FIELD OF THE INVENTION:

This invention relates to a Cover cylinder head with in-built cooling circuit for compact layout to enable coolant flow from the rear side of the engine to the front side of the engine resulting in manpower and cost saving.

BACKGROUND OF THE INVENTION:

In existing longitudinal mounted engines; coolant comes out from rear side of the cylinder head after cooling the cylinder head. From the cylinder head rear side, the hot coolant travels toward the radiator through the thermostat. This coolant passage becomes quite long because the radiator is mounted in the front side of the vehicle. Due to the long coolant passage, layout of the coolant pipes and the hoses becomes difficult when the space is limited in the engine room. Apart from that, this requires lot of additional parts (pipes, gasket, mounting bolts etc.) which increases the complexity of the coolant passage and the need for additional space in the engine room.

This type of layout, because of the long and complex coolant passage from the rear of the cylinder head to the radiator inlet, results in high cost due to the involvement of more number of parts. Since additional parts are required to fix this long coolant passage in the engine portion, more time is required for assembly of these parts and also more space is required in the engine room. Due to long coolant passage, pressure reduction in coolant passage is more which increases the water pump work done.

Efforts have been continuously directed towards the designing of coolant circuit in such a way which is less expensive requiring minimum time for assembly. Some of the patents in this field are as follows:

US 8,056,545 B2 on “Integrated cover and exhaust gas re- circulation cooler for internal combustion engine” highlights the integration of the EGR cooler housing in the cylinder head cover. Water flows in the EGR cooler housing through the cylinder head water jacket and through external cooling.

The invention relates to an integrated engine cover and exhaust gas recirculation cooler for an internal combustion engine includes a cover for enclosing a portion of an engine and an EGR cooler having a housing formed as one piece with the cover. The EGR cooler includes at least one cooler section located within the housing and EGR and bypass valves for controlling the flow of exhaust gas either through the cooler or around the cooler.

This invention claims an integrated cover and exhaust gas recirculation cooler for an internal combustion engine, comprising of cover which further comprising a combination rocker arm cover and lower intake manifold attached to and enclosing a cylinder head of an engine; and an EGR cooler comprising a housing formed as one-piece with said cover.

Summarily Cover 14 is joined with and is one-piece with an EGR cooler housing 18. Cooler housing 18 includes high temperature cooling section 26 and low temperature cooling section 30. A high temperature heat exchanger, 34, is slidably inserted into high temperature cooling section 26, and a low temperature heat exchanger 38 slidably inserted into low temperature cooling section 30.

High temperature cooling section 26 is furnished with higher temperature coolant directly from cylinder head 13, by means of cored or drilled passages (not shown) formed in part in cylinder head 13. Those skilled in the art are familiar with the art of cored passages for moving coolant around an engine. Additionally, those skilled in the art will appreciate in view of this disclosure that low temperature heat exchanger 38 may be supplied with liquid coolant from several alternative types of cooling systems, such as a system including a dedicated pump, reservoir and heat exchanger.

Although there is a cooling circuit in-build in the cylinder head cover however the purpose of this cooling circuit is for EGR cooling. Therefore, this invention is different and does not talk about the coolant flow from the rear side of the engine to the front side of the engine. Though this invention reduces the number of parts and is for compact and reliable layout however the purpose is for layout of EGR cooler not for simplification of cooling pipe layout.

CN203867685U on “LIQUID COOLING EXPLOSIVE MOTOR WITH LIQUID-COOLING CYLINDER COVER AND LIQUID COOLING CYLINDER BODY” is related to the cooling circuit of the cylinder head and the cylinder block assembly. Here the cylinder head is using two water jackets and the cylinder block is using one water jacket. One thermostat valve is used in the output of coolant from cylinder head which can be adjusted to various positions to open & close the various passages.

The utility model relates to a liquid-cooling explosive motor with a liquid-cooling cylinder cover and a liquid-cooling cylinder body. The liquid-cooling explosive motor comprises at least one cylinder cover (2) and the cylinder body (3), at least one integrated type cooling sleeve (2a) is arranged on the at least one cylinder cover (2), a first feeding inlet (4a) used for conveying cooling agents is formed in the inlet side of the cooling sleeve (2a), and a first discharging outlet (5a) used for discharging cooling agents is formed in the outlet side of the cooling sleeve (2a); at least one integrated type cooling sleeve (3a) is arranged on the cylinder body (3) and connected with the cylinder body, a second feeding inlet (4b) for conveying cooling agents is formed in the inlet side of the cooling sleeve (3a), a second discharging outlet (5b) used for discharging cooling agents is formed in the outlet side of the cooling sleeve (3a), and the discharging outlets (5a and 5b) can be connected to the feeding inlets (4a and 4b) to form a cooling agent loop. According to the explosive motor (1), control over a cooling mechanism of the explosive motor is optimal, common thermal management of explosive motor (1) can be controlled, and the requirement for comfortableness can be met especially when the explosive motor is combined with a heater where cooling agents run inside a vehicle.

This cooling circuit has advantage in improvement of emissions, performance, and comfort & fuel economy of vehicle but not for simplification of cooling pipe layout.

This invention does not discuss about the integration of the cooling circuit in the cylinder head cover.

DE102007058439A1 This invention relates to Valve cover/Cylinder head cover for motor vehicle internal combustion engine which has integrated cooling medium flow through volume exhibiting increased surface at internal combustion engine side.

The cover (116) has an integrated cooling medium-flow through volume (118) exhibiting an increase surface at an internal combustion engine-side. A further component to be cooled is accommodated in an area of the cooling medium-flow through volume. The cooling medium-flow through volume is part of a cooling medium flow

In this case, the cover cylinder head has an integral channel for the flow of water from cylinder head side. This integral channel is provided to work as an oil cooler in cylinder head cover side. Bottom side of channel is connected with valve and camshaft side having rib type construction.

Although there is an in-build cooling circuit in cylinder head cover however the main purpose of this circuit is to cool the engine oil in cam room to avoid an external oil cooler. This invention does not disclose the simplification of cooling layout for enabling flow from rear side to front side of the engine.

Hence there still exists a need for an invention for a compact layout of cooling circuit for coolant recirculation in the engine by integrating the coolant pathway with the cylinder cover head.

OBJECTS OF THE INVENTION:

The primary object of the cover cylinder head with in-built cooling circuit is to provide coolant flow from rear side of the engine to the front side of the engine through shortest possible route for coolant flow.

Another object of the invention is to eliminate the need for separate coolant pipes, mounting points, bolts and gaskets.

Still another object of the invention is to reduce the cost, complexity and increase the reliability.

The foregoing has outlined some of the pertinent objects of the invention. These objects should be construed to be merely illustrative of some of the more prominent features and applications of the intended invention. Many other beneficial results can be attained by applying the disclosed invention in a different manner or modifying the invention within the scope of disclosure. Accordingly, other objects and a full understanding of the invention and the detailed description of the preferred embodiment in addition to the scope of the invention are to be defined by the claims taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF ACCOMPANYING DRAWINGS:

Further objects and advantages of this invention will be more apparent from the ensuing description when read in conjunction with the accompanying drawings and wherein:

Fig. 1: Existing coolant circuit with independent cylinder
Head cover.
Fig. 2: Coolant circuit integrated on cylinder head Cover-present invention

While the invention is described in conjunction with the illustrated embodiments, it is understood that it is not intended to limit the invention to such embodiments. On the contrary, it is intended to cover all alternatives, modifications and equivalents which may be included within the spirit and scope of the invention disclosure as defined by the claims.

STATEMENT OF THE INVENTION:

According to the invention, there is provided a cylinder head cover with in-built cooling circuit of length ranging from 250 mm to 400 mm and the diameter ranging from 20 mm to 30 mm for a lessor pressure drop in coolant passage wherein the proximal end of the cooling circuit, to radiator, is attached by means of connecting hose to radiator inlet to facilitate coolant flow to the radiator and the distant end of the cooling circuit is connected to the thermostat through connecting hose to allow the coolant to directly enter into the cylinder head cover after leaving thermostat.

DETAILED DESCRIPTION OF THE INVENTION:

At the outset of the description, which follows, it is to be understood that the ensuing description only illustrate a particular form of the invention. However, such a particular form is only an exemplary embodiment and the teachings of the invention are not intended to be taken restrictively.

For the purpose of promoting an understanding of the principles of the invention, reference is now to be made to the embodiments illustrated and the specific language would be used to describe the same. It is nevertheless to be understood that no limitations of the scope of the invention is hereby intended on such alterations and further modifications in the illustrated bag and such further applications of the principles of the invention as illustrated therein being contemplated as would normally occur to one skilled in the art to which the invention relates.

The embodiments are described with reference to the drawings in which like parts are referred to by like numerals. These embodiments are for illustrative purpose only and it should be noted that invention is not limited to the embodiments illustrated in the drawings. Certain details, e.g. manufacturing / assembly details, have been omitted since they are not necessary to understand product functioning.

As used herein and subsequently in the claims, the singular form ‘a’, ‘an’, and ‘the’ includes plural reference unless the context clearly indicates otherwise.

Figure 1 shows the current circulation of coolant wherein the coolant enters the front side of the cylinder head and exits from the rear side of the cylinder head and after flowing from the thermostat the coolant flows towards the radiator’s inlet.

Figure 2 shows the present invention wherein in-built cooling passage is integrated with the cylinder head cover to enable coolant flow from rear side of the engine to the front side of the engine. This in-built cooling passage eliminated the need for separate coolant pipes, mounting points, bolts and gaskets thereby having advantage to reduce layout complexity. With the instant invention, it is possible to eliminate parts and simplify the layout which results in costs and space saving in engine rooms.

The invention relates to cylinder head cover, of motor vehicle internal–combustion engine, with in-built cooling circuit of length ranging from 250mm to 400mm and diameter ranging from 20mm to 30mm for a lessor pressure drop in coolant passage. The water comes out from cylinder head coolant gallery (from rear side) & after thermostat directly enters into the cylinder head cover with the help of connecting hose at rear side. In cylinder head cover in-built coolant passage has been created to facilitate the flow of coolant from rear side to front side of the engine. From cylinder head cover, one hose is attached to radiator inlet to facilitate coolant flow from cover to radiator in a shortest possible route.

This novel invention has resulted in the following advantages:

• Compact layout which requires less number of parts therefore has cost advantage & space saving.

• Easy assembly process due to less number of parts and pieces, including connectors, hoses, brackets and other devices, required to build an engine, thereby reducing the complexity while improving reliability.

• Less pressure drop in coolant passage due to shorter route of coolant flow.

It is to be noted that the present invention is susceptible to modifications adaptations changes by those skilled in the art. Such various embodiments employing the concepts and features of this invention are intended to be within the scope of the present invention which is further set forth under the claims.

WE CLAIM:

1. A cylinder head cover with in-built cooling circuit of length ranging from 250 mm to 400 mm and the diameter ranging from 20 mm to 30 mm for a lessor pressure drop in coolant passage;

2. The cylinder head cover with in built cooling circuit as claimed in claim 1 wherein the proximal end of the cooling circuit, to radiator, is attached by means of connecting hose to radiator inlet to facilitate coolant flow to the radiator;

3. The cylinder head cover with in built cooling circuit as claimed in claim 1 wherein the distant end of the cooling circuit is connected to the thermostat through connecting hose to allow the coolant to directly enter into the cylinder head cover after leaving thermostat.