FORM 2
THE PATENTS ACT 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
PROVISIONAL SPECIFICATION
(See Section 10; rule 13)
TITLE OF INVENTION


New Position For Engine Mounts To Reduces The Engine Movements Particularly Rocking Type Or Vibrations And For Increase The Life Of The Mounts
APPLICANTS
TATA MOTORS LIMITED, an Indian company
having its registered office at Bombay House,
24 Homi Mody Street, Hutatma Chowk,
Mumbai 400 001 Maharashtra, India

INVENTORS
Mrs. Charu Saxena and Mr. Amol Majgaonkar
Both are Indian Nationals
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 describes the invention.


FIELD OF INVENTION
This invention relates to a new position of Engine mounts in passenger cars segment for increase in the life of the mounts and reduction in the engine movement particularly rocking movement and is specially applicable for Passenger Cars with Transverse position of engine.
The new position of engine mounts of this invention relates to position of two rigid mounts "A" and "B" perpendicular to crankshaft axis, and third mount will be flexible and perpendicular to A and B mount called "C" mount.
BACKGROUND OF INVENTION
An engine mount must satisfy two essential but conflicting criteria. First, it should be stiff and highly damped to control the idle shake and engine mounting resonance over 5±30 Hz. Also, it must be able to control, like a shock absorber, the motion resulting from quasistatic load conditions such as travel on bumpy roads, abrupt vehicle acceleration or deceleration, and braking and cornering. Second, for a small amplitude excitation over the higher frequency range, a lightly damped mount is required for vibration isolation and acoustic comfort, like a C rubber mount, it can satisfy both requirements simultaneously as the lumped stiffness kr and the viscous damping coefficient br in the shear mode are nearly invariant with excitation amplitude and frequency over the concerned excitation range (say 1±250 Hz) of vehicle systems.
Thus, a compromise between resonance control and isolation is inevitably needed.
The mount is typically optimized for placement, orientation, kr and br, to meet performance requirements. Mechanical mounts should be designed in such a way that it can provide improved stiffness and damping characteristics which vary with frequency and excitation amplitude.

An automotive engine-body-chassis system is typically subjected to unbalanced engine forces, uneven firing forces especially at the idling speeds, dynamic excitations from gearboxes and accessories, and road excitation. Since design trends have been towards compact and efficient automobiles, engine-to-frame weight ratio and engine force densities have increased. Consequently, recent research and development efforts have been focused on improving engine mounting technology to achieve better vibration isolation, smooth vehicle movement and noise reduction. Such dynamic design issues are illustrated via the engine mount position study. A new adaptive engine mounting positions are proposed in this invention.
Referring to fig. 1, in current practice the engine assembled transversely which means the crank shaft axis parallel to wheel track, for this type of assembly three mounts A, B, & C are provided as shown in figure.
Due to minor unbalancing of engine which causes vibrations, also the Flywheel of engine rotate in clockwise direction, so the piston movement and rotation of flywheel create Centrifugal forces which tends to rock it heavily about the axis which is imaginary and passes through A and B mount. The 'C mount is flexible which contains sliding stroke, and guide the rocking movement of engine.
Due to the current position of mounts, overhang between A and B mount increases, which reduces the life of the mounts. Engine rocking causes the fouling issues of various components, also it will provide impacts on all three mounts.
Fig .1 shows the current position of engine mounts, the mount 'A' (4) is mounted on RH Crash member(l) and connected to cylinder block (8), the mount 'B' is mounted on LH Crash member(2) and connected to transaxle (9),
similarly the Flexible mount 'C* (6) is mounted on cross member (10) and connected to transaxle (9). This is ahead of firewall (7).

In current situation the failure of 'C mount result in oscillation or rocking of the engine heavily, so 'C' mount acts as a stopper in current situation, otherwise engine is free to oscillate about the 'A' and 'B' mount.
OBJECTS OF INVENTION
The main object of this invention is to reduce the engine movements particularly of rocking movements.
Yet another object of the invention is to increase in the life of the mounts, which will give better performance of engine.
Yet another important object of the invention is that it will damp the vibrations of engine, and give more comfort to passengers.
Yet another object of the invention is that it will provide positive clamping of the engine.
BRIEF DESCRIPTION OF INVENTION
The main object of this invention is to reduce the engine movements particularly of rocking movements, and to increase the life of the mounts.
Due to minor unbalancing of engine which causes vibrations, also the Flywheel of engine rotate in clockwise direction, so the piston movement and rotation of flywheel create Centrifugal forces which tends to rock it heavily about the axis which is imaginary and passes through A and B mount. The 'C mount is flexible which contains sliding stroke, and guide the rocking movement of engine.
Due to the current position of mounts, overhang between A and B mount increases, which reduces the life of the mounts. Engine rocking causes the fouling issues of

various components, also it will provide impacts on all three mounts, so if we change the two rigid mountings position A mount (4) and B mount Position (5) i.e. perpendicular to existing position, and 'C" mount (6) will be mutually perpendicular to 'A' And 'B' mounts, then it will reduce the overhang of mounts, and finally increases the life of the mounts.
BRIEF DESCRIPTION OF DRAWINGS
Fig. 1 shows a current position of Engine Mounts with surrounding components. Fig. 2 shows the invented position of engine mounts with assembly Members.
DETAILED DESCRIPTION OF INVENTION AND ASSEMBLY PROCEDURE
Referring to fig.2, the assembly cross member (11) having a welded high strength bracket(12), and this complete cross member assembly (11) rigidly fix between the two long members RH Crash member(l) and LH Crash member(2).
The one side of 'A5 mount assembly (4) is bolted on cross member assembly (11) and another side will fix on Cylinder Block Assy.(8). The 'A' mount will be provided behind the Cylinder block assy.(8) or can say at the firewall (7) side. Similarly the one more cross member assembly (14) will be provided in front of cylinder block assembly (8) and it will be rigidly fixed between the two long members RH Crash member (1) and LH Crash member (2).These two long members are very stiff, having good strength and the total Front Axle forces are carried by these two members. The 4B; Mount cross member assembly (14) assembly carries the welded bracket (13) with heavy reinforcements. One end of 'B' mount will fix on Cylinder Block Assy.(8), by suitable fasteners and the other end will be fixed on cross member assembly (14).

The construction of 'C mount will be same as existing, except the change of mounting position. The Bracket assembly (15) is provided on LH Crash member (2), the one end of 'C mount will fix on transaxle assembly (9), and the other end will fix on Bracket assembly (15), it is flexible in construction.
When the Engine starts, the centrifugal forces will tends to rock the engine along the direction of rotation of flywheel, but due to A, B mounts these movements gets restricted by large amount, and the C mount will take very small lateral play.
Due to reduction in overhang the mount life will increase.
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 insofar as they come within the scope of the invention as claimed or the equivalents thereof.
Dated this 26th day of March 2009

(Karuna Goleria) of De PENNING & De PENNING
TATA Motors Limited By their Agent & Attorney