JP2021103945A

JP2021103945A - Tillage claw

Info

Publication number: JP2021103945A
Application number: JP2019235700A
Authority: JP
Inventors: 池田　俊朗; Toshiaki Ikeda; 俊朗池田; 亮人五十嵐; Akihito Igarashi
Original assignee: NIPPON HOOKU KK; Matsuyama Plow Manufacturing Co Ltd
Current assignee: NIPPON HOOKU KK; Matsuyama Plow Manufacturing Co Ltd
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2021-07-26
Anticipated expiration: 2039-12-26
Also published as: JP7219921B2

Abstract

To provide a tillage claw capable of improving durability.SOLUTION: A tillage claw 35 includes a claw body part 41, and a hard part 42 provided on the front/rear surfaces of the claw body part 41. The claw body part 41 has a thin plate part 51 on a blade edge side formed mutually in parallel on the front/rear surfaces, and a thick plate part 52 thicker than the thin plate part 51. The hard part 42 has a front surface hard part 71 positioned from a surface of the thin plate part 51 over a surface of the thick plate part 52, and a rear surface hard part 72 positioned from a rear surface of the thin plate part 51 over a rear surface of the thick plate part 52.SELECTED DRAWING: Figure 2

Description

本発明は、農作業機の回転軸に取り付けられる耕耘爪に関するものである。 The present invention relates to a tillage claw attached to a rotating shaft of an agricultural work machine.

従来、例えば下記の特許文献１に記載された耕耘爪が知られている。 Conventionally, for example, the tillage claw described in Patent Document 1 below is known.

この従来の耕耘爪は、金属材料からなる爪本体部と、この爪本体部の表面及び裏面に溶着等により設けられ、当該爪本体部の金属材料よりも硬質な金属材料からなる硬質金属部を備えている。このため、硬質金属部が爪本体部に設けられていない構成に比べて、耐久性は良好である。 This conventional tillage claw is provided with a claw body made of a metal material and a hard metal part made of a metal material that is harder than the metal material of the claw body, which is provided on the front surface and the back surface of the claw body by welding or the like. I have. Therefore, the durability is good as compared with the configuration in which the hard metal portion is not provided on the claw body portion.

意匠登録第１５６１８９４号公報Design Registration No. 1561894

しかしながら、上記従来の耕耘爪においては、例えば爪本体部（母材）が先に摩耗して硬質金属部（溶着金属）がそれに連られて欠けて摩耗してしまう場合等があり、より良好な耐久性が求められている。 However, in the above-mentioned conventional tillage claw, for example, the claw body portion (base material) may be worn first, and the hard metal portion (welded metal) may be connected to the claw body portion (welded metal) to be chipped and worn, which is better. Durability is required.

本発明は、このような点に鑑みなされたもので、耐久性の向上を図ることができる耕耘爪を提供することを目的とする。 The present invention has been made in view of such a point, and an object of the present invention is to provide a tillage claw capable of improving durability.

請求項１記載の耕耘爪は、農作業機の回転軸に取り付けられる耕耘爪であって、爪本体部と、前記爪本体部の表面及び裏面に設けられ、前記爪本体部よりも硬質な硬質部とを備え、前記爪本体部は、刃縁側に位置し、表面及び裏面が互いに平行状に形成された薄板部分と、峰縁側に位置し、前記薄板部分よりも厚い厚板部分とを有し、前記硬質部は、前記薄板部分の表面から前記厚板部分の表面にわたって設けられた表面硬質部分と、前記薄板部分の裏面から前記厚板部分の裏面にわたって設けられた裏面硬質部分とを有するものである。 The cultivated claw according to claim 1 is a cultivated claw attached to a rotating shaft of an agricultural work machine, and is provided on the claw main body and the front and back surfaces of the claw main body and is harder than the claw main body. The claw body portion has a thin plate portion located on the blade edge side and having a front surface and a back surface formed in parallel with each other, and a thick plate portion located on the peak edge side and thicker than the thin plate portion. The hard portion has a surface hard portion provided from the surface of the thin plate portion to the surface of the thick plate portion, and a back surface hard portion provided from the back surface of the thin plate portion to the back surface of the thick plate portion. Is.

請求項２記載の耕耘爪は、請求項１記載の耕耘爪において、爪本体部における薄板部分と厚板部分との段差は、硬質部の存在によって外部から認識不能となっているものである。 The tillage claw according to claim 2 is the tillage claw according to claim 1, wherein the step between the thin plate portion and the thick plate portion in the claw body portion cannot be recognized from the outside due to the presence of the hard portion.

請求項３記載の耕耘爪は、請求項１又は２記載の耕耘爪において、表面硬質部分は、薄板部分の表面の全部及び厚板部分の表面の少なくとも一部にわたって設けられ、裏面硬質部分は、薄板部分の裏面の全部及び厚板部分の裏面の少なくとも一部にわたって設けられているものである。 The tillage claw according to claim 3 is the tillage claw according to claim 1 or 2, in which the surface hard portion is provided over the entire surface of the thin plate portion and at least a part of the surface of the thick plate portion, and the back surface hard portion is provided. It is provided over the entire back surface of the thin plate portion and at least a part of the back surface of the thick plate portion.

請求項４記載の耕耘爪は、請求項１ないし３のいずれか一記載の耕耘爪において、薄板部分の厚さ寸法は、０．５ｍｍよりも大きく６ｍｍ以下であるものである。 The tillage claw according to claim 4 is the tillage claw according to any one of claims 1 to 3, wherein the thickness dimension of the thin plate portion is larger than 0.5 mm and 6 mm or less.

請求項５記載の耕耘爪は、請求項１ないし４のいずれか一記載の耕耘爪において、爪本体部は、断面Ｔ字状又は断面逆Ｌ字状に形成されているものである。 The cultivated claw according to claim 5 is the cultivated claw according to any one of claims 1 to 4, wherein the claw body portion is formed in a T-shaped cross section or an inverted L-shaped cross section.

請求項６記載の耕耘爪は、請求項１ないし５のいずれか一記載の耕耘爪において、硬質部は、薄板部分の刃縁側の端面に設けられた端面硬質部分を有するものである。 The tillage claw according to claim 6 is the tillage claw according to any one of claims 1 to 5, wherein the hard portion has an end face hard portion provided on the end surface of the thin plate portion on the blade edge side.

本発明によれば、耐久性の向上を図ることができる。 According to the present invention, durability can be improved.

本発明の一実施の形態に係る耕耘爪を備えた農作業機の側面図である。It is a side view of the agricultural work machine provided with the tilling claw which concerns on one Embodiment of this invention. 同上耕耘爪の側面図である。It is the side view of the tilling claw of the same as above. 同上耕耘爪の平面図である。It is a plan view of the tilling claw of the same as above. 図３のＩＶ−ＩＶ断面図である。FIG. 3 is a sectional view taken along line IV-IV of FIG. 本発明の他の実施の形態に係る耕耘爪の断面図である。It is sectional drawing of the tilling claw which concerns on other embodiment of this invention. 本発明のさらに他の実施の形態に係る耕耘爪の断面図である。It is sectional drawing of the tilling claw which concerns on still another Embodiment of this invention.

本発明の一実施の形態について図１ないし図４を参照して説明する。 An embodiment of the present invention will be described with reference to FIGS. 1 to 4.

図１において、１は農作業機で、この農作業機１は、例えば走行車であるトラクタ（図示せず）の後部に連結され、当該トラクタの走行により圃場を進行方向である前方に移動しながら耕耘整地作業（農作業）をするロータリー耕耘機である。 In FIG. 1, reference numeral 1 denotes an agricultural work machine, which is connected to, for example, the rear part of a tractor (not shown) which is a traveling vehicle, and is cultivated while moving the field forward in the traveling direction by the traveling of the tractor. It is a rotary cultivator that performs land preparation work (agricultural work).

農作業機１は、図１に示すように、トラクタの後部の３点リンクに脱着可能に連結される機体２と、この機体２に回転可能に設けられ、水平な左右方向の回転中心軸線Ｘを中心として所定方向（例えばダウンカット方向の回転方向）に回転しながら耕耘作業をする耕耘体（ロータリー）３と、機体２に上下方向に回動可能に設けられ、耕耘体３の後方で整地作業する整地体（均平板）４とを備えている。 As shown in FIG. 1, the agricultural work machine 1 has a body 2 detachably connected to a three-point link at the rear of the tractor, and a rotation center axis X rotatably provided on the body 2 in the horizontal left-right direction. A cultivator (rotary) 3 that performs cultivating work while rotating in a predetermined direction (for example, a rotation direction in the downcut direction) as a center, and a cultivator body 2 that is rotatably provided in the vertical direction and prepares the ground behind the cultivated body 3. It is provided with a ground leveling body (leveling flat plate) 4.

機体２は、図示しないトラクタの後部の３点リンクに脱着可能に連結される３点連結部（走行車連結部）11を有している。３点連結部11は、１本のトップマスト12及び左右１対で２本のロワーアーム13等によって構成されている。 The aircraft 2 has a three-point connecting portion (traveling vehicle connecting portion) 11 that is detachably connected to a three-point link at the rear of the tractor (not shown). The three-point connecting portion 11 is composed of one top mast 12 and two lower arms 13 and the like in a pair on the left and right.

また、機体２は、トラクタのＰＴＯ軸にジョイントを介して接続される入力軸16を回転可能に保持する軸保持部であるミッションケース部17を有している。このミッションケース部17の左右両側には、左右方向に延びるフレーム部であるフレームパイプ部18の内端部が取り付けられている。 Further, the airframe 2 has a mission case portion 17 which is a shaft holding portion for rotatably holding an input shaft 16 connected to the PTO shaft of the tractor via a joint. The inner ends of the frame pipe portion 18, which is a frame portion extending in the left-right direction, are attached to both the left and right sides of the mission case portion 17.

さらに、左側のフレームパイプ部18の外端部には、一方側の耕耘体支持部であるチェーンケース部19が取り付けられ、また、右側のフレームパイプ部18の外端部には、他方側の耕耘体支持部であるブラケット部（図示せず）が取り付けられている。そして、これら互いに離間対向するチェーンケース部19及びブラケット部間には、耕耘体３が回転中心軸線Ｘを中心として回転可能に架設されている。なお、チェーンケース部19及びブラケット部には、側板部であるサイドカバー板20が固設されている。 Further, a chain case portion 19 which is a tiller support portion on one side is attached to the outer end portion of the frame pipe portion 18 on the left side, and a chain case portion 19 on the other side is attached to the outer end portion of the frame pipe portion 18 on the right side. A bracket part (not shown), which is a cultivated body support part, is attached. A tiller body 3 is rotatably installed around the rotation center axis X between the chain case portion 19 and the bracket portion that are separated from each other and face each other. A side cover plate 20, which is a side plate portion, is firmly attached to the chain case portion 19 and the bracket portion.

また、機体２は、耕耘体３の上方部を覆う耕耘カバー部21を有し、この耕耘カバー部21の後端部には、整地体４が左右方向の軸22を中心として上下方向に回動可能に設けられている。なお、整地体４と機体２との間には、圃場面に対する整地体４の接地圧を調整する接地圧調整手段23が架設されている。また、機体２の前部には、ゲージ輪24が設けられている。 Further, the machine body 2 has a tillage cover portion 21 that covers the upper portion of the tillage body 3, and at the rear end portion of the tillage cover portion 21, the ground leveling body 4 rotates in the vertical direction about the axis 22 in the left-right direction. It is provided so that it can be moved. A ground pressure adjusting means 23 for adjusting the ground pressure of the ground leveling body 4 with respect to the field scene is installed between the ground leveling body 4 and the machine body 2. Further, a gauge wheel 24 is provided on the front portion of the machine body 2.

耕耘体３は、図１に示すように、入力軸16側からの動力（回転動力）に基づいて回転する水平な左右方向の回転軸である耕耘軸31を有している。この耕耘軸31は、左右方向に細長い丸軸状の軸本体部32と、この軸本体部32の外周面に突設された複数の爪取付部であるフランジ部33を有している。 As shown in FIG. 1, the cultivated body 3 has a cultivated shaft 31 which is a horizontal rotation axis in the left-right direction that rotates based on a power (rotational power) from the input shaft 16 side. The tilling shaft 31 has a round shaft body portion 32 elongated in the left-right direction and a flange portion 33 which is a plurality of claw mounting portions projecting from the outer peripheral surface of the shaft body portion 32.

そして、耕耘軸31の各フランジ部33には、耕耘軸31とともに回転中心軸線Ｘを中心として所定の回転方向に回転しながら耕耘作業をする複数の耕耘爪35が取付手段（例えばボルト、ナット等）によって脱着可能に取り付けられている。 Then, on each flange portion 33 of the tilling shaft 31, a plurality of tilling claws 35 that perform tilling work while rotating in a predetermined rotation direction around the rotation center axis X together with the tilling shaft 31 are attached means (for example, bolts, nuts, etc.). ) Is detachably attached.

ここで、耕耘体３の耕耘爪35について詳細に説明する。 Here, the tilling claw 35 of the tilling body 3 will be described in detail.

耕耘爪35は、図２ないし図４に示すように、回転中心Ｐ（回転中心軸線Ｘ）を中心として所定の回転方向（図中の矢印方向）に回転しながら耕耘作業をする湾曲板状の爪本体部41と、この爪本体部41のうち少なくとも表面及び裏面に溶着等により設けられ、当該爪本体部41よりも硬質で耐摩耗性に優れた肉盛状の摩耗抑制部である硬質部（硬質金属部）42とを備えている。 As shown in FIGS. 2 to 4, the tilling claw 35 has a curved plate shape that performs tilling work while rotating in a predetermined rotation direction (arrow direction in the drawing) about the rotation center P (rotation center axis X). A hard portion that is a built-up wear suppressing portion that is provided on at least the front surface and the back surface of the claw main body 41 and at least the front surface and the back surface of the claw main body 41 by welding or the like, and is harder than the claw main body 41 and has excellent wear resistance. (Hard metal part) 42 is provided.

爪本体部（母材）41は、所定の金属材料（例えばＳＵＰ６等のばね鋼鋼材）からなるものである。他方、硬質部（溶着金属）42は、爪本体部41を構成する所定の金属材料よりも硬質な金属材料（例えば鋼材にカーバイト、タングステン、クロム、ニッケル等を混合した金属材料等）からなるものである。 The claw body portion (base material) 41 is made of a predetermined metal material (for example, a spring steel material such as SUP6). On the other hand, the hard portion (welded metal) 42 is made of a metal material harder than a predetermined metal material constituting the nail body portion 41 (for example, a metal material in which carbide, tungsten, chromium, nickel, etc. are mixed with a steel material). It is a thing.

そして、例えば溶着によって硬質部42を爪本体部41に設ける場合においては、硬質部42を構成することとなる硬質な金属材料の粉末を曲げ加工前の平板状の爪本体部41上に所定の厚さで載置した後、当該粉末を熱で溶かして溶着する方法を利用する。なお、例えば溶射、プラズマ粉末溶接、レーザ粉末溶接等によって硬質部42を設けるようにしてもよい。 Then, for example, when the hard portion 42 is provided on the nail main body 41 by welding, a powder of a hard metal material forming the hard portion 42 is formed on a flat plate-shaped nail main body 41 before bending. After placing the powder to a thickness, a method of melting the powder with heat and welding is used. The hard portion 42 may be provided by, for example, thermal spraying, plasma powder welding, laser powder welding, or the like.

爪本体部41は、回転方向に対して交差する方向に長手方向を有する湾曲板状のもので、例えば長手方向一端側である基端側（耕耘体３の回転中心Ｐ側）から長手方向他端側である先端側（耕耘体３の外周側）に向かって順に連続して位置する３つの部分、すなわち取付基部46、縦刃部47及び横刃部48によって構成されている。 The claw body 41 has a curved plate shape having a longitudinal direction in a direction intersecting the rotation direction, for example, from the base end side (rotation center P side of the tiller 3) which is one end side in the longitudinal direction to the longitudinal direction and the like. It is composed of three portions, that is, a mounting base portion 46, a vertical blade portion 47, and a horizontal blade portion 48, which are continuously located in order toward the tip side (the outer peripheral side of the tiller 3) which is the end side.

換言すると、爪本体部41は、耕耘軸31のフランジ部33に脱着可能に取り付けられる取付基部46と、この取付基部41の先端側の端部に連設された縦刃部47と、この縦刃部47の先端側の端部に連設された横刃部48とを有している。 In other words, the claw body 41 includes a mounting base 46 that is detachably attached to the flange 33 of the tilling shaft 31, a vertical blade 47 that is continuously provided at the tip end of the mounting base 41, and this vertical blade. It has a horizontal blade portion 48 connected to the end portion of the blade portion 47 on the tip end side.

そして、爪本体部41は、縦刃部47から横刃部48にかけて反回転方向側（回転方向とは反対側）に湾曲し、かつ、横刃部48が立ち上げ線Ｌを基端として一方側である表面側（図２において図面手前側）に徐々に立ち上がるように湾曲している。なお、横刃部48が表面側への湾曲を開始する湾曲開始線である立ち上げ線Ｌは、縦刃部47と横刃部48との境界線である。 The claw body 41 is curved from the vertical blade 47 to the horizontal blade 48 in the counter-rotation direction (opposite the rotation direction), and the horizontal blade 48 is on one side with the rise line L as the base end. It is curved so as to gradually rise toward the surface side (the front side in the drawing in FIG. 2), which is the side. The rising line L, which is the starting line for bending the horizontal blade portion 48 toward the surface side, is the boundary line between the vertical blade portion 47 and the horizontal blade portion 48.

また一方、爪本体部41は、回転方向側である刃縁側（回転方向前側）に位置する薄肉状の薄板部分51と、反回転方向側である峰縁側（回転方向後側）に位置し、薄板部分51よりも厚く形成された厚肉状の厚板部分52とを有している。 On the other hand, the claw body 41 is located on the thin-walled thin plate portion 51 located on the blade edge side (front side in the rotation direction) on the rotation direction side and on the peak edge side (rear side in the rotation direction) on the opposite rotation direction side. It has a thick-walled thick plate portion 52 formed thicker than the thin plate portion 51.

つまり、爪本体部41は、縦刃部47から横刃部48にわたって位置する長手状で断面Ｔ字状のＴ字状部50を有し、このＴ字状部50が刃縁側の薄板部分51と峰縁側の厚板部分52とで構成されている。なお、図示した例では、爪本体部41のＴ字状部50は、縦刃部47の中間位置から横刃部48の先端位置までにわたって形成された構成であるが、この構成には限定されず、例えば縦刃部47の基端位置から横刃部48の先端位置までにわたって形成された構成でもよく、また縦刃部47及び横刃部48のいずれか一方の全部又は一部のみに形成された構成等でもよい。 That is, the claw body portion 41 has a T-shaped portion 50 having a longitudinal shape and a T-shaped cross section located from the vertical blade portion 47 to the horizontal blade portion 48, and the T-shaped portion 50 is a thin plate portion 51 on the blade edge side. It is composed of a plate portion 52 on the ridge side and a plate portion 52. In the illustrated example, the T-shaped portion 50 of the claw body portion 41 has a configuration formed from the intermediate position of the vertical blade portion 47 to the tip position of the horizontal blade portion 48, but is limited to this configuration. For example, it may be formed from the base end position of the vertical blade portion 47 to the tip position of the horizontal blade portion 48, or may be formed only in all or a part of either the vertical blade portion 47 or the horizontal blade portion 48. The configuration may be the same.

そして、図４に示す如く、薄板部分51は、互いに平行状（略平行状を含む）に形成された表面56及び裏面57と、これら表裏面56，57に対して直交する刃縁側の端面58とを有している。つまり、爪の母材の刃縁側が峰側よりも薄く加工されることで爪本体部41には薄板部分51が形成され、この薄板部分51は、表裏相互に平行で平坦な部分（平行な表裏面56，57）を持ったものであって、傾斜状の刃付面を有していない（刃付けなし）。なお、表面56は横刃部48が立ち上げ線Ｌを基端として立ち上がるように湾曲した側である表面側の面であり、他方、裏面57は当該湾曲した側とは反対側の面である（後述する厚板部分等でも同様である）。 Then, as shown in FIG. 4, the thin plate portion 51 has a front surface 56 and a back surface 57 formed in parallel with each other (including substantially parallel shapes) and an end surface 58 on the blade edge side orthogonal to the front and back surfaces 56 and 57. And have. That is, since the blade edge side of the base material of the nail is processed thinner than the peak side, a thin plate portion 51 is formed on the nail body portion 41, and the thin plate portion 51 is a flat portion (parallel) parallel to the front and back surfaces. It has front and back surfaces 56, 57) and does not have an inclined bladed surface (without bladed surface). The front surface 56 is a surface on the front surface side where the horizontal blade portion 48 is curved so as to rise from the rising line L as a base end, while the back surface 57 is a surface on the opposite side to the curved side. (The same applies to the thick plate portion described later).

また、厚板部分52は、厚さが一定である第１厚板部分（厚さ一定部）61と、厚さが変化する第２厚板部分（厚さ変化部）62とで構成されている。第１厚板部分61は、互いに平行状（略平行状を含む）に形成された表面63及び裏面64と、これら表裏面63，64に対して直交する峰縁側の端面65とを有している。第２厚板部分62は、当該第２厚板部分62の厚さ寸法が薄板部分51側に向かって徐々に減少するようにそれぞれが傾斜状に形成された表面66及び裏面67を有している。そして、第２厚板部分（段差形成部）62によって薄板部分51と第１厚板部分61とが一体に連結され、両表面56，63間及び両裏面57，64間にそれぞれ段差が形成されている。なお、例えば薄板部分51と第１厚板部分61との間に第２厚板部分62が存在しない構成等でもよい。 Further, the thick plate portion 52 is composed of a first thick plate portion (constant thickness portion) 61 having a constant thickness and a second thick plate portion (thickness changing portion) 62 having a changing thickness. There is. The first plank portion 61 has a front surface 63 and a back surface 64 formed parallel to each other (including substantially parallel shapes), and an end surface 65 on the ridge side orthogonal to the front and back surfaces 63 and 64. There is. The second thick plate portion 62 has a front surface 66 and a back surface 67, each of which is formed in an inclined shape so that the thickness dimension of the second thick plate portion 62 gradually decreases toward the thin plate portion 51 side. There is. Then, the thin plate portion 51 and the first thick plate portion 61 are integrally connected by the second thick plate portion (step forming portion) 62, and a step is formed between both front surfaces 56 and 63 and both back surfaces 57 and 64, respectively. ing. In addition, for example, a configuration in which the second thick plate portion 62 does not exist between the thin plate portion 51 and the first thick plate portion 61 may be used.

ここで、厚さが一定である薄板部分51の厚さ寸法（図４中のＡ）は、例えば０．５ｍｍよりも大きく６ｍｍ以下で、好ましくは例えば３ｍｍである。厚さが一定である第１厚板部分61の厚さ寸法（図４中のＢ）は、例えば６ｍｍよりも大きく１２ｍｍ以下で、好ましくは例えば６ｍｍである。第１厚板部分61の表面63に対する表面硬質部分71の突出寸法（図４中のＣ）は、例えば１ｍｍよりも大きく５ｍｍ以下で、好ましくは例えば３ｍｍである。第１厚板部分61の裏面64に対する裏面硬質部分72の突出寸法（図４中のＤ）は、例えば１ｍｍよりも大きく５ｍｍ以下で、好ましくは例えば３ｍｍである。なお、図示した例では、突出寸法のＣとＤは等しいが、互いに異なるようにしてもよい。 Here, the thickness dimension (A in FIG. 4) of the thin plate portion 51 having a constant thickness is, for example, larger than 0.5 mm and 6 mm or less, preferably 3 mm, for example. The thickness dimension (B in FIG. 4) of the first thick plate portion 61 having a constant thickness is, for example, larger than 6 mm and 12 mm or less, preferably 6 mm, for example. The protruding dimension (C in FIG. 4) of the surface hard portion 71 with respect to the surface 63 of the first thick plate portion 61 is, for example, larger than 1 mm and 5 mm or less, preferably 3 mm, for example. The protruding dimension (D in FIG. 4) of the back surface hard portion 72 with respect to the back surface 64 of the first thick plate portion 61 is, for example, larger than 1 mm and 5 mm or less, preferably 3 mm, for example. In the illustrated example, the protruding dimensions C and D are the same, but they may be different from each other.

硬質部42は、爪本体部41の薄板部分51の表面の全部（略全部を含む）及び厚板部分52の表面の少なくとも一部にわたって設けられて当該部分を覆う表面硬質部分71と、爪本体部41の薄板部分51の裏面の全部（略全部を含む）及び厚板部分52の裏面の少なくとも一部にわたって設けられて当該部分を覆う裏面硬質部分72とを有している。 The hard portion 42 includes a surface hard portion 71 provided over at least a part of the surface of the thin plate portion 51 of the nail body portion 41 (including substantially the entire surface) and the surface of the thick plate portion 52 to cover the portion, and the nail body. It has a back surface hard portion 72 provided over at least a part of the back surface of the thin plate portion 51 of the portion 41 (including substantially all) and the back surface of the thick plate portion 52 and covering the portion.

表面硬質部分71は、第１厚板部分61の表面63にまで延在したものであって、薄板部分51の表面56の全部と、第２厚板部分62の表面66の全部と、第１厚板部分61の表面63の一部（傾斜状の表面66に隣接した表面部分63a）とにわたって連続して設けられている。それゆえ、薄板部分51の表面56と第１厚板部分61の表面63との間の段差（表面側の段差）は、表面硬質部分71の存在によって外部から認識不能である。 The surface hard portion 71 extends to the surface 63 of the first thick plate portion 61, and includes the entire surface 56 of the thin plate portion 51, the entire surface 66 of the second thick plate portion 62, and the first. It is continuously provided over a part of the surface 63 of the plank portion 61 (the surface portion 63a adjacent to the inclined surface 66). Therefore, the step (step on the surface side) between the surface 56 of the thin plate portion 51 and the surface 63 of the first thick plate portion 61 cannot be recognized from the outside due to the presence of the hard surface portion 71.

同様に、裏面硬質部分72は、第１厚板部分61の裏面64にまで延在したものであって、薄板部分51の裏面57の全部と、第２厚板部分62の裏面67の全部と、第１厚板部分61の裏面64の一部（傾斜状の裏面67に隣接した表面部分64a）とにわたって連続して設けられている。それゆえ、薄板部分51の裏面57と第１厚板部分61の裏面64との間の段差（裏面側の段差）は、裏面硬質部分72の存在によって外部から認識不能である。 Similarly, the back surface hard portion 72 extends to the back surface 64 of the first thick plate portion 61, and includes the entire back surface 57 of the thin plate portion 51 and the entire back surface 67 of the second thick plate portion 62. , Is continuously provided over a part of the back surface 64 of the first plank portion 61 (the front surface portion 64a adjacent to the inclined back surface 67). Therefore, the step between the back surface 57 of the thin plate portion 51 and the back surface 64 of the first thick plate portion 61 (step on the back surface side) cannot be recognized from the outside due to the presence of the back surface hard portion 72.

また、表面硬質部分71は、凸状に緩やかに湾曲した湾曲表面73を有しており、この湾曲表面73の一部は第１厚板部分61の表面63よりも表面側に突出して位置する。さらに、この表面硬質部分71のうち、薄板部分51の表面56に設けられた部分、すなわち薄板部分51の表面56を覆う薄板部分被覆部74の厚さ寸法は、刃縁側に向かって徐々に減少しており、刃縁位置では略ゼロである。なお、第１厚板部分61の表面63の表面部分63aを覆う第１厚板部分被覆部75は、第２厚板部分62の表面66を覆う第２厚板部分被覆部76よりも薄く形成されている。 Further, the surface hard portion 71 has a curved surface 73 that is gently curved in a convex shape, and a part of the curved surface 73 is located so as to project toward the surface side of the surface 63 of the first thick plate portion 61. .. Further, among the surface hard portions 71, the thickness dimension of the portion provided on the surface 56 of the thin plate portion 51, that is, the thin plate portion covering portion 74 covering the surface 56 of the thin plate portion 51 gradually decreases toward the blade edge side. The blade edge position is almost zero. The first thick plate portion covering portion 75 that covers the surface portion 63a of the surface 63 of the first thick plate portion 61 is formed thinner than the second thick plate portion covering portion 76 that covers the surface 66 of the second thick plate portion 62. Has been done.

同様に、裏面硬質部分72は、凸状に緩やかに湾曲した湾曲表面83を有しており、この湾曲表面83の一部は第１厚板部分61の裏面64よりも裏面側に突出して位置する。さらに、この裏面硬質部分72のうち、薄板部分51の裏面57に設けられた部分、すなわち薄板部分51の裏面57を覆う薄板部分被覆部84の厚さ寸法は、刃縁側に向かって徐々に減少しており、刃縁位置では略ゼロである。なお、第１厚板部分61の裏面64の表面部分64aを覆う第１厚板部分被覆部85は、第２厚板部分62の裏面67を覆う第２厚板部分被覆部86よりも薄く形成されている。 Similarly, the back surface hard portion 72 has a curved surface 83 that is gently curved in a convex shape, and a part of the curved surface 83 is positioned so as to project toward the back surface side of the back surface 64 of the first plank portion 61. do. Further, of the back surface hard portion 72, the thickness dimension of the portion provided on the back surface 57 of the thin plate portion 51, that is, the thin plate portion covering portion 84 covering the back surface 57 of the thin plate portion 51 gradually decreases toward the blade edge side. The blade edge position is almost zero. The first thick plate portion covering portion 85 that covers the front surface portion 64a of the back surface 64 of the first thick plate portion 61 is formed thinner than the second thick plate portion covering portion 86 that covers the back surface 67 of the second thick plate portion 62. Has been done.

また一方、図２に示されるように、爪本体部41の取付基部46には、複数、例えば２つのボルト用孔90が表裏面に貫通して形成されている。同様に、耕耘軸31のフランジ部33にもボルト用孔が表裏面に貫通して形成されており、これら両ボルト用孔にボルトが挿入されてそのボルトにナットが螺合されることで、耕耘爪35が耕耘軸31のフランジ部33に取り付けられる。なお、図２及び図３において、ハッチング部は硬質部（溶着加工部）42である。 On the other hand, as shown in FIG. 2, the mounting base 46 of the claw body 41 is formed with a plurality of, for example, two bolt holes 90 penetrating the front and back surfaces. Similarly, bolt holes are formed through the front and back surfaces of the flange portion 33 of the tillage shaft 31, and bolts are inserted into the holes for both bolts and nuts are screwed into the bolts. The tillage claw 35 is attached to the flange portion 33 of the tillage shaft 31. In addition, in FIG. 2 and FIG. 3, the hatching portion is a hard portion (welding processed portion) 42.

次に、農作業機１の作用等を説明する。 Next, the operation and the like of the agricultural work machine 1 will be described.

農作業機１をトラクタの後部に連結し、このトラクタの走行により農作業機１を前方に移動させると、耕耘体３の耕耘爪35が耕耘軸31とともに回転しながら耕耘作業をし、その後方で整地体４が整地作業をする。 When the agricultural work machine 1 is connected to the rear part of the tractor and the agricultural work machine 1 is moved forward by the running of the tractor, the tillage claw 35 of the tiller body 3 performs the tillage work while rotating with the tiller shaft 31, and the ground is leveled behind it. Body 4 performs ground leveling work.

そして、この農作業機１の耕耘爪35によれば、爪本体部41よりも硬質な硬質部42は、薄板部分51の表面から厚板部分52の表面にわたって設けられた表面硬質部分71と、薄板部分51の裏面から厚板部分52の裏面にわたって設けられた裏面硬質部分72とを有することから、例えば両硬質部分71，72で挟まれた薄板部分51は摩耗しにくく残るため、両硬質部分71，72が従来に比べて欠けにくくなり、よって、耐久性の向上を図ることができる。 Then, according to the tilling claw 35 of the agricultural work machine 1, the hard portion 42, which is harder than the claw main body portion 41, has a surface hard portion 71 provided from the surface of the thin plate portion 51 to the surface of the thick plate portion 52 and the thin plate. Since it has a back surface hard portion 72 provided from the back surface of the portion 51 to the back surface of the thick plate portion 52, for example, the thin plate portion 51 sandwiched between the two hard portions 71 and 72 remains hard to wear, so that both hard portions 71 ， 72 is less likely to be chipped than before, and therefore durability can be improved.

しかも、爪本体部41における薄板部分51と厚板部分52との段差は、表面硬質部分71及び裏面硬質部分72からなる硬質部42の存在によって外部から認識不能となっているため、耐久性の向上をより適切に図ることができる。 Moreover, the step between the thin plate portion 51 and the thick plate portion 52 in the claw body portion 41 cannot be recognized from the outside due to the presence of the hard portion 42 composed of the front surface hard portion 71 and the back surface hard portion 72, so that the durability is high. Improvement can be achieved more appropriately.

なお、耕耘爪35は、爪本体部41の所定部分が断面Ｔ字状に形成された構成には限定されず、例えば図５に示すように、断面Ｔ字状のＴ字状部50に代えて断面逆Ｌ字状の逆Ｌ字状部100を形成した構成でもよい。 The tilling claw 35 is not limited to a configuration in which a predetermined portion of the claw body portion 41 is formed in a T-shaped cross section, and is replaced with a T-shaped portion 50 having a T-shaped cross section, for example, as shown in FIG. The inverted L-shaped portion 100 having an inverted L-shaped cross section may be formed.

この図５に示す耕耘爪35の爪本体部41は、縦刃部47から横刃部48にわたって位置する長手状で断面逆Ｌ字状の逆Ｌ字状部100を有し、この逆Ｌ字状部100が刃縁側の薄板部分51と峰縁側の厚板部分52とで構成されている。そして、この逆Ｌ字状100の厚板部分52において、第２厚板部分62は、当該第２厚板部分62の厚さ寸法が薄板部分51側に向かって徐々に減少するように、表面66のみが傾斜状に形成されている。この第２厚板部分62の裏面67は、他の部分の裏面57，64と同一面上に位置しており、裏面側には段差が形成されていない。 The claw body portion 41 of the tilling claw 35 shown in FIG. 5 has an inverted L-shaped portion 100 having a longitudinal shape and an inverted L-shaped cross section located from the vertical blade portion 47 to the horizontal blade portion 48, and the inverted L-shape. The shape portion 100 is composed of a thin plate portion 51 on the blade edge side and a thick plate portion 52 on the peak edge side. Then, in the thick plate portion 52 of the inverted L-shaped 100, the surface of the second thick plate portion 62 is such that the thickness dimension of the second thick plate portion 62 gradually decreases toward the thin plate portion 51 side. Only 66 are formed in a slanted shape. The back surface 67 of the second thick plate portion 62 is located on the same surface as the back surfaces 57 and 64 of the other portions, and no step is formed on the back surface side.

また、図５に示す硬質部42の表面硬質部分71は、薄板部分51の表面56の全部と、第２厚板部分62の表面66の全部と、第１厚板部分61の表面63の一部（傾斜状の表面66に隣接した表面部分63a）とにわたって連続して設けられており、薄板部分51の表面56と第１厚板部分61の表面63との間の比較的大きな段差が当該表面硬質部分71の存在によって外部から認識不能となっている。 Further, the surface hard portion 71 of the hard portion 42 shown in FIG. 5 is one of the entire surface 56 of the thin plate portion 51, the entire surface 66 of the second thick plate portion 62, and the surface 63 of the first thick plate portion 61. It is continuously provided over the portion (surface portion 63a adjacent to the inclined surface 66), and a relatively large step between the surface 56 of the thin plate portion 51 and the surface 63 of the first thick plate portion 61 is concerned. The presence of the hard surface portion 71 makes it unrecognizable from the outside.

さらに、図５に示す硬質部42の裏面硬質部分72は、薄板部分51の裏面57の全部と、第２厚板部分62の裏面67の全部と、第１厚板部分61の裏面64の一部（非傾斜状の裏面67に隣接した表面部分64a）とにわたって連続して設けられているが、この裏面硬質部分72は、表面硬質部分71とは異なり、段差を埋めるものではなく、爪本体部41が有する平坦な裏面に肉盛状（膨出状）に設けられている。なお、段差を埋めた表面硬質部分71は、裏面硬質部分72に比べて厚く形成されている。 Further, the back surface hard portion 72 of the hard portion 42 shown in FIG. 5 is one of the entire back surface 57 of the thin plate portion 51, the entire back surface 67 of the second thick plate portion 62, and the back surface 64 of the first thick plate portion 61. It is continuously provided over the portion (the surface portion 64a adjacent to the non-inclined back surface 67), but unlike the front surface hard portion 71, the back surface hard portion 72 does not fill the step and is not a claw body. It is provided in a built-up shape (bulging shape) on the flat back surface of the portion 41. The front surface hard portion 71 that fills the step is formed thicker than the back surface hard portion 72.

そして、このような図５に示す耕耘爪35でも、図４に示すものと同様、耐久性の向上を図ることができ、特に表面硬質部分71が裏面硬質部分72に比べて厚く形成されているため、耕耘爪35の表面側の耐久性がより一層良好である。なお、耕耘爪35の表面側が摩耗しやすい場合には上記図５に示す構成が好ましいが、例えば耕耘爪35の裏面側が摩耗しやすい場合には、表裏逆の構成として薄板部分51の裏面57と第１厚板部分61の裏面64との間の比較的大きな段差を裏面硬質部分72の存在で外部から認識できないようにしてもよい。 Further, even in such a tilling claw 35 shown in FIG. 5, durability can be improved as in the case shown in FIG. 4, and in particular, the front surface hard portion 71 is formed thicker than the back surface hard portion 72. Therefore, the durability of the surface side of the tillage claw 35 is even better. When the front surface side of the tillage claw 35 is easily worn, the configuration shown in FIG. 5 is preferable. For example, when the back surface side of the tillage claw 35 is easily worn, the back surface 57 of the thin plate portion 51 is used as an inverted configuration. The relatively large step between the back surface 64 of the first thick plate portion 61 may not be recognized from the outside due to the presence of the back surface hard portion 72.

また、図４や図５に示す耕耘爪35では、爪本体部41の薄板部分51の刃縁側の端面58には硬質部42が設けられていないが、より一層の耐久性向上のために、当該薄板部分51の刃縁側の端面58にも硬質部（耐摩耗性金属層）42を溶着等により設けてもよい。 Further, in the tillage claw 35 shown in FIGS. 4 and 5, the hard portion 42 is not provided on the end face 58 on the blade edge side of the thin plate portion 51 of the claw body portion 41, but in order to further improve the durability, A hard portion (wear-resistant metal layer) 42 may also be provided on the end face 58 on the blade edge side of the thin plate portion 51 by welding or the like.

すなわち、例えば図６に示す耕耘爪35の硬質部42は、爪本体部41の薄板部分51の刃縁側の端面58に設けられた端面硬質部分101を有している。この図６に示す例では、例えば溶着金属が刃縁側の端面（母材板厚部）58にも施工されることにより、爪本体部41の薄板部分51の全体が硬質部42によって覆い隠されているため、耐久性がより一層良好である。 That is, for example, the hard portion 42 of the tillage claw 35 shown in FIG. 6 has an end face hard portion 101 provided on the end face 58 on the blade edge side of the thin plate portion 51 of the claw body portion 41. In the example shown in FIG. 6, for example, the weld metal is also applied to the end surface (thick portion of the base material plate) 58 on the blade edge side, so that the entire thin plate portion 51 of the claw body portion 41 is covered by the hard portion 42. Therefore, the durability is even better.

なお、上記各実施形態において、例えば耕耘爪35の外面全体に塗装層を設けてもよく、その場合に、例えば爪本体部41と硬質部42とで色が異なるように２色の塗装層を設けるようにしてもよい。 In each of the above embodiments, for example, a coating layer may be provided on the entire outer surface of the tilling claw 35, and in that case, for example, two color coating layers are provided so that the claw body portion 41 and the hard portion 42 have different colors. It may be provided.

また、上記各実施形態に係る耕耘爪35は、耕耘作業を伴う農作業を行う各種の農作業機に用いることが可能である。 Further, the tillage claw 35 according to each of the above embodiments can be used for various agricultural work machines that perform agricultural work involving tillage work.

本発明のいくつかの実施形態及びその変形例について説明したが、本発明の要旨を逸脱しない範囲で、各実施形態及び各変形例を適宜組み合わせることも可能である。 Although some embodiments of the present invention and variations thereof have been described, it is also possible to appropriately combine the embodiments and the modifications as long as the gist of the present invention is not deviated.

１農作業機
31 回転軸である耕耘軸
35 耕耘爪
41 爪本体部
42 硬質部
51 薄板部分
52 厚板部分
71 表面硬質部分
72 裏面硬質部分
101 端面硬質部分 1 Agricultural work machine
31 Tillage axis, which is a rotating axis
35 Tillage claws
41 Nail body
42 Hard part
51 Thin plate part
52 plank part
71 Hard surface
72 Back hard part
101 Hard end face

Claims

A tillage claw that is attached to the rotating shaft of an agricultural work machine.
With the nail body
It is provided on the front surface and the back surface of the nail body portion, and is provided with a hard portion that is harder than the nail body portion.
The nail body is
A thin plate portion located on the edge side of the blade and having front and back surfaces parallel to each other,
It is located on the ridge side and has a thick plate portion that is thicker than the thin plate portion.
The hard part is
A hard surface portion provided from the surface of the thin plate portion to the surface of the thick plate portion, and
A tillage claw having a back surface hard portion provided from the back surface of the thin plate portion to the back surface of the thick plate portion.

The cultivated claw according to claim 1, wherein the step between the thin plate portion and the thick plate portion in the claw body portion cannot be recognized from the outside due to the presence of the hard portion.

The surface hard portion is provided over the entire surface of the thin plate portion and at least a part of the surface of the thick plate portion.
The tillage claw according to claim 1 or 2, wherein the back surface hard portion is provided over the entire back surface of the thin plate portion and at least a part of the back surface of the thick plate portion.

The tillage claw according to any one of claims 1 to 3, wherein the thickness dimension of the thin plate portion is larger than 0.5 mm and 6 mm or less.

The cultivated claw according to any one of claims 1 to 4, wherein the claw body portion is formed in a T-shaped cross section or an inverted L-shaped cross section.

The tillage claw according to any one of claims 1 to 5, wherein the hard portion has an end face hard portion provided on the end surface of the thin plate portion on the blade edge side.