Rotating body, brush cutter, and method for manufacturing the same

Abstract

The present invention provides a rotating body in which a metal fitting and a main body are firmly coupled, and a brush cutter equipped with the same. The rotating body (1) includes a metal fitting (2) and a resin main body (3) molded integrally with the metal fitting (2). The metal fitting (2) includes an insertion hole (20) and an annular portion (22) positioned to surround the insertion hole (20). The annular portion (22) has a first surface (221) and a second surface (222) facing opposite each other in an axial direction (D1). A plurality of protrusions (26) are formed on the first surface (221) at intervals in a circumferential direction (D2) of the annular portion (22). Each of the plurality of protrusions (26) is embedded in the main body (3).

Description

[Technical Field]

[0001] The present disclosure relates to a rotating body, a brush cutter, and a method for manufacturing a rotating body. [Background technology]

[0002] A rotating body attached to a brush cutter body is known (see Patent Document 1). The rotating body is attached to a drive rod of the brush cutter body and is rotated integrally with the drive rod. The rotating body includes a metal fitting and a resin body portion connected to the metal fitting. A user can cut grass using, for example, a rotary blade held between the metal fitting of the rotating body and the brush cutter body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-252213 Summary of the Invention

[0004] The problem to be solved by the present disclosure is to provide a rotating body in which a metal fitting and a main body are firmly connected, and a brush cutter including the same.

[0005] A rotor according to one aspect of the present disclosure includes a metal fitting secured to a drive rod of a brush cutter body and a resin main body integrally molded with the metal fitting. The metal fitting includes an insertion hole formed therethrough for inserting the drive rod therethrough and an annular portion positioned to surround the insertion hole. The annular portion has a first surface and a second surface facing opposite each other in the axial direction of the insertion hole. The first surface has a plurality of protrusions formed at intervals in the circumferential direction of the annular portion, and each of the plurality of protrusions is embedded in the main body.

[0006] A brush cutter according to one aspect of the present disclosure includes the rotating body and the brush cutter body.

[0007] A manufacturing method of a rotating body according to one embodiment of the present disclosure is a method of manufacturing the rotating body, in which the main body portion coupled to the metal fitting is molded by insert molding.

[0008] A method for manufacturing a rotating body according to another embodiment of the present disclosure is a method for manufacturing the rotating body, in which the multiple protrusions are formed by striking the second surface with a punch, and in the process, the tip of at least one of the protrusions is crushed to form a flange.

[0009] A manufacturing method for a rotating body according to yet another embodiment of the present disclosure is a method for manufacturing the rotating body, comprising the steps of forming the plurality of protrusions by striking a punch against the second surface, thereby crushing a tip of at least one of the protrusions, and forming a flange into a flared shape by striking a punch against the crushed tip of the at least one protrusion. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view of a brush cutter to which a rotating body according to a first embodiment is attached. [Figure 2] FIG. 2 is a cross-sectional view of the main part of the brush cutter, including the rotor. [Figure 3] FIG. 3 is a perspective view of the rotating body. [Figure 4] FIG. 4 is a plan view of the rotor of the same. [Figure 5] FIG. 5 is a plan view of a metal fitting provided on the rotating body of the same. [Figure 6] FIG. 6 is a cross-sectional view taken along line AA in FIG. [Figure 7] FIG. 7 is a cross-sectional view taken along line BB in FIG. [Figure 8] FIG. 8 is a cross-sectional view of a main part for explaining the first step. [Figure 9] FIG. 9 is a cross-sectional view of a main part for explaining the second step. [Figure 10] FIG. 10 is a plan view of the rotating body of the second embodiment. [Figure 11]FIG. 11 is a cross-sectional view of the rotor of the same. [Figure 12] FIG. 12 is a plan view of a rotating body according to the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] 1. One embodiment A rotating body, a brush cutter, and a method for manufacturing a rotating body according to an embodiment of the present disclosure will be described with reference to the accompanying drawings.

[0012] However, the embodiment described below is merely one of various embodiments of the present disclosure, and various modifications are possible depending on the design, etc., as long as the object of the present disclosure can be achieved. Also, the drawings showing the following embodiments are schematic diagrams and do not necessarily reflect actual dimensions.

[0013] (Brush cutter) As shown in FIGS. 1 and 2, the brush cutter 9 of the first embodiment comprises a brush cutter body 90 and a rotor 1 fixed to the tip of the brush cutter body 90.

[0014] (Brush cutter body) The brush cutter body 90 includes a main shaft 94, a drive rod 95 extending from the tip of the main shaft 94, and a receiver 96 connected to the outer periphery of the drive rod 95 so as to rotate integrally with the drive rod 95. The rotary blade 8 is detachably attached to the drive rod 95 using a rotor 1.

[0015] The brush cutter body 90 further includes a handle 97 attached midway along the main shaft 94, and an engine 98 attached to the rear end of the main shaft 94. It is also preferable that the brush cutter body 90 include an electric motor instead of the engine 98.

[0016] In the brush cutter 9 of the first embodiment, the output of the engine 98 is transmitted to the drive rod 95 via the main shaft 94. The rotor 1 is fixed to the drive rod 95. When the drive rod 95 is driven to rotate, the rotor 1 is driven to rotate integrally with the drive rod 95. At this time, the rotary blade 8 is driven to rotate integrally with the rotor 1.

[0017] (rotating body) The rotating body 1 includes a metal fitting 2 and a resin-made main body 3 molded integrally with the metal fitting 2. The metal fitting 2 and the main body 3 are joined by insert molding.

[0018] (Metal fittings) The metal fitting 2 is a member through which the drive rod 95 of the brush cutter 9 is inserted and which is fixed to the drive rod 95 using a fastening means. The fastening means is, for example, a nut 92 which is connected to the outer peripheral surface of the tip of the drive rod 95.

[0019] The metal fitting 2 is configured to detachably hold the rotary blade 8 between itself and a receiving part 96 provided on the brush cutter body 90, and to rotate the rotary blade 8 integrally with the drive rod 95.

[0020] The metal fitting 2 includes an insertion hole 20 formed through the center of the metal fitting 2 for inserting the drive rod 95, an annular portion 22 positioned so as to surround the entire circumference of the insertion hole 20, and a second annular portion 23 positioned between the annular portion 22 and the insertion hole 20. The second annular portion 23 is positioned so as to surround the entire circumference of the insertion hole 20.

[0021] (Annular part) The annular portion 22 of the fitting 2 has a first surface 221 and a second surface 222 that face opposite each other in the axial direction D1 of the insertion hole 20 (see FIG. 6, etc.). Hereinafter, the side to which the first surface 221 faces in the axial direction D1 will be referred to as the "first side," and the side to which the second surface 222 faces in the axial direction D1 will be referred to as the "second side."

[0022] The first surface 221 has an annular outer shape that surrounds the insertion hole 20. The second surface 222 has an annular outer shape that surrounds the insertion hole 20.

[0023] A plurality of through holes 24 are formed at intervals in the circumferential direction D2 in the annular portion 22 of the fitting 2 (see FIG. 5, etc.). The circumferential direction D2 is the circumferential direction of the fitting 2, which has an annular shape as a whole, and is also the circumferential direction of the annular portion 22 and the second annular portion 23.

[0024] The plurality of through holes 24 are eight through holes 24 formed at equal intervals in the circumferential direction D2. Each through hole 24 is a stepped through hole 24. In each through hole 24, the opening area at the second surface 222 is larger than the opening area at the first surface 221. Each through hole 24 penetrates the annular portion 22 in the axial direction D1. Each through hole 24 includes a small diameter portion 241 that is a portion on the first side, and a large diameter portion 242 that is a portion on the second side. The small diameter portion 241 and the large diameter portion 242 are positioned on a straight line in the axial direction D1. The large diameter portion 242 is formed so that the diameter becomes larger as it approaches the second side (i.e., the portion closer to the second surface 222).

[0025] In the rotating body 1 of the first embodiment, resin 30 (see Figure 2), which constitutes part of the main body 3, is filled into each through hole 24, thereby firmly bonding the metal fittings 2 to the main body 3, and preventing the main body 3 and the metal fittings 2 from separating when a large external force is applied to the rotating body 1.

[0026] 2, a first surface 221 of the annular portion 22 is covered by the main body portion 3. As shown in FIG. 4, a second surface 222 of the annular portion 22 is not covered by the main body portion 3 and is exposed.

[0027] (multiple protrusions) A plurality of protrusions 26 are formed on the first surface 221 of the annular portion 22 at intervals in the circumferential direction D2 of the annular portion 22. The plurality of protrusions 26 are eight protrusions 26 formed at equal intervals in the circumferential direction D2.

[0028] In the rotating body 1 of the first embodiment, each of the multiple protrusions 26 protruding from the first surface 221 of the annular portion 22 is embedded in the resin main body 3, thereby more firmly fixing the metal fitting 2 and the main body 3 together.

[0029] The common structure of the plurality of protrusions 26 will be described below.

[0030] The outer peripheral surface of the protrusion 26 includes an uneven portion 262. The uneven portion 262 is configured with a flange 264 provided on the protrusion 26. The flange 264 has a shape that expands radially outward of the protrusion 26. The flange 264 is provided around the entire circumference of the protrusion 26.

[0031] In the rotating body 1 of the first embodiment, the flange 264 of the projection 26 has a flared shape that widens as it approaches the tip. In other words, the flared shape is a trumpet shape.

[0032] In the rotating body 1 of the first embodiment, the entire protrusion 26 has a flared shape that widens as it approaches the tip. The flared protrusion 26 is formed so that the portion closer to the tip becomes thinner.

[0033] A hollow portion 260 is provided in the center of the protrusion 26. The hollow portion 260 is open at the tip of the protrusion 26. The hollow portion 260 is open to a first side in the axial direction D1. The hollow portion 260 is formed so that the diameter increases as it approaches the tip of the protrusion 26.

[0034] As shown in FIG. 7, in a cross section perpendicular to the first surface 221 of the metal fitting 2, the outer peripheral surface of the protrusion 26 is warped so that the angle with the central axis of the protrusion 26 increases toward the tip.

[0035] (multiple dents) A plurality of recesses 28 are formed in the second surface 222 of the annular portion 22 at intervals in the circumferential direction D2 of the annular portion 22. The plurality of recesses 28 are respectively arranged on the backside of the plurality of protrusions 26 of the annular portion 22. In other words, the plurality of recesses 28 are arranged in a one-to-one relationship on the backside of the plurality of protrusions 26 of the annular portion 22.

[0036] It is preferable that one of the plurality of recesses 28 and one of the plurality of protrusions 26 corresponding to one of the recesses 28 are arranged so that their central axes coincide with each other. The plurality of recesses 28 is eight recesses 28 formed at equal intervals in the circumferential direction D2.

[0037] The common structure of the plurality of recesses 28 will be described below.

[0038] The recess 28 has a circular cross section. The cross section here is a cross section perpendicular to the axial direction D1. The central axis of the recess 28 coincides with the central axis of the protrusion 26 located on the rear side of the recess 28 in the annular portion 22. The diameter of the recess 28 is smaller than the outer diameter of the protrusion 26 located on the rear side of the recess 28 in the annular portion 22.

[0039] As shown in FIG. 5 and other figures, the second surface 222 of the annular portion 22 has a plurality of recesses 28 and a plurality of through holes 24 arranged alternately in the circumferential direction D2 surrounding the insertion hole 20.

[0040] In other words, the openings of the multiple recesses 28 and the openings of the multiple through holes 24 in the second surface 222 are alternately arranged in the circumferential direction D2 on the second surface 222 of the annular portion 22. The openings of the multiple recesses 28 are each circular. The openings of the multiple through holes 24 in the second surface 222 are each circular. The opening area of ​​each of the multiple recesses 28 is smaller than the opening area of ​​any of the multiple through holes 24. The opening diameter of each of the multiple recesses 28 is smaller than the opening diameter of any of the multiple through holes 24.

[0041] Among the plurality of through holes 24, one corresponding recess 28 is located between two through holes 24 that are adjacent to each other in the circumferential direction D2. The two through holes 24 that are adjacent to each other in the circumferential direction D2 and the one recess 28 located between these two through holes 24 are located at equal intervals in the circumferential direction D2.

[0042] Among the plurality of recesses 28, one corresponding through hole 24 is located between two recesses 28 that are located adjacent to each other in the circumferential direction D2. The two recesses 28 that are located adjacent to each other in the circumferential direction D2 and the one through hole 24 located between these two recesses 28 are located at equal intervals in the circumferential direction D2.

[0043] (ridge) A raised portion 29, which is raised higher than the other portions of the second surface 222, is formed on the second surface 222 of the annular portion 22 so as to surround the insertion hole 20. The raised portion 29 is configured so as to contact the rotary blade 8 over its entire circumference. The rotary blade 8 is clamped between the raised portion 29 of the metal fitting 2 and the receiver 96 of the brush cutter body 90.

[0044] The raised portion 29 is divided in the circumferential direction D2 by a plurality of through holes 24. In other words, the raised portion 29 is made up of a plurality of arcuate raised portions 291 positioned at intervals from each other in the circumferential direction D2.

[0045] The multiple arcuate raised portions 291 and the multiple through holes 24 are positioned alternately in the circumferential direction D2. Each of the multiple arcuate raised portions 291 is positioned between two of the multiple through holes 24 that are positioned adjacent to each other in the circumferential direction D2.

[0046] The plurality of recesses 28 are provided so as to open at the raised portions 29. Each of the plurality of recesses 28 is provided so as to open at the middle portion in the circumferential direction D2 of a corresponding one of the plurality of arcuate raised portions 291. The plurality of recesses 28 and the plurality of arcuate raised portions 291 correspond one-to-one.

[0047] (Second annular portion) The second annular portion 23 is located on the first side in the axial direction D1 relative to the annular portion 22. In other words, the second annular portion 23 is located on the side of the metal fitting 2 on which the main body portion 3 is located in the axial direction D1.

[0048] The through hole at the center of the second annular portion 23 is an insertion hole 20 that penetrates in the axial direction D1.

[0049] (Slanted wall) Furthermore, the metal fitting 2 includes a sloping wall portion 21. The sloping wall portion 21 is an annular portion located between the annular portion 22 and the second annular portion 23. The sloping wall portion 21 is sloping around its entire circumference so as to connect the annular portion 22 and the second annular portion 23. The inclination of the inner peripheral surface of the sloping wall portion 21 is uniform over its entire circumference.

[0050] The inner peripheral surface of the inclined wall portion 21 has a circular cross section. This cross section is perpendicular to the axial direction D1. The cross-sectional shape of the inclined wall portion 21 has a smaller diameter toward the first side in the axial direction D1.

[0051] (Main body) As shown in FIGS. 2 and 3, the main body 3 includes a recess 32 that receives the tip of the drive rod 95, and a grounding portion 35 that is formed to surround the recess 32.

[0052] The recess 32 of the main body 3 accommodates the portion of the drive rod 95 that protrudes from the insertion hole 20 of the metal fitting 2, and a nut 92 that is threaded onto this portion. The second annular portion 23 of the metal fitting 2 is exposed at the bottom surface of the recess 32.

[0053] The ground contact portion 35 is configured to be in sliding contact with the ground E. The outer peripheral surface of the ground contact portion 35 is a ground contact surface 352 that is inclined so that the radially outer portions are positioned closer to the second side in the axial direction D1.

[0054] (Manufacturing method of rotating body) A method for manufacturing the rotating body 1 of the first embodiment will be described below.

[0055] The manufacturing method of the rotating body 1 of the first embodiment includes a first molding step of molding the metal fitting 2, and a second molding step of molding the main body 3 joined to the metal fitting 2 by insert molding.

[0056] (1st molding process) The first molding step includes a main step of molding the main portion of the metal fitting 2 and an additional step of molding the plurality of protrusions 26 and the plurality of recesses 28 of the metal fitting 2.

[0057] In the main process, a flat metal sheet is pressed to form a work-in-progress 2A of the metal fitting 2. In other words, the press working here is a drawing process. The flat metal sheet that forms the basis of the metal fitting 2 is, for example, a flat metal sheet in the shape of a ring.

[0058] In the work-in-progress 2A of the metal fitting 2 formed in the main process, the multiple protrusions 26 and the multiple recesses 28 are not formed. major In this process, the metal fitting 2 is molded except for the multiple protrusions 26 and multiple recesses 28. In the work-in-progress 2A of the metal fitting 2, the insertion hole 20, the inclined wall portion 21, the annular portion 22, the second annular portion 23, the through-hole 24, and the raised portion 29 have already been formed.

[0059] In an additional step, the annular portion 22 formed in the work-in-progress 2A of the metal fitting 2 is subjected to a press process to further form a plurality of protrusions 26, each having a flange 264, and a plurality of recesses 28. The plurality of protrusions 26, each having a flange 264, are formed by the first and second steps described below.

[0060] 8, in a first step included in the additional steps, a punch 51 is struck against the second surface 222 of the annular portion 22 to apply a press, thereby forming the protrusion 26 protruding from the first surface 221. The punch 51 is struck against the raised portion 29 of the second surface 222.

[0061] In the first step, a die 56 supporting the first surface 221 of the annular portion 22 is preferably provided with a recess 563. By using the punch 51 to push out a part of the annular portion 22 to the first side in the axial direction D1, a protrusion 26 is formed on the first surface 221 of the annular portion 22, and a recess is formed on the second surface 222 of the annular portion 22. 28 At this time, the tip of the projection 26 hits the bottom surface of the recess 563 and is crushed, forming a flange 264 at the tip of the projection 26 (see FIG. 9). At this stage, the flange 264 is not flared.

[0062] In the second step included in the additional steps, as shown in Fig. 9, a punch 52 is further struck against the flattened tip of the protrusion 26 to press it, thereby forming a flared flange 264. In other words, the flared flange 264 of the protrusion 26 of the metal fitting 2 included in the rotating body 1 of the first embodiment is formed through the above-described first and second steps. The punch 52 is preferably a different punch having a smaller diameter than the punch 51 used in the first step.

[0063] 9, punch 52 is positioned below work-in-progress 2A of metal fitting 2, but it is also preferable to perform the second step with this positional relationship reversed upside down. In other words, after performing the first step, it is also preferable to turn work-in-progress 2A of metal fitting 2 upside down and place it on die 57, and then strike punch 52 from above work-in-progress 2A of metal fitting 2.

[0064] In the second step, the die 57 supporting the second surface 222 of the annular portion 22 is preferably provided with a protrusion 573 that fits into the recess 28. As the protrusion 26 is further crushed between the protrusion 573 of the die 57 and the punch 52 that is struck against it, a hollow portion 260 is formed in the center of the protrusion 26, and the flange 264 of the protrusion 26 is formed into a flared shape.

[0065] (Second molding process) The second molding step is carried out after the first molding step.

[0066] In the second molding step, a resin body 3 is molded by insert molding, which is firmly bonded to the metal fitting 2. At this time, each of the multiple stepped through holes 24 is filled with resin 30 that forms part of the body 3, and the multiple protrusions 26, each with a flared flange 264, are embedded in the resin body 3, resulting in an extremely strong bond between the metal fitting 2 and the body 3.

[0067] (Action and effect) According to the rotating body 1 of the first embodiment described above, the metal fitting 2 and the main body 3 are bonded together much more firmly than in the prior art. For example, a test conducted at the Mie Prefectural Industrial Research Institute in Japan using an Amsler-type universal testing machine also showed that the metal fitting 2 and the main body 3 of the rotating body 1 of the first embodiment are bonded together much more firmly than in the rotating bodies of the prior art. The details are as follows.

[0068] A load was applied in the axial direction D1 to the metal fitting 2 of the rotating body 1 of the first embodiment, and the load at which the rotating body 1 broke was measured. The rotating body 1 was boiled for one hour and then tested three days later. A total of 16 tests were conducted, and it was confirmed that the rotating body 1 broke at an average load of 5733 N. In all cases, breakage occurred in the main body 3 before the metal fitting 2 came off from the main body 3, and the breakage of the main body 3 caused the rotating body 1 to break. In other words, in the rotating body 1 of the first embodiment, the connection between the metal fitting 2 and the main body 3 was maintained until breakage occurred in the main body 3 itself.

[0069] In the tests on the conventional rotating body, the rotating body 1 of the first embodiment, with only the multiple protrusions 26 of the metal fitting 2 removed, was used as the conventional rotating body. In this case, tests conducted under the same conditions confirmed that the rotating body 1 broke under an average load of 2646 N. In both cases, the rotating body 1 broke when the metal fitting 2 came off the main body 3 before the main body 3 broke.

[0070] From the above, it has been confirmed that in the rotating body 1 of the first embodiment, the metal fitting 2 is provided with multiple protrusions 26, which results in an extremely strong bond between the metal fitting 2 and the main body 3 compared to conventional technology.

[0071] 2. Second embodiment The rotating body 1 of the second embodiment will be described with reference to Figures 10 and 11. In the following description, the same components as those in the first embodiment will be denoted by the same reference numerals and detailed description will be omitted, and only components different from those in the first embodiment will be described.

[0072] The rotating body 1 of the second embodiment includes a metal fitting 2 having the same configuration as that of the first embodiment, and a main body 3 made of synthetic resin that is joined to the metal fitting 2. The main body 3 includes an upper body 31 that is joined to the metal fitting 2, a ground contact portion 35 located below the upper body 31, and a flange portion 38 that is located between the upper body 31 and the ground contact portion 35.

[0073] In the rotating body 1 of the second embodiment, resin 30 that constitutes part of the upper body 31 of the main body 3 is filled into each of the through holes 24 of the metal fitting 2. In addition, each of the protrusions 26 of the metal fitting 2 is embedded in the upper body 31. The grounding portion 35 is an annular grounding part with a through hole that constitutes part of the recess 32 provided in the center.

[0074] The flange portion 38 has a larger diameter than the upper body 31 and the ground contact portion 35. The flange portion 38 has a smaller diameter than the rotary blade 8.

[0075] Furthermore, the main body 3 is provided with a locking structure for locking the linear cutter 6. A plurality of pull-out openings 36 are provided on the outer circumferential surface of the upper body 31, through which the linear cutter 6 locked by the locking structure can be pulled out. The linear cutter 6 pulled out from the pull-out openings 36 is positioned above the flange portion 38.

[0076] With the rotating body 1 of the second embodiment, it is possible to mow grass using the rotary blade 8 sandwiched between the metal fitting 2 and the receiving tool 96 of the brush cutter body 90, and the linear cutter 6 attached to the main body 3. It is also possible to mow grass using only the linear cutter 6, without sandwiching the rotary blade 8 between the metal fitting 2 and the receiving tool 96 of the brush cutter body 90. It is also possible to mow grass using only the rotary blade 8 sandwiched between the metal fitting 2 and the receiving tool 96 of the brush cutter body 90.

[0077] In the rotating body 1 of the second embodiment, the upper body 31, the flange portion 38, and the ground contact portion 35 are each molded separately, but it is also preferable that the upper body 31 be molded integrally with the flange portion 38. It is also preferable that the ground contact portion 35 be molded integrally with the flange portion 38. It is also preferable that the upper body 31, the flange portion 38, and the ground contact portion 35 be molded integrally.

[0078] 3. Third embodiment A rotating body 1 according to the third embodiment will be described with reference to Fig. 12. In the following description, the same components as those in the first embodiment will be denoted by the same reference numerals and detailed description will be omitted, and only components different from those in the first embodiment will be described in detail.

[0079] The rotating body 1 of the third embodiment comprises a metal fitting 2 having the same configuration as that of the first embodiment, a main body 3 made of synthetic resin that is connected to the metal fitting 2, and a bobbin 4 that is removably attached to the main body 3 and rotates integrally with the main body 3.

[0080] The main body 3 has a tubular portion 33 to which the metal fitting 2 is connected, a flange-shaped grounding portion 35 extending radially outward from the lower part of the tubular portion 33, and a plurality of withdrawal holes 37 formed through the grounding portion 35.

[0081] The bobbin 4 has an inner peripheral surface that detachably contacts the outer peripheral surface of the cylindrical portion 33, and an outer peripheral surface around which the flexible linear cutter 7 is wound. Both ends of the linear cutter 7 wound around the outer peripheral surface of the bobbin 4 are pulled out radially outward through two of the multiple pull-out holes 37.

[0082] The bobbin 4 further has a plurality of elastic pieces 43 that elastically press against the outer circumferential surface of the cylindrical portion 33, and a plurality of grooves 45 that allow the plurality of elastic pieces 43 to bend radially outward.

[0083] With the rotating body 1 of the third embodiment, it is possible to mow grass using the rotary blade 8 sandwiched between the metal fitting 2 and the receiving fixture 96 of the brush cutter body 90, and the linear cutter 7 attached to the main body 3 via the bobbin 4. It is also possible to mow grass using only the linear cutter 7, without sandwiching the rotary blade 8 between the metal fitting 2 and the receiving fixture 96 of the brush cutter body 90. It is also possible to mow grass using only the rotary blade 8 sandwiched between the metal fitting 2 and the receiving fixture 96 of the brush cutter body 90.

[0084] 4. Variations The above-described embodiment is merely one of various embodiments of the present disclosure, and various modifications can be made to the above-described embodiment as long as the object of the present disclosure can be achieved.

[0085] Modifications of the above embodiment will be described below. In the description of the modifications, the same components as those described in the above embodiment will be denoted by the same reference numerals and detailed description will be omitted. The various modifications listed below can be applied in appropriate combination.

[0086] In the above embodiment, the number of through holes 24 is eight, but the number of through holes 24 is not limited to this and may be two or more. In the above embodiment, the multiple through holes 24 are positioned at equal intervals in the circumferential direction D2, but they may not be positioned at equal intervals.

[0087] In the above embodiment, the number of protrusions 26 is eight, but the number of protrusions 26 is not limited to this and may be two or more. In the above embodiment, the multiple protrusions 26 are positioned at equal intervals in the circumferential direction D2, but they may not be positioned at equal intervals.

[0088] In the above embodiment, the number of recesses 28 is eight, but the number of recesses 28 is not limited to this and may be any number equal to or greater than two. In the above embodiment, the recesses 28 are positioned at equal intervals in the circumferential direction D2, but they may not be positioned at equal intervals.

[0089] In the above embodiment, all of the plurality of protrusions 26 have the flanges 264 , but this is not essential, and it is sufficient that at least one of the plurality of protrusions 26 has the flange 264 .

[0090] In the above embodiment, the flanges 264 of all of the plurality of protrusions 26 are flared, but this is not essential; it is sufficient that the flange 264 of at least one of the plurality of protrusions 26 is flared. For example, the flange 264 of at least one of the plurality of protrusions 26 may have a shape as shown in Fig. 9. Even in this case, it has been confirmed through testing that the metal fitting 2 and the main body 3 are joined more firmly than in the prior art.

[0091] In the above embodiment, the uneven portion 262 of the projection 26 is configured with the flange 264 , but the uneven portion 262 on the outer circumferential surface of the projection 26 may be configured in a form that does not include the flange 264 .

[0092] In the above embodiment, the flange 264 is provided at the tip of the protrusion 26, but the flange 264 may be provided at a portion of the protrusion 26 other than the tip.

[0093] In the above embodiment, the second surface 222 of the fitting 2 has a plurality of recesses 28 and a plurality of through holes 24 arranged alternately in the circumferential direction D2, but the arrangement is not limited to this. Also, the second surface 222 of the fitting 2 has raised portions 29, but it is possible that such raised portions 29 are not provided on the second surface 222.

[0094] In the above embodiment, it is assumed that the rotating body 1 is mainly used in contact with the ground E, but this is not limited to this, and it may also be assumed that the rotating body 1 is used floating above the ground E.

[0095] In the above embodiment, the multiple protrusions 26 of the fitting 2 are formed by striking with the punches 51, 52, but other methods can also be used as long as they can form the multiple protrusions 26 on the fitting 2.

[0096] 5. Summary As described based on the above embodiment and modified examples, the rotating body (1) of the first aspect includes a metal fitting (2) fixed to a drive rod (95) of a brush cutter body (90) and a resin main body (3) molded integrally with the metal fitting (2). The metal fitting (2) includes an insertion hole (20) formed therethrough for inserting the drive rod (95) therethrough and an annular portion (22) positioned to surround the insertion hole (20). The annular portion (22) has a first surface (221) and a second surface (222) facing opposite each other in the axial direction (D1) of the insertion hole (20). A plurality of protrusions (26) are formed on the first surface (221) at intervals in the circumferential direction (D2) of the annular portion (22), and each of the plurality of protrusions (26) is embedded in the main body (3).

[0097] According to this embodiment, the multiple protrusions (26) of the metal fittings (2) are embedded in the resin body portion (3), thereby providing a rotating body (1) in which the metal fittings (2) and the body portion (3) are firmly bonded together.

[0098] In the rotating body (1) of the second embodiment, the outer circumferential surface of at least one of the plurality of protrusions (26) of the first embodiment includes an uneven portion (262).

[0099] According to this embodiment, the protrusion (26) including the uneven portion (262) on the outer circumferential surface is embedded in the resin body portion (3), so that the metal fitting (2) and the body portion (3) are more firmly joined.

[0100] In the rotating body (1) of the third embodiment, at least one of the plurality of protrusions (26) in the first embodiment has a flange (264).

[0101] According to this embodiment, the projection (26) having the flange (264) is embedded in the resin body (3), so that the metal fitting (2) and the body (3) are joined together more firmly.

[0102] In the rotating body (1) of the fourth embodiment, the flange (264) of the third embodiment has a flared shape that widens toward the tip.

[0103] According to this embodiment, the protrusion (26) having the flared flange (264) is embedded in the resin body (3), so that the metal fitting (2) and the body (3) are joined together more firmly.

[0104] In the rotating body (1) of the fifth aspect, in any one of the first to fourth aspects, a plurality of recesses (28) are formed at intervals in the circumferential direction (D2) on the second surface (222) of the metal fitting (2). The plurality of recesses (28) are respectively arranged on the back sides of the plurality of protrusions (26) of the annular portion (22).

[0105] According to this embodiment, the recesses (28) are provided on the rear side of each of the projections (26), thereby reducing the overall weight of the metal fitting (2).

[0106] In the sixth aspect of the rotating body (1), in any one of the first to fifth aspects, a plurality of through holes (24) filled with a resin (30) constituting a part of the main body portion (3) are formed in the annular portion (22) of the metal fitting (2) at intervals in the circumferential direction (D2).

[0107] According to this embodiment, the resin (30) is filled into each of the plurality of through holes (24) of the metal fitting (2), so that the metal fitting (2) and the main body (3) are more firmly joined together.

[0108] In the rotating body (1) of the seventh aspect, in the fifth aspect, a plurality of through holes (24) filled with a resin (30) constituting a part of the main body (3) are formed at intervals in the circumferential direction (D2) in the annular portion (22) of the metal member (2). A plurality of recesses (28) and a plurality of through holes (24) are alternately arranged in the circumferential direction (D2) in the second surface (222) of the metal member (2).

[0109] According to this embodiment, the metal fitting (2) and the main body portion (3) are joined in a well-balanced manner in the circumferential direction (D2).

[0110] In the rotating body (1) of the eighth embodiment, in the fifth embodiment, a raised portion (29) that is raised higher than other portions of the second surface (222) is formed on the second surface (222) so as to surround the insertion hole (20). The plurality of recesses (28) are open at the raised portion (29).

[0111] According to this embodiment, the rotary blade (8) can be placed against the raised portion (29) and stably held between the raised portion (29) and the brush cutter body (90).

[0112] In the ninth aspect of the rotating body (1), in any one of the first to eighth aspects, the metal fitting (2) is configured to detachably clamp the rotary blade (8) between itself and the brush cutter body (90), and to rotate the rotary blade (8) integrally with the drive rod (95).

[0113] According to this embodiment, the rotary blade (8) can be rotated integrally with the drive rod (95), thereby enabling stable mowing work.

[0114] In the rotating body (1) of the 10th aspect, in any one of the 1st to 9th aspects, the main body portion (3) includes a recess (32) in which the tip end of the drive rod (95) is accommodated, and a ground portion (35) formed to surround the recess (32).

[0115] According to this embodiment, the rotary blade (8) rotates integrally with the drive rod (95), and the ground contact portion (35) of the rotating body (1) slides against the ground (E), allowing stable mowing work.

[0116] In the rotating body (1) of the eleventh aspect, in any one of the first to tenth aspects, the metal fitting (2) and the main body part (3) are joined by insert molding.

[0117] According to this embodiment, the metal fitting (2) and the main body (3) are more firmly joined together.

[0118] The brush cutter (9) of the twelfth embodiment includes the rotating body (1) of any one of the first to eleventh embodiments and a brush cutter body (90).

[0119] According to this aspect, a brush cutter (9) is provided that includes a rotating body (1) in which a metal fitting (2) and a main body (3) are firmly coupled together.

[0120] The manufacturing method of the rotating body (1) of the 13th aspect is a method of manufacturing any one of the rotating bodies (1) of the 1st to 10th aspects, in which the main body portion (3) joined to the metal fittings (2) is molded by insert molding.

[0121] According to this embodiment, the rotating body (1) is provided in which the metal fitting (2) and the main body (3) are more firmly joined together.

[0122] The manufacturing method of the rotating body (1) of the 14th aspect is a method of manufacturing the rotating body (1) of the third or fourth aspect, in which a plurality of protrusions (26) are formed by striking the second surface (222) with a punch (51), and in the process, the tip of at least one of the protrusions (26) is crushed to form a flange (264).

[0123] According to this embodiment, the rotating body (1) in which the metal fitting (2) and the main body (3) are firmly joined can be efficiently manufactured.

[0124] The manufacturing method of the rotating body (1) of the 15th aspect is a manufacturing method of the rotating body (1) of the 4th aspect, and includes the steps of forming a plurality of protrusions (26) by striking a punch (51) against the second surface (222), thereby crushing the tip of at least one of the protrusions (26), and striking a punch (52) against the crushed tip of at least one of the protrusions (26), thereby forming a flange (264) into a flared shape.

[0125] According to this embodiment, the rotating body (1) in which the metal fitting (2) and the main body (3) are firmly joined can be efficiently manufactured.

Claims

1. a metal fitting fixed to a drive rod of the brush cutter body; a resin main body portion integrally molded with the metal fitting, the metal fitting includes an insertion hole formed through the metal fitting for inserting the drive rod therethrough, and an annular portion positioned so as to surround the insertion hole, the annular portion has a first surface and a second surface facing opposite to each other in an axial direction of the insertion hole, A plurality of protrusions are formed on the first surface at intervals in the circumferential direction of the annular portion, and each of the plurality of protrusions is embedded in the main body portion. Rotating body.

2. An outer circumferential surface of at least one of the plurality of protrusions includes an uneven portion. The rotating body of claim 1.

3. At least one of the plurality of protrusions has a flange. The rotating body of claim 1.

4. The flange has a flared shape that widens toward the tip. The rotating body according to claim 3.

5. A plurality of recesses are formed on the second surface of the metal fitting at intervals in the circumferential direction, The plurality of recesses are respectively disposed on the rear sides of the plurality of protrusions in the annular portion. The rotating body of claim 1.

6. A plurality of through holes filled with a resin constituting a part of the main body are formed in the annular portion of the metal fitting at intervals in the circumferential direction. The rotating body of claim 1.

7. a plurality of through holes filled with a resin constituting a part of the main body are formed in the annular portion of the metal fitting at intervals in the circumferential direction, The second surface of the metal member has the plurality of recesses and the plurality of through holes alternately arranged in the circumferential direction. The rotating body according to claim 5.

8. a raised portion raised higher than other portions of the second surface is formed on the second surface so as to surround the insertion hole; The plurality of recesses are open at the raised portion. The rotating body according to claim 5.

9. The metal fitting is configured to detachably clamp the rotary blade between itself and the brush cutter body, and to rotate the rotary blade integrally with the drive rod. The rotating body of claim 1.

10. The main body portion includes a recessed portion that receives the tip end of the drive rod, and a grounding portion that is formed to surround the recessed portion. The rotating body of claim 1.

11. The metal fitting and the main body are joined by insert molding. The rotating body of claim 1.

12. A rotating body according to any one of claims 1 to 11; The brush cutter body, Brush cutter.

13. A method for manufacturing the rotating body according to any one of claims 1 to 10, comprising: The main body portion coupled to the metal fitting is molded by insert molding. Manufacturing method of a rotating body.

14. A method for manufacturing the rotating body of claim 3 or 4, comprising: The plurality of protrusions are formed by striking a punch against the second surface, and at that time, a tip portion of the at least one protrusion is crushed to form the flange. Manufacturing method of a rotating body.

15. A method for manufacturing the rotating body of claim 4, comprising the steps of: forming the plurality of protrusions by striking a punch against the second surface, and crushing a tip portion of at least one of the protrusions; and striking the crushed tip portion of the at least one protrusion with a punch to form the flange into a flared shape. Manufacturing method of a rotating body.

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