CN113415376A

CN113415376A - Chain transmission

Info

Publication number: CN113415376A
Application number: CN202110899735.2A
Authority: CN
Inventors: 张卫
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-08-06
Filing date: 2021-08-06
Publication date: 2021-09-21

Abstract

A chain transmission. The chain is connected on action wheel and driven round, and the take-up pulley is connected with the chain. The fan-shaped speed change plates are uniformly arranged on the left side of the driving wheel gear ring and are connected with the driving wheel in a left-right insertion mode. The arc edge on the variable-speed plate is arranged to be in a chain rack structure, and the chain racks on each variable-speed plate are located at the outer end of the gear ring on the driving wheel. All be provided with a transmission head on each variable speed board, all seted up on the bottom face of each transmission head and crossed groove, work groove and the right side and crossed the groove. The adjuster is connected on the shaft sleeve of the rotating shaft, and a piston rod in the adjuster corresponds to the bottom end face of each transmission head. When the driving wheel drives the speed change plate and the transmission head to rotate forwards or backwards around the rotating shaft, the piston rod on the adjuster can be matched with the working groove on the transmission head to push the speed change plate to be overlapped with or separated from the driving wheel. The variable speed board overlapped with the driving wheel can change the perimeter of the driving wheel through the mode of adding the chain rack, thereby realizing the adjustment of the chain transmission speed.

Description

Chain transmission

Technical Field

The present invention relates to a bicycle speed changing device, particularly to a chain type speed changer capable of changing the transmission speed of a chain.

Background

At present, the known bicycle speed changing device adopts a multi-piece chain wheel and chain track changing mode to carry out speed changing transmission, so that the traditional chain transmission speed changing device is not only complicated in structure but also inconvenient to maintain and repair.

Disclosure of Invention

In order to overcome the defect that the conventional bicycle speed changing device is complex in structure, the invention provides a chain type speed changer which can adjust the speed of chain transmission in a mode of changing the circumference of a chain wheel, so that the structure is simple and the maintenance is convenient.

The technical scheme adopted by the invention for solving the technical problems is as follows: the invention comprises a driving wheel, a front shaft, a regulator, a pull wire, a lifter, a piston rod, a speed change plate, a socket, a lock groove, a plug, a lock head, a transmission head, a working groove, a left through groove, a right through groove, a driven wheel, a rear shaft, a chain and a tension wheel.

The driving wheel and the driven wheel are respectively connected to a front shaft and a rear shaft which are arranged in parallel front and back, and both the driving wheel and the driven wheel are in a chain wheel structure. The chain is connected on action wheel and driven round, and the take-up pulley is connected with the chain. The speed change plate is of a fan-shaped plate surface structure, and the arc-shaped edge of the speed change plate and the fan-shaped plate surface form a left-upper-right-lower-type step plate structure. The arc-shaped edge of the speed change plate is of an arc-shaped chain tooth rack structure, and the chain teeth on the speed change plate are of the same structure as the chain teeth on the driving wheel and the driven wheel. A plurality of gear change plate sets up in the left side of action wheel and evenly arranges along the sprocket ring of action wheel, and the sprocket on each gear change plate all is located the outer end of action wheel cochain ring gear. Each speed change plate is respectively connected with a plurality of sockets arranged on the driving wheel through cylindrical plugs vertically arranged on the speed change plates, lock heads are arranged on the cylindrical walls of the plugs, and left and right lock grooves matched with the lock heads are formed in inner holes of the sockets. The left end face of each speed changing plate is provided with a rectangular transmission head, and a left through groove, a working groove and a right through groove which penetrate through the front end face and the rear end face of each transmission head are formed in the cylindrical surface of each transmission head corresponding to the axis direction of the driving wheel. The working groove is an inclined groove which runs through the right front end and the left rear end of the transmission head, the left cross groove is an inclined groove which runs through the left rear notch of the working groove from top to bottom and runs through the left front end surface of the transmission head from top to bottom, and the right cross groove is an inclined groove which runs through the right front notch of the working groove from top to bottom and runs through the right rear end surface of the transmission head from top to bottom. The adjuster is connected on the shaft sleeve of the front shaft, the lifter is arranged in the adjuster, and the lifter is a connecting rod crossed telescopic mechanism. The inner end of the piston rod is connected with the lifter in the adjuster, and the outer end of the piston rod points to the rear shaft direction and corresponds to each transmission head. Two ends of the pull wire are respectively connected with the elevator and the variable speed control device on the bicycle.

The speed change plate and the transmission head are driven to rotate forwards around the front shaft by the driving wheel, and the piston rod is driven to extend out of the regulator by the pull wire. When the outer end of the piston rod enters from the notch of the working groove at the front end of the transmission head, the piston rod can be matched with the working groove to push the transmission head and the speed change plate to move rightwards. When the speed change plate is overlapped with the driving wheel and is positioned by matching the lock head and the lock groove, the chain rack on the speed change plate and the chain gear ring on the driving wheel are positioned on the same plane. When the driving wheel continues to rotate, the chain teeth on the speed change plate can be meshed with the chain. By overlapping the gear shift plate with the drive wheel, the circumference of the drive wheel can be changed and thus acceleration can be achieved. Through action wheel drive gear shift board and transmission head around preceding axial rotation backward, when the piston rod on the regulator entered from the left rear end notch of the last work groove of transmission head, the piston rod can cooperate the work groove to order about each gear shift board and action wheel separation respectively and consequently realize slowing down.

The driving wheel is rotated forwards, and when the piston rod meets a speed change plate overlapped with the driving wheel, the piston rod enters from a front end notch of the left through groove on the transmission head and directly slides out after avoiding the working groove. The driving wheel is rotated backwards, and when the piston rod meets a speed change plate separated from the driving wheel, the piston rod enters from a rear end notch of the right passing groove on the transmission head and directly slides out after avoiding the working groove. After the speed change is completed, the piston rod can be retracted through the regulator.

The invention has the advantages that the speed of chain transmission is adjusted by changing the circumference of the chain wheel, so the structure is simple and the maintenance is convenient.

Drawings

The invention is further illustrated with reference to the following figures and examples.

Fig. 1 is a front view of the present invention.

Fig. 2 is a rear view of fig. 1.

Fig. 3 is a schematic structural view of fig. 1 at the time of shifting.

Fig. 4 is an enlarged view of section a-a of fig. 1.

Fig. 5 is a schematic view of the structure of fig. 4 during shifting.

Fig. 6 is a schematic structural view of fig. 5 when shifting is completed.

Fig. 7 is an enlarged view of a section B-B of fig. 6.

Fig. 8 is an enlarged cross-sectional view of C-C of fig. 6.

Fig. 9 is an enlarged view of the section D-D of fig. 6.

In the figure: 1. a driving wheel. 2. A shift plate. 3. A drive head. 4. And a chain. 5. A driven wheel. 6. A rear axle. 7. A tension wheel. 8. A regulator. 9. A front axle. 10. A socket is provided. 11. An elevator. 12. And (4) locking the groove. 13. And (4) a plug. 14. And pulling a wire. 15. A piston rod. 16. A lock head. 17. And (7) a working groove. 18. And (4) passing through the groove at the right side. 19. And (4) passing through the groove at the left side.

Detailed Description

In fig. 1, 2, 4, 7, 8 and 9, the driving pulley 1 and the driven pulley 5 are respectively connected to a front shaft 9 and a rear shaft 6 which are arranged in parallel in the front and rear direction, and both the driving pulley 1 and the driven pulley 5 are in a sprocket structure. The chain 4 is connected with the driving wheel 1 and the driven wheel 5, and the tension wheel 7 is connected with the chain 4. The speed change plate 2 is a fan-shaped plate surface structure, and the arc-shaped edge of the speed change plate 2 and the fan-shaped plate surface form a left-upper-right-lower-type step plate structure. The arc-shaped edge of the speed change plate 2 is of an arc-shaped chain tooth rack structure, and the chain teeth on the speed change plate 2 are the same as those on the driving wheel 1 and the driven wheel 5. A plurality of gear change plate 2 sets up in the left side of action wheel 1 and evenly arranges along the sprocket ring of action wheel 1, and the sprocket on each gear change plate 2 all is located the outer end of action wheel 1 cochain ring gear. Each speed change plate 2 is respectively connected with a plurality of sockets 10 arranged on the driving wheel 1 through cylindrical plugs 13 vertically arranged on the speed change plates 2, lock heads 16 are arranged on the cylindrical walls of the plugs 13, and a left locking groove and a right locking groove 12 matched with the lock heads 16 are arranged in inner holes of the sockets 10. A rectangular transmission head 3 is arranged on the left end face of each speed changing plate 2, and a left through groove 19, a working groove 17 and a right through groove 18 which penetrate through the front end face and the rear end face of each transmission head 3 are formed in the cylindrical surface of each transmission head 3 corresponding to the axis direction of the driving wheel 1. The working groove 17 is an inclined groove which runs through the right front end and the left rear end of the transmission head 3, the left passing groove 19 is an inclined groove which runs through the left rear notch of the working groove 17 and runs through the left front end surface of the transmission head 3 from top to bottom, and the right passing groove 18 is an inclined groove which runs through the right front notch of the working groove 17 and runs through the right rear end surface of the transmission head 3 from top to bottom. The adjuster 8 is connected on the shaft sleeve of the front shaft 9, the lifter 11 is arranged in the adjuster 8, and the lifter 11 is a connecting rod crossed telescopic mechanism. The inner end of the piston rod 15 is connected to the lifter 11 in the adjuster 8, and the outer end of the piston rod 15 points in the direction of the rear axle 6 and corresponds to each drive head 3. The two ends of the cable 14 are connected to the lift 11 and a shift operating device on the bicycle, respectively.

In fig. 1, 3, 4, 5, 6 and 7, the gear shift plate 2 and the transmission head 3 are driven by the driving pulley 1 to rotate forward around the front shaft 9, and the piston rod 15 is driven by the pull wire 14 to extend out of the adjuster 8. When the outer end of the piston rod 15 enters from the notch of the working groove 17 at the front end of the transmission head 3, the piston rod 15 can be matched with the working groove 17 to push the transmission head 3 and the speed changing plate 2 to move rightwards. When the speed change plate 2 is overlapped with the driving wheel 1 and is positioned by the lock head 16 and the lock groove 12, the chain rack on the speed change plate 2 and the chain ring gear on the driving wheel 1 are positioned on the same plane. When the driving wheel 1 continues to rotate, the chain rack on the speed change plate 2 can be meshed with the chain 4. By overlapping the gear change plate 2 with the drive wheel 1, the circumference of the drive wheel 1 can be changed and thus acceleration can be achieved. The speed change plates 2 and the transmission head 3 are driven by the driving wheel 1 to rotate backwards around the front shaft 9, when a piston rod 15 on the adjuster 8 enters from a groove opening at the left rear end of a working groove 17 on the transmission head 3, the piston rod 15 can be matched with the working groove 17 to respectively drive each speed change plate 2 to be separated from the driving wheel 1, and therefore speed reduction is achieved.

In fig. 4, 5, 6, 7, 8 and 9, when the driving wheel 1 is rotated forward, the piston rod 15 will enter from the front end notch of the left through groove 19 on the transmission head 3 and slide out directly after avoiding the working groove 17 when the piston rod 15 meets the speed changing plate 2 overlapped with the driving wheel 1. The driving wheel 1 is rotated backwards, when the piston rod 15 meets the speed changing plate 2 separated from the driving wheel 1, the piston rod 15 enters from the rear end notch of the right through groove 18 on the transmission head 3 and directly slides out after avoiding the working groove 17. After the gear change is completed, the piston rod 15 is retracted by the adjuster 8.

Claims

1. The utility model provides a chain derailleur, it includes action wheel, follows driving wheel, front axle, rear axle, chain, variable speed board, transmission head, work groove, left cross groove, right cross groove, regulator, lift, piston rod, act as go-between and take-up pulley, characterized by: the transmission mechanism comprises a driving wheel and a driven wheel which are respectively connected to a front shaft and a rear shaft which are arranged in parallel, a chain is connected to the driving wheel and the driven wheel, a tensioning wheel is connected to the chain, the speed change plates are of a fan-shaped plate structure, arc-shaped edges of the speed change plates are of arc-shaped chain tooth bar structures, a plurality of speed change plates are arranged on the left side of the driving wheel and are evenly distributed along chain tooth rings of the driving wheel, chain teeth bars on the speed change plates are located at the outer ends of chain tooth rings of the driving wheel, the speed change plates are respectively connected with a plurality of sockets arranged on the driving wheel through cylindrical plugs vertically arranged on the speed change plates, locking heads are arranged on column walls of the plugs, two locking grooves which are matched with the locking heads are arranged in the inner holes of the sockets, a rectangular transmission head is arranged on the left end face of each speed change plate, a left through groove which penetrates through the front end face and the rear end face of the transmission head is arranged on the column face of each transmission head corresponding to the axis direction of the driving wheel, The working groove and the right through groove, the regulator is connected on the shaft sleeve of the front shaft, the lifter is arranged in the regulator, the inner end of the piston rod is connected with the lifter in the regulator, the outer end of the piston rod points to the direction of the rear shaft and corresponds to each transmission head, and two ends of the pull wire are respectively connected with the lifter and a variable speed control device on the bicycle.

2. The chain transmission of claim 1, wherein: the driving wheel and the driven wheel are both in a chain wheel structure.

3. The chain transmission of claim 1, wherein: the arc-shaped edge of the speed change plate and the fan-shaped plate surface form a left-upper-right-lower-type stepped plate structure.

4. The chain transmission of claim 1, wherein: the sprocket on the speed change plate has the same structure as the sprocket on the driving wheel and the driven wheel.

5. The chain transmission of claim 1, wherein: the working groove is an inclined groove which penetrates through the right front end and the left rear end of the transmission head.

6. The chain transmission of claim 1, wherein: the left through groove is an inclined groove which passes through the left rear notch of the working groove and penetrates through the left front end face of the transmission head from top to bottom.

7. The chain transmission of claim 1, wherein: the right through groove is an inclined groove which passes through a right front notch of the working groove and penetrates through the right rear end face of the transmission head from top to bottom.

8. The chain transmission of claim 1, wherein: the lifter is a telescopic mechanism with crossed connecting rods.

9. The chain transmission of claim 1, wherein: when the speed changing plate is overlapped with the driving wheel, the chain rack on the speed changing plate and the chain gear ring on the driving wheel are positioned on the same plane.