Split bearing for crankshaft of high-horsepower two-stroke internal combustion engine

Abstract

The utility model relates to the technical field of split bearings and lubricating and cooling of the split bearings, and discloses a split bearing for a crankshaft of a high-horsepower two-stroke internal combustion engine, which comprises a crankcase, the crankshaft, a split needle bearing component, a deep groove ball bearing and a needle bearing. The crankcase is provided with an installation connector matched with the split needle bearing assembly and an assembly structure integrated with other mechanical parts such as a deep groove ball bearing, a needle bearing and a crankshaft. According to the split type bearing for the crankshaft of the high-horsepower two-stroke internal combustion engine, by designing the high-precision split type needle bearing assembly and the oil-gas channel, effective lubrication of the needle rollers is achieved, meanwhile, cooling is facilitated due to the existence of waste gas, the heat dissipation performance is improved, and the service life of the engine is prolonged. According to the split needle bearing assembly, the shell manufactured through the cracking separation process and the two-piece type retainer are designed, the precision and strength of the bearing assembly are improved, the failure rate of an internal combustion engine is reduced, the overall operation effect of equipment is improved, and mounting and dismounting are convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to split type bearing and its lubrication cooling technical field, concretely is a split type bearing for big horsepower two stroke internal combustion engine crankshaft. BACKGROUND

[0002] The existing four stroke internal combustion engine crankshaft adopts the main bearing bush form, and can meet the use requirement through the oil forced lubrication.

[0003] Compared with four stroke internal combustion engine, two stroke internal combustion engine does not have independent lubrication system, cannot force lubrication to bearing neck, is easy to high temperature burnout, therefore cannot adopt traditional main bearing bush, and the big horsepower two stroke internal combustion engine is higher to the strength requirement of crankshaft, and the combined crankshaft connecting rod with bearing cannot meet the use requirement, therefore urgently needs a split type bearing for big horsepower two stroke internal combustion engine crankshaft. SUMMARY

[0004] The utility model discloses a split type bearing for big horsepower two stroke internal combustion engine crankshaft to solve the problem in the background art.

[0005] In order to solve the above technical problem, the utility model provides the following technical scheme: a split type bearing for big horsepower two stroke internal combustion engine crankshaft, including crankcase, crankshaft, split type needle roller bearing assembly, deep groove ball bearing and needle roller bearing,

[0006] The crankcase is designed with the installation interface matched with the split type needle roller bearing assembly, and the assembly structure integrated with the deep groove ball bearing, the needle roller bearing and the crankshaft;

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

[0008] The deep groove ball bearing is used for supporting the crankshaft and transmitting the radial and certain degree of axial load generated by the crankshaft;

[0009] The split type needle roller bearing assembly includes shell, retainer, needle roller, snap spring and oil gas passage, the shell is designed as detachable, the retainer is divided into two pieces and the needle roller is embedded in it, the snap spring is used for fixing the retainer in the shell, and the oil gas passage is arranged on the shell and is used for receiving the oil gas in the crankcase.

[0010] The crankcase is one of the key components of the internal combustion engine, and the crankcase design has a matching installation interface with the split needle bearing assembly, and an assembly structure integrated with other mechanical components (such as deep groove ball bearings, needle bearings, crankshafts, etc.), and the crankshaft is a key component in the internal combustion engine that converts the reciprocating motion of the piston into rotary motion, the deep groove ball bearing is mainly used to support the crankshaft, due to the compact structure of the deep groove ball bearing, it can withstand larger radial and axial loads, the design of the groove on the inner and outer rings can accommodate multiple steel balls, these steel balls roll between the inner and outer rings, thereby reducing frictional resistance and energy loss, allowing the radial and to some extent axial load generated by the crankshaft to be well transmitted, the needle bearing can ensure the accuracy and stability of the crankshaft during operation, and the roller of the needle bearing is slender, occupying less space, it can provide high load capacity in the radial space, the needle bearing also has high precision and wear resistance, it can adapt to various harsh environments, ensuring the stable operation of the crankshaft during rotation, thereby ensuring the efficient, stable and safe operation of the internal combustion engine.

[0011] Preferably, the shell 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 crankcase through the process of breaking apart.

[0012] Preferably, the retainer is made of lightweight high-strength material to reduce frictional wear, and precise machining is used to ensure the accuracy of the fit between the needle and the retainer.

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

[0014] The needle is a key rolling element in the bearing, and its diameter tolerance requirement is extremely high. The diameter of the needle must fluctuate within a very strict range to ensure accurate fit between the main journal of the crankshaft and the main bearing hole of the crankcase, thereby reducing friction, improving operating efficiency and prolonging bearing life. The needle is made of high-precision, wear-resistant material. The high-precision material ensures the size and shape accuracy of the needle, allowing it to maintain a stable rolling track during operation, reducing vibration and noise. The wear-resistant material prolongs the service life of the needle, reduces performance degradation and risk of failure due to wear, and has excellent mechanical properties and wear resistance, capable of withstanding the large stress and friction generated during operation of the internal combustion engine. The needle supports and transmits the load on the crankshaft in the split bearing, and reduces frictional wear and energy loss through rolling motion.

[0015] Preferably, the clip spring is designed with an elastic locking structure to accommodate retainers and shells of different sizes and ensure structural stability.

[0016] Preferably, the crankcase is internally integrated with lubricating oil and gas circuits.

[0017] Preferably, the oil gas in the crankcase is connected with the oil gas passage on the shell of the split type needle bearing assembly through the one-way valve, forming a complete lubrication cycle to lubricate the needle.

[0018] Compared with the prior art, the utility model has the beneficial effects that:

[0019] The utility model discloses, through design high accuracy's split type needle bearing assembly and oil gas passage, realized the effective lubrication of needle, and the existence of waste gas also helps cooling, improves the heat dissipation performance, split type needle bearing assembly adopts the shell and two piece type's retainer design of the rising cut apart process manufacture, not only improved the precision and strength of bearing assembly and reduced the failure rate of internal combustion engine, improved the overall operation effect of equipment, also facilitated installation and dismounting. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is application structure schematic diagram for split type needle bearing assembly in crankcase;

[0021] Figure 2 It is split type needle bearing assembly structure schematic diagram.

[0022] Among them: 1, the crankcase;2, the crankshaft;3, split type needle bearing assembly;4, deep groove ball bearing;5, needle bearing;31, shell;32, retainer;33, needle;34, circlip;35, oil gas passage. DETAILED DESCRIPTION

[0023] The technical scheme in the embodiments of the utility model will be apparently and completely described below with the drawings in the embodiments of the utility model, and apparently, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skill in the art without creative labor belong to the range of protection of the utility model.

[0024] The utility model provides the following technical scheme:

[0025] Please refer to Figure 1 、 Figure 2 A split type bearing for a large horsepower two-stroke internal combustion engine crankshaft, comprising a crankcase 1, a crankshaft 2, a split type needle bearing assembly 3, a deep groove ball bearing 4 and a needle bearing 5,

[0026] The crankcase 1 is designed with a mounting interface matched with the split type needle bearing assembly 3, and an assembly structure integrated with the deep groove ball bearing 4, the needle bearing 5 and the crankshaft 2;

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

[0028] The deep groove ball bearing 4 is used for supporting the crankshaft 2 and transmitting the radial and certain axial load generated by the crankshaft 2.

[0029] The split needle bearing assembly 3 comprises an outer shell 31, a cage 32, needles 33, a circlip 34 and an oil gas passage 35, the outer shell 31 is designed to be detachable, the cage 32 is split into two pieces and the needles 33 are embedded therein, the circlip 34 is used for fixing the cage 32 in the outer shell 31, and the oil gas passage 35 is arranged on the outer shell 31 and used for receiving the oil gas in the crankcase 1.

[0030] Through the above technical scheme, the crankcase 1 is one of the key components of the internal combustion engine, the crankcase 1 is designed with a mounting interface matched with the split needle bearing assembly 3 and an assembly structure integrated with other mechanical components such as the deep groove ball bearing 4, the needle bearing 5 and the crankshaft 2, the crankshaft 2 is a key component of the internal combustion engine for converting the reciprocating motion of the piston into rotary motion, the deep groove ball bearing 4 is mainly used for supporting the crankshaft 2, due to the compact structure of the deep groove ball bearing 4, the deep groove ball bearing 4 can bear larger radial and axial load, the grooves on the inner and outer rings of the deep groove ball bearing 4 can accommodate a plurality of steel balls, the steel balls roll between the inner and outer rings, thereby reducing the friction resistance and energy loss, so that the radial and certain axial load generated by the crankshaft 2 can be well transmitted, the needle bearing 5 can ensure the precision and stability of the crankshaft during operation, the rollers of the needle bearing 5 are slender and occupy small space, the needle bearing can provide high load capacity in the radial space, the needle bearing also has high precision and wear resistance, can adapt to various harsh environments, and ensure the stable operation of the crankshaft 2 during rotation, thereby ensuring the efficient, stable and safe operation of the internal combustion engine.

[0031] The outer shell 31 is made of high-strength and corrosion-resistant material and is assembled between the main journal of the crankshaft and the main bearing hole of the crankcase through the process of breaking and separating.

[0032] Through the technical scheme, the shell 31 needs to bear the huge stress and load generated when the crankshaft 2 operates, and therefore must have high strength to ensure that it will not be deformed or damaged during use. In addition, the material of the shell 31 must have good corrosion resistance to prolong the service life of the shell 31, because the working environment of the internal combustion engine is usually harsh, involving high temperature, high pressure, grease and corrosive substances. In addition, the shell material should have good processability and thermal stability. The shell 31 is assembled between the main journal of the crankshaft 2 and the main bearing hole of the cylinder block by the split and expansion process. The split and expansion process utilizes the elastic deformation and plastic deformation characteristics of the material, and through the action of external force, the shell is expanded at a specific position, thereby achieving close fit with the main journal of the crankshaft and the main bearing hole of the cylinder block, achieving high assembly precision, good reliability and high assembly efficiency. The shell 31 is assembled between the main journal of the crankshaft and the main bearing hole of the cylinder block, which plays a role in supporting and fixing the crankshaft 2. At the same time, it cooperates with other components of the split needle bearing assembly, such as the retainer 32, the needle 33 and the circlip 34, to jointly ensure the accuracy and stability of the crankshaft 2 during operation.

[0033] The retainer 32 is made of lightweight high-strength material to reduce friction loss and ensure the fit accuracy between the needle 33 and the retainer 32 through precise machining.

[0034] Through the technical scheme, the retainer 32 is made of lightweight high-strength material. The use of lightweight material 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 rotational inertia can be reduced, the acceleration response can be improved, and the retainer must have sufficient strength to support the needle 33 and withstand various stresses during operation while being lightweight. Therefore, the high-strength material ensures the reliability and durability of the retainer 32 under long-time and high-load operation. The retainer 32 is precisely machined to ensure the accuracy of its size and shape, which ensures the fit accuracy between the needle 33 and the retainer 32. The improved fit accuracy between the needle 33 and the retainer 32 can reduce friction loss, improve operating efficiency and prolong bearing life, ensuring the overall performance and stability of the high-power two-stroke internal combustion engine.

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

[0036] By the above technical solution, the needle 33 as a key rolling element in the bearing, its diameter tolerance requirement is extremely high, the diameter of the needle must be in a very strict range of fluctuation, can ensure the accurate fit between the crankshaft main journal and the box main bearing hole, can play to reduce friction, improve the running efficiency and prolong the bearing life, and the needle 33 is made of high-precision, wear-resistant material, wherein the high-precision material ensures the size and shape accuracy of the needle, so that it can maintain a stable rolling track during operation, reduce vibration and noise, and the wear-resistant material prolongs the service life of the needle 33, reduces the performance decline and failure risk caused by wear, so that 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 33 plays a supporting and load transmitting role on the crankshaft 2 in the split bearing, and also reduces friction loss and energy loss through rolling motion.

[0037] The clasp spring 34 is designed with an elastic locking structure to adapt to different sizes of the retainer 32 and the shell 31, and to ensure structural stability.

[0038] By the above technical solution, the elastic locking structure of the clasp spring 34 can adapt to different sizes of the retainer 32 and the shell 31. When the clasp spring 34 is installed in place, the prestressed part in the elastic locking structure will generate a restoring force. This force tightly fixes the clasp spring between the retainer 32 and the shell 31. The generated restoring force not only ensures the fixing effect of the clasp spring 34, but also provides additional stability and reliability. Since there may be slight size differences in the manufacturing and assembly process of the internal combustion engine crankshaft bearing assembly, the elastic locking structure can ensure that the clasp spring 34 is tightly fixed between the retainer 32 and the shell 31 in various situations. 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 clasp spring 34 from loosening or falling off, thereby ensuring the overall stability and safety of the bearing assembly.

[0039] The crankcase 1 is integrated with lubricating oil channels and gas channels inside.

[0040] By the above technical solution, 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 roller bearing assemblies 3, deep groove ball bearings 4 and needle roller bearings 5. The lubricating oil circuit includes oil inlet and outlet ports and oil channels connecting these ports. The oil channels are arranged to ensure that the lubricating oil can be evenly distributed in each part of the bearing assembly. During the operation of the internal combustion engine, the crankshaft bearings will be subjected to great friction and wear. The lubricating oil circuit can effectively reduce friction and wear by spraying or circulating lubricating oil to the bearing assembly, thereby prolonging the service life of the bearings. The air circuit includes an air inlet and an air outlet, both of which are arranged on the crankcase 1 to ensure that air can smoothly enter and exit 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, improve compactness, reduce external connections and pipelines, reduce the risk of leakage and failure, and improve the reliability of the internal combustion engine. It provides an efficient, reliable and compact lubrication and air supply system for high-power two-stroke internal combustion engines.

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

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

[0043] Although the embodiments of the utility model have been shown and described, it is understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A split bearing for crankshaft of high power two-stroke internal combustion engine, comprising a crankcase (1), a crankshaft (2), a split needle bearing assembly (3), a deep groove ball bearing (4) and a needle bearing (5), characterized in that: the crankcase (1) is designed with a mounting interface matched with the split needle bearing assembly (3), and an assembly structure integrated with the deep groove ball bearing (4), the needle bearing (5) and the crankshaft (2); the needle bearing (5) can ensure the precision 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 and certain degree of axial load generated by the crankshaft (2); the split needle bearing assembly (3) comprises a shell (31), a cage (32), a needle (33), a circlip (34) and an oil-gas passage (35), the shell (31) is designed to be detachable, the cage (32) is divided into two pieces and the needle (33) is embedded therein, the circlip (34) is used to fix the cage (32) in the shell (31), and the oil-gas passage (35) is arranged on the shell (31) for receiving oil-gas in the crankcase (1).

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

3. A split bearing for a crankshaft of a high power two-stroke internal combustion engine according to claim 1, characterized in that: The cage (32) is made of lightweight and high-strength material to reduce friction loss, and precise machining is used to ensure the matching precision between the needle (33) and the cage (32).

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

5. A split bearing for a crankshaft of a high power two-stroke internal combustion engine according to claim 1, characterized in that: The circlip (34) is designed with an elastic locking structure to adapt to different sizes of the cage (32) and the shell (31), and to ensure the structural stability.

6. A split bearing for a crankshaft of a large horsepower two-stroke internal combustion engine as defined in claim 1, characterized in that: The crankcase (1) is integrated with lubricating oil circuit and gas circuit inside.

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

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