CN101780809A - Electric power steering gear - Google Patents
Electric power steering gear Download PDFInfo
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- CN101780809A CN101780809A CN200910045475A CN200910045475A CN101780809A CN 101780809 A CN101780809 A CN 101780809A CN 200910045475 A CN200910045475 A CN 200910045475A CN 200910045475 A CN200910045475 A CN 200910045475A CN 101780809 A CN101780809 A CN 101780809A
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Abstract
The invention relates to a part of an automobile, in particular to an electric power steering gear (P-EPS) structure for an automobile. In order to solve the technical problems of fuel oil consumption of the traditional hydraulic power steering system of the automobile, save energy sources and reduce emission, the invention adopts the technical scheme comprising a steering torque sensor directly driven by a steering wheel, a steering motor, and a shell and left and right tie rod of a rack shaft, wherein a pinion at the lower part of the steering torque sensor drives a rack; the steering torque sensor detects moment and position signals on a steering shaft, and the moment and position signals are continually input to a microcomputer control unit together with vehicle speed signals measured by a vehicle speed sensor; the steering motor is arranged on the inner wall of the middle part of a middle column tube of the steering gear; the inner wall of the middle column tube of the steering gear is provided with a speed reducer; and the speed reducer adopts recirculating ball type speed reducing gear assorted with the inner shell of a motor rotor. The electric power steering gear of the automobile provides required auxiliary power to achieve stable manipulation, light steering and safe running.
Description
Technical field
The present invention relates to the spare and accessory parts of automobile, particularly relate to electric automotive power-assisted steering device (P-EPS) structure.
Background technology
Traditional automobile steering device has the rack-and-gear transmission, and the transmission of worm screw roller also has ball-and-worm steering system.As steering boost system, fluid-link steering pump drive and electric boosted automobile steering device are arranged.First three is planted and is mechanical drive, and last two kinds is the auxiliary power deflector.Because traditional automobile steering device, the transmitting ratio scope of design is little, is used on the automobile, needs hydraulic steering pump or electrical motor and worm speed reducer as force aid system, and still, the load of the increase driving engine that it will be direct or indirect has increased the consumption of fuel.Traditional mechanical transmission automobile steering device also has common shortcoming except above-mentioned shortcoming.Be exactly complex structure, working accuracy is not easy control.Productive costs is too high.Can't realize normalisation, producing in serial form.
Along with the development of automotive electronic technology, some cars have used electric booster steering device at present, and economy, dynamic property and the manoevreability of automobile are all increased.Because electric boosting steering system only needs electric power without hydraulic pressure, compares with the mechanical type hydraulic power steering system and has omitted many elements.Do not have the needed oil pump of hydraulic efficiency pressure system, oil pipe, pressure flow control cock, petrol storage tank etc., number of parts is few, and arrangement convenience is in light weight.And nothing " no load losses " and leak of liquid loss.Therefore electric boosting steering system all can save energy about 80% under various driving conditions, has improved the drive ability of automobile.Therefore being promoted rapidly in recent years, also is the developing direction of servo steering system from now on.EPS is a kind of young mobile intelligence servo steering device of electromechanical integration.During motor turning, electronic controller controls power steering motor provides required auxiliary power-assisted, reaches operation stabilization, turns to light, driving safety, makes driver drives vehicle that good comfort be arranged under different vehicle conditions.Characteristics such as this product with compact structure, energy-saving and environmental protection are the trend of automobile assisted power steering development.
Summary of the invention
In order to solve the fuel oil consumption of existing automobile hydraulic electric power steering system, save the energy and reduce discharging, the invention provides a kind of vehicle electric power-assisted steering device.During motor turning, electronic controller controls power steering motor provides required auxiliary power-assisted, reaches operation stabilization, turns to light, driving safety, makes driver drives vehicle that good comfort be arranged under different vehicle conditions.
The technical solution adopted for the present invention to solve the technical problems comprises the torque sensor by the bearing circle direct drive, and the miniature gears of its underpart drives tooth bar; Rotation direction sensor detects moment and the position signal on the steering shaft, records vehicle speed signal with car speed sensor and constantly imports microcomputer control unit; Steer motor is loaded on the inwall at column jecket middle part, deflector middle part; At deflector middle part column jecket inwall, retarder is installed, this speed reduction gearing is taked the circulating ball formula reducing gear supporting with the rotor inner casing; The shell of rack shaft and left and right sides intermediate rod.
Described electric booster steering device also has rotary angle transmitter, and this sensor belongs to electromagnetic sensor, can be with the steering angle signal output of steer motor to control unit.
Described steering torque sensor comprises two parts, be installed in respectively bearing circle input shaft and turn on the output shaft of miniature gears;
Described steer motor is the three phase alternating current motor of brushless, and stator coil connects for the three-phase double star, and rotor is the strong permanent magnetic formula.
Advantage of the present invention
1, can promote the economy of full car effectively
Electric powered steering just just consumes electric power when the pilot control motor turning, and the driving process of vehicle more than 90% do not need to turn to, and do not consume electric power when not turning to.And the oil pump of hydraulic power-assist steering system is directly by the belt-driving of driving engine, even when automobile does not turn to, Hydraulic Pump also turns round, thus the power of consumption of engine.Statistics are arranged, and both compare, and electric power steering is than hydrostatic steering system fuel-economizing 3%.
2, make motor turning control more flexible
The cornering properties of bearing circle, turn to the stability characteristic (quality) of feel and automobile, can regulate and optimize by software, and be not subjected to the influence of engine speed and power, its function obviously be better than the conventional hydraulic force aid system; The vehicle body stabilizing control system be can cooperate, best steering response and steering effort under the different speed of a motor vehicle, can be realized.
3, road feel is strong, control response is fast
During low speed driving, power driven system provides bigger power-assisted, and degree of power assistance improves and reduces gradually with the speed of a motor vehicle.In order to improve the traveling comfort that travels, most of modern automobilies are equipped with the low pressure tire of broad, have increased tire and ground-surface area of contact like this, can obtain bigger power steering when resistance to motion becomes big.Even engine off, electric boosting steering system can also be worked as usual.Therefore be applicable to very much electronlmobil or hybrid vehicle.
4, peripheral structure is simple
The quality of whole steering hardware realizes lightweight, more compact structure.Owing to there is not hydraulic efficiency pressure system, can saves leakage of oil, change oil, change handling labor such as belt.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the rotation direction sensor assembly;
Fig. 3 is the steer motor assembly.
The specific embodiment
The technical solution adopted for the present invention to solve the technical problems comprises the torque sensor by the bearing circle direct drive, and the miniature gears of its underpart drives tooth bar 8; Rotation direction sensor 9 detects moment and the position signal on the steering shaft, records vehicle speed signal with car speed sensor and constantly imports the microcomputer control unit that is installed in the storage battery below; Steer motor 10 is loaded on the inwall at column jecket 7 middle parts, deflector middle part; At deflector middle part column jecket inwall, retarder is installed, this speed reduction gearing is taked the circulating ball formula reducing gear supporting with the rotor inner casing; The shell of rack shaft and left and right sides intermediate rod (1,2,5,6).
Described electric booster steering device also has rotary angle transmitter, and this sensor belongs to electromagnetic sensor, can be with the steering angle signal output of steer motor to control unit.
Described steering torque sensor comprises two parts, be installed in respectively bearing circle input shaft and turn on the output shaft of miniature gears;
Described steer motor is the three phase alternating current motor of brushless, and stator coil connects for the three-phase double star, and rotor is the strong permanent magnetic formula.
Electric boosting steering system is to realize power-assisted steering swivel system by the work of turning control cell control steer motor.The steering torque of pilot control bearing circle passes to by steering gear and steering track rod on the wheel flutter of automobile; Meanwhile, electronic control unit according to steering torque, the speed of a motor vehicle of travelling at that time and certain designing requirement of pilot control bearing circle at present, calculates needed power steering again.And required power steering is to realize by the voltage and current of adjusting motor, so the steering torque that finally obtains on the wheel flutter is the chaufeur steering torque and turns to electric boosted sum (latter is much larger than the former).Electric turning booster system directly uses power supply, and it is the mechanical power of consumption of engine not, thus can directly not influence the running of driving engine, thereby than traditional hydraulic power-assist steering system fuel saving.
Steering torque sensor comprises two parts, be installed in respectively bearing circle input shaft and turn on the output shaft of miniature gears.(1) rotor portion is made of two-layer up and down, and all torque sensor is housed.Input shaft and output shaft are to be linked into an integrated entity by a thin metallic pin, and there is pin-and-hole the rotor portion top.Input shaft is that rigidity is connected with output shaft top, is that input shaft drives by the rotating shaft of vehicle steering.Its lower floor's rotor drives the translation that miniature gears promotes tooth bar, drives about wheel flutter to turn to.The top section of steering torque sensor is by the bearing circle direct drive, because the lower end does not have load, so its amount of spin and bearing circle rotating shaft are synchronous fully.But the underclad portion of torque sensor has and turns to miniature gears (certain resistance is arranged), middlely drives by thin torsion bar, causes the amount of spin of lower floor's rotor less relatively, and it is poor that this just causes upper and lower layer rotor mechanically can produce relative angular displacement.When motor turning, when different road conditionss ran into different cornering resistances, these two the rotating shaft meetings of input shaft and output shaft produced and turn to the corresponding differential seat angle of level of torque.(2) stationary part also has two-layer coil up and down, the top and the bottom of respective rotor respectively.Stator coil partly has two kinds of coils to distribute, and is respectively excitation coil and magnetic test coil, and the thin wire and the external world that have seven different colours on it get in touch.Its excitation coil to the coil of rotor portion by electromagnetic induction excitation magnetic action-magnetic test coil then will import, the angular difference up and down (turning to torque) of output shaft detects, carry electric signal to electronic control unit, this electric signal is the phase difference with two row sinusoidal waveforms on the stator coil, reflection torque sensing this moment.
At deflector middle part column jecket inwall, assist motor and retarder are installed.Assist motor is the three phase alternating current motor of brushless, and stator coil connects for the three-phase double star, and rotor is the strong permanent magnetic formula.The rotor inertia of this electric machine design is less, becomes steering operation when being convenient to running car flexibly.The change hand of rotation of this motor is extremely convenient, just carries out changing-over and can realize power steering operation rapidly three phase mains any two is alternate.And this motor has the characteristics of low noise, high torque (HT), can overcome the cornering resistance when travelling different kinds of roads, carries out flexible steering operation.Steer motor also has overheat protective function, when temperature surpasses specified value, is protection power supply and the unlikely overload of motor, and should limit the power-assisted electric current of motor this moment, till temperature descends the permissible value of stipulating.
For reducing the rotating speed of steer motor, to obtain bigger moment.Taked the circulating ball formula speed reduction gearing supporting with the rotor inner casing.Minimum steel ball circulating rolling in the groove of four dead smooths slows down, and gives the rack shaft moving linearly with transmission of power, promotes two wheel flutters and swings, and turns to drive automobile.Because steel ball is minimum, circulating rolling in the guide groove of retrofit.So rotational noise is atomic.
Rotary angle transmitter belongs to electromagnetic sensor, can be with the steering angle signal output of steer motor to control unit.This rotor sensor is a salient pole type, and rotor and rotor fuse.It is circular that stator coil is, and is enclosed within outside the rotor, by electromagnetic induction principle, detects the corner of rotor.When opening and inspecting, can not take off this rotary angle transmitter separately, in the time of can only be by the disintegration steering assembly, just can open and inspect.But can detect by the circuit connector on the stator.
Turning control cell is installed in the below of storage battery, and except that the processes sensor semiotic function was arranged, control unit promoted battery tension in addition, inversion is the function of three phase current electricity.Also shorten the cable length between control unit and the power steer assembly, can reduce the loss in voltage of circuit.
Claims (4)
1. electric booster steering device, the steering torque sensor of bag hand bearing circle direct drive, and the miniature gears of steering torque sensor bottom drives tooth bar; Steering torque sensor detects moment and the position signal on the steering shaft, records vehicle speed signal with car speed sensor and constantly imports microcomputer control unit; Steer motor is loaded on the inwall at column jecket middle part, deflector middle part; At deflector middle part column jecket inwall, retarder is installed, this speed reduction gearing is taked the circulating ball formula reducing gear supporting with the rotor inner casing; The shell of rack shaft and left and right sides intermediate rod.
2. electric booster steering device according to claim 1 also includes rotary angle transmitter, and this sensor belongs to electromagnetic sensor, can be with the steering angle signal output of steer motor to control unit.
3. electric booster steering device according to claim 1, described steering torque sensor comprises two parts, be installed in respectively bearing circle input shaft and turn on the output shaft of miniature gears.
4. electric booster steering device according to claim 1, described steer motor are the three phase alternating current motor of brushless, and stator coil connects for the three-phase double star, and rotor is the strong permanent magnetic formula.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910045475A CN101780809A (en) | 2009-01-16 | 2009-01-16 | Electric power steering gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910045475A CN101780809A (en) | 2009-01-16 | 2009-01-16 | Electric power steering gear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101780809A true CN101780809A (en) | 2010-07-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910045475A Pending CN101780809A (en) | 2009-01-16 | 2009-01-16 | Electric power steering gear |
Country Status (1)
| Country | Link |
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| CN (1) | CN101780809A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102530061A (en) * | 2012-02-25 | 2012-07-04 | 苏州先锋物流装备科技有限公司 | Carrier-and-stacker with electric power steering |
| CN103909967A (en) * | 2014-03-28 | 2014-07-09 | 三一汽车起重机械有限公司 | Parallel hybrid vehicle steering control system and hybrid vehicle |
| CN113945391A (en) * | 2021-10-15 | 2022-01-18 | 安徽江淮汽车集团股份有限公司 | Fuel-saving test method and system for light truck electric steering |
-
2009
- 2009-01-16 CN CN200910045475A patent/CN101780809A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102530061A (en) * | 2012-02-25 | 2012-07-04 | 苏州先锋物流装备科技有限公司 | Carrier-and-stacker with electric power steering |
| CN103909967A (en) * | 2014-03-28 | 2014-07-09 | 三一汽车起重机械有限公司 | Parallel hybrid vehicle steering control system and hybrid vehicle |
| CN103909967B (en) * | 2014-03-28 | 2016-05-25 | 三一汽车起重机械有限公司 | parallel hybrid electric vehicle steering control system and hybrid vehicle |
| CN113945391A (en) * | 2021-10-15 | 2022-01-18 | 安徽江淮汽车集团股份有限公司 | Fuel-saving test method and system for light truck electric steering |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20100721 |