Search

CN-224229223-U - Piston pin and engine

CN224229223UCN 224229223 UCN224229223 UCN 224229223UCN-224229223-U

Abstract

The utility model provides a piston pin and an engine, wherein the piston pin comprises a pin body and a core body, the pin body is penetrated with a cylindrical inner cavity, the inner cavity and the pin body are coaxially arranged, two ends of the pin body are respectively provided with a first end face, and the ratio range of the inner diameter of the inner cavity to the outer diameter of the pin body is 0.9-0.95. The core body is cylindric, and the core body is established in the round pin body, and the circumference lateral wall of core body cooperatees with the circumference lateral wall of inner chamber, and the both ends of core body have the second terminal surface respectively, and the second terminal surface flushes the setting with the first terminal surface of corresponding one side, and the core body adopts the material that the density of comparing the round pin body is low to make. By designing the pin body into a thin-wall structure and filling the core body in the inner cavity of the pin body, the pin body bears main mechanical load, and the core body enhances the overall performance through stress dispersion and heat conduction. Because the two second end faces of the core body are respectively flush with the two first end faces of the pin body, the core body completely fills the inner cavity, and therefore the bearing capacity of the pin body with the thin-wall structure is improved.

Inventors

  • YAO JINGQI
  • LUO WEI

Assignees

  • 重庆润通科技有限公司

Dates

Publication Date
20260512
Application Date
20250605

Claims (7)

  1. 1. A wrist pin, comprising: A pin body (10) which is penetrated with a cylindrical inner cavity (11), wherein the inner cavity (11) and the pin body (10) are coaxially arranged, two ends of the pin body (10) are respectively provided with a first end face (12), the ratio of the inner diameter of the inner cavity (11) to the outer diameter of the pin body (10) is in the range of 0.9-0.95, and The pin body comprises a cylindrical core body (20) which is arranged in the pin body (10), wherein the circumferential outer side wall of the core body (20) is matched with the circumferential inner side wall of the inner cavity (11), two ends of the core body (20) are respectively provided with a second end face (21), the second end faces (21) are flush with the first end faces (12) on the corresponding side, and the core body (20) is made of a material with lower density than the pin body (10).
  2. 2. A wrist pin according to claim 1, characterized in that the core (20) is of solid construction.
  3. 3. The wrist pin according to claim 1, characterized in that the core (20) is made of an aluminium alloy material.
  4. 4. Piston pin according to claim 1, characterized in that the pin body (10) is made of a high-strength alloy steel material.
  5. 5. The piston pin according to claim 1, characterized in that the wall thickness of the pin body (10) is 0.5-1.0 mm.
  6. 6. The wrist pin according to claim 1, characterized in that the diameter of the core (20) is 18-19 mm.
  7. 7. An engine comprising a wrist pin according to any one of claims 1-6.

Description

Piston pin and engine Technical Field The utility model relates to the technical field of piston pins, in particular to a piston pin and an engine. Background The piston pin serves as a key connecting piece of the piston and the connecting rod and plays an important role in transmitting the explosion load of the combustion chamber and coordinating the reciprocating motion. However, the traditional piston pin generally adopts a thick-wall hollow structure made of a single metal material (such as 20CrMo alloy steel), but has the following remarkable defects that (1) the weight is overlarge, taking a certain gasoline engine piston pin as an example (the outer diameter is 20mm, the inner diameter is 13mm and the length is 62 mm), the weight of the traditional thick-wall hollow structure reaches 88g, and the traditional thick-wall hollow structure accounts for about 20% of the total mass of a piston group, so that the reciprocating inertia force is increased, and (2) the stress concentration risk is caused, and the thick-wall hollow structure is a stress concentration area in a pin hole contact area, so that fatigue cracks are easily initiated due to local stress concentration, and the service life is reduced. Based on this, a wrist pin having both weight reduction and high fatigue strength has been proposed. Disclosure of utility model Aiming at the defects in the prior art, the utility model aims to provide a piston pin and an engine, so as to achieve both light weight and high fatigue strength. In order to achieve the above purpose, the utility model provides a piston pin, which comprises a pin body, a cylindrical inner cavity and a cylindrical core body, wherein the inner cavity penetrates through the pin body, the inner cavity and the pin body are coaxially arranged, the two ends of the pin body are respectively provided with a first end face, the ratio of the inner diameter of the inner cavity to the outer diameter of the pin body ranges from 0.9 to 0.95, the cylindrical core body is arranged in the pin body, the circumferential outer side wall of the core body is matched with the circumferential inner side wall of the inner cavity, the two ends of the core body are respectively provided with a second end face, the second end faces are flush with the first end faces on the corresponding side, and the core body is made of a material with lower density than the pin body. Preferably, the core is a solid structure. Preferably, the core is made of aluminum alloy material. Preferably, the pin body is made of high-strength alloy steel. Preferably, the wall thickness of the pin body is 0.5-1.0 mm. Preferably, the diameter of the core body is 18-19 mm. The utility model also provides an engine comprising the piston pin. The utility model has the beneficial effects that: The utility model discloses a piston pin and an engine, wherein a pin body is designed into a thin-wall structure, a core body is filled in an inner cavity of the pin body, the pin body bears main mechanical load, and the core body enhances the overall performance through stress dispersion and heat conduction. Because the two second end faces of the core body are respectively flush with the two first end faces of the pin body, the core body completely fills the inner cavity, and therefore the bearing capacity of the pin body with the thin-wall structure is improved. Meanwhile, the core body is made of a material with lower density than the pin body and is matched with the pin body with the thin-wall structure, so that compared with a piston pin with a conventional thick-wall hollow structure, the piston pin is lighter in weight, smaller in reciprocating inertia force in the running process, and the engine efficiency is improved. Drawings In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale. FIG. 1 is a schematic cross-sectional view of a wrist pin according to an embodiment of the present utility model; FIG. 2 is a schematic cross-sectional view of a pin body; FIG. 3 is a diagram of a stress analysis of a piston pin of a conventional thick-walled hollow structure; FIG. 4 is a diagram of a stress analysis of a wrist pin of the present application; Reference numerals: 10. Pin body 11, inner cavity 12, first end face 20, core 21 and second end face. Detailed Description Embodiments of the technical scheme of the present utility model will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present utility model, and thus are merely examples, and are not intended to limit the sco