Engine piston

Abstract

The utility model discloses an engine piston which comprises an inner cooling oil channel, the inner cooling oil channel is annularly arranged in the engine piston, the inner cooling oil channel comprises a bottom wall, and the bottom wall is arranged on the side, close to a pin hole, of the inner cooling oil channel; the top wall is arranged on the side, away from the pin hole, of the inner cooling oil duct, and the top wall and the bottom wall are oppositely arranged; the two side walls are connected between the bottom wall and the top wall, one side wall comprises a plurality of first arc sections and a plurality of second arc sections, the first arc sections are circular arcs protruding towards the outside of the inner cooling oil channel, the second arc sections are circular arcs recessed towards the inside of the inner cooling oil channel, and the first arc sections and the second arc sections are sequentially arranged in a staggered mode. The multiple first arc sections and the multiple second arc sections are sequentially arranged in the height direction in a staggered mode, the heat dissipation area of the inner cooling oil channel and cooling oil is increased, wave vibration can be generated when the cooling oil flows in the inner cooling oil channel, and the cooling efficiency of the cooling oil is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to an engine piston. Background Art

[0002] With the development of society and the advancement of science and technology, environmental protection requirements are becoming more and more stringent. In order to meet the needs of market applications, the power of diesel engines is constantly increasing, and emission requirements are gradually becoming stricter. The resulting problem is that the temperature of the piston is getting higher and higher, and the NOx limit of the engine emission is getting lower and lower. For the engine, the impact of the piston on the engine's power performance and emissions is crucial. Therefore, if diesel engines want to be competitive in the market, it is urgent to develop low-emission, high-efficiency and environmentally friendly engines.

[0003] In the related technology, the heat dissipation capacity of the internal cooling oil channel is limited. Under the operating conditions of high performance and high explosion pressure of the engine, the piston is at risk of cracking and burning failure, and its service life will be reduced. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes an engine piston, wherein a plurality of first arc segments and a plurality of second arc segments are arranged alternately in sequence along the height direction, so as to increase the heat dissipation area of ​​the inner cooling oil channel and the cooling oil, and the cooling oil generates wave vibration when flowing in the inner cooling oil channel, thereby improving the cooling efficiency of the cooling oil.

[0005] According to the engine piston of the first aspect of the utility model, the inner cooling oil passage is arranged in an annular shape in the engine piston, and the inner cooling oil passage comprises: a bottom wall, the bottom wall is arranged on the side of the inner cooling oil passage close to the pin hole; a top wall, the top wall is arranged on the side of the inner cooling oil passage away from the pin hole, and the top wall and the bottom wall are arranged opposite to each other; two side walls, the two side walls are connected between the bottom wall and the top wall, and one of the side walls comprises: a plurality of first arc segments and a plurality of second arc segments, the first arc segment is a circular arc convex to the outside of the inner cooling oil passage, and the second arc segment is a circular arc concave to the inside of the inner cooling oil passage, and the plurality of the first arc segments and the plurality of the second arc segments are arranged alternately in sequence.

[0006] According to the engine piston of the embodiment of the utility model, multiple first arc segments and multiple second arc segments are alternately arranged in the height direction, thereby increasing the heat dissipation area of ​​the inner cooling oil channel and the cooling oil. When the cooling oil flows in the inner cooling oil channel, wave vibration will be generated, thereby improving the cooling efficiency of the cooling oil.

[0007] According to some embodiments of the present invention, the radius of the first arc segment is r1, and r1 satisfies the relationship: 2.5mm≤r1≤3.5mm.

[0008] According to some embodiments of the present invention, the radius of the second arc segment is r2, and r2 satisfies the relationship: 1.5mm≤r2≤2.5mm.

[0009] According to some embodiments of the present invention, the top wall includes: a third arc segment, the radius of the third arc segment is r3, and r3 satisfies the relationship: 37.5mm≤r3≤38.5mm.

[0010] According to some embodiments of the utility model, a pin hole is provided on the engine piston, and a plane passing through the center of the pin hole and perpendicular to the central axis of the engine piston is set as a reference plane, and the distance between the center of the third arc segment and the reference plane is H1, and H1 satisfies the relationship: 75.3mm≤H1≤76.3mm;

[0011] The distance between the center of the third arc segment and the central axis is H2, and H2 satisfies the relationship: 14.5mm≤H2≤15.5mm.

[0012] According to some embodiments of the present invention, another of the side walls includes: a fourth arc segment, the radius of the fourth arc segment is r4, and r4 satisfies the relationship: 7.1mm≤r4≤8.1mm.

[0013] According to some embodiments of the utility model, a pin hole is provided on the engine piston, and a plane passing through the center of the pin hole and perpendicular to the central axis of the engine piston is assumed to be a reference plane, and the distance between the center of the fourth arc segment and the reference plane is H3, and H3 satisfies the relationship: 37.5mm≤H3≤38.5mm; the distance between the center of the fourth arc segment and the central axis is H4, and H4 satisfies the relationship: 17.3mm≤H4≤18.3mm.

[0014] According to some embodiments of the present invention, the length of the bottom wall is L, and L satisfies the relationship: 11.5mm≤L≤12.5mm.

[0015] According to some embodiments of the present invention, the connection between the bottom wall and the side wall is connected by a first rounded corner; and / or, the connection between the top wall and the side wall is connected by a second rounded corner.

[0016] According to some embodiments of the utility model, the engine piston includes: a piston top, the piston top is provided with a combustion chamber, and the combustion chamber is used to burn fuel; a piston head, the piston head is provided with the internal cooling oil channel; and a piston skirt is provided with a pin seat and the pin hole.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 It is a structural schematic diagram of an engine piston according to an embodiment of the utility model;

[0020] Figure 2 is an annotated diagram of an engine piston according to an embodiment of the utility model;

[0021] Figure 3 is an overall schematic diagram of an internal cooling oil passage according to an embodiment of the utility model;

[0022] Figure 4 It is a bottom view of the internal cooling oil channel according to an embodiment of the utility model;

[0023] Figure 5 yes Figure 4 A partial schematic diagram of AA;

[0024] Figure 6 It is a cross-sectional view of an internal cooling oil channel according to an embodiment of the utility model.

[0025] Reference numerals:

[0026] 100. Engine piston;

[0027] 10. Piston head; 11. Internal cooling oil channel; 111. Bottom wall; 112. Top wall; 113. Side wall; 114. First arc segment; 115. Second arc segment; 116. Third arc segment; 117. Fourth arc segment; 118. Oil inlet; 19. Oil outlet;

[0028] 20. Piston top; 21. Combustion chamber;

[0029] 30. Piston skirt; 31. Pin hole. DETAILED DESCRIPTION

[0030] The embodiments of the present utility model are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present utility model are described in detail below.

[0031] Reference below Figure 1-Figure 6 An engine piston 100 according to an embodiment of the present invention is described.

[0032] like Figure 3-Figure 5As shown, an internal cooling oil passage 11 is provided in the engine piston 100, and the internal cooling oil passage 11 is in a circular shape, and includes: an oil inlet 118 and an oil outlet 119, which are arranged opposite to each other, and the oil inlet 118 and the oil outlet 119 divide the internal cooling oil passage 11 into two semicircular rings, so that after the cooling oil flows into the internal cooling oil passage 11 from the oil inlet 118, it is divided into two parts, one part flows from one of the semicircular rings to the oil outlet, and the other part flows from the other semicircular ring to the oil outlet 119, and then flows out from the oil outlet 119, so as to realize the circulation of the cooling oil in the internal cooling oil passage 11. Thus, the cooling oil can evenly dissipate the heat of the engine piston 100.

[0033] The internal cooling oil channel 11 includes: a bottom wall 111, a top wall 112 and two side walls 113. The bottom wall 111 is arranged on the side of the internal cooling oil channel 11 close to the pin hole 31, and the top wall 112 is arranged on the side of the internal cooling oil channel 11 away from the pin hole 31. The top wall 112 and the bottom wall 111 are arranged opposite to each other; the two side walls 113 are connected between the bottom wall 111 and the top wall 112, and the bottom wall 111, the top wall 112 and the two side walls 113 are arranged to form the internal cooling oil channel 11 through which cooling oil can flow.

[0034] like Figure 2-Figure 6 As shown, one of the side walls 113 includes: a plurality of first arc segments 114 and a plurality of second arc segments 115, the first arc segment 114 is a circular arc convex to the outside of the inner cooling oil channel 11, the second arc segment 115 is a circular arc concave to the inside of the inner cooling oil channel 11, and the plurality of first arc segments 114 and the plurality of second arc segments 115 are arranged alternately in sequence. Specifically, one of the side walls 113 is connected between one end of the top wall 112 and one end of the bottom wall 111, and one of the side walls 113 includes: a plurality of first arc segments 114 and a plurality of second arc segments 115, the first arc segment 114 convex to the outside of the inner cooling oil channel 11, the second arc segment 115 concave to the inside of the inner cooling oil channel 11, and from top to bottom, the first arc segment 114 and the second arc segment 115 are arranged alternately.

[0035] One end of the first arc segment 114 or one end of the second arc segment 115 at the end of one of the side walls 113 is connected to one end of the top wall 112 and the bottom wall 111, the other end of the first arc segment 114 at the end of one of the side walls 113 is connected to the adjacent second arc segment 115, the other end of the second arc segment 115 at the end of one of the side walls 113 is connected to the adjacent first arc segment 114, and the first arc segments 114 other than the first arc segment 114 at the end of one of the side walls 113 are connected between two adjacent second arc segments 115, The second arc segments 115 on one of the side walls 113 except the second arc segment 115 at the end are connected between the two adjacent first arc segments 114, that is, the first arc segments 114 and the second arc segments 115 on one of the side walls 113 are adjacent to each other and staggered in sequence, so that one of the side walls 113 is wavy in the height direction, increasing the surface area of ​​one of the side walls 113, thereby increasing the heat dissipation area of ​​the internal cooling oil channel 11 and the cooling oil, and improving the heat dissipation efficiency. When the cooling oil flows in the internal cooling oil channel 11, wave vibration will be generated, thereby improving the cooling efficiency of the cooling oil.

[0036] The second arc segment 115 connects two adjacent first arc segments 114, so that the two adjacent first arc segments 114 have a smooth transition. The second arc segment 115 further increases the surface area of ​​one of the side walls 113, thereby increasing the heat dissipation area of ​​the inner cooling oil channel 11 and the cooling oil, and improving the heat dissipation efficiency. When the cooling oil flows in the inner cooling oil channel 11, wave vibration will be generated, thereby improving the cooling efficiency of the cooling oil.

[0037] Therefore, the multiple first arc segments 114 and the multiple second arc segments 115 are alternately arranged in the height direction, increasing the heat dissipation area of ​​the inner cooling oil channel 11 and the cooling oil. When the cooling oil flows in the inner cooling oil channel 11, wave vibration will be generated, thereby improving the cooling efficiency of the cooling oil.

[0038] like Figure 2 As shown, the radius of the first arc segment 114 is r1, and r1 satisfies the relationship: 2.5mm≤r1≤3.5mm. Specifically, the radius of the first arc segment 114 is between 2.5mm and 3.5mm, and the curvature of the first arc segment 114 is ensured, and the surface area of ​​one of the side walls 113 is increased, thereby increasing the heat dissipation area of ​​the inner cooling oil channel 11 and the cooling oil, and improving the heat dissipation efficiency. When the cooling oil flows in the inner cooling oil channel 11, wave vibration will be generated, and the cooling efficiency of the cooling oil will be improved.

[0039] Furthermore, the radius of the second arc segment 115 is r2, and r2 satisfies the relationship: 1.5mm≤r2≤2.5mm. Specifically, the radius of the second arc segment 115 is between 1.5mm and 2.5mm, and the second arc segment 115 can connect two adjacent first arc segments 114. The radius of the second arc segment 115 is less than or equal to the radius of the first arc segment 114. The second arc segment 115 plays a transition role, increases the heat dissipation area of ​​the inner cooling oil channel 11 and the cooling oil, and improves the heat dissipation efficiency. When the cooling oil flows in the inner cooling oil channel 11, wave vibration will be generated, thereby improving the cooling efficiency of the cooling oil.

[0040] Reference Figure 2 , Figure 5 and Figure 6 As shown, the top wall 112 includes: a third arc segment 116, the radius of the third arc segment 116 is r3, and r3 satisfies the relationship: 37.5mm≤r3≤38.5mm. Specifically, the top wall 112 includes: a third arc segment 116, the third arc segment 116 is a circular arc, the third arc segment 116 can connect the two side walls 113, the radius of the third arc segment 116 ranges from 37.5mm to 38.5mm, and the curvature of the third arc segment 116 is small, which plays the role of connecting the two side walls 113.

[0041] Two pin holes 31 are disposed on the engine piston 100 . The two pin holes 31 are disposed opposite to each other. The center line connecting the two pin holes 31 is the pin hole axis. The pin hole axis is perpendicular to the center axis of the engine piston 100 .

[0042] The central axis of the engine piston 100 is Figure 2 A in.

[0043] The plane passing through the pin hole axis and perpendicular to the central axis of the engine piston 100 is the reference plane. Figure 2 B in.

[0044] The distance between the center of the third arc segment 116 and the reference plane is H1, and H1 satisfies the relationship: 75.3mm≤H1≤76.3mm. The distance between the center of the third arc segment 116 and the central axis is H2, and H2 satisfies the relationship: 14.5mm≤H2≤15.5mm. With the reference plane and the central axis as reference, the interval where the center of the third arc segment 116 is located is determined according to the range of H1 and H2, and a certain point is selected as the center of the third arc segment 116; then the radius value of the third arc segment 116 is selected, and a circle C (not shown in the drawings) is drawn according to the radius of the third arc segment 116.

[0045] Furthermore, the other side wall 113 includes: a fourth arc segment 117, the radius of the fourth arc segment 117 is r4, and r4 satisfies the relationship: 7.1mm≤r4≤8.1mm. Specifically, the fourth arc segment 117 connects the top wall 112 and the bottom wall 111. The fourth arc segment 117 can be an arc, and the radius of the fourth arc segment 117 ranges from 7.1mm to 8.1mm. The curvature of the fourth arc segment 117 is relatively large, and the fourth arc segment 117 is arranged opposite to the combustion chamber 21.

[0046] Combination Figure 2 As shown, the distance between the center of the fourth arc segment 117 and the reference plane is H3, and H3 satisfies the relationship: 37.5mm≤H3≤38.5mm; the distance between the center of the fourth arc segment 117 and the central axis is H4, and H4 satisfies the relationship: 17.3mm≤H4≤18.3mm. In other words, with the reference plane and the central axis as reference, the interval where the center of the fourth arc segment 117 is located is determined according to the range of H3 and H4, and a certain point is selected as the center of the fourth arc segment 117; then a circle D is drawn according to the radius r4 of the fourth arc segment 117 (not shown in the drawings), and the intersection of the circle C and the circle D is the intersection of the third arc segment 116 and the fourth arc segment 117, that is, the connection point between the bottom wall 111 and the other side.

[0047] like Figure 2 As shown, the length of the bottom wall 111 is L, and L satisfies the relationship: 11.5mm≤L≤12.5mm. Specifically, the length of the bottom wall 111 ranges from 11.5mm to 12.5mm, and the bottom wall 111 is connected to the two side walls 113 at both ends of the bottom wall 111. The distance between the bottom wall 111 and the inner cavity of the piston has certain requirements according to the structure of the piston. On the basis of satisfying the distance requirements between the bottom wall 111 and the inner cavity of the piston, a value is selected between 11.5mm and 12.5mm as the length of the bottom wall 111, and one end of the bottom wall 111 is connected to the other side wall 113. The connection point between the bottom wall 111 and the other side wall 113 is first determined, and this is used as the starting point. Then, the other point of the bottom wall 111 is determined based on the length of the bottom wall 111, thereby determining the position of one of the side walls 113.

[0048] In some embodiments, the connection between the bottom wall 111 and the side wall 113 is connected by a first fillet. That is, the connection between the bottom wall 111 and the two side walls 113 is transitioned by the first fillet, so that the connection between the bottom wall 111 and the two side walls 113 is smoothly transitioned, which is convenient for the process molding of the internal cooling oil channel 11.

[0049] In some other embodiments, the connection between the top wall 112 and the side wall 113 is connected by a second fillet, and the connection between one end of the top wall 112 and the other side wall 113 adopts a second fillet transition, that is, the connection between the top wall 112 and the other side wall 113 has a smooth transition; the other end of the top wall 112 and one of the side walls 113 can be connected by a first arc segment 114, so that the connection between the top wall 112 and one of the side walls 113 has a smooth transition, which is convenient for the process molding of the internal cooling oil channel 11.

[0050] like Figure 1 and Figure 2 As shown, the engine piston 100 includes a piston top 20 , a piston head 10 and a piston skirt 30 .

[0051] The piston top 20 is provided with a combustion chamber 21, and the combustion chamber 21 is used to burn the fuel. The combustion chamber 21 is one of the main functional structures of the engine piston 100, and plays the function of allowing the fuel to burn fully.

[0052] like Figure 1 and Figure 2 As shown, an internal cooling oil channel 11 is provided in the piston head 10. The internal cooling oil channel 11 is arranged in a ring shape in the piston head 10. The cooling oil enters from the oil inlet of the internal cooling oil channel 11. After flowing through the annular internal cooling oil channel 11, the cooling oil is dissipated to the peripheral side of the engine piston 100 to cool the engine piston 100.

[0053] The piston head 10 is provided with piston ring grooves around it, and the piston ring grooves are used to install the piston ring assembly. Usually, the piston ring assembly includes an oil ring and an air ring. The oil ring is used to scrape off the carbon deposits generated during the operation of the piston and prevent the oil from being sucked back. In this embodiment, the piston ring assembly is provided with three rings, two air rings and one oil ring, which are respectively defined as the first ring (air ring), the second ring (air ring) and the third ring (oil ring). The first ring, the second ring and the third ring are installed on the piston ring groove from top to bottom in sequence. The first ring, the second ring and the third ring are provided with openings, and the openings can prevent the expansion of each ring during the working process from causing damage to the piston.

[0054] The piston skirt 30 is provided with a pin seat and a pin hole 31. The pin hole 31 is used to fit the piston pin. The piston pin is placed in the pin hole 31 to fix the connecting rod, so that the engine piston 100 drives the connecting rod to transfer kinetic energy to the engine crankshaft.

[0055] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0057] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An engine piston (100), characterized in that: include: An internal cooling oil passage (11), the internal cooling oil passage (11) being arranged in an annular shape inside the engine piston (100), the internal cooling oil passage (11) comprising: A bottom wall (111), the bottom wall (111) being arranged on a side of the internal cooling oil passage (11) close to the pin hole (31); A top wall (112), the top wall (112) being arranged on a side of the internal cooling oil channel (11) away from the pin hole (31), the top wall (112) and the bottom wall (111) being arranged opposite to each other; Two side walls (113), the two side walls (113) are connected between the bottom wall (111) and the top wall (112), one of the side walls (113) comprises: a plurality of first arc segments (114) and a plurality of second arc segments (115), the first arc segments (114) are circular arcs protruding outwardly from the inner cooling oil channel (11), the second arc segments (115) are circular arcs recessed into the inner cooling oil channel (11), and the plurality of first arc segments (114) and the plurality of second arc segments (115) are arranged alternately in sequence.

2. The engine piston (100) according to claim 1, characterized in that: The radius of the first arc segment (114) is r1, and r1 satisfies the relationship: 2.5 mm≤r1≤3.5 mm.

3. The engine piston (100) according to claim 1, characterized in that: The radius of the second arc segment (115) is r2, and r2 satisfies the relationship: 1.5 mm≤r2≤2.5 mm.

4. The engine piston (100) according to claim 1, characterized in that: The top wall (112) comprises: a third arc segment (116), the radius of the third arc segment (116) is r3, and r3 satisfies the relationship: 37.5 mm≤r3≤38.5 mm.

5. The engine piston (100) according to claim 4, characterized in that: The engine piston (100) is provided with a pin hole (31), and a plane passing through the center of the pin hole (31) and perpendicular to the central axis of the engine piston (100) is assumed to be a reference plane, and the distance between the center of the third arc segment (116) and the reference plane is H1, and H1 satisfies the relationship: 75.3 mm ≤ H1 ≤ 76.3 mm; The distance between the center of the third arc segment (116) and the central axis is H2, and H2 satisfies the relationship: 14.5mm≤H2≤15.5mm.

6. The engine piston (100) according to claim 1, characterized in that: The other side wall (113) comprises: a fourth arc segment (117), the radius of the fourth arc segment (117) is r4, and r4 satisfies the relationship: 7.1mm≤r4≤8.1mm.

7. The engine piston (100) according to claim 6, characterized in that: The engine piston (100) is provided with a pin hole (31), and a plane passing through the center of the pin hole (31) and perpendicular to the central axis of the engine piston (100) is assumed to be a reference plane, and the distance between the center of the fourth arc segment (117) and the reference plane is H3, and H3 satisfies the relationship: 37.5 mm ≤ H3 ≤ 38.5 mm; The distance between the center of the fourth arc segment (117) and the central axis is H4, and H4 satisfies the relationship: 17.3mm≤H4≤18.3mm.

8. The engine piston (100) according to claim 1, characterized in that: The length of the bottom wall (111) is L, and L satisfies the relationship: 11.5 mm ≤ L ≤ 12.5 mm.

9. The engine piston (100) according to claim 1, characterized in that: The connection between the bottom wall (111) and the side wall (113) is connected via a first fillet; and / or, The connection between the top wall (112) and the side wall (113) is connected via a second fillet.

10. The engine piston (100) according to claim 1, characterized in that include: A piston top (20), wherein the piston top (20) is provided with a combustion chamber (21), and the combustion chamber (21) is used to burn fuel; A piston head (10), wherein the inner cooling oil passage (11) is arranged in the piston head (10); The piston skirt (30) is provided with a pin seat and a pin hole (31).

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