CN211442666U

CN211442666U - Novel transmission device of bicycle

Info

Publication number: CN211442666U
Application number: CN201922503276.2U
Authority: CN
Inventors: 雷闽瑞; 黄依婷; 陈煦煦; 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 novel transmission device of a bicycle, which comprises a reverse double-crank mechanism and an acceleration and direction-changing mechanism, the reverse double-crank mechanism comprises a driving crank, a connecting rod, a driven crank and a rack, the speed-increasing and direction-changing mechanism comprises an inner gear, an idler gear and an outer gear, one end of the driving crank is fixedly connected with the middle shaft, the other end of the driving crank is provided with a screw hole which is in threaded connection with a first pin shaft, the excircle of the first pin shaft is hinged with a connecting rod, the end part of the first pin shaft is provided with an axial screw hole which is in threaded connection with a pedal, the other end of the connecting rod is hinged with the end surface of the inner gear, the hinge point and the rotation center point of the inner gear form a driven crank, the outer side of the idler wheel is meshed with the inner gear, the inner side of the idler wheel is meshed with the outer gear, the inner gear drives the outer gear to rotate through the idler wheel, the gear ratio of the gear is more than that of the outer gear, and the inner hole of the outer gear is connected with the hub of the rear wheel through an overrunning clutch. By adopting the structure, the transmission of the rear wheel and the pedal in the same direction, without dead points and acceleration is realized by changing the direction twice.

Description

Novel transmission device of bicycle

Technical Field

The utility model relates to a bicycle, concretely relates to novel transmission of 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.

Therefore, the present invention is expected to provide a chainless bicycle to overcome the above-mentioned drawbacks of the prior chainless bicycle, and the transmission is one of the key technologies.

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.

The utility model provides a shortcoming and not enough to current chainless bicycle technique, the utility model provides a can realize can rotate in succession and can the drive mechanism of acceleration rate again.

In order to achieve the above object, the utility model provides a novel transmission of bicycle, its characterized in that: the reverse double-crank mechanism comprises a driving crank, a connecting rod, a driven crank and a rack, wherein a square hole is formed in the end A of the driving crank and fixedly connected with the square head of a 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 meshing gear pair, the connecting rod is arranged on the outer sides of the driving crank and the inner gear, one end of the connecting rod is hinged to the end B of the driving crank through a first pin shaft, the other end of the connecting rod is hinged to the end face of the inner gear through a second pin shaft, a hinged point C of the inner gear and the connecting rod and the rotation central point D of the inner gear form the driven crank, the driving crank and the driven crank are equal in length, and, one end of the fixed support frame is provided with a round hole, the other end of the fixed support frame is provided with a boss, and an inner hole of the inner gear is hinged with the outer circle of the boss of the fixed support frame through a rolling bearing.

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 boss axis direction of fixed stay frame be equipped with the square hole, the square hole cooperate the rigid coupling with the square head 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 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 constitution 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 hub of the rear wheel, the outer gear is automatically jointed, and the connecting sleeve is driven to rotate by the inner ratchet wheel and the pawl, so that the hub of the rear wheel rotates; when the rotation speed of the external gear is less than that of the rear wheel hub or the rotation directions of the external gear and the rear wheel hub are opposite, the external gear and the rear wheel hub are automatically separated, and the pawls slide over the tooth surfaces of the teeth of the internal ratchet wheel, so that the original rotation of the rear wheel 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 fork of back 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 and the nut axially position the idler wheel, the sliding friction of the rolling bearing is changed into rolling friction, the friction force is small, and the idler wheel can rotate more easily; the frame is 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 arranged on the first pin shaft, the pedal plate rotates to drive the connecting rod to rotate, and the connecting rod cannot be blocked in the process of 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.

Drawings

FIG. 1 is a schematic view of a chainless bicycle according to the present invention;

FIG. 2 is a schematic view of the present invention applied to a chainless bicycle transmission;

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. 2, 3, 4, 5, 6, and 7, the present invention provides a novel transmission device for a bicycle, comprising a reverse double crank mechanism 21 and a speed-increasing and direction-changing mechanism 22, wherein 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 to be fixedly connected with the square head of a middle shaft 4, the speed-increasing and direction-changing mechanism 22 comprises an internal gear 221, an idle gear 222, an external gear 223, and a fixed support 224, the outer side of the idle gear 222 forms an internal gear pair with the internal gear 221, the inner side forms an external gear pair with the external gear 223, the connecting rod 212 is arranged at the outer sides of the

driving cranks

211 and 221, one end is hinged with the end B of the driving crank 211 through a first pin 215, the other end is hinged with the end face of the internal gear 221 through a second pin 216, and the hinge point C of the internal gear 221 and the hinge point, the length of initiative crank 211 and driven crank 213 equal, the length of connecting rod 212 and frame 214 equals and nonparallel, 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, the hole of internal gear 221 pass through the boss 2241 excircle of antifriction bearing and fixed support frame 224 and articulate. 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 the boss 2241 axis direction of fixed stay 224 be equipped with the square hole, the square hole and rear axle 5's square head cooperation rigid coupling. 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 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 tooth equipartition on outer gear 223 interior pore wall, the terminal surface of inner and adapter sleeve 63 of pawl 62 articulated, 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 the side of pawl 62, adapter sleeve 63 hole set up internal thread and back wheel hub 321's external screw thread constitution threaded connection. 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 rear hub 321 are automatically separated, and the pawls 62 slide over the tooth surfaces of the internal ratchet 61, 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 fixed stay 224 the round hole and with jump ring 226 rigid coupling, the other end passes the radial through-hole of tip under antifriction bearing hole, sleeve 228 and the back right fork 142 in proper order to it is fixed with the nut spiro union. By adopting the structure, the third pin shaft 225 is fixed, the idler pulley 222 can rotate around the third pin shaft 225, the sleeve 227 and the nut enable the idler pulley 222 to be axially positioned, the rolling bearing changes sliding friction into rolling friction, the friction force is small, and the idler pulley 222 can rotate more easily; the frame 1 is 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, the pedal 217 rotates to drive the connecting rod 212 to rotate, and the connecting rod 212 cannot be blocked in the process of 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.

As shown in fig. 1, the present invention is applied to a specific technical solution of a chainless bicycle, comprising a frame 1, a transmission device 2 and a wheel 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, the transmission device 2 comprises a reverse double crank mechanism 21 and a speed-increasing steering mechanism 22, the wheel 3 comprises a front wheel 31 and a rear wheel 32, a circular hole is arranged at the joint of the lower tube 12 and the vertical tube 13 and is hinged with the excircle of a middle shaft 4, the rear upper fork 14 comprises a left rear upper fork 141 and a right rear upper fork 142, the rear lower fork 15 comprises a left rear lower fork 151 and a right rear lower fork 152, a connecting hole is arranged at the joint of the left rear upper fork 141 and the left rear lower fork 151 and is fixedly connected with one end of a rear shaft 5, a radial through hole is arranged at the middle lower portion of the right rear upper fork 142 and a radial through hole is arranged at the end portion of the right rear lower fork 152, and is fixedly connected through screws, and the transmission device 2 is arranged on the right outer side of the frame 1. By adopting the structure, the transmission device 2 is not only beneficial to installation, but also beneficial to flexible operation of the whole transmission system without being blocked.

Claims

1. A novel transmission device of a bicycle is characterized in that: the reverse double-crank mechanism comprises a driving crank, a connecting rod, a driven crank and a rack, wherein a square hole is formed in the end A of the driving crank and fixedly connected with the square head of a 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 meshing gear pair, the connecting rod is arranged on the outer sides of the driving crank and the inner gear, one end of the connecting rod is hinged to the end B of the driving crank through a first pin shaft, the other end of the connecting rod is hinged to the end face of the inner gear through a second pin shaft, a hinge joint C and the rotation central point D of the inner gear form the driven crank, the driving crank and the driven crank are equal in length, the connecting rod and, one end of the fixed support frame is provided with a round hole, the other end of the fixed support frame is provided with a boss, and an inner hole of the inner gear is hinged with the outer circle of the boss of the fixed support frame through a rolling bearing.

2. The transmission of a bicycle according to claim 1, wherein: the boss axis direction of the fixed support frame is provided with a square hole, and the square hole is fixedly connected with the square head of the rear shaft in a matching manner.

3. The transmission of a 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. The transmission of a 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 rear upper right fork in sequence and is fixedly connected with a nut in a threaded mode.

5. The transmission of a 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.