JP2014027907A - Spiral rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spiral rotor capable of inhibiting adhesion of earth or the like to a spiral rotor and hardly lowering sharpness of a spiral blade.SOLUTION: A spiral rotor 20 is mounted to an axle of a management machine 1 to rotate with rotation of the axle. The spiral rotor 20 includes: a rotation center shaft 31 mounted coaxially with the axle; a pair of annular rings 21 provided along a plane substantially orthogonal to the shaft center direction of the rotation center shaft 31 on both sides in the axial direction of the rotation center shaft 31; and a spiral blade 27 connected between the rings 21. The spiral blade 27 is supported on the tips of the rings 21 to which both ends thereof in the longitudinal direction correspond from the lateral direction.

Description

  The present invention relates to a spiral rotor mounted on a management machine.

  Conventionally, mowing work is performed by a management machine equipped with a spiral rotor. As described in Patent Document 1, this spiral rotor is connected to a pair of rings arranged on both sides, a plurality of spiral blades connecting these rings, and one ring via a boss. And a boss connected to the axle of the management machine.

  The spiral blade is formed in a band shape, and a blade portion is formed to extend in the longitudinal direction on one side in the short direction of the spiral blade. One end of the spiral blade in the longitudinal direction is fixed to the outer peripheral upper surface of one ring, and the other end of the spiral blade is fixed to the outer peripheral upper surface of the other ring. For this reason, when the spiral rotor rotates so that the blade portion is on the front side in the rotation direction with the management machine installed in the field, the management machine moves forward with the rotation of the spiral rotor, and the spiral blade cuts the grass in the field. Etc. can be reaped.

Japanese Utility Model Publication No. 63-167803

  The spiral blade provided in this conventional spiral rotor is connected in a state where its longitudinal end is placed on the outer periphery of the ring, and a step is formed on the front side in the rotational direction. For this reason, it becomes easy to collect the soil and the cut grass of the farm which contacted the level difference at the time of rotation of the spiral rotor. If soil or the like accumulates at this step, the biting of the spiral blade with respect to the soil or the like is restricted and shallow, and as a result, the sharpness of the spiral blade is deteriorated.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a spiral rotor that suppresses the adhesion of soil or the like to the spiral rotor and hardly reduces the sharpness of the spiral blade.

  In order to solve such a problem, the present invention provides a spiral rotor that is mounted on an axle of a management machine and rotates as the axle rotates, and a rotation center shaft that is coaxially mounted on the axle, A pair of support portions provided along a plane substantially orthogonal to the axial direction of the rotation center axis on both sides in the axial direction of the rotation center axis, and a spiral blade connected between the pair of support portions; The spiral blade is characterized in that both end portions in the longitudinal direction are supported from the lateral direction on the inner surface of the corresponding support portion (Claim 1).

  Further, the support portion of the present invention is formed in an annular shape, and the spiral blade is connected and supported from the lateral direction to the inner surface of the corresponding support portion at both longitudinal ends thereof, and the radial direction of each outer periphery of the pair of support portions It extends between the outer positions (Claim 2).

  Further, the support portion of the present invention is formed in a disk shape, and the spiral blade is connected and supported from the lateral direction to the inner surface of the radially outer end portion of the support portion corresponding to both ends in the longitudinal direction. It extends between the positions of the outer periphery of each part in the radial direction (claim 3).

  Further, the support portion of the present invention is formed in a disc shape, and a plurality of protruding plate portions extending radially with respect to the rotation center axis with a predetermined interval in the circumferential direction are provided on the outer periphery of the support portion, The spiral blade has a longitudinal end connected to and supported by the inner surface of the tip of the protruding plate portion from the lateral direction (claim 4).

  According to the spiral rotor according to the present invention, it is possible to provide a spiral rotor that has the above-described characteristics and suppresses adhesion of soil or the like to the spiral rotor, and the sharpness of the spiral blade is hardly lowered.

The front side perspective view of the management machine with which the spiral rotor concerning one Embodiment of this invention was mounted | worn is shown. The partial front view of this management machine is shown. The partial top view of the spiral rotor used as a comparison object with the spiral rotor of this application is shown. The fragmentary top view of the spiral rotor concerning other embodiment of this invention is shown. The top view of the spiral rotor concerning other embodiment of this invention is shown. The side view of the spiral rotor concerning other embodiment of this invention is shown.

  The spiral rotor of the present invention will be described below with reference to FIGS. In this embodiment, a spiral rotor that can be attached to and detached from a walking type management machine will be described. First, before explaining the spiral rotor, the management machine will be outlined with reference to FIG. 1 and FIG.

  As shown in FIG. 1 (front perspective view) and FIG. 2 (partial front view), the management machine 1 has an engine 4 on the machine frame 3 and extends downward in the center in the width direction of the machine frame 3. 5, a pair of axles 7 project from both sides of the transmission case 5 in the width direction, and spiral rotors 20 and 20 ′ are attached to the axles 7. A cover portion 9 that covers the engine 4 is provided on the body frame 3. A pair of operation handles 11 are provided at the rear of the body frame 3 and extend obliquely rearward and upward from both sides in the width direction of the body frame 3. The engine 4 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.

  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 left side in the width direction will be described. About the same aspect part as the spiral rotor 20, the corresponding code | symbol is attached | subjected and the description is abbreviate | omitted.

  The spiral rotor 20 is connected to a rotation center shaft 31 mounted on the axle 7, a pair of support portions 21, 21 disposed on both sides in the axial direction of the rotation center shaft 31, and the support portions 21, 21. And a plurality of spiral blades 27.

  The rotation center shaft 31 is formed in a cylindrical shape with a hollow portion inside, and the axle 7 of the transmission case 5 is inserted into an opening on one side of the hole, and the rotation center shaft 31 and the axle 7 are inserted. The rotation center shaft 31 is connected to the axle 7 by a connecting pin (not shown) inserted therebetween. For this reason, the spiral rotor 20 can be removed from the axle 7 by removing the connecting pin from the rotation center shaft 31 and the axle 7.

  The support portion 21 includes an annular ring 21 a and a plurality of spokes 21 b that connect the ring 21 a and the rotation center shaft 31. The ring 21a is disposed coaxially with the rotation center shaft 31 by a plurality of spokes 21b. The radius of the ring 21a is smaller than the rotation radius of the spiral blade 27 connected between the pair of rings. For this reason, the ring 21a does not interfere with the cutting of grass or the like by the spiral blade 27.

  Both ends of the spiral blade 27 in the longitudinal direction are connected to the inner surface of the corresponding ring 21a by welding. That is, both ends in the longitudinal direction of the spiral blade 27 are connected and supported from the lateral direction on the inner surface of the ring 21a. A space S through which soil or the like can penetrate is formed on the back surface side of both ends in the longitudinal direction of the spiral blade 27. For this reason, there is no possibility that soil, grass, or the like is accumulated around the longitudinal end portion of the spiral blade 27.

  Further, since the spiral blade 27 extends between positions on the radially outer side of the pair of rings 21a, the rotation locus of the spiral blade 27 is located on the outer side of the outer diameter of the ring 21a. Therefore, when the spiral rotor 20 rotates, the contact depth of the spiral blade 27 can be made constant by the ring 21a when the spiral blade 27 contacts the surface of the field. Moreover, since the ring 21a and the spoke 21b connected thereto are thicker than the spiral blade 27, the strength of the spiral rotor 20 can be increased.

  Next, the operation of the spiral rotors 20 and 20 ′ when the grass and the like in the field are cut by the rotation of the spiral rotors 20 and 20 ′ will be described with reference to FIGS. FIG. 3 shows a partial plan view of the spiral rotor 40 compared with the spiral rotors 20 and 20 ′ of the present application.

  First, the spiral rotor 40 to be compared will be outlined. As shown in FIG. 3, the spiral rotor 40 has a pair of annular rings 41, 41 arranged on both sides in the width direction, and both ends of the spiral blade 43 are welded or the like on the outer periphery of the rings 41, 41. It is fixed. The ring 41 is formed by bending a rod-shaped member having a circular cross section into an annular shape. The both ends of the spiral blade 43 fixed to the rings 41, 41 are fixed on the outer peripheral surface of the rings 41, 41 at the rear side in the rotation direction (arrow B direction), and the outer sides of the rings 41, 41 are the front side in the rotation direction. Extends away from the A boss 45 that extends inward in the axial center direction of the ring 41 and can be attached to the axle 7 of the management machine 1 is supported on the ring 41 via a plurality of spokes 46 at the center of the ring 41 on one side in the width direction.

  Since the spiral blade 43 of the spiral rotor 40 as a comparison object extends in the direction away from the ring 41 along the rotation direction, the front end in the rotation direction of the longitudinal end portion thereof extends from the inner side of the end of the spiral blade 43 to the ring. A step 47 having a space 47 a is formed between the surface 41 and the surface of 41. For this reason, when the spiral rotor 40 is rotated, there is a possibility that soil, cut grass, or the like accumulates in the space 47 a of the step 47.

  On the other hand, the spiral blades 27 of the spiral rotors 20 and 20 ′ of the present application have both longitudinal ends thereof connected to the inner surface of the ring 21a as shown in FIG. 2 and extend outside the outer periphery of the ring 21a. Connected to the inner surface of the other ring 21a, a space S through which dirt or the like can penetrate is formed on the back surface side of the end portion in the longitudinal direction. For this reason, when the spiral rotors 20 and 20 ′ are rotated, the soil and the cut grass move so as to penetrate through the space S, so that there is no possibility that the soil and the grass are accumulated around the both ends in the longitudinal direction of the spiral blade 27. It is possible to prevent shallow penetration of the spiral blade 27 with respect to the soil or the like. Accordingly, it is possible to provide the spiral rotors 20 and 20 ′ in which the adhesion of soil or the like to the spiral rotors 20 and 20 ′ is suppressed and the sharpness of the spiral blade 27 is not easily lowered.

  In addition, although the spiral rotor 20 of the above-described embodiment is shown in which the support portions 21 on both sides in the width direction have an annular ring 21a, as shown in FIG. 4 (partial plan view), The support portion 21 on the left side in the axial direction may be formed in a disc shape. In this case, the disk-shaped support portion 21 has a radius rs that is substantially the same as the radius ra of the ring 21a of the support portion 21 on the other side. Further, the spiral blade 27 has a longitudinal end connected to and supported from the inner surface of the radially outer end of the disk-shaped support portion 21 from the lateral direction, and the radial directions of the outer circumferences of the pair of support portions 21 and 21. Extends between outer positions.

  For this reason, the spiral blade 27 is formed with a space S through which dirt or the like can be penetrated on the back surface side of the end portion on the disk-like support portion 21 side. The possibility of collecting grass or the like can be eliminated.

  Further, as shown in FIG. 5 (plan view) and FIG. 6 (side view), the support portion 21 of the spiral rotor 20 has a predetermined interval in the circumferential direction on the outer periphery of the disc portion 21c formed in a substantially circular shape when viewed from the side. And a plurality of projecting plate portions 21d extending radially and inclined to the front side in the rotational direction of the spiral rotor 20 may be used.

  The protruding plate portion 21d is formed so that its width decreases as it advances toward the tip side. The projecting direction of the projecting plate portion 21d is formed so as to extend in a direction orthogonal to the rotation center axis 31, or it extends radially inclining to the rear side of the spiral rotor 20 in the rotational direction (arrow A direction). May be. The longitudinal end of the spiral blade 27 is fixed to the inner surface of the tip of the protruding plate 21d by welding. That is, the longitudinal end portion of the spiral blade 27 is fixed in a state of being supported from the lateral direction inside the tip end portion of the protruding plate portion 21d.

  The width dimension of the spiral blade 27 is substantially the same as the width dimension of the tip portion of the protruding plate portion 21d. For this reason, the spiral blade 27 is continuously connected to the protruding plate portion 21d, and a space S through which dirt or the like can penetrate is formed on the back surface side of the longitudinal end portion of the spiral blade 27. For this reason, it is possible to eliminate the possibility that soil, grass, or the like is accumulated around the end portion of the spiral blade 27 in the longitudinal direction. Further, when the spiral rotor 20 rotates, the projecting plate portion 21d rotates so that the front end portion in the rotation direction of the projecting plate portion 21d is cut into the soil like the vertical blade portion of the tilling claw. There is no risk of soil or grass adhering.

  In addition, in the Example mentioned above, as shown in FIG. 2, the case where the axial direction both sides of the rotation center axis | shaft 31 were fixed to the support parts 21 and 21 arrange | positioned on both sides of the spiral rotors 20 and 20 'was shown. However, like the boss 45 shown in FIG. 4, a shaft whose length in the axial direction of the rotation center shaft 31 is shortened may be fixed to the support portion 21 on one side. 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.

DESCRIPTION OF SYMBOLS 1 Management machine 7 Axle 20, 20 'Spiral rotor 21 Support part 21d Projection board part 27 Spiral blade 31 Rotation center axis

Claims (4)

A spiral rotor that is mounted on the axle of the management machine and rotates with the rotation of the axle;
A rotation center shaft coaxially mounted on the axle;
A pair of support portions provided along a plane substantially orthogonal to the axial direction of the rotation center axis on both sides in the axial direction of the rotation center axis;
A spiral blade connected between the pair of support portions;
The spiral blade is characterized in that both ends of the spiral blade are supported from the lateral direction on the inner surface of the corresponding support portion. The support portion is formed in an annular shape,
The spiral blade is connected and supported from both sides in the longitudinal direction to the inner surface of the corresponding support portion, and extends between radially outer positions of the outer circumferences of the pair of support portions. The spiral rotor according to claim 1. The support portion is formed in a disc shape,
The spiral blade is connected and supported laterally to the inner surface of the radially outer end of the corresponding support portion at both longitudinal ends thereof, and extends between the radially outer positions of the outer circumferences of the pair of support portions. The spiral rotor according to claim 1, wherein: The support portion is formed in a disc shape,
On the outer periphery of the support portion, there are provided a plurality of protruding plate portions extending radially with respect to the rotation center axis with a predetermined interval in the circumferential direction,
2. The spiral rotor according to claim 1, wherein the spiral blade has an end portion in a longitudinal direction connected and supported on an inner surface of a tip portion of the protruding plate portion from a lateral direction.

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