CN1754740A - Rack electric steerage gear - Google Patents
Rack electric steerage gear Download PDFInfo
- Publication number
- CN1754740A CN1754740A CN 200410083320 CN200410083320A CN1754740A CN 1754740 A CN1754740 A CN 1754740A CN 200410083320 CN200410083320 CN 200410083320 CN 200410083320 A CN200410083320 A CN 200410083320A CN 1754740 A CN1754740 A CN 1754740A
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- gear
- bearing
- tooth bar
- motor
- ball nut
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 5
- 239000010959 steel Substances 0.000 claims abstract description 5
- 230000001141 propulsive effect Effects 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 abstract 1
- 230000001154 acute effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
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Abstract
This invention relates to gear power rotation device, which comprises the following parts: one gear, one gear bar, one roller screw, one shaft, one motor and one gear device, wherein, the gear and rotation are connected; the roller screw and large steel rollers cooperate and are fixed on the rolling screw; the shaft can rotate to support roller screw formed by taper gear to transmit drive force into roller screw from motor to form the gap with larger distance than shaft. When shaft weight is input to the gear, the axis shaft starts to support all weight to prevent taper gear overload.
Description
Technical field
The present invention relates to a kind of electric power steering apparatus, relate in particular to a kind of rack electric steerage gear, wherein accept the propulsive effort of motor in the rack electric steerage gear and produce the endplay that axial backlash between the bevel-gear sett of auxiliary force is set to larger than the bearing that supports ball nut, can when bearings almost all is applied to axial weight on the tooth bar, prevent engagement of finishing bevel gear cuter tension and motor overload by this device of this mode.
Background technology
Usually, vehicle comprises a kind of power steering system that is used to obtain steering safety.In power steering gear, a kind of HPS (fluid power steering swivel system) has been widely used in the vehicle, and wherein HPS adopts hydraulic pressure.The use of a kind of eco-friendly EPS (power steering system) increases day by day, and this system uses the rotational force of motor can easily obtain chaufeur steering operation more easily, is different from the orthodox method of using hydraulic pressure.
In electric power steering apparatus, motor by an ECU according to car speed sensor and steering torque sensor to travel condition of vehicle control, therefore when the vehicle low cruise, can provide the light and comfortable sense that turns to.When the vehicle high-speed cruising, obtain very heavy turning to and feel and stable directivity.In emergency situation, obtain the quick steering operation, therefore offer the best steering state of chaufeur.
Electric power steering apparatus is divided into cylindricality EPS (C-EPS), miniature gears EPS (E-EPS) and tooth bar EPS (R-EPS) according to installing condition.
Here, in the tooth bar EPS of electric power steering apparatus (R-EPS), be installed in the electro-motor and the gear mesh that is formed on the ball nut outside face of rack housing one side with obtuse angle or acute angle, and ball nut is by the propulsive effort rotation of electro-motor, therefore tooth bar slides along left and right directions, and the operation based on wheel flutter produces auxiliary force thus.
Fig. 1 is a schematic cross sectional views, has represented the entire infrastructure of traditional rack electric steerage gear (R-EPS).As shown in the figure, in this rack electric steerage gear, a tooth bar 2 that has the tooth bar gear teeth in its outside face one side is installed in the rack housing 1.The two ends of tooth bar 2 are connected with pull bar load 3 ball formulas, transmit the transmission power of tooth bar 2 thus.Gear 4 is installed in a side of rack housing 1 with respect to the line of centers of tooth bar 2 with a certain leaning angle, and with the tooth bar tooth mesh that is formed at tooth bar 2 one sides, will change horizontal motion into from the rotational force that steering shaft passes over thus.
A motor 5 is installed in the opposite side of rack housing 1 with acute angle or obtuse angle with respect to the line of centers of tooth bar 2.A finishing bevel gear cuter 50a meshes at an end of the axle of motor 5, and meshes with the finishing bevel gear cuter 60a that supports the ball nut 6 of tooth bar 2 opposite sides in the rack housing 1, thus the formative gear device.
In addition, ball nut 6 is installed in rack housing inside and is rotated by bearing 7.The opposite side of tooth bar 2 has ball-screw 22 in the inboard of ball nut 6, and the opposite side of described tooth bar slides by steel ball 8.
But, in traditional rack electric steerage gear, because based on the ingear backlash between finishing bevel gear cuter 50a and the 60a less than endplay, this endplay is the maxim of the outer ring (or inner ring) of and bearing 7 fixing when the inner ring of bearing 7 (or outer ring) amount of movement when movable, so finishing bevel gear cuter supports almost all the axial weight based on the tooth bar slip.Therefore, when axial weight was applied in based on tooth bar, the mate of finishing bevel gear cuter can move along left and right directions, therefore produced tight engagement.Therefore, motor produces overload.The finishing bevel gear cuter that is formed by plastic material may be destroyed by above-mentioned tension engagement, so reliability of products may be lowered.
Summary of the invention
Therefore, an object of the present invention is to overcome this problem that runs in the conventional art.
An object of the present invention is to provide a kind of rack electric steerage gear, wherein accept the propulsive effort of motor in the rack electric steerage gear and produce the endplay that axial backlash between the bevel-gear sett of auxiliary force is set to larger than the bearing that supports ball nut, the damage that can when bearings almost all is applied to axial weight on the tooth bar, prevent finishing bevel gear cuter and may cause by this device of this mode because of the tension engagement, and by preventing that engagement of finishing bevel gear cuter tension and motor overload from improving reliability of products.
In order to achieve the above object, the invention provides a kind of rack electric steerage gear, this device comprises a gear, a tooth bar, a ball nut, a bearing, a motor, a wheel word, wherein said gear is connected with wheel flutter, tooth bar is installed in the rack housing and the tooth bar gear teeth of an end and described gear mesh and the other end has ball-screw, ball nut is cooperated with a large amount of steel balls and is installed on the ball-screw, described bearing rotatably supports ball nut, described motor is installed with a certain leaning angle or right angle by the central axis with respect to tooth bar, described wheel word is formed by bevel-gear sett, be used for and will be delivered to ball nut from the propulsive effort of motor, wherein the backlash between the finishing bevel gear cuter of formative gear device is greater than the endplay of bearing.
In the present invention, bearing is the axial support bearing.
Description of drawings
Can understand the present invention better with reference to the accompanying drawings, these accompanying drawings only are for the present invention is described, therefore do not limit the present invention, wherein:
Fig. 1 is the scheme drawing of an explanation conventional electric power steering hardware; With
Fig. 2 is an amplification view, and the ball nut part according to rack electric steerage gear of the present invention has been described.
The specific embodiment
Most preferred embodiment of the present invention is described below with reference to the accompanying drawings.
The parts identical with the structure of conventional art are endowed identical component names and label.
Fig. 2 is an enlarged view, and the ball nut part according to rack electric steerage gear of the present invention has been described.As shown in the figure, be inserted into ball-bearing casing 7 and can be by this ball-bearing casing rotation around the ball nut 6 of tooth bar 2 opposite side screw rods 22, wherein ball-bearing casing 7 is installed in the inner-diameter portion whose of rack housing 1.A large amount of steel balls 8 are inserted between the screw rod 22 of ball nut 6 and tooth bar 2, guide horizontally slipping and supporting a side of tooth bar of tooth bar 2 thus.
In addition, a finishing bevel gear cuter 60a is installed in the external surface peripheral of ball nut, and motor 5 installed with obtuse angle or acute angle with respect to tooth bar 2, this motor the shaft end of motor 5 have one with finishing bevel gear cuter 60a meshed bevel gears 50a.
In the present invention, the gear clearance B between meshed bevel gears 50a and the 60a is greater than an endplay, the endplay C of the bearing of promptly rotatable back-up roller pearl nut.
Below operation of the present invention and effect will be described.
When chaufeur rotation wheel flutter (not shown), the transmission power of tooth bar 2 and following numerical value, as the rotational force, the speed of a motor vehicle, the deflection angle of wheel flutter and the direction that moment of rotation is rotated along wheel together that are delivered to gear 4 be increased one times, therefore offers the best steering state of chaufeur.
Specifically, in according to rack electric steerage gear of the present invention, as shown in Figure 2, tooth bar 2 in being installed in rack housing 1 produces the bevel-gear sett 50a of auxiliary force and the endplay C that the axial gear clearance B between the 60a is set to larger than the bearing 7 that supports ball nut by the propulsive effort of accepting motor 5 when left and right directions slides.Therefore, when axial weight was applied on the tooth bar 2, promptly when being transfused to based on the weight that left and right directions moves because of the slip of tooth bar 2, bearing 7 can support almost total weight.
Because tooth bar 2 slides along left and right directions, when the axial weight on the same direction of ball nut 6 acceptance that supports tooth bar 2, bearing 7 and finishing bevel gear cuter 60a are installed in a side and the opposite side of ball nut 6 outside faces respectively, and the axial weight of input is supported by bearing 7 or finishing bevel gear cuter 60a.If less than the axial inner gap, i.e. the endplay of bearing 7 moves axially distance just less than the distance that moves axially of bearing between the engagement finishing bevel gear cuter based on the ingear backlash of the bevel-gear sett 50a of formative gear device 100 and 60a.Therefore the axial weight of input is almost supported by the surface contact of finishing bevel gear cuter between cog.Therefore, produce the tension engagement between wheel tooth, therefore overload may be applied on the motor.
On the contrary, in the present invention because the gear clearance B between finishing bevel gear cuter 50a and the 60a is greater than the endplay C of bearing 7, though ball nut 6 by axial weight on a left side or right can move on a small quantity, bearing 7 also begins to support almost whole mobile weight.Therefore, might prevent that producing tension because of the engagement of finishing bevel gear cuter meshes and motor overload.Therefore, in the present invention, might prevent that finishing bevel gear cuter from damaging, and improves reliability of products thus.
The axial-thrust bearing that is set to support ball nut can be formed by four spot bearings, self-aligning ball bearing, angular contact bearing etc., therefore can offset outer the running out of of cone bearing that produces because of the axially and radially weight of bearing, obtain the quiet run of device thus.
As mentioned above, in according to rack electric steerage gear of the present invention, the axial backlash between the finishing bevel gear cuter is set to larger than the endplay of bearing.Therefore, when the axial weight of tooth bar was transfused to, bearing began to support almost total weight.In the present invention, just might prevent that producing tension because of the engagement of finishing bevel gear cuter meshes and motor overload.Can prevent from the possible damage of finishing bevel gear cuter that can produce to improve reliability of products thus because of tension engagement.
Because the present invention can show as various ways and not break away from spirit of the present invention or essential characteristic, should be appreciated that also that above-mentioned example is not subjected to the restriction of above-mentioned any details, unless specified in addition, otherwise should in the spirit and scope of appended claims, carry out the explanation of broad sense, therefore, all are positioned at the variation and the modification of claims scope, or the equivalent of this scope all is considered to be comprised by appended claims.
Claims (5)
1. rack electric steerage gear comprises:
One and wheel flutter bonded assembly gear;
A tooth bar, described tooth bar are installed in the rack housing and the tooth bar gear teeth of an end and this gear mesh and the other end has ball-screw;
A ball nut, described ball nut are cooperated with a large amount of steel balls and are installed on the ball-screw;
A bearing, described bearing rotatably supports ball nut;
A motor, described motor is installed with a certain leaning angle or right angle by the central axis with respect to tooth bar;
A wheel word, described wheel word is formed by bevel-gear sett, is used for the propulsive effort from motor is delivered to ball nut, and wherein the backlash between the finishing bevel gear cuter of formative gear device is greater than the endplay of bearing.
2. device according to claim 1 is characterized in that, described bearing is the axial support bearing.
3. device according to claim 2 is characterized in that, described axial support bearing is four spot bearings.
4. device according to claim 2 is characterized in that, described axial support bearing is a tilting bearing.
5. device according to claim 2 is characterized in that, described axial support bearing is an angular contact bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410083320 CN1754740A (en) | 2004-09-29 | 2004-09-29 | Rack electric steerage gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410083320 CN1754740A (en) | 2004-09-29 | 2004-09-29 | Rack electric steerage gear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1754740A true CN1754740A (en) | 2006-04-05 |
Family
ID=36688394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410083320 Pending CN1754740A (en) | 2004-09-29 | 2004-09-29 | Rack electric steerage gear |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1754740A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103453097A (en) * | 2013-09-04 | 2013-12-18 | 经纬纺织机械股份有限公司 | Nut rotating type ball screw pair device on spinning machine |
| CN104071211A (en) * | 2013-03-25 | 2014-10-01 | 日立汽车系统转向器株式会社 | Power steering apparatus and reduction mechanism for power steering |
-
2004
- 2004-09-29 CN CN 200410083320 patent/CN1754740A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104071211A (en) * | 2013-03-25 | 2014-10-01 | 日立汽车系统转向器株式会社 | Power steering apparatus and reduction mechanism for power steering |
| CN103453097A (en) * | 2013-09-04 | 2013-12-18 | 经纬纺织机械股份有限公司 | Nut rotating type ball screw pair device on spinning machine |
| CN103453097B (en) * | 2013-09-04 | 2016-01-06 | 经纬纺织机械股份有限公司 | The revolving ball screw ancillary equipment of spinning frame upper cap nut |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |