FIELD OF INVENTION:

The present invention relates to a "Breathing system for an engine", and more particularly to a breathing system for the differential chamber and the main gear box chamber of an internal combustion engine.

BACKGROUND OF INVENTION:

In the conventional breather system, the breather passage employed in an internal combustion engine is formed through the hoses, which are connected to the differential chamber as well as the main gear box chamber for providing breathing requirements of the engine independently.

In such breathing system independent hoses are provided for the differential chamber and the main gear box for satisfying the breathing requirements of the engine. Also the free end of the hoses connecting the differential chamber and the main gear box chamber are let to atmosphere through a lean one way passage means, wherein the chance to entry of water into the breather chamber is not getting arrested.

The entry of water into the breathing system of differential chamber and the main gear box chamber results in reduction of engine performance. Hence there is a need for a breathing system which arrests the water component entry into the breathing system of the differential chamber and the main gear box chamber, which affects the overall engine performance.

Further, the provision of the independent hoses for breathing of differential chamber and the main gear box chamber increases the manufacturing cost of the system.

Therefore, it is necessary to provide a breathing system having a reduction in the engine manufacturing cost.

OBJECT OF INVENTION:

The main object of the present invention is to provide a breathing system in an internal combustion engine which arrests the water component entry into the breathing system of the differential chamber and the main gear box chamber, and thereby improving the overall engine performance.

Another object of the invention is to provide a breather system capable of co-using a breather passage for breathing requirements of differential chamber and the main gear box chamber, and thereby reducing breather passage cost and running air losses, which substantially results in the engine manufacturing cost and increase in engine performance.

SUMMARY OF INVENTION:

The present invention relates to a breathing system for an internal combustion engine which arrests the water component entry into the breathing system of the differential chamber and the main gear box chamber.

The first embodiment of the invention relates to providing a breathing system for an engine, more particularly to breathing system of the differential chamber and the main gear box chamber, wherein the breather passages are connected to the air filter of the engine, thereby arresting the chance of entry of water component into the breather system and at the same time satisfying the breathing requirements of the differential chamber and the main gear box chamber. The provision of connecting the breather passages to the engine air filter reduce the air losses and substantially allows for improving the overall engine performance.

Another embodiment of the present invention is to provide a breather system capable of co-using a breather passage for breathing requirements of differential chamber and the main gear box chamber. A T-joint is provided in the breather passage, wherein one end of the T-joint is connected to the main air filter unit, and the other two ends are respectively connected to the differential chamber and the main gear box chamber of the internal combustion engine. Such connection means enables in reducing the breather passage cost and running air losses, which substantially results in the engine manufacturing cost and also prevents water entry into gear chambers.

BRIEF DESCRIPTION OF THE DRAWINGS:

Figure 1, illustrates a rear pictorial view of the internal combustion engine.

Figure 2, illustrates the front pictorial view of the internal combustion engine.

Figure 3, illustrates a front pictorial view of the T- joint used to connect the air filter unit to the differential chamber and the main gear box chamber of the engine.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS:

This particular engine herein referred to in the present invention can be divided into three major portions. The top portion (T), the middle portion (M) and the bottom portion (B).

The topmost portion of an engine comprises of the cylinder head, the cylinder block and the cylinder components, the mid portion comprises gear box and the shifting arrangement and the bottom portion comprises of the differential housing.

The cylinder head which is mounted at the top of the cylinder block houses the camshaft, the cam, the rocker arms, the valves and the spark plug. The cylinder block comprises of the combustion chamber and the cooling fins. The various associated cylinder components include the piston, the piston pin and the connecting rod. The cylinder is a cylindrical shaped structure fitted in the cylinder block which in turn houses the piston, a round cylindrical component that performs the reciprocating motion inside the cylinder.

The bottom portion of the cylinder block is connected to the crankcase wherein lubricating oil used for lubricating various moving parts of the engine, is stored.

The middle portion (M) of the engine comprises of the gear box and the shifting arrangement. The gear box is placed in the middle portion in the engine crankcase and comprises of the drive shaft or the input shaft and the driven shaft or the output shaft. It also comprises of the clutch housing for engaging and disengaging the power from the engine crankshaft to the drive shaft. A plurality of gears are provided in the drive shaft for respectively engaging with the gears in the driven shaft. The various combinations of engagement of gears in the drive and driven shaft enable us to attain the required speed with respect to the torque characteristics.

The bottommost portion (B) of the engine comprises of the differential chamber.

The said chamber houses the differential gear which is designed to drive a pair of wheels with equal force, whilst allowing them to rotate at different speeds. In vehicles both driving wheels are not allowed to rotate at the same speed. When cornering, the inner wheel needs to travel a shorter distance than the outer wheel, so with no differential, the result is the inner wheel spinning and/or the outer wheel dragging, and this results in difficult and unpredictable handling, damage to tires and roads, and strain on the entire drive train.

Torque is supplied from the engine, via the transmission, to a drive shaft, which runs to the final drive unit and contains the differential. A spiral bevel pinion gear takes its drive from the end of the drive shaft, and is encased within the housing of the final drive unit. This meshes with the large spiral bevel ring gear, known as the crown wheel. The crown wheel and pinion may mesh in hypoid orientation to enable differential action in the differential unit.

In view of the foregoing, the present invention is intended to provide a breathing system (1) with the breather passage employed in an internal combustion engine (6), formed through the hoses (701), (702) and (703) which are connected to the differential chamber (2) as well as the main gear box chamber (3) for providing breathing requirements of the engine. Hereinafter, the preferred embodiments of the present invention will be described in detail.

A differential gear chamber (2) for an internal combustion engine (6) includes a housing in which a driven input shaft is supported. The two output shafts are provided in the differential gear chamber (2), wherein each drives their respective wheel shaft via their conventional rear axle differential. The differential gears depicted are used in order to allow the wheel shafts to rotate at mutually different speeds.

The main gear box chamber (3) is arranged beside the engine block with its axial direction parallel to the axis of the crank shaft. An output of the engine is transmitted from a crank shaft through an input shaft of the main gearbox (3). The engine outputs will be transmitted to the gearbox assembly through a wet type of clutch.

Normally in internal combustion engines, the differential chamber (2) as well as the main gear box chamber (3) is sealed with a sealing means and has an oil reservoir (9) formed therein. The oil in the oil reservoir (9) is scooped up by differential gears (8) provided in the differential chamber (2) to lubricate the gears and bearings.

When the temperature of the engine rises after starting the engine or when the temperature drops after stopping the engine, the inner pressure in the main gear box chamber (3) varies. The pressure variation affects the sealing of the gear box chamber. To prevent the reduction of the sealing effect, a breathing system is provided for adjusting the inner pressure.

In order to accomplish the foregoing object of the present invention, the first embodiment of the invention relates to providing a breathing system (1) for an engine, more particularly to breathing system of the differential chamber (2) and the main gearbox chamber (3), wherein the breather hoses are connected to the air filter (5) of the engine (6), thereby arresting the chance of entry of water component into the breather system and at the same time satisfying the breathing requirements of the differential chamber (2) and the main gear box chamber (3).

As the temperature rises after starting the engine, the air in the differential chamber (2) and the main gear box chamber (3) expands. Since the air passes through the breather passage, and further into the breather chamber through the breather hoses (4), the air discharges into the atmosphere through the air filter unit (5).

According to this preferred embodiment, the provision of connecting the breather passages to the engine air filter (5) reduces the air losses and substantially allows for improving the overall engine performance and prevents entry of dust and water into the engine arid the differential chamber (2).

Another embodiment of the present invention is to Provide a breathing system (1) capable of co-using a breather passage for breathing requirements of the differential chamber (2) and the main gear box chamber (3). A T- joint (7) is provided in the breather passage, wherein one end of the T-joint (7) is connected to the main air filter unit (5), and the other two ends are respectively connected to the differential chamber (2) and the main gear box chamber (3) of the internal combustion engine (6).

In a further preferred embodiment of the present invention, the provision of such connection enables in reducing the breather passage cost and running air losses, which substantially results in the engine manufacturing cost and also increases the engine overall performance.

Figure 1, illustrates the rear view of the engine (6) comprising of the main gear box chamber (3) and the differential chamber (2) sealed with sealing means and provided with an oil reservoir (9) formed therein. The said chambers are provided with a first breather hose (701), one end of which is connected to the outlet passage of the differential chamber (2) and a second breather hose (702), one end of which is connected to the main gear box chamber (3). The free ends of the said hoses (701) and (702) are further connected to a T-joint (7) formed therein. A third breather hose (703) whose one end is connected to the said T- joint (7) has its other end coupled to the main air filter unit (5) of the said engine.

Figure 2, illustrates the front view of the engine (6) with three breather hoses (701), (702) and (703) connected to the T- joint (7) respectively. The third breather hose is coupled to the lowermost portion of the main air filter unit (5) of the engine (6).

Figure 3, illustrates the front view of the T- joint (7) provided in the breather passage, wherein one end of the T- joint (7) is connected to the main air filter unit (5) and the other two ends are respectively connected to the differential chamber (2) and the main gear box chamber (3) of the internal combustion engine (6).

Although the subject matter has been described with reference to specific embodiments, this description is not meant to be construed in a limiting sense. Various modifications of the disclosed embodiments, as well as alternate embodiments of the subject matter, will become apparent to persons skilled in the art upon reference to the description of the subject matter. It is therefore contemplated that such modifications can be made without departing from the spirit or scope of the present subject matter as defined.

I/We Claim:

1) Breathing system for an engine comprising:

an integrated differential chamber attached integrally to the said engine consisting of a main gear box chamber and a differential chamber separated by a wall such that they form a separate housing to hold different quality of lubricating oils and operate differently; said main gear box chamber and differential chamber are provided with breathing passages with an outlet tube to vent the oil and air mixture to the atmosphere independently, wherein the said outlet tube from the differential chamber is connected to a breather hose and the outlet tube from the main gear box is connected to another breather hose, said breather hoses are connected to a T- joint at either ends, the other end of the T- joint is connected to the main air filter through a hose.

2) The breathing system for an engine as herein substantially described
and illustrated with reference to the accompanying drawings.