JP2014140311A - Spiral rotor axle mounting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spiral rotor axle mounting structure which can suppress deterioration of working efficiency of grass cutting work by preventing grass from winding around the rotation center shaft and axle of a spiral rotor.SOLUTION: A spiral rotor axle mounting structure includes a rotation center shaft 31 connected to an axle of a control machine 1, an inner support member 22 and an outer support member 27 installed on axial both sides of the rotation center shaft 31 in a direction approximately orthogonal to the rotation center shaft 31, and a spiral blade 33 connected between these support members. In order to mount spiral rotors 20, 20', rotating in accordance with the rotation of the axle, to the axle, a cylindrical body 40 enclosing the axle in a state where the rotation is restricted is installed to a transmission case 5 supporting the axle. When one end of the rotation center shaft 31 extending from the inner support member 22 of the spiral rotor 20 is connected to the axle, the cylindrical body 40 encloses the outer periphery of the one end side of the rotation center shaft 31 extending from the inner support member 22.

Description

  The present invention relates to an axle mounting structure of a spiral rotor that is mounted on an axle of a management machine and rotates as the axle rotates.

  Conventionally, mowing work is performed by a management machine equipped with a spiral rotor. As described in Patent Document 1, the spiral rotor includes a pair of rings arranged on both sides in the axial direction of the rotor and a plurality of spiral blades that connect the rings. .

  A boss connected to the ring via a spoke is provided at the center of one of the rings. The boss extends in the axial center direction of the spiral rotor, is disposed inside the center of one ring, and is connected to the axle of the management machine. The boss is formed in a cylindrical shape or a hexagonal shape, and the axle is connected to the boss via a pin in a state where the axle is inserted into a through hole formed inside the boss. Accordingly, the power of the axle is transmitted to the spiral rotor through the boss, and the spiral rotor is rotated.

Japanese Utility Model Publication No. 63-167803

  In this conventional spiral rotor, the boss and a part of the axle are exposed, so when the spiral rotor rotates, the cut grass winds around the rotating boss and the axle, and if the amount of winding increases, the axle becomes difficult to rotate. There is a risk that the mowing operation will be difficult. Therefore, before the work becomes difficult, it is necessary to remove the wound grass, the mowing work is interrupted, and the work efficiency is lowered.

  The present invention has been made in order to solve such problems, and prevents the wrapping of grass around the rotation center shaft and axle of the spiral rotor, and the spiral rotor capable of suppressing the reduction in the working efficiency of the cutting operation. An object is to provide an axle mounting structure.

  In order to solve such a problem, the present invention is provided with a rotation center shaft connected to the axle of the management machine, and on both sides of the rotation center axis in a direction substantially orthogonal to the rotation center axis. An axle of a spiral rotor having a pair of support portions (inner support member 22 and outer support member 27 in the embodiment) and a spiral blade connected between the pair of support portions and rotating as the axle rotates. A rotation center shaft extending from a support portion on one side of the spiral rotor, which is a mounting structure, and a transmission case that rotatably supports the axle of the management machine is provided with a cylindrical body surrounding the axle in a state where rotation is restricted When one end of the shaft is connected to the axle of the management machine, the outer periphery of the rotation center shaft extending from the support portion on one side is surrounded by the cylindrical body (claim 1).

  Further, the present invention is provided with a fitting body that is disposed so as to surround the rotation center axis extending from the support portion on one side of the spiral rotor and is slidably fitted to the inner surface of the cylindrical body. When one end portion of the rotation center shaft is connected to the axle of the management machine, the fitting body is fitted into the cylindrical body, and the outer periphery of the fitting body is surrounded by the cylindrical body. .

  Further, the cylindrical body of the present invention is arranged such that when one end portion of the rotation center shaft is connected to the axle, the end portion on the spiral rotor side of the cylindrical body is close to the support portion on one end side of the spiral rotor. (Claim 3).

  Further, the cylindrical body of the present invention includes a cylindrical cylindrical portion surrounding the axle, and an intermediate plate portion provided at an intermediate portion in the axial center direction in the cylindrical portion and provided with an insertion hole through which the axle is inserted. And when one end of the rotation center shaft is connected to the axle of the management machine, the tip of the fitting body contacts the middle plate of the cylindrical body to restrict the movement of the cylindrical body toward the spiral rotor (Claim 4).

  Further, the cylindrical body of the present invention is provided with an annular flange portion extending radially outward at the end portion on the spiral rotor side, and when one end portion of the rotation center shaft is connected to the axle, the flange portion is the spiral rotor portion. It is arrange | positioned in the position close | similar to the support part of one end side (Claim 5).

  In addition, on the outside of the cylindrical body of the present invention, there is a pair of rotation restricting members that extend along the axial direction of the cylindrical body and that are provided at a predetermined interval in the circumferential direction of the cylindrical body. The pair of rotation restricting members protrude from the axial end of the tubular body and are locked to a flat portion formed in the transmission case to restrict the rotation of the tubular body. 6).

  In addition, a recess is formed on the outer side of the support portion on one side of the present invention so that the end of the cylindrical body can be inserted when one end of the rotation center shaft of the spiral rotor is connected to the axle of the management machine. (Claim 7).

  Further, the cylindrical body of the present invention is provided with an annular flange portion extending radially outward at the end portion on the spiral rotor side, and one end portion of the rotation center axis of the spiral rotor is provided on the outer side of the support portion on one side. A concave portion into which the entire flange portion of the cylindrical body can be inserted is formed when the management machine is connected to the axle (claim 8).

  According to the axle mounting structure of the spiral rotor according to the present invention, by having the above-described feature, it is possible to prevent the grass from being wound around the rotation center shaft and the axle of the spiral rotor and to suppress the reduction in the working efficiency of the cutting operation. Can do.

The front side perspective view of the management machine in which the axle mounting structure of the spiral rotor concerning one Embodiment of this invention is mounted is shown. The perspective view of the mission case for demonstrating the axle shaft provided in the mission case of the management machine is shown. The fragmentary perspective view of the management machine with which the spiral rotor was connected with the axle shaft is shown. The partial perspective view of the management machine of the state where the cylindrical body surrounding an axle shaft was equipped with the mission case is shown. FIG. 3 shows a cross-sectional view of a spoke according to another embodiment of the present invention. FIG. 5 shows a spiral rotor axle mounting structure according to another embodiment of the present invention, in which FIG. (A) is a perspective view of a state immediately before the spiral rotor is connected to the axle, and (b) in FIG. FIG. The perspective view of the cylindrical body concerning other embodiment of this invention is shown. The perspective view of the cylindrical body concerning other embodiment of this invention is shown. It is a fragmentary perspective view of the management machine of the state where the spiral rotor was connected with the axle shaft using the cylindrical body with a flange concerning other embodiments of the present invention. Sectional drawing of the spoke which can insert the front-end | tip part of the cylindrical body in which the intermediate | middle board was provided in the cylindrical part concerning other embodiment of this invention in a recessed part is shown. Sectional drawing of the spoke which can insert the front-end | tip part of the cylindrical body by which the flange part was provided in the front-end | tip part of the cylindrical part concerning other embodiment of this invention in a recessed part is shown.

  Hereinafter, the axle mounting structure of the spiral rotor of the present invention will be described with reference to FIGS. In the present embodiment, an axle mounting structure of a spiral rotor for mounting a spiral rotor to a walking type management machine will be described. First, before describing the axle mounting structure of the spiral rotor, the management machine and the spiral rotor will be described with reference to FIG. 1 (front perspective view) and FIG. 2 (perspective view).

  As shown in FIG. 1, the management machine 1 has an engine (not shown) mounted on a body frame 3, and a mission case 5 that extends downward is provided at the center of the body frame 3. A pair of axles 7 (see FIG. 2) are provided on both sides so as to project, and spiral rotors 20 and 20 ′ are attached to the axles 7.

  A cover 9 that covers the engine is provided on the body frame 3, and a pair of operation handles 11 that extend obliquely rearward and upward from both sides in the width direction of the body frame 3 are provided at the rear of the body frame 3. The engine is driven by operating a lever 11 a provided on the operation handle 11 to rotate the spiral rotors 20, 20 ′ via the axle 7.

  As shown in FIG. 2, a columnar step 8 is formed around the axle 7 of the mission case 5 provided with the axle 7, and a lid 10 is provided below the axle 7 via bolts 12 and the like. It is attached. The lid portion 10 is detachably attached to the lower portion of the mission case 5 via a flange portion 10a formed around the lid portion 10a. The flange portion 10a is formed in a planar shape, and a cylindrical body 40 (see FIG. 3), which is a part of an axle mounting structure described later, can be mounted in a state in which rotation is restricted.

  Next, the spiral rotors 20 and 20 ′ will be described. The spiral rotors 20 and 20 'are provided on both sides of the transmission case 5 in the width direction. Since these are symmetrical structures, the spiral rotor 20 provided on the right side in the width direction will be described. Regarding the provided spiral rotor 20 ′, the same reference numerals are given to the same aspects as the spiral rotor 20, and the description thereof is omitted.

  As shown in FIG. 3, the spiral rotor 20 includes a rotation center shaft 31 mounted on the axle 7 (see FIG. 2), an inner support member 22 and an outer support member arranged on both sides in the axial direction of the rotation center shaft 31. 27 and a plurality of spiral blades 33 connected between the inner support member 22 and the outer support member 27.

  As shown in FIG. 5, the rotation center shaft 31 is formed in a cylindrical shape having a hole portion 31a through which the inside penetrates, and the axle 7 of the transmission case 5 is inserted into an opening portion on one side of the hole portion 31a. The rotation center shaft 31 is connected to the axle 7 by a connecting pin 35 inserted between the rotation center shaft 31 and the axle 7. An r pin 36 is inserted into the connecting pin 35 to restrict the connecting pin 35 from being removed. For this reason, the spiral rotor 20 can be removed from the axle 7 by removing the connecting pin 35 from the rotation center shaft 31 and the axle 7.

  As shown in FIG. 3, the inner support member 22 includes a ring 23 formed in an annular shape and a plurality of spokes 24 that connect the ring 23 and the rotation center shaft 31. The ring 23 is disposed coaxially with the rotation center shaft 31 by a plurality of spokes 24. The radius of the ring 23 is smaller than the rotation radius of the spiral blade 33 connected between the inner support member 22 and the outer support member 27. For this reason, the ring 23 does not interfere when the grass or the like is cut by the spiral blade 33.

  The spoke 24 has one end connected to the rotation center shaft 31 extending inwardly of the ring 23 and the other end side extending in a direction substantially orthogonal to the rotation center shaft 31, and the other end of the straight portion 24a. An inclined portion 24 b that bends outward in the axial direction of the rotation center shaft 31 and extends toward the ring 23, and the other end of the inclined portion 24 b is connected to the ring 23. A plurality of spokes 24 are provided at a predetermined interval in the circumferential direction of the ring 23.

  The spiral blade 33 has an inner end in the longitudinal direction connected to the inner surface of the ring 23 from the lateral direction, and a space S through which soil or the like can penetrate is formed on the back side of the inner end in the longitudinal direction of the spiral blade 33. Yes. For this reason, there is no possibility that soil, grass, or the like is accumulated around the inner edge of the spiral blade 33 in the longitudinal direction. The connection of the outer edge of the spiral blade 33 in the longitudinal direction to the outer support member 27 will be described later.

  The outer support member 27 includes a disk part 27a formed in a substantially circular shape when viewed from the side, and a plurality of protruding plate parts 27b extending radially at predetermined intervals in the circumferential direction on the outer periphery of the disk part 27a. Is formed.

  The protruding plate portion 27b is formed so that its width increases as it advances toward the tip side. The outer end in the longitudinal direction of the spiral blade 33 is fixed to the inner surface on the front side in the rotational direction of the protruding plate portion 27b by welding from the lateral direction.

  Next, an axle mounting structure for mounting the spiral rotor 20 to the axle 7 of the management machine 1 will be described.

  As shown in FIG. 4, the axle mounting structure of the spiral rotor 20 is configured by providing a cylindrical body 40 that surrounds the axle 7 in a state where the rotation is restricted at the step portion 8 of the mission case 5 of the management machine 1. Yes. The cylindrical body 40 has a cylindrical cylindrical portion 40a that surrounds the axle 7, and extends along the axial direction of the cylindrical portion 40a on the outer lower portion of the cylindrical portion 40a and has a predetermined interval in the circumferential direction of the cylindrical portion 40a. And a pair of rotation restricting members 40b provided. When the cylindrical portion 40a of the cylindrical body 40 is attached to the stepped portion, the pair of rotation restricting members 40b is provided on the bottom surface of the flange portion 10a of the lid portion 10 with the pair of rotation restricting members 40b attached to the lower portion of the mission case 5. And the rotation of the cylindrical body 40 is restricted.

  The cylindrical portion 40 a has a size that can be inserted into and removed from the step portion 8 formed around the axle 7 of the mission case 5. Further, the height of the cylindrical portion 40a is such that the front end portion of the axle 7 protrudes from the front end of the cylindrical portion 40a in a state where the cylindrical portion 40a is attached to the stepped portion 8, and as shown in FIG. In a state where one end side of the rotation center shaft 31 extending from the support member 22 is connected to the axle 7, the tip of the cylindrical portion 40 a is close to the straight portion 24 a of the spoke 24 of the inner support member 22. A hole 7a into which the connecting pin 35 (see FIG. 5) is inserted is provided on the axle 7 protruding from the tip of the cylindrical portion 40a.

  For this reason, when one end portion of the rotation center shaft 31 of the spiral rotor 20 is connected to the axle 7 of the management machine 1, the tubular body 40 surrounds substantially the entire one end side of the rotation center shaft 31, and the rotation center shaft One end side of 31 is a non-exposed body, and the distal end portion of the cylindrical body 40 is located in the vicinity of the spoke 24 of the inner support member 22. For this reason, at the time of mowing work by the spiral rotor 20, it is possible to prevent the possibility that grass or the like is wound around one end side of the rotation center shaft 31, and there is no situation where the mowing work is interrupted in order to remove the wound grass. It is possible to prevent a decrease in work efficiency.

  In the above-described embodiment, when one end portion of the rotation center shaft 31 of the spiral rotor 20 is connected to the axle 7 of the management machine 1, the distal end portion of the cylindrical body 40 is positioned in the vicinity of the spoke 24 of the inner support member 22. Although configured to be positioned, as shown in FIG. 5 (cross-sectional view), a recess 24c is formed on the outer side of the end of the spoke 24 on the rotation center axis side, and the tip of the cylindrical body 40 is placed in the recess 24c. It may be located. In this way, when one end of the rotation center shaft 31 of the spiral rotor 20 is connected to the axle 7 of the management machine 1, the tubular body 40 can reliably surround the entire one end side of the rotation center shaft 31. . For this reason, at the time of mowing work by the spiral rotor 20, it is possible to surely prevent the rotation center shaft 31 such as grass from being wound around one end side, and it is possible to more reliably prevent the work efficiency of the mowing work from being lowered.

  In the above-described embodiment, the case where the spoke 24 is provided with the concave portion 24c is shown. Instead of providing the concave portion 24c, as shown in FIG. 6A, one end side of the rotation center shaft 31 of the spiral rotor 20 is provided. A fitting body 45 that is fixed to the spokes 24 may be provided so as to surround the.

  The fitting body 45 is formed in a cylindrical shape, and is fixed to the outside of the straight portion 24a of the spoke 24 by welding. The fitting body 45 is disposed substantially coaxially with the rotation center shaft 31, and the outer diameter of the fitting body 45 is slidably fitted into a cylindrical portion 40a of a cylindrical body 40 ′ described later. ing.

  The length L in the axial direction of the fitting body 45 is such that the fitting body 45 is fitted into the cylindrical body 40 ′ and the distal end portion of the fitting body 45 is in contact with a later-described middle plate portion 40 c provided in the cylindrical body 45. When it does, the front-end | tip part of cylindrical body 40 'has the length which can adjoin to the linear part 24a of the spoke 24 (refer FIG.6 (b)).

  The cylindrical body 40 ′ is configured by providing an intermediate plate portion 40c in the above-described cylindrical body 40 (see FIG. 4). That is, as shown in FIG. 7, the cylindrical body 40 ′ includes a cylindrical cylindrical portion 40 a that surrounds the axle 7 (see FIG. 5), and a pair of rotation regulating members that are provided at the outer lower portion of the cylindrical portion 40 a. 40b and a middle plate portion 40c provided in the cylindrical portion 40a and provided with an insertion hole 40d through which the axle 7 is inserted.

  The intermediate plate portion 40c is attached to the inner surface of the cylindrical portion 40a at a position having a predetermined distance from the proximal end portion to the distal end portion side of the cylindrical portion 40a, and an insertion hole 40d is formed in the central portion of the intermediate plate portion 40c. Is provided. This predetermined distance is larger than the height of the step portion 8 (see FIG. 4) provided at the lower portion of the mission case 5.

  If comprised in this way, as shown in FIG.6 (b), if the one end part of the rotation center axis | shaft 31 of the spiral rotor 20 is connected with the axle shaft 7 of the management machine 1, the fitting body 45 will become cylindrical body 40 '. The whole of the one end side of the rotation center shaft 31 can be covered with the cylindrical body 40 ′ and the fitting body 45, and substantially the whole of the fitting body 45 can be covered with the cylindrical body 40 ′. Therefore, at the time of mowing work by the spiral rotor 20, it is possible to prevent the possibility that grass or the like is wound around one end side of the rotation center shaft 31, and it is possible to prevent the work efficiency of the mowing work from being lowered.

  Further, when one end portion of the rotation center shaft 31 of the spiral rotor 20 is connected to the axle 7 of the management machine 1, the distal end portion of the fitting body 45 comes into contact with the middle plate portion 40c of the tubular body 40 ′ and the tubular body. The movement of 40 ′ toward the spiral rotor 20 is restricted.

  Further, by fitting the fitting body 45 into the tubular body 40 ′, it is possible to suppress the shake during rotation of the spiral rotor 20.

  Further, in the embodiment shown in FIG. 7, the case where the cylindrical body 40 ′ having the intermediate plate portion 40c is provided inside the cylindrical portion 40a is shown. However, as shown in FIG. A cylindrical body 40 ″ may be used in which the middle plate portion 40c is removed and a flange portion 40e is provided at the tip of the cylindrical portion 40a. The flange portion 40e is formed in an annular shape so as to protrude radially outward at the distal end portion of the cylindrical portion 40a.

  As shown in FIG. 9, when one end of the rotation center shaft 31 of the spiral rotor 20 is connected to the axle 7 of the management machine 1, the flange portion 40 e is connected to the straight portion 24 a of the spoke 24. Arranged in close proximity. Therefore, at the time of mowing work by the spiral rotor 20, it is possible to prevent the possibility that grass or the like is wound around one end side of the rotation center shaft 31, and it is possible to prevent the work efficiency of the mowing work from being lowered.

  Further, even when the cylindrical body 40 ″ moves toward the spiral rotor 20 ′ during the rotation of the spiral rotor 20 ′, the flange 40e comes into contact with the straight portion 24a of the spoke 24, so that the cylindrical body 40 ″. The movement to the spiral rotor side can be restricted.

  In the above-described embodiment, the case where the pair of rotation restricting members 40b is provided on the tubular bodies 40, 40, 40 '' is shown. However, instead of the rotation restricting member 40b, a fastening means such as a screw or a tube is used by welding. The members 40, 40 ′, 40 ″ may be attached to the mission case 5.

  Further, in the above-described embodiment, as shown in FIG. 5, the recess 24c is formed outside the end portion of the spoke 24 on the rotation center axis side so that the distal end portion of the cylindrical body 40 is positioned in the recess 24c. However, as shown in FIG. 10 (cross-sectional view), when the fitting body 45 is fitted inside the cylindrical body 40 ′ in which the middle plate portion 40 c is provided in the cylindrical portion 40 a, the rotation of the spiral rotor 20 is performed. When one end of the central shaft 31 is connected to the axle 7 of the management machine 1, the tip of the cylindrical body 40 ′ may be inserted into the recess 24 c ′ provided in the spoke 24.

  Further, as shown in FIG. 11 (sectional view), when the fitting body 45 is fitted inside the cylindrical body 40 ″ having the flange portion 40e, one end portion of the rotation center shaft 31 of the spiral rotor 20 is managed. When connected to the axle 7 of the machine 1, the flange portion 40 e of the tubular body 40 ″ may be inserted into the recess 24 c ″ provided in the spoke 24.

  Thus, even when the fitting body 45 is fitted inside the tubular bodies 40 ′ and 40 ″, the tip portions of the tubular bodies 40 ′ and 40 ″ are recessed portions 24 c ′ and 24 c provided in the spokes 24. If it is configured so that it can be inserted into '', when one end of the rotation center shaft 31 of the spiral rotor 20 is connected to the axle 7 of the management machine 1, the fitting body 45 can be prevented from being exposed. Therefore, it is possible to surely prevent the possibility of grass or the like being wound around the fitting body 45, and it is possible to prevent the work efficiency of the mowing work from being lowered.

  In the above-described embodiment, as shown in FIG. 1, the walking-type management machine 1 is taken as an example of the management machine to which the spiral rotors 20 and 20 ′ are mounted. However, a self-propelled management machine may be used. In the above-described embodiment, the management machine 1 in which the spiral rotors 20 and 20 'are attached to the axle 7 is shown. However, the management machine in which a tire is mounted on the axle 7 and a tilling rotor is disposed on the rear side of the tire. The spiral rotors 20 and 20 ′ may be attached instead of the tilling rotor.

1 Control Machine 5 Mission Case 7 Axle 10a Flange (Plane)
20, 20 'Spiral rotor 22 Inner support member (support part)
24c, 24c ′, 24c ″ concave portion 27 outer support member (support portion)
31 Rotation center shaft 33 Spiral blade 40, 40 ', 40''Cylindrical body 40a Cylindrical part 40b Rotation restricting member 40c Middle plate part 40e Flange part 45 Fitting body

Claims (8)

A rotation center shaft connected to the axle of the management machine, a pair of support portions disposed on both sides of the rotation center axis in a direction substantially perpendicular to the rotation center axis, and the pair of support portions An axle mounting structure of a spiral rotor that has a spiral blade connected in between and rotates as the axle rotates.
A transmission case that rotatably supports the axle of the management machine is provided with a cylindrical body that surrounds the axle in a state where rotation is restricted,
When one end of the rotation center shaft extending from the support portion on one side of the spiral rotor is connected to the axle of the management machine, the rotation center shaft extending from the support portion on the one side by the cylindrical body. A spiral rotor axle mounting structure characterized in that the outer periphery is surrounded. A fitting body is provided so as to surround the rotation center axis extending from the support portion on one side of the spiral rotor and slidably fitted to the inner surface of the cylindrical body;
When one end portion of the rotation center shaft of the spiral rotor is connected to the axle of the management machine, the fitting body is fitted to the cylindrical body, and the outer circumference of the fitting body is surrounded by the cylindrical body. The axle mounting structure of the spiral rotor according to claim 1, wherein The cylindrical body is arranged such that when one end of the rotation center shaft is connected to the axle, the end on the spiral rotor side of the cylindrical body is close to the support portion on one end of the spiral rotor. The axle mounting structure of the spiral rotor according to claim 2, wherein: The cylindrical body has a cylindrical cylindrical portion that surrounds the axle, and an intermediate plate portion that is provided at an intermediate portion in the axial center direction in the cylindrical portion and includes an insertion hole through which the axle is inserted. ,
When one end portion of the rotation center shaft is connected to the axle of the management machine, the tip of the fitting body contacts the middle plate portion of the cylindrical body, and the cylindrical body moves toward the spiral rotor. The axle mounting structure of the spiral rotor according to claim 3, wherein: The cylindrical body is provided with an annular flange portion extending radially outward at an end on the spiral rotor side,
4. The spiral according to claim 3, wherein when the one end portion of the rotation center shaft is connected to the axle, the flange portion is disposed at a position close to the support portion on one end side of the spiral rotor. Rotor axle mounting structure. On the outside of the cylindrical body, it has a pair of rotation restricting members that extend along the axial direction of the cylindrical body and that are provided at a predetermined interval in the circumferential direction of the cylindrical body,
The pair of rotation restricting members protrude from an axial end portion of the cylindrical body and are engaged with a flat portion formed in the mission case to restrict the rotation of the cylindrical body. Item 6. The spiral rotor axle mounting structure according to any one of Items 1 to 5. On the outer side of the support portion on one side, a recess is formed in which one end portion of the rotation center shaft of the spiral rotor can be inserted when the tip of the cylindrical body is inserted into the axle of the management machine. The axle mounting structure of the spiral rotor according to claim 1 or 2, wherein The cylindrical body is provided with an annular flange portion extending radially outward at an end on the spiral rotor side,
On the outside of the support portion on one side, there is a recess into which the entire flange portion of the cylindrical body can be inserted when one end portion of the rotation center shaft of the spiral rotor is connected to the axle of the management machine. It is formed. The axle mounting structure of the spiral rotor of Claim 2 characterized by the above-mentioned.

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