Reciprocating type crank gear speed change structure and bicycle thereof

Abstract

The utility model belongs to the field of pedal bicycles, and particularly discloses a reciprocating type crank gear speed change structure and a bicycle thereof, the reciprocating type crank gear speed change structure comprises a gear transmission, a speed change operation device and a reciprocating type crank mechanism, the gear transmission adopts gear speed change, the speed change amplitude is large, speed change is fast and reliable, and the transmission is small and built-in; the bicycle is not prone to being damaged, the appearance of the bicycle is more concise and attractive, the acting efficiency of the crank on the main shaft is improved to 85% or above by controlling the reciprocating circumferential angle of the crank, and the length of the crank can be greatly increased to obtain larger torque under the condition that the standard requirement for the toe distance between pedals and the rim of a front wheel of the bicycle is met. And the mechanical property of bicycle sports is greatly improved in a breakthrough manner.

Description

Technical Field

[0001] The utility model belongs to the field of pedal bicycles, and particularly discloses a reciprocating crank gear speed change structure and a bicycle thereof. Background Art

[0002] Most existing bicycles use a crank mechanism for circular motion and a toothed disc for speed change. When the crank makes a circular motion, the average work efficiency of the crank on the central axis can only reach 50%, which is inefficient. At the same time, the crank length is also strictly limited. After switching to a reciprocating crank mechanism, although the work efficiency of the crank on the central axis can be greatly improved and the crank length can be greatly increased to obtain greater torque, the circular angle of rotation of the central axis in each reciprocating process is greatly reduced, and the speed of the vehicle is reduced accordingly. If the toothed disc is still used for speed change, the toothed disc diameter must be increased. However, if the toothed disc diameter is too large, it does not meet the actual market and product needs. Summary of the Invention

[0003] In order to solve the problems in the background technology, the utility model discloses a reciprocating crank gear speed change structure. By controlling the reciprocating circular angle of the crank, the work efficiency of the crank on the main shaft is increased to more than 85%. While meeting the standard requirements for the toe spacing between the pedals and the front wheel rim of the bicycle, the crank length can be greatly increased to obtain greater torque, thereby achieving a breakthrough improvement in the mechanical performance of the bicycle.

[0004] To achieve the above-mentioned purpose, the reciprocating crank gear speed change structure of the present invention adopts the following technical solutions:

[0005] A reciprocating crank gear speed change structure includes a gear transmission, a speed change operating device and a reciprocating crank mechanism.

[0006] The gear transmission includes a gearbox and a main shaft, a countershaft and an output shaft arranged in parallel and at intervals in the gearbox, wherein both ends of the main shaft, countershaft and output shaft are rotatably connected to the gearbox respectively, the main shaft and output shaft are respectively provided with splines, and sliding sleeves with splines are respectively slidably connected to the main shaft and output shaft, and gears corresponding to the sliding sleeves are respectively provided on both sides of the sliding sleeves, and the gears are movably sleeved on the main shaft or the output shaft, and the sliding sleeves can be plugged with the corresponding gears when they move to the end position along the axial direction of the main shaft or the output shaft, and two driven gears and two transition gears are inherently sleeved on the countershaft at intervals, the driven gear is meshed with the gear sleeved on the main shaft, and the transition gear is meshed with the gear sleeved on the output shaft;

[0007] The speed shift operating device includes a speed shift dial card that is connected to the sliding sleeve. A handle is provided in the middle of the speed shift dial card. The end of the handle extends through the gear box to the outside of the gear box. The end of the handle can be pushed and pulled to drive the corresponding sliding sleeve to slide along the axial direction of the shaft on which it is located through the speed shift dial card.

[0008] The reciprocating crank mechanism includes left and right cranks, one end of the left and right cranks are respectively connected to the two ends of the main shaft through a one-way bearing, and the other ends of the left and right cranks are respectively connected to the two ends of the traction rope wound around the fixed pulleys above the left and right cranks. The left and right cranks are pulled together by the traction rope. Under the action of external force, the left and right cranks can perform reciprocating motion through the action of the one-way bearing and drive the main shaft to rotate relative to the gear box.

[0009] Furthermore, the reciprocating crank gear speed change structure also includes a crank limiting device, which includes a stop rod arranged at the lower front of the gear box and a pin arranged at the rear ends of the left and right cranks. The stop rod and the pin jointly limit the rotation range of the left and right cranks.

[0010] Furthermore, the reciprocating crank gear speed change structure is provided with protruding columns at both ends of the sliding sleeve, and a sliding groove is provided in the middle of the sliding sleeve. The speed shift card is semi-circular, and a pin column is provided on the inner side of both ends of the speed shift card along the chord direction. The pin column is stuck in the sliding groove of the corresponding sliding sleeve.

[0011] Furthermore, the reciprocating crank gear speed change structure is slidably connected to the main shaft with a first sleeve, a sliding groove is provided in the middle of the first sleeve, and driving gears are respectively provided on both sides of the first sleeve. The driving gears are movably sleeved on the main shaft, and column holes matching the protruding columns are respectively provided on the end faces of the driving gears facing the first sleeve.

[0012] Furthermore, the reciprocating crank gear speed change structure has a second sleeve slidably connected to the output shaft, a slide groove is provided in the middle of the second sleeve, and output gears are respectively provided on both sides of the second sleeve. The output gears are respectively movably sleeved on the output shaft, and column holes matching the protruding columns are respectively provided on the end faces facing the second sleeve from the output gear.

[0013] Furthermore, in the reciprocating crank gear speed change structure, the end of the shift handle is connected to one end of the traction line, and the other end of the traction line is connected to the finger shifter arranged on the handlebar.

[0014] On the other hand, the utility model discloses a bicycle, comprising the above-mentioned reciprocating crank gear speed change structure, wherein the gear box is arranged at the intersection of the front oblique beam, the seat tube and the rear flat beam, and the gear box is welded to the front oblique beam, the seat tube and the rear flat beam.

[0015] Furthermore, the bicycle is provided with a sprocket at the output end of the output shaft, and the sprocket is connected to the flywheel at the rear of the bicycle through a chain transmission.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. The reciprocating crank gear transmission structure of the utility model adopts a reciprocating crank. By controlling the reciprocating angle of the crank, the work efficiency of the crank on the main shaft can be increased to more than 85%. It can also significantly increase the crank length to obtain greater torque while meeting the standard requirements for the distance between the toe of the pedal and the wheel edge of the bicycle front wheel, thereby achieving a breakthrough improvement in the mechanical performance of the bicycle.

[0018] 2. The reciprocating crank gear speed change structure of the utility model adopts gear speed change, which has a large speed change range, fast and reliable speed change; the transmission is compact and built-in, not easy to be damaged, and the appearance of the bicycle is more simple and beautiful;

[0019] 3. The reciprocating crank gear speed change structure of the utility model, its speed change operation mode and speed change operation device can also replace the speed change operation mode and speed change operation device of the existing motorcycle gear transmission, forming a new manual motorcycle gear transmission, making the structure of the motorcycle gear transmission simpler and more sophisticated. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the internal structure of the gear transmission in the present invention;

[0021] Figure 2 yes Figure 1 AA cross-sectional structural diagram in;

[0022] Figure 3 It is a structural diagram of the reciprocating crank mechanism in the utility model;

[0023] Figure 4 It is a structural diagram of the crank limiting device in the utility model;

[0024] In the above figure: 1-main shaft; 2a-first driving gear; 2b-second driving gear; 3-first sliding sleeve; 4-countershaft; 5-driven gear; 6-transition gear; 7-output shaft; 8-second sliding sleeve; 9a-first output gear; 9b-second output gear; 10-end cover; 11-gearbox; 12-speed shifting card; 13-rear flat beam; 14-vertical pipe; 15-front oblique beam; 16-shift handle; 17-sleeve; 18-one-way bearing; 19-crank; 20-traction rope; 21-fixed pulley; 22-stop lever; 23-pin. DETAILED DESCRIPTION

[0025] In order to better understand the present invention, the content of the present invention is further explained below in conjunction with the embodiments, but the content of the present invention is not limited to the following embodiments.

[0026] Combined with attachment Figure 1-4 , the utility model is described in detail, a reciprocating crank gear speed change structure, including a gear transmission, a speed change operating device and a reciprocating crank mechanism,

[0027] The gear transmission includes a gearbox 11 and a main shaft 1, a countershaft 4 and an output shaft 7 arranged in parallel and spaced apart in the gearbox 11. End covers 10 are provided at both ends of the gearbox 11. Bushings 17 adapted to the main shaft 1, the countershaft 4 and the output shaft 7 are provided on the end covers 10. One-way bearings 18 are respectively provided on the bushings 17 at the left and right ends of the main shaft 1. The one-way bearings 18 at both ends are respectively connected to the left and right cranks 19. The main shaft 1, the countershaft 4 and the output shaft 7 are placed in the gearbox 11. The main shaft 1, the countershaft 4 and the output shaft 7 are supported by bearings provided on the end covers 10. The main shaft 1, the countershaft 4 and the output shaft 7 are respectively connected to the gearbox 11 at both ends. The main shaft 1 and the output shaft 7 are respectively provided with bearings. Spline, a sliding sleeve with a spline is slidably connected on the main shaft 1 and the output shaft 7, and gears corresponding to the sliding sleeve are provided on both sides of the sliding sleeve. The gears are movably sleeved on the main shaft 1 or the output shaft 7, and the sliding sleeve can be plugged into the corresponding gear when it moves to the end position along the axial direction of the main shaft 1 or the output shaft 7. Two driven gears 5 and two transition gears 6 are sleeved on the countershaft 4 at intervals. The two driven gears 5 are respectively meshed with the two driving gears sleeved on the main shaft 1 to form two pairs of teeth. The two transition gears 6 are meshed with the two output gears sleeved on the output shaft 7 to form two pairs of teeth, which are used to adjust the transmission ratio, transition the output shaft steering, and output power;

[0028] The gear shift operating device includes a gear shift dial 12 connected to the sliding sleeve, and a shift handle 16 is provided in the middle of the gear shift dial 12. A shaft tube is provided at a position corresponding to the shift handle 16 on the gear box 11. The end of the shift handle 16 passes through the shaft tube and extends to the outside of the gear box. The end of the shift handle 16 can be rotated to move the corresponding sliding sleeve along the axial direction of the shaft on which it is located through the gear shift dial 12; when working, the end of the shift handle 16 is rotated left and right, and the shift handle 16 drives the gear shift dial 12 to swing left and right, thereby moving the corresponding sliding sleeve left and right along the axial direction of the shaft on which it is located, so that the protruding column on one side of the sliding sleeve is inserted into the column hole on the driving gear or output gear on the same side, so that the gear pair associated with the sliding sleeve drives the countershaft 4 and the output shaft 7 to rotate together with the main shaft 1, and the gear pair associated with the gear on the other side of the sliding sleeve is idle, and vice versa, thereby achieving the purpose of speed shifting. Different gear pairs can be combined with each other to form four vehicle speeds: 1st gear, 2nd gear, 3rd gear, and 4th gear, and a neutral gear is provided for reverse driving;

[0029] The reciprocating crank mechanism includes left and right cranks 19, one end of the left and right cranks 19 is connected to the two ends of the main shaft 1 through a one-way bearing 18, and the other ends of the left and right cranks 19 are connected to the two ends of the traction rope 20 wound around the fixed pulley 21 above the left and right cranks 19. Under the action of the pedaling force, the left and right cranks 19 are pulled by the traction rope 20. Through the action of the one-way bearing 18, they perform reciprocating motion and drive the main shaft 1 to rotate relative to the gear box 11.

[0030] As an optional design, the reciprocating crank gear speed change structure is preferably further provided with a crank limit device, which includes a stop rod 22 arranged at the lower front of the gear box 11 and a pin 23 arranged at the rear end of the left and right cranks 19. The stop rod 22 limits the lower limit position of the forward rotation of the left and right cranks 19 to prevent the traction rope 20 from breaking or falling off, causing the pedals to touch the ground and causing a riding accident. When the pin 23 limits the upper limit position of the reversal of the left and right cranks 19, when the left and right cranks 19 reverse to the set upper limit position, they are blocked by the pin 23 to prevent excessive crank reversal from affecting riding.

[0031] As an optional design, the reciprocating crank gear speed change structure is preferably provided with protruding columns at both ends of the first sleeve 3 and the second sleeve 8, and sliding grooves are respectively provided in the middle of the first sleeve 3 and the second sleeve 8. The speed shift card 12 is semicircular, and pin columns are respectively provided on the inner side of both ends of the speed shift card 12 along the chord direction, and the pin columns are stuck in the sliding grooves of the corresponding sleeves.

[0032] As an optional design, the reciprocating crank gear speed change structure is preferably provided, wherein a first sleeve 3 is slidably connected to the main shaft 1, and driving gears are respectively provided on both sides of the first sleeve 3, and the driving gears include a first driving gear 2a and a second driving gear 2b, which are respectively movably sleeved on the main shaft 1, and column holes matching the bosses are respectively provided on the end surfaces of the first driving gear 2a and the second driving gear 2b facing the first sleeve 3. When the first sleeve 3 is plugged into the first driving gear 2a, the main shaft 1 rotates, and the first driving gear 2a and the slave gear meshing with the first driving gear 2a are connected. The driven gear 5 drives the countershaft 4 to rotate, and the rotation of the countershaft 4 drives the transition gear 6 to rotate. After the transition gear 6 rotates, it drives the output gear meshed with it to rotate. After the output gear rotates, it drives the output shaft to rotate 7 through the second sliding sleeve 8 plugged therein. When the first sliding sleeve 3 is plugged into the second driving gear 2b, the main shaft 1 rotates and drives the countershaft 4 to rotate through the second driving gear 2b and the driven gear 5 meshed with the second driving gear 2b. The rotation of the countershaft 4 drives the transition gear 6 to rotate. After the transition gear 6 rotates, it drives the output gear meshed with it to rotate. After the output gear rotates, it drives the output shaft to rotate 7 through the second sliding sleeve 8 plugged therein.

[0033] As an optional design, the reciprocating crank gear speed change structure is preferred, and a second sleeve 8 is slidingly connected to the output shaft 7, and output gears are respectively provided on both sides of the second sleeve 8. The output gears include a first output gear 9a and a second output gear 9b, and the first output gear 9a and the second output gear 9b are respectively movably sleeved on the output shaft 7, and column holes matching the bosses are respectively provided on the end surfaces of the first output gear 9a and the second output gear 9b facing the second sleeve 8.

[0034] As an optional design, the reciprocating crank gear speed change structure is preferred, and the end of the shift handle 16 is connected to one end of the traction line, and the other end of the traction line is connected to the finger shift set on the handlebar (the traction line and the finger shift are not shown in the accompanying drawings). When adjusting the gear position, the finger shift is wavered, and the finger shift drives the speed shift card 12 to swing left and right through the traction line and the shift handle 16 in turn, and then the corresponding sliding sleeve slides axially along the axis on which it is located to adjust the gear position.

[0035] A bicycle includes the above-mentioned reciprocating crank gear transmission structure, wherein a gear box 11 replaces the bottom bracket of the current bicycle frame and is welded to the intersection of the front oblique beam 15, the seat tube 14 and the rear flat beam 13 of the frame to form a frame structure of the present invention.

[0036] As an optional design, the bicycle is preferably provided with a sprocket at the output end of the output shaft 7, and the sprocket is connected to the flywheel at the rear of the bicycle through a chain drive (the sprocket and flywheel are not shown in the drawings) to transmit power.

[0037] The working process of this utility model is as follows:

[0038] When working, the user moves the shifter on the handlebar to set the gear, rides on the saddle, and pedals. The left and right cranks 19 pull each other and make reciprocating motion through the action of the one-way bearing, driving the main shaft 1 to rotate, and the main shaft 1 drives the output shaft 7 to rotate. The sprocket on the output shaft 7 drives the flywheel at the rear of the bicycle to rotate, thereby driving the bicycle forward. The gear can be changed at any time during riding.

[0039] The above description is only an application implementation method of the present utility model, but the protection scope of the present utility model is not limited to this, and the scope of rights of the present utility model cannot be limited by this. Any equivalent changes made according to the technical solution of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A reciprocating crank gear speed change structure, characterized by: Including gear transmission, speed change operating device and reciprocating crank mechanism, The gear transmission includes a gearbox and a main shaft, a countershaft and an output shaft arranged in parallel and at intervals in the gearbox, wherein both ends of the main shaft, countershaft and output shaft are rotatably connected to the gearbox respectively, the main shaft and output shaft are respectively provided with splines, the main shaft and output shaft are respectively provided with splines, and sliding sleeves with splines are respectively slidably connected to the main shaft and output shaft, and gears corresponding to the sliding sleeves are respectively provided on both sides of the sliding sleeves, and the gears are movably sleeved on the main shaft or the output shaft, and the sliding sleeves can be plugged with the corresponding gears when they move to the end position along the axial direction of the main shaft or the output shaft, and two driven gears and two transition gears are inherently sleeved on the countershaft at intervals, the driven gear is meshed with the gear sleeved on the main shaft, and the transition gear is meshed with the gear sleeved on the output shaft; The speed shift operating device includes a speed shift dial card that is connected to the sliding sleeve. A handle is provided in the middle of the speed shift dial card. The end of the handle extends through the gear box and extends out of the gear box. The end of the handle can be pushed and pulled to move the corresponding sliding sleeve along the axial direction of the shaft on which it is located through the speed shift dial card. The reciprocating crank mechanism includes left and right cranks, one end of the left and right cranks are respectively connected to the two ends of the main shaft through a one-way bearing, and the other ends of the left and right cranks are respectively connected to the two ends of the traction rope wound around the fixed pulleys above the left and right cranks. The left and right cranks are pulled together by the traction rope. Under the action of external force, the left and right cranks can perform reciprocating motion through the action of the one-way bearing and drive the main shaft to rotate relative to the gear box.

2. The reciprocating crank gear speed change structure according to claim 1, wherein: It also includes a crank limiting device, which includes a blocking rod arranged at the lower front of the gear box and a pin arranged at the rear ends of the left and right cranks. The blocking rod and the pin jointly limit the rotation range of the left and right cranks.

3. The reciprocating crank gear speed change structure according to claim 1 or 2, characterized in that: There are respectively provided convex columns at both ends of the sliding sleeve, and respectively provided sliding grooves in the middle of the sliding sleeve. The speed shift card is semicircular, and a latch column is respectively provided on the inner side of both ends of the speed shift card along the chord direction, and the latch column is clamped in the sliding groove of the corresponding sliding sleeve.

4. The reciprocating crank gear speed change structure according to claim 3, wherein: A first sleeve is slidably connected to the main shaft, a slide groove is provided in the middle of the first sleeve, and driving gears are respectively provided on both sides of the first sleeve. The driving gears are movably sleeved on the main shaft, and column holes matching the protruding columns are respectively provided on the end surfaces of the driving gears facing the first sleeve.

5. The reciprocating crank gear speed change structure according to claim 3, wherein: The output shaft is slidably connected to a second sleeve, a sliding groove is provided in the middle of the second sleeve, and output gears are respectively provided on both sides of the second sleeve. The output gears are movably sleeved on the output shaft, and column holes matching the bosses are respectively provided on the end surfaces of the output gears facing the second sleeve.

6. The reciprocating crank gear speed change structure according to claim 3, wherein: The end of the shift handle is connected to one end of a traction line, and the other end of the traction line is connected to a finger shift arranged on the handlebar.

7. A bicycle characterized by: It comprises the reciprocating crank gear speed change structure according to any one of claims 1 to 6, wherein the gear box is arranged at the intersection of the front oblique beam, the vertical pipe and the rear flat beam, and the gear box is welded to the front oblique beam, the vertical pipe and the rear flat beam.

8. A bicycle according to claim 7, characterized in that: A sprocket is provided at the output end of the output shaft, and the sprocket is connected to a flywheel at the rear of the bicycle through a chain transmission.

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