JP4505369B2

JP4505369B2 - Chain pull

Info

Publication number: JP4505369B2
Application number: JP2005112993A
Authority: JP
Inventors: 敏行荻野
Original assignee: 株式会社三ケ島製作所
Priority date: 2005-04-11
Filing date: 2005-04-11
Publication date: 2010-07-21
Anticipated expiration: 2025-04-11
Also published as: JP2006292059A

Description

この発明は、自転車、自動二輪車その他の駆動装置に装着されたチェーンの張力を調整するために使用されるチェーン引に関するものである。 The present invention relates to a chain pull used for adjusting the tension of a chain mounted on a bicycle, a motorcycle or other drive devices.

チェーン引は、チェーンが巻回されるギアの軸に装着されるアジャスタにボルトを挿通し、ナット部材によってアジャスタを前後に移動させることによってチェーンの張力を調整するようにしている。
実開平５−２６７８４号 In chain pulling, a bolt is inserted into an adjuster mounted on a shaft of a gear around which the chain is wound, and the tension of the chain is adjusted by moving the adjuster back and forth with a nut member.
Japanese Utility Model Publication No. 5-26784

上記特許文献の発明は、チェーンステーの後端部に装着される座金にボルト孔を形成し、このボルト孔に先端にギアの軸が挿通する孔を有するチェーン引きボルトを装着し、このチェーン引きボルトにナットを螺合させた構成であり、ナットを回転させることによって前記チェーン引きボルトを軸方向に移動させ、ギアの軸の位置を調整するようにしてある。
特開平７−１８７０５１号 In the invention of the above patent document, a bolt hole is formed in a washer attached to the rear end portion of the chain stay, and a chain pulling bolt having a hole through which a gear shaft is inserted is attached to the bolt hole. The nut is screwed to the bolt, and the chain pulling bolt is moved in the axial direction by rotating the nut to adjust the position of the shaft of the gear.
Japanese Patent Laid-Open No. 7-187051

上記特許文献の発明は、ギアの軸が挿通されるスウイングアームに調整金具をはめ込み、この調整金具を挿通する調整ボルトの先端側を前記スウイングアームの後端部に形成したネジ孔に螺合した構成であり、前記調整ボルトを回転させることにより調整金具を軸方向に移動させ、ギアの軸の位置を調整できるようにしてある。 In the invention of the above-mentioned patent document, an adjustment fitting is fitted into a swing arm through which a gear shaft is inserted, and a tip end side of an adjustment bolt through which the adjustment fitting is inserted is screwed into a screw hole formed in a rear end portion of the swing arm. In this configuration, the adjustment fitting is rotated in the axial direction by rotating the adjustment bolt, so that the position of the gear shaft can be adjusted.

上記に示すとおり、従来のチェーン引はいずれも通常のボルトの回転によって、座金あるいは調整金具とギアの軸との距離を変化させるものであった。そのために、ボルトの移動量がそのまま座金などと軸との距離の変化量となっている。また、座金あるいは調整金具に挿通されたボルトの基部は外部に突出している。 As described above, all the conventional chain pulls change the distance between the washer or the adjustment fitting and the shaft of the gear by the normal rotation of the bolt. Therefore, the amount of movement of the bolt is the amount of change in the distance between the washer and the shaft as it is. Further, the base of the bolt inserted into the washer or the adjustment fitting protrudes to the outside.

この発明は、ボルトを所定回転させたときに得られるボルトの移動量よりも座金などと軸との距離の変化量を大きくして調整の作業効率を向上させること、そしてボルトの外部への突出を可及的に解消することを課題とするものである。 The present invention improves the working efficiency of adjustment by increasing the amount of change in the distance between the washer and the shaft and the amount of movement of the bolt obtained when the bolt is rotated by a predetermined amount, and protruding the bolt to the outside. The problem is to eliminate as much as possible.

この発明のチェーン引は、ギアの軸に装着される軸孔を有する軸受けと、前記ギアの軸が装着される基枠に当接する台座と、前記軸受けと台座との間に介在する段付きボルトで構成する。
前記基枠は、自転車の場合はチェーンステーでありそのリアエンドに軸受けは装着される。また自動二輪車の場合はスイングアームが基枠となる。
前記軸受けは、軸孔を有する基部に雌ねじ孔を有する軸部を連設して構成し、前記軸部の外径は台座の雌ねじ孔に遊嵌する寸法とする。
前記段付きボルトの大径部周壁と小径部周壁には互いに逆向きの雄ねじを形成し、大径部端面に回転用係止部を形成する。前記回転用係止部は、六角レンチ用の平面六角形の孔、ドライバー用の十字形又は−形の溝などとして構成する。
前記軸受けには雌ねじ孔を形成し、この雌ねじ孔は前記段付きボルトの小径部の雄ねじと螺合する寸法とする。また、前記台座には雌ねじ孔を貫通させて形成し、この雌ねじ孔は前記段付きボルトの大径部の雄ねじと螺合する寸法とする。
前記台座の雌ねじ孔は段付きボルトの回転操作を可能とするために貫通孔とすることが必要であるが、軸受けの雌ねじ孔は貫通させなくともよい。
前記軸受けは、実施例に示すようにリング部と雌ねじ孔を有する軸部とを一体的に構成したものの他、扁平直方体のブロックとしてその一側に軸孔を形成し、他側に雌ねじ孔を形成する構成とすることもできる。 The chain pull according to the present invention includes a bearing having a shaft hole mounted on a gear shaft, a pedestal that abuts a base frame on which the gear shaft is mounted, and a stepped bolt interposed between the bearing and the pedestal. Consists of.
The base frame is a chain stay in the case of a bicycle, and a bearing is attached to the rear end thereof. In the case of a motorcycle, the swing arm is the base frame.
The bearing is configured by connecting a shaft portion having a female screw hole to a base portion having a shaft hole, and the outer diameter of the shaft portion is a size that fits loosely in the female screw hole of the base.
The large-diameter portion peripheral wall and the small-diameter portion peripheral wall of the stepped bolt are formed with male threads opposite to each other, and a rotation locking portion is formed on the large-diameter end surface. The rotation locking portion is configured as a flat hexagonal hole for a hexagonal wrench, a cross or negative groove for a driver, and the like.
A female screw hole is formed in the bearing, and the female screw hole has a size to be engaged with a male screw of a small diameter portion of the stepped bolt. The pedestal is formed by penetrating a female screw hole, and the female screw hole is dimensioned to be screwed with a male screw of a large diameter portion of the stepped bolt.
The female screw hole of the pedestal needs to be a through hole in order to enable the rotation operation of the stepped bolt, but the female screw hole of the bearing need not be penetrated.
The bearing has a ring portion and a shaft portion having a female screw hole integrally formed as shown in the embodiment, and a shaft hole is formed on one side as a block of a flat rectangular parallelepiped, and a female screw hole is formed on the other side. It can also be set as the structure to form.

この発明のチェーン引は、段付きボルトの小径側を軸受けの雌ねじ孔に螺合し、大径側を台座の雌ねじ孔に螺合して３つの部材を一体化し、前記軸受けの軸孔をギアの軸に装着すると共に、台座を自転車のチェーンステーのリアエンド等の基枠に当接させ、回転しないように保持する。
軸受けと台座とはネジの向きが逆であるから、ネジを回転させると軸受けと台座は互いに近づく方向に、又は互いに離反する方向にそれぞれ移動する。その結果、ネジの回転を効率よく軸受けと台座の距離の移動に変換することができ、チェーンの張力の調整作業が効率化する。
また、この発明によれば上記の通りネジの移動量よりも軸受けと台座の距離の変化量が大きくなるので、従来の構造よりもボルトが短くて足りる。その結果、ネジの台座からの突出を可及的に小さくすることができる。
そして、軸受けの一部が台座に収納されるので、小型化される。 In the chain pulling of the present invention, the small diameter side of the stepped bolt is screwed into the female screw hole of the bearing, the large diameter side is screwed into the female screw hole of the pedestal, and the three members are integrated, and the shaft hole of the bearing is connected to the gear. The base is brought into contact with a base frame such as a rear end of a bicycle chain stay and held so as not to rotate.
Since the bearing and the pedestal have opposite screw directions, when the screw is rotated, the bearing and the pedestal move in a direction toward each other or in a direction away from each other. As a result, the rotation of the screw can be efficiently converted into movement of the distance between the bearing and the pedestal, and the work of adjusting the chain tension becomes efficient.
Further, according to the present invention, since the amount of change in the distance between the bearing and the pedestal becomes larger than the amount of movement of the screw as described above, the bolt is shorter than the conventional structure. As a result, the protrusion of the screw from the pedestal can be made as small as possible.
And since a part of bearing is accommodated in a base, it is reduced in size.

以下実施例を説明する。 Examples will be described below.

軸受け１と、台座２と、前記軸受け１と台座２との間に介在する段付きボルト３でチェーン引が構成してある。
前記軸受け１は、その基部４にチェーンが巻回されるギアが装着される自転車の後輪車軸に装着される軸孔５を有し、基部４の一側に軸部６が一体的に形成してあり、前記軸部６には雌ねじ孔７が形成してある。
前記台座２は、その中央部に貫通した雌ねじ孔８を有し、この雌ねじ孔８の両側裏面に自転車のチェーンステーのリアエンドＡに係止する凹部９が形成してある。また表面には前記雌ねじ孔８の延長として環状壁１０が形成してある。
前記段付きボルト３は、小径部１１は大径部１２の５倍程度の長さであって、大径部周壁に左ネジ（逆ネジ）が、小径部周壁に右ネジ（正ネジ）が形成してある。そして、前記軸受け１の雌ねじ孔７は前記小径部の右ネジと、台座２の雌ねじ孔８は大径部の左ネジと、それぞれ螺合する寸法としてある。また、大径部１２の端面には六角レンチが係合する係止穴１５が設けてある。
上記において、前記軸受け１の軸部６の外径は前記台座２の雌ねじ孔８に遊嵌する寸法としてあり、段付きボルト３の全長は、軸受け１の雌ねじ孔７と台座２の雌ねじ孔８（環状壁１０部分を含む）の長さの和よりも短くしてある。 A chain pull is constituted by a bearing 1, a base 2, and a stepped bolt 3 interposed between the bearing 1 and the base 2.
The bearing 1 has a shaft hole 5 to be attached to a rear wheel axle of a bicycle to which a gear around which a chain is wound is attached to a base portion 4, and a shaft portion 6 is integrally formed on one side of the base portion 4. The shaft portion 6 has a female screw hole 7 formed therein.
The pedestal 2 has a female screw hole 8 penetrating in the center thereof, and recesses 9 that are engaged with the rear end A of the chain stay of the bicycle are formed on both side back surfaces of the female screw hole 8. An annular wall 10 is formed on the surface as an extension of the female screw hole 8.
In the stepped bolt 3, the small diameter portion 11 is about five times as long as the large diameter portion 12, and a left screw (reverse screw) is provided on the peripheral wall of the large diameter portion, and a right screw (normal screw) is provided on the peripheral wall of the small diameter portion. It is formed. The female screw hole 7 of the bearing 1 is dimensioned to be screwed with the right-hand screw of the small-diameter portion, and the female screw hole 8 of the base 2 is screwed with the left-hand screw of the large-diameter portion. Further, the end face of the large diameter portion 12 is provided with a locking hole 15 with which a hexagon wrench is engaged.
In the above description, the outer diameter of the shaft portion 6 of the bearing 1 is dimensioned to fit loosely into the female screw hole 8 of the pedestal 2, and the total length of the stepped bolt 3 is the female screw hole 7 of the bearing 1 and the female screw hole 8 of the pedestal 2. It is shorter than the sum of the lengths (including the annular wall 10 portion).

この実施例のチェーン引は、図３に示すように、段付きボルト３の小径部１１を軸受け１の雌ねじ孔７の端部までねじ込み、大径部１２を台座２の雌ねじ孔８の端部から僅かに（１ミリ程度）突出する程度までねじ込んで、自転車に装着する。
自転車に装着した状態において、軸受け１は後輪車軸によって回転が規制され、台座２はリアエンドＡによって回転が規制される。そこで、段付きボルト３の係止穴１５に六角レンチを係止させて、段付きボルト３を左方向（反時計回り）に回転させると、軸受け１と台座２に離反方向の移動が発生するので、軸受け１は前進する。
このとき、段付きボルト３の小径部１１は軸受け１の雌ねじ孔７から抜ける方向に移動し、大径部１２は台座２の雌ねじ孔８から抜ける方向に移動するので、段付きボルトが台座２の表側に突出することはない。また、軸受け１と台座２とがそれぞれ離反方向に移動するので、ボルトの回転によって得られる移動量が倍増する。 As shown in FIG. 3, in this embodiment, the small diameter portion 11 of the stepped bolt 3 is screwed to the end of the female screw hole 7 of the bearing 1, and the large diameter portion 12 is the end of the female screw hole 8 of the base 2. Screw it to the extent that it protrudes slightly (about 1 mm) and attach it to the bicycle.
In the state where the bicycle 1 is mounted on the bicycle, the rotation of the bearing 1 is restricted by the rear wheel axle, and the rotation of the base 2 is restricted by the rear end A. Therefore, when the hexagon wrench is locked in the locking hole 15 of the stepped bolt 3 and the stepped bolt 3 is rotated in the left direction (counterclockwise), the bearing 1 and the pedestal 2 are moved away from each other. Therefore, the bearing 1 moves forward.
At this time, the small-diameter portion 11 of the stepped bolt 3 moves in the direction of coming out of the female screw hole 7 of the bearing 1, and the large-diameter portion 12 moves in the direction of coming out of the female screw hole 8 of the pedestal 2. It does not protrude to the front side. Moreover, since the bearing 1 and the base 2 each move away from each other, the amount of movement obtained by the rotation of the bolt is doubled.

この発明によれば、ボルトの回転によって軸受けと台座とが反対方向に移動するので、ボルトの回転により得られる移動量が大きく、チェーンの張力調整作業の作業効率が向上するものであり、産業上の利用可能性を有するものである。 According to the present invention, since the bearing and the pedestal move in the opposite directions by the rotation of the bolt, the amount of movement obtained by the rotation of the bolt is large, and the work efficiency of the chain tension adjustment work is improved. It has the availability of.

この発明実施例の分解斜視図Exploded perspective view of the embodiment of the present invention 同じく斜視図Same perspective view 同じく初期状態の正面図Similarly, the front view of the initial state 同じく前進状態の正面図The front view of the forward state 同じく右側面図Same right side view 同じく使用状態の正面図Similarly front view of usage

Explanation of symbols

１軸受け
２台座
３段付きボルト
４基部
５軸孔
６軸部
７雌ねじ孔
８雌ねじ孔
９凹部
１０環状壁
１１小径部
１２大径部
１５係止穴 DESCRIPTION OF SYMBOLS 1 Bearing 2 Base 3 Stepped bolt 4 Base part 5 Shaft hole 6 Shaft part 7 Female screw hole 8 Female screw hole 9 Recessed part 10 Annular wall 11 Small diameter part 12 Large diameter part 15 Locking hole

Claims

A chain pull for adjusting the tension of the chain by moving the position of the shaft of the gear around which the chain is wound,
A bearing having a shaft hole to be mounted on the shaft of the gear, a pedestal that contacts a base frame to which the shaft of the gear is mounted, and a stepped bolt interposed between the bearing and the pedestal;
The bearing is configured by connecting a shaft portion having a female screw hole to a base portion having a shaft hole, and the outer diameter of the shaft portion is a size that is loosely fitted in the female screw hole of the base,
The large-diameter peripheral wall and the small-diameter peripheral wall of the stepped bolt are formed with mutually opposite male threads, and the large-diameter end face is formed with a locking part for rotation.
A female screw hole is formed in the bearing, and the female screw hole has a size to be screwed with a male screw of a small diameter portion of the stepped bolt,
A female screw hole is formed through the base, and the female screw hole is dimensioned to be screwed with a male screw of a large diameter portion of the stepped bolt.
Chain pull