CN203844830U - Electric power steering device - Google Patents
Electric power steering device Download PDFInfo
- Publication number
- CN203844830U CN203844830U CN201420108889.0U CN201420108889U CN203844830U CN 203844830 U CN203844830 U CN 203844830U CN 201420108889 U CN201420108889 U CN 201420108889U CN 203844830 U CN203844830 U CN 203844830U
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- bearing
- worm
- worm gear
- output shaft
- shaft
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Abstract
The utility model provides an electric power steering device which can be installed well on an automobile and can prevent vibration and abnormal sound generated between an outer ring of a bearing and a shell; and comprises a first bearing (4b) embedded in an upper shell (5a); an input shaft (14) which rotationally supports the upper shell (5a) by the first bearing (4b); a second bearing (6) and a third bearing (7) which are embedded in a lower shell (5b) and separated axially relatively to the first bearing (4b); an output shaft (13) which is coaxially connected to the input shaft by the second bearing and the third bearing; and a worm reducer (9) which comprises a worm rod (21) and a worm wheel (22), and slows down rotation of an electric motor (2) and transmits auxiliary force to the output shaft, wherein the worm rod (21) is engaged relatively to the worm wheel (22) at an oblique-crossed state in the electric power steering device, the second bearing (6) is embedded in the lower shell (5b) at an interval, and the third bearing (7) is a four-point contact bearing and is pressed and embedded in the lower shell (5b).
Description
Technical field
The utility model relates to the driven steering device that possesses worm reducer.
Background technology
In recent years, on automobile, be equipped with following driven steering device, by the rotation of electro-motor is slowed down and assisted steering to rudder steering mechanism transmission through speed reduction gearing.
This driven steering device possesses: steering shaft, and it links the bearing circle as steering parts, according to the come about wheel of automobile of the operation of described bearing circle; Electro-motor, it comes to the rotational force of the auxiliary use of steering shaft transmission steering according to the operation of bearing circle; For the worm reducer as speed reduction gearing transmitting the steering auxiliary force of electro-motor to steering shaft; The housing of supporting steering shaft and electro-motor.
Steering shaft possesses: end links the input shaft that has bearing circle thereon; And the output shaft linking coaxially through torsion bar with the bottom of this input shaft.And be configured at this output shaft and link and to have for example steering gear of rack-gear type through universal coupling interlock, thereby the left and right wheels that is connected in this steering gear is come about.
Input shaft be take clutch shaft bearing supporting that the mode of movable fit in housing be supported as rotating, the second bearing supporting that the mode of movable fit in housing be supported be take as rotating in one end of output shaft, and the other end of output shaft be take to be pressed into the 3rd bearing that is embedded in housing and to support as rotating.In addition worm reducer is configured to and comprises: with the direct worm screw linking of S. A. of electro-motor; And worm gear, it is pressed into be fixed on and on output shaft, is held on the position between the second bearing and the 3rd bearing.
Fig. 5 is the lateral plan of worm screw, and Fig. 6 is the lateral plan of worm gear.In Fig. 5, in the periphery of metal worm screw 110, be formed with from the outstanding flat of thread 112 arranging of outside face 111.In Fig. 6, on the surface of resinous worm gear 120, the worm-gear toothing 121 with lead angle θ formation with flat of thread 112 engagements of worm screw 110.The worm reducer using as the speed reduction gearing of driven steering device is with the state mutually disjointing, to become the orthogonal type that the mode at right angle configures with the axis of worm screw 110 and the axis of worm gear 120.In the situation of orthogonal type, electro-motor projects upwards with respect to output shaft, and in this direction, has the gauge panel of automobile to exist, so driven steering device does not become problem with the performance that gauge panel is installed to automobile interferingly.
In addition, the worm reducer of driven steering device is the structure that possible carry out counteragent of not self-locking, so the lead angle θ of the lead angle of worm screw 110 and worm gear 120 can become large.Therefore,, when applying the steering auxiliary force of electro-motor, power axial on worm gear acts on meshed worm-gear toothing 121 usually used as component.And then, on the output shaft of supporting worm gear, produce axial power, sometimes between housing and the outer ring of the second bearing, can produce large vibration and produce abnormal sound simultaneously.
Utility model content
The utility model In view of the foregoing completes, its object is to provide to the good driven steering device of the installation of automobile, and this driven steering device, utilizes and results from the generation that the axial power of output can suppress outer ring and the vibration between housing of the second bearing and prevent abnormal sound.
In order to reach above-mentioned purpose, the purport of the technical scheme described in technical scheme 1 is to possess: housing; Be embedded in the clutch shaft bearing of described housing; Input shaft, it can be supported on described housing rotatably through described clutch shaft bearing; Be embedded in described housing, and with respect to described clutch shaft bearing the second bearing and the 3rd bearing in axial separation; Output shaft, it can be supported on described housing rotatably through described the second bearing and the 3rd bearing, and links coaxially with described input shaft; Torque sensor, its relative rotation according to described input shaft and described output shaft detects moment of torsion; Electro-motor, it is fixed on described housing, and is applied in the corresponding electric current of output with described torque sensor; And worm reducer, its rotation to described electro-motor is slowed down, and transmits auxiliary force to described output shaft, and described worm reducer is configured to and comprises: the worm screw linking linkedly with described electro-motor; And and described worm mesh and be installed on the worm gear of described output shaft between described the second bearing and described the 3rd bearing, described driven steering device is characterised in that, described worm screw is engaged in described worm gear with the state with respect to described worm gear skew intersection, described the second bearing space is embedded in described housing, described the 3rd bearing is pressed into and is embedded in described housing, and described the 3rd bearing is four spot contact bearings.
According to above-mentioned formation, utilize worm screw and worm gear with the structure of the state engagement of 2 axis skew intersections, can suppress electro-motor with respect to the height of output shaft, can with electro-motor, not interfere the mode of automobile, improve driven steering device to the installation of automobile.In addition, because the 3rd bearing of supporting worm gear and output shaft is four spot contact bearings, can prevent moving axially of output shaft, therefore can suppress the outer ring of the second bearing and the vibration of housing and prevent the generation of abnormal sound.
And then the purport of the technical scheme described in technical scheme 2 is, the lead angle of described worm gear is 0 degree, and under the state described worm screw with respect to described worm gear skew intersection, the lead angle of described worm screw is larger than the lead angle of described worm gear.
Therefore, can prevent from supporting the generation of the axial power of output of worm gear, thereby can more effectively suppress outer ring and the vibration between housing of the second bearing and further prevent the generation of abnormal sound.
According to the utility model, can provide a kind of to the good driven steering device of the installation of automobile, and this driven steering device can suppress outer ring and the vibration between housing of the second bearing and prevent the generation of abnormal sound.
Accompanying drawing explanation
Fig. 1 is the cutaway view of the related driven steering device of an embodiment of the present utility model.
Fig. 2 is the Y-Y line cutaway view of Fig. 1 that the worm reducer of the related driven steering device of an embodiment of the present utility model is shown.
Fig. 3 is the birds-eye view illustrating the state after the worm and worm wheel assembling of the related worm reducer of an embodiment of the present utility model.
Fig. 4 is a cutaway view that schematically shows the automobile that possesses the related driven steering device of an embodiment of the present utility model.
Fig. 5 is the lateral plan of the worm screw of existing worm reducer.
Fig. 6 is the lateral plan of the worm gear of existing worm reducer.Description of reference numerals
1 driven steering device, 2 electro-motors, 3 steering tubes, 4b clutch shaft bearing (needle bearing), 5a upper shell, 5b lower house, 6 second bearings (antifriction-bearing box), 7 the 3rd bearings (four spot contact bearings), 9 worm reducers (speed reduction gearing), 11 steering shafts, 11a upside steering shaft, 11b downside steering shaft, 13 output shafts, 14 input shafts, 20 torque sensors, 21 worm screws, 22 worm gears, 22a(electro-motor) S. A., 30 steering gears, 34 wheels
The specific embodiment
Based on accompanying drawing, an embodiment of the present utility model is elaborated below.Fig. 1 is the cutaway view of the related driven steering device of an embodiment of the present utility model.Fig. 2 is the cutaway view that the worm reducer 9 of the related driven steering device of an embodiment of the present utility model is shown.
As shown in Figure 1, driven steering device possesses: steering shaft 11, and its one end links the bearing circle B as steering parts; Steering tube 3, it supports steering shaft 11 for rotating; The input shaft 14 that one end and steering shaft 11 link; Rotation is linked to the output shaft 13 of input shaft 14; Detect the torque sensor 20 of the moment of torsion between input shaft 14 and output shaft 13; The upper shell 5a of supporting torque sensor 20; Signal based on torque sensor 20 transmits the electro-motor 2 of the rotational force of the auxiliary use of steering to steering shaft 11; The lower house 5b of supporting electro-motor 2; And the worm reducer 9 that the rotation of electro-motor 2 is slowed down.Driven steering device utilizes this output shaft 13, via universal coupling 31a, tween drive shaft 31 and universal coupling 31a rotation, is linked to for example rack-gear type steering gear 30.
By direction of operating dish B, make steering shaft 11 rotations.The rotation of this steering shaft 11 is converted to the vehicle body straight reciprocating motion of direction to the left and right via rack-gear type steering gear 30.Thus, realize coming about of wheel 34.In addition, act on the steering moment of torsion of steering part B, the relative swing offset amount based between input shaft 14 and output shaft 13, is arranged near the torque sensor of steering shaft 11 20 and detects.The detected torque rating of torque sensor 20 is passed to ECU(Electronic Control Unit: electronic control unit) 16.ECU16 based on torque rating with the speed of a motor vehicle that never graphic car speed sensor provides etc., drives the electro-motor 2 of controlling the auxiliary use of steering via driving circuit 40.
By the control of ECU16, the propulsive effort that electro-motor 2 produces is slowed down by worm reducer 9, and to the output shaft 13(that is linked to steering shaft 11 in other words, bearing circle B) transmit.The power that is delivered to output shaft 13 is transmitted to rack-gear type steering gear 30.Steering is assisted thus.The propulsive effort that electro-motor 2 produces for steering bearing circle B like this.
Steering shaft 11 possesses: upside steering shaft 11a, and its link direction dish B, and be supported in steering tube 3 by bearing 4a; And downside steering shaft 11b, its can relatively move with respect to this upside steering shaft 11a ground spline be embedded in this upside steering shaft 11a.
Input shaft 14 is in the bottom of downside steering shaft 11b, and the pin 16 that is positioned together with torsion bar 12 links, and the upper end of input shaft 14 is supported as rotating by clutch shaft bearing 4b in upper shell 5a.
Output shaft 13 is configured to that upper end is embedded with the bottom of input shaft 14 and bottom is embedded with the tubular of torsion bar 12, and by locating dowel pin 16, links the bottom of torsion bars 12.In addition, output shaft 13 can be supported in lower house 5b rotatably via the second bearing 6, the 3rd bearing 7 that are disposed at the both sides of worm gear 22.The second bearing 6 is installed on upper shell 5a in the mode of movable fit.The 3rd bearing 7 uses four spot contact bearings, to be pressed into chimeric mode, is installed on lower house 5b.By making to support the 3rd bearing 7 of worm gear 22 and output shaft 13, be 4 spot contact bearings, can prevent the movement of thrust direction and the radial direction of output shaft 13 simultaneously.
Housing 5 for example consists of aluminum alloy, is configured to and comprises each other chimeric upper shell 5a and lower house 5b.Particularly, lower house 5b is tubular, and the ring-shaped edge portion of its upper end is embedded in the annular stepped portion of the lower end periphery of upper shell 5a.In lower house 5b, take in worm screw 21 and worm gear 22 as speed reduction gearing, in upper shell 5a, taken in torque sensor 20.
Torque sensor 20 utilizes the input shaft 14 corresponding with the torsion of the torsion bar 12 producing because of direction of operating dish B and the relative swing offset amount of output shaft 13 to detect the steering moment of torsion that puts on bearing circle B.The target 20a of one that forms torque sensor 20 is scheduled input shaft 14 by outer build-in.In addition, with the upper end of the outer build-in of the opposed target 20b of target 20a due to output shaft 13.According to drivings such as torque sensor 20 detected moments of torsion, control electro-motor 2.
Worm reducer 9 has: the worm screw 21 as driven wheel linking with the axle drive shaft 2a of electro-motor 2; And with the worm gear 22 as driven gear of this worm screw 21 engagements.Worm screw 21 is connected with output shaft 13 via worm gear 22.
As shown in Figure 2, worm screw 21 has by central portion the metal spindle unit that the 21a of tooth portion, two ends have axial region 21b, 21c and forms, the axial region 21b of one side is linked to axle drive shaft 2a by shaft adapter 23 rotations, in addition, axial region 21b, the 21c of both sides are in bearing 24,25 is supported in the second incorporating section 3d.
Worm gear 22 has tooth and has embedded hole at central part at peripheral part, and outer build-in is due to the axial centre of output shaft 13.
Next, with reference to Fig. 3, the related worm reducer 9 of an embodiment of the present utility model is elaborated.Fig. 3 illustrates the related worm screw 21 of worm reducer 9 and the birds-eye view of the state after worm gear 22 assemblings of present embodiment.
The periphery of metal worm screw 21 is formed with from the outstanding tooth 18 arranging of outside face.On the side face of resinous worm gear 22, be formed with the tooth 17 with the worm gear 22 of tooth 18 engagement of worm screw 21.In the worm reducer 9 of present embodiment, at the lead angle β of worm gear 22, be 0 degree, less than the lead angle of worm screw 21, and under the state of axis each other with angle [alpha] skew intersection, assembling worm screw 21 and worm gear 22.
With respect to the lead angle of worm screw 21, the lead angle β of worm gear 22 is 0 degree.Therefore,, for the tooth 18 of worm screw 21 and the tooth of worm gear 22 17 these points of engagement, the component of the thrust direction of worm gear 22 (axially) diminishes.Therefore, be configured to the structure that produces hardly axial power at the output shaft 13 of supporting worm gear 22.
Below, with reference to accompanying drawing, to the driven steering device of an embodiment of the present utility model, the installation to automobile is specifically described.Fig. 4 is the cutaway view that the automobile C1 that possesses the related driven steering device 1 of an embodiment of the present utility model is schematically shown.
Automobile C1 has the interior space being formed by vehicle body 29 divisions, and this interior space is divided into engine room S2 and car chamber S1 by dividing plate 28.Engine room S2 is disposed at the anterior of automobile C1 and takes in driving engine etc.Car chamber S1 is divided into operator's compartment S3 and the instrument face plate chamber S4 that waits the space of taking as driver by instrument face plate 26.In the S4 of instrument face plate chamber, be provided with the reinforcement of instrument panel 27 along overall width direction.Reinforcement of instrument panel 27 is for example round tubular strengthening part, in vehicle body 29 combinations of the two ends with overall width direction and automobile C1.
The steering shaft 11 of driven steering device 1, steering tube 3 and housing 5, through the peristome 26a that is arranged on instrument face plate 26, and a part to than instrument face plate 26 by side-prominent after automobile C1.The rearward end of steering shaft 11 links the bearing circle B that is useful on steering automobile C1.
Steering tube 3 and housing 5 are supported on reinforcement of instrument panel 27.Particularly, be supported on the upper fixed parts 8 and steering tube 3 bolted of reinforcement of instrument panel 27.Be supported on the lower fixed parts 10 and housing 5 bolted of instrument carrier panel reinforcing member 27.
Steering tube 3 and housing 5 are configured to the state tilting with respect to vertical, and from the rear of automobile C1 forwards (from the right side of Fig. 4 to the left) extends towards below.In addition, auxiliary with electro-motor 2, towards top, (from the downside of Fig. 4 to upside) is disposed at housing 5 around in steering.
Tween drive shaft 31 connects dividing plate 28 and arrives engine room S2, in engine room S2, links with steering gear 30.The both ends of steering gear 30 link through track arm (not shown) and wheel 34.
According to above formation, can obtain following effect, utilize the worm screw 21 of worm reducer 9 and worm gear 22 with the axis separately structure of the state engagement of skew intersection each other, can make the relative vertical axis of electro-motor 2 significantly tilt towards the place ahead of automobile C1, thereby suppress the height of electro-motor 2 relative output shafts 13.Electro-motor 2 can be installed as simply not with instrument face plate chamber S4 in reinforcement of instrument panel 27 and instrument face plate 26 interfere, thereby can improve driven steering device 1 to the installation of automobile C1.And then can suppress electro-motor 2 with respect to the height of output shaft 13, it is large that the distance thus and between instrument face plate 26 becomes, and can reduce the height of instrument face plate 26 in the S1 of car chamber, can expand the space of operator's compartment S3.
In addition, for the related worm reducer 9 of an embodiment of the present utility model, by making to support the worm gear 22 of driven steering device 1 and the bearing of output shaft 13 6 is four spot contact bearings, can prevent moving axially of output shaft 13, therefore, can suppress outer ring and the vibration between upper shell 5a of the second bearing 6 and prevent the generation of abnormal sound.
Therefore and then the lead angle of worm gear 22 is 0 degree, the state that worm screw 21 is skew intersection with respect to worm gear 22, can prevent from supporting the generation of axial power of the output shaft 13 of worm gear 22.Therefore, can prevent the movement of thrust direction and the radial direction of output shaft 13 simultaneously, can more effectively suppress the outer ring of the second bearing 6 and the vibration of upper shell 5a and also further prevent the generation of abnormal sound.
In addition, the embodiment of Fig. 3, in the situation that make the reduction ratio of worm reducer 9 and the distance between shafts of worm screw 21 and worm gear 22 certain, the worm reducer 9 of present embodiment, by making the lead angle β of worm gear 22 less than the lead angle of worm screw 21, can make worm screw 21 often revolve to turn around the engaging-in amount (pitch amount) of corresponding worm gear 22 to diminish, thereby make the maximum modulus of worm gear 22 become large.Therefore, can realize the miniaturization of worm gear 22 and worm screw 21, thereby obtain the effect in reduction space.
Above, embodiment of the present utility model has been carried out to specific description, but the utility model is not limited to this, can in the scope that does not depart from its purport, carries out suitable distortion.
Claims (2)
1. a driven steering device, possesses: housing; Be embedded in the clutch shaft bearing of described housing; Input shaft, it can be supported on described housing rotatably through described clutch shaft bearing; Be embedded in described housing, and with respect to described clutch shaft bearing the second bearing and the 3rd bearing in axial separation; Output shaft, it can be supported on described housing rotatably through described the second bearing and the 3rd bearing, and links coaxially with described input shaft; Torque sensor, its relative rotation according to described input shaft and described output shaft detects moment of torsion; Electro-motor, it is fixed on described housing, and is applied in the corresponding electric current of output with described torque sensor; And worm reducer, its rotation to described electro-motor is slowed down and is transmitted auxiliary force to described output shaft,
Described worm reducer is configured to and comprises: the worm screw linking linkedly with described electro-motor; And and described worm mesh and be installed on the worm gear of described output shaft between described the second bearing and described the 3rd bearing,
Described driven steering device is characterised in that,
Described worm screw is engaged in described worm gear with the state with respect to described worm gear skew intersection, and described the second bearing space is embedded in described housing, and described the 3rd bearing is pressed into and is embedded in described housing, and described the 3rd bearing is four spot contact bearings.
2. driven steering device according to claim 1, is characterized in that,
The lead angle of described worm gear is 0 degree, and under the state described worm screw with respect to described worm gear skew intersection, the lead angle of described worm screw is larger than the lead angle of described worm gear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420108889.0U CN203844830U (en) | 2014-03-11 | 2014-03-11 | Electric power steering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420108889.0U CN203844830U (en) | 2014-03-11 | 2014-03-11 | Electric power steering device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203844830U true CN203844830U (en) | 2014-09-24 |
Family
ID=51557881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420108889.0U Expired - Fee Related CN203844830U (en) | 2014-03-11 | 2014-03-11 | Electric power steering device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203844830U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107207036A (en) * | 2015-02-04 | 2017-09-26 | 蒂森克虏伯普利斯坦股份公司 | Device for auxiliary torque to be introduced to steering spindle |
| CN109249985A (en) * | 2017-07-12 | 2019-01-22 | 株式会社捷太格特 | Transfer |
| CN109955896A (en) * | 2017-12-22 | 2019-07-02 | 美国Trw天合汽车集团 | Torque is superimposed transfer |
| CN112829822A (en) * | 2019-11-22 | 2021-05-25 | 纳博特斯克有限公司 | Drive unit and electric power steering apparatus |
-
2014
- 2014-03-11 CN CN201420108889.0U patent/CN203844830U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107207036A (en) * | 2015-02-04 | 2017-09-26 | 蒂森克虏伯普利斯坦股份公司 | Device for auxiliary torque to be introduced to steering spindle |
| CN107207036B (en) * | 2015-02-04 | 2019-11-08 | 蒂森克虏伯普利斯坦股份公司 | For auxiliary torque to be introduced to the device of steering shaft |
| CN109249985A (en) * | 2017-07-12 | 2019-01-22 | 株式会社捷太格特 | Transfer |
| CN109955896A (en) * | 2017-12-22 | 2019-07-02 | 美国Trw天合汽车集团 | Torque is superimposed transfer |
| CN109955896B (en) * | 2017-12-22 | 2022-07-29 | Zf主动安全与电子美国有限责任公司 | Torque superposition steering device |
| CN112829822A (en) * | 2019-11-22 | 2021-05-25 | 纳博特斯克有限公司 | Drive unit and electric power steering apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140924 Termination date: 20150311 |
|
| EXPY | Termination of patent right or utility model |