Steel piston

Abstract

The utility model discloses a steel piston which is characterized in that an inclined oil hole platform is arranged at the bottom of an inner cavity of an inner cavity surface of a steel piston main body and protrudes out of the surface of the inner cavity surface, and an inclined oil hole communicated with a lubricating oil channel is formed in the inclined oil hole platform; cooling lubricating oil stored in the cooling oil cavity enters the contact faces of the connecting rod, the piston pin and the piston pin hole sequentially through the lubricating oil channel, the inclined oil hole and the oil hole in the connecting rod small end, the protruding inclined oil hole platform structure is easier to forge and form compared with a small pit structure, the blank manufacturing difficulty is lowered, and the machining efficiency is improved. The protruding inclined oil hole platform structure can better guide cooling lubricating oil in the cooling oil cavity to flow into the connecting rod and the piston pin, lubrication is provided for contact between the piston pin hole and the connecting rod and the piston pin, and the occlusion risk is effectively reduced. The lightweight design and the machining quality are both considered, and meanwhile the failure risk of the piston in an engine is reduced.

Description

Technical Field

[0001] This utility model relates to the field of internal combustion engine technology, and in particular to a steel piston. Background Technology

[0002] A piston is a reciprocating component in the cylinder block of an automobile engine. The basic structure of a piston can be divided into the top, head, and skirt. The piston top is the main part of the combustion chamber, and its shape depends on the type of combustion chamber used. Gasoline engines mostly use flat-top pistons, which have the advantage of a small heat absorption area. Diesel engine piston tops often have various recesses, the specific shape, position, and size of which must be adapted to the requirements of mixture formation and combustion in the diesel engine. The piston is a crucial power source for internal combustion engines, which are essential for modern transportation and industrial equipment, and its applications are wide-ranging and diverse.

[0003] Existing steel pistons suffer from quality issues such as machining misalignment, poor consistency, and damage to non-machined surfaces due to the lack of a special structure at the inclined oil hole and the absence of a machining guide surface at the inclined oil hole. Designing a small recessed structure at the inclined oil hole at the top of the steel piston cavity, however, presents problems such as difficulty in forging and machining deformation in areas with localized thin walls.

[0004] Therefore, how to solve the problem of poor consistency or low efficiency in the machining of inclined oil holes in existing steel pistons is one of the key tasks for those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a steel piston that solves the problems of poor consistency or low efficiency in the machining of inclined oil holes in existing steel pistons, and effectively reduces the risk of seizing between the piston pin hole and the piston pin and connecting rod.

[0006] To solve the above-mentioned technical problems, this utility model provides a steel piston, including a steel piston body and an inclined oil hole platform disposed at the bottom of the inner cavity surface of the steel piston body and protruding from the inner cavity surface. The inclined oil hole platform is located at the output end of the cooling oil cavity of the steel piston body and is provided with an inclined oil hole for allowing the cooling lubricating oil stored in the cooling oil cavity to enter the contact surface of the connecting rod small end, piston pin and piston pin hole in sequence through the lubricating oil channel of the steel piston body, the inclined oil hole and the oil hole on the connecting rod small end. The top of the inclined oil hole platform faces the connecting rod small end.

[0007] The distance between the inclined oil hole platform and the small end of the connecting rod is 3-5mm.

[0008] The angle between the length direction of the inclined oil hole and the central axis of the lubricating oil channel is 0-15 degrees.

[0009] The inclined oil hole platform is cylindrical or cuboid in shape.

[0010] The inclined oil hole platform can be a rotating inclined oil hole platform or a tensioned inclined oil hole platform.

[0011] The lubricating oil channel and the central axis of the inclined oil hole are on the same straight line.

[0012] The cross-sections of the lubricating oil channel and the inclined oil hole are circular, and the cross-sectional dimensions of the lubricating oil channel and the inclined oil hole are equal.

[0013] The piston body and the inclined oil hole platform are an integral structure.

[0014] The steel piston provided in this embodiment of the invention has the following advantages compared with the prior art:

[0015] The steel piston provided in this embodiment features an inclined oil hole platform at the bottom of the inner cavity of the piston body. This platform contains an inclined oil hole communicating with a lubricating oil channel. Cooling lubricating oil stored in the cooling oil chamber flows sequentially through the lubricating oil channel, the inclined oil hole, and the oil hole at the small end of the connecting rod into the contact surfaces of the connecting rod, piston pin, and piston pin hole. The raised inclined oil hole platform structure is easier to forge than a small recessed structure, reducing the difficulty of blank manufacturing. This structure also better guides the cooling lubricating oil in the cooling oil chamber into the connecting rod and piston pin, providing lubrication for the contact between the piston pin hole and the connecting rod and piston pin, effectively reducing the risk of seizure. This design balances lightweight construction with high-quality machining, while also reducing the risk of piston failure in the engine. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of one embodiment of the steel piston provided by this utility model;

[0018] Among them, 100-steel piston body, 10-lubricating oil channel, 20-slanted oil hole platform, 30-connecting rod small end, 40-piston pin. Detailed Implementation

[0019] 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.

[0020] Please refer to Figure 1 , Figure 1 A schematic diagram of one embodiment of the steel piston provided by this utility model.

[0021] In one specific embodiment, the steel piston includes a steel piston body 100 and an inclined oil hole platform 20 disposed at the bottom of the inner cavity surface of the steel piston body 100 and protruding from the inner cavity surface. The inclined oil hole platform 20 is located at the output end of the cooling oil cavity of the steel piston body 100 and is provided with an inclined oil hole for allowing the cooling lubricating oil stored in the cooling oil cavity to enter the contact surface of the connecting rod small end, piston pin 40 and piston pin hole in sequence through the lubricating oil channel 10 of the steel piston body 100, the inclined oil hole and the oil hole on the connecting rod small end 30. The top of the inclined oil hole platform 20 faces the connecting rod small end 30.

[0022] By setting an inclined oil hole platform 20 at the bottom of the inner cavity of the steel piston body 100, and setting an inclined oil hole in the inclined oil hole platform 20 that communicates with the lubricating oil channel 10, the cooling lubricating oil stored in the cooling oil chamber enters the contact surface of the connecting rod, piston pin 40 and piston pin 40 hole in sequence through the lubricating oil channel 10, the inclined oil hole and the oil hole on the connecting rod small end 30. The raised inclined oil hole platform 20 structure is easier to forge than the small pit structure, reducing the difficulty of blank manufacturing. The raised inclined oil hole platform 20 structure can better guide the cooling lubricating oil in the cooling oil chamber into the connecting rod and piston pin 40, providing lubrication for the contact between the piston pin 40 hole and the connecting rod and piston pin 40, effectively reducing the risk of seizing; it takes into account both lightweight design and processing quality, and at the same time reduces the risk of piston failure in the engine.

[0023] The raised inclined oil hole platform 20 in this application shortens the distance to the small end 30 of the connecting rod, which can better guide the cooling lubricating oil in the cooling oil chamber into the connecting rod and piston pin 40. There is no limitation on the distance between the two, which is generally designed to be 3-5mm.

[0024] This application mainly focuses on the design of lubricating oil injection. An inclined oil hole is also provided in the inclined oil hole platform 20 to allow lubricating oil to pass through and shorten the distance from the cooling lubricating oil to the small end 30 of the connecting rod. The specific inclination direction, size, shape, etc. of the lubricating oil channel 10 are not limited. Generally, in order to improve the alignment, the angle between the length direction of the inclined oil hole and the central axis of the lubricating oil channel 10 is 0-15 degrees.

[0025] Preferably, the plane of the raised inclined oil hole platform 20 is perpendicular to the inclined oil hole, providing a positive plane for the machining of the inclined oil hole, which facilitates drilling and improves machining quality and efficiency.

[0026] The shape of the inclined oil hole platform 20 is not limited in this application in order to reduce interference with the operation of the original steel piston. The shape of the inclined oil hole platform 20 is a cylinder or a cuboid.

[0027] The inclined oil hole platform 20 can be a rotating inclined oil hole platform 20 or a stretching inclined oil hole platform 20, or other structures. Using rotation or stretching is beneficial to achieve blank forging, improve process efficiency, reduce process costs, and reduce material costs.

[0028] Preferably, the lubricating oil channel and the central axis of the inclined oil hole are on the same straight line.

[0029] It should be noted that the lubricating oil channel and the inclined oil hole in this application can be on the same straight line, or they can be a curved structure or other structures for other reasons.

[0030] In this application, the shape of the lubricating oil channel 10 and the inclined oil hole is not limited. Preferably, the cross-section of the lubricating oil channel 10 and the inclined oil hole is circular, and the cross-sectional dimensions of the lubricating oil channel 10 and the inclined oil hole are equal.

[0031] By making the shape and size of the lubricating oil channel 10 equal to that of the inclined oil hole, the original flow rate of the lubricating oil will not be affected during the passage of cooling lubricating oil, that is, it will not have a negative impact on its injection process, and there is no need to redesign other structures of the piston, thus reducing the impact on the overall structure.

[0032] The method of combining the piston body and the inclined oil hole platform 20 is not limited. It can be a separate structure or an integrated structure. If an integrated structure is adopted, the piston body and the inclined oil hole platform 20 are an integrated structure.

[0033] The unibody structure allows for a balance between lightweight design and manufacturing quality, while also reducing the risk of piston failure in the engine.

[0034] In one embodiment, the steel piston has an inclined oil hole platform 20 designed at the bottom of the piston cavity. The platform protrudes from the inner cavity surface and is a rotating or stretched body. The inclined oil hole platform 20 is formed by forging. The top surface of the inclined oil hole platform 20 is perpendicular to the inclined oil hole, which can be achieved by drilling. The protruding inclined oil hole platform 20 shortens the distance with the small end 30 of the connecting rod, and the distance between the two is generally designed to be 3-5mm. Cooling and lubricating oil enters the contact surface of the connecting rod, piston pin 40, and piston pin 40 hole through the inclined oil hole and the oil hole on the small end 30. Using rotation or stretching is beneficial to achieve blank forging. The inclined oil hole in the inclined oil hole platform 20 is the same size as the original inclined oil hole, and the inclined oil hole is straight (cylindrical). The inclined oil hole platform 20 is integrally forged with the original structure.

[0035] The above structure has the following beneficial effects:

[0036] 1. The raised inclined oil hole platform 20 structure is easier to forge and form than the small pit structure, reducing the difficulty of blank manufacturing;

[0037] 2. The raised inclined oil hole platform 20 plane is perpendicular to the inclined oil hole, providing a positive plane for the machining of the inclined oil hole, which facilitates drilling and improves machining quality and efficiency;

[0038] 3. The raised inclined oil hole platform 20 structure can better guide the cooling lubricating oil in the cooling oil chamber into the connecting rod and piston pin 40, providing lubrication for the contact between the piston pin 40 hole and the connecting rod and piston pin 40, effectively reducing the risk of seizure;

[0039] 4. It balances lightweight design with manufacturing quality, while reducing the risk of piston failure in the engine.

[0040] In summary, the steel piston provided by this utility model embodiment features an inclined oil hole platform at the bottom of the inner cavity of the piston body. This platform contains an inclined oil hole communicating with a lubricating oil channel. Cooling lubricating oil stored in the cooling oil chamber sequentially enters the contact surfaces of the connecting rod, piston pin, and piston pin hole through the lubricating oil channel, the inclined oil hole, and the oil hole at the small end of the connecting rod. The raised inclined oil hole platform structure is easier to forge than a small recessed structure, reducing the difficulty of blank manufacturing. This structure also better guides the cooling lubricating oil in the cooling oil chamber into the connecting rod and piston pin, providing lubrication for the contact between the piston pin hole and the connecting rod and piston pin, effectively reducing the risk of seizure. It balances lightweight design and processing quality while reducing the risk of piston failure in the engine.

[0041] The steel piston provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A steel piston, characterized in that, The device includes a steel piston body and an inclined oil hole platform located at the bottom of the inner cavity surface of the steel piston body and protruding from the inner cavity surface. The inclined oil hole platform is located at the output end of the cooling oil chamber of the steel piston body and is provided with an inclined oil hole for allowing the cooling lubricating oil stored in the cooling oil chamber to enter the contact surface of the connecting rod small end, piston pin, and piston pin hole in sequence through the lubricating oil channel of the steel piston body, the inclined oil hole, and the oil hole on the connecting rod small end. The top of the inclined oil hole platform faces the connecting rod small end.

2. The steel piston as described in claim 1, characterized in that, The distance between the inclined oil hole platform and the small end of the connecting rod is 3-5mm.

3. The steel piston as described in claim 2, characterized in that, The angle between the length direction of the inclined oil hole and the central axis of the lubricating oil channel is 0-15 degrees.

4. The steel piston as described in claim 3, characterized in that, The inclined oil hole platform is cylindrical or cuboid in shape.

5. The steel piston as described in claim 4, characterized in that, The inclined oil hole platform is either a rotating inclined oil hole platform or a tensioned inclined oil hole platform.

6. The steel piston as described in claim 5, characterized in that, The lubricating oil channel and the central axis of the inclined oil hole are on the same straight line.

7. The steel piston as described in claim 6, characterized in that, The cross-sections of the lubricating oil channel and the inclined oil hole are circular, and the cross-sectional dimensions of the lubricating oil channel and the inclined oil hole are equal.

8. The steel piston as described in claim 7, characterized in that, The piston body and the inclined oil hole platform are an integral structure.

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