KR102704659B1 - Hydraulic Busing for Vehicle with variable decoupler - Google Patents

Abstract

The present invention relates to a vehicle hydro bushing having a variable decoupler which, when vibration is attenuated through the decoupler, can have improved characteristics by achieving high attenuation in case of vibration with a large amplitude and having low dynamic stiffness in case of vibration with a small amplitude, and the hydro bushing including a core portion, a housing spaced apart from the core portion and surrounding a radially outer side of the core portion, and a vibration-isolating body provided between the core portion and the housing and having first passages formed to connect the plurality of liquid chambers to absorb low-frequency/high-amplitude vibrations, wherein: the vibration-isolating body includes a decoupler in which second passages formed to connect the plurality of liquid chambers to absorb high-frequency/low-amplitude vibrations; The above decoupler is characterized by including a membrane configured to block the second flow path when subjected to low-frequency/high-amplitude vibration, and a valve member that adjusts the flow cross-sectional area of the second flow path according to the hydraulic pressure of a fluid flowing along the second flow path without blocking the second flow path when subjected to high-frequency/low-amplitude vibration.

Description

{Hydraulic Busing for Vehicle with Variable Decoupler}

The present invention relates to a vehicle hydro bushing that can be used in a general engine vehicle or an electric vehicle, and more particularly, to a vehicle hydro bushing having a variable decoupler capable of adjusting a cross-sectional area of a flow path according to a fluid pressure.

The operation of a vehicle involves vibrations and shocks. These vibrations and shocks include vibrations from the power train, such as the engine or transmission, vibrations from the wheels contacting the road surface, and shocks from uneven surfaces.

To dampen such vibrations and shocks, various vibration damping devices are installed in vehicles.

Vibration damping devices for vehicles are broadly divided into rubber bushings and hydraulic bushings.

While rubber bushings utilize the vibration damping properties of the rubber insulator, hydro bushings utilize the vibration damping properties of the fluid contained inside them to damp vibration or shock.

Both bushings are composed of a core portion having a joining hole formed therein so that they can be joined to a body, etc., a housing provided to surround the core portion while being spaced apart from the core portion, and a dustproof body provided between the core portion and the housing.

Rubber bushings are made of rubber, which is an elastic member, as a vibration damper to dampen vibration or shock, and hydro bushings are made of rubber, which is an elastic member, as a vibration damper, but have multiple liquid chambers and channels connecting them formed inside, and are made by sealing a fluid that flows along the liquid chambers and channels.

Hydro bushings displace fluid in response to pressure changes in the chamber, thereby damping energy from vibration or shock.

Meanwhile, a hydro bushing equipped with a decoupler is known as an advanced form of hydro bushing.

A hydro bushing equipped with a decoupler has a plurality of liquid chambers formed inside, a first flow path formed between the plurality of liquid chambers for absorbing low-frequency/high-amplitude vibrations, and a decoupler formed between the plurality of liquid chambers for absorbing high-frequency/low-amplitude vibrations.

Accordingly, when a low-frequency/high-amplitude vibration of 10 to 30 Hz is input, the decoupler blocks the fluid flow in the second channel through the decoupler, and thus the fluid flows through the first channel and attenuates the vibration.

Meanwhile, when a high-frequency/low-amplitude vibration of 100 to 400 Hz is input, the fluid flows through the second path of the decoupler, thereby attenuating the vibration.

However, in a hydro bushing equipped with a conventional decoupler, the decoupler only opens and closes the second flow path, so it cannot have various characteristics.

Korean Patent No. 10-1499206 "Decoupler Integrated Hydro Bush Mount" (Registered on February 27, 2015)

The present invention has been made to solve the problems of the prior art as described above, and provides a vehicle hydro bushing equipped with a variable decoupler which has improved characteristics by achieving high damping in case of large amplitude vibration and low dynamic stiffness in case of small amplitude vibration when vibration is attenuated through the decoupler.

In order to solve the above-mentioned problem, the present invention provides a hydro bushing including a core portion, a housing spaced apart from the core portion and surrounding a radially outer side of the core portion, and a vibration-isolating body provided between the core portion and the housing and having a first passage connecting the plurality of liquid chambers to absorb low-frequency/high-amplitude vibrations, wherein: the vibration-isolating body includes a decoupler in which a second passage connecting the plurality of liquid chambers to absorb high-frequency/low-amplitude vibrations is formed; and the decoupler includes a membrane configured to block the second passage when a low-frequency/high-amplitude vibration occurs, and a valve member configured to adjust a passage cross-sectional area of the second passage according to a hydraulic pressure of a fluid flowing along the second passage without blocking the second passage when a high-frequency/low-amplitude vibration occurs.

In the above, it is preferable that the valve member reduce the cross-sectional area of the passage when the hydraulic pressure of the fluid flowing along the second passage increases, and restore the cross-sectional area of the passage while returning to its original shape when the hydraulic pressure of the fluid flowing along the second passage decreases.

In the above, it is preferable that the decoupler includes a pair of partitions that are spaced apart from each other and form a membrane receiving portion in the spaced space and in which a fluid flow port is formed, a side wall for a fluid passage that forms a fluid passage on the opposite side of the membrane receiving portion from each of the partitions, the membrane mounted in the membrane receiving portion, and the valve member provided in the fluid passage.

In the above: the damper is formed with a decoupler receiving portion between the plurality of liquid chambers; it is preferable that the decoupler further includes a decoupler case having the partition and the side wall for the fluid passage and being seated in the decoupler receiving portion, and a decoupler cover covering the membrane receiving portion and the fluid passage while fixing the membrane and the valve member.

In the above, the valve member may include a valve frame mounted on an edge of the fluid passage, and a wing-shaped valve body made of a flexible material extending from one end connected to the valve frame toward the center of the valve frame in an opposite direction to the bulkhead.

As described above, the present invention provides a vehicle hydro bushing having a variable decoupler that can have improved characteristics by achieving high damping in large-amplitude vibrations and low dynamic stiffness in small-amplitude vibrations when vibrations are attenuated through the decoupler.

FIG. 1 is a perspective view of a vehicle hydro bushing having a variable decoupler according to one embodiment of the present invention.
Figure 2 is a front view of Figure 1;
Fig. 3 is a cross-sectional view along line AA of Fig. 2.
Figure 4 is a perspective view of Figure 1 with the housing removed.
Figure 5 is a front view of Figure 4.
Figure 6 is a back view of Figure 4.
Fig. 7 is a perspective view showing the decoupler cover in Fig. 4 separated.
Fig. 8 is a perspective view showing the decoupler in Fig. 4 separated.
Fig. 9 is a perspective view of the decoupler of Fig. 4.
Fig. 10 is an exploded perspective view of the decoupler of Fig. 9.
Fig. 11 is a perspective view of the decoupler cover of Fig. 9 from another direction.
Fig. 12 is a front view of the decoupler of Fig. 9.
Fig. 13 is a cross-sectional view based on BB of Fig. 12.
Fig. 14 is a cross-sectional view based on CC of Fig. 13.
Fig. 15 is a cross-sectional view showing another state of Fig. 14.

Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily practice the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. In addition, in order to clearly describe the present invention in the drawings, parts that are not related to the description are omitted, and similar parts are given similar drawing reference numerals throughout the specification.

Throughout the specification, whenever a part is said to "include" a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise stated.

FIG. 1 is a perspective view of a vehicle hydro bushing having a variable decoupler according to one embodiment of the present invention, FIG. 2 is a front view of FIG. 1, FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2, FIG. 4 is a perspective view of FIG. 1 with a housing removed, FIG. 5 is a front view of FIG. 4, FIG. 6 is a rear view of FIG. 4, FIG. 7 is a perspective view of FIG. 4 with a decoupler cover separated, and FIG. 8 is a perspective view of FIG. 4 with a decoupler separated.

A vehicle hydro bushing equipped with a variable decoupler according to one embodiment of the present invention is largely composed of a core portion (100), a vibration-proof body (200), and a housing (300).

The core part (100) is made of a metal material and has an axially extending shape, and a joining hole (101) extending axially is formed inside.

A dustproof body (200) is attached to the core part (100).

In this embodiment, the damper (200) includes a middle ring-shaped frame (210, also called a “middle ring” or “middle pipe”) having a structure that wraps the core portion (100) in a radial direction, an elastic rubber (220) that is vulcanized and bonded between the core portion (100) and the middle ring-shaped frame (210), and a decoupler (400).

The middle ring-shaped frame (210) is not only a part to be combined with the housing (300), but also serves as a frame to maintain the shape of the elastic rubber (220).

The middle ring-shaped frame (210) is made of metal or plastic, and the elastic rubber (220) is made of elastic rubber.

The intermediate ring-shaped frame (210) is a ring or pipe shape that surrounds the radially outer side of the core portion (100).

Elastic rubber (220) is bonded to the outer surface of the core portion (100) and vulcanized to the core portion (100) and the intermediate ring-shaped frame (210) so that part or all of the intermediate ring-shaped frame (210) is embedded therein, thereby forming a plurality of liquid chambers (221, 222).

As shown in FIGS. 3 and 4, a liquid chamber (221) is formed in the upper part of the dustproof body (200), and a liquid chamber (222) is formed in the lower part of the dustproof body (200).

A first flow path (223) connecting a pair of liquid chambers (221, 222) is formed in the damper (200).

The shape of the first euro (223) can be confirmed in Figs. 5 and 6.

The first euro (223) is intended to absorb low frequency/high amplitude vibrations between 10 and 30 Hz.

Meanwhile, the damper (200) has a decoupler receiving portion (224) formed between a pair of liquid chambers (221, 222), and a decoupler (400) is mounted in the decoupler receiving portion (224).

A decoupler (400) is formed with a second channel (separate from the first channel (223)) connecting a pair of liquid chambers (221, 222) to absorb high-frequency/low-amplitude vibrations exceeding approximately 30 Hz, more preferably 100 to 400 Hz, and is configured to block the second channel when there is low-frequency/high-amplitude vibration between 10 and 30 Hz.

The structure of the decoupler (400) is described later.

When a cylindrical housing (300) is combined with a damper (200) of this type, the radial outer sides of each chamber (221, 222), the first flow path (233), and the decoupler (400) are completely covered.

Specifically, a housing (300) is assembled to the middle ring-shaped frame (210) of the damper (200), so that the fluid contained in each chamber (221, 222), the first flow path (233), and the decoupler (400) does not leak to the outside.

Since the assembly of the damper (200) and the housing (300) is a very common technique, a detailed description is omitted.

As a result, a vibration-proof body (200) including elastic rubber (220) is provided between the core part (100) and the housing (300) that surrounds the radial outer side of the core part (100).

Below, the detailed structure of the decoupler (400) is described.

FIG. 9 is a perspective view of the decoupler of FIG. 4, FIG. 10 is an exploded perspective view of the decoupler of FIG. 9, FIG. 11 is a perspective view showing the decoupler cover of FIG. 9 from another direction, FIG. 12 is a front view of the decoupler of FIG. 9, FIG. 13 is a cross-sectional view taken along line B-B of FIG. 12, FIG. 14 is a cross-sectional view taken along line C-C of FIG. 13, and FIG. 15 is a cross-sectional view showing another state of FIG. 14.

A decoupler (400) according to one embodiment of the present invention includes a decoupler case (410), a membrane (420), a valve member (430), and a decoupler cover (440).

The decoupler case (410) is formed with a case frame (411) in the shape of the letter “ㄷ” for being mounted in the decoupler receiving portion (224), a pair of partition walls (413) that are spaced apart from each other to form a membrane receiving portion (412) in the spaced apart space, and a plurality of side walls (415) for fluid passages that form a fluid passage (414) on the opposite side of the membrane receiving portion (412) from each partition wall (413).

In this embodiment, the case frame (411), a pair of bulkheads (413), and a plurality of side walls (415) for fluid passages are formed integrally.

In this embodiment, a plurality of fluid flow ports (413a) are formed in each bulkhead (413), and a fluid passage (414) is connected to each fluid flow port (413a).

A membrane (420) is inserted into the membrane receiving portion (412) to form a gap between the membrane receiving portions (412) and allow fluid to flow along the gap.

Additionally, the membrane (420) is configured to block the fluid flow port (413a) during low-frequency/high-amplitude vibration.

On both sides of the membrane (420), rigidity-maintaining protrusions (421) are formed protrudingly, and in addition, a plurality of position-maintaining protrusions (422) are formed protrudingly along the edges.

The rigidity maintaining protrusion (421) and position maintaining protrusion (422) of the membrane (420) are pressed against the decoupler case (410) so that the posture and position of the membrane (420) are maintained.

In addition, the membrane (420) has a small cross-sectional area in the central portion to enable smooth opening and closing operation (i.e., operation of blocking or not blocking the fluid flow port (413a)).

A valve member (430) is provided for each fluid passage (414) formed by a side wall (415) for the fluid passage.

The valve member (430) includes a T-shaped valve frame (431) mounted on the edge of the fluid passage (414), and a pair of wing-shaped valve bodies (432) protruding from the valve frame (431) toward the center of the fluid passage (414).

The wing-shaped valve body (432) extends from one end connected to the valve frame (431) toward the center of the valve frame (431) in the opposite direction of the bulkhead (413) to form a variable passage (433) with a reduced cross-sectional area of the fluid passage (414) inside the fluid passage.

The valve member (430) is made of flexible rubber or flexible synthetic resin material so that the wing-shaped valve body (432) can bend according to the hydraulic pressure of the fluid flowing through the fluid passage (414) to adjust the flow path cross-sectional area of the variable passage (433).

More specifically, the wing-shaped valve body (432) reduces the flow path cross-sectional area of the variable passage (433) when the hydraulic pressure of the fluid flowing along the second passage increases, and at the same time, when the hydraulic pressure of the fluid flowing along the second passage decreases, it returns to its original shape, thereby restoring the flow path cross-sectional area of the variable passage (433).

In this way, with the membrane (420) and valve member (430) mounted on the decoupler case (410), the open surface of the decoupler case (410) is covered by the decoupler cover (440).

The decoupler cover (440) is secured to the decoupler case (410) and covers the membrane receiving portion (412) and the fluid passage (414) while securing the membrane (420) and the valve member (430).

The operation of a vehicle hydro bushing equipped with the above-described variable decoupler is described.

When a low-frequency/high-amplitude vibration of 10 to 30 Hz is input, the fluid flow port (413a) is closed by the membrane (420), and the low-frequency/high-amplitude vibration is attenuated by the first flow path (223).

When a high-frequency/low-amplitude vibration exceeding approximately 30 Hz, more preferably 100 to 400 Hz, is input, the high-frequency/low-amplitude vibration is attenuated as the fluid flows through the second passage passing through the gap between the membrane (420) and the membrane receiving portion (412) of the decoupler (400).

Meanwhile, when a relatively large amplitude vibration is input when the decoupler (400) is in operation (see Fig. 15), the hydraulic pressure of the fluid increases and the wing-shaped valve body (432) reduces the cross-sectional area of the variable passage (433) to achieve high damping.

On the other hand, when a relatively small amplitude vibration is input when the decoupler (400) is in operation (see Fig. 14), the hydraulic pressure of the fluid decreases, the wing-shaped valve body (432) is restored to its original shape, and the cross-sectional area of the variable passage (433) is restored (i.e., expanded) to have low dynamic stiffness.

The above description of the present invention is for illustrative purposes, and those skilled in the art will understand that the present invention can be easily modified into other specific forms without changing the technical idea or essential features of the present invention. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. For example, each component described as a single component may be implemented in a distributed manner, and likewise, components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the claims described below rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention.

100 : Core
200 : Dustproof
210 : Intermediate ring type frame
220 : Elastic rubber
221 : Axil 222 : Axil
223: Euro 1 224: Decoupler receiving section
300 : Housing
400 : Decoupler
410 : Decoupler Case 411 : Case Frame
412: Membrane receiving portion 413: Bulkhead
413a: Fluid flow port 414: Fluid passage
415: Bulkhead for fluid passage
420: Membrane 421: Stiffness-retaining protrusion
422 : Position holding projection
430 : Valve Absence
431: Valve frame 432: Wing-shaped valve body
433: Variable passage
440 : Decoupler cover

Claims (5)

A hydro bushing comprising a core portion, a housing spaced apart from the core portion and surrounding a radially outer side of the core portion, and a vibration-proof body formed between the core portion and the housing, wherein a plurality of liquid chambers and a first flow path connecting the plurality of liquid chambers are formed to absorb low-frequency/high-amplitude vibrations:
The above-mentioned vibration damper includes a decoupler in which a second path connecting the plurality of liquid chambers is formed to absorb high-frequency/low-amplitude vibrations;
The above decoupler includes a membrane configured to block the second flow path when subjected to low-frequency/high-amplitude vibration, and a valve member configured to adjust the flow path cross-sectional area of the second flow path according to the hydraulic pressure of a fluid flowing along the second flow path without blocking the second flow path when subjected to high-frequency/low-amplitude vibration;
Hydro bushing for vehicles with variable decoupler featuring:
In the first paragraph,
A vehicle hydro bushing having a variable decoupler, characterized in that the valve member reduces the cross-sectional area of the passage when the hydraulic pressure of the fluid flowing along the second passage increases, and restores the cross-sectional area of the passage while returning to its original shape when the hydraulic pressure of the fluid flowing along the second passage decreases.
In claim 1 or 2,
A vehicle hydro bushing having a variable decoupler, characterized in that the decoupler comprises a pair of partitions that are spaced apart from each other and form a membrane receiving portion in the spaced space and in which a fluid flow port is formed, a side wall for a fluid passage that forms a fluid passage on the opposite side of the membrane receiving portion from each of the partitions, the membrane mounted in the membrane receiving portion, and the valve member provided in the fluid passage.
In paragraph 3:
The above-mentioned damper has a decoupler receiving portion formed between the plurality of liquid chambers;
The above decoupler further includes a decoupler case having the partition and the side wall for the fluid passage and being seated in the decoupler receiving portion, and a decoupler cover covering the membrane receiving portion and the fluid passage while fixing the membrane and the valve member;
Hydro bushing for vehicles with variable decoupler featuring:
In the third paragraph,
A vehicle hydro bushing having a variable decoupler, characterized in that the valve member includes a valve frame mounted on an edge of the fluid passage, and a wing-shaped valve body made of a flexible material extending from one end connected to the valve frame toward the center of the valve frame and in an opposite direction to the bulkhead.