Front speed changer for bicycle
A technology for front derailleurs and bicycles, which is applied to vehicle gearboxes, vehicle components, chain/belt transmissions, etc., and can solve problems such as inability to fine-tune, inability to improve transmission performance, and inability to change gears
Inactive Publication Date: 2010-07-07
SAKAE ENG
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Problems solved by technology
[0005] However, the shifting performance on the front side cannot be improved the more the gear is shifted up (that is, the chain is changed from the small gear side to the large diameter gear side), especially when climbing a slope, a large torque will be applied to the chain. Therefore, when it is attempted to force the shifting by operating the shift lever to move the front derailleur in conjunction with the aforementioned chain in the direction of the width of the bicycle, sometimes the situation of being unable to shift the speed will still occur.
[0006] And as mentioned above, almost all the current shift levers have a time-moving mechanism, which cannot be fine-tuned (that is, excessive shifting), so as long as a large torque is applied, there will be situations where the shifting cannot be performed at any time.
[0007] In order to solve this situation, the applicant once proposed on March 2, 2007 the No. 200836971 "Bicycle with the front speed change system" China Taiwan invention application, although this invention patent application is for from the small diameter gear to the middle diameter gear, And the speed change performance from the middle diameter gear to the large diameter gear has been improved, but the speed change performance from the large diameter gear to the middle diameter gear and from the middle diameter gear to the small diameter gear cannot be improved.
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[0036] Furthermore, in the present invention, a gear shift lever (not shown) is operated to link a linkage mechanism, so that the linkage mechanism drives a chain guide element, so that the chain guide element deflects while being displaced. And utilize the action mode of this chain guide element to deflect while displacing, make this chain guide element can provide a larger deflection amount of touching the chain, and then make this chain guide element guide chain change gear to change When changing gears, it has easier and smoother performance.
[0037] More specifically, when the chain guide moves toward the inner side of the bicycle width, the aforementioned chain guide moves while rotating clockwise when viewed from the front of the bicycle. , the aforementioned chain guide element, viewed from the front of the bicycle, moves while rotating counterclockwise.
[0038] And in order to fully exert the effect of the present invention, in the gear shifting from the sprocket l...
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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 [0001] The present invention relates to a front derailleur for a bicycle, in particular to a front derailleur for a bicycle that can greatly improve the transmission performance of a chain from a large-diameter gear to a middle-diameter gear, and from a middle-diameter gear to a small-diameter gear. Background technique [0002] At present, the bicycle with derailleur is based on the product that the front sprocket of the bicycle is provided with 3 gears, and the free wheel at the rear is provided with 7-9 gears as the mainstream, and the front derailleur is provided at the front, and the rear derailleur is provided at the rear. The chain is wound on a certain gear of the front sprocket or the rear sprocket by operating the front derailleur or the rear derailleur to change the gear ratio between the front sprocket and the rear sprocket to achieve the speed change effect. [0003] The operation mode of the front derailleur and the rear derailleur is mainly to ...
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IPC IPC(8): B62M9/10
Inventor 岩崎义久
Owner SAKAE ENG