Title of Invention

MOTORCYCLE FRAME STRUCTURE

Abstract A motorcycle frame structure comprises a pair of down tubes extending downward from the steering column tube supporting the front end of the engine; a main pipe extending backward from the steering column tube supporting the rear end of the engine, the said main pipe being attached to a bracket onto which the rear swing arm assembly is hinged through a pivot tube housed in the said bracket; a pair of cross members one end of which is attached to the outer surface of the said pivot tube while the other end of the said cross member is attached to a pair of seat rails arranged in the upper portion of the body frame to extend from the said main pipe, the said pair of cross members, the said pair of seat rails and the downward portion of the said main tube constituting an inverted triangular space for accommodating the air cleaner assembly and battery, the top pivot for the shock absorber being disposed between the cross members and the seat rails by a bracket which wraps on either side of the tubes, the pair of cross members attached to the pair of seat rails being farther way from the top pivot of the shock absorber, a gusset plate wrapped and attached on both cross-members and the seat rails.
Full Text

The present invention relates to a motorcycle frame structure.
In order to improve performance of an engine and to reduce intake noise, it is desirable that the capacity of the air cleaner is increased. In a conventional motorcycle, the air cleaner is disposed along with the battery in an inverted triangular space between members of the body frame below the seat. This construction makes it difficult to increase the capacity of the air cleaner. In order to reduce Iho sound generated in the air intake system, including the air cleaner, it is preferable to have an air cleaner of larger volume. Although the air intake sound is generated due to the air intake pulsation associated with the reciprocation of the piston within the cylinder, the larger the air cleaner volume, the lesser the air intake sound. Even though it is possible to increase the air cleaner volume sideways, it becomes significantly prominent and thus awkward in appearance. Hence there is a restriction in increasing the air cleaner volume in the said conventional frame structure without affecting the appearance.
Furthermore, in the conventional arrangement, the shock absorber top pivot is welded on a gusset provided between a cross member and the seat rails, thereby restricting the freedom of accommodating a gas

filled shock absorber with canister and also the inclination of the

shock absorber mounting angle.
Hence the objective of the present invention is to provide a motorcycle frame structure with sufficient inverted triangular space between members of the body frame in order to accommodate an air filter of larger capacity and also have the flexibility of accommodating a gas filled shock absorber with canister.
The motorcycle frame structure, according to this invention, comprises a pair of down tubes extending downward from the steering column tube supporting the front end of the engine; a main pipe extending backward from the steering column tube supporting the rear end of the engine, the said main pipe being attached to a bracket onto which the rear swing arm assembly is hinged through a pivot tube housed in the said bracket; a pair of cross members one end of which is attached to the outer surface of the said pivot tube while the other end of the said cross member is attached to a pair of seat rails arranged in the upper portion of the body frame to extend from the said main pipe, the said pair of cross members, the said pair of seat rails and the downward portion of the said main tube constituting

an inverted triangular space for accommodating the air cleaner assembly and battery, the top pivot for the shock absorber being
disposed between the cross members and the seat rails by a bracket which wraps on either side of the tubes, the pair of cross members attached to the pair of seat rails being further way from the top pivot v of the shock absorber, a gusset plate wrapped and attached on both cross-members and the seat rails.
This invention will now be described with reference to the
accompanying drawings which illustrate by way of example and not
by way of limitation one of possible embodiments of the motorcycle
frame structure proposed herein,
Fig. I illustrating a motorcycle
Fig.2 illustrates the frame structure with shock absorber
Fig.3 also illustrates the frame structure with the enlarged portion for
accommodating the air cleaner
The motorcycle M has a body frame F and front fork FR supported by steering column tube P at the front end of the body frame. The body frame is composed of a pair of down tubes D extending downward from the steering column tube supporting the front end of the engine E. A main tube F1 extends backward from steering column

tube supporting the rear end of the engine, the said main pipe being welded to a bracket B of C-section onto which the rear swing arm S assembly is hinged through a pivot tube T housed in the said C-section bracket. A pair of cross members C has one end thereof welded to the outer surface of the said pivot tube while the other end of the said cross member is welded to a pair of seat rails R arranged in the upper portion of the body frame to extend from the said main pipe. The said pair of cross members, the said pair of seat rails and the downward portion of the said main tube constitute the inverted triangular space SP for accommodating the air cleaner assembly and battery. The top pivot for the shock absorber A is disposed between the cross members and the seat rails by a bracket Al which wraps on either side of the tubes, the pair of cross members being welded to the pair of seat rails is farther way from the top pivot of the shock absorber. A gusset plate G is wrapped and welded on both cross-members and the seat rails.
By shifting the pair of cross members down and attaching the ends on the pivot tube and seat rails further away from the shock absorber pivot, sufficient inverted triangular space is generated. This space can accommodate an air cleaner of larger capacity.

The decoupling of the shock absorber mounting is achieved in the proposed arrangement. This is realised by welding the cross member away from an independent shock absorber pivot. This facilitates freedom of adjusting the shock absorber mounting angle to achieve optimum performance.
Thus sufficient space can be obtained to provide a gas filled shock absorber with canister.
It will be appreciated that various other embodiments of the motorcycle frame structure proposed herein are possible without departing from the scope and ambit of this invention.



The present invention relates to a motorcycle frame structure.
In order to improve performance of an engine and to reduce intake noise, it is desirable that the capacity of the air cleaner is increased. In a conventional motorcycle, the air cleaner is disposed along with the battery in an inverted triangular space between members of the body frame below the seat. This construction makes it difficult to increase the capacity of the air cleaner. In order to reduce the sound generated in the air intake system, including the air cleaner, it is preferable to have an air cleaner of larger volume. Although the air intake sound is generated due to the air intake pulsation associated with the reciprocation of the piston within the cylinder, the larger the air cleaner volume, the lesser the air intake sound. Even though it is possible to increase the air cleaner volume sideways, it becomes significantly prominent and thus awkward in appearance. Hence there is a restriction in increasing the air cleaner volume in the said conventional frame structure without affecting the appearance.
Furthermore, in the conventional arrangement, the shock absorber top pivot is welded on a gusset provided between a cross member and the seat rails, thereby restricting the freedom of accommodating a gas

filled shock absorber with canister and also the inclination of the shock absorber mounting angle.
Hence the objective of the present invention is to provide a motorcycle frame structure with sufficient inverted triangular space between members of the body frame in order to accommodate an air filter of larger capacity and also have the flexibility of accommodating a gas filled shock absorber with canister.
The motorcycle frame structure, according to this invention, comprises a pair of down tubes extending downward from the steering column tube supporting the front end of the engine; a main pipe extending backward from the steering column tube supporting the rear end of the engine, the said main pipe being attached to a bracket onto which the rear swing arm assembly is hinged through a pivot tube housed in the said bracket; a pair of cross members one end of which is attached to the outer surface of the said pivot tube while the other end of the said cross member is attached to a pair of seat rails arranged in the upper portion of the body frame to extend from the said main pipe, the said pair of cross members, the said pair of seat rails and the downward portion of the said main tube constituting

an inverted triangular space for accommodating the air cleaner assembly and battery, the top pivot for the shock absorber being disposed between the cross members and the seat rails by a bracket which wraps on either side of the tubes, the pair of cross members attached to the pair of seat rails being further way from the top pivot v of the shock absorber; a gusset plate wrapped and attached on both cross-members and the seat rails.
This invention will now be described with reference to the
accompanying drawings which illustrate by way of example and not
by way of limitation one of possible embodiments of the motorcycle
frame structure proposed herein,
Fig. I illustrating a motorcycle
Fig.2 illustrates the frame structure with shock absorber
Fig.3 also illustrates the frame structure with the enlarged portion for
accommodating the air cleaner
The motorcycle M has a body frame F and front fork FR supported by steering column tube P at the front end of the body frame. The body frame is composed of a pair of down tubes D extending downward from the steering column tube supporting the front end of the engine E. A main tube F1 extends backward from steering column

tube supporting the rear end of the engine, the said main pipe being ^ welded to a bracket B of C-section onto which the rear swing arm S assembly is hinged through a pivot tube T housed in the said C-section bracket. A pair of cross members C has one end thereof welded to the outer surface of the said pivot tube while the other end of the said cross member is welded to a pair of seat rails R arranged in the upper portion of the body frame to extend from the said main pipe. The said pair of cross members, the said pair of seat rails and the downward portion of the said main tube constitute the inverted triangular space SP for accommodating the air cleaner assembly and battery. The top pivot for the shock absorber A is disposed between the cross members and the seat rails by a bracket Al which wraps on either side of the tubes, the pair of cross members being welded to the pair of seat rails is farther way from the top pivot of the shock absorber, A gusset plate O is wrapped and welded on both cross-members and the seat rails.
By shifting the pair of cross members down and attaching the ends on the pivot tube and seat rails further away from the shock absorber pivot, sufficient inverted triangular space is generated. This space can accommodate an air cleaner of larger capacity.

The decoupling of the shock absorber mounting is achieved in the proposed arrangement. This is realised by welding the cross member away from an independent shock absorber pivot, This facilitates freedom of adjusting the shock absorber mounting angle to achieve optimum performance.
Thus sufficient space can be obtained to provide a gas filled shock absorber with canister.
It will be appreciated that various other embodiments of the motorcycle frame structure proposed herein are possible without departing from the scope and ambit of this invention.

We Claim:
1. A motorcycle frame structure comprising a pair of down tubes extending downward from the steering column tube supporting the front end of the engine; a main pipe extending backward from the steering column tube supporting the rear end of the engine, the said main pipe being attached to a bracket onto which the rear swing arm assembly is hinged through a pivot tube housed in the said bracket; a pair of cross members one end of which is attached to the outer surface of the said pivot tube while the other end of the said cross member is attached to a pair of seat rails arranged in the upper portion of the body frame to extend from the said main pipe, the said pair of cross members, the said pair of seat rails and the downward portion of the said main tube constituting an inverted triangular space for accommodating the air cleaner assembly and battery, the top pivot for the shock absorber being disposed between the cross members and the seat rails by a bracket which wraps on either side of the tubes, the pair of cross members attached to the pair of seat rails being farther waye from the top pivot of the shock absorber; a gusset plate wrapped and attached on both cross-members and the seat rails.

2. A. motorcycle frame structure substantially as herein described and illustrated with reference to the accompanying drawings.




We Claim:
1. A motorcycle frame structure comprising a pair of down tubes extending downward from the steering column tube supporting the front end of the engine; a main pipe extending backward from the steering column tube supporting the rear end of the engine, the said main pipe being attached to a bracket onto which the rear swing arm assembly is hinged through a pivot tube housed in the said bracket; a pair of cross members one end of which is attached to the outer surface of the said pivot tube while the other end of the said cross member is attached to a pair of seat rails arranged in the upper portion of the body frame to extend from the said main pipe, the said pair of cross members, the said pair of seat mils and the downward portion of the said main tube constituting an inverted triangular space for accommodating the air cleaner assembly and battery, the top pivot for the shock absorber being disposed between the cross members and the seat rails by a bracket which wraps on either side of the tubes, the pair of cross members attached to the pair of seat rails being farthe way from the top pivot of the shock absorber, a gusset plate wrapped and attached on both cross-members and the seat rails.

2. A motorcycle frame structure substantially as herein described
and illustrated with reference to the accompanying drawings.
, A. A

Documents:

1783-CHE-2005 AMENDED CLAIMS 23-08-2010.pdf

1783-CHE-2005 AMENDED PAGES OF SPECIFICATION 23-08-2010.pdf

1783-CHE-2005 EXAMINATION REPORT REPLY RECIEVED 23-08-2010.pdf

1783-che-2005-abstract.pdf

1783-che-2005-cliams.pdf

1783-che-2005-correspondense others.pdf

1783-che-2005-discription complete.pdf

1783-che-2005-discription provisional.pdf

1783-che-2005-drawings.pdf

1783-che-2005-form 1.pdf

1783-che-2005-form 26.pdf

1783-che-2005-form 5.pdf


Patent Number 248689
Indian Patent Application Number 1783/CHE/2005
PG Journal Number 32/2011
Publication Date 12-Aug-2011
Grant Date 04-Aug-2011
Date of Filing 06-Dec-2005
Name of Patentee TVS MOTOR COMPANY LIMITED
Applicant Address "JAYALAKSHMI ESTATES" NO. 24,(OLD NO.8) HADDOWS ROAD CHENNAI 600 006
Inventors:
# Inventor's Name Inventor's Address
1 MEGHASHYAM DIGHOLE RESEARCH AND DEVELOPMENT, TVS MOTOR COMPANY LIMITED "JAYALAKSHMI ESTATES" NO. 24,(OLD NO.8) HADDOWS ROAD CHENNAI 6001006
2 RAGHAVAN VENKATESAN RESEARCH AND DEVELOPMENT, TVS MOTOR COMPANY LIMITED "JAYALAKSHMI ESTATES" NO. 24,(OLD NO.8) HADDOWS ROAD CHENNAI 6001006
PCT International Classification Number B62K 11/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA