FORM 2
THE PATENTS ACT, 1970
(39 OF 1970)
AND
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(See Section 10; rule 13)
TITLE OF THE INVENTION
“A SERVICEABLE AND MODULAR ENGINE MOUNT FOR A MOTOR VEHICLE”
APPLICANT(S)
TATA MOTORS LIMITED
Bombay House, 24 Homi Mody Street,
Hutatma Chowk, Mumbai 400 001, Maharashtra, India; an Indian company.
PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner in which it is to be performed.

A SERVICEABLE AND MODULAR ENGINE MOUNT FOR A MOTOR VEHICLE
FIELD OF THE INVENTION
[0001] The present invention relates to a structure of an engine mount, and more
specifically related to a PU engine mount installed between an engine of vehicle and the passenger compartment of the vehicle to block the vibration of the engine to the passenger compartment and provide better Noise, vibration, and harshness (NVH).
BACKGROUND OF THE INVENTION
[0002] Generally a primary function of an engine mount in a vehicle is to carry
engine load in all driving conditions and isolate vibrations which are getting transferred to passenger compartment of the vehicle through the engine and road. In order to give stable support while reducing vibration transmission to the vehicle body, vibration damping support on the vehicle body is provided at different locations using the engine mount.
[0003] FIGS. 1a-1c illustrious conventional engine mounts that uses natural rubber. It is molded on the metal components of the engine mounts and is used in the vehicle assemblies for isolation and load carrying purpose. Due to this the powertrain specific mounts needs to be designed based on the powertrain inertia, mass and Centigram (cg) properties. Hence the conventional engine mounts has fixed structure and rubber is molded on the metal components. If any failure comes in the conventional engine mount rubber then the entire part need to be replaced. The conventional design does not allow service of the engine mounts as all the components are fixed.

[0004] Hence there remains a need to provide a modular structure of an engine mount that can be easily serviceable for better NVH.
OBJECT OF THE INVENTION
[0005] The principal object of the embodiments herein is to provide a serviceable and modular engine mount for a motor vehicle.
[0006] Yet another object of the embodiments herein is to provide a PU engine mount installed between an engine of vehicle and the passenger compartment of the vehicle to block the vibration of the engine to the passenger compartment and provide better Noise, vibration, and harshness (NVH).
SUMMARY OF THE INVENTION
[0007] In one aspect the object is satisfied by providing an engine mount for a motor vehicle. The engine mount includes an upper body, a lower body, a metal device mounted between the upper body and the lower body a first polyurethane circumferentially mounted on an upper end of the metal device, and a second polyurethane circumferentially mounted on a lower end of the metal device.
[0008] In an embodiment, the first polyurethane and the second polyurethane are replaceable as per powertrain mass, Centigram (cg), and inertia. The upper body includes an upper cap, and a plastic insert attached to the upper cap along a circumferential direction. The lower body includes a bottom plate connected to the second polyurethane; and a mounting plate connected to the bottom plate and the metal device comprises a metal insert with a bolt.
[0009] In an embodiment, the upper body includes a nut, a threaded sleeve attached to the nut and is connected to an upper end of the first polyurethane. The lower body comprises a steel sleeve and the metal device is a metal cup.

[0010] These and other aspects of the embodiments herein will be better appreciated and understood when considered in conjunction with the following description and the accompanying drawings. It should be understood, however, that the following descriptions, while indicating preferred embodiments and numerous specific details thereof, are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the embodiments herein without departing from the spirit thereof, and the embodiments herein include all such modifications.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] The proposed engine mount are illustrated in the accompanying drawings, throughout which like reference letters indicate corresponding parts in the various figures. The embodiments herein will be better understood from the following description with reference to the drawings, in which:
[0012] FIGS. 1a-1c illustrious conventional engine mounts that uses natural rubber;
[0013] FIG. 2a illustrates an exploded perspective view of the engine mount, according to a first embodiment as disclosed herein;
[0014] FIG. 2b illustrates an exploded perspective view of the engine mount as shown in the FIG. 2a, according to the first embodiment as disclosed herein;
[0015] FIG. 2c illustrates an assembled view of an engine mount as shown in the FIGS. 2a-2b, according to the first embodiment as disclosed herein;
[0016] FIG. 3a illustrates an exploded perspective view of the engine mount, according to a second embodiment as disclosed herein;

[0017] FIG. 3b illustrates an exploded perspective view of the engine mount as shown in the FIG. 3a, according to the first embodiment as disclosed herein;
[0018] FIG. 3c illustrates an assembled view of an engine mount as shown in the FIGS. 3a-3b, according to the second embodiment as disclosed herein.
DETAILED DESCRIPTION OF THE INVENTION
[0019] The embodiments herein and the various features and advantageous details thereof are explained more fully with reference to the non-limiting embodiments that are illustrated in the accompanying drawings and detailed in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. Also, the various embodiments described herein are not necessarily mutually exclusive, as some embodiments can be combined with one or more other embodiments to form new embodiments. The term “or” as used herein, refers to a non-exclusive or, unless otherwise indicated. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein can be practiced and to further enable those skilled in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.
[0020] Referring now to the drawings, and more particularly to FIGS. 2 through 3, where similar reference characters denote corresponding features consistently throughout the figures, there are shown preferred embodiments.
[0021] The proposed engine mount (1) are illustrated in the accompanying drawings, throughout which like reference letters indicate corresponding parts in the various figures. The embodiments herein will be better understood from the following description with reference to the drawings, in which:

[0022] FIGS. 1a-1c illustrious conventional engine mount (1)s that uses natural rubber;
[0023] FIG. 2a illustrates an exploded perspective view of the engine mount (1), according to a first embodiment as disclosed herein. The engine mount includes an upper body (2), a lower body (3), a metal device (4) mounted between the upper body (2) and the lower body (3), a first polyurethane (5) circumferentially mounted on an upper end of the metal device (4), and a second polyurethane (6) circumferentially mounted on a lower end of the metal device (4).
[0024] In the first embodiment, the upper body (2) includes an upper cap (7), and a plastic insert (8) attached to the upper cap (7) along a circumferential direction. The lower body (3) includes a bottom plate (9) connected to the second polyurethane (6), and a mounting plate (10) connected to the bottom plate (9). The metal device (4) includes a metal insert (11) with a bolt.
[0025] FIG. 2b illustrates an exploded perspective view of the engine mount (1) as shown in the FIG. 2a, according to the first embodiment as disclosed herein. Similar, FIG. 2c illustrates an assembled view of an engine mount (1) as shown in the FIGS. 2a-2b, according to the first embodiment as disclosed herein. The conventional mounts as shown in the FIG. 1a has fixed structure and rubber is molded on metal component. In the proposed structure of the engine mount (1), the first polyurethane (5) and the second polyurethane (6) are replaceable as per powertrain mass, Centigram (CG), and inertia. The modular structure of the engine mount (1) allow replacement of only the first polyurethane (5) and the second polyurethane (6) as shown in the FIGS. 2a-2b and the same structure can be carried over to vehicle platform for different powertrains. Also only the stiffness of the first polyurethane (5) and the second polyurethane (6) changes thereby allowing the same structure to be used for different power trains on same vehicle platform. Unlike to the engine mounts as shown in the FIG. 1a, there is no mounding process involved in the proposed engine mount as shown in the FIG. 2a.

[0026] FIG. 3a illustrates an exploded perspective view of the engine mount (1), according to a second embodiment as disclosed herein. The engine mount includes an upper body (2), a lower body (3), a metal device (4) mounted between the upper body (2) and the lower body (3), a first polyurethane (5) circumferentially mounted on an upper end of the metal device (4), and a second polyurethane (6) circumferentially mounted on a lower end of the metal device (4).
[0027] In the second embodiment, the upper body (2) includes a nut (12), and a threaded sleeve (13) attached to the nut (12) and is connected to an upper end of the first polyurethane (5). The lower body (3) includes a steel sleeve (14). The metal device (4) is a metal cup (15).
[0028] FIG. 3b illustrates an exploded perspective view of the engine mount as shown in the FIG. 3a, according to the first embodiment as disclosed herein. Similarly, the FIG. 3c illustrates an assembled view of an engine mount (1) as shown in the FIGS. 3a-3b.
[0029] The conventional engine mounts as shown in the FIG. 1b has fixed structure and rubber is molded on metal component. Also polyurethane with different intensities cannot be placed in the assembly of the engine mount. In the proposed structure of the engine mount (1), the first polyurethane (5) and the second polyurethane (6) are replaceable as per powertrain mass, Centigram (CG), and inertia. Also the polyurethane with different intensities can be placed in the assemblies of the engine mount (1) as per the requirement of the customer. If any failure comes in the conventional engine mounts as shown in the FIG. 1b, all the parts of the engine mount need to be replaced. The modular structure of the proposed engine mount (1) allows replacement of only the first polyurethane (5) and the second polyurethane (6) as shown in the FIGS. 3a-3b and the same structure can be reused for different powertrains on same vehicle platform.

[0030] Further, the proposed engine mounts as shown in the FIGS 2a-2c and 3a-3c shows higher performance than the general automotive anti-vibration rubber based engine mounts as shown in the FIGS. 1a-1c and can block the vibration of the engine to the vehicle passenger compartment. With the use of polyurethane mounts idle vibration, 3G WOT, Tip in/out, key can be drastically improved. Weight of the whole assemble of the engine mount is reduced (example approximately by 30%) when compared to conventional engine mounts as shown in the FIGS. 1a-1c. Durability of the polyurethane as shown in the FIGS 2a-2c and 3a-3c is better than the natural rubber as shown in the FIGS. 1a-1c. Further, interior acoustic of the vehicle can also be improved when compared to the rubber as used in the conventional engine mounts.
[0031] 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 embodiments as described herein.

[0032] LIST TO REFERENCE NUMERALS:

Sr. No. Description
1 engine mount
2 upper body
3 lower body
4 metal device
5 first polyurethane
6 first polyurethane
7 upper cap
8 plastic insert
9 bottom plate
10 mounting plate
11 metal insert
12 nut
13 threaded sleeve
14 steel sleeve
15 metal cup

WE CLAIMS:
1. An engine mount (1) for a motor vehicle, wherein the engine mount (1)
comprises:
an upper body (2);
a lower body (3);
a metal device (4) mounted between the upper body (2) and the lower body (3);
a first polyurethane (5) circumferentially mounted on an upper end of the metal device (4); and
a second polyurethane (6) circumferentially mounted on a lower end of the metal device (4).
2. The engine mount (1) as clamed in claim 1, wherein the first polyurethane (5) and the second polyurethane (6) are replaceable as per powertrain mass, Centigram (CG), and inertia.
3. The engine mount (1) as clamed in claim 1, wherein the upper body (2) comprises:
an upper cap (7); and
a plastic insert (8) attached to the upper cap (7) along a circumferential direction.
4. The engine mount (1) as clamed in claim 1, wherein the lower body (3)
comprises:
a bottom plate (9) connected to the second polyurethane (6); and a mounting plate (10) connected to the bottom plate (9).
5. The engine mount (1) as clamed in claim 1, wherein the metal device (4)
comprises a metal insert (11) with a bolt.

6. The engine mount (1) as clamed in claim 1, wherein the upper body (2)
comprises:
a nut (12); and
a threaded sleeve (13) attached to the nut (12) and is connected to an upper end of the first polyurethane (5).
7. The engine mount (1) as clamed in claim 1, wherein the lower body (3) comprises a steel sleeve (14).
8. The engine mount (1) as clamed in claim 1, wherein the metal device (4) is a metal cup (15).