CN112744288B - Electric power steering system based on multi-disc type magnetorheological fluid clutch - Google Patents
Electric power steering system based on multi-disc type magnetorheological fluid clutch Download PDFInfo
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- CN112744288B CN112744288B CN202110106215.1A CN202110106215A CN112744288B CN 112744288 B CN112744288 B CN 112744288B CN 202110106215 A CN202110106215 A CN 202110106215A CN 112744288 B CN112744288 B CN 112744288B
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- disc
- magnetorheological fluid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/043—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by clutch means between driving element, e.g. motor, and driven element, e.g. steering column or steering gear
Abstract
The invention relates to an electric power steering system based on a multi-disc magnetorheological fluid clutch, which comprises a steering wheel, a torque sensor, a speed reducing mechanism, a steering gear, a connecting rod, a steering rack, an electric motor, a multi-disc magnetorheological fluid clutch device, an Electronic Control Unit (ECU) and the like. Compared with the prior art, the invention has the advantages that under the influence of different magnetic field strengths, the change range of the bearing transmission torque is larger through the multi-disc magnetorheological fluid clutch, and the multi-disc magnetorheological fluid clutch can be applied to various vehicle-mounted tools.
Description
Technical Field
The invention relates to the field of automobile steering system design, in particular to an electric power steering system based on a multi-disc magnetorheological fluid clutch.
Background
Currently, Electronic Power Steering (EPS) can be classified into four types, including a Steering column Power electronic Steering machine, a gear Power electronic Steering machine, a double pinion type electronic Power Steering machine, and a rack Power electronic Steering machine, according to a Power Steering mode. From compact cars, medium-class cars to luxury cars and van-type cars, the different classes of cars may be selected from one of them according to the installation space of the vehicle, the energy source of the vehicle and the rack assist force required. However, the steering systems are limited by the structural characteristics of the steering systems, the applicable vehicle type range is narrow, part of the power-assisted systems occupies a large space, and the situation that the moment control is unstable easily occurs.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an electric power steering system based on a multi-disc magnetorheological fluid clutch.
The purpose of the invention can be realized by the following technical scheme:
the electric power-assisted steering system comprises a steering system and an electric power-assisted system, wherein the steering system comprises a steering wheel, a steering output shaft, a steering mechanism and wheels, the steering mechanism is connected with the steering output shaft, the electric power-assisted system comprises an electronic control unit, a motor and a speed reducing mechanism, the electric power-assisted system further comprises a multi-disc magnetorheological fluid clutch, a torque sensor is arranged on the steering output shaft of the steering wheel, the torque sensor is connected with the electronic control unit, the electronic control unit controls the output torque of the motor through a current signal, the output shaft of the motor is connected with an input shaft of the multi-disc magnetorheological fluid clutch, and the speed reducing mechanism is directly connected with the steering mechanism.
The electronic control unit is combined with a torque signal of the torque sensor and a vehicle speed signal to control the motor to deliver the assistance torque of a corresponding degree, and the multi-disc magnetorheological fluid clutch is used as an intermediate force transmission device to transmit the assistance torque delivered by the motor to the steering mechanism through the speed reducing mechanism.
The multi-disc magnetorheological fluid clutch comprises a driving shaft connected with the motor, a supporting seat of a hollow symmetrical shell structure, an installation shaft hole arranged in the center of the supporting seat and installation parts symmetrically arranged on two sides of the installation shaft hole, wherein the supporting seat is connected with the driving shaft into a whole, the installation shaft hole is used for connecting an output shaft of the motor and an installation driven shaft, the driven shaft extends out of the supporting seat and then is connected with a speed reducing mechanism, and a multi-disc structure, a transmission medium magnetorheological fluid and a coil used for controlling the magnetorheological fluid to be in a shape change are arranged in the installation parts.
The multi-disc structure comprises driving discs, driven discs and driving cylinders, wherein the driving discs, the driven discs and the driving cylinders are arranged in a staggered contact mode, the driving cylinders are symmetrically fixed inside the supporting seat, the driving discs are fixed on the driving cylinders through fixing pins, and the driven discs are fixed on the driven shafts through spline hubs. And the space between the driving disc and the driven disc is filled with magnetorheological fluid, and the form conversion of the magnetorheological fluid is controlled by passing different currents through the coils to generate magnetic fields with different strengths.
Furthermore, the multi-disc structure comprises three driving discs and two driven discs, wherein the two driven discs are symmetrically arranged on two sides of one driving disc, and the other two driving discs are symmetrically arranged on two sides of the two driven discs respectively.
Furthermore, the driven shaft is fixed in the mounting shaft hole of the supporting seat through a rolling bearing and an oil seal, the oil seal is of a concentric ring structure with the same diameter as the mounting shaft hole, the axis of the oil seal coincides with the axis of the mounting shaft hole and is fixed on the inner wall of the supporting seat, and the two oil seals are in sliding sealing contact with the two driving discs symmetrically arranged on the two sides of the two driven discs respectively.
Further, the steering mechanism comprises a steering gear and a rack connected with the steering gear, and two sides of the rack are respectively connected with wheels. The lower end of the steering output shaft is connected with a steering gear through a connecting rod.
Furthermore, the side wall of the supporting seat is provided with heat dissipation holes.
Compared with the prior art, the electric power steering system based on the multi-disc magnetorheological fluid clutch at least has the following beneficial effects:
firstly, in the electric power-assisted part of the system, the speed reducing mechanism is directly connected with the steering gear, and the power-assisted provided by the motor is directly transmitted to the steering gear.
The multi-disc type magnetorheological fluid clutch is internally provided with a multi-disc structure, namely three driving discs are in staggered contact with two driven discs, so that the contact area of the driving discs and the driven discs is increased compared with a double-disc type clutch, and the torque which can be transmitted by the magnetorheological fluid clutch is larger; in addition, because the multi-disc clutch can transmit larger torque, compared with a double-disc clutch, the design diameter of the transmission disc can be effectively reduced, and finally the design size of the clutch is reduced on the whole, so that the space of the steering power-assisted system is saved.
Under the condition of no magnetic field, the magnetorheological fluid has the characteristic of interconversion between the quasi-solid and the Newtonian fluid, and the response time is millisecond, so that the electric power steering system can realize the electric power assistance under various conditions; in addition, the magnetorheological fluid has stronger torque bearing capacity after class solidification, so that the designed electric power steering system can be suitable for more types of vehicle-mounted tools, electric power assistance in a wider range is realized, the industrial production cost is saved, and the production efficiency is improved.
And the multi-disc magnetorheological fluid clutch is easy to disassemble, and a magnetorheological fluid medium can be replaced in time, so that the service life of the clutch is longer, and the service life of a system is prolonged.
Fifthly, the magnetorheological fluid is similar to Newton fluid in a field-free state, so that the electric power steering can play a certain damping role; the magnetorheological fluid is converted from Newton-like fluid into solid-like fluid in the presence of a field, still has certain damping characteristic at the moment, and still can play a role in reducing buffer. Such characteristics are beneficial to improving the running stability of the electric power steering system and providing a certain steering comfort and safety for a driver.
Drawings
FIG. 1 is a schematic structural diagram of an electric power steering system based on a multi-disc magnetorheological fluid clutch according to an embodiment;
FIG. 2 is a schematic diagram of an internal plan view of an embodiment of a multiple disc magnetorheological fluid clutch;
FIG. 3 is a schematic plan view showing the installation of the oil seal in the embodiment;
FIG. 4 is a schematic plan view of a force transfer mechanism of the electric assist portion of the embodiment;
the reference numbers in the figures indicate:
1. the device comprises a steering wheel, 2, a torque sensor, 3, a steering gear, 4, a rack, 5, wheels, 6, a speed reducing mechanism, 7, a multi-disc magnetorheological fluid clutch, 8, a motor, 9, an electronic control unit, 10 and a steering output shaft; the device comprises a driving disc 11, a driven disc 12, a driven disc 13, a driven shaft 14, an oil seal 15, a rolling bearing 16, a driving cylinder 17, a supporting seat 18, a coil 19, a heat dissipation hole 20, a driving shaft 21 and a connecting sleeve.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
Examples
As shown in FIG. 1, the invention relates to an electric power steering system based on a multi-disc magnetorheological fluid clutch, which comprises a steering wheel 1, a torque sensor 2, a steering gear 3, a rack 4, wheels 5, a speed reducing mechanism 6, a multi-disc magnetorheological fluid clutch 7, an electric motor 8 and an electronic control unit 9.
A steering output shaft 10 is connected to the lower middle part of the steering wheel 1, a torque sensor 2 is arranged on the steering output shaft 10, and the torque sensor 2 is connected with an electronic control unit 9. The lower end of the steering output shaft 10 is connected with a steering gear 3 through a connecting rod, the steering gear 3 is connected with a rack 4, and two sides of the rack 4 are respectively connected with wheels 5. The electronic control unit 9 is sequentially connected with the motor 8, the multi-disc magnetorheological fluid clutch 7 and the speed reducing mechanism 6, and the speed reducing mechanism 6 is connected with the rack 4.
A driver transmits torque force to a steering gear 3 through a connecting rod through a steering wheel 1, the steering gear 3 drives a rack 4 to move, and therefore wheels 5 are steered (a torque sensor 2 transmits a torque force signal to an electronic control unit 9); in the electric power assisting part, the connection sequence is motor 8 → multi-disc magnetorheological fluid clutch 7 → speed reducing mechanism 6 → rack 4, the electronic control unit 9 outputs different currents according to signals such as torque force, vehicle speed, load and the like, so as to control the motor 8 to output appropriate power assisting torque, and the power assisting torque is transmitted to the rack 4 through the multi-disc magnetorheological fluid clutch 7 and the speed reducing mechanism 6 in sequence, so as to realize the power steering function.
As shown in fig. 2, the multi-disc magnetorheological fluid clutch 7 includes a driving shaft 20, a support seat 17, and a driving disc 11, a driven disc 12, a driven shaft 13, an oil seal 14, a rolling bearing 15, a driving cylinder 16, a coil 18 and a heat dissipation hole 19 which are installed inside the support seat 17. The supporting seat 17 is a hollow symmetrical shell structure, and the supporting seat 17 is connected with the driving shaft 20 of the multi-disc magnetorheological fluid clutch 7 into a whole. The geometric center of the support seat 17 is provided with a shaft hole which is through from front to back, and one end of the shaft hole is used for installing the driven shaft 13. The driven shaft 13 is fixed in the shaft hole of the support base 17 through the contact rolling bearing 15 and the oil seal 14. In this embodiment, as a preferable scheme, three driving disks 11 and two driven disks 12 are arranged in the supporting seat 17, the three driving disks 11 are in staggered contact with the two driven disks 12, that is, one driving disk 11 is arranged at a middle position, the two driven disks 12 are symmetrically arranged at two sides of the driving disk 11 at the middle position, and the other two driving disks 11 are respectively symmetrically arranged at two sides of the two driven disks 12. The driving disk 11 is fixed to the driving cylinder 16 by a fixing pin, and the driven disk 12 is fixed to the driven shaft 13 by a spline hub. A gap exists between the driving disc 11 and the driven disc 12, and a sealed space is formed by the driving disc, the driven disc and the oil seal 14, so that magnetorheological fluid can be stored.
In the present embodiment, the driving disk 11 and the driven disk 12 are both of a disk structure. The center of each driving disk 11 is provided with a round hole for sleeving the driven shaft 13. The oil seals 14 are concentric circular ring structures with the same diameter as the shaft hole, the axes of the oil seals coincide with the axis of the shaft hole and are fixed on the inner wall of the supporting seat 17 through fixing pins, and the two oil seals 14 are respectively in sliding sealing contact with the two driving discs 11 on the outermost side to play a role in sealing the magnetorheological fluid and fixing the driven shaft 13, and the specific figure is 3. The driving cylinder 16 is mounted inside the support 17 while leaving enough space between the driving cylinder 16 and the inner wall of the support 17 for mounting the coil 18.
The driving shaft 20 of the multi-disc magnetorheological fluid clutch 7 is used for connecting an output shaft of the motor 8 and is called as an assistance torque input end. One end of the driven shaft 13 is arranged in the supporting seat 17, and the other end of the driven shaft extends out of the shaft hole of the supporting seat 17 and is used for connecting the speed reducing mechanism 6 and is called an output end of the boosting torque. The driven shaft 13 is fixed in the mounting shaft hole of the support base 17 through a contact rolling bearing 15 and an oil seal 14. The driving disk 11 is fixed to the driving cylinder 16 by a fixing pin, and the driven disk 12 is fixed to the driven shaft 13 by a spline hub. A gap exists between the driving disc 11 and the driven disc 12, and a sealed space is formed by the driving disc, the driven disc and the oil seal 14, so that magnetorheological fluid can be stored.
The magnetorheological fluid is a special suspension material, can be converted into a solid with certain viscoelasticity from a Newtonian-like fluid when the magnetorheological fluid is in a magnetic field state, and the curing degree of the magnetorheological fluid is gradually improved along with the increase of the magnetic field strength. Magnetorheological fluid is filled between the driving disk 11 and the driven disk 12 as clutch transmission fluid, when current is conducted to the coil 18, a magnetic field can be generated in a sealed space where the magnetorheological fluid is located, the magnetorheological fluid is changed into a similar solid under the influence of the magnetic field, and therefore the purpose that the driving disk 11 and the driven disk 12 are connected through intermediate medium magnetorheological fluid type curing is achieved; when the current in the coil 18 is increased, the magnetorheological fluid is influenced by the magnetic field with higher strength to realize higher-degree class solidification, and at the moment, if the magnetorheological fluid is made to flow, larger relative moment, namely larger shearing force, is needed between the driving disc 11 and the driven disc 12.
Based on the principle, when the electric power-assisted part needs to provide larger power assistance for the steering part, only corresponding current needs to be increased within a system setting range, so that the motor 8 outputs larger power assistance torque, and meanwhile, current with corresponding magnitude needs to be supplied to the coil 18 in the multi-disc clutch 7, so that magnetorheological fluid in a sealed space of the clutch is solidified to bear the power assistance torque transmitted by the motor, and finally, the electric power assistance transmission required by the steering system is realized. Because the output shaft of the motor 8 is connected with the boosting torque input end of the multi-disc magnetorheological fluid clutch 7 through the connecting sleeve 21, namely the whole boosting torque transmission process is as follows: the motor 8 transmits the assisting torque to the driving disc 11 through the assisting torque input end of the multi-disc magnetorheological fluid clutch 7, then the driving disc 11 transmits the assisting torque to the driven disc 12 through the medium magnetorheological fluid, then the driven disc 12 transmits the assisting torque to the speed reducing structure 6 through the assisting torque output end, and finally the assisting torque is transmitted to the steering rack 4, so that the electric assisting transmission in the whole process is realized, and particularly, the electric assisting transmission is shown in fig. 4.
The multi-disc magnetorheological fluid clutch 7 can generate a large amount of heat after long-time operation, so the heat dissipation holes 19 are formed in the side wall of the shell.
In the electric power-assisted part of the system, the speed reducing mechanism is directly connected with the steering gear, and the power-assisted provided by the motor is directly transmitted to the steering gear. The multi-disc type magnetorheological fluid clutch is internally provided with a multi-disc structure, namely three driving discs are in staggered contact with two driven discs, so that the contact area between the driving discs and the driven discs is increased compared with a double-disc type clutch, and the torque which can be transmitted by the magnetorheological fluid clutch is larger; in addition, because the multi-disc clutch can transmit larger torque, compared with a double-disc clutch, the design diameter of the transmission disc can be effectively reduced, and finally the design size of the clutch is reduced on the whole, so that the space of the steering power-assisted system is saved.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and those skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. An electric power steering system based on a multi-disc magnetorheological fluid clutch comprises a steering system and an electric power steering system, wherein the steering system comprises a steering wheel (1), a steering output shaft (10), a steering mechanism connected with the steering output shaft (10) and wheels (5), the electric power steering system comprises an electronic control unit (9), an electric motor (8) and a speed reducing mechanism (6), and the electric power steering system is characterized by further comprising a multi-disc magnetorheological fluid clutch (7), a torque sensor (2) is arranged on the steering output shaft (10) of the steering wheel (1), the torque sensor (2) is connected with the electronic control unit (9), the electronic control unit (9) controls the output torque of the electric motor (8) through a current signal, the output shaft of the electric motor (8) is connected with the input shaft of the multi-disc magnetorheological fluid clutch (7), the speed reducing mechanism (6) is directly connected with the steering mechanism;
the electronic control unit (9) is combined with a torque signal of the torque sensor (2) and a vehicle speed signal to control the motor (8) to deliver the assistance torque of a corresponding degree, and the multi-disc magnetorheological fluid clutch (7) is used as an intermediate force transmission device to transmit the assistance torque delivered by the motor (8) to the steering mechanism through the speed reducing mechanism (6);
the multi-disc magnetorheological fluid clutch (7) comprises a driving shaft (20) used for being connected with a motor (8), a supporting seat (17) in a hollow symmetrical shell structure, a mounting shaft hole arranged in the center of the supporting seat (17), and mounting parts symmetrically arranged on two sides of the mounting shaft hole, wherein the supporting seat (17) and the driving shaft (20) are connected into a whole, the mounting shaft hole is used for connecting an output shaft of the motor (8) and mounting a driven shaft (13), the driven shaft (13) is connected with a speed reducing mechanism (6) after extending out of the supporting seat (17), and a multi-disc structure, transmission medium magnetorheological fluid and a coil (18) used for controlling the form change of the magnetorheological fluid are arranged in the mounting parts;
the multi-disc structure comprises driving discs (11), driven discs (12) and driving cylinders (16), wherein the driving discs (11), the driven discs (12) and the driving cylinders (16) are arranged in a staggered contact mode, the driving cylinders (16) are symmetrically fixed inside supporting seats (17), the driving discs (11) are fixed on the driving cylinders (16) through fixing pins, and the driven discs (12) are fixed on driven shafts (13) through spline hubs;
the multi-disc structure comprises three driving discs (11) and two driven discs (12), wherein the two driven discs (12) are symmetrically arranged on two sides of one driving disc (11), and the other two driving discs (11) are symmetrically arranged on two sides of the two driven discs (12) respectively.
2. The electric power steering system based on the multi-disc magnetorheological fluid clutch according to claim 1, wherein the gap between the driving disc (11) and the driven disc (12) is filled with magnetorheological fluid, and the form change of the magnetorheological fluid is controlled by applying different currents to the coils (18) to generate magnetic fields with different strengths.
3. The electric power steering system based on the multi-disc magnetorheological fluid clutch according to claim 1, wherein the driven shaft (13) is fixed in the mounting shaft hole of the support seat (17) through a rolling bearing (15) and an oil seal (14), the oil seal (14) is a concentric ring structure with the same diameter as the mounting shaft hole, the axis of the concentric ring structure coincides with the axis of the mounting shaft hole and is fixed on the inner wall of the support seat (17), and the two oil seals (14) are respectively in sliding sealing contact with the two driving discs (11) symmetrically arranged on two sides of the two driven discs (12).
4. The electric power steering system based on the multi-disc magnetorheological fluid clutch according to claim 1, wherein the steering mechanism comprises a steering gear (3) and a rack (4) connected with the steering gear (3), and wheels (5) are respectively connected with two sides of the rack (4).
5. The electric power steering system based on the multi-disc magnetorheological fluid clutch according to claim 4, wherein a steering gear (3) is connected to the lower end of the steering output shaft (10) through a connecting rod.
6. The electric power steering system based on the multi-disc magnetorheological fluid clutch according to claim 1, wherein the side wall of the support seat (17) is provided with heat dissipation holes (19).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110106215.1A CN112744288B (en) | 2021-01-26 | 2021-01-26 | Electric power steering system based on multi-disc type magnetorheological fluid clutch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110106215.1A CN112744288B (en) | 2021-01-26 | 2021-01-26 | Electric power steering system based on multi-disc type magnetorheological fluid clutch |
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| CN112744288A CN112744288A (en) | 2021-05-04 |
| CN112744288B true CN112744288B (en) | 2022-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110106215.1A Active CN112744288B (en) | 2021-01-26 | 2021-01-26 | Electric power steering system based on multi-disc type magnetorheological fluid clutch |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102878225A (en) * | 2012-10-14 | 2013-01-16 | 吉林大学 | Multiple-piece magneto-rheological fluid torque transferring device |
| CN107355490A (en) * | 2017-09-14 | 2017-11-17 | 合肥工业大学 | A kind of magnetorheological transmission brake-by-wire device |
| CN107531272A (en) * | 2015-04-15 | 2018-01-02 | 德尔福技术有限公司 | Steering and method for autonomous vehicle |
| CN108045430A (en) * | 2018-01-02 | 2018-05-18 | 中国第汽车股份有限公司 | Dual redundant electrically powered steering apparatus using same |
| CN108407887A (en) * | 2018-05-02 | 2018-08-17 | 吉林大学 | Power sense feedback device and application method made from magnetorheological fluid birotor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100421423B1 (en) * | 2001-02-10 | 2004-03-09 | 한국과학기술원 | An Electric Steering Wheel Device Using A Semi Active Actuator |
-
2021
- 2021-01-26 CN CN202110106215.1A patent/CN112744288B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102878225A (en) * | 2012-10-14 | 2013-01-16 | 吉林大学 | Multiple-piece magneto-rheological fluid torque transferring device |
| CN107531272A (en) * | 2015-04-15 | 2018-01-02 | 德尔福技术有限公司 | Steering and method for autonomous vehicle |
| CN107355490A (en) * | 2017-09-14 | 2017-11-17 | 合肥工业大学 | A kind of magnetorheological transmission brake-by-wire device |
| CN108045430A (en) * | 2018-01-02 | 2018-05-18 | 中国第汽车股份有限公司 | Dual redundant electrically powered steering apparatus using same |
| CN108407887A (en) * | 2018-05-02 | 2018-08-17 | 吉林大学 | Power sense feedback device and application method made from magnetorheological fluid birotor |
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