CN111391914A - Double-motor electric direct-drive steering gear - Google Patents
Double-motor electric direct-drive steering gear Download PDFInfo
- Publication number
- CN111391914A CN111391914A CN202010253756.2A CN202010253756A CN111391914A CN 111391914 A CN111391914 A CN 111391914A CN 202010253756 A CN202010253756 A CN 202010253756A CN 111391914 A CN111391914 A CN 111391914A
- Authority
- CN
- China
- Prior art keywords
- nut
- gear
- retainer
- roller screw
- rollers
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0421—Electric motor acting on or near steering gear
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0442—Conversion of rotational into longitudinal movement
- B62D5/0445—Screw drives
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
- F16H25/2247—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with rollers
- F16H25/2252—Planetary rollers between nut and screw
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H37/00—Combinations of mechanical gearings, not provided for in groups F16H1/00 - F16H35/00
- F16H37/12—Gearings comprising primarily toothed or friction gearing, links or levers, and cams, or members of at least two of these types
- F16H37/124—Gearings comprising primarily toothed or friction gearing, links or levers, and cams, or members of at least two of these types for interconverting rotary motion and reciprocating motion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0463—Grease lubrication; Drop-feed lubrication
- F16H57/0464—Grease lubrication
Abstract
The utility model provides a bi-motor formula is electronic directly drives steering gear, includes driving motor one, planet roller lead screw, sector gear, output shaft and driving motor two, and the output shaft of driving motor one links to each other with the one end of planet roller lead screw, and the lead screw other end of planet roller lead screw links to each other with the output shaft of driving motor two, and planet roller lead screw passes through the gear engagement with sector gear and links to each other, and sector gear installs on the output shaft. The invention has high working efficiency, small noise pollution and no air leakage and liquid leakage; the reliability of the whole system is improved by adopting a double-motor structure; when large steering force is needed, the two driving motors can be used simultaneously, so that the steering force is increased, and the flexibility of the whole mechanism is enhanced; the complexity of the steering mechanism can be simplified, the overall dimension can be reduced, and the service life can be prolonged.
Description
Technical Field
The invention belongs to the technical field of vehicle steering, and particularly relates to a double-motor electric direct-drive steering gear.
Background
The traditional heavy commercial vehicle generally adopts a circulating ball type hydraulic power steering gear, and an engine drives a hydraulic oil pump to provide steering power for the vehicle; the new energy automobile cancels the engine, so the hydraulic oil pump is driven by the motor to provide power for the vehicle steering. Light commercial vehicles mostly adopt a vacuum boosting mode to provide power for steering because of small steering force. In any form, the vehicle is equipped with a hydraulic source that can continuously provide power for the system. During the running process of the vehicle, the steering gear works for a short time, so that the ineffective loss of energy is caused, and the noise of the hydraulic source during working can pollute the environment and cause the fatigue of drivers and passengers.
In order to solve the technical problems, the prior art uses an electric power steering device for a commercial vehicle, the mechanism adopts a circulating ball type structure, when the load of a front shaft of the vehicle is large, the radial size of the structure needs to be greatly increased in order to meet the stress requirement, so that the overall size of the whole steering gear is increased, and the problem that the steering gear cannot be arranged is caused under the condition of limited vehicle installation space, so that the use condition of the electric power steering device is limited by the space on the vehicle.
Disclosure of Invention
In view of the problems in the prior art, the invention aims to provide a double-motor electric direct-drive steering gear.
The invention adopts the following technical scheme:
a double-motor electric direct-drive steering gear comprises a first driving motor, a planetary roller screw, a sector gear, an output shaft and a second driving motor.
And an output shaft of the first driving motor is connected with one end of a planetary roller screw, and the other end of the planetary roller screw is connected with an output shaft of the second driving motor.
The planetary roller screw is meshed with the sector gear through a gear, and the sector gear is installed on the output shaft.
Further, the planetary roller screw is a standard planetary roller screw. The standard planetary roller screw comprises a screw rod, rollers, a nut, a gear ring, a retainer and an elastic retainer ring. Elastic check rings are arranged at two ends in the nut respectively and are installed in a clamp spring groove of the nut. And a retainer is arranged on the inner side of the elastic retainer ring. And a gear ring is arranged on the inner side of the retainer. And a plurality of rollers are arranged between the screw rod and the nut, and the screw rod is connected with the nut through the rollers. And outer gear structures are arranged at two ends of the roller and are meshed with inner teeth on corresponding gear rings. The two ends of the roller are extended into the holes of the corresponding retainer, and the rollers are connected through a gear ring.
Further, the planetary roller screw is a non-standard planetary roller screw. The non-standard planetary roller screw comprises a screw rod, rollers, a nut and a retainer ring retainer. And a plurality of rollers are arranged between the screw rod and the nut, and the screw rod is connected with the nut through the rollers. The rollers are mounted in elongated circular grooves in a cage which separates the rollers. And a retainer ring is arranged on the outer side of the retainer and is fixed on the nut. The retainer ring and the nut can be connected through threads or can be connected through interference fit.
Furthermore, the lead screw and the nut adopt triangular threads with the tooth form angle of ninety degrees, and the roller adopts convex arc-shaped external threads. The roller and the screw rod and the roller and the nut are in point contact.
Furthermore, the planet roller screw adopts a grease lubrication mode, and the lubricating grease contains nano additives such as nano copper powder, nano graphite, nano calcium carbonate, nano PTFE and the like.
Furthermore, the planetary roller screw adopts a grease lubrication mode, and the lubricating grease contains magnesium hydroxy silicate particles, wherein the particle size of the particles is less than ten microns.
Furthermore, a rack is processed on the outer side of the nut, and the rack is meshed with the sector gear. The sector gear adopts a positive modified gear.
The invention has the beneficial effects that:
1) because a hydraulic system is cancelled, the working efficiency is high, the noise pollution is low, and the phenomena of air leakage and liquid leakage do not exist.
2) After the double-motor structure is adopted, when one motor is damaged, the other motor can take the steering work, so that the reliability of the whole system is improved.
3) When a large steering force is required, the two driving motors can be used simultaneously, so that the steering force is increased, and the flexibility of the whole mechanism is enhanced.
4) The planetary roller mechanism with the self-repairing function is adopted, so that the service life can be prolonged.
5) Especially on various new energy vehicles, because the power source does not depend on the engine and automatic control is easy to realize, the device has wider application prospect compared with the traditional structure.
Drawings
FIG. 1 is a schematic structural diagram of a first embodiment and a second embodiment;
FIG. 2 is a cross-sectional view of a standard planetary roller screw;
FIG. 3 is a profile view of a planetary roller screw;
FIG. 4 is a cross-sectional view of a non-standard planetary roller screw;
fig. 5 is an outline view of a non-standard planetary ball screw holder.
Reference numerals: 1-driving motor I, 2-planetary roller screw, 3-sector gear, 4-output shaft, 5-retainer I, 6-gear ring I, 7-roller, 8-nut, 9-elastic retainer I, 10-screw, 11-gear ring II, 12-retainer II, 13-elastic retainer II, 14-driving motor II, 15-retainer II, 16-retainer III, 17-retainer I.
Detailed Description
For the convenience of understanding, the technical scheme of the invention is further described in detail by embodiments with reference to the attached drawings:
the first embodiment is as follows:
as shown in fig. 1, 2 and 3, the double-motor electric direct-drive steering gear comprises a first driving motor 1, a planetary roller screw 2, a sector gear 3, an output shaft 4 and a second driving motor 14.
An output shaft of the driving motor I1 is connected with one end of the planetary roller screw 2; the other end of the screw rod of the planetary roller screw rod 2 is connected with an output shaft of a second driving motor 14.
The planetary roller screw 2 is meshed with the sector gear 3 through a gear, and the sector gear 3 is installed on the output shaft 4.
The planetary roller screw 2 is a standard planetary roller screw. The planetary roller screw 2 comprises a screw 10, rollers 7, a nut 8, a first gear ring 6, a second gear ring 11, a first retainer 5, a second retainer 12, a first elastic retainer ring 9 and a second elastic retainer ring 13.
Two ends in the nut 8 are respectively provided with a first elastic retainer ring 9 and a second elastic retainer ring 13; the first elastic retainer ring 9 and the second elastic retainer ring 13 are fixed in a clamp spring groove of the nut 8.
The inner side of the elastic retainer ring I9 is provided with a retainer I5, and the inner side of the elastic retainer ring II 13 is provided with a retainer II 12. The first elastic retainer ring 9 and the second elastic retainer ring 13 can prevent the first retainer 5 and the second retainer 12 from being separated from the nut 8.
The inner sides of the first retainer 5 and the second retainer 12 are respectively provided with a first gear ring 6 and a second gear ring 11.
A plurality of rollers 7 are arranged between the screw rod 10 and the nut 8, and the screw rod 10 is connected with the nut 8 through the rollers 7.
And the two ends of the roller 7 are provided with external gear structures and are meshed with internal teeth on the first gear ring 6 and the second gear ring 11.
The tail ends of the two ends of the roller 7 extend into the holes in the first retainer 5 and the second retainer 12, so that the rollers 7 are always in a separated state in the moving process, and mutual friction is avoided.
The rollers 7 are connected through the first gear ring 6 and the second gear ring 11, when one roller 7 starts to roll, the rotary motion of the roller is transmitted to the other rollers 7 through the first gear ring 6 and the second gear ring 11, all the rollers 7 are ensured to rotate at the same speed, and therefore the friction coefficient between the screw rod 10 and the rollers 7 and between the rollers 7 and the nut 8 is reduced, and the transmission efficiency is improved.
The screw rod 10 and the nut 8 adopt triangular threads with the tooth form angle of ninety degrees, and the roller 7 adopts convex arc external threads. The roller 7, the screw rod 10 and the nut 8 are in point contact, so that external lubricating grease can easily enter, the roller is stored nearby the friction surface, the lubricating effect of the friction surface can be effectively improved, the friction coefficient is reduced, and the transmission efficiency of the mechanism is further improved.
The planetary roller screw 2 adopts a grease lubrication mode, and the grease contains magnesium hydroxy silicate particles, and the particle size of the particles is less than ten microns. Therefore, the mechanism has a self-repairing function, and the service life of the mechanism is prolonged.
And a rack is processed on the outer side of a nut 8 in the planetary roller screw 2, and is meshed with the sector gear 3 through a gear-rack structure. The sector gear 3 in the mechanism adopts a positive displacement gear, so that the bearing capacity of the gear can be improved, and the overall dimension of the gear is reduced, so that the mechanism becomes more compact.
The working principle is as follows:
when the electric steering mechanism works, the first driving motor 1 and the second driving motor 14 can drive the screw rod 10 in the planetary roller screw rod 2 to rotate independently or simultaneously, the planetary roller screw rod 2 converts the rotation motion into the linear motion of the nut 8, and the gear rack mechanism consisting of the nut 8 and the sector gear 3 drives the output shaft 4 to move, so that the power is transmitted to a vehicle steering system.
Example two:
as shown in fig. 1, 3, 4 and 5, a dual-motor electric direct-drive steering gear comprises a first driving motor 1, a planetary roller screw 2, a sector gear 3, an output shaft 4 and a second driving motor 14.
An output shaft of the driving motor 1 is connected with one end of the planetary roller screw 2; the other end of the screw rod of the planetary roller screw rod 2 is connected with an output shaft of a second driving motor 14.
The planetary roller screw 2 is meshed with the sector gear 3 through a gear, and the sector gear 3 is installed on the output shaft 4.
The planetary roller screw 2 is a non-standard planetary roller screw. The planetary roller screw 2 comprises a screw 10, rollers 7, a nut 8, a first retainer ring 17, a second retainer ring 15 and a third retainer 16.
A plurality of rollers 7 are arranged between the screw rod 10 and the nut 8. The screw 10 is connected to the nut 8 via the rollers 7.
The rollers 7 are mounted in elongated circular grooves in the third cage 16, and the rollers 7 are separated by the third cage 16.
A first retainer ring 17 and a second retainer ring 15 are arranged outside the third retainer 16, and the first retainer ring 17 and the second retainer ring 15 are fixed on the nut 8.
The first retainer ring 17 and the second retainer ring 18 can be connected with the special nut 16 through threads or interference fit.
The screw rod 10 and the nut 8 adopt triangular threads with the tooth form angle of ninety degrees, and the roller 7 adopts convex arc external threads.
The planet roller screw 2 adopts a grease lubrication mode, and the lubricating grease contains nano additives such as nano copper powder, nano graphite, nano calcium carbonate, nano PTFE and the like. The mechanism has a self-repairing function and the service life is prolonged.
And a rack is processed on the outer side of a nut 8 in the planetary roller screw 2, and the planetary roller screw is meshed with the sector gear 3 through a gear rack. The sector gear 3 in the mechanism adopts a positive displacement gear, so that the bearing capacity of the gear can be improved, the overall dimension is reduced, and the mechanism is more compact.
The working principle is as follows:
when the electric steering mechanism works, the first driving motor 1 and the second driving motor 14 can drive the specific screw rod 15 in the planetary roller screw rod 2 to rotate independently or simultaneously, the planetary roller screw rod 2 converts the rotation motion into the linear motion of the specific nut 16, and the gear rack mechanism formed by the specific nut 16 and the sector gear 3 drives the output shaft 4 to move, so that the power is transmitted to a vehicle steering system.
The above embodiments are merely illustrative or explanatory of the technical solution of the present invention and should not be construed as limiting the technical solution of the present invention, and it is apparent that various modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the present invention. The present invention also encompasses these modifications and variations provided they come within the scope of the claims and their equivalents.
Claims (9)
1. The double-motor electric direct-drive steering gear comprises a first driving motor, a planetary roller screw, a sector gear, an output shaft and a second driving motor, wherein the output shaft of the first driving motor is connected with one end of the planetary roller screw, the other end of a screw rod of the planetary roller screw is connected with the output shaft of the second driving motor, the planetary roller screw is connected with the sector gear through gear meshing, and the sector gear is installed on the output shaft.
2. The dual-motor electric direct drive steering gear according to claim 1, characterized in that: the planet roller screw is a standard planet roller screw, the planet roller screw comprises a screw rod, rollers, a nut, a gear ring, a retainer and elastic check rings, the elastic check rings are arranged at the two ends of the inner side of the nut respectively and are fixed in a clamp spring groove of the nut, the retainer is arranged on the inner side of the elastic check ring, the gear ring is arranged on the inner side of the retainer, outer gear structures are arranged at the two ends of the rollers and are meshed with inner teeth on the corresponding gear rings, the two ends of the rollers extend into holes of the corresponding retainer respectively, and the rollers are connected through the gear ring.
3. The dual-motor electric direct drive steering gear according to claim 1, characterized in that: the planet roller screw is a non-standard planet roller screw, the planet roller screw comprises a screw rod, rollers, a nut, a retainer ring and a retainer, the rollers are arranged in a long circular groove on the retainer, the retainer separates the rollers, the retainer ring is arranged on the outer side of the retainer, and the retainer ring is fixed on the nut.
4. The dual-motor electric direct drive steering gear according to claim 3, characterized in that: the retainer ring and the nut can be connected through threads or in interference fit.
5. The dual-motor electric direct drive steering gear according to claim 2 or 3, characterized in that: and a plurality of rollers are arranged between the screw rod and the nut, and the screw rod is connected with the nut through the rollers.
6. The dual-motor electric direct drive steering gear according to claim 5, characterized in that: the lead screw and the nut adopt triangular threads with a tooth form angle of ninety degrees, the roller adopts convex arc-shaped external threads, and the roller and the lead screw and the roller and the nut are in point contact.
7. The dual-motor electric direct drive steering gear according to claim 5, characterized in that: the planet roller screw adopts a grease lubrication mode, and the lubricating grease contains nano copper powder, nano graphite, nano calcium carbonate and nano PTFE.
8. The dual-motor electric direct drive steering gear according to claim 5, characterized in that: the planetary roller screw adopts a grease lubrication mode, and the lubricating grease contains magnesium hydroxy silicate particles, wherein the particle size of the particles is less than ten microns.
9. The dual-motor electric direct drive steering gear according to any one of claims 2 to 8, characterized in that: the outer side of the planetary roller screw nut is provided with a rack, the planetary roller screw nut is meshed with a sector gear through the rack, and the sector gear adopts a positive displacement gear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010253756.2A CN111391914A (en) | 2020-04-02 | 2020-04-02 | Double-motor electric direct-drive steering gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010253756.2A CN111391914A (en) | 2020-04-02 | 2020-04-02 | Double-motor electric direct-drive steering gear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111391914A true CN111391914A (en) | 2020-07-10 |
Family
ID=71425091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010253756.2A Pending CN111391914A (en) | 2020-04-02 | 2020-04-02 | Double-motor electric direct-drive steering gear |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111391914A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115855169A (en) * | 2023-03-01 | 2023-03-28 | 惠州市金箭精密部件有限公司 | Automatic testing device and method for micro lead screw and micro lead screw |
-
2020
- 2020-04-02 CN CN202010253756.2A patent/CN111391914A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115855169A (en) * | 2023-03-01 | 2023-03-28 | 惠州市金箭精密部件有限公司 | Automatic testing device and method for micro lead screw and micro lead screw |
| CN115855169B (en) * | 2023-03-01 | 2023-09-01 | 惠州市金箭精密部件有限公司 | Automatic testing device and testing method for micro screw rod |
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