CN113090703A - Automobile collision magnetorheological grease buffer device - Google Patents
Automobile collision magnetorheological grease buffer device Download PDFInfo
- Publication number
- CN113090703A CN113090703A CN202110229396.7A CN202110229396A CN113090703A CN 113090703 A CN113090703 A CN 113090703A CN 202110229396 A CN202110229396 A CN 202110229396A CN 113090703 A CN113090703 A CN 113090703A
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- Prior art keywords
- piston
- magnetic conductive
- conductive ring
- ring
- magnetorheological grease
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/023—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using fluid means
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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
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/03—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using magnetic or electromagnetic means
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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
Abstract
The invention discloses a magnetorheological grease buffer device for automobile collision, which comprises a buffer platform, a piston rod, a spring, a cylinder, a piston, an external magnetic conductive ring and an internal magnetic conductive ring, wherein the piston rod is fixedly connected with the buffer platform; one end of the piston rod is connected with the buffering platform, the other end of the piston rod is connected with the piston, and a spring is arranged between the piston rod and the cylinder; the piston is internally provided with a mounting hole, a through-flow rod is arranged in the mounting hole, and a hole is formed in the through-flow rod; an inner magnetic conduction ring and an outer magnetic conduction ring are sequentially sleeved on the outer side of the piston; a magneto-rheological damping channel is formed between the internal magnetic conduction ring and the external magnetic conduction ring; the cylinder is filled with magnetorheological grease. The invention absorbs the energy generated by collision through two stages; the peak value of the impact force can be effectively reduced in time by utilizing the through hole in the piston in the first stage, and the damping force is generated by thickening under the action of the magnetic field by utilizing the mechanism characteristic of the magnetorheological grease in the second stage, so that the residual impact force is relieved.
Description
Technical Field
The invention relates to the technical field of buffer devices, in particular to a magnetorheological grease buffer device for automobile collision.
Background
When the automobile collides in the driving process, the energy is absorbed mainly by the deformation of the automobile body, so that the injury to personnel on the automobile is reduced. The main features for a car crash are as follows:
(1) when the automobile collides, the instantaneous energy is large, the mass of the automobile is very large, and the mass of the automobile body of the car is about 500-2500 kg. In addition, in the event of a serious collision damage, the collision velocity is also relatively high, and the collision energy in the automobile collision is very high due to the two factors.
(2) The collision duration is short, the collision process of the automobile refers to the time history from the moment of collision and contact of the automobile to the moment of separation and contact of the automobile, the duration of the process is extremely short, and the time for the automobile magnetorheological grease buffer device to play a buffering role is only dozens of milliseconds.
(3) A relatively large displacement is required, and energy is absorbed to reduce energy transmitted to a driver mainly by deformation on a vehicle body in the event of collision. A relatively large displacement is required to absorb most of the collision energy of the vehicle.
In order to improve the safety performance of automobiles, reducing casualties in collision accidents is a key problem to be solved. With the progress of research, various energy absorption modes are presented, such as: progressive crushing, hydraulic damping, friction, air bag, etc.; the cushioning devices created in these energy-absorbing ways play an important role in the event of a collision. But the damping of these energy absorbing elements cannot be actively adjusted.
With the improvement of the safety standard of the automobile and the appearance of the magnetorheological material, experts and scholars can see a new direction of automobile collision energy absorption. The rheological property of the damping material is changed along with the change of the magnetic field, the damping material is an intelligent material which can be rapidly, continuously and reversibly changed, and the damping device designed by the material has the advantages of adjustable damping force, high-efficiency energy absorption and the like.
The choice of materials in the conventional magnetorheological buffer devices generally applies magnetorheological fluid, and the materials have certain defects, such as: easy sedimentation, poor stability, small adjustable range of damping force and the like. The magnetorheological grease has the characteristics of difficult sedimentation, good stability and the like, can well make up for the defects of the magnetorheological fluid, and keeps the advantages of quick response and large change of viscosity and shear yield stress of the magnetorheological fluid. However, the magnetorheological grease material is viscous and has poor fluidity compared with the magnetorheological grease material, so that the problem needs to be solved urgently in the automobile collision process.
Disclosure of Invention
Based on the problems, the invention provides a magnetorheological grease buffer device which absorbs energy generated by collision through two stages; the peak value of the impact force can be effectively reduced in time by utilizing the through hole in the piston in the first stage, and the damping force is generated by thickening under the action of the magnetic field by utilizing the mechanism characteristic of the magnetorheological grease in the second stage, so that the residual impact force is relieved. Meanwhile, in order to increase the utilization rate of the magnetic field, a mode of alternately connecting the magnetic conductive rings and the non-magnetic conductive rings is designed, so that the magnetic field generated by the excitation coil vertically passes through the damping channel for many times, the utilization rate of the magnetic field is increased, and the output damping force of the magnetorheological grease is also increased.
The adopted technical scheme is as follows: a magnetorheological grease buffer device for automobile collision comprises a buffer platform, a piston rod, a spring, a cylinder, a piston, an external magnetic conduction ring and an internal magnetic conduction ring;
one side of the piston rod is provided with a wire hole; one end of the piston is connected with the buffering platform through threads, and the other end of the piston is connected with the piston;
the piston is positioned in the cylinder body; the middle part is provided with an annular groove, an excitation coil is wound in the annular groove, and one end of the excitation coil is led out from a wire hole of the piston rod; two through holes are also formed in the piston, and through-flow rods are arranged in the through holes;
the through-flow rod is hollow, and one side of the through-flow rod is provided with a hole; one end of the piston is fixed at the bottom of the cylinder body through threads, and the other end of the piston is positioned in a through hole in the piston;
the cylinder is filled with magnetorheological grease, and an upper end cover is arranged at the upper part of the cylinder for sealing; a spring is arranged between the upper end cover and the buffering platform; an external magnetic conduction ring and an internal magnetic conduction ring are arranged in the cylinder; the inner magnetic conductive ring and the outer magnetic conductive ring are sequentially sleeved on the outer side of the piston, a gap is formed between the inner magnetic conductive ring and the outer magnetic conductive ring, and the gap is a magneto-rheological damping channel;
the internal magnetic conduction ring is sleeved on the outer side of the piston and is tightly attached to the outer side of the piston; the magnetic conductive ring and the non-magnetic conductive ring are sequentially and alternately connected;
the outer magnetic conduction ring is positioned on the outer side of the inner magnetic conduction ring and is tightly attached to the inner wall of the cylinder; the magnetic conductive ring and the non-magnetic conductive ring are sequentially and alternately connected; (ii) a
Four mounting holes are uniformly formed in the magnetic conductive ring; the non-magnetic conductive ring is provided with four shafts which are matched with the mounting holes to fix the magnetic conductive ring and the non-magnetic conductive ring.
Furthermore, the hole on the through-flow rod is positioned in the middle of the through-flow rod.
Further, the height of the annular groove is at least half of the height of the piston.
Further, the heights of the inner magnetic conduction ring and the outer magnetic conduction ring are respectively the same as the height of the piston.
Furthermore, the internal magnetic conduction ring is formed by sequentially and alternately matching a first magnetic conduction ring, a first non-magnetic conduction ring, a second non-magnetic conduction ring and a third magnetic conduction ring.
Furthermore, the external magnetic conduction ring is formed by sequentially and alternately matching a fourth magnetic conduction ring, a fourth non-magnetic conduction ring and a fifth magnetic conduction ring.
The novel automobile collision magnetorheological grease buffer device disclosed by the invention has the advantages that two-stage buffering is designed, collision energy is absorbed, and meanwhile, a multi-stage channel is arranged in the cylinder body, so that the flowability of magnetorheological grease is relieved.
The buffering process can be divided into two stages, the first stage, when the car bumps, the impact force rises sharply, and on the impact force very first time transmitted the impact platform, the impact platform passed through threaded connection with the piston rod, and the spring is located between impact platform and the upper end cover, and the impact platform drives the piston rod and down moves, at the compression spring of removal in-process. The piston rod can drive the piston to move downwards at the same time, before the piston moves, the hole in the through-flow rod is positioned below the piston and is not positioned in the piston, and because the cylinder body is filled with the magnetorheological grease, the hole in the through-flow rod flows the magnetorheological grease of the zero-crossing magnetic field under the compression action during collision, the flow of the magnetorheological grease can be increased, and the peak impact force can be relieved after the impact force rises sharply through the through-flow hole and the spring.
In the second stage, along with the downward movement of the piston, the hole on the through-flow rod is positioned in the piston, and the magnetorheological grease does not pass through the through-flow hole at the moment, so that the damping force is completely provided by the magnetorheological grease in the damping channel. The piston is wound with a magnet exciting coil, and a lead of the magnet exciting coil can be led out through a wire hole in the piston rod. The outer side of the piston is sleeved with an internal magnetic conduction ring, the magnetic conduction ring is used for guiding a magnetic field generated by the excitation coil, and the non-magnetic conduction ring is used for isolating the magnetic field so that the magnetic field can circulate according to design requirements. The holes on the magnetic conductive rings are connected with the shafts on the non-magnetic conductive rings, and the holes and the shafts are alternately connected to form the internal magnetic conductive rings. The outer magnetic conductive ring is positioned on the inner wall of the cylinder body, and a gap between the outer magnetic conductive ring and the inner magnetic conductive ring is a damping channel. The magnetorheological grease passes through the annular damping channel under the action of pressure, and a magnetic field generated by the excitation coil effectively passes through the annular damping channel for multiple times under the action of alternate arrangement of the magnetic conduction rings and the non-magnetic conduction rings, so that the magnetorheological grease in the damping channel becomes viscous, and the damping force is increased. The magnetorheological grease buffer device is externally provided with a sensor and a controller, the sensor can measure the force generated by collision, the controller outputs corresponding current to the excitation coil according to the force, and after the collision is finished, the controller stops energizing the excitation coil. The magnetorheological grease becomes diluted again after the magnetic field is lost.
The invention can be repeatedly used for many times. The multi-level channel is adopted, so that the peak value of the impact force can be effectively reduced, and the mechanism characteristic of the magnetorheological grease is utilized, so that the magnetorheological grease becomes viscous under the action of a magnetic field to generate a damping force, and further the residual impact force is relieved.
Drawings
FIG. 1 is a schematic structural view of a magnetorheological grease buffer device for vehicle collision according to the invention;
FIG. 2 is an exploded view of an automotive crash magnetorheological grease cushioning device in accordance with the present invention;
FIG. 3 is an exploded view of the inner magnetic ring, the outer magnetic ring and the piston of the magnetorheological grease buffer device for vehicle collision according to 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 3, an automobile collision magnetorheological grease buffer device comprises a buffer platform 1, a piston rod 2, a spring 3, a cylinder 4, a piston 5, an external magnetic conductive ring 7 and an internal magnetic conductive ring 6.
One side of the piston rod 2 is provided with a wire hole 21; one end of the piston rod 2 is connected with the buffering platform 1 through threads, and the other end of the piston rod is connected with the piston 5;
the piston 5 is positioned in the cylinder 4; the middle part is provided with an annular groove, and the height of the annular groove is at least half of the height of the piston 4; an excitation coil 9 is wound in the annular groove, and one end of the excitation coil 9 is led out from a wire hole 21 of the piston rod 2; two through holes 51 are also formed in the piston 5, and through-flow rods 8 are arranged in the through holes;
the through-flow rod 8 is hollow, and the middle of one side is provided with a hole 81; one end of the piston is fixed at the bottom of the cylinder 4 through threads, and the other end of the piston is positioned in the piston; the opening 81 is located below the piston 5 in the normal state.
The space between the cylinder 4 and the piston 5 is filled with magnetorheological grease, and the upper part of the space is provided with an upper end cover 41 for sealing; a spring 3 is arranged between the upper end cover 41 and the buffering platform 1; an external magnetic conduction ring 7 and an internal magnetic conduction ring 6 are arranged in the cylinder 4; the inner magnetic conductive ring 6 and the outer magnetic conductive ring 7 are sequentially sleeved on the outer side of the piston 5, a gap 10 is formed between the inner magnetic conductive ring 6 and the outer magnetic conductive ring 7, and the gap 10 is a magneto-rheological damping channel; the height of the piston 5, the inner magnetic conductive ring 6 and the outer magnetic conductive ring 7 is the same. The inner magnetic conductive ring 6 moves up and down with the piston 5.
The internal magnetic conduction ring 6 is sleeved outside the piston 5 and clings to the outside of the piston; the internal magnetic conductive ring 6 is formed by sequentially and alternately matching a first magnetic conductive ring 61, a first non-magnetic conductive ring 62, a second magnetic conductive ring 63, a second non-magnetic conductive ring 64 and a third magnetic conductive ring 65.
The external magnetic conduction ring 7 is positioned on the outer side of the internal magnetic conduction ring 6 and is tightly attached to the inner wall of the cylinder 4; the external magnetic conductive rings are formed by sequentially and alternately matching 7 fourth magnetic conductive rings 71, fourth non-magnetic conductive rings 72 and fifth magnetic conductive rings 73.
Four mounting holes 11 are uniformly formed in each magnetic conductive ring; four shafts 12 are arranged on the non-magnetic conductive ring, and the shafts 12 are matched with the mounting holes 11 to fix the magnetic conductive ring and the non-magnetic conductive ring.
Claims (6)
1. The automobile collision magnetorheological grease buffer device is characterized in that: the device comprises a buffer platform, a piston rod, a spring, a cylinder, a piston, an external magnetic conduction ring and an internal magnetic conduction ring;
one side of the piston rod is provided with a wire hole; one end of the piston is connected with the buffering platform through threads, and the other end of the piston is connected with the piston;
the piston is positioned in the cylinder; the middle part is provided with an annular groove, an excitation coil is wound in the annular groove, and one end of the excitation coil is led out from a wire hole of the piston rod; two through holes are also formed in the piston, and through-flow rods are arranged in the through holes;
the through-flow rod is hollow, and one side of the through-flow rod is provided with a hole; one end of the piston rod is fixed at the bottom of the cylinder body through threads, and the other end of the piston rod is positioned in the piston;
the inner part of the cylinder body is filled with magnetorheological grease, and the upper part of the cylinder body is provided with an upper end cover for sealing; a spring is arranged between the upper end cover and the buffering platform; an external magnetic conduction ring and an internal magnetic conduction ring are arranged in the cylinder; the inner magnetic conductive ring and the outer magnetic conductive ring are sequentially sleeved on the outer side of the piston, a gap is formed between the inner magnetic conductive ring and the outer magnetic conductive ring, and the gap is a magneto-rheological damping channel;
the internal magnetic conduction ring is sleeved on the outer side of the piston and is tightly attached to the outer side of the piston; the magnetic conductive ring and the non-magnetic conductive ring are sequentially and alternately connected;
the outer magnetic conduction ring is positioned on the outer side of the inner magnetic conduction ring and is tightly attached to the inner wall of the cylinder; the magnetic conductive ring and the non-magnetic conductive ring are sequentially and alternately connected;
four mounting holes are uniformly formed in the magnetic conductive ring; the non-magnetic conductive ring is provided with four shafts which are matched with the mounting holes to fix the magnetic conductive ring and the non-magnetic conductive ring.
2. The magnetorheological grease buffer device for the collision of the automobile according to claim 1, wherein the hole on the through-flow rod is positioned in the middle of the through-flow rod.
3. The magnetorheological grease cushioning device for vehicle collision according to claim 1, wherein the annular groove has a height of at least one-half of the height of the piston.
4. The magnetorheological grease buffer device for automobile collision according to claim 1, wherein the heights of the inner magnetic conductive ring and the outer magnetic conductive ring are respectively the same as the height of the piston.
5. The magnetorheological grease buffer device for automobile collision according to claim 1, wherein the internal magnetic conductive rings are formed by sequentially and alternately matching a first magnetic conductive ring, a first non-magnetic conductive ring, a second non-magnetic conductive ring and a third magnetic conductive ring.
6. The magnetorheological grease buffer device for automobile collision according to claim 1, wherein the outer magnetic conductive ring is formed by alternately matching a fourth magnetic conductive ring, a third magnetic conductive ring and a fifth magnetic conductive ring in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110229396.7A CN113090703A (en) | 2021-03-02 | 2021-03-02 | Automobile collision magnetorheological grease buffer device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110229396.7A CN113090703A (en) | 2021-03-02 | 2021-03-02 | Automobile collision magnetorheological grease buffer device |
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| Publication Number | Publication Date |
|---|---|
| CN113090703A true CN113090703A (en) | 2021-07-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110229396.7A Pending CN113090703A (en) | 2021-03-02 | 2021-03-02 | Automobile collision magnetorheological grease buffer device |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3040907A (en) * | 1958-06-09 | 1962-06-26 | Construction Du Nord De La Fra | Hydraulic shock-absorber |
| PL341617A1 (en) * | 1999-07-23 | 2001-01-29 | Elze Waggonbau Gmbh & Co Kg | Long-stroke shock absorber |
| CN102359537A (en) * | 2011-09-01 | 2012-02-22 | 谭晓婧 | Single-rod magneto-rheological grease damper |
| CN102661353A (en) * | 2012-05-30 | 2012-09-12 | 石家庄铁道大学 | Magnetorheological damper with convenience in assembly and disassembly of coil component |
| US20150247548A1 (en) * | 2012-09-04 | 2015-09-03 | Inventus Engineering Gmbh | Magnetorheological transmission apparatus |
| CN105065559A (en) * | 2015-07-22 | 2015-11-18 | 石家庄铁道大学 | Parallel-connection multi-channel magnetorheological damper |
| CN105156560A (en) * | 2015-07-20 | 2015-12-16 | 常州大学 | Double-rod variable-orifice passive double-control variable-damping magnetorheological damper |
| CN105840718A (en) * | 2016-05-16 | 2016-08-10 | 中国人民解放军装甲兵工程学院 | Rapid optimal design method for magnetorheological damper |
-
2021
- 2021-03-02 CN CN202110229396.7A patent/CN113090703A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3040907A (en) * | 1958-06-09 | 1962-06-26 | Construction Du Nord De La Fra | Hydraulic shock-absorber |
| PL341617A1 (en) * | 1999-07-23 | 2001-01-29 | Elze Waggonbau Gmbh & Co Kg | Long-stroke shock absorber |
| CN102359537A (en) * | 2011-09-01 | 2012-02-22 | 谭晓婧 | Single-rod magneto-rheological grease damper |
| CN102661353A (en) * | 2012-05-30 | 2012-09-12 | 石家庄铁道大学 | Magnetorheological damper with convenience in assembly and disassembly of coil component |
| US20150247548A1 (en) * | 2012-09-04 | 2015-09-03 | Inventus Engineering Gmbh | Magnetorheological transmission apparatus |
| CN105156560A (en) * | 2015-07-20 | 2015-12-16 | 常州大学 | Double-rod variable-orifice passive double-control variable-damping magnetorheological damper |
| CN105065559A (en) * | 2015-07-22 | 2015-11-18 | 石家庄铁道大学 | Parallel-connection multi-channel magnetorheological damper |
| CN105840718A (en) * | 2016-05-16 | 2016-08-10 | 中国人民解放军装甲兵工程学院 | Rapid optimal design method for magnetorheological damper |
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