Light weight center stand for two wheeler vehicle

Abstract

Present invention discloses a light weight center stand(100) for two wheeler vehicle with improved strength and durability, weight is reduced by providing curved profiling / corrugation of particular pitch on several parts created using die with said profile in cold forging process. The center stand(100) consists corrugated right and left main tubes(101&102), reinforcement main pipes(118&119), upper and lower bridge tube(103&104), corrugated bushes(105&106), bracket grommet holder(107) of reduced size and right and left upper stoppers(113) manufactured using cold rolled sheet, shoe plates(108) of reduced size, reinforcement tread bar(112), tread bar(109), split pin(110) and spring hook tread bar(111). It further includes stopper and bracket tread bar(114&115), pivot pin tread bar(116), tread bar foot plate(117) and rubber grommet(120). The said technical modifications reduces 14-15% weight and cost of the center stand. The profiled main pipe has 42% and profiled thread bar has 50% more bending strength and can withstand internal pressure of 150MPa.

Description

[0001] LIGHT WEIGHT CENTER STAND FOR TWO WHEELER VEHICLE

[0002] FIELD OF INVENTION

[0003] The invention generally relates to the field of Automobile Engineering. More specifically it pertains to a light weight center stand for two wheeler particularly scooters / motorcycle.

[0004] BACKGROUND OF THE INVENTION

[0005] The following background includes information which is important for the better understanding of the present invention. Before proceeding into the details of present invention, some important definitions are as below:

[0006] Hot rolled steel: Hot rolled steel is steel that has been roll-pressed at very high temperatures of about l,700°F, which is above the re-crystallization temperature for most steels. (https: / / www.reliance-foundry.com / blog / hot-vs-cold-rolled-steel)

[0007] Cold rolled steel: Cold rolled steel is actually a hot rolled steel, which undergoes further process, once the hot rolled steel is cooled down, it is re-rolled at room temperature to achieve better dimensions, mechanical and surface qualities, which results in the formation of cold rolled steel. Cold rolled sheets undergo compression between the rollers. (https: / / www. reliance- found ry.com / blog / hot-vs-cold-rolled-steel)

[0008] Hot forging: Hot forging is a metal shaping process, in which malleable part of metal undergoes shaping processes such hammering, upsetting, pressing, and so forth where the work piece is heated up to about 75% of its melting temperature to get a desired shape, (sciencedirect) Corrugation of metal sheets: Metal corrugation is a unique roll-formed process whereby a precise and specific repetitive surface pattern is achieved over sheet metal or wire. Corrugated metal sheet is defined as any type of sheet steel, which is strengthened for use in construction by having a series of alternating grooves and ridges forced into it. Corrugation process is carried out by roll forming process. Corrugation process starts with steel sheets, which then pressed into three dimensional patterns known as corrugation using series of rollers in cold roll forming process, particularly different types of die arrangements are used for different types of corrugations. The sheet metal is pulled off from huge rolls and dies, forming corrugations. Traditionally, the corrugations are round wavy in shape, however, currently different types of dies are being used for different types of corrugation. The corrugations are described in terms of pitch (the distance between two crests) and depth (the height from the top of a crest to the bottom of a trough).

[0009] Center stand assembly in two wheeler

[0010] Two wheeler vehicle i.e., motorcycle and scooter are essentially provided with a parking stand facilitating parking of the two wheeler vehicle. The vehicle is provided with two types of stands i.e., a side stand, which is preferred for quick and easy parking of vehicle for shorter time duration and the same is located between the wheels centers and a center stand assembly located between two wheels or at rear axle of the wheel_facilitating parking of two wheeler in more stable and static configuration allowing the parking for longer time durations. 'Center stand' means a stand which, when swung into the position of use, supports the vehicle by providing one or more areas of contact between the vehicle and the ground on both sides of the longitudinal median plane of the vehicle. Center stand is best for parking on uneven or soft terrain and act as a pair of supports that flip downward, lifting the rear wheel from the ground. Center stand is more preferable over side stand, as in side stand the stability of the standing vehicle is under question, whereas, when the vehicle is parked using center stand, then the vehicle attains a more stable configuration and is standing in upright position instead of inclined position, thus the chances of falling of the vehicle are very rare, further, the use of side stand results in development of fatigue in stand, increases the chances of accident, requires more parking space and reduces the battery life, thus center stand is preferred more over the side stand assembly.

[0011] Present invention is confined to center stand for two wheeler vehicle.

[0012] Problems in Center stand assembly

[0013] The center stand must be strong enough to handle the weight of the overall vehicle and must be stable and durable to support the vehicle standing in upright position, however, high strength center stands are quite heavier in size, which increases the weight of the overall vehicle. Heavier the two wheeler vehicle, lower is its efficiency and performance. Thus center stands are uncommon in bigger high performance two wheelers in order to save weight and increase its ground clearance.

[0014] Further, despite having numerous benefits of center stand, most of the riders choose to park the vehicle using side stand only as they find center stand more challenging than the side stand because parking the vehicle using center stand require a lot of human effort, particularly due to the heavy weight of the center stand and overall vehicle. The scooters are mostly driven by females, elderly people and youngsters who find it difficult to apply the center stand as while using the center stand, the rider has to pull 50% vehicle's weight. It is more common to see center stands on lighter vehicles because deploying a center stand requires the user to lift the vehicle up while using the contact points of the stand as a pivot, thus because of the heavier center stand, the overall size of the vehicle increases and the heavier vehicles are difficult to maneuver as a lot of strength is required to pull the vehicle and apply the center stand.

[0015] Thus, to address the aforementioned drawbacks, the weight of the center stand should be reduced, in order to reduce the overall weight of the two wheeler and to improve and enhance its performance. Further, the weight of the center stand should be less so that any person of any age group can easily apply it without any extra efforts, hassle and discomfort. Lesser the weight of the center stand, lesser will the weight of the vehicle and thus higher will the comfort, performance and efficiency. Thus reducing the weight of center stand hugely impacts the weight of the overall vehicle and thus improves the overall handling of the vehicle.

[0016] Currently, there are variety of center stands are available, in which the no. of parts are reduced to decrease the weight, however reducing number of parts is not a reliable solution as due to less parts, strength and stability will come under question. Further, to overcome the drawbacks of heavy weight center stands and in order to provide ease in applying the same, automatic center stands with variety of sensors are currently available, however the same are less suitable as automatic stands are equipped with several sensors and other parts, which increases the overall cost of the stand and also the life of these stands is also average, thus existence of automatic stand also fails to provide a solution.

[0017] Hence, there was an immense need to manufacture low cost and light weight center stands with enhanced strength, stability and durability. Present invention is thus confined to disclosure of light weight center stand assembly.

[0018] Innovative approach by Present invention

[0019] In order to address the problems associated with heavy weight center stand assemblies, the inventors of present invention innovatively modified / altered the design of the center stand assemblies and manufacturing process used for manufacturing the same. The technical modifications and improvements are carried out such as corrugating the bushes, creating profiles / splines in tubes, reducing the size of shoe plates and changing the design of brackets etc, which results in reduction of the weight of overall center stand assembly and cost reduction, without compromising the strength and durability of the same. Present invention is not anticipated by prior art patents and non-patents literature, however related prior art is as below: Prior art patents

[0020] Indian Patent Application No: 433 / CHE / 2007 discloses "A center stand for a two wheeler motor vehicle"

[0021] Cited patent discloses a center stand for two wheeler vehicle with reduced working parts rendering the structure of center stand simpler and efficient. The center stand includes a tension spring provided for the lever to enable the center stand and lever to revert from a working position to a position of rest, pivotable cam having profile butting against stop restricting the rotation of lever to a predetermined angle on rotation of the lever towards the working position and a hook welded on the pivotable cam to serve as an anchor for the tension spring. The light weight center stand with corrugated bushes and brackets as disclosed in present invention is not disclosed in above cited patent, thus present invention differs from above cited patent.

[0022] Indian Patent Application No. 3652 / MUM / 2012 discloses "Integrated side stand and central stand assembly for two-wheeler"

[0023] The above cited patent discloses a central cum side two wheeler stand assembly comprising a main shaft, a central stand sub assembly with angled leg element, a latching arm and latching arrangement. The central stand assembly is functionally coupled to the main shaft and angled leg element is pivotally mounted to main shaft and latching arm and latching arrangement is adapted to detachably receive a side stand leg sub assembly. The above cited patent fails to disclose center stand assembly with corrugated bushes and brackets and further, the mechanism of reducing weight as disclosed in present invention is nowhere disclosed in above cited invention. Thus, both the patents differs from each other.

[0024] Patent Application No. JPH0516850A discloses "Auxiliary stand of two wheeler" The above cited patent discloses a stand for two wheeler comprising main stand body consisting of pair of right and left frame with L side shape and having curved bent portions and a boss portion located on same axis. It consists pair of U shaped brackets with plurality of circumferential grooves on peripheral surface of shaft and pair of L shaped brackets each having circumferential groove and side shaped L-shaped receiving portion at one end, T shaped shaft having handle at one end and a roller assembly used in combination with bracket and its mounting bolt. U shaped brackets based stand assembly is disclosed in above cited patent, however, corrugate bush and brackets based assembly to reduce the weight of the main stand is not disclosed in cited patent, thus the same differs from present invention.

[0025] Patent Application No. WO2014 / 195964A2 discloses "Center stand for two wheelers"

[0026] The aforementioned patent discloses a center stand consisting of support brackets secured to chassis and supporting actuator mechanism i.e., hydraulic piston cylinder mechanism, a base stand, a resting mechanism, a load bearing mechanism and a spring mechanism. Further, it is equipped with rotating block with pair of bushings interacting with the pairs of rods disposed on base stand to bring base stand in parking position and facilitating unfold configuration of stand facilitated by the actuator mechanism. The above cited patent fails to disclose center stand assembly with corrugated bushes and brackets and further, the mechanism of reducing weight as disclosed in present invention is nowhere disclosed in above cited invention. Thus, both the patents differs from each other.

[0027] Indian Patent application no. 202241050895 discloses "Center stand assembly for a vehicle"

[0028] The above cited patent discloses a center stand assembly comprising plurality of members consisting of pair of main legs, center bridge bar connecting and joining left leg to the right leg, a lever member for opening center stand assembly by user between ON stand and OFF stand position, pair of legs further have a pivot portion being pivotably connected to powertrain casing of the vehicle, stopper portion near pivot portions contacting support portion on powertrain casing, boot portion contacting ground during ON-stand position and spring for snapping center stand assembly between ON and OFF position. Present invention disclosed corrugated bushes to enhance the strength and reduce the weight of the assembly, such mechanism is nowhere disclosed in above cited patent. Thus, present invention differs from the above cited patent. Indian Patent application no. 202121062183 discloses "Self-Balancing Automated Center Stand for Two Wheeler"

[0029] A self-balancing automated center stand (100) for two wheeler including at least two frames and an actuator. The stand is attached to the main frame and the primary frame. The actuator is operated on battery. When a force is applied to the actuator through a toggle switch, if the two wheeler is on an uneven ground surface, then a side of the stand with a first supporting arm which high in length strikes the uneven ground surface first. A meshing box in the main frame slides to an opposite side gradually when the force is applied, wherein the meshing box comprises at least two racks.

[0030] The above cited patent is not relevant to present invention.

[0031] Indian Patent application no. 202221053285 discloses "Automatic center stand for two wheeler vehicles"

[0032] An automatic center stand for two wheeler vehicles is consisting of a base plate assembly fastened to a double acting actuator assembly, a 4 / 3 way direction control valve, a hydraulic gear pump, a PMDC motor, a control unit, a 12v DC Battery, a digital display and a displacement measurement sensor. The base plate assembly consisting of a base plate, a pair of clamps, a cantilever leg mounting, a support leg, an inclined leg along with a flat end can stand the vehicle on flat, inclined, irregular, pebble and pothole surfaces. Its operation is automated by means of a digital display and a control unit. Occupies fewer parking space.

[0033] The above cited patent is not relevant to present invention.

[0034] Indian Patent application no. 202311080806 discloses "Smart stand for two-wheeler vehicle"

[0035] A smart two wheeler stand consisting of magnetic sensors on the stand and on chassis of the vehicle. Further, it comprises controller linked to 2ndmagnetic sensor and igniter to receive ignition signals and permits the engine to activate only when the stand is in upright position. The above cited patent is not relevant to present invention.

[0036] Patent Application No. W02008087659A1 discloses "Automatic two wheeler stand"

[0037] The above cited patent discloses an automatic two wheeler stand which uses a DC motor and a hydraulic pump, coupled together with the help of a distributing manifold and having a reserve oil tank forming a power pack. This system helps to unfold the legs (41A, 41B) of the two wheeler stand from the horizontal position to the vertical position and to push open the assembly on which the legs are mounted with the' help of a hydraulic cylinder or any other, means such as a pneumatic cylinder or a motorized actuator or a hydraulic pneumatically operated cylinder, up to the pre-set height which lifts the two wheeler and parks it on the stand automatically. The hydraulic assembly based center stand as disclosed in above cited patent is not mentioned in present invention, making present invention different from cited patent.

[0038] Piyush Choudhary, et.al; Design and analysis of effortless center stand for two-wheeler; Journal of Engineering technologies and Innovative research; September 2020; volume 7, Issue 9

[0039] The above cited research article discloses an automatic center stand consisting of pneumatic cylinder hopped up by mechanical device and controlled by key operated switch. The equipment will provide result just by actuating the center stand using linear actuator operated by compressor. The disclosed stand can lift load of 2300N without failure, which is equivalent to 2 persons seating. Center stand assembly with corrugated bushes and brackets as disclosed in present invention is not disclosed in above cited center stand, thus present invention differs from cited document.

[0040] Ankit Kumar K Shriwas, et.al; Design and analysis of standing device for two wheeler; International Engineering Research Journal; Page No. 361- 371

[0041] The above cited research article discloses a center stand optimized by changing design so that lower stresses are generated within the material and that design of center stand is easy to operate. The center stand is equipped with arm connecting rods of length 300mm and diameter 20mm, arm thickness 15mm, width 22mm and length 230 and 250mm, bottom curve thickness 15mm and width 35mm. The standing device is made using aluminum alloy LM4 with heat treatment and it also maintains weight of standing device within range of normal conventional main stand weight. Analytically, the device is safe to use and can sustain described load of 1400N. The disclosed stand is easy to actuate and does not require lever pull. However, the design of center stand with corrugated bushes and brackets as disclosed in present invention is not disclosed anywhere in above cited article.

[0042] Kiran Mukund; Design, analysis and fabrication of automated center stand for two wheeler; GRD Journal for Engineering; Volume 3; Issue 11; October 2018 The above cited article discloses a center stand modified using electronic and mechanical components. The disclosed center stand comprises of a base frame, DC motor, solenoid valves and links. The model is fabricated using steel as raw material and fixed in bike to determine the effectiveness of the same. When the switch is turned on, the linear actuator pivoted at center of the stand activates and pushes the stand downwards, when the stand touch the ground, it is not possible for the bike to move further, thus gets lifted gradually. The fabricated design has maximum deformation of 5.10mm, max equivalent strength of 1560 MPa and minimum safety factor of 0.355.

[0043] The corrugated bushes and brackets based center assembly as disclosed in above cited article is nowhere mentioned in cited article, making it different from present invention.

[0044] Patented Effortless E-Z center stand: TVS Jupiter booklet

[0045] The effortless E-Z center stand (1) comprises a pivoted flexible spring loaded lever arm (Stand extension) (2) to increase lever ratio enabling parking on center stand effortlessly and conveniently. In order to place the vehicle on center stand, the user hold the handle bar left grip with left handle, place foot firmly on center stand extension and press.

[0046] Center stand assembly with corrugated bushes and brackets as disclosed in present invention is not disclosed in above cited center stand, thus present invention differs from cited document.

[0047] OBJECT OF THE PRESENT INVENTION

[0048] The primary object of the present invention is to disclose a light weight center stand assembly for two wheeler vehicle without compromising the strength and durability of the same.

[0049] Another object of the present invention is to disclose a light weight center stand assembly weight of which is reduced upto 14-15%.

[0050] One more object of the present invention is to disclose a center stand assembly which is lower in cost.

[0051] SUMMARY OF THE INVENTION

[0052] Present invention discloses a light weight center stand assembly for two wheeler vehicle with improved strength, stability and durability. The weight of the said center stand assembly is reduced by altering the design and size of several parts by way of some technical modifications mainly curved profiling / corrugation. The disclosed center stand assembly (100) consists of corrugated right and left main tubes(101&102), reinforcement main pipes(118&119), upper and lower bridge tube(103&104), corrugated bushes(105&106), bracket grommet holder(107) of reduced size and right and left upper stoppers(113) manufactured using cold rolled sheet, shoe plates(108) of reduced size, reinforcement tread bar(112), tread bar(109), split pin(llO) and spring hook tread bar(lll). It further includes stopper and bracket tread bar(114&115), pivot pin tread bar(116), tread bar foot plate(117) and rubber grommet(120). The said technical modifications reduces 14-15% weight and cost of the center stand. The profiled main pipe has 42% and profiled thread bar has 50% more bending strength and can withstand internal pressure of 150MPa. The profiling / corrugation and splining is created by a machine comprising a die having die case with the profile used for making parts of said center stand during cold forging process.

[0053] The profiling / corrugation / splining is created by the existing machine used for making parts of center stand during cold forging process as the machine comprises a die having die case with the profile, which needs to be crafted over the specific parts of the center stand. The corrugated parts are further attached / joined by the process of welding to manufacture the complete center stand assembly.

[0054] DESCRIPTION OF FIGURES-

[0055] Figure 1 to 5 prior art figures

[0056] Figure 6 Front view of the center stand assembly

[0057] Figure 7(a) and (b) Perspective view of center stand assembly

[0058] Figure 8 Top view of center stand assembly Figure 9 Side view of center stand assembly Numbering details

[0059] (101) Right main pipe

[0060] (102) Left main pipe

[0061] (103) Bridge pipe upper

[0062] (104) Bridge pipe lower

[0063] (105) Left bush (106) Right bush

[0064] (107) Bracket grommet holder

[0065] (108) Shoe tread plates RH & LH

[0066] (109) Tread bar

[0067] (110) Split pin

[0068] (111) Spring Hook tread bar

[0069] (112) Reinforcement tread bar

[0070] (113) Upper stopper RH & LH

[0071] (114) Stopper tread bar

[0072] (115) Bracket tread bar

[0073] (116) Pivot pin tread bar

[0074] (117) Tread bar foot plate

[0075] (118) Reinforcement main pipe Left

[0076] (119) Reinforcement main pipe right

[0077] (120) Rubber Grommet

[0078] Figure 10- Figure showing overall dimension of centre stand assembly (100)

[0079] Figure 11- Drawing of bush assembly (105 & 106)

[0080] Figure 12- (a) Drawing of right main pipe (101) and (b) left main pipe (102)

[0081] Figure 13- Drawing of bridge pipe upper (103)

[0082] Figure 14- Drawing of bridge pipe lower (104)

[0083] Figure 15- Drawing of Bracket Grommet holder (107)

[0084] Figure 16- Drawing of Shoe tread plate (108)

[0085] Figure 17- Drawing of Tread bar (109)

[0086] Figure 18- Drawing of Split pin (110)

[0087] Figure 19- Drawing of spring hook tread bar (111)

[0088] Figure 20- Drawing of reinforcement tread bar (112)

[0089] Figure 21- Drawing of upper stopper right and left (113)

[0090] Figure 22-Drawing of stopper tread bar (114)

[0091] Figure 23 - Drawing of bracket tread bar (115) Figure 24 - Drawing of Pivot pin tread bar (116)

[0092] Figure 25- Drawing of tread bar foot plate (117)

[0093] Figure 26- Drawing of (a) reinforcement main pipe (RH) (118) and (b) reinforcement main pipe (LH) (119)

[0094] Figure 27- Drawing of rubber grommet (120)

[0095] Figure 28- Bending test results for main pipe (101 & 102)

[0096] Figure 29- Bending test results for tread bar (109)

[0097] Figure 30- Tensile strength and bending test results for bridge pipe (103)

[0098] The light weight centre stand assembly for motorcycle is now disclosed in detail with reference to the accompanying drawings.

[0099] DETAILED DESCRIPTION OF THE INVENTION

[0100] The present invention discloses a light weight center stand assembly (100) for two wheeler vehicle particularly scooters. The weight of the center stand assembly in present invention is reduced by altering the design, shape of few parts and changing the raw material used for manufacturing such parts. Such technical modifications not only reduce the weight of center stand assembly, but also enhance the strength, stability and durability of the same. In present invention, the weight of the center stand assembly for scooters is reduced upto 14-15% in contrast to the commercially existing center stand assemblies.

[0101] Bushings are akin to thin tubes most commonly used for machinery with rotating or sliding shafts to improve efficiency and reduce vibration and noise. So modification and improvements in profile of the bush with particular pitch and depth is a major modification in the present invention.

[0102] Constructional Features of the present invention:

[0103] As shown in figure 6 and 7 the center stand assembly (100) as disclosed in present invention consists of splined right and left main pipe (101) & (102), reinforced main pipe left and right (118) and (119), Bridge pipe upper and lower (103) & (104) connecting the right and left arms to each other, corrugated right and left bush assembly (105) & (106), bracket grommet holder (107), shoe tread plate (RH) and (LH) (108), tread bar (109), split pin (110), Spring hook tread bar (111), Reinforcement tread bar (112), Upper stopper RH & LH (113), Stopper tread bar (114), Bracket tread bar (115), pivot pin tread bar (116), tread bar foot plate (117) and rubber grommet (120). The dimensions of the overall center stand assembly (Figure 10) are as follows:

[0104] Table 1 Showing dimensions of centre stand assembly

[0105] Some technical modifications and improvements are done in the disclosed center stand in order to reduce the weight and improve several characteristics such as strength, durability and stability of the same. The technical modifications by way of corresponding figure 6 and 7(a) & (b) are detailed below for thorough understanding of the present invention.

[0106] Referring to Figure 6 and Figure 7(a) & (b)

[0107] Figure 6 and 7(a) & (b) of the present invention particularly discloses front view and perspective view of the center stand assembly respectively. The disclosed center stand assembly (100) consists of:

[0108] Vertical right and left main pipes (101) & (102) splined at the outer diameter i.e., characterized by deep grooves or splines at outer diameter, in order to enhance the strength of the center stand. The length of the main pipe is 241.5±0.5mm with outer diameter (OD) 19mm, wall thickness 1.6mm, drain hole of 4mm diameter and bend angle of 16°. The profiling over the surface of the main pipe results in formation of outer groves of radius 2mm and width 2.76mm at 6 places and inner curves of radius 0.5mm and width 2.72mm at 6 places, which results in reduction of wall thickness of the pipe and thus contributes to overall weight reduction as well. (Figure 12(a) and (b)) The main pipe also possess reinforcement at the upper part (118) & (119) for weight reduction; Bridge pipe upper (103) of 242.4±0.5mm length, bends at both ends at angle 132°. The outer diameter (OD) of the pipe is 12.7mm with wall thickness of 1.4mm and near the bend, the inner side radius is 13.65mm and radius at the other end is 26.35mm. (Figure 13)

[0109] Bridge pipe lower (104) of length 251±0.5mm bends at both ends at angle 10°. The pipe has the outer diameter (OD) of 12.7mm, radius 150mm and wall thickness 1.4mm. (Figure 14)

[0110] Corrugated right and left bush assembly (105) & (106), having curved profiling / corrugation is created over the bushes in order to reduce the weight of the disclosed center stand assembly. The curved profiling creates external grooves, internal bore and chamfered ends, forming a crest and trough like structure. The crest has a radius of 2mm and the same is at 16 places and the trough has a radius 1.5mm and is available at 8 places and distance between each trough is 8.3mm, further the length of the bush is 30±0.1mm, outer diameter of the bush (105) and (106) is 18mm and inner diameter of same is 10.6mm with 1x45° chamfered angle at both sides (figure 11).

[0111] Bracket grommet holder (107) of reduced size, manufactured using cold rolled steel sheet by sheet forming process. It has total length of 36.8mm, width 26±0.2mm and wall thickness 2mm. Further, it is equipped with a hole of diameter 10.5±0.1mm and radius 13mm and there is an L shaped curve of width 7mm and length 36.8mm (Figure 15);

[0112] Shoe tread plate (RH) & (LH) (108) of reduced size in order to lower down the weight of the center stand assembly. The show tread plate has a total length of 40.3mm, width 32±0.5mm and hole for nut placement of diameter 6mm. Further it has curved surface having length 18.5±0.5mm and width 17±0.5mm, different radius which is bent from the main plate at an angle of 42° (Figure 16);

[0113] Tread bar (109) with spring attachment to apply the center stand. The total length of the tread bar is 196.9±0.5, Outer diameter (OD) 15.9mm, wall thickness 1.6mm. The straight part is of 144.2±0.5 length, after which the tube is bent at bend angle 124° having radius 41.9mm at inner side of the curve and bend angle 56° at the outer side and total width of the bent / curved part is 77.8±0.5mm. Further due to corrugation over the surface of the tread bar, outer grooves of radius 2mm and width 1.84mm are formed at the outer part and inner grooves of radius 0.5mm and width 1.92mm, which contributes to weight reduction of centre stand assembly. (Figure 17)

[0114] Split pin (110) of length 27mm, outer diameter 3mm and hole of diameter 6.8mm. (Figure 18)

[0115] Spring hook tread bar (111) i.e., a hook like structure with bent profile instead of U shape as present in existing assemblies. It has a total length of 36mm, width of 19.4±0.2mm and thickness of 2.6mm. The radius of the corner fillet is 2mm and it has a hole of diameter 10±0.2mm. The bent section is an angle 10° and further, the radius of the hook is 2mm, flat edge is 5.9mm and at complex curvatures, the radius are 1mm, 2mm, 2.5mm and 3mm. (Figure 19)

[0116] Reinforcement tread bar (112) of length 50mm, width of one end 8mm and other end 3mm and thickness on 3mm (Figure 20)

[0117] Upper stopper Right and left (113) having bent profile on both the side. The assembly is of width 10±0.2mm, wall thickness 2mm, bent radius 3mm and length 18mm. The stoppers are manufactured using cold rolled steel sheet instead of square wire (Figure 21)

[0118] Stopper tread bar (114) of length of top part 31.2±0.2mm, length of bottom part 29±0.2mm, wall thickness 6mm and curved surface at one end with radius 1.5mm (Figure 22)

[0119] Bracket tread bar (115) of length 35.2±0.2mm, width 31.6±0.2mm. It further consists a hole for nut placement of diameter 10+0.1mm and bent at bend angle 8°. The design of the same is changed for weight reduction. (Figure 23)

[0120] Pivot pin tread bar (116) Having total length 43±0.2mm, it is divided into three portion, first portion of length 7.2mm and chamfer end at angle 1x45°, centre portion of length 14.8±0.1mm, end portion of length 15.5±0.1mm with hole of diameter 3.5±0.1mm with chamfer angle 1x45° and outer diameter 12±0.1mm. The design of the same is changed for weight reduction. (Figure 24)

[0121] Tread bar foot plate (117) having overall length 37 ± 0.5 mm, overall width 34 mm, Height (arc rise) 8.75 ± 0.5 mm, Vertical height (side view): 28 ± 0.5 mm, wall thickness 2mm. The top the foot plate shows parallel ribs or grooves (anti-slip lines) having 6 ribs are spaced evenly. It further has cross-sectional curvature of radius 8mm, rib height 0.65mm, rib spacing and small fillets at radius 0.25 and 0.63mm. It is manufactured using CRC-G1 (Cold Rolled Close Annealed Steel, Grade Gl). The design of the same is changed for weight reduction. (Figure 25)

[0122] Reinforcement main pipe (L) & (R) (118 & 119) having overall length 122.5 ± 0.5 mm, width at wide end 22.9 mm, wall thickness 2.3 mm, chamfer at 5 x 45° at the right side for ease insertion and multiple outer radius of 20mm throughout the curvature. The top view of same discloses a curved profile with controlled radius to allow smooth force distribution and internal pocket or cutout region (central narrowing area) for weight reduction or interface with another part, series of R20 outer fillets contribute to structural strength and Hole or slot width dimensioned as 22.9 mm. It further has rounded ends: R1 and R2.5 with an angle of 30° on the left. Figure 26 (a) and (b)

[0123] Rubber grommet (120) of overall height 25 ± 1.0 mm, Bottom diameter 22 ± 0.5 mm, top diameter hole of diameter 11.5 ± 0.1 mm, neck diameter of 10 mm, chamfer angle 89° and top thickness 2mm. (Figure 27)

[0124] This is to specify herewith that the dimensions of the parts will vary as per the design of the scooter / motor cycle, where the centre stand is to be used / employed.

[0125] To summarize, the key changes in various parts of center stand assembly w.r.t existing are as below:

[0126] Table 2: Key changes in various parts of centre stand assembly

[0127] The aforementioned technical modifications and improvements by way of corrugation, curved profiling, splining, shape modifications, design alterations and raw material alterations etc have reduced the weight of the center stand assembly (100) by 14-15% and reduction is weight by way of raw material used in 12.4% and there is cost reduction.

[0128] The inner-connectivity between all the parts is as follows:

[0129] The right main pipe (101) and left main pipe (102) forms the vertical side supports and are reinforced by reinforcement main pipe right (119) and reinforcement main pipe left (118). The bridge pipe upper connects the top portions of the main pipe, held in place by left bush (105) and right bush (106) mounted / located at top of main pipes. Bridge pipe lower (104) spans between lower parts of the main pipe to enhance horizontal stability.

[0130] Further, the shoe tread plates RH and LH are fixed at the base of (101) and (102) to ensure firm ground contact and stability. These tread plates are the resting foundation of the structure. The tread bar (109) act as a foot bar mounted to main tube with bracket tread bar (115), tread bar foot plate is located at the front of the tread bar for foot placement and reinforcement tread bar (112) connected to tread bar (109) provides additional strength and stiffness to (109). Pivot pin tread bar (116) connects tread bar (109) assembly to frame allowing rotational movement. Stopper tread bar (114) limits the movement of the tread bar to prevent over rotation. Bracket tread bar (115) is part of linkage connecting with tread bar with the main frame and spring hook tread bar (111) is connected between main frame and tread bar to restore tread bar's position after use and the split pin (110) located at tread bar (109) secured the pivoting parts in place and avoids disengagement. Further, supporting parts like bracket grommet holder (107) holds rubber grommet (120), which might cushion vibrations or facilitate wire / cable routing and upper stopper RH & LH are mounted on reinforcement main pipe (118 & 119) and likely used to restrict or stop upward movement of the vertical pipes.

[0131] Manufacturing process

[0132] The sheet based components for centre stand assembly, including spring hook tread bar (111), tread bar foot plate (117), upper and lower stoppers (113), reinforcement tread bar (112), shoe tread plates (L & R) (108), bracket grommet holder (107), and reinforcement pipes (L & R) (118 and 119) are manufactured using cold rolled steel (CRS) sheets. CRS is selected for its excellent dimensional accuracy, enhanced mechanical strength, and superior surface finish, which are critical for parts requiring precise fit and reliable performance. The stopper tread bar (114) is produced using hot rolled steel sheets, which, also contribute to weight reduction.

[0133] The manufacturing process for sheet-based parts involves the following stages:

[0134] Blanking or cutting: Cold rolled or hot rolled steel sheets of appropriate thickness are first cut into pre-defined shapes and sizes using blanking dies.

[0135] Pressing / Forming: The cut blanks are the subjected to pressing operations in pressing machine using appropriate dies. The pressing operations include bending to form angular shapes, deep drawing for deeper recessed geometries, piercing / punching for holes / slots and apertures formations.

[0136] Trimming and Deburring: Post-pressing, the components are trimmed to remove excess material and deburred to eliminate sharp edges or burrs resulting from the forming operations. Manufacturing of corrugated parts

[0137] The main corrugated tubes (101) and (102) and plain upper and lower bridge tubes (103 and 104) and bushes (105) and (106) are manufactured using the process as below:

[0138] Cold forging: Cold forging is a process, where the work piece is placed between dies of specific radius and profiling, so that the metal work piece attains a desired shape. Cold forging process starts by selecting large sheet of raw material particularly aluminum or steel, which is further cut into the length of the required size as per the requirement. Further, using special tooling, the sheet is cold forged into the right shape. At this step, the steel / aluminum is molded at room temperature, by forcing the raw material through a series of dies at high pressure.

[0139] Profiling: Further, the profiling is created by analyzing the strength of all the parts, generating die casing having said profile and placing die casing in machine and crafting profile. Creating the profile over metal during cold forging process by passing a annealed metal through die casing having profile;

[0140] Welding: The profiled parts are further welded to obtain complete center stand assembly.

[0141] Simulation results:

[0142] The simulation analysis of plain main tube, profiled main tube, plain thread bar, profiled thread bar and plain bridge pipe having 1.6 THK and 1.4THK was analyzed for determination of tensile strength, bending strength and how much pressure such tubes can withstand by performing tensile strength test, bending test and flattening test. Further the results obtained for profiled tubes are also compared with plain tubes, to determine the superiority or profiled structures over the plain structures.

[0143] The plain and profiled main tube, thread bar and plain bridge pipe of variable thickness made of CDS_2 i.e., cold drawn steel material of density 7.85e-06 Kg / mm3and yield strength of 154 MPa undergoes bending test and flattening tests, to determine their strength and other properties. Both the tests analyze the load / pressure applied, von mises stress and maximum displacement.

[0144] Load applied / failure load is the intentional external force / pressure applied on tube until the tube deform to determine the strength of the same. Von mises stress is the calculated value representing overall stress within material, it should be equals to yield strength, as higher variations indicates chances of permanent failure or deformations.

[0145] Maximum displacement is the amount of tube deforms from its original place due to applied load.

[0146] Simulation analysis of Main pipe (101) & (102): The results for main tube simulation analysis are as follows:

[0147] Bending test of plain and profiled main pipe:

[0148] Table 3: Bending results for plain and profiled main tube

[0149] From above table, it was concluded that profiled tube withstand higher load of 100N, indicating higher load bearing capacity, suggesting enhanced structural strength due to profiling. Further, profiled tube is better optimized in terms of stress distribution. Thereby, it is concluded that, Profile pipe has 42 % more bending strength as compared with plain pipe.

[0150] Flattening test of profiled pipe: Flattening tests are only applicable for profiled surface and not for plain surfaces, thus flattening analysis of only profiled main pipe was conducted.

[0151] Table 4: Results for flattening test of profiled pipe

[0152] From table 4 above, it is concluded that the profiled pipe can withstand an internal pressure of ISOMPa before reaching von mises stress of 160 MPa, indicating good comprehensive strength and further very small deformation of 0.00154 indicates good stiffness under high pressure. Simulation analysis for thread bar (109): The simulation results for plain and profiled thread bar are as follows:

[0153] Bending test for plain and profiled tread bar:

[0154] The profiled thread bar withstands 90 N load, while plain bar only handles 60N load, thus the profiling enhances the structural efficiency under bending loads. Thus, the profiled thread bar has 50% more bending strength, while maintaining same stress level as compared to the plain tread bar.

[0155] Flattening test for profiled tread bar:

[0156] From table 6 above, it was concluded that the maximum displacement is very small, indicating excellent resistance to deformation under load. The profiled tread bar (109) demonstrates high stiffness and structural stability. The low displacement and modest stress levels indicate that the bar has not undergone any significant deformation and can be expected to perform well under service loads. Thus, the flattening test confirms that profiled tread bar (109) can withstand high compressive loads with minimal deformation. The bar exhibits excellent mechanical behavior, making it suitable for applications requiring high structural reliability.

[0157] Simulation analysis of plain bridge pipe (103):

[0158] The tensile strength and bending strength of plain bridge tube having thickness 1.6 and plain bridge tube having thickness 1.4 are analyzed and compared with each other. Both the tubes are made using ERW-1 i.e., Electric resistance welded steel tube having density 7.85e-06 Kg / mm3and yield strength 160MPa.

[0159] Tensile strength: The tensile strength results for plain bridge tube 1.6 thickness and plain bridge tube 1.4 thickness are as follows:

[0160] Table 7: Tensile strength test for plain bridge tube of 1.6 and 1.4 THK

[0161] From above table, it was concluded that plain bridge tube with 1.6 mm thickness withstood higher load prior to its failure, indicating better load bearing capacity. The plain bridge pipe 1.6 THK has a tensile strength of 1.2 times as compared to plain bridge tube 1.4 THK.

[0162] Bending test: The bending strength results for plain bridge tube 1.6 thickness and plain bridge tube 1.4 thickness are as follows:

[0163] Table 8: Bending strength test for plain bridge tube of 1.6 and 1.4 THK

[0164] From table 8, it is concluded 1.6mm thick tube could withstand a higher bending load, handing 25% more load which reflects greater resistance to bending. This indicates that plain pipe 1.6 has 25% more bending strength as compared to plain bridge pipe 1.4.

[0165] Technical modifications / improvements done is center stand assembly are splining the arm assemblies, reducing the size of brackets and shoe plates, curved profiling / corrugation of bushes, modifying the shapes of brackets and grey part, replacing the raw material for manufacturing of several parts etc. This said technical modifications not only reduces the weight of the center stand assembly but also improves the strength, stability and durability of the same.

[0166] Novelty of the present invention is duly clear as per the non-disclosure of above features in the prior art patent and other non-patent literature. Inventive step by way of technical advancement of knowledge lies in altering the design of the several parts by way of technical modifications such as creating profile over surface of bushes, splining of the arms assemblies, reducingthe size of the brackets and shoe plates, replacing heavy raw material with light weight and better quality material, altering the shape of brackets etc, which not only reduce the weight of the center stand assembly, but also improves the strength, stability and durability of the same. Industrial Application is duly clear as the present invention will boost the automobile industry, by providing low weight and low cost center stand assembly which is capable of enhancing the performance and handling of the two wheeler.

[0167] As used herein, the word "a" or "an" should be understood as not excluding plural elements or operations, unless such exclusion is explicitly recited. Furthermore, references to "one embodiment" of the present disclosure are not intended to be interpreted as excluding the existence of additional embodiments that also incorporate the recited features.

[0168] The present disclosure is not to be limited in scope by the specific embodiments described herein. Other embodiments and modifications apparent to those of ordinary skill in the art from the foregoing description and accompanying drawings are intended to fall within the scope of the present disclosure. Furthermore, although the present disclosure has been described herein in the context of above, those of ordinary skill in the art will recognize that its usefulness is not limited thereto and that the present disclosure may be beneficially implemented in any pump for similar purpose.

Claims

im1. A light weight centre stand (100) for two-wheeler vehicles, particularly scooters and motorcycles wherein the same consists of following constructional features:Right main pipe (101) and left main pipe (102) each having outer diameter of 19mm with wall thickness 1.6mm and having splined outer surfaces characterized by 6 outer grooves of radius 2 mm and width 2.76 mm and 6 inner curves of radius 0.5mm and width 2.72mm;Reinforcement main pipe right (119) and reinforcement main pipe left (118) each of length 122.5 ± 0.5 mm, width at wide end 22.9 mm, wall thickness 2.3 mm, chamfered at 5 x 45° disposed adjacent the main pipes (101, 102) to provide additional structural support;Bridge pipe upper (103) of 242.4±0.5mm length, 12.7mm outer diameter, 1.4mm wall thickness and bent at both ends at angle 132° interconnecting the upper portions of left and right main pipes (101) & (102) for horizontal rigidity;Bridge pipe lower (104) of 251±0.5mm length, 12.7mm outer diameter, 1.4mm wall thickness and bends at both ends at angle 10° interconnecting lower portion of left and right main pipes (101) & (102);Pair of bush assemblies (105) and (106) of 30 mm ± 0.1 mm length, 18mm outer diameter, 10.6mm inner diameter, chamfered at angle 1 x 45° having curved profiling drawn over the surface forming crest of radius 2mm at 16 locations and trough of radius 1.5mm at 8 locations spaced 8.3mm apart and mounted / located at top of main pipes. bracket grommet holder (107) having 36.8 mm length, 26 mm ± 0.2 width, 2mm wall thickness and a hole of 10.5 mm ± 0.1 mm manufactured using cold rolled steel; pair of shoe tread plates (RH & LH) (108) of length 40.3mm, width 32±0.5mm and hole for nut placement of diameter 6mm with a curved bent surface at angle of 42° mounted at the bottom of said main pipes (101) and (102);Tread bar (109) of 196.9±0.5mm length, 15.9mm outer diameter and 1.6mm wall thickness having corrugated profile with outer grooves of 2 mm radius & 1.84 mmwidth and inner grooves of 0.5 mm radius &1.92 mm width, mounted to main tube with bracket tread bar (115);Split pin (110) of length 27mm, outer diameter 3mm and hole of diameter 6.8mm, located at tread bar (109) spring hook tread bar (111) of length 36mm, width 19.4±0.2mm, thickness 2.6mm, hook radius 2mm, flat edge of 5.9mm and has a bent at an angle 10°; a reinforcement tread bar (112) of length 50 mm, having width tapering from 8 mm to 3 mm and thickness 3 mm connected to tread bar (109) pair of upper stopper right and left (113) of 10±0.2mm width, 2mm wall thickness, 3mm bent radius and 18mm length made from cold rolled sheet mounted on reinforcement main pipe (118 & 119) to restrict upward movement of main pipes (101 & 102); a stopper tread bar (114) consisting top portion of 31.2 ± 0.2 mm length, bottom portion of 29 ± 0.2 mm length, wall thickness of 6 mm and a curved surface at one end with radius 1.5 mm, located on the tread bar (109)Bracket tread bar (115) of length 35.2±0.2mm, width 31.6±0.2mm consisting hole for nut placement of diameter 10+0.1mm and bent at bend angle 8° connecting main tube (102) to tread bar (109)Bracket tread bar (115) of length 35.2±0.2mm, width 31.6±0.2mm having a hole for nut placement of diameter 10+0.1mm and bent at bend angle 8° pivot pin tread bar (116) of 43±0.2mm, connected to tread bar (109) to allow rotational movement; tread bar foot plate (117) of 37 ± 0.5 mm length, 34mm width, 8.75 ± 0.5 mm height and wall thickness 2mm having six evenly spaced anti-slip ribs of height 0.65 mm with curved profile of radius 8 mm and manufactured using CRC-G1 steel, located at the front of the tread bar (109)Rubber grommet (120) of height 25 ± 1.0 mm, Bottom diameter 22 ± 0.5 mm, top diameter hole of diameter 11.5 ± 0.1 mm, neck diameter of 10 mm, chamfer angle 89° and top thickness 2mm; andwherein the selection of cold rolled material, and incorporation of profiled, grooved and chamfered geometries across various components results in a reduction of raw material usage by 12.4% and a total weight reduction of the centre stand assembly by 14-15%, while enhancing structural strength and durability.

2. The light weight center stand assembly (100) as claimed in claim 1 wherein the pivot pin tread bar (116) has three portions including first portion of length 7.2mm and chamfer end at angle 1x45°, centre portion of length 14.8±0.1mm, end portion of length 15.5±0.1mm with hole of diameter 3.5±0.1mm with chamfer angle 1x45° and outer diameter 12±0.1mm.

3. The light weight center stand assembly (100) as claimed in claim 1 wherein the profiled main pipe (101) & (102) has 42% and profiled thread bar has 50% more bending strength than that of existing normal centre stand assembly and both can withstand an internal pressure of 150MPa.

4. The light weight centre stand as claimed in claim 1 wherein the plain bridge pipes (103 & 104) of 1.6mm thickness are manufactured with electric resistance welded steel tubes (ERW-1) capable of withstanding 1800N load before breaking and SON load before bending.

5. The light weight centre stand as claimed in claim 1 wherein the dimension of all the parts will vary depending upon the type of the scooter / motor cycle.

6. The method for manufacturing of tube based parts including right and left main tube (101 & 102), bridge pipe upper and lower (103 & 104) and bushes (105 & 106) of light weight centre stand as claimed in claim 1 wherein the same consists the following steps: selecting cold rolled sheet and cutting to required length; passing the cut material through a series of dies under high pressure to form desired shape; incorporating profiling with pre-designed die castings having said profile; rolling the profile crafted sheets / tubes; welding the formed components to obtain complete centre stand assembly.The method for manufacturing of sheet based parts such as spring hook tread bar (111), tread bar foot plate (117), upper and lower stoppers (113), reinforcement tread bar (112), shoe tread plates (L & R) (118 & 119) and stopper tread bar (114) of light weight centre stand as claimed in claim 1 wherein the same consists the following steps: cutting the cold rolled or hot rolled steel sheets of appropriate thickness into predefined shape and size with blanking dies; pressing the sheets for bending, deep drawing and piercing / punching in pressing machine having appropriate dies; trimming excess material for surface finishing.

Images