FORM 2
THE PATENTS ACT 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(See Section 10; rule 13)
TITLE OF THE INVENTION
Gear Box PTO Driven AC Compressor System
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
Dr. Ajoy.K.Das, Mr.V.K.Garg & Mr. Kausik Ray
AH 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
This invention is related to mechanical drive arrangement system of compressor for automobile Heating Ventilation and Air Conditioning (HVAC) system and more particularly it relates to the gear box Power Take Off (PTO) driven AC compressor system.
BACKGROUND OF INVENTION
In general compressor for air conditioning in commercial vehicle are driven by engine crank pulley or a separate engine is used to run the compressor.
In the later case the engine driving AC compressor also has to meet the prevalent emission and noise norm, which makes the arrangement expensive. Hence engine driven AC compressor is preferred for simplicity & cost effectiveness. This arrangement is required to clear space either left or right side of the engine and beyond the chassis. Because AC compressor pulley is placed in such a condition that it should lie in same vertical plane with engine crank pulley.
Some disadvantages of these systems are longer belt, obstruction in left or right side of the frame and high frequency of belt tension adjustment, etc. The stringent customer need was to provide clear front spacing for door provision at opposite of the driver side. Thus it was not feasible to drive the compressor from engine directly in the existing layout.
The present system can overcome these difficulties. The total driving arrangement is placed on side of the frame. So it is more compact in nature. The v belt length is adequately smaller than existing system.

Prior Arts:
WO2008136796 discloses about a multiple compressors are connected to a common shaft of a drive motor. Provision may be made for selectively disengaging one or more of the compressors from its drive connection. The multiple compressors are preferably attached to opposite ends of a common motor shaft extending from both ends of the motor. Multiple compressors may be arranged to operate in parallel flow relationship or in series flow relationship in a single refrigerant circuit. The compressors may also be installed on separate refrigerant circuits. In a series flow relationship, a vapor or liquid injection function may be provided. Both compressors may be of an open-drive design, or one of the compressors may share a common housing with the motor.
WO20013868 discloses about an auxiliary power unit for provide power and HVAC to a vehicle. The auxiliary power unit is mounted to the vehicle in a variety of ways, but such that it can be readily moved away from the vehicle for service and maintenance. The power unit has a removable condenser and fan assembly that can be mounted to the power unit to remote from the human occupied portion of the vehicle. The power unit also including a programmable engine control unit for controlling and monitoring various aspects of the operation of the power unit and the vehicle. The power unit having a user interface that enables in-vehicle control of the engine control unit and remote control the engine control unit. The Engine control unit monitoring when excessive a power requirement of the power unit exists and limiting the air conditioning services of the power unit until the excessive power requirements no longer exists.
EP1985481 discloses about a provides a new and improved heating, ventilating, and air conditioning (HVAC) system for an over-the-road vehicle that may be operated regardless of the operational state of the engine. That is, the instant invention provides a new and improved HVAC system that may be

operated to condition the interior compartments of an over-the road vehicle while the engine is running and while the engine is in a no-idle (off) condition. In general, the HVAC system efficiently shares one or more typical air conditioning components with those already found in the vehicle. In one instance, the HVAC system operates an electrically-driven compressor when a belt-driven compressor is idle. In another embodiment, the HVAC system operates both an electrically-driven compressor and a no-idle condenser when a belt-driven compressor and condenser are idle. In yet another embodiment, the HVAC system shares an evaporator.
In brief the HVAC system in the prior art operates an electrically-driven compressor (106) when a belt-driven compressor (108) is idle. In another case, the HVAC system operates both an electrically-driven compressor (106) and a no idle condenser (160) when a belt-driven compressor (108) and condenser (110) are idle. In yet another embodiment, the HVAC system shares an evaporator (162) between an engine-driven primary air conditioning circuit (104) and an electrically-driven secondary air conditioning circuit (164)
D4: US20070186573 discloses about an efficiency of a dual drive compressor for an air conditioner in a hybrid vehicle having an internal combustion engine and an electric motor is enhanced by calculating compressor load for the air conditioner and then determining allowable engine-off time for the internal combustion engine. Once the engine is turned off, a time counter is started. The engine is thereafter turned on once the time counter indicates that an allowable engine-off time has elapsed. During the cycle, the engine is forced to remain on until minimum "engine-on" time has elapsed. The A1C compressor load is calculated using compressor capacity, engine speed, and/or air conditioner high pressure as input parameters.

In brief the system in the prior art operates air conditioner on an internal combustion engine and an electric motor is enhanced by calculating compressor load for the air conditioner.
The inventions in the cited prior arts are not using mechanical device to draw power from the engine and uses the mechanical drive to drive an AC compressor system.
OBJECT OF INVENTION
The main object of the present invention is to provide gear box PTO driven AC compressor system.
Another object of the present invention is to provide a gear box PTO driven AC compressor system which is compact in size, simple in construction and cost effective.
Yet another Object of the present invention is to provide a gear box PTO driven AC compressor system which runs the AC compressor at desired level with help of engine power.
STATEMENT OF INVENTION
Gear box Power Take Off (PTO) driven AC compressor system comprises; gear box fitted with PTO, electromechanical arrangement means for controlling the said PTO, propeller shaft is provided between said PTO and bearing block for power transmission , said bearing block comprises at least two bearings , a shaft with at least two coupling flanges at each end and said shaft is mounted on a first bracket with hex screw, bearing block pulley from which twin V belt transmits power to the compressor unit which is connected with compressor pulley, second bracket provided for rigidly mounting said compressor unit with suitable fastener means ,plate member for mounting said compressor unit, third

bracket for mounting handle unit, said compressor unit connected to evaporator and condenser to complete the cycle.
Gear box PTO driven AC compressor system, in accordance with this invention, wherein one of said coupling flange is connected to the said PTO. Gear box PTO driven AC compressor system, in accordance with this invention, wherein one end of said coupling flange is connected with said auxiliary propeller shaft and at other end another coupling flange is connected which is mounted on said bearing block.
Gear box PTO driven AC compressor system, in accordance with this invention, wherein said compressor unit is mounted on said plate member by bolt and on chassis member by bolt and nuts.
Gear box PTO driven AC compressor system, in accordance with this invention, wherein said plate member comprises slots which facilitates sliding of said compressor unit.
Gear box PTO driven AC compressor system, in accordance with this invention, wherein said handle unit is configured to rotate on third bracket which facilitates the movement of said compressor unit along the said slot to provide the belt tension adjustment.
Gear box PTO driven AC compressor system, in accordance with this invention, wherein said compressor unit is interfaced with said evaporator and condenser unit.
Gear box PTO driven AC compressor system, in accordance with this invention, wherein said evaporator and condenser unit are mounted on the roof of the vehicle body.

SUMMARY OF THE INVENTION
Gear box PTO driven AC compressor system comprises; gear box(l) fitted with PTO(2), electromechanical arrangement means (3)for controlling the said PTO , auxiliary propeller shaft (5) is provided between said PTO and bearing block(6) for power transmission , said bearing block comprises at least two bearings , a shaft with at least two coupling flanges at each end and said shaft is mounted on a first bracket(7) with hex screw(8), bearing block pulley(9) from which twin V belt (1 l)transmits power to the compressor unit (14)which is connected with compressor pulley(13), second bracket(16) provided for rigidly mounting said compressor unit (14)with suitable fastener means ,plate member(19) for mounting said compressor unit, third bracket(20) for mounting handle unit, said compressor unit, evaporator and condenser are connected to complete the cycle.
Said compressor unit is mounted on chassis member with bolt and nuts and
said compressor unit is mounted on a plate with bolts.
Said plate member comprises slots which facilitates sliding of said compressor
unit.
Said handle unit is configured to rotate on said third bracket which facilitates
the movement of said compressor unit along the said slot to provide the belt
tension adjustment.
Said compressor unit is interfaced with said evaporator and condenser unit.
Said evaporator and condenser unit are mounted on the roof of the vehicle
body.
BRIEF DESCRIPTION OF DRAWINGS
Figure 1 - shows the arrangement diagram of AC compressor drive
arrangement system.
Figure- 2 shows the details of AC compressor.
Figure-3 shows bearing block and mounting bracket.

Figure-4 shows bearing block and mounting bracket on chassis member. Figure-5 shows compressor mounting on bracket with chassis member.
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-1 to 5, Gear box PTO driven AC compressor system comprises; gear box(l) fitted with PTO(2) , electromechanical arrangement means(3) for controlling the said PTO(2) , auxiliary propeller shaft (5) is provided between said PTO(2) and bearing block (6) for power transmission , said bearing block(6) comprises at least two bearings , a shaft with at least two coupling flanges at each end and said shaft is mounted on a first bracket(7) with hex screw(8), one of said coupling flange is keyed on to said PTO (2). The said coupling flange is connected with said auxiliary propeller shaft (5) at one end and at other end another coupling flange is connected which is mounted on said bearing block (6),the other side of the said bearing block is fixed with the said coupling flange and said bearing block pulley(9) from which twin V belt(ll) transmits power to the compressor unit(14) which is connected with compressor pulley(13), second bracket(16) provided for rigidly mounting said compressor unit(14) with suitable fastener means ,plate member (19) for mounting said compressor unit(14), third bracket(20) for mounting handle unit(21), Said compressor unit evaporator and condenser are connected to complete the cycle.
Said compressor unit (14) is mounted on said second bracket (16) with proper dampening arrangement. The said bracket is fixed on the chassis member of vehicle with bolt and nuts ensuring the said pulley groove alignment and said compressor unit is mounted on a plate member (19) with bolts.

Said plate member (19) comprises slots which facilitates sliding of said compressor unit (14).
Said handle unit (21) is configured to rotate on said third bracket (20) which facilitates the movement of said compressor unit (14) along the said slot to provide the belt tension adjustment.
Said compressor unit is interfaced with said evaporator and condenser unit. Said evaporator and condenser unit are mounted on the roof of the vehicle body.
Gear box (1) is fitted with said PTO (2). Here power is diverted to said PTO from engine. Engine power is used via gear box PTO to compressor. The compressor is driven through a gear box driven PTO with ratio selected suitably to meet the cooling requirement even at low engine rpm. Engine is used for running the AC compressor via said PTO with ratio as per cooling load requirement. Said PTO engagement and disengagement is controlled by electro mechanical arrangement (3). Adjustable type propeller shaft (5) is provided between said PTO and bearing block (6) for power transmission. The said bearing block (6) is mounted on said first bracket (7) with hex screw (8). The first bracket (7) is connected on chassis with hex screw(lO).
The said bearing block (6) is a power transmission device, which comprises at least two bearings, a shaft with at least two coupling flanges at each end and said shaft is mounted on a first bracket with hex screw. The other end of the said bearing block (6) is fitted with said bearing block pulley (9) and screwed with one of said coupling flange. Pulley diameter is decided to maintain the drive ratio depending on the heat load and engine fly up and idle conditions and compatibility with compressor characteristics.

Twin V- belt (11) is provided for power transmission from bearing block pulley (9) to said compressor unit(14) which is connected with said compressor pulley(13).
The compressor unit is rigidly mounted on a bracket (16) with suitable fastener
means. This complete unit is mounted on chassis with M12 bolt and nuts.
The compressor unit is mounted on a plate (19) with bolts.
The said plate (19) comprises slots on which the compressor unit can slide over
it.
The said handle unit (21) can rotate on said third bracket (20). So due to
screwing action, the compressor unit can move along the slot to provide the
belt tension adjustment.
The evaporator and condenser unit are mounted on roof of the bus body.
The said compressor unit, evaporator and condenser are connected to complete
the air conditioning cycle.
The said evaporator, condenser and compressor unit are connected electrically.
The said compressor unit will work when said bearing block pulley will drive
the said compressor pulley. A switch placed at dashboard will control the
engaging and disengaging of the said PTO.
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.

WE CLAIM
1. Gear box Power Take Off (PTO) driven AC compressor system comprises; gear box (1) fitted with PTO (2), electromechanical arrangement means (3) for controlling the said PTO (2), auxiliary propeller shaft (5) provided between said PTO (2) and bearing block (6) for power transmission, said bearing block (6) comprises at least two bearings, a shaft with at least two coupling flanges at each end and said shaft is mounted on a first bracket (7), bearing block pulley (9) from which twin V belt (11) transmits power to the compressor unit (14) which is connected with compressor pulley (13), second bracket (16) provided for rigidly mounting said compressor unit (14), with suitable fastener ,plate member (19) for mounting said compressor unit (14), third bracket (20) for mounting handle unit, said compressor unit (14) connected to evaporator and condenser to complete the cycle.
2. Gear box PTO driven AC compressor system as claimed in claim 1, wherein one of said coupling flange is connected to the said PTO.
3. Gear box PTO driven AC compressor system as claimed in claim 2, wherein one end of said coupling flange is connected with said auxiliary propeller shaft (5) and at other end another coupling flange is connected which is mounted on said bearing block (6).
4. Gear box PTO driven AC compressor system as claimed in claim 1, wherein said compressor unit (14) is mounted on said plate member (19) by bolt and on chassis member by bolt and nuts.
5. Gear box PTO driven AC compressor system as claimed in claim 1, wherein said plate member (19) comprises slots which facilitates sliding of said compressor unit (14).

6. Gear box PTO driven AC compressor system as claimed in claim 1, wherein said handle unit (21) is configured to rotate on said third bracket (20) which facilitates the movement of said compressor unit (14) along the said slot to provide the belt tension adjustment.
7. Gear box PTO driven AC compressor system as claimed in claim 1, wherein said compressor unit (14) is interfaced with said evaporator and condenser unit.
8. Gear box PTO driven AC compressor system as claimed in claim 1, wherein said evaporator and condenser units are mounted on the roof of the vehicle body.
9. A vehicle comprising gear box PTO driven AC compressor system as claimed in claim 1 to 6.
10. Gear box PTO driven AC compressor system substantially as herein described with reference to accompanying drawings.