WO2017085995A1 - 磁気粘性流体緩衝器 - Google Patents
磁気粘性流体緩衝器 Download PDFInfo
- Publication number
- WO2017085995A1 WO2017085995A1 PCT/JP2016/076677 JP2016076677W WO2017085995A1 WO 2017085995 A1 WO2017085995 A1 WO 2017085995A1 JP 2016076677 W JP2016076677 W JP 2016076677W WO 2017085995 A1 WO2017085995 A1 WO 2017085995A1
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- WIPO (PCT)
- Prior art keywords
- piston
- core
- magnetorheological fluid
- shock absorber
- cylinder
- Prior art date
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Classifications
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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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- 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
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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
- F16F9/10—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using liquid only; using a fluid of which the nature is immaterial
- F16F9/14—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect
- F16F9/16—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts
- F16F9/18—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein
- F16F9/19—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein with a single cylinder and of single-tube type
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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
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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
- F16F2224/00—Materials; Material properties
- F16F2224/04—Fluids
- F16F2224/045—Fluids magnetorheological
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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
- F16F2228/00—Functional characteristics, e.g. variability, frequency-dependence
- F16F2228/06—Stiffness
- F16F2228/066—Variable stiffness
Definitions
- the present invention relates to a magnetorheological fluid shock absorber.
- JP2009-216210A is provided with a cylinder filled with a magnetorheological fluid, a piston formed with a passage for allowing the magnetorheological fluid to flow between the one side liquid chamber and the other side liquid chamber, and the piston.
- a variable damping force damper having a coil and whose damping force is controlled by applying a magnetic field generated by flowing a current to the coil to a magnetorheological fluid passing through a flow path.
- the damping force variable damper of JP2009-216210A when the magnetorheological fluid passes through the gap between the inner yoke and the outer yoke, when the coil is energized, a strong flow path resistance is caused by the magnetic field formed in the gap. Generates high damping force.
- Magnetorheological fluid is generally composed of a semi-fluid liquid in which fine particles having ferromagnetism such as iron powder are dispersed in a liquid composed of oil, grease, or the like.
- a magnetorheological fluid since the specific gravity of iron is larger than the specific gravity of liquid, iron powder may settle in the liquid. For this reason, it is possible to suppress the sedimentation of iron powder by increasing the viscosity of the liquid of the magnetorheological fluid.
- An object of the present invention is to provide a magnetorheological fluid shock absorber capable of obtaining a desired damping force.
- a magnetorheological fluid shock absorber using a magnetorheological fluid whose apparent viscosity changes depending on the strength of the magnetic field as a working fluid is formed by a cylinder in which the magnetorheological fluid is sealed and a magnetic material.
- a piston disposed movably in the cylinder; a first fluid chamber and a second fluid chamber defined by the piston in the cylinder; and a first fluid chamber formed between the inner circumferential surface of the cylinder and the outer circumferential surface of the piston.
- a throttle passage that communicates between the one fluid chamber and the second fluid chamber, and that provides resistance to the flow of the magnetorheological fluid passing therethrough; and an electromagnetic coil that is provided in the piston and generates a magnetic field that acts on the magnetorheological fluid flowing through the throttle passage.
- an adjustment member attached to the piston and capable of adjusting the length of the throttle passage.
- FIG. 1 is an axial sectional view of a magnetorheological fluid shock absorber according to a first embodiment of the present invention.
- 2 is a cross-sectional view taken along the line AA in FIG.
- FIG. 3 is a sectional view in the axial direction of a magnetorheological fluid shock absorber according to a second embodiment of the present invention.
- 4 is a cross-sectional view taken along the line BB in FIG.
- FIG. 5 is an axial sectional view of a magnetorheological fluid shock absorber according to a third embodiment of the present invention.
- FIG. 6 is a sectional view in the axial direction of a magnetorheological fluid shock absorber according to a modification of the present invention.
- FIG. 1 is an axial cross-sectional view showing a piston portion of a magnetorheological fluid shock absorber 100 (hereinafter simply referred to as “buffer 100”).
- the shock absorber 100 is provided between a vehicle body and an axle in a vehicle such as an automobile, for example, and generates a damping force that suppresses vibration of the vehicle body by an expansion / contraction operation.
- the shock absorber 100 is partitioned by a cylindrical cylinder 10 in which a magnetorheological fluid is sealed as a working fluid, a piston core 20 as a piston movably disposed in the cylinder 10, and the piston core 20 in the cylinder 10.
- the cylinder 10 is formed in a bottomed cylindrical shape.
- the apparent viscosity of the magnetorheological fluid sealed in the cylinder 10 changes due to the action of a magnetic field.
- Ferromagnetic particles such as iron are dispersed in a high-viscosity liquid composed of oil, grease, or the like. This is a semi-fluid liquid.
- the high viscosity in the present embodiment is a viscosity of about 3 to 20 Pa ⁇ s at 25 ° C. and a shear rate of 1 (1 / s), and a viscosity at 25 ° C. and a shear rate of 500 (1 / s).
- Is a viscosity of about 0.1 to 1.0 Pa ⁇ s.
- the viscosity of the magnetorheological fluid changes according to the strength of the applied magnetic field, and returns to the original state when the magnetic field is no longer affected.
- the piston rod 21 is formed coaxially with the piston core 20.
- the piston rod 21 has one end 21 a fixed to the piston core 20 and the other end 21 b extending to the outside of the cylinder 10.
- the piston rod 21 is formed in a cylindrical shape in which one end 21a and the other end 21b are opened.
- a pair of wires (not shown) for supplying a current to the electromagnetic coil 30a of the piston core 20 described later is passed through the hollow portion 21c of the piston rod 21.
- a male screw 21d screwed with the piston core 20 is formed on the outer periphery of the piston rod 21 in the vicinity of the one end 21a.
- the piston core 20 and the piston rod 21 are connected by screwing.
- a gas chamber (not shown) in which gas is sealed is partitioned by a free piston (not shown).
- the volume change in the cylinder 10 due to the advance / retreat of the piston rod 21 is compensated by the gas chamber.
- the piston core 20 includes a first core 22 attached to one end 21 a of the piston rod 21, a coil assembly 30 provided with an electromagnetic coil 30 a on the outer periphery, and a second core sandwiching the coil assembly 30 between the first core 22. 23.
- the first core 22, the second core 23 and the coil assembly 30 are fastened by a pair of bolts 24.
- the first core 22 and the second core 23 are formed of a magnetic material.
- the first core 22 has a main body portion 22a formed in a columnar shape, and a disk-shaped guide portion 22b that protrudes radially outward from the main body portion 22a and slides on the inner peripheral surface 10a of the cylinder 10.
- the main body portion 22a of the first core 22 is provided with a through hole 22c that penetrates the center in the axial direction.
- a female screw portion 22d that is screwed with a male screw 21d formed at one end 21a of the piston rod 21 is formed.
- the guide portion 22b is provided with a communication path 22e that allows the first fluid chamber 11 and the second fluid chamber 12 to communicate with each other. As shown in FIG. 2, a plurality of communication paths 22e are formed in an arc shape.
- the second core 23 has a main body 23a formed in a columnar shape and a support 23b having a smaller diameter than the main body 23a.
- the outer shape of the main body 23 a is formed to be equal to the outer shape of the main body 22 a of the first core 22.
- the coil assembly 30 is formed by molding a resin in a state where the annular electromagnetic coil 30a is inserted.
- the coil assembly 30 includes a columnar portion 30b that fits into the through hole 22c of the first core 22, a connecting portion 30c that is sandwiched between the first core 22 and the second core 23, and an electromagnetic coil 30a provided therein.
- a coil mold portion 30d The inner peripheral surface of the coil mold portion 30 d is fitted to the outer peripheral surface of the support portion 23 b of the second core 23. As a result, the coil assembly 30 is supported by the support portion 23 b of the second core 23.
- the shock absorber 100 is formed between the inner peripheral surface 10a of the cylinder 10 and the outer peripheral surface of the piston core 20 as a damping force generating element, and the throttle passage 13 that communicates the first fluid chamber 11 and the second fluid chamber 12 with each other. And an electromagnetic coil 30 a that generates a magnetic field that acts on the magnetorheological fluid that is provided in the piston core 20 and flows through the throttle passage 13.
- the throttle passage 13 is formed between the inner peripheral surface 10a of the cylinder 10 and the outer peripheral surface of the piston core 20, specifically, the inner peripheral surface 10a of the cylinder 10, the first core 22, the coil assembly 30, and the second core 23. It is formed in an annular shape between the outer peripheral surfaces of the two.
- the flow passage area of the throttle passage 13 is formed to be smaller than the total flow passage area of the plurality of communication passages 22e provided in the guide portion 22b.
- the throttle passage 13 gives resistance to the flow of the magnetorheological fluid passing when the shock absorber 100 expands and contracts and the magnetorheological fluid moves between the first fluid chamber 11 and the second fluid chamber 12. It is.
- the shock absorber 100 generates a damping force by applying resistance to the flow of the magnetorheological fluid passing through the throttle passage 13.
- the electromagnetic coil 30a forms a magnetic field by a current supplied from the outside.
- the strength of the magnetic field increases as the current supplied to the electromagnetic coil 30a increases.
- the first core 22 and the second core 23 are formed of a magnetic material, they constitute a magnetic path that guides a magnetic flux generated around the electromagnetic coil 30a.
- the shock absorber 100 is expanded and contracted, and the piston core 20 moves in the cylinder 10.
- the magnetorheological fluid moves between the first fluid chamber 11 and the second fluid chamber 12 through the throttle passage 13 and the communication passage 22e.
- the shock absorber 100 generates a damping force when the magnetorheological fluid passing through the throttle passage 13 is given resistance by the throttle passage 13.
- the adjustment of the damping force generated by the shock absorber 100 is performed by changing the amount of current applied to the electromagnetic coil 30a and changing the strength of the magnetic field acting on the magnetorheological fluid flowing through the throttle passage 13.
- the apparent viscosity of the magnetorheological fluid changes depending on the strength of the applied magnetic field. More specifically, as the current supplied to the electromagnetic coil 30a increases, the strength of the magnetic field generated around the electromagnetic coil 30a increases. Thereby, the apparent viscosity of the magnetorheological fluid flowing through the throttle passage 13 is increased, and the damping force generated by the shock absorber 100 is increased.
- the damping force in addition to the damping force generated by the resistance of the throttle passage 13, the damping force can be adjusted by changing the energization amount to the electromagnetic coil 30a.
- the piston core 20 is not provided with a flux ring, the flow passage area of the throttle passage 13 can be increased. Thereby, even if the viscosity of a magnetorheological fluid becomes high, the fluidity
- the spacer 40 as an adjustment member is attached to one end part of the piston core 20. Below, the spacer 40 is demonstrated.
- the spacer 40 is a columnar member formed to have substantially the same outer shape as that of the second core 23 (piston core 20).
- the spacer 40 is attached to the one end surface of the second core 23 opposite to the coil assembly 30 with bolts 41.
- the length of the throttle passage 13 can be increased by attaching the spacer 40.
- the resistance generated by the throttle passage 13 can be increased.
- the resistance generated by the throttle passage 13 can be adjusted by adjusting the length of the spacer 40 in the axial direction.
- the spacer 40 may be annular, or may have a bottomed cylindrical shape with an opening on the second core 23 side. Thereby, the spacer 40 can be reduced in weight.
- the material of the spacer 40 may be either magnetic or nonmagnetic.
- the spacer 40 and the second core 23 are attached so that the flat end surfaces are in contact with each other. Instead, a convex portion is provided on one side and a concave portion is provided on the other side. It may be provided and configured to fit these. According to this configuration, since the spacer 40 and the piston core 20 are fitted to each other, the axial centers of the spacer 40 and the piston core 20 are not shifted. Thereby, the throttle passage 13 can be configured as an annular channel having a uniform opening.
- a throttle passage 13 is formed between the inner peripheral surface 10 a of the cylinder 10 and the outer peripheral surface of the piston core 20, and a spacer 40 capable of adjusting the length of the throttle passage 13 is attached to the piston core 20. It is done. Thereby, a desired damping force can be obtained in the throttle passage 13 by appropriately adjusting the length of the spacer 40 according to the viscosity of the magnetorheological fluid. That is, by adjusting the length of the spacer 40 in the axial direction, the length of the throttle passage 13 can be changed and the damping force of the shock absorber 100 can be adjusted.
- the throttle passage 13 is formed in an annular shape, the flow of the magnetorheological fluid flowing through the throttle passage 13 is made uniform. Therefore, since a uniform force acts on the piston core 20 when the magnetorheological fluid flows, the piston core 20 can be prevented from shaking.
- the piston core 20 since the piston core 20 includes the guide portion 22b that slides on the inner peripheral surface 10a of the cylinder 10, the piston core 20 is not shaken in the cylinder 10 when moving in the cylinder 10. Therefore, the shape of the throttle passage 13 does not change. Therefore, it is possible to always give a certain resistance to the flow of the magnetorheological fluid.
- the piston core 20 can be shared.
- the shock absorber 100 can use a highly viscous magnetorheological fluid. As described above, by using a high-viscosity magnetorheological fluid, it is possible to suppress the iron powder from being deposited on the bottom of the cylinder 10, so that the damping force can be stably generated.
- the viscosity of the magnetorheological fluid increases in a low temperature environment. Therefore, not only the high-viscosity magnetorheological fluid as described above, but also in such a situation, the damping force can be stably generated by using the shock absorber 100.
- a shock absorber 200 according to a second embodiment of the present invention will be described with reference to FIGS. 3 and 4. Below, it demonstrates centering on a different point from the said 1st Embodiment, the same code
- the shock absorber 100 according to the first embodiment has a configuration in which the guide portion 22b is provided on the first core 22, whereas the shock absorber 200 according to the second embodiment includes the first core 22, the coil assembly 30, and the second core.
- the difference is that the third core 150 is provided on the outer peripheral portion of the core 23.
- the shock absorber 200 includes a piston core 120 that is movably disposed in the cylinder 10.
- the piston core 120 includes a first core 122 attached to one end 21 a of the piston rod 21, a coil assembly 30 provided with an electromagnetic coil 30 a on the outer periphery, and a second core sandwiching the coil assembly 30 between the first core 22. And a third core 150 provided so as to be in contact with the outer peripheral surfaces of the first core 122, the coil assembly 30, and the second core 23.
- the first core 122 and the second core 23 are made of a magnetic material, and the third core 150 is made of a nonmagnetic material.
- the first core 122 has a main body part 122a formed in a columnar shape and a small diameter part 122b formed at one end of the main body part 122a with a smaller diameter than the main body part 122a.
- the first core 122 is provided with a through hole 122c that penetrates the center in the axial direction.
- the through hole 122c is formed with an internal thread portion 122d that engages with an external thread 21d formed at one end 21a of the piston rod 21.
- the third core 150 includes an annular main body 151 (see the dotted line portion in FIG. 4) and a guide portion 152 that is attached to the main body 151 and guides the piston core 120.
- the outer shape of the main body 151 is formed to be equal to the outer shapes of the main body 122 a of the first core 122 and the main body 23 a of the second core 23. Further, the axial length of the main body portion 151 is formed to be equal to the axial length of the coil mold portion 30 d of the coil assembly 30.
- the main body 151 is supported by the coil assembly 30 on the inner periphery, and is sandwiched between the first core 122 and the second core 23 in the axial direction.
- the first core 122, the second core 23, and the coil assembly 30 are fastened by a pair of bolts 24. Thereby, the 1st core 122, the 2nd core 23, the coil assembly 30, and the 3rd core 150 are integrated.
- the guide portion 152 is formed such that the axial length is equal to the axial length when the first core 122, the second core 23, and the coil assembly 30 are integrated. As shown in FIG. 4, the guide portion 152 is formed in a sector shape in the radial direction so that the outer peripheral surface can slide on the inner peripheral surface 10 a of the cylinder 10. Four guide portions 152 are provided at equal intervals in the circumferential direction. A constriction passage 113 that connects the first fluid chamber 11 and the second fluid chamber 12 is formed between the adjacent guide portions 152.
- a spacer 140 is attached to one end of the piston core 120.
- the spacer 140 is formed so that the cross-sectional shape in the radial direction is the same as that of the piston core 120.
- the main body 141 of the spacer 140 is formed in a columnar shape having the same outer shape as the main body 122 a of the first core 122 and the main body 23 a of the second core 23.
- a guide portion 142 having the same cross-sectional shape as the guide portion 152 of the third core 150 is formed on the outer periphery of the main body portion 141 at a position that matches the guide portion 152 in the circumferential direction.
- a narrowing passage 113 is formed between the adjacent guide portions 142 of the spacer 140.
- the inner peripheral surface 10a of the cylinder 10 the outer peripheral surface of the main body 151 of the first core 122, the second core 23, and the third core 150, the adjacent guide portion 152 of the third core 150, A throttle passage 113 is formed between them, and a spacer 140 capable of adjusting the length of the throttle passage 113 is attached to the piston core 120.
- a spacer 140 capable of adjusting the length of the throttle passage 113 is attached to the piston core 120.
- the third core 150 includes the guide portion 152 that slides on the inner peripheral surface 10 a of the cylinder 10, it is possible to prevent the piston core 120 from shaking in the cylinder 10 when moving in the cylinder 10.
- the guide portion 142 and the guide portion 152 the guide can be provided long with respect to the axial direction of the piston core 120, and thus the piston core 120 can be stably guided.
- a shock absorber 300 according to a third embodiment of the present invention will be described with reference to FIG. Below, it demonstrates centering on a different point from the said 1st Embodiment, the same code
- the shock absorber 100 of the first embodiment is of a single rod type
- the shock absorber 300 of the third embodiment is of a double rod type
- the shock absorber 100 of the first embodiment is guided by the piston core 20.
- the shock absorber 300 according to the third embodiment is different in that it is guided by the piston rods 21 provided on both sides of the piston core 220 while being guided by the portion 22b.
- the shock absorber 300 is a double rod type shock absorber in which piston rods 21 extending to the outside of the cylinder 10 are connected to both sides of the piston core 220.
- the piston rod 21 is supported by a bearing (not shown) provided on a cover member (not shown) that closes the openings at both ends of the cylinder 10.
- the piston core 220 includes a first core 222 attached to one end 21 a of one piston rod 21 extending to the outside of the cylinder 10, a coil assembly 30 provided with an electromagnetic coil 30 a on the outer periphery, and the first core 222. And a second core 223 attached to one end 21a of the other piston rod 21.
- the first core 222 and the second core 223 are formed of a magnetic material.
- the first core 222 has a main body part 222a formed in a substantially cylindrical shape, and a small diameter part 222b formed at one end of the main body part 222a with a smaller diameter than the main body part 222a.
- the first core 222 is provided with a through hole 222c that penetrates the center in the axial direction.
- the through hole 222c is formed with a female screw portion 222d that is screwed with a male screw 21d formed at one end 21a of the piston rod 21.
- the second core 223 includes a body portion 223a formed in a columnar shape, a support portion 223b formed at one end of the body portion 223a with a smaller diameter than the body portion 223a, and the other end of the body portion 223a than the body portion 223a. And a small diameter portion 223c formed to have a small diameter.
- the outer shape of the main body 223 a is formed to be equal to the outer shape of the main body 222 a of the first core 222.
- the small diameter portion 223c of the second core 223 is formed with a female screw portion 223d that is screwed with a male screw 21d formed at one end 21a of the other piston rod 21.
- the throttle passage 13 is formed between the inner peripheral surface 10 a of the cylinder 10 and the outer peripheral surface of the piston core 220, specifically, the inner peripheral surface 10 a of the cylinder 10, the first core 222, and the coil assembly 30. And between the outer peripheral surface of the 2nd core 223, it forms in an annular
- a spacer 240 is attached to one end surface of the piston core 220 on the second core 223 side.
- the outer shape of the spacer 240 is formed to be equal to the outer shape of the piston core 220.
- the spacer 240 is formed in an outer shape equal to the outer shape of the main body portion 122 a of the first core 122 and the main body portion 23 a of the second core 23.
- the spacer 240 is formed in an annular shape having an inner diameter that can be fitted to the outer periphery of the small diameter portion 223c of the second core 223.
- the spacer 240 is attached to one end of the piston core 220, whereby the length of the throttle passage 13 can be increased. Thereby, even if the flow path area of the throttle passage 13 is increased, the resistance generated by the throttle passage 13 can be increased. Furthermore, the resistance generated by the throttle passage 13 can be adjusted by adjusting the axial length of the spacer 240.
- the piston rods 21 attached to both sides of the piston core 220 are supported by bearings provided at both ends of the cylinder 10. Therefore, the piston core 220 does not shake even if the piston core 220 is not provided with a guide member.
- the spacer 240 may be provided on the end surface on the first core 222 side. Further, in the shock absorber 300, the above-described gas chamber (not shown) and free piston (not shown) may not be provided.
- the shock absorbers 100, 200, and 300 include a cylinder 10 in which a magnetorheological fluid is sealed, a piston (piston core 20, 120, 220) that is formed of a magnetic material and is movably disposed in the cylinder 10, and the cylinder 10.
- the first fluid chamber 11 and the second fluid chamber 12 defined by the pistons (piston cores 20, 120, 220), the inner peripheral surface 10a of the cylinder 10 and the outer peripheral surfaces of the pistons (piston cores 20, 120, 220).
- the first fluid chamber 11 and the second fluid chamber 12 are formed between the throttle passages 13 and 113 and the pistons (piston cores 20, 120 and 220).
- an electromagnetic coil 30a for generating a magnetic field acting on the magnetorheological fluid flowing through the throttle passages 13, 113, and a piston can adjust the length of the attached throttle passage 13, 113 to adjustment member (spacer 40, 140, 240), the.
- the throttle passages 13 and 113 are formed between the inner peripheral surface 10a of the cylinder 10 and the outer peripheral surface of the piston (piston core 20, 120, 220), and the adjusting members (spacers 40, 140, 240). ) To adjust its length. Thereby, resistance can be appropriately given to the magnetorheological fluid, and a desired damping force can be obtained.
- the adjustment members (spacers 40 and 240) have substantially the same outer shape as the pistons (piston cores 20 and 220).
- the adjustment member spacers 40, 140, and 240
- the piston piston cores 20, 120, and 220
- the adjustment member (spacer 40, 140, 240) and the piston (piston core 20, 120, 220) are configured to be fitted to each other, so the adjustment member (spacer 40, 140, 240). And the axis of the piston (piston core 20, 120, 220) does not shift.
- the throttle passages 13 and 113 can be configured as channels having a uniform opening degree.
- the adjustment member (spacer 40, 140, 240) is attached to one end of the piston (piston core 20, 120, 220).
- the piston (piston cores 20, 120, 220) is constituted by a plurality of members, and the adjustment member (spacer 340) is constituted by a plurality of members constituting the pistons (piston cores 20, 120, 220). Between the members.
- the adjusting members are made of a magnetic material.
- a spacer can be provided on the piston rod 21 side (first core 22, 122 side).
- the spacers 40 and 240 are provided at one end portions of the piston cores 20 and 220, respectively.
- a spacer 340 may be provided therebetween.
- the spacer 340 is formed of a magnetic material.
- the spacer 340 may be provided between the coil assembly 30 and the second core 23.
- the coil assembly 30 is supported by the second cores 23 and 223, but may be configured to be supported by the first cores 22, 122, and 222.
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Abstract
Description
図1は、磁気粘性流体緩衝器100(以下、単に「緩衝器100」という)のピストン部を示す軸方向の断面図である。緩衝器100は、例えば、自動車等の車両において車体と車軸との間に設けられ、伸縮作動によって車体の振動を抑える減衰力を発生するものである。
次に、図3及び図4を参照して本発明の第2実施形態に係る緩衝器200について説明する。以下では、上記第1実施形態と異なる点を中心に説明し、上記第1実施形態の緩衝器と同一の構成には同一の符号を付して説明を省略する。
次に、図5を参照して本発明の第3実施形態に係る緩衝器300について説明する。以下では、上記第1実施形態と異なる点を中心に説明し、上記第1実施形態の緩衝器と同一の構成には同一の符号を付して説明を省略する。
Claims (6)
- 磁場の強さによって見かけの粘度が変化する磁気粘性流体を作動流体とする磁気粘性流体緩衝器であって、
前記磁気粘性流体が封入されるシリンダと、
磁性材によって形成され、前記シリンダ内に移動自在に配置されるピストンと、
前記シリンダ内において前記ピストンによって区画される第一流体室及び第二流体室と、
前記シリンダの内周面と前記ピストンの外周面との間に形成されて前記第一流体室と前記第二流体室を連通するとともに、通過する前記磁気粘性流体の流れに抵抗を与える絞り通路と、
前記ピストンに設けられ前記絞り通路を流れる前記磁気粘性流体に作用する磁場を発生する電磁コイルと、
前記ピストンに取り付けられ前記絞り通路の長さを調整可能な調整部材と、
を備える磁気粘性流体緩衝器。 - 請求項1に記載の磁気粘性流体緩衝器であって、
前記調整部材は、前記ピストンの外形と略同じ外形である磁気粘性流体緩衝器。 - 請求項1に記載の磁気粘性流体緩衝器であって、
前記調整部材と前記ピストンとは互いに嵌合するように構成される磁気粘性流体緩衝器。 - 請求項1に記載の磁気粘性流体緩衝器であって、
前記調整部材は、前記ピストンの一端部に取り付けられる磁気粘性流体緩衝器。 - 請求項1に記載の磁気粘性流体緩衝器であって、
前記ピストンは、複数の部材によって構成され、
前記調整部材は、前記ピストンを構成する前記複数の部材の間に設けられる磁気粘性流体緩衝器。 - 請求項5に記載の磁気粘性流体緩衝器であって、
前記調整部材は、磁性材によって形成される磁気粘性流体緩衝器。
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KR1020187009649A KR20180049041A (ko) | 2015-11-19 | 2016-09-09 | 자기 점성 유체 완충기 |
DE112016005316.9T DE112016005316T5 (de) | 2015-11-19 | 2016-09-09 | Magnetorheologischer Dämpfer |
US15/768,385 US20180306267A1 (en) | 2015-11-19 | 2016-09-09 | Magneto-rheological fluid damper |
CN201680064368.1A CN108350973A (zh) | 2015-11-19 | 2016-09-09 | 磁粘滞性流体缓冲器 |
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JP2015226548A JP6093837B1 (ja) | 2015-11-19 | 2015-11-19 | 磁気粘性流体緩衝器 |
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JP (1) | JP6093837B1 (ja) |
KR (1) | KR20180049041A (ja) |
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Publication number | Priority date | Publication date | Assignee | Title |
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Publication number | Priority date | Publication date | Assignee | Title |
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CN109268432B (zh) * | 2018-11-16 | 2023-08-18 | 广州大学 | 一种阻尼器 |
EP3719248B8 (en) * | 2019-04-02 | 2023-03-22 | Grant Prideco, Inc. | System and method for improved heave compensation |
CN111005955A (zh) * | 2019-12-30 | 2020-04-14 | 柳州职业技术学院 | 一种双重调节式磁流变阻尼器及其动感单车 |
CN112855826B (zh) * | 2020-12-24 | 2022-06-21 | 湖北航天飞行器研究所 | 节能自锁式磁流变阻尼器 |
CN115076283A (zh) * | 2022-06-27 | 2022-09-20 | 西格迈股份有限公司 | 具有磁流变液e型流通通道的新能源汽车用磁流变减震器 |
CN116025660B (zh) * | 2023-03-10 | 2024-09-10 | 重庆大学 | 无源机械连续可调式磁流变阻尼器 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009150411A (ja) * | 2007-12-18 | 2009-07-09 | Honda Motor Co Ltd | 減衰力可変ダンパ |
JP2009216210A (ja) * | 2008-03-12 | 2009-09-24 | Honda Motor Co Ltd | 減衰力可変ダンパ |
JP2013181605A (ja) * | 2012-03-01 | 2013-09-12 | Kyb Co Ltd | 磁気粘性流体緩衝器 |
JP2016098950A (ja) * | 2014-11-25 | 2016-05-30 | Kyb株式会社 | 減衰バルブ及び緩衝器 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6655511B1 (en) * | 2002-10-08 | 2003-12-02 | Delphi Technologies, Inc. | Magnetorheological piston having a core |
US7232016B2 (en) * | 2003-12-08 | 2007-06-19 | General Motors Corporation | Fluid damper having continuously variable damping response |
US8051961B2 (en) * | 2007-10-30 | 2011-11-08 | Honda Motor Co., Ltd. | Magneto-rheological damper |
DE102008042078B3 (de) * | 2008-09-15 | 2010-07-22 | Zf Friedrichshafen Ag | Schwingungsdämpfer mit amplitudenabhängiger Dämpfkraft |
JP5489351B2 (ja) * | 2010-06-09 | 2014-05-14 | 株式会社東芝 | 洗濯機 |
JP5986757B2 (ja) * | 2012-03-01 | 2016-09-06 | Kyb株式会社 | 磁気粘性流体緩衝器 |
JP5865801B2 (ja) * | 2012-08-06 | 2016-02-17 | Kyb株式会社 | 磁気粘性流体緩衝器 |
JP6093612B2 (ja) * | 2013-03-21 | 2017-03-08 | Kyb株式会社 | 磁気粘性流体緩衝器 |
JP6071130B2 (ja) * | 2013-03-21 | 2017-02-01 | Kyb株式会社 | 磁気粘性流体緩衝器 |
CN207378038U (zh) * | 2017-11-08 | 2018-05-18 | 华东交通大学 | 一种具有旁通回路的磁流变阻尼器活塞结构 |
-
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- 2016-09-09 CN CN201680064368.1A patent/CN108350973A/zh active Pending
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Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009150411A (ja) * | 2007-12-18 | 2009-07-09 | Honda Motor Co Ltd | 減衰力可変ダンパ |
JP2009216210A (ja) * | 2008-03-12 | 2009-09-24 | Honda Motor Co Ltd | 減衰力可変ダンパ |
JP2013181605A (ja) * | 2012-03-01 | 2013-09-12 | Kyb Co Ltd | 磁気粘性流体緩衝器 |
JP2016098950A (ja) * | 2014-11-25 | 2016-05-30 | Kyb株式会社 | 減衰バルブ及び緩衝器 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112105836A (zh) * | 2018-07-03 | 2020-12-18 | 纽摩泰科有限公司 | 磁流变阻尼器活塞 |
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JP6093837B1 (ja) | 2017-03-08 |
KR20180049041A (ko) | 2018-05-10 |
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