FORM 2
THE PATENT ACT 1970
&
The Patents Rules, 2003
PROVISIONAL / COMPLETE SPECIFICATION (See section 10 and rule 13)
1. TITLE OF THE INVENTION
"AN IMPROVED CHASSIS WITH SUSPENSION FOR THREE WHEELERS
AND AUTOMOBILES"
2. APPLICANT
(a) NAME : KUMAR MOTORS PRIVATE LIMITED
(b) NATIONALITY: Indian Company registered under the provisions of the
Companies Act, 1956

(c) ADDRESS

:Gat No. 316, At Kasar Amboli, Post: Ambadwet,
Tal: Mulshi, Dist: Pirangut,
PUNE - 412 111, Maharashtra State, India

3. PREAMBLE TO THE DESCRIPTION

.PROVISIONAL
The following specification describes the invention.

COMPLETE
The following specification particularly describes the invention and the manner in which it is to be performed.

4. DESCRIPTION (Description starts from page 2)

5. CLAIMS:

Given on a separate sheet

6. DATE AND SIGNATURE: Given at the end of last page of specification.
7. ABSTRACT OF THE INVENTION: Given on a separate sheet.
The following specification describes the nature of this invention:

The present invention relates to an improved chassis with suspension for three wheelers and automobiles. More particularly, it relates to an improved chassis with suspension for three wheelers and automobiles that distribute load evenly through out the vehicle.
PRIOR ART:
In the conventional method, the chassis for three wheelers and automobiles are available in four types namely:
1. Tubular Ladder Type
2. Monocoque Type
3. Ladder Type pressed parts with single central tube as load taking member assisted by pressed cab floor as a single unit.
4. Tubular ladder with parallel two long members.
The tubular ladder type chassis are of straight ladder acting as beam in single plain re-enforced with cross members. The long members of the chassis are not pre-stressed to ensure stiffness of long member. This stiffness of long member is the only function of mechanical properties of tubular member. The cross members are face welded to the long members that makes welding as primary load taking member. The steering fork reaction is taken by single tube and is bend in the direction of the load, from which it is put. There is no member on the neck of the steering tube to take additional reaction and to directly transfer the reaction to the long member. Additional closed section cross member is provided with member welded to the neck of the tube.
DEFICIENCIES OF PRIOR ART:
1 That in the tubular ladder type chassis; welding is the primary load-taking member on junction points. This welding may fail due to vibration, oxidation and torsion, causing weakening of junction points of the chassis.
2

2. That in the tubular ladder type chassis; due to ladder in single plain, sagging of beam might occur in heavy loading.
3. That in the tubular ladder type chassis, the major loading points are not on shear centre of the section, due to this individual loading point may cause twist in long member.
4. in straight ladder type chassis the cabin floor height is high resulting in inconvenience while stepping inside cabin.
5. That the monocoque chassis is not suited for goods carrying application as seen in India.
6. That in the monocoque chassis the initial cost of production is very high.
7. That the monocoque chassis design offers limitations in terms of application flexibility.
SUMMARY OF THE PRESENT INVENTION:
The present invention is directed towards a construction of a chassis that runs through out the length of vehicle to facilitate even distribution of load on vehicle.
The purpose of the present invention is to construct a chassis wherein the load points are put on long member on its shear centre as against on welding, in conventional chassis, to causes direct shear stress on member and thereby provides rigidity to the construction even the vehicle is overloaded.
3

The object of the present invention is to construct a chassis that takes overload as a base from actual market loading pattern to provide safety and develop a chassis that proves to be strong and durable.
The purpose of the present invention is to construct a chassis that is stiffer and has major vibration damping capacity as compared to the conventional chassis.
The aim of the present invention is to construct a chassis wherein load points are put on long member on its shear centre to cause direct shear stress on member rather than on welding that is a common feature of conventional chassis.
ADVANTAGES OF PRESENT INVENTION:
1. Being long member is in two plane, stiffness does not depend purely on the mechanical properties of the section.
2. That the long member is pre-stressed to increase the stiffness of member.
3. That in the present invention, long member of chassis runs through out the length of the vehicle that facilitates even load distribution.
4. The stiffness of rectangular hollow section long member and circular hollow cross members is more than rectangular hollow long members and have 'C channel cross members.
5. That the present invention wherein cross members are going throughout the long members, welding acts as only fastening devise
4

{!

and not direct load taking member. Cross member is supported through out the section of the long member with fasten by welding on both side to make the junction point stiff and strong.
6. That the present invention facilitates best and simple packaging in its class.
7. That the present invention is strong in its class and has got better durability.
8. That the present invention is cost effective in terms of tooling and construction and has less lead time to manufacture.
PRESENT INVENTION:
The foregoing objects of the invention are accomplished and the problems and shortcomings associated with prior art administration techniques and approaches are overcome by the incorporation of an improved chassis with suspension for three wheelers and automobiles.
The chassis of the present invention is illustrated in figure 1 of the accompanying drawing.
The chassis of the present invention comprises of cross members (1), rear cross member(2), steering column(3), bump stopper bracket(4), spring holding bracket(5), engine cross member(6), engine mounting bracket(7) & (8), long member(9), load body bracket(10),suspension pivot tube (11), hub holding brackets 2).
5

In the present invention, all the cross members(1) goes through the long members(9) where welding becomes secondary. The long member (9) is a single horizontal tube formed to the desired shape such that it gives a pre-stressed longitudinal member (beam) running through out the length of the vehicle. This long member(9) on account of the form has tremendous load carrying capabilities due to increase in bending moment (BM). The load body bracket (10) has been placed at the angle of the bend to support the load body platform that comes above it. This LBD provides maximum load carrying capability on account of a high bending moment. The steering column(3) is so constructed that all road excitations are transferred to the long members(9) and the cross members(1). The rake angle is so provided that steering effort is to the barest minimum which reduces driver fatigue. The suspension pivot tube (11) is so positioned and given an angle that l/e ratio is optimized to give excellent ride and road handling characteristics. A one degree chamber has been given between the inner and outer of suspension pivot tube(11) to enable better tyre and road holding characteristics under load conditions. The engine mounting bracket (7) and (8) are so designed and constructed that they ensure that the roll axis of engine is within the roll axis of vehicle so that engine vibration is to a minimum. The engine cross member (6) is so positioned that it support the rear of engine gear box mounting point from above, thereby providing excellent service accessibility from the rest of three sides i.e left, right and below and also transferring any vibrations if developed on to the long member(9). The spring holding bracket (5) has been designed to sustain the load at spring solid length in cases of overloading of the vehicle. The bump stopper bracket(4) has been designed to hold the bump stopper which act as secondary spring in addition to the coil spring provided at the rear. The rear cross member(2) acts as a cross member as well as protection to the engine from the rear side in case of collision. The hub holding bracket(12) is so designed to accommodate the hub by way of bolting, so that in event of repair, one has to only replace the hub. This bracket (12) also takes the entire load transmitted through the wheels and the stub axle.
6

Detailed descriptions of the preferred embodiment are provided herein; however, it is to be understood that the present invention may be embodied in various forms. Therefore, specific details disclosed herein are not to be interpreted as limiting, but rather as a basis for the claims and as a representative basis for teaching one skilled in the art to employ the present invention in virtually any appropriately detailed system, structure or matter.
The embodiments of the invention as described above and the method disclosed herein will suggest further modification and alterations to those skilled in the art. Such further modifications and alterations may be made without departing from the spirit and scope of the invention; which is defined by the scope of the following claims.
7

WE CLAIM:
1. An improved chassis with suspension for three wheelers and automobiles comprising of cross members (1); rear cross member(2); steering column(3); bump stopper bracket(4); spring holding bracket(5); engine cross member(6); engine mounting bracket(7) & (8); long member(9); load body bracket(10); suspension pivot tube (11); hub holding bracket(12);
all the cross members(1) goes through the long members(9) where welding becomes secondary; the long member (9) is a single horizontal tube formed to the desired shape such that it gives a prestressed longitudinal member (beam) running through out the length of the vehicle; the said long member(9) on account of the form has tremendous load carrying capabilities due to increase in bending moment (BM). the load body bracket (10) has been placed at the angle of the bend to support the load body platform that comes above it; the said load body bracket(10) provides maximum load carrying capability on account of a high bending moment; the steering column(3) is so constructed that all road excitations are transferred to the said long members(9) and the said cross members(1); the rake angle is so provided that steering effort is to the barest minimum which reduces driver fatigue; the suspension pivot tube (11) is so positioned and given an angle that l/e ratio is optimized to give excellent ride and road handling characteristics; a one degree chamber has been given between the inner and outer of said suspension pivot tube(11) to enable better tyre and road holding characteristics under load conditions; the engine mounting bracket (7) and (8) are so designed and constructed that they ensure that the roll axis of engine is within the roll axis of vehicle so that engine vibration is to a minimum; the engine cross member (6) is so positioned that it support the rear of engine gear box mounting point from above, thereby providing excellent service accessibility from the rest of three sides left, right and below and also transferring any vibrations if developed on to the said long member(9); the spring holding bracket (5) has been designed to sustain the load at spring solid length in
8

cases of overloading of the vehicle; the bump stopper bracket(4) has been designed to hold the bump stopper which act as secondary spring in addition to the coil spring provided at the rear; the rear cross member(2) acts as a cross member as well as protection to the engine from the rear side in case of collision; the hub holding bracket(12) is so designed to accommodate the hub by way of bolting, so that in event of repair, one has to only replace the hub; the said bracket (12) also takes the entire load transmitted through the wheels and the stub axle.
2. An improved chassis as claimed in claim 1 substantially as herein before described with reference to and as shown in the accompanying drawing and specification.
Dated this 18th of October,2006.

9

Abstract
The present invention relates to an improved chassis with suspension for three wheelers and automobiles. More particularly, it relates to an improved chassis with suspension for three wheelers and automobiles that distribute load evenly throughout the vehicle.
The chassis of the present invention comprises of cross members, rear cross member, steering column, bump stopper bracket, spring holding bracket, engine cross member, engine mounting bracket, long member, load body bracket, suspension pivot tube, hub holding bracket. The load points are put on long member on its shear centre to cause direct shear stress on member and therby provides rigidity to the construction even the vehicle is overloaded. The present invention relates to a construction of chassis that takes overload as a base from actual market loading pattern to provide safety and develop a chassis that proves to be strong and durable.