JPH0355777Y2 - - Google Patents

Description

[Detailed description of the invention] (Technical field) The present invention relates to a support device with a mass damper.
In particular, the present invention relates to a support device with a mass damper for suspending and supporting an automobile exhaust pipe or the like to block or buffer vibrations transmitted to the vehicle body.

(Prior art and its problems) Various structures have been adopted in the past in which vibration system members are suspended and supported by ring-shaped rubber support devices to isolate or buffer vibrations. For example, in the body structure of an automobile, when an exhaust pipe that guides exhaust gas from the engine is suspended and supported on the car body, a ring-shaped structure is used to prevent engine vibrations from being transmitted from the exhaust pipe to the car body. A structure is adopted in which the upper and lower parts of a support device made of a rubber elastic body exhibiting the above characteristics are respectively connected to the vehicle body and the exhaust pipe.

By the way, in such a support device as a vibration isolator, if the exhaust pipe has a resonance point in the normal rotation range of the engine, and the support device is composed only of a rubber elastic body, the rubber elastic body Because the elastic properties alone cannot prevent the transmission of vibrations to the vehicle body, as disclosed in Japanese Utility Model Application Publication No. 59-186574, etc., they are arranged vertically to face each other so as to have a ring shape as a whole. Ru, U
A dynamic damper having an integrated structure in which a single rod-shaped mass is interposed horizontally between the open ends of two rubber elastic bodies in the shape of a letter, and is joined to the rubber elastic bodies. A structure has been proposed that uses a mass damper type support device to suppress transmission of vibrations over a wide frequency range when absorbing vibrations from an exhaust pipe to a vehicle body.

However, in the case of a support device in which a single mass is interposed horizontally across a ring-shaped rubber elastic body (combined body) as described above, when a tensile load is applied, the horizontal direction of the rubber elastic body Displacement is regulated and the spring constant in the vertical direction is increased,
There was a problem in that it increased the transmission of vibration from the exhaust pipe to the vehicle body, worsening the vibration noise of the vehicle body, and there was also the inherent problem that the durability of the rubber elastic body decreased due to stress concentration. .

(Purpose of the invention) The present invention has been developed against the background of the above, and its purpose is to improve the relationship between the left and right sides of rubber elastic bodies in a support device that suspends and supports vibration system members. It is an object of the present invention to provide a support device with a mass damper that can advantageously suppress vibration transmission from the vibration system member to its mounting member, particularly from the exhaust pipe to the vehicle body, without restricting displacement in the direction.

(Structure of the invention) In order to achieve the above object, in the present invention, first and second members are respectively attached to mutually symmetrical parts of a support member made of a ring-shaped rubber elastic body. In this support device, a damper mass is provided independently from each other at approximately the center of the left and right arm portions of the support member that connects the first and second mounting portions. A support device with a mass damper is provided, characterized in that the support device is integrally attached and each damper mass is configured to have a trapezoidal or triangular shape tapering toward the approximate center of the ring shape of the support member. This is a summary.

(Examples) Hereinafter, in order to clarify the present invention more specifically, examples of the present invention will be described in detail based on the drawings.

First, in FIG. 1, according to an embodiment of the present invention,
A vertical cross-sectional view of a support device 10 with a mass damper as an exhaust pipe support device in an automobile is shown, in which 12 is a support member made of a rubber elastic body having a predetermined thickness and having a substantially circular ring shape. Then, the left and right arm portions 18a, 18b
It is composed of

The support member 12 is provided with first and second mounting portions 28a and 28b that project inward, respectively, and are vertically symmetrically located. Further, the mounting portions 28a, 28b have first and second mounting holes 14a, 1, respectively.
4b is formed, and as is clear from FIGS. 3 and 4, a first bracket (mounting member) 22 provided on the body of the automobile is inserted into the first mounting hole 14a. A second bracket (mounting member) 24 for holding the exhaust pipe is installed in the second mounting hole 14b.
are inserted into each other to connect the vehicle body and the exhaust pipe. Although not shown, the second bracket 24 has a similar configuration to the lower part of the first bracket, and is adapted to hold the exhaust pipe by a bent portion of the lower part.

The support member 12 also has first and second mounting portions 28a and 2 located above and below the support member 12.
The left and right arm parts 18a and 18b are composed of symmetrical arm parts 18a and 18b so as to connect the left and right arm parts 18a and 18b, and at approximately the center of each of the left and right arm parts 18a and 18b, there is a metal of approximately the same predetermined weight. The damper masses 20, 20 made of the same material are separately arranged. Note that each of the damper masses 20, 20 is entirely covered with a rubber elastic body forming the support member 12, and has an integral structure with the support member 12.

As is clear from FIGS. 2a to 2c, each damper mass 20 has a substantially trapezoidal shape, and the upper base of the trapezoidal shape is on the inside, in other words, the support member The arm portions 18a, 18b are positioned at the center of each arm portion 18a, 18b so as to taper toward the center of the arm portion 12. Of course, the shape of the damper mass 20 is not limited to the illustrated trapezoidal shape, but if it can be tapered and have sloped surfaces on both sides,
Even if it is triangular, there is no problem.

Further, in this damper mass 20, the upper and lower portions of the left and right arm portions 18a, 18b are respectively connected to the upper and lower inclined surfaces 20a, 20b by vulcanization adhesive, but the trapezoidal shape of the damper mass 20 That is, as the thickness of the damper mass 20 becomes thicker toward the outside in the radial direction of the support member 12, the arm portion 18
a, 18b are mounted in a direction close to perpendicular to the inclined surfaces 20a, 20b, and in particular, they are configured to provide an angle that is substantially perpendicular to the inclined surfaces 20a, 20b.

Therefore, the support device 10 having such a structure has a dynamic damper structure composed of the damper masses 20, 20 and the support member 12 as a rubber elastic body, so that the support device 10 has a 300 Hz frequency similar to the conventional one.
In addition to making it possible to effectively reduce the engine transmitted sound, since the damper masses 20, 20 are provided independently on the left and right arm portions 18a, 18b, fluctuations in the exhaust pipe and the vehicle body can be avoided. Even if a tensile load is applied to the ring-shaped support member 12, there is no part that restricts its displacement.
In combination with the function of a dynamic damper, the transmission of vibrations to the vehicle body can be effectively suppressed without increasing the spring constant of the damper.

In addition, as in the above example, since the damper masses 20, 20 are divided and arranged independently, it is difficult to generate rotational force around one mounting portion 14a, and lateral movement. becomes smaller, thereby causing the support member 12 to
In particular, in the first mounting portion 28a located above, the first mounting member (bracket) 22 attached thereto allows the first mounting portion 28a to be
Therefore, wear of the first mounting hole 14a provided in the first mounting hole 14a can be effectively prevented.

Furthermore, by dividing the damper mass 20 and having the inclined surface of each damper mass 20 at a predetermined angle, the arm portions 18a, 18
The difference between the lengths of the outer circumference and the inner circumference of b becomes smaller (in this example, the inclination angles are set so that they are approximately equal), and as a result, the difference in length between the outer circumference and the inner circumference of Since the difference in the elongation rate between the inside and outside of the arm section becomes smaller (in this case, it becomes approximately equal), the concentration of stress in the rubber elastic body near the bonding surface with the damper mass in the arm section is advantageously alleviated or eliminated. As a result, the durability of the support member made of the rubber elastic body is significantly improved.

Moreover, the first and second mounting portions 28a, 2
8b has a rectangular shape that protrudes toward the center of the support member 12, and is formed facing each other with a predetermined distance apart, so that it is formed by a conventional single mass. By interposing a mass like a support member between the first and second mounting parts that face each other, the space between the mounting parts is not partitioned into two, thereby preventing the first and second mounting parts from being partitioned into two. The distance between the second mounting portions 28a and 28b can be reduced, thereby making it possible to reduce the movement of the support member 12 in the vertical direction, that is, in the rebound direction.

The embodiments of the present invention have been shown above, but the present invention
The present invention is by no means limited to these illustrative embodiments, and various changes, modifications, improvements, etc. can be made based on the knowledge of those skilled in the art without departing from the spirit of the present invention. It goes without saying that the present invention includes such embodiments.

For example, FIG. 5 shows another embodiment of a support device according to the invention, in which the support device 30, like the embodiments described above, includes:
It is composed of a support member 32 made of a ring-shaped rubber elastic body having left and right arm parts 38a and 38b, and a first bracket for connecting the vehicle body and the exhaust pipe to each other is attached to upper and lower symmetrical parts of the support member 32. and second mounting portions 28a, 28
b is formed.

In this embodiment, the metal damper masses provided approximately at the center of each of the left and right arm portions 38a, 38b are sized asymmetrically. In short, in the damper masses 34 and 36, one damper mass 36 is formed to have a larger shape than the other damper mass 34, and therefore,
When absorbing vibrations transmitted from the exhaust pipe to the vehicle body, the left and right damper masses resonate at different frequencies. That is, as shown in the graph of FIG. 6, when using the left-right asymmetrical damper mass in this embodiment, the resonance points are dispersed, so that the adverse effects of mass resonance peculiar to support members with mass can be advantageously avoided. It can be reduced.

In each of the above embodiments, an example is shown in which the present invention is applied to a device for suspending and supporting an automobile exhaust pipe, a so-called muffler support rubber. In addition, it should be understood that the present invention can be applied to any support device with a mass damper that uses a support member made of a ring-shaped rubber elastic body.

(Effects of the invention) As explained above in detail, in the present invention, the left and right arms of the support member have
Because each damper mass is provided independently, the displacement of the rubber elastic body in the left and right direction is not restricted when a tensile load is applied, and as a result, the rubber elastic body can be freely displaced in any direction. Therefore, it is possible to effectively reduce the transmission of vibrations to the vehicle without increasing the spring constant.

Furthermore, in the present invention, the damper mass provided approximately at the center of the left and right arm portions is
The support member has a trapezoidal shape that tapers toward the center, which reduces the difference between the outer length and the inner length of the arm.
Particularly preferably, the upper and lower inclined surfaces of the damper mass are formed to be substantially perpendicular to the arms to which they are connected, and the inner and outer lengths of the arm parts are approximately equal. As a result, the difference in the elongation rate between the outer and inner circumferential parts of the left and right arm parts becomes smaller with respect to the tensile load acting on the arm part, and the inward elongation of the arm part near the bonding surface with the damper mass becomes smaller. Stress concentration is eliminated, and cracks are effectively prevented from occurring in the outer portion of the bonding surface of the arm portion with the damper mass, and the durability of the arm portion can be advantageously improved.

Furthermore, since the damper mass according to the present invention has a smaller shape than one using a single mass, it can be manufactured easily and costs can be reduced.

Furthermore, in the support device according to the present invention, the damper mass is divided and provided on the left and right arm sections, respectively, so the space between the first and second mounting sections is partitioned into two masses. Between
It is sufficient to have only one intervening part without forming any part. This makes it possible to reduce the distance between the upper and lower attachment parts, thereby making it possible to reduce movement in the rebound direction.

[Brief explanation of drawings]

FIG. 1 is an explanatory longitudinal cross-sectional view showing one embodiment of the support device according to the present invention, and FIGS. 2 a to 2 c are
FIG. 3 shows a front view, a side view, and a plan view of the damper mass used in the embodiment shown in FIG. 1, and FIG. FIG. 4 is a cross-sectional explanatory view of the main part showing a state in which the vehicle body and the exhaust pipe are connected through the main part, FIG. 4 is a cross-sectional side view of the main part in FIG. 3, and FIG. FIG. 6 is a longitudinal cross-sectional explanatory view showing the support device according to the embodiment, and FIG. 6 is a graph for explaining the resonance points of the support devices according to the present invention shown in FIGS. 1 and 5. FIG. 10,30...Support device, 12,32...
Support member, 14a...first mounting hole, 14b
... Second mounting hole, 18a, 18b ... Left and right arm parts, 20, 34, 36 ... Damper mass, 20
a, 20b... Inclined surface, 22, 24... Bracket, 26... Interval, 28a... First mounting portion, 2
8b...second attachment part, 38a, 38b...left and right arm parts.

Claims (1)

[Claims for Utility Model Registration] A support comprising a support member made of a ring-shaped rubber elastic body and provided with first and second attachment parts to which first and second members are attached, respectively, at mutually symmetrical parts. In the device, damper masses are integrally attached to the left and right arms of the support member that connects the first and second attachment portions, respectively, independently of each other, and each damper mass is attached to the support member. 1. A support device with a mass damper, characterized in that the support device has a trapezoidal or triangular shape that tapers toward the approximate center of the ring shape.