Crankshaft connecting rod positioning structure and compressor

Abstract

The application relates to the field of mechanical transmission and lubrication, and discloses a crankshaft connecting rod positioning structure and a compressor. The crankshaft connecting rod positioning structure comprises a crankshaft, a connecting rod and a crosshead, the three components are matched to form a motion constraint structure, and the structure is further provided with a crankcase, a flywheel, an oil pump and other components, has a lubricating system, and can adjust an assembly gap and form an axial positioning gap, some components are made of special wear-resistant materials, and the structure further comprises a piston rod assembly connected with the crosshead and the like. The application has the technical effects of optimizing the positioning of the crankshaft connecting rod, realizing good motion constraint, guaranteeing the lubricating effect of the components, facilitating the adjustment of the gap, prolonging the service life of the components, and ensuring the stable operation of the compressor.

Description

Technical Field

[0001] This application relates to the field of mechanical transmission and lubrication, and in particular to a crankshaft connecting rod positioning structure and a compressor. Background Technology

[0002] In the field of mechanical engineering, power transmission and conversion systems have always been a key area of ​​research and development. With continuous industrial progress, higher demands are being placed on the performance, reliability, and efficiency of mechanical equipment. As a core component of many power devices such as engines and compressors, the crankshaft connecting rod mechanism directly affects the overall operation of the equipment. A well-designed crankshaft connecting rod positioning structure ensures smooth power transmission, reduces energy loss, and extends the service life of the equipment. It is widely used in numerous fields such as automobiles, ships, and aerospace, driving technological innovation and development in these industries and continuously improving the performance of various power equipment.

[0003] Traditional crankshaft and connecting rod positioning typically employs conventional methods. For example, simple axial limiting devices, such as a combination of a shaft shoulder and a retaining ring, are used, utilizing the shoulder's blocking effect to restrict the connecting rod's axial movement. This method is simple and direct, and provides a certain degree of positioning. Alternatively, keyed connections are used, where the crankshaft and connecting rod are positioned circumferentially and axially through the engagement of a keyway and key. Furthermore, some designs rely on the positioning function of bearings, using their support and guiding properties to ensure the normal operation of the crankshaft and connecting rod. However, these methods provide positioning relatively independently, lacking a systematic and holistic approach.

[0004] Because the various positioning methods are independent and lack effective coordination, they cannot provide adequate motion constraints on the crankshaft connecting rod during equipment operation. This can easily cause the connecting rod to move or wobble in the axial and circumferential directions, affecting the smoothness of power transmission and potentially leading to increased vibration and noise, thus reducing the equipment's reliability and service life. Summary of the Invention

[0005] In order to provide good motion constraints for the crankshaft connecting rod and ensure smooth power transmission, this application provides a crankshaft connecting rod positioning structure and a compressor.

[0006] On the one hand, this application provides a crankshaft connecting rod positioning structure, which adopts the following technical solution: A crankshaft connecting rod positioning structure, comprising: The crankshaft has outwardly protruding shoulders and inwardly recessed journals; A connecting rod includes a connecting rod body and a connecting rod big end bearing and a connecting rod small end bearing connected to the connecting rod body. The connecting rod big end bearing is fitted onto the journal of the crankshaft. The journal has a crankshaft fillet to form a first axial free clearance and a second axial free clearance between the axial inner sidewall of the journal and the axial outer sidewall of the big end of the connecting rod body. The thickness of the connecting rod big end bearing is less than the thickness of the connecting rod body. Each side of the connecting rod big end bearing forms a third axial free clearance relative to each side of the connecting rod body. The connecting rod body has a connecting rod chamfer at the connection point of the connecting rod big end bearing. The crankshaft fillet, the first axial free clearance, the second axial free clearance, the connecting rod chamfer, and the third axial free clearance cooperate to form a free end. The crosshead includes a crosshead body and a crosshead pin connected to the crosshead body. The connecting rod small end bearing is sleeved on the crosshead pin. The thickness of the connecting rod small end bearing is greater than the thickness of the connecting rod body to form a first axial limiting gap. A second axial limiting gap is provided between the connecting rod small end bearing and the crosshead body. The first axial limiting gap and the second axial limiting gap cooperate to form a limiting end. The free end cooperates with the limiting end to form a motion constraint structure.

[0007] By employing the above technical solution, a motion constraint structure is constructed by setting crankshaft fillets, axial free clearance, and connecting rod chamfers at the big end of the connecting rod, and forming a free end using the thickness difference between the connecting rod big end bearing and the connecting rod body. At the small end of the connecting rod, a limiting end is formed using the thickness difference between the connecting rod small end bearing and the connecting rod body, and the clearance between the connecting rod small end bearing and the crosshead body. This structure allows the connecting rod big end to have axial movement space during crankshaft and connecting rod motion, reducing axial force interference with the crankshaft and preventing excessive wear and jamming between components. Simultaneously, the small end of the connecting rod is effectively axially limited, ensuring precise guidance of the piston's reciprocating motion. Overall, this motion constraint structure ensures smooth power transmission, reduces axial and circumferential movement or oscillation of the connecting rod, improves structural stability and operational reliability, and helps reduce vibration and noise.

[0008] Optionally, the crankshaft connecting rod positioning structure further includes: A crankcase that houses the crankshaft, the connecting rod, and the crosshead; the crankcase is provided with a main sliding bearing mounting seat, on which a main sliding bearing is mounted; and the crankshaft is mounted inside the main sliding bearing. A flywheel is disposed outside the crankcase, and the drive end of the crankshaft extends out of the crankcase and is connected to the flywheel; An oil pump is located outside the crankcase, opposite to the flywheel. The crankshaft has a crankshaft oil pump connecting screw on its remote drive end, and the crankshaft is connected to the oil pump via the crankshaft oil pump connecting screw.

[0009] By adopting the above technical solution, a crankcase is added to provide housing, protection, and support for core moving components such as the crankshaft, connecting rod, and crosshead. The main sliding bearing provides stable support for the crankshaft's rotation, reducing friction. The flywheel helps store and release energy, making the crankshaft rotate more smoothly and ensuring the continuous and stable operation of equipment such as compressors. The oil pump, driven by the crankshaft, provides continuous lubrication to the key friction pairs of the entire positioning structure, ensuring the normal operation and service life of the structure.

[0010] Optionally, the main sliding bearing mounting base is provided with a main sliding bearing locating pin and a mounting base lubrication oil passage, and the main sliding bearing is mounted on the main sliding bearing mounting base through the main sliding bearing locating pin; the main sliding bearing has a main sliding bearing lubrication oil passage inside, and the main sliding bearing lubrication oil passage is connected to the mounting base lubrication oil passage; the crankshaft has a first crankshaft lubrication oil passage and a second crankshaft lubrication oil passage that are interconnected, and the first crankshaft lubrication oil passage is connected to the main sliding bearing lubrication oil passage; the connecting rod big end bearing has a connecting rod big end bearing lubrication oil groove inside, and the connecting rod big end bearing lubrication oil groove is connected to the second crankshaft lubrication oil passage of the crankshaft; the connecting rod body has a connecting rod lubrication oil passage inside, and the connecting rod lubrication oil passage is connected to the connecting rod big end bearing lubrication oil groove; the connecting rod small end bearing has a connecting rod small end bearing lubrication oil groove inside, and the connecting rod small end bearing lubrication oil groove is connected to the connecting rod lubrication oil passage.

[0011] By adopting the above technical solution and setting a locating pin for the main sliding bearing, accurate positioning of the main sliding bearing is ensured. Simultaneously, a complete and continuous lubrication system is constructed. Lubricating oil, after being output from the oil pump, sequentially passes through the mounting seat lubrication passage, the main sliding bearing lubrication passage, the crankshaft internal oil passage, the connecting rod big end bearing lubrication groove, the connecting rod lubrication passage, and finally reaches the connecting rod small end bearing lubrication groove. This design ensures that all critical friction pairs, including the main sliding bearing, crankshaft journal, connecting rod big end bearing, and connecting rod small end bearing, receive sufficient and continuous lubrication and cooling, effectively reducing friction and wear, and significantly improving the structure's working efficiency, reliability, and service life.

[0012] Optionally, an assembly gap is provided between the oil pump output end and the drive shaft end of the crankshaft oil pump connecting screw, and a crankshaft oil pump connecting screw gasket is provided at the connection between the crankshaft oil pump connecting screw and the remote drive end of the crankshaft, wherein the size of the assembly gap is adjusted by adjusting the thickness of the crankshaft oil pump connecting screw gasket.

[0013] By adopting the above technical solution, and by setting an assembly gap between the oil pump and the crankshaft oil pump connecting screw, and adjusting the size of this gap using shims, the installation of the oil pump becomes more convenient, enabling quick insertion and simplifying the assembly process. Simultaneously, this assembly gap provides a certain buffer space for the relative movement between the oil pump and the crankshaft, preventing component damage that might occur due to rigid connections, and improving the assembly flexibility and operational reliability of the oil pump.

[0014] Optionally, the main sliding bearing mounting seat is provided with a crankcase cover, the crankcase cover is provided with a crankcase cover washer and a crankcase cover washer positioning pin for installing the crankcase cover washer, the crankcase cover washer forms an axial positioning gap with the shoulder of the crankshaft by adjusting the thickness, wherein the assembly gap is greater than the axial positioning gap.

[0015] By employing the above technical solution, and by setting a crankcase gland and crankcase gland gasket, and utilizing the axial positioning clearance formed between the gasket and the crankshaft shoulder, precise axial positioning of the entire crankshaft connecting rod positioning structure within the crankcase is achieved, effectively limiting the axial movement of the crankshaft. The crankcase gland gasket locating pin ensures the stability of the gasket installation. Setting the oil pump assembly clearance to be greater than the crankshaft axial positioning clearance further ensures that when the crankshaft experiences axial displacement within its allowable range, no harmful axial force will be generated on the oil pump and its connecting components, thereby protecting the oil pump, extending its service life, and improving the assembly tolerance and operational stability of the entire system.

[0016] Optionally, the crankcase gland gasket includes a first crankcase gland gasket and a second crankcase gland gasket. The first crankcase gland gasket and the second crankcase gland gasket are structurally complementary semi-circular segments. They are joined together to form an annular crankcase gland gasket. The first crankcase gland gasket and the second crankcase gland gasket have chamfers at the jointing positions. The first crankcase gland gasket and the second crankcase gland gasket have lubricating oil passages. The first crankcase gland gasket has a positioning groove, which cooperates with a positioning pin to suppress the slippage of the crankcase gland gasket.

[0017] The above technical solution designs the crankcase gland gasket as two complementary semi-circular ring segments, facilitating installation and disassembly. The chamfered joint design aids in the precise alignment of the two semi-rings. Lubrication channels on the gasket guide lubricating oil to areas requiring lubrication, such as the crankshaft shoulder, further improving lubrication. The engagement of the locating groove and locating pin effectively prevents rotation or slippage of the gasket during operation, ensuring the stability and reliability of the axial positioning clearance.

[0018] Optionally, the first crankcase gland gasket, the second crankcase gland gasket, the connecting rod big end bearing, and the connecting rod small end bearing are made of wear-resistant materials with a hardness lower than that of the crankshaft and the connecting rod.

[0019] By employing the above technical solution, and selecting wear-resistant materials with lower hardness to manufacture vulnerable parts such as crankcase gland gaskets, connecting rod big-end bearings, and connecting rod small-end bearings, wear is preferentially applied to these relatively low-cost parts during wear events, rather than the crankshaft and connecting rod bodies, which have higher hardness and are more expensive to manufacture and replace. This design protects the main components, extends the service life of the crankshaft and connecting rod, reduces equipment maintenance costs, and increases the overall stability and durability of the equipment.

[0020] Optionally, the crankshaft connecting rod positioning structure further includes a piston rod assembly connected to the crosshead body; the crosshead also includes a crosshead pin retainer circlip connecting the crosshead body and the crosshead pin, and a crosshead mounting seat for mounting the crosshead body, wherein the crosshead pin is provided with a retainer circlip groove for mounting the crosshead pin retainer circlip.

[0021] The above technical solution clarifies the specific structure of the crosshead assembly and its connection relationship with the piston rod assembly, making it a key component in the complete motion transmission chain of a reciprocating compressor or similar equipment. The crosshead pin retaining ring is used to axially fix the crosshead pin, preventing it from dislodging during operation and ensuring a reliable connection between the small end of the connecting rod and the crosshead. The crosshead mounting seat provides guidance and support for the reciprocating motion of the crosshead, ensuring the smoothness and accuracy of the movement.

[0022] Optionally, the connecting rod big end bearing is installed on the big end of the connecting rod body by a connecting rod big end bearing fixing pin, and the connecting rod small end bearing is connected to the small end of the connecting rod body by a connecting rod small end bearing locking screw.

[0023] By employing the above technical solution, the connecting rod big-end bearing fixing pin and connecting rod small-end bearing locking screw are used to reliably fix and precisely position the connecting rod big-end bearing and connecting rod small-end bearing on the connecting rod body, respectively. This connection method ensures a tight fit between the bearing and the connecting rod body, preventing relative rotation or loosening during operation, ensuring the accuracy of motion transmission and structural stability, and also facilitating the assembly and replacement of the bearing.

[0024] On the other hand, this application also provides a compressor having the aforementioned crankshaft connecting rod positioning structure.

[0025] By adopting the above technical solution and applying the crankshaft connecting rod positioning structure to the compressor, the compressor can improve the smoothness of power transmission, reduce the movement and sway of moving parts, ensure sufficient lubrication of key components, reduce friction and wear, extend the service life of the compressor and its core components, improve the convenience of assembly and the reliability and stability of operation, and reduce vibration and noise.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. A motion constraint structure is constructed by incorporating crankshaft fillets, axial free clearance, and connecting rod chamfers at the big end of the connecting rod, and by utilizing the thickness difference between the big end bearing and the connecting rod body to form a free end. A limiting end is formed at the small end of the connecting rod using the thickness difference between the small end bearing and the connecting rod body, and the clearance between the small end bearing and the crosshead body. This structure allows the connecting rod big end to have axial movement space during crankshaft and connecting rod motion, reducing axial force interference with the crankshaft and preventing excessive wear and jamming between components. Simultaneously, the small end of the connecting rod is effectively axially limited, ensuring precise guidance of the piston's reciprocating motion. Overall, this motion constraint structure ensures smooth power transmission, reduces axial and circumferential movement or wobbling of the connecting rod, improves structural stability and operational reliability, and helps reduce vibration and noise.

[0027] 2. By setting an assembly gap between the oil pump and the crankshaft oil pump connecting screw, and adjusting the size of this gap using shims, the installation of the oil pump becomes more convenient, enabling quick insertion and simplifying the assembly process. Simultaneously, this assembly gap provides a buffer space for the relative movement between the oil pump and the crankshaft, preventing component damage that might occur due to a rigid connection, thus improving the assembly flexibility and operational reliability of the oil pump.

[0028] 3. By setting the crankcase gland and crankcase gland gasket, and utilizing the axial positioning clearance formed between the gasket and the crankshaft shoulder, precise axial positioning of the entire crankshaft connecting rod positioning structure within the crankcase is achieved, effectively limiting the axial movement of the crankshaft. The crankcase gland gasket locating pin ensures the stability of the gasket installation. Setting the oil pump assembly clearance to be greater than the crankshaft axial positioning clearance further ensures that no harmful axial force is generated on the oil pump and its connecting components when the crankshaft experiences axial displacement within the allowable range, thereby protecting the oil pump, extending its service life, and improving the assembly tolerance and operational stability of the entire system. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the crankshaft connecting rod positioning structure according to an embodiment of this application; Figure 2 yes Figure 1 Enlarged view of region A in the middle; Figure 3 This is a schematic diagram of the main sliding bearing mounting seat and crankcase cover according to an embodiment of this application; Figure 4 This is a schematic diagram of the crankcase gland gasket ring according to an embodiment of this application; Figure 5 yes Figure 1 Enlarged view of region B in the middle; Figure 6 This is a schematic diagram of the connecting rod structure according to an embodiment of this application.

[0030] Explanation of reference numerals in the attached drawings: 10, flywheel; 20, crankcase; 21, main sliding bearing mounting seat; 21a, mounting seat lubrication passage; 22, crankcase gland; 23, crankcase gland washer locating pin; 30, main sliding bearing; 31, main sliding bearing lubrication passage; 32, crankcase gland washer; 32a, first crankcase gland washer; 32b, second crankcase gland washer; 32c, butt chamfer; 32d, washer lubrication passage; 32e, locating groove; 33, axial positioning clearance; 40, crankshaft; 41, drive end; 42, remote drive end; 43, shoulder; 44, journal; 44a, crankshaft fillet; 45, first crankshaft lubrication passage; 46, second crankshaft lubrication passage; 47, first axial free clearance; 4 8. Second axial free clearance; 51. Oil pump; 52. Crankshaft oil pump connecting screw; 53. Assembly clearance; 54. Crankshaft oil pump connecting screw gasket; 60. Connecting rod; 61. Connecting rod body; 61a. Connecting rod chamfer; 61b. Connecting rod lubrication passage; 62. Connecting rod big end bearing; 62a. Connecting rod big end bearing lubrication groove; 63. Connecting rod small end bearing; 63a. Connecting rod small end bearing lubrication groove; 64. Connecting rod big end bearing fixing pin; 65. Third axial free clearance; 66. Connecting rod small end bearing locking screw; 67. First axial limiting clearance; 70. Crosshead; 71. Crosshead body; 72. Crosshead pin; 73. Crosshead pin retaining ring; 74. Crosshead mounting seat; 75. Second axial limiting clearance; 80. Piston rod assembly. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1 —6 provides further detailed description of this application.

[0032] This application discloses a crankshaft connecting rod positioning structure.

[0033] Figure 1 This is a schematic diagram of the crankshaft connecting rod positioning structure according to an embodiment of this application. (Refer to...) Figure 1The crankshaft connecting rod positioning structure includes a flywheel 10, a crankcase 20, a main sliding bearing 30, a crankshaft 40, an oil pump 51, a connecting rod 60, a crosshead 70, and a piston rod assembly 80. The crankshaft 40, the connecting rod 60, and the crosshead 70 cooperate to form a motion constraint structure, providing good motion constraint for the crankshaft connecting rod positioning and preventing the connecting rod 60 from axially or circumferentially moving or wobbling, thus improving the smoothness of power transmission. This is because the clearances and structures between the components are rationally designed to ensure mutual constraint during movement.

[0034] The flywheel 10 is located below the crankcase 20 and connected to the crankshaft 40. The flywheel 10 is a disc-shaped component with significant inertia; it stores energy, making the rotation of the crankshaft 40 smoother. During compressor operation, when the piston rod assembly 80 performs work, the flywheel 10 absorbs and stores energy; when the piston rod assembly 80 is in the intake, compression, or exhaust strokes, the flywheel 10 releases the stored energy, driving the crankshaft 40 to continue rotating, ensuring continuous compressor operation.

[0035] The crankcase 20 houses the crankshaft 40, connecting rod 60, and crosshead 70, serving to protect and support the internal components. The crankcase 20 is generally a closed housing structure, made of materials such as cast iron or aluminum alloy, possessing good strength and rigidity. The crankcase 20 contains a main sliding bearing mounting seat 21, which mounts the main sliding bearing 30. The main sliding bearing 30 provides support and lubrication for the rotation of the crankshaft 40, reducing frictional resistance during crankshaft rotation. The number of main sliding bearing mounting seats 21 can be one or more; preferably, two coaxially arranged main sliding bearing mounting seats 21 can be provided.

[0036] Figure 2 yes Figure 1 A magnified view of region A in the middle. (Refer to...) Figure 1 and Figure 2 The main sliding bearing mounting base 21 is provided with a main sliding bearing locating pin and a mounting base lubrication oil passage 21a. The mounting base lubrication oil passage 21a is used to transport lubricating oil to provide lubrication and cooling for the main sliding bearing 30. The main sliding bearing 30 is mounted on the main sliding bearing mounting base 21 by the main sliding bearing locating pin, and the main sliding bearing 30 and the main sliding bearing mounting base 21 are coaxially arranged. The surface of the main sliding bearing 30 is provided with a wear-resistant coating, and the main sliding bearing 30 has a main sliding bearing lubrication oil passage 31 inside.

[0037] The end of the crankshaft 40 is disposed within the main sliding bearing 30, and the drive end 41 of the crankshaft 40 extends out of the crankcase 20 and connects to the flywheel 10. A crankshaft oil pump connecting screw 52 is provided on the remote drive end 42 of the crankshaft 40, and the remote drive end 42 of the crankshaft 40 is connected to the oil pump 51 via the crankshaft oil pump connecting screw 52. An assembly gap 53 is provided between the output end of the oil pump 51 and the drive shaft end of the crankshaft oil pump connecting screw 52, ​​and the assembly gap 53 can be 0.5-4.5 mm. The assembly gap 53 facilitates quick insertion of the output end of the oil pump 51, simplifying the assembly process. The function of the oil pump 51 is to provide lubricating oil to the entire system, ensuring normal lubrication and cooling of all components. Through the crankshaft oil pump connecting screw 52, ​​the oil pump 51 can rotate synchronously with the crankshaft 40, realizing the cyclic supply of lubricating oil.

[0038] Reference Figure 2 Furthermore, a crankshaft oil pump connecting screw 52 may be provided at the connection point between the crankshaft oil pump connecting screw 52 and the remote drive end 42 of the crankshaft 40. The assembly clearance 53 can be adjusted by adjusting the thickness of the crankshaft oil pump connecting screw 54. The assembly clearance 53 can be adjusted by adjusting the thickness of the crankshaft oil pump connecting screw 54, making the assembly clearance 53 larger than the axial positioning clearance 33. The presence of the assembly clearance 53 provides a certain buffer space for the relative movement between the oil pump 51 and the crankshaft 40, avoiding damage caused by rigid connection.

[0039] The main sliding bearing 30 is provided with a crankcase cover washer 32 near the shoulder 43 of the crankshaft 40. An axial positioning gap 33 is provided between the washer surface of the crankcase cover washer 32 and the shoulder 43 of the crankshaft 40, preferably 0.1-1.0 mm. The axial positioning gap 33 is used to limit the axial movement of the crankshaft connecting rod positioning structure within the crankcase 20, and the crankshaft 40 can be effectively axially positioned through the axial positioning gap 33.

[0040] Figure 3 This is a schematic diagram of the main sliding bearing mounting seat and crankcase cover according to an embodiment of this application. Figure 4 This is a schematic diagram of the crankcase gland gasket ring according to an embodiment of this application. (Refer to...) Figure 3 and Figure 4The main sliding bearing mounting seat 21 is provided with a crankcase cover 22, and the crankcase cover 22 is provided with a crankcase cover gasket locating pin 23. One end of the crankcase cover gasket locating pin 23 passes through the crankcase cover gasket 32 ​​and is inserted into the crankcase cover 22 for positioning and installing the crankcase cover gasket 32. The crankcase cover gasket 32 ​​includes a first crankcase cover gasket 32a and a second crankcase cover gasket 32b, wherein the first crankcase cover gasket 32a and the second crankcase cover gasket 32b are semi-circular ring segments with complementary structures. By connecting the first crankcase cover gasket 32a and the second crankcase cover gasket 32b, they can together form a complete circular crankcase cover gasket 32. The first crankcase gland gasket 32a and the second crankcase gland gasket 32b are provided with a chamfer 32c at the docking position. The first crankcase gland gasket 32a and the second crankcase gland gasket 32b are provided with a gasket lubrication oil passage 32d, and the first crankcase gland gasket 32a is provided with a positioning groove 32e. The positioning groove 32e cooperates with the crankcase gland gasket positioning pin 23 to suppress the sliding of the crankcase gland gasket 32.

[0041] The first crankcase gland gasket 32a and the second crankcase gland gasket 32b can be made of wear-resistant materials with a hardness lower than that of the crankshaft 40 and the connecting rod 60, thereby extending the service life of the crankshaft and connecting rod positioning structure and increasing the stability of the equipment.

[0042] Figure 5 yes Figure 1 A magnified view of region B in the middle. Figure 6 This is a schematic diagram of the connecting rod according to an embodiment of this application. (Refer to...) Figure 2 and Figure 5 The crankshaft 40 has an outwardly protruding shoulder 43 and an inwardly recessed journal 44. The shoulder 43 may be an annular protrusion, which serves to axially limit the components it mates with. The journal 44 is the part on the crankshaft 40 used to install other components, and may be a cylindrical recessed structure. The crankshaft 40 has a first crankshaft lubrication oil passage 45 and a second crankshaft lubrication oil passage 46. The first crankshaft lubrication oil passage 45 communicates with the main sliding bearing lubrication oil passage 31 and the second crankshaft lubrication oil passage 46, and the second crankshaft lubrication oil passage 46 communicates with the interior of the connecting rod 60.

[0043] Reference Figure 5 and Figure 6The connecting rod 60 includes a connecting rod body 61, a connecting rod large end bearing 62, and a connecting rod small end bearing 63. The connecting rod body 61 is the main load-bearing and transmission part of the connecting rod 60, and is typically a rod-shaped structure. Its shape and size are designed according to specific application scenarios. The connecting rod large end bearing 62 is fitted onto the journal 44, and the journal 44 and the connecting rod large end bearing 62 have a rotatable fit to achieve power transmission. The journal 44 has a crankshaft fillet 44a to form a first axial free clearance 47 and a second axial free clearance 48 between the axial inner wall of the journal 44 and the axial outer wall of the large end of the connecting rod body 61. The first axial free clearance 47 and the second axial free clearance 48 are preferably 2-8 mm. The first axial free clearance 47 and the second axial free clearance 48 provide a certain amount of axial movement space for the connecting rod 60 while preventing excessive movement of the connecting rod 60.

[0044] The connecting rod big end bearing 62 can be mounted and fixed to the big end of the connecting rod body 61 by a connecting rod big end bearing fixing pin 64. The thickness of the connecting rod big end bearing 62 is less than the thickness of the big end of the connecting rod body 61, wherein each side of the connecting rod big end bearing 62 has a third axial free clearance 65 relative to each side of the connecting rod body 61, and the third axial free clearance 65 is preferably 3-8mm. The connecting rod body 61 has connecting rod chamfers 61a on both sides of the mounting position of the connecting rod big end bearing 62. The crankshaft fillet 44a, the first axial free clearance 47, the second axial free clearance 48, the connecting rod chamfer 61a and the third axial free clearance 65 cooperate to form the free end of the crankshaft connecting rod positioning structure. This free end allows the connecting rod 60 to have appropriate range of motion within a certain range, while not deviating from the normal motion trajectory.

[0045] The connecting rod small end bearing 63 can be connected and fixed to the small end of the connecting rod body 61 by the connecting rod small end bearing locking screw 66. The thickness of the connecting rod small end bearing 63 is greater than the thickness of the connecting rod body 61, and each side of the connecting rod small end bearing 63 has a first axial limiting gap 67 relative to each side of the connecting rod body 61, wherein the first axial limiting gap 67 is preferably 0.5-2mm.

[0046] The connecting rod big end bearing 62 has a connecting rod big end bearing lubrication groove 62a inside, which communicates with the second crankshaft lubrication passage 46 of the crankshaft 40. The connecting rod body 61 has a connecting rod lubrication passage 61b inside, which communicates with the connecting rod big end bearing lubrication groove 62a. The connecting rod small end bearing 63 has a connecting rod small end bearing lubrication groove 63a inside, which communicates with the connecting rod lubrication passage 61b.

[0047] After being output from the oil pump 51, the lubricating oil first enters the lubrication oil passage 21a of the mounting base, and then enters the first crankshaft lubrication oil passage 45 through the main sliding bearing lubrication oil passage 31. The lubricating oil then flows through the second crankshaft lubrication oil passage 46 into the connecting rod big end bearing lubrication oil groove 62a, and then through the connecting rod lubrication oil passage 61b to the connecting rod small end bearing lubrication oil groove 63a, thus achieving lubrication of various critical components. This continuous lubrication channel design ensures that all components receive sufficient lubrication during equipment operation, reducing friction and wear, and improving the equipment's working efficiency and reliability.

[0048] The connecting rod big end bearing 62 and connecting rod small end bearing 63 can be made of wear-resistant materials with a hardness lower than that of the crankshaft connecting rod, thereby extending the service life of the crankshaft connecting rod and increasing the stability of the equipment.

[0049] Reference Figure 1 and Figure 5 The crankshaft 40 is connected to the crosshead 70 via the connecting rod 60. The crosshead 70 includes a crosshead body 71, a crosshead pin 72, a crosshead pin retainer 73, and a crosshead mounting seat 74. The connecting rod small end bearing 63 is sleeved on the crosshead pin 72, and the two are rotatably fitted together. The crosshead pin 72 is connected to the crosshead body 71, and both ends of the crosshead pin 72 are provided with retainer grooves to install the crosshead pin retainer 73. The crosshead body 71 is disposed on the crosshead mounting seat 74, and the crosshead body 71 is connected to the piston rod assembly 80. There is a second axial limiting gap 75 between the two ends of the connecting rod small end bearing 63 and the axial inner wall of the crosshead body 71. The second axial limiting gap 75 is preferably 0.1-1mm. The first axial limiting gap 67 and the second axial limiting gap 75 cooperate to form a limiting end, which can effectively limit the axial movement of the connecting rod 60 and prevent excessive movement of the crankshaft connecting rod positioning structure. The free end and the limiting end work together to form a motion constraint structure, allowing the crankshaft connecting rod positioning structure to have a certain degree of flexibility during movement while being effectively constrained within a specified range of motion. This design, combining the free end and the limiting end, is more scientific and effective than the traditional single positioning method, greatly improving the stability and reliability of the crankshaft connecting rod positioning structure's motion.

[0050] The implementation principle of the crankshaft connecting rod positioning structure in this application embodiment is as follows: A crankshaft fillet 44a, a first axial free clearance 47, a second axial free clearance 48, a connecting rod chamfer 61a are provided at the large end of the connecting rod 60, and a free end is formed by utilizing the thickness difference between the connecting rod large end bearing 62 and the connecting rod body 61. At the small end of the connecting rod 60, a limiting end is formed by utilizing the thickness difference between the connecting rod small end bearing 63 and the connecting rod body 61, and the gap between the connecting rod small end bearing 63 and the crosshead body 71. Together, these constitute a motion constraint structure. This structure allows the large end of the connecting rod 60 to have axial movement space during movement, reducing interference of axial forces on the crankshaft 40 and avoiding excessive wear and jamming between components. Simultaneously, the small end of the connecting rod 60 is effectively axially limited, ensuring precise guidance of the piston reciprocating motion. Overall, this motion constraint structure ensures smooth power transmission, reduces the axial and circumferential movement or swaying of the connecting rod 60, improves the stability and operational reliability of the structure, and helps reduce vibration and noise.

[0051] This application also discloses a compressor having the crankshaft connecting rod positioning structure described in the above embodiments.

[0052] The implementation principle of a compressor according to an embodiment of this application is as follows: During operation, the compressor employs an advanced crankshaft connecting rod positioning structure, which effectively constrains the movement of the crankshaft connecting rod, reducing the axial movement and oscillation of the connecting rod 60 and improving the smoothness of power transmission. Simultaneously, a sophisticated lubrication system ensures good lubrication of all components, reducing friction and wear and extending the compressor's service life. Furthermore, the fine adjustment of the assembly clearance 53 and axial positioning clearance 33, as well as the rational design of the crankcase gland gasket 32, further enhances the compressor's reliability and stability.

[0053] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A crankshaft connecting rod positioning structure, characterized in that, include: The crankshaft (40) has an outwardly protruding shoulder (43) and an inwardly recessed journal (44); The connecting rod (60) includes a connecting rod body (61) and a connecting rod big end bearing (62) and a connecting rod small end bearing (63) connected to the connecting rod body (61). The connecting rod big end bearing (62) is sleeved on the journal (44) of the crankshaft (40). The journal (44) is provided with a crankshaft fillet (44a) so that a first axial free clearance (47) and a second axial free clearance (48) are formed between the axial inner sidewall of the journal (44) and the axial outer sidewall of the big end of the connecting rod body (61). The connecting rod big end bearing (62) The thickness is less than the thickness of the connecting rod body (61). Each side of the connecting rod big end bearing (62) forms a third axial free clearance (65) relative to each side of the connecting rod body (61). The connecting rod body (61) is provided with a connecting rod chamfer (61a) at the connection of the connecting rod big end bearing (62). The crankshaft fillet (44a), the first axial free clearance (47), the second axial free clearance (48), the connecting rod chamfer (61a) and the third axial free clearance (65) cooperate to form a free end. The crosshead (70) includes a crosshead body (71) and a crosshead pin (72) connected to the crosshead body (71). The connecting rod small end plate (63) is sleeved on the crosshead pin (72). The thickness of the connecting rod small end plate (63) is greater than the thickness of the connecting rod body (61) to form a first axial limiting gap (67). A second axial limiting gap (75) is provided between the connecting rod small end plate (63) and the crosshead body (71). The first axial limiting gap (67) and the second axial limiting gap (75) cooperate to form a limiting end. The free end cooperates with the limiting end to form a motion constraint structure.

2. The crankshaft connecting rod positioning structure according to claim 1, characterized in that, Also includes: A crankcase (20) accommodates the crankshaft (40), the connecting rod (60), and the crosshead (70). The crankcase (20) is provided with a main sliding bearing mounting seat (21), on which a main sliding bearing (30) is mounted. The crankshaft (40) is installed inside the main sliding bearing (30). A flywheel (10) is disposed outside the crankcase (20), and the drive end (41) of the crankshaft (40) extends out of the crankcase (20) and is connected to the flywheel (10); An oil pump (51) is located outside the crankcase (20) opposite to the flywheel (10). A crankshaft oil pump connecting screw (52) is provided on the remote drive end (42) of the crankshaft (40). The remote drive end (42) of the crankshaft (40) is connected to the oil pump (51) through the crankshaft oil pump connecting screw (52).

3. The crankshaft connecting rod positioning structure according to claim 2, characterized in that, The main sliding bearing mounting base (21) is provided with a main sliding bearing locating pin and a mounting base lubrication oil passage (21a). The main sliding bearing (30) is mounted on the main sliding bearing mounting base (21) through the main sliding bearing locating pin. A main sliding bearing lubrication oil passage (31) is provided inside the main sliding bearing (30), and the main sliding bearing lubrication oil passage (31) is connected to the mounting base lubrication oil passage (21a). A first crankshaft lubrication oil passage (45) and a second crankshaft lubrication oil passage (46) are provided inside the crankshaft (40), and the first crankshaft lubrication oil passage (45) is connected to the main sliding bearing mounting base (21a). The bearing lubrication passage (31) is connected; the connecting rod big end bearing (62) is provided with a connecting rod big end bearing lubrication groove (62a) inside, and the connecting rod big end bearing lubrication groove (62a) is connected with the second crankshaft lubrication passage (46) of the crankshaft (40); the connecting rod body (61) is provided with a connecting rod lubrication passage (61b) inside, and the connecting rod lubrication passage (61b) is connected with the connecting rod big end bearing lubrication groove (62a); the connecting rod small end bearing (63) is provided with a connecting rod small end bearing lubrication groove (63a) inside, and the connecting rod small end bearing lubrication groove (63a) is connected with the connecting rod lubrication passage (61b).

4. The crankshaft connecting rod positioning structure according to claim 2, characterized in that, An assembly gap (53) is provided between the output end of the oil pump (51) and the drive shaft end of the crankshaft oil pump connecting screw (52). A crankshaft oil pump connecting screw gasket (54) is provided at the connection between the crankshaft oil pump connecting screw (52) and the remote drive end (42) of the crankshaft (40). The size of the assembly gap (53) is adjusted by adjusting the thickness of the crankshaft oil pump connecting screw gasket (54).

5. The crankshaft connecting rod positioning structure according to claim 4, characterized in that, The main sliding bearing mounting seat (21) is provided with a crankcase cover (22), and the crankcase cover (22) is provided with a crankcase cover washer (32) and a crankcase cover washer positioning pin (23) for installing the crankcase cover washer (32). The crankcase cover washer (32) forms an axial positioning gap (33) with the shoulder (43) of the crankshaft (40) by adjusting its thickness, wherein the assembly gap (53) is greater than the axial positioning gap (33).

6. The crankshaft connecting rod positioning structure according to claim 5, characterized in that, The crankcase gland gasket (32) includes a first crankcase gland gasket (32a) and a second crankcase gland gasket (32b). The first crankcase gland gasket (32a) and the second crankcase gland gasket (32b) are structurally complementary semi-circular segments. The first crankcase gland gasket (32a) and the second crankcase gland gasket (32b) are joined together to form an annular crankcase gland gasket (32). The first crankcase gland gasket (32a) and the second crankcase gland gasket (32b) The two crankcase gland gaskets (32b) have a chamfer (32c) at the mating position. The first crankcase gland gasket (32a) and the second crankcase gland gasket (32b) are provided with a gasket lubrication oil passage (32d). The first crankcase gland gasket (32a) is provided with a positioning groove (32e). The positioning groove (32e) cooperates with the crankcase gland gasket positioning pin (23) to suppress the sliding of the crankcase gland gasket (32).

7. The crankshaft connecting rod positioning structure according to claim 6, characterized in that, The first crankcase gland gasket (32a), the second crankcase gland gasket (32b), the connecting rod big end bearing (62), and the connecting rod small end bearing (63) are made of wear-resistant materials with a hardness lower than that of the crankshaft (40) and the connecting rod (60).

8. The crankshaft connecting rod positioning structure according to claim 1, characterized in that, It also includes a piston rod assembly (80) connected to the crosshead body (71); the crosshead (70) also includes a crosshead pin retainer (73) connecting the crosshead body (71) and the crosshead pin (72) and a crosshead mounting seat (74) for mounting the crosshead body (71), wherein the crosshead pin (72) is provided with a retainer groove for mounting the crosshead pin retainer (73).

9. The crankshaft connecting rod positioning structure according to claim 1, characterized in that, The connecting rod big end bearing (62) is installed on the big end of the connecting rod body (61) by the connecting rod big end bearing fixing pin (64), and the connecting rod small end bearing (63) is connected to the small end of the connecting rod body (61) by the connecting rod small end bearing locking screw (66).

10. A compressor, characterized in that, It has a crankshaft connecting rod positioning structure as described in any one of claims 1-9.

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