Internal tooth direct drive bicycle

Abstract

The utility model relates to the technical field of bicycles, in particular to an internal tooth direct-drive bicycle, which is characterized in that a driving wheel, namely an internal tooth chain wheel, of the bicycle is meshed with a driven wheel, namely a flywheel, the flywheel is directly driven, the wheels are driven to rotate, and the internal tooth direct-drive bicycle comprises a frame, a handlebar, a saddle, a front wheel and a rear wheel, the tail end of the main beam is connected with a rear wheel installation frame through an installation cylinder, a middle shaft capable of rotating is coaxially arranged in the installation cylinder, cranks used for being connected with pedals are fixed to the two ends of the middle shaft, an inner tooth disc is coaxially fixed to the position, located between the installation cylinder and the crank on the right side, of the middle shaft, and a rotating rear shaft is installed at the bottom end of the rear wheel installation frame. The rear wheel is coaxially fixed to the middle of the rear shaft, and a flywheel meshed with the inner tooth disc is arranged at the end, close to the inner tooth disc, of the rear shaft. The bicycle is simple in structure, small and exquisite in size, powerful in starting, labor-saving in riding, light, fast, good in comfort and low in cost.

Description

Technical Field

[0001] The utility model relates to the technical field of bicycles, in particular to an internal gear direct drive bicycle. Background Art

[0002] The main power transmission method of traditional bicycles is: the pedals drive the chainrings, the chainrings drive the chain, and the chain drives the flywheel to rotate, thereby realizing the rotation of the wheels.

[0003] The main components of a traditional bicycle frame are: top tube, down tube, seat tube, seat fork, and chain fork. The frame is a prismatic shape formed by the overlapping adjacent hypotenuses of two triangles, one upright and one inverted.

[0004] The above-mentioned traditional bicycle has the following shortcomings:

[0005] 1. Riding is laborious: there are many transmission links and the power loss is large;

[0006] 2. Heavy body: The wheels are large, the body is long, the frame structure is complex, and the body is very heavy. For example, a 28-model traditional bicycle has a wheel diameter of 71cm, a body length of 180cm, and a total weight of 20kg.

[0007] 3. Complex system: For example, traditional speed-changing bicycles are equipped with complex speed-changing systems in order to start quickly, accelerate quickly, and travel quickly. This not only increases manufacturing costs but is also prone to failures, such as chain drops.

[0008] 4. Poor applicability: Large diameter wheels and small adjustment range of the distance between the seat and the middle axis make it unsuitable for people with large height differences. Utility Model Content

[0009] The technical problem to be solved by the utility model is to overcome the defects of the above-mentioned technology and provide an internal gear direct drive bicycle, in which the driving wheel of the bicycle is designed as an internal gear chainring, which meshes with the driven wheel, i.e., the flywheel, to directly drive the flywheel and drive the wheel to rotate.

[0010] The bicycle comprises a frame, a handlebar, a seat, a front wheel and a rear wheel, wherein the frame comprises a main beam, the handlebar and the front wheel are mounted on the front end of the main beam, the rear wheel is mounted on the rear end of the main beam, and the seat is mounted on the upper side of one end of the main beam close to the rear wheel;

[0011] The tail end of the main beam is connected to a rear wheel mounting frame for mounting the rear wheel through a center shaft tube. A rotatable center shaft is coaxially provided in the center shaft tube. Cranks for connecting to pedals are fixed at both ends of the center shaft. An internal gear chainring is coaxially fixed on the center shaft and located between the center shaft tube and the right crank.

[0012] A rotating rear axle is installed at the bottom end of the rear wheel mounting frame, the rear wheel is coaxially fixed to the middle part of the rear axle, and an eccentric flywheel meshing with an internal gear sprocket is provided at the right end of the rear axle.

[0013] Furthermore, the rear wheel mounting frame includes a left rear fork upper section and a right rear fork upper section connected to the bottom tube, a detachable left rear fork lower section is provided on the left side of the bottom end of the left rear fork upper section, and a detachable right rear fork lower section is provided on the left side of the bottom end of the right rear fork upper section, and the left rear fork lower section and the right rear fork lower section are connected to the rear axle through bearings.

[0014] Furthermore, the left rear fork upper section is located above the left rear fork lower section and is provided with an adjustment screw, and the right rear fork lower section is located below the right rear fork upper section and is provided with an adjustment screw, and the left rear fork upper section and the left rear fork lower section, as well as the right rear fork upper section and the right rear fork lower section are fixedly connected by fastening screws.

[0015] Furthermore, an insert block is provided on the left side of the bottom end of the left rear fork upper section and the left side of the bottom end of the right rear fork upper section, and a slot is provided on the right side of the top end of the left rear fork lower section and the right side of the top end of the right rear lower fork section to cooperate with the insert block;

[0016] The insert block of the upper section of the left rear fork is provided with a through screw hole, and the slot of the lower section of the left rear fork is provided with a through bar hole that matches the screw hole;

[0017] A penetrating strip hole is provided on the insert block of the upper section of the right rear fork, and a penetrating screw hole that matches the strip hole is provided on the slot of the lower section of the right rear fork.

[0018] Furthermore, the internal toothed sprocket includes a disc body, and a plurality of tooth pins are provided on the inner side of the periphery of the disc body. The tooth pins include bearings, washers and shoulder screws, and the bearings and washers are mounted on the disc body via the shoulder screws.

[0019] Advantages of the utility model: the utility model has a reasonable structure, a compact size, a simplified structure, eliminates the need for a complex speed change system, saves effort in riding, is light and fast, has good comfort, and greatly reduces manufacturing costs;

[0020] 1. Labor-saving: First, the internal gear direct drive transmission system rotates the crank, pedals, and internal gear chainring assembly, driving the flywheel and rear wheel assembly at the driven end to rotate. The friction point is only one point where the internal gear chainring and flywheel are engaged. There are no dozens of meshing friction points between the chainring and chain, and between the chain and flywheel, as in traditional bicycle transmission systems, and dozens of friction points caused by the continuous bending and straightening of the chain.

[0021] The second is to design the "teeth" of the internal gear chainring as bearings, and use shoulder screws to arrange the bearings on the wheel disc to form rotating teeth to reduce friction between the chainring and the flywheel;

[0022] The third is the small rear wheel design, which makes the crank length equal to the radius of the rear wheel, giving play to the crank's long moment arm effect, thereby increasing the driving force when the bicycle starts, playing the role of a traditional speed-shifting bicycle, where the small chainring drives the large flywheel;

[0023] 2. Fast: The internal gear chainring is designed as a "large chainring". During normal riding, it achieves the effect of a traditional speed-changing bicycle, where the large chainring drives the small flywheel to ensure the speed.

[0024] 3. Lightweight: simple design, small wheels, short body, light weight, wide range of seat height adjustment, suitable for adults and children;

[0025] 4. Cheap: The simple and lightweight design directly reduces manufacturing costs. At the same time, the entire vehicle uses a large number of standard bicycle parts and existing production and manufacturing technologies, making the already green and environmentally friendly bicycle even cheaper. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of an internal gear direct drive bicycle of the present utility model;

[0027] Figure 2 This is a schematic diagram of a frame of an internal gear direct drive bicycle of the present invention;

[0028] Figure 3 This is a schematic structural diagram of a rear wheel mounting frame for an internal gear direct drive bicycle of the utility model;

[0029] Figure 4 This is a schematic diagram of the upper section of the left rear fork of an internal gear direct drive bicycle of the present invention;

[0030] Figure 5 This is a schematic diagram of the upper section of the right rear fork of an internal gear direct drive bicycle of the present invention;

[0031] Figure 6 This is a schematic diagram of the lower section of the left rear fork of an internal gear direct drive bicycle of the present invention;

[0032] Figure 7 This is a schematic diagram of the lower section of the right rear fork of an internal gear direct drive bicycle of the present invention;

[0033] Figure 8 This is a schematic diagram of an adjustment screw for an internal gear direct drive bicycle of the utility model;

[0034] Figure 9 This is a schematic structural diagram of an internal gear chainring for an internal gear direct drive bicycle of the present invention;

[0035] Figure 10 This is a schematic diagram of an eccentric flywheel for an internal gear direct drive bicycle of the utility model;

[0036] Figure 11 This is a schematic diagram of another eccentric flywheel for an internal gear direct drive bicycle of the utility model;

[0037] Figure 12 is with Figure 11 Schematic diagram of another type of internal gear chainring with an eccentric flywheel.

[0038] As shown in the figure: 1. Main beam; 2. Bottom bracket; 3. Rear wheel mounting bracket; 4. Bottom bracket; 5. Pedals; 6. Crank; 7. Internal gear chainring; 8. Rear axle; 9. Flywheel; 10. Bearing; 11. Adjustment screw; 12. Fastening screw; 301. Left rear fork upper section; 302. Right rear fork upper section; 303. Left rear fork lower section; 304. Right rear fork lower section; 305. Insert; 306. Slot; 307. Screw hole; 308. Strip hole; 701. Plate body; 702. Gasket; 703. Shoulder screw. DETAILED DESCRIPTION

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0041] In the description of the embodiments of the present invention, if a feature is referred to as being "set", "fixed", "connected" or "installed" on another feature, it can be directly set, fixed or connected on the other feature, or it can be indirectly set, fixed, connected or installed on the other feature.

[0042] In the description of the embodiments of this utility model, if the word "several" is mentioned, it means more than one; if the word "plurality" is mentioned, it means more than two; if the word "greater than," "less than," or "exceeds," it should be understood as excluding the number itself; if the word "above," "below," or "within" is mentioned, it should be understood as including the number itself. If the word "first" or "second" is mentioned, it should be understood as distinguishing technical features and should not be understood as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0043] The present invention will be described in further detail below with reference to the accompanying drawings.

[0044] Example

[0045] like Figure 1 As shown, an internal gear direct drive bicycle includes a frame, handlebars, a seat, a front wheel and a rear wheel. The frame includes a main beam 1. The handlebars and the front wheel are mounted on the front end of the main beam 1. The rear wheel is mounted on the rear end of the main beam 1. The seat is mounted on the upper side of one end of the main beam 1 close to the rear wheel. The diameter of the rear wheel is smaller than that of the front wheel. An existing height adjustment device can be provided at the bottom of the seat to facilitate seat height adjustment. Both the front and rear wheels are equipped with existing brake devices.

[0046] like Figure 1-3 As shown, the tail end of the main beam 1 is connected to a rear wheel mounting frame 3 for mounting the rear wheel through a center tube 2. A rotatable center tube 4 is coaxially provided in the center tube 2. Cranks 6 for connecting to pedals 5 are fixed at both ends of the center tube 4. An internal gear chainring 7 is coaxially fixed on the center tube 4 and located between the center tube 2 and the right crank 6.

[0047] A rotating rear axle 8 is mounted on the bottom end of the rear wheel mounting frame 3, the rear wheel is coaxially fixed to the middle of the rear axle 8, and an eccentric flywheel 9 meshing with the internal gear sprocket 7 is provided at the right end of the rear axle 8;

[0048] The rear wheel mounting frame 3 includes a left rear fork upper section 301 and a right rear fork upper section 302 connected to the bottom end tube 2. A detachable left rear fork lower section 303 is provided on the left side of the bottom end of the left rear fork upper section 301, and a detachable right rear fork lower section 304 is provided on the left side of the bottom end of the right rear fork upper section 302. The left rear fork lower section 303 and the right rear fork lower section 304 are connected to the rear axle 8 via bearings 10.

[0049] like Figure 4-7As shown, the left rear fork upper section 301 is located above the left rear fork lower section 303 and is provided with an adjusting screw 11, and the right rear fork lower section 304 is located below the right rear fork upper section 302 and is provided with an adjusting screw 11, and the left rear fork upper section 301 and the left rear fork lower section 303, and the right rear fork upper section 302 and the right rear fork lower section 304 are fixedly connected by fastening screws 12, and the adjusting screws 11 are as shown. Figure 8 As shown;

[0050] The left side of the bottom end of the left rear fork upper section 301 and the left side of the bottom end of the right rear fork upper section 302 are both provided with an insert block 305, and the right side of the top end of the left rear fork lower section 303 and the right side of the top end of the right rear fork lower section are both provided with a slot 306 that cooperates with the insert block 305;

[0051] The insert block 305 of the left rear fork upper section 301 is provided with a through screw hole 307, and the slot 306 of the left rear fork lower section 303 is provided with a through bar hole 308 that matches the screw hole 307;

[0052] A through-hole 308 is provided on the insert block 305 of the right rear fork upper section 302 , and a through-hole 308 is provided on the slot 306 of the right rear fork lower section 304 . A through-hole 307 is provided on the screw hole 307 that matches the through-hole 308 .

[0053] like Figure 9 As shown, the internal tooth chainring 7 includes a plate body 701, and a plurality of tooth pins are provided on the inner side of the periphery of the plate body 701. The tooth pins include bearings 10, washers 702 and shoulder screws 703. The bearings 10 and washers 702 are mounted on the plate body 701 through shoulder screws 703. Here, the "tooth pins" of the internal tooth chainring are designed as bearings, and the bearings are arranged on the wheel through shoulder screws to form rotating teeth to reduce the friction between the chainring and the flywheel.

[0054] When the internal toothed sprocket 7 and the eccentric flywheel 9 of the present invention are implemented, the internal toothed sprocket 7 is provided with teeth in a semicircle, such as Figure 12 As shown, the tooth nails provided on the eccentric flywheel 9 include a bearing 10, a washer 702 and a shoulder screw 703, as shown in FIG. Figure 11 shown.

[0055] This utility model has an internal gear direct-drive bicycle with a front wheel diameter of 50 cm, a rear wheel diameter of 30 cm, an internal gear chainring diameter of 41.6 cm, a body length of 122 cm, and a total weight of 10 kg. These bicycles are 58 cm shorter and 10 kg lighter, respectively, than conventional bicycles in the 28-inch model. During riding, pedaling 5 rotates the internal gear chainring 7. The inner sides of the teeth on the periphery of the internal gear chainring 7 engage with an eccentric flywheel 9 located to the right of the rear axle, driving the eccentric flywheel 9 to rotate and thereby rotating the rear wheel. With one pedal rotation, this utility model achieves a forward travel of 610 cm, a slightly higher speed than the 596 cm travel of a 28-inch single-speed bicycle. Due to its internal gear direct-drive design and the fact that its crank length of 17 cm is greater than the 15 cm radius of the rear wheel, this bicycle offers a powerful start and a more effortless ride.

[0056] The contents not described in detail in this specification belong to the prior art known to those skilled in the art, such as the seat height adjustment device and wheel brake device mentioned in the embodiments.

[0057] The above description of the present invention and its embodiments is non-limiting. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by the above, and does not deviate from the purpose of the present invention, without inventive design, a structure and embodiment similar to the technical solution should fall within the scope of protection of the present invention.

Claims

1. An internal gear direct drive bicycle comprising a frame, handlebars, a seat, a front wheel and a rear wheel, characterized in that: The frame comprises a main beam (1), the handlebars and the front wheel are mounted on the front end of the main beam (1), the rear wheel is mounted on the rear end of the main beam (1), and the seat is mounted on the upper side of one end of the main beam (1) close to the rear wheel; The tail end of the main beam (1) is connected to a rear wheel mounting frame (3) for mounting a rear wheel via a center axis tube (2); a rotatable center axis (4) is coaxially provided in the center axis tube (2); cranks (6) for connecting to pedals (5) are fixed at both ends of the center axis (4); an inner toothed chainring (7) is coaxially fixed on the center axis (4) and located between the center axis tube (2) and the right crank (6); A rotating rear axle (8) is installed at the bottom end of the rear wheel mounting frame (3), the rear wheel is coaxially fixed to the middle of the rear axle (8), and an eccentric flywheel (9) meshing with the internal gear tooth plate (7) is provided at the right end of the rear axle (8).

2. The internal gear direct drive bicycle according to claim 1, characterized in that: The rear wheel mounting frame (3) comprises a left rear fork upper section (301) and a right rear fork upper section (302) connected to the center axis tube (2); a detachable left rear fork lower section (303) is provided on the left side of the bottom end of the left rear fork upper section (301); a detachable right rear fork lower section (304) is provided on the left side of the bottom end of the right rear fork upper section (302); and the left rear fork lower section (303) and the right rear fork lower section (304) are connected to the rear axle (8) via bearings (10).

3. The internal gear direct drive bicycle according to claim 2, characterized in that: The left rear fork upper section (301) is located above the left rear fork lower section (303) and is provided with an adjustment screw (11); the right rear fork lower section (304) is located below the right rear fork upper section (302) and is provided with an adjustment screw (11); the left rear fork upper section (301) and the left rear fork lower section (303), and the right rear fork upper section (302) and the right rear fork lower section (304) are fixedly connected by fastening screws (12).

4. The internal gear direct drive bicycle according to claim 3, characterized in that: The left side of the bottom end of the left rear fork upper section (301) and the left side of the bottom end of the right rear fork upper section (302) are both provided with an insert block (305); the right side of the top end of the left rear fork lower section (303) and the right side of the top end of the right rear fork lower section are both provided with a slot (306) that matches the insert block (305); The insert block (305) of the left rear fork upper section (301) is provided with a through screw hole (307), and the slot (306) of the left rear fork lower section (303) is provided with a through strip hole (308) that matches the screw hole (307); The insert block (305) of the upper right rear fork section (302) is provided with a through strip hole (308), and the slot (306) of the lower right rear fork section (304) is provided with a through screw hole (307) that matches the strip hole (308).

5. The internal gear direct drive bicycle according to claim 1, characterized in that: The internal toothed sprocket (7) comprises a disc body (701), a plurality of tooth pins are provided on the inner side of the periphery of the disc body (701), the tooth pins comprise bearings (10), washers (702) and shoulder screws (703), and the bearings (10) and washers (702) are mounted on the disc body (701) via the shoulder screws (703).

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