FORM 2
THE PATENTS ACT 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(See Section 10; rule 13)
TITLE OF THE INVENTION
Power Train Protection System From Overloading
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
Mr. Udayakanth G
Mr. Jyothis Balakrishnan
both 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 particularly describes the invention and the manner in which it is to be performed.

Field of invention
The present invention is related to the power train system of automobiles and more particularly it relates to power train prevention system from overloading which prevents the power train and its components by automatic cut off when vehicle is overladed than rated capacity.
Background of invention
It's a general practice of the user of the commercial vehicles to overload the vehicle, knowingly or unknowingly, while in the field use . Due to the overloading of the vehicles, the traction and braking force required are very high of the vehicle. The said traction and braking forces are transmitted through the power train components between tire and the engine, this leads to the gear box damage, propellar shaft breakage and differential damage.
The present invention is an attempt to address the above said failures of the power train system due to the overloading of the vehicle. The flow of traction and the braking forces through the power train system is discontinued or cut-off when the vehicle is overloaded and the same is indicated to the user or driver for off loading the vehicle to the rated capacity. Thus avoiding or preventing the breakdown of the vehicles due to the failure of power train components when the vehicles are overloaded.
Object of invention
The main object of the present invention is to provide a power train protection system from overloading.
Another object of the present invention is to provide a power train protection system from overloading which prevents the failure of power train components when vehicles are overloaded.

Another object of the present invention is to provide a power train protection system from overloading which indicate the driver the overloading of the vehicle, to prevent the failure of power train components due to high traction and braking forces and also to prevent accidents due to overloading of vehicles.
Yet another object of the present invention is to provide a power train protection system from overloading which is simple in constructions and cost effective.
Statement of invention
Power train protection system comprises; propeller shaft yoke , rear shaft member fastened to said propeller shaft, a centre bearing assembly provided for supporting the said rear shaft member is mounted on frame of vehicle, actuator mounted on the frame of vehicle, a slider connected to said actuator through a bearing , a front shaft member connected to gear box output flange , said front shaft member and rear shaft member are disposed co-axially at a predetermined gap and engaged with said slider , said slider operable to be disengaged from said front shaft member, a controller for activating said actuator based on loading condition of said vehicle to operate said slider.
Power train protection system, in accordance with present invention, wherein the said actuator is a pneumatic cylinder which actuates the said slider based on said controller input.
Power train protection system, in accordance with present invention, wherein the said bearing is a ring bearing through which said slider is rotatably disposed.
Power train protection system, in accordance with present invention, wherein the said gap is at least 10 mm.
Power train protection system , in accordance with present invention, wherein the said front shaft member and rear shaft member are having splined portion provided

for smooth sliding of slider.
Power train protection system, in accordance with present invention, wherein the said slider is disposed co-axially with said front shaft member and rear shaft member.
Power train protection system, in accordance with present invention, wherein the said slider is having internal spline profile matching with the spline of said front shaft member and rear shaft member.
Power train protection system, in accordance with present invention, wherein said controller activate said actuator to disengage said slider on overloading condition
Brief description of invention
In accordance with the present invention, Power train protection system comprises; propeller shaft yoke 1, rear shaft member 2, actuator 3 mounted on the frame of vehicle, slider 4 connected to said actuator 3, bearing 5 through which said slider means 4 is connected to said actuator 3, front shaft member 6, gear box flange 7 and centre bearing assembly 8 mounted on frame of vehicle and is provided for supporting the said rear shaft member 2 , said propeller shaft 1 is fastened to said rear shaft member 2, said front shaft member 6 is fastened to said gear box flange 7, said front shaft member 6 and rear shaft member 2 are disposed co-axially such that certain gap 10 is maintained, said actuator 3 is rigidly connected to said bearing 5 and said slider 4 is disposed through the said bearing 5 such that said slider 4 bridge the said gap between said front shaft member 6 and rear shaft member 2 in normal working condition, overloading signal is provided to actuator 3 by a controller 13 which is a Load Sensing Valve (LSV), which actuates and pushes the said slider 4 to slide over said rear shaft member 2 and disconnecting the power transmission from the gear box, Electrical interface Unit (EIU) 14 receives the pneumatic signal from said controller 13 when overloaded and gives electric signal to the indicator 15 which is provided in the cockpit or cab.

Brief description of Drawing
Figure-01 shows isometric view of power train protection system in accordance with the present invention.
Figure-02 shows the front view of power train protection system in normal working
condition.
Figure-03 shows the front view of the power train protection system in
disconnected transmission when vehicle is overloaded.
Figure-04 shows the top view of power train protection system.
Figure-05 shows various views of front shaft member of power train protection
system.
Figure-06 shows the various views of slider means with the bearing means mounted
thereon.
Figure-07 shows the various views of rear shaft member of power train protection
system.
Figure-08 shows the sectiononal view of power train protection system.
Detailed description of invention
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,
Now referring to figure-01 to 08,
In accordance with the present invention, Power train protection system comprises; propeller shaft yoke 1, rear shaft member 2, actuator 3 mounted on the frame of vehicle, slider 4 connected to said actuator 3, bearing 5 through which said slider 4 is connected to said actuator 3, front shaft member 6, gear box flange 7 and centre bearing assembly 8 mounted on frame of vehicle and is provided for supporting the said rear shaft member 2 , said propeller shaft 1 is fastened to said rear shaft member 2, said front shaft member 6 is fastened to said gear box flange 7, said

front shaft member 6 and rear shaft member 2 are disposed co-axially such that certain gap is maintained, said actuator 3 is rigidly connected to said bearing 5 and said slider 4 is disposed through the said bearing 5 such that said slider 4 bridge the said gap 10 between said front shaft member 6 and rear shaft member 2 in normal working condition, overloading signal is provided to actuator 3 by a controller 13 which is a Load Sensing Valve(LSV), which actuates and pushes the said slider 4 to slide over said rear shaft member 2 and disconnecting the power transmission from the gear box. Electrical interface Unit (EIU) 14 receives the pneumatic signal 13 b from said controller 13 when overloaded and gives electric signal 14a to the indicator 15 which is provided in the cockpit or cab.
Said front shaft member 6 is connected to the gear box flange 7. Said rear shaft
member 2 is connected to the said propeller shaft yoke 1 through the centre bearing
assembly 8.
Pneumatic supply (compressed air) 17 is provided to said controller 13 from main
air-tank of the vehicle.
Said controller 13 gives out highest pressure air only when the vehicle is
overloaded.
When vehicle overloaded, a lever 16 which is connected between the rear axle of
vehicle and the said controller 13 enables said controller 13 to send pneumatic
signal 13a to said actuator 3.
Said actuator 3 is a single acting pneumatic cylinder, which is resiliency retractable such as spring retracted, which actuates the said slider 4 through the said bearing 5 after receiving the pneumatic signal in the form of highest air pressure for compressing the spring inside the actuator 3 when it is overloaded.
Said slider 4 having groove provided therein, is rotatebly disposed in said bearing 5 such as ring bearing which sits on said groove 9 such that said slider 4 can rotate in said bearing 5 and the extension thereof is rigidly connected to said actuator 3.

The said front shaft member 6 and rear shaft member 2 are having splined portion 11. The said front shaft member 6 and rear shaft member 2 are disposed with certain co-axial gap between them and said slider 4 is also disposed co-axially such that the said slider 4 bridges the said gap 10 between said front shaft member 6 and rear shaft member 2 in engaged condition.
The said slider 4 having internal spline 12 provided to match the spline 11 of said front shaft member 6 and the rear shaft member 2.
The said front shaft member 6 and rear shaft member 2 are disposed co-axially and at least 10 mm co-axial gap 10 is maintained which is bridged or coupled with the help of said slider 4 when in normal running condition.
The said front shaft member 6 and rear shaft member 2 are having splined portion 11 near to the gap between them and the said slider 4 with internal splines 12 matching with the splines 11 provided on said front shaft member 6 and rear shaft member 2. The internal splines 12 of the said slider 4 are provided in such a way that said slider 4 can easily slide over the splines 11 of said front shaft member 6 and rear shaft member 2 to bridge the said gap 10 between them during normal running condition.
The said front shaft member 6, rear shaft member 2 and said slider 4 are the active components which make and break the power transmission based on the pneumatic signals from said controller 13 such as load sensing valve.
When the vehicle is overloaded, the controller 13 transmits the pneumatic signal 13a in the form of high air pressure to the said actuator 3 which is a single acting pneumatic cylinder, which is resiliently retractable such as spring retracted, which actuates the said slider 4 through the said bearing 5 after receiving the pneumatic signal in the form of highest air pressure for compressing the spring inside the actuator 3 when it is overloaded.
Said Controller 13 sends pneumatic signal 13a to said actuator 3 which actuates

and pushes the said slider 4 which slides over the rear shaft member 2, disconnecting the power flow from the gear box. The said slider 4 keeps the said front shaft member 6 and rear shaft member 2 disconnected till the overload is removed.
Electrical interface Unit (EIU) 14 receives the pneumatic signal 13b from said controller 13 such as Load sensing valve when overloaded and gives electric signal 14a to the indicator 15 which is provided in the cockpit or cab so that overloading can be removed.
Upon the removal of overloading, the said actuator 3 actuates the said slider 4 to slide back towards the said front shaft member 6 to bridge the said gap 10 between said front shaft member 6 and rear shaft member 2 based on the signal from load sensing valve 13 such that the power can be transmited in normal way.
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 in so-far as they come within the scope of the invention as claimed or the equivalents thereof.

We Claim
1. Power train protection system comprises; propeller shaft yoke , rear shaft
member fastened to said propeller shaft, a centre bearing assembly
provided for supporting the said rear shaft member is mounted on frame of
vehicle, actuator mounted on the frame of vehicle, a slider connected to
said actuator through a bearing , a front shaft member connected to gear box
output flange , said front shaft member and rear shaft member are disposed
co-axially at a predetermined gap and engaged with said slider , said slider
operable to be disengaged from said front shaft member, a controller for
activating said actuator based on loading condition of said vehicle to operate
said slider.
2. Power train protection system as claimed in claim 1, wherein the said actuator is a pneumatic cylinder which actuates the said slider based on said controller input.
3. Power train protection system as claimed in claim 1, wherein the said bearing assembly is a ring bearing through which said slider is rotatably disposed.
4. Power train protection system as claimed in claim 1, wherein the said gap is at least 10 mm.
5. Power train protection system as claimed in claim 1, wherein the said front shaft member and rear shaft member are having splined portion provided for smooth sliding of slider.
6. . Power train protection system as claimed in claim 1, wherein the said slider is disposed co-axially with said front shaft member and rear shaft member.
7. Power train protection system as claimed in claim 1, wherein the said slider is having internal spline profile matching with the spline of said front shaft