FORM 2
THE PA TENTS ACT 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION (See Section 10; rule 13)
TITLE OF THE INVENTION An Improved Variable Runner Intake system
APPLICANTS
TA TA MOTORS LIMITED, an Indian company
having its registered office at Bombay House,
24 Homi Mody Street, Hutatma Chowk,
Mumbai 400 001 Maharashtra, India
INVENTORS
GHADGE SAMARTH V
JOHN CHRISTOPHER
All Indian national
of TATA MOTORS LIMITED an Indian company
having its registered office at Bombay House,
24 Homi Mody Street, Hutatma Chowk,
Mumbai 400 001 Maharashtra, India
PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner in which it is to be performed.

An improved Variable Runner Intake System
Area of invention:
This present invention relates to an internal combustion engine of an automobile and more particularly it relates to an improved variable runner intake system for automobile having fixed plenum chamber volume intake manifold to meet independent ideal torque demand for independent engine speeds.
Background of the invention:
In today's engines, an injection system discharges fuel either in front of the intake valves or directly into the combustion chamber and thus promotes the intake manifold designs for more efficient gas exchange. The engine manifolds is required to distribute air, the need for a geometry system is always felt which can improve fuel economy, reduces emission and provide a higher ability of control to improve drivability performance of our vehicles.
The conventional engine employs a fixed geometry air intake system which can only be tuned to a fixed torque and power requirements The said fixed geometry air intake system are incapable to meet the increased demand due to the continuous rise in engine complexity and regulatory requirements. The said fixed geometry air intake system does not allow the shifting of the max torque point to increase torque demand at lower and higher engine speed.
The main function of an intake manifold in an internal combustion engine is to convey fresh air from the atmosphere into the cylinders and distribute the total induced mass flow equally through each of said cylinders. The said intake manifold must be tuned according to the operating characteristic of the engine. This means that length and diameter of every intake runner and eventually the volume must be chosen taking into account the complex pulsating flow along with the temporal and spatial variations of all the relevant flow variables.
The said fixed geometry air intake system of conventional system doesn't facilitate to improve or control the emission parameter such as C02, CO, Hydrocarbon of vehicle due to wear and tear of engine component such as piston, valves etc.

The present invention is developed to address the above mentioned disadvantages of the conventional system which caters the increase torque demands at all engine speed.
Object of invention
The main object of the present invention is to provide variable intake runner system,
Another object of the present invention is to provide variable intake runner system which caters the increased demand of torque and power at all engine speeds.
Another object of the present invention is to provide variable intake runner system which controls the exhaust emission.
Another object of the present invention is to provide variable intake runner system which further reduces the knocking.
Statement of invention
An improved variable runner intake system comprises; variable intake manifold; a plenum chamber having fixed volume; a plurality of intake runner members; plurality of cylinder each interfaced with respective said runners; said each intake runner members comprising a stationary member and movable member operabiy arranged to be moved over said stationary member, said stationary member located between cylinder and said movable member, each movable members disposed outside plenum chamber; said plenum chamber is integral with each of said movable members at one end and is movable with said movable members ; a flexible hose or connector for connecting other end of said movable plenum chamber with throttle body; first sealing arrangement is provided between said stationary and movable member to prevent air leakage; a second flexible sealing arrangement encloses said stationary member for sealing or preventing air entering from atmosphere to stationary runner; a bush, guide and arm arrangement provided for guiding said movable members.
An improved variable runner intake system, in accordance with the present invention, wherein said movable members are equal in length.

An improved variable runner intake system, in accordance with the present invention, wherein said stationary members are equal in length.
An improved variable runner intake system, in accordance with the present invention, wherein diameter of said movable member is greater than that of said stationary member.
An improved variable runner intake system, in accordance with the present invention, wherein said plenum chamber is interfaced with accelerator pedal and throttle body with the help of resilient member.
An improved variable runner intake system, in accordance with the present invention, said second sealing arrangement having a collar provided at each ends to hold in desired location in order to ensure a leak proof sealing arrangement.
An improved variable runner intake system , in accordance with the present invention, said first and second sealing arrangement is coated with neoprene coating.
An improved variable runner intake system , in accordance with the present invention, said movable members are connected to each other with the help of cross members.
An improved variable runner intake system, in accordance with the present invention, said arms are mounted on cylinder head.
An improved variable runner intake system, in accordance with the present invention, said bushes are-slideably mounted over said guide.
Brief Description of the Drawings:
Figure-01 shows top view of an engine in accordance with present invention
Figure-02 shows the front view of the engine according to the current invention.
Figure-03-05 shows the side views of the stationary and movable member with guide and arm arrangement.
Figure-06 shows the resilient member provided on guide.

Figure-07 shows details of the sealing arrangement in accordance with the present invention.
Detailed description
Referring now to the drawings wherein the showings are for the purpose of illustrating a preferred embodiment of the invention only, and not for the purpose of limiting the same.
In accordance with the present invention, an improved variable runner intake system comprises; variable intake manifold 01; a plenum chamber 02 having fixed volume; a plurality of intake runner members 03,04,05,06; plurality of cylinder 07, 08,09,10 each interfaced with respective said runners; each said intake runner members comprising a stationary member and movable member operably arranged to be moved over said stationary member, said stationary member located between cylinder, and said movable member, each movable members disposed outside plenum chamber; said plenum chamber 02 is integral with each of said movable members 11,12,13,14 at one end and is movable with said movable members ; a flexible hose or connector for connecting other end of said movable plenum chamber 02 with throttle body; first sealing arrangement is provided between said stationary and movable member to prevent air leakage; a second flexible sealing arrangement encloses said stationary member for sealing or preventing air entering from atmosphere to stationary runner; a bush, guide19,20 and arm 21,22 arrangement provided for guiding said movable members.
Now Referring to figure-01-07, the said intake manifold 01 having interfaced with a fixed volume plenum chamber 02 which is rigidly connected to movable members 11,12,13,14 of said intake runner members 03,04,05,06. The air induced from the atmosphere travels through geometrically identical runners 03,04,05,06 and reaches to each said cylinder 07, 08, 09, and 10. Each of said intake runner members 03, 04, 05, 06 having a stationary 15,16,17,18 and movable members 11,12,13,14. The said plenum chamber 02 is rigidly connected to said movable members 11,12,13,14 thereby said plenum chamber 02 is also movable along

with said movable members 11,12,13,14 said intake runner members 03,04,05,06.
The each of said movable members 11,12,13,14 slides over the respective stationary members 15,16,17,18 thereby continuously changing the effective passage length of the intake runner geometry. The motion of the said movable members 11,12,13,14 is guided with the help of a guide 19, 20. The said guide is a hollow tubular member made up preferably of steel which is held in place by said arm 21, 22. The arms 21, 22 are mounted to the cylinder head.
The said movable member 11,12,13,14 is operably arranged to be moved over the said stationary members 15,16,17,18 either directly or indirectly by an electric motor. When the engine is running, air is drawn, through air cleaner, resonator and throttle body arrangement, into the fixed volume of said plenum chamber 02. Said air drawn is transported through the said movable members 11, 12, 13, 14 and stationary members 15,16,17,18 into their respective combustion chambers via inlet ports 23,24,25,26.
At lower engine speeds the pulsating cycle in the said intake manifold 01 is relatively longer. Thus the effective length of said intake runner members 03,04,05,06 is increased by sliding the said movable members 11, 12, 13, 14 along with the fixed volume plenum chamber 02 to a new runner length to match the wavelength of the pulsating air flow. Thus the volumetric efficiency of the intake air is increased as it takes its advantage of inertia effect without disturbing the cycle of the pulsating flow. This improves the combustion efficiency of the air fuel mixture in the combustion chamber.
At higher engine speed, the said movable members 11, 12, 13, 14 are retracted back along with the fixed volume plenum chamber 02 in order to shorten the effective runner length passage. The said movable members 11, 12, 13, 14 are retracted back along with the fixed volume plenum chamber 02 with the help of suitable drive means such as electric motor. The pulsation cycle of the air flowing through each of the said intake runners 03,04,05,06 get reduced as engine rpm increases. The natural wave length of the air flowing through each of the said intake runners 03,04,05,06 is aiso relatively shorter thus the retracted movable

member 11, 12, 13, 14 accordingly improves the combustion efficiency. The said movable members 11, 12, 13, 14 along with the said plenum chamber 02 is moved up and down along the guides thereby varying the length of said intake runner in accordance with the variations in engine speed in order to maintain a constant optimum state of operation. Each of the said stationary members 15,16,17,18 are of equal length. Also each of said movable runner members 11, 12, 13, 14 are having equal length.
First sealing arrangement 38,39,40,41 is provided between said stationary and movable member to prevent air leakage. A second flexible sealing arrangement . which is flexible jacket enclosing said stationary member for sealing or preventing air entering from atmosphere to stationary runner. The said first and second flexible sealing arrangement 27,28,29,30 is a neoprene coated seal.
The said second sealing arrangement. 27,28,29,30 having a collar 37 provided at each ends to hold in desired location in order to ensure a leak proof sealing arrangement. All said stationary members 15,16,17,18 are connected to each other and rigidly held with the help of an intake flange 31 which is mounted to the said cylinder head.
The said movable members 11,12,13,14 are connected to each other with the help of a cross members 32, 33 at one end and other end is rigidly connected to said plenum chamber 02. The said cross member 32, 33 incorporates a first set of hollow steel insert or bushes 34, 35, and second set of said insert 36, 37 which provides a controlled tolerance with the said guide during operation. At least four hollow steel inserts or bushes 34,35,36,37 are provided in order to ensure a lower life cycle cost and improved reliability of the system.
The intake manifold 01 having a guide 19, 20 and an arm 21, 22. The motion of the said movable member 11,12,13,14 is guided and constrained by the guide 19, 20. The guides 19, 20 are held in place with the help of arms 21, 22. Said bushes are slideably mounted over said guide.
The sliding motion of the said movable member 11,12,13,14 is achieved by a suitable drive means such as electric motor whose shaft rotation is converted into

sliding motion of said movable members 11,12,13,14 to achieve a variable runner length. During stalled conditions the said movable member 11,12,13,14 are positioned such that the effective length of the intake runner is maximum. As the engine speed increases the drive means such as electric motor retracts the said movable members 11,12,13,14 thereby shortening the effective length of the said intake runners. The said movable members 11,12,13,14 slides over the said stationary members 15,16,17,18 such that the effective length of the said intake runner 03,04,05,06 conforms to the natural wavelength of the air flow through the said intake runners under all RPM and load conditions.
The runner length is adjusted to reduce emission of vehicle at all operating speed, temperature and this is managed by ECU. The ECU takes the input from the oxygen sensor for controlling the emission and accordingly ECU changes the runner length.
The variation of runner length also reduces knocking effect at particular temperature and speed. The ECU takes the input from knock sensor to optimise the runner length in order to reduce the knock.
The present invention can be made compatible with EMS having a mechanical throttle, electronics throttle body etc and independent of EMS control with only mechanical throttle body, depending upon the level of accuracy and precision required. The present system can be actuated with the help of simple mechanical linkages which gets its drive from accelerator pedal for non EMS control system.
The accelerator pedal with retaining spring is interfaced with the said plenum chamber 02 for activating the said plenum chamber 02 which is movable member in accordance with the speed of vehicle and torque demand. Similarly the said accelerator pedal is also interfaced with said throttle body with the help of retaining spring, for operating the throttle.
At least two resilient member 20A such as springs are provided on the said guide to smoothly operate the said movable member.
The foregoing description is a specific embodiment of the present invention. It should be appreciated that this embodiment is described for purpose of

illustration only, and that numerous alterations and modifications may be practiced by those skilled in the art without departing from the spirit and scope of the invention. it is intended that all such modifications and alterations be included as they come within the scope of the invention as claimed or the equivalents thereof.

We claim
1. An improved variable runner intake system comprises; variable intake manifold; a plenum chamber having fixed volume; a plurality of intake runner members; plurality of cylinder each interfaced with respective said runners; said each intake runner members comprising a stationary member and movable member operably arranged to be moved over said stationary member, said stationary member located between cylinder and said movable member, each movable members disposed outside plenum chamber; said plenum chamber is integral with each of said movable members at one end and is movable with said movable members ; a flexible hose or connector for connecting other end of said movable plenum chamber with throttle body; first sealing arrangement is provided between said stationary and movable member to prevent air leakage; a second flexible sealing arrangement encloses said stationary member for sealing or preventing air entering from atmosphere to stationary runner; a bush, guide and arm arrangement provided for guiding said movable members.
2. An improved variable runner intake system as claimed in claim 1, wherein said movable members are equal.in length.
3. An improved variable runner intake system as claimed in claim 1, wherein said stationary members are equal in length.
4. An improved variable runner intake system as claimed in claim 1, wherein diameter of said movable member is greater than that of said stationary member.
5. An improved variable runner intake system as claimed in claim 1, wherein said plenum chamber is interfaced with accelerator pedal and throttle body with the help of resilient member.
6. An improved variable runner intake system as claimed in claim 1, said second sealing arrangement having a collar provided at each ends to hold in desired location in order to ensure a leak proof sealing arrangement.

7. An improved variable runner intake system as claimed in claim 1, said first and second sealing arrangement is coated with neoprene coating.
8. An improved variable runner intake system as claimed in claim 1, said movable members are connected to each other with the help of cross members.
9. An improved variable runner intake system as claimed in claim 1, said arms are mounted on cylinder head.
10. An improved variable runner intake system as claimed in claim 1, said bushes are slideably mounted over said guide.
11. An improved variable runner intake system as herein described with reference to accompanying drawings.