Claims:WE CLAIM:
1. A crankcase ventilation system for an inclined internal combustion engine comprising of:
a plurality of cover plates coupled together forming a one or more chamber allowing the separation of oil from blow-by gases, wherein the plurality of cover plates includes a lower plate (107) and an upper plate (108) that is welded to the lower plate (107), and wherein the lower plate (107) welded with the upper plate (108) forms a plurality of chambers where oil and gas are separated.

2. The crankcase ventilation system as claimed in claim 1, comprising an engine cavity (106) having an entry (102) for blow by gases and a drainage hole (104) that is provided at the lowest most point of the engine cavity (106), wherein the engine cavity has no chambers, wherein oil from the engine cavity drains through the drainage hole (104).

3. The crankcase ventilation system as claimed in claim 2 wherein the lower cover plate (107) comprising of:
an entry vent (102) for flow (109) of blow-by gases;
a first chamber (110) receiving the blow-gases from the entry vent (102), with a first guiding rib (111) arranged and configured for guiding oil droplets (112) into a first oil drain (113) located in the first chamber (110);
a second chamber (115) receiving the blow-by gases from the first chamber, with a wall structure (116), wherein the structure (116) configured for impacting flow of blow-by gases towards wall structure (116); a second guiding rib (117) arranged behind the wall structure (116); and a third guiding rib (118) arranged in a horizontal direction below the wall structure (116) configured for guiding oil droplets (112) into a second oil drain (114) located in the second chamber (115),
wherein the entry vent (102) is in line with the entry (102) provided in the engine cavity (106) for blow by gases.
4. The crankcase ventilation system as claimed in claim 2 wherein the upper cover plate (108) comprising of:
a baffle structure (119) arranged corresponding to the first chamber (110) of the lower cover plate (107);
a cut-out portion (120) arranged corresponding to the second chamber (115) of the lower cover plate (107) to accommodate the wall structure (116);
an inclined wall (121) arranged corresponding to the second chamber (115) of the lower cover plate (107) configured for directing flow (109) of impacting blow-by gases;
an exit vent (103) for flow of blow-by gases, wherein the exit vent (103) is in line with the drainage hole (104).

Description:A CRANKCASE VENTILATION SYSTEM

TECHNICAL FIELD
[0001] The present subject matter described herein relates to a crankcase ventilation on a combustion engine. More specifically, the present invention relates to a positive crankcase ventilation structure designed for inclined engine to separate oil mist from blow-by gases.

BACKGROUND
[0002] During internal combustion engine working, combustion gases enter the engine crankcase. Gases are pushed out of the combustion chambers into the crankcase during the working of an internal combustion engine through the gap between the piston rings and the cylinder walls, which are known as blow-by gases. The blow-by gases are deemed to be a complex mixture of air, burned and unburned gases and oil mist. In order to avoid external pollution, the blow-by gases are recycled in the air intake system.
[0003] A positive crankcase ventilation (PCV) system is typically employed to ventilate the crankcase and to recirculate the blow-by gases to the intake side of the internal combustion engine for burning in a combustion chamber of the engine. The pressure in the crankcase is raised by these gases and must, thus be drained away. To prevent emissions of contaminants from the crankcase, the blow-by gas is fed through a vent line in the intake manifold of the internal combustion engine. The PCV system takes advantage of the negative pressure in the engine intake to draw the gases out of the crankcase and into a combustion air supply system associated with the intake side of the engine.
[0004] Particularly, the blow-by gases consists of partly oxidised mixed gas, a combustion gas and an incompletely combusted mixed gas. The blow-by gases contains about one quarter of the volume of hydrocarbons released from the engine. Furthermore, the blow-by gases are extremely acidic, causing corrosion within the engine and oil oxidation.
[0005] In a conventional state of art, as represented in figure 1, an engine block 100 of combustion engine is illustrated. The Fig. 1 depicts that after combustion, the blow-by gases travel at the bottom of the engine and move at the top by means of an entry vent 102 from which blow by gases enter the positive crankcase ventilation (PCV) 101. The function of the PCV 101 is to separate the oil mist from blow by gases. It is covered by a single plate. The PCV 101 comprises of multiple chambers as shown in figure 2. The PCV 101 has restrictors or walls to create multiple chambers through which the blow by gases travel. The PCV 101 further comprises of an exit vent 103 of the PCV 101 through where the gases travel by to move out of the chamber and an oil drainage hole 104 through which the separated oil travels down from the oil drainage hole to an oil drainage area 105 due to gravity.
[0006] The disadvantages of the above state of art is that, in conditions when the engine is in an inclined state the oil though moves toward the drainage hole due to gravity but is not completely removed from the PCV. In certain conditions, such as an inclined state the chamber in the engine block start acting as oil collector instead and proper drainage of oil is not achieved.
[0007] In the recent years, as more and more features are being introduced to remove any oil, moisture, and blow-by gases that are ventilated through the crankcase ventilation arrangement but none of the prior art describe an efficient way of removing the entire oil from the chamber.
[0008] Further in some known techniques present in the relevant industry, an oil separation device is used which are capable of suppressing the oil adhering to the separation wall from remaining and leading to the generation of sludge. The oil separation device uses cover which is assembled to a side wall of a cylinder block in an internal combustion engine and forms an introduction space for introducing blow-by gases between the side wall and the cover. And a separator that separates the oil from the gas by taking in the blow-by gases introduced into the introduction space and applying the flow of the gas to the separation wall to attach oil in the gas to the separation wall. The gist of the oil separator is that the cover is formed with a support portion for supporting an accessory part of the internal combustion engine. The disadvantage of the above prior art is that with the current device, the oil separation is not efficient. It increases oil consumption rate and deteriorate vehicle emissions.44.
[0009] Further, a PCV system V-type engine were used to overcome the disadvantages of known techniques. Wherein, deaerator is constructed to the feasible gas-liquid separation and prevents the oil in the deaerator from entering into intake manifold. This prior art contains multiple chamber and therefore is understood as not an efficient way of removing the oil from the chamber.
[0010] It is thereby required to provide a single cavity in the engine block that is inclined to capably drain the entire oil down through the oil drainage hole(s).

OBJECTS OF THE DISCLOSURE
[0011] It is therefore the object of the present disclosure to overcome the aforementioned and other drawbacks in prior method/product/apparatus.
[0012] It is a primary object of the present disclosure to provide a single cavity in the engine block.
[0013] It is another object of the present disclosure to provide an upper and lower plate to cover the cavity.
[0014] It is a preferred object to provide one or more chambers in the lower plate.
[0015] It is a preferred object of the present disclosure to provide plurality of oil drainage holes.
[0016] It is a preferred object of the present disclosure to provide structures to impact the flow of blow-by gases to effectively separate out the oil mist from the blow-by gases.
[0017] It is another object of the present disclosure to provide baffles on the upper plate to effectively drain oil from the blow by gases.
[0018] These and other objects and advantages of the present subject matter will be apparent to a person skilled in the art after consideration of the following detailed description taken into consideration with accompanying drawings in which preferred embodiments of the present subject matter are illustrated.

SUMMARY
[0019] Solution to one or more drawbacks of existing technology and additional advantages are provided through the present disclosure. Additional features and advantages are realized through the technicalities of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered to be a part of the claimed disclosure.
[0020] The present disclosure offers a solution in the form of a crankcase ventilation system for an inclined internal combustion engine including a plurality of cover plates coupled together forming a one or more chamber allowing the separation of oil from blow-by gases, where the plurality of cover plates includes a lower plate and an upper plate that is welded to the lower plate, and the lower plate welded with the upper plate forms a plurality of chambers where oil and gas are separated.
[0021] In an aspect of the invention, crankcase ventilation system includes an engine cavity having an entry for blow by gases and a drainage hole that is provided at the lowest most point of the engine cavity, the engine cavity has no chambers. Further, oil from the engine cavity drains through the drainage hole..
[0022] In an aspect of the invention the lower cover plate includes, an entry vent for flow of blow-by gases; a first chamber receiving the blow-gases from the entry vent, with a first guiding rib arranged and configured for guiding oil droplets into a first oil drain located in the first chamber.
[0023] In an another aspect of the invention the lower cover plate includes a second chamber receiving the blow-gases from the first chamber, with a wall structure, wherein the structure configured for impacting flow of blow-by gases towards wall structure; a second guiding rib arranged behind the wall structure; and a third guiding rib arranged in a horizontal direction below the wall structure configured for guiding oil droplets into a second oil drain located in the second chamber. Further, the entry vent is in line with the entry provided in the engine cavity for blow by gases
[0024] In an aspect of the invention the upper cover plate includes a baffle structure arranged corresponding to the first chamber of the lower cover plate; a cut-out portion arranged corresponding to the second chamber of the lower cover plate to accommodate the wall structure.
[0025] In an another aspect of the invention the upper cover plate includes an inclined wall arranged corresponding to the second chamber of the lower cover plate configured for directing flow of impacting blow-by gases; an exit vent for flow of blow-by gases. Further, the exit vent is in line with the drainage hole.
[0026] The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.

BRIEF DESCRIPTION OF THE DRAWINGS
[0027] It is to be noted, however, that the appended drawings illustrate only typical embodiments of the present subject matter and are therefore not to be considered for limiting of its scope, for the present disclosure may admit to other equally effective embodiments. The detailed description is described with reference to the accompanying figures. In the figures, a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the figures to reference like features and components. Some embodiments of system or methods or structure in accordance with embodiments of the present subject matter are now described, by way of example, and with reference to the accompanying figures, in which:
[0028] Fig. 1 illustrates conventional art internal combustion engine and single plate placed on the chambers present in the engine;
[0029] Fig. 2 illustrates chambers for passage of blow-by gases and oil separation arrangement of the conventional art;
[0030] Fig.3a illustrates the single cavity presence in the internal combustion engine block according to the present invention;
[0031] Fig. 3b is a perspective view of placing a lower plate on the internal combustion engine block according to the present invention;
[0032] Fig. 3c is a perspective view of placing an upper plate on the lower plate according to the present invention;
[0033] Fig. 4 is an illustration of the lower plate forming a one or more chamber allowing the separation of oil from blow-by gases;
[0034] Fig. 5 is an illustration of the upper plate allowing the separation of oil from blow-by gases.
[0035] The figures depict embodiments of the present subject matter for illustration only. A person skilled in the art will easily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.

DETAILED DESCRIPTION
[0036] While the embodiments of the disclosure are subject to various modifications and alternative forms, a specific embodiment thereof has been shown by way of example in the figures and will be described below. It should be understood, however, that it is not intended to limit the disclosure to the particular forms disclosed, but on the contrary, the disclosure is to cover all modifications, equivalents, and alternatives falling within the scope of the disclosure.
[0037] The terms “comprises”, “comprising”, or any other variations thereof used in the disclosure, are intended to cover a non-exclusive inclusion, such that a device, system, assembly that comprises a list of components does not include only those components but may include other components not expressly listed or inherent to such system, or assembly, or device. In other words, one or more elements in a system or device proceeded by “comprises… a” does not, without more constraints, preclude the existence of other elements or additional elements in the system or device.
[0038] Referring to Fig.3a of the present invention, the internal combustion engine block 100 is presented. A single cavity 106 is illustrated to receive the blow-by gases via an entry vent 102. The present invention presents an objective to receive the blow-by gases in a crankcase ventilation system comprising of a plurality of cover plates coupled together. The plurality of cover plates is placed on the top of the single cavity 106. Referring to Fig.3b, a lower plate 107 is placed on the top of the single cavity 106 with the entry vent 102 to receive the blow-by gases. As illustrated in Fig.3c an upper plate 108 is placed on top of the lower plate 107 to form closed space allowing flow of blow-by gases and the separation of oil from blow-by gases within said crankcase ventilation system formed by coupling of the upper and lower plate. The blow-by gases are then allowed to escape to intake manifold via an exit vent 103.
[0039] In an embodiment, the upper plate 108 is welded to the lower plate 107, and the assembly of the upper plate 108 and the lower plate 107 forms a plurality of chambers where oil and gas are seperated.
[0040] In the aspect of the present invention, referring to Fig. 4, the lower plate 107 has been configured to process the flow of blow-by gases. The objective of the crankcase ventilation system and the lower plate is to provide a configuration for allowing separation of oil from blow-by gases and further collect the separated oil. For such preferred part of the invention, the lower plate includes, the entry vent 102 which allows the entrance of the blow-by gases coming from the engine block.Tthe entry vent (102) is in line with the entry (102) provided in the engine cavity (106) for blow by gases The lower plate 107 is segmented into two chambers. In the first chamber 110, wherein the entry vent 102 is located receives the blow-by gases. The blow-by gases flow 109 in the first chamber 110. The oil droplets present in the blow-by gases are separated and the flow of oil 112 is guided towards the first oil drain 113 located in the first chamber 110 with the assistance from the first guiding rib 111.
[0041] In a preferred aspect, the first chamber 110 has two first guiding rib 111 placed in a slant direction to guide the flow of oil 112 into the first oil drain 113. The first guiding ribs are to be understood as long raised piece on the surface of lower plate 107. Their purpose is to restrict the oil flow into unwanted spaces and direct the oil towards the oil drain.
[0042] In the aspect of the invention, the lower plate has a second chamber 115 in continuance with the first chamber 110. The second chamber receives 115 the flowing 109 blow-by gases from the first chamber. The flowing 109 blow-by gases impact wall structure 116. The wall structure 116 is placed vertically in the second chamber 115 such that the toothed face receives the impact of flowing blow-by gases. The impaction of blow-by gases on the wall changes the momentum of blow-by and in this process relatively heavy oil mist particles are separated out from the blow-by gases. The blow-by gases has the tendency to escape from the sideways of the wall structure 116 but the oil gets separated and is received on the floor of the lower plate. Now, the separated oil is guided so that the oil flow 112 is towards the second oil drain 114 located at the lowest point in the second chamber. This is achieved by placing a second guiding rib 117 behind the wall 116 and a third guiding rib 118 below the wall 116.
[0043] In a preferred aspect of the invention, there are two second guiding rib 117 arranged in a slant direction behind the wall structure 116 to guide the separated oil from the blow-by gases.
[0044] In a preferred aspect of the invention, there is only one third guiding rib 118 placed below the wall direction so as to direct the oil flow 112 towards the second oil drain 114.
[0045] Now it is to be understood, that the upper plate 108 is placed on the top of the lower plate 107. This coupling together of upper and lower plate forms the crankcase ventilation system with one or more chambers allowing the separation of oil from blow-by gases.
[0046] In the present invention, referring to Fig. 5, the upper plate 108 includes, a baffle structure 119. The baffle structure 119 is to be understood as a flow conveyance structure configured in form of multiple zig-zag structures acting as constraint feature for impacting the flow of blow-by gases. The flowing blow-by gases 109 impact the zig-zag construction of the baffle structure 119 and causes the oil separation so that the oil flow 112 is achieved. When the upper plate 108 is placed on top of the lower plate 107 the baffle structure 119 is arranged corresponding to the first chamber 110 and between the two first guiding rib 111. The arrangement results into such configuration that, the impacting blow-by gases on the baffle structure 119 causes oil separation which is received in the first chamber 110 of lower plate 107 and is the oil flow 112 is guided by the first guiding rib 111 into the first oil drain 113.
[0047] In the invention, referring to Fig. 5, a cut-out portion 120 is arranged in the upper plate 108. When the upper plate is placed on top of the lower plate 107 the cut-out portion is in corresponding arrangement to the second chamber 115 of the lower plate 107 and receives the wall structure 116.
[0048] Further in, the upper plate 108, includes an inclined wall 121 arranged corresponding to the second chamber 115 of the lower cover plate 107 configured for directing flow 109 of impacting blow-by gases. In a preferred arrangement in the invention, the inclined wall is placed between the two second guiding rib structure. Thus, the flowing 109 blow-by gases post impacting the wall structure 116 impact the inclined wall 121 standing between the two second guiding rib 117 in the second chamber 115 of lower plate 107. The impact of blow-by gases on the inclined wall 121 causes oil separation which is collected on the floor of the second chamber 115 only to be guided by the second rib towards the second oil drain 114.
[0049] An exit vent 103 is arranged at the terminal end of the upper plate 108 so that the blow-by gases can escape towards the intake manifold. It is to be understood that the flow 109 of blow-by gases is dependent on the pressure difference created in the crankcase ventilation system according to the invention and the intake manifold. The exit vent 103 is in line with the drainage hole 104
[0050] The crankcase ventilation system with a plurality of cover plates and preferably the lower plate and upper plate coupled together forming one or more chambers are advantageous for the separation of oil from blow-by gases effectively and with the configuration of guiding rib allows the oil to be drained towards the oil drain. With the disclosed crankcase ventilation system, the oil does no longer accumulates on the surface or within the chambers and is effectively drained out of the ventilation system for further processing as intended.
[0051] It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as “open” terms (e.g., the term “including” should be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation, no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases “at least one” and “one or more” to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles “a” or “an” limits any particular claim containing such introduced claim recitation to disclosures containing only one such recitation, even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an” (e.g., “a” and/or “an” should typically be interpreted to mean “at least one” or “one or more”); the same holds true for the use of definite articles used to introduce claim recitations. Also, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of “two recitations,” without other modifiers, typically means at least two recitations or two or more recitations). Furthermore, in those instances where a convention analogous to “at least one of A, B, and C, etc.” is used, in general, such construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances, where a convention analogous to “at least one of A, B, or C, etc.” is used, in general, such construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B.”
[0052] It will be further appreciated that functions or structures of a plurality of components or steps may be combined into a single component or step, or the functions or structures of one-step or component may be split among plural steps or components. The present disclosure contemplates all of these combinations. Unless stated otherwise, dimensions and geometries of the various structures depicted herein are not intended to be restrictive of the disclosure, and other dimensions or geometries are possible. Also, while a feature of the present disclosure may have been described in the context of only one of the illustrated embodiments, such feature may be combined with one or more other features of other embodiments, for any given application. It will also be appreciated from the above that the fabrication of the unique structures herein and the operation thereof also constitute methods in accordance with the present disclosure. The present disclosure also encompasses intermediate and end products resulting from the practice of the methods herein. The use of “comprising” or “including” also contemplates embodiments that “consist essentially of” or “consist of” the recited feature.