CN218786022U - Electric steering actuating mechanism for steer-by-wire of commercial vehicle - Google Patents
Electric steering actuating mechanism for steer-by-wire of commercial vehicle Download PDFInfo
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- CN218786022U CN218786022U CN202222417696.0U CN202222417696U CN218786022U CN 218786022 U CN218786022 U CN 218786022U CN 202222417696 U CN202222417696 U CN 202222417696U CN 218786022 U CN218786022 U CN 218786022U
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- 230000005540 biological transmission Effects 0.000 claims description 43
- 230000003134 recirculating effect Effects 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000012545 processing Methods 0.000 abstract description 6
- 208000002925 dental caries Diseases 0.000 abstract description 2
- 239000010687 lubricating oil Substances 0.000 description 8
- 230000001050 lubricating effect Effects 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 3
- 239000004519 grease Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
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Abstract
The utility model belongs to the automobile manufacturing machinery processing field relates to an electronic steering actuating mechanism that is used for commercial car drive-by-wire to turn to, include: the steering control device comprises a shell, a motor and a steering rod, wherein an independent cavity is arranged in the shell and used for fixing an internal assembly of a steering gear; the utility model discloses poor planetary gear of few teeth connects the speed reduction that has replaced worm gear structure and has increased the round, has realized becoming a cavity with two cavitys among the prior art, has avoided simultaneously because worm gear structure, and wearing and tearing are comparatively serious, and perhaps its volume is great behind the increase worm gear modulus, occupies a large amount of spaces, wholly arranges limited problem.
Description
Technical Field
The utility model belongs to the automobile manufacturing machinery processing field relates to an electronic steering actuating mechanism that is used for commercial car steer-by-wire.
Background
Along with the development of automobile intelligent driving, the requirement for automatic driving is the basic requirement for current automobile intelligent steering, the requirement for automatic driving of a whole automobile is met, the steer-by-wire technology is a necessary way, many attempts are made on passenger vehicles in the aspect of steer-by-wire at present, however, in the aspect of commercial vehicles, research and development are in a starting stage, generally, an electric steering gear is used as a lower actuator, the traditional commercial vehicle electric steering gear is provided with an input shaft and an angle torque sensor, a product is decelerated by using a worm gear, and only a worm gear module can be increased to improve strength in order to adapt to the large torque requirement of the commercial vehicles.
However, the electric steering gear is provided with an input shaft and an angle torque sensor, so that the product space is large, and the function of the automatic angle torque sensor of the steering gear is wasted; the worm and gear speed reducing mechanism is used for a commercial vehicle, due to the worm gear structure, the abrasion is serious, the worm gear has a large volume after the worm gear modulus is increased, a large amount of space is occupied, the whole arrangement is limited, the adjustable range of the transmission ratio is small, and the requirement of large torque output cannot be met; and the worm gear structure of the traditional electric steering upper speed reduction part and the circulating ball rack at the lower part are reduced into two cavities, two shells are needed to meet the requirements, and the cost of processing parts is high.
Therefore, an electric steering actuator with small space volume, suitable for steering under severe conditions with high torque and high strength of a commercial vehicle is needed to solve the problems.
Disclosure of Invention
The utility model provides a technical scheme that technical problem took is: an electric power steering actuator for steer-by-wire of a commercial vehicle, comprising: the steering control device comprises a shell, a motor and a steering rod, wherein an independent cavity is arranged in the shell and used for fixing an internal assembly of a steering gear;
the steering gear comprises an internal gear, an adjusting nut, a screw external nut and a sector gear, wherein an inner hole of the internal gear is sleeved on an output shaft of a motor, the internal gear is meshed with the inner gear ring of the adjusting nut, the outer circumference of the adjusting nut is fixedly connected with the inner cavity of a shell, the screw external nut is sleeved on the outer circumference of the screw, a spur rack is axially arranged on the outer side of the circumference of the screw external nut, the spur rack is meshed with the sector gear, the sector gear is fixedly connected with a steering rod, and a rotating shaft of the sector gear is superposed with a rotating shaft of the steering rod;
the output shaft of the motor and the rotating shaft of the steering rod both extend into the shell;
the rotating shaft of the internal gear and the rotating shaft of the screw rod are eccentrically arranged, and the internal gear is connected with the screw rod through a small-tooth-difference planetary gear after being meshed with the adjusting nut; the connection of the planetary gear with less tooth difference replaces the speed reduction and torque increase of a worm gear structure, so that two cavities in the prior art are changed into one cavity, and the problems that the abrasion is serious due to the worm gear structure, or the volume is large after the worm gear module is increased, a large amount of space is occupied, and the whole arrangement is limited are solved; meanwhile, a sensor part of an electric circulating ball in the prior art is removed, a motor controller assembly is used as power and control of the whole execution system, the whole system receives information such as torque, angle and vehicle speed of an upper computer, and an angle sensor of the motor is used for feeding back state information of a steering execution part;
the two ends of the screw rod 6 are respectively provided with a first bearing for connecting the inner cavity of the shell in a rotating manner, and the output shaft of the motor is sleeved with a second bearing for connecting the inner cavity of the shell in a rotating manner.
Preferably, the outer end face of the internal gear facing the screw rod is provided with a plurality of drive pins which are uniformly distributed in an annular mode along the axial direction, the end face of the screw rod facing the internal gear is provided with a plurality of drive holes which are uniformly distributed in an annular mode, and the drive pins stretch into the drive holes.
Preferably, a plurality of annularly and uniformly distributed transmission holes are axially formed in the outer end face, facing the screw rod, of the inner gear, and a plurality of annularly and uniformly distributed transmission pins are arranged on the end face, facing the inner gear, of the screw rod and extend into the transmission holes.
More excellent, the transmission round pin is three with the transmission hole, and three transmission round pin can satisfy the planet wheel of cooperation inner gear with the transmission hole, and the inner gear drives the screw rod, and with the cooperation of adjusting nut, reduces speed as few poor planetary gear reduction gears of tooth and increases the turn round, can realize the optimization combination that the processing cost is low simultaneously.
Preferably, the screw rod is connected with the screw rod outer nut through a ball screw.
Preferably, the ball screw connection between the screw and the screw nut is a circulating ball speed reduction screw connection.
Preferably, the first bearing is a tapered roller bearing assembled in a reverse pairing mode, and the axial stress of the screw can be effectively eliminated through the reverse pairing installation of the tapered roller bearing.
Preferably, lubricating oil is added into the inner cavity of the shell, only the lubricating oil needs to be added into the shell, the upper cavity and the lower cavity of the integral structure of the electric steering actuating mechanism in the prior art are not needed, the lubricating modes of the upper cavity and the lower cavity are different, the ball screw rack structure is suitable for being lubricated by gear lubricating oil, and the worm gear part is suitable for using lubricating grease, so that the maintenance is simpler and more convenient.
Preferably, the inner gear and the inner gear ring of the adjusting nut are standard teeth; the inner gear and the inner gear ring of the adjusting nut are standard gears, only one eccentric displacement is performed to eliminate interference, and the gear is low in manufacturing cost and simple to machine.
The beneficial effects of the utility model are that:
1. the utility model has the advantages that under the same output torque requirement, the volume of the small-tooth-difference planetary gear structure is reduced by more than 20% compared with the worm gear structure in the prior art, a large amount of steering peripheral space is saved, the small-tooth-difference planetary gear structure can be used for arranging other parts, and the whole vehicle is relatively more flexibly arranged;
2. the utility model uses the planetary gear speed reducing mechanism with less tooth difference, and the strength is improved by times compared with the strength under the condition of the same volume and the same transmission ratio, thereby meeting the large torque requirement of the commercial vehicle;
3. the utility model discloses the reduction gears drive ratio adjustable range of whole product is big, can satisfy the output demand of the commercial car of different loads.
4. The utility model discloses among the poor planetary gear structure of few tooth, gear structure is simple, and the technology is ripe, and the cost of manufacture is low, compares in worm gear, and the cost is lower, and it is more convenient to assemble.
5. The planetary gear transmission with less tooth difference of the utility model is gear transmission, the efficiency can reach 80-90 percent, and the structure is greatly improved compared with the traditional worm gear structure;
6. the utility model discloses in, the reduction gears of whole product can use same kind of gear lubricating oil to lubricate in a cavity, and traditional worm gear structure, worm gear reduction gears and recirculating ball reduction gears are two cavities, adopt lubricating grease and lubricating oil lubrication, consequently the utility model discloses greatly reduced the manufacturing degree of difficulty and the maintenance degree of difficulty.
Drawings
FIG. 1 is an axial cross-section of an electric steering actuator for steer-by-wire of a commercial vehicle;
FIG. 2 is a left side axial cross-sectional view;
FIG. 3 is a rearward axial section;
FIG. 4 is an axial sectional view of a reduction mechanism with small tooth difference;
fig. 5 is a radial sectional view of the small tooth difference speed reducing mechanism.
Wherein, 1, a shell; 2. a motor; 3. a steering lever; 4. an internal gear; 5. adjusting the nut; 6. a screw; 7. an outer nut; 8. a sector gear; 9. straight rack; 10. a first bearing; 11. a second bearing; 12. a drive pin; 13. and a transmission hole.
Detailed Description
The related art in the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is to be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1 to 5, an electric steering actuator for steer-by-wire of a commercial vehicle includes: the steering control device comprises a shell 1, a motor 2 and a steering rod 3, wherein an independent cavity is arranged in the shell 1 and used for fixing steering gear internal components, and the motor 2 inputs power into the shell 1, then the power is transmitted to the steering rod 3 after being decelerated and torque-increased by the steering gear internal components, so that the steering control of the commercial vehicle is realized;
the steering gear comprises an internal gear 4, an adjusting nut 5, a screw 6, an external screw nut 7 and a sector gear 8, wherein an inner hole of the internal gear 4 is sleeved on an output shaft of the motor 2, the internal gear 4 is meshed with an inner gear ring of the adjusting nut 5, the outer circumference of the adjusting nut 5 is fixedly connected with an inner cavity of the shell 1, the external screw nut 7 is sleeved on the outer circumference of the screw 6, a spur rack 9 is axially arranged on the outer circumference of the external screw nut 7, the spur rack 9 is meshed with the sector gear 8, the sector gear 8 is fixedly connected with the steering rod 3, and a rotating shaft of the sector gear 8 is superposed with a rotating shaft of the steering rod 3;
the output shaft of the motor 2 and the rotating shaft of the steering rod 3 both extend into the shell 1;
the rotating shaft of the internal gear 4 and the rotating shaft of the screw 6 are eccentrically arranged, and the internal gear 4 is connected with the screw 6 through a small-tooth-difference planetary gear after being meshed with the adjusting nut 5; the connection of the planetary gear with less tooth difference replaces the speed reduction and torque increase of a worm gear structure, so that two cavities in the prior art are changed into one cavity, and the problems that the abrasion is serious due to the worm gear structure, or the volume is large after the worm gear module is increased, a large amount of space is occupied, and the whole arrangement is limited are solved; meanwhile, a sensor part of an electric circulation ball in the prior art is removed, a motor 2 controller assembly is used as power and control of the whole execution system, the whole system receives information such as torque, angle and vehicle speed of an upper computer, and an angle sensor of the motor 2 is used for feeding back state information of a steering execution part;
the two ends of the screw rod 6 are respectively provided with a first bearing 10 for the screw rod 6 to rotate to be connected with the inner cavity of the shell 1, and the output shaft of the motor 2 is sleeved with a second bearing 11 for the inner gear 4 to rotate to be connected with the inner cavity of the shell 1.
Furthermore, a plurality of annularly and uniformly distributed transmission pins 12 are axially arranged on the outer end face of the internal gear 4 facing the screw rod 6, a plurality of annularly and uniformly distributed transmission holes 13 are arranged on the end face of the screw rod 6 facing the internal gear 4, and the transmission pins 12 extend into the transmission holes 13.
Furthermore, a plurality of annularly and uniformly distributed transmission holes 13 are axially formed in the outer end face, facing the screw rod 6, of the internal gear 4, a plurality of annularly and uniformly distributed transmission pins 12 are arranged on the end face, facing the internal gear 4, of the screw rod 6, and the transmission pins 12 extend into the transmission holes 13.
Furthermore, the transmission pins 12 and the transmission holes 13 are three, the three transmission pins 12 and the transmission holes 13 can meet the requirement of matching with the planet gears of the inner gear 4, the inner gear 4 drives the screw rod 6 to be matched with the adjusting nut 5, the reduction and torque increase are carried out as a small-tooth-difference planet gear speed reducing mechanism, and meanwhile, the optimized combination with low processing cost can be realized.
Further, the screw 6 is connected with the screw nut 7 through a ball screw.
Furthermore, the ball screw connection between the screw 6 and the screw nut 7 is a recirculating ball retarding screw connection.
Furthermore, the first bearing 10 is a tapered roller bearing assembled in a reverse pairing manner, and the axial stress of the screw 6 can be effectively eliminated by the reverse pairing installation of the tapered roller bearing.
Furthermore, lubricating oil is added into the inner cavity of the shell 1, only the lubricating oil needs to be added into the shell 1, the upper cavity and the lower cavity of the whole structure of the electric steering actuating mechanism in the prior art are not needed, the lubricating modes of the upper cavity and the lower cavity are different, the ball screw rack structure is suitable for being lubricated by gear lubricating oil, and the worm gear part is suitable for using lubricating grease, so that the maintenance is simpler and more convenient.
Furthermore, the inner gear 4 and the inner gear ring of the adjusting nut 5 are standard teeth; the inner gear 4 and the inner gear rings of the adjusting nut 5 are standard gears, only one eccentric displacement is performed to eliminate interference, and the manufacturing cost is low and the processing is simple.
Examples
The embodiment removes an input shaft part on the basis of a traditional electric mechanical circulating ball steering gear, simultaneously removes a sensor part of an electric circulating ball, and is used for an actuating mechanism of a commercial vehicle for steer-by-wire.
As shown in the figure, the steering gear is a steering execution part of steer-by-wire, wherein the first bearing 10 is a tapered roller bearing, the first bearings 10 at the upper end and the lower end of the screw rod 6 are reversely matched and used for fixing a ball screw assembly, compared with a traditional thrust ball bearing, the first bearing 10 has stronger bearing capacity and is more suitable for the large-load working condition of a commercial vehicle, the steering gear shell 1 is used for fixing internal parts of the steering gear, the screw rod 6 and the outer nut 7 are screw rod and nut assemblies of the steering gear, the upper end of the screw rod 6 is provided with three transmission pins 12, a matching piece is provided with a planetary wheel of an inner gear 4 with a transmission hole 13, the inner gear 4 drives the screw rod 6 to be matched with an adjusting nut 5 with an outer gear ring to serve as a small-tooth-difference planetary gear speed reducing mechanism to reduce speed and increase torque, and a spur rack 9 at the outer side of the outer nut 7 is matched with a sector of a sector gear 8 to serve as a circulating ball speed reducing mechanism to transmit torque; the second bearing 11 supports the internal gear 4, and the motor 2 controller subassembly is a power source of the whole product.
In this embodiment, the overall product transmission ratio is as follows:
i＝i1*i2
wherein i1 is the transmission ratio of the planetary gear with small tooth difference, i1= Z1/(Z2-Z1), Z1 is the tooth number of the outer gear, and Z2 is the tooth number of the inner gear, so that the smaller Z2-Z1 is, the larger the system transmission ratio is, the transmission ratio range can be from 10-1000, and the adjustment range is large.
i2 is the transmission ratio of the recirculating ball steering gear, i2=2 pi Rf/T, wherein Rf is the sector pitch radius and T is the pitch of the ball screw, where the size is affected by the overall space of the product, typically adjusted within the range of 17-22.5.
Taking a conventional electric power steering device for a commercial vehicle as an example, the transmission ratio i = i1 × i2, i1 ranges from 19 to 21, i2 assumes a constant value of 20, and the total transmission ratio is 380 to 420, the 6n.m motor is used as a power source, and the maximum output force is Tn =6 × 420 × 0.85 × 0.75=1660n.m.
In the same space, i1 of the utility model ranges from 20 to 30, i2 is still set to 20, the total transmission ratio is 400 to 600N.m, and the diameter is increased properly to obtain a larger transmission ratio. Still setting motor 6n.m, its maximum output force 6 x 600 x 0.85 x 0.75=2295n.m.
To sum up, the utility model provides an electronic steering actuator for commercial car steer-by-wire, the poor planetary gear of few teeth connects the speed reduction that has replaced the worm gear structure and has increased the turn round, has realized becoming a cavity with two cavitys among the prior art, has avoided simultaneously because the worm gear structure, and wearing and tearing are comparatively serious, and its is bulky behind the perhaps increase worm gear modulus, occupy a large amount of spaces, wholly arrange limited problem, consequently the utility model discloses possess extensive application prospect.
It is to be emphasized that: the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form, and any simple modifications, equivalent changes and modifications made by the technical spirit of the present invention to the above embodiments are all within the scope of the technical solution of the present invention.
Claims (7)
1. An electric power steering actuator for steer-by-wire of a commercial vehicle, comprising: the steering control device comprises a shell (1), a motor (2) and a steering rod (3), wherein an independent cavity is arranged in the shell (1) and used for fixing steering gear internal components, and the motor (2) inputs power into the shell (1), then the power is transmitted to the steering rod (3) after being decelerated and torque-increased by the steering gear internal components, so that the steering control of the commercial vehicle is realized;
the steering gear comprises an inner gear (4), an adjusting nut (5), a screw (6), an outer nut of the screw (7) and a sector gear (8), wherein an inner hole of the inner gear (4) is sleeved on an output shaft of a motor (2), the inner gear (4) is meshed with an inner gear ring of the adjusting nut (5), an outer circumference of the adjusting nut (5) is fixedly connected with an inner cavity of a shell (1), the outer nut of the screw (7) is sleeved on an outer circumference of the screw (6), a spur rack (9) is axially arranged on the outer side of the circumference of the outer nut of the screw (7), the spur rack (9) is meshed with the sector gear (8), the sector gear (8) is fixedly connected with a steering rod (3), and a rotating shaft of the sector gear (8) is coincided with a rotating shaft of the steering rod (3);
the output shaft of the motor (2) and the rotating shaft of the steering rod (3) both extend into the shell (1);
the rotating shaft of the internal gear (4) and the rotating shaft of the screw (6) are eccentrically arranged, and the internal gear (4) is connected with the screw (6) through a small-tooth-difference planetary gear after being meshed with the adjusting nut (5);
two ends of the screw rod (6) are respectively provided with a first bearing (10) for the screw rod (6) to be rotatably connected with the inner cavity of the shell (1), and an output shaft of the motor (2) is sleeved with a second bearing (11) for the inner gear (4) to be rotatably connected with the inner cavity of the shell (1);
a plurality of annularly and uniformly distributed transmission pins (12) are axially arranged on the outer end face of the internal gear (4) facing the screw rod (6), a plurality of annularly and uniformly distributed transmission holes (13) are formed in the end face of the screw rod (6) facing the internal gear (4), and the transmission pins (12) extend into the transmission holes (13); or, internal gear (4) are equipped with transmission hole (13) of a plurality of annular equipartitions along the axial on the outer terminal surface towards screw rod (6), screw rod (6) are equipped with transmission round pin (12) of a plurality of annular equipartitions towards the terminal surface of internal gear (4), transmission round pin (12) stretch into in transmission hole (13).
2. An electric steering actuator for by-wire steering of a commercial vehicle according to claim 1, characterized in that the number of the driving pins (12) and the driving holes (13) is three.
3. An electric steering actuator for by-wire steering of a commercial vehicle according to claim 1, characterized in that the screw (6) is in a ball screw connection with the screw nut (7).
4. An electric steering actuator for steering-by-wire of a commercial vehicle according to claim 3, characterised in that the ball screw connection between the screw (6) and the screw nut (7) is a recirculating ball reduction screw connection.
5. An electric steering actuator for by-wire steering of a commercial vehicle according to claim 1, characterized in that the first bearing (10) is a reverse mating-fitted tapered roller bearing.
6. The electric steering actuator for steering-by-wire of a commercial vehicle according to claim 1, characterized in that the housing (1) is internally lubricated.
7. The electric steering actuator for steering-by-wire of a commercial vehicle according to claim 1, characterized in that the inner gear (4) and the inner gear of the adjusting nut (5) are standard teeth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222417696.0U CN218786022U (en) | 2022-09-13 | 2022-09-13 | Electric steering actuating mechanism for steer-by-wire of commercial vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222417696.0U CN218786022U (en) | 2022-09-13 | 2022-09-13 | Electric steering actuating mechanism for steer-by-wire of commercial vehicle |
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| Publication Number | Publication Date |
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| CN218786022U true CN218786022U (en) | 2023-04-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222417696.0U Active CN218786022U (en) | 2022-09-13 | 2022-09-13 | Electric steering actuating mechanism for steer-by-wire of commercial vehicle |
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| CN (1) | CN218786022U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116923527A (en) * | 2023-09-15 | 2023-10-24 | 豫北转向系统(新乡)股份有限公司 | Steering actuator of commercial vehicle by wire |
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2022
- 2022-09-13 CN CN202222417696.0U patent/CN218786022U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116923527A (en) * | 2023-09-15 | 2023-10-24 | 豫北转向系统(新乡)股份有限公司 | Steering actuator of commercial vehicle by wire |
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| TR01 | Transfer of patent right |
Effective date of registration: 20240116 Address after: 710021 No.1 Shaanqi Avenue, Jingwei Industrial Park, Xi'an Economic and Technological Development Zone, Shaanxi Province Patentee after: Shaanxi Dezhen Component Technology Co.,Ltd. Address before: 710200 No.11, Changqing East Road, Jinghe Industrial Park, Gaoling District, Xi'an City, Shaanxi Province Patentee before: SHAANXI WANFANG AUTO PARTS Co.,Ltd. |
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