Description:A CASING FOR COVERING A VENT HOLE OF AN EGR UNIT OF AN AUTOMOBILE

TECHNICAL FIELD
[0001] The present subject matter in general relates to an exhaust gas circulation (EGR) unit that is mounted on a vehicle and circulates exhaust gas (fluid) to an intake passage. In particular, the present subject matter provides a casing for covering a vent hole that in turn restricts the entry of foreign particles in the EGR unit.

BACKGROUND
[0002] Automotive industry in India is one of the main pillars of the economy. With strong backward and forward linkages, it is a key driver of growth. In addition, automotive industry has always been known to be very competitive as far as its design and material usage are concerned. Therefore, the automotive industry is always facing greater market pressure to develop high quality products more quickly with different variants of a particular vehicle model in order to cater different segments of end users.
[0003] An exhaust gas recirculation unit, or EGR unit in short, is one of the main components of the vehicle’s engine management system. It recirculates finely metered quantities of exhaust gas to the engine intake system for increased engine efficiency, reduced fuel consumption and lower NOx emissions.
[0004] With growing pressures to reduce emissions, the EGR unit will play an increasingly important role in moving forward.
[0005] Nowadays, nearly 80 percent of the air we breathe is nitrogen. However, when it is exposed to the extremely high temperatures in the combustion chamber, plus 1370°C, the normally inert gas becomes reactive, creating harmful oxides of nitrogen or NOx, which are then passed through the exhaust system into the atmosphere.
[0006] In order to minimize this, the EGR unit allows a precise quantity of exhaust gas to re-enter the intake of the system, effectively changing the chemical makeup of the air entering the engine. With less oxygen, the now diluted mixture burns slower, lowering temperatures in the combustion chamber by almost 150°C, and reducing NOx production for a cleaner, more efficient exhaust.
[0007] EGR units in general operate in a hostile environment as there is great chance of entry of foreign particles through a vent hole provided on the EGR unit. This may result in clogging of tubes, exhaust gas channels and eventually the unit’s plunger mechanism, causing it to either stick open or close. This may result in the non-working of the EGR units.
[0008] Due to the non-working of EGR units, lots of problems arises such as
• Engine Performance- If the unit is stuck open, then the vehicle’s air-fuel ratio will be disrupted causing engine performance issues such as reduced power, poor acceleration and rough idle. It may also produce turbo boost pressure leaks, causing the turbo to work harder.
• NOx Emissions- When the EGR unit remains shut, the resultant high temperatures in the combustion chamber will leave a lot of unburned fuel in the exhaust, leading to increased NOx emissions and reduced fuel efficiency.
• Engine knock- the higher temperatures and NOx may also result in increased detonation or knock, heard as knocking noises in the engine.
[0009] In order to overcome these problems, there is a need of a casing that helps in covering a vent hole provided on the EGR unit.

OBJECTS OF THE INVENTION
[0010] The primary objective of the present subject matter is to provide a casing that helps in covering a vent hole provided on the EGR unit.
[0011] It is another objective of the present subject matter is to provide the casing that fits over EGR unit in different variants of a particular vehicle model in order to cater different segments of end users.
[0012] It is yet another objective of the present subject matter is to provide the casing that can be attached or detached with the EGR unit as per the requirements.

SUMMARY
[0013] This summary is provided to introduce concepts relating to a structure of a casing that is used for covering the vent hole in an EGR unit that restricts the entry of foreign particle in the EGR unit in an automobile. The concepts are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.
[0014] The present disclosure defines a casing for covering a vent hole of an EGR unit of an automobile, the casing comprising a flat rectangular surface; an upper flange extends perpendicularly away from an upper horizontal side of the flat surface and a lower flange extend perpendicularly away from a lower horizontal side of the flat surface, wherein a slot is provided in center of each of the flanges; and a left side flange extend perpendicularly away from a vertical left side and a right side flange extend perpendicularly away from vertical right side of the flat surface , wherein the upper and lower flanges extend in same direction as of the left side and right side flanges .
[0015] In an aspect, a semi–circular cut out profile is defined at a lower portion of the left side flange.
[0016] In an aspect, a mounting hole is provided at a lower portion of the right side flange facing the semi–circular cut out profile.
[0017] In an aspect, the slots provided on the flanges on the upper horizontal side and a lower horizontal side are configured to fit the casing along a rib of the EGR unit to avoid anti-rotation during assembly.
[0018] In an aspect, an opening is provided in between the flange provided on the upper side and the flanges provided on the vertical left side and the vertical right side.
[0019] In an aspect, an opening is provided in between the flange provided on the lower side and the flanges provided on the vertical left side and the vertical right side.
[0020] In an aspect, the semi–circular cut out profile is configured to adapt with a profile of EGR housing mounting profile.
[0021] In an aspect, the mounting hole is provided to join/align with the existing EGR housing mounting hole for assembly.
[0022] To further understand the characteristics and technical contents of the present subject matter, a description relating thereto will be made with reference to the accompanying drawings. However, the drawings are illustrative only but not used to limit the scope of the present subject matter.
[0023] Various objects, features, aspects, and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.

BRIEF DESCRIPTION OF FIGURES
[0024] The illustrated embodiments of the present disclosure will be best understood by reference to the drawings, wherein like parts are designated by like numerals throughout. The following description is intended only by way of example, and simply illustrates certain selected embodiments of devices, systems, and processes that are consistent with the subject matter as claimed herein, wherein:
[0025] FIG.1 illustrates an EGR unit in accordance with prior art.
[0026] FIG.2A illustrates the EGR unit covered by a casing in accordance with a present subject matter.
[0027] FIG.2B illustrates the assembly between the EGR unit and the casing in accordance with the present subject matter.
[0028] FIG.3A illustrates the front view of the casing in accordance with the present subject matter.
[0029] FIG.3B illustrates the top view of the casing in accordance with the present subject matter.
[0030] FIG.4 illustrates the dimension of the casing in accordance with the present subject matter.
[0031] The figures depict embodiments of the present subject matter for the purposes of 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
[0032] A few aspects of the present disclosure are explained in detail below with reference to the various figures. Example implementations are described to illustrate the disclosed subject matter, not to limit its scope, which is defined by the claims. Those of ordinary skill in the art will recognize a number of equivalent variations of the various features provided in the description that follows.
EXEMPLARY IMPLEMENTATIONS
[0033] While the present disclosure may be embodied in various forms, there are shown in the drawings, and will hereinafter be described, some exemplary and non-limiting embodiments, with the understanding that the present disclosure is to be considered an exemplification of the invention and is not intended to limit the invention to the specific embodiments illustrated. Not all of the depicted components described in this disclosure may be required, however, and some implementations may include additional, different, or fewer components from those expressly described in this disclosure. Variations in the arrangement and type of the components may be made without departing from the scope of the claims as set forth herein.
[0034] The general purpose of the EGR unit as depicted in FIG.1 is to recirculates finely metered quantities of exhaust gas to the engine intake system for increased engine efficiency, reduced fuel consumption and lower NOx emissions. It further comprises a motor unit 106 and the various connecting faces such as face mounted on EGR Cooler 108 having hole in the center from where the gas enter. It also comprises a face mounted on the cylinder head 110 having a hole in the center from where the gas comes out.
[0035] While working of the EGR unit, there is great chance of entrance of foreign particles through a vent 102 of the EGR unit 100. In order to solve this problem, the present disclosure provides a casing 300 for covering a vent hole 102 of an EGR unit 100 of an automobile as shown in FIG.2A. In addition, FIG.2B depicts the assembly 200 between the casing 300 and the EGR unit 100.
[0036] FIG.3A, and FIG.3B depicts the front and top view of the casing that clearly define the structure of the casing 300.
[0037] Here, the casing 300 comprises a flat rectangular surface 302 with an upper horizontal side 302-HU and lower horizontal side 302-LU. The dimension of upper horizontal side 302-HU and lower horizontal side 302-LU of the flat surface 302 is denoted by W in FIG.4. An upper flange 304 extend perpendicularly away from the upper horizontal side 302-HU of the rectangular flat surface 302 and a lower flange 306 extend perpendicularly away from the lower horizontal side 302-HL of the flat surface 302. The dimension of upper flange 304 and the lower flange 306 is denoted by X. Here, the dimension of the upper 302-HU and the lower horizontal side 302-HL of the rectangular face 302 are greater than the dimension of the upper 304 and lower flange 306 i.e. W>X.
[0038] The upper and lower flanges 304,306 further include slots 304-S, 306-S in center that helps in guiding the casing 300 along the rib 104 of the EGR unit 100. This is depicted in FIG.2B. The dimension of both the slot is defined by s. The dimension of slot s is less than the dimension of upper flange 304 and the lower flange 306 denoted by w i.e. sl.
[0043] However, a mounting hole 310-H is provided at a lower portion 310-L of the right-side flange 310. This mounting hole 310-H faces the semi–circular cut out profile 308-C formed on the lower portion 308-L of the left side flange 308. The dimension of the lower portion 310-L of the right side flange 310 is denoted by p. Here, the dimension L of right-side flange 310 is greater than the dimension p of its lower portion 310-L, i.e L.>p.
[0044] Moreover, an opening 312,314 is provided in between the upper flange 304 provided on the upper horizontal side 302-HU and the flanges 308,310 provided on the vertical left side 302-VL and the vertical right side 302-VR. Furthermore, an opening 316,318 is also provided in between the lower flange 306 provided on the lower horizontal side 302-HL and the flanges 308,310 provided on the vertical left side 302-VL and the vertical right side 302-HL. These openings 312,314,316,318 helps in venting off the released condensed vapor.
[0045] While fitting the casing 300 above the EGR unit 100, the semi–circular cut out profile 308-C is configured to adapt with a profile of EGR housing mounting profile 112 (shown in FIG.1). In addition, the mounting hole 310-H is provided to join/align with EGR housing existing mounting.
[0046] Through the above proposed assembly 200 between the casing 300 and the EGR unit 100, the problem existing with the prior arts related to this field of technology got solved up to great extent.
TECHNICAL ADVANTAGES
[0047] Due to the casing, a vent hole provided on the EGR unit is fully covered that in turn restricts the entry of foreign particles inside the EGR unit.
[0048] In addition, the casing fits over EGR unit in different variants of a particular vehicle model in order to cater different segments of end users.
[0049] Moreover, the casing can easily be attached or detached with the EGR unit as per the requirements.
[0050] Furthermore, the fitment of casing over the EGR unit improves the engine performance, reduces the NOx emissions, and the knocking in the engine.
[0051] The above description does not provide specific details of the manufacture or design of the various components. Those of skill in the art are familiar with such details, and unless departures from those techniques are set out, techniques, known, related art or later developed designs and materials should be employed. Those in the art are capable of choosing suitable manufacturing and design details.
[0052] Further, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. It will be appreciated that several of the above-disclosed and other features and functions, or alternatives thereof, may be combined into other systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations, or improvements therein may subsequently be made by those skilled in the art without departing from the scope of the present disclosure as encompassed by the following claims.
[0053] The claims, as originally presented and as they may be amended, encompass variations, alternatives, modifications, improvements, equivalents, and substantial equivalents of the embodiments and teachings disclosed herein, including those that are presently unforeseen or unappreciated, and that, for example, may arise from applicants/patentees and others.
[0054] It will be appreciated that variants of the above-disclosed and other features and functions, or alternatives thereof, may be combined into many other different systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations, or improvements therein may be subsequently made by those skilled in the art which are also intended to be encompassed by the following claims.
, Claims:We Claim:
1. A casing (300) for covering a vent hole (102) of an EGR unit (100) of an automobile, the casing (300) comprising
a flat rectangular surface (302);
an upper flange (304) extends perpendicularly away from an upper horizontal side (302-HU) of the rectangular flat surface (302) and a lower flange (306) extend perpendicularly away from a lower horizontal side (302-HL) of the flat surface (302), wherein a slot (304-S, 306-S) is provided in center of each of the flanges (304,306); and
a left side flange (308) extends perpendicularly away from a vertical left side (302-VL) and a right-side flange (310) extend perpendicularly away from vertical right side (302-VR) of the flat rectangular surface (302),
wherein the upper and lower flanges (304,306) extend in same direction as of the left side (308) and right side (310) flanges.
2. The casing (300) as claimed in claim 1, wherein a semi–circular cut out profile (308-C) is defined at a lower portion (308-L) of the left side flange (308).
3. The casing (300) as claimed in claim 2, wherein a mounting hole (310-H) is provided at a lower portion (310-L) of the right-side flange (310) facing the semi–circular cut out profile (308-C).
4. The casing (300) as claimed in claim 1, wherein the slots (304-S, 306-S) provided on the flanges (304,306) on the upper horizontal side (302-HU) and a lower horizontal side (302-HL) are configured to fit the casing (300) along a rib (104) of the EGR unit (100) to avoid anti-rotation during assembly.
5. The casing (300) as claimed in claim 1, wherein an opening (312,314) is provided in between the upper flange (304) provided on the upper horizontal side (302-HU) and the flanges (308,310) provided on the vertical left side (302-VL) and the vertical right side (302-VR).
6. The casing (300) as claimed in claim 1, wherein an opening (316,318) is provided in between the lower flange (306) provided on the lower horizontal side (302-HL) and the flanges (308,310) provided on the vertical left side (302-VL) and the vertical right side (302-VR).
7. The casing (300) as claimed in claim 1, wherein the semi–circular cut out profile (308-C) is configured to adapt with a mounting profile of EGR housing (112).
8. The casing (300) as claimed in claim 2, wherein the mounting hole (310-H) is provided to join with EGR valve mounting hole (114).