CN114475903A - A transmission mechanism and a bicycle without dead point - Google Patents

Abstract

The invention discloses a transmission mechanism and a dead-point-free bicycle, and belongs to the technical field of vehicles. The transmission mechanism includes: a drive wheel for inputting power; the driven wheel is arranged beside the driving wheel, is positioned at the same height position with the driving wheel and is used for outputting power; the connecting rod is in transmission connection with the driving wheel and the driven wheel respectively; three mounting positions I are uniformly distributed at the edge of the end face of the driving wheel; three mounting positions II are uniformly distributed at positions corresponding to the edge of the end face of the driven wheel; the number of the connecting rods is three, two ends of each connecting rod are respectively and rotatably connected with the corresponding first mounting position and the second mounting position, and the three connecting rods are parallel to each other. According to the dead-point-free bicycle, by applying the transmission mechanism disclosed by the invention, when the bicycle is ridden, the pedal crank and the pedal input power, a dead point position cannot occur in the process, the riding experience is improved, the power input is optimized, the bicycle is easier to ride, and the defects that a chain is not required to be used, the chain is not dropped and the like cannot occur.

Description

A transmission mechanism and a bicycle without dead point

technical field

The invention belongs to the technical field of vehicles, and more particularly relates to a transmission mechanism and a bicycle without a dead point.

Background technique

The transmission part of the traditional bicycle is composed of pedals, cranks, sprockets, central shafts, chains and flywheels. The movement process is that the cyclist's feet step on the pedals to drive the crank to rotate, and the power is transmitted from the sprocket to the flywheel on the rear axle through the chain to drive the wheels to rotate forward.

In the process of driving the crank to rotate, the magnitude and direction of the force of the sole of the foot on the pedal varies with the position of the crank. During the rotation of the crank, each side of the crank has to pass twice perpendicular to the ground. This position is equivalent to the "dead point" of the mechanism. In order to pass this position smoothly, the rider generally needs to use the inertia during the crank rotation or apply extra force sideways to bypass this "dead point", especially in rough terrain. Riders tend to feel more strenuous when driving on uneven surfaces or climbing hills.

After retrieval, Chinese Patent Publication No.: CN 106428405 A; Publication date: February 22, 2017; Disclosed is a bicycle without a dead center driving center axle, including: a driving device and a driven device, and the driving device includes: the first A crank, a first pedal and a second crank rotatably mounted on the rotating end of the first crank, and a second pedal rotatably mounted on the rotating end of the second crank, wherein the driving device further comprises: The first center shaft at the fixed end of the first crank, the second center shaft fixedly connected to the fixed end of the second crank, the first gear fixedly connected to the end of the first center shaft away from the first crank, and the a second gear at one end of the second center shaft away from the second crank, an intermediate shaft, a first driven gear fixed on one end of the intermediate shaft and meshing with the first gear, and a first driven gear fixed in the middle The other end of the shaft is a second driven gear that meshes with the second gear; the driven device includes a crankset fixedly mounted on the first center shaft or on the second center shaft; or, the The driven device includes a bevel tooth fixedly installed at one end of the intermediate shaft; the included angle between the first crank and the second crank varies, and any one of the first crank and the second crank rotates to the same angle as the second crank. When the ground is vertical, the other crank is not vertical to the ground. In this application, the driving components of the bicycle are improved, so that the angle between the first crank and the second crank changes during operation, and does not appear at the dead center of the force at the same time, thereby overcoming the defect of the dead center, but this The structural design of the application requires a large structural improvement at the position of the bicycle crank pedal, which on the one hand needs to occupy a large space, and on the other hand, the structure is difficult to solve the defect of the chain falling.

Another example, Chinese Patent Publication No.: CN 211001695 U; Publication date: July 14, 2020; discloses a bicycle pedal device without dead point, including a driven rod with a left-right phase difference of 180 degrees, a pedal, The frame also includes two rear axles, two intermediate rods, and two main driving rods, the intermediate rods are in the same direction as the main driving rods, the intermediate rods are fixedly connected with the inner ends of the axles, and the main driving rods and the axles The outer end is fixedly connected, the rear axle is rotatably connected with the frame, the middle rod is provided with a track groove, the driven rod is provided with a roller, the roller rolls along the track groove, and the main driving rod is rotatably connected with the pedal. In the structure of the application, when the foot pedal on one side is stepped to the lowest position, the main driving rod on the other side is inclined forward by an angle, so that there is no dead center when pedaling. In the actual riding process, the pedal force and pedal experience of the bicycle are not good, so it is difficult to popularize and apply.

SUMMARY OF THE INVENTION

In order to solve at least one of the above technical problems, according to an aspect of the present invention, a transmission mechanism is provided, comprising:

a driving wheel, which is used to input power;

The driven wheel, which is arranged beside the driving wheel and at the same height as the driving wheel, is used for outputting power;

a connecting rod, which is respectively connected with the driving wheel and the driven wheel;

There are three installation positions evenly distributed at the edge of the end face of the driving wheel;

There are three installation positions evenly distributed at the corresponding positions of the edge of the end face of the driven wheel;

There are three connecting rods, two ends of each connecting rod are respectively rotatably connected with the corresponding installation position 1 and installation position 2, and the three connecting rods are parallel to each other.

According to the transmission mechanism of the embodiment of the present invention, optionally, the driving wheel and the driven wheel are arranged on different sides of the connecting rod.

According to an aspect of the present invention, there is provided a bicycle without a dead point, comprising:

a transmission mechanism, which is the aforementioned transmission mechanism of the present invention;

The main body of the frame, the transmission mechanism is installed on the rear fork and the down tube of the main body of the frame;

The front wheel, which is installed under the front end of the frame body;

a rear wheel, which is installed under the rear end of the main body of the frame, and the driven wheel of the transmission mechanism is drivingly connected to the rear wheel;

The crank pedal, which is connected with the driving wheel of the transmission mechanism, is used for inputting power.

According to the dead-center-free bicycle according to the embodiment of the present invention, optionally, there are two transmission mechanisms, which are respectively arranged on both sides of the frame body.

According to the dead-point-free bicycle according to the embodiment of the present invention, optionally, a transmission position is axially provided at the center of the driving wheel of the transmission mechanism, and the crank pedals input power to the driving wheel through the transmission position.

According to the dead center-free bicycle according to the embodiment of the present invention, optionally, the driven wheel of the transmission mechanism is a gear.

Optionally, the dead-center-free bicycle according to the embodiment of the present invention further includes a speed regulating mechanism, which is drivingly connected with the driven wheel and the rear wheel, and is used for adjusting the transmission ratio of the driven wheel and the rear wheel.

According to the dead-point-free bicycle according to the embodiment of the present invention, optionally, the speed regulating mechanism includes:

an idler wheel, which is mounted on the chainstay, and the idler wheel is engaged with the driven wheel;

The pinion gear is in transmission connection with the axle center of the rear wheel, and the pinion gear meshes with the idler gear.

According to the dead center bicycle according to the embodiment of the present invention, optionally,

the pinion is arranged between the driven wheel and the chainstay;

The thickness of the idler gear is greater than the sum of the thicknesses of the driven gear and the pinion.

The dead-spot-free bicycle according to the embodiment of the present invention, optionally, further includes:

The protective shell is covered on the outside of the driven wheel and the speed regulating mechanism, and the protective shell is fixedly connected with the main body of the vehicle frame.

beneficial effect

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

(1) The transmission mechanism of the present invention can effectively overcome the dead point position in the rotation process of the driving wheel, effectively utilize the force of the human body, exert the maximum function of human physiology, and replace the chain drive, avoiding the occurrence of off-chain phenomenon, More suitable for application in the field of bicycle transmission;

(2) In the bicycle without dead point of the present invention, when riding, the pedals are pedaled to input power, and the dead point position will not appear during the process, which improves the riding experience, optimizes the power input, and makes the riding easier. Moreover, the dead-point-free bicycle of the present invention does not need to use a chain, and there will be no defects such as chain drop;

(3) In the dead-point-free bicycle of the present invention, the two transmission mechanisms are respectively arranged on the left and right sides of the frame body, and cooperate with the two crank pedals to input power at the same time, which is more in line with the riding action design of the human body, and also improves the power input;

(4) The dead-point-free bicycle of the present invention is designed with a speed regulating mechanism, which is convenient to control the appropriate transmission ratio between the driven wheel and the rear wheel according to the riding needs, and is convenient for riding;

(5) The dead-point-free bicycle of the present invention adopts a speed regulating mechanism composed of an idler wheel and a pinion, which has a simple structure, occupies a small installation space, and is convenient for the manufacture of the bicycle and the installation design of other components;

(6) The dead-point-free bicycle of the present invention is provided with a protective shell, which plays a protective role on the part of the gear structure, prevents dust and debris, and avoids affecting the gear transmission.

Description of drawings

In order to explain the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present invention, rather than limit the present invention. .

Fig. 1 shows the schematic diagram of the transmission mechanism of the present invention;

Fig. 2 shows another perspective schematic diagram of the transmission mechanism of the present invention;

Fig. 3 shows the schematic diagram of the bicycle without dead point of the present invention;

Fig. 4 shows the schematic diagram of the position of the transmission mechanism in the bicycle without dead center of the present invention;

Fig. 5 shows another perspective schematic diagram of the position of the transmission mechanism in the dead center bicycle of the present invention;

Figure 6 shows a half-section view of the dead-center bicycle of the present invention;

Fig. 7 shows the enlarged view at A in Fig. 6;

FIG. 8 shows a schematic diagram of the bicycle without a dead center of Embodiment 9;

Reference number:

1, transmission mechanism; 10, driving wheel; 100, installation position one; 101, transmission position; 11, driven wheel; 110, installation position two; 111, installation shaft; 12, connecting rod;

2. Frame body; 20. Seat fork; 21. Chain stay; 22. Down tube; 23. U-shaped frame; 24. Mounting frame;

3. Front wheels;

4. Rear wheel;

5. Crank pedal;

6. Speed regulating mechanism; 60. Idler; 61. Pinion;

7, protective shell.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some, but not all, embodiments of the present invention.

Unless otherwise defined, technical or scientific terms used herein should have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The terms "first", "second" and similar terms used in the description of the patent application and the claims of the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. Likewise, "a" or "an" and the like do not denote a quantitative limitation, but rather denote the presence of at least one.

Due to the structural design characteristics of the existing bicycles, there is a dead center position during the riding process, and the rider needs to exert extra force to bypass this dead center position, especially when driving on a rough road or climbing a slope. Riding is more strenuous, and in the process, it is easy to cause the chain to vibrate and cause the chain to fall. In view of the above defects, in order to more effectively utilize the force of the human body, exert the maximum function of human physiology, and avoid the "dead point" during the rotation of the crank " position, to avoid the phenomenon of chain drop, the invention proposes a transmission mechanism and a bicycle without dead point.

Example 1

The transmission mechanism of this embodiment includes,

a driving wheel 10, which is used for inputting power;

The driven wheel 11, which is arranged beside the driving wheel 10 and at the same height position as the driving wheel 10, is used for outputting power;

the connecting rod 12, which is respectively connected with the driving wheel 10 and the driven wheel 11;

It is characterized by:

The edge of the end face of the driving wheel 10 is evenly distributed with three installation positions - 100;

There are three installation positions 2 110 evenly distributed at the corresponding positions of the edge of the end face of the driven wheel 11;

There are three connecting rods 12 , two ends of each connecting rod 12 are rotatably connected to the corresponding installation position 1 100 and installation position 2 110 respectively, and the three connecting rods 12 are parallel to each other.

As shown in FIGS. 1 and 2 , in the transmission mechanism of this embodiment, three installation positions-100 are evenly distributed at the edge of the end face of the driving wheel 10, and the central angles of two adjacent installation positions-100 are both 120°. Similarly Also, three installation positions 2 110 are evenly distributed at the edge of the end face of the driven wheel 11, and the central angles of the two adjacent installation positions 110 are also 120°. The driving wheel 10 and the driven wheel 11 have the same height position, and the installation positions One 100 corresponds to the initial height position of the second installation position 110 one-to-one, and the two ends of the connecting rod 12 are rotatably connected to the driving wheel 10 and the driven wheel 11 through the corresponding installation positions. After the connecting rods 12 are connected to the corresponding installation positions, they are in a horizontal state with each other. Further, it is assumed that the end faces of the driving wheel 10 and the driven wheel 11 are arranged vertically. After the three connecting rods 12 are installed and connected, they are all in different vertical planes. At the position, when the driving wheel 10 and the driven wheel 11 rotate, the three connecting rods 12 will not interfere with each other.

The present embodiment utilizes a three-link transmission mechanism, which can effectively overcome the dead center position during the rotation of the driving wheel 10, effectively utilize the force of the human body, exert the maximum physiological function of the human body, and replace the chain drive to avoid the phenomenon of off-chain. The emergence of it is more suitable for application in the field of bicycle transmission.

Example 2

The transmission mechanism of this embodiment is further improved on the basis of Embodiment 1. The driving wheel 10 and the driven wheel 11 are arranged on different sides of the connecting rod 12 .

As shown in FIGS. 1 and 2 , in this embodiment, one end of the connecting rod 12 is rotatably connected to the right end face of the driving wheel 10 , and the other end of the connecting rod 12 is rotatably connected to the left end face of the driven wheel 11 . The arrangement can further facilitate the setting of the power input structure and the power output structure at the driving wheel 10 and the driven wheel 11, avoid interference between the structure and the connecting rod 12, and ensure the normal transmission operation.

Example 3

The dead-spot-free bicycle of this embodiment includes:

Transmission mechanism 1, which is the transmission mechanism of Embodiment 2;

The frame main body 2, the transmission mechanism 1 is installed on the rear lower fork 21 and the down tube 22 of the frame main body 2;

the front wheel 3, which is installed under the front end of the frame body 2;

The rear wheel 4 is installed under the rear end of the frame main body 2, and the driven wheel 11 of the transmission mechanism 1 is connected to the rear wheel 4 in a driving manner;

The crank pedal 5 is in driving connection with the driving wheel 10 of the transmission mechanism 1 for inputting power.

As shown in FIG. 3, the frame body 2 includes the necessary structures of a conventional bicycle body, such as the front part, the seat and the frame, the front part includes the handlebar, the head tube, the shock absorber, the front brake and the front fork, etc., the seat Including seat cushions, seat pillars, etc. The frame includes an upper tube, a lower tube 22, a seat tube, a seat fork 20 and a chain fork 21. The frame body 2 is a common structure of a conventional bicycle, and will not be repeated here.

In this embodiment, the transmission mechanism 1 is installed at the position of the chain stay 21 and the down tube 22 of the frame body 2, that is, the driving wheel 10 is fixed at the position of the down tube 22, and the driven wheel 11 is fixed at the position of the chain fork 21, and further Ground, the front wheel 3 is installed under the front end of the frame main body 2 and at the front fork, and the rear wheel 4 is installed under the rear end of the frame main body 2, that is, at the rear chain fork 21, and the driven wheel 11 of the transmission mechanism 1 and the rear wheel 4 are driven. After connecting to the wheel 4 for outputting power, the crank pedal 5 is drivingly connected to the driving wheel 10 of the transmission mechanism 1 for inputting power, thereby forming the bicycle structure of this embodiment.

The dead-center bicycle of this embodiment utilizes the transmission mechanism of the present invention. When riding, the pedals 5 are pedaled to input power, and the dead-center position will not appear in the process, which improves the riding experience and optimizes the power input. , which makes riding easier, and the bicycle without a dead point of this embodiment does not need to use a chain, and there will be no defects such as chain drop.

Example 4

The dead-point-free bicycle of this embodiment is further improved on the basis of Embodiment 3. There are two transmission mechanisms 1 , which are respectively arranged on both sides of the frame body 2 .

As shown in Figure 3, the two transmission mechanisms 1 are respectively arranged on the left and right sides of the frame body 2, and cooperate with the two crank pedals 5 to input power at the same time, which is more in line with the design of the human riding action and also improves the power input.

Further, in this embodiment, the driving wheels 10 of the two transmission mechanisms 1 are fixed to the lower tube 22 through the U-shaped frame 23. Specifically, the two driving wheels 10 are symmetrically arranged on both sides of the bottom end of the lower tube 22, and the axes are collinear. , the outer side of the axis of each driving wheel 10 is formed with a shaft body protruding along the axial direction, the shaft body is protruding on the end surface of the driving wheel 10 that is not connected to the connecting rod 12, and the middle of the U-shaped frame 23 is welded and fixed to the lower tube 22 At the bottom end, the two ends of the U-shaped frame 23 are respectively sleeved on the two ends of the shaft body, thereby completing the fixing of the two driving wheels 10 .

Example 5

The dead-point-free bicycle of this embodiment is further improved on the basis of Embodiment 4. A transmission position 101 is axially provided at the axis of the driving wheel 10 of the transmission mechanism 1, and the crank pedal 5 passes through the transmission position 101. Power is input to the driving wheel 10 .

As shown in FIG. 4 , in this embodiment, the position where the driving wheel 10 inputs power is at the axis, and the crank pedal 5 is connected to the transmission position 101 at the axis of the driving wheel 10 in a transmission connection, and then input power to the driving wheel 10 through the pedal make it turn.

More specifically, in this embodiment, the transmission position 101 is a shaft body passing through the shaft center of the driving wheel 10, one end of the shaft body is fixedly connected to the shaft center of the driving wheel 10 through a key, and the other end is also connected to the crank pedal through a key. 5 Fixed connection.

Example 6

The dead-point-free bicycle of this embodiment is further improved on the basis of Embodiment 5, and the driven wheel 11 of the transmission mechanism 1 is a gear;

It also includes a speed regulating mechanism 6 , which is drivingly connected with the driven wheel 11 and the rear wheel 4 for adjusting the transmission ratio of the driven wheel 11 and the rear wheel 4 .

The driven wheel 11 in this embodiment is a gear, and outputs power to the rear wheel 4 through gear transmission.

Further, due to the transmission mechanism 1 adopted in this embodiment, the transmission ratio between the driving wheel 10 and the driven wheel 11 is 1:1. The bicycle only runs one lap, which is more laborious, so the transmission ratio needs to be increased, so the speed regulating mechanism 6 is designed to facilitate the control of the appropriate transmission ratio between the driven wheel 11 and the rear wheel 4 according to the riding needs, which is convenient for riding. .

Example 7

The no-dead-point bicycle of this embodiment is further improved on the basis of Embodiment 6, and the speed regulating mechanism 6 includes:

an idler wheel 60, which is mounted on the chainstay 21, and the idler wheel 60 is engaged with the driven wheel 11;

The pinion gear 61 is in transmission connection with the axle center of the rear wheel 4 , and the pinion gear 61 meshes with the idler gear 60 .

As shown in FIGS. 4 and 5 , the idler gear 60 cooperates with the pinion gear 61 to form the speed regulating mechanism 6 of this embodiment, wherein the gear ratio between the driven gear 11 and the pinion gear 61 is the transmission ratio, and the purpose of designing the idler gear 60 is to adjust The rotation direction is only driven by the pinion 61 meshing with the driven wheel 11, which will make the final rotation direction opposite, that is, the human foot pedals forward but the bicycle runs backward, so the idle wheel 60 needs to be used to change the steering.

Example 8

The dead-center bicycle of this embodiment is further improved on the basis of Embodiment 7, and the pinion 61 is arranged between the driven wheel 11 and the chainstay 21;

The thickness of the idler gear 60 is greater than the sum of the thicknesses of the driven gear 11 and the pinion gear 61 .

As shown in FIG. 6 and FIG. 7 , in this embodiment, the pinion 61 is located between the driven wheel 11 and the chainstay 21 , and the axis of the pinion 11 and the axis of the rear wheel 4 are connected through the shaft drive, and the idler 60 It is arranged behind the driven wheel 11 and meshes with the driven wheel 11 and the pinion 61 at the same time. Through the arrangement of this embodiment, the installation space of the speed regulating mechanism 6 can be effectively saved, thereby reducing the space occupation, and making the bicycle more efficient when manufacturing. flexibility.

Example 9

The no-dead-point bicycle of the present embodiment is further improved on the basis of Embodiment 8, and further includes:

The protective shell 7 is covered on the outside of the driven wheel 11 and the speed regulating mechanism 6 , and the protective shell 7 is fixedly connected with the frame body 2 .

As shown in FIGS. 7 and 8 , in this embodiment, a mounting bracket 24 is vertically welded on the rear end of the chainstay 21 , and the protective shell 7 is covered on the outer side of each gear structure and fixed with the mounting bracket 24 , which can be welded or fixed. It can be detachable and fixed to protect the part of the gear structure, prevent dust and debris, and avoid affecting the gear transmission.

Example 10

This embodiment shows the specific parameter design of a bicycle without a dead point.

In this embodiment, the transmission ratio i=2.5 of the driven wheel 11 and the rear wheel 4 is designed. According to the standard modulus series table stipulated in China, the modulus m=3 is selected. Considering that the power of the bicycle is not large, the driven wheel 11, idler The wheel 60 and the pinion 61 are all quenched and tempered with 45 steel, and the hardness of the tooth surface is 220HBS, 260HBS, 260HBS. It is a closed transmission with a soft tooth surface, the load is stable, and the precision of the primary selection is 7. The number of teeth of the design pinion 61 is Z ₁ = 20. The number of teeth of the idler gear 60 is Z ₂ =20, and the number of teeth of the large gear Z ₃ =i*Z ₂ =2.5×20=50.

Further, for the structural dimensions of the driven wheel 11:

The diameter of the index circle d ₁ =3×50=150mm;

Addendum height h _a1 =h _a ^* m=1×3=3mm (h _a ^* =1);

Root height

Total tooth height h ₁ =h _a1 +h _f1 =3+3.75=6.75mm;

Addendum circle diameter d _a1 =d ₁ +2h _a1 =150+2×3=156mm;

Root circle diameter d _f1 =d ₁ -2h _f1 =150-2×3.75=142.5mm;

pressure angle α ₁ =20°;

Tooth width b ₁ =10 mm.

Structural dimensions for idler 60:

The diameter of the graduation circle d ₂ =3×20=60mm;

Addendum height h _a2 =h _a ^* m=1×3=3mm (h _a ^* =1);

Root height

Total tooth height h ₂ =h _a2 +h _f2 =3+3.75=6.75mm;

Addendum circle diameter d _a2 =d ₂ +2h _a2 =60+2×3=66mm;

Root circle diameter d _f2 =d ₂ -2h _f2 =60-2×3.75=52.5mm;

pressure angle α ₂ =20°;

Tooth width b ₂ =5mm.

Structural dimensions for pinion 61:

The diameter of the index circle d ₃ =3×20=60mm;

Addendum height h _a3 =h _a ^* m=1×3=3mm (h _a ^* =1);

Root height

Total tooth height h ₃ =h _a3 +h _f3 =3+3.75=6.75mm;

Addendum circle diameter d _a3 =d ₃ +2h _a3 =60+2×3=66mm;

Root circle diameter d _f3 =d-2h _f3 =60-2×3.75=52.5mm;

pressure angle α ₃ =20°;

Tooth width b ₃ =5mm.

For the structural dimensions of the driving wheel 10:

Diameter d ₄ =150mm;

Disc thickness b ₄ =5mm.

The rod thickness of the connecting rod 12 is 3 mm.

Further, the axle at the driven wheel 11 is made of 45 steel quenched and tempered, deep groove ball bearings are used, one end of the shafting is fixed in one direction by a flanged bearing cover, the right end of the bearing is positioned and fixed by the shoulder, and the left end of the bearing is fixed by a countersunk head screw. It is fixed with the shaft end retaining ring, and the end of the shaft is screwed into the rear lower fork 21 by thread; more specifically, a deep groove ball bearing with an inner diameter of 10 mm, an outer diameter of 26 mm and a width of 5 mm is selected. The end is threaded into the rear lower fork 21, so there is an undercut, the diameter of the shaft at the undercut is 12mm, the head end of the shaft is fixed by a countersunk head screw and a shaft end retaining ring, and an M3 countersunk head screw is selected; and the bearing The length of the shaft section to be matched should be equal to the width of the bearing, so the shaft section is 5mm. The length of the entire shaft is determined by the width of the rear fork 21, the pinion 61 and the idler 60. The length of the whole shaft is 32mm. The thickness of the chainstay 21 is determined, and the length of the thread section is 12mm, and the axial length of the middle section is 13mm.

Further, the axle at the idler 60 is quenched and tempered with 45 steel, and the deep groove ball bearing of the same type as the driven wheel 11 is used. The thickness of the idler is 20mm, so two deep groove ball bearings need to be added. The sleeve is fixed, and the flange type bearing cover is used to realize the one-way fixing of one end of the shaft system. The right end of one bearing is fixed by the shaft shoulder, the left end of the other bearing is fixed by the countersunk head screw and the shaft end retaining ring, and the end of the shaft is screwed into the back. The lower fork 21; more specifically, the size of the bearing is the same as that of the driven wheel 11; the axial size of the axle at the idler 60 is, the length of the shaft sleeve is 5mm, the shaft section is 15mm, and the length of the entire shaft is determined by the rear lower fork. 21 and the width of the driven wheel 11, the length of the whole shaft is 32mm, the thread length at the end of the shaft depends on the thickness of the chainstay 21, the length of the thread section is 11mm, and the shaft length of the middle section is 4mm.

Further, the axle at pinion 61 is quenched and tempered with 45 steel, the axle at pinion 61 is the axle at 4 of the rear wheel, the left end is symmetrical with the right end, and the left and right ends rely on the A-type ordinary flat key to connect the pinion 61 for rotation. , Both ends of the shaft are positioned by countersunk head screws and shaft end retaining rings. Bearings need to be installed at the connection between the shaft and the rear fork 21. Similarly, deep groove ball bearings of the same type are selected. The pinion 61 and the bearing are positioned by the shaft sleeve. The other end of the bearing is positioned by the shaft shoulder; more specifically, the size of the bearing is the same as that of the driven wheel 11; M3 countersunk head screws are selected for the diameter of the shaft end, the size of the flat key is 3×3, and the key length is 8mm; and The length of the shaft section matched by the bearing should be equal to the sum of the width of the pinion 51, the length of the shaft sleeve and the width of the bearing. , Take the rear wheel 4 tire width as 40mm, the rounded axle length as 97mm, and the intermediate axle length as 63mm.

The remaining structural dimensions of the bicycle refer to the structural dimensions of conventional bicycles, and there is no special design.

Compared with the traditional chain bicycle, the bicycle without dead point in this embodiment is more labor-saving and has a lower failure rate during the riding experience.

The examples described in the present invention are only to describe the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. Deformations and improvements should fall within the protection scope of the present invention.

Claims (10)

1. A transmission mechanism comprises a transmission mechanism body and a transmission mechanism body,

a drive wheel (10) for inputting power;

a driven wheel (11) which is arranged beside the driving wheel (10), is positioned at the same height position with the driving wheel (10) and is used for outputting power;

the connecting rod (12) is respectively in transmission connection with the driving wheel (10) and the driven wheel (11);

the method is characterized in that:

three mounting positions I (100) are uniformly distributed at the edge of the end face of the driving wheel (10);

three mounting positions II (110) are uniformly distributed at positions corresponding to the edge of the end face of the driven wheel (11);

the number of the connecting rods (12) is three, two ends of each connecting rod (12) are respectively rotatably connected with the corresponding mounting position I (100) and the mounting position II (110), and the three connecting rods (12) are parallel to each other.

2. A transmission mechanism as claimed in claim 1, wherein: the driving wheel (10) and the driven wheel (11) are arranged on two different sides of the connecting rod (12).

3. A dead-center-free bicycle, comprising:

a transmission mechanism (1) according to any one of claims 1 to 2;

the transmission mechanism (1) is arranged at a rear lower fork (21) and a lower pipe (22) of the frame main body (2);

a front wheel (3) mounted below the front end of the frame body (2);

the rear wheel (4) is arranged below the rear end of the frame main body (2), and a driven wheel (11) of the transmission mechanism (1) is in transmission connection with the rear wheel (4);

the crank pedal (5) is in transmission connection with a driving wheel (10) of the transmission mechanism (1) and is used for inputting power.

4. A dead-center-free bicycle according to claim 3, wherein: the two transmission mechanisms (1) are respectively arranged on two sides of the frame main body (2).

5. The bicycle of claim 4, wherein: the crank pedal (5) inputs power to the driving wheel (10) through the transmission position (101).

6. The bicycle of claim 5, wherein: the driven wheel (11) of the transmission mechanism (1) is a gear.

7. The bicycle of claim 6, wherein: the speed regulating device also comprises a speed regulating mechanism (6) which is in transmission connection with the driven wheel (11) and the rear wheel (4) and is used for regulating the transmission ratio of the driven wheel (11) and the rear wheel (4).

8. A bicycle without dead spots according to claim 7, characterised in that the governor mechanism (6) comprises:

an idle wheel (60) mounted on the rear lower fork (21), the idle wheel (60) meshing with the driven wheel (11);

and the axis of the pinion (61) is in transmission connection with the axis of the rear wheel (4), and the pinion (61) is meshed with the idle wheel (60).

9. The dead-center-free bicycle according to claim 8, wherein:

the pinion (61) is arranged between the driven wheel (11) and the rear lower fork (21);

the thickness of the idle wheel (60) is larger than the sum of the thicknesses of the driven wheel (11) and the pinion (61).

10. The bicycle of claim 9, further comprising:

and the protective shell (7) is covered on the outer sides of the driven wheel (11) and the speed regulating mechanism (6), and the protective shell (7) is fixedly connected with the frame main body (2).

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