Frame and scooter

Abstract

The invention relates to the technical field of scooters, and discloses a scooter frame and a scooter. The scooter frame comprises a front frame body, a middle frame body and a rear frame body; the front frame body comprises a main pipe and a front transverse pipe, the front transverse pipe comprises a transverse pipe main body which is transversely arranged, and the two ends of the transverse pipe main body extend backwards to form first lap joint sections respectively; the middle frame body comprises a left middle side pipe and a right middle side pipe. The left middle side pipe and the right middle side pipe each comprise a second lap joint section, a transition connection section and a rear extending pipe section which are connected in sequence. The rear frame body comprises a left rear side pipe and a right rear side pipe, and the left rear side pipe and the right rear side pipe are each provided with a third lap joint section. Two triangular supporting units are formed among the main pipe, the transverse pipe body, the left middle side pipe and the right middle side pipe, a truss type structure is formed, the tendencies of the torsional rigidity and the longitudinal rigidity of the front portion of a frame are more ideal, and the handling stability of a vehicle is improved. On the basis that the structures of the front frame body, the middle frame body and the rear frame body are kept unchanged, the position of the rear frame body can be adjusted so as to adapt to vehicle types with different wheelbases, and modularization and generalization of the frame structure are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of scooters, in particular to a frame and a scooter. Background Art

[0002] The current scooter frame can only adopt a non-truss structure due to the space limitation of the middle pedal. The frame uses a single main pipe extending to the cradle mounting frame, such as Figure 1 As shown, an existing scooter frame is shown, wherein the main pipe 1' extends backward and crosses the space of the middle pedal to the position of the cradle mounting frame 2'. On the one hand, the frame structure is difficult to modularize and generalize, and corresponding frame parts need to be designed and manufactured correspondingly between vehicle models with different wheelbases, resulting in poor compatibility; on the other hand, the rigidity of the frame structure needs to be improved. If greater rigidity is required, more parts need to be added to the frame to enhance the stability of the connection position, such as Figure 1 The rib plate 3' configured in the middle increases the number of parts, resulting in heavy weight, increased complexity of the frame structure and high cost, making it difficult to achieve both lightweight. Summary of the invention

[0003] In view of this, the present invention proposes a frame and a scooter, the purpose of which is to make the structure of the frame lightweight, modular and universal, while ensuring that the frame has sufficient rigidity margin.

[0004] In a first aspect, the solution provided by the present invention includes:

[0005] A vehicle frame, comprising:

[0006] A front frame, a middle frame and a rear frame;

[0007] The front frame body includes a main pipe and a front cross pipe, the front cross pipe includes a cross pipe body arranged transversely, and both ends of the cross pipe body respectively extend rearward to form a first overlapping section; the main pipe is arranged to extend vertically and the bottom end of the main pipe is fixed to the middle of the cross pipe body;

[0008] The intermediate frame includes left and right intermediate side pipes, and the left and right intermediate side pipes each include a second overlapping section, a transition connecting section, and a rearward extension pipe section that are sequentially connected, the length direction of the second overlapping section is the same as the length direction of the main pipe, and the second overlapping section is overlapped on the main pipe; the length direction of the rearward extension pipe section is the same as the length direction of the first overlapping section, and the first overlapping section is overlapped on the rearward extension pipe section;

[0009] The rear frame includes left and right rear side tubes, and the left and right rear side tubes are provided with a third overlapping section at one end close to the middle frame. The length direction of the third overlapping section is the same as the length direction of the rear extension tube section, and the third overlapping section is overlapped on the rear extension tube section.

[0010] As a further optional solution, the main pipe includes a first pipe section and a second pipe section connected in sequence, and the angle between the first pipe section and the horizontal plane is greater than the angle between the second pipe section and the horizontal plane;

[0011] The second overlapping section is overlapped on the outer side of the first pipe section close to one end of the second pipe section.

[0012] As a further optional solution, the second pipe section is perpendicular to the transverse pipe body, and the transverse pipe body is perpendicular to the first overlapping section.

[0013] As a further optional solution, the intermediate frame also includes a rear cross tube and a cradle mounting frame;

[0014] The rear cross tube is transversely arranged between the left and right middle side tubes, and the two ends of the rear cross tube are respectively welded to the rear extension tube sections on the left and right middle side tubes, and the rear cross tube is located at one end of the rear extension tube section close to the rear frame;

[0015] The cradle mounting frame is arranged at the bottom of one end of the rear extension pipe section close to the rear frame body.

[0016] As a further optional scheme, the intermediate frame also includes two pedal support tubes, and the two pedal support tubes are respectively arranged on the left and right intermediate side tubes, one end of the pedal support tube is welded to one end of the transition connection section close to the second overlapping section, and the other end of the pedal support tube is welded to the rear extension tube section.

[0017] As a further optional solution, the front frame body further comprises a ventilation pipe, an air flow channel penetrating along the axial direction of the ventilation pipe is formed inside the ventilation pipe, and an air outlet opened along the radial direction of the ventilation pipe is provided on the side of the ventilation pipe, and the air outlet is communicated with the air flow channel;

[0018] The main pipe is provided with a mounting hole which penetrates front and back, the ventilation pipe is inserted into the mounting hole, the air outlet on the ventilation pipe is arranged upward, and a vent is formed between the outer side of the ventilation pipe and the inner side wall of the main pipe.

[0019] As a further optional solution, the central axis of the ventilation pipe has an angle of 5-30° with the horizontal plane.

[0020] As a further optional solution, the cross section of the ventilation pipe is non-circular.

[0021] As a further optional solution, the intermediate frame further includes a counterweight block;

[0022] The counterweight block is arranged in one end of the rear extension pipe section close to the rear frame.

[0023] In a second aspect, the solution provided by the present invention includes:

[0024] A scooter comprises any one of the above-mentioned frames.

[0025] Compared with the prior art, the frame and scooter of the present application have at least the following beneficial effects:

[0026] 1. Two triangular support units are formed between the main pipe, the cross pipe body, and the left and right middle side pipes, so that the whole frame forms a truss structure, which makes the torsional rigidity and longitudinal rigidity of the front part of the frame more ideal and improves the handling stability of the vehicle; the frame has a large rigidity margin, which is conducive to reducing the number of parts, achieving lightweight frame structure and reducing costs; the front frame, the middle frame and the rear frame are overlapped and fixed by the first overlap section, the rear extension pipe section and the third overlap section, and the overall stress distribution of the frame is reasonable, there is no stress concentration part, and the welding process requirements are low;

[0027] 2. The rear frame and the middle frame are overlapped with the rear extension pipe section through the third overlap section. The rear frame is adjusted to move forward and backward by setting the overlap position of the second overlap section on the rear extension pipe section to adapt to vehicle models with different wheelbases. Compared with the prior art, when producing vehicle models with different wheelbases, there is no need to design corresponding front frames, middle frames and rear frames, which is conducive to the modularization and universalization of the frame structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of a scooter frame in the prior art;

[0029] Figure 2 It is a structural schematic diagram of a vehicle frame according to an embodiment of the present invention;

[0030] Figure 3 is an exploded schematic diagram of a vehicle frame according to an embodiment of the present invention;

[0031] Figure 4 is a schematic top view of a vehicle frame according to an embodiment of the present invention;

[0032] Figure 5 yes Figure 4 Schematic cross-sectional view of AA in the figure;

[0033] Figure 6 yes Figure 4 A schematic cross-sectional view of the middle BB;

[0034] Figure 7 yes Figure 6 Enlarged view of middle C;

[0035] Figure 8 yes Figure 7 Schematic cross-sectional view of the middle DD;

[0036] Fig. 9 is an exploded schematic diagram of a ventilation pipe and a main pipe in an embodiment of the present invention;

[0037] Fig.10 is Figure 1 A schematic structural diagram of a pedal support tube and a rear cross tube is added on the basis of the embodiment.

[0038] Figure 2-10 Among them, 1, front frame; 11, main pipe; 111, first pipe section; 112, second pipe section; 113, mounting hole; 12, front cross pipe; 121, cross pipe body; 122, first overlapping section; 13, ventilation pipe; 131, air flow channel; 132, air outlet; 14, air vent;

[0039] 2. Intermediate frame; 21a. Left intermediate side pipe; 21b. Right intermediate side pipe; 211. Second overlapping section; 212. Transition connecting section; 213. Rear extension pipe section; 22. Counterweight block; 23. Cradle mounting frame; 24. Rear cross pipe; 25. Pedal support pipe;

[0040] 3. rear frame; 31a. left rear side tube; 31b. right rear side tube; 311. third overlapping section. DETAILED DESCRIPTION

[0041] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0042] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0045] refer to Figure 1-3 An embodiment of the present invention shows a vehicle frame, including a front frame body 1, an intermediate frame body 2 and a rear frame body 3; the front frame body 1 includes a main pipe 11 and a front cross pipe 12, the front cross pipe 12 includes a transversely arranged cross pipe body 121, and both ends of the cross pipe body 121 extend rearwardly to form a first overlap section 122; the main pipe 11 is arranged to extend vertically and the bottom end of the main pipe 11 is fixed to the middle of the cross pipe body 121; the intermediate frame body 2 includes left and right intermediate side pipes 21a and 21b, and the left and right intermediate side pipes 21a and 21b each include a second overlap section 211, a transition connection section 212 and a rear extension pipe section 213 connected in sequence, and the second The length direction of the overlapping section 211 is the same as the length direction of the main pipe 11, and the second overlapping section 211 is overlapped on the main pipe 11; the length direction of the rear extension pipe section 213 is the same as the length direction of the first overlapping section 122, and the first overlapping section 122 is overlapped on the rear extension pipe section 213; the rear frame 3 includes left and right rear side pipes 31a and 31b, and the left and right rear side pipes 31a and 31b are both provided with a third overlapping section 311 at one end close to the intermediate frame 2, and the length direction of the third overlapping section 311 is the same as the length direction of the rear extension pipe section 213, and the third overlapping section 311 is overlapped on the rear extension pipe section 213.

[0046] Among them, Figure 1 and Figure 3 As shown, two triangular support units are formed between the main pipe 11, the cross pipe body 121 and the left and right middle side pipes 21a and 21b, so that the whole body forms a truss structure, which makes the torsional stiffness and longitudinal stiffness of the front part of the frame more ideal and improves the handling stability of the vehicle; the frame has a large stiffness margin, which is conducive to reducing the number of parts, achieving lightweight frame structure and reducing costs.

[0047] like Figure 2 and Figure 4As shown, the first overlapping section 122, the second overlapping section 211 and the third overlapping section 311 are all formed by flattening the pipe fittings, so that a groove body (not marked in the figure) with an arc-shaped cross section is formed on the outside, and the inner wall contour of the groove body matches the outer wall contour of the position to be overlapped. For example, the inner wall contour of the groove body on the first overlapping section 122 matches the outer wall contour of the rear extension pipe section 213. The overlapping of the first overlapping section 122 on the rear extension pipe section 213 means that the first overlapping section 122 is first overlapped on the rear extension pipe section 213. The first overlapping section 122, the second overlapping section 211 and the third overlapping section 311 are all of a certain length, so that the welding stress surface at the overlapping position is large and the connection is stable. The front frame 1, the middle frame 2 and the rear frame 3 are welded and fixed by the first overlapping section 122, the rear extended pipe section 213 and the third overlapping section 311, so that the stress distribution of the whole frame is reasonable, there is no stress concentration part, and the welding process requirements are low. Preferably, as Figure 5 As shown, the vertical projection of the installation position of the first overlapping section 122 on the rear extension pipe section 213 at least partially overlaps with the vertical projection of the installation position of the third overlapping section 311 on the rear extension pipe section 213, so that the force between the front frame 1, the middle frame 2 and the rear frame 3 is more stable.

[0048] like Figure 2 , Figure 3 and Figure 5 As shown, the rear frame 3 and the middle frame 2 are overlapped with the rear extension pipe section 213 through the third overlap section 311. The overlap position of the second overlap section 211 on the rear extension pipe section 213 can be selected according to the vehicle models with different wheelbases, that is, the rear frame 3 can be moved forward and backward to adapt to the vehicle models with different wheelbases. Compared with the prior art, when producing vehicle models with different wheelbases, there is no need to design corresponding front frame 1, middle frame 2 and rear frame 3, which is conducive to the modularization and universalization of the frame structure.

[0049] It should be noted that different wheelbases refer to the distance between the front wheel and the rear wheel of the vehicle. In fact, if the wheelbase changes by a small distance, the appearance of the scooter product produced may be very different, while the structure of the frame inside the scooter is not much different. For example, the diameter and wall thickness of the pipes used can be the same. The frame in this embodiment can maintain the structures of the front frame 1, the middle frame 2 and the rear frame 3 unchanged, and only adjust the installation position of the rear frame 3 in the front and rear directions to achieve the change of wheelbase and be compatible with vehicle models with different wheelbases. In the prior art, when the installation position of the rear frame 3 in the front and rear directions is changed, other structures on the frame need to be adjusted accordingly, so the frame in the prior art cannot be modularized.

[0050] In addition, if Figure 5As shown, the length direction of the rear extension tube section 213 is horizontal or tends to be horizontal, so that when the third overlapping section 311 of the rear frame 3 is adjusted along the length direction of the rear extension tube section 213, the position adjustment of the rear frame 3 in the front-to-back direction is relatively obvious.

[0051] In some embodiments, Figure 1 , Figure 3 and Figure 5 As shown, the main pipe 11 includes a first pipe section 111 and a second pipe section 112 connected in sequence, the angle between the first pipe section 111 and the horizontal plane is greater than the angle between the second pipe section 112 and the horizontal plane; the second overlapping section 211 overlaps the outer side of the first pipe section 111 near one end of the second pipe section 112. The first pipe section 111 and the second pipe section 112 are straight pipe sections, and a triangular support unit is formed between the second pipe section 112, the transition connecting section 212 and the transverse pipe body 121, wherein the second pipe section 112 and the transverse pipe body 121 are both straight pipe sections, so that the triangular support unit structure formed is more stable, and the torsional rigidity and longitudinal rigidity of the front part of the frame are better.

[0052] Furthermore, the second pipe section 112 is perpendicular to the transverse pipe body 121, and the transverse pipe body 121 is perpendicular to the first overlapping section 122. Figure 5 and Figure 8 As shown, the bottom end of the second pipe section 112 is welded to the midpoint of the transverse tube body 121, and two triangular support units are symmetrically formed on both sides of the second pipe section 112. The second pipe section 112 is perpendicular to the transverse tube body 121, which can make the force structure between the second pipe section 112 and the transverse tube body 121 more stable, which is beneficial for the second pipe section 112 to better transfer force to the transverse tube body 121. At the same time, the transverse tube body 121 is perpendicular to the first lap section 122, so that the first lap section 122 and the extended pipe section 213 provide more stable lateral support for both ends of the transverse tube body 121.

[0053] In some embodiments, Fig. 9As shown, the intermediate frame 2 further includes a rear cross tube 24 and a cradle mounting frame 23; the rear cross tube 24 is transversely arranged between the left and right intermediate side tubes 21a and 21b, and the two ends of the rear cross tube 24 are respectively welded to the rear extension tube sections 213 on the left and right intermediate side tubes 21a and 21b, and the rear cross tube 24 is located at one end of the rear extension tube section 213 close to the rear frame 3; the cradle mounting frame 23 is arranged at the bottom of one end of the rear extension tube section 213 close to the rear frame 3. The rear cross tube 24 is arranged to further enhance the structural stability between the left and right intermediate side tubes 21a and 21b; preferably, the connection position of the rear cross tube 24 on the rear extension tube section 213 is located within the vertical projection range of the third overlapping section 311, so as to further enhance the position stability between the two third overlapping sections 311 on the rear frame 3.

[0054] In some embodiments, Fig. 9 As shown, the intermediate frame 2 further includes two pedal support tubes 25, which are respectively arranged on the left and right intermediate side tubes 21a and 21b, one end of the pedal support tube 25 is welded to the transition connection section 212 near one end of the second overlap section 211, and the other end of the pedal support tube 25 is welded to the rear extension tube section 213. In this way, the pedal support tube 25, the front cross tube 12, the left intermediate side tube 21a, the right intermediate side tube 21b, the left rear side tube 31a and the right rear side tube 31b are superimposed to form a space truss structure.

[0055] In some embodiments, reference Figure 1 and Figure 2 , the intermediate frame 2 also includes a counterweight 22; the counterweight 22 is arranged in one end of the rear extension pipe section 213 close to the rear frame 3. According to the different wheelbase frames obtained after adjusting the installation position of the rear frame 3 in the front-rear direction, the natural frequencies of the frames with different wheelbases are different. If the natural frequency of the frame is the same as the vibration frequency of the engine, the engine and the frame resonate to achieve the vibration deterioration of the whole vehicle. In this embodiment, the counterweight 22 is configured to change the natural frequency of the frame with different wheelbases, so that the frame and the engine do not resonate, thereby improving the stability of the whole vehicle. The counterweight 22 is welded in the rear extension pipe section 213, and the weight of the counterweight 22 can be selected according to the installation position of the rear frame on the rear extension pipe section 213, so that the natural frequency of the frame and the vibration frequency of the engine are staggered.

[0056] Conventionally, in existing scooters, the transmission box generally adopts a belt-type continuously variable transmission mechanism, which belongs to the dry speed transmission form. The friction resistance is large during operation and a large amount of heat is generated. In order to ensure the normal operation of the belt, air flow is required to ensure that the temperature in the transmission box is not too high. Therefore, an air inlet and an air outlet are provided on the transmission box housing; the air inlet of the engine transmission box housing is connected to the lower part of the main pipe 11 through a pipe, and a hole is opened in the upper part of the main pipe 11 to let in air (this is the existing technology, so it is not shown in the figure). If the air flow entering the transmission box carries dust and fine sand, it is easy to cause wear and slip of the transmission belt, thereby reducing the service life of the transmission belt.

[0057] Therefore, in some embodiments, reference Figure 1 as well as Figure 5-8 The front frame 1 also includes a ventilation pipe 13, an air flow channel 131 penetrating along its axial direction is formed inside the ventilation pipe 13, and an air outlet 132 opened along its radial direction is provided on the side of the ventilation pipe 13, and the air outlet 132 is communicated with the air flow channel 131; the main pipe 11 is provided with a mounting hole 113 penetrating front and back, the ventilation pipe 13 is inserted in the mounting hole 113, the air outlet 132 on the ventilation pipe 13 is arranged upward, and a vent 14 is formed between the outer side of the ventilation pipe 13 and the inner side wall of the main pipe 11.

[0058] Specifically, Figure 6 and Figure 7 As shown, when the scooter is running, the ventilation pipe 13 on the front frame 1 takes in air from the leeward side, and the air outlet of the ventilation pipe 13 is arranged upward, so that the dust with high density entrained in the air flow is discharged along the air flow channel 131 under the action of gravity, and the clean air with low density enters the main pipe 11 from the air outlet 132 above the ventilation pipe 13, and flows downward from the air vent 14 until it enters the transmission box of the engine; in this way, the amount of dust entering the engine transmission box can be greatly reduced, and the life of the transmission belt can be extended.

[0059] Preferably, if Figure 6 As shown, the central axis of the ventilation pipe 13 has an angle of 5-30° with the horizontal plane. In this embodiment, under this angle configuration, on the one hand, the ventilation pipe 13 can maintain a good slope, which is conducive to the discharge of dense dust along the air flow channel 131 under the action of gravity, and avoids the accumulation of dust in the ventilation pipe 13; on the other hand, the angle is not too large, which prevents the dust from easily passing through the air outlet 132 horizontally and entering the main pipe 11 when the dust enters the ventilation pipe 13 along with the air flow.

[0060] Preferably, if Figure 8 and Fig. 9As shown, the cross section of the ventilation pipe 13 is non-circular, so that the ventilation pipe 13 is easier to install on the main pipe 11, and the air outlet 132 on the ventilation pipe 13 is easy to face upward during installation.

[0061] An embodiment of the present invention further provides a scooter, which comprises any one of the above-mentioned frames.

[0062] In summary, the embodiment of the present invention provides a frame and a scooter, in which two triangular support units are formed between the main pipe 11, the cross pipe body 121, and the left and right middle side pipes 21a and 21b, so that the whole frame forms a truss structure, so that the torsional rigidity and longitudinal rigidity of the front part of the frame are more ideal, and the handling stability of the vehicle is improved; the frame has a large rigidity margin, which is conducive to reducing the number of parts, achieving lightweight frame structure, and reducing costs; the front frame body 1, the middle frame body 2 and the rear frame body 3 are connected by the first overlap section 122, the rear extension pipe section 213 and the third overlap section 31 1 is welded and fixed, the stress distribution of the whole frame is reasonable, there is no stress concentration part, and the welding process requirement is low; and the rear frame 3 and the middle frame 2 are overlapped with the rear extension pipe section 213 through the third overlap section 311, and the rear frame 3 is adjusted to move forward and backward by setting the overlap position of the second overlap section 211 on the rear extension pipe section 213 to adapt to the vehicle models with different wheelbases; compared with the prior art, when producing vehicle models with different wheelbases, there is no need to design the corresponding front frame 1, the middle frame 2 and the rear frame 3, which is conducive to the modularization and universalization of the frame structure.

[0063] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0064] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A frame, characterized in that: include: A front frame, a middle frame and a rear frame; The front frame body includes a main pipe and a front cross pipe, the front cross pipe includes a cross pipe body arranged transversely, and both ends of the cross pipe body respectively extend rearward to form a first overlapping section; the main pipe is arranged to extend vertically and the bottom end of the main pipe is fixed to the middle of the cross pipe body; The intermediate frame includes left and right intermediate side pipes, and the left and right intermediate side pipes each include a second overlapping section, a transition connecting section, and a rearward extension pipe section that are sequentially connected, the length direction of the second overlapping section is the same as the length direction of the main pipe, and the second overlapping section is overlapped on the main pipe; the length direction of the rearward extension pipe section is the same as the length direction of the first overlapping section, and the first overlapping section is overlapped on the rearward extension pipe section; The rear frame includes left and right rear side tubes, and the left and right rear side tubes are provided with a third overlapping section at one end close to the middle frame. The length direction of the third overlapping section is the same as the length direction of the rear extension tube section, and the third overlapping section is overlapped on the rear extension tube section.

2. The frame according to claim 1, characterized in that: The main pipe comprises a first pipe section and a second pipe section connected in sequence, wherein the angle between the first pipe section and the horizontal plane is greater than the angle between the second pipe section and the horizontal plane; The second overlapping section is overlapped on the outer side of the first pipe section close to one end of the second pipe section.

3. The frame according to claim 2, characterized in that: The second pipe section is perpendicular to the transverse pipe body, and the transverse pipe body is perpendicular to the first overlapping section.

4. The frame according to claim 1, characterized in that: The intermediate frame also includes a rear cross tube and a cradle mounting frame; The rear cross tube is transversely arranged between the left and right middle side tubes, and the two ends of the rear cross tube are respectively welded to the rear extension tube sections on the left and right middle side tubes, and the rear cross tube is located at one end of the rear extension tube section close to the rear frame; The cradle mounting frame is arranged at the bottom of one end of the rear extension pipe section close to the rear frame body.

5. The frame according to claim 4, characterized in that: The intermediate frame also includes two pedal support tubes, which are respectively arranged on the left and right intermediate side tubes, one end of the pedal support tube is welded to one end of the transition connection section close to the second overlapping section, and the other end of the pedal support tube is welded to the rear extension tube section.

6. The frame according to claim 1, characterized in that: The front frame body also includes a ventilation pipe, an air flow channel is formed inside the ventilation pipe along its axial direction, and a side of the ventilation pipe is provided with an air outlet opened along its radial direction, and the air outlet is communicated with the air flow channel; The main pipe is provided with a mounting hole which penetrates front and back, the ventilation pipe is inserted into the mounting hole, the air outlet on the ventilation pipe is arranged upward, and a vent is formed between the outer side of the ventilation pipe and the inner side wall of the main pipe.

7. The frame according to claim 6, characterized in that: The central axis of the ventilation pipe has an angle of 5-30° with the horizontal plane.

8. The frame according to claim 6, characterized in that: The cross section of the ventilation pipe is non-circular.

9. The frame according to any one of claims 1 to 8, characterized in that: The intermediate frame also includes a counterweight; The counterweight block is arranged in one end of the rear extension pipe section close to the rear frame.

10. A scooter, characterized in that: It comprises any one of the frames of claims 1-9.

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