A lubricated crankshaft structure

Abstract

The application discloses a lubricating crankshaft structure, which is used for quickly lubricating a crankshaft, reducing the wear rate of the crankshaft and prolonging the service life of an engine. The application comprises a thrust bearing cover, an upper thrust bearing bush and a lower thrust bearing bush; the thrust bearing cover is connected with the lower thrust bearing bush; the upper thrust bearing bush is connected with the lower thrust bearing bush in a central symmetry mode; the thrust bearing cover is provided with an inclined oil hole which is used for transmitting engine oil; a first oil hole is arranged on the inner arc surface of the lower thrust bearing bush; a second oil hole is arranged on the thrust surface of the lower thrust bearing bush; the oil transmission hole on the inner arc surface of the upper thrust bearing bush is communicated with the main oil passage of the engine; the two ends of the inclined oil hole are communicated with the first oil hole and the second oil hole; wedge-shaped oil grooves are arranged on the thrust surfaces of the upper thrust bearing bush and the lower thrust bearing bush, the wedge-shaped oil grooves comprise single wedge-shaped oil grooves and double-edge wedge-shaped oil grooves, and the wedge-shaped oil grooves are used for forming a wedge effect to quickly lubricate the thrust surfaces.

Description

Technical Field

[0001] This application relates to the field of engine technology, and more particularly to a lubricated crankshaft structure. Background Technology

[0002] As the heart of mechanical equipment, the engine is a key component that converts the thermal energy of fuel into mechanical energy, driving automobiles, ships, airplanes, and various industrial equipment. It supports the normal operation of multiple fields such as transportation, manufacturing, and agricultural operations, and plays a vital role in promoting social and economic development and improving people's living standards.

[0003] When an engine is running, in addition to its rotational motion, the crankshaft also generates axial force, which may cause abnormal movement of the connecting rods, thus affecting the normal operation of the engine. To maintain the normal operation of the crankshaft, thrust washers are usually used to fill the gaps and limit the axial movement of the crankshaft. At the same time, when engine oil circulates inside the engine, it lubricates the components by splashing, and the oil film formed can reduce friction. The thrust washers also help maintain the stability of the oil film, thereby reducing the frictional wear of the crankshaft.

[0004] However, when the engine is frequently started and stopped and the clutch is disengaged for a long time, the thrust will act on the crankshaft for an extended period of time. Splash lubrication combined with traditional thrust washers cannot quickly establish an oil film, which may lead to increased crankshaft wear and reduced engine life. Summary of the Invention

[0005] This application provides a crankshaft lubrication structure for rapid crankshaft lubrication, reducing crankshaft wear rate and improving engine service life.

[0006] This application provides a lubricated crankshaft structure, comprising: a thrust bearing cap, an upper thrust bearing shell, and a lower thrust bearing shell;

[0007] The thrust bearing cap is connected to the lower thrust bearing bush;

[0008] The upper thrust bearing and the lower thrust bearing are centrally symmetrically connected.

[0009] The thrust bearing cover is provided with an inclined oil hole, which is used to transfer engine oil.

[0010] The lower thrust bearing has a first oil hole on its inner arc surface;

[0011] A second oil hole is provided on the thrust surface of the lower thrust bearing;

[0012] The oil supply hole on the inner arc surface of the upper thrust bearing is connected to the main oil passage of the engine.

[0013] The two ends of the inclined oil hole are connected to the first oil hole and the second oil hole;

[0014] The upper thrust bearing and the lower thrust bearing are provided with wedge-shaped oil grooves on their thrust surfaces. The wedge-shaped oil grooves include single wedge-shaped oil grooves and double wedge-shaped oil grooves. The wedge-shaped oil grooves are used to form a wedge effect for rapid lubrication of the thrust surface.

[0015] Optionally, the upper thrust bearing includes an upper bearing shell and an upper thrust plate;

[0016] The lower thrust bearing includes a lower bearing shell and a lower thrust plate;

[0017] The upper bearing and the lower bearing are provided with fixing grooves on both sides of their side walls;

[0018] The inner arc surfaces of the upper thrust plate and the lower thrust plate are provided with protrusions;

[0019] The protrusion of the upper thrust plate is interference-fitted with the fixing groove of the upper bearing bush;

[0020] The protrusion of the lower thrust plate is interference-fitted with the fixing groove of the lower bearing.

[0021] Optionally, the thrust surface of the upper thrust plate is provided with the double-sided wedge-shaped oil groove;

[0022] The thrust surface of the lower thrust plate is provided with the single wedge-shaped oil groove and the double wedge-shaped oil groove.

[0023] Optionally, the lower thrust plate is provided with a second oil hole in the single wedge-shaped oil groove.

[0024] Optionally, oil grooves are provided on the inner arc surfaces of the upper bearing and the lower bearing.

[0025] Optionally, the lower bearing bush is provided with the first oil hole in the oil groove;

[0026] The upper bearing bush is provided with an oil supply hole in the oil groove.

[0027] Optionally, the thrust bearing cover is provided with a thrust groove, which is used to fix the lower thrust plate.

[0028] Optionally, a positioning lip is provided on the outer arc surface of the upper bearing and the lower bearing, the positioning lip being used for axial positioning of the upper bearing and the lower bearing.

[0029] Optionally, bearing bushes are provided on the inner arc surfaces of the upper and lower bearing bushes, the bearing bushes being used to reduce wear between the upper and lower bearing bushes and the crankshaft journal.

[0030] Optionally, the oil groove can be oriented along the axial direction, around the circumference, obliquely, or spirally.

[0031] As can be seen from the above technical solutions, this application has the following advantages:

[0032] The oil inlet on the inner arc surface of the upper thrust bearing connects to the engine's main oil passage. An oblique oil hole is provided on the thrust bearing cap, connecting to the first oil hole on the inner arc surface of the lower thrust bearing and the second oil hole on the thrust surface, ensuring a rapid and sufficient supply of oil to the thrust surface and crankshaft journal. The single-wedge oil groove and double-wedge oil groove on the upper and lower thrust bearings effectively store oil. During crankshaft operation, the single-wedge and double-wedge oil grooves generate a wedge effect, causing the oil to distribute evenly across the thrust surface and quickly form an oil film, thereby reducing wear and extending engine life. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 A schematic diagram of an embodiment of the lubrication crankshaft structure provided in this application;

[0035] Figure 2 A schematic diagram of an embodiment of the thrust bearing cap in the lubricated crankshaft structure provided in this application;

[0036] Figure 3 This is a schematic diagram of another embodiment of the lubricated crankshaft structure provided in this application. Detailed Implementation

[0037] This application provides a crankshaft lubrication structure for rapid crankshaft lubrication, reducing crankshaft wear rate and improving engine service life.

[0038] In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and other terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to describe the relative positional relationship between the components or parts and do not specifically limit the specific installation orientation of each component or part.

[0039] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0040] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0041] Furthermore, the structures, proportions, sizes, etc., drawn in the accompanying drawings of this application are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modification to the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects and purposes that this application can produce, should still fall within the scope of the technical content disclosed in this application.

[0042] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] Please see Figure 1 and Figure 2 One embodiment of the lubricated crankshaft structure in this application includes: a thrust bearing cover 1, an upper thrust bearing shell 2, and a lower thrust bearing shell 3;

[0044] The thrust bearing cap 1 is connected to the lower thrust bearing bush 3;

[0045] The upper thrust bearing 2 and the lower thrust bearing 3 are centrally symmetrically connected;

[0046] The thrust bearing cap 1 is provided with an inclined oil hole 4, which is used to transfer engine oil.

[0047] A first oil hole 5 is provided on the inner arc surface of the lower thrust bearing 3;

[0048] A second oil hole 6 is provided on the thrust surface of the lower thrust bearing 3;

[0049] The oil supply hole on the inner arc surface of the upper thrust bearing 2 is connected to the main oil passage of the engine;

[0050] The two ends of the inclined oil hole 4 are connected to the first oil hole 5 and the second oil hole 6;

[0051] The upper thrust bearing 2 and the lower thrust bearing 3 are provided with wedge-shaped oil grooves on their thrust surfaces. The wedge-shaped oil grooves include a single wedge-shaped oil groove 7 and a double wedge-shaped oil groove 8. The wedge-shaped oil grooves are used to form a wedge effect for rapid lubrication of the thrust surface.

[0052] Thrust bearing cap 1: Supports and fixes the lower thrust bearing shell 3.

[0053] Upper thrust bearing 2 and lower thrust bearing 3: The upper thrust bearing 2 and the lower thrust bearing 3 cooperate with each other to prevent the crankshaft from moving in the axial direction, and at the same time generate an oil film to reduce crankshaft wear.

[0054] The crankshaft is a core component of an engine, responsible for converting the linear motion of the piston into rotational motion. During engine operation, the connecting rods move up and down at high speed, generating force which is applied to the crankshaft, causing it to rotate. To ensure stable crankshaft operation, it needs to be fixed and supported. The crankshaft also experiences friction with surrounding components, accelerating wear. This can reduce engine efficiency and, in severe cases, lead to crankshaft breakage, affecting engine lifespan. To reduce crankshaft wear, integral thrust bushings or split thrust bearings are typically used to fix and support the crankshaft journals. Engine oil is injected into the thrust bushings or thrust bearings, and with the crankshaft's rotation, an oil film forms between the thrust bushings or thrust bearings and the crankshaft, thereby reducing crankshaft wear.

[0055] In this embodiment, a split thrust bearing structure is used, which can be flexibly adjusted according to the actual working conditions. The inner arc surface of the thrust bearing cap 1 is connected to the outer arc surface of the lower thrust bearing 3. The upper thrust bearing 2 and the lower thrust bearing 3 are centrally symmetrically connected, and the crankshaft journal is installed between the upper thrust bearing 2 and the lower thrust bearing 3. The thrust bearing cap 1, the upper thrust bearing 2, and the lower thrust bearing 3 cooperate to provide necessary support for the crankshaft, restrict the crankshaft's movement in the axial direction, and enable the crankshaft to rotate along a predetermined trajectory. The structure composed of the thrust bearing cap 1, the upper thrust bearing 2, and the lower thrust bearing 3 enables precise matching between components, prevents vibration and noise caused by axial movement of the crankshaft, reduces energy loss, and improves the engine's operating efficiency and smoothness. Meanwhile, the upper thrust bearing 2 has an oil supply hole that connects to the main oil passage of the engine. The inner arc surface of the thrust bearing cover 1 has an inclined oil hole 4. The two ends of the inclined oil hole 4 connect the first oil hole 5 on the inner arc surface of the lower thrust bearing 3 and the second oil hole 6 on the thrust surface of the lower thrust bearing 3. The thrust surfaces of the upper thrust bearing 2 and the lower thrust bearing 3 have wedge-shaped oil grooves, including single wedge-shaped oil grooves and double wedge-shaped oil grooves. When the engine is running, the engine oil in the main oil passage lubricates the crankshaft journal through the oil inlet on the upper thrust bearing 2. Simultaneously, the engine oil on the inner arc surfaces of the upper thrust bearing 2 and lower thrust bearing 3 flows sequentially through the first oil hole 5 on the lower thrust bearing 3, the oblique oil hole 4 on the thrust bearing cap 1, and the second oil hole 6 on the lower thrust bearing 3 into the single wedge-shaped oil groove on the thrust surface. The crankshaft rotation drives the engine oil into the double wedge-shaped oil grooves on the upper and lower thrust bearings 2 and 3, creating a wedge effect that pushes the engine oil back against the crankshaft, quickly forming an oil film and reducing wear. The single wedge-shaped oil groove 7 and the double wedge-shaped oil groove 8 on the thrust surface effectively store engine oil, reducing oil loss and maintaining lubrication.

[0056] In this embodiment, the oil supply hole on the inner arc surface of the upper thrust bearing 2 is connected to the main oil passage of the engine. An inclined oil hole 4 is provided on the upper thrust bearing cover 1, which connects to the first oil hole 5 on the inner arc surface of the lower thrust bearing 3 and the second oil hole 6 on the thrust surface, transmitting engine oil to the crankshaft journal and the thrust surface, thus quickly providing sufficient engine oil to the thrust surface and crankshaft journal. The single wedge-shaped oil groove 7 and the double wedge-shaped oil groove 8 on the upper thrust bearing 2 and the lower thrust bearing 3 can effectively store engine oil. When the crankshaft is running, the single wedge-shaped oil groove 7 and the double wedge-shaped oil groove 8 will generate a wedge effect, causing the engine oil to be evenly distributed on the thrust surface, quickly forming an oil film, thereby reducing the wear rate and improving the engine's service life.

[0057] Please see Figure 3 In one optional embodiment, the upper thrust bearing 2 includes an upper bearing 21 and an upper thrust plate 22;

[0058] The lower thrust bearing 3 includes a lower bearing 31 and a lower thrust plate 32;

[0059] The upper bearing 21 and the lower bearing 31 are provided with fixing grooves 9 on both sides of their side walls;

[0060] The inner arc surfaces of the upper thrust plate 22 and the lower thrust plate 32 are provided with protrusions 10;

[0061] The protrusion 10 of the upper thrust plate 22 is interference-fitted with the fixing groove 9 of the upper bearing 21;

[0062] The protrusion 10 of the lower thrust plate 32 is interference-fitted with the fixing groove 9 of the lower bearing 31.

[0063] Upper thrust bearing 21 and lower thrust bearing 31: The upper thrust bearing 2 and lower thrust bearing 3 are components used to support and lubricate the crankshaft. They are semi-circular metal structures, and in special cases, wood, engineering plastics or rubber materials can be used.

[0064] Lower thrust plate 32 and upper thrust plate 22: respectively installed on the side walls of upper bearing 21 and lower bearing 31, are auxiliary components that enhance the stability of upper bearing 21 and lower bearing 31, lubricate the thrust surfaces and distribute crankshaft load.

[0065] Traditional crankshaft lubrication systems employ separate assembly of thrust bearings and thrust washers. While this allows for adjustment of the thrust bearings and washers according to actual operating conditions, the continuous high-speed operation of the connecting rods drives the crankshaft, generating significant rotational forces. Due to these forces, the separately assembled thrust washers are prone to detachment, leading to engine malfunctions. Furthermore, the separate assembly also increases the risk of missing thrust washers, resulting in decreased precision in component fit and insufficient lubrication.

[0066] In this embodiment, the upper thrust bearing 2 is composed of an upper bearing 21 and an upper thrust plate 22, and the lower thrust bearing 3 is composed of a lower bearing 31 and a lower thrust plate 32. The upper bearing 21 and the lower bearing 31 have fixing grooves 9 on their side walls. The inner arc surfaces of the upper thrust plate 22 and the lower thrust plate 32 have protrusions 10 that are interference-fitted with the fixing grooves 9 of the upper bearing 21 and the lower bearing 31, respectively, forming an integral structure between the upper bearing 21 and the upper thrust plate 22, and an integral structure between the lower bearing 31 and the lower thrust plate 32. Multiple fixing grooves 9 and protrusions 10 can be used. The design of the fixing grooves 9 and protrusions 10 ensures that the thrust plate and the bearing form an integral structure, guaranteeing the flexible use of the thrust plate and the bearing while reducing the problem of missing or detached thrust plates, improving the assembly efficiency of the thrust plate and the bearing, and reducing the misassembly rate.

[0067] Please see Figure 1 and Figure 3 In an optional embodiment, the thrust surface of the upper thrust plate 22 is provided with a double-sided wedge-shaped oil groove 8;

[0068] The thrust surface of the lower thrust plate 32 is provided with a single wedge-shaped oil groove 7 and a double wedge-shaped oil groove 8;

[0069] A second oil hole 5 is provided in the single wedge-shaped oil groove 7 of the lower thrust plate 32.

[0070] In this embodiment, the second oil hole 6 is combined with the single wedge-shaped oil groove 7. Engine oil flows through the second oil hole 6 into the single wedge-shaped oil groove 7 on the thrust surface of the lower thrust plate 32. The single wedge-shaped oil groove 7 can store engine oil, reducing oil loss from the thrust surface. Both the upper thrust plate 22 and the lower thrust plate 32 have double-sided wedge-shaped oil grooves 8 on their thrust surfaces to increase oil storage capacity and maintain lubrication. Multiple second oil holes 5, single wedge-shaped oil grooves 7, and double-sided wedge-shaped oil grooves 8 can be provided. When the crankshaft rotates, the engine oil in the single wedge-shaped oil groove 7 is evenly distributed on the thrust surface, while the double-sided wedge-shaped oil grooves 8 continue to store engine oil, strengthening the wedge effect and enabling the oil film to form quickly and be maintained for a long time to cope with frequent engine starts and stops and reduce crankshaft wear.

[0071] Please see Figure 1 and Figure 3 In one optional embodiment, oil grooves 11 are provided on the inner arc surfaces of the upper bearing shell 21 and the lower bearing shell 31. The oil grooves 11 can be axial, circumferential, oblique, or spiral.

[0072] In this embodiment, oil grooves 11 are formed on the inner arc surfaces of the upper bearing shell 21 and the lower bearing shell 31. The edges of the oil grooves 11 are smooth to ensure that the oil can be smoothly introduced into the lubricated surface. To avoid reducing the load-bearing capacity of the thrust bearing, the oil grooves 11 are usually formed in the non-load-bearing area. The direction of the oil grooves 11 can be axial, circumferential, oblique, or spiral, etc., to adapt to different lubrication requirements. For axial oil grooves, the axial oil grooves of split thrust bearings are usually formed at the split surface of the thrust bearing to reduce the loss of oil flowing out of the split surface too early. In addition, the axial oil grooves are generally not made into axial through grooves to prevent the oil from flowing out of the sealing surface from both ends of the thrust bearing. For circumferential oil grooves, only half a circle is formed and does not extend into the load-bearing area. If unidirectional oil flow is required, spiral oil grooves can be formed. The oil grooves 11 on the inner arc surfaces of the upper bearing 21 and the lower bearing 31 reduce the loss of oil flowing out of the split surface too early, and at the same time guide the oil to lubricate the crankshaft journal, thereby improving the lubrication capacity.

[0073] Please see Figure 1 , Figure 2 as well as Figure 3 In an optional embodiment, a first oil hole 5 is provided in the oil groove 11 of the lower bearing 31;

[0074] An oil supply hole is provided in the oil groove 11 of the upper bearing 21.

[0075] In this embodiment, the oil supply hole is connected to the main oil passage. The engine oil flows out of the oil supply hole from the main oil passage and enters the oil groove 11 of the upper bearing 21 to lubricate the crankshaft journal. The oil groove 11 of the upper bearing 21 is connected to the oil groove 11 of the lower bearing 31. The engine oil is guided into the first oil hole 5 of the lower bearing 31 through the oil groove 11. Since the first oil hole 5 is connected to the inclined oil hole 4, the engine oil will flow out of the second oil hole 6 through the inclined oil hole 4 and reach the thrust surface, so as to provide sufficient engine oil to the thrust surface and improve the lubrication efficiency.

[0076] Please see Figure 2 and Figure 3 In one optional embodiment, the thrust bearing cover 1 is provided with a thrust groove 12, which is used to fix the lower thrust plate 32.

[0077] Thrust groove 12: It is a semi-circular annular groove on both sides of the thrust bearing cover 1, which is adapted to the lower thrust plate 32 and is used to limit the position of the lower thrust plate 32.

[0078] Relative movement between the thrust bearing bush and the thrust bearing cap is not permitted. During crankshaft operation, the rotational force and axial load of the crankshaft transmit frictional force to the surface of the thrust bearing bush through the oil film, causing the thrust bearing bush to tend to move axially or circumferentially. To prevent this movement, the thrust bearing bush must be positioned correctly. Furthermore, proper assembly of the thrust bearing bush is crucial. Improper assembly can lead to bearing seizure, where the high temperature generated by friction between the thrust bearing bush and the crankshaft causes them to melt, resulting in a tight seal that cannot be separated. Therefore, the design of the thrust bearing bush and thrust bearing cap must ensure proper assembly and adequate lubrication to effectively prevent bearing seizure.

[0079] In this embodiment, a semi-circular thrust groove 12 is provided on the thrust bearing cover 1, which is adapted to the shape of the lower thrust plate 32. When the lower thrust bearing bush 3 is installed into the thrust bearing sleeve 1, the lower thrust plate 32 needs to be inserted into the thrust groove 12. The thrust groove 12 can restrict the assembly position of the lower thrust plate 32, reduce the misassembly rate, and fix the lower thrust plate 32, reducing the relative movement between the lower thrust bearing bush 3 and the thrust bearing sleeve 1, thereby improving stability.

[0080] Please see Figure 3 In one optional embodiment, a positioning lip 13 is provided on the outer arc surface of the upper bearing shell 21 and the lower bearing shell 31, and the positioning lip 13 is used to axially position the upper bearing shell 21 and the lower bearing shell 31.

[0081] In this embodiment, a protrusion is provided on the outer arc surface of the upper bearing shell 21 and the lower bearing shell 31 as a positioning lip 13, corresponding to the groove on the inner arc surface of the thrust bearing sleeve 1. Normally, the upper bearing shell 21 is mounted on the thrust bearing seat, and the positioning lip 13 of the upper bearing shell 21 corresponds to the groove on the thrust bearing seat. When assembling the upper bearing shell 21 and the lower bearing shell 31, the positioning lips 13 of the upper bearing shell 21 and the lower bearing shell 31 are aligned and embedded into the groove on the thrust bearing sleeve 1, achieving positioning of the upper bearing shell 21 and the lower bearing shell 31 on the thrust bearing sleeve 1, reducing the misassembly rate, and increasing the stability of the crankshaft lubrication structure.

[0082] In an optional embodiment, bearing bushes are provided on the inner arc surfaces of the upper bearing bush 21 and the lower bearing bush 31, the bearing bushes being used to reduce wear between the upper bearing bush 21 and the lower bearing bush 31 and the crankshaft journal.

[0083] Thrust bearings are typically made of hard materials and distribute the load and provide support for the crankshaft. As the crankshaft rotates, the thrust bearing and crankshaft journal are in a state of friction. Prolonged friction causes wear debris to accumulate between the thrust bearing and the crankshaft journal, or between other components and the crankshaft. Because thrust bearings are made of hard materials, even a small amount of wear debris can cause crankshaft wear.

[0084] In this embodiment, bearing bushes are provided on the inner arc surfaces of the upper bearing shell 21 and the lower bearing shell 31. The bearing bushes contact the crankshaft and are made of a softer metal than the upper bearing shell 21 and the lower bearing shell 31. They are typically made of wear-resistant materials such as bronze and aluminum alloys. The bearing bushes have a lower surface roughness and are more self-lubricating, which can improve lubrication efficiency. Even if the bearing bushes generate wear debris, the debris is relatively soft, which can reduce wear on the crankshaft. In addition, the inner arc surfaces of the upper bearing shell 21 and the lower bearing shell 31 usually have tenons, grooves, or threads. The bearing bushes are embedded into the inner arc surfaces of the upper bearing shell 21 and the lower bearing shell 31 through the tenons, grooves, or threads, increasing the fit between the upper bearing shell 21 and the lower bearing shell 31 and the bearing bushes.

[0085] It should be noted that the above description of the disclosed embodiments enables those skilled in the art to implement or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A lubricated crankshaft structure, characterized in that, include: Thrust bearing cap, upper thrust bearing shell, and lower thrust bearing shell; The thrust bearing cap is connected to the lower thrust bearing bush; The upper thrust bearing and the lower thrust bearing are centrally symmetrically connected. The thrust bearing cover is provided with an inclined oil hole, which is used to transfer engine oil. The lower thrust bearing has a first oil hole on its inner arc surface; A second oil hole is provided on the thrust surface of the lower thrust bearing; The oil supply hole on the inner arc surface of the upper thrust bearing is connected to the main oil passage of the engine. The two ends of the inclined oil hole are connected to the first oil hole and the second oil hole; The upper thrust bearing and the lower thrust bearing are provided with wedge-shaped oil grooves on their thrust surfaces. The wedge-shaped oil grooves include single wedge-shaped oil grooves and double wedge-shaped oil grooves. The wedge-shaped oil grooves are used to form a wedge effect for rapid lubrication of the thrust surface.

2. The lubricated crankshaft structure according to claim 1, characterized in that, The upper thrust bearing includes an upper bearing shell and an upper thrust plate; The lower thrust bearing includes a lower bearing shell and a lower thrust plate; The upper bearing and the lower bearing are provided with fixing grooves on both sides of their side walls; The inner arc surfaces of the upper thrust plate and the lower thrust plate are provided with protrusions; The protrusion of the upper thrust plate is interference-fitted with the fixing groove of the upper bearing bush; The protrusion of the lower thrust plate is interference-fitted with the fixing groove of the lower bearing.

3. The lubricated crankshaft structure according to claim 2, characterized in that, The upper thrust plate has a double-sided wedge-shaped oil groove on its thrust surface; The thrust surface of the lower thrust plate is provided with the single wedge-shaped oil groove and the double wedge-shaped oil groove.

4. The lubricated crankshaft structure according to claim 3, characterized in that, The lower thrust plate has a second oil hole provided in the single wedge-shaped oil groove.

5. The lubricated crankshaft structure according to claim 2, characterized in that, Oil grooves are provided on the inner arc surfaces of the upper bearing and the lower bearing.

6. The lubricated crankshaft structure according to claim 5, characterized in that, The lower bearing bush is provided with the first oil hole in the oil groove; The upper bearing bush is provided with an oil supply hole in the oil groove.

7. The lubricated crankshaft structure according to claim 1, characterized in that, The thrust bearing cover is provided with a thrust groove, which is used to fix the lower thrust plate.

8. The lubricated crankshaft structure according to claim 2, characterized in that, The upper bearing and the lower bearing are provided with positioning lips on their outer arc surfaces, and the positioning lips are used to axially position the upper bearing and the lower bearing.

9. The lubricated crankshaft structure according to claim 2, characterized in that, Bearing liners are provided on the inner arc surfaces of the upper and lower bearing shells, and the bearing liners are used to reduce wear between the upper and lower bearing shells and the crankshaft journal.

10. The lubricated crankshaft structure according to claim 5, characterized in that, The oil trough can be oriented axially, circumferentially, obliquely, or spirally.

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