CN111391915A - Screw nut and steering pull rod integrated electric steering device - Google Patents

Screw nut and steering pull rod integrated electric steering device Download PDF

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Publication number
CN111391915A
CN111391915A CN202010253774.0A CN202010253774A CN111391915A CN 111391915 A CN111391915 A CN 111391915A CN 202010253774 A CN202010253774 A CN 202010253774A CN 111391915 A CN111391915 A CN 111391915A
Authority
CN
China
Prior art keywords
nut
screw
retainer
steering
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
Application number
CN202010253774.0A
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Chinese (zh)
Inventor
王玉海
王辛立
张鹏雷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao Hailing Yuanzhi Technology R & D Co ltd
Original Assignee
Qingdao Hailing Yuanzhi Technology R & D Co ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Qingdao Hailing Yuanzhi Technology R & D Co ltd filed Critical Qingdao Hailing Yuanzhi Technology R & D Co ltd
Priority to CN202010253774.0A priority Critical patent/CN111391915A/en
Publication of CN111391915A publication Critical patent/CN111391915A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D7/00—Steering linkage; Stub axles or their mountings
    • B62D7/20—Links, e.g. track rods
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Power Steering Mechanism (AREA)

Abstract

A screw nut and steering pull rod integrated electric steering device comprises a driving motor, a planetary roller screw, a hinge and a steering drag rod. A speed reducer is arranged inside the driving motor. And an output shaft of the driving motor is connected with the planetary roller screw. The planet roller screw rod is connected with the steering drag link through a hinge. The invention has high working efficiency, small noise pollution and no air leakage and liquid leakage because a hydraulic system is cancelled; particularly on various new energy vehicles, the power source of the vehicle does not depend on an engine and is easy to realize automatic control, so the vehicle has wider application range compared with the traditional structure; by adopting the planetary roller mechanism with the self-repairing function, the complexity of the steering mechanism can be simplified, the overall dimension of the mechanism can be reduced, and the service life can be prolonged.

Description

Screw nut and steering pull rod integrated electric steering device
Technical Field
The invention belongs to the technical field of heavy trucks, and particularly relates to an integrated electric steering device of a screw nut and a steering pull rod.
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 problem, 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 appearance 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 present invention is directed to an electric power steering apparatus having a lead screw nut and a steering rod integrated therewith.
The invention adopts the following technical scheme:
a screw nut and steering pull rod integrated electric steering device comprises a driving motor, a planetary roller screw, a hinge and a steering drag rod.
A speed reducer is arranged inside the driving motor.
And an output shaft of the driving motor is connected with the planetary roller screw.
The planet roller screw rod is connected with the steering drag link through a hinge.
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.
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 gear rings are respectively arranged at the two ends in the nut. And a retainer is arranged on the outer side of the gear ring. And outer gears are designed at two ends of the roller and are meshed with inner teeth on the gear ring. The rollers are connected through a gear ring. The roller is connected with the retainer through a hole on the retainer. An elastic retainer ring is designed on the outer side of the retainer; the circlip is installed in the circlip groove of the nut.
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, a retainer and a retainer ring. And two ends of the nut are respectively provided with a retainer ring, and the inner side of each retainer ring is provided with a 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 and separated by elongated circular slots in the cage.
Furthermore, the retainer ring and the nut can be connected through threads or interference fit.
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 magnesium hydroxy silicate particles is less than 10 um.
Furthermore, the non-standard planetary roller screw adopts a grease lubrication mode, and the lubricating grease contains nano copper powder, nano graphite, nano calcium carbonate and nano PTFE.
Furthermore, the lead screw and the nut are triangular threads with a tooth form angle of ninety degrees, and the roller is provided with convex arc-shaped external threads.
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) Particularly, on various new energy vehicles, the power source of the vehicle does not depend on an engine, and automatic control is easy to realize, so that the vehicle has a wider application range compared with the traditional structure.
3) By adopting the planetary roller mechanism with the self-repairing function, the complexity of the steering mechanism can be simplified, the overall dimension of the mechanism can be reduced, and the service life can be prolonged.
Drawings
FIG. 1 is a schematic structural diagram of a first embodiment and a second embodiment;
FIG. 2 is a cross-sectional view of the planetary roller screw with markings;
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, 2-planetary roller screw, 3-hinge, 4-steering drag link, 5-first retainer, 6-first gear ring, 7-roller, 8-nut, 9-first elastic retainer ring, 10-screw, 11-second gear ring, 12-second retainer, 13-second elastic retainer ring, 14-first retainer ring, 15-second retainer ring and 16-third retainer ring.
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:
a screw nut and steering pull rod integrated electric steering device comprises a driving motor 1, a planetary roller screw 2, a hinge 3 and a steering drag rod 4.
The speed reducer is arranged in the driving motor 1, so that the structure can be simplified, and the mechanism is more compact.
An output shaft of the driving motor 1 is connected with the planetary roller screw 2.
The planetary roller screw 2 is connected to a trailing arm 4 of the vehicle via a joint 3.
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.
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 a first gear ring 6 and a second gear ring 11 are respectively arranged at two ends in the nut 8.
And outer gear structures are designed at two ends of the roller 7, and the roller 7 is meshed with inner teeth on the first gear ring 6 and the second gear ring 11.
The two ends of the roller 7 are inserted into the holes on the first retainer 5 and the second retainer 12, so that the rollers 7 are always in a separated state in the motion process, and mutual friction is avoided. A first elastic check ring 9 and a second elastic check ring 13 are designed on the outer sides of the first retainer 5 and the second retainer 12; the first elastic retainer ring 9 and the second elastic retainer ring 13 are arranged in a clamp spring groove of the nut 8, and the first retainer 5 and the second retainer 12 are prevented from being separated from the nut 8.
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, and all the rollers 7 are ensured to rotate at the same speed, so that 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 lubricating grease contains magnesium hydroxy silicate particles, and the particle size of the magnesium hydroxy silicate particles is less than 10 um. Therefore, the mechanism has a self-repairing function, and the service life of the mechanism is prolonged.
The working principle is as follows: when the electric steering mechanism works, the driving motor 1 drives the screw rod 10 in the planetary roller screw 2 to rotate, the planetary roller screw 2 converts the rotary motion into the linear motion of the nut 8, and the nut 8 drives the steering drag link 4 through the hinge 3 to complete the steering action.
Example two:
as shown in fig. 1, 3, 4 and 5:
a screw nut and steering pull rod integrated electric steering device comprises a driving motor 1, a planetary roller screw 2, a hinge 3 and a steering drag rod 4.
The speed reducer is arranged in the driving motor 1, so that the structure can be simplified, and the mechanism is more compact.
An output shaft of the driving motor 1 is connected with the planetary roller screw 2.
The planetary roller screw 2 is connected to a trailing arm 4 of the vehicle via a joint 3.
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 third retainer 16, a first retainer ring 14 and a second retainer ring 15.
A first retainer ring 14 and a second retainer ring 15 are respectively arranged at two ends in the nut 10, and a third retainer 16 is arranged on the inner sides of the two retainer rings.
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.
The rollers 7 are mounted in and separated by elongated circular grooves of the cage three 16.
The first retainer ring 14 and the second retainer ring 15 can be connected with the nut 8 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 convex arc-shaped external threads are adopted on the roller 7.
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.
The working principle is as follows: when the electric steering mechanism works, the driving motor 1 drives the screw rod 10 in the planetary roller screw 2 to rotate, the planetary roller screw 2 converts the rotary motion into the linear motion of the nut 8, and the nut 8 drives the steering drag link 4 through the hinge 3 to complete the steering action.
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 (8)

1. The utility model provides a screw-nut and steering linkage integral type electric steering device, includes driving motor, planet roller lead screw, hinge and steering linkage, driving motor is inside to be provided with the reduction gear, driving motor's output shaft links to each other with planet roller lead screw, planet roller lead screw passes through the hinge and links to each other with steering linkage.
2. The feed screw nut and steering tie rod integrated electric power steering apparatus according to claim 1, characterized in that: the planet roller screw is a standard planet roller screw, the standard planet roller screw comprises a screw rod, rollers, a nut, a gear ring, a retainer and an elastic check ring, the gear ring is arranged at each of the two ends in the nut, the retainer is arranged on the outer side of the gear ring, outer gears are designed at the two ends of the rollers, the outer gears are meshed with inner teeth on the gear ring, the rollers are connected through the gear ring, holes in the rollers are connected with the retainer, the elastic check ring is designed on the outer side of the retainer, and the elastic check ring is fixed in a clamp spring groove of the nut.
3. The feed screw nut and steering tie rod integrated electric power steering apparatus according to claim 1, characterized in that: the planet roller screw is a non-standard planet roller screw, the non-standard planet roller screw comprises a screw rod, rollers, a nut, a retainer and retainer rings, the retainer rings are arranged at two ends in the nut respectively, the retainer rings are arranged on the inner sides of the retainer rings, and two ends of each roller are arranged in the long circular grooves on the corresponding retainer respectively and are separated by the retainer.
4. The feed screw nut and steering tie rod integrated electric power steering apparatus according to claim 3, characterized in that: the retainer ring and the nut can be connected through threads or can be connected through interference fit.
5. The feed screw nut and steering tie rod integrated electric power steering apparatus 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 feed screw nut and steering tie rod integrated electric power steering apparatus according to claim 2 or 3, characterized in that: by adopting a grease lubrication mode, the grease contains magnesium hydroxy silicate particles, and the particle size of the particles is less than 10 um.
7. The feed screw nut and steering tie rod integrated electric power steering apparatus according to claim 2 or 3, characterized in that: the grease lubrication mode is adopted, and the lubricating grease contains nano copper powder, nano graphite, nano calcium carbonate and nano PTFE.
8. The feed screw nut and steering tie rod integrated electric power steering apparatus according to claim 5, characterized in that: the lead screw and the nut adopt triangular threads with a tooth form angle of ninety degrees, and the roller adopts convex arc-shaped external threads.
CN202010253774.0A 2020-04-02 2020-04-02 Screw nut and steering pull rod integrated electric steering device Pending CN111391915A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010253774.0A CN111391915A (en) 2020-04-02 2020-04-02 Screw nut and steering pull rod integrated electric steering device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010253774.0A CN111391915A (en) 2020-04-02 2020-04-02 Screw nut and steering pull rod integrated electric steering device

Publications (1)

Publication Number Publication Date
CN111391915A true CN111391915A (en) 2020-07-10

Family

ID=71425106

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010253774.0A Pending CN111391915A (en) 2020-04-02 2020-04-02 Screw nut and steering pull rod integrated electric steering device

Country Status (1)

Country Link
CN (1) CN111391915A (en)

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