CN212149188U

CN212149188U - Labor-saving bicycle convenient for speed regulation

Info

Publication number: CN212149188U
Application number: CN201922354473.2U
Authority: CN
Inventors: 曾东斌
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2020-12-15
Anticipated expiration: 2029-12-25

Abstract

The utility model discloses a laborsaving bicycle of convenient speed governing, including front wheel assembly, rear wheel assembly and frame, both ends, its characterized in that around the frame are installed respectively to front wheel assembly and rear wheel assembly: still including being used for turning into the four-bar linkage of pendulum power with the rider dead weight, the sprocket, chain A and drive mechanism, four-bar linkage installs on the frame, the rotatable installation of sprocket on the frame and with chain A's middle part meshing, the sprocket passes through transmission and is connected with the rear wheel assembly transmission, chain A's one end sliding connection is on four-bar linkage's output side link, the output side link extends with the link of frame has the kink, chain A's the other end and kink are connected, be equipped with the tensioning ware that is used for the tensioning of chain A between kink and the output connecting rod. The utility model discloses the speed of riding is adjusted to quick simply, is favorable to protecting the health, and the practicality is strong.

Description

Labor-saving bicycle convenient for speed regulation

Technical Field

The utility model relates to a bicycle technical field, concretely relates to laborsaving bicycle of convenient speed governing.

Background

The driving of the traditional bicycle is almost completed by the rotating motion of pedaling. As is known, when the pedals are pedaled by manpower to do circular motion, not only a fatal dead point causes a powerful reactive phenomenon, but also the driving efficiency near the dead point is extremely low, which causes great waste of limited manpower. With the diversified development of society, the bicycle is not only a walking tool, but also a body-building tool and a sports game apparatus, or an amusement toy and the like. To traditional bicycle ride hard, sit for a long time and influence healthy shortcoming, at present, have some can be laborsaving and can reach the bicycle of taking exercise the health, but the speed governing mechanism that does not have a correspondence of these bicycles, is difficult to the speed governing during riding, has increased because the speed is not adjustable for the risk of riding and bringing, when the speed of riding was too fast, threatened to rider's physical and mental health easily.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve above-mentioned technical problem and provide a laborsaving bicycle of convenient speed governing, the governing speed that can be simple quick protects rider's physical and mental health.

The utility model provides an above-mentioned technical problem's technical scheme as follows: a labor-saving bicycle convenient for speed regulation comprises a front wheel assembly, a rear wheel assembly and a frame, wherein the front wheel assembly and the rear wheel assembly are respectively arranged at the front end and the rear end of the frame, the bicycle further comprises a four-bar mechanism, a chain wheel, a chain A and a transmission mechanism, the four-bar mechanism is used for converting dead weight of a rider into swing force, the four-bar mechanism is arranged on the frame, the chain wheel is rotatably arranged on the frame and meshed with the middle part of the chain A, the chain wheel is in transmission connection with the rear wheel assembly through the transmission device, one end of the chain A is in sliding connection with an output connecting rod of the four-bar mechanism, a bent part extends from the connecting end of the output connecting rod and the frame, the other end of the chain A is connected with the bent part, and a tensioner used for tensioning the chain A is arranged between the bent part and the output connecting, the improved bicycle is characterized in that a sliding block is arranged on the output side link, the sliding block is connected with one end of the chain A, a spiral transmission mechanism used for driving the sliding block to slide along the output side link is installed on the output side link, a handle is rotated at the top of the front end of the bicycle frame and is connected with one end of a universal flexible shaft in a rotating mode, and the other end of the universal flexible shaft is connected with the sliding block in a rotating mode.

The utility model has the advantages that: the input of the four-bar mechanism is driven through gravity, the output side link of the four-bar mechanism obtains swing power, the output swing power of the output side link is obtained through the chain A and is transmitted to the transmission mechanism to drive the bicycle, and the force arm can be simply adjusted by controlling the sliding block to adjust the position of the chain A relative to the output side link, so that the torque output by the chain wheel is changed, the speed regulation is completed, and the speed regulation is simple and rapid.

On the basis of the technical scheme, the utility model discloses can also do following improvement.

Further, the four-bar mechanism comprises a pedal, a connecting rod and an output connecting rod, the middle of the pedal is rotatably mounted at the lower end of the middle of the frame, the lower end of the connecting rod is hinged with the rear end of the pedal, the upper end of the connecting rod is hinged with one end, far away from the bending part, of the output connecting rod, and one end, far away from the connecting rod, of the output connecting rod is hinged with the frame.

The beneficial effects of adopting above-mentioned further scheme are that simple structure regards the running-board as four-bar linkage's input side link, turns into four-bar linkage's drive power with rider's gravity, simple structure, convenient to use.

Furthermore, the pedal plate is a bending plate, two supporting arms of the bending plate are arranged in an included angle alpha, wherein the alpha is more than or equal to 179 degrees and less than 180 degrees.

Adopt the beneficial effect of above-mentioned further scheme to prevent the dead point, be convenient for ride.

Furthermore, a seat is fixed at the hinged end of the connecting rod and the output side link.

The beneficial effects of adopting above-mentioned further scheme are that the drive to four-bar linkage is accomplished through the rider's that seat and running-board bore gravity simultaneously, and is more laborsaving, need not long-time foot motion, need whole body action to accomplish and ride and can reach good exercise effect.

Further, a sector is fixedly arranged on the chain wheel, a flywheel A meshed with the sector is installed on the frame, and the flywheel A is in transmission connection with the rear wheel assembly through the transmission mechanism.

The beneficial effects of adopting above-mentioned further scheme are that adopt mechanical transmission, simple structure, it is reliable.

Further, the transmission mechanism comprises a flywheel B, a chain B and a flywheel C, the diameter of the flywheel B is larger than that of the flywheel A, the flywheel B and the flywheel A are coaxially and fixedly connected, the flywheel C is in transmission connection with the flywheel B through the chain B, and a central shaft of the flywheel C is connected with the rear wheel assembly.

The beneficial effect of adopting above-mentioned further scheme is that flywheel B's diameter is greater than flywheel A's diameter, improves the drive ratio, and is more laborsaving.

Furthermore, a support used for limiting downward displacement of the output side link is arranged on the lower portion of the frame, the bottom of the support is fixed on the lower portion of the frame, a cushion pad is mounted on the top of the support and located right below the middle portion of the output side link, and the support, the connecting rod and the output side link are telescopic rods.

The further scheme has the advantages that the stability is improved through the support; the swing amplitude of the output side link and the height of the seat can be adjusted, and people with different body types can use the chair.

Furthermore, the transmission mechanism further comprises a middle flywheel, a rotating shaft vertically extends from the rotating connection position of the pedal and the frame, the middle flywheel is fixedly sleeved on the rotating shaft, and the flywheel B, the middle flywheel and the flywheel C are in transmission connection through the chain B.

The further scheme has the advantages that supporting points of the chain A are increased, the structure is more reliable, and chain dropping is prevented; meanwhile, when the flywheel A rotates reversely, the chain A can be driven by the middle flywheel to complete transmission.

Further, the transmission mechanism comprises a chain C, a chain D, a flywheel E, a flywheel D, a transition flywheel and a middle chain plate, a rotating shaft vertically extends from the rotating connection position of the pedal and the frame, the transition flywheel is sleeved on the rotating shaft, the middle chain plate and the transition flywheel are coaxially arranged and fixedly connected on an outer plate body of the transition flywheel, the flywheel E is coaxially and fixedly connected with the flywheel A, the diameter of the flywheel E is larger than that of the flywheel A, the flywheel E is in transmission connection with the transition flywheel through the chain C, the middle chain plate is in transmission connection with the flywheel D through the chain D, the flywheel D is connected with the rear wheel assembly, the diameter of the flywheel E is larger than that of the middle chain plate, the diameter of the middle chain plate is larger than that of the flywheel D, and the diameter of the flywheel D is larger than that of the transition flywheel.

The transmission mechanism is divided into two chains for transmission by arranging the transition flywheel and the middle chain disc, so that the structure is more reliable; the transmission ratio is further improved, and the riding is more labor-saving.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic structural diagram of embodiment 2 of the present invention;

fig. 3 is a schematic structural diagram of embodiment 3 of the present invention;

FIG. 4 is a schematic view of the structure of the footrest;

fig. 5 is a schematic structural diagram of embodiment 4 of the present invention;

fig. 6 is a schematic structural diagram of embodiment 5 of the present invention;

fig. 7 is a schematic structural view of embodiment 6 of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. the bicycle comprises a front wheel assembly, a rear wheel assembly, a frame, 4, a chain wheel, 5, chains A, 6, an output connecting rod, 7, a bending part, 8, a tensioner, 9, a pedal, 10, a connecting rod, 11, a sliding block, 12, a seat, 13, flywheels A, 14, a gear sector, 15, flywheels B, 16, chains B, 17, flywheels C, 18, an intermediate flywheel, 19, a transition flywheel, 20, flywheels E, 21, an intermediate chain disc, 22, flywheels D, 23, chains C, 24, chains D, 25, a support, 26, a handle, 27, a screw transmission mechanism, 28 and a universal flexible shaft.

Detailed Description

The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

Example 1

As shown in figure 1, the labor-saving bicycle convenient for speed regulation comprises a front wheel assembly 1, a rear wheel assembly 2 and a frame 3, wherein the front wheel assembly 1 and the rear wheel assembly 2 are respectively arranged at the front end and the rear end of the frame 3.

Specifically, the front wheel assembly 1 and the rear wheel assembly 2 are conventional bicycle wheel structures and respectively comprise a wheel axle, spokes, a rim and a tire, wherein the tire is fixed on the rim, and the rim is fixed on the wheel axle through the spokes. The frame 3 is a tripod. The stability of triangle-shaped guarantees that bicycle overall structure is firm reliable. A handle 26 is fixed to the top of the front end of the frame 3.

Still including being used for turning into the four-bar linkage of pendulum power with the rider's dead weight, sprocket 4, chain A5 and drive mechanism, four-bar linkage installs on frame 3, sprocket 4 is rotatable installs on frame 3 and meshes with the middle part of chain A5, sprocket 4 passes through transmission and is connected with rear wheel assembly 2 transmission, the one end sliding connection of chain A5 is on four-bar linkage's output side link 6, output side link 6 extends with the link of frame 3 has kink 7, the other end and the kink 7 of chain A5 are connected, be equipped with tensioning ware 8 between kink 7 and the output connecting rod and pass through tensioning ware 8 with chain A5 tensioning. The hinged ends of the connecting rod 10 and the output side link 6 are fixed with a seat 12.

Specifically, the chain a5 is slid on the output link 6 to change the length of the chain a5, and the output arm of force of the four-bar linkage is changed, so that the input of the transmission mechanism is changed, and the speed is adjusted.

Preferably, tensioning ware 8 is the tensioning spring, and kink 7 and output side link 6 are connected respectively to the both ends of tensioning spring, guarantees through the tensioning spring that chain A5 is in the tensioning condition all the time, simple structure, easily purchases, reduction in production cost.

The four-bar mechanism comprises a pedal 9, a connecting rod 10 and an output connecting rod 6, the middle of the pedal 9 is rotatably installed at the lower end of the middle of the frame 3, the lower end of the connecting rod 10 is hinged with the rear end of the pedal 9, the upper end of the connecting rod 10 is hinged with one end, far away from the bending part 7, of the output connecting rod 6, and one end, far away from the connecting rod 10, of the output connecting rod 6 is hinged with the frame 3. The chain wheel 4 is fixedly provided with a sector 14, the frame 3 is provided with a flywheel A13 meshed with the sector 14, and the flywheel A13 is in transmission connection with the rear wheel assembly 2 through a transmission mechanism.

As shown in fig. 4, the pedal 9 is a bending plate, and two supporting arms of the bending plate are arranged at an included angle alpha, wherein alpha is more than or equal to 179 degrees and less than 180 degrees.

The cover is equipped with slider 11 on the output side link 6, slider 11 links to each other with chain A5's one end, slider 11 and output side link 6 threaded connection, through the screw drive of slider 11 and output side link 6, convert slider 11's rotation into the slip of chain A5 one end, it just enables chain A5's one end and output side link 6 to take place relative displacement to rotate slider 11, handle 26 rotates the one end that is connected with universal flexible axle 28, the other end of universal flexible axle 28 rotates linking slide 11.

Specifically, the slide block 11 is in threaded connection with the output side link 6, an annular groove is formed in the slide block 11, an annular connecting piece capable of rotating in the annular groove is arranged in the annular groove, and meanwhile, the end part of the chain A5 is connected with the annular connecting piece to drive the end part of the chain A5 to move only in the length direction of the output side link 6 so as to prevent deviation; the universal flexible shaft 28 is based on the principle of the prior art that the outer side is a jacket, the middle core part is a thin steel wire rope, and two ends of the steel wire rope are supported by bearings. When the steel wire rope is used, the steel wire rope rotates, and the outer sleeve does not rotate. In the application of a manual tool or a transmission shaft, a flexible shaft is often adopted, for example, in some specific occasions, when the bolt and the nut are disassembled and assembled, the flexible shaft is matched with a conventional tool to form a flexible screwdriver. The rotation of the slider 11 is controlled by the turning handle 26, so that the slider 11 is horizontally slid, the end of the chain a5 is moved in the longitudinal direction of the output side link 6, and the moment is adjusted.

The support 25 that is used for restricting output side link 6 downstream displacement is equipped with to frame 3 lower part, and the bottom of support 25 is fixed in frame 3 lower part, and the blotter is installed at the top of support 25, and the blotter is located output side link 6 under the middle part, and support 25, connecting rod 10 and output side link 6 are the telescopic link.

Specifically, the support 25, the connecting rod 10 and the output link lever 6 all comprise an inner rod and an outer cylinder, and one end of the inner rod is connected in the outer cylinder in a sliding mode and locked through a screw.

Further, the sliding block 11 is sleeved on the inner rod of the output side link 6 and slides along the inner rod, a limiting block is fixedly arranged at one end, far away from the outer cylinder, of the inner rod of the output side link 6, and the sliding stroke of the sliding block 11 on the inner rod of the output side link 6 is limited through the limiting block and the outer cylinder.

The chain wheel 4 is fixedly provided with a sector 14, the frame 3 is provided with a flywheel A13 meshed with the sector 14, and the flywheel A13 is in transmission connection with the rear wheel assembly 2 through a transmission mechanism.

The transmission mechanism comprises a flywheel B15, a chain B16 and a flywheel C17, the diameter of the flywheel B15 is larger than that of the flywheel C17, the diameter of the flywheel B15 is larger than that of the flywheel A13, the flywheel B15 is coaxially and fixedly connected with the flywheel A13, the flywheel C17 is in transmission connection with the flywheel B15 through the chain B16, and the central shaft of the flywheel C17 is connected with the rear wheel assembly 2.

When riding, a person sits on the seat 12, feet are placed on the pedals 9 without applying force, the seat 12 supports the weight of the whole human body through the buttocks, the whole human body naturally faces downwards, the output connecting frame rod 6 is driven to swing downwards, the pedals 9 incline upwards, the gear fan 14 rotates clockwise, the flywheel A13 rotates anticlockwise, the flywheel B15 is driven to rotate, the chain B16 rotates, the flywheel C17 drives the rear wheel assembly 2 to rotate anticlockwise, and the vehicle runs forwards; meanwhile, the connecting shaft stops transmitting with the intermediate flywheel 18, and the intermediate flywheel 18 only transmits with the chain B16. The pedal 9 is stepped downwards by the force of feet, the hip part is upward, the downward force is applied to the pedal 9 by the self weight of a human body, the connecting rod 10 is driven to move upwards, the output connecting frame rod 6 is driven to move upwards, in addition, due to the lever effect among the pedal 9, the connecting rod 10 and the seat 12, the downward force applied to the pedal 9 can be changed into a force which is multiple times at the position of the seat 12, the swinging of the output connecting frame rod 6 is more labor-saving, the output connecting frame rod 6 drives one end of a chain A5 connected with the output connecting frame rod to swing, the chain wheel 4 rotates, the gear sector 14 rotates and is meshed with the flywheel A13, the flywheel A13 rotates reversely, the middle flywheel 18 is directly driven to rotate anticlockwise by the rotating shaft while the transmission between the flywheel B15 is stopped, the chain A5 is driven by the middle flywheel 18, and the flywheel C17 and the. The above processes are repeated to complete the riding of the bicycle.

Specifically, when riding, directly just can adjust output torque's size through the relative output side chain 6's of adjusting the slider 11 position to accomplish the regulation of speed, slider 11 slides wantonly on output side chain 6, but guarantees speed control stepless speed control, adapts to rider's demand more.

Example 2

As shown in fig. 2, the difference between this embodiment and embodiment 1 is that the transmission mechanism further includes an intermediate flywheel 18, a rotating shaft extends vertically from a rotating connection between the foot board 9 and the frame 3, the intermediate flywheel 18 is fixedly sleeved on the rotating shaft, and the flywheel B15, the intermediate flywheel 18 and the flywheel C17 are in transmission connection through a chain B16.

Specifically, when riding, directly through rotating handle 26, the size of output torque just can be adjusted to the position of adjusting the slider 11 relative output side link 6 to accomplish the regulation of speed, slider 11 slides wantonly on output side link 6, but guarantees speed control stepless speed control, adapts to rider's demand more.

Example 3

As shown in fig. 3, the present embodiment is different from embodiment 1 in that the transmission mechanism includes a chain C23, a chain D24, a flywheel E20, the bicycle comprises a flywheel D22, a transition flywheel 19 and a middle chain disc 21, wherein a rotating shaft vertically extends from the rotating connection position of a pedal plate 9 and a frame 3, the transition flywheel 19 is sleeved on the rotating shaft, the middle chain disc 21 and the transition flywheel 19 are coaxially arranged and fixedly connected to an outer disc body of the transition flywheel 19, a flywheel E20 and a flywheel A13 are coaxially and fixedly connected, the diameter of the flywheel E20 is larger than that of the flywheel A13, the flywheel E20 and the transition flywheel 19 are in transmission connection through a chain C23, the middle chain disc 21 and the flywheel D22 are in transmission connection through a chain D24, the flywheel D22 is connected with a rear wheel assembly 2, the diameter of the flywheel E20 is larger than that of the middle chain disc 21, the diameter of the middle chain disc 21 is larger than that of the flywheel D22, and the diameter of the flywheel D22 is.

Specifically, the transition flywheel 19 comprises a ratchet wheel disc and an outer disc connected with pawls, the outer disc and the ratchet wheel disc complete transmission or stop transmission through the pawls, and the intermediate chain disc 21 and the transition flywheel 19 are coaxially arranged and connected with the outer disc of the transition flywheel 19. When the pedal 9 rotates clockwise and the flywheel E20 rotates counterclockwise, the rotating shaft drives the ratchet disc to rotate clockwise, there is no transmission relationship between the ratchet disc and the outer disc, and the outer disc is driven by the chain C23 to rotate counterclockwise so as to drive the middle chain disc 21 to rotate counterclockwise, thereby ensuring that the rear wheel assembly 2 can move forward.

When riding, a person sits on the seat 12, feet are placed on the pedals 9 without applying force, the seat 12 supports the weight of the whole human body through the buttocks, the whole human body naturally faces downwards, the output link rod 6 is driven to swing downwards, the pedals 9 incline upwards, the chain A5 moves along with the output link rod 6, the chain wheel 4 is driven to rotate clockwise, the sector 14 rotates clockwise, the flywheel A13 rotates anticlockwise, the flywheel E20 is driven to rotate, the chain C23 rotates, the transition flywheel 19 drives the middle chain disc 21 to rotate, and the chain D24 rotates, so that the rear wheel assembly 2 is driven to rotate anticlockwise, and the vehicle runs forwards; at the same time, the connecting shaft stops transmitting with the intermediate flywheel 18, and the intermediate flywheel 18 only transmits with the chain C23. The pedal 9 is stepped downwards by the force of feet, the hip part is upward, the downward force is applied to the pedal 9 by the self weight of a human body, the connecting rod 10 is driven to move upwards, the output connecting frame rod 6 is driven to move upwards, in addition, due to the lever action among the pedal 9, the connecting rod 10 and the seat 12, the downward force applied to the pedal 9 can be changed into a force which is multiple times at the position of the seat 12, the output connecting frame rod 6 is driven to swing more labor-saving, the flywheel A13 rotates reversely, the transmission is stopped among the flywheel E20, the transition flywheel 19 is directly driven to rotate anticlockwise by the rotating shaft, the middle chain disc 21 is driven to rotate by the transition flywheel 19, and therefore the flywheel D22 and the rear wheel assembly 2 are driven to rotate anticlockwise through the chain D24 and the. The above processes are repeated to complete the riding of the bicycle.

Specifically, in the embodiment 1-3, during riding, the handle 26 is directly rotated to drive the slider 11 to rotate, the slider 11 and the inner rod form sliding screw transmission, and one end of the driving chain a5 slides along with the sliding screw transmission, that is, the output torque can be adjusted by adjusting the position of the slider 11 relative to the output link lever 6, so that the speed adjustment is completed, the slider 11 can slide on the output link lever 6 at will, the stepless speed adjustment of the speed adjustment is ensured, and the requirement of a rider is met.

Example 4

As shown in fig. 5, the present embodiment is different from embodiment 1 in that a slider 11 is sleeved on the output side link 6, the slider 11 is connected with one end of a chain a5, and a transmission mechanism for driving the slider 11 to slide along the output side link 6 is installed on the output side link 6.

Specifically, the transmission mechanism comprises a screw-nut pair and a limiting frame, the screw is in threaded connection with the nut, two ends of the screw respectively extend out of two sides of the limiting frame, the limiting frame is fixed on the output connecting frame rod 6, the nut is located in the limiting frame, and the nut can only rotate by limiting the position of the nut through the limiting frame. The screw rod is driven to move by rotating the nut, one end of the screw rod is fixedly connected with the sliding block, and the sliding block is driven to slide along the output side link 6.

Furthermore, the limiting frame comprises two limiting baffles which are arranged in parallel, through holes for the screw rods to pass through are formed in the limiting baffles, one ends of the two limiting baffles are fixed on the outer barrel of the output connecting frame rod 6, and the nuts are located between the two limiting baffles.

Example 5

As shown in fig. 6, the present embodiment is different from embodiment 2 in that a slider 11 is sleeved on the output side link 6, the slider 11 is connected with one end of a chain a5, and a transmission mechanism for driving the slider 11 to slide along the output side link 6 is installed on the output side link 6.

Specifically, the transmission mechanism comprises a screw-nut pair and a limiting frame, the screw is in threaded connection with the nut, two ends of the screw respectively extend out of two sides of the limiting frame, the limiting frame is fixed on the output connecting frame rod 6, the nut is located in the limiting frame, and the nut can only rotate by limiting the position of the nut through the limiting frame. The screw rod is driven to move by rotating the nut, one end of the screw rod is fixedly connected with the sliding block 11, and the sliding block 11 is driven to slide along the output side link 6.

Example 6

As shown in fig. 7, the present embodiment is different from embodiment 3 in that a slider 11 is sleeved on the output side link 6, the slider 11 is connected with one end of a chain a5, and a transmission mechanism for driving the slider 11 to slide along the output side link 6 is installed on the output side link 6.

Specifically, in the embodiment 4-6, when riding, the screw rod directly adjusts the nut rotation in the screw-nut pair, and the screw rod converts the nut rotation into linear movement, so as to drive the sliding block 11 to slide along the output side link 6. Chain a5 is tensioned by the tensioner and changes in length. Therefore, the size of the output force arm is adjusted, the transmission ratio is changed, the speed is adjusted, the sliding block 11 can slide on the output connecting frame rod 6 at will, the stepless speed regulation of the speed adjustment is guaranteed, and the requirement of a rider is met.

In all the embodiments above, the flywheel of the present invention can be the flywheel C recorded in the exercise bicycle with the application number CN201620691351.6 and the name of the flywheel C being capable of moving forward by forward rotation and reverse rotation of pedals.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. The utility model provides a laborsaving bicycle of convenient speed governing, includes front wheel assembly (1), rear wheel assembly (2) and frame (3), front wheel assembly (1) with rear wheel assembly (2) are installed respectively both ends, its characterized in that around frame (3): the bicycle is characterized by further comprising a four-bar linkage mechanism, a chain wheel (4), a chain A (5) and a transmission mechanism, wherein the four-bar linkage mechanism is used for converting dead weight of a rider into swing power, the four-bar linkage mechanism is installed on the frame (3), the chain wheel (4) is rotatably installed on the frame (3) and meshed with the middle of the chain A (5), the chain wheel (4) is in transmission connection with the rear wheel assembly (2) through a transmission device, one end of the chain A (5) is connected with an output connecting frame rod (6) of the four-bar linkage mechanism, a bent part (7) extends from the connecting end of the output connecting frame rod (6) and the frame (3), the other end of the chain A (5) is connected with the bent part (7), and a tensioner (8) used for tensioning the chain A (5) is arranged between the bent part (7) and the output connecting frame rod (6), be equipped with slider (11) on output side link (6), slider (11) with the one end of chain A (5) links to each other, install on output side link (6) and be used for the drive slider (11) are followed gliding screw drive mechanism (27) of output side link (6), the top fixedly connected with handle (26) of frame (3) front end, handle (26) rotate the one end that is connected with universal flexible axle (28), the other end of universal flexible axle (28) rotates and connects slider (11).

2. The labor-saving bicycle convenient for speed regulation as claimed in claim 1, wherein: the four-bar mechanism comprises a pedal (9), a connecting rod (10) and an output connecting rod (6), the middle of the pedal (9) is rotatably installed at the lower end of the middle of the frame (3), the lower end of the connecting rod (10) is hinged to the rear end of the pedal (9), the upper end of the connecting rod (10) is hinged to one end, away from the bending part (7), of the output connecting rod (6), and one end, away from the connecting rod (10), of the output connecting rod (6) is hinged to the frame (3).

3. The labor-saving bicycle convenient for speed regulation as claimed in claim 2, wherein: the pedal (9) is a bending plate, two supporting arms of the bending plate are arranged in an included angle alpha, wherein the alpha is more than or equal to 179 degrees and less than 180 degrees.

4. The labor-saving bicycle convenient for speed regulation as claimed in claim 3, wherein: a seat (12) is fixed at the hinged end of the connecting rod (10) and the output side link (6).

5. The labor-saving bicycle convenient for speed regulation as claimed in claim 4, wherein: the chain wheel (4) is fixedly provided with a sector (14), the frame (3) is provided with a flywheel A (13) meshed with the sector (14), and the flywheel A (13) is in transmission connection with the rear wheel assembly (2) through the transmission mechanism.

6. The labor-saving bicycle convenient for speed regulation as claimed in claim 5, wherein: the frame (3) lower part is equipped with support (25) that are used for restricting output side link (6) and move down, the bottom of support (25) is fixed frame (3) lower part, the blotter is installed at the top of support (25), the blotter is located under output side link (6) middle part, support (25), connecting rod (10) and output side link (6) are the telescopic link.

7. The labor-saving bicycle convenient for speed regulation as claimed in claim 6, wherein: the transmission mechanism comprises a flywheel B (15), a chain B (16) and a flywheel C (17), the diameter of the flywheel B (15) is larger than that of the flywheel A (13), the flywheel B (15) is coaxially and fixedly connected with the flywheel A (13), the flywheel C (17) is connected with the flywheel B (15) in a transmission mode through the chain B (16), and a central shaft of the flywheel C (17) is connected with the rear wheel assembly (2).

8. The labor-saving bicycle convenient for speed regulation as claimed in claim 7, wherein: the transmission mechanism further comprises a middle flywheel (18), a rotating shaft vertically extends from the rotating connection position of the pedal (9) and the frame (3), the middle flywheel (18) is fixedly sleeved on the rotating shaft, and the flywheel B (15), the middle flywheel (18) and the flywheel C (17) are in transmission connection through the chain B (16).

9. The labor-saving bicycle convenient for speed regulation as claimed in claim 8, wherein: the transmission mechanism comprises a chain C (23), a chain D (24), a flywheel E (20), a flywheel D (22), a transition flywheel (19) and a middle chain plate (21), a rotating shaft vertically extends from the rotating connection position of the pedal plate (9) and the frame (3), the transition flywheel (19) is sleeved on the rotating shaft, the middle chain plate (21) and the transition flywheel (19) are coaxially arranged and fixedly connected to an outer plate body of the transition flywheel (19), the flywheel E (20) and the flywheel A (13) are coaxially and fixedly connected, the diameter of the flywheel E (20) is larger than that of the flywheel A (13), the flywheel E (20) and the transition flywheel (19) are in transmission connection through the chain C (23), and the middle chain plate (21) and the flywheel D (22) are in transmission connection through the chain D (24), the flywheel D (22) is connected with the rear wheel assembly (2), the diameter of the flywheel E (20) is larger than that of the middle chain plate (21), the diameter of the middle chain plate (21) is larger than that of the flywheel D (22), and the diameter of the flywheel D (22) is larger than that of the transition flywheel (19).