Claims:We Claim:

1. A system for cooling rear engine of the vehicle, the system comprising:
a radiator mounted on rear side of the vehicle, the radiator having an inlet hose and outlet hose;
a degassing tank connected to the radiator inlet hose;
a exhaust gas recirculation (EGR) unit connected to the radiator outlet hose;
a heater core mounted on front side of the vehicle;
a demister configured around the heater core;
a heater circuit connecting the radiator to the degassing tank, the EGR and the heater core;
a water pump configured on the heater circuit for circulating the coolant;
a thermostat configured on the heater circuit; and
a breather port with a cap configured on a water pump inlet, the breather cap allows the air to escape therethrough during the idle and max torque condition thereby allowing flow of coolant through the heater circuit..

2. The system as claimed in claim 1, wherein the breather port with a cap is positioned at the same level of the degassing tank.

3. The system as claimed in claim 1, wherein the breather port is in open position to force out the trapped air in the heater circuit during the idle and max torque condition of the filling and de-aeration test.

4. The system as claimed in claim 1, wherein the breather port (80) is closed with the cap after the idle and max torque condition to allow the system to get de-aerated during the max speed condition.
, Description:Field of invention

The present invention relates to engines in vehicles and more particularly, the present invention relates to a rear engine cooling system.

Background of the invention

Generally in engine cooling system, coolant is filled either in a radiator if it is recovery system or in a degassing tank if it is degassing system. In certain vehicles, for example in a minivan, the cooling system is placed in extreme rear end of the vehicle and heater core placed in vehicle front cabin. In such vehicles, the heater circuit routing is complex and approx. 3 meter away from the engine. Thus coolant filling in the radiator and removal of air from the heater system is very challenging to achieve de-aeration.

Also, there is no priming in a water pump due to air bubbles coming from heater circuit and occupying the pump. As, there is no flow in through the coolant circuit, an air lock is created in the water pump during filling and de-aeration test.

The figure 4 of the prior art shows that there is no priming in the pump and the coolant flow is stagnant. There is also no flow through heater unit at idle and Max torque condition during filling and de-aeration test.

Accordingly, there exists a need to provide a system for cooling rear engine of the vehicle which overcomes abovementioned drawbacks.

Objects of the present invention

An object of the present invention is remove air from the heater system of vehicle having cooling system placed in extreme rear end of the vehicle and heater core placed in vehicle front cabin.

Another object of the present invention is to improve pump performance cooling in vehicles having cooling system placed in extreme rear end of the vehicle and heater core placed in vehicle front cabin.

Summary of the invention

Accordingly, the present invention provides a system for cooling rear engine of the vehicle. The system comprises a radiator mounted on rear side of the vehicle. The radiator includes an inlet hose and outlet hose. Further, the system comprises a degassing tank connected to the radiator inlet hose, a exhaust gas recirculation (EGR) unit connected to the radiator outlet hose, a heater core mounted on front side of the vehicle, a demister configured around the heater core, and a heater circuit connecting the radiator to the degassing tank, the EGR and the heater core.

The system furthermore comprises a water pump configured on the heater circuit for circulating the coolant, a thermostat configured on the heater circuit, and a breather port with a cap configured on a water pump inlet. The breather port in open position allows the air to escape therethrough during the idle and max torque condition, and fine air bubbles gets de-aerated during the max speed condition after the cap of the breather port is closed.

Brief description of the figures

The objectives and features of the present invention will be more clearly understood from the following description of the invention taken in conjunction with the accompanying drawings, wherein,

Figure 1 shows a layout of a cooling system for cooling rear engine of the vehicle;

Figure 2 shows heater and cooling system position in a vehicle having cooling system is placed in extreme rear end of the vehicle and heater core placed in vehicle front cabin;

Figure 3 shows a cooling system and heater routing in a vehicle having cooling system is placed in extreme rear end of the vehicle and heater core placed in vehicle front cabin;

Figure 4 shows an engine running at idle and max torque speed during de-aeration test with the cooling system of the prior art;

Figure 5 shows an engine running at idle and max torque speed during de-aeration test with cooling system in accordance with the present invention (breather cap open); and

Figure 6 shows an engine running at idle and max torque speed during de-aeration test with cooling system in accordance with the present invention (breather cap closed).

Detailed description of the present invention:

The foregoing objects of the present invention are accomplished and the problems and shortcomings associated with the prior art, techniques and approaches are overcome by the present invention as described below in the preferred embodiment.

The present invention provides a system for cooling rear engine of the vehicle, specifically, for the vehicles having cooling system placed in extreme rear end of the vehicle and heater core placed in vehicle front cabin. The system of the present invention removes air from the heater system and improves pump performance.

For the better understanding of this invention, reference would now be made to the embodiment illustrated in greater depth in the accompanying figures and description herein below, further, in the following figures, the same reference numerals are used to identify the same components in various views/figures.

Referring now to figures 1, 2, 3, 5 and 6, there is shown a system (100) for cooling rear engine of the vehicle, in accordance with the present invention. The system (100) is also described along with references made in figures of the prior art. The system (100) comprises a radiator (10) mounted on rear side of the vehicle. The radiator (10) comprises an inlet hose (12) and an outlet hose (14). The radiator (10) cools the liquid passing therethrough and includes a coolant therein.

The system (100) further comprises a degassing tank (20) connected to the radiator inlet hose (12). The degassing tank (20) removes gases from the coolant The system (100) also comprises an exhaust gas recirculation (EGR) unit (30) connected to the radiator outlet hose (14).The the exhaust gas recirculation (EGR) unit (30) recirculates a portion of an engine's exhaust gas back to the engine cylinders.

The system (100) furthermore comprises a heater core (40) mounted on front side of the vehicle and a demister (50) configured around the heater core (40). The heater core (40) is used in heating the cabin of a vehicle. The demister (50) clears condensation and thaw frost from the windshield, back glass, and/or side windows of a motor vehicle.

The system (100) also comprises a water pump (60) configured on the heater circuit for circulating the coolant and a thermostat (70) configured on the heater circuit. The water pump (60) pushes the coolant through the car's engine block, the radiator and hoses to get the engine heat away from the system. Further, the thermostat (70) blocks the flow of coolant to the radiator (10) until the engine has warmed up. When the engine is cold, no coolant flows through the engine. Once the engine reaches its operating temperature, the thermostat opens.

The system (100) moreover comprises a heater circuit (not numbered) connecting the radiator (10) to the degassing tank (20), the EGR (30) and the heater core (40).

Specifically, the heater circuit comprises the radiator inlet hose (12) connecting the degassing tank (20), the radiator outlet hose (14) connected to the exhaust gas recirculation (EGR) unit (30), a hose (32) connecting EGR unit (30) to the heater core (40), a hose (42) connecting heater core (42) to the water pump (60), a hose (16) connecting a radiator (30) to the thermostat (70), a hose (18) connecting radiator to water pump (60), a hose (22) connecting the degassing tank (20) to the water pump (60), a bypass hose (72) connecting the thermostat (70) to the water pump (60) as shown in figure 3.

The system (100) is characterized in that the system (100) comprises a breather port with a cap (80) configured on an inlet of the water pump (60).

In preferred embodiment, the breather port with a cap (80) is positioned at the same level of the degassing tank (20) position, which ensures that coolant doesn’t spill out in max torque condition. The breather port with a cap (80) mounted at water pump (60) inlet ensures complete fill without affecting the water pump (60) performance.

Specifically, the figure 5 shows the engine running at idle and max torque speed during de-aeration test, wherein the breather port (80) is open. In this condition, there is priming in the water pump (60) and there is circulation of the coolant flow through the heater circuit. The trapped air in the heater circuit is forced out through the breather port (80) during the idle and max torque condition of the filling and de-aeration test.

The figure 6 shows the engine running at idle and max torque speed during de-aeration test, wherein the breather port (80) is closed with the cap, i.e. after the idle and max torque condition of the filling and de-aeration test. Major air bubbles from the heater circuit are escaped out from the breather port (80) and fine air bubbles are present. When, the cap on the breather port (80) is closed and the system (100) gets de-aerated during the max speed condition within 10 min time.

The foregoing objects of the invention are accomplished and the problems and shortcomings associated with prior art techniques and approaches are overcome by the present invention described in the present embodiment. Detailed descriptions of the preferred embodiment are provided herein; however, it is to be understood that the present invention may be embodied in various forms. Therefore, specific details disclosed herein are not to be interpreted as limiting, but rather as a basis for the claims and as a representative basis for teaching one skilled in the art to employ the present invention in virtually any appropriately detailed system, structure, or matter. The embodiments of the invention as described above and the methods disclosed herein will suggest further modification and alterations to those skilled in the art. Such further modifications and alterations may be made without departing from the spirit and scope of the invention.