KR101366208B1 - Multi-rotor type small aircraft - Google Patents

Abstract

The present invention relates to a multi-rotor type small aircraft and more specifically, a multi-rotor type small aircraft capable of improving durability and reliability of an aircraft by preventing shaking or distorting caused by vibration generated during a flight, and an excellent portability and transportability with easily assembled and disassembled aircraft as the composition of the aircraft is simple.

Description

Multi-rotor type small aircraft

The present invention relates to a multi-rotor type small aircraft, more specifically, the configuration of the aircraft is simple, easy assembly and disassembly of the aircraft, excellent portability and portability, as well as shaking due to vibration generated during flight of the aircraft The present invention relates to a small rotor of a multi-rotor type capable of preventing warpage and increasing warp durability and reliability.

In general, a flying vehicle using a plurality of propellers is used to combine a rotor arm assembly, a shroud and a rotor with a central pod, such as US Patent Publication No. US2009 / 0283629, so that the rotor can operate while the rotor is operated. It was.

However, when the rotor arm assembly, the shroud, the rotor, etc. are coupled to the center pod as described above, the receptacle, the arm, and the retaining ring should be coupled to each other. Accordingly, there is a problem in that the gap is generated in the coupling portion is not properly assembled so that each component is shaken or twisted during flight of the aircraft.

The small rotor of the multi-rotor type of the present invention includes a first plate in which a fitting groove is formed inward, a plurality of power connection portions above the first plate, and a first projection groove and a first coupling groove at adjacent points of the power connection portion. A plurality of first fixing parts, the first coupling portion is formed so that the first spacing groove is formed to be coupled to the first coupling portion, a plurality of first coupling portion is in close contact with the first coupling portion is rotated by a hinge A plurality of first interval fixing members formed on both sides, a second plate formed on an upper side of the first interval fixing member, a plurality of second interval fixing members formed on an upper side of the second plate, and the second interval fixing member A body part consisting of a third plate formed on an upper side of the body, a first fixing bar having a second projection groove and a second coupling groove formed under the first plate of the body part, and a second formed on an upper side of the first fixing bar. Fixture, both sides of the first and second fixation A lower plate comprising a side plate formed of a second fixing part having a second interval groove formed so that the second rotating latch rotated by a hinge to the lower side of the first fixing part is formed, and the first fixing part of the lower fixing part. A lower support coupled to a second coupling groove formed in the lower support, a fixed portion formed at an upper side of the lower support and formed with a fixing protrusion coupled to the second projection groove, and a support gear formed under the lower support; Coupled to the power connecting portion formed in the body portion coupled to the first coupling groove of the first coupling portion, a plurality of arms formed on one side of the arm, the coupling projection is coupled to the first projection groove of the first coupling portion Body, consisting of a rotating part consisting of a pipe fixing part coupled to the other side of the arm, the bracket is connected to the pipe fixing part is formed a motor for rotating the propeller, the body The lower fixing part is firmly fixed and can be easily assembled and disassembled so that the user can move, assemble and disassemble the aircraft conveniently, and the landing gear is firmly fixed by the first and second fixing bars formed on the lower fixing part. Since the impact transmitted from the weight of the aircraft when the landing of the aircraft is minimized and the landing gear is firmly fixed to the lower fixing portion, it is possible to further prevent the shake or distortion generated during the flight of the aircraft.

The present invention can be easily assembled and disassembled while the body and the lower fixing part is firmly fixed, the user can move or assemble, disassemble the aircraft conveniently, landing by the first and second fixing bars formed on the lower fixing part The gear part is firmly fixed to minimize the impact transmitted from the weight of the aircraft during landing of the aircraft, and the landing gear is firmly fixed to the lower fixing part, thereby additionally preventing the shaking or warping generated during the flight of the aircraft. .

In addition, since the arm of the rotating unit is firmly coupled to the power connection unit and the first coupling unit in threefold, there is an advantage that can prevent the shaking and distortion generated during flight of the aircraft.

The body and the lower fixing part are firmly fixed by the fitting latch formed on the lower fixing part, and the lower fixing part is firmly fixed to the first plate of the body part by the bolt fixing part to be separated or broken by the shaking of the aircraft. As well as the prevention, as the inclined surface is formed on the bolt fixing part, there is an advantage that the first and second fixing stands and the side plate are more firmly fixed to the body part.

In addition, the body portion and the lower fixing portion can be easily coupled and separated by the fitting groove of the body portion and the lower fixing portion, and the body portion and the lower fixing portion are coupled through the first and second pairs of the body portion and the lower portion. There is an advantage in that the coupling force is increased by multiple couplings.

In addition, the coupling fixing portion formed on the rotating part, the arm to which the propeller is coupled through the bracket is firmly fixed to the body portion, as well as the shaking caused during the flight of the aircraft, the first coupling portion, the coupling fixing portion By absorbing in the minimized impact transmitted to the arm has the advantage of preventing the breakage caused by shaking or separation due to the shaking of the rotating part or its own weight.

In addition, the body portion, the lower fixing portion, the landing gear portion, the configuration of the rotating portion is simple, the user can be easily combined, separated, there is an advantage in the economic ease and easy maintenance.

1 is a perspective view showing a small rotor of the present invention multi-rotor type.
Figure 2 is a perspective view showing the body portion of the small rotor of the present invention multi-rotor type.
3 and 4 is an exploded perspective view showing the body portion of the small rotor of the present invention multi-rotor type.
5 and 6 are perspective views showing the lower fixing part of the small rotor of the present invention multi-rotor type.
Figure 7 is a perspective view of the landing gear of the small rotor of the present invention multi-rotor type.
8 is a perspective view showing a rotating part of the small rotor of the present invention multi-rotor type.
9 is a state diagram showing a coupling state of the body portion and the rotating portion of the small rotor of the present invention multi-rotor type.
10 is a state diagram showing a coupling state of the body portion and the lower fixing portion of the small rotor of the present invention multi-rotor type.
11 is a state diagram showing a coupling state of the small rotor of the present invention multi-rotor type.

Looking at the configuration of the present invention for achieving the above object is as follows.

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

The small rotor 50 of the multi-rotor type of the present invention is composed of a body portion 10, the lower fixing portion 20, the landing gear portion 30, the rotating portion 40, as shown in Figs.

First, as shown in FIGS. 2 to 4, the body portion 10 includes a first plate 11 having one or more fitting grooves 11a formed therein.

In addition, the upper side of the first plate 11 is formed with a power connector 12 of various quantities according to the purpose of the user.

Here, the first plate 11 and the power connection portion 12 may be coupled using a coupling member (not shown) such as a bolt, a nut or a pin, and forms a configuration of a protrusion shape and a groove shape. In order to be able to combine the other configuration, such as can be configured to be coupled to the protrusion form and the groove shape can be used any method currently used in general.

In addition, it is apparent that the power connection unit 12 may use any method for supplying power in general, and thus detailed description thereof will be omitted.

The first coupling part 13 having the same quantity as the power connection part 12 is formed at an adjacent point while being spaced apart from the power connection part 12.

Here, the first coupling portion 13 has a first coupling groove 13b having a first protrusion groove 13a formed therein.

The power connection part 12 and the first coupling part 13 are positioned on the same straight line.

In addition, the first coupling part 13 is located in the outward direction of the power connection part 12.

In addition, a first fixing portion (1) having a first interval groove (14b) is formed is coupled to the first rotating latch (14a) that rotates by a hinge in the outer direction of the first plate (11) and the first coupling portion 13 ( 14) is configured.

In addition, a plurality of first interval fixing members 15 are formed at a point spaced to both sides of the first coupling part 13 in a direction perpendicular to the direction of gravity.

Here, the first coupling part 13, the first fixing part 14, and the first interval fixing member 15 may also be fixed to the first plate 11 in the same manner as the power connection part 12.

As described above, the power connection part 12, the first coupling part 13, the first fixing part 14, and the first interval fixing member 15 are formed on the upper side of the first plate 11. The second plate 16 is formed in the shape (shape) that is the same as or similar to that of the first plate 11 above the chamfering-curved member 15.

Here, the reason for forming the second plate 16 in the same shape or similar shape as the first plate 11 is that the first, second plates 11, 16 when the other configuration, etc. are located between the first, second, The plates 11 and 16 are intended to be able to fix different configurations up and down with the same force.

A plurality of second interval fixing members 17 are arranged above the second plate 16, and a third plate 18 is formed above the second interval fixing members 17.

In addition, the first, second, and third plates 11, 16, and 17 may be coupled to each other through coupling members such as bolts while the first and second interval fixing members 15 and 17 are in close contact with each other. , The grooves to which the two interval fixing members 15 and 17 are coupled are formed in the first, second and third plates 11, 16 and 17, and then the first and second interval fixing members 15 and 17 in the grooves. You can also combine

In addition, the first plate 11, the second plate 16, and the third plate 18 include a camera capable of capturing an image (not shown) and a battery capable of supplying additional power (not shown in the figure). C), a sensor (not shown in the drawing) that can detect an operation state of the aircraft, etc. may be further combined, and a detailed description thereof will be omitted.

On the other hand, the lower fixing part 20 is located to the lower side of the first plate 11 formed in the body portion 10 as shown in Figure 5 and 6 and the second projection groove 21a and the second coupling inward The 1st fixing base 21 in which the groove 21b was formed is comprised.

The second fixing stand 22 is spaced apart from the first fixing stand 21 by a predetermined interval.

Here, the second fixing groove 22 is formed with a third coupling groove 22a corresponding to the second coupling groove 21b formed in the first fixing bracket 21.

In addition, the first and second fixing brackets 21 and 22 are positioned on the same straight line so that the second coupling groove 21b formed in the first fixing bracket 21 and the third coupling groove formed in the second fixing bracket 22 ( The center of 22a) is located on the same straight line.

The side plates 23 are formed on both sides of the first and second fixing tables 21 and 22.

Here, it is apparent that the side plate 23 is formed in a shape that is bent in the outward direction so that the aircraft can be safely supported on the ground, detailed description thereof will be omitted.

In addition, the lower plate fixing part 20 is formed in the side plate 23 by further including a fitting clasp 23a coupled to the fitting groove 11a formed in the first plate 11 of the body portion 10. It is good to be able to be firmly fixed to the first plate 11 of the body portion (10).

In addition, a second fixing part 24 having a second spacing groove 24b to which the second rotating latch 24a which is rotated by a hinge to the lower side of the first fixing table 21 is formed.

In addition, the bolt fixing part 25 may be further included in the inward direction of the side plate 23 while being positioned above the second fixing stand 22.

Here, the bolt fixing portion 25 is the side plate 23 when the side plate 23 is coupled to the lower side of the first plate 11 formed in the body portion 10, the side plate 23 is the first plate 11 with a higher fixing force It is intended to be fixed to the.

This is because the side plate 23 does not have a relatively large area of contact with the first plate 11, so that a coupling member such as a bolt may not be properly coupled, so that the bolt fixing part having a relatively larger area than the side plate 23 ( This is because the bolt fixing part 25 and the first plate 11 can be firmly fixed by using a bolt or the like while keeping the 25 in close contact with the first plate 11.

In addition, the first and second fixing parts 21 and 22, which are tightly coupled to the inside of the side plate 23 while the bolt fixing part 25 is coupled to the inside of the side plate 23, are more firmly fixed to the side plate 23. By doing so, the fixing force and strength of the lower fixing part 20 is to be increased.

In addition, when positioning the bolt fixing portion 25 to the upper side of the second fixing table 22 while positioning the inner side of the side plate 23, so that the inclined surface (25a) is further formed on the bolt fixing portion (25) To combine.

This, the side plate 23 is positioned to the lower side of the body portion 10 when the aircraft is settled on the ground, is formed to be inclined to face outward so that the aircraft can be safely supported on the ground, the side plate 23 The second fixing table 22 to be coupled is formed to be inclined like the side plate 23.

Thus, after the inclined surface 25a is formed on the bolt fixing stand 25 so that the bolt fixing part 25 supporting the side plate 23 can exhibit a higher fixing force, the inclined surface 25a is the second fixing stand 22. ), So that the contact area between the second fixing plate 22 and the bolt fixing part 25 is widened, the first and second fixing parts 21 and 22, the side plate 23, and the bolt fixing part 25 are firmly secured. While being fixed is to increase the fixing force of the lower fixing part (20).

In addition, the first and second fixing brackets 21 and 22 and the bolt fixing part 25 may be coupled to or separated from the side plate 23 through a coupling member such as a bolt. .

Meanwhile, as shown in FIG. 7, the landing gear part 30 is provided with a lower support part 31 coupled to the first fixing part 21 and the second fixing part 22 formed on the lower fixing part 20. have.

Here, the lower support 31 may be formed in various forms, and is coupled to the first fixing stand 21 while being coupled to the second coupling groove 21b formed in the first fixing stand 21.

In addition, a third coupling groove 22a is also formed in the second fixing stand 22. The lower support 31 is coupled to the third coupling groove 22a while the lower support 31 is doublely coupled. It is to increase the holding force of the lower support (31).

In addition, the lower support 31 has a fixing portion 32 is formed with a fixing projection (32a) is coupled to the second projection groove (21a) formed in the first fixing bracket 21 of the lower fixing portion (20). .

Here, the fixing part 32 is also coupled to the lower support 31 by a bolt or the like.

And, the supporting portion 33 is connected to the lower side of the lower support 31 is formed.

Here, the lower support 31 and the supporting portion 33 may be manufactured in one piece, or may be manufactured in a separate type to be combined and separated according to a user's purpose.

In addition, the lower support 31 and the support part 33 of the landing gear part 30 may be made of a metal material and synthetic resin such as carbon, glass fiber reinforced plastic, and polypropylene for minimizing weight and preventing impact. It can be made of ash or the like.

In addition, by attaching a rubber pad or the like to the support part 33, it is possible to minimize the external impact.

In addition, it is obvious that the lower fixing part 20 and the landing gear part 30 are formed in the same quantity, so detailed description thereof will be omitted.

Meanwhile, as shown in FIG. 8, the rotating part 40 is formed of an arm 41 coupled to the power connection part 12 and the first coupling part 13 formed on the body part 10.

When this is described in detail, one side of the arm 41 is fitted to the power connection portion 12 while being coupled to the first coupling groove 13b formed in the first coupling portion 13 of the body portion 10.

Here, one side of the arm 41 and the power connection portion 12 of the body portion 10 is electrically coupled while being coupled mechanically.

In addition, the arm 41 is formed with a coupling fixing portion 42 which is formed with a coupling protrusion 42a coupled to the first protrusion groove 13a formed in the first coupling portion 13 of the body portion 10. It is.

Here, the arm 41 and the coupling fixing part 42 are coupled by bolts in the same way as the lower support 31 and the fixing part 32 formed on the landing gear part 30 are coupled.

Then, the other side of the arm 41 is formed with a pipe fixing part 43a coupled to the pipe-shaped arm 41, and is connected to the pipe fixing part 43a and rotates a propeller (not shown in the figure). The bracket 43 is formed with a motor 43b.

Here, it is obvious that a transmission (not shown) connected to the motor 43b for controlling the rotational force of the propeller will be omitted.

In addition, the transmission may be installed in various parts according to the user's purpose, such as the body portion 10 or the rotating portion 40.

In addition, it is obvious that the rotation direction of the propeller coupled to the motor 43b can be variously set according to the purpose of the user, and thus detailed description thereof will be omitted.

Looking at the operation according to a preferred embodiment of the present invention having the configuration as described above are as follows.

First, a plurality of first interval fixing members 15 and second interval fixing members 17 between the first plate 11, the second plate 16, and the third plate 18 formed on the body portion 10. ), Respectively, to secure the first, second, and third (11, 16, 18).

Here, the first plate 11 is coupled to the power connection portion 12, the first coupling portion 13, the first fixing portion (14).

Then, as shown in Figure 9 to couple the rotating portion 40 to the body portion 10.

If this is described in detail, the one side of the arm 41 is formed in the rotating portion 40, the coupling fixing portion 42 is coupled to the first coupling groove 13b of the first coupling portion 13 while the power connection portion ( 12).

At the same time, the coupling protrusion 42a of the coupling fixing portion 42 formed on the arm 41 is coupled to the first protrusion groove 13a of the first coupling portion 13, The arm 41 is coupled to the body portion 10 while rotating the first rotation latch 14a of the first fixing part 14 formed at the lower side.

Here, the bracket 43 is coupled to the other side of the arm 41.

In addition, the arm 41 of the rotating part 40 may be combined with the quantity of the power connection part 12 and the first coupling part 13 in the same manner as described above.

Here, the first rotary latch 14a formed in the first fixing portion 14 is easily rotated by the first interval groove 14b and according to the rotation direction of the first rotary latch 14a. The arm 41 can be easily coupled or separated at the coupling portion 13.

In addition, when the arm 41 is coupled to the power connection portion 12 and the first coupling portion 13 as described above, the arm 41 is supported in two parts so that the rotation portion 40 is more firmly attached to the body portion 10. Coupled, the coupling portion 42 supports the point where the first coupling portion 13 and the arm 41 is in contact with the first coupling portion 13 and the phenomenon that the contact point of the arm 41 is broken Will be able to prevent.

In addition, the arm 41 is firmly fixed to the first coupling part 13 while the first rotation latch 14a is rotated.

In addition, the body portion 10 and the rotating portion 40 are firmly fixed by the first coupling portion 13 and the coupling fixing portion 42, and the coupling fixing portion 42 is transferred to the arm 41. By minimizing while absorbing vibrations or shocks generated during the flight, the arm 41 may be prevented from being separated from the body portion 10 by its own weight due to impacts or vibrations such as flight.

In addition, the propellers coupled to the arms 41 may be installed to rotate in different directions, in which case, the first rotation latch 14a in the odd rows may rotate in one direction so that the rotational direction of the propellers is not coupled to the other positions. The first rotation latch 14a in even rows may be set to rotate in the other direction.

On the other hand, as shown in Figure 10 to couple the lower fixing portion 20 to the lower side of the first plate 11 of the body portion 10.

To explain this in detail, after fitting the fitting latch 23a formed on the side plate 23 of the lower fixing part 20 to the fitting groove 11a formed on the first plate 11, the bolt is attached to the first plate 11. Insert into the bolt fixing part 25 in close contact with the side plate (23).

Here, it is obvious that the grooves formed by the bolts are formed in the first plate 11 or the bolt fixing part 25, and detailed description thereof will be omitted.

Thereafter, as shown in FIG. 11, the landing gear unit 30 is coupled to the lower fixing part 20.

In detail, the lower fixing part 20 is formed in the landing gear part 30 and the one side of the lower support 31 on which the supporting part 33 is not formed is positioned in the direction toward the lower fixing part 20. While coupling to the second coupling groove 21b formed in the first fixing bracket 21 of the second coupling groove 22 to be coupled to.

At the same time, while fitting the fixing projection 32a of the fixing portion 32 coupled to the lower support 31 into the second projection groove 21a formed in the first fixing bracket 21 of the lower fixing portion 20. It is sufficient to fix the landing gear part 30 to the lower fixing part 20 by rotating the second rotating latch 24a of the second fixing part 24 formed on the lower fixing part 20.

In addition, the second fixing portion 24 is formed with a second interval groove 24b so that the second rotary latch 24a easily rotates to facilitate the lower fixing portion 20 and the landing gear portion 30. It can be combined or separated.

Here, the second fixing part 32 also firmly supports the lower support part 31 like the first fixing part 14 of the body part 10, thereby preventing the lower support part 31 from shaking or twisting. And, it is possible to prevent the lower support 31 from being easily separated from the lower fixing part 20 by the vibration or shock during flight, and to prevent the lower support 31 from being broken.

In addition, when the landing gear unit 30 is coupled to the lower fixing unit 20, the first and second fixing units 21 and 22 formed in the lower fixing unit 20 are the lower supports of the landing gear unit 30. While supporting (31) double and firmly, the lower support 31 is not easily separated.

In addition, the bolt fixing part 25 formed on the lower fixing part 20 firmly supports the first and second fixing members 21 and 22 and the side plate 23, thereby supporting and coupling force of the lower fixing part 20. Will be able to increase.

In addition, when the arm 41 of the rotating part 40 is coupled to the power connection part 12 and the first coupling part 13 of the body part 10, the first protrusion groove 13a and the first coupling groove of the body part are combined. The coupling protrusion 42a and the coupling fixing part 42 of the rotating part 40 are fixed to the first, and the first fixing part 14 of the body part 10 is rotated so that the arm 41 of the rotating part 40 is rotated. While being in close contact with the secondary, it is fixed in the secondary, so that the rotating part 40 in the body portion 10 is not easily separated by its own weight by shaking or vibration of the vehicle.

Similarly, the lower support 31 of the landing gear part 30 is first fixed to the first and second fixing stands 21 and 22 of the lower fixing part 20, and the fixing part 32 is fixed to the second fixing part 24. Is coupled to the secondary so that the landing gear part 30 in the lower fixing portion 20 is not easily separated.

For this reason, the strength of the point where the body portion 10 and the rotating portion 40 are in contact with the lower fixing portion 20 and the landing gear portion 30 is excellent, so that the portion is not easily damaged. .

The body portion 10, the lower fixing portion 20, the landing gear portion 30, the rotating portion 40 may be combined in the same manner as above, but the order may be different according to the user and the separation order may be variously selected. It is obvious that the details can be omitted.

Although the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is obvious to those who have knowledge of.

10:
11: First Edition 11a: Fitting Groove
12: power connection
13: first coupling portion 13a: first projection groove
13b: First Combination Home 14: First Government
14a: first rotary latch 14b: first interval groove
15: first interval fixing member 16: the second edition
17: second interval fixing member 18: the third edition
20: lower fixing part
21: first fixing station 21a: second projection groove
21b: second coupling groove 22: the second fixing rack
22a: third coupling groove 23: side plate
23a: fitting latch 24: 2nd government
24a: Second rotary latch 24b: Second interval groove
25: bolt fixing 25a: slope
30: landing gear
31: lower support 32: fixed part
32a: fixing protrusion 33: support portion
40:
41: cancer 42: consolidation
42a: engaging projection 43: Braun
43a: pipe fixing part 43b: motor
50: small rotor of the multi-rotor type

Claims (5)

The first plate 11 in which the fitting groove 11a is formed inward, a plurality of power connection portions 12 above the first plate 11, and a first projection groove at an adjacent point of the power connection portion 12. 13a) and the first coupling groove 13b includes a plurality of first coupling portion 13 is formed, the first rotary latch 14a is in close contact with the first coupling portion 13 and rotated by a hinge A plurality of first fixing parts 14 having a first interval groove 14b formed therein; a plurality of first interval fixing members 15 formed at both sides of the first coupling part 13; and fixing the first intervals. A second plate 16 formed above the member 15, a plurality of second interval fixing members 17 formed above the second plate 16, and an upper side of the second interval fixing member 17. Body portion 10 consisting of a third plate 18 formed of a;
The first fixing base 21 and the upper side of the first fixing base 21 in which the second projection groove 21a and the second coupling groove 21b are formed below the first plate 11 of the body portion 10. The second fixing bracket 22 is formed as a side plate 23 is formed on both sides of the first, second fixing brackets 21 and 22, the second rotating latch is rotated by a hinge to the lower side of the first fixing bracket 21 A lower fixing part 20 including a second fixing part 24 having a second interval groove 24b formed therein so as to engage the 24a;
The lower support 31 is coupled to the second coupling groove 21b formed in the first fixing bracket 21 of the lower fixing portion 20, the lower support 31 is located above the second projection groove 21a. A landing gear part 30 including a fixing part 32 formed with a fixing protrusion 32a coupled to the support part, and a support part 33 formed below the lower support 31;
A plurality of arms 41 coupled to the power connection 12 formed in the body portion 10 and coupled to the first coupling groove 13b of the first coupling portion 13, and formed on one side of the arm 41. A coupling fixing portion 42 having a coupling protrusion 42a coupled to the first protrusion groove 13a of the first coupling portion 13, and a pipe fixing portion 43a coupled to the other side of the arm 41; Small rotor of the multi-rotor type, characterized in that consisting of; rotating part 40 consisting of a bracket 43 is connected to the pipe fixing part (43a) and the motor (43b) for rotating the propeller is formed.
The method of claim 1, wherein the second fixing stand 22 of the lower fixing portion 20 is formed to further include a third coupling groove 22a corresponding to the second coupling groove 21b of the first fixing stand 21. Small rotor of multi-rotor type characterized by being.
The side plate 23 of the lower fixing part 20 further includes a fitting latch 23a coupled to the fitting groove 11a formed in the first plate 11 of the body part 10. Small rotor of multi-rotor type characterized by being formed.
The small rotor of claim 1, wherein a bolt fixing part (25) is further included inside the side plate (23) of the lower fixing part (20).
The small rotor of claim 4, wherein the bolt fixing portion (25) formed on the lower fixing portion (20) is further formed to include an inclined surface (25a).

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