The utility model discloses a stretch battery compartment and extra-large seat silo of home foreign trade electric bicycle without decoration shell

Abstract

The frame of this domestic and export-oriented electric bicycle features a bare, unadorned, stretched battery compartment and an extra-large seat compartment. The frame is a "wave-shaped W-shaped" submerged beam section. The boat-shaped, three-dimensional battery compartment is stretched and formed, with the armpit recessed downwards to form a wave-fitting armpit platform that fits snugly against the submerged beam section. The inner half of the top of the submerged beam section supports the battery compartment, while the upper part is pressed down by the seat compartment. The seat compartment's support frame has a flat, arched support column, resting on the other half of the wave crest at the top of the submerged beam section. The two compartments can be bare and aesthetically pleasing, even without plastic, eliminating the need for a decorative shell. For compliant electric bicycles, the battery compartment capacity is increased by 50%, and the seat compartment can hold 50kg of rice, significantly improving practicality! For electric motorcycles, the range can reach 200 kilometers, and the pedals can carry 100kg of cargo. Domestically, it is expected to become a mainstay for express delivery and food delivery, while in the export market, it can largely replace gasoline-powered motorcycles, reducing emissions. Although the battery compartment is left exposed, its enhanced anti-theft features, combined with a water-tight sealing strip, still achieve a double waterproofing mechanism, both inside and out.

Description

Technical Field This invention relates to electric bicycles, and particularly to the frame structure, battery compartment, and seat compartment. Background Technology

[0001] The practical effectiveness of electric vehicles mainly lies in two aspects: firstly, the battery range must be long enough, and secondly, the storage compartment on the seat must be large enough—essentially, both compartments must have sufficient capacity: the battery compartment and the seat compartment. The seat compartment alone must be large enough to hold a helmet, raincoat, and charger. However, existing models generally suffer from the following problems: 1. Insufficient capacity in both compartments; 2. Excessive packaging, mimicking electric motorcycles, with plastic body shells covering almost the entire vehicle, especially around the rear center of gravity. Summary of the Invention

[0002] Our goal is to develop and design a scooter with a bare, open-frame design, capable of expanding the battery compartment and increasing efficiency, while ensuring that the exposed battery compartment and seat, with their rounded corners and textured surfaces, are strong enough, waterproof, and theft-proof, without sacrificing aesthetics. As you know, the frame of a scooter, where the battery is located under the footrest, is generally divided into three sections: a central section with two side beams, a front beam triangular section that converges at the headstock (forming the front beam triangular area), and a rearward-curving section. The central beam section is the most important part for cushioning impacts and supporting the battery compartment and footrests; it is essentially a "impact-absorbing and footrest-supporting" beam section. Conventional beam sections are often "checkmark" shaped: a wave base and trough, sloping out towards the rearward section. Conventional battery compartments are straight-walled, right-angled square boxes made using shearing and folding methods, supported by two U-shaped support bars extending from the connecting rods at both ends of the beam section. This simple square box needs to be concealed. Our invention began with the submerged beam section. The innovative frame, along with its supporting innovative battery compartment and innovative seat cylinder system, work together to realize the invention concept. The technical solution of this invention is:

[0003] A frame-type electric bicycle with the battery located under the pedals comprises a frame, a battery compartment and seat compartment supported by a frame beam section, two wheels, handlebars, a braking system, a controller, and a battery pack. Its distinguishing feature is that: 1. The frame beam section is a "W-shaped" beam section 1, divided into three sections. Based on the traditionally existing front trough 2 (generally, frames only have a front trough), the rear end of the beam section first extends and bends downwards to form a rear trough 3, then extends upwards and backwards to become a rear section 4. Between the front and rear troughs, near the rear trough, a new peak 5 rises, forming a "one peak, two troughs" configuration, making the beam section a non-sinusoidal, irregular waveform "W-shaped" beam section 1.

[0004] Second, the bare battery compartment 6 and its pedal-type cover 11 are manufactured using a stretching process. The two sides of the battery compartment 6 are recessed downwards, forming a wave-fitting platform 7 at the top that fits the "W-shaped" sunken beam section. The bottom and walls of the compartment are also reinforced with ribs, forming concave ribs 8 on the walls and longitudinal ribs on the bottom. A ring of roller ribs 9 is formed by rolling inwards at the edge of the battery compartment. The top of the concave roller ribs 9 forms a watertight pressure strip support platform 14 on the inner wall of the compartment, supporting a ring of watertight pressure strips inside the compartment. In addition to the horizontal ribs 12, the pedal-type cover 11 also has a ring of cover edge ribs 13 formed downwards on the inner circumference of its edge. The outer wall of the cover and the downward-curving edge of the cover form the cover edge. The internal watertight pressure strip top arch 15; after the compartment and cover are fastened together with screws and weather-resistant waterproof silicone gaskets, the watertight pressure strip bottom platform 14 of the battery compartment and the watertight pressure strip top arch 15 of the compartment cover together clamp and stabilize the soft watertight pressure strip 17, which is glued to the bottom platform 14 by the pressure strip adhesive layer 16, to achieve the internal waterproof mechanism of the compartment opening; the excess gap between the upper edge of the roller rib 8 and the edge of the compartment cover is sealed with sealing glue 18 to complete the external waterproof mechanism of the compartment opening; the controller 19 is placed inside the battery compartment 6; after the wire passes through the outlet of the battery compartment and the glued wire sleeve 20 is applied, a waterproof cover 21 is glued to the outside to complete the waterproof mechanism of the outlet. Thus, the battery compartment, which is formed by stretching and shaping the four walls and the bottom of the steel plate of a certain thickness, is waterproof, deformation-resistant, and drop-resistant even when exposed. In addition, the addition of the foot pedal compartment cover of the transverse compartment cover ribs further prevents falls. Furthermore, the facade has a textured, three-dimensional, and aesthetically pleasing appearance. It is recommended to use stainless steel plates for construction—especially for the pedal-type compartment cover, which is high-end, elegant, unpainted, and resistant to foot traffic and scratches.

[0005] Third, the bare battery compartment 6 straddles the entire “wave-shaped W” submerged beam section 1, and is directly supported by the submerged beam section.

[0006] IV. The bare seat compartment is supported and protected by its bare support frame 24, which is composed of an arched support column 25, the upper end of which is welded together with a hoop strip to form a hoop 26. The front and rear openings at the lower end of the support column 25 are respectively supported on the crest 5 of the lower beam section of the frame and the top of the beam tube of the rear lifting section 4. The hoop 26 is fitted with an openable saddle 27 by a hinge and a lock. The bottom of the bare seat compartment 33 is divided into a front flat bottom 35 and a rear arched bottom 36. The front flat bottom 35 rests on the pedal-type cover 11 of the rear part of the battery compartment 6, and together with the lower foot of the front support column, presses and locks the pedal-type cover 11. The curvature of the rear arched bottom 36 is the same as that of the rear lifting section 4 of the frame, and it is hidden in it and supported by the support rod 37 between the two rear lifting sections.

[0007] The beneficial effects of this invention are: 1. The front-pressed battery compartment (cover) of the seat compartment effectively utilizes the unused space from the thigh to the heel, expanding the storage capacity and significantly increasing the difficulty of battery theft by opening the cover, thus improving anti-theft performance. 2. The overall center of gravity of the vehicle and the rider is shifted forward and concentrated in the middle, making it more scientific, reasonable, and safer. 3. Expanded battery compartment capacity: First, it increases battery capacity, increases range, and reduces anxiety; second, it reduces the number of charging cycles, lowering the probability of fire; third, it allows for more battery string connections, increasing voltage and efficiency, reducing heat loss, and lowering the probability of fire during driving; fourth, for electric motorcycles mainly for export, the expanded battery compartment is more significant in replacing gasoline motorcycles, reducing emissions, and saving money. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the chassis. Figure 2 This is a side view of the battery compartment (without the cover). Figure 3 This is a top view of the battery compartment's pedal-type cover. Figure 4 It is a three-dimensional view of the cross-section of the battery compartment and its pedal-type cover; Figure 5 This is a schematic diagram of the waterproof mechanism of the battery compartment cover. Figure 6 This is a schematic diagram of the battery compartment's anti-drop design and the waterproofing of the outgoing cables.

[0009] Figure 7 This is a cross-sectional schematic diagram of the support frame for the battery compartment and the pyramid-shaped seat cylinder, which is supported by the ridge crest. Figure 8 , Figure 9 This is a schematic diagram showing the connection between the large opening of the silo support frame and the beam tube at the crest of the chassis. Figure 10 This is a schematic diagram of its pyramid-shaped silo structure. Figure 11 , Figure 12 It is a three-dimensional view of its longitudinal section. Figure 13 This is a top view of the silo (bottom view omitted). Figure 14 This is a 3D view of the support frame. Figure 15 This is a schematic diagram of the pyramid-shaped seating chamber (bottom not shown) and its entry frame. Figure 16 This is a side view of the seating frame of the pyramid-shaped seating chamber (complete). Figure 17 This is a schematic diagram of the wire groove in the rolling section of the vehicle frame beam tube; Figure 18 This is a schematic diagram of the cable tray and cable tray on the inner upper wall of the mudguard tile. Figure 19 This is an overall image of the vehicle model. Figure 20 This is the export version of this model with a front-mounted seat.

[0010] Figure 21 This is a schematic diagram showing the front leg of the support frame of the vertical wall silo type welded to the arch bridge. Figure 22 This is a top view of the entire frame of this cabin-style motorcycle; Figure 23 , Figure 24 This is a schematic diagram of the sheet metal unfolding and blanking process for the silo. Figure 25 , Figure 26 This is a schematic diagram of the welded vertical wall seat compartment falling into the integrated support frame. Figure 27 This is the enhanced export version with a rear-mounted backup battery; Figure 28 This is a schematic diagram of the heavy-duty model.

[0011] Figure 29 This is a schematic diagram showing that the support frame for the stretch silo model only requires one arc-shaped silo support column with its front foot welded to the arch bridge; Figure 30 This is a top view of the entire frame of this model. Figure 31 This is a top view of the stretching silo (the bottom is not shown). Figure 32 This is a three-dimensional view of the support frame and the arch bridge. Figure 33 This is a schematic diagram of a stretchable seat chamber (bottom not shown) with an entry frame. Figure 34 This is a side view of the entire vehicle showing the stretchable seat box (complete) entry frame. Figure 35 This is an overall image of the vehicle model, specifically the rear-mounted version for school children. Detailed Implementation

[0012] First, the frame innovation. The frame needs to be manufactured using a precision CNC tube bending machine. See... Figure 1 The wavy W-shaped bottom beam section 1 (dark color) of this frame is further subdivided into the front trough 2, which is traditionally inherent, and the rear trough 3, which is extended and bent downwards at the rear. The rear trough 3 then extends upwards and backwards to form the rear section 4 of the frame. The bulge immediately in front of the rear trough 3 is the crest 5.

[0013] Second, innovation in the battery compartment. See Figure 2 The battery compartment 6 (without the cover at this time) is made using a steel plate stretching process (1.2mm thick steel plate is sufficient; reinforced versions require 1.5mm or more). Its front and rear ends are boat-shaped, which not only facilitates the smooth flow of steel during stretching but also allows the two ends of the boat-shaped battery compartment to be more concealed within the frame, with less exposed sides, enhancing aesthetics. Reinforcing concave ribs 8 are formed on both sides, especially the lower recess, which forms a wave-fitting armpit 7 on the upper part, conforming to the wave-shaped submerged beam section of the frame. This allows the stretched battery compartment 6 to sink in and be directly supported by the wave-shaped submerged beam section of the frame (instead of the traditional method of first fixing two bottom-supporting U-shaped strips to the front, rear, or sides of the submerged beam section). A ring of roller ribs 9 is formed at the edge of the battery compartment 6 by inward rolling. (The bottom longitudinal ribs 10 will be...) Figure 4 show)

[0014] See Figure 3 The battery compartment pedal-type cover 11 is stamped out using a stainless steel plate with a thickness of more than 1mm. The large corner arrangement is to match the requirements of the roller ribs of the battery compartment under the cover. It can be seen that there are horizontally placed cover ribs 12 and edge ring ribs 13. The screw positions on the periphery and sides (not the top!) are also shown.

[0015] Figure 4 The battery compartment and cover are shown in their closed state (when closed, they are not easily visible). The focus is on reproducing the battery compartment's corrugated armpit platform 7 and roller ribs 9. Besides jointly reinforcing the four walls of the battery compartment, their concave tops form a watertight pressure strip support platform 14 that holds the watertight pressure strip around the inside of the compartment. The longitudinal ribs 10 at the bottom of the compartment are also shown. The edge ribs of the pedal-type cover 11 and the surrounding top sealing arch 15, which forms a watertight pressure strip between the cover's edge, are also highlighted.

[0016] Figure 5 The battery compartment opening features a double waterproofing mechanism with internal and external protection: After the compartment and cover are fastened, the watertight pressure strip base 14 of the battery compartment and the watertight pressure strip top arch 15 of the cover work together to secure and stabilize the soft watertight pressure strip 17, which is adhered to the base 14 and the inner wall of the opening by the pressure strip adhesive layer 16, thus achieving the internal waterproofing mechanism of the compartment opening. The remaining gap between the upper edge of the roller rib 9 and the edge of the cover is sealed with adhesive 18, completing the external waterproofing mechanism of the compartment opening. Note: Custom-made, mass-produced, and glued watertight pressure strips 17 typically have their self-adhesive layer 16 at the bottom. We need to apply adhesive ourselves to the inner wall of the opening above the base strip, then adhere the pressure strip to both sides. Then, with the bottom facing up, use the remaining gap between the upper edge of the roller rib 9 and the edge of the cover to apply sealing adhesive 18.

[0017] Figure 6 First, the controller 19 of this electric motorcycle is located inside the battery compartment. Even though this is a high-powered electric motorcycle, the battery compartment is exposed with a bare metal plate and no plastic wrapping, so heat dissipation is normal and it will not affect the operation of the controller. There are three details to ensure the watertightness of the battery compartment's cable outlet: First, multiple thick and thin wires should be wrapped in a common outer sheath, such as heat shrink tubing, and after passing through the cable sleeve 20, the entire cable sleeve should be sealed with glue; second, although the rear compartment wall is originally boat-shaped and sloping, the wires should still be straightened, facing downwards, and tightly bound to avoid hard lifting, rainwater accumulating at the cable outlet, and the slight risk of seepage; third, a waterproof cover should be attached to the outside of the cable sleeve, such as a semi-bowl-shaped waterproof cover 21 attached to the upper outer perimeter, or a flange seat sleeve 22. This double-layered waterproofing system, both internal and external, along with three detailed waterproofing mechanisms at the cable outlet, not only protects against natural downpours but also ensures that even in the event of sudden flooding or submersion of the battery compartment, the rider can still escape danger by riding for 1,000 meters without water damage. Regarding basic anti-bump features: the battery compartment has simple anti-bump angle brackets 23 welded to the outer walls at both ends, allowing the battery compartment to be pressed and screwed onto the connecting rods at both ends of the frame's lower beam section. This also facilitates the return of the lithium battery, along with its compartment, for warranty repair. The improved anti-theft features are also easily understood.

[0018] In this way, the battery compartment is directly supported by the entire submerged beam section, rather than indirectly by two strips. This achieves three benefits: 1. It allows for reliable, simple, and direct mounting. 2. It expands the battery compartment's capacity. Because this frame has a rear trough, it naturally extends 15-20cm rearward. Therefore, the battery compartment with its rounded corners and three-dimensional walls, created by the rolling process, is much more efficient than the traditional, crudely made right-angled square boxes that require additional injection-molded components and shells to conceal the battery compartment. This not only saves on the shell, showcasing the original aesthetic, but also, by extending 20-25cm rearward, it naturally eliminates the 2cm space occupied by the plastic shell foot pedal system, and raises it by more than 5cm, resulting in a total capacity increase of 30-50%. 3. It allows for a visually appealing, wavy, two-piece, textured battery compartment that can be placed directly without concealment, saving costs. Furthermore, the wavy shape of the battery compartment straddling the beam provides greater stability than a conventional flat mounting solution.

[0019] The storage compartment and seat cylinder have their shells removed, allowing for maximum expansion through exposed placement. We designed three seat cylinder and support frame schemes—representing three models: 1. A novel, inverted V-shaped pyramid with a small opening, large belly, and wide base, featuring a "wide-legged" support frame; 2. A common straight-tube type with an "upright" support frame; 3. A novel, upright V-shaped design with a wide opening and narrow base, featuring a "retractable-legged" support frame. In particular, the 1. pyramid seat cylinder will have the largest capacity and most stable seating structure in this type of small car—its gourd-shaped seat container is blow-molded, and its wide-legged support frame must be supported by specially raised frame beam crests, and cannot be directly welded to the crests! Let's begin:

[0020] (I) First, implement and manufacture the first type: the seat compartment system of this pedal-mounted motorcycle with a pyramid-shaped seat compartment. See Figure 7 The support frame 24 with its "wide-opening" design requires the first preparation of arched support columns 25. These columns are formed by welding the upper ends of four arched support columns 25 together to create a clamp 26. A hinged and latched saddle 27 is then installed on the clamp 26. It is evident that the frame's crest 4 supports both the battery compartment 6 and the pyramid-shaped seat frame 24. Since nearly half of the inner and upper side of the beam tube in the middle section of the frame is already used to support the battery compartment, a lap bracket 28 must be welded at this foot to share the support frame 24 with the remaining beam tube area. A foot pad 29 is also welded under the support column 25. For simplicity and symmetry, both the front and rear feet are treated similarly. After the clamps are inserted into the gourd-shaped seat, they are secured with screws. A concealed yet practical folding footrest 30 can be installed here.

[0021] Book Figure 7Finally, two details are shown: A. The lithium battery pack 31 of this vehicle uses stacked, square (soft-pack) cells, arranged in a flat stack. Explanation: 1. Horizontal stacking ensures each cell bears full pressure, rather than vertical stacking that only allows pressure on the sides—which would damage the electrode layer and separator structure, causing short circuits. 2. Hard-shell cylindrical cells using the winding process are not pressure-resistant and are not used—in fact, this type has gradually been phased out of the power battery field—their advantage is only convenient fully automated cell production and welding into packs, resulting in low cost for mass production, but they cannot be fully filled, wasting space, have low energy density, and the metal casing accounts for a large proportion of weight. Such a soft-pack battery pack can withstand 100 kg of pressure on its own! The battery pack is then fully supported and the pedal-type compartment cover is tightened to ensure that the pedal-type compartment cover will not collapse or deform. The pack, cover, and frame can collectively withstand more than 200 kg of pressure! B. The gaps between the underarm platform and the upper sides of the battery pack 31 can be used to insert support blocks 32, which help the shell-like compartment body resist deformation and prevent falls. In terms of collision protection, there is no need to worry. Most of the battery compartment is hidden in the submerged beam section, especially the bottom of the two end compartments, which are protected by the front and rear troughs.

[0022] Figure 8 , Figure 9 yes Figure 7 The detailed view clearly shows that the arched breech support column is a specially made crescent-shaped tubular breech support column 25, the overlapping corner bracket 28, and the foot pad 29. The screwing relationship between the large opening of the breech support frame and the beam tube at the 5 crests of the frame can also be seen.

[0023] Now let's look at the seat compartment of this model. Figure 10 The pyramid-shaped silo 33 has a front wall 34 that is an arched surface facing the wind; its bottom is divided into two parts, namely the front flat bottom 35 and the rear arched bottom 36. Figure 11 , Figure 12 Show its longitudinal section, in which Figure 12 This indicates that the rear arch bottom 36 will be supported by the support rod 37 between the rear sections of the frame. It can also be seen that a drip line can be made on the lower edge of its rear wall. Figure 13 This is a top view of the silo 33 (the complex two types of bottoms are omitted).

[0024] Figure 14 Details can be seen in the clamp 26, foot pad 29, and protective arch 38 of the support frame 24. This container is made of plastic and must be protective and durable. The convex front wall, especially the lower front, should have a skirting board. Figure 15 The pyramid-shaped seating compartment (bottom not shown) is shown in the seat frame. Figure 16This is a side view of the pyramid-shaped seat compartment (complete) within the frame. It also shows that if more investment is made and the compartment is manufactured using injection molding, it's easier to add internal ribs 39, increasing the compartment wall strength and concealing them inside the container, unlike external ribs which are prone to dust accumulation and difficult to clean. It also shows that the seat compartment opening can be placed sideways into a helmet. After installation and mounting on the frame, the four walls of the compartment are secured by the support frame. The front flat compartment bottom 35 rests against the rear part of the battery compartment 6's foot pedal-type cover 11, together with the lower end of the front armrest, pressing and locking the foot pedal-type cover, enhancing battery anti-theft capabilities. The curvature of the arc-shaped compartment bottom 36 is the same as the rear section 4 of the frame, concealed within it.

[0025] Finally, the arrangement and aesthetic concealment of clues related to the bare frame and battery compartment without a casing are addressed as follows: See Figure 17 Before CNC bending, a section of beam tube with a 40mm cable tray is rolled out for the front beam and rear boom sections (both ends of the battery compartment). Especially in the rear section, the bus leading from the rear wheel to the controller in the battery compartment is very thick (including three-phase thick wires, Hall effect thin wires, etc.), so the cable tray needs to be wider and deeper—which actually enhances the strength of this part. The power lines to the front and rear lights are very thin, and the beam tube cable tray on the frame tube can be omitted or not rolled out. Figure 18 The mud-retaining tile groove 41 shown on the inner wall of the mud-retaining tile should be thin and shallow. The mud-retaining tile can be stretched using aluminum plates. For these thick and thin wires, which require slightly higher cost, a silicone outer sheath 42 should be used: 1. weather-resistant; 2. high elasticity and friction. After being pressed into the groove, it will be flat and not easily bulge or come out; a few cable ties will suffice. Alternatively, when laying the wires, apply a small amount of instant adhesive section by section, which will basically fix them within the groove. For full coverage, apply glass glue or curtain wall structural adhesive.

[0026] Figure 19 This is an overall view of the model after installation, showing the folding footrests 30, the strut bar 37, and the protective arch bar 38. The dotted lines on the rear wall of the seat compartment and the bottom of the rear arched compartment indicate that they are hidden behind the curved strut post and rear riser tube, ensuring both an aesthetically pleasing appearance and protection. It is evident that the pyramid-shaped seat compartment of this first model with its "wide-opening" support frame has a large capacity. Figure 20 This design features a front-mounted seat, demonstrating the opening and closing of the saddle and the markings and reinforcement on the two outer walls (rear wall) of the seat compartment. However, the construction of the support frame and the screwing in of the small-opening, large-belly seat compartment are slightly time-consuming and costly. The two models described below allow the seat compartment to be directly seated into the frame, and the support frame can be directly welded to the frame, then acid-washed and painted together, which is less labor-intensive, more robust, and cheaper.

[0027] (II) Second Section: Convenient wall-mounted seat compartment with an "upright" support frame. To make the seat compartment more aesthetically pleasing and better suited for open-crotch seating and legroom, some volume must be sacrificed, requiring the initial construction of a bridging mechanism—see... Figure 21First, weld an arch bridge 43 to the top of the wave crest 5 under the front foot, and then weld two front feet onto the arch bridge 43. Figure 22 The image shows the projected shape of the vertical wall-mounted seat cylinder 44, with the dotted line in front representing the forward protrusion of the saddle. Also visible is the arch bridge 43, and attention should be paid to the angles, placement, and welding positions of the four crescent-shaped support columns 25. Nearly half of the frame's subsidence section supports the battery compartment, with one half supporting the battery and the other half supporting the seat cylinder. Our custom-designed arched support columns are not only aesthetically pleasing, but also allow for a flattened arc shape to support the remaining half of the frame tube. Using standard, readily available round or square tubing and angle steel would not only be unsightly, but more importantly, there would be nowhere to place them.

[0028] Figure 23 , Figure 24 , Figure 25 It is explained that for this vertically oriented, vertically oriented cargo bin, ordinary small and medium-sized car manufacturers do not need to spend money on mold making and outsource to plastic factories. They can use 0.6mm thin steel plates or 1mm aluminum plates and use ordinary punching and shearing machines to cut, bend, and weld the materials to form the bin. The sharp edges of the outer wall will be concealed within the bin support columns of the seat frame, and sealed with sealant or putty. Figure 26 This is the integrated frame of the support seat, which also showcases the 37-inch support strut.

[0029] This model is primarily designed for electric motorcycles and heavy-duty applications. Figure 27 The wheels are larger, the frame is thicker and higher, and the battery compartment is also raised to accommodate a 60V 50Ah lithium iron phosphate battery or a 60V 70Ah ternary lithium battery. The frame can be welded with a standard U-shaped support bar (45mm). A reinforced upright support has been added. The rear motor wheel uses a motor with a rated power of 1200W or higher. It can carry 100 kg of cargo and passengers, with a range of over 120 km. Using a more expensive ternary lithium battery, it can travel 150 km, sufficient for a day's work. a. Agricultural use: Tricycles are inconvenient for reaching fields, and farming is mostly done by the elderly, making tricycle driving dangerous. This electric motorcycle has sufficient capacity for transporting fertilizer and harvesting grains and vegetables. b. Can be used for express delivery: Existing express delivery tricycles are stop-and-go, affecting road traffic. In fact, the proportion of large and long cargo is extremely low; most are small boxes and parcels. This vehicle is quick-responding, maneuverable, and can carry more and run faster, improving the overall efficiency of the logistics and express delivery industry. c. Backup power version: A 46L ternary lithium battery can be added, providing approximately 80km of range. Combined with the main battery in the battery compartment, the total range is 200km. Furthermore, adding two more backup batteries in the seat compartment extends the range to 500km. Figure 28 To illustrate: 1. The front wall of this seat compartment is straight, which makes it easy to spread goods on the footrest; 2. If it is a plastic compartment, it can be lined with wire mesh.

[0030] (III) The third item: V-shaped bucket-type silo made of deep-drawn metal plate, equipped with a support frame that is larger at the top and smaller at the bottom. Figure 29 It is shown that only one arc plate support column 47 is welded to the top of the arch bridge 43. Figure 30The three-legged tripod is immediately visible; the three dotted lines inside the cabin indicate the three arc-shaped support columns 46, meaning that the front arc plate is welded to the arch bridge, and the two rear arc plates are welded to the rear lifting section of the frame and the additional flat bridge 48, which together bear the load. Figure 31 This is a deeply drawn V-shaped bucket-type silo (the bottom of the silo is not shown). Figure 32 This shows the three-legged support frame of the V-shaped bucket silo and the arch bridge 43 supporting the front arc plate silo column. Figure 33 The V-shaped bucket-type silo is shown to be embedded in its support frame. Figure 34 The vehicle's support frame is welded to the chassis as a single unit. The saddle is unscrewed and the vehicle is lowered into the V-shaped bucket-type seat compartment. Although the support frame is slightly wider at the top than at the bottom, from a mechanical point of view, it is actually more stable than the box frame structure. Figure 35 This is the overall effect of this model, designed for families. As you can see, the extended seat cavity depth is limited, requiring a high-profile saddle. The extended rear seat support 49 on the rear swing section provides greater stability. It features full rear fender protection and foot guards.

Claims

1. An electric bicycle with the battery located under the pedals, comprising a frame, a battery compartment and seat compartment supported by a frame beam section, two wheels, handlebars, a braking system, a controller, and a battery pack, characterized in that: First, the frame's lower beam section is a "W-shaped" lower beam section 1, divided into three sections. Based on the front end of the lower beam section, which is traditionally the inherent front trough 2 (generally, the frame only has a front trough), the rear end of the lower beam section is first extended and bent downward to form a rear trough 3, and then projected upward and backward to become the rear rise section 4. In the middle of the front and rear troughs, near the rear trough, a new peak 5 is raised, forming "one peak and two troughs", making the lower beam section a "W-shaped" lower beam section 1. Second, the bare battery compartment 6 and its pedal-type cover 11 are manufactured using a stretching process. The two sides of the battery compartment 6 are recessed downwards, forming a wave-fitting platform 7 at the top that fits the "W-shaped" sunken beam section. The bottom and walls of the compartment are also reinforced with ribs, forming concave ribs 8 on the walls and longitudinal ribs 10 on the bottom. A ring of roller ribs 9 is formed by rolling inwards at the edge of the battery compartment. The top of the concave roller ribs 9 forms a watertight pressure strip support platform 14 on the inner wall of the compartment, supporting a ring of watertight pressure strips inside the compartment. The pedal-type cover 11 has a cover transverse rib 12, and a ring of cover edge ribs 13 is formed downwards on the inner circumference of its edge. The outer wall of the cover and the downward-curving edge of the cover form a watertight pressure strip support platform 14 inside the cover edge. The top sealing arch 15 of the pressure strip; after the compartment and cover are fastened together with screws and weather-resistant waterproof silicone gaskets, the water-tight pressure strip base edge 14 of the battery compartment and the water-tight pressure strip top sealing arch 15 of the compartment cover will work together to hold and stabilize the soft water-tight pressure strip 17, which is glued to the base edge 14 by the pressure strip adhesive layer 16, to achieve the internal waterproof mechanism of the compartment opening; the excess gap between the upper edge of the roller rib 8 and the edge of the compartment cover is sealed with sealing glue 18 to complete the external waterproof mechanism of the compartment opening; the controller 19 is placed inside the battery compartment 6; after the wire passes through the outlet of the battery compartment and the protective sleeve 20 is coated with glue, a waterproof cover 21 is glued to the outside to complete the external waterproof mechanism of the outlet; Third, the bare battery compartment 6 straddles the entire "wave-shaped W" sunken beam section 1, and is directly supported by the sunken beam section; IV. The bare seat compartment is supported and protected by its bare support frame 24, which is composed of an arched support column 25, the upper end of which is welded together with a hoop strip to form a hoop 26. The front and rear openings at the lower end of the support column 25 are respectively supported on the crest 5 of the lower beam section of the frame and the top of the beam tube of the rear lifting section 4. The hoop 26 is fitted with an openable saddle 27 by a hinge and a lock. The bottom of the bare seat compartment is divided into a front flat bottom 35 and a rear arched bottom 36. The front flat bottom 35 rests on the pedal-type cover 11 of the rear part of the battery compartment 6, and together with the lower foot of the front support column, presses and locks the pedal-type cover 11. The curvature of the rear arched bottom 36 is the same as that of the rear lifting section 4 of the frame, and is hidden therein, supported by the support rod 37 between the two rear lifting sections.

2. The electric bicycle according to claim 1, characterized in that: The battery compartment is boat-shaped at both ends, and the frame beam tube is rolled with a 40mm wire groove.

3. The electric bicycle according to claim 1, characterized in that: The cabin is a pyramid-shaped cabin, and its support frame uses four crescent tube support columns, which are "large open feet". Foot pads 29 are welded under the feet and screwed to the lap brackets 28 welded to the top of the frame crest and the top of the beam tube of the rear section.

4. The electric bicycle according to claim 1, characterized in that: The seat is a vertically oriented, narrow-at-the-front and wide-at-the-rear design. Its support frame uses four crescent-shaped support columns and has an "upright" lower leg. At the crest of the frame, the arch bridge 43 is welded first, followed by the two front legs of the narrowed support frame. The two rear legs are directly welded to the top of the beam tube of the rear swing section, making the frame an integrated support frame frame. The vertically oriented seat is directly seated into the support frame of the frame and is enclosed by the saddle.

5. The electric bicycle according to claim 1, characterized in that: The seat is a V-shaped bucket-type seat made of deep-drawn metal. Its support frame adopts three arc plate support columns 47 standing on three legs, with a "V" shape that is "wider at the top and narrower at the bottom". Only one front arc plate support column needs to be welded to the arch bridge, while the two rear arc plate support columns are welded to the rear section of the frame and the additional flat bridge 48.

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