Lubricating crankshaft structure

Abstract

The invention discloses a lubricating crankshaft structure which is used for rapidly lubricating a crankshaft, reducing the wear rate of the crankshaft and prolonging the service life of an engine. The thrust bearing 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 and the lower thrust bearing bush are connected in a central symmetry manner; an inclined oil hole is formed in the thrust bearing cover and is used for transmitting engine oil; a first oil hole is formed in the inner arc surface of the lower thrust bearing bush; a second oil hole is formed in the thrust surface of the lower thrust bearing bush; an oil conveying hole in the inner arc surface of the upper thrust bearing shell is communicated with a main oil duct of an engine; two ends of the inclined oil hole are communicated with the first oil hole and the second oil hole; wedge-shaped oil grooves are formed in the thrust surfaces of the upper thrust bearing shell and the lower thrust bearing shell, comprise single-wedge-shaped oil grooves and double-edge wedge-shaped oil grooves, and are used for forming wedge-effect rapid lubrication thrust surfaces.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to a lubricating crankshaft structure. Background Art

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

[0003] When the engine is working, the crankshaft will generate axial movement force in addition to rotational movement, which may cause abnormal movement of the connecting rod, thus affecting the normal operation of the engine. In order to maintain the normal operation of the crankshaft, thrust washers are usually used to fill the gap and limit the axial movement of the crankshaft. At the same time, when the engine oil circulates inside the engine, it will splash lubricate the parts, and the oil film formed can reduce friction. The thrust washers also help maintain the stability of the oil film, thereby reducing the friction loss of the crankshaft.

[0004] However, when the engine is started and stopped frequently and the clutch is disengaged for a long time, the thrust force will act on the crankshaft for a long time. The splash lubrication method combined with the traditional thrust plate cannot quickly establish an oil film, which may cause increased crankshaft wear and reduce the service life of the engine. Summary of the invention

[0005] The present application provides a lubricating crankshaft structure for quickly lubricating the crankshaft, reducing the crankshaft wear rate, and increasing the service life of the engine.

[0006] The present application provides a lubricating 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 is centrally symmetrically connected to the lower thrust bearing;

[0009] The thrust bearing cover is provided with an oblique oil hole, and the oblique oil hole is used to transmit engine oil;

[0010] A first oil hole is provided on the inner arc surface of the lower thrust bearing;

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

[0012] The oil delivery hole on the inner arc surface of the upper thrust bearing is connected to the main oil channel 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] Wedge-shaped oil grooves are arranged on the thrust surfaces of the upper thrust bearing and the lower thrust bearing. The wedge-shaped oil grooves include single wedge-shaped oil grooves and double-sided wedge-shaped oil grooves. The wedge-shaped oil grooves are used to form a wedge effect to quickly lubricate the thrust surfaces.

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

[0016] The lower thrust bearing comprises a lower bearing and a lower thrust plate;

[0017] Both side walls of the upper bearing shell and the lower bearing shell are provided with fixing grooves;

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

[0019] The convex portion of the upper thrust plate is interference-fitted with the fixing groove of the upper bearing shell;

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

[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-sided wedge-shaped oil groove.

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

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

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

[0026] The oil delivery hole is arranged in the oil groove of the upper bearing shell.

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

[0028] Optionally, positioning lips are provided on the outer arc surfaces of the upper bearing shell and the lower bearing shell, and the positioning lips are used for axially positioning the upper bearing shell and the lower bearing shell.

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

[0030] Optionally, the oil groove is oriented in an axial direction, a circumferential direction, an oblique direction or a spiral direction.

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

[0032] The oil delivery hole on the inner arc surface of the upper thrust bearing is connected to the main oil channel of the engine. The thrust bearing cover is provided with an oblique oil hole, which is connected to the first oil hole on the inner arc surface of the lower thrust bearing and the second oil hole on the thrust surface, so as to quickly provide sufficient oil to the thrust surface and the crankshaft journal. The single wedge-shaped oil groove and the double-sided wedge-shaped oil groove on the upper thrust bearing and the lower thrust bearing can effectively store the oil. When the crankshaft is running, the single wedge-shaped oil groove and the double-sided wedge-shaped oil groove will produce a wedge effect, so that the oil is evenly distributed on the thrust surface, and an oil film is quickly formed, thereby reducing the wear rate and increasing the service life of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solution in the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 A schematic structural diagram of an embodiment of the lubricating crankshaft structure provided in the present application;

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

[0036] Figure 3 A schematic structural diagram of another embodiment of the lubricating crankshaft structure provided in the present application. DETAILED DESCRIPTION

[0037] The present application provides a lubricating crankshaft structure for quickly lubricating the crankshaft, reducing the crankshaft wear rate, and increasing the service life of the engine.

[0038] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only used to illustrate the relative positional relationships between the various components or components, and do not particularly limit the specific installation orientations of the various components or components.

[0039] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0040] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] In addition, the structures, proportions, sizes, etc. drawn in the drawings in the present application are only used to match the contents disclosed in the specification for the technical personnel in this field to understand and read, and are not used to limit the restrictive conditions under which the present application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present application without affecting the effects and purposes that can be achieved by the present application.

[0042] The following will be combined with the drawings in this application to clearly and completely describe the technical solutions in this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] See also Figure 1 and Figure 2 , an embodiment of the lubricating crankshaft structure in the present application comprises: a thrust bearing cap 1, an upper thrust bearing bush 2 and a lower thrust bearing bush 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 connected in a centrally symmetrical manner;

[0046] The thrust bearing cover 1 is provided with an oblique oil hole 4, which is used to transmit 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 delivery hole on the inner arc surface of the upper thrust bearing 2 is connected to the main oil channel of the engine;

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

[0051] Wedge-shaped oil grooves are provided on the thrust surfaces of the upper thrust bearing 2 and the lower thrust bearing 3. 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 to quickly lubricate the thrust surfaces.

[0052] Thrust bearing cover 1: supports and fixes the lower thrust bearing 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, while generating an oil film to reduce crankshaft wear.

[0054] The crankshaft is the core component of the engine, responsible for converting the linear motion of the piston into rotational motion. When the engine is working, the internal connecting rod runs up and down at high speed, and the connecting rod generates force and applies it to the crankshaft, driving the crankshaft to rotate. In order to ensure the stable operation of the crankshaft, it needs to be fixed and supported, and the crankshaft will produce friction with the surrounding components, accelerating the wear of the crankshaft and components. At this time, the efficiency of the engine may decrease, and in severe cases, the crankshaft may break, affecting the service life of the engine. In order to reduce the wear of the crankshaft, an integral thrust sleeve or a split thrust bearing is usually used to fix and support the crankshaft journal, and engine oil is injected into the thrust sleeve or thrust bearing. With the operation of the crankshaft, an oil film is formed between the thrust sleeve or thrust bearing and the crankshaft, thereby reducing the wear of the crankshaft.

[0055] In this embodiment, a split thrust bearing structure is used, and the split thrust bearing structure can be flexibly adjusted according to the actual working state. The inner arc surface of the thrust bearing cover 1 is connected to the outer arc surface of the lower thrust bearing 3, the upper thrust bearing 2 is connected to the lower thrust bearing 3 in a centrally symmetrical manner, and the crankshaft journal is installed between the upper thrust bearing 2 and the lower thrust bearing 3. The thrust bearing cover 1, the upper thrust bearing 2 and the lower thrust bearing 3 cooperate with each other to provide necessary support for the crankshaft, limit the movement of the crankshaft in the axial direction, and enable the crankshaft to rotate according to a predetermined trajectory. The structure composed of the thrust bearing cover 1, the upper thrust bearing 2 and the lower thrust bearing 3 can achieve precise matching between the components, prevent vibration and noise caused by the axial movement of the crankshaft, reduce energy loss, and improve the operating efficiency and stability of the engine. At the same time, an oil delivery hole connected to the main oil channel of the engine is opened on the upper thrust bearing 2, and an oblique oil hole 4 is opened on the inner arc surface of the thrust bearing cover 1. The two ends of the oblique oil hole 4 are connected 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 of the lower thrust bearing 3. Wedge-shaped oil grooves are opened on the thrust surfaces of the upper thrust bearing 2 and the lower thrust bearing 3, and the wedge-shaped oil grooves include single wedge-shaped oil grooves and double-sided wedge-shaped oil grooves. When the engine is working, the oil in the main oil channel of the engine passes through the oil delivery hole on the upper thrust bearing 2 to lubricate the crankshaft journal. At the same time, the oil on the inner arc surface of the upper thrust bearing 2 and the lower thrust bearing 3 flows to the single wedge-shaped oil groove on the thrust surface through the first oil hole 5 on the lower thrust bearing 3, the oblique oil hole 4 on the thrust bearing cover 1 and the second oil hole 6 on the lower thrust bearing 3. The operation of the crankshaft drives the oil to flow into the double-sided wedge-shaped oil grooves on the upper thrust bearing 2 and the lower thrust bearing 3, and the operation of the crankshaft produces a wedge effect, so that the oil pushes back the crankshaft, quickly forms an oil film, and reduces the wear rate. The single wedge-shaped oil groove 7 and the double-sided wedge-shaped oil groove 8 on the thrust surface can effectively store the oil on the thrust surface, reduce the loss of oil, and maintain the lubrication effect.

[0056] In this embodiment, the oil delivery hole on the inner arc surface of the upper thrust bearing 2 is connected to the main oil channel of the engine, and the thrust bearing cover 1 is provided with an oblique oil hole 4, which is connected 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, and the oil is transferred to the crankshaft journal and the thrust surface, so as to quickly provide sufficient oil to the thrust surface and the crankshaft journal. The single wedge-shaped oil groove 7 and the double-sided wedge-shaped oil groove 8 on the upper thrust bearing 2 and the lower thrust bearing 3 can effectively store the oil. When the crankshaft is running, the single wedge-shaped oil groove 7 and the double-sided wedge-shaped oil groove 8 will produce a wedge effect, so that the oil is evenly distributed on the thrust surface, and an oil film is quickly formed, thereby reducing the wear rate and improving the service life of the engine.

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

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

[0059] The two side walls of the upper bearing shell 21 and the lower bearing shell 31 are provided with fixing grooves 9;

[0060] The inner arc surface of the upper thrust piece 22 and the lower thrust piece 32 is provided with a convex portion 10;

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

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

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

[0064] The lower thrust plate 32 and the upper thrust plate 22 are respectively installed on the two side walls of the upper bearing shell 21 and the lower bearing shell 31, and are auxiliary components for enhancing the stability of the upper bearing shell 21 and the lower bearing shell 31, lubricating the thrust surface and dispersing the crankshaft load.

[0065] The traditional crankshaft lubrication structure uses a split assembly of thrust bearings and thrust plates. Although the thrust bearings and thrust plates can be adjusted according to the actual working conditions, the connecting rod continuously works at high speed to drive the crankshaft, which has a huge rotational force. Due to the influence of the rotational force, the thrust plate of the split assembly is easy to fall off, causing engine failure. At the same time, the split assembly is also prone to the situation of thrust plates missing, resulting in a decrease in the precision of the fit between the components and insufficient lubrication.

[0066] In this embodiment, the upper thrust bearing shell 2 is composed of an upper bearing shell 21 and an upper thrust plate 22, and the lower thrust bearing shell 3 is composed of a lower bearing shell 31 and a lower thrust plate 32. The two side walls of the upper bearing shell 21 and the lower bearing shell 31 are provided with fixing grooves 9, and the inner arc surfaces of the upper thrust plate 22 and the lower thrust plate 32 are provided with convex portions 10, which are respectively interference-matched with the fixing grooves 9 of the upper bearing shell 21 and the lower bearing shell 31, so that the upper bearing shell 21 and the upper thrust plate 22 form an integrated structure, and the lower bearing shell 31 and the lower thrust plate 32 form an integrated structure, wherein the fixing grooves 9 and the convex portions 10 may be multiple. The design of the fixing grooves 9 and the convex portions 10 enables the thrust plate and the bearing shell to form an integrated structure, which can ensure the flexible use of the thrust plate and the bearing shell, and can also reduce the problem of missing or falling off of the thrust plate, improve the assembly efficiency of the thrust plate and the bearing shell, and reduce the mis-assembly rate.

[0067] See also 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-sided 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. The engine oil flows into the single wedge-shaped oil groove 7 on the thrust surface of the lower thrust plate 32 through the second oil hole 6. The single wedge-shaped oil groove 7 can store the engine oil and reduce the loss of the engine oil from the thrust surface. The thrust surfaces of the upper thrust plate 22 and the lower thrust plate 32 are both provided with double-sided wedge-shaped oil grooves 8 to increase the ability to store engine oil and maintain the lubrication effect. Among them, the second oil hole 5, the single wedge-shaped oil groove 7 and the double-sided wedge-shaped oil grooves 8 can be provided in multiple numbers. When the crankshaft is running, the engine oil in the single wedge-shaped oil groove 7 is evenly distributed on the thrust surface. At the same time, the double-sided wedge-shaped oil grooves 8 continue to store the engine oil, strengthen the wedge effect, and make the oil film form quickly and maintain the oil film for a long time to cope with the frequent start and stop of the engine and reduce the wear of the crankshaft.

[0071] See also Figure 1 and Figure 3 In an optional embodiment, an oil groove 11 is provided on the inner arc surface of the upper bearing shell 21 and the lower bearing shell 31. The oil groove 11 is oriented in an axial direction, a circumferential direction, an oblique direction or a spiral direction.

[0072] In this embodiment, an oil groove 11 is provided on the inner arc surface of the upper bearing 21 and the lower bearing 31, and the edge of the oil groove 11 is smooth to ensure that the engine oil can be smoothly introduced into the lubricated surface. In order to avoid the reduction of the load-bearing capacity of the thrust bearing, the oil groove 11 is usually provided in the non-load-bearing area, and the direction of the oil groove 11 can be axial, circumferential, oblique or spiral, etc., so as to adapt to different lubrication requirements. For the axial oil groove, the axial oil groove of the split thrust bearing is usually provided at the split surface of the thrust bearing to reduce the loss of the engine oil flowing out of the split surface too early, and the axial oil groove generally cannot be made into an axial through groove to prevent the engine oil from flowing out of the oil sealing surface from both ends of the thrust bearing. For the circumferential oil groove, generally only half a circle is opened and does not extend to the load-bearing area. If the engine oil needs to flow in one direction, a spiral oil groove can be provided. The oil grooves 11 on the inner arc surfaces of the upper bearing shell 21 and the lower bearing shell 31 can reduce the loss of engine oil caused by premature outflow from the split surface, while guiding the engine oil to lubricate the crankshaft journal, thereby improving the lubrication capacity.

[0073] See also 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 shell 31;

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

[0075] In this embodiment, the oil delivery hole is connected to the main oil channel, and the engine oil flows out of the oil delivery hole from the main oil channel 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 through the oil groove 11 to flow into the first oil hole 5 of the lower bearing 31. Since the first oil hole 5 is connected to the oblique oil hole 4, the engine oil will flow out of the second oil hole 6 through the oblique oil hole 4 and reach the thrust surface, thereby providing sufficient engine oil for the thrust surface and improving the lubrication efficiency.

[0076] See also Figure 2 and Figure 3 In an optional embodiment, a thrust groove 12 is provided on the thrust bearing cover 1 , and the thrust groove 12 is used to fix the lower thrust plate 32 .

[0077] The thrust groove 12 is a semicircular groove on both sides of the thrust bearing cover 1 , adapted to the lower thrust plate 32 , and used to limit the position of the lower thrust plate 32 .

[0078] No relative movement is allowed between the thrust bearing and the thrust bearing. When the crankshaft is running, due to the rotation of the crankshaft and the axial load, the friction force will be transmitted to the surface of the thrust bearing through the oil film, so that the thrust bearing tends to move in the axial or circumferential direction. In order to prevent the thrust bearing from moving in the axial or circumferential direction, the thrust bearing must be positioned. At the same time, it is also necessary to ensure the correct assembly of the thrust bearing. If the thrust bearing is not assembled properly, it may cause the bearing to burn and the shaft to stick. That is, the thrust bearing and the crankshaft will melt due to the high temperature generated by friction, resulting in the two being tightly combined and unable to be separated. Therefore, the design of the thrust bearing and the thrust bearing cover needs to ensure the correct assembly and sufficient lubrication of the bearing, so as to effectively prevent the occurrence of bearing burn and shaft sticking accidents.

[0079] In this embodiment, a semicircular 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 shell 3 is installed on the thrust bearing sleeve 1, the lower thrust plate 32 needs to be inserted into the thrust groove 12. The thrust groove 12 can limit the assembly position of the lower thrust plate 32, reduce the mis-assembly rate, and fix the lower thrust plate 32, reduce the relative movement between the lower thrust bearing shell 3 and the thrust bearing sleeve 1, and improve stability.

[0080] See also Figure 3 In an 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 for axially positioning 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, which corresponds to the groove on the inner arc surface of the thrust bearing sleeve 1. Usually, the upper bearing shell 21 is installed 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 in the groove on the thrust bearing sleeve 1, so as to realize the positioning of the upper bearing shell 21 and the lower bearing shell 31 on the thrust bearing sleeve 1, reduce the mis-assembly rate, and increase the stability of the crankshaft lubrication structure.

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

[0083] Thrust bearings are usually made of harder materials to share the load and support the crankshaft. When the crankshaft rotates, the thrust bearings and the crankshaft journal are in a state of friction. Long-term friction will cause wear debris from the thrust bearings, which will fall between the thrust bearings and the crankshaft journal or between other parts and the crankshaft. Since the thrust bearings are made of hard materials, even a small amount of wear debris may cause wear to the crankshaft.

[0084] In this embodiment, a bearing liner is provided on the inner arc surface of the upper bearing shell 21 and the lower bearing shell, and the bearing liner contacts the crankshaft. The bearing liner is softer than the metal material of the upper bearing shell 21 and the lower bearing shell 31, and is usually made of wear-resistant materials, such as bronze and aluminum alloy. The bearing liner has a smaller roughness and is more self-lubricating, which can improve the lubrication efficiency. Even if the bearing liner produces wear debris, the wear debris is relatively soft, which can reduce the wear on the crankshaft. In addition, the inner arc surface of the upper bearing shell 21 and the lower bearing shell 31 usually has structures such as tenons, grooves or threads. The bearing liner is embedded into the inner arc surface of the upper bearing shell 21 and the lower bearing shell 31 through the tenons, grooves or threads, so as to increase the fit between the upper bearing shell 21 and the lower bearing shell 31 and the bearing liner.

[0085] It should be noted that the above description of the disclosed embodiments enables professionals and technicians in the field to implement or use the present application. Various modifications to these embodiments will be apparent to professionals and technicians in the field, and the general principles defined herein can be implemented in other embodiments without departing from the scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A lubricating 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 is centrally symmetrically connected to the lower thrust bearing; The thrust bearing cover is provided with an oblique oil hole, and the oblique oil hole is used to transmit engine oil; A first oil hole is provided on the inner arc surface of the lower thrust bearing; A second oil hole is provided on the thrust surface of the lower thrust bearing; The oil delivery hole on the inner arc surface of the upper thrust bearing is connected to the main oil channel of the engine; The two ends of the inclined oil hole are connected to the first oil hole and the second oil hole; Wedge-shaped oil grooves are arranged on the thrust surfaces of the upper thrust bearing and the lower thrust bearing. The wedge-shaped oil grooves include single wedge-shaped oil grooves and double-sided wedge-shaped oil grooves. The wedge-shaped oil grooves are used to form a wedge effect to quickly lubricate the thrust surfaces.

2. The lubricating crankshaft structure according to claim 1, characterized in that: The upper thrust bearing comprises an upper bearing and an upper thrust plate; The lower thrust bearing comprises a lower bearing and a lower thrust plate; Both side walls of the upper bearing shell and the lower bearing shell are provided with fixing grooves; The inner arc surfaces of the upper thrust plate and the lower thrust plate are provided with convex parts; The convex portion of the upper thrust plate is interference-fitted with the fixing groove of the upper bearing shell; The protrusion of the lower thrust plate is interference-fitted with the fixing groove of the lower bearing shell.

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

4. The lubricating crankshaft structure according to claim 3, characterized in that: The second oil hole is arranged in the single wedge-shaped oil groove of the lower thrust plate.

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

6. The lubricating crankshaft structure according to claim 5, characterized in that: The first oil hole is provided in the oil groove of the lower bearing shell; The oil delivery hole is arranged in the oil groove of the upper bearing shell.

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

8. The lubricating crankshaft structure according to claim 2, characterized in that: Positioning lips are arranged on the outer arc surfaces of the upper bearing shell and the lower bearing shell, and the positioning lips are used for axially positioning the upper bearing shell and the lower bearing shell.

9. The lubricating crankshaft structure according to claim 2, characterized in that: Bearing bushings are arranged on the inner arc surfaces of the upper bearing shell and the lower bearing shell, and the bearing bushings are used to reduce the wear between the upper bearing shell and the lower bearing shell and the crankshaft journal.

10. The lubricating crankshaft structure according to claim 5, characterized in that: The oil groove is oriented in an axial direction, a circumferential direction, an oblique direction or a spiral direction.

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