CN201077476Y

CN201077476Y - B grade speed-down dynamoelectric power-assisted steering device

Info

Publication number: CN201077476Y
Application number: CNU2007201142414U
Authority: CN
Inventors: 周珑; 王望予; 杨硕
Original assignee: HANGZHOU SHIBAO AUTO STEERING GEAR CO Ltd
Current assignee: HANGZHOU SHIBAO AUTO STEERING GEAR CO Ltd
Priority date: 2007-09-04
Filing date: 2007-09-04
Publication date: 2008-06-25
Anticipated expiration: 2017-09-04

Abstract

The utility model discloses a vehicle steering service, in particular to an automobile secondary deceleration electrical power-assisted steering service, which comprises a motor, a gear shaft connected with a steering axle. In terms of the structure, the utility model has the advantages that a serrated synchronizing belt deceleration torque-multiplying apparatus, a recirculating ball deceleration apparatus, an ECU controller and a torque sensor arranged on the steering axle, wherein the gear shaft is meshed with the recirculating ball deceleration torque-multiplying apparatus and the serrated synchronizing belt deceleration torque-multiplying apparatus in turn; the torque sensor, the ECU controller and the motor are connected with the serrated synchronizing belt deceleration torque-multiplying apparatus. The utility model has the advantages of low requirement of the manufacture precision, high quality, low cost, anti-slip and convenient gap remove.

Description

Double-reduction electric power-assisted steering device

Technical field

The utility model relates to a kind of steering device for motor vehicle, especially a kind of double-reduction electric power-assisted steering device that is used for automobile.

Background technology

Before electric power-assisted steering apparatus is applied, widely used is hydraulic power steering apparatus, this device is big and the assist characteristic of non-velocity response type is arranged because of big, the unfavorable environmental protection of consumption of fuel, complex structure, weight, and the electric power-assisted steering apparatus that is got up by developed recently gradually replaces.These two kinds all is to grow up on the basis of mechanical steering device.

Electric power-assisted steering apparatus has overcome the shortcoming of hydraulic power steering system, and because of reliable operation, energy-saving and environmental protection and fault develop very soon less, especially the entrucking rate on Japan, European passenger car increases rapidly.But the turbine and worm decelerator in the electric power-assisted steering apparatus is very high to the requirement of accuracy of manufacture, makes worm screw and need use specialized equipment; Though wear-resisting with the worm gear parts of tooth that plastics are made, the gap that the wearing and tearing back produces is difficult to eliminate, and makes the manufacturing process of worm gear more complicated; Adopt this mechanism also can cause the installation site of motor restricted, and layout is onboard brought difficulty with problems such as interference are installed.

Summary of the invention

Technical problem to be solved in the utility model provides that a kind of accuracy of manufacture requirement is lower, quality is high, cost is low, anti-skidding easy antibacklash double-reduction electric power-assisted steering device.

The technical scheme in the invention for solving the above technical problem is: this device comprises electrical motor, the gear wheel shaft that links to each other with steering shaft, its constructional feature is also to be provided with tooth form synchronous belt to slow down to increase and turn round mechanism, recirculating ball and slow down to increase and turn round mechanism, ECU controller and be installed in torque sensor on the steering shaft, wherein gear wheel shaft and recirculating ball slow down to increase and turn round mechanism, tooth form synchronous belt and slow down to increase and turn round mechanism and intermesh successively, and torque sensor, ECU controller, electrical motor and tooth form synchronous belt deceleration increase to be turned round mechanism and be connected successively.

Tooth form synchronous belt described in the utility model slows down to increase and turns round mechanism and comprise that the driving tooth that is linked to each other by tooth form synchronous belt is just as step belt wheel and driven toothed synchronous pulley.

Recirculating ball described in the utility model slows down to increase and turns round mechanism and comprise nut, tooth bar screw rod and steel ball, and nut is positioned in the driven toothed synchronous pulley, and nut is meshed with an end of tooth bar screw rod by steel ball, and the other end of tooth bar screw rod then is meshed with gear wheel shaft.

Driving tooth described in the utility model is connected with the output shaft of electrical motor just as the step belt wheel.

Steering shaft described in the utility model is connected with steering handwheel.

The utility model compared with prior art, has following beneficial effect: 1, adopt two reduction gear to replace turbine and worm decelerator, two reduction gear is slowed down to increase by tooth form synchronous belt and turns round mechanism and recirculating ball and slow down to increase and turn round mechanism and forms, and used unit is specialized factory and makes, and design and processes is maturation all, can purchase in batches, need not purchase the specialized equipment of machining worm, needn't the high worm and gear housing of requirement on machining accuracy, up-front investment is few, productive costs is low, and quality easily guarantees; 2, the size of this two reduction gear is little, and position of An Zhuaning and direction are very flexible onboard, and alternative installation site is many, can avoid with circumferential component assembling taking place and interfere;

Non-slip when the tooth form synchronous belt that 3, is adopted is worked, wearing and tearing are after adjustment can be eliminated the gap.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

The specific embodiment

Referring to Fig. 1, present embodiment comprise gear wheel shaft 4, electrical motor 12, tooth form synchronous belt slow down increase turn round the I of mechanism, recirculating ball slows down to increase and turns round II of mechanism and ECU controller 13, gear wheel shaft 4 links to each other with steering shaft 3, and torque sensor 2 is installed on the steering shaft 3, and steering shaft 3 is connected with steering handwheel 1.Tooth form synchronous belt slows down to increase and turns round the I of mechanism and comprise that the driving tooth that is linked to each other by tooth form synchronous belt 10 is just as step belt wheel 11 and driven toothed synchronous pulley 6, recirculating ball slows down to increase and turns round the II of mechanism and comprise nut 7, tooth bar screw rod 5 and steel ball 9, nut 7 is fixed in the driven toothed synchronous pulley 6, and nut 7 is meshed with an end of tooth bar screw rod 5 by steel ball 9, and the other end of tooth bar screw rod 5 then is meshed with gear wheel shaft 4.Nut 7 is fixed at axial direction, but can be around the rotational of tooth bar screw rod 5.The output shaft of torque sensor 2, ECU controller 13, electrical motor 12 is connected just as step belt wheel 11 with driving tooth successively.

Deceleration in the present embodiment increases to be turned round mechanism and is slowed down to increase by tooth form synchronous belt and turn round the I of mechanism and recirculating ball and slow down to increase and turn round the II of mechanism and form jointly, and finishing slows down increases torsion effect.Wherein the tooth form synchronous belt of the first order slows down to increase and turns round the I of mechanism and only bear torque from electrical motor 12, and partial recirculating ball slows down to increase and turns round the II of mechanism and make to slow down and increase the overall dimensions of turning round mechanism and reduce.

The effect of torque sensor 2 is torque and angular signals of gathering steering handwheel 1, and is that electric signal is transported to ECU controller 13 with this signal transition.

The effect of electrical motor 12 is to change the electric energy from storage battery into mechanical energy, increases to double reduction then and turns round mechanism's output.

The effect of ECU controller 13 is the signals that provide according to torque sensor 2 and car speed sensor; after carrying out logic analysis calculating; send 12 actions of instruction control electrical motor; by gathering signals such as motor current, generator voltage, engine operating condition; judge whether working state of system is normal, as occur unusually, automatically the effect of cancellation power-assisted; also will carry out Analysis on Fault Diagnosis simultaneously, ECU controller 13 has the fault diagnosis functions of safety guard-safeguard.

Slow down to increase by tooth form synchronous belt and turn round the I of mechanism and recirculating ball and slow down to increase and turn round double reduction that the II of mechanism forms and increase and turn round mechanism, its function is reduction of speed, increases and turn round, promptly after the rotating speed, torque that obtain from electrical motor 12, increase through double reduction and to turn round mechanism and make that rotating speed reduces, torque increases, thereby reach the power-assisted effect, will rotate transmission simultaneously and become the straight-line displacement transmission.Detailed process is: chaufeur rotates steering handwheel 1, and torque sensor 2 changes the angular displacement signal that relatively rotates of steering shaft 3 and gear wheel shaft 4 into electric signal, and reaches ECU controller 13, and vehicle speed signal is also imported ECU controller 13 into simultaneously.ECU controller 13 is determined the hand of rotation and the power torque size of electrical motor 12 simultaneously signal to be sent to motor drive circuit with driving motor 12 according to above two signals.The driving tooth of respective torque in the first order of electrical motor 12 output just as step belt wheel 11, tooth form synchronous belt 10, driven toothed synchronous pulley 6 slow down increase turn round after, slow down to increase once more by the nut in the second stage 7, steel ball 9 and tooth bar screw rod 5 again and turn round, and will rotatablely move change straight line into and move after, through intermediate rod 8 externally output finish the power steering effect.

Claims

1. double-reduction electric power-assisted steering device, comprise electrical motor (12), the gear wheel shaft (4) that links to each other with steering shaft (3), it is characterized in that: also be provided with tooth form synchronous belt and slow down to increase and turn round mechanism (I), recirculating ball slows down to increase and turns round mechanism (II), ECU controller (13) and be installed in torque sensor (2) on the steering shaft (3), wherein gear wheel shaft (4) and recirculating ball slow down to increase and turn round mechanism (II), tooth form synchronous belt slows down to increase and turns round mechanism (I) and intermesh torque sensor (2) successively, ECU controller (13), electrical motor (12) and tooth form synchronous belt slow down to increase and turn round mechanism (I) and be connected successively.

2. double-reduction electric power-assisted steering device according to claim 1 is characterized in that: described tooth form synchronous belt slows down to increase and turns round mechanism (I) and comprise that the driving tooth that is linked to each other by tooth form synchronous belt (10) is just as step belt wheel (11) and driven toothed synchronous pulley (6).

3. double-reduction electric power-assisted steering device according to claim 1 and 2, it is characterized in that: described recirculating ball slows down to increase and turns round mechanism (II) and comprise nut (7), tooth bar screw rod (5) and steel ball (9), nut (7) is positioned in the driven toothed synchronous pulley (6), and nut (7) is meshed by the end of steel ball (9) with tooth bar screw rod (5), and the other end of tooth bar screw rod (5) then is meshed with gear wheel shaft (4).

4. double-reduction electric power-assisted steering device according to claim 1 and 2 is characterized in that: described driving tooth is connected with the output shaft of electrical motor (12) just as step belt wheel (11).

5. double-reduction electric power-assisted steering device according to claim 1 is characterized in that: described steering shaft (3) is connected with steering handwheel (1).