KR100204905B1 - Hydraulic engine mounting of automobile - Google Patents

Abstract

The present invention relates to a fluid-enclosed engine mount with adjustable damping force, and the case (1) as a damping force adjusting means that 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 engine is idling, an orifice structure 7 composed of a gap plate 8 provided laterally in the transverse direction and a cylindrical rubber film 9 disposed upright on the central opening of the gap plate 8 is provided. When vibrations at high frequency micro displacement are input to the fluid-filled engine mount, such as during constant speed driving, the fluid flows freely into the rubber membrane 9 to absorb vibrations, thereby reducing vibration noise of the vehicle, as well as fluctuations in torque and shift, When vibration at low frequency large displacement is input to the fluid-filled engine mount, such as during acceleration and deceleration, the rubber membrane 9 shrinks and deforms, so that the fluid obtains high damping force. Of the vibration becomes the effect that can be controlled.

Description

Fluid-sealed engine mount with adjustable damping force

The present invention relates to a fluid-enclosed engine mount that supports it from the bottom when the engine is mounted on a vehicle. The present invention relates to a fluid-filled engine mount with adjustable damping force for effective vibration control.

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-filled engine mount is fastened to a case 21 having a concave shape at a lower portion thereof, and a rubber at the upper portion thereof and a predetermined portion of the engine at the upper portion thereof. By fixing the center boss 22 is a hollow rubber part 23 is formed in a hollow shape is coupled to form a closed space therein, the inner space is divided into two vertically divided through the separation plate 24 The fluid flows into the waste space formed by the upper liquid chamber 25 in which fluid is sealed into the waste space formed by the 23 and the separating plate 24, and the diaphragm 27 fixed to the separating plate 24 and its lower portion.The separation plate 24 is partitioned into an enclosed lower liquid chamber 26, while the separation plate 24 separates the fluid encapsulated therein so as to flow into the upper liquid chamber 25 and the lower liquid chamber 26 during high frequency microvibration of the engine. Micro-displacement vibration damping means comprising a decoupler 28 which is fitted with a plate 24 having a small free-moving gap, and shakes up and down over a predetermined displacement, and the fluid of the upper liquid chamber 25 at the time of vibration of the low frequency large displacement of the engine. The large displacement vibration damping means made up of the orifice 29 having a through passage of a predetermined diameter so as to obtain a damping force by friction when the gas flows into the lower liquid chamber 26 is provided through the separation plate 24.

Therefore, in the conventional engine mount, when the vibration of the high frequency non-amplitude is input from the engine to the upper liquid chamber 25 through the center boss 22 and the high-pressure unit 23, the vibration is enclosed in the upper liquid chamber 25. In this case, the fluid does not pass through the orifice 29 mounted on the separator plate 24 and flows into the decoupler 28, which is a micro displacement vibration damping means having a relatively small flow resistance. Vibration is attenuated by the up-and-down movement over the fine free movement gap of the decoupler 28.

In addition, when the vibration at the low frequency large displacement from the engine is input to the upper liquid chamber 25, the fluid enclosed in the upper liquid chamber 25 has a large amplitude, so that the decoupler 28 inserted while maintaining a minute gap in the separation plate 24 is provided. ), The free moving gap is easily closed, so that the fluid flows into the lower liquid chamber 26 through the through passage of the orifice 29, which is a large displacement vibration damping means mounted on the separator plate 24. Due to the flow friction with the inner wall of the through passage of 29), a large damping force is applied and vibration is damped.

However, the fluid-mounted engine mount as described above has a uniform structure in which the orifice 29 which exhibits a high damping force in the vibration at the low frequency large displacement transmitted from the engine during operation of the engine to control the vibration of the engine is not variable in cross-section thereof. Since the degree of attenuation exerted by the input vibration cannot be varied, the engine vibration cannot be effectively attenuated.

Therefore, there has been a demand for a new type of fluid-enclosed engine mount that can vary the cross-sectional size of the orifice 29, which is the large displacement vibration damping means, in response to the input vibration.

Accordingly, the present invention has been made in view of the above-mentioned point, and by inventing an engine mount having damping force adjusting means which can appropriately change the damping force according to the magnitude of the vibration input transmitted therefrom during operation of the engine. In order to provide a fluid-mounted engine mount with adjustable damping force, which enables low vibration damping force and high damping force at low frequency large displacement, which can lead to effective vibration control. There is this.

1 is a fluid-enclosed engine mount according to the prior art.

2 is a cross-sectional view of the fluid-mounted engine mount of the damping force adjustable according to the present invention.

* Explanation of symbols for main parts of the drawings

1 case 2 center boss

3: chigomubu 4: diaphragm

5: upper liquid chamber 6: lower liquid chamber

7: orifice structure 8: gap plate

9 rubber film 10 support member

11: guide member

The present invention for achieving the above object is a closed space formed by combining the case and the upper portion of the rubber with the center boss fixed on the upper part can cope with both vibration at low frequency and vibration at high frequency microdisplacement. Characterized in that the damping force adjustment means is made.

To this end, the damping force adjusting means includes an orifice which is fixed to an inner wall of the case and partitions the inner space of the case in a transverse direction, and a cylindrical rubber film which is disposed upright on the central opening of the gap plate. Characterized in that the structure.

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

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

As shown in the drawing, 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 rubber is made of a material on the top thereof. The rubber part 3 having a shape is combined to form a closed space therein, and the closed space therein is a part of the damping force control means for appropriately damping the vibration transmitted from the engine. The orifice structure 7 which can cope with all the vibrations of a city is provided and comprised.

In addition, the diaphragm 4 is disposed on the bottom surface of the case 1 in a transverse direction to form a liquid chamber in which the fluid is sealed together with the case 1, the center boss 2, and the rubber part 3. The seal is divided into two parts by the upper liquid chamber 5 and the lower liquid chamber 6 via the orifice structure 7.

Here, the orifice structure 7, which is the damping force adjusting means, has a disc shaped gap plate 8 having a tip portion fixed to an inner wall of the case 1 and dividing the inner space of the case 1 into a horizontal direction. And a cylindrical rubber film 9 made of a somewhat flexible material, which is arranged upright on the central opening of the gap plate 8.

In addition, the support member 10 which is press-fitted on the central opening of the gap plate 8 and is bent upward and disposed upright is fixed to the lower portion of the rubber membrane 9, and the upper end of the rubber membrane 9 is fixed. An inner diameter is enlarged toward the outer side, and the guide member 11 is fixed to smooth the fluid inside the upper liquid chamber 5 when it flows into the inside.

Therefore, in the engine mount of the present invention having the orifice structure 7 as described above, first, when the engine is oscillated at a high frequency microdisplacement such as when idling or running at constant speed, the orifice structure 7 is input. The rubber membrane 9 can maintain its original inner diameter without being deformed, so that the fluid flowing between the upper liquid chamber 5 and the lower liquid chamber 6 can obtain a low damping force and exhibit low copper spring constant characteristics. .

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 other hand, when vibration at low frequency large displacement is input to the fluid-filled engine mount, such as fluctuation, shift, acceleration and deceleration of the engine torque, the internal pressure in the upper liquid chamber 5 increases, and thus the rubber membrane 9 This contraction causes the cross-sectional area of the orifice structure 7 to be reduced, i.e., the cross-sectional area of the orifice is reduced so that the fluid flowing between the upper liquid chamber 5 and the lower liquid chamber 6 obtains a high damping force to obtain high copper spring constant characteristics. It becomes possible to exercise.

Accordingly, the vibration at the low frequency large displacement is absorbed by the high damping force of the engine mount, so that the engine vibration is effectively 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 which consists of the clearance plate 8 provided in the case 1 in the horizontal direction, and the cylindrical rubber film 9 arrange | positioned upright on the center opening of this clearance plate 8 is provided, When the vibration at high frequency micro displacement is input to the fluid-enclosed engine mount, such as when the engine is idling or driving at constant speed, the fluid flows freely into the rubber membrane 9 to absorb the vibration, thereby reducing the vibration noise of the vehicle. When vibrations at low frequency large displacements, such as fluctuations, shifts, and accelerations and decelerations, are input to the fluid-mounted engine mount, the rubber membrane 9 contracts and deforms, thereby allowing fluid The high damping force can be obtained to control the vibration of the engine.

Claims (1)

Low frequency large displacement while being divided into a case 1 and an upper / lower liquid chamber enclosing a fluid into a closed space formed by combining the upper and lower rubber parts 3 to which the center boss 2 is fixed on the upper part of the case 1. In a fluid-filled engine mount of a vehicle provided with a large displacement vibration damping means for damping vibrations of the high frequency microdisplacement and a vibration damping means of the small displacement, respectively, the inner space of the case 1 is transversely directed. The gap plate 8 attached to the inner wall so as to be partitioned by the inner wall, the support member 10 pressed against the center opening of the gap plate 8, bent upward and disposed upright, and the support member 10 A damping force, characterized in that the damping force adjustment means comprising a cylindrical rubber membrane (9) coupled to the upper end, the guide member 11 is fixed to the upper end of the rubber membrane (9) and its inner diameter is expanded toward the outside. 2 adjustable fluid-sealed engines Unt.