JPH0545870Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a support device with a mass damper used, for example, when an exhaust pipe is suspended and supported on a vehicle body.

[Prior art] As a prior art related to the present invention,
Publication No. 186574 is known. Figures 6 and 7
The figure shows the vibration isolator disclosed in this publication. In the figure, 1 indicates a vibration isolating rubber, including left and right support rubbers 1a, 1b and upper and lower combined parts 1 of the vibration isolating rubber 1.
e and 1f are formed into substantially rectangular frame shapes. A round bar weight 2 is arranged between the left and right support rubbers 1a and 1b, and this round bar weight 2 is attached to the left and right support rubbers 1a and 1.
It is wrapped in a holding rubber part 1c that connects the parts b. In such a vibration isolating device, the entire vibration transmission path of the vibration isolating rubber 1 is subjected to the action of a weight, and vibrations of a supported body (an exhaust pipe of an automobile or an exhaust system of a muffler) are absorbed.

[Problems to be solved by the invention] Automobiles are required to have as much interior space as possible without lowering the minimum ground clearance. As one example, in the support device with a mass damper as shown in FIGS. 9 and 10, the distance E between the body side bracket 4 and the exhaust pipe side bracket 5 inserted into each hole 6 of the support rubber 3 is Keep it as short as possible,
Furthermore, the shape of the shoulder portion 3a of the support rubber 3 is required to be such that it does not protrude outward as much as possible. When the shoulder portion 3a extends outward, the support rubber 3
If it is placed diagonally, it will be disadvantageous in terms of space.

Furthermore, in order to improve the durability of the support rubber 3, the elongation rate of the outer and inner sides of the arm portion 3b to be bonded to the damper mass 7 must be approximately the same. In other words, as shown in FIG.
When the overhang of the arm 3b is suppressed, the difference between the outer length l ₂ and the inner length l ₁ of the arm portion 3b increases, and the inner elongation rate is significantly larger than the outer elongation rate when starting suddenly or driving on a rough road. I become confused. Therefore, in the vibration isolating device of the above-mentioned publication, a problem arises in that cracks 8 tend to form inside the base of the arm portion 1g, as shown in FIG. This phenomenon occurs because as the support rubber becomes more compact, the difference in length between the inside and outside of the arm becomes relatively larger, and the durability of the support rubber decreases. In addition, in FIG. 11, the thickness d of the arm portion 3b
The difference in elongation rate can be reduced by making it thinner, but there are restrictions on the strength, so it cannot be made much smaller.

The purpose of the present invention is to provide a support device with a mass damper that can increase the interior space of the vehicle without sacrificing the minimum ground height of the vehicle and improve the durability of the support member (support rubber). do.

[Means for Solving the Problems] A support device with a mass damper that achieves this objective has a first support member and a second support member arranged facing each other, and a support member side attached to the first support member. A hole is provided in the second support member through which the bracket is inserted, a hole is provided in the second support member through which the bracket on the supported material side is inserted, and between each hole in the first support member and the second support member, In a support device with a mass damper, in which a damper mass is positioned to be bonded to an arm made of an elastic body of each support member extending in an arc shape symmetrically with respect to each hole, both ends of the damper mass are connected to the arms of the both ends. It is formed into a substantially fan shape so that the adhesive surface with the arm is substantially perpendicular to the direction of the tensile load acting on the arm.

[Function] In the support device with a mass damper configured as described above, both ends of the damper mass are formed in a substantially fan shape, so that the bonding surface between the damper mass and the arm portion is fixed in the direction of the tensile load acting on the arm portion. The angle is almost right, the lengths of the inside and outside of the arm are almost equal, and the elongation rate is almost uniform. Therefore, stress concentration near the bonding surface of the arm portion is eliminated, and the durability of the support member is greatly improved.

In addition, by making both ends of the damper mass fan-shaped,
It becomes possible to concentrate the weight of the damper mass on both ends, and the thickness of the central portion of the damper mass located between the holes through which the brackets are inserted can be made thinner accordingly. In other words, the distance between the brackets can be narrowed by making the damper mass thinner. Therefore, the floor position of the vehicle can be lowered, and the interior space of the vehicle can be increased.

[Embodiment] Next, a preferred embodiment of the support device with a mass damper according to the present invention will be described with reference to the drawings.

1 to 3 show a support device with a mass damper according to an embodiment of the present invention. In the figure, the support device 11 with a mass damper is composed of a first support member 12, a second support member 12' made of rubber as an elastic body, and a damper mass 13 bonded to each of the support members 12, 12'. has been done. The first support member 12 includes
A hole 16 through which the body side bracket 14 is inserted is formed on the axis A passing through the center of the member. A hole 16 is formed in the second support member 12' on an axis A passing through the center of the second support member 12', into which an exhaust pipe side bracket 17 is inserted. The body side bracket 14 is an L-shaped shaft member, one side of which is fixed to the body 10 as a support member, and the support member 12
A retaining portion 14a that bulges outward in the radial direction is formed on the other end that is inserted into the retaining portion 14a. The exhaust pipe side bracket 17 is also an L-shaped shaft member,
One side is fixed to the exhaust pipe 18 as a supported material,
A retaining portion 17a that bulges outward in the radial direction is formed on the other side of the support member 12 that is inserted through the support member 12.

Each hole 1 of each support member 12, 12'
A damper mass 13 extending along an axis B perpendicular to the axis A is located between the two. The damper mass 13 is formed with a thin wall portion 13a that is parallel to the axis B in the vicinity of a portion perpendicular to the axis A, and the wall thickness of both end portions 13b bonded to each support member 12, 12' increases as it goes outward in the radial direction. It is formed roughly in the shape of a fan with a large diameter. Thin wall portion 13 of damper mass 13
A cavity 19 is formed between a and each hole 16. Arm portions 12b are formed in the vicinity of the hole 16 of each support member 12, 12', branching left and right into two arms and extending in an arc toward both ends 13b of the damper mass 13. Each arm 12b
Both ends 1 of the damper mass 13 formed in a substantially fan shape
The adhesive surface 20 with the arm portion 12b is approximately perpendicular to the direction F of the tensile load acting on the arm portion 12b.
As shown in FIG. 3, the width of the damper mass 13 in the direction of the axis C perpendicular to the axes A and B is narrow at the central thin wall portion 13a and wide at both ends 13b bonded to each arm portion 12b. ing.

In this embodiment, the entire surface of the damper mass 13 is covered with rubber, and all the covered surfaces are vulcanized and bonded to the rubber, but the adhesive surface necessary for performance is the arm part where tensile force is applied. 12b and both fan-shaped end portions 13b of the damper mass 13 are bonded surfaces 20, and the other portions may not be bonded surfaces.

Next, the operation of the above support device with a mass damper will be explained.

While the vehicle is running, the exhaust pipe 18 vibrates due to the impact transmitted from the wheels to the body, and the arm portion 12b of the support member 12 accordingly expands and contracts in the vertical direction (in the direction of arrow G) as shown in FIG. be done. Since the arm portion 12b is vulcanized and bonded to both ends 13 of the fan-shaped damper mass 13 as shown in FIG. 4, the difference between the outer length l ₄ and the inner length l ₃ of the arm portion 12b is is smaller than the conventional structure shown in FIG. 11 described above. In other words, since the damper mass 13 becomes thicker as it goes outward in the radial direction, the outer length _l4 of the arm portion 12b can be shortened accordingly. Therefore, it is possible to make the elongation rates on the outside and inside of the arm portion 12b almost equal, eliminating stress concentration on the inside of the arm unlike in the conventional structure, and preventing cracks from occurring from the inside of the arm portion 12b. .

Further, since both ends of the damper mass 13 are formed into a fan shape, the weight of the damper mass 13 is concentrated at both ends, the moment of inertia in the directions of the axes A and C becomes large, and the natural frequency of the support device becomes small. Therefore, the resonance frequency can be dispersed, and the adverse effects of vibration can be suppressed. Furthermore, since the wall thickness of the central portion of the damper mass 13 can be made thinner, it is possible to shorten the distance D between the body side bracket 14 and the exhaust pipe bracket 15, and the thickness of the damper mass 13 can be reduced by the amount that the damper mass 13 is thinner. The floor position of the vehicle can be lowered, expanding the interior space of the vehicle.

[Effects of the invention] According to the support device with a mass damper of the invention,
Since both ends of the damper mass are formed into a substantially fan shape so that the bonding surfaces with the arms at both ends are approximately perpendicular to the direction of the tensile load acting on the arms, the elongation rate on the outside and inside of the arms is approximately the same. It becomes uniform, and stress concentration on the inside of the arm is eliminated. Therefore, the occurrence of cracks in the arm portions is prevented, and the durability of the support member can be greatly improved.

In addition, since both ends of the damper mass are formed into a substantially fan shape, it is possible to reduce the thickness of the central part of the damper mass located between the holes through which each bracket is inserted, and the distance between each bracket can be shortened. can. Therefore, the floor position of the vehicle can be lowered, and the interior space of the vehicle can be increased.

[Brief explanation of the drawing]

Fig. 1 is a front view of a support device with a mass damper according to an embodiment of the present invention, and Fig. 2 is a -
A sectional view taken along the line, Figure 3 is a plan view of Figure 1, Figure 4
The figure is an enlarged schematic view of the vicinity of the arm in the stationary state of the device shown in FIG. 1, FIG. 5 is a schematic diagram showing the device shown in FIG. 4 with the arm extended, and FIG.
7 is a side view of the vibration isolating device disclosed in Publication No. 186574, FIG. 7 is a side view of FIG. 6, and FIG. 8 is a front view of the device of FIG. 6 in which a crack occurs in the vibration isolating rubber. FIG. 9 is a front view showing an example of a conventional support rubber with a mass damper, FIG. 10 is a side view of FIG. 9, and FIG. 11 is a partially enlarged front view of FIG. 9. 11...Support device with mass damper, 12...
First support member, 12'... Second support member, 12b... Arm portion, 13... Damper mass, 1
3b...Both ends, 14...Body side bracket,
15... Exhaust pipe side bracket, 16... Hole, 20
...Adhesive surface.

Claims (1)

[Scope of utility model registration request] A first support member and a second support member are arranged to face each other, a hole is provided in the first support member through which a bracket on the support member side is inserted, and a hole is provided in the first support member through which the bracket on the support member side is inserted;
A hole is provided in the support member through which the bracket on the side of the supported material is inserted, and the first support member and the second support member are connected to each other.
In a support device with a mass damper, a damper mass is positioned between each hole of a support member, and is bonded to an arm made of an elastic body of each support member that extends in an arc shape symmetrically with respect to each hole. 1. A support device with a mass damper, characterized in that the support device is formed into a substantially fan-like shape such that the bonding surfaces of the end portions with the arm portions are substantially perpendicular to the direction of the tensile load acting on the arm portion.