JPH04136356U - Piston for internal combustion engine - Google Patents

Abstract

(57) [Summary] [Purpose] The end of the pin boss portion of the piston body is moved back from the outer periphery of the piston body toward the center, and a recess for thinning is provided between the pin boss portion and the land portion to promote weight reduction. An object of the present invention is to provide a piston for an internal combustion engine that can handle high output by providing an oil supply structure in the piston pin hole. [Structure] The end of the pin boss portion 16 of the piston body 10 is retreated from the outer periphery of the piston body 10 toward the center, and a recessed portion 17 for thinning is provided between the retreated pin boss portion 16 and the land portion 13. A boss part 18 that connects the pin boss part 16 and the land part 13 is integrally provided in a part of the recessed part 17 for thinning, and the lubricating oil from the oil ring groove 12 is supplied to the piston pin into the boss part 18. The structure is such that an oil passage 19 for supplying oil into the hole 15 is provided.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea relates to pistons for internal combustion engines, and is particularly designed to reduce weight and , relates to a piston for internal combustion engines that enables high output.

0002

[Conventional technology]

Generally, in pistons for internal combustion engines, a One or more pressure rings and one or more oil rings via girder ring grooves. are mounted parallel to each other, with an oil ring usually located below the pressure ring. Ru.

0003 When the piston moves down (up) inside the cylinder, the oil ring The oil ring moves up and down in the groove due to sliding resistance with the inner liner, and the upper surface of the oil ring groove (lower surface) and scrapes unnecessary lubricating oil from the cylinder liner to form an oil film. Remove it and prevent it from flowing into the combustion chamber.

0004 Furthermore, conventionally, as a piston for an internal combustion engine, as shown in FIG. The oil ring groove 2 and the piston pin hole 3 are communicated with each other through a plurality of oil passages 4, The lubricating oil scraped off by the oil ring passes through this oil passage 4 to the piston pin hole 3. Achieves good lubrication between the piston pin hole 3 and the piston pin. I try to do that.

[0005] By the way, recently, in order to reduce the weight of pistons for internal combustion engines, as shown in Fig. 5, 2. Insert the end 5a of the pin boss portion 5 that opens the piston pin hole 3 into the outside of the piston body. Move it back from the periphery to the center side, remove the thickness, and remove the piston pin boss part 5. A lightweight piston for internal combustion engines is proposed that has a recessed part 7 between it and the land part 6. (Refer to Utility Model Application No. 115562/1983).

[0006]

[Problem that the idea aims to solve]

Therefore, as shown in FIG. In a lightweight internal combustion engine piston with a recess 7, the piston piston Lubricating oil is applied to provide good lubrication to the piston pin inserted into the piston hole 3. It is not possible to form the oil passage 4 to supply oil, and although weight reduction can be achieved, the piston The lubrication function of the engine pin is poor, and it is a major obstacle in promoting high output and high rotation speed of internal combustion engines. It was causing harm.

[0007] This idea was made in view of these circumstances, and it is possible to insert the piston pin into the The end of the pin boss part of the piston body is moved back toward the center, and the pin boss part A recessed part for thinning is provided between the land part and the piston for internal combustion engines to reduce weight. By providing sufficient lubrication function to the piston pin, high output and high rotation speed can be achieved. An object of the present invention is to provide a piston for an internal combustion engine that makes possible the following.

[0008]

[Means to solve the problem]

In order to achieve the above object, the present invention has developed a pin boss section into which a piston pin is inserted. While retracting the end from the outer periphery of the piston body toward the center of the piston, A lightweight internal combustion engine with a recessed part for thinning between the land part and the land part on the outer periphery of the piston. In the piston for use, the pin boss part and the land part are connected to a part of the recessed part for thinning. A boss portion is provided for the land portion, and the boss portion is provided with a land portion or an oval formed on the land portion. Oil passage that supplies lubricating oil from the bottom of the oil ring groove to the piston pin hole of the pin boss. It is characterized by the formation of

[0009]

[Effect]

As is clear from the above configuration, the piston operates inside the engine, and the Oil that adheres to the cylinder liner while descending due to firing pressure is removed from the oil ring. The boss part is scraped up by the pin boss part and the land part. In order to provide a land area using this boss part or oil formed on this land part. An oil passage is formed to supply lubricating oil from the bottom of the ring groove to the piston pin hole in the pin boss. Through this oil passage, lubricating oil is supplied to the piston pin hole, Provides good lubrication between the inner peripheral surface of the piston pin hole and the outer peripheral surface of the piston pin. .

0010

【Example】

An embodiment of this invention will be described in detail below with reference to FIGS. 1 to 3. .

[0011] Figure 1 is a front view showing a piston for an internal combustion engine according to the present invention, and Figure 2 is a front view of a piston for an internal combustion engine according to the present invention. Figure 3 is a side sectional view showing the main parts of the piston, and Figure 3 is a bottom view showing the main parts of the piston for the internal combustion engine. It is a diagram.

0012 In the drawing, a piston body 10 for use in a piston for an internal combustion engine according to the present invention is shown. is equipped with a head part 11 that constitutes the lower surface of the combustion chamber, a pressure ring, an oil ring, etc. A land portion 13 with a ring groove 12 provided on its outer periphery, and a ring groove 12 provided below the land portion 13. A piston pin (not shown) is attached to the skirt portion 14 located on the side and the piston body 10. A pin boss portion 16 is provided with a piston pin hole 15 into which the piston pin hole 15 is inserted.

[0013] Furthermore, the pinton body 10 according to the present invention has the advantages of FIGS. 2 and 3 in achieving weight reduction. As shown in FIG. By retracting it toward the center, it is possible to reduce the weight by cutting out the thickness, and also to reduce the weight of the pin boss part 16. Further weight reduction can be achieved by installing a recessed part 17 between the land part 13 and the land part 13. This is the configuration that aims to achieve this.

[0014] Furthermore, in the present invention, lubricating oil is applied into the piston pin hole 15 of the pin boss portion 16. In order to supply the material effectively, a pin boss part 16 and a land part are provided in a part of the hollow part 17 for thinning. A boss portion 18 is provided which connects the oil passage 19 to the oil passage 19. is provided, and the piston piston is inserted from the bottom surface of the oil ring groove 12 through this oil passage 19. Lubricating oil is supplied to the inner circumferential surface of the inlet hole 15.

[0015] In addition, the reference numeral 20 in the figure indicates an apron connecting the pin boss part 16 and the skirt part. vinegar.

[0016] Since the present invention is configured as described above, when the internal combustion engine is operating, the head portion 1 The upper surface of 1 moves up and down under combustion pressure, and when the piston descends, it enters the oil ring groove 12. The inserted oil ring scrapes lubricating oil from the cylinder liner. The removed lubricating oil flows into the piston pin hole 15 through the oil supply hole 19 provided in the boss portion 18. lubrication between the inner circumferential surface of the piston pin hole 15 and the piston pin is carried out smoothly. be called.

[0017] In this way, the lubrication between the inner circumferential surface of the piston pin hole 15 and the piston pin is smoothly achieved. It is done.

[0018] In this way, the end of the pin boss portion 16 provided on the piston body 10 is placed toward the center. and a recess 17 for thinning is provided between the pin boss portion 16 and the land portion 13. In addition to achieving weight reduction, an oil passage 19 is provided in this recess 17 for thinning. Since the structure includes a boss portion 18 for arranging the At the same time, it has high practical value and is durable enough to withstand high output and high rotation speeds. We can provide pistons for combustion engines.

[0019]

[Effect of the idea]

As explained above, the piston for internal combustion engines according to the present invention is provided in the piston body. While retracting the end of the pin boss part from the outer periphery of the piston body toward the center, , by installing a recess for lightening between the pin boss part and the land part to significantly reduce weight. In both cases, a boss part is installed to arrange an oil passage in this recessed part for oil removal. Since the lubricating oil is supplied from the lubricating groove into the piston pin hole, it is possible to reduce the weight of the product. It is durable enough to withstand high output, making it ideal for internal combustion engines. This has the effect of effectively promoting higher output and higher rotation speed of the engine.

[Brief explanation of drawings]

FIG. 1 is a front view showing the structure of a piston for an internal combustion engine according to the present invention.

FIG. 2 is a side sectional view showing the main parts of the piston for an internal combustion engine according to the present invention.

FIG. 3 is a bottom view showing the main parts of the piston for an internal combustion engine according to the present invention.

FIG. 4 is a sectional view of a main part showing the structure of a conventional piston for an internal combustion engine.

FIG. 5 is a sectional view of a main part showing the structure of a conventional piston for an internal combustion engine.

[Explanation of symbols]

10 Piston body 11 Head part 12 Ring groove 13 Land section 14 Skirt part 15 Piston pin hole 16 Pin boss part 17 Recessed part for meat removal 18 Boss part 19 Oil passage

Claims (1)

[Scope of utility model registration request] Claim 1: The end of the pin boss into which the piston pin is inserted is retracted from the outer periphery of the piston body toward the center of the piston, and a recess for thinning is provided between the pin boss and the land on the outer periphery of the piston. In a lightweight piston for an internal combustion engine, a boss part is provided in a part of the recessed part for thinning, and a boss part that connects a pin boss part and a land part is provided, and the boss part is formed in the land part or in the land part. A piston for an internal combustion engine, characterized in that an oil passage is formed for supplying lubricating oil from the bottom of an oil ring groove into a piston pin hole of a pin boss.