Long-endurance new energy sightseeing vehicle based on efficient permanent magnet synchronous motor

Abstract

The long-endurance new energy sightseeing vehicle based on the efficient permanent magnet synchronous motor comprises a storage bin shell, a storage bin is arranged in the storage bin shell, a rubber baffle is fixedly connected to the outer surface of the storage bin, reinforcing ribs penetrate through the interior of the storage bin shell, and the rubber baffle is fixedly connected to the outer surface of the storage bin. A vehicle body shell is fixedly connected to the outer surfaces of the lower ends of the reinforcing ribs, a large part containing groove is formed in the vehicle body shell, hinges are fixedly connected to the outer surface of the large part containing groove, a door plate is fixedly connected to the inner surface of the other end of each hinge, and an integrated door lock penetrates through the interior of the door plate. The side surface of the half axle brake is rotationally connected with an axle; through cooperative use of the components, the device can be flexibly loaded when passengers carry more articles, the sightseeing comfort of tourists is improved, and after the number of the passengers is reduced, the dead weight can be reduced and the energy consumption can be saved in the left space.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy sightseeing vehicles, and in particular to a long-range new energy sightseeing vehicle based on a high-efficiency permanent magnet synchronous motor. Background Art

[0002] In existing technologies, optimizing the chassis structure of sightseeing vehicles to further improve energy efficiency and range by reducing vehicle weight is a common approach. For example, U-shaped steel is used as the chassis' primary load-bearing component, with multiple regularly spaced through-holes defined in the web or wing panels of the U-shaped steel. This design effectively reduces the chassis's weight and the vehicle's curb weight, indirectly improving its range and dynamic response.

[0003] However, the existing design concept based on "opening holes to reduce weight" suffers from a significant limitation: its design objective is too singular, focusing solely on weight reduction. These through-holes created in the U-shaped steel are often viewed merely as "hollow areas" for weight reduction, their potential spatial utilization value completely overlooked. In actual operational scenarios, especially in scenic areas or campuses, passengers (tourists, teachers, and students) often carry various items of varying sizes, such as backpacks, handbags, small suitcases, photographic equipment, and even strollers. These holes in the existing chassis structure are not assigned any functional purpose and remain unused, failing to provide passengers with flexible and convenient additional cargo space. This results in: 1. Insufficient storage space: When passengers carry a large number of items or bulky items, the limited space under seats or in luggage racks within the vehicle compartment may be stretched, affecting passenger comfort and even potentially obstructing aisles due to the stacked items, posing a safety hazard. 2. Wasted space resources: The internal space of the holes, carefully designed for weight reduction, is not effectively utilized, resulting in a substantial waste of structural space resources. 3. Lack of functional flexibility: The chassis structure lacks adaptability to diverse loading needs and cannot flexibly expand or adjust storage capacity according to actual needs.

[0004] Therefore, an innovative structural design is urgently needed. While inheriting the lightweight advantages of the existing "opening holes" method, it can also break through the limitations of a single function and cleverly transform these weight-reducing holes into usable cargo space, achieving the dual goals of "weight reduction" and "capacity increase." Such a design will not only further optimize the vehicle's energy efficiency, but also significantly enhance the practicality of sightseeing vehicles and passenger comfort, solving the practical pain points of passengers carrying items, thereby more comprehensively meeting the operational needs of green sightseeing vehicles. Summary of the Invention

[0005] This invention aims to overcome the functional limitations of existing lightweight chassis designs for new energy sightseeing vehicles. Specifically, it aims to provide an innovative structural design that achieves chassis lightweighting, improving energy efficiency and range, while cleverly converting this weight reduction into usable cargo space. Furthermore, it introduces a new energy sightseeing vehicle with enhanced functionality and a long range, powered by a high-efficiency permanent magnet synchronous motor.

[0006] The present invention provides a long-range new energy sightseeing vehicle based on a high-efficiency permanent magnet synchronous motor, comprising: a vehicle body shell formed by stamping a lightweight aluminum alloy sheet and splicing it with an argon arc welding process; a storage bin shell fixedly connected to the upper portion of the vehicle body shell and made of the same lightweight aluminum alloy material, wherein a storage bin is formed inside the storage bin shell, and a weather-resistant EPDM rubber baffle with a double-layer sealing structure is fixedly connected to the opening edge of the storage bin; a plurality of longitudinal and transverse reinforcing ribs running through the storage bin shell and the vehicle body shell, wherein the reinforcing ribs are arranged in a crisscross pattern and are aligned with the storage bin shell and the vehicle body shell The inner wall of the body is integrally extruded, and the cross-section of the reinforcing rib is I-shaped or groove-shaped; the inner side wall of the body shell is integrally formed or welded with a recessed large-item placement slot for placing large items, and the opening edge of the large-item placement slot is rotatably connected to a door panel via a stainless steel hinge. The door panel adopts a composite sandwich structure with a surface layer of rust-proof steel plate and an embedded lightweight and high-strength aluminum alloy honeycomb core, and the edge of the door panel is provided with a sealing strip installation slot that cooperates with the rubber baffle; an integrated door lock is installed throughout the interior of the door panel, and the lock tongue of the integrated door lock cooperates with the corresponding lock hole on the body shell to achieve locking. The key structural components of the vehicle of the present invention are all made of high-strength lightweight materials and optimized design, which greatly reduces the curb weight of the vehicle. For electric vehicles, this directly reduces the energy consumption required for driving and significantly improves the cruising range on a single charge, which meets the core demand of "long cruising range". In particular, the crisscross pattern of reinforcing ribs forms an efficient skeleton structure at key vehicle body locations, significantly enhancing the vehicle's overall rigidity and strength. This not only improves the vehicle's driving stability and handling in complex road conditions (such as bumpy roads in scenic areas), but more importantly, it enhances the vehicle's collision resistance and improves passive safety. It should also be noted that the synergistic effect of the double-layer EPDM rubber baffle and the door panel edge sealing strips creates a multi-layered, reliable sealing barrier at the storage compartment opening, effectively preventing external pollutants such as rain, dust, and mud from invading the storage compartment, keeping stored items (especially tourist luggage) clean and dry. The weather-resistant EPDM rubber ensures the durability and sealing effectiveness of the seals in long-term exposure to sunlight, rain, and high and low temperature fluctuations, extending their service life. The honeycomb core structure achieves lightweighting while ensuring the rigidity and impact resistance of the door panels. The rust-resistant steel plate on the surface effectively resists environmental corrosion. The stainless steel hinges avoid rust and jamming, ensuring smooth and reliable opening and closing of the door panels. It is also particularly important to note that the use of argon arc welding technology can provide high-quality, high-strength welded joints, ensuring the firmness and long-term reliability of the connection between the main structural components of the vehicle body (shell, reinforcement ribs), which is crucial to the structural integrity and safety of the entire vehicle. One-piece extrusion molding avoids connection problems and has better integrity.

[0007] According to the present invention, a long-range new energy sightseeing vehicle based on a high-efficiency permanent magnet synchronous motor features a storage compartment housing with an anti-corrosion and heat-insulating cover plate made of a glass fiber-reinforced resin-based composite material fixedly attached to its upper surface, and reinforcing ribs fixedly attached to its lower surface. The coordinated use of these components ensures a robust structure.

[0008] According to the present invention, a long-range new energy sightseeing vehicle based on a high-efficiency permanent magnet synchronous motor is provided. The lower edge of the anti-corrosion and heat-insulating cover plate is fixedly connected to the upper surface of the vehicle body shell. The lower surface of the vehicle body shell is fixedly connected to a power storage module, and the driving system is installed throughout the interior of the vehicle body shell. The coordinated use of these components achieves a rational device structure.

[0009] According to the present invention, a long-range new energy sightseeing vehicle based on a high-efficiency permanent magnet synchronous motor is provided, wherein the interior of the vehicle body shell is respectively penetrated by a front block assembly and a rear block assembly. Through the coordinated use of these components, the device achieves an all-round viewing effect.

[0010] According to the present invention, a long-range new energy sightseeing vehicle based on a high-efficiency permanent magnet synchronous motor is provided. The vehicle body shell is internally provided with a mounting slot and a cabin. The mounting slot is stamped from high-strength steel plate and welded to the chassis structure of the vehicle body shell. A half-axle brake is installed through the mounting slot. The inner surface of the cabin is fixedly connected to the driver's seat and passenger seat, respectively. A support frame composed of tubular alloy profiles is fixedly connected to the outer surfaces of both ends of the cabin. The coordinated use of these components achieves a comfortable ride.

[0011] According to the present invention, a long-range new energy sightseeing vehicle based on a high-efficiency permanent magnet synchronous motor features a movable input end of a half-axle brake fixedly connected to the output end of the high-efficiency permanent magnet synchronous motor. The movable output end of the half-axle brake is tightly attached to the wheel assembly. The side surface of the half-axle brake housing is rotatably connected to the axle, and both ends of the axle are fixedly connected to the chassis longitudinal beams of the vehicle body. The coordinated use of these components ensures a robust structure.

[0012] According to the present invention, a long-range new energy sightseeing vehicle based on a high-efficiency permanent magnet synchronous motor is provided. The wheel hub of the wheel assembly and the output flange of the axle brake, as well as the mounting base and mounting slot of the axle brake, are both secured with high-strength threaded bolts. The coordinated use of these components achieves a rationally designed device.

[0013] According to the present invention, a long-range new energy sightseeing vehicle based on a high-efficiency permanent magnet synchronous motor has a front-end collision avoidance system and a rear-end collision avoidance system fixedly connected to the front and rear outer surfaces of the vehicle body. Both systems monitor the distance and relative speed of objects ahead to trigger braking or avoidance mechanisms in advance. This method is a prior art. The coordinated use of these components achieves the effect of active collision avoidance.

[0014] According to the present invention, a long-range new energy sightseeing vehicle based on a high-efficiency permanent magnet synchronous motor features a flange structure at each end fixedly connected to the chassis longitudinal beams of the vehicle body shell. The flanges are provided with multiple mounting holes and fastened with high-strength bolts. The flange structure provides greater connection stability, while the combination with the chassis longitudinal beam connection minimizes space usage.

[0015] According to a long-range new energy sightseeing vehicle based on a high-efficiency permanent magnet synchronous motor provided by the present invention, the hub of the wheel assembly is made of forged aluminum alloy, and the tread thereof is made of a rubber material with a low rolling resistance formula.

[0016] The present invention has the following beneficial effects compared to the prior art:

[0017] 1. Dual improvement in lightweighting and space utilization: Based on the successful inheritance of weight-reduction design and the effective reduction of chassis and vehicle weight, this invention creatively endows the weight-reduction through-holes with the value of functional cargo space. This design turns "waste" into "treasure" and significantly improves the space utilization efficiency of the chassis area without adding almost any additional materials or weight. It solves the problem of the original design that only focused on weight reduction but ignored the utilization of space resources.

[0018] 2. Enhanced flexible loading capacity and improved user experience: By designing available loading spaces, the adaptability and flexibility of sightseeing buses for passengers' belongings are greatly enhanced. Passengers can conveniently place carry-on luggage, backpacks, and even small folding strollers in these spaces, effectively alleviating the pressure on storage space in the car, avoiding the situation where items are piled up in a messy manner or occupying aisles, and significantly improving passengers' riding comfort and convenience.

[0019] 3. Optimize the overall vehicle layout and practicality: The newly added cargo space is usually located under or on the side of the chassis, which rationally utilizes the non-passenger area of the vehicle, helps to keep the interior of the vehicle clean and spacious, further optimizes the overall vehicle space layout, and enhances the practicality and functionality of the sightseeing vehicle.

[0020] 4. Simple, reliable structure, easy to implement: The design concept is clear, and innovative functions are extended on the existing mature chassis structure without introducing overly complex additional devices or significantly changing the production process. The implementation cost is relatively low, the structure is highly reliable, and it is easy to promote and apply in the existing manufacturing system.

[0021] 5. Improve operational efficiency and satisfaction: A more comfortable user experience, a cleaner cabin environment, and indirect efficiency gains due to better space utilization will help improve passenger satisfaction and may increase vehicle turnover and operational efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0023] Figure 1 This is a front view of a long-range new energy sightseeing vehicle based on a high-efficiency permanent magnet synchronous motor according to the present invention;

[0024] Figure 2 This is a three-dimensional diagram of a long-range new energy sightseeing vehicle based on a high-efficiency permanent magnet synchronous motor according to the present invention;

[0025] Figure 3 This is a front view of a long-range new energy sightseeing vehicle based on a high-efficiency permanent magnet synchronous motor according to the present invention;

[0026] Figure 4 This is a top view of a long-range new energy sightseeing vehicle based on a high-efficiency permanent magnet synchronous motor according to the present invention;

[0027] Figure 5 This is a left view of a long-range new energy sightseeing vehicle based on a high-efficiency permanent magnet synchronous motor according to the present invention.

[0028] Legend:

[0029] 1. Storage compartment shell; 2. Anti-corrosion and heat-insulating cover; 3. Reinforcement ribs; 4. Support frame; 5. Front block assembly; 6. Front-end anti-collision system; 7. Rear-end anti-collision system; 8. Cockpit; 9. Rear block assembly; 10. Power storage module; 11. Driving system; 12. Driver's seat; 13. Passenger seat; 14. Wheel assembly; 15. Mounting slot; 16. Bolts; 17. Axle brake; 18. Axle; 19. High-efficiency permanent magnet synchronous motor; 20. Storage compartment; 21. Rubber baffle; 22. Large item placement slot; 23. Hinge; 24. Door panel; 25. Integrated door lock; 26. Body shell. DETAILED DESCRIPTION

[0030] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it should not be understood as a limitation on the scope of protection of the present invention.

[0031] Reference Figure 1 、 Figure 2 、 Figure 3 and Figure 5 The present invention relates to a long-range new energy sightseeing vehicle based on a high-efficiency permanent magnet synchronous motor, comprising: a body shell 26 formed by stamping a lightweight aluminum alloy sheet and splicing it with an argon arc welding process; a storage bin shell 1 fixedly connected to the upper portion of the body shell 26 and made of the same lightweight aluminum alloy material, wherein a storage bin 20 is formed inside the storage bin shell 1, and a weather-resistant EPDM rubber baffle 21 with a double-layer sealing structure is fixedly connected to the opening edge of the storage bin 20; a plurality of longitudinal and transverse reinforcing ribs 3 running through the storage bin shell 1 and the body shell 26, wherein the reinforcing ribs 3 are arranged in a crisscross pattern and are in contact with the inner portions of the storage bin shell 1 and the body shell 26 The wall is extruded as a whole, and the cross-section of the reinforcing rib 3 is I-shaped or groove-shaped; the inner side wall of the body shell 26 is integrally formed or welded with a recessed large-item placement groove 22 for placing large items, and the opening edge of the large-item placement groove 22 is rotatably connected to the door panel 24 through a stainless steel hinge 23. The door panel 24 adopts a composite sandwich structure with an anti-rust steel plate on the surface and a lightweight and high-strength aluminum alloy honeycomb core embedded in it, and a sealing strip installation groove is provided on the edge of the door panel 24 to cooperate with the rubber baffle 21; an integrated door lock 25 is installed inside the door panel 24, and the lock tongue of the integrated door lock 25 cooperates with the corresponding lock hole on the body shell 26 to achieve locking. The upper surface of the storage bin shell 1 is fixedly connected with an anti-corrosion and heat-insulating cover plate 2, and the lower surface of the anti-corrosion and heat-insulating cover plate 2 is fixedly connected with a reinforcing rib 3; the lower surface of the anti-corrosion and heat-insulating cover plate 2 is fixedly connected with a vehicle body shell 26, and the lower surface of the vehicle body shell 26 is fixedly connected with a power storage module 10, and the interior of the vehicle body shell 26 is penetrated by a driving system 11; the interior of the vehicle body shell 26 is penetrated by a front block assembly 5 and a rear block assembly 9 respectively; the interior of the vehicle body shell 26 is provided with an installation groove 15 and a cockpit 8, and the interior of the installation groove 15 is penetrated by a half-axle brake 17, and the half-axle brake 17 brakes the half-axle by sensing the change in the speed of the half-axle and generating a corresponding braking torque. This method is a prior art, and the inner surface of the cockpit 8 is fixedly connected with a driver's seat 12 and a passenger seat 13 respectively, and the outer surfaces of both ends of the cockpit 8 are fixedly connected with a support frame 4.

[0032] During use, tourists can place smaller packages they carry inside the storage compartment 20, which will be blocked by the rubber baffle 21 to prevent the items from falling. At the same time, large items can be placed inside the large item placement slot 22, which will be further locked by the integrated door lock 25 on the door panel 24.

[0033] Reference Figure 1 、 Figure 2 、 Figure 3 and Figure 4 The movable end of the half-axle brake 17 is fixedly connected to the output end of the high-efficiency permanent magnet synchronous motor 19. The high-efficiency permanent magnet synchronous motor 19 can significantly improve the conversion efficiency of electrical energy and mechanical energy by optimizing the material ratio and magnetic field distribution of the permanent magnet. This method is a prior art. The other movable end of the half-axle brake 17 is tightly fitted with the wheel assembly 14. The side surface of the half-axle brake 17 is rotatably connected to the axle 18, and the side surface of the axle 18 is fixedly connected to the body shell 26; the interior of the wheel assembly 14 and the half-axle brake 17 are both threadedly connected with bolts 16; the outer surface of the body shell 26 is respectively fixedly connected to the front-end collision avoidance system 6 and the rear-end collision avoidance system 7. The front-end collision avoidance system 6 and the rear-end collision avoidance system 7 can trigger the braking or avoidance mechanism in advance by monitoring the distance and relative speed changes of the object in front.

[0034] In the present invention, the side surface of the half-axle brake 17 is rotatably connected to the axle 18, and the axle 18 is then fixed to the vehicle body shell 26 to form a firm connection. Ultimately, the device can be flexibly loaded when passengers carry a large number of items, thereby improving the sightseeing comfort of tourists, reducing the weight and making flexible use of space.

[0035] During design, the ends of the axle 18 are fixedly connected to the chassis longitudinal beams of the vehicle body 26 via flange structures. The flanges are provided with multiple mounting holes and are fastened with high-strength bolts. The hub of the wheel assembly 14 is made of forged aluminum alloy, and its tread is made of a low-rolling-resistance rubber material.

[0036] Working principle: During use, tourists can place smaller packages they carry with them inside the storage compartment 20, which will be blocked by the rubber baffle 21 to prevent the items from falling. At the same time, large items can be placed inside the large item placement slot 22, and further locked by the integrated door lock 25 on the door panel 24. The side surface of the half-axle brake 17 is rotated and connected to the axle 18, and then the axle 18 is fixed to the vehicle body shell 26 to form a firm connection. Finally, the device can be flexibly loaded when encountering passengers carrying more items, thereby improving the sightseeing comfort of tourists, reducing the weight and being flexible and convenient for space.

[0037] The present invention successfully achieves the effect of "reducing weight without reducing volume, and increasing storage space". While maintaining the core advantages of long-range sightseeing vehicles, such as green environmental protection and high efficiency and energy saving, it significantly improves their spatial practicality and user-friendliness, and has outstanding comprehensive benefits and market competitiveness.

[0038] It should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the technical solution. Although the applicant has described the present invention in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that those modifications or equivalent substitutions of the technical solution of the present invention cannot depart from the purpose and scope of the technical solution of the present invention and should be covered by the scope of the claims of the present invention.

Claims

1. A long-range new energy sightseeing vehicle based on a high-efficiency permanent magnet synchronous motor, characterized in that: include: A vehicle body shell (26) formed by stamping lightweight aluminum alloy plates and splicing them using an argon arc welding process; A storage bin shell (1) is fixedly connected to the upper part of the vehicle body shell (26) and is made of the same lightweight aluminum alloy material. A storage bin (20) is formed inside the storage bin shell (1). The opening edge of the storage bin (20) is fixedly connected to a weather-resistant EPDM rubber baffle (21) with a double-layer sealing structure; a plurality of longitudinal and transverse reinforcing ribs (3) are passed through the storage bin shell (1) and the vehicle body shell (26). The reinforcing ribs (3) are arranged in a well shape and are extruded integrally with the inner walls of the storage bin shell (1) and the vehicle body shell (26). The cross section of the reinforcing ribs (3) is an I-shaped or groove-shaped; the vehicle body shell ( The inner side wall of the vehicle body (26) is integrally formed or welded with a recessed large-item placement slot (22) for placing large items. The opening edge of the large-item placement slot (22) is rotatably connected to a door panel (24) through a stainless steel hinge (23). The door panel (24) adopts a composite sandwich structure with a surface layer of rust-proof steel plate and an embedded lightweight high-strength aluminum alloy honeycomb core, and the edge of the door panel (24) is provided with a sealing strip installation slot that cooperates with the rubber baffle (21); an integrated door lock (25) is installed inside the door panel (24), and the lock tongue of the integrated door lock (25) cooperates with the corresponding lock hole on the vehicle body shell (26) to achieve locking.

2. The long-range new energy sightseeing vehicle based on a high-efficiency permanent magnet synchronous motor according to claim 1 is characterized in that: The upper surface of the storage bin shell (1) is fixedly connected to an anti-corrosion and heat-insulating cover plate (2) made of a glass fiber reinforced resin-based composite material, and the lower surface of the anti-corrosion and heat-insulating cover plate (2) is fixedly connected to the reinforcing ribs (3).

3. The long-range new energy sightseeing vehicle based on a high-efficiency permanent magnet synchronous motor according to claim 2 is characterized in that: The lower surface edge of the anti-corrosion and heat-insulating cover plate (2) is fixedly connected to the upper surface of the vehicle body shell (26); the lower surface of the vehicle body shell (26) is fixedly connected to a power storage module (10); and the interior of the vehicle body shell (26) is penetrated by a driving system (11).

4. The long-range new energy sightseeing vehicle based on a high-efficiency permanent magnet synchronous motor according to claim 1 is characterized in that: A front block assembly (5) and a rear block assembly (9) are respectively installed through the interior of the vehicle body shell (26).

5. The long-range new energy sightseeing vehicle based on a high-efficiency permanent magnet synchronous motor according to claim 1 is characterized in that: The interior of the vehicle body shell (26) is provided with a mounting groove (15) and a cabin (8), the mounting groove (15) is formed by stamping a high-strength steel plate and welded to the chassis structure of the vehicle body shell (26), a half-axle brake (17) is installed through the interior of the mounting groove (15), the inner surface of the cabin (8) is fixedly connected to the driver's seat (12) and the passenger seat (13), and the outer surfaces of both ends of the cabin (8) are fixedly connected to a support frame (4) composed of a tubular alloy profile.

6. The long-range new energy sightseeing vehicle based on a high-efficiency permanent magnet synchronous motor according to claim 5, characterized in that: The movable end of the input end of the half-axle brake (17) is fixedly connected to the output end of the high-efficiency permanent magnet synchronous motor (19), the movable end of the output end of the half-axle brake (17) is tightly fitted with the wheel assembly (14), the side surface of the shell of the half-axle brake (17) is rotatably connected to the axle (18), and the two ends of the axle (18) are fixedly connected to the chassis longitudinal beam of the vehicle body shell (26).

7. The long-range new energy sightseeing vehicle based on a high-efficiency permanent magnet synchronous motor according to claim 6 is characterized in that: The wheel hub of the wheel assembly (14) and the output flange of the half-axle brake (17), as well as the mounting seat of the half-axle brake (17) and the mounting groove (15) are all threadedly connected and fixed by high-strength bolts (16).

8. The long-range new energy sightseeing vehicle based on a high-efficiency permanent magnet synchronous motor according to claim 1 is characterized in that: The front end and rear end outer surfaces of the vehicle body shell (26) are respectively fixedly connected with a front end anti-collision system (6) and a rear end anti-collision system (7).

9. The long-range new energy sightseeing vehicle based on a high-efficiency permanent magnet synchronous motor according to claim 6, characterized in that: The two ends of the axle (18) are fixedly connected to the chassis longitudinal beam of the vehicle body shell (26) through a flange structure. The flange is provided with a plurality of mounting holes and is fastened by high-strength bolts.

10. The long-range new energy sightseeing vehicle based on a high-efficiency permanent magnet synchronous motor according to claim 7, characterized in that: The hub of the wheel assembly (14) is made of forged aluminum alloy, and the tread is made of a rubber material with a low rolling resistance formula.

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