CN208344325U - A kind of small teeth number difference planet gear active front steering system - Google Patents

Abstract

The utility model discloses a kind of small teeth number difference planet gear active front steering systems, comprising: the first input shaft, one end are connect with vehicle steering wheel, and the other end is fixed with first gear；Rack gear is fixedly mounted in gear ring set, internal circumferential, and the gear ring covers one end center and is extended with hollow shaft, and fixing sleeve is equipped with second gear in the hollow shaft, and the second gear is engaged with the first gear；Second input shaft, one end are fixedly connected with the output end of coupling electric machine, and other end fixing sleeve is equipped with third gear；Eccentric shaft, one end fixing sleeve are equipped with the 4th gear, and the 4th gear is engaged with the third gear, and for other end empty set in the hollow shaft, the eccentric shaft other end eccentric setting has boss.By adding a set of corner coupling mechanism in steering shaft, one can be applied to diverter, front wheel angle is corrected according to the driving cycle of automobile by the corner that steering wheel applies independently of driver, structure is simple.

Description

A kind of small teeth number difference planet gear active front steering system

Technical field

The utility model relates to active steering system of vehicle technical fields, and more particularly, the utility model relates to one kind Small teeth number difference planet gear active front steering system.

Background technique

The performance of automobile steering system has an important influence the safety of automobile, control stability and driving pleasure. Automobile steering system is developed so far from initial mechanical steering system, although performance is increasingly excellent, is not all solved fundamentally The certainly contradiction of steering system " light " and " spirit ", can only compromise one more appropriate fixed value transmission ratio of selection.Although current city Have the diverter of some variable gear ratios on field, such as using become tooth pitch rack gear diverter, but its transmission ratio variation range it is small and It is difficult to.

Active steering system of vehicle can efficiently solve this problem, such as the AFS control system of BMW AG.By Increase the single planet gear type corner coupling mechanism of a set of 2K-H type in steering shaft, active front steering system can be in the effect of controller Under corner that one is applied independently of driver by steering wheel is applied according to the amendment of the driving cycle of automobile to diverter Front wheel angle.Meanwhile compared with wire-controlled steering system, active front steering system remains the machinery between steering wheel and diverter even It connects, improve the reliability of steering system and ensure that driver can obtain reliable road feel feedback.

In addition domestic also to have the patent of part active front steering system, but what is largely used is all increasingly complex pair of structure Rows of planetary gear mechanism.

Utility model content

One purpose of the utility model is to design and develop a kind of small teeth number difference planet gear active front steering system, by turning A set of corner coupling mechanism is added on axis, can be applied one to diverter and be turned independently of driver by steering wheel application Front wheel angle is corrected according to the driving cycle of automobile in turn in angle, and structure is simple.

Technical solution provided by the utility model are as follows:

A kind of small teeth number difference planet gear active front steering system characterized by comprising

First input shaft, one end are connect with vehicle steering wheel, and the other end is fixed with first gear；

Rack gear is fixedly mounted in gear ring set, internal circumferential, and the gear ring covers one end center and is extended with hollow shaft；

Wherein, fixing sleeve is equipped with second gear in the hollow shaft, can engage with the first gear；

Second input shaft, one end are fixedly connected with the output end of coupling electric machine, and other end fixing sleeve is equipped with third gear；

Eccentric shaft, one end fixing sleeve are equipped with the 4th gear, and the 4th gear can be engaged with the third gear, separately One end empty set is in the hollow shaft；

Planetary gear, the relatively described gear ring engagement rotation, and the planetary gear has been uniformly arranged in the circumferential direction multiple first Pin hole,

Wherein, eccentric setting has boss on the eccentric shaft, the centre bore clearance fit with the planetary gear；

Multiple pin shafts comprising first diameter of axle, second diameter of axle and the third diameter of axle；

Wherein, first diameter of axle and second diameter of axle eccentric setting, second diameter of axle and the third diameter of axle are same The heart setting, first diameter of axle respectively with the first pin hole clearance fit；

Output shaft disk, is uniformly arranged in the circumferential direction multiple second pin holes, and the third diameter of axle is sold with described second respectively Interporal lacuna cooperation, the output shaft disk are fixedly connected with automobile steering device.

Preferably,

The eccentricity and first diameter of axle of the eccentric shaft and the boss are identical as the eccentricity of second diameter of axle.

Preferably,

The eccentric diameter of axle is arranged in described eccentric shaft one end；And

Groove is uniformly arranged in the circumferential direction far from one end of the eccentric shaft in the eccentric diameter of axle.

Preferably, further includes:

Electromagnet, axial direction are provided with safety pin, are provided with spring between the electromagnet and safety pin；

Wherein, when the electromagnet powers off, the safety pin is moved under spring force effect far from the electromagnet And engage with the groove, the eccentric shaft is locked；When the electromagnet is powered, the safety pin compressed spring is close to institute Electromagnet movement is stated, and is disconnected with the groove, the eccentric shaft unlock.

Preferably, further includes:

First annular groove is arranged in inside one end that the hollow shaft is covered far from the gear ring, sets on first annular groove It is equipped with the first circlip, for eccentric shaft described in axial restraint；

Second annular groove is arranged in outside the hollow shaft between first annular groove and gear ring set, described the The second circlip is provided on two annular grooves, for second gear described in axial restraint.

Preferably, further includes:

First shell；

Second shell is detachably connected with first shell；

Electromagnetism can is fixed in the first shell, and the electromagnet is fixed at the electromagnetism can On；

Hollow connecting shaft is stretched out along output shaft disk one end center, is connected for fixing with the automobile steering device It connects；

Wherein, first input shaft both ends are rotatably supported at respectively in the first shell and second shell；It is described Second input shaft one end is rotatably supported in the first shell；Described eccentric shaft one end is rotatably supported at the first shell On body, the other end is rotatably supported in the hollow shaft, and the hollow shaft is rotatably supported in the second shell；It is described Hollow connecting shaft is rotatably supported in the second shell.

Preferably, further includes:

Rotary valve is fixedly connected with the hollow connecting shaft；

Diverter comprising turn to pinion gear and steering rack, the output for turning to pinion gear upper end and the rotary valve End is fixedly connected；

Steering gear housing, the steering rack are arranged in the steering gear housing, the steerings pinion gear lower end and described turn To rack gear engaged transmission, and can be axially moved along the steering gear housing；

Hydraulic cylinder, one end are fixedly connected with described steering gear housing one end；

Wherein, piston rod, the fixed company in described piston rod one end and described steering rack one end are equipped in the hydraulic cylinder It connects, the other end is connect with first drag link, and the other end of the steering rack is connected with the second drag link；

First dust cover is set on the hydraulic cylinder, and the other end of one end and the hydraulic cylinder is tightly connected, another It is tightly connected at end and the end variable diameter of the piston rod；

Second dust cover is set on the steering gear housing, and the other end of one end and the steering gear housing is tightly connected, It is tightly connected at the end variable diameter of the other end and the rack gear.

Preferably, further includes:

Steering shaft, one end are fixedly connected with the vehicle steering wheel；

Steering drive axle, one end are connect by the first universal joint with the other end of the steering shaft, and the other end passes through the Two universal joints and the first input axis connection.

It is described in the utility model to have the beneficial effect that

1. the active steering system of vehicle described in the utility model using small teeth number difference planet gear mechanism can match respectively The steering boost system of seed type, including hydraulic power-assist steering system and electric boosting steering system etc..And it has substantially no effect on The mounting arrangements of original steering boost system.

2. it is described in the utility model few using the active steering system of vehicle number of parts of small teeth number difference planet gear mechanism, And design has anti-abating protection device, system reliability is high.

3. few tooth that the active steering system of vehicle described in the utility model using small teeth number difference planet gear mechanism uses Difference planet gear mechanism has biggish transmission ratio variation range, brings conveniently for the selection of coupling electric machine and vehicle matching.

4. the active steering system of vehicle described in the utility model using small teeth number difference planet gear mechanism can with it is various The diverter of type, which matches, to be used.

5. the actuating motor of the active steering system of vehicle described in the utility model using small teeth number difference planet gear mechanism It is arranged in parallel with steering shaft axis, whole system radial dimension can be effectively reduced.

Detailed description of the invention

Fig. 1 is the three-dimensional shaft of the active steering system of vehicle described in the utility model using small teeth number difference planet gear mechanism Mapping.

Fig. 2 is that the active steering system of vehicle corner described in the utility model using small teeth number difference planet gear mechanism couples The three-dimensional axonometric drawing of mechanism.

Fig. 3 is that the active steering system of vehicle corner described in the utility model using small teeth number difference planet gear mechanism couples The elevational cross-sectional view of mechanism.

Fig. 4 is the gear ring set of the active steering system of vehicle described in the utility model using small teeth number difference planet gear mechanism Axonometric drawing.

Fig. 5 is the eccentric shaft of the active steering system of vehicle described in the utility model using small teeth number difference planet gear mechanism Axonometric drawing.

Fig. 6 is the planetary gear of the active steering system of vehicle described in the utility model using small teeth number difference planet gear mechanism Axonometric drawing.

Fig. 7 is the pin shaft axis of the active steering system of vehicle described in the utility model using small teeth number difference planet gear mechanism Mapping.

Fig. 8 is the output shaft of the active steering system of vehicle described in the utility model using small teeth number difference planet gear mechanism Disk axonometric drawing.

Fig. 9 is electrically connecting for the active steering system of vehicle described in the utility model using small teeth number difference planet gear mechanism Connect relational graph.

Specific embodiment

The following describes the utility model in further detail with reference to the accompanying drawings, to enable those skilled in the art referring to explanation Book text can be implemented accordingly.

It should be appreciated that such as " having ", "comprising" and " comprising " term used herein do not allot one or more The presence or addition of a other elements or combinations thereof.

Fig. 1-9 shows a kind of way of realization according to the present utility model, described in the utility model to use few teeth difference row The active steering system of vehicle of star gear mechanism includes steering control mechanism 100, corner coupling mechanism 200, diverter and steering Transmission mechanism 300 and its control system.Wherein, active front steering system controller connects steering-wheel torque by analog signal line and turns Angle transducer connects other onboard sensors, coupling electric machine controller by CAN bus, is connected by switching value analog signal line Solenoid actuated amplifier is connect, realizes the active steering control and anti-fail safe of vehicle.It should be noted that in the present embodiment Hydraulic power-assist steering system and rack and pinion steering gear are selected, but described in the utility model using small teeth number difference planet gear The active steering system of vehicle of mechanism can also match other kinds of steering boost system (such as electric boosting steering system on demand ) and diverter (such as recirculating ball-type steering) EPS.Therefore, by this system and other kinds of steering boost system or diverter Matching is not intended as the innovation to the utility model.

As shown in Figure 1, the active steering system of vehicle described in the utility model using small teeth number difference planet gear mechanism Steering control mechanism 100 includes that steering wheel 101, steering shaft 102, No.1 universal joint 103, steering drive axle 104 and No. two are universal Section 105.The steering wheel 101 can select three width formulas or four width formula steering wheels on demand.102 upper end of steering shaft by spline with Steering wheel 101 connects.The steering drive axle 104 is by being machined with the casing of internal spline and being machined with the axle sleeve of external splines mounted in one It rises, passes through the opposite length for sliding adjustable transmission shaft 104 between casing and axis.104 upper end of steering drive axle is logical It crosses No.1 universal joint 103 to connect with steering shaft 102, lower end is connect by No. two universal joints 105 with corner coupling mechanism 200.It is logical Cross the general layout requirement that different automobile types are adapted to using the steering drive axle 104 of universal joint 103,105 and adjustable in length.

As shown in Figure 1, 2, the active steering system of vehicle described in the utility model using small teeth number difference planet gear mechanism Diverter and steering gear 300 include rotary valve 301, diverter 302,303, two steering gear housing 306, hydraulic cylinder structures Identical drag link 305 and the identical dust cover 304 of two structures.The diverter 302 is by steering pinion gear and rack gear two Be grouped as, one end of rack gear is connected with the piston rod of hydraulic cylinder 303, the other end of the other end and hydraulic cylinder 303 respectively with a left side The 305 bulb pin connection of drag link of right two sides.The rack gear of diverter 302 is placed on 306 inner cavity of steering gear housing, can be in steering gear housing It is intracavitary in 306 to be axially moveable；The cylinder body of 306 one end of steering gear housing and hydraulic cylinder 303 is connected, and 303 accommodated inside of hydraulic cylinder is living Stopper rod, piston rod can the downward axis of dragging inside hydraulic cylinder 303 in steering gear rack it is mobile.Prevent 303 side of hydraulic cylinder 304 one end of dust hood is fixed on the annular groove of 303 end of hydraulic cylinder by clip, and the other end is fixed on the end variable diameter of piston rod Place realizes flexible sealing when piston rod stretches out, dust is avoided to enter inside hydraulic cylinder；304 one end of dust cover of rack gear side It is fixed on by clip on the annular groove of 306 end of steering gear housing, the other end is fixed at the end variable diameter of rack gear, is stretched out in rack gear The flexible sealing of Shi Shixian, avoids that dust enters rack gear and clamping stagnation occurs in the guiding contact surface of steering gear housing 306.Diverter 302 Steering pinion gear upper end and 301 output end of rotary valve be connected, the rack gear engaged transmission of lower end and diverter 302.As one kind Embodiment, the rotary valve 301 use existing normal streaming rotary valve, and the output end of input terminal and corner coupling mechanism 200 passes through flower Key connection.

It is turned to used by active steering system of vehicle described in the utility model using small teeth number difference planet gear mechanism Device, steering gear and steering boost system, as one embodiment its with existing pinion and-rack hydraulic power-assisted steering Systems compliant, herein no longer narration in detail.

Active steering system of vehicle core component described in the utility model using small teeth number difference planet gear mechanism is to turn Angle coupling mechanism 200.As shown in Figure 2,3, there are two mutually independent input terminal and one are common for small teeth number difference planet gear mechanism Output end.Wherein steering wheel 101 controls an input terminal, coupling by steering control mechanism 100 and steering wheel input shaft 221 It closes motor 231 and controls another input terminal, output end is connected to rotary valve 301 by output shaft disk 244.Two power transmit road Line is respectively:

Route 1: steering wheel 101-steering shaft, 102-No.1 universal joint, 103-steering drive axle, 104-No. two universal joints 105-223-the gear rings of gear of steering wheel 221-No.1 of input shaft gear 222-two cover 224-241-planetary gears of gear ring 242-244-rotary valves of pin shaft 243-output shaft disk 301.

Route 2: the 233-eccentric shaft of gear of gear 232-four of coupling electric machine 231-three, 234-planetary gear 242-pin 244-rotary valve of axis 243-output shaft disk 301.

As shown in Fig. 2,3 and 4, the steering wheel power input portion is mainly by steering wheel input shaft 221, No.1 gear 222,224 composition of No. two gears 223 and gear ring set.Described 221 one end of steering wheel input shaft and steering control mechanism 100 connects It connects, the other end is equipped with external splines, and No.1 gear 222 is equipped with corresponding internal splined hole, steering wheel input shaft 221 and No.1 Gear 222 is connected by spline.Meanwhile passing through bearing respectively at 221 both ends outer diameter of steering wheel input shaft and being supported on left shell 211 On right shell body 212.The gear ring 241 is mounted on gear ring by welding and covers inner cavity at 224 major diameters, the gear ring It covers and is equipped with external splines at 224 paths, No. two gears 223 are equipped with corresponding internal splined hole, gear ring set 224 and No. two gears 223 are connected by spline.The gear ring, which covers, is additionally provided with axle journal 224a for installing bearing at 224 paths, and in interior outside cylinder There are two annular groove 224b and 224c for installing circlip to realize another axis at No. two gears 223 and inner hole for processing on face The axially position held.Gear ring set 224 is respectively by bearing support on right shell body 212 and eccentric shaft 234.

As shown in Fig. 2,3 and 5, the coupling electric machine power input portion is mainly by 231, No. three gears of coupling electric machine 232, No. four gears 233 and eccentric shaft 234 form.231 output shaft of coupling electric machine is equipped with external splines, No. three gears 232 It is equipped with corresponding internal splined hole, 231 output shaft of coupling electric machine is connect with No. three gears 232 by spline.Described is inclined Mandrel 234 is machined with 7 sections of axle journals altogether from left to right.Wherein, the left end axle journal 234a is equipped with uniformly distributed groove.Axle journal 234b and 234e For installing bearing, makes it through bearing and be supported on left shell 211 and gear ring 224 path inner holes of set.Axle journal 234d is equipped with outer Spline, No. four gears 233 are equipped with corresponding internal splined hole, and eccentric shaft 234 is connect with No. four gears 233 by spline.Axis The axis of neck 234g (boss) and other axle journal eccentric axis, with the centre bore clearance fit of planetary gear 242 or using needle roller axis It holds or bushing cooperates.

As shown in Fig. 2,3,6,7 and 8, the small teeth number difference planet gear mechanism is mainly by gear ring 241, planetary gear 242, pin Axis 243 and output shaft disk 244 form.The gear ring 241 and planetary gear 242 differ 1~4 tooth, and specific tooth difference can be with Matched design is required according to 231 reduction ratio of coupling electric machine, tooth difference is smaller, and step-down ratio is bigger；Tooth difference is bigger, step-down ratio It is smaller.As shown in fig. 6, in order to prevent due to teeth number difference seldom caused by internal messing wheel interference of tooth, the two, which is processed into, nibbles greatly Close angle tooth form.As shown in fig. 7, the pin shaft 243 is machined with 3 sections of axle journals altogether from left to right, intermediate 243b is relatively large in diameter, both sides The diameter of 243a and 243c is smaller.Axle journal 243a and other two sections of axle journal bias, the eccentricity phase of eccentricity and eccentric shaft 234 Together.6 pin holes of processing, the gap axle journal 243a with the pin shaft 243 as shown in fig. 6, planetary gear 242 is uniformly distributed along the circumference Cooperation.6 pin holes of processing, the axis with the pin shaft 243 as shown in figure 8, the output shaft disk 244 is equally uniformly distributed along the circumference Neck 243c clearance fit.The axle journal 244a of the output shaft disk 244 makes it through bearing and is supported on end cap for installing bearing On 213.The output shaft disk 244 is machined with internal splined hole and then is connect with rotary valve 301 by spline.

242 center of planetary gear, 244 center of output shaft disk, the center axle journal 243a of pin shaft 243 and the pin shaft 243 The center axle journal 243c constitute a parallelogram, by the rotation of planetary gear 242 centering transmission output.

It can be seen that steering wheel input corner may be implemented for the corner coupling mechanism 200 and coupling electric machine input turns The coupling at angle can provide an additional rotation angle to diverter by control coupling electric machine, realize the active steering of vehicle.Pass through Match No.1 gear 222 and the number of teeth of No. two gears 223, the number of teeth of No. three gears 232 and No. four gears 233, gear ring 241 and row The number of teeth of star-wheel 242 can match to obtain the steering wheel input terminal biography different to output end to output end, coupling electric machine input terminal Dynamic ratio, adapts to different variable automobile steering gear ratio demands.

For the reliability for guaranteeing steering system, the automobile primary described in the utility model using small teeth number difference planet gear mechanism Dynamic steering system is additionally provided with anti-abating protection device.As shown in Figures 2 and 3, when the systems are operating normally, electromagnet 251 obtains electric, peace Full pin compression internal reset spring is in retracted mode, and eccentric shaft 234 can rotate under the control of coupling electric machine 231.Work as coupling When motor 231 breaks down, 251 power loss of electromagnet, safety pin pops up under spring force, and it is recessed to be stuck in 234 left end of eccentric shaft In slot, eccentric shaft 234 is locked motionless.At this point, the output of corner coupling mechanism 200 is determined by steering wheel 101 completely, not shadow Steering system is rung to work normally.And by adjusting the number of teeth of No.1 gear 222 and No. two gears 223, gear ring 241 and planetary gear 242 number of teeth can make the transmission ratio of power transmission line 1 close to 1.Therefore, described in the utility model to use fewer differential teeth planetary What the active steering system of vehicle of gear mechanism can be convenient matches with existing automobile steering device.

As shown in Figures 2 and 3, the active steering system of vehicle described in the utility model using small teeth number difference planet gear mechanism Corner coupling mechanism 200 installation relation are as follows: gear ring set 224 and gear ring 241 be welded as a whole.Planetary gear 242 and gear ring 241 Engagement, the centre bore of planetary gear 242 and the axle journal 234g clearance fit of eccentric shaft 234, and filled on the axle journal 234e of eccentric shaft 234 There is bearing to be supported on it on gear ring set 224, the gap axle journal 243a of pin hole and pin shaft 243 that planetary gear 242 is uniformly distributed along the circumference Cooperation.The axle journal 243c clearance fit of the pin hole and pin shaft 243 that are uniformly distributed along the circumference on output shaft disk 244.By gear ring cover 224, Gear ring 241, planetary gear 242, pin shaft 243, output shaft disk 244 and the installation of eccentric shaft 234 are packed into right shell body 212 simultaneously after being integrated End cap 213 is installed, above-mentioned component is supported on right shell body 212 and end cap 213 by bearing, and right shell body 212 and end cap 213 pass through It is bolted.No. two gears 223 are connect with gear ring set 224 by spline, and No.1 gear 222 passes through with steering wheel input shaft 221 Spline connection, steering wheel input shaft 221 are supported on left shell 211 and right shell body 212 by bearing.No. three gears 232 and coupling The output shaft for closing motor 231 is connected by spline, and No. four gears 233 are connect with eccentric shaft 234 by spline, 234 He of eccentric shaft The output shaft of coupling electric machine 231 is supported on left shell 211 by bearing, and left shell 211 and right shell body 212 are connected by bolt It connects.Electromagnet 251 is mounted on electromagnetism can 214 by bolt, and electromagnetism can 214 is mounted on left shell 211 by bolt. Left shell 211, right shell body 212, end cap 213 and coupling electric machine 231 shell be each attached on vehicle body.

Small teeth number difference planet gear active front steering system described in the utility model, by adding a set of corner in steering shaft Coupling mechanism can apply corner that one is applied independently of driver by steering wheel according to the row of automobile to diverter Operating condition amendment front wheel angle is sailed, structure is simple.

It is not only in the description and the implementation although the embodiments of the present invention have been disclosed as above Listed utilization, it can be applied to various fields suitable for the present invention completely, for those skilled in the art, Other modifications may be easily implemented, therefore without departing from the general concept defined in the claims and the equivalent scope, this reality It is not limited to specific details and legend shown and described herein with novel.

Claims (8)

1. a kind of small teeth number difference planet gear active front steering system characterized by comprising

First input shaft, one end are connect with vehicle steering wheel, and the other end is fixed with first gear；

Rack gear is fixedly mounted in gear ring set, internal circumferential, and the gear ring covers one end center and is extended with hollow shaft；

Wherein, fixing sleeve is equipped with second gear in the hollow shaft, can engage with the first gear；

Second input shaft, one end are fixedly connected with the output end of coupling electric machine, and other end fixing sleeve is equipped with third gear；

Eccentric shaft, one end fixing sleeve are equipped with the 4th gear, and the 4th gear can be engaged with the third gear, the other end Empty set is in the hollow shaft；

Planetary gear, the relatively described gear ring engagement rotation, and the planetary gear has been uniformly arranged in the circumferential direction multiple first pin holes,

Wherein, eccentric setting has boss on the eccentric shaft, the centre bore clearance fit with the planetary gear；

Multiple pin shafts comprising first diameter of axle, second diameter of axle and the third diameter of axle；

Wherein, first diameter of axle and second diameter of axle eccentric setting, second diameter of axle with the third diameter of axle is concentric sets Set, first diameter of axle respectively with the first pin hole clearance fit；

Output shaft disk is uniformly arranged in the circumferential direction multiple second pin holes, and the third diameter of axle is respectively between second pin hole Gap cooperation, the output shaft disk are fixedly connected with automobile steering device.

2. small teeth number difference planet gear active front steering system as described in claim 1, which is characterized in that

The eccentricity and first diameter of axle of the eccentric shaft and the boss are identical as the eccentricity of second diameter of axle.

3. small teeth number difference planet gear active front steering system as claimed in claim 1 or 2, which is characterized in that

The eccentric diameter of axle is arranged in described eccentric shaft one end；And

Groove is uniformly arranged in the circumferential direction far from one end of the eccentric shaft in the eccentric diameter of axle.

4. small teeth number difference planet gear active front steering system as claimed in claim 3, which is characterized in that further include:

Electromagnet, axial direction are provided with safety pin, are provided with spring between the electromagnet and safety pin；

Wherein, when the electromagnet power off when, the safety pin spring force effect under far from the electromagnet move and with The groove engaging, the eccentric shaft are locked；When the electromagnet is powered, the safety pin compressed spring is close to the electricity Magnet movement, and disconnected with the groove, the eccentric shaft unlock.

5. the small teeth number difference planet gear active front steering system as described in claim 1,2 or 4, which is characterized in that further include:

First annular groove is arranged in inside one end that the hollow shaft is covered far from the gear ring, is provided on first annular groove First circlip, for eccentric shaft described in axial restraint；

Second annular groove is arranged in outside the hollow shaft between first annular groove and gear ring set, second ring The second circlip is provided on slot, for second gear described in axial restraint.

6. small teeth number difference planet gear active front steering system as claimed in claim 4, which is characterized in that further include:

First shell；

Second shell is detachably connected with first shell；

Electromagnetism can is fixed in the first shell, and the electromagnet is fixed on the electromagnetism can；

Hollow connecting shaft is stretched out along output shaft disk one end center, for being fixedly connected with the automobile steering device；

Wherein, first input shaft both ends are rotatably supported at respectively in the first shell and second shell；Described second Input shaft one end is rotatably supported in the first shell；Described eccentric shaft one end is rotatably supported at the first shell On, the other end is rotatably supported in the hollow shaft, and the hollow shaft is rotatably supported in the second shell；The sky Heart connecting shaft is rotatably supported in the second shell.

7. small teeth number difference planet gear active front steering system as claimed in claim 6, which is characterized in that further include:

Rotary valve is fixedly connected with the hollow connecting shaft；

Diverter comprising turn to pinion gear and steering rack, the steering pinion gear upper end and the output end of the rotary valve are solid Fixed connection；

Steering gear housing, the steering rack are arranged in the steering gear housing, the steering pinion gear lower end and the steering tooth Item engaged transmission, and can be axially moved along the steering gear housing；

Hydraulic cylinder, one end are fixedly connected with described steering gear housing one end；

Wherein, piston rod is equipped in the hydraulic cylinder, described piston rod one end is fixedly connected with described steering rack one end, separately One end is connect with the first drag link, and the other end of the steering rack is connected with the second drag link；

First dust cover is set on the hydraulic cylinder, and the other end of one end and the hydraulic cylinder is tightly connected, the other end with It is tightly connected at the end variable diameter of the piston rod；

Second dust cover is set on the steering gear housing, and the other end of one end and the steering gear housing is tightly connected, another It is tightly connected at end and the end variable diameter of the rack gear.

8. small teeth number difference planet gear active front steering system as claimed in claim 5, which is characterized in that further include:

Steering shaft, one end are fixedly connected with the vehicle steering wheel；

Steering drive axle, one end are connect by the first universal joint with the other end of the steering shaft, and the other end passes through the 20000th First input axis connection described in Xiang Jieyu.