CN112678111A - Chainless bicycle transmission system - Google Patents
Chainless bicycle transmission system Download PDFInfo
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- CN112678111A CN112678111A CN202110020626.9A CN202110020626A CN112678111A CN 112678111 A CN112678111 A CN 112678111A CN 202110020626 A CN202110020626 A CN 202110020626A CN 112678111 A CN112678111 A CN 112678111A
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Abstract
The invention discloses a chainless bicycle transmission system, which comprises a driving shaft, a front fluted disc and a rear fluted disc, wherein the front fluted disc comprises an embedded fluted disc and at least one concentric ring gear arranged on the end surface of the embedded fluted disc; the rear fluted disc comprises an embedded fluted disc and at least one concentric toothed ring arranged on the end face of the embedded fluted disc; the front end of the driving shaft is provided with a front spherical tooth which is selectively meshed with a concentric ring gear arranged on a front fluted disc, the rear end of the driving shaft is provided with a rear spherical tooth which is selectively meshed with a concentric ring gear arranged on a rear fluted disc, and the front spherical tooth and rear fluted disc drive mechanism further comprises a control assembly for controlling and changing the meshing state of the rear spherical tooth and the rear fluted disc and an adjusting assembly for adjusting the relative position of the rear spherical tooth on the driving shaft. The front fluted disc, the driving shaft and the rear fluted disc are optimized, so that the friction force in a transmission system is reduced, the transmission efficiency is improved, the structure of the transmission system is simplified, the production cost is reduced, and the universality is improved.
Description
Technical Field
The invention relates to the technical field of bicycle transmission, in particular to a chainless bicycle transmission system.
Background
The bicycle is a very common tool for riding instead of walk in our daily life, the transmission system of the common bicycle adopts the chain and the chain disc to be meshed for power transmission, the traditional chain and chain disc transmission system has very large friction force at the meshing part, and the efficiency of converting the foot treading force into the driving force of the bicycle is low. Therefore, a chainless transmission system is specially and deeply researched and designed to be applied to a bicycle, so that the friction force is greatly reduced, and the power conversion efficiency is also improved. In 2018, on the German Eurobike exhibition, a chainless bicycle Criven is developed, although a plurality of friction points are reduced, the transmission efficiency reaches 99%, the bicycle is difficult to shift gears and change speed, difficult to manufacture, high in price and difficult to adapt to the market with intense competition, and batch production is not realized so far, so that the chainless bicycle with high transmission efficiency becomes a practical aerial pavilion.
Therefore, in order to solve the above problems, a chainless bicycle transmission system is needed, which can solve a series of technical problems of difficult gear shifting, difficult design, difficult production, difficult maintenance and the like of the traditional chainless bicycle.
Disclosure of Invention
In view of the above, the present invention is directed to overcome the defects in the prior art, and to provide a chainless bicycle transmission system, which can solve a series of technical problems of difficult gear shifting, difficult design, difficult production, difficult maintenance and repair, and the like of the conventional chainless bicycle.
The chainless bicycle transmission system comprises a driving shaft, a front fluted disc and a rear fluted disc, wherein the front fluted disc comprises an embedded fluted disc and at least one concentric toothed ring arranged on the end surface of the embedded fluted disc; the rear fluted disc comprises an embedded fluted disc and at least one concentric toothed ring arranged on the end face of the embedded fluted disc; the front end of the driving shaft is provided with a front spherical tooth which is meshed with a concentric ring gear arranged on a front fluted disc alternatively, the rear end of the driving shaft is provided with a rear spherical tooth which is meshed with a concentric ring gear arranged on a rear fluted disc alternatively, the bicycle driving device further comprises a control assembly for controlling and changing the meshing state of the rear spherical tooth and the rear fluted disc and an adjusting assembly for adjusting the relative position of the rear spherical tooth on the driving shaft, the number of the front spherical teeth and the number of the rear spherical teeth can be set according to the actual parameter proportion, and the number of the front spherical teeth is slightly lower than that of the rear spherical teeth in the scheme of the application (generally, the circumferential radius of the cross section of the front spherical teeth before the front retainer is installed is slightly smaller than that of the cross section of the rear spherical teeth after the rear retainer is installed, so; the spherical teeth of the invention are balls, the balls arranged on the retainer have the advantages that the friction force (similar to a universal ball structure) can be reduced to the maximum extent through universal rotation, compared with the gear structure adopted by Cdiven, the ball-like structure has the advantages that the ball-like structure can roll along the direction of the maximum friction of the transmission of the auxiliary teeth completely in the transmission process and is stressed uniformly, and the gear structure adopted by the Cdiven, the gear teeth, the bearings or the rollers (cylinders) of the gear structure can only rotate along the axial direction of the gear structure, so that the unfavorable friction of the gear structure is not reduced to the maximum extent, and the service life of the gear structure can be reduced through the friction. The ball that adopts in this scheme can be other smooth hard wear-resisting materials such as pottery, for example pottery, alloy, hard rostone etc. can increase substantially power conversion efficiency when using, and the operation is reliable, has reduced manufacturing cost.
Furthermore, the front spherical teeth are balls and are arranged at the front end of the driving shaft through a front retainer, the number of the front spherical teeth is not less than one, the rear spherical teeth are balls and are arranged at the rear end of the driving shaft through a rear retainer, the relative position of the rear retainer and the driving shaft can be adjusted through an adjusting assembly, and the number of the rear spherical teeth is not less than one.
Furthermore, the driving shaft comprises a central shaft and an empty sleeve shaft which are arranged concentrically, the empty sleeve shaft can rotate around the central shaft in a single degree of freedom, the front retainer is fixedly arranged at the front end of the empty sleeve shaft, the rear retainer is sleeved at the rear end of the empty sleeve shaft and can axially move along the empty sleeve shaft, a first reset spring is arranged between the rear retainer and the central shaft, the first reset spring acts between the central shaft and the rear retainer to provide restoring force for the rear retainer, the rear retainer can axially move along the central shaft in a driving manner, and the rear retainer is driven by the outside to axially move along the central shaft to meet the gear shifting requirement. The central shaft adopted by the scheme is made of light alloy materials such as aluminum alloy, titanium alloy and the like; the hollow sleeve shaft adopted by the scheme can be made of alloy, carbon fiber, plastic or other composite materials; the retainer of the scheme can be made of alloy, carbon fiber, plastic or other composite materials.
Further, the control component is disposed on one side of the rear surface fluted disc having the concentric toothed ring, and includes a driving cam, a driven cam and a second return spring, the driving cam and the driven cam are both cylindrical cams, the driving cam and the driven cam are coaxially disposed and can relatively move and have circumferential engagement surfaces, the driving cam is located between the rear surface fluted disc and the driven cam, the driving cam can be controlled to rotate circumferentially with a single degree of freedom, the driven cam can move axially with a single degree of freedom, the second return spring is pressed on an outer end surface of the driven cam to keep the driven cam engaged with the driving cam, the driving cam can be controlled to drive and rotate to change the engagement state of the engagement surfaces between the driving cam and the driven cam, and convert the circumferential movement of the driving cam into the axial movement of the driven cam, in this embodiment, the driving cam is connected with an external control end, the driving cam is controlled to drive the driven cam in time so as to untie the meshing state of the rear spherical teeth and the rear fluted disc, and the embedded curved surface of the driving cam and the driven cam is a continuous function curved surface and is symmetrical or a continuous periodic function curved surface, so that the driven cam is stable and free from shaking when moving along the rear wheel shaft, and smooth gear shifting of a transmission system is ensured; in order to reduce the number of parts and reduce production cost, the driving cam is arranged on the rear wheel shaft in an axial limiting mode and can only be driven to rotate circumferentially around the rear wheel shaft, the driven cam is arranged on the rear wheel shaft in a circumferential limiting mode (sliding key connection and the like), and when the driving cam is driven to rotate, a contact point of the driving cam and the driven cam is changed to drive the driven cam to move axially along the rear wheel shaft so as to drive the rear spherical teeth to be disengaged or engaged with the gear ring on the rear fluted disc. The advantage that the cylindrical cam in this scheme set up traditional cam relatively not only initiative cam low angle rotation drives the great displacement of driven cam, and the space occupation ratio is more reasonable than traditional cam. In addition, the cam locking device is arranged in the embodiment, the cam locking limit is released under the traction of the driving cam rotating pull wire, and the driving cam driven cam continues to be locked when the speed change is finished and the driving cam driven cam returns to the initial state, so that the driving shaft is ensured to rotate on the same axis in the non-speed change process. The cam that this scheme adopted can be other hard wear-resisting materials such as alloy. Another embodiment may be that the driving cam and the driven cam are mounted on a frame, the driving cam and the driven cam are both limited by the frame, and the frame further limits the moving angle of the driving cam and the axial displacement of the driven cam.
Furthermore, the central shaft penetrates through the hollow sleeve shaft, the front end of the central shaft is hinged with the frame, the rear end of the central shaft is hinged with the driven cam, the front and rear hinged shafts of the central shaft are parallel to each other and perpendicular to the central shaft, and the driven cam can be disengaged from the rear spherical teeth and the rear toothed disc when being away from the rear toothed disc (wherein the X direction is a bicycle traveling direction, the Y direction is a horizontal direction perpendicular to the X direction, and the Z direction is a vertical direction perpendicular to both the X direction and the Y direction), when the driven cam is located at the farthest position of the rear wheel shaft, the driving shaft is driven to form a certain angle with the X-Z plane of the bicycle body, the meshing state of the rear spherical teeth and the rear fluted disc is simultaneously released, so that the rear spherical teeth are in a free state, and the rear spherical teeth are adjusted to another gear through the adjusting assembly (generally, the manual control end of the adjusting assembly is arranged on a bicycle handle or a steering rod and is freely controlled and switched by a driver).
Further, the adjusting component comprises a follow-up ring fixedly connected with the rear retainer, a translational ring which is arranged on the hollow sleeve shaft and can move along the axial direction with single degree of freedom, a yielding spring which is arranged between the follow-up ring and the translational ring, a limiting pin which is arranged on the rear retainer, a limiting groove which is arranged on the hollow sleeve shaft (the limiting groove can also be arranged on a pipe sleeve part which is sleeved on the central shaft) and a yielding groove which is arranged in the limiting groove, wherein smooth transition is realized between the yielding groove and the limiting groove to ensure that the process of the limiting pin entering the yielding groove from the limiting groove is relatively smooth, the yielding spring is arranged between the follow-up ring and the translational ring to provide a yielding space for circumferential yielding of the follow-up ring relative to the translational ring, the limiting pin is fixedly arranged on the rear retainer and is arranged in the limiting groove to limit the rear retainer to move relative to the hollow sleeve shaft with single degree of freedom in the axial direction, the setting position of the abdicating groove corresponds to each stage of gear rings of the rear gear disc engaged by the rear steel balls one to one, so that the limiting pin can enter the abdicating groove when the retainer rotates in the circumferential direction, when the gear is shifted by the adjusting component, the driving piece of the gear shifting operation (the driving piece can be a stay wire or a pull rod, the control end of the driving piece can extend to be arranged on the handle or the steering rod, and the driving piece of the adjusting component is matched with the driving piece to switch gears) is freely controlled by a rider, the gear shifting operation is realized by the adjusting component through controlling the driving piece, the abdicating groove is matched with the limiting pin to be a rear spherical tooth and the rear gear rings of the rear gear disc provide the adaptive rear retainer circumferential abdicating when the gear rings of the rear gear disc enter the engaging state, the limiting pin can move in the limiting groove in a controlled manner, the rear spherical tooth is engaged with the other gear ring after being disengaged from the rear gear ring, and when the rear spherical The tooth meshing provides yielding space; if the rear spherical tooth just contacts with the tooth tip of the rear fluted disc and does not completely fall into the tooth socket when being meshed, the reaction spring is needed to give way to assist the rear spherical tooth to completely fall into the tooth socket, so that good meshing of the rear spherical tooth and the tooth socket of the rear fluted disc is ensured, and smooth and good power transmission during gear shifting is ensured. In addition, the counter-force spring provides elastic force for preventing the limiting pin from entering the abdicating groove, the elastic force enables the rear spherical tooth to provide an elastic space from zero stress to a stress state, the shock absorption effect is achieved, and a speed fixing effect is provided for the limiting pin to enter the abdicating groove in the transmission stress process.
Further, the follow-up ring and the rear retainer are fixedly connected through bolts, the bolts are convenient and fast to connect, the assembly is convenient, the cost is low, the translation ring is slidably connected with the hollow sleeve shaft through a flat key in a single degree of freedom and can also be in smooth connection in other forms, the cost of the inter-flower connection mode is lowest in industrial design, the assembly is simplest, and the translation ring is located between the rear retainer and the follow-up ring.
Furthermore, a convex block is formed on the translation ring, a spring support is formed on the convex block along the circumferential direction of the driving shaft, the abdicating spring is sleeved on the spring support, a groove corresponding to the spring support is formed on the follow-up ring, and the tail end of the spring support is inserted into the groove so that the abdicating spring acts between the follow-up ring and the translation ring.
Further, the number of the front spherical teeth is less than that of the rear spherical teeth, and a larger speed ratio can be obtained by the arrangement.
Furthermore, the gear ring of the front fluted disc is a circle, so that the front fluted disc and the front spherical teeth are simplified, the front gear shifting parts are reduced, the cost is reduced, and the quality of the whole vehicle is reduced.
Furthermore, the fluted disc has three rings of concentric ring gears at the back, be provided with three groove of stepping down in the spout, three keep off the variable speed promptly, three keep off the variable speed commonly used and can satisfy the demand of riding of bicycle, the size of fluted disc also comparatively reasonable setting at the back simultaneously, whole transmission system low cost, it is rational in infrastructure.
Furthermore, the tooth spaces of the front fluted disc and the rear fluted disc are all ellipsoidal grooves, the tooth root is deepened and the height of the tooth tip is increased on the basis of the spherical grooves, so that the gear transmission superposition coefficient is better, and meanwhile, the deeper tooth groove depth of the ellipsoidal surface avoids the effect that the front spherical teeth move towards the front fluted disc in the speed change process and further generate extrusion on the front fluted disc.
Further, in order to reduce the friction force of the rotation of each part, bearings or similar bearing parts are arranged between the hollow sleeve shaft and the central shaft, between the hub and the rear wheel shaft and between the central shaft and the frame to reduce the friction force.
The invention has the beneficial effects that: according to the chainless bicycle transmission system disclosed by the invention, through optimizing the front fluted disc, the driving shaft and the rear fluted disc, a series of technical problems of difficult gear shifting and speed changing, difficult design, difficult production, difficult maintenance and repair and the like of the traditional chainless bicycle are solved, the friction force in the transmission system is reduced, the transmission efficiency is improved, the structure of the transmission system is simplified, the production cost is reduced, and the universality is improved.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is a schematic structural diagram of a bicycle equipped with a transmission system of the present invention;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is a top view of FIG. 2;
FIG. 4 is an isometric view of a drive shaft;
FIG. 5 is an exploded view of the rear holder and adjustment assembly;
FIG. 6 is a cross-sectional view of the adjustment assembly;
fig. 7 is a cross-sectional view of the front cage.
Detailed Description
FIG. 1 is a schematic structural diagram of a bicycle equipped with a transmission system of the present invention, FIG. 2 is a schematic structural diagram of the present invention, FIG. 3 is a top view of FIG. 2, FIG. 4 is an isometric view of a drive shaft, FIG. 5 is an exploded schematic view of a rear retainer and an adjustment assembly, FIG. 6 is a cross-sectional view of the adjustment assembly, and FIG. 7 is a cross-sectional view of a front retainer, wherein the chainless bicycle transmission system of the present embodiment includes a drive shaft 1, a front chainring 2 and a rear chainring 3, the front chainring 2 including a chainring and at least one concentric chainring disposed on an end face of the chainring; the rear fluted disc 3 comprises an embedded fluted disc and at least one concentric ring gear arranged on the end face of the embedded fluted disc; the front end of the driving shaft 1 is provided with a front spherical tooth 11 which is meshed with a concentric ring gear arranged on a front fluted disc 2 in an alternative mode, the rear end of the driving shaft 1 is provided with a rear spherical tooth 12 which is meshed with a concentric ring gear arranged on a rear fluted disc 3 in an alternative mode, the driving shaft further comprises a control assembly for controlling and changing the meshing state of the rear spherical tooth 12 and the rear fluted disc 3 and an adjusting assembly for adjusting the relative position of the rear spherical tooth 12 on the driving shaft 1, the number of the front spherical teeth 11 and the number of the rear spherical teeth 12 can be set according to actual parameter proportion, the number of the front spherical teeth 11 in the scheme of the application is slightly lower than the number of the rear spherical teeth 12 (generally, the circumferential radius of the cross section of the front spherical teeth 11a of the front retainer 11a is slightly smaller than the circumferential radius of the cross section of the rear spherical teeth 12a, increase riding comfort); the ball bearing has the advantages that the friction force can be reduced to the maximum extent through universal rotation (similar to a universal ball structure), compared with the gear structure adopted by the Cdiven, the ball bearing (universal ball) similar structure has the advantages that the ball bearing (universal ball) can roll along the direction of the maximum friction of the transmission of the secondary teeth completely in the transmission process and the stress is uniform, and the gear structure adopted by the Cdiven, namely the gear teeth, the bearing or the roller (cylinder) can only rotate along the axial direction of the gear structure, so that the unfavorable friction of the gear structure is not reduced to the maximum extent, and the service life of the gear structure can be reduced due to the friction. The ball that adopts in this scheme can be other smooth hard wear-resisting materials such as pottery, for example pottery, alloy, hard rostone etc. can increase substantially power conversion efficiency when using, and the operation is reliable, has reduced manufacturing cost.
In this embodiment, the front spherical teeth 11 are balls and are arranged at the front end of the driving shaft 1 through a front retainer 11a, the number of the front spherical teeth 11 is not less than one, the rear spherical teeth 12 are balls and are arranged at the rear end of the driving shaft 1 through a rear retainer 12a, the relative position of the rear retainer 12a and the driving shaft 1 can be adjusted through an adjusting assembly, and the number of the rear spherical teeth 12 is not less than one.
In this embodiment, the driving shaft 1 includes a central shaft 1a and an empty sleeve shaft 1b concentrically arranged, the hollow sleeve shaft 1b can rotate around the central shaft 1a in a single degree of freedom, the front retainer 11a is fixedly arranged at the front end of the hollow sleeve shaft 1b, the rear retainer 12a is sleeved at the rear end of the hollow sleeve shaft 1b and can move along the axial direction of the hollow sleeve shaft 1b, a first return spring is arranged between the rear retainer 12a and the central shaft 1a, the first return spring is used for providing return force for the rear retainer 12a, the first return spring acts between the central shaft 1a and the rear retainer 12a to provide return force for the axial movement of the rear retainer 12a, the rear retainer 12a can be driven to axially move along the central shaft 1a, and the rear retainer 12a is driven by the outside to axially move along the central shaft 1a to meet the gear shifting requirement. The central shaft 1a adopted by the scheme is made of light alloy materials, and is more than aluminum alloy, titanium alloy and the like; the hollow sleeve shaft 1b adopted by the scheme can be made of alloy, carbon fiber, plastic or other composite materials; the retainer of the scheme can be made of alloy, carbon fiber, plastic or other composite materials.
In this embodiment, the control component is disposed on one side of the rear surface toothed disc having the concentric toothed ring, and includes a driving cam 4a, a driven cam 4b, and a second return spring 4c, where the driving cam 4a and the driven cam 4b are both cylindrical cams, the driving cam 4a and the driven cam 4b are coaxially disposed and can move relatively, and have circumferential engagement surfaces, the driving cam 4a is located between the rear surface toothed disc and the driven cam 4b, the driving cam 4a can be controlled to rotate circumferentially with a single degree of freedom, the driven cam 4b can move axially with a single degree of freedom, the second return spring 4c is pressed on an outer end surface of the driven cam 4b to keep the driven cam 4b engaged with the driving cam 4a, and the driving cam 4a can be controlled to rotate to make the driving cam 4a and the driven cam 4b change the engagement state of the engagement surfaces, the circumferential motion of the driving cam 4a is converted into the axial movement of the driven cam 4b, in the embodiment, the driving cam 4a is connected with an external control end, the driving cam 4a is controlled to drive the driven cam 4b timely so as to untie the meshing state of the rear spherical teeth 12 and the rear fluted disc 3, and the embedded curved surfaces of the driving cam 4a and the driven cam 4b are continuous function curved surfaces and are symmetrical or continuous periodic function curved surfaces, so that the driven cam 4b is ensured to be stable and free from shaking when moving along a rear wheel shaft, and the smooth gear shifting of a transmission system is ensured; in order to reduce the number of parts and reduce the production cost, the driving cam 4a is arranged on the rear wheel shaft in an axial limiting mode and can only be driven to rotate circumferentially around the rear wheel shaft, the driven cam 4b is arranged on the rear wheel shaft in a circumferential limiting mode (sliding key connection and the like), and when the driving cam 4a is driven to rotate, a contact point with the driven cam 4b changes to drive the driven cam 4b to move axially along the rear wheel shaft so as to drive the rear spherical teeth 12 to be disengaged or engaged with the gear ring on the rear fluted disc 3. The advantage of the double-cylinder cam setting in this scheme relative to the traditional cam is that not only does the driving cam 4a rotate at a low angle to drive the driven cam 4b to displace greatly, but also the space occupancy is more reasonable than the traditional cam. In addition, the cam locking device is arranged in the embodiment, the cam locking device releases the locking limit of the cam under the traction of the driving cam 4a to rotate the pull wire, and the cam 4a and the driven cam 4b continue to be locked when the speed change is finished and the driven cam 4b returns to the initial state, so that the driving shaft 1 is ensured to rotate on the same axis in the non-speed change process. The cam that this scheme adopted can be other hard wear-resisting materials such as alloy. Another embodiment may be that the driving cam 4a and the driven cam 4b are mounted on a frame, the driving cam 4a and the driven cam 4b are both limited by the frame, and the function of the frame further includes limiting the moving angle of the driving cam 4a and the axial displacement of the driven cam 4 b.
In this embodiment, the central shaft 1a penetrates through the hollow sleeve shaft 1b, the front end of the central shaft 1a is hinged to the frame, the rear end of the central shaft is hinged to the driven cam 4b, the front and rear hinged shafts of the central shaft 1a are parallel to each other and perpendicular to the central shaft 1a, the driven cam 4b can be disengaged from the rear fluted disc 3 when being away from the rear fluted disc 3, the meshing state between the rear spherical teeth 12 and the rear fluted disc 3 can be disengaged, (wherein the X direction is the bicycle driving direction, the Y direction is the horizontal direction perpendicular to the X direction, and the Z direction is the vertical direction perpendicular to both the X direction and the Y direction), when the driven cam 4b is located at the farthest position from the rear fluted disc from the rear wheel shaft, the driving shaft 1 is driven to form a certain angle with the X-Z plane of the bicycle body, and the meshing state between the rear spherical teeth 12 and the rear fluted disc 3 can be disengaged while leaving the rear spherical teeth 12 in a free state, and freely operating the shift gears).
In this embodiment, the adjusting assembly includes a follower ring 5a fixedly connected to the rear holder 12a, a translational ring 5b disposed on the hollow sleeve shaft 1b and capable of moving with a single degree of freedom in the axial direction, a circumferential yielding spring 5c disposed between the follower ring 5a and the translational ring 5b, a limit pin 5d disposed on the rear holder 12a, a limit groove 5e disposed on the hollow sleeve shaft 1b (the limit groove 5e may also be disposed on a sleeve component sleeved on the central shaft 1 a), and a yielding groove 5f disposed in the limit groove 5e, wherein smooth transition between the yielding groove 5f and the limit groove 5e ensures that the process of the limit pin 5d entering the yielding groove 5f from the limit groove 5e is relatively smooth, the yielding spring 5c disposed between the follower ring 5a and the translational ring 5b provides an elastic force for circumferential yielding of the follower ring 5a relative to the translational ring 5b, the limit pin 5d is fixedly arranged on the rear holder 12a and is arranged in the limit groove 5e, the rear holder 12a is limited in the limit groove 5e and only moves in a single degree of freedom in the axial direction relative to the hollow sleeve shaft 1b, the set position of the abdicating groove 5f is in one-to-one correspondence with each stage of gear rings of the rear spherical tooth disc 3 in the meshing mode, the limit pin 5d can enter the abdicating groove 5f when the holder rotates in the circumferential direction, when the gear is shifted by the adjusting component, a driving piece (the driving piece can be a pull wire or a pull rod, an operation end of the driving piece can be extended and arranged on a handle or a steering rod, and the driving piece of the adjusting component is matched with the gear to switch gears) is freely controlled by a rider, the gear shifting operation is realized by the adjusting component through controlling the driving piece, the abdicating groove 5f and the limit pin 5d are matched to provide the rear spherical tooth 12 and the rear holder 12a circumferential direction of the rear spherical The limiting pin 5d can move in the limiting groove 5e in a controlled manner, the rear spherical tooth 12 needs to be meshed with a certain stage of gear ring of the rear fluted disc 3 after being separated from the other stage of gear ring, and when the rear spherical tooth 12 just enters meshing, if the rear spherical tooth 12 is just clamped into the gear ring, the counter force spring does not need to provide a yielding space for meshing of the rear spherical tooth 12; if the rear spherical tooth 12 just contacts with the tooth tip of the rear fluted disc 3 and does not completely fall into the tooth socket when being meshed, the reaction spring is needed to give way to assist the rear spherical tooth 12 to completely fall into the tooth socket, so that the rear spherical tooth 12 is well meshed with the tooth socket of the rear fluted disc 3, and smooth and good power transmission during gear shifting is guaranteed. In addition, the abdicating spring 5c provides elastic force for preventing the limit pin 5d from entering the abdicating groove 5f, the elastic force enables the rear spherical tooth 12 to provide an elastic space from zero stress to a stress state, the shock absorption effect is achieved, and a speed fixing effect is provided for the limit pin 5d to enter the abdicating groove 5f in the transmission stress process.
In this embodiment, the following ring 5a and the rear holder 12a are fixedly connected by bolts, the bolts are conveniently and quickly connected, the assembly is convenient, and the cost is low, the translational ring 5b is slidably connected with the hollow sleeve shaft 1b by a single degree of freedom through a flat key, or can be smoothly connected in other forms, the cost of the inter-flower connection mode is lowest in industrial design, the assembly is simplest, and the translational ring 5b is located between the rear holder 12a and the following ring 5 a.
In this embodiment, a bump 51b is formed on the translational ring 5b, a spring support 52b is formed on the bump 51b along the circumferential direction of the driving shaft 1, the abdicating spring 5c is sleeved on the spring support 52b, a groove 51a corresponding to the spring support 52b is formed on the follower ring 5a, and the tail end of the spring support 52b is inserted into the groove 51a so that the abdicating spring 5c acts between the follower ring 5a and the translational ring 5 b.
In the present embodiment, the number of the front spherical teeth 11 is smaller than the number of the rear spherical teeth 12, and this arrangement can obtain a larger speed ratio.
In this embodiment, the ring gear of preceding fluted disc 2 is the round, simplifies preceding fluted disc 2 and preceding spherical tooth 11, reduces anterior spare part of shifting, reduce cost, reduces whole car quality.
In this embodiment, the back fluted disc 3 has three rings of concentric ring gears, be provided with three groove 5f of stepping down in the spout, three keep off the variable speed promptly, three keep off the variable speed commonly used can satisfy the demand of riding of bicycle, and the size of fluted disc 3 also comparatively reasonable setting behind simultaneously, whole transmission system low cost, it is rational in infrastructure.
In this embodiment, the tooth spaces of the front fluted disc 2 and the rear fluted disc 3 are both ellipsoidal grooves, which deepens the tooth root and increases the height of the tooth tip on the basis of the spherical grooves, so as to have a better transmission coincidence coefficient, and the deeper depth of the ellipsoidal grooves prevents the front spherical teeth from moving towards the front fluted disc 2 in the speed change process, thereby generating the extrusion effect on the front fluted disc 2.
In the embodiment, in order to reduce friction force of rotation of each component, bearings or similar bearing components are arranged between the hollow sleeve shaft 1b and the central shaft 1a, between the hub and the rear wheel shaft, and between the central shaft and the frame to reduce friction force.
According to the chainless bicycle transmission system disclosed by the invention, through optimizing the front fluted disc 2, the driving shaft 1 and the rear fluted disc 3, a series of technical problems of difficult gear shifting and speed changing, difficult design, difficult production, difficult maintenance and repair and the like of the traditional chainless bicycle are solved, the friction force in the transmission system is reduced, the transmission efficiency is improved, the structure of the transmission system is simplified, the production cost is reduced, and the universality is improved.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (10)
1. A chainless bicycle transmission system, comprising: the front fluted disc comprises an embedded fluted disc and at least one concentric toothed ring arranged on the end face of the embedded fluted disc; the rear fluted disc comprises an embedded fluted disc and at least one concentric toothed ring arranged on the end face of the embedded fluted disc; the front end of the driving shaft is provided with a front spherical tooth which is selectively meshed with a concentric ring gear arranged on a front fluted disc, the rear end of the driving shaft is provided with a rear spherical tooth which is selectively meshed with a concentric ring gear arranged on a rear fluted disc, and the front spherical tooth and rear fluted disc drive mechanism further comprises a control assembly for controlling and changing the meshing state of the rear spherical tooth and the rear fluted disc and an adjusting assembly for adjusting the relative position of the rear spherical tooth on the driving shaft.
2. The chainless bicycle transmission system of claim 1, wherein: the front spherical teeth are balls and are arranged at the front end of the driving shaft through a front retainer, the number of the front spherical teeth is not less than one, the rear spherical teeth are balls and are arranged at the rear end of the driving shaft through a rear retainer, the relative position of the rear retainer and the driving shaft can be adjusted through an adjusting assembly, and the number of the rear spherical teeth is not less than one.
3. The chainless bicycle transmission system of claim 2, wherein: the driving shaft comprises a central shaft and an empty sleeve shaft which are arranged concentrically, the empty sleeve shaft can rotate around the central shaft in a single degree of freedom, the front retainer is fixedly arranged at the front end of the empty sleeve shaft, the rear retainer is sleeved at the rear end of the empty sleeve shaft and can axially move along the empty sleeve shaft, and a first reset spring is arranged between the rear retainer and the central shaft and used for providing reset restoring force for the rear retainer.
4. The chainless bicycle transmission system of claim 1, wherein: the control component is arranged on one side, provided with a concentric toothed ring, of the rear surface fluted disc and comprises a driving cam, a driven cam and a second return spring, the driving cam and the driven cam are cylindrical cams, the driving cam and the driven cam can move relatively and are coaxially arranged and are provided with circumferential embedding surfaces, the driving cam is positioned between the rear surface fluted disc and the driven cam, the driving cam can be controlled to rotate circumferentially with a single degree of freedom, the driven cam can move axially with the single degree of freedom, the second return spring is pressed on the outer end surface of the driven cam to keep the embedded state of the driven cam and the driving cam, the driving cam can be controlled to drive and rotate to enable the driving cam and the driven cam to change the embedded state of the embedding surfaces, and the circumferential motion of the driving cam is converted into the axial motion of the driven cam.
5. The chainless bicycle transmission system of claim 4, wherein: the central shaft penetrates through the hollow sleeve shaft, the front end of the central shaft is hinged with the frame, the rear end of the central shaft is hinged with the driven cam, the front and rear hinged shafts of the central shaft are parallel to each other and are perpendicular to the central shaft, and the driven cam can be used for unlocking the meshing state of the rear spherical teeth and the rear fluted disc when being far away from the rear fluted disc.
6. The chainless bicycle transmission system of claim 3, wherein: the adjusting component comprises a follow-up ring fixedly connected with the rear retainer, a translational ring which is arranged on the hollow sleeve shaft and can move along the axial direction with single degree of freedom, a circumferential abdicating spring arranged between the follow-up ring and the translational ring, a limiting pin arranged on the rear retainer, a limiting groove arranged on the hollow sleeve shaft and an abdicating groove arranged in the limiting groove, the abdicating spring is arranged between the follow-up ring and the translation ring to provide abdicating space for circumferential abdicating of the follow-up ring relative to the translation ring, the limiting pin is fixedly arranged on the rear retainer and is arranged in the limiting groove to limit the rear retainer to move relative to the hollow sleeve shaft in a single degree of freedom in the axial direction, the arrangement positions of the abdicating grooves correspond to all levels of gear rings of the rear fluted disc meshed by the rear balls one by one, and the limiting pins can enter the abdicating grooves when the retainer rotates in the circumferential direction.
7. The chainless bicycle transmission system of claim 6, wherein: the follow-up ring is fixedly connected with the rear retainer through a bolt, the translation ring is slidably connected with the hollow sleeve shaft through a flat key in a single degree of freedom, and the translation ring is positioned between the rear retainer and the follow-up ring.
8. The chainless bicycle transmission system of claim 7, wherein: the translation ring is provided with a convex block, a spring support is formed on the convex block along the circumferential direction of the driving shaft, the abdicating spring is sleeved on the spring support, a groove corresponding to the spring support is formed on the follow-up ring, and the tail end of the spring support is inserted into the groove so that the abdicating spring acts between the follow-up ring and the translation ring.
9. The chainless bicycle transmission system of claim 1, wherein: the number of the front spherical teeth is less than the number of the rear spherical teeth.
10. The chainless bicycle transmission system of claim 1, wherein: the gear ring of the front fluted disc is a circle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110020626.9A CN112678111A (en) | 2021-01-07 | 2021-01-07 | Chainless bicycle transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110020626.9A CN112678111A (en) | 2021-01-07 | 2021-01-07 | Chainless bicycle transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112678111A true CN112678111A (en) | 2021-04-20 |
Family
ID=75456394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110020626.9A Pending CN112678111A (en) | 2021-01-07 | 2021-01-07 | Chainless bicycle transmission system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112678111A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114148444A (en) * | 2021-10-29 | 2022-03-08 | 上海第二工业大学 | Three-gear speed-changing chainless transmission shaft of bicycle |
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| TW201219261A (en) * | 2010-11-05 | 2012-05-16 | Ji-Hyun Ma | Gear transmission apparatus for chainless bicycle |
| CN109941392A (en) * | 2019-02-21 | 2019-06-28 | 上海工程技术大学 | A kind of no chain-type bicycle with stepless speed change |
| CN110304191A (en) * | 2018-03-27 | 2019-10-08 | 赛拉米克斯皮德运动股份有限公司 | Bicycle drive train system |
| CN110758630A (en) * | 2019-11-08 | 2020-02-07 | 湖北机烧妙烤科技有限公司 | Novel chainless double-speed-changing bicycle |
| CN111377035A (en) * | 2020-03-27 | 2020-07-07 | 常州工学院 | Speed regulating system of bicycle |
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|---|---|---|---|---|
| CN2244521Y (en) * | 1995-09-18 | 1997-01-08 | 黄云峰 | Speed transforming transmission for motorcycle |
| US20040083839A1 (en) * | 2002-11-04 | 2004-05-06 | Hahn Terry Luke | Simple bicycle drive shaft transmission |
| TW201219261A (en) * | 2010-11-05 | 2012-05-16 | Ji-Hyun Ma | Gear transmission apparatus for chainless bicycle |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114148444A (en) * | 2021-10-29 | 2022-03-08 | 上海第二工业大学 | Three-gear speed-changing chainless transmission shaft of bicycle |
| CN114148444B (en) * | 2021-10-29 | 2023-03-24 | 上海第二工业大学 | Three-gear speed-changing chainless transmission shaft of bicycle |
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Application publication date: 20210420 |