CN203515848U - Engine piston - Google Patents

Abstract

The utility model discloses an engine piston which comprises a piston body. The piston body comprises a piston head and a piston skirt, wherein an inner-cooling oil channel is formed in the piston head, an inner-cooling oil channel feed hole and an inner-cooling oil channel oil return hole are formed in the inner-cooling oil channel, the piston skirt is provided with a piston pin hole, a plurality of pin seat lubrication oil channels are formed in the piston body, and the pin seat lubricating oil channels are communicated with the inner-cooling oil channel and the piston pin hole. According to the engine piston, forced lubrication is provided for the piston pin hole, the instability of splash lubrication can be overcome effectively, and the reliability of lubrication can be improved.

Description

engine piston

technical field

The utility model relates to the technical field of engines, in particular to an engine piston.

Background technique

The piston is one of the important parts of the engine. The piston is divided into cast iron piston, steel piston, aluminum alloy piston and combined piston according to the material. The piston includes the piston head and the piston skirt. The piston head and the piston skirt are generally made of way of friction welding. When the engine is working, lubrication is required between the piston pin hole and the piston pin as well as between the connecting rod and the piston pin. As shown in Figure 1, it is an existing technical solution for pin-hole lubrication. The piston includes a piston body 1, a combustion chamber 2, an internal cooling oil passage 3, and a piston inner cavity 4. The oil hole 5 runs through the internal cooling oil passage 3 to the Piston chamber 4. The lubricating oil flows from the internal cooling oil passage 3 through the oil hole 5 and the piston inner cavity 4 to the upper surface of the connecting rod 6 and the outer surface of the piston pin 7, and then the pumping action generated by the movement of the piston pin 7 in the pin hole will flow The lubricating oil suction around the orifice of the distribution hole acts as lubrication. In the piston with the above structure, splash lubrication is used to lubricate the pin hole of the piston. The lubricating oil splashes around the pin hole, and the lubricating oil is introduced into the pin hole by using the pump suction between the piston pin hole and the piston pin to lubricate the pin hole. The disadvantages of this technology are: the amount of splashing oil is unstable, and the amount of lubricating and cooling oil is difficult to guarantee. When the thermal load of the piston is high, the amount of lubricating and cooling oil cannot meet the requirements, which may easily cause the piston pin and pin hole to lock.

Utility model content

The technical problem to be solved by the utility model is: to provide an engine piston, which can provide forced lubrication for the piston pin hole, which can effectively solve the instability of splash lubrication and improve the reliability of lubrication.

In order to solve the above technical problems, the technical solution of the utility model is: the engine piston includes a piston body, the piston body includes a piston head and a piston skirt, the piston head is provided with an internal cooling oil passage, and the internal cooling The oil passage has an oil inlet hole of an internal cooling oil passage and an oil return hole of an internal cooling oil passage. The piston skirt is provided with a piston pin hole, and the piston body is provided with several pin seat lubricating oil passages. The pin seat lubricating oil The channel communicates with the internal cooling oil channel and the piston pin hole.

Preferably, there are four pin seat lubricating oil passages arranged in a circle around the axis of the piston, and each of the pin seat lubricating oil passages extends axially along the piston.

Adopting the above technical scheme, the beneficial effect of the utility model is: since the piston piston body is provided with several pin seat lubricating oil passages, the pin seat lubricating oil passages communicate with the internal cooling oil passage and the piston pin hole to guide the flow of lubricating oil, for The piston pin hole provides forced lubrication, which can effectively solve the instability of splash lubrication and improve the reliability of lubrication.

Description of drawings

Fig. 1 is the structural representation of engine piston in the prior art;

Fig. 2 is the structural representation of the utility model embodiment;

Fig. 3 is the top view of Fig. 2;

Among them: 1. Piston body; 2. Combustion chamber; 3. Internal cooling oil passage; 4. Piston cavity; 5. Oil hole; 6. Connecting rod; 7. Piston pin; 8. Piston head; 9. Piston skirt 10, lubricating oil channel of pin seat; 31, oil inlet hole of internal cooling oil channel; 32, oil return hole of internal cooling oil channel; 91, piston pin hole.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Commonly shown in Figure 2 and Figure 3, the engine piston includes a piston body 1, the piston body 1 includes a piston head 8 and a piston skirt 9, the piston head 8 is provided with an internal cooling oil passage 3, and the internal cooling oil passage 3 has The oil inlet hole 31 of the inner cooling oil passage and the oil return hole 32 of the inner cooling oil passage, the piston skirt 9 is provided with a piston pin hole 91, and the piston body 1 is provided with several pin seat lubricating oil passages 10, and the pin seat lubricating oil passages 10 are connected to each other. Internal cooling oil passage 3 and piston pin hole 91.

In this embodiment, there are four lubricating oil passages 10 for the pin seat, which are arranged circularly around the axis of the piston body 1 , and each lubricating oil passage 10 for the pin seat extends axially along the piston body 1 .

In the utility model, the lubricating oil channel 10 of the pin seat connects the internal cooling oil channel 3 and the piston pin hole 91, guides the flow direction of the lubricating oil, and provides forced lubrication for the piston pin hole 91, which can effectively solve the instability of splash lubrication and improve the lubrication efficiency. reliability.

The utility model is not limited to the above-mentioned specific implementation manners, and various transformations made by those skilled in the art starting from the above-mentioned ideas without creative work all fall within the protection scope of the utility model.

Claims (2)

1. engine piston, comprise piston only, described piston only comprises piston crown and piston skirt, described piston crown is provided with interior oil cooling passage, described interior oil cooling passage has interior oil cooling passage oil inlet hole and interior oil cooling passage spill port, and described piston skirt is provided with piston pin hole, it is characterized in that, described piston only is provided with some key seat grease channels, and described key seat grease channel is communicated with described interior oil cooling passage and piston pin hole.

2. engine piston as claimed in claim 1, is characterized in that, described key seat grease channel has four and to take the axis of described piston be center of circle annular arrangement, and described in each, key seat grease channel all extends axially along described piston.

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