CN110259873B - Mixed-mode magneto-rheological vibration isolator - Google Patents
Mixed-mode magneto-rheological vibration isolator Download PDFInfo
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- CN110259873B CN110259873B CN201910579017.XA CN201910579017A CN110259873B CN 110259873 B CN110259873 B CN 110259873B CN 201910579017 A CN201910579017 A CN 201910579017A CN 110259873 B CN110259873 B CN 110259873B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/53—Means for adjusting damping characteristics by varying fluid viscosity, e.g. electromagnetically
- F16F9/535—Magnetorheological [MR] fluid dampers
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Abstract
The invention relates to a mixed-mode magneto-rheological vibration isolator which comprises an upper shell, a lower shell and damping components, wherein the lower shell is buckled with the upper shell; the damping assembly comprises an inner damping assembly and an outer damping assembly; the inner damping assembly comprises an extrusion magnetic core, an inner magnetic core ring which is sleeved outside the extrusion magnetic core at radial intervals, an upper magnetic plate arranged on the extrusion magnetic core, and a magnetic conduction disc and a lower magnetic plate which are arranged below the extrusion magnetic core; a radial upper extrusion damping channel is formed between the extrusion magnetic core and the upper magnetic plate, a radial lower extrusion damping channel is formed between the extrusion magnetic core and the magnetic conduction disc, and the upper extrusion damping channel and the lower extrusion damping channel are communicated through a gap between the extrusion magnetic core and the inner magnetic core ring; a circumferential radial damping channel communicated with the lower extrusion damping channel is formed between the magnetic conductive disc and the lower magnetic plate, and an elastic bottom membrane is arranged in the lower shell; the vibration isolation device is beneficial to realizing active vibration isolation in a wider frequency range and meeting the vibration isolation requirements of vehicles under different working conditions.
Description
Technical Field
The invention relates to a magnetorheological vibration isolator, in particular to a mixed-mode magnetorheological vibration isolator.
Background
The magnetorheological fluid is an intelligent material with both magnetic conductivity of a magnetic material and fluid fluidity, can be instantly (in milliseconds) changed from free flowing liquid to semisolid under the action of a magnetic field, and has controllable yield strength, and the rheological property is continuously and steplessly changed along with the magnetic field and the change is reversible. The magnetorheological vibration isolator utilizes the rheological property of the magnetorheological fluid, and changes the output damping force and the rigidity of the magnetorheological vibration isolator by controlling the current in the excitation coil to change the magnetic field intensity, thereby isolating the vibration of a vehicle power assembly.
The existing magnetorheological vibration isolator of a vehicle vibration isolation system generally comprises a shell, a main rubber spring, a magnetic core, a bottom rubber membrane and a sealing element, and has the following defects:
1) most of the traditional magneto-rheological vibration isolators are in single modes such as flow or extrusion, the flow mode has better controllability but smaller output damping force, and the extrusion mode can provide larger damping force but has poorer controllability, so that the vibration isolation effect of a vibration isolation system is limited;
2) the existing multi-mode magneto-rheological vibration isolator is generally driven by a plurality of excitation coils corresponding to different working modes respectively, so that the structural complexity and the occupied space of the multi-mode magneto-rheological vibration isolator are increased;
3) the vibration isolation frequency range and the dynamic stiffness of the suspension of the existing magneto-rheological vibration isolator are limited, and the use requirements of an automobile power assembly under various working conditions cannot be met.
Based on the problems, the invention provides a hybrid mode magneto-rheological vibration isolator. On the premise of not changing the external size of the original vibration isolation device, the matched die type magneto-rheological vibration isolator can realize the simultaneous control of the magnetic induction intensity at the extrusion damping channel and the circumferential radial damping channel through a group of excitation coils, is favorable for providing larger damping force under low energy consumption and improves the vibration isolation range of the magneto-rheological vibration isolator; the output damping force of the magnetorheological vibration isolator is changed through the excitation current of the other group of magnet exciting coils, so that active vibration isolation can be realized in a wider frequency range, and the vibration isolation requirements of vehicles under different working conditions can be met; and the structure is compact.
Disclosure of Invention
In view of the above, in order to overcome the defects in the prior art, the invention provides a mixed-mode magnetorheological vibration isolator, which can realize simultaneous control of the magnetic induction intensity at the extrusion damping channel and the circumferential radial damping channel through a group of excitation coils on the premise of not changing the external dimension of the original vibration isolation device, is beneficial to providing larger damping force under low energy consumption and improving the vibration isolation range of the magnetorheological vibration isolator; the output damping force of the magnetorheological vibration isolator is changed through the excitation current of the other group of magnet exciting coils, so that active vibration isolation can be realized in a wider frequency range, and the vibration isolation requirements of vehicles under different working conditions can be met; and the structure is compact.
The invention relates to a hybrid mode magneto-rheological vibration isolator which comprises an upper shell, a lower shell buckled with the upper shell and damping components arranged in the upper shell and the lower shell; the buckling surfaces of the upper shell and the lower shell are provided with sealing rings for sealing the joint of the upper shell and the lower shell; the upper shell and the lower shell are buckled to form a cavity inside; the buckling connection of the upper shell and the lower shell belongs to the prior art, and is not described herein again if the upper shell and the lower shell are connected through bolts; the material selection of the upper shell and the lower shell belongs to the prior art, such as a magnetism isolating aluminum alloy material, and is not repeated;
the damping assembly comprises an inner damping assembly and an outer damping assembly; the inner damping assembly comprises an extrusion magnetic core, an inner magnetic core ring which is sleeved outside the extrusion magnetic core at radial intervals, an upper magnetic plate arranged on the extrusion magnetic core, and a magnetic conduction disc and a lower magnetic plate which are arranged below the extrusion magnetic core; the upper magnetic plate is arranged at the upper end of the inner magnetic core ring, so that the inner magnetic core ring is fixed conveniently; the extruded magnetic core is provided with an excitation coil, namely an excitation coil I; the radial direction here refers to the radial direction of the lower casing 1 of the barrel structure; a radial upper extrusion damping channel is formed between the extrusion magnetic core and the upper magnetic plate, a radial lower extrusion damping channel is formed between the extrusion magnetic core and the magnetic conduction disc, and the upper extrusion damping channel and the lower extrusion damping channel are communicated through a gap between the extrusion magnetic core and the inner magnetic core ring; a circumferential radial damping channel communicated with the lower extrusion damping channel is formed between the magnetic conductive disc and the lower magnetic plate and is communicated through a corresponding axial through hole on the magnetic isolation base; the magnetic conductive disc is sleeved outside the boss of the lower magnetic plate in the radial direction; the magnetic induction intensity at the upper extrusion damping channel, the lower extrusion damping channel and the circumferential radial damping channel is controlled by the excitation coil I, so that the higher damping force can be provided under low energy consumption, and the vibration isolation range of the magneto-rheological vibration isolator can be expanded; the radial direction refers to the radial direction of the magnetic conductive disc; an elastic bottom film is arranged in the lower shell; the elastic bottom membrane is positioned below the magnetism isolating base and fixed on the inner side wall of the lower shell, and the space above the elastic bottom membrane is filled with magnetorheological fluid; the material selection of the elastic bottom membrane belongs to the prior art, such as rubber with good elasticity and low cost, and is not described herein again; the damping buffering of the magnetorheological fluid in the upper space of the elastic base membrane is facilitated, and the vibration reduction is facilitated; the extrusion magnetic core is fixedly connected with a connecting rod penetrating through the upper shell and is used for being connected with a corresponding part of an engine; the vibration reduction of the vibrating piece is facilitated.
Further, the outer damping assembly comprises a conical inner magnetic core arranged at the radial outer side of the inner magnetic core ring and a conical outer magnetic core matched with the radial conical surface of the conical inner magnetic core; an inclined axial damping channel is formed between the conical inner magnetic core and the conical outer magnetic core; the axial damping channels are communicated through corresponding axial through holes in the magnetism isolating base; the radial conical surface of the conical outer magnetic core is positioned on the radial outer side of the conical inner magnetic core, the radial conical surface of the conical inner magnetic core is positioned on the radial inner side of the conical outer magnetic core, and the radial conical surfaces of the conical inner magnetic core and the conical outer magnetic core are in conformal fit, so that an axial damping channel with an inclined angle is formed; the conical inner magnetic core is provided with an excitation coil, namely an excitation coil II, and a constant current source different from the excitation coil I; an inclined axial damping channel is formed between the conical inner magnetic core and the conical outer magnetic core, and the included angle between the axial damping channel and the axial direction is 5-15 degrees, preferably 10 degrees; the axial direction refers to the axial direction of the lower shell 1 of the barrel-shaped structure; when the excitation coil I meets the vibration isolation requirement, no current is input into the excitation coil II, the axial damping channel with the inclination angle serves as an inertia channel to relieve the dynamic hardening phenomenon of the magnetorheological fluid, and when the excitation coil I cannot meet the vibration isolation requirement, the current input is applied to the excitation coil II, so that the output damping force of the vibration isolator is increased, the vibration isolation frequency range is widened, and the vibration isolation requirements of vehicles under different working conditions are met; the damping component divides the inner cavity of the magneto-rheological vibration isolator into two parts and forms an upper cavity and a lower cavity which are communicated;
further, the conical outer magnetic core is provided with a radial lead channel; the wire channel is positioned at the side edge of the lower shell 1, and the wire channel corresponding to the conical outer magnetic core is arranged, so that the control of induced current at the axial damping channel with an inclined angle is facilitated; the tapered inner magnetic core is fixed on the magnetic isolation base, and the tapered outer magnetic core is fixed on the side walls of the upper shell and the lower shell, and is not described again if being fixedly connected through screws; a threaded hole is formed in the lower shell corresponding to the wire channel, and a sealing ring and a sealing element with a through hole are arranged in the threaded hole; the sealing of the lead channel is facilitated, and the selection of the sealing element belongs to the prior art, such as a sealing screw, and is not described again;
further, the magnetic isolation device also comprises a magnetic isolation assembly for magnetic isolation; the magnetism isolating assembly comprises an upper magnetism isolating ring I arranged at the top end of the upper magnetic plate, a magnetism isolating ring III arranged between the upper magnetic plate and the conical inner magnetic core, a magnetism isolating sleeve arranged between the inner magnetic core ring and the conical inner magnetic core, and an upper magnetism isolating ring II arranged at the top end of the conical outer magnetic core; the upper magnetism isolating ring I, the upper magnetic plate and the magnetism isolating ring III are fixedly connected to the top end of the conical inner magnetic core; the fixed connection of the upper magnetism isolating ring I, the upper magnetic plate and the magnetism isolating ring III belongs to the prior art, for example, the connection through screws is not repeated herein;
further, step surfaces which are opposite to each other in the axial direction are arranged on the inner sides of the upper shell and the lower shell; the axial direction here refers to the axial direction of the lower shell of the barrel structure; the upper magnetism isolating ring II, the conical outer magnetic core and the magnetism isolating base are sequentially and correspondingly matched and fixed between the axially opposite step surfaces; the upper magnetism isolating ring II at the top end of the conical outer magnetic core and the magnetism isolating base at the bottom end are favorably propped against each other; a step platform used for fixing the elastic bottom membrane on the step surface of the lower shell is arranged on the radial outer side of the magnetism isolating base; a space for accommodating and fixing the elastic bottom membrane is formed between the bottom end of the magnetism isolating base and the step surface of the lower shell, so that the fixing of the elastic bottom membrane by the step surface arranged on the magnetism isolating base is facilitated; the lower half cavity filled with the magnetorheological fluid is stably sealed;
furthermore, the lower magnetic plate is fixedly connected to the magnetic isolation base, and an axially communicated inertia channel is arranged near the axis position, so that the dynamic hardening phenomenon of the magnetorheological fluid can be relieved; the top end of the inertia channel is provided with a decoupling film fixedly connected in a groove at the top end of the lower magnetic plate; the arrangement of the decoupling film is beneficial to effectively relieving the magnetorheological fluid in the lower extrusion channel when the magnetorheological fluid is dynamically hardened, and is beneficial to widening the vibration isolation frequency range of the suspension; the magnetic isolation base is correspondingly provided with a through hole communicated with the inertia channel; the lower magnetic plate is fixed on the magnetic isolation base through a fastener, so that the structural stability is improved, and the fastener is selected in the prior art, such as a slotted cylindrical set screw, and is not described again;
furthermore, a plurality of thimbles for adjusting the gap width of the circumferential damping channel are arranged in the circumferential damping channel; the arrangement of the ejector pin is beneficial to realizing the adjustment of the output damping force of the vibration isolator;
furthermore, an elastic sealing piece for plugging the upper shell is arranged at the top of the upper shell and is used for realizing vibration reduction through damping change of magnetorheological fluid filled between the elastic sealing piece and the elastic bottom film when vibration is generated; the arrangement of the elastic sealing element and the elastic base membrane is beneficial to relieving the dynamic hardening phenomenon of the magnetorheological fluid; the material selection of the elastic sealing element belongs to the prior art, such as rubber with good elasticity and low cost, and the connection of the elastic sealing element and the upper shell belongs to the prior art, such as vulcanization, and is not described again; the connecting rod penetrates through the elastic sealing element along the axial direction and then is connected with a corresponding part of an engine;
further, the connecting rod is fixedly connected to the extrusion magnetic core through a double-end stud; a flow disturbing disc is arranged between the double-end stud and the connecting rod; the dynamic stiffness of the vibration isolator during high-frequency vibration is effectively reduced; a wire channel is axially arranged in the extrusion magnetic core, the stud and the connecting rod; the extrusion magnetic core, the stud and the axial wire channel arranged in the connecting rod are communicated with each other; the control of induced current at the upper extrusion damping channel, the lower extrusion damping channel and the circumferential radial damping channel is facilitated; a sealing ring is arranged in the wire channel, so that the sealing and the protection of the wire channel are facilitated;
furthermore, a reinforcing block for axially positioning the connecting rod is arranged on the elastic sealing element; the reinforcing block is provided with a liquid injection hole and an exhaust hole; the liquid injection hole and the exhaust hole respectively comprise a threaded hole penetrating through the reinforcing block and an unthreaded hole positioned in the elastic sealing element, the threaded hole of the liquid injection hole is communicated with the unthreaded hole, and the threaded hole of the exhaust hole is communicated with the unthreaded hole; the liquid injection hole and the exhaust hole are sealed through a sealing ring and a sealing element; the sealing element is a slotted countersunk head screw, and the description is omitted; the top end of the connecting rod is provided with an external thread used for connecting corresponding parts of an engine, and the bottom end of the connecting rod is provided with a screw hole used for being matched and connected with the stud; the power transmission is facilitated, and the connection of the connecting rod and the stud is facilitated.
The working principle of the mixed-mode magnetorheological vibration isolator is as follows: when the vehicle power assembly drives the mixed-mode magnetorheological vibration isolator to vibrate through the connecting rod, the damping force is increased along with the increase of the excitation current in the excitation coil; the excitation current in the excitation coil I and the excitation coil II is controlled by different constant current sources, so that the output damping force of the vibration isolator and the adjustable range of the output damping force can be adjusted; the excitation coil I can provide larger damping force under low energy consumption and expand the vibration isolation range of the magneto-rheological vibration isolator by controlling the magnetic induction intensity at the upper extrusion damping channel, the lower extrusion damping channel and the circumferential radial damping channel; when the excitation coil I cannot meet the vibration isolation requirement, current input is applied to the excitation coil II, the output damping force of the vibration isolator can be adjusted through controlling the magnetic induction intensity at the axial damping channel with the inclination angle, the vibration isolation frequency range is adjusted, and therefore the vibration isolation requirement of vehicles under different working conditions is met.
The invention has the beneficial effects that: the mixed-mode magneto-rheological vibration isolator realizes the simultaneous control of the magnetic induction intensity at the extrusion damping channel and the circumferential radial damping channel through the excitation coil I, is favorable for providing larger damping force under low energy consumption, and improves the vibration isolation range of the magneto-rheological vibration isolator; the adjustment of the gap width of the circumferential radial damping channel can be realized by adjusting the size of the thimble, which is beneficial to meeting the vibration isolation requirements of different automobile power assemblies; the decoupling film in the groove at the top end of the lower magnetic plate is beneficial to effectively relieving dynamic hardening of the magnetorheological fluid in the lower extrusion channel and is beneficial to widening the vibration isolation frequency range of the suspension; when the excitation coil I can not meet the vibration isolation requirement, the current input is applied to the excitation coil II, so that the output damping force of the vibration isolator can be increased, the vibration isolation frequency range is widened, and the vibration isolation requirements of vehicles under different working conditions are met; and the structure is compact.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic view of the magnetic circuit of the present invention.
FIG. 3 is a schematic view of the structure of the lower magnetic plate of the present invention.
FIG. 4 is a schematic view of the magnetic shield base structure of the present invention.
Detailed Description
When the invention is described in the orientation, the invention is described in the orientation shown in fig. 1, and the upper and lower orientations in the figure are also upper and lower in the description; the description of the upper and lower orientations should not be taken as limiting the invention.
Fig. 1 is a schematic structural diagram of the magnetorheological vibration isolator, fig. 2 is a schematic magnetic circuit diagram of the magnetorheological vibration isolator, fig. 3 is a schematic structural diagram of a lower magnetic plate of the magnetorheological vibration isolator, fig. 4 is a schematic structural diagram of a magnetic isolating base of the magnetorheological vibration isolator, and as shown in the drawings, the magnetorheological vibration isolator of the embodiment comprises: the damping device comprises an upper shell 9, a lower shell 1 buckled with the upper shell 9 and damping components arranged in the upper shell 9 and the lower shell 1; the buckling surfaces of the upper shell 9 and the lower shell 1 are provided with sealing rings 5 for sealing the joint of the upper shell 9 and the lower shell 1; the upper shell 9 and the lower shell 1 are buckled to form a cavity inside; the buckling connection between the upper shell 9 and the lower shell 1 belongs to the prior art, and is not described herein again if the connection is through the bolt 4; the material selection of the upper shell 9 and the lower shell 1 belongs to the prior art, such as a magnetism-isolating aluminum alloy material, and is not described again;
the damping assembly comprises an inner damping assembly and an outer damping assembly; the inner damping component comprises an extruded magnetic core 29, an inner magnetic core ring 30 which is sleeved outside the extruded magnetic core 29 at a radial interval, an upper magnetic plate 28 which is arranged on the extruded magnetic core 29, and a magnetic conductive disc 31 and a lower magnetic plate 32 which are arranged below the extruded magnetic core 29; the upper magnetic plate 28 is arranged at the upper end of the inner magnetic core ring 20, and is beneficial to fixing the inner magnetic core ring 30; the extruded magnetic core 29 is provided with an exciting coil, i.e., an exciting coil I21; the radial direction here refers to the radial direction of the lower casing 1 of the barrel structure; a radial upper extrusion damping channel is formed between the extrusion magnetic core 29 and the upper magnetic plate 28, a radial lower extrusion damping channel is formed between the extrusion magnetic core 29 and the magnetic conduction disc 31, and the upper extrusion damping channel and the lower extrusion damping channel are communicated through a gap between the extrusion magnetic core 29 and the inner magnetic core ring 30; a circumferential radial damping channel communicated with the lower extrusion damping channel is formed between the magnetic conductive disc 31 and the lower magnetic plate 32 and is communicated through a corresponding axial through hole on the magnetic isolation base 3; the magnetic conductive disc 31 is sleeved outside the boss of the lower magnetic plate 32 in the radial direction; the magnetic induction intensity at the upper extrusion damping channel, the lower extrusion damping channel and the circumferential radial damping channel is controlled by the excitation coil I21, so that the higher damping force can be provided under low energy consumption, and the vibration isolation range of the magnetorheological vibration isolator can be expanded; the radial direction here refers to the radial direction of the magnetic conductive disk 31; an elastic basement membrane 2 is arranged in the lower shell 1; the elastic bottom membrane 2 is positioned below the magnetism isolating base 3 and fixed on the inner side wall of the lower shell 1, and the space above the elastic bottom membrane 2 is filled with magnetorheological fluid; the material selection of the elastic bottom membrane 2 belongs to the prior art, such as rubber with good elasticity and low cost, and is not described herein again; the damping buffering of the magnetorheological fluid in the upper space of the elastic base membrane is facilitated, and the vibration reduction is facilitated; the extrusion magnetic core 29 is fixedly connected with a connecting rod 13 penetrating through the upper shell 9 and is used for being connected with corresponding parts of an engine; the vibration reduction of the vibrating piece is facilitated.
In this embodiment, the outer damping assembly includes a conical inner magnetic core 27 disposed at the radial outer side of the inner magnetic core ring 30 and a conical outer magnetic core 26 adapted to the radial conical surface of the conical inner magnetic core 27; an inclined axial damping channel is formed between the conical inner magnetic core 27 and the conical outer magnetic core 26; the axial damping channels are communicated through corresponding axial through holes on the magnetism isolating base 3; the radial conical surface of the conical outer magnetic core 27 is positioned on the radial outer side of the conical inner magnetic core 26, the radial conical surface of the conical inner magnetic core 27 is positioned on the radial inner side of the conical outer magnetic core 26, and the radial conical surfaces of the conical inner magnetic core 27 and the conical outer magnetic core 26 are in conformal fit, so that an axial damping channel with an inclined angle is formed; the cone-shaped inner magnetic core 27 is provided with an excitation coil, namely an excitation coil II6, and has a constant current source different from the excitation coil I21; an inclined axial damping channel is formed between the conical inner magnetic core 27 and the conical outer magnetic core 26, and the included angle between the axial damping channel and the axial direction is 5-15 degrees, preferably 10 degrees; the axial direction refers to the axial direction of the lower shell 1 of the barrel-shaped structure; when the excitation coil I21 meets the vibration isolation requirement, no current is input to the excitation coil II6, the axial damping channel with the inclination angle serves as an inertia channel to relieve the dynamic hardening phenomenon of the magnetorheological fluid, and when the excitation coil I21 cannot meet the vibration isolation requirement, the current input is applied to the excitation coil II6, so that the output damping force of the vibration isolator can be increased, the vibration isolation frequency range is widened, and the vibration isolation requirements of vehicles under different working conditions are met; the damping component divides the inner cavity of the magneto-rheological vibration isolator into two parts and forms an upper cavity and a lower cavity which are communicated.
In this embodiment, the conical outer magnetic core 26 is provided with a radial wire channel; the wire channel is positioned at the side edge of the lower shell 1, and the wire channel corresponding to the conical outer magnetic core 26 is arranged, so that the control of induced current at the axial damping channel with an inclined angle is facilitated; the tapered inner magnetic core 27 is fixed on the magnetic isolation base 3, and the tapered outer magnetic core 26 is fixed on the side walls of the upper shell 9 and the lower shell 1, for example, by screws, which are not described herein again; a threaded hole is formed in the lower shell corresponding to the wire channel, and a sealing ring 12 and a sealing element 22 with a through hole are arranged in the threaded hole; the seal 22 is selected from the prior art, such as a sealing screw, to facilitate sealing of the wire passage, and will not be described in detail herein.
In the embodiment, the magnetic separation device further comprises a magnetic separation component for magnetic separation; the magnetism isolating assembly comprises an upper magnetism isolating ring I19 arranged at the top end of the upper magnetic plate 28, a magnetism isolating ring III20 arranged between the upper magnetic plate 28 and the conical inner magnetic core 27, a magnetism isolating sleeve 7 arranged between the inner magnetic core ring 30 and the conical inner magnetic core 27, and an upper magnetism isolating ring II8 arranged at the top end of the conical outer magnetic core 26; the upper magnetism isolating ring I19, the upper magnetic plate 28 and the magnetism isolating ring III20 are fixedly connected with the top end of the conical inner magnetic core 27; the fixed connection of the upper magnetism isolating ring I19, the upper magnetic plate 28 and the magnetism isolating ring III20 belongs to the prior art, for example, the connection through screws is not described herein again.
In this embodiment, the inner sides of the upper shell 9 and the lower shell 1 are provided with axially opposite step surfaces; the axial direction here refers to the axial direction of the lower case 1 of the barrel structure; the upper magnetism isolating ring II8, the conical outer magnetic core 26 and the magnetism isolating base 3 are sequentially and correspondingly matched and fixed between the axially opposite step surfaces; the upper magnetism isolating ring II8 at the top end of the conical outer magnetic core 26 and the magnetism isolating base 3 at the bottom end are propped against each other; a step platform used for fixing the elastic bottom membrane 2 on the step surface of the lower shell 1 is arranged on the radial outer side of the magnetism isolating base 3; a space for accommodating and fixing the elastic bottom membrane 2 is formed between the bottom end of the magnetism isolating base 3 and the step surface of the lower shell 1, so that the fixing of the elastic bottom membrane 2 by the step surface arranged on the magnetism isolating base 3 is facilitated; the lower half cavity filled with the magnetorheological fluid can be stably sealed.
In this embodiment, the lower magnetic plate 32 is fixedly connected to the magnetism isolating base 3, and an axially communicated inertial channel is arranged near the axis position, so as to be beneficial to relieving the dynamic hardening phenomenon of the magnetorheological fluid; the top end of the inertia channel is provided with a decoupling film 24 fixedly connected in a groove at the top end of the lower magnetic plate 32; the decoupling film 23 is favorable for effectively relieving the magnetorheological fluid in the lower extrusion channel when the magnetorheological fluid is dynamically hardened, and is favorable for widening the vibration isolation frequency range of the suspension; the magnetic isolation base 3 is correspondingly provided with a through hole communicated with the inertia channel; lower magnetic sheet 32 is fixed in on magnetic isolation base 3 through the fastener, does benefit to the steadiness that improves the structure, the selection of fastener belongs to prior art, like slotted cylinder holding screw, no longer gives details here.
In this embodiment, a plurality of thimbles 23 for adjusting the gap width of the circumferential damping channel are arranged in the circumferential damping channel; the thimble 23 is arranged to facilitate the adjustment of the output damping force of the vibration isolator.
In this embodiment, the top of the upper shell 9 is provided with an elastic sealing element 10 for sealing the upper shell 9, and the elastic sealing element 10 is used for damping vibration through damping change of magnetorheological fluid filled between the elastic sealing element 10 and the elastic base membrane 2 when vibration is generated; the arrangement of the elastic sealing element 10 and the elastic base membrane 2 is beneficial to relieving the dynamic hardening phenomenon of the magnetorheological fluid; the material of the elastic sealing element 10 belongs to the prior art, such as rubber with good elasticity and low cost, and the connection between the elastic sealing element 10 and the upper shell 9 belongs to the prior art, such as vulcanization, and is not described herein again; the connecting rod 13 is connected with the corresponding part of the engine after passing through the elastic sealing element 10 along the axial direction.
In this embodiment, the connecting rod 13 is fixedly connected to the extruded magnetic core 29 through the stud 18; a flow disturbing disc 17 is arranged between the stud 18 and the connecting rod 13; the dynamic stiffness of the vibration isolator during high-frequency vibration is effectively reduced; the extrusion magnetic core 29, the stud 18 and the connecting rod 13 are internally provided with a wire channel 15 along the axial direction; the extruded magnetic core 29, the stud 18 and the axial wire channel 15 arranged in the connecting rod 13 are communicated with each other; the control of induced current at the upper extrusion damping channel, the lower extrusion damping channel and the circumferential radial damping channel is facilitated; and a sealing ring is arranged in the wire channel 15, so that the sealing and the protection of the wire channel are facilitated.
In this embodiment, the elastic sealing member 10 is provided with a reinforcing block 14 for axially positioning the connecting rod 13; the reinforcing block 14 is provided with a liquid injection hole 11 and an exhaust hole 16; the liquid injection hole 11 and the exhaust hole 16 both comprise a threaded hole penetrating through the reinforcing block and an unthreaded hole positioned in the elastic sealing element 10, the threaded hole of the liquid injection hole 11 is communicated with the unthreaded hole, and the threaded hole of the exhaust hole 16 is communicated with the unthreaded hole; the liquid injection hole 11 and the exhaust hole 16 are sealed by a sealing ring and a sealing element; the sealing element is a slotted countersunk head screw, and the description is omitted; the top end of the connecting rod 13 is provided with an external thread for connecting corresponding parts of an engine, and the bottom end of the connecting rod 13 is provided with a screw hole for matching and connecting with the stud 18; power transmission is facilitated, and connection of the connecting rod 13 and the stud 18 is facilitated.
The working principle of the hybrid mode magnetorheological vibration isolator of the embodiment is as follows: when the vehicle power assembly drives the hybrid mode magneto-rheological vibration isolator to vibrate through the connecting rod 13, the damping force is increased along with the increase of the excitation current in the excitation coil; the output damping force of the vibration isolator and the adjustable range of the output damping force can be adjusted by controlling the excitation currents in the excitation coil I21 and the excitation coil II6 controlled by different constant current sources; the excitation coil I21 can provide larger damping force under low energy consumption and expand the vibration isolation range of the magneto-rheological vibration isolator by controlling the magnetic induction intensity at the upper extrusion damping channel, the lower extrusion damping channel and the circumferential radial damping channel; when the excitation coil I21 can not meet the vibration isolation requirement, current input is applied to the excitation coil II6, the output damping force of the vibration isolator can be adjusted through controlling the magnetic induction intensity at the axial damping channel with the inclined angle, the vibration isolation frequency range is adjusted, and therefore the vibration isolation requirement of vehicles under different working conditions is met.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (10)
1. A hybrid mode magnetorheological vibration isolator is characterized in that: the damping device comprises an upper shell, a lower shell buckled with the upper shell and damping components arranged in the upper shell and the lower shell; the damping assembly comprises an inner damping assembly and an outer damping assembly;
the inner damping assembly comprises an extrusion magnetic core, an inner magnetic core ring which is sleeved outside the extrusion magnetic core at radial intervals, an upper magnetic plate arranged on the extrusion magnetic core, and a magnetic conduction disc and a lower magnetic plate which are arranged below the extrusion magnetic core; a radial upper extrusion damping channel is formed between the extrusion magnetic core and the upper magnetic plate, a radial lower extrusion damping channel is formed between the extrusion magnetic core and the magnetic conduction disc, and the upper extrusion damping channel and the lower extrusion damping channel are communicated through a gap between the extrusion magnetic core and the inner magnetic core ring; a circumferential radial damping channel communicated with the lower extrusion damping channel is formed between the magnetic conductive disc and the lower magnetic plate and is communicated with a corresponding axial through hole on the magnetic isolation base; an elastic bottom film is arranged in the lower shell; the extrusion magnetic core is fixedly connected with a connecting rod penetrating through the upper shell and is used for being connected with a corresponding part of an engine.
2. The hybrid mode magnetorheological vibration isolator of claim 1, wherein: the outer damping assembly comprises a conical inner magnetic core arranged at the radial outer side of the inner magnetic core ring and a conical outer magnetic core matched with the radial conical surface of the conical inner magnetic core; an inclined axial damping channel is formed between the conical inner magnetic core and the conical outer magnetic core; the axial damping channel is communicated with a corresponding axial through hole on the magnetism isolating base.
3. The hybrid mode magnetorheological vibration isolator of claim 2, wherein: the conical outer magnetic core is provided with a radial lead channel; the conical inner magnetic core is fixed on the magnetic isolation base, and the conical outer magnetic core is fixed on the side walls of the upper shell and the lower shell; the lower shell corresponds wire passageway department is provided with the screw hole, the screw hole embeds there is the sealing washer and has the sealing member of through-hole.
4. The hybrid mode magnetorheological vibration isolator of claim 2, wherein: the magnetic isolation component is used for isolating magnetism; the magnetism isolating assembly comprises an upper magnetism isolating ring I arranged at the top end of the upper magnetic plate, a magnetism isolating ring III arranged between the upper magnetic plate and the conical inner magnetic core, a magnetism isolating sleeve arranged between the inner magnetic core ring and the conical inner magnetic core, and an upper magnetism isolating ring II arranged at the top end of the conical outer magnetic core; the upper magnetism isolating ring I, the upper magnetic plate and the magnetism isolating ring III are fixedly connected to the top end of the conical inner magnetic core.
5. The hybrid mode magnetorheological vibration isolator of claim 4, wherein: step surfaces which are opposite in axial direction are arranged on the inner sides of the upper shell and the lower shell; the upper magnetism isolating ring II, the conical outer magnetic core and the magnetism isolating base are sequentially and correspondingly matched and fixed between the axially opposite step surfaces; the radial outer side of the magnetic isolation base is provided with a step platform used for fixing the elastic basement membrane on the step surface of the lower shell.
6. The hybrid mode magnetorheological vibration isolator of claim 1, wherein: the lower magnetic plate is fixedly connected to the magnetic isolation base, an axially communicated inertia channel is arranged near the axis position, and a decoupling film fixedly connected in a groove at the top end of the lower magnetic plate is arranged at the top end of the inertia channel; the magnetism isolating base is correspondingly provided with a through hole communicated with the inertia channel.
7. The hybrid mode magnetorheological vibration isolator of claim 1, wherein: and a plurality of thimbles used for adjusting the gap width of the circumferential and radial damping channel are arranged in the circumferential and radial damping channel.
8. The hybrid mode magnetorheological vibration isolator of claim 1, wherein: the top of the upper shell is provided with an elastic sealing piece for plugging the upper shell, and the elastic sealing piece is used for realizing vibration reduction through damping change of magnetorheological fluid filled between the elastic sealing piece and the elastic bottom film when vibration is generated; and the connecting rod passes through the elastic sealing element along the axial direction and then is connected with a corresponding part of the engine.
9. The hybrid mode magnetorheological vibration isolator of claim 8, wherein: the connecting rod is fixedly connected to the extrusion magnetic core through a double-end stud; a flow disturbing disc is arranged between the double-end stud and the connecting rod; and the extrusion magnetic core, the stud and the connecting rod are internally provided with a wire channel along the axial direction.
10. The hybrid mode magnetorheological vibration isolator of claim 9, wherein: the elastic sealing element is provided with a reinforcing block for axially positioning the connecting rod; the reinforcing block is provided with a liquid injection hole and an exhaust hole; the connecting rod top is provided with the external screw thread that is used for connecting the corresponding part of engine, the connecting rod bottom is provided with the screw that is used for being connected with stud cooperation.
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