

The drive shaft 190 may extend outward from both ends of the motor shaft 171.

The driving shaft 190 is connected to a speed reducer 210 provided at one end of the motor shaft 171 and rotates at a reduced rotational speed relative to the motor shaft 171, The power of the motor 110 can be transmitted at a reduced speed.

An oil seal 240 may be provided between the motor frame 120 and the motor shaft 171.

Thus, the oil outside the motor frame 120 can be prevented from flowing into the motor frame 120 through the space between the motor frame 120 and the motor shaft 171.

The oil seal 240 includes a first oil seal 245a for blocking the oil flowing into the motor frame 120 from the speed reducer 210 side and a second oil seal 245b on the opposite side of the speed reducer 210, And a second oil seal 245b for blocking the oil flowing into the motor frame 120. [

The oil seal 240 may be formed of an elastic member (e.g., a rubber member or a silicon member).

Since the first oil seal 245a and the second oil seal 245b have the same configuration, the first oil seal 245a will be described below.

The first oil seal 245a may be provided on the bracket 130 (the first bracket 131a) adjacent to the speed reducer case 215. [

As a result, the oil of the speed reducer 210 can be prevented from flowing into the motor 110.

The first oil seal 245a may be provided between the first bracket 131a and the motor shaft 171, for example.

Accordingly, the oil of the speed reducer 210 can be prevented from flowing into the motor frame 120 through the space between the first bracket 131a and the motor shaft 171.

The first oil seal 245a may be inserted into the shaft coupling portion 134 of the first bracket 131a.

A bushing 268 may be provided between the first oil seal 245a and the motor shaft 171, for example.

3, the first oil seal 245a is extended to the outside of the shaft receiving portion 247 and the shaft receiving portion 247 in which the motor shaft 171 is received, And a blocking portion 255 for blocking the frame 120 and the shaft receiving portion 247.

The shaft receiving portion 247 may have a substantially cylindrical shape.

The shaft receiving portion 247 may include a plurality of inclined portion portions 249a, 249b, and 249c that are inclined with respect to the axial direction of the motor shaft 171, for example.

A pressing member 251 may be provided on the outer surface of the shaft receiving portion 247 to press the shaft receiving portion 247 against the motor shaft 171.

The pressing member 251 may be, for example, a spring.

The pressing member 251 may be configured to have a ring shape with one side opened to enable elastic deformation.

Accordingly, the shaft receiving portion 247 can be brought into close contact with the outer surface of the motor shaft 171 by pressing the shaft receiving portion 247 while being elastically deformed so that the radius of the pressing member 251 is reduced.

Further, the pressing member 251 may be realized as a ring-shaped spring which can be expanded and contracted in the circumferential direction.

The pressing member 251 may be provided in a boundary region between two inclined section sections 249a and 249b that are inclined to the outside of the motor shaft 171. [

The blocking portion 255 of the first oil seal 245a may include a radial section 257 extending in the radial direction on the outer surface of the shaft receiving section 247 and a radial section 257 extending in the radial section 257, And a circumferential section 258 extending in the axial direction from an outer end of the circumferential section 258.

The circumferential section 258 may be in close contact with the inner circumferential surface of the shaft coupling part 134 of the first bracket 131a.

The blocking portion 255 may be implemented in a substantially inverted "L"

More specifically, the radial section 257 of the first oil seal 245a may extend along the radial direction from one end of the shaft receiving section 247.

The circumferential section 258 of the first oil seal 245a extends from the outer end of the radial section 257 along the axial direction and extends to a position corresponding to the other end of the shaft receiving section 247 .

Accordingly, a receiving space 259 having one side opened can be formed between the outer surface of the shaft receiving portion 247 and the blocking portion 255.

The accommodation space 259 between the shaft receiving portion 247 and the blocking portion 255 of the first oil seal 245a may be opened to the speed reducer 210 side.

The first oil seal 245a may include a support member 260 for supporting the blocking portion 255.

The support member 260 may be formed of a rigid member (for example, a metal member or a synthetic resin member) having an excellent shape retaining strength as compared with the oil seal 240, for example.

The support member 260 may be formed of, for example, a magnetic material.

The support member 260 may be configured to have a reduced size as compared with the blocking portion 255, for example.

The supporting member 260 may be disposed inside the radius section 257 and the circumference section 258 of the blocking section 255 as shown in FIG.

The first oil seal 245a may be formed with a support portion recombining portion 262 so that the support member 260 can be engaged with the first oil seal 245a.

The support part recombination part 262 may be recessed in the thickness direction of the blocking part 255.

The supporting unit 260 may be provided with a protrusion 263 protruding from the supporting member 260 so as to be able to contact with the outside of the supporting member 260.

As a result, the support member 260, which is inserted and coupled into the support portion recombination portion 262, can be prevented from being unintentionally separated.

The projecting portion 263 may be configured to have a ring shape extending along the circumferential direction of the shaft receiving portion 247, for example.

In the present embodiment, the protrusions 263 are formed in a ring shape. However, the protrusions 263 may be formed in a plurality of circumferentially spaced apart widths in the circumferential direction.

Meanwhile, the first oil seal 245a may be provided with a collecting magnet 270 collecting the flour by a magnetic force.

The collecting magnet 270 may include, for example, a first collecting magnet 271a provided in the first oil seal 245a.

This can reduce the adverse effects caused by the flour produced by the plurality of gears 222 rotated by intermeshing of the speed reducer 210.

More specifically, the inflow of flour into the motor frame 120 can be suppressed.

In addition, it is possible to prevent the flour from flowing into and accumulating between the oil seal 240 and the motor shaft 171, thereby preventing a gap between the oil seal 240 and the motor shaft 171 from being spread by the flour The possibility of the oil flowing in through the gap may be reduced.

In addition, it is possible to suppress the forced wear of the bearing 126 due to the flour contained in the oil.

The first collecting magnet 271a may include a body 273 and a protrusion 275 protruding from one side of the body 273.

The body 273 may have, for example, a rectangular cross section.

The first collecting magnet 271a may be provided in the blocking portion 255 of the first oil seal 245a, for example. The first collecting magnet 271a may be disposed in the blocking portion 255 so as to be spaced apart from the opening of the receiving space 259 in the receiving space 259 of the first oil seal 245a.

The first collecting magnet 271a may be provided on the support member 260, for example.

The supporting member 260 may be provided with a coupling portion 261, for example, so that the first collecting magnet 271a can be coupled thereto.

The engaging portion 261 may have a shape corresponding to the shape of the protrusion 275 so that the protrusion 275 of the first collecting magnet 271a may be inserted.

Thereby, the relative movement of the first collecting magnet 271a can be suppressed.

When the supporting member 260 is formed of a magnetic material, the supporting member 260 forms a magnetic path of the first collecting magnet 271a when the first collecting magnet 271a is engaged. So that the contact area with the oil can be increased.

As a result, the dust collecting efficiency of the fine particles in the oil of the speed reducer 210 can be increased.

As shown in Fig. 5, the first collecting magnet 271b may be configured to have a thin rectangular cross-sectional shape.

The first collecting magnet 271b may be provided between the blocking portion 255 of the first oil seal 245a and the support member 260. [

Here, although the support member 260 is formed of a non-magnetic material, it can collect the flour, but when it is formed of a magnetic material, the flour can be collected more effectively.

At least one of the first oil seal 245a and the support member 260 may be provided with a first trapping magnet accommodating portion 264 to accommodate the first trapping magnet 271b.

In this embodiment, the case where the first trap magnet receiving portion 264 is formed in the blocking portion 255 of the first oil seal 245a is illustrated, but it may be formed in the support member 260 as well.

Although not shown in the figure, the first oil seal 245a and the support member 260 may be formed to have a thickness of the first collecting magnet 271b so as to partially accommodate the first collecting magnet 271b, The first collecting magnet receiving portion may be formed to be recessed corresponding to half of the first collecting magnet receiving portion.

6, the trap magnet 270 may include a bearing magnet 281a that prevents the powder from moving toward the bearing 126 from the speed reducer 210 side. have.

The bearing magnet 281a may be configured to have, for example, a substantially rectangular parallelepiped shape.

The bearing magnet 281a may be provided on the first bracket 131a.

As a result, it is possible to suppress the occurrence of forced wear of the bearing 126 due to flour.

The first bracket 131a may be provided with a bearing magnet receiving portion 145 to receive the bearing magnet 281a.

The bearing magnet receiving portion 145 may be provided on one side of the bearing support portion 136, for example.

The bearing support 136 of the first bracket 131a may be provided with an oil groove 140 which is recessed outwardly along the radial direction and extends in the axial direction, as shown in FIG.

The oil grooves 140 may have a plurality of oil grooves.

The oil grooves 140 may be disposed at equal intervals along the circumferential direction of the bearing support 136, for example.

In this embodiment, two oil grooves 140 are formed at mutually opposed positions, but the number of oil grooves 140 can be appropriately adjusted.

According to such a configuration, the oil of the speed reducer case 215 can be smoothly supplied to the bearing 126.

Thereby, cooling and lubrication of the bearing 126 can be promoted.

The bearing magnet receiving portion 145 may be provided on one side of the oil groove 140.

More specifically, for example, the bearing magnet receiving portion 145 may be provided outside the oil groove 140 along the radial direction of the bearing support portion 136.

As a result, the capture of the flour contained in the oil flowing in and out along the oil groove 140 can be smoothly performed.

That is, the flour in the oil flowing along the oil groove 140 can be attached to the recessed bottom surface 142a of the oil groove 140 by the magnetic force of the bearing magnet 281a and collected.

As a result, abrasion in the oil of the speed reducer 210 is suppressed from contacting with the bearing 126 during lubrication and cooling of the bearing 126, so that occurrence of forced wear of the bearing 126 can be suppressed.

Here, the bearing magnet 281a may be provided along at least one side 142b of the oil groove 140.

8 and 9, the bearing magnet 281a may be provided on both sides 142b of the oil groove 140, respectively.

According to this configuration, the flour in the oil moving along the oil groove 140 can be attracted to both sides 142b of the oil groove 140 by magnetic force and collected.

10 and 11, the bearing magnet 281b may be provided at the entrance side of the bearing support 136. [

More specifically, for example, at the entrance of the bearing support 136, a bearing magnet receiving portion 146 may be formed to receive the bearing magnet 281b.

The bearing magnet receiving portion 146 may be configured to extend radially from the inner diameter surface 137a of the bearing support portion 136 and extend along the circumferential direction.

The bearing magnet 281b may be formed in a ring shape, for example.

The bearing magnet 281b may have, for example, a rectangular cross-sectional shape.

In this embodiment, the bearing magnet 281b has a rectangular cross section, but may have a circular cross section.

The bearing magnet receiving portion 146 may be configured to have a longer length in the axial direction than, for example, the bearing magnet 281b.

The bearing magnet receiving portion 146 may have a larger radial width than the radial width of the bearing magnet 281b, for example.

Thus, a dust collecting space 147a can be formed in the radial direction of the bearing magnet 281b.

A dust collecting space 147b may be formed on one side of the bearing magnet 281b along the axial direction.

According to this configuration, even when dust is collected around the bearing magnet 281b, it is possible to reduce the occurrence of movement resistance due to the dust collected during movement of the oil moving between the speed reducer 210 and the bearing 126. [

The second bracket 131b may be provided with a drive shaft bearing 191 for supporting the drive shaft 190.

As shown in FIG. 12, the second bracket 131b may be provided with a drive shaft bearing support portion 139 for receiving and supporting the drive shaft bearing 191.

The drive shaft bearing support 139 may be spaced axially from the bearing support 136 of the second bracket 131b.

The second bracket 131b may be provided with a brush 176 for supplying power to the rotor coil 165.

The brush 176 may be disposed between the bearing 126 of the second bracket 131b and the drive shaft bearing 191, for example.

The second bracket 131b may be provided with a brush accommodating space 148 between the bearing 126 of the second bracket 131b and the drive shaft bearing 191, for example.

The motor shaft 171 may be provided with a slip ring 175 that contacts the brush 176, for example.

The slip ring 175 may be connected to the rotor coil 165 to transmit a power supplied from the brush 176 to the rotor coil 165.

The second bracket 131b may be provided with a second oil seal 245b.

As a result, the oil can be prevented from flowing outside through the gap between the second bracket 131b and the motor shaft 171 outside the motor frame 120.

12, the second oil seal 245b includes a shaft receiving portion 247 in which the motor shaft 171 is accommodated, and a second oil seal 244 which is extended outside the shaft receiving portion 247, 120) and the shaft receiving portion (247).

The second oil seal 245b may be provided with a pressing member 251.

Since the second oil seal 245b has the same configuration as that of the first oil seal 245a as described above, a further detailed description will be omitted.

The collecting magnet 270 may include a second collecting magnet 290 provided on one side of the second oil seal 245b.

The second collecting magnet 290 may be provided outside the second oil seal 245b along the axial direction, for example.

As a result, the inflow and / or accumulation of the flour in the oil is suppressed by a gap between the motor shaft 171 and the oil seal (second oil seal 245b), whereby the motor shaft 171 and the oil seal (The second oil seal 245b) is prevented from being widened so that the inflow of oil through the gap can be suppressed.

Meanwhile, the collecting magnet 270 may include a second collecting magnet 290 provided on one side of the second oil seal 145b.

The second collecting magnet 290 may be provided on the outer side of the second oil seal 145b along the axial direction, for example.

The second collecting magnet 290 may be provided on the motor shaft 171, for example.

The motor shaft 171 may be provided with a second collecting magnet receiving portion 192 so that the second collecting magnet 290 can be received, for example, as shown in FIG.

The second trapping magnet accommodating portion 192 may be recessed along the radial direction on the outer surface of the motor shaft 171, for example.

The second trapping magnet accommodating portion 192 may be embodied as a circular groove recessed in the radial direction and extending in the circumferential direction, for example, on the outer surface of the motor shaft 171.

The second collecting magnet 290 may be embodied in a ring shape, for example.

The second collecting magnet 290 may be embodied as, for example, a soft plastic magnet or a rubber magnet.

As a result, the second collection magnet 290 can be easily coupled.

The second collecting magnet 290 may be formed, for example, in a rectangular cross-sectional shape.

14, the second collecting magnet receiving portion 192 is configured to have a length L1 larger than the axial length L2 of the second collecting magnet 290 .

The second trapping magnet receiving portion 192 may be configured to have a thickness (width W1) larger than a radial thickness (width W2) of the second trapping magnet 290, for example.

Here, the width W1 of the second oil magnet accommodating portion may be about 50% to 100% of the width W2 of the second trap magnet 290.

Thus, a dust collecting space 193a can be formed inside the second collecting magnet 290.

The length L1 of the second trapping magnet accommodating portion 192 may be about 50% to 150% of the length L2 of the second trapping magnet 290.

Thus, a dust collecting space 193b can be formed on one side of the second collecting magnet 290 in the axial direction.

When the power is supplied to the stator coil 155 and the rotor coil 165, the rotor 160 (160) is rotated by the magnetic force generated by the stator coil 155 and the rotor coil 165, May be rotated about the motor shaft 171. [

When the motor shaft 171 is rotated, the speed reducer 210 can transmit the rotational force of the motor shaft 171 to the drive shaft 190 at a predetermined speed reduction ratio.

Meanwhile, the oil inside the speed reducer case 215 may be introduced and / or discharged through the oil groove 140 to lubricate and cool the bearing 126 of the first bracket 131a.

At this time, the flour in the oil moving along the oil groove 140 can be collected by the magnetic force of the bearing magnet 281a.

Thus, the flour contained in the oil of the speed reducer 210 can be reduced.

In addition, the magnetic particles of the oil transferred from the speed reducer 210 to the first oil seal 245a can be collected by the magnetic force of the first collecting magnet 271a.

On the other hand, oil may flow into the space between the motor shaft 171 and the drive shaft 190 from the outside of the second bracket 131b.

The second oil seal 245b can prevent oil from flowing into the motor frame 120 through the space between the motor shaft 171 and the second bracket 131b.

The second collecting magnet 290 can collect the dust in the oil flowing between the motor shaft 171 and the drive shaft 190.

The foregoing has been shown and described with respect to specific embodiments of the invention. However, the present invention may be embodied in various forms without departing from the spirit or essential characteristics thereof, so that the above-described embodiments should not be limited by the details of the detailed description.

Further, even when the embodiments not listed in the detailed description have been described, it should be interpreted broadly within the scope of the technical idea defined in the appended claims. It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

110: motor 120: motor frame
126: Bearing 130: Bracket
131a: first bracket 131b: second bracket
134: shaft coupling portion 136: bearing support portion
139: drive shaft bearing support part 140: oil groove
145, 146: Bearing magnet accommodating portion
147a, 147b, 193a, 193b:
150: stator 153: stator core
155: stator coil 160: rotor
163: rotor core 165: rotor coil
171: motor shaft 173: hollow
175: Slip ring 176: Brush
180: fan 181a: first fan
181b: second fan 183: hub
185: rotating blade 190: drive shaft
191: drive shaft bearing 192: second collecting magnet accommodating portion
210: Reducer 215: Reducer case
222: plurality of gears 223: input gear
240: Oil seal 245a: First oil seal
245b: second oil seal 247: shaft receiving portion
249a, 249b, 249c: an inclined section 255:
257: Radius section 258: Circumference section
260: support member 261:
262: support part recombination part 263:
270: collecting magnet 271a, 271b: first collecting magnet
281a, 281b: bearing magnet 290: second collecting magnet

Claims (19)

A motor having a motor frame, a stator provided inside the motor frame, and a rotor having a motor shaft extended to the outside of the motor frame;
A speed reducer case coupled to the motor such that an extended end of the motor shaft is received therein, and a plurality of gears provided inside the speed reducer case;
An oil seal interposed between the motor frame and the motor shaft to prevent inflow of oil into the motor frame; And
And a collecting magnet provided around the oil seal or the oil seal and collecting the flour by a magnetic force,
The oil seal includes a shaft receiving portion in which the motor shaft is received and a blocking portion extending outwardly of the shaft receiving portion to block the gap between the motor frame and the shaft receiving portion,
Wherein the collecting magnet includes a first collecting magnet provided in the blocking portion. The method according to claim 1,
Wherein the blocking portion includes a radial section extending from one end of the shaft receiving section in a radial direction and a circumferential section extending from the radial section to be spaced apart from the shaft receiving section,
Wherein the first trapping magnet is provided in the radial section. The method according to claim 1,
The oil seal further includes a support member for supporting the blocking portion,
Wherein the support member is provided with a coupling portion for coupling the first collection magnet. The method according to claim 1,
The oil seal further includes a support member for supporting the blocking portion,
Wherein the first collecting magnet is provided between the blocking portion and the supporting member. 5. The method of claim 4,
Wherein the supporting member is a magnetic body. The method according to claim 1,
Wherein the oil seal has an accommodation space opened toward the speed reducer,
Wherein the first collecting magnet is disposed in the interior of the accommodating space along the axial direction, away from the opening of the accommodating space. 7. The method according to any one of claims 1 to 6,
Wherein the rotor includes a rotor core and a rotor coil wound around the rotor core,
A brush for supplying power to the rotor coil is provided on one side of the motor shaft,
The oil seal includes a first oil seal for blocking oil flowing into the motor frame from the speed reducer side and a second oil seal for blocking oil flowing into the motor frame from the opposite side of the speed reducer Wherein the motor is a motor. 8. The method of claim 7,
Wherein the motor shaft is provided with a hollow portion penetrating the motor shaft along its longitudinal direction,
A drive shaft connected to the speed reducer is rotatably provided at one side of the motor shaft,
Wherein the collecting magnet includes a second collecting magnet disposed on the periphery of the second oil seal or the second oil seal to suppress the inflow of dust between the second oil seal and the motor shaft. 9. The method of claim 8,
And a second collecting magnet receiving portion is provided on one side of the second oil seal to receive the second collecting magnet. 10. The method of claim 9,
Wherein the second trapping magnet accommodating portion is formed on the outer surface of the motor shaft so as to be recessed along the radial direction. 9. The method of claim 8,
Wherein the drive shaft extends outside the motor shaft,
And a drive shaft bearing for supporting the drive shaft is provided on an outer side of the second oil seal along the axial direction. 7. The method according to any one of claims 1 to 6,
A bearing support portion is provided on an outer side of the oil seal along an axial direction so that a bearing for supporting the motor shaft can be received,
An oil groove is formed in the bearing support portion so that the oil of the reduction gear can be circulated,
Wherein the collecting magnet includes a bearing magnet provided on one side of the bearing along an axial direction to suppress movement of flour from the speed reducer side to the bearing side. 13. The method of claim 12,
Wherein the bearing magnet is provided outside the oil groove along a radial direction. 13. The method of claim 12,
Wherein the bearing magnet is provided on one side of the oil groove along the circumferential direction. 13. The method of claim 12,
Wherein the bearing magnet is provided at an inlet of a reduction gear of the bearing support portion. 16. The method of claim 15,
Wherein the bearing magnet has a ring shape. 17. The method of claim 16,
Wherein the bearing support portion includes a bearing magnet accommodating portion extended to accommodate the bearing magnet. 18. The method of claim 17,
Wherein an inner diameter of the bearing magnet accommodating portion is larger than an inner diameter of the bearing supporting portion. 18. The method of claim 17,
Wherein the bearing magnet receiving portion has an expanded width in comparison with an axial width of the bearing magnet.

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