DESC:FIELD OF INVENTION
[0001] The present invention generally relates to a transmission system in a two wheeler vehicle, and more particularly, relates to a belt drive system which is responsible for transmitting power from the engine to the rear wheel of the vehicle.

BACKGROUND OF THE INVENTION
[0002] The transmission system of a two-wheeler vehicle is a complex mechanism responsible for transmitting the power generated by the engine to the rear wheel, allowing the vehicle to move. This transmission system is typically composed of several interconnected components, including the clutch, gearbox, drive shaft, and, in many instances, a belt or chain drive system. Each of these parts plays a crucial role in converting the raw power produced by the engine into usable kinetic energy that propels the vehicle forward.
[0003] Among these, the belt drive is a critical component. A belt drive system uses a belt, typically made from rubber or other similar materials, to transmit power between the engine and the rear wheel. The belt is placed over two pulleys, one attached to the engine's output shaft (the driver pulley) and the other attached to the input shaft of the gearbox or directly to the rear wheel (the driven pulley). When the engine runs, it turns the driver pulley, which in turn moves the belt, causing the driven pulley to rotate, and propelling the vehicle.
[0004] In such a system, maintaining an optimal tension in the belt is vital for efficient power transmission. If the tension is too low, the belt may slip on the pulleys, leading to inefficient power transmission, loss of speed, and increased wear on the belt. Conversely, if the tension is too high, it can cause unnecessary strain on the pulleys and the belt, leading to premature wear and potential failure of these components.
[0005] JP6331305B2 discloses a belt tension adjusting mechanism that includes a first pulley connected to an output shaft of an engine and an electric motor connected to an auxiliary machine of the engine and starting the engine. A second pulley provided on a member around a shaft of a motor generator having both a function and a function as a generator driven by the engine to generate electric power , wound around the first pulley and the second pulley. A belt that transmits power from the first pulley to the second pulley, a first tension pulley that is provided upstream of the second pulley in the running direction of the belt, and is in contact with the belt. A second tension pulley which is provided on the downstream side of the pulley in the running direction of the belt so as to face the first tension pulley and is in contact with the belt and the first tension. A first arm that supports the rotating shaft of the roller, a second arm that supports the rotating shaft of the second tension pulley, a coupling portion that couples the first arm and the second arm, and the coupling portion adjusting means for moving the first tension pulley and the second tension pulley by displacing the second pulley in a direction to move away from or approach the second pulley, thereby increasing or decreasing the tension of the belt; The actuator is configured to displace the coupling portion in accordance with the operating state of the engine and the operating state of the motor generator . That is, the first tension pulley and the second tension pulley press the belt.
[0006] US6834228B2 disclose a belt drive system for automatically controlling a belt tension. The system comprises an actuator controlled by a control module. The actuator operates on a pivoted pulley. A belt is trained about the pivoted pulley as well as other pulleys driving various accessories. A series of sensors in the system detect a belt condition including a belt tension. Sensor signals are transmitted to the control module. The control module processes the signals and instructs the actuator to move the pivoted pulley, thereby increasing or decreasing a belt tension. A feedback loop from the sensors to the control module allows the belt tension to be continuously monitored and adjusted many times per second. The system may actively control a belt tension by anticipating a system condition to prevent a belt noise by comparing sensor signals to instructions stored in a control module memory.
[0007] US6953407B2 discloses a belt transmission apparatus capable of changing a tension of a belt by the action of belt tension adjuster from a first optimal value of higher tension suitable for the starting of engine to a second optimal value of lower tension suitable for driving an accessory after engine has been started. The belt transmission apparatus includes a rotating electric machine pulley of a rotating electric machine for transmitting starting power to engine; engine pulley for transmitting starting power to engine and rotation power of engine to accessories; auxiliary pulleys rotated by the power from engine pulley to drive the accessories belt wrapped around rotating electric machine pulley, engine pulley and auxiliary pulleys and belt tension adjuster for urging belt to set tension in a plurality of stages.
[0008] Historically, tensioning systems for transmission belts in two-wheeled vehicles have been challenged by a variety of limitations. Traditional methods for adjusting belt tension often involve manual adjustments that require specific tools and technical knowledge. This can lead to a range of issues, including inconsistent tensioning, which may adversely affect vehicle performance, increase the risk of belt slippage or breakage, and contribute to premature wear of the transmission components.
[0009] One of the primary concerns with conventional tensioning solutions is their complexity and the inconvenience posed by the need for frequent adjustments. These systems often demand a significant amount of time and effort to maintain optimal tension, which can be particularly problematic for users without technical expertise or access to specialized maintenance services.
[0010] Additionally, many existing tensioning mechanisms are not fully integrated into the vehicle's structure, making them more susceptible to environmental damage and wear. External components can be exposed to road debris, moisture, and other elements that may accelerate wear and decrease the system's reliability over time. Furthermore, these non-integrated systems may require additional space, complicating the design and potentially impacting the aerodynamics and aesthetic appeal of the vehicle.
[0011] The integration and reliability of tensioning systems thus represent significant challenges in the design and maintenance of two-wheeled vehicles. There is a clear need for innovations that can simplify the tensioning process, enhance durability, and improve the overall user experience by addressing the limitations of conventional systems.
[0012] While a number of prior art documents disclose various mechanism and systems to adjust belt tension in a transmission system for vehicle, none of the prior art documents address the need to achieve a simple, cost-effective system and process to adjust the belt tension. Moreover, none of the conventional systems disclose a belt tension system or mechanism allows for manual adjustment of belt tension, providing a straightforward means to maintain optimal belt tension.

SUMMARY OF THE INVENTION
[0013] In light of the disadvantages mentioned in the previous section, the following summary is provided to facilitate an understanding of some of the innovative features unique to the present invention and is not intended to be a full description. A full appreciation of the various aspects of the invention can be gained by taking the entire specification and drawings as a whole.
[0014] The present invention relates to a novel tensioning system specifically designed for two-wheeled vehicles. This system is engineered to provide an efficient and reliable method for adjusting the tension of a transmission belt, which is critical for the optimal performance of the vehicle.
[0015] The core of the invention lies in a tensioning assembly that is strategically housed within the swing arm structure of the vehicle. This assembly is composed of a tensioning block, a tensioning bolt, and a lock nut. The motor, integral to the vehicle's propulsion, is mounted on a motor mounting plate and features a shaft that extends outward to connect to a driver pulley. This driver pulley is in turn engaged with a driven pulley via a transmission belt, forming a critical component of the vehicle's transmission system.
[0016] The innovative aspect of the tensioning system is its ability to adjust the tension of the transmission belt through longitudinal movement of the motor, the motor mounting plate, and the driver pulley. This adjustment is achieved by manipulating the tensioning bolt. Once the desired tension is reached, the tensioning block and lock nut work in conjunction to secure the tensioning bolt in place, thereby maintaining the transmission belt at the desired tension.
[0017] Further enhancing the invention's utility, the swing arm structure incorporates an aperture through which the lug portion of the motor mounting plate extends. This design facilitates the adjustment of the transmission belt's tension by allowing for the longitudinal movement of the lug portion of the motor mounting plate in response to the tightening or loosening of the tensioning bolt. The aperture and other slots within the swing arm structure are of a horizontally elliptical configuration, permitting the necessary longitudinal movement for tension adjustment.
[0018] The invention also outlines a method for adjusting the tension of the transmission belt in a two-wheeled vehicle. This method involves manipulating the tensioning bolt within the tensioning assembly to achieve the desired belt tension, and then securing this adjustment with the tensioning block and lock nut. This process allows for the longitudinal movement of the motor, motor mounting plate, and driver pulley, thereby enabling precise adjustment of the belt's tension.
[0019] In summary, the present invention introduces a tensioning system for two-wheeled vehicles that offers a simple yet effective solution for adjusting and maintaining the tension of the transmission belt. This system not only improves the performance and reliability of the vehicle but also simplifies maintenance procedures related to the transmission belt's tension.
[0020] This summary is provided merely for purposes of summarizing some example embodiments, so as to provide a basic understanding of some aspects of the subject matter described herein. Accordingly, it will be appreciated that the above-described features are merely examples and should not be construed to narrow the scope or spirit of the subject matter described herein in any way.

BRIEF DESCRIPTION OF THE DRAWING
[0021] Figure 1 illustrates the exterior structure 100 of a transmission system incorporated with the proposed belt tensioning system according to the embodiments of the present disclosure.
[0022] Figure 2 illustrates the interior structure 200 of a transmission system incorporated with the proposed belt tensioning system according to the embodiments of the present disclosure.
[0023] Figure 3 is a front view 300 of the proposed belt tensioning system incorporated in a two-wheeled vehicle according to the embodiments of the present disclosure.
[0024] Figure 4 is a close-up view 400 of the belt tensioning system disclosed in figure 3 according to the embodiments of the present disclosure.
[0025] Figure 5 is front view 500 of the proposed belt tensioning system incorporated in a two-wheeled vehicle without the pulleys and the transmission belt according to the embodiments of the present disclosure.
[0026] Figure 6 is a close-up view 600 of the belt tensioning system disclosed in figure 5 according to the embodiments of the present disclosure.
[0027] Figure 7 is an illustration of the swing arm structure 700 of the proposed invention according to the embodiments of the present disclosure.
[0028] Figure 8 is an illustration 800 of the motor mounted on a motor mounting plate of the proposed invention according to the embodiments of the present disclosure.
[0029] Figure 9 is an illustration 900 of the motor mounting plate of the proposed invention according to the embodiments of the present disclosure.

DETAILED DESCRIPTION OF THE DRAWINGS
[0030] For the purpose of promoting an understanding of the principles of the disclosure, reference will now be made to the embodiment illustrated in the figures and specific language will be used to describe them. It will nevertheless be understood that no limitation of the scope of the disclosure is thereby intended. Such alterations and further modifications in the illustrated system, and such further applications of the principles of the disclosure as would normally occur to those skilled in the art are to be construed as being within the scope of the present disclosure.
[0031] The terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process or method that comprises a list of steps does not include only those steps but may include other steps not expressly listed or inherent to such a process or method. Similarly, one or more devices or sub-systems or elements or structures or components preceded by "comprises... a" does not, without more constraints, preclude the existence of other devices, sub-systems, elements, structures, components, additional devices, additional sub-systems, additional elements, additional structures, or additional components. Appearances of the phrase "in an embodiment", "in another embodiment" and similar language throughout this specification may, but not necessarily do, all refer to the same embodiment.
[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this disclosure belongs. The system, methods, and examples provided herein are only illustrative and not intended to be limiting.
[0033] Embodiments of the present invention presents a novel belt tensioning system specifically designed for two-wheeled vehicles, addressing the longstanding issue of maintaining optimal tension within the transmission belt, a critical component for the efficient transmission of power from the engine to the rear wheel. This system, ingeniously integrated within the vehicle's swing arm structure, offers a simplified, yet effective approach to adjust and secure the belt's tension, thereby enhancing the vehicle's performance and reliability. The incorporation of a motor mounted on a plate, connected to driver and driven pulleys through the belt, forms the basis of this innovative system.
[0034] The system's core innovation lies in its tensioning assembly, comprising elements that facilitate easy adjustment of the belt's tension through longitudinal movement of the motor and pulleys. This approach not only simplifies the adjustment process but also ensures that the belt operates within its optimal tension range, reducing the risk of slippage or wear and extending the lifespan of both the belt and the transmission system. The design accommodates for easy maintenance, aiming to provide a user-friendly solution that doesn't require specialized tools or knowledge, addressing a common challenge faced by vehicle owners and technicians alike.
[0035] Furthermore, the invention outlines a method for adjusting the transmission belt's tension, emphasizing the ease and precision with which adjustments can be made. By securing the adjustment with a lock and nut, the system maintains the desired tension, thereby ensuring consistent and reliable performance. This method, coupled with the system's integrated design, represents a significant advancement in the field of two-wheeled vehicle transmission systems, promising to set a new standard for efficiency, reliability, and ease of maintenance in the industry.
[0036] Referring to the figures, figure 1 showcases the exterior structure of the two-wheeler's transmission system, highlighting the overall integration of the belt tensioning system. This figure sets the stage for understanding the system's external placement and its relationship with the vehicle's architecture, providing a general overview of where and how the belt tensioning components fit within the vehicle's design. Figure 2 delves into the interior workings of the transmission system, offering a closer look at how the belt tensioning system's components are arranged inside the vehicle. This detailed view is crucial for comprehending the mechanical interplay between the tensioning assembly and other parts of the transmission system, illustrating the system's internal configuration and the precision engineering involved in its design.
[0037] Figure 3 provides a frontal perspective of the belt tensioning system, emphasizing the spatial arrangement of its main components within the context of the two-wheeled vehicle. This view is instrumental in visualizing how the tensioning system is positioned relative to other key elements of the vehicle, highlighting its accessibility and integration. The driver pulley (302), driven pulley (304), and the transmission belt (306) are visualized in this illustration. The circled portion marked as A is disclosed in more detail in figure 4. Figure 4 offers a zoomed-in view of the tensioning assembly, focusing on the specific parts like the tensioning block, bolt, and nut. This close-up is essential for understanding the tension adjustment mechanism in detail, showcasing the design features that allow for precise tension control and maintenance. The lug portion (402) of the motor mounting plate extends outwards through an aperture provided in the swing arm structure. The tensioning assembly includes a tensioning block (410) secured by a pair of belt tensioning blocks (404). A tensioning bolt (406) interfaced with the lug portion (402) of the motor mounting plate. When the tensioning bolt (406) is tightened/loosened, the motor mounted on the motor mounting plate moves longitudinally thereby enabling adjustment of tension. The tensioning block (410) secures the tensioning bolt (406) in position in conjunction with the lock nut (408).
[0038] Figure 5 presents the belt tensioning system without the pulleys and belt, offering a clear view of the tensioning assembly's mounting within the swing arm. This simplification helps to isolate and emphasize the tensioning mechanism's components, providing insight into the system's foundational structure. The circled portion marked as B is disclosed in more detail in figure 6. Figure 6 further zooms in on the tensioning assembly in the absence of the belt and pulleys, with a focus on the details of the tensioning mechanism itself. This view is critical for appreciating the fine details of the tensioning assembly, illustrating the simplicity and effectiveness of the design. The swing arm structure comprises apertures and slots for accommodating various components. Each of these slots are placed strategically to support the functionality of the present invention. The lug portion (402) of the motor mounting plate extends outwards from the swing arm structure via aperture an (602). This allows the lug portion (402) to interface with the tensioning bolt (406) seamlessly allowing adjustment of belt tension. The shaft slot (602) allows the motor shaft to extend outwards through the swing arm structure. Furthermore, bolt slots (606A, 606B, and 606C) allow mounting the swing arm structure to the motor mounting plate using a set of bolts. It may be noted that the aperture (602), the shaft slot (604), and the bolt slots (606A, 606B, and 606C) have a horizontally elliptical configuration. This design choice was made specifically to allow the primary components secured using these slots (the motor, the motor mounting plate, and the driver pulley) to move longitudinally for the purpose of tightening or loosening the transmission belt (306). The motor housing is also provided with additional space on either sides to allow limited longitudinal movement.
[0039] Figure 7 illustrates the swing arm structure (700) LH, detailing its role in housing and supporting the tensioning system. This figure underlines the importance of the swing arm in the overall design, showing how it accommodates the tensioning assembly and contributes to the system's functionality.
[0040] Figure 8 depicts the motor (800) mounted on the motor mounting plate (802), highlighting the connection between the motor, the mounting plate, the motor shaft (806) and the transmission system. This illustration clarifies the role of the motor and mounting plate in driving the belt tensioning mechanism, emphasizing their integral function within the system. The motor mounting plate is mounted to the motor using motor mounting plate bolts (808). Figure 9 focuses on the motor mounting plate (804) alone, showcasing its design and features that facilitate the effective operation of the tensioning system. This figure provides a closer examination of one of the key support structures within the tensioning system, detailing its contribution to the system's overall effectiveness. The lug portion (402) of the motor mounting plate can be seen clearly in this figure.
[0041] Each figure plays a crucial role in depicting various aspects of the belt tensioning system, from general integration within the vehicle to specific details of the tensioning mechanism, offering a comprehensive visual representation of the invention's innovative design and functionality.
[0042] The present invention introduces a comprehensive belt tensioning system designed for the enhanced performance and reliability of two-wheeled vehicles, addressing the critical aspect of maintaining optimal tension within the transmission belt (306) for efficient power transmission. Central to this invention is a meticulously designed tensioning assembly, integrated within the swing arm structure (700), comprising a tensioning block (410), a tensioning bolt (406), and a lock nut (408). The propulsion system's motor (802), securely mounted on a motor mounting plate (804), extends a shaft (806) that connects to a driver pulley (302). This pulley interacts with a driven pulley (304) through the transmission belt (306), forming the vehicle's transmission system's backbone.
[0043] The innovation of this system lies in its ability to facilitate the adjustment of the transmission belt's (306) tension via the longitudinal displacement of the motor (802), the motor mounting plate (804), and the driver pulley (302). This adjustment is effectuated through the manipulation of the tensioning bolt (406). Following the adjustment to achieve the desired tension, the tensioning block (410) and lock nut (408) are employed to securely maintain the tensioning bolt (406) in its adjusted position, thus preserving the set tension in the transmission belt (306).
[0044] Enhancing this system's utility, the swing arm structure (700) incorporates an aperture (602) designed to allow the lug portion (402) of the motor mounting plate to protrude, enabling easy access for tension adjustments. This arrangement allows the lug portion (402) of the motor mounting plate to move longitudinally in response to adjustments made to the tensioning bolt (406), facilitated by the aperture (602) and additional slots within the swing arm structure, designed with a horizontally elliptical configuration to accommodate necessary adjustments. To complement the mechanical components, the invention also specifies motor shaft slot (604) and bolt slots (606A, 606B, 606C), strategically placed to support the motor and motor mounting plate attachment, ensuring their alignment and stability during tension adjustments.
[0045] Various advantages of the transmission system and the process thereof includes, optimized power transmission, versatility of the system, cost-effectiveness and simplicity and compact design. By maintaining optimal tension between the driving and driven pulleys, the system ensures efficient power transmission. This results in improved vehicle performance across a broad range of speeds and loads. The system and method's adaptability allows it to be used in various types of vehicles, particularly two-wheeled ones like motorcycles and scooters. This versatility expands its applicability, potentially benefiting a wider range of vehicles. The system's simplicity means it doesn't rely on complex actuators or sensor systems, potentially leading to lower production and maintenance costs. It also simplifies the task of maintaining optimal belt tension, making it more user-friendly. The compact nature of the belt tensioning system allows it to be efficiently integrated into the vehicle's transmission system, making the most of the available space within the vehicle's powertrain. The system's ability to adapt to changes in belt tension due to wear, load changes, and other factors optimizes power delivery at various engine RPM levels. This adaptability enhances the overall efficiency and performance of the vehicle, extending the lifespan of the belt and related components, and reducing the need for frequent maintenance. Another advantage of this tensioning mechanism is this helps in achieving best alignment in driver and driven pulley every time you adjust the belt tension which in turn ensure excellent performance and durability of the Transmission system.
,CLAIMS:We Claim:

1. A tensioning system for a two-wheeled vehicle, comprising:
a motor mounted on a motor mounting plate, the motor having a shaft extending therefrom;
a driver pulley (302) connected to the motor shaft;
a driven pulley (306) engaged with the driver pulley (302) via a transmission belt (306);
a swing arm structure configured to house the driver pulley (302), the driven pulley (306), and the transmission belt (306); and
a tensioning assembly disposed within the swing arm structure, the tensioning assembly comprising a tensioning block (410), a tensioning bolt (406), and a lock nut (408), wherein the tensioning bolt (406) is adjustable to effectuate longitudinal movement of the motor, the motor mounting plate, and the driver pulley (302) to adjust the tension of the transmission belt (306);

2. The belt tensioning system of claim 1, wherein the tensioning block (410) and the lock nut (408) are configured to secure the tensioning bolt (406) at a desired adjustment, thereby maintaining a determined tension of the transmission belt (306).

3. The system of claim 1, wherein the swing arm structure comprises an aperture (602) through which a lug portion (402) of the motor mounting plate extends outwards from the swing arm structure.

4. The system of claim 3, wherein the tensioning bolt (406) interfaces with the lug portion (402) of the motor mounting plate facilitating adjustment of the transmission belt’s (306) tension in response to tightening or loosening the tensioning bolt (406).

5. The system of claim 4, wherein the aperture (602) provided in the swing arm structure is of a horizontally elliptical configuration permitting longitudinal movement of the lug portion (402) of the motor mounting plate during adjustment of the transmission belt’s (306) tension.

6. The system of claim 1, wherein a motor shaft slot (604) and bolt slots (606A,606B, 606C) are provided within the swing arm structure to facilitate mounting the motor and the motor mounting plate to the swing arm structure.

7. The system of claim 6, wherein the motor shaft slot (604) and bolt slots (606A, 606B, 606C) provided within the swing arm structure are of a horizontally elliptical configuration permitting longitudinal movement of the motor, motor mounting plate, and the motor shaft during adjustment of the transmission belt’s (306) tension.

8. A method for adjusting tension of a transmission belt (306) in a two-wheeled vehicle, the method comprising:
providing a motor mounted to a motor mounting plate, the motor includes a shaft connected to a driver pulley (302), which in turn is connected to a driven pulley (306) via the transmission belt (306), wherein the driver pulley, the driven pulley (306) and the transmission belt (306) are housed within a swing arm structure;
adjusting tension of said transmission belt (306) by manipulating a tensioning bolt (406) within a tensioning assembly housed within the swing arm structure, said tensioning assembly further comprising a tensioning block (410) and a lock nut (408); and
securing a desired tension of the transmission belt (306) by engaging the tensioning block (410) and the lock nut (408) to maintain the tensioning bolt (406) in a determined position.

9. The method of claim 9, wherein the motor, the motor mounting plate, and the driver pulley (302) moves longitudinally upon tightening or loosening the tensioning bolt (406) thereby adjusting the tension of the transmission belt (306).