Lubricating oil sealing device for crankshaft output end of diesel engine

Abstract

The utility model discloses a lubricating oil sealing device for a crankshaft output end of a diesel engine. The lubricating oil sealing device comprises a shell, a circular groove is formed in one side of the shell, an oil flinger is inserted into the circular groove, a plurality of circular teeth are annularly, evenly and fixedly connected to the periphery of the oil flinger, a plurality of open grooves are annularly and evenly formed in one side of the oil flinger, and flow guide edges are fixedly connected to the middles of the open grooves. The end, close to the periphery of the oil flinger, of each groove is thick, and the section of each flow guide edge is triangular. The circular teeth enable kinetic energy of lubricating oil to be converted into heat energy, most leaked energy is consumed, the open grooves and the flow guide edges utilize centrifugal force and improve the rotational flow strength, the leakage amount is further reduced, residual energy is eliminated through static sealing and dynamic compensation of the connecting ring, the limiting ring and the sealing ring, zero leakage is achieved, and through cooperation of components, the sealing performance is improved. A three-level sealing barrier is achieved, the sealing performance of the device is remarkably improved, the service life of the device is prolonged, and the maintenance cost is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of lubricating oil sealing devices, and in particular to a lubricating oil sealing device for the output end of a diesel engine crankshaft. Background Technology

[0002] A diesel engine is a compression-ignition internal combustion engine that uses diesel fuel. It converts chemical energy into mechanical energy by compressing air to generate high temperatures that cause the diesel fuel to ignite. The oil seal device at the crankshaft output end of a diesel engine is an integrated mechanical component. Its core function is to prevent oil leakage from the crankcase to the external environment under high speed, high temperature, and pressure fluctuations, while also preventing external impurities from entering the lubrication system.

[0003] In this regard, Chinese utility model patent with authorization announcement number CN220646053U discloses a lubricating oil sealing device for the output end of a diesel engine crankshaft, including a crankshaft, a flange fixed to the output end of the crankshaft, a labyrinth-type oil seal cover with an opening facing the crankshaft fixed on the outer circumferential wall of the flange, and an oil slinger plate located inside the labyrinth-type oil seal cover fixed on the flange surface facing the crankshaft. The oil slinger plate, which generates an airflow pressure difference from the outside to the inside of the engine by rotation, collects the oil mist and throws it onto the inner wall of the engine body, where it falls into the oil pan for collection.

[0004] However, current oil sealing devices for the crankshaft output end of diesel engines have the following drawbacks: they typically use a single structure to consume the energy of the fluid, the leakage energy cannot be completely eliminated, there is a risk of fluid leakage, the sealing performance of the device is reduced, and the maintenance cost is increased.

[0005] Therefore, we propose a lubricating oil sealing device for the output end of a diesel engine crankshaft to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to provide a lubricating oil sealing device for the output end of a diesel engine crankshaft, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a lubricating oil sealing device for the output end of a diesel engine crankshaft, comprising a housing, a circular groove on one side of the housing, an oil slinger inserted inside the circular groove, a plurality of circular teeth uniformly and fixedly connected to the outer periphery of the oil slinger in an annular shape, a plurality of slots uniformly and annularly opened on one side of the oil slinger, and a guide rib fixedly connected to the middle of the slot.

[0008] Preferably, the slot is an inclined arc surface, the slot is thicker at one end near the outer circumference of the oil slinger, and the guide ridge has a triangular cross-section.

[0009] Preferably, a circular hole is provided through the center of the circular groove, a sealing ring is fixedly connected inside the circular hole, a connecting ring is movably connected to the inner wall of the sealing ring, a limit ring is fixedly connected to one side of the connecting ring, the limit ring is in contact with the side wall of the oil slinger, and the sealing ring, connecting ring and limit ring are all elastic.

[0010] Preferably, a connecting strip is fixedly connected to the top of the limiting ring, an insertion hole is provided on one side of the top of the oil slinger, a snap-fit ​​bracket is provided on the top of the housing, the snap-fit ​​bracket is elastic, and a cylindrical rod is fixedly connected to one side of the inner wall of the snap-fit ​​bracket. The cylindrical rod passes through the connecting strip and is inserted into the insertion hole.

[0011] Preferably, a connecting groove is provided on one side of the housing, and the connecting groove communicates with the circular groove.

[0012] Preferably, three mounting holes are provided on both sides of the housing.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. In this utility model, the circular teeth convert the kinetic energy of the lubricating oil into heat energy, consuming most of the leakage energy. The slots and guide ridges utilize centrifugal force and increase the swirling intensity to further reduce the leakage. Then, through the static sealing and dynamic compensation of the connecting ring, limit ring and sealing ring, the remaining energy is eliminated, achieving zero leakage. Through the cooperation of the components, a three-level sealing barrier is achieved, which significantly improves the sealing performance of the device, extends the service life of the equipment, and reduces maintenance costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is an exploded view of the present invention.

[0017] Figure 3 This utility model Figure 2 Enlarged diagram of point A in the middle.

[0018] In the diagram: 1. Housing; 11. Circular groove; 12. Connecting groove; 13. Mounting hole; 14. Circular hole;

[0019] 2. Oil slinger; 21. Gear; 22. Groove; 23. Guide rib; 24. Insertion hole;

[0020] 3. Sealing ring;

[0021] 4. Connecting ring; 41. Limiting ring; 42. Connecting strip;

[0022] 5. Snap-fit ​​bracket; 51. Cylindrical rod. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1:

[0025] Please see Figure 1-3 This utility model provides a technical solution: a lubricating oil sealing device for the output end of a diesel engine crankshaft, including a housing 1. A circular groove 11 is opened on one side of the housing 1, and an oil slinger 2 is inserted into the circular groove 11. Multiple circular teeth 21 are uniformly fixedly connected to the outer periphery of the oil slinger 2 in an annular shape. Multiple slots 22 are uniformly opened on one side of the oil slinger 2 in an annular shape, and a guide rib 23 is fixedly connected in the middle of the slot 22. The adjacent circular teeth 21 improve the efficiency of converting the kinetic energy of the lubricating oil into heat energy (the circular teeth 21 break the lubricating oil into droplets, and the thin liquid film formed on the surface of the circular teeth 21 increases the heat dissipation coefficient, avoids lubricating oil failure due to the decrease in viscosity at high temperature, and reduces the thermal efficiency decay caused by poor heat dissipation), destroys the fluid boundary layer, promotes turbulence formation, reduces the residence time of the lubricating oil, and reduces leakage. The slots 22 increase the lubricating oil return speed, and the setting of the guide rib 23 enhances the swirling speed. Through the synergistic effect of fluid dynamics optimization and energy dissipation mechanism, the sealing performance is further improved.

[0026] Example 2:

[0027] Please see Figure 1-3 This is the second embodiment of the present invention. This embodiment is based on the previous embodiment. The slot 22 is an inclined arc surface. The outer edge of the slot 22 is thicker near the oil slinger 2. The cross-section of the guide rib 23 is triangular. The slot 22 is set to form a "low-high" pressure gradient by using centrifugal force, which increases the return speed of the lubricating oil. The triangular cross-sectional shape of the guide rib 23 can improve the swirling intensity.

[0028] A circular hole 14 is provided through the center of the circular groove 11. A sealing ring 3 is fixedly connected inside the circular hole 14. A connecting ring 4 is movably connected to the inner wall of the sealing ring 3. A limit ring 41 is fixedly connected to one side of the connecting ring 4. The limit ring 41 contacts the inner wall of the oil slinger 2. The sealing ring 3, the connecting ring 4, and the limit ring 41 are all elastic. The elastic deformation of the limit ring 41, the connecting ring 4, and the sealing ring 3 compensates for the thermal expansion of the crankshaft, so that the gap change can be completely absorbed. After the residual lubricating oil comes into contact with the limit ring 41, the connecting ring 4, and the sealing ring 3, zero leakage is achieved through static sealing and dynamic compensation.

[0029] A connecting strip 42 is fixedly connected to the top of the limiting ring 41. An insertion hole 24 is opened on one side of the top of the oil slinger 2. A snap-fit ​​bracket 5 is provided on the top of the housing 1. The snap-fit ​​bracket 5 is elastic. A cylindrical rod 51 is fixedly connected to one side of the inner wall of the snap-fit ​​bracket 5. The cylindrical rod 51 passes through the connecting strip 42 and is inserted into the insertion hole 24. The snap-fit ​​bracket 5 and the cylindrical rod 51 can fix the oil slinger 2, the connecting ring 4 and the limiting ring 41 to the housing 1. When in use, the snap-fit ​​bracket 5 and the cylindrical rod 51 can be removed for use.

[0030] A connecting groove 12 is provided on one side of the housing 1, and the connecting groove 12 is connected to the circular groove 11; after the lubricating oil enters the circular groove 11, it flows into the oil storage structure from the connecting groove 12 to realize the recovery of the lubricating oil.

[0031] The housing 1 has three through holes 13 on both sides; the housing 1 can be installed at the place of use by using bolts through the mounting holes 13.

[0032] Example 3:

[0033] Please see Figure 1-3This is the third embodiment of the present invention. This embodiment is based on the above two embodiments. If the sealing device is required, the entire device is taken to the place of use, and the snap-fit ​​bracket 5 and cylindrical rod 51 fix the device. When the sealing device needs to be installed at the crankshaft output or other positions, the snap-fit ​​bracket 5 and cylindrical rod 51 are removed from the housing 1, and then the housing 1 is installed. The housing 1 is installed to the place of use by bolts passing through the mounting holes 13, and then the housing 1 is further fixed by other components. During the use of the sealing device, after the lubricating oil at the output end enters the circular groove 11, the adjacent circular teeth 21 improve the efficiency of converting the kinetic energy of the lubricating oil into heat energy, destroy the lubricating oil boundary layer, promote turbulence formation, reduce the residence time of the lubricating oil, and thus reduce leakage. The slot 22 uses centrifugal force to form a "low-high" pressure gradient, which increases the lubricating oil return speed. The triangular cross-sectional shape of the guide rib 23 can enhance the swirling intensity. The swirling enhancement design of the guide rib 23 achieves further improvement in sealing performance through the synergistic effect of fluid dynamics optimization and energy dissipation mechanism. The elastic deformation of the limiting ring 41, connecting ring 4, and sealing ring 3 compensates for the thermal expansion of the crankshaft, allowing the clearance change to be completely absorbed. After the residual lubricating oil comes into contact with the limiting ring 41, connecting ring 4, and sealing ring 3, the residual energy is eliminated through static sealing and dynamic compensation, achieving zero leakage. After the lubricating oil enters the circular groove 11, it flows into the oil storage structure from the connecting groove 12, realizing the recovery of lubricating oil. In this utility model, the circular teeth 21 convert the kinetic energy of the lubricating oil into heat energy, consuming most of the leakage energy. The slot 22 and the guide ridge 23 utilize centrifugal force and increase the swirling intensity to further reduce the leakage. Then, through the static sealing and dynamic compensation of the connecting ring 4, limiting ring 41, and sealing ring 3, the residual energy is eliminated, achieving zero leakage. Through the cooperation of the components, a three-level sealing barrier is achieved, significantly improving the sealing performance of the device, extending the service life of the equipment, and reducing maintenance costs.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lubricating oil seal device for the output end of a diesel engine crankshaft, comprising a housing (1), characterized in that: The shell (1) is provided with a circular groove (11) on one side, the circular groove (11) is inserted with an oil throwing disc (2), the outer periphery of the oil throwing disc (2) is uniformly and fixedly connected with a plurality of circular teeth (21), a plurality of grooves (22) are uniformly and annularly provided on one side of the oil throwing disc (2), and the middle of the groove (22) is fixedly connected with a flow guide rib (23).

2. A lubricating oil seal for the output end of a diesel engine crankshaft as defined in claim 1, characterized in that: The groove (22) is an inclined arc surface, the groove (22) is thick near one end of the outer periphery of the oil throwing disc (2), and the cross section of the flow guide rib (23) is triangular.

3. A lubricating oil seal for the output end of a diesel engine crankshaft as defined in claim 1, wherein: The circular groove (11) is provided with a circular hole (14) through the middle, the circular hole (14) is fixedly connected with a sealing ring (3) inside, the inner wall of the sealing ring (3) is movably connected with a connecting ring (4), one side of the connecting ring (4) is fixedly connected with a limiting ring (41), the limiting ring (41) is in contact with the side wall of the oil throwing disc (2), and the sealing ring (3), the connecting ring (4) and the limiting ring (41) are all elastic.

4. A lubricating oil seal for the output end of a diesel engine crankshaft as defined in claim 3 wherein: The limiting ring (41) is fixedly connected with a connecting strip (42) on the top, the oil throwing disc (2) is provided with a bushing (24) on one side of the top, the shell (1) is provided with a clamping frame (5) on the top, the clamping frame (5) is elastic, one side of the inner wall of the clamping frame (5) is fixedly connected with a cylindrical rod (51), the cylindrical rod (51) passes through the connecting strip (42) and is inserted into the bushing (24) inside.

5. The oil seal for the output end of a diesel engine crankshaft as set forth in claim 1, characterized in that: The shell (1) is provided with a connecting groove (12) on one side, and the connecting groove (12) is communicated with the circular groove (11).

6. A lubricating oil seal for the output end of a diesel engine crankshaft as defined in claim 1, wherein: The shell (1) is provided with three mounting holes (13) through the two sides.

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