CN209051485U - Electric boosting steering system - Google Patents
Electric boosting steering system Download PDFInfo
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- CN209051485U CN209051485U CN201821470936.0U CN201821470936U CN209051485U CN 209051485 U CN209051485 U CN 209051485U CN 201821470936 U CN201821470936 U CN 201821470936U CN 209051485 U CN209051485 U CN 209051485U
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Abstract
The utility model discloses a kind of electric boosting steering systems, including turning machine shell, power-assisted gear, rack gear positioning device and the moveable rack gear for being set in turning machine shell and being meshed with power-assisted gear, rack gear positioning device includes in the first positioning mechanism that one end of rack gear positions rack gear, the second positioning mechanism positioned for the other end in rack gear to rack gear and third positioning mechanism for being positioned at the position between rack gear both ends to rack gear, third positioning mechanism to be between the first positioning mechanism and the second positioning mechanism.The electric boosting steering system of the utility model, it is matched by the first positioning mechanism of setting, the second positioning mechanism and third positioning mechanism, the variation of radial position and angle during rack work can be greatly reduced, improve rack gear locating effect, guarantee that engagement is good between rack gear and power-assisted gear, reach the stable effect of power-assisted effect, improves the comfort level of driver.
Description
Technical field
The utility model belongs to wheel steering system technical field, specifically, electronic helping the utility model relates to a kind of
Power steering system.
Background technique
Electric boosting steering system (Electric Power Steering System, EPS) is one kind directly by motor
The steering system of power-assisted is provided, controller is according to the collected speed of sensor and torque signal, to control the electricity of assist motor
Size and Orientation is flowed, to realize the purpose to vehicle steering wheel power-assisted.
Electric boosting steering system has accurate steering reversal；Power-assisted size can be adjusted according to the variation of speed, from
And directional stability when manipulation lightweight and high speed when can take into account low vehicle speeds；The consumption of reduction engine power,
Save fuel oil；There is no due to many advantages, such as being applicable in hydraulic oil pollution on the environment, meet the needs of social development, because
This electric boosting steering system is the main direction of development of automobile steering system.
The rack gear positioning method of existing electric boosting steering system is rack gear one end and bushing inner hole clearance fit, and rack gear is another
One end provides radial elastic by support base and limits, and in such location structure, the radially adjustable adjusting range of bushing positioning end is small, rack gear branch
The support radially adjustable adjusting range of seat positioning end is big, and the positioning method at rack gear both ends is different, and radial force is uneven, causes rack gear in axial direction
Biggish radial displacement is had while movement, causes bushing inner ring to be prone to wear, reduces the service life, and increases noise.
Rack support seat used at present, material are powder metallurgy, and rack support seat operative end surface withstands rack gear, another
Holddown spring is installed in the cylinder shape groove at end, is positioned with a shape for hat screw, shape for hat screw after the assembly is completed, need to adjust screw
Rigging position adjust the deformation quantity of holddown spring, and then the position of adjusting gear rack, process is cumbersome and is difficult to ensure product
Consistency.
Whole system is under larger external impacts or vibration, and in radial direction biggish change in location can occur for rack gear, together
When angle can have greatly changed, and then influence engaging for rack gear and power-assisted pinion gear and output shaft gear, influence driver
The power-assisted effect of feel and force aid system.
The rack gear of electric boosting steering system is the special gear that a kind of tooth is distributed on bar shape, can be divided into spur rack
And diagonal-cut rack, it is used respectively with straight spur gear and helical gears pairing, processing technology is usually tooth needed for purchasing
The bohler (surface-treated No. 45 very smooth steel) of diameter, cutting on gear shapping machine at carrying out flute profile after required length
Processing, after processing is completed, the edge of tooth is than sharp wedge angle.Rack gear is mounted in bushing, in the course of work, rack gear
With teeth section can enter bushing installation site, since the hardness of rack gear is far longer than the hardness of bushing, with teeth section of rack gear
It is easy to scratch bushing, reduces the service life of bushing.
Utility model content
The utility model aims to solve at least one of the technical problems existing in the prior art.For this purpose, the utility model mentions
For a kind of electric boosting steering system, it is therefore an objective to improve rack gear locating effect.
To achieve the goals above, the technical solution that the utility model is taken are as follows: electric boosting steering system, including turn to
Casing body, power-assisted gear, deceleration mechanism, rack gear positioning device and movably be set in turning machine shell and with power-assisted gear
The rack gear being meshed, the rack gear positioning device include the first positioning for being positioned in one end of the rack gear to rack gear
Mechanism, the second positioning mechanism that rack gear is positioned for the other end in rack gear and for the position between rack gear both ends
The third positioning mechanism that place positions rack gear, third positioning mechanism be located at the first positioning mechanism and the second positioning mechanism it
Between.
First positioning mechanism is the first bushing being set in the turning machine shell, and the first bushing is sheathed on rack gear
Upper and the first bushing and turning machine shell are interference fit, and the first bushing is located at the end of turning machine shell.
The rack gear is movably to be set in turning machine shell, and second positioning mechanism is to be set to steering casing
The second bushing in body, the second bushing is sheathed on rack gear and the second bushing and turning machine shell are interference fit, the second bushing
Positioned at the end of turning machine shell.
The third positioning mechanism includes rack support seat, holddown plate and is set to rack support seat and holddown plate
Between and the holddown spring for applying elastic acting force to rack support seat, the turning machine shell, which has, accommodates the rack gear
The accommodating cavity of support base, holddown plate are connect with turning machine shell.
The third positioning mechanism further includes the sealing ring being sheathed on the rack support seat, and sealing ring is in rack support
Axial arrangement on seat along rack support seat is one or more.
The rack gear includes with teeth section and anodontia section, and with teeth section is equipped with the multiple rack gears being meshed with the power-assisted gear
The both ends end face of tooth, the facewidth direction of rack tooth includes fillet surface and overmoving surface；First bushing is moved in rack tooth
When middle, there is gap between fillet surface and overmoving surface and the inner headed face of the first bushing；Second bushing is moved in rack tooth
When middle, there is gap between fillet surface and overmoving surface and the inner headed face of the second bushing.
For the fillet surface between the overmoving surface and the crest top land of the rack tooth, fillet surface and overmoving surface are flat
Angle between face and fillet surface and overmoving surface is obtuse angle.
The electric boosting steering system further includes the dust cover for being set to the both ends of the turning machine shell, turning machine
Shell, which has, makes the inner chamber body of dust cover and the inner chamber body of turning machine shell be in the air discharge duct of connected state.
The deceleration mechanism includes the worm and worm wheel being meshed, and is equipped in the turning machine shell for that will be coated on snail
It the first lubricant medium at worm and wheel and separates coated on the second lubricant medium at the power-assisted gear and the rack gear
Partition, partition is between the power-assisted gear and worm gear.
The worm gear is set on output shaft, and the partition has the through-hole for allowing output shaft to pass through, and the power-assisted gear is set
It is placed on gear shaft, is fixed in gear shaft insertion output shaft and between gear shaft and output shaft by positioning pin.
The electric boosting steering system of the utility model passes through the first positioning mechanism of setting, the second positioning mechanism and third
Positioning mechanism matches, and can greatly reduce the variation of radial position and angle during rack work, improves rack gear positioning effect
Fruit guarantees that engagement is good between rack gear and power-assisted gear, reaches the stable effect of power-assisted effect；The Caton for reducing steering wheel, mentions
The comfort level of high driver reduces noise and friction, extends the service life of electric boosting steering system.
Detailed description of the invention
This specification includes the following drawings, and shown content is respectively:
Fig. 1 is the structural schematic diagram of the utility model electric boosting steering system；
Fig. 2 is the structural schematic diagram of the first bushing and the second bushing；
Fig. 3 is the decomposition diagram of third positioning mechanism；
Fig. 4 is the cross-sectional view of third positioning mechanism；
Fig. 5 is the structural schematic diagram of rack support seat；
Fig. 6 is the structural schematic diagram of rack gear；
Fig. 7 is enlarged drawing at A in Fig. 6；
Fig. 8 is turning machine housing interior structure schematic diagram；
Fig. 9 is the cross-sectional view of the utility model electric boosting steering system；
In the figure, it is marked as 1, motor；2, deceleration mechanism；201, worm gear；202, worm screw；3, the first bushing；4, the second bushing；
5, third positioning mechanism；501, rack support seat；502, holddown spring；503, holddown plate；504, bolt；505, sealing ring；
506, accommodation groove；507, working face；508, spring installation cavity；6, output shaft；7, rack gear；701, anodontia section；702, rack tooth；
703, crest top land；704, fillet surface；705, overmoving surface；8, turning machine shell；801, air discharge duct；802, inner chamber body；9, dust cover；
10, torque sensor；11, input shaft；12, power-assisted gear；13, gear shaft；14, partition；15, outside link assembly；16, first is fixed
Position pin；17, the second positioning pin.
Specific embodiment
Below against attached drawing, by the description of the embodiment, making to specific embodiment of the present utility model further detailed
Thin explanation, it is therefore an objective to help those skilled in the art to the design of the utility model, technical solution have it is more complete, accurate and
Deep understanding, and facilitate its implementation.
It should be noted that " first ", " second " and " third " does not represent knot in embodiment disclosed below
Structure and/or absolute differentiation relationship functionally, do not represent the successive sequence that executes yet, and merely for convenience of description.
As shown in Figures 1 to 9, the utility model provides a kind of electric boosting steering system, including motor, steering casing
Body 8, power-assisted gear 12, deceleration mechanism, rack gear positioning device and movably be set in turning machine shell 8 and with power-assisted gear
12 rack gears being meshed.Rack gear positioning device include the first positioning mechanism for being positioned in one end of rack gear to rack gear,
Rack gear is positioned for the other end in rack gear the second positioning mechanism and at the position between rack gear both ends pairs
The third positioning mechanism that rack gear is positioned, third positioning mechanism is between the first positioning mechanism and the second positioning mechanism.
Specifically, as shown in figures 1 and 3, rack gear is movably to be set in the inner chamber body 802 of turning machine shell 8,
Turning machine shell 8 is the structure of both ends open and inner hollow, and the inner chamber body 802 of turning machine shell 8 is circular cavity and steering
The inner chamber body 802 of casing body 8 extends to the other end, tooth from one end of turning machine shell 8 for the length direction along turning machine shell 8
The diameter of item is less than the diameter of the inner chamber body 802.Deceleration mechanism is connect with motor 1 and power-assisted gear 12, and deceleration mechanism is used for will
The rotary force that motor 1 generates is transferred to power-assisted gear 12,12 drive rack of power-assisted gear in turning machine shell 8 along it is axial (
That is the length direction of turning machine shell 8) linear reciprocating motion is done, power-assisted gear 12 is located at the inside of turning machine shell 8, motor 1
Positioned at the outside of turning machine shell 8.One end on the length direction of turning machine shell 8 is arranged in first positioning mechanism, and second is fixed
Position mechanism is set to the other end on the length direction of turning machine shell 8, third positioning mechanism be set on turning machine shell 8 and
The position of third positioning mechanism is located between the both ends of turning machine shell 8, passes through the first positioning mechanism, the second positioning mechanism and
The cooperation of three positioning mechanisms can greatly reduce the variation of radial position and angle during rack work, improve rack gear positioning
Effect guarantees that engagement is good between rack gear and power-assisted gear 12, reaches the stable effect of power-assisted effect；Reduce the card of steering wheel
, the comfort level of driver is improved, noise and friction is reduced, extends the service life of electric boosting steering system.
As shown in Figure 1 to Figure 3, the first positioning mechanism is the first bushing 3 being set in turning machine shell 8, the first bushing 3
It is sheathed on rack gear.Preferably, the first bushing 3 is interference fit, easy for installation, the first bushing 3 with turning machine shell 8
In the end of turning machine shell 8.First bushing 3 is cirque structure, and the end of rack gear passes through the end of the first bushing 3 and rack gear
It extend out to the outside of turning machine shell 8.First bushing 3 is the inner chamber body 802 that turning machine shell 8 is mounted in a manner of press fitting
In, the fixation of bushing is realized in the outer wall of the first bushing 3 and the inner cavity of turning machine shell 8 by way of interference fit, rack gear
There is gap between periphery and the inner headed face of the first bushing 3 and the gap is smaller, pass through gap between rack gear and the first bushing 3
Positioning is realized in cooperation, and it is movable to guarantee that rack gear is radially only capable of within the scope of very small variable-angle.
As shown in Figure 1 to Figure 3, the second positioning mechanism is the second bushing 4 being set in turning machine shell 8, the second bushing 4
It is sheathed on rack gear.Preferably, the second bushing 4 is interference fit, easy for installation, the second bushing 4 with turning machine shell 8
In the end of turning machine shell 8, the first bushing 3 and the second bushing 4 are located at the opposite end of turning machine shell 8.First bushing, 3 He
The structure of second bushing 4 is identical, and the second bushing 4 is cirque structure, and the end of rack gear passes through the end of the second bushing 4 and rack gear
It extend out to the outside of turning machine shell 8.Second bushing 4 is the inner chamber body 802 that turning machine shell 8 is mounted in a manner of press fitting
In, the fixation of bushing is realized in the outer wall of the second bushing 4 and the inner cavity of turning machine shell 8 by way of interference fit, rack gear
There is gap between periphery and the inner headed face of the second bushing 4 and the gap is smaller, pass through gap between rack gear and the second bushing 4
Positioning is realized in cooperation, and it is movable to guarantee that rack gear is radially only capable of within the scope of very small variable-angle.
As shown in Figure 1, in the axial direction of turning machine shell 8, the first positioning mechanism, third positioning mechanism 5 and the second positioning
Mechanism is to be sequentially arranged, and third positioning mechanism 5 is between the first positioning mechanism and the second positioning mechanism and third positioning mechanism 5
The distance between first positioning mechanism is less than the distance between third positioning mechanism 5 and the second positioning mechanism, rack gear positioning dress
Set is to be realized respectively with the inner hole clearance fit of two bushings by rack gear both ends, and pass through the third positioning between two bushings
The radial displacement compensation that mechanism 5 is assisted, the resilient support that third positioning mechanism 5 is used to provide rack gear radially act on,
It gives rack gear corresponding angle change compensation, further decreases rack gear in the variation of radial position and angle, reduce bushing inner wall
Abrasion, reduce noise, prolong the service life.As shown in Figures 3 to 5, third positioning mechanism 5 includes rack support seat 501, pressure
It tight cover board 503 and is set between rack support seat 501 and holddown plate 503 and for applying bullet to rack support seat 501
The holddown spring 502 of property active force.Turning machine shell 8 has the accommodating cavity for accommodating rack support seat 501, which is circle
Cavity and accommodating cavity are that accommodating cavity, which is located at, to be turned to along the setting that extends radially through of turning machine shell 8 on the side wall of turning machine shell 8
Between the both ends of casing body 8, accommodating cavity is connected with the inner chamber body 802 of turning machine shell 8.Holddown plate 503, holddown spring
502, rack support seat 501 and rack gear are sequentially arranged for the axial direction along accommodating cavity, and rack support seat 501 is cylindrical body, rack gear branch
The overall diameter for supportting seat 501 is identical as the diameter of accommodating cavity, and rack support seat 501 is movably to be set to turning machine shell
In 8 accommodating cavity, holddown plate 503 is connect with turning machine shell 8 and holddown plate 503 and the holding of turning machine shell 8 are relatively solid
It is fixed.
As shown in Figures 3 to 5, elastic element is cylindrically coiled spring and is compressed spring, elastic element and rack support
Seat 501 is coaxial arrangement, and elastic element is clipped between holddown plate 503 and rack support seat 501, the both ends difference of elastic element
Holddown plate 503 and rack support seat 501 are contradicted, elastic element applies along axial pressure rack support seat 501, it is ensured that tooth
The back lash of wheel rack gear meets the requirements, and improves reliability.The overall diameter of elastic element is less than the outer straight of rack support seat 501
Diameter, rack support seat 501 have allow elastic element be embedded in spring installation cavity 508, the spring installation cavity 508 be circular cavity and
Spring installation cavity 508 be from the end face center for facing holddown plate 503 of rack support seat 501 along rack support seat
The diameter of the cavity that 501 internal recess for being axially facing rack support seat 501 is formed, the spring installation cavity 508 is slightly larger than bullet
Property element overall diameter, spring installation cavity 508 plays positioning action to elastic element, elastic element avoided to bend, and improves
Reliability and stability.
As shown in Figure 3 and Figure 4, holddown plate 503 is mounted on turning machine shell 8 by bolt 504, holddown plate 503
Positioned at the outside of turning machine shell 8, holddown plate 503 has the through-hole for allowing bolt 504 to pass through, and turning machine shell 8, which has, allows spiral shell
The internal thread hole that bolt 504 is embedded in.Preferably, holddown plate 503 is to be mounted on turning machine shell 8 by two bolts 504
On, the axis of bolt 504 is parallel with the axis of rack support seat 501, and two bolts 504 are with the axis of rack support seat 501
Line is that center line is uniformly distributed circumferentially, and the angle between two bolts 504 is 180 degree.Compress end cap and turning machine shell 8 it
Between it is fixed by two bolts 504, guarantee the elastic deformation having the same of holddown spring 502, it is not necessary to carry out holddown spring 502 again
Elastically-deformable debugging simplifies process route, better ensures that homogeneity of product.
As shown in Figures 3 to 5, third positioning mechanism 5 further includes the sealing ring 505 being sheathed on rack support seat 501, close
Seal 505 is clipped between rack support seat 501 and the inner wall of accommodating cavity.Sealing ring 505 is at least arranged one, works as sealing ring
When 505 settings are multiple, axial direction of multiple sealing rings 505 on rack support seat 501 along rack support seat 501 is sequentially arranged.Tooth
The periphery of support base 501 is equipped with the accommodation groove 506 for accommodating sealing ring 505, and accommodation groove 506 is in rack support seat 501
Periphery on along the annular groove entirely circumferentially extended, sealing ring 505 is O-ring.The setting of sealing ring 505 can avoid turning
Lubricant medium leakage into casing body 8.
As shown in Figures 3 to 5, in the present embodiment, sealing ring 505 is arranged two, and accommodation groove 506 is also provided with two, respectively
One sealing ring 505 is installed respectively in a accommodation groove 506.
As shown in Figures 3 to 5, rack support seat 501 has working face 507, which is arc surface, working face
507 are located at one end of rack support seat 501, and spring installation cavity 508 is located at the other end of rack support seat 501, working face 507 and
Rack gear is coaxial, and on rack support seat 501, one end where working face 507 forms the circular groove for allowing rack gear to be embedded in.Work
It is coated with polytetrafluoroethylene (PTFE) on face 507, forms coating on working face 507, the outer circle face contact of the coating and rack gear is resistance to improve
Mill property, prolongs the service life.Preferably, material used in rack support seat 501 is aluminium alloy, the big, weight with intensity
Light advantage.
As shown in Figure 6 and Figure 7, rack gear includes with teeth section and anodontia section 701, and with teeth section is equipped with and is meshed with power-assisted gear 12
Multiple rack tooths 702, with teeth section has certain length, and all rack tooths 702 are the length direction successively cloth along with teeth section
It sets and is to be equally spaced, rack tooth 702 is for being embedded in the tooth socket between the two neighboring gear teeth of power-assisted gear 12.It is anodontia
701 setting two and with teeth section of section is between two anodontia section 701, anodontia section of 701 not set rack tooths 702, and anodontia section 701
For the cylindrical body with certain length, two anodontia section 701 is coaxial arrangement, and anodontia section 701 of diameter is less than turning machine shell 8
Inner chamber body 802 diameter, electric boosting steering system be in back in state when, the first bushing 3 and the second bushing 4 are arranged respectively
In on one anodontia section 701.Rack tooth 702 has certain width, and the width direction of rack tooth 702 is mutually hung down with the axial of rack gear
Directly, interior diameter of the width of rack tooth 702 less than the first bushing 3 and the second bushing 4, the width of the first bushing 3 and the second bushing 4
Again smaller than the diameter of the inner chamber body 802 of turning machine shell 8.The both ends end face in the facewidth direction of rack tooth 702 includes fillet surface
704 and overmoving surface 705；When rack tooth 702 is moved in the first bushing, the fillet surface 704 and overmoving surface 705 of rack tooth 702
There is gap between the inner headed face of the first bushing；When rack tooth 702 is moved in the second bushing, fillet surface 704 and resigning
There is gap between face 705 and the inner headed face of the second bushing.In this way, can prevent rack gear from drawing in assembly and the course of work
Hurt the first bushing 3 and the second bushing 4, help to improve service life, and the first bushing 3 and the second bushing 4 are not easy to loosen,
High reliablity.
As shown in Figure 6 and Figure 7, fillet surface 704 is located between overmoving surface 705 and the crest top land 703 of rack tooth 702, chamfering
Face 704 and overmoving surface 705 are that the angle between plane and fillet surface 704 and overmoving surface 705 is obtuse angle.The tooth of rack tooth 702
Wide size is gradually reduced from the bottom of the tooth side of rack tooth 702 to tooth top side, and the surface at tooth top is crest top land 703, crest top land 703
For plane, crest top land 703 has certain length, and the length direction of crest top land 703 is equal with the width direction of rack tooth 702
Row, the length of crest top land 703 are less than the width of the bottom of the tooth side of rack tooth 702.The both ends end face in the facewidth direction of rack tooth 702 is equal
Including a fillet surface 704 and an overmoving surface 705, the end face of rack tooth 702 respectively held is by a fillet surface 704 and one
What a overmoving surface 705 formed, there are two fillet surface 704 and two overmoving surfaces 705, crest top land 703 to be located at two for tool altogether for rack tooth 702
Between a fillet surface 704, two V-shaped arrangements of fillet surface 704, two overmoving surfaces 705 also arrange by forming V-shape, two fillet surfaces 704
Be with two overmoving surfaces 705 it is symmetrical, angle between two fillet surfaces 704 is greater than between two overmoving surfaces 705
Angle.For two fillet surfaces 704, an end margin of one of fillet surface 704 is connect with an end margin of crest top land 703,
One end margin of another fillet surface 704 is connect with another end margin of crest top land 703, another end edge of two fillet surfaces 704
Edge is connect with the end edge for the overmoving surface 705 for being located at 702 the same end of rack tooth.
As illustrated in figures 1 and 8, the electric boosting steering system of the utility model further includes being set to turning machine shell 8
There is the inner chamber body 802 of the inner chamber body and turning machine shell 8 that make dust cover 9 to be in company for the dust cover 9 at both ends, turning machine shell 8
The air discharge duct 801 of logical state.The effect of dust cover 9 is primarily to prevent muddy water, sundries and dust from entering electric power steering
Internal system causes hard steering and failure, and dust cover 9 is for inner hollow and along axial telescopic structure, the material of dust cover 9
Matter is rubber.Dust cover 9 be arranged two, one end of each dust cover 9 respectively with one end on the length direction of turning machine shell 8
Portion is fixedly connected, and the other end of each dust cover 9 is connect with outside link assembly 15 respectively, dust cover 9 and outside link assembly 15 it
Between seal, rack gear is located between two outside link assemblies 15, and two outside link assemblies 15 of rack drives are moved, and two are dust-proof
Cover 9 and turning machine shell 8 constitute a closed space together, in this confined space, due to the first bushing 3 and the second bushing
It is interference fit between 4 and turning machine shell 8, therefore in order to which air can be circulated, exhaust is provided on turning machine shell 8
Slot 801, air discharge duct 801 is arranged two and two air discharge ducts 801 are located at one end on the length direction of turning machine shell 8,
Two air discharge ducts 801 are on the same straight line parallel with the length direction of turning machine shell 8, the length of two air discharge ducts 801
Spend size it is identical, two air discharge ducts 801 can make two dust covers 9 inner chamber body and turning machine shell 8 inner chamber body 802 always
In connected state.One of air discharge duct 801 and the first bushing 3 in two air discharge ducts 801 are located at the length of turning machine shell 8
One end on direction is spent, another air discharge duct 801 and the second bushing 4 are located at the other end on the length direction of turning machine shell 8,
The length of air discharge duct 801 is greater than the width (width direction of the first bushing 3 and the second bushing 4 of the first bushing 3 and the second bushing 4
It is parallel with the length direction of turning machine shell 8), the first bushing 3 and the second bushing 4 will not be completely covered by air discharge duct 801.
Air discharge duct 801 is configured in the manner described above, be it is most economical convenient, without the setting exhaust knot on bushing
Structure does not have to propose high requirement to the material and cost of the first bushing and the second bushing in this way, directly by turning machine shell
Upper setting air discharge duct 801, easy to process, at low cost, reliability is higher.
And in vehicle travel process, when steering wheel is beaten to a direction, since to will drive outside link total for the movement of rack gear
At the variation of 15 positions, and then cause the compression of side dust cover 9, the stretching of other side dust cover 9, if being not provided with air discharge duct
801, then the speed air flow in the dust cover 9 in compressive state is very slow, easily causes both ends air pressure imbalance, thus
Corresponding resistance is generated, the power-assisted effect of electric boosting steering system is influenced, therefore air discharge duct 801 need to be set, it is ensured that is electronic to help
Power steering system can work normally, and generate power-assisted effect.Air discharge duct 801 is the groove with certain length, air discharge duct 801
Length direction it is parallel with the length direction of turning machine shell 8, air discharge duct 801 be from the length direction of turning machine shell 8
End face start the inside that turning machine shell 8 is extended to along the length direction of turning machine shell 8, air discharge duct 801 is turning to casing
It is respectively formed an opening on the end face of body 8 and the inner headed face of turning machine shell 8, enables the inner chamber bodies of two dust covers 9
By the inner chamber body and two air discharge ducts 801 of turning machine shell 8802 always in the state being connected, in this way electric boosted
When steering system works, the air in two dust covers 9 can flow back and forth, realize the unimpeded of gas circuit, rapid when beating direction
It realizes the air pressure balance inside confined space, since air pressure inside unevenness causes resistance when avoiding beating direction, and influences power-assisted effect
Fruit.
As shown in Fig. 1 and Fig. 9, deceleration mechanism includes the worm screw 202 being meshed and worm gear 201, and worm screw 202 is rotatable
It is set in turning machine shell 8, worm screw 202 is fixedly connected with the motor shaft of motor 1, and worm gear 201 is set to turning machine shell 8
Inside is equipped in turning machine shell 8 for will be coated on worm screw 202 with the first lubricant medium at worm gear 201 and coated on helping
The partition 14 that the second lubricant medium at powershift gear 12 and rack gear separates, partition 14 between power-assisted gear 12 and worm gear 201,
Power-assisted gear 12 and worm gear 201 are coaxial arrangement.First lubricant medium be lubricant grease and be yellow lubricant grease, second profit
Sliding medium be lubricant grease and be black lubricant grease, the kind of the first lubricant medium and the second lubricant grease is different, if the
One lubricant medium and the second lubricant grease occur fusion will affect between worm gear 201 and worm screw 202, power-assisted gear 12 and rack gear it
Between lubricant effect, therefore partition 14 is set between power-assisted gear 12 and worm gear 201, partition 14 is by the first lubricant medium and the
Two lubricant greases separate in two independent spaces, and partition 14 can prevent the first lubricant medium from flowing to power-assisted gear 12 and tooth
Engagement place, partition 14 can also prevent the second lubricant medium from flowing to 202 engagement place of power-assisted worm gear 201 and worm screw, thus may be used
It is merged to avoid the first lubricant medium and the second lubricant grease, it is ensured that lubricant effect improves reliability.Partition 14 is round
The thickness of plate, partition 14 is smaller, and the material of partition 14 is 304 stainless steels, cheap, is not easy to get rusty and be not easy and two kinds of greases
It chemically reacts.Worm gear 201 is set on output shaft 6 and worm gear 201 and output shaft 6 are synchronous rotary, and output shaft 6 is both ends
The cylindrical body of opening and inner hollow, worm gear 201 is sheathed on output shaft 6 and worm gear 201 and output shaft 6 and partition 14 are coaxial
Setting, partition 14 are fixed at the inside of turning machine shell 8.Partition 14 has the through-hole for allowing output shaft 6 to pass through, which is
Through the circular hole of setting at the center of partition 14, the diameter of the through-hole is 1mm bigger than the overall diameter of output shaft 6, in partition 14
Gap between the inner headed face in heart hole and the periphery of output shaft 6 only has 0.5mm, will not influence the normal rotation of output shaft 6, together
When grease be also difficult to pass through, substitute the effect of rubber seal, and long service life.
As shown in Fig. 1 and Fig. 9, power-assisted gear 12 is roller gear, and power-assisted gear 12 is set on gear shaft 13, gear shaft
It is in 13 insertion output shafts 6 and fixed by the first positioning pin 16 between gear shaft 13 and output shaft 6.Gear shaft 13 is rotatable
It is set on turning machine shell 8, power-assisted gear 12 is to be fixedly and coaxially connected with gear shaft 13, and gear shaft 13 is cylindrical body, gear
Axis 13 and output shaft 6 are coaxial arrangement and the two synchronous rotary, and worm gear 201 drives power-assisted tooth by output shaft 6 and gear shaft 13
Take turns 12 synchronous rotaries.First positioning pin 16 is cylindrical body, and gear shaft 13 has the first avoid holes for allowing the first positioning pin 16 to pass through,
First avoid holes are the through-hole that setting is extended radially through on gear shaft 13 and the first avoid holes are circular hole, and output shaft 6, which has, to be allowed
The first pin hole that first positioning pin 16 passes through, the first pin hole are the through-hole and the first pin that setting is extended radially through on output shaft 6
Hole is circular hole.First positioning pin 16 is inserted into the first pin hole and the first avoid holes simultaneously, realizes the phase of gear shaft 13 and output shaft 6
To fixation, output shaft 6 is able to drive 13 synchronous rotary of gear shaft by the first positioning pin 16.Input shaft 11 is inserted into output shaft 6
And it is fixed by the second positioning pin 17 between input shaft 11 and output shaft 6, in one end insertion turning machine shell 8 of input shaft 11,
The other end of input shaft 11 extend out to the outside of turning machine shell 8 and the end of output shaft 6 and is used to connect with steering column, inputs
Axis 11 and output shaft 6 are coaxial arrangement and the two synchronous rotary, and input shaft 11 drives 6 synchronous rotary of output shaft.Second positioning pin
17 be cylindrical body, and input shaft 11 has the second avoid holes for allowing the second positioning pin 17 to pass through, and the second avoid holes are in input shaft 11
On extend radially through the through-hole of setting and the second avoid holes are circular hole, output shaft 6 has allow the second positioning pin 17 passes through second
Pin hole, the second pin hole is the through-hole that setting is extended radially through on output shaft 6 and the second pin hole is circular hole.Second positioning pin 17 is same
When be inserted into the second pin hole and the second avoid holes, realize the relatively fixed of input shaft 11 and output shaft 6, input shaft 11 passes through second
Positioning pin 17 is able to drive 6 synchronous rotary of output shaft.
The connection type that power-assisted gear 12 and input shaft 11 and output shaft 6 are fixed using positioning pin, input shaft 11, power-assisted tooth
The processability of wheel 12 and output shaft 6 is good, at low cost and convenient for disassembly and assembly between output shaft 6 and power-assisted gear 12 and input shaft 11,
Set assembling technology is good.
The utility model is exemplarily described in conjunction with attached drawing above.Obviously, the utility model implements not
It is limited by aforesaid way.As long as the various unsubstantialities that the method concept and technical solution that use the utility model carry out
Improvement；Or it is not improved, the above-mentioned conception and technical scheme of the utility model are directly applied into other occasions, at this
Within the protection scope of utility model.
Claims (10)
1. electric boosting steering system, including turning machine shell, power-assisted gear, deceleration mechanism, rack gear positioning device and removable
The rack gear being set in turning machine shell and be meshed with power-assisted gear, it is characterised in that: the rack gear positioning device includes
The first positioning mechanism for being positioned in one end of the rack gear to rack gear carries out rack gear for the other end in rack gear
The second positioning mechanism positioned and the third positioning mechanism for being positioned at the position between rack gear both ends to rack gear, the
Three positioning mechanisms are between the first positioning mechanism and the second positioning mechanism.
2. electric boosting steering system according to claim 1, it is characterised in that: first positioning mechanism is to be set to
The first bushing in the turning machine shell, the first bushing is sheathed on rack gear and the first bushing is matched with turning machine shell for interference
It closes, the first bushing is located at the end of turning machine shell.
3. electric boosting steering system according to claim 2, it is characterised in that: the rack gear is movably to be set to
In turning machine shell, second positioning mechanism is the second bushing being set in turning machine shell, and the second bushing is sheathed on tooth
On item and the second bushing and turning machine shell are interference fit, and the second bushing is located at the end of turning machine shell.
4. electric boosting steering system according to claim 3, it is characterised in that: the third positioning mechanism includes rack gear
Support base, holddown plate and be set between rack support seat and holddown plate and for rack support seat apply elasticity make
Holddown spring firmly, the turning machine shell have the accommodating cavity for accommodating the rack support seat, holddown plate and turning machine
Shell connection.
5. electric boosting steering system according to claim 4, it is characterised in that: the third positioning mechanism further includes set
Sealing ring on the rack support seat, sealing ring on rack support seat along the axial arrangement one of rack support seat or
It is multiple.
6. electric boosting steering system according to claim 4, it is characterised in that: the rack gear includes with teeth section and anodontia
Section, with teeth section is equipped with the multiple rack tooths being meshed with the power-assisted gear, the both ends end face Jun Bao in the facewidth direction of rack tooth
Include fillet surface and overmoving surface；When rack tooth is moved in first bushing, fillet surface and overmoving surface are interior with the first bushing
There is gap between disc；When rack tooth is moved in second bushing, fillet surface and overmoving surface are interior with the second bushing
There is gap between disc.
7. electric boosting steering system according to claim 6, it is characterised in that: the fillet surface is located at the overmoving surface
Between the crest top land of the rack tooth, fillet surface and overmoving surface are that the angle between plane and fillet surface and overmoving surface is blunt
Angle.
8. electric boosting steering system according to claim 4, it is characterised in that: further include being set to the steering casing
The dust cover at the both ends of body, turning machine shell, which has, makes the inner chamber body of dust cover and the inner chamber body of turning machine shell be in connected state
The air discharge duct of state.
9. electric boosting steering system according to claim 4, it is characterised in that: the deceleration mechanism includes being meshed
Worm and worm wheel are equipped in the turning machine shell for that coated on the first lubricant medium at worm and wheel and will be coated on
The partition that the second lubricant medium at the power-assisted gear and the rack gear separates, partition is between power-assisted gear and worm gear.
10. electric boosting steering system according to claim 9, it is characterised in that: the worm gear is set on output shaft,
The partition has the through-hole for allowing output shaft to pass through, and the power-assisted gear is set on gear shaft, and gear shaft is inserted into output shaft
And it is fixed between gear shaft and output shaft by positioning pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821470936.0U CN209051485U (en) | 2018-09-10 | 2018-09-10 | Electric boosting steering system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821470936.0U CN209051485U (en) | 2018-09-10 | 2018-09-10 | Electric boosting steering system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209051485U true CN209051485U (en) | 2019-07-02 |
Family
ID=67048394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821470936.0U Active CN209051485U (en) | 2018-09-10 | 2018-09-10 | Electric boosting steering system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209051485U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109305217A (en) * | 2018-09-10 | 2019-02-05 | 安徽德孚转向系统股份有限公司 | Electric boosting steering system |
| CN114132376A (en) * | 2021-11-29 | 2022-03-04 | 华人运通(江苏)技术有限公司 | Steering and correcting system |
-
2018
- 2018-09-10 CN CN201821470936.0U patent/CN209051485U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109305217A (en) * | 2018-09-10 | 2019-02-05 | 安徽德孚转向系统股份有限公司 | Electric boosting steering system |
| CN109305217B (en) * | 2018-09-10 | 2024-09-24 | 安徽德孚转向系统股份有限公司 | Electric power steering system |
| CN114132376A (en) * | 2021-11-29 | 2022-03-04 | 华人运通(江苏)技术有限公司 | Steering and correcting system |
| CN114132376B (en) * | 2021-11-29 | 2023-06-13 | 华人运通(江苏)技术有限公司 | Steering return system |
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