Wave-shaped inner-cooling pipeline piston

Abstract

The utility model discloses a wave-shaped inner-cooling pipeline piston, which belongs to the technical field of pistons and comprises a piston body and a wear-resistant insert ring, the piston body comprises a piston head and a piston skirt, the lower end of the piston head is connected with the upper end of the piston skirt, the upper end of the piston head is a piston active bank, and the lower end of the piston head is a piston ring bank. A combustion chamber is arranged on the upper end face of the piston active bank, and the upper end and the lower end of the piston ring bank are respectively provided with a ring groove, and is characterized in that the piston active bank is provided with an upper ring-shaped cooling cavity and a lower ring-shaped cooling cavity, the upper ring-shaped cooling cavity is located above the lower ring-shaped cooling cavity, and the outer side of the lower ring-shaped cooling cavity is provided with a ring-shaped mounting groove; the lower annular cooling cavity is communicated with the annular mounting groove, and a wear-resistant insert ring is mounted in the annular mounting groove; the inner ring wall of the upper annular cooling cavity is arranged in a wave shape, and the upper end wall and the lower end wall of the lower annular cooling cavity are arranged in a wave shape. Compared with the prior art, the cooling effect of the piston is improved.

Description

Technical Field

[0001] This utility model relates to the field of piston technology, and in particular to a waveform internal cooling pipe piston. Background Technology

[0002] In the complex and delicate combustion process of an internal combustion engine, the piston plays a crucial role, but it also faces extremely harsh operating environments, especially the challenge of extremely high thermal loads. During this process, a large amount of heat inevitably concentrates in the first ring groove region of the piston. This region, as the focal point of heat accumulation, experiences a particularly significant temperature rise. When the temperature of the first ring groove climbs to the sensitive range of 220°C to 260°C, the physicochemical properties of the lubricating oil undergo significant changes, the most direct consequence being the easy occurrence of high-temperature coking. This coking not only causes the piston rings to seize tightly in the ring grooves, thus greatly limiting the maximum combustion temperature that the engine can achieve, but also seriously hinders the improvement of overall engine efficiency, becoming one of the key factors restricting the performance of the internal combustion engine.

[0003] In light of this, experts and engineers in the field of internal combustion engines and piston manufacturing have been relentlessly exploring methods to effectively reduce the temperature of the first annular groove in order to overcome this technical bottleneck. Currently, a mainstream solution widely adopted in the industry is to use aluminum alloy as the main material for the piston, combined with a cleverly designed closed-loop internal cooling oil pipe system. The core concept of this design is to efficiently cool the entire piston and the particularly critical first annular groove area through the cooling medium circulating inside the internal cooling oil pipe, thereby controlling the temperature and extending the piston's service life.

[0004] However, while closed-loop internal cooling oil pipe solutions perform well in some aspects, open-loop internal cooling oil passage designs have significant drawbacks. Specifically, the cooling efficiency of open oil passages is relatively weak, making it difficult to fully meet the rapid cooling requirements under high-temperature environments. Simultaneously, to maintain the circulation of the cooling medium, the oil pump must bear a greater workload, which not only increases the engine's additional energy consumption but also indirectly reduces the engine's overall efficiency. More problematic is that, under harsh high-temperature environments, the lubricating oil in open cooling oil passages is more prone to carbon buildup. This not only affects the flow efficiency of the cooling medium but also further weakens the cooling effect, exacerbating the piston's heat dissipation problems. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of the existing technology by providing a waveform internal cooling pipe piston, thereby improving the piston cooling effect.

[0006] This utility model provides a corrugated internal cooling pipe piston, comprising a piston body and a wear-resistant insert. The piston body includes a piston head and a piston skirt. The lower end of the piston head is connected to the upper end of the piston skirt. The upper end of the piston head is divided into a piston power land and the lower end is divided into a piston ring land. The upper end face of the piston power land is provided with a combustion chamber, and the upper and lower ends of the piston ring land are respectively provided with annular grooves. The piston power land is provided with an upper annular cooling chamber and a lower annular cooling chamber. The upper annular cooling chamber is located above the lower annular cooling chamber. An annular mounting groove is provided on the outer side of the lower annular cooling chamber. The lower annular cooling chamber is connected to the annular mounting groove, and a wear-resistant insert is installed in the annular mounting groove. The inner ring wall of the upper annular cooling chamber is arranged in a corrugated shape, and the upper and lower end walls of the lower annular cooling chamber are also arranged in a corrugated shape.

[0007] Furthermore, the upper annular cooling chamber and the lower annular cooling chamber are located outside the combustion chamber.

[0008] Furthermore, an upper cooling pipe corresponding to its shape is installed inside the upper annular cooling cavity, and the cooling pipe is filled with inert gas.

[0009] Furthermore, a lower cooling pipe corresponding to its shape is installed inside the lower annular cooling cavity. The lower cooling pipe and the wear-resistant insert ring are an integral structure, and the lower cooling pipe is filled with high-temperature resistant lubricating oil.

[0010] Compared with the prior art, the present invention has the following outstanding advantages:

[0011] 1. This utility model has both an upper annular cooling chamber and a lower annular cooling chamber. The upper cooling pipe of the upper annular cooling chamber is filled with inert gas, and the lower cooling pipe of the lower annular cooling chamber is filled with high-temperature resistant lubricating oil, which effectively prevents the formation of carbon deposits and ensures that the piston can maintain a stable heat dissipation effect during its service life.

[0012] 2. The inner ring wall of the upper annular cooling chamber of this utility model is arranged in a wave shape, which can increase the contact area with the side wall of the combustion chamber. The upper and lower end walls of the lower annular cooling chamber are arranged in a wave shape. The upper wave-shaped wall of the lower annular cooling chamber can increase the contact area with the lower end wall of the upper annular cooling chamber, and the lower wave-shaped wall of the lower annular cooling chamber can increase the contact area with the piston body, thereby improving the heat transfer efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0015] Figure 3 This is the front view of this utility model;

[0016] Figure 4 yes Figure 3 A sectional view of section AA;

[0017] The components include: 1. Piston body; 11. Piston live land; 12. Piston ring land; 13. Ring groove; 14. Piston skirt; 15. Combustion chamber; 2. Wear-resistant insert; 3. Upper cooling pipe; 4. Lower cooling pipe. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] like Figures 1-4 As shown, this utility model includes a piston body 1, a wear-resistant insert 2, an upper annular cooling chamber, and a lower annular cooling chamber.

[0020] The piston body 1 includes a piston head and a piston skirt 14. The lower end of the piston head is connected to the upper end of the piston skirt 14. The upper end of the piston head is divided into a piston power land 11 and the lower end is divided into a piston ring land 12. The upper end face of the piston power land 11 is provided with a combustion chamber 15, and the upper and lower ends of the piston ring land 12 are respectively provided with ring grooves 13.

[0021] The piston power shore 11 is provided with an upper annular cooling cavity and a lower annular cooling cavity. The upper annular cooling cavity is located above the lower annular cooling cavity. An annular mounting groove is provided on the outer side of the lower annular cooling cavity. The lower annular cooling cavity is connected to the annular mounting groove. A wear-resistant insert 2 is installed in the annular mounting groove.

[0022] The upper and lower annular cooling chambers are located outside the combustion chamber 15. The inner ring wall of the upper annular cooling chamber is arranged in a wave shape, which can increase the contact area with the side wall of the combustion chamber 15 and improve the cooling efficiency.

[0023] The upper and lower end walls of the lower annular cooling cavity are arranged in a wave-like shape. The upper wave-like wall of the lower annular cooling cavity can increase the contact area with the lower end wall of the upper annular cooling cavity, and the lower wave-like wall of the lower annular cooling cavity can increase the contact area with the piston body 1, thereby improving the heat transfer efficiency.

[0024] In the optimized scheme, an upper cooling pipe 3 corresponding to its shape is installed in the upper annular cooling cavity, and the cooling pipe is filled with inert gas.

[0025] The lower annular cooling cavity is equipped with a lower cooling pipe 4 that corresponds to its shape. The lower cooling pipe 4 and the wear-resistant insert ring are an integral structure. The lower cooling pipe 4 is filled with high-temperature resistant lubricating oil.

[0026] The operating procedure is as follows: When this utility model is working, the inert gas in the upper cooling pipe 3 absorbs heat and expands. It exchanges heat with the high-temperature resistant lubricating oil in the lower cooling pipe 4 through the wall between the upper annular cooling chamber and the lower annular cooling chamber, transferring some of the heat to the high-temperature resistant lubricating oil, thereby cooling the piston.

[0027] It should be noted that the specific embodiments of this utility model have been described in detail. For those skilled in the art, all obvious changes made to it without departing from the spirit and scope of this utility model are within the protection scope of this utility model.

Claims

1. A corrugated internal cooling pipe piston, comprising a piston body (1) and a wear-resistant insert (2), wherein the piston body (1) comprises a piston head and a piston skirt (14), the lower end of the piston head is connected to the upper end of the piston skirt (14), the upper end of the piston head is divided into a piston power land (11), and the lower end is divided into a piston ring land (12), the upper end face of the piston power land (11) is provided with a combustion chamber (15), and the upper and lower ends of the piston ring land (12) are respectively provided with ring grooves (13); characterized in that: The piston force shore (11) is provided with an upper annular cooling cavity and a lower annular cooling cavity, the upper annular cooling cavity is located above the lower annular cooling cavity, the outer side of the lower annular cooling cavity is provided with an annular mounting groove, the lower annular cooling cavity is communicated with the annular mounting groove, and the annular mounting groove is mounted with a wear-resistant insert ring (2); the inner ring wall of the upper annular cooling cavity is arranged in a wave shape, and the upper end wall and the lower end wall of the lower annular cooling cavity are arranged in a wave shape.

2. A wave-form inner-cooled pipe piston according to claim 1, characterized in that: The upper annular cooling cavity and the lower annular cooling cavity are located outside the combustion chamber (15).

3. A wave-shaped inner-cooled pipe piston according to claim 1, characterized in that: The upper annular cooling cavity is mounted with an upper cooling pipeline (3) corresponding to the shape of the upper annular cooling cavity, and inert gas is injected into the cooling pipeline.

4. A wave-shaped inner-cooled pipe piston according to claim 1, characterized in that: The lower annular cooling cavity is mounted with a lower cooling pipeline (4) corresponding to the shape of the lower annular cooling cavity, the lower cooling pipeline (4) is an integral structure with the wear-resistant insert ring, and high-temperature resistant lubricating oil is injected into the lower cooling pipeline (4).

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