WO2023098562A1

WO2023098562A1 - Pedal bicycle

Info

Publication number: WO2023098562A1
Application number: PCT/CN2022/134031
Authority: WO
Inventors: 郑健; 黑京京; 刘晓燕; 李小超
Original assignee: 西安双驱自正智能科技有限公司
Priority date: 2021-12-01
Filing date: 2022-11-24
Publication date: 2023-06-08
Also published as: CN113928465A

Abstract

A pedal bicycle, comprising: a frame (1), and a human-powered variable speed drive device, steering devices (7), front wheels (101), and a rear wheel (102) which are mounted on the frame (1). The human-powered variable speed drive device comprises: a rack, force applying arms (2), a driving force shaft (3), one-way overrunning clutches (4), a reset device (6) and a variable-speed gear set (8). One end of each force applying arm (2) is fixed to an input end of a one-way overrunning clutch (4), and output ends of the one-way overrunning clutches (4) are fixed to the driving force shaft (3). The force applying arms (2) rotate about the driving force shaft (3) back and forth along a circular arc to do work, and drive moment arms corresponding to the force applying arms (2) directly drive the input ends of the one-way overrunning clutches (4) to rotate forwards and backwards, thus intermittently driving the output ends of the one-way overrunning clutches (4) to rotate unidirectionally. As an angular velocity acceleration gear set, the variable-speed gear set (8) comprises an input end gear (81), an intermediate variable-speed gear set (82) and an end gear (83) which are in transmission connection in sequence.

Description

a pedal bicycle

technical field

The invention relates to the field of transportation tools, in particular to a pedal bicycle.

Background technique

The power conversion transmission mechanism of a traditional pedal bicycle includes a center shaft assembly, a crank assembly, a rear wheel shaft assembly, and a driving chain plate, a chain, and a driven sprocket assembly; its power comes from the continuous circular motion of human legs, The left and right cranks and the driving chain plate are driven to rotate continuously 360°, and the power is transmitted from the driving chain plate to the driven sprocket and finally to the rear wheel shaft through the chain, so that the bicycle can move forward.

Traditional pedal bicycles have poor driving performance and laborious riding, which is mainly related to the driving mode. Limited by the movement distance of the human legs and the minimum ground clearance of the pedals, the design length of the crank can only be limited to a small range. . The circular driving mode of the crank and the active chain plate makes the two legs of the cyclist have a large difference in height and height, and the high-efficiency driving angle is very small. During the 360° rotation process of the crank, there is a problem of upper and lower dead centers, which leads to insufficient utilization of the effective force arm, large crank reset stroke, difficulty in grasping the optimal force angle, and difficulty in fully exerting the power of the human body; at the same time, the crank Rotating in a full circle, the length of the crank is limited by the distance from the center of rotation to the ground, or by the stretchable length of the leg of the forcer, resulting in heavy operation and high physical energy consumption of this type of pedal bicycle.

There are several existing pedal bicycles with different driving methods. The crank does not turn a full circle, but is reciprocatingly driven within a certain angle. Specifically, the pedals used for driving are lengthened to provide conditions for the lengthening of the driving force arm. The length of the pedal mentioned here is a physical concept, and the length of the moment arm is a physical quantity related to the direction of the force, which is the length of the right-angled side corresponding to the acute angle between the pedal and the direction of the force. For example, there is one, the rotation axis of its force arm is near the rear wheel shaft, the force arm is longer, and it is driven reciprocatingly within a certain angle; it uses the driving force arm to drive the resistance arm, and the resistance arm drives the eccentric wheel to rotate through the connecting rod , the eccentric wheel and the rear wheel are coaxially fixed, so that the rear wheel is driven, but as long as the eccentric wheel rotates a full circle or the crank rotates a full circle in the driving device, the length of the moment arm will change periodically. Assuming that the force direction and magnitude of the human leg are always determined and unchanged, in this case, the change curve of the length of the moment arm is a sinusoidal curve. According to cycling experience, the actual situation is that the force exerted by the leg is related to physical strength, but the force applied by the leg The direction of the force changes in a small interval, mainly near the position where the legs can be stretched the most. Therefore, the above assumptions are of qualitative value for research and analysis. Then it can be concluded that: the force of this kind of human-driven transportation equipment The output curve will have troughs and crests. The highest point of the crest corresponds to the moment when the moment arm is equal to the length of the crank, and the troughs and crests occupy the same proportion of the phase period, so the driving efficiency is the same as that of a traditional bicycle. Although the length of the force arm of this reciprocating mechanism is not limited by the distance between the rotation axis and the ground, but by the telescopic distance of the legs, its actual force arm is the length of the driving force arm minus the resistance arm. The shorter the moment arm, the harder it is.

There is also a bicycle that enters the market now, produced by Chongqing Qikebi Bicycle Co., Ltd., called random ride, patent CN201210036555.2. The one-way bearing in the one-way overrunning clutch is used in the first-level position, and the advantages of the one-way bearing can be adjusted arbitrarily. The resistance arm is the radius of the one-way bearing, which is much smaller than the length of the power arm, but it is different from the traditional bicycle. The riding style is the same. Its power arm still turns a full circle like the crank of a traditional bicycle. The length is naturally limited by the distance between the axis and the ground. In order to allow the human leg to apply force at any angle, there is no force arm limiter. The disadvantage is that when the stretching amount of the legs is greater than the length of the crank, the actual length of the arm will be shorter than the length of the crank; and the arm can rotate a full circle and cannot touch the ground. There are structural shortcomings: the use of one-way bearings is abandoned Finally, the length of the pedal can be set to be much greater than the distance from the pedal axis to the ground to increase the favorable conditions for the power arm and the actual driving force arm; The bridge gear makes the left and right driving arms associated, and its shortcoming is that the independent and simultaneous double drive of the left and right driving arms cannot be realized. Although it can be stepped on both positive and negative, or through the initial setting of the left and right crank angles less than 180 degrees, even if the same direction is alternately stepped on, the output curve of the driving force can be converted from the trough of the traditional bicycle to the peak, but due to this initial setting "Hard" association, in the actual riding process, the rider cannot independently and more effectively select the peak section of the driving force output; in addition, due to the blocking of the bridge gear added between the left and right cranks, the installation position of the entire device It is limited, for example, it is impossible to realize that the center shaft, that is, the driving chain disc shaft, cannot be coaxial with the rear wheel, that is, the driving wheel, so that the extremely simplified design of the whole vehicle cannot be realized, and especially the longer favorable conditions for realizing the driving arm are wasted; in addition It does not have a neutral clutch device, and it is easy to cause damage to the components of the transmission system when the reverse wheel force is too large.

After years of experimental research and related patent searches, the shortcomings and deficiencies of the existing background technologies are listed above.

technical problem

The present invention provides a kind of pedal bicycle for overcoming the weak point of above-mentioned prior art through technology and patent navigation.

the

technical solution

The technical scheme that present embodiment adopts for solving technical problem is: comprise vehicle frame, and the manpower variable-speed driving device that is installed in vehicle frame, steering gear, front wheel, rear wheel;

The manual variable-speed driving device includes: a frame, a force applying handle, a main drive shaft, a one-way overrunning clutch, a reset device, and a gear set, one end of the force applying handle is fixed to the input end of the one-way overrunning clutch, and the The output end of the one-way overrunning clutch is fixed on the main power shaft, and the force-applying handle reciprocates around the main power shaft and sweeps the fan-shaped surface to perform work, and the driving force arm corresponding to the force-applying handle directly drives the input end of the one-way overrunning clutch in both positive and negative directions. Rotate, thereby intermittently driving the output end of the one-way overrunning clutch to rotate in one direction;

The speed change gear set is an angular speed increasing gear set, including an input end gear, an intermediate speed change gear set and a terminal gear which are sequentially connected by transmission; the output end of the one-way overrunning clutch is fixedly connected with the input end gear through the main drive shaft , the rear wheel is fixedly connected with the terminal gear;

The length of the force application handle is greater than the movement stroke of the force application part of the human body under human drive, that is, the fan shape swept by the force application handle around the main power axis is a fan shape less than 60 degrees, and there is a fan between the force application handle and the frame. A limit device that ensures that the force application handle rotates less than 60 degrees around the main power axis;

The one-way overrunning clutch is a one-way bearing or a ratchet with a sensitivity greater than 143 rings;

The reset device is installed between the frame and the force application handle, and when the force application handle completes a drive, the reset device provides the force application handle with a pulling force for reset;

The frame is arranged on the vehicle frame, and the rear wheel is fixedly connected with the terminal gear of the manual variable speed driving device;

The steering device is connected with the front wheels.

As a further technical solution of the present invention, the limiting device includes a hollow limiting shell, the limiting shell is covered on the one-way overrunning clutch, a vertical limiting opening is opened on the edge of the limiting shell, and the force applying handle is inserted into the Pass the limit port, the angle between the upper and lower edges of the limit port and the center of the one-way overrunning clutch is between 30-60°.

As a further technical solution of the present invention, the reset device is a rigid lever or a flexible steel wire erected on the vehicle frame and connected to two independent force application handles. When the two independent force application handles move alternately, they are mutually Providers of reset pull for each other.

As a further technical solution of the present invention, the reset device can also be an elastic reset device, the elastic reset device is installed on the position limiting device, and the elastic reset device exerts an upward elastic force on the force applying handle, and the elastic reset device includes Extension spring and reed, one end of the extension spring is fixedly connected with the inner wall of the limit case, and the other end is fixedly connected with the force application handle; the reed is installed on the inner wall of the lower edge of the limit opening of the limit case; both the reed and the extension spring located inside the limiting case.

As a further technical solution of the present invention, the rotation axes of the input gear, the intermediate transmission gear and the final gear are parallel.

As a further technical solution of the present invention, when the speed change gear set is a two-stage speed increase, the intermediate speed change gear set includes a first speed change gear and a second speed change gear, and the first speed change gear and the second speed change gear are coaxial Fixed, the input gear is in transmission cooperation with the first transmission gear, and the second transmission gear is in transmission cooperation with the terminal gear; the input gear, the intermediate transmission gear set and the terminal gear are meshed directly or through a chain; the input gear The transmission ratio range with the first speed change gear is 3:1~12:1, and the transmission ratio range between the second speed change gear and the terminal gear is 3:1~12:1.

As a further technical solution of the present invention, a neutral device is installed on the frame, and the neutral device includes a neutral trigger and a neutral clutch; the neutral trigger includes a passive trigger and an active trigger; the passive trigger It is a passive clutch trigger lever installed on the upper edge of the limit port. The passive clutch trigger lever links the neutral clutch through a pull wire or a connecting rod. The device is an active clutch actuating lever installed at the handle position on the frame, and the active clutch actuating lever links the neutral clutch through a pull wire; the neutral clutch is used for the clutch between the intermediate transmission gear set and the terminal gear or the clutch between the terminal gear and the wheel.

As a further technical solution of the present invention, the transmission gear set is a chain meshing, and the neutral clutch is used for the clutch of the intermediate transmission gear set and the final gear, and the neutral clutch includes a chain tensioning gear meshed with the chain, a clutch derailleur gear ; The neutral trigger controls the position change of the clutch derailleur gear through the pull wire or the connecting rod, so as to make the clutch between the chain and the terminal gear.

As a further technical solution of the present invention, the steering device includes a handle and a steering shaft, the steering shaft is rotatably connected to the vehicle frame, the handle is connected to the top end of the steering shaft, and the front wheel is connected to the bottom end of the steering shaft; The force handles are respectively arranged on both sides of the center line of the vehicle frame.

As a further technical solution of the present invention, there is one rear wheel, which is a driving wheel, the rear wheel is rotatably connected to the main power shaft, the axes of the input gear, the terminal gear and the driving wheel shaft coincide, and the main power shaft and the vehicle frame Connected by bearing rotation, the main power shaft is parallel to the shaft of the intermediate speed change gear set, and the shaft of the intermediate speed change gear set is connected to the vehicle frame in rotation.

Beneficial effect

The beneficial effects of the present invention are:

The invention improves the output efficiency of the force, so that the ratio of the peak phase of the output force to the trough is greater than that of the conventional rotary crank type; the invention overcomes the existing bicycles or electric bicycles with short force arms, idle travel on the transmission, and vigorous output of the body movement range The defect of low efficiency has the obvious advantages of compact structure, long moment arm, no idle space on the transmission, comfort and safety, especially for two-wheeled or three-wheeled bicycles with rear-wheel single-wheel drive, the pedal lever can be rotated from the rear wheel shaft The front extension is designed to maximize the length of the driving arm.

Description of drawings

Fig. 1 is the curve schematic diagram corresponding to the driving force output size of the mechanics principle of the present invention and pedal;

Fig. 2 is each device schematic diagram of the present invention;

Fig. 3 is a schematic diagram of a structure diagram of a pedal bicycle proposed by the present invention;

Fig. 4 is a schematic diagram of a structure diagram of a pedal bicycle proposed by the present invention;

Fig. 5 is a schematic diagram of the structure diagram of the speed change device proposed by the present invention;

Fig. 6 is a schematic front view of another embodiment of the speed change device proposed by the present invention;

Fig. 7 is a top view shown in Fig. 6;

Fig. 8 is a schematic diagram of the structure of the input drive gear and the output drive gear in different axes proposed by the present invention;

Fig. 9 is a schematic diagram of the installation structure diagram of the neutral device proposed by the present invention;

Fig. 10 is a schematic diagram of the implementation structure diagram of the neutral device proposed by the present invention;

Fig. 11 is a schematic diagram of another implementation structure diagram of the neutral device proposed by the present invention;

Figure 12 is a schematic diagram of the installation structure of the limiting device and the elastic reset device proposed by the present invention;

in:

1-frame, 2-applying handle, 3-main drive shaft, 4-one-way overrunning clutch, 5-limiting device, 6-resetting device, 7-steering device, 8-speed gear set, 9-clutch device , 10 - wheel;

21 - foot pedal;

51-limiting shell, 52-limiting mouth;

61-reed, 62-extension spring;

81-input gear, 82-intermediate gear set, 83-terminal gear;

821-the first speed change gear, 822-the second speed change gear;

91-passive clutch trigger lever, 92-guy wire, 93-guy wire, 94-chain, 95-chain holding gear, 96-clutch derailleur gear, 97-clutch spring, 98-fixing plate, 99-gear mounting plate, 90 - cable fixing holes;

101-front wheel, 102-rear wheel.

BEST MODE FOR CARRYING OUT THE INVENTION

Describe the specific embodiment of the present invention below in conjunction with accompanying drawing and embodiment:

Figure 1 is the design efficiency index that guides the target ideal state of our design. The output curve of the product power that is finally designed and produced is the short-period thick wavy line in the lower part of Figure 1, which achieves the ultimate beneficial effect of the present invention.

Fig. 2 is exactly the logic diagram between each device of the present invention, and the arrow represents the direction of force transmission, and the force output device is the rear wheel that is connected with the transmission device.

It includes a vehicle frame 1, and a manual variable speed drive device installed on the vehicle frame, a steering device 7, a front wheel 101, and a rear wheel 102;

The manpower variable speed driving device includes: frame, force application handle 2, main drive shaft 3, one-way overrunning clutch 4, reset device 6, speed change gear set 8, one end of force application handle is fixed with the input end of one-way overrunning clutch, The output end of the overrunning clutch is fixed on the main power shaft, the force application handle reciprocates around the main power shaft and sweeps the fan-shaped movement to do work, and the driving force arm corresponding to the force application handle directly drives the input end of the one-way overrunning clutch to rotate positively and negatively in both directions , thereby intermittently driving the output end of the one-way overrunning clutch to rotate in one direction;

The speed change gear set is an angular speed increase gear set, including the input end gear 81, the intermediate speed change gear set 82 and the terminal gear 83 which are connected in sequence; the output end of the one-way overrunning clutch is fixedly connected with the input end gear through the main power shaft, and the rear wheel Fixedly connected with the terminal gear;

The length of the force application handle is greater than the movement stroke of the force application part of the human body under human drive, that is, the fan shape swept by the force application handle around the main power axis is a fan shape less than 60 degrees, and there is a device between the force application handle and the frame to ensure that it is less than 60 degrees. 60 degree limit device;

The reset device is installed between the frame and the force-applying handle. When the force-applying handle completes a drive, the reset device provides the pulling force for reset to the force-applying handle;

The frame is set on the frame, and the rear wheels are connected with the terminal gear of the manual variable speed drive device;

The steering unit is connected to the front wheels.

The limit device includes a hollow limit shell 51, which is covered on the one-way overrunning clutch, and the edge of the limit shell is provided with a vertical limit port 52, and the force-applying handle passes through the limit port, and the limit port goes up and down. The angle between the center and the one-way overrunning clutch is between 30-60°.

The reset device is a rigid lever or a flexible steel wire that is erected on the vehicle frame and connected with two independent force applying handles. When the two independent force applying handles move alternately, they serve as providers of reset tension for each other.

Resetting device can also be elastic resetting device, and elastic resetting device is installed on the limit device, and elastic resetting device applies upward elastic force to force application handle, and elastic resetting device comprises extension spring 62 and reed 61/torsion spring, and one end of extension spring It is fixedly connected with the inner wall of the limit case, and the other end is fixedly connected with the force application handle; the reed/torsion spring is installed on the inner wall of the lower edge of the limit opening of the limit case; both the reed and the tension spring are located inside the limit case.

The axes of rotation of the input gear, the intermediate transmission gear and the final gear are parallel.

When the speed change gear set is a two-stage speed increase, the intermediate speed change gear set includes a first speed change gear 821 and a second speed change gear 822, the first speed change gear and the second speed change gear are coaxially fixed, and the input end gear and the first speed change gear drive Coordination, transmission coordination between the second speed change gear and the final gear; the input gear, the intermediate speed gear set and the final gear are meshed directly or through a chain; the transmission ratio range of the input gear and the first speed gear is 3:1~12:1 , the transmission ratio range of the second speed change gear and the final gear is 3:1~12:1.

A neutral gear device is installed on the frame, and the neutral gear device includes a neutral gear trigger and a neutral gear clutch; the neutral gear trigger includes a passive trigger and an active trigger; the passive trigger is a passive clutch trigger lever 91 installed on the limit port, and the passive clutch trigger lever The neutral clutch is linked by the pull wire 93 or the connecting rod. When the force-applying handle rotates upwards and touches the passive clutch trigger lever, the passive trigger works; the active trigger is the active clutch trigger lever installed at the handle position on the frame. The trigger lever links the neutral clutch through the pull wire 92; the neutral clutch is used for the clutch of the intermediate transmission gear set and the terminal gear or the clutch of the terminal gear and the wheel.

The shifting gear set is chain meshing, and the neutral clutch is used for the clutch of the intermediate shifting gear set and the terminal gear. The neutral clutch includes a chain tensioning gear 95 meshing with a chain 94 and a clutch derailleur gear 96; the neutral trigger is controlled by a pull wire or a connecting rod The position of the clutch derailleur gear changes to make the clutch between the chain 94 and the terminal gear.

The neutral clutch of this embodiment also includes a fixed plate 98 and a gear mounting plate 99, the fixed plate is fixedly connected to the frame, the gear mounting plate and the fixed plate are rotatably connected through a shaft hole, and the chain holding gear and the clutch derailleur gear are installed on the gear. A backguy fixing hole 90 is installed on the fixing plate, and the wire core of the backguy is fixedly connected with the gear mounting plate, and a clutch spring 97 is connected between the fixing plate and the gear mounting plate. When the trigger lever is touched, the wire core is pulled, and the gear mounting plate rotates around the fixed plate, so that the positions of the chain holding gear and the clutch derailleur gear change, and the chain holding gear pulls the chain 94 apart, so that the chain 94 is separated from the terminal gear , to achieve neutral.

The steering device includes a handle and a steering shaft, the steering shaft is connected to the frame in rotation, the handle is connected to the top of the steering shaft, and the front wheel is connected to the bottom of the steering shaft; two force-applying handles are respectively arranged on both sides of the centerline of the frame .

There is one rear wheel in this embodiment, and it is a driving wheel. The rear wheel is rotatably connected to the main power shaft. The axes of the input gear, the terminal gear and the driving wheel shaft are coincident. The shaft is parallel to the shaft of the intermediate speed change gear set, and the shaft of the intermediate speed change gear set is rotatably connected to the vehicle frame.

In the embodiment of the present invention, a pedal 21 is installed on each of the two force applying handles.

In the embodiment of the present invention, when the two pedals are not connected, the two pedals are driven synchronously and in the same direction, so that the area of force exerted by the limbs is increased, and the left and right feet share the driving force, which makes the force exerted lightly and improves Comfortable when driving manually, but the driving is not continuous, suitable for slow scenes. When the two pedals are connected, the two pedals are driven asynchronously, and the body only drives one of the pedals at the same time. The left foot or the right foot alternately bears the driving force, and the driving is continuous, which is suitable for fast scenes.

A non-manpower auxiliary input device can also be configured for a human-powered bicycle, that is, a power device is configured, including a motor and a drive shaft, the motor is arranged on the frame, the motor is connected to the battery, the drive shaft is connected to the output end of the motor, and the output end of the drive shaft is connected shaft.

The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and can also be made within the scope of knowledge of those of ordinary skill in the art without departing from the gist of the present invention. These changes involve related technologies well known to those skilled in the art, and these all fall within the protection scope of the patent of the present invention.

Claims

A pedal bicycle is characterized in that it includes: a vehicle frame, and a manual variable speed drive device installed on the vehicle frame, a steering device, a front wheel, and a rear wheel;

The manual variable-speed driving device includes: a frame, a force applying handle, a main drive shaft, a one-way overrunning clutch, a reset device, and a gear set, one end of the force applying handle is fixed to the input end of the one-way overrunning clutch, and the The output end of the one-way overrunning clutch is fixed on the main power shaft, and the force-applying handle reciprocates around the main power shaft and sweeps the fan-shaped surface to perform work, and the driving force arm corresponding to the force-applying handle directly drives the input end of the one-way overrunning clutch in both positive and negative directions. Rotate, thereby intermittently driving the output end of the one-way overrunning clutch to rotate in one direction;

The speed change gear set is an angular speed increasing gear set, including an input end gear, an intermediate speed change gear set and a terminal gear which are sequentially connected by transmission; the output end of the one-way overrunning clutch is fixedly connected with the input end gear through the main drive shaft , the rear wheel is fixedly connected with the terminal gear;

The length of the force application handle is greater than the movement stroke of the force application part of the human body under human drive, that is, the fan shape swept by the force application handle around the main power axis is a fan shape less than 60 degrees, and there is a fan between the force application handle and the frame. A limit device that ensures that the force application handle rotates less than 60 degrees around the main power axis;

The one-way overrunning clutch is a one-way bearing or a ratchet with a sensitivity greater than 143 rings;

The reset device is installed between the frame and the force application handle, and when the force application handle completes a drive, the reset device provides the force application handle with a pulling force for reset;

The frame is arranged on the vehicle frame, and the rear wheel is fixedly connected with the terminal gear of the manual variable speed driving device;

The steering device is connected with the front wheels.
A pedal bicycle according to claim 1, characterized in that, the limiting device comprises a hollow limiting shell, the limiting shell is covered on the one-way overrunning clutch, and the edge of the limiting shell is provided with a vertical Limiting opening, the force-applying handle passes through the limiting opening, and the angle between the upper and lower edges of the limiting opening and the center of the one-way overrunning clutch is between 30-60°.
A pedal bicycle according to claim 1, characterized in that, the reset device is a rigid lever or a flexible steel wire erected on the frame and connected to two independent force application handles, when two independent force application handles When the handles move alternately, they are each other's reset pulling force providers.
A pedal bicycle according to claim 1, characterized in that, the reset device can also be an elastic reset device, the elastic reset device is installed on the limit device, and the elastic reset device applies an upward force to the force applying handle. Elastic force, the elastic reset device includes a tension spring and a reed, one end of the tension spring is fixedly connected to the inner wall of the limiting case, and the other end is fixedly connected to the force applying handle; the reed is installed on the lower edge of the limit opening of the limiting case The inner wall; the reed and the extension spring are all located inside the limiting shell.
The pedal bicycle according to claim 1, characterized in that, the rotation axes of the input gear, the intermediate speed change gear and the final gear are parallel.
A bicycle according to claim 1, characterized in that, when the speed change gear set is a two-stage speed increase, the intermediate speed change gear set includes a first speed change gear and a second speed change gear, and the first speed change The gear and the second transmission gear are coaxially fixed, the input gear is in transmission cooperation with the first transmission gear, and the second transmission gear is in transmission cooperation with the terminal gear; the input terminal gear, the intermediate transmission gear set and the terminal gear are directly meshed Or through the meshing of the chain; the transmission ratio range of the input gear and the first transmission gear is 3:1~12:1, and the transmission ratio range of the second transmission gear and the final gear is 3:1~12:1.
A kind of pedal bicycle according to claim 1, characterized in that, a neutral device is installed on the frame, and the neutral device includes a neutral trigger and a neutral clutch; the neutral trigger includes a passive trigger and an active Trigger; the passive trigger is a passive clutch trigger lever installed on the upper edge of the limit port. The passive clutch trigger lever links the neutral clutch through a pull wire or a connecting rod. The trigger works; the active trigger is an active clutch trigger lever installed at the handle position on the frame, and the active clutch trigger lever links the neutral clutch through a pull wire; the neutral clutch is used for the clutch of the intermediate transmission gear set and the terminal gear or It is the clutch between the terminal gear and the wheel.
A pedal bicycle according to claim 7, characterized in that, the transmission gear set is a chain meshing, and the neutral clutch is used for clutching the intermediate transmission gear set and the final gear, and the neutral clutch includes a chain meshing with the chain The holding gear and the clutch derailleur gear; the neutral trigger controls the position change of the clutch derailleur gear through the pull wire or connecting rod, so as to make the chain and the terminal gear clutch.
A kind of pedal bicycle according to claim 1, characterized in that, the steering device comprises a handle and a steering shaft, the steering shaft is rotatably connected to the vehicle frame, the handle is connected to the top of the steering shaft, and the front wheel is connected to the top of the steering shaft. The bottom end; the two force-applying handles are respectively arranged on both sides of the centerline of the vehicle frame.
A kind of pedal bicycle according to claim 1, characterized in that there is one rear wheel, which is a driving wheel, and the rear wheel is rotatably connected with the main power shaft, and the axis of the input gear, the terminal gear and the driving wheel shaft Coincidentally, the main drive shaft is connected to the vehicle frame through bearing rotation, the main drive shaft is parallel to the shaft of the intermediate speed change gear set, and the shaft of the intermediate speed change gear set is connected to the vehicle frame in rotation.