JP2008169865A - Torque rod - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a torque rod 1 comprising an engine side mounting portion 4 at one end of a rod portion 2 and a vehicle body side mounting portion 8 at the other end, having improved vibration absorbing performance irrespective of whether a change in the posture of an engine is big or small while avoiding the wrenching of the rod portion 2. <P>SOLUTION: In the engine side mounting portion 4, a relatively low resilience elastic body 7 is provided between an outer cylinder 5 and an inner cylinder 6. In the rod portion 2, a relatively high resilience elastic body 3 is provided partially in the longitudinal direction. The rod portion 2 has an engine side rod 2a connected to the engine side mounting portion 4 and a vehicle body side rod 2b connected to the vehicle body side mounting portion 8 both of which are coaxially arranged, and the elastic body 3 mounted between both the rods 2a, 2b. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a torque rod used as an anti-vibration device for an engine in a vehicle such as an automobile.

Conventionally, as shown in FIG. 5, a torque rod 51 is known in which an engine side mounting portion 53 is provided at one end portion of a rod portion 52 and a vehicle body side mounting portion 57 is provided at the other end portion. As shown, the torque rod 51 is used as a mount system that converts the roll direction vibration W ₁ of the engine 61 into vibration W ₂ in the vehicle longitudinal direction by the torque rod 51 and transmits it to the body 62 side. The engine-side attachment portion 53 has a bush structure in which an elastic body 56 is interposed between the outer cylinder 54 and the inner cylinder 55, and the vehicle body-side attachment portion 57 also has an elastic body 60 interposed between the outer cylinder 58 and the inner cylinder 59. The rod portion 52 is composed of one long rigid bar.

  However, in the above-described conventional torque rod 51, if an elastic body 56 of the engine-side mounting portion 53 having a low spring constant is used, vibration occurs when the attitude of the engine 61 is large (when low-frequency large-amplitude vibration is input). When the elastic body 56 having a high spring constant is used, an idle state (at the time of inputting high-frequency small-amplitude vibration) occurs. There is a problem that the vibration at the end gets worse.

Further, in the above-described prior art, with respect to vertical and horizontal vibrations other than the roll direction of the engine 61, a large load acts on the vehicle body side mounting portion 57 due to the rod portion 52 being twisted. In this regard, by using the elastic body 60 of the vehicle body side mounting portion 57 having a low spring constant, the twist of the rod portion 52 can be eliminated, but the amplitude increases when the posture change of the engine 61 is large, It takes time to converge the vibration.
JP-A-8-74933

The applicant of the present application has previously proposed the torque rods disclosed in the following Patent Documents 2 to 3, but these prior arts have a relatively complicated mechanism (the torque disclosed in Patent Document 2). In the rod, a link mechanism and a third bush are provided between the engine side mounting portion (first bush) and the vehicle body side mounting portion (second bush). (The third bush is also provided between the vehicle body side (first bush) and the vehicle body side mounting portion (second bush)), which differs from the present invention in that the direction of twisting is limited. It has become.
JP 2006-144900 A JP 2006-2908 A

  In view of the above points, the present invention provides a torque rod that can exhibit excellent vibration isolation performance regardless of whether the engine attitude change is large or small, and can eliminate the twisting of the rod portion. The purpose is to do.

  In order to achieve the above object, a torque rod according to claim 1 of the present invention is the torque rod provided with the engine side mounting portion at one end portion of the rod portion and the vehicle body side mounting portion at the other end portion. The engine-side mounting portion has a relatively low spring elastic body between the outer cylinder and the inner cylinder, and the rod portion has a relatively high spring elastic body in a part in the longitudinal direction. Is.

  The torque rod according to claim 2 of the present invention is the torque rod according to claim 1, wherein the rod portion includes an engine side rod coupled to the engine side mounting portion and a vehicle body coupled to the vehicle body side mounting portion. A side rod is coaxially arranged, and an elastic body is interposed between the rods.

  In the torque rod of the present invention having the above-described configuration, when the change in the attitude of the engine in an idle state or the like is small, the longitudinal vibration transmission to the vehicle body is suppressed by the relatively low spring elastic body provided in the engine side mounting portion. . When there is a large change in the attitude of the engine, such as sudden start or sudden braking, the relatively low spring elastic body provided in the engine side mounting portion is crushed, and then the relatively high spring elastic body provided in the rod portion causes the engine posture to change. Suppresses rapid changes in the frequency and converges vibrations quickly. Even when the engine vibrates vertically or horizontally, the transmission of vibration is reduced by the elastic body of the relatively high spring provided in the rod part, and the rod part near the vehicle body side mounting part is not twisted. It is possible to reduce the load transmitted to.

  Therefore, according to the torque rod according to the first aspect of the present invention, the relatively low spring elastic body provided in the engine-side mounting portion and the relatively high spring elastic body provided in the rod portion respectively act on the engine. When the posture change is large, it can exhibit excellent vibration isolation performance regardless of whether it is small. In addition, since the rod portion is prevented from being twisted by the relatively high spring elastic body provided in the rod portion, vibration transmission due to the rod portion being twisted can be reduced.

  According to a second aspect of the present invention, the rod portion includes, for example, an engine side rod connected to the engine side mounting portion and a vehicle body side rod connected to the vehicle body side mounting portion on the same axis. An elastic body is interposed between the two, and it is possible to use a single piece of rubber as the elastic body. Therefore, since it is not necessary to provide the third bush as in the prior arts disclosed in Patent Documents 2 to 3, the configuration can be relatively simplified. Furthermore, since the elastic deformation direction is not limited when the elastic body is a single piece of rubber, the direction of twisting that can be suppressed is not limited.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a torque rod 1 according to an embodiment of the present invention, that is, a plan view in which the torque rod 1 is partially cut away.

  The torque rod 1 according to this embodiment is provided with an engine side mounting portion (also referred to as an engine side mounting bush) 4 at one end portion of the rod portion 2 and a vehicle body side mounting portion (also referred to as a vehicle body side mounting bush) at the other end portion. 8), the engine side mounting portion 4 is provided with a relatively low spring elastic body 7 between the outer cylinder 5 and the inner cylinder 6, and the rod portion 2 is relatively A high spring elastic body 3 is provided in a part of the rod portion 2 in the longitudinal direction.

  Further, the torque rod 1 includes an engine side mounting bush (engine side torque) connected to one end (front end) of the rod portion 2 arranged in the front-rear direction of the vehicle body on the engine (FF side-mounted engine) side. (Also referred to as a rod bush) 4, and a vehicle body side mounting bush (also referred to as a vehicle body side torque rod bush) 8 connected to the vehicle body side is provided at the other end (rear end), and the roll direction generated on the engine side The vibration is converted into vibration in the longitudinal direction of the vehicle body to provide an anti-vibration action. Further, the elastic body 3 having a higher spring than the elastic body 7 provided in the engine side mounting bush 4 is provided at an intermediate position in the longitudinal direction of the rod portion 2. Is provided as a part of the rod portion 2.

  The engine-side mounting portion 4 has an annular elasticity between an outer cylinder 5 made of metal or the like rigid material connected to one end of the rod portion 2 and an inner cylinder 6 made of the same metal or the like rigid material connected to the engine side. The elastic body 7 is made of a predetermined rubber-like elastic body, and is vulcanized and bonded to the outer cylinder 5 and the inner cylinder 6, and its spring constant is set to be relatively low.

  The vehicle body side mounting portion 8 is annular between an outer cylinder 9 made of a rigid material such as a metal connected to the other end of the rod portion 2 and an inner cylinder 10 made of a rigid material such as a metal connected to the vehicle body side. An elastic body 11 is interposed, and the elastic body 11 is made of a predetermined rubber-like elastic body, and is bonded to the outer cylinder 9 and the inner cylinder 10, and its spring constant is set to be relatively low.

  The rod part 2 is made of a rigid material such as a metal, which is connected to the outer cylinder 5 of the engine-side mounting part 4, and is also made of a rigid material such as a metal, which is connected to the outer cylinder 9 of the mounting part 8 on the vehicle body side. The vehicle body side rod 2b is coaxially arranged, and a short rod-like elastic body 3 is interposed between the rods 2a and 2b. The elastic body 3 is made of a predetermined rubber-like elastic body, and both rods The spring constants are bonded to the opposing end faces of 2a and 2b, respectively, and their spring constants are set relatively high. Therefore, both the rods 2a, 2b and the elastic body 3 are arranged in series with the elastic body 3 sandwiched between them, are arranged coaxially, and form an elongated rod body in appearance.

  The elastic body 3 is a cylindrical solid body, but may be a cylindrical body having a cavity inside. Moreover, although the cross section of the elastic body 3 in the direction perpendicular to the longitudinal direction has the same or similar shape as the cross sections of the rods 2a and 2b, it does not necessarily have to be the same or similar shape. In addition, the elastic body 3 is provided at an intermediate position in the longitudinal direction of the rod portion 2, but may be provided at an end portion in the longitudinal direction of the rod portion 2.

  In the torque rod 1 having the above-described configuration, when the change in the attitude of the engine such as an idle state is small (when high-frequency small-amplitude vibration is input), the relatively low spring elastic body 7 provided in the engine-side mounting portion 4 is used. This suppresses transmission of vibrations in the longitudinal direction to the vehicle body. When the change in the attitude of the engine such as sudden start or sudden braking is large (when inputting low-frequency large-amplitude vibration), as shown in part C of FIG. After the low-spring elastic body 7 is crushed, the relatively high-spring elastic body 3 provided in the rod portion 2 suppresses a rapid change in the engine posture and converges the vibration quickly.

Further, as shown in FIG. 3, when the vibration W ₄ of vibration W ₃ and the lateral direction of the vehicle body in the vertical direction of the vehicle body to the engine 21 occurs, the elastic member 3 relatively high spring provided in the rod portion 2 is elastically By deforming and exhibiting an anti-vibration action, transmission of vibration is reduced. In this case, according to the prior art, as shown in the comparison diagram of FIG. 4A, the rod portion 52 is twisted near the vehicle body side mounting portion 57 (D portion in the figure), so that When a large load was applied, according to the embodiment of the present invention, the elastic body 3 is bent and deformed as shown in FIG. Load to be reduced.

  Therefore, as described above, according to the torque rod 1 of the embodiment of the present invention, the relatively low spring elastic body 7 provided in the engine side mounting portion 4 and the relatively high spring elastic body 3 provided in the rod portion 2. With each function, excellent vibration-proof performance can be exhibited regardless of whether the change in the attitude of the engine is large or small. Further, since the rod portion 2 is restrained from being twisted by the relatively high spring elastic body 3 provided in the rod portion 2, it is possible to reduce the vibration and load transmission associated with the rod portion 2 being twisted. it can.

  Further, the rod part 2 is coaxially arranged with the engine side rod 2a connected to the outer cylinder 5 of the engine side attachment part 4 and the vehicle body side rod 2b connected to the outer cylinder 9 of the vehicle body side attachment part 8. Since the rod-like elastic body 3 is interposed between the rods 2a and 2b, the rod portion 2 is compared with the prior art described in Patent Documents 2 to 3, and the configuration is simplified. Has been. Furthermore, since the elastic body 3 is a rubber single body and its elastic deformation direction is not limited, there is also a technical effect that the direction of twisting that can be suppressed is not limited.

FIG. 2 is a partially cutaway plan view of a torque rod according to an embodiment of the present invention. Explanatory drawing showing the operating state of the torque rod Explanatory drawing showing the vibration generation state in the engine (A) is explanatory drawing which shows the operating state of the torque rod which concerns on a comparative example, (B) is explanatory drawing which shows the operating state of the torque rod which concerns on the Example of this invention. A partially cutaway plan view of a torque rod according to a conventional example Explanatory drawing showing the vibration generation state in the engine

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Torque rod 2 Rod part 2a Engine side rod 2b Car body side rod 3,7,11 Elastic body 4 Engine side attaching part 5,9 Outer cylinder 6,10 Inner cylinder 8 Car body side attaching part 21 Engine

Claims (2)

In the torque rod (1) in which the engine side mounting portion (4) is provided at one end of the rod portion (2) and the vehicle body side mounting portion (8) is provided at the other end,
The engine side mounting portion (4) has a relatively low spring elastic body (7) between the outer cylinder (5) and the inner cylinder (6),
The rod part (2) has an elastic body (3) having a relatively high spring in a part in the longitudinal direction. The torque rod according to claim 1,
The rod portion (2) has an engine side rod (2a) connected to the engine side mounting portion (4) and a vehicle body side rod (2b) connected to the vehicle body side mounting portion (8) arranged coaxially. A torque rod comprising an elastic body (3) interposed between the rods (2a) and (2b).

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