JP2007332985A

JP2007332985A - Member connecting structural

Info

Publication number: JP2007332985A
Application number: JP2006162121A
Authority: JP
Inventors: Masao Iwata; 雅夫岩田; Masayuki Nishide; 政幸西出; Hirotake Tsuchido; 裕健土堂
Original assignee: Oppama Industry Co Ltd
Current assignee: Oppama Industry Co Ltd
Priority date: 2006-06-12
Filing date: 2006-06-12
Publication date: 2007-12-27

Abstract

PROBLEM TO BE SOLVED: To provide member connecting structure which engages a first member having specified structure with a second member having specified structure of the cover, etc., at an constantly exact angle position. SOLUTION: The first member 10 has a plurality of outward pawls 27 at circumferential intervals in the outer peripheral surface of a cylinder 26. The second member 11 has a plurality of inward pawls 30 at circumferential intervals in the inner peripheral surface of a setting hole 32. The arrangement pattern of a plurality of the outward pawls 27 and the arrangement pattern of a plurality of the inward pawls 30 are a combination to permit the engagement of the first member 10 with the second member 11 with each other only at the predetermined single engaging angle position with the axis line X as a center. COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、部材結合構造に関し、詳しくは、円筒部の外周面上に周方向の間隔をおいて複数の外向き爪を有する第一部材と、取付孔の内周面に周方向の間隔をおいて複数の内向き爪を有する第二部材と、を備え、前記第一部材と前記第二部材の軸線を一致させ、且つ、前記外向き爪と前記内向き爪とが周方向に交互に並ぶようにして、前記第一部材と前記第二部材を前記軸線方向に互いに嵌合させた後に、前記外向き爪と前記内向き爪とが前記軸線方向に重なり合う所定の固定角度位置まで前記軸線を中心として相対回動させて前記第一部材と前記第二部材とが互いに結合せしめられる部材結合構造に関する。 The present invention relates to a member coupling structure, and more specifically, a first member having a plurality of outward claws on an outer peripheral surface of a cylindrical portion and a circumferential interval on an inner peripheral surface of a mounting hole. A second member having a plurality of inward claws, wherein the axes of the first member and the second member coincide with each other, and the outward claws and the inward claws are alternately arranged in the circumferential direction. After the first member and the second member are fitted to each other in the axial direction so that they are aligned, the axial line reaches a predetermined fixed angular position where the outward claws and the inward claws overlap in the axial direction. The first member and the second member are coupled to each other by rotating relative to each other.

前記の如き部材結合構造が適用可能な構造体の一例として、刈払機（図１参照）のヘッド部（図２参照）を挙げることができる（特許文献１参照）。 As an example of a structure to which the above-described member coupling structure can be applied, a head portion (see FIG. 2) of a brush cutter (see FIG. 1) can be cited (see Patent Document 1).

該ヘッド部Ｈ’は、前記第一部材としてのギアケース１０’と、該ギアケース１０’に結合・固定される、前記第二部材としてのカバー１１’と、を備えている。該カバー１１’は、前記ギアケース１０’から突出した回転駆動軸１３’に固着される刈刃４’と前記ギアケース１０’との間に、刈草や、捨てられたビニールシート等が絡み付いてしまうことを防止するためのものである。 The head portion H ′ includes a gear case 10 ′ as the first member and a cover 11 ′ as the second member that is coupled and fixed to the gear case 10 ′. The cover 11 'has mowing grass, a discarded vinyl sheet or the like entangled between the cutting blade 4' fixed to the rotary drive shaft 13 'protruding from the gear case 10' and the gear case 10 '. It is for preventing it.

前記ギアケース１０’に対する前記カバー１１’の取付構造として、次の構成のものが公知となっている。但し、具体的な特許文献については出願人は不知である。 As a structure for attaching the cover 11 'to the gear case 10', the following structure is known. However, the applicant is ignorant about specific patent documents.

図１２及び図１３に示すように、前記ギアケース１０’は、段部２５’を介して、前記回転駆動軸１３’を同心に収容する円筒部２６’を備えている。該円筒部２６’の回りには、相互間に角度間隔をおいて、複数（図１６の例では三つ）の外向き爪２７’が形成されている。該外向き爪２７’と前記段部２５’との間には、後述する内向き爪３０’が前記円筒部２６’の周方向にスライドしながら実質的に隙間なく入り込めるだけの内向き爪受入間隙２９’が設けられている。また、前記ギアケース１０’には、正取付面３６’と、その裏面３７’と、前記正取付面３６’から前記裏面３７’への貫通孔３８’と、を有するギアケース側突片３５’が形成されている。前記貫通孔３８’の内周面には、雌ねじが形成されている。 As shown in FIGS. 12 and 13, the gear case 10 ′ includes a cylindrical portion 26 ′ that accommodates the rotational drive shaft 13 ′ concentrically through a step portion 25 ′. Around the cylindrical portion 26 ', a plurality of (three in the example of FIG. 16) outward claws 27' are formed at an angular interval between each other. Between the outward claw 27 ′ and the stepped portion 25 ′, an inward claw receiving portion in which an inward claw 30 ′, which will be described later, can enter substantially without gap while sliding in the circumferential direction of the cylindrical portion 26 ′. A gap 29 'is provided. Further, the gear case 10 ′ has a gear case-side protruding piece 35 having a regular mounting surface 36 ′, a back surface 37 ′ thereof, and a through hole 38 ′ from the regular mounting surface 36 ′ to the back surface 37 ′. 'Is formed. An internal thread is formed on the inner peripheral surface of the through hole 38 '.

一方、前記カバー１１’は、図１１に示すように、その中央部に取付孔３２’を備えている。該取付孔３２’の内周面には、相互間に等角度間隔をおいて、前記外向き爪２７’と同数の複数の内向き爪３０’が形成されている。また、前記カバー１１’には、正取付面４０’と、その裏面４１’と、前記正取付面４０’から前記裏面４１’への貫通孔４２’と、を有するギアケース側突片３９’が形成されている。 On the other hand, as shown in FIG. 11, the cover 11 'has a mounting hole 32' at the center thereof. A plurality of inward claws 30 ′ equal in number to the outward claws 27 ′ are formed on the inner peripheral surface of the mounting hole 32 ′ at equal angular intervals. Further, the cover 11 ′ has a gear case-side projecting piece 39 ′ having a regular mounting surface 40 ′, a back surface 41 ′ thereof, and a through hole 42 ′ from the regular mounting surface 40 ′ to the back surface 41 ′. Is formed.

図１３に示すように、前記ギアケース１０’と前記カバー１１’は、それらの軸線Ｘ’を一致させ、且つ、前記外向き爪２７’と前記内向き爪３０’とが周方向に交互に並ぶ状態にして、互い嵌合可能である。そして、前記内向き爪３０’が前記円筒部２６’の根元の前記段部２５’に当接するまで前記ギアケース１０’と前記カバー１１’とを嵌合させた後に、前記ギアケース１０’上で前記カバー１１’を、図１６で見て反時計回り方向へと回動させることで、前記ギアケース側突片３５’と前記カバー側突片３９’の前記正取付面３６’，４０’同士を面接触させることができ、この状態で、前記貫通孔３８’，４２’同士が一直線に連通する。 As shown in FIG. 13, the gear case 10 ′ and the cover 11 ′ have their axes X ′ aligned, and the outward claws 27 ′ and the inward claws 30 ′ are alternately arranged in the circumferential direction. They can be fitted together in a lined state. Then, after fitting the gear case 10 ′ and the cover 11 ′ until the inward claw 30 ′ contacts the step portion 25 ′ at the base of the cylindrical portion 26 ′, The cover 11 ′ is rotated counterclockwise as viewed in FIG. 16, so that the positive mounting surfaces 36 ′, 40 ′ of the gear case side protruding piece 35 ′ and the cover side protruding piece 39 ′ can be obtained. They can be brought into surface contact with each other, and in this state, the through holes 38 'and 42' communicate with each other in a straight line.

そこで、図９に示すように、前記カバー側突片３９’の前記貫通孔４２’にねじ３４’を挿通し、このねじ３４’を前記ギアケース側突片３５’の前記貫通孔３８’にねじ結合させることで、前記カバー１１’を前記ギアケース１０’に対して結合・固定することができる。この結合・固定状態においては、前記内向き爪３０’が前記内向き爪受入間隙２９’に隙間なく入り込み、前記外向き爪２７’と前記内向き爪３０’とが前記円筒部２６’の軸線Ｘ’方向に互いに重なり合っているので、前記ねじが一箇所だけしかなくても、前記ギアケース１０’に対する前記カバー１１’の結合は、確実なものとなる。 Therefore, as shown in FIG. 9, a screw 34 'is inserted into the through hole 42' of the cover side protruding piece 39 ', and this screw 34' is inserted into the through hole 38 'of the gear case side protruding piece 35'. The cover 11 ′ can be coupled and fixed to the gear case 10 ′ by screw coupling. In this coupled / fixed state, the inward claw 30 ′ enters the inward claw receiving gap 29 ′ without any gap, and the outward claw 27 ′ and the inward claw 30 ′ are the axis of the cylindrical portion 26 ′. Since they overlap each other in the X ′ direction, the connection of the cover 11 ′ to the gear case 10 ′ is ensured even if there is only one screw.

ところで、前記各内向き爪３０’は、前記ギアケース１０’の前記円筒部２６’の前記外向き爪２７’同士の間のいずれの間隔にも嵌め込み可能な大きさである。同様に、前記ギアケース１０’の前記各外向き爪２７’は、前記カバー１１’の前記内向き爪３０’同士の間のいずれの間隔にも嵌め込み可能な大きさである。このため、前記ギアケース１０’と前記カバー１１’との嵌合可能角度位置は、複数（図１１，１２，１３の例では三つ）存在することになる。 By the way, each inward claw 30 'has a size that can be fitted into any gap between the outward claws 27' of the cylindrical portion 26 'of the gear case 10'. Similarly, the outward claws 27 ′ of the gear case 10 ′ are sized so as to fit into any gap between the inward claws 30 ′ of the cover 11 ′. For this reason, there are a plurality (three in the examples of FIGS. 11, 12, and 13) of angular positions where the gear case 10 ′ and the cover 11 ′ can be fitted.

仮に、前記ギアケース１０’に前記カバー１１’を嵌合させた後の、前記突片３５’，３９’同士を面接触させるための前記カバー１１’の相対回動が、図１３で見て、時計回り方向にも反時計回り方向にも自由であるとすると、メンテナンス後にユーザーが、図１０に示すように、前記ギアケース側突片３５’と前記カバー側突片３９’とを、それらの前記裏面３７’，４１’同士を近接させる誤った取付状態でねじ止めしてしまう危険がある。前記ギアケース側突片３５’と、前記カバー側突片３９’は、前記正取付面３６’，４０’同士であれば密着させることができるが、前記裏面３７’，４１’同士は、角度が異なるので、密着状態とはならない。しかし、図１０に示すように、前記裏面３７’，４１’同士を最も接近させて対面させた誤った状態でも、前記カバー側突片３９’の前記貫通孔４２’に前記ねじ３４’を挿通し、このねじ３４’を前記ギアケース側突片３５’の前記貫通孔（ねじ孔）３８’に無理やりねじ結合させることは、あり得ないことではない。 If the cover 11 ′ is fitted to the gear case 10 ′, the relative rotation of the cover 11 ′ for bringing the projecting pieces 35 ′ and 39 ′ into surface contact with each other can be seen in FIG. Assuming that both the clockwise direction and the counterclockwise direction are free, the user can place the gear case side protruding piece 35 ′ and the cover side protruding piece 39 ′ after maintenance as shown in FIG. There is a risk of screwing in the wrong mounting state in which the back surfaces 37 'and 41' are close to each other. The gear case side projecting piece 35 ′ and the cover side projecting piece 39 ′ can be brought into close contact with each other as long as the regular mounting surfaces 36 ′ and 40 ′ are in contact with each other, but the back surfaces 37 ′ and 41 ′ are in an angle with each other. Since they are different, they are not in close contact. However, as shown in FIG. 10, the screw 34 'is inserted into the through hole 42' of the cover-side protruding piece 39 'even in the wrong state where the back surfaces 37' and 41 'are closest to each other and face each other. However, it is not impossible to forcibly connect the screw 34 ′ to the through hole (screw hole) 38 ′ of the gear case side protruding piece 35 ′.

このような誤った取付作業が行われることは、防止しなければならない。そのため、従来、図１１に示すように、誤った取付方法での取付作業は不能となるように、前記カバー１１’には、三つの内向き爪２７’の内のいずれかの内向き爪の周方向の一端部に、前記円筒部２６’の軸線Ｘ’方向へ突出する小さな突起状のストッパ４３’が形成されていた。このストッパ４３’は、図１３に示すように、前記カバー１１’の前記ギアケース１０’への嵌合状態において、前記外向き爪２７’の周方向の端部に当接し、図１３で見て、前記カバー１１’を前記ギアケース１０’上で時計回り方向に大きく回動させることができないように、前記カバー１１’の逆方向への回動を規制する。これにより、前記裏面３７’，４１’同士を最も接近させて対面させた誤った状態で前記突片３５’，３９’同士を固着することが有効に防止されていた。
実公平２−６７３５号公報 Such erroneous installation work must be prevented. Therefore, conventionally, as shown in FIG. 11, the cover 11 ′ has any one of the three inward nails 27 ′ in the cover 11 ′ so that the attachment work by an incorrect attachment method is impossible. At one end in the circumferential direction, a small protrusion-like stopper 43 ′ protruding in the direction of the axis X ′ of the cylindrical portion 26 ′ was formed. As shown in FIG. 13, the stopper 43 ′ is in contact with the circumferential end of the outward claw 27 ′ when the cover 11 ′ is fitted to the gear case 10 ′. Thus, the rotation of the cover 11 ′ in the reverse direction is restricted so that the cover 11 ′ cannot be largely rotated clockwise on the gear case 10 ′. This effectively prevents the protrusions 35 ′ and 39 ′ from being fixed in an erroneous state in which the back surfaces 37 ′ and 41 ′ are closest to each other and face each other.
Japanese Utility Model Publication No. 2-6735

しかしながら、前記従来の構成によれば、図１３で見て、前記ストッパ４３’が、前記ギアケース１０’上における前記カバー１１’の反時計回り方向への回動角度をも所定の角度範囲（互いに隣接する外向き爪２７’，２７’同士の間の角度範囲）に規制してしまうことになるので、前記ギアケース１０’と前記カバー１１’との嵌合可能角度位置は複数あるのに、実際には、正しい嵌合角度位置は一つしかないことになる。すなわち、前記ストッパ４３’が互いに隣接する前記外向き爪２７’，２７’同士の間にあり、且つ、該外向き爪２７’，２７’同士の間の角度範囲を前記ストッパ４３’が移動する間に前記カバー側突片３９’と前記ギアケース側突片３５’の前記正取付面３６’，４０’同士が面接触し得る嵌合角度位置（図１３の嵌合角度位置）のみが、正しい嵌合角度位置であることになる。 However, according to the conventional configuration, as shown in FIG. 13, the stopper 43 ′ has a rotation angle in the counterclockwise direction of the cover 11 ′ on the gear case 10 ′. (The angle range between the adjacent outward claws 27 'and 27'), the gear case 10 'and the cover 11' have a plurality of fitable angular positions. Actually, there is only one correct fitting angle position. That is, the stopper 43 ′ is between the outward claws 27 ′ and 27 ′ that are adjacent to each other, and the stopper 43 ′ moves within an angular range between the outward claws 27 ′ and 27 ′. Only the fitting angle position (fitting angle position in FIG. 13) at which the normal mounting surfaces 36 ′ and 40 ′ of the cover side protruding piece 39 ′ and the gear case side protruding piece 35 ′ can come into surface contact with each other, This is the correct fitting angle position.

よって、この正しい嵌合角度位置以外の嵌合可能角度位置で前記ギアケース１０’と前記カバー１１’とを嵌合させてしまうと、前記ストッパ４３’が邪魔をして、前記突片３５’，３９’の前記正取付面３６’，４０’同士が面接触するまで前記カバー１１’を回動させることができないので、正しい嵌合角度位置を探して再び前記ギアケース１０’と前記カバー１１’との結合・固定作業を行わなければなわず、前記ギアケース１０’と前記カバー１１’との結合・固定作業が煩雑となるという問題があった。 Therefore, if the gear case 10 ′ and the cover 11 ′ are fitted at a fitting angle position other than the correct fitting angle position, the stopper 43 ′ interferes with the projection piece 35 ′. 39 ′, the cover 11 ′ cannot be rotated until the normal mounting surfaces 36 ′, 40 ′ come into surface contact with each other. Therefore, the gear case 10 ′ and the cover 11 are searched again for a correct fitting angle position. There has been a problem that the coupling / fixing operation between the gear case 10 'and the cover 11' becomes complicated.

また、従来、前記正しい嵌合角度位置を表示するために、前記ギアケース１０’と前記カバー１１’とに、それらが正しい嵌合角度位置であるときに互いに一致する一対のマークを目印として予め形成する等の手段も講じられていたが、草刈作業により前記ヘッド部Ｈ’は汚れてしまうので、刈払機の使用によって前記一対のマークは目立たなくなってしまい、前記ヘッド部Ｈ’のメンテナンス時には目印としての機能を果たすことができない等の問題もあった。 Conventionally, in order to display the correct fitting angle position, a pair of marks that coincide with each other when the gear case 10 'and the cover 11' are in the correct fitting angle position are used as marks. However, since the head portion H ′ is soiled by the mowing operation, the pair of marks become inconspicuous due to the use of a brush cutter, and the head portion H ′ is marked during maintenance. There was also a problem such as being unable to fulfill the function as.

本発明は、前記の如き事情に鑑みてなされたもので、前記ギアケース等の特定構造を有する第一部材と、前記カバー等の特定構造を有する第二部材とを、常に正確な角度位置で嵌合させることができる、部材結合構造を提供しようとするものである。 The present invention has been made in view of the above circumstances, and the first member having a specific structure such as the gear case and the second member having the specific structure such as the cover are always in an accurate angular position. It is intended to provide a member coupling structure that can be fitted.

前記課題を解決するため、本発明に係る部材固定構造は、円筒部の外周面上に周方向の間隔をおいて複数の外向き爪を有する第一部材と、取付孔の内周面に周方向の間隔をおいて複数の内向き爪を有する第二部材と、を備えている。前記第一部材と前記第二部材は、それらの軸線を一致させ、且つ、前記外向き爪と前記内向き爪とが周方向に交互に並ぶようにして、前記軸線方向に互いに嵌合させた後に、前記外向き爪と前記内向き爪とが前記軸線方向に重なり合う所定の固定角度位置まで前記軸線を中心として相対回動させて、互いに結合せしめられる。そして、前記複数の外向き爪の配設パターンと前記複数の内向き爪の配設パターンが、前記軸線を中心とする所定の単一の嵌合角度位置でのみ前記第一部材と前記第二部材との互いの嵌合を許容する組み合わせとされている（請求項１）。 In order to solve the above-described problems, a member fixing structure according to the present invention includes a first member having a plurality of outward claws spaced on the outer peripheral surface of the cylindrical portion at a circumferential interval, and a peripheral surface on the inner peripheral surface of the mounting hole. And a second member having a plurality of inward nails at intervals in the direction. The first member and the second member are fitted to each other in the axial direction so that their axes coincide with each other and the outward claws and the inward claws are alternately arranged in the circumferential direction. Thereafter, the outward claws and the inward claws are rotated relative to each other about a predetermined fixed angle position where the axial claws overlap in the axial direction, and are coupled to each other. And the arrangement pattern of the plurality of outward claws and the arrangement pattern of the plurality of inward claws are the first member and the second only at a predetermined single fitting angle position around the axis. It is set as the combination which accept | permits mutual fitting with a member (Claim 1).

本発明によれば、前記複数の外向き爪の配設パターンと前記複数の内向き爪の配設パターンが、前記軸線を中心とする所定の単一の嵌合角度位置でのみ前記第一部材と前記第二部材との互いの嵌合を許容する組み合わせとされているので、前記第一部材と前記第二部材の相互嵌合角度が、ただ一つに限定される。よって、誤った嵌合角度位置で嵌合される可能性がなく、前記第一部材と前記第二部材の結合・固定作業が正確且つ円滑に行える。 According to the present invention, the arrangement pattern of the plurality of outward claws and the arrangement pattern of the plurality of inward claws are the first member only at a predetermined single fitting angle position centered on the axis. And the second member are allowed to be fitted to each other, the mutual fitting angle between the first member and the second member is limited to only one. Therefore, there is no possibility of fitting at an incorrect fitting angle position, and the first member and the second member can be connected and fixed accurately and smoothly.

前記第一部材と前記第二部材は、前記特徴を有するものであればその具体例に限定はないが、好適な実施の形態として、公知の部材としての例を挙げると、前記第一部材が刈払機のギアケースであり、前記第二部材が、前記ギアケースから突出した回転駆動軸に固着される刈刃と、前記ギアケースと、の間に刈草が絡み付いてしまうことを防止するカバーであるものとすることができる（請求項２）。 The first member and the second member are not limited to specific examples as long as the first member and the second member have the above characteristics, but as a preferred embodiment, as an example of a known member, the first member is A gear case of a brush cutter, wherein the second member is a cover for preventing the grass from being entangled between the cutting blade fixed to the rotary drive shaft protruding from the gear case and the gear case. It can be (claim 2).

以下、添付図面を参照して、本発明の実施の一形態について説明する。 Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

図１は、本発明の一実施の形態に係る部材結合構造が適用可能な構造体の一例としての刈払機の斜視図、図２は、図１の刈払機のヘッド部の拡大側面図、図３は、図２の分解斜視図、図４は、図３中のカバーの裏面図（下面図）、図５は、図３中のギアケースの裏面図（下面図）、図６は、図５のギアケースに図４のカバーを嵌合させた状態の裏面図、図７は、図７のカバーを正規の固定角度位置まで回動させた状態の裏面図、図８は、図７のＶＩＩＩ−ＶＩＩＩ矢視拡大断面図、図９は、正規の固定状態を示す、図７の一部切欠図、図１０は、誤った固定状態を示す一部切欠裏面図である。 1 is a perspective view of a brush cutter as an example of a structure to which a member coupling structure according to an embodiment of the present invention can be applied. FIG. 2 is an enlarged side view of a head portion of the brush cutter in FIG. 3 is an exploded perspective view of FIG. 2, FIG. 4 is a back view (bottom view) of the cover in FIG. 3, FIG. 5 is a back view (bottom view) of the gear case in FIG. 3, and FIG. 4 is a rear view in a state where the cover of FIG. 4 is fitted to the gear case of FIG. 5, FIG. 7 is a rear view of the state in which the cover of FIG. 7 is rotated to a regular fixed angle position, and FIG. VIII-VIII arrow enlarged sectional view, FIG. 9 is a partially cutaway view of FIG. 7 showing a normal fixed state, and FIG. 10 is a partially cutaway rear view showing an incorrect fixed state.

本発明に係る部材結合構造は、互いに対応する特定構造を有する第一部材と第二部材との間で広く適用することができるが、本実施の形態では、その具体例として、刈払機１のヘッド部Ｈについて適用したものについて説明する。この場合、該ヘッド部Ｈを構成するギアケース１０が前記第一部材、前記ギアケース１０に結合・固定される絡み付き防止用のカバー１１が前記第二部材ということになる。 The member coupling structure according to the present invention can be widely applied between the first member and the second member having specific structures corresponding to each other, but in the present embodiment, as a specific example of the brush cutter 1, What is applied to the head portion H will be described. In this case, the gear case 10 constituting the head portion H is the first member, and the tangling prevention cover 11 coupled and fixed to the gear case 10 is the second member.

まず、前記刈払機１の一例について簡単に説明すると、該刈払機１は、図１に示すように、操作ハンドル２を有する操作桿３の先端部３ａに、円板状等の刈刃４を備えるとともに、前記操作桿３の後端部３ｂに、前記刈刃４の駆動源としての小型の内燃エンジン部５を備えている。作業者は、例えば、前記操作桿３の後部側に取り付けられたベルト掛け金具６に図示しない肩掛ベルトを引っ掛けて、該肩掛ベルトで前記エンジン部５を保持し、前記操作ハンドル２の左右のグリップ部２ａ，２ｂを握って、前記操作ハンドル２に取り付けられた出力制御レバー７を操作して、前記刈刃４を左右に揺動させながら草刈作業を行う。 First, an example of the brush cutter 1 will be briefly described. As shown in FIG. 1, the brush cutter 1 is provided with a disc-shaped cutting blade 4 on the tip 3 a of an operation rod 3 having an operation handle 2. In addition, a small internal combustion engine portion 5 as a drive source for the cutting blade 4 is provided at the rear end portion 3 b of the operation rod 3. For example, an operator hooks a shoulder belt (not shown) on a belt hanging bracket 6 attached to the rear side of the operation rod 3, holds the engine unit 5 with the shoulder belt, and grips the left and right grips of the operation handle 2. Holding the parts 2a and 2b and operating the output control lever 7 attached to the operation handle 2, the mowing operation is performed while swinging the cutting blade 4 left and right.

図２に示すように、前記操作桿３の前記先端部３ａと、前記刈刃４と、の間には、前記ヘッド部Ｈとして、前記ギアケース１０と、前記カバー１１と、の結合部品が介在している。前記ギアケース１０は、二つのベベルギアの組み合わせを含む図示しない歯車伝動機構を収容しており、この歯車伝動機構は、前記操作桿３に内挿された伝動軸１２から前記刈刃４へと、前記エンジン部５の回転駆動力を伝達する。前記カバー１１は、前記ギアケース１０への結合・固定状態において、前記ギアケース１０の周囲から前記刈刃４の上面すれすれの位置までスカート状に延在する。そして、前記カバー４は、草刈作業中に、前記刈刃４と前記ギアケース１０との間に、刈草や、捨てられたビニールシート等の異物が絡み付いてしまうことを防止する。 As shown in FIG. 2, a coupling component of the gear case 10 and the cover 11 is provided as the head portion H between the distal end portion 3 a of the operation rod 3 and the cutting blade 4. Intervene. The gear case 10 accommodates a gear transmission mechanism (not shown) including a combination of two bevel gears. The gear transmission mechanism extends from the transmission shaft 12 inserted into the operation rod 3 to the cutting blade 4. The rotational driving force of the engine unit 5 is transmitted. The cover 11 extends in the form of a skirt from the periphery of the gear case 10 to a position where the upper surface of the cutting blade 4 passes in the coupled and fixed state to the gear case 10. The cover 4 prevents entanglement of foreign matter such as mowing grass and a discarded vinyl sheet between the cutting blade 4 and the gear case 10 during the mowing operation.

図２の分解斜視図である図３において、前記ギアケース１０から下向きに延び出した回転駆動軸１３には、その下端部に雄ねじ部１４が形成され、該雄ねじ部１４より上の部分に、スプライン部１５が形成されている。前記回転駆動軸１３には、前記スプライン部１５とのスプライン嵌合により、円板状の刈刃受け部材１６が嵌着されている。該刈刃受け部材１６は、その下面の中央部に、下向きの刈刃取付用円形凸部１７を備え、該刈刃取付用円形凸部１７の回りに、前記回転駆動軸１３に直角な下向きの刈刃受け面１８を備えている。 In FIG. 3, which is an exploded perspective view of FIG. 2, the rotary drive shaft 13 extending downward from the gear case 10 is formed with a male screw portion 14 at a lower end portion thereof, and a portion above the male screw portion 14 is formed. A spline portion 15 is formed. A disc-shaped cutting blade receiving member 16 is fitted to the rotary drive shaft 13 by spline fitting with the spline portion 15. The cutting blade receiving member 16 is provided with a downward-facing circular protrusion 17 for attaching a cutting blade at the center of the lower surface thereof, and is directed downward at a right angle to the rotary drive shaft 13 around the circular convex portion 17 for mounting a cutting blade. The cutting blade receiving surface 18 is provided.

前記回転駆動軸１３には、前記刈刃受け部材１６の次に、前記刈刃４、ナットカバーを兼ねる刈刃押え部材１９、座金付きの止めナット２０の順に、それらの部材が取付けられる。 After the cutting blade receiving member 16, these members are attached to the rotary drive shaft 13 in the order of the cutting blade 4, a cutting blade pressing member 19 that also serves as a nut cover, and a set nut 20 with a washer.

前記刈刃４は、その中央部に形成された円形取付孔４ａに、前記刈刃受け部材１６の前記刈刃取付用円形凸部１７を嵌め込むようにして、前記刈刃受け部材１６に対して取り付けられる。前記刈刃４の上面は、その取付状態において、前記刈刃受け部材１６の前記刈刃受け面１８に面接触する。 The cutting blade 4 is attached to the cutting blade receiving member 16 so that the circular mounting portion 17 for mounting the cutting blade of the cutting blade receiving member 16 is fitted into a circular mounting hole 4a formed at the center thereof. It is done. The upper surface of the cutting blade 4 is in surface contact with the cutting blade receiving surface 18 of the cutting blade receiving member 16 in the attached state.

前記刈刃押え部材１９も、前記回転駆動軸１３に対して、前記スプライン部１５とのスプライン嵌合により嵌着される。前記刈刃押え部材１９の次に前記回転駆動軸１３の前記雄ねじ部１４に前記止めナット２０をねじ結合させることにより、前記刈刃押え部材１９は、前記刈刃受け部材１６側へと押圧される。これにより、該刈刃受け部材１６と前記刈刃押え部材１９との間で前記刈刃４がしっかりと挾持される。 The cutting blade pressing member 19 is also fitted to the rotary drive shaft 13 by spline fitting with the spline portion 15. The cutting blade holding member 19 is pressed toward the cutting blade receiving member 16 by screwing the retaining nut 20 to the male screw portion 14 of the rotary drive shaft 13 next to the cutting blade holding member 19. The As a result, the cutting blade 4 is firmly held between the cutting blade receiving member 16 and the cutting blade pressing member 19.

なお、前記ギアケース１０には、回り止め棒２１の挿通孔２２が形成され、前記刈刃受け部材１６には、前記回り止め棒２１の係合凹部２３が形成されている。前記止めナット２０を締めたり緩めたりする時には、前記挿通孔２２に前記回り止め棒２１を上から挿通し、前記係合凹部２３に前記回り止め棒２１の下端部を係合させることにより、前記刈刃受け部材１６を介して、前記回転駆動軸１３を回転不能に固定することができる。 The gear case 10 is formed with an insertion hole 22 for the rotation stopper 21, and the cutting blade receiving member 16 is formed with an engagement recess 23 for the rotation stopper 21. When the locking nut 20 is tightened or loosened, the locking rod 21 is inserted into the insertion hole 22 from above, and the lower end portion of the locking rod 21 is engaged with the engagement recess 23 to thereby The rotary drive shaft 13 can be fixed to be non-rotatable via the cutting blade receiving member 16.

次に、本発明の要部となる、前記ギアケース１０と前記カバー１１との結合構造について、詳細に説明する。 Next, a coupling structure between the gear case 10 and the cover 11 that is a main part of the present invention will be described in detail.

図３に示すように、一般に鋳造品として成型される前記ギアケース１０のケース本体２４の下部には、段部２５を介して、下向きの円筒部２６が一体に形成されている。前記回転駆動軸１３は、前記ギアケース１０内に収容されている前記歯車伝動機構に駆動上連結され、前記円筒部２６から同心に下向きに突出している。前記円筒部２６の外周面には、複数の外向き爪、限定はされないが、具体的には三つの外向き爪２７が、周方向に角度間隔をおいて形成されている。前記各外向き爪２７は、前記円筒部２６の軸線Ｘ方向の厚みと、前記円筒部２６の周方向の長さと、を備えている。前記外向き爪２７の内の一つは、前記回り止め棒２１との接触を避けるための凹状の切欠２８を備えている。 As shown in FIG. 3, a downward cylindrical portion 26 is formed integrally with a lower portion of the case body 24 of the gear case 10 that is generally molded as a cast product via a step portion 25. The rotary drive shaft 13 is connected to the gear transmission mechanism housed in the gear case 10 for driving, and protrudes downward from the cylindrical portion 26 concentrically. A plurality of outward claws, which are not limited, are formed on the outer peripheral surface of the cylindrical portion 26. Specifically, three outward claws 27 are formed at angular intervals in the circumferential direction. Each of the outward claws 27 includes a thickness in the axis X direction of the cylindrical portion 26 and a length in the circumferential direction of the cylindrical portion 26. One of the outward claws 27 is provided with a concave notch 28 for avoiding contact with the detent bar 21.

図５に示すように、前記各外向き爪２７の外周面は、前記円筒部２６より一回り大きい大径仮想円筒面Ｃ１上に位置している。また、図３及び図８に示すように、前記各外向き爪２７と前記段部２５との間には、前記カバー１１に形成された内向き爪３０が前記円筒部２６の周方向にスライドしながら実質的に隙間なく入り込めるだけの内向き爪受入間隙２９が設けられている。 As shown in FIG. 5, the outer peripheral surface of each outward claw 27 is positioned on a large-diameter virtual cylindrical surface C 1 that is slightly larger than the cylindrical portion 26. As shown in FIGS. 3 and 8, an inward claw 30 formed on the cover 11 slides in the circumferential direction of the cylindrical portion 26 between the outward claws 27 and the step portion 25. However, an inward nail receiving gap 29 is provided so that it can enter substantially without any gap.

一方、前記カバー１１は、一般にプラスチックの成型品であり、図３及び図４に示すように、円形のスカート状本体３１の中央部に、円形の取付孔３２を同心に有している。この取付孔３２は、前記ギアケース１０の前記円筒部２６に前記カバー１１を同心に結合させるためのものであり、前記大径仮想筒面Ｃ１にちょうど嵌り込むだけの内径を有している。また、前記取付孔３２の内周面には、前記外向き爪２７と同数の複数の前記内向き爪３０、具体的には三つの前記内向き爪３０が、周方向に角度間隔をおいて形成されている。 On the other hand, the cover 11 is generally a plastic molded product, and has a circular attachment hole 32 concentrically at the center of a circular skirt-shaped body 31, as shown in FIGS. The mounting hole 32 is for concentrically connecting the cover 11 to the cylindrical portion 26 of the gear case 10, and has an inner diameter that just fits into the large-diameter virtual cylindrical surface C1. Further, on the inner peripheral surface of the mounting hole 32, the same number of the inward nails 30 as the outward claws 27, specifically, the three inward nails 30 are arranged at an angular interval in the circumferential direction. Is formed.

前記各内向き爪３０は、前記取付孔３２の軸線Ｘ方向の厚みと、前記取付孔３２の周方向の長さと、を備えている。前記内向き爪３０の内の一つは、前記回り止め棒２１との接触を避けるための凹状の切欠３３を備えている。図４に示すように、前記各内向き爪３０の内周面は、前記ギアケース１０の前記円筒部２６にちょうど嵌り込むだけの小径仮想円筒面Ｃ２上に位置している。 Each inward claw 30 includes a thickness in the axis X direction of the mounting hole 32 and a circumferential length of the mounting hole 32. One of the inward claws 30 is provided with a concave notch 33 for avoiding contact with the detent bar 21. As shown in FIG. 4, the inner peripheral surface of each inward claw 30 is located on a small-diameter virtual cylindrical surface C 2 that just fits into the cylindrical portion 26 of the gear case 10.

図６に示すように、複数の前記外向き爪２７の配設パターンと複数の前記内向き爪３０の配設パターンは、前記軸線Ｘを中心とする所定の単一の嵌合角度位置でのみ前記ギアケース１０と前記カバー１１との互いの嵌合を許容する組み合わせとされている。したがって、前記所定の単一の嵌合角度位置以外では、前記ギアケース１０と前記カバー１１とを互いに嵌合させることができないようになっている。ここで、前記外向き爪の配設パターンとは、前記円筒部２６上における前記各外向き爪の周方向の長さ及び前記各外向き爪同士の間の角度間隔の態様を言い、同様に、前記内向き爪の配設パターンとは、前記取付孔３２上における前記内向き爪の周方向の長さ及び前記各内向き爪同士の間の角度間隔の態様を言う。 As shown in FIG. 6, the arrangement pattern of the plurality of outward claws 27 and the arrangement pattern of the plurality of inward claws 30 are only at a predetermined single fitting angle position about the axis X. The gear case 10 and the cover 11 are combined to allow mutual fitting. Therefore, the gear case 10 and the cover 11 cannot be fitted to each other except for the predetermined single fitting angle position. Here, the arrangement pattern of the outward claws means the aspect of the circumferential length of the outward claws on the cylindrical portion 26 and the angular interval between the outward claws. The arrangement pattern of the inward nails refers to the aspect of the circumferential length of the inward nails on the mounting hole 32 and the angular interval between the inward nails.

本実施の形態では、図６に示すように、前記各内向き爪３０は、前記ギアケース１０の前記円筒部２６の前記外向き爪２７同士の間のいずれか特定の間隔にのみ嵌め込み可能な大きさ（周方向の長さ）とされている。同様に、前記ギアケース１０の前記各外向き爪２７も、前記カバー１１の前記内向き爪３０同士の間のいずれか特定の間隔にのみ嵌め込み可能な大きさ（周方向の長さ）とされている。 In the present embodiment, as shown in FIG. 6, each inward claw 30 can be fitted only at a specific interval between the outward claws 27 of the cylindrical portion 26 of the gear case 10. The size is the length in the circumferential direction. Similarly, each of the outward claws 27 of the gear case 10 has a size (a length in the circumferential direction) that can be fitted only at a specific interval between the inward claws 30 of the cover 11. ing.

したがって、前記ギアケース１０と前記カバー１１は、それらの軸線Ｘを一致させて、すなわち、それらの軸線を共通軸線Ｘとして、前記各外向き爪２７が前記内向き爪３０同士の間の各間隔に嵌り込む（このとき、必然的に、前記各内向き爪３０が前記外向き爪２７同士の間の各間隔に嵌り込む）単一の嵌合可能角度位置でのみ、前記内向き爪３０が前記段部２５に当接するセット位置まで嵌合させることができる。 Therefore, the gear case 10 and the cover 11 have their axes X coincided, that is, each of the gaps between the outward claws 27 between the inward claws 30 with the axes being the common axis X. (At this time, the inward nails 30 are necessarily fitted in the intervals between the outward claws 27), and the inward nails 30 are only in a single fittable angular position. It can be fitted to the set position where it abuts on the stepped portion 25.

このセット位置まで双方を嵌合させたとき、前記内向き爪３０と前記外向き爪２７は、前記円筒部２６の周方向に交互に並び、且つ、前記共通軸線Ｘに沿って互いに位置ずれした位置関係、詳しくは、前記内向き爪３０の下面と前記外向き爪２７の上面とがごく僅かだけ上下にずれている位置関係にある。このため、前記セット位置から、前記ギアケース１０と前記カバー１１とを、前記外向き爪２７と前記内向き爪３０とが互いに重なり合う角度位置まで、前記共通軸線Ｘを中心として相対回動させると、図７及び図８に示すように、前記各内向き爪３０が、それに隣接する前記内向き爪受入間隙２９に摺接状態で入り込む。これにより、前記カバー１１は、前記ギアケース１０から軸線Ｘ方向へは抜け出すことができなくなる。 When both are fitted to the set position, the inward claws 30 and the outward claws 27 are alternately arranged in the circumferential direction of the cylindrical portion 26 and are displaced from each other along the common axis X. The positional relationship, specifically, the positional relationship in which the lower surface of the inward claw 30 and the upper surface of the outward claw 27 are slightly shifted up and down. Therefore, when the gear case 10 and the cover 11 are relatively rotated around the common axis X from the set position to the angular position where the outward claws 27 and the inward claws 30 overlap each other. 7 and 8, each inward claw 30 enters the inward claw receiving gap 29 adjacent thereto in a sliding state. As a result, the cover 11 cannot be removed from the gear case 10 in the direction of the axis X.

図３及び図５に示すように、前記ギアケース１０の前記ケース本体２４の下面には、前記円筒部２６の外周面の外側となる位置に、前記カバー１１をねじ３４で固定するためのギアケース側突片３５が一体に形成されている。このギアケース側突片３５は、正取付面３６とその裏面３７とを有するとともに、前記正取付面３６から前記裏面３７への貫通孔３８を有している。この貫通孔３８の内周面には雌ねじが形成されている。 As shown in FIGS. 3 and 5, a gear for fixing the cover 11 with a screw 34 on the lower surface of the case body 24 of the gear case 10 at a position outside the outer peripheral surface of the cylindrical portion 26. The case side protruding piece 35 is integrally formed. The gear case-side protruding piece 35 has a regular attachment surface 36 and a back surface 37 thereof, and has a through hole 38 from the regular attachment surface 36 to the back surface 37. An internal thread is formed on the inner peripheral surface of the through hole 38.

同様に、図３及び図４に示すように、前記カバー１１の上面には、前記取付孔３２の外側となる位置に、前記ギアケース側突片３５に対応する形状のカバー側突片３９が一体に形成されている。このカバー側突片３９も、正取付面４０とその裏面４１とを有するとともに、前記正取付面４０から前記裏面４１への貫通孔４２を有している。但し、この貫通孔４２の内周面には、必ずしも雌ねじは必要ない。 Similarly, as shown in FIGS. 3 and 4, a cover side protrusion 39 having a shape corresponding to the gear case side protrusion 35 is provided on the upper surface of the cover 11 at a position outside the attachment hole 32. It is integrally formed. The cover-side protruding piece 39 also has a regular attachment surface 40 and a back surface 41 thereof, and also has a through hole 42 from the regular attachment surface 40 to the back surface 41. However, an internal thread is not necessarily required on the inner peripheral surface of the through hole 42.

前記セット位置から前記ギアケース１０と前記カバー１１とを相対回動させることにより、図７に示すように、前記ギアケース側突片３５と前記カバー側突片３９の前記正取付面３６，４０同士が対面して密着する正規の固定角度位置へと移行させることができる。この正規の固定角度位置で、前記貫通孔３８，４２同士が一直線に連通する。そこで、図９に示すように、前記カバー側突片３９の前記貫通孔４２に前記ねじ３４を挿通し、このねじ３４を前記ギアケース側突片３５の前記貫通孔３８にねじ結合させることで、前記カバー１１を前記ギアケース１０に対して結合・固定することができる。 By rotating the gear case 10 and the cover 11 relative to each other from the set position, the normal mounting surfaces 36, 40 of the gear case side protruding piece 35 and the cover side protruding piece 39 are shown in FIG. It is possible to shift to a regular fixed angle position where they face each other and are in close contact with each other. At the regular fixed angle position, the through holes 38 and 42 communicate with each other in a straight line. Therefore, as shown in FIG. 9, the screw 34 is inserted into the through hole 42 of the cover-side protruding piece 39, and the screw 34 is screwed to the through-hole 38 of the gear case-side protruding piece 35. The cover 11 can be coupled and fixed to the gear case 10.

この結合・固定状態においては、図７及び図８に示すように、前記外向き爪２７と前記内向き爪３０とが互いに重なり合っている。このため、ねじ止め箇所が一箇所だけしかなくても、前記ギアケース１０に対する前記カバー１１の結合は、前記共通軸線Ｘの方向にも前記円筒部２６の半径方向にも全く緩みのない、確実なものとなる。 In this coupled / fixed state, as shown in FIGS. 7 and 8, the outward claws 27 and the inward claws 30 overlap each other. For this reason, even if there is only one screwing point, the coupling of the cover 11 to the gear case 10 is not loose at all in the direction of the common axis X and the radial direction of the cylindrical portion 26. It will be something.

前記ギアケース１０及び前記カバー１１における前記外向き爪２７及び前記内向き爪３０の配設数は、本実施の形態では三つとされているが、それぞれ、二つでも良いし、四つ以上であっても良い。とにかく、前記外向き爪２７と前記内向き爪３０とが周方向に交互に並ぶようにして前記ギアケース１０と前記カバー１１を前記軸線Ｘ方向に互いに嵌合させた後に、前記外向き爪２７と前記内向き爪３０とが前記軸線Ｘ方向に重なり合う所定の固定角度位置まで前記軸線Ｘを中心として相対回動させて前記ギアケース１０と前記カバー１１とが互いに結合せしめられるものであって、所定の単一の嵌合角度位置以外では、前記ギアケース１０と前記カバー１１とを互いに嵌合させることができない態様であれば良い。 In the present embodiment, the number of the outward claws 27 and the inward claws 30 in the gear case 10 and the cover 11 is three. However, the number may be two, or four or more. There may be. In any case, after the outward claws 27 and the inward claws 30 are alternately arranged in the circumferential direction, the gear case 10 and the cover 11 are fitted to each other in the axis X direction, and then the outward claws 27. The gear case 10 and the cover 11 are coupled to each other by relatively rotating about the axis X to a predetermined fixed angle position where the inward claw 30 and the inward claw 30 overlap in the axis X direction, It is sufficient that the gear case 10 and the cover 11 cannot be fitted to each other except for a predetermined single fitting angle position.

前記ギアケース１０と前記カバー１１は、所定の単一の嵌合角度位置以外では互いに嵌合させることができないので、誤った嵌合角度位置でそれらを互いに嵌合させる余地がない。そして、前記単一の嵌合角度位置で前記ギアケース１０と前記カバー１１とを前記セット位置まで嵌合させ、前記ギアケース側突片３５と前記カバー側突片３９の前記正取付面３６，４０同士が面接触する前記正規の固定角度位置まで、前記ギアケース１０と前記カバー１１の少なくともいずれかを回動させることにより、図７及び図９に示すように、前記ギアケース側突片３５と前記カバー側突片３９とを正しく固着させ、前記ギアケース１０に対して前記カバー１１を正しく固着させることができる。 Since the gear case 10 and the cover 11 cannot be fitted to each other except at a predetermined single fitting angle position, there is no room for fitting them at the wrong fitting angle position. Then, the gear case 10 and the cover 11 are fitted to the set position at the single fitting angle position, and the gear case side projecting piece 35 and the cover side projecting piece 39 are attached to the front mounting surfaces 36, By rotating at least one of the gear case 10 and the cover 11 to the regular fixed angle position where the surfaces 40 are in surface contact with each other, as shown in FIGS. And the cover-side protruding piece 39 can be correctly fixed, and the cover 11 can be correctly fixed to the gear case 10.

ところで、図６で見て、前記カバー１１が前記ギアケース１０上で、時計回り方向へも反時計回り方向へも回動自在であると、図１０に示すように、前記ギアケース側突片３５と前記カバー側突片３９とを、それらの前記裏面３７，４１同士を対面させる誤った取付状態でねじ止めしてしまう危険がある。前記ギアケース側突片３５と、前記カバー側突片３９は、前記正取付面３６，４０同士であれば密着させることができるが、前記裏面３７，４１同士は、角度が一致しないので、密着状態とはならない。しかし、図１０に示すように、前記裏面３７，４１同士を最も接近させて対面させた誤った状態でも、前記カバー側突片３９の前記貫通孔４２に前記ねじ３４を挿通し、このねじ３４を前記ギアケース側突片３５の前記貫通孔３８に無理やりねじ結合させることは、あり得ないことではない。 By the way, as shown in FIG. 6, when the cover 11 is rotatable on the gear case 10 both in the clockwise direction and in the counterclockwise direction, as shown in FIG. There is a risk that the cover 35 and the cover-side protruding piece 39 may be screwed in an incorrect mounting state in which the back surfaces 37 and 41 face each other. The gear case side projecting piece 35 and the cover side projecting piece 39 can be brought into close contact with each other as long as the regular attachment surfaces 36 and 40 are in contact with each other. It does not become a state. However, as shown in FIG. 10, the screw 34 is inserted into the through hole 42 of the cover-side projecting piece 39 even in the wrong state where the back surfaces 37 and 41 are closest to each other and face each other. It is not impossible to forcibly screw the screw into the through-hole 38 of the gear case side protruding piece 35.

このような誤った取付作業が行われることは、防止しなければならない。そのため、本実施の形態では、誤った固定角度位置でのねじ止め作業は不可能となるように、次の手段を講じている。すなわち、前記カバー１１には、三つの内向き爪２７の内のいずれかの内向き爪の周方向の一端部に、前記円筒部２６の軸線Ｘ方向へ突出する小さな突起状のストッパ４３が形成されている。このストッパ４３は、図６に示すように、前記カバー１１の前記ギアケース１０への単一の嵌合角度位置における嵌合状態において、前記外向き爪２７の周方向の端部に当接し、図６で見て、前記カバー１１を前記ギアケース１０上で時計回り方向に大きく回動させることができないように、前記カバー１１の逆方向への回動を規制する。これにより、前記裏面３７，４１同士を最も接近させて対面させた誤った状態（図１０の状態）で前記突片３５，３９同士を固着することが有効に防止される。 Such erroneous installation work must be prevented. Therefore, in the present embodiment, the following means are taken so that screwing work at an incorrect fixed angle position is impossible. In other words, the cover 11 is formed with a small protrusion-like stopper 43 that protrudes in the direction of the axis X of the cylindrical portion 26 at one end in the circumferential direction of any of the three inward claws 27. Has been. As shown in FIG. 6, the stopper 43 is in contact with the end portion in the circumferential direction of the outward claw 27 in a fitted state at a single fitting angle position of the cover 11 to the gear case 10, As shown in FIG. 6, the rotation of the cover 11 in the reverse direction is restricted so that the cover 11 cannot be largely rotated clockwise on the gear case 10. This effectively prevents the projecting pieces 35 and 39 from being fixed together in an erroneous state (the state shown in FIG. 10) in which the back surfaces 37 and 41 are closest to each other and face each other.

なお、前記カバー１１の逆方向（図６で見て時計回り方向）への回動を規制するストッパの配設位置は、本実施の形態のものには限定されず、前記ギアケース１０と前記カバー１１の少なくともいずれか一方に、その他方へ当接して前記ストッパ４３と同様に機能するように配設すれば良い。 The position of the stopper that restricts the rotation of the cover 11 in the reverse direction (clockwise as viewed in FIG. 6) is not limited to that of the present embodiment, and the gear case 10 and the What is necessary is just to arrange | position at least any one of the cover 11 so that it may contact | abut to the other direction and may function similarly to the said stopper 43. FIG.

本発明の一実施の形態に係る部材結合構造が適用可能な構造体の一例としての刈払機の斜視図である。1 is a perspective view of a brush cutter as an example of a structure to which a member coupling structure according to an embodiment of the present invention is applicable. 図１の刈払機のヘッド部の拡大側面図である。It is an enlarged side view of the head part of the brush cutter of FIG. 図２の分解斜視図である。FIG. 3 is an exploded perspective view of FIG. 2. 図３中のカバーの裏面図（下面図）である。FIG. 4 is a rear view (bottom view) of the cover in FIG. 3. 図３中のギアケースの裏面図（下面図）である。FIG. 4 is a back view (bottom view) of the gear case in FIG. 3. 図５のギアケースに図４のカバーを嵌合させた状態の裏面図である。FIG. 6 is a rear view of the gear case of FIG. 5 in a state where the cover of FIG. 4 is fitted. 図６のカバーを正規の固定角度位置まで回動させた状態の裏面図である。It is a reverse view of the state which rotated the cover of FIG. 6 to the regular fixed angle position. 図７のＶＩＩＩ−ＶＩＩＩ矢視拡大断面図である。It is a VIII-VIII arrow expanded sectional view of FIG. 正規の固定状態を示す、図７の一部切欠図である。FIG. 8 is a partially cutaway view of FIG. 7 showing a regular fixed state. 誤った固定状態を示す一部切欠裏面図である。It is a partially cutaway back view showing an incorrect fixed state. 従来のカバーの裏面図（下面図）である。It is a back view (bottom view) of the conventional cover. 従来のギアケースの一部を裏側から示した斜視図である。It is the perspective view which showed a part of conventional gear case from the back side. 図１２のギアケースに図１１のカバーを嵌合させた状態の裏面図である。FIG. 13 is a rear view of the gear case of FIG. 12 with the cover of FIG. 11 fitted thereto.

Explanation of symbols

１刈払機
１０第一部材（ギアケース）
１１第二部材（カバー）
２６円筒部
２７外向き爪
３０内向き爪
３２取付孔
Ｘ軸線 1 Brush cutter 10 First member (gear case)
11 Second member (cover)
26 Cylinder 27 Outward Claw 30 Inward Claw 32 Mounting Hole X Axis

Claims

A first member (10) having a plurality of outward claws (27) with a circumferential interval on the outer peripheral surface of the cylindrical portion (26), and a circumferential interval on the inner peripheral surface of the mounting hole (32). A second member (11) having a plurality of inward nails (30), the axes (X) of the first member (10) and the second member (11) are aligned, and With the outward claws (27) and the inward claws (30) arranged alternately in the circumferential direction, the first member (10) and the second member (11) are mutually connected in the axis (X) direction. After the fitting, the outward claws (27) and the inward claws (30) are relatively rotated around the axis (X) to a predetermined fixed angle position where they overlap in the axis (X) direction. A member coupling structure in which the first member (10) and the second member (11) are coupled to each other. The arrangement pattern of the outward claws (27) and the arrangement pattern of the plurality of inward claws (30) are the first only at a predetermined single fitting angle position centered on the axis (X). A member coupling structure in which the member (10) and the second member (11) are allowed to be fitted together.

The first member is a gear case (10) of a brush cutter (1), and the second member is a cutting blade (4) fixed to a rotary drive shaft (13) protruding from the gear case (10). 2. The member coupling structure according to claim 1, wherein the member coupling structure is a cover (11) that prevents the mowing grass from being entangled with the gear case (10).