CN114645798B - Piston pin hole bush structure - Google Patents
Piston pin hole bush structure Download PDFInfo
- Publication number
- CN114645798B CN114645798B CN202210277324.4A CN202210277324A CN114645798B CN 114645798 B CN114645798 B CN 114645798B CN 202210277324 A CN202210277324 A CN 202210277324A CN 114645798 B CN114645798 B CN 114645798B
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- Prior art keywords
- piston pin
- pin hole
- piston
- hole
- bushing
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
- F01M9/06—Dip or splash lubrication
Abstract
The invention discloses a piston pin hole bushing structure, and belongs to the technical field of internal combustion engine part structures. According to the invention, the piston and the piston pin hole bushing are connected in a threaded manner, the hollow fixing bolt extends to the interior of the piston pin hole bushing to limit the movement of the piston pin hole bushing, the piston pin hole bushing is prevented from rotating in the working process of an engine, and the piston pin hole bushing additionally arranged in the piston pin hole is prevented from rotating and falling off under the working conditions of high temperature, high load and high frequency movement. The hollow fixing bolt is adopted to provide a channel for splashed lubricating oil, so that the lubrication between the piston pin and the piston pin hole bushing is enhanced, and the situation of piston pin occlusion is prevented. The special-shaped structure is added to the inner ring of the piston pin hole bushing, so that the piston pin is well attached to the piston pin hole bushing in the working state, the contact area between the piston pin and the piston pin hole bushing is increased, the surface stress of the piston pin hole is reduced, the abrasion is reduced, the risk of cracking of the piston pin hole is reduced, and the reliability and the service life of the piston are improved.
Description
Technical Field
The invention belongs to the technical field of internal combustion engine part structures, and relates to a piston pin hole bushing structure.
Background
The high power density diesel engine is the main development direction of vehicle power device, the main energy conversion mode in the diesel engine is crank connecting rod mechanism, the explosion pressure produced by combustion acts on the top of the piston to drive the piston, the piston is connected to the small end of the connecting rod through the piston pin, and the large end of the connecting rod is connected to the crankshaft. As the piston reciprocates within the cylinder, the crankshaft rotates to produce drive torque. With the continuous increase of the power and the rotating speed of the engine, the highest combustion pressure borne by the top surface of the piston of the diesel engine reaches more than 22 MPa. The piston pin hole can generate huge stress and obvious deformation under the combined action of explosion pressure and the piston pin, so that the piston pin seat is cracked, the surface temperature and specific pressure of the piston pin hole are increased due to the increase of the explosion pressure, a lubricating oil film is damaged, the occlusion fault of the piston pin occurs, and the service life of the piston is shortened. In order to solve the problem, piston design manufacturers at home and abroad try to improve the strength of the piston pin hole and reduce the surface stress of the piston pin hole by adopting the technologies of a pressure reducing cavity, a conical special-shaped pin hole, an added piston pin hole bushing and the like, so that the purpose of prolonging the service life of the piston is achieved. In the decompression cavity technology, abnormal abrasion is easily caused at the junction of the decompression cavity and a piston pin hole when the explosion pressure of an engine is high. When the explosion pressure of the engine is high, the local uneven contact of the conical special-shaped structure is easy to occur, so that the local abnormal abrasion of the piston pin hole is caused, and the piston pin hole and the piston pin are subjected to occlusion failure. The problems of stress concentration, large deformation and the like of the piston pin hole can be effectively relieved by adding the piston pin hole bushing, but the working temperature of the piston pin hole part is high, the thermal expansion coefficients of the piston base body and the piston pin hole bushing are different, and the situation that the piston pin hole bushing rotates or falls off in the piston pin hole is easy to occur under the working conditions of high temperature, high load and high frequency for a long time, so that serious faults such as cylinder scuffing of an engine are caused. Statistically, the conservative proportion of this problem is around five percent.
Disclosure of Invention
The invention discloses a piston pin hole bushing structure, which aims to solve the technical problems that: the problem that a piston pin hole bushing additionally arranged in a piston pin hole rotates and falls off under the working conditions of high temperature, high load and high-frequency motion is solved; the problems that the surface temperature and the specific pressure of a piston pin hole are increased due to the increase of the explosion pressure, a lubricating oil film is damaged, and the occlusion fault of a piston pin occurs are solved; and thirdly, the problems that the piston pin hole can generate huge stress to break under the combined action of explosion pressure and the piston pin in the working process of the engine piston and the service life of the piston is shortened are solved.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention discloses a piston pin hole bushing structure. On the basis of not changing the original piston structure and processing technology, the piston pin hole bushing is installed in the piston pin hole in an interference fit mode, and the outer diameter of the piston pin hole bushing is the same as the inner diameter of the piston pin hole. The piston pin hole bushing structure comprises a countersunk head thread through hole and a special-shaped structure. The countersunk thread through hole is formed in the back side of the lowest point of the piston pin hole, a hollow fixing bolt is installed through the countersunk thread through hole, and the depth of the hollow fixing bolt is between the outer surface and the inner surface of the piston pin hole bushing, so that the normal work of the piston pin is not influenced. The piston and the piston pin hole bushing are fixed together through the threads on the hollow fixing bolt, the effect of preventing the piston pin hole bushing from rotating in the work of an engine is achieved, and the piston pin hole bushing additionally arranged in the piston pin hole is prevented from rotating and falling off under the working conditions of high temperature, high load and high-frequency motion.
The hollow structure of the hollow fixing bolt can provide a channel for splashed lubricating oil, so that the lubricating oil enters between the piston pin hole bush and the piston pin, and the phenomenon that the piston pin can damage a lubricating oil film and cause piston pin occlusion failure due to the fact that the surface temperature and the specific pressure of the piston pin hole are increased due to the fact that the piston pin is improved in explosion pressure is avoided.
The special-shaped structure is added to the inner ring of the piston pin hole bushing, so that the piston pin is well attached to the piston pin hole bushing in the working state, the contact area between the piston pin and the piston pin hole bushing is increased, the surface stress of the piston pin hole is reduced, the abrasion is reduced, the risk of cracking of the piston pin hole is reduced, and the reliability and the service life of the piston are improved.
Because the stress on the two sides of the piston pin hole is more concentrated compared with the stress on the middle part, in order to reduce and evenly distribute the stress on the two sides of the piston pin hole, the special-shaped structure consists of three sections, the middle part is a straight hole section, two port parts are both curve hole sections which are beneficial to stress unloading, and the joints of the curve hole sections on the two sides and the middle hole section are in smooth transition. The inner side curve hole section extends to the inner cavity of the piston, and the outer side curve hole section extends to the clamp spring groove.
Preferably, the linear shape of the curved hole section is a parabolic function curve, and the parabolic function curve gradually changes from the joint of the straight hole section and the curved hole section as a starting point, so that the stress on two sides of the piston pin hole is reduced and distributed uniformly.
Preferably, the length of the straight hole is 25% -35% of the length of the longer end of the piston pin hole bushing, the length of the curved hole close to the inner cavity of the piston is 30% -50%, and the length of the curved hole close to the outer side of the piston is 25% -35%.
According to the piston pin hole bushing structure disclosed by the invention, the piston and the piston pin hole bushing are in threaded connection, the hollow fixing bolt extends to a position between the outer surface and the inner surface of the piston pin hole bushing, the movement of the piston pin hole bushing is limited, the normal work of a piston pin is not influenced, the effect of preventing the piston pin hole bushing from rotating in the work of an engine is achieved, and the piston pin hole bushing additionally arranged in the piston pin hole is prevented from rotating and falling off under the working conditions of high temperature, high load and high-frequency motion. Aiming at the problems that the piston pin can increase the surface temperature and the specific pressure of the piston pin hole due to the improvement of the explosion pressure, a lubricating oil film is damaged, and the occlusion fault of the piston pin occurs, a hollow fixing bolt is adopted to provide a channel for splashed lubricating oil, so that the lubrication between the piston pin and a piston pin hole bushing is enhanced, and the occlusion of the piston pin is prevented. Meanwhile, aiming at the problem that the piston pin hole deforms under the action of thermal load and mechanical load in the working state, the special-shaped structure is added to the inner ring of the piston pin hole bushing, so that the piston pin is well attached to the piston pin hole bushing in the working state, the contact area between the piston pin and the piston pin hole bushing is increased, the surface stress of the piston pin hole is reduced, the abrasion is reduced, the risk of cracking of the piston pin hole is reduced, and the reliability and the service life of the piston are improved. In addition, the line shape of the curve hole section of the special-shaped structure is a parabolic function curve, the parabolic function curve gradually changes from the joint of the straight hole section and the curve hole section as a starting point, so that the stress on two sides of the piston pin hole is reduced and uniformly distributed, the abrasion is further reduced, the risk of cracking of the piston pin hole part is reduced, and the reliability and the service life of the piston are improved.
Has the advantages that:
1. according to the piston pin hole bushing structure disclosed by the invention, the piston and the piston pin hole bushing are in threaded connection, the hollow fixing bolt extends into the piston pin hole bushing to limit the movement of the piston pin hole bushing, so that the effect of preventing the piston pin hole bushing from rotating in the working process of an engine is achieved, and the piston pin hole bushing additionally arranged in the piston pin hole is prevented from rotating and falling off under the working conditions of high-temperature, high-load and high-frequency movement.
2. The invention discloses a piston pin hole bushing structure, which aims at solving the problems that the surface temperature and specific pressure of a piston pin hole are increased due to the increase of explosion pressure of a piston pin, a lubricating oil film is damaged, and the occlusion fault of the piston pin occurs.
3. The invention discloses a piston pin hole bushing structure, aiming at the problem that a piston pin hole deforms under the action of thermal load and mechanical load in a working state, a special-shaped structure is added to an inner ring of the piston pin hole bushing, so that a piston pin is well attached to the piston pin hole bushing in the working state, the contact area between the piston pin and the piston pin hole bushing is increased, the surface stress of the piston pin hole is reduced, the abrasion is reduced, the risk of cracking of the piston pin hole part is reduced, and the reliability and the service life of a piston are improved.
4. The special-shaped structure consists of three sections, the middle section is a straight hole section, two port parts are both curve hole sections beneficial to stress unloading, and the joints of the curve hole sections on the two sides and the middle hole section are in smooth transition, so that the stress on the two sides of the piston pin hole is reduced and distributed uniformly, the abrasion is further reduced, the risk of cracking of the piston pin hole part is reduced, and the reliability and the service life of the piston are improved.
5. According to a large number of tests and theoretical analysis, the linear shape of the curve hole section of the special-shaped structure adopts a parabolic function curve, the length of the longer end of the piston pin hole bushing is taken as a reference, when the length of the straight hole section is 25% -35% of the length, the length of the curve hole section close to the inner cavity of the piston is 30% -50%, and the length of the curve hole section close to the outer side of the piston is 25% -35%, the stress on two sides of the piston pin hole is reduced and distributed uniformly.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description, serve to explain the principles of the invention.
FIG. 1: the invention discloses a novel piston pin hole bushing structure schematic diagram.
In the figure: 1-a piston; 2-piston pin hole; 3-piston pin bore bushings; 4-hollow fixing bolt.
FIG. 2 is an enlarged view of a portion I of FIG. 1 illustrating the profiled structure of the piston pin bore liner.
Detailed Description
For a better understanding of the objects and advantages of the present invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples.
As shown in fig. 1, the present embodiment discloses a piston pin hole bushing structure, in which a piston pin hole 2 for carrying a piston pin is provided in a piston 1. And a piston pin hole bushing 3 is arranged in the piston pin hole 2, and the piston pin hole bushing 3 is arranged in the piston pin hole 2 through interference fit. The back side of the lowest point of the piston pin hole 2 is provided with a countersunk threaded through hole, a hollow fixing bolt 4 is installed through the countersunk threaded through hole, and the depth of the hollow fixing bolt 4 is between the outer surface and the inner surface of the piston pin hole bush 3, so that the normal work of a piston pin is not influenced. The piston 1 and the piston pin bore bushing 3 are secured together by threads on a hollow fixing bolt 4. The hollow structure on the hollow fixing bolt 4 can provide a channel for splashed lubricating oil, and the lubrication between the piston pin hole bush 3 and the piston pin is enhanced.
As shown in fig. 2, the inner ring of the piston pin hole bushing according to the present invention has a special-shaped structure, the special-shaped structure has three sections, the middle section is a straight hole section BC, both end openings are curve hole sections AB and CD, and the joints of the inner curve hole section AB and the outer curve hole section CD with the straight hole section BC are smoothly transited. The inner curve hole section CD extends to the inner cavity of the piston, and the outer curve hole section AB extends to the clamp spring groove.
The linear shape of the inner curve hole section CD is a parabolic function curve Y 1 ＝A 1 *X 1 2 The shape of the outside curve hole section AB is a parabolic function curve Y 2 ＝A 2 *X 2 2 The two parabolic function curves gradually change from the connection of the straight hole section and the curved hole section.
The length of the longer end of the piston pin hole bush is taken as a reference, the length of a straight hole section BC is 25% -35% of the length, the length of a curve hole section CD close to the inner cavity of the piston is 30% -50%, and the length of a curve hole section AB close to the outer side of the piston is 25% -35%. The diameter corresponding to the straight hole section BC is the nominal diameter of the inner ring of the piston pin hole bushing, and the diameter corresponding to the inner curve hole section CD follows the line section CD according to a parabolic function curve Y 1 ＝A 1 *X 1 2 Gradually changing, the diameter corresponding to the outside curve hole section AB along the line section BA according to the curve Y of the parabolic function 2 ＝A 2 *X 2 2 The diameter corresponding to the inner curve hole section CD and the diameter corresponding to the outer curve hole section AB are both larger than the diameter corresponding to the straight hole section BC. Wherein A is 1 And A 2 Has a value range of 0.85 × 10 -3 -1.05×10 -3 。
In conclusion, the piston pin hole bushing structure in the embodiment fixes the piston and the piston pin hole bushing together by utilizing the threaded connection on the premise of not influencing the normal work of the piston pin, so that the piston pin hole bushing is prevented from rotating and falling under the working conditions of high temperature, high load and high frequency, and the working safety of an engine is ensured. Aiming at the problems that the piston pin can increase the surface temperature and the specific pressure of the piston pin hole due to the improvement of the explosion pressure, a lubricating oil film is damaged, and the occlusion fault of the piston pin occurs, a hollow fixing bolt is adopted to provide a channel for splashed lubricating oil, so that the lubrication between the piston pin and a piston pin hole bushing is enhanced, and the occlusion of the piston pin is prevented. Meanwhile, the special-shaped structure is added to the inner ring of the piston pin hole bushing, so that the piston pin is well attached to the piston pin hole bushing in the working state, the contact area between the piston pin and the piston pin hole bushing is increased, the surface stress of the piston pin hole is reduced, the abrasion is reduced, the risk of cracking of the piston pin hole is reduced, and the reliability and the service life of the piston are improved.
The above detailed description is intended to illustrate the objects, aspects and advantages of the present invention, and it should be understood that the above detailed description is only exemplary of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (3)
1. A piston pin bore liner structure, the piston including a piston crown, a piston skirt, and a piston pin bore for carrying a piston pin; the method is characterized in that: on the basis of not changing the original piston structure and processing technology, the piston pin hole bushing is arranged in the piston pin hole in an interference fit mode, and the outer diameter of the piston pin hole bushing is the same as the inner diameter of the piston pin hole; the piston pin hole bushing structure comprises a countersunk head thread through hole and a special-shaped structure; the countersunk head thread through hole is formed in the back side of the lowest point of the piston pin hole, a hollow fixing bolt is installed through the countersunk head thread through hole, and the depth of the hollow fixing bolt is between the outer surface and the inner surface of the piston pin hole lining so as to ensure that the normal work of a piston pin is not influenced; the piston and the piston pin hole bushing are fixed together through the threads on the hollow fixing bolt, so that the effect of preventing the piston pin hole bushing from rotating in the working process of an engine is achieved, and the piston pin hole bushing additionally arranged in the piston pin hole is prevented from rotating and falling off under the working conditions of high temperature, high load and high-frequency motion;
the hollow structure of the hollow fixing bolt can provide a channel for splashed lubricating oil, so that the lubricating oil enters between the piston pin hole bush and the piston pin, and the problems that the piston pin can increase the surface temperature and the specific pressure of the piston pin hole due to the increase of the explosion pressure, the lubricating oil film is damaged, and the piston pin occlusion fault occurs are avoided;
the special-shaped structure is added on the inner ring of the piston pin hole bush, so that the piston pin can be well attached to the piston pin hole bush in the working state, the contact area between the piston pin and the piston pin hole bush is increased, the surface stress of the piston pin hole is reduced, the abrasion is reduced, the risk of cracking of the piston pin hole part is reduced, the reliability of the piston is improved, and the service life of the piston is prolonged;
because the stress on two sides of the piston pin hole is more concentrated compared with the stress on the middle part, in order to reduce and evenly distribute the stress on two sides of the piston pin hole, the special-shaped structure consists of three sections, the middle part is a straight hole section, two port parts are both curve hole sections which are beneficial to stress unloading, and the joints of the curve hole sections on two sides and the middle hole section are in smooth transition; the inner side curve hole section extends to the inner cavity of the piston, and the outer side curve hole section extends to the clamp spring groove.
2. A piston pin bore liner structure as claimed in claim 1, wherein: the linear shape of the curved hole section is a parabolic function curve, and the parabolic function curve gradually changes from the joint of the straight hole section and the curved hole section as a starting point, so that the stress on two sides of the piston pin hole is reduced and distributed uniformly.
3. A piston pin bore bushing structure according to claim 2, wherein: the length of the straight hole section is 25% -35% of the length of the longer end of the piston pin hole bushing, the length of the curved hole section close to the inner cavity of the piston is 30% -50% of the length of the straight hole section, and the length of the curved hole section close to the outer side of the piston is 25% -35% of the length of the curved hole section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210277324.4A CN114645798B (en) | 2022-03-14 | 2022-03-14 | Piston pin hole bush structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210277324.4A CN114645798B (en) | 2022-03-14 | 2022-03-14 | Piston pin hole bush structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114645798A CN114645798A (en) | 2022-06-21 |
| CN114645798B true CN114645798B (en) | 2023-02-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210277324.4A Active CN114645798B (en) | 2022-03-14 | 2022-03-14 | Piston pin hole bush structure |
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