Oil pump capable of optimizing noise problem of first starting after long-term standing

Abstract

An oil pump capable of optimizing the noise problem of first starting after long-term standing relates to the technical field of variable displacement vane pumps, and comprises a pump body, a sliding block is arranged in an oil cavity of the pump body, a vane cavity is arranged in the sliding block, a vane is arranged in the vane cavity, an oil storage cavity capable of storing oil during shutdown is arranged in the pump body, and the vane is arranged in the oil storage cavity. A pressure discharging hole used for discharging excessive oil is formed in the upper portion of the oil storage cavity, the lowest point of the oil storage cavity is located at the lowest point of the pump body oil cavity, and the oil in the oil storage cavity can enter the sliding block from the end face gap of the sliding block so as to be used for rapidly providing oil for the blade cavity during starting. According to the utility model, the technical effects that the oil pressure is fast and stable, the blades are fast lubricated and the air mixing amount is relatively low after long-term standing during first-time starting can be realized, and the blade knocking abnormal sound is weakened to a great extent.

Description

Technical Field

[0001] This utility model relates to the field of variable displacement vane pump technology, and in particular to an oil pump that can optimize the noise problem during the first start-up after a long period of inactivity. Background Technology

[0002] Variable displacement vane pumps are core components of internal combustion engine lubrication systems, dynamically controlling oil pressure by adjusting displacement. The key structures of a traditional variable displacement vane pump include the pump shaft, vanes, slide block, feedback chamber, and discharge chamber. The oscillation of the slide block controls displacement adjustment, while the dynamic balance of oil pressure in the feedback chamber directly affects the pump's output characteristics.

[0003] When the engine is shut down for an extended period (such as overnight), the oil in the pump body flows back to the oil pan due to gravity, causing oil loss from the vanes, slider end faces, and gaps between pump chamber components. Upon initial startup, the pump chamber needs to be refilled with oil, but traditional vane pumps cannot quickly provide sufficient initial oil, resulting in a short period of "dry friction" between components, leading to the following problems:

[0004] 1. Greater risk of air intake: If the gap is not filled with oil in time, air can be easily drawn into the pump chamber from the end face, which will disrupt the stability of the oil pressure.

[0005] 2. Abnormal knocking noise from the blades: Insufficient lubrication between the blades and the pump body causes abnormal noise when the blades collide with the pump body at startup. Utility Model Content

[0006] The purpose of this invention is to provide an oil pump that can optimize the noise problem during the first start after a long period of inactivity, thereby reducing the amount of air intake and blade knocking noise during the first start.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: an oil pump that optimizes the noise problem of the first start after long-term quiescence, comprising a pump body, a slider provided in the oil chamber of the pump body, a vane chamber provided in the slider and vanes provided in the vane chamber, an oil storage chamber provided inside the pump body for storing oil when the pump is stopped, a pressure discharge hole provided at the upper part of the oil storage chamber for discharging excess oil, the lowest point of the oil storage chamber being located at the lowest point of the oil chamber of the pump body, and the oil in the oil storage chamber being able to enter the slider from the gap at the end face of the slider to quickly provide oil to the vane chamber during startup.

[0008] Preferably, a feedback chamber is provided on the right side of the slider, and the oil storage chamber is located on the left side of the slider and is independent of the feedback chamber.

[0009] More preferably, the gap between the left side wall of the slider and the inner wall of the pump body forms the oil storage cavity.

[0010] More preferably, the left side of the slider is rotatably connected to the pump body via a pin to divide the oil storage chamber into an upper oil storage chamber and a lower oil storage chamber. The pump body inner wall located on the left side of the pin has a channel connecting the upper oil storage chamber and the lower oil storage chamber. The pressure relief hole is located in the upper oil storage chamber and is connected to the oil pan.

[0011] More preferably, the pump body is provided with an oil outlet passage that communicates with the blade cavity, and the inner wall of the oil outlet passage has an exhaust hole for quickly expelling air during startup.

[0012] More preferably, the diameter of the vent hole is 0.8-1.2 mm and the length is 4-6 mm.

[0013] Compared with the prior art, this utility model can actively store oil when the pump is stopped by setting an oil storage chamber inside the pump body, which prevents the oil from flowing back to the oil pan. The oil in the oil storage chamber can form an oil film seal on one side of the gap at part of the slider end face. At the moment of startup, the oil film can fill part of the gap, reduce the amount of air sucked into the blade cavity from the gap at the slider end face, thereby reducing the oil pressure fluctuation and pump cavity cavitation caused by gas mixing, and weakening the abnormal noise during startup.

[0014] Meanwhile, the pre-stored oil in the oil reservoir can directly enter the blade cavity through the end face gap, quickly forming a lubricating oil film between the blade and the cavity. This ensures that the blade is always enveloped in oil when it unfolds under centrifugal force, significantly reducing rigid collisions between the blade and the pump body and substantially reducing metallic knocking noise during startup. Furthermore, by designing the lowest point of the oil reservoir at the lowest point of the pump body's oil cavity, combined with gravity, it ensures that oil naturally accumulates in the oil reservoir when the pump stops. This allows the parts within the blade cavity to be coated with oil more quickly during startup. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure in the embodiment;

[0016] Figure 2 This is a schematic diagram of the pump body in the embodiment;

[0017] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure along the BB direction.

[0018] In the picture:

[0019] 1—Pump body; 2—Slider; 3—Impeller cavity

[0020] 4—Blade; 5—Oil reservoir; 6—Pressure discharge port

[0021] 7 – Pin; 8 – Exhaust port; 9 – Feedback chamber

[0022] 10 - Spring; 11 - Channel. Detailed Implementation

[0023] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0024] It should be noted in advance that, in this utility model, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. Furthermore, in this utility model, unless otherwise explicitly specified and limited, "on" or "below" a second feature can include direct contact between the first and second features, or contact between the first and second features not in direct contact but through another feature between them.

[0025] like Figure 1 As shown, an oil pump designed to optimize noise during first start-up after long-term inactivity includes a pump body 1. A slider 2 is disposed within the oil chamber of the pump body 1. A vane chamber 3 is disposed within the slider 2, and vanes 4 are disposed within the vane chamber 3. An oil reservoir 5 is provided inside the pump body 1 to store oil when the pump is stopped. A pressure discharge hole 6 is provided at the upper part of the oil reservoir 5 for discharging excess oil. The lowest point of the oil reservoir 5 is located at the lowest point of the oil chamber of the pump body 1. Oil in the oil reservoir 5 can enter the slider 2 through the gap at the end face of the slider 2 to quickly supply oil to the vane chamber 3 during startup. It should be noted that those skilled in the art should understand that the oil in the oil reservoir 5 comes from high-pressure oil leaking from the gap between the end face of the slider 2 and the pump body or pump cover during normal operation of the oil pump.

[0026] In the above structure, a feedback chamber 9 is located on the right side of slider 2, and an oil storage chamber 5 is located on the left side of slider 2 and is independent of the feedback chamber 9. The gap between the left side wall of slider 2 and the inner wall of pump body 1 forms the oil storage chamber 5. Those skilled in the art should know that the working principle of a variable displacement vane pump is that after oil enters the feedback chamber 9, the pressure of the oil in the feedback chamber 9 pushes slider 2 to swing, compressing the spring 10 in the slider arm, thereby changing the size of the oil outlet in vane chamber 3 and achieving the purpose of changing the displacement. The oil storage chamber 5 is located on the left side of slider 2, and the boundary between the oil storage chamber 5 and the feedback chamber 9 is separated by a seal against the inner wall of pump body 1. With this design, when slider 2 swings, only the oil pressure in the feedback chamber 9 participates in the displacement adjustment, while the oil storage chamber 5 independently maintains the oil storage function, avoiding mutual interference. Moreover, the oil storage chamber 5 is directly formed by the gap between the left side wall of slider 2 and the inner wall of pump body 1, eliminating the need for additional complex cavity structures and reducing processing costs.

[0027] In a conventional variable displacement vane pump structure, the slider is typically connected to the pump body via a pin to achieve oscillation. However, the pin separates the two cavities. For example, in this embodiment, the left side of the slider 2 is rotatably connected to the pump body 1 via a pin 7 to divide the oil storage chamber 5 into an upper oil storage chamber and a lower oil storage chamber. To connect the upper and lower oil storage chambers and increase the oil storage capacity, a channel 11 connecting the upper and lower oil storage chambers can be opened on the inner wall of the pump body 1 located to the left of the pin 7. The pressure discharge hole 6 is located in the upper oil storage chamber and connects to the oil pan. Under the action of gravity, the oil can naturally accumulate from the lower oil storage chamber to the upper oil storage chamber, significantly increasing the oil storage capacity until excess oil is discharged from the pressure discharge hole 6. This maximizes the oil storage volume within a limited space, ensuring that there is still sufficient oil in contact with the gap at the end face of the slider 2 after a long period of shutdown.

[0028] The design of the pressure relief hole 6 in this embodiment can prevent back pressure from forming in the oil storage chamber 5 and interfering with the swing of the slider 2. At the same time, the interconnected design of the pressure relief hole 6 ensures that the oil storage chamber 5 is always in an atmospheric pressure environment, eliminating the negative impact of oil static pressure on slider variable control.

[0029] In addition, in this embodiment, the inner wall of the oil outlet passage 7 that connects to the vane cavity 3 inside the pump body 1 is also provided with an exhaust hole 8 (such as...). Figure 2 and Figure 3 As shown in the diagram, the vent hole is small, with a diameter of 1mm and a length of 5mm. This tiny aperture prioritizes the expulsion of residual air from the oil passages during startup, preventing gas buildup and subsequent oil pressure fluctuations. This design is particularly suitable for situations with high gas content in the oil due to low temperatures or prolonged stagnation, allowing the oil pump to establish stable oil pressure within seconds. The size of the vent hole 8 is optimized to ensure rapid gas expulsion while preventing significant oil leakage. Actual oil leakage losses can be factored into preliminary calculations. Furthermore, in some chain-type oil pump structures, the pump body itself has a similarly sized drain hole for oil seepage to lubricate the chain; therefore, the vent hole 8 in this embodiment does not affect the operation of the oil pump.

[0030] The oil pump described above, which optimizes the noise issue during the first start-up after a long period of inactivity, allows the oil to flow back from the internal oil chamber of the pump body 1 to the oil pan under gravity during long-term inactivity (such as overnight storage). However, the oil storage chamber 5, located on the left side of the slider 2, can continuously accumulate oil because its lowest point is at the bottom of the oil chamber of the pump body 1. At the moment of startup, the pump shaft drives the blades 4 to rotate. The oil pre-stored in the oil storage chamber 5 can form an oil film sealing layer in the gap between the end face of the slider 2 and the pump body and pump cover, reducing the amount of air entering the blade cavity 3 from the gap at the end face of the slider 2. At the same time, the oil can also directly enter the blade cavity 3 from this gap, quickly wrapping the surface of the blades 4 and forming a lubricating film, reducing direct metal-to-metal collisions. During this process, the vent hole 8 on the inner wall of the oil outlet 7 preferentially discharges residual gas in the oil passage, avoiding gas retention that causes sudden changes in oil suction resistance. Meanwhile, the oil pressure in the feedback chamber 9 acts independently on the right side of the slider 2, pushing it to swing to adjust the displacement, without interfering with the sealing and oil supply function of the oil storage chamber 5. The aforementioned synergistic mechanism enables the oil pump to establish stable oil pressure within seconds of startup, eliminating blade knocking noises caused by lubrication delays or gas mixing.

[0031] This invention places the oil storage chamber 5 at the lowest point of the oil chamber in the pump body 1, and uses gravity to accumulate oil when the pump is stopped. During startup, an oil film sealing layer is formed in the gap between the end faces of some sliders 2, reducing the amount of air entering the blade cavity 3. At the same time, the oil stored in the oil storage chamber 5 can quickly enter the blade cavity 3, rapidly wrapping the blades 4 and establishing a lubricating film. Combined with the exhaust hole 8 of the oil outlet 7, residual gas is discharged. Ultimately, this invention achieves the technical effect of rapid and stable oil pressure, no dry friction or collision of blades, and low air mixing during the first startup after a long period of static storage. This greatly reduces blade knocking noise and significantly improves the starting reliability and service life of the oil pump.

[0032] To facilitate understanding by those skilled in the art of the improvements of this utility model compared to the prior art, some of the accompanying drawings and descriptions of this utility model have been simplified. The above embodiments are preferred implementations of this utility model. In addition, this utility model can be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. An oil pump capable of optimizing the noise problem of the first start after long-term standing, comprising a pump body (1), a sliding block (2) is arranged in the oil cavity of the pump body (1), a vane cavity (3) is arranged in the sliding block (2), and a vane (4) is arranged in the vane cavity (3), characterized in that: The pump body (1) is internally provided with an oil storage cavity (5) capable of storing oil when the machine is stopped, the upper part of the oil storage cavity (5) is provided with a pressure discharge hole (6) for discharging excess oil, the lowest point of the oil storage cavity (5) is located at the lowest point of the oil cavity of the pump body (1), and the oil in the oil storage cavity (5) can enter the slider (2) from the gap between the end faces of the slider (2) to quickly provide oil for the blade cavity (3) when starting. ​ 2. The oil pump that can optimize the noise problem at the first start after long-term standing according to claim 1, characterized in that: The right side of the slider (2) is provided with a feedback cavity (9), and the oil storage cavity (5) is located on the left side of the slider (2) and is independent of the feedback cavity (9).

3. The oil pump that can optimize the noise problem at the first start after long-term standing according to claim 2, characterized in that: The gap between the left side wall of the slider (2) and the inner wall of the pump body (1) forms the oil storage cavity (5).

4. The oil pump that optimizes the first start-up noise problem after long-term standing according to claim 3, characterized by: The left side of the slider (2) is rotatably connected to the pump body (1) through a pin shaft (7), so as to separate the oil storage cavity (5) into an upper oil storage cavity and a lower oil storage cavity, the inner wall of the pump body (1) on the left side of the pin shaft (7) is provided with a channel (11) communicating the upper oil storage cavity and the lower oil storage cavity, and the pressure discharge hole (6) is arranged in the upper oil storage cavity and communicates with the oil pan.

5. The oil pump that optimizes the first start-up noise problem after long-term standing according to claim 1, characterized by: The pump body (1) is provided with an oil outlet channel (7) communicating with the blade cavity (3), and the inner wall of the oil outlet channel (7) is provided with an air vent hole (8) for quickly discharging air when starting.

6. The oil pump that can optimize the noise problem at the first start after long-term standing according to claim 5, characterized in that: The diameter of the air vent hole (8) is 0.8-1.2mm, and the length is 4-6mm.

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