DESC:
TECHNICAL FIELD OF THE INVENTION:
The present invention relates to a mount structure for a powertrain for a vehicle.

BACKGROUND OF THE INVENTION
In a front wheel drive type vehicle, an engine is placed on the front of a vehicle and the power train unit is placed horizontally (transverse) on a vehicle body frame. The front body of the vehicle includes a front bulkhead placed at the foremost part, and side frames extends from the left and right of the bulkhead to the front and rear of the vehicle body. The front body also includes an obliquely upper portion on the vehicle width direction outside of these side frames, and a vehicle body support pin.
Reduction in rigidity of the side frames is essential in order to suppress the collision energy at the event of a vehicle collision and it becomes automatically configured to be a crushable in application.
The powertrain is a unit which generally includes an engine and a transmission unit directly connected to the engine. The powertrain is suspended on the vehicle body frame via. Mount. There are two main components to mount the transmission mount bracket and the mount itself (RH and LH) .The attachment bracket connecting the mount and the powertrain unit is either made of steel or alloy or Aluminum. The mount consists of a rubber bushing or urethane which is bolted, welded, or chemically bonded to the transmission bracket. The bracket secures the transmission to the vehicle. The rubber or urethane bushing isolates the powertrain vibration and reduces noise levels inside the cabin of the vehicle.
Most of the vehicles have two to three engine mounts. These three mountings are utilized for suspending the powertrain by placing two mountings on right and left side portion of the top sider of the engine and a bottom mount placed at the lower right side of the engine which is also called as a roll restrictor. The roll restrictor is a horizontally oriented section which is connected with the bottom portion of the engine at one end and the other end to a sub frame or cross member also known as K frame at another end.
It has been observed that the existing three point mounting structure for the front drive type vehicle having a four cylinder engine of cubic capacity ranging between 1.5 Litre to 2.2 Litre has higher surface velocities, higher noise levels and higher vibrations depending upon the vehicle architecture and the mounting structure. Further, while shifting the transmission the vibration and noise also increases.
Therefore, there is a requirement to reduce noise, vibration and harshness (NVH) of the engine and provide a suitable mounting structure by allowing controlled movement of the engine with defined rubber volume.

SUMMARY OF THE INVENTION
The present invention provides a mount structure for powertrain of a vehicle that includes a left-hand side mount connected with an upper portion of the powertrain.
A right-hand side mount is connected with the upper portion of the powertrain. A left-hand side roll restrictor is disposed at a bottom side of the powertrain. A right-hand side roll restrictor is connected with the drive shaft bracket at one end and with a K-frame or subframe of the vehicle at another end. The left-hand side mount is connected with the upper portion of the powertrain via a left-hand side mounting bracket and to a left hand side insulator engine mount. The right-hand side mount is connected with the upper portion of the powertrain via, a right-hand side mounting bracket connected with the right side upper portion of the powertrain. The left-hand side roll restrictor is disposed at a bottom side of the powertrain and is connected with the subframe or K frame assembly. The right-side roll restrictor comprises a first body positioned a spaced apart from a second body. The first and second bodies are embedded in a frame. The first and second bodies have a resilient material placed inside the bodies. The second body is connected to the driveshaft bracket a bolt and nut joint and the first body is connected with the K-frame or subframe of the vehicle by nut welded at K–Frame.

BRIEF DESCRIPTION OF THE DRAWINGS:
FIG. 1 is an isometric view showing a schematic layout of mount structures of powertrain of a vehicle in accordance with an embodiment of the present invention;
FIG. 2 shows a mount structure on left side disposed at the bottom side of the powertrain and connected with the subframe or K frame assembly
FIG. 3 shows a mount structure on a right side attached between the drive shaft bracket and subframe (K frame) in accordance with an embodiment of the present invention;
FIG. 4 shows an isometric view of the roll restrictor (LH) in accordance with an embodiment of the present invention; and
FIGS. 5A, 5B show a front view of the roll restrictor (RH) in accordance with an embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION:
Embodiments are provided so as to thoroughly and fully convey the scope of the present disclosure to the person skilled in the art. Numerous details are set forth relating to specific components to provide a complete understanding of embodiments of the present disclosure. It will be apparent to the person skilled in the art that the details provided in the embodiments should not be construed to limit the scope of the present disclosure. In some embodiments, well-known processes, well-known apparatus structures, and well-known techniques are not described in detail.
The present invention discloses a solution to the problem of increased NVH of an engine by providing a mounting assembly for a powertrain having a four point mount attachment position to isolate the vibrations and noise levels and having the required durability.
The invention discloses a lower right-side mounting called as roll restrictor (Fourth Mount) which is disposed at drive shaft bracket of the transmission box at one side. The roll restrictor is attached to a subframe or K-frame at another side. It is provided that the fourth point mounting structure provides a reduction in vehicle idle vibration and also additional controlled powertrain displacement. The roll restrictor mitigates the vibration levels to control the powertrain displacement. The Roll-restrictor reduces the amount of engine roll/movement during hard acceleration and gear shifting. The roll restrictors mounted at the bottom side on left hand side and right hand side ensures that the engine vibrations and displacement are minimized.
In accordance with an embodiment of the present invention, the roll restrictor is the fourth mount of the powertrain mounting structure of a vehicle having a four-cylinder engine of cubic capacity ranging between 1.5 Litre to 2.2 Litre. The first and second mounts are placed at upper side of the power train at both of the sides and connected with the vehicle body and a third mount is placed at bottom portion of the powertrain.
Embodiments, of the present disclosure, will now be described with reference to the accompanying drawing.
Referring to FIGS. 1-5B, a mount structure of powertrain (100) of a vehicle in accordance with an embodiment of the present invention is provided. The mount structure comprises a left-hand side mount (102) connected with the upper portion of the powertrain (100) via, left hand side mounting bracket (104) and to a left-hand side insulator engine mount (103). A right-hand side mount (106) is connected with the upper portion of the powertrain (100) via, right hand side mounting bracket (108) connected with the right-side upper portion of the powertrain (100). A left-hand side roll restrictor (110) is disposed at the bottom side of the powertrain (100) and connected with the subframe or K frame assembly (112) via a left roll restrictor bracket (111). A right-hand side roll restrictor (114) is connected with the drive shaft bracket at first end (202) thereof and with the K-frame or subframe (112) of the vehicle at second end (204) thereof.
The right-side roll restrictor (114) provides a four point mounting structure to a vehicle which enhances the stability of the engine mounted and results into reduction of the engine vibrations and the noise levels. The right-hand side roll restrictor (114) controls the powertrain displacement and thus mitigates the vibrations produced during hard acceleration and gear shifting conditions.
Referring to FIG. 1 and FIG. 5A, 5B, a structure of right-side roll restrictor (114) attached between the drive shaft bracket and subframe or K frame (112) in accordance with an embodiment of the present invention is disclosed. The right-side roll restrictor (114) includes two substantially circular bodies (202, 204) integrated in a frame (206). A first body (201) is approximately double the size of second body (202). The first and second body (202, 204) are spaced apart from each other and are embedded in a frame (206) and has a resilient material (208) placed inside the bodies (202, 204). In an embodiment, the resilient material (208) is NR rubber. The second body (204) is connected to the drive-shaft bracket via. fastening means preferably by a Bolt and Nut joint (210). The first body (202) of the right-side roll restrictor (114) is connected with the K-frame or subframe (112) of the vehicle via. fastening means such as by nut welded at K–Frame (112). The right-side roll restrictor (114) is a serviceable part and can be removed and refitted whenever required.
In accordance with an embodiment of the present invention, the right-side roll restrictor (114) (fourth mount) is made of aluminium and the same is collapsible in the event of the vehicle collision. The right-side roll restrictor (114) enhances the stability of the engine and improves the safety factor of the vehicle simultaneously. The right-side roll restrictor (114) or the torque rod breaks at 30KN during vehicle crash performance at the location (X-X) as shown in FIG. 5B. The right-side roll restrictor (114) reduces the amount of engine roll/movement during hard acceleration and gear changing. The resilient material i. e NR Rubber (208) located on right side roll restrictor (114) has defined static and dynamic stiffness which helps to reduce the powertrain idle & runup vibration and controls the powertrain (100) oscillation during all type of driving conditions.
While particular embodiments of the invention have been described, it is not intended that the invention be limited thereto, as it is intended that the invention be as broad in scope as the art will allow and that the specification be read likewise. Thus, while particular types of material have been disclosed, it will be appreciated that the embodiments may be manufactured with other types of materials as well. In addition, while particular types of roll restrictor have been disclosed, it will be understood that other types of roll restrictor can be used.
Many modifications may be made without departing from the basic spirit of the present invention. Accordingly, it will be appreciated by those skilled in the art that the invention may be practiced other than has been specifically described herein.
,CLAIMS:
1. A mount structure for powertrain (100) of a vehicle consisting:
a left-hand side mount (102) connected with an upper portion of the powertrain (100);
a right-hand side mount (106) connected with the upper portion of the powertrain (100);
a left-hand side roll restrictor (110) disposed at a bottom side of the powertrain (100); and
a right-hand side roll restrictor (114) connected with the drive shaft bracket at one end and with a K-frame or subframe (112) of the vehicle at another end.

2. The mount structure as claimed in claim 1, wherein the left-hand side mount (102) is connected with the upper portion of the powertrain (100) via a left-hand side mounting bracket (104) and to a left-hand side insulator engine mount (103).

3. The mount structure as claimed in claim 1, wherein the right-hand side mount (106) is connected with the upper portion of the powertrain (100) via, a right-hand side mounting bracket (108) connected with the right-side upper portion of the powertrain (100).

4. The mount structure as claimed in claim 1, wherein the left-hand side roll restrictor (110) is disposed at a bottom side of the powertrain (100) and connected with the subframe or K frame assembly (112).

5. The mount structure as claimed in claim 1, wherein the right-side roll restrictor (114) comprises a first body (201) positioned a spaced apart from a second body (204), the first and second bodies (202, 204) embedded in a frame (206).

6. The mount structure as claimed in claim 5, wherein the first and second bodies (202, 204) have a resilient material (208) placed inside the bodies (202, 204).

7. The mount structure as claimed in claim 5, wherein the second body (204) is connected to the driveshaft bracket a bolt and nut joint (210).

8. The mount structure as claimed in claim 5, wherein the first body (202) is connected with the K-frame or subframe (112) of the vehicle by nut welded at the K–Frame (112).