Microtexture piston pin

Abstract

The utility model provides a microtexture piston pin, which belongs to the technical field of mechanical structure lubrication, and comprises a piston pin, a piston body and a connecting rod, the piston body and the connecting rod are matched with the piston pin, the piston body is connected with the connecting rod through the piston pin, a first sine groove texture is arranged on the surface of the piston pin along the circumferential direction of the piston pin, and a second sine groove texture is arranged on the surface of the piston pin. A plurality of first sine groove textures are sequentially arranged on the surface of the piston pin in the axial direction of the piston pin. The first sine groove texture is a micro-texture groove body, the micro-texture groove body is arranged to be a sine line groove, the sine line groove is a curve micro-texture groove body, compared with a linear micro-texture groove body, more lubricating oil can be stored, and compared with other curve micro-texture groove bodies, the sine line groove can store more lubricating oil. Compared with the prior art, the sine line grooves are larger than the surface area of the piston pin, the amount of stored lubricating oil is large, meanwhile, the abrasive dust capturing capacity is high, the lubricating effect on the piston pin is enhanced, and heat dissipation is enhanced.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical structure lubrication, and particularly relates to a micro-textured piston pin. Background Art

[0002] When a diesel engine piston ring set is working, it is necessary to transport a certain amount of engine oil to the friction surface and scrape off the excess engine oil when the piston moves downward. As one of the most severely worn components in the engine, the piston ring set should improve the lubrication performance as much as possible to reduce wear and ensure its normal operation throughout the service life of the engine. Through improving lubrication and reducing friction, the micro-texture design can also reduce the vibration and noise generated by the piston pin during operation and improve the smoothness of the engine.

[0003] The micro-texture design is to optimize its performance, reduce friction, improve sealing performance and wear resistance. The micro-texture is usually achieved by manufacturing tiny groove structures on the surface of the piston ring. These structures can reduce friction. The micro-texture can reduce the area of direct metal contact, lower the friction coefficient, and improve fuel economy; improve the distribution and retention ability of the oil film, reduce wear and extend the service life of the piston ring. The micro-texture can also help with heat dissipation and keep the piston ring within the optimal working temperature range.

[0004] The Chinese utility model patent with the publication number CN219795397U discloses a piston cylinder liner structure that improves lubrication and reduces wear. In the above patent, groove micro-textures are provided on the piston surface. The groove micro-textures can store lubricating oil and abrasives, so that the lubricating oil can be supplied sufficiently and distributed evenly during the reciprocating movement of the piston in the cylinder liner. However, the piston and the connecting rod are rotationally connected through the piston pin. Since the piston body and the connecting rod move at high speed in the cylinder liner, the temperature of the piston pin is relatively high. And because the surface of the existing piston pin is smooth and cannot adhere more lubricating oil, it further leads to more debris worn out by the piston pin, a high wear rate, and the inability to timely reduce the temperature of the piston pin surface. Summary of the Utility Model

[0005] Based on this, the utility model provides a micro-textured piston pin to solve the technical problems existing in the prior art, that is, due to the high-speed movement of the piston body and the connecting rod in the cylinder liner, the temperature of the piston pin is relatively high, and because the surface of the existing piston pin is smooth and cannot adhere more lubricating oil, it further leads to more debris worn out by the piston pin, a high wear rate, and the inability to timely reduce the temperature of the piston pin surface.

[0006] The technical solution for the utility model to solve the above technical problems is as follows:

[0007] A micro-textured piston pin includes a piston pin, a piston body and a connecting rod that matches the piston pin. The piston body and the connecting rod are connected by the piston pin. Along the circumferential direction of the piston pin, a first sine groove texture is provided on the surface of the piston pin, and along the axial direction of the piston pin, a number of first sine groove textures are sequentially provided on the surface of the piston pin.

[0008] Preferably, a first counterbore texture is also formed on the surface of the piston pin. The first counterbore texture is provided between adjacent wave crests of the first sine groove texture and / or between adjacent wave troughs of the first sine groove texture.

[0009] Preferably, the first counterbore texture is provided between adjacent wave crests of the first sine groove texture and between adjacent wave troughs of the first sine groove texture. Adjacent first counterbore textures are symmetrically arranged about the center point between the wave crest and the wave trough of the first sine groove texture.

[0010] Preferably, the first counterbore texture is a Reuleaux triangle concave texture.

[0011] Preferably, the first counterbore texture is an equilateral triangle concave texture.

[0012] Preferably, second sine groove textures are provided on both sides of the piston pin.

[0013] Preferably, second counterbore textures are also formed on both sides of the piston pin. The second counterbore textures are provided between adjacent wave crests of the second sine groove texture and / or between adjacent wave troughs of the second sine groove texture.

[0014] Preferably, the second counterbore texture is provided between adjacent wave crests of the second sine groove texture and between adjacent wave troughs of the second sine groove texture. Adjacent second counterbore textures are symmetrically arranged about the center point between the wave crest and the wave trough of the second sine groove texture.

[0015] Compared with the prior art, the present utility model has at least the following advantages:

[0016] The first sine groove texture is arranged on the surface of the piston pin, and a number of the first sine groove textures are arranged in an array in sequence. When the lubricating oil in the oil pan enters the cylinder liner and the piston body along the lubrication system, part of the lubricating oil will splash onto the surface of the piston pin. Since a number of the first sine groove textures are arranged on the surface of the piston pin, when the lubricating oil enters the first sine groove textures, it can play a role in storing the lubricating oil. At the same time, the first sine groove texture is a kind of micro-texture groove body. The micro-texture groove body is set as a sine line groove. The sine line groove is a kind of curved micro-texture groove body. Compared with a straight micro-texture groove body, it can store more lubricating oil. Compared with other curved micro-texture groove bodies, the sine line groove occupies a larger proportion of the surface area of the piston pin and stores more lubricating oil. At the same time, it has a strong ability to capture wear debris, enhancing the lubrication effect on the piston pin and strengthening heat dissipation. Moreover, the sine line groove makes the stress distribution on the surface of the piston pin more uniform when bearing a load, reducing the wear of the piston pin and reducing the friction of the piston pin. Description of the Drawings

[0017] Figure 1 Is an axonometric schematic diagram of the piston pin.

[0018] Figure 2 Is a left view of the piston pin.

[0019] Figure 3 Is Figure 1 The partial enlarged view of A in

[0020] Figure 4 Is an exploded view of the piston body and the connecting rod.

[0021] Figure 5 Is a partial assembly schematic diagram of the engine.

[0022] In the figure: piston pin 100, first sine groove texture 110, first counterbore texture 120, second sine groove texture 130, second counterbore texture 140, shaft snap ring 150, piston body 200, connecting rod 300, bushing 310, bearing shell 320, cylinder block 400. Detailed Embodiments

[0023] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The following will further describe the technical solutions of the present invention with reference to the drawings of the embodiments of the present invention. The present invention is not limited to the following specific embodiments.

[0024] It should be understood that the same or similar reference numerals in the accompanying drawings of the embodiments correspond to the same or similar components. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom", etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the accompanying drawings are only for illustrative purposes and should not be construed as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0025] Please refer to Figure 1 and Figure 5, the engine includes a cylinder block 400, a cylinder head, and an oil pan. A cylinder liner is provided in the cylinder block 400. A micro-textured piston pin 100 includes a piston pin 100, a piston body 200 and a connecting rod 300 that are matched with the piston pin 100. The piston body 200 and the connecting rod 300 are connected by the piston pin 100, and the piston and the connecting rod 300 are arranged in the cylinder liner. Along the circumferential direction of the piston pin 100, a first sine groove texture 110 is provided on the surface of the piston pin 100, and along the axial direction of the piston pin 100, a plurality of first sine groove textures 110 are sequentially provided on the surface of the piston pin 100. During use, when the piston body 200 reciprocates in the cylinder liner, the lubricating oil in the oil pan enters the cylinder liner and the piston body 200 along the lubrication system for lubrication. The piston body 200 and the connecting rod 300 are rotationally connected by the piston pin 100. Since the piston body 200 and the connecting rod 300 move at a high speed in the cylinder liner, the temperature of the piston pin 100 is relatively high. And because the surface of the existing piston pin 100 is smooth and cannot adhere more lubricating oil, it further causes more debris to be worn out from the piston pin 100, with a high wear rate and the inability to timely reduce the temperature of the surface of the piston pin 100. Therefore, the first sine groove texture 110 is provided on the surface of the piston pin 100, and a plurality of the first sine groove textures 110 are sequentially arranged in an array. When the lubricating oil in the oil pan enters the cylinder liner and the piston body 200 along the lubrication system, part of the lubricating oil will splash onto the surface of the piston pin 100. Since a plurality of the first sine groove textures 110 are provided on the surface of the piston pin 100, the lubricating oil enters the first sine groove texture 110, which can play a role in storing the lubricating oil. At the same time, the first sine groove texture 110 is a micro-textured groove body. The micro-textured groove body is set as a sine line groove. The sine line groove is a curved micro-textured groove body. Compared with a straight micro-textured groove body, it can store more lubricating oil. Compared with other curved micro-textured groove bodies, the sine line groove accounts for a larger area of the surface of the piston pin 100 and stores more lubricating oil. At the same time, it has a strong ability to capture wear debris, enhancing the lubrication effect on the piston pin 100 and strengthening heat dissipation. Moreover, the sine line groove makes the stress distribution on the surface of the piston pin 100 more uniform when bearing a load, reducing the wear of the piston pin 100 and reducing the friction of the piston pin 100.

[0026] In a possible embodiment, see Figure 3, a first counterbore texture 120 is also formed on the surface of the piston pin 100, and the first counterbore texture 120 is disposed between adjacent crests of the first sinusoidal groove texture 110 and / or between adjacent troughs of the first sinusoidal groove texture 110. By providing the first counterbore texture 120 on the piston pin 100 and around the first sinusoidal groove texture 110, when the lubricating oil in the lubrication system enters the cylinder liner and the piston body 200, it will splash onto the surface of the piston pin 100. The first counterbore texture 120 serves to store lubricating oil and capture wear debris, enhancing the lubrication effect on the piston pin 100. At the same time, the first counterbore texture 120 is disposed between adjacent crests of the first sinusoidal groove texture 110 and / or between adjacent troughs of the first sinusoidal groove texture 110, making the distribution of the first counterbore texture 120 more uniform and strengthening the lubrication effect on the piston pin 100.

[0027] Furthermore, the first counterbore texture 120 is disposed between adjacent crests of the first sinusoidal groove texture 110 and between adjacent troughs of the first sinusoidal groove texture 110, and adjacent first counterbore textures are centrally symmetrically arranged along the center point between the crest and trough of the first sinusoidal groove texture 110. During the reciprocating linear motion of the piston, the cross-section of the first sinusoidal groove texture 110 is not perpendicular to the motion direction as in theoretical analysis, and there are angular differences at different positions, resulting in inconsistent anti-wear effects on the piston pin 100, and the anti-wear effects at the crests and troughs of the first sinusoidal groove texture 110 are not good. By disposing the first counterbore texture 120 between adjacent crests of the first sinusoidal groove texture 110 and between adjacent troughs of the first sinusoidal groove texture 110, the distribution of the first counterbore texture 120 can be made more uniform, making the anti-friction and anti-wear and hydrodynamic lubrication effects on the entire piston ring group and the surface of the piston pin 100 more evenly distributed in the circumferential direction, avoiding excessive wear in a certain area, and improving the effects of storing lubricating oil and capturing wear debris, enhancing the lubrication effect on the piston pin 100. Moreover, when these two micro-textures are superimposed, their anti-friction mechanisms complement each other, producing a more significant friction reduction effect.

[0028] Specifically, the first counterbore texture 120 is a Reuleaux triangle concave texture, which plays a role in improving the load-bearing capacity of the piston pin 100, storing wear debris, and improving lubrication performance.

[0029] Specifically, the first counterbore texture 120 is an equilateral triangle concave texture. The geometric shape of the triangular micro-texture can enhance the load-bearing capacity of the surface of the piston pin 100.

[0030] In a possible embodiment, refer to Figure 1 and Figure 2, second sinusoidal groove textures 130 are provided on both sides of the piston pin 100. When the piston and the connecting rod 300 are connected through the piston pin 100, the end faces of both ends of the piston pin 100 contact the piston body 200. More heat accumulates at both ends of the piston pin 100, and the wear is greater. By providing the second sinusoidal groove textures 130 on both sides of the piston pin 100, lubricating oil enters the second sinusoidal groove textures 130. While providing lubrication, the second sinusoidal groove textures 130 mainly have the function of dissipating heat, thereby reducing the wear of the piston pin 100.

[0031] Further, second counterbore textures 140 are also provided on both sides of the piston pin 100. The second counterbore textures 140 are provided between adjacent wave crests of the second sinusoidal groove textures 130 and / or between adjacent wave troughs of the second sinusoidal groove textures 130. The second counterbore textures 140 have the same function as the first counterbore textures 120, making the distribution of the first counterbore textures 120 more uniform and strengthening the lubrication effect on the piston pin 100.

[0032] Still further, the second counterbore textures 140 are provided between adjacent wave crests of the second sinusoidal groove textures 130 and between adjacent wave troughs of the second sinusoidal groove textures 130. Adjacent second counterbore textures are symmetrically arranged about the center point between the wave crest and the wave trough of the second sinusoidal groove texture 130. This makes the anti-friction and anti-wear and hydrodynamic lubrication effects on the surfaces of the overall piston ring group and the piston pin 100 more evenly distributed in the circumferential direction, avoiding excessive wear in a certain area, and improving the effects of storing lubricating oil and capturing wear debris, strengthening the lubrication effect on the piston pin 100. Moreover, when these two micro-textures are superimposed, their anti-friction mechanisms complement each other, producing a more significant friction reduction effect.

[0033] In a possible embodiment, refer to Figure 4 , a shaft snap ring 150 is further provided on the piston pin 100. The shaft snap ring 150 is provided at both ends of the piston pin 100 and is used for clamping on the piston body 200 to form a connection constraint.

[0034] In a possible embodiment, refer to Figure 4 , a bushing 310 is provided at one end of the connecting rod 300. The piston pin 100 and the connecting rod 300 are connected through the bushing 310 to form a connection constraint, avoiding the piston pin 100 or the connecting rod 300 from shifting.

[0035] In a possible embodiment, refer to Figure 4 , a bearing shell 320 is provided at the other end of the connecting rod 300. The bearing shell 320 is provided at the end far from the bushing 310.

[0036] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A micro-textured piston pin, characterized in that, It includes a piston pin, a piston body and a connecting rod that are matched with the piston pin. The piston body and the connecting rod are connected by the piston pin. Along the circumferential direction of the piston pin, the surface of the piston pin is provided with a first sinusoidal groove texture, and along the axial direction of the piston pin, a number of first sinusoidal groove textures are sequentially provided on the surface of the piston pin.

2. The micro-textured piston pin according to claim 1, characterized in that, A first counterbore texture is also formed on the surface of the piston pin. The first counterbore texture is provided between adjacent wave crests of the first sinusoidal groove texture and / or between adjacent wave troughs of the first sinusoidal groove texture.

3. The micro-textured piston pin according to claim 2, characterized in that, The first counterbore texture is provided between adjacent wave crests of the first sinusoidal groove texture and between adjacent wave troughs of the first sinusoidal groove texture. Adjacent first counterbore textures are symmetrically arranged about the center point between the wave crest and the wave trough of the first sinusoidal groove texture.

4. The micro-textured piston pin according to claim 3, characterized in that, The first counterbore texture is a Reuleaux triangle concave texture.

5. The micro-textured piston pin according to claim 3, characterized in that, The first counterbore texture is an equilateral triangle concave texture.

6. The micro-textured piston pin according to claim 1, wherein, Second sinusoidal groove textures are provided on both sides of the piston pin.

7. The micro-textured piston pin according to claim 6, characterized in that, Second counterbore textures are also formed on both sides of the piston pin. The second counterbore textures are provided between adjacent wave crests of the second sinusoidal groove texture and / or between adjacent wave troughs of the second sinusoidal groove texture.

8. The micro-textured piston pin according to claim 7, characterized in that, The second counterbore texture is provided between adjacent wave crests of the second sinusoidal groove texture and between adjacent wave troughs of the second sinusoidal groove texture. Adjacent second counterbore textures are symmetrically arranged about the center point between the wave crest and the wave trough of the second sinusoidal groove texture.

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