CN101767626B - Front speed changer for bicycle - Google Patents
Front speed changer for bicycle Download PDFInfo
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- CN101767626B CN101767626B CN 200810189317 CN200810189317A CN101767626B CN 101767626 B CN101767626 B CN 101767626B CN 200810189317 CN200810189317 CN 200810189317 CN 200810189317 A CN200810189317 A CN 200810189317A CN 101767626 B CN101767626 B CN 101767626B
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- bicycle
- chain
- guide element
- chain guide
- gear
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- 230000007246 mechanism Effects 0.000 claims description 27
- 230000009194 climbing Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 10
- 238000006073 displacement reaction Methods 0.000 description 5
- 101500021084 Locusta migratoria 5 kDa peptide Proteins 0.000 description 1
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Abstract
The invention relates to a front speed changer for a bicycle. If a chain guiding element of the front speed changer moves towards a wide inner side direction of the bicycle, viewed from the front of the bicycle, the chain guiding element moves towards the side for clockwise rotation. If the chain guiding element of the front speed changer moves towards a wide outer side direction of the bicycle, viewed from the front of the bicycle, the chain guiding element moves towards the side for anti-clockwise rotation. The front speed changer for a bicycle provided by the invention can promote the speed change performance for the chain from a big diameter gear to a middle diameter gear and from the middle diameter gear to a small diameter gear in a chain wheel even if a huge torsion force is exerted on the chain in the process of climbing.
Description
Technical field
The present invention refers in particular to a kind of front speed-change device for bicycle that can significantly promote the past middle footpath of the arrogant footpath of chain gear gear, reach the gearshift performance of the past small-diameter gear of gear from middle footpath relevant for a kind of front speed-change device for bicycle.
Background technology
At present; Bicycle with change-speed box be the preceding sprocket wheel with bicycle be provided with 3 gears, and the goods that are provided with 7～9 gears of free gear in the wings be main flow; And establish Front Derailleur forwardly; Rear Derailleur is established at the rear, selects the chain winding on some gears of preceding sprocket wheel or back sprocket wheel to utilize operation Front Derailleur or Rear Derailleur, the gear before changing with this between sprocket wheel and back sprocket wheel than and reach the usefulness of speed change.
And the operating mode of Front Derailleur and Rear Derailleur; It mainly is the shifter bar of actuation mechanism when having through operation; This Front Derailleur or Rear Derailleur are moved toward bicycle overall width direction, make the position change that hangs of chain, and then sprocket wheel and afterwards the gear ratio between sprocket wheel before changing.
In addition; The dealer is arranged in order to improve the gear change property of Front Derailleur and Rear Derailleur, improve to the shape of gear, expectation improves gearshift performance with this; Even especially the gearshift performance of rear side in climbing when chain applies very big torsion, more speed change then gearshift performance more improve.
But; The gearshift performance of front side is that more upwards shift (referring to that promptly chain changes the chaining bar from the small-diameter gear side towards the large diameter gear side) just more can't improve; Especially when climbing, have very big torsion and be applied on the chain, so desire makes the aforementioned chain of Front Derailleur interlock move toward bicycle overall width direction through the operation shifter bar; When forcing speed change with attempt, sometimes still can take place can't speed change situation.
And as stated, actuation mechanism when present shifter bar nearly all has can't be finely tuned (that is excessively speed change), thus as long as be applied with very big torsion, all have any time can't speed change situation.
In order to solve this situation; The applicant once proposed No. 200836971 " front speed changing system for bicycle " TaiWan, China invention of publication number application case on March 2nd, 2007; Though this application for a patent for invention case for from the path gear toward middle footpath gear, and from middle footpath gear makes moderate progress toward the gearshift performance of large diameter gear, still can't improve arrogant footpath gear toward middle footpath gear, and from middle footpath the gearshift performance of the past small-diameter gear of gear.
Summary of the invention
Because said circumstances; Technical matters to be solved by this invention provides a kind of front speed-change device for bicycle; Even when climbing, be applied with very big torsion in chain; Also can significantly improve in sprocket wheel, the arrogant footpath of chain gear toward middle footpath gear, and from middle footpath gear toward the gearshift performance of small-diameter gear.
In order to reach above-mentioned purpose, a kind of front speed-change device for bicycle provided by the invention drives a chain guide element through an interlinked mechanism and moves in bicycle overall width direction; This interlinked mechanism is a ring mechanism; This ring mechanism comprises that four arm elements and adjacent arm element are pivoted each other, and the chain guide element is moved toward the interior side direction of bicycle overall width, and is unequal through the pitch length that deliberately makes the arm element; When the chain guide element of this Front Derailleur when side direction moves in the bicycle overall width; Looked by the sight of bicycle the place ahead, aforementioned chain guide element moves toward right-hand revolution on one side on one side, when aforementioned chain guide element moves toward bicycle overall width lateral direction; Looked by the sight of bicycle the place ahead, aforementioned chain guide element is mobile on one side toward the anticlockwise direction rotation on one side.
According to such scheme; The present invention is significant with respect to the effect of prior art: even front speed-change device for bicycle provided by the invention is applied with very big torsion in chain when climbing; Also can significantly improve in sprocket wheel, the arrogant footpath of chain gear toward middle footpath gear, and from middle footpath gear toward the gearshift performance of small-diameter gear.
Description of drawings
Fig. 1 is the rough schematic view with change-speed box bicycle.
Fig. 2 for see from bicycle the place ahead the Front Derailleur scheme drawing.
Fig. 3 is the chain process distance base diagram with respect to Front Derailleur.
Fig. 4 for see from bicycle the place ahead with respect to the chain of Front Derailleur through distance base diagram.
Fig. 5 for see from bicycle the place ahead with respect to the chain of Front Derailleur through distance base diagram.
Fig. 6 for bicycle the place ahead see with respect to the chain of Front Derailleur through distance base diagram.
Fig. 7 is the comparison diagram of the present invention and existing goods.
Fig. 8 is the comparison diagram of the present invention and existing goods.
Fig. 9 is the comparison diagram of the present invention and existing goods.
The main element nomenclature
1aa, T1aa large diameter gear and back during small-diameter gear before chain hang on, chain contact and the point of pushing
1ab, Tlab before chain hang in footpath gear and back during small-diameter gear, chain contact and the point of pushing
1ac, T1ac small-diameter gear and back during small-diameter gear before chain hang on, the point of chain contact
1ba, Tlba large diameter gear and back during large diameter gear before chain hang on, chain contact and the point of pushing
1bb, T1bb before chain hang in footpath gear and back during large diameter gear, chain contact and the point of pushing
1bc, T1bc small-diameter gear and back during large diameter gear before chain hang on, chain contact and the point of pushing
1 Front Derailleur, 11 chain guide elements
12 ring mechanisms, 121 arm elements
122 arm elements, 123 arm elements
124 arm elements, 21 path gears
22 maximum diameter gears, 31 big gear wheels
32 middle gears, 33 miniature gearss
A chain B chain
C chain D chain
E chain F chain
The specific embodiment
Further, the present invention with interlock one interlinked mechanism, makes this interlinked mechanism drive a chain guide element through operation one shifter bar (not shown), makes this chain guide element displacement on one side one edge run-out.And utilize the pattern of this chain guide element displacement on one side one edge run-out; Make this chain guide element that a bigger side-play amount of touching chain of dialling can be provided; And then make this chain guide element at the guide chain pick-off gear when shifted, have be more prone to, usefulness smoothly.
More particularly, when chain guide element when side direction moves in the bicycle overall width, aforementioned chain guide element; Sight is looked from bicycle the place ahead; Be to move on one side toward right-hand revolution on one side, when moving toward bicycle overall width lateral direction, aforementioned chain guide element; Sight is looked from bicycle the place ahead, is mobile on one side toward the anticlockwise direction rotation on one side.
And in order to give full play to effect of the present invention, in the speed change that moves toward small-diameter gear from the sprocket wheel large diameter gear, setting and making the rotation of chain guide element is best above 2.8 degree.
Below; With reference to drawing one of which preferred embodiment of the present invention is described; This interlinked mechanism is a ring mechanism in this embodiment; And when with the member pitch change of ring mechanism, just can make this chain guide element make the pattern of one edge run-out of displacement on one side, make this chain guide element that a bigger side-play amount of touching chain of dialling can be provided.Wherein: Fig. 1 is the rough schematic view with change-speed box bicycle; Fig. 2 for see from bicycle the place ahead the Front Derailleur scheme drawing; Fig. 3 is the chain process distance base diagram with respect to Front Derailleur; Fig. 4～Fig. 6 for see from bicycle the place ahead with respect to the chain of Front Derailleur through distance base diagram; Fig. 7～Fig. 9 is the comparison diagram of the present invention and existing goods.
This Front Derailleur 1 comprises a chain guide element 11, and this chain guide element 11 can pass through joystick (not shown) transmission one ring mechanism 12, to move and beat in bicycle overall width direction through this this chain guide element 11 of ring mechanism 12 interlocks.
This ring mechanism 12 comprises four arm elements 121～124; Wherein the first arm element 121 to the 4th arm elements 124 articulate in regular turn and are connected circlewise; At least make wherein a pair of arm element 122 and 124 supply the pitch length at another place, axle center that arm element 121 and 123 is hubbed at this wherein a pair of arm element 122 and 124 2 ends unequal; Make this ring mechanism 12 except can interlock this chain guide element 11 in bicycle overall width direction moves, can also make chain guide element 11 produce the beats motion.
The pitch length of the first arm element 121 is a1; The pitch length of the 3rd arm element 123 is a2.The pitch length of the second arm element 122 is b1; The pitch length of the 4th arm element 124 is b2.Make a1＞a2; B1＜b2 when chain guide element 11 is moved toward the interior side direction of bicycle overall width, is looked by the sight of bicycle the place ahead; This chain guide element 11 is to move on one side toward right-hand revolution on one side; When chain guide element 11 moves toward bicycle overall width lateral direction, to look by the sight of bicycle the place ahead, move toward the anticlockwise direction rotation on one side on 11 one side of this chain guide element.
During more detailed the explanation; Chain A～C that Fig. 1 shows is respectively around 31,32,33 of the large, medium and small gears of the path gear 21 that is hung on the back sprocket wheel and preceding sprocket wheel, and chain D～F is respectively around 31,32,33 of the large, medium and small gears of maximum diameter gear 22 that is hung on back sprocket wheel and preceding sprocket wheel.Fig. 3～Fig. 6 is presented at group contact position 1aa, 1ab, 1ac, 1ba, 1bb, the 1bc of 11 of state lower chain A～F and the chain guide elements of operation shift.And more can further learn by Fig. 4～Fig. 6; At chain guide element 11 when side direction moves in the bicycle overall width; Looked by the sight of bicycle the place ahead, this chain guide element 11 is to move on one side toward right-hand revolution on one side, when chain guide element 11 moves toward bicycle overall width lateral direction; Looked by the sight of bicycle the place ahead, move toward the anticlockwise direction rotation on one side on 11 one side of this chain guide element.
Below please join Fig. 7～Fig. 9 and and with reference to figure 1; When the stain representative is operated shift with existing Front Derailleur; Respectively around the path gear 21 that is hung on the back sprocket wheel and 31,32,33 of the large, medium and small gears of preceding sprocket wheel and respectively around the chain A～F of 31,32,33 of the large, medium and small gears of maximum diameter gear 22 that is hung on the back sprocket wheel and preceding sprocket wheel, and group contact position Tlaa, Tlab, Tlac, Tlba, Tlbb, the Tlbc of 11 of chain guide elements.When on behalf of Front Derailleur of the present invention, hollow dots then operate shift; Respectively around the path gear 21 that is hung on the back sprocket wheel and 31,32,33 of the large, medium and small gears of preceding sprocket wheel and respectively around the chain A～F of 31,32,33 of the large, medium and small gears of maximum diameter gear 22 that is hung on the back sprocket wheel and preceding sprocket wheel, and group contact position 1aa, 1ab, 1ac, 1ba, 1bb, the 1bc of 11 of chain guide elements.Under the contrast of its position; The chain guide element 11 that more can show Front Derailleur of the present invention is because of having deflection cw or left-hand revolution ability; Chain guide element 11 is being dialled when touching the chain gear shift; Can provide bigger dialling to touch the chain side-play amount, make shifted usefulness be more prone to, smooth and easy.When more specifying; In Fig. 8; When the Front Derailleur with Front Derailleur of the present invention and prior art compared, the bicycle overall width direction distance of dialling contact position 1aa and dialling between contact position Tlaa that its chain A and chain guide element are 11 promptly differed 0.3805mm; The bicycle overall width direction distance of dialling contact position 1bb and dialling between contact position Tlbb that chain E and chain guide element are 11 promptly differs 0.0029mm.When the operation shifter bar made the past middle footpath of the arrogant footpath of chain gear change gear, the present invention and existing structure were in comparison; The change amount of chain can increase about 0.38mm.In Fig. 9, when the Front Derailleur with Front Derailleur of the present invention and prior art compared, the bicycle overall width direction distance of dialling contact position 1ab and dialling between contact position Tlab that its chain B and chain guide element are 11 promptly differed 0.8904mm; The bicycle overall width direction distance of dialling contact position 1bc and dialling between contact position Tlbc that chain F and chain guide element are 11 promptly differs 0.0167mm.Gear change is when the small-diameter gear from middle footpath when the operation shifter bar makes chain, and the present invention and existing structure are in comparison; The change amount of chain can increase about 0.87mm.Can confirm more thus, when with the member pitch change of ring mechanism, just can make this chain guide element make the pattern of one edge run-out of displacement on one side, and make this chain guide element bigger side-play amount arranged dialling to possess when touching chain.
The deflection angle of chain guide element 11 then can't be brought into play effect when hour.Therefore, preferably set the pitch of ring mechanism member, when chain guide element 11 arrogant footpath gears are moved toward small-diameter gear, more than beat 2.8 degree.
Above-mentioned link structure is merely and makes technological means of the present invention can be easy to understand; And non-limiting interlinked mechanism of the present invention is decided to be ring mechanism; Promptly be merely one of them preferred embodiment of interlinked mechanism of the present invention, and any mechanism that can cause this chain guide element to make the pattern of one edge run-out of displacement on one side all should be regarded as not breaking away from patent category of the present invention at the ring mechanism of this proposition.
Claims (2)
1. front speed-change device for bicycle; It is characterized in that: drive a chain guide element through an interlinked mechanism and move in bicycle overall width direction, this interlinked mechanism is a ring mechanism, and this ring mechanism comprises that four arm elements and adjacent arm element are pivoted each other; The chain guide element is moved toward the interior side direction of bicycle overall width; Pitch length through deliberately making the arm element is unequal, and this chain guide element side direction in the bicycle overall width is when moving, and is seen by bicycle the place ahead and looks; Aforementioned chain guide element moves toward right-hand revolution on one side on one side; When the chain guide element moves toward bicycle overall width lateral direction, to look by the sight of bicycle the place ahead, aforementioned chain guide element is mobile on one side toward the anticlockwise direction rotation on one side.
2. front speed-change device for bicycle as claimed in claim 1 is characterized in that: the anglec of rotation of this chain guide element is configured to rotation and surpasses 2.8 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810189317 CN101767626B (en) | 2008-12-29 | 2008-12-29 | Front speed changer for bicycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810189317 CN101767626B (en) | 2008-12-29 | 2008-12-29 | Front speed changer for bicycle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101767626A CN101767626A (en) | 2010-07-07 |
| CN101767626B true CN101767626B (en) | 2012-12-12 |
Family
ID=42500769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200810189317 Expired - Fee Related CN101767626B (en) | 2008-12-29 | 2008-12-29 | Front speed changer for bicycle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101767626B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3956943A (en) * | 1972-10-25 | 1976-05-18 | Maeda Industries, Ltd. | Bicycle sprocket wheel |
| US5188569A (en) * | 1991-03-29 | 1993-02-23 | Maeda Industries, Ltd. | Multiple sprocket assembly for bicycle |
| CN1319732A (en) * | 2000-03-31 | 2001-10-31 | 本田技研工业株式会社 | belt transmission |
| CN1694831A (en) * | 2002-11-26 | 2005-11-09 | 株式会社荣技研 | Transmission for bicycle |
-
2008
- 2008-12-29 CN CN 200810189317 patent/CN101767626B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3956943A (en) * | 1972-10-25 | 1976-05-18 | Maeda Industries, Ltd. | Bicycle sprocket wheel |
| US5188569A (en) * | 1991-03-29 | 1993-02-23 | Maeda Industries, Ltd. | Multiple sprocket assembly for bicycle |
| CN1319732A (en) * | 2000-03-31 | 2001-10-31 | 本田技研工业株式会社 | belt transmission |
| CN1694831A (en) * | 2002-11-26 | 2005-11-09 | 株式会社荣技研 | Transmission for bicycle |
Non-Patent Citations (1)
| Title |
|---|
| JP昭60-219187A 1985.11.01 |
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| Publication number | Publication date |
|---|---|
| CN101767626A (en) | 2010-07-07 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121212 Termination date: 20171229 |
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| CF01 | Termination of patent right due to non-payment of annual fee |