CN104533654A - engine piston - Google Patents

Abstract

The invention discloses an engine piston, which includes a piston body. The piston body is provided with an oil return passage connecting the bottom ring groove and a pin hole. The oil return channel of the hole can scrape off the excess oil on the cylinder wall through the piston ring and guide it between the pin hole and the pin shaft, and then lubricate the pin shaft and the pin hole to improve the lubrication performance.

Description

engine piston

technical field

The invention relates to engine components, in particular to an engine piston.

Background technique

The piston is the "heart" of the internal combustion engine. It cooperates with the piston cylinder and the cylinder head to form a combustion chamber. The combustible gas is burned in the combustion chamber to generate high-temperature and high-pressure gas to expand and do work, and then push the piston to move and drive the crankshaft to rotate and output torque. The requirements for power, economy, environmental protection and reliability are becoming more and more stringent. The piston has developed into a high-tech product integrating light-weight and high-strength new materials, special-shaped outer circle composite profiles, special-shaped pin holes and other new technologies. Products with technical content can ensure the heat resistance, wear resistance, stable guiding and good sealing function of the piston, reduce the friction work loss of the engine, and reduce fuel consumption, noise and emission. In the prior art, the piston is generally composed of a head, a skirt and a piston pin seat. The side wall of the head is provided with a ring groove for installing the piston ring, and the piston pin seat is provided with a pin hole for installing the pin shaft. When the piston goes up and down During movement, under normal circumstances, the combined oil ring scrapes off the excess oil on the cylinder wall and flows back to the oil pan. However, because the pin shaft and the pin hole are closely matched and are located inside the pin seat, it is generally splashed by lubricating oil. It can lubricate the pin hole and the pin shaft, but the regularity of sputtering when the oil is oscillating and surging is very poor, so it is difficult to guarantee the lubricating effect on the pin hole and the pin shaft.

Therefore, need a kind of engine piston, utilize the redundant engine oil on the cylinder wall to lubricate pin shaft and pin hole, improve lubricating performance.

Contents of the invention

In view of this, the object of the present invention is to provide an engine piston, which can lubricate the pin shaft and the pin hole by using the redundant engine oil on the cylinder wall, so as to improve the lubricating performance.

The engine piston of the present invention includes a piston body, and the piston body is provided with an oil return passage connecting the bottom ring groove and the pin hole;

Further, the oil return channel is a groove arranged along the side wall of the piston body;

Further, the depth of the groove is greater than the depth of the bottom ring groove;

Further, the wall of the pin hole is provided with a radially outwardly expanded oil separation groove corresponding to the lower end of the oil return passage for oil dispersion.

The beneficial effects of the present invention are: the engine piston of the present invention is provided with an oil return passage connecting the bottom ring groove and the pin hole on the piston body, and can scrape off excess oil on the cylinder wall through the piston ring and guide the pin hole and the pin hole. Between the shafts, and then lubricate the pin shaft and the pin hole to improve the lubrication performance.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a left side view of Fig. 1 .

Detailed ways

Fig. 1 is a schematic structural view of the present invention, and Fig. 2 is a left side view of Fig. 1, as shown in the figure: the engine piston of this embodiment includes a piston body 1, and the piston body 1 is provided with a bottom annular groove 2 and a pin The oil return passage 4 of the hole 3, the piston body 1 is provided with three ring grooves, the bottom ring groove 2 refers to the bottom ring groove, and the movement of the piston body 1 up and down can scrape the excess oil on the cylinder wall to the bottom ring groove 2, so part of the oil can be introduced into the pin hole 3 through the oil return passage 4, and then lubricate the pin shaft and the pin hole 3 to improve the lubrication performance.

In this embodiment, the oil return channel 4 is a groove arranged along the side wall of the piston body 1 , which is convenient for processing and can reduce the production cost of the piston body 1 .

In this embodiment, the depth of the groove is greater than that of the bottom annular groove 2, which not only creates enough space to accommodate the engine oil, but also facilitates the axial diffusion of the engine oil to the pin shaft.

In this embodiment, the wall of the pin hole 3 corresponds to the lower end of the oil return passage 4 and is provided with a radially outwardly expanded oil separation groove 5 for oil dispersion. The radially outwardly expanded means that the center of the pin hole 3 is the center diameter Expand outward, that is, the oil distribution groove 5 is formed by the depression of the hole wall of the pin hole 3, the oil distribution groove 5 is a strip groove arranged around the pin hole 3 circumferential direction, and the central angle of the oil distribution groove 5 is not less than 30°, which is beneficial to the engine oil along the The pin holes 3 are diffused circumferentially to improve the lubricating effect.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be carried out Modifications or equivalent replacements without departing from the spirit and scope of the technical solution of the present invention shall be covered by the claims of the present invention.

Claims (4)

1. an engine piston, is characterized in that: comprise piston only, and described piston only is provided with the back oil road being communicated with bottom annular groove and pin-and-hole.

2. engine piston according to claim 1, is characterized in that: described back oil road is the groove arranged along piston only sidewall.

3. engine piston according to claim 1, is characterized in that: the degree of depth of described back oil road is greater than the degree of depth of bottom annular groove.

4. engine piston according to claim 1, is characterized in that: the corresponding back oil road lower end of described pin-and-hole hole wall is provided with point oil groove for fluid dispersion that radial direction extends out.