Crankset driving device with pedal driving and seat driving functions and bicycle

Abstract

The invention provides a crankset driving device with pedal driving and seat driving, which comprises a middle shaft, a supporting rod and a crankset, the supporting rod is mounted on a frame through a sliding assembly, a seat is mounted at the top end of the supporting rod, and a rack is arranged on one side of the lower part of the supporting rod; the middle shaft is sleeved with a one-way gear and a one-way bearing, the one-way gear is meshed with the rack, the one-way gear is connected with the chain wheel through a connecting piece, and the chain wheel is connected with the middle shaft through the one-way bearing. The rack on the supporting rod is used for driving the one-way gear to rotate, and the connecting piece is used for driving the chain wheel to rotate; meanwhile, the middle shaft is driven by pedals to directly rotate, the chain wheel is driven by a one-way bearing to rotate, the two driving modes do not interfere with each other, the two driving systems share one chain wheel, one flywheel and one transmission chain, only one set of transmission system is needed, the production cost is greatly reduced, and the production efficiency is improved. And the problems of noise and potential safety hazards caused by collision due to adoption of two sets of transmission chains are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of bicycles, and in particular to a crankset drive device and a bicycle capable of both pedal drive and seat drive. Background Art

[0002] Bicycles are a common means of transportation. Minimizing energy loss and ensuring riders feel effortless and agile is a key focus of the bicycle manufacturing industry. To achieve this, some manufacturers have adopted elliptical wheel shapes, installed bearings on the front and rear wheels, and employed gravity-driven propulsion.

[0003] The human body gravity-driven method is to design the support rod of the bicycle seat into a sliding structure, and use the human body's gravity to drive the seat support rod to slide, so as to use the engagement of the rack (installed on the seat support rod) and the gear to drive the gear to rotate, and then drive the chainring to rotate; although this gravity-driven method can achieve the effect of saving effort, gravity-driven and pedal-driven methods are prone to conflict and affect each other, thereby reducing the riding experience.

[0004] In order to solve the problem that gravity drive and pedal drive easily conflict, Chinese patent publication number CN217396750U discloses a dual-flywheel dual-drive bicycle, which realizes the independent operation of gravity drive and pedal drive by designing two sets of flywheels, two sets of ratchet wheels and two sets of transmission chains without interfering with each other.

[0005] Although the above design solves the problem of easy conflict between gravity drive and pedal drive, the use of two independent drive mechanisms not only increases production costs, but also makes it easy for collisions to occur between the two transmission chains, which not only causes noise but also poses certain safety hazards. Summary of the Invention

[0006] The present invention provides a crankset drive device and a bicycle that are both pedal-driven and seat-driven, which solves the problems of the prior art dual-drive bicycle using two independent drive mechanisms, high production costs, and easy collisions between the two transmission chains, resulting in noise and safety hazards.

[0007] The technical solution of the present invention is achieved as follows:

[0008] In the first aspect of the present invention, a chainring drive device with both pedal drive and seat drive is provided, including a bottom bracket, a support rod, and a chainring. The support rod is installed on the frame through a sliding assembly. A seat is installed at the top of the support rod. A rack is provided on one side of the lower part of the support rod. A one-way gear and a one-way bearing are sleeved outside the bottom bracket. The one-way gear meshes with the rack, and the one-way gear is connected to the chainring through a connecting member. The chainring is connected to the bottom bracket through a one-way bearing. The one-way gear is configured to: when driving the support rod to slide up and down along the sliding assembly, drive the one-way gear to rotate through the rack, and drive the chainring to rotate in a single direction through the connecting member. The one-way bearing is configured to: when the pedal drives the bottom bracket to rotate, drive the chainring to rotate in the single direction.

[0009] Specifically, the one-way gear includes a gear body. The gear body is rotationally connected to the bottom bracket through a first bearing. A concentric first concave cavity is provided on one side of the gear body facing the chainring. A transmission wheel is provided in the first concave cavity. The transmission wheel is rotationally connected to the bottom bracket through a second bearing. The outer wall circumferential surface of the transmission wheel and the inner wall circumferential surface of the first concave cavity are in transmission connection through a ratchet and a pawl. The side surface of the transmission wheel is connected to the side surface of the chainring through a connecting member.

[0010] Further, the connecting member is a cylinder or multiple connecting rods.

[0011] Specifically, the one-way bearing includes an inner ring and an outer ring. The outer ring is rotationally connected to the bottom bracket through a third bearing. The chainring is fixedly connected to the outer ring. A concentric second concave cavity is provided on the side surface of the outer ring. The inner ring is located in the second concave cavity and is fixedly connected to the bottom bracket. The outer wall circumferential surface of the inner ring and the inner wall circumferential surface of the second concave cavity are in transmission connection through a ratchet and a pawl.

[0012] Specifically, the sliding assembly includes a sleeve fixedly connected to the frame. A sliding cavity is provided inside the sleeve. A slider is provided outside the support rod and is in sliding fit with the sliding cavity. A first limiting ring and a second limiting ring are respectively provided at the top and bottom of the sleeve. The inner diameters of the first limiting ring and the second limiting ring are smaller than the outer diameter of the slider. A reset element is provided in the sliding cavity for applying a thrust to force the slider to slide upward along the sliding cavity to reset.

[0013] Further, the reset element is a compression spring. The compression spring is sleeved outside the support rod, and the two ends of the compression spring are respectively abutted against the slider and the second limiting ring.

[0014] Further, a buffer washer is provided on the bottom surface of the first limiting ring.

[0015] In the second aspect of the present invention, a bicycle is provided. The chainring of the bicycle is driven by the chainring drive device with both pedal drive and seat drive.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: By installing a one-way gear and a one-way bearing on the central shaft, the present invention can not only drive the support rod to slide up and down through the seat, drive the one-way gear to rotate by means of the rack on the support rod, and drive the chainring to rotate with the help of the connecting piece; at the same time, it can also directly drive the central shaft to rotate by pedaling, and drive the chainring to rotate with the help of the one-way bearing, realizing that the two driving methods do not interfere with each other, and sharing a set of chainring, flywheel and drive chain. Only one set of transmission system is required, which greatly reduces the production cost, and effectively solves the problem of noise and safety hazards caused by easy collision between the two drive chains. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 is an axial sectional structure schematic diagram of a chainring drive device with both pedal drive and seat drive according to the present invention;

[0019] Figure 2 is a radial sectional structure schematic diagram of the one-way gear in the embodiment of the present invention;

[0020] Figure 3 is a radial sectional structure schematic diagram of the one-way bearing in the embodiment of the present invention;

[0021] Figure 4 is an internal structure schematic diagram of the sliding component in the embodiment of the present invention;

[0022] Figure 5 is a structure schematic diagram of a bicycle in the embodiment of the present invention;

[0023] In the figure: 1, central shaft; 2, support rod; 3, chainring; 4, sliding component; 5, frame; 6, seat; 7, rack; 8, connecting piece; 9, gear body; 10, first bearing; 11, first concave cavity; 12, transmission wheel; 13, second bearing; 14, ratchet; 15, pawl; 16, inner ring; 17, outer ring; 18, third bearing; 19, second concave cavity; 20, sleeve; 21, sliding cavity; 22, slider; 23, first limiting ring; 24, second limiting ring; 25, compression spring; 26, buffer washer; 27, front wheel; 28, rear wheel; 29, pedal; 30, flywheel; 31, drive chain. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] Referring to Figures 1 to 4 , a chainring drive device with both pedal drive and seat drive is provided in the first aspect of the present invention, including a bottom bracket 1, a support rod 2, and a chainring 3. The support rod 2 is installed on the frame 5 through a sliding component 4. A seat 6 is installed at the top of the support rod 2. A rack 7 is provided on one side of the lower part of the support rod 2. A one-way gear and a one-way bearing are sleeved outside the bottom bracket 1. The one-way gear meshes with the rack 7, and the one-way gear is connected to the chainring 3 through a connecting member 8. The chainring 3 is connected to the bottom bracket 1 through a one-way bearing. The one-way gear is configured such that when the support rod 2 is driven to slide up and down along the sliding component 4, the one-way gear is driven to rotate through the rack 7, and the chainring 3 is driven to rotate in a single direction through the connecting member 8. The one-way bearing is configured such that when the bottom bracket 1 is driven to rotate by pedaling, the chainring 3 is driven to rotate in the single direction.

[0026] Specifically, as Figure 2 shown, the one-way gear includes a gear body 9. The gear body 9 is rotatably connected to the bottom bracket 1 through a first bearing 10. A concentric first concave cavity 11 is provided on one side of the gear body 9 facing the chainring 3. A transmission wheel 12 is provided in the first concave cavity 11. The transmission wheel 12 is rotatably connected to the bottom bracket 1 through a second bearing 13. The outer wall surface of the transmission wheel 12 and the inner wall surface of the first concave cavity 11 are in transmission connection through a ratchet 14 and a pawl 15. The pawl 15 is automatically rebounded through a micro torsion spring. The side surface of the transmission wheel 12 is connected to the side surface of the chainring 3 through a connecting member 8.

[0027] The working principle of the one-way gear is as follows: When the rack 7 moves downward to drive the gear body 9 to rotate counterclockwise, if the rotation speed of the gear body 9 is greater than that of the transmission wheel 12, the pawl 15 on the transmission wheel 12 will catch the ratchet 14 on the gear body 9, so as to drive the transmission wheel 12 to rotate counterclockwise through the gear body 9, and then drive the chainring 3 to rotate counterclockwise through the transmission wheel 12. If the rotation speed of the gear body 9 is less than that of the transmission wheel 12, the pawl 15 on the transmission wheel 12 will release the ratchet 14 on the gear body 9, so that the gear body 9 and the transmission wheel 12 are temporarily disengaged from the transmission connection. When the rack 7 moves upward to drive the gear body 9 to rotate clockwise idly, the pawl 15 on the transmission wheel 12 will release the ratchet 14 on the gear body 9, so that the gear body 9 and the transmission wheel 12 are temporarily disengaged from the transmission connection. The chainring 3 and the transmission wheel 12 will continue to rotate counterclockwise under the action of inertia.

[0028] Furthermore, the connecting member 8 is a cylinder or multiple connecting rods. In this embodiment, a cylinder is adopted, and the structure is more firm.

[0029] Specifically, as Figure 3 shown, the one-way bearing includes an inner ring 16 and an outer ring 17. The outer ring 17 is rotationally connected to the central shaft 1 through a third bearing 18, and the chainring 3 is fixedly connected to the outer ring 17; a concentric second concave cavity 19 is provided on the side surface of the outer ring 17, the inner ring 16 is located in the second concave cavity 19 and is fixedly connected to the central shaft 1, and the outer circumferential surface of the outer wall of the inner ring 16 is in transmission connection with the inner circumferential surface of the second concave cavity 19 through a ratchet 14 and a pawl 15. The pawl 15 realizes automatic rebound through a micro torsion spring;

[0030] The working principle of the one-way bearing is as follows: When stepping on the pedal 29 to drive the central shaft 1 to rotate counterclockwise, the central shaft 1 drives the inner ring 16 to rotate counterclockwise. If the rotation speed of the inner ring 16 is greater than that of the outer ring 17, the pawl 15 of the inner ring 16 will catch the ratchet 14 of the outer ring 17, thereby driving the outer ring 17 and the chainring 3 to rotate; if the rotation speed of the inner ring 16 is less than that of the outer ring 17 or the inner ring 16 rotates idly clockwise, the pawl 15 of the inner ring 16 will release the ratchet 14 of the outer ring 17, so that the inner ring 16 is temporarily disengaged from the transmission connection with the outer ring 17.

[0031] Specifically, as Figure 4 shown, the sliding assembly 4 includes a sleeve 20 fixedly connected to the vehicle frame 5. A sliding cavity 21 is provided inside the sleeve 20. A slider 22 that is slidably matched with the sliding cavity 21 is provided outside the support rod 2. First limiting rings 23 and second limiting rings 24 are respectively provided at the top end and the bottom end of the sleeve 20. The inner diameters of the first limiting ring 23 and the second limiting ring 24 are smaller than the outer diameter of the slider 22; a reset element is provided in the sliding cavity 21 for applying a thrust force to force the slider 22 to slide upward along the sliding cavity 21 to reset. The first limiting ring 23 is used to prevent the slider 22 from disengaging from the top of the sliding cavity 21, and the second limiting ring 24 is used to prevent the slider 22 from disengaging from the bottom of the sliding cavity 21 and is also used for the installation of the reset element.

[0032] Furthermore, as Figure 4 shown, the reset element is a compression spring 25. The compression spring 25 is sleeved outside the support rod 2, and both ends of the compression spring 25 are respectively abutted against the slider 22 and the second limiting ring 24; the compression spring 25 is used to provide an upward thrust force to push the slider 22 to slide upward along the sliding cavity 21 to reset the support rod 2, facilitating the support rod 2 to slide up and down repeatedly to drive the one-way gear to rotate.

[0033] Furthermore, as Figure 4As shown, a buffer washer 26 is provided on the bottom surface of the first limiting ring 23. When the slider 22 slides upward along the sliding cavity 21 under the thrust of the compression spring 25 and abuts against the first limiting ring 23, the buffer washer 26 can play a buffering role. On the one hand, it reduces the damage of mechanical components caused by impact, and on the other hand, it can reduce the noise caused by impact and improve the riding experience. The buffer washer 26 is made of rubber or polyurethane, with a thickness of 3 - 5 mm and a Shore hardness of 60 - 70A. It is fixed to the bottom surface of the first limiting ring 23 by gluing or a clamping groove, and can absorb the impact energy when the slider 22 resets, reducing the noise to below 50 dB.

[0034] As Figure 5 As shown, in the second aspect of the present invention, a bicycle is provided. The bicycle includes a frame 5, a seat 6, a front wheel 27, a rear wheel 28, a foot pedal 29, a chainring 3, a flywheel 30, and a drive chain 31. The chainring 3 is installed on the central shaft 1, the foot pedals 29 are installed at both ends of the central shaft 1, the flywheel 30 is installed on the rotating shaft of the rear wheel 28, and the chainring 3 is connected to the flywheel 30 through the drive chain 31; the chainring 3 of the bicycle is driven by the chainring 3 drive device that combines foot pedal drive and seat 6 drive;

[0035] The drive modes of the bicycle of the present invention include:

[0036] Seat drive: When the rider presses down the center of gravity, the support rod 2 drives the rack 7 to move downward, driving the one-way gear to rotate counterclockwise, and driving the chainring 3 to rotate through the connecting member 8; the return spring rebounds when the center of gravity moves upward, and the upward movement of the rack 7 causes the one-way gear to rotate idly, without affecting the inertial movement of the chainring 3.

[0037] Foot pedal drive: When pedaling, the central shaft 1 rotates counterclockwise, and the inner ring 16 of the one-way bearing drives the outer ring 17 and the chainring 3 to rotate synchronously through the pawl 15; if pedaling stops, when the chainring 3 rotates inertially, the one-way bearing automatically disengages to avoid reverse resistance.

[0038] Dual drive cooperation: The seat 6 drive and the foot pedal drive act independently on the same chainring 3 through a one-way mechanism, and can be used alternately or with superimposed force during riding without switching operations.

[0039] The drive principle of the bicycle of the present invention is as follows:

[0040] During cycling, the human body's gravity is exerted on the bicycle seat 6. Due to reasons such as uneven road surfaces and the transfer of the human body's center of gravity, the seat 6 will drive the support rod 2 to slide up and down along the sliding assembly 4. During the downward sliding of the support rod 2, the rack 7 on one side of the lower part of the support rod 2 drives the one-way gear to rotate counterclockwise (at this time, the pawl 15 of the one-way gear will catch the ratchet 14). The one-way gear drives the chainring 3 to rotate counterclockwise through the connecting piece 8, thereby providing assistance for the cyclist to drive the rotation of the chainring 3 and playing a role in saving effort; when the support rod 2 slides upward under the thrust of the compression spring 25, the rack 7 on one side of the support rod 2 drives the one-way gear to rotate clockwise idly (at this time, the pawl 15 of the one-way gear will release the ratchet 14, and the gear body 9 rotates clockwise idly, and the inner transmission wheel 12 continues to rotate counterclockwise under the action of inertia); at the same time, the cyclist can drive the bottom bracket 1 to rotate counterclockwise by stepping on the pedals. The bottom bracket 1 drives the inner ring 16 of the one-way bearing to rotate counterclockwise (at this time, the pawl 15 of the one-way bearing will catch the ratchet 14). The bottom bracket 1 drives the chainring 3 to rotate counterclockwise through the one-way bearing, providing the main power for the cyclist to drive the rotation of the chainring 3; when the speed at which the cyclist steps on the pedals is lower than the rotation speed of the chainring 3 (at this time, the pawl 15 of the one-way bearing will release the ratchet 14), the chainring 3 continues to rotate counterclockwise under the action of inertia and will not affect the bottom bracket 1 and the one-way gear.

[0041] By installing a one-way gear and a one-way bearing on the bottom bracket 1, the present invention can not only drive the support rod 2 to slide up and down through the seat 6, use the rack 7 on the support rod 2 to drive the one-way gear to rotate, and drive the chainring 3 to rotate through the connecting piece 8; at the same time, it can also directly drive the bottom bracket 1 to rotate through the pedals and drive the chainring 3 to rotate through the one-way bearing, realizing that the two driving methods do not interfere with each other, and sharing a chainring 3, a freewheel 30 and a transmission chain 31, only requiring a set of transmission systems, greatly reducing the production cost, and effectively solving the problems of noise and safety hazards caused by easy collision between the two transmission chains.

[0042] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A chainring drive device with both pedal drive and seat drive, comprising a bottom bracket (1), a support rod (2) and a chainring (3). The support rod (2) is installed on a frame (5) through a sliding component (4). A seat (6) is installed at the top end of the support rod (2). A rack (7) is arranged on one side of the lower part of the support rod (2); characterized in that, A one-way gear and a one-way bearing are sleeved outside the central shaft (1). The one-way gear meshes with a rack (7), and the one-way gear is connected to a chainring (3) through a connecting member (8). The chainring (3) is connected to the central shaft (1) through a one-way bearing.

2. The chainwheel drive device with both pedal drive and seat drive as claimed in claim 1, wherein, The one-way gear includes a gear body (9). The gear body (9) is rotatably connected to the central shaft (1) through a first bearing (10). A concentric first concave cavity (11) is provided on one side of the gear body (9) facing the chainring (3). A transmission wheel (12) is provided in the first concave cavity (11). The transmission wheel (12) is rotatably connected to the central shaft (1) through a second bearing (13). The outer circumferential surface of the transmission wheel (12) is in transmission connection with the inner circumferential surface of the first concave cavity (11) through a ratchet (14) and a pawl (15). The side surface of the transmission wheel (12) is connected to the side surface of the chainring (3) through a connecting member (8).

3. The chainring drive device with both foot pedal drive and seat drive according to claim 1, characterized in that, The connecting member (8) is a cylinder or multiple connecting rods.

4. A chainring drive device with both pedal drive and seat drive as described in claim 1, characterized in that The one-way bearing includes an inner ring (16) and an outer ring (17). The outer ring (17) is rotatably connected to the central shaft (1) through a third bearing (18). The chainring (3) is fixedly connected to the outer ring (17). A concentric second concave cavity (19) is provided on the side surface of the outer ring (17). The inner ring (16) is located in the second concave cavity (19) and is fixedly connected to the central shaft (1). The outer circumferential surface of the inner ring (16) is in transmission connection with the inner circumferential surface of the second concave cavity (19) through a ratchet (14) and a pawl (15).

5. A chainring drive device with both pedal drive and seat drive as described in claim 1, characterized in that, The sliding assembly (4) includes a sleeve (20) fixedly connected to a vehicle frame (5). A sliding cavity (21) is provided inside the sleeve (20). A slider (22) that is slidably matched with the sliding cavity (21) is provided outside a support rod (2). A first limiting ring (23) and a second limiting ring (24) are respectively provided at the top end and the bottom end of the sleeve (20). The inner diameters of the first limiting ring (23) and the second limiting ring (24) are smaller than the outer diameter of the slider (22). A reset element is provided in the sliding cavity (21) for applying a thrust force to force the slider (22) to slide upward along the sliding cavity (21) for resetting.

6. The chainwheel drive device with both pedal drive and seat drive as described in claim 5, characterized in that, The reset element is a compression spring (25). The compression spring (25) is sleeved outside the support rod (2), and the two ends of the compression spring (25) are respectively abutted against the slider (22) and the second limiting ring (24).

7. A chainring drive device with both pedal drive and seat drive as described in claim 5, characterized in that, A buffer washer (26) is provided on the bottom surface of the first limiting ring (23).

8. A bicycle, characterized in that, The chainring (3) of the bicycle is driven by a chainring driving device with both pedal driving and seat driving as described in any one of claims 1 to 7.

Images