JP2021079717A

JP2021079717A - Drive assist device

Info

Publication number: JP2021079717A
Application number: JP2019205974A
Authority: JP
Inventors: 悦進阿久津; Nobuyuki Akutsu
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-11-14
Filing date: 2019-11-14
Publication date: 2021-05-27

Abstract

To provide a compact drive assist device which has a simple structure with a small number of parts, and which is capable of sufficiently assist drive force at low costs.SOLUTION: According to a drive assist device that is made attachable to a bicycle or the like, first chains 10a and 10b are tensioned by first gears 4a and 4b that have attachment holes, which are rotated together with cranks 5a and 5b, not offset from the center, and pedals 6a and 6b which rotate one sides by half which are the most apart from the center of the attachment holes offset from the centers of second gears 9a and 9b are operated by equal to or greater than a half turn. Hence, the operating speed of the pedals 6a and 6b are accelerated, and the rotation speed of a chain gear 13 acting on the external side at the other side closest to the center of the chain gear 13 is also accelerated. Therefore, the operating speed of the pedals 6a and 6b is further accelerated, and thus the load on feet operating the pedals 6a and 6b is reduced, accomplishing a sufficient drive assist.SELECTED DRAWING: Figure 1

Description

本発明は、自転車等の駆動を有効に補助できる駆動補助装置に関する。 The present invention relates to a drive assist device that can effectively assist the drive of a bicycle or the like.

自転車の走行時において、搭乗者の足の負担を軽減させるため駆動力を増大させるとともに後輪に作用させることができる。特許文献１に従来の駆動補助装置の１例が記載されている。 When the bicycle is running, the driving force can be increased and the rear wheels can be acted on in order to reduce the burden on the passenger's feet. Patent Document 1 describes an example of a conventional drive assisting device.

特許第５５７１４２０号公報Japanese Patent No. 5571420

上述した特許文献１に係る駆動補助装置は、自転車の駆動力を増大させて後輪に作用させるものである。その一形態では、構造上、第２板状の棒を回転させる移動回転軸は、回転している場合は常に回転に伴って往復移動しながら第２回転軸を回転させていることで、一時的に、てこ作用が生じる箇所の駆動力が増大する距離は短いものであった。本発明は、このような問題点を解決すべくなされたもので、その技術的課題は、構造が簡単で部品点数が少なく、低コストでペダルを漕ぐ足の負担を軽減させることができる駆動補助装置を提供することにある。 The drive assisting device according to Patent Document 1 described above increases the driving force of the bicycle and causes it to act on the rear wheels. In one form, structurally, the moving rotation shaft that rotates the second plate-shaped rod is temporarily rotated by rotating the second rotation shaft while reciprocating along with the rotation when it is rotating. Therefore, the distance at which the driving force at the place where the lever action occurs increases is short. The present invention has been made to solve such a problem, and its technical problem is a drive assist that has a simple structure, a small number of parts, and can reduce the burden on the pedaling foot at low cost. To provide the equipment.

上記技術的課題を解決するために、本発明の一形態は、自転車等に取り付け可能にするフレームの前方側に取り付け固定されたクランク軸受けと、前記クランク軸受けに回転可能に取り付けられたクランク軸と、前記クランク軸の内側の一端に取り付け固定された第１のギアと、前記クランク軸の外側の他端に取り付けられたクランクと、前記クランクの先端に取り付けられたペダルと、前記フレームの中間の箇所に取り付けられたピンと、前記ピンに回転可能に取り付けられた取り付け穴が中心から偏芯している第３のギアと、前記フレームの後方側に取り付け固定された回転軸受けと、前記回転軸受けに回転可能に取り付けられた回転軸と、前記回転軸に取り付け固定された取り付け穴が中心から偏芯している第２のギアと、前記第１のギア及び前記第２のギアに架け渡され、前記第３のギアに係る第１のチェーンと、前記回転軸には前記第２のギア及びこれと対抗して取り付け固定されたチェーンギア、とを備えたことを特徴とするものである。
また、自転車等に取り付け可能にするフレームの前方側に取り付け固定されたクランク軸受けと、前記クランク軸受けに回転可能に取り付けられたクランク軸と、前記クランク軸の内側の一端に取り付け固定された取り付け穴が中心から偏芯している第２のギアと、前記クランク軸の外側の他端に取り付けられたクランクと、前記クランクの先端に取り付けられたペダルと、前記フレームの中間の箇所に取り付けられたピンと、前記ピンに回転可能に取り付けられた取り付け穴が中心から偏芯している第３のギアと、前記フレームの後方側に取り付け固定された回転軸受けと、前記回転軸受けに回転可能に取り付けられた回転軸と、前記回転軸に取り付け固定された第１のギアと、前記第２のギア及び前記第１のギアに架け渡され、前記第３のギアに係る第１のチェーンと、前記回転軸には前記第１のギア及びこれと対抗して取り付け固定されたチェーンギア、とを備えたことを特徴とするものである。 In order to solve the above technical problems, one embodiment of the present invention includes a crankshaft that is attached and fixed to the front side of a frame that can be attached to a bicycle or the like, and a crankshaft that is rotatably attached to the crankshaft. , The first gear attached and fixed to one end inside the crankshaft, the crank attached to the other end outside the crankshaft, the pedal attached to the tip of the crank, and the middle of the frame. To the pin mounted at the location, the third gear in which the mounting hole rotatably attached to the pin is eccentric from the center, the rotary bearing mounted and fixed to the rear side of the frame, and the rotary bearing. A rotary shaft rotatably mounted, a second gear in which a mounting hole mounted and fixed to the rotary shaft is eccentric from the center, and the first gear and the second gear are bridged. It is characterized in that a first chain related to the third gear and a chain gear attached and fixed to the second gear and a chain gear attached and fixed in opposition to the second gear are provided on the rotating shaft.
Further, a crankshaft that is mounted and fixed on the front side of a frame that can be mounted on a bicycle or the like, a crankshaft that is rotatably mounted on the crankshaft, and a mounting hole that is mounted and fixed on one inner end of the crankshaft. Was attached to a second gear eccentric from the center, a crank attached to the outer other end of the crankshaft, a pedal attached to the tip of the crank, and an intermediate portion of the frame. A pin, a third gear in which a mounting hole rotatably attached to the pin is eccentric from the center, a rotary bearing mounted and fixed to the rear side of the frame, and a rotary bearing rotatably attached to the rotary bearing. A rotary shaft, a first gear attached and fixed to the rotary shaft, a first chain bridged to the second gear and the first gear, and a first chain related to the third gear, and the rotation. The shaft is provided with the first gear and a chain gear attached and fixed in opposition to the first gear.

本発明によれば、上記構成により構造が簡単で部品点数が少なく、低コストで駆動力の補助を十分に行うことができる小型の駆動補助装置を提供することが可能になる。
上記した以外の課題、構成及び効果は以下の実施形態の説明により明らかにされる。 According to the present invention, it is possible to provide a small drive assisting device having a simple structure, a small number of parts, and capable of sufficiently assisting a driving force at a low cost by the above configuration.
Issues, configurations and effects other than those described above will be clarified by the following description of the embodiments.

本発明の駆動補助装置の概略構成を示す斜視図Perspective view which shows the schematic structure of the drive assist device of this invention. 図１に示す同駆動補助装置の概略構成を示す様子を上から見た図A view showing the schematic configuration of the drive assisting device shown in FIG. 1 from above. 図１に示す同駆動補助装置の木の葉型をしたチェーンギアの尖った箇所にチェーンのピンがある様子を示した図The figure which showed the state which the pin of the chain is at the sharp part of the chain gear which was shaped like a leaf of the drive auxiliary device shown in FIG. 図１に示す同駆動補助装置の構成動作を簡略して側面から見た図A side view of the configuration operation of the drive assist device shown in FIG. 1 in a simplified manner. 図１に示す同駆動補助装置を自転車に実施した例を示す側面図A side view showing an example in which the same drive assist device shown in FIG. 1 is applied to a bicycle. 図１に示す同駆動補助装置の他の実施例を示す図The figure which shows the other embodiment of the drive auxiliary apparatus shown in FIG.

以下本発明の駆動補助装置について実施例を上げ、図面を参照して詳細に説明する。図１は、本発明の駆動補助装置の概略構成を示す斜視図である。図２は、図１に示す同駆動補助装置の概略構成を示す様子を上から見た図である。
図１、図２を参照すれば、自転車等に取り付け可能にするフレーム１の前方側に、クランク軸受け２ａ、２ｂが取り付け固定される。クランク軸受け２ａ、２ｂに、クランク軸３ａ、３ｂが回転可能に取り付けられ、クランク軸３ａ、３ｂの内側の一端には第１のギア４ａ、４ｂが取り付け固定される。クランク軸３ａ、３ｂの外側の他端にクランク５ａ、５ｂが取り付けられ、クランク５ａ、５ｂの先端にペダル６ａ、６ｂが取り付けられる。フレーム１の中間の箇所にピン１１ａ、１１ｂが取り付けられ、ピン１１ａ、１１ｂに取り付け穴が中心から偏芯している第３のギア１２ａ、１２ｂが回転可能に取り付けられる。フレーム１の後方側に回転軸受け７ａ、７ｂが取り付け固定され、回転軸受け７ａ、７ｂに回転軸８が回転可能に取り付けられる。回転軸８に、取り付け穴が中心から偏芯している第２のギア９ａ、９ｂが取り付け固定される。第１のギア４ａ、４ｂ及び第２のギア９ａ、９ｂに第１のチェーン１０ａ、１０ｂが架け渡され、第３のギア１２ａ、１２ｂに第１のチェーン１０ａ、１０ｂが掛かる。回転軸８には、第２のギア９ａ、９ｂ及びこれと対向してチェーンギア１３が取り付け固定され、チェーンギア１３が外部に作用する。 Hereinafter, the drive assist device of the present invention will be described in detail with reference to the drawings with reference to examples. FIG. 1 is a perspective view showing a schematic configuration of a drive assisting device of the present invention. FIG. 2 is a top view showing a schematic configuration of the drive assisting device shown in FIG.
With reference to FIGS. 1 and 2, the crank bearings 2a and 2b are attached and fixed to the front side of the frame 1 which can be attached to a bicycle or the like. The crankshafts 3a and 3b are rotatably attached to the crank bearings 2a and 2b, and the first gears 4a and 4b are attached and fixed to one end inside the crankshafts 3a and 3b. Cranks 5a and 5b are attached to the outer other ends of the crankshafts 3a and 3b, and pedals 6a and 6b are attached to the tips of the cranks 5a and 5b. Pins 11a and 11b are attached to the middle portion of the frame 1, and third gears 12a and 12b whose attachment holes are eccentric from the center are rotatably attached to the pins 11a and 11b. Rotating bearings 7a and 7b are attached and fixed to the rear side of the frame 1, and the rotating shaft 8 is rotatably attached to the rotating bearings 7a and 7b. Second gears 9a and 9b whose mounting holes are eccentric from the center are mounted and fixed to the rotating shaft 8. The first chains 10a and 10b are bridged to the first gears 4a and 4b and the second gears 9a and 9b, and the first chains 10a and 10b are hooked on the third gears 12a and 12b. The second gears 9a and 9b and the chain gear 13 facing the second gears 9a and 9b are attached and fixed to the rotating shaft 8, and the chain gear 13 acts on the outside.

因みに、第３のギア１２ａ、１２ｂは楕円形をしており、取り付け穴が中心から偏心している。
図３は、図１に示す駆動補助装置の木の葉型をしたチェーンギアの尖った箇所に第２のチェーンのピンがあることを簡略して示した図である。図３を参照すれば、チェーンギア１３は丸括弧と丸括弧を閉じ合わせた変形をしている木の葉型をしており、チェーンギア１３に、第２のチェーン１５を掛けた場合に、第２のチェーン１５のピンがチェーンギア１３の中心から最長の尖った箇所に掛かるようにチェーンギアの歯が配列されている。因みに、木の葉型をしたチェーンギア１３は丸括弧と丸括弧を閉じ重ね合わせた形状になっていることで中心から最短の箇所までの距離と同じ距離になっている楕円チェーンギアの中心から最長の箇所とこの前後よりも内側にすぼむため、ギアに第２のチェーン１５を掛けた第２のチェーン１５のピンの中心からチェーンギア１３の中心までの距離をやや短くすることができる。さらに、木の葉型をしているチェーンギア１３も尖っている最長の箇所とこの前後ではペダル６ａ、６ｂを漕ぐ速度は遅くなるが、図４ー−Ａに示すようにペダル６ａ、６ｂの漕ぎ出しは頂点の後方となる位置Ａからと、ペダル６ａ、６ｂを漕ぐ距離が長くなることでいくらかペダル６ａ、６ｂを漕ぐ速度は速くなり、ペダル６ａ、６ｂを漕ぐ速度が早くなる箇所は更に早くなることになる。この結果、ペダル６ａ、６ｂを漕ぐ負担を少なくして十分に駆動補助することができる。 Incidentally, the third gears 12a and 12b have an elliptical shape, and the mounting holes are eccentric from the center.
FIG. 3 is a simplified view showing that the pin of the second chain is located at a pointed portion of the leaf-shaped chain gear of the drive assist device shown in FIG. Referring to FIG. 3, the chain gear 13 has a leaf shape that is deformed by closing parentheses and parentheses, and when the second chain 15 is hung on the chain gear 13, the second chain is second. The teeth of the chain gear are arranged so that the pins of the chain 15 of the chain 15 hang on the longest pointed portion from the center of the chain gear 13. By the way, the leaf-shaped chain gear 13 is the longest from the center of the elliptical chain gear, which is the same distance from the center to the shortest point because it has a shape in which the circle brackets and the circle brackets are closed and overlapped. The distance from the center of the pin of the second chain 15 to which the second chain 15 is hung on the gear to the center of the chain gear 13 can be slightly shortened because the portion and the front and rear are recessed inward. Furthermore, the pedaling speed of pedals 6a and 6b slows down at the longest point where the leaf-shaped chain gear 13 is sharp and before and after this, but as shown in FIG. 4-A, pedals 6a and 6b are started. From the position A behind the apex, the pedaling distance of the pedals 6a and 6b becomes longer, so that the pedaling speed of the pedals 6a and 6b becomes somewhat faster, and the pedaling speed of the pedals 6a and 6b becomes faster. It will be. As a result, the burden of pedaling the pedals 6a and 6b can be reduced, and the drive can be sufficiently assisted.

図４−Ａから図４−Ｄは、図１で説明した駆動補助装置の構成動作を側面から見た簡略図である。図４−Ａから図４−Ｄを参照すれば、ここではペダル６ａ，６ｂを反時計回りに漕ぐ場合を想定している。図４−Ａに示すように、位置Ａでは、ペダル６ａは頂点の後方にあり、第２のギア９ａは、回転軸８の軸心から最長の箇所が頂点から２７０度の位置となり、第３のギア１２ａはピン１１ａの軸心から最短の箇所に、第１のチェーン１０ａが張っている状態で掛かっており、チェーンギア１３は中心から最長の箇所が頂点と最下点の位置になっている。また、図４−Ｂに示すように、位置Ｂではペダル６ａは頂点から９０度の位置にあり、第２のギア９ａは、回転軸８の軸心から最長の箇所が頂点の位置となり、最短の箇所は最下点の位置となっている。第３のギア１２ａはピン１１ａの軸心から最長と最短の箇所から右片側の中間の箇所に第１のチェーン１０ａが張っている状態で掛かっており、チェーンギア１３は中心から最短の箇所が頂点と最下点の位置になっている。また、図４−Ｃに示すように、位置Ｃでは、ペダル６ａは最下点から後方にあり、第２のギア９ａは回転軸８の軸心から最長の箇所が頂点から９０度の位置となり、第３のギア１２ａはピン１１ａの軸心から最長の箇所に、第１のチェーン１０ａが張っている状態で掛かっており、チェーンギア１３は中心から最長の箇所が頂点と最下点の位置になっている。また、図４−Ｄに示すように、位置Ｄでは、ペダル６ａは頂点から２７０度の位置にあり、第２のギア９ａは回転軸８の軸心から最長の箇所が頂点から１８０度の位置となり、最短の箇所は頂点の位置になっている。第３のギア１２ａはピン１１ａの軸心から最長と最短の箇所から左片側の中間の箇所に、第１のチェーン１０ａが張っている状態で掛かっており、チェーンギア１３は中心から最短の箇所が頂点と最下点の位置になっている。即ち、駆動補助装置では、図４−Ａから図４−Ｄに示されるように、ペダル６ａを漕いで、第２のギア１０ａの中心から偏心している取り付け穴の中心から最長になる片側を半回転させるペダル６ａは位置Ａから位置Ｃまでペダル６ａを半回転以上長く漕ぐためになるためペダル６ａを漕ぐ速度は速くなり、チェーンギア１３は中心から最短の箇所とこの前後で、外部に作用させる回転速度は速くなることで、ペダル６ａを漕ぐ速度は更に速くなるため、ペダル６ａを漕ぐ足の負担を少なくして十分に駆動補助ができる。 4-A to 4-D are simplified views of the configuration operation of the drive assist device described with reference to FIG. 1 as viewed from the side. With reference to FIGS. 4-A to 4-D, it is assumed here that the pedals 6a and 6b are pedaled counterclockwise. As shown in FIG. 4-A, at position A, the pedal 6a is behind the apex, and the second gear 9a has the longest point from the axis of the rotating shaft 8 at a position of 270 degrees from the apex. The gear 12a is hung at the shortest point from the axis of the pin 11a with the first chain 10a stretched, and the chain gear 13 has the longest point from the center at the apex and the lowest point. There is. Further, as shown in FIG. 4-B, at position B, the pedal 6a is located at a position 90 degrees from the apex, and the second gear 9a has the longest position from the axis of the rotating shaft 8 as the apex position, which is the shortest. Is the position of the lowest point. The third gear 12a is hung with the first chain 10a stretched from the longest and shortest points from the axis of the pin 11a to the middle part on the right one side, and the chain gear 13 has the shortest point from the center. It is the position of the apex and the lowest point. Further, as shown in FIG. 4-C, at position C, the pedal 6a is located rearward from the lowest point, and the second gear 9a is located 90 degrees from the apex at the longest point from the axis of the rotating shaft 8. , The third gear 12a is hung at the longest point from the axis of the pin 11a with the first chain 10a stretched, and the chain gear 13 is at the position of the apex and the lowest point at the longest point from the center. It has become. Further, as shown in FIG. 4-D, at position D, the pedal 6a is located at a position of 270 degrees from the apex, and the second gear 9a is located at a position 180 degrees from the apex at the longest point from the axis of the rotating shaft 8. The shortest point is the position of the apex. The third gear 12a is hung from the longest and shortest points from the axis of the pin 11a to the middle part on the left one side with the first chain 10a stretched, and the chain gear 13 is the shortest place from the center. Is the position of the apex and the lowest point. That is, in the drive assist device, as shown in FIGS. 4-A to 4-D, one side that is the longest from the center of the mounting hole that is eccentric from the center of the second gear 10a is halved by pedaling the pedal 6a. Since the pedal 6a to be rotated is for pedaling the pedal 6a from position A to position C for more than half a rotation, the pedaling speed is increased, and the chain gear 13 is rotated to act on the outside at the shortest point from the center and before and after this. As the speed increases, the speed at which the pedal 6a is pedaled becomes even faster, so that the burden on the foot pedaling the pedal 6a can be reduced and sufficient drive assistance can be provided.

図５は、図１に示した駆動補助装置を自転車に実施した例を示す側面図である。図５を参照すれば、駆動補助装置を自転車に取り付けて、チェーンギア１３及び外部の変速機ギア１４に第２のチェーン１５が架け渡され、ペダル６ａ，６ｂを漕いで、クランク軸３ａ、３ｂの回転が後輪に伝達されて、自転車が走行可能になる。いずれにせよ、駆動補助装置を取り付けた自転車では、図４−Ａから図４−Ｄを参照して説明したように作用させると、ペダル６ａ、６ｂを漕ぐ負担を少なくして十分に駆動補助ができる。 FIG. 5 is a side view showing an example in which the drive assist device shown in FIG. 1 is implemented on a bicycle. Referring to FIG. 5, the drive assist device is attached to the bicycle, the second chain 15 is bridged to the chain gear 13 and the external transmission gear 14, and the pedals 6a and 6b are rowed to pedal the crankshafts 3a and 3b. The rotation of the bicycle is transmitted to the rear wheels, and the bicycle can run. In any case, in a bicycle equipped with a drive assist device, when the operation is performed as described with reference to FIGS. 4-A to 4-D, the burden of pedaling the pedals 6a and 6b is reduced and the drive assist is sufficiently provided. it can.

図６は、図１に示した駆動補助装置の他の実施例である。図６を参照すれば、駆動補助装置を自転車等に取り付け可能にするフレーム１の前方側に、クランク軸受け２ａ、２ｂが取り付け固定される。クランク軸受け２ａ、２ｂに、クランク軸３ａ、３ｂが回転可能に取り付けられ、クランク軸３ａ、３ｂの内側の一端に取り付け穴が中心から偏心している第２のギア９ａ、９ｂが取り付け固定される。クランク軸３ａ、３ｂの外側の他端にクランク５ａ、５ｂが取り付けられ、クランク５ａ、５ｂの先端にペダル６ａ、６ｂが取り付けられる。フレーム１の中間の箇所にピン１１ａ、１１ｂが取り付けられ、ピン１１ａ、１１ｂに取り付け穴が中心から偏芯している第３のギア１２ａ、１２ｂが回転可能に取り付けられる。フレーム１の後方側に回転軸受け７ａ、７ｂが取り付け固定され、回転軸受け７ａ、７ｂに回転軸８が回転可能に取り付けられる。回転軸８に、第１のギア４ａ、４ｂが取り付け固定される。第２のギア９ａ、９ｂ及び第１のギア４ａ、４ｂに第１のチェーン１０ａ、１０ｂが架け渡され、第３のギア１２ａ、１２ｂに第１のチェーン１０ａ、１０ｂが掛かる。回転軸８には、第１のギア４ａ、４ｂ及びこれと対向してチェーンギア１３が取り付け固定され、チェーンギア１３が外部に作用する。 FIG. 6 is another embodiment of the drive assist device shown in FIG. With reference to FIG. 6, the crank bearings 2a and 2b are attached and fixed to the front side of the frame 1 that enables the drive assisting device to be attached to a bicycle or the like. The crankshafts 3a and 3b are rotatably attached to the crank bearings 2a and 2b, and the second gears 9a and 9b whose mounting holes are eccentric from the center are attached and fixed to one end inside the crankshafts 3a and 3b. Cranks 5a and 5b are attached to the outer other ends of the crankshafts 3a and 3b, and pedals 6a and 6b are attached to the tips of the cranks 5a and 5b. Pins 11a and 11b are attached to the middle portion of the frame 1, and third gears 12a and 12b whose attachment holes are eccentric from the center are rotatably attached to the pins 11a and 11b. Rotating bearings 7a and 7b are attached and fixed to the rear side of the frame 1, and the rotating shaft 8 is rotatably attached to the rotating bearings 7a and 7b. The first gears 4a and 4b are attached and fixed to the rotating shaft 8. The first chains 10a and 10b are bridged to the second gears 9a and 9b and the first gears 4a and 4b, and the first chains 10a and 10b are hooked on the third gears 12a and 12b. The first gears 4a and 4b and the chain gear 13 facing the first gears 4a and 4b are attached and fixed to the rotating shaft 8, and the chain gear 13 acts on the outside.

以上、本発明の実施形態を説明したが、本発明はその趣旨を逸脱しない範囲で、種々の設計変更を行うことが可能である。例えば、自転車以外であれば、足漕ぎボートや遊園地などで使用されている足漕ぎ遊具等に利用することが出来る。 Although the embodiments of the present invention have been described above, the present invention can make various design changes without departing from the spirit of the present invention. For example, other than bicycles, it can be used for pedalo boats, pedalo play equipment used in amusement parks, and the like.

１フレーム
２ａ、２ｂクランク軸受け
３ａ、３ｂクランク軸
４ａ、４ｂ第１のギア
５ａ、５ｂクランク
６ａ、６ｂペダル
７ａ、７ｂ回転軸受け
８回転軸
９ａ、９ｂ第２のギア
１０ａ、１０ｂ第１のチェーン
１１ａ、１１ｂピン
１２ａ、１２ｂ第３のギア
１３チェーンギア
１４変速機ギア
１５第２のチェーン 1 Frame 2a, 2b Crankshaft 3a, 3b Crankshaft 4a, 4b First gear 5a, 5b Crank 6a, 6b Pedal 7a, 7b Rotating bearing 8 Rotating shaft 9a, 9b Second gear 10a, 10b First chain 11a , 11b Pin 12a, 12b Third gear 13 Chain gear 14 Transmission gear 15 Second chain

Claims

A crankshaft that is mounted and fixed to the front side of a frame that can be attached to a bicycle or the like, a crankshaft that is rotatably attached to the crankshaft, and a first gear that is mounted and fixed to one inner end of the crankshaft. A crank attached to the other end of the outside of the crankshaft, a pedal attached to the tip of the crank, a pin attached to an intermediate portion of the frame, and an attachment rotatably attached to the pin. A third gear whose hole is eccentric from the center, a rotary bearing attached and fixed to the rear side of the frame, a rotary shaft rotatably attached to the rotary bearing, and a rotary shaft attached and fixed to the rotary shaft. A second gear whose mounting hole is eccentric from the center, a first chain straddling the first gear and the second gear, and a first chain related to the third gear, and the rotation shaft. Is a drive assisting device including the second gear and a chain gear attached and fixed in opposition to the second gear.

Centered on a crankshaft that is mounted and fixed to the front side of a frame that can be mounted on a bicycle, a crankshaft that is rotatably mounted on the crankshaft, and a mounting hole that is mounted and fixed to one end inside the crankshaft. A second gear eccentric from, a crank attached to the outer other end of the crankshaft, a pedal attached to the tip of the crank, and a pin attached to the middle of the frame. A third gear in which a mounting hole rotatably attached to the pin is eccentric from the center, a rotary bearing mounted and fixed to the rear side of the frame, and a rotation rotatably mounted on the rotary bearing. A shaft, a first gear attached and fixed to the rotary shaft, a first chain bridged to the second gear and the first gear, and a first chain related to the third gear, and the rotary shaft. Is a drive assisting device including the first gear and a chain gear attached and fixed in opposition to the first gear.

The drive assist device according to claim 1, wherein the third gear has an elliptical shape and the mounting holes are eccentric from the center.

In the drive assist device according to claim 1, the chain gear has a deformed leaf shape in which parentheses and parentheses are closed and overlapped, and when a second chain is hung on the chain gear, the second chain is used. A drive assisting device characterized in that the teeth of the chain gear are arranged so that the pins of the chain of the chain are hung on a sharp point that is the longest from the center of the chain gear.