CN218367972U - Double-front-axle automobile energy-saving steering system and double-front-axle commercial vehicle - Google Patents
Double-front-axle automobile energy-saving steering system and double-front-axle commercial vehicle Download PDFInfo
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- CN218367972U CN218367972U CN202222344107.0U CN202222344107U CN218367972U CN 218367972 U CN218367972 U CN 218367972U CN 202222344107 U CN202222344107 U CN 202222344107U CN 218367972 U CN218367972 U CN 218367972U
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Abstract
The application discloses a double-front-axle automobile energy-saving steering system and a double-front-axle commercial vehicle, wherein a steering gear rocker arm is hinged with a power steering gear, one end of a transition pull rod is hinged with the steering gear rocker arm, and the other end of the transition pull rod is hinged with the transition rocker arm; an oil inlet of a hydraulic steering pump is connected with an oil outlet of an oil storage tank, an oil outlet of the hydraulic steering pump is connected with an input port of an energy accumulator, an output port of the energy accumulator is connected with an input end of a power steering gear, an output end of the power steering gear is connected with an oil return port of the oil storage tank, a motor is used for driving the hydraulic steering pump to operate, a first pressure detection device is arranged on a fluid path from the hydraulic steering pump to the energy accumulator, a second pressure detection device is arranged on a fluid path from the energy accumulator to the power steering gear, and the motor, the first pressure detection device and the second pressure detection device are all connected with a control unit. The double-front-axle automobile energy-saving steering system enables the automobile to save energy and reduce emission, and prolongs the service life of parts of the steering system.
Description
Technical Field
The application relates to the technical field of automobile steering systems, in particular to an energy-saving steering system of a double-front-axle automobile and a double-front-axle commercial vehicle.
Background
The power-assisted steering technology is a key component for ensuring the safe running of an automobile, can reduce the driving control force and improve the driving performance. The traditional hydraulic power-assisted steering system has fixed power-assisted characteristics, namely if the automobile can provide enough power assistance during parking, the power assistance is overlarge at a high speed and road feel is lost. And an oil pump in the system needs to be driven by an engine, and the power steering system needs to work no matter whether the vehicle is steered or not when the vehicle runs, so that energy waste is caused.
Taking a commercial new energy vehicle as an example, an electric steering pump is generally adopted to provide energy for a steering system, and in the use process of the vehicle, after high pressure is generated on the whole vehicle, the electric steering pump is always in a working state no matter whether steering action occurs or not. The steering system of the vehicle does not need energy under the working condition of straight running, and the energy of the system can only be dissipated in the form of heat because the electric steering pump also works at the moment. Under the different load steering operating mode of vehicle, the energy loss of the unable discernment of current system process of turning to, the electric steering pump can only provide the energy with rated rotational speed, can cause energy loss equally, and the loss of energy can give off the heat through steering system's fluid, and along with energy loss's accumulation, the temperature of system fluid can constantly rise to the life of steering system spare part produces the influence.
SUMMERY OF THE UTILITY MODEL
The application provides a double-front-axle automobile energy-saving steering system and a double-front-axle commercial vehicle, which aim to solve at least one technical problem in the technical problems.
The technical scheme adopted by the application is as follows:
a double-front-axle automobile energy-saving steering system comprises an oil storage tank, a hydraulic steering pump, a motor, an energy accumulator, a power steering gear, a steering gear rocker arm, a transition pull rod, a transition rocker arm and a control unit, wherein the steering gear rocker arm is hinged with the power steering gear, one end of the transition pull rod is hinged with the steering gear rocker arm, and the other end of the transition pull rod is hinged with the transition rocker arm; the hydraulic steering pump oil inlet with the oil-out of batch oil tank is connected, the hydraulic steering pump oil outlet with the input port connection of energy storage ware, the delivery outlet of energy storage ware with the input of power steering ware is connected, the output of power steering ware with the oil return opening of batch oil tank is connected, the motor is used for the drive the hydraulic steering pump operation, the hydraulic steering pump extremely be equipped with first pressure detection device on the fluid route of energy storage ware, the energy storage ware extremely be equipped with second pressure detection device on the fluid route of power steering ware, the motor first pressure detection device second pressure detection device all with the control unit is connected.
The energy-saving steering system of the double-front-axle automobile further has the following additional technical characteristics:
the power steering gear comprises a power cylinder and a steering control valve, wherein the steering control valve comprises a valve sleeve and a valve core arranged in the valve sleeve, the valve sleeve is provided with a high-pressure oil inlet oil duct and a left power oil duct and a right power oil duct which are respectively positioned at two sides of the high-pressure oil inlet oil duct, the left power oil duct is communicated with a left oil cavity of the power cylinder, the right power oil duct is communicated with a right oil cavity of the power cylinder, the valve core is provided with an oil storage groove and an oil return duct, the oil return duct is connected with the oil return port, and the valve core can rotate relative to the valve sleeve to have a pause position and a working position; at the stop position, the valve core cuts off the communication between the high-pressure oil inlet oil duct and the left power-assisted oil duct and cuts off the communication between the high-pressure oil inlet oil duct and the right power-assisted oil duct, and the high-pressure oil inlet oil duct is communicated with the oil storage tank so as to store oil in the oil storage tank; in the working position, the high-pressure oil inlet oil duct is communicated with one of the left power-assisted oil duct and the right power-assisted oil duct through an oil storage groove, and the oil return oil duct is communicated with the other of the left power-assisted oil duct and the right power-assisted oil duct.
And a one-way conduction device is arranged on a water flow path between the hydraulic steering pump and the energy accumulator, and the one-way conduction device enables the oil outlet of the hydraulic steering pump to be in one-way conduction with the input port of the energy accumulator.
The first pressure detection device and the second pressure detection device are both set to be pressure sensors.
The motor drives the hydraulic steering pump to operate through belt transmission or gear transmission.
The double-front-axle automobile energy-saving steering system further comprises a temperature sensor for measuring the temperature of oil in the oil storage tank, and the temperature sensor is connected with the control unit.
The power steering gear is a recirculating ball type steering gear.
The utility model provides a two front axle commercial cars, including a steering system, a steering system sets up as above two front axle car energy-saving steering system.
Due to the adoption of the technical scheme, the technical effects obtained by the application are as follows:
according to the technical scheme, the motor is adopted to drive the hydraulic steering pump, meanwhile, the control unit is combined, the first pressure detection device, the second pressure detection device and the energy accumulator are used for achieving the opening and closing controllability of the hydraulic steering pump, namely, the intermittent operation of the motor and the hydraulic steering pump is achieved, so that when a vehicle is in a non-steering operation condition, energy is stored in the energy accumulator, the motor and the hydraulic steering pump can stop working until the steering operation condition occurs, the problem of energy loss of the vehicle under the straight-going operation condition and the different load steering operation condition is solved, the purposes of energy conservation and emission reduction are achieved, meanwhile, the temperature rise of a steering system can be reduced, and the service lives of parts of the steering system are prolonged. And, because the pressurize effect of accumulator, the hydraulic steering pump only need supply a small amount of ability can satisfy the helping hand demand when turning to the operating mode, consequently, only need little hydraulic steering pump can realize the same helping hand effect, has practiced thrift the energy consumption better, promotes system's fuel economy by a wide margin.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a schematic structural diagram of an energy-saving steering system for a double-front-axle vehicle according to the present application;
FIG. 2 is a first schematic structural view of the steering control valve provided herein, illustrating the spool in a rest position;
fig. 3 is a structural schematic diagram ii of the steering control valve provided in the present application, which shows a state where the valve element is located at the working position.
Reference numerals:
the hydraulic steering system comprises a 1 oil storage tank, a 2 hydraulic steering pump, a 3 electric motor, a 4 energy accumulator, a 5 power steering gear, a 6 steering gear rocker arm, a 7 transition pull rod, an 8 transition rocker arm, a 9 control unit, a 10 first pressure detection device, a 11 second pressure detection device, a 12 steering control valve, a 121 valve sleeve, a 122 valve core, a 123 high-pressure oil inlet channel, a 124 left power-assisted oil channel, a 125 right power-assisted oil channel, a 126 oil storage tank, a 127 oil return channel and a 13 one-way conduction device.
Detailed Description
In order to more clearly explain the overall concept of the present application, the following detailed description is given by way of example in conjunction with the accompanying drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited by the specific embodiments disclosed below.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and encompass, for example, both fixed and removable connections or integral parts thereof; the connection can be mechanical connection, electrical connection or communication; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the embodiment of the application, an energy-saving steering system for a double-front-axle automobile and a double-front-axle commercial vehicle are provided, and for convenience of explanation and understanding, the following contents provided by the application are all explained on the basis of the structure of a product shown in the drawing. Of course, it is understood by those skilled in the art that the above-described structure is only used as a specific example and illustrative illustration, and does not constitute a specific limitation to the technical solution provided by the present application.
As shown in fig. 1, the energy-saving steering system of the double front axle automobile comprises an oil storage tank 1, a hydraulic steering pump 2, a motor 3, an energy storage 4, a power steering gear 5, a steering gear rocker arm 6, a transition pull rod 7, a transition rocker arm 8 and a control unit 9, wherein the steering gear rocker arm 6 is hinged with the power steering gear 5, one end of the transition pull rod 7 is hinged with the steering gear rocker arm 6, and the other end of the transition pull rod 7 is hinged with the transition rocker arm 8; the fluid entry of hydraulic pressure steering pump 2 with the oil-out of batch oil tank 1 is connected, the fluid export of hydraulic pressure steering pump 2 with the input port of energy storage ware 4 is connected, the delivery outlet of energy storage ware 4 with the input of power steering ware 5 is connected, the output of power steering ware 5 with the oil return opening of batch oil tank 1 is connected, motor 3 is used for the drive hydraulic pressure steering pump 2 moves, hydraulic pressure steering pump 2 extremely be equipped with first pressure measurement on the fluid path of energy storage ware 4 10, energy storage ware 4 extremely be equipped with second pressure measurement 11 on the fluid path of power steering ware 5, motor 3 first pressure measurement 10 second pressure measurement 11 all with the control unit 9 is connected.
Among the technical scheme of this application, steering gear rocking arm 6 is articulated with power steering 5, the one end and the steering gear rocking arm 6 of transition pull rod 7 are articulated, the other end and the transition rocking arm 8 of transition pull rod 7 are articulated, wherein, the first front axle of the first front axle drag link of steering gear rocking arm 6 accessible and two front axle cars is connected, the second front axle of the second front axle drag link of transition rocking arm 8 accessible and two front axle cars is connected, thereby make two front axle cars in the driving process, this energy-conserving steering system of accessible provides the power assisted steering for first front axle and second front axle.
Specifically, the first pressure detection device 10 may be configured to detect a pressure of oil in the oil line between an oil outlet of the hydraulic steering pump 2 and an input of the accumulator 4, the second pressure detection device 11 may be configured to detect a pressure of oil in the oil line between an output of the accumulator 4 and an input of the power steering gear 5, the first pressure detection device 10 and the second pressure detection device 11 transmit detected pressure data to the control unit 9, and the control unit 9 controls the opening, the stopping, and the change of the operating power of the electric motor 3 according to the information of the pressure of oil.
For example, the maximum pressure of the energy storage device 4 is set to 15MPa, the opening pressure of the hydraulic steering pump 2 is calibrated to 10MPa, and when the second pressure detection device 11 detects that the pressure of oil in the oil pipeline from the energy storage device 4 to the power steering device 5 is lower than 10MPa, the control unit 9 controls the motor 3 to be opened, so that the hydraulic steering pump 2 operates, and oil in the oil storage tank 1 is pumped into the energy storage device 4 for energy storage. When the second pressure detection device 11 detects that the pressure of oil in the oil pipeline from the energy accumulator 4 to the power steering gear 5 reaches the maximum pressure of 15MPa, the control unit 9 controls the motor 3 to stop, so that the hydraulic steering pump 2 stops running, the intermittent work of the hydraulic steering pump 2 is realized, and the purposes of energy conservation and emission reduction are finally achieved.
Therefore, those skilled in the art can understand that in the technical scheme of the application, the motor 3 is adopted to drive the hydraulic steering pump 2, and the controllability of opening and closing the hydraulic steering pump 2 is realized by combining the control unit 9, the first pressure detection device 10, the second pressure detection device 11 and the energy storage device 4, that is, the intermittent operation of the motor 3 and the hydraulic steering pump 2 is realized, so that when the vehicle is in a non-steering operation condition, energy is stored in the energy storage device 4, the motor 3 and the hydraulic steering pump 2 can stop working until the steering operation condition occurs, the problem of energy loss of the vehicle under a straight-driving condition and a steering operation condition with different loads is solved, the purposes of energy conservation and emission reduction are achieved, meanwhile, the temperature rise of the steering system can be reduced, and the service lives of parts of the steering system are prolonged. And, because the pressurize effect of accumulator 4, hydraulic steering pump 2 only needs to supply a small amount of ability can satisfy the helping hand demand when turning to the operating mode, consequently, only needs little hydraulic steering pump can realize the same helping hand effect, has practiced thrift the energy consumption better, promotes the fuel economy of system by a wide margin.
It should be noted that, in the present application, a driving manner of the electric motor 3 to drive the hydraulic steering pump 2 is not particularly limited, and preferably, the electric motor 3 may drive the hydraulic steering pump 2 to operate through a belt transmission or a gear transmission.
In addition, the structure of the power steering gear 5 is not particularly limited, and preferably, the power steering gear 5 can adopt a recirculating ball type steering gear, so that the structure is simple, the cost is saved, the strength is high, and the service life is long.
As a preferred embodiment of this application, as shown in FIG. 2, power steering 5 includes helping hand cylinder and steering control valve 12, steering control valve 12 includes valve barrel 121 and locates valve core 122 in the valve barrel 121, valve barrel 121 is equipped with high-pressure oil inlet oil duct 123 and is located respectively the left helping hand oil duct 124 and the right helping hand oil duct 125 of high-pressure oil inlet oil duct 123 both sides, left helping hand oil duct 124 with the left oil pocket intercommunication of helping hand cylinder, right helping hand oil duct 125 with the right oil pocket intercommunication of helping hand cylinder, valve core 122 is equipped with oil storage tank 126 and oil return duct 127, oil return duct 127 with the oil return opening is connected, valve core 122 can be relative valve barrel 121 rotates in order to have outage position and operating position. Although not shown, the cylinder may be a conventional cylinder of a conventional steering system.
As shown in fig. 2, in the stop position, the valve element 122 cuts off the communication between the high-pressure oil inlet passage 123 and the left power oil passage 124 and cuts off the communication between the high-pressure oil inlet passage 123 and the right power oil passage 125, and the high-pressure oil inlet passage 123 is communicated with the oil storage tank 126 to store oil in the oil storage tank 126. That is, when the vehicle is running without steering, the valve core 122 is in a stop position, at this time, no relative motion occurs between the valve core 122 and the valve sleeve 121, under the blocking action of the valve core 122, the high-pressure oil inlet duct 123, the left power-assisted oil duct 124 and the right power-assisted oil duct 125 are all in a blocking state, oil is stored in the oil storage tank 126 of the valve core 122, the oil in the oil storage tank 126 does not form an oil circuit with the power cylinder, there is no pressure difference between two sides of the piston in the power cylinder, at this time, the motor 3 and the hydraulic steering pump 2 are both in a non-working state, and the oil pressure in the energy storage device 4 is kept constant.
In the working position, the high-pressure oil inlet passage 123 is communicated with one of the left oil passage 124 and the right oil passage 125 through an oil storage tank 126, and the oil return passage 127 is communicated with the other one of the left oil passage 124 and the right oil passage 125. That is, when the vehicle is turning, the spool 122 of the steering control valve 12 is driven by the input shaft of the steering wheel to rotate, and the spool 122 and the valve sleeve 121 move relatively. For example, as shown in fig. 3, when the vehicle turns right, the valve element 122 rotates along the direction from the high-pressure oil inlet passage 123 to the right power-assisted passage 125, so that the high-pressure oil inlet passage 123 is communicated with the right power-assisted passage 125 through the oil storage tank 126, high-pressure oil can flow to the right oil chamber of the power-assisted cylinder, the piston in the power-assisted cylinder moves to the left under the pressure in the right oil chamber, the oil in the left oil chamber flows back to the oil storage tank 1 through the oil return passage 127 of the valve element 122, and the piston in the power-assisted cylinder drives the transmission mechanism in the power steering gear 5 to achieve the right power-assisted steering effect. Of course, when the vehicle turns left, high-pressure oil enters the left oil cavity of the power cylinder through the left power oil duct 124, the oil in the right oil cavity of the power cylinder flows back to the oil storage tank 1 through the oil return duct 127, and the power piston drives the transmission mechanism in the power steering gear 5 to achieve the left steering power-assisted effect. In the process of vehicle steering, the pressure in the energy storage device 4 is reduced along with the reduction of the oil gas in the energy storage device 4, when the pressure in the energy storage device 4 is reduced to be lower than a preset threshold value, the motor 3 is started, the hydraulic steering pump 2 starts to work, the energy of the energy storage device 4 is continuously supplemented, and the motor 3 and the hydraulic steering pump 2 stop working until the pressure in the energy storage device 4 reaches the threshold value.
As a preferred embodiment of the present application, as shown in fig. 1, a one-way conduction device 13 is disposed on a water flow path between the hydraulic steering pump 2 and the energy storage device 4, and the one-way conduction device 13 makes an oil outlet of the hydraulic steering pump 2 in one-way conduction with an input port of the energy storage device 4. Preferably, the one-way conduction device 13 can be a one-way valve. It will be understood by those skilled in the art that the one-way conduction device 13 can prevent the oil in the accumulator 4 from flowing back toward the hydraulic steering pump 2 to affect the normal operation of the hydraulic steering pump 2.
As a preferred embodiment of the present application, the first pressure detection device 10 and the second pressure detection device 11 may be both pressure sensors, so that the structure is simple and the cost is saved. Of course, the first pressure detection device 10 and the second pressure detection device 11 may also be of other suitable structures as long as the requirement of being able to detect the oil pressure in the oil pipeline is met.
As a preferred embodiment of the present application, the energy-saving steering system for a double front axle vehicle may further include a temperature sensor for measuring the temperature of the oil in the oil storage tank 1, and the temperature sensor is connected to the control unit 9. The oil temperature in the oil storage tank 1 can be acquired in real time through the temperature sensor, the oil temperature is monitored, and the energy-saving steering system is overhauled when abnormal data occur to the oil temperature.
The utility model provides a two front axle commercial cars, including a steering system, a steering system sets up as above two front axle car energy-saving steering system.
It should be noted that, because the dual-front-axle commercial vehicle provided by the present application includes the dual-front-axle vehicle energy-saving steering system in any of the above embodiments, the dual-front-axle vehicle energy-saving steering system has beneficial effects that the dual-front-axle commercial vehicle provided by the present application includes, and details are not described herein. Moreover, the double-front-axle automobile energy-saving steering system is more suitable for commercial new energy automobile types, such as pure electric buses and the like, an engine device is omitted, and the hydraulic steering pump can be driven by the motor to operate.
Where not mentioned in this application, can be accomplished using or referencing existing technology.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement or the like made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.
Claims (8)
1. The energy-saving steering system of the double-front-axle automobile is characterized by comprising an oil storage tank, a hydraulic steering pump, a motor, an energy accumulator, a power steering gear, a steering gear rocker arm, a transition pull rod, a transition rocker arm and a control unit, wherein the steering gear rocker arm is hinged with the power steering gear, one end of the transition pull rod is hinged with the steering gear rocker arm, and the other end of the transition pull rod is hinged with the transition rocker arm;
the utility model discloses a hydraulic steering pump, including hydraulic steering pump, accumulator, motor, first pressure detection device, second pressure detection device, hydraulic steering pump's fluid entry with the oil-out of batch oil tank is connected, hydraulic steering pump's fluid export with the input port connection of accumulator, the delivery outlet of accumulator with the input of power steering is connected, power steering's output with the oil return opening of batch oil tank is connected, the motor is used for the drive hydraulic steering pump operation, hydraulic steering pump extremely be equipped with first pressure detection device on the fluid path of accumulator, the accumulator extremely be equipped with second pressure detection device on power steering's the fluid path, the motor first pressure detection device second pressure detection device all with the control unit is connected.
2. The energy-saving steering system of the automobile with double front axles as claimed in claim 1,
the power steering gear comprises a power cylinder and a steering control valve, wherein the steering control valve comprises a valve sleeve and a valve core arranged in the valve sleeve, the valve sleeve is provided with a high-pressure oil inlet oil duct and a left power oil duct and a right power oil duct which are respectively positioned at two sides of the high-pressure oil inlet oil duct, the left power oil duct is communicated with a left oil cavity of the power cylinder, the right power oil duct is communicated with a right oil cavity of the power cylinder, the valve core is provided with an oil storage groove and an oil return duct, the oil return duct is connected with an oil return opening, and the valve core can rotate relative to the valve sleeve to have a rest position and a working position;
at the stop position, the valve core cuts off the communication between the high-pressure oil inlet oil duct and the left power-assisted oil duct and cuts off the communication between the high-pressure oil inlet oil duct and the right power-assisted oil duct, and the high-pressure oil inlet oil duct is communicated with the oil storage tank to store oil in the oil storage tank; in the working position, the high-pressure oil inlet oil duct is communicated with one of the left power-assisted oil duct and the right power-assisted oil duct through an oil storage groove, and the oil return oil duct is communicated with the other of the left power-assisted oil duct and the right power-assisted oil duct.
3. The energy-saving steering system for the double-front-axle automobile according to claim 1,
and a one-way conduction device is arranged on a water flow path between the hydraulic steering pump and the energy accumulator, and the one-way conduction device enables the oil outlet of the hydraulic steering pump to be in one-way conduction with the input port of the energy accumulator.
4. The energy-saving steering system of the automobile with double front axles as claimed in claim 1,
the first pressure detection device and the second pressure detection device are both set to be pressure sensors.
5. The energy-saving steering system of the automobile with double front axles as claimed in claim 1,
the motor drives the hydraulic steering pump to operate through belt transmission or gear transmission.
6. The energy-saving steering system of the automobile with double front axles as claimed in claim 1,
the double-front-axle automobile energy-saving steering system further comprises a temperature sensor for measuring the temperature of oil in the oil storage tank, and the temperature sensor is connected with the control unit.
7. The energy-saving steering system for the double-front-axle automobile according to any one of claims 1 to 6,
the power steering gear is a recirculating ball type steering gear.
8. A double-front-axle commercial vehicle comprising a steering system, wherein the steering system is the double-front-axle vehicle energy-saving steering system as claimed in any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222344107.0U CN218367972U (en) | 2022-09-02 | 2022-09-02 | Double-front-axle automobile energy-saving steering system and double-front-axle commercial vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222344107.0U CN218367972U (en) | 2022-09-02 | 2022-09-02 | Double-front-axle automobile energy-saving steering system and double-front-axle commercial vehicle |
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| CN218367972U true CN218367972U (en) | 2023-01-24 |
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| CN202222344107.0U Active CN218367972U (en) | 2022-09-02 | 2022-09-02 | Double-front-axle automobile energy-saving steering system and double-front-axle commercial vehicle |
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| CN (1) | CN218367972U (en) |
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- 2022-09-02 CN CN202222344107.0U patent/CN218367972U/en active Active
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