CN110748512A - Heavy truck power-assisted steering oil can - Google Patents
Heavy truck power-assisted steering oil can Download PDFInfo
- Publication number
- CN110748512A CN110748512A CN201911174665.3A CN201911174665A CN110748512A CN 110748512 A CN110748512 A CN 110748512A CN 201911174665 A CN201911174665 A CN 201911174665A CN 110748512 A CN110748512 A CN 110748512A
- Authority
- CN
- China
- Prior art keywords
- oil
- shell
- filter element
- end cover
- oil inlet
- 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
- 238000007789 sealing Methods 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 14
- 238000001514 detection method Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 239000004744 fabric Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 238000001914 filtration Methods 0.000 abstract description 10
- 239000012535 impurity Substances 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 3
- 239000002245 particle Substances 0.000 abstract description 3
- 230000000717 retained effect Effects 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 92
- 239000012530 fluid Substances 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 229910001335 Galvanized steel Inorganic materials 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000008397 galvanized steel Substances 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000010622 cold drawing Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/26—Supply reservoir or sump assemblies
-
- 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
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/062—Details, component parts
-
- 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
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/065—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by specially adapted means for varying pressurised fluid supply based on need, e.g. on-demand, variable assist
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/615—Filtering means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Analytical Chemistry (AREA)
- Power Steering Mechanism (AREA)
Abstract
The invention provides a heavy truck power-assisted steering oilcan; the filter element comprises a shell, an oil inlet pipe, a central support and a filter element, wherein a cavity is formed in the shell, an oil outlet, an oil inlet and an oil return opening which are communicated with the cavity are distributed at the bottom of the shell, the oil inlet pipe is fixedly connected with the shell, one end of the oil inlet pipe extends out of the oil inlet of the shell, the filter element is positioned in the shell, the other end of the oil inlet pipe extends into the filter element, an end cover of the filter element is fixed with the oil inlet pipe, one end of the central support is fixed with the shell in a threaded fit mode, and the other end. The steering oil can is converged into a steering system of a vehicle, so that the installation by a user is convenient; the oil inlet pipe is located the central bottom of the shell, oil flows enter the filter element through the oil inlet pipe, oil after filtering flows out from the outer part of the filter element through the oil outlet, the filtering direction is from inside to outside (opposite to a traditional filter), and the original large impurity particles retained in the shell can be intercepted and blocked, so that the filtering precision of the heavy truck power steering oil can is improved.
Description
Technical Field
The invention relates to a heavy truck power-assisted steering oilcan.
Background
The steering system is used as an important safety part of a heavy truck, a series of operations such as lane changing, turning around and the like of a vehicle in the running process are assisted and completed by the steering system, and the power steering system of the heavy truck is generally in a hydraulic boosting type due to large load capacity. Mainly comprises a steering oil pump, an oil cylinder, a control valve, an oil can and a connecting pipeline.
In the power steering system, the oilcan is a gas station (oil storage) which ensures the implementation of the hydraulic power-assisted action, and simultaneously, the oil of the system is continuously filtered and cooled, but the existing oilcan has unreasonable structure and influences the filtering effect, and the shell is made of more plastic materials and has poor heat dissipation performance.
Disclosure of Invention
The invention aims to solve the technical problem of providing the heavy truck power-assisted steering oilcan which is high in capacity, high in filtering precision and convenient to install.
In order to solve the technical problem, the invention provides a heavy truck power-assisted steering oilcan;
the filter element comprises a shell, an oil inlet pipe, a central support and a filter element, wherein a cavity is formed in the shell, an oil outlet, an oil inlet and an oil return opening which are communicated with the cavity are distributed at the bottom of the shell, the oil inlet pipe is fixedly connected with the shell, one end of the oil inlet pipe extends out of the oil inlet of the shell, the filter element is positioned in the shell, the other end of the oil inlet pipe extends into the filter element, an end cover of the filter element is fixed with the oil inlet pipe, one end of the central support is fixed with the shell in a threaded fit mode, and the other end.
After the structure is adopted, the heavy truck power-assisted steering oil can is converged into a steering system of a vehicle, so that the heavy truck power-assisted steering oil can is convenient and fast to install by a user; the oil inlet pipe is located the central bottom of the shell, oil flows enter the filter element through the oil inlet pipe, oil after filtering flows out from the outer part of the filter element through the oil outlet, the filtering direction is from inside to outside (opposite to a traditional filter), and the original large impurity particles retained in the shell can be intercepted and blocked, so that the filtering precision of the heavy truck power steering oil can is improved.
The oil inlet, the oil outlet and the oil discharge port are all arranged at the bottom of the shell, so that space can be saved, and the storage capacity of oil can be expanded.
In addition, the diversity of the pipeline arrangement of the steering system brings certain difficulty to the fixation of the oil can, the central support of the heavy truck power-assisted steering oil can is not directly welded on the shell, the surrounding type bolt fixation is adopted, 360-degree rotation and axial movement along the outer wall of the shell can be realized, and the installation is more flexible.
The heavy truck power-assisted steering oil can further comprises a bypass assembly, the bypass assembly comprises a spring and a bypass valve plate, the bypass valve plate and the spring are sleeved on a center support located on the outer side of the filter element, one end of the spring abuts against the inner wall of the shell, the other end of the spring abuts against the bypass valve plate, a bypass hole is formed in the end cover of the filter element, the end portion of the center support extends into the filter element from the bypass hole, and the bypass valve plate is in sealing fit with the end cover of the filter element at the edge of.
After the structure is adopted, along with the deepening of the pollution degree of the filter element, when the pressure difference between the inside and the outside of the filter element is increased to a preset value, the bypass valve plate pressed by the spring is jacked open, oil flows out from the center of the filter element without being filtered, and the phenomenon that the oil is cut off due to untimely maintenance of the filter element, namely the phenomenon that the oil is cut off, which can cause the ineffective power steering, is avoided.
The bypass assembly of the heavy truck power-assisted steering oil can also comprises a sealing ring, wherein the sealing ring is fixed on the filter element end cover at the edge of a bypass hole, and a bypass valve plate is in sealing fit with the filter element end cover at the edge of the bypass hole through the sealing ring; after adopting such structure, increase the leakproofness of bypass subassembly, when preventing this heavy truck power assisted steering oilcan normal use, take place fluid and not filter from the oilcan oil-out outflow.
The heavy truck power-assisted steering oilcan further comprises an oil dipstick assembly, wherein the oil dipstick assembly comprises an oil dipstick, an upper end cover, a lower end cover, a spongy cushion, a rubber pad, an umbrella-shaped cover and a bolt; the shell is provided with a detection tube communicated with the cavity and the outside, the upper end cover is matched with the detection tube, the bolt penetrates through the upper end cover and the lower end cover to be fixed with the dipstick, the spongy cushion is arranged between the upper end cover and the lower end cover, the rubber cushion is arranged between the dipstick and the lower end cover, and the side wall of the dipstick is provided with a liquid level reticle.
After adopting such structure, the dipstick subassembly is used for reminding in time to supply fluid, perhaps does not refuel too much, and when the vehicle operation, the fluid of a steering system flows often, or is compressed, and the liquid level is in undulant state, and the dipstick still has the exhaust function concurrently, keeps system internal pressure and liquid level stable.
The oil outlet of the heavy truck power-assisted steering oil can shell is sleeved with an oil outlet connector, and the oil return port of the shell is sleeved with an oil return connector.
The oil outlet interface of the power-assisted steering oilcan of the heavy truck is provided with 30-mesh stainless steel wire cloth.
The heavy truck power-assisted steering oil can shell is made of SPCC materials; after adopting such structure, the casing adopts metal material SPCC, and its heat dispersion is more superior. The heat conductivity coefficient of the metal material is almost 200 times that of the plastic material, and the oil pot of the heavy truck is large in size and large in oil storage amount, so that the heat dissipation performance is improved more obviously, and the storage capacity, the temperature rise and the cleanliness of oil products of the steering system oil pot have important influences on the power assisting effect.
Drawings
Fig. 1 is a schematic structural view of an embodiment of the power-assisted steering oil can of the heavy truck.
Fig. 2 is an enlarged view of a portion a of fig. 1.
Fig. 3 is a schematic structural diagram of a dipstick assembly of the present embodiment of the truck power steering oiler.
Detailed Description
As shown in fig. 1 to 3
The heavy truck power-assisted steering oilcan comprises a shell 1, an oil inlet pipe 2, a central support 4, a filter element 3, a bypass assembly and an oil dipstick assembly 6.
Casing 1 chooses SPCC metal material for use, adopt cask form with steel sheet cold drawing shaping, the manufacturability is good, promote this heat dispersion of heavily blocking power assisted steering oilcan, casing 1 is formed by the upper shield body and lower casing equipment, constitute the cavity in the casing 1, 1 bottom distribution of casing have with the communicating oil-out of cavity, oil inlet and oil return opening, the oil inlet is in 1 bottom central point of casing and puts, be equipped with intercommunication cavity and outside detection tube 12 on the casing 1, the oil-out cover of casing 1 is equipped with oil outlet port 13, the oil return opening cover of casing 1 is equipped with oil return interface 11, oil outlet port 13 has set up 30 mesh stainless steel wire cloth, oil outlet port 13 and oil return interface 11 inner wall are equipped with the screw thread.
Advance oil pipe 2 and filter core 3 and be in casing 1, advance oil pipe 2 lower extreme lateral wall and casing 1 oil inlet edge fastening, advance oil pipe 2 lower extreme and stretch out from the oil inlet of casing 1, filter core 3 is in the middle part of casing 1 cavity, advance inside oil pipe 2 upper end stretches into filter core 3, advance between oil pipe 2 and the filter core 3 sealedly, filter core 3 downside end cover 31 with advance between the oil pipe 2 upper portion lateral wall fixed, open at 3 upside end cover 31 up end centers of filter core has by pass hole 32, advance oil pipe 2 lower extreme and be equipped with the internal thread.
The filter element 3 adopts a star-shaped structure, high-efficiency composite glass fiber is used as a material, the filtering direction is from inside to outside, the filtering efficiency is β 10 to be more than or equal to 2, β 25 to be more than or equal to 75, the filtered oil flows out from the outside of the filter element 3 through the oil outlet port 13, large impurity particles originally retained in the shell 1 can be intercepted and blocked, the end cover 31 of the filter element 3 adopts a galvanized steel plate, galvanized steel wire cloth is added inside and outside the filter element for increasing the stiffness of the filter element, and the upper end cover 63 and the lower end cover 63 respectively contain an NBR sealing ring.
The upper end of the central support 4 is provided with threads, the central support 4 penetrates through the shell 1, the upper end of the central support 4 is in threaded fit with the upper cover body of the shell 1, the upper end of the central support 4 is fixed with the shell 1, the lower end of the central support 4 extends into the filter element 3 from the bypass hole 32, a gap exists between the central support 4 and the wall of the bypass hole 32, and the lower end of the central support 4 extending into the filter element 3 is fixed with the upper end of the oil inlet pipe 2 extending into the filter element 3.
The central support 4 is not directly welded on the shell 1 and is fixed by bolts in an encircling mode, 360-degree rotation and axial movement along the outer wall of the shell 1 can be achieved, and the installation is more flexible.
The bypass assembly comprises a spring 51, a sealing ring 52 and a bypass valve plate 53, the bypass valve plate 53 and the spring 51 are sleeved on the central support 4 positioned on the outer side of the filter element 3, one end of the spring 51 is abutted against the upper cover body of the shell 1, the other end of the spring 51 is abutted against the bypass valve plate 53, the sealing ring 52 is fixed on the end cover 31 of the filter element 3 at the edge of the bypass hole 32, and the bypass valve plate 53 is in sealing fit with the end cover 31 of the filter element 3 at the edge of the bypass hole 32 through.
The upper end face of the end cover 31 of the filter element 3 is provided with the bypass valve, the pollution degree of the filter element 3 deepens along with the lengthening of the service time, when the pressure difference between the inside and the outside of the filter element 3 is increased to a preset value, the bypass valve plate 53 pressed by the spring 51 is pushed open, the oil flows out from the center of the filter element 3 without being filtered, and the bypass valve is used as a bypass to avoid the phenomenon that the oil is cut off because the filter element 3 is not maintained in time, namely the phenomenon that the oil is cut off to cause ineffective power steering.
The dipstick assembly 6 comprises a dipstick 61, an upper end cover 62, a lower end cover 63, a spongy cushion 64, a rubber cushion 65, an umbrella-shaped cover 66 and a bolt 67; the upper end cover 62 is matched with the detection tube 12, the bolt 67 penetrates through the upper end cover 62 and the lower end cover 63 to be fixed with the dipstick 61, the spongy cushion 64 is arranged between the upper end cover 62 and the lower end cover 63, the rubber cushion 65 is arranged between the dipstick 61 and the lower end cover 63, and the side wall of the dipstick 61 is provided with a liquid level reticle.
The dipstick 61 is provided with a liquid level reticle (FULL/ADD) for reminding of timely supplementing oil (ADD) or not adding too much oil (FULL), when the vehicle runs, the oil of the steering system flows or is compressed constantly, the liquid level is in a fluctuation state, and the dipstick 61 also has an exhaust function, so that the internal pressure of the system and the liquid level are stable.
When the filter element 3 is maintained subsequently, the oil return connector 11 can be opened, the upper cover body and the nut are unscrewed after oil in the shell 1 is emptied, the spring 51, the valve cover and the filter element 3 are taken down, and the pollution to the environment is greatly reduced.
The maintenance and the use of the heavy truck power-assisted steering oilcan are explained as follows:
1. the mounting bracket is fixed on the frame or the chassis.
2. Oil inlet pipe 2, oil return pipe and oil discharge pipe are respectively screwed, and attention is paid to: the O-shaped ring should be coated with lubricating oil first.
3. Screwing off the oil level gauge 61, adding the specified oil, installing the oil level gauge 61 again according to the specified oil amount, checking whether the liquid level is in an ADD-FULL interval, if not, continuing to ADD the oil to the specified interval, and if the liquid level is higher than a FULL scale line, loosening the oil discharge port to discharge the oil.
4. The engine is started and the liquid level is checked for correct position.
5. The machine is stopped and the liquid level is checked, and if the liquid level rises above the FULL score line, venting is required.
6. It is recommended to check the liquid level before each start-up.
7. The new oil pot is first installed to maintain the filter element 3 and replace the oil product by 5000 kilometers, and then to replace the hydraulic oil and the filter element 3 by 2 kilometers or per year (first-come first priority).
8. The tightness of the fixing bolt of the central support 4 should be checked every year or 2 kilometres, and the sealing ring at the position of the connecting oil pipe should be replaced.
The above description is only one embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the principle of the present invention, and these should also be considered as falling within the protection scope of the present invention.
Claims (7)
1. A heavy truck power-assisted steering oilcan is characterized in that:
the filter element comprises a shell, an oil inlet pipe, a central support and a filter element, wherein a cavity is formed in the shell, an oil outlet, an oil inlet and an oil return opening which are communicated with the cavity are distributed at the bottom of the shell, the oil inlet pipe is fixedly connected with the shell, one end of the oil inlet pipe extends out of the oil inlet of the shell, the filter element is positioned in the shell, the other end of the oil inlet pipe extends into the filter element, an end cover of the filter element is fixed with the oil inlet pipe, one end of the central support is fixed with the shell in a threaded fit mode, and the other end.
2. The heavy truck power steering oilcan of claim 1, wherein:
the filter element is characterized by further comprising a bypass assembly, the bypass assembly comprises a spring and a bypass valve plate, the bypass valve plate and the spring are sleeved on a center support positioned on the outer side of the filter element, one end of the spring abuts against the inner wall of the shell, the other end of the spring abuts against the bypass valve plate, a bypass hole is formed in the end cover of the filter element, the end part of the center support extends into the filter element from the bypass hole, and the bypass valve plate is in sealing fit with the end cover of the filter element.
3. The heavy truck power steering oilcan of claim 2, wherein:
the bypass assembly further comprises a sealing ring, the sealing ring is fixed on the filter element end cover at the edge of the bypass hole, and the bypass valve plate is in sealing fit with the filter element end cover at the edge of the bypass hole through the sealing ring.
4. The heavy truck power steering oilcan of claim 1, wherein:
the oil dipstick assembly comprises an oil dipstick, an upper end cover, a lower end cover, a spongy cushion, a rubber pad, an umbrella-shaped cover and a bolt; the shell is provided with a detection tube communicated with the cavity and the outside, the upper end cover is matched with the detection tube, the bolt penetrates through the upper end cover and the lower end cover to be fixed with the dipstick, the spongy cushion is arranged between the upper end cover and the lower end cover, the rubber cushion is arranged between the dipstick and the lower end cover, and the side wall of the dipstick is provided with a liquid level reticle.
5. The heavy truck power steering oilcan of claim 1, wherein:
the oil outlet of the shell is sleeved with an oil outlet connector, and the oil return port of the shell is sleeved with an oil return connector.
6. The heavy truck power steering oilcan of claim 5, wherein:
the oil outlet port is provided with 30-mesh stainless steel wire cloth.
7. The heavy truck power steering oilcan of claim 1, wherein:
the shell is made of SPCC materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911174665.3A CN110748512A (en) | 2019-11-26 | 2019-11-26 | Heavy truck power-assisted steering oil can |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911174665.3A CN110748512A (en) | 2019-11-26 | 2019-11-26 | Heavy truck power-assisted steering oil can |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110748512A true CN110748512A (en) | 2020-02-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911174665.3A Pending CN110748512A (en) | 2019-11-26 | 2019-11-26 | Heavy truck power-assisted steering oil can |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110748512A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113864090A (en) * | 2021-11-10 | 2021-12-31 | 浙江益车宝科技有限公司 | Multifunctional energy-saving emission-reducing filter element device |
| CN115367009A (en) * | 2022-08-23 | 2022-11-22 | 三一重机有限公司 | Lower frame, traveling device and working machine |
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2019
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113864090A (en) * | 2021-11-10 | 2021-12-31 | 浙江益车宝科技有限公司 | Multifunctional energy-saving emission-reducing filter element device |
| CN113864090B (en) * | 2021-11-10 | 2022-09-30 | 马赟 | Multifunctional energy-saving emission-reducing filter element device |
| CN115367009A (en) * | 2022-08-23 | 2022-11-22 | 三一重机有限公司 | Lower frame, traveling device and working machine |
| CN115367009B (en) * | 2022-08-23 | 2023-05-16 | 三一重机有限公司 | Lower frame, running gear and operation machinery |
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