Description:FORM 2
THE PATENTS ACT, 1970
[39 OF 1970]
&
THE PATENTS RULES, 2003

COMPLETE SPECIFICATION
[See Section 10, Rule 13]

ROLLOVER PROTECTION SYSTEM FOR A VEHICLE

MAHINDRA & MAHINDRA LIMITED, A COMPANY REGISTERED UNDER THE INDIAN COMPANIES ACT, 1913, HAVING ADDRESS AT MAHINDRA RESEARCH VALLEY, MAHINDRA WORLD CITY, PLOT NO.41/1, ANJUR P.O., CHENGALPATTU, KANCHIPURAM DISTRICT, TAMILNADU – 603004, INDIA

THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED

TECHNICAL FIELD OF THE INVENTION:
[001] The present invention relates to rollover protection system (ROPS) for vehicles.
BACKGROUND OF THE INVENTION:
[002] Rollover protective system (ROPS) is used in vehicles to protect occupants from injuries caused during vehicle rollover accidents. Commonly used two-post ROPS have a vertical or a slightly tilted orientation and are mounted to the rear axle of the vehicle. The existing designs of the ROPS in vehicle encounter a plurality of challenges in terms of structural durability and safety. One primary issue arises from the high loading columns within the ROPS. These columns are susceptible to buckling under certain conditions, leading to localized strains in the system. The consequence of this buckling is the generation of high local strains within the ROPS which may lead to structural failures.
[003] Further, there is a requirement to maintain low stiffness in the ROPS, as use of an overly stiffed ROPS, results in the generation of high peak decelerations and reaction forces may be detrimental to the occupant’s chances of survival during a rollover. The inherent design dilemma revolves around the need to find an optimal balance between two conflicting objectives. This is crucial for enabling effective energy absorption during vehicle rollovers, ensuring that the system performs its fundamental safety function. On the other hand, there is a pressing need to prevent the occurrence of high local strains that can compromise the overall structural durability.
[004] The existing designs strive to meet the regulatory safety standards, with ROPS being a mandatory safety feature in vehicles designed to absorb energy and protect occupants during rollover incidents. However, despite the emphasis on low stiffness to facilitate energy absorption, a persistent challenge remains within these designs.
[005] Thus, it is required to provide a ROPS that satisfies the dual criteria of adequate flexibility to absorb energy and adequate stiffness to maintain a survival zone around the occupant. In light of the foregoing conventional problems, there remains a need for technology to overcome these challenges by providing a support system to enhance the overall structural durability and safety performance of vehicle ROPS.
OBJECTIVES OF THE INVENTION:
[006] The primary objective of the present invention is to mitigate local straining issues observed in vehicle Rollover Protection System (ROPS), particularly in high loading columns, to prevent structural failures and ensure occupant safety during rollover incidents.
[007] Yet another objective of the present invention is to improve the structural performance of vehicle ROPS, specifically targeting a significant improvement in stiffness, enhancing the overall durability and reliability of the ROPS under load-bearing events.
[008] Further objective of the present invention is to form a cross configuration using a bracket for strengthening a specific area experiencing high strains without affecting the overall design's low stiffness requirement for energy absorption.
SUMMARY OF THE INVENTION:
[009] In one aspect of the present invention, a rollover protection system (ROPS) for a vehicle is provided. The rollover protection system (ROPS) includes at least one upper supporting member having an inverted U-shape, positioned over a driving area of the vehicle. The ROPS further includes at least one lower supporting member that is configured to support each end of the upper supporting member. The ROPS further includes a connector that is located on each side of the upper supporting member. The connector is configured to couple the upper supporting member with the corresponding lower supporting member along a first end portion thereof. The ROPS further includes a reinforcement member that is mounted on the rear axle of the vehicle to support a second end portion of each lower supporting member. The ROPS further includes a stiffener plate that is secured on each of the reinforcement members and the lower supporting members to absorb and transfer the load to the vehicle. The ROPS further includes a stress distribution bracket that is positioned on each of the lower supporting members in proximity to the stiffener plate to facilitate uniform stress distribution, thereby preventing high local strains in the lower supporting members.
[0010] In accordance with an embodiment of the present invention, the stress distribution bracket is a c-shaped bracket that is configured to position over the lower supporting member.
[0011] In accordance with an embodiment of the present invention, the stress distribution bracket is a knee shaped bracket.
[0012] In accordance with an embodiment of the present invention, the stress distribution bracket is made of a low carbon steel (ST52) material.
[0013] In accordance with an embodiment of the present invention, the stress distribution bracket has a thickness in a range of 2-3 mm.
[0014] In accordance with an embodiment of the present invention, the stiffener plate is a knee shaped bracket.
[0015] In accordance with an embodiment of the present invention, the first end portion is a top end of the lower supporting member, and the second end portion is a bottom end of the supporting member.
BRIEF DESCRIPTION OF ACCOMPANYING DRAWINGS:
[0016] The detailed description is described with reference to the accompanying figures.
[0017] Figure 1A depicts a rollover protection system (ROPS) for a vehicle with a stiffener plate, in accordance with an aspect of the present disclosure;
[0018] Figure 1B depicts a magnified view of rollover protection system (ROPS) with the stiffener plate, in accordance with an aspect of the present disclosure;
[0019] Figure 2 depicts a strain analysis of rollover protection system (ROPS) with the stiffener plate, in accordance with an aspect of the present disclosure;
[0020] Figure 3 depicts a rollover protection system (ROPS) for a vehicle with the stiffener plate and a stress distribution bracket, in accordance with an aspect of the present disclosure;
[0021] Figure 4 depicts a magnified view of rollover protection system (ROPS) with the stiffener plate and the stress distribution bracket, in accordance with an aspect of the present disclosure;
[0022] Figure 5 depicts a strain analysis of rollover protection system (ROPS) with the stiffener plate and the stress distribution bracket, in accordance with an aspect of the present disclosure; and
[0023] Figure 6 depicts a graph illustrating a strain variation between ROPS with only the stiffener plate vis-à-vis ROPS with the stiffener plate and the stress distribution bracket, in accordance with an aspect of the present disclosure.
DETAILED DESCRIPTION OF THE INVENTION:
[0024] The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of the invention as defined by the description. It includes various specific details to assist in the understanding, but these are to be regarded as merely exemplary. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
[0025] The terms and words used in the following description are not limited to the bibliographical meanings but are merely used by the inventor to enable a clear and consistent understanding of the invention. Accordingly, it should be apparent to those skilled in the art that the following description of the present invention is provided for illustration purposes only.
[0026] It is to be understood that the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.
[0027] Referring to Figure 1A, according to an aspect, illustrates a rollover protection system (ROPS) (100) designed for integration into vehicles. This ROPS (100) includes at least one upper supporting member (102), at least one lower supporting member (104), at least one connector (106), a reinforcement member (108), and a stiffener plate (110).
[0028] In accordance with an aspect of the present invention, the upper supporting member (102) has an inverted U-shape. The upper supporting member (102) is placed directly above a driving area of the vehicle to effectively bear the weight and forces exerted during a rollover event. In addition, the upper supporting member (102) maintains the structural integrity of the ROPS (100) and prevents structural failure as the upper supporting member (102) is configured to directly counteract the downward forces exerted during any rollover events. Additionally, this placement allows for optimal coverage over the vehicle's driving area and ensures comprehensive protection for occupants. The upper supporting member (102) creates a barrier by spanning across the width of the vehicle to prevent the collapse of the vehicle's roof during a rollover event that reduces the risk of injury or fatality to occupants.
[0029] In accordance with an aspect of the present invention, the lower supporting member (104) is configured to provide support to each end of the upper supporting member (102). The ROPS (100) enhances the safety of occupants within the vehicle by distributing the load effectively through the lower supporting members (104). This configuration ensures stability and structural integrity in the event of the vehicle rollover event.
[0030] In some aspects of the present invention, the lower supporting member (104) includes a first end portion (105) and a second end portion (107). The first end portion (105) is a top end of the lower supporting member (104) and the second end portion (107) is a bottom end of the lower supporting member (104).
[0031] In accordance with an aspect of the present invention, the connector (106) is positioned on each side of the upper supporting member (102). The connector (106) configured to facilitate coupling between the upper supporting member (102) and the corresponding lower supporting member (104) along the first end portion (105). The connector (106) facilitates a coupling mechanism that ensures structural integrity and stability within the ROPS.
[0032] The ROPS (100) effectively distributes and withstands forces encountered during rollover events by securely fastening the upper supporting member (102) to the lower supporting member (104) using the connectors (106). This connection at the first end portion (105) of the supporting members (104) ensures that they act as a unified system, capable of resisting deformation and maintaining the protective enclosure over the driving area of the vehicle.
[0033] Additionally, the connectors (106) on each side of the upper supporting member (102) at a predefined position to ensure a balanced and symmetrical support and enhance overall stability of the ROPS (100). This symmetric orientation of the connectors (106) assists in even distribution of the loads/ stresses experienced during operation, thereby enhancing the safety and reliability of the system.
[0034] In accordance with an aspect of the present invention, the reinforcement member (108) is strategically mounted on the rear axle of the vehicle to provide support to the lower supporting member (104) through its second end portion (107). The reinforcement member (108) effectively anchors the lower supporting member (104) by being mounted on the rear axle thereby contributing to the overall strength and reliability of the ROPS (100). The reinforcement member (108) helps to distribute loads/ stresses efficiently throughout the system by enhancing its ability to withstand impact and protect occupants within the vehicle.
[0035] In accordance with an aspect of the present invention, the stiffener plate (110) serves as a structural component that is strategically placed and secured along a juncture of the reinforcement members (108) and the second end portion (107) of the lower supporting members (104). The stiffener plate (110) effectively distributes and absorbs the forces exerted on the ROPS (100) during the potential roll-over event as being mounted on both the reinforcement members (108) and the second end portion (107) of the lower supporting members (104). This distribution of force helps in absorbing and transferring loads/ stresses experienced by the ROPS (100) to vehicle's frame, which could otherwise compromise the integrity of the ROPS (100).
[0036] The ROPS (100) with the stiffener plate (110), as shown in Figures 1A and 1B, is engineered to meet stringent safety standards and regulatory requirements. The integration of the upper supporting member (102), lower supporting member (104), connector (106), reinforcement member (108), and stiffener plate (110) impart enhanced structural robustness and crashworthiness of the vehicle ROPS (100).
[0037] Referring to Figure 2, according to an aspect, a strain analysis of the rollover protection system (ROPS) (100) with the stiffener plate (110) is illustrated to reveal critical insights into the structural behavior under load-bearing conditions. The localized high strains are observed, particularly in areas adjacent to the stiffener plate (110). These elevated strains signify areas of potential structural weakness, where the ROPS (100) may be susceptible to buckling or failure during rollover incidents. The visualization of strain distribution provides valuable data for assessing the structural integrity of the ROPS (100) and identifying areas requiring improvement. Further, even after increasing the length of the stiffener plate (110), the same localized high strains are observed, particularly in areas adjacent to the stiffener plate (110).
[0038] Referring to Figure 3, according to an aspect, the present invention discloses a rollover protection system (ROPS) (100) which is designed to enhance vehicle safety and structural integrity.
[0039] In accordance with an aspect of the present invention, the ROPS (100) includes a stress distribution bracket (112) that is positioned on each of the lower supporting members (104) in proximity to the stiffener plate (110) to facilitate uniform stress distribution, thereby preventing high local strains in the lower supporting members (104). The stress distribution bracket (112) arrangement may form a cross configuration as shown in the magnified view of Figure 4. This cross configuration of stress distribution brackets (112) with the stiffener plates (110) significantly enhances the energy absorption and facilitate uniform stress distribution as well during load-bearing events, thereby fortifying the ROPS (100) against potential structural failures. The present invention addresses the critical issue of high localized straining observed in traditional ROPS designs by incorporating this cross configuration and thus improves overall safety and durability.
[0040] Furthermore, the cross configuration of stress distribution brackets (112) and stiffener plates (110) not only enhances energy absorption but also contributes to the overall robustness of the ROPS (100). This comprehensive approach to structural reinforcement ensures that the ROPS (100) meets or exceeds regulatory safety standards and homologation requirements, thereby enhancing market competitiveness and facilitating widespread adoption within the agricultural machinery industry. The present invention represents a significant advancement in vehicle safety technology, providing operators with enhanced protection and peace of mind during operation.
[0041] In some aspects of the present invention, the stress distribution bracket (112) is a c-shaped bracket configured to position over the lower supporting members (104).
[0042] In some aspects of the present invention, the stress distribution bracket (112) is a knee shaped bracket.
[0043] In some aspects of the present invention, the stress distribution bracket (112) is made of low carbon steel (ST52) material.
[0044] In some aspects of the present invention, the stress distribution bracket (112) has a thickness in a range of 2-3 mm.
[0045] In some aspects of the present invention, the stiffener plate (110) may be in a knee shaped plate.
[0046] Referring to Figure 5, according to an aspect, illustrates a strain analysis of the ROPS (100) with the stiffener plate (110) and the c-shaped stress distribution bracket (112). The strain analysis conducted on the ROPS (100) may serve multiple purposes, including validating the structural design, optimizing material usage, and enhancing overall safety. Further, the strain analysis aids in predicting the ROPS (100) behavior under different operating conditions, such as during normal operation, sudden maneuvers, or rollover events.
[0047] Figure 6 illustrates a strain validation comparison between the ROPS (100) with only the stiffener plate (110) vis-à-vis the ROPS (100) with the stiffener plate (110) and the C-shaped bracket. This comparison serves as a crucial evaluation method to assess the effectiveness and efficacy of the proposed ROPS (100) of the present invention. The strain values of the ROPS with only the stiffener plate (110) vis-à-vis the ROPS (100) with the stiffener plate (110) and the C-shaped bracket are shown in the below Table 1.
ROPS
(with the stiffener plate)
ROPS of present invention
(with the stiffener plate and the stress distribution bracket) Strain variation in percentage (%)
ROPS (strain) 0.202 0.098 51.28
Table 1 - Strain values of the ROPS
[0048] Furthermore, the inclusion of the stress distribution bracket (112) for reducing strain, as per the present invention, is not limited solely to ROPS applications. Its versatility extends across various domains where strain reduction and enhancement of structural integrity are paramount. This innovative bracket design can be seamlessly integrated into a wide array of applications across industries such as automotive, aerospace, construction, and beyond.
[0049] The present invention offers a plurality of benefits to the field of agricultural machinery safety and vehicle design. Firstly, it effectively eliminates local high strains in vehicle ROPS, addressing a crucial issue that can lead to structural failures during rollover incidents. By incorporating C-shaped brackets in a cross configuration alongside existing stiffener plates, the invention significantly improves local stiffness without compromising stiffness or energy absorption characteristics. This enhancement in structural performance translates to approximately a 51.28% improvement locally, ensuring better protection for vehicle occupants. Additionally, the invention facilitates compliance with safety regulations and homologation standards, enabling vehicles equipped with this novel support structure to pass regulatory tests with ease. This not only enhances vehicle safety but also improves market competitiveness, as manufacturers can offer safer and more reliable products to customers globally. Overall, the invention represents a practical and efficient solution to enhance vehicle ROPS' structural integrity and ensure operator safety during rollover incidents.
[0050] Although there has been shown and described the preferred embodiment of the present invention, it will be readily apparent to those skilled in the art that modifications may be made thereto which do not exceed the scope of the appended claims. Therefore, the scope of the invention is only to be limited by the following claims.
, Claims:We Claim:
1. A rollover protection system (ROPS) (100) for a vehicle comprising:
at least one upper supporting member (102) positioned over a driving area of the vehicle;
at least one lower supporting member (104) configured to support upper supporting member (102);
a connector (106) located on each side of the upper supporting member (102), the connector (106) configured to couple the upper supporting member (102) with the corresponding lower supporting member (104) along a first end portion (105) thereof;
a reinforcement member (108) mounted on a rear axle of the vehicle, the reinforcement member (108) configured to support a second end portion (107) of each lower supporting member (104);
a stiffener plate (110) secured along a juncture of the reinforcement members (108) and the lower supporting members (104); and
a stress distribution bracket (112) positioned on each of the lower supporting members (104) in proximity to the stiffener plate (110), the stress distribution bracket (112) configured to facilitate uniform stress distribution by preventing high local strains in the lower supporting members (104).
2. The rollover protection system (100) as claimed in claim 1, wherein the stress distribution bracket (112) is a c-shaped bracket configured to position over the lower supporting members (104).
3. The rollover protection system (100) as claimed in claim 1, wherein the stress distribution bracket (112) is a knee shaped bracket.
4. The rollover protection system (100) as claimed in claim 1, wherein the stress distribution bracket (112) is made of low-carbon steel (ST52).
5. The rollover protection system (100) as claimed in claim 1, wherein the stress distribution bracket (112) has a thickness in a range of 2 to 3 mm.
6. The rollover protection system (100) as claimed in claim 1, wherein the stiffener plate (110) is a knee shaped plate.
7. The rollover protection system (100) as claimed in claim 1, wherein the first end portion (105) of lower supporting member (104) defines a top end of the lower supporting member (104).
8. The rollover protection system (100) as claimed in claim 1, wherein the second end portion (107) of lower supporting member (104) defines a bottom end of the lower supporting member (104).
9. The rollover protection system (100) as claimed in claim 1, wherein the upper supporting member (102) has an inverted U shape.

Dated this 27th day of March, 2024

For MAHINDRA & MAHINDRA LIMITED
By their Agent

(GIRISH VIJAYANAND SHETH) (IN/PA 1022)
KRISHNA & SAURASTRI ASSOCIATES LLP