KR0142547B1 - Device of engine mounting for an automobile - Google Patents

Abstract

SUMMARY OF THE INVENTION The present invention relates to a liquid-sealed engine mount for a vehicle that is capable of actively absorbing vibrations of an automobile engine to improve ride comfort.

In order to realize this, the present invention provides a liquid-sealed engine mount that prevents transmission of normal engine vibration to the vehicle body, wherein the liquid-sealed engine mount is attached to one side of an inner circumferential surface of the exterior and has an inner diameter. Liquid sealing of a vehicle including a liquid injection chamber, a rubber member having a sub-liquid chamber and a third liquid chamber on both sides of the liquid injection chamber on both sides of the lower end thereof, and an inner tube of a small diameter formed to be fastened with a bolt while being covered with the rubber member and exposed to the outside. It features an engine mount.

Description

Liquid-filled engine mount of the car

Figure 1 schematically shows the mounting state of the liquid-filled engine mount of the present invention

Figure shown.

2 is a perspective view of a partially cut away liquid enclosed engine mount of the present invention.

3 is a side cross-sectional view of a liquid-filled engine mount of the present invention.

Figure 4 is a side cross-sectional view for explaining the operating state of the second diaphragm of the third liquid chamber of the liquid-sealed engine mount of the present invention.

FIG. 5 is an enlarged side sectional view of the second diaphragm of the third liquid chamber of the third liquid chamber of FIG.

* Explanation of symbols for main parts of the drawings

10: Appearance 12: Injection room

14: Liquid room 16: Third liquid room

18: rubber member 20: inner tube

22: reinforcement 24: the second communication unit

26: second diaphragm 28: first diaphragm

30: First communication part

[Industrial use]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid enclosed engine mount, and more particularly, to a liquid of an automobile, in which a vibration input to a vehicle body can be minimized by increasing attenuation at a specific input vibration frequency and vibration displacement in a vibration region generated during engine driving. It relates to an enclosed engine mount.

[Prior art]

In general, the engine, which is the power source of the automobile, changes the center position by the vertical movement of the piston and connecting rod periodically during the intake compression explosion exhaust stroke cycle and generates the inertial force of the reciprocating part generated in the cylinder axial direction. These vibration causes are combined to cause the vibration in the left and right direction and the vertical direction.

In addition, the vibration of the engine as described above is generated larger than the engine with a large number of cylinders, the engine with a small number of cylinders, and occurs at a low speed than the high speed. Since the vibration of the engine is transmitted to the chassis to make the ride of the vehicle worse, the insulator exerting elastic force is placed on the engine mount to absorb the vibration of the engine, thereby improving the ride of the vehicle.

However, as described above, the engine mount insulator of a conventional vehicle, which is used as a means for preventing the vibration of the engine from being transmitted to the chassis when the engine is mounted, has a structure of simply placing an elastic rubber member between the upper and lower plates. In addition to passively absorbing large vibrations and small vibrations under the same conditions, the elastic restoring force decreases after a certain period of time and cannot function properly. In recent years, an insulator having a structure filled with a fluid inside a rubber member is generally used. Although it uses but also provides an elastic restoring force as compared to the prior art, it does not obtain a satisfactory effect.

[Problem trying to solve the invention]

In the above-mentioned prior art, the liquid-filled engine mount placed between the engine and the vehicle body is applied to prevent the vibration of the engine from being transmitted to the vehicle body, which is generated while the liquid enclosed therein passes through a communication portion connecting the two liquid chambers. By using the fluid friction to obtain a high damping value, the vibration propagation is attenuated in the low frequency large amplitude input. However, in the high frequency unamplified input, there is a problem of increasing the vibration transmission rate by increasing the dynamic stiffness of the engine mount.

In addition, in order to solve the point of increasing the vibration transmission rate by increasing the dynamic stiffness of the engine mount when the communication unit passes through the high attenuation value, the engine mount such as selecting a communication unit for each frequency and operating a separate device. Have been devised and used, but there is a problem that the price is expensive as the structure is complicated and requires a separate control device.

[Means to solve the problem]

SUMMARY OF THE INVENTION The present invention relates to a liquid-sealed engine mount for a vehicle that is capable of actively absorbing vibrations of an automobile engine to improve ride comfort.

In order to achieve this, the present invention provides a liquid-sealed engine mount for preventing engine vibration from being transmitted to a vehicle body, wherein the liquid-sealed engine mount has an inner diameter with a predetermined inner diameter, and one side is attached to an inner circumferential surface with an inner circumferential surface attached thereto. A liquid encapsulation engine of a vehicle comprising a rubber member having a third liquid chamber formed on both sides of a liquid-liquid chamber and a liquid-injection chamber on both sides of a lower end thereof, and an inner tube of a small diameter formed to be fastened with a bolt by being exposed to the outside while being wrapped with the rubber member. It features a mount.

The present invention provides a liquid-filled engine mount for a vehicle including a liquid injection chamber formed to fill a fluid between third liquid chambers formed on both sides of the inner tube wrapped with the rubber member.

A second communication portion formed of a reinforcing piece attached to the rubber member so that the hydraulic pressure passes by the internal pressure generated in the liquid injection chamber, and a second diaphragm formed by a hydraulic pressure passing through the opposite surface of the second communication portion. It is to provide a liquid-sealed engine mount of a vehicle comprising a three-liquid chamber.

One side surface is formed on both sides of the lower end of the inner tube wrapped with the rubber member, the other side is to provide a liquid-filled engine mount of the vehicle comprising a liquid-liquid chamber formed of a rubber member that is the first diaphragm.

It is to provide a liquid-sealed engine mount of a vehicle comprising a first communication portion formed on the other side by the rubber member and the other side is in communication with each other so that the raised hydraulic pressure of the liquid injection chamber is moved to the two side liquid chambers.

It is to provide a liquid-mounted engine mount of a vehicle that can change the dynamic characteristics of the engine mount by adjusting the cross-sectional ratio of the first communication portion and the second communication portion.

An object of the present invention is to provide a liquid-filled engine mount for a vehicle that can change the dynamic characteristics of the engine mount by adjusting the elasticity of the second diaphragm.

An object of the present invention is to provide a liquid-filled engine mount for a vehicle that can change the dynamic characteristics of the engine mount by adjusting the cross-sectional area of the second communication portion.

[Action]

In the present invention described above, when the fluid is filled in each liquid chamber and each communication unit, and the vibration is input through the appearance connected to the engine side (even if the inner tube side is connected to the engine according to the installation method, the vibration is input through the inner tube). As the rubber part of the engine mount is deformed, the liquid pressure in the injection chamber rises, and the enclosed fluid moves the first communication section to the subdivision chamber, causing fluid friction to increase the damping value, thereby reducing the vibration input to the vehicle body side fastened to the inner tube. .

When the vibration input to the engine mount is below a certain frequency and the amplitude is above a certain value and the internal pressure of the injection chamber rises rapidly through the above appearance, the hydraulic pressure moves to the third liquid chamber connected to the injection chamber and the second communication section. The second diaphragm constituting one wall surface of the three liquid chambers is deformed toward the first communication portion to reduce the cross-sectional area of the first communication portion.

As described above, as the cross-sectional area of the first communication portion is reduced, the fluid friction of the fluid moving to the subdivision chamber rapidly increases, and the damping value is increased to reduce the vibration input of the vehicle body side through the inner tube.

When the vibration is input to the engine mount and the high frequency is not amplified, the fluid in the third liquid chamber connected to the injection chamber and the second communication portion absorbs the fluid vibration in the injection chamber by the expansion of the second diaphragm, resulting from fluid resonance in the injection chamber. The vibration input to the vehicle body side is reduced by eliminating the dynamic stiffness.

The input vibration frequency and vibration displacement at which the second diaphragm is expanded are adjusted by adjusting the cross-sectional ratio of the first communication portion and the second communication portion or by adjusting the elasticity of the second diaphragm, or by adjusting the cross-sectional ratio between the communication portions and the second diaphragm elasticity. Adjusted together.

EXAMPLE

Hereinafter, a preferred embodiment of the present invention will be described in more detail with reference to the accompanying drawings.

1 is a view schematically showing the mounting state of the liquid-filled engine mount of the present invention, FIG. 2 is a perspective view of the liquid-filled engine mount of the present invention cut away, Figure 3 is a side cross-sectional view showing the liquid-filled engine mount of the present invention. to be. 2 denotes an engine mount.

The engine mount 2 described above is provided between the engine 4 and the transmission 6 and the vehicle body 8 of the vehicle to prevent the vibration of the engine 4 from being transmitted to the vehicle body 8.

The engine mount 2 has an exterior 10 having a predetermined internal diameter, and one side of the inner circumferential surface of the exterior 10 is attached to the injection chamber 12 on the upper side, and the liquid injection chamber 14 and the injection chamber on both sides of the lower end ( 12) and a rubber member 18 having a third liquid chamber 16 formed on both sides thereof, and an inner tube 20 of a small diameter formed to be fastened with a bolt while being wrapped with the rubber member 18 and exposed to the outside. have.

The liquid injection chamber 12 is filled with fluid between the third liquid chamber 16 formed on both sides of the upper side of the inner tube 20 wrapped with the rubber member 18.

The third liquid chamber 16 includes a second communication portion 24 made of a reinforcing piece 22 attached to the rubber member 18 so that the hydraulic pressure passes by the internal pressure generated in the liquid injection chamber 12, and the second The 2nd diaphragm 26 which the hydraulic pressure which passed to the opposite surface of the communication part 24 acts is formed.

In addition, one side surface is formed in the subsidiary liquid chamber 14 to which the hydraulic pressure of the liquid injection chamber 12 is applied, as the exterior 10 on both sides of the lower end of the inner tube 20 wrapped with the rubber member 18, and the other side is made of One diaphragm 28 is formed of a rubber member 18.

The first communication part 30, which is a passage of the fluid filled in the liquid injection chamber 12, has one side of the rubber member 18 such that the raised liquid pressure of the liquid injection chamber 12 moves to the respective sub-liquid chambers 14 on both sides. The other side is formed in the appearance (10) is made to communicate with each other.

The second communication portion, which is a passage through which the hydraulic pressure of the first communication portion 30 and the injection liquid chamber 12 communicating between the liquid injection chamber 12 and the liquid injection chamber 14 is applied to the third liquid chamber 16 ( 24, each of the cross-sectional areas (C), (D) ratio can be adjusted to change the dynamic characteristics of the engine mount (2), and the elasticity of the second diaphragm (26) to adjust the dynamics of the engine mount (2) Can change the characteristics.

Input vibration frequency and vibration displacement at which the second diaphragm 26 of the engine mount 2 is expanded by adjusting the cross-sectional area D of the second communication portion 24 or the elasticity of the second diaphragm 26 as described above. It can change the dynamic characteristics of.

In the engine mount according to the present invention, as shown in FIGS. 4 and 5, when the vibration of the engine 4 is input to the engine mount 2 through the exterior 10, the exterior 10 is the injection chamber 12. Pressure is applied to the fluid in the direction of the arrow up and down as the direction of arrow (A).

The external appearance 10 applies pressure to the fluid of the pouring chamber 12 and the third liquid chamber 16 by the amplitude of the vibration generated up and down in the direction of the arrow A.

As the injection chamber 12 and the third liquid chamber 16 are pressurized, the injection chamber 12 and the third liquid chamber 16 formed of the rubber member 18 cause deformation.

As the injection chamber 12 and the third liquid chamber 16 are deformed as described above, pressure is applied to the fluid contained in the injection chamber 12, resulting in an increase in the pressure of the liquid. The fluid moves to the liquid-liquid chamber 14 through the first communication portion 30 by moving in the direction of the arrow B on the inner circumferential surface.

In addition, the one end of the fluid moves through the first communication portion 30, the other fluid passes through the second communication portion 24 to the third liquid chamber (16). At this time, since the fluid entering the third liquid chamber 16 is applied with hydraulic pressure, the hydraulic pressure is applied to the second diaphragm 26 formed on the opposite side of the second communication portion 24.

As described above, the fluid in the liquid injection chamber 12 simultaneously moves in the direction of arrow B to pass through the first communication unit 30 and the hydraulic pressure moved to the third liquid chamber 16 moves the second diaphragm 26. To operate.

As a result, the second diaphragm 26 of the third liquid chamber 16 reduces the cross-sectional area C of the first communication part 30, so that the fluid that tries to pass through the first communication part 30 is increased in the frictional fluid. Since the movement is attenuated by bringing the vibration to be transmitted to the vehicle body through the exterior (10).

[Effects of the Invention]

The present invention reduces the vibration input to the vehicle body by increasing the attenuation value (loss coefficient, loss angle) at the specific input vibration frequency and vibration displacement.

In addition, when the high frequency non-vibration input is performed, the fluid in the third liquid chamber absorbs the fluid vibration in the injection chamber by the expansion of the second diaphragm, thereby suppressing the increase in dynamic stiffness caused by the fluid resonance in the injection chamber, thereby reducing the vibration input to the vehicle body. The attenuation value is adjusted by adjusting the cross-sectional ratio of the part and the second communication part.

By adjusting the cross-sectional ratio of the first communication section and the second communication section, the input frequency range in which the dynamic characteristics are increased is adjusted, and the cross-sectional ratio of the first communication section and the second communication section is adjusted by adjusting the elasticity of the second diaphragm. This results in the effect of adjusting the input frequency range where the attenuation value and dynamic characteristics increase.

Claims (5)

In a liquid-sealed engine mount that prevents normal engine vibrations from being transmitted to the vehicle body, the liquid-sealed engine mount has an exterior with a predetermined inner diameter, and is attached to one side of the inner circumferential surface thereof and pours the liquid into the upper side and the lower side of both sides. And a rubber member having a third liquid chamber formed on both sides of the seal and the liquid injection chamber, and an inner tube of a small diameter formed to be fastened with a bolt while being exposed to the outside while being enclosed by the rubber member. A liquid-filled engine mount of a vehicle, which is connected to a communication unit, and the liquid injection chamber and the third liquid chamber are connected to a second communication unit such that the dynamic characteristics of the engine mount are varied by the cross-sectional ratios of the first and second communication units. The liquid enclosed engine mount of claim 1, wherein the sub-liquid chamber or the third liquid chamber includes a diaphragm that is variable by hydraulic pressure. 3. The liquid-sealed engine mount of claim 1 or 2, wherein the third liquid chamber is provided with a reinforcing piece on the side of the second communication portion for changing the diaphragm. 2. The liquid-mounted engine mount of claim 1, wherein a lower portion of the inner tube is formed of a first diaphragm with a part of the rubber member, and the other side of the first diaphragm includes a sub-liquid chamber formed as an exterior. 2. The liquid-filled engine mount of claim 1, wherein the dynamic variable characteristic of the engine mount controls the flow of hydraulic pressure by varying the first communication portion by the expansion and contraction of the second diaphragm.