A crosshead pin for a diesel engine

Abstract

The utility model discloses a crosshead pin of diesel engine, include: main part and screw plug, the main part is provided with a plurality of oil channel hole, and the port place of oil channel hole is provided with first inclined plane, and the diesel engine needs to be lubricated when operating to carry out lubrication, and the oil channel hole is used for transporting lubricating oil. Screw plug includes the sealing head and the thread section who connects in proper order, and the outside of sealing head is provided with second inclined plane, and the inclination angle of first inclined plane and second inclined plane is same, and the thread section sets up in oil channel hole, and screw plug sets up in the port place of oil channel hole for sealing oil channel hole, and screw plug sets up in the end of oil channel hole, and screw plug is used for sealing oil channel hole, and screw plug includes sealing head and thread section, and the port place of oil channel hole is provided with first inclined plane, and the outside of sealing head is provided with second inclined plane, and the inclination angle of first inclined plane and second inclined plane is same, and first inclined plane and second inclined plane can completely adhere, and the problem such as the poor sealing effect brought by only through thread sealing in the past is solved.

Description

Technical Field

[0001] This utility model relates to the field of diesel engine parts, and in particular to a crosshead pin for diesel engines. Background Technology

[0002] During the operation of a low-speed diesel engine, the crosshead pin, as a key transmission component connecting the connecting rod and the crosshead, requires lubricating oil to achieve lubrication and cooling through its internal oil passages. The lubricating oil sealing plug is the core component that ensures the sealing of the internal oil passages of the crosshead pin.

[0003] In previous designs, the sealing fit between the lubricating oil sealing plug and the internal oil passage hole of the crosshead pin adopted a line contact sealing structure. That is, the sealing part of the plug is a single cylindrical surface, which forms a contact seal with the corresponding contact surface of the oil passage hole. This sealing method has extremely high requirements for installation accuracy. It depends entirely on the coaxiality, roundness and surface roughness of the contact surface between the plug and the oil passage hole. If there is a slight deviation during the installation process (such as plug tilting or oil passage hole machining error), it is very easy to cause a gap in the line contact sealing surface, resulting in oil leakage from the oil passage hole. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a crosshead pin for a diesel engine, which can solve the problem of poor sealing performance when the lubricating oil sealing plug and the internal oil passage hole of the crosshead pin are sealed together.

[0005] A crosshead pin for a diesel engine according to an embodiment of the present invention includes: a main body and a screw plug. The main body is provided with a plurality of oil passage holes, and a first inclined surface is provided at the port of each oil passage hole. The screw plug includes a sealing head and a threaded section connected in sequence. A second inclined surface is provided on the outer side of the sealing head. The first inclined surface and the second inclined surface have the same inclination angle. The threaded section is disposed in the oil passage hole, and the screw plug is disposed at the port of the oil passage hole to seal the oil passage hole.

[0006] It has at least the following beneficial effects: The main body is provided with several oil passage holes. When the diesel engine is running, its moving parts need lubricating oil for lubrication. The oil passage holes are used to transport the lubricating oil. The screw plug is set at the end of the oil passage hole and is used to seal the oil passage hole. The screw plug includes a sealing head and a threaded section. A first inclined surface is provided at the port of the oil passage hole, and a second inclined surface is provided on the outside of the sealing head. The first inclined surface and the second inclined surface have the same inclination angle. The first inclined surface and the second inclined surface can fit together completely, which solves the problem of poor sealing effect caused by the previous method of sealing only by thread.

[0007] According to some embodiments of the present invention, the inner wall of the port of the oil passage is provided with an internal thread, and the outer side of the threaded segment is provided with an external thread. The internal thread and the external thread cooperate to connect the plug to the port of the oil passage.

[0008] According to some embodiments of the present invention, the inclination angles of the first inclined surface and the second inclined surface are both 30°.

[0009] According to some embodiments of the present invention, the surface roughness Ra of the first inclined surface and the second inclined surface is ≤1.6μm.

[0010] According to some embodiments of the present invention, a driving groove is provided at one end of the sealing head away from the threaded section, and the driving groove is used to transmit torque.

[0011] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the structure of a crosshead pin in a diesel engine according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a crosshead pin in a diesel engine according to an embodiment of the present invention; Figure 3 for Figure 1 The top view shown; Figure 4 for Figure 3 The cross-sectional view of AA is shown; Figure 5 This is a schematic diagram of the structure of the screw plug in the crosshead pin of a diesel engine according to an embodiment of the present invention; Reference numerals: Main body 100, oil passage 110, first inclined surface 111; Plug 200, Sealing head 210, Second inclined surface 211, Threaded section 220, Drive groove 221 Detailed Implementation In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0013] In the description of this utility model, the use of "first" and "second" is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features or the order of the technical features.

[0014] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0015] Reference Figure 1 This utility model discloses a crosshead pin for a diesel engine, comprising: a main body 100 and a plug 200. The main body 100 is provided with a plurality of oil passage holes 110, and a first inclined surface 111 is provided at the port of the oil passage hole 110. When the diesel engine is running, its moving parts need to be lubricated with lubricating oil, and the oil passage hole 110 is used to transport the lubricating oil.

[0016] The screw plug 200 includes a sealing head 210 and a threaded section 220 connected in sequence. A second inclined surface 211 is provided on the outer side of the sealing head 210. The first inclined surface 111 and the second inclined surface 211 have the same inclination angle. The threaded section 220 is disposed inside the oil passage hole 110. The screw plug 200 is disposed at the end of the oil passage hole 110 to seal the oil passage hole 110. The screw plug 200 is disposed at the end of the oil passage hole 110 to seal the oil passage hole 110. The screw plug 200 includes a sealing head 210 and a threaded section 220. A first inclined surface 111 is provided at the end of the oil passage hole 110. The screw plug 200 includes a sealing head 210 and a threaded section 220. A first inclined surface 111 is provided at the end of the oil passage hole 110. A second inclined surface 211 is provided on the outer side of the sealing head 210. The first inclined surface 111 and the second inclined surface 211 have the same inclination angle. The first inclined surface 111 and the second inclined surface 211 can fit together completely, which solves the problem of poor sealing effect caused by the previous method of sealing only by threads.

[0017] Understandably, in the past, when the screw plug 200 sealed the oil passage hole 110, it did so by engaging the threaded section 220 of the screw plug 200 with the threaded part on the inner wall of the oil passage hole 110. The external thread on the threaded section 220 and the thread on the inner wall of the oil passage hole 110 achieved line contact, thereby achieving a sealing effect. However, due to manufacturing and installation errors, the sealing reliability when the external thread on the threaded section 220 engages with the thread on the inner wall of the oil passage hole 110 is insufficient, which can easily lead to the risk of oil leakage. To solve this problem, this application designs a first inclined surface 111 at the end of the oil passage hole 110 and a second inclined surface 211 on the screw plug 200. When the threaded section 220 of the screw plug 200 is connected into the inner wall of the oil passage hole 110, the second inclined surface 211 gradually approaches and abuts against the first inclined surface 111. The first inclined surface 111 and the second inclined surface 211 are used to enhance the sealing effect of the screw plug 200 on the oil passage hole 110.

[0018] It should be noted that the surface contact design of the first inclined surface 111 and the second inclined surface 211 expands the sealing area, reduces the pressure per unit area, and makes the seal more uniform. It can maintain a stable seal even under vibration or temperature change environments, reducing the risk of lubricating oil leakage. The structure of the first inclined surface 111 and the second inclined surface 211 has a self-guiding function, which can automatically correct minor deviations during the screw plug 200 screwing process, reducing the dependence on installation accuracy, simplifying the assembly process, and improving production efficiency. Through effective sealing, lubricating oil leakage is prevented, ensuring sufficient lubrication inside the crosshead pin, reducing wear, thereby extending the service life of key components of the diesel engine and reducing maintenance frequency and costs. This design is suitable for various operating conditions, including high load, high temperature and high vibration environments, improving the overall reliability and safety of the diesel engine.

[0019] According to some embodiments of this utility model, the inner wall of the port of the oil passage 110 is provided with an internal thread, and the outer side of the threaded section 220 is provided with an external thread. The internal thread and the external thread cooperate to connect the plug 200 to the port of the oil passage 110. The plug 200 needs to be fixed at the port position of the oil passage 110. It should be noted that the internal thread provided on the inner wall of the port of the oil passage 110 and the external thread on the outer side of the threaded section 220 can be paired and cooperated. The plug 200 is threadedly connected to the port of the oil passage 110, which facilitates the disassembly and replacement of the plug 200.

[0020] According to some embodiments of this utility model, the inclination angles of the first inclined surface 111 and the second inclined surface 211 are both 30°. This angle setting can reduce the guiding resistance during plug installation while ensuring the sealing area. It should be noted that the inclination angles of the first inclined surface 111 and the second inclined surface 211 are not limited to 30°, and can be adjusted according to actual sealing requirements and space constraints. For example, reducing the angle to 15°-20° can increase the sealing contact area, but may increase the installation resistance; increasing the angle to 40°-45° can reduce the installation torque, which is suitable for space-constrained scenarios. The angle selection should balance the sealing effect and installation convenience.

[0021] According to some embodiments of this utility model, the surface roughness Ra of the first inclined surface 111 and the second inclined surface 211 is ≤1.6μm. Since the first inclined surface 111 and the second inclined surface 211 are made as smooth as possible when they are put together, gaps are avoided when the first inclined surface 111 and the second inclined surface 211 are put together, which would affect the sealing performance. The roughness of the first inclined surface 111 and the roughness of the second inclined surface 211 must be consistent to ensure that there are no gaps when they are put together. In addition to controlling the surface roughness, other surface treatment technologies can also be used to enhance the sealing performance, such as applying a sealing coating and hardening the first inclined surface 111 and the second inclined surface 211.

[0022] It is conceivable that, based on the first inclined surface 111 and the second inclined surface 211, auxiliary sealing elements can be added for auxiliary sealing. For example, an O-ring groove can be added to the port of the sealing head 210 or the oil passage hole 110, and an oil-resistant rubber O-ring can be embedded to achieve double sealing; or copper or aluminum gaskets can be placed between the inclined surfaces to fill the uneven areas through plastic deformation.

[0023] According to some embodiments of this utility model, a drive groove 221 is provided at the end of the sealing head 210 away from the threaded section 220. The drive groove 221 is used to transmit torque. The drive groove 221 is generally set as a "cross", "internal hex" or "slotted" shape. Hand tools (screwdrivers, wrenches, etc.) screw the plug 200 into the oil passage hole 110 or screw the plug 200 out of the oil passage hole through the drive groove 221. The drive groove 221 can also be set as other shapes. The drive groove 221 is a conventional setting and will not be described in detail.

[0024] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0025] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A crosshead pin for a diesel engine, characterized in that, include: The main body (100) is provided with a plurality of oil passage holes (110), and a first inclined surface (111) is provided at the port of the oil passage hole (110). The screw plug (200) includes a sealing head (210) and a threaded section (220) connected in sequence. The outer side of the sealing head (210) is provided with a second inclined surface (211). The first inclined surface (111) and the second inclined surface (211) have the same inclination angle. The threaded section (220) is disposed in the oil passage hole (110) so that the screw plug (200) seals the port of the oil passage hole (110).

2. The crosshead pin for a diesel engine according to claim 1, characterized in that, The inner wall of the port of the oil passage (110) is provided with an internal thread, and the outer side of the threaded section (220) is provided with an external thread. The internal thread and the external thread cooperate to connect the plug (200) to the port of the oil passage (110).

3. The crosshead pin for a diesel engine according to claim 1, characterized in that, The inclination angles of the first inclined surface (111) and the second inclined surface (211) are both 30°.

4. The crosshead pin for a diesel engine according to claim 1, characterized in that, The surface roughness Ra of the first inclined surface (111) and the second inclined surface (211) is ≤1.6μm.

5. A crosshead pin for a diesel engine according to claim 1, characterized in that, The sealing head (210) has a drive groove (221) at one end away from the threaded section (220), and the drive groove (221) is used to cooperate with the tool to transmit torque.

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