[0001] The present subject matter described herein relates to case structure of a transmission mounted on a vehicle. In particular, the present subject matter relates to structure of transmission casing to improve its strength and stiffness.
BACKGROUND
[0002] The transmission is used in an automotive vehicle that has an internal combustion engine to transmit power to a live axle. Transmission is equipped for a manual with traditional clutch and flywheel, automatic manual, automatic torque converter, automatic wet clutch, CVT and hybrids, north/south (rear wheel drive or front wheel drive), east/west (transverse and also with final drive unit) and transaxle configurations.
[0003] A transmission housing contains a transmission mechanism including a main transmission recording body, with a drive shaft and/or an output shaft of the transmission being specified in the longitudinal direction of the main housing or the entire transmission housing via a rotation axis. The transmission and/or a clutch of the transmission can be positioned at one axial end of the main body to connect a bell housing to the main housing to receive a torque converter
[0004] In the transmission case, in the axial direction of the transmission case, and between the support walls, the inlet shaft and the outlet shaft, and further along the ends of the torque transmission shaft, such as the counter shaft, a pair of support walls are supplied at reasonable intervals. A bending vibration in a direction perpendicular to the axis is produced when each of the torque transmission shafts is rotated. The bending vibration is fed through the support wall to the transmission case, and the transmission case is similarly driven by the shaft. The vibration of the transmission case at this time is especially produced between the support walls. These vibrations spread in the entire transmission casing.
[0005] The problem with the conventional state of art is that during the time when the reverse gear is applied, a maximum fatigue is observed during loading. The reverse/idler gear teeth are subjected to the most severe kind of fatigue loading at the time of fully reversing loads. This load gets transferred to the idler shaft nut and the transmission case surface cracking is observed. Another problem of the conventional state of art is that the orientation of a bolt coupling casing with transmission mechanism and the another bolt coupling different casings of transmission housing are not in-line or are not in a queue. Here in this case, the placement of idler shaft bolt which couples the transmission casing with transmission mechanism and the another bolt coupling the different casings of the transmission housing is offset. It then leads to the deformation due to less strength in this segment of the transmission casing.
[0006] The solution for the present problem is to maintain the orientation of the first bolt or known as an idler shaft bolt with respect to the second transverse bolts in a zero offset condition. i.e. the orientation should be in a single line.
[0007] In this several known techniques in the state of art have provided techniques related to improving the design of the transmission casing.
[0008] In the conventional designs, the invention relates to the case that has a housing unit for accommodating a coupling mechanism connected to a motor, where the coupling mechanism transmits drive force from the motor to a transmission mechanism. A set of outer protrusions is formed on an outer surface of a case body and a transition section to protrude outward in such a way that a triangle shape is formed below where the idler gear is mounted. Due to this, pressure on the idler gear and mating bolts is induced due to the triangular shape.
[0009] It is thereby required to maintain the orientation of the idler shaft bolt with respect to the second transverse bolts in a zero offset condition.
OBJECTS OF THE DISCLOSURE
[0010] It is therefore the object of the present disclosure to overcome the aforementioned and other drawbacks in prior method/product/apparatus.
[0011] It is a primary object of the present disclosure is to maintain the condition of the first bolt with respect to the second transverse bolts in a zero offset condition.
[0012] It is another object of the present disclosure to provide two flanges surrounding the first bolt to give support to the lower transmission casing.
[0013] It is another object of the present disclosure to provide a pair of flanges from one bolt portion to the other bolt portion to help in reducing deformation.
[0014] 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
[0015] 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.
[0016] The present disclosure offers a solution in the form a reinforcement structure disposed on a transmission casing housing a transmission mechanism, formed on an outer lateral surface on adjacent sides of a first bolt recess receiving a first bolt connecting to an idler shaft gear which includes a plurality of flanges arranged on each lateral side of the first bolt recess extending transversely and, connecting adjacent periphery of a protruded triangular structure (18b) formed on the outer periphery (18a) of the transmission casing (100); a second bolt recess arranged on the protruded triangular structure and disposed in line with the first bolt recess.
[0017] In an another aspect of the invention, a bulge structure disposed adjacent to the plurality of flanges.
[0018] In an another aspect of the invention, a cover is coupled on a first casing with a plurality of first transverse bolts and the first casing is coupled with a second casing with plurality of the second transverse bolts.
[0019] In yet another aspect of the invention, the outer periphery of the first casing accommodating the second transverse bolt fastening the second casing with the first casing arranged in the protruded triangular structure.
[0020] In yet another aspect of the invention, the second transverse bolt are inserted into the second bolt recess fastening the second casing with the first casing.
[0021] 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
[0022] 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:
[0023] Fig. 1 is an illustrative view of the transmission casing;
[0024] Fig. 2 is a perspective inner view of the transmission mechanism inside the transmission casing;
[0025] Fig. 3 is a perspective view for depicting the reinforcement structure of the present invention.
[0026] 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
[0027] 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.
[0028] 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.
[0029] Referring to Fig.1 and 2 of the present invention, the transmission casing (100) is depicted. The transmission casing (100) houses arrangement of a transmission including a main housing accommodating a plurality of meshing gears for driving the powertrain of the vehicle. The meshing gears constitutes the transmission mechanism (101). The transmission mechanism (101) function is transferring engine power to the driveshaft and rear wheels (or axle half shafts and front wheels in a front-wheel-drive vehicle). Gears inside the transmission mechanism (101) change the vehicle's drive-wheel speed and torque in relation to engine speed and torque. The constant working of the transmission mechanism imparts severe shocks and vibrations on the transmission casing. Thus, causing surface cracks occurs on the surface of the transmission casing.
[0030] The transmission casing (100) has structurally three different parts. A cover (12) forming the canopy for the transmission mechanism. A first casing (11a) and a second casing (11b) further arranged in series housing the transmission mechanism (101). Thus the entire transmission casing (100) acts as a house enclosing the transmission mechanism (101).
[0031] The cover (12) is integrated with the first casing (11a) by coupling the outer periphery of the cover (12) and first casing (11a) with a plurality of a first transverse bolts (13a). The first transverse bolts (13a) are fastened in the transverse axis direction. The outer periphery of cover (12) coupling with the first casing (11a) is preferably elliptical in formation. Thus, plurality of first transverse bolts is fastened with the cover (12) and first casing (11a).
[0032] The first casing (11a) coupled in series with the cover (12) is mounted on the transmission mechanism (101) coupled with a first bolt inserted into the first bolt recess (14). The first bolt inserted into the first bolt recess (14) is preferably an idler shaft bolt fastening the first casing (11a) with an idler gear (17) shaft of the transmission mechanism (101). The first bolt inserted into the first bolt recess (14) is present on a lateral side of the first casing (11a) connecting with the idler gear shaft gear (17).
[0033] As previously mentioned, the first casing (11a) receives maximum vibrations and shocks during the functioning of the transmission mechanism, a reinforcement structure is introduced in the first casing to reduce the vibrations and shocks in certain zones especially towards the outer periphery of the first casing (11a).
[0034] Referring to Fig. 4, in the first casing (11a) following a flange (21) forming protrusion structure and a bulge structures (20) are disposed so that the overall deformation is minimum under the impact of shock loads leading to more strength in the first casing (11a) of the transmission housing.
[0035] The reinforcement structure illustrated in Fig. 3 includes, the first casing (11a) with the first bolt inserted into the first bolt recess (14) or the idler shaft bolt in center. The invention provides the plurality of flanges (21) formed adjacent and disposed laterally to each side of first bolt inserted into the first bolt recess (14). The plurality of flanges is arranged to extend in the transverse direction of the transmission casing (100). The plurality of flanges (21) as mentioned, originate adjacent and laterally from each side of the first bolt inserted into the first bolt recess (14) and are extended till an outer periphery (18a) of the first casing (11a).
[0036] The outer periphery (18a) of the first casing (11a) provides the platform to be mounted on the second casing (11b) through a plurality of second transverse bolt.
[0037] In the invention, one of the second transverse bolt inserted into the second bolt recess (13b) is disposed in-line or in queue with the first bolt inserted into the first bolt recess (14) eventually fastening the first casing (11a) with the second casing (11b). Within the purview of this invention, in-line placement of the second transverse bolt inserted into the second bolt recess (13b) is understood as accommodating it right below perpendicularly with the first bolt inserted into the first bolt recess (14) or the idler shaft bolt.
[0038] Further in the invention, as illustrated in Fig. 4, a bulge structure (20) is formed on the outer surface of the first casing (11a). The bulge structure (20) is disposed adjacent to each flanges (21).
[0039] In a characteristics feature of the invention, the outer periphery (18a) forms a triangular junction eventually obtaining a protruding triangular structure at the spot where the first casing accommodates the second bolt recess (13b) in-line with the first bolt recess (14). Inside the first casing, the idle gear sits at said triangular junction causing maximum deformation in this area. The aspect of the present invention to dispose the second bolt recess (13b) at said protruding triangular structure in-line (19) with the first bolt inserted into the first bolt recess (14) fastening the second casing (11b) with the first casing (11a) leads to prevention from cracking of the transmission casing.
[0040] It is an advantage of the invention thus, to introduce the reinforcement structure in form of flanges and in-line placement of bolts in transmission casing, preferably in the first casing. The reinforcement structure shall be disposed and arranged in a manner as disclosed in the present invention thus reducing the overall deformation by connecting the high stiffness zones under the impact of shock loads leading to more strength. The present invention provides minimum deformation of mode shapes eventually leading to better noise-vibration performance.
[0041] Referring to the Figures of the present invention, the following reference numeral table depict the elements of the invention:
11a First Casing
11b Second Casing
12 Cover
13a First Transverse Bolts
13b Second Bolt recess
14 Bolt recess
15 Input Shaft
16 Counter Shaft
17 Idler gear
18a Outer periphery of first casing
18b Protruded Triangular Structure
19 In line placement of Second Transverse Bolts
20 Bulge structure
21 Flanges
100 Transmission Casing
101 Transmission Mechanism
[0042]
[0043] 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.”
[0044] 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.

Claims:1. A reinforcement structure disposed on a transmission casing (100) housing a transmission mechanism (101), formed on an outer lateral surface on adjacent sides of a first bolt recess (14) receiving a first bolt connecting to an idler shaft gear (17) comprising of:
a plurality of flanges (21) arranged on each lateral side of the first bolt recess (14) extending transversely and, connecting adjacent periphery of a protruded triangular structure (18b) formed on the outer periphery (18a) of the transmission casing (100);
a second bolt recess (13b) arranged on the protruded triangular structure (18b) and disposed in line (19) with the first bolt recess (14).
2. The reinforcement structure as claimed in claim 1 wherein, a bulge structure (20) disposed adjacent to the plurality of flanges (21).
3. The reinforcement structure as claimed in claim 1 wherein, a cover (12) is coupled on a first casing (11a) with a plurality of first transverse bolts (13a) and the first casing (11a) is coupled with a second casing (11b) with plurality of the second transverse bolts.
4. The reinforcement structure as claimed in claim 1 wherein, the outer periphery (18) of the first casing (11a) accommodating the second transverse bolt fastening the second casing (11b) with the first casing (11a) arranged in the protruded triangular structure (18b).
5. The reinforcement structure as claimed in claim 4 wherein, the second transverse bolt are inserted into the second bolt recess (13b) fastening the second casing (11b) with the first casing (11a).