JPH068864U - Piston pin for internal combustion engine - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a piston pin for an internal combustion engine, which can be made lightweight and have sufficient rigidity, and can be easily manufactured at low cost. [Structure] The piston pin body 1 is formed in a thin-walled cylindrical shape,
A spiral reinforcing rib 2 is formed on the inner peripheral surface 1a of the piston pin body 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a piston pin for an internal combustion engine of an automobile or the like.

[0002]

[Prior art]

 Generally, a piston for an internal combustion engine is connected to a connecting rod via a piston pin.When the engine is operating, the piston for internal combustion engines receives the combustion gas pressure and slides in the cylinder bore while being supported by the crankshaft via the piston pin and the connecting rod. Although the piston pin moves, the piston pin slides and rotates in the piston pin hole due to the rotation of the piston pin, the swinging of the connecting rod, and the like, and is also subjected to bending and crushing force. For this reason, the piston pin must be sufficiently rigid against bending and crushing forces in all radial directions. Further, in order to reduce the weight of the internal combustion engine, it is necessary to reduce the weight of the piston pin as a constituent member thereof.

As such piston pins for internal combustion engines, there are conventionally those disclosed in Japanese Utility Model Laid-Open No. 61-55549 and 63-28958. As shown in FIG. 2, the former piston pin is formed by simply forming the piston pin body 10 into a cylindrical shape, and the latter piston pin is formed by inserting the piston pin body 11 into a hollow shape as shown in FIG. The piston pin body 11 is formed into a real shaft shape and a plurality of holes 12 are formed inside the piston pin body 11 to form the inside of the piston pin body 11 into a honeycomb shape.

[0004]

[Problems to be solved by the device]

 However, in the former piston pin, if the thickness of the piston pin body 10 is reduced to reduce the weight, sufficient rigidity cannot be ensured, and conversely, in order to ensure sufficient rigidity, the piston pin body 10 meat If the thickness is increased, the weight cannot be reduced.

In addition, in the latter piston pin, while it is possible to reduce the weight and secure the rigidity at the same time, it is not easy to manufacture, and the manufacturing man-hour increases, resulting in a high cost.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a piston pin for an internal combustion engine, which can be made lightweight and ensure sufficient rigidity, and can be easily manufactured at low cost. And

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the piston pin for an internal combustion engine of the present invention has a piston pin body formed in a thin cylindrical shape, and a spiral reinforcing rib is formed on the inner peripheral surface of the piston pin body.

[0008]

[Action]

 According to the above configuration, the piston pin main body is formed in a thin-walled cylindrical shape to reduce weight, and the spiral reinforcing rib formed on the inner peripheral surface of the piston pin main body is sufficient for bending and crushing force in all radial directions. Rigidity is secured.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 (1) is a longitudinal sectional view showing a piston pin for an internal combustion engine, and FIG. 1 (2) is a left side view of (1). In this figure, 1 is a piston pin body.

The piston pin main body 1 is formed of structural alloy steel or the like into a thin cylindrical shape, and a spiral reinforcing rib 2 is formed on the inner peripheral surface 1 a of the piston pin main body 1.

In the above structure, the piston pin is manufactured by forming a spiral groove by cutting on the inner peripheral surface of the thick-walled piston pin rough material, while forming the piston pin rough material on the outer peripheral surface. Is performed with high precision finishing.

In such a manufacturing process, it is easy to form the spiral groove, and the piston pin rough material is thinned at the forming portion, and at the same time, the spiral reinforcing rib 2 is engraved. Become.

The piston pin body 1 is formed in a thin-walled cylindrical shape to reduce its weight. Further, a spiral reinforcing rib 2 is formed on the inner peripheral surface 1a of the piston pin body 1 to ensure sufficient rigidity against bending and crushing force in all radial directions.

[0015]

[Effect of device]

 As described above, according to the present invention, the piston pin body is formed into a thin-walled cylindrical shape, and the spiral reinforcing rib is formed on the inner peripheral surface of the piston pin body, so that the weight can be reduced and bending can be performed in all radial directions. Sufficient rigidity against crushing force can be secured.

Further, since the reinforcing rib can be easily manufactured by cutting, the manufacturing efficiency can be improved and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a piston pin for an internal combustion engine which is an embodiment of the present invention. (2) It is a left side view of (1).

FIG. 2 is a vertical cross-sectional view showing a piston pin for an internal combustion engine which is one conventional example.

FIG. 3 (1) is a longitudinal sectional view showing another conventional example of a piston pin for an internal combustion engine. (2) It is a left side view of (1).

[Explanation of symbols]

 1 Piston pin body 1a Inner peripheral surface 2 Reinforcing rib

Claims (1)

[Scope of utility model registration request] 1. A piston pin for an internal combustion engine, wherein the piston pin body is formed in a thin-walled cylindrical shape, and a spiral reinforcing rib is formed on an inner peripheral surface of the piston pin body.