[0001] The present disclosure, in general, relates to mounting structure for electric motor and transmission unit and, more particularly, to a mounting structure for electric motor, transmission unit, and inverter unit all together for an electric vehicle.
BACKGROUND
[0002] Background description includes information that may be useful in understanding the present invention. It is not 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] Nowadays, electric vehicles are equipped with a battery to supply electricity or power to electric motor that provide input to the transmission unit of the vehicle. In the electric vehicle or hybrid vehicle, it is necessary to mount the electric motor, transmission unit, and inverter unit. Accordingly, mounting of the electric motor and inverter unit using minimum space is major concern for automobile manufactures.
[0004] In the existing art, several mounting structures exist where each structure has its own demerits. The existing mounting structures have below mentioned technical properties.
[0005] 1. Most of the mounting structures are connected to the floor of the vehicle that increases thickness of the floor and weight of the vehicle.
[0006] 2. Most of the existing mounting structures are permanent on the vehicle frame. Accordingly, the electric motor and inverter unit are mounted on the mounting structure of the vehicle which increases assembly time.

[0007] 3. Existing structures have high service time due to difficult accessibility of the electric motor or transmission unit or inverter unit.
[0008] Accordingly, there is a need in the state of the art to provide a mounting structure that can be easily assembled on the vehicle frame and can easily damp the vibrations of transmission unit, inverter unit, and electric motor.
OBJECTS OF THE DISCLOSURE
[0009] Some of the objects of the present disclosure, which at least one embodiment herein satisfy, are listed hereinbelow.
[0010] The principal object of the present invention is to provide a mounting structure for electric motor, transmission unit, and inverter unit in electric vehicle.
[0011] Another object of the present invention is to provide a mounting structure that can be easily mounted on vehicle frame.
[0012] Another object of the present invention is to provide a mounting structure for electric motor, transmission unit, and inverter unit that can mitigate loads and vibrations generated from the electric motor, transmission unit, and inverter unit.
[0013] Another object of the present invention is to provide a mounting structure for electric motor, transmission unit, and inverter unit that provides strength and stability during running condition of the vehicle.
[0014] These and other objects and advantages will become more apparent when reference is made to the following description and accompanying drawings.
SUMMARY
[0015] This summary is provided to introduce concepts related to a mounting structure for electric motor, transmission unit, and inverter unit for electric vehicle. 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.
[0016] In an embodiment, the present disclosure relates to mounting structure for electric motor, transmission unit, and inverter unit for a vehicle. The mounting structure comprises a front cross member and a rear cross member. The front cross member and the rear cross member are longitudinally spaced apart from each other in vehicle length direction. Further, the mounting structure includes two longitudinal support members that are provided in between the front cross member and the rear cross member and transversally spaced apart from each other in vehicle width direction. The front cross member has a right-hand side (RHS) bracket and a left-hand side (LHS) bracket that are transversally spaced apart from each other. Further, a right-hand side (RHS) mounting bracket and a left-hand side (LHS) mounting bracket are connected to the RHS bracket and the LHS bracket respectively at one end and other ends are connected with the electric motor and transmission unit. Similarly, the rear cross member has a rear side bracket that is connected to a rear side mounting bracket through a rubber bush at one end and other end is connected to the electric motor and transmission unit. Further, the two longitudinal support members are provided with mounting brackets to support the inverter unit on top of the two longitudinal support members. Accordingly, the present mounting structure forms a cradle type structure to hold the electric motor, transmission unit, and inverter unit all together in a single place. Further, each member is angularly optimized as per layout of the vehicle to damp or cater the vibrations originated from the electric motor, transmission unit, and inverter unit.
[0017] In an aspect, one of the two longitudinal support members is mounted on the front cross member in between the right-hand side (RHS) mounting bracket and the left hand side (LHS) mounting bracket to cater loads and vibrations.
[0018] In an aspect, at least two mounting brackets are longitudinally spaced apart from each other mounted on each of the two longitudinal support members to receive an inverter unit on top of the two longitudinal support members.

[0019] In an aspect, the right-hand side (RHS) mounting bracket, the left hand side (LHS) mounting bracket, and the rear side mounting bracket are connected with the electric motor and transmission unit via a plurality of bolts.
[0020] 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
[0021] The illustrated embodiments of the subject matter 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 methods that are consistent with the subject matter as claimed herein, wherein:
[0022] Fig. 1 illustrates mounting structure of electric motor, transmission, and inverter, in accordance with an embodiment of the present subject matter;
[0023] Fig. 2 illustrates structure of rear cross member of the mounting structure as shown in fig. 1;
[0024] Fig. 3 illustrates the mounting structure with mounting of electric motor and transmission unit, in accordance with an embodiment of the present subject matter; and
[0025] Fig. 4 and 5 illustrate mounting of the mounting structure having inverter unit with longitudinal members of the vehicle frame, in accordance with an embodiment of the present subject matter.
[0026] 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
[0027] The detailed description of various exemplary embodiments of the
5 disclosure is described herein with reference to the accompanying drawings. It
should be noted that the embodiments are described herein in such details as to
clearly communicate the disclosure. However, the amount of details provided
herein is not intended to limit the anticipated variations of embodiments; on the
contrary, the intention is to cover all modifications, equivalents, and alternatives
10 falling within the spirit and scope of the present disclosure as defined by the
appended claims.
[0028] It is also to be understood that various arrangements may be devised
that, although not explicitly described or shown herein, embody the principles of
the present disclosure. Moreover, all statements herein reciting principles, aspects,
15 and embodiments of the present disclosure, as well as specific examples, are
intended to encompass equivalents thereof.
[0029] The terminology used herein is for the purpose of describing particular
embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms “a",” “an” and “the” are intended to include the
20 plural forms as well, unless the context clearly indicates otherwise. It will be
further understood that the tennis “comprises,” “comprising,” “includes” and/or “including,” when used herein, specify the presence of stated features, integers, steps, operations, elements and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements,
25 components and/or groups thereof.
[0030] It should also be noted that in some alternative implementations, the
functions/acts noted may occur out of the order noted in the figures. For example, two figures shown in succession may, in fact, be executed concurrently or may
6

sometimes be executed in the reverse order, depending upon the functionality/acts involved.
[0031] Unless otherwise defined, all terms (including technical and scientific
terms) used herein have the same meaning as commonly understood by one of
5 ordinary skill in the art to which example embodiments belong. It will be further
understood that terms, e.g., those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
10 [0032] These and other advantages of the present subject matter would be
described in greater detail with reference to the following figures. It should be noted that the description merely illustrates the principles of the present subject matter. It will thus be appreciated that those skilled in the art will be able to devise various arrangements that, although not explicitly described herein, embody the
15 principles of the present subject matter and are included within its scope.
[0033] In the subsequent figures arrow R indicates vehicle right side of the
vehicle, arrow L indicates left side of the vehicle, arrow F indicates front side of the vehicle and arrow rear side indicates rear side of the vehicle.
[0034] As explained in above sections, major challenge in front of the experts
20 is to mount the electric motor, transmission unit, and inverter unit in small
available space in electric vehicle. In the existing mounting structures,
serviceability and assembly of the electric motor, transmission unit, and inverter
are major problems. The present invention solves the above technical problem by
providing a mounting structure having electric motor, transmission unit, and
25 inverter unit mounted via a plurality of bolts on longitudinal members of the
vehicle frame that can easily be assembled and dis-assembled with the vehicle frame.
[0035] Referring to figure 1 that illustrates mounting structure for electric
motor, transmission, and inverter in the vehicle. The mounting structure 100
7

comprises a front cross member 101 and a rear cross member 102 longitudinally
spaced apart from the front cross member 101 in vehicle length direction. The
mounting structure 100 further includes two longitudinal support members 103,
104 that are provided in between the front cross member 101 and the rear cross
5 member 102. The two longitudinal support members 103, 104 are transversally
spaced apart from each other in vehicle width direction (L and R).
[0036] The front cross member 101 has a right-hand side (RHS) bracket 106
and a left-hand side (LHS) bracket 105 that are transversally spaced apart from each other. The RHS bracket 106 and the LHS bracket 105 are welded on the
10 front cross member 101 and downwardly projecting from the front cross member
101 accordingly. To avoid any ambiguity these can be referred as the RHS downwardly projecting bracket 106 and the LHS downwardly projecting bracket 105. The RHS downwardly projecting bracket 106 and the LHS downwardly projecting bracket 105 are projected in downward direction toward ground.
15 Further, a right-hand side (RHS) mounting bracket 108 and a left-hand side LHS
mounting bracket 107 are connected to the RHS downwardly projecting bracket
106 and the LHS downwardly projecting bracket 105 at one end. The right-hand
side (RHS) mounting bracket 108 and the left-hand side LHS mounting bracket
107 are connected with the electric motor and transmission unit (300) at other end
20 (explained in figures 3, 4, and 5).
[0037] In an aspect, the RHS mounting bracket 108 is connected with the
RHS downwardly projecting bracket 106 through a rubber bush 106a via bolt to
damp the vibrations originated from the electric motor and transmission unit.
Similarly, the LHS mounting bracket 107 is connected with the LHS downwardly
25 projecting bracket 105 through a rubber bush 105a via bolt to damp the vibrations.
[0038] A rear side downwardly projecting bracket 113 is mounted on the rear
cross member 102. Further, a rear side mounting bracket 109 is connected to the rear side downwardly projecting bracket 113 through a rubber bush 113a (as shown in figure 3) at one end. The rear side downwardly projecting bracket 113 is
8

connected with the electric motor and transmission unit 300 at other end (explained in figures 3, 4, and 5).
[0039] As shown in the figure 1 and 2, the front cross member 101 is straight
member. The rear cross member 102 is angularly bent cross member. Further,
5 shape of the rear cross member 102 is in U shape with extended end portions. As
shown in the figure 2, the rear cross member 102 has base 102a that has rear downwardly projecting bracket 113 and rear downwardly projecting brackets 111 for longitudinal support members 104, 103. The portions 102b of the rear cross member 102 extend at an angle from the base 102a to accommodate the mounting
10 structure 100 under the vehicle. Further, the end portions 102c of the rear cross
member 102 extend parallelly to the base 102a from the portions 102b. In an embodiment, the rear cross member 102 may be straight as per vehicle layout. In an embodiment, the height ‘h’ of the portions 102b is unequal at both sides. Further, in another embodiment, the height ‘h’ of both the portions 102b may be
15 equal that corresponds to layout of the vehicle.
[0040] The front cross member 101 has a mounting bracket 110 at transverse
ends to mount the mounting structure 100 on longitudinal members (shown in
figure 3, 4, 5) of the vehicle. Similarly, the rear cross member 102 has a mounting
bracket 110 at transverse ends (lateral ends) to mount the mounting structure 100
20 on longitudinal members (shown in figure 3, 4, 5) of the vehicle.
[0041] As shown in the figure 1 and 3, one longitudinal member 104 is
mounted on the front cross member 101 in between the right-hand side (RHS)
mounting bracket 108 and the left-hand side (LHS) mounting bracket 107. The
two longitudinal support members 103, 104 are welded on the front cross member
25 101 through U shaped brackets. In an embodiment, the two longitudinal support
members 103, 104 may be directly welded on the front cross member 101. Further, the two longitudinal support members 103, 104 are mounted on the rear cross member 102 through two downwardly projecting brackets 111. The rear side downwardly projecting bracket 113 is provided in between the downwardly
9

projecting brackets 111 of the longitudinal support members 103, 104. The two
longitudinal support members 103, 104 are inclined from the front cross member
101 to the rear cross member 102. In another embodiment, the two longitudinal
support members 103, 104 may be at same plane at both ends. These
5 modifications are provided in the structure based on the layout of the vehicle.
[0042] Referring to figure 1, 4, and 5, at least two mounting brackets 112 are
mounted on each of the two longitudinal support members 103, 104 to receive an inverter unit 400 on top. The at least two mounting brackets 112 are longitudinally spaced apart from each other on the two longitudinal support members 103, 104.
10 The two longitudinal support members 103, 104 are inclined from the front cross
member 101 to the rear cross member 102 to accommodate the inverter unit 400 at top so that height of the inverter unit 400 can be optimized. By mounting the inverter unit 400 on the two longitudinal support members 103, 104 and the electric motor and transmission unit 300 in the cross members 101, 102, weight of
15 the parts is properly distributed among the cross members 101, 102 and the two
longitudinal support members 103, 104. Since, electric motor and transmission unit 300 are dynamic part and inverter unit is non-dynamic part, there is an additional advantage of mounting inverter unit 400 on the two longitudinal support members 103, 104 because transfer of dynamic loads from electric motor
20 and transmission unit 300 to the inverter unit through the cross members 101, 102
is minimized by mounting inverter unit 400 on the two longitudinal support members 103, 104 instead of mounting on the cross members 101, 102. In other embodiment, the electric motor, transmission unit (300), and inverter unit (400) are mounted orthogonal to each other.
25 [0043] Reading figure 1 with combination of figure 4 and 5, a mounting
bracket 110 is provided at both transverse ends of the front cross member 101 to
mount the mounting structure 100 on longitudinal members 201, 202 of the
vehicle. Similarly, a mounting bracket 110 is provided at both transverse ends of
the rear cross member 102 to mount the mounting structure 100 on longitudinal
30 members 201, 202 of the vehicle. The mounting structure 100 can be mounted on
10

the longitudinal members 201, 202 of the vehicle via a plurality of bolts and screws. Further, vibrational loads from electric motor and transmission unit 300 are transferred through cross members 101, 102 to vehicle longitudinal members 201,202 which are load bearing members of the vehicle.
5 [0044] Considering figure 1 and figure 4 together, the right-hand side (RHS)
mounting bracket 108, the left hand side (LHS) mounting bracket 107, and the rear side mounting bracket 109 are connected with the electric motor and transmission unit 300 via a plurality of bolts.
[0045] In an aspect, the RHS mounting bracket 108 and the LHS mounting
10 bracket 107 extend toward the rear cross member 102 in longitudinal direction.
The mounting members are connected through rubber bushes to cater the vibrations in vertical direction due to weight of the electric motor; and up and down motion of the vehicle.
[0046] In an aspect, the electric motor, transmission unit, and inverter unit are
15 mounted orthogonal to each other
[0047] As explained above, the present mounting structure act as a separate
structure that can be assembled separately from the vehicle frame. Further, the electric motor, the transmission unit, and the inverter unit are mounted on the structure. After mounting the electric motor, the transmission unit, and the
20 inverter unit in the mounting structure, the whole structure is moved to assembly
line and directly mounted on the longitudinal members of the vehicle frame through mounting brackets provided at transverse ends of the structure. Accordingly, very less time is consumed to assemble the present structure with the vehicle frame. Further, during service, the mounting structure can easily be
25 disassembled from the vehicle frame by loosening the bolts of the mounting
brackets and assembled back to the vehicle frame by tightening the bolts of the mounting brackets. Thus, the present invention provides a compact and rigid structure for mounting electric motor, transmission unit and inverter unit to the vehicle frame which provides strength against vibrational loads from electric
11

motor and transmission unit and is also easy to assemble and disassemble during service.
[0048] 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
5 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
10 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
15 by the indefinite articles “a” or “an” limits any particular claim containing such
introduced claim recitation to inventions 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
20 true for the use of definite articles used to introduce claim recitations. In addition,
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
25 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 a 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
30 together, A and C together, B and C together, and/or A, B, and C together, etc.).
12

In those instances where a convention analogous to "at least one of A, B, or C, etc." is used, in general such a 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."
[0049] 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.

We claim:

A mounting structure (100) for electric motor, transmission unit (300), and inverter unit (400) for a vehicle comprising:
a front cross member (101);
a rear cross member (102) longitudinally spaced apart from the front cross member (101) in vehicle length direction;
two longitudinal support members (103, 104) provided in between the front cross member (101) and the rear cross member (102), wherein the two longitudinal support members (103, 104) are transversally spaced apart from each other in vehicle width direction;
a right-hand side (RHS) bracket (106) and a left-hand side (LHS) bracket (105) are mounted on the front cross member (101) and transversally spaced apart from each other on the front cross member (101);
a right-hand side (RHS) mounting bracket (108) and a left-hand side (LHS) mounting bracket (107) are connected to the RHS bracket (106) and the LHS bracket (105) at one end and other end connected with the electric motor and transmission unit (300);
a rear side bracket (113) mounted on the rear cross member (102);
a rear side mounting bracket (109) connected to the rear side bracket (113) through a rubber bush (113a) at one end and other end is connected to the electric motor and transmission unit (300); and
at least two mounting brackets (112) longitudinally spaced apart from each other are mounted on each of the two longitudinal support members (103, 104) to receive an inverter unit (400) on top of the two longitudinal support members (103, 104).

The mounting structure (100) as claimed in claim 1, wherein the RHS bracket (106), the LHS bracket (105), and the rear side bracket (113) are downwardly projecting from the front cross member (101) and the rear cross member (102).
The mounting structure (100) as claimed in claim 1, wherein one longitudinal member (104) is mounted on the front cross member (101) in between the right-hand side (RHS) mounting bracket (108) and the left-hand side (LHS) mounting bracket (107).
The mounting structure (100) as claimed in claim 1, wherein the two longitudinal support members (103, 104) are welded on the front cross member (101) through U shaped brackets.
The mounting structure (100) as claimed in claim 1, wherein the two longitudinal support members (103, 104) are mounted on the rear cross member (102) through two downwardly projecting brackets (111).
The mounting structure (100) as claimed in claim 1, wherein the right-hand side (RHS) mounting bracket (108), the left hand side (LHS) mounting bracket (107), and the rear side mounting bracket (109) are connected with the electric motor and transmission unit (300) via a plurality of bolts.
The mounting structure (100) as claimed in claim 1, wherein the rear side bracket (113) is provided in between the downwardly projecting brackets (111) of the longitudinal support members (103, 104).
The mounting structure (100) as claimed in claim 1, wherein the RHS mounting bracket (108) and the LHS mounting bracket (107) extend towards the rear cross member (102) in longitudinal direction.
The mounting structure (100) as claimed in claim 1, wherein the RHS mounting bracket (108) connected with the RHS bracket (106) through a rubber bush (106a) via bolts.

The mounting structure (100) as claimed in claim 1, wherein the LHS mounting bracket (107) connected with the LHS bracket (105) through a rubber bush (105a) via bolts.
The mounting structure (100) as claimed in claim 1, wherein a mounting bracket (110) is provided at transverse ends of the front cross member (101) to mount the mounting structure (100) on longitudinal members (201, 202) of the vehicle.
The mounting structure (100) as claimed in claim 1, wherein a mounting bracket (110) is provided at transverse ends of the rear cross member (102) to mount the mounting structure (100) on longitudinal members (201, 202) of the vehicle.
The mounting structure (100) as claimed in claim 1, wherein the front cross member (101) is straight.
The mounting structure (100) as claimed in claim 1, wherein the rear cross member (102) is angularly bent cross member.
The mounting structure (100) as claimed in claim 1, wherein the two longitudinal support members (103, 104) are inclined from the front cross member (101) to the rear cross member (102).
The mounting structure (100) as claimed in claim 1, wherein the electric motor, transmission unit (300), and inverter unit (400) are mounted orthogonal to each other.