Low-crack engine crankshaft

Abstract

The utility model relates to the technical field of crankshafts, and discloses a low-crack engine crankshaft which comprises a crank arm and further comprises a connecting rod journal arranged on one side of the crank arm, and a balance block is arranged on one side of the connecting rod journal. The reinforcing mechanism is arranged in the connecting rod journal and comprises a first welding point and a second welding point which are arranged on the outer side of the connecting rod journal, a wear-resisting layer is arranged on the inner wall of the connecting rod journal, an oil storage cavity is formed in the wear-resisting layer, a plurality of supports are fixed to the inner wall of the oil storage cavity, and reinforcing ribs are fixed to the inner sides of the supports; by arranging the reinforcing mechanism, the connecting rod journal is in threaded connection with the crank arm and the balance block, after the connecting rod journal is fixedly connected with the crank arm and the balance block, welding treatment is conducted on the connecting position, meanwhile, the supports and the reinforcing ribs are fixed in the connecting rod journal, the stability of the whole structure of the connecting rod journal is improved, cracks at transition fillets are avoided, and the service life of the connecting rod journal is prolonged. And the crankshaft is prevented from being broken.

Description

Technical Field

[0001] The utility model relates to the technical field of crankshafts, in particular to a low-crack engine crankshaft. Background Art

[0002] The engine crankshaft is an important component in the automobile engine. It and the piston connecting rod group together constitute the engine's crank-connecting rod mechanism. The main function of the crankshaft is to convert the linear power generated by the reciprocating motion of the piston into rotational power, thereby driving the transmission system and other accessories of the car. The crankshaft is usually made of high-strength steel or cast iron. Its structural design and manufacturing quality have an important impact on the power performance, economic performance and reliability of the engine. The design of the crankshaft needs to consider many factors, including strength, stiffness, moment of inertia, mass and balance. In general, the engine crankshaft is one of the key components for engine energy conversion, which is crucial to ensuring the normal operation of the engine and the performance of the entire vehicle.

[0003] When the crankshaft is in use, the connecting rod journal of the crankshaft is connected to the piston connecting rod, and the up and down movement of the piston connecting rod is converted into the rotation of the main shaft. When the crankshaft rotates, the up and down movement of the piston connecting rod is converted into the rotational movement of the main shaft. Therefore, under the action of gravity of the connecting rod and the crankshaft arm, the rotation speed of the crankshaft is easily unstable, which is prone to oscillation, accelerates the damage of the crankshaft, and the transmitted power is unstable. During use, the stress of the piston connecting rod or other accessories will be concentrated at the transition radius between the crank and the journal, which will easily cause cracks in the crankshaft at the transition radius, reducing the service life. Utility Model Content

[0004] The utility model aims to provide a low-crack engine crankshaft to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the utility model provides the following technical solution: a low-crack engine crankshaft, comprising a crank arm, and further comprising:

[0006] A connecting rod journal is arranged on one side of the crank arm, and a balancing block is arranged on one side of the connecting rod journal;

[0007] A reinforcement mechanism is arranged inside the connecting rod journal to improve its toughness, the reinforcement mechanism includes a first welding point and a second welding point respectively arranged on the outside of the connecting rod journal, the first welding point is fixed to one side of the crank arm, and the second welding point is fixed to one side of the balance block, the inner wall of the connecting rod journal is provided with a wear-resistant layer, an oil storage cavity is opened inside the wear-resistant layer, a plurality of brackets are fixed to the inner wall of the oil storage cavity, and reinforcing ribs are fixed to the inner side of the bracket.

[0008] Preferably, the inner walls of the crank arm and the balance block are provided with threaded holes, and both ends of the connecting rod journal are provided with external threads, and the external threads are threadedly connected to the inner walls of the threaded holes.

[0009] Preferably, a main journal is provided on one side of the crank arm, a first oil hole is opened on the inner wall of the main journal, and a second oil hole is opened on the inner wall of the connecting rod journal.

[0010] Preferably, a bearing is rotatably connected to the outer side of the main journal, and a housing is fixed to the outer side of the bearing.

[0011] Preferably, a sealing plug is provided at one end of the main journal, a screw is fixed to one side of the sealing plug, a sealing hole is opened on the inner wall of the main journal, and the screw is threadedly connected to the inner wall of the sealing hole.

[0012] Preferably, a sealing groove is formed on the inner wall of the sealing hole, a sealing ring is fixed on one side of the screw, and the sealing ring is clamped on the inner wall of the sealing groove.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0014] The utility model provides a reinforcing mechanism to threadably connect the connecting rod journal, the crank arm and the balancing block. After the connection is fixed, the connection between the connecting rod journal, the crank arm and the balancing block is welded. At the same time, a plurality of brackets and reinforcing ribs are fixed in the connecting rod journal, thereby improving the stability of the overall structure of the connecting rod journal, thereby improving the stability of its operation during work, avoiding the generation of cracks at the transition fillet, and preventing the crankshaft from breaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A structural schematic diagram of a preferred embodiment of a low-crack engine crankshaft provided by the utility model;

[0016] Figure 2 A schematic diagram of the structure of the crank arm, connecting rod journal and balance block provided by the utility model;

[0017] Figure 3 A structural schematic diagram of the reinforcement mechanism provided by the utility model;

[0018] Figure 4 A schematic diagram of the structure of the main shaft journal provided by the utility model;

[0019] Figure 5 for Figure 4 Schematic diagram of the structure enlarged at point A in the middle.

[0020] In the figure: 1. crank arm; 2. connecting rod journal; 3. balancing block; 4. reinforcement mechanism; 41. first welding point; 42. second welding point; 43. wear-resistant layer; 44. oil storage chamber; 45. bracket; 46. reinforcing rib; 47. threaded hole; 48. external thread; 5. main journal; 6. first oil hole; 7. bearing; 8. chassis; 9. sealing plug; 10. screw; 11. sealing hole; 12. sealing groove; 13. sealing ring; 14. second oil hole. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-5 As shown, a low-crack engine crankshaft includes a crank arm 1, by which a main journal 5 and a connecting rod journal 2 can be connected; it also includes a connecting rod journal 2 arranged on one side of the crank arm 1, by which the crank arm 1 and a balancing block 3 can be connected; a balancing block 3 is arranged on one side of the connecting rod journal 2, by which the stability of the crankshaft rotation can be improved; a reinforcement mechanism 4 is arranged inside the connecting rod journal 2 to improve its toughness, by which the connecting rod journal 2 can be reinforced to improve the stability of its connection with the crank arm 1 and the balancing block 3, and avoid cracks; the reinforcement mechanism 4 includes a first welding point 41 and a second welding point 42 respectively arranged on the outside of the connecting rod journal 2, the first welding point 41 is fixed to one side of the crank arm 1, and the second welding point 42 is fixed to one side of the crank arm 1. It is fixed on one side of the balancing block 3, and by setting a first welding point 41, the connection between the crank arm 1 and the connecting rod journal 2 can be welded and fixed after being connected, and by setting a second welding point 42, the connection between the balancing block 3 and the connecting rod journal 2 can be welded and fixed after being connected; a wear-resistant layer 43 is provided on the inner wall of the connecting rod journal 2, and the wear-resistant effect of the connecting rod journal 2 can be improved by providing the wear-resistant layer 43; an oil storage chamber 44 is provided inside the wear-resistant layer 43, and lubricating oil can be stored by providing the oil storage chamber 44 to improve the lubrication effect and thereby increase the rotation effect during operation; a plurality of brackets 45 are fixed to the inner wall of the oil storage chamber 44, and reinforcing ribs 46 can be fixed by providing the brackets 45; reinforcing ribs 46 are fixed on the inner side of the brackets 45, and the stability of the overall structure of the connecting rod journal 2 can be improved by providing the reinforcing ribs 46.

[0023] See also Figure 2As shown, the inner walls of the crank arm 1 and the balancing block 3 are provided with threaded holes 47, and both ends of the connecting rod journal 2 are provided with external threads 48, and the external threads 48 are threadedly connected to the inner walls of the threaded holes 47. By setting the threaded holes 47 and the external threads 48, the crank arm 1, the balancing block 3 and the connecting rod journal 2 can be facilitated, making the foundation before welding more stable.

[0024] See also Figure 1 , Figure 4 and Figure 5 As shown, a main journal 5 is provided on one side of the crank arm 1, and the crank arm 1 can be connected by providing the main journal 5; a first oil hole 6 is provided on the inner wall of the main journal 5, and lubricating oil can be easily poured into the main journal 5 by providing the first oil hole 6, thereby improving the lubrication effect; a second oil hole 14 is provided on the inner wall of the connecting rod journal 2, and lubricating oil can be easily poured into the connecting rod journal 2 by providing the second oil hole 14, thereby improving the lubrication effect; a bearing 7 is rotatably connected to the outer side of the main journal 5, and the stability of the rotation of the main journal 5 can be improved by providing the bearing 7; a chassis 8 is fixed on the outer side of the bearing 7, and a shaft can be placed by providing the main journal 5 Bearing 7; a sealing plug 9 is provided at one end of the main shaft neck 5, and the sealing plug 9 can be used to seal one end of the main shaft neck 5; a screw 10 is fixed on one side of the sealing plug 9, and a sealing hole 11 is provided on the inner wall of the main shaft neck 5, and the screw 10 is threadedly connected to the inner wall of the sealing hole 11, and the screw 10 and the sealing hole 11 can facilitate the connection between the sealing plug 9 and the main shaft neck 5; a sealing groove 12 is provided on the inner wall of the sealing hole 11, and a sealing ring 13 is fixed on one side of the screw 10, and the sealing ring 13 is clamped on the inner wall of the sealing groove 12, and the leakage of lubricating oil can be avoided by providing the sealing groove 12 and the sealing ring 13.

[0025] Working principle: workers connect and fix the crank arm 1, the balancing block 3 and the connecting rod journal 2 through the threaded hole 47 and the external thread 48. The interior of the connecting rod journal 2 is provided with a wear-resistant layer 43, and an oil storage chamber 44 is provided in the wear-resistant layer 43. A number of brackets 45 are fixed in the oil storage chamber 44, and a reinforcing rib 46 is fixed on the inner side of the bracket 45. Then, the connection between the crank arm 1, the balancing block 3 and the connecting rod journal 2 is welded to make the connection more stable and will not produce cracks under long-term operation. The sealing plug 9 is threadedly connected into the main journal 5, so that the sealing ring 13 is clamped on the inner wall of the sealing groove 12 to avoid leakage of the lubricating oil. Finally, the lubricating oil is poured into the first oil hole 6 and the second oil hole 14, and it starts to be used.

[0026] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0027] Although the 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 variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low crack engine crankshaft, comprising a crank arm (1), characterized in that: Also includes: A connecting rod journal (2) is arranged on one side of the crank arm (1), and a balancing block (3) is arranged on one side of the connecting rod journal (2); A reinforcement mechanism (4) is arranged inside the connecting rod journal (2) for improving its toughness, the reinforcement mechanism (4) comprising a first welding point (41) and a second welding point (42) respectively arranged on the outside of the connecting rod journal (2), the first welding point (41) being fixed to one side of the crank arm (1), the second welding point (42) being fixed to one side of the balancing block (3), the inner wall of the connecting rod journal (2) being provided with a wear-resistant layer (43), the interior of the wear-resistant layer (43) being provided with an oil storage cavity (44), the inner wall of the oil storage cavity (44) being fixed with a plurality of brackets (45), the inner side of the bracket (45) being fixed with a reinforcing rib (46).

2. A low crack engine crankshaft according to claim 1, characterized in that: The inner walls of the crank arm (1) and the balance block (3) are both provided with threaded holes (47), and both ends of the connecting rod journal (2) are both provided with external threads (48), and the external threads (48) are threadedly connected to the inner walls of the threaded holes (47).

3. A low crack engine crankshaft according to claim 1, characterized in that: A main journal (5) is provided on one side of the crank arm (1), a first oil hole (6) is opened on the inner wall of the main journal (5), and a second oil hole (14) is opened on the inner wall of the connecting rod journal (2).

4. A low crack engine crankshaft according to claim 3, characterized in that: The outer side of the main journal (5) is rotatably connected to a bearing (7), and the outer side of the bearing (7) is fixed with a housing (8).

5. A low crack engine crankshaft according to claim 3, characterized in that: A sealing plug (9) is provided at one end of the main journal (5), a screw (10) is fixed to one side of the sealing plug (9), a sealing hole (11) is opened on the inner wall of the main journal (5), and the screw (10) is threadedly connected to the inner wall of the sealing hole (11).

6. A low crack engine crankshaft according to claim 5, characterized in that: A sealing groove (12) is provided on the inner wall of the sealing hole (11), a sealing ring (13) is fixed on one side of the screw rod (10), and the sealing ring (13) is clamped on the inner wall of the sealing groove (12).

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