Description:TECHNICAL FIELD
[0001] The present disclosure in general relates to a breather mounted over the transmission housing. More specifically, the present disclosure relates to a breather structure that cooperate to block water from entering inside the transmission housing.

BACKGROUND OF THE INVENTION
[0002] Background description includes information that may be useful in understanding the present invention. It is an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.
[0003] Breather assembly in general is mounted on transmission to maintain the pressure equilibrium inside transmission. Breather allows the transmission to breathe air when the air inside transmission expands or contracts due to heating and cooling of lubricating oil during vehicle running. Breather allows the hot air to escape and cool air to enter into the transmission to prevent overheating issue.
[0004] Specifically, breathers are used to release air pressure, which builds up during operation, from within a housing for driveline components such as axles and transmissions.
[0005] One of the problem arises with the existing design of the breather is that, there is an opening provided on the top side of the breather pipe for venting of the air. Through the opening sometimes water might get enter during field operation, rainy seasons or during washing of the tractor.
[0006] Basically, water inside the transmission unit is highly destructive as it mixed with the transmission fluid. In addition, the transmission unit is made up of sensitive parts that quickly deteriorate when exposed to water due to rusting phenomena that may lead to damage of various components. It also result in the corrosion of the friction plates placed inside the transmission unit that will no longer allow the shifting of gears.
[0007] In addition, the other problem with current breathers is that the breathers provide a leakage path for lubricating fluid present inside the housing. In general, this leakage of lubricating fluid is caused by several different operational modes, such as pumping, splashing, and spattering created by internal driveline components enclosed within the housing. Moreover, the air flow rate, fluid temperature, changes in operational speed, etc. can also affect leakage amounts.
[0008] Several different solutions have been proposed to address this problem but have had limited success. One solution provides a breather body that is threaded into the housing with one end extending outwardly from the housing and an opposite end being flush with an internal wall of the housing. The breather body has an internal bore that includes a pair of baffles offset from each other to block lubricating fluid from exiting the bore. During operation a thick film of fluid bridges an opening to the internal bore at the internal wall of the housing.
[0009] This thick film of fluid causes fluid to collect at the breather location, which is undesirable. The baffles prevent some but not all of the lubricating fluid from exiting the breather. Mesh screens have also been used in place of baffles to prevent fluid from exiting the breather. These mesh screens have a tendency to clog and do not allow fluid to drain back into the housing.
[0010] Another solution provides a breather body with a tube that extends into the housing cavity. The tube has the same problems identified above. A thick film of fluid bridges an opening at an internal end of the tube, which results in fluid being drawn to the breather. Further, the tube does not prevent fluid that is splashed or splattered in a direction toward the tube from exiting the breather.
[0011] Thus, there is a need for a breather that can prevent lubricating fluid from exiting the breather under harsh operating conditions while still allowing air to vent as needed. In addition, there is also a need for the breather having configuration that prevents the entering of the water inside the transmission housing through breather. Moreover, the proposed layout of breather helps in increasing an overall efficiency of the vehicles as well as providing the better performance & reliability.
OBJECTS OF THE INVENTION
[0012] A general or primary object of the present disclosure is to provide a breather having technical configuration that prevents the allowance of water inside the transmission housing via breather.
[0013] It is another object of the present disclosure is to provide the breather having technical configuration that prevents the leakage of lubricating oil from the transmission housing.
[0014] It is another object of the present disclosure is to provide the breather having better durability.
[0015] It is yet another object of the present disclosure is to provide the breather for vehicle which is simple in construction and cost effective.
[0016] It is yet further object of the present disclosure is to provide the breather assembly which can be produced economically on a mass production basis.
[0017] These and other objects of the present invention will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings.

SUMMARY
[0018] In accordance with an embodiment, the present disclosure provides a breather for transmission unit in a vehicle, the breather comprising a pipe of coil-shaped structure having a top bend and a bottom bend, wherein the top bend connected to the bottom bend via a vertical arm; an extension arm, wherein the bottom bend of the pipe connected to a transmission housing via the extension arm; characterized in that, the extension arm and the vertical arm connected to one another perpendicularly at the bottom bend, wherein the other end of the extension arm connected to the transmission housing via a banjo fitting.
[0019] In accordance with an aspect, the pipe comprises a first end vented to the atmosphere.
[0020] In accordance with an aspect, the first end placed above the bottom bend of the pipe.
[0021] In accordance with an aspect, coil-shaped inner diameter from pipe centre is ranges in between 45 mm to 46 mm.
[0022] In accordance with an aspect, the outer diameter (OD) of the pipe ranges in between 8 mm to 8.5 mm.
[0023] In accordance with an aspect, the inner diameter (ID) of the pipe ranges in between 6 mm to 6.5 mm with a thickness (t) of 0.91 mm.
[0024] In accordance with an aspect, the radius (r) of the bottom bend (106) ranges in between 12 mm to 13 mm.
[0025] In accordance with an aspect, the banjo fitting affixed inside the cavity formed at the top of the transmission housing In accordance with an aspect, the banjo fixture connected with the second end of the pipe through brazing.
[0026] In accordance with an aspect, the banjo fixture is fitted over the transmission unit via banjo bolt inserted inside the hole formed on the banjo fixture.
[0027] 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 THE DRAWINGS
[0028] The accompanying drawings are included to provide a further understanding of the present disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.
[0029] FIG.1A illustrates a breather mounted over the transmission housing in a vehicle in accordance with the present disclosure.
[0030] FIG.1B illustrates an enlarged view of the breather in accordance with the present disclosure.
[0031] FIG.2 also illustrates an enlarged view of the breather in accordance with the present disclosure.
[0032] FIG.3 illustrates a cross-sectional view of the breather mounted over the transmission housing in a vehicle in accordance with the present disclosure.
[0033] FIG.4A illustrates the dimensions of the breather in accordance with the present disclosure.

DETAILED DESCRIPTION
[0034] The following is a detailed description of embodiments of the disclosure depicted in the accompanying drawings. The embodiments are in such details as to clearly communicate the disclosure. However, the amount of detail offered is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims.
[0035] If the specification states a component or feature “may”, “can”, “could”, or “might” be included or have a characteristic, that particular component or feature is not required to be included or have the characteristic.
[0036] Exemplary embodiments will now be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments are shown. This disclosure may however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete and will fully convey the scope of the disclosure to those of ordinary skill in the art. Moreover, all statements herein reciting embodiments of the disclosure, as well as specific examples thereof, are intended to encompass both structural and functional equivalents thereof. Additionally, it is intended that such equivalents include both currently known equivalents as well as equivalents developed in the future (i.e., any elements developed that perform the same function, regardless of structure).
[0037] Various terms as used herein. To the extent a term used in a claim is not defined below, it should be given the broadest definition persons in the pertinent art have given that term as reflected in printed publications and issued patents at the time of filing.
[0038] As used in the description herein and throughout the claims that follow, the meaning of “a,” “an,” and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.
[0039] The recitation of ranges of values herein is merely intended to serve as a shorthand method of referring individually to each separate value falling within the range. Unless otherwise indicated herein, each individual value is incorporated into the specification as if it were individually recited herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g. “such as”) provided with respect to certain embodiments herein is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention otherwise claimed. No language in the specification should be construed as indicating any non-claimed element essential to the practice of the invention.
[0040] Groupings of alternative elements or embodiments of the invention disclosed herein are not to be construed as limitations. Each group member can be referred to and claimed individually or in any combination with other members of the group or other elements found herein. One or more members of a group can be included in, or deleted from, a group for reasons of convenience and/or patentability. When any such inclusion or deletion occurs, the specification is herein deemed to contain the group as modified thus fulfilling the written description of all groups used in the appended claims.
[0041] Aspects of the present disclosure relates to an efficient and economical breather assembly for driveline components such as axles, transfer cases, transmissions, etc., which prevents entrance of water, lubrication leakage even under severe operating conditions while still allowing air to be vented as needed.
[0042] FIG.1A illustrates a breather mounted over the transmission housing in a vehicle in accordance with the present disclosure.
[0043] A breather 200 is mounted in a cavity 102 provided at the top 104 of the transmission unit 100. The breather 200 is fixed in the cavity 102 via a banjo fitting 212. A banjo bolt 106 is fixed in the hole 212-H provided in the banjo fitting 212 via a set of washers provided on both the sides of the banjo fitting. FIG.1B illustrates an enlarged view of the breather 200 in accordance with the present disclosure.
[0044] However, FIG.2 illustrates the various components of the breather 200. The breather 200 comprisesa pipe 202 of coil-shaped structure having a top bend 204 and a bottom bend 206, wherein the top bend 204 connected to the bottom bend 206 via a vertical arm 208. It further comprises an extension arm 210, wherein the bottom bend 206 of the pipe 202 connected to a transmission unit 100 via the extension arm 210. The extension arm 210 and the vertical arm 208 connected to one another perpendicularly at the bottom bend 206, wherein the other end of the extension arm 210 or second end 202-S of the pipe 202 connected to the transmission unit 100 via a banjo fitting 212.
[0045] The pipe also comprises a first end 202-F that is an open–end vented to the atmosphere. This first end 202-F is placed above the bottom bend 206 of the pipe 202.
[0046] FIG.3 illustrates a cross-sectional view of the breather mounted over the transmission housing in a vehicle in accordance with the present disclosure.
[0047] FIG.4A illustrates the crossection of the breather along A-A in accordance with the present disclosure. As mentioned earlier, the vertical arm 208 and the extension arm 210 are placed at an angle of 900. The distance between the centre of the banjo fitting 212 and the centre of the bottom bend 206 is 64.5mm. In addition, the distance between the centre of the banjo fitting 212, and the lower section of the bottom bend 206 is 52mm.
[0048] Moreover, the height of the vertical arm of the bottom bend 206 is 29mm from the centre of the banjo fitting 212. The radius of the bottom bend ranges in between 12 mm to 13mm.
[0049] FIG.4B illustrates the crossection of the breather in accordance with the present disclosure. As mentioned earlier, the pipe 202 of the breather 200 is of coil shaped structure, wherein the inner diameter of coil-shaped structure from centre to centre of pipeis 45mm.The outer diameter (OD) of the pipe (202) ranges in between 8 mm to 8.5 mm. The inner diameter (ID) of the pipe (202) ranges in between 6 mm to 6.5 mm with a thickness (t) of 0.91 mm.
[0050] In addition, the distance from the bottom of the coil to the top of the coil is 25.5mm. Moreover, the distance between the centre of the bottom of the coil to the centre of the coil above the bottom is 8.5mm. Furthermore, the distance between the centre of the bottom of the coil to the centre of the coil below the top coil is 17mm.
[0051] FIG.4C also illustrates the crossection of the breather in accordance with the present disclosure. The banjo fitting 212 comprises a circular hole 212-H and a hollow cylinder 212-C attached at a base of the circular hole 212-H for incorporating the pipe. Here, the circular hole 212-H is of external diameter of 12 mm and the thickness is or 1.8 mm. And the hollow cylinder 212-C comprises an internal diameter of 8.15mm and the external diameter of 10.5mm. The circular hole 212-H and the hollow cylinder 212-C is combined with one another through a bend having a radius of 2.5 mm. In addition, the distance from the centre of the circular hole 212-H and the end of the hollow cylinder 212-C is 18mm.
WORKING MECHANISM
[0052] Here, as mentioned, the breather 200 is of coil shaped structure in which the first end 202-F is placed above the bottom bend 206 of the pipe 200. This first end 202-F is open and vented to the atmosphere. In general, this opening serves the purpose of intake of water during field operation, rainy seasons or during washing of the tractor. If the water enters through the first end 202-F of the pipe, the water reaches only up to the turn of the coil that is just above the first end 202-F of the pipe. Specifically, due to the configuration of the breather, this water does not enter inside the transmission unit 100 due to gravity. In this manner, due to the proposed structure of the breather 200, the corrosion of the various components present inside the housing does not occur. In addition, the breather also prevents the leakage of lubricating oil from the transmission housing.
[0053] It should be apparent to those skilled in the art that many more modifications besides those already described are possible without departing from the inventive concepts herein. The inventive subject matter, therefore, is not to be restricted except in the spirit of the appended claims. Moreover, in interpreting both the specification and the claims, all terms should be interpreted in the broadest possible manner consistent with the context. In particular, the terms “comprises” and “comprising” should be interpreted as referring to elements, components, or steps in a non-exclusive manner, indicating that the referenced elements, components, or steps may be present, or utilized, or combined with other elements, components, or steps that are not expressly referenced. Where the specification claims refers to at least one of something selected from the group consisting of A, B, C ….and N, the text should be interpreted as requiring only one element from the group, not A plus N, or B plus N, etc.
[0054] 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 appended claims.
[0055] While the foregoing describes various embodiments of the invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof. The scope of the invention is determined by the claims that follow. The invention is not limited to the described embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.

ADVANTAGES OF THE INVENTION

[0056] The present disclosure provides a breather having technical configuration that prevents the allowance of water inside the transmission housing via breather.
[0057] In addition, the present disclosure provides the breather that prevents the leakage of lubricating oil from the transmission housing.
[0058] Moreover, the present disclosure provides the breather having better durability.
[0059] The present disclosure provides the breather for vehicle which is simple in construction and cost effective.
[0060] The present disclosure provides the breather which can be produced economically on a mass production basis.
, Claims:We claim

1. A breather (200) for transmission unit (100) of a vehicle, the breather (200) comprising
a pipe (202) of coil-shaped structure having a top bend (204) and a bottom bend (206), wherein the top bend (204) connected to the bottom bend (206) via a vertical arm (208);
an extension arm (210), wherein the bottom bend (206) of the pipe (202) connected to a transmission unit (100) via the extension arm (210);
characterized in that, the extension arm (210) and the vertical arm (208) connected to one another perpendicularly at the bottom bend (206), wherein the other end of the extension arm (210) or second end (202-S) of the pipe (202) connected to the transmission unit (100) via a banjo fixture (212).
2. The breather (200) as claimed in claim 1, wherein the pipe (202) includes a first end (202-F) vented to the atmosphere.
3. The breather (200) as claimed in claim 2, wherein the first end (202-F) placed above the bottom bend (206) of the pipe.
4. The breather (200) as claimed in claim 1, wherein diameter of the coil-shaped design from pipe centre to centre (102) ranges in between 45 mm to 46 mm.
5. The breather (200) as claimed in claim 1, wherein the outer diameter (OD) of the pipe (202) ranges in between 8 mm to 8.5 mm.
6. The breather (200) as claimed in claim 1, wherein the inner diameter (ID) of the pipe (202) ranges in between 6 mm to 6.5 mm with a thickness (t) of 0.91 mm.
7. The breather (200) as claimed in claim 1, wherein the radius (r) of the bottom bend (206) ranges in between 12 mm to 13 mm.
8. The breather (200) as claimed in claim 1, wherein the banjo fixture (212) affixed inside the cavity (102) formed at the top (104) of the transmission unit (100).
9. The breather (200) as claimed in claim1, wherein the banjo fixture (212) connected with the second end (202-S) of the pipe (202) through brazing.
10. The breather (200) as claimed in claim 9, wherein the banjo fixture (212) is fitted over the transmission unit via banjo bolt (106) inserted inside the hole (212-H) formed on the banjo fixture (212).