KR20020043342A - Lubrication structure of single cylinder internal combustion engine - Google Patents

Abstract

PURPOSE: Structure for lubricating an inner combustion engine with a single cylinder is provided to reduce frictional resistance generated in reciprocating moment of a piston and to discharge lubricating oil through a crank chamber. CONSTITUTION: Structure for lubricating an inner combustion engine by a single cylinder comprises first and second oil passages(111,112) mounted on a crank journal(110); a crank pin supporting a small diameter unit(220) of a connecting rod(200); first and second supplying passages(121,122) formed on an outer circumference of the crank pin; a crank shaft(100) having second connecting passage(114); an injecting hole(320) interlocking with the first oil passage by being mounted on a crank case(300); a drain port(340) interlocking with the second oil passage by being installed on the crank case; first and second guiding passages(210,212) formed on the connecting rod by being interlocked with the piston pin; first and second pin passages formed on an outer circumference of a piston pin(400); and a guide(520) rotating the connecting rod by being mounted between a cylinder and the crank case.

Description

Lubrication Structure of Single Cylinder Internal Combustion Engine {.}

The present invention relates to a lubrication structure of a short-cylinder internal combustion engine that supplies lubricating oil to reduce frictional resistance to frictional portions generated by reciprocating motion of a piston, and in particular, the lubricating oil supplied to the frictional portion flows without leakage. It relates to a lubrication structure of a short-cylinder internal combustion engine to collect oil falling by piston friction in a separate path.

In general, an internal combustion engine converts thermal energy generated by a reciprocating motion of a piston into kinetic energy to perform mechanical work.

This internal combustion engine supplies lubricating oil to the friction part acting as a resistance element for the efficiency of the force obtained in the expansion stroke of the cylinder.

In other words, the cylinder, the piston, the crankshaft, the connecting rod, etc. form a friction surface in the cycle of generating power as the piston moves up and down, and the friction surface includes gamma, cooling, sealing, buffering, antirust, and creation. Lubricant is supplied for

However, in the conventional internal combustion engine, lubricating oil supplied to each friction part such as lubrication between the cylinder and the piston and lubrication between the crankshaft is leaked and collected separately in the crankcase. This is difficult to obtain the supercharge effect using the pressure difference of the crankcase or there was a problem of lowering the combustion performance.

The short-term cylinder internal combustion engine of the patent application application No. 1-1-00-5354162-66 filed by the applicant uses the pressure difference of the crankcase, and in particular, the lubrication structure of the conventional internal combustion engine is applied. There was a problem with this.

The present invention has been made in order to solve the above problems, an object of the present invention is to discharge the flow path of the lubricating oil supplied through the outside of the crank chamber in order to reduce the frictional resistance to the friction parts generated by the reciprocating motion of the piston It is to provide a lubrication structure of the short-cylinder internal combustion engine to have a flow path structure that is resupply and then the oil leakage in the cylinder has a separate path to be drained.

The present invention for realizing the above object is to provide a flow path structure that is supplied again after the return path of the lubricating oil is supplied through the outside of the crank chamber in order to reduce the resistance to frictional portions generated by the movement of the piston The present invention relates to a lubrication structure of a single-cylinder internal combustion engine which has a separate path and has oil leakage therein, and the present invention forms a first flow path and a second flow path around both sides of a crank journal at regular intervals. A first supply path and a second supply path which surround the outer circumferential surface of the crank pin supporting the small diameter part at a predetermined interval, and communicate the first flow path and the first supply path; A crankshaft having a second connection to communicate the supply path; A crankcase having an inlet communicating with the first channel of the crankshaft and an outlet communicating with the second channel; And a connecting rod having a first guide path and a second guide path for communicating the first and second supply paths of the crankshaft with the piston pins, the first guide paths and the second guides on both sides of the outer peripheral surface of the piston pin. The first pin flow path and the second pin flow path which are in communication with the guide path and one side is cut to the cylinder side are formed, and a circulation groove facing the first pin flow path and the second pin flow path is formed on the outer circumferential surface of the piston pin. Between the cylinder and the crankcase, a blocking plate equipped with a guide for guiding the rotational movement of the connecting rod is inserted, and a collecting groove is formed at the bottom of the blocking plate, and the collecting groove is connected to the collecting pipe installed outside the cylinder. It is a characteristic structure to communicate with a groove.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a sectional view of principal parts of a short-term barrel internal combustion engine to which the lubricating structure of the present invention is applied.

Figure 2 is a plan sectional view of a cylinder showing the piston lubrication path of the present invention.

3 is a front view of main parts of the piston pin;

Explanation of symbols on the main parts of the drawings

100: crankshaft 110: crank journal 111: first euro

112: second euro 113: first connection 114: second connection

12: crank pin 121: first supply path 122: second supply path

200: connecting rod 210; First Route 212: Second Route

300: crankcase 320: inlet 340: outlet

400: piston pin 420; First Pin Euro 440: Second Pin Euro

510; Collection groove 512; Exhaust Groove 720: Circulation Groove

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3.

In the drawings, the present invention forms a first flow path 111 and a second flow path 112 around both sides of the crank journal 110 at regular intervals, and supports the small diameter portion 220 of the connecting rod 200. A first supply passage 121 and a second supply passage 122 formed around the outer circumferential surface of the fin 120 at a predetermined interval, and the first passage 111 and the first supply passage 121 communicate with each other. A crankshaft (100) having a first connection passage (113) and a second connection passage (114) for communicating the second passage (112) and the second supply passage (122); A crankcase 300 having an inlet 320 communicating with the first flow path 111 of the crankshaft 100 and an outlet 340 communicating with the second flow path 112; Connecting rod having a first guide passage 210 and a second guide passage 212 communicating the first supply passage 121 and the second supply passage 122 and the piston pin 400 of the crankshaft 100. Equipped with 200.

In addition, the first pin passage 420 and the second side which are in communication with the first guide passage 210 and the second guide passage 212 on both sides on the outer circumferential surface of the piston pin 400 and one side is cut toward the cylinder 450 side. A fin flow path 440 is formed and a circulating groove 720 facing the first fin flow path 420 and the second fin flow path 440 is formed on the outer circumferential surface of the piston 700.

In addition, between the cylinder 450 and the crankcase 300, a blocking plate 500 equipped with a guide 520 for guiding the rotational movement of the connecting rod 200 is fitted to the upper surface of the blocking plate 500. The collection groove 510 is formed and the collection groove 510 communicates with the distribution groove 512 connected to the collection pipe 600 installed outside the cylinder 450.

The front end of the first pin passage 420 and the second pin passage 440 of the piston pin 400 has a wide expansion surface 433 with respect to the diameter of the circulation groove 720 so that accurate communication with the circulation groove 720 is made. ) Is formed.

The piston 700 is in close contact with the first pin passage 420 and the second pin passage 440 inside the piston hole 740 into which the piston 700 is inserted, so that the sealing member 800 maintains airtightness. The inlet hole 920 is formed so that the circulation groove 720 is successively formed on the outside of the cover 900 which is inserted into the piston hole 740 to prevent the separation of the piston pin 400 and the separation of the piston pin 400. Is formed.

In addition, a key groove 242 into which the key 246 supporting the first pin passage 420 of the piston pin 400 is inserted is formed inside the large diameter portion 240 of the connecting rod 200.

Therefore, the lubricating oil injected through the inlet 320 of the crankcase 300 rides through the first guide passage 210 through the first passage 111, the first connection passage 113, and the first supply passage 121. The pressure is increased to guide the first pin flow path 420 of the piston pin 400.

In this process, one side of the crankshaft 100 and the piston pin 400 is lubricated.

Thereafter, the lubricating oil guided to the first pin flow path 420 is lubricated between the cylinder 450 and the piston 700 along the circulation groove 720 of the piston 700 and then flows into the second pin flow path 440 to be connected. Take the second guide path 212 of the rod 200 through the second supply passage 122, the second connection passage 114, the second passage 112 through the outlet 340 of the crankcase 300 After passing through the exhaust flow path is exhausted through the re-filtration means is supplied to the inlet 320 recirculated.

Meanwhile, the lubricating oil leaked between the cylinder 450 and the piston 700 is dropped into the collecting groove 510 of the blocking plate 500 and is collected into the collecting pipe 600 through the draining groove 512.

At this time, the collecting pipe 600 is connected to the manifold and the air exhausted with the lubricating oil.

The present invention has a flow path structure that is supplied after the return path of the lubricating oil is discharged through the outside of the crank chamber in order to reduce the frictional resistance to the frictional portions generated by the reciprocating motion of the piston and the oil leakage in the cylinder By being drained with a separate path, the mixing of the lubricating oil is prevented in the charging process of the outside air through the crank chamber, thereby improving the charging effect, that is, the output.

Claims (2)

The first and second flow paths 111 and 112 are formed around both sides of the crank journal 110 at regular intervals, and the outer circumferential surface of the crank pin 120 supporting the small diameter portion 220 is spaced at a predetermined interval. A first connection passage 113 and a second passage forming a first supply passage 121 and a second supply passage 122 and communicating the first passage 111 and the first supply passage 121. A crankshaft 100 having a second connection path 114 for communicating 112 with the second supply path 122; A crankcase 300 having an inlet 320 communicating with the first flow path 111 of the crankshaft 100 and an outlet 340 communicating with the second flow path 112; Connecting rod having a first guide passage 210 and a second guide passage 212 communicating the first supply passage 121 and the second supply passage 122 and the piston pin 400 of the crankshaft 100. I have 200 The first pin flow path 420 and the second pin which is in communication with the first guide path 210 and the second guide path 212 on both sides on the outer circumferential surface of the piston pin 400 and one side is cut to the cylinder 450 side A flow path 440 is formed and a circulation groove 720 facing the first fin flow path 420 and the second fin flow path 440 is formed on the outer circumferential surface of the piston 700. Between the cylinder 450 and the crankcase 300, a blocking plate 500 equipped with a guide port 520 for guiding the rotational movement of the connecting rod 200 is inserted into the upper surface of the blocking plate 500. The groove 510 is formed and the collecting groove 510 is a lubrication structure of a short-term cylinder internal combustion engine, characterized in that the communication with the drainage groove 512 connected to the collecting pipe 600 installed outside the cylinder 450. The method of claim 1, The front end of the first pin passage 420 and the second pin passage 440 of the piston pin 400 has a wide expansion surface 433 with respect to the diameter of the circulation groove 720 so as to make accurate communication with the circulation groove 720. This formed configuration is characterized in that the lubrication structure of the single-cylinder internal combustion engine.