CN211442665U

CN211442665U - Chainless bicycle

Info

Publication number: CN211442665U
Application number: CN201922503275.8U
Authority: CN
Inventors: 郑思鹏; 林扬光; 蔡俊磊; 吴俊演; 蔡少波; 陈崇炯
Original assignee: Wenzhou Polytechnic
Current assignee: Wenzhou Polytechnic
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2020-09-08
Anticipated expiration: 2029-12-26

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

Chainless bicycle

Technical Field

The utility model relates to a bicycle, concretely relates to chainless bicycle.

Background

At present, most bicycle transmission devices adopt a chain wheel and chain transmission mechanism, the chain wheel and chain transmission mechanism is mature in technology, a driving chain wheel is installed on a middle shaft, a driven chain wheel is installed on a hub of a rear wheel, a front wheel steering wheel, a rear wheel driving wheel and a seat cushion are positioned in the middle, the bicycle transmission device is reasonable in structural arrangement, is suitable for occasions with severe environmental conditions, and has the characteristics of long service life, strong bearing capacity, large transmission, obvious acceleration and the like. Aiming at the phenomena of tooth jumping and chain dropping, related technicians design various bicycles without chains in sequence, which are roughly summarized as the following types: firstly, the chain wheel and chain transmission is changed into a wire harness or a synchronous belt, although the phenomena of tooth jumping and chain dropping do not exist, the wire harness and the synchronous belt are not suitable for occasions with severe environmental conditions, otherwise the service life of the wire harness and the synchronous belt is not long; secondly, the chain wheel and chain transmission is changed into conical gear transmission, and due to the limitation of space, the transmission is small, the speed increase is not obvious, and the labor is wasted; third, the driving pedal is directly mounted on the rear axle, the seat cushion is located above the rear wheel, the distance between the seat cushion and the handle becomes far away, the front wheel becomes small, the structural arrangement is unreasonable, and the advantages of the traditional bicycle cannot be exerted. Therefore, the technology of the existing chainless bicycle is not mature, and the problems are always existed.

SUMMERY OF THE UTILITY MODEL

The utility model provides a novel no chain bicycle, can keep the advantage of traditional bicycle, do not have sprocket chain driven phenomenon of jumping tooth, chain derailment again to the shortcoming and not enough of no chain bicycle prior art.

In order to achieve the above object, the utility model provides a chainless bicycle, its characterized in that: the bicycle comprises a bicycle frame, a transmission device and wheels, wherein the bicycle frame comprises an upper pipe, a lower pipe, a vertical pipe, a rear upper fork and a rear lower fork, a round hole is formed in the joint of the lower pipe and the vertical pipe and is hinged with the excircle of a center shaft, the transmission device comprises a reverse double-crank mechanism and a speed-increasing and direction-changing mechanism, the reverse double-crank mechanism comprises a driving crank, a connecting rod, a driven crank and a frame, a square hole is formed in the end A of the driving crank and fixedly connected with the square head of the center shaft, the speed-increasing and direction-changing mechanism comprises an inner gear, an idler wheel, an outer gear and a fixed support frame, the outer side of the idler wheel and the inner gear form an inner meshing gear pair, the inner side of the idler wheel and the outer gear form an outer gear pair, the connecting rod is arranged on the outer sides of the driving crank and the inner gear, pin joint C and the rotation central point D of internal gear form driven crank, initiative crank equal with driven crank's length, the connecting rod equals and nonparallel with the length of frame, has constituted reverse double crank mechanism ABCD, fixed bolster one end be equipped with the round hole, the other end is equipped with the boss, the hole of internal gear pass through antifriction bearing and fixed bolster's boss excircle articulated, the wheel include front wheel and rear wheel.

The utility model has the advantages that: by adopting the structure, the reverse double-crank mechanism ABCD can realize that the steering of the driven crank is opposite to that of the driving crank, has no 'dead point' and continuously rotates, and provides conditions for the next steering of the rear speed-increasing steering mechanism; the axes of the inner gear, the idler gear and the outer gear are all fixed, the number of teeth of the idler gear does not influence the size of the transmission ratio, but the steering of the outer gear is changed, the number of teeth of the inner gear is larger than that of the outer gear, the inner gear is driving, the outer gear is driven, and the transmission ratio is larger than 1, so that the speed-increasing transmission is realized, the riding is labor-saving, and the rear wheel and the pedal plate are steered to the same purpose.

The utility model discloses still can further set up to the back on the fork including left back fork and right back fork, back lower fork include left back lower fork and right back lower fork, left back upper fork and left back lower fork handing-over department be equipped with the connecting hole, with the one end fixed connection of rear axle, the boss axis direction of fixed stay frame be equipped with the square hole, be equipped with square head cooperation rigid coupling with the other end of rear axle.

By adopting the further arrangement, the square hole is matched and fixedly connected with the square head, so that the assembly and disassembly are convenient and the connection is reliable.

The utility model discloses still can further set up to the outer gear hole in be equipped with freewheel clutch, freewheel clutch including interior ratchet, pawl, adapter sleeve and spring, the teeth of a cogwheel equipartition of interior ratchet on outer gear inner hole wall, the inner of pawl articulated with the terminal surface of adapter sleeve, outer end and interior ratchet wheel flank of tooth are inconsistent, the terminal surface rigid coupling of spring one end and adapter sleeve, the other end is inconsistent with the side of pawl, the adapter sleeve hole set up internal thread and rear wheel hub's external screw thread and constitute threaded connection.

By adopting the further arrangement, the automatic connection and disconnection are achieved by utilizing the characteristics of the overrunning clutch, namely: when the rotating speed of the outer gear is greater than that of the rear hub, the outer gear is automatically jointed, and the connecting sleeve is driven to rotate through the inner ratchet wheel and the pawl, so that the rear hub rotates; when the rotation speed of the external gear is less than that of the rear hub or the rotation directions of the external gear and the rear hub are opposite, the external gear and the rear hub are automatically separated, and the pawl slides over the gear tooth surface of the internal ratchet wheel, so that the original rotation of the rear hub is not influenced.

The utility model discloses still can further set up to the idler pass through antifriction bearing and third round pin axle middle part axle journal articulated, the one end of third round pin axle pass the round hole of fixed stay frame to with the jump ring rigid coupling, the other end passes the radial through-hole of tip under antifriction bearing hole, sleeve and the right back upper fork in proper order, and fixed with the nut spiro union.

By adopting the further arrangement, the third pin shaft is fixed, the idler wheel can rotate around the third pin shaft, the sleeve enables the idler wheel to be axially positioned, the rolling bearing changes sliding friction into rolling friction, the friction force is small, and the idler wheel can rotate more easily; the frame is fixedly connected with the third pin shaft, so that the strength, the rigidity and the stability of the whole vehicle are improved.

The utility model discloses still can further set up to the inboard one end of first round pin axle be equipped with the external screw thread and constitute threaded connection with initiative articulate internal thread hole, the axis direction of outside one end is equipped with the external screw thread constitution threaded connection of internal thread blind hole and step board, the middle part is equipped with the axle journal and passes through antifriction bearing and connecting rod articulated.

By adopting the further arrangement, the connecting rod and the pedal plate are both arranged on the first pin shaft, so that the pedal plate cannot be blocked when rotating to drive the connecting rod to do planar motion; the threaded connection is convenient to assemble and disassemble; the rolling bearing changes sliding friction into rolling friction, and the friction is small, so that the movement of the connecting rod is easier.

The utility model discloses still can further set up as the middle and lower part of right back upper fork be equipped with radial through-hole and the tip of right back lower fork be equipped with radial through-hole to through the screw rigid coupling.

By adopting the further arrangement, the transmission device is convenient to mount.

The utility model discloses still can further set up as transmission install in the right side outside of frame.

By adopting the further arrangement, the flexible operation of the whole transmission system is facilitated, and the whole transmission system cannot be blocked.

Drawings

FIG. 1 is a schematic diagram of the structure of an embodiment of the present invention;

FIG. 2 is a schematic diagram of a transmission according to an embodiment of the present invention;

FIG. 3 is a block diagram of a reverse dual crank mechanism according to an embodiment of the present invention;

FIG. 4 is a structural diagram of a speed-increasing and direction-changing mechanism according to an embodiment of the present invention;

FIG. 5 is a block diagram of an overrunning clutch according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of an internal gear according to an embodiment of the present invention;

fig. 7 is a block diagram of an idler according to an embodiment of the present invention.

Detailed Description

As shown in fig. 1, 2, 3, 4, 5, 6, 7, the present invention provides a chainless bicycle, which comprises a frame 1, a transmission device 2 and wheels 3, wherein the frame 1 comprises an upper tube 11, a lower tube 12, a vertical tube 13, a rear upper fork 14 and a rear lower fork 15, a round hole is arranged at the joint of the lower tube 12 and the vertical tube 13, the round hole is hinged with the excircle of a central shaft 4, the transmission device 2 comprises a reverse double-crank mechanism 21 and a speed-increasing and direction-changing mechanism 22, the reverse double-crank mechanism 21 comprises a driving crank 211, a connecting rod 212, a driven crank 213 and a frame 214, the end a of the driving crank 211 is provided with a square hole fixedly connected with the square head of the central shaft 4, the direction-changing and speed-increasing mechanism 22 comprises an inner gear 221, an idler 222, an outer gear 223 and a fixed support frame 224, the outer side of the idler 222 and the inner gear 221 form an inner gear pair, the inner side and the outer, connecting rod 212 set up in the outside of initiative crank 211 and internal gear 221, one end is articulated through first round pin axle 215 and initiative crank 211's B end, and the other end is articulated through second round pin axle 216 and internal gear 221 terminal surface, the rotation center point D of pin joint C and internal gear 221 forms driven crank 213, initiative crank 211 equal with driven crank 213's length, connecting rod 212 equals and nonparallel with frame 214's length, has constituted reverse double crank mechanism ABCD21, fixed support frame 224 one end be equipped with the round hole, the other end is equipped with boss 2241, internal gear 221's hole pass through antifriction bearing and fixed support frame 224's boss 2241 excircle and articulate, wheel 3 include front wheel 31 and rear wheel 32. By adopting the structure, the reverse double-crank mechanism ABCD21 can realize that the steering direction of the driven crank 213 is opposite to that of the driving crank 211, and the continuous rotation without a dead point is realized, and simultaneously, a condition is provided for the next steering direction change of the rear speed-increasing and direction-changing mechanism 22; the axes of the inner gear 221, the idler gear 222 and the outer 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 outer gear 223 is changed, the number of teeth of the inner gear 221 is larger than that of the teeth of the outer gear 223, the inner gear 221 is driving, the outer gear 223 is driven, and the transmission ratio is larger than 1, so that the purposes of speed-increasing transmission, labor saving in riding and the same steering of the wheel 3 and the pedal plate 217 are achieved. With the above further arrangement, the number of the idle wheels 222 can be plural, and one idle wheel is preferable in the present invention, which can reduce the cost and weight.

The utility model discloses still can further set up as back upper fork 14 including left back upper fork 141 and right back upper fork 142, back lower fork 15 include left back lower fork 151 and right back lower fork 152, left back upper fork 141 and left back lower fork 151 handing-over department be equipped with the connecting hole, with the one end fixed connection of rear axle 5, the boss 2241 axis direction of fixed stay 224 be equipped with the square hole, with the other end square head cooperation rigid coupling of rear axle 5. By adopting the structure, the square hole is matched and fixedly connected with the square head, so that the assembly and disassembly are convenient and the connection is reliable.

The utility model discloses still can further set up to outer gear 223 hole in be equipped with freewheel clutch 6, freewheel clutch 6 including interior ratchet 61, pawl 62, adapter sleeve 63 and spring 64, interior ratchet 61's teeth of a cogwheel equipartition on outer gear 223 interior pore wall, pawl 62 the inner articulated with adapter sleeve 63's terminal surface, outer end and interior ratchet 61 flank of tooth are inconsistent, spring 64 one end and adapter sleeve 63's terminal surface rigid coupling, the other end is inconsistent with pawl 62's side, adapter sleeve 63 hole set up the external screw thread constitution threaded connection of internal thread and rear wheel hub 321. By adopting the structure, the automatic connection and disconnection are achieved by utilizing the characteristics of the overrunning clutch 6, namely: when the rotating speed of the outer gear 223 is greater than that of the rear hub 321, the outer gear is automatically jointed, and the connecting sleeve 63 is driven to rotate through the inner ratchet wheel 61 and the pawl 62, so that the rear hub 321 rotates; when the rotation speed of the external gear 223 is less than the rotation speed of the rear hub 321 or the rotation directions of the external gear and the rear hub 321 are opposite, the external gear and the external gear are automatically separated, and the pawl 62 slides over the tooth surface of the internal ratchet wheel 611, so that the original rotation of the rear hub 321 is not influenced. With the above further arrangement, the number of the pawls 62 and the springs 64 may be one, two or more, and preferably two, in the present invention, on one hand, the force balance and the stability of the transmission are improved, and on the other hand, the structure is made as simple as possible.

The utility model discloses still can further set up as idler 222 pass through antifriction bearing and third round pin axle 225 middle part axle journal articulated, third round pin axle 225 one end pass the round hole of fixed stay frame 224 to with jump ring 226 rigid coupling, the other end passes the radial through-hole of tip under antifriction bearing hole, sleeve 227 and the right back upper fork 142 in proper order, and fixed with the nut spiro union. By adopting the structure, the third pin shaft 225 is fixed, the idle wheel 222 can rotate around the third pin shaft 225, the sleeve 227 enables the idle wheel 222 to be axially positioned, the rolling bearing changes sliding friction into rolling friction, and the friction force is small, so that the idle wheel 222 can rotate more easily; the frame 1 is fixedly connected with the third pin shaft 225, so that the strength, the rigidity and the stability of the whole vehicle are improved.

The utility model discloses still can further set up to first round pin axle 215's inboard one end be equipped with the external screw thread and constitute threaded connection with the internal thread hole of initiative crank 211, the axis direction of outside one end is equipped with the external screw thread constitution threaded connection of internal thread blind hole and step board 217, the middle part is equipped with the axle journal and passes through antifriction bearing and link 212 articulated. By adopting the structure, the connecting rod 212 and the pedal 217 are arranged on the first pin shaft 215, so that the pedal 217 cannot be blocked when rotating to drive the connecting rod 212 to do planar motion; the threaded connection is convenient to assemble and disassemble; the rolling bearing changes sliding friction into rolling friction, and the friction is small, so that the connecting rod 212 moves more easily.

The utility model discloses still can further set up as right back upper fork 142 the well lower part be equipped with radial through-hole and right back lower fork 152 the tip be equipped with radial through-hole to through the screw rigid coupling. With the above structure, the transmission device 2 can be easily mounted.

The utility model discloses still can further set up as transmission 2 installs in the right side outside of frame 1. By adopting the structure, the flexible operation of the whole transmission system is facilitated, and the whole transmission system cannot be blocked.

Claims

1. A chainless bicycle characterized in that: the bicycle comprises a bicycle frame, a transmission device and wheels, wherein the bicycle frame comprises an upper pipe, a lower pipe, a vertical pipe, a rear upper fork and a rear lower fork, a round hole is formed in the joint of the lower pipe and the vertical pipe and is hinged with the excircle of a center shaft, the transmission device comprises a reverse double-crank mechanism and a speed-increasing and direction-changing mechanism, the reverse double-crank mechanism comprises a driving crank, a connecting rod, a driven crank and a frame, a square hole is formed in the end A of the driving crank and fixedly connected with the square head of the center shaft, the speed-increasing and direction-changing mechanism comprises an inner gear, an idler wheel, an outer gear and a fixed support frame, the outer side of the idler wheel and the inner gear form an inner meshing gear pair, the inner side of the idler wheel and the outer gear form an outer gear pair, the connecting rod is arranged on the outer sides of the driving crank and the inner gear, pin joint C and the rotation central point D of internal gear form driven crank, initiative crank equal with driven crank's length, the connecting rod equals and nonparallel with the length of frame, has constituted reverse double crank mechanism ABCD, fixed bolster one end be equipped with the round hole, the other end is equipped with the boss, the hole of internal gear pass through antifriction bearing and fixed bolster's boss excircle articulated, the wheel include front wheel and rear wheel.

2. A chainless bicycle according to claim 1, wherein: the back on the fork including left back on the fork and right back on the fork, back down the fork including left back under the fork and right back under the fork, left back on the fork and left back under the fork handing-over department be equipped with the connecting hole, with the one end fixed connection of rear axle, the boss axis direction of fixed stay frame be equipped with the square hole, be equipped with square head cooperation rigid coupling with the other end of rear axle.

3. A chainless bicycle according to claim 1, wherein: the outer gear hole in be equipped with freewheel clutch, freewheel clutch including interior ratchet, pawl, adapter sleeve and spring, the teeth of a cogwheel equipartition of interior ratchet on outer gear inner hole wall, the inner of pawl articulated with the terminal surface of adapter sleeve, outer end and interior ratchet wheel flank of tooth are inconsistent, spring one end and the terminal surface rigid coupling of adapter sleeve, the other end is inconsistent with the side of pawl, the adapter sleeve hole set up internal thread and rear wheel hub's external screw thread and constitute threaded connection.

4. A chainless bicycle according to claim 1, wherein: the idler wheel is hinged with a middle shaft neck of a third pin shaft through a rolling bearing, one end of the third pin shaft penetrates through a round hole of the fixed support frame and is fixedly connected with the clamp spring, and the other end of the third pin shaft penetrates through an inner hole of the rolling bearing, the sleeve and a radial through hole at the lower end part of the right rear upper fork in sequence and is fixedly connected with a nut in a threaded mode.

5. A chainless bicycle according to claim 1, wherein: the inner side end of the first pin shaft is provided with an external thread which forms threaded connection with an internal thread hole of the driving crank, an internal thread blind hole which forms threaded connection with an external thread of the pedal is arranged in the axis direction of the outer side end of the first pin shaft, and a shaft neck which is hinged with the connecting rod through a rolling bearing is arranged in the middle of the first pin shaft.

6. A chainless bicycle according to claim 2, wherein: the middle lower part of the right rear upper fork is provided with a radial through hole, and the end part of the right rear lower fork is provided with a radial through hole which are fixedly connected through screws.

7. A chainless bicycle according to claim 1, wherein: the transmission device is arranged on the right outer side of the frame.