KR20220045395A - Hydraulic mount for vehicle - Google Patents

Abstract

The present invention provides a fluid enclosed mount for a vehicle, which has a deformation guide groove in a membrane to enable the membrane to be easily deformed in a compression direction due to the deformation guide groove when the membrane is excited and compressed, thereby restraining a phenomenon that an outer end part of the membrane collides with a surface of a movement gap to prevent a joint. Moreover, a stopper capable of coming in contact with the membrane is mounted in an orifice body to enable the stopper to perform stopping for supporting the bottom portion of the membrane when the membrane is excited and compressed with large displacement, thereby preventing deformation of the membrane to increase durability of the membrane.

Description

Fluid Enclosed Mount for Vehicles {HYDRAULIC MOUNT FOR VEHICLE}

The present invention relates to a fluid-filled mount for automobiles, and more particularly, to a fluid-filled mount for automobiles using a membrane having a cross groove and a stopper supporting it to prevent noise from occurring.

In general, when a power train including an engine and a transmission of a vehicle is mounted in an engine room, it is mounted by an engine mount and a transmission mount in order to effectively reduce vibration and noise transmitted to a vehicle body.

As the mount, a fluid-filled mount in which a fluid is encapsulated at the bottom of an insulator made of rubber is applied. It is manufactured with a structure that can be used and is widely used in various car types.

Here, referring to FIGS. 1 and 2 attached to a conventional fluid-enclosed mount, it is as follows.

1 and 2, reference numeral 10 denotes a bolt connected to the engine.

The bolt 10 is coupled to the core bush 12 , and a main rubber 14 is formed on the outer diameter of the core bush 12 by vulcanization or the like.

In addition, an orifice body 20 in which an upper plate 16 and a lower plate 18 are coupled to each other is disposed under the main rubber 14, and a diaphragm 28 is mounted under the orifice body 20 .

At this time, the lower plate 18 has a ring in which a flow path 18-1, which is a first orifice having a concave structure, is formed on the upper surface portion, and a lower entrance 18-2 is formed at a predetermined position of the flow path 18-1. The upper plate 16 is made of a ring-shaped plate having an upper entrance 16-1, and is coupled to cover the flow path 18-1 of the lower plate 18.

In particular, a rubber membrane 26 that separates the upper fluid chamber 22 and the lower fluid chamber 24 is mounted at the center of the orifice body 20 .

Specifically, after the membrane 26 is disposed at the central opening of the orifice body 20 and the outer diameter portion of the membrane 26 is seated on the stepped portion 18-3 formed on the inner diameter portion of the lower plate 18, It is in a state covered by the inner peripheral end of the upper plate (16).

At this time, a flow gap 30 exists between the upper surface of the outer end of the membrane 26 and the upper plate 16 , and between the lower surface of the outer end of the membrane 26 and the lower plate 18 .

Therefore, when a large displacement vibration according to the rough road driving of the vehicle is input to the fluid-filled mount having the above configuration, the main rubber 14 is compressed as shown on the right side of FIG. By pressing 26, the flow gap 30 is closed, and at the same time, the fluid in the upper fluid chamber 22 flows through the upper entrance 16-1 formed in the upper plate 16 of the orifice body 20. After entering into the flow path 18-1 of the lower plate 18, it is filled into the lower fluid chamber 24 through the lower entrance 18-2 formed at a predetermined position of the flow path, and a high attenuation to buffer large displacement vibration occurs. is done

On the other hand, when idle vibration of a vehicle or micro-displacement vibration according to good road driving is input to the fluid-filled mount, the membrane 26 is slightly displaced to reduce idle vibration, etc. as shown on the left side of FIG. Because it is absorbed, the NVH (Noise, Vibration & Harshness) improvement effect can be obtained.

However, the conventional fluid-enclosed mount has the following problems.

3, when excitation occurs in the fluid-enclosed mount, the internal pressure of each fluid chamber changes and the membrane 26 is excited, and the membrane 26 is stretched and compressed according to the membrane excitation. There is a problem in that a rattle noise is generated as it hits the surface of the flow gap 30 (surfaces of the upper plate and the lower plate in contact with the outer ends of the membrane) while repeating.

In other words, when the membrane 26 is excited, it is displaced while repeating compression and tension as shown in the graph of FIG. There is a problem that rattle joints occur as they collide with the surface of the

That is, when a pressure is applied to the upper surface of the membrane 26 during compression, a joint is generated as the outer end of the membrane 26 collides with the surface of the stepped portion 18-3 of the lower plate 18, and vice versa. In the tensile direction in which the membrane 26 returns to the upward direction after compression, the pressure acting on the membrane is rapidly lowered, thereby causing a cavitation joint.

As a prior art for solving this problem, as shown in FIG. 5 , a cross-shaped slit hole 26-3 is formed through the central portion of the membrane 26, and the membrane 26 is damaged by vehicle vibration. And by allowing the fluid to move through the slit hole 26-3 when compression and tension are repeated, the phenomenon that the outer end of the membrane collides with the surface of the flow gap can be minimized to prevent the occurrence of noise. measures have been applied.

However, it is difficult to tune the flow of the membrane having the slit hole, and as the durability progresses, the slit hole spreads and burns out, making it difficult to realize the quality stabilization of the membrane.

The present invention has been devised to solve the above-mentioned problems in the prior art, and by forming a deformation inducing groove in the membrane so that the membrane is easily deformed in the compression direction due to the deformation inducing groove when the membrane is excited and compressed, The main purpose of the present invention is to provide a fluid-filled mount for automobiles that prevents the occurrence of noise by suppressing the phenomenon that the outer end of the valve collides with the surface of the flow gap.

In addition, the present invention is equipped with a stopper contactable with the membrane on the orifice body so that when the membrane is excited and compressed with a large displacement, the stopper supports the bottom of the membrane so that the stopper can be made, thereby preventing deformation of the membrane and making it durable It is another object to provide a fluid-filled mount for an automobile to improve the

In order to achieve the above object, the present invention provides: a core bush to which a bolt for connection with an engine is coupled, a main rubber formed on an outer surface of the core bush, and an orifice in which an upper plate and a lower plate form a flow path and are laminated to each other A fluid-filled mount for automobiles comprising: a sieve; a membrane mounted in a central portion of the orifice body to partition an upper fluid chamber and a lower fluid chamber; A first deformation guiding groove and a second deformation guiding groove are formed in the upper and lower surfaces, respectively, and a stopper is mounted on the lower plate of the orifice body to contact and support the bottom of the membrane when the membrane is compressed and deformed. Fluid-enclosed mounts are provided.

Preferably, the first deformation guiding groove and the second deformation guiding groove are characterized in that horizontal grooves and vertical grooves having a predetermined length and depth are formed in a cross-shaped arrangement in which they cross each other.

In addition, a plurality of stopper support bars for mounting the stopper are integrally formed on the inner circumferential surface of the lower plate.

In addition, it is characterized in that a fastening groove is formed on the circumferential surface of the stopper into which the inner end of the stopper support end is inserted and fastened.

Accordingly, when the membrane is excited and slightly displaced in the compression direction, it is characterized in that the membrane flows until it reaches the stopper due to the deformation of the first and second deformation guide grooves.

On the other hand, when the membrane is excited and displaced in the compression direction, it is characterized in that the membrane flows until it hits the stopper due to the deformation of the first and second deformation guide grooves.

More specifically, when the membrane is excited and displaced in the compression direction, the first deformation guiding groove is narrowed while the second deformation guiding groove is widened, and the second deformation guiding groove is opened as the second deformation guiding groove is opened. It is characterized in that the inlet edge portion of the two-deformation guide groove is stopped while making point contact or line contact with the upper surface of the stopper.

Through the means for solving the above problems, the present invention provides the following effects.

First, a deformation-inducing groove is formed in the membrane so that the membrane is easily deformed in the compression direction due to the deformation-inducing groove when the membrane is excited and compressed, thereby suppressing the phenomenon that the outer end of the membrane collides with the surface of the flow gap. It is possible to prevent the occurrence of noise.

Second, by mounting a stopper in contact with the membrane on the orifice body, when the membrane is excited and compressed with a large displacement, the stopper supports the bottom of the membrane, thereby preventing deformation of the membrane and improving durability. can

Third, when the membrane is stretched, the pressure change can be absorbed by the strain-inducing groove, thereby suppressing cavitational noise generated during the existing membrane tensioning.

1 is a partial cross-sectional perspective view of a conventional fluid-filled mount;
2 is a cross-sectional view showing a conventional fluid-filled mount,
3 and 4 are views for explaining the problems of the conventional fluid-filled mount,
5 is a perspective view showing that a slit hole is formed in the membrane in the configuration of the conventional fluid-filled mount;
6 and 7 are perspective views showing a state in which the membrane of the fluid-filled mount according to the present invention is mounted on the orifice body;
8 is a cross-sectional perspective view showing a half-sectioned state of the membrane and the stopper mounted on the orifice body of the fluid-filled mount according to the present invention;
9 is a cross-sectional view of a membrane mounted on an orifice body of a fluid-filled mount according to the present invention in a longitudinal direction of a deformation inducing groove;
10 is a cross-sectional sectional view of a membrane and a stopper mounted on an orifice body of a fluid-filled mount according to the present invention along an offset portion in the longitudinal direction of a deformation inducing groove;
11 is a cross-sectional view showing a state in which the membrane mounted on the orifice body of the fluid-filled mount according to the present invention stops the stopper;
12 and 13 are graphs comparing the damping force between a membrane having a deformation inducing groove of a fluid-filled mount according to the present invention and a membrane having a conventional slit hole.

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

As described above with reference to FIGS. 1 and 2 , the fluid-filled mount of the present invention includes a core bush 12 to which a bolt 10 is coupled, and a vulcanization bonding method to the outer diameter of the core bush 12 . The main rubber 14 formed of , which divides the upper fluid chamber 22 and the lower fluid chamber 24 , and includes a membrane 26 mounted on the central portion of the orifice body 20 .

6 to 8 show a state in which the membrane of the fluid-filled mount according to the present invention is mounted on the orifice body.

According to the present invention, in the central region of the membrane 26, a first deformation guiding groove 26-1 and a second deformation guiding groove 26-2 are respectively formed on an upper surface portion and a lower surface portion thereof, and the orifice body At the lower plate 18 of ( 20 ), a stopper ( 40 ) with which the bottom of the membrane ( 26 ) is contacted and supported during compression deformation of the membrane ( 26 ) is mounted.

Preferably, the first deformation guide groove 26-1 and the second deformation guide groove 26-2 facilitate deformation in the compression direction (downward direction toward the lower fluid chamber) when the membrane is excited. For this purpose, transverse grooves and vertical grooves having a predetermined length and depth are formed in a cross-shaped arrangement crossed with each other.

In order to mount the stopper 40 to the lower plate 18 of the orifice body 20 , a plurality of stopper support bars 19 extend inwardly and are integrally formed on the inner circumferential surface of the lower plate 18 .

Preferably, the plurality of stopper support bars 19 are arranged in a radial arrangement, that is, at equal intervals along the circumferential direction, because the fluid flows smoothly through the hole space between each stopper support bar 19 at the same time. The purpose is to allow the fluid pressure on the bottom surface of the membrane 26 to smoothly act.

More preferably, the plurality of stopper support bars 19 include an inclined section 19-1 extending downwardly from the inner circumferential surface of the lower plate 18 and the inclined section, as can be seen in FIGS. 9 and 10 . It consists of a horizontal extension section 19-2 extending from 19-1 to the periphery of the stopper 40, and the reason is that the vertical distance between the stopper support bar 19 and the membrane 26 is a distance that can avoid interference. This is to easily secure a space for up-and-down flow of the membrane 26 by fluid pressure while maintaining it.

In addition, a fastening groove 42 into which the inner end of the stopper support end 19, that is, the inner end of the horizontal extension section 19-2, is inserted and fastened is formed on the circumferential surface of the stopper 40.

Accordingly, when the stopper 40 is press-fitted through an open portion formed at the inner end of each stopper support end 19 in a force fit method, the inner end of the stopper support end 19 is inserted into the fastening groove 42 . By being inserted, the mounting of the stopper 40 to the stopper support end 19 can be easily achieved.

As the stopper 40 is mounted on the stopper support end 19 in this way, the lower surface portion of the membrane 26 in which the second deformation guide groove 26-2 is formed is separated from the upper surface portion of the stopper 40 by a predetermined distance. Maintain and match up and down.

In more detail, as shown in the cross-sectional views of FIGS. 9 and 10 , the first and second deformation guiding grooves 26-1 and 26-2 of the membrane 26 are aligned vertically. arranged, and the second deformation guide groove 26 - 2 of the membrane 26 is in a state in which the upper surface of the stopper 40 and the upper surface are vertically aligned.

At this time, as shown in FIG. 9 , the thickness of the portion where the first and second deformation guide grooves 26 - 1 and 26 - 2 are formed is thinner than the original thickness of the membrane 26 . The vertical deformation of the membrane 26 can be easily induced during the vertical excitation.

Here, the operating state of the fluid-filled mount of the present invention configured as described above will be described as follows.

When the vehicle's idle vibration or micro-displacement vibration due to good road driving is input to the fluid-filled mount, the membrane 26 moves down (compression direction) and up (tension direction) by micro-displacement (e.g., 0.5 ~1mm up and down excitation).

That is, the membrane 27 absorbs vibrations while making a micro-displaced flow due to the repeated deformation of the first and second deformation inducing grooves 26-1 and 26-1 and 26-2, thereby absorbing noise (NVH). , Vibration & Harshness) can be improved.

At this time, when the membrane 26 moves up and down according to the micro displacement of the membrane 26 , only the bottom part of the membrane 26 flows until it touches the stopper 40 , and the bottom part of the membrane 26 is the stopper 40 . does not come into contact with

On the other hand, when a large displacement vibration, etc. according to the rough road driving of the vehicle is input to the fluid-filled mount, the membrane 26 is excited and displaced in the compression direction by the fluid pressure at the same time.

At this time, due to the deformation of the first and second deformation guide grooves 26 - 1 and 26 - 2 , the membrane 26 flows until it touches the stopper 40 .

More specifically, when the membrane 26 is excited and displaced in the compression direction, the first deformation inducing groove 26-1 is narrowed and the second deformation inducing groove 26-2 is widened. and, as shown in FIG. 11 , as the second deformation inducing groove 26-2 is opened, the inlet edge of the second deformation inducing groove 26-2 is in point contact with the upper surface of the stopper 40 Alternatively, it is in a state of stopping while making line contact.

Accordingly, the stopper 40 limits the increase in the amount of deformation in the compression direction of the membrane 26 beyond a predetermined level, and furthermore, the amount of deformation of the first and second deformation guide grooves 26-1 and 26-2 is predetermined. Since the stopper 40 suppresses the increase above the level, it is possible to prevent the first and second deformation guide grooves 26-1 and 26-2 of the membrane 26 from being damaged, and eventually the membrane ( 26) can improve the durability.

In addition, when the membrane 26 is displaced in the tensile direction, the pressure change is absorbed while the first and second deformation inducing grooves 26-1 and 26-2 return to their original shapes. Cavitation joint can be suppressed.

On the other hand, a damping force comparison test was conducted for the conventional mount (application of a membrane through which a cross-shaped slit hole is formed as shown in FIG. 5) and the mount of the present invention (application of a membrane with a cross-shaped deformation inducing groove and a stopper). The results are as shown in the accompanying graphs of FIGS. 12 and 13 .

Referring to FIG. 12 , it was found that the damping force of the conventional mount (application of a membrane having a cross-shaped slit hole through it) is somewhat higher during micro-displacement (0.5-1.0 mm) than the mount of the present invention (application of a membrane having a cross-shaped deformation inducing groove). Could know.

Referring to FIG. 13, compared to the conventional mount (application of a membrane having a cross-shaped slit hole formed therethrough), the mount of the present invention (application of a membrane having a cross-shaped deformation inducing groove) has significantly higher damping force during large displacement (3.0 to 5.0 mm). This is due to the fact that, when the membrane 26 is compressively deformed, the stopper 40 is supported in contact with the bottom surface of the membrane 26 to prevent further deformation of the membrane.

As seen above, by forming the deformation inducing grooves 26-1 and 26-2 in the membrane 26, when the membrane 26 is excited and compressed, the deformation inducing grooves 26-1 and 26-2 are formed. Due to this, by allowing the membrane 26 to be easily deformed in the compression direction, the phenomenon that the outer end of the membrane 26 collides with the surface of the flow gap 30 can be suppressed to prevent the occurrence of noise, and in particular, the orifice body 20 ), by mounting a stopper 40 contactable with the membrane 26 on the lower plate 18 of the By allowing the stopping to be made, it is possible to prevent deformation of the membrane and improve durability.

10: bolt 12: core bush
14: main rubber 16: upper plate
16-1: upper entrance 18: lower plate
18-1: Euro 18-2: Lower entrance
18-3: step part 19: stopper support end
19-1: slope section 19-2: horizontal extension section
20: orifice body 22: upper fluid chamber
24: lower fluid chamber 26: membrane
26-1: first deformation guide groove 26-2: second deformation guide groove
28: diaphragm 30: flow gap
40: stopper 42: fastening groove

Claims (9)

A core bush to which a bolt for connection with an engine is coupled, a main rubber formed on the outer surface of the core bush, an orifice body in which an upper plate and a lower plate form a flow path and are laminated to each other, and is mounted in the center of the orifice body A fluid-filled mount for automobiles comprising: a membrane partitioning an upper fluid chamber and a lower fluid chamber; and a diaphragm closing the lower fluid chamber;
In the central region of the membrane, first and second deformation guiding grooves are respectively formed on the upper and lower surfaces thereof, and a stopper is mounted on the lower plate of the orifice body to contact and support the bottom of the membrane during compression deformation of the membrane. Fluid-filled mount for automobiles, characterized in that it has been
The method according to claim 1,
The first deformation guiding groove and the second deformation guiding groove are fluid-filled mounts for automobiles, characterized in that they are formed in a cross-shaped arrangement in which horizontal grooves and vertical grooves having a predetermined length and depth are crossed with each other.
The method according to claim 1,
A plurality of stopper support bars for mounting the stopper are integrally formed on an inner circumferential surface of the lower plate in a radial arrangement.
4. The method according to claim 3,
Each of the plurality of stopper support bars includes an inclined section extending downwardly from the inner circumferential surface of the lower plate, and a horizontal extension section extending from the inclined section to the periphery of the stopper.
4. The method according to claim 3,
A fluid-filled mount for automobiles, characterized in that a fastening groove into which an inner end of the stopper support end is inserted and fastened is formed on a circumferential surface of the stopper.
The method according to claim 1,
When the membrane is excited and slightly displaced in the compression and tension directions, the membrane flows until it reaches the stopper due to the deformation of the first and second deformation guide grooves.
The method according to claim 1,
When the membrane is excited and displaced in the compression direction, the membrane flows until it reaches the stopper due to deformation of the first and second deformation guide grooves.
8. The method of claim 7,
When the membrane is excited and displaced in the compression direction, the first deformation guide groove is narrowed and the second deformation guide groove is widened at the same time.
8. The method of claim 7,
When the membrane is excited and displaced in the compression direction, the second deformation guiding groove is widened and the inlet edge of the second deformation guiding groove is stopped by point contact or line contact with the upper surface of the stopper. Automotive fluid-filled mounts.

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