CN110341875A - Chainless driving speed-changing bicycle - Google Patents

Abstract

The invention discloses a chainless driving speed-changing bicycle. The front tube type bicycle is characterized by comprising a front tube, wherein the upper end of the front tube is rotatably connected with a handle, the lower end of the front tube is rotatably connected with a front fork, and the lower end of the front fork is connected with a front wheel in a rolling manner. The device of the invention replaces a conventional chain to transmit power by arranging the transmission arm, the upper arc-shaped rack, the lower arc-shaped rack, the arc-shaped rack and the first speed changing slide block, ensures that wheels can always keep rotating in one direction when the racks move back and forth alternatively without reversing the rotating direction of the output shaft by arranging 2 unidirectional ball gears which are arranged in the positive and negative directions, and can act on the rear wheel when feet act on the pedals up and down by arranging the upper arc-shaped rack and the lower arc-shaped rack simultaneously left and right so as to drive the wheels to run.

Description

A chainless drive variable speed bicycle

The invention relates to the technical field of bicycles, in particular to a chainless drive variable speed bicycle.

Background technique

Bicycles, also known as bicycles or bicycles, are usually small land vehicles with two wheels; after people ride on the bicycle, they use pedals as power, which is a green and environmentally friendly means of transportation, and can be used as an environmentally friendly means of transportation for transportation and travel; More and more people use bicycles as fitness equipment for exercising and cycling; cycling itself is also a competitive sport, including road cycling, mountain biking, track cycling, stunt cycling, etc.;

The current common bicycle transmission methods are: chain drive, shaft drive and belt drive. Compared with other transmission methods, chain transmission is the most widely used. Its structure is simple and light, easy to maintain, and the transmission is stable, but it often encounters embarrassing situations where the chain is dropped. The shaft-driven bicycle uses the transmission shaft for power transmission, so there will be no chain drop. However, the processing of transmission shafts requires high precision and high cost, and the profit of bicycles is low. General bicycle companies cannot produce transmission shafts with reliable quality. The final belt drive is sensitive to temperature changes, weak against environmental factors, expensive, and requires a special frame for installation and use. The chain drive bicycle uses the front and rear derailleurs to drive the chain to combine on the corresponding sprocket to obtain the corresponding transmission ratio. Of course, there is also a bicycle with a central shaft gearbox, which uses gear combination to change speed, but the corresponding price is relatively expensive; lack of a better , simpler bicycle transmission and speed change device.

Contents of the invention

The main purpose of the present invention is to provide a chainless drive variable speed bicycle, which can effectively solve the problems in the background technology.

In order to achieve the above object, the technical scheme that the present invention takes is:

A chainless drive variable speed bicycle, comprising a front tube, the upper end of the front tube is rotatably connected with a handle, the lower end of the front tube is rotatably connected with a front fork, the lower end of the front fork is rollingly connected with a front wheel, the One side of the front tube is fixedly connected with an upper tube body and a lower tube body, one end of the upper tube body is fixedly connected with a seat tube, the upper end of the seat tube is screwed with a seat cushion, and one side of the middle part of the seat tube is fixed A rear seat stay is connected, the lower side of the seat tube is fixedly connected with a rear chain stay, the lower side of the seat tube is rotatably connected with a first center shaft, and one end of the first center shaft is provided with a first crank, so One side of the first crank is fixedly connected with a slider, one side of the slider is rotatably connected with a second crank, and the lower end of the second crank is rotatably connected with a pedal, and one side of the chainstay is passed through the first The two central shafts are rotatably connected with a swing arm, one side of the swing arm is provided with a guide groove, the other side of the swing arm is provided with a shift gear and a second traction line, and one side of the swing arm passes through a shift slide There is a second speed change slider slidingly connected to it, and a first positioning roller is arranged at one end of the speed change gear, and one end of the second speed change slider is fixedly connected with a movable shaft through a force transmission connecting rod, and one side of the movable shaft A driving fork is slidably connected, one end of the driving fork is fixedly connected with a third central axis, the inner side of the driving fork is slidably connected with a first speed change slider, and the inner side of the driving fork is provided with a return spring and The first traction line, the outer side of the driving pendulum is rollingly connected with the second positioning roller, one side of the first speed change slider is fixedly connected with the force transmission arm, and one end of the force transmission arm passes through the upper arc rack The arc-shaped rack is fixedly connected with the lower arc-shaped rack, the upper arc-shaped rack and the lower arc-shaped rack are rotatably connected with a rolling bearing, and the rolling bearing is rotatably connected with a one-way ball gear through a roller shaft. The inner arm of the ball gear is provided with an inner ratchet and a pawl, and the middle part of the one-way ball gear is connected with a rear wheel through the rotation of the rear axle.

Further, the first central axis, the first crank, the second crank pedal and the slider jointly form a driving assembly, and the two first cranks are 180 degrees from each other, and are connected to each other through the first central axis. The two second cranks are respectively connected to the first crank through sliders, and the angle between the second crank and the first crank is 130 degrees. The shaft center is vertical to the horizontal plane, and when the other foot acts on the pedal, the angle between the two second cranks is 130 degrees. Form the maximum arm, which is the most effort-saving state.

Further, the swing arm is symmetrically fixed on both sides of the chainstay through the second central axis and can swing, and the rotation of the slider drives the guide groove through the rotation of the second crank to make the swing arm alternately swing up and down along the second central axis .

Further, the force transmission link is located between the swing arm and the drive swing link, and guides the swing of the swing arm to swing on the drive swing link.

Further, the driving swing rod is fixed on both sides of the chainstay through the third center shaft and can swing, and both sides of the driving swing rod are provided with sawtooth teeth, which are adjusted by changing the position of the second positioning roller. The position of the first variable speed slider, and the connection of the first traction line is pulled by the return spring to realize the variable speed reset function.

Further, the transmission arm, the upper arc rack, the lower arc rack, the arc rack and the first speed change slider form a transmission assembly, and the upper arc rack is connected with a positively placed one-way The ball gears are meshed, and the lower arc-shaped rack is meshed with a reversely placed one-way ball gear, and the periodic movement of the rack drives the one-way ball gears to rotate respectively, thereby driving the wheels to rotate.

Further, the one-way ball gear is composed of an inner ratchet, a pawl, a rolling bearing and a roller, and the rolling bearing allows the one-way acting one-way ball gear to only allow rotation in one direction, and a pair of front wheels are installed on the left and right sides of the rear wheel. One-way ball gears placed in opposite directions, two on each side.

Further, the second speed change slider moves along the speed change slideway, so that the meshing of the first positioning roller with different speed change gears can change the length of the power arm and the resistance arm to change the length of one working cycle of the arc-shaped rack. Furthermore, the number of teeth meshed with the one-way ball gear at different speeds is realized to change the transmission ratio, and the front speed changer is connected with the speed change finger through the second traction line to realize the speed change adjustment function.

Compared with the prior art, the present invention has the following beneficial effects:

1. The inventive device replaces the conventional chain to transmit power by setting the force transmission arm, the upper arc rack, the lower arc rack, the arc rack and the first speed change slider, and the two sets of racks that are not in the same horizontal plane and the The one-way ball gear meshes to realize the power to drive the vehicle forward;

2. The inventive device realizes the variable speed adjustment function by setting the connection between the traction line and the variable speed finger dial, so that the position of the swing arm and the driving swing rod changes. When the rack moves in a long stroke, the flywheel rotates quickly, and when it moves in a short stroke, it causes a slow speed; change The position of the second shift slider and the first shift slider in the shift slideway and the driving swing link causes the rack to change the length of the back and forth movement during one cycle, and thus change the transmission ratio;

3. The inventive device adopts two one-way ball gears placed in forward and reverse directions, so that the rack can ensure that the wheels always keep rotating in one direction when they alternately move back and forth without reversing the rotation direction of the output shaft. Placing the upper and lower piles of arc-shaped racks on the left and right at the same time can make the feet act on the rear wheels when they act on the pedals up and down, and then drive the wheels. The advantage of this is that when the one-way ball gears on the left and right sides are stressed, one side Pulling and pushing at the same time can obtain high moving efficiency and achieve labor-saving effect;

4. Compared with conventional bicycles, the inventive device is novel in speed change, simple in structure, with multiple speed ratios, labor-saving in riding, hard to damage parts, and high energy transfer efficiency.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the present invention.

Fig. 2 is a structural schematic diagram of the transmission part of the present invention.

Fig. 3 is a structural schematic diagram of the second crank of the present invention.

Fig. 4 is a schematic diagram of the structure of the swing arm of the present invention.

Fig. 5 is a schematic diagram of the structure of the driving pendulum in the present invention.

Fig. 6 is a schematic diagram of the rack structure of the present invention.

Fig. 7 is a schematic diagram of the structure of the inner arm of the one-way ball gear of the present invention.

Fig. 8 is a schematic diagram of the structure of the outer arm of the one-way ball gear of the present invention.

In the figure: 1. Front tube; 2. Handle; 3. Front fork; 4. Front wheel; 5. Upper tube body; 6. Seat cushion; 7. Rear upper fork; 8. Rear wheel; 9. Curved teeth Bar; 10, lower tube body; 11, seat tube; 12, one-way ball gear; 13, rear chainstay; 14, power transmission link; 15, first center shaft; 16, first crank; 17, swing arm ; 18, the second crank; 19, pedals; 20, the second central axis; 21, the movable axis; 22, the third central axis; 23, the driving swing bar; 24, the force transmission arm; 25, the slide block; 26, Rear axle; 27, guide groove; 28, shift gear position; 29, return spring; 30, first shift slider; 31, first traction line; 32, first positioning roller; 33, second shift slider; 34 , the second traction line; 35, the variable speed slideway; 36, the upper arc rack; 37, the lower arc rack; 38, the inner ratchet; 39, the pawl; 40, the roller; 41, the rolling bearing; 42, the first Two positioning rollers;

Detailed ways

In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

As shown in Figures 1-8, a chainless drive variable speed bicycle includes a front pipe 1, the upper end of the front pipe 1 is rotatably connected with a handle 2, and the lower end of the front pipe 1 is rotatably connected with a front fork 3, so The lower end of the front fork 3 is rollingly connected with the front wheel 4, one side of the front tube 1 is fixedly connected with the upper tube body 5 and the lower tube body 10, and one end of the upper tube body 5 is fixedly connected with the seat tube 11, so The upper end of the seat tube 11 is screwed with a seat cushion 6, one side of the middle part of the seat tube 11 is fixedly connected with a rear stay 7, and the lower side of the seat tube 11 is fixedly connected with a rear chain stay 13, and the seat tube 11 is fixedly connected with a rear chainstay 13. The lower side of 11 is rotatably connected with a first central shaft 15, and one end of the first central shaft 15 is provided with a first crank 16, and one side of the first crank 16 is fixedly connected with a slider 25, and the slider 25 One side of the chainstay 13 is rotatably connected with a second crank 18, and the lower end of the second crank 18 is rotatably connected with a pedal 19, and one side of the chainstay 13 is rotatably connected with a swing arm 17 through a second center shaft 20. One side of the swing arm 17 is provided with a guide groove 27, and the other side of the swing arm 17 is provided with a shift tooth position 28 and a second traction line 34, and one side of the swing arm 17 is slidably connected to a The second shift slider 33, one end of the shift gear position 28 is provided with a first positioning roller 32, and one end of the second shift slider 33 is fixedly connected with the movable shaft 21 through the force transmission connecting rod 14, and the movable shaft One side of 21 is slidably connected with a drive pendulum 23, and one end of the drive pendulum 23 is fixedly connected with a third central axis 22, and the inner side of the drive pendulum 23 is slidably connected with a first speed change slider 30, and the drive pendulum The inner side of the rod 23 is provided with a return spring 29 and a first traction wire 31, the outer side of the driving pendulum 23 is rollingly connected with a second positioning roller 42, and one side of the first shift slider 30 is fixedly connected with a force transmission arm 24. One end of the force transmission arm 24 is fixedly connected with an arc-shaped rack 9 through an upper arc-shaped rack 36 and a lower arc-shaped rack 37, and the upper arc-shaped rack 36 and the lower arc-shaped rack 37 are rotationally connected There is a rolling bearing 41, and the rolling bearing 41 is rotatably connected with a one-way ball gear 12 through a roller shaft 40. The inner arm of the one-way ball gear 12 is provided with an inner ratchet 38 and a pawl 39, and the middle part of the one-way ball gear 12 The rear wheels 8 are rotatably connected via a rear axle 26 .

Wherein, the first central axis 15, the first crank 16, the second crank 18, the pedal 19 and the slider 25 together form a driving assembly, and the two first cranks 16 are 180 degrees to each other. The shafts 15 are connected to each other, and the two second cranks 18 are respectively connected to the first crank 16 through the slider 25, and the angle between the second crank 18 and the first crank 16 is 130 degrees, when the foot pedal 19 , when located at the upper and lower dead centers, one foot is perpendicular to the center of the central axis and the horizontal plane, and when the other foot acts on the pedal, the angle between the two second cranks 18 is 130 degrees at this time, and the sliding When the block 25 is at the highest point of the guide groove 27, it forms the maximum force arm with the second central axis 20, which is the most labor-saving state. The other side of the crank is tilted forward. At this time, the feet can continue to exert force to drive the wheels, and the crank The advantage of this arrangement is that it solves the dead point of force and improves the cranks of traditional bicycles at 180 degrees to each other. However, when the crank is located at the top and bottom dead centers, it cannot do work, and it needs to rely on inertia to step over the dead center.

Wherein, the swing arm 17 is symmetrically and fixedly installed on both sides of the chainstay 13 through the second central axis 20 and can swing, and the rotation of the slider 25 drives the guide groove 27 through the rotation of the second crank 18 so that the swing arm 17 moves along the first The two central shafts 20 alternately swing up and down to convert the rotation of the crank into a stretching motion to drive the arc-shaped rack 9 to move back and forth.

Wherein, the force transmission link 14 is located between the swing arm 17 and the drive swing link 23 , and guides the swing of the swing arm 17 to swing on the drive swing link 23 .

Wherein, the driving swing rod 23 is fixed on both sides of the chainstay 13 through the third center shaft 22 and can swing. Adjust the position of the first shifting slider 30 according to the position change, and pull the first traction wire 31 through the return spring 29 to connect to realize the shifting reset function, realize the direct movement of the driven rack, and play a role in coordinating the shifting adjustment, realizing multi-stage Variable speed, and with a reset function.

Wherein, the transmission arm 24, the upper arc-shaped rack 36, the lower arc-shaped rack 37, the arc-shaped rack 9 and the first shift slider 30 form a transmission assembly, and the upper arc-shaped rack 36 is connected with a positive The one-way ball gear 12 placed in the opposite direction meshes with the one-way ball gear 12 placed in the opposite direction, and the one-way ball gear 12 is driven to rotate by the periodic movement of the rack, thereby driving the wheel to rotate , instead of the conventional chain transmission power, two sets of racks not on the same horizontal plane mesh with the one-way ball gear 12 to realize power to drive the vehicle forward.

Wherein, the one-way ball gear 12 is composed of an inner ratchet 38, a pawl 39, a rolling bearing 41 and a roller 40. The rolling bearing 41 makes the one-way acting one-way ball gear 12 only allow one direction of rotation, and the left and right sides of the rear wheel 8 Both are equipped with a pair of one-way ball gears 12 placed in positive and negative directions, two on each side. When the one-way ball gears 12 contact with the arc-shaped rack, they can reduce friction and improve efficiency, so that the rack can be rotated without reversing the output shaft. In the case of the direction of rotation, when alternately moving back and forth, the wheels can be guaranteed to rotate in one direction all the time, and a stack of arc-shaped racks 9 can be placed on the left and right at the same time so that the feet can act on the rear wheels 8 when they act on the pedals up and down. Drive the wheels to drive, improve the gear conversion rate, save the user's power, and play a role in rapid acceleration.

Wherein, the second speed change slider 33 moves along the speed change slideway 35, so that the engagement of the first positioning roller 32 with different speed change gear positions 28 can change the length of the power arm and the resistance arm to change the arc rack 9 one working cycle. The length of the movement, and then the number of teeth meshed with the one-way ball gear 12 at different speeds to change the transmission ratio. The front speed changer is connected with the speed change dial through the second traction wire 34 to realize the speed change adjustment function, and the change of the arm is controlled by the position change of the slider and the roller, so as to realize different numbers of meshing teeth and increase the transmission ratio.

It should be noted that the present invention is a chain-free variable-speed bicycle,

Steps of use: When in use, the user straddles the seat cushion 6, steps on the pedal 19 and pushes down, so that the second crank 18 rotates to drive the slider 25 to slide on the guide groove 27, so that the swing arm 17 moves along the first The second central axis 20 swings up and down, thereby driving the driving swing rod 23 to swing through the third central axis 22 through the force transmission connecting rod 14, and at the same time, the first shift slider 30 on one side drives the force transmission arm 24 to move back and forth, and at this time, the upper arc The rack 36 and the lower arc-shaped rack 37 drive the one-way ball gear 12 to rotate through the rolling bearing 41 respectively, so that the vehicle moves forward and reciprocates continuously. The lower arc-shaped rack 37 drives the one-way ball gear 12 to rotate through another rolling bearing 41. Thereby realize reciprocating drive forward, when needing variable speed driving, stir traction line, make the second speed change slide block 33 drive the first positioning roller 32 to adjust on the speed change gear position 28, make to form different force arms, pull and drive the fork 23 inner sides The second traction line 34 of the second pulling line 34 makes the first speed change slider 30 and the second positioning roller 42 jump, changing the length of the arc rack 9 moving in one working cycle, and then realizing the number of teeth meshing with the one-way ball gear 12 at different speeds. Change the transmission ratio to achieve variable speed.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Variations and improvements are possible, which fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (8)

1. A chainless drive variable speed bicycle, comprising a front pipe (1), characterized in that: the upper end of the front pipe (1) is rotatably connected with a handle (2), and the lower end of the front pipe (1) is rotatably connected There is a front fork (3), the lower end of the front fork (3) is rollingly connected with a front wheel (4), and one side of the front pipe (1) is fixedly connected with an upper pipe body (5) and a lower pipe body (10 ), one end of the upper tube body (5) is fixedly connected with a seat tube (11), the upper end of the seat tube (11) is screwed with a seat cushion (6), and one side of the middle part of the seat tube (11) A rear upper fork (7) is fixedly connected, a rear fork (13) is fixedly connected to the lower side of the seat tube (11), and a first center shaft (15) is rotatably connected to the lower side of the seat tube (11) , one end of the first center shaft (15) is provided with a first crank (16), one side of the first crank (16) is fixedly connected with a slider (25), and one of the slider (25) The side is rotatably connected with a second crank (18), the lower end of the second crank (18) is rotatably connected with a pedal (19), and one side of the chainstay (13) is rotated through the second center shaft (20). A swing arm (17) is connected, one side of the swing arm (17) is provided with a guide groove (27), and the other side of the swing arm (17) is provided with a transmission gear position (28) and a second traction line (34), one side of the swing arm (17) is slidably connected with a second shift slider (33) through a shift slide (35), and one end of the shift gear (28) is provided with a first positioning roller ( 32), one end of the second speed change slider (33) is fixedly connected with a movable shaft (21) through a force transmission connecting rod (14), and one side of the movable shaft (21) is slidably connected with a drive pendulum (23) , one end of the drive swing link (23) is fixedly connected with the third center shaft (22), and the inner side of the drive swing link (23) is slidably connected with the first speed change slider (30), and the drive swing link ( The inner side of 23) is provided with back-moving spring (29) and first traction line (31), and the outer side of described driving pendulum (23) is rollingly connected with second positioning roller (42), and described first variable speed slide block (30 ) is fixedly connected with a force transmission arm (24), and one end of the force transmission arm (24) is fixedly connected with an arc tooth bar (37) by an upper arc tooth bar (36) and a lower arc tooth bar ( 9), the upper curved rack (36) and the lower curved rack (37) are rotatably connected with a rolling bearing (41), and the rolling bearing (41) is rotatably connected with a one-way ball gear ( 12), the inner arm of the one-way ball gear (12) is provided with an inner ratchet (38) and a pawl (39), and the middle part of the one-way ball gear (12) is rotatably connected with a rear shaft (26) wheel (8). 2. A kind of chainless drive variable speed bicycle according to claim 1, characterized in that: said first central axis (15), first crank (16), second crank (18) pedal (19) and The sliders (25) together form a drive assembly, the two first cranks (16) are mutually connected at 180 degrees through the first center shaft (15), and the two second cranks (18) pass through the The slide block (25) is connected with the first crank (16), and the angle between the second crank (18) and the first crank (16) is 130 degrees. At the same time, a pin is vertical to the horizontal plane relative to the central axis, and when the other pin acts on the pedal, the angle between the two second cranks (18) is 130 degrees, and the slide block (25 ) was at the highest point of the guide groove (27), forming the maximum arm of force with the second central axis (20), which was the most labor-saving state. 3. A chain-free variable-speed bicycle according to claim 1, characterized in that: said swing arm (17) is symmetrically fixed on both sides of the chainstay (13) through the second central axis (20) and It can swing, and the rotation of the slider (25) drives the guide groove (27) through the rotation of the second crank (18) to make the swing arm (17) alternately swing up and down along the second central axis (20). 4. A chainless drive variable speed bicycle according to claim 1, characterized in that: said force transmission link (14) is located between the swing arm (17) and the drive swing link (23), and the swing arm ( 17) is guided to swing on the drive fork (23). 5. A chainless drive variable speed bicycle according to claim 1, characterized in that: the drive swing link (23) is fixed on both sides of the chainstay (13) through the third center shaft (22) and can be Swing, both sides of the drive pendulum (23) are provided with serrated teeth, which adjust the position of the first speed change slider (30) through the position change of the second positioning roller (42), and the position of the first speed change slider (30) is adjusted by the return spring (29 ) pulling the first traction line (31) to connect to realize the variable speed reset function. 6. A chainless drive variable speed bicycle according to claim 1, characterized in that: said force transmission arm (24), upper arc rack (36), lower arc rack (37), arc The gear rack (9) and the first speed change slider (30) form a transmission assembly, the upper arc rack (36) meshes with a positively placed one-way ball gear (12), and the lower arc rack (37) meshes with a reversely placed one-way ball gear (12), and drives the one-way ball gear (12) to rotate respectively through the periodic movement of the rack, thereby driving the wheel to rotate. 7. A chain-free variable-speed bicycle according to claim 1, characterized in that: said one-way ball gear (12) is composed of an inner ratchet (38), a pawl (39), a rolling bearing (41) and a roller (40), the rolling bearing (41) makes the one-way acting one-way ball gear (12) only allow rotation in one direction, and the left and right sides of the rear wheel (8) are equipped with a pair of one-way ball gears placed in positive and negative directions (12), two on each side. 8. A chainless drive variable speed bicycle according to claim 1, characterized in that: said second variable speed slider (33) moves along the variable speed slideway (35), so that the first positioning roller (32) is different from By changing the length of the power arm and the resistance arm through the meshing of the speed change gear (28), the length of the arc rack (9) moving in one working cycle can be changed, and the number of teeth meshed with the one-way ball gear (12) at different speeds can be realized. The transmission ratio is changed, and the front speed change device is connected with the speed change finger through the second traction wire (34) to realize the speed change adjustment function.