CN216269501U - Double-motor planetary roller screw type electric power steering gear for heavy-load commercial vehicle - Google Patents
Double-motor planetary roller screw type electric power steering gear for heavy-load commercial vehicle Download PDFInfo
- Publication number
- CN216269501U CN216269501U CN202122884576.7U CN202122884576U CN216269501U CN 216269501 U CN216269501 U CN 216269501U CN 202122884576 U CN202122884576 U CN 202122884576U CN 216269501 U CN216269501 U CN 216269501U
- Authority
- CN
- China
- Prior art keywords
- motor
- planetary roller
- steering
- double
- roller screw
- 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.)
- Active
Links
Images
Landscapes
- Power Steering Mechanism (AREA)
Abstract
The utility model relates to the technical field of automobile steering, and provides a double-motor planetary roller screw type electric power steering gear for a heavy-load commercial vehicle. The method comprises the following steps: the double-motor power-assisted steering device consists of a torque corner sensor, double motors, a speed reducing mechanism and a controller; the planetary roller screw type steering gear is provided with a planetary roller screw transmission pair and a rack and sector transmission pair, the output end of the double-motor power-assisted steering device is connected with a screw rod in the planetary roller screw transmission pair, and the rack and sector transmission pair is connected with a rocker shaft; the power-assisted torque output by the double-motor power-assisted steering device is superposed with the hand torque of the steering wheel and then output to the rocker shaft through the planet roller screw transmission pair and the rack-and-pinion transmission pair. The utility model has the beneficial effects that: when a single motor fails, the other motor can still normally act, so that the normal steering of the steering system is ensured; the steering power assistance can be shared by the two motors, and the steering pure electric requirement of the heavy-load commercial vehicle can be met under the current situation of a 24V voltage system.
Description
Technical Field
The utility model relates to the technical field of automobile steering, in particular to a double-motor planetary roller screw type electric power steering gear for a heavy-load commercial vehicle.
Background
At present, electric motor buses, large-scale new energy passenger vehicles and heavy-load commercial vehicles all adopt traditional hydraulic power-assisted steering systems in order to meet the requirements of light steering. Chinese patent CN201820019163.8 discloses a hydraulic power steering gear, which is a hydraulic power steering gear, but the oil pump of the hydraulic power steering gear operates all the time, which increases the energy consumption of the steering gear, and is not beneficial to energy saving and emission reduction, and the hydraulic system itself has oil leakage and maintenance problems, which greatly increases the maintenance cost of the steering gear, and the hydraulic oil also causes environmental pollution. In addition, the oil pump, the belt pulley, the hydraulic pipeline and other elements occupy space, are not easy to arrange, and have poor low-temperature working performance.
In addition, in order to meet the demand for electric driving, chinese patent CN200510055247.4 discloses a recirculating ball type electric power steering gear, which has been commercialized in light trucks in recent years. However, the mechanical strength of the circulating ball structure is limited, so that the requirement of the steering gear for outputting large torque cannot be met, and the circulating ball structure is difficult to be applied to heavy-load commercial vehicles.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a double-motor planetary roller screw type electric power steering gear for a heavy-duty commercial vehicle, which aims to solve the technical problems in the prior art.
In order to achieve the purpose, the utility model adopts the technical scheme that: a dual-motor planetary roller screw type electric power steering gear for a heavy-duty commercial vehicle comprises: the double-motor power-assisted steering device comprises a torque corner sensor, double motors, a speed reducing mechanism and a controller, wherein the torque corner sensor is used for acquiring hand torque and corner information of a steering wheel; the planetary roller screw type steering gear is provided with a planetary roller screw transmission pair and a rack and sector transmission pair, the output end of the double-motor power-assisted steering device is connected with a screw rod in the planetary roller screw transmission pair, the screw rod is in transmission connection with the rack and sector transmission pair, and the rack and sector transmission pair is connected with a rocker shaft; the power-assisted torque output by the double-motor power-assisted steering device is superposed with the hand torque of the steering wheel and then output to the rocker arm shaft through the planetary roller screw transmission pair and the rack-and-pinion transmission pair, and the controller controls the double motors to act according to the vehicle speed, the hand torque of the steering wheel and the corner information; when one booster motor fails, the other booster motor works.
In an alternative embodiment, a torsion bar is installed between the input shaft and the lead screw of the interconnected dual-motor power steering device, the torsion bar is connected with the input shaft through a torsion bar pin, and the torque angle sensor is sleeved on the input shaft.
In an optional embodiment, the planetary roller screw transmission pair is further provided with a roller, a nut, an inner gear ring and a roller retainer; the nut and the screw rod are coaxially installed, and two ends of the roller are sleeved in the round hole of the roller retainer and uniformly distributed around the screw rod in a planetary shape; the nut and the roller and the lead screw are meshed through threads; the outer circular surface of the nut is in sliding fit with the inner circular surface of the shell of the steering gear.
In an optional embodiment, the inner gear ring is arranged on the inner sides of the two ends of the nut, and the inner gear ring is meshed with the pinions at the two ends of the roller.
In an optional embodiment, two ends of the screw rod are arranged in a shell of the steering gear through an upper thrust self-aligning roller bearing and a lower thrust self-aligning roller bearing; and two ends of the roller retainer are respectively provided with an elastic retainer ring for limiting.
In an optional embodiment, an axial rack is processed on the outer surface of the nut, the rack is meshed with a sector gear to convert the rotary motion of the screw rod and the nut into axial linear motion, and then the sector gear shaft of the sector gear drives the rocker shaft to rotate to output torque.
In an alternative embodiment, the dual motor power steering apparatus is disposed between the torque angle sensor and the lead screw, or is disposed at a rear end of the lead screw.
In an alternative embodiment, the output end of each motor in the dual-motor power-assisted steering device is in transmission connection with the same worm wheel on the lead screw through a worm respectively, and the two motors can drive the corresponding worms simultaneously.
The utility model has the beneficial effects that:
(1) the double-motor planetary roller screw type electric power steering gear for the heavy-duty commercial vehicle adopts a power steering mode of double-motor coupling driving, realizes high-efficiency utilization of structural space and convenient maintenance, simultaneously optimizes double-motor coupling driving power assistance on a control strategy so as to output high-efficiency torque, realizes steering control and redundant safety functions required by automatic driving or auxiliary driving, and can still normally act when a single motor fails, thereby ensuring normal steering of a steering system.
(2) The double-motor planetary roller screw type electric power steering gear for the heavy-duty commercial vehicle realizes pure electric operation of a steering system of a medium-heavy-duty commercial vehicle, fully exerts the advantages of an electric power steering mechanism, provides a speed-following power-assisted function under the condition of meeting the requirement of heavy load output, and can realize light steering of low-speed large-torque output and good steering driving feeling at high speed; it should be noted that the steering assist can be shared by two motors, and can meet the steering and electric-driving requirements of a front axle and a large heavy-load commercial vehicle under the current situation of a 24V voltage system, but not generate a large current (less than or equal to 100A), the design and the circuit of the controller are feasible, and a larger voltage system, such as 48V, can be selected.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a front sectional view of the worm reduction gear of the present invention at a position below the lead screw.
Fig. 2 is a top cross-sectional view of the worm gear reduction mechanism of the present invention in a position below the lead screw.
Fig. 3 is a view showing the overall appearance of the present invention.
Fig. 4 is a front sectional view of the present invention with a dual motor and its worm gear reducer disposed above the lead screw at the lower end of the sensor.
Fig. 5 shows the structural arrangement of the double worm and single worm wheel in the utility model.
Wherein, the reference numbers in the figures are: the device comprises a torsion bar pin 1, an input shaft 2, a torsion bar 3, a sensor cover 4, a torque angle sensor 5, a steering gear upper cover 6, an upper thrust self-aligning roller bearing 7, a steering gear shell 8, a lead screw 9, a nut 10, a planetary roller 11, a roller retainer 12, an elastic retainer ring 13, a worm wheel 14, a lower thrust self-aligning roller bearing 15, a steering gear end cover 16, a flat key 17, a sector shaft 18, an inner gear ring 19, an O-shaped ring 20, an input shaft bearing 21, a sensor cover oil seal 22, a worm 23, a worm bearing 24 and a coupler 25.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly or indirectly secured to the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positions based on the orientations or positions shown in the drawings, and are for convenience of description only and not to be construed as limiting the technical solution. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "plurality" is two or more unless specifically limited otherwise.
Referring to fig. 1-5, the present embodiment provides a dual-motor planetary roller screw type electric power steering gear for heavy-duty commercial vehicles, comprising: the double-motor power-assisted steering device comprises a torque corner sensor 5, double motors, a speed reducing mechanism and a controller, wherein the torque corner sensor 5 is used for collecting hand torque and corner information of a steering wheel, the torque corner sensor 5 is a non-contact torque sensor and is integrated with an angle sensor, when the hand torque is on the steering wheel, a torsion bar 3 deforms, the torque corner sensor 5 detects a torque signal, according to a power-assisted strategy, the double-power-assisted motor is controlled to pass through a worm 23 and a worm wheel 14 speed reducing mechanism, the speed and the torque are reduced and increased, a power-assisted torque is output to be linearly superposed and acted on a lead screw 9, and the output torque and the hand torque of an electric power-assisted mechanism are coupled on the lead screw 9.
The output end of the double-motor power-assisted steering device is connected with a lead screw 9 in the planetary roller screw transmission pair, the lead screw 9 is in transmission connection with the rack-sector transmission pair, and the rack-sector transmission pair is connected with a rocker shaft; the power-assisted torque output by the double-motor power-assisted steering device is superposed with the hand torque of the steering wheel and then output to the rocker shaft through the planet roller screw transmission pair and the rack-and-pinion transmission pair, and the controller controls the double motors to act according to the vehicle speed, the hand torque of the steering wheel and the corner information; when one power-assisted motor fails, the other power-assisted motor works, a power steering mode of double-motor coupling driving is adopted, efficient utilization of structural space and convenience in maintenance are achieved, meanwhile, double-motor coupling driving power assistance is optimized on a control strategy, efficient torque output is achieved, steering control and redundant safety functions needed by automatic driving or auxiliary driving are achieved, and when a single motor fails, the other motor can still normally act, and normal steering of a steering system is guaranteed.
Specifically, a torsion bar 3 is installed between an input shaft 2 and a lead screw 9 of the interconnected dual-motor power steering device, the torsion bar 3 is connected with the input shaft 2 through a torsion bar pin 1, and a torque rotation angle sensor 5 is sleeved on the input shaft 2. The planetary roller screw transmission pair is also provided with a roller 11, a nut 10, an inner gear ring 19 and a roller retainer 12; the nut 10 and the screw rod 9 are coaxially arranged, and two ends of the roller 11 are sleeved in a circular hole of the roller retainer 12 and uniformly distributed around the screw rod 9 in a planetary shape; the nut 10 and the roller 11, and the roller 11 and the screw 9 are meshed through threads; the outer circular surface of the nut 10 is in sliding fit with the inner circular surface of the housing of the steering gear. The inner gear ring 19 is disposed inside both ends of the nut 10, and the inner gear ring 19 is engaged with the pinions at both ends of the rollers 11. Two ends of the screw rod 9 are arranged in the shell of the steering gear through an upper thrust self-aligning roller bearing 7 and a lower thrust self-aligning roller bearing 15; two ends of the roller retainer 12 are respectively provided with an elastic retainer ring 13 for limiting.
It should be noted that the outer surface of the nut 10 is provided with an axial rack, the rack is meshed with the sector gear to convert the rotary motion of the screw rod 9 and the nut 10 into axial linear motion, and the sector gear shaft 18 of the rear sector gear drives the rocker shaft to rotate to output torque. The dual-motor power steering apparatus is provided between the torque angle sensor 5 and the lead screw 9, or is disposed at the rear end of the lead screw 9. The output end of each motor in the double-motor power-assisted steering device is in transmission connection with the same worm wheel 14 on the screw rod 9 through a worm respectively.
Further, the screw 9 and the rollers 11 are in screw transmission, and the rotating rollers 11 of the screw 9 rotate and revolve, and simultaneously drive the roller holders 12 and the rollers 11 to perform revolution movement around the screw 9. Inner gear rings are processed at two ends of the nut 10 and are respectively meshed with small teeth at two ends of the planet roller 11, and the roller 11 gears are meshed with inner gear rings 19 at two ends of the nut 10, so that the parallel axis between the roller 11 and the screw rod 9 is ensured, and the roller 11 is prevented from being blocked. The nut 10 is provided with an internal thread, the planetary roller 11 and the nut 10 are in thread transmission, the outer circular surface of the nut 10 is in sliding fit with the inner circular surface of the steering gear shell to form support for the radial force of the rack, the phenomenon that the transmission is damaged due to bending deformation caused by the radial force borne by the lead screw is prevented, and the technical requirement of high-thrust rotation of the lead screw is met at two ends of the lead screw 9 through the two self-aligning thrust roller bearings 7 and 15. The outer surface of the nut 10 is provided with a rack with a large modulus, the rack is meshed with a sector on a sector shaft 18, the rotational freedom degree of the nut 10 is limited by the rack sector, and the nut 10 is ensured to only move linearly along the axial direction under the driving of the roller 11. The axial linear motion of the nut 12 drives the rack on the nut 10 to move linearly, and the rack is meshed with the sector gear 18, so that the linear reciprocating motion of the rack is converted into the rotation of the sector gear 17, and the sector gear shaft 18 is driven to rotate to output torque and rotation angle.
It is worth mentioning that as shown in fig. 4, the dual motors and their transmission mechanisms may be arranged above the screw rod in consideration of the installation of the steering gear and the space requirement of the swing arm. In order to increase the number of contact points of the worm gear and the worm, and reduce the checking strength of the worm gear and the worm, the structural form of a double-worm single-worm gear shown in the attached drawing 5 can be selected, and the worm gear material can be brass instead of a nylon material used by the conventional EPS, so that the problem of worm gear strength caused by the increase of steering torque is increased. The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A dual-motor planetary roller screw type electric power steering gear for a heavy-duty commercial vehicle comprises: a double-motor power-assisted steering device and a planetary roller screw type steering gear, which are characterized in that,
the double-motor power-assisted steering device consists of a torque corner sensor (5), double motors, a speed reducing mechanism and a controller, wherein the torque corner sensor (5) is used for acquiring hand torque and corner information of a steering wheel;
the planetary roller screw type steering gear is provided with a planetary roller screw transmission pair and a rack and sector transmission pair, the output end of the double-motor power-assisted steering device is connected with a screw (9) in the planetary roller screw transmission pair, the screw (9) is in transmission connection with the rack and sector transmission pair, and the rack and sector transmission pair is connected with a rocker shaft;
the power-assisted torque output by the double-motor power-assisted steering device is superposed with the hand torque of the steering wheel and then output to the rocker arm shaft through the planetary roller screw transmission pair and the rack-and-pinion transmission pair, and the controller controls the double motors to act according to the vehicle speed, the hand torque of the steering wheel and the corner information; when one booster motor fails, the other booster motor works.
2. The dual-motor planetary roller screw type electric power steering apparatus for heavy-duty commercial vehicles according to claim 1, wherein a torsion bar (3) is installed between the input shaft (2) and the screw (9) of the dual-motor power steering apparatus connected to each other, the torsion bar (3) is connected to the input shaft (2) through a torsion bar pin (1), and the torque rotation angle sensor (5) is fitted over the input shaft (2).
3. The dual-motor planetary roller screw type electric power steering gear for heavy-duty commercial vehicles according to claim 2, wherein the planetary roller screw transmission pair is further provided with rollers (11), a nut (10), an inner ring gear (19) and a roller holder (12); the nut (10) and the screw rod (9) are coaxially mounted, and two ends of the roller (11) are sleeved in the circular hole of the roller retainer (12) and uniformly distributed around the screw rod (9) in a planetary shape; the nut (10) and the roller (11) and the screw rod (9) are meshed through threads; the outer circular surface of the nut (10) is in sliding fit with the inner circular surface of the shell of the steering gear.
4. The dual-motor planetary roller screw type electric power steering apparatus for heavy-duty commercial vehicles according to claim 3, wherein the ring gear (19) is provided inside both ends of the nut (10), the ring gear (19) being engaged with both end pinions of the rollers (11).
5. The dual-motor planetary roller screw type electric power steering gear for heavy-duty commercial vehicles according to claim 4, wherein both ends of the screw (9) are mounted in the housing of the steering gear through an upper thrust self-aligning roller bearing (7) and a lower thrust self-aligning roller bearing (15); and two ends of the roller retainer (12) are respectively provided with an elastic retainer ring (13) for limiting.
6. The dual-motor planetary roller screw type electric power steering gear for heavy-duty commercial vehicles according to claim 3, wherein an axial rack is formed on the outer surface of the nut (10), the rack is meshed with a sector gear to convert the rotary motion of the screw (9) and the nut (10) into axial linear motion, and then a sector gear shaft (18) of the sector gear drives the rocker shaft to rotate to output torque.
7. The dual-motor planetary roller screw type electric power steering gear for heavy-duty commercial vehicles according to claim 6, wherein the dual-motor power steering device is provided between the torque angle sensor (5) and the screw (9) or is disposed at a rear end of the screw (9).
8. The dual-motor planetary roller screw type electric power steering gear for heavy-duty commercial vehicles according to claim 6, wherein the output end of each motor in the dual-motor power steering gear is in transmission connection with the same worm wheel (14) on the screw (9) through a worm respectively, and the two motors can drive the corresponding worms simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122884576.7U CN216269501U (en) | 2021-11-23 | 2021-11-23 | Double-motor planetary roller screw type electric power steering gear for heavy-load commercial vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122884576.7U CN216269501U (en) | 2021-11-23 | 2021-11-23 | Double-motor planetary roller screw type electric power steering gear for heavy-load commercial vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216269501U true CN216269501U (en) | 2022-04-12 |
Family
ID=81037527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122884576.7U Active CN216269501U (en) | 2021-11-23 | 2021-11-23 | Double-motor planetary roller screw type electric power steering gear for heavy-load commercial vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216269501U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114932945A (en) * | 2022-06-21 | 2022-08-23 | 深圳市知行智驱技术有限公司 | Wheel steering electric steering gear assembly |
| CN115432060A (en) * | 2022-10-12 | 2022-12-06 | 天津德科智控股份有限公司 | Electric power steering gear |
-
2021
- 2021-11-23 CN CN202122884576.7U patent/CN216269501U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114932945A (en) * | 2022-06-21 | 2022-08-23 | 深圳市知行智驱技术有限公司 | Wheel steering electric steering gear assembly |
| CN114932945B (en) * | 2022-06-21 | 2023-10-03 | 深圳市知行智驱技术有限公司 | Wheel steering electric steering gear assembly |
| CN115432060A (en) * | 2022-10-12 | 2022-12-06 | 天津德科智控股份有限公司 | Electric power steering gear |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN216269501U (en) | Double-motor planetary roller screw type electric power steering gear for heavy-load commercial vehicle | |
| CN110871841A (en) | Push-down electric power steering device for commercial vehicle | |
| CN112660234A (en) | Double-motor steer-by-wire system of commercial vehicle | |
| CN112249152B (en) | Electric power steering system of large commercial vehicle and control method thereof | |
| CN111284556A (en) | Circulating ball type electric power steering gear | |
| CN216185449U (en) | A drive-by-wire a steering system for heavy commercial car | |
| CN112572604A (en) | Pure electric power steering gear for heavy commercial vehicle | |
| CN113815721A (en) | A drive-by-wire a steering system for heavy commercial car | |
| CN111043301A (en) | Gear shifting device of automatic gearbox of electric vehicle | |
| CN211844609U (en) | Planetary gear type pure electric power steering gear | |
| CN109958751B (en) | Electronic gear shifting actuator | |
| CN116085428A (en) | Reverse double-output-shaft multistage speed reducer with self-locking function | |
| CN214823579U (en) | Power-assisted mechanism for commercial vehicle recirculating ball steering gear | |
| CN201071058Y (en) | Electric direction converter of vehicle | |
| CN111348096A (en) | Heavy truck electric power steering system | |
| CN111186478B (en) | Planetary gear type pure electric power steering gear | |
| CN212172340U (en) | Heavy truck electric power steering system | |
| CN204056018U (en) | A kind of screw type vehicle turning support | |
| JP2003002219A (en) | Electric power steering device | |
| CN218198476U (en) | Pure electric power-assisted steering gear for commercial heavy truck | |
| CN219969767U (en) | Pure electric power steering gear for commercial medium and heavy truck | |
| CN113147887A (en) | Pure electric steering system with safety redundancy for heavy commercial vehicle | |
| CN218198472U (en) | Electric steering gear of planet roller screw type commercial vehicle | |
| CN220577348U (en) | Steering gear and vehicle | |
| CN218177858U (en) | Servo steering engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |