JPS6234040Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vibration isolating rubber device, and is particularly applicable to an engine mount that elastically supports an engine from the vehicle body and prevents engine vibrations from being transmitted to the vehicle body. Related to anti-vibration rubber equipment for vibration damping.

Two frames and a mass member are spaced apart from each other and arranged in a layered manner, the mass member being between the two frames, and between one of the frames and the mass member, and between the mass member and the mass member. Various anti-vibration rubber devices have already been proposed in which rubber-like elastic bodies are provided between the frame bodies and the other frame bodies to connect them.

In the case of the above-mentioned vibration isolating rubber device, in addition to the vibration damping effect due to the internal friction of the rubber-like elastic body, the vibration damping effect is obtained by acting as a mass damper with the mass member as a mass element, and it provides excellent vibration insulation. be effective. However, in this vibration-isolating rubber device, a mass member is provided between the two frames, and this is of a type that divides the rubber-like elastic body between the two frames into two pieces. The ratio of the spring constant in the compression direction and the spring constant in the shear direction of the whole anti-vibration rubber device is larger than that without the above-mentioned mass member, and for this reason it is especially used for engine mounting. In this case, it is difficult to set the two spring constants to the desired values, and when the spring constant in the compression direction is set to the desired value, the spring constant in the shear direction becomes lower than the required value, causing problems such as when starting the engine or decelerating. There is a problem that sometimes the two frames mutually displace greatly in the shearing direction, and the stoppers that limit the displacement of both frames in the shearing direction collide with each other, resulting in interference noise. Additionally, if the resonant frequency in the compression direction of the anti-vibration rubber device is set to approximately 250Hz in order to reduce interior noise around 500Hz, the resonant frequency in the shear direction will be approximately 130Hz, which will cause the engine's second It enters the next vibration range, and therefore the muffled sound inside the car cannot be effectively reduced.

The present invention makes it possible to freely adjust the ratio of the spring constant in the compression direction and the spring constant in the shear direction in the vibration isolating rubber device as described above, thereby setting the two spring constants to desired values. It is an object of the present invention to provide an improved vibration isolating rubber device that can be set to 1 and can effectively damp both vibrations in the compression direction and vibrations in the shear direction.

According to the present invention, two frames and a mass member are spaced apart from each other and arranged in a layered manner, and the mass member is located between the two frames, and one of the frames and the mass member are arranged in layers. In a vibration isolating rubber device in which a rubber-like elastic body is provided between a mass member and between the mass member and the other side of the frame to connect them, the rubber-like elastic body is sandwiched. This is achieved by a vibration isolating rubber device characterized in that one wall surface of the mass member and the frame body that face each other includes wall surface portions that face each other in a direction inclined with respect to the through-layer direction. .

According to the above configuration, by selecting the inclination angle of the wall surface portion, the ratio of the spring constant in the compression direction and the spring constant in the shear direction of the vibration isolating rubber device can be freely adjusted, thereby reducing the mass required as a mass damper. Even if a member is provided to divide the rubber-like elastic body between the frames into two, the two spring constants can be set to desired values, and the resonance vibration in the compression direction of the vibration-isolating rubber device can be adjusted accordingly. It becomes possible to set the number and the resonance frequency in the shear direction to desired values. As a result, in a vibration isolating rubber device with a mass member, even if the spring constant in the compression direction is set to the desired value, the spring constant in the shear direction will not fall below the required value, and the spring constant in the shear direction will also be set to the required value. It is possible to prevent the two frames from being significantly displaced relative to each other in the shearing direction when the engine is started or decelerated, and it is possible to avoid the stoppers from colliding with each other. Also,
After setting the resonant frequency in the compression direction of the mass damper of the anti-vibration rubber device to the required value, the resonant frequency in the shear direction can be set to a value greater than the engine's secondary vibration frequency range, thereby reducing muffled noise inside the car. You can.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a longitudinal sectional view showing one embodiment of a vibration-proof rubber device according to the present invention. In the figure, 1 and 2
1 and 3 respectively indicate a frame body and 3 a mass member, which are vertically spaced apart from each other in the figure and arranged in a layered manner. The mass member 3 is located between the frames 1 and 2, and between the mass member 3 and the frame A and between the mass member 3 and the frame 2, rubber-like rubber or rubber-like products are provided. Elastic bodies 4 and 5 are provided.

The rubber-like elastic body 4 is vulcanized and bonded at both ends to the wall surfaces 6 and 7 of the frame 1 and the mass member 3, thereby elastically connecting them to each other. The wall surfaces 6 and 7, which face each other with the rubber-like elastic body 4 in between, are planes perpendicular to the layer penetration direction (vertical direction in the figure).

The rubber-like elastic body 5 is a wall surface 8 of the frame body 2 and the mass member 3.
and 9 are vulcanized and bonded to elastically connect them to each other. The walls 8 and 9, which face each other with the rubber-like elastic body 5 in between, have flat wall portions 8a, 9a perpendicular to the layer penetration direction and inclined wall portions 8b, 9b inclined with respect to the layer penetration direction, respectively. have.
Two inclined wall portions 8b and 9b are provided so as to be inclined in opposite directions. That is, the mass member 3 has a triangular cross section, and both oblique sides thereof are inclined wall portions 9b. The rubber-like elastic body 5 has a cavity 10 in its center, and is divided into left and right parts in the figure. The cavity 10 acts to reduce the spring constant of the vibration isolating rubber device in the compression direction. Also, this cavity 10
is provided to avoid early damage to the rubber-like elastic body in this part when it is filled with the rubber-like elastic body.

The frame body 2 integrally has stopper pieces 11 at both ends thereof. The inner and outer surfaces of the stopper piece 11 are each covered with a rubber-like elastic body 12,
A stopper member 13 faces the end face of the mass member 3 at a predetermined distance on its inner surface, limits the amount of displacement in the shearing direction between the frame 2 and the mass member 3, and is attached to the frame 1 on its outer surface. The frame members 1 and 2 face each other at a predetermined interval to limit the amount of displacement of the frames 1 and 2 in the shearing direction.

Further, the frame body 1 is integrally provided with bolts 14 for attachment.

When vibration (kinetic force) in the compression direction acts on the rubber-like elastic body 4 between the frames 1 and 2, a force in the compression direction is applied, and vibration in the shear direction acts between the frames 1 and 2. Then, a force in the shearing direction acts on the rubber-like elastic body 5, but when vibrations in the compression direction act on the rubber-like elastic body 5 between the frames 1 and 2, forces in the compression direction and the shearing direction act on the rubber-like elastic body 5.
Further, when a force in the shearing direction is applied between the frames 1 and 2, a force in the compression direction and a force in the shearing direction also act. When the vibration in the shearing direction acts between the frames 1 and 2, this acts only on the rubber-like elastic body 4 as a force in the shear direction, as described above, but on the rubber-like elastic body 5, the vibration acts in the shear direction. It acts as a force in the direction and a force in the compression direction, and the ratio of the forces is determined by the inclination angle of the inclined wall portions 8b and 9b with respect to a plane perpendicular to the direction of penetration, and the larger the inclination angle, the more the force acts in the shearing direction. The force decreases and the force acting as a compressive force increases. Therefore, by adjusting the inclination angle of this inclined wall surface portion, the ratio of the spring constant in the compression direction and the spring constant in the shear direction can be adjusted, thereby making it possible to set both spring constants to required values.

2 to 4 each show other embodiments of the vibration isolating rubber device according to the present invention. In FIGS. 2 to 4, parts corresponding to those in FIG. 1 are designated by the same reference numerals as in FIG. 1. In the embodiment shown in FIG. 2, the mass member 3 is constituted by a combination of a flat plate member 3a and a bent plate member 3b formed in a V-shaped cross section.

In the embodiment shown in FIG.
is the flat plate member 3a in the embodiment shown in FIG.
is omitted, and is composed only of the bent plate member 3b.

Further, in the embodiment shown in FIG. 4, the flat wall surface portion 9a of the wall surface 9 of the mass member 3 is omitted, and the entire wall surface portion 9a is constructed as an inclined wall surface 9b. still,
In this embodiment, a flat wall portion 8a remains on the wall surface 8 of the frame body 2, but this wall portion 8a may also be entirely constructed as an inclined wall surface.

Although the present invention has been described in detail with respect to specific embodiments above, the present invention is not limited to the above-mentioned embodiments, and various other embodiments are possible within the scope of the present invention. This will be obvious to those skilled in the art.

[Brief explanation of the drawing]

1, 2, 3, and 4 are longitudinal cross-sectional views showing different embodiments of the vibration isolating rubber device according to the present invention. 1, 2 - frame body, 3 - mass member, 4, 5 - rubber-like elastic body, 6 - 9 - wall surface, 8a, 9a - wall surface part, 8
b, 9b - inclined wall surface part, 10 - hollow part, 11 - stopper piece, 12 - rubber-like elastic body, 13 - stopper member, 14 - bolt.

Claims (1)

[Scope of utility model registration request] Two frames and a mass member are spaced apart from each other and arranged in a layered manner, and the mass member is between the two frames, and between one of the frames and the mass member, and between the mass member and the mass member. In a vibration isolating rubber device in which a rubber-like elastic body is provided between each of the frame bodies to connect them, the mass member and the frame face each other with the rubber-like elastic body in between. 1. A vibration isolating rubber device, wherein one wall surface of the body includes wall portions facing each other in a direction inclined with respect to the through-layer direction.