JP2688850B2 - Liquid mounting device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a liquid-filled mount such as a liquid-filled engine mount used by being interposed between a vehicle body and an engine.

(Prior Art) Conventionally, as the liquid-filled mount device of the above-described example, for example, a main chamber and a sub-chamber in which a liquid such as an antifreeze liquid is filled, and an orifice connecting these chambers are provided, and a low temperature of about 10 to 20 Hz is provided. There are devices configured to obtain damping characteristics in the frequency range.

However, in this conventional device, since it becomes difficult for the liquid to pass through the above-mentioned orifice in the high frequency range of about 200 to 500 Hz, the incompressible liquid is sealed in the main chamber, and the liquid acts as a spring. However, there is a problem that engine vibration is transmitted to the vehicle body.

In order to solve such a problem, conventionally, for example, a liquid damping engine mount device having a decoupler described in Japanese Utility Model Laid-Open No. Sho 62-188640 and a dynamic damper described in Japanese Patent Laid-Open No. 59-151641 are provided. There is also a fluid-filled engine mount.

The former device disclosed in Japanese Utility Model Laid-Open No. Sho 62-188640 is provided with a passage for communicating the main chamber and the sub-chamber separately from the above-mentioned orifice, and a decoupler for controlling opening / closing of this passage in accordance with a frequency band. Provided, in the low frequency range, the above-mentioned passage is closed by the large movement of the decoupler, and the damping characteristic is obtained by the action of the orifice, while in the high-frequency area, the above-mentioned passage is opened by the small movement of the above decoupler,
It is configured to prevent the spring constant from increasing.

The latter engine mount described in Japanese Patent Laid-Open No. 59-151641 has a dynamic damper including a bellows and a mass body (mass) filled with an inert gas (gas) such as N2 gas inside the main chamber. It is mounted to obtain damping characteristics by the action of the above-mentioned orifice in the low frequency range, while it is configured to absorb and attenuate the high frequency vibration by the dynamic damper that acts in the opposite phase to the high frequency vibration of the liquid in the high frequency range. .

However, in any of the above liquid-filled mount devices, the structure thereof has a very complicated problem.

(Object of the Invention) The present invention is capable of attenuating high-frequency vibrations, and of course, a dynamic damper is configured without providing a mass body, so that the structure can be greatly simplified. The purpose is to provide a device.

(Structure of the Invention) The present invention is a liquid-filled mount device having a main chamber and a sub-chamber in which a liquid is sealed, and an orifice that connects the two chambers, and a dynamic damper provided in the main chamber, The dynamic damper is composed of a cylindrical outer cylinder, a cylindrical bellows provided in the outer cylinder at a predetermined distance from the inner wall of the outer cylinder, and a gas enclosed in the bellows. The liquid-filled mounting device is characterized in that the tip is located inward of the tip of the outer cylinder.

(Effect of the Invention) According to the present invention, while the damping characteristics can be obtained by the action of the orifice described above in the low frequency region,
In the high frequency range, when the liquid flows through a relatively narrow space between the bellows and the outer cylinder, the liquid exerts a fluid viscosity due to the fluid resistance, and a damping action necessary for the dynamic damper is generated, and the bellows is a spring, The liquid in the portion surrounded by the free end side of the bellows and the outer cylinder serves as a dynamic damper that functions as a mass that reciprocates in one direction, and high-frequency vibration can be significantly damped by the vibration of this dynamic damper.

As a result, a good low spring constant can be obtained, and since the dynamic damper can be configured without providing a mass body unlike the conventional device, the structure can be greatly simplified. .

Embodiment An embodiment of the present invention will be described below in detail with reference to the drawings.

The drawing shows a liquid-filled mount device, and in FIG. 1, a rubber 3 as a vibration-proof base is interposed between an insulator inner cylinder 1 and an insulator outer cylinder 2, while the insulator outer cylinder 2 has a lower body. The side member 4 is attached, and the lower end of the rubber 3, the partition wall 5, and the member 6 are sandwiched between the lower body side member 4 and the upper insulator outer cylinder 2.

A main chamber 7 is formed between the rubber 3 and the upper part of the partition wall 5, and a sub chamber 8 is formed between the lower part of the partition wall 5 and the member 6, and an antifreeze solution or the like is provided in both of the chambers 7, 8. The above liquid is sealed, and the upper and lower chambers 7 and 8 are communicated with each other by an orifice 9 formed in a substantially central portion of the partition wall 5.

A dynamic damper 10 is attached to the main chamber 7 described above.

The dynamic damper 10 includes a metal cylindrical outer cylinder 11 fixed to the partition wall 5, a metal cylindrical bellows 12 provided inside the outer cylinder 11 with a predetermined small distance from the outer cylinder inner wall, and the bellows 12. Inert gas (gas) such as N2 gas sealed inside
And a stopper 13 attached to the inner wall of the outer cylinder 11 on the free end side of the bellows 12, and the stopper 13 regulates the position of the tip of the bellows 12 inward of the tip of the outer cylinder 11.

In the figure, 14 is an engine side mounting bracket, and 15 is a bolt.

The illustrated embodiment is configured as described above, and the operation will be described below.

For example, in the low frequency range of about 10 to 20 Hz, since the liquid passes through the orifice 9 that connects the main chamber 7 and the sub chamber 8 with each other, good damping characteristics can be obtained. It is possible to prevent the engine vibration in the rotation range from being transmitted to the vehicle body.

On the other hand, in the high frequency range of about 200 to 500 Hz, the bellows
When the liquid flows through the relatively narrow space between the outer cylinder 12 and the outer cylinder 11, the liquid exerts a fluid viscosity due to the fluid resistance, and a damping action necessary for the dynamic damper 10 is generated, and the bellows 12 described above is a spring. , Bellows 12 upper and outer cylinder 11
The liquid in the part surrounded by and becomes the dynamic damper 10 that functions as a mass, and the vibration of the dynamic damper 10 can significantly dampen high-frequency vibrations.

As a result, as shown by the solid line characteristic a in FIG. 2, a very good low spring constant could be obtained with respect to the dotted line characteristic b of the conventional device.

Moreover, since the dynamic damper 10 can be configured without providing a mass body unlike the conventional device, there is an effect that the structure of the liquid-filled mount device can be greatly simplified.

Therefore, when the above-mentioned liquid-filled mount device is applied to an automobile engine mount, it is possible to favorably prevent the vibration of the engine in the low to high rotation range from being transmitted to the vehicle body, and to obtain a light feeling in the vehicle interior. You can

FIGS. 3 and 4 show another embodiment of the liquid-filled mount device. In this embodiment, a rubber film 12B as a damping member is fixed to the outer peripheral wall of the metal bellows body 12A, and these 12A and 12B are used. It constitutes the bellows 12.

According to this structure, the damping effect due to the internal friction of the rubber is obtained in addition to the fluid friction, so that the damping of the dynamic damper 10 can be increased.

In other respects, since the same operation and effect as in the previous embodiment are achieved in other points, the same parts as those in FIG. 1 are designated by the same reference numerals in FIGS. 3 and 4 and their detailed description is omitted. To do.

FIG. 5 shows still another embodiment of the liquid-filled mount device. In this embodiment, a slide outer cylinder 16 which is vertically moved by an external operation is attached to the upper outer periphery of the outer cylinder 11 described above, and the slide outer cylinder 16 The mass can be changed by the vertical movement of.

With this configuration, there is an effect that the frequency at which the dynamic damper 10 acts can be variably controlled in response to the above-described mass variation.

In other respects, the same operation and effects as the above-described embodiment are achieved in other respects. Therefore, in FIG. 5, the same parts as those in FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 6 shows still another embodiment of the liquid-filled mount device. In this embodiment, in addition to the dynamic damper 10 described above, another dynamic damper 17 having an attenuation frequency range different from that of the dynamic damper 10 is provided. ing.

The dynamic damper 17 also has a cylindrical outer cylinder 18 and the outer cylinder 18 similar to the dynamic damper 10 described above.
A cylindrical bellows 19 provided at a predetermined small distance from the inner wall of the outer cylinder, a gas such as N2 gas sealed in the bellows 19, and a bellows 19 attached to the inner wall of the outer cylinder 18 at the free end side. A stopper 20 is provided, and the stopper 20 regulates the position of the tip of the bellows 19 inward of the tip of the outer cylinder 18.

As described above, by providing the plurality of dynamic dampers 10 and 17 in the main chamber 7, it is possible to set a plurality of damping frequency ranges, and thus it is possible to obtain a low spring constant in a wide frequency range.

In other respects, the same operation and effect as those of the previous embodiment are achieved, and therefore, in FIG. 6, the same parts as those in FIG. 1 are designated by the same reference numerals, and the detailed description thereof will be omitted.

FIG. 7 shows still another embodiment of the liquid-filled mount device. In this embodiment, a bellows 21 having a relatively large diameter is vulcanized and bonded to the upper wall 3a of the rubber 3 constituting the upper liquid wall of the main chamber 7. Together with the side wall 3b of the rubber 3 that constitutes the side liquid wall of the main chamber 7.
Is also used as the outer cylinder of the dynamic damper 22, and the interval between the inner surface of the side wall 3b of the rubber 3 used as the outer cylinder and the bellows 21 is set to a predetermined small interval.
While enclosing a gas such as N2 gas, the lower end of the bellows 21 is located inward, that is, above the lower end of the side wall 3b.

With this structure, the dynamic damper 22 has a high mass and a low spring constant, and there is an effect that the working frequency of the dynamic damper 22 can be tuned particularly in a low and middle frequency range lower than 200 Hz.

In other respects, the same operation and effect as those of the above-described embodiment are achieved, and therefore, in FIG. 7, the parts of FIG. 1 are given the same numbers and their detailed description is omitted.

FIG. 8 shows still another embodiment of the liquid-filled mount device. In this embodiment, an annular fitting convex portion projecting outward is formed on the outer periphery of the outer cylinder 11 constituting the dynamic damper 10 on the base end side.
On the other hand, while forming 23, a ring-shaped fitting concave portion 24 corresponding to the above-mentioned fitting convex portion 23 is formed in a predetermined portion of the rubber 3 constituting the main chamber 7, and the dynamic damper is formed by fitting these two portions 23, 24 together. 1
It is configured to support 0.

With this configuration, the dynamic damper 10 described above is used.
There is an effect that the mountability of can be greatly improved.

In other respects, since the same operation and effect as those of the previous embodiment are achieved, the same parts as those in FIG. 1 are designated by the same reference numerals in FIG. 8 and their detailed description is omitted.

FIG. 9 shows still another embodiment of the liquid-filled mount device. In this embodiment, in the liquid inlet / outlet portion of the dynamic damper 10, the communication portion 25 between the inside of the outer cylinder 11 and the main chamber 7 in the low frequency range. Is provided, and a decoupler 26 as an ON / OFF means for opening the communication portion 25 in the high frequency region is provided.

According to this structure, the decoupler 26 closes the communicating portion 25 in the low frequency range and suppresses the action of the dynamic damper 10, so that the amount of liquid passing through the orifice 9 in the high frequency range is increased. As a result, there is an effect that the damping performance in the low frequency range can be improved.

In other respects, since the same operation and effect as those of the previous embodiment are achieved in other points, the same parts as those in FIG. 1 are designated by the same reference numerals in FIG. 9 and their detailed description is omitted.

The tenth embodiment shows still another embodiment of the liquid-filled mount device. In this embodiment, the screw portion 27 is integrally formed on the outer peripheral portion of the outer cylinder 11 constituting the dynamic damper 10, while the insulator outer cylinder 2 is formed. Forms a screw hole 28 corresponding to the above-mentioned screw portion 27, and the dynamic damper 10 is detachably attached from the outside of the mount device.

With such a configuration, the dynamic damper 10 can be easily replaced, and therefore, there is an effect that compatibility with other dynamic dampers having a desired attenuation frequency at each mount portion is improved.

In other respects, since the same operation and effect as the above-described embodiment are exhibited in other points, the same parts in FIG. 10 as those in FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted.

FIGS. 11 and 12 show still another embodiment of the liquid-filled mount device. In this embodiment, in addition to the configuration of the previous embodiment shown in FIG. 10, a dynamic damper is provided on the rear surface of the outer cylinder 11. An electromagnetic solenoid 29 as a means for forcibly stopping the movement of 10 is attached, and in the low frequency range, the plunger 30 is projected by energizing the electromagnetic solenoid 29 as shown in FIG. In the high frequency range, the electromagnetic solenoid 29 is de-energized and the plunger 30 is retracted as shown in FIG.
It is configured to allow the movement of.

Here, the above-mentioned electromagnetic solenoid 29 is controlled by the detection means for detecting the engine speed.

With this configuration, the movement of the bellows 12 can be mechanically suppressed by the plunger 30 in the low frequency range, and the action of the dynamic damper 10 can be reliably prevented. It is possible to increase the flow rate of the liquid passing therethrough, and as a result, it is possible to improve the damping performance in the low frequency region.

It should be noted that, in other respects, it has substantially the same operation and effect as the previous embodiment, and therefore, in FIG. 11 and FIG.
The same parts as those in the figure are denoted by the same reference numerals and detailed description thereof will be omitted.

FIG. 13 shows still another embodiment of the liquid-filled mount device. In this embodiment, in addition to the configuration of the previous embodiment shown in FIG. 10, a communication passage for the first air chamber in the bellows 12 is provided. A poppet 36 that opens and closes the communication passage 31 is attached to the tip of a plunger 35 of an electromagnetic solenoid 34 that is connected to the second air chamber 32 via 31 and is attached to the air chamber housing 33.

With this configuration, the spring constant of the single dynamic damper 10 can be changed by connecting and disconnecting both air chambers with the above-described poppet 36 according to the operating state, and the dynamic constant can be changed in response to the change of the spring constant. There is an effect that the frequency at which the damper 10 acts can be variably controlled.

In other respects, since the same operation and effect as the above-described embodiment are achieved in other points, the same parts in FIG. 13 as those in FIG. 10 are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 14 shows another embodiment of the dynamic damper, in which a disc 40 for resistance increase is attached to the upper end of the bellows 12, and in addition to the fluid resistance between the bellows 12 and the outer cylinder 11, The orifice effect may be set even stronger by the restriction 41 between the tube 11 and the cylinder 11.

In other respects, the same operation and effects as the above-described embodiment are achieved, and therefore, in FIG. 14, the same parts as those in FIG. 1 are designated by the same reference numerals, and the detailed description thereof will be omitted.

In short, according to each of the above-described embodiments, a good low spring constant can be obtained, and the dynamic damper can be configured without providing a mass body as in the conventional device. There is an effect that simplification can be achieved.

[Brief description of the drawings]

The drawings show one embodiment of the present invention, FIG. 1 is a cross-sectional view showing a liquid-filled mount device, FIG. 2 is a characteristic diagram showing changes in dynamic spring constant with frequency, and FIG. 3 is another liquid-filled mount device. FIG. 4 is an enlarged sectional view of a bellows of the mounting device shown in FIG. 3, FIG. 5 is a sectional view showing still another embodiment of the liquid-filled mounting device, and FIG. 6 is a liquid. Sectional view showing still another embodiment of the sealed mount device, FIG. 7 is a sectional view showing still another embodiment of the liquid sealed mount device, and FIG. 8 is a sectional view showing still another embodiment of the liquid sealed mount device. FIG. 9, FIG. 9 is a cross-sectional view showing still another embodiment of the liquid-filled mount device, FIG. 10 is a cross-sectional view showing still another embodiment of the liquid-filled mount device, and FIG. 11 is a further view of the liquid-filled mount device. Sectional drawing which shows other Example, 12th Is an enlarged sectional view of the dynamic damper of the mounting device shown in FIG. 11, FIG. 13 is a sectional view showing still another embodiment of the liquid-filled mounting device, and FIG. 14 is an enlarged sectional view showing another embodiment of the dynamic damper. It is a figure. 3b …… Side wall (outer cylinder), 7 …… Main chamber 8 …… Sub chamber, 9 …… Orifice 10,17,22 …… Dynamic damper 11,18 …… Outer cylinder 12,19,21 …… Bellows

 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Takafumi Teramoto 3-1, Shinchi Fuchu-cho, Aki-gun, Hiroshima Mazda Co., Ltd. (72) Inventor Hidetoshi Shintani 3-3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Incorporated (56) References JP 59-151641 (JP, A) JP 61-286632 (JP, A) Actually opened 60-167241 (JP, U) Actually opened 62-188640 (JP, U)

Claims (1)

(57) [Claims] 1. A liquid-filled mount device having a main chamber and a sub-chamber in which a liquid is sealed, and an orifice communicating between the chambers, and a dynamic damper provided in the main chamber, wherein the dynamic damper is A cylindrical outer tube, a cylindrical bellows provided in the outer tube with a predetermined distance from the inner wall of the outer tube, and a gas enclosed in the bellows, and a tip of the bellows is formed by an outer tube. Liquid-filled mounting device located inward of the tip.