A split bearing for crankshaft of a high-horsepower two-stroke internal combustion engine

Abstract

The present invention relates to the technical field of split bearings and lubrication and cooling thereof, and discloses a split bearing for a crankshaft of a high-horsepower two-stroke internal combustion engine, comprising a crankcase, a crankshaft, a split needle roller bearing assembly, a deep groove ball bearing and a needle roller bearing, wherein the crankcase is designed with a mounting interface matching the split needle roller bearing assembly, and an assembly structure integrated with other mechanical parts such as deep groove ball bearings, needle roller bearings, crankshafts, etc. The split bearing for the crankshaft of a high-horsepower two-stroke internal combustion engine realizes effective lubrication of the needle roller by designing a high-precision split needle roller bearing assembly and an oil and gas channel, while the presence of exhaust gas also contributes to cooling and improves heat dissipation performance, and the split needle roller bearing assembly adopts a shell manufactured by a breaking and separating process and a two-piece retainer design, which not only improves the accuracy and strength of the bearing assembly, reduces the failure rate of the internal combustion engine, improves the overall operation effect of the equipment, but also facilitates installation and disassembly.

Description

Technical Field

[0001] The invention relates to the technical field of split bearings and lubrication and cooling thereof, in particular to a split bearing for a crankshaft of a high-horsepower two-stroke internal combustion engine. Background Art

[0002] The existing four-stroke internal combustion engine crankshaft adopts the main bearing form, which can meet the use requirements through forced lubrication of engine oil. However, for some high-horsepower two-stroke engines, especially those with split crankshafts, split bearings are required, and mixed oil and gas are used to cool and lubricate them through the pressure changes in the crankcase.

[0003] Compared with the four-stroke internal combustion engine, the two-stroke internal combustion engine does not have an independent lubrication system, cannot force lubrication of the bearing neck, and is easily burned by high temperature. Therefore, traditional main bearings cannot be used. High-horsepower two-stroke internal combustion engines have higher requirements for the strength of the crankshaft. The strength of the combined crankshaft connecting rod with bearings cannot meet the use requirements. Therefore, a split bearing for the crankshaft of a high-horsepower two-stroke internal combustion engine is urgently needed. Summary of the invention

[0004] The object of the present invention is to provide a split bearing for a crankshaft of a high-horsepower two-stroke internal combustion engine to solve the problems raised in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a split bearing for a crankshaft of a high-horsepower two-stroke internal combustion engine, comprising a crankcase, a crankshaft, a split needle roller bearing assembly, a deep groove ball bearing and a needle roller bearing,

[0006] The crankcase is designed with a mounting interface matching the split needle roller bearing assembly, and an assembly structure integrated with other mechanical components such as deep groove ball bearings, needle roller bearings, crankshafts, etc.;

[0007] The needle bearing can ensure the accuracy and stability of the crankshaft during operation;

[0008] The deep groove ball bearing is used to support the crankshaft and transmit the radial load and a certain degree of axial load generated by the crankshaft;

[0009] The split needle roller bearing assembly includes a housing, a retaining frame, a needle roller, a retaining spring, and an oil and gas channel. The housing is designed to be detachable, the retaining frame is divided into two pieces and the needle roller is embedded therein, the retaining spring is used to fix the retaining frame in the housing, and the oil and gas channel is arranged on the housing to receive oil and gas in the crankcase.

[0010] The crankcase is one of the key components of an internal combustion engine. The crankcase is designed with an installation interface that matches the split needle roller bearing assembly, as well as an assembly structure integrated with other mechanical components (such as deep groove ball bearings, needle roller bearings, crankshafts, etc.). The crankshaft is a key component in an internal combustion engine that converts the reciprocating motion of the piston into rotational motion. The deep groove ball bearing is mainly used to support the crankshaft. Due to its compact structure, the deep groove ball bearing can withstand large radial and axial loads. The groove design on its inner and outer rings can accommodate multiple steel balls. These steel balls roll between the inner and outer rings, thereby reducing friction resistance and energy loss, so that the radial and a certain degree of axial load generated by the crankshaft can be well transmitted. The needle roller bearing can ensure the accuracy and stability of the crankshaft during operation, and the rollers of the needle roller bearing are slender, occupying a small space, and can provide high load capacity in the radial space. The needle roller bearing also has high precision and wear resistance, can adapt to various harsh environments, and ensure the stable operation of the crankshaft when it rotates, thereby ensuring the efficient, stable and safe operation of the internal combustion engine.

[0011] Preferably, the housing is made of high-strength, corrosion-resistant material and is assembled between the main journal of the crankshaft and the main bearing hole of the housing by means of a breaking and separation process.

[0012] Preferably, the retaining frame is made of a lightweight and high-strength material to reduce friction loss, and the matching accuracy between the needle roller and the retaining frame is ensured through precise processing.

[0013] Preferably, the needle roller has extremely high diameter tolerance requirements to ensure accurate fit with the crankshaft and the main bearing hole of the housing, and the needle roller is made of high-precision, wear-resistant material.

[0014] As a key rolling element in the bearing, the diameter tolerance of the needle roller is extremely high. The diameter of the needle roller must fluctuate within a very strict range to ensure precise fit with the crankshaft main journal and the main bearing hole of the housing, which can reduce friction, improve operating efficiency and extend the life of the bearing. The needle roller is made of high-precision and wear-resistant materials. The high-precision material ensures the size and shape accuracy of the needle roller, so that it can maintain a stable rolling track during operation and reduce vibration and noise. The wear-resistant material extends the service life of the needle roller and reduces the performance degradation and failure risk caused by wear. It has excellent mechanical properties and wear resistance and can withstand the huge stress and friction generated during the operation of the internal combustion engine. The needle roller supports and transmits the load on the crankshaft in the split bearing, and also reduces friction loss and energy loss through rolling motion.

[0015] Preferably, the retaining spring is designed with an elastic locking structure to adapt to retaining frames and housings of different sizes and ensure structural stability.

[0016] Preferably, a lubricating oil circuit and an air circuit are integrated inside the crankcase.

[0017] Preferably, the oil and gas in the crankcase are connected to the oil and gas channel on the outer shell of the split needle roller bearing assembly through a one-way valve, forming a complete lubrication cycle to lubricate the needle roller.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0019] The present invention realizes effective lubrication of the needle roller by designing a high-precision split needle roller bearing assembly and an oil and gas channel. At the same time, the presence of exhaust gas also contributes to cooling and improves heat dissipation performance. The split needle roller bearing assembly adopts a shell manufactured by an expansion and breaking separation process and a two-piece retainer design, which not only improves the accuracy and strength of the bearing assembly, reduces the failure rate of the internal combustion engine, improves the overall operation effect of the equipment, but also facilitates installation and disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the application structure of the split needle roller bearing assembly in the crankcase;

[0021] Figure 2 It is a schematic diagram of the structure of a split needle roller bearing assembly.

[0022] Among them: 1. Crankcase; 2. Crankshaft; 3. Split needle roller bearing assembly; 4. Deep groove ball bearing; 5. Needle roller bearing; 31. Housing; 32. Cage; 33. Needle roller; 34. Circlip; 35. Oil and gas channel. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The present invention provides the following technical solutions:

[0025] See also Figure 1 , Figure 2 A split bearing for a crankshaft of a high-horsepower two-stroke internal combustion engine, comprising a crankcase 1, a crankshaft 2, a split needle roller bearing assembly 3, a deep groove ball bearing 4 and a needle roller bearing 5,

[0026] The crankcase 1 is designed with a mounting interface matching the split needle roller bearing assembly 3, and an assembly structure integrated with other mechanical components such as the deep groove ball bearing 4, the needle roller bearing 5, the crankshaft 2, etc.;

[0027] The needle bearing 5 can ensure the accuracy and stability of the crankshaft 2 during operation;

[0028] The deep groove ball bearing 4 is used to support the crankshaft 2 and transmit the radial load and a certain degree of axial load generated by the crankshaft 2;

[0029] The split needle roller bearing assembly 3 includes a housing 31, a retaining frame 32, a needle roller 33, a retaining spring 34 and an oil and gas channel 35. The housing 31 is designed to be detachable, the retaining frame 32 is divided into two pieces and the needle roller 33 is embedded therein, the retaining spring 34 is used to fix the retaining frame 32 in the housing 31, and the oil and gas channel 35 is arranged on the housing 31 for receiving oil and gas in the crankcase 1.

[0030] Through the above technical solution, the crankcase 1 is one of the key components of the internal combustion engine. The crankcase 1 is designed with an installation interface matching the split needle roller bearing assembly 3, and an assembly structure integrated with other mechanical components such as deep groove ball bearings 4, needle roller bearings 5, crankshaft 2, etc. The crankshaft 2 is a key component in the internal combustion engine that converts the reciprocating motion of the piston into rotational motion. The deep groove ball bearing 4 is mainly used to support the crankshaft 2. Due to the compact structure of the deep groove ball bearing 4, it can withstand large radial and axial loads. The groove design on its inner and outer rings can accommodate multiple steel balls. These steel balls roll between the inner and outer rings, thereby reducing friction resistance and energy loss, so that the radial and a certain degree of axial loads generated by the crankshaft 2 can be well transmitted. The needle roller bearing 5 can ensure the accuracy and stability of the crankshaft during operation, and the rollers of the needle roller bearing 5 are slender, occupying a small space, and can provide high load capacity in the radial space. The needle roller bearing also has high precision and wear resistance, can adapt to various harsh environments, and ensure the stable operation of the crankshaft 2 when it rotates, thereby ensuring the efficient, stable and safe operation of the internal combustion engine.

[0031] The housing 31 is made of high-strength, corrosion-resistant material and is assembled between the main journal of the crankshaft and the main bearing hole of the housing through a breaking and separation process.

[0032] Through the above technical solution, since the housing 31 needs to withstand the huge stress and load generated when the crankshaft 2 is running, it must have high strength to ensure that it will not be deformed or damaged during use. Since the working environment of the internal combustion engine is usually harsh, involving high temperature, high pressure, grease and corrosive substances, the material of the housing 31 must have good corrosion resistance to extend its service life. In addition, the housing material should also have good processing performance and thermal stability; wherein the housing 31 is assembled between the main journal of the crankshaft 2 and the main bearing hole of the housing through the expansion and breaking separation process. The expansion and breaking separation process utilizes the elastic deformation and plastic deformation characteristics of the material, and the outer shell is expanded at a specific position through the action of external force, so as to achieve a close fit with the crankshaft main journal and the main bearing hole of the housing, and achieve the effects of high assembly accuracy, good reliability and high assembly efficiency. The outer shell 31 is assembled between the crankshaft main journal and the housing main bearing hole to support and fix the crankshaft 2. At the same time, it also cooperates with other components of the split needle roller bearing assembly such as the retaining frame 32, the needle roller 33 and the retaining spring 34 to ensure the accuracy and stability of the crankshaft 2 during operation.

[0033] The cage 32 is made of a light and high-strength material to reduce friction loss, and the matching accuracy between the needle roller 33 and the cage 32 is ensured through precise processing.

[0034] Through the above technical solution, the retainer 32 is made of lightweight and high-strength material. The use of lightweight materials helps to reduce the overall weight of the bearing assembly, thereby reducing the energy consumption of the internal combustion engine and improving its dynamic performance. By reducing the weight, the moment of inertia can be reduced and the acceleration response can be improved. While the retainer needs to be lightweight, it must also have sufficient strength to support the needle roller 33 and withstand various stresses during operation. Therefore, the high-strength material ensures the reliability and durability of the retainer 32 under long-term, high-load operation, and the retainer 32 ensures the accuracy of its size and shape through precise processing, and the accuracy ensures the matching accuracy between the needle roller 33 and the retainer 32. The improvement of the matching accuracy between the two can reduce friction loss, improve operating efficiency and extend the life of the bearing, thereby ensuring the overall performance and stability of the high-horsepower two-stroke internal combustion engine.

[0035] The needle roller 33 has extremely high diameter tolerance requirements to ensure accurate fit with the crankshaft 2 and the main bearing hole of the housing, and the needle roller 33 is made of high-precision, wear-resistant material.

[0036] Through the above technical solution, the needle roller 33, as a key rolling element in the bearing, has an extremely high diameter tolerance requirement. The diameter of the needle roller must fluctuate within a very strict range to ensure precise matching with the crankshaft main journal and the main bearing hole of the housing, which can reduce friction, improve operating efficiency and extend the life of the bearing. The needle roller 33 is made of high-precision, wear-resistant material, wherein the high-precision material ensures the size and shape accuracy of the needle roller, so that it can maintain a stable rolling track during operation, reduce vibration and noise, and the wear-resistant material extends the service life of the needle roller 33, reduces the performance degradation and failure risk caused by wear, and makes it have excellent mechanical properties and wear resistance, and can withstand the huge stress and friction generated during the operation of the internal combustion engine. The needle roller 33 supports and transmits the load on the crankshaft 2 in the split bearing, and also reduces friction loss and energy loss through rolling motion.

[0037] The clamping spring 34 is designed with an elastic locking structure to adapt to the holder 32 and the housing 31 of different sizes and ensure the structural stability.

[0038] Through the above technical scheme, the elastic locking structure set by the retaining spring 34 enables it to adapt to retaining frames 32 and housings 31 of different sizes. When the retaining spring 34 is installed in place, the prestressed part in its elastic locking structure will generate a restoring force, which will tightly fix the retaining spring between the retaining frame 32 and the housing 31. The generated restoring force not only ensures the fixing effect of the retaining spring 34, but also provides additional stability and reliability. Since there may be slight size differences in the manufacturing and assembly process of the crankshaft bearing assembly of the internal combustion engine, the elastic locking structure can ensure that the retaining spring 34 can be tightly fixed between the retaining frame 32 and the housing 31 under various circumstances, and the elastic locking structure also provides additional stability and reliability. When the internal combustion engine is running, the bearing assembly will be affected by various stresses and vibrations. The elastic locking structure can absorb these stresses and vibrations to prevent the retaining spring 34 from loosening or falling off, thereby ensuring the overall stability and safety of the bearing assembly.

[0039] The crankcase 1 has a lubricating oil circuit and a gas circuit integrated therein.

[0040] Through the above technical scheme, the main function of the lubricating oil circuit inside the crankcase 1 is to provide continuous lubrication for the crankshaft bearings, and the crankshaft bearings are split needle roller bearing assemblies 3, deep groove ball bearings 4 and needle roller bearings 5. The lubricating oil circuit includes an oil inlet, an oil outlet and an oil channel connecting these ports. The setting of the oil channel ensures that the lubricating oil can be evenly distributed in various parts of the bearing assembly. During the operation of the internal combustion engine, the crankshaft bearings will be subjected to huge friction and wear. The lubricating oil circuit can effectively reduce friction and wear and extend the service life of the bearings by spraying or circulating lubricating oil to the bearing assembly. The air circuit includes an air inlet and an exhaust port, both of which are arranged on the crankcase 1 to ensure that air can smoothly enter and discharge the combustion chamber. Integrating the lubricating oil circuit and the air circuit inside the crankcase 1 can greatly reduce the overall size and weight of the internal combustion engine and improve its compactness. The integrated design reduces external connections and pipelines, reduces the risk of leakage and failure, and improves the reliability of the internal combustion engine, providing an efficient, reliable and compact lubrication and air supply system for high-horsepower two-stroke internal combustion engines.

[0041] The oil and gas in the crankcase 1 are connected to the oil and gas channel 35 on the housing 31 of the split needle roller bearing assembly through a one-way valve, forming a complete lubrication cycle to lubricate the needle roller 33.

[0042] Through the above technical solution, during the operation of the internal combustion engine, a certain amount of oil-gas mixture will be generated inside the crankcase 1. The oil-gas mixture is mainly composed of engine oil vapor and exhaust gas generated by combustion. The one-way valve is set to allow the oil and gas to flow from the crankcase 1 to the oil and gas channel 35 of the outer shell 31 of the split needle roller bearing assembly 3, but prevent the oil and gas from flowing back to the crankcase 1. The design of the one-way valve ensures the one-way flow of oil and gas. When the pressure in the crankcase 1 is higher than the pressure in the outer shell 31 of the split needle roller bearing assembly 3, the one-way valve opens to allow oil and gas to enter the outer shell 31. Conversely, when the pressure in the outer shell 31 is higher than the pressure in the crankcase 1, the one-way valve closes to prevent To prevent oil and gas backflow, an oil and gas channel 35 is designed on the shell 31 of the split needle roller bearing assembly 3, and the oil and gas channel 35 is connected to the one-way valve. When the oil and gas enter the shell 31 through the one-way valve, they will penetrate into the rolling contact area of ​​the needle roller bearing assembly through the oil and gas channel 35. The engine oil component in the oil and gas mixture will form a lubricating film between the needle roller 33 and the bearing seat to reduce friction and wear. The feature that the oil and gas in the crankcase 1 are connected to the oil and gas channel 35 of the shell 31 of the split needle roller bearing assembly 3 through the one-way valve provides a high-efficiency, energy-saving and environmentally friendly lubrication method for high-horsepower two-stroke internal combustion engines, and the presence of exhaust gas also helps to cool the bearing assembly.

[0043] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit thereof, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A split bearing for a crankshaft of a high-horsepower two-stroke internal combustion engine, comprising a crankcase (1), a crankshaft (2), a split needle roller bearing assembly (3), a deep groove ball bearing (4) and a needle roller bearing (5), characterized in that: The crankcase (1) is designed with a mounting interface matching the split needle roller bearing assembly (3), and an assembly structure integrated with other mechanical components such as a deep groove ball bearing (4), a needle roller bearing (5), a crankshaft (2), etc.; The needle roller bearing (5) can ensure the accuracy and stability of the crankshaft (2) during operation; The deep groove ball bearing (4) is used to support the crankshaft (2) and transmit the radial load and a certain degree of axial load generated by the crankshaft (2); The split needle roller bearing assembly (3) comprises a housing (31), a retaining frame (32), a needle roller (33), a retaining spring (34) and an oil and gas passage (35); the housing (31) is designed to be detachable; the retaining frame (32) is divided into two pieces and the needle roller (33) is embedded therein; the retaining spring (34) is used to fix the retaining frame (32) in the housing (31); and the oil and gas passage (35) is arranged on the housing (31) and is used to receive oil and gas in the crankcase (1).

2. A split bearing for a crankshaft of a high-horsepower two-stroke internal combustion engine according to claim 1, characterized in that: The housing (31) is made of high-strength, corrosion-resistant material and is assembled between the main journal of the crankshaft and the main bearing hole of the housing through a breaking and separation process.

3. A split bearing for a crankshaft of a high-horsepower two-stroke internal combustion engine according to claim 1, characterized in that: The retaining frame (32) is made of a light and high-strength material to reduce friction loss, and the matching accuracy between the needle roller (33) and the retaining frame (32) is ensured through precise processing.

4. A split bearing for a crankshaft of a high-horsepower two-stroke internal combustion engine according to claim 1, characterized in that: The needle roller (33) has extremely high diameter tolerance requirements to ensure accurate matching with the crankshaft (2) and the main bearing hole of the housing, and the needle roller (33) is made of high-precision, wear-resistant material.

5. The split bearing for a crankshaft of a high-horsepower two-stroke internal combustion engine according to claim 1, characterized in that: The clamping spring (34) is designed with an elastic locking structure to adapt to retaining frames (32) and housings (31) of different sizes and ensure structural stability.

6. A split bearing for a crankshaft of a high-horsepower two-stroke internal combustion engine according to claim 1, characterized in that: A lubricating oil circuit and a gas circuit are integrated inside the crankcase (1).

7. A split bearing for a crankshaft of a high-horsepower two-stroke internal combustion engine according to claim 1, characterized in that: The oil and gas in the crankcase (1) are connected to the oil and gas channel (35) on the housing (31) of the split needle roller bearing assembly through a one-way valve, forming a complete lubrication cycle to lubricate the needle roller (33).

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