阅读说明：本技术 自行车自动变速器 (Automatic speed variator for bicycle ) 是由 邓一霖 李赞荣 于 2018-06-22 设计创作，主要内容包括：一种自行车自动变速器,包括底盘、滑块、六齿轮、拨叉、弹簧等结构,六齿轮、拨叉安装在滑块上。所述底盘是圆形结构,其上按六等分,在相对的四个位置上分别设四个滑道,滑块安装于滑道内,可以在滑道内滑动,所述弹簧,上端与滑块上端连接,下端与滑道底部连接。所述的自动变速器,安装于自行车前牙盘位置,取代前牙盘,自行车链条缠绕在六齿轮和拨叉上,根据链条阻力、拉力和弹簧弹力的合力,自动调整传动力臂大小,达到自动调速的目的。(An automatic speed variator for bicycle is composed of chassis, slide block, six gears, shift fork and spring. The chassis is circular structure, and according to six equalling on it, set up four slides respectively on four relative positions, the slider is installed in the slide, can slide in the slide, the spring, the upper end is connected with the slider upper end, and the lower extreme is connected with the slide bottom. The automatic transmission is arranged at the position of a front chain wheel of the bicycle to replace the front chain wheel, a bicycle chain is wound on the six gears and the shifting fork, and the size of a transmission force arm is automatically adjusted according to the resultant force of the resistance, the tension and the spring elasticity of the chain, so that the purpose of automatic speed regulation is achieved.)

1. An automatic speed variator for bicycle is characterized in that:

the automatic transmission comprises a chassis, a sliding block, six gears, a shifting fork, a spring and other structures, wherein the six gears and the shifting fork are arranged on the sliding block.

2. The chassis of claim 1, wherein:

the chassis is circular structure, and according to six equalling on it, set up four slides respectively on four relative positions, the slider is installed in the slide, can slide in the slide, the spring, the upper end is connected with the slider upper end, and the lower extreme is connected with the slide bottom.

3. The automatic transmission of claim 1, mounted at a front chain wheel position of the bicycle, in place of the front chain wheel, and the bicycle chain is wound around the six gears and the shift fork.

Background art:

the existing speed-changing bicycle mainly has the combined action of front speed change and rear speed change. When the front speed change is started again in a high-speed brake, the labor is particularly wasted, and a period of time is needed for changing from a high-speed gear to a low-speed gear, which is troublesome.

The content is as follows:

the invention aims to provide a device capable of automatically adjusting a force arm according to the tension and the resistance of a bicycle chain, which changes the moment by using a spring to realize automatic speed change so as to improve the labor-consuming phenomenon when the existing high-speed gear is restarted and ensure that the high-speed gear can be immediately adjusted to a proper gear.

The technical scheme adopted by the invention for solving the technical problems is as follows: an automatic speed variator for bicycle is composed of chassis, slide block, six gears, shift fork and spring. The chassis is circular structure, and according to six equalling on it, set up four slides respectively on four relative positions, the slider is installed in the slide, can slide in the slide, the spring, the upper end is connected with the slider upper end, and the lower extreme is connected with the slide bottom. The automatic transmission is arranged at the position of a front chain wheel of the bicycle to replace the front chain wheel, a bicycle chain is wound on the six gears and the shifting fork, and the size of a transmission force arm is automatically adjusted according to the resultant force of the resistance, the tension and the spring elasticity of the chain, so that the purpose of automatic speed regulation is achieved.

The invention has the advantages that the force arm can be automatically adjusted according to the tension and the resistance of the bicycle chain, the moment is changed by the spring, the automatic speed change is realized, and the gear can be immediately adjusted to a proper gear according to the resistance so as to improve the labor waste phenomenon when the existing high-speed gear is restarted.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a block diagram of the present invention.

In the figure, 1, a chassis, 2, a slide way, 3, a slide block, 4, a shifting fork, 5, a six-gear, 6, a spring, 7, a screw, 8, a circular table, 9, a six-gear circular shaft, 10, a middle shaft hole, 11, a slide block upper end fixing sheet, 12, a pedal rod, 13, a pedal and 14, a bicycle chain are arranged.

Detailed Description

FIG. 1 is a structural diagram of the present invention, which mainly comprises a chassis 1, a slide block 3, six gears 5, a shifting fork 4, a spring 6, etc., wherein six parts are uniformly distributed outside the chassis, two pairs of opposite four positions are selected to be respectively provided with a slide way 2, the slide block 3 is arranged in the slide way, a pair of six gears 5 or shifting forks 4 are arranged at opposite positions on the slide block, the six gears mainly play a supporting role, and the shifting fork mainly plays a force transmission role, six gears 5 are arranged at the other two opposite positions, a spring 6 is arranged in a slide way 2, one end of the spring is propped against the bottom of the slide way, the other end of the spring is propped against an upper end fixing piece 11 of a slide block, a screw 7 penetrates through the upper end fixing piece 11 of the slide block and the spring 6 and is screwed at the bottom of the slide way to play a limiting role of the slide block, a pedal rod 13 is arranged on a chassis 1, a bicycle chain 14 is wound on a shifting fork 4 and the six gears 5, and the force of the bicycle chain on the shifting fork and the six gears is synthesized by the resistance force borne by a bicycle and the pulling force transmitted from.

The principle of speed change is as follows, when the bicycle is in low-speed gear, the resistance of the bicycle chain 14 is large, the pulling force required for advancing against the resistance is also large, the pressure acting on the spring is also large, the spring 6 automatically contracts, the force arm contracts to be small, the force used on the pedal 14 is small, and the low-speed gear is ensured to be not hard; on the contrary, when the bicycle is in a high-speed gear, the resistance of the chain is small, the pulling force required for overcoming the resistance to advance is small, the pressure acting on the spring 6 is small, the spring 6 automatically extends, the moment arm is enlarged, the force used on the pedal 14 is enlarged, the high-speed gear can still use the upper force, and the automatic speed change effect is achieved.