JP4682349B2

JP4682349B2 - Member connection structure

Info

Publication number: JP4682349B2
Application number: JP2006162119A
Authority: JP
Inventors: 雅夫岩田; 政幸西出; 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: 2011-05-11
Anticipated expiration: 2026-06-12
Also published as: JP2007332984A

Description

本発明は、部材結合構造に関し、詳しくは、共通軸線の回りで互いに嵌合し得る複数の嵌合可能角度位置を有する第一部材及び第二部材を備え、前記第一部材は、正取付面と、その裏面と、前記正取付面から前記裏面への貫通孔と、を有する第一部材側突片を備え、前記第二部材は、正取付面と、その裏面と、前記正取付面から前記裏面への貫通孔と、を有する第二部材側突片を備え、前記第一部材と前記第二部材とを互いに嵌合させた後に前記共通軸線を中心としてそれらを相対的に逆方向へと回動させることにより、前記第一部材側突片の前記正取付面と前記第二部材側突片の前記正取付面とを面接触させ、前記第一部材側突片の前記貫通孔と前記第二部材側突片の前記貫通孔とにねじを挿通して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, includes a first member and a second member having a plurality of matable angular positions that can be fitted to each other around a common axis, and the first member is a positive mounting surface. And a first member-side projecting piece having a back surface thereof and a through hole from the regular mounting surface to the back surface, and the second member includes a regular mounting surface, a back surface thereof, and the regular mounting surface. A second member-side projecting piece having a through-hole to the back surface, and after the first member and the second member are fitted to each other, they are relatively reversed around the common axis. And the normal mounting surface of the first member side protruding piece and the positive mounting surface of the second member side protruding piece are in surface contact with each other, and the through hole of the first member side protruding piece is A member coupling structure in which a screw is inserted through the through hole of the second member side protruding piece and coupled to each other. To.

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１５及び図１６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’を同心に収容する筒部２６’を備えている。該筒部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. 15 and 16, the gear case 10 ′ includes a cylindrical portion 26 ′ that concentrically accommodates the rotational drive shaft 13 ′ via a step portion 25 ′. A plurality of (three in the example of FIG. 16) outward claws 27 ′ are formed around the cylindrical portion 26 ′ with an angular interval therebetween. An inward claw receiving portion that allows an inward claw 30 ', which will be described later, to enter the gap between the outward claw 27' and the stepped portion 25 'substantially without a 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１４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. 14, 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１６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. 16, 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 ′ comes into contact with the step portion 25 ′ at the base of the tube 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１０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. 10, 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 cylinder 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１４，１５，１６の例では三つ）存在することになる。 By the way, each of the inward claws 30 'has a size that can be fitted into any interval 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. 14, 15, and 16) 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１６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１１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１１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。 As shown in FIG. 16, the relative rotation of the cover 11 ′ for bringing the projections 35 ′ and 39 ′ into surface contact with each other after the cover 11 ′ is fitted to the gear case 10 ′. 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 protruding piece 35 ′ and the cover side protruding 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 Since they are different, they are not in close contact. However, as shown in FIG. 11, 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１４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１６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１６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. 14, the cover 11 ′ is provided with any one of the inward nails of the three inward nails 27 ′ so that the attaching operation by an incorrect attaching method is impossible. At one end portion in the circumferential direction, a small protrusion-shaped stopper 43 ′ protruding in the direction of the axis X ′ of the cylindrical portion 26 ′ was formed. As shown in FIG. 16, 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１６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１６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. 16, 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. 16) at which the normal mounting surfaces 36 ′, 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、複数の嵌合可能角度位置のいずれで嵌合させても、それらを相対回動させて正しい状態に結合・固定させることができ、且つ、誤った状態での結合・固定を確実に防止できる、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 circumstances as described above, and a plurality of fitting angles between a first member having a specific structure such as the gear case and a second member having a specific structure such as the cover. Provide a member coupling structure that can be coupled and fixed in the correct state by rotating relative to each other regardless of the position, and can be reliably prevented from being coupled and fixed in the wrong state. It is what.

前記課題を解決するため、本発明に係る部材固定構造は、共通軸線の回りで互いに嵌合し得る複数の嵌合可能角度位置を有する第一部材及び第二部材を備えている。前記第一部材は、正取付面と、その裏面と、前記正取付面から前記裏面への貫通孔と、を有する第一部材側突片を備え、前記第二部材は、正取付面と、その裏面と、前記正取付面から前記裏面への貫通孔と、を有する第二部材側突片を備えている。そして、前記第一部材と前記第二部材は、前記複数の嵌合可能角度位置のいずれからでも、前記正取付面同士を対面させた状態で二つの前記貫通孔にねじを挿通して前記第一部材側突片と前記第二部材側突片とを互いに連結する正規の固定角度位置まで、前記共通軸線を中心として相対回動せしめることができる。さらに、前記第一部材と前記第二部材の少なくともいずれか一方に、前記裏面同士を対面させた誤った状態で二つの前記貫通孔にねじを挿通し得るほどの前記第一部材側突片と前記第二部材側突片との回動接近を規制するストッパが設けられている（請求項１）。 In order to solve the above-described problem, the member fixing structure according to the present invention includes a first member and a second member having a plurality of fitable angular positions that can be fitted to each other around a common axis. The first member includes a first member-side projecting piece having a regular attachment surface, a back surface thereof, and a through hole from the regular attachment surface to the back surface, and the second member is a regular attachment surface; A second member-side projecting piece having the back surface and a through hole from the regular attachment surface to the back surface is provided. Then, the first member and the second member are inserted through the two through holes in a state where the regular mounting surfaces face each other from any of the plurality of fitting-possible angular positions. The one-member-side projecting piece and the second-member-side projecting piece can be rotated relative to each other about the common axis up to a normal fixed angle position where the one-member-side projecting piece is connected to each other. Furthermore, the first member-side projecting piece so that at least one of the first member and the second member can insert a screw into the two through holes in an erroneous state in which the back surfaces face each other. A stopper for restricting the rotation approach with the second member side protruding piece is provided (Claim 1).

本発明によれば、前記第一部材と前記第二部材とを結合・固定させるに当たって、前記複数の嵌合可能角度位置からその作業時の都合の良いいずれかを選んで、前記第一部材と前記第二部材とを互いに嵌合させることができる。嵌合可能角度位置が複数あるので、嵌合作業の自由度が大きく、作業性が良い。嵌合させた後、前記第一部材と前記第二部材とを相対回動させて、前記正規の固定角度位置へと移行させる。そして、該正規の固定角度位置で、対面する前記正取付面同士の二つの前記貫通孔にねじを挿通して、前記第一部材側突片と前記第二部材側突片とを互いに連結する。 According to the present invention, when the first member and the second member are coupled and fixed, the first member is selected from any of the plurality of fitting-possible angular positions, which is convenient for the operation. The second member can be fitted to each other. Since there are a plurality of fitting-possible angular positions, the degree of freedom of fitting work is great and workability is good. After the fitting, the first member and the second member are rotated relative to each other to shift to the regular fixed angle position. Then, at the regular fixed angle position, a screw is inserted through the two through-holes of the positive mounting surfaces facing each other to connect the first member side protruding piece and the second member side protruding piece to each other. .

嵌合後の前記第一部材と前記第二部材との回動方向を、前記正規の固定角度位置に至る場合の回動方向とは逆にしてしまった場合には、前記ストッパが作用する。その結果、前記裏面同士を対面させた誤った状態で二つの前記貫通孔にねじを挿通し得るほどには、前記第一部材側突片と前記第二部材側突片とが回動接近することが規制される。よって、前記正規の固定角度位置以外の誤った角度位置で前記第一部材側突片と前記第二部材側突片とが連結されてしまうことが防止される。 The stopper acts when the rotation direction of the first member and the second member after fitting is reversed from the rotation direction when reaching the regular fixed angle position. As a result, the first member-side projecting piece and the second member-side projecting piece are rotated and approached so that screws can be inserted into the two through-holes in an erroneous state in which the back surfaces face each other. Is regulated. Therefore, it is possible to prevent the first member-side protruding piece and the second member-side protruding piece from being connected at an erroneous angular position other than the regular fixed angular position.

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中のカバーを別の方向（上方）から示した斜視図、図５は、図４のカバーの裏面図（下面図）、図６は、図３中のギアケースの裏面図（下面図）、図７は、図６のギアケースに図５のカバーを嵌合させた状態の裏面図、図８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９は、図８のＩＸ−ＩＸ矢視拡大断面図、図１０は、正規の固定状態を示す、図８の一部切欠図、図１１は、誤った固定状態を示す一部切欠裏面図、図１２は、ストッパの作用を示す裏面図、図１３は、他の実施の形態を示すギアケースの裏面図である。 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 perspective view showing the cover in FIG. 3 from another direction (upward), FIG. 5 is a back view (bottom view) of the cover of FIG. 3 is a rear view (bottom view) of the gear case in FIG. 3, FIG. 7 is a rear view of the gear case of FIG. 6 fitted with the cover of FIG. 5, and FIG. FIG. 9 is an enlarged cross-sectional view taken along the line IX-IX of FIG. 8, and FIG. 10 is a partially cutaway view of FIG. 8, showing a normal fixed state. 11 is a partially cut back view showing an erroneous fixing state, FIG. 12 is a back view showing the action of the stopper, and FIG. 13 is a back view of a gear case showing another embodiment. .

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 tightening or loosening the locking nut 20, the rotation stopper 21 is inserted into the insertion hole 22 from above, and the lower end of the rotation stopper 21 is engaged with the engagement recess 23. 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、前記筒部２６から同心に下向きに突出している。前記筒部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、前記筒部２６の軸線Ｘ方向の厚みと、前記筒部２６の周方向の長さと、を備え、いずれの外向き爪２７も、ほぼ同一の形状及び大きさに形成されている。但し、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を備えている点でのみ、他の二つとは異なっている。 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 circumferential length of the cylindrical portion 26, and the outward claws 27 have substantially the same shape and size. Is formed. However, one of the outward claws 27 differs from the other two only in that it has a concave notch 28 for avoiding contact with the detent bar 21.

図６に示すように、前記各外向き爪２７の外周面は、前記筒部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９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. 6, the outer peripheral surface of each outward claw 27 is positioned on a large-diameter virtual cylindrical surface C <b> 1 that is slightly larger than the cylindrical portion 26. Further, as shown in FIGS. 3 and 9, an inward claw 30 formed on the cover 11 slides in the circumferential direction of the cylindrical portion 26 between each outward claw 27 and the step portion 25. However, an inward nail receiving gap 29 is provided so that it can enter substantially without any gap.

なお、図６の前記ギアケース１０の構成は、図１５の前記ギアケース１０’と全く同一である。 The configuration of the gear case 10 in FIG. 6 is exactly the same as that of the gear case 10 ′ in FIG. 15.

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、図４及び図５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、周方向に等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. Yes. 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 equiangularly spaced in the circumferential direction. 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、いずれの内向き爪３０も、ほぼ同一の形状及び大きさに形成されている。但し、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を備えている点でのみ、他の二つとは異なっている。図５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 has a thickness in the direction of the axis X of the mounting hole 32 and a circumferential length of the mounting hole 32, and each inward claw 30 has substantially the same shape and size. Is formed. However, one of the inward claws 30 is different from the other two only in that it has a concave notch 33 for avoiding contact with the detent bar 21. As shown in FIG. 5, the inner peripheral surface of each inward claw 30 is located on a small-diameter virtual cylindrical surface C <b> 2 that just fits into the cylindrical portion 26 of the gear case 10.

図７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。 As shown in FIG. 7, each of the inward claws 30 has a size that can be fitted into any interval 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 have a size that can be fitted into any gap between the inward claws 30 of the cover 11.

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、前記外向き爪２７が前記内向き爪３０同士の間の間隔に嵌り込む（このとき、必然的に、前記内向き爪３０が前記外向き爪２７同士の間の間隔に嵌り込む）複数の嵌合可能角度位置（図示例では、三つの嵌合可能角度位置）で、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 are arranged so that their axis lines X coincide, that is, with the axis lines serving as the common axis line X, the outward claws 27 fit into the gaps between the inward claws 30. (In this case, the inward claws 30 are inevitably fitted into the gaps between the outward claws 27) at a plurality of fitting angle positions (in the illustrated example, three fitting angle positions). The inward claw 30 can be fitted to the set position where it abuts on the step 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８及び図９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. 8 and 9, 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６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 6, a gear for fixing the cover 11 with a screw 34 on the lower surface of the case main 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、図４及び図５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, 4, and 5, a cover-side protrusion having a shape corresponding to the gear case-side protrusion 35 is formed on the upper surface of the cover 11 at a position outside the mounting hole 32. The piece 39 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８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１０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 front mounting surfaces 36 and 40 of the gear case-side protruding piece 35 and the cover-side protruding piece 39 as 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. 10, the screw 34 is inserted into the through hole 42 of the cover side protruding piece 39, and this 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８及び図９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. 8 and 9, the outward claws 27 and the inward claws 30 overlap each other. For this reason, even if there is only one screwing point, the connection of the cover 11 to the gear case 10 is not loose at all in the direction of the common axis X or the radial direction of the cylindrical portion 26. It will be something.

前記ギアケース１０と前記カバー１１との前記嵌合可能角度位置は、本実施の形態では三つとされているが、前記外向き爪２７と前記内向き爪３０の数を変えることで、前記嵌合可能角度位置は、二つ、又は四つ以上にもすることができることは、勿論である。いずれの嵌合可能角度位置における前記セット位置（前記内向き爪３０が前記段部２５に当接するまで前記ギアケース１０に対して前記カバー１１を嵌め込んだ状態）からも、前記ギアケース１０と前記カバー１１とを、相対的に逆方向へ自由に回動させることができる。よって、いずれ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とを前記セット位置まで嵌合させた場合でも、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８及び図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。前記嵌合可能角度位置が複数存在するので、それが一つしかない場合と比べて、前記ギアケース１０に対する前記カバー１１の取付作業に自由度があり、取付作業を行い易い。 In the present embodiment, the three possible angular positions of the gear case 10 and the cover 11 are three, but the number of the outward claws 27 and the inward claws 30 can be changed to change the fit. Of course, the possible angular positions can be two, four or more. The gear case 10 and the gear case 10 from any of the settable angular positions (the state where the cover 11 is fitted to the gear case 10 until the inward claw 30 contacts the step portion 25). The cover 11 can be freely rotated in a relatively opposite direction. Therefore, even when the gear case 10 and the cover 11 are fitted to the set position at any fitting-possible angular position, the positive mounting surface of the gear case side protruding piece 35 and the cover side protruding piece 39 By rotating at least one of the gear case 10 and the cover 11 to the regular fixed angle position where the surfaces 36 and 40 are in surface contact with each other, as shown in FIGS. The piece 35 and the cover-side protruding piece 39 are correctly fixed, and the cover 11 can be correctly fixed to the gear case 10. Since there are a plurality of fitting-possible angular positions, there is a degree of freedom in attaching the cover 11 to the gear case 10 compared to the case where there is only one, and the attaching operation is easy.

ところで、図７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１１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１１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. 7, 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, but the back surfaces 37 and 41 are in close contact with each other because the angles do not coincide with each other. It does not become a state. However, as shown in FIG. 11, the screw 34 is inserted into the through-hole 42 of the cover-side protruding piece 39 even in an erroneous 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、前記裏面３７，４１同士を対面させた誤った状態で二つの前記貫通孔４２，３８にねじ３４を挿通し得るほどの前記ギアケース側突片３５と前記カバー側突片３９との回動接近を規制するストッパ４３を設けている。 Such erroneous installation work must be prevented. For this reason, in the present embodiment, the following measures are taken so that screwing work at an incorrect fixed angle position becomes impossible. That is, at least one of the gear case 10 and the cover 11 is such a gear that the screw 34 can be inserted into the two through holes 42 and 38 in a wrong state in which the back surfaces 37 and 41 face each other. A stopper 43 that restricts the rotation approach between the case-side protruding piece 35 and the cover-side protruding piece 39 is provided.

具体的には、図４に示すように、前記カバー１１の上面に、前記ストッパ４３が上向きの凸状に一体に形成されている。該ストッパ４３は、図１２に示すように、前記カバー１１を時計回り方向に回動させたときに、前記ギアケース側突片３５の前記裏面３７側に当接して、前記カバー側突片３９が誤った方向から前記ギアケース側突片３５に所定量以上接近することを防止する。ここで、前記ストッパ４３を設けたことで保証されるべき前記両突片３５，３９の離間量の最小値は、前記裏面３７，４１同士を対面させた状態では、前記カバー側突片３９の前記貫通孔４２と前記ギアケース側突片３５の前記貫通孔３８とにねじを挿通することが不可能となる離間量である。したがって、前記複数の嵌合可能角度位置のいずれからでも前記正規の固定角度位置まで前記カバー１１を回動させることができることを条件に、前記離間量は、前記最小値より大きくても良い。 Specifically, as shown in FIG. 4, the stopper 43 is integrally formed on the upper surface of the cover 11 in an upward convex shape. As shown in FIG. 12, the stopper 43 abuts against the back surface 37 side of the gear case side protruding piece 35 when the cover 11 is rotated in the clockwise direction, and the cover side protruding piece 39 Prevents the gear case side protruding piece 35 from approaching a predetermined amount or more from the wrong direction. Here, the minimum value of the distance between the projecting pieces 35 and 39 to be guaranteed by providing the stopper 43 is that the cover-side projecting piece 39 is in a state where the back surfaces 37 and 41 face each other. The distance is such that a screw cannot be inserted into the through hole 42 and the through hole 38 of the gear case side protruding piece 35. Therefore, the separation amount may be larger than the minimum value on condition that the cover 11 can be rotated from any of the plurality of fittable angular positions to the regular fixed angular position.

図１２に示すように、前記セット位置まで嵌合した後の前記ギアケース１０と前記カバー１１との回動方向を、前記正規の固定角度位置に至る場合の回動方向とは逆にしてしまった場合には、前記ストッパ４３が作用する。このため、前記裏面３７，４１同士を対面させた誤った状態で二つの前記貫通孔４２，３８にねじを挿通し得るほどは、前記ギアケース側突片３５と前記カバー側突片３９とを回動接近させることはできない。よって、前記正規の固定角度位置以外の誤った角度位置で前記ギアケース側突片３５と前記カバー側突片３９とが互いに連結されてしまうことが防止される。 As shown in FIG. 12, the rotation direction of the gear case 10 and the cover 11 after being fitted to the set position is reversed from the rotation direction when reaching the regular fixed angle position. In the event of a failure, the stopper 43 acts. For this reason, the gear case side projecting piece 35 and the cover side projecting piece 39 are connected to such an extent that screws can be inserted into the two through holes 42 and 38 with the back surfaces 37 and 41 facing each other in an erroneous state. It cannot be rotated. Therefore, it is possible to prevent the gear case side protruding piece 35 and the cover side protruding piece 39 from being connected to each other at an erroneous angular position other than the regular fixed angular position.

なお、図４の前記カバー１１と、図１４の前記カバー１１’は、それぞれの前記ストッパ４３，４３’を除けば、互いに同一の構成である。 Note that the cover 11 in FIG. 4 and the cover 11 ′ in FIG. 14 have the same configuration except for the stoppers 43 and 43 ′.

他の実施の形態として、図１３に示すように、前記ストッパ４３と同じ機能を有するストッパ４４を、前記ギアケース１０側に一体に形成することもできる。この場合も、前記カバー１１側に前記ストッパ４３を設けた場合と同様の作用効果が得られる。 As another embodiment, as shown in FIG. 13, a stopper 44 having the same function as the stopper 43 can be integrally formed on the gear case 10 side. In this case, the same effect as that obtained when the stopper 43 is provided on the cover 11 side can be obtained.

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中のカバーを別の方向から示した斜視図である。It is the perspective view which showed the cover in FIG. 3 from another direction. 図４のカバーの裏面図（下面図）である。It is a reverse view (bottom view) of the cover of FIG. 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６のギアケースに図５のカバーを嵌合させた状態の裏面図である。FIG. 7 is a rear view of the gear case of FIG. 6 with the cover of FIG. 5 fitted thereto. 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である。It is a back view of the state which rotated the cover of FIG. 7 to the regular fixed angle position. 図８のＩＸ−ＩＸ矢視拡大断面図である。It is IX-IX arrow expanded sectional view of FIG. 正規の固定状態を示す、図８の一部切欠図である。FIG. 9 is a partially cutaway view of FIG. 8 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. ストッパの作用を示す裏面図である。It is a reverse view which shows the effect | action of a stopper. 本発明の他の実施の形態を示すギアケースの裏面図である。It is a reverse view of the gear case which shows other embodiment of this invention. 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. 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 gear case from the back side. 図１５のギアケースに図１４のカバーを嵌合させた状態の裏面図である。FIG. 16 is a back view of the gear case of FIG. 15 in a state where the cover of FIG. 14 is fitted.

Explanation of symbols

１０第一部材（ギアケース）
１１第二部材（カバー）
３５第一部材側突片（ギアケース側突片）
３４ねじ
３６正取付面
３７裏面
３８貫通孔
３９第二部材側突片（カバー側突片）
４０正取付面
４１裏面
４２貫通孔
４３ストッパ
４４ストッパ
Ｘ共通軸線 10 First member (gear case)
11 Second member (cover)
35 1st member side protruding piece (gear case side protruding piece)
34 Screw 36 Positive mounting surface 37 Back surface 38 Through hole 39 Second member side protruding piece (cover side protruding piece)
40 Front mounting surface 41 Back surface 42 Through hole 43 Stopper 44 Stopper X Common axis

Claims

The first member (10) includes a first member (10) and a second member (11) having a plurality of matable angular positions that can be fitted to each other around a common axis (X), and the first member (10) is a positive mounting surface (36), a back surface (37) thereof, and a first member-side projecting piece (35) having a through hole (38) from the regular attachment surface (36) to the back surface (37), The second member (11) has 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). A projecting piece (39) is provided, and the first member (10) and the second member (11) face each other on the regular mounting surfaces (36, 40) from any one of the plurality of fitting-possible angular positions. In this state, a screw (34) is inserted into the two through holes (38, 42), and the first member side protruding piece (35) and the first The member-side projecting piece (39) can be relatively rotated around the common axis (X) to a regular fixed angle position that connects the member-side projecting pieces (39) to each other, and the first member (10) and the second member (11) ) On the side of the first member such that the screw (34) can be inserted into the two through holes (38, 42) in an erroneous state in which the back surfaces (37, 41) face each other. A member coupling structure provided with stoppers (43, 44) for restricting the rotation approach between the projecting piece (35) and the second member side projecting piece (39).

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).