CN112572604A - Pure electric power steering gear for heavy commercial vehicle - Google Patents
Pure electric power steering gear for heavy commercial vehicle Download PDFInfo
- Publication number
- CN112572604A CN112572604A CN202110099304.8A CN202110099304A CN112572604A CN 112572604 A CN112572604 A CN 112572604A CN 202110099304 A CN202110099304 A CN 202110099304A CN 112572604 A CN112572604 A CN 112572604A
- Authority
- CN
- China
- Prior art keywords
- steering
- gear
- steering gear
- screw
- roller
- 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
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 19
- 230000007246 mechanism Effects 0.000 claims description 10
- 238000009434 installation Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
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
- B62D3/00—Steering gears
- B62D3/02—Steering gears mechanical
- B62D3/04—Steering gears mechanical of worm type
- B62D3/06—Steering gears mechanical of worm type with screw and nut
-
- 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
- B62D5/0448—Ball nuts
-
- 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
- B62D5/0454—Worm gears
-
- 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
- B62D5/0457—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such
- B62D5/046—Controlling the motor
- B62D5/0463—Controlling the motor calculating assisting torque from the motor based on driver input
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Steering Mechanism (AREA)
Abstract
A pure electric power-assisted steering gear for a heavy commercial vehicle comprises an electric control steering unit and a roller screw type mechanical steering gear; the roller screw type mechanical steering gear comprises a screw transmission pair consisting of a screw, a nut, a roller, an inner gear ring, a planet carrier and a retainer ring, wherein two ends of the screw on the screw transmission pair are supported and fixed in a shell of the roller screw type mechanical steering gear by bearings, one end of a steering arm shaft is meshed with the nut through a gear, and the other end of the steering arm shaft is connected with the output end of the steering gear to transmit torque; the electric control steering unit is connected with the roller screw type mechanical steering gear shell through a valve body by a bolt; the worm wheel shaft of the electric control steering unit is rigidly connected with the lead screw of the lead screw transmission pair through a spline to transmit torque. The hydraulic power assisting device cancels a hydraulic power assisting system, and is convenient to install, compact in structure and accurate in operation and control.
Description
Technical Field
The invention relates to an automobile steering system, in particular to a pure electric steering gear of a heavy commercial vehicle.
Background
The cancellation of the fuel engine plays a positive promoting role in the development of intelligent driving technology. In addition, the implementation of the Chinese 'double-point' policy on landing will force each host factory to accelerate the transition to the electrification strategy, and further promote the rapid development of the intelligent driving technology. Heavy-duty commercial car front axle load is big, and the present domestic batch use is hydraulic pressure circulation ball formula power steering ware. The steering gear of the type has no electric control steering unit and cannot meet the requirement of intelligent driving. Therefore, a plurality of manufacturers develop an electric control hydraulic circulating ball power-assisted steering system in China, and an electric control unit is integrated on the basis of the traditional hydraulic circulating ball power-assisted steering device, so that the requirement of electric control steering is preliminarily met. The power output of the electric control hydraulic circulating ball type power steering gear is from a hydraulic system, the electric control part is used as an auxiliary mechanism to open a hydraulic rotary valve to improve the hand power of a driver, and meanwhile, the electric control hydraulic circulating ball type power steering gear can be matched with a whole vehicle to develop some intelligent driving functions. The electric control hydraulic circulating ball power-assisted steering gear has natural defects due to the structural limitation that in the steering executing process, hydraulic pressure is taken as a power source and is non-clean energy, and the hydraulic circulating ball power-assisted steering gear also needs to face the fault phenomena of external leakage, card issuing and the like which are frequently encountered by the hydraulic circulating ball steering gear; in intelligent driving control, the delay of hydraulic assistance and the oil resistance of a cavity cannot meet the increasing requirements on the timeliness and the accuracy of steering. The output capacity of a common mechanical steering gear is limited, the load requirement of a heavy commercial vehicle cannot be met, and the installation arrangement form of the steering gear is not expected to be changed greatly on the whole vehicle.
Disclosure of Invention
The invention provides a pure electric power steering gear which can be suitable for heavy commercial vehicles, a hydraulic power system is omitted, spatial arrangement is more convenient, meanwhile, the pure electric power steering gear directly outputs torque through a motor, the torque is more accurate and direct after being decelerated and amplified to an output end, and the whole device is convenient to install, compact in structure and accurate in operation and control.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the utility model provides a pure electric power assisted steering ware that heavy commercial vehicle used which characterized in that:
comprises an electric control steering unit and a roller screw type mechanical steering gear;
the roller screw type mechanical steering gear comprises a screw transmission pair consisting of a screw, a nut, a roller, an inner gear ring, a planet carrier and a retainer ring, wherein two ends of the screw on the screw transmission pair are supported and fixed in a shell of the roller screw type mechanical steering gear by bearings, one end of a steering arm shaft is meshed with the nut through a gear, and the other end of the steering arm shaft is connected with the output end of the steering gear to transmit torque; the electric control steering unit is connected with the roller screw type mechanical steering gear shell through a valve body by a bolt; the worm wheel shaft of the electric control steering unit is rigidly connected with the lead screw of the lead screw transmission pair through a spline to transmit torque.
The automatically controlled steering unit of automatically controlled steering unit still includes: the device comprises an input shaft, a cylindrical pin, a torsion bar, a sensor shell, a sensor stator, a sensor rotor, a middle shell, a bearing seat, a worm-gear shaft, a motor controller assembly and a wiring harness assembly; the worm and gear speed reducing mechanism comprises a worm and a worm wheel, the worm and gear speed reducing mechanism is installed in a middle shell, the worm wheel is pressed on a worm wheel shaft in an interference fit mode, a sensor stator is welded on an input shaft, a sensor rotor is welded on the worm wheel shaft, one end of a torsion bar is pressed into the worm wheel shaft in an interference fit mode, the other end of the torsion bar is rigidly fixed with the input shaft through a cylindrical pin, the input shaft is connected with a steering column, a motor controller assembly is connected with the middle shell through three bolts, one end of a wiring harness assembly is connected with a sensor, the other end of the wiring harness assembly is connected with the motor controller, the wiring harness assembly is fixed on the middle shell through a wiring.
The invention has the following benefits:
1. according to the invention, the screw transmission pair is installed in the conventional hydraulic steering gear, a hydraulic power-assisted system is removed on the premise of not changing the installation and input/output modes of the steering gear, power is provided for the steering gear through the electric control steering unit, the output torque of the hydraulic steering gear of the heavy commercial vehicle can be provided, the output torque per unit mass is larger, the structure is more compact, and the assembly performance of the whole vehicle is very high. And compared with a circulating ball hydraulic power steering gear and an electric control hydraulic circulating ball steering gear, the steering gear has obvious advantages in noise and environmental pollution.
2. The structure is pure electromechanical transmission, the screw rod, the nut and the roller of the planetary roller screw rod type mechanical steering gear are in rolling friction, the transmission efficiency is high, the response time and the precision are higher than those of an electric control hydraulic steering system under various working conditions of intelligent auxiliary driving (such as lane keeping based on torque control, automatic parking and the like), and the performance of the product can be greatly improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a partial structure of a worm and motor controller assembly;
fig. 3 is a schematic structural diagram of a lead screw transmission pair.
Detailed Description
The invention is further explained below with reference to the drawings and the embodiments.
Referring to fig. 1-3, a pure electric power steering gear for a heavy commercial vehicle includes an electric control steering unit, a roller screw type mechanical steering gear;
the roller screw type mechanical steering gear comprises a screw transmission pair consisting of a screw 14, a nut 15, a roller 17, an inner gear ring 18, a planet carrier 19 and a retainer ring 20, wherein two ends of the screw 14 on the screw transmission pair are supported and fixed in a shell 23 of the roller screw type mechanical steering gear by bearings, the screw 14 is connected with the nut 15 through the roller 17, two ends of the roller 17 are provided with external gear structures, an external gear is meshed with the inner gear ring 18, the inner gear ring 18 is pressed in an inner hole of the nut 15, the planet carrier 19 is arranged in the inner hole of the inner gear ring 18, the roller 17 is connected with an inner hole on the planet carrier 19, the planet carrier 19 is axially limited through the retainer ring 20 arranged in a snap spring groove of the inner gear ring, the nut 15 and a steering arm shaft 16 are a pair of. One end of a steering arm shaft 16 is meshed with the nut 15 through a gear, the other end of the steering arm shaft is connected with the output end of the steering gear, and the linear motion of the nut 15 is converted into reciprocating swing through the steering arm shaft 16 so as to transmit torque.
The electric control steering unit is connected with the roller screw type mechanical steering gear shell 23 through the valve body 12 by bolts; the electric control steering unit comprises a worm and gear speed reducing mechanism, wherein a worm gear shaft 11 of the worm and gear speed reducing mechanism is rigidly connected with a lead screw 14 of a lead screw transmission pair through a spline to transmit torque.
The automatically controlled steering unit of automatically controlled steering unit still includes: the sensor comprises an input shaft 1, a cylindrical pin 2, a torsion bar 3, a sensor shell 4, a sensor stator 5, a sensor rotor 6, a middle shell 7, a bearing seat 8, a worm wheel shaft 11, a motor controller assembly 21 and a wiring harness assembly 22; the worm and gear speed reducing mechanism comprises a worm 9 and a worm wheel 10, the worm and gear speed reducing mechanism is installed in a middle shell 7, the worm wheel 10 is pressed on a worm wheel shaft 11 in an interference fit mode, a sensor stator 5 is welded on an input shaft 1, a sensor rotor 6 is welded on the worm wheel shaft 11, one end of a torsion bar 3 is pressed into the worm wheel shaft 11 in an interference fit mode, the other end of the torsion bar is rigidly fixed with the input shaft 1 through a cylindrical pin 2, the input shaft 1 is connected with a steering column, a motor controller assembly 21 is connected with the middle shell 7 through three bolts, one end of a wiring harness assembly 22 is connected with a sensor, the other end of the wiring harness assembly is connected with the motor controller 21, the wiring harness assembly 22 is fixed on the middle shell 7 through a wiring harness connector, the.
In the normal steering mode, when the driver turns the steering wheel, torque is transmitted to the input shaft 1 through the steering column, the input shaft 1 and the worm shaft 11 generate relative rotational movement, the relative change causes a change in the magnetic field distribution between the stator and rotor of the sensor, which the sensor interprets as an input torque value, the torque is transmitted to the motor controller assembly 21 through the wire harness assembly, the motor controller assembly 21 controls the motor to output a certain torque according to the input torque signal and the internally stored power-assisted parameter, the torque is transmitted to a worm wheel 10 through the connection of a worm 9 and a motor, the worm wheel 10 is transmitted to a worm wheel shaft 11, the worm wheel shaft 11 transmits the torque to a lead screw 14 through spline connection, the lead screw 14 transmits the torque to a nut 15 through a roller 17, and the torque of the nut 15 is converted into reciprocating swing of a steering arm shaft 16 through sector meshing so as to be transmitted to the output end of the steering gear.
In the advanced intelligent auxiliary driving mode, after receiving an angle or torque control instruction sent by an upper-layer vehicle controller, the motor controller assembly 21 outputs a torque matched with the control strategy according to the control strategy, the torque is transmitted to the worm gear shaft 11 through the worm gear reduction mechanism, the worm gear shaft 11 transmits the torque to the lead screw 14 through spline connection, the lead screw 14 transmits the torque to the nut 15 through the roller 17, and the torque of the nut 15 is converted into reciprocating swing of the steering arm shaft 16 to an output end through sector meshing. Meanwhile, a sensor module of the electric control steering unit can synchronously feed back the torque and angle conditions of the current steering gear to an upper-layer vehicle control unit, and adjust a target angle or torque in time, so that closed-loop control of a steering layer is realized.
According to the invention, the screw rod transmission pair is arranged in the steering gear, and on the premise of not changing the installation size and the input and output forms of the steering gear, the bearing body steel balls of the screw rod and the nut of the conventional hydraulic circulating ball steering gear are designed into the roller, and the bearing capacity of the conventional hydraulic steering gear is more than 3 times of that of the conventional hydraulic steering gear under the same specification. The roller, the screw rod and the nut are in threaded fit respectively, the roller is distributed in a planetary mode in the circumferential direction of the screw rod, the outer gears at two ends of the roller are meshed with the inner gear rings respectively, the roller is guaranteed to be parallel to the axis of the screw rod, and the transmission stability is improved. The inner holes of the planet carrier are uniformly distributed and matched with the cylindrical parts at the two ends of the rollers, so that the rollers are uniformly distributed in the circumferential direction of the screw rod. The inner gear ring is pressed into the inner hole of the nut in an interference manner, the planet carrier is in clearance fit with the inner hole of the inner gear ring, and the axial limiting is carried out through the retainer ring.
The axial force and the radial force generated in the process of transmitting torque by the planetary roller screw pair are very large, the diameter of a screw rod of the planetary roller screw pair is much smaller than that of a screw rod of a conventional hydraulic circulating ball power steering gear and an electric control hydraulic circulating ball steering gear, and the existing standard series bearings supported at two ends of the screw rod can not meet the requirements of dynamic load and static load or can not be installed and used due to the fact that the size of an inner hole of the bearing is large although the requirements of the dynamic load and the static load are met. On the premise of meeting the bearing requirement, the invention specially designs the standard tapered roller bearing, and the size of the inner hole of the bearing is properly reduced so as to meet the matching installation of the bearing and the lead screw.
The screw transmission pair is combined with the electric control steering unit, and the function of canceling a hydraulic system of a traditional steering gear can be achieved. Therefore, the steering gear is simpler in structure and more accurate in steering control.
Claims (2)
1. The utility model provides a pure electric power assisted steering ware that heavy commercial vehicle used which characterized in that:
comprises an electric control steering unit and a roller screw type mechanical steering gear;
the roller screw type mechanical steering gear comprises a screw transmission pair consisting of a screw, a nut, a roller, an inner gear ring, a planet carrier and a retainer ring, wherein two ends of the screw on the screw transmission pair are supported and fixed in a shell of the roller screw type mechanical steering gear by bearings, one end of a steering arm shaft is meshed with the nut through a gear, and the other end of the steering arm shaft is connected with the output end of the steering gear to transmit torque; the electric control steering unit is connected with the roller screw type mechanical steering gear shell through a valve body by a bolt; the worm wheel shaft of the electric control steering unit is rigidly connected with the lead screw of the lead screw transmission pair through a spline to transmit torque.
2. A pure electric power steering gear for heavy commercial vehicles according to claim 1, characterized in that: the automatically controlled steering unit of automatically controlled steering unit still includes: the device comprises an input shaft, a cylindrical pin, a torsion bar, a sensor shell, a sensor stator, a sensor rotor, a middle shell, a bearing seat, a worm-gear shaft, a motor controller assembly and a wiring harness assembly; the worm and gear speed reducing mechanism comprises a worm and a worm wheel, the worm and gear speed reducing mechanism is installed in a middle shell, the worm wheel is pressed on a worm wheel shaft in an interference fit mode, a sensor stator is welded on an input shaft, a sensor rotor is welded on the worm wheel shaft, one end of a torsion bar is pressed into the worm wheel shaft in an interference fit mode, the other end of the torsion bar is rigidly fixed with the input shaft through a cylindrical pin, the input shaft is connected with a steering column, a motor controller assembly is connected with the middle shell through three bolts, one end of a wiring harness assembly is connected with a sensor, the other end of the wiring harness assembly is connected with the motor controller, the wiring harness assembly is fixed on the middle shell through a wiring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110099304.8A CN112572604A (en) | 2021-01-25 | 2021-01-25 | Pure electric power steering gear for heavy commercial vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110099304.8A CN112572604A (en) | 2021-01-25 | 2021-01-25 | Pure electric power steering gear for heavy commercial vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112572604A true CN112572604A (en) | 2021-03-30 |
Family
ID=75145721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110099304.8A Pending CN112572604A (en) | 2021-01-25 | 2021-01-25 | Pure electric power steering gear for heavy commercial vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112572604A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113602349A (en) * | 2021-07-27 | 2021-11-05 | 十堰安联汽车零部件有限公司 | Mechanical structure of electric control hydraulic power-assisted steering gear |
| CN115285212A (en) * | 2022-07-04 | 2022-11-04 | 安徽德孚转向***股份有限公司 | R-EPS pure electric power steering gear for commercial vehicle |
| CN115432060A (en) * | 2022-10-12 | 2022-12-06 | 天津德科智控股份有限公司 | Electric power steering gear |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109625081A (en) * | 2018-12-27 | 2019-04-16 | 沙市久隆汽车动力转向器有限公司 | A kind of intelligent mixed power diverter applied to commercial vehicle |
| CN208868130U (en) * | 2018-09-27 | 2019-05-17 | 天津市松正电动汽车技术股份有限公司 | A kind of electric booster steering device and commercial vehicle |
| CN110871841A (en) * | 2019-12-16 | 2020-03-10 | 北京理工大学 | Push-down electric power steering device for commercial vehicle |
-
2021
- 2021-01-25 CN CN202110099304.8A patent/CN112572604A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208868130U (en) * | 2018-09-27 | 2019-05-17 | 天津市松正电动汽车技术股份有限公司 | A kind of electric booster steering device and commercial vehicle |
| CN109625081A (en) * | 2018-12-27 | 2019-04-16 | 沙市久隆汽车动力转向器有限公司 | A kind of intelligent mixed power diverter applied to commercial vehicle |
| CN110871841A (en) * | 2019-12-16 | 2020-03-10 | 北京理工大学 | Push-down electric power steering device for commercial vehicle |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113602349A (en) * | 2021-07-27 | 2021-11-05 | 十堰安联汽车零部件有限公司 | Mechanical structure of electric control hydraulic power-assisted steering gear |
| CN115285212A (en) * | 2022-07-04 | 2022-11-04 | 安徽德孚转向***股份有限公司 | R-EPS pure electric power steering gear for commercial vehicle |
| CN115285212B (en) * | 2022-07-04 | 2024-04-12 | 安徽德孚转向***股份有限公司 | R-EPS pure electric power steering gear for commercial vehicle |
| 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 |
|---|---|---|
| CN112572604A (en) | Pure electric power steering gear for heavy commercial vehicle | |
| CN110871841A (en) | Push-down electric power steering device for commercial vehicle | |
| CN107444380B (en) | A kind of integrated form line traffic control hydraulic brake system | |
| CN112249152B (en) | Electric power steering system of large commercial vehicle and control method thereof | |
| CN107757380A (en) | A kind of integrated electric energy assisted braking system | |
| CN111776064A (en) | Electric circulating ball steering gear assembly for medium truck commercial vehicle | |
| CN206938851U (en) | Commercial car electric booster steering device and control device | |
| CN207466382U (en) | A kind of integrated electric energy assisted braking system | |
| CN110667693A (en) | Automatic drive-by-wire steering system of automobile | |
| CN101590874B (en) | Electric power steering device | |
| CN216185449U (en) | A drive-by-wire a steering system for heavy commercial car | |
| CN110884564B (en) | Electric servo angle steering gear | |
| CN106740020A (en) | Electric motor car deceleration, differential integrated driving rear axle assy | |
| CN110733563A (en) | electric circulating ball steering gear | |
| CN216269501U (en) | Double-motor planetary roller screw type electric power steering gear for heavy-load commercial vehicle | |
| CN113815721A (en) | A drive-by-wire a steering system for heavy commercial car | |
| CN207191038U (en) | A kind of integrated form line traffic control hydraulic brake system | |
| CN213442759U (en) | Electric power steering system of large-scale commercial vehicle | |
| CN215922314U (en) | Electric power-assisted steering system of medium-large commercial vehicle | |
| CN113147887B (en) | Pure electric steering system with safety redundancy for heavy commercial vehicle | |
| CN213921204U (en) | Electric power steering device for wire-controlled chassis of large-scale commercial vehicle | |
| CN201071058Y (en) | Electric direction converter of vehicle | |
| CN2630076Y (en) | Automobile booster steering gear | |
| CN209909141U (en) | Automatic gear shifting actuating mechanism | |
| CN220374616U (en) | Planetary gear parallel connection type pure electric power steering gear |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |