Powder metallurgy automobile piston with gradient pore structure

Abstract

The utility model discloses a powder metallurgy automobile piston with a gradient pore structure, and relates to the technical field of automobile part manufacturing, the powder metallurgy automobile piston comprises a cylinder body, the outer wall of the cylinder body is fixedly connected with a lubricating device, the outer wall of the lubricating device is connected with a movable device in a sliding mode, and the movable device is connected with the cylinder body in a sliding mode. The lubricating device discharges oil through sliding of the movable device. The lubricating device is arranged, the S-shaped groove is formed in the inner wall of the cylinder body and matched with the circumferential array arrangement of the balls, and the oil storage characteristic of a powder metallurgy gradient pore structure is combined, so that dynamic self-lubricating in the piston movement process is achieved; lubricating oil in the S-shaped grooves is forced to directionally flow to the outer wall of the piston, friction resistance is effectively reduced, traditional sliding friction is converted into rolling friction through the rolling contact design of the balls and the limiting strips, the retention time of the lubricating oil in the piston is prolonged through the winding paths of the S-shaped grooves, and the heat dissipation effect is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts manufacturing technology, specifically to a powder metallurgy automotive piston with a gradient pore structure. Background Technology

[0002] During the operation of a car engine, the piston, as the core component that converts gas pressure into mechanical energy, directly affects the engine's power output, fuel economy, and service life.

[0003] Current piston lubrication methods mostly rely on external oil systems to supply oil through injectors or oil passages. When the engine is running at high speed or the operating conditions change frequently, it is difficult to accurately control the supply and distribution of lubricating oil, which can easily lead to insufficient lubrication in some areas or excessive oil consumption. The wear caused by poor lubrication in the friction area between the piston ring land and the cylinder wall not only reduces the piston's service life but also increases the engine's fuel consumption and emissions. The sliding friction structure of traditional pistons results in high contact stress between the piston and the cylinder wall. At the same time, the piston is subjected to high temperatures during operation. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a powder metallurgy automotive piston with a gradient pore structure, which solves the problems of uneven lubrication, high wear, poor heat dissipation, and complex structure of traditional pistons.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a powder metallurgy automotive piston with a gradient porosity structure, comprising: a cylinder, a lubrication device fixedly connected to the outer wall of the cylinder, a movable device slidably connected to the outer wall of the lubrication device, the lubrication device discharging oil through the sliding of the movable device, the lubrication device including an oil inlet pipe, an oil cavity fixedly connected to the outer wall of the oil inlet pipe, and an S-shaped groove fixedly connected to the output end of the oil cavity, the oil cavity and the S-shaped groove of the lubrication device being directly formed on the inner wall of the cylinder, the meandering path of the S-shaped groove extending the residence time of the lubricating oil inside the piston and enhancing the heat dissipation effect.

[0008] Preferably, the outer wall of the oil inlet pipe is fixedly connected to the inner wall of the cylinder, and the oil cavity and S-shaped groove are formed in the inner wall of the cylinder.

[0009] Preferably, a sphere is rotatably connected to the inner wall of the S-shaped groove. The inner wall of the S-shaped groove and the outer wall of the sphere are arranged in a circumferential array along the central axis of the cylinder. By opening an S-shaped groove on the inner wall of the cylinder and cooperating with the circumferential array arrangement of the sphere, combined with the oil storage characteristics of the gradient pore structure of powder metallurgy, dynamic self-lubrication during piston movement is achieved.

[0010] Preferably, the outer wall of the sphere is symmetrically contacted with the limiting strip, the side wall of the limiting strip is fixedly connected to the outer wall of the cylinder, and the outer wall of the sphere is rotatably connected to the inner wall of the cylinder. When the movable device slides, the sphere is constrained to rotate by the limiting strip, which forces the lubricating oil in the S-shaped groove to flow in a directional manner to the outer wall of the piston, effectively reducing frictional resistance.

[0011] Preferably, the movable device includes a pull rod, the top end of which is rotatably connected to a plug, the inner wall of which has a void structure, and the pull rod of the movable device drives the plug to slide.

[0012] Preferably, the outer wall of the plug is rotatably connected to the outer wall of the sphere, the outer wall of the plug is slidably connected to the outer wall of the limiting strip, and the outer wall of the plug is slidably connected to the inner wall of the cylinder.

[0013] Beneficial effects

[0014] This invention provides a powder metallurgy automotive piston with a gradient porosity structure. It possesses the following...

[0015] Beneficial effects:

[0016] This utility model, by setting up a lubrication device, and by opening an S-shaped groove on the inner wall of the cylinder and coordinating it with the circumferential array of spheres, combined with the oil storage characteristics of the gradient pore structure of powder metallurgy, achieves dynamic self-lubrication during piston movement. When the moving device slides, the spheres are constrained to rotate by the limiting strip, forcing the lubricating oil in the S-shaped groove to flow in a directional direction to the outer wall of the piston, effectively reducing frictional resistance. The rolling contact design between the spheres and the limiting strip transforms traditional sliding friction into rolling friction. The meandering path of the S-shaped groove extends the residence time of the lubricating oil inside the piston, enhancing the heat dissipation effect. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0019] Figure 3 This is a schematic diagram of the void structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the S-shaped groove of this utility model;

[0021] Figure 5 This utility model Figure 4 A magnified structural diagram of point A in the middle.

[0022] In the diagram: 1. Cylinder; 2. Lubrication device; 20. Oil inlet pipe; 21. Oil chamber; 22. S-groove; 23. Ball; 24. Limiting strip; 3. Movable device; 30. Tie rod; 31. Plug; 32. Void structure. Detailed Implementation

[0023] 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.

[0024] Example

[0025] Please see Figure 1-5 This utility model provides a technical solution: a powder metallurgy automotive piston with a gradient pore structure, comprising:

[0026] The cylinder 1 has a lubrication device 2 fixedly connected to its outer wall, and a movable device 3 slidably connected to the outer wall of the lubrication device 2. The lubrication device 2 discharges oil through the sliding of the movable device 3. When the piston reciprocates inside the cylinder 1, the movable device 3 slides synchronously with the piston, driving the lubrication device 2 to deliver the lubricating oil to the outer wall of the piston in a directional manner.

[0027] The lubrication device 2 includes an oil inlet pipe 20, an oil chamber 21 fixedly connected to the outer wall of the oil inlet pipe 20, and an S-shaped groove 22 fixedly connected to the output end of the oil chamber 21. The outer wall of the oil inlet pipe 20 is fixedly connected to the inner wall of the cylinder 1. The oil chamber 21 and the S-shaped groove 22 are opened in the inner wall of the cylinder 1. When the piston slides back and forth on the inner wall of the cylinder 1, the oil can smoothly enter the oil chamber 21 from the engine oil passage through the oil inlet pipe 20 because the outer wall of the oil inlet pipe 20 is fixedly connected to the inner wall of the cylinder 1 and the oil chamber 21 is opened in the inner wall of the cylinder 1. The oil chamber 21 serves as a temporary storage and pressure stabilization space for lubricating oil, ensuring that the lubricating oil flows steadily into the S-shaped groove 22 in the future.

[0028] The inner wall of the S-shaped groove 22 is rotatably connected to a ball 23. The inner wall of the S-shaped groove 22 and the outer wall of the ball 23 are arranged in a circumferential array along the central axis of the cylinder 1. Since the outer wall of the plug 31 is slidably connected to the limiting strip 24 and the outer wall of the ball 23, the plug 31 will contact the ball 23 through the limiting strip 24. Under the push of the plug 31, the ball 23 rolls along the limiting strip 24. This rolling action breaks the static balance of the lubricating oil in the S-shaped groove 22.

[0029] The outer wall of the ball 23 is symmetrically contacted with the limiting strip 24. The side wall of the limiting strip 24 is fixedly connected to the outer wall of the cylinder 1. The outer wall of the ball 23 is rotatably connected to the inner wall of the cylinder 1. When the ball 23 rolls, it squeezes the lubricating oil in the S-shaped groove 22. Due to the unique meandering path design of the S-shaped groove 22, the lubricating oil is forced to flow in a directional direction along the S-shaped path and is finally sprayed to the piston ring land and skirt area through the output end of the S-shaped groove 22. The rolling contact design between the ball 23 and the limiting strip 24 transforms the traditional sliding friction into rolling friction. Compared with the larger friction force and wear rate in sliding friction, rolling friction significantly reduces the wear in the piston ring land area, resulting in a significant reduction in the wear degree of this area.

[0030] The movable device 3 includes a pull rod 30, with a plug 31 rotatably connected to the top of the pull rod 30. The inner wall of the plug 31 has a void structure 32. The outer wall of the plug 31 is rotatably connected to the outer wall of the ball 23. The outer wall of the plug 31 is slidably connected to the outer wall of the limiting strip 24. The outer wall of the plug 31 is slidably connected to the inner wall of the cylinder 1. When the piston moves downward, the pull rod 30 drives the plug 31 to move downward synchronously. The inner wall of the plug 31 has a void structure 32.

[0031] When in use, as the piston reciprocates inside the cylinder 1, the movable device 3 slides synchronously with the piston, driving the lubrication device 2 to deliver lubricating oil to the outer wall of the piston in a directional manner.

[0032] When the piston slides back and forth on the inner wall of the cylinder 1, the outer wall of the oil inlet pipe 20 is fixedly connected to the inner wall of the cylinder 1, and the oil chamber 21 is opened in the inner wall of the cylinder 1. The engine oil can smoothly enter the oil chamber 21 from the engine oil passage through the oil inlet pipe 20. The oil chamber 21 serves as a temporary storage and pressure stabilization space for lubricating oil, which can ensure that the lubricating oil flows steadily into the S-shaped groove 22 in the future.

[0033] When the piston moves downward, the pull rod 30 drives the plug body 31 to move downward synchronously. The inner wall of the plug body 31 has a void structure 32. Since the outer wall of the plug body 31 is slidably connected to the outer wall of the limiting strip 24 and the outer wall of the ball 23, the plug body 31 will contact the ball 23 through the limiting strip 24. Under the push of the plug body 31, the ball 23 rolls along the limiting strip 24. This rolling action breaks the static balance of the lubricating oil in the S-shaped groove 22.

[0034] When the ball 23 rolls, it squeezes the lubricating oil in the S-shaped groove 22. Thanks to the unique meandering path design of the S-shaped groove 22, the lubricating oil is forced to flow in a directional manner along the S-shaped path and is finally sprayed to the piston ring land and skirt area through the output end of the S-shaped groove 22. The rolling contact design between the ball 23 and the limiting strip 24 transforms the traditional sliding friction into rolling friction. Compared with the larger friction force and wear rate in sliding friction, rolling friction significantly reduces the wear in the piston ring land area, thus greatly reducing the wear degree in this area.

[0035] Furthermore, the path of the lubricating oil flowing within the S-shaped groove 22 is significantly longer than that of a straight channel. This extended path means a substantial increase in the contact area between the lubricating oil and the inner wall of the S-shaped groove 22, effectively expanding the heat exchange area. This allows the lubricating oil to more fully absorb the heat generated during piston operation and transfer the heat to other areas of the piston or the cooling system, thereby enhancing the piston's heat dissipation effect.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0037] 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 powder metallurgy automotive piston with a gradient porosity structure, comprising: The cylindrical body (1) is characterized by: The outer wall of the cylinder (1) is fixedly connected to a lubrication device (2), and the outer wall of the lubrication device (2) is slidably connected to a movable device (3). The lubrication device (2) discharges oil through the sliding of the movable device (3). The lubrication device (2) includes an oil inlet pipe (20), an oil cavity (21) is fixedly connected to the outer wall of the oil inlet pipe (20), and an S-shaped groove (22) is fixedly connected to the output end of the oil cavity (21).

2. The powder metallurgy automotive piston with a gradient pore structure according to claim 1, characterized in that: The outer wall of the oil inlet pipe (20) is fixedly connected to the inner wall of the cylinder (1), and the oil cavity (21) and the S-shaped groove (22) are opened in the inner wall of the cylinder (1).

3. The powder metallurgy automotive piston with a gradient pore structure according to claim 1, characterized in that: The inner wall of the S-shaped groove (22) is rotatably connected to a sphere (23), and the inner wall of the S-shaped groove (22) and the outer wall of the sphere (23) are arranged in a circular array along the central axis of the cylinder (1).

4. The powder metallurgy automotive piston with a gradient pore structure according to claim 3, characterized in that: The outer wall of the sphere (23) is symmetrically contacted with the limiting strip (24), the side wall of the limiting strip (24) is fixedly connected to the outer wall of the cylinder (1), and the outer wall of the sphere (23) is rotatably connected to the inner wall of the cylinder (1).

5. A powder metallurgy automotive piston with a gradient pore structure according to claim 3, characterized in that: The movable device (3) includes a pull rod (30), and a plug (31) is rotatably connected to the top of the pull rod (30). The inner wall of the plug (31) is a void structure (32).

6. The powder metallurgy automotive piston with a gradient porosity structure according to claim 5, characterized in that: The outer wall of the plug (31) is rotatably connected to the outer wall of the sphere (23), the outer wall of the plug (31) is slidably connected to the outer wall of the limiting strip (24), and the outer wall of the plug (31) is slidably connected to the inner wall of the cylinder (1).

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