阅读说明：本技术 往复变圆周运动的单齿条传动自行车 (Single-rack transmission bicycle with reciprocating variable circular motion ) 是由 董建国 其他发明人请求不公开姓名 于 2021-08-10 设计创作，主要内容包括：本发明公开了一种往复变圆周运动的单齿条传动自行车,其传动机构可用于自行车、三轮车以及其它能使用齿条传动的机械上,包括左右脚踏、左右脚踏曲柄、左右脚踏交替装置、单根齿条、往复变圆周装置和变速装置以及倒车装置,往复变圆周装置将齿条的往复运动转变为圆周运动,变速装置可实现圆周运动的高低速切换,倒车装置可实现无需做类似抬高齿条这样的配合动作即可倒车。其特点是将脚踏的上下运动转换为齿条的往复运动,再通过往复变圆周装置高效、低噪音地转换为圆周运动；齿轮和齿条可密封起来,既减少油污又能实现充分润滑；不会有“掉链子”的问题；单根齿条相当于传统自行车的大齿盘,可实现无级变速功能。(The invention discloses a single-rack transmission bicycle with reciprocating circular motion, wherein a transmission mechanism of the bicycle can be used for bicycles, tricycles and other machines capable of using rack transmission, and the bicycle comprises a left pedal, a right pedal, a left pedal crank, a right pedal alternating device, a single rack, a reciprocating circular motion changing device, a speed changing device and a reversing device, wherein the reciprocating circular motion changing device changes the reciprocating motion of the rack into circular motion, the speed changing device can realize high-low speed switching of the circular motion, and the reversing device can realize reversing without the matching action like lifting the rack. The reciprocating motion of the rack is converted into the reciprocating motion of the rack by the reciprocating motion device, and then the reciprocating motion is converted into the circular motion with high efficiency and low noise; the gear and the rack can be sealed, so that oil contamination is reduced, and sufficient lubrication can be realized; the problem of chain dropping is avoided; the single rack is equivalent to a big fluted disc of the traditional bicycle, and the stepless speed change function can be realized.)

1. The utility model provides a reciprocating become single rack-driven bicycle of circular motion, pedal crank about including about pedal and being connected with it, about pedal crank connects about pedal alternating means, the pivot portion of right side pedal crank is through pedal crank and rack connecting rod (9) one end of being connected single rack (10) between rack, the other end of rack (10) and reciprocating become the reciprocal gear wheel (14) mesh of circular motion device, its characterized in that:

the power output by the first shaft (17) of the reciprocating circumference changing device is transmitted to a third shaft (19) of the speed changing device through a reversing device (20), and the rear wheels (12) are driven to rotate after the speed is changed by the speed changing device;

the reciprocating circumference changing device comprises a reciprocating large gear (14), a first shaft one-way bearing (21) and a second shaft one-way bearing (22) of which the outer rings are fixed on the inner wall of a mounting hole, a first shaft face gear (15) fixed on a first shaft (17) and a second shaft face gear (16) fixed on a second shaft (18) are parallel to each other in reference plane and are simultaneously meshed with an intermediate gear (30) arranged between the first shaft and the second shaft, an intermediate gear fixing shaft (31) penetrates through the mounting hole of the intermediate gear (30) and is fixed in position, a distance between the first shaft one-way bearing (21) fixed on the first shaft (17) and the inner ring of the one-way bearing (22) fixed on the second shaft (18) is kept without a contact surface, the first shaft one-way bearing (21) and the second shaft one-way bearing (22) are opposite in one-way rotating direction, the second shaft (18) is a cylindrical hollow shaft and is coaxial with the first shaft (17), the length of the shaft is shorter than that of the first shaft (17), the inner diameter of the shaft is larger than the outer diameter of the first shaft (17), and the second shaft (18) can freely rotate on the first shaft (17).

2. The reciprocating variable circular motion single rack drive bicycle of claim 1, wherein: the left and right pedal alternating device comprises a right arc-shaped rack and supporting rod (3) and a left arc-shaped rack and supporting rod (6) which are parallel to each other on a reference plane, a pedal alternating gear (7) which is meshed with the right arc-shaped rack and the supporting rod simultaneously, and a pedal alternating gear fixing shaft (8) which penetrates through a mounting hole of the pedal alternating gear (7) and is fixed in position, wherein the pedal alternating gear (7) is a cylindrical gear and is arranged between the right arc-shaped rack and the left arc-shaped rack.

3. The reciprocating variable circular motion single rack drive bicycle of claim 1, wherein: the first axial face gear (15), the second axial face gear (16), the intermediate gear (30) and the intermediate gear fixing shaft (31) of the reciprocating circumference changing device are all installed on one side of the reciprocating large gear (14), and the reversing device, the speed changing device and the rear wheel are all installed on the other side of the reciprocating large gear (14).

4. The reciprocating variable circular motion single rack drive bicycle of claim 1, wherein: the reciprocating variable circumference device is characterized in that a journal is machined at the position, where a first shaft one-way bearing (21) is installed, on a first shaft (17), the journal is coaxial with the first shaft (17), the outer diameter of the journal is the same as that of a second shaft (18), the width of the journal is larger than that of the first shaft one-way bearing (21), and a non-contact surface is kept away from the second shaft (18).

5. The reciprocating variable circular motion single rack drive bicycle of claim 1, wherein: the speed change device comprises a third shaft low-speed change gear (23), a bidirectional face gear (27), a key (29), a third shaft high-speed change gear (25) which are sequentially arranged on a third shaft (19), and a rear wheel shaft low-speed change gear (24) and a rear wheel shaft high-speed change gear (26) which are sequentially fixed on a rear wheel shaft (13), wherein sliding balls of shifting forks (28) are arranged in middle grooves of the bidirectional face gear (27) of which two side surfaces are face gears and the middle is a smooth groove, the third shaft (19) is connected to the first shaft (17) by the reversing device (20), and the third shaft low-speed change gear (23) is meshed with the rear wheel shaft low-speed change gear (24); the third shaft high speed change gear (25) is engaged with the rear wheel shaft high speed change gear (26), and the fork (28) can enable the bidirectional face gear (27) to freely slide along a key (29) on the third shaft (19).

6. The reciprocating variable circular motion single rack drive bicycle of claim 1, wherein: the reversing device comprises a reversing device first face gear (32) and a reversing device second face gear (33) which are meshed with each other, a screw rod (36) is fixed at the central position of the end face of a first shaft (17), the outer ring edge of a sliding ring (34) is fixed on the end face of the reversing device first face gear (32), the inner ring edge of the sliding ring is in low-friction contact with the screw rod (36), one end of a spring (35) sleeved on the screw rod (36) is pressed on the end face of the reversing device first face gear (32), and the other end of the spring is pressed on the end face of the first shaft (17); the screw rod accommodating cavity (37) is of a cylindrical structure, the inner cavity of the screw rod accommodating cavity can completely accommodate the screw rod (36), one end of the screw rod accommodating cavity is fixed on the end face of the second face gear (33) of the reversing device, and the other end of the screw rod accommodating cavity is fixed on the end face of the third shaft (19).

7. The reciprocating variable circular motion single rack drive bicycle of claim 2, wherein: the support rods of the right arc-shaped rack or/and the left arc-shaped rack can be fixed on the straight rod of the non-rotating shaft part of the pedal crank, or the support rods of the right arc-shaped rack or/and the left arc-shaped rack can be removed and directly fixed on the straight rod of the non-rotating shaft part of the pedal crank.

8. The reciprocating variable circular motion single rack drive bicycle of claim 2, wherein: the right side arc rack or/and the left side arc rack can be replaced by a sector gear, the support rod can be fixed on a straight rod of a non-rotating shaft part of the pedal crank, or the support rod can be removed, and the sector gear is directly fixed on the pedal crank.

9. The reciprocating variable circular motion single rack drive bicycle of claim 1, wherein: the reference planes of the reciprocating variable circumference device are parallel to each other, a first axial face gear (15) fixed on a first shaft (17) and a second axial face gear (16) fixed on a second shaft (18) are simultaneously meshed with an intermediate gear (30) arranged between the first axial face gear and the second axial face gear, and the first axial face gear (15) is replaced by a sun gear fixed on the first shaft (17), the second axial face gear (16) is replaced by an inner gear ring fixed on the second shaft (18), and the intermediate gear (30) is replaced by a planetary gear.

10. The reciprocating variable circular motion single rack drive bicycle of claim 1, wherein: the reference planes of the reciprocating circumference changing device are mutually parallel, a first axial face gear (15) fixed on a first shaft (17) and a second axial face gear (16) fixed on a second shaft (18) are simultaneously meshed with an intermediate gear (30) arranged between the first axial face gear and the second axial face gear, the transmission can be realized through three conical gears, wherein the first axial face gear (15) and the second axial face gear (16) are respectively replaced by two conical gears with parallel end faces, the end face of a third conical gear used for replacing the intermediate gear (30) is perpendicular to the end faces of the first two conical gears, and two phases of the three conical gears are meshed.

Technical Field

The invention relates to a single-rack transmission bicycle with reciprocating circular motion, in particular to a transmission mode which uses a rack, a gear and other components to change the up-and-down motion of a pedal into the reciprocating motion of a single rack, and then converts the reciprocating motion of the rack into the circular motion so as to drive the bicycle to move forwards.

Background

A plurality of ways of converting circular motion into reciprocating motion can be searched, so that the circular-to-reciprocating motion is not difficult to realize; however, the way of converting the reciprocating motion into the circular motion often has certain defects, such as: 1. in the switching process of the motion direction of the reciprocating motion, some mechanisms have the problem of transmission dead points, and some transmission gears and other mechanisms have the condition of tooth striking or impact; 2. under the condition that the reciprocating motion needs to be stopped at any time or even the motion direction needs to be switched at any time, for example, when a rack is used for replacing a chain of a bicycle for transmission, a pedal can be stopped or reversed at any time, and a plurality of modes of converting the reciprocating motion into circular motion are difficult to meet the requirement.

The main disadvantage of the chain transmission commonly used on the bicycles at present is that the chain falls off or is disconnected, and if the bicycle running at high speed has the condition of chain falling, safety accidents can possibly happen; secondly, the chain that lacks lubricating oil can rust, and rusty chain not only can increase driven loss, and the chain probably breaks off moreover, so should in good time add lubricating oil to the chain, but the chain exposes in the air, has added lubricating oil after, lubricating oil can mix material such as dust in the air gradually and lead to the chain to become seriously dirty, and then has increased driven loss.

There are many proposals for replacing bicycle chains, such as shaft drives, bevel gear drives, etc. The bevel gear transmission and the helical gear transmission need larger power and are not suitable for manpower. The shaft transmission cost is high, and the shaft transmission bicycle is mainly used in high-grade vehicles with large power, and a novel shaft transmission bicycle is provided at present, a large gear disc connected with pedals is changed into a face gear, and power is transmitted to rear wheels through the gear and a shaft, and the design possibly has the problems that 1, when the gear is not meshed in place during speed change, the speed change possibly fails; 2. the gear meshing is inevitably required to be lubricated, and the gear teeth of each gear are exposed outside, so that the conditions of serious dirt and even influence on use are inevitable; 3. after the bicycle is collided, the shaft is easy to deform, and the use of shaft transmission can be influenced.

Compared with the pedal circular rotation, the pedal up-and-down alternate movement has the advantages that: when the crank of the pedal is in a right angle with the lower leg of a rider, the big fluted disc connected with the crank of the pedal has the maximum torque, the efficiency of manpower is highest at the moment, the big fluted disc only has the maximum torque at two points when rotating a circle, and the efficiency is highest, if the pedal moves up and down alternately, the crank moves up and down near the point with the maximum torque, and higher efficiency can be obtained; and the alternative movement of the pedals up and down is more in line with the habit of exerting force on the lower limbs of the human body.

At present, a design idea that pedals rotating circumferentially are replaced by a plurality of pedals alternating up and down is provided, but the main idea is that the tail end of a pedal crank moves backwards to the position of a rear wheel or is directly placed on a rear wheel shaft. The former can cause the crank of the pedal to be longer, which affects the practicability; the latter can cause the rear wheel axle of the bicycle to be close to the position right below the saddle, so that the length of the bicycle has to be shortened, the comfort of the bicycle is reduced, if the rear frame of the bicycle is added to carry goods, the bicycle is difficult to carry, and the development direction can be changed into a folding bicycle.

In the rack reciprocating transmission mode, two bicycle flywheels respectively mounted on two shafts can be used, one of the two flywheels can only rotate clockwise, the other can only rotate anticlockwise, two gears with the diameter larger than that of the flywheels are respectively fixed on the two shafts and are meshed with each other, and the two bicycle flywheels are meshed with the rack. The disadvantages are that: 1. the overall volume and weight of each gear part of the reciprocating variable circular motion part are larger, so that the gear part is heavier; 2. two gears larger than the flywheel are required to be meshed with each other, and unnecessary volume and weight are increased in transmission; 3. two flywheels are needed, one flywheel always needs to rotate in a one-way mode in the reciprocating process of the rack, like the state that the bicycle is pedaled still and the rear wheel rotates due to inertia, the pawl of the flywheel slides on the gear teeth of the ratchet wheel to generate continuous 'click' sound, the noise always accompanies the whole transmission process, and the flywheel is not practical if put into practical use; 4. the two flywheels need to be meshed with the rack, the requirements on the positions of the rack and the two flywheels are high, and the practicability in transmission is poor; 5. such a transmission would result in the rear wheel not being able to reverse, and perhaps lifting the rack out of contact with the two flywheels would be a solution, but this would lead to new drawbacks.

The present invention uses a one-way bearing as a component of one-way rotation, wherein the one-way bearing is a bearing which can freely rotate in one direction and is locked in the other direction, and is also called an overrunning clutch, and a metal shell of the one-way bearing contains a plurality of rolling shafts, rolling needles or rolling balls, and rolling seats (cavities) of the one-way bearing are shaped to roll only in one direction, and generate great resistance in the other direction (namely, form a so-called one-way direction).

Disclosure of Invention

The invention aims to solve the technical problems that a chain is easy to drop and even break, an exposed chain in air is easy to stain and rust so as to cause transmission loss and the like in the prior art, and technical problems that the utilization efficiency of the force of a circular rotating pedal on the lower limbs of a human body is not high, the transmission efficiency is low and the like, and provides a transmission scheme capable of replacing the circular rotating mode of the chain and the pedal in a bicycle.

The invention provides a reciprocating variable circular motion single-rack transmission bicycle, which adopts the following technical scheme:

a single-rack transmission bicycle with reciprocating variable circular motion comprises left and right pedals, left and right pedal cranks connected with the left and right pedals, a left and right pedal alternating device connected with the left and right pedal cranks, a rotating shaft part of the right pedal crank is connected with one end of a single rack through a connecting rod between the pedal cranks and the rack, the other end of the rack is meshed with a reciprocating large gear of the reciprocating variable circular device,

the method is characterized in that:

the power output by the first shaft of the reciprocating variable circumference device is transmitted to the third shaft of the speed change device through the reversing device, and the power is changed by the speed change device and then drives the rear wheels to rotate;

the reciprocating circumference-variable device comprises a reciprocating large gear, a first shaft one-way bearing and a second shaft one-way bearing, wherein an outer ring of the first shaft one-way bearing and the second shaft one-way bearing are fixed on the inner wall of a mounting hole, reference planes of a first shaft face gear fixed on the first shaft and a second shaft face gear fixed on the second shaft are mutually parallel and are simultaneously meshed with an intermediate gear arranged between the first shaft one-way bearing and the second shaft one-way bearing, an intermediate gear fixing shaft penetrates through the mounting hole of the intermediate gear and is fixed in position, a distance between the first shaft one-way bearing fixed on the first shaft and an inner ring of the one-way bearing fixed on the second shaft is kept without a contact surface, the first shaft one-way bearing and the second shaft one-way bearing are opposite in one-way rotating direction, the second shaft is a cylindrical hollow shaft and is coaxial with the first shaft, the length of the second shaft is shorter than that of the first shaft, the inner diameter of the second shaft is larger than that of the first shaft, and the second shaft can freely rotate on the first shaft.

The left and right pedal alternating device comprises a right arc-shaped rack and a supporting rod which are parallel to each other on a reference plane, a left arc-shaped rack and a supporting rod, pedal alternating gears which are meshed with the right arc-shaped rack and the supporting rod simultaneously, and a pedal alternating gear fixing shaft which penetrates through a mounting hole of the pedal alternating gears and is fixed in position, wherein the pedal alternating gears are cylindrical gears and are arranged between the right arc-shaped rack and the left arc-shaped rack.

The first axial face gear, the second axial face gear, the middle gear and the middle gear fixing shaft of the reciprocating circumference changing device are all arranged on one side of the reciprocating big gear, and the reversing device, the speed changing device and the rear wheel are all arranged on the other side of the reciprocating big gear.

The reciprocating circumference-variable device is characterized in that a journal is processed at the position of a first shaft on which a first shaft one-way bearing is installed, the journal and the first shaft have the same axle center, the outer diameter of the journal is the same as that of a second shaft, the width of the journal is larger than that of the first shaft one-way bearing, and a non-contact surface is kept away from the second shaft.

The speed change device comprises a third shaft low-speed change gear, a bidirectional face gear, a key, a third shaft high-speed change gear, a rear axle low-speed change gear and a rear axle high-speed change gear, wherein the third shaft low-speed change gear, the bidirectional face gear, the rear axle low-speed change gear and the rear axle high-speed change gear are sequentially arranged on a third shaft; the third shaft high-speed change gear is meshed with the rear wheel shaft high-speed change gear, and the shifting fork can enable the bidirectional face gear to freely slide along keys on the third shaft.

The reversing device comprises a reversing device first face gear and a reversing device second face gear which are meshed with each other, a screw rod is fixed at the central position of the end face of a first shaft, the outer ring edge of a sliding ring is fixed on the end face of the reversing device first face gear, the inner ring edge of the sliding ring is in low-friction contact with the screw rod, one end of a spring sleeved on the screw rod is pressed on the end face of the reversing device first face gear, and the other end of the spring is pressed on the end face of the first shaft; the screw rod holding cavity is of a cylindrical structure, the inner cavity of the screw rod holding cavity can completely hold the screw rod, one end of the screw rod holding cavity is fixed on the end face of the second face gear of the reversing device, and the other end of the screw rod holding cavity is fixed on the end face of the third shaft.

Preferably, the support rod of the right arc-shaped rack or/and the left arc-shaped rack can be fixed on the straight rod of the non-rotating shaft part of the pedal crank, or the support rod of the right arc-shaped rack or/and the left arc-shaped rack can be removed and directly fixed on the straight rod of the non-rotating shaft part of the pedal crank.

Preferably, the right arc rack or/and the left arc rack can be replaced by a sector gear, the support rod can be fixed on a straight rod of a non-rotating shaft part of the pedal crank, or the support rod can be removed, and the sector gear can be directly fixed on the pedal crank.

Further, the first axial face gear fixed on the first shaft and the second axial face gear fixed on the second shaft, which are parallel to each other in the reference plane, are simultaneously meshed with the intermediate gear arranged between the first axial face gear and the second axial face gear, so that the transmission of two coaxial shafts with different rotation directions can be realized through planetary gear transmission, wherein the first axial face gear is replaced by a sun gear fixed on the first shaft, the second axial face gear is replaced by an inner gear ring fixed on the second shaft, and the intermediate gear is replaced by a planetary gear.

Furthermore, the first axial face gear fixed on the first shaft and the second axial face gear fixed on the second shaft, which are parallel to each other, of the reference plane of the reciprocating circumference changing device are simultaneously meshed with the intermediate gear arranged between the first axial face gear and the second axial face gear, so that the transmission of two coaxial shafts in different rotating directions can be realized through the transmission of three conical gears, wherein the first axial face gear and the second axial face gear are respectively replaced by two conical gears with parallel end faces, the end face of the third conical gear used for replacing the intermediate gear is perpendicular to the end faces of the first two conical gears, and the two phases of the three conical gears are meshed.

The invention provides a technical scheme of a reciprocating variable circular motion single-rack transmission bicycle, which comprises left and right pedals, left and right pedal cranks, a left and right pedal alternating device, pedal alternating gears and a fixed shaft, a connecting rod between the pedal cranks and racks, a single rack, a reciprocating variable circular device, a speed changing device and a reversing device, wherein the left and right pedal alternating device provides three implementation modes of left and right arc-shaped racks and supporting rods or sector gears. The reciprocating variable circumference device can convert the reciprocating motion of the rack into the circular motion, the speed changing device can realize the high-speed and low-speed switching of the circular motion, and the reversing device can realize the reversing of the bicycle without the matching action of the rack or the reciprocating variable circumference device.

The technical scheme of the invention has the following characteristics:

1. the up-and-down motion of the pedals is converted into the reciprocating motion of a single rack, and then the reciprocating motion is converted into the circular motion by a reciprocating circular device;

2. the upper and lower alternation of pedaling can be well realized through two arc racks with supporting rods or two sector face gears and a small cylindrical gear, and high transmission efficiency can also be achieved, wherein the arc rack or face gear transmission belongs to point contact transmission, and fixed transmission ratio can be ensured theoretically, so that vibration and noise are low, compared with bevel gears manufactured in pairs, face gear transmission has high interchangeability, and compared with bevel gear transmission, face gear transmission has high contact ratio, the gear tooth bearing capacity can be improved, and the transmission stability is increased;

3. the gear and the rack can be sealed, so that oil contamination is reduced, and the gear and the rack can be fully lubricated;

4. the rack and the reciprocating large gear meshed with the rack are single parts, and reciprocating motion can be efficiently and silently converted into circular motion by using a one-way bearing;

5. the two coaxial shafts are used for transmission, so that the volume and the weight of the reciprocating variable circumference device can be effectively reduced;

6. the face gear and the cylindrical gear can easily realize the conversion of different rotating directions of two coaxial shafts, wherein the adopted cylindrical gear has no axial acting force and axial error, almost has no influence on the transmission performance, can simplify the support and reduce the weight of the system (the function can be realized by using three traditional conical gears or using a planetary gear to ensure that the rotating directions of an inner gear ring and a sun gear are opposite);

7. the problems of chain dropping and chain breaking are avoided;

8. the rack is equivalent to a big fluted disc of a traditional bicycle, and the speed can be changed at any time by adjusting the moving distance of the rack, so that the function of stepless speed change can be realized;

9. in a conventional speed-changing bicycle, speed change is usually achieved by shifting a chain on gears with different diameters, and if the gears are reversed during speed change, a situation of 'chain falling' still can occur. The technical scheme of the invention has few moving parts during speed change, is easy to realize high-speed and low-speed switching, does not have the problem of chain falling, and does not have the situation that the gear engagement is not in place during speed change;

10. the technical scheme of the invention adopts the one-way bearing, does not adopt a flywheel used on a common bicycle, and does not have the 'click' sound generated by the pawl in the flywheel sliding on the gear teeth of the ratchet wheel.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings used for implementing the technical solution will be briefly introduced below, it is obvious that the drawings in the following description are only intended to illustrate some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without inventive labor. FIG. 1 is a perspective view of a single rack-driven bicycle with reciprocating to circular motion;

FIG. 2 is a perspective view of a transmission structure of a first embodiment of the left-right pedaling alternating apparatus of FIG. 1 for alternating left and right pedals up and down;

FIG. 3 is a perspective view of the transmission structure of the reciprocal circle changing device and the transmission and reversing device 11 of FIG. 1, which is a schematic view from the right side to the left side of the rear wheel of FIG. 1;

FIG. 4 is a perspective view of the transmission structure of the reciprocal circle changing device and the transmission and reversing device 11 of FIG. 1, as viewed from the left side to the right side of the rear wheel of FIG. 1;

fig. 5 is a schematic perspective assembly view of the first shaft face gear 15, the second shaft face gear 16, the intermediate gear 30, the intermediate gear fixing shaft 31, the first shaft one-way bearing 21 and the second shaft one-way bearing 22 on the first shaft 17 and the second shaft 18 in fig. 3 or 4;

fig. 6 is a perspective assembly view of the reciprocating bull gear 14 and the first and second shaft unidirectional bearings 21, 22 on the first and second shafts 17, 18 in fig. 3 or 4;

FIG. 7 is a perspective assembled view of the reversing device 20 of FIG. 4 or FIG. 5;

fig. 8 is a perspective view of a second embodiment and a third embodiment of the left-right pedaling alternating apparatus of fig. 1 for alternating left and right pedals up and down.

In the figure, 1, a right pedal; 2. a right pedal crank; 3. a right arc rack and a support rod; 4. left pedaling; 5. a left pedal crank; 6. a left arc rack and a support rod; 7. pedaling alternate gears; 8. a pedal alternate gear fixing shaft; 9. a connecting rod between the right pedal crank and the rack; 10. a rack; 11. the reciprocating circumference changing device and the speed changing device; 12. a rear wheel; 13. a rear wheel axle; 14. a reciprocating bull gear; 15. a first axial face gear; 16. a second axial gear; 17. a first shaft; 18. a second shaft; 19. a third axis; 20. a reversing device; 21. a first shaft one-way bearing; 22. a second shaft one-way bearing; 23. a third shaft low speed gear; 24. a rear axle low speed gear; 25. a third shaft high speed change gear; 26. a rear axle high speed change gear; 27. a bidirectional face gear; 28. a shifting fork; 29. a key; 30. an intermediate gear; 31. a middle gear fixing shaft; 32. a first face gear of the reversing device; 33. a second face gear of the reversing device; 34. a slip ring; 35. a spring; 36. a screw rod; 37. a screw rod receiving cavity; 38. a reversing device shell.

The structures shown in fig. 1-8 are schematic diagrams, and the sizes and proportions of the various drawings are set only for better clarity of the structure and the transmission process, but not for the sizes and proportions of the actual structures.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in figure 1, the reciprocating variable circular motion single-rack transmission bicycle provided by the invention comprises a right pedal 1, a right pedal crank 2, a right arc-shaped rack and support rod 3, a left pedal 4, a left pedal crank 5, a left arc-shaped rack and support rod 6, a pedal alternate gear 7, a pedal alternate gear fixing shaft 8, a connecting rod 9 between the right pedal crank and the rack, a rack 10, a reciprocating variable circular motion device, a speed change device, a reversing device 11 and a rear wheel 12.

The left and right pedal alternating device comprises a right arc-shaped rack and supporting rod 3 and a left arc-shaped rack and supporting rod 6 which are parallel to each other on a reference plane, and pedal alternating gears 7 which are meshed with the right arc-shaped rack and the supporting rod simultaneously, wherein pedal alternating gear fixing shafts 8 penetrate through mounting holes of the pedal alternating gears 7 and are fixed in position.

The reciprocating circumference-changing device, the speed-changing device and the reversing device 11 comprise a reciprocating large gear 14, a first shaft face gear 15, a second shaft face gear 16, a first shaft 17, a second shaft 18, a third shaft 19, a reversing device 20, a first shaft one-way bearing 21, a second shaft one-way bearing 22, a third shaft low-speed-changing gear 23, a rear wheel shaft low-speed-changing gear 24, a third shaft high-speed-changing gear 25, a rear wheel shaft high-speed-changing gear 26, a two-way face gear 27, a shifting fork 28, a key 29, an intermediate gear 30 and an intermediate gear fixing shaft 31, wherein the reciprocating large gear 14 is a gear meshed with a rack 10 and can do reciprocating rotary motion along with the back-and-forth reciprocating motion of the rack.

As shown in fig. 2, the pedal alternate gear 7 is a cylindrical gear, the plane formed by the right arc-shaped rack and the support rod 3 is parallel to the plane formed by the left arc-shaped rack and the support rod 6, the teeth of the two arc-shaped racks are opposite, and the right pedal crank 2, the right arc-shaped rack, the support rod 3, the right pedal crank and the connecting rod 9 between the racks move up and down in a semicircular arc shape together with the right pedal 1; similarly, the left pedal crank 5, the left arc rack and the support rod 6 move up and down along with the left pedal 4 in a semicircular arc shape. The pedal alternate gear fixing shaft 8 can enable the pedal alternate gear 7 to reciprocate clockwise or anticlockwise along with the up-and-down movement of the right arc-shaped rack and the support rod 3 and the semi-arc-shaped rack and the support rod 6. Specifically, when the right arc-shaped rack and support bar 3 is rotated upward about the right pedal crank 2, the pedal alternate gear 7 is rotated clockwise (as viewed from the right pedal 1 to the right pedal crank 2 in fig. 2, the clockwise or counterclockwise direction will be described below), while the left arc-shaped rack and support bar 6 is rotated downward about the left pedal crank 5; similarly, when the right arc rack and the support rod 3 rotate downwards by taking the right pedal crank 2 as an axis, the pedal alternate gear 7 rotates anticlockwise, and meanwhile, the left arc rack and the support rod 6 rotate upwards by taking the left pedal crank 5 as an axis; similarly, when the left arc rack and support bar 6 rotates upward or downward with the left pedal crank 5 as the axis, the corresponding pedal alternate gear 7 also rotates counterclockwise or clockwise, so that the right arc rack and support bar 3 rotates downward or upward with the right pedal crank 2 as the axis, thereby achieving the up-and-down alternation of pedals well, and the right pedal crank and the inter-rack connecting rod 8 can drive the rack 9 connected with the right arc rack and support bar to reciprocate forward or backward, and the moving direction of the rack 10 can also be changed backward or forward along with the change of the up-and-down moving direction of the left and right pedals.

As shown in fig. 3, 4 and 5, the first shaft 17 and the third shaft 19 may be solid shafts with the same outer diameter, and are connected by a reversing device 20; a shaft neck is processed at the mounting position of a first shaft one-way bearing 21 on a first shaft 17, the shaft neck and the first shaft 17 are coaxial, the outer diameter of the shaft neck is the same as the outer diameter of the cylindrical wall of a second shaft 18, the width of the shaft neck is larger than that of the first shaft one-way bearing 21, the shaft neck and the second shaft 18 are kept away from a non-contact surface, the shaft neck can enable the first shaft one-way bearing 21 and the second shaft one-way bearing 22 to select the same bearing model, and can avoid the difference in the aspects of transmission torque, rotation angle and the like in the reciprocating rotation process of a reciprocating large gear 14.

The second shaft 18 is a cylindrical hollow shaft and has a length shorter than that of the first shaft 17, the inner diameter of the second shaft is larger than the outer diameter of the first shaft 17, the second shaft 18 can freely rotate on the first shaft 17 (a rolling bearing can be mounted between the first shaft and the second shaft, and is not shown in the figure), and the first shaft 17 and the second shaft 18 are coaxial.

The bearing inner ring of the first shaft one-way bearing 21 is fixed on the journal of the first shaft 17, and the bearing outer ring is fixed on the inner wall of the mounting hole of the reciprocating large gear 14; the inner ring of the second shaft one-way bearing 22 is fixed on the second shaft 18, the outer ring of the bearing is fixed on the inner wall of the mounting hole of the reciprocating big gear wheel 14, the two outer rings of the bearing are fixed on the inner wall of the mounting hole of the reciprocating big gear wheel 14, and the parts of the two one-way bearings except the outer ring, such as the inner ring, the rolling body, the retainer and the like, and the journal of the second shaft 18 and the first shaft one-way bearing 21 which are fixed with the inner ring, should keep a certain distance without contact surface, and the distance is mainly influenced by the depth of the mounting hole of the reciprocating big gear wheel 14 and the respective width of the two one-way bearings.

When the first shaft one-way bearing 21 and the second shaft one-way bearing 22 are installed, the two one-way bearings are ensured to rotate in opposite directions, when viewed from the right side to the left side of fig. 5, the outer ring of the first shaft one-way bearing 21 can only rotate counterclockwise if rotating alone, and the outer ring of the second shaft one-way bearing 22 can only rotate clockwise if rotating alone.

The first axial gear 15 and the second axial gear 16 are fixed on the first shaft 17 and the second shaft 18 respectively, the reference planes of the first shaft 17 and the second shaft 18 are parallel to each other, the first axial gear 15 and the second axial gear 16 are meshed with the intermediate gear 30 arranged between the first axial gear and the second axial gear, the intermediate gear fixing shaft 31 penetrates through the mounting hole of the intermediate gear 30 and is fixed in position, and the intermediate gear 30 can rotate freely.

The third shaft low-speed gear 23, the bidirectional face gear 27, the key 29 and the third shaft high-speed gear 25 are sequentially arranged on the third shaft 19, the reversing device 20 connects the first shaft 17 with the third shaft 19, the rear wheel shaft low-speed gear 24 and the rear wheel shaft high-speed gear 26 are fixed on the rear wheel shaft 13, wherein two side faces of the bidirectional face gear 27 are face gears, the middle of the two face gears is a smooth groove, a sliding ball of a shifting fork 28 is arranged in the middle groove of the bidirectional face gear 27, the third shaft low-speed gear 23 is meshed with the rear wheel shaft low-speed gear 24, the third shaft high-speed gear 25 is meshed with the rear wheel shaft high-speed gear 26, and the shifting fork 28 can enable the bidirectional face gear 27 to freely slide along the key 29 on the third shaft 19.

The bidirectional face gear 27 is meshed with a face gear on the side surface of the third shaft low-speed gear 23, so that the rotating speed of the rear wheel shaft 13 is low; the bidirectional face gear 27 is engaged with a face gear on the side of the third-shaft high-speed transmission gear 25, and the rotation speed of the rear wheel shaft 13 is high.

The speed change scheme schematic diagram of the invention only provides two groups of speed change combinations of high speed and low speed, a plurality of groups of high-speed and low-speed combinations can be arranged in practical application, the rack is equivalent to a big fluted disc of a traditional bicycle, the speed can be changed at any time by adjusting the moving distance of the rack, and the function of stepless speed change can be realized.

As can be seen clearly in fig. 6, on the first shaft 17 there is a journal which is the place where the one-way bearing 21 of the first shaft is fixed.

The inner ring of the first shaft one-way bearing 21 is fixed on the shaft neck of the first shaft 17, and the outer ring thereof is fixed on the inner wall of the mounting hole of the reciprocating large gear 14. The inner ring of the second shaft one-way bearing 22 is fixed on the second shaft 18, and the outer ring thereof is also fixed on the inner wall of the mounting hole of the reciprocating large gear 14.

According to the view of the front view 6, the outer ring of the first shaft one-way bearing 21 can only rotate counterclockwise if rotating alone, and the outer ring and the inner ring of the first shaft one-way bearing 21 can be locked if rotating clockwise, that is, when the reciprocating large gear 14 rotates clockwise, the outer ring and the inner ring of the first shaft one-way bearing 21 rotate clockwise together, so as to drive the first shaft 17 to rotate clockwise; if the reciprocating large gear 14 rotates counterclockwise, the outer ring of the first shaft one-way bearing 21 alone rotates counterclockwise, and the inner ring thereof does not rotate counterclockwise.

Still according to the view of the front view 6, if the outer ring of the second one-way bearing 22 rotates alone, it can only rotate clockwise, if it rotates counterclockwise, the outer ring and the inner ring of the second one-way bearing 22 will be locked, that is, if the reciprocating large gear 14 rotates clockwise, the outer ring of the second one-way bearing 22 will rotate alone clockwise, and the inner ring will not rotate clockwise; if the reciprocating bull gear 14 rotates counterclockwise, the outer race of the second one-way bearing 22 will rotate counterclockwise together with the inner race, thereby rotating the second shaft 18 counterclockwise.

The process of the reciprocating circular motion is analyzed in detail in accordance with fig. 4 and with reference to fig. 5 and 6, and it is assumed that fig. 4 and 5 are from the right side to the left side of the figure, and fig. 6 is from the front view, that is, fig. 4 is from the rear wheel 12 to the first axial face gear 15, fig. 5 is from the first axial one-way bearing 21 to the first axial face gear 15, and fig. 6 is from the first axial one-way bearing 21 to the reciprocating large gear 14 and the second axial one-way bearing 22:

1. if the reciprocating large gear 14 rotates counterclockwise → the second shaft one-way bearing 22 is locked (i.e. the outer ring and the inner ring rotate in the same direction), the first shaft one-way bearing 21 is in a one-way state (i.e. the bearing inner ring and the outer ring are unlocked, the outer ring rotates counterclockwise) → the second shaft 18 rotates counterclockwise → the second shaft gear 16 rotates counterclockwise → the intermediate gear 30 rotates the first shaft gear 15 clockwise → the first shaft 17 rotates clockwise → the first shaft one-way bearing 21 rotates the inner ring clockwise;

2. if the reciprocating large gear 14 rotates clockwise → the first shaft one-way bearing 21 is locked (i.e. the outer ring and the inner ring rotate in the same direction), the second shaft one-way bearing 22 is in a one-way state (i.e. the bearing inner ring and the outer ring are unlocked, the outer ring rotates clockwise) → the first shaft 17 rotates clockwise → the first shaft gear 15 rotates clockwise → the intermediate gear 30 rotates the second shaft gear 16 counterclockwise → the second shaft 18 rotates counterclockwise → the second shaft one-way bearing 22 rotates the bearing inner ring counterclockwise;

from the above analysis, no matter how the rack 10 reciprocates, the reciprocating large gear 14 will rotate either counterclockwise or clockwise with the rack 10, but the first shaft 17 will always rotate clockwise, and the second shaft 18 will always rotate counterclockwise, and correspondingly, the first face gear 15 will always rotate clockwise, and the second face gear 16 will always rotate counterclockwise.

As shown in fig. 7, the reversing device 20 is composed of a reversing device first face gear 32, a reversing device second face gear 33, a sliding ring 34, a spring 35, a screw rod 36, a screw rod accommodating chamber 37, and a reversing device housing 38, wherein the reversing device first face gear 32, the reversing device second face gear 33, the sliding ring 34, the spring 35, the screw rod 36, and the screw rod accommodating chamber 37 are all enclosed by the reversing device housing 38. The reversing device 20 connects the first shaft 17 and the third shaft 19 together. Wherein the screw rod 36 is fixed at the center position of the right end face of the first shaft 17; the outer ring edge of the sliding ring 34 is fixed with the end face of the reversing device first face gear 32, the inner ring edge of the sliding ring 34 is in low-friction contact with the screw rod 36, the right end of the spring 35 is pressed on the end face of the reversing device first face gear 32, and the left end of the spring 35 is pressed on the right end face of the first shaft 17; the screw receiving chamber 37 is of a cylindrical configuration and is adapted to receive the screw 36 completely within its interior, with its left end secured to the end face of the reversing device second face gear 33 and its right end secured to the left end face of the third shaft 19.

During assembly, the first face gear 32 of the reversing device is engaged with the second face gear 33 of the reversing device, and the first face gear 32 of the reversing device is pressed on the second face gear 33 of the reversing device by the spring 35 (a certain space for moving left is reserved for the first face gear 32 of the reversing device).

Fig. 7 can be analyzed in conjunction with fig. 4 and 5, and the view angle of fig. 7 is the same as that of fig. 4 and 5, when the first shaft 17 rotates clockwise, the screw rod 36 rotates clockwise to push the sliding ring 34 to move rightward, and the reverse device first face gear 32 fixed with the sliding ring 34 is pressed on the reverse device second face gear 33 more tightly. Since the first axle 17 can only rotate clockwise, the rear wheels 12 rotate counterclockwise (as viewed from the right to the left in fig. 4) during normal driving. During reversing, the rear wheel 12 rotates clockwise, the rear wheel shaft 13 also rotates clockwise, after transmission of the speed change gear combination, the third shaft 19 rotates counterclockwise to drive the reversing device second face gear 33 to rotate counterclockwise, the reversing device first face gear 32 meshed with the reversing device second face gear rotates counterclockwise, the first shaft 17 can only rotate clockwise at the moment, the rotating action at the moment is started from the clockwise rotation of the rear wheel 12, the rack 10 does not reciprocate, the first shaft 17 does not rotate at the moment, the screw rod 36 does not rotate, the sliding ring 34 moves leftwards under the action of the counterclockwise rotation of the reversing device first face gear 32 and returns to the original position under the elastic force of the spring 35, during the process, the reversing device second face gear 33 rotates counterclockwise continuously, and the reversing device first face gear 32 meshed with the reversing device first face gear 32 moves leftwards repeatedly continuously, And then by the action of rebounding back by the spring 35, the gear teeth of the second face gear 33 of the reversing device continuously slide on the gear teeth of the first face gear 32 of the reversing device, and then the second face gear 33 of the reversing device continuously rotates on the right side of the first face gear 32 of the reversing device, so that the reversing is continuously realized.

In fig. 8, a second and a third embodiments of the left and right foot pedal alternation device for realizing the up and down alternation of the left and right foot pedals are provided, which can be used as an alternative to the right arc-shaped rack and support rod 3 or/and the left arc-shaped rack and support rod 6 in fig. 1 or fig. 2, wherein the left embodiment in fig. 8 is the second embodiment, the right arc-shaped rack and support rod 3 or/and the left arc-shaped rack and support rod 6 can be fixed on the straight rod of the non-rotating shaft part of the foot crank, for example, the support rod is installed on the straight rod of the right foot crank 2 in the left figure to fix the right arc-shaped rack 3, or the support rod can be directly removed, for example, the left arc-shaped rack 6 in the left figure is directly fixed on the straight rod of the non-rotating shaft part of the foot crank, that is, on the straight rod of the left foot crank 5.

The scheme of the right drawing in fig. 8 is a third embodiment, and the arc-shaped rack is replaced by a sector gear, as shown in the right drawing in fig. 8, the arc-shaped racks on the left side and the right side are replaced by sector gears, the sector gears can be fixed by a support rod arranged on a straight rod of the right pedal crank 2 and a fixing ring arranged on a rotating shaft of the right pedal crank 2, or the sector gears can be directly fixed on the straight rod and the rotating shaft of the left pedal crank 5, and the support rod is removed.

In addition, the first axial face gear 15, the second axial face gear 16, the intermediate gear 30 and the intermediate gear fixing shaft 31 shown in fig. 3, 4 and 5 can realize the transmission of two coaxial shafts with different rotation directions, and this scheme can also realize the function by using the conventional three conical gears or planetary gears and other alternatives, wherein in the planetary gear alternative, the first axial face gear 15, the second axial face gear 16 and the intermediate gear 30 respectively correspond to a sun gear, an inner gear ring and a planetary gear, namely, the first axial face gear 15 is replaced by a sun gear fixed on the first shaft 17, the second axial face gear 16 is replaced by an inner gear ring fixed on the second shaft 18, and the intermediate gear 30 is replaced by a planetary gear; in the alternative of three conical gears, two of the three conical gears have their end faces parallel to each other, i.e. the first axial gear 15 and the second axial gear 16 correspond to two conical gears with parallel end faces respectively, the third conical gear corresponds to the intermediate gear 30, the end faces thereof are perpendicular to the end faces of the first two conical gears, and the two conical gears of the three conical gears are engaged with each other. Since these two alternatives belong to a common assembly mode, they are not described in detail in the drawings.

Although the present invention has been described in terms of its structural functions and operations with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise arrangements and functions and operations described above, and that the foregoing embodiments are merely illustrative and not restrictive, since various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.