Trapezoidal contact piston structure

Abstract

The utility model discloses a trapezoidal contact piston structure, relates to the technical field of pistons, and solves the technical problem that the improvement of the efficiency of an engine is influenced due to larger friction loss caused by larger shape area of a skirt part of an existing piston. Comprising a piston head and a piston skirt part, the piston skirt part is composed of a skirt top, a skirt bottom and a skirt edge, the skirt top is connected with the center of the lower surface of the piston head, the section of the skirt top is larger than that of the skirt bottom, the skirt edge is located between the skirt top and the skirt bottom, the skirt top, the skirt bottom and the skirt edge are integrally formed, and the skirt edge is of a conical cylindrical surface structure and has a trapezoidal section. The two sides of the section of the skirt edge are symmetrically arranged, and the two sides of the section of the skirt edge incline inwards. According to the utility model, the traditional piston skirt is improved from a cylindrical surface arc-shaped structure to an inwards inclined conical cylindrical surface structure, so that the shape area of the piston skirt part is effectively reduced, the overall weight of the piston can be reduced, the friction loss of an engine is reduced, and the efficiency of the engine is favorably improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of pistons, in particular to a trapezoidal contact piston structure. Background Art

[0002] The piston is a hollow cylinder that slides in the cylinder. Its outer diameter is approximately equal to the inner diameter of the cylinder. It is mainly used to withstand the combustion pressure in the cylinder and transmit this force to the crankshaft through the piston pin and the connecting rod. In addition, the piston forms a combustion chamber together with the cylinder head and the cylinder wall. The structure of the piston is mainly divided into the top, the head and the skirt. The top of the piston is the main part of the combustion chamber. Its shape is related to the selected combustion chamber form. The piston head is the part above the piston pin seat. The piston ring is installed to prevent high-temperature and high-pressure gas from entering the crankcase and prevent the oil from entering the combustion chamber. All parts below the piston ring groove are called piston skirts. The piston works under high temperature, high pressure, high speed and poor lubrication. Therefore, its design and material selection are very important. The material of the piston usually has sufficient heat resistance, wear resistance and strength to ensure that it can work stably and reliably in harsh working environments. There are many types of pistons. According to different application environments and requirements, the design and structure of the piston will also be different. For example, internal combustion engine pistons, compressor pistons and hydraulic pistons, etc., each play an important role in their specific application fields.

[0003] The shape of the piston skirt is usually a cylinder. The piston skirt and the inner wall of the cylinder body form a sealed space to ensure that the reciprocating motion of the piston in the cylinder body can effectively realize the compression, combustion and discharge of the working medium in the cylinder. In order to ensure the sealing between the piston and the cylinder body, the piston skirt usually needs to form an extremely precise fitting gap with the inner wall of the cylinder body.

[0004] Since the piston skirt is usually a cylindrical structure, the shape and area of ​​the piston skirt are relatively large, which leads to greater friction losses, thereby affecting the improvement of engine efficiency. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a trapezoidal contact piston structure, which solves the problem that the existing piston skirt has a large area, resulting in large friction loss, thereby affecting the improvement of engine efficiency.

[0006] To achieve the above-mentioned purpose, according to an embodiment of the first aspect of the utility model, a trapezoidal contact piston structure is proposed, including a piston head and a piston skirt, wherein the piston skirt is composed of a skirt top, a skirt bottom and a skirt edge, wherein the skirt top is connected to the center of the lower surface of the piston head, and the cross-section of the skirt top is larger than the cross-section of the skirt bottom, the skirt edge is located between the skirt top and the skirt bottom, and the skirt top, skirt bottom and skirt edge are integrally formed, and the skirt edge is a conical cylindrical structure, and the cross-section of the skirt edge is a trapezoid.

[0007] As a further technical solution of the utility model, both sides of the cross section of the skirt are symmetrically arranged, and both sides of the cross section of the skirt are inclined inwards.

[0008] As a further technical solution of the utility model, ribs are symmetrically installed between the piston head and the piston skirt.

[0009] As a further technical solution of the utility model, the inward inclination angle of both sides of the cross section of the skirt is 7°.

[0010] As a further technical solution of the present invention, the skirt bottom is in an arc-shaped structure near the two ends, and the middle part of the skirt bottom is in a flat structure.

[0011] As a further technical solution of the utility model, the top end of the rib is fixedly connected to the lower surface of the piston head, and one side of the rib is fittedly connected to the side surface of the skirt.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] In the utility model, by designing the skirt edge of the piston skirt to be an inwardly inclined conical cylindrical structure, compared with the original cylindrical arc structure, not only the shape area of ​​the piston skirt is effectively reduced, but also the overall weight of the piston can be reduced, thereby reducing the friction loss of the engine, which is beneficial to improving the efficiency of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the piston structure in the prior art;

[0015] Figure 2 It is a schematic diagram of the structure of a piston skirt in the prior art;

[0016] Figure 3 This is a structural schematic diagram of a trapezoidal contact piston structure of the utility model;

[0017] Figure 4 The utility model is a schematic structural diagram of a piston skirt in a trapezoidal contact piston structure.

[0018] In the figure: 1. piston head; 2. piston skirt; 201. skirt top; 202. skirt bottom; 203. skirt edge; 3. rib plate. DETAILED DESCRIPTION

[0019] The technical solution of the utility model will be described clearly and completely in conjunction with the embodiments below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] like Figure 1-4 As shown, a trapezoidal contact piston structure includes a piston head 1 and a piston skirt 2, wherein the piston skirt 2 is composed of a skirt top 201, a skirt bottom 202 and a skirt edge 203, wherein the skirt top 201 is connected to the center of the lower surface of the piston head 1, and the cross section of the skirt top 201 is larger than the cross section of the skirt bottom 202, the skirt edge 203 is located between the skirt top 201 and the skirt bottom 202, and the skirt top 201, the skirt bottom 202 and the skirt edge 203 are integrally formed, the skirt bottom 202 is an arc structure near both ends, and the middle part of the skirt bottom 202 is a plane structure. This design enables the skirt bottom 202 to better adapt to the shape of the cylinder when the piston moves in the cylinder, reduces collision and friction with the cylinder wall, and improves the durability of the piston and the performance of the engine.

[0021] Compared with the piston skirt of cylindrical arc structure in the prior art (refer to Figure 1-2 ), in this embodiment, the skirt 203 is a tapered cylindrical structure, and the cross-section of the skirt 203 is a trapezoid, which not only effectively reduces the shape area of ​​the piston skirt 2, but also reduces the overall weight of the piston, thereby reducing the friction loss of the engine, which is beneficial to improving the efficiency of the engine. The two sides of the cross-section of the skirt 203 are symmetrically arranged, and the two sides of the cross-section of the skirt 203 are inclined inwardly, and the inward inclination angle of the two sides of the cross-section of the skirt 203 is 7°.

[0022] Ribs 3 are symmetrically installed between the piston head 1 and the piston skirt 2. The ribs 3 not only enhance the overall structural strength of the piston so that it can withstand higher working pressures, but also play a guiding and stabilizing role when the piston moves, thereby ensuring that the piston moves smoothly and accurately in the cylinder. The top of the rib 3 is fixedly connected to the lower surface of the piston head 1, and one side of the rib 3 is fittedly connected to the side of the skirt 203. This connection method enables the rib 3 to more effectively transfer the force of the piston head 1 to the skirt 203, thereby improving the overall working performance of the piston.

[0023] The working principle of the utility model is as follows: the piston skirt with the original cylindrical arc structure is designed as a conical cylindrical structure with both sides inclined inwards, and the improved piston skirt 2 is composed of a skirt top 201, a skirt bottom 202 and a skirt edge 203. The skirt edge 203 is a conical cylindrical structure with both sides inclined inwards, which not only effectively reduces the shape area, but also reduces the overall weight of the piston, thereby reducing the friction loss of the engine, which is beneficial to improving the efficiency of the engine.

[0024] The above embodiments are only used to illustrate the technical method of the utility model rather than to limit it. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical method of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the utility model.

Claims

1. A trapezoidal contact piston structure, comprising a piston head (1) and a piston skirt (2), characterized in that: The piston skirt (2) is composed of a skirt top (201), a skirt bottom (202) and a skirt edge (203); the skirt top (201) is connected to the center of the lower surface of the piston head (1), and the cross section of the skirt top (201) is larger than the cross section of the skirt bottom (202); the skirt edge (203) is located between the skirt top (201) and the skirt bottom (202); the skirt top (201), the skirt bottom (202) and the skirt edge (203) are integrally formed; the skirt edge (203) is a tapered cylindrical structure, and the cross section of the skirt edge (203) is a trapezoid.

2. A trapezoidal contact piston structure according to claim 1, characterized in that: The two sides of the cross section of the skirt (203) are symmetrically arranged, and both sides of the cross section of the skirt (203) are inclined inwards.

3. A trapezoidal contact piston structure according to claim 1, characterized in that: Ribs (3) are symmetrically installed between the piston head (1) and the piston skirt (2).

4. A trapezoidal contact piston structure according to claim 2, characterized in that: The inwardly inclined angle of both sides of the cross section of the skirt (203) is 7°.

5. The trapezoidal contact piston structure according to claim 1, characterized in that: The skirt bottom (202) is in an arc-shaped structure at positions close to both ends, and the middle portion of the skirt bottom (202) is in a flat structure.

6. A trapezoidal contact piston structure according to claim 3, characterized in that: The top end of the rib plate (3) is fixedly connected to the lower surface of the piston head (1), and one side of the rib plate (3) is fitted and connected to the side surface of the skirt (203).

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