KR20180117797A - Structure of engine-mount - Google Patents

Abstract

The present invention provides a structure of an engine mount, in which an interior of the engine mount is divided into an upper liquid chamber and a lower liquid chamber by a nozzle plate and liquid flows through the upper liquid chamber and the lower liquid chamber via a flow path formed in the nozzle plate. The structure of an engine mount includes: an insulator coupled to a core connected to an engine and elastically deformed according to vibration and a load change transmitted to the core; an inner case coupled to a lower portion of the insulator; a lower cup coupled to a lower end of the inner case to form a liquid chamber with the insulator; and a nozzle plate coupled to the inner case through a membrane so as to partition the liquid chamber into the upper liquid chamber and the lower liquid chamber and having a fluid passage for opening the upper liquid chamber and the lower liquid chamber. The membrane is made of a material which can be elastically deformed, and the nozzle plate is directly connected to the core to move together with the core. In the engine mount having the above configuration according to the present invention, as the nozzle plate and the core move together, the liquid moves due to the vibration input to the core (because the vibration input to the core directly acts as a force for moving the liquid), so that the damping effect can be increased by simultaneously generating mass damping caused by resonance and friction damping caused by friction. The noise caused by the rattle and the cavitation generated in the nozzle plate is insulated by the membrane, so that the noise can be suppressed.

Description

Structure of engine mount {Structure of engine-mount}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an engine mount mounted on a vehicle body for supporting a load of the engine and attenuating vibrations. More particularly, the present invention relates to an engine mount structure capable of improving damping performance, .

In order to insulate and attenuate the vibration of the engine, the engine of the vehicle is installed in the engine room of the vehicle body through the engine mount. In the passenger car, the rubber mount which insulates and attenuates the vibration through the elastic force of the rubber and the hydro- A constructed hydro engine mount (fluid-sealed engine mount) is widely used.

The hydro engine mount has a structure in which a predetermined amount of liquid is enclosed therein to damp vibration in accordance with the flow of the liquid. Since the hydro engine mount has the effect of simultaneously attenuating vibrations in a high frequency region and a low frequency region, Is increasing.

1, the conventional hydro engine mount has an insulator 3 of an elastic material coupled to the upper side of the inner case 5 and a diaphragm 8 connected to the lower side of the inner case 5. The insulator 3, The nozzle plate 6 is fixedly mounted on the inner case 5 between the upper and lower liquid chambers 8 and 8 and the inner space is partitioned into the upper liquid chamber and the lower liquid chamber.

The nozzle plate 6 is composed of an upper plate and a lower plate coupled to each other. In the center of the lower plate, a disk-shaped membrane 7 is seated to form a hole to be exposed to the lower liquid chamber, and a lower portion of the channel is formed along the outer circumference of the hole An annular channel groove is formed. On the lower plate, a hole is formed so that the upper surface of the membrane 7 is exposed to the upper liquid chamber, and an upper plate covering the flow path groove is seated. (Not shown) are formed in the upper plate and the lower plate, respectively, to form a flow path for communicating the upper liquid chamber and the lower liquid chamber.

On the other hand, when the insulator 3 is elastically deformed by the load movement and vibration transmitted from the engine through the core 2 coupled with the bolts 1 engaged with the engine, As well.

In this case, when the urine absorbs the liquid, the fluid does not pass through the flow path through the flow path due to the fluid inertia of the liquid, and flows into the gap where the membrane 7 is engaged. .

However, in such a conventional structure, in the portion where the membrane 7 is engaged, the flow rate of the rats (when the negative pressure in the upper liquid chamber increases, the flow rate increases between the membranes and the membranes vigorously vibrate) or cavitation (bubbles A phenomenon of explosion of the battery) occurs. In addition, since the nozzle plate 6 is a fixed body that is not elastically deformed, there is a problem that vibrations are transmitted to the vehicle body through the bracket 4 without cavitation when cavitation occurs.

In addition, the pressure inside the lower liquid chamber increases during the flow of the liquid, resulting in a problem that the durability of the diaphragm 8 deteriorates. That is, the diaphragm 8 constituting the lower liquid chamber is swollen like a balloon when the pressure of the lower liquid chamber is increased. When the pressure is lowered, the diaphragm 8 is repeatedly rotated to cause breakage or deformation due to accumulation of fatigue.

Further, as the pumping area varies depending on the shape and / or hardness of the insulator 3, the entire damping frequency is changed during the tuning of the insulator 3, so that the tuning is not easy.

Accordingly, it is an object of the present invention to provide a structure of an engine mount capable of solving the problems of the conventional structure in which noise caused by internal rattle and cavitation is transmitted to the outside of the engine mount and durability of the diaphragm deteriorates The main purpose is.

In order to achieve the above object, according to the present invention, there is provided a structure of an engine mount in which an interior is divided into an upper liquid chamber and a lower liquid chamber by a nozzle plate and liquid flows through an upper liquid chamber and a lower liquid chamber through a flow path formed in the nozzle plate An insulator which is coupled to a core connected to the engine and is elastically deformed according to changes in vibration and load transmitted to the core; an inner case coupled to a lower portion of the insulator; A lower cup forming a liquid chamber in the chamber; And a nozzle plate coupled to the inner case through a membrane so as to partition the liquid chamber into an upper liquid chamber and a lower liquid chamber and having a flow path for communicating the upper liquid chamber and the lower liquid chamber, the membrane being made of a material capable of being elastically deformable , And the nozzle plate is directly connected to the core and moves together with the core.

The membrane is formed in a ring shape in which the nozzle plate is fitted inside, the inner periphery is coupled along the periphery of the nozzle plate, the outer periphery is coupled with the coupling ring, and the coupling ring is fixed to the inner case.

The upper plate and the lower plate are coupled to each other. An upper liquid chamber and an opened upper hole are formed on an upper surface of the upper plate, and a lower liquid chamber and a lower hole are formed on a lower surface of the lower plate. And is formed in the shape of a spiral that rotates along the circumference of the nozzle plate.

The bottom of the core is coupled to expose the upper liquid chamber, and a screw hole is formed in a lower surface of the core. A fixing bolt penetrating the nozzle plate is fastened to the screw hole to directly connect the nozzle plate and the core.

The lower cup is made of a material that does not cause elastic deformation when the liquid flows, and the sealing material is coated on the surface facing the lower liquid chamber.

According to the engine mount of the present invention having the above-described structure, as the nozzle plate and the core move together, the liquid moves due to the vibration input to the core (vibration applied to the core directly acts as a force for moving the liquid ) By resonance, the damping effect can be increased by acting simultaneously with the friction damping by the met damping and the friction.

The joint caused by the cavitation and the rattle generated in the nozzle plate is insulated by the membrane, so that the generation of the joint can be suppressed.

In addition, the nozzle plate itself has a plunger function (refer to 'Fluid-sealing type engine mount' in Japanese Patent Application Laid-Open No. 10-2011-0053634 [May 25, 2011] It is possible to further improve the high-frequency dynamic characteristics.

In the present invention, instead of the diaphragm in which elastic deformation occurs during liquid flow, a lower cup, which is not elastically deformed, is mounted, thereby reducing the production cost, weight, and durability.

1 is a view showing a state in which a conventional engine mount is cut in a longitudinal direction,
FIGS. 2 and 3 illustrate a longitudinally sectioned engine mount according to a preferred embodiment of the present invention,
FIG. 4 is a view illustrating a process of assembling an engine mount according to a preferred embodiment of the present invention,

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings in order that the present invention can be easily carried out by those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

In addition, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings, and the inventor should properly define the concept of the term to describe its invention in the best way. It should be construed as meaning and concept consistent with the technical idea of the present invention.

The present invention relates to a hydro engine mount which is damped as the liquid flows in the upper liquid chamber and the lower liquid chamber through the flow path formed in the nozzle plate (30) by the nozzle plate (30) With reference to the structure, a preferred embodiment of the present invention will be described in more detail below with reference to the drawings.

The nozzle plate 30 is mounted between the insulator 20 and the lower cup 60 and the nozzle plate 30 is directly connected to the core 10 connected to the engine through the fixing bolt 50, The nozzle plate 30 itself is vertically moved.

2 and 3, the insulator 20 is coupled with the core 10 connected to the engine through the bolts 11 and is elastically deformed according to changes in vibration and load transmitted to the core 10, The inner case 40 is engaged. The lower cup 60 is coupled to the lower end of the inner case 40 to form a liquid chamber in which a predetermined amount of liquid is stored between the lower cup 60 and the insulator 20.

The nozzle plate 30 is coupled to the inner case 40 between the insulator 20 and the lower cup 60 through a ring-shaped membrane 70 to divide the liquid chamber into an upper liquid chamber and a lower liquid chamber.

The nozzle plate 30 includes a lower plate 30b formed with a lower liquid chamber and a lower hole 30b formed therein and an upper plate 30b connected to the upper liquid chamber, (See FIG. 4), and a flow path through which the liquid flows is formed inside. The flow path is formed in a spiral shape (since the flow path is formed at a position where the membrane of the present invention is conventionally mounted, but is formed at a position closer to the center in the present invention), the flow path is rotated by at least one- (See the arrows in Fig. 3).

The inner peripheral surface (inner peripheral surface) of the membrane 70 having a ring shape is fitted in the lower plate 30b of the nozzle plate 30. The outer peripheral surface of the membrane 70 is connected to the inner surface of the inner And is fixed to the case 40.

In the present invention, the core (10) coupled with the insulator (20) is coupled to expose the upper liquid chamber at the lower end, and a screw hole (12) is formed at the lower surface. A fixing bolt 50 passing through the nozzle plate 30 is fastened to the screw hole 12 and is directly coupled to the nozzle plate 30 and the core 10.

Since the membrane 70 is made of a rubber material and elastically deformable, the nozzle plate 30 can be vertically moved together with the core 10.

In the present invention, the lower cup 60 is made of a material which does not cause elastic deformation when the liquid flows, in order to prevent the fatigue caused by the repeated elastic deformation from occurring. A sealing agent 61 is applied to a surface of the lower cup 60 facing the lower liquid chamber.

The engine mount of the present invention having the above-described configuration is assembled in the order as shown in FIG.

The rubber material is vulcanized to form the insulator 20 while the bolts 11, the core 10 and the inner case 40 are inserted into the mold. At this time, the nozzle plate 30 is manufactured separately. The upper plate 30a and the lower plate 30b are separately manufactured in the nozzle plate 30 and the lower plate 30b is vulcanized with the rubber material inserted into the mold together with the fastening ring 71, Or the lower plate 30b, the membrane 70 and the fastening ring 71 are separately manufactured and then bonded using an adhesive or the like.

The nozzle plate 30 is coupled to the inner case 40 in a state where the membrane 70 and the fastening ring 71 are engaged. The fixing bolt 50 penetrating the nozzle plate 30 is engaged with the threaded hole 12 of the core 10 so that the fixing bolt 50 is inserted into the screw hole 12 of the core 10, Respectively.

Subsequently, a lower cup 60 is additionally mounted at the lower end of the inner case 40, and a predetermined amount of fluid is injected into the liquid chamber. Finally, the assembly of the engine mount according to the embodiment of the present invention is completed by engaging with the bracket 80 fixed to the vehicle body.

In the engine mount of the present invention having the above-described structure, since the lower cup 60, which is not elastically deformed, is mounted in place of the diaphragm in which elastic deformation occurs during liquid flow, the production cost and weight can be lowered and the durability can be increased. The nozzle plate 30 behaves like the nose 10 according to the vibration of the nozzle plate 30, and the nozzle plate 30 behaves like the conventional plunger, so that high frequency dynamic characteristics can be improved.

In addition, since the rattles generated in the nozzle plate 30 and the joints caused by the cavitation are insulated by the membrane 70, it is possible to suppress the generation of the joints transmitted to the vehicle body.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Will be apparent to those of ordinary skill in the art.

10: Core
11: Bolt
20: Insulator
30: nozzle plate
40: inner case
50: Fixing bolt
60: Lower cup
70: Membrane
80: Bracket

Claims (5)

In which the inside is divided into an upper liquid chamber and a lower liquid chamber by a nozzle plate and liquid flows through the upper liquid chamber and the lower liquid chamber through a flow path formed in the nozzle plate,
An insulator coupled to a core connected to the engine and elastically deformed according to a change in vibration and load transmitted to the core;
An inner case coupled to a lower portion of the insulator;
A lower cup coupled to a lower end of the inner case to form a liquid chamber with the insulator; And
And a nozzle plate coupled to the inner case through the membrane so as to partition the liquid chamber into an upper liquid chamber and a lower liquid chamber and having a flow passage for opening the upper liquid chamber and the lower liquid chamber,
Wherein the membrane is made of a material that is elastically deformable and the nozzle plate is directly coupled to the core to act with the core.
2. The apparatus of claim 1, wherein the membrane is formed in a ring shape in which the nozzle plate is fitted inside, the inner circumference is coupled along the circumference of the nozzle plate, the outer circumference is coupled with the concave ring, Features of the engine mount.
[2] The apparatus according to claim 1, wherein the nozzle plate has an upper liquid chamber and an opened upper hole formed on an upper surface thereof, and a lower liquid chamber and an opened lower hole formed on a lower surface thereof,
Wherein the flow path is formed so as to open the upper hole and the lower hole, and is formed in a spiral shape that rotates along the circumference of the nozzle plate.
[2] The apparatus of claim 1, wherein the core has a lower end coupled to the upper liquid chamber,
And a fastening bolt passing through the nozzle plate is fastened to the screw hole to directly connect the nozzle plate and the core.
The engine mount according to any one of claims 1 to 4, wherein the lower cup is made of a material that does not cause elastic deformation when the liquid flows, and the sealing material is applied to the surface facing the lower liquid chamber .

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