Boosting bicycle manufactured based on die casting and liquid die forging

Abstract

The invention relates to the technical field of moped bicycles, and discloses a moped bicycle manufactured based on die casting and liquid die forging, which comprises a front half frame body integrally formed by magnesium alloy die casting and a rear half frame body integrally formed by liquid die forging, a front fork frame of the front frame is connected with a front wheel, and the rear frame is connected with a rear wheel; the rear end of the front frame is provided with side blocks and forms a hinged interval, the front end of the rear frame is provided with a middle block, the middle block and the side blocks form a hinged position, and a hinged shaft penetrates through the middle block; a circumferential elastic structure is arranged between the middle block and the hinge shaft, and a longitudinal elastic structure is arranged between the middle block and the side block; the hinged positions are provided with elastic intervals and connected with shock absorbers, the shock absorbers are connected with the front frame and the rear frame, and the shock absorbers are obliquely arranged downwards in the front-back direction of the shock absorbers. The semi-frame body is integrally formed and manufactured through magnesium alloy die casting and liquid die forging, so that the semi-frame body is complete in structure and high in strength, stable connection can be guaranteed, and strength and durability are enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power-assisted bicycles, in particular to a power-assisted bicycle manufactured based on die casting and liquid die forging. BACKGROUND

[0002] With the enhancement of people's environmental awareness and the demand for convenient travel, power-assisted bicycles have gradually become one of the important transportation tools for short-distance travel.

[0003] The power-assisted bicycle has a frame, which serves as the main frame of the entire power-assisted bicycle and plays a supporting role.

[0004] In the prior art, many power-assisted bicycle frames are connected by welding or bolts: on the one hand, during the welding process, if the parameters are not properly controlled or the materials are not well matched, welding defects are easily produced, which will become stress concentration sources and reduce the connection strength. When encountering complex road conditions, the frame is unevenly stressed, and cracks or even fractures may occur at the welded parts, affecting the safety of riding;

[0005] On the other hand, bolt connections are prone to looseness due to vibration during long-term use, resulting in a decrease in the overall rigidity of the frame and affecting the control stability and safety of the vehicle;

[0006] In addition, in order to achieve lightweight, some frames use lightweight materials with lower strength, but there are challenges in ensuring the overall strength and rigidity of the frame. Moreover, in the existing assembly connection design of the frame, the problem of buffering and shock absorption is not fully considered. When the vehicle is heavily loaded or subjected to a large impact force, the connection parts of the frame are prone to deformation or damage, which cannot meet the use requirements of power-assisted bicycles under various working conditions. SUMMARY

[0007] The purpose of the present application is to provide a power-assisted bicycle manufactured based on die casting and liquid die forging, which aims to solve the problem of insufficient assembly connection strength of the frame of the power-assisted bicycle in the prior art.

[0008] The present application is realized as follows: a power-assisted bicycle manufactured based on die casting and liquid die forging includes a front frame and a rear frame, the front frame includes two front half-frame bodies integrally formed by magnesium alloy die casting, the two front half-frame bodies are assembled towards each other to form the front frame, the rear frame includes two rear half-frame bodies integrally formed by liquid die forging, and the two rear half-frame bodies are assembled towards each other to form the rear frame.

[0009] The front end of the front frame is connected with a front fork frame, the front fork frame is connected with a front wheel, the rear end of the rear frame is connected with a rear wheel; the rear end of the front frame has two opposite side blocks, a hinged interval is formed between the two side blocks, the front end of the rear frame has a middle block, the middle block is inserted into the hinged interval and is clamped by the two side blocks, and the middle block is hinged with the two side blocks to form a hinge position;

[0010] A hinge shaft is arranged in the hinge position and penetrates the two side blocks and the middle block, so that the middle block is arranged in a hinged manner between the two side blocks; a circumferential elastic structure is arranged between the middle block and the hinge shaft, and the circumferential elastic structure elastically buffers the circumferential rotation between the middle block and the hinge shaft; a longitudinal elastic structure is arranged between the middle block and the side blocks, and the longitudinal elastic structure elastically buffers the relative dislocation movement between the middle block and the side blocks;

[0011] The upper portion of the hinge position is provided with front and rear elastic intervals arranged in an interval manner, and the elastic intervals are formed between the front frame and the rear frame; a shock absorber is connected to the elastic intervals, the front end of the shock absorber is connected to the front frame, the rear end of the shock absorber is connected to the rear frame, and the shock absorber is arranged in an inclined manner downward along the direction from the front end to the rear end of the shock absorber.

[0012] Further, a rotating shaft is arranged at the rear end of the front frame and located below the hinge position; a front gear disc is connected to the rotating shaft, a foot pedal is arranged on the front gear disc, and the foot pedal drives the front gear disc to rotate.

[0013] Further, a rear gear disc is arranged on the rear wheel, the rear gear disc and the front gear disc are connected through a chain, and a motor that drives the rear gear disc to rotate is arranged on the rear wheel.

[0014] Further, a longitudinal clamping interval is formed in the rear frame, and the clamping interval is formed between the two rear half frame bodies; the rear wheel is movably embedded in the clamping interval and is hinged with the two rear half frame bodies, respectively, and the motor is arranged in the clamping interval.

[0015] Further, the rear portion of the rear frame has a rear end section, the front portion of the rear frame has a front end section, the rear end section and the front end section are bent and connected, the clamping interval is formed in the rear end section, and the middle block is formed at the end of the front end section; a support frame is connected to the rear end section and located above the rear frame.

[0016] Further, a bending position is formed between the rear end section and the front end section, the bending position protrudes towards the elastic interval and forms a rear protruding block, the front frame protrudes towards the elastic interval and forms a front protruding block, one end of the shock absorber is connected to the rear protruding block, and the other end of the shock absorber is connected to the front protruding block.

[0017] Further, the front frame has an inclined rod, two side blocks are formed at the ends of the inclined rod; the inclined rod has an inner cavity with a bottom opening, the inner cavity is arranged along the length direction of the inclined rod, and a detachable battery is arranged in the inner cavity.

[0018] Further, the front frame has a cross beam rod, the front end of the cross beam rod is connected with the front end of the inclined rod as a whole to form an inclined front end head; a central shaft is protruded on the front fork frame, the central shaft is rotatably arranged in the front end head, and a handle frame for controlling the rotation of the central shaft is connected to the central shaft;

[0019] The rear end of the cross beam rod forms a suspended rear end head, and an adjustable height seat is connected to the rear end head; a support rod is arranged between the cross beam rod and the inclined rod, the support rod is arranged in an inclined manner, and the elastic interval is formed between the support rod and the front end section.

[0020] Further, the support rod, the cross beam rod and the inclined rod form an enclosed cavity in a closed arrangement, the front part of the enclosed cavity is filled with an inner support plate, the inner support plate encloses the front part of the enclosed cavity, the top of the inner support plate is sequentially connected to the cross beam rod from bottom to top, and the bottom of the inner support plate is sequentially connected to the inclined rod from top to bottom; the rear part of the enclosed cavity is arranged in a hollow manner.

[0021] Further, a middle hole is arranged in the middle block, and the articulated shaft is movably arranged through the middle hole; the two ends of the articulated shaft are respectively arranged through the side blocks and are fixedly connected with the side blocks; the circumferential elastic structure comprises an elastic annular cylinder, the inner side of the annular cylinder is fixedly connected with the articulated shaft, and the outer side of the annular cylinder is fixedly connected with the inner side wall of the middle hole;

[0022] The inner part of the annular cylinder has an annular spring, the annular spring is arranged in a spiral manner along the circumference of the annular cylinder, and when the middle hole rotates relative to the articulated shaft in the circumferential direction, the annular cylinder and the annular spring are synchronously elastically twisted and deformed;

[0023] The two sides of the middle block have outer side walls, and the side blocks have inner side walls facing the outer side walls; the longitudinal elastic structure comprises an elastic longitudinal layer, the outer side of the longitudinal layer is fixedly connected with the inner side walls, and the inner side of the longitudinal layer is fixedly connected with the outer side walls;

[0024] A plurality of hard columns arranged in a transverse direction are arranged in the longitudinal layer, the plurality of hard columns are arranged in a circumferential interval around the articulated shaft, the outer ends of the hard columns are arranged in an interval between the inner side walls, and the inner ends of the hard columns are arranged in an interval between the outer side walls.

[0025] Compared with the prior art, the power-assisted bicycle provided by the present invention, which is manufactured based on die casting and liquid die forging, adopts magnesium alloy die casting and liquid die forging integrated molding technology. When manufacturing the half-frames of the front and rear frames, it can ensure that each half-frame has high strength and good structural integrity.

[0026] The hinged connection between the front and rear frames, combined with the circumferential and longitudinal elastic structures, allows the frame connections to maintain a stable connection while effectively buffering and absorbing impact and vibration in all directions during riding, preventing loosening or fatigue damage caused by long-term vibration, thereby enhancing the strength and durability of the power-assisted bicycle frame assembly connection.

[0027] Furthermore, the shock absorbers, which are spaced apart in the front and rear and tilted downward, cooperate with the elastic spacers to further optimize the shock absorption performance of the frame, ensure the stability of the vehicle during driving, improve the riding comfort and safety, and also help solve the problem of insufficient assembly connection strength of the power-assisted bicycle frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional schematic diagram of a power-assisted bicycle manufactured based on die casting and liquid die forging provided by the present invention;

[0029] Figure 2 It is a three-dimensional schematic diagram of the connection between the front frame and the rear frame provided by the present invention;

[0030] Figure 3 It is a partial cross-sectional schematic diagram of the longitudinal layer provided by the present invention;

[0031] Figure 4 It is a partial cross-sectional schematic diagram of the middle block provided by the present invention;

[0032] Figure 5 It is a schematic diagram of the structure of the middle block and the longitudinal layer provided by the present invention;

[0033] In the figure: front frame 100, front fork 101, front wheel 102, side block 103, hinge spacer 104, elastic spacer 105, shock absorber 106, front gear plate 107, foot pedal 108;

[0034] Rear frame 200, rear half frame 201, rear wheel 202, rear gear plate 203, clamping spacer 204, support frame 205, rear protrusion 206, front protrusion 207;

[0035] Tilt rod 300, crossbeam 301, front end head 302, central axis 303, handle frame 304, rear end head 305, enclosed cavity 306, inner support plate 307;

[0036] Middle block 400, middle hole 401, annular cylinder 402, annular spring 403, outer side wall 404, inner side wall 405, longitudinal layer 406, hard column 407. DETAILED DESCRIPTION

[0037] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0038] The implementation of the present application will be described in detail below with reference to specific embodiments.

[0039] The same or similar reference numerals in the drawings of the embodiments correspond to the same or similar components; in the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the positional relationship in the drawings are only used for exemplary illustration, and cannot be understood as a limitation of the present patent, for those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0040] Referring to Figures 1-5 , a preferred embodiment provided by the present application is shown.

[0041] The power-assisted bicycle manufactured based on die casting and liquid die forging includes a front frame 100 and a rear frame 200, the front frame 100 includes two front half frame bodies integrally formed by magnesium alloy die casting, the two front half frame bodies are assembled towards each other to form the front frame 100, the rear frame 200 includes two rear half frame bodies 201 integrally formed by liquid die forging, the two rear half frame bodies 201 are assembled towards each other to form the rear frame 200;

[0042] The front end of the front frame 100 is connected with a front fork frame 101, the front fork frame 101 is connected with a front wheel 102, the rear end of the rear frame 200 is connected with a rear wheel 202, the rear end of the front frame 100 has two side blocks 103 arranged towards each other, a hinge interval 104 is formed between the two side blocks 103, the front end of the rear frame 200 has a middle block 400, the middle block 400 is inserted into the hinge interval 104 and clamped by the two side blocks 103 towards each other, and the middle block 400 is hinged with the two side blocks 103 to form a hinge position;

[0043] The hinge position is provided with a hinge shaft, the hinge shaft passes through the two side blocks 103 and the middle block 400, so that the middle block 400 is hingedly arranged with the two side blocks 103; a circumferential elastic structure is arranged between the middle block 400 and the hinge shaft, and the circumferential elastic structure elastically buffers the circumferential rotation between the middle block 400 and the hinge shaft; a longitudinal elastic structure is arranged between the middle block 400 and the side block 103, and the longitudinal elastic structure elastically buffers the relative dislocation movement between the middle block 400 and the side block 103.

[0044] The hinge position is provided with a hinge shaft, the hinge shaft passes through the two side blocks 103 and the middle block 400, so that the middle block 400 is hingedly arranged with the two side blocks 103; a circumferential elastic structure is arranged between the middle block 400 and the hinge shaft, and the circumferential elastic structure elastically buffers the circumferential rotation between the middle block 400 and the hinge shaft; a longitudinal elastic structure is arranged between the middle block 400 and the side block 103, and the longitudinal elastic structure elastically buffers the relative dislocation movement between the middle block 400 and the side block 103.

[0045] The above-mentioned power-assisted bicycle manufactured based on die casting and liquid die forging adopts magnesium alloy die casting and liquid die forging integrated molding technology, and when the half-frame bodies of the front frame 100 and the rear frame 200 are manufactured, each half-frame body can ensure high strength and good structural integrity;

[0046] Through the hinge arrangement between the front frame 100 and the rear frame 200, in combination with the circumferential elastic structure and the longitudinal elastic structure, the frame connection can not only maintain stable connection, but also effectively buffer and absorb impact force and vibration in all directions generated during riding, so as to avoid connection loosening or fatigue damage caused by long-term vibration, thereby enhancing the strength and durability of the power-assisted bicycle frame assembly connection;

[0047] In addition, the shock absorber 106 arranged in front of and behind and inclined downward cooperates with the elastic interval 105, further optimizes the shock absorption performance of the frame, ensures the stability of the vehicle during driving, improves the comfort and safety of riding, and also helps to solve the problem of insufficient strength of the power-assisted bicycle frame assembly connection.

[0048] In the embodiment, the rear end of the front frame 100 is provided with a rotating shaft, and the rotating shaft is located below the hinge position; the rotating shaft is connected with a front gear disc 107, the front gear disc 107 is provided with a pedal 108, and the pedal 108 drives the front gear disc 107 to rotate.

[0049] By arranging the rotating shaft and the front gear disc 107, the rider can drive the front gear disc 107 to rotate by means of the pedal 108, and then drive the rear wheel 202 to rotate through the chain transmission, so as to realize the human-powered driving function, improve the controllability and flexibility of the vehicle, and meet the riding needs under different road conditions.

[0050] In the embodiment, the rear wheel 202 is provided with a rear gear disc 203, and the rear gear disc 203 is connected with the front gear disc 107 through a chain. The rear wheel 202 is provided with a motor for driving the rear gear disc 203 to rotate.

[0051] The chain cooperation can efficiently transmit power, and the chain connection is simple and reliable, easy to maintain. In addition, the configuration of the motor can assist or replace manual driving, so as to rotate the rear gear disc 203, provide additional power support for the vehicle, reduce the burden of the rider, especially when climbing or long-distance riding, enhance the power assistance effect, and improve the riding experience.

[0052] In the embodiment, the rear frame 200 is formed with a longitudinal through clamping interval 204, and the clamping interval 204 is formed between the two rear half frame bodies 201. The rear wheel 202 is movably embedded in the clamping interval 204 and is hingedly connected with the two rear half frame bodies 201 respectively. The motor is arranged in the clamping interval 204.

[0053] In this way, the clamping interval 204 not only provides a stable mounting space for the rear wheel 202, but also allows the rear wheel 202 to move within a certain range, cooperates with the hinged structure, and makes the rear wheel 202 flexible to adapt to different road conditions. The motor arranged in the clamping interval 204 makes the layout compact, saves space, reduces the interference of the outside to the motor, ensures the stable operation of the motor, and provides continuous power for the vehicle.

[0054] In the embodiment, the rear part of the rear frame 200 has a rear end section, the front part of the rear frame 200 has a front end section, the rear end section is bent and connected with the front end section, the clamping interval 204 is formed in the rear end section, and the middle block 400 is formed at the end of the front end section. The rear end section is connected with a support frame 205, and the support frame 205 is located above the rear frame 200.

[0055] By bending and connecting the rear end section with the front end section, a stable frame structure can be formed. In addition, the support frame 205 is connected to the rear end section, which further enhances the structural strength of the rear frame 200, so that it can withstand various loads during vehicle driving, ensures the overall stability of the frame, and provides a mounting basis for other components of the vehicle, ensuring the normal operation of the vehicle.

[0056] In the embodiment, a bending position is formed between the rear end section and the front end section, the bending position protrudes towards the elastic interval 105, and a rear protruding block 206 is formed. The front frame 100 protrudes towards the elastic interval 105, and a front protruding block 207 is formed. One end of the shock absorber 106 is connected with the rear protruding block 206, and the other end of the shock absorber 106 is connected with the front protruding block 207.

[0057] In this way, the rear protrusion 206 and the front protrusion 207 provide suitable connection points for the shock absorber 106 at the same time, and can effectively buffer the vibration generated by the vehicle during driving, especially on bumpy roads, reduce the impact of vibration on the frame connection, and reduce the risk of loose connection, thereby improving the strength and stability of the assembly connection of the power-assisted bicycle frame and enhancing the comfort and safety of riding.

[0058] In this embodiment, the front frame 100 has a tilt rod 300, and two side blocks 103 are formed at the ends of the tilt rod 300; the tilt rod 300 has an inner cavity with a bottom opening, which extends along the length direction of the tilt rod 300 and is provided with a detachable battery.

[0059] The tilt rod 300 provides the front frame 100 with reasonable strength and rigidity. The side blocks 103 provide support and connection functions for its ends. The inner cavity facilitates the installation and removal of the battery, and the bottom opening design is beneficial to the heat dissipation and maintenance of the battery, ensuring stable power supply of the battery, meeting the energy requirements of the vehicle power assist system, and extending the battery life.

[0060] In this embodiment, the front frame 100 has a crossbeam 301. The front end of the crossbeam 301 is integrally connected to the front end of the tilting rod 300 to form an inclined front end head 302. A central shaft 303 is protruding from the front fork frame 101. The central shaft 303 is rotatably inserted into the front end head 302. The central shaft 303 is connected to a handle frame 304 for controlling the rotation of the central shaft 303.

[0061] A rear end head 305 arranged in suspension is formed at the rear end of the crossbeam 301, and a height-adjustable seat is connected to the rear end head 305; a support rod is provided between the crossbeam 301 and the tilt rod 300, and the support rod is arranged tilted, forming an elastic gap 105 between the support rod and the front end section.

[0062] On the one hand, the crossbar 301 is connected to the tilt bar 300 to form a stable front end 302, which provides a firm support for the central axis 303 and the handle frame 304, ensuring the steering flexibility and stability of the vehicle;

[0063] On the other hand, the suspended setting of the rear end head 305 and the adjustable seat can meet the comfort needs of different riders, and the elastic gap 105 formed between the support rod and the front end section can buffer some vibrations and further improve riding comfort.

[0064] In this embodiment, the support rod, the cross beam rod 301 and the inclined rod 300 form a closed surrounding cavity 306, the front part of the surrounding cavity 306 is filled with an inner support plate 307, the inner support plate 307 closes the front part of the surrounding cavity 306, the top of the inner support plate 307 is connected to the cross beam rod 301 from bottom to top, and the bottom of the inner support plate 307 is connected to the inclined rod 300 from top to bottom; the rear part of the surrounding cavity 306 is arranged in a hollow manner.

[0065] The overall structural strength of the front frame 100 is enhanced by the surrounding cavity 306, and the inner support plate 307 fills the front part to provide internal support for the cross beam rod 301 and the inclined rod 300, thereby improving the load capacity of the connection;

[0066] The rear part is hollow, which not only reduces the weight of the frame, but also retains the necessary structural integrity, balances light weight and strength, and helps to improve the handling performance of the vehicle.

[0067] In this embodiment, the middle block 400 is provided with a middle hole 401, and the hinge shaft passes through the middle hole 401; the two ends of the hinge shaft pass through the side block 103 and are fixedly connected with the side block 103; the circumferential elastic structure includes an elastic annular cylinder 402, the inner side of the annular cylinder 402 is fixedly connected with the hinge shaft, and the outer side of the annular cylinder 402 is fixedly connected with the inner side wall of the middle hole 401;

[0068] The annular cylinder 402 has an annular spring 403 inside, and the annular spring 403 is arranged in a spiral manner along the circumference of the annular cylinder 402; when the middle hole 401 rotates relative to the hinge shaft, the annular cylinder 402 and the annular spring 403 are synchronously elastically twisted and deformed;

[0069] The two sides of the middle block 400 have outer side walls 404, and the side block 103 has inner side walls 405 facing the outer side walls 404; the longitudinal elastic structure includes an elastic longitudinal layer 406, the outer side of the longitudinal layer 406 is fixedly connected with the inner side wall 405, and the inner side of the longitudinal layer 406 is fixedly connected with the outer side wall 404;

[0070] The longitudinal layer 406 is provided with a plurality of hard columns 407 arranged transversely, the plurality of hard columns 407 are arranged in a spiral manner along the circumference of the hinge shaft, the outer ends of the hard columns 407 are arranged at intervals between the inner side walls 405, and the inner ends of the hard columns 407 are arranged at intervals between the outer side walls 404.

[0071] The middle block 400 and the side block 103 are connected through the middle hole 401 and the hinge shaft, and combined with the circumferential elastic structure and the longitudinal elastic structure, to form a stable and elastic connection;

[0072] The annular cylinder 402 and the annular spring 403 in the circumferential elastic structure can buffer the circumferential relative rotation between the middle block 400 and the articulated shaft, and reduce the circumferential impact force caused by vibration; the longitudinal layer 406 in the longitudinal elastic structure cooperates with the hard column 407, and can elastically buffer the longitudinal relative dislocation movement between the middle block 400 and the side block 103, avoid the damage of the connection caused by vibration in the vehicle driving, effectively improve the strength and durability of the assembled connection of the frame of the power-assisted bicycle, and ensure the driving stability of the vehicle under complex road conditions.

[0073] The above merely describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A power-assisted bicycle manufactured by die casting and liquid die forging, characterized in that: The vehicle comprises a front frame and a rear frame, wherein the front frame comprises two front half-frames integrally formed by magnesium alloy die-casting, and the two front half-frames are assembled facing each other to form the front frame; the rear frame comprises two rear half-frames integrally formed by liquid die forging, and the two rear half-frames are assembled facing each other to form the rear frame; The front end of the front frame is connected to a front fork frame, the front fork frame is connected to a front wheel, and the rear end of the rear frame is connected to a rear wheel; the rear end of the front frame has two side blocks arranged opposite to each other, and a hinge interval is formed between the two side blocks; the front end of the rear frame has a middle block, the middle block is inserted into the hinge interval, and is clamped by the two side blocks facing each other, and the middle block is hinged to the two side blocks to form a hinge position; A hinge shaft is provided in the hinged portion, and the hinge shaft passes through the two side blocks and the middle block respectively, so that the middle block and the two side blocks are hingedly arranged; a circumferential elastic structure is provided between the middle block and the hinge shaft, and the circumferential elastic structure elastically buffers the circumferential rotation between the middle block and the hinge shaft; a longitudinal elastic structure is provided between the middle block and the side blocks, and the longitudinal elastic structure elastically buffers the relative misalignment movement between the middle block and the side blocks; There is an elastic spacer arranged in a front-to-back manner above the hinge position, and the elastic spacer is formed between the front frame and the rear frame; the elastic spacer is connected to the shock absorber, the front end of the shock absorber is connected to the front frame, and the rear end of the shock absorber is connected to the rear frame. Along the direction of the shock absorber from front to back, the shock absorber is arranged tilted downward.

2. The power-assisted bicycle manufactured by die casting and liquid die forging according to claim 1, characterized in that: A rotating shaft is passed through the rear end of the front frame, and the rotating shaft is located below the hinge position; the rotating shaft is connected to a front gear plate, and a foot pedal is provided on the front gear plate, and the foot pedal drives the front gear plate to rotate.

3. The power-assisted bicycle manufactured by die casting and liquid die forging as claimed in claim 2, characterized in that: The rear wheel is provided with a rear gear plate, the rear gear plate is connected to the front gear plate through a chain, and the rear wheel is provided with a motor for driving the rear gear plate to rotate.

4. The power-assisted bicycle manufactured by die casting and liquid die forging as claimed in claim 3, characterized in that: A longitudinally penetrating clamping space is formed in the rear frame, and the clamping space is formed between the two rear half-frame bodies; the rear wheels are movably embedded in the clamping space and are respectively hinged to the two rear half-frame bodies, and the motor is placed in the clamping space.

5. The power-assisted bicycle manufactured by die casting and liquid die forging according to any one of claims 1 to 4, characterized in that: The rear portion of the rear frame has a rear end section, and the front portion of the rear frame has a front end section. The rear end section and the front end section are bent and connected to each other. The clamping gap is formed in the rear end section, and the middle block is formed at the end of the front end section. A support frame is connected to the rear end section, and the support frame is located above the rear frame.

6. The power-assisted bicycle manufactured by die casting and liquid die forging as claimed in claim 5, characterized in that: A bending portion is formed between the rear end section and the front end section, and the bending portion protrudes toward the elastic interval to form a rear protrusion; the front frame protrudes toward the elastic interval to form a front protrusion, one end of the shock absorber is connected to the rear protrusion, and the other end of the shock absorber is connected to the front protrusion.

7. The power-assisted bicycle manufactured by die casting and liquid die forging according to any one of claims 1 to 4, characterized in that: The front frame has a tilting rod, and the two side blocks are formed at the ends of the tilting rod; the tilting rod has an inner cavity with a bottom opening, the inner cavity extends along the length direction of the tilting rod, and a detachable battery is provided in the inner cavity.

8. The power-assisted bicycle manufactured by die casting and liquid die forging according to any one of claims 1 to 4, characterized in that: The front frame has a crossbeam, the front end of which is integrally connected to the front end of the tilting rod to form an inclined front end head; a central shaft is protruding from the front fork frame, the central shaft is rotatably inserted into the front end head, and a handle frame for controlling the rotation of the central shaft is connected to the central shaft; A suspended rear end head is formed at the rear end of the crossbeam, and a height-adjustable seat is connected to the rear end head; a support rod is provided between the crossbeam and the tilt rod, and the support rod is tilted to form the elastic gap between the support rod and the front end section.

9. The power-assisted bicycle manufactured by die casting and liquid die forging according to claim 8, characterized in that: The support rods, crossbeam rods and inclined rods enclose a closed enclosed cavity, the front of the enclosed cavity is filled with an inner support plate, the inner support plate closes the front of the enclosed cavity, the top of the inner support plate is connected to the crossbeam rod from bottom to top, and the bottom of the inner support plate is connected to the inclined rod from top to bottom; the rear of the enclosed cavity is hollowed out.

10. The power-assisted bicycle manufactured by die casting and liquid die forging according to any one of claims 1 to 4, characterized in that: The central block is provided with a central hole, and the hinge shaft movably passes through the central hole; both ends of the hinge shaft pass through the side blocks respectively and are fixedly connected to the side blocks; the circumferential elastic structure includes an elastic annular cylinder, the inner side of the annular cylinder is fixedly connected to the hinge shaft, and the outer side of the annular cylinder is fixedly connected to the inner side wall of the central hole; The annular cylinder has an annular spring inside, which is arranged spirally along the circumference of the annular cylinder. When the central hole rotates circumferentially relative to the hinge shaft, the annular cylinder and the annular spring are elastically twisted and deformed synchronously. The middle block has outer side walls on both sides, and the side blocks have inner side walls facing the outer side walls; the longitudinal elastic structure includes an elastic longitudinal layer, the outer side of the longitudinal layer is fixedly connected to the inner side wall, and the inner side of the longitudinal layer is fixedly connected to the outer side wall; The longitudinal layer is provided with a plurality of transversely arranged hard columns, which are arranged around the circumference of the hinge axis at intervals, with the outer ends of the hard columns spaced apart from the inner side walls, and the inner ends of the hard columns spaced apart from the outer side walls.

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