Piston cooling nozzle structure and engine

Abstract

The present invention relates to the field of engine technology, and in particular to a piston cooling nozzle structure and an engine. The piston cooling nozzle structure includes a support seat, the support seat being provided with a nozzle oil inlet passage and an engine body oil inlet passage connected to a main oil passage; a lower bearing shell, the lower bearing shell being arranged on the inner side of the support seat, the lower bearing shell being provided with a lower notch connected to the engine body oil inlet passage; a bearing cap, the bearing cap being connected to the support seat via an oil inlet bolt, an oil inlet passage being provided between the oil inlet bolt, the bearing cap, and the support seat; an upper bearing shell being arranged on the inner side of the bearing cap, the upper bearing shell being provided with an upper notch, the bearing cap being provided with a bearing cap oil inlet passage connected to both the oil inlet passage and the upper notch, and the oil inlet passage being connected to the nozzle oil inlet passage; and a crankshaft, the crankshaft being rotatably arranged between the upper bearing shell and the lower bearing shell, the crankshaft being provided with a crankshaft oil passage. The present invention can effectively cool the piston while reducing the power consumption of the engine oil pump.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to a piston cooling nozzle structure and an engine. Background Art

[0002] The piston is one of the engine's key moving parts, playing a critical role in improving engine emissions, enhancing fuel economy, and reducing fuel consumption. Pistons operate under demanding conditions of high temperature, high pressure, and high speed, subjecting themselves to significant thermal and shock loads. In recent years, engines have steadily evolved toward higher power density, higher boost pressure, and lower energy consumption. This continuous increase in power density and level of refinement translates to increased engine thermal loads. Excessive thermal loads can increase combustion chamber and piston temperatures, making the piston susceptible to thermal fatigue cracking, cylinder scuffing, and burning, impacting piston reliability and stability. Currently, piston cooling nozzles are primarily used to reduce piston temperature. These nozzles are mounted on the engine block and draw oil from the engine's oil passages. During engine operation, the piston cooling nozzles spray cooling oil onto the heat-loaded pistons. The cooler cooling oil then removes heat from the pistons through heat exchange, cooling the pistons.

[0003] To adjust the piston cooling nozzle's oil flow rate according to varying engine loads, a control valve is installed between the piston cooling nozzle and the oil passage. This control valve adjusts the opening size of the control valve based on signals from the ECU, controlling the piston cooling nozzle's oil flow rate. This more precisely meets piston cooling requirements. Using this control method for the piston cooling nozzle, the piston cooling nozzle remains in a continuous spraying state as the piston moves between the upper and lower dead centers of the cylinder. When the piston is at top dead center, the piston cooling nozzle is far from the piston's oscillation cooling chamber. Consequently, the oil sprayed from the piston cooling nozzle often cannot fully reach the oscillation cooling chamber inlet at the top of the piston, resulting in significant oil waste. This ineffective cooling of the piston also increases the power consumption of the oil pump.

[0004] Therefore, a piston cooling nozzle structure and an engine are needed to solve the above problems. Summary of the Invention

[0005] The object of the present invention is to provide a piston cooling nozzle structure and an engine, which can effectively cool the piston and reduce the power consumption of the oil pump.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] The piston cooling nozzle structure includes:

[0008] A support seat, wherein the support seat is provided with a nozzle oil inlet passage and a body oil inlet passage communicating with the main oil passage;

[0009] A lower bearing shell is arranged on the inner side of the support seat, and a lower notch is opened on the lower bearing shell and is connected to the oil inlet passage of the engine body;

[0010] A bearing cover, wherein the bearing cover is connected to the support seat via an oil inlet bolt, an oil inlet passage is defined between the oil inlet bolt, the bearing cover, and the support seat, an upper bearing shell is provided on the inner side of the bearing cover, the upper bearing shell is provided with an upper notch, a bearing cover oil inlet passage is defined on the bearing cover, the bearing cover being connected to both the oil inlet passage and the upper notch, and the oil inlet passage is connected to the nozzle oil inlet passage;

[0011] A crankshaft is rotatably arranged between the upper bearing and the lower bearing, and a crankshaft oil passage is opened on the crankshaft. When the piston of the engine is at the bottom dead center position, the crankshaft oil passage is connected with the lower notch and the upper notch. When the piston of the engine is at the top dead center position, the crankshaft oil passage is disconnected from the lower notch and the upper notch.

[0012] Furthermore, the crankshaft oil passage includes a crankshaft oil inlet passage and a crankshaft oil outlet passage that are connected to each other, the crankshaft oil inlet passage can be connected to the lower notch, and the crankshaft oil outlet passage can be connected to the upper notch.

[0013] Furthermore, an oil inlet expansion chamber is provided on the crankshaft, and the oil inlet expansion chamber is located between the lower notch and the crankshaft oil inlet passage.

[0014] Furthermore, the oil inlet expansion chamber is arc-shaped, and the crankshaft oil inlet passage is connected to the middle of the oil inlet expansion chamber.

[0015] Furthermore, an oil outlet expansion chamber is provided on the crankshaft, and the oil outlet expansion chamber is located between the upper notch and the crankshaft oil outlet passage. The oil outlet expansion chamber is arc-shaped, and the crankshaft oil outlet passage is connected to the middle of the oil outlet expansion chamber.

[0016] Furthermore, the oil inlet bolt includes a first screw and a second screw, the first screw is inserted into the mounting hole of the bearing cover, and the first screw and the mounting hole have an annular gap, the annular gap is connected to the oil inlet channel of the bearing cover, the second screw is screwed to the mounting hole and the docking hole on the support seat, the second screw has a hollow hole along its own axial direction, the hollow hole is connected to the annular gap and the nozzle oil inlet channel, and the hollow hole and the annular gap form the oil inlet channel.

[0017] Furthermore, the first screw and the second screw are spaced apart to form a transverse oil passage, and the transverse oil passage is communicated with both the hollow hole and the annular gap.

[0018] Furthermore, the cross-sectional area of ​​the lower notch is larger than the cross-sectional area of ​​the oil inlet passage of the engine body, and the cross-sectional area of ​​the upper notch is larger than the cross-sectional area of ​​the oil inlet passage of the bearing cover.

[0019] Furthermore, a control valve is provided in series between the main oil passage and the engine body oil inlet passage, and the opening of the control valve can be adjusted.

[0020] An engine comprises an engine body and the piston cooling nozzle structure as described above, wherein the piston cooling nozzle structure is arranged on the engine body.

[0021] Beneficial effects of the present invention:

[0022] The present invention provides a piston cooling nozzle structure, wherein a nozzle oil inlet passage and an engine oil inlet passage connected to the main oil passage are provided on the support seat. A lower bearing is provided on the inner side of the support seat, and a lower notch connected to the engine oil inlet passage is provided on the lower bearing. The bearing cover is connected to the support seat by an oil inlet bolt, and an oil inlet passage is provided between the oil inlet bolt, the bearing cover and the support seat. An upper bearing is provided on the inner side of the bearing cover, and an upper notch is provided on the upper bearing. A bearing cover oil inlet passage connected to both the oil inlet passage and the upper notch is provided on the bearing cover, and the oil inlet passage is connected to the nozzle oil inlet passage. The crankshaft is rotatably provided between the upper bearing and the lower bearing, and a crankshaft oil passage is provided on the crankshaft. When the piston of the engine is at the bottom dead center position, the crankshaft oil passage is connected to the lower notch and the upper notch. As the crankshaft rotates, the piston cooling nozzles are connected or closed based on the crankshaft's rotation angle. When the piston is at top dead center, the crankshaft oil passage is disconnected from the upper and lower notches, preventing the piston cooling nozzles from spraying oil to cool the piston. When the piston is at bottom dead center, the crankshaft oil passage is connected to the upper and lower notches, allowing the piston cooling nozzles to spray oil to cool the piston. This arrangement prevents the piston cooling nozzles from continuously spraying oil throughout the engine's operating cycle. Oil is only sprayed when the piston is near bottom dead center and close to the piston cooling nozzles, reducing oil consumption and the power consumption of the oil pump.

[0023] The present invention provides an engine comprising an engine body and the piston cooling nozzle structure as described above, which can effectively cool the piston while reducing the power consumption of the oil pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in describing the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without any creative work.

[0025] Figure 1This is a cross-sectional view of the crankshaft when the piston is at the bottom dead center in a piston cooling nozzle structure of the present invention;

[0026] Figure 2 This is a cross-sectional view of a crankshaft when the piston is at the top dead center in a piston cooling nozzle structure of the present invention;

[0027] Figure 3 This is a schematic diagram of a piston cooling nozzle structure according to the present invention, showing the piston at the bottom dead center;

[0028] Figure 4 This is a schematic diagram of a piston cooling nozzle structure of the present invention, in which the piston is at the top dead center.

[0029] In the picture:

[0030] 1. Main oil channel; 2. Support seat; 21. Engine body oil inlet channel; 3. Lower bearing; 31. Lower notch; 4. Bearing cover; 41. Bearing cover oil inlet channel; 5. Upper bearing; 51. Upper notch; 6. Oil inlet bolt; 61. First screw; 62. Second screw; 63. Annular gap; 64. Transverse oil channel; 7. Crankshaft; 71. Crankshaft oil inlet channel; 72. Crankshaft oil outlet channel; 73. Oil inlet expansion chamber; 74. Oil outlet expansion chamber; 8. Piston cooling nozzle; 81. Nozzle oil inlet channel; 82. Oil injection pipe; 9. Piston. DETAILED DESCRIPTION

[0031] Before any embodiments of the present application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the foregoing drawings.

[0032] In this application, the terms "comprises," "includes," "has," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0033] In this application, the terms "connect," "combine," "couple," and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without an intermediary, and an indirect connection refers to two parts or components being connected to at least one intermediary, with the two parts or components being connected via the intermediary. Furthermore, "connect" and "couple" are not limited to physical or mechanical connections or couplings and may include electrical connections or couplings.

[0034] In this application, it will be understood by those skilled in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerance caused by manufacturing, assembly, use, etc. associated with a specific value. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0035] In this application, it will be understood by those skilled in the art that the function performed by an assembly can be performed by one assembly, multiple assemblies, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one assembly, or a combination of multiple parts.

[0036] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to the other element "upper" or "lower", but also be indirectly connected to the other element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, below can include directly below, lower left, lower right, lower front and lower back, etc.

[0037] In order to effectively cool the piston and reduce the power consumption of the oil pump, Figure 1-Figure 4 As shown, the present invention provides a piston cooling nozzle structure. The piston cooling nozzle structure includes a support seat 2, a lower bearing shell 3, a bearing cover 4 and a crankshaft 7.

[0038] The support base 2 is provided with a nozzle oil inlet passage 81 and an engine oil inlet passage 21 connected to the main oil passage 1. A lower bearing shell 3 is disposed on the inner side of the support base 2 and is provided with a lower notch 31 connected to the engine oil inlet passage 21. The bearing cap 4 is connected to the support base 2 via an oil inlet bolt 6. An oil inlet passage is defined between the oil inlet bolt 6, the bearing cap 4, and the support base 2. An upper bearing shell 5 is disposed on the inner side of the bearing cap 4 and is provided with an upper notch 51. The bearing cap 4 is provided with a bearing cap oil inlet passage 41 connected to both the oil inlet passage and the upper notch 51. The oil inlet passage is connected to the nozzle oil inlet passage 81. A crankshaft 7 is rotatably disposed between the upper bearing shell 5 and the lower bearing shell 3. A crankshaft oil passage is provided on the crankshaft 7. When the engine's piston 9 is at bottom dead center, the crankshaft oil passage is connected to the lower notch 31 and the upper notch 51. When the engine's piston 9 is at top dead center, the crankshaft oil passage is disconnected from the lower notch 31 and the upper notch 51.

[0039] As crankshaft 7 rotates, piston cooling nozzle 8 is controlled to be connected or closed according to the rotation angle of crankshaft 7. When piston 9 is at top dead center, the crankshaft oil passage is disconnected from upper notch 51 and lower notch 31, preventing piston cooling nozzle 8 from spraying oil to cool piston 9. When piston 9 is at bottom dead center, the crankshaft oil passage is connected to upper notch 51 and lower notch 31, allowing piston cooling nozzle 8 to spray oil to cool piston 9. This arrangement prevents piston cooling nozzle 8 from continuously spraying oil throughout the engine's operating cycle. Oil is only sprayed when piston 9 is near bottom dead center and close to piston cooling nozzle 8, reducing oil consumption and the power consumption of the oil pump.

[0040] Furthermore, the crankshaft oil passage includes a crankshaft oil inlet passage 71 and a crankshaft oil outlet passage 72 that are interconnected. The crankshaft oil inlet passage 71 can communicate with the lower notch 31, and the crankshaft oil outlet passage 72 can communicate with the upper notch 51. By designing the crankshaft oil passage as a two-section structure of the crankshaft oil inlet passage 71 and the crankshaft oil outlet passage 72, machining on the crankshaft 7 is facilitated.

[0041] Furthermore, an oil inlet expansion chamber 73 is formed on the crankshaft 7, and is located between the lower notch 31 and the crankshaft oil inlet passage 71. The provision of the oil inlet expansion chamber 73 increases the communication area between the crankshaft oil inlet passage 71 and the lower notch 31. When the piston 9 moves toward the bottom dead center, the crankshaft oil inlet passage 71 is connected to the oil inlet expansion chamber 73 when the piston 9 reaches the bottom dead center, thereby allowing engine oil to enter the crankshaft oil inlet passage 71.

[0042] Furthermore, the oil inlet expansion chamber 73 is arc-shaped, and the crankshaft oil inlet passage 71 is connected to the middle of the oil inlet expansion chamber 73. Through the above arrangement, the force balance of the crankshaft 7 can be ensured.

[0043] Furthermore, an oil outlet expansion chamber 74 is provided on the crankshaft 7. The oil outlet expansion chamber 74 is located between the upper notch 51 and the crankshaft oil outlet passage 72. The oil outlet expansion chamber 74 is arc-shaped, and the crankshaft oil outlet passage 72 is connected to the middle portion of the oil outlet expansion chamber 74. By providing the oil outlet expansion chamber 74, the connecting area between the crankshaft oil outlet passage 72 and the upper notch 51 can be increased. When the piston 9 moves toward the bottom dead center, the crankshaft oil outlet passage 72 can be connected to the oil outlet expansion chamber 74 when the piston 9 reaches the bottom dead center. This allows the engine oil to enter the upper notch 51, and then flow out through the bearing cover oil inlet passage 41, the oil inlet channel, and the nozzle oil inlet passage 81 to enter the piston cooling nozzle 8 for oil spray cooling of the piston 9. This arrangement can extend the duration of oil spray cooling, thereby ensuring the cooling effect on the piston 9.

[0044] Furthermore, the oil inlet bolt 6 includes a first screw 61 and a second screw 62. The first screw 61 is inserted into the mounting hole of the bearing cover 4, and the first screw 61 and the mounting hole have an annular gap 63. The annular gap 63 is connected to the bearing cover oil inlet passage 41. The second screw 62 is screwed to the mounting hole and the docking hole on the support seat 2. The second screw 62 has a hollow hole along its own axial direction. The hollow hole is connected to the annular gap 63 and the nozzle oil inlet passage 81. The hollow hole and the annular gap 63 form an oil inlet passage. By installing the second screw 62, the bearing cover 4 is fixedly connected to the support seat 2. The engine oil can enter the annular gap 63 through the bearing cover oil inlet passage 41, then enter the hollow hole through the annular gap 63, and finally enter the nozzle oil inlet passage 81 and enter the piston cooling nozzle 8 through the oil injection pipe 82 for oil injection cooling. The above arrangement reduces the difficulty of opening the oil inlet passage.

[0045] Furthermore, the first screw 61 and the second screw 62 are spaced apart to form a transverse oil passage 64, which is in communication with the hollow hole and the annular gap 63. The transverse oil passage is provided to facilitate the circulation of the engine oil.

[0046] Furthermore, the cross-sectional area of ​​the lower notch 31 is larger than that of the engine body oil inlet passage 21, and the cross-sectional area of ​​the upper notch 51 is larger than that of the bearing cover oil inlet passage 41. This arrangement avoids throttling at the upper notch 51 and the lower notch 31, which would result in poor oil flow.

[0047] Furthermore, a control valve is connected in series between the main oil channel 1 and the engine oil inlet channel 21, and its opening is adjustable. Specifically, the opening of the control valve can be adjusted based on the engine load using a signal from the vehicle controller, thereby controlling the amount of oil sprayed from the piston cooling nozzles 8, more precisely meeting the cooling requirements of the pistons 9. Furthermore, during a cold start of the engine, the piston cooling nozzles 8 can be shut off for rapid engine warm-up. When the engine load is low and the piston 9 temperature is low, the amount of oil sprayed from the piston cooling nozzles 8 can be reduced, further minimizing the power consumption of the oil pump and lowering engine fuel consumption.

[0048] The working process of this piston cooling nozzle structure is as follows:

[0049] When the piston 9 of the engine moves to the vicinity of the bottom dead center (that is, near the piston cooling nozzle 8), the front edge of the oil inlet expansion chamber 73 at the front end of the crankshaft oil inlet passage 71 first contacts the lower notch 31. At this time, the engine oil will flow into the crankshaft oil inlet passage 71, and at the same time, the front edge of the oil outlet expansion chamber 74 at the outlet of the crankshaft oil outlet passage 72 also contacts the upper notch 51. The oil passage of the piston cooling nozzle 8 is connected and oil injection begins. As the engine continues to run, the crankshaft 7 rotates continuously, the oil inlet expansion chamber 73 at the front end of the crankshaft oil inlet passage 71 is still in contact with the lower notch 31, and at the same time, the oil outlet expansion chamber 74 at the outlet of the crankshaft oil outlet passage 72 is still in contact with the upper notch 51. The engine oil will flow to the piston cooling nozzle 8 through the engine body oil inlet passage 21, the crankshaft oil inlet passage 71, the crankshaft oil outlet passage 72, and the bearing cover oil inlet passage 41. As the crankshaft 7 continues to rotate, the piston 9 moves away from the bottom dead center (that is, away from the piston cooling nozzle 8). After the oil pump 75 is turned off, the oil inlet 73 at the oil outlet 74 of the crankshaft oil outlet passage 72 is turned off, and the oil inlet 73 at the oil outlet 74 of the crankshaft oil outlet passage 72 is turned off. During crankshaft 7 rotation, while the oil inlet expansion chamber 73 is connected to the upper notch 51, the oil outlet expansion chamber 74 is disconnected from the lower notch 31, disconnecting the oil path and preventing oil from being ejected from the piston cooling nozzle 8. The continuous rotation of crankshaft 7 prevents the piston cooling nozzle 8 from continuously spraying oil throughout the engine's operating cycle. Oil is only ejected when the piston 9 is near bottom dead center and close to the piston cooling nozzle 8. This reduces oil consumption, lowers the power consumption of the oil pump, and lowers fuel consumption for the dispenser.

[0050] This embodiment further provides an engine comprising an engine body and the above-described piston cooling nozzle structure, which is disposed on the engine body. This prevents the piston cooling nozzle 8 from continuously spraying oil throughout the engine operating cycle, and instead sprays oil only when the piston 9 is near bottom dead center and close to the piston cooling nozzle 8. This reduces oil consumption, lowers the power consumption of the oil pump, and lowers fuel consumption in the dispensing engine.

[0051] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. The piston cooling nozzle structure is characterized by: include: A support seat (2), wherein the support seat (2) is provided with a nozzle oil inlet passage (81) and a body oil inlet passage (21) communicating with the main oil passage (1); A lower bearing bush (3), the lower bearing bush (3) being arranged on the inner side of the support seat (2), and the lower bearing bush (3) being provided with a lower notch (31) communicating with the engine body oil inlet passage (21); A bearing cover (4), the bearing cover (4) and the support seat (2) are connected via an oil inlet bolt (6), an oil inlet passage is provided between the oil inlet bolt (6), the bearing cover (4) and the support seat (2), an upper bearing shell (5) is provided on the inner side of the bearing cover (4), the upper bearing shell (5) is provided with an upper notch (51), a bearing cover oil inlet passage (41) is provided on the bearing cover (4) and is in communication with both the oil inlet passage and the upper notch (51), and the oil inlet passage is in communication with the nozzle oil inlet passage (81); A crankshaft (7) is rotatably arranged between the upper bearing shell (5) and the lower bearing shell (3). A crankshaft oil passage is provided on the crankshaft (7). When the piston (9) of the engine is at the bottom dead center position, the crankshaft oil passage is communicated with the lower notch (31) and the upper notch (51). When the piston (9) of the engine is at the top dead center position, the crankshaft oil passage is disconnected from the lower notch (31) and the upper notch (51).

2. The piston cooling nozzle structure according to claim 1, characterized in that: The crankshaft oil passage comprises a crankshaft oil inlet passage (71) and a crankshaft oil outlet passage (72) that are in communication with each other. The crankshaft oil inlet passage (71) can be in communication with the lower notch (31), and the crankshaft oil outlet passage (72) can be in communication with the upper notch (51).

3. The piston cooling nozzle structure according to claim 2, characterized in that: An oil inlet expansion chamber (73) is provided on the crankshaft (7), and the oil inlet expansion chamber (73) is located between the lower notch (31) and the crankshaft oil inlet passage (71).

4. The piston cooling nozzle structure according to claim 3, characterized in that: The oil inlet expansion chamber (73) is arc-shaped, and the crankshaft oil inlet passage (71) is connected to the middle of the oil inlet expansion chamber (73).

5. The piston cooling nozzle structure according to claim 2, characterized in that: An oil outlet expansion chamber (74) is provided on the crankshaft (7), and the oil outlet expansion chamber (74) is located between the upper notch (51) and the crankshaft oil outlet passage (72). The oil outlet expansion chamber (74) is arc-shaped, and the crankshaft oil outlet passage (72) is connected to the middle of the oil outlet expansion chamber (74).

6. The piston cooling nozzle structure according to claim 1, characterized in that: The oil inlet bolt (6) includes a first screw rod (61) and a second screw rod (62), the first screw rod (61) is inserted into the mounting hole of the bearing cover (4), and an annular gap (63) is formed between the first screw rod (61) and the mounting hole, the annular gap (63) is connected to the bearing cover oil inlet passage (41), the second screw rod (62) is screwed to the mounting hole and the docking hole on the support seat (2), the second screw rod (62) is provided with a hollow hole along its own axial direction, the hollow hole is connected to the annular gap (63) and the nozzle oil inlet passage (81), and the hollow hole and the annular gap (63) form the oil inlet passage.

7. The piston cooling nozzle structure according to claim 6, characterized in that: The first screw (61) and the second screw (62) are spaced apart to form a transverse oil passage (64), and the transverse oil passage (64) is communicated with both the hollow hole and the annular gap (63).

8. The piston cooling nozzle structure according to claim 1, characterized in that: The cross-sectional area of ​​the lower notch (31) is larger than the cross-sectional area of ​​the engine body oil inlet passage (21), and the cross-sectional area of ​​the upper notch (51) is larger than the cross-sectional area of ​​the bearing cover oil inlet passage (41).

9. The piston cooling nozzle structure according to claim 1, characterized in that: A control valve is provided in series between the main oil passage (1) and the engine body oil inlet passage (21), and the opening of the control valve can be adjusted.

10. An engine, characterized in that The invention comprises an engine body and a piston cooling nozzle structure according to any one of claims 1 to 9, wherein the piston cooling nozzle structure is arranged on the engine body.

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