CN206813091U - Sideshake mechanism is determined in electric power-assisted steering apparatus self compensation - Google Patents

Abstract

It the utility model is related to a kind of electric power-assisted steering apparatus self compensation and determine sideshake mechanism, be respectively equipped with the endoporus of three different directions on housing, by bearings worm gear mandrel wherein in main aperture, coaxial cooperation worm gear in worm gear mandrel；Inclined hole is provided with the top of main aperture, the axis of inclined hole and the axis of main aperture are in spatially the alternate angle of non-90 degree, and worm screw, worm and wheel engagement are coaxially disposed in inclined hole；One end of wherein worm screw is supported by deep groove ball bearing, and the other end passes through joint ball bearings；Cross-drilled hole is provided with above the end of inclined hole, the axis of cross-drilled hole is vertical with inclined hole axis and axis with main aperture be in non-90 degree alternate angle, and cross-drilled hole center and deep groove ball bearing position correspondence, adjustment plug screw assembly is provided with cross-drilled hole, bearing adjustment is provided between deep groove ball bearing and adjustment plug screw assembly.This mechanism can lift the stationarity of electric power-assisted steering apparatus work, while solve caused abnormal sound noise problem in work.

Description

Sideshake mechanism is determined in electric power-assisted steering apparatus self compensation

Technical field

It the utility model is related to a kind of electric power-assisted steering apparatus self compensation and determine sideshake mechanism, it is electric boosted for being lifted The stationarity of transfer work simultaneously reduces the mechanism of work noise, belongs to a kind of auto parts and components.

Background technology

For electric power-assisted steering apparatus with its superior performance, the outstanding advantage of energy-saving and environmental protection turns into the head of wheel steering system Choosing, and the necessary devices of intelligent driving technology development.

The stationarity and low noise of work are evaluation electric power-assisted steering apparatus technology, two important fingers of quality level Mark, worm gear and worm screw are the core mechanical components of electric power-assisted steering apparatus, and its teeth portion meshing quality directly affects two above Index is reached, and the size of teeth portion joggleword sideshake is to influence the key of meshing quality, and sideshake is small, and the work of device is put down Stability declines, and sideshake is big, and the teeth portion meshing noise of device is high.

The worm gear of traditional electric power-assisted steering apparatus and worm screw, which are taken, to center away from mounting means, low to reach teeth portion engagement Noise objective, need to match the less worm gear of work sideshake and worm screw assembling, and small work sideshake can not overcome parts manufacture, assembling The influence of error and environmental change factor, electric power-assisted steering apparatus work smoothness are caused to be deteriorated.The abrasion companion of meshing teeth Increase with the increase of VMT Vehicle-Miles of Travel, abrasion causes work sideshake bigger than normal and raises teeth portion meshing noise.Thus tradition Design structure can not meet work smoothness and the index of low noise, the noise problem of electric power-assisted steering apparatus becomes state The inside and outside emphasis and difficulties for turning to industry.Subject matter existing for traditional electric power-assisted steering apparatus is as follows：

Worm gear is the helical teeth cylinder worm gear of anchor ring tooth top, and matched reference diameter of worm is smaller, thus can not Carry out machining worm wheel teeth portion by worm screw size manufacture hobboing cutter, large diameter disc cutter machining worm wheel teeth portion can only be used, cause worm gear and snail The mesh tooth face of bar into a working condition for contact, because working flank contact stress is excessive, makes tooth surface abrasion speed in theory It hurry up.The abrasion of working flank continues to increase teeth portion meshing backlass, and sideshake increase makes working flank bear the impact of active force Increase, can be further exacerbated by tooth surface abrasion, so circulation, not only seriously reduce the quality of teeth portion engagement, and make electronic help The work noise of power transfer continues to increase, while brings potential safety hazard and driver is not received.

Worm gear and worm screw be separately mounted to spatially in 90 ゜ alternate angles and for center away from housing on, worm screw is without moving back The normal cylindrical worm gear of cutter groove structure, supported by two light-duty deep groove ball bearings installed in both ends.The tooth of worm gear circular arc Slot structure determines that transverse tooth thickness is minimum on reference circle at mid-plane, housing center away from structures shape only worm gear tooth part Interference gets to the preferable position of engagement at mid-plane by worm screw teeth groove, and interference installation can cause to be in contact teeth portion forever Deformation long or the decline of precision, make the stationarity that teeth portion engages reduce and increase meshing noise.

Due to parts manufacture, the presence of rigging error, worm gear and worm screw can not be accurately controlled preferable middle flat It is meshed at face, the incorrect decline for further resulting in teeth portion meshing quality of the position of engagement.

Accessory size produces the natural quality that corresponding change is material, engineering plastics with the difference of climatic environment condition Influence of the heat expansion and swelling character of worm gear manufactured by material to size becomes apparent, and traditional structure mode can not be to environmental change Influence make and making up accordingly, in different operating environment, worm gear and worm screw teeth portion meshing quality have a greater change, and cause The stability change of electric power-assisted steering apparatus work is excessive.

Casing center away from manufacture be deteriorated that there is worm gear and the meshing quality of worm screw and directly affect, not only need by unlimited The lifting worm gear of degree and the accuracy of manufacture of worm screw teeth portion reduce assembly center away from influence caused by change, are also needed before installation pair Casing center away from worm gear, worm screw assembling centre-to-centre spacing carry out preliminary examination, take with gather centre-to-centre spacing mounting means assembling, cause to fill Cumbersome with process, efficiency is low, while reduces the versatility of parts, raises maintenance cost.

In traditional structure, the clearance of worm gear and the light-duty deep groove ball bearing of worm screw, the deficiency generation of parts rigidity are supported Additional work sideshake, combined influence of the motor output end with worm screw using unfavorable factors such as rigid connections, is helped electronic Reaching for power transfer two above index also produces certain negative effect, only invents rational structure, the skill of innovation Art, good system matches could fundamentally solve the problems, such as existing.

The content of the invention

The present invention provides a kind of electric power-assisted steering apparatus self compensation and determines sideshake mechanism, and this mechanism can lift electronic help The stationarity of power transfer work, while solve caused abnormal sound noise problem in work.

To solve problem above, concrete technical scheme of the present utility model is as follows：A kind of electric power-assisted steering apparatus is used certainly Sideshake mechanism is determined in compensation, and the endoporus of three different directions is respectively equipped with housing, wherein passes through medium-sized deep-groove ball axle in main aperture Hold and be installed on the light-duty deep groove ball bearing support worm gear mandrel in bearings set, coaxial cooperation worm gear in worm gear mandrel； The top of main aperture is provided with inclined hole, and the axis of inclined hole and the axis of main aperture are in spatially the alternate angle of non-90 degree, same in inclined hole Axle sets worm screw, worm and wheel engagement；One end of wherein worm screw is supported by deep groove ball bearing, and the other end passes through joint ball axle Support is held, worm screw outer end is interference fitted after stretching out joint ball bearing with tooth form half a coupler；Horizontal stroke is provided with above the end of inclined hole Hole, the axis of cross-drilled hole is vertical with inclined hole axis, and cross-drilled hole center and deep groove ball bearing position correspondence, is provided with and adjusts in cross-drilled hole Whole plug screw assembly, bearing adjustment is provided between deep groove ball bearing and adjustment plug screw assembly.

Described bearing adjustment is the bearing positioning seat positioned at adjustment plug screw assembly lower surface, bearing positioning seat and horizontal stroke Hole is coaxially disposed, and double-arc surface is provided with the lower end of bearing positioning seat, and each arc surface RA Central Symmetries of double-arc surface are distributed, Arc surface is supported on the outer ring of deep groove ball bearing, and arc surface the RA center of circle and the deep groove ball bearing outer ring RB centers of circle have offset A and b.

Described bearing adjustment is by the bearing outside coaxially set gradually with deep groove ball bearing outer ring and fixed set group Into；Wherein the outline of bearing outside is rectangle, and the end position of two side planes respectively has a rectangle boss, and upper surface is provided with One rectangular boss, inner wall surface corresponding with two side planes are provided with axial arc gap；Fixed cover outer cylinder both sides are set respectively There are two symmetrical flats, have the double wedge that a cross section is triangle in flat plane, the outside circle of triangle double wedge is small In cylindrical column diameter, there is a through hole outside cylinder end face center position, and fixed cover Internal periphery is rectangle, is set on the side plane of inwall two There is a plurality of axial groove, the endface position of both sides plane axial direction is respectively provided with a rectangular v notch v；Wherein bearing outside and fixation Coaxial cooperation, side of the fixed cover with axial groove and side plane interference fits of the bearing outside with rectangle boss are covered, The rectangular v notch v of fixed cover is relative with the rectangle lug boss position of bearing outside, the top surface through hole of fixed cover and bearing outside Rectangular boss position is relative.

Described adjustment plug screw assembly structure is that the upper compensating plate fastened and lower compensating plate are provided with adjustment plug screw with Contact surface between compensating plate is helical annular inclined-plane, passes through the ditch on inclined-plane at the axle center between upper compensating plate and lower compensating plate The torque arm of groove positioning cylinder helical torsion spring；The bottom surface connection positioning seat of lower compensating plate, positioning seat outer face are provided with groove cavity, dish One end of spring contacts with groove cavity bottom surface, and the other end contacts with sliding shim, and it is fixed that sliding shim is positioned at by fixed back-up ring On the seat of position.

Described adjustment plug screw assembly structure is that the upper compensating plate fastened and lower compensating plate are provided with adjustment plug screw, on Contact surface between compensating plate and lower compensating plate is helical annular inclined-plane, is passed through at the axle center between upper compensating plate and lower compensating plate The torque arm of groove positioning cylinder helical torsion spring on inclined-plane；The bottom surface connecting positioning sleeve of lower compensating plate, positioning sleeve intracavitary are provided with dish Shape spring, one end of disk spring contact with positioning sleeve inner chamber top surface, the other end and the cylindrical end contact of sliding bar ladder, sliding Lever is positioned on positioning sleeve by fixed back-up ring, and the cylindrical bar at sliding bar center passes through the top surface of fixed back-up ring and fixed cover to lead to Hole, the end face of cylindrical bar are in contact with the rectangular boss end face of bearing outside.

The endoporus of described housing main aperture is provided with annular groove, and annular groove is provided with circlip for hole, the side of circlip for hole Surface excircle is provided with chamfering inclined-plane, and chamfering inclined-plane is engaged with housing annular groove end face for the chamfering inclined-plane with angle, hole bullet Property back-up ring another side surface compress the outer ring of medium-sized deep groove ball bearing.

Described worm gear is spelled casting by the metal core wheel and outside engineering plastics of inside and formed, and the external cylindrical surface of worm gear is gradually Burst at the seams straight-tooth, and transverse tooth thickness is more than space width on reference circle.

Described worm screw manufactures for steel material, is normal direction straight tooth profile multi-head cylinder worm screw, the helical tooth of worm screw uses nothing Relief groove structure.

The driving cog cross section of described tooth form half a coupler is the straight-tooth of isosceles trapezoid, and transverse tooth thickness is small on driving cog reference circle In space width, tooth end has a spacing shoulder, tooth form half a coupler be coaxially interference fitted in worm end it is cylindrical on；Synchronous gear Shape set is manufactured using rubber-plastics material, and the internal tensile layer for being provided with cordage or high-strength engineering plastic, synchronizing jugged set it is interior Hole double wedge is corresponding with the teeth groove of tooth form half a coupler, coaxially connected with the teeth groove interference fit of tooth form half a coupler.

Described joint ball bearing is formed by deep groove ball bearing and oscillating bearing coaxial cooperation；Wherein deep groove ball bearing is outer Enclose and be structure as a whole with the inner ring of oscillating bearing, it is axially incomplete to be provided with a plurality of circumference uniform distribution in the outer ring Internal Spherical Surface of oscillating bearing The groove of insertion.

Electric power-assisted steering apparatus self compensation is determined sideshake mechanism and engaged using worm gear with worm screw teeth portion, and passes through bearing Adjusting apparatus and adjustment plug screw assembly coordinate control worm gear and the maximum functional sideshake of worm screw, make electric power-assisted steering apparatus low noise Sound stationarity is run.Housing is the matrix of each parts installation, and its inclined hole and main aperture are in spatially the alternate angle of non-90 degree, its Angle value is the complementary angle of the angle of spiral on pitch circle of worm, and bearing adjustment promotes worm screw to swing, makes worm screw teeth portion along snail Wheel teeth portion has displacement feeding axially and radially simultaneously, and this feeding mode increases work than single radial displacement feeding mode Make effective work area of teeth portion, thus can greatly reduce the speed of worm gear tooth part abrasion, lift the service life of worm gear.

Bearing adjustment uses single part bearing positioning seat, passes through the eccentric bicircular arcs symmetric support of bearing positioning seat Deep groove ball bearing outer ring, contact center line and the axis angle of circular arc are acute angle, and eccentric bicircular arcs structure can ensure that bearing is determined Position seat is in two contact line holding states all the time with deep groove ball bearing outer ring, realizes that deep groove ball bearing is in bearing positioning seat The purpose of heart position work；Bicircular arcs structure plays a part of constraining worm screw to any direction swing, makes worm screw can only be along horizontal stroke Axially bored line direction and swing.

Bearing adjustment using two part composite construction forms the combination of bearing outside and fixed cover, in bearing outside Deep groove ball bearing is uniformly wrapped up in hole, avoids bearing local deformation from lifting bearing load carrying capacity and service life；Bearing outside is only It can play a part of constraining worm screw along the both sides planar slide of fixed cover inwall to any direction swing, make worm screw can only be along axle Hold overcoat moving direction and swing, while its structure type can reduce the skid force of worm screw swing；Bearing outside and fixed cover Structure type has variation rigidity, plays to worm screw while has vibration damping and rigid support effect concurrently.

Adjustment plug screw assembly is using displacement of the sliding shim in positioning seat axial direction, it is possible to controls worm gear and worm screw to nibble Close the maximum functional sideshake of teeth portion；Upper compensating plate and lower compensating plate are driven along contact spiral by cylindrical screw torsion spring elastic torque The direction that inclined-plane rises rotates coaxially, and worm gear and worm engaging teeth portion is made up because adding sideshake caused by abrasion, so as to ensure Worm gear and worm screw maximum functional sideshake it is constant.Sliding shim is fixed using positioning seat, the height of adjustment plug screw assembly can be made Degree, which diminishes, saves installing space；Sliding shim is positioned using positioning sleeve, increases the height of adjustment plug screw assembly, while be sliding bar Stretch out certain length.

Described circlip for hole is used for the axial restraint for supporting the medium-sized deep groove ball bearing of worm gear, circlip for hole The excircle of one side end face is provided with chamfering inclined-plane, and chamfering inclined-plane is engaged with housing annular groove chamfering inclined-plane, circlip for hole footpath It is corresponding mobile that change to diameter causes the position of circlip for hole end face to occur, and the movement of end face can eliminate medium-sized zanjon Ball bearing is in the gap of shell inner hole axis direction.

Described worm gear is spelled casting by the metal core wheel and outside engineering plastics of inside and formed, and the outer surface of worm gear is gradually to open Line straight tooth profile, and transverse tooth thickness is more than space width on reference circle；Involute spur exterior feature is homogeneous along the upper transverse tooth thickness of tooth length direction arbitrary indexing circle Together, when worm gear tooth part in axial direction loads worm screw teeth groove, initial engagement state can be attached to using gap fiting mode, because of peace Dress process teeth portion reduces teeth portion precision problem, and make installation simple and direct and efficient without the stress that contacts with each other in the absence of because of installation.

Described worm screw is normal direction straight tooth profile multi-head cylinder worm screw, and its helical tooth is used without relief groove structure, steel material Manufacture, makes worm screw have higher rigidity；Worm screw both ends are applied to deep-groove ball axle by deep groove ball bearing and joint ball bearings The active force held can be such that worm screw is swung centered on the ball bearing of joint.

The isosceles trapezoid straight-tooth of described tooth form half a coupler outer surface is processed using cold-extrusion technology, the tooth on reference circle Thickness is less than space width, and tooth end is machined with spacing shoulder；Synchronizing jugged set is processed using rubber-plastic material, while is had concurrently good Intensity and flexibility.Endoporus circumference uniform distribution teeth groove corresponding with tooth form half a coupler double wedge, teeth groove are connected with double wedge interference.It is synchronous The flexibility of tooth profile sleeve can compensate radial displacement and the angle displacement of connected axle, and tensile layer is increased using cordage and engineering plastics By force torque capability is transmitted to lift it.

Described joint ball bearing is formed by deep groove ball bearing and oscillating bearing coaxial cooperation, and realizing worm screw can be axial Positioning, and can realize the function of swinging, and set groove in oscillating bearing inner ring, lubricant grease is transported into joint shaft by groove Hold at sphere, non-through part prevents from axially leaking with playing a part of seal grease at oscillating bearing inner ring spherical outside surface cooperation.

Brief description of the drawings

Fig. 1 is that the explosive view of sideshake mechanism embodiment one is determined in self compensation.

Fig. 2 is housing axonometric drawing.

Fig. 3 is that sectional view of the sideshake mechanism along housing inclined hole direction is determined in self compensation.

Fig. 4 is the axonometric drawing of circlip for hole.

Fig. 5-1 is bearing positioning seat axle surveys view.

Fig. 5-2 is the sectional view of bearing positioning seat.

Fig. 6 is the explosive view of adjustment plug screw assembly embodiment one.

Fig. 7 is upper compensation bobbin surveys view.

Fig. 8 is gag lever post axle surveys view.

Fig. 9 is that the explosive view of sideshake mechanism embodiment two is determined in electric power-assisted steering apparatus self compensation.

Figure 10 is fixed cover axle surveys view.

Figure 11 is bearing outside axonometric drawing.

Figure 12 is joint ball bearing explosive view.

Figure 13 is joint ball bearing sectional view.

Embodiment

Embodiment one

As shown in figure 1, sideshake mechanism is determined in a kind of self compensation of electric power-assisted steering apparatus, mainly by housing 1, worm gear 4, snail Bar 9 and adjustment plug screw assembly 30 form, as shown in Fig. 2 the endoporus of three different directions is respectively equipped with housing 1, such as Fig. 3 institutes Show, in the endoporus of the medium-sized coaxial press-in main aperture 31 of housing 1 of the outer ring of deep groove ball bearing 2 interference fit, endoporus shoulder and medium-sized zanjon The outer ring of ball bearing 2 contacts and axial limiting.Circlip for hole 3 is as shown in figure 4, its external diameter is coaxially mounted to the main aperture 31 of housing 1 Internal circular-grooves in, the chamfering inclined-plane 34 of circlip for hole 3 and shell inner hole annular groove end face are the chamfering inclined-plane phase with angle Coordinate, the other end of circlip for hole 3 compresses the outer ring of medium-sized deep groove ball bearing 2, and the mode that chamfering inclined-plane is engaged can To eliminate medium-sized deep groove ball bearing 2 in the gap in the endoporus axis direction of housing 1, make medium-sized deep groove ball bearing 2 in the main aperture of housing 1 31 axial Complete Binds.

Deep groove ball bearing 12 be coaxially mounted to worm screw 9 minor diameter it is cylindrical on, end ring 11 is arranged on the minor diameter of worm screw 9 In cylindrical annular groove, end ring 11 is fixed in annular groove by riveting method, the end face of end ring 11 compresses deep-groove ball axle 12 inner ring end face is held, makes 12 axial Complete Bind of deep groove ball bearing.

Joint ball bearing 10 as shown in Figure 12 and Figure 13, is formed by deep groove ball bearing 51 and the coaxial cooperation of oscillating bearing 52； The wherein outer ring of deep groove ball bearing 51 and the inner ring of oscillating bearing 52 is structure as a whole, and joint ball bearing 10 is coaxially mounted to worm screw On 9 major diameters are cylindrical, side and side phase of the worm screw with helical tooth in the outer ring Internal Spherical Surface of oscillating bearing 52 with groove 53 It is right, tooth form half a coupler 13 with interference connected mode be fitted in worm screw 9 stretching it is cylindrical on, the front end face of tooth form half a coupler 13 The inner ring end face of joint ball bearing 10 is compressed, trip bolt 14 is screwed in the internal thread hole of worm screw 9 and locked, before trip bolt 14 End face compresses the end face of the ladder endoporus of tooth form half a coupler 13, makes joint ball bearing 10 and tooth form half a coupler 13 in worm screw 9 Axis direction Complete Bind.

Worm screw 9 is coaxially fitted into the inclined hole 32 of housing 1, and the hole size that deep groove ball bearing 12 is assembled in housing 1 is more than deeply The outer ring size of ditch ball bearing 12, lock sleeve 16 is screwed in the internal thread hole of 1 inclined hole of housing 32 and locked, by outside joint ball bearing 10 Circle end face is pressed on the ladder hole end surface of the inclined hole 32 of housing 1.The teeth groove of synchronizing jugged set 15 is convex with tooth form half a coupler 13 Tooth alignment is co-axially mounted.

Light-duty deep groove ball bearing 7 be coaxially mounted to worm gear mandrel 5 it is cylindrical on, the endoporus of worm gear 4 passes through interference connection side Formula be coaxially fitted in worm gear mandrel 5 it is cylindrical on, worm gear end face compresses the shoulder of worm gear mandrel 5 and axial limiting.Bearings The endoporus of set 6 is with interference connected mode on the light-duty outer ring of deep groove ball bearing 7.Moldeed depth during the front end face of worm gear mandrel 5 stretches out The endoporus of ditch ball bearing 2, worm gear 4 is fitted into the main aperture 31 of housing 1, the teeth portion position of adjustment worm gear 4 and worm screw 9 is allowed in just Beginning engagement, hex nut 8 screw in the external screw thread of worm gear mandrel 5 and locking, worm gear 4 are pressed on into medium-sized deep groove ball bearing 2 Inner ring end face on and axial Complete Bind.

Bearing positioning seat 26 loads housing 1 as shown in Fig. 5-1 and Fig. 5-2, by bearing positioning seat 26 with gap fiting mode In 33 corresponding endoporus of cross-drilled hole, the arc surface RA center of circle and the offset in the outer ring RB centers of circle of deep groove ball bearing 12 are a and b, zanjon The outer ring of ball bearing 12 and the contact center of the double-arc surface 35 of bearing positioning seat are at an angle, and two arc surfaces are in a manner of axial symmetry Support deep groove ball bearing 12.

The structure of adjustment plug screw assembly 30 is as shown in fig. 6, the endoporus of disk spring 19 and sliding shim 18 is coordinated with gap Mode is coaxially mounted on the big cylinder of positioning seat 20, and retaining washer 17 is sleeved on the small column of positioning seat 20, riveting roundlet Styletable face is allowed to be plastically deformed, and caused flanging fixes retaining washer 17, and the both ends of the surface of disk spring 19 are pressed respectively Tightly on the end face of sliding shim 18 and the annular groove bottom surface of positioning seat 20.The upper surface of retaining washer 17 to the lower surface of positioning seat 20 Axial distance be more than the thickness of sliding shim 18 and produce certain gap value, sliding shim 18 can scope interior axle in this gap To sliding.

Upper compensating plate is as shown in fig. 7, there is circumferentially trisection and with identical on lower compensating plate 21 and upper compensating plate 23 Three annular slopes of spiral height, cylindrical screw torsion spring 22 are installed on compensating plate 23 and the ring at the middle part of lower compensating plate 21 In groove 36, while the torque arm at the both ends of cylindrical screw torsion spring 22 is respectively charged into the groove 37 of compensating plate 23 and lower compensating plate 21, Upper compensating plate 21 and lower compensating plate 23 are interlocked, overcome the elastic torque of cylindrical screw torsion spring 22, makes compensating plate 23 with The flat recess that compensating plate 21 relatively rotates to centre position aligns.

As shown in figure 8, in the flat recess that two flats 38 insertion of gag lever post 27 aligns, flat 38 plays gag lever post 27 Circumference position-limiting action, make compensating plate 23 and the circumference geo-stationary of lower compensating plate 21.

Bonding agent is uniformly applied on the end face inner bore wall of lower compensating plate 21, under the coaxial loading of round platform of the end face of positioning seat 20 In the endoporus of compensating plate 21, two parts are bonded as one, are fitted into element coaxial in the macropore of adjustment plug screw 24 afterwards.

Screw in the screw thread of the cross-drilled hole 33 of housing 1 and lock after the external threaded surface coated thread fastening glue of adjustment plug screw 24, As the angle rotary certain angle shown in the end face circumference groove of adjustment plug screw 24, gag lever post 27 is taken out, sideshake mechanism is determined in self compensation In original operating state, seal rubber plug 25 is fitted into the aperture of adjustment plug screw 24.

When electric power-assisted steering apparatus works, motor output torque is made up of synchronizing jugged set and tooth form half a coupler Flexible coupling sends worm screw to, and torque is converted into the torque of driving load worm gear wheel by the teeth portion that is meshed by worm screw. Act on the load of meshing teeth make worm screw bear axially, tangentially and radially three component, joint ball loading ability of bearing axial thrust load, The deep groove ball bearing carrying tangential component of the bicircular arcs of joint ball bearing and bearing positioning seat support, realizes worm screw in axial direction and cuts To Complete Bind.Radial component is acted on disk spring by deep groove ball bearing, bearing positioning seat, sliding shim, when When radial component is less than the elastic force of disk spring, worm screw in radial direction by Complete Bind, in the presence of disk spring elastic force Worm screw teeth portion is set to be in close contact with worm gear teeth groove and realize teeth portion open top container ship.When radial component is more than the elasticity of disk spring During power, worm screw is swung centered on the ball bearing of joint to housing cross-drilled hole axis direction, is moved after bearing positioning seat and is promoted sliding shim Moved to the direction for compressing disk spring, the movable distance of sliding shim is not more than the maximum of mobile range set in advance Value.The size of the displacement control worm screw pivot angle of sliding shim, the size and snail of worm gear and worm screw teeth portion joggleword sideshake The size of bar pivot angle is directly proportional, so sliding shim is axially movable to reach control teeth portion apart from can by presetting Engage maximum functional sideshake purpose.When radial component disappearance or the elastic force less than disk spring, worm screw teeth portion and worm-gear toothing Groove returns to the open top container ship state of close contact.

When worm gear and worm engaging teeth portion produce abrasion, bearing positioning seat end face to the thrust of sliding shim end face just It can reduce or disappear, the elasticity of now cylindrical screw torsion spring storage can be such that compensating plate and lower compensating plate coaxially relatively rotates, upper, The total height of lower compensating plate increases with the increase of corner, and height increase makes bearing positioning seat compress sliding shim again, upper and lower Compensating plate stops relatively rotating, and total height is not further added by, and the increased height of institute compensate for because meshing teeth abrasion institute can be increased Additional sideshake, so the abrasion of meshing teeth can't cause the increase of maximum functional sideshake, is realized by automatic compensation function Worm gear and the constant purpose of worm screw teeth portion engagement maximum functional sideshake.

When meshing teeth is worn, the increase of upper and lower compensating plate total height changes bearing positioning seat in housing cross-drilled hole Initialization position, bearing positioning seat promote worm screw its teeth portion is axially and radially being fed necessarily simultaneously along worm gear tooth part Displacement, this mode add effective work area of work teeth portion than the feeding mode of single radial displacement, reduce snail Take turns the rate of wear of teeth portion.

When the wear extent of worm gear and worm screw teeth portion reaches the limit values, deep groove ball bearing outer ring is reserved with corresponding shell inner hole Gap value disappear, deep groove ball bearing outer ring is in contact with inner walls, and the compensation function of abrasion no longer works, and avoids the super longevity Order the electric power-assisted steering apparatus used and produce potential safety hazard because of meshing teeth excessive wear.

Embodiment two

The present embodiment is as shown in figure 9, the bearing adjustment alternate embodiment formed with fixed cover 39 and bearing outside 40 Bearing adjustment in one（That is bearing positioning seat 26）, the structure of adjustment plug screw assembly 30 progress local directed complete set, the inclined hole 32 of housing 1 In interior hole end surface through hole is changed into from the blind hole of embodiment one, blocked with installation plastics and 46 carry out through hole sealing, remaining structure and Embodiment one is identical.

Adjustment plug screw assembly 30, replace positioning seat 20 and sliding shim in embodiment one respectively with positioning sleeve and sliding bar 18, positioning sleeve outer wall Inner is turned over using riveting method and fastens back-up ring 17.

Fixed cover 39 with as shown in figure 11, is had axial groove 43 by such as Figure 10 respectively for fixed cover 39 and bearing outside 40 Side is co-axially mounted with the side that bearing outside 40 has rectangle boss 44 in a manner of interference fits, the rectangle of fixed cover 39 Breach 50 is relative with the position of rectangle boss 44 of bearing outside 40, and makes the top surface through hole 49 and bearing outside 40 of fixed cover 39 Rectangular boss 45 position it is relative.Fixed cover 39 is pressed into the inclined hole 32 of housing 1 with interference fit, the inclined hole 32 of housing 1 Middle ladder endoporus end face is spacing and makes the top surface through hole 49 of fixed cover 39 and the cross-drilled hole 33 of housing 1 coaxial.

Worm screw 9 is fitted into the inclined hole 32 of housing 1, and the outer ring of deep groove ball bearing 12 is loaded in a manner of interference fits in bearing outside 40 Kong Zhong, hole end surface reserves certain interval with the cycle surface of deep groove ball bearing 12 in bearing outside 40.On plastics blocking 46 is cylindrical Two prominent annulus are so that interference connected mode is pressed into the end face inner bore of housing 1 and realizes sealing function.

Adjustment plug screw assembly 30 is installed in the cross-drilled hole 33 of housing 1, and its mounting means is the same as embodiment one, the cylinder of sliding bar 42 End face is pressed on the end face of rectangular boss 45 of bearing outside 40 by the top surface through hole 49 of fixed cover 39.

The operation principle of embodiment two is consistent with the operation principle of embodiment one, simply in the control of maximum functional sideshake Difference in mode.Bearing outside can slide in two sides of fixed cover rectangle Internal periphery, the circle end face of sliding bar The rectangular boss end face of bearing outside, the displacement of sliding bar and the movement of bearing outside are compressed by fixed cover top surface through hole Apart from identical, pass through the control moved to sliding bar in the range of preset distance, it is possible to the size of worm screw pivot angle is controlled, Reach control teeth portion engagement maximum functional sideshake purpose.When the wear extent of meshing teeth reaches the limit values, outside bearing outside rectangle The bottom surface of profile is in contact with the bottom surface of fixed cover rectangle Internal periphery, and compensation function no longer works.

Claims (10)

1. sideshake mechanism is determined in a kind of self compensation of electric power-assisted steering apparatus, it is characterised in that：In housing（1）On be respectively equipped with three The endoporus of individual different directions, wherein main aperture（31）It is interior to pass through medium-sized deep groove ball bearing（2）Be installed on bearings set（6）Interior Light-duty deep groove ball bearing（7）Support worm gear mandrel（5）, worm gear mandrel（5）Upper coaxial cooperation worm gear（4）；Set above main aperture There is inclined hole（32）, the axis of inclined hole and the axis of main aperture are spatially in the alternate angle of non-90 degree, in inclined hole（32）It is interior coaxially to set Put worm screw（9）, worm screw（9）With worm gear（4）Engagement；Wherein worm screw（9）One end pass through deep groove ball bearing（12）Support, the other end Pass through joint ball bearing（10）Support, worm screw（9）Joint ball bearing is stretched out in outer end（10）Afterwards with tooth form half a coupler（13）Interference Coordinate；In inclined hole（32）End above be provided with cross-drilled hole（33）, cross-drilled hole（33）Axis and inclined hole（32）Axis is vertical, and cross-drilled hole （33）Center and deep groove ball bearing（12）Position correspondence, in cross-drilled hole（33）It is interior to be provided with adjustment plug screw assembly（30）, in zanjon Ball bearing（12）With adjustment plug screw assembly（30）Between be provided with bearing adjustment.

2. sideshake mechanism is determined in electric power-assisted steering apparatus as claimed in claim 1 self compensation, it is characterised in that：Described axle It is positioned at adjustment plug screw assembly to hold adjusting apparatus（30）The bearing positioning seat of lower surface（26）, bearing positioning seat（26）With cross-drilled hole （33）It is coaxially disposed, in bearing positioning seat（26）Lower end be provided with double-arc surface（35）, double-arc surface（35）Each arc surface RA Central Symmetries are distributed, and arc surface is supported on deep groove ball bearing（12）Outer ring on, the arc surface RA center of circle and deep groove ball bearing （12）The outer ring RB centers of circle have offset a and b.

3. sideshake mechanism is determined in electric power-assisted steering apparatus as claimed in claim 1 self compensation, it is characterised in that：Described axle Hold adjusting apparatus by with deep groove ball bearing（12）The bearing outside that outer ring is coaxially set gradually（40）And fixed cover（39）Composition；Its Middle (center) bearing overcoat（40）Outline be rectangle, the end position of two side planes respectively has a rectangle boss（44）, upper surface Provided with a rectangular boss（45）, inner wall surface corresponding with two side planes is provided with axial arc gap（47）；Fixed cover（39） Outer cylinder both sides are respectively equipped with two symmetrical flats, there is the double wedge that a cross section is triangle in flat plane（48）, The outside circle of triangle double wedge is less than cylindrical column diameter, and there is a through hole outside cylinder end face center position（49）, fixed cover（39） Internal periphery is rectangle, and the side plane of inwall two is provided with a plurality of axial groove（43）, both sides plane axial direction endface position be respectively provided with One rectangular v notch v（50）；Wherein bearing outside（40）With fixed cover（39）Coaxial cooperation, fixed cover（39）With axial ditch The side of groove and bearing outside（40）With rectangle boss（44）Side plane interference fits, fixed cover（39）Rectangle lack Mouthful（50）With bearing outside（40）Rectangle boss（44）Position is relative, fixed cover（39）Top surface through hole（49）With outside bearing Set（40）Rectangular boss（45）Position is relative.

4. sideshake mechanism is determined in electric power-assisted steering apparatus as claimed in claim 2 self compensation, it is characterised in that：Described tune Whole plug screw assembly（30）Structure is, in adjustment plug screw（24）It is interior to be provided with the upper compensating plate fastened（23）With lower compensating plate（21) on, Compensating plate（23）With lower compensating plate（21）Between contact surface be helical annular inclined-plane, upper compensating plate（23）With lower compensating plate（21） Between axle center at pass through the groove positioning cylinder helical torsion spring on inclined-plane（22）Torque arm；Lower compensating plate（21）Bottom surface connection Positioning seat（20）, positioning seat（20）Outer face is provided with groove cavity, disk spring（19）One end contacted with groove cavity bottom surface, it is another End and sliding shim（18）Contact, sliding shim（18）Pass through fixed back-up ring（17）It is positioned at positioning seat（20）On.

5. sideshake mechanism is determined in electric power-assisted steering apparatus as claimed in claim 3 self compensation, it is characterised in that：Described tune Whole plug screw assembly（30）Structure is, in adjustment plug screw（24）It is interior to be provided with the upper compensating plate fastened（23）With lower compensating plate（21）, on Compensating plate（23）With lower compensating plate（21）Between contact surface be helical annular inclined-plane, upper compensating plate（23）With lower compensating plate（21） Between axle center at pass through the groove positioning cylinder helical torsion spring on inclined-plane（22）Torque arm；Lower compensating plate（21）Bottom surface connection Positioning sleeve, positioning sleeve intracavitary are provided with disk spring（19）, disk spring（19）One end contacted with positioning sleeve inner chamber top surface, it is another End and the cylindrical end contact of sliding bar ladder, sliding bar pass through fixed back-up ring（17）It is positioned on positioning sleeve, sliding bar center Cylindrical bar pass through fixed back-up ring（17）And fixed cover（39）Top surface through hole（49）, the end face of cylindrical bar and bearing outside（40） Rectangular boss（45）End face is in contact.

6. sideshake mechanism is determined in electric power-assisted steering apparatus as claimed in claim 1 self compensation, it is characterised in that：Described shell Body（1）Main aperture（31）Endoporus be provided with annular groove, annular groove is provided with circlip for hole（3）, circlip for hole（3）A side surface Excircle is provided with chamfering inclined-plane（34）, chamfering inclined-plane（34）It is engaged with housing annular groove end face for the chamfering inclined-plane with angle, hole Use circlip（3）Another side surface compress medium-sized deep groove ball bearing（2）Outer ring.

7. sideshake mechanism is determined in electric power-assisted steering apparatus as claimed in claim 1 self compensation, it is characterised in that：Described snail Wheel（4）Casting is spelled by the metal core wheel and outside engineering plastics of inside to form, worm gear（4）External cylindrical surface be involute spur, And transverse tooth thickness is more than space width on reference circle.

8. sideshake mechanism is determined in electric power-assisted steering apparatus as claimed in claim 1 self compensation, it is characterised in that：Described snail Bar（9）Manufactured for steel material, be normal direction straight tooth profile multi-head cylinder worm screw, worm screw（9）Helical tooth use without relief groove structure.

9. sideshake mechanism is determined in electric power-assisted steering apparatus as claimed in claim 1 self compensation, it is characterised in that：Described tooth Shape half a coupler（13）Driving cog cross section be isosceles trapezoid straight-tooth, transverse tooth thickness is less than space width on driving cog reference circle, Tooth end has spacing shoulder, tooth form half a coupler（13）Coaxially it is interference fitted in worm screw（9）End it is cylindrical on；Synchronizing jugged set （15）Manufactured using rubber-plastics material, and the internal tensile layer for being provided with cordage or high-strength engineering plastic, synchronizing jugged set（15） Endoporus double wedge and tooth form half a coupler（13）Teeth groove it is corresponding, with tooth form half a coupler（13）Teeth groove interference fit coaxially connect Connect.

10. sideshake mechanism is determined in electric power-assisted steering apparatus as claimed in claim 1 self compensation, it is characterised in that：Described Joint ball bearing（10）By deep groove ball bearing（51）And oscillating bearing（52）Coaxial cooperation forms；Wherein deep groove ball bearing（51）'s Outer ring and oscillating bearing（52）Inner ring be structure as a whole, in oscillating bearing（52）Outer ring Internal Spherical Surface be provided with a plurality of circumference uniform distribution Axially not completely through groove（53）.