KR102169368B1 - Engine-mount - Google Patents

Abstract

In the present invention, a nozzle plate is mounted between the insulator and the diaphragm in the case, and the inside is divided into an upper liquid chamber and a lower liquid chamber, and the hydro liquid sealed according to the volume change inside the upper liquid chamber and the lower liquid chamber through a flow path formed in the nozzle plate. In the engine mount that flows, the lower case is coupled to form a space between the bottom of the case; And a second insulator mounted between the case and the lower case to form a first chamber into which fluid can be sealed and made of a material having elasticity, wherein the second insulator is located under the first chamber in the lower case. 2 chambers are provided, and the first chamber and the second chamber are opened through the flow path hole, and a valve plate for controlling the opening and closing of the flow path hole according to the change in the internal pressure of the first chamber due to the elastic deformation of the second insulator is mounted. do.
The engine mount of the present invention has better vibration damping performance and lower dynamic characteristics than a conventional fluid-sealed engine mount that does not have an actuator because the damping characteristics of the engine mount are self-variable according to the magnitude of the input vibration, such as an active mount.

Description

Engine-mount

The present invention relates to an engine mount mounted to support a load while attenuating the vibration generated from the engine, and more specifically, the height of the engine mount is lowered according to the amplitude input during driving, thereby lowering the center of gravity during driving, thereby reducing the damping performance and support. It relates to an engine mount having a self-conversion characteristic so that it can be increased.

The engine of the vehicle is installed in the engine compartment of the vehicle body through the engine mount to attenuate the vibration of the engine. The engine mount applied to a passenger vehicle is a rubber mount that insulates and attenuates vibrations through the elastic force of the rubber, and a fluid-sealed mount (hydro mount) configured to enclose a predetermined amount of hydro liquid are generally widely used.

Of these, the fluid-sealed mount has a structure that attenuates vibrations according to the flow of the hydro liquid by encapsulating a predetermined amount of hydro liquid inside, but has the effect of simultaneously attenuating the vibrations in the high and low frequency regions. Therefore, the application range is gradually increasing. However, when the fluid-enclosed mount is manufactured, the loss factor (damping) increases when the amount of hydro liquid enclosed increases, but the dynamic characteristics increase and the NVH (noise, vibration, harshness) performance decreases. NVH performance improved, but there was a problem that the loss factor decreased.

Accordingly, an active mount capable of actively controlling attenuation characteristics has been developed so as to more efficiently attenuate vibrations in a specific frequency range in a fluid-sealed mount.

The active mount is configured to control the dynamic characteristics of the mount in an on/off manner. Referring to FIG. 1 to describe a conventional active mount, an insulator 2 made of an elastic material coupled to a core 1 is mounted on the upper side of the case, and a diaphragm 4 is coupled to the lower part, the insulator 2 ) And the diaphragm 4, a nozzle plate 3 is mounted, and the inner space is divided into an upper liquid chamber and a lower liquid chamber.

The nozzle plate 3 is configured such that an annular flow path is formed therein along the circumference so that the enclosed hydro liquid can flow through the upper and lower liquid chambers. When the insulator 2 coupled with the core 1 is elastically deformed by the load movement and vibration transmitted from the engine, the flow of the hydro liquid is achieved as the internal volume of the upper liquid chamber increases or decreases.

In addition, a second flow path for additionally opening the upper and lower liquid chambers in the vertical direction is provided in the center of the nozzle plate 3, and the upper end of the second flow path is connected to the diaphragm 4 to rise and fall. (5) is placed. The rod 5 is coupled with a spring (not shown) to provide an elastic force in a direction (ascending direction) to shield the second flow path, and the coil 6 is disposed in close proximity. In addition, when power is applied to the coil 6, the rod 5 descends by the electromagnetic force, and the second flow passage additionally opens the upper and lower liquid chambers.

However, since the active mount has a structure in which a actuator (including a rod, spring, coil, power supply device, etc.) is additionally mounted on a fluid-sealed mount, not only the production cost and weight increase due to the additional installation of the actuator, but consumption. There was a problem that the current was also increased and could adversely affect fuel economy.

Accordingly, the present invention provides a fluid-enclosed engine mount capable of further improving damping performance and NVH performance by self-variable (self-converting) flow characteristics according to vibration characteristics input for each driving condition without additional installation of a actuator. The main purpose is to do.

That is, in the conventional fluid-filled engine mount, the characteristics of the mount are set to be low in order to improve vibration during idling according to the characteristics of the vehicle, or to generate a large loss factor (the characteristics of the mount are high) to improve driving performance. However, it was difficult to satisfy both because the vibration damping performance during idling and the performance of suppressing the rolling of the engine during driving are in inverse proportion to each other.

In order to solve this problem, in the present invention, the amplitude of the vibration input to the engine mount is small when the vehicle is idling (without installing a separate actuator such as an active mount), and the amplitude of the input vibration is large when driving. It is intended to provide an engine mount that maintains a low characteristic when a small amplitude is input, but lowers the center of gravity only when a large amplitude is input, thereby increasing the characteristic (and loss factor).

In more detail, as shown in FIG. 2, in the present invention, a secondary liquid chamber composed of a first chamber and a second chamber is added under the first liquid chamber composed of an upper liquid chamber and a lower liquid chamber, but the first chamber and the second chamber Is configured to lower the center of gravity by controlling the flow by opening and closing the valve plate 40.

In the engine mount according to the present invention, when a large amplitude is input (when driving), the valve plate 40 is opened and the hydro liquid flows from the first chamber to the second chamber, and the entire primary liquid chamber (both the upper part of the case) descends. , When a small amplitude is input (during idle), the hydro fluid is restored to its original height through the custom tube while the valve plate 40 is closed.

In the present invention for achieving the above object, the nozzle plate is mounted between the insulator and the diaphragm in the case, and the inside is divided into an upper liquid chamber and a lower liquid chamber, and the hydro liquid enclosed according to the volume change inside the nozzle plate An engine mount for flowing an upper liquid chamber and a lower liquid chamber through a formed flow path, the engine mount comprising: a lower case coupled to form a space under the case; And a second insulator mounted between the case and the lower case to form a first chamber into which fluid can be sealed and made of a material having elasticity, wherein the second insulator is located under the first chamber in the lower case. 2 chambers are provided, and the first chamber and the second chamber are opened through the flow path hole, and a valve plate for controlling the opening and closing of the flow path hole according to the change in the internal pressure of the first chamber due to the elastic deformation of the second insulator is mounted. do.

And, (as the internal pressure of the first chamber is lowered than the internal pressure of the second chamber due to the restoration of the second insulator), the lower end of the flow path hole allows the fluid flowing into the second chamber to return to the first chamber. A fine tube is formed on the surface that allows fine fluid flow even when the valve plate is closed.

When the valve plate closes the flow path hole, the valve plate elastically deforms so that the flow path hole is opened when the internal pressure of the first chamber increases.

In addition, a second diaphragm capable of elastic deformation according to a change in internal pressure is coupled to the lower case to form a part of the wall surface of the second chamber.

The fluid sealed in the first and second chambers is a hydro fluid having the same physical properties as the hydro fluid sealed between the insulator and the diaphragm.

The valve plate is located on the side of the second chamber and is mounted to shield the lower end of the flow path hole, and the rim portion is constrained to the fastening portion protruding from the lower case.

In addition, the valve plate has a perforated hole that is closed when the valve plate is in close contact with the lower case and is opened when the valve plate is elastically deformed. When the valve plate is elastically deformed, the perforated hole is opened with the flow path hole so that the fluid flows between the first chamber and the first chamber. It flows through the second chamber.

In an embodiment of the present invention, the valve plate is formed with a center portion having an upper end entering the lower end of the flow path hole to block the flow path hole, and the valve plate elastically deforms so that the center portion is spaced apart from the flow path hole.

The center portion is formed such that an upper end has a truncated cone shape, and the lower end of the flow path hole is formed in a shape whose diameter increases toward the lower end so that a part of the upper end of the center portion can enter.

In addition, the center portion is formed in the center of the valve plate, and a plurality of perforated holes are formed along the circumference of the valve plate to be spaced apart from each other.

The present invention having the configuration as described above is configured to have a secondary liquid chamber composed of a first chamber and a second chamber, so that when a large vibration enters, the fluid flows so that the center of gravity decreases, thereby improving driving performance. Accordingly, dynamic characteristics are also improved, and vibrations generated during driving can also be improved more efficiently.

In addition, when idling after running, the valve plate is closed due to low vibration characteristics and the fluid is restored through the tubules, thereby improving vibration damping performance during idling.

That is, since the engine mount of the present invention is configured to be separately optimized for both dynamic characteristics and loss factor parts, it is possible to increase both vibration damping efficiency when driving when idle (especially, the pumping area in the primary liquid chamber is maximized. Can effectively increase the damping performance)

In addition, since the secondary liquid chamber is connected in series under the primary liquid chamber, it has a double insulation effect, so that the NVH performance can be further improved.

1 is a view showing a conventional active engine mount cut in the longitudinal direction;
2 is a simplified diagram showing the interior of the engine mount to explain the main concept of the present invention;
3 is a view showing an engine mount cut in a longitudinal direction according to a preferred embodiment of the present invention;
4 is a view showing a state in which the valve plate closed the flow path hole;
5 is a view showing a state in which the valve plate opens the flow path hole;
6 is a view showing a comparison of an open state and a closed state of the flow path hole.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein.

In order to clearly describe the present invention, parts irrelevant to the description have been omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

In addition, terms or words used in the present specification and claims should not be construed as being limited to their usual or dictionary meanings, and the inventor appropriately defines the concept of terms in order to describe his own invention in the best way. It should be interpreted as a meaning and concept consistent with the technical idea of the present invention based on the principle that it can be done.

As shown in Fig. 3, the engine mount of the present invention is equipped with a nozzle plate 12 between the insulator 13 and the diaphragm 11 in the case 10 as in the conventional structure, so that the inside is It is divided into a lower liquid chamber, and is configured to flow the upper liquid chamber and the lower liquid chamber through a flow path formed in the nozzle plate 12, and the hydro liquid sealed according to the change in the internal volume, is provided in the lower part of the primary liquid chamber composed of the upper liquid chamber and the lower liquid chamber. It characterized in that a secondary liquid chamber consisting of one chamber and a second chamber is provided.

In the engine mount of the present invention, the valve plate 40 opens the channel hole 21 (the upper side is opened to the first chamber and the lower side is opened to the second chamber) only when a large vibration or a large load is input. By draining the fluid enclosed in the first chamber to the second chamber, the driving performance is improved as the overall height is lowered, and when the fluid is returned to the first chamber through the tubular tube 22 when idle, the vibration in the idle state is attenuated. It is configured to increase performance.

In the engine mount of the present invention, the lower case 20 is additionally coupled so that a space is formed under the case 10, and a first chamber in which a fluid can be sealed between the case 10 and the lower case 20 The second insulator 30 is mounted to form a. The second insulator 30 is made of a material having elasticity and is elastically deformed by a load transmitted from the case 10.

In addition, the lower case 20 is provided with a second chamber positioned below the first chamber, and the first chamber and the second chamber are configured to be opened through the flow path hole 21, and at the lower end of the flow path hole 21 A valve plate 40 for opening and closing the flow path hole 21 is mounted.

The valve plate 40 keeps the flow path hole 21 closed, but elastically deforms the flow path hole to be opened when the internal pressure of the first chamber increases. That is, when the internal pressure of the first chamber is increased by the elastic deformation of the second insulator 20 (caused by the input of a large amplitude vibration or load), the fluid enclosed in the first chamber presses the valve plate 40 It elastically deforms and flows into the second chamber.

In addition, the fluid flowing into the second chamber (with a large amplitude vibration or load stopped) can be returned to the first chamber (having an internal pressure relatively smaller than the internal pressure of the second chamber). At the lower end of the flow path hole 21, a fine tube 22 is formed on the surface of the valve plate 40 to allow the flow of a fine fluid even when the valve plate 40 is closed. In the exemplary embodiment of the present invention, as shown in FIGS. 4 and 5, a plurality of the custom tubes 22 are formed at the lower end of the flow path hole 21 to be spaced apart from each other along the circumference.

In addition, in order to induce a change in the volume inside the second chamber when the fluid flows, the lower case 20 includes a second diaphragm 50 capable of elastic deformation according to a change in internal pressure so as to form a part of the wall surface of the second chamber. Is combined.

In the present invention, the fluid sealed in the first chamber and the second chamber is preferably a hydro fluid having the same physical properties as the hydro fluid sealed between the insulator 13 and the diaphragm 11, but other liquids may be used. have.

The valve plate 40 is formed in the shape of a disk, but is a force-fitting method (in a state that is elastically compressed with a predetermined pressure) to the fastening part 23 that protrudes from the lower end of the flow path hole 21 to have a ring shape downward. It is concluded with. Accordingly, the edge portion of the valve plate 40 maintains a state in which the inner circumferential surface of the fastening portion 23 is pressed with a predetermined pressure and is restrained by the fastening portion 23.

In addition, the valve plate 40 is formed with a perforated hole 41 that is closed when the valve plate 40 is in close contact with the lower case 20 and is opened when the valve plate 40 is elastically deformed. That is, the perforated hole 41 is perforated at a position spaced apart from the flow path hole 21 to allow the flow of the fluid introduced into the flow path hole 21 only when the valve plate 40 is open.

In addition, a center portion 42 is formed on the valve plate 40 with an upper end entering the lower end of the flow path hole 21 to shield the flow path hole 21. In a preferred embodiment of the present invention (so that the flow path hole can be opened even if the valve plate has a small elastic deformation), the center portion 42 is formed to have a truncated cone shape at the top, and the The lower end of the flow path hole 21 is formed in a shape whose diameter increases toward the lower end so that a part of the upper end of the center portion 42 can enter. The center part 42 is formed in the center of the valve plate 40, and the perforated hole 41 is formed by being spaced apart from each other with the center part 42 at the center along the circumference of the valve plate 40 do.

The engine mount of the present invention having the configuration as described above can simultaneously obtain an effect obtained by lowering the center of gravity and an effect of improving driving performance by increasing a loss factor.

That is, when the large amplitude vibration transmitted from the road surface is input according to the driving of the vehicle, the valve plate 40 is opened and the fluid moves from the first chamber to the second chamber, as shown on the right in FIG. , The diaphragm, including all of the nozzle plate) the case 10 itself descends. Accordingly, the point where the engine and the engine mount are connected and the center of gravity of the engine are also lowered, the dynamic characteristics of the insulator 13 are improved, and the behavior of the engine is reduced (that is, by supporting the rolling of the engine more firmly), thereby improving the driving performance. It can be improved.

In addition, in the idle condition, since the amplitude of the incoming vibration is small, the valve plate 40 does not open, but the fluid through the tubular tube 22 returns from the second chamber to the first chamber, as shown on the left in FIG. 6. Accordingly, the case 10 itself (including all of the insulator, diaphragm, and nozzle plate) is restored to its original height, and the dynamic characteristics are lowered, thereby improving vibration damping performance at idle.

At this time, the principle of restoring from the second chamber to the first chamber is that when both the first chamber and the second chamber are filled with fluid and the second insulator 30 is compressed to descend while driving, the input of the large displacement vibration disappears. Since the volume of the first chamber is increased by the upward restoring force of the second insulator 30 (since the internal pressure of the first chamber is reduced than the internal pressure of the second chamber), the fluid is restored through the tubular tube 22.

On the other hand, in a fluid-sealed mount, one of the methods of increasing the loss factor proportional to the vibration damping performance is a method of increasing the pumping area. In the structure of the present invention, since the primary liquid chamber and the secondary liquid chamber are connected in series, the cross-sectional area of the core 14 is wider than that of the conventional structure, and the length of the insulator 13 is shortened to reduce the vertical motion. I can. At this time, the rest of the behavior can be set so that only a large loss factor occurs in the upper liquid chamber and the lower liquid chamber of the primary liquid chamber because the lower second insulator 30 is absorbable. Accordingly, at the same size, the engine mount of the present invention can further increase the vibration damping performance by maximizing the loss factor compared to the conventional structure.

Therefore, the engine mount of the present invention having the above technical characteristics is a structure in which a secondary liquid chamber is added compared to the conventional structure, so dynamic characteristics and support are improved as the center of gravity is lowered, thereby improving driving performance. Since it can be set to maximize the pumping area in the primary liquid chamber, the loss factor can also be maximized (the vibration damping performance can be optimized).

In the technical field to which the present invention pertains, the present invention described above is not limited by the above-described embodiments and the accompanying drawings, and that various substitutions, modifications and changes can be made within the scope of the technical spirit of the present invention. It will be obvious to those of ordinary skill.

10: case
20: lower case
21: Euro Hall
22: Customs
23: fastening part
30: second insulator
40: valve plate
41: Perforated hole
42: center part
50: second diaphragm

Claims (10)

An engine in which a nozzle plate is mounted between the insulator and the diaphragm in the case, and the inside is divided into an upper and lower liquid chamber, and the enclosed hydro liquid flows through the flow path formed in the nozzle plate according to the volume change inside the upper and lower liquid chambers. In the mount,
A lower case coupled to form a space between the bottom of the case; And
Includes; a second insulator mounted between the case and the lower case to form a first chamber into which a fluid can be sealed and made of a material having elasticity,
In the lower case, a second chamber located under the first chamber is provided, and the first chamber and the second chamber are opened through the flow path hole, and according to the change in the internal pressure of the first chamber due to the elastic deformation of the second insulator. Engine mount equipped with a valve plate that controls the opening and closing of the flow path.
The engine mount according to claim 1, wherein a fine tube is formed on the surface of the lower end of the flow path hole to allow the flow of fine fluid even when the valve plate is closed.
The engine mount according to claim 2, wherein when the internal pressure of the first chamber increases while the valve plate closes the flow path hole, the valve plate is elastically deformed to open the flow path hole.
4. The engine mount of claim 3, wherein a second diaphragm capable of elastic deformation according to a change in internal pressure is coupled to the lower case to form a part of the wall surface of the second chamber.
The engine mount of claim 4, wherein the fluid sealed in the first and second chambers is a hydro fluid having the same physical properties as the hydro fluid sealed between the insulator and the diaphragm.
The method according to any one of claims 1 to 5, wherein the valve plate is located on the side of the second chamber and is mounted to shield the lower end of the flow path hole, and the edge portion is constrained to the fastening portion protruding from the lower case. Engine mount.
The method of claim 6, wherein the valve plate has a perforated hole that is closed when the valve plate is in close contact with the lower case and is opened when the valve plate is elastically deformed, and when the valve plate is elastically deformed, the perforated hole is opened with the flow path hole to allow fluid to flow. An engine mount, characterized in that it flows through the first chamber and the second chamber.
[8] The engine mount of claim 7, wherein the valve plate has a center portion having an upper end entering the lower end of the flow path hole to shield the flow path hole, and the valve plate elastically deforms so that the center portion is spaced apart from the flow path hole.
The method of claim 8, wherein the center portion is formed to have a truncated cone shape at an upper end, and the lower end of the flow path hole is formed in a shape extending toward the lower end so that a portion of the upper end of the center portion can enter. Engine mount.
The engine mount according to claim 8, wherein the center portion is formed in the center of the valve plate, and a plurality of perforated holes are formed along the circumference of the valve plate to be spaced apart from each other.

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