阅读说明：本技术 一种具有增速前链轮的自行车传动机构 (Bicycle transmission mechanism with speed-increasing front chain wheel ) 是由 徐爱群 詹诗盛 顾前行 于 2019-10-09 设计创作，主要内容包括：本发明公开了一种具有增速前链轮的自行车传动机构,包括同轴分布的被动链轮、驱动盘和行星齿轮,以及与所述驱动盘可转动地相连接的定齿轮,所述定齿轮位于所述被动链轮与所述驱动盘之间。本发明在脚踏板转动一周时,自行车的前链轮能够完成超过一周的转动,实现了前链轮的增速效果,从而提高了自行车传动机构的最大传动比。(The invention discloses a bicycle transmission mechanism with a speed-increasing front chain wheel, which comprises a driven chain wheel, a driving disc, a planetary gear and a fixed gear, wherein the driven chain wheel, the driving disc and the planetary gear are coaxially distributed, the fixed gear is rotatably connected with the driving disc, and the fixed gear is positioned between the driven chain wheel and the driving disc. When the pedal rotates for one circle, the front chain wheel of the bicycle can complete the rotation for more than one circle, so that the speed increasing effect of the front chain wheel is realized, and the maximum transmission ratio of the transmission mechanism of the bicycle is improved.)

1. the utility model provides a bicycle drive mechanism with acceleration rate front sprocket, includes front sprocket, rear sprocket and chain, the chain meshing is connected between front sprocket and the rear sprocket its characterized in that: the front chain wheel comprises a driven chain wheel, a driving disc, a fixed gear and a planetary gear, wherein the driven chain wheel, the driving disc and the fixed gear are coaxially distributed, the planetary gear is rotatably connected with the driving disc, and the fixed gear is positioned between the driven chain wheel and the driving disc; the driven chain wheel comprises a first wheel disc, an inner gear ring and first gear teeth, the inner gear ring is located on the end face of one side of the first wheel disc, the first gear teeth are located on the edge of the wheel disc and distributed along the circumference, inner gear teeth are arranged on the inner circumferential surface of the inner gear ring, and a first through hole is further formed in the center of the first wheel disc; the fixed gear comprises a second wheel disc with second gear teeth and a first rotating support shaft positioned on the end face of one side of the second wheel disc, and a spline hole is formed in the center of the first rotating support shaft; the driving disc comprises a third wheel disc, spaced steps positioned at the center of the third wheel disc and a second rotating supporting shaft positioned on one side end face of the third wheel disc, and the second rotating supporting shaft is close to the outer edge of the third wheel disc; the first through hole of the driven chain wheel is rotatably sleeved on the first rotating support shaft of the fixed gear; the planetary gear is rotatably sleeved on a second rotating supporting shaft of the driving disc; a spline shaft is arranged at a pedal rotating shaft supporting rod of the bicycle frame, a spline hole of the fixed gear is in interference fit connection with the spline shaft, so that the fixed gear is fixed on the bicycle frame, and the driving disc is fixed on the pedal rotating shaft and synchronously rotates with the pedal connecting rod; the planetary gear is meshed with the inner gear teeth of the inner gear ring and the second gear teeth of the fixed gear at the same time.

2. The bicycle transmission having a speed increasing front sprocket as set forth in claim 1, wherein: the planetary gear has a plurality ofly, and each the planetary gear is the equal angular distribution of circumference along the axle center of driving-disc.

3. The bicycle transmission having a speed increasing front sprocket as set forth in claim 1, wherein: and a reinforcing rib and a lightening hole are also arranged on the first wheel disc of the driven chain wheel.

4. The bicycle transmission having a speed increasing front sprocket as set forth in claim 1, wherein: and the outer end and the inner end of the first rotating support shaft of the fixed gear are respectively provided with an elastic clamping ring groove and a limiting step.

5. The bicycle transmission having a speed increasing front sprocket as set forth in claim 1, wherein: and an elastic retainer ring is arranged on the second rotating support shaft and plays a limiting role on the planetary gear.

6. The bicycle transmission having a speed increasing front sprocket as set forth in claim 1, wherein: a bearing is arranged between the first through hole and the first rotating support shaft.

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of bicycle transmission mechanisms, in particular to a bicycle transmission mechanism with a speed-increasing front chain wheel.

[ background of the invention ]

The chain transmission is the main form of the bicycle transmission mechanism, has the advantages of light structure, easy maintenance, stable transmission and small impact vibration. With the development of bicycle chain transmission technology, the application advantages of variable speed chain transmission bicycles in complex terrain occasions are generally accepted, such as mountain bicycles and road bicycles, which adopt chain wheel combinations with different transmission ratios to meet different applications.

In order to increase the maximum transmission ratio of the variable speed bicycle on the market at present, the wheel diameter of the smallest chain wheel in the rear chain wheel is usually made as small as possible, or the wheel diameter of the largest chain wheel in the front chain wheel is realized in a technical mode as large as possible.

[ summary of the invention ]

The invention aims to solve the problems in the prior art and provides a bicycle transmission mechanism with a speed-increasing front chain wheel.

In order to achieve the purpose, the invention provides a bicycle transmission mechanism with a speed-increasing front chain wheel, which comprises a bicycle front chain wheel, a rear chain wheel and a chain, wherein the chain is connected between the front chain wheel and the rear chain wheel in a meshing manner, and the bicycle transmission mechanism is characterized in that: the front chain wheel comprises a driven chain wheel, a driving disc, a fixed gear and a planetary gear, wherein the driven chain wheel, the driving disc and the fixed gear are coaxially distributed, the planetary gear is rotatably connected with the driving disc, and the fixed gear is positioned between the driven chain wheel and the driving disc; the driven chain wheel comprises a first wheel disc, an inner gear ring and first gear teeth, the inner gear ring is located on the end face of one side of the first wheel disc, the first gear teeth are located on the edge of the wheel disc and distributed along the circumference, inner gear teeth are arranged on the inner circumferential surface of the inner gear ring, and a first through hole is further formed in the center of the first wheel disc; the fixed gear comprises a second wheel disc with second gear teeth and a first rotating support shaft positioned on the end face of one side of the second wheel disc, and a spline hole is formed in the center of the first rotating support shaft; the driving disc comprises a third wheel disc, spaced steps positioned at the center of the third wheel disc and a second rotating supporting shaft positioned on one side end face of the third wheel disc, and the second rotating supporting shaft is close to the outer edge of the third wheel disc; the first through hole of the driven chain wheel is rotatably sleeved on the first rotating support shaft of the fixed gear; the planetary gear is rotatably sleeved on a second rotating supporting shaft of the driving disc; a spline shaft is arranged at a pedal rotating shaft supporting rod of the bicycle frame, a spline hole of the fixed gear is in interference fit connection with the spline shaft, so that the fixed gear is fixed on the bicycle frame, and the driving disc is fixed on the pedal rotating shaft and synchronously rotates with the pedal connecting rod; the planetary gear is meshed with the inner gear teeth of the inner gear ring and the second gear teeth of the fixed gear at the same time.

Preferably, the planetary gear has a plurality of planetary gears, and each of the planetary gears is circumferentially equiangularly distributed along the axial center of the drive plate.

Preferably, the first wheel disc of the driven chain wheel is further provided with a reinforcing rib and a lightening hole.

preferably, the outer end and the inner end of the first rotating support shaft of the fixed gear are respectively provided with an elastic clamping ring groove and a limiting step.

preferably, an elastic collar is arranged on the second rotating support shaft and used for limiting the planetary gear.

Preferably, a bearing is provided between the first through hole and the first rotation support shaft.

The invention has the beneficial effects that: the driving disc is driven by the pedal connecting rod to synchronously rotate, the planetary gear is driven by the driving disc to do circular motion, the driven chain wheel is driven by the planetary gear to rotate, and the calculation of the gear transmission ratio shows that when a user pedals the pedal for one circle, the number of the rotating turns of the driven chain wheel exceeds one circle, the diameter of the planetary gear is smaller, the number of the rotating turns of the driven chain wheel is larger (smaller than two circles), the driving speed is improved compared with that of a common bicycle front chain wheel, and the maximum transmission ratio of the transmission mechanism is obviously improved.

The features and advantages of the present invention will be described in detail by embodiments in conjunction with the accompanying drawings.

[ description of the drawings ]

FIG. 1 is a front perspective view of a bicycle front sprocket of the present invention;

FIG. 2 is a front perspective view of the front sprocket of the bicycle of the present invention;

FIG. 3 is a rear perspective view of the front bicycle sprocket of the present invention;

FIG. 4 is a schematic view of the construction of the driven sprocket of the present invention;

FIG. 5 is a schematic view of the structure of the fixed gear of the present invention;

FIG. 6 is a schematic view of the structure of a drive plate in the present invention;

FIG. 7 is a schematic structural view of a bicycle frame in an embodiment;

FIG. 8 is an enlarged view of portion A of FIG. 7;

Fig. 9 is a schematic view of a practical application of the transmission mechanism in a bicycle.

In the figure: 1-driven chain wheel, 2-fixed gear, 3-driving disc, 4-planetary gear, 5-pedal connecting rod, 6-bicycle frame, 7-chain, 8-rear chain wheel, 101-first wheel disc, 102-inner gear ring, 103-first wheel tooth, 104-first through hole, 105-inner wheel tooth, 106-reinforcing rib, 201-second wheel tooth, 202-first rotating support shaft, 203-spline hole, 204-elastic clamping ring groove, 205-limiting step, 301-third wheel disc, 302-second rotating support shaft, 303-spacing step and 601-spline shaft.

[ detailed description ] embodiments