JP4535402B1 - Bicycle crank mechanism - Google Patents
Bicycle crank mechanism Download PDFInfo
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- JP4535402B1 JP4535402B1 JP2009059551A JP2009059551A JP4535402B1 JP 4535402 B1 JP4535402 B1 JP 4535402B1 JP 2009059551 A JP2009059551 A JP 2009059551A JP 2009059551 A JP2009059551 A JP 2009059551A JP 4535402 B1 JP4535402 B1 JP 4535402B1
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- arm
- pedal
- crank
- bicycle
- crankshaft
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Abstract
【課題】自転車のクランクにおいて、ペダルの前後の軌道の移動幅を小さくして、こぎ手の膝関節の負担の少い自転車を提供する。
【解決手段】クランク軸に係合した第一のクランクアーム(2)端にクランク軸(1)と平行な中間回転軸(3)を設け、この中間回転軸に第一のクランクアーム(2)より長い第二のアーム(4)を正逆回転自在に係合し、この第二のアーム(4)端にペダル(5)を設け、かつペダル(5)の軸を自転車内側に延長した突起(7)を設け、この突起(7)は車体に固定された案内部材(6)のスリットに挿入され、このスリット(6)に案内されたペダル軌道で駆動するようにクランク機構を構成する。
【選択図】図2The present invention provides a bicycle with a reduced burden on the knee joint of a rower by reducing the movement width of a track before and after a pedal in a bicycle crank.
An intermediate rotating shaft (3) parallel to the crankshaft (1) is provided at an end of a first crank arm (2) engaged with the crankshaft, and the first crank arm (2) is provided on the intermediate rotating shaft. A projection that engages a longer second arm (4) so as to be rotatable forward and backward, has a pedal (5) at the end of the second arm (4), and extends the shaft of the pedal (5) to the inside of the bicycle (7) is provided, and the projection (7) is inserted into a slit of a guide member (6) fixed to the vehicle body, and the crank mechanism is configured to be driven by a pedal track guided by the slit (6).
[Selection] Figure 2
Description
本発明は、自転車のクランク機構の改良に関するものである。 The present invention relates to an improvement in a bicycle crank mechanism.
従来のクランク機構として、第一のクランクアーム端にクランク軸と平行な中間回転軸を設け、この中間回転軸に正転方向への回転を不能に第二のアームを係合し、この第二のアーム端にペダルを設けたものが、特開2007−55332に示されている。
また、リンク機構により、負荷状態に応じてクランク半径が自動伸縮するクランク機構が特開2003−312581に示されている。
As a conventional crank mechanism, an intermediate rotating shaft parallel to the crankshaft is provided at the end of the first crank arm, and the second arm is engaged with the intermediate rotating shaft so as not to rotate in the forward rotation direction. Japanese Patent Application Laid-Open No. 2007-55332 has a pedal provided at the end of the arm.
Japanese Patent Laid-Open No. 2003-312581 discloses a crank mechanism in which a crank radius is automatically expanded and contracted according to a load state by a link mechanism.
しかしながら従来の構造にあっては、足こぎの力を小さくする効果はあるが、ペダルの軌道が第一のクランクアーム回転軌道の前後方向移動幅より大きくなることによる振れ角度拡大に伴い膝関節の負担が大きくなるという課題がある。 However, in the conventional structure, there is an effect of reducing the force of the foot, but as the swing angle increases due to the pedal trajectory becoming larger than the longitudinal movement width of the first crank arm rotation trajectory, the knee joint There is a problem of increasing the burden.
上記の課題を解決するために、本発明に係る自転車のクランク機構は、クランク軸に係合した第一のクランクアーム端にクランク軸と平行な中間回転軸を設け、この中間回転軸に第一のクランクアームより長い第二のアームを正逆回転自在に係合し、この第二のアーム端にペダルを設け、かつペダルの軸を自転車内側に延長した突起を設け、この突起は車体に固定された案内部材のスリットに挿入され、このスリットに案内されたペダル軌道で駆動することを特徴とする。 In order to solve the above problems, a bicycle crank mechanism according to the present invention is provided with an intermediate rotation shaft parallel to the crankshaft at the end of the first crank arm engaged with the crankshaft, and the intermediate rotation shaft is provided with a first rotation shaft. Engage the second arm, which is longer than the crank arm, in forward and reverse rotation, provide a pedal at the end of the second arm, and provide a protrusion that extends the pedal shaft to the inside of the bicycle, and this protrusion is fixed to the vehicle body. It is inserted into the slit of the guide member formed, and is driven by a pedal track guided by the slit.
上記の機構とすることにより、膝の角度変化が少なくなり、膝関節の負担を軽減できる。 By adopting the above mechanism, the change in the angle of the knee is reduced, and the burden on the knee joint can be reduced.
以下、本発明の実施例について図を参照して説明する。 Embodiments of the present invention will be described below with reference to the drawings.
図1は本発明の実施例を説明するための参考例のクランク機構を横から見た図である。
クランク軸(1)に第一のクランクアーム(2)が係合され、第一のクランクアーム(2)端にはクランク軸(1)と平行な中間回転軸(3)が設けられ、この中間回転軸(3)に第二のアーム(4)が正逆回転自在に係合され、第二のアーム(4)端にペダル(5)が設けられている。
FIG. 1 is a side view of a crank mechanism of a reference example for explaining an embodiment of the present invention.
The first crank arm (2) is engaged with the crankshaft (1), and an intermediate rotation shaft (3) parallel to the crankshaft (1) is provided at the end of the first crank arm (2). A second arm (4) is engaged with the rotating shaft (3) so as to be rotatable forward and backward, and a pedal (5) is provided at the end of the second arm (4).
第二のアーム(4)は、中間回転軸(3)まわりに正逆回転自在であり、こぎ手によってペダル(5)の軌道を第二のアーム(4)の振れる範囲で自由にこぐことができ、つまり例えばAのような軌道でこぐことが可能となる。尚、第一のクランクアーム(2)に対する第二のアーム(4)の長さを長くするほど軌道の自由度は大きくなり、少なくとも長さの比を1以上とするのが好ましい。 The second arm (4) can freely rotate forward and backward around the intermediate rotation axis (3), and can freely traverse the trajectory of the pedal (5) within a range where the second arm (4) can swing by a saw. Yes, that is, it is possible to paddle in an orbit like A, for example. The longer the length of the second arm (4) relative to the first crank arm (2), the greater the degree of freedom of the trajectory, and it is preferable that at least the length ratio is 1 or more.
図2は本発明のペダルの軌道に案内を設けた、本発明の実施例である。
ペダル(5)の軸を自転車内側に延長した突起(7)を設け、この突起(7)は車体(図示していない)に固定された案内部材(6)のスリットに挿入されており、こぎ手の加減によらず、このスリットに案内されたペダル(5)の軌道でクランクを駆動することができる。
FIG. 2 shows an embodiment of the present invention in which a guide is provided on the track of the pedal of the present invention .
A protrusion (7) is provided by extending the pedal (5) shaft to the inside of the bicycle, and this protrusion (7) is inserted into a slit of a guide member (6) fixed to the vehicle body (not shown). The crank can be driven by the trajectory of the pedal (5) guided by the slit regardless of the hand.
図3は第二のアーム(4)を折りたたみ式とした参考例である。
第二のアーム(4)はピン(8)によりB方向に可倒に係合されており、自転車を収納する時には簡単に折りたたんでコンパクトにすることができる。一方、使用時においては、第一のクランクアーム(2)がどの回転位置であっても第二のアーム(4)は常に下方向を向いており踏力も下向に働くため、第二のアーム(4)は折りたたみの方向であるB方向に倒れることはない。
FIG. 3 is a reference example in which the second arm (4) is foldable.
The second arm (4) is reversibly engaged in the B direction by a pin (8), and can be easily folded to be compact when storing the bicycle. On the other hand, during use, the second arm (4) always faces downward regardless of the rotational position of the first crank arm (2), and the pedal force also works downward. (4) does not fall in the B direction which is the folding direction.
図4は本発明においてペダル(5)を回転収納式とした参考例である。
ペダル(5)は第二のアーム(4)の長手軸まわりに回転自在に係合されており、使用しない時には簡単に回転して収納することができる。一方、使用時においては、第一のクランクアーム(2)がどの回転位置であっても第二のアーム(4)は常に下方向に向いており踏力も下向に働くためペダル(5)が第二のアーム(4)の長手方向軸まわりに回転することはない。
FIG. 4 is a reference example in which the pedal (5) is a rotary storage type in the present invention.
The pedal (5) is rotatably engaged about the longitudinal axis of the second arm (4), and can be easily rotated and stored when not in use. On the other hand, when in use, the second arm (4) always faces downward regardless of the rotational position of the first crank arm (2), and the pedaling force also works downward. There is no rotation around the longitudinal axis of the second arm (4).
本発明は、人力で駆動するクランク機構形態の全ての自転車に適用可能である。 The present invention is applicable to all bicycles in the form of a crank mechanism that is driven by human power.
1 クランク軸
2 第一のクランクアーム
3 中間回転軸
4 第二のアーム
5 ペダル
6 案内部材
7 突起
8 ピン
1
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009059551A JP4535402B1 (en) | 2009-03-12 | 2009-03-12 | Bicycle crank mechanism |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009059551A JP4535402B1 (en) | 2009-03-12 | 2009-03-12 | Bicycle crank mechanism |
Publications (2)
Publication Number | Publication Date |
---|---|
JP4535402B1 true JP4535402B1 (en) | 2010-09-01 |
JP2010208582A JP2010208582A (en) | 2010-09-24 |
Family
ID=42824718
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2009059551A Expired - Fee Related JP4535402B1 (en) | 2009-03-12 | 2009-03-12 | Bicycle crank mechanism |
Country Status (1)
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JP (1) | JP4535402B1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4829543U (en) * | 1971-08-14 | 1973-04-11 | ||
JPH0315873U (en) * | 1989-06-26 | 1991-02-18 | ||
JP2003054477A (en) * | 2001-08-14 | 2003-02-26 | Yoshinori Nakabashi | Auxiliary crank for bicycle |
JP2003312581A (en) * | 2002-04-23 | 2003-11-06 | San Life:Kk | Bicycle provided with automatic elastic change type crank mechanism corresponding to drag |
JP2007055332A (en) * | 2005-08-23 | 2007-03-08 | Tamagawa Gakuen | Driving mechanism |
-
2009
- 2009-03-12 JP JP2009059551A patent/JP4535402B1/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4829543U (en) * | 1971-08-14 | 1973-04-11 | ||
JPH0315873U (en) * | 1989-06-26 | 1991-02-18 | ||
JP2003054477A (en) * | 2001-08-14 | 2003-02-26 | Yoshinori Nakabashi | Auxiliary crank for bicycle |
JP2003312581A (en) * | 2002-04-23 | 2003-11-06 | San Life:Kk | Bicycle provided with automatic elastic change type crank mechanism corresponding to drag |
JP2007055332A (en) * | 2005-08-23 | 2007-03-08 | Tamagawa Gakuen | Driving mechanism |
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JP2010208582A (en) | 2010-09-24 |
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