FIELD OF INVENTION:
[001] The present subject matter described herein, relates to mounting of internal combustion engine on vehicle body structure, and, in particular, to a torque rod structure for mounting the engine and to prevent the engine swing while torque is generated by the internal combustion engine. More particularly, the present subject matter relates to structure of torque rod to eliminate initial stresses which are generated in the torque rod during assembly of the internal combustion engine on the vehicle body.
BACKGROUND AND PRIOR ART:
[002] Generally, combustion engine and transmission system generate vibrations and noise. In order to prevent noise and vibrations in vehicles, the combustion engine and transmission systems are mounted on the vehicle body. The internal combustion engines and transmission systems are mounted on the vehicle chassis by means of a torque rod and other load carrying engine mounts.
[003] Fig. 1 illustrates assembly of engine and transmission case with the toque rod as known in the art. The assembly 100 has transmission body 102 and transmission case 104. The transmission case 104 is connected with a torque rod bracket 106 and torque rod 108. The torque rod 108 is connected with the torque rod bracket 106 from one end through a clamping bolt. Fig. 2a illustrates the structure of torque rod 108 as known in the art. The torque Rod 108 of an engine mounting system consists of two rubber bushes, i.e., small bush 108a and big bush 108b. Generally, the big bush 108b is mounted with chassis side sub-frame bracket of the vehicle body and the small bush 108a is fixed with torque rod bracket 106 of a transverse power train. The big bush 108b has vibration damping system to prevent entry of vibrations generated by the engine to the vehicle body. The purpose of torque-rod 108 is to control engine’s swing while torque is generated by the internal combustion engine.
[004] Fig. 2b illustrates the structure of the torque rod bracket for receiving the small bush of the torque rod 108. The torque rod bracket 106 is connected with the transmission case 104 from one end 106a and with the torque rod 108 from other end. The other end of the torque rod bracket 106 has a pair of arms 106b to receive the small bush 108a of the torque rod 108. When the small bush 108a is fitted in the pair of arms 106 of the torque rod bracket 106, a clamping bolt inserted through the rigid inner tube of the small bush 108a and the pair of arms 106b. The clamping bolt engaged with screw thread hole provided in one arm from the pair of arms. During assembly of the clamping bolt, the clamping bolt is tighten to match the profiles of the pair of arms (dimension: x+?x) 106b with profile of the small bush rigid inner tube (dimension x) 108a.
[005] Fig. 3 illustrates the assembly of torque rod with the torque rod bracket as known in the art. In this assembly, the torque rod 302 is fitted in the pair of arms of the torque rod bracket 304 with the help of clamping bolt 306.
[006] Problem in the art: The conventional torque rod brackets are bolted in such a way that there is an initial stress induced into the torque rod bracket due to compression of assembly tolerances. For example, the small bush’s inner tube of the torque rod has width X mm, as shown in figure 2a; and the inside size of transmission torque rod bracket to receive the small bush is X+?X, as shown in the fig. 2b. Where the ?X is the gap which is kept in design for clearance fit for easy assembly between torque rod bracket and small bush of the torque rod.
[007] When a clamping bolt is tightened, the clearance gap, i.e., ?X is compressed to zero to make surfaces of the torque rod bracket and small bush of the torque rod mate with each other. The compression of gap in the torque rod bracket causes stress within the structure of torque rod bracket. This stress is called initial stress. Initial stress is very critical regarding durability of the torque rod bracket 106.
[008] Japanese Patent JP5207524B2 discloses a bush holding part furnished with a press fitting hole H for a first vibration isolating bush B1 is provided on a mounting bracket, and a mounting part against an engine E of the mounting bracket and the bush holding part are integrally formed of an aluminum material. The first vibration isolating bush B1 is press fitted in the press fitting hole H, and a pair of holding plates is provided on one end part of the torque rod. A second vibration isolating bush B2 is provided on the other end part of the torque rod, a first internal cylinder provided on the first vibration isolating bush B1 is held by a pair of the holding plates of the torque rod, and the second vibration isolating bush B2 is connected to a vehicle body. In the Japanese patent the concept is to fix one end of the torque rod in inside a bracket which itself is made as an integrated part of the engine. Further, fixing bolt of the torque rod is aligned in the direction of the axis of the bush, thus resulting in initial stress inside the mating bracket. Figure 2c illustrates the structure of the Torque rod discloses in the Japanese patent.
[009] Though these known prior arts provide mounting of internal combustion engine and transmission system on the vehicle body, but the technical problem, i.e., initial stress exists in the prior arts. Above mentioned technical problem is not solved the known prior arts. The present subject matter of the invention provides a technical solution for overcoming the initial stress induced in the torque rod bracket during assembly.
OBJECTS OF THE INVENTION:
[0010] The principal objective of the present invention is to provide a torque rod structure to eliminate the stress being induced in the torque rod bracket during the assembly of torque rod.
[0011] Another object of the present subject matter is to provide a torque rod bracket structure for removing the initial stress from of the assembly of torque rod with the torque rod bracket.
[0012] Another object of the present subject matter is to provide a bracket structure at one end of the torque rod to remove the initial stress.
SUMMARY OF THE INVENTION:
[0013] The present subject matter discloses a torque rod assembly for mounting power train on vehicle body to remove initial stress generated in torque rod bracket during assembly. The torque rod component has a U shape bracket at one end and big bush at other end. Both the U shape bracket and the big bush are connected through a linkage rod by means of welding. Further, the torque rod assembly has a torque rod bracket with integrated small end bush having inner tube with flattened ends for face to face contact with the torque rod U bracket.
[0014] In order to further understand the characteristics and technical contents of the present subject matter, a description relating thereto will be made with reference to the accompanying drawings. However, the drawings are illustrative only but not used to limit scope of the present subject matter.
BRIEF DESCRIPTION OF THE DRAWINGS
[0015] 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 invention may admit to other equally effective embodiments. The detailed description is described with reference to the accompanying figures. In the figures, the left-most digit(s) of 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 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:
[0016] Fig. 1illustrates assembly of engine body with torque rod as known in the art;
[0017] Fig. 2a illustrates structure of torque rod as known in the art;
[0018] Fig. 2b illustrates structure of torque rod bracket as known in the art;
[0019] Fig. 2c illustrates the structure of clamping bolt as known in the art;
[0020] Fig. 2d illustrates the structure of torque rod as explained in Japanese patent JP5207524B2 as known;
[0021] Fig. 3 illustrates assembly of the torque rod and torque rod bracket as known in the art;
[0022] Fig. 4a illustrates assembly of the torque rod and torque rod bracket structure, in accordance with an embodiment of the present subject matter;
[0023] Fig. 4b illustrates structure of U shape bracket of the torque rod, in accordance with an embodiment of the present subject matter; and
[0024] Fig. 5 illustrates another view assembly of the torque rod and torque rod bracket structure, in accordance with an embodiment of the present subject matter.
[0025] 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.
DESCRIPTION OF THE PREFERRED EMBODIMENTS:
[0026] The subject matter disclosed herein relates to structure of torque rod assembly to mount power strain on vehicle body. The present torque rod assembly has a torque rod and torque rod bracket. The torque rod has big rubber bush at one end to mount the torque rod on the vehicle body or vehicle chassis. The other end of the torque rod has a ‘U’ shaped bracket which is attached on linkage rod of the torque rod. The ‘U’ shaped bracket has bilateral flanges extending from the base of the U shaped bracket. The bilateral flanges are bent and extend outwardly in perpendicular direction. The bent flanges have holes to receive clamping screws during assembly of torque rod with the torque rod bracket. On the other side, the torque rod bracket is attached to the transmission bracket of the vehicle from one side with bolts and other end has a rubber bush with a inner tube flattened at ends. The flattened ends of the inner tube have holes for bolting during assembly of torque rod with the torque rod bracket. In the present assembly, the torque rod is mounted with the torque rod bracket in same direction with bolts to remove the initial stress in the torque rod bracket. Previously, torque rod bracket was compressed during assembly and hence stress was induced in the torque rod bracket. The present assembly condition ensures there is no stress being induced during assembly as there is no compression of torque rod bracket.
[0027] It should be noted that the description and figures merely illustrate the principles of the present subject matter. It should be appreciated by those skilled in the art that conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present subject matter. It should also be appreciated by those skilled in the art that by devising various arrangements that, although not explicitly described or shown herein, embody the principles of the present subject matter and are included within its spirit and scope. Furthermore, all examples recited herein are principally intended to be expressive for pedagogical purposes to aid the reader in understanding the principles of the present subject matter and the concepts contributed by the inventor(s), and are to be construed as being without limitation to such specifically recited examples and conditions. The novel features which are believed to be characteristic of the present subject matter, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures.
[0028] 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 principles of the present subject matter and are included within its scope.
[0029] Fig. 4 illustrates assembly of the torque rod and torque rod bracket structure, in accordance with an embodiment of the present subject matter. The present torque rod assembly 400 has a torque rod 400a and torque rod bracket 404. The torque rod 400a has big rubber bush 414 at one end to mount the torque rod 400a on the vehicle body or vehicle chassis. The other end of the torque rod 400a has a ‘U’ shaped bracket 406 which is attached to a linkage rod 402 of the torque rod 400a. The big rubber bush 414 is mounted in perpendicular direction from the U shape bracket 406 on the vehicle chassis. The linkage rod 402 is metal rod. Further, the torque rod 400a can be assembled by welding and bolting processes.
[0030] Fig. 4b illustrates the structure of U shape bracket of the torque rod structure, in accordance with the present subject matter. The U shape bracket 406 has bilateral flanges 406a and 406b extending from the base 406c of the U shape bracket 406. The bilateral flanges 406a and 406b are bent outwardly in perpendicular direction from the flanges 406aa and 406bb. The bent flanges 406aa and 406bb have holes for clamping bolt 410 during assembly of torque rod 400a with the torque rod bracket 404.
[0031] The torque rod bracket 404 is attached to the transmission bracket of the vehicle from one side with bolts, and other end has a rubber bush with an inner tube flattened at ends. Where the cylindrical rubber bush (408) that has an inner tube (412) which is used for fastening the Torque rod structure (400a) with the torque rod bracket structure (404). The inner tube 412 has flattened ends 412a and 412b. The flattened ends 412a, 412b of the inner tube 412 have holes for clamping bolt 410 during assembly of torque rod 400a with the torque rod bracket 404. The bent flanges 406aa and 406bb of the U shape bracket 406 of the torque rod 400a match with the flattened ends 412a and 412b of the inner tube of the torque rod bracket 404. Two bolts 410 fasten the bent flanges and flattened ends of the clamp together. Where the other end of the screws is tightened with nuts. In the present assembly, the torque rod 400a is mounted with the torque rod bracket 404 in same direction with the bolts and during assembly any tolerance gap is absorbed by rubber bush element 414a of big bush 414 and it results removal of initial stress in the torque rod bracket structure during assembly.
[0032] The present torque rod structure 400 removes the initial stress generated in the torque rod bracket during assembly the of the torque rod on the bracket. Previously, torque rod bracket induced stress within its structure on compression because of assembly tolerances. In the present assembly, the torque rod bracket is not compressed to mount the torque rod therefore; there is no initial stress in the structure during assembly.
[0033] Although embodiments for the present subject matter have been described in language specific to structural features, it is to be understood that the present subject matter is not necessarily limited to the specific features described. Rather, the specific features and methods are disclosed as embodiments for the present subject matter. Numerous modifications and adaptations of the system/component of the present invention will be apparent to those skilled in the art, and thus it is intended by the appended claims to cover all such modifications and adaptations which fall within the scope of the present subject matter.

Claims:We claim:
1.A torque rod structure (400a) for eliminating initial stress in torque rod bracket (404), the torque rod structure (400a) comprising:
a big bush (414) at one end;
a ‘U’ shaped bracket (406) at other end; and
a linkage rod (402) connects the big bush (414) and the U shape bracket (406).
2.The torque rod structure (400a) as claimed in claim 1, wherein the ‘U’ shaped bracket (406) comprises:
a base (406c);
a pair flanges (406a, 406b) extends in vertical direction from the base (406c), wherein the pair of flanges (406a, 406b) bend and extend outwardly in perpendicular direction from the pair of flanges (406a, 406b).
3.The torque rod structure (400a) as claimed in claim 1, wherein the bent pair of flanges (406aa, 406bb) have holes for clamping by bolts (410).
4.The torque rod structure (400a) as claimed in claim 1, wherein the big bush (414) has rubber element to damp vibrations.
5.A torque rod bracket structure (404) for removing initial stress from transmission bracket, torque rod bracket structure (404) comprises
a cylindrical rubber bush (408) that has an inner tube (412) which is used for fastening the Torque rod structure (400a) with the torque rod bracket structure (404).
6.The torque rod bracket structure (404) as claimed in claim 5, wherein the inner tube (412) has flattened ends (412a, 412b) with holes for clamping by bolts (410).

7. The torque rod bracket structure (404) as claimed in claim 5, wherein the inner tube (412) has rubber bushes to damp vibrations generated by the transmission bracket.

8.A torque rod assembly (400) for mounting engine body on vehicle body to remove initial stress generated in torque rod bracket comprises:
a torque rod (400a) with U shaped bracket (406) at one end; and
a torque rod bracket (404) with cylindrical rubber bush (408) having inner tube (412) with flattened end (412a, 412b) to be mounted with the torque rod (400a).
9.The torque rod assembly (400) as claimed in claim 1, wherein the U shaped bracket (406) is connected with big bush (414) through a linkage rod (402).