Frame set for bicycle, bicycle assembly and bicycle

Abstract

The invention provides a bicycle frame set, a bicycle assembly and a bicycle, the bicycle frame set comprises a lower tube, a rear lower fork, a vertical tube and a supporting tube, the rear lower fork comprises a connecting part and two fork parts, the rear end of the connecting part is connected to the front ends of the two fork parts, the front end of the connecting part is connected to the bottom of the lower tube, the vertical tube is arranged between the rear lower fork and the lower tube, and the supporting tube is arranged between the rear lower fork and the lower tube. The vertical pipe is bent to form a first pipe part and a second pipe part which define a second obtuse angle structure, the first pipe part is connected to the portion, adjacent to the connecting part, of the lower pipe, the second pipe part is obliquely arranged upwards and backwards relative to the connecting part, the first pipe part, the second pipe part and the lower pipe define an avoiding cavity, and the supporting pipe is connected to the first pipe part and the connecting part. And the three parts form a triangular structure or a triangular-like structure. The bicycle frame group has the advantage of obviously reducing obstruction to the foot striding process of a user while being beneficial to improving the load bearing stability of the vertical pipe, so that the bicycle with the bicycle frame group has the advantage of being convenient to get on and get off.

Description

Technical Field

[0001] This invention relates to the technical field of bicycle setups, and more specifically to a bicycle frame assembly, bicycle components, and a bicycle. Background Technology

[0002] To ensure stability, current bicycles typically have a slanted, one-way extending seat tube protruding from the junction of the slanted downtube and the horizontally positioned chainstays. Furthermore, multiple top tubes connect the downtube and the seat tube, with at least one top tube connecting the top of the downtube (near the handlebars) and the top of the seat tube (near the saddle), making it difficult for users to get on and off the bicycle. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the present invention aims to provide a frame assembly for bicycles that improves the load-bearing stability of the seat tube while significantly reducing the obstruction to the user's stride, thereby making it easier to get on and off the bicycle.

[0004] To solve the above problems, the technical solution adopted by the present invention is as follows: A bicycle frame assembly includes a downtube, a chainstay, and a seat tube. The frame assembly is defined as being in use when mounted on an upright wheel. In the use state, the chainstay is horizontally positioned, and the downtube is tilted upward and forward relative to the chainstay to form a first obtuse angle structure. The chainstay includes a connecting portion and two spaced-apart fork portions. The rear end of the connecting portion is connected to the front end of the two fork portions to form a rear wheel housing cavity, and the front end of the connecting portion is connected to the bottom of the downtube. The seat tube is located between the chainstay and the downtube. The seat tube is bent to form a first tube section and a second tube section that enclose a second obtuse angle structure. The opening of the second obtuse angle structure faces the downtube. The first tube section is connected to the downtube at the portion adjacent to the connecting part. The second tube section is inclined upward and backward relative to the connecting part. The first tube section, the second tube section, and the downtube enclose a clearance cavity. The clearance cavity has an opening that faces away from the chainstay. The clearance cavity is used for the user to straddle the left and right sides of the frame assembly to get on and off the vehicle. The second tube section is used to install the seat. The frame assembly also includes a support tube, which is connected to the first tube portion and the connecting portion, so that the three form a triangular structure or a triangular-like structure.

[0005] In some possible implementations, when viewed from the fork towards the connecting portion, the support tube and the connecting portion are arranged at an acute angle.

[0006] In some possible implementations, the first tube portion includes a first arc-shaped tube body and a first flat tube body that surround and form a cavity. When viewed along the diameter direction of the first tube portion, the first arc-shaped tube body is laterally bent toward the clearance cavity, the first flat tube body is disposed toward the connecting portion, and the support tube is connected to the first flat tube body.

[0007] In some possible implementations, the second tube section includes a second arc-shaped tube body and a second flat tube body that surround and form a cavity. When viewed along the diameter direction of the second tube section, the second arc-shaped tube body is laterally curved toward the clearance cavity, and the second flat tube body is disposed away from the lower tube. The first arc-shaped tube body and the second arc-shaped tube body are adjacent to each other, and the second flat tube body and the first flat tube body are adjacent to each other.

[0008] In some possible implementations, the support tube includes a third arc-shaped tube body and a third flat tube body that surround and form a cavity. When viewed along the diameter direction of the support tube, the third arc-shaped tube body is laterally bent toward the first flat tube body, and the third flat tube body is disposed away from the lower tube.

[0009] In some possible implementations, the third arc-shaped tube is bent at an obtuse angle, with the bent portion located adjacent to the first tube section, such that the supporting tube, the first tube section, and the connecting portion form a triangular-like structure.

[0010] In some possible implementations, it also includes: A chainring mount is connected to the bottom of the downtube. The chainring mount is used to mount the chainring of the bicycle. The chainring mount and the downtube form a second obtuse angle structure. The connecting part is supported by the chainring mount. The support tube is also connected to the chainring mount.

[0011] This application also provides a bicycle assembly, the bicycle assembly including the aforementioned frame assembly, and the bicycle assembly further including: A rear coat rack is connected to the two forks. The rear coat rack includes a support seat, which is located on the side of the rear wheel accommodating cavity near the riser. A rear fender, located on the side of the load seat opposite the chainstay, is curved toward the load seat and partially covers the rear wheel of the bicycle. The rear fender is connected to the rear rack or the frame assembly. A buffer rod is connected to the frame assembly. The buffer rod abuts against the curved inner end face of the rear fender. The buffer rod is bent toward the rear fender. The projection of the buffer rod is placed outside the cargo seat. The buffer rod is used to generate recoverable deformation to provide support when the cargo seat is driven downward by an external force to trigger the pressing of the rear fender.

[0012] In some possible implementations, the inner curved end face of the buffer rod is recessed to form a first groove. Relative to the first groove, the left and right end faces of the buffer rod are each recessed to form a second groove. Both the first and second grooves extend along the bending direction of the buffer rod, such that both the first and second grooves are exposed at the two extended ends of the buffer rod. Relative to the depth direction of the first groove, the first groove has left and right outer edges. Relative to the depth direction of the second groove, the second groove also has left and right outer edges.

[0013] In some possible implementations, the back hanger further includes: A contact strip protrudes from the rear mudguard onto the cargo seat. The contact strip is used to press the rear mudguard when the cargo seat is driven downward by an external force. The contact strip includes an arc-shaped portion and a straight portion. The arc-shaped portion is connected between the straight portion and the cargo seat. The straight portion extends along the tangent direction of the curved outer end face of the rear mudguard. The curved inner end face of the arc-shaped portion is oriented towards or away from the riser.

[0014] In some possible implementations, the back hanger further includes two support frames, each of which is connected between one of the forks and the carrier, and the support frame includes a first frame bar, a second frame bar, and a third frame bar; The first frame bar includes a first section and a second section connected to form a third obtuse angle structure. The opening of the third obtuse angle structure faces the riser. The extension end of the first section is connected to the load base, and the extension end of the second section is connected to the fork. The second frame bar, the third frame bar, and the second section are connected in a triangular structure. The second frame bar and the third frame bar are located on the side of the second section away from the riser. The second frame bar is supported by the fork.

[0015] In some possible implementations, the support frame further includes: The fourth frame bar includes a third section and a fourth section connected to form a fourth obtuse angle structure. The opening of the fourth obtuse angle structure is disposed away from the riser. Viewed from the fork towards the load base, the vertex of the fourth obtuse angle structure is higher than the vertex of the third obtuse angle structure. The extension end of the third section is connected to the load base, and the extension end of the fourth section is connected to the second section. The fifth strip connects the first strip and the third strip.

[0016] This application also provides a bicycle including the aforementioned frame assembly.

[0017] This application also provides a bicycle that includes the bicycle assembly described above.

[0018] In some possible implementations, the bicycle is an electric-assisted bicycle, and the end face of the downtube facing away from the clearance cavity is recessed to form a battery receiving groove. The bicycle also includes a battery cover, which is snapped into the battery receiving groove and the two together form a battery receiving cavity. The battery receiving cavity is used to install a battery assembly that supplies power to the drive motor. The edge of the battery cover is provided with an opening groove, which is used for the user to fasten and remove the battery cover.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: In this application, by modifying the structure of the seat tube, the gravitational load can be transmitted downwards and outwards along the first and second tube sections. Furthermore, by increasing the number of support points on the seat tube, the torque caused by the gravitational load applied to the second tube section when the user sits on the saddle is reduced. Additionally, the introduction of an extra support tube, forming a triangular or near-triangular structure with the first tube section and the connecting section, further stabilizes the seat tube, thereby improving its load-bearing stability. Therefore, there is no need to install an additional top tube at the top of the seat tube and downtube to balance the large torque caused by the load on the inclined straight seat tube (which has only one support point at the junction of the chainstays and downtube). This allows the clearance cavity (for the user to straddle) formed by the first, second, and downtube sections to have an opening away from the chainstays. The connection between the first tube section and the downtube adjacent to the connecting section significantly reduces the obstruction to the user's straddling motion, thus improving the ease of getting on and off the bicycle when the frame is used.

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a bicycle provided in one embodiment of this application.

[0022] Figure 2 for Figure 1 The bicycle shown is a cross-sectional view. Figure 3 for Figure 1 A cross-sectional view of the bicycle from another angle and direction.

[0023] Figure 4 for Figure 2 An enlarged view of part A shown; Figure 5 for Figure 1 The diagram shows the structure of a bicycle with the rear fender removed.

[0024] Figure 6 for Figure 5 An enlarged view of part B.

[0025] Explanation of reference numerals in the attached figures: 10-Lower tube; 11-Toothed plate mounting base; 111-Protruding buckle; 20-Rear lower fork; 21-Connecting part; 22-Fork part; 30-Upright tube; 31-First tube part; 311-First arc-shaped tube body; 312-First flat tube body; 32-Second tube part; 321-Second arc-shaped tube body; 322-Second flat tube body; 301-Allowing cavity; 40-Support tube; 41-Third arc-shaped tube body; 42-Third flat tube body; 50-Rear clothes rack; 51-Loading seat; 52-Contact strip; 521-Arched part; 522-Straight part; 53-Support frame; 531-First rack strip ; 5311-First section; 5312-Second section; 532-Second frame bar; 533-Third frame bar; 534-Fourth frame bar; 5341-Third section; 5342-Fourth section; 535-Fifth frame bar; 60-Rear fender; 61-Connecting bar; 70-Buffer bar; 701-Snap-in hole; 71-First groove; 72-Second groove; 80-Battery cover; 91-Seat cushion; 92-Seat post; 93-Rear wheel; 94-Handlebar; 95-Front fork; 951-Front wheel; 96-Chain chain; 97-Freewheel; 98-Drive chain; 99-Crank. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0027] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are constructed to distinguish different objects, not to describe a particular order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The accompanying drawings only depict the stacking relationship between different layers and do not limit their thickness relationships.

[0028] Reference Figure 1This application provides an embodiment of a bicycle frame assembly, which includes a downtube 10, a chainstay 20, and a seat tube 30. The state in which the frame assembly is mounted on an upright wheel is defined as the usage state (e.g.,...). Figure 1 As shown, when in use, the rear lower fork 20 is horizontally positioned, and the lower tube 10 is inclined upward and forward relative to the rear lower fork 20 to jointly form a first obtuse angle structure. The rear lower fork 20 includes a connecting portion 21 and two spaced-apart fork portions 22. The rear end of the connecting portion 21 is connected to the front end of the two fork portions 22 to jointly form a rear wheel accommodating cavity. For example, the connecting portion 21 and the two fork portions 22 can be integrally formed. The front end of the connecting portion 21 is connected to the bottom of the lower tube 10. For example, the connecting portion 21 and the lower tube 10 can be connected by means including but not limited to welding. The riser 30 is disposed between the rear lower fork 20 and the lower tube 10. The riser 30 is bent to obtain a first tube portion 31 and a second tube portion 32 that enclose and form a second obtuse angle structure. The opening of the second obtuse-angled structure faces the lower tube 10. The first tube 31 is connected to the lower tube 10 at the location adjacent to the connecting part 21. For example, the first tube 31 and the lower tube 10 can be connected by means including but not limited to welding. The second tube 32 is inclined upward and backward relative to the connecting part 21. The first tube 31, the second tube 32, and the lower tube 10 together form a clearance cavity 301. The clearance cavity 301 has an opening facing away from the rear chainstay 20. The clearance cavity is used for the user to straddle between the left and right sides of the frame assembly to facilitate getting on and off the vehicle. The second tube 32 is used to install the seat 91. Therefore, when the user sits on the seat 91, the applied gravity load is transmitted downward from the second tube 32. The frame assembly also includes a support tube 40, which is connected to the first tube 31 and the connecting part 21, so that the three (support tube 40, first tube 31, and connecting part 21) form a triangular or triangular structure. The support pipe 40, the first pipe section 31, and the connecting section 21 can be connected by means including but not limited to welding. For example, the support pipe 40 is connected to the bend of the first pipe section 31 adjacent to the riser 30.

[0029] In this application, by modifying the structure of the riser 30, the gravitational load can be transmitted downward and outward along the first pipe section 31 and the second pipe section 32. Furthermore, by increasing the number of support points on the riser 30, the torque caused by the gravitational load applied to the second pipe section 32 when the user sits on the seat cushion 91 is reduced. Additionally, the introduced support pipe 40, together with the first pipe section 31 and the connecting part 21, forms a triangular or near-triangular structure, further stabilizing the riser 30 and thus improving its load-bearing stability. Therefore, it is unnecessary to modify the riser 30. The top of the 0 and the bottom tube 10 also need to be equipped with an additional top tube to balance the large torque caused by the inclined straight tube riser (which has only one support point at the junction of the rear chainstay and the bottom tube) when it is under load. This allows the clearance cavity 301 (for the user to straddle) formed by the first tube section 31, the second tube section 32 and the bottom tube 10 to have an opening that is away from the rear chainstay 20. Furthermore, the first tube section 31 is connected to the bottom tube 10 adjacent to the connecting part 21, which significantly reduces the obstruction of the frame assembly to the user's straddling process. This makes it easier to get on and off the bicycle when the frame assembly is used to form a bicycle.

[0030] In some embodiments, when viewed from the fork portion 22 toward the connecting portion 21, the support tube 40 and the connecting portion 21 are arranged at an acute angle, which helps to reduce the extension deviation angle between the support tube 40 and the second tube portion 32, thereby further improving the supporting force of the support tube 40 and further improving the load stability of the riser 30.

[0031] In some embodiments, in conjunction with reference Figure 3 The first pipe section 31 includes a first arc-shaped pipe body 311 and a first flat pipe body 312 that surround and form a pipe cavity. Viewed along the diameter direction of the first pipe section 31, the first arc-shaped pipe body 311 is laterally bent towards the relief cavity 301, and the first flat pipe body 312 is positioned towards the connecting part 21. The support pipe 40 is connected to the first flat pipe body 312. The structure of the first pipe section 31 is conducive to further improving the load-bearing stability of the riser 30. The first arc-shaped pipe body 311 and the first flat pipe body 312 can be connected by means including but not limited to integral molding or welding.

[0032] In some embodiments, the second pipe section 32 includes a second arc-shaped pipe body 321 and a second flat pipe body 322 surrounding and forming a cavity. Viewed along the diameter direction of the second pipe section 32, the second arc-shaped pipe body 321 is laterally curved towards the clearance cavity 301, and the second flat pipe body 322 is positioned away from the lower pipe 10. The first arc-shaped pipe body 311 and the second arc-shaped pipe body 321 are adjacent to each other, and the second flat pipe body 322 and the first flat pipe body 312 are adjacent to each other. Similarly, the shape of the second pipe section 32 is beneficial for further improving the load-bearing stability of the riser. The second arc-shaped pipe body 321 and the second flat pipe body 322 can be connected by means including but not limited to integral molding or welding.

[0033] In some embodiments, the support pipe 40 includes a third arc-shaped pipe body 41 and a third flat pipe body 42 that surround and form a cavity. Viewed along the diameter direction of the support pipe 40, the third arc-shaped pipe body 41 is laterally bent towards the first flat pipe body 312, and the third flat pipe body 42 is disposed away from the lower pipe 10. The structure of the support pipe facilitates further improvement of the supporting force of the support pipe 40, thereby further improving the load-bearing stability of the riser 40. The third arc-shaped pipe body 41 and the third flat pipe body 42 can be connected by means including but not limited to integral molding or welding.

[0034] In some embodiments, the third arc-shaped tube 41 is bent at an obtuse angle, and the bent portion is disposed adjacent to the first tube portion 31, so that the support tube 40, the first tube portion 31 and the connecting portion 21 form a triangular structure.

[0035] In some embodiments, refer to Figure 1 and Figure 2 The frame assembly also includes a chainring mount 11, which is connected to the bottom of the downtube 10. The chainring mount 11 is used to mount the bicycle chainring 96. The chainring mount 11 and the downtube 10 form a second obtuse angle structure. The connecting part 21 is supported by the chainring mount 11, and the support tube 40 is also connected to the chainring mount 11, thereby further improving the stability of the frame assembly. The support tube 40 can be connected to the chainring mount 11 by means including but not limited to welding or screw fixing. The chainring mount 11 can be connected to the downtube 10 by means including but not limited to welding or screw fixing.

[0036] This application also provides a bicycle assembly, which includes a frame assembly according to any of the above embodiments, with reference to... Figures 1 to 6The bicycle assembly also includes a rear rack 50, a rear fender 60, and a shock bar 70. The rear rack 50 is connected to the two forks 22 and includes a cargo seat 51, which can be used for seating a person or carrying cargo. The cargo seat 51 is located on the side of the rear wheel housing near the seat tube 30. The rear fender 60 is located on the side of the cargo seat 51 opposite to the chainstay 20. The rear fender 60 is curved toward the cargo seat 51 and is used to partially cover the rear wheel 93 of the bicycle. The rear fender 60 is connected to the rear rack 50 or the frame assembly. For example, the rear fender 60 can be connected to the rear rack 50 via a connecting strip 61. For example, the middle part of the connecting strip 61 is connected to the rear fender 60, and the two extended ends of the connecting strip 61 are each fixedly connected to different ends of the rear rack 50 by screws. The buffer rod 70 is connected to the frame assembly. For example, the buffer rod 70 can be connected to the gear plate mounting seat 11 of the frame assembly. For example, the gear plate mounting seat 11 can be provided with a buckle 111, and the buffer rod 70 can be provided with a locking hole 701. The buffer rod 70 is connected to the frame assembly by fixing it to the locking hole 701 via the buckle 111. The buffer rod 70 abuts against the curved inner end face of the rear fender 60. The buffer rod 70 is bent towards the rear fender 60. When the load seat 51 is driven downward by an external force to trigger the pressing of the rear fender 60, the buffer rod 70 can generate a recoverable deformation to provide support force, thereby improving the stability of the rear rack 50. When the carrier 51 is subjected to external force, the deformation of the rear clothes rack 50 can drive the carrier 51 to move downward.

[0037] In some embodiments, the projection of the buffer rod 70 is placed outside the carrier 51, which helps to improve the buffer response of the buffer rod 70 and facilitates the carrier 51 to be provided with multiple effective pressing points.

[0038] In some embodiments, refer to Figure 6 The inner curved end face of the buffer rod 70 forms a first groove 71. Viewed relative to the first groove 71, the left and right end faces of the buffer rod 70 each form a second groove 72. Both the first groove 71 and the second groove 72 extend along the bending direction of the buffer rod 70, exposing both ends of the buffer rod 70. Viewed relative to the depth of the first groove 71, the first groove 71 has left and right outer edges; viewed relative to the depth of the second groove 72, the second groove 72 also has left and right outer edges. This structural design of the buffer rod 70 helps to improve its strength and thus extend its service life.

[0039] In some embodiments, the rear rack 50 further includes a contact strip 52. Exemplarily, the number of contact strips 52 may be one or at least two (two contact strips 52 are shown in the figure). The contact strip 52 protrudes from the rear fender 60 onto the carrier 51. The contact strip 52 is used to press the rear fender 60 when the carrier 51 is driven downward by an external force. The contact strip 52 triggers the pressing of the rear fender 60, which helps to improve the cushioning adaptability while not causing adverse interference between the rear fender 60 and the rear wheel 93 of the bicycle.

[0040] In some embodiments, refer to Figure 2 and Figure 6 The contact bar 52 includes an arc-shaped portion 521 and a straight portion 522. The arc-shaped portion 521 is connected between the straight portion 522 and the carrier 51. For example, the arc-shaped portion 521 and the straight portion 522 can be integrally formed. The arc-shaped portion 521 can be connected to the carrier 51 by means including but not limited to welding. The straight portion 522 extends along the tangent direction of the curved outer end face of the rear mudguard 60, and the curved inner end face of the arc-shaped portion 521 is oriented towards or away from the riser 30. The shape of the contact bar 52 is beneficial for increasing the contact area and improving the load-bearing strength of the contact bar 52, thereby improving its service life.

[0041] In some embodiments, refer to Figures 1 to 3 The back hanger 50 also includes two support frames 53, each support frame 53 connected between a fork portion 22 and a carrier seat 51. For example, the support frames 53 can be connected to the carrier seat 51 by means including but not limited to welding. Each support frame 53 includes a first frame bar 531, a second frame bar 532, and a third frame bar 533. The first frame bar 531 includes a first strip portion 5311 and a second strip portion 5312 connected to form a third obtuse angle structure. For example, the first strip portion 5311 and the second strip portion 5312 can be connected by means including but not limited to integral molding or welding. The opening of the third obtuse angle structure faces... The riser 30 is configured such that the extension end of the first strip 5311 is connected to the carrier 51. For example, the first strip 5311 can be connected to the carrier 51 by means including but not limited to welding. The extension end of the second strip 5312 is connected to the fork 22. The second strip 5312 can be connected to the fork 22 by means including but not limited to screws. The second rack 532, the third rack 533, and the second strip 5312 are connected in a triangular structure. The second rack 532 and the third rack 533 are located on the side of the second strip 5312 opposite to the riser 30. The second rack 532 is supported by the fork 22. The structural configuration of the support frame 53 helps to improve the support stability of the rear clothes rack 50.

[0042] In some embodiments, the support frame 53 further includes a fourth support bar 534 and a fifth support bar 535. The fourth support bar 534 includes a third section 5341 and a fourth section 5342 connected to form a fourth obtuse angle structure. The third section 5341 and the fourth section 5342 can be connected by means including but not limited to integral molding or welding. The opening of the fourth obtuse angle structure is disposed away from the riser 30. Viewed from the fork 22 towards the carrier 51, the apex of the fourth obtuse angle structure is higher than the apex of the third obtuse angle structure. The extension end of the third section 5341 is connected to the carrier 51. The third section 5341 can be connected to the carrier 51 by means including but not limited to welding. The extension end of the fourth section 5342 is connected to the second section 5312. The fourth section 5342 can be connected to the second section 5312 by means including but not limited to welding. The fifth support bar 535 is connected between the first section 5311 and the third section 5341. The fifth support bar 535 can be connected to the first section 5311 and the third section 5341 by means including but not limited to welding. The fourth rack bar 534 and the fifth rack bar 535 help to further improve the support stability of the back hanger.

[0043] This application also provides a bicycle, which includes the frame assembly of any of the above embodiments.

[0044] This application also provides a bicycle, which includes the bicycle components of any of the above embodiments.

[0045] It is understood that the bicycle provided in this application also includes a saddle 91, a seatpost 92, a rear wheel 93, handlebars 94, a front fork 95, a front wheel 951, a chainring 96, a freewheel 97, a drive chain 98, and a crank 99. The saddle 91 is mounted on the second tube section 32 via the seatpost 92. The rear wheel 93 is located in the rear wheel housing and connected to the fork section 22. The handlebars 94 are connected to the front fork 95, and both are connected to the end of the downtube 10 away from the rear chainstay 20. The rotation of the handlebars 94 relative to the downtube 10 can drive the front fork 95 to rotate. The front wheel 951 is connected to the front fork 95. The chainring 96 is mounted on the frame assembly near the connection part. For example, the chainring 96 is mounted on the chainring mount 11 of the frame assembly. The chainring 96 drives the freewheel 97 to rotate via the drive chain 98, causing the rear wheel 93, which is connected to the freewheel 97, to rotate. The crank 99 is used for the user to pedal to drive the chainring 96 to rotate. These basic components are all standard bicycle components, so their specific construction will not be described in detail.

[0046] In some embodiments, the bicycle is an electric-assisted bicycle, that is, the wheels are rotated by a motor driving the sprocket 96 or the freewheel. (Refer to...) Figure 1 and Figure 2The lower tube 10 has a recessed end face facing away from the clearance cavity 301 to form a battery housing groove. The bicycle also includes a battery cover 80, which is snapped into the battery housing groove, and the two together form a battery housing cavity. The battery housing cavity is used to install the battery assembly that powers the drive motor. The edge of the battery cover has an opening groove 81 for the user to pry open the battery cover 80. The battery housing groove is positioned so that after the battery cover 80 is opened, the battery assembly naturally hangs down under the influence of gravity, thus facilitating the user to remove the battery. For example, the motor can be housed in the gear sprocket mounting base 11.

[0047] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A frame assembly for a bicycle, comprising a downtube, chainstays, and seat tube, characterized in that, The frame assembly is defined as being in the use state when mounted on an upright wheel. In the use state, the chainstay is laid horizontally and the downtube is tilted upward and forward relative to the chainstay to form a first obtuse angle structure. The chainstay includes a connecting part and two fork parts spaced apart from each other. The rear end of the connecting part is connected to the front end of the two fork parts to form a rear wheel housing cavity. The front end of the connecting part is connected to the bottom of the downtube. The seat tube is located between the chainstay and the downtube. The seat tube is bent to form a first tube section and a second tube section that enclose a second obtuse angle structure. The opening of the second obtuse angle structure faces the downtube. The first tube section is connected to the downtube at the portion adjacent to the connecting part. The second tube section is inclined upward and backward relative to the connecting part. The first tube section, the second tube section, and the downtube enclose a clearance cavity. The clearance cavity has an opening that faces away from the chainstay. The clearance cavity is used for the user to straddle the left and right sides of the frame assembly to get on and off the vehicle. The second tube section is used to install the seat. The frame assembly also includes a support tube, which is connected to the first tube portion and the connecting portion, so that the three form a triangular structure or a triangular-like structure.

2. The frame assembly as described in claim 1, characterized in that, Viewed from the fork towards the connecting part, the support tube and the connecting part are set at an acute angle.

3. The frame assembly as described in claim 1 or 2, characterized in that, The first tube section includes a first arc-shaped tube body and a first flat tube body that surround and form a cavity. When viewed along the diameter direction of the first tube section, the first arc-shaped tube body is laterally bent towards the clearance cavity, and the first flat tube body is disposed towards the connecting part. The support tube is connected to the first flat tube body.

4. The frame assembly as described in claim 3, characterized in that, The second tube section includes a second arc-shaped tube body and a second flat tube body that surround and form a cavity. When viewed along the diameter direction of the second tube section, the second arc-shaped tube body is laterally bent towards the clearance cavity, and the second flat tube body is disposed away from the lower tube. The first arc-shaped tube body and the second arc-shaped tube body are adjacent to each other, and the second flat tube body and the first flat tube body are adjacent to each other.

5. The frame assembly as described in claim 3, characterized in that, The support tube includes a third arc-shaped tube body and a third flat tube body that surround and form a cavity. When viewed along the diameter direction of the support tube, the third arc-shaped tube body is laterally bent towards the first flat tube body, and the third flat tube body is positioned away from the lower tube.

6. The frame assembly as described in claim 5, characterized in that, The third arc-shaped tube is bent at an obtuse angle, with the bent portion located adjacent to the first tube section, so that the support tube, the first tube section, and the connecting portion form a triangular-like structure.

7. The frame assembly as described in claim 1, characterized in that, Also includes: A chainring mount is connected to the bottom of the downtube. The chainring mount is used to mount the chainring of the bicycle. The chainring mount and the downtube form a second obtuse angle structure. The connecting part is supported by the chainring mount. The support tube is also connected to the chainring mount.

8. A bicycle component, characterized in that, The bicycle assembly includes the frame assembly as described in any one of claims 1 to 7, and the bicycle assembly further includes: A rear coat rack is connected to the two forks. The rear coat rack includes a support seat, which is located on the side of the rear wheel accommodating cavity near the riser. A rear fender, located on the side of the load seat opposite the chainstay, is curved toward the load seat and partially covers the rear wheel of the bicycle. The rear fender is connected to the rear rack or the frame assembly. A buffer rod is connected to the frame assembly. The buffer rod abuts against the curved inner end face of the rear fender. The buffer rod is bent toward the rear fender. The projection of the buffer rod is placed outside the cargo seat. The buffer rod is used to generate recoverable deformation to provide support when the cargo seat is driven downward by an external force to trigger the pressing of the rear fender.

9. The bicycle assembly as claimed in claim 8, characterized in that, The inner curved end face of the buffer rod is recessed to form a first groove. When viewed relative to the first groove, the left and right end faces of the buffer rod are each recessed to form a second groove. Both the first groove and the second groove extend along the bending direction of the buffer rod, so that both the first groove and the second groove are exposed at the two extended ends of the buffer rod. When viewed relative to the groove depth direction of the first groove, the first groove has left and right outer edges. When viewed relative to the groove depth direction of the second groove, the second groove also has left and right outer edges.

10. The bicycle assembly as claimed in claim 8, characterized in that, The back hanger also includes: A contact strip protrudes from the rear mudguard onto the cargo seat. The contact strip is used to press the rear mudguard when the cargo seat is driven downward by an external force. The contact strip includes an arc-shaped portion and a straight portion. The arc-shaped portion is connected between the straight portion and the cargo seat. The straight portion extends along the tangent direction of the curved outer end face of the rear mudguard. The curved inner end face of the arc-shaped portion is oriented towards or away from the riser.

11. The bicycle assembly as claimed in claim 8, characterized in that, The back rack also includes two support frames, each of which is connected between a fork and the cargo seat. Each support frame includes a first frame bar, a second frame bar, and a third frame bar. The first frame bar includes a first section and a second section connected to form a third obtuse angle structure. The opening of the third obtuse angle structure faces the riser. The extension end of the first section is connected to the load base, and the extension end of the second section is connected to the fork. The second frame bar, the third frame bar, and the second section are connected in a triangular structure. The second frame bar and the third frame bar are located on the side of the second section away from the riser. The second frame bar is supported by the fork.

12. The bicycle assembly as claimed in claim 11, characterized in that, The support frame also includes: The fourth frame bar includes a third section and a fourth section connected to form a fourth obtuse angle structure. The opening of the fourth obtuse angle structure is disposed away from the riser. Viewed from the fork towards the load base, the vertex of the fourth obtuse angle structure is higher than the vertex of the third obtuse angle structure. The extension end of the third section is connected to the load base, and the extension end of the fourth section is connected to the second section. The fifth strip connects the first strip and the third strip.

13. A bicycle, characterized in that, The bicycle includes a frame assembly as described in any one of claims 1 to 7.

14. A bicycle, characterized in that, The bicycle includes the bicycle assembly as described in any one of claims 8 to 14.

15. The bicycle as claimed in claim 14, characterized in that, The bicycle is an electric-assisted bicycle. The end face of the downtube facing away from the clearance cavity is recessed to form a battery receiving groove. The bicycle also includes a battery cover, which is snapped into the battery receiving groove and the two together form a battery receiving cavity. The battery receiving cavity is used to install a battery assembly that supplies power to the drive motor. The edge of the battery cover is provided with an opening groove, which is used for the user to pry open the battery cover.

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