Self-locking inner-cooling ring-inserted piston

Abstract

The present application relates to the technical field of internal combustion engine piston, and particularly relates to a self-locking inner-cooling insert ring piston, which comprises a piston top cover and a piston skirt, and a self-locking inner-cooling insert ring is connected between the piston top cover and the piston skirt, the self-locking inner-cooling insert ring comprises an insert ring and an inner-cooling channel formed by a stainless steel inner-cooling thin wall, the insert ring and the inner-cooling channel are in a split type structure and are connected into a whole through a detachable structure. The present application is formed by split type assembly, and has the advantages of simple process parameter setting, small processing difficulty, simple manufacturing process, less influencing conditions, low waste rate after forming, no welding through due to welding problems, no bubbles generated in the welding interior, greatly improved service life of the structure, convenient maintenance and replacement, and effectively reduced enterprise cost.

Description

Technical Field

[0001] This invention relates to the field of internal combustion engine piston technology, and specifically to a self-locking internally cooled piston with insert rings. Background Technology

[0002] As engines develop towards higher load, higher power, and higher strength, stricter emission regulations and requirements for energy conservation, environmental protection, and sustainable development have made the thermal and mechanical loads on pistons more demanding, which has an adverse impact on piston lifespan. Therefore, it is necessary to strengthen the local reinforcement of pistons, optimize cooling, and improve wear resistance to meet environmental requirements.

[0003] The traditional design of separate piston internal coolers and piston rings is limited by the casting method, which means that the gap between the two cannot be eliminated. As a result, the cooling effect cannot meet the more demanding environmental requirements, nor can it meet the development trend of engine compactness and miniaturization.

[0004] Pistons in the current technology generally adopt a one-piece casting mode. Different casting molds need to be designed for pistons with different parameters, which increases the cost. Moreover, the internal cooler and the insert ring in the current technology are welded together. That is, the insert ring and the thin wall of the stainless steel internal cooler are welded together by means of micro-arc welding to form a channel and insert ring as one.

[0005] However, the current welding method has the following disadvantages: (1) The welding process of argon arc welding will produce toxic gases, a large amount of dust particles and CO2, etc.; (2) Setting process parameters is difficult, the manufacturing process is complex, and there are many influencing factors; (3) The welding process is unstable and it is easy to produce uneven welding, resulting in local stress concentration and aluminizing during use; (4) High scrap rate. The stainless steel inner cold wall is only about 0.5 mm thick, which is very easy to be welded through and bubbles are generated inside the weld. (5) Welding slag is easily generated on both sides of the weld, which is difficult to clean and affects the later use and lifespan; the production efficiency of welding is low.

[0006] (6) If the insert ring or the inner cooler thin wall is damaged, it cannot be replaced separately and the entire piston needs to be replaced, which increases the cost. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a self-locking internal cooling ring piston, which is simple to manufacture and less affected by various factors; it has a low scrap rate after forming, will not be welded through due to welding problems, and will not generate bubbles inside the weld; it greatly improves the service life of this structure, and the modular assembly structure makes it more applicable and reduces maintenance and replacement costs.

[0008] This invention is achieved through the following technical solution: A self-locking internal cooling ring piston is provided, wherein a self-locking internal cooling ring is connected between the piston top cover and the piston skirt. The self-locking internal cooling ring includes a ring and an internal cooling channel formed by a stainless steel internal cooling thin wall. The ring and the internal cooling channel are separate structures, but are connected into a whole by a detachable structure.

[0009] Furthermore, the bottom surface of the piston top cover has an annular upper groove that matches the shape of the upper half of the self-locking inner cooling ring, and the top surface of the piston skirt has an annular lower groove that matches the shape of the lower half of the self-locking inner cooling ring.

[0010] Furthermore, the bottom surface of the piston top cover has a boss protruding in the annular upper groove, and at least two L-shaped locking blocks are formed at intervals on the bottom surface of the boss. The top surface of the piston skirt has a groove for engaging with the boss in the annular lower groove. The bottom surface of the groove has an L-shaped latch corresponding to each L-shaped locking block. The length of the lateral part of the L-shaped latch is longer than the lateral part of the L-shaped locking block.

[0011] Furthermore, a high-temperature resistant sealant is applied between the bottom surface of the piston cap and the top surface of the piston skirt.

[0012] As one embodiment of the present invention, the detachable structure includes a snap-fit ​​groove and a snap-fit ​​ear. An upper groove and a lower groove are provided on the inner ring surface of the inlay ring. The stainless steel inner cooling thin wall is bent to form an annular semi-closed inner cooling channel, and the two sides of the stainless steel inner cooling thin wall in the length direction are bent to form snap-fit ​​ears that are inserted into the groove.

[0013] In another embodiment of the present invention, the detachable structure includes an internal thread and an external thread. An internal thread is formed on the inner annular surface of the insert ring. A closed annular internal cooling channel is formed by machining a thin stainless steel inner cooling wall. An external thread that can mate with the internal thread is formed on the outer surface of the internal cooling channel.

[0014] As a third embodiment of the present invention, the detachable structure includes a groove and a protrusion that engage with each other. A groove is formed on the inner ring surface of the inlay ring. A closed annular internal cooling channel is formed by processing a thin stainless steel inner cooling wall. A protrusion that matches the shape of the groove and transitions with each other is formed on the outer side of the internal cooling channel.

[0015] The beneficial effects of this invention are: The self-locking internal cooling ring piston of the present invention has a piston top cover and piston skirt connected by a locking block and a locking slot, and the self-locking internal cooling ring is pressed in between. It adopts a modular structure, which is convenient for processing and applicable to the processing and production of different pistons, reducing manufacturing costs. For different piston products, only the combustion chamber on the top surface of the piston top cover and the inner surface of the piston skirt need to be processed accordingly. The top cover, piston skirt and self-locking internal cooling ring do not need to be modified, which can improve processing efficiency. At the same time, the split structure also facilitates the replacement of parts and reduces maintenance costs.

[0016] The self-locking internal cooling ring of this invention overcomes the difficulties in the welding, manufacturing, processing and use of existing internal cooling rings. This molded structure is easy to install, improves the manufacturing method of the integrated internal cooling ring, reduces a large number of auxiliary equipment in the manufacturing process, reduces the inherent defects of the integrated internal cooling ring and improves its service life. At the same time, when applied to cast pistons, it can withstand more demanding working environments, and greatly plays a role in heat dissipation, temperature reduction, wear resistance and ensuring material properties at high temperatures for engine pistons.

[0017] This invention employs separate installation of the inlay ring and the internal cooling channel, using threads or snap-fit ​​to form a self-locking structure to prevent detachment. It can be formed simply by extrusion, suspension, or twisting, thus reducing production costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention.

[0019] Figure 2 for Figure 1 A cross-sectional schematic diagram.

[0020] Figure 3 for Figure 1 Top view of the piston skirt.

[0021] Figure 4 for Figure 1 A 45-degree bottom view of the piston top cover.

[0022] Figure 5 for Figure 1 A schematic diagram of the structure of the self-locking inner cooling ring.

[0023] Figure 6 for Figure 5 An unfolded diagram.

[0024] Figure 7 for Figure 5 A schematic diagram of the explosion structure.

[0025] Figure 8 This is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0026] Figure 9 This is a schematic diagram of the structure of Embodiment 3 of the present invention.

[0027] Figure 10 This is a schematic diagram of the structure of Embodiment 4 of the present invention.

[0028] As shown in the figure: 1-Inlaid ring, 2-Stainless steel thin wall, 3-Semi-enclosed internal cooling channel, 4-Slot, 5-Clamping lug, 6-Enclosed internal cooling channel, 7-External thread, 8-Internal thread, 9-Rectangular block, 10-Rectangular groove, 11-Arc-shaped block, 12-Arc-shaped groove, 13-Piston top cover, 14-Piston skirt, 15-Boss, 16-Clamping block, 17-Annular lower slot, 18-Clamping opening, 19-Groove, 20-Annular upper slot. Detailed Implementation

[0029] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0030] Example 1: like Figures 1-3 As shown, a self-locking internal cooling ring piston is provided, with a self-locking internal cooling ring connected between the piston top cover and the piston skirt. The self-locking internal cooling ring includes the ring and an internal cooling channel formed by a stainless steel internal cooling thin wall. The ring and the internal cooling channel are separate structures, but are connected into a whole by a detachable structure.

[0031] The bottom surface of the piston top cover has an annular upper groove that matches the shape of the upper half of the self-locking inner cooling ring, and the top surface of the piston skirt has an annular lower groove that matches the shape of the lower half of the self-locking inner cooling ring.

[0032] The bottom surface of the piston top cover has a protrusion formed in the annular upper groove, and at least two L-shaped locking blocks are formed at intervals on the bottom surface of the protrusion. The top surface of the piston skirt has a recess formed in the annular lower groove for engaging with the protrusion. The bottom surface of the groove has an L-shaped latch that corresponds to each L-shaped locking block. The length of the lateral part of the L-shaped latch is longer than the lateral part of the L-shaped locking block.

[0033] The L-shaped slot in the groove of the piston skirt allows the L-shaped locking block of the piston top cover to be inserted. By rotating the piston top cover at a certain angle, the L-shaped locking block can be locked into the L-shaped slot, making it difficult for the two to loosen or fall off.

[0034] To further ensure connection stability and improve sealing, a high-temperature resistant sealant is applied between the bottom surface of the piston top cover and the top surface of the piston skirt.

[0035] The self-locking internal cooling ring includes a ring 1 and an internal cooling channel formed by a stainless steel internal cooling thin wall 2. The ring 1 and the internal cooling channel are separate structures, but are connected into a whole by a detachable structure.

[0036] The detachable structure includes a slot 4 and a lug 5 that engage with each other. An upper slot and a lower slot are provided on the inner ring surface of the inlay ring 1. The stainless steel inner cooling thin wall 2 is bent to form an annular semi-closed inner cooling channel 3, and the two sides of the stainless steel inner cooling thin wall 2 along its length are bent to form lugs 5 that engage with the slot 4.

[0037] The lugs 5 on both sides of the stainless steel inner cooling thin wall 2 along its length are respectively inserted into the upper and lower slots. At this time, the semi-enclosed inner cooling channel 3 will cooperate with the inlay ring 1 to form a closed inner cooling channel. The two are self-locking and form a whole.

[0038] Example 2: The difference between this embodiment and Embodiment 1 is that the detachable structure includes an internal thread 8 and an external thread 7, such as... Figure 4 As shown, an internal thread 8 is formed on the inner annular surface of the insert ring 1, and an annular closed internal cooling channel 6 is formed by machining the stainless steel inner cooling thin wall 2. An external thread 7 that can match the internal thread 8 is formed on the outer side of the internal cooling channel.

[0039] Example 3: The difference between this implementation and Example 1 is that the detachable structure includes a snap-fit ​​groove and a protrusion, such as... Figure 5 As shown, a groove is formed on the inner ring surface of the inlay ring 1. In this embodiment, the groove is a rectangular groove 10. The stainless steel inner cooling thin wall 2 is processed to form an annular closed inner cooling channel 6. The outer side of the inner cooling channel is formed with a protrusion that matches the shape of the groove and transitions with each other. The protrusion is a rectangular block 9 that matches the shape of the rectangular groove 10.

[0040] Example 4: The difference between this embodiment and embodiment 3 is that, as Figure 6 As shown, the groove formed on the inner ring surface of the inlay ring 1 is an arc-shaped groove 12. The stainless steel inner cooling thin wall 2 is processed to form an annular closed inner cooling channel 6. The outer side of the inner cooling channel has an arc-shaped block 11 that matches the arc-shaped groove 12.

[0041] In Embodiments 3 and 4 of the present invention, the groove and protrusion transition fit can be an interference fit to ensure the self-locking and stability of the connection.

[0042] Of course, the above description is not limited to the examples above. Technical features not described in this invention can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solutions of this invention and are not intended to limit this invention. This invention has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention do not depart from the spirit of this invention and should also fall within the scope of protection of the claims of this invention.

Claims

1. A self-locking internally cooled piston with a piston top cover and a piston skirt, characterized in that: A self-locking internal cooling ring is connected between the piston top cover and the piston skirt. The self-locking internal cooling ring includes the ring and an internal cooling channel formed by a stainless steel internal cooling thin wall. The ring and the internal cooling channel are separate structures, but are connected as a whole by a detachable structure. The bottom surface of the piston top cover has an annular upper groove that matches the shape of the upper half of the self-locking internal cooling ring, and the top surface of the piston skirt has an annular lower groove that matches the shape of the lower half of the self-locking internal cooling ring. The bottom surface of the piston top cover has a boss protruding in the annular upper groove, and at least two L-shaped locking blocks are formed at intervals on the bottom surface of the boss. The top surface of the piston skirt has a groove for engaging with the boss in the annular lower groove. The bottom surface of the groove has L-shaped latches that correspond to each L-shaped locking block. The horizontal length of the L-shaped latch is longer than the horizontal length of the L-shaped locking block.

2. The self-locking internal cooling ring piston according to claim 1, characterized in that: A high-temperature resistant sealant is applied between the bottom surface of the piston top cover and the top surface of the piston skirt.

3. The self-locking internal cooling ring piston according to claim 1, characterized in that: The detachable structure includes a snap-fit ​​slot and a clip. An upper slot and a lower slot are provided on the inner ring surface of the inlay. The stainless steel inner cooling thin wall is bent to form an annular semi-closed inner cooling channel, and the two sides of the stainless steel inner cooling thin wall along the length direction are bent to form clips that fit into the slot.

4. The self-locking internal cooling ring piston according to claim 1, characterized in that: The detachable structure includes internal and external threads. The internal thread is formed on the inner ring surface of the insert. The stainless steel inner cold thin wall is machined to form an annular closed internal cold channel. The outer side of the internal cold channel is formed with an external thread that can match the internal thread.

5. The self-locking internal cooling ring piston according to claim 1, characterized in that: The detachable structure includes a snap-fit ​​groove and a protrusion. A groove is recessed on the inner ring surface of the inlay. A closed annular internal cooling channel is formed by machining a thin stainless steel inner cooling wall. A protrusion that matches the shape of the groove and transitions with it is formed on the outer side of the internal cooling channel.

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