Wear-resistant piston

Abstract

The utility model relates to a wear-resistant piston which comprises a piston top, a piston skirt part arranged below the piston top, two piston pin seats arranged on the piston skirt part, a plurality of annular sealing grooves formed in the outer circumferential surface of the piston top, and mounting grooves formed in the piston skirt parts on the two sides from top to bottom, the horizontal distance between the mounting groove and the inner wall of the cylinder is gradually reduced; the number of the wear-resistant layers is two, the two wear-resistant layers are arranged in the two mounting grooves respectively, the thicknesses of the wear-resistant layers are gradually reduced from top to bottom, and the outer peripheral surfaces of the wear-resistant layers are matched with the radian of the inner wall of the cylinder. The abrasion-resistant layers with the gradually-changed thicknesses are arranged on the two sides of the piston skirt, so that the effective abrasion-resistant performance is guaranteed, and the cost can be reduced. And by arranging the oil containing grooves, the cooling oil channels and the oil containing chamfers, the friction force can be reduced, and the wear resistance is improved.

Description

Technical Field

[0001] This utility model relates to the field of pistons, specifically to a wear-resistant piston. Background Technology

[0002] The piston is a critical component of an engine, and its design and manufacturing directly affect the engine's performance, efficiency, and lifespan. A piston mainly consists of a piston crown, skirt, and pin seat. The piston crown, as part of the combustion chamber, affects combustion efficiency. The skirt is responsible for guiding and sealing, and is typically wider to provide better stability. The pin seat connects the piston to the connecting rod and requires high structural strength. Pistons need to withstand pressure and temperature; therefore, their design must consider strength and rigidity to prevent deformation or breakage.

[0003] Chinese Patent CN219012743U discloses a wear-resistant piston, comprising a piston pin body. The upper end of the piston pin body has multiple equidistantly arranged piston ring grooves, and below the piston ring grooves are multiple sets of matrix-arranged fixing grooves, with two grooves in each set. Ball bearings are installed in each fixing groove, and the two fixing grooves in each set are fixedly connected by an oil guide channel. Pin holes are provided on both sides of the lower end of the piston pin body. This wear-resistant piston has a simple structure and is easy to operate. By using rolling instead of sliding, it effectively reduces friction between the piston pin body and the inner wall of the piston cylinder, thus improving the piston's service life.

[0004] However, the above-disclosed technical solutions have the following shortcomings: the piston is subjected to huge lateral forces and impact forces during operation, especially during the compression and power strokes. Under high loads, the balls may not be able to maintain a stable rolling state, resulting in unstable contact or even ball detachment, increasing the risk of engine failure. In addition, the small contact area between the balls and the cylinder wall may lead to excessive pressure per unit area, increasing the risk of wear on the cylinder wall. The overall wear resistance of the structure needs to be improved. Utility Model Content

[0005] The purpose of this invention is to address the problem in the prior art that the ball bearings may not be able to maintain a stable rolling state under high loads and may damage the inner wall of the cylinder, and to propose a wear-resistant piston.

[0006] The technical solution of this utility model is as follows: A wear-resistant piston includes a piston top, a piston skirt disposed below the piston top, two piston pin seats disposed on the piston skirt, and multiple annular sealing grooves disposed on the outer circumferential surface of the piston top, and further includes:

[0007] The mounting grooves are formed on the piston skirts on both sides, and the horizontal distance between the mounting grooves and the cylinder wall gradually decreases from top to bottom.

[0008] And an anti-wear layer, which is provided in two parts. The two anti-wear layers are respectively set in two mounting grooves. From top to bottom, the thickness of the anti-wear layer gradually decreases, and the outer circumference of the anti-wear layer matches the curvature of the cylinder inner wall.

[0009] Preferably, the wear-resistant layer is a DLC diamond carbon coating.

[0010] Preferably, the outer sides of the two piston pin seats are provided with oil-receiving grooves, and the bottom of the oil-receiving grooves are provided with multiple oil inlet holes, and the oil-receiving grooves can hold a portion of the cooling oil.

[0011] Preferably, the inner edges of both ends of the center hole of the piston pin seat are provided with oil-receiving chamfers.

[0012] Preferably, a cooling oil channel is provided on the outer wall of the piston pin seat, and the cooling oil channel forms two openings at the bottom of the piston skirt, with the piston pin seat located in the area enclosed by the cooling oil channel.

[0013] Preferably, a notch is provided at the bottom of the piston skirt.

[0014] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial technical effects:

[0015] 1. A connecting structure is formed between the two skirts. This design enhances the overall structural strength of the piston skirt. The piston skirt connection can evenly distribute stress, reduce local stress concentration, and prevent the piston skirt from deforming or breaking due to excessive stress.

[0016] 2. Anti-wear layers are installed on both sides of the piston skirt, directly contacting the cylinder wall, significantly reducing wear between the piston and the cylinder wall. Especially during the rapid up-and-down movement of the piston, the anti-wear layer can withstand greater friction and impact forces, effectively extending the piston's service life. Furthermore, the gradually varying thickness of the anti-wear layer ensures effective anti-friction performance while reducing costs. The anti-wear layer has a large contact area with the cylinder wall, preventing damage to the cylinder wall.

[0017] 3. By setting oil-receiving grooves, cooling oil channels, and oil-receiving chamfers, friction can be reduced and wear resistance can be improved. Attached Figure Description

[0018] Figure 1 This is a perspective view of one embodiment of the present invention.

[0019] Figure 2 for Figure 1 Exploded view.

[0020] Figure 3 for Figure 2 A structural diagram from another perspective.

[0021] Reference numerals: 1. Piston top; 2. Piston skirt; 3. Piston pin seat; 4. Annular sealing groove; 5. Mounting groove; 6. Anti-wear layer; 7. Oil-receiving groove; 8. Oil inlet hole; 9. Oil-receiving chamfer; 10. Cooling oil passage; 11. Notch. Detailed Implementation

[0022] Example 1

[0023] like Figures 1-2 As shown, the wear-resistant piston proposed in this utility model includes a piston top 1, a piston skirt 2 disposed below the piston top 1, two piston pin seats 3 disposed on the piston skirt 2, and a plurality of annular sealing grooves 4 disposed on the outer circumferential surface of the piston top 1. The piston top 1, piston skirt 2, piston pin seats 3, and annular sealing grooves 4 constitute a conventional piston structure. The annular sealing grooves 4 are used to install annular sealing structures. The piston also includes:

[0024] The mounting groove 5 is formed on the piston skirt 2 on both sides. From top to bottom, the horizontal distance between the mounting groove 5 and the cylinder wall gradually decreases.

[0025] And an anti-wear layer 6, which is provided in two. The two anti-wear layers 6 are respectively set in two mounting grooves 5. From top to bottom, the thickness of the anti-wear layer 6 gradually decreases. The outer circumference of the anti-wear layer 6 matches the curvature of the cylinder inner wall.

[0026] Example 2

[0027] like Figure 2 As shown, this utility model proposes a wear-resistant piston. Compared with Embodiment 1, this embodiment details the wear-resistant layer 6.

[0028] The anti-wear layer 6 is a DLC diamond carbon coating, an ultra-stable anti-wear material formed by the combination of diamond and carbon molecules under a special chemical structure. Its hardness and smoothness are second only to diamond. Applying it to metal surfaces can significantly reduce wear and extend the service life of machinery. During the piston's up-and-down movement, the piston skirt 2 experiences uneven stress. On the side closer to the combustion chamber, lateral forces are generated due to inertia and gas pressure. During the power stroke, the thrust of the combustion gases on the piston top is greater, resulting in a greater lateral force on the top of the piston skirt 2. Furthermore, the piston top 1 directly contacts the high-temperature combustion gases and has a higher temperature, while the piston skirt 2 has a lower temperature. Due to thermal expansion and contraction, the piston top 1 expands more, potentially causing tensile or compressive stress on the piston skirt 2. Due to the combined effect of lateral forces and thermal stress, the side of the piston skirt 2 closer to the combustion chamber is a high-stress area, while the side farther from the combustion chamber experiences less lateral force and thermal stress. However, under high-speed or high-load conditions, the bottom of the piston skirt 2 may also experience certain stress. Because the anti-wear layer 6 is relatively expensive, a structure with a gradually varying thickness is designed. The anti-wear layer 6 is thicker near the combustion chamber to ensure that there is enough anti-wear material in the high-stress area to withstand greater friction and impact. The anti-wear layer 6 is thinner at the bottom of the piston skirt 2, thereby optimizing material usage, ensuring sufficient anti-wear performance while reducing costs.

[0029] Example 3

[0030] like Figures 2-3 As shown, this utility model proposes a wear-resistant piston. Compared with Embodiment 1, this embodiment provides a detailed description of the cooling oil passage.

[0031] The outer sides of the two piston pin seats 3 are provided with oil-receiving grooves 7, and the bottom of the oil-receiving grooves 7 is provided with multiple oil inlet holes 8. The oil-receiving grooves 7 can hold some cooling oil, reduce the friction between the piston skirt 2 and the cylinder wall, and as the piston moves up and down, the cooling oil can continuously enter and exit through the oil inlet holes 8, which makes it easier to remove the heat generated by friction.

[0032] The inner edges of both ends of the center hole of the piston pin seat 3 are provided with oil-receiving chamfers 9. The oil-receiving chamfers 9 at the outer end can increase the amount of oil between the outer wall of the piston and the inner wall of the cylinder and reduce friction. The oil-receiving chamfers 9 at the inner end can reduce the friction between the piston connecting rod and the piston pin seat 3.

[0033] Cooling oil channels 10 are provided on the outer wall of the piston pin seat 3. The cooling oil channels 10 form two openings at the bottom of the piston skirt 2. The piston pin seat 3 is located in the area enclosed by the cooling oil channels 10. The cooling oil flows in the cooling oil channels 10, which can reduce friction and improve heat conduction and heat dissipation, thereby reducing the temperature of the piston. It can also reduce thermal friction caused by high temperature and further improve wear resistance.

[0034] A notch 11 is provided at the bottom of the piston skirt 2. The notch 11 helps the flow of cooling oil and makes it easier for the cooling oil to enter the gap between the piston and the cylinder wall.

[0035] In summary, when in use, the two skirts form a connecting structure, which enhances the overall structural strength of the piston skirt 2. The connection of the piston skirt 2 evenly distributes stress, reduces local stress concentration, and prevents deformation or breakage of the piston skirt 2 due to excessive stress. Anti-wear layers 6 are provided on both sides of the piston skirt, directly contacting the cylinder wall, significantly reducing wear between the piston and the cylinder wall. Especially during rapid piston movement, the anti-wear layer 6 can withstand greater friction and impact forces, effectively extending the piston's service life. Furthermore, the gradually varying thickness of the anti-wear layer 6 ensures effective anti-friction performance while reducing costs. The anti-wear layer 6 has a large contact area with the cylinder wall, preventing damage to the cylinder wall. The oil-receiving groove 7, cooling oil channel 10, and oil-receiving chamfer 9 further reduce friction and improve wear resistance.

[0036] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A wear-resistant piston, comprising a piston top (1), a piston skirt (2) disposed below the piston top (1), two piston pin seats (3) disposed on the piston skirt (2), and a plurality of annular sealing grooves (4) disposed on the outer circumferential surface of the piston top (1), characterized in that, Also includes: The mounting groove (5) is opened on the piston skirt (2) on both sides. From top to bottom, the horizontal distance between the mounting groove (5) and the cylinder wall gradually decreases. And an anti-wear layer (6), which is provided in two. The two anti-wear layers (6) are respectively set in two mounting grooves (5). From top to bottom, the thickness of the anti-wear layer (6) gradually decreases, and the outer circumferential surface of the anti-wear layer (6) matches the curvature of the cylinder inner wall.

2. The wear-resistant piston according to claim 1, characterized in that, The wear-resistant layer (6) is a DLC diamond carbon coating.

3. The wear-resistant piston according to claim 1, characterized in that, The outer side of the two piston pin seats (3) is provided with an oil-containing groove (7), and the bottom of the oil-containing groove (7) is provided with multiple oil inlet holes (8). The oil-containing groove (7) can hold a portion of the cooling oil.

4. The wear-resistant piston according to claim 1, characterized in that, Oil-receiving chamfers (9) are provided on the inner edges of both ends of the center hole of the piston pin seat (3).

5. A wear-resistant piston according to claim 1, characterized in that, A cooling oil channel (10) is provided on the outer wall of the piston pin seat (3). The cooling oil channel (10) forms two openings at the bottom of the piston skirt (2). The piston pin seat (3) is located in the area enclosed by the cooling oil channel (10).

6. The wear-resistant piston according to claim 1, characterized in that, The piston skirt (2) has a notch (11) at the bottom.

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