CN216619301U - Novel stable variable-displacement oil pump - Google Patents
Novel stable variable-displacement oil pump Download PDFInfo
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- CN216619301U CN216619301U CN202220181877.5U CN202220181877U CN216619301U CN 216619301 U CN216619301 U CN 216619301U CN 202220181877 U CN202220181877 U CN 202220181877U CN 216619301 U CN216619301 U CN 216619301U
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Abstract
The utility model provides a novel stable variable displacement oil pump which comprises a pump body, a rotor, a swinging ring and a three-section pilot valve, wherein the swinging ring and the rotor are eccentrically arranged, the swinging ring and the pump body can be arranged in a swinging manner through a sliding pin, an emission reduction arm and an emission increasing arm are arranged on the outer side of the swinging ring, an emission reduction cavity is arranged at the emission reduction arm between the pump body and the swinging ring, the emission increasing cavity is arranged at the emission increasing arm between the pump body and the swinging ring, the pump body and the emission increasing arm are abutted against an elastic part, the emission reduction cavity is communicated with the emission increasing cavity through an automatic oil supplementing thin flow channel, and the distance from the sliding pin to the emission reduction arm is greater than the distance from the sliding pin to the emission increasing arm; the three-section type pilot valve is used for controlling the oil evacuation in the exhaust increasing cavity when the engine rotates at a low speed and a high speed. The utility model can control the oil pressure output of the lubricating oil to be in a stable state, reduce energy consumption, stabilize the load born by each component, and meet the requirement that the variable output of the lubricating oil can be realized when the engine rotates at low speed and high speed, so that the engine can run more stably and efficiently.
Description
Technical Field
The utility model belongs to the technical field of automobile engines, and particularly relates to a novel stable variable-displacement oil pump.
Background
The lubricating system of traditional automobile engine simply drives the oil pump rotor through the engine pivot and rotates to drive a plurality of blades of locating on the rotor and rotate, through the eccentric settings of oil pump inner chamber and pivot, make the blade rotate the in-process the not cavity of equidimension of volume that a plurality of blades enclose obtain compressing and expansion, finally realize negative pressure oil absorption and high pressure oil delivery. Therefore, in the oil pump, after the eccentric distance between the center of the inner cavity of the oil pump and the axis of the rotating shaft is fixed, the output quantity of the high-pressure oil provided by the oil pump is completely determined by the rotating speed of the engine, namely the oil pump is called a constant displacement pump. Constant displacement pumps tend to waste excess oil delivery when the vehicle is operating at high speeds.
With the continuous progress of automobile engine technology, the requirements on the stability and energy conservation of engine lubricating oil pressure are higher and higher, so that the application of the variable displacement oil pump is more and more common. However, the variable of the variable displacement oil pump is realized by that the swinging ring is deflected or slides inside to change the eccentricity, so that the variable displacement is realized, the swinging ring is subjected to resistance from the adjusting spring during movement to compress the spring, the resistance is increased along with the increase of the compression degree of the spring, the pressure of lubricating oil required by the variable displacement pump is higher in the process from the maximum displacement to the minimum displacement, the pressure of the lubricating oil output by the oil pump is increased along with the increase of the rotating speed, and the energy consumption and the load borne by each component inside the engine are higher and higher. The variable is realized in the existing common variable displacement oil pump mainly by the motion of the oil pressure drive swing ring to reduce the displacement, thereby reducing the energy consumption and the load of each component of the engine, but because of the existence of the adjusting spring, the motion distance of the swing ring is increased, the resistance to the swing ring is also increased, and the oil pressure is also increased continuously.
Therefore, a person skilled in the art arranges an increasing and discharging cavity in the oil pump to avoid the swing of the swing ring inside and overcome the defect that the oil pressure is continuously increased due to the increase of the resistance of the spring; however, the oil in the increasing and discharging cavity in the existing oil pump is controlled by a valve to enable the lubricating oil in the oil outlet of the pump or the engine to flow in, so that the balance cannot be automatically realized, and the manufacturing cost is increased; meanwhile, the conventional variable displacement oil pump only can change the displacement of the engine at a high rotating speed and cannot meet the requirement of the variable displacement of the engine at a low rotating speed.
SUMMERY OF THE UTILITY MODEL
In view of the defects of the prior art, the utility model discloses a novel stable variable displacement oil pump, which is used for controlling the oil pressure output of lubricating oil to be in a stable state, reducing the energy consumption, stabilizing the load born by each component, and meeting the requirement that the variable output of the lubricating oil can be realized when an engine rotates at a low speed and a high speed, so that the engine can run more stably and efficiently.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a novel smooth variable displacement oil pump, comprising:
the pump comprises a pump body and a rotor arranged in the pump body; the swing ring is eccentrically arranged with the rotor, the swing ring and the pump body can be arranged in a swinging mode through a sliding pin, an emission reduction arm and an emission increasing arm are arranged on the outer side of the swing ring, an emission reduction cavity is arranged at the emission reduction arm between the pump body and the swing ring, an emission increasing cavity is arranged at the emission increasing arm between the pump body and the swing ring, the pump body and the swing ring are abutted against an elastic part, the emission reduction cavity and the emission increasing cavity are communicated through an automatic oil supplementing thin flow passage, and the distance from the sliding pin to the emission reduction arm is larger than the distance from the sliding pin to the emission increasing arm; and the three-section type pilot valve is used for controlling the oil in the emission increasing cavity to be discharged when the engine rotates at a low speed and at a high speed.
As a further description of the above technical solution:
therefore, the pump body is provided with an engine feedback oil flow passage which is communicated with the emission reduction cavity and is communicated with the three-section pilot valve control end.
As a further description of the above technical solution:
the engine feedback oil channel is communicated with a high-pressure control end and a low-pressure control end of the three-section type pilot valve respectively, and the three-section type pilot valve is provided with an electromagnetic valve used for controlling the engine feedback oil channel to be communicated with the high-pressure control end or the low-pressure control end of the three-section type pilot valve.
As a further description of the above technical solution:
the three-section type pilot valve comprises a pilot valve plug, a pilot valve spring and a three-section type pilot valve body.
As a further description of the above technical solution:
the emission reduction cavity and the emission increasing cavity are positioned on two sides of the swinging ring by taking the sliding pin as the center.
As a further description of the above technical solution:
the emission reduction cavity is formed by the inner wall of the pump body, the outer wall of the swinging ring and the emission reduction arm.
As a further description of the above technical solution:
the increase and discharge cavity is formed by the inner wall of the pump body, the outer wall of the swinging ring and the increase and discharge arm.
As a further description of the above technical solution:
the variable displacement oil pump also comprises a pump cover matched with the pump body, and the automatic oil supplementing thin flow passage is arranged on the swinging ring, the pump body or the pump cover.
As a further description of the above technical solution:
the elastic piece is a spring, one end of the spring is abutted against the swinging ring, and the other end of the spring is abutted against the inner wall of the pump body.
As a further description of the above technical solution:
the emission reduction arm and the emission increasing arm are respectively in sealing connection with the pump body through sealing parts.
The utility model has the following beneficial effects:
(1) the swing ring maintaining balance condition of the variable displacement oil pump provided by the utility model is as follows: the torque formed by multiplying the pressure of the emission reduction cavity oil by the distance from the sliding pin to the emission reduction arm is equal to the torque formed by multiplying the pressure of the emission reduction cavity oil by the distance from the sliding pin to the emission reduction arm and adding the resistance of the spring by the distance from the sliding pin to the spring mounting position; namely, after the oil in the emission reduction cavity is discharged partially quickly, the oil in the emission reduction cavity is not supplemented to the emission reduction cavity in time, the oil pressure in the emission reduction cavity is reduced or even disappears, the torque formed by multiplying the pressure of the oil in the emission reduction cavity by the distance from the sliding pin to the emission reduction arm is larger than the torque formed by multiplying the pressure of the oil in the emission reduction cavity by the distance from the sliding pin to the emission reduction arm and the torque formed by multiplying the resistance of the spring by the distance from the sliding pin to the spring installation position, namely, the swinging ring is pushed to swing, the displacement of the oil pump is changed, the resistance of the spring is continuously increased in the swinging process of the swinging ring, but the oil pressure in the emission reduction cavity is continuously and gradually reduced, the torque formed by multiplying the pressure of the oil in the emission reduction cavity by the distance from the sliding pin to the emission reduction arm is always larger than or equal to the torque formed by multiplying the pressure of the oil in the emission reduction cavity by the distance from the sliding pin to the emission reduction arm and the torque formed by multiplying the resistance of the spring by the distance from the sliding pin to the spring installation position, therefore, the feedback oil pressure in the emission reduction cavity tends to be in a stable state and cannot be continuously increased, namely the oil pressure output by the oil pump is in a stable state, so that the energy consumption is reduced and the load born by each component is stabilized.
(2) The variable displacement oil pump provided by the utility model introduces the engine oil in the emission reduction cavity into the emission increasing cavity under the action of the automatic oil supplementing thin flow channel, and discharges the engine oil in the emission increasing cavity by opening the pilot valve after the engine oil pressure reaches a set value, so that the swinging ring swings under the combined action of increasing and decreasing the oil pressure difference of the emission increasing cavity and the adjusting spring to maintain the balance of the oil pressure.
(3) According to the utility model, the three-section type pilot valve can control the oil in the emission increasing cavity to be discharged when the engine is at a low rotating speed, namely the oil pressure in the emission reducing cavity is at a low pressure, so that the swinging of the swinging ring is realized, the discharge capacity of the engine oil pump is changed, and the three-section type pilot valve can control the oil in the emission increasing cavity to be discharged when the engine is at a high rotating speed, namely the oil pressure in the emission reducing cavity is at a high pressure, so that the swinging of the swinging ring is realized, and the discharge capacity of the engine oil pump is changed; therefore, the variable-displacement oil pump can realize the displacement change of the variable-displacement oil pump when the engine is at low pressure and high pressure, so that the engine can run more stably and efficiently.
Drawings
FIG. 1 is a schematic structural view of a novel smooth variable displacement oil pump provided by the present invention;
FIG. 2 is a schematic cross-sectional view of a three-segment pilot valve in a pump body;
FIG. 3 is a schematic view of the three-section type pilot valve communicating with the oil discharge passage and the engine feedback oil passage, respectively;
fig. 4 is a comparison graph of the oil pressure of the variable displacement oil pump provided by the present invention and the oil pressure of the conventional variable displacement oil pump.
Reference numbers in the figures: the device comprises a pump body 1, a rotor 2, a swinging ring 3, a three-section type pilot valve 4, an oil inlet 5, an oil outlet 6, a sliding pin 7, an emission reduction arm 8, an emission reduction arm 9, an emission reduction cavity 10, an emission reduction cavity 11, an emission reduction cavity 12, an elastic part 13, an automatic oil supplementing thin flow channel 14, an engine feedback oil flow channel 15, an oil discharge channel 15, a high-pressure control end 41, a low-pressure control end 42, a pilot valve plug 43, a pilot valve spring 44, a three-section type pilot valve body 45, an electromagnetic valve 16, a sealing part 17 and a spring 18.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-3, a novel stable variable displacement oil pump includes a pump body 1, a pump cover, a rotor 2, a swing ring 3, and a three-section type pilot valve 4.
The pump body 1 is equipped with oil inlet 5 and oil-out 6, and rotor 2 sets up in the pump body 1, and it is connected with engine crankshaft, and rotor 2 rotates the back, drives a plurality of blades of locating on rotor 2 and rotates, through the eccentric settings of swing ring 3 and rotor 2, makes the flexible different volume size of blade rotation in-process realize negative pressure oil absorption and high pressure oil delivery.
The swing ring 3 and the rotor 2 are eccentrically arranged, the swing ring 3 and the pump body 1 can be arranged in a swinging mode through a sliding pin 7, an emission reduction arm 8 and an emission increasing arm 9 are arranged on the outer side of the swing ring 3, an emission reduction cavity 10 is arranged at the emission reduction arm 8 between the pump body 1 and the swing ring 3, an emission increasing cavity 11 is arranged at the emission increasing arm 9 between the pump body 1 and the swing ring 3, the pump body 1 and the swing ring 3 are abutted against an elastic part 12, the emission reduction cavity 10 and the emission increasing cavity 11 are communicated through an automatic oil supplementing thin flow passage 13, and the distance from the sliding pin 7 to the emission reduction arm 8 is larger than the distance from the sliding pin 7 to the emission increasing arm 9; so as to realize the oil discharge in the emission increasing cavity 11, and after the swinging ring 3 swings, the oil in the emission reducing cavity 10 automatically and slowly flows into the emission increasing cavity 11, namely, the oil is automatically supplemented to the emission increasing cavity 11, and the balance of the swinging ring 3 is maintained.
The swinging ring 3 of the variable displacement oil pump provided by the utility model maintains the balance condition as follows: reducing the pressure N of the oil in the chamber 101Multiplied by the distance L of the sliding pin 7 from the abatement arm 81Resulting torque T1Equal to the pressure N of the oil in the booster and discharge cavity 112Multiplied by the distance L from the sliding pin 7 to the incrementing arm 92Resulting torque T2Plus the resistance N of the spring (elastic member 12)3Multiplied by the distance L of the slide pin 7 from the spring mounting location 183Resulting torque T3(i.e., N)1×L1＝T1＝(N2×L2+N3×L3) (ii) a When the oil in the emission reduction cavity 11 is discharged quickly, the oil in the emission reduction cavity 10 does not supplement the oil to the emission reduction cavity 11 in time, the pressure of the oil in the emission reduction cavity 11 is reduced or even disappears, and the pressure of the oil in the emission reduction cavity 10 is multiplied by the distance L from the sliding pin 7 to the emission reduction arm 81Resulting torque T1The pressure of oil in the booster cavity 10 is multiplied by the distance L from the sliding pin 7 to the booster arm 92Resulting torque T2Plus the resistance of the spring times the distance of the sliding pin 7 from the spring mounting location 18L3Resulting torque T3(N1×L1＝T1>N2×L2+N3×L3) That is, the swing ring 3 is pushed to swing, the displacement of the oil pump is changed, although the resistance of the spring is continuously increased in the swing process of the swing ring 3, the pressure of the oil in the emission reduction cavity 11 is gradually reduced and even disappears, the torque formed by multiplying the pressure of the oil in the emission reduction cavity 10 by the distance from the sliding pin 7 to the emission reduction arm 8 is always greater than or equal to the torque formed by multiplying the pressure of the oil in the emission reduction cavity by the distance from the sliding pin 7 to the emission reduction arm 9 and the torque formed by multiplying the resistance of the spring by the distance from the sliding pin 7 to the spring mounting position 18, so that the feedback oil pressure in the emission reduction cavity 10 tends to be in a stable state and does not continuously increase, that is, the oil pressure output by the oil pump presents a stable state (as shown in fig. 4), the energy consumption is reduced, and the load borne by each component is stabilized.
The three-section type pilot valve 4 is used for controlling the oil in the emission increasing cavity 11 to be discharged when the engine rotates at a low speed and a high speed, so that the variable output of the lubricating oil can be realized when the engine rotates at a low speed and a high speed, and the engine can run more stably and efficiently; the pump body 1 is provided with an engine feedback oil flow passage 14, the engine feedback oil flow passage 14 is communicated with the emission reduction cavity 10, and the engine feedback oil flow passage 14 is communicated with the control end of the three-section type pilot valve 4.
In this embodiment, the exhaust increasing cavity 11 is communicated with an oil discharge channel 15, the three-stage pilot valve 4 is disposed at the oil discharge channel 15, the engine feedback oil channel 14 is respectively communicated with the high pressure control end 41 and the low pressure control end 42 of the three-stage pilot valve 4, and the three-stage pilot valve 4 is configured with an electromagnetic valve 16 for controlling the communication between the engine feedback oil channel 14 and the high pressure control end 41 or the low pressure control end 42 of the three-stage pilot valve 4; specifically, when the engine rotates at a low speed, that is, when the lubricating oil fed back by the engine is in a low-pressure state, the electromagnetic valve 16 controls the engine feedback oil flow channel 14 to be communicated with the low-pressure control end 42 of the three-section type pilot valve 4, so that the low-pressure lubricating oil is opened by the three-section type pilot valve 4, the feedback low-pressure lubricating oil in the additional discharge cavity 11 is discharged, and the output of the variable of the oil pump of the swing control of the swing ring 3 is completed; when the engine rotates at a high speed, that is, when the lubricating oil fed back by the engine is in a high-pressure state, the electromagnetic valve 16 controls the engine feedback oil flow channel 14 to be communicated with the high-pressure control end 41 of the three-section type pilot valve 4, so that the high-pressure lubricating oil is opened by the three-section type pilot valve 4, the feedback high-pressure lubricating oil in the increasing and discharging cavity 11 is discharged, and the output of the swing control oil pump variable of the swing ring 3 is completed.
In some embodiments, the three-section pilot valve 4 includes a pilot valve plug 43, a pilot valve spring 44 and a three-section pilot valve body 45, the pilot valve plug 43 can be fixed on the pump body 1 by a thread, the three-section pilot valve body 45 is installed on the pilot valve plug 43 by the pilot valve spring 44, that is, the lubricating oil flows into the low-pressure control end 42 or the high-pressure control end 41 of the three-section pilot valve body 45 through the engine feedback oil channel 14 to form a pressure to push the three-section pilot valve body 45 to compress the pilot valve spring 44, so that the three-section pilot valve body 45 controls the oil discharge channel 15 to open, that is, the feedback lubricating oil in the additional discharge cavity 11 is discharged.
Preferably, the cross-sectional area of the high-pressure control end 41 of the three-stage pilot valve body 45 in contact with the lubricating oil is larger than the cross-sectional area of the low-pressure control end 42 in contact with the lubricating oil, so that the thrust generated by the low-pressure lubricating oil entering the low-pressure control end 42 and the thrust generated by the high-pressure lubricating oil entering the high-pressure control end 41 and overcoming the pilot valve spring 44 are the same, that is, both the fed-back low-pressure lubricating oil and high-pressure lubricating oil can open the three-stage pilot valve body 45, and the lubricating oil in the increase-discharge cavity 11 can be discharged.
According to the utility model, the three-section type pilot valve 4 can control the oil in the emission increasing cavity 11 to be discharged when the engine is at a low rotating speed, namely the oil pressure in the emission reducing cavity 10 is at a low pressure, so that the swinging of the swinging ring 3 is realized, the discharge capacity of the engine oil pump is changed, and the three-section type pilot valve 4 can control the oil in the emission increasing cavity 11 to be discharged when the engine is at a high rotating speed, namely the oil pressure in the emission reducing cavity 10 is at a high pressure, so that the swinging of the swinging ring 3 is realized, and the discharge capacity of the engine oil pump is changed; therefore, the variable-displacement oil pump can realize the displacement change of the variable-displacement oil pump when the engine is at low pressure and high pressure, so that the engine can run more stably and efficiently.
In the present embodiment, the emission reducing chamber 10 and the emission increasing chamber 11 are located on two sides of the swing ring 3 near the center of the sliding pin 7, and the positions of the emission reducing chamber 10 and the emission increasing chamber 11 do not limit the protection scope of the present invention, and can be selected by those skilled in the art according to specific situations.
In the embodiment, the emission reduction arm 8 and the emission increasing arm 9 are respectively connected with the pump body 1 in a sealing manner through a sealing member 17; the emission reduction cavity 10 is formed by the inner wall of the pump body 1, the outer wall of the swinging ring 3 and the emission reduction arm 8; the increased discharge cavity 11 is formed by the inner wall of the pump body 1, the outer wall of the swinging ring 3 and the increased discharge arm 9.
In this embodiment, the automatic oil supply fine flow passage 13 is provided on the swing ring 3, and the automatic oil supply fine flow passage 13 may be provided on the pump body 1 or the pump cover as long as the emission reduction chamber 10 and the emission increase chamber 11 can be communicated with each other, and the specific position of the automatic oil supply fine flow passage 13 is not limited in the present invention. In addition, the automatic oil supply fine flow passage 13 is used for continuously supplying oil after oil drainage of the additional discharge cavity 11, so that the flow section of the automatic oil supply fine flow passage 13 is small, and the oil supply mode is slow oil supply.
In the present embodiment, the elastic member 12 comprises a spring, a steel sheet, a perforated bellows, etc., and is not intended to be exhaustive of the elastic member 12. Preferably, the elastic member 12 is a spring, one end of which abuts against the swing ring 3, and further, one end of which abuts against the ejection arm 9 of the swing ring 3, and the other end of which abuts against the inner wall of the pump body 1.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments, or make equivalent substitutions and improvements to part of the technical features of the foregoing 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 (10)
1. A novel smooth variable displacement oil pump is characterized by comprising:
the pump comprises a pump body and a rotor arranged in the pump body;
the swing ring is eccentrically arranged with the rotor, the swing ring and the pump body can be arranged in a swinging mode through a sliding pin, an emission reduction arm and an emission increasing arm are arranged on the outer side of the swing ring, an emission reduction cavity is arranged at the emission reduction arm between the pump body and the swing ring, an emission increasing cavity is arranged at the emission increasing arm between the pump body and the swing ring, the pump body and the swing ring are abutted against an elastic part, the emission reduction cavity and the emission increasing cavity are communicated through an automatic oil supplementing thin flow passage, and the distance from the sliding pin to the emission reduction arm is larger than the distance from the sliding pin to the emission increasing arm;
and the three-section type pilot valve is used for controlling the oil in the emission increasing cavity to be exhausted when the engine rotates at a low speed and at a high speed.
2. The novel smooth variable displacement oil pump of claim 1, wherein the pump body is provided with an engine feedback oil flow passage, the engine feedback oil flow passage is communicated with the emission reduction cavity, and the engine feedback oil flow passage is communicated with a three-section type pilot valve control end.
3. The novel smooth variable-displacement oil pump according to claim 2, wherein the emission increasing cavity is communicated with an oil discharge channel, the three-section type pilot valve is arranged at the oil discharge channel, the engine feedback oil flow channel is respectively communicated with the high-pressure control end and the low-pressure control end of the three-section type pilot valve, and the three-section type pilot valve is provided with a solenoid valve for controlling the engine feedback oil flow channel to be communicated with the high-pressure control end or the low-pressure control end of the three-section type pilot valve.
4. The novel smooth variable displacement oil pump of claim 3, wherein the three-segment pilot valve comprises a pilot valve plug, a pilot valve spring and a three-segment pilot valve body.
5. The novel smooth variable displacement oil pump of claim 1, wherein the emission abatement chamber and the emission boost chamber are located on either side of a swing ring centered about a sliding pin.
6. The novel smooth variable displacement oil pump of claim 1, wherein the emission reduction cavity is formed by a pump body inner wall, a swing ring outer wall and an emission reduction arm.
7. The novel smooth variable displacement oil pump according to claim 1, wherein the displacement increasing cavity is formed by a pump body inner wall, a swinging ring outer wall and a displacement increasing arm.
8. The novel smooth variable displacement oil pump of claim 1, further comprising a pump cover engaged with the pump body, wherein the automatic oil replenishment fine flow passage is provided on the swing ring, the pump body or the pump cover.
9. The novel smooth variable displacement oil pump according to claim 1, wherein the elastic member is a spring, one end of the spring abuts against the swing ring, and the other end of the spring abuts against the inner wall of the pump body.
10. The novel smooth variable-displacement oil pump according to claim 1, wherein the emission reduction arm and the emission increasing arm are respectively in sealing connection with the pump body through sealing pieces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220181877.5U CN216619301U (en) | 2022-01-24 | 2022-01-24 | Novel stable variable-displacement oil pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220181877.5U CN216619301U (en) | 2022-01-24 | 2022-01-24 | Novel stable variable-displacement oil pump |
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| Publication Number | Publication Date |
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| CN216619301U true CN216619301U (en) | 2022-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220181877.5U Active CN216619301U (en) | 2022-01-24 | 2022-01-24 | Novel stable variable-displacement oil pump |
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| Country | Link |
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| CN (1) | CN216619301U (en) |
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2022
- 2022-01-24 CN CN202220181877.5U patent/CN216619301U/en active Active
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