CN208198722U - Power-saving gear structure for bicycle - Google Patents

Abstract

The utility model provides a labor-saving gear structure for a bicycle, including a driving gear set and a driven gear set, including first and second driving gears and first and second driven gears respectively, wherein a slider is placed in the second driven gear, the first driven gear includes an eccentric shaft and is fixed to the slider; the second driving gear meshes with the second driven gear. When the second driven gear is driven by a pedal of a bicycle through the second driving gear, the slider drives the first driven gear to rotate with the eccentric shaft as the axis, and then drives the first driving gear. A sprocket is attached to the first driving gear, and the slider moves to drive the first driven gear with an eccentric shaft to adjust the rotation angle of the sprocket when the pedal is at different heights, so as to achieve the labor-saving purpose of less forward movement but less force.

Description

Bicycle labor-saving gear structure

technical field

The utility model relates to a gear set, in particular to a labor-saving gear structure applied to bicycles.

Background technique

Bicycle is a leisure and transportation tool commonly used by modern people. It not only reduces exhaust emissions, achieves the effect of energy saving and carbon reduction, but also has the effect of leisure, entertainment and stress relief. It is an economical and practical transportation and leisure tool.

A general bicycle includes a sprocket pedal set between the front wheel and the rear wheel, a flywheel set on one side of the rear wheel, and a chain belt connected between the sprocket pedal set and the flywheel set. When stepping on the pedal of the chain wheel pedal group, the flywheel group can be driven to rotate through the transmission of the chain belt, so that the rear wheel rotates, and at the same time, the front wheel is prompted to rotate accordingly, so as to achieve the effect of advancing. But when the pedal is at the highest point and the lowest point, since the force arm is 0, the rider cannot apply force, and there must be an angle to step on the pedal. The larger the angle, the less effort, because the force arm is also larger. When the force arm is 1 in the horizontal position, it is the easiest to step on, and then gradually requires more force to step on the pedal. If the force in the horizontal position is 1 unit, when the pedal is at 15°, the user's force It is 8 units. It can be seen that if you ride for a long time and a long distance, you will inevitably consume a lot of energy.

Therefore, the utility model proposes a bicycle labor-saving gear structure to effectively solve the above-mentioned problems. The specific structure and its implementation will be described in detail below:

Utility model content

The main purpose of this utility model is to provide a bicycle labor-saving gear structure, which adds a group of driven gear sets beside the driving gear set, and uses the eccentric wheel to adjust the rotation angle of the driving gear disc, which can fine-tune the forward distance of the bicycle, so that the pedals can The highest point and the lowest point where the force is most difficult can be shortened by shortening the forward distance but only need to pay a small force to save the rider's physical strength.

Another object of the present utility model is to provide a bicycle labor-saving gear structure, which is provided with a movable slider in the second driven gear of the driven gear set, and the main shaft and eccentric shaft of the first driven gear are both Embedded in the slider, when the second driven gear is driven to rotate by the first driven gear, the rotation angle of the first driving gear is changed due to the action of the slider and the eccentric shaft.

In order to achieve the above purpose, the utility model provides a bicycle labor-saving gear structure, including a driving gear set, including a superimposed first driving gear and a second driving gear, and the second driving gear is replaced by a pedal of a bicycle. drive; a driven gear set, including a first driven gear, a slider and a second driven gear, the first driven gear overlaps with the second driven gear, and the slider is placed on the second driven gear Among the two driven gears, the first driven gear includes an eccentric shaft and is fixed to the slide block; and a gear box includes a connected first accommodation space and a second accommodation space, the first accommodation The space accommodates the driving gear set, the second accommodation space accommodates the driven gear set, and the second driving gear communicates with the first accommodation space and the second accommodation space through a communication port. The second driven gear meshes, the second driving gear drives the second driven gear, the slider drives the first driven gear to rotate around the eccentric shaft, and the first driven gear then drives the The first driving gear.

According to an embodiment of the present utility model, a first protrusion is provided in the middle of the first driving gear, a second protrusion is disposed in the middle of the second driving gear, and the diameter of the second protrusion is smaller than the inner diameter of the first protrusion. Can be embedded in the first protrusion.

Bearing on, a first perforation is provided in the middle of the first protrusion, a second perforation is provided in the middle of the second protruding part, a third perforation is provided in the middle of the first accommodating space of the gear box, and a central axis of the bicycle passing through the first through hole, the second through hole and the third through hole in sequence.

The outer surface of the first protrusion is provided with at least one first screw thread for combining with a chain wheel of the bicycle. The outer surface of the second protrusion is provided with at least one second screw thread for combining with the inner surface of the first protrusion.

According to an embodiment of the present invention, the first driving gear and the second driving gear in the driving gear set have the same diameter. The first driven gear and the second driven gear in the driven gear set have the same diameter.

According to an embodiment of the present invention, the number of teeth of the driving gear set is twice that of the driven gear set.

According to an embodiment of the present invention, the slider is in the shape of a long strip, and the accommodation groove in the second driven gear is also in the shape of a strip, and the width and depth of the accommodation groove are the same as those of the slider. The length of the slot is greater than the length of the slide block for the slide block to move.

According to an embodiment of the present invention, a main shaft is arranged at the center of the first driven gear, and the eccentric shaft is arranged beside the main shaft.

Bearing, the slider is provided with a first shaft hole and a second shaft hole, the main shaft of the first driven gear is snapped into the first shaft hole, and the eccentric shaft is snapped into the second shaft hole. In addition, the center of the second driven gear is provided with a third shaft hole, and the main shaft is inserted into the third shaft hole through the first shaft hole.

On the bearing, the diameters of the main shaft and the eccentric shaft are the same, and the diameter of the first shaft hole is larger than that of the second shaft hole.

According to an embodiment of the utility model, the second driving gear is attached to a sprocket plate of the bicycle, and a set of chain belts is installed on the sprocket plate, and the pedal drives the sprocket plate, the driving gear set, and the driven The gear set and the chain belt rotate the tires of the bicycle.

Description of drawings

Fig. 1 is a schematic diagram of an embodiment of the utility model bicycle labor-saving gear structure applied to the bicycle sprocket disc;

Fig. 2 is a side sectional view of an embodiment of the utility model bicycle labor-saving gear structure applied to the bicycle sprocket disc;

Fig. 3A and Fig. 3B are respectively the exploded views of the labor-saving gear structure of the utility model bicycle from different angles;

Fig. 4A and Fig. 4B are respectively the schematic diagram of an embodiment and the side sectional view of the first driven gear eccentrically rotated by the movement of the slider in the labor-saving gear structure of the bicycle of the present invention;

Fig. 5A is a comparative schematic diagram of the rotation angle of the driven gear set when the axis of the driven gear set of the bicycle labor-saving gear structure of the utility model deviates from the main shaft;

Fig. 5B is a schematic diagram of an embodiment of the application force ratio of the pedal at different heights when the utility model bicycle labor-saving gear structure is applied;

Wherein, each reference sign is: 10, driving gear set; 12, first driving gear; 122, first protrusion; 124, first perforation; 126, first thread; 14, second driving gear; 142, first Two protrusions; 144, second perforation; 146, second thread; 16, gear box; 162, first accommodation space; 164, third perforation; 166, second accommodation space; 20, driven gear set; 22, the first driven gear; 222, the main shaft; 224, the eccentric shaft; 24, the slider; 242, the first shaft hole; 244, the second shaft hole; 26, the second driven gear; 262, the third shaft hole ; 264, accommodating groove; 30, central shaft; 31, sprocket disc; 32, axle rod; 34, pedal; 36, chain belt.

Detailed ways

The utility model provides a bicycle labor-saving gear structure, please refer to Figure 1, which is a schematic diagram of an embodiment of the bicycle labor-saving gear structure of the utility model applied to the bicycle chain wheel disc 31, as shown in the figure, including the bicycle chain wheel disc 31 , central shaft 30, shaft rod 32, pedal 34, chain belt 36 and driving gear set 10 and driven gear set 20 in the bicycle labor-saving gear structure of the present utility model. The central shaft 30 passes through the center of the sprocket disc 31 and the driving gear set 10. The shaft rods 32 are one on the front side and one on the rear side. A pedal 34 is provided at the end for the user to step on and apply force. The chain belt 36 bypasses the sprocket disc 31 And the tire of bicycle (not shown in the figure). In the prior art, when the pedal 34 is stepped on in the forward direction, the driving gear set 10 drives the sprocket disc 31 to rotate, and the chain belt 36 is used to drive the tire to rotate, but the utility model uses the setting of the driven gear set 20, It solves the problem that the pedal 34 is more laborious to step on at certain angles in the past.

Please refer to Fig. 2, Fig. 3A and Fig. 3B at the same time. Fig. 2 is a side sectional view of an embodiment of the utility model bicycle labor-saving gear structure applied to the bicycle sprocket disc, and Fig. 3A and Fig. 3B are respectively the utility model bicycle labor-saving gears An exploded view of the structure viewed from different angles.

The bicycle labor-saving gear structure provided by the utility model includes a driving gear set 10, a driven gear set 20 and a gear plate 16, and the driving gear set 10 includes a first driving gear 12 and a second driving gear stacked together. gear 14, and the second driving gear 14 is driven to rotate by the pedal of the bicycle depending on the sprocket disc. The middle of the first driving gear 12 is provided with a first protrusion 122, and the middle of the second driving gear 14 is provided with a second protrusion 142. The diameter of the second protrusion 142 is smaller than the inner diameter of the first protrusion 122, so the second protrusion 142 Can be embedded in the first protrusion 122 . A first through hole 124 is formed in the middle of the first protrusion 122 , and a second through hole 144 is formed in the middle of the second protrusion 142 for the central axis of the bicycle to pass through. The outer surface of the first convex portion 122 is provided with at least one first thread 126 to combine with the sprocket disc of the bicycle, and the outer surface of the second convex portion 142 is provided with at least one second thread 146 to connect with the first convex portion 122 internal surface bonding.

The driven gear set 20 includes a first driven gear 22, a slider 24 and a second driven gear 26, the first driven gear 22 overlaps with the second driven gear 24, and the slider 24 is elongated , the second driven gear 26 is provided with an accommodating groove 264 for placing the slider 24, which is also elongated, and the width and depth of the accommodating groove 264 are the same as those of the slider 24, and the length of the accommodating groove 264 is longer than that of the slider. The length of block 24 is used for slide block 24 to move; The first driven gear 22 comprises a main shaft 222 and an eccentric shaft 224, and main shaft 222 is located at the circle center of first driven gear 22, and eccentric shaft 224 is then located at main shaft 222 Next to it, and the slider 24 is provided with a first shaft hole 242 and a second shaft hole 244, corresponding to the main shaft 222 and the eccentric shaft 224 of the first driven gear 22 respectively, the main shaft 222 is inserted into the first shaft hole 242, The eccentric shaft 224 is inserted into the second shaft hole 244 to fix the first driven gear 22 and the slider 24 . When the slider 24 moves in the accommodating groove 264 , the first driven gear 22 will also move accordingly. In particular, the diameters of the main shaft 222 and the eccentric shaft 224 are the same, but the diameter of the first shaft hole 242 is larger than that of the second shaft hole 244 , so the main shaft 222 has room to rotate in the first shaft hole 242 . The center of the second driven gear 26 is provided with a third shaft hole 262, and the main shaft 222 passes through the first shaft hole 242 and then snaps into the third shaft hole 262. The diameter of the third shaft hole 262 is also larger than the diameter of the main shaft 222. Therefore, the main shaft 222 also has space for adjusting the offset in the third shaft hole 262 .

The gear box 24 includes a first accommodating space 162 and a second accommodating space 166 connected to each other. The first accommodating space 162 accommodates the driving gear set 10, and the second accommodating space 166 accommodates the driven gear set 20. And the second driving gear 14 meshes with the second driven gear 26 through a communication opening 168 between the first accommodating space 162 and the second accommodating space 166 . A third through hole 164 is defined in the middle of the first accommodating space 162 of the gear box 16 , and the central axis of the bicycle passes through the first through hole 124 , the second through hole 144 and the third through hole 164 in sequence.

The first driving gear 12 and the second driving gear 14 in the driving gear set 10 have the same diameter, and the first driven gear 22 and the second driven gear 26 in the driven gear set 20 have the same diameter, the driving gear set 10 The number of teeth of the driven gear set 20 is greater than the number of teeth of the driven gear set 20, so the number of rotations of the driving gear set 10 is less than that of the driven gear set 20. Twice, so the number of revolutions of the driving gear set 10 is one-half of the number of revolutions of the driven gear set 20

In the utility model, the action of the driving gear set 10 and the driven gear set 20 is as follows: when the pedal of a bicycle is stepped on, it drives the connected second driving gear 14 to rotate, because the second driving gear 14 and the second driven gear The gears 26 are engaged, so the second driven gear 26 is rotated jointly. At this time, the slider 24 in the second driven gear 26 rotates to drive the first driven gear 22, and the first driven gear 22 takes the eccentric shaft 224 as a The axis rotates, but the second driven gear 26 still rotates with the main shaft 222 at the center of circle as the axis, and the first driven gear 22 drives the first driving gear 12 again to drive the sprocket disc and the chain belt of the bicycle.

Fig. 4A and Fig. 4B are respectively the schematic diagram of an embodiment and the side sectional view of the eccentric rotation of the first driven gear driven by the movement of the slider in the labor-saving gear structure of the bicycle of the present invention, and it can be seen that when the second driven gear 26 is at the center of the circle When the main shaft 222 rotates on the axis, the first driven gear 22 will adjust its position left and right due to the offset of the slider 24, and as the second driven gear 26 and the slider 24 rotate, the main shaft 222 will be offset accordingly. As shown in the dotted circle in FIG. 4A , it is the moving track of the first shaft hole 242 accommodating the main shaft 222 in the slider 24 .

Fig. 5A is a comparative schematic diagram of the rotation angle of the driven gear set when the axis of the driven gear set of the bicycle labor-saving gear structure of the utility model deviates from the main shaft, for example, when the pedal position goes clockwise from the highest point (90°) to At 105°, because the first driven gear is an eccentric wheel, the driven gear set will actually deviate horizontally, making the actual rotation angle larger, and so on. Please refer to Figure 5B at the same time, which is a schematic diagram of an embodiment of the force ratio of the pedal at different heights when the utility model bicycle labor-saving gear structure is applied. In the utility model, the first driven gear with an eccentric shaft drives the auxiliary The first driving gear on the sprocket disc is used to fine-tune the rotation angle of the sprocket disc. As shown in the figure, the pedal is at the most labor-saving position at 90°. Assume that the force applied at this time is 1, and the forward distance is 1 unit. Then when the pedal is at 15°, the user’s applied force is 4.16 and can advance 0.24 unit distance; when the pedal is at 30°, the user’s applied force is 2.04 and can advance 2.04 unit distance, and so on, when the pedal position is at At 75°, the user's applied force is 1.03 and can advance 0.97 unit distance. It can be seen that when the pedal is stepped on, the forward angle of the pedal at the highest point is actually greater than the rotation angle of the sprocket disc (the forward distance of the bicycle) , and when the pedal gradually descends from the high point to the horizontal position, the rotation angle of the sprocket disc gradually increases to be greater than the forward angle of the pedal. When the pedal descends from the horizontal position to the lowest point, the rotation angle of the sprocket disc actually Gradually reduce to less than the forward angle of the pedal.

In the experiment, if the driving gear set of the same size is not provided with the driven gear set, no matter which angle the pedal is at, the advancing distance is the same, but compared with the utility model, when the pedal is at 15°, the user The required force is 8. When the pedal is at 30°, the user’s force is 3.6. When the pedal is at 45°, the user’s force is 2.7. When the pedal is at 90°, the user’s force is 1.8. , obviously no matter which angle exerts force all bigger than the utility model.

Therefore, when the bicycle labor-saving gear structure provided by the utility model is at the highest point and the lowest point of the pedal, the rotation distance of the sprocket disc is small (that is, the advancing distance of the bicycle is small) but labor-saving, and the pedal has the largest moment arm when in the horizontal position. , the advancing distance is the largest with the smallest force applied. Therefore, when the user rides the bicycle using the utility model, he will not consume energy due to the high force applied at the highest point, and can ride for a longer distance.

Only the above-mentioned ones are only preferred embodiments of the present utility model, and are not intended to limit the implementation scope of the present utility model. Therefore, all equal changes or modifications based on the features and spirit described in the scope of application of the utility model shall be included in the scope of patent application of the utility model.

Claims (14)

1. A bicycle labor-saving gear structure, characterized in that, comprising: A driving gear set, including a superimposed first driving gear and a second driving gear, and the second driving gear is driven by a pedal of a bicycle; A driven gear set includes a first driven gear, a slider and a second driven gear, the first driven gear overlaps with the second driven gear, and the slider is placed on the second driven gear In the driven gear, the first driven gear includes an eccentric shaft and is fixed with the slider; and A gear box, including a connected first accommodation space and a second accommodation space, the first accommodation space accommodates the driving gear set, the second accommodation space accommodates the driven gear set, and the The second driving gear meshes with the second driven gear through a communication port between the first accommodating space and the second accommodating space, and the second driving gear drives the second driven gear. The block drives the first driven gear to rotate around the eccentric shaft, and the first driven gear drives the first driving gear. 2. The bicycle labor-saving gear structure according to claim 1, wherein a first protrusion is arranged in the middle of the first driving gear, a second protrusion is arranged in the middle of the second driving gear, and the second protrusion The diameter is smaller than the inner diameter of the first protrusion, and can be embedded in the first protrusion. 3. The bicycle labor-saving gear structure as claimed in claim 2, wherein a first through hole is provided in the middle of the first protrusion, a second through hole is provided in the middle of the second protrusion, and the first hole of the gear box is A third through hole is arranged in the middle of the accommodating space, and a central axis of the bicycle passes through the first through hole, the second through hole and the third through hole in sequence. 4 . The bicycle labor-saving gear structure as claimed in claim 2 , wherein at least one first thread is provided on the outer surface of the first protrusion to combine with a sprocket of the bicycle. 5 . 5 . The labor-saving gear structure for a bicycle as claimed in claim 2 , wherein at least one second thread is provided on the outer surface of the second protrusion to combine with the inner surface of the first protrusion. 6 . 6 . The bicycle labor-saving gear structure according to claim 1 , wherein the first driving gear and the second driving gear in the driving gear set have the same diameter. 7. The bicycle labor-saving gear structure according to claim 1, wherein the first driven gear and the second driven gear in the driven gear set have the same diameter. 8. The bicycle labor-saving gear structure according to claim 1, wherein the number of teeth of the driving gear set is twice that of the driven gear set. 9. The bicycle labor-saving gear structure according to claim 1, wherein the slider is elongated, and a receiving groove in the second driven gear is also elongated, and the accommodating groove The width and depth of the accommodating groove are the same as those of the slider, and the length of the accommodating groove is greater than that of the slider for the slider to move. 10. The bicycle labor-saving gear structure according to claim 1, wherein a main shaft is arranged at the center of the first driven gear, and the eccentric shaft is arranged beside the main shaft. 11. The bicycle labor-saving gear structure according to claim 10, wherein the slider is provided with a first shaft hole and a second shaft hole, and the main shaft of the first driven gear is snapped into the first shaft In the hole, the eccentric shaft snaps into the second shaft hole. 12 . The bicycle labor-saving gear structure according to claim 11 , wherein the main shaft and the eccentric shaft have the same diameter, and the first shaft hole has a larger diameter than the second shaft hole. 13 . 13. The bicycle labor-saving gear structure according to claim 11, wherein a third shaft hole is provided at the center of the second driven gear, and the main shaft passes through the first shaft hole and snaps into the third shaft hole middle. 14. The bicycle labor-saving gear structure according to claim 1, wherein the second driving gear is attached to a sprocket plate of the bicycle, and a group of chain belts are installed on the sprocket plate, and the pedal drives the The sprocket disc, the driving gear set, the driven gear set and the chain belt make the tires of the bicycle rotate.