KR19980043815A - Fluid-sealed engine mount with adjustable damping force - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid-enclosed engine mount with adjustable damping force. The orifice structure (7) is provided as a damping force adjusting means capable of appropriately changing the damping value according to the magnitude of vibration or noise transmitted from the engine to the vehicle body during operation of the engine. And the equidistant membrane 8 are provided, when the high frequency microdisplacement vibration is input to the fluid-enclosed engine mount, such as when the engine is idling or running at a constant speed, a plurality of movable plates 8a forming the equal membrane 8 are spaced apart. By freeing the flow of fluid between the upper liquid chamber 5 and the lower liquid chamber 6, the vibration noise of the vehicle is reduced, as well as vibration at low frequency large displacement such as torque fluctuations, shifts, and accelerations and decelerations. When it is input to the mount, the movable plates 8a constituting the equal membrane 8 are pressed down and stuck together so that fluid flow between the upper liquid chamber 5 and the lower liquid chamber 6 is not free. Something to the effect that it is possible to control the vibration of the engine.

Description

Fluid-sealed engine mount with adjustable damping force

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid-enclosed engine mount for supporting an engine when the engine is mounted on a vehicle. More particularly, the fluid flows through an equal membrane that expands or contracts according to an input size of vibration transmitted during operation of the engine. The present invention relates to a fluid-filled engine mount in which the damping force is adjustable so that the cross-sectional area of the space to be varied can be varied to appropriately change the damping value.

In general, the engine of a vehicle is generated by the periodic change of the center position due to the vertical movement of the piston and the connecting rod, the inertia force generated in the reciprocating part in the cylinder axial direction, and the connecting rod swinging from the left and right of the crankshaft. Vibration and noise are generated during operation due to the inertia force and the periodic change of the rotation force applied to the crankshaft.

Accordingly, the engine is made of rubber with appropriate spring stiffness at a number of points (usually 3 or 4 points) on the engine to minimize vibrations transmitted to the vehicle body during operation or to control the movement of the engine to improve durability. It is mounted in the engine compartment via a part called an engine mount.

However, the engine mount made of a single rubber material used to achieve the above object has a low rigidity so as to exhibit vibration insulation characteristics to minimize vibration noise of the vehicle from high frequency micro vibration transmitted to the vehicle body during operation of the engine. And the contrary requirements of high stiffness and high damping force to control the engine vibration by suppressing the engine shank in the low frequency large displacement vibration, and on the contrary, to exhibit low damping force. Could not be satisfied.

Therefore, a fluid-mounted engine mount that can appropriately attenuate vibrations over a wide range of areas, such as high frequency unamplified vibrations input to the engine mount or vibrations at low frequency large displacements, is provided according to the operation of the engine. As shown in FIG. 1, the conventional fluid-enclosed engine mount is fastened to a case 11 having a concave shape at the bottom and a predetermined portion of the engine at the upper portion of the center while being made of rubber. By fixing the center boss 12 is a hollow rubber part 13 made of a hollow shape is coupled to form a closed space therein, the inner space is divided into two up and down via the separator plate 14 The fluid flows into the waste space formed by the upper liquid chamber 15 in which the fluid is enclosed by the waste space formed by the 13 and the separating plate 14, and the diaphragm 17 fixed to the lower portion of the upper liquid chamber 15. The separating plate 14 is partitioned into the lower liquid chamber 16, while the separating plate 14 has a fluid encapsulated therein so as to flow into the upper liquid chamber 15 and the lower liquid chamber 16 during high frequency microvibration of the engine. A micro displacement vibration damping means comprising a decoupler 18 which is fitted with a fine free movement gap in the 14 and is capable of shaking up and down over a predetermined displacement, and the fluid of the upper liquid chamber 15 at the time of vibration of the low frequency large displacement of the engine A large displacement vibration damping means made up of an orifice 19 having a through passage of a predetermined diameter so as to obtain a damping force by friction when flowing into the lower liquid chamber 16 had a structure provided through the separating plate 14.

Thus, in the conventional engine mount, when the vibration of the high frequency non-amplitude is input from the engine to the upper liquid chamber 15 via the center boss 12 and the high-pressure unit 13, the fluid enclosed in the upper liquid chamber 15 is supplied. At this time, the fluid flows into the decoupler 18, which is a small displacement vibration damping means having a relatively small flow resistance, rather than through an orifice 19 mounted on the separator plate 14, and has a small displacement of the fluid. The vibration of is attenuated by the vertical shaking operation over the fine free movement gap of the decoupler 18.

In addition, when the vibration at the low frequency large displacement from the engine is input to the upper liquid chamber 15, the fluid enclosed in the upper liquid chamber 15 has a large amplitude, so that the decoupler 18 inserted while maintaining a minute gap in the separation plate 14 is provided. ), The free moving gap is easily closed, so that the fluid flows into the lower liquid chamber 16 through the through passage of the orifice 19, which is a large displacement vibration damping means mounted on the separator plate 14. Due to the flow friction with the inner wall of the through passage of 19), a large damping force is applied and vibration is damped.

However, in the fluid-filled engine mount as described above, the decoupling 18 alone minimizes the dynamic spring constant value in order to reduce the vibration noise of the vehicle by showing a small damping force in the vibration at the high frequency microdisplacement transmitted from the engine during operation of the engine. Since it is impossible to do this, there has been a need for a new type of fluid-enclosed engine mount capable of exhibiting low damping force for effective vibration isolation.

Accordingly, the present invention has been made in view of the above, and by devising an engine mount having a damping force adjusting means that can appropriately change the damping force according to the magnitude of the vibration input transmitted from the engine during operation. The purpose of the present invention is to provide a fluid-mounted engine mount with adjustable damping force that enables low vibration damping force and high damping force at low frequency large displacement to induce effective vibration control.

1 is a cross-sectional view of a fluid-enclosed engine mount according to the prior art,

Figure 2 is a cross-sectional view of the configuration of the fluid-filled engine mount adjustable damping force according to the present invention,

Figure 3 is a plan view showing a half divided state or evenly bonded state of the main parts of the present invention.

Explanation of symbols on the main parts of the drawings

1-Case 2-Center Boss

3-ply rubber 4-diaphragm

5-upper liquid chamber 6-lower liquid chamber

7-orifice structure 7a-opening

8-equalization 8a- movable plate

The present invention for achieving the above object is a large displacement vibration damping means for controlling the vibration during the low frequency large displacement into a closed space formed by combining the case and the upper portion of the rubber with the center boss fixed to the upper portion, It characterized in that the damping force adjusting means composed of a micro displacement vibration damping means for controlling the vibration during the micro displacement.

To this end, the large displacement vibration isolating means, characterized in that consisting of an orifice structure in which the edge is mounted on the inner wall of the case while penetrating the central portion in an annular shape.

In addition, the micro-displacement vibration damping means is a disk in which a plurality of movable plates are radially divided toward a center, and is made of an equal membrane mounted to face each other at a slight inclination above and below the central through portion of the orifice structure.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a cross-sectional view of the configuration of the fluid-enclosed engine mount is adjustable damping force according to the present invention, Figure 3 is a plan view showing the half-divided state of the equal-dividend is divided into two parts of the present invention.

As shown in the drawings, the fluid-mounted engine mount of which the damping force is adjustable is fixed to the case 1 having a concave shape at the bottom and the center boss 2 at the top of the center while the material is rubber at the top thereof, Large displacement vibration damping means having a shape coupled to the rubber portion (3) to form a closed space therein, to control the vibration when the low frequency large displacement is input as part of the damping force control means in the closed space therein; When the vibration of the high frequency microdisplacement is input, the microdisplacement vibration isolating means for controlling the vibration is respectively provided.

In addition, the diaphragm 4 is disposed on the bottom of the case 1 in the lateral direction to form a liquid chamber in which the fluid is enclosed with the case 1, the center boss 2, and the rubber part 3, which is a liquid chamber. The large displacement vibration damping means is divided into two subdivided vibration damping means and divided into an upper liquid chamber 5 and a lower liquid chamber 6.

Here, the large displacement vibration damping means of the damping force adjusting means has an annular structure in which an outer circumferential surface is mounted on the inner wall of the case 1 and has an orifice structure 7 at the edge thereof.

Openings 7a communicating with the upper liquid chamber 5 and the lower liquid chamber 6 are provided at upper and lower portions of the orifice structure 7, respectively.

In addition, the micro-displacement vibration damping means of the damping force adjusting means is mounted to face each other at a slight inclination above and below the central through portion of the orifice structure 7 mounted on the inner wall of the case 1, the shape of which is centered. To this end, a plurality of movable plates 8a are formed in the form of a disk-like equal-division 8 divided radially.

A plurality of movable plates 8a constituting the equal membrane 8 are elastically vulcanized up and down on the inner circumferential surface of the orifice structure 7 and flow between the upper liquid chamber 5 and the lower liquid chamber 6. The movable plates 8a may be kept spaced apart from each other by the pressure of the fluid, or may be in a coalesced state that is bent and stuck by the hydraulic pressure.

Looking at the operation of the engine mount adjustable damping force as described above as follows.

First, when the engine is oscillated at a high frequency microdisplacement such as when idling or running at constant speed, the fluid-mounted engine mount is input. At this time, as shown in the left side of FIG. A plurality of movable plates (8a) that are made up is spaced apart in their original state to free the flow of fluid between the upper liquid chamber (5) and the lower liquid chamber (6).

Therefore, vibration at high frequency microdisplacement is insulated by low damping force of engine mount and minimized dynamic spring constant, thereby reducing vibration noise of vehicle.

On the contrary, when the vibration at the low frequency large displacement is input to the fluid-mounted engine mount, such as when the engine torque is changed, shifted, and accelerated and decelerated, as shown in the right side of FIG. 8) The plurality of movable plates 8a constituting the plurality of movable plates 8a are forced under pressure from the flowing fluid and are slightly bent and adhered to each other, thereby preventing the flow of fluid between the upper liquid chamber 5 and the lower liquid chamber 6 freely. give.

Therefore, the fluid due to the vibration at the low frequency large displacement does not pass through the equal membrane 8, and flows between the upper liquid chamber 5 and the lower liquid chamber 6 through the opening 7a of the orifice structure 7. A large damping force is obtained so that the vibration of the engine can be controlled.

As described above, according to the fluid-mounted engine mount in which the damping force is adjustable according to the present invention, the damping force adjusting means can appropriately change the damping value according to the magnitude of vibration or noise transmitted from the engine to the vehicle body during operation of the engine. As the orifice structure 7 and the equipotential membrane 8 are provided, a plurality of movable plates constituting the equipotential membrane 8 when vibration at high frequency microdisplacement is input to the fluid-enclosed engine mount, such as when the engine is idle or running at constant speed. Vibration noise of the vehicle is reduced by freeing the flow of fluid between the upper liquid chamber 5 and the lower liquid chamber 6, which are spaced apart from each other (8a), as well as vibration at low frequency displacement, such as torque fluctuations, shifts, and accelerations and decelerations. When it is input to the fluid-enclosed engine mount, the movable plates 8a constituting the equal membrane 8 are pressed down and stuck to each other, and the oil is separated between the upper liquid chamber 5 and the lower liquid chamber 6. It is possible to control the vibration of the engine by making the flow of the sieve free.

Claims (5)

Large displacement vibration damping means for controlling the vibration of the low frequency large displacement in the closed space formed by the case (1) and the upper and lower rubber parts (3) to which the center boss (2) is fixed to the upper portion thereof, A fluid-enclosed engine mount with adjustable damping force provided by a damping force adjusting means composed of a micro displacement vibration damping means that controls the vibration. The damping force is adjustable according to claim 1, characterized in that the large displacement vibration isolating means is formed of an orifice structure (7) having an annular shape and an edge thereof mounted on the inner wall of the case (1). Fluid-enclosed engine mounts. 3. A fluid-filled engine mount according to claim 2, wherein openings (7a) are provided at upper and lower portions of the orifice structure (7) to communicate with the upper liquid chamber (5) and the lower liquid chamber (6), respectively. 2. The microdisplacement vibration isolating means according to claim 1, wherein the microdisplacement vibration damping means is in the form of a disk in which a plurality of movable plates 8a are radially divided toward the center so as to be inclined slightly above and below the central through portion of the orifice structure 7 so as to face each other. A damping force adjustable fluid-enclosed engine mount, characterized in that it consists of a mounted equipotent membrane (8). 5. The movable plate (8a) of the equipotential membrane (8) according to claim 4, wherein the movable plate (8a), which is formed as an elastic material, flows between the upper liquid chamber (5) and the lower liquid chamber (6) while being fixed up and down on the inner circumferential surface of the orifice structure (7). An adjustable damping force-mounted engine mount, characterized in that it is spaced apart or adhered to each other by the pressure of the fluid.