Claims:1. A spring seat assembly (50) for a suspension system (100) of a vehicle, the suspension system (100) including a twist beam (90) and a coil spring (10) mounted between the twist beam (90) and a body of the vehicle, the spring seat assembly (50) comprising:
a first seat portion (20) fixedly coupled to the twist beam (90) and configured to move along with the twist beam (90);
a second seat portion (30) movably coupled to the first seat portion (20) and defining a cavity (26) therebetween, the second seat portion (30) being configured to support the coil spring (10); and
an elastomer (40) disposed in the cavity (26) formed between the first seat portion (20) and the second seat portion (30),
wherein the elastomer (40) is structured to allow a movement of the first seat portion (20) with respect to the second seat portion (30).

2. The spring seat assembly (50) as claimed in claim 1, wherein the elastomer (40) is structured to allow the movement of the first seat portion (20) with respect to the second seat portion (30) between a first position and a second position of the first seat portion (20),
wherein the first position corresponds to a position of the first seat portion (20) in which the coil spring (10) is in a compressed state and the second position corresponds to a position of the first seat portion (20) in which the coil spring (10) is in an extended state.

3. The spring seat assembly (50) as claimed in claim 1, wherein the second seat portion (30) is pivotably coupled to the first seat portion (20) and the elastomer (40) is structured to allow a pivotal movement of the first seat portion (20) with respect to the second seat portion (30).

4. The spring seat assembly (50) as claimed in claim 1, wherein the first seat portion (20) is formed of a dome-shaped structure having a flat surface (24) fixedly coupled to the twist beam (90) and the second seat portion (30) is formed of a hemispherical shell having a concave portion (32) mounted on the dome-shaped structure of the first seat portion (20).
5. The spring seat assembly (50) as claimed in claim 4, wherein the hemispherical shell of the second seat portion includes a contour defined at an external surface thereof, the contour being configured to support the coil spring (10) between the twist beam (90) and the body of the vehicle.

6. The spring seat assembly (50) as claimed in claim 4, wherein the second seat portion (30) includes a flange (36) formed at a circumference of the hemispherical shell, the flange (36) being adapted to limit the movement of the first seat portion (20) with respect to the second seat portion (30).

7. The spring seat assembly (50) as claimed in claim 3, wherein the second seat portion (30) is pivotably coupled to the first seat portion (20) using a fastener (97).

8. The spring seat assembly (50) as claimed in claim 1, wherein the elastomers (40) include polymers.

9. A suspension system (100) of a vehicle, the suspension system (100) comprising:
a twist beam (90) and a coil spring (10) mounted between the twist beam (90) and a body of the vehicle; and
a spring seat assembly (50) adapted to be coupled to the twist beam (90), the spring seat assembly (50) including
a first seat portion (20) fixedly coupled to the twist beam (90) and configured to move along with the twist beam (90);
a second seat portion (30) movably coupled to the first seat portion (20) and defining a cavity (26) therebetween, the second seat portion (30) being configured to support the coil spring (10); and
an elastomer (40) disposed in the cavity (26) formed between the first seat portion (20) and the second seat portion (30),
wherein the elastomer (40) is structured to allow a movement of the first seat portion (20) with respect to the second seat portion (30).

10. The suspension system (100) as claimed in claim 9, wherein the elastomer (40) is structured to allow the movement of the first seat portion (20) with respect to the second seat portion (30) between a first position and a second position of the first seat portion (20),
wherein the first position corresponds to a position of the first seat portion (20) in which the coil spring (10) is in a compressed state and the second position corresponds to a position of the first seat portion (20) in which the coil spring (10) is in an extended state.

11. The suspension system (100) as claimed in claim 9, wherein the second seat portion (30) is pivotably coupled to the first seat portion (20) and the elastomer (40) is structured to allow a pivotal movement of the first seat portion (20) with respect to the second seat portion (30).

12. The suspension system (100) as claimed in claim 9, wherein the first seat portion (20) is formed of a dome-shaped structure having a flat surface (24) fixedly coupled to the twist beam (90) and the second seat portion (30) is formed of a hemispherical shell having a concave portion (32) mounted on the dome-shaped structure of the first seat portion (20).

13. The suspension system (100) as claimed in claim 9, wherein the second seat portion (30) is pivotably coupled to the first seat portion (20) using a fastener (97).

14. A vehicle, comprising:
a suspension system (100), including
a twist beam (90) and a coil spring (10) mounted between the twist beam (90) and a body of the vehicle; and
a spring seat assembly (50) adapted to be coupled to the twist beam (90), the spring seat assembly (50) including
a first seat portion (20) fixedly coupled to the twist beam (90) and configured to move along with the twist beam (90);
a second seat portion (30) movably coupled to the first seat portion (20) and defining a cavity (26) therebetween, the second seat portion (30) being configured to support the coil spring (10); and
an elastomer (40) disposed in the cavity (26) formed between the first seat portion (20) and the second seat portion (30),
wherein the elastomer (40) is structured to allow a movement of the first seat portion (20) with respect to the second seat portion (30).
, Description:TECHNICAL FIELD
[001] The present disclosure relates to the field of automobiles. Particularly, but not exclusively, the present disclosure relates to a spring seat assembly mounted on a suspension arm or twist beam to support a coil spring of a vehicle suspension.

BACKGROUND
[002] The information in this section merely provides background information related to the present disclosure and may not constitute prior art(s) for the present disclosure.
[003] Conventionally known suspension assembly of a vehicle, for example an articulated vehicle, includes a pivotable suspension arm or twist beam and is provided with a coil spring and a shock absorber mounted at separate positions to the suspension arm. The coil spring is typically formed of an upper spring portion adapted to contact a body of the vehicle and a lower spring portion adapted to be seated on the suspension arm of the suspension assembly. For seating the lower spring portion, a spring seat is interposed between a spring mounting portion of the suspension arm and the coil spring and said spring seat is fixedly mounted on the suspension arm. It can accordingly be contemplated that any disturbance or jerk, due to bump or rebound of the suspension arm or the twist beam, being induced in the suspension arm is transferred to the coil spring, thereby compressing, or extending the coil spring between the spring seat and the body of the vehicle.
[004] For the reason that the spring seat is fixedly mounted on the suspension arm, during any jerk or disturbance, the spring seat follows the curved trajectory of the pivoting suspension assembly, causing the coil spring to bend, in addition to being compressed or extended. This bending of the coil spring leads to uneven distribution of load in the coil spring, which results in an increase of high frequency vibrations, stress concentration and weight in the coil spring, thereby affecting the durability of the coil spring. Said conventional suspension assembly often requires additional means to enhance and stabilize operations of the coil spring, thereby increasing manufacturing and maintenance costs of the suspension arm and/or the coil spring.
[005] In addition, for the coil springs having high length to diameter ratio, there arises an issue of spring buckling, i.e., deformation of the coil spring and decrease in the effective length of the coil spring under the effect of an axial load. To counter said issue, it is required to employ a coil spring with low length to diameter ratio, which leads to the performance of the suspension assembly being compromised.
[006] Therefore, there remains a need for an improved spring seat assembly for suspension assembly of a vehicle and that is adapted to overcome the problems identified above. Specifically, there remains a need for a spring seat assembly that is capable of reducing stress concentration and weight in the coil spring, reducing high frequency vibrations in the coil spring, employing coil springs with high length to diameter ratio, and reducing the cost of manufacturing and maintenance of the suspension assembly.

SUMMARY
[007] The one or more shortcomings of the prior art are overcome by an assembly as claimed and additional advantages are provided through the provision of assembly as claimed in the present disclosure. Additional features and advantages are realized through the techniques of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered a part of the claimed disclosure.
[008] In an aspect, the present disclosure relates to a spring seat assembly for a suspension system of a vehicle, the suspension system including a twist beam and a coil spring mounted between the twist beam and a body of the vehicle. The spring seat assembly comprises a first seat portion fixedly coupled to the twist beam and configured to move along with the twist beam. The spring seat assembly further comprises a second seat portion movably coupled to the first seat portion and defines a cavity therebetween, and the second seat portion is being configured to support the coil spring. The spring seat portion furthermore comprises an elastomer disposed in the cavity formed between the first seat portion and the second seat portion, wherein the elastomer is structured to allow a movement of the first seat portion with respect to the second seat portion.
[009] In an embodiment, the elastomer is structured to allow the movement of the first seat portion with respect to the second seat portion between a first position and a second position of the first seat portion, wherein the first position corresponds to a position of the first seat portion in which the coil spring is in a compressed state and the second position corresponds to a position of the first seat portion in which the coil spring is in an extended state.
[010] In an embodiment, the second seat portion is pivotably coupled to the first seat portion and the elastomer is structured to allow a pivotal movement of the first seat portion with respect to the second seat portion.
[011] In an embodiment, the first seat portion is formed of a dome-shaped structure having a flat surface fixedly coupled to the twist beam and the second seat portion is formed of a hemispherical shell having a concave portion mounted on the dome-shaped structure of the first seat portion.
[012] In an embodiment, the hemispherical shell of the second seat portion includes a contour defined at an external surface thereof, the contour being configured to support the coil spring between the twist beam and the body of the vehicle.
[013] In an embodiment, the second seat portion includes a flange formed at a circumference of the hemispherical shell, the flange being adapted to limit the movement of the first seat portion with respect to the second seat portion.
[014] In an embodiment, the second seat portion is pivotably coupled to the first seat portion using a fastener.
[015] In an embodiment, the elastomers include polymers.
[016] In another aspect, the present disclosure relates to a suspension system of a vehicle. The suspension system comprises a twist beam and a coil spring mounted between the twist beam and a body of the vehicle. The suspension system further comprises a spring seat assembly adapted to be coupled to the twist beam. The spring seat assembly includes a first seat portion fixedly coupled to the twist beam and configured to move along with the twist beam, and a second seat portion movably coupled to the first seat portion and defining a cavity therebetween, the second seat portion being configured to support the coil spring. The spring seat assembly further includes an elastomer disposed in the cavity formed between the first seat portion and the second seat portion, wherein the elastomer is structured to allow a movement of the first seat portion with respect to the second seat portion.
[017] In an embodiment, the elastomer is structured to allow the movement of the first seat portion with respect to the second seat portion between a first position and a second position of the first seat portion, wherein the first position corresponds to a position of the first seat portion in which the coil spring is in a compressed state and the second position corresponds to a position of the first seat portion in which the coil spring is in an extended state.
[018] In an embodiment, the second seat portion is pivotably coupled to the first seat portion and the elastomer is structured to allow a pivotal movement of the first seat portion with respect to the second seat portion.
[019] In an embodiment, the first seat portion is formed of a dome-shaped structure having a flat surface fixedly coupled to the twist beam and the second seat portion is formed of a hemispherical shell having a concave portion mounted on the dome-shaped structure of the first seat portion.
[020] In an embodiment, the second seat portion is pivotably coupled to the first seat portion using a fastener.
[021] In yet another aspect, the present disclosure relates to a vehicle comprising a suspension system. The suspension system includes a twist beam and a coil spring mounted between the twist beam and a body of the vehicle. The suspension system further includes a spring seat assembly adapted to be coupled to the twist beam. The spring seat assembly includes a first seat portion fixedly coupled to the twist beam and configured to move along with the twist beam. The spring seat assembly further includes a second seat portion movably coupled to the first seat portion and defining a cavity therebetween, the second seat portion being configured to support the coil spring. The spring seat assembly furthermore includes an elastomer disposed in the cavity formed between the first seat portion and the second seat portion, wherein the elastomer is structured to allow a movement of the first seat portion with respect to the second seat portion.
[022] It is to be understood that the aspects and embodiments of the disclosure described above may be used in any combination with each other. Several of the aspects and embodiments may be combined together to form a further embodiment of the disclosure.
[023] The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.

BRIEF DESCRIPTION OF FIGURES
[024] The novel features and characteristics of the disclosure are set forth in the description. The disclosure itself, however, as well as a preferred mode of use, further objectives, and advantages thereof, will best be understood by reference to the following description of an illustrative embodiment when read in conjunction with the accompanying drawings. One or more embodiments are now described, by way of example only, with reference to the accompanying drawings wherein like reference numerals represent like elements and in which:

FIG. 1 illustrates a perspective view of a suspension system, including a spring seat assembly in accordance with an embodiment of the present disclosure along with various components of the suspension system;
FIG. 2 illustrates an exploded view of the spring seat assembly of FIG. 1 and illustrates various different components of the spring seat assembly, in accordance with an embodiment of the present disclosure; and
FIG. 3 illustrates an assembled view of the spring seat assembly of FIG. 2, in accordance with an embodiment of the present disclosure.

[025] Skilled artisans will appreciate that elements in the drawings are illustrated for simplicity and have not necessarily been drawn to scale. For example, the dimensions of some of the elements in the drawings may be exaggerated relative to other elements to help to improve understanding of embodiments of the present disclosure.

DETAILED DESCRIPTION
[026] While the disclosure is susceptible to various modifications and alternative forms, specific embodiment thereof has been shown by way of example in the figures and will be described in detail below. It should be understood, however that it is not intended to limit the disclosure to the particular forms disclosed, but on the contrary, the disclosure is to cover all modifications, equivalents, and alternatives falling within the spirit and the scope of the disclosure as defined by the appended claims.
[027] Before describing detailed embodiments, it may be observed that the novelty and inventive step that are in accordance with the present disclosure resides in a spring seat assembly for a suspension system of a vehicle and the suspension system of the vehicle. It is to be noted that a person skilled in the art may be motivated from the present disclosure and modify the various constructions of the spring seat assembly. However, such modification should be construed within the scope of the disclosure. Accordingly, the drawings are showing only those specific details that are pertinent to understanding the embodiments of the present disclosure so as not to obscure the disclosure with details that will be readily apparent to those of ordinary skill in the art having benefit of the description herein.
[028] The terms “comprises”, “comprising”, or any other variations thereof, are intended to cover a non-exclusive inclusions, such that a setup, device that comprises a list of components does not include only those components but may include other components not expressly listed or inherent to such setup or device. In other words, one or more elements in a system or apparatus proceeded by “comprises… a” does not, without more constraints, preclude the existence of other elements or additional elements in the system or apparatus.
[029] Reference will now be made to the exemplary embodiments of the disclosure, as illustrated in the accompanying drawings. Wherever possible same numerals will be used to refer to the same or like parts.
[030] Embodiments of the disclosure are described in the following paragraphs with reference to FIGS. 1 to 3. In the figures, the same element or elements which have same functions are indicated by the same reference signs.
[031] Referring to FIG. 1, a suspension system (100) for a vehicle, for example an articulated vehicle, comprising a spring seat assembly (50) for supporting a coil spring (10) between a suspension link, such as a twist beam (90), of the suspension system (100) and a body frame (not shown) of the vehicle, according to an embodiment of the present disclosure, is disclosed. The suspension system (100) is disposed below the body frame of the vehicle and includes a suspension frame (95) provided between a pair of right and left side members of the body frame and connected to wheel ends (96) of the vehicle. The suspension frame (95) serves for connecting an axle of the vehicle to each of left and right wheel ends (96). The suspension frame (95) includes the twist beam (90) and a shock absorber (80) mounted on the twist beam (90). Between a lower portion of the body frame of the vehicle and the twist beam (90), the coil spring (10) is interposed. Also, on an upper surface of the twist beam (90), the spring seat assembly (50) for supporting the coil spring (10) of the suspension system (100) is mounted.
[032] As readily understood to a skilled person, a suspension system of a vehicle is essentially required for controlling the vehicle’s handling and braking for safety and keeping the passengers comfortable from bumps, vibrations etc. When the vehicle passes over an uneven surface (or uneven road), vibrations and/or impacts transmitted from the uneven surface may be reduced by the suspension system so that the vibrations and/or impacts experienced by the vehicle body and/or the passengers can be reduced. Said reduction in vibrations and/or impacts is facilitated by the coil spring as it absorbs/stores the vibrations by way of compression or extension between the twist beam and the body frame of the vehicle.
[033] Referring now to FIGS. 2 and 3, the spring seat assembly (50) for supporting the coil spring (10) between the twist beam (90) and body frame of the vehicle, according to an embodiment of the present disclosure, is disclosed. In an embodiment, the spring seat assembly (50) may be adapted to hold or mount the coil spring (10) between the twist beam (90) and body frame of the vehicle. As can be seen in FIGS. 2 and 3, the spring seat assembly (50) comprises a first seat portion (20), a second seat portion (30) and an elastomer (40). The first seat portion (20) is movably coupled with the second seat portion (30). In accordance with the present disclosure, the elastomer (40) allows a movement of the first seat portion (20) with respect to the second seat portion (30). Various constructional and functional features of the spring seat assembly (50) shall be explained in the subsequent paragraphs of the present disclosure.
[034] FIG. 2 illustrates an exploded view of the spring seat assembly (50) and FIG. 3 illustrates an assembled view of the spring seat assembly (50), both of which provide the constructional features of the components of the spring seat assembly (50). Within the scope of the present disclosure, the first seat portion (20) is fixedly mounted on the upper surface of the twist beam (90) of the suspension system (100). Accordingly, a skilled person can readily contemplate that, when the vehicle passes over any uneven surface (or an uneven road or a bump or through a pit), the vibrations or the jerk experienced by the twist beam is transmitted to the first seat portion (20) of the spring seat assembly (50), causing the first seat portion (20) to follow a curved trajectory along with the swinging/pivoting motion of the twist beam (90). For instance, when the vehicle passes over a bump, at least a portion of the twist beam (90) is caused to move to a raised position that is closer to the body frame of the vehicle, thereby compressing the coil spring (10) mounted between the twist beam (90) and the body frame of the vehicle. In said raised position, the twist beam (90) is at an angle with respect to a normal horizontal axis of the twist beam (90) (on an even surface). For the reason that the first seat portion (20) is fixedly mounted to the twist beam (90), the first seat portion (20) gets oriented at an angle with respect to the normal horizontal axis. Similarly, when the vehicle passes through a pit or the twist beam (90) rebounds, at least a portion of the twist beam (90) is caused to move to a lowered position away or farther from the body frame of the vehicle, thereby extending the coil spring (10). In said lowered position also, the twist beam (90) is at an angle with respect to the normal horizontal axis of the twist beam (90) (on an even surface). Again, for the reason that the first seat portion (20) is fixedly mounted to the twist beam (90), the first seat portion (20) gets oriented at an angle with respect to the normal horizontal axis.
[035] In view of the above, it can be contemplated that the twist beam (90) and the first seat portion (20) of the spring seat assembly (50) are adapted to pivot between the raised position and the lowered position. Within the scope of the present disclosure, the first seat portion (20) may be mounted to the twist beam (90) by any commonly known technique in the art, for example by welding, fastening, etc.
[036] Without limiting the scope of the present disclosure, the first seat portion (20) is formed of a dome-shaped structure, as shown in FIG. 2. The dome-shaped structure includes a convex segment (22) and a flat surface (24). The first seat portion (20) may be coupled to the twist beam (90) by mounting the flat surface (24) to the upper surface of the twist beam (90). In an embodiment, the dome-shaped structure of the first seat portion (20) may be hollow. Alternatively, the dome-shaped structure may be formed as a solid body. Additionally, the first seat portion (20) may include one or more flanges extending from the convex segment (22) and/or the flat surface (24), wherein the one or more flanges may be adapted to be coupled with the other elements/ links of the suspension system (100).
[037] In accordance with the present disclosure, the first seat portion (20) and the components thereof may be formed of any suitable material providing desired strength and durability, for example, hard carbon steel, iron and the like. Also, the first seat portion (2) may be manufactured using any known technique in the art, for example casting, additive manufacturing, 3D printing or the like.
[038] Referring again to FIG. 2, an illustration of the second seat portion (30) of the seat spring assembly (50), according to an embodiment of the present disclosure, is disclosed. Within the scope of the present disclosure, the second seat portion (30) is movably coupled to the first seat portion (20). Further, the second seat portion (30) is adapted and configured to support the coil spring (10) between the twist beam (90) and the body frame of the vehicle. In accordance with the present disclosure, the second seat portion (30) is formed of a hemispherical shell having a concave portion (32) adapted to be mounted on the dome-shaped structure of the first seat portion (20). In an embodiment, the concave portion (32) of the hemispherical shell is adapted to be mounted on the convex segment (22) of the dome-shaped structure of the first seat portion (20).
[039] In accordance with the present disclosure, the second seat portion (30) includes a disc (34) circumferentially formed at an internal surface of the concave portion (32) of the hemispherical shell. In an embodiment, the disc (34) may be integrally formed with the hemispherical shell. Alternatively, the disc (34) may be separately mounted on the internal surface of the concave portion (32) of the hemispherical shell. It is pertinent to note that when the concave portion (32) of the hemispherical shell is mounted on the convex segment (22) of the first seat portion (20), the concave portion (22) and the disc (34) of the hemispherical shell of the second seat portion (30) defines a cavity (26) between the second seat portion (30) and the first seat portion (20). In accordance with the present disclosure, the spring seat assembly (50) of the present disclosure comprises the elastomer (40) disposed within the cavity (26) defined between the second seat portion (30) and the first seat portion (20). The elastomer (40) is structured to allow a movement of the first seat portion (20) with respect to the second seat portion (30).
[040] The hemispherical shell of the second seat portion (30) further includes a contour defined at an external surface of the hemispherical shell. The contour may be configured to support the coil spring (10) between the twist beam (90) and the body frame of the vehicle. In an embodiment, a size of the contour may correspond to an internal diameter of the coil spring (10) for holding the coil spring between the twist beam (90) and the body frame of the vehicle. In alternate embodiments, the hemispherical shell may include one or more attachment ridges or fasteners to hold and/or secure or mount the coil spring (10) between the twist beam (90) and the body frame of the vehicle. Further, the second seat portion (30) includes a flange (36) formed at an external circumference of the hemispherical shell, as shown in FIG. 3. The flange (36) may be adapted to limit the movement of the first seat portion (20) with respect to the second seat portion (30).
[041] In an embodiment of the present disclosure, the second seat portion (30) is coupled to the first seat portion (20) by way of a fastener (97) including, but not limited to, a fastener, bolt, screw, stud, and the like, and a washer (98). The second seat portion (30) and the first seat portion (20) may define through-holes adapted to receive the fastener (97). The fastener (97) may be configured to pivotally couple the second seat portion (30) to the first seat portion (20) and facilitate a pivotal movement between the second seat portion (30) and the first seat portion (20). In said embodiment, the elastomer (40) disposed within the cavity (26) defined between the second seat portion (30) and the first seat portion (20) may be structured to allow the pivotal movement of the first seat portion (20) with respect to the second seat portion (30). Also, in said embodiment, the flange (36) may be adapted to limit the pivotal movement of the first seat portion (20) with respect to the second seat portion (30).
[042] In accordance with the present disclosure, the second seat portion (30) and the components thereof may be formed of any suitable material providing desired strength and durability, for example, hard carbon steel, iron and the like. Also, the second seat portion (30) may be manufactured using any known technique, for example casting, additive manufacturing, 3D printing or the like.
[043] As forestated, the spring seat assembly (50) of the present disclosure includes the elastomer (40) disposed within the cavity (26) defined between the second seat portion (30) and the first seat portion (20). As readily understood to a skilled person, the elastomer (40) may be understood as polymers having viscosity as well as elasticity and adapted to regain original shape and size after being stretched or deformed. In accordance with the present disclosure, the elastomer (40) of the spring seat assembly (50) includes, but not limited to, natural rubber, isoprene rubber, butadiene rubber, polychloroprene, isoprene, styrene-butadiene, nitrile rubber, polyacrylic rubber, silicone rubber, etc.
[044] The elastomer (40) is structured to allow the movement of the first seat portion (20) with respect to the second seat portion (30). In an embodiment, the second seat portion (30) is pivotably coupled to the first seat portion (20), and the elastomer (40) is structured to allow a pivotal movement of the first seat portion (20) with respect to the second seat portion (30). In accordance with the present disclosure, the elastomer (40) is structured to allow the movement of the first seat portion (20) with respect to the second seat portion (30) between a first position and a second position of the first seat portion (20). The first position may correspond to a position of the first seat portion (20) in which the coil spring (10) is in a compressed state, for example in instances when the vehicle passes over a bump. Also, the second position corresponds to a position of the first seat portion (20) in which the coil spring (10) is in an extended state, for example in instances when the vehicle passes through a pit or the twist beam (90) rebounds.
[045] The function and operation of the spring seat assembly (50) of the present disclosure shall be described in the subsequent paragraphs:
[046] Within the scope of the present disclosure, when the vehicle passes over a bump or through a pit or the twist beam (90) rebounds, the twist beam (90) of the suspension system (100) attains a position corresponding to the raised position or the lowered position or an intermediary position therebetween. For the reason that the first seat portion (20) is fixedly mounted on the twist beam (90), the twist beam (90) causes the first seat portion (20) of the spring seat assembly (50) to incline with respect to the normal horizontal axis. However, compared to the conventional suspension systems including spring seat(s), the spring seat assembly (50) of the present disclosure includes the second seat portion (30) movably (or pivotably) coupled with the first seat portion (20), and the elastomer (40) that is structured to allow the movement (or the pivotal movement) of the first seat portion (20) with respect to the second seat portion (30), upon inclination of the first seat portion (20) with respect to the normal horizontal axis. Due to said relative movement of the first seat portion (20) with respect to the second seat portion (30), the spring seat assembly (50) of the present disclosure ensures that the second seat portion (30) remains in its natural stable position corresponding to an orientation of the second seat portion (30) in neutral state (i.e., during traction of the vehicle on an even surface). It can accordingly be contemplated that because the second seat portion (30) substantially remains at its stable position, the coil spring (10) positioned between the twist beam (90) and the body frame of the vehicle remains in an upright orientation and is only compressed or extended, and does not bend, unlike the coil springs in the conventional suspension system(s).
[047] The above configuration of the spring seat assembly (50) accordingly prevents/avoids uneven distribution of load in the coil spring (10), increase of high frequency vibrations, stress concentration and weight in the coil spring (10), thereby improving the work cycle of the coil spring (10) and reducing manufacturing and maintenance costs of the suspension system (100) and/or the coil spring (10).
[048] In addition, since the spring seat assembly (50) of the present disclosure avoids bending of the coil spring (10), the issue of spring buckling is largely reduced, and therefore, coil springs with high length to diameter ratio can be conveniently employed in the suspension system (100) without compromising on the performance of the suspension assembly.
[049] While considerable emphasis has been placed herein on the particular features of this disclosure, it will be appreciated that various modifications can be made, and that many changes can be made in the preferred embodiments without departing from the principles of the disclosure. These and other modifications in the nature of the disclosure or the preferred embodiments will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the disclosure and not as a limitation.

REFERAL NUMERICALS

PARTICULARS REFERRAL NUMERAL
Suspension system 100
Spring seat assembly 50
Coil spring 10
First seat portion 20
Convex segment 22
Flat surface 24
Cavity 26
Second seat portion 30
Concave portion 32
Disc 34
Flange 36
Elastomer 40
Shock absorber 80
Twist beam 90
Suspension frame 95
Wheel ends 96
Fastener 97
Washer 98

EQUIVALENTS:
[050] The embodiments herein and the various features and advantageous details thereof are explained with reference to the non-limiting embodiments in the description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.
[051] The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.
[052] Throughout this specification the word “comprise”, or variations such as “comprises” or “comprising”, will be understood to imply the inclusion of a stated element, integer or step, or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps.
[053] The use of the expression “at least” or “at least one” suggests the use of one or more elements or ingredients or quantities, as the use may be in the embodiment of the disclosure to achieve one or more of the desired objects or results.
[054] Any discussion of documents, acts, materials, devices, articles and the like that has been included in this specification is solely for the purpose of providing a context for the disclosure. It is not to be taken as an admission that any or all of these matters form a part of the prior art base or were common general knowledge in the field relevant to the disclosure as it existed anywhere before the priority date of this application.
[055] The numerical values mentioned for the various physical parameters, dimensions or quantities are only approximations and it is envisaged that the values higher/lower than the numerical values assigned to the parameters, dimensions or quantities fall within the scope of the disclosure, unless there is a statement in the specification specific to the contrary.