Description:FIELD OF THE INVENTION

[1] The present disclosure generally relates to a saddle-type vehicle. More particularly, the present disclosure relates to the swing arm assembly of a saddle-type vehicle.

BACKGROUND

[2] In a saddle-type vehicle, for example an internal combustion engine (ICE) scooter, the frame structure will have a single main tube coupled to a steering handle through a headtube on one end. Typically, the single main tube extends towards a swing arm on the other end. The swing arm is a crucial part of the rear suspension system and a crucial contributor to the vehicle dynamics. The swing arm connects the rear wheel of the scooter to the frame and allows the wheel to move up and down, absorbing shocks and bumps from the road. The swing arm acts as a load transfer linkage between the rear wheel and the frame through a rear shock absorber.

[3] Existing single main tube frame structure provides lower storage volume, battery volume, and stiffness for shorter swing arm assemblies. A frame structure having fork configuration can increase the storage and battery capacity. However, such a frame structure would need a swing arm assembly with a novel mounting feature that can provide higher stiffness to the frame. Further, an adequate frame clearance needs to be considered so that the swing arm would fit perfectly into the frame structure. However, if the swing arm pivot bolt is torqued when the clearance between the frame and the swing arm is more than the required clearance, large amounts of stresses will be induced on the frame leading to failures. Moreover, if the frame is stiff, there will be a gap between the swing arm assembly and the frame structure.

SUMMARY

[4] This summary is provided to introduce a selection of concepts, in a simplified format, that is further described in the detailed description of the invention. This summary is neither intended to identify key or essential inventive concepts of the invention and nor is it intended for determining the scope of the invention.

[5] The main objective of the present disclosure is to provide a swing arm assembly that supports a frame structure having a fork configuration in a saddle-type vehicle.

[6] In an embodiment of the present disclosure, a saddle-type vehicle is disclosed. The saddle-type vehicle includes a frame structure. The frame structure includes a pair of main tubes. The pair of main tubes includes a rear portion (CC’- DD'). The frame structure includes a swing arm assembly. The swing arm assembly includes a pair of swing arm structures having a first sleeve and a second sleeve respectively. The pair of swing arm structures is coupled to the rear portion (CC’- DD') of the pair of main tubes respectively. The swing arm assembly includes a swing arm sub-assembly adjustably coupled to and between the pair of swing arm structures. The swing arm sub-assembly is operable to engage or disengage with the first sleeve and the second sleeve.

[7] In an embodiment of the present disclosure, a swing arm assembly for a saddle-type vehicle is disclosed. The swing arm assembly includes a pair of swing arm structures coupled to a frame structure of a saddle-type vehicle. The swing arm assembly includes a swing arm sub-assembly adjustably coupled to and between the pair of swing arm structures. The swing arm sub-assembly includes a housing tube. The housing tube includes a first internal threaded portion oriented along a first direction and a second internal threaded portion oriented along a second direction opposite to the first direction. The housing tube includes a first external threaded spacer and a second external threaded spacer movably coupled to each other through an adjuster nut, wherein the first external threaded spacer and the second external threaded spacer are operably engaged to the first internal threaded portion and the second internal threaded portion. The first external threaded spacer and the second external threaded spacer are oriented along the first direction and the second direction respectively. The swing arm sub-assembly is operable to engage or disengage with the swing arm structures.

[8] To further clarify the advantages and features of the present invention, a more particular description of the invention will be rendered by reference to specific embodiments thereof, which are illustrated in the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. The invention will be described and explained with additional specificity and detail with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[9] These and other features, aspects, and advantages of the present invention will become better understood when the following detailed description is read with reference to the accompanying drawings in which like characters represent like parts throughout the drawings, wherein:

[10] Figure 1 illustrates a perspective side view of a two-wheeler vehicle having, according to an embodiment of the present disclosure;

[11] Figure 2A illustrates a perspective view of a frame structure in a saddle-type vehicle, according to an embodiment of the present disclosure;

[12] Figure 2B illustrates a perspective view of the frame structure of the saddle-type vehicle, according to an embodiment of the present disclosure;

[13] Figure 2C illustrates a perspective view of swing arm structures in a swing arm assembly, according to an embodiment of the present disclosure;

[14] Figure 2D illustrates a housing tube in a swing arm sub-assembly, according to an embodiment of the present disclosure;

[15] Figure 2E illustrates the housing tube fixed on to the frame structure, according to an embodiment of the present disclosure; and

[16] Figure 2F illustrates a cutout in the housing tube, according to an embodiment of the present disclosure.

[17] Further, skilled artisans will appreciate that elements in the drawings are illustrated for simplicity and may not have necessarily been drawn to scale. For example, the flow charts illustrate the method in terms of the most prominent steps involved to help to improve understanding of aspects of the present invention. Furthermore, in terms of the construction of vehicle, one or more components of the vehicle may have been represented in the drawings by conventional symbols, and the drawings may show only those specific details that are pertinent to understanding the embodiments of the present invention so as not to obscure the drawings with details that will be readily apparent to those of ordinary skill in the art having the benefit of the description herein.

DETAILED DESCRIPTION OF FIGURES

[18] For the purpose of promoting an understanding of the principles of the present disclosure, reference will now be made to the various embodiments and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the present disclosure is thereby intended, such alterations and further modifications in the illustrated system, and such further applications of the principles of the present disclosure as illustrated therein being contemplated as would normally occur to one skilled in the art to which the present disclosure relates.

[19] It will be understood by those skilled in the art that the foregoing general description and the following detailed description are explanatory of the present disclosure and are not intended to be restrictive thereof.

[20] Whether or not a certain feature or element was limited to being used only once, it may still be referred to as “one or more features” or “one or more elements” or “at least one feature” or “at least one element.” Furthermore, the use of the terms “one or more” or “at least one” feature or element do not preclude there being none of that feature or element, unless otherwise specified by limiting language including, but not limited to, “there needs to be one or more…” or “one or more elements is required.”

[21] Reference is made herein to some “embodiments.” It should be understood that an embodiment is an example of a possible implementation of any features and/or elements of the present disclosure. Some embodiments have been described for the purpose of explaining one or more of the potential ways in which the specific features and/or elements of the proposed disclosure fulfil the requirements of uniqueness, utility, and non-obviousness.

[22] Use of the phrases and/or terms including, but not limited to, “a first embodiment,” “a further embodiment,” “an alternate embodiment,” “one embodiment,” “an embodiment,” “multiple embodiments,” “some embodiments,” “other embodiments,” “further embodiment”, “furthermore embodiment”, “additional embodiment” or other variants thereof do not necessarily refer to the same embodiments. Unless otherwise specified, one or more particular features and/or elements described in connection with one or more embodiments may be found in one embodiment, or may be found in more than one embodiment, or may be found in all embodiments, or may be found in no embodiments. Although one or more features and/or elements may be described herein in the context of only a single embodiment, or in the context of more than one embodiment, or in the context of all embodiments, the features and/or elements may instead be provided separately or in any appropriate combination or not at all. Conversely, any features and/or elements described in the context of separate embodiments may alternatively be realized as existing together in the context of a single embodiment.

[23] Any particular and all details set forth herein are used in the context of some embodiments and therefore should not necessarily be taken as limiting factors to the proposed disclosure.

[24] 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 process or method. Similarly, one or more devices or sub-systems or elements or structures or components proceeded by “comprises... a” does not, without more constraints, preclude the existence of other devices or other sub-systems or other elements or other structures or other components or additional devices or additional sub-systems or additional elements or additional structures or additional components.

[25] Embodiments of the present disclosure will be described below in detail with reference to the accompanying drawings.

[26] For the sake of clarity, the first digit of a reference numeral of each component of the present disclosure is indicative of the Figure number, in which the corresponding component is shown. For example, reference numerals starting with digit “1” are shown at least in Figure 1. Similarly, reference numerals starting with digit “2” are shown at least in Figure 2.

[27] An Electric Vehicle (EV) or a battery powered vehicle including, and not limited to two-wheelers such as scooters, mopeds, motorbikes/motorcycles; three-wheelers such as auto-rickshaws, four-wheelers such as cars and other Light Commercial Vehicles (LCVs) and Heavy Commercial Vehicles (HCVs) primarily work on the principle of driving an electric motor using the power from the batteries provided in the EV. Furthermore, the electric vehicle may have at least one wheel which is electrically powered to traverse such a vehicle. The term ‘wheel’ may be referred to any ground-engaging member which allows traversal of the electric vehicle over a path. The types of EVs include Battery Electric Vehicle (BEV), Hybrid Electric Vehicle (HEV) and Range Extended Electric Vehicle. However, the subsequent paragraphs pertain to the different elements of a Battery Electric Vehicle (BEV).

[28] In construction, as illustrated in Figure 1, an EV (10) typically comprises a battery or battery pack (12) enclosed within a battery casing and includes a Battery Management System (BMS), an on-board charger (14), a Motor Controller Unit (MCU), an electric motor (16) and an electric transmission system (18). The primary function of the above-mentioned elements is detailed in the subsequent paragraphs: The battery of an EV (10) (also known as Electric Vehicle Battery (EVB) or traction battery) is re-chargeable in nature and is the primary source of energy required for the operation of the EV, wherein the battery (12) is typically charged using the electric current taken from the grid through a charging infrastructure (20). The battery may be charged using Alternating Current (AC) or Direct Current (DC), wherein in case of AC input, the on-board charger (14) converts the AC signal to DC signal after which the DC signal is transmitted to the battery via the BMS. However, in case of DC charging, the on-board charger (14) is bypassed, and the current is transmitted directly to the battery via the BMS.

[29] The battery (12) is made up of a plurality of cells which are grouped into a plurality of modules in a manner in which the temperature difference between the cells does not exceed 5 degrees Celsius. The terms “battery”, “cell”, and “battery cell” may be used interchangeably and may refer to any of a variety of different rechargeable cell compositions and configurations including, but not limited to, lithium-ion (e.g., lithium iron phosphate, lithium cobalt oxide, other lithium metal oxides, etc.), lithium-ion polymer, nickel metal hydride, nickel cadmium, nickel hydrogen, nickel-zinc, silver zinc, or other battery type/configuration. The term “battery pack” as used herein may be referred to multiple individual batteries enclosed within a single structure or multi-piece structure. The individual batteries may be electrically interconnected to achieve a desired voltage and capacity for a desired application. The Battery Management System (BMS) is an electronic system whose primary function is to ensure that the battery (12) is operating safely and efficiently. The BMS continuously monitors different parameters of the battery such as temperature, voltage, current and so on, and communicates these parameters to the Electronic Control Unit (ECU) and the Motor Controller Unit (MCU) in the EV using a plurality of protocols including and not limited to Controller Area Network (CAN) bus protocol which facilitates the communication between the ECU/MCU and other peripheral elements of the EV (10) without the requirement of a host computer.

[30] The MCU primarily controls/regulates the operation of the electric motor based on the signal transmitted from the vehicle battery, wherein the primary functions of the MCU include starting of the electric motor (16), stopping the electric motor (16), controlling the speed of the electric motor (16), enabling the vehicle to move in the reverse direction and protect the electric motor (16) from premature wear and tear. The primary function of the electric motor (16) is to convert electrical energy into mechanical energy, wherein the converted mechanical energy is subsequently transferred to the transmission system of the EV to facilitate movement of the EV. Additionally, the electric motor (16) also acts as a generator during regenerative braking (i.e., kinetic energy generated during vehicle braking/deceleration is converted into potential energy and stored in the battery of the EV). The types of motors generally employed in EVs include, but are not limited to DC series motor, Brushless DC motor (also known as BLDC motors), Permanent Magnet Synchronous Motor (PMSM), Three Phase AC Induction Motors and Switched Reluctance Motors (SRM).

[31] The transmission system (18) of the EV (10) facilitates the transfer of the generated mechanical energy by the electric motor (16) to the wheels (22a,22b) of the EV. Generally, the transmission systems (18) used in EVs include single speed transmission system and multi-speed (i.e., two-speed) transmission system, wherein the single speed transmission system comprises a single gear pair whereby the EV is maintained at a constant speed. However, the multi-speed/two-speed transmission system comprises a compound planetary gear system with a double pinion planetary gear set and a single pinion planetary gear set thereby resulting in two different gear ratios which facilitates higher torque and vehicle speed.

[32] In one embodiment, all data pertaining to the EV (10) and/or charging infrastructure (20) are collected and processed using a remote server (known as cloud) (24), wherein the processed data is indicated to the rider/driver of the EV (10) through a display unit present in the dashboard (26) of the EV (10). In an embodiment, the display unit may be an interactive display unit. In another embodiment, the display unit may be a non-interactive display unit.

[33] Embodiments of the present disclosure are related to a swing arm assembly in a frame structure having a fork configuration of a saddle-type vehicle, for example, the electric vehicle (10). The saddle-type vehicle (10) includes a steering handle (30) mounted on a headtube.

[34] Figure 2A illustrates a perspective view of a frame structure in a saddle-type vehicle, according to an embodiment of the present disclosure. The saddle-type vehicle (10) includes a frame structure (200). The frame structure (200) includes a head tube (205) for mounting a steering handle (30). The frame structure (200) includes a pair of main tubes (210a, 210b) coupled to the head tube (205) and arranged in a fork configuration. The pair of main tubes (210a, 210b) can also be considered to be arranged in an inverted “V” configuration. The pair of main tubes (210a, 210b) is interchangeably referred to as main tube (210) in the present disclosure.

[35] Each main tube (210a, 210b) includes a front portion, a mid-horizontal portion, and a rear portion. In one embodiment, the main tubes (210a, 210b) include a front portion (AA’- BB’), a mid-horizontal portion (BB’- CC’), and a rear portion (CC’- DD') as illustrated in Figure 2B.

[36] The frame structure (200) includes a pair of side tubes (215a, 215b). Each side tube of the pair of side tubes (215a, 215b) includes a front end and a rear end coupled respectively to the front portion (AA’- BB’) and the rear portion (BB’- CC’) of the corresponding main tube (210a, 210b). The frame structure (200) includes a pair of rear tubes (220a, 220b) coupled to the pair of main tubes (210a, 210b) respectively. The head tube (205), the pair of main tubes (210a, 210b), the pair of side tubes (215a, 215b), and the pair of rear tubes (220a, 220b) extend along a longitudinal direction of the saddle-type vehicle (10). One way to consider the frame structure (200) is as a main tube (210) joined to a rear tube (220) and a side tube (215) attached to the main tube (210). Further, three parts or portions, the front portion (AA’- BB’), the mid-horizontal portion (BB’- CC’), and the rear portion (BB’- CC’) can be joined to form the main tube (210).

[37] The frame structure (200) includes a swing arm assembly (230). Figure 2C illustrates a perspective view of swing arm structures in a swing arm assembly (230), according to an embodiment of the present disclosure. The swing arm assembly (230) includes a pair of swing arm structures (235a, 235b) connected to each other through a pivot cross tube (240). The swing arm structures (235a, 235b) have a first sleeve (245a) and a second sleeve (245b) respectively. The swing arm structures (235a, 235b) can also be referred to as swing arm pivot gussets. The pair of swing arm structures (235a, 235b) is coupled to the rear portions (BB’- CC’) of the pair of main tubes (210a, 210b) respectively as shown in Figure 2C. A swing arm sub-assembly (250) is adjustably coupled to and between the pair of swing arm structures (235a, 235b). Further, the swing arm sub-assembly (250) is operable to engage or disengage with the first sleeve (245a) and the second sleeve (245b).

[38] In an embodiment, the pair of swing arm structures (235a, 235b) is part of the frame structure (200) and not the swing arm assembly (230). In the instant embodiment, the swing arm assembly (230) only comprises the swing arm sub-assembly (250).

[39] The pair of swing arm structures or pivot gussets (235a, 235b) have a substantially U-shaped cross section and partially encloses the respective rear portions (BB’- CC’) of the pair of main tubes (210a, 210b). The swing arm assembly (230) is formed with sheet metal components which are welded together to form an assembly having a plurality of parts. The assembly having the parts is then welded on the respective rear portions (BB’- CC’) of the pair of main tubes (210a, 210b).

[40] The swing arm sub-assembly (250) includes a housing tube (255). Figure 2D illustrates the housing tube (255) in the swing arm sub-assembly (250). The housing tube (255) includes a first internal threaded portion (260a) oriented along a first direction and a second internal threaded portion (260b) oriented along a second direction opposite to the first direction.

[41] The swing arm sub-assembly (250) includes a first external threaded spacer (270a) and a second external threaded spacer (270b) movably coupled to each other through an adjuster nut (265). The first external threaded spacer (270a) is a spacer with LH external threads (260a) which will be adjusted towards the outside when the adjuster nut (265) is rotated in clockwise direction. The second external threaded spacer (270b) is a spacer with RH external threads (260b) which will be adjusted towards the outside when the adjuster nut (265) is rotated in the clockwise direction.

[42] Alternatively, the first external threaded spacer (270a) is a spacer with RH external threads (260a) which will be adjusted towards the outside when the adjuster nut (265) is rotated in anti-clockwise direction. The second external threaded spacer (270b) is a spacer with LH external threads (260b) which will be adjusted towards the outside when the adjuster nut (265) is rotated in the clockwise direction.

[43] Accordingly, the first external threaded spacer (270a) and the second external threaded spacer (270b) are operably engaged to the first internal threaded portion (260a) and the second internal threaded portion (260b). Further, the first external threaded spacer (270a) and the second external threaded spacer (270b) are oriented along the first direction and the second direction respectively, wherein the first direction and the second direction denote the direction of the threads.

[44] The swing arm sub-assembly (250) includes a first bush (280a) and a second bush (280b) coupled respectively to the first external threaded spacer (270a) and the second external threaded spacer (270b). The swing arm bushes (280a, 280b) are the joining interface between the frame structure (200) and the swing arm assembly (230). Further, the swing arm bush (280a, 280b) width is such that it is lower than the minimum face to face distance of the frame mounts. This will ensure the free assembly of the swing arm sub-assembly (250) to the frame structure (200).

[45] It is to be noted that the first external threaded spacer (270a), the second external threaded spacer (270b), the adjuster nut (265), and the first and second bushes (280a, 280b) are disposed within the housing tube (255). Also, the first internal threaded portion (260a) and the second internal threaded portion (260b) are disposed in the housing tube (255).

[46] The adjuster nut (265) is rotatable along a first rotatable direction to move the first external threaded spacer (270a) and the second external threaded spacer (270b) away from each other to engage the first bush (280a) and the second bush (280b) with the frame structure (200). The adjuster nut (265) is rotatable along a second rotatable direction to move the first external threaded spacer (270a) and the second external threaded spacer (270b) toward each other to disengage the first bush (280a) and the second bush (280b) from the frame structure (200). It is to be noted that the first rotatable direction and the second rotatable direction are opposite to each other. The housing tube (255) defines a cutout (285) to access the adjuster nut (265) for engaging or disengaging with the first sleeve (245a) and the second sleeve (245b). The cutout (285) is illustrated in Figure 2F.

[47] The swing arm assembly (230) provides higher stiffness to the frame structure (200). Further, since the axial stiffness of the bushes (280a, 280b) is low, the gaps will be closed by rotating the adjustable nut (265) and the swing arm sub-assembly (250) would fit perfectly into the frame structure (200).

[48] Furthermore, embodiments of the disclosed devices and systems may be readily implemented, fully or partially, in software using, for example, object or object-oriented software development environments that provide portable source code that can be used on a variety of computer platforms. Alternatively, embodiments of the disclosed methods, processes, modules, devices, systems, and computer program product can be implemented partially or fully in hardware using, for example, standard logic circuits or a very-large-scale integration (VLSI) design. Other hardware or software can be used to implement embodiments depending on the speed and/or efficiency requirements of the systems, the particular function, and/or particular software or hardware system, microprocessor, or microcomputer being utilized.

[49] In this application, unless specifically stated otherwise, the use of the singular includes the plural and the use of “or” means “and/or.” Furthermore, use of the terms “including” or “having” is not limiting. Any range described herein will be understood to include the endpoints and all values between the endpoints. Features of the disclosed embodiments may be combined, rearranged, omitted, etc., within the scope of the invention to produce additional embodiments. Furthermore, certain features may sometimes be used to advantage without a corresponding use of other features.

[50] List of reference numerals:
Components Reference numerals
Frame structure 200
Head tube 205
Main tubes 210a, 210b
Side tubes 215a, 215b
Rear tubes 220a, 220b
Swing arm assembly 230
Swing arm sub-assembly 250
Swing arm structures (pivot gussets) 235a, 235b
Pivot cross tube 240
First sleeve 245a
Second sleeve 245b
Housing tube 255
First internal threaded portion 260a
Second internal threaded portion 260b
First external threaded spacer 270a
Second external threaded spacer 270b
Adjuster nut 265
First bush 280a
Second bush 280b
Main tube 210
Side tube 215
Rear tube 220
Cutout 285
Front portion AA’- BB’
Mid-horizontal portion BB’- CC’
Rear portion CC’- DD'

, Claims:1. A saddle-type vehicle (10) comprising:
a frame structure (200) comprising:
a pair of main tubes (210a, 210b) comprising a rear portion (CC’- DD'); and
a swing arm assembly (230) comprising:
a pair of swing arm structures (235a, 235b) having a first sleeve (245a) and a second sleeve (245b) respectively, wherein the pair of swing arm structures (235a, 235b) is coupled to the rear portion (CC’- DD') of the pair of main tubes (210a, 210b) respectively; and
a swing arm sub-assembly (250) adjustably coupled to and between the pair of swing arm structures (235a, 235b), wherein the swing arm sub-assembly (250) is operable to engage or disengage with the first sleeve (245a) and the second sleeve (245b).

2. The saddle-type vehicle (10) as claimed in claim 1, wherein the swing arm sub-assembly (250) comprises a housing tube (255), wherein the housing tube (255) comprises a first internal threaded portion (260a) oriented along a first direction and a second internal threaded portion (260b) oriented along a second direction opposite to the first direction.

3. The saddle-type vehicle (10) as claimed in claim 2, wherein the swing arm sub-assembly (250) comprises:
a first external threaded spacer (270a) and a second external threaded
spacer (270b) movably coupled to each other through an adjuster nut (265), wherein the first external threaded spacer (270a) and the second external threaded spacer (270b) are operably engaged to the first internal threaded portion (260a) and the second internal threaded portion (260b), wherein the first external threaded spacer (270a) and the second external threaded spacer (270b) are oriented along the first direction and the second direction respectively; and
a first bush (280a) and a second bush (280b) coupled respectively to the first external threaded spacer (270a) and the second external threaded spacer (270b) respectively.

4. The saddle-type vehicle (10) as claimed in claim 3, wherein the first external threaded spacer (270a), the second external threaded spacer (270b), the adjuster nut (265), and the first and second bushes (280a, 280b) are disposed within the housing tube (255).

5. The saddle-type vehicle (10) as claimed in claim 3, wherein the adjuster nut (265) is rotatable along a first rotatable direction to move the first external threaded spacer(270a) and the second external threaded spacer (270b) away from each other to engage the first bush (280a) and the second bush (280b) with the frame structure (200).

6. The saddle-type vehicle (10) as claimed in claim 5, wherein the adjuster nut (265) is rotatable along a second rotatable direction to move the first external threaded spacer (270a) and the second external threaded spacer (270b) toward each other to disengage the first bush (280a) and the second bush (280b) from the frame structure (200), wherein the first rotatable direction and the second rotatable direction are opposite to each other.

7. The saddle-type vehicle (10) as claimed in claim 3, wherein the housing tube (255) defines a cutout (285) to access the adjuster nut (265) for engaging or disengaging with the first sleeve (245a) and the second sleeve (245b).

8. The saddle-type vehicle (10) as claimed in claim 1, wherein the frame structure (200) comprises:
a head tube (205) for mounting a steering handle (30), wherein the pair of main tubes (210a, 210b) is coupled to the head tube (205) and arranged in a fork configuration, wherein each main tube (210a, 210b) comprises a front portion (AA’- BB’), a mid-horizontal portion (BB’- CC’), and the rear portion (CC’- DD');
a pair of side tubes (215a, 215b), wherein each side tube (215a, 215b) comprises a front end and a rear end coupled respectively to the front portion (AA’- BB’) and the rear portion (CC’- DD') of the corresponding main tube (210a, 210b); and
a pair of rear tubes (220a, 220b) coupled to the pair of main tubes (210a, 210b) respectively, wherein the head tube (205), the pair of main tubes (210a, 210b), the pair of side tubes (215a, 215b), and the pair of rear tubes (220a, 220b) extend along a longitudinal direction of the saddle-type vehicle (10).

9. The saddle-type vehicle (10) as claimed in claim 1, wherein the swing arm assembly (230) comprises a pivot cross tube (240) configured to connect the pair of swing arm structures (235a, 235b) to each other.

10. A swing arm assembly (230) for a saddle-type vehicle (10), the swing arm assembly (230) comprising:
a pair of swing arm structures (235a, 235b) coupled to a frame
structure (200) of the saddle-type vehicle (10); and
a swing arm sub-assembly (250) adjustably coupled to and between
the pair of swing arm structures (235a, 235b), the swing arm sub-assembly (250) comprising:
a housing tube (255), wherein the housing tube (255) comprises a first internal threaded portion (260a) oriented along a first direction and a second internal threaded portion (260b) oriented along a second direction opposite to the first direction; and
a first external threaded spacer (270a) and a second external threaded spacer (270b) movably coupled to each other through an adjuster nut (265), wherein the first external threaded spacer (270a) and the second external threaded spacer (270b) are operably engaged to the first internal threaded portion (260a) and the second internal threaded portion (260b), wherein the first external threaded spacer (270a) and the second external threaded spacer (270b) are oriented along the first direction and the second direction respectively, wherein the swing arm sub-assembly (250) is operable to engage or disengage with the swing arm structures (235a, 235b).

11. The swing arm assembly (230) as claimed in claim 10, comprising a first bush (280a) and a second bush (280b) coupled respectively to the first external threaded spacer (270a) and the second external threaded spacer (270b), wherein the first external threaded spacer (270a), the second external threaded spacer (270b), the adjuster nut (265), and the first and second bushes (280a, 280b) are disposed within the housing tube (255).

12. The swing arm assembly (230) as claimed in claim 10, wherein,
the adjuster nut (265) is rotatable along a first rotatable direction to move the first external threaded spacer (270a) and the second external threaded spacer (270b) away from each other to engage the first bush (280a) and the second bush (280b) with the frame structure (200); and
the adjuster nut (265) is rotatable along a second rotatable direction to move the first external threaded spacer (270a) and the second external threaded spacer (270b) toward each other to disengage the first bush (280a) and the second bush (280b) from the frame structure (200), wherein the first rotatable direction and the second rotatable direction are opposite to each other.

13. The swing arm assembly (230) as claimed in claim 10, wherein the housing tube (255) defines a cutout (285) to access the adjuster nut (265) for engaging or disengaging the swing arm sub-assembly (250) with the swing arm structures (235a, 235b).

14. The swing arm assembly (230) as claimed in claim 10, wherein the pair of swing arm structures (235a, 235b) are connected to each other through a pivot cross tube (240).

15. The swing arm assembly (230) as claimed in claim 10, wherein the pair of swing arm structures (235a, 235b) comprises a first sleeve (245a) and a second sleeve (245b) respectively, wherein the swing arm sub-assembly (250) is operable to engage or disengage with the swing arm structures (235a, 235b) through the first sleeve (245a) the second sleeve (245b) respectively.