CN109723749B - Rotary magnetorheological damper - Google Patents
Rotary magnetorheological damper Download PDFInfo
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- CN109723749B CN109723749B CN201910052891.8A CN201910052891A CN109723749B CN 109723749 B CN109723749 B CN 109723749B CN 201910052891 A CN201910052891 A CN 201910052891A CN 109723749 B CN109723749 B CN 109723749B
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Abstract
The invention discloses a rotary magnetorheological damper, which comprises a first rotating shaft, a second rotating shaft and a third rotating shaft, wherein the first rotating shaft is connected with the second rotating shaft through a first connecting rod; a first gear is fixed on the first rotating shaft, a second gear and a third gear are fixed on the second rotating shaft, and a fourth gear is fixed on the third rotating shaft; a damping device is arranged below a fourth gear of the third rotating shaft; the damping device comprises an upper cover, a lower cover, a piston and a sleeve; the third rotating shaft penetrates through the upper cover, the lower cover and the piston; four convex cavities which are uniformly distributed at intervals of 90 degrees along the axial direction are arranged in the piston, an annular groove is formed in the sleeve, and the axial heights of the annular groove and the convex cavities are equal; a T-shaped moving block is arranged in the convex cavity and can move in the convex cavity and the annular groove. The invention has simple structure and can achieve good damping effect in a rotary mechanical structure.
Description
Technical Field
The invention relates to the technical field of dampers, in particular to a rotary magnetorheological damper.
Background
The magnetorheological fluid is a suspension formed by mixing tiny soft magnetic particles with high magnetic conductivity and low magnetic hysteresis and non-magnetic conductive liquid. Under the condition of zero magnetic field, the particle distribution of the magnetorheological fluid is disordered and the Newtonian fluid with low viscosity is presented; under the action of magnetic field, the material is regularly arranged in chain or chain bundle form, and can be instantly changed from Newtonian fluid into high-viscosity plastic Bingham fluid which is difficult to flow. This change in the magnetorheological fluid is reversible and the magnitude of the damping force can be controlled by controlling the magnitude of the strength of the magnetic field.
The magneto-rheological damper applied to the market at present is a linear magneto-rheological damper generally, and comprises an oil cylinder, a piston rod, magneto-rheological fluid and a guide rod, wherein the piston can do linear reciprocating motion in the cylinder body along the axial direction. When the load changes to generate impact, the driving piston makes reciprocating linear motion in the cylinder, and the magnetorheological fluid passes through a small hole in the piston or a gap between the piston and the cylinder, so that damping force is generated. The piston rod type magnetorheological damper is large in length and size, and the installation is easily limited by the size. The small damper with the structure has the damping effect which can not meet the damping design requirement; and the piston rod type magnetorheological damper is not suitable for the vibration reduction of the rotary mechanism.
Disclosure of Invention
Based on the problems, the invention provides a rotary magneto-rheological damper, which realizes the miniaturization of the structure, achieves the designed damping effect and is suitable for the damping of a rotary mechanism;
the adopted technical scheme is as follows: the rotary magneto-rheological damper comprises a first rotating shaft, a second rotating shaft, a third rotating shaft and a damping device fixed on the third rotating shaft; the first rotating shaft is coaxial with the third rotating shaft, and the tail end of the first rotating shaft is not contacted with the head end of the third rotating shaft; the second rotating shaft is parallel to the first rotating shaft; the second rotating shaft and the third rotating shaft are parallel; a first gear is fixed on the first rotating shaft, a second gear and a third gear are fixed on the second rotating shaft, and a fourth gear is fixed on the third rotating shaft; the first gear is externally meshed with the second gear, and the third gear is externally meshed with the fourth gear; the third gear is positioned below the second gear; the damping device is positioned below the fourth gear;
the damping device comprises an upper cover, a lower cover, a piston and a sleeve; the third rotating shaft penetrates through the upper cover, the lower cover and the piston, and the upper cover and the lower cover are coaxial with the third rotating shaft; the third rotating shaft is connected with the upper cover and the lower cover through bearings; the piston is positioned between the upper cover and the lower cover and is coaxial with the third rotating shaft; a sleeve is arranged outside the piston; gaps among the piston, the upper cover and the lower cover form a first magnetorheological fluid damping gap;
a convex cavity is formed in the piston, and a spring, a first block, a second block and a T-shaped moving block are fixed in the convex cavity; one end of the spring is connected with the inner wall of the convex cavity, and the other end of the spring is connected with the T-shaped moving block; the end of the wide part of the T-like moving block is in contact with the upper wall and the lower wall of the convex cavity, and the distance between the narrow part of the T-like moving block and the inner wall of the convex cavity is a second magnetorheological fluid damping gap; the T-like moving block slides relatively along the inner wall of the convex cavity, the second blocking block is arranged at the opening of the convex cavity, and magnetorheological fluid is filled in the convex cavity;
the sleeve is provided with an annular groove, and the axial height of the annular groove is equal to that of the convex cavity; the upper part of the annular groove is provided with a first excitation coil, the lower part of the annular groove is provided with a second excitation coil, and the outer side of the annular groove covers a third excitation coil; when the T-like moving block slides to the annular groove, a third magnetorheological fluid damping gap is formed between the narrow end of the T-like moving block and the inner wall of the annular groove.
Four convex cavities which are uniformly distributed along the axial direction at 90-degree intervals are arranged in the piston.
The spring is in an initial state of extension and has certain tensile force.
The T-shaped moving block initially bears the tensile force of the spring, and the lower end of the T-shaped moving block is blocked by the first blocking block and is fixed and limited in the convex cavity.
The first block is square.
The second block is square and one end of the second block is protruded.
The first magnetorheological fluid damping gap, the second magnetorheological fluid damping gap and the third magnetorheological fluid damping gap are communicated, and the third magnetorheological fluid damping gap is excessively formed in the second magnetorheological fluid damping gap.
The first excitation coil is symmetrical to the second excitation coil.
The invention relates to a rotary magnetorheological damper, which takes a first rotating shaft as an input rotating shaft and a third rotating shaft as an output rotating shaft; the rotation speed of the third rotating shaft of the output rotating shaft is adjusted by utilizing the rotation speed input by the first rotating shaft and through the gears arranged on the first rotating shaft, the second rotating shaft and the third rotating shaft and the set transmission ratio. The third rotating shaft rotates, a piston in a damping device on the third rotating shaft rotates at the same rotating speed, a magnetic field generated by electrifying the first magnet exciting coil, the second magnet exciting coil and the third magnet exciting coil acts on a magnetorheological fluid gap, and a chain formed by cutting the piston generates damping force when the piston rotates. The spring is in an extension state at the initial moment, and the T-shaped block is in a fixed position due to the limiting function of the first blocking block; when the centrifugal force generated by rotation of the third rotating shaft is smaller than the tensile force of the spring, the T-shaped block is static, and the damping force generated by cutting is mainly generated by the rotation cutting of the piston; when the rotating speed is further increased and the centrifugal force is correspondingly increased and is greater than the tensile force of the spring, the T-shaped block is separated from the first blocking block and moves outwards along the inner wall of the convex cavity, and the top end of the T-shaped block passes through the narrow magnetorheological fluid gap and enters the annular groove. The convex cavity and the annular groove can be set according to actual requirements of products.
Drawings
FIG. 1 is an overall external front view of a rotary magnetorheological damper of the present invention;
FIG. 2 is a longitudinal sectional view of the rotary magnetorheological damper of the present invention;
FIG. 3 is an enlarged view of portion B of FIG. 2;
FIG. 4 is a cross-sectional view of a damper assembly in the rotary magnetorheological damper of the present invention.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Referring to fig. 1 to 4, the rotary magnetorheological damper comprises a first rotating shaft 1, a second rotating shaft 4, a third rotating shaft 7, and a damping device 8 fixed on the third rotating shaft; the first rotating shaft 1 is coaxial with the third rotating shaft 7, and the tail end of the first rotating shaft 1 is not contacted with the head end of the third rotating shaft 7; the second rotating shaft 4 is parallel to the first rotating shaft 1; the second rotating shaft 4 and the third rotating shaft 7 are parallel; a first gear 2 is fixed on the first rotating shaft 1, a second gear 3 and a third gear 5 are fixed on the second rotating shaft 4, and a fourth gear 6 is fixed on the third rotating shaft 7; the first gear 2 is externally meshed with the second gear 3, and the third gear 5 is externally meshed with the fourth gear 6; the third gear 5 is positioned below the second gear 3; the damping device 8 is positioned below the fourth gear 6;
wherein, the damping device 8 comprises an upper cover 19, a lower cover 15, a piston 9 and a sleeve 13; the third rotating shaft 7 penetrates through the upper cover 19, the lower cover 15 and the piston 9, and the upper cover 19, the lower cover and the third rotating shaft 15 are coaxial and are connected through a bearing; the piston 9 is positioned between the upper cover 19 and the lower cover 15 and is coaxial with the third rotating shaft 7; a sleeve 13 is arranged outside the piston 9; the gap among the piston 9, the upper cover 19 and the lower cover 15 forms a first magnetorheological fluid damping gap;
the interior of the piston 9 is provided with convex cavities 11, and four convex cavities are uniformly distributed in the piston at intervals of 90 degrees along the axial direction; a spring 10, a first stop block 20, a second stop block 21 and a T-shaped moving block 12 are fixed in the convex cavity; the T-like moving block 12 slides relatively along the slideway on the inner wall of the convex cavity, one end of the T-like moving block 12 is in contact with the upper wall and the lower wall of the convex cavity, and the other end of the T-like moving block is in distance with the upper wall and the lower wall of the convex cavity 11, wherein the distance is a second magnetorheological fluid damping gap; one end of the spring 10 is connected with the inner wall of the convex cavity, and the other end of the spring is connected with one end of the T-shaped moving block; the spring 10 is in an initial state of an extension state, the T-shaped moving block 12 bears the pulling force of the spring, and the lower end of the T-shaped moving block is blocked by the first blocking block 20 and is fixed and limited in the convex cavity 11; the first block 20 is square; the second block 21 is square and one end of the second block is protruded; the second block 21 is arranged at the opening of the convex cavity 11, and magnetorheological fluid is filled in the convex cavity 11.
The sleeve 13 is provided with an annular groove 14, and the axial height of the annular groove 14 is equal to that of the convex cavity 11; a first excitation coil 16 is arranged at the upper part of the annular groove 14, a second excitation coil 17 is arranged at the lower part of the annular groove, and a third excitation coil 18 is covered outside the annular groove; the first excitation coil 16 is symmetrical to the second excitation coil 17. When the T-like moving block slides to the annular groove, a third magnetorheological fluid damping gap is formed between the narrow end of the T-like moving block and the inner wall of the annular groove.
The first magnetorheological fluid damping gap, the second magnetorheological fluid damping gap and the third magnetorheological fluid damping gap are communicated, and the third magnetorheological fluid damping gap is excessively formed in the second magnetorheological fluid damping gap.
Claims (8)
1. The rotary magneto-rheological damper is characterized in that: comprises a first rotating shaft, a second rotating shaft, a third rotating shaft and a damping device fixed on the third rotating shaft; the first rotating shaft is coaxial with the third rotating shaft, and the tail end of the first rotating shaft is not contacted with the head end of the third rotating shaft; the second rotating shaft is parallel to the first rotating shaft; the second rotating shaft and the third rotating shaft are parallel; a first gear is fixed on the first rotating shaft, a second gear and a third gear are fixed on the second rotating shaft, and a fourth gear is fixed on the third rotating shaft; the first gear is externally meshed with the second gear, and the third gear is externally meshed with the fourth gear; the third gear is positioned below the second gear; the damping device is positioned below the fourth gear;
the damping device comprises an upper cover, a lower cover, a piston and a sleeve; the third rotating shaft penetrates through the upper cover, the lower cover and the piston, and the upper cover and the lower cover are coaxial with the third rotating shaft; the third rotating shaft is connected with the upper cover and the lower cover through bearings; the piston is positioned between the upper cover and the lower cover and is coaxial with the third rotating shaft; a sleeve is arranged outside the piston; gaps among the piston, the upper cover and the lower cover form a first magnetorheological fluid damping gap;
a convex cavity is formed in the piston, and a spring, a first stop block, a second stop block and a T-shaped moving block are fixed in the convex cavity; one end of the spring is connected with the inner wall of the convex cavity, and the other end of the spring is connected with the T-shaped moving block; the end of the wide part of the T-like moving block is in contact with the upper wall and the lower wall of the convex cavity, and the distance between the narrow part of the T-like moving block and the inner wall of the convex cavity is a second magnetorheological fluid damping gap; the T-like moving block slides relatively along the inner wall of the convex cavity, the second blocking block is arranged at the opening of the convex cavity, and magnetorheological fluid is filled in the convex cavity;
the sleeve is provided with an annular groove, and the axial height of the annular groove is equal to that of the convex cavity; the upper part of the annular groove is provided with a first excitation coil, the lower part of the annular groove is provided with a second excitation coil, and the outer side of the annular groove covers a third excitation coil; when the T-like moving block slides to the annular groove, a third magnetorheological fluid damping gap is formed between the narrow end of the T-like moving block and the inner wall of the annular groove.
2. The rotary magnetorheological damper according to claim 1, wherein the piston is internally provided with four lug cavities which are evenly distributed at 90-degree intervals along the axial direction.
3. The rotary magnetorheological damper of claim 1, wherein the spring is initially in an extended state having a tensile force.
4. The rotary magnetorheological damper according to claim 1, wherein the T-shaped moving block initially receives the tensile force of the spring, and the lower end of the T-shaped moving block is stopped by the first stop block and is fixedly retained in the convex cavity.
5. The rotary magnetorheological damper of claim 1, wherein the first stop block is square.
6. The rotary magnetorheological damper of claim 1, wherein the second stop block is square and has a protruding end.
7. The rotary magnetorheological damper according to claim 1, wherein the first magnetorheological fluid damping gap, the second magnetorheological fluid damping gap, and the third magnetorheological fluid damping gap are in communication; and the second magnetorheological damping gap is transited to form a third magnetorheological damping gap.
8. The rotary magnetorheological damper of claim 1, wherein the first and second field coils are symmetrical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910052891.8A CN109723749B (en) | 2019-01-21 | 2019-01-21 | Rotary magnetorheological damper |
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| CN201910052891.8A CN109723749B (en) | 2019-01-21 | 2019-01-21 | Rotary magnetorheological damper |
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| CN109723749A CN109723749A (en) | 2019-05-07 |
| CN109723749B true CN109723749B (en) | 2020-05-29 |
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| CN110886806A (en) * | 2019-12-04 | 2020-03-17 | 安徽江淮汽车集团股份有限公司 | Rotary magnetorheological damper |
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| KR100830646B1 (en) * | 2006-08-31 | 2008-05-20 | 발레오전장시스템스코리아 주식회사 | Starter Stopping Noise Reduction with the modification of segments |
| CN202424445U (en) * | 2011-10-17 | 2012-09-05 | 上海电机学院 | Switch reluctance motor with parallel structure |
| CN103925332B (en) * | 2014-04-25 | 2015-12-09 | 吉林大华机械制造有限公司 | The centrifugal spin friction damper of a kind of self-regulating |
| KR20160064625A (en) * | 2014-11-28 | 2016-06-08 | 영산대학교산학협력단 | Light weight Flywheel of Car engine |
| CN105952975B (en) * | 2016-07-10 | 2018-01-19 | 北京工业大学 | A kind of magneto-rheological vibration damping pipe clamp |
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