Hydraulic suspension for a vehicle

Abstract

A hydraulic mount for a vehicle configured to control and dampen behavior of a motor mounted on a vehicle body. The hydraulic mount includes an inner tube, a main rubber body molded on an outer circumferential surface of the inner tube having an upper front liquid chamber and an upper rear liquid chamber and a lower front liquid chamber and a lower rear liquid chamber, and an outer tube fitted to an outer circumferential surface of the main rubber body to seal each liquid chamber, wherein the main rubber body includes a first flow path connecting the upper front liquid chamber and the lower rear liquid chamber filled with a fluid such that the fluid is movable therebetween, and a second flow path connecting the upper rear liquid chamber and the lower front liquid chamber filled with the fluid such that the fluid is movable therebetween.

Description

Technical Field

[0001] This invention relates to a hydraulic mount for a vehicle, and more specifically, to a hydraulic mount configured to control and dampen the performance of an electric motor mounted on a vehicle. Background Technology

[0002] Recently, research and development of electric vehicles has continued due to their environmentally friendly characteristics. These electric vehicles are driven by electric motors instead of engines, and the motors are powered by rechargeable batteries.

[0003] Electric vehicles typically use bushing-type rubber mounts instead of hydraulic suspensions because the motor module, which includes the motor and power electronics, weighs less than a conventional engine.

[0004] However, the bushing-type rubber bearings have very low axial characteristics due to their shape limitations, thus increasing the axial performance of the motor module. Therefore, when determining the positions of multiple rubber bearings for mounting the motor module on the vehicle, these rubber bearings are designed to be offset from each other based on their respective axial directions.

[0005] However, when the motor module is mounted on a vehicle based on a three-point mounting design, the motor module's behavior may increase because the arrangement of these rubber mounts is unfavorable to damping the axial behavior of the motor module. Therefore, aftershock issues may increase when driving on uneven roads.

[0006] Furthermore, during driving, a typical gasoline vehicle (with the engine located at the front) exhibits vertical movement at its front. In contrast, an electric vehicle exhibits vertical movement at both the front and rear during driving because its motor module is physically mounted on both the front and rear wheel sides.

[0007] Therefore, the problem with electric vehicles is that vibrations associated with shaking become severe when driving on flat roads.

[0008] The above content is intended only to help understand the background of the present invention and does not mean that it falls within the scope of related technologies known to those skilled in the art. Summary of the Invention

[0009] Therefore, the present invention proposes a hydraulic suspension with improved damping characteristics in both the axial and vertical directions.

[0010] According to the present invention, a hydraulic mount for a vehicle is provided. The hydraulic mount may include: an inner tube; a main rubber body molded on the outer peripheral surface of the inner tube, and including an upper front liquid chamber and an upper rear liquid chamber disposed on the upper part of the main rubber body in a longitudinal direction, and a lower front liquid chamber and a lower rear liquid chamber disposed on the lower part of the main rubber body in a longitudinal direction; and an outer tube fitted onto the outer peripheral surface of the main rubber body to seal the liquid chambers. The main rubber body may include: a first flow path connecting the upper front liquid chamber and the lower rear liquid chamber filled with fluid, such that fluid can move between them; and a second flow path connecting the upper rear liquid chamber and the lower front liquid chamber filled with fluid, such that fluid can move between them.

[0011] The first flow path can be set between the upper front liquid chamber and the lower rear liquid chamber, and the second flow path can be set between the upper rear liquid chamber and the lower front liquid chamber. The first flow path and the second flow path can extend obliquely relative to the axial direction of the main rubber body.

[0012] The upper front liquid chamber and the lower rear liquid chamber can be located on different circumferences of the main rubber body, and the upper rear liquid chamber and the lower front liquid chamber can also be located on different circumferences of the main rubber body.

[0013] The upper front liquid chamber and the lower front liquid chamber can be located on the same circumference of the main rubber body, and the upper rear liquid chamber and the lower rear liquid chamber can also be located on the same circumference of the main rubber body.

[0014] The upper front liquid chamber can be located in front of the upper rear liquid chamber, and the lower front liquid chamber can be located in front of the lower rear liquid chamber.

[0015] The main rubber body may include: an upper intermediate bridge disposed between an upper front liquid chamber and an upper rear liquid chamber to separate the upper front liquid chamber and the upper rear liquid chamber; and a lower intermediate bridge disposed between a lower front liquid chamber and a lower rear liquid chamber to separate the lower front liquid chamber and the lower rear liquid chamber.

[0016] The upper intermediate bridge can separate the upper front liquid chamber and the upper rear liquid chamber while in contact with the outer tube, and the lower intermediate bridge can separate the lower front liquid chamber and the lower rear liquid chamber while in contact with the outer tube.

[0017] The upper intermediate bridge can contact the outer tube and has a curved outer end, and its outer end can slide while in contact with the outer tube in response to an axial external force applied to the inner tube. The lower intermediate bridge can contact the outer tube and has a curved outer end, and its outer end can slide while in contact with the outer tube in response to an axial external force applied to the inner tube.

[0018] The outer end of the upper intermediate bridge can straighten or bend further in response to a vertical external force applied to the inner tube to maintain contact with the outer tube. The outer end of the lower intermediate bridge can straighten or bend further in response to a vertical external force applied to the inner tube to maintain contact with the outer tube.

[0019] When the outer end of the upper middle bridge straightens, the outer end of the lower middle bridge can be further bent. When the outer end of the upper middle bridge is further bent, the outer end of the lower middle bridge can straighten.

[0020] The upper intermediate bridge can be biased in one direction relative to the axial direction while gradually tapering outward in the radial direction of the main rubber body, and the lower intermediate bridge can be biased in one direction relative to the axial direction while gradually tapering outward in the radial direction of the main rubber body.

[0021] The hydraulic suspension may also include an intermediate tube coaxially arranged with the inner tube. The main rubber body may be molded from the outer peripheral surface of the inner tube to the outer peripheral surface of the outer tube to cover the outer peripheral surface of the intermediate tube. Each of the first flow path and the second flow path may include a groove provided on the outer peripheral surface of the main rubber body and sealed by the outer tube.

[0022] The intermediate tube may include an upper open area and a lower open area. The upper intermediate bridge can contact the outer tube through the upper open area, and the lower intermediate bridge can contact the outer tube through the lower open area.

[0023] The intermediate tube may include: a front stepped portion disposed in front of the upper opening region and the lower opening region, and forming a step relative to the center portion of the intermediate tube; and a rear stepped portion disposed behind the upper opening region and the lower opening region, and forming a step relative to the center portion of the intermediate tube.

[0024] The main rubber body may include: an upper front axle adjacent to the upper front liquid chamber and fixed to the front step portion of the intermediate tube; an upper rear axle adjacent to the upper rear liquid chamber and fixed to the rear step portion of the intermediate tube; a lower front axle adjacent to the lower front liquid chamber and fixed to the front step portion of the intermediate tube; and a lower rear axle adjacent to the lower rear liquid chamber and fixed to the rear step portion of the intermediate tube.

[0025] The first flow path may include: a first upper flow path adjacent to and extending radially from the upper front liquid chamber; a first lower flow path adjacent to and extending radially from the lower rear liquid chamber; and a first intermediate flow path disposed between the first upper flow path and the first lower flow path to connect the first upper flow path and the first lower flow path, and extending obliquely relative to the axial direction of the main rubber body.

[0026] The second flow path may include: a second upper flow path that is adjacent to and extends radially from the upper rear liquid chamber; a second lower flow path that is adjacent to and extends radially from the lower front liquid chamber; and a second intermediate flow path that is disposed between the second upper flow path and the second lower flow path to connect the second upper flow path and the second lower flow path, and extends obliquely relative to the axial direction of the main rubber body.

[0027] The main rubber body may include: a first bypass flow path connecting the upper rear liquid chamber and the first flow path, allowing fluid to move between them; a second bypass flow path connecting the upper front liquid chamber and the second flow path, allowing fluid to move between them; a first rubber membrane disposed in the first bypass flow path to prevent fluid flow between the first bypass flow path and the first flow path, and configured to allow fluid to pass through when the first rubber membrane is selectively folded toward the first bypass flow path by fluid pressure present in the first flow path; and a second rubber membrane disposed in the second bypass flow path to prevent fluid flow between the second bypass flow path and the second flow path, and configured to allow fluid to pass through when the second rubber membrane is selectively folded toward the second bypass flow path by fluid pressure present in the second bypass flow path.

[0028] The first bypass flow path connects the first lower flow path and the upper rear liquid chamber, allowing fluid to move between them and extend in the circumferential direction of the main rubber body. The second bypass flow path connects the second lower flow path and the upper front liquid chamber, allowing fluid to move between them and extend in the circumferential direction of the main rubber body.

[0029] The hydraulic suspension may also include an intermediate plate located on the outer circumferential surface of the inner tube, wherein the intermediate plate includes an upper intermediate plate disposed in the upper intermediate bridge and a lower intermediate plate disposed in the lower intermediate bridge.

[0030] According to embodiments of the present invention, the following main effects can be provided.

[0031] First, it can improve axial damping characteristics, thus enabling control of the axial behavior of the motor module and reducing aftershocks caused by the axial behavior of the motor module.

[0032] Secondly, it can improve vertical damping characteristics, thereby reducing the continuous vibration applied when driving on a flat road. Attached Figure Description

[0033] The above and other objects, features and advantages of the invention will become clearer from the following detailed description, taken in conjunction with the accompanying drawings, wherein:

[0034] Figure 1This is an exploded perspective view showing a hydraulic suspension according to an embodiment of the present invention;

[0035] Figure 2A and 2B This is a partial cross-sectional view showing a hydraulic suspension according to an embodiment of the present invention;

[0036] Figure 3A and 3B This is a view showing a hydraulic suspension according to an embodiment of the present invention, with the outer tube omitted;

[0037] Figure 4A and 4B This is a view illustrating a portion of the manufacturing process of a hydraulic suspension according to an embodiment of the present invention;

[0038] Figure 5 This is a cross-sectional view showing a hydraulic suspension according to an embodiment of the present invention;

[0039] Figure 6 This is a view illustrating a portion of the manufacturing process of a hydraulic suspension according to an embodiment of the present invention;

[0040] Figures 7A to 8B This is a view showing the operating state when an axial external force is applied to the hydraulic suspension according to an embodiment of the present invention;

[0041] Figure 9A and 9B This is a view showing the operating state when a downward external force is applied to the hydraulic suspension according to an embodiment of the present invention;

[0042] Figure 10A and 10B This is a view showing the operating state when an upward external force is applied to the hydraulic suspension according to an embodiment of the present invention;

[0043] Figure 11 and 12 This is a view showing a hydraulic suspension with the outer tube omitted, according to another embodiment of the invention;

[0044] Figures 13A to 14B This is a view showing the operating state of a hydraulic suspension according to another embodiment of the present invention;

[0045] Figure 15 This is a view showing a hydraulic suspension with the outer tube omitted, according to another embodiment of the invention;

[0046] Figure 16 This is a view illustrating a hydraulic suspension according to another embodiment of the present invention;

[0047] Figure 17This is a view showing the inner tube and intermediate plate of a hydraulically mounted suspension according to another embodiment of the invention; and

[0048] Figure 18 and 19 (Related Art) is a view showing a bushing-type rubber bearing of the related art. Detailed Implementation

[0049] It should be understood that the term "vehicle" or "of a vehicle" or other similar terms as used herein generally includes motor vehicles, such as passenger cars including sport utility vehicles (SUVs), public vehicles, trucks, various commercial vehicles, ships including various vessels and vessels, aircraft, etc., and includes hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, hydrogen-powered vehicles, and other alternative fuel vehicles (e.g., fuels derived from resources other than petroleum). As described herein, a hybrid vehicle is a vehicle having two or more power sources, such as a gasoline-powered vehicle and an electric vehicle.

[0050] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used herein, unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “the” are also intended to include the plural forms. It should be further understood that, when used in this specification, the terms “comprises” and / or “comprising” specify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or combinations thereof. As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items. Throughout this specification, unless explicitly stated to the contrary, the word “comprise” and variations such as “comprises” or “comprising” are to be understood as implying the inclusion of the stated elements, but not excluding any other elements. Furthermore, the terms “unit,” “-er,” “-or,” and “module” described in the specification refer to a unit for performing at least one function and operation, and can be implemented by hardware components or software components and combinations thereof.

[0051] Furthermore, the control logic of this invention can be embodied on a non-transitory computer-readable medium containing executable program instructions that are executed by a processor, controller, or the like. Examples of computer-readable media include, but are not limited to, ROM, RAM, optical disc (CD)-ROM, magnetic tape, floppy disk, flash drive, smart card, and optical data storage device. The computer-readable medium can also be distributed across a network-connected computer system, allowing it to be stored and executed in a distributed manner, for example, by a remote information server or a controller area network (CAN).

[0052] In the following description, embodiments of the invention will be illustrated with reference to the accompanying drawings. The illustrations in the drawings are provided to aid in understanding the embodiments of the invention and may differ from actual implementations.

[0053] Furthermore, it should be understood that when an element is described as "connected" or "joined" to another element, it can be "directly connected or joined" to the other element, and also "indirectly connected or joined" to the other element through an intermediary element. In contrast, when an element is described as "directly connected" or "directly joined" to another element, it should be understood that there is no intermediary element. Other expressions describing relationships between elements, such as "between," "directly between," "adjacent to," and "directly adjacent to," should be understood in the same way.

[0054] Figure 18 and 19 (Related Art) is a view showing a bushing-type rubber bearing of the related art.

[0055] The motor module is the device that generates driving force in an electric vehicle. Conventional motor modules in related technologies typically use bushing-type rubber mounts 10 for mounting on the vehicle, such as... Figure 18 and 19 As shown.

[0056] When the motor module is mounted on the vehicle body using a three-point support design, the front center portion, rear left portion, and rear right portion of the motor module can be attached to the vehicle body via rubber brackets. Among these rubber brackets, the one mounted on the front center portion of the motor module is configured such that its axial direction is parallel to the vehicle's longitudinal direction, while the rubber brackets mounted on the left and right rear portions of the motor module are configured such that their axial directions are parallel to the vehicle's transverse direction.

[0057] However, the axial characteristics of rubber bearings are lower than their lateral or vertical characteristics (i.e., characteristics in the vertical direction). Therefore, when rubber bearings are installed on a vehicle body based on the three-point support design described above, the aftershocks that occur when driving on uneven roads, etc., may increase, which is a problem. Since this problem is caused by the shape of the rubber bearing, improvements to the axial characteristics of the rubber bearing are limited.

[0058] Furthermore, because the motor modules of electric vehicles are mounted on the front and rear wheel sides, electric vehicles experience severe vibration problems when driving on level roads.

[0059] The present invention provides a bushing-type hydraulic mount, which has improved characteristics in both the axial direction and the load-bearing direction to overcome the above-mentioned problems.

[0060] This hydraulic mount has a structure that improves its damping characteristics in both the axial and load-bearing directions. When the hydraulic mount is configured so that its axial direction is parallel to the vehicle's longitudinal direction, it can effectively dampen vibrations in both the longitudinal and vertical directions (i.e., up-down directions).

[0061] Therefore, such as Figures 1 to 5 As shown, the hydraulic suspension may include: an inner tube 100; an intermediate tube 200 coaxially arranged with the inner tube 100; a main rubber body 300; and an outer tube 400.

[0062] In the following text, unless otherwise stated, the term "axial direction" may refer to the axial direction of the hydraulic mount, including the inner tube 100, and may be interpreted as having the same meaning as the front-to-rear direction or the longitudinal direction of the vehicle. Furthermore, unless otherwise stated, the term "vertical direction" may refer to the vertical direction of the vehicle or the load-bearing direction of the hydraulic mount. The load-bearing direction refers to the direction in which the load of components attached to the vehicle body is supported by the hydraulic mount. Furthermore, unless otherwise stated, the term "radial direction" may refer to the radial direction of the hydraulic mount, including the inner tube 100, etc.

[0063] like Figure 4AAs shown, the inner tube 100 is configured to be joined to components such as motor modules mounted on the vehicle body. The inner tube 100 has a hollow cylindrical shape and may be made of a metallic material.

[0064] The motor module includes a motor for generating driving force for the electric vehicle and power electronic devices (PEs) configured to supply power to the motor.

[0065] The inner tube 100 can be connected to the motor module via fasteners and can transfer the load of the motor module to the main rubber body 300.

[0066] like Figure 4A and 4B As shown, the intermediate tube 200 is disposed outside the inner tube 100 and coaxial with the inner tube 100. The intermediate tube 200 has a hollow cylindrical shape and may be made of metal. The intermediate tube 200 has an upper opening 210, a lower opening 220, a front step 230, and a rear step 240.

[0067] The upper opening 210 is located at the top of the intermediate tube 200, and the lower opening 220 is located at the bottom of the intermediate tube 200. The upper opening 210 and the lower opening 220 can be arranged symmetrically with respect to the inner tube 100.

[0068] The front step portion 230 is configured to be located in front of the upper opening portion 210 and the lower opening portion 220 in the axial direction, and extends uninterruptedly in the radial direction (circumferential direction) of the intermediate tube 200. For example, the front step portion 230 may extend in an annular shape.

[0069] The rear step portion 240 is arranged to be adjacent to the upper opening portion 210 and the lower opening portion 220 in the axial direction and located behind them, and extends uninterruptedly in the radial direction (circumferential direction) of the intermediate tube 200, and is located behind the front step portion 230.

[0070] The front step portion 230 and the rear step portion 240 are respectively provided at the front and rear of the intermediate tube 200 in the axial direction. The front step portion 230 and the rear step portion 240 protrude outward in the radial direction, extending beyond the center portion of the intermediate tube 200 where the upper opening portion 210 and the lower opening portion 22 are provided.

[0071] In other words, the front step portion 230 and the rear step portion 240 form a step shape from the center portion of the intermediate tube 200. This is to provide arrangement space on the outside of the center portion of the intermediate tube 200, which allows the first flow path 310 and the second flow path 320 of the main rubber body 300 to be disposed therein.

[0072] The main rubber body 300 is formed by vulcanization on the outer peripheral surface of the inner tube 100. Specifically, the main rubber body 300 is fixed between the inner tube 100 and the intermediate tube 200 by molding, and is molded from the outer peripheral surface of the inner tube 100 to the outer peripheral surface of the intermediate tube 200. The main rubber body 300 is molded to cover the outer peripheral surface of the intermediate tube 200 and to surround the intermediate tube 200.

[0073] The main rubber body 300 includes a pair of liquid chambers 331 and 332 disposed on the upper part of the main rubber body 300 in the front-rear direction, and a pair of liquid chambers 333 and 334 disposed on the lower part of the main rubber body 300 in the front-rear direction.

[0074] A pair of liquid chambers 331 and 332 disposed on the upper part of the main rubber body 300 include an upper front liquid chamber 331 and an upper rear liquid chamber 332. A pair of liquid chambers 333 and 334 disposed on the lower part of the main rubber body 300 include a lower front liquid chamber 333 and a lower rear liquid chamber 334.

[0075] Each of the liquid chambers 331, 332, 333, and 334 may have a groove shape formed on the outer peripheral surface of the main rubber body 300. Fluid for damping vibrations transmitted through the inner tube 100 is contained in each of the liquid chambers 331, 332, 333, and 334 in a sealed manner. Since the outer tube 400 is press-fitted to the outer peripheral surface of the main rubber body 300 while being immersed in the fluid, each of the liquid chambers 331, 332, 333, and 334 may be filled with fluid.

[0076] Furthermore, when the outer tube 400 is press-fitted to the outside of the main rubber body 300, each of the liquid chambers 331, 332, 333 and 334 is tightly sealed by the outer tube 400.

[0077] The upper front liquid chamber 331 and the upper rear liquid chamber 332 are disposed in the axial direction and the front-rear direction of the main rubber body 300, respectively. Specifically, the upper front liquid chamber 331 is disposed in front of the upper rear liquid chamber 332.

[0078] The lower front liquid chamber 333 and the lower rear liquid chamber 334 are disposed in the axial direction and the front-rear direction of the main rubber body 300, respectively. Here, the lower front liquid chamber 333 is disposed in front of the lower rear liquid chamber 334.

[0079] Furthermore, the upper front liquid chamber 331 and the lower front liquid chamber 333 are arranged on the same circumference of the main rubber body 300 and are spaced apart by a predetermined distance. The upper rear liquid chamber 332 and the lower rear liquid chamber 334 are arranged on the same circumference of the main rubber body 300 and are spaced apart by a predetermined distance.

[0080] Here, the upper front liquid chamber 331 and the lower rear liquid chamber 334 are disposed on different circumferences of the main rubber body 300, and the upper rear liquid chamber 332 and the lower front liquid chamber 333 are also disposed on different circumferences of the main rubber body 300.

[0081] In addition, the main rubber body 300 includes: a first flow path 310 connecting the upper front liquid chamber 331 and the lower rear liquid chamber 334, through which fluid can flow, and a second flow path 320 connecting the upper rear liquid chamber 332 and the lower front liquid chamber 333, through which fluid can flow.

[0082] The first flow path 310 may have the shape of a groove formed on the outer peripheral surface of the main rubber body 300, and may be disposed between the upper front liquid chamber 331 and the lower rear liquid chamber 334. For example, the first flow path 310 may be disposed on the right side portion of the main rubber body 300.

[0083] The second flow path 320 may have the shape of a groove formed on the outer peripheral surface of the main rubber body 300, and may be disposed between the upper rear liquid chamber 332 and the lower front liquid chamber 333. For example, the second flow path 320 may be disposed on the left side portion of the main rubber body 300.

[0084] Here, one longitudinal end of the first flow path 310 is directly connected to the upper front liquid chamber 331, and the other longitudinal end of the first flow path 310 is directly connected to the lower rear liquid chamber 334. In addition, one longitudinal end of the second flow path 320 is directly connected to the upper rear liquid chamber 332, and the other longitudinal end of the second flow path 320 is directly connected to the lower front liquid chamber 333.

[0085] The first flow path 310 may be formed on the right side of the outer peripheral surface of the main rubber body 300 and extend diagonally, and the second flow path 320 may be formed on the left side of the outer peripheral surface of the main rubber body 300 and extend diagonally. Here, the first flow path 310 and the second flow path 320 may be configured to extend diagonally relative to the axial direction of the main rubber body 300.

[0086] like Figure 3A and 3BAs shown, the first flow path 310 may include a first upper flow path 311, a first lower flow path 312, and a first intermediate flow path 313. The first upper flow path 311 extends in the circumferential direction and is adjacent to the upper front liquid chamber 331; the first lower flow path 312 extends in the circumferential direction and is adjacent to the lower rear liquid chamber 334; and the first intermediate flow path 313 is disposed between the first upper flow path 311 and the first lower flow path 312 to connect the first upper flow path 311 and the first lower flow path 312. The first upper flow path 311 and the first lower flow path 312 extend perpendicular to the axial direction, and the first intermediate flow path 313 extends obliquely relative to the axial direction.

[0087] The second flow path 320 may include a second upper flow path 321, a second lower flow path 322, and a second intermediate flow path 323. The second upper flow path 321 extends in the circumferential direction and is adjacent to the upper rear liquid chamber 332; the second lower flow path 322 extends in the circumferential direction and is adjacent to the lower front liquid chamber 333; and the second intermediate flow path 323 is disposed between the second upper flow path 321 and the second lower flow path 322 to connect the second upper flow path 321 and the second lower flow path 322. Here, the second upper flow path 321 and the second lower flow path 322 extend perpendicular to the axial direction, and the second intermediate flow path 323 extends obliquely relative to the axial direction.

[0088] In addition, the main rubber body 300 includes an upper intermediate bridge 341 and a lower intermediate bridge 342, each of which can be deformed by external force.

[0089] An upper intermediate bridge 341 is disposed between the upper front liquid chamber 331 and the upper rear liquid chamber 332 to separate the upper front liquid chamber 331 and the upper rear liquid chamber 332. A lower intermediate bridge 342 is disposed between the lower front liquid chamber 333 and the lower rear liquid chamber 334 to separate the lower front liquid chamber 333 and the lower rear liquid chamber 334.

[0090] The upper intermediate bridge 341 can divide the upper front liquid chamber 331 and the upper rear liquid chamber 332 into separate independent liquid chambers, and the lower intermediate bridge 342 can divide the lower front liquid chamber 333 and the lower rear liquid chamber 334 into separate independent liquid chambers.

[0091] When the main rubber body 300 is formed on the outer peripheral surface of the inner tube 100, the upper intermediate bridge 341 and the lower intermediate bridge 342 are configured to protrude further outward in the radial direction than the front step portion 230 and the rear step portion 240 of the intermediate tube 200.

[0092] Specifically, the upper intermediate bridge 341 and the lower intermediate bridge 342 extend through the intermediate tube 200 and bend to one side while contacting the outer tube 400. Here, the upper intermediate bridge 341 extends through the upper opening 210 of the intermediate tube 200 to contact the inner circumferential surface of the outer tube 400. The lower intermediate bridge 342 extends through the lower opening 220 of the intermediate tube 200 to contact the inner circumferential surface of the outer tube 400.

[0093] The upper intermediate bridge 341 separates the upper front liquid chamber 331 and the upper rear liquid chamber 332 while contacting the outer pipe 400. The lower intermediate bridge 342 separates the lower front liquid chamber 333 and the lower rear liquid chamber 334 while contacting the outer pipe 400.

[0094] The outer tube 400 can be press-fitted to the outside of the main rubber body 300 via an interference fit, and is configured to surround the main rubber body 300 and the intermediate tube 200. The outer tube 400 can be in close contact with the outer peripheral surface of the main rubber body 300 and can have a cylindrical shape. The outer tube 400 can be connected to the vehicle body. For example, the outer tube 400 can be fixedly connected to the vehicle body via a bracket or the like mounted on a part of the vehicle body.

[0095] like Figure 5 As shown, the outer ends of the upper intermediate bridge 341 and the lower intermediate bridge 342 are in contact with the inner circumferential surface of the outer tube 400. Specifically, the outer end of the upper intermediate bridge 341 in the radial direction is in contact with the upper part of the inner circumferential surface of the outer tube 400, and the outer end of the lower intermediate bridge 342 in the radial direction is in contact with the lower part of the inner circumferential surface of the outer tube 400.

[0096] The outer end of the upper intermediate bridge 341 can be referred to as the upper contact portion 341a, while the outer end of the lower intermediate bridge 342 can be referred to as the lower contact portion 342a. In other words, the upper intermediate bridge 341 may have an upper contact portion 341a at its outer end in the radial direction, while the lower intermediate bridge 342 may have a lower contact portion 342a at its outer end in the radial direction.

[0097] The upper contact portion 341a and the lower contact portion 342a are in contact with the inner circumferential surface of the outer tube 400, and are bent to one side (e.g., forward) in the axial direction. The upper contact portion 341a and the lower contact portion 342a can be moved or deformed in the front-rear direction by external force.

[0098] like Figures 7A to 8BAs shown, when an axial external force is applied to the inner tube 100, the upper contact portion 341a and the lower contact portion 342a slide in the axial direction while in contact with the outer tube 400. When the upper contact portion 341a and the lower contact portion 342a slide in the axial direction by an external force, the volume of the liquid chambers 331, 332, 333 and 334 changes, thereby causing the fluid to flow through the first flow path 310 and the second flow path 320.

[0099] In other words, when an axial external force is applied to the inner tube 100, the intermediate bridges 341 and 342 slide on the inner circumferential surface of the outer tube 400, thereby changing the volume of the liquid chambers 331, 332, 333, and 334. Therefore, the axial behavior of the motor module and the vibration of the motor module can be controlled based on the volume changes of the liquid chambers 331, 332, 333, and 334.

[0100] When an external force causes the inner tube 100 to move backward, the upper contact portion 341a and the lower contact portion 342a slide backward while contacting the inner circumferential surface of the outer tube 400. Conversely, when an external force causes the inner tube 100 to move forward, the upper contact portion 341a and the lower contact portion 342a slide forward while contacting the inner circumferential surface of the outer tube 400.

[0101] When the contact portions 341a and 342a slide backward, the volume of the upper front liquid chamber 331 and the lower front liquid chamber 333 increases, while the volume of the upper rear liquid chamber 332 and the lower rear liquid chamber 334 decreases. Conversely, when the contact portions 341a and 342a slide forward, the volume of the upper front liquid chamber 331 and the lower front liquid chamber 333 decreases, while the volume of the upper rear liquid chamber 332 and the lower rear liquid chamber 334 increases.

[0102] Because the fluid is oil-based, the coefficient of friction of the fluid filling each of the liquid chambers 331, 332, 333, and 334 is low. Therefore, the contact portions 341a and 342a can slide on the surface of the outer tube 400 without friction.

[0103] Furthermore, when the contact portions 341a and 342a slide backward, as Figure 7B As shown, the fluid in the lower rear liquid chamber 334 moves to the upper front liquid chamber 331 through the first flow path 310, and the fluid in the upper rear liquid chamber 332 moves to the lower front liquid chamber 333 through the second flow path 320.

[0104] Conversely, when the contact portions 341a and 342a slide forward, as Figure 8B As shown, the fluid in the upper front liquid chamber 331 moves to the lower rear liquid chamber 334 through the first flow path 310, and the fluid in the lower front liquid chamber 333 moves to the upper rear liquid chamber 332 through the second flow path 320.

[0105] In response to the fluid flowing through the first flow path 310 and the second flow path 320 as described above, the axial behavior of the motor module can be damped.

[0106] In addition, such as Figures 9A to 10B As shown, when a vertical external force is applied to the inner tube 100, the upper intermediate bridge 341 deforms while the upper contact portion 341a remains in contact with the outer tube 400, and the lower intermediate bridge 342 deforms while the lower contact portion 342a remains in contact with the outer tube 400.

[0107] Specifically, when a downward external force is applied to the inner tube 100, the upper contact portion 341a extends further than before the downward external force is applied to the inner tube 100, so as to straighten into a near-linear shape while maintaining contact with the outer tube 400, and the lower contact portion 342a is more curved than before the downward external force is applied to the inner tube 100 while maintaining contact with the outer tube 400. Here, the contact area of ​​the upper contact portion 341a with the outer tube 400 can be reduced, while the contact area of ​​the lower contact portion 342a with the outer tube 400 can be increased. Furthermore, the volumes of the upper front liquid chamber 331 and the upper rear liquid chamber 332 can be increased, while the volumes of the lower front liquid chamber 333 and the lower rear liquid chamber 334 can be decreased.

[0108] Conversely, when an upward external force is applied to the inner tube 100, the lower contact portion 342a extends further than before the upward external force is applied to the inner tube 100, so as to straighten into a near-linear shape while maintaining contact with the outer tube 400, and the upper contact portion 341a is more curved than before the upward external force is applied to the inner tube 100 while maintaining contact with the outer tube 400. Here, the area of ​​the lower contact portion 342a in contact with the outer tube 400 can be reduced, while the area of ​​the upper contact portion 341a in contact with the outer tube 400 can be increased. Furthermore, the volumes of the upper front liquid chamber 331 and the upper rear liquid chamber 332 can be reduced, while the volumes of the lower front liquid chamber 333 and the lower rear liquid chamber 334 can be increased.

[0109] When a downward external force is applied to the inner tube 100, such as Figure 9B As shown, the fluid in the lower rear liquid chamber 334 moves to the upper front liquid chamber 331 through the first flow path 310, while the fluid in the lower front liquid chamber 333 moves to the upper rear liquid chamber 332 through the second flow path 320. Conversely, when an upward external force is applied to the inner tube 100, as... Figure 10B As shown, the fluid in the upper front liquid chamber 331 moves to the lower rear liquid chamber 334 through the first flow path 310, while the fluid in the upper rear liquid chamber 332 moves to the lower front liquid chamber 333 through the second flow path 320.

[0110] In response to the fluid flowing through the first flow path 310 and the second flow path 320 as described above, the behavior of the motor module in the vertical direction can be damped.

[0111] like Figure 5 As shown, the main rubber body 300 includes front axles 343, 345 and rear axles 344, 346 fixed to the intermediate tube 200 and adjacent to the liquid chambers 331, 332, 333 and 334. When an axial or vertical external force is applied to the inner tube 100, the front axles 343, 345 and the rear axles 344, 346 cause the volume of the liquid chambers 331, 332, 333 and 334 to change according to the state of the upper intermediate axle 341 and the lower intermediate axle 342.

[0112] Specifically, the main rubber body 300 includes an upper front axle 343, an upper rear axle 344, a lower front axle 345, and a lower rear axle 346 fixed to the intermediate tube 200.

[0113] The upper front axle 343 is located in front of and adjacent to the upper front liquid chamber 331, and its outer end is fixed to the front step portion 230 of the intermediate tube 200.

[0114] The upper rear axle 344 is located at the rear of and adjacent to the upper rear liquid chamber 332, and its outer end is fixed to the rear step portion 240 of the intermediate tube 200.

[0115] The lower front axle 345 is located in front of and adjacent to the lower front liquid chamber 333, and its outer end is fixed to the front step portion 230 of the intermediate tube 200.

[0116] The lower rear axle 346 is located at the rear of and adjacent to the lower rear liquid chamber 334, and its outer end is fixed to the rear step portion 240 of the intermediate tube 200.

[0117] Here, the front axles 343, 345 and the rear axles 344, 346 can be configured to surround the outer peripheral surface of the front step portion 230 and the outer peripheral surface of the rear step portion 240 to seal the main rubber body 300 and the outer tube 400.

[0118] Furthermore, the height of the upper front axle 343 and the height of the upper rear axle 344 are both lower than the height of the upper intermediate axle 341 in the radial direction. That is, the radial height of each of the upper front axle 343 and the upper rear axle 344 is lower than the radial height of the upper intermediate axle 341.

[0119] Furthermore, the height of the lower front axle 345 and the height of the lower rear axle 346 are both lower than the height of the lower intermediate axle 342 in the radial direction. That is, the radial height of each of the lower front axle 345 and the lower rear axle 346 is lower than the radial height of the lower intermediate axle 342.

[0120] In addition, the upper intermediate bridge 341 and the lower intermediate bridge 342 may be configured to taper outward in the radial direction to improve the durability, connectivity and assemblability of the hydraulic suspension.

[0121] While each intermediate bridge 341, 342 gradually tapers outward in the radial direction, the axial thickness of each of the intermediate bridges 341, 342 decreases. Here, each intermediate bridge 341, 342 may be tapered to one side in the axial direction. Specifically, each intermediate bridge 341, 342 may have a slope on its front or rear surface in the axial direction.

[0122] like Figure 6 As shown, since the intermediate bridges 341 and 342 are tapered, when the outer tube 400 is installed on the outside of the main rubber body 300 in the axial direction, the outer end of each intermediate bridge 341 and 342 bends and contacts the outer tube 400, and the front liquid chambers 331 and 333 and the rear liquid chambers 332 and 334 are separated by the intermediate bridges 341 and 342.

[0123] In other words, since the intermediate bridges 341 and 342 are tapered, the outer tube 400 compresses the intermediate bridges 341 and 342 radially inward while being assembled to the outside of the main rubber body 300. When the assembly of the outer tube 400 and the main rubber body 300 is completed, the outer ends of the intermediate bridges 341 and 342 are in close contact with the inner circumferential surface of the outer tube 400.

[0124] In addition, such as Figure 11 and 12 As shown, the main rubber body 300 may also include bypass flow paths 351, 352 and rubber membranes 353, 354 to selectively reduce the fluid pressure occurring in the first flow path 310 and the second flow path 320.

[0125] Specifically, the main rubber body 300 may further include a first bypass flow path 351 and a second bypass flow path 352 having grooves formed on their outer surfaces, and a first rubber membrane 353 and a second rubber membrane 354 respectively disposed on the bypass flow paths 351 and 352.

[0126] The first bypass flow path 351 is configured to connect the upper rear liquid chamber 332 and the first flow path 310 to allow fluid to move between them, and can extend in the circumferential direction of the main rubber body 300. Specifically, the first bypass flow path 351 can connect the upper rear liquid chamber 332 and the first lower flow path 312 to allow fluid to move between them.

[0127] The second bypass flow path 352 is configured to connect the upper front liquid chamber 331 and the second flow path 320 to allow fluid to move between them, and can extend in the circumferential direction of the main rubber body 300. Specifically, the second bypass flow path 352 can connect the upper front liquid chamber 331 and the second lower flow path 322 to allow fluid to move between them.

[0128] The first bypass flow path 351 and the second bypass flow path 352 may be configured to extend linearly in the circumferential direction relative to the main rubber body 300. The first bypass flow path 351 and the second bypass flow path 352 may have the same width and depth as the first flow path 310 and the second flow path 320.

[0129] like Figure 13A and 13B As shown, the first rubber diaphragm 353 is configured to selectively fold due to fluid pressure in the first flow path 310. The first rubber diaphragm 353 is disposed in the first bypass flow path 351 to control the fluid flow between the first bypass flow path 351 and the first flow path 310. For example, the first rubber diaphragm 353 may be disposed at the junction between the first bypass flow path 351 and the first flow path 310 (i.e., the fluid inlet of the first bypass flow path).

[0130] The inner distal end of the first rubber diaphragm 353 in the radial direction is integrally molded and fixed to the bottom surface of the first bypass flow path 351, so that the fluid inlet of the first bypass flow path 351 can be opened when the first rubber diaphragm 353 is folded by the fluid flow. In addition, the outer distal end of the first rubber diaphragm 353 in the radial direction remains in contact with the inner circumferential surface of the outer tube 400, so that the fluid inlet of the first bypass flow path 351 can be closed when the first rubber diaphragm 353 is not folded by the fluid flow.

[0131] When the first rubber diaphragm 353 is held in the upright position and is not folded by fluid pressure, the fluid inlet of the first bypass flow path 351 can be closed to block the fluid flow between the first bypass flow path 351 and the first flow path 310. When the first rubber diaphragm 353 is held in the upright position, no fluid flow occurs from the first flow path 310 to the first bypass flow path 351.

[0132] like Figure 13B As shown, when the first rubber membrane 353 folds towards the first bypass flow path 351 due to the fluid pressure in the first flow path 310, the first rubber membrane 353 allows fluid to move between the first bypass flow path 351 and the first flow path 310. When the first rubber membrane 353 is folded, fluid flow occurs from the first flow path 310 to the first bypass flow path 351, and the fluid pressure in the first flow path 310 is relatively reduced.

[0133] In other words, when the first rubber membrane 353 folds toward the first bypass flow path 351, the fluid in the first flow path 310 can flow through the area occupied by the first rubber membrane 353 before the first rubber membrane 353 folds, and thus flow toward the first bypass flow path 351.

[0134] like Figure 14A and 14B As shown, the second rubber diaphragm 354 is configured to selectively fold due to fluid pressure in the second flow path 320. Furthermore, the second rubber diaphragm 354 may be disposed in the second bypass flow path 352 to control fluid flow between the second bypass flow path 352 and the second flow path 320. For example, the second rubber diaphragm 354 may be disposed at the junction between the second bypass flow path 352 and the second flow path 320 (i.e., the fluid inlet of the second bypass flow path).

[0135] The inner distal end of the second rubber diaphragm 354 in the radial direction is integrally molded and fixed to the bottom surface of the second bypass flow path 352, so that the fluid inlet of the second bypass flow path 352 can be opened when the second rubber diaphragm 354 is folded by the fluid flow. In addition, the outer distal end of the second rubber diaphragm 354 in the radial direction remains in contact with the inner circumferential surface of the outer tube 400, so that the fluid inlet of the second bypass flow path 352 can be closed when the second rubber diaphragm 354 is not folded by the fluid flow.

[0136] When the second rubber diaphragm 354 is held in the upright position and not folded by fluid pressure, the second rubber diaphragm 354 can close the fluid inlet of the second bypass flow path 352, thereby blocking the fluid flow between the second bypass flow path 352 and the second flow path 320. When the second rubber diaphragm 354 is held in the upright position, no fluid flow occurs from the second flow path 320 to the second bypass flow path 352.

[0137] When the second rubber membrane 354 folds towards the second bypass flow path 352 due to the fluid pressure in the second flow path 320, the second rubber membrane 354 allows fluid to move between the second bypass flow path 352 and the second flow path 320. When the second rubber membrane 354 folds, fluid flow occurs from the second flow path 320 to the second bypass flow path 352, and the fluid pressure in the second flow path 320 relatively decreases.

[0138] In other words, when the second rubber membrane 354 folds toward the second bypass flow path 352, the fluid in the second flow path 320 can flow through the area previously occupied by the second rubber membrane 354, and thus flow toward the second bypass flow path 352.

[0139] Furthermore, the first rubber diaphragm 353 and the second rubber diaphragm 354 can be disposed at locations other than the fluid inlets of the bypass flow paths 351 and 352. The first rubber diaphragm 353 can be disposed at any location in the first bypass flow path 351, provided that the first rubber diaphragm 353 allows or prevents fluid from moving through the first bypass flow path 351 from the first flow path 310 to the upper rear liquid chamber 332. The second rubber diaphragm 354 can be disposed at any location in the second bypass flow path 352, provided that the second rubber diaphragm 354 allows or prevents fluid from moving through the second bypass flow path 352 from the second flow path 320 to the upper front liquid chamber 331.

[0140] When the fluid pressure in the first flow path 310 and the second flow path 320 increases to high pressure in response to a relatively large external force load input to the inner tube 100, the first rubber diaphragm 353 and the second rubber diaphragm 354 can be folded to allow the fluid in the first flow path 310 to bypass to the upper rear liquid chamber 332, and to allow the fluid in the second flow path 320 to bypass to the upper front liquid chamber 331. Therefore, flow connection of the fluids can be prevented and the durability of the main rubber body 300 can be improved.

[0141] Furthermore, the range of damping frequencies can be tuned by changing the lengths of the first flow path 310 and the second flow path 320. Specifically, as the lengths of the first flow path 310 and the second flow path 320 increase, the range of damping frequencies expands. For example, the length of the second flow path 320 can be changed in various ways in response to changes in the shape of the second flow path 320, such as... Figure 5 As shown. The length of the first flow path 310 can also be changed, just like the length of the second flow path 320. The range of damping frequencies is tuned based on the changes in the lengths of the first flow path 310 and the second flow path 320.

[0142] In addition, such as Figure 16 As shown, intermediate plates 111 and 112 may be provided on the outer circumferential surface of the inner tube 100. The intermediate plates 111 and 112 may include an upper intermediate plate 111 provided in the upper intermediate bridge 341 and a lower intermediate plate 112 provided in the lower intermediate bridge 342.

[0143] When intermediate bridges 341 and 342 are moved by external forces, intermediate plates 111 and 112 can improve the behavioral accuracy of intermediate bridges 341 and 342. Since intermediate plates 111 and 112 enable intermediate bridges 341 and 342 to work more precisely, the damping effect on the hydraulic suspension can be improved.

[0144] These intermediate plates 111, 112 can be integrally formed with the inner tube 100, or as follows: Figure 17As shown, it can be provided as a separate component press-fitted to the inner tube 100. The intermediate plates 111 and 112 can be made of aluminum (Al), steel, plastic, etc.

[0145] The hydraulic suspension with the above-described structure can provide the following effects.

[0146] First, it can increase axial damping characteristics, thereby enabling control of the axial behavior of the motor module. Therefore, it can reduce aftershocks caused by the axial behavior of the motor module. For example, it can reduce aftershocks occurring during sudden starts or when driving on uneven roads.

[0147] Secondly, it can improve the damping characteristics in the load-bearing direction (i.e., the vertical direction supporting the motor module), thereby reducing the continuous vibration when driving on a flat road.

[0148] Third, all liquid chambers, flow paths, and bridges used to achieve axial and vertical damping characteristics are integrally integrated with the main rubber body 300. Therefore, the increase in cost and weight can be minimized compared to rubber supports of related technologies.

[0149] Fourth, when the main rubber body 300 includes bypass flow paths 351, 352 and rubber membranes 353, 354, even when a large load is applied to the inner tube 100, the fluid pressure flowing through the first flow path 310 and the second flow path 320 can be adjusted, thereby improving durability and connectivity.

[0150] Although specific embodiments of the invention have been described in detail above, the terms or words used herein and in the appended claims should not be construed as limited to their ordinary and dictionary meanings. Furthermore, since the embodiments described herein and the features shown in the accompanying drawings are merely examples of the invention, the scope of the invention is not limited to the foregoing embodiments. Those skilled in the art can make various modifications and improvements based on the principles of the invention as defined in the appended claims without departing from the scope of the invention as defined in the appended claims.

Claims

1. A hydraulic mount for a vehicle, the hydraulic mount comprising: Inner tube; A main rubber body molded on the outer circumferential surface of the inner tube includes: an upper front liquid chamber and an upper rear liquid chamber disposed at the upper part of the main rubber body in the front-rear direction, and a lower front liquid chamber and a lower rear liquid chamber disposed at the lower part of the main rubber body in the front-rear direction; and The outer tube is assembled onto the outer peripheral surface of the main rubber body to seal each liquid chamber. The main rubber body includes: A first flow path connects the upper front liquid chamber and the lower rear liquid chamber, which are filled with fluid, so that the fluid can move between the two. The second flow path connects the upper rear liquid chamber and the lower front liquid chamber, which are filled with fluid, so that the fluid can move between the two. An upper intermediate bridge is disposed between the upper front liquid chamber and the upper rear liquid chamber to separate the upper front liquid chamber and the upper rear liquid chamber; and A lower intermediate bridge is disposed between the lower front liquid chamber and the lower rear liquid chamber to separate the lower front liquid chamber and the lower rear liquid chamber. The upper intermediate bridge, while contacting the outer tube, separates the upper front liquid chamber and the upper rear liquid chamber. The lower intermediate bridge, while contacting the outer tube, separates the lower front liquid chamber and the lower rear liquid chamber. The upper intermediate bridge contacts the outer tube and has a bent outer end. In response to an axial external force applied to the inner tube, the outer end of the upper intermediate bridge slides while in contact with the outer tube. The lower intermediate bridge contacts the outer tube and has a curved outer end, and in response to an axial external force applied to the inner tube, the outer end of the lower intermediate bridge slides while in contact with the outer tube.

2. The hydraulic suspension according to claim 1, wherein, The first flow path is disposed between the upper front liquid chamber and the lower rear liquid chamber, and the second flow path is disposed between the upper rear liquid chamber and the lower front liquid chamber. Furthermore, the first flow path and the second flow path extend obliquely relative to the axial direction of the main rubber body.

3. The hydraulic suspension according to claim 1, wherein, The upper front liquid chamber and the lower rear liquid chamber are located on different circumferences of the main rubber body.

4. The hydraulic suspension according to claim 1, wherein, The upper front liquid chamber and the lower front liquid chamber are located on the same circumference of the main rubber body, and the upper rear liquid chamber and the lower rear liquid chamber are located on the same circumference of the main rubber body.

5. The hydraulic suspension according to claim 1, wherein, The upper front liquid chamber is located in front of the upper rear liquid chamber, and the lower front liquid chamber is located in front of the lower rear liquid chamber.

6. The hydraulic suspension according to claim 1, wherein, In response to a vertical external force applied to the inner tube, the outer end of the upper intermediate bridge straightens or bends further to maintain contact with the outer tube, and In response to a vertical external force applied to the inner tube, the outer end of the lower intermediate bridge straightens or bends further to maintain contact with the outer tube.

7. The hydraulic suspension according to claim 6, wherein, When the outer end of the upper intermediate bridge straightens, the outer end of the lower intermediate bridge bends further, and When the outer end of the upper intermediate bridge bends further, the outer end of the lower intermediate bridge straightens.

8. The hydraulic suspension according to claim 1, wherein, The upper intermediate bridge is offset in one direction relative to the axial direction while gradually tapering outward in the radial direction of the main rubber body, and the lower intermediate bridge is offset in one direction relative to the axial direction while gradually tapering outward in the radial direction of the main rubber body.

9. The hydraulic suspension according to claim 1, wherein, The main rubber body also includes an intermediate tube coaxially arranged with the inner tube. The main rubber body is molded from the outer circumferential surface of the inner tube to the outer circumferential surface of the outer tube to cover the outer circumferential surface of the intermediate tube, and Each of the first flow path and the second flow path includes a groove disposed on the outer peripheral surface of the main rubber body and is sealed by the outer tube.

10. The hydraulic suspension according to claim 9, wherein, The intermediate tube includes an upper opening region and a lower opening region. The upper intermediate bridge contacts the outer tube through the upper opening region, and the lower intermediate bridge contacts the outer tube through the lower opening region.

11. The hydraulic suspension according to claim 10, wherein, The intermediate tube includes: A front stepped portion is provided in front of the upper opening region and the lower opening region, and forms a step relative to the center portion of the intermediate tube; and The rear step portion is located behind the upper opening area and the lower opening area, and forms a step relative to the central portion of the intermediate tube.

12. The hydraulic suspension according to claim 11, wherein, The main rubber body includes: The upper front axle is adjacent to the upper front liquid chamber and fixed to the front stepped portion of the intermediate tube; The upper rear axle is adjacent to the upper rear liquid chamber and fixed to the rear stepped portion of the intermediate tube; The lower front axle, adjacent to the lower front liquid chamber and fixed to the front stepped portion of the intermediate tube; and The lower rear axle is adjacent to the lower rear liquid chamber and fixed to the rear stepped portion of the intermediate tube.

13. The hydraulic suspension according to claim 1, wherein, The first flow path includes: The first upper flow path is adjacent to and extends radially from the upper front liquid chamber; A first lower flow path, adjacent to and extending radially from the lower rear liquid chamber; and A first intermediate flow path is disposed between the first upper flow path and the first lower flow path to connect the first upper flow path and the first lower flow path, and extends obliquely relative to the axial direction of the main rubber body.

14. The hydraulic suspension according to claim 13, wherein, The second flow path includes: The second upper flow path is adjacent to and extends radially from the upper rear liquid chamber; The second lower flow path is adjacent to and extends radially from the lower front liquid chamber; and The second intermediate flow path is disposed between the second upper flow path and the second lower flow path to connect the second upper flow path and the second lower flow path, and extends obliquely relative to the axial direction of the main rubber body.

15. The hydraulic suspension according to claim 14, wherein, The main rubber body includes: A first bypass flow path connects the upper rear liquid chamber and the first flow path, allowing fluid to move between the two. The second bypass flow path connects the upper front liquid chamber and the second flow path, allowing fluid to move between the two; A first rubber membrane, disposed in the first bypass flow path to prevent fluid flow between the first bypass flow path and the first flow path, and configured to allow fluid flow when the first rubber membrane selectively folds toward the first bypass flow path due to fluid pressure in the first flow path; and A second rubber membrane is disposed in the second bypass flow path to prevent fluid flow between the second bypass flow path and the second flow path, and is configured to allow fluid flow when the second rubber membrane is selectively folded toward the second bypass flow path due to fluid pressure present in the second bypass flow path.

16. The hydraulic suspension according to claim 15, wherein, The first bypass flow path connects the first lower flow path and the upper rear liquid chamber, allowing fluid to move between them. Furthermore, the first bypass flow path extends in the circumferential direction of the main rubber body. The second bypass flow path connects the second lower flow path and the upper front liquid chamber, allowing fluid to move between the two, and the second bypass flow path extends in the circumferential direction of the main rubber body.

17. The hydraulic suspension according to claim 1, further comprising: The intermediate plate located on the outer circumferential surface of the inner tube, The intermediate plate includes an upper intermediate plate disposed within the upper intermediate bridge and a lower intermediate plate disposed within the lower intermediate bridge.

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