WO2026018253A1 - Système de suspension pour véhicule utilitaire - Google Patents

Système de suspension pour véhicule utilitaire

Info

Publication number
WO2026018253A1
WO2026018253A1 PCT/IN2025/050251 IN2025050251W WO2026018253A1 WO 2026018253 A1 WO2026018253 A1 WO 2026018253A1 IN 2025050251 W IN2025050251 W IN 2025050251W WO 2026018253 A1 WO2026018253 A1 WO 2026018253A1
Authority
WO
WIPO (PCT)
Prior art keywords
suspension
leaf spring
assembly
bracket
vehicle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/IN2025/050251
Other languages
English (en)
Inventor
Krishna Srikanth Achanta
Sanket Prakash Kadale
Sudhanshu Kailash SHUKLA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ve Commercial Vehicles Ltd
Original Assignee
Ve Commercial Vehicles Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ve Commercial Vehicles Ltd filed Critical Ve Commercial Vehicles Ltd
Publication of WO2026018253A1 publication Critical patent/WO2026018253A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G11/00—Resilient suspensions characterised by arrangement, location or kind of springs
    • B60G11/02—Resilient suspensions characterised by arrangement, location or kind of springs having leaf springs only
    • B60G11/04—Resilient suspensions characterised by arrangement, location or kind of springs having leaf springs only arranged substantially parallel to the longitudinal axis of the vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G11/00—Resilient suspensions characterised by arrangement, location or kind of springs
    • B60G11/32—Resilient suspensions characterised by arrangement, location or kind of springs having springs of different kinds
    • B60G11/34—Resilient suspensions characterised by arrangement, location or kind of springs having springs of different kinds including leaf springs
    • B60G11/38—Resilient suspensions characterised by arrangement, location or kind of springs having springs of different kinds including leaf springs and also rubber springs
    • B60G11/42—Resilient suspensions characterised by arrangement, location or kind of springs having springs of different kinds including leaf springs and also rubber springs the rubber springs being attached to sprung part of the vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G7/00—Pivoted suspension arms; Accessories thereof
    • B60G7/04—Buffer means for limiting movement of arms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/10—Type of spring
    • B60G2202/11—Leaf spring
    • B60G2202/112—Leaf spring longitudinally arranged
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/40—Auxiliary suspension parts; Adjustment of suspensions
    • B60G2204/45—Stops limiting travel
    • B60G2204/4502—Stops limiting travel using resilient buffer

Definitions

  • the invention relates to suspension systems provided on commercial vehicles. It more particularly relates to suspension systems utilising leaf springs.
  • Suspension is an essential component within the commercial vehicle industry.
  • the most common and reliable type of suspension used in today's commercial vehicle industry is leaf spring suspension.
  • these mechanical suspensions provide best- in-class robustness.
  • ride and comfort have taken a steep interest in today’s market, specifically in the BUS segment.
  • air suspension When air suspension first appeared, it brought about another revolution because it offered the best ride comfort available.
  • the basic idea behind how air suspension responds is that it dynamically adjusts pneumatic pressure to maintain a steady ride frequency by varying its internal stiffness.
  • mechanical springs work on the principle of constant stiffness, this is not possible.
  • the objective of the present invention is to provide a suspension system for commercial vehicles that can provide variable stiffness.
  • the suspension system for a commercial vehicle comprises of a front leaf spring suspension, and a rear leaf spring suspension.
  • the front leaf spring suspensions are mounted on either sides of the vehicle along the front of the vehicle chassis and, at their one end through their front suspension front hanger backet that is fixed on the vehicle’s chassis and at their other end through their front suspension rear backet that are fixed at position behind the mounting position of the front suspension front hanger backet on the vehicle’s chassis.
  • a spacer and a front spacer bracket and mounting cup assembly of the front leaf spring suspension that is provided with a front mounting cup are together fixed in their position on the vehicle chassis using conventional fastening means.
  • the spacer and the front spacer bracket and mounting cup assembly are so positioned on the vehicle chassis that the centre of an auxiliary foam spring front held within said front mounting cup is aligned with the centre of a front U bolt clamp of the front leaf spring suspension.
  • the rear leaf spring suspensions are mounted on either sides of the vehicle along the rear of the vehicle chassis and, at their one end through their rear suspension front hanger bracket that are fixed on the vehicle’s chassis, and at their other end through their rear hanger bracket that are fixed at position behind the mounting position of the rear suspension front hanger backet on the vehicle’s chassis.
  • a rear auxiliary foam spring is held within a rear auxiliary foam spring bracket assembly of the rear leaf spring suspension.
  • the rear auxiliary foam spring bracket assembly is itself attached to a rear frame support bracket through conventional fastening means.
  • the rear frame support bracket is in turn fixed on the vehicle’s chassis in a position such that the centre of the rear auxiliary foam spring is aligned with the centre of a rear U bolt clamp of the rear leaf spring suspension, and an external rubber bump stopper that is also attached on lower surface of the rear auxiliary foam spring bracket assembly is aligned with the top surface of the rear U bolt clamp of the rear leaf spring suspension.
  • Figure 1 discloses a suspension system for a commercial vehicle as fitted on the vehicle chassis.
  • Figure 2 discloses the exploded view of the front leaf spring suspension as fitted on the vehicle chassis in accordance with the present invention, as disclosed in Figure 1.
  • Figure 3 discloses the exploded view of the rear leaf spring suspension in accordance with the present invention, as disclosed in Figure 1.
  • Figure 4 discloses the isometric view of the unladen condition of the front leaf spring suspension, as disclosed in Figure 2.
  • Figure 5 discloses the isometric view of the laden condition of the front leaf spring suspension, as disclosed in Figure 2.
  • Figure 6 discloses the spacer bracket and mounting cup assembly as provided in the front leaf spring suspension disclosed in Figure 2.
  • Figure 7 discloses the rear auxiliary foam spring as provided in the rear leaf spring suspension disclosed in Figure 3.
  • Figure 8 discloses the rear auxiliary foam spring bracket assembly as provided in the rear leaf spring suspension disclosed in Figure 3.
  • a suspension system for a commercial vehicle in accordance with the disclosed invention, comprises of, front leaf spring suspension (100), and rear leaf spring suspension (200).
  • the front leaf spring suspensions (100) (refer to Fig. 2) provided in the suspension system for a commercial vehicle (300) includes, the front suspension front hanger backet (10F), auxiliary foam spring front (20F), front spacer bracket and mounting cup assembly (23F), front mounting cup (25F), front U bolt clamp (28F), leaf spring assembly front (40F), front leaf spring clamp (45F), front U-bolt (50F), front shock absorber bottom mounting bracket (55F), front suspension rear backet (60F), front shackle plate (62F), front suspension pin (64F), and front suspension rear hanger bracket (66F).
  • the front suspension front hanger backet (10F) auxiliary foam spring front (20F), front spacer bracket and mounting cup assembly (23F), front mounting cup (25F), front U bolt clamp (28F), leaf spring assembly front (40F), front leaf spring clamp (45F), front U-bolt (50F), front shock absorber bottom mounting bracket (55F), front suspension rear backet (60F), front shackle plate
  • the front leaf spring suspensions (100) (refer to Figs. 1 and 2) are mounted on either sides of the vehicle along the front of the vehicle chassis and, at their one end through their front suspension front hanger backet (10F) that is fixed on the vehicle’s chassis and at their other end through their front suspension rear backet (60F) that are fixed at position behind the mounting position of the front suspension front hanger backet (10F) on the vehicle’s chassis.
  • a spacer (21F) and a front spacer bracket and mounting cup assembly (23F) of the front leaf spring suspension (100) that is provided with a front mounting cup (25F) are together fixed in their position on the vehicle chassis using conventional fastening means.
  • the spacer (21F) and the front spacer bracket and mounting cup assembly (23F) are so positioned on the vehicle chassis that the centre of an auxiliary foam spring front (20F) held within said front mounting cup (25F) is aligned with the centre of a front U bolt clamp (28F) of the front leaf spring suspension (100).
  • the front U bolt clamp (28F) (refer to Fig. 2) is supported on top of the leaf spring assembly front (40F) which itself rests along its lower surface on the front shock absorber bottom mounting bracket (55F) and said front U bolt clamp (28F) and the leaf spring assembly front (40F) being attached to the vehicle’s axle by means of front U-bolts (50F) and conventional nuts.
  • leaf spring assembly front (40F) is linked within the mounting point of the front suspension front hanger backet (10F) through a mounting bush
  • the other end of the leaf spring assembly front (40F) is linked with the front suspension rear backet (60F) through the front suspension rear hanger bracket (66F), the front shackle plate (62F), and the front suspension pin (64F)
  • the mounting bush being provided at the interface between the other end of the leaf spring assembly front (40F) and the front suspension rear hanger bracket (66F)
  • the front suspension pin (64F) being provided at the interface between the front shackle plate (62F) and the front suspension rear backet (60F).
  • the leaf springs together forming the leaf spring assembly front (40F) are held together by a set of front leaf spring clamps (45F) that are provided at equal distance from the longitudinal centre, and on both halves of said leaf spring assembly front (40F).
  • the front shock absorber bottom mounting bracket (55F) is itself fixed on the vehicle’s axle through conventional fastening means.
  • the front spacer bracket and mounting cup assembly (23F) (refer to Figs. 2 and 6) has a thick base that has an elongated shape made by combining two halves of a circle to two of the shorter sides of a rectangle.
  • the front mounting cup (25F) is positioned at the centre of the base of the front spacer bracket and mounting cup assembly (23F) and joined with said base by conventional joining methods including welding.
  • a circular opening is provided at the centre of the base within the front mounting cup (25F), this circular opening aligns with the central cylindrical shaped hole of the auxiliary foam spring front (20F).
  • the front mounting cup (25F) has a circular cross section which at first decreases in area until the midpoint of the height is reached and then increases in area until the topmost edge of the front mounting cup (25F) is reached.
  • the auxiliary foam spring front (20F) has the shape of a frustum that has been provided with multiple uniformly shaped depressions that form rings of reduced cross-sectional area along the height of said auxiliary foam spring front (20F).
  • the auxiliary foam spring front (20F) held within the front mounting cup (25F) has an interference fit with said front mounting cup (25F).
  • the rear leaf spring suspension (200) (refer to Fig. 3) provided in the suspension system for a commercial vehicle (300) includes, the rear suspension front hanger bracket (10R), rear auxiliary foam spring (20R), rear frame support bracket (23R), rear auxiliary foam spring bracket assembly (25R), rear U bolt clamp (28R), rear leaf spring assembly (40R), rear leaf spring clamp (45R), rear U-bolt (50R), external rubber bump stopper (57R), rear hanger bracket (60R), rear mounting plate (62R), rear suspension mounting bush (64R), and rear suspension mounting bush (66R).
  • the rear leaf spring suspensions (200) (refer to Figs 1 and 3) are mounted on either sides of the vehicle along the rear of the vehicle chassis and, at their one end through their rear suspension front hanger bracket (10R) that are fixed on the vehicle’s chassis, and at their other end through their rear hanger bracket (60R) that are fixed at position behind the mounting position of the rear suspension front hanger backet (10R) on the vehicle’s chassis.
  • a rear auxiliary foam spring (20R) is held within a rear auxiliary foam spring bracket assembly (25R) of the rear leaf spring suspension (200).
  • the rear auxiliary foam spring bracket assembly (25R) is itself attached to a rear frame support bracket (23R) through conventional fastening means.
  • the rear frame support bracket (23R) is in turn fixed on the vehicle’s chassis in a position such that the centre of the rear auxiliary foam spring (20R) is aligned with the centre of a rear U bolt clamp (28R) of the rear leaf spring suspension (200).
  • An external rubber bump stopper (57R) that is also attached on lower surface of the rear auxiliary foam spring bracket assembly (25R) is aligned with the top surface of the rear U bolt clamp (28R) of the rear leaf spring suspension (200).
  • One end of the rear leaf spring assembly (40R) (refer to Fig. 3) is linked within the mounting point of the rear suspension front hanger backet (10R) through a mounting bush, the other end of the rear leaf spring assembly (40R) is linked with the rear hanger backet (60R) through the rear suspension mounting bush (66R), the front shackle plate (62F), and rear suspension mounting bush (64R), with the rear suspension mounting bush (66R) being provided at the interface between the other end of the rear leaf spring assembly (40R) and the rear mounting plate (62R) and the rear suspension mounting bush (64R) being provided at the interface between the rear mounting plate (62R) and the rear hanger backet (60R).
  • the leaf springs together forming the rear leaf spring assembly (40R) are held together by a set of rear leaf spring clamp (45R) that are provided at equal distance from the longitudinal centre, and on both halves of said rear leaf spring assembly (40R).
  • the rear U bolt clamp (28R) supported on top the rear leaf spring assembly (40R) along the longitudinal centre of said rear leaf spring assembly (40R), are together attached and held in their position on the vehicle’s rear axle by means of rear U-bolts (50R) and conventional fastening means.
  • the rear frame support bracket (23R) (refer to Fig.
  • the rear auxiliary foam spring bracket assembly (25R) is so positioned on the vehicle chassis that the centre of the rear auxiliary foam spring (20R) held within said rear auxiliary foam spring bracket assembly (25R) is aligned with the centre of the front U bolt clamp (28R).
  • the rear auxiliary foam spring bracket assembly (25R) (refer to Figs. 3, and 8) has a thick quadrilateral shaped base whose two adjacent comers have been given a curved profile.
  • the rear auxiliary foam spring bracket assembly (25R) is provided with multiple openings in its base to allow it to be attached to lower surface of the rear frame support bracket (23R) using conventional fastening means.
  • a cup (25RC) having a cylindrical external shape is joined to the base of the rear auxiliary foam spring bracket assembly (25R) by conventional joining means.
  • This cup (25RC) has a central axis that passes through an off-centre location on the quadrilateral shaped base of said rear auxiliary foam spring bracket assembly (25R).
  • the rear auxiliary foam spring (20R) (refer to Fig. 7) has the shape of a frustum that has been provided with multiple uniformly shaped depressions that form rings of reduced cross-sectional area along the height of said auxiliary foam spring front (20R).
  • the rear auxiliary foam spring (20R) is also provided with a metallic ring (20RR) that is accommodated in one of its the uniformly shaped depressions.
  • a circular opening is provided in the base of the rear auxiliary foam spring bracket assembly (25R), this circular opening aligns with the central cylindrical shaped hole of the rear auxiliary foam spring (20R).
  • the rear auxiliary foam spring (20R) has an interference fit with the cup of said rear auxiliary foam spring bracket assembly (25R) (refer to Fig. 8).
  • the laden condition of the front leaf spring suspension (100) (refer to Fig. 5) is achieved when either the vehicle is carrying a greater load or when, while moving it has passed over a road surface irregularity.
  • the second load transmission path goes from the vehicle’s chassis to the front spacer bracket and mounting cup assembly (23F), then the front cup (25F), then the auxiliary foam spring front (20F), then the front U bolt clamp (28F), then to the centre of the leaf spring assembly front (40F), and then through the front shock absorber bottom mounting bracket (55F) to the vehicle’s axle and then through their joining components to the wheels to the ground.
  • both the auxiliary foam spring front (20F) and the leaf spring assembly front (40F) get compressed to varying degree and function to absorb the applied load and release it in accordance with their characteristics thereby giving a smoother suspension performance.
  • the vehicle can go back and forth between the laden to unladen condition (refer to Figs. 4 and 5) depending upon the loading and hence the deflection experienced by the leaf spring assembly front (40F).
  • the components present between the leaf spring assembly front (40F) and the front suspension hangar bracket (10F), and the front suspension rear bracket (60F) allow limited relative motion to accommodate bending of said leaf spring assembly front (40F) as the vehicle moves between laden and unladen condition.
  • the vehicle’s load is being transmitted from the vehicle’s chassis to the rear suspension front hanger bracket (10R) and the rear hanger bracket (60R), and then to through their intermediate joining components to the rear leaf spring assembly (40R)(with the assembly being constituted by bringing together different leaf springs using the rear leaf spring clamp (45R)) and then through the rear leaf spring assembly (40R) to the vehicle’s axle and then to through the joining components to the wheels and then to the ground.
  • the applied loads are absorbed by deflection of the rear leaf spring assembly (40R) alone.
  • the suspension’s load absorption performance is therefore determined by the performance of the rear leaf spring assembly (40R) alone.
  • the laden condition of the rear leaf spring suspension (200) (similar to condition expressed through Figure 5 for the front leaf spring suspension (200)) is achieved when either the vehicle is carrying a greater load or when, while moving it has passed over a road surface irregularity. In this condition, ordinarily only two load transmission paths exist. The first path is the same as that which has been described for the unladen condition.
  • the vehicle chassis transfers some load to the rear frame support bracket (23R), from where it is transmitted to the rear auxiliary foam spring bracket assembly (25R), then through it to the rear auxiliary foam spring (20R), then through it to the rear U bolt clamp (28R), then through it to the centre of the rear leaf spring assembly (40R) and , and then to the vehicle’s axle and then through their joining components to the wheels and then to the ground.
  • the both the rear leaf spring assembly (40R) and the rear auxiliary foam spring (20R) get compressed to varying degree and function to absorb the applied load and release it in accordance with their characteristics thereby giving a smoother suspension performance.
  • the lower surface of the external rubber bump stopper (57R) then comes into contact with the upper surface of the rear U bolt clamp (28R) and transmits the balance load directly to the centre of the rear leaf spring assembly (40R) and then through it to the vehicle’s axle and then through the joining components to the rear wheels.
  • the rubber bump stopper (57R) is very hard in comparison to the rear leaf spring assembly (40R) and the rear auxiliary foam spring (20R) and does not compress a lot. This rubber bump stopper (57R) therefore functions to prevent overloading and hence breaking of the rear leaf spring assembly (40R) and the rear auxiliary foam spring (20R).
  • the vehicle can go back and forth between the laden to unladen condition and also the extra ordinarily loading condition depending upon the loading and hence the deflection experienced by the rear leaf spring assembly (40R), and the rear auxiliary foam spring (20R).
  • the integrity of said rear auxiliary foam spring (20R) is maintained in extraordinary loading condition, thereby enhancing its overall life.
  • the components present between the rear leaf spring assembly (40R) and the rear suspension front hanger bracket (10R) and the rear hanger bracket (60R) allow limited relative motion to accommodate bending of said rear leaf spring assembly (40R) as the vehicle moves between laden, unladen condition and extreme loading condition.
  • the suspension system for a commercial vehicle (300) so described allows the vehicle designers to reduce the leaves provided in the front and rear leaf spring suspension (100, and 200) as the foam springs (20F and 20R) are also functioning to safely transmit load along the defined path to the wheels. Given that the described construction allows use of distinct combinations of springs, the suspension performance and hence the rider comfort is greatly improved.
  • the suspension system for a commercial vehicle (300) overcomes the deficiency of the conventional leaf spring suspension system that usually compromise on customer comfort in unladen and heavily laden conditions. In technical terms, the same can be noted as an observable improvement in ride frequency when the suspension system for a commercial vehicle (300) is utilised in commercial vehicles.
  • the suspension system for a commercial vehicle (300) is provided with fewer leaves in its leaf spring in the front and rear leaf spring suspension (100, and 200).
  • the suspension system (300) with fewer leaf springs, which is hence softer, should ordinarily tend to deflect more, which in turn should cause the vehicle to tilt, experience more jerks on the vehicles chassis/frame, ands experience more instability.
  • the foam springs (20F and 20R) share the load with the respective leaf springs provided in the front and rear leaf spring suspension (100, and 200) and enable suspension performance that is better than any conventional mechanical leaf spring suspension, while also reducing the suspension weight and its cost.
  • the disclosed invention can be stated to be providing the best-in-class comfort in unladen condition of the commercial vehicles, a stable ride regardless of the vehicle load, and a lighter suspension system with about 23% reduction in its cost.
  • the suspension system for a commercial vehicle (300) so disclosed achieves all the stated objectives.
  • Technical advantages offered by the invention, i.e., the suspension system for a commercial vehicle (300) are-

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vehicle Body Suspensions (AREA)

Abstract

Le système de suspension pour un véhicule utilitaire (300) selon l'invention divulguée comprend une suspension à ressort à lames avant (100) et une suspension à ressort à lames arrière (200). Les ressorts de mousse auxiliaires (20F et 20R) ont été prévus respectivement dans la suspension à ressort à lames avant et arrière (100, 200). Le système de suspension pour un véhicule utilitaire (300), ainsi divulgué, améliore le confort de conduite, augmente la durée de vie en fatigue du ressort à lames, a un coût de composant total inférieur et est plus léger, il a un meilleur comportement de NVH et des charges de pointe de ressort à lames inférieures.
PCT/IN2025/050251 2024-07-19 2025-02-20 Système de suspension pour véhicule utilitaire Pending WO2026018253A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN202421055152 2024-07-19
IN202421055152 2024-07-19

Publications (1)

Publication Number Publication Date
WO2026018253A1 true WO2026018253A1 (fr) 2026-01-22

Family

ID=98436927

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IN2025/050251 Pending WO2026018253A1 (fr) 2024-07-19 2025-02-20 Système de suspension pour véhicule utilitaire

Country Status (1)

Country Link
WO (1) WO2026018253A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4227716A (en) * 1977-12-22 1980-10-14 Saab-Scania Aktiebolag Arrangement for attaching spring assemblies to vehicle axle housings
US10919354B2 (en) * 2017-03-20 2021-02-16 Reyco Granning, Llc Tandem suspension system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4227716A (en) * 1977-12-22 1980-10-14 Saab-Scania Aktiebolag Arrangement for attaching spring assemblies to vehicle axle housings
US10919354B2 (en) * 2017-03-20 2021-02-16 Reyco Granning, Llc Tandem suspension system

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