Hydraulic mount having unidirectional damping membrane

Abstract

The present disclosure relates to a hydraulic mount having a unidirectional damping membrane. A hole is formed in a membrane and a one-way closure having upper and lower portions, which are different from each other, is inserted into the hole to control a flow of a fluid. The one-way closure means includes: a body which intermittently closes a lower side of the hole formed at a center of the membrane; a column portion which is vertically formed at a center of the body; and a moving closure which is formed at an upper portion of the column portion and closes an upper side of the hole.

Claims

1. A hydraulic mount comprising: an engine mount including a center bolt that is inserted into a housing for fixing the engine mount to an engine; a main rubber provided at an outer circumferential surface of the engine mount; and a membrane configured to vibrate in response to deformation of the main rubber and to divide an interior space of the hydraulic mount into an upper liquid chamber and a lower liquid chamber, wherein a hole is formed at a central portion of the membrane so that a fluid flows into the upper liquid chamber and the lower liquid chamber by outside pressure, and wherein a one-way closure means is installed in the hole such that damping is enabled only in one direction, wherein the one-way closure means includes a moving closure which is formed at an upper portion of a column portion and configured to close an upper side of the hole formed in the membrane, and wherein a lower portion of the moving closure has an inverted conical shape, and has a plurality of longitudinal protrusions formed at an equal interval.

2. The hydraulic mount of claim 1, wherein the one-way closure means includes: a body configured to intermittently close a lower side of the hole formed at the center of the membrane; and the column portion which is vertically formed at a center of the body and connected to the lower portion of the moving closure.

3. The hydraulic mount of claim 1, wherein the one-way closure means is made of an insulator or a silicone material.

4. The hydraulic mount of claim 2, wherein the membrane includes an orifice, which is installed on a lower surface of the membrane and has a plurality of protrusions and a plurality of holes.

5. The hydraulic mount of claim 2, wherein an upper portion of the body has an inclined surface, and has ring-shaped protrusions protruding at an equal interval about a center of the column portion.

6. The hydraulic mount of claim 1, wherein an upper surface of the membrane has a first inclined portion which comes into contact with a lower portion of the moving closure, and a lower surface of the membrane has a second inclined portion which comes into contact with the body.

7. The hydraulic mount of claim 1, wherein the membrane includes: a first flow path which is formed to send the fluid in the upper liquid chamber to the lower liquid chamber; a second flow path which is formed at a center of the membrane and in which the one-way closure means is installed; and a third flow path which is installed between the first and second flow paths.

8. The hydraulic mount of claim 1, wherein a metal material is inserted into any one or both of the body and the column portion that constitute the one-way closure means.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a view illustrating a cross section of an engine mount for a vehicle.

(2) FIG. 2 is a cross-sectional view illustrating a state in which a hydraulic mount having a unidirectional damping membrane according to embodiments of the present invention is installed.

(3) FIG. 3 is a perspective view illustrating only a one-way closure means according to embodiments of the present invention.

(4) FIGS. 4A and 4B illustrate a membrane on which the one-way closure means according to embodiments of the present invention is installed.

(5) FIGS. 5A and 5B are cross-sectional views illustrating an operation of the one-way closure means according to embodiments of the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(6) Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains may easily carry out the present invention. However, the present invention may be implemented in various different ways, and is not limited to embodiments described herein.

(7) A part irrelevant to the description will be omitted to clearly describe embodiments of the present invention, and the same or similar constituent elements will be designated by the same reference numerals throughout the specification.

(8) Terms or words used in the specification and the claims should not be interpreted as being limited to a general or dictionary meaning and should be interpreted as a meaning and a concept which conform to the technical spirit of the present invention based on a principle that an inventor can appropriately define a concept of a term in order to describe his/her own invention by the best method.

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

(10) According to an aspect of the present invention, a hydraulic mount for mounting an engine on a vehicle frame is disclosed. The hydraulic mount comprising two liquid chambersan upper liquid chamber and a lower liquid chamber. An elastic membrane 30 interposed between the liquid chambers has a through hole 31 connecting the upper liquid chamber and the lower liquid chamber.

(11) In embodiments, a rigid closure member 100 inserted into the through hole 31, in its closing position (with respect to the through hole 31), blocks liquid communication between the upper liquid chamber and the lower liquid chamber when no external vibration is transferred to the hydraulic engine mount. In embodiments, in response to an upward vibration from the bottom of the lower liquid chamber, the rigid closure member 100 is lifted, from the closing position to an opening position, to allow liquid communication between the upper liquid chamber and the lower liquid chamber such that damping against the upward vibration is provided.

(12) In embodiments, in response to a downward vibration applied from the top of the upper liquid chamber, the closure member 100 moves down together with a portion of the membrane contacting the closure member 100. However the closure member 100 remains its closing position with respect to the through hole 31 such that disconnection between the upper liquid chamber and the lower liquid chamber is maintained regardless of downward movement of the closure member 100. Accordingly, flow between the two liquid chambers across the membrane through the hole 31 is restricted to one direction from the lower liquid chamber to the upper liquid chamber such that damping of the hydraulic mount is unidirectional (responsive to an upward vibration from the bottom and not responsive to a downward vibration from the top).

(13) As illustrated in FIG. 2, a hydraulic mount having a unidirectional damping membrane according to embodiments of the present invention is basically identical to the related art in that the hydraulic mount includes an engine mount 10 which has a center bolt that is inserted into a housing 20 and fastened to an engine, a main rubber 11 which is provided at an outer circumferential surface of the engine mount, and a membrane 30 which vibrates in response to elastic behavior of the main rubber and divides an interior into an upper liquid chamber and a lower liquid chamber.

(14) In some embodiments, a hole 31 is formed at a central portion of the membrane 30 so that a fluid flows into the upper liquid chamber and the lower liquid chamber by outside pressure, and a one-way closure means 100 is installed in the hole 31.

(15) In more detail, the one-way closure means 100 is made of an insulator or a silicone material, and as illustrated in FIG. 3 or FIGS. 4A and 4B, a body 110 is formed to intermittently close a lower side of the hole 31 formed at the center of the membrane 30, and a column portion 120 is vertically formed at a center of the body 110.

(16) A moving closure 130 for closing an upper side of the hole formed in the membrane 30 is integrally formed at an upper portion of the column portion 120.

(17) In this case, the upper portion of the body 110 has a conical shape entirely having an inclined surface, and ring-shaped protrusions 111 protrude at an equal interval about a center of the column portion 120. In addition, a lower portion of the moving closure 130 has an inverted conical shape, and a plurality of longitudinal protrusions 131 protrudes at an equal interval. The longitudinal protrusion 131 is a protrusion in the form of a long band and serves to allow the fluid to flow through the hole 31 formed in the membrane 30 when the fluid flows from the upper liquid chamber to the lower liquid chamber, that is, the longitudinal protrusion 131 serves as a dual orifice.

(18) Therefore, as described above, a target frequency dualization is enabled by dynamic characteristics by the dual orifice, and resistance is reduced when the fluid flows, such that dynamic characteristics may be established.

(19) In addition, as the ring-shaped protrusions 111 close the hole 31 formed in the membrane 30, a flow of the fluid flowing from the upper liquid chamber to the lower liquid chamber is perfectly blocked, and a flow of the fluid is guided only to the orifice, thereby ensuring high damping properties.

(20) As illustrated in FIG. 5A, an upper surface of the membrane has a first inclined portion 30a which comes into contact with the lower portion of the moving closure 130 that constitutes the one-way closure means 100, an orifice 32, which has a second inclined portion 30b that comes into contact with the body 110, is installed on a lower surface of the membrane 30, and the first and second inclined surfaces 30a and 30b are inclined toward the hole 31.

(21) FIG. 4A is a view for explaining various flow paths, and FIGS. 4A and 4B are views illustrating a state in which the one-way closure means is installed in an orifice formed in the membrane. As illustrated in FIG. 4A, a first flow path L1 is formed in the membrane 30 to send the fluid in the upper liquid chamber to the lower liquid chamber, the hole 31 formed at the center is used as a second flow path L2. As illustrated in FIG. 4A, a plurality of protrusions 321 and a plurality of holes 322 formed between the first and second flow paths L1 and L2 provide third flow paths L3. As illustrated in FIG. 4A, the plurality of protrusions 321 extend from the orifice 32.

(22) In this case, the protrusions have various shapes and heights, such that low dynamic characteristics may be implemented in accordance with the heights and the shapes of the protrusions.

(23) A metal material may be inserted into any one or both of the body 110 and the column portion 120 that constitute the one-way closure means 100, thereby allowing the one-way closure means 100 to serve as a dynamic damper.

(24) With this performance, a resonance region of the mount is shifted to a low frequency band, such that it is easier to separate the resonance region from a vehicle vibratory frequency.

(25) Therefore, as illustrated in FIGS. 4A and 4B, in the hydraulic mount having a unidirectional damping membrane according to embodiments of the present invention, the three flow paths, that is, the first flow path L1, the second flow path L2, and the third flow path L3 are formed in the membrane 30, such that it is possible to ensure dynamic characteristics and a loss factor in a low frequency region by adjusting lengths and sizes of the flow paths when the fluid flows through the first flow path L1.

(26) FIG. 5A is a view illustrating a state in which a fluid flows from an upper liquid chamber to a lower liquid chamber, and FIG. 5B is a view illustrating a state in which the one-way closure means is raised to close the flow path.

(27) As illustrated in FIGS. 5A and 5B, the one-way closure means 100 is installed in the hole 31 formed at the center of the membrane 30, such that when the fluid flows through the second flow path L2, the fluid may flow from the upper liquid chamber to the lower liquid chamber, but a flow of the fluid from the lower liquid chamber to the upper liquid chamber is blocked, thereby ensuring a high loss factor.

(28) That is, as illustrated in FIG. 5B, the ring-shaped protrusions 111 formed on the body 110 tightly block the lower inclined surface 30b of the orifice 32, such that an additional flow path in the arrow direction is blocked, thereby ensuring a high damping performance in accordance with an inertia damper.

(29) Therefore, it is possible to obtain low dynamic characteristics and a high loss factor in an intermediate frequency region.

(30) The plurality of protrusions formed on the orifice 32 has different shapes and different heights, such that when the fluid flows through the third flow path L3, the fluid flows intermittently. This flow of the fluid may implement low dynamic characteristics, and this method is identical to a method of implementing a performance of a fluid mount that constitutes the existing floating type membrane.

(31) The metal material may be inserted into any one or both of the body 110 and the column portion 120 that constitute the one-way closure means 100, thereby allowing the one-way closure means 100 to serve as a dynamic damper. With this performance, a resonance region of the mount is shifted to a low frequency band, such that it is easier to separate the resonance region from a vehicle vibratory frequency.

(32) While the present invention has been described with reference to its embodiments and the accompanying drawings, different embodiments may be implemented within the spirit and the scope of the present invention. Therefore, it should be construed that the scope of the present invention is defined by the appended claims, and not limited to a particular embodiment disclosed in the present specification.