DESC:TECHNICAL FIELD
[0001] The present subject matter generally relates to a cylinder head cover, and more particularly, relates to a natural cooling arrangement for a cylinder head cover around a cylinder head in an engine thereof.

BACKGROUND
[0002] Generally, an internal combustion engine converts chemical energy into mechanical energy by combustion of air-fuel mixture within a combustion chamber of the engine of a vehicle. The internal combustion engine, among other components, has a cylinder comprising a cylinder head atop the cylinder that is capable of receiving a reciprocating piston from the bottom. On combustion of the air-fuel mixture, the piston transfers the energy generated during combustion to a crankshaft through a connecting rod, thereby driving the crankshaft. In this way, the reciprocatory motion of the piston is converted to a rotatory motion of the crankshaft which in turn drives the vehicle.

BRIEF DESCRIPTION OF DRAWINGS
[0003] The detailed description is described with reference to the accompanying figures, which is related to a two-wheeled vehicle being one embodiment of the present subject matter. However, the present subject matter is not limited to the depicted embodiment(s) and is applicable to all kinds of vehicle such as two-wheeled vehicle, three-wheeled vehicle, four-wheeled vehicle and the like. In the figures, the same or similar numbers are used throughout to reference features and components.
[0004] Fig. 1 depicts a typical right-side view of an exemplary two-wheeled vehicle in accordance with an embodiment of the present subject matter.
[0005] Fig. 2 illustrates an enlarged general assembly view of an engine in the two-wheeled vehicle in accordance with an embodiment of the present subject matter.
[0006] Fig. 3 illustrates an exploded general assembly view of the essential components of the engine in the two-wheeled vehicle in accordance with an embodiment of the present subject matter.
[0007] Fig. 4 illustrates an isometric top view of a cylinder head cover assembly in the engine of the two-wheeled vehicle in accordance with an embodiment of the present subject matter.
[0008] Fig. 5 illustrates an exploded view of the cylinder head cover assembly in the engine of the two-wheeled vehicle in accordance with an embodiment of the present subject matter.
[0009] Fig. 6 illustrates a top view of the cylinder cover head assembly illustrating imaginary planes in the second cover in accordance with an embodiment of the present subject matter.
[00010] Fig. 7 shows a back view of the cylinder cover head assembly illustrating one or more divergent cut-outs and one or more bulges in a second cover when viewed from a rear side of the two-wheeled vehicle in accordance with an embodiment of the present subject matter.
[00011] Fig. 8 illustrates a bottom view of the cylinder head cover assembly illustrating the divergent cut-outs in the second cover in accordance with an embodiment of the present subject matter.
[00012] Fig. 9 illustrates a left-side view of the second cover in accordance with an embodiment of the present subject matter.
[00013] Fig. 10 illustrates a right-side view of the second cover in accordance with an embodiment of the present subject matter.
[00014] Fig. 11 illustrates a left-side view of the engine along with the cylinder head cover assembly in accordance with an embodiment of the present subject matter.
[00015] Fig. 12 illustrates a right-side view of the engine along with the cylinder head cover assembly in accordance with an embodiment of the present subject matter.
[00016] Fig. 13 illustrates a schematic view of the air flow circulation through one or more divergent cut-outs in the second cover and through a region of a first cover in accordance with an embodiment of the present subject matter.
[00017] Fig. 14 illustrates a cut-section view of the cylinder head cover assembly depicting one or more atmospheric air entrapment zones formed between the first cover and the second cover in accordance with an embodiment of the present subject matter.
[00018] Fig. 15 illustrates a cut-section view of the cylinder head cover assembly depicting the point of contact between the first cover and second cover in accordance with an embodiment of the present subject matter.
[00019] Fig. 16 graphically depicts a temperature vs time graph showing the decrease in temperature of the cylinder cover head assembly due to natural cooling arrangement being achieved through the second cover in accordance with an embodiment of the present subject matter.
DETAILED DESCRIPTION
[00020] Exemplary embodiments detailing features of the cylinder head cover assembly for an engine in a two-wheeled vehicle, in accordance with the present invention will be described hereunder with reference to the accompanying drawings. Various aspects of different embodiments of the present invention will become discernible from the following description set out hereunder. Rather, the following description provides a convenient illustration for implementing exemplary embodiments of the invention. Further, it is to be noted that terms “upper”, “lower”, “right”, “left”, “front”, “forward”, “rearward”, “downward”, “upward”, “top”, “bottom” and like terms are used herein based on the illustrated state or in a standing state of the two-wheeled vehicle with a driver riding thereon. Furthermore, a vehicle longitudinal axis refers to a front to rear axis relative to the two-wheeled vehicle, while a vehicle lateral axis refers to a side to side, or left to right axis relative to the two-wheeled vehicle. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.
[00021] According to a preferred embodiment, an internal combustion (IC) engine is described herein that operates in four cycles. However, the scope of the present subject matter is not limited to only IC engines but is applicable to all kinds of engine or any power generating unit. The IC engine is installed in a two-wheeled vehicle. It is pertinent to note that the IC engine may be mounted in two-wheeled vehicles in different arrangements such as in transverse and longitudinal fashion. However, in the ensuing description, such engine is transversely mounted at a lower portion of the two-wheeled vehicle. It is contemplated that the concepts of the present subject matter may be applied to other types of vehicles and other types of engines within the spirit and scope of this subject matter. Thus, it is also to be understood that the scope of the present invention is not limited to only IC engines in a two-wheeled vehicle; however might be applicable to any power generating unit or engines having a cylinder cover head in any type of vehicle such as two-wheeled vehicles, three-wheeled vehicles, four-wheeled vehicles and the like. The detailed explanation of the constitution of parts other than the present subject matter which constitutes an essential part has been omitted at suitable places.
[00022] Conventionally, a typical IC engine comprises of a cylinder block that maintains the IC engine's stability and enables lubrication of all the parts of the engine while withstanding a variety of temperatures and loads. Such cylinder block has a cylinder head mounted over it which is used to primarily cool the engine by controlling the air flow in and out of the cylinder blocks, thereby dissipating the heat produced by the engine to produce a cooling effect. The cylinder head further serves as a combustion chamber seal, thereby closing a combustion chamber from top. Moreover, it acts as a mounting structure for various valvetrain components such as the inlet and outlet exhaust valves and ducts, spark plugs, injectors, and a camshaft etc.
[00023] A cylinder head cover sits at the top of the cylinder head and below a fuel tank that seals off the cylinder head space from the outside of the engine. As a result of operation of the IC engine, blow-by gases from the combustion process and oil droplets from the lubricant system of the engine are present inside the cylinder head. These quantities of gas and liquid present in the cylinder head space are usually passed through separating devices and returned to the intake area and/or the oil circuit. Such separating devices for separating the oil components of the blow-by gases are usually mounted in the immediate vicinity of the cylinder head cover or, ideally, they are integrated into the cylinder head cover. Such cylinder head cover mainly covers the upper part of the cylinder head from the side, front and top, and the side surface of the cylinder head cover has a larger shape than the cylinder head when the engine is viewed from the side.
[00024] However, since the cylinder head cover covers and conceals the upper part of the cylinder head, the rate of heat dissipation of the upper part of the cylinder head is deteriorated. For this reason, the cylinder head may be overheated particularly under hot and humid conditions such as in summer, which may adversely affect the IC engine performance. This excessive heat may be further transmitted to the fuel tank which is located above the IC engine which is undesirable. Such excessive heat might further result in wear off of the components inside the engine at a faster rate, thereby requiring frequent replacement of such components, thus affecting the durability and life-time of the engine and its various components.
[00025] Further, since the cylinder head cover fails to cover a camshaft window area, there might arise problems of entry of dust particles and/or water into the cylinder head region through the sides of the camshaft window area located on one of the sides of the cylinder head region in the IC engine while the two-wheeled vehicle is in motion or during rainy season, which results in entering of splashing of water and/or passage of dust particles inside the cylinder head region leading to problems of rusting of the valvetrain components, thereby reducing the longevity and durability of the valvetrain components.
[00026] Moreover, the location of the IC engine including the cylinder head cover in the two-wheeled vehicle is such that it results in a gap generated between the cylinder head cover and the vehicle body and/or the fuel tank, thereby resulting into deterioration of the aesthetic appeal of the entire two-wheeled vehicle. Typically, it is not preferred to enhance the size of the cylinder head cover itself or perform major constructional changes in the cylinder head cover to achieve the objective of increasing aesthetic appeal of the two-wheeled vehicle, since the cylinder head cover includes various lubrication lines that are further connected to a breather circuit for effective separation of blow-by gases from oil-mist generated during the combustion process. The lubrication lines may be hindered, thereby adversely affecting the functioning of the cylinder head cover, breather circuit and eventually the performance of the engine.
[00027] Several attempts have been made to solve the afore-mentioned problem of enhancing the aesthetic appeal of the two-wheeled vehicle by providing a cover head assembly in which at least a part of the cylinder head cover is covered with an overhead cover from above and from the side thereof in order to enhance the aesthetic appeal of the two-wheeled vehicle. Such existing arrangements utilize aesthetically appealing overhead covers that completely covers the cylinder cover head and a set of cooling fins provided on the cylinder block. However, this results in the problem of excessive heat being entrapped in the cylinder head region of the IC engine, since the generated heat is unable to escape in the environment due to presence of the overhead cover completely covering the cylinder head cover along with the cooling fins provided on the cylinder block. Herein, the entrapment of such heat in the cylinder head region adversely affects the functioning and durability of the valvetrain components located inside the IC engine, thereby affecting the performance of the IC engine.
[00028] Further, such overhead cover is mounted onto the cylinder head cover through sides using additional bolts, mounting lugs made up of rubber. This requires constructional design changes and additional mounting arrangements to be provided on the cylinder head cover to engage with the overhead cover while the overhead cover is fastened to the cylinder head cover with several bolts and mounting lugs, and the head of the bolts faces the outer surface of the overhead cover. Since, such bolts are visible from outside, it necessitates the requirement of adopting a specially shaped bolt heads or to apply additional surface treatment to the bolt heads in order to improve the visual appeal of the overhead covers. Moreover, the mounting lugs poses durability issues since due to excessive heat that is trapped inside the cylinder head region might result in wearing off of the mounting lugs that are made up of rubber.
[00029] Moreover, such existing arrangement are prone to generate vibration issues in the cylinder head as the IC engine generates certain amount of vibration while the engine is in running condition which is transferred to cylinder head as well. As the overhead cover has free ends and is mounted on the cylinder head cover with the help of bolts and mounting lugs only, there arises a problem of vibration issues in such overhead covers due to vibrations in cylinder head.
[00030] Additionally, since the upper part of the cylinder head is covered with the cylinder head cover and the overhead cover, it becomes an obstacle while performing routine maintenance inspection work such as inspection and replacement work of valvetrain components including the spark plug. For this reason, the overhead cover along with the cylinder head cover must be removed from the cylinder head for every maintenance inspection, thereby resulting in decreased accessibility to the valve train components such as the spark plug, making it a tedious and time-consuming task, and thus, ultimately leading to the problem of increased serviceability time.
[00031] Thus, there arises a need for providing a natural cooling arrangement for efficient cooling of the cylinder head cover assembly that allows fresh air from the atmosphere without the need of any forced cooling mechanism for effective heat dissipation from the cylinder head cover region and prevents entry of water and/or mud inside the cylinder head region and inside the valvetrain, reduces vibration issues in the cylinder head cover assembly and enhances aesthetic appeal of the two-wheeled vehicle, that further addresses the aforementioned and other problems of the prior art.
[00032] Thus, the present subject matter aims to provide an efficient natural cooling arrangement for cylinder head cover systems that effectively increase the rate of heat dissipation from the cylinder head cover assembly, thereby eliminating the requirement of any forced cooling mechanism, ultimately leading to a cost-effective natural cooling arrangement.
[00033] It is further an aim of the present subject matter to improve the durability of the parts inside the engine including the valvetrain components and cylinder head by allowing ingression of atmospheric air in the cylinder head cover assembly, thereby providing cooling to the various afore-mentioned components inside the engine, thus resulting into increased durability and improved engine performance.
[00034] It further aims to provide a compact packaging structure of the entire vehicle by reducing the amount of heat dissipated towards the fuel tank which is located exactly above the cylinder head cover assembly, thereby enabling the smooth functioning of surrounding parts such as fuel tank.
[00035] Moreover, it aims to eliminate the problem of entry of dust particles/water inside the cylinder head region through the sides of the camshaft window area while the two-wheeled vehicle is in motion or during rainy season, to prevent rusting, thus increasing the durability of the valvetrain components.
[00036] It is yet another aim of the present subject matter to provide a cylinder head cover assembly that is capable of absorbing vibrations generated in the cylinder head due to vibrations in the engine.
[00037] Another aim of the present subject matter is to provide a cylinder head cover assembly that enables easy serviceability and decreases assembly and disassembly time during maintenance operations, thereby increasing the accessibility to the valvetrain components such as the spark plug.
[00038] It further aims to provide an aesthetically appealing cylinder head cover assembly that eliminates the problem of gap that is generated between the cylinder head cover and the vehicle body and/or the fuel tank by providing a cylinder head cover assembly to enhance the visual appeal of the entire two-wheeled vehicle. Such aesthetically appealing cylinder head cover assembly further aims to address the problem of providing a smooth top and side surface view of the cylinder head cover assembly without making any major constructional design changes to the existing cylinder head cover.
[00039] The present subject matter along with all the accompanying embodiments and their other advantages would be described in greater detail in conjunction with the figures in the following paragraphs.
[00040] According to a preferred embodiment of the present subject matter, a cylinder head cover assembly in an engine is disclosed comprising a first cover mounted on a cylinder head. Herein the first cover is configured to essentially surround the cylinder head completely from above, from sides, from front and from rear sides and a second cover which is mounted on the first cover. Such second cover is configured to laterally cover at least one or more parts of the first cover from above, from sides, from front and from rear sides.
[00041] In another embodiment, the second cover is mounted on the first cover in such a manner that a predetermined gap is maintained to form one or more atmospheric air entrapment zones between the first cover and the second cover.
[00042] Further, in yet another embodiment, the second cover is capable of trapping atmospheric air inside at least one of the one or more atmospheric air entrapment zones formed between the first and the second cover during the motion of the two-wheeled vehicle.
[00043] In an embodiment, the second cover comprises a left second cover and a right second cover which covers the at least one or more parts of the first cover from above, from sides and from front and rear.
[00044] In a further embodiment, the left second cover includes a circular portion on an outer edge of the left second cover that substantially covers a camshaft window provided in the IC engine.
[00045] In yet another embodiment, the right second cover is provided with a recess provision on an outer edge of the right second cover to accommodate a spark plug of the IC engine.
[00046] In another embodiment, the second cover is mounted on the first cover using at least one attachment means including one or more grommets and one or more pins.
[00047] In another embodiment, at least one portion of the one or more grommets is positioned between the first cover and the second cover through at least one or more pins. Herein, the first cover comes in contact with the second cover only through the grommets and pins.
[00048] In yet another embodiment, the first cover and the second cover are provided with at least one or more mounting holes.
[00049] Another embodiment discloses that at least one of the first cover and the second cover is configured to have one or more bulges on an upper portion of the first cover and the second cover.
[00050] In yet another embodiment, the first head cover and the second head cover are configured to have at least one or more divergent cut-outs to allow ingression of atmospheric air inside the one or more atmospheric air entrapment zones formed through the predetermined gap between the first cover and the second cover.
[00051] In a further embodiment, the one or more divergent-cut outs is provided in a front portion of at least one of the first cover and the second cover in a front – rear direction of the two-wheeled vehicle.
[00052] In another embodiment, the one or more divergent-cut outs is provided in a rear portion of at least one of the first cover and the second cover in a front – rear direction of the two-wheeled vehicle.
[00053] In yet another embodiment, at least one of the first cover and the second cover is positioned above one or more fins extending from the cylinder head.
[00054] In another embodiment, the right second cover is configured to have a length X when measured between an imaginary plane A-A’ passing through an outer edge of the right second cover, and an imaginary plane B-B’ passing through an inner edge of the right second cover, wherein the imaginary planes A-A’ and B-B’ are substantially parallel to each other.
[00055] In yet another embodiment, the left second cover is configured to have a length Y when measured between an imaginary plane C-C’ passing through an outer edge of the left second cover, and an imaginary plane D-D’ passing through an inner edge of the left second cover, wherein the imaginary planes C-C’ and D-D’ are substantially parallel to each other.
[00056] In a further embodiment, the second cover is configured to have a length d1 when measured between the imaginary plane B-B’ and the imaginary plane C-C’, wherein length d1 is a region of the first cover.
[00057] The present subject matter is further described with reference to accompanying figures. It should be noted that the description and figures merely illustrate principles of the present subject matter. Various arrangements may be devised that, although not explicitly described or shown herein, encompass the principles of the present subject matter. Moreover, all statements herein reciting principles, aspects, and examples of the present subject matter, as well as specific examples thereof, are intended to encompass equivalents thereof.
[00058] The cylinder head cover assembly may be implemented in any type of vehicle. However, for the purpose of explanation and by no limitation, the cylinder head cover assembly, and corresponding additional advantages and features are described through the following embodiments. Arrows wherever provided on top right corner of the figure represent direction with respect to vehicle. Arrow F represents forward direction, arrow R represents rearward direction, arrow UW represents upward direction and arrow DW represents downward direction.
[00059] Fig. 1 depicts a typical right-side view of an exemplary two-wheeled vehicle 100 in accordance with an embodiment of the present subject matter. Referring to Fig. 1, the two-wheeled vehicle 100 consists of a fuel tank 112, an IC engine 113, and an exhaust muffler 114. The fuel from the fuel tank 112 that gets inside the IC engine 113 undergoes combustion inside a cylinder head 117 from which mechanical power is generated and it is transferred to a rear wheel 116 which subsequently results in movement of a front wheel 115. Since, combustion of fuel is an exothermic reaction; a large amount of heat is generated in this process. Also as shown in Fig. 1, one end of the exhaust muffler 114 is connected to an exhaust port of the IC engine 113. This exhaust port is located on the cylinder head 117 of said IC engine 113. The exhaust gas passes through a catalytic convertor (not shown in figure) which is placed inside the exhaust muffler 114. Also, due to the combustion process, the temperature of the cylinder head 117 is increased and consequently the IC engine 113 and subsequently the cylinder head 117 attains a very high temperature while the vehicle is in use. A cylinder head cover (not shown in Fig. 1) that sits at the top of the cylinder head 117 further results in increasing the amount of heat inside the cylinder head 117 particularly under hot and humid conditions such as in summer, which may adversely affect the IC engine 113 performance. Such excessive heat might further result in wear off of the components inside the IC engine 113 at a faster rate, thereby requiring frequent replacement of such components, thus affecting the durability and life-time of the engine and its various components.
[00060] Referring to Fig. 2 and Fig. 3 which illustrates an enlarged general assembly view of the IC engine 113 in the two-wheeled vehicle 100 and an exploded view of the IC engine 113 in accordance with an embodiment of the present subject matter, the IC engine 113 comprises the cylinder head 117 over which a first cover 210 is mounted. Such first cover 210 may be called as a cylinder head cover according to an implementation of the present subject matter. The first cover 210 completely covers the upper part of the cylinder head 117 from above, from the sides, from front and from rear, and the side surfaces of the first cover 210 has a larger shape than the cylinder head 117 when the IC engine 113 is viewed from the side. The IC engine 113 further includes a second cover 220 which is mounted on said first cover 210. The said first cover 210 and said second cover 220 is positioned above one or more fins 310 extending from said cylinder head 117. In an embodiment, the IC engine 113 further includes a spark plug 305 located on one of the sides of the IC engine 113.
[00061] Referring to Fig.4 which illustrates an isometric top view of a cylinder head cover assembly in the engine of the two-wheeled vehicle in accordance with an embodiment of the present subject matter, a cylinder head cover assembly 400 is shown. The cylinder head cover assembly 400 includes the first cover 210 which is mounted on the cylinder head 117, wherein said first cover 210 is configured to essentially surround said cylinder head 117 completely from above, from sides, from front and from rear sides and a second cover 220 mounted on said first cover 210, wherein said second cover 220 is laterally covering at least one or more parts of said first cover 210 from above, from sides and from front and rear sides. In an implementation of the present subject matter, the second cover 220 further comprises a left second cover 410 and a right second cover 415 covering said at least one or more parts of said first cover 210 from above, from sides, from front and from rear sides. In yet another implementation of the present subject matter, said first cover 210 and said second cover 220 is provided with at least one or more mounting holes 420.
[00062] Referring to Fig. 5, which illustrates an exploded view of the cylinder head cover assembly 400 in the IC engine 113 of the two-wheeled vehicle 100 in accordance with an embodiment of the present subject matter describing the first cover 210 over which the second cover 220 is mounted using at least one attachment means including one or more grommets 515 and one or more pins 520. Herein, at least one portion of said one or more grommets 515 is positioned between said first cover 210 and said second cover 220 through said at least one or more pins 520. The first cover 210 comes in contact with the second cover 220 only through said one or more grommets 515 and said one or more pins 520, thereby the contact surface area between the first cover 210 and the second cover 220 is kept minimal. The second cover 220 is mounted on first cover 210 using said one or more grommets 515 and said one or more pins 520 placed inside the one or more mounting holes 420.
[00063] Referring to Fig. 5, in another implementation of the present subject matter, at least one of said first cover 210 and said second cover 220 is configured to have one or more divergent cut-outs 510 provided in either a front portion or a rear portion of said first cover 210 and said second cover 220 in a front-rear direction of the vehicle 100. In yet another embodiment, the left second cover 410 is configured to have an outer edge 530 and an inner edge 540. Similarly, the right second cover 415 is configured to have an inner edge 550 and an outer edge 560.
[00064] Further, referring to Fig. 6 that illustrates a top view of the cylinder cover head assembly 400 illustrating imaginary planes in the second cover 220 in accordance with an embodiment of the present subject matter. Herein said right second cover 415 is configured to have a length X when measured between an imaginary plane A-A’ passing through said outer edge 560 of said right second cover 415, and an imaginary plane B-B’ passing through said inner edge 550 of said right second cover 415, wherein said imaginary planes A-A’ and B-B’ are substantially parallel to each other. Moreover, in another embodiment, said left second cover 405 is configured to have a length Y when measured between an imaginary plane C-C’ passing through the outer edge 530 of said left second cover 410, and an imaginary plane D-D’ passing through the inner edge 540 of said left second cover 410, wherein said imaginary planes C-C’ and D-D’ are substantially parallel to each other. In yet another embodiment, said second cover 415 is configured to have a length d1 when measured between said imaginary plane B-B’ passing through inner edge of right second cover 415 and said imaginary plane C-C’ passing through outer edge of left second cover 410 wherein length d1 is a region of said first cover 210. In another embodiment, said length X is less than said length Y. However, in another embodiment, said length Y can be equal to said length Y or said length Y can be greater than said length X depending upon the construction of the cylinder head 117.
[00065] Moreover, referring to Fig. 7, that depicts a back view of the cylinder cover head assembly 400 illustrating said one or more divergent cut-outs 510 and one or more bulges 720 in the second cover 220 when viewed from a rear side of the vehicle 100 in accordance with an embodiment of the present subject matter. Herein, at least one of said first cover 210 and said second cover 220 is configured to have one or more bulges 720 in an upper portion of either of said first cover 210 and said second cover 220. In a preferred embodiment, said left second cover 410 and said right cover 415 of said second cover 220 has one or more bulges 720 on the upper portion of second cover 220.
[00066] Referring to Fig. 8, which illustrates a bottom view of the cylinder head cover assembly 400 showing the one or more divergent cut-outs 510 in said second cover 220 in accordance with an embodiment of the present subject matter. Fig. 8 clearly shows the left second cover 410 and said right cover portion 415 having said recess provision 405 includes said one or more divergent cut-outs 510. In an embodiment, the first cover 210 may also have said one or more divergent cut-outs 510.
[00067] Referring to Fig. 9-Fig. 12 which illustrates a left-side view of the second cover 220 and a right-side view of the second cover 220 respectively in accordance with an embodiment of the present subject matter, Fig. 9 shows the left second cover 410 that has a circular portion 815 to completely cover a camshaft timing window located inside the cylinder head 117. Such circular portion prevents the entry of dust particles and/or water inside the camshaft timing window region (not shown in figure), the cylinder head 117, and the valvetrain components (not shown in figure) during splashing of water and/or mud during rainy inside, thereby preventing rusting of the components inside the IC engine 113, thus increasing the durability and lifetime of the entire vehicle 100.
[00068] In another embodiment, typically a camshaft needs two bearings to support the rotational movement. In such a mounting arrangement, a small bearing is press fitted to cylinder head 117 and a big bearing is press fit into said camshaft. However in an implementation in the present subject matter, the mounting arrangement of the camshaft, the small bearing side is sliding fit and the big bearing side is press fit into the cylinder head 117.
[00069] Moreover, in another embodiment, a solid woven wire mesh core inside the cover cylinder head 117 is introduced for separating the oil droplets from the blow-by-gases passing through the cover cylinder head 117 to eliminate the problem of blow-by-gases containing oil droplets which might lead to failure of an induction system inside the vehicle 100 in case the oil droplets in the blow by gases enters the induction system.
[00070] Further, Fig. 10 shows the right second cover 415 that has said recess provision 405 which is used to accommodate spark plug 305 of the IC engine 113. The constructional arrangement provided by the present subject matter eliminates the problem of completely removing the cylinder head cover and the over head cover to perform routine maintenance inspection work. Herein, the first cover 210 and the second cover 220 need not be removed to inspect the spark plug 305 as it can be easily inspected from the provision 405. This results in increased accessibility to the valvetrain components, thus reducing the time required for serviceability of the IC engine 113.
[00071] Referring to Fig. 13 that a schematic view of air flow circulation through said one or more divergent cuts 510 in said second cover 220 and through the length d1 which is a region of the first cover 210 and Fig. 14 that illustrates a cut-section view of the cylinder head cover assembly 400 in accordance with an embodiment of the present subject matter is disclosed, while the vehicle 100 is in a state of motion, the second cover 220 is designed in such a manner that allows ingression of atmospheric air inside one or more atmospheric air entrapment zones 920. Such atmospheric air thus passes from the predetermined gap G between the first cover 210 and the second cover 220 as well as through the length d1 through a front portion of the cylinder head cover assembly 400 and goes out through either the rear portion or through the sides of the cylinder head cover assembly 400. Due to said one or more divergent cut-outs 510 and said one or more bulges 720 formed in said second cover 220, the formed one or more air entrapment zones 920 entrap the atmospheric air to enable forced convection inside such predetermined gap G, the hot air rises above and flows out through either the rear portion or through the sides of the cylinder head cover assembly 400, thereby resulting in an enhanced cooling effect due to natural atmospheric air, without requiring any expensive forced air cooling mechanism. Thus, the present subject matter employs a natural cooling arrangement for efficient cooling of the cylinder head cover assembly 400 that allows fresh air from the atmosphere without the need of any forced cooling mechanism for effective heat dissipation from the cylinder head cover region. Also, owing to the shape of the second cover 220 including one or more divergent cut-outs 510 and said one or more bulges 720, the cylinder head cover assembly 400 enhances the aesthetic appeal of the exposed cylinder head 117, thereby eliminating the problem of poor aesthetics of the vehicle 100 with minimal constructional changes in the existing layout of the IC engine 113.
[00072] Referring to Fig. 15 which illustrates a cut-section view of the cylinder head cover assembly 400 depicting the point of contact between said first cover 210 and said second cover 220 in accordance with an embodiment of the present subject matter, discloses that said first cover 210 comes in contact with said second cover 220 only through the one or more attaching means including the one or more grommets 515 and said one or more pins 520. Since, the first cover 210 is in contact with said second cover 220 only through the attaching means, the rate of conduction of heat is comparatively decreased as there is minimal contact between said first cover 210 and said second cover 220. Such minimal contact between the said covers also results in increased area for said one or more air entrapment zones 920 to allow ingression for more air through the cylinder head cover assembly 400, thereby enhancing the rate of dissipation of heat. The said one or more grommets 515 also acts as dampening agents that helps in absorption of the vibrations generated from the IC engine 113 which is transmitted to the cylinder head assembly 400. The mounting holes 420 which fits the one or more pins 520 provides a smooth upper surface to the second cover 220 which provides a visual appeal to the cylinder head cover assembly 400, thereby increasing the aesthetics of the vehicle 100.
[00073] Referring to Fig. 16 that graphically depicts a temperature vs time graph showing the decrease in temperature of said cylinder cover head assembly 400 due to natural cooling arrangement being achieved through implementation of said second cover 220 in accordance with an embodiment of the present subject matter describes that without said second cover 220, the temperature of said cylinder head cover assembly is t1, whereas when the second cover 220 is used along with the first cover 210, the temperature of the cylinder head cover assembly 400 decreases to t2 wherein t1> t2. Thus, it is clearly established that said second cover 220 along with the first cover 210 results in increased rate of heat dissipation using natural cooling arrangement. Thus, the present subject matter provides an efficient natural cooling arrangement for cylinder head cover systems that effectively increase the rate of heat dissipation from the cylinder head cover assembly, thereby eliminating the requirement of any forced cooling mechanism, ultimately leading to a cost-effective natural cooling arrangement.
[00074] It also improves the durability of the parts inside the engine including the valvetrain components and cylinder head by allowing ingression of atmospheric air in the cylinder head cover assembly, thereby providing cooling to the various afore-mentioned components inside the engine, thus resulting into increased durability and improved engine performance.
[00075] It further provides a compact packaging structure of the entire vehicle by reducing the amount of heat dissipated towards the fuel tank which is located exactly above the cylinder head cover assembly, thereby enabling the smooth functioning of surrounding parts such as fuel tank.
[00076] Moreover, it eliminates the problem of entry of dust particles/water inside the cylinder head region through the sides of the camshaft window area while the two-wheeled vehicle is in motion or during rainy season, to prevent rusting, thus increasing the durability of the valvetrain components.
[00077] It further provides a cylinder head cover assembly that is capable of absorbing vibrations generated in the cylinder head due to vibrations in the engine and enables easy serviceability and decreases assembly and disassembly time during maintenance operations, thereby increasing the accessibility to the valvetrain components such as the spark plug.
[00078] It further provides an aesthetically appealing cylinder head cover assembly that eliminates the problem of gap that is generated between the cylinder head cover and the vehicle body and/or the fuel tank by providing a cylinder head cover assembly to enhance the visual appeal of the entire two-wheeled vehicle. Such aesthetically appealing cylinder head cover assembly further addresses the problem of providing a smooth top and side surface view of the cylinder head cover assembly without making any major constructional design changes to the existing cylinder head cover.
[00079] While certain features of the claimed subject matter have been illustrated and described herein, many modifications, substitutions, changes, and equivalents will now occur to those skilled in the art. It is, therefore, to be understood that the appended claims are intended to cover all such modifications and changes that fall within the true spirit of the claimed subject matter.


List of reference signs:
100 vehicle
111 seat
112 fuel tank
113 IC engine
114 exhaust muffler
115 front wheel
116 rear wheel
117 cylinder head
210 first cover
220 second cover
305 spark plug
310 one or more fins
400 cylinder head cover assembly
405 recess provision
410 left second cover
415 right second cover
420 one or more mounting holes
510 one or more divergent cut-outs
515 one or more grommets
520 one or more pins
530 outer edge of left second cover
540 inner edge of left second cover
550 inner edge of right second cover
560 outer edge of right second cover
720 one or more bulges
815 circular portion
920 one or more atmospheric air entrapment zones
A-A’ imaginary plane passing through an outer edge portion of right second cover

B-B’ imaginary plane passing through an inner edge portion of right second cover

C-C’ imaginary plane passing through an inner edge portion of left second cover

D-D’ imaginary plane passing through an outer edge portion of left second cover

G predetermined gap
,CLAIMS:We claim:
1. A cylinder head cover assembly (400) in an engine (113), said cylinder head cover assembly (400) comprising:
a first cover (210) mounted on a cylinder head (117), wherein said first cover (210) being configured to essentially surround said cylinder head (117) completely from above and from sides; and
a second cover (220) mounted on said first cover (210), wherein said second cover (220) being laterally covering at least one or more parts of said first cover (210) from above and from sides.

2. The cylinder head cover assembly (400) as claimed in claim 1, wherein said second cover (220) being mounted on said first cover (210) such that a predetermined gap (G) being maintained forming one or more atmospheric air entrapment zones (920) between said first cover (210) and said second cover (220).

3. The cylinder head cover assembly (400) as claimed in claim 1, wherein said second cover (220) being configured to enable trapping of atmospheric air inside at least one of said one or more atmospheric air entrapment zones (920) formed between said first cover (210) and said second cover (220) during motion of a vehicle (100).

4. The cylinder head cover assembly (400) as claimed in claim 1, wherein said second cover (220) being configured to have a left second cover (410) and a right second cover (415) covering said at least one or more parts of said first cover (210) from above and from sides.

5. The cylinder head cover assembly (400) as claimed in claim 4, wherein said left second cover (410) being configured to have a circular portion (815) on an outer edge (530) of said left second cover (410) substantially covering a camshaft window provided on an engine (113).

6. The cylinder head cover assembly (400) as claimed in claim 4, wherein said right second cover (415) being provided with a recess provision (405) on an outer edge (560) of said right second cover (415), said provision (405) being configured to accommodate a spark plug (305) of said engine (113).

7. The cylinder head cover assembly (400) as claimed in claim 1, wherein said second cover (220) being mounted on said first cover (210) using at least one attachment means including one or more grommets (515) and one or more pins (520).

8. The cylinder head cover assembly (400) as claimed in claim 7, wherein at least one portion of said one or more grommets (515) being positioned between said first cover (210) and said second cover (220) through said at least one or more pins (520).

9. The cylinder head cover assembly (400) as claimed in claim 1, wherein said first cover (210) and said second cover (220) being provided with at least one or more mounting holes (420) to mount using said one or more grommets (515) and said one or more pins (520).

10. The cylinder head cover assembly (400) as claimed in claim 1, wherein at least one of said first cover (210) and said second cover (220) being configured to have one or more bulges (720) on an upper portion of said first cover (210) and said second cover (220).

11. The cylinder head cover assembly (400) as claimed in claim 1, wherein said first head cover (210) and said second head cover (220) being configured to have at least one or more divergent cut-outs (510) to allow ingression of atmospheric air inside said one or more atmospheric air entrapment zones (920) formed through said predetermined gap (G) between said first cover (210) and said second cover (220).

12. The cylinder head cover assembly (400) as claimed in claim 11, wherein said at least one or more divergent-cut outs (510) being provided in a front portion of at least one of said first cover (210) and said second cover (220) in a front – rear direction of said vehicle (100).

13. The cylinder head cover assembly (400) as claimed in claim 11, wherein said at least one or more divergent-cut outs (510) being provided in a rear portion of at least one of said first cover (210) and said second cover (220) in a front – rear direction of said vehicle (100).

14. The cylinder head cover assembly (400) as claimed in claim 1, wherein said at least one of said first cover (210) and said second cover (220) being positioned above one or more fins (310) extending from said cylinder head (117).

15. The cylinder head cover assembly (400) as claimed in claim 4, wherein said right second cover (415) being configured to have a length X when measured between an imaginary plane A-A’ passing through an outer edge (560) of said right second cover (415), and an imaginary plane B-B’ passing through an inner edge (550) of said right second cover (415), wherein said imaginary planes A-A’ and B-B’ are substantially parallel to each other.

16. The cylinder head cover assembly (400) as claimed in claim 4, wherein said left second cover (405) being configured to have a length Y when measured between an imaginary plane C-C’ passing through an outer edge (530) of said left second cover (410), and an imaginary plane D-D’ passing through an inner edge (540) of said left second cover (410), wherein said imaginary planes C-C’ and D-D’ are substantially parallel to each other.

17. The cylinder head cover assembly (400) as claimed in claim 4, wherein said second cover (415) being configured to have a length d1 when measured between said imaginary plane B-B’ and said imaginary plane C-C’, wherein length d1 being a region of said first cover (210).