Transmission mechanism of bicycle

Abstract

The embodiment of the utility model discloses a transmission mechanism of a bicycle. The transmission mechanism comprises a frame front cover, a connecting pipe and a frame rear cover, one end of the connecting pipe is fixedly connected with the frame front cover, the other end of the connecting pipe is fixedly connected with the frame rear cover, the connecting pipe is connected with the frame front cover and the frame rear cover to form a sealing groove, and a chain is arranged in the sealing groove; a chain pressing wheel and a front chain wheel are arranged in the frame front cover, a flywheel and a rear chain wheel are arranged in the frame rear cover, the chain is arranged on the outer wall of the chain pressing wheel and the outer wall of the flywheel in a sleeving mode, and the outer wall of the front chain wheel and the outer wall of the rear chain are both meshed with the outer wall of the chain. According to the embodiment of the utility model, the chain is completely positioned in the sealing groove, so that the chain is not easy to rust. By arranging the front chain wheel and the rear chain wheel, the whole transmission mechanism of the bicycle can be smaller, and the bicycle can be lighter and more miniaturized.

Description

TECHNICAL FIELD

[0001] The utility model relates to a bicycle technical field especially relates to a transmission mechanism of bicycle. BACKGROUND

[0002] The existing bicycle on the market is usually the crank connecting toothed disc connected with the pedal, the toothed disc is equipped with the chain, and the chain transmission is given to the freewheel, the freewheel is connected to the rear wheel, so as to realize transmission, but this bicycle does not make additional protection structure to the chain, and the chain is easy to be dirty or rusted.In addition, in order to obtain larger transmission efficiency, the gear ratio of the toothed disc and the freewheel is larger, which makes the volume of the toothed disc larger, and is not conducive to the lightness and miniaturization of the bicycle. SUMMARY

[0003] Therefore, the utility model provides a transmission mechanism of bicycle for solving the problem that the bicycle in the prior art is not light and small, and the chain is easy to rust.

[0004] To achieve one or part or all of the above purposes or other purposes, the application provides a transmission mechanism of bicycle, which comprises a frame front cover, a connecting pipe and a frame rear cover.

[0005] One end of the connecting pipe is fixedly connected with the frame front cover, and the other end is fixedly connected with the frame rear cover, the connecting pipe is connected with the frame front cover and the frame rear cover to form a sealed groove, and a chain is arranged in the sealed groove.

[0006] The frame front cover is provided with a chain wheel and a front sprocket, the frame rear cover is provided with a freewheel and a rear sprocket, the chain is sleeved on the outer wall of the chain wheel and the outer wall of the freewheel, and the outer wall of the front sprocket and the outer wall of the rear sprocket are engaged with the outer wall of the chain.

[0007] Further, the frame front cover is composed of a left front cover and a right front cover, the frame rear cover is composed of a left rear cover and a right rear cover, the outer side of the left rear cover is used for connecting with the frame of the bicycle, and the side wall of one end of the connecting pipe close to the frame front cover is connected with a fixed plate, and the fixed plate is used for connecting with the frame of the bicycle.

[0008] Further, the front sprocket and the rear sprocket are arranged on one side close to the connecting pipe, the diameter of the front sprocket is smaller than that of the chain wheel, and the diameter of the rear sprocket is smaller than that of the freewheel.

[0009] Further, the inner side wall of the freewheel is provided with annularly distributed teeth, the freewheel is movably connected with a one-way wheel through the teeth, and the one-way wheel is used for connecting the rotating shaft of the rear wheel of the bicycle.

[0010] Further, the one-way wheel comprises a transmission rod, a ratchet part arranged on the transmission rod and engaged with the tooth, and a plurality of elastic members arranged one by one with the ratchet part.

[0011] Further, the flywheel is sleeved with an outer bearing, and the flywheel is provided with a first inner bearing and a second inner bearing between the flywheel and the transmission rod, the first inner bearing is arranged at one end of the transmission rod, and the second inner bearing is arranged at the other end of the transmission rod.

[0012] Further, the outer side of the frame rear cover is provided with a fixing ring, the fixing ring is arranged outside the transmission rod, is inserted with the frame rear cover and forms an accommodating groove, and the accommodating groove is provided with an O-shaped first fixing ring.

[0013] Further, the sprocket is provided with a connecting bolt for connecting a speed adjusting mechanism of the bicycle, and the sprocket is provided with a flat washer between the sprocket and the connecting bolt.

[0014] Further, the outer side of the frame front cover is provided with a bearing sleeve, the bearing sleeve is provided with an O-shaped second fixing ring outside, the bearing sleeve is provided with a front bearing inside, and the front bearing is used for connecting a speed adjusting mechanism of the bicycle.

[0015] Further, the inner side wall of the bearing sleeve is provided with a fixing groove, the fixing groove is provided with an O-shaped third fixing ring, and the third fixing ring is used for sleeving on the speed adjusting mechanism of the bicycle.

[0016] The embodiment of the utility model is implemented, and the following beneficial effects are obtained:

[0017] The transmission mechanism of the bicycle is provided, the frame front cover, the frame rear cover and the connecting pipe are spliced to form a sealed groove, so that the chain is completely located in the sealed groove, the chain does not contact water or dirt during driving, and rust is not easy to occur. In addition, by arranging the front sprocket and the rear sprocket, the distance between the chains is reduced without affecting the transmission efficiency, so that the overall transmission mechanism of the bicycle can be smaller, which is beneficial to the lightness and miniaturization of the bicycle. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0019] Among them:

[0020] Figure 1 Structure diagram of an embodiment of the transmission mechanism of the bicycle proposed in the present application provided on the bicycle;

[0021] Figure 2 Structure diagram of an embodiment of the transmission mechanism of the bicycle proposed in the present application provided on the bicycle;

[0022] Figure 3 Structure diagram of an embodiment of the transmission mechanism of the bicycle proposed in the present application provided on the bicycle;

[0023] Figure 4 Structure diagram of an embodiment of the transmission mechanism of the bicycle proposed in the present application provided on the bicycle; Figure 3 Structure diagram of an embodiment of the transmission mechanism of the bicycle proposed in the present application provided on the bicycle; Structure diagram of an embodiment of the transmission mechanism of the bicycle proposed in the present application provided on the bicycle;

[0024] Structure diagram of an embodiment of the transmission mechanism of the bicycle proposed in the present application provided on the bicycle; Figure 5 Structure diagram of an embodiment of the transmission mechanism of the bicycle proposed in the present application provided on the bicycle; Figure 3 Structure diagram of an embodiment of the transmission mechanism of the bicycle proposed in the present application provided on the bicycle; Structure diagram of an embodiment of the transmission mechanism of the bicycle proposed in the present application provided on the bicycle;

[0025] Structure diagram of an embodiment of the transmission mechanism of the bicycle proposed in the present application provided on the bicycle; Figure 6 Structure diagram of an embodiment of the transmission mechanism of the bicycle proposed in the present application provided on the bicycle; Structure diagram of an embodiment of the transmission mechanism of the bicycle proposed in the present application provided on the bicycle;

[0026] Structure diagram of an embodiment of the transmission mechanism of the bicycle proposed in the present application provided on the bicycle; Figure 7 Structure diagram of an embodiment of the transmission mechanism of the bicycle proposed in the present application provided on the bicycle; Structure diagram of an embodiment of the transmission mechanism of the bicycle proposed in the present application provided on the bicycle;

[0027] Structure diagram of an embodiment of the transmission mechanism of the bicycle proposed in the present application provided on the bicycle; Figure 8 Structure diagram of an embodiment of the transmission mechanism of the bicycle proposed in the present application provided on the bicycle; Structure diagram of an embodiment of the transmission mechanism of the bicycle proposed in the present application provided on the bicycle;

[0028] Structure diagram of an embodiment of the transmission mechanism of the bicycle proposed in the present application provided on the bicycle; Figure 9 Structure diagram of an embodiment of the transmission mechanism of the bicycle proposed in the present application provided on the bicycle; Structure diagram of an embodiment of the transmission mechanism of the bicycle proposed in the present application provided on the bicycle;

[0029] Structure diagram of an embodiment of the transmission mechanism of the bicycle proposed in the present application provided on the bicycle; Structure diagram of an embodiment of the transmission mechanism of the bicycle proposed in the present application provided on the bicycle;

[0030] 1, frame front cover; 11, chain pressing wheel; 111, connecting bolt; 112, flat washer; 12, front sprocket; 13, left front cover; 14, right front cover; 15, front connecting bearing; 16, bearing sleeve; 161, fixing groove; 17, second fixing ring; 18, third fixing ring; 19, front bearing;

[0031] 2, connecting pipe; 21, fixing plate;

[0032] 3, frame rear cover; 31, left rear cover; 32, right rear cover; 33, rear connecting bearing; 34, flywheel; 341, tooth; 342, outer bearing; 343, first inner bearing; 344, second inner bearing; 35, rear sprocket; 36, fixing ring; 37, first fixing ring;

[0033] 4, chain;

[0034] 5, one-way wheel; 51, transmission rod; 511, mounting groove; 512, concave groove; 513, right-angle groove; 52, clamping jaw; 521, connecting cylinder; 53, elastic member; 531, supporting section; 532, deforming section. DETAILED DESCRIPTION

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application; the use herein of terms such as "comprise" and "comprising", or "have" and "having", or "include" and "including" and any variations thereof, is intended to cover a non-exclusive inclusion; the use herein of terms such as "first", "second" and the like is intended to distinguish between similar objects unless otherwise specified.

[0036] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all directed to the same embodiment, or to a single alternative embodiment. It is explicitly contemplated that embodiments described herein can be combined with each other.

[0037] In order to make the technical personnel in the art better understand the scheme of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings.

[0038] Reference Figures 1 to 9 The present application provides a transmission mechanism of a bicycle, comprising a frame front cover 1, a connecting pipe 2 and a frame rear cover 3;

[0039] The connecting pipe 2 is of a hollow structure, one end of which is fixedly connected with the frame front cover 1, and the other end of which is fixedly connected with the frame rear cover 3; the connecting pipe 2, after being connected with the frame front cover 1 and the frame rear cover 3, forms a sealed groove, and a chain 4 is arranged in the sealed groove;

[0040] The frame front cover 1 is internally provided with a chain pressing wheel 11 and a front chain wheel 12, and the frame rear cover 3 is internally provided with a freewheel 34 and a rear chain wheel 35; the chain 4 is sleeved on the outer wall of the chain pressing wheel 11 and the outer wall of the freewheel 34, and the outer wall of the front chain wheel 12 and the outer wall of the rear chain 4 are both engaged with the outer wall of the chain 4.

[0041] Specifically, the front cover 1 of the frame is assembled from the left front cover 13 and the right front cover 14, and the rear cover 3 of the frame is assembled from the left rear cover 31 and the right rear cover 32. After assembly, the left front cover 13 and the right front cover 14 cover one end of the connecting pipe 2, and the left rear cover 31 and the right rear cover 32 cover the other end of the connecting pipe 2, forming a sealing groove. This prevents the chain 4, which is located inside the sealing groove, from coming into contact with water or dirt from the outside, thus preventing the chain 4 from rusting.

[0042] A circular groove is provided on the inner side wall of the left rear cover 31, and a rear connecting bearing 33 is provided in the groove. The rear sprocket 35 is sleeved on the rear connecting bearing 33 and is movably connected to the left rear cover 31 through the rear connecting bearing 33. Similarly, a front connecting bearing 15 is provided in the left front cover 13, and the front sprocket 12 is movably connected to the front and rear covers through the front connecting bearing 15.

[0043] The outer side of the left rear cover 31 is used to connect with the bicycle frame. A fixing plate 21 is connected to the side wall of the connecting tube 2 near the front cover 1 of the frame. The fixing plate 21 is used to connect with the bicycle frame. In different embodiments, the left rear cover 31, the connecting tube 2 or the fixing plate 21 and the bicycle frame can be integrally formed. Since the structure connected to the bicycle frame is located on the outside of the sealing groove, the above structure will not affect the sealing effect of the sealing groove.

[0044] In this embodiment, both the front sprocket 12 and the rear sprocket 35 are located on the side closest to the connecting pipe 2. The diameter of the front sprocket 12 is smaller than the diameter of the pressure sprocket 11, and the diameter of the rear sprocket 35 is smaller than the diameter of the flywheel 34. Since one end of the pressure sprocket 11 is connected to a speed regulating mechanism, the number of teeth on the pressure sprocket 11 can be equal to the number of teeth on the flywheel 34, thereby achieving higher transmission efficiency through the speed regulating mechanism. The front sprocket 12 and the rear sprocket 35 serve to limit the movement of the chain 4. In order to minimize the size and weight of the transmission mechanism, the front sprocket 12 and the rear sprocket 35 are relatively small in size, and the number of teeth can be set to be slightly less than or similar to the number of teeth of the pressure sprocket 11 or the freewheel 34. Preferably, the center position of the front sprocket 12 is lower than the center position of the pressure sprocket 11, and the center position of the rear sprocket 35 is lower than the center position of the freewheel 34, so that the upper and lower sides of the ring chain 4 can be as close as possible in the connecting tube 2 without affecting normal operation, thereby reducing the volume of the connecting tube 2 and thus reducing the volume of the entire transmission mechanism, which facilitates the lightweight and miniaturization of the bicycle.

[0045] Furthermore, in this embodiment, the sprocket 11 is connected to the output end of the bicycle's speed control mechanism, the input end of the speed control mechanism is connected to the pedals via a crank, and the freewheel 34 is connected to the bicycle's rear wheel. Specifically, the inner wall of the freewheel 34 is provided with annularly distributed teeth 341, and the freewheel 34 is movably connected to a one-way wheel 5 via the teeth 341. The one-way wheel 5 is used to connect to the axle of the bicycle's rear wheel, realizing the one-way transmission of this transmission mechanism.

[0046] The aforementioned one-way wheel 5 includes a transmission rod 51, a ratchet portion, and several elastic elements 53. The ratchet portion includes multiple pawls 52, all disposed on the transmission rod 51 and engaging with teeth 341. Each elastic element 53 corresponds to one of the ratchet portions. The transmission rod 51 has several mounting grooves 511, the shape of which matches the shape of the pawls 52. One end of each pawl 52 can rotate within the mounting groove 511, while the other end extends out of the mounting groove 511 and engages with the teeth 341. Each mounting groove 511 contains an elastic element 53 that abuts against the back of the pawl 52. The compression direction of the elastic element 53 is the same as the rotation direction of the transmission rod 51. In this embodiment, the number of teeth 341 is greater than the number of pawls 52, and preferably four pawls are used. The pawl 52 reduces weight and resistance while ensuring the rotational speed of the transmission rod 51. The teeth 341 have an inclined tooth structure, which allows the transmission rod 51 to rotate together when the flywheel 34 rotates in the forward direction by meshing with the other end of the pawl 52 through the teeth 341. However, when the transmission rod 51 rotates in the forward direction, due to the inclined tooth structure of the teeth 341, the pawl 52 is pressed by the teeth 341 and swings inward toward the mounting groove 511, thus preventing the flywheel 34 from rotating together. This achieves the unidirectional rotation effect of the flywheel 34 and the transmission rod 51.

[0047] In this embodiment, to facilitate the installation of the chuck 52 and to ensure that the other end of the chuck 52 is outside the mounting groove 511 and engages with the teeth 341 when not under force, a concave groove 512 is provided at one end of the mounting groove 511, and a right-angle groove 513 is provided at the end of the mounting groove 511 away from the concave groove 512. A connecting cylinder 521 that mates with the concave groove 512 is provided at one end of the chuck 52. Through the rotational connection between the connecting cylinder 521 and the concave groove 512, the other end of the chuck 52 can swing around the connecting cylinder 521. To ensure that the other end of the chuck 52 is outside the mounting groove 511, the elastic element 53 is an L-shaped spring sheet. The L-shaped spring sheet includes a support section 531 and a deformation section 532. The support section 531 is attached to... The L-shaped spring is fixed in the right-angle groove 513, and the deformable section 532 fits against the back of the claw 52. The angle between the deformable section 532 and the support section 531 is 60 degrees. The acute angle between 50 and 90 degrees ensures both the elasticity of the deformable section 532 and the support effect of the L-shaped spring on the claw 52. Under the action of the spring, the stability of the L-shaped spring is improved by the tight fit between the support section 531 and the right-angle groove 513. The L-shaped spring also reduces the processing of the claw 52 and the mounting groove 511, improving the overall structural strength. In this embodiment, the L-shaped spring is made of precision forged steel, which has high strength and elasticity. In other embodiments, the elastic element 53 can also be a compression spring or other elastic structure.

[0048] In addition, an outer bearing 342 is fitted on the outer side of the flywheel 34. A first inner bearing 343 and a second inner bearing 344 are provided between the flywheel 34 and the drive rod 51. The first inner bearing 343 is located at one end of the drive rod 51, and the second inner bearing 344 is located at the other end of the drive rod 51. A ratchet portion is spaced between the first inner bearing 343 and the second inner bearing 344. Through the cooperation of the first inner bearing 343 and the second inner bearing 344, the transmission between the flywheel 34 and the drive rod 51 is more stable, and the drive rod 51 can rotate stably within the flywheel 34, avoiding axial misalignment. The outer bearing 342 is located between the flywheel 34 and the left rear cover 31, making the connection between the flywheel 34 and the frame rear cover 3 more stable and preventing the bicycle frame from affecting the installation of the flywheel 34. A retaining ring 36 is provided on the outer side of the frame rear cover 3. The retaining ring 36 is connected to the outer side of the drive rod 51, inserts into the frame rear cover 3, and forms a receiving groove. An O-shaped first retaining ring 37 is provided in the receiving groove. The first fixing ring 37 is a wire spring structure, which can stabilize the assembly between the fixing ring 36 and the transmission rod 51. The wire spring is very light, which can reduce the weight of the transmission mechanism while ensuring tightness. The structure and function of the second fixing ring 17 and the third fixing ring 18 described below are similar.

[0049] In this embodiment, a connecting bolt 111 is provided inside the sprocket 11. The connecting bolt 111 is used to connect the bicycle's speed control mechanism. A flat washer 112 is provided between the sprocket 11 and the connecting bolt 111. The flat washer 112 is O-shaped, which can achieve a sealed connection between the sprocket 11 and the connecting bolt 111. The inner side of the sprocket 11 is provided with a toothed structure for meshing with the output shaft of the speed control mechanism. The output shaft of the speed control mechanism can drive the sprocket 11 to rotate through the toothed structure, and then transmit the power to the freewheel 34 through the chain 4.

[0050] In addition, a front bearing sleeve 16 is provided on the outer side of the frame front cover 1. A second O-ring 17 is provided on the outside of the front bearing sleeve 16, and a front bearing 19 is provided inside the front bearing sleeve 16. The front bearing 19 is used to connect the output shaft of the bicycle's speed control mechanism. The second fixing ring 17 makes the connection between the front bearing sleeve 16, the front bearing 19, and the output shaft more secure. A fixing groove 161 is provided on the inner wall of the front bearing sleeve 16, and a third O-ring 18 is provided in the fixing groove 161. The third fixing ring 18 is used to fit onto the output shaft of the bicycle's speed control mechanism. The third fixing ring 18 provides axial restraint to the output shaft, making the assembly between the output shaft and the sprocket 11 more stable and preventing the output shaft from shifting during transmission.

[0051] Obviously, the embodiments described above are only some embodiments of this application, not all embodiments. The accompanying drawings show preferred embodiments of this application, but do not limit the patent scope of this application. This application can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this application's specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the scope of patent protection of this application.

Claims

1. A transmission mechanism for a bicycle, characterized in that, Includes the front cover of the frame, connecting tubes, and the rear cover of the frame; One end of the connecting pipe is fixedly connected to the front cover of the frame, and the other end is fixedly connected to the rear cover of the frame. After the connecting pipe is connected to the front cover and the rear cover of the frame, a sealing groove is formed, and a chain is provided in the sealing groove. The front cover of the frame is provided with a pressure sprocket and a front sprocket, and the rear cover of the frame is provided with a flywheel and a rear sprocket. The chain is sleeved on the outer wall of the pressure sprocket and the outer wall of the flywheel. The outer walls of the front sprocket and the rear sprocket are both engaged with the outer wall of the chain.

2. The transmission mechanism of the bicycle according to claim 1, characterized in that, The front cover of the frame is assembled from a left front cover and a right front cover, and the rear cover of the frame is assembled from a left rear cover and a right rear cover. The outer side of the left rear cover is used to connect with the frame of the bicycle. A fixing plate is connected to one end of the connecting tube near the front cover of the frame, and the fixing plate is used to connect with the frame of the bicycle.

3. The transmission mechanism of the bicycle according to claim 1, characterized in that, Both the front sprocket and the rear sprocket are located on the side close to the connecting pipe. The diameter of the front sprocket is smaller than the diameter of the pressure sprocket, and the diameter of the rear sprocket is smaller than the diameter of the flywheel.

4. The transmission mechanism of the bicycle according to claim 1, characterized in that, The flywheel has annularly distributed teeth on its inner sidewall, and a one-way wheel is movably connected to the flywheel through the teeth. The one-way wheel is used to connect to the axle of the bicycle's rear wheel.

5. The transmission mechanism of the bicycle according to claim 4, characterized in that, The one-way wheel includes a drive rod, a ratchet portion, and several elastic elements. The ratchet portion is disposed on the drive rod and meshes with the teeth. The elastic elements are disposed correspondingly to the ratchet portion.

6. The transmission mechanism of the bicycle according to claim 5, characterized in that, An outer bearing is fitted on the outer side of the flywheel, and a first inner bearing and a second inner bearing are provided between the flywheel and the transmission rod. The first inner bearing is located at one end of the transmission rod, and the second inner bearing is located at the other end of the transmission rod.

7. The transmission mechanism of the bicycle according to claim 5, characterized in that, A fixing ring is provided on the outer side of the frame rear cover. The fixing ring is located on the outer side of the transmission rod, and is inserted into the frame rear cover to form a receiving groove. An O-shaped first fixing ring is provided in the receiving groove.

8. The transmission mechanism of the bicycle according to claim 1, characterized in that, The sprocket has a connecting bolt inside, which is used to connect the bicycle's speed adjustment mechanism. A flat washer is provided between the sprocket and the connecting bolt.

9. The transmission mechanism of the bicycle according to claim 8, characterized in that, A bearing sleeve is provided on the outer side of the front cover of the frame. A second fixing ring with an O-shape is provided on the outside of the bearing sleeve. A front bearing is provided inside the bearing sleeve. The front bearing is used to connect the speed adjustment mechanism of the bicycle.

10. The transmission mechanism of the bicycle according to claim 9, characterized in that, The inner wall of the bearing sleeve is provided with a fixing groove, and an O-shaped third fixing ring is provided in the fixing groove. The third fixing ring is used to be fitted onto the speed adjustment mechanism of the bicycle.

Images