Frame capable of being used for two-wheeled vehicle or three-wheeled vehicle

Abstract

The frame comprises a frame body, a supporting pipe, a lower fork and an upper fork are arranged at the right end of the frame body, the left end of the upper fork is fixedly connected with the upper end of the supporting pipe, and the lower fork and the upper fork are each of a Y-shaped structure with an opening facing the right side. The right ends of the two lower fork arms of the lower fork and the right ends of the two upper fork arms of the upper fork are correspondingly and fixedly arranged on the two hook claws located on the front side and the rear side, a first U-shaped groove with an opening facing the right side is formed in each hook claw, and a zipper device used for adjusting the fixed position of the end of a rear wheel axle or the end of a motor shaft fixedly arranged in the first U-shaped groove in a penetrating mode is installed in the first U-shaped groove. And a plurality of mounting holes are further formed in the hook claws. According to the frame disclosed by the utility model, the types of frames and required mold tools can be reduced, so that the production cost can be reduced; the operation steps are simple when a two-wheeled vehicle or a three-wheeled vehicle is assembled; the chain tightness adjusting steps of the assembled two-wheeled vehicle and the assembled three-wheeled vehicle are easy to operate, and the chain tightness adjusting mechanism is simple in design, high in preparation and implementation feasibility and high in practicability.

Description

Technical Field

[0001] The utility model relates to the technical field of transportation tools, in particular to a frame which can be used for a two-wheeled vehicle or a three-wheeled vehicle. Background Art

[0002] At present, the frames of two-wheeled vehicles and three-wheeled vehicles are different and cannot be compatible with each other. For enterprises that manufacture two-wheeled vehicles and three-wheeled vehicles, when mass-producing two-wheeled vehicles and three-wheeled vehicles, they need to manufacture two different frames to meet the production and processing of two-wheeled vehicles and three-wheeled vehicles, which greatly increases the production and manufacturing costs of the frames. In addition, in the early frame assembly and production process, the more types of frames there are, the greater the production and processing burden of the lower-level suppliers when preparing materials, and the more complicated the production process, which directly affects the production and processing cycle of two-wheeled or three-wheeled vehicles.

[0003] For this reason, a frame that can be used for two-wheeled vehicles and three-wheeled vehicles has appeared on the market. For example, the Chinese utility model patent with application number 202320788854.5 discloses a rear-drive electric three-wheeled bicycle, in which a battery is stored in the frame, the front fork at the front end of the frame is connected to the front wheel, the frame is equipped with a toothed disc through a crank, and the rear end of the frame is detachably equipped with a rear wheel assembly, the rear wheel assembly includes a transmission rod, the two ends of the transmission rod are respectively connected to the rear wheel, the transmission rod is equipped with a rear transmission, and the rear transmission is connected to the toothed disc on the frame through a first chain; the transmission rod is also covered with a connecting plate, one end of the connecting plate is installed on the rear fork at the rear end of the frame, and the other end of the connecting plate is equipped with a motor, the motor is electrically connected to the battery, a driving gear is provided on the motor shaft, and a flywheel is provided on the transmission rod, and the driving gear is connected to the flywheel through a second chain. The rear-drive electric three-wheeled bicycle sets the motor in the rear wheel assembly to realize rear drive, and can directly use the two-wheel electric vehicle frame and the rear wheel assembly for assembly, so as to realize the conversion of a two-wheeled vehicle into a three-wheeled vehicle, which is simple and convenient. The transmission rod is also sleeved with two sleeves, and a bearing is provided between the sleeve and the transmission rod. The two sleeves are located at the two ends of the transmission rod, and two connecting plates are respectively installed on the two sleeves; a tensioning bracket is also installed on one of the sleeves, and a tensioning wheel group is provided on the tensioning bracket to cooperate with the first chain, and the tensioning wheel group includes an upper gear and a lower gear, and the first chain passes between the upper gear and the lower gear, so that it is convenient to adjust the tension of the first chain between the rear transmission and the toothed plate. The problem of the rear-drive electric tricycle is that only the tensioning wheel group can be used to adjust the tightness of the first chain between the rear transmission and the toothed plate on the frame, and the tightness of the second chain between the driving gear and the flywheel cannot be adjusted. When the second chain is too loose, only part of the chain links of the second chain can be removed to adjust the tension, and the operation steps are complicated and the efficiency is low; in addition, the tensioning wheel group has a complex structure, and once a fault occurs, it is difficult to repair, time-consuming, and the labor cost is high. Therefore, the utility model proposes a frame that can be used for two-wheeled vehicles or three-wheeled vehicles, in order to solve the above technical problems. Summary of the Invention

[0004] The purpose of the present utility model is to overcome the defects existing in the prior art and provide a frame that can be used for two-wheelers or three-wheelers. It can be used to assemble two-wheelers or three-wheelers. For frame production enterprises, it can reduce the types of frames and the required die tooling, making the production operation simpler. It can avoid unnecessary waste caused by misoperations during the production of complex and diverse vehicle models. When assembling a two-wheeler, the rear wheel can be directly installed on the two hook claws. When assembling a three-wheeler, the three-wheeler bracket is installed at the right end of the frame body, and the subsequent operations are the same as those of a common three-wheeler installation process, which is simple and convenient. For the assembled two-wheeler, the tension of the chain connected between the sprocket on the rear wheel axle and the chainring at the left end of the frame body can be adjusted by adjusting the zipper devices located on the front and rear sides. For the assembled three-wheeler, the tension of the first chain connected between the sprocket on the motor shaft and the chainring at the left end of the frame body can be adjusted by adjusting the zipper devices located on the front and rear sides. By adjusting the fixed positions of the mounting holes on the hook claws and the horizontal waist-shaped holes on the three-wheeler bracket, the tension of the second chain connected between the driving gear installed on the motor shaft and the driven sprocket installed on the rear wheel transmission rod can be adjusted. The steps for adjusting the chain tension on the two-wheeler and three-wheeler are simple, the design of the chain tension adjustment mechanism is simple, the preparation and implementation are highly feasible, and the practicability is strong.

[0005] To achieve the above purpose, the technical solution of the present utility model is to design a frame that can be used for two-wheelers or three-wheelers, including a frame body. A sleeve one for installing a handlebar assembly is provided at the left end of the frame body. A support tube extending upward to the right and a lower fork extending horizontally to the right are provided at the right end of the frame body. An upper fork is also included. The left end of the upper fork is fixedly connected to the upper end of the support tube. Both the lower fork and the upper fork are Y-shaped structures with openings facing the right. The right ends of the lower fork arms located in the front of the lower fork and the right ends of the upper fork arms located in the front of the upper fork are both fixedly provided on a hook claw located in the front. The right ends of the lower fork arms located in the rear of the lower fork and the right ends of the upper fork arms located in the rear of the upper fork are both fixedly provided on another hook claw located in the rear. U-shaped grooves one with openings facing the right are respectively provided on the two hook claws. A zipper device for adjusting the fixed position of the end of the rear wheel axle or the motor shaft fixedly inserted therein is installed inside the U-shaped groove one. A plurality of mounting holes are also provided at intervals on the hook claws on the outer peripheral side of the U-shaped groove one.

[0006] It further includes a tricycle bracket. Corresponding to the left end of the tricycle bracket, there are connecting vertical plates located on the front and rear sides. On the connecting vertical plates, there are U-shaped grooves II with openings facing left and several horizontal waist-shaped holes spaced on the outer periphery of the U-shaped grooves II. When the frame body and the tricycle bracket are assembled into a tricycle, the connecting vertical plates on the front and rear sides are correspondingly and fittingly inserted into the gaps between the two claw hooks, or the two claw hooks are correspondingly and fittingly inserted into the gaps between the connecting vertical plates on the front and rear sides. And the corresponding connecting vertical plates and claw hooks are fixedly connected together by bolt assemblies passing through the corresponding mounting holes and horizontal waist-shaped holes. The end of the motor shaft also passes through the corresponding U-shaped groove II.

[0007] A frame of the present utility model that can be used for a two-wheeler or a tricycle can be used to assemble a two-wheeler or a tricycle. For a frame production enterprise, it can reduce the types of frames and the required die tooling, and the production operation is simpler. It can avoid unnecessary waste caused by misoperations during the production of complex and diverse vehicle models. When assembling a two-wheeler, the rear wheel can be directly installed on the two claw hooks. When assembling a tricycle, the tricycle bracket is installed at the right end of the frame body, and the subsequent operations are the same as those of a common tricycle, with simple and convenient operations. The assembled two-wheeler can adjust the tightness of the chain connected between the sprocket on the rear wheel axle and the sprocket on the left end of the frame body by adjusting the zipper devices on the front and rear sides. The assembled tricycle can adjust the tightness of the first chain connected between the sprocket on the motor shaft and the sprocket on the left end of the frame body by adjusting the zipper devices on the front and rear sides. By adjusting the fixed positions of the mounting holes on the claw hooks and the horizontal waist-shaped holes on the tricycle bracket, the tightness of the second chain connected between the driving gear installed on the motor shaft and the driven sprocket installed on the rear wheel transmission rod can be adjusted. The steps for adjusting the chain tightness on the two-wheeler and the tricycle are simple, the design of the chain tightness adjustment mechanism is simple, and the preparation and implementation are highly feasible, with strong practicability.

[0008] The preferred technical solution is that the frame body includes a frame one and a frame two. The right end of the frame one is connected to the left end of the frame two through a folding device, and when the frame body is in a folded state, the frame one is arranged side by side in front of or behind the frame two. The sleeve one is located at the left end of the frame one. The support tube, the lower fork, and the upper fork are located at the right end of the frame two. A cavity for installing a crank assembly and a sprocket is provided at the left end of the frame two. The frame body can be folded, which can greatly reduce the overall volume whether assembling a two-wheeler or a tricycle. For a manufacturer, it can effectively save production and packaging space and reduce packaging costs. For a customer, it can effectively reduce storage space and is convenient to carry.

[0009] Further preferably, there are also the following technical solutions. Both the mounting holes and the horizontal kidney-shaped holes each include four. Two mounting holes are spaced above the corresponding U-shaped groove 1, and the other two mounting holes are spaced below the corresponding U-shaped groove 1. Two horizontal kidney-shaped holes are spaced above the corresponding U-shaped groove 2, and the other two horizontal kidney-shaped holes are spaced below the corresponding U-shaped groove 2. The mounting holes on the claw and the horizontal kidney-shaped holes on the connecting vertical plate are both correspondingly provided with four, and are pairwise correspondingly located on the upper and lower sides of the U-shaped groove, which helps to improve the mounting stability between the left end of the tricycle bracket and the right end of the vehicle frame body, and avoid the shaking phenomenon caused by unstable connection during the later use of the tricycle.

[0010] Further preferably, there are also the following technical solutions. On the front and rear sides of the middle part of the tricycle bracket, there is respectively one sleeve 2 for installing the rear wheel. Below the two sleeves 2, there is a U-shaped connecting rod for fixedly connecting the two. When assembling into a tricycle, a transmission rod is inserted and installed inside the two sleeves 2, and the rear wheels are installed at both ends of the transmission rod, which improves the convenience of installing the rear wheels. The U-shaped connecting rod helps to improve the rigidity between the two sleeves 2, that is, improves the mounting stability of the two rear wheels.

[0011] Further preferably, there are also the following technical solutions. A battery is installed on the vehicle frame 1. The battery installation position is reasonable, which helps to improve the compactness of the vehicle frame.

[0012] Further preferably, there are also the following technical solutions. The zipper device includes an annular plate, a screw rod, a clamping block and an adjusting nut. One end of the screw rod is fixedly arranged on the outer peripheral side of the annular plate. The clamping block has a through groove that penetrates the upper and lower end faces and opens to one side, and the clamping block also has a through hole that penetrates the bottom of the through groove. The clamping block is sleeved on the screw rod through the through hole. The adjusting nut is screwed on the end of the screw rod. One end face of the annular plate has a reinforcing block passing through the same diameter. The annular plate has a central hole. In the middle of the inner wall surface of the U-shaped groove 1, there is a U-shaped clamping plate with an opening facing to the right, and the thickness of the U-shaped clamping plate < the thickness of the inner wall surface of the U-shaped groove 1. The annular plate is clamped inside the opening groove of the U-shaped clamping plate through the reinforcing block, and the annular plate is attached to the inner side or the outer side of the U-shaped clamping plate. The clamping block is clamped and fixed to the right end of the U-shaped clamping plate through the through groove. A threaded section is provided at the end of the rear wheel axle or the motor shaft. The threaded section at the end of the rear wheel axle or the threaded section at the end of the motor shaft both penetrate the central hole on the corresponding zipper device and are fixedly locked and connected to the corresponding claw through a locking nut screwed on the threaded section. The zipper device has a simple structural design, good mounting stability inside the U-shaped groove 1 on the claw, and good plugging adaptability with the end of the rear wheel axle or the motor shaft, thus ensuring the convenience and high efficiency when the present utility model is assembled into a two-wheeler or a tricycle.

[0013] The advantages and beneficial effects of the present utility model are as follows:

[0014] 1. A frame for a two-wheeler or a three-wheeler of the present utility model can be used to assemble a two-wheeler or a three-wheeler. For a frame manufacturing enterprise, it can reduce the types of frames and the required tooling, making the production operation simpler, and avoiding unnecessary waste caused by misoperations during the production of complex and diverse vehicle models. When assembling a two-wheeler, the rear wheel can be directly installed on the two hooks. When assembling a three-wheeler, the three-wheeler bracket is installed at the right end of the frame body, and the subsequent operations are the same as those of a common three-wheeler installation process, with simple and convenient operations. For the assembled two-wheeler, the tightness of the chain connected between the sprocket on the rear wheel axle and the chainring at the left end of the frame body can be adjusted by adjusting the zipper devices located on the front and rear sides. For the assembled three-wheeler, the tightness of the first chain connected between the sprocket on the motor shaft and the chainring at the left end of the frame body can be adjusted by adjusting the zipper devices located on the front and rear sides. By adjusting the fixed positions of the mounting holes on the hooks and the horizontal waist-shaped holes on the three-wheeler bracket, the tightness of the second chain connected between the driving gear installed on the motor shaft and the driven sprocket installed on the rear wheel transmission rod can be adjusted. The steps for adjusting the chain tightness on both the two-wheeler and the three-wheeler are simple, the design of the chain tightness adjustment mechanism is simple, the preparation and implementation are highly feasible, and the practicability is strong.

[0015] 2. The frame body can be folded. Whether assembling a two-wheeler or a three-wheeler, the overall volume can be greatly reduced. For manufacturers, it can effectively save production and packaging space and reduce packaging costs. For customers, it can effectively reduce storage space and is convenient to carry.

[0016] 3. The mounting holes on the hooks and the horizontal waist-shaped holes on the connecting vertical plates are all correspondingly provided with four, and are pairwise correspondingly located on the upper and lower sides of the U-shaped groove, which helps to improve the installation stability between the left end of the three-wheeler bracket and the right end of the frame body, and avoid the shaking phenomenon caused by unstable connections during the later use of the three-wheeler.

[0017] 4. The zipper device has a simple structure design, good installation stability inside the U-shaped groove on the hook, and good insertion adaptability with the end of the rear wheel axle or the motor shaft, thus ensuring the convenience and high efficiency when the present utility model is assembled into a two-wheeler or a three-wheeler. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a front view structural schematic diagram of a frame for a two-wheeler or a three-wheeler in Embodiment 1;

[0019] Figure 2 is Figure 1 a partial enlarged view of the H position in

[0020] Figure 3 is a three-dimensional structure diagram of the zipper device;

[0021] Figure 4Schematic front view structure diagram of a two-wheeler frame in Embodiment 2;

[0022] Figure 5 is Figure 4 Partial enlarged view at S in;

[0023] Figure 6 Schematic front view structure diagram of an electric tricycle frame in Embodiment 3;

[0024] Figure 7 is Figure 6 Partial enlarged view at T in;

[0025] Figure 8 Schematic bottom view structure diagram of an electric tricycle frame in Embodiment 3;

[0026] Figure 9 is Figure 8 Partial enlarged view at W in.

[0027] In the figure: 1. Frame one; 2. Frame two; 3. Hook; 4. Zipper; 5. Folding device; 6. Battery; 7. Rear wheel; 8. Tricycle bracket; 9. Bolt assembly; 10. Motor shaft; 11. Motor; 1-1. Sleeve one; 2-1. Cavity; 2-2. Support tube; 2-3. Lower fork; 2-3a. Lower fork arm; 2-4. Upper fork; 2-4a. Upper fork arm; 3-1. U-shaped groove one; 3-2. U-shaped clamping plate; 3-3. Mounting hole; 4-1. Ring plate; 4-1a. Central hole; 4-1b. Reinforcing block; 4-2. Screw; 4-3. Clamping block; 4-3a. Card slot; 4-4. Adjusting nut; 7-1. Rear wheel axle; 8-1. Connecting vertical plate; 8-1a. U-shaped groove two; 8-1b. Horizontal waist-shaped hole; 8-2. Sleeve two; 8-3. U-shaped connecting rod; 11-1. Driving gear; 11-2. Sprocket two; A. Locking nut. Detailed implementation manners

[0028] The following combines the drawings and embodiments to further describe the detailed implementation manners of the present invention. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and cannot be used to limit the protection scope of the present invention.

[0029] Embodiment 1

[0030] As Figures 1 to 3As shown in the figure, the utility model relates to a frame that can be used for a two-wheeler or a three-wheeler, including a frame body. A sleeve 1-1 for installing a handlebar assembly is provided at the left end of the frame body. A support tube 2-2 extending upward to the right and a lower fork 2-3 extending horizontally to the right are provided at the right end of the frame body. An upper fork 2-4 is further included. The left end of the upper fork 2-4 is fixedly connected to the upper end of the support tube 2-2. Both the lower fork 2-3 and the upper fork 2-4 are Y-shaped structures with openings facing the right. The right end of the lower fork arm 2-3a located on the front side of the lower fork 2-3 and the right end of the upper fork arm 2-4a located on the front side of the upper fork 2-4 are both fixedly provided on a hook 3 located on the front side. The right end of the lower fork arm 2-3a located on the rear side of the lower fork 2-3 and the right end of the upper fork arm 2-4a located on the rear side of the upper fork 2-4 are both fixedly provided on another hook 3 located on the rear side. U-shaped grooves 3-1 with openings facing the right are respectively provided on the two hooks 3. A zipper 4 for adjusting and fixedly connecting the end of the rear wheel axle 7-1 or the end of the motor shaft 10 fixedly installed inside is installed inside the U-shaped groove 3-1. A plurality of mounting holes 3-3 are also provided on the hook 3 at intervals on the outer peripheral side of the U-shaped groove 3-1;

[0031] A three-wheeler bracket 8 is further included. Corresponding connecting vertical plates 8-1 located on the front and rear sides are provided at the left end of the three-wheeler bracket 8. A U-shaped groove 8-1a with an opening facing the left and a plurality of horizontal waist-shaped holes 8-1b spaced at intervals on the outer peripheral side of the U-shaped groove 8-1a are provided on the connecting vertical plate 8-1. When the frame body and the three-wheeler bracket 8 are assembled into a three-wheeler, the connecting vertical plates 8-1 located on the front and rear sides are correspondingly inserted and fitted into the gap between the two hooks 3, or the two hooks 3 are correspondingly inserted and fitted into the gap between the connecting vertical plates 8-1 located on the front and rear sides, and the corresponding connecting vertical plate 8-1 and the hook 3 are fixedly connected together by a bolt assembly 9 passing through the corresponding mounting hole 3-3 and the horizontal waist-shaped hole 8-1b. The end of the motor shaft 10 also passes through the corresponding U-shaped groove 8-1a.

[0032] Preferably, the frame body includes a frame one 1 and a frame two 2. The right end of the frame one 1 is connected to the left end of the frame two 2 through a folding device 5. When the frame body is in a folded state, the frame one 1 is arranged side by side in front of or behind the frame two 2. The sleeve 1-1 is located at the left end of the frame one 1. The support tube 2-2, the lower fork 2-3, and the upper fork 2-4 are located at the right end of the frame two 2. A cavity 2-1 for installing a crank assembly and a chainring is provided at the left end of the frame two 2.

[0033] Further preferably, both the mounting holes 3-3 and the horizontal waist-shaped holes 8-1b include four. Two mounting holes 3-3 are spaced on the upper side of the corresponding U-shaped groove 1-3, and the other two mounting holes 3-3 are spaced on the lower side of the corresponding U-shaped groove 1-3. Two horizontal waist-shaped holes 8-1b are spaced on the upper side of the corresponding U-shaped groove 2-8a, and the other two horizontal waist-shaped holes 8-1b are spaced on the lower side of the corresponding U-shaped groove 2-8a.

[0034] Further preferably, on the front and rear sides of the middle part of the tricycle bracket 8, a second sleeve 8-2 for mounting the rear wheel 7 is respectively provided, and a U-shaped connecting rod 8-3 for fixedly connecting the two second sleeves 8-2 is provided on the lower side of the two second sleeves 8-2.

[0035] Further preferably, a battery 6 is mounted on the first frame 1.

[0036] Further preferably, the zipper 4 includes an annular plate 4-1, a screw 4-2, a clamping block 4-3 and an adjusting nut 4-4. One end of the screw 4-2 is fixedly arranged on the outer peripheral side surface of the annular plate 4-1. The clamping block 4-3 has a clamping groove 4-3a that penetrates the upper and lower end faces and opens to one side. The clamping block 4-3 also has a through hole that penetrates the bottom of the clamping groove 4-3a. The clamping block 4-3 is sleeved on the screw 4-2 through the through hole. The adjusting nut 4-4 is screwed on the end of the screw 4-2. One end surface of the annular plate 4-1 has a reinforcing block 4-1b passing through the same diameter. The annular plate 4-1 has a central hole 4-1a. In the middle of the inner wall surface of the U-shaped groove 1-3, a U-shaped clamping plate 3-2 with an opening facing the right is fixedly arranged, and the thickness of the U-shaped clamping plate 3-2 < the thickness of the inner wall surface of the U-shaped groove 1-3. The annular plate 4-1 is clamped inside the opening groove of the U-shaped clamping plate 3-2 through the reinforcing block 4-1b, and the annular plate 4-1 is attached to the inner side surface or the outer side surface of the U-shaped clamping plate 3-2. The clamping block 4-3 is clamped and fixed to the right end of the U-shaped clamping plate 3-2 through the clamping groove 4-3a. A threaded section is provided at the end of the rear wheel axle 7-1 or the end of the motor shaft 10. The threaded section at the end of the rear wheel axle 7-1 or the threaded section at the end of the motor shaft 10 passes through the central hole 4-1a on the corresponding zipper 4 and is fixedly locked and connected to the corresponding claw 3 through a locking nut A screwed on the threaded section.

[0037] Embodiment 2

[0038] As Figures 4 to 5As shown in the figure, the utility model is a two-wheeler frame. The rear wheel 7 is located within the gap between two hook claws 3. Both ends of the rear wheel axle 7-1 respectively pass through the central holes 4-1a on the inner ring plates 4-1 of the U-shaped grooves 3-1 on the corresponding hook claws 3 and extend to the side of the hook claws 3 away from the rear wheel 7. A chain is connected between the chainring mounted on the cavity 2-1 and the first sprocket on the rear wheel axle 7-1. The chain tension is adjusted in place by moving the screws 4-2 on the front and rear chain adjusters 4. Then, the end of the rear wheel axle 7-1 is fixedly and tightly connected to the corresponding hook claw 3 by a locking nut A screwed onto the threaded section, and the adjusting nut 4-4 is rotated to abut against the clamping block 4-3 (the first chain, chainring, and locking nut A are not shown in the figure). The rear wheel 7 can preferably be a wheel with a hub motor, and the assembled two-wheeler is an electric vehicle.

[0039] When adjusting the tightness of the chain, loosen the locking nut A at both ends of the rear wheel axle 7-1 and the adjusting nut 4-4 on the front and rear chain adjusters 4. Adjust the chain tension in place by moving the screws 4-2 on the front and rear chain adjusters 4. Then, fixedly and tightly connect both ends of the rear wheel axle 7-1 to the corresponding hook claw 3 by a locking nut A screwed onto the threaded section, and rotate the adjusting nut 4-4 to abut against the clamping block 4-3.

[0040] Embodiment 3

[0041] As Figures 6 to 9 As shown in the figure, the utility model is a three-wheeler electric vehicle frame. Both ends of the motor shaft 10 respectively pass through the central holes 4-1a on the inner ring plates 4-1 of the U-shaped grooves 3-1 on the corresponding hook claws 3 and the U-shaped grooves 8-1a on the connecting vertical plates 8-1 and extend to the outside of the three-wheeler bracket 8. The threaded sections at both ends of the motor shaft 10 are fixedly and tightly connected to the corresponding hook claws 3 by screwed locking nuts A. A driving gear 11-1, a motor 11, and a second sprocket 11-2 are sequentially installed on the motor shaft 10, wherein the driving gear 11-1 is installed at one end of the output shaft of the motor 11. A transmission rod is inserted through the two sleeves 8-2 of the three-wheeler bracket 8. Both ends of the transmission rod are respectively rotatably installed with rear wheels 7 on the front and rear sides of the three-wheeler bracket 8. Nuts are respectively screwed onto the threaded sections at both ends of the transmission rod. The transmission rod is provided with a driven sprocket. A second chain is connected between the driven sprocket and the driving gear 11-1. A first chain is connected between the chainring mounted on the cavity 2-1 and the second sprocket 11-2 (the first chain, second chain, chainring, transmission rod, driven sprocket, and rear wheel are not shown in the figure).

[0042] When adjusting the tightness of the first chain, loosen the lock nuts A at both ends of the motor shaft 10 and the adjusting nuts 4-4 on the front and rear zipper devices 4. Adjust the tension of the first chain to the appropriate position by moving the screws 4-2 on the front and rear zipper devices 4. Then, fix and lock the two ends of the motor shaft 10 together with the corresponding hook claws 3 by screwing the lock nuts A onto the threaded sections, and rotate the adjusting nuts 4-4 to press against the clamping blocks 4-3.

[0043] When adjusting the tightness of the second chain, loosen the nuts on the bolt assemblies 9 on the front and rear sides. Then, move the tricycle bracket 8 in the left-right direction to adjust the tension of the second chain to the appropriate position. Then, tighten the nuts on the bolt assemblies 9 on the front and rear sides again to fixedly connect the connecting vertical plates 8-1 on the front and rear sides with the corresponding hook claws 3.

[0044] A frame of the present utility model that can be used for two-wheelers or tricycles can be used to assemble two-wheelers or tricycles. For frame production enterprises, it can reduce the types of frames and the required mold tooling, making the production operation simpler and avoiding unnecessary waste caused by misoperations during the production of complex and diverse vehicle models. When assembling a two-wheeler, directly install the rear wheel on the two hook claws. When assembling a tricycle, install the tricycle bracket at the right end of the frame body, and the subsequent operations are the same as those of a normal tricycle, with simple and convenient operations. For the assembled two-wheeler, the tightness of the chain connecting the sprocket on the rear wheel axle and the chainring on the left end of the frame body can be adjusted by adjusting the zipper devices on the front and rear sides. For the assembled tricycle, the tightness of the first chain connecting the sprocket on the motor shaft and the chainring on the left end of the frame body can be adjusted by adjusting the zipper devices on the front and rear sides. By adjusting the fixed positions of the mounting holes on the hook claws and the horizontal waist-shaped holes on the tricycle bracket, the tightness of the second chain connecting the driving gear mounted on the motor shaft and the driven sprocket mounted on the rear wheel transmission rod can be adjusted. The steps for adjusting the chain tightness on both the two-wheeler and the tricycle are simple, and the design of the chain tightness adjustment mechanism is simple, with high feasibility in preparation and implementation and strong practicability.

[0045] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model.

Claims

1. A frame for a two-wheeled vehicle or a three-wheeled vehicle, comprising a frame body, wherein the left end of the frame body is provided with a sleeve (1-1) for mounting a handlebar assembly, the right end of the frame body is provided with a support tube (2-2) extending upward to the right side and a lower fork (2-3) extending horizontally to the right side, and further comprising an upper fork (2-4), wherein the left end of the upper fork (2-4) is fixedly connected to the upper end of the support tube (2-2), and the lower fork (2-3) and the upper fork ( 2-4) are both Y-shaped structures with their openings facing rightwards, the right end of the lower fork arm (2-3a) located at the front side of the lower fork (2-3) and the right end of the upper fork arm (2-4a) located at the front side of the upper fork (2-4) are both fixedly arranged on a hook (3) located at the front side, and the right end of the lower fork arm (2-3a) located at the rear side of the lower fork (2-3) and the right end of the upper fork arm (2-4a) located at the rear side of the upper fork (2-4) are both fixedly arranged on another hook (3) located at the rear side, characterized in that: The two hooks (3) are respectively provided with a U-shaped groove (3-1) with an opening facing the right side, and a zipper (4) for adjusting the fixed position of the end of the rear wheel axle (7-1) or the end of the motor shaft (10) fixed therein is installed inside the U-shaped groove (3-1), and a plurality of mounting holes (3-3) located on the outer peripheral side of the U-shaped groove (3-1) are also provided on the hook (3); It also includes a tricycle bracket (8), wherein the left end of the tricycle bracket (8) is provided with a connecting vertical plate (8-1) located on the front and rear sides, and the connecting vertical plate (8-1) is provided with a U-shaped groove (8-1a) opening toward the left side and a plurality of horizontal waist-shaped holes (8-1b) spaced apart and located on the outer peripheral side of the U-shaped groove (8-1a). When the frame body and the tricycle bracket (8) are assembled into a tricycle, the connecting vertical plates (8-1) located on the front and rear sides are correspondingly fitted and inserted into the gap between the two hook claws (3), or the two hook claws (3) are correspondingly fitted and inserted into the gap between the connecting vertical plates (8-1) located on the front and rear sides, and the corresponding connecting vertical plates (8-1) and hook claws (3) are fixedly connected together by bolt assemblies (9) penetrating the corresponding mounting holes (3-3) and the horizontal waist-shaped holes (8-1b), and the end of the motor shaft (10) is also inserted into the corresponding U-shaped groove (8-1a).

2. The frame for a two-wheeled vehicle or a three-wheeled vehicle according to claim 1, characterized in that: The frame body comprises a frame one (1) and a frame two (2), the right end of the frame one (1) is connected to the left end of the frame two (2) through a folding device (5), and when the frame body is in a folded state, the frame one (1) is arranged in parallel with the front side or the rear side of the frame two (2), the sleeve one (1-1) is located at the left end of the frame one (1), the support tube (2-2), the lower fork (2-3) and the upper fork (2-4) are located at the right end of the frame two (2), and the left end of the frame two (2) is provided with a cavity (2-1) for installing a crank assembly and a toothed disc.

3. The frame for a two-wheeled vehicle or a three-wheeled vehicle according to claim 2, characterized in that: The mounting holes (3-3) and the horizontal waist-shaped holes (8-1b) each include four, two mounting holes (3-3) are spaced apart and located on the upper side of the corresponding U-shaped groove one (3-1), and the other two mounting holes (3-3) are spaced apart and located on the lower side of the corresponding U-shaped groove one (3-1), two horizontal waist-shaped holes (8-1b) are spaced apart and located on the upper side of the corresponding U-shaped groove two (8-1a), and the other two horizontal waist-shaped holes (8-1b) are spaced apart and located on the lower side of the corresponding U-shaped groove two (8-1a).

4. The frame for a two-wheeled vehicle or a three-wheeled vehicle according to claim 3, characterized in that: A second sleeve (8-2) for mounting the rear wheel (7) is respectively provided on the front and rear sides of the middle of the tricycle bracket (8), and a U-shaped connecting rod (8-3) for fixing the two sleeves (8-2) together is provided on the lower sides of the two sleeves (8-2).

5. The frame for a two-wheeled vehicle or a three-wheeled vehicle according to claim 4, characterized in that: A battery (6) is installed on the frame 1 (1).

6. A frame for a two-wheeled vehicle or a three-wheeled vehicle as claimed in any one of claims 1 to 5, characterized in that: The zipper (4) comprises a ring plate (4-1), a screw rod (4-2), a clamping block (4-3) and an adjusting nut (4-4); one end of the screw rod (4-2) is fixedly arranged on the outer peripheral side surface of the ring plate (4-1); the clamping block (4-3) has a clamping groove (4-3a) penetrating the upper and lower end surfaces and opening toward one side; the clamping block (4-3) also has a through hole penetrating the bottom of the clamping groove (4-3a); the clamping block (4-3) is sleeved on the screw rod (4-2) through the through hole; the adjusting nut (4-4) is screwed to the end of the screw rod (4-2); one end surface of the ring plate (4-1) has a reinforcing block (4-1b) having the same diameter; the ring plate (4-1) has a center hole (4-1a); the middle part of the inner wall surface of the U-shaped groove (3-1) is fixedly provided with an opening facing toward The U-shaped clamping plate (3-2) is arranged on the right side, and the thickness of the U-shaped clamping plate (3-2) is less than the thickness of the inner wall of the U-shaped groove (3-1). The ring plate (4-1) is clamped by the reinforcing block (4-1b) and is located inside the opening groove of the U-shaped clamping plate (3-2). The ring plate (4-1) is located on the inner side or outer side of the U-shaped clamping plate (3-2). The clamping block (4-3) is clamped and fixed to the right end of the U-shaped clamping plate (3-2) by the clamping groove (4-3a). The end of the rear wheel axle (7-1) or the end of the motor shaft (10) is provided with a threaded section. The threaded section at the end of the rear wheel axle (7-1) or the end of the motor shaft (10) passes through the center hole (4-1a) on the corresponding zipper (4) and is fixedly locked with the corresponding hook (3) by a locking nut (A) screwed on the threaded section.

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