CN212744106U - Oil pump pressure limiting valve capable of reducing pressure fluctuation - Google Patents
Oil pump pressure limiting valve capable of reducing pressure fluctuation Download PDFInfo
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- CN212744106U CN212744106U CN202021650876.8U CN202021650876U CN212744106U CN 212744106 U CN212744106 U CN 212744106U CN 202021650876 U CN202021650876 U CN 202021650876U CN 212744106 U CN212744106 U CN 212744106U
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- limiting valve
- plunger
- pressure limiting
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- 238000007906 compression Methods 0.000 claims abstract description 22
- 230000006835 compression Effects 0.000 claims abstract description 21
- 239000012530 fluid Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims 1
- 239000003921 oil Substances 0.000 abstract description 157
- 230000009471 action Effects 0.000 abstract description 6
- 239000010721 machine oil Substances 0.000 abstract description 2
- 238000006073 displacement reaction Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 5
- 239000010729 system oil Substances 0.000 description 5
- 239000010687 lubricating oil Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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Abstract
The oil pump pressure limiting valve capable of reducing pressure fluctuation relates to the technical field of oil pumps and comprises a pressure limiting valve body arranged on an oil pump, wherein an oil cavity and a plunger capable of moving left and right in the oil cavity are arranged in the pressure limiting valve body, the left end of the oil cavity is sealed with a screw plug, the right end of the oil cavity is communicated with a high-pressure oil leading port, one side of the oil cavity is provided with an oil drainage port, a compression spring is arranged in the oil cavity, the left end and the right end of the compression spring are respectively abutted against the screw plug and the plunger, under the elastic force action of the compression spring, the plunger can be abutted against the right end of the oil cavity and seals the high-pressure oil leading port and the oil drainage port, the pressure limiting valve body is provided with an oil hole communicated with the oil cavity on the left side of the plunger. The utility model discloses the accessible slows down the displacement rate of plunger and reduces the pressure fluctuation of machine oil to ensure high-speed oil pressure safety.
Description
Technical Field
The utility model belongs to the technical field of the oil pump technique and specifically relates to indicate an oil pump pressure limiting valve that can reduce pressure fluctuation.
Background
The oil pump is used for ensuring that lubricating oil circularly flows in a lubricating system and can provide enough lubricating oil at each rotating speed of the engine so as to maintain enough lubricating oil pressure and ensure the lubrication of the engine. To prevent the oil pressure from being too high, a pressure limiting valve is usually provided in the lubrication circuit. When the engine oil pressure of the system is too high, the oil can enter the pressure limiting valve and push the plunger, so that the spring is compressed and retreated by the plunger, and the oil drain port is opened to drain the oil so as to achieve the purpose of reducing the system pressure.
When the engine is in rapid speed rise or rapid speed reduction, the pressure limiting valve can be instantly opened or closed, and the rapid opening and closing action of the pressure limiting valve can increase the fluctuation of the oil pressure of the system.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an oil pump pressure limiting valve reduces the pressure oscillation of machine oil through the translation rate that slows down the plunger.
In order to solve the technical problem, the utility model discloses a following technical scheme: the oil pump pressure limiting valve capable of reducing pressure fluctuation comprises a pressure limiting valve body arranged on an oil pump, wherein an oil cavity and a plunger capable of moving left and right in the oil cavity are arranged in the pressure limiting valve body, a screw plug is arranged at the left end of the oil cavity in a sealing mode, a high-pressure oil leading port is communicated with the right end of the oil cavity, an oil drainage port is formed in one side of the oil cavity, a compression spring is arranged in the oil cavity, the left end and the right end of the compression spring are respectively abutted against the screw plug and the plunger, under the elastic force action of the compression spring, the plunger can be abutted against the right end of the oil cavity and can block the high-pressure oil leading port and the oil drainage port, an oil hole communicated with the oil cavity on the left side of the plunger is formed in the pressure limiting valve body.
Preferably, the diameter of the oil hole is smaller than that of the high-pressure oil guide hole.
More preferably, the oil hole is located near a left end of the oil chamber.
More preferably, the left end of the plunger is provided with a guide groove for the compression spring to extend into.
More preferably, the right end of the screw plug is provided with a positioning groove for the compression spring to extend into.
The utility model discloses a theory of operation is: the oil cavity on the left side of the plunger is provided with the oil hole communicated with the high-pressure oil leading port, so that oil of the high-pressure oil leading port can enter the oil cavity, when the oil pressure of the system rises instantly, the oil of the high-pressure oil leading port can push the plunger to move leftwards, the plunger can extrude the oil in the oil cavity, and due to the existence of the throttling hole, the oil in the oil cavity is discharged from the oil hole at a relatively slow speed, so that certain resistance is generated on the plunger, the moving speed of the plunger is slowed down, the phenomenon that the oil draining port is opened instantly and completely due to the fact that the plunger moves too fast is avoided, the pressure fluctuation of the oil is effectively reduced, and the safety of high-speed oil; in a similar way, when system oil hydraulic pressure reduced in the twinkling of an eye, compression spring can promote the plunger and move to the right, nevertheless at the in-process that the plunger moved to the right, because the left oil pocket volume of plunger can grow gradually, consequently can produce local negative pressure and make the oilhole inhale fluid, and because the existence of orifice, fluid is relatively slow from the speed that the oilhole was inhaled the oil pocket this moment, consequently produced certain resistance to the plunger to also can slow down the translation rate of plunger.
Drawings
Fig. 1 is a schematic view of the overall structure in the embodiment of the present invention.
The reference signs are:
1-pressure limiting valve body 2-oil cavity 3-plunger
3 a-guide groove 4-plug screw 4 a-positioning groove
5-high pressure oil leading port 6-oil drain port 7-compression spring
8-oil hole 9-oil passage 10-throttle hole.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention.
It should be noted that, in the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Furthermore, in the present disclosure, unless explicitly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature. The terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1, the oil pump pressure limiting valve capable of reducing pressure fluctuation comprises a pressure limiting valve body 1 arranged on an oil pump, an oil cavity 2 and a plunger 3 capable of moving left and right in the oil cavity 2 are arranged in the pressure limiting valve body 1, a screw plug 4 is sealed at the left end of the oil cavity 2, a high-pressure oil leading port 5 is communicated with the right end of the oil cavity 2, an oil drainage port 6 is formed in one side of the oil cavity 2, a compression spring 7 is arranged in the oil cavity 2, the left end and the right end of the compression spring 7 are respectively abutted against the screw plug 4 and the plunger 3, the plunger 3 can be abutted against the right end of the oil cavity 2 and seals the high-pressure oil leading port 5 and the oil drainage port 6 under the elastic force action of the compression spring 7, an oil hole 8 communicated with the oil cavity 2 on the left side of the plunger 3 is formed in the.
The oil pump pressure limiting valve capable of reducing pressure fluctuation provided by the embodiment has the advantages that the pressure limiting valve body 1 can be arranged on an oil pump, the high-pressure oil leading port 5 is communicated with a main oil duct of the oil pump, and when the oil pressure of the system is overlarge, the oil can enter the high-pressure oil leading port 5 and push the plunger 3 to move, and then enters the oil cavity 2 and is discharged from the oil drainage port 6 to realize pressure relief.
In the specific working process, the oil hole 8 communicated with the high-pressure oil leading port 5 is formed in the oil cavity 2 on the left side of the plunger 3, so that oil of the high-pressure oil leading port 5 can enter the oil cavity 2, when the system oil pressure is instantly increased, the oil of the high-pressure oil leading port 5 can push the plunger 3 to move leftwards, the plunger 3 can extrude the oil in the oil cavity 2, the oil flows into the oil duct 9 from the oil hole 8 and is discharged into the high-pressure oil leading port 5 through the throttle hole 10, and due to the existence of the throttle hole 10, the speed of discharging the oil from the oil hole 8 in the oil cavity 2 is relatively slow, so that certain resistance is generated on the plunger 3, the moving speed of the plunger 3 is reduced, the phenomenon that the oil discharging port 6 is instantly and completely opened due to the fact that the plunger 3 moves too fast is avoided, the oil is effectively reduced, and high-speed oil pressure fluctuation safety. It will be appreciated by those skilled in the art that due to the presence of the restriction orifice 10, the oil pressure in the oil chamber 2 is actually much lower than the oil pressure at the high pressure oil port 5, and therefore there is no fear of affecting the normal opening action of the pressure limiting valve at all.
It should be noted that the principle that the above structure ensures the safety of the high-speed oil pressure is that the higher the rotation speed is, the larger the flow demand of the engine is, the larger the pressure drop from the high-pressure oil lead port 5 to the main oil gallery is, and the opening pressure of the pressure limiting valve is fixed, that is, when the oil pressure at the high-pressure oil lead port 5 reaches the opening pressure of the pressure limiting valve, the pressure limiting valve is opened. Because the higher the rotating speed is, the larger the flow rate is, the larger the pressure drop is, which may cause the oil pressure of the main oil gallery to be reduced more when the rotating speed is higher (for example, when the opening pressure of the pressure limiting valve is designed to be 500KPa, the flow rate requirement facing the rotating speed a is Q1, and the pressure drop from the high pressure oil inlet 5 to the main oil gallery is 100KPa at this time, the pressure of the main oil gallery is 400KPa, and when the rotating speed is higher B, the flow rate is increased to Q2, so that the pressure drop from the high pressure oil inlet 5 to the main oil gallery is increased to 120KPa, and the pressure of the main oil gallery is 380KPa at this time, so that the pressure of the main oil gallery is reduced more, thereby affecting the safety under the high rotating speed condition to a certain extent, the pressure limiting valve provided by this embodiment can reduce the occurrence of this phenomenon to a great extent, and by slowing down the moving speed of the plunger 3, the oil drainage process is slower, so that the oil pressure in the main oil gallery under the high rotating speed is not reduced to, thereby ensuring high-speed oil pressure safety to a certain extent.
When the system oil pressure reduces in the twinkling of an eye, compression spring 7 can promote plunger 3 and move to the right, but in the process that plunger 3 moves to the right, because the oil pocket 2 volume on the left of plunger 3 can grow gradually, consequently can produce local negative pressure and make oilhole 8 inhale oil, this oil can draw oil port 5 from high-pressure oil and get into oil duct 9 and reentry oilhole 8 through orifice 10, and because the existence of orifice 10, the speed that oil was inhaled oil pocket 2 from oilhole 8 at this moment can be slow relatively, consequently produced certain resistance to plunger 3 to also can slow down the moving speed of plunger 3.
In fact, it will be appreciated by those skilled in the art that by providing the oil hole 8 and controlling the flow rate of the oil passing through the oil hole 8 by using the orifice 10, the structure of the plunger 3, the oil chamber 2 and the oil hole 8 is made similar to a syringe, and when the syringe sucks or injects a medicine, the piston thereof also obtains resistance due to the slow flow of the liquid in the syringe. It can be seen that the pressure limiting valve in the above embodiment can effectively avoid the over-high moving speed of the plunger 3 when the pressure of the system oil is instantaneously increased or decreased, so as to prevent the pressure of the system oil from fluctuating too much.
Preferably, the diameter of the oil hole 8 is smaller than that of the high-pressure oil lead-out port 5, so that the oil entering and exiting the oil hole 8 can be slowed down more by the action of the throttle hole 10 in the oil passage 9, which is beneficial to slow down the moving speed of the plunger 3, and the oil hole 8 is positioned near the left end of the oil chamber 2.
In addition, in this embodiment, the left end of the plunger 3 is provided with a guide groove 3a for the compression spring 7 to extend into, so that the compression spring 7 is more stable during operation, and similarly, the right end of the plug screw 4 is further provided with a positioning groove 4a for the compression spring 7 to extend into.
The above-mentioned embodiment is the utility model discloses the implementation scheme of preferred, in addition, the utility model discloses can also realize by other modes, any obvious replacement is all within the protection scope of the utility model under the prerequisite that does not deviate from this technical scheme design.
In order to make it easier for those skilled in the art to understand the improvement of the present invention over the prior art, some drawings and descriptions of the present invention have been simplified, and in order to clarify, some other elements have been omitted from this document, those skilled in the art should recognize that these omitted elements may also constitute the content of the present invention.
Claims (5)
1. Can reduce oil pump pressure limiting valve of pressure fluctuation, including being used for setting up pressure limiting valve body (1) on the oil pump, be equipped with oil pocket (2) in pressure limiting valve body (1) and can move plunger (3) about in oil pocket (2), the left end seal of oil pocket (2) is equipped with plug screw (4), the right-hand member intercommunication has high-pressure oil to lead hydraulic fluid port (5), drain port (6) have been seted up to one side of oil pocket (2), be equipped with compression spring (7) in oil pocket (2) just the left and right both ends of compression spring (7) are supported respectively and are leaned on plug screw (4) and plunger (3) under the elastic force effect of compression spring (7), plunger (3) can support and lean on in the right-hand member of oil pocket (2) and shutoff high-pressure oil to lead hydraulic fluid port (5) and drain port (6), its characterized in that: the pressure limiting valve is characterized in that an oil hole (8) communicated with an oil cavity (2) on the left side of the plunger (3) is formed in the pressure limiting valve body (1), the high-pressure oil leading port (5) is communicated with the oil hole (8) through an oil duct (9), and a throttling hole (10) is formed in the oil duct (9).
2. The oil pump pressure limiting valve capable of reducing pressure fluctuations of claim 1, characterized in that: the diameter of the oil hole (8) is smaller than that of the high-pressure oil leading port (5).
3. The oil pump pressure limiting valve capable of reducing pressure fluctuations of claim 2, characterized in that: the position of the oil hole (8) is close to the left end of the oil cavity (2).
4. The oil pump pressure limiting valve capable of reducing pressure fluctuations of claim 3, wherein: the left end of the plunger (3) is provided with a guide groove (3 a) for the compression spring (7) to extend into.
5. The oil pump pressure limiting valve capable of reducing pressure fluctuations of claim 4, wherein: and the right end of the screw plug (4) is provided with a positioning groove (4 a) for the compression spring (7) to extend into.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021650876.8U CN212744106U (en) | 2020-08-11 | 2020-08-11 | Oil pump pressure limiting valve capable of reducing pressure fluctuation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021650876.8U CN212744106U (en) | 2020-08-11 | 2020-08-11 | Oil pump pressure limiting valve capable of reducing pressure fluctuation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212744106U true CN212744106U (en) | 2021-03-19 |
Family
ID=74987344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021650876.8U Active CN212744106U (en) | 2020-08-11 | 2020-08-11 | Oil pump pressure limiting valve capable of reducing pressure fluctuation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212744106U (en) |
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2020
- 2020-08-11 CN CN202021650876.8U patent/CN212744106U/en active Active
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: No.69 Beizheng street, Chengguan Town, Hengdong County, Hengyang City, Hunan Province Patentee after: Hunan Meihu Intelligent Manufacturing Co.,Ltd. Country or region after: China Address before: No.69 Beizheng street, Chengguan Town, Hengdong County, Hengyang City, Hunan Province Patentee before: Hunan Oil Pump Co.,Ltd. Country or region before: China |