An all-steel piston

Abstract

This application discloses an all-steel piston, including a piston body, a piston pin bore, and an internal oil cavity. The inner wall of the piston pin bore is provided with two symmetrically distributed crescent-shaped structures and two groove structures; the groove structures communicate with the crescent-shaped structures. The piston body has at least two through holes, which connect the internal oil cavity with the inner cavity of the piston body, and the through holes are symmetrically arranged in the inner cavity of the piston body. By providing a combination structure of through holes, crescents, and grooves in the existing piston structure, the cooling lubricating oil in the oil cavity can be better guided to flow into the connecting rod and piston pin, providing lubrication for the contact between the piston pin bore and the connecting rod and piston pin, effectively reducing the risk of seizure. This solution takes into account both lightweight design and manufacturing quality, while reducing the risk of piston failure in the engine.

Description

Technical Field

[0001] This application relates to the field of engine technology, and more specifically, to an all-steel piston. Background Technology

[0002] Internal combustion engines that use methanol, hydrogen, or ammonia as fuel are prone to knocking during use. This is because insufficient lubricating oil is present in the clearance between the pin hole and the pin, and the lubricating oil film cannot be properly distributed in the clearance when starting for the first time or after a long period of inactivity, resulting in abnormal friction and wear of the pin hole, and in severe cases, pin seizure.

[0003] CN204691924U discloses a utility model patent entitled "A Piston with a Lubricating Oil Groove." The cylindrical surface of the piston pin hole has a lubricating oil groove along its inner wall. This lubricating oil groove is a U-shaped groove extending outwards from the opening of the piston pin hole. While this structure can lubricate both the piston pin hole and the piston pin, the U-shaped groove has the following drawback: the space of the U-shaped groove is too large relative to the inner wall of the pin hole. During piston operation, the lubricating oil is easily compressed rapidly by the high-speed moving connecting rod, thus hindering the connecting rod's stroke. Utility Model Content

[0004] To solve the above-mentioned technical problems, this application provides an all-steel piston, which is designed with a through hole for oil to exit from the oil chamber, a crescent structure, and a groove structure that work together to enable an oil film to be quickly formed in the pin hole fit clearance during engine operation, thereby reducing the potential risk of pin seizure.

[0005] This application provides an all-steel piston, the specific technical solution of which is as follows: including a piston body, a piston pin hole and an internal oil cavity, wherein the inner wall of the piston pin hole is provided with two symmetrically distributed crescent-shaped structures and two groove structures; and the groove structures are connected to the crescent-shaped structures.

[0006] The piston body has at least two through holes, which connect the internal oil cavity with the inner cavity of the piston body. The through holes are symmetrically arranged in the inner cavity of the piston body.

[0007] Preferably, the straight-line length of the through hole from the center line of the long axis of the piston body is a, where a = b / 2 + 2, b is the width of the small end of the connecting rod, and the accuracy range of a is ±1. The units of a and b are millimeters.

[0008] Preferably, the crescent structure is a semi-crescent shape or a through crescent shape, and two crescent structures are arranged in a 180° array around the piston body axis on the inner wall of the piston pin hole.

[0009] Preferably, the crescent structure is arranged along the axial direction of the piston pin hole and is located on the horizontal center line of the piston pin hole.

[0010] Preferably, the crescent-shaped structure is positioned from the inner cavity of the piston body toward the groove structure, and is in communication with the groove structure.

[0011] Preferably, the through-type crescent-shaped structure extends through the entire inner wall of the piston pin hole.

[0012] Preferably, the groove structure is a half-groove or a full-groove; the two groove structures are symmetrically distributed on the piston body and are arranged around the inner walls of the two piston pin holes.

[0013] Preferably, the semi-groove is provided along the horizontal centerline of the piston pin hole, and the semi-groove is only provided on the non-load-bearing side of the lower surface of the piston pin hole.

[0014] Preferably, the arc length of the semi-groove is less than or equal to 1 / 2 of the circumference of the inner surface of the piston pin hole.

[0015] Preferably, the full-length groove is provided around the entire inner wall of the piston pin hole.

[0016] The all-steel piston provided by this utility model can better guide the cooling and lubricating oil in the oil chamber into the connecting rod and piston pin by setting a combination structure of through holes, crescents and grooves on the existing piston structure, so as to provide lubrication for the contact between the piston pin hole and the connecting rod and piston pin, and effectively reduce the risk of seizure; this solution takes into account both lightweight design and processing quality, while reducing the risk of piston failure in the engine. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application 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 only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a top view of the all-steel piston structure.

[0019] Figure 2 A cross-sectional view of the internal structure of an all-steel piston from a BB perspective.

[0020] Figure 3 This is a cross-sectional view from perspective A of the internal combination of the crescent-shaped structure and the full-groove assembly of the all-steel piston in one embodiment.

[0021] Figure 4An internal cross-sectional view of the combination of the all-steel piston through crescent-shaped structure and the half-groove in another embodiment from perspective A;

[0022] Figure 5 A cross-sectional view of the combination of the crescent-shaped structure and the semi-groove of the all-steel piston in another embodiment, from perspective A;

[0023] Figure 6 for Figure 5 A schematic diagram of the cross-sectional structure of the piston pin hole in an all-steel piston from a mid-CC perspective.

[0024] Figure Labels

[0025] All-steel piston: 1. Piston body; 2. Piston pin hole; 3. Internal oil cavity; 4. Crescent structure; 4.1. Half-crescent-shaped crescent structure; 4.2. Through-type crescent structure; 5. Groove structure; 5.1. Half-groove; 5.2. Full-groove; 6. Through hole. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0028] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" or "several" means two or more, unless otherwise explicitly specified.

[0030] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0031] The specific embodiments of this utility model are written in a way that presents multiple solutions in parallel.

[0032] See Figures 1 to 6 In this embodiment, the all-steel piston includes: a piston body 1, a piston pin hole 2, and an internal oil cavity 3;

[0033] like Figures 2 to 6 As shown, in this embodiment, two symmetrically distributed crescent-shaped structures 4 and two groove structures 5 are provided on the inner wall of the piston pin hole 2; and the groove structure 5 is connected to the crescent-shaped structure 4, so that the crescent-shaped structure 4 can guide part of the lubricating oil sprayed into the piston pin hole 2 into the mating gap of the piston pin hole 2 and the groove structure 5, thereby increasing the oil film formation speed and reducing the potential risk of pin seizure.

[0034] Furthermore, the piston body has at least two through holes 6. Specifically, the number of through holes 6 is an even number, symmetrically distributed within the piston body 1, as shown in the example below. Figure 1 As shown, in this embodiment, there are two sets of through holes 6. The through holes 6 connect the internal oil cavity 3 and the inner cavity of the piston body 1. The through holes 6 are symmetrically arranged in the inner cavity of the piston body 1. The center of the through holes 6 is arranged in the mating space area between the small end of the connecting rod and the piston pin seat wall. In this way, the cooling lubricating oil can be sprayed onto the piston pin through the through holes 6, thereby quickly forming an oil film in the mating gap of the piston pin hole 2.

[0035] Preferably, the location of the through hole 6 is further defined. In this embodiment, for example... Figure 1 and Figure 3As shown, the specific location of the through hole 6 is a straight-line distance from the center line of the major axis of the piston body 1, where a = b / 2 + 2, b is the width of the connecting rod small end, and the accuracy range of a is ±1. The units of a and b are millimeters. Through such calculation and arrangement, the through hole 6 is arranged in the mating space area between the connecting rod small end and the piston pin seat wall. In this way, the cooling and lubricating oil can be better sprayed onto the piston pin through the through hole 6, thereby quickly forming an oil film in the mating clearance of the piston pin hole 2 and achieving a lubrication effect.

[0036] Preferably, the types of the crescent-shaped structures 4 are further specified, such as... Figures 3 to 5 As shown, in this application, the crescent structure 4 has a semi-crescent shape 4.1 or a through crescent shape 4.2. Both of the crescent structures 4 are identical and appear simultaneously. They are arranged in a 180° array around the axis of the piston body 1 on the inner wall of the piston pin hole 2, and are symmetrically and evenly distributed to obtain a better lubrication effect.

[0037] More preferably, the location of the crescent structure 4 is further defined, such as... Figures 3 to 5 As shown in the present application, the crescent structure 4 is arranged along the axial direction of the piston pin hole 2 and is located on the horizontal center line of the piston pin hole 2, so that when the connecting rod moves back and forth, the lubricating oil flows more evenly through the crescent structure 4 into the fitting gap of the piston pin hole 2 and the groove structure 5.

[0038] Furthermore, the orientation of the crescent-shaped structure 4.1 is further defined, such as... Figure 3 and Figure 5 As shown in the present application, the crescent-shaped structure 4.1 is provided from the inner cavity of the piston body 1 to the groove structure 5 and communicates with the groove structure 5, so that the lubricating oil inside the piston body 1 can flow into the groove structure 5.

[0039] Furthermore, the arrangement of the through-type crescent-shaped structure 4.2 is further defined, such as... Figure 4 As shown in the present application, the through crescent-shaped structure 4.2 penetrates the entire inner wall of the piston pin hole 2.

[0040] Preferably, the type of the groove structure 5 is further defined, such as... Figures 3 to 5 As shown, in this application, the groove structure 5 is a half-groove 5.1 or a full-groove 5.1; the two groove structures 5 are symmetrically distributed on the piston body 1 and are arranged around the inner walls of the two piston pin holes 2 to achieve the lubrication of the piston pin holes 2.

[0041] Furthermore, the location of the semi-groove 5.1 is further defined, such as... Figure 4 and Figure 5 As shown, in this application, the semi-groove 5.1 is provided along the horizontal center line of the piston pin hole 2, and the semi-groove 5.1 is only provided on the non-load-bearing side of the lower surface of the piston pin hole 2, so as to achieve the formation of lubricating oil film in the piston pin hole 2 while having little impact on the pressure bearing of the piston pin hole 2.

[0042] Furthermore, the structure of the semi-groove 5.1 is further defined such that the arc length of the semi-groove 5.1 is less than or equal to 1 / 2 of the circumference of the inner surface of the piston pin hole 2.

[0043] Furthermore, the structure of the full-length trench 5.2 is further defined, such as... Figure 3 As shown, the full-length groove 5.2 is provided around the entire inner wall of the piston pin hole 2, which allows for a larger oil inlet space and better lubrication of the piston pin hole 2.

[0044] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An all-steel piston comprising a piston body, a piston pin bore and an internal oil cavity, characterized in that, The inner wall of the piston pin hole is provided with two symmetrically distributed crescent-shaped structures and two groove structures; and the groove structures are connected to the crescent-shaped structures. The piston body has at least two through holes, which connect the internal oil cavity with the inner cavity of the piston body. The through holes are symmetrically arranged in the inner cavity of the piston body.

2. The all-steel piston according to claim 1, characterized in that, The straight-line length of the through hole from the center line of the long axis of the piston body is a, where a = b / 2 + 2, b is the width of the small end of the connecting rod, and the accuracy range of a is ±1. The units of a and b are millimeters.

3. The all-steel piston of claim 1 wherein, The crescent structure is either a semi-crescent shape or a through crescent shape, and two crescent structures are arranged in a 180° array around the piston body axis on the inner wall of the piston pin hole.

4. The all-steel piston of claim 3, wherein The crescent structure is arranged along the axial direction of the piston pin hole and is located on the horizontal center line of the piston pin hole.

5. The all-steel piston of claim 4, wherein The crescent-shaped structure is positioned from the inner cavity of the piston body toward the groove structure, and is connected to the groove structure.

6. The all-steel piston of claim 5 wherein, The through-type crescent-shaped structure extends through the entire inner wall of the piston pin hole.

7. The all-steel piston of claim 1 wherein, The groove structure is a half-groove or a full-groove; the two groove structures are symmetrically distributed on the piston body and are arranged around the inner walls of the two piston pin holes.

8. The all-steel piston of claim 7, wherein The semi-groove is provided along the horizontal centerline of the piston pin hole, and the semi-groove is only provided on the non-load-bearing side of the lower surface of the piston pin hole.

9. The all-steel piston according to claim 8, characterized in that, The arc length of the semi-groove is less than or equal to 1 / 2 of the circumference of the inner surface of the piston pin hole.

10. The all-steel piston of claim 9, wherein The full-length groove is provided around the entire inner wall of the piston pin hole.

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