A magnetorheological hydraulic bushing and its control method, and an automobile

Abstract

This application discloses a magnetorheological hydraulic bushing and its control method, as well as an automobile. The magnetorheological hydraulic bushing includes a first hydraulic chamber and a second hydraulic chamber separated by a first channel connecting the first and second hydraulic chambers. Magnetorheological fluid is disposed in both the first and second hydraulic chambers. It also includes a magnetic field control component, which provides a second channel with a controllable magnetic field, connected to both the first and second hydraulic chambers. This application utilizes the solid-liquid transition characteristics of the magnetorheological fluid to control the opening of the second channel, thereby achieving optimal dynamic stiffness and damping characteristics under different vehicle driving conditions. It can simultaneously accommodate high damping under low-frequency, large-amplitude conditions and low dynamic stiffness under mid-to-high-frequency, small-amplitude conditions, thus achieving vibration reduction.

Description

Technical Field

[0001] This invention relates to the field of automotive parts technology, specifically to a magnetorheological hydraulic bushing and its control method, as well as an automobile. Background Technology

[0002] The damping effect of hydraulic bushings can effectively attenuate vibrations, thereby improving ride comfort. However, traditional hydraulic bushings have high dynamic stiffness in high-frequency regions, and excessive dynamic stiffness can lead to poor vibration isolation and structural noise, among other NVH (noise, vibration, and harshness) problems. Summary of the Invention

[0003] This application provides a magnetorheological hydraulic bushing, including a first hydraulic chamber and a second hydraulic chamber separated by space, and a first channel connecting the first hydraulic chamber and the second hydraulic chamber, wherein the first hydraulic chamber and the second hydraulic chamber are provided with magnetorheological fluid; it also includes a magnetic field control component, wherein the magnetic field control component is provided with a second channel that is controllable by a magnetic field, and the second channel is connected to the first hydraulic chamber and the second hydraulic chamber.

[0004] In one specific embodiment, the magnetorheological hydraulic bushing includes an inner sleeve component and an outer sleeve component. The inner sleeve component is press-fitted and fixed inside the outer sleeve component. The inner cavity of the inner sleeve component is divided into a first hydraulic cavity and a second hydraulic cavity by an axially extending partition. The inner sleeve component has a first connecting hole and a second connecting hole on its cylinder wall.

[0005] The magnetic field control component is disposed between the inner sleeve component and the outer sleeve component. The first connecting hole is used to connect one side of the first hydraulic chamber and the second channel, and the second connecting hole is used to connect the other side of the second hydraulic chamber and the second channel.

[0006] In one specific embodiment, the magnetic field control component includes a cylindrical outer shell, the cylindrical wall of which is provided with a first opening and a second opening to communicate with the first connecting hole and the second connecting hole, respectively; the magnetic field control component also includes a first electrode plate and a second electrode plate for receiving electricity, the first electrode plate and the second electrode plate are inserted into the outer shell and arranged opposite to each other, a gap is formed between the first electrode plate and the second electrode plate to form a second channel, and the two sides of the second channel are respectively connected to the first opening and the second opening.

[0007] In one embodiment, the outer shell includes a skeleton and a rubber structure that encloses the skeleton.

[0008] In one specific embodiment, it further includes a flow channel seat, which is disposed between the inner sleeve component and the outer sleeve component. The flow channel seat has a slot extending axially, and the magnetic field control component is inserted into the slot. The flow channel seat has a first flow channel and a second flow channel. The two ends of the first flow channel are respectively connected to the first connecting hole and the first opening, and the two ends of the second flow channel are respectively connected to the second connecting hole and the second opening.

[0009] In one specific embodiment, the inner peripheral wall of the outer sleeve component is divided into a first inner peripheral wall portion and a second inner peripheral wall portion along the circumferential direction. The first inner peripheral wall portion fits into the outer peripheral wall of the inner sleeve component, and the second inner peripheral wall portion has a gap with the outer peripheral wall of the inner sleeve component to form a mounting cavity. The flow channel seat is disposed in the mounting cavity, and the outer peripheral wall of the flow channel seat is adapted to the cavity wall of the mounting cavity.

[0010] In one specific embodiment, the flow channel seat is provided with two or more first flow channels distributed along the axial direction, and two or more second flow channels distributed along the axial direction, wherein both the first flow channels and the second flow channels penetrate the sidewall of the slot.

[0011] In one specific embodiment, the slot is a groove with the opening facing the outer sleeve component; both the first flow channel and the second flow channel are open on the side facing the outer sleeve component, and the inner peripheral wall of the outer sleeve component seals the groove and the openings of the first flow channel and the second flow channel.

[0012] In one specific embodiment, the inner sleeve component includes a skeleton and a rubber structure covering the skeleton; it also includes an axially extending inner core that passes through the partition in the axial direction, and the inner core and the outer sleeve component are used to connect two components of the automobile, respectively.

[0013] This application also provides a control method for a magnetorheological hydraulic bushing, which, based on the magnetorheological hydraulic bushing described in any of the above claims, controls the magnetic field control component of the magnetorheological hydraulic bushing to be energized under low-frequency, large-amplitude operating conditions.

[0014] Under medium- and high-frequency small-amplitude operating conditions, the control magnetic field control component is de-energized;

[0015] Under high-frequency, low-amplitude operating conditions, the control magnetic control component is energized.

[0016] This application also provides an automobile comprising the magnetorheological hydraulic bushing described in any of the preceding claims.

[0017] In this application, the magnetorheological hydraulic bushing has two hydraulic chambers that can be connected by a second channel. This second channel can be closed, opened, and its opening degree can be adjusted by controlling the magnetic field strength. Thus, by utilizing the solid-liquid transition characteristics of the magnetorheological fluid to control the opening degree of the second channel, optimal dynamic stiffness and damping characteristics can be achieved under different vehicle driving conditions. This simultaneously accommodates high damping under low-frequency, large-amplitude conditions and low dynamic stiffness under mid-to-high-frequency, small-amplitude conditions, thereby achieving vibration reduction. Attached Figure Description

[0018] Figure 1 A schematic diagram of a specific embodiment of the magnetorheological hydraulic bushing provided in this application;

[0019] Figure 2 for Figure 1 Exploded view;

[0020] Figure 3 for Figure 1 Schematic diagram of the inner sleeve component;

[0021] Figure 4 for Figure 1 A cross-sectional view;

[0022] Figure 5 for Figure 1 Schematic diagram of the central magnetic field control component;

[0023] Figure 6 for Figure 5 The main view;

[0024] Figure 7 for Figure 6 Sectional view along line AA;

[0025] Figure 8 This is a schematic diagram of the flow channel seat in section 2;

[0026] Figure 9 for Figure 1 Schematic diagram of the damping characteristics of a magnetorheological hydraulic bushing;

[0027] Figure 10 for Figure 1 The damping angle and frequency curves of the medium magnetorheological hydraulic bushing in the 1-50Hz frequency range;

[0028] Figure 11 for Figure 1 The damping angle and frequency curves of the medium magnetorheological hydraulic bushing in the frequency range of 1-150Hz;

[0029] Figure 12 for Figure 1 Curves of dynamic stiffness and frequency of the magnetorheological hydraulic bushing in the 1-150Hz frequency range;

[0030] Figure 13 for Figure 1 Curves of dynamic stiffness and frequency of the medium magnetorheological hydraulic bushing in the 1-500Hz frequency range.

[0031] Figure 1-13 The annotations in the attached figures are explained as follows:

[0032] 1-Outer sleeve component;

[0033] 2-Inner sleeve component; 21-Rubber structure; 21a-First through hole; 21b-Second through hole; 211-Separator; 22-Skeleton; 22a-Third through hole; 22b-Fourth through hole; 22c-First channel; 23-Inner core; 2a-First hydraulic chamber; 2b-Second hydraulic chamber; 2c-First connecting hole; 2d-Second connecting hole;

[0034] 3-Flow channel seat; 3a-Slot; 3b-First flow channel; 3b1-First flow channel hole; 3c-Second flow channel; 3c1-Second flow channel hole; 31-Slot sidewall; 32-Slot sidewall;

[0035] 4-Magnetic field control component; 41-First electrode plate; 42-Second electrode plate; 43-Outer shell; 43a-First opening; 43b-Second opening; 431-Frame; 432-Rubber structure; 4a-Second channel. Detailed Implementation

[0036] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Please refer to Figure 1 , Figure 1 A schematic diagram of a specific embodiment of the magnetorheological hydraulic bushing provided in this application; Figure 2 for Figure 1 Exploded view; Figure 3 for Figure 1 Schematic diagram of inner sleeve component 2; Figure 4 for Figure 1 A cross-sectional view.

[0038] The magnetorheological hydraulic bushing in this embodiment includes an inner sleeve component 2 and an outer sleeve component 1, both of which are sleeve-shaped structures, or cylindrical structures. The inner sleeve component 2 is nested within the outer sleeve component 1. The inner sleeve component 2 includes a first hydraulic chamber 2a and a second hydraulic chamber 2b separated by a partition 211. Figure 3 , 4As shown, the partition 211 extends axially, dividing the inner cavity of the inner sleeve component 2 into two parts: a first hydraulic cavity 2a and a second hydraulic cavity 2b. Furthermore, the magnetorheological hydraulic bushing in this embodiment also includes a first channel 22c, which connects the first hydraulic cavity 2a and the second hydraulic cavity 2b, ensuring that the first hydraulic cavity 2a and the second hydraulic cavity 2b are always in a connected state. Specifically, the first channel 22c can be disposed on the cylinder wall of the inner sleeve component 2, and can extend circumferentially, being either an arc-shaped channel or an annular channel. This embodiment does not limit the specific structural form or placement of the first channel 22c.

[0039] It is worth noting that in this embodiment, the liquids in the first hydraulic chamber 2a and the second hydraulic chamber 2b are magnetorheological fluids. Magnetorheological fluids (MR fluids) are fluids with controllable flowability. They exhibit low-viscosity Newtonian fluid characteristics when there is no external magnetic field, and high-viscosity, low-flow Bingham fluid characteristics when an external magnetic field is applied. That is, the viscosity of the magnetorheological fluid corresponds to the magnetic flux, and it has the characteristics of low conversion energy consumption, easy control, and rapid response (millisecond level).

[0040] like Figure 4 As shown, the magnetorheological hydraulic bushing in this embodiment also includes a magnetic field control component 4. The magnetic field control component 4 is provided with a second magnetic field controllable channel 4a, that is, the magnetic field control component 4 can be electrically connected to an external source to control the magnetic field strength in the second channel 4a through changes in current. The second channel 4a is connected to the first hydraulic chamber 2a and the second hydraulic chamber 2b. In this way, by controlling the magnetic field of the second channel 4a, the viscosity and flowability of the magnetorheological liquid in the second channel 4a can be controlled, so that the magnetorheological liquid in the second channel 4a can switch between liquid and solid states. The second channel 4a acts as a switch valve. When it is in a liquid state, the second channel 4a can conduct the first hydraulic chamber 2a and the second hydraulic chamber 2b, which is equivalent to the switch valve being open, that is, the first hydraulic chamber 2a and the second hydraulic chamber 2b are simultaneously connected through the first channel 22c and the second channel 4a. Or when it is in a solid state, the second channel 4a does not have the function of passing through, thereby disconnecting the conduction of the first hydraulic chamber 2a and the second hydraulic chamber 2b at the second channel 4a, which is equivalent to the switch valve being closed, and the two hydraulic chambers can only be connected through the first channel 22c.

[0041] For specific configuration instructions for the second channel 4a, please refer to [link / reference]. Figure 2 , 3 Understandably, in this embodiment, the inner sleeve component 2 has a first connecting hole 2c and a second connecting hole 2d that penetrate the inside and outside of the sleeve wall. For example... Figure 4As shown, the magnetic field control component 4 is positioned between the inner sleeve component 2 and the outer sleeve component 1. The first connecting hole 2c connects one side of the first hydraulic chamber 2a and the second channel 4a, and the second connecting hole 2d connects the other side of the second hydraulic chamber 2b and the second channel 4a. This arrangement creates an installation position for the magnetic field control component 4 between the inner sleeve component 2 and the outer sleeve component 1, facilitating communication between the second channel 4a and the two hydraulic chambers. The first connecting hole 2c and the second connecting hole 2d can be perpendicular to the axial direction; the direction of the connecting holes is not limited, as long as they can connect the inside and outside of the inner sleeve component 2 to connect the corresponding hydraulic chamber and the second channel 4a.

[0042] like Figure 5-7 As shown, Figure 5 for Figure 1 Schematic diagram of the medium magnetic field control component 4; Figure 6 for Figure 5 The main view; Figure 7 for Figure 6 Sectional view along the AA direction.

[0043] The magnetic field control component 4 in this embodiment includes a cylindrical outer shell 43. The cylindrical wall of the outer shell 43 is provided with a first opening 43a and a second opening 43b to connect to a first connecting hole 2c and a second connecting hole 2d, respectively. Figure 5 In the middle, the outer shell 43 is generally a cuboid structure, the first opening 43a and the second opening 43b extend along the height direction of the outer shell, and the height direction is parallel to the axis of the magnetohydrodynamic bushing. The first opening 43a and the second opening 43b are respectively arranged on the two side walls extending in the width direction.

[0044] The magnetic field control component 4 also includes a first electrode plate 41 and a second electrode plate 42 for power connection. The first electrode plate 41 and the second electrode plate 42 are inserted into the housing 43 and arranged opposite to each other. There is a gap between the first electrode plate 41 and the second electrode plate 42 to form a second channel 4a. The two sides of the second channel 4a are respectively connected to a first opening 43a and a second opening 43b. The first opening 43a and the second opening 43b are respectively connected to a first connecting hole 2c and a second connecting hole 2d. With this configuration, when the first electrode plate 41 and the second electrode plate 42 are energized, the required magnetic field can be directly generated in the second channel 4a.

[0045] Specifically, in this embodiment, the outer shell 43 of the magnetic field control component 4 may include a skeleton 431 and a rubber structure 432 that wraps the skeleton 431. That is, the rubber structure 432 can be integrally vulcanized with the skeleton 431. In this way, the skeleton 431 can provide the required strength, while the rubber structure 432 is elastic and conducive to vibration reduction.

[0046] For the same reason, in the above embodiments, the inner sleeve component 2 also includes a skeleton 22 and a rubber structure 21, with the rubber structure 21 covering the skeleton 22. That is, the rubber structure 21 and the skeleton 22 are integrally vulcanized. The partition 211 is also made of integrally vulcanized rubber, so the partition 211 has a certain elasticity and is easy to generate the required damping. Figure 2 The rubber structure 21 covers the ends of the skeleton and is also sealed at both ends. That is, the two hydraulic chambers formed by the partition 211 can only communicate with each other through the first channel 22c and the second channel 4a. Furthermore, the inner sleeve component 2 also includes an axially extending inner core 23 that passes axially through the partition 211. The inner core 23 can be a hollow shaft component. The inner core 23 and the aforementioned outer sleeve component 1 can be used to connect two external components, such as the control arm of a car's suspension and the subframe. That is, the inner core 23 connects to the suspension control arm, and the outer sleeve component 1 is fixed to the subframe. The outer sleeve component 1 can be made of metal. The two components can also be other two components on the car that require a connection. (Continue to refer to...) Figure 2 The first through hole 21a on the cylinder wall of the rubber structure 21 and the third through hole 22a on the skeleton 22 combine to form the first connecting hole 2c, and the second through hole 21b on the cylinder wall of the rubber structure 21 and the fourth through hole 22b on the skeleton 22 combine to form the second connecting hole 2d.

[0047] Please continue to refer to this. Figure 8 , Figure 8 This is a schematic diagram of the flow channel seat 3 in section 2.

[0048] like Figure 4 As shown, the flow channel seat 3 is disposed between the inner sleeve component 2 and the outer sleeve component 1. The flow channel seat 3 has an axially extending slot 3a, into which the magnetic field control component 4 is inserted. The flow channel seat 3 can be made of metal, such as aluminum, or plastic, providing sufficient strength for reliable installation of the magnetic field control component 4. Furthermore, the flow channel seat 3 has a first flow channel 3b and a second flow channel 3c, which, in combination... Figure 4 Understanding this, the two ends of the first flow channel 3b are respectively connected to the first connecting hole 2c opened in the cylinder wall of the inner sleeve component 2 and the first opening 43a on one side of the magnetic field control component 4. The two ends of the second flow channel 3c are respectively connected to the second connecting hole 2d opened in the cylinder wall of the inner sleeve component 2 and the second opening 43b on the other side of the magnetic field control component 4. That is, the flow channel seat 3 establishes a connection between the second channel 4a of the magnetic field control component 4 and the two hydraulic chambers of the inner sleeve component 2. In this way, the flow channel seat 3 not only serves to reliably install the magnetic field control component 4, but its first flow channel 3b and second flow channel 3c can also play a certain buffering role, preventing the magnetorheological fluid from passing through the second flow channel 3c too quickly, so as to generate the required damping.

[0049] For details, please continue to refer to Figure 4 The inner circumferential wall of the outer sleeve component 1 is divided into a first inner circumferential wall portion and a second inner circumferential wall portion along the circumferential direction. Since both the outer sleeve component 1 and the inner sleeve component 2 in this embodiment are cylindrical, the first inner circumferential wall portion and the second inner circumferential wall portion are both arc-shaped walls, namely the first arc-shaped circumferential wall and the second arc-shaped circumferential wall, which are joined together along the circumferential direction to form a complete cylindrical inner circumferential wall. The first arc-shaped circumferential wall is fitted to the outer circumferential wall of the inner sleeve component 2, while the second arc-shaped circumferential wall (the inner circumferential wall on the left side of Figure 5) has a gap with the outer circumferential wall of the inner sleeve component 2 to form a mounting cavity. The flow channel seat 3 is disposed in the mounting cavity, and the outer circumferential wall of the flow channel seat 3 is adapted to the cavity wall of the mounting cavity.

[0050] The mounting cavity is formed by a portion of the outer peripheral wall of the inner sleeve component 2 and the second arc-shaped peripheral wall of the outer sleeve component 1. Therefore, the cavity wall of the mounting cavity is the second arc-shaped peripheral wall and a corresponding section of the arc-shaped peripheral wall of the inner sleeve component 2. The flow channel seat 3 is adapted to the cavity wall of the mounting cavity, that is, the outer peripheral wall of the flow channel seat 3 fits against the cavity wall. Figure 8 The flow channel seat 3 is crescent-shaped, and its outer peripheral wall includes an arc-shaped wall facing the outer sleeve component 1 and an arc-shaped wall facing the inner sleeve component 2. This arrangement facilitates sealing and prevents leakage of the magnetorheological fluid in the second flow channel 3c within the magnetic field control component 4. Figure 1 Both ends of the outer sleeve component 2 and the inner sleeve component 1 are closed, with only the inner core 23 in the middle of the inner sleeve component 1 connecting to the outside.

[0051] like Figure 2 As shown, the outer sleeve component 2 has a radially protruding portion, which corresponds to the aforementioned mounting cavity. The end of this portion has an exposed interface 1a, allowing the connection ends of the first electrode plate 41 and the second electrode plate 42 of the magnetic field control component 4 to be exposed through this interface 1a, thereby enabling electrical connection with an external power source. Specifically, Figure 5 In this configuration, the axial height of the first electrode plate 41 and the second electrode plate 42 is greater than the height of the outer shell 43. Parts of the two electrode plates extend out of the outer shell 43, so that the outer shell 43 can be encapsulated between the outer sleeve component 2 and the inner sleeve component 1, while the connecting ends of the two electrode plates can be exposed from the interface 1a.

[0052] Please continue to refer to this. Figure 8In this embodiment, the flow channel seat 3 is provided with two or more first flow channels 3b distributed along the axial direction, and two or more second flow channels 3c distributed along the axial direction. Both the first flow channels 3b and the second flow channels 3c penetrate the slot sidewalls 31 and 32 of the slot 3a, forming first flow channel holes 3b1 and second flow channel holes 3c1. The first flow channel holes 3b1 and second flow channel holes 3c1 are part of the first flow channels 3b and second flow channels 3c, respectively. The magnetorheological fluid can flow through multiple first flow channels 3b between the second channel 4a and the first hydraulic chamber 2a, and through multiple second flow channels 3c between the second channel 4a and the second hydraulic chamber 2b, resulting in better buffering and more uniform flow. Figure 8 shows two first flow channels 3b and two second flow channels 3c.

[0053] like Figure 8 As shown, the slot 3a of the flow channel seat 3 is specifically a groove, with the groove opening facing the inner peripheral wall of the outer sleeve component 1. The slot 3a also extends axially through the flow channel seat 3. The magnetic field control component 4 can be inserted into the slot 3a through the groove opening or axially into the slot 3a. Setting the slot 3a as a groove facilitates the deformation of the slot 3a, allowing the flow channel seat 3 to be relatively fixed after being inserted into the slot 3a, i.e., pressing the magnetic field control component 4 into the slot 3a. Of course, the slot 3a of the flow channel seat 3 is not limited to a groove; for example, it can also be an insertion hole structure extending axially through the flow channel seat 3.

[0054] In addition, such as Figure 8 As shown, in this embodiment, the first flow channel 3b and the second flow channel 3c open towards the side of the outer sleeve component 1. The slot and the openings of the first flow channel 3b and the second flow channel 3c are sealed by the inner peripheral wall of the outer sleeve component 1. In this way, the processing of the first flow channel 3b and the second flow channel 3c is more convenient. Of course, the first flow channel 3b and the second flow channel 3c can also be flow channels with ports at both ends.

[0055] The assembly process of this magnetorheological hydraulic bushing is as follows:

[0056] Insert the flow channel seat 3 into the outer sleeve component 1, and then press-fit the inner sleeve component 2 into the outer sleeve component 1, that is, insert the inner sleeve component 2 into the outer sleeve component 1 and press-fit it with an interference fit, and clamp the flow channel seat 3 between the inner sleeve component 2 and the outer sleeve component 1.

[0057] The magnetic field control component 4 is press-fitted from the interface 1a into the flow channel seat 3.

[0058] You can continue to refer to this. Figure 9 understand, Figure 9 for Figure 1 A schematic diagram of the damping characteristics of a magnetorheological hydraulic bushing.

[0059] Figure 9In this diagram, Ks represents the component stiffness provided by the rubber in the magnetorheological hydraulic bushing, c1 is the damping characteristic provided by the inner sleeve component 2, c2 is the damping characteristic provided by the magnetic field control component 4 and the flow channel seat 3, and the switching valve represents the energized and de-energized states. The opening and closing of the switching valve ensures that the magnetic field control component 4 only provides damping characteristics under specific operating conditions. When the magnetic field control component 4 is energized, the second channel 4a is disconnected; when the magnetic field control component 4 is de-energized, the second channel 4a is opened.

[0060] This embodiment also provides a control method for controlling the above-mentioned magnetorheological hydraulic bushing, as follows:

[0061] Under low-frequency, large-amplitude operating conditions, the magnetic field control component 4 of the magnetorheological hydraulic bushing is energized, thus closing the second channel 4a, which is beneficial to obtaining a larger damping angle to provide vibration attenuation at a specific frequency.

[0062] Under medium- and high-frequency small-amplitude operating conditions, the control magnetic field control component 4 is de-energized, which opens the second channel 4a, thereby reducing the dynamic stiffness and achieving the purpose of vibration reduction.

[0063] Under high-frequency, low-amplitude operating conditions, the magnetic control component can be energized to shut down the second channel 4a again, thus maintaining the same dynamic stiffness as the conventional hydraulic bushing.

[0064] The aforementioned low-frequency, large-amplitude operating conditions are, for example, 1–50 Hz; mid-to-high frequency, small-amplitude operating conditions are, for example, 50–140 Hz; and high-frequency, small-amplitude operating conditions are, for example, above 140 Hz. This is just an example; the specific classification can be based on the actual frequency and amplitude variations.

[0065] You can continue to refer to this. Figure 10-13 understand, Figure 10 for Figure 1 The damping angle and frequency curves of the magnetorheological hydraulic bushing in the frequency range of 1-50Hz, where the amplitude is ±0.3mm; Figure 11 Figure 1 shows the damping angle and frequency curves of the magnetorheological hydraulic bushing in the frequency range of 1-150Hz, where the amplitude is within ±0.1mm. Figure 12 for Figure 1 The curves of dynamic stiffness and frequency of the magnetorheological hydraulic bushing in the frequency range of 1-150Hz, where the amplitude is ±0.1mm; Figure 13 for Figure 1 The curves of dynamic stiffness and frequency of the magnetorheological hydraulic bushing in the frequency range of 1-500Hz, where the amplitude is ±0.05mm. Figure 10-13In the diagram, solid line a corresponds to the case where the second channel 4a is completely closed, and dashed line b corresponds to the case where the second channel 4a is partially closed (3 / 5 closed). In this case, the second channel 4a is equivalent to having a partial opening, not a full opening, and is used to monitor the trend of the process from fully closed to fully open. Dotted line c corresponds to the case where the second channel 4a is fully open.

[0066] As can be seen from the comparison, at mid-to-high frequencies, when the second channel 4a is activated, the dynamic stiffness of the magnetorheological hydraulic bushing can be reduced, thereby achieving vibration reduction. However, at high frequencies, such as... Figure 13 As shown, when the second channel 4a is turned on, the magnetorheological fluid is more likely to resonate with the magnetorheological fluid when it is simultaneously connected in the first channel 22c and the second channel 4a (the dynamic stiffness increases significantly after 90Hz). Therefore, the second channel 4a is turned off at high frequencies to maintain the same dynamic stiffness as the traditional hydraulic bushing.

[0067] In addition to the above embodiments, this application also provides an automobile that includes the magnetorheological hydraulic bushing described in any of the above embodiments, which has the same technical effects as the above embodiments, and will not be described again.

[0068] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A magnetorheological hydraulic bushing, characterized in that, It includes a first hydraulic chamber and a second hydraulic chamber separated from each other, and a first channel connecting the first hydraulic chamber and the second hydraulic chamber, wherein the first hydraulic chamber and the second hydraulic chamber are provided with magnetorheological fluid; it also includes a magnetic field control component, wherein the magnetic field control component is provided with a second channel that is controllable by a magnetic field, and the second channel is connected to the first hydraulic chamber and the second hydraulic chamber; The magnetorheological hydraulic bushing includes an inner sleeve component and an outer sleeve component. The inner sleeve component is press-fitted and fixed inside the outer sleeve component. The inner cavity of the inner sleeve component is divided into a first hydraulic cavity and a second hydraulic cavity by an axially extending partition. The inner sleeve component has a first connecting hole and a second connecting hole on its cylinder wall. The magnetic field control component is disposed between the inner sleeve component and the outer sleeve component. The first connecting hole is used to connect one side of the first hydraulic chamber and the second channel, and the second connecting hole is used to connect the other side of the second hydraulic chamber and the second channel.

2. The magnetorheological hydraulic bushing according to claim 1, characterized in that, The magnetic field control component includes a cylindrical outer shell, the cylindrical wall of which is provided with a first opening and a second opening to connect to the first connecting hole and the second connecting hole respectively; the magnetic field control component also includes a first electrode plate and a second electrode plate for receiving electricity, the first electrode plate and the second electrode plate are inserted into the outer shell and arranged opposite to each other, and there is a gap between the first electrode plate and the second electrode plate to form a second channel, the two sides of the second channel are respectively connected to the first opening and the second opening.

3. The magnetorheological hydraulic bushing according to claim 2, characterized in that, The outer shell includes a skeleton and a rubber structure that encloses the skeleton.

4. The magnetorheological hydraulic bushing according to claim 2, characterized in that, It also includes a flow channel seat, which is disposed between the inner sleeve component and the outer sleeve component. The flow channel seat has a slot extending axially, and the magnetic field control component is inserted into the slot. The flow channel seat has a first flow channel and a second flow channel. The two ends of the first flow channel are respectively connected to the first connecting hole and the first opening, and the two ends of the second flow channel are respectively connected to the second connecting hole and the second opening.

5. The magnetorheological hydraulic bushing according to claim 4, characterized in that, The inner peripheral wall of the outer sleeve component is divided into a first inner peripheral wall portion and a second inner peripheral wall portion along the circumferential direction. The first inner peripheral wall portion fits into the outer peripheral wall of the inner sleeve component. The second inner peripheral wall portion has a gap with the outer peripheral wall of the inner sleeve component to form a mounting cavity. The flow channel seat is disposed in the mounting cavity, and the outer peripheral wall of the flow channel seat is adapted to the cavity wall of the mounting cavity.

6. The magnetorheological hydraulic bushing according to claim 5, characterized in that, The flow channel seat has two or more first flow channels distributed along the axial direction, and two or more second flow channels distributed along the axial direction, wherein both the first flow channels and the second flow channels penetrate the sidewall of the slot.

7. The magnetorheological hydraulic bushing according to claim 6, characterized in that, The slot is a groove, with the opening of the groove facing the outer sleeve component; both the first flow channel and the second flow channel are open on the side facing the outer sleeve component, and the inner peripheral wall of the outer sleeve component seals the groove and the openings of the first flow channel and the second flow channel.

8. The magnetorheological hydraulic bushing according to any one of claims 1-7, characterized in that, The inner sleeve component includes a skeleton and a rubber structure, the rubber structure covering the skeleton; it also includes an axially extending inner core that passes through the partition in the axial direction, the inner core and the outer sleeve component being used for two different components of an automobile.

9. A control method for a magnetorheological hydraulic bushing, based on the magnetorheological hydraulic bushing according to any one of claims 1-8, characterized in that, Under low-frequency, large-amplitude operating conditions, the magnetic field control component controlling the magnetorheological hydraulic bushing is energized; Under medium- and high-frequency small-amplitude operating conditions, the control magnetic field control component is de-energized; Under high-frequency, low-amplitude operating conditions, the control magnetic field control component is energized.

10. A car, characterized in that, Includes the magnetorheological hydraulic bushing as described in any one of claims 1-8.

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