Fluid-sealed engine mounts

Abstract

The present invention provides a fluid-sealed engine mount that controls the movement of an engine mounted to a vehicle body and isolates vibrations. Specifically, compared to conventional engine mounts, the fluid-sealed engine mount improves vibration damping performance and dynamic characteristics, thereby improving noise, vibration, and harshness (NVH) performance.

Description

Technical Field

[0001] The present invention generally relates to a fluid-sealed engine mount and, more particularly, to a fluid-sealed engine mount that controls movement and isolates vibrations of an engine mounted to a vehicle body. Background Art

[0002] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

[0003] Generally, an engine mount is used to control the movement of an engine and isolate a vehicle from vibration. As a conventional engine mount, a fluid-sealed engine mount is used to isolate vibration of an engine generated in a wide frequency band.

[0004] Conventional fluid-sealed engine mounts use isolators and fluid to absorb engine vibrations. The isolators are attached to a mounting core, which is connected to the engine and absorbs engine vibrations. The fluid absorbs engine vibrations while passing through a fluid channel between an upper and lower fluid chamber arranged below the isolators. The upper and lower fluid chambers are separated by a diaphragm and a nozzle unit arranged between them, with the fluid channel provided in the nozzle unit.

[0005] Figure 16 is a schematic diagram showing an assembled state between a diaphragm and a nozzle unit for a conventional fluid-sealed engine mount.

[0006] like Figure 16 As shown, when the edge of the diaphragm 1 is mounted to the center portion of the nozzle unit 2, the diaphragm 1 is fixed to the nozzle unit 2, and moves with the flow of fluid in the upper and lower fluid chambers to absorb engine vibration.

[0007] During the movement of the diaphragm 1 with the flow of the fluid, the diaphragm 1 generates noise by colliding with the nozzle unit 2. To reduce the noise, the edge of the diaphragm 1 is installed at the center of the nozzle unit 2 without vertical overlap or horizontal gap.

[0008] However, the applicant has found that when the edge of the diaphragm 1 is mounted to the nozzle unit 2 without a horizontal gap, the following problems may arise.

[0009] First, when the diaphragm 1 moves with the flow of fluid, noise is generated due to friction between the diaphragm 1 and the nozzle unit 2, and the friction deteriorates the robustness of the diaphragm 1 and the nozzle unit 2.

[0010] Second, when the firmness of the diaphragm 1 increases, the dynamic characteristics of the engine mount increase, and when the firmness of the diaphragm 1 decreases, the damping performance of the engine mount decreases, so there is a limit to the characteristic adjustment of the engine mount. Summary of the Invention

[0011] The present invention provides a fluid-sealed engine mount in which vibration damping performance is improved and dynamic characteristics are reduced / improved compared to conventional engine mounts, thereby improving noise, vibration and harshness (NVH) performance.

[0012] In one aspect of the present invention, a fluid-sealed engine mount may include: a nozzle unit and a diaphragm, wherein the nozzle unit divides a fluid chamber into an upper fluid chamber and a lower fluid chamber, the nozzle unit including a fluid passage provided for fluid flow between the upper and lower fluid chambers; the diaphragm is arranged in a radial direction of the nozzle unit at a central portion thereof and elastically vibrates due to the fluid flow. Specifically, the fluid chamber may be surrounded by a partition and a diaphragm and filled with fluid; the diaphragm may include a diaphragm lip formed by extending along a circumferential direction of the diaphragm at an edge portion of the diaphragm, and the diaphragm lip is inserted into and fixed to an inner circumferential portion of the nozzle unit. In another embodiment, the diaphragm lip may include a diaphragm passage provided at a portion of the diaphragm lip in a circumferential direction of the diaphragm lip; the nozzle unit may include an annular nozzle groove portion, the diaphragm lip being inserted into and arranged in the annular nozzle groove portion; the nozzle passage is provided in an inner circumferential portion of the nozzle groove portion, and the nozzle passage and the diaphragm passage together provide a fluid passage for fluid flow.

[0013] The diaphragm passage may be arranged to be collinear with the nozzle passage based on a radial direction of the diaphragm.

[0014] The nozzle unit may include: a nozzle lower plate and a nozzle upper plate, the nozzle lower plate having a lower groove portion on its upper surface portion; the nozzle upper plate is installed to the upper surface portion of the nozzle lower plate while being stacked, and has an upper groove portion on the lower surface portion of the nozzle upper plate to constitute a nozzle groove portion together with the lower groove portion; wherein, the upper inner edge portion which can serve as the inner circumferential portion of the nozzle upper plate can have an upper passage adjacent to the upper groove portion, and the lower edge portion which can serve as the inner circumferential portion of the nozzle lower plate can have a lower passage adjacent to the lower groove portion, and the upper passage can constitute a nozzle passage together with the lower passage.

[0015] The lip edge of the diaphragm may include: an upper protrusion of the lip edge, a lower protrusion of the lip edge and a side protrusion of the lip edge, wherein the upper protrusion of the lip edge is formed by protruding upward, and the upper protrusion of the lip edge has an upper surface portion that can be in close contact with the upper surface of the upper groove portion; the lower protrusion of the lip edge is formed by protruding downward, and the lower protrusion of the lip edge has a lower surface portion that can be in close contact with the lower surface of the lower groove portion; the side protrusion of the lip edge is formed by protruding outward in the radial direction of the lip edge of the diaphragm, and the side protrusion of the lip edge has an outer circumferential surface that can be in close contact with the outer circumferential surface of the lower groove portion.

[0016] The nozzle unit may include a restriction portion disposed adjacent to each opposite side of the nozzle passage in a circumferential direction of the nozzle unit, and the restriction portion may be in close contact with the diaphragm lip to allow fluid to flow only through the diaphragm passage and the nozzle passage.

[0017] The flow limiting portion may include: an upper limiting protrusion and a lower limiting protrusion, wherein the upper limiting protrusion may be formed on the lower surface portion of the nozzle upper plate and arranged adjacent to the upper passage, the upper limiting protrusion is in close contact with the inner circumferential surface and the outer circumferential surface of the lip upper protrusion, and is in close contact with the upper surface of the lip side protrusion and the upper surface of the central portion of the diaphragm; the lower limiting protrusion may be formed on the upper surface portion of the nozzle lower plate and arranged adjacent to the lower passage, the lower limiting protrusion is in close contact with the inner circumferential surface and the outer circumferential surface of the lip lower protrusion, and is in close contact with the lower surface of the lip side protrusion and the lower surface of the central portion of the diaphragm.

[0018] The nozzle upper plate may include a plurality of upper support portions in the upper groove portion, the plurality of upper support portions being arranged to be spaced apart from each other along the circumferential direction of the upper groove portion, and each upper support portion may include: a first upper support protrusion and a second upper support protrusion, wherein the first upper support protrusion is formed by protruding from the outer circumferential surface of the upper inner edge portion, and the first upper support protrusion is positioned to be in close contact with the inner circumferential surface of the lip upper protrusion; the second upper support protrusion is formed by protruding from the inner circumferential surface of the upper outer edge portion arranged on the outer circumference of the upper groove portion, and the second upper support protrusion is positioned to be in close contact with the outer circumferential surface of the lip upper protrusion.

[0019] The nozzle lower plate may include a plurality of lower support portions in the lower groove portion, and the plurality of lower support portions are arranged to be spaced apart from each other along the circumferential direction of the lower groove portion, and each lower support portion may include: a first lower support protrusion and a second lower support protrusion, wherein the first lower support protrusion is formed by protruding from the outer circumferential surface of the lower edge portion, and the first lower support protrusion is positioned to be in close contact with the inner circumferential surface of the lip lower protrusion; the second lower support protrusion is formed by protruding from the inner circumferential surface of the annular boss, the inner circumferential surface of the annular boss may be the outer circumferential portion of the lower groove portion, and the second lower support protrusion is positioned to be in close contact with the outer circumferential surface of the lip lower protrusion.

[0020] The radial width of the nozzle recess portion may be greater than the radial width of the diaphragm lip.

[0021] The nozzle lower plate may include an annular boss in close contact with the lower surface portion of the nozzle upper plate, and the annular boss may include a connecting channel, which is arranged on the upper surface portion of the annular boss along the radial direction of the nozzle lower plate on the same straight line as the nozzle passage, and the connecting channel may be configured to connect the nozzle passage to the fluid channel in a fluid flow manner.

[0022] Through the above technical solutions, the present invention has the following effects.

[0023] First, compared to conventional engine mounts, additional adjustment elements such as the diaphragm passage, nozzle passage, and connection channel to the nozzle lower plate are ensured. This enables low dynamic characteristics and enhanced vibration damping performance, thereby improving NVH performance and ride quality under various road conditions.

[0024] Second, the diaphragm lip is supported by the upper support portion of the nozzle upper plate and the lower support portion of the nozzle lower plate. Therefore, the contact area between the diaphragm lip, the nozzle upper plate, and the nozzle lower plate can be minimized, thereby reducing friction noise caused by diaphragm movement.

[0025] Other areas of applicability will become apparent from the description provided herein.It should be understood that the description and specific examples are intended for illustration purposes only and are not intended to limit the scope of protection of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order that the invention may be better understood, various forms thereof will now be described by way of example only, with reference to the accompanying drawings, in which:

[0027] Figure 1 is a schematic diagram showing the structure of a fluid-sealed engine mount according to one form of the present invention;

[0028] Figure 2 is a perspective view showing a nozzle unit and a diaphragm of the structure of a fluid-sealed engine mount according to a first form of the present invention;

[0029] Figure 3 is a schematic diagram showing an assembled state between a nozzle unit and a diaphragm according to a first form of the present invention;

[0030] Figure 4 It is along Figure 3 The schematic diagram presented by line AA in FIG;

[0031] Figure 5 It is along Figure 3 The schematic diagram presented by line BB in FIG;

[0032] Figure 6 It is along Figure 3 Schematic diagram presented by line CC in;

[0033] Figure 7 It is along Figure 3 The schematic diagram presented by line DD in FIG;

[0034] Figure 8is a bottom view of a nozzle upper plate showing the structure of a nozzle unit according to a first form of the present invention;

[0035] Figure 9 is a top view of a nozzle lower plate showing the structure of a nozzle unit according to a first form of the present invention;

[0036] Figure 10 is a top view showing a nozzle lower plate according to a second form of the present invention;

[0037] Figure 11 is a schematic diagram showing a flow path of a fluid through a space between a diaphragm and a nozzle unit according to a first form of the present invention;

[0038] 12A to 12C is a schematic diagram showing a flow path of a fluid through a space between a diaphragm and a nozzle unit according to a second form of the present invention;

[0039] Figure 13 is a schematic diagram showing an assembled state between a nozzle unit and a diaphragm according to a third form of the present invention;

[0040] Figure 14 is a top view showing a nozzle lower plate according to a third form of the present invention;

[0041] Figure 15A and Figure 15B is a schematic diagram showing a flow path of a fluid through a space between a diaphragm and a nozzle unit according to a third form of the present invention; and

[0042] Figure 16 is a schematic diagram showing an assembled state between a diaphragm and a nozzle unit for a conventional fluid-sealed engine mount.

[0043] The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. DETAILED DESCRIPTION

[0044] The following description is merely exemplary in nature and is not intended to limit the present invention, its application or uses. It should be understood that throughout the specification and drawings, corresponding reference numerals indicate the same or corresponding parts and features.

[0045] The exemplary forms of the present invention will be described in detail below in conjunction with the accompanying drawings. All components shown in the accompanying drawings are schematic diagrams to facilitate description of the forms of the present invention and may be different from those actually implemented.

[0046] Unless the context clearly indicates otherwise, it should also be understood that when the terms "comprises," "comprising," "including," and / or "comprising" are used in this document, it indicates the presence of the stated features, integers, steps, operations, elements, and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0047] The present invention relates to a fluid-sealed engine mount having improved damping performance and reduced / improved dynamic characteristics compared to existing engine mounts, thereby improving noise, vibration, and harshness (NVH) performance.

[0048] A fluid-sealed engine mount is a mount in which fluid is sealed in an internal fluid chamber and is installed between the engine and the vehicle body for isolating vibrations.

[0049] like Figure 1 As shown, in the fluid-sealed engine mount of the present invention, the fluid chamber surrounded by the spacer 10 and the diaphragm 20 is filled with fluid.

[0050] The insulator 10 is vulcanized and attached to an outer surface of a mount corner 30 connected to the engine, and receives vibration of the engine through the mount corner 30 .

[0051] The diaphragm 20 is arranged below the spacer 10 and provides a fluid chamber of the engine mount together with the spacer 10 .

[0052] The fluid chamber is partitioned into an upper fluid chamber 40 and a lower fluid chamber 50 by the nozzle unit 100 , and the nozzle unit 100 has a fluid channel 121 for the flow of fluid between the upper fluid chamber 40 and the lower fluid chamber 50 .

[0053] The fluid is used together with the isolator 10 to absorb the vibration of the engine. When the fluid passes through the fluid passage 121 between the upper fluid chamber 40 and the lower fluid chamber 50, it can absorb large displacement vibration in the low frequency band.

[0054] The nozzle unit 100 , together with the diaphragm 200 , divides the fluid chamber into an upper fluid chamber 40 and a lower fluid chamber 50 .

[0055] The diaphragm 200 is disposed at a radially central portion of the nozzle unit 100 and elastically vibrates by the flow of fluid. Specifically, the diaphragm 200 absorbs vibrations of the engine while vibrating vertically as the amount of fluid increases or decreases.

[0056] like Figures 2 to 7As shown, the diaphragm 200 includes a diaphragm body 210 located at a central portion of the diaphragm 200 and a diaphragm lip 220 protruding from a circumferential surface of the diaphragm body 210 .

[0057] The diaphragm body 210 is formed in a disk shape having a vertical predetermined thickness, and the diaphragm lip 220 is formed to extend on a circumferential surface of the diaphragm body 210 in a circumferential direction thereof.

[0058] The diaphragm body 210 can be arranged in the open center portion of the nozzle unit 100 to withstand the pressure of the fluid and can vibrate due to the fluid pressure acting on its upper and lower surface portions. In other words, when the vibration of the engine is input into the isolator 10, the diaphragm body 210 can vibrate vertically.

[0059] The diaphragm lip 220 is an annular edge of the diaphragm 200 , and is inserted into and fixed to the inner circumferential portion of the nozzle unit 100 .

[0060] The diaphragm lip 220 may have at least one diaphragm passage 230 in its circumferential direction. Figure 2 As shown, the diaphragm lip 220 may include two diaphragm passages 230 , and the two diaphragm passages 230 may be arranged to face each other.

[0061] The diaphragm passage 230 is a portion in the edge of the diaphragm 200 where the diaphragm lip 220 is not formed, and the diaphragm passage 230 serves as a passage through which fluid flows.

[0062] In order to enable the fluid to flow in the diaphragm passage 230 , the nozzle unit 100 includes a nozzle passage 130 that is arranged radially collinear with the diaphragm passage 230 .

[0063] The annular nozzle groove portion 140 is located outside the open center portion of the nozzle unit 100 so that the diaphragm lip 220 is inserted therein, and the nozzle passage 130 is provided in the inner circumferential portion (i.e., the upper inner edge portion and the lower edge portion) of the nozzle groove portion 140. For example, Figure 2 and Figure 4 As shown, the nozzle unit 100 may have two nozzle passages 130 , and the two nozzle passages 130 may be arranged to face each other.

[0064] The nozzle passage 130 and the diaphragm passage 230 together provide a passage for fluid flow, and the fluid can move between the upper fluid chamber 40 and the lower fluid chamber 50 while passing through the nozzle passage 130 and the diaphragm passage 230. When the fluid flows through the nozzle passage 130 and the diaphragm passage 230, the fluid can absorb vibrations in small displacement vibrations within a high frequency band.

[0065] like Figure 2 、 Figure 8 as well as Figure 9 As shown, the nozzle recess portion 140 includes an upper recess portion 141 of the nozzle upper plate 110 and a lower recess portion 142 of the nozzle lower plate 120 .

[0066] The nozzle unit 100 includes an upper nozzle plate 110 and a lower nozzle plate 120 . The upper nozzle plate 110 has an upper groove portion 141 on a lower surface portion thereof, and the lower nozzle plate 120 has a lower groove portion 142 on an upper surface portion thereof.

[0067] The nozzle upper plate 110 is mounted by press-fitting on the upper surface of the nozzle lower plate 120 in a stacked shape. Figure 4 As shown, when the nozzle upper plate 110 is mounted to the nozzle lower plate 120, the upper groove portion 141 is arranged to be stacked above the lower groove portion 142. The upper groove portion 141 and the lower groove portion 142 arranged below the upper groove portion 141 together provide the nozzle groove portion 140. Therefore, the sum of the vertical depth of the upper groove portion 141 and the vertical depth of the lower groove portion 142 becomes the vertical depth of the nozzle groove portion 140.

[0068] The nozzle upper plate 110 has an open center portion, and the upper groove portion 141 is arranged outside the center portion of the nozzle upper plate 110. Thus, the fluid pressure of the upper fluid chamber 40 acts on the upper surface portion of the diaphragm body 210 through the center portion of the nozzle upper plate 110.

[0069] The upper passage 131 is provided adjacent to the upper groove portion 141 at the upper inner edge portion 111, which is the inner circumferential portion of the nozzle upper plate 110. Specifically, the inner circumferential portion of the nozzle upper plate 110 has a ring-shaped upper inner edge portion 111, and the upper passage 131 is formed in at least a portion of the circumferential direction of the upper inner edge portion 111. The upper passage 131 is configured to open a section along the circumferential direction of the upper inner edge portion 111.

[0070] The nozzle lower plate 120 has an open center portion, and the lower groove portion 142 is arranged outside the center portion of the nozzle lower plate 120. As such, the lower fluid pressure of the fluid chamber 50 acts on the lower surface portion of the diaphragm body 210 through the center portion of the nozzle lower plate 120.

[0071] The lower passage 132 is provided adjacent to the lower groove portion 142 at the lower edge portion 122, which is the inner circumferential portion of the nozzle lower plate 120. Specifically, the inner circumferential portion of the nozzle lower plate 120 has an annular lower edge portion 122, and the lower passage 132 is formed in at least a portion of the circumferential direction of the lower edge portion 122. The lower passage 132 is configured to open a section along the circumferential direction of the lower edge portion 122.

[0072] The upper passage 131 and the lower passage 132 constitute the nozzle passage 130 and are arranged radially collinear with the diaphragm passage 230. In detail, the upper passage 131 is arranged above the diaphragm passage 230 and the lower passage 132 is arranged below the diaphragm passage 230.

[0073] In the nozzle lower plate 120 , the fluid channel 121 is provided radially outside the lower recess portion 142 , and the upper end of the fluid channel 121 is covered by the nozzle upper plate 110 .

[0074] like Figure 2 and Figure 5 As shown, the diaphragm lip 220 includes an upper lip protrusion 221 , a lower lip protrusion 222 and a side lip protrusion 223 .

[0075] The lip upper protrusion 221 protrudes upward from the diaphragm lip 220 and extends in the circumferential direction of the diaphragm lip 220, and is arranged between the diaphragm passages 230. Since the upper surface portion of the lip upper protrusion 221 overlaps with the upper surface (i.e., the top surface) of the upper groove portion 141, the lip upper protrusion 221 is fixed to be in close contact with the upper groove portion 141.

[0076] The lip lower protrusion 222 protrudes downward from the diaphragm lip 220 and extends in the circumferential direction of the diaphragm lip 220, and is arranged between the diaphragm passages 230. Since the lower surface portion of the lip lower protrusion 222 overlaps with the lower surface (i.e., the bottom surface) of the lower groove portion 142, the lip lower protrusion 222 is fixed to be in close contact with the lower groove portion 142.

[0077] The lip-side protrusion 223 protrudes radially outward from the diaphragm lip 220 and extends in the circumferential direction of the diaphragm lip 220, and is arranged between the diaphragm passages 230. Since the side surface portion (i.e., the outer circumferential surface) of the lip-side protrusion 223 overlaps with the outer circumferential surface of the lower groove portion 142 (i.e., the inner circumferential surface of the annular boss 123), the lip-side protrusion 223 is fixed in close contact with the lower groove portion 142.

[0078] At the same time, in order to make the fluid flow only through the diaphragm passage 230 and the nozzle passage 130, that is, to prevent the fluid from flowing between the diaphragm lip 220 and the nozzle unit 100 except for the diaphragm passage 230 and the nozzle passage 130, as shown in FIG. Figure 2 and Figure 5 As shown, the nozzle unit 100 includes a flow restriction portion 150 .

[0079] The restricting portion 150 is arranged adjacent to each opposite side of the nozzle passage 130 in the circumferential direction of the nozzle unit 100. The restricting portion 150 is in close contact with the diaphragm lip 220 to form a wall at both the nozzle passage 130 and the diaphragm passage 230, thereby allowing the fluid to flow only through the diaphragm passage 230 and the nozzle passage 130.

[0080] In detail, when the fluid of the upper fluid chamber 40 and the lower fluid chamber 50 moves through the nozzle passage 130 and the diaphragm passage 230, the flow restriction portion 150 blocks the fluid flow between the upper fluid chamber 40 and the lower fluid chamber 50 except for the fluid flow through the nozzle passage 130 and the diaphragm passage 230.

[0081] That is, the flow restriction portion 150 may restrict the fluid to flow only through the nozzle passage 130 and the diaphragm passage 230 , and the fluid may move between the upper fluid chamber 40 and the lower fluid chamber 50 only through the nozzle passage 130 and the diaphragm passage 230 .

[0082] In other words, the restricting portion 150 may restrict the fluid flowing through the nozzle passage 130 and the diaphragm passage 230 from flowing between the diaphragm lip 220 and the nozzle unit 100. The restricting portion 150 may inhibit or prevent the fluid from flowing in the nozzle groove portion 140 along the circumferential direction of the nozzle groove portion 140.

[0083] The flow restriction portion 150 may include an upper restriction protrusion 151 formed on a lower surface portion of the nozzle upper plate 110 and a lower restriction protrusion 152 formed on an upper surface portion of the nozzle lower plate 120 .

[0084] The upper limiting protrusion 151 is arranged adjacent to the upper passage 131 of the nozzle passage 130. The upper limiting protrusion 151 is in close contact with the inner and outer circumferential surfaces of the lip upper protrusion 221. At the same time, the upper limiting protrusion 151 is in close contact with the upper surface of the lip-side protrusion 223 and the upper surface of the central portion of the diaphragm 200 (i.e., the upper surface of the diaphragm body 210).

[0085] The upper restriction protrusion 151 functions as a wall that restricts the flow of fluid on one side of the upper passage 131 and the diaphragm passage 230 .

[0086] Specifically, the upper limiting protrusion 151 may include a first upper limiting protrusion 151 a and a second upper limiting protrusion 151 b .

[0087] The first upper restricting protrusion 151a is formed by protruding radially outward from the upper inner edge portion 111, which is the inner circumferential portion of the nozzle upper plate 110. In other words, the first upper restricting protrusion 151a is formed by protruding from the outer circumferential surface of the upper inner edge portion 111, and is arranged in the upper groove portion 141.

[0088] The second upper restricting protrusion 151b is formed by protruding radially inward from the upper outer edge portion 112 of the nozzle upper plate 110. In other words, the second upper restricting protrusion 151b is formed by protruding from the inner circumferential surface of the upper outer edge portion 112 and is arranged in the upper groove portion 141. Specifically, the upper end portion of the second upper restricting protrusion 151b is arranged in the upper groove portion 141, and the lower end of the second upper restricting protrusion 151b protrudes downward from the upper groove portion 141 and is arranged in the lower groove portion 142.

[0089] The upper outer edge portion 112 is arranged radially outside the upper inner edge portion 111, and the upper groove portion 141 is arranged between the upper inner edge portion 111 and the upper outer edge portion 112. The upper outer edge portion 112 is arranged at the outer circumference of the upper groove portion 141.

[0090] The lower limiting protrusion 152 is arranged adjacent to the lower passage 132. The lower limiting protrusion 152 is in close contact with the inner circumferential surface and the outer circumferential surface of the lip lower protrusion 222, and at the same time, the lower limiting protrusion 152 is in close contact with the lower surface of the lip side protrusion 223 and the lower surface of the central portion of the diaphragm 200 (i.e., the lower surface of the diaphragm body 210).

[0091] The lower restriction protrusion 152 serves as a wall that restricts the flow of fluid on one side of the lower passage 132 and the diaphragm passage 230 .

[0092] In detail, the lower restricting protrusion 152 may include a first lower restricting protrusion 152 a and a second lower restricting protrusion 152 b .

[0093] The first lower restricting protrusion 152a is formed by protruding outward in the radial direction from the lower edge portion 122, which is the inner circumferential portion of the nozzle lower plate 120. In other words, the first lower restricting protrusion 152a is formed by protruding from the outer circumferential surface of the lower edge portion 122, and is arranged in the lower groove portion 142.

[0094] The second lower restricting protrusion 152b is formed by protruding radially inward from the annular boss 123 of the nozzle lower plate 120. In other words, the second lower restricting protrusion 152b is formed by protruding from the inner circumferential surface of the annular boss 123, which is the outer circumferential portion of the lower groove portion 142, and the second lower restricting protrusion 152b is arranged in the lower groove portion 142.

[0095] The annular boss 123 is provided in the nozzle lower plate 120 to be arranged between the lower groove portion 142 and the fluid channel 121 and to extend in the circumferential direction of the nozzle lower plate 120. The annular boss 123 is in close contact with the lower surface of the nozzle upper plate 110 to block the flow of fluid.

[0096] In addition, the upper and lower limiting protrusions 151 and 152 may serve to support the membrane lip 220 disposed in the nozzle groove portion 140 .

[0097] At the same time, if Figure 7 As shown, the radial width of the nozzle groove portion 140 is greater than the radial width of the membrane lip 220. In detail, the radial width of the nozzle groove portion 140 is greater than the sum of the radial widths of the lip upper protrusion 221 and the radial widths of the lip side protrusion 223.

[0098] In order to support and fix the diaphragm lip 220 arranged in the nozzle groove portion 140, as shown Figure 2 and Figure 6 As shown, the nozzle upper plate 110 has a plurality of upper supporting portions 161 , and the nozzle lower plate 120 has a plurality of lower supporting portions 162 .

[0099] Specifically, the nozzle upper plate 110 has a plurality of upper support portions 161 formed in the lower surface portion of the nozzle upper plate 110 by radially protruding from the upper inner edge portion 111 and the upper outer edge portion 112, and the plurality of upper support portions 161 are arranged at intervals in the circumferential direction in the upper groove portion 141. The nozzle lower plate 120 has a plurality of lower support portions 162 formed in the upper surface portion of the nozzle lower plate 120 by radially protruding from the lower edge portion 122 and the annular boss 123, and the plurality of lower support portions 162 are arranged at intervals in the lower groove portion 142.

[0100] Each upper support portion 161 may include a first upper support protrusion 161 a and a second upper support protrusion 161 b .

[0101] The first upper support protrusion 161a is formed by protruding from the outer circumferential surface of the upper inner edge portion 111 and is in close contact with the upper inner circumferential surface of the diaphragm lip 220. In detail, the first upper support protrusion 161a is in close contact with the inner circumferential surface of the lip upper protrusion 221 and supports the upper portion of the diaphragm lip 220.

[0102] The second upper support protrusion 161b is formed by protruding from the inner circumferential surface of the upper outer edge portion 112 and is in close contact with the upper outer circumferential surface of the diaphragm lip 220. In detail, the second upper support protrusion 161b is in close contact with the outer circumferential surface of the lip upper protrusion 221 and supports the upper portion of the diaphragm lip 220.

[0103] Each of the lower supporting portions 162 may include a first lower supporting protrusion 162 a and a second lower supporting protrusion 162 b .

[0104] The first lower support protrusion 162a is formed by protruding from the outer circumferential surface of the lower edge portion 122 and closely contacts the lower inner circumferential surface of the diaphragm lip 220. In detail, the first lower support protrusion 162a closely contacts the inner circumferential surface of the lip lower protrusion 222 and supports the lower portion of the diaphragm lip 220.

[0105] The second lower support protrusion 162b is formed by protruding from the inner circumferential surface of the annular boss 123 and is in close contact with the lower outer circumferential surface of the diaphragm lip 220. In detail, the second lower support protrusion 162b is in close contact with the outer circumferential surface of the lip lower protrusion 222 and supports the lower portion of the diaphragm lip 220.

[0106] The upper support protrusions 161a, 161b and the lower support protrusions 162a, 162b can adjust the contact area with the diaphragm lip 220 by changing their number or shape. For example, the nozzle upper plate 110 can have two upper support protrusions 161a and 161b, and the nozzle lower plate 120 can have two lower support protrusions 162a and 162b (refer to Figure 10 ).

[0107] Since the diaphragm lip 220 is supported by the upper support protrusions 161a and 161b and the lower support protrusions 162a and 162b, the contact area between the nozzle unit 100 and the diaphragm lip 220 can be reduced. Therefore, friction noise caused by vibration of the diaphragm 200 can be reduced.

[0108] like Figure 7 As shown, in the section without the upper support portion 161 and the lower support portion 162 , the inner and outer circumferential surfaces of the lip upper protrusion 221 and the inner and outer circumferential surfaces of the lip lower protrusion 222 do not contact the nozzle upper plate 110 and the nozzle lower plate 120 .

[0109] The upper and lower support protrusions 161a and 161b and 162a and 162b may be applied to the diaphragm lip 220 instead of the nozzle unit 100. In detail, the diaphragm lip 220 may include support protrusions that perform the same function as the upper and lower support protrusions 161a and 161b and 162a and 162b.

[0110] At the same time, if Figure 12A As shown, the upper adjustment protrusion 211 and the lower adjustment protrusion 212 may be formed by protruding from an edge portion at one side of the diaphragm body 210 arranged radially collinear with the diaphragm passage 230 .

[0111] The upper adjustment protrusion 211 is provided on the upper surface portion of the diaphragm body 210, and the lower adjustment protrusion 212 is provided on the lower surface portion of the diaphragm body 210. This reduces the vertical distance between the diaphragm body 210 and the nozzle upper plate 110, and the vertical distance between the diaphragm body 210 and the nozzle lower plate 120. When the vertical distance is reduced as described above, the cross-sectional area of ​​the nozzle passage 130 through which the fluid passes can be reduced, thereby relatively lowering the frequency band for reducing vibration.

[0112] like Figure 12B As shown, the side adjustment protrusion 213 may be formed by protruding from a circumferential surface at one side of the diaphragm body 210 arranged radially collinear with the diaphragm passage 230 .

[0113] When the side adjustment protrusion 213 is formed by protruding from the circumferential surface of the diaphragm body 210 toward the diaphragm passage 230 , a moving path of the fluid passing through the diaphragm passage 230 may be lengthened.

[0114] like Figure 12C As shown, an adjustment groove 214 may be formed on a circumferential surface at one side of the diaphragm body 210 arranged radially collinear with the diaphragm passage 230 .

[0115] The adjustment groove 214 is a portion radially recessed from the circumferential surface of the diaphragm body 210. The flow path of the fluid passing through the diaphragm passage 230 can be shortened based on the radial width of the adjustment groove 214. Therefore, the frequency band for reducing vibration can be relatively increased.

[0116] Attached Figures 13 to 15B 1 is a schematic diagram showing a nozzle unit 100 and a membrane 200 according to a second form of the present invention.

[0117] like Figure 13 and Figure 14 As shown, the annular boss 123 of the nozzle lower plate 120 may have at least one connecting channel 124 positioned radially collinear with the nozzle passage 130 at an upper surface portion of the annular boss 123 .

[0118] The connecting passage 124 connects the nozzle passage 130 and the diaphragm passage 230 to the fluid passage 121, allowing fluid to flow therethrough. Specifically, the connecting passage 124 may be formed to extend in the radial direction of the nozzle lower plate on the upper surface portion of the annular boss 123, and may be formed to have a vertical height that is smaller than the vertical height of the nozzle passage 130. The height of the connecting passage 124 may differ from the height of the nozzle passage 130 by a predetermined value or more.

[0119] The upper end of the connection channel 124 is covered by the nozzle upper plate 110. In other words, the annular boss 123 and the nozzle upper plate 110 together form the connection channel 124.

[0120] like Figure 15A and Figure 15B As shown, the fluid in the upper fluid chamber 40 or the fluid in the lower fluid chamber 50 can move to the fluid channel 121 through the connecting channel 124 .

[0121] When the fluid flows in the connecting passage 124 , that is, when the fluid in the upper fluid chamber 40 or the lower fluid chamber 50 passes through the connecting passage 124 and then flows to the fluid passage 121 , the fluid may absorb the intermediate displacement vibration within the intermediate frequency band.

[0122] like Figure 13 、 Figure 15A and Figure 15B As shown, an edge portion of one side of the diaphragm body 210 is arranged in the nozzle passage 130, and the nozzle groove portion 140 is aligned with the diaphragm passage 230. By adjusting the vertical gap between the upper surface portion of the diaphragm body 210 and the nozzle upper plate 110 and the vertical gap between the lower surface portion of the diaphragm body 210 and the nozzle lower plate 120, the fluid flowing through the connecting channel 124 can absorb vibration within a desired intermediate displacement range.

[0123] When the fluid flows through the connection channel 124, the fluid in the fluid channel 121 resonates to generate a damping force within a predetermined displacement band. Therefore, the dynamic characteristics of the engine mount can be reduced and the vibration transmitted to the vehicle body can be reduced.

[0124] The displacement band and frequency band for reducing vibration may be determined by adjusting the vertical gap between the diaphragm body 210 and the nozzle unit 100 , and the width and length of the connection channel 124 .

[0125] The engine mount of the present invention including the connecting channel 124 can reduce vibrations not only in the low and high displacement bands but also in the intermediate displacement bands, thereby improving ride quality and NVH performance under various road conditions.

[0126] While exemplary embodiments of the present invention have been described in detail above, it should be noted that the terms and expressions used in the specification and claims should not be interpreted as limited to their ordinary meanings or dictionary definitions. Furthermore, the forms described in the specification and the structures shown in the drawings are merely examples, and the scope and spirit of the present invention are not limited to the forms described above. Various modifications and improvements made by those skilled in the art using the basic concepts of the present invention as defined in the appended claims are also included in the scope and spirit of the present invention.

Claims

1. A fluid-sealed engine mount, comprising: a nozzle unit that divides a fluid chamber into an upper fluid chamber and a lower fluid chamber and includes a fluid channel provided for fluid flow between the upper fluid chamber and the lower fluid chamber, wherein the fluid chambers are surrounded by a partition and a diaphragm and are filled with fluid; and a diaphragm arranged at a central portion of the nozzle unit in a radial direction of the nozzle unit and configured to elastically vibrate by a flow of fluid, in: The diaphragm includes a diaphragm lip formed by extending in a circumferential direction of the diaphragm at an edge portion of the diaphragm, and the diaphragm lip is inserted into and fixed to an inner circumferential portion of the nozzle unit, The diaphragm lip includes a diaphragm passage, and the diaphragm passage is provided at at least a portion of the diaphragm lip in a circumferential direction of the diaphragm lip. The nozzle unit includes an annular nozzle groove portion, and the diaphragm lip is inserted and arranged in the annular nozzle groove portion, The nozzle passage is provided in the inner circumference of the annular nozzle groove portion, The nozzle passage and the diaphragm passage together provide a fluid channel for fluid flow, The nozzle unit further comprises: a nozzle lower plate having a lower groove portion on an upper surface portion of the nozzle lower plate; and a nozzle upper plate mounted to the upper surface portion of the nozzle lower plate while being stacked, having an upper groove portion on the lower surface portion of the nozzle upper plate to constitute the annular nozzle groove portion together with the lower groove portion, The upper inner edge portion of the inner circumference portion of the nozzle upper plate has an upper passage adjacent to the upper groove portion, and the lower edge portion of the inner circumference portion of the nozzle lower plate has a lower passage adjacent to the lower groove portion, and the upper passage and the lower passage together constitute the nozzle passage. The diaphragm passage extends along the stacking direction of the nozzle lower plate and the nozzle upper plate and passes through the diaphragm lip. The upper passage is arranged above the diaphragm passage, the lower passage is arranged below the diaphragm passage, and The upper passage is connected to the lower passage through the diaphragm passage, The diaphragm lip further comprises: a lip upper protrusion formed by protruding upward, the lip upper protrusion having an upper surface portion in close contact with an upper surface of the upper groove portion; a lip lower protrusion formed by protruding downward, the lip lower protrusion having a lower surface portion in close contact with a lower surface of the lower groove portion; and a lip-side protrusion formed by protruding outward in a radial direction of the diaphragm lip, the lip-side protrusion having an outer circumferential surface in close contact with the outer circumferential surface of the lower groove portion, The nozzle unit further includes a flow restriction portion disposed adjacent to each opposite side of the nozzle passage in a circumferential direction of the nozzle unit, the flow restriction portion being in close contact with the diaphragm lip to allow fluid to flow only through the diaphragm passage and the nozzle passage, The current limiting part includes: an upper limiting protrusion formed on a lower surface portion of the nozzle upper plate and arranged adjacent to the upper passage, wherein the upper limiting protrusion is in close contact with the inner and outer circumferential surfaces of the lip upper protrusion and is also in close contact with the upper surface of the lip side protrusion and the upper surface of the central portion of the diaphragm; and a lower limiting protrusion formed on an upper surface portion of the nozzle lower plate and arranged adjacent to the lower passage, wherein the lower limiting protrusion is in close contact with the inner circumferential surface and the outer circumferential surface of the lip lower protrusion, and is also in close contact with the lower surface of the lip side protrusion and the lower surface of the central portion of the diaphragm.

2. The fluid-sealed engine mount according to claim 1, wherein: The diaphragm passage is arranged to be collinear with the nozzle passage based on a radial direction of the diaphragm.

3. The fluid-sealed engine mount according to claim 1, wherein: The nozzle upper plate includes a plurality of upper support portions in the upper groove portion, the plurality of upper support portions being arranged to be spaced apart from each other in a circumferential direction of the upper groove portion, Each of the plurality of upper support portions comprises: a first upper support protrusion formed by protruding from the outer circumferential surface of the upper inner edge portion and positioned in close contact with the inner circumferential surface of the lip upper protrusion; and A second upper support protrusion is formed by protruding from an inner circumferential surface of an upper outer edge portion disposed on an outer circumference of the upper groove portion and is positioned in close contact with an outer circumferential surface of the lip upper protrusion.

4. The fluid-sealed engine mount according to claim 1, wherein: The nozzle lower plate includes a plurality of lower support portions in the lower groove portion, the plurality of lower support portions being arranged to be spaced apart from each other along a circumferential direction of the lower groove portion, Each of the plurality of lower support portions comprises: a first lower supporting protrusion formed by protruding from an outer circumferential surface of the lower edge portion and positioned in close contact with an inner circumferential surface of the lip lower protrusion; and A second lower supporting protrusion is formed by protruding from an inner circumferential surface of an annular boss which is an outer circumferential portion of the lower groove portion, and is positioned to be in close contact with an outer circumferential surface of the lip lower protrusion.

5. The fluid-sealed engine mount according to claim 3, wherein: The radial width of the annular nozzle groove portion is greater than the radial width of the diaphragm lip.

6. The fluid-sealed engine mount of claim 1, wherein: The nozzle lower plate includes an annular boss in close contact with the lower surface portion of the nozzle upper plate. The annular boss includes a connecting channel, and the connecting channel is arranged on the same straight line as the nozzle passage along the radial direction of the nozzle lower plate on the upper surface portion of the annular boss, The connecting channel is configured to fluidly connect the nozzle passage to a fluid channel.

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