CN211442665U - a chainless bicycle - Google Patents

Abstract

The utility model discloses a chainless bicycle, including frame, reverse double crank mechanism, acceleration rate steering mechanism and wheel, reverse double crank mechanism include initiative crank, connecting rod, internal gear and frame, acceleration rate steering mechanism including internal gear, idler, external gear, initiative crank one end and axis rigid coupling, the other end be equipped with screw and first round pin axle spiro union, first round pin axle excircle articulated with the connecting rod, and tip and step board spiro union, the connecting rod other end articulated with the internal gear terminal surface, its pin joint and internal gear rotation central point form driven crank, and isometric with initiative crank, connecting rod and frame isometric, nonparallel, the idler outside mesh with the internal gear, inboard and external gear meshing, the external gear hole be connected with the rear wheel hub through overrunning clutch. By adopting the structure, the two cranks are opposite in steering and the idler wheel changes direction, so that the same-direction continuous transmission of the rear wheel and the pedal plate is realized, and the bicycle is labor-saving.

Description

a chainless bicycle

technical field

The utility model relates to a bicycle, in particular to a chainless bicycle.

Background technique

At present, most bicycle transmission devices adopt sprocket chain transmission mechanism. The technology of sprocket chain transmission mechanism is mature. The driving sprocket is installed on the central shaft, and the driven sprocket is installed on the hub of the rear wheel. The front wheel is steered and the rear wheel is driven. , The seat cushion is located in the middle, the structure is reasonable, and it is suitable for occasions with harsh environmental conditions. It also has the characteristics of long service life, strong bearing capacity, relatively large transmission, and obvious growth rate. However, after long-term use, it is easy to wear and tear. Disadvantages of jumping teeth and off-chain. In response to the phenomenon of tooth skipping and de-chaining, relevant technicians have successively designed various chainless bicycles, which can be roughly classified into the following categories: First, the sprocket chain transmission is changed to a cable tie or a timing belt, although it is not There are the phenomenon of tooth skipping and de-chaining, but the wire harness and timing belt are not suitable for occasions with harsh environmental conditions, otherwise their service life will not be long; The transmission is relatively small, the speed increase is not obvious, and it is more laborious; third, the active pedal is directly installed on the rear axle, the seat cushion is located above the rear wheel, the distance between the seat cushion and the handle becomes farther, and the front wheel becomes smaller, resulting in unreasonable structural arrangement. , can not play the advantages of traditional bicycles. Therefore, the technology of existing chainless bicycles is not very mature, and there are always problems of one kind and another.

Utility model content

Aiming at the shortcomings and deficiencies of the prior art of chainless bicycles, the utility model provides a new type of chainless bicycle, which can maintain the advantages of traditional bicycles without the phenomenon of tooth skipping and de-chaining of sprocket chain transmission.

In order to achieve the above purpose, the utility model provides a chainless bicycle, which is characterized in that it includes a frame, a transmission device and a wheel, and the frame includes an upper tube, a lower tube, a riser, and a seat fork. and the rear fork, the connection between the down tube and the seat tube is provided with a circular hole, which is hinged with the outer circle of the central axle, and the transmission device includes a reverse double crank mechanism and a speed-increasing direction change mechanism. The double crank mechanism includes an active crank, a connecting rod, a driven crank and a frame, the A-end of the active crank is provided with a square hole and is fixedly connected to the square head of the central axis, and the speed-increasing and direction-changing mechanism includes an internal A gear, an idler gear, an external gear and a fixed support frame, the outer side of the idler gear and the internal gear form an internal meshing gear pair, the inner side and the external gear form an external meshing gear pair, and the connecting rod is arranged between the driving crank and the internal gear. On the outside, one end is hinged with the B end of the driving crank through the first pin shaft, and the other end is hinged with the end face of the internal gear through the second pin shaft. The hinge point C and the rotation center point D of the internal gear form a driven crank, the driving crank The length of the driven crank is equal, and the length of the connecting rod and the frame are equal and not parallel, forming a reverse double crank mechanism ABCD. The fixed support frame is provided with a round hole at one end and a boss at the other end. The inner hole of the inner gear is hinged with the outer circle of the boss of the fixed support frame through rolling bearings, and the wheel includes a front wheel and a rear wheel.

The beneficial effect of the utility model is: by adopting the above structure, the reverse double crank mechanism ABCD can realize that the steering of the driven crank is opposite to that of the driving crank, and there is no "dead point" for continuous rotation, and at the same time, it is the second speed change mechanism for the rear speed-increasing and direction-changing mechanism. A change of direction provides conditions; the axes of the internal gear, idler and external gear are all fixed, the number of teeth of the idler does not affect the size of the transmission ratio, but changes the steering of the external gear, the number of teeth of the internal gear is more than the number of teeth of the external gear , and the internal gear is active, the external gear is driven, and the transmission ratio is greater than 1, thereby realizing the purpose of speed-up transmission, energy-saving cycling, and the same purpose of rear wheel and pedal steering.

In the present invention, the seat fork can be further arranged such that the seat fork includes a left seat fork and a right seat fork, the seat fork includes a left seat fork and a right seat fork, and the left seat fork and A connecting hole is provided at the intersection of the left rear lower fork, which is fixedly connected with one end of the rear axle.

By adopting the above-mentioned further arrangement, the square hole and the square head are matched and fixed together, so that the assembly and disassembly are convenient and the connection is reliable.

In the present invention, an overrunning clutch can be further arranged in the inner hole of the outer gear, and the overrunning clutch includes an inner ratchet, a pawl, a connecting sleeve and a spring, and the teeth of the inner ratchet are evenly distributed outside. On the inner hole wall of the gear, the inner end of the pawl is hinged with the end surface of the connecting sleeve, the outer end is in contact with the tooth surface of the inner ratchet wheel, one end of the spring is fixedly connected with the end surface of the connecting sleeve, and the other end is connected with the end surface of the pawl. The side faces are in conflict, and the inner hole of the connecting sleeve is provided with an inner thread to form a threaded connection with the outer thread of the rear wheel hub.

The above-mentioned further arrangement is adopted, and the characteristics of the overrunning clutch are used to achieve automatic engagement and disengagement, that is, when the rotational speed of the external gear is greater than the rotational speed of the rear hub, the automatic engagement is performed, and the connecting sleeve is driven to rotate by the inner ratchet and the pawl, so that the rear hub rotates; The rotation speed of the external gear is lower than the rotation speed of the rear hub or the rotation directions of the two are opposite, and the two are automatically separated, and the pawl slides over the tooth surface of the inner ratchet, which does not affect the original rotation of the rear hub.

In the present invention, the idler can be further arranged to be hinged with the journal in the middle of the third pin shaft through the rolling bearing, and one end of the third pin shaft passes through the circular hole of the fixed support frame and is fixedly connected with the circlip, The other end passes through the inner hole of the rolling bearing, the sleeve and the radial through hole of the lower end of the right seat fork in turn, and is screwed and fixed with the nut.

With the above-mentioned further arrangement, the third pin is fixed, the idler can rotate around the third pin, the sleeve makes the idler axially positioned, the rolling bearing changes the sliding friction into rolling friction, and the friction force is small, so that the idler rotates Easier; the frame is fixedly connected with the third pin, which improves the strength, rigidity and stability of the whole vehicle.

The utility model can further be configured that the inner end of the first pin shaft is provided with an outer thread to form a threaded connection with the inner thread hole of the driving crank, and the axial direction of the outer end is provided with an inner thread blind hole and the outer thread of the pedal board. A threaded connection is formed, and a journal in the middle is hinged to the connecting rod through a rolling bearing.

With the above-mentioned further arrangement, the connecting rod and the foot plate are both installed on the first pin, so that when the foot plate rotates to drive the connecting rod to move in a plane, it will not be stuck; the threaded connection is convenient for assembly and disassembly; the rolling bearing changes the sliding friction into rolling friction , the friction force is small, which makes the movement of the connecting rod easier.

The utility model can further be configured that the middle and lower part of the right rear fork is provided with a radial through hole and the end of the right rear fork is provided with a radial through hole, and is fixedly connected by screws.

Adopting the above-mentioned further arrangement is beneficial to the installation of the transmission device.

The utility model can be further configured that the transmission device is installed on the right outer side of the frame.

Adopting the above-mentioned further setting is beneficial to the flexible operation of the entire transmission system without being stuck.

Description of drawings

1 is a schematic structural diagram of a specific embodiment of the present utility model;

2 is a schematic diagram of a transmission device according to a specific embodiment of the present utility model;

Fig. 3 is the structure diagram of the reverse double crank mechanism of the specific embodiment of the utility model;

4 is a structural diagram of a speed-increasing and direction-changing mechanism of a specific embodiment of the present utility model;

5 is a structural diagram of an overrunning clutch according to a specific embodiment of the present utility model;

6 is a structural diagram of an internal gear according to a specific embodiment of the present utility model;

FIG. 7 is a structural diagram of an idler wheel according to a specific embodiment of the present invention.

Detailed ways

As shown in Figures 1, 2, 3, 4, 5, 6, and 7, the utility model provides a chainless bicycle, which includes a frame 1, a transmission device 2 and a wheel 3. The frame 1 It includes an upper tube 11, a lower tube 12, a riser 13, a rear seat fork 14 and a rear lower fork 15. The connection between the lower tube 12 and the seat tube 13 is provided with a circular hole, which is hinged with the outer circle of the central axis 4. The said The transmission device 2 includes a reverse double crank mechanism 21 and a speed-increasing direction changing mechanism 22. The reverse double crank mechanism 21 includes a driving crank 211, a connecting rod 212, a driven crank 213 and a frame 214. The The A-end of the driving crank 211 is provided with a square hole to be fixedly connected with the square head of the central shaft 4. The speed-increasing and direction-changing mechanism 22 includes an internal gear 221, an idler gear 222, an external gear 223 and a fixed support frame 224. The outside of the idler gear 222 and the internal gear 221 form an internal gear pair, and the inside and the external gear 223 form an external gear pair. The connecting rod 212 is arranged on the outside of the driving crank 211 and the internal gear 221, and one end passes through the first pin shaft. 215 is hinged with the B end of the driving crank 211, and the other end is hinged with the end face of the internal gear 221 through the second pin 216. The hinge point C and the rotation center point D of the internal gear 221 form the driven crank 213. The lengths of the driven cranks 213 are equal, and the lengths of the connecting rods 212 and the frame 214 are equal and non-parallel, forming a reverse double crank mechanism ABCD21. The fixed support frame 224 is provided with a circular hole at one end and a boss at the other end. 2241, the inner hole of the inner gear 221 is hinged with the outer circle of the boss 2241 of the fixed support frame 224 through rolling bearings, and the wheel 3 includes a front wheel 31 and a rear wheel 32. With the above structure, the reverse double crank mechanism ABCD21 can realize that the steering of the driven crank 213 is opposite to that of the driving crank 211, and there is no "dead point" for continuous rotation, and at the same time, it provides a new direction change for the following speed-increasing and direction-changing mechanism 22. Conditions; the axes of the internal gear 221, the idler gear 222 and the external gear 223 are all fixed, the number of teeth of the idler gear 222 does not affect the size of the transmission ratio, but the steering of the external gear 223 is changed, and the number of teeth of the internal gear 221 is higher than that of the external gear 223. The number of teeth is large, the internal gear 221 is active, the external gear 223 is driven, and the transmission ratio is greater than 1, so that the speed-up transmission is realized, the cycling is labor-saving, and the wheel 3 and the pedal 217 turn the same purpose. With the above-mentioned further arrangement, the number of the idler pulleys 222 can be multiple, and one is preferred in the present invention, which can reduce cost and weight.

In the present invention, the seat fork 14 can be further configured to include a left seat fork 141 and a right seat fork 142, and the seat fork 15 includes a left seat fork 151 and a right seat fork 152. There is a connecting hole at the intersection of the left rear fork 141 and the left rear lower fork 151, which is fixedly connected with one end of the rear axle 5, and the boss 2241 of the fixed support frame 224 is provided with a square hole in the axial direction, which is connected with the rear axle 5. The other end of the square head is matched and fixed. By adopting the above structure, the square hole and the square head are matched and fixed, so that the assembly and disassembly are convenient and the connection is reliable.

In the present invention, an overrunning clutch 6 is further arranged in the inner hole of the external gear 223, and the overrunning clutch 6 includes an inner ratchet wheel 61, a pawl 62, a connecting sleeve 63 and a spring 64. The teeth of the ratchet wheel 61 are evenly distributed on the inner hole wall of the external gear 223. The inner end of the pawl 62 is hinged with the end surface of the connecting sleeve 63, the outer end is in contact with the tooth surface of the inner ratchet wheel 61, and one end of the spring 64 is connected to The end surface of the sleeve 63 is fixedly connected, and the other end is in contact with the side surface of the pawl 62 . The inner hole of the connecting sleeve 63 is provided with an inner thread to form a threaded connection with the outer thread of the rear wheel hub 321 . With the above structure, the characteristics of the overrunning clutch 6 are used to achieve automatic engagement and separation, that is, when the rotational speed of the external gear 223 is greater than the rotational speed of the rear hub 321, it is automatically engaged, and the inner ratchet 61 and the pawl 62 drive the connecting sleeve 63 to rotate, so that the The rear wheel hub 321 rotates; when the rotation speed of the external gear 223 is less than the rotation speed of the rear wheel hub 321 or the two rotation directions are opposite, they are automatically separated, and the pawl 62 slides over the tooth surface of the inner ratchet wheel 611, which does not affect the original rotation of the rear wheel hub 321 . With the above-mentioned further arrangement, the number of the pawls 62 and the springs 64 can be one, two or more, preferably two in the present invention, on the one hand, it is to balance the force and improve the stability of the transmission, and on the other hand, it is to make the The structure is as simple as possible.

In the present invention, the idler wheel 222 can be hingedly connected with the middle journal of the third pin shaft 225 through rolling bearings, and one end of the third pin shaft 225 passes through the circular hole of the fixed support frame 224 and is connected with the clamping The spring 226 is fixedly connected, and the other end passes through the inner hole of the rolling bearing, the sleeve 227 and the radial through hole of the lower end of the right seat fork 142 in sequence, and is screwed and fixed with the nut. With the above structure, the third pin 225 is fixed, the idler 222 can rotate around the third pin 225, the sleeve 227 axially locates the idler 222, the rolling bearing changes the sliding friction into rolling friction, and the frictional force is small , so that the idler 222 rotates more easily; the frame 1 is fixedly connected with the third pin 225, which improves the strength, rigidity and stability of the whole vehicle.

In the present invention, the inner end of the first pin shaft 215 is further provided with an outer thread to form a threaded connection with the inner thread hole of the driving crank 211, and an inner thread blind hole and the pedal plate 217 are arranged at the axial direction of the outer end. The external thread of the shaft constitutes a threaded connection, and a journal in the middle is hinged to the connecting rod 212 through a rolling bearing. With the above structure, the connecting rod 212 and the foot plate 217 are installed on the first pin shaft 215, so that when the foot plate 217 rotates to drive the connecting rod 212 to move in a plane, it will not be stuck; the threaded connection is convenient for assembly and disassembly; the rolling bearing will slide friction It becomes rolling friction, and the friction force is small, which makes the movement of the connecting rod 212 easier.

In the present invention, the middle and lower part of the right rear fork 142 is further provided with a radial through hole and the end of the right rear fork 152 is provided with a radial through hole, and is fixedly connected by screws. The above structure is advantageous for the installation of the transmission device 2 .

The present invention can further be configured that the transmission device 2 is installed on the right outer side of the vehicle frame 1 . The above structure is beneficial to the flexible operation of the entire transmission system without being stuck.

Claims (7)

1. A bicycle without chain is characterized in that: comprising a frame, a transmission device and a wheel, and the frame includes an upper tube, a lower tube, a riser, a seat fork and a chain fork, and the described The connection between the down tube and the riser is provided with a circular hole, which is hinged with the outer circle of the central axis. The transmission device includes a reverse double crank mechanism and a speed-increasing direction changing mechanism. The reverse double crank mechanism includes an active crank, Connecting rod, driven crank and frame, the A-end of the driving crank is provided with a square hole to be fixedly connected with the square head of the central shaft, and the speed-increasing and direction-changing mechanism includes an internal gear, an idler gear, an external gear and The support frame is fixed, the outer side of the idle gear and the inner gear form an internal meshing gear pair, the inner side and the external gear form an external meshing gear pair, the connecting rod is arranged on the outer side of the driving crank and the inner gear, and one end passes through the first pin shaft It is hinged with the B end of the driving crank, the other end is hinged with the end face of the internal gear through the second pin shaft, the hinge point C and the rotation center point D of the internal gear form a driven crank, and the length of the driving crank and the driven crank are equal, The lengths of the connecting rod and the frame are equal and not parallel to form a reverse double crank mechanism ABCD. The fixed support frame is provided with a circular hole at one end and a boss at the other end. The inner hole of the internal gear passes through the rolling bearing. The wheel is hinged with the outer circle of the boss of the fixed support frame, and the wheel includes a front wheel and a rear wheel. 2 . The chainless bicycle according to claim 1 , wherein the seat fork includes a left seat fork and a right seat fork, and the chain fork includes a left seat fork and a right seat fork 3 . The rear lower fork is provided with a connecting hole at the intersection of the left rear upper fork and the left rear lower fork, which is fixedly connected with one end of the rear axle, and the boss of the fixed support frame is provided with a square hole in the axial direction, which is connected with the rear axle. The other end is provided with a square head for fixed connection. 3. A chainless bicycle according to claim 1, characterized in that: the inner hole of the external gear is provided with an overrunning clutch, and the overrunning clutch comprises an inner ratchet, a pawl, a connecting sleeve and a spring The teeth of the inner ratchet are evenly distributed on the inner hole wall of the outer gear, the inner end of the pawl is hinged with the end face of the connecting sleeve, the outer end is in contact with the tooth surface of the inner ratchet, and one end of the spring is connected to the The end face of the sleeve is fixedly connected, and the other end is in contact with the side surface of the pawl, and the inner hole of the connecting sleeve is provided with an inner thread to form a threaded connection with the outer thread of the rear wheel hub. 4 . The chainless bicycle according to claim 1 , wherein the idle wheel is hinged with the middle journal of the third pin shaft through a rolling bearing, and one end of the third pin shaft passes through the fixed support. 5 . The round hole of the frame is fixedly connected with the circlip, and the other end passes through the inner hole of the rolling bearing, the sleeve and the radial through hole of the lower end of the right seat fork in turn, and is screwed and fixed with the nut. 5. A bicycle without a chain according to claim 1, wherein the inner end of the first pin is provided with an outer thread to form a threaded connection with the inner thread hole of the driving crank, and the axis direction of the outer end is A blind hole with an inner thread forms a threaded connection with the outer thread of the pedal board, and a journal in the middle is hinged with the connecting rod through a rolling bearing. 6 . The chainless bicycle according to claim 2 , wherein the middle and lower part of the right chainstay is provided with a radial through hole and the end of the right chainstay is provided with a radial through hole. 7 . , and fastened with screws. 7 . The bicycle without chain according to claim 1 , wherein the transmission device is installed on the right outer side of the frame. 8 .

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