Piston and engine

Abstract

The invention discloses a piston and an engine, and relates to the technical field of engines, the piston comprises a piston main body, the piston main body extends in the vertical direction, a head part and a skirt part are sequentially formed in the extending direction of the piston main body, the head part is provided with an oil collecting area, an annular groove is formed in the oil collecting area, an oil return hole is formed in the annular groove, and the oil return hole is communicated with the annular groove; a cavity is defined by the skirt portion, the oil return hole is communicated with the cavity, two pin seats are arranged on the two opposite sides of the skirt portion in the second direction, the second direction is perpendicular to the first direction, pin holes communicated with the cavity are formed in the two pin seats, piston pins are inserted into the pin holes, and oil guide grooves are formed in the positions, corresponding to the pin holes, of the outer side wall of the skirt portion. One end of each oil guide groove is communicated with the annular groove, and the other end of each oil guide groove extends to be communicated with the corresponding pin hole. According to the piston, friction between the pin seat and the piston pin can be effectively reduced, abrasion between the pin seat and the piston pin is reduced, and the performance of an engine is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to a piston and an engine. Background Art

[0002] The piston is a core component of the engine, reciprocating within the cylinder to generate kinetic energy. The piston consists of a piston pin and a pin holder. The pin holder is located on the side of the piston and provides a mounting and support location for the piston pin. Because the piston reciprocates under high temperature and pressure, the pin holder and piston pin are susceptible to wear due to friction. This wear can further affect engine performance over time. Summary of the Invention

[0003] The main purpose of the present invention is to provide a piston and an engine, aiming to solve the technical problem that friction between the pin seat and the piston pin of the existing piston causes wear and tear, thereby affecting the performance of the engine.

[0004] To achieve the above-mentioned purpose, the present invention proposes a piston, which includes a piston body, the piston including a piston body and a piston pin, the piston body extending vertically, and sequentially formed with a head and a skirt along its extension direction, wherein the head is provided with an oil collecting area, an annular groove is formed in the oil collecting area, an oil return hole is provided in the annular groove, and the oil return hole is connected to the annular groove; the skirt is surrounded by a cavity, and the oil return hole is connected to the cavity, the skirt is provided with two pin seats on opposite sides along the longitudinal direction, both of the pin seats are provided with a pin hole connected to the cavity, the pin hole is used for the piston pin to be plugged in, and an oil guide groove is provided on the outer side wall of the skirt at the position corresponding to each pin hole, one end of the oil guide groove is connected to the annular groove, and the other end of the oil guide groove extends to be connected to the corresponding pin hole.

[0005] In one embodiment, the skirt includes two mounting portions arranged opposite to each other in the longitudinal direction and two connecting portions arranged opposite to each other in the transverse direction. The two mounting portions and the two connecting portions are connected end to end to form the skirt. The two pin seats are respectively arranged on the two mounting portions. The oil guide groove extends from the annular groove to the corresponding pin hole to communicate with the corresponding pin hole. The annular groove is provided with the oil return hole at the position corresponding to each of the connecting portions.

[0006] In one embodiment, an annular step is formed on the side of the head facing the skirt, and the annular step forms the bottom wall of the annular groove. A reinforcing rib is connected between the annular step and each of the mounting portions. The reinforcing rib extends from the bottom of the annular step to the position of the corresponding edge of the pin hole, and the reinforcing rib is inclined from the annular step to the mounting portion toward the cavity. An oil guide surface is formed on the side of the reinforcing rib away from the cavity, and an oil guide groove is provided on the oil guide surface.

[0007] In one embodiment, the oil guide surface is an arcuate surface recessed toward the cavity, a V-shaped opening is provided at the bottom of the annular step and is arranged outward, the oil guide groove is connected to the annular groove through the opening, and the groove wall of the oil guide groove is smoothly transitioned to the inner wall of the opening.

[0008] In one embodiment, a plurality of oil guide grooves are formed on each of the mounting portions, and the plurality of oil guide grooves on each of the mounting portions are communicated with the pin holes on the mounting portion.

[0009] In one embodiment, each of the pin holes is provided with two connecting points on opposite sides in the transverse direction, the two connecting points are arranged close to the head, the distances from the two connecting points to the bottom of the annular step are consistent, and the transverse spacing between the two connecting points is B, and the diameter of the pin hole is D; wherein 1 / 2D≤B≤D.

[0010] In one embodiment, an oil collecting groove is opened at a position of the groove bottom wall corresponding to the oil return hole, the oil collecting groove is recessed toward the skirt along the vertical direction, and the oil collecting groove is communicated with the oil return hole.

[0011] In one embodiment, a lubrication groove is provided on the inner wall of the pin hole along its circumference, and the lubrication groove is formed by being recessed outward from the inner wall of the pin hole; in the longitudinal direction, the lubrication groove is provided close to the oil guide groove.

[0012] In one embodiment, an oil storage groove is provided on the inner wall of the pin hole, and the oil storage groove is formed by being recessed outward from the inner wall of the pin hole. The oil storage groove is provided between the oil guide groove and the lubrication groove, and one end of the oil storage groove is connected to the lubrication groove. An oil drain port is formed on the pin seat, and the oil drain port is provided close to the oil storage groove, and the other end of the oil storage groove extends to be connected to the oil drain port.

[0013] The present invention also provides a piston, and the engine is applied with the piston.

[0014] The technical solution of the present invention comprises an annular groove formed on the piston head, which surrounds the piston head. The annular groove collects oil scraped from the cylinder wall during piston movement. The oil collected in the annular groove then enters the cavity through an oil return hole connected to the cavity, and from there returns to the bottom of the piston cylinder, thereby recovering the oil on the piston cylinder wall. An oil guide groove is formed on the skirt of the piston body, connecting the pin hole with the oil return groove. Some of the oil collected in the annular groove can flow through the oil guide groove into the pin hole to lubricate the piston pin inserted into the pin hole, thereby reducing friction between the piston pin and the pin seat, and further reducing wear on the piston pin and the pin seat, effectively ensuring engine performance. Furthermore, because the pin hole and the cavity are connected, the oil flowing into the pin hole can also be recovered through the cavity to the bottom of the piston cylinder, achieving both lubrication between the pin hole and the pin seat and oil recovery, a clever design. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0016] Figure 1 A schematic structural diagram of a piston body in one embodiment of the piston provided by the present invention at one viewing angle;

[0017] Figure 2 A schematic structural diagram of a piston body in an embodiment of the piston provided by the present invention from another perspective;

[0018] Figure 3 A schematic front view of a piston body in an embodiment of the piston provided by the present invention;

[0019] Figure 4 This is a side view schematic diagram of the piston body in one embodiment of the piston provided by the present invention.

[0020] Description of Figure Numbers:

[0021] 100. Piston body; 10. Head; 11. Oil collecting area; 111. Annular groove; 112. Oil return hole; 113. Oil collecting groove; 12. Annular step; 121. Opening; 20. Skirt; 21. Pin seat; 211. Pin hole; 212. Lubrication groove; 213. Oil storage tank; 22. Mounting part; 221. Connecting point; 23. Connecting part; 25. Reinforcing rib; 251. Oil guide surface; 26. Oil guide groove; 27. Cavity.

[0022] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0024] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0025] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0026] The piston is a core component of the engine, reciprocating within the cylinder to generate kinetic energy. The piston consists of a piston pin and a pin holder. The pin holder is located on the side of the piston and provides a mounting and support location for the piston pin. Because the piston reciprocates under high temperature and pressure, the pin holder and piston pin are susceptible to wear due to friction. This wear can further affect engine performance over time.

[0027] The present invention provides a piston.

[0028] See also Figures 1 to 4In one embodiment of the present invention, the piston includes a piston body 100 and a piston pin. The piston body 100 extends vertically and is sequentially formed with a head 10 and a skirt 20 along its extension direction. The head 10 is provided with an oil collecting area 11, an annular groove 111 is formed in the oil collecting area 11, and an oil return hole 112 is opened in the annular groove 111. The oil return hole 112 is connected to the annular groove 111; the skirt 20 is surrounded by a cavity 27, and the oil return hole 112 is connected to the annular groove 111. The skirt 20 is connected to the cavity 27 and is provided with two pin seats 21 on opposite sides along the longitudinal direction. Both of the pin seats 21 are provided with a pin hole 211 connected to the cavity 27. The pin holes 211 are used for the piston pin to be inserted. An oil guide groove 26 is provided on the outer wall of the skirt 20 at a position corresponding to each pin hole 211. One end of the oil guide groove 26 is connected to the annular groove 111, and the other end of the oil guide groove 26 extends to be connected to the corresponding pin hole 211.

[0029] Vertical Figure 1 The up and down directions in the horizontal direction are Figure 1 The left and right directions in the vertical direction are Figure 1 It should be noted that the piston pin is not shown in the figure.

[0030] The technical solution of the present invention is to form an annular groove 111 on the piston head 10. The annular groove 111 is arranged around the head 10 of the piston body 100. The annular groove 111 of the head 10 collects the oil scraped from the cylinder wall of the piston cylinder during piston movement. The oil collected in the annular groove 111 is then allowed to enter the cavity 27 through the oil return hole 112 connected to the cavity 27, and then return from the cavity 27 to the bottom of the piston cylinder, thereby completing the recovery of the oil on the piston cylinder wall. The skirt 20 of the piston body 100 is provided with an oil guide groove 26. The oil guide groove 26 connects the pin hole 211 with the oil return groove. Some of the oil collected in the annular groove 111 can flow through the oil guide groove 26 into the pin hole 211 to lubricate the piston pin inserted into the pin hole 211, thereby reducing the friction between the piston pin and the pin seat 21, and further reducing the wear of the piston pin and the pin seat 21, effectively ensuring the performance of the engine. And because the pin hole 211 and the cavity 27 are connected, the oil flowing into the pin hole 211 can also be recovered to the bottom of the piston cylinder through the cavity 27, thereby achieving lubrication between the pin hole 211 and the pin seat 21 and recovery of the oil, which is an ingenious design.

[0031] In one embodiment of the present invention, the skirt 20 includes two mounting portions 22 arranged opposite to each other in the longitudinal direction and two connecting portions 23 arranged opposite to each other in the transverse direction. The two mounting portions 22 and the two connecting portions 23 are connected end to end to form the skirt 20. Two pin seats 21 are respectively provided on the two mounting portions 22. The oil guide groove 26 extends from the annular groove 111 to the corresponding pin hole 211 to communicate with the corresponding pin hole 211. The annular groove 111 is provided with an oil return hole 112 at a position corresponding to each connecting portion 23.

[0032] Specifically, if Figure 3 and 4 As shown, the two mounting portions 22 are spaced apart in the front-to-back direction, and the two connecting portions 23 are spaced apart in the left-to-right direction. The two mounting portions 22 and the two connecting portions 23 are connected end to end to form a skirt 20. The two pin seats 21 are respectively provided on the two mounting portions 22, and the oil return hole 112 is provided at a position corresponding to the connecting portion 23 in the annular groove 111. Since the mounting portion 22 is provided with the pin seat 21, the structure of the mounting portion 22 is relatively weak. Setting the oil return hole 112 at a position corresponding to the connecting portion 23 can effectively avoid making the mounting portion 22 weaker, and can effectively ensure that the piston body 100 has good structural strength.

[0033] In one embodiment of the present invention, an annular step 12 is formed on the side of the head 10 facing the skirt 20. The annular step 12 forms the bottom wall of the annular groove 111. A reinforcing rib 25 is connected between the annular step 12 and each mounting portion 22. The reinforcing rib 25 extends from the bottom of the annular step 12 to the position of the edge of the corresponding pin hole 211, and the reinforcing rib 25 is inclined from the annular step 12 to the mounting portion 22 toward the cavity 27. An oil guide surface 251 is formed on the side of the reinforcing rib 25 away from the cavity 27, and the oil guide surface 251 is provided with an oil guide groove 26.

[0034] Specifically, if Figure 1 As shown, an annular step 12 is formed on the side of the head 10 facing the skirt 20. This annular step 12 forms the bottom wall of the annular groove 111. To further enhance the structural strength of the piston body 100, a reinforcing rib 25 is connected between the annular step 12 and each mounting portion 22. The reinforcing rib 25 extends from the bottom of the annular step 12 toward the edge of the corresponding pin hole 211. Furthermore, the reinforcing rib 25 is inclined from the annular step 12 toward the mounting portion 22 toward the cavity 27. The oil guide groove 26 is formed on the oil guide surface 251 of the reinforcing rib 25. The inclined reinforcing rib 25 further guides the oil in the oil guide groove 26, allowing the oil in the oil guide groove 26 to flow more smoothly into the pin hole 211.

[0035] In one embodiment of the present invention, the oil guide surface 251 is an arc-shaped surface recessed toward the cavity 27 , a V-shaped opening 121 is provided at the bottom of the annular step 12 , and the opening 121 is arranged outward. The oil guide groove 26 is connected to the annular groove 111 through the opening 121 , and the oil guide groove 26 and the annular groove 111 are smoothly transitioned to each other.

[0036] Furthermore, the oil-guiding surface 251 is an arcuate surface recessed toward the cavity 27. This arcuate surface allows the oil to flow more smoothly, effectively improving the oil-guiding efficiency and ensuring that sufficient oil reaches the pin hole 211 in a timely manner to fully lubricate the piston pin, thereby further reducing friction between the pin seat 21 and the piston pin, reducing wear and improving engine performance and reliability. The V-shaped opening 121 is positioned outward and communicates with the oil-guiding groove 26. This V-shaped opening 121 effectively increases the connection area between the annular groove 111 and the oil-guiding groove 26. Compared to openings 121 of other shapes, the V-shaped opening 121 provides a larger flow cross-section within the same space, allowing the oil to flow more smoothly between the annular groove 111 and the oil-guiding groove 26, thereby improving the oil delivery efficiency. As the piston moves upward, the oil collected in annular groove 111 is more quickly directed into oil guide groove 26, ensuring timely and sufficient oil delivery to pin hole 211 to lubricate the piston pin and preventing dry friction between pin seat 21 and the piston pin due to insufficient oil supply. The shape and orientation of V-shaped opening 121 clearly guide the flow of oil. With opening 121 facing outward and its connection to annular groove 111 and oil guide groove 26, oil naturally flows into oil guide groove 26, following the guidance of V-shaped opening 121, as it exits annular groove 111.

[0037] In one embodiment of the present invention, a plurality of oil guiding grooves 26 are defined on each mounting portion 22 , and the plurality of oil guiding grooves 26 on each mounting portion 22 are all communicated with the pin holes 211 on the mounting portion 22 .

[0038] Specifically, the design of multiple oil guide grooves 26 significantly increases the number of channels through which oil flows into pin hole 211, allowing oil to enter the interior of pin hole 211 more quickly and evenly. During piston movement, oil flows simultaneously from annular groove 111 through multiple oil guide grooves 26 to pin hole 211, forming multiple oil streams that lubricate the piston pin in all directions, significantly improving lubrication and extending the service life of the piston pin and pin seat 21.

[0039] In one embodiment of the present invention, each pin hole 211 is respectively provided with two connecting points 221 on opposite sides along the transverse direction. The two connecting points 221 are arranged close to the head 10. The distances between the two connecting points 221 and the bottom of the annular step 12 are consistent, and the transverse spacing between the two connecting points 221 is B. The diameter of the pin hole 211 is D; wherein 1 / 2D≤B≤D.

[0040] Specifically, the distance between the two connecting points 221 is B, the distance between the two connecting points 221 is greater than or equal to the radius of the pin hole 211, and the distance between the two connecting points 221 is less than or equal to the diameter of the pin hole 211. This can avoid the length of the oil guide groove 26 being too short, resulting in poor guiding effect on the engine oil, and can also avoid the length of the oil guide groove 26 being too long, resulting in loss of engine oil when flowing through the guide groove, ensuring that the engine oil can effectively flow into the pin hole 211 through the oil guide groove 26, ensuring the lubrication effect on the pin hole 211 and the piston pin.

[0041] In one embodiment of the present invention, an oil collecting groove 113 is formed on the bottom wall of the groove at a position corresponding to the oil return hole 112 . The oil collecting groove 113 is vertically recessed toward the skirt 20 and is communicated with the oil return hole 112 .

[0042] Specifically, if Figure 4 As shown, an oil collecting groove 113 is defined on the bottom wall of the annular groove 111. This groove 113 is vertically recessed toward the skirt 20. The oil collecting groove 113 is connected to the oil return hole 112, allowing engine oil to collect within the groove 113 and flow smoothly through the oil return hole 112 into the cavity 27 of the skirt 20. The oil collecting groove 113 effectively collects the oil within the annular groove 111 and directs it toward the oil return hole 112, improving oil recovery efficiency.

[0043] In one embodiment of the present invention, a lubrication groove 212 is provided along the circumference of the inner wall of the pin hole 211 . The lubrication groove 212 is formed by being recessed outward from the inner wall of the pin hole 211 . In the longitudinal direction, the lubrication groove 212 is provided close to the oil guide groove 26 .

[0044] Specifically, lubrication grooves 212 are one or more annular grooves formed outward from the inner wall of pin hole 211. These lubrication grooves 212 are positioned along the longitudinal direction of pin hole 211 near oil guide groove 26 to better receive and store the engine oil flowing from oil guide groove 26 into pin hole 211. Lubrication grooves 212 effectively maintain the engine oil within pin hole 211, ensuring that the piston pin remains well lubricated during its reciprocating motion.

[0045] In one embodiment of the present invention, an oil storage groove 213 is provided on the inner wall of the pin hole 211. The oil storage groove 213 is formed by being recessed outward from the inner wall of the pin hole 211. The oil storage groove 213 is provided between the oil guide groove 26 and the lubrication groove 212. One end of the oil storage groove 213 is connected to the lubrication groove 212. An oil drain port is formed on the pin seat 21. The oil drain port is provided close to the oil storage groove 213. The other end of the oil storage groove 213 extends to be connected to the oil drain port.

[0046] Furthermore, the oil storage tank 213 is arranged in the pin hole 211 to form an intermediate oil storage area, which can effectively store a certain amount of engine oil to supplement the engine oil in the lubrication groove 212, further improving the lubrication effect, and when the engine oil accumulates to a certain amount in the oil storage tank 213, it can be discharged through the oil drain port, and the other end of the oil storage tank 213 extends to communicate with the oil drain port, forming a complete engine oil flow and discharge path.

[0047] In one embodiment of the present invention, the oil collecting area 11 includes a plurality of annular grooves 111, which are arranged in sequence along the direction of the skirt 20 pointing toward the head 10. The oil return hole 112 is opened on the groove wall of the annular groove 111 closest to the skirt 20, and one end of the oil guide groove 26 is connected to the annular groove 111 closest to the skirt 20.

[0048] Specifically, as shown in the figure, the head is provided with three annular grooves 111. From top to bottom, the three annular grooves 111 are two air ring grooves and one oil ring groove. The air ring is the primary seal between the piston and the cylinder wall. During engine operation, the air ring is installed in the air ring groove. Under the action of the high-temperature and high-pressure gas in the cylinder, the air ring is pushed against the cylinder wall, forming a seal, maintaining the gas pressure in the cylinder body and ensuring the engine's power output. The oil ring groove is used to scrape and collect the oil on the cylinder wall, and then recover the oil through the oil return hole.

[0049] The present invention also proposes an engine, which is equipped with a piston. The specific structure of the piston refers to the above-mentioned embodiment. Since this engine adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0050] The above description is merely an exemplary embodiment of the present invention and does not limit the scope of protection of the present invention. Any equivalent structural transformation made by using the contents of the present invention description and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the scope of protection of the present invention.

Claims

1. A piston, characterized in that: The piston includes a piston body and a piston pin. The piston body extends vertically and is sequentially formed with a head and a skirt along its extension direction, wherein the head is provided with an oil collecting area, an annular groove is formed in the oil collecting area, an oil return hole is provided in the annular groove, and the oil return hole is communicated with the annular groove; the skirt is surrounded by a cavity, and the oil return hole is communicated with the cavity, and the skirt is provided with two pin seats on opposite sides along the longitudinal direction, and both pin seats are provided with a pin hole communicated with the cavity, and the pin hole is used for the piston pin to be plugged in, and an oil guide groove is provided on the outer side wall of the skirt at the position corresponding to each pin hole, one end of the oil guide groove is communicated with the annular groove, and the other end of the oil guide groove extends to be connected with the corresponding pin hole.

2. The piston according to claim 1, wherein The skirt includes two mounting portions arranged opposite to each other in the longitudinal direction and two connecting portions arranged opposite to each other in the transverse direction. The two mounting portions and the two connecting portions are connected end to end to form the skirt. The two pin seats are respectively arranged on the two mounting portions. The oil guide groove extends from the annular groove to the corresponding pin hole to communicate with the corresponding pin hole. The annular groove is provided with the oil return hole at the position corresponding to each of the connecting portions.

3. The piston according to claim 2, wherein An annular step is formed on the side of the head facing the skirt, and the annular step forms the bottom wall of the annular groove. A reinforcing rib is connected between the annular step and each of the mounting portions. The reinforcing rib extends from the bottom of the annular step to the position of the corresponding edge of the pin hole, and the reinforcing rib is inclined from the annular step to the mounting portion toward the cavity. An oil guide surface is formed on the side of the reinforcing rib away from the cavity, and an oil guide groove is provided on the oil guide surface.

4. The piston according to claim 3, wherein The oil guide surface is an arc-shaped surface recessed toward the cavity. A V-shaped opening facing outward is provided at the bottom of the annular step. The oil guide groove is connected to the annular groove through the opening. The groove wall of the oil guide groove is smoothly transitioned to the inner wall of the opening.

5. The piston according to claim 3, wherein A plurality of oil guide grooves are provided on each of the mounting parts, and the plurality of oil guide grooves on each of the mounting parts are communicated with the pin holes on the mounting part.

6. The piston according to claim 5, wherein Each pin hole is provided with two connecting points on opposite sides along the transverse direction, the two connecting points are arranged close to the head, the distances between the two connecting points and the bottom of the annular step are consistent, and the transverse spacing between the two connecting points is B, and the diameter of the pin hole is D; wherein 1 / 2D≤B≤D.

7. The piston according to claim 3, wherein: An oil collecting groove is provided at a position of the groove bottom wall corresponding to the oil return hole. The oil collecting groove is recessed toward the skirt along the vertical direction, and the oil collecting groove is communicated with the oil return hole.

8. The piston according to any one of claims 1 to 7, characterized in that The inner wall of the pin hole is provided with a lubrication groove along its circumference, and the lubrication groove is formed by being recessed outward from the inner wall of the pin hole; in the longitudinal direction, the lubrication groove is provided close to the oil guide groove.

9. The piston according to claim 8, wherein An oil storage groove is provided on the inner wall of the pin hole, and the oil storage groove is formed by being recessed outward from the inner wall of the pin hole. The oil storage groove is arranged between the oil guide groove and the lubrication groove, and one end of the oil storage groove is communicated with the lubrication groove. An oil drain port is formed on the pin seat, and the oil drain port is arranged close to the oil storage groove. The other end of the oil storage groove extends to be communicated with the oil drain port.

10. An engine, characterized in that: The engine is applied with the piston according to any one of claims 1 to 9.

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