Cast iron piston structure with an X-shaped hollow in the skirt

Abstract

The present invention discloses a cast iron piston structure with an X-shaped hollow in the skirt portion, which includes a piston skirt portion and a piston head; the piston skirt portion is arranged at the lower part of the cast iron piston structure; the piston head is arranged at the upper part of the cast iron piston structure; wherein the top of the piston skirt portion is fixedly connected to the bottom of the piston head, the piston skirt portion is in a cylindrical structure, and the piston skirt portion includes a piston pin hole and an X-shaped hollow; the central axis of the piston pin hole is vertically and intersectingly arranged with the central axis of the piston skirt portion; the X-shaped hollow is arranged on the cylindrical wall of the cylindrical structure of the piston skirt portion on both sides of the central axis of the piston pin hole. The cast iron piston structure with an X-shaped hollow in the skirt portion of the present invention can not only meet the requirements of high explosion pressure but also meet the requirements of lightweight.

Description

Technical Field

[0001] The present invention relates to the field of engine manufacturing, and particularly to a cast iron piston structure with an X-shaped hollow in the skirt part. Background Art

[0002] With the increasing requirements of social and economic activities for vehicle power performance, economy, adaptability, etc., the lightweight, safety, applicability, and power performance of vehicles and their components have become an improvement direction that has received extensive attention. Currently, pistons are generally made of cast aluminum. As the engine has higher and higher requirements for fuel economy and needs to increase the explosion pressure, the strength requirements for pistons are also getting higher and higher. Cast aluminum pistons obviously cannot meet the higher strength requirements, so steel pistons are adopted. However, since steel pistons are much heavier than cast aluminum pistons, they do not meet the lightweight requirements.

[0003] Therefore, aiming at the disadvantages of the current piston structure, there is an urgent need for a new piston structure to solve these disadvantages.

[0004] The information disclosed in this background art section is only intended to enhance the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of implication that this information constitutes the prior art already known to those of ordinary skill in the art. Summary of the Invention

[0005] The purpose of the present invention is to provide a cast iron piston structure with an X-shaped hollow in the skirt part, which can not only meet the requirements of high explosion pressure but also meet the lightweight requirements.

[0006] To achieve the above purpose, the present invention provides a cast iron piston structure with an X-shaped hollow in the skirt part, including a piston skirt and a piston head; the piston skirt is arranged at the lower part of the cast iron piston structure; the piston head is arranged at the upper part of the cast iron piston structure; wherein the top of the piston skirt is fixedly connected to the bottom of the piston head, the piston skirt is in a cylindrical structure, and the piston skirt includes a piston pin hole and an X-shaped hollow; the central axis of the piston pin hole is perpendicularly intersecting with the central axis of the piston skirt; the X-shaped hollow is arranged on the cylindrical wall of the cylindrical structure of the piston skirt on both sides of the central axis of the piston pin hole.

[0007] In a preferred embodiment, both ends of the piston pin hole include pin hole end faces, and the pin hole end faces are perpendicular to the central axis of the piston pin hole.

[0008] In a preferred embodiment, the piston skirt further includes a first connecting part and a second connecting part; the first connecting part is arranged at the connection of the cylindrical wall of the cylindrical structure where the X-shaped hollow is located and the pin hole end face; the second connecting part is arranged at the connection of the top of the hole wall of the piston pin hole and the bottom of the piston head.

[0009] In a preferred embodiment, the stiffness of the first connecting portion is less than the height of the piston skirt.

[0010] In a preferred embodiment, the length of the central connection line of the X-shaped hollow on both sides of the central axis of the piston pin hole is greater than the length of the piston pin hole.

[0011] In a preferred embodiment, the height of the X-shaped hollow is less than the width of the X-shaped hollow.

[0012] In a preferred embodiment, the central connection line of the X-shaped hollow on both sides of the central axis of the piston pin hole is perpendicular to both the central axis of the piston pin hole and the central axis of the piston skirt and intersects at the same point.

[0013] In a preferred embodiment, the cast iron piston structure with an X-shaped hollow in the skirt further includes a combustion chamber provided at the top center of the piston head.

[0014] In a preferred embodiment, the piston head includes a plurality of ring grooves provided on the outer circumference of the piston head.

[0015] In a preferred embodiment, the number of the plurality of ring grooves is at least three.

[0016] Compared with the prior art, the cast iron piston structure with an X-shaped hollow in the skirt of the present invention has the following beneficial effects: The piston skirt of this solution is designed as a thin-walled cylindrical structure. The two ends of the piston pin hole are piston end faces perpendicular to the piston pin hole. On both sides of the central axis of the piston pin hole, there are symmetrically arranged cylindrical walls with X-shaped hollows, and the diameter of the cylindrical walls with X-shaped hollows is greater than the length of the piston pin hole. The cylindrical walls with X-shaped hollows are connected to the pin hole end face through a first connecting portion, and the height of the first connecting portion is less than the height of the cylindrical walls with X-shaped hollows. The bottom surface of the piston head is connected to the upper cylindrical wall of the piston pin hole through a second connecting portion. The cast iron piston structure of this solution has a simple and reasonable structure and can meet the requirements of high explosion pressure and lightweight engines. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a front view structural schematic diagram of a cast iron piston structure according to an embodiment of the present invention;

[0018] Figure 2 is Figure 1 the X-X cross-sectional structural schematic diagram of;

[0019] Figure 3 is a side view structural schematic diagram of a cast iron piston structure according to an embodiment of the present invention;

[0020] Figure 4 is Figure 3 the Y-Y cross-sectional structural schematic diagram of;

[0021] Figure 5 It is a bottom view structural schematic diagram of a cast iron piston structure according to an embodiment of the present invention.

[0022] Description of main reference numerals:

[0023] 1 - piston skirt, 101 - X-shaped hollow, 102 - first connecting portion, 103 - second connecting portion, 2 - piston head, 201 - ring groove, 3 - combustion chamber, 4 - piston pin hole, 401 - pin hole end face. Detailed implementation manners

[0024] The following will describe in detail the specific implementation manners of the present invention in conjunction with the accompanying drawings. However, it should be understood that the protection scope of the present invention is not limited by the specific implementation manners.

[0025] Unless otherwise clearly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "having" etc. will be understood to include the stated elements or components, without excluding other elements or other components.

[0026] As Figures 1 to 5 shown, a cast iron piston structure with an X-shaped hollow in the skirt according to a preferred embodiment of the present invention mainly includes a piston skirt 1 and a piston head 2. The piston skirt 1 is arranged at the lower part of the cast iron piston structure. The piston head 2 is arranged at the upper part of the cast iron piston structure. Among them, the top of the piston skirt 1 is fixedly connected to the bottom of the piston head 2. The piston skirt 1 has a cylindrical structure. The piston skirt 1 includes a piston pin hole 4 and an X-shaped hollow 101. The central axis of the piston pin hole 4 is vertically and intersectingly arranged with the central axis of the piston skirt 1. The X-shaped hollow 101 is arranged on the cylindrical wall of the cylindrical structure of the piston skirt 1 on both sides of the central axis of the piston pin hole 4. The cylindrical wall of the cylindrical structure in this embodiment is an arc-shaped cylindrical wall, but the present invention is not limited thereto.

[0027] In some embodiments, both ends of the piston pin hole 4 include a pin hole end face 401, and the pin hole end face 401 is vertically arranged with the central axis of the piston pin hole 4. The piston pin hole 4 and the pin hole end face 401 are used to connect the small end of the crank connecting rod.

[0028] In some embodiments, the piston skirt 1 further includes a first connecting portion 102 and a second connecting portion 103. The first connecting portion 102 is arranged at the connection of the cylindrical wall of the cylindrical structure where the X-shaped hollow 101 is located and the pin hole end face 401. The second connecting portion 103 is arranged at the connection of the top of the hole wall of the piston pin hole 4 and the bottom of the piston head 2.

[0029] In some embodiments, the stiffness of the first connecting portion 102 is less than the height of the piston skirt 1. The length of the central connection line of the X-shaped hollow 101 on both sides of the central axis of the piston pin hole 4 is greater than the length of the piston pin hole 4. The height of the X-shaped hollow 101 is less than the width of the X-shaped hollow 101. However, the present invention is not limited thereto. The heights of piston skirts 1 with different specifications and dimensions are different, and the height-width ratio of the X-shaped hollow 101 will also change accordingly.

[0030] In some embodiments, the central connection line of the X-shaped hollow 101 on both sides of the central axis of the piston pin hole 4 in this embodiment is perpendicular to both the central axis of the piston pin hole 4 and the central axis of the piston skirt 1 and intersects at the same point. This symmetric design can ensure the stability of the piston during high-speed reciprocating motion and the force-bearing strength of the piston itself. However, the present invention is not limited thereto. The symmetric structure of piston structures with different specifications will change accordingly. For example, but not limited to, the central connection line of the X-shaped hollow 101 on both sides of the central axis of the piston pin hole 4 is perpendicular to both the central axis of the piston pin hole 4 and the central axis of the piston skirt 1, but may not intersect at the same point.

[0031] In some embodiments, the cast iron piston structure with an X-shaped hollow in the skirt further includes a combustion chamber 3 provided at the center of the top of the piston head 2.

[0032] In some embodiments, the piston head 2 includes a plurality of ring grooves 201 provided on the outer circumference of the piston head 2, and the number of the plurality of ring grooves 201 is at least three.

[0033] In summary, the cast iron piston structure with an X-shaped hollow in the skirt of the present invention has the following advantages: The piston skirt of this solution is designed as a thin-walled cylindrical structure. The two ends of the piston pin hole are piston end faces perpendicular to the piston pin hole. On both sides of the central axis of the piston pin hole, there are symmetrically arranged cylindrical walls with X-shaped hollows, and the diameter of the cylindrical walls with X-shaped hollows is greater than the length of the piston pin hole. The cylindrical wall with an X-shaped hollow is connected to the pin hole end face through a first connecting portion, and the height of the first connecting portion is less than the height of the cylindrical wall with an X-shaped hollow. The bottom surface of the piston head is connected to the upper cylindrical wall of the piston pin hole through a second connecting portion. The cast iron piston structure of this solution has a simple and reasonable structure and can meet the requirements of high explosion pressure and lightweight engines.

[0034] The foregoing description of the specific exemplary embodiments of the present invention is for purposes of illustration and exemplification. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many modifications and variations are possible in light of the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the invention and its practical applications, so that those skilled in the art can implement and utilize the various different exemplary embodiments of the invention, as well as various different selections and modifications. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. A cast iron piston structure with an X-shaped hollow in the skirt, characterized in that, it includes: A piston skirt, which is arranged at the lower part of the cast iron piston structure; and A piston head, which is arranged at the upper part of the cast iron piston structure; wherein the top of the piston skirt is fixedly connected to the bottom of the piston head, the piston skirt is in a cylindrical structure, and the piston skirt includes: A piston pin hole, the central axis of which is vertically and intersectingly arranged with the central axis of the piston skirt; and An X-shaped hollow, which is arranged on the cylindrical wall of the cylindrical structure of the piston skirt on both sides of the central axis of the piston pin hole; wherein, both ends of the piston pin hole include pin hole end faces, which are perpendicular to the central axis of the piston pin hole; The piston skirt further includes: A first connecting part, which is arranged at the junction of the cylindrical wall of the cylindrical structure where the X-shaped hollow is located and the pin hole end face; and A second connecting part, which is arranged at the junction of the top of the hole wall of the piston pin hole and the bottom of the piston head; The stiffness of the first connecting part is less than the height of the piston skirt; The length of the central connection line of the X-shaped hollows on both sides of the central axis of the piston pin hole is greater than the length of the piston pin hole; This cast iron piston structure with an X-shaped hollow in the skirt further includes a combustion chamber, which is arranged at the center of the top of the piston head.

2. The cast iron piston structure with an X-shaped hollow in the skirt according to claim 1, characterized in that, the height of the X-shaped hollow is less than the width of the X-shaped hollow.

3. The cast iron piston structure with an X-shaped hollow in the skirt according to claim 1, characterized in that, the central connection line of the X-shaped hollows on both sides of the central axis of the piston pin hole is perpendicular to both the central axis of the piston pin hole and the central axis of the piston skirt and intersects at the same point.

4. The cast iron piston structure with an X-shaped hollow in the skirt according to claim 1, characterized in that, the piston head includes a plurality of ring grooves, which are arranged on the outer circumference of the piston head.

5. The cast iron piston structure with an X-shaped hollow in the skirt according to claim 4, characterized in that, the number of the plurality of ring grooves is at least three.

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