Piston for diesel internal combustion engine
By designing a diesel internal combustion engine piston with a detachable structure, the problem of the traditional piston being scrapped as a whole was solved, achieving the effect of reducing costs and resource waste.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-30
- Publication Date
- 2026-03-03
AI Technical Summary
The piston of a traditional diesel internal combustion engine is a single piece, which means that the entire piston needs to be scrapped when it wears out, increasing the cost of use and wasting resources.
The diesel internal combustion engine piston is designed as a detachable structure, including a piston head and a skirt. Through the cooperation of the base, positioning part, cross plate, fixing column and fixing bolt, the piston head and skirt can be separated, and only the damaged part needs to be replaced.
This reduces the cost of piston use, minimizes resource waste, and improves the efficiency of recycling good resources.
Smart Images
Figure CN223964529U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of internal combustion engine piston technology, specifically to a piston for a diesel internal combustion engine. Background Technology
[0002] A diesel internal combustion engine is a type of power machinery that converts the heat energy released from the combustion of fuel inside the engine into power. The term "internal combustion engine" usually refers to a piston-type internal combustion engine, which was previously the most common type. In a piston-type internal combustion engine, fuel and air are mixed and burned inside the cylinder. The released heat energy generates high-temperature, high-pressure combustion gases within the cylinder. These gases expand, pushing the piston to do work. The mechanical work is then output through a crankshaft and connecting rod mechanism or other mechanisms, driving the driven machinery. The piston is a crucial component in a piston-type internal combustion engine. The basic structure of a piston can be divided into the top, head, and skirt. The piston top is the main part that makes up the combustion chamber. However, traditional internal combustion engine pistons are often integrated. Therefore, when the outer surface of the piston head or piston skirt wears down, the entire piston needs to be scrapped and replaced with a new one, significantly increasing the cost of piston use and increasing resource waste. Utility Model Content
[0003] To overcome the shortcomings of the existing technology, a piston for a diesel internal combustion engine is provided to solve the problems mentioned in the background art.
[0004] To achieve the above objectives, a piston for a diesel internal combustion engine is provided, comprising: a piston head, wherein the outer surface of the piston head is movably connected to a compression ring and an oil ring respectively through an annular groove, and a valve groove is formed on the piston top located on the upper surface of the piston head, and a fixing post is fixedly connected to the top of the inner cavity of the piston head, and a fitting groove is formed on the lower surface of the piston head, and the upper end of the piston skirt is movably connected to the fitting groove. The piston skirt is composed of a base, a guide, and a cross plate, the guide is fixedly connected to the outer surface of the base, and a positioning part is symmetrically connected to the upper end of the outer surface of the base, pin holes are symmetrically formed in the middle of the outer surface of the base, and a cross plate is fixedly connected to the upper end of the inner cavity of the base, and a fixing groove is formed on the upper surface of the cross plate relative to the position of the fixing post, and the fixing post is fixedly connected to the fixing groove by a fixing bolt.
[0005] Preferably, the valve groove on the top of the piston has a circular structure, the opening at the upper end of the valve groove is cylindrical, and the bottom of the inner cavity of the valve groove has a spherical structure.
[0006] Preferably, three sets of annular grooves are equally spaced along the axial direction on the outer side of the piston head. Multiple sets of through holes are equally spaced around the annular groove at the lower end of the piston head in the circumferential direction. The through holes connect to the inner cavity of the piston head. At the same time, the oil ring is movably connected in the annular groove with the through holes. A set of gas rings is movably connected in the other two sets of annular grooves. A set of positioning blocks is fixedly connected in each of the three sets of annular grooves. The positioning blocks have a square structure and the three sets of positioning blocks are equally spaced in the horizontal plane.
[0007] Preferably, the fitting groove on the lower surface of the piston head has a cylindrical structure, and the dimensions of the fitting groove and the outer side of the upper end of the base are matched. Two sets of positioning grooves are symmetrically opened on both sides of the fitting groove, and both sets of positioning grooves have a semi-cylindrical structure.
[0008] Preferably, the fixing post fixedly connected to the inner cavity of the piston head has a cylindrical structure, the end face of the fixing post has an elliptical structure, and the lower surface of the fixing post has a screw hole. The lower end of the fixing post and the fixing groove are matched in size, and the cross plate has a rectangular structure.
[0009] Preferably, the base has a cylindrical structure, the outer diameter of the upper end of the base is larger than the diameter of the inner cavity of the piston head, and the upper end of the outer side of the base is connected to the positioning part relative to the positioning groove, and the line connecting the centers of the two sets of positioning parts is perpendicular to the horizontal plate.
[0010] Preferably, the two sets of guides fixedly connected to the outer side of the base are both annular structures, and the outer diameter of the guide is equal to the diameter of the outer side of the piston head. At the same time, the guide at the upper end of the outer side of the base fits against the lower surface of the piston head.
[0011] Compared with the prior art, the beneficial effects of this utility model are: through the cooperation of the base, positioning part, cross plate, fixing column and fixing bolt, the piston head and piston skirt of the piston can form a detachable structure. Then, when wear occurs on the outer surface of the piston head or piston skirt, the corresponding parts only need to be disassembled and scrapped. This can reduce the use cost of the piston, reduce the waste rate of resources, and help improve the recycling effect of intact resources. Attached Figure Description
[0012] Figure 1 This is a front view of an embodiment of the present utility model.
[0013] Figure 2 This is a front view structural diagram of an embodiment of the present utility model.
[0014] Figure 3 This is a top view of the piston head according to an embodiment of the present invention.
[0015] Figure 4 This is a top view of the piston skirt in an embodiment of the present invention.
[0016] In the diagram: 1. Piston top; 2. Piston head; 3. Piston skirt; 4. Pin hole; 5. Guide part; 6. Oil ring; 7. Positioning block; 8. Compression ring; 9. Base; 10. Ring groove; 11. Positioning part; 12. Valve groove; 13. Fixing bolt; 14. Horizontal plate; 15. Fixing post; 16. Fitting groove. Detailed Implementation
[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0018] Reference Figures 1 to 4 As shown, this utility model provides a piston for a diesel internal combustion engine, including: a piston head 2, the outer side of which is movably connected to a compression ring 8 and an oil ring 6 via an annular groove 10, a valve groove 12 is provided on the piston top 1 located on the upper surface of the piston head 2, and a fixing post 15 is fixedly connected to the top of the inner cavity of the piston head 2. A fitting groove 16 is provided on the lower surface of the piston head 2, and the upper end of the piston skirt 3 is movably connected in the fitting groove 16. The piston skirt 3 is composed of a base 9, a guide 5, and a cross plate 14. The guide 5 is fixedly connected to the outer side of the base 9, and a positioning part 11 is symmetrically connected to the upper end of the outer side of the base 9. Pin holes 4 are symmetrically provided in the middle of the outer side of the base 9, and the cross plate 14 is fixedly connected to the upper end of the inner cavity of the base 9. A fixing groove is provided on the upper surface of the cross plate 14 relative to the position of the fixing post 15, and the fixing post 15 is fixedly connected in the fixing groove by a fixing bolt 13.
[0019] In this embodiment, when the piston of the diesel internal combustion engine is damaged, the worker first determines which part of the piston is damaged through disassembly and inspection. Then, the retaining bolt 13 is removed, and the fixed connection between the cross plate 14 and the retaining post 15 is released. This allows for the quick separation of the piston head 2 and the piston skirt 3. The damaged piston head 2 or piston skirt 3 is scrapped, and the corresponding new part is taken out, ensuring that both the piston head 2 and piston skirt 3 to be assembled are in good condition. Afterward, the upper end of the piston skirt 3 is inserted into the lower surface of the piston head 2. The piston head 2 and piston skirt 3 are fixedly connected in the fitting groove 16. At the same time, the positioning part 11 of the piston skirt 3 is embedded in the positioning groove, and the lower end of the fixing post 15 can also be smoothly embedded in the fixing groove. A through hole is opened at the bottom of the fixing groove relative to the screw hole. The fixing bolt 13 is screwed into the screw hole through the through hole, so that the fixing post 15 and the cross plate 14 are fixedly connected. The piston head 2 and piston skirt 3 can be fixedly connected. Then the piston can be reused, and the piston usage cost can be effectively reduced. It can also reduce the waste rate of resources and improve the recycling efficiency of intact resources.
[0020] In a preferred embodiment, the valve groove 12 on the piston top 1 is circular in shape, the opening at the upper end of the valve groove 12 is cylindrical, and the bottom of the inner cavity of the valve groove 12 is spherical.
[0021] In this embodiment, as Figure 2 The opening of the valve recess 12 on the top of the piston can help improve the combustion effect in the combustion chamber, thereby helping to enhance the thrust when the piston moves, and ensuring the overall performance of the diesel internal combustion engine.
[0022] In a preferred embodiment, three sets of annular grooves 10 are equally spaced along the axial direction on the outer side of the piston head 2. Multiple sets of through holes are equally spaced around the annular groove 10 at the lower end of the piston head 2. The through holes connect to the inner cavity of the piston head 2. At the same time, the oil ring 6 is movably connected in the annular groove 10 with the through holes. A set of gas rings 8 are movably connected in the other two sets of annular grooves 10. A set of positioning blocks 7 are fixedly connected in the three sets of annular grooves 10. The positioning blocks 7 have a square structure and the three sets of positioning blocks 7 are equally spaced in the horizontal plane.
[0023] In this embodiment, as Figure 1 , Figure 2 and Figure 3 The setting of the compression ring 8 and the oil ring 6 can help enhance the sealing performance at the connection between the piston head 2 and the cylinder wall. At the same time, the setting of the positioning block 7 can effectively limit the movement angle of the compression ring 8 and the oil ring 6, ensuring that the notches of the two sets of compression rings 8 and the set of oil rings 6 are not collinear, thus helping to enhance the sealing effect of the piston head 2 during use.
[0024] In a preferred embodiment, the fitting groove 16 on the lower surface of the piston head 2 has a cylindrical structure, and the dimensions of the fitting groove 16 and the outer side of the upper end of the base 9 are matched. Two sets of positioning grooves are symmetrically opened on both sides of the fitting groove 16, and both sets of positioning grooves have a semi-cylindrical structure.
[0025] In this embodiment, as Figure 2 and Figure 3 The dimensions of the fitting groove 16 and the upper end of the base 9 are adapted to each other, thereby helping to enhance the stability of the connection between the piston head 2 and the piston skirt 3.
[0026] In a preferred embodiment, the fixing post 15, which is fixedly connected to the inner cavity of the piston head 2, has a cylindrical structure, and the end face of the fixing post 15 has an elliptical structure. The lower surface of the fixing post 15 has a screw hole, and the lower end of the fixing post 15 is matched with the size of the fixing groove. Meanwhile, the horizontal plate 14 has a rectangular structure.
[0027] In this embodiment, as Figure 2 and Figure 4 The dimensions of the fixing post 15 and the fixing groove are matched, which helps to enhance the stability of the connection between the fixing post 15 and the cross plate 14, avoids the chance of accidental rotation of the fixing post 15 and the piston head 2, and thus enhances the stability of the overall piston structure.
[0028] In a preferred embodiment, the base 9 has a cylindrical structure. The outer diameter of the upper end of the base 9 is larger than the diameter of the inner cavity of the piston head 2. The upper end of the outer side of the base 9 is connected to the positioning part 11 relative to the positioning groove. The line connecting the centers of the two sets of positioning parts 11 is perpendicular to the horizontal plate 14.
[0029] In this embodiment, as Figure 2 , Figure 3 and Figure 4 The positioning part 11 and the positioning groove are matched in size, which can help enhance the stability of the connection between the piston head 2 and the piston skirt 3, effectively avoid the problem of relative rotation between the piston head 2 and the piston skirt 3, and also help improve the efficiency of the fixing post 15 being embedded in the fixing groove.
[0030] In a preferred embodiment, the two sets of guide portions 5 fixedly connected to the outer side of the base 9 are both annular structures, and the outer diameter of the guide portion 5 is equal to the diameter of the outer side of the piston head 2. At the same time, the guide portion 5 at the upper end of the outer side of the base 9 fits against the lower surface of the piston head 2.
[0031] In this embodiment, as Figure 1 and Figure 2 The guide section 5 helps to enhance the stability of the piston skirt 3 when it moves, and in turn, helps to enhance the stability of the piston as a whole when it moves, ensuring that the piston can move normally inside the cylinder.
[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A piston for a diesel internal combustion engine, comprising: The piston head (2) is characterized in that: the outer side of the piston head (2) is movably connected to the gas ring (8) and the oil ring (6) through the annular groove (10), and the piston top (1) on the upper surface of the piston head (2) is provided with a valve groove (12), and the top of the inner cavity of the piston head (2) is fixedly connected to a fixing post (15), and the lower surface of the piston head (2) is provided with a fitting groove (16), and the upper end of the piston skirt (3) is movably connected in the fitting groove (16), while the piston skirt (3) is formed by... The base (9), guide (5) and cross plate (14) are composed of a base (9), a guide (5) and a cross plate (14). The guide (5) is fixedly connected to the outer side of the base (9), and the positioning part (11) is symmetrically connected to the upper end of the outer side of the base (9). Pin holes (4) are symmetrically opened in the middle of the outer side of the base (9), and the cross plate (14) is fixedly connected to the upper end of the inner cavity of the base (9). A fixing groove is opened on the upper surface of the cross plate (14) relative to the position of the fixing post (15), and the fixing post (15) is fixedly connected in the fixing groove by fixing bolt (13).
2. A piston for a diesel internal combustion engine according to claim 1, characterized in that, The valve groove (12) opened on the top (1) of the piston is circular in shape, and the opening at the upper end of the valve groove (12) is cylindrical, while the bottom of the inner cavity of the valve groove (12) is spherical.
3. A piston for a diesel internal combustion engine according to claim 1, characterized in that, Three sets of annular grooves (10) are opened at equal intervals along the axial direction on the outer side of the piston head (2). Multiple sets of through holes are opened at equal intervals around the annular groove (10) at the lower end of the piston head (2) in the circumferential direction. The through holes connect to the inner cavity of the piston head (2). At the same time, the oil ring (6) is movably connected in the annular groove (10) with through holes. A set of gas rings (8) are movably connected in the other two sets of annular grooves (10). A set of positioning blocks (7) is fixedly connected in the three sets of annular grooves (10). The positioning blocks (7) have a square structure and the three sets of positioning blocks (7) are evenly distributed in the horizontal plane.
4. A piston for a diesel internal combustion engine according to claim 1, characterized in that, The fitting groove (16) on the lower surface of the piston head (2) is cylindrical, and the size of the fitting groove (16) and the upper outer side of the base (9) are matched. Two sets of positioning grooves are symmetrically opened on both sides of the fitting groove (16), and both sets of positioning grooves are semi-cylindrical.
5. A piston for a diesel internal combustion engine according to claim 1, characterized in that, The fixing column (15) fixedly connected to the inner cavity of the piston head (2) has a columnar structure, and the end face of the fixing column (15) has an elliptical structure. The lower surface of the fixing column (15) has a screw hole, and the lower end of the fixing column (15) is matched with the size of the fixing groove. Meanwhile, the horizontal plate (14) has a rectangular structure.
6. A piston for a diesel internal combustion engine according to claim 1, characterized in that, The base (9) has a cylindrical structure. The outer diameter of the upper end of the base (9) is larger than the diameter of the inner cavity of the piston head (2). The upper end of the outer side of the base (9) is connected to the positioning part (11) relative to the positioning groove. The line connecting the centers of the two sets of positioning parts (11) is perpendicular to the horizontal plate (14).
7. A piston for a diesel internal combustion engine according to claim 1, characterized in that, The two sets of guides (5) fixedly connected to the outer side of the base (9) are both circular ring structures, and the outer diameter of the guide (5) is equal to the diameter of the outer side of the piston head (2). At the same time, the guide (5) at the upper end of the outer side of the base (9) fits against the lower surface of the piston head (2).