CN201002638Y - Electric booster steering device for automobile - Google Patents

Abstract

The utility model discloses a vehicle used electro power-assisted steering device, mechanical drive part of which is an over-type worm gear pair, and electronic detection control part of which is consisting of a phase differential torque sensor and an electronic control unit. The worm gear is on an output shaft and the worm is connected with a motor clutch; each side of the phase differential torque sensor is connected with an input shaft and the output shaft separately; the phase differential torque sensor outputs a torque and a corner signal; a input signal preposition processing circuit of the electronic control unit processes an engine speed signal, a vehicle speed signal and an absolute corner signal; the output signal controls the motor operation direction and the magnitude of an assistant moment. The utility model has the functions of a speed automatic compensation, a failure self judgment, an aligning control and a resistance control, which can integrate an absolute turning signal of the wheel into other technical systems of the vehicle and meanwhile is wear resistant, corruption resistant and low in noise.

Description

A kind of electric automotive servo steering device

Technical field:

The utility model relates to the automobile steering hardware, particularly relates to the electric automotive servo steering device.

Background technology:

Existing automobile electric power steering (EPS) device mainly is made up of mechanical driving part and detection of electrons control part; Mechanical driving part mainly is that gear pair plays to slow down and increases the transfer function of turning round, and the detection of electrons control part mainly is made up of electronic control unit and potentiometer type torque sensor or electromagnetism general formula torque sensor; Its electronic control unit has the power operated control effect of the different speed of a motor vehicle.But this device in use, and potentiometer type torque sensor precision is low and easy to wear, and electromagnetism general formula torque sensor complex structure costs an arm and a leg; Its gear pair is easy to wear, perishable, self-lubricating is poor, vibration is big, noise is big; And electronic control unit can only provide the power-assisted electric current bunch of the different speed of a motor vehicle, can not initiatively provide resistance to increase the stability of vehicle when high speed.

Summary of the invention:

The purpose of this utility model is to provide a kind of electric automotive servo steering device, it has that noise is little, the gap is little, wear-resistant, returnability good, can control the power-assisted size according to the speed of a motor vehicle, and when high speed, provide the resistance effect, to reduce " unstable " of vehicle, can provide the absolute angular signal steam supply of wheel car other system to use simultaneously.

The technical solution of the utility model is as follows:

The utility model is made up of mechanical driving part and detection of electrons control part; Mechanical driving part is mainly worm gear, worm transmission pair, and the detection of electrons control part is made up of phase-difference type torque sensor and electronic control unit; Its input shaft and output shaft are connected as a single entity, worm gear is on input shaft, worm screw links to each other with power-transfer clutch on the motor, the both sides of phase-difference type torque sensor link to each other with output shaft with input shaft respectively, and the electronic control unit of its phase-difference type torque sensor comprises incoming signal preposing signal process circuit, signal judgment processing circuit and output signal control circuit; The incoming signal front end circuit is handled engine rotational speed signal, vehicle speed signal, torque signal and absolute angular signal, the size of output circuit control motor service direction and assist torque.

Good effect of the present utility model is:

The utility model is simple in structure, and is cheap, easy to maintenance, has the speed automatic compensation, fault is returned positive control, functions such as resistance control from judging, can provide the absolute angular signal of wheel to be integrated into automobile other technologies system, simultaneously can be wear-resisting, corrosion resistant, low noise.

Description of drawings:

Fig. 1 is the utility model structural representation.

Fig. 2 is the utility model steering shaft assembly structure scheme drawing.

Fig. 3 is a worm and gear mounting structure scheme drawing of the present utility model.

The specific embodiment:

The utility model will be further described below in conjunction with accompanying drawing:

In Fig. 1～3, input shaft 1 links to each other with bearing circle with spline by the conical surface 24, transmits the steering torque that applies from bearing circle, and output shaft 7 directly links to each other with wheel through behind universal joint assemblies and the manual steering gear assembly, to wheel transmission steering torque; Worm gear 5 by centrifugally cast MC material attached to forming on the stiffener, be fitted on the output shaft 7 by interference, the assist torque that transmission is transmitted from worm screw 14, its worm and gear transmission has very high transmission efficiency, better stationarity and better wear-resisting, corrosion resistant, high-low temperature resistant and littler assembly clearance and low noise, worm screw 14 links to each other with power-transfer clutch on the motor 41 by spline fitted, transmit motor 41 assist torques, worm screw 14 is by bearing 35,38 are supported on the housing 12, between mould sheet 36 with elasticity, 37, jump ring 40 and adjustable bolt 31 actuating spindles are to assembling, reduce the influence of cumulative errors, can reduce the production tolerance and reduce vibration, the abnormal voice that impacts such as motor 41 commutations cause; Torsion bar 9 links to each other with output shaft 7 with input shaft 1 respectively by pin 2,8, and connection and direction of transfer dish apply moment, produces the gyration variation of input shaft 1 and output shaft 7 simultaneously by elastic deformation; Phase-difference type torque sensor 4 the right and lefts all can rotate with respect to shell, and can link to each other with output shaft 7 with input shaft 1 by double wedge respectively, simultaneously also by housing 12 and pad 29, the position of 30 fixed skew formula torque sensors, 4 circumferencial directions, when input shaft 1 and output shaft 7 relatively rotate or definitely rotate, phase-difference type torque sensor 4 the right and lefts are relatively rotated or definitely rotation, and the generation change of voltage is exported to electronic control unit, phase-difference type torque sensor 4 operating voltages are+5V, when bearing circle left or during turning clockwise, output voltage increases or reduces, and just can judge the direction of bearing circle rotation and the size of moment of torsion according to output voltage values; Electronic control unit is received phase-difference type torque sensor 4 voltage value signals, behind car speed sensor vehicle speed signal and the engine speed sensor signal, offer motor 41 according to the different size of current of control program output, motor 41 changes into output torque and passes to worm screw 41 under the internal magnetic field effect, worm couple plays to slow down and increases the effect amplification assist torque of turning round and pass to output shaft 7, when the speed of a motor vehicle surpasses certain limit, electronic control unit can provide the reversing sense power-assisted, make Vehicular turn become heavy, can effectively reduce the unstable sensation of vehicle, increase vehicular drive stability, the absolute angular signal of system can assist electronic control unit that the vehicle aligning torque is provided in addition, improves the vehicle returnability; Have electric clutch on the motor 41; when electronic control unit plays a role; power-transfer clutch is by adhesive; motor 41 can drive worm screw 14 and transmit assist torque; otherwise then disconnect; motor 41 can not drive the worm screw power-assisted, and the size of operating current has determined the size of power-assisted torque limiting simultaneously, can play the limiting protecting effect.

Claims (2)

1, a kind of electric automotive servo steering device is made up of mechanical driving part and detection of electrons control part, it is characterized in that: mechanical driving part is mainly worm gear (5), worm screw (14) transmission; The detection of electrons control part is made up of phase-difference type torque sensor (4) and electronic control unit; Its input shaft (1) is connected as a single entity with output shaft (7), worm gear (5) by centrifugally cast MC material attached to forming on the stiffener, be fitted in output shaft (7) by interference, worm screw (14) links to each other with power-transfer clutch on the motor (41), and the both sides of phase-difference type torque sensor (4) link to each other with output shaft (7) with input shaft (1) respectively.

2, the power-assisted steering hardware of a kind of electric automotive according to claim 1, it is characterized in that: its electronic control unit comprises the incoming signal preposing signal process circuit, signal judgment processing circuit and output signal control circuit.

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