DESC:TECHNICAL FIELD
[001] The embodiments herein generally relate to internal combustion engines and more particularly, but not exclusively to cylinder head having single piece water jacket in internal combustion engines.

BACKGROUND
[002] Generally, an engine of a vehicle is cooled to keep the engine running at optimum temperature by extracting the heat generated in the engine. The two types of engine cooling are air cooling and water cooling. In air cooled engines, cooling is done by passing air over the fins that are provided externally on a cylinder block of the engine whereas in water cooled engines, cooling is done by circulation of water inside the engine. A conventional cylinder head having two valves per cylinder configuration with cross flow type port arrangement usually has a two piece water jacket with a machined hole in the water jacket for allowing the flow of water there through to cool corresponding exhaust valve and corresponding fuel injector. The machining operation of the hole may lead to leakages of coolant thereby resulting in breakdown of the cooling system. The aforementioned cylinder head having two piece water jackets is usually complex in design and incurs high manufacturing costs. Further, the aforementioned cylinder head is subjected to high pressure drop due to usage of longer length external hoses/pipes, low heat transfer co-efficient resulting in usage of higher capacity exhaust gas re-circulation (EGR) cooler and less efficient cabin heater.
[003] Therefore, there exists a need for a cylinder head for an engine, which obviates the aforementioned drawbacks.

OBJECTS
[004] The principal object of an embodiment of this invention is to provide a cylinder head for an engine, which comprises a single piece coolant jacket having at least one coolant passage configured to be integrated with the coolant jacket for cooling corresponding exhaust valve and corresponding fuel injector of the engine.
[005] Another object of an embodiment of this invention is to provide a cylinder head for an engine, which has reduced pressure drop and better heat transfer co-efficient.
[006] These and other objects of the embodiments herein will be better appreciated and understood when considered in conjunction with the following description and the accompanying drawings. It should be understood, however, that the following descriptions, while indicating embodiments and numerous specific details thereof, are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the embodiments herein without departing from the spirit thereof, and the embodiments herein include all such modifications.

BRIEF DESCRIPTION OF DRAWINGS
[007] The embodiments of the invention are illustrated in the accompanying drawings, throughout which like reference letters indicate corresponding parts in the various figures. The embodiments herein will be better understood from the following description with reference to the drawings, in which:
[008] FIG. 1 depicts a transparent perspective view of a portion of an engine, according to an embodiment of the invention as disclosed herein;
[009] FIG. 2 depicts a transparent top view of a cylinder head of the engine, according to an embodiment of the invention as disclosed herein;
[0010] FIG. 3 depicts a transparent right side view of the cylinder head adjacent to an exhaust side of the engine, according to an embodiment of the invention as disclosed herein;
[0011] FIG. 4 depicts a right side view of a coolant jacket of the cylinder head adjacent to the exhaust side of the engine, according to an embodiment of the invention as disclosed herein;
[0012] FIG. 5 depicts a left side view of the coolant jacket of the cylinder head adjacent to an intake side of the engine, according to an embodiment of the invention as disclosed herein;
[0013] FIG. 6 depicts a top view of the coolant jacket of the cylinder head, according to an embodiment of the invention as disclosed herein; and
[0014] FIG. 7 depicts a cross-sectional view of the cylinder head, according to an embodiment of the invention as disclosed herein.

DETAILED DESCRIPTION
[0015] The embodiments herein and the various features and advantageous details thereof are explained more fully with reference to the non-limiting embodiments that are illustrated in the accompanying drawings and detailed in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.
[0016] The embodiments herein achieve a cylinder head for an engine, which comprises a single piece coolant jacket having at least one coolant passage configured to be integrated with the coolant jacket for cooling corresponding exhaust valve and corresponding fuel injector of the engine. Referring now to the drawings, and more particularly to FIGS. 1 through 7, where similar reference characters denote corresponding features consistently throughout the figures, there are shown embodiments.
[0017] FIG. 1 depicts a transparent perspective view of a portion of an engine 10, according to an embodiment of the invention as disclosed herein. In an embodiment, the engine 10 includes a cylinder head 100 (as shown in fig. 1, fig. 2, fig. 3 and fig. 7), a plurality of exhaust valves V, a plurality of fuel injectors J, an intake side I (as shown in fig. 1, fig. 2, fig. 5 and fig. 6), an exhaust side E (as shown in fig. 1, fig. 2, fig. 3 and fig. 4), a cylinder block (not shown), a plurality of hydraulic lash adjustors (not shown) and may include other standard components as present in standard engine.
[0018] FIG. 2 depicts a transparent top view of a cylinder head 100 of the engine 10, according to an embodiment of the invention as disclosed herein. The cylinder head 100 is removably connected to the cylinder block (not shown) of the engine 10. In an embodiment, the cylinder head 100 includes a coolant jacket 102 (fig. 1, fig. 2, fig. 3, fig. 4, fig. 5 and fig. 6), a plurality of exhaust valve receiving portions 104 (as shown in fig. 2 and fig. 7), a plurality of fuel injector receiving portions 106 (as shown in fig. 2 and fig. 7) and may include other standard portions/elements as present in standard cylinder head. The coolant jacket 102 is adapted to facilitate the circulation of coolant therethrough to cool corresponding portions of the cylinder head 100 or corresponding parts of the engine 10. In an embodiment, the coolant jacket 102 includes a plurality of coolant inlets 102i (as shown in fig. 3 and fig. 4), a first portion 102f (as shown in fig. 2, fig. 3, fig. 4 and fig. 6), a plurality of coolant passages 102p (as shown in fig. 1, fig. 2, fig. 5, fig. 6 and fig. 7), a second portion 102s (as shown in fig. 2, fig. 5 and fig. 6), a plurality of coolant outlets 102o (as shown in fig. 5), a first outlet 102b (as shown in fig. 2 and fig. 6) and a second outlet 102c (as shown in fig. 2 and fig. 6). The plurality of coolant inlets 102i of the coolant jacket 102 are used to facilitate entry of coolant from the cylinder block (not shown) of the engine 10 to the coolant jacket 102 of the cylinder head 100. The plurality of coolant inlets 102i of the coolant jacket 102 are adjacent to the exhaust side E of the engine 10. The first portion 102f is provided in fluid communication with the coolant inlets 102i of the coolant jacket 102. The first portion 102f is between each coolant inlet 102i and each coolant passage 102p and extending along the longitudinal length of the coolant jacket 102. The first portion 102f of the coolant jacket 102 is adjacent to the exhaust side E of the engine 10. The first portion 102f of the coolant jacket 102 is used to facilitate cooling of each hydraulic lash adjustors (not shown). In an embodiment, each coolant passage 102p is configured to be integrated with the coolant jacket 102 i.e., each coolant passage 102p is formed during the casting process of the cylinder head 100. In an embodiment, each coolant passage 102p is disposed between at least a portion of corresponding exhaust valve receiving portion 104 and a portion of corresponding fuel injector receiving portion 106 of the cylinder head 100, where the portion of corresponding exhaust valve receiving portion 104 is adjacent to a valve seat of corresponding exhaust valve V and the portion of the corresponding fuel injector receiving portion 106 is adjacent to a nozzle of corresponding fuel injector J. In an embodiment, each coolant passage 102p includes a first end F (as shown in fig. 2 and fig. 6) and a second end S (as shown in fig. 2 and fig. 6). The first end F of each coolant passage 102p is adapted to be provided in fluid communication with the first portion 102f of the coolant jacket 102, where the first portion 102f is adjacent to the exhaust side E of the engine 10. The second end S of each coolant passage 102p is adapted to be provided in fluid communication with the second portion 102s of the coolant jacket 102, where the second portion 102s is adjacent to the intake side I of the engine 10. Each coolant passage 102p is adapted to allow the flow of coolant there through to facilitate cooling of corresponding exhaust valve V and corresponding fuel injector J i.e., each coolant passage 102p is adapted to allow the coolant from the first portion 102f to flow to the second portion 102s of the coolant jacket 102 thereby cooling corresponding exhaust valve V and corresponding fuel injector J. The second portion 102s of the coolant jacket 102 is between the second end S of each coolant passage 102p and each coolant outlet 102o of the coolant jacket 102, and extending along the longitudinal length of the coolant jacket 102. The second portion 102s is provided in fluid communication with the first portion 102f of the coolant jacket 102. The second portion 102s of the coolant jacket 102 is adjacent to the intake side I of the engine 10. The plurality of coolant outlets 102o of the coolant jacket 102 is used to facilitate the exit of coolant from the second portion 102s of the coolant jacket 102 to the cylinder block (not shown) of the engine 10. The first outlet 102b of the coolant jacket 102 is used to facilitate the exit of coolant from the coolant jacket 102 to a cabin heater (not shown) of the vehicle. The first outlet 102b of the coolant jacket 102 is adjacent to the intake side I of the engine 10. The second outlet 102c of the coolant jacket 102 is used to facilitate the exit of coolant from the coolant jacket 102 to an exhaust gas re-circulation (EGR) cooler (not shown) of the engine 10. The second outlet 102c of the coolant jacket 102 is adjacent to the intake side I of the engine 10. The second outlet 102c is substantially transverse to the first outlet 102b of the coolant jacket 102.
[0019] Each exhaust valve receiving portions 104 of the cylinder head 100 is an opening adapted to receive corresponding exhaust valve V. Each fuel injector receiving portions 106 of the cylinder head 100 is an opening adapted to receive corresponding fuel injector J.
[0020] The intake side I of the engine 10 can be considered to be defined by the location of an intake manifold (not shown) of the engine 10 and the exhaust side E of the engine 10 can be considered to be defined by the location of an exhaust manifold (not shown) of the engine 10.
[0021] Each exhaust valve V is received by corresponding exhaust valve receiving portion 104 of the cylinder head. Each exhaust valve V is used to facilitate exit of exhaust gas from the engine 10 to the exhaust manifold (not shown) of the engine 10. Each fuel injector J is received by the corresponding fuel injector receiving portion 106 of the cylinder head 100. Each fuel injector J is used to inject the fuel into the engine 10. Each hydraulic lash adjustor (not shown) is used to maintain zero valve clearance in the engine 10 (maintain clearance between corresponding valve and corresponding rocker or cam follower).
[0022] The coolant flow in the cylinder head 100 is as follows. During operation of the engine 10, the coolant from the cylinder block (not shown) of the engine 10 flows to the first portion 102f of the coolant jacket 102 of the cylinder head 100 through the coolant inlets 102i adjacent to the exhaust side E of the engine 10. Thereafter, the coolant from the first portion 102f flows to the second portion 102s, each coolant passage 102p, the first outlet 102b and the second outlet 102c. The coolant from the second portion 102s of the coolant jacket 102 flows to the cylinder block (not shown) through the coolant outlets 102o of the coolant jacket 102. The coolant from the first outlet 102b of the coolant jacket 102 flows to the cabin heater (not shown) of the vehicle. The coolant from the second outlet 102c of the coolant jacket 102 flows to the EGR cooler.
[0023] The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.
,CLAIMS:CLAIMS
We claim,
1. A cylinder head 100 for an engine 10 having at least one cylinder, said cylinder head 100 comprising:
a coolant jacket 102 having at least one coolant passage 102p configured to be integrated with said coolant jacket 102, the coolant passage 102p adapted to be disposed between at least a portion of corresponding exhaust valve receiving portion 104 and a portion of corresponding fuel injector receiving portion 106 of said cylinder head 100,
wherein
the coolant passage 102p includes a first end F adapted to be provided in fluid communication with a first portion 102f of said coolant jacket 102, where the first portion 102f is adjacent to an exhaust side E of the engine 10, and a second end S adapted to be provided in fluid communication with a second portion 102s of said coolant jacket 102, where the second portion 102s is adjacent to an intake side I of the engine 10; and
the coolant passage 102p is adapted to allow the flow of coolant therethrough to facilitate cooling of corresponding exhaust valve V and corresponding fuel injector J.

2. The cylinder head 100 as claimed in claim 1, wherein the exhaust valve receiving portion 104 of said cylinder head 100 is at least an opening adapted to receive corresponding exhaust valve V.

3. The cylinder head 100 as claimed in claim 1, wherein the fuel injector receiving portion 106 of said cylinder head 100 is at least an opening adapted to receive corresponding fuel injector J.

4. The cylinder head 100 as claimed in claim 1, wherein said coolant jacket 102 includes a first outlet 102b adapted to facilitate exit of coolant from said coolant jacket 102 to a cabin heater, wherein the first outlet 102b is adjacent to the intake side I of the engine 10.

5. The cylinder head 100 as claimed in claim 1, wherein said coolant jacket 102 includes a second outlet 102c adapted to facilitate exit of coolant from said coolant jacket 102 to an exhaust gas re-circulation (EGR) cooler, wherein the second outlet 102c is adjacent to the intake side I of the engine 10.

6. The cylinder head 100 as claimed in claim 1, wherein the portion of corresponding exhaust valve receiving portion 104 of said cylinder head 100 is adjacent to a valve seat of corresponding exhaust valve V.
7. The cylinder head 100 as claimed in claim 1, wherein the portion of corresponding fuel injector receiving portion 106 of said cylinder head 100 is adjacent to a nozzle of corresponding fuel injector J.

8. The cylinder head 100 as claimed in claim 1, wherein said coolant jacket 102 is a single piece coolant jacket.

9. The cylinder head 100 as claimed in claim 1, wherein the first portion 102f is between each coolant inlet 102i and each coolant passage 102p of said coolant jacket 102 and extending along the longitudinal length of said coolant jacket 102.

10. The cylinder head 100 as claimed in claim 1, wherein the second portion 102s is between the second end S of each coolant passage 102p and each coolant outlet 102o of said coolant jacket 102, and extending along the longitudinal length of said coolant jacket 102.