CN220147515U

CN220147515U - Bicycle gearbox transmission device with load speed change and gearbox

Info

Publication number: CN220147515U
Application number: CN202321029185.XU
Authority: CN
Inventors: 蔡明�
Original assignee: Individual
Current assignee: Individual
Priority date: 2023-04-29
Filing date: 2023-04-29
Publication date: 2023-12-08
Anticipated expiration: 2033-04-29

Abstract

The utility model relates to a bicycle gearbox transmission device with load speed change and a gearbox, wherein the gearbox transmission device comprises a main shaft, a counter shaft and an output sprocket, a main shaft gear and a driving ratchet wheel are arranged on the main shaft, a counter shaft gear and a driven ratchet wheel are arranged on the counter shaft, a shifting groove is arranged between the driving ratchet wheel and the driven ratchet wheel, and the main shaft gear and the counter shaft gear are mutually matched and meshed; at least one of the driving ratchet wheel and the driven ratchet wheel is a double-ratchet wheel, two main shaft gears or two auxiliary shaft gears with single ratchet teeth are arranged on two sides of the double-ratchet wheel, the double-ratchet wheel moves left and right on the main shaft or the auxiliary shaft and is meshed with/separated from the two main shaft gears or the two auxiliary shaft gears of the single ratchet teeth respectively through the ratchet teeth on two sides; one of the main shaft gears is a direct drive gear, and the output chain wheel is fixed on the direct drive gear; the ratchet teeth are all helical teeth. The compact bicycle transmission adopting the technical scheme has compact structure, can directly enter a traveling gear and withdraw the gear, and has stable operation.

Description

Bicycle gearbox transmission device with load speed change and gearbox

Technical Field

The utility model relates to a bicycle transmission in a vehicle, in particular to a bicycle transmission device with load speed change and a transmission case.

Background

Bicycles, also known as bicycles or scooters. At present, the transmission speed ratio of a bicycle is fixed and unchanged and the speed ratio is adjustable, most of the mechanisms with adjustable bicycle speed ratio adopt flywheel fluted discs with different teeth numbers, the flywheel fluted discs with different teeth numbers are fixedly arranged on the flywheel, and are combined with the flywheel fluted discs with different teeth numbers through chain adjusting sprockets, so that different transmission speed ratios are realized, the existing speed-changing bicycle speed changer generally adopts a structure with a plurality of chain discs, and is connected with different chain discs in a matched manner through adjusting the positions of the chain, the mode is relatively troublesome in gear shifting, and the gear shifting is required to be carried out when the bicycle runs, so that the situation of gear shifting failure often occurs, and the abrasion on the chain is relatively large; there are also individual speed-changing bicycle transmissions using a gear box, for example, chinese patent CN205168799U discloses a central axle type bicycle internal transmission which is formed by arranging a first groove between two second transmission gears of each planetary gear set, and arranging a first protrusion capable of being inserted into the first groove on an inner circumferential surface of a gear ring, so that six gear rings can be fixed on a planetary gear fixing frame. Most of the prior transmissions are driven by common gears, and some of the prior transmissions are driven by planetary gears, and the prior transmissions generally have a plurality of meshes. Because the structure of the speed changer is complex, the parts are more, and the parts need to be precisely matched, so that the size of the speed changer is difficult to reduce. Meanwhile, when the transmission shifts gears, the transmission needs to enter a neutral gear first and then shifts gears, and the operation is complex. In addition, the gear has certain potential safety hazards in the neutral gear, and partial safety accidents occur due to entering the neutral gear.

Engagement is an important component of a transmission, and the existing engagement structure is complex: a ring is arranged beside the transmission gear of each gear, a conical surface for friction is arranged on the gear, a meshing sleeve is arranged between the two rings, and structures such as sliding blocks, spring rings and the like are required to be arranged between the meshing sleeve and the rings. During gear shifting, a neutral gear is firstly entered, and then a gear is entered; when the gear is shifted, the ring and the transmission gear can be meshed with the ring and the transmission gear only after the friction force acts on the ring and the transmission gear, and then gear shifting is completed. CN203098620U announces an automobile gearbox, comprising a gear hub, a ring, a meshing sleeve and a sliding block for enabling the meshing sleeve to push the ring to slide during gear shifting, wherein the ring is provided with a groove matched with the sliding block, the sliding block is positioned in the groove during neutral gear, an elastomer is attached to the side surface of the sliding block, and the end surface of the elastomer is contacted with the groove surface of the groove. According to the automobile gearbox provided by the utility model, the sliding block is in non-rigid contact with the ring during gear shifting, so that gear shifting noise can be reduced, and continuous friction between the ring and the gear can be avoided during gear shifting.

The prior compact bicycle speed changer has the defects of not compact gear shifting structure and incapability of better direct gear shifting and gear reversing. In order to solve the technical problems, the technical scheme of the small-size middle-mounted speed changer is adopted on a speed-changing bicycle to solve the defects of a flywheel fluted disc structure, the adopted technical scheme is that the compact speed changer is arranged in the middle part of the bicycle (the lower cross part of a bicycle frame), the original bicycle pedal shaft is used as a power input shaft of the speed changer, the output shaft of the speed changer drives the output chain wheel to drive the rear wheel flywheel of the bicycle, other structures of the bicycle are not changed, but because the space of the position of the bicycle is limited, the space of the middle-mounted speed changer is limited, at most five speed changes can be arranged, more gears can not be increased, and the structure of the speed changer needs to be more compact in order to adapt to multi-stage speed regulation.

Disclosure of Invention

The first object of the present utility model is to provide a bicycle transmission device with load shifting, which is more compact in structure and stable in operation, and overcomes the defect of the existing compact bicycle transmission that the gear shifting structure is not compact.

In order to achieve the above-mentioned aim, the utility model relates to a bicycle gearbox transmission device with load speed change, which comprises a main shaft, a countershaft and an output sprocket, wherein a plurality of main shaft gears and a driving ratchet wheel are arranged on the main shaft, a plurality of countershaft gears and driven ratchet wheels are arranged on the countershaft, a shifting groove is arranged between the driving ratchet wheel and the driven ratchet wheel, and the main shaft gears and the countershaft gears are mutually matched and meshed; at least one of the driving ratchet wheel and the driven ratchet wheel is a double-ratchet wheel, two main shaft gears or two auxiliary shaft gears with single ratchet teeth are arranged on two sides of the double-ratchet wheel, and the double-ratchet wheel moves left and right on the main shaft or the auxiliary shaft and is respectively meshed with/separated from the two main shaft gears or the two auxiliary shaft gears of the single ratchet teeth through ratchet teeth on two sides; one of the main shaft gears is a direct drive gear, and the output chain wheel is fixed on the direct drive gear; the ratchets are helical teeth.

According to the technical scheme, one of the main shaft gears is the direct-drive gear, the output chain wheel is fixed on the direct-drive gear, compared with the existing compact transmission, gear pairs are reduced, so that the gear shifting structure is more compact, meanwhile, at least one gear main shaft gear is arranged on the main shaft, at least one gear auxiliary shaft gear is arranged on the auxiliary shaft, at least one gear main shaft gear or one gear auxiliary shaft gear is sleeved on the one-way clutch, the one-way clutch is fixedly sleeved on the corresponding main shaft or auxiliary shaft, and therefore, the thickness of the one gear main shaft gear or the one gear auxiliary shaft gear or the gap between the one gear main shaft gear or the gear auxiliary shaft gear and the gears arranged on the side edge can be reduced at least due to the fact that the one-way clutch is combined and arranged inside the one gear main shaft gear or the one gear auxiliary shaft gear, the structure is more compact, the volume of the whole bicycle gearbox can be reduced under the condition that the same transmission strength of the gears is guaranteed, and the one-way clutch is more suitable for arranging other gears on bicycles or more spaces. The double-ratchet wheel can be arranged on the main shaft or the auxiliary shaft, and the corresponding gear of the double-ratchet wheel idles. One of the gears is a direct drive gear. The ratchet teeth of the gear can be concave or convex, the ratchet teeth are limited to be helical teeth, under the thrust of the tooth roots of the helical teeth, the direction of force is towards the root of the ratchet teeth when the working face of the ratchet teeth is stressed due to the angle of the ratchet teeth, and the ratchet teeth of the gear and the ratchet teeth of the sleeve are automatically clamped, so that torque is transmitted.

Further, at least one gear main shaft gear is arranged on the main shaft, at least one gear auxiliary shaft gear is arranged on the auxiliary shaft, at least one gear main shaft gear or one gear auxiliary shaft gear is sleeved on the one-way clutch, and the one-way clutch is fixedly sleeved on the corresponding main shaft or auxiliary shaft.

The structure that the first gear main shaft gear or the first gear auxiliary shaft gear is sleeved on the one-way clutch is fixedly sleeved on the corresponding main shaft or auxiliary shaft can ensure that the thickness of a ratchet wheel and a control unit are reduced on the original volume, and the volume can be made smaller.

Further, a specific five-gear gearbox transmission device is limited, a first-gear main shaft gear, a five-gear main shaft gear, a three-gear main shaft gear, a four-gear main shaft gear and a direct drive gear are arranged on the main shaft from left to right, a first double-ratchet wheel is arranged between the five-gear main shaft gear and the three-gear main shaft gear, a second double-ratchet wheel is arranged between the four-gear main shaft gear and the direct drive gear, wherein the first-gear main shaft gear is fixedly connected to the main shaft, the five-gear main shaft gear, the three-gear main shaft gear, the four-gear main shaft gear and the direct drive gear are sleeved on the main shaft in an empty mode, and the first double-ratchet wheel and the second double-ratchet wheel are sleeved on the main shaft in a sliding mode; a first-gear auxiliary shaft gear, a five-gear auxiliary shaft gear, a three-gear auxiliary shaft gear, a four-gear auxiliary shaft gear and a reverse gear are arranged on the auxiliary shaft from left to right, a one-way clutch is arranged between the first-gear auxiliary shaft gear and the five-gear auxiliary shaft gear, the first-gear auxiliary shaft gear is sleeved on the one-way clutch, and the one-way clutch is fixedly sleeved on the auxiliary shaft; the five-gear auxiliary shaft gear, the three-gear auxiliary shaft gear, the four-gear auxiliary shaft gear and the reverse gear are fixedly connected to the auxiliary shaft.

Of course, the structure can also adjust the arrangement positions and the quantity of gears, correspondingly arrange a gear shift lever and a shifting fork, and can also be used as a six-gear gearbox transmission device, a seven-gear gearbox transmission device and the like.

The second object of the present utility model is to provide a gearbox for a bicycle gearbox transmission device using such a load-bearing speed change, which makes the gearbox more compact in structure and stable in operation, and overcomes the defect of the existing bicycle gearbox that the structure is not compact.

The transmission case of the bicycle transmission case transmission device with the load speed change further comprises a gear shifting device, the gear shifting device comprises a gear shifting drum, a gear shifting rod and a gear shifting fork, the gear shifting drum is rotationally fixed on the case, two ends of a main shaft and a secondary shaft are mounted on the case through bearings, the gear shifting rod can be movably fixed on the case in a left-right moving mode, the rotation center line of the gear shifting drum is parallel to the rotation center line of the secondary shaft, a gear shifting drum wheel groove is formed in the circumferential surface of the gear shifting drum, the gear shifting fork comprises a lower-section fork part and an upper-section fork connecting part, the fork part is clamped in the middle of a ratchet wheel, the front end of the gear shifting rod is movably fixed in the gear shifting drum groove, the rear end of the gear shifting rod is movably connected with the fork connecting part, and the connecting part of the gear shifting rod and the fork is an elastic connecting part. Due to the adoption of the structure of the speed changing device, the requirement on the box body of the speed changing box is smaller, the structure is more compact, and meanwhile, the gear shifting is stable compared with the original flywheel fluted disc mechanism.

Further, the elastic connecting piece is limited to be a metal spring piece, the upper end of the metal spring piece is fixedly connected to the gear shifting rod, and the lower end of the metal spring piece movably clamps the gear shifting fork.

The gear shifting deflector rod and the connecting piece of the shifting fork are elastic connecting pieces, so that when a gear is shifted in or out, the ratchet wheels corresponding to the ratchet teeth of the main shaft gear or the auxiliary shaft gear are combined, hard contact between the ratchet teeth is avoided, the phenomenon of tooth hitting and clamping stagnation is avoided, the gear can be directly shifted in or out better, and meanwhile, the mature gear shifting drum technology can also ensure the defect that the existing compact transmission is easy to jump gear automatically under the condition of bad riding road conditions;

the same reason limits that the elastic connecting piece is a torsion spring, the torsion spring comprises a torsion spring body and a torsion spring output end, the torsion spring body is fixedly connected to the gear shifting deflector rod, and the gear shifting deflector is movably clamped by the torsion spring output end.

Further, other specific structures except for the gear shifting drum in the gear shifting device are specifically limited, namely the gear shifting device further comprises a fixing plate and a shifting fork guide rod, wherein the fixing plate is fixed on the box body, the shifting fork guide rod is fixed on the fixing plate or directly fixed on the box body, the shifting fork connecting part is a hollow tube, and the hollow tube is movably sleeved on the shifting fork guide rod.

Still further, the gear box adopting the technical scheme is defined as a five-gear box, a first-gear main shaft gear, a five-gear main shaft gear, a three-gear main shaft gear, a four-gear main shaft gear and a direct drive gear are arranged on the main shaft from left to right, a first double-ratchet wheel is arranged between the five-gear main shaft gear and the three-gear main shaft gear, a second double-ratchet wheel is arranged between the four-gear main shaft gear and the direct drive gear, wherein the first-gear main shaft gear is fixedly connected to the main shaft, the five-gear main shaft gear, the three-gear main shaft gear, the four-gear main shaft gear and the direct drive gear are sleeved on the main shaft in an empty mode, and the first double-ratchet wheel and the second double-ratchet wheel are sleeved on the main shaft in a sliding mode; a first-gear auxiliary shaft gear, a five-gear auxiliary shaft gear, a three-gear auxiliary shaft gear, a four-gear auxiliary shaft gear and a reverse gear are arranged on the auxiliary shaft from left to right, a one-way clutch is arranged between the first-gear auxiliary shaft gear and the five-gear auxiliary shaft gear, the first-gear auxiliary shaft gear is sleeved on the one-way clutch, and the one-way clutch is fixedly sleeved on the auxiliary shaft; the first-gear auxiliary shaft gear is sleeved on the auxiliary shaft in an empty mode, and the five-gear auxiliary shaft gear, the three-gear auxiliary shaft gear, the four-gear auxiliary shaft gear and the reverse gear are fixedly connected to the auxiliary shaft.

In the five-gear transmission structure, the number of the gear shifting levers and the number of the gear shifting forks are two, wherein the first gear shifting lever controls the first double-ratchet wheel, and the second gear shifting lever controls the second double-ratchet wheel.

In the utility model, the technical effect of the matched connection between the gear and the ratchet wheel by adopting the mode is as follows: (1) Because the structure that the inner ratchet gear and the one-way clutch are in a normally contacted state is adopted, the clutch is driven in an engaged state when power transmission is needed, and the clutch is slipped in a separated state when power transmission is not needed. (2) When clamping is needed, the ratchet wheel and the gear ratchet are easy to engage, and can be prevented from falling off; (3) With a speed difference, the ratchet teeth and the gear teeth are easily disengaged. The specific reasons are as follows: due to the angle of the ratchet, when the working face of the ratchet is stressed, the direction of the force faces the root of the ratchet, so that the ratchet and the gear ratchet are automatically clamped, and torque is transmitted. Because the back angle of the ratchet is gentle, the moment cannot be transmitted, and when the back of the ratchet is stressed, the direction of force is away from the tooth root, so that the ratchet and the gear are away from each other, and the ratchet and the gear are automatically separated.

Another object of the present utility model is to provide a shift method for a specific five speed compact bicycle transmission,

when the gearbox is in a starting first gear position, the first double-ratchet wheel and the second double-ratchet wheel are in a separated state with corresponding gears, and the first auxiliary shaft gear and the one-way clutch are in a combined state;

1) When the gear is shifted from the first gear to the second gear, the gear shifting drum is rotated, the second gear shifting deflector rod drives the second double-ratchet to move rightwards, and the ratchet positioned on the right side of the second double-ratchet is meshed with the ratchet positioned on the left side of the direct-drive gear; meanwhile, as the rotation degree of the second gear is larger than that of the first gear, the first gear auxiliary shaft gear and the one-way clutch are in a separation state; the power is directly rotated through an output chain wheel fixed on the direct-drive gear;

2) When the gear is shifted from the second gear to the third gear, the gear shifting drum is rotated, the second gear shifting deflector rod drives the second double-ratchet wheel to move leftwards, and the ratchet wheel on the right side of the second double-ratchet wheel is separated from the ratchet wheel on the left side of the direct-drive gear; simultaneously, the first gear shifting deflector rod drives the first double-ratchet wheel to move rightwards, a ratchet wheel positioned on the right side of the first double-ratchet wheel is meshed with a ratchet wheel positioned on the left side of the three-gear main shaft gear, the three-gear main shaft gear drives the three-gear auxiliary shaft gear to rotate, the three-gear auxiliary shaft gear drives the auxiliary shaft and the reverse gear to rotate, the reverse gear drives the direct-drive gear on the main shaft to rotate, and the output sprocket wheel rotates;

3) When the gear is shifted from the three gear to the four gear, the gear shifting drum is rotated, the first gear shifting deflector rod drives the first double-ratchet wheel to move leftwards, and the ratchet wheel positioned on the right side of the first double-ratchet wheel is separated from the ratchet wheel positioned on the left side of the three-gear main shaft gear; simultaneously, the second gear shifting deflector rod drives the second double-ratchet wheel to move leftwards, a ratchet wheel positioned at the left side of the second double-ratchet wheel is meshed with a ratchet wheel positioned at the right side of the four-gear main shaft gear, the four-gear main shaft gear drives the four-gear auxiliary shaft gear to rotate, the four-gear auxiliary shaft gear drives the auxiliary shaft and the reverse gear to rotate, the reverse gear drives the direct-drive gear on the main shaft to rotate, and the output sprocket wheel rotates;

4) When the gear is shifted from the fourth gear to the fifth gear, the gear shifting drum is rotated, the second gear shifting deflector rod drives the second double-ratchet to move rightwards, and the ratchet positioned on the left side of the second double-ratchet is separated from the ratchet positioned on the right side of the four-gear main shaft gear; simultaneously, the first gear shifting deflector rod drives the first double-ratchet wheel to move leftwards, and a ratchet wheel positioned at the left side of the first double-ratchet wheel is meshed with a ratchet wheel positioned at the right side of the five-gear main shaft gear; the five-gear main shaft gear drives the five-gear auxiliary shaft gear to rotate, the five-gear auxiliary shaft gear drives the auxiliary shaft and the reverse gear to rotate, the reverse gear drives the direct-drive gear on the main shaft to rotate, and the output sprocket wheel rotates;

5) When the gear is shifted from the fifth gear to the fourth gear, the gear shifting drum is reversely rotated, the first gear shifting deflector rod drives the first double-ratchet wheel to move rightwards, and the ratchet wheel positioned on the left side of the first double-ratchet wheel is separated from the ratchet wheel positioned on the right side of the fifth gear main shaft gear; simultaneously, the second gear shifting deflector rod drives the second double-ratchet wheel to move leftwards, and a ratchet wheel positioned at the left side of the second double-ratchet wheel is meshed with a ratchet wheel positioned at the right side of the four-gear main shaft gear; the four-gear main shaft gear drives the four-gear auxiliary shaft gear to rotate, the four-gear auxiliary shaft gear drives the auxiliary shaft and the reverse gear to rotate, the reverse gear drives the direct-drive gear on the main shaft to rotate, and the output sprocket wheel rotates;

6) When the gear is shifted from the fourth gear to the third gear, the gear shifting drum is reversely rotated, the second gear shifting deflector rod drives the second double-ratchet to move rightwards, and the ratchet positioned on the left side of the second double-ratchet is separated from the ratchet positioned on the right side of the fourth-gear main shaft gear; simultaneously, the first gear shifting deflector rod drives the first double-ratchet wheel to move rightwards, and a ratchet wheel positioned on the right side of the first double-ratchet wheel is meshed with a ratchet wheel on the left side of the three-gear main shaft gear; the three-gear main shaft gear drives the three-gear auxiliary shaft gear to rotate, the three-gear auxiliary shaft gear drives the auxiliary shaft and the reverse gear to rotate, the reverse gear drives the direct-drive gear on the main shaft to rotate, and the output sprocket wheel rotates;

7) When the gear is shifted from the third gear to the second gear, the gear shifting drum is reversely rotated, the first gear shifting deflector rod drives the first double-ratchet wheel to move leftwards, and the ratchet wheel positioned on the right side of the first double-ratchet wheel is separated from the ratchet wheel positioned on the left side of the third-gear main shaft gear; simultaneously, the second gear shifting deflector rod drives the second double-ratchet wheel to move rightwards, and the ratchet wheel positioned at the right side of the second double-ratchet wheel is meshed with the ratchet wheel positioned at the left side of the direct-drive gear; the direct-drive gear directly rotates through an output chain wheel fixed on the direct-drive gear;

8) When the gear is shifted from the second gear to the first gear, the gear shifting drum is reversely rotated, the second gear shifting deflector rod drives the second double-ratchet wheel to move leftwards, and the ratchet wheel positioned on the right side of the second double-ratchet wheel is separated from the ratchet wheel positioned on the left side of the direct-drive gear; meanwhile, as the rotation degree of the first gear is smaller than that of the first gear, the first-gear auxiliary shaft gear and the one-way clutch are in a combined state; the first-gear main shaft gear drives the first-gear auxiliary shaft gear to rotate, the first-gear auxiliary shaft gear drives the auxiliary shaft and the reverse gear to rotate, the reverse gear drives the direct-drive gear on the main shaft to rotate, and the output sprocket wheel rotates;

9) And cycling, wherein in different initial states, the ratchet wheel combination positions correspond to the different specific states.

By adopting the gear shifting method of the technical scheme, the operation is simple, the gear shifting operation is performed firstly in the gear shifting process, and the one-way clutch of the first gear slips in a split state after the gear shifting of the second gear is completed. The gear shifting mode can shift gears under the condition of load, and the gear shifting at any time is realized. Meanwhile, the gear shifting process is simple to operate, and the safety during gear shifting is greatly improved. And the gear shifting process time is short, and the gear shifting is realized by shifting the gear shifting drum wheel.

When the gear is shifted, the gear of the gear drives the ratchet wheel of the gear to rotate, and when the gear is shifted, the rotating speed of the ratchet wheel of the gear is high, the stress surface of the ratchet wheel becomes the tooth back, and the direction of force generated by the tooth back is far away from the tooth root, so that the gear of the gear can be pushed to the direction far away from the ratchet wheel of the first gear.

The tooth profile of the ratchet teeth mentioned in the present utility model is the same as the "ratchet teeth" in what is known as "ratchet teeth", namely: the angles of the two flanks are different so that one and only one flank can transmit torque. The direction of the ratchet arrangement of the present utility model is different from the conventional one: the ratchet is annular, but the tips of the teeth are directed sideways, with a specific angle being such that torque can be transmitted between the sleeve and the gear.

For the prior art, the technical scheme has the effects that firstly, the spring plate or the torsion spring on the deflector rod is utilized to drive the shifting fork, so that tooth striking or clamping caused by hard contact of the ratchet teeth is avoided; secondly, the bicycle rider's foot-reversing habit is facilitated. Because the spring plate or the torsion spring on the shifting rod drives the shifting fork to control the ratchet wheel to be meshed with the lateral ratchet teeth of the gear, when the inverted foot reverses the main shaft, the back of the tooth between the ratchet wheel and the lateral ratchet teeth of the gear has thrust force, and the spring plate or the torsion spring can enable the ratchet wheel controlled by the shifting fork to be separated from the gear in the axial direction through deformation; thirdly, the gear shifting mechanism has a static gear shifting function, and even in a non-rotary motion state, due to the deformation function of the elastic sheet or the torsion spring on the deflector rod, any gear can be switched to other gears; fourth, the gear is shifted under load, and when the gear is shifted, the gear is automatically separated from the low gear after the high gear enters the gear according to the speed difference principle. During gear reduction, gear reduction can be performed in advance and in an override mode, even when the gear is operated in a high gear, the shift lever can be shifted to a low gear, at the moment, the elastic sheet and the torsion spring on the low gear shift lever deform, a ratchet wheel and a gear lateral ratchet of the low gear are in a semi-clutch state, when the gear is stopped and stepped on, the load is 0, the gear in the high gear is separated from the ratchet wheel in an inertial mode, and when the gear is stepped on again, the ratchet wheel and the gear lateral ratchet of the low gear are immediately combined to transmit torsion.

Drawings

FIG. 1 is a schematic structural view of a spindle;

FIG. 2 is a schematic structural view of a secondary shaft;

FIG. 3 is an assembly schematic of the main shaft with the main shaft gear assembled with the auxiliary shaft;

FIG. 4 is an assembled schematic view of the main shaft with the output sprocket assembled with the countershaft with the shift drum assembled therewith;

FIG. 5 is a schematic rear view of the structure of FIG. 4;

FIG. 6 is a schematic structural view of a direct drive gear;

FIG. 7 is a schematic structural view of gears including a three speed spindle gear, a four speed spindle gear, a five speed spindle gear; a reversing gear; a three-gear countershaft gear; a fourth gear countershaft gear; five-gear auxiliary shaft gear;

FIG. 8 is a schematic view of the structure of a ratchet wheel; the ratchet comprises a first double-ratchet; a second double-ratchet;

FIG. 9 is an enlarged schematic view showing the structure of the metal spring plate of the elastic connecting piece;

FIG. 10 is an enlarged schematic cross-sectional view of E-E of FIG. 2;

FIG. 11 is an enlarged schematic view at C in FIG. 2;

fig. 12 is an enlarged schematic view showing the structure in which the elastic connection member is a torsion spring.

In the figure, 1 is a main axis; 11 is a first gear spindle gear; 12 is a direct drive gear; 13 is a three-gear spindle gear; 14 is a four-speed spindle gear; 15 is a five-gear main shaft gear; 18 is a first double-ratchet; 19 is a second double-ratchet;

2 is a secondary shaft; 21 is a first gear countershaft gear; 22 is a counter gear; 23 is a three speed countershaft gear; 24 is a four speed countershaft gear; 25 is a five speed countershaft gear; 28 is a one-way clutch;

3 is an output sprocket;

4 is a shift drum; reference numeral 41 denotes a first shift lever; 42 is a second shift lever; 44 is a shift drum groove; 45 is a shift fork; 453 is a metal spring; 454 is a compression spring; 455 is a fork guide bar; 456 is a torsion spring body; 457 is the torsion spring output end; 211 is a one-way clutch inner ratchet; 212 is a one-way clutch pawl; 213 is a one-way clutch detent shaft; 214 are one-way clutch compression springs.

51 is an upper fixing plate; 52 is a lower fixing plate; 53 is a locating plate;

Detailed Description

The technical scheme of the utility model is further described below by means of the attached drawings and examples.

1-12, a bicycle gearbox transmission device with load speed change comprises a main shaft 1, a countershaft 2 and an output sprocket 3, wherein a first-gear main shaft gear 11, a fifth-gear main shaft gear 15, a third-gear main shaft gear 13, a fourth-gear main shaft gear 14 and a direct drive gear 12 are arranged on the main shaft 1 from left to right, a first double-ratchet wheel 18 is arranged between the fifth-gear main shaft gear 15 and the third-gear main shaft gear 13, a second double-ratchet wheel 19 is arranged between the fourth-gear main shaft gear 14 and the direct drive gear 12, wherein the first-gear main shaft gear 11 is fixedly connected to the main shaft 1, the fifth-gear main shaft gear 15, the third-gear main shaft gear 13, the fourth-gear main shaft gear 14 and the direct drive gear 12 are sleeved on the main shaft 1 in an empty mode, and the first double-ratchet wheel 18 and the second double-ratchet wheel 18 are sleeved on the main shaft 1 in a sliding mode; a first-gear auxiliary shaft gear 21, a five-gear auxiliary shaft gear 25, a three-gear auxiliary shaft gear 23, a four-gear auxiliary shaft gear 24 and a reverse gear 22 are arranged on the auxiliary shaft 2 from left to right, the first-gear auxiliary shaft gear 21 is sleeved on a one-way clutch 28, and the one-way clutch 28 is fixedly sleeved on the auxiliary shaft 2; wherein, the five-gear auxiliary shaft gear 25, the three-gear auxiliary shaft gear 23, the four-gear auxiliary shaft gear 24 and the reverse gear 22 are fixedly connected on the auxiliary shaft 2; the first double-ratchet wheel 18 and the second double-ratchet wheel 19 move left and right on the main shaft and are respectively meshed with/separated from the two main shaft gears of the single ratchet wheel through ratchet teeth on two sides; one of the main shaft gears is a direct drive gear, and the output chain wheel is fixed on the direct drive gear; the ratchets are helical teeth.

In the second embodiment, as shown in fig. 1 to 12, a gearbox of a bicycle gearbox transmission device with a load speed change is adopted, and the gearbox comprises a box type gearbox and a gear shifting device, wherein the box type gearbox comprises a box body, a main shaft 1, a countershaft 2 and an output sprocket 3, the gearbox is a five-gear gearbox, five driving gears of a first gear main gear 11, a five-gear main gear 15, a three-gear main gear 13, a four-gear main gear 14 and a direct-drive gear 12 are arranged on the main shaft from left to right, a first double-ratchet wheel 18 is arranged between the five-gear main gear and the three-gear main gear, a second double-ratchet wheel 19 is arranged between the four-gear main gear 14 and the direct-drive gear 12, the first gear main gear is fixedly connected to the main shaft or integrally formed with the main shaft, the five-gear main gear 15, the three-gear main gear 13, the four-gear main gear 14 and the direct-drive gear 12 are sleeved on the main shaft 1 in a hollow manner, and the first double-ratchet wheel 18 and the second double-ratchet wheel 19 are sleeved on the main shaft 1 in a sliding manner; the auxiliary shaft 2 is provided with five auxiliary shaft gears including a first-gear auxiliary shaft gear 21, a five-gear auxiliary shaft gear 25, a three-gear auxiliary shaft gear 23, a four-gear auxiliary shaft gear 24 and a reverse gear 22 from left to right, the first-gear auxiliary shaft gear 21 is sleeved on a one-way clutch 28, and the one-way clutch 28 is fixedly sleeved on the auxiliary shaft 2; the one-way clutch 28 is of a common structure and comprises one-way clutch inner ratchets 211, one-way clutch pawls 212, one-way clutch pawl shafts 213 and one-way clutch pressure springs 214, wherein the one-way clutch inner ratchets 211 are combined on the inner ring of the one-way clutch, the one-way clutch pawls 212 are fixed on the outer ring of the one-way clutch 28 through the one-way clutch pawl shafts 213, the one-way clutch pressure springs 214 are arranged between the outer ring of the one-way clutch 28 and the one-way clutch pawls 212, the outer ring of the one-way clutch 28 is assembled with the inner ring of the one-gear auxiliary shaft gear 21 in a matched manner, and the one-way clutch 28 is fixedly connected on the auxiliary shaft 2; the five-gear auxiliary shaft gear 25, the three-gear auxiliary shaft gear 23, the four-gear auxiliary shaft gear 24 and the reverse gear 22 are fixedly connected to the auxiliary shaft 2, and the main shaft gear and the auxiliary shaft gear are mutually matched and meshed; a poking groove is arranged between the two driving ratchets, namely the first double-ratchet 18 and the second double-ratchet 19; the ratchets are helical teeth.

The gear shifting device comprises a gear shifting drum 4, a first gear shifting rod 41, a second gear shifting rod 42, two gear shifting forks 45, an upper fixing plate 51, a lower fixing plate 52 and a fork guide rod 455, wherein the gear shifting drum is rotationally fixed on a box body, two ends of a main shaft and a secondary shaft are mounted on the box body through bearings, the gear shifting forks can be movably fixed on the box body in a left-right moving manner, the rotation center lines of the gear shifting drum and the rotation center lines of the secondary shaft are parallel to each other, the upper fixing plate 51 and the lower fixing plate 52 are fixed on the box body under the condition of not interfering with gear rotation, the fork guide rod 455 is fixed on the upper fixing plate 51 and the lower fixing plate 52, the fork connecting part 452 is a hollow tube, and the hollow tube is movably sleeved on the fork guide rod 455. The two ends of the main shaft 1 and the auxiliary shaft 2 are arranged on the box body through bearings, and the two gear shifting levers of the first gear shifting lever 41 and the second gear shifting lever 42 can move left and right and are movably fixed on the box body;

the gear shifting drum 4 is provided with a gear shifting drum groove 44 on the circumferential surface, the gear shifting fork comprises a lower-section fork part 451 and an upper-section fork connecting part 452, the fork part 451 is clamped in the middle of the ratchet wheel in the gear shifting groove, the front ends of the first gear shifting rod 41 and the second gear shifting rod 42 are movably fixed in the gear shifting drum groove 44, the rear ends of the first gear shifting rod 41 and the second gear shifting rod 42 are elastically and movably connected at the fork connecting part 452, namely, the gear shifting rod and the connecting piece of the fork are elastic connecting pieces, in the embodiment, the elastic connecting pieces are metal elastic pieces 453, the upper ends of the metal elastic pieces 453 are connected with the gear shifting rod 42, and the lower ends of the metal elastic pieces 453 are connected with the gear shifting fork.

In the third embodiment, as shown in fig. 12, in the above technical solution, the elastic connection member is a torsion spring, the torsion spring includes a torsion spring body 456 and a torsion spring output end 457, the torsion spring body 456 is fixedly connected to the gear shifting lever 42, and the torsion spring output end 457 clamps the gear shifting fork.

In addition, by adopting the technical scheme of the utility model, the gear shifting deflector rod and the shifting fork guide rod can be movably fixed on the box body in a left-right manner, and the positions of the gear shifting deflector rod and the shifting fork guide rod are not fixed by adopting the fixing plate, so long as the gear shifting deflector rod and the shifting fork guide rod can only move left and right but cannot move up and down and back and forth.

The utility model relates to a gear shifting method of a bicycle gearbox transmission device with load speed change,

1) When the gearbox is in a starting first gear position, the first double-ratchet wheel and the second double-ratchet wheel are in a separated state with corresponding gears, and the first auxiliary shaft gear and the one-way clutch are in a combined state;

2) When the gear is shifted from the first gear to the second gear, the gear shifting drum wheel 4 is rotated, the second gear shifting deflector rod 43 drives the second double-ratchet wheel to move rightwards, and the ratchet wheel positioned on the right side of the second double-ratchet wheel is meshed with the ratchet wheel positioned on the left side of the direct-drive gear; meanwhile, as the rotation degree of the second gear is larger than that of the first gear, the first gear auxiliary shaft gear and the one-way clutch are in a separation state; the power is directly rotated through an output chain wheel fixed on the direct-drive gear;

3) When the gear is shifted from the second gear to the third gear, the gear shifting drum 4 is rotated, the second gear shifting lever 43 drives the second double-ratchet 19 to move leftwards, and the ratchet on the right side of the second double-ratchet 19 is separated from the ratchet on the left side of the direct-drive gear 12; simultaneously, the first gear shifting deflector 41 drives the first double-ratchet wheel 18 to move rightwards, a ratchet wheel positioned on the right side of the first double-ratchet wheel 18 is meshed with a ratchet wheel positioned on the left side of the three-gear main shaft gear 13, the three-gear main shaft gear 13 drives the three-gear auxiliary shaft gear 23 to rotate, the three-gear auxiliary shaft gear 23 drives the auxiliary shaft 2 and the reverse gear 22 to rotate, the reverse gear 22 drives the direct-drive gear 12 which is sleeved on the main shaft 1 to rotate, and the output sprocket 3 rotates;

4) When the gear is shifted from the third gear to the fourth gear, the gear shifting drum wheel 4 is rotated, the first gear shifting lever 41 drives the first double-ratchet 18 to move leftwards, and the ratchet positioned on the right side of the first double-ratchet 18 is separated from the ratchet positioned on the left side of the third-gear main shaft gear 13; simultaneously, the second gear shifting deflector 42 drives the second double-ratchet 19 to move leftwards, the ratchet wheel positioned at the left side of the second double-ratchet 19 is meshed with the ratchet wheel positioned at the right side of the four-gear main shaft gear 14, the four-gear main shaft gear 14 drives the four-gear auxiliary shaft gear 24 to rotate, the four-gear auxiliary shaft gear 24 drives the auxiliary shaft 2 and the reverse gear 22 to rotate, the reverse gear 22 drives the direct-drive gear 12 which is sleeved on the main shaft to rotate, and the output sprocket 3 rotates;

5) When the gear is shifted from the fourth gear to the fifth gear, the gear shifting drum 4 is rotated, the second gear shifting lever 42 drives the second double-ratchet 19 to move rightwards, and the ratchet positioned at the left side of the second double-ratchet 19 is separated from the ratchet positioned at the right side of the fourth-gear main shaft gear 14; simultaneously, the first gear shifting lever 41 drives the first double-ratchet wheel 18 to move leftwards, and the ratchet wheel positioned at the left side of the first double-ratchet wheel 18 is meshed with the ratchet wheel positioned at the right side of the five-gear main shaft gear 15; the five-gear main shaft gear 15 drives the five-gear auxiliary shaft gear 25 to rotate, the five-gear auxiliary shaft gear 25 drives the auxiliary shaft 2 and the reverse gear 22 to rotate, the reverse gear 22 drives the direct-drive gear 12 which is sleeved on the main shaft 1 to rotate, and the output sprocket 3 rotates;

6) When the gear is shifted from the fifth gear to the fourth gear, the gear shifting drum 4 is reversely rotated, the first gear shifting deflector rod 41 drives the first double-ratchet wheel 18 to move rightwards, and the ratchet wheel positioned on the left side of the first double-ratchet wheel 18 is separated from the ratchet wheel positioned on the right side of the fifth gear main shaft gear 15; simultaneously, the second gear shifting deflector 42 drives the second double-ratchet 19 to move leftwards, and the ratchet wheel positioned at the left side of the second double-ratchet 19 is meshed with the ratchet wheel positioned at the right side of the four-gear main shaft gear 14; the four-gear main shaft gear 14 drives the four-gear auxiliary shaft gear 24 to rotate, the four-gear auxiliary shaft gear 24 drives the auxiliary shaft 2 and the reverse gear 22 to rotate, the reverse gear 22 drives the direct-drive gear 12 which is sleeved on the main shaft 1 to rotate, and the output sprocket 3 rotates;

7) When the gear is shifted from the fourth gear to the third gear, the gear shifting drum 4 is reversely rotated, the second gear shifting deflector rod 43 drives the second double-ratchet wheel 19 to move rightwards, and the ratchet wheel positioned at the left side of the second double-ratchet wheel 19 is separated from the ratchet wheel positioned at the right side of the fourth-gear main shaft gear 14; simultaneously, the first gear shifting lever 41 drives the first double-ratchet wheel 18 to move rightwards, and the ratchet wheel positioned on the right side of the first double-ratchet wheel 18 is meshed with the ratchet wheel positioned on the left side of the three-gear main shaft gear 13; the three-gear main shaft gear 13 drives the three-gear auxiliary shaft gear 23 to rotate, the three-gear auxiliary shaft gear 23 drives the auxiliary shaft 2 and the reverse gear 22 to rotate, the reverse gear 22 drives the direct-drive gear 12 which is sleeved on the main shaft 1 to rotate, and the output sprocket rotates;

8) When the gear is shifted from the third gear to the second gear, the gear shifting drum wheel 4 is reversely rotated, the first gear shifting deflector rod 41 drives the first double-ratchet wheel 18 to move leftwards, and the ratchet wheel positioned on the right side of the first double-ratchet wheel 18 is separated from the ratchet wheel positioned on the left side of the third-gear main shaft gear 13; simultaneously, the second gear shifting deflector 42 drives the second double-ratchet wheel 19 to move rightwards, and the ratchet wheel positioned on the right side of the second double-ratchet wheel 19 is meshed with the ratchet wheel on the left side of the direct-drive gear 12; the direct drive gear 12 is directly rotated by the output sprocket 3 fixed to the direct drive gear 12.

9) When the gear is shifted from the second gear to the first gear, the gear shifting drum is reversely rotated, the second gear shifting deflector rod drives the second double-ratchet wheel to move leftwards, and the ratchet wheel positioned on the right side of the second double-ratchet wheel is separated from the ratchet wheel positioned on the left side of the direct-drive gear; meanwhile, as the rotation degree of the first gear is smaller than that of the first gear, the first-gear auxiliary shaft gear and the one-way clutch are in a combined state; the first-gear main shaft gear drives the first-gear auxiliary shaft gear to rotate, the first-gear auxiliary shaft gear drives the auxiliary shaft and the reverse gear to rotate, the reverse gear drives the direct-drive gear on the main shaft to rotate, and the output sprocket wheel rotates;

1) And cycling, wherein in different initial states, the ratchet wheel combination positions correspond to the different specific states.

The above description of the specific embodiments is only intended to aid in understanding the method of the present utility model and its core concept, and it should be pointed out that it is possible for a person skilled in the art to make several improvements and modifications to the utility model, such as simple changes in the length of the sleeve and the angle of inclination of the tooth flanks, the number of teeth of the gear ratchet teeth and the number of teeth of the sleeve ratchet teeth, without departing from the principles of the utility model, which also fall within the scope of protection of the claims of the present utility model.

Claims

1. A bicycle transmission with load shifting, characterized in that: the device comprises a main shaft, a counter shaft and an output chain wheel, wherein a plurality of main shaft gears and driving ratchet wheels are arranged on the main shaft, a plurality of counter shaft gears and driven ratchet wheels are arranged on the counter shaft, a shifting groove is arranged between the driving ratchet wheel and the driven ratchet wheel, and the main shaft gears and the counter shaft gears are engaged in a matched manner; at least one of the driving ratchet wheel and the driven ratchet wheel is a double-ratchet wheel, two main shaft gears or two auxiliary shaft gears with single ratchet teeth are arranged on two sides of the double-ratchet wheel, and the double-ratchet wheel moves left and right on the main shaft or the auxiliary shaft and is respectively meshed with/separated from the two main shaft gears or the two auxiliary shaft gears of the single ratchet teeth through ratchet teeth on two sides; one of the main shaft gears is a direct drive gear, and the output chain wheel is fixed on the direct drive gear; the ratchets are helical teeth.

2. A load shifting bicycle transmission according to claim 1, wherein: the main shaft is provided with at least one gear main shaft gear, the auxiliary shaft is provided with at least one gear auxiliary shaft gear, at least one gear main shaft gear or one gear auxiliary shaft gear is sleeved on a one-way clutch, and the one-way clutch is fixedly sleeved on the corresponding main shaft or auxiliary shaft.

3. A bicycle transmission gear with load shifting according to claim 1 or 2, characterized in that: the main shaft is provided with a first-gear main shaft gear, a five-gear main shaft gear, a three-gear main shaft gear, a four-gear main shaft gear and a direct drive gear from left to right, a first double-ratchet wheel is arranged between the five-gear main shaft gear and the three-gear main shaft gear, a second double-ratchet wheel is arranged between the four-gear main shaft gear and the direct drive gear, wherein the first-gear main shaft gear is fixedly connected to the main shaft, the five-gear main shaft gear, the three-gear main shaft gear, the four-gear main shaft gear and the direct drive gear are sleeved on the main shaft in an empty mode, and the first double-ratchet wheel and the second double-ratchet wheel are sleeved on the main shaft in a sliding mode; a first-gear auxiliary shaft gear, a five-gear auxiliary shaft gear, a three-gear auxiliary shaft gear, a four-gear auxiliary shaft gear and a reverse gear are arranged on the auxiliary shaft from left to right, the first-gear auxiliary shaft gear is sleeved on a one-way clutch, and the one-way clutch is fixedly sleeved on the auxiliary shaft; the five-gear auxiliary shaft gear, the three-gear auxiliary shaft gear, the four-gear auxiliary shaft gear and the reverse gear are fixedly connected to the auxiliary shaft.

4. A gearbox for a bicycle gearbox transmission with load shifting according to claim 1, wherein: the gear shifting device comprises a gear shifting drum, a gear shifting rod and a gear shifting fork, wherein the gear shifting drum is rotationally fixed on a box body, two ends of a main shaft and a secondary shaft are installed on the box body through bearings, the gear shifting rod can be movably fixed on the box body in a left-right moving mode, the rotation center line of the gear shifting drum is parallel to the rotation center line of the secondary shaft, a gear shifting drum wheel groove is formed in the circumferential surface of the gear shifting drum, the gear shifting fork comprises a lower-section shifting fork part and an upper-section shifting fork connecting part, the shifting fork part is clamped in a shifting groove in the middle of a ratchet wheel, the front end of the gear shifting rod is movably fixed in the gear shifting drum groove, the rear end of the gear shifting rod is movably connected with the shifting fork connecting part, and a connecting piece of the gear shifting rod and the shifting fork is an elastic connecting piece.

5. A gearbox for a bicycle gearbox transmission for on-load shifting according to claim 4 and wherein: the elastic connecting piece is a metal spring piece, the upper end of the metal spring piece is fixedly connected to the gear shifting rod, and the lower end of the metal spring piece movably clamps the gear shifting fork.

6. A gearbox for a bicycle gearbox transmission for on-load shifting according to claim 4 and wherein: the elastic connecting piece is a torsion spring, the torsion spring comprises a torsion spring body and a torsion spring output end, the torsion spring body is fixedly connected to the gear shifting deflector rod, and the gear shifting fork is movably clamped by the torsion spring output end.

7. A gearbox for a bicycle gearbox transmission for on-load shifting according to claim 5 and wherein: the gear shifting device further comprises a fixing plate and a shifting fork guide rod, wherein the fixing plate is fixed on the box body, the shifting fork guide rod is fixed on the fixing plate or directly fixed on the box body, the shifting fork connecting portion is a hollow tube, and the hollow tube is movably sleeved on the shifting fork guide rod.

8. A gearbox for a bicycle gearbox transmission for on-load shifting according to claim 5 and wherein: the gear shifting rod and the gear shifting fork are two, wherein the first gear shifting rod controls the first double-ratchet wheel, and the second gear shifting rod controls the second double-ratchet wheel.