Automatic downgrade and speed-changing transmission bicycle

Abstract

The present invention discloses an automatic downgrade and variable speed transmission bicycle, comprising a bicycle frame, a middle shaft is installed on the bicycle frame, a middle shaft sprocket group is installed on the middle shaft, and the middle shaft sprocket group is composed of three chain discs of different sizes; a tower base is provided on the rear axle of the bicycle, a sun gear is fixedly installed on the tower base, a planetary frame is provided on one side of the sun gear, and a planetary twin gear is installed in the planetary frame. The present invention is easy to start, can run at high speed, has various functions, and is reliable in operation; it is easy to maintain; it is low in cost; it is energy-saving and environmentally friendly, has a good market prospect, and brings great convenience to cyclists. The present invention combines the characteristics of the primary and secondary transmission devices, and solves the problem that the bicycle can be easily started and climbed uphill, and can be ridden at high speed. The secondary transmission state can be automatically converted to the primary transmission state when the riding slows down or stops, so as to ensure that the bicycle has a better riding experience.

Description

Technical Field

[0001] The invention relates to the technical field of bicycles, in particular to an automatic downgrade and speed-changing transmission bicycle. Background Art

[0002] The transmission system of a bicycle is a very critical part of the bicycle. Its main function is to transmit the power of the human body to the wheel system of the bicycle, so that the bicycle can generate power to run.

[0003] At present, bicycle transmission systems are mainly divided into two categories, one is a variable speed transmission system, and the other is a single speed transmission system. The types of transmission systems selected for different road conditions and different riding methods are also inconsistent. In addition, there are two-stage transmissions or multi-stage transmissions that appear in order to achieve higher speeds. The disadvantage of the single-speed bicycle in the prior art is that it runs slowly; ordinary variable speed bicycles are also one-stage transmissions after all, and the speed is not very fast; bicycles with more than two stages can run fast, but they are difficult to start. There is also an internal transmission, which is also a two-stage transmission bicycle. The internal transmission is like the transmission of a car gearbox. This transmission is not only complex but also expensive, and the maintenance price is also expensive. The lowest speed ratio is also above 1:2. It is also difficult to ride on steep slopes and is not very suitable for all terrains. Therefore, it is rarely used now. Ordinary bicycles in the prior art, whether single-speed or variable speed, are all one-stage transmission ratios, so the speed is not very fast, and for bicycle enthusiasts with extraordinary physical fitness, they cannot give full play to the joy brought by speed. At present, the domestic patent ZL 2019 2 212295.X (a bicycle with variable speed transmission) can basically solve the contradiction between easy starting and high-speed operation of the bicycle, but the speed ratio increased by the inter-stage speed change during the stage change process (i.e., from the primary transmission state to the secondary transmission state) is about 1:3, which cannot be lower. In this way, the speed ratio changes too much during the stage change process, which makes the riding experience of riders with average physical strength not very good; in addition, when stopping and restarting, manual operation is required to reduce the speed of the transmission system to the primary transmission state, otherwise it will be difficult to start, so the riding experience is not perfect. Summary of the invention

[0004] The present invention solves the shortcomings of the current background technology and proposes an automatic downgrade speed-changing transmission bicycle that is easy to start and climb and can be ridden at high speed. The invention is simple in technology, easy to operate, reliable in operation, convenient in maintenance, low in cost, energy-saving and environmentally friendly.

[0005] The specific technical solutions are as follows:

[0006] An automatic downshifting and speed-changing transmission bicycle comprises a bicycle stand, a middle shaft is mounted on the bicycle stand, a middle shaft sprocket set is mounted on the middle shaft, and the middle shaft sprocket set consists of three chain discs of different sizes;

[0007] The rear axle of the bicycle is provided with a tower base, a sun gear is fixedly mounted on the tower base, a planet carrier is provided on one side of the sun gear, a planetary twin gear is installed in the planet carrier, and a gear ring is matched on the axial outer side of the planetary twin gear;

[0008] A ratchet is provided on the axial outer side of the planetary frame, and the ratchet is cooperated with a pawl, and the pawl is installed on the bicycle frame. The pawl is controlled by pulling a speed change wire rope to the speed regulator next to the bicycle handlebar for adjustment, and the pawl and the ratchet are separated or combined by the retraction and release of the speed change wire rope to switch the primary transmission state and the secondary transmission state. A pin coupling A is provided on the axial outer side of the gear ring, and a main sprocket is installed side by side next to the gear ring. A one-way bearing is installed inside the main sprocket, and a pin coupling B is also provided on the main sprocket. The pin coupling A on the gear ring and the pin coupling B on the main sprocket are installed in cooperation, so that the main sprocket can effectively provide power for the planetary transmission.

[0009] Furthermore, the planetary carrier is provided with three sets of planetary twin gears, and the planetary twin gears are installed in the planetary carrier. The planetary carrier is provided with planetary twin gears to adapt to the steering of the bicycle transmission system in which the ring gear is actively operated to be consistent with the steering of the sun gear. The ring gear is active to reduce the speed ratio of the planetary transmission (the speed ratio is reduced from about 1:3 of the planetary carrier active to about 1:2. If the first-stage transmission is set to i1=1.5, the bicycle speed ratio of the planetary carrier active in the second-stage transmission is i=1.5*3=4.5, and the speed ratio of the ring gear active is i=1.5*2=3. Obviously, the speed ratio of 4.5 is suitable for power riders, and the speed ratio of 3 is more suitable for ordinary people) to improve the experience of ordinary riders.

[0010] Furthermore, the sun gear is fixed on the tower base of the rear axle of the bicycle, and the ring gear and the planet carrier are respectively located on both sides of the sun gear.

[0011] Furthermore, the middle shaft sprocket group is connected to the main sprocket through a chain to form a power input system. When the ratchet and the pawl are separated, the ratchet follows the main sprocket to rotate, and the planetary transmission does not intervene in the operation. At this time, the power is directly transmitted from the main sprocket to the tower base through the one-way bearing to drive the bicycle forward, thus forming a primary transmission system of the bicycle.

[0012] Furthermore, the middle shaft sprocket group is connected to the main sprocket through a chain to form a power input system. When the planetary frame ratchet and pawl are combined, the planetary frame cannot rotate with the main sprocket. At this time, the power is transmitted to the ring gear by the main sprocket through the pin coupling. Since the planetary frame is fixed, the ring gear drives the planetary twin gears and then drives the sun gear to drive the tower base and finally drives the bicycle forward, forming a secondary transmission system for the bicycle. At this time, the speed of the tower base is higher than the input speed of the main sprocket. Due to the use of a one-way bearing, the contradiction of different speeds of the two coaxial components is resolved.

[0013] Furthermore, the movement of the ratchet pawl is pulled by the speed change wire rope to the speed regulator next to the bicycle handlebar through the retraction and extension adjustment of the speed change wire rope and the separation and combination of the ratchet wheel.

[0014] Furthermore, a one-way bearing is installed inside the main sprocket.

[0015] Furthermore, the speed change steel wire rope runs parallel to the rear brake steel wire rope, and a linkage device is installed in the middle of the two steel wire ropes (see Figure 4 ), the brake linkage device includes a speed-changing steel wire rope, a speed-changing steel wire rope middle code, a brake steel wire rope, a linkage rod and a speed-changing steel wire rope middle code support. During the braking process of the rear brake device, the gear-changing device is activated to switch to the primary transmission, completing the automatic downshifting process. The speed-changing steel wire rope middle code allows the speed-changing steel wire rope to move only in one direction when the speed-changing system switches to the secondary transmission state, so that the secondary transmission state can be kept stable. When the front end (the smaller end) of the speed-changing steel wire rope middle code moves inward, the speed-changing steel wire rope will move in the opposite direction under the action of the return spring, thus causing the ratchet and the pawl to separate, so that the secondary transmission state of the bicycle is adjusted to the primary transmission state. The bicycle brake steel wire rope and the speed-changing steel wire rope middle code are linked to achieve automatic downshifting during braking, solving the problem of the bicycle being difficult to start due to the gear being too high when restarting after parking, thereby improving the riding experience.

[0016] The above technical solution has the following beneficial effects:

[0017] The present invention is easy to start, can run at high speed, has various functions, reliable operation, convenient maintenance, low cost, energy saving and environmental protection, has a good market prospect, and brings great convenience to cyclists. The present invention combines the characteristics of the primary and secondary transmission devices, and solves the problem that the bicycle can be easily started and driven uphill, and can be ridden at high speed. The secondary transmission state can be automatically converted to the primary transmission state when the riding slows down or stops, so as to ensure that the bicycle has a better riding experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The invention discloses a schematic diagram of the central axis structure of a bicycle with automatic downshifting and speed change transmission.

[0019] Figure 2 The invention discloses a schematic diagram of the structure of a planetary transmission of an automatic downshifting and speed-changing transmission bicycle.

[0020] Figure 3 The invention discloses a schematic diagram of the rear axle structure of a bicycle with automatic downshifting and speed change transmission.

[0021] Figure 4 The invention discloses a schematic diagram of the structure of a brake downgrade linkage device of an automatic downgrade and speed-changing transmission bicycle.

[0022] As shown in the figure: 1-bicycle stand; 2-middle shaft; 3-middle shaft sprocket set; 4-sun gear; 5-planet carrier; 6-planetary twin gear; 7-gear ring; 8-ratchet; 9-pawl; 10-pin coupling A; 11-pin coupling B; 12-main sprocket; 13-speed wire rope; 14-speed regulator; 15-chain; 16-rear axle; 17-planetary transmission; 18-tower base; 19-one-way bearing; 20-speed wire rope middle code; 21-brake wire rope; 22-linkage rod; 23-speed wire rope middle code support. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings.

[0024] Example 1: Figures 1 to 4 An automatic downshifting and speed-changing transmission bicycle shown in the figure comprises a bicycle frame 1, a middle shaft 2 is mounted on the bicycle frame 1, a middle shaft sprocket set 3 is mounted on the middle shaft 2, and the middle shaft sprocket set 3 is composed of three chain discs of different sizes;

[0025] The rear axle 16 of the bicycle is provided with a freewheel base 18, on which a sun gear is fixedly mounted, a planet carrier is provided on one side of the sun gear, a planetary twin gear is installed in the planet carrier, and a gear ring is provided on the axial outer side of the planetary twin gear;

[0026] A ratchet is provided on the axial outer side of the planetary frame, and the ratchet is cooperated with a pawl, and the pawl is installed on the bicycle frame 1. The pawl is controlled by a speed change wire rope 13 that is pulled to a speed regulator 14 next to the bicycle handlebar for adjustment. The pawl and the ratchet are separated or combined by the retraction and extension of the speed change wire rope 13 to switch between the primary transmission state and the secondary transmission state. A pin coupling A10 is provided on the axial outer side of the gear ring, and a main sprocket 12 is also installed side by side next to the gear ring. A one-way bearing 19 is installed inside the main sprocket 12, and a pin coupling B11 is also provided on the main sprocket 12. The pin coupling A10 on the gear ring and the pin coupling B11 on the main sprocket 12 are installed in cooperation, so that the main sprocket 12 can effectively provide power for the planetary transmission 17.

[0027] The planetary carrier is provided with three sets of planetary twin gears, which are installed in the planetary carrier in coordination. The planetary carrier is provided with planetary twin gears to adapt to the steering of the bicycle transmission system in which the ring gear is actively operated to be consistent with the steering of the sun gear. The ring gear is active to reduce the speed ratio of the planetary transmission 17 (the speed ratio is reduced from about 1:3 of the planetary carrier active to about 1:2) to improve the experience of ordinary riders.

[0028] The sun gear 4 is fixed on the freewheel base 18 of the rear axle 16 of the bicycle, and the ring gear 7 and the planet carrier 5 are respectively located on both sides of the sun gear 4 .

[0029] The middle shaft sprocket set 3 is connected to the main sprocket 12 through the chain 15 to form a power input system. When the ratchet 8 and the pawl 9 are separated, the ring gear 7 rotates with the main sprocket 12, and the planetary transmission 17 does not intervene in the operation. At this time, the power is directly transmitted from the main sprocket 12 to the tower base 18 through the one-way bearing 19 to drive the bicycle forward, thus forming a primary transmission system of the bicycle. Since the middle shaft sprocket set 3 has three sprockets of different sizes, the primary transmission system has three different speed ratios.

[0030] A speed-changing steel wire rope middle code 20 is installed between the ratchet 9 and the speed-changing steel wire rope 13. The speed-changing steel wire rope middle code 20 allows the speed-changing steel wire rope 13 to move in one direction only. When the front end (the smaller end) of the speed-changing steel wire rope middle code 20 moves inward, the speed-changing steel wire rope 13 can move in the opposite direction, which will cause the separation of the ratchet wheel 8 and the ratchet 9 and adjust the secondary transmission state of the bicycle to the primary transmission state. The bicycle brake steel wire rope and the speed-changing steel wire rope middle code are linked, and automatic downshifting can be achieved when braking, which solves the problem that the bicycle is difficult to start due to too high gear when restarting after parking, and improves the riding experience.

[0031] The middle shaft sprocket set 3 is connected to the main sprocket 12 through the chain 15 to form a power input system. When the ratchet 8 and the pawl 9 are combined, the planetary carrier 5 cannot rotate with the main sprocket 12. At this time, the main sprocket 12 drives the ring gear 7 of the planetary transmission 17 to rotate together through the pin coupling. Since the planetary carrier 5 is fixed, the ring gear 7 can only drive the sun gear 4 to rotate in the same direction through the planetary twin gear 6. The planetary transmission 17 intervenes in the transmission system to form a secondary transmission system of the bicycle. At this time, the speed of the tower base 18 is higher than the speed of the main sprocket 12. Due to the use of a one-way bearing 19, the contradiction of different speeds of the two coaxial components is resolved. The ratchet 8 can only fix the planetary carrier 5 in one direction, so the bicycle can still be chained in the secondary transmission state.

[0032] Since the middle shaft sprocket set 3 has three sprockets of different sizes, the secondary transmission system has three different speed ratios. The bicycle has a total of six different speed ratios for selection during riding.

[0033] The movement of the ratchet 99 is adjusted by the speed change wire rope 13 pulling the speed changer 14 next to the bicycle handlebar.

[0034] A speed-changing steel wire rope middle code 20 is added between the ratchet 9 and the speed-changing steel wire rope 13, and a brake downgrade linkage device is added to the rear brake device of the bicycle. Figure 4 As shown, the brake linkage device includes a speed-changing steel wire rope middle code 20, a brake steel wire rope 21, a linkage rod 22 and a speed-changing steel wire rope middle code support 23. During the braking process of the rear brake device, the gear-changing device is activated to switch to the primary transmission, completing the automatic downshifting process. The speed-changing steel wire rope middle code 20 allows the speed-changing steel wire rope 13 to move only in one direction. When the front end (the smaller end) of the speed-changing steel wire rope middle code 20 moves inward, the speed-changing steel wire rope 13 can move in the opposite direction, which will cause the ratchet wheel 8 and the pawl 9 to separate and adjust the secondary transmission state of the bicycle to the primary transmission state. The bicycle brake steel wire rope 21 and the speed-changing steel wire rope middle code 20 are linked, and automatic downshifting can be achieved during braking, solving the problem of the bicycle being difficult to start due to the high gear position when restarting after parking, thereby improving the riding experience.

[0035] The present invention combines the characteristics of the primary and secondary transmission devices, and solves the problem that the bicycle can be easily started and driven uphill, and can also be ridden at high speed. Since a brake-speed shifting linkage device is provided, the bicycle can automatically return to the primary transmission state in the braking and parking state to ensure a better riding experience of the bicycle.

[0036] The present invention retains the primary transmission system, so the transmission efficiency of the bicycle is improved as much as possible, and the minimum speed ratio can be about 1:1.5 or less, which not only improves the starting and climbing capabilities but also ensures the high transmission efficiency of the bicycle; due to the use of the secondary transmission system, the maximum speed ratio can reach more than 1:7, and the speed can reach more than 50 kilometers per hour or even higher.

[0037] A sun gear 4 is fixedly mounted on a tower base 18 of a rear wheel shaft 16 of a bicycle, a planet carrier 5 is provided on one side of the sun gear 4, a planetary twin gear 6 is installed in the planet carrier 5, a gear ring 7 is provided on the radial outer side of the planetary twin gear 6, a ratchet 8 is provided on the axial outer side of the planet carrier 5, the ratchet 8 is also provided with a pawl 9, the pawl 9 is mounted on the frame 1, and the movement of the pawl 9 is pulled by a speed change wire rope 13 to a transmission 14 next to the handlebar of the bicycle through the retraction and release control of the speed change wire rope 13 and the separation of the ratchet 8 and combined to complete the switching between the primary and secondary transmission states, a pin coupling A10 is provided on the axial outer side of the ring gear 76; a main sprocket 12 is also installed on the tower base 18 of the rear axle 16 of the bicycle, and a one-way bearing 19 is installed in the main sprocket 12 to achieve primary transmission and solve the problem of asynchronous rotation speed of the main sprocket 12 and the tower base 18 under the secondary transmission working state. A pin coupling B11 is also provided on the main sprocket 12, and the main sprocket 12 and the ring gear 76 are connected by a pin coupling to transmit the power of the main sprocket 12.

[0038] The basic principles and main features of the present invention are described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for illustrating the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which shall fall within the scope of the present invention to be protected. The scope of protection of the invention shall be defined by the attached claims and their equivalents.

Claims

1. A bicycle with automatic downshifting and speed change transmission, comprising a bicycle stand, characterized in that: The bicycle bracket is provided with a middle shaft, and the middle shaft is provided with a middle shaft sprocket set, wherein the middle shaft sprocket set is composed of three chain discs of different sizes; The rear axle of the bicycle is provided with a tower base, a sun gear is fixedly mounted on the tower base, a planet carrier is provided on one side of the sun gear, a planetary twin gear is installed in the planet carrier, and a gear ring is matched on the axial outer side of the planetary twin gear; A ratchet is provided on the axial outer side of the planetary frame, and a pawl is provided in cooperation with the ratchet, which is installed on the bicycle frame. The control of the pawl is adjusted by pulling the speed change wire rope to the speed regulator next to the bicycle handlebars. The pawl and the ratchet are separated or combined by the retraction and release of the speed change wire rope to switch the primary transmission state and the secondary transmission state. A pin coupling A is provided on the axial outer side of the gear ring, and a main sprocket is also installed side by side next to the gear ring. A one-way bearing is installed inside the main sprocket, and a pin coupling B is also provided on the main sprocket. The pin coupling A on the gear ring and the pin coupling B on the main sprocket are installed in cooperation, so that the main sprocket can effectively provide power for the planetary transmission; The movement of the ratchet pawl is completed by the speed-changing steel wire rope, and the direction of the speed-changing steel wire rope is parallel to the rear brake steel wire rope. A brake linkage device is installed between the speed-changing steel wire rope and the brake steel wire rope. The brake linkage device includes a speed-changing steel wire rope, a speed-changing steel wire rope middle code, a brake steel wire rope, a linkage rod and a speed-changing steel wire rope middle code base. During the braking process of the rear brake device, the gear-changing device is activated to switch to the first-stage transmission, thereby completing the automatic downshift process; The planetary carrier is provided with three or more sets of planetary twin gears, and the planetary twin gears are installed in the planetary carrier in cooperation. The planetary carrier is provided with planetary twin gears to adapt to the steering of the bicycle transmission system in which the ring gear is actively operated to be consistent with the steering of the sun gear. The ring gear is active to reduce the speed ratio of the planetary transmission, thereby reducing the minimum speed ratio of the bicycle in the secondary transmission, so as to improve the experience of ordinary riders.

2. The bicycle with automatic downshifting and speed change transmission according to claim 1, characterized in that: The sun wheel is fixed on the tower base of the rear axle of the bicycle, and the ring gear and the planet carrier are respectively located on both sides of the sun wheel.

3. The bicycle with automatic downshifting and speed change transmission according to claim 1, characterized in that: The middle shaft sprocket group is connected to the main sprocket through a chain to form a power input system. When the ratchet and the pawl are separated, the ratchet follows the main sprocket to rotate, and the planetary transmission does not intervene in the operation. At this time, the power is directly transmitted from the main sprocket to the tower base through the one-way bearing to drive the bicycle forward, thus forming a primary transmission system of the bicycle.

4. The bicycle with automatic downshifting and speed change transmission according to claim 1, characterized in that: The middle shaft sprocket set is connected to the main sprocket through a chain to form a power input system.

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