JPH04117208U - engine crank pin metal - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent dirt from getting caught in the oil groove formed by engaging the oil hole provided in the crank pin metal of the engine for supplying lubricating oil to the piston pin. . [Configuration] Hole 1 in upper metal 10 of crank pin metal
2 to form an oil groove 13 only in the direction opposite to the sliding direction S with a cutter having a diameter D1, parallel to the sliding direction S with the crank pin. In addition, by making the chamfer on the sliding surface side of the hole 12 a thread chamfer, a wedge-shaped groove is not formed in the sliding direction between the crank pin and the crank pin metal, thereby preventing dirt from getting caught. do.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a crank pin metal attached to the large end of an engine's connecting rod. Regarding the oil groove provided in the metal on the stone side.

[Conventional technology]

Figure 1 lubricates the small end of the crank pin metal and connecting rod of a V-type engine. FIG. 3 is an explanatory diagram of a lubricating oil circuit. 1 is a cylinder, 2 is a piston, and is connected The small end of the rod 3 and the piston 2 are pivotally connected to each other by a piston pin 4. connecting rod 3 An upper metal 10 and a lower metal 11 of the crank pin metal are attached to the big end 5. It is. A hole 12 is provided in the upper metal 10, and an oil hole 6 is provided in the connecting rod 3. It communicates with the hole of the piston pin 4 at the small end of the connecting rod 3 through the hole. Connecting rod 3 size The end portion 5 and the crank pin 21 of the crankshaft 20 are loosely fitted. crankshaft 20 An oil hole 23 is provided between the crank journal 22 and the crank pin 21. The hole 24 of the crank pin 21 and the hole 12 of the upper metal 10 are in a communicating position. It is set in. Lubricating oil is supplied from the oil pan 25 to the main tank by a hydraulic pump 26. The oil is sent to the crank journal 22 via the engine gallery 27 to lubricate it. After that, Jun The lubricating oil is sent to the crank pin through the oil hole 23 to lubricate it, and also to the crankshaft. Once per rotation, when the hole 24 and the hole 12 communicate with each other, the oil passes through the oil hole 6 of the connecting rod 3. is sent to the piston pin 4 to lubricate it.

0002 Generally, in order to form an oil film on the piston pin 4 in the hole 12 of the upper metal 10, Oil grooves are provided for the purpose of increasing the amount of oil fed. Figure 5 is the conventional upper side 6 is a front view of the metal 10, and FIG. 6 is a plan view seen from the X direction in FIG. 5. Upper side The hole 12 of the barrel 10 is parallel to the sliding direction S with the crank pin 21. An oil groove 14 is provided in both directions by a cutter having a diameter D2. Figure 7 is a cross-sectional view taken along the line L-L in FIG. The ridge lines M and N with respect to the surface are chamfered by about 0.5 mm. Crank 20 turns The hole 24 of the crank pin 21 communicates with the starting end Q of the oil groove 14 of the upper metal 10. Then, lubricating oil starts to be supplied to the piston pin 4, and the hole 24 passes the end R of the oil groove 14. Supply will continue until the end of the period. Therefore, a sufficient amount of oil is applied to the piston pin 4 to form an oil film. Lubricating oil is supplied.

0003

[Problem that the idea aims to solve]

According to the above configuration, the oil groove 14 is located in the hole 12 in the sliding direction of the crank pin 21. Since it is formed in both directions, as shown in FIG. 8, which is a detailed view of section K in FIG. A wedge-shaped cutout is formed in the cut-out portion of the oil groove 14 between the rank pin 21 and the upper metal 10. A gap 15 is formed. Therefore, the garbage G is easily trapped, as shown in F in Figure 6. Seizure due to dirt getting stuck in the part starting from the end R of the oil groove 14, and the oil film running out. Such problems may occur.

0004 The present invention was developed focusing on the above problems, and it does not allow dirt to get caught in it. The engine crank is capable of supplying sufficient lubricating oil to the piston pins. The purpose is to provide cupin metal.

[0005]

[Means to solve the problem]

In order to achieve the above object, the first crank pin metal of the engine according to the present invention is In the invention, the large end of the connecting rod that connects the engine piston and crankshaft a crank mounted on the crank having a hole for supplying lubricating oil to the small end of the connecting rod; In the pin metal, it engages with the hole and is flat in the direction of sliding with the crankshaft. An oil groove provided in the row for increasing the amount of oil fed is connected to the crankshaft from the hole. It is characterized by being provided only in the direction opposite to the sliding direction, and is In this case, the chamfer provided on the ridgeline of the hole on the sliding surface side with the crankshaft, It is characterized by a thread chamfer.

[0006]

[Effect]

According to the above configuration, the oil groove of the crank pin metal is connected from the hole to the crankshaft. It is provided only in the direction opposite to the sliding direction, and the chamfer on the inner surface of the hole is thread chamfered. Therefore, a wedge exists between the crankpin and the crankpin metal in the sliding direction. Therefore, when the crank pin and crank pin metal slide, they may pick up dirt. It never gets absorbed.

[0007]

【Example】

Below, drawings are shown for examples of the engine crank pin metal according to the present invention. Explain with reference to. Figure 2 is a front view of the crank pin metal of the present invention, and Figure 3 3 is a plan view seen from the X direction in FIG. 2. FIG. As is clear from the figure, it engages with hole 12. A cutter with a diameter D1 cuts the oil groove 13 parallel to the sliding direction S. It is processed and molded only in the direction opposite to direction S. Figure 4 is a detailed view of part A in Figure 2. , the outer ridge line B of the hole 12 is chamfered by approximately 0.5 mm, but the inner ridge line C is chamfered. The thread is chamfered to prevent a wedge from forming between it and the crank pin. Piss The supply of lubricating oil to the ton pin is such that the hole 24 of the crank pin 21 is connected to the end P of the oil groove 13 and the hole. 12, a sufficient amount for oil film formation is ensured.

[0008]

[Effect of the idea]

As explained above, the present invention allows the oil groove of the crank pin metal to be inserted into the crank pin metal through the hole. It is provided only in the direction opposite to the direction of sliding with the shaft, and the chamfering of the inner ridgeline of the hole is Because it is chamfered, a wedge-shaped groove is formed between the crankpin and the crankpin metal. It never gets done, so it never picks up dirt. Also, since there is an oil groove, For this reason, the engine's clutch should be able to supply sufficient lubricating oil to the piston pin. You can obtain pin metal.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an engine lubrication system.

FIG. 2 is a front view of the crank pin metal of the present invention.

FIG. 3 is a plan view of the crank pin metal of the present invention.

FIG. 4 is a detailed sectional view of an oil groove.

FIG. 5 is a front view of a conventional crank pin metal.

FIG. 6 is a plan view of a conventional crank pin metal.

FIG. 7 is a detailed sectional view of the hole.

FIG. 8 is a detailed sectional view of an oil groove.

[Explanation of symbols]

10 Upper metal 12 holes 13 Oil groove

Claims (2)

[Scope of utility model registration request] 1. A crank pin metal that is attached to a large end of a connecting rod that connects a piston and a crankshaft of an engine and has a hole for supplying lubricating oil to a small end of the connecting rod. An oil groove for increasing the amount of oil that is engaged with and parallel to the direction of sliding movement with the crankshaft is provided only from the hole in a direction opposite to the direction of movement of the crankshaft. The engine crank pin metal is characterized by: 2. The engine crank pin metal according to claim 1, wherein the chamfer provided on the ridgeline of the hole on the sliding surface side with the crankshaft is a thread chamfer.