JPH09287429A - Lubricating device of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrese frictional resistance and cool frictional heat by supplying plenty of lubricating oil between a crank shaft and a main journal at the undersise of the crank shaft when the lubrication becomes hard. SOLUTION: On the underside of a cap 4 and a main journal 8, 9, a relief port 9 is bored so as to communicate with a main journal oil pass 1 through a V-hole 12 which passes along an axially extending cross section within a crank shaft 3 and a cylinder pin 5 when more lubrication is necessary. During the rotation of the crank shaft 3, when the crank shaft 3 is pressed to the lower portion of the main journal 8, lubrication becomes hard. However, in the mean time, when the main journaloil pass 1, V-hole 12, and relief port 9 communicate, the portion to be lubricated may by supplied plenty of lubricating oil, allowing the oil to be supplied by inertia before and after that, thereby frictional resistance being decreased and frictional heat being cooled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention aims to reduce frictional resistance and cool frictional heat by supplying a large amount of lubricating oil between a crankshaft below a crankshaft and a main journal when lubrication conditions become severe. The present invention relates to a lubricating device for an internal combustion engine.

[0002]

2. Description of the Related Art A conventional internal combustion engine lubricating device is shown in FIG.
(A) and (b) show. In the figure, lubricating oil is supplied from an oil pan 51 to a strainer 52 by an oil pump 50.
Is sucked up through and is regulated by the relief 53,
It is sent to the main hall 54. From the main hole 54, an oil passage to each lubricating portion, for example, a valve train oil passage 55 and a main journal oil passage 56 are branched. Lubricating oil to the lubrication portion of the crankshaft 57 is supplied to the main journal oil passage 5
First, it is sent to the main journal 58 from 6, and is sent to the pin journal section through the pin journal oil passage 59 that passes through the inside of the crankshaft 57 and reaches the pin journal section. Then, the lubricating oil is relieved in the oil pan 51 from the clearance between the crankshaft 57 and the main journal 58 and the pin journal. The lubricating oil of the pin journal passes through the relief from the clearance between the pin journal and the crankshaft 57 and the oil jet, and the oil pan 51 after piston lubrication is performed.
There is a relief to.

The conventional lubrication device described in US Pat. No. 3,416,633 attempts to collect the lubricating oil through a relief hole, but the relief passage is set axially outside the bearing. ing. Also, US Pat. No. 2,8
The lubricating device described in the specification of No. 27,342 has an oil supply hole and a relief hole at the same position in the circumferential direction of the bearing. Although it is possible to reduce the pressure drop of the lubricating oil with this, the lubricating oil is collected in the relief hole before the original purpose of the lubricating oil is to reduce the frictional resistance of the lubricating portion and perform the cooling function. I cannot say that it is excellent.

Further, in a conventional lubricating device for an internal combustion engine, a journal is formed in a horizontally long egg shape. Then, the crankshaft 57 and the journal have large clearances on both sides, which is referred to as an oil clearance to perform relief to the oil pan. In such an internal combustion engine, the behavior of the lubricating oil supply in the main journal oil passage 56 and the behavior of the crankshaft 57 in the main journal 58 (axial center locus) were investigated (see FIG. 8). As a result, it becomes clear that the supply of lubricating oil to the main journal 58 is increased when the V hole 63 provided in the crankshaft 57 is communicated with the main journal oil passage 56, as shown in FIG. 7. It was Furthermore, it was also found that the lubricating oil supply continued due to the inertia of the lubricating oil even after the communication time.
Further, the crankshaft 57 largely fluctuates in the sliding direction of the piston (see FIG. 8). Particularly, as shown in FIG. 7, the lubricating condition is that the crankshaft rotation angle is 90 ° C.
It begins to become severe from A and becomes the severest around 180 ° CA. That is, it has been found that the fluctuation of the piston in the direction of the bottom dead center to which the explosive force and the inertial force of the piston are simultaneously applied becomes large, and the lubrication condition becomes the severest. The lubricating oil not only lubricates the sliding portion but also has a cooling and cleaning function. Therefore, when the friction condition is severe, the lubricating oil is generally used.
It is desirable that a large amount be supplied when is in the direction of the bottom dead center of the piston.

[0005]

In the conventional lubricating apparatus for an internal combustion engine, in the worst case, the lubricating oil is not sufficiently supplied to the main journal at the bottom dead center position where the lubricating conditions become severe. There is a problem that seizure of the moving surface is likely to occur. Further, since the clearance of the journal portion is small, the pressure loss becomes high, and the supply of lubricating oil is small, and at the same time, a high output oil pump is required.

The present invention was created in view of the above problems, and an object thereof is to provide a lubricating device having a V hole in a crankshaft of a main journal of an internal combustion engine, in which the crankshaft is When it is pressed below the main journal and the lubrication conditions become severe,
It is an object of the present invention to provide a lubricating device for an internal combustion engine, which is designed to reduce frictional resistance and cool frictional heat by supplying a large amount of lubricating oil between a crankshaft below a crankshaft and a main journal.

[0007]

[Means for Solving the Problems] In order to solve the above problems, the means described in claim 1 can be adopted. According to this means, when the crankshaft rotates clockwise and the crankshaft is pressed below the main journal and the lubrication conditions become severe, a large amount of lubricating oil is supplied through the relief hole between the crankshaft and the main journal. Before and after that time, more lubricating oil is supplied by inertial force than the conventional lubrication system, so the area of increased lubricating oil can be expanded, reducing the frictional resistance between the crankshaft and the main journal, and reducing frictional heat. The cooling of can be accelerated.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing a main part of a lubricating device for an internal combustion engine according to the present invention, FIG. 1 (a) is a sectional view when the piston is in the vicinity of bottom dead center, and FIG. It is sectional drawing when it exists in the top dead center vicinity. In the figure, a crankshaft 3 is rotatably mounted through a main journal 10 in a semicircular hole of an engine block 2 having a main journal oil passage 1 and a semicircular hole of a cap 4 provided at a lower portion of the engine block 2. It is fitted. A cylinder pin 5 that rotates about the center of the crankshaft 3 is connected to the crankshaft 3. The base portion of the connecting rod 6 is composed of a pin journal 7 bearing the cylinder pin 5. Therefore, the rotational movement of the crankshaft 3 is converted into the linear reciprocating movement of the connecting rod 6 via the cylinder pin 5.
In the lower part of the cap 4 and the main journal 8 which face the upper part of the oil pan arranged on the lower side of the lubrication device, a V hole 1 penetrating the axial section of the crankshaft 3 and the cylinder pin 5 is formed.
A relief hole 9 communicating with the main journal oil passage 1 via 2 is formed. In this embodiment, a lubricating oil supply oil passage is formed so that the main journal oil passage 1, the V hole 12, and the relief hole 9 communicate with each other in a substantially straight line. When the main journal oil passage 1, the V hole 12, and the relief hole 9 communicate with each other, a large amount of lubricating oil is supplied from the relief hole 9 between the crankshaft 3 and the main journal 8. A main hole (not shown) is formed above the main journal oil passage 1. An oil jet oil hole 10 is formed near the left side of the connecting rod 6 of the pin journal 7. When the main journal oil passage 1, the V hole 12 and the oil jet oil hole 10 communicate with each other, the oil jet oil hole 10 Lubricating oil is supplied to lubricate the piston.

Next, the operation of this embodiment will be described with reference to FIGS. First, the rotation of the crankshaft 3 causes the cylinder pin 5 to rotate in the clockwise direction from the vicinity of the top dead center (FTDC) of the first cylinder, and the crank angle becomes close to 180 ° CA. Before the relief hole 9 communicates, the supply of the lubricating oil begins to increase due to the inertia of the lubricating oil. When the main journal oil passage 1, the V hole 12, and the relief hole communicate with each other, the pressure loss of the oil supply passage is significantly reduced, so that a large amount of lubricating oil is supplied to the lubrication portion during the communication time (see FIG. 2). It is possible to reduce the frictional resistance of the lubrication portion and accelerate the cooling of frictional heat. Cylinder pin 5
Is further rotated, and the communication between the relief hole 9 and the V hole 12 is blocked. Even if this happens, the remaining amount of lubricating oil is supplied by inertial force, as shown in FIG.

According to the present invention, in the vicinity of the crank angle of 180 ° CA and 540 ° CA, which is the bottom dead center of the piston, that is, when the crankshaft 3 is pressed downwardly against the main journal 8, the main journal becomes harsh. Since the oil passage 1, the V hole and the relief hole 9 communicate with each other,
Since a large amount of lubricating oil is supplied between the crankshaft 3 below the crankshaft 3 and the main journal 8, and more and more lubricating oil is supplied by inertial force before and after the communication time as compared with a conventional lubricating device, The amount increasing region can be expanded, and the frictional resistance of the lubrication part can be reduced and the frictional heat can be cooled.

FIG. 3 shows a second embodiment of the present invention. First
In the embodiment, the crankshaft 3 and the cylinder pin 5
Although the axial cross section inside is penetrated by the V hole 12, in the present embodiment, the axial cross section inside the crankshaft 3 and the cylinder pin 5 is penetrated by the H hole 15. And
When the crank angle is 120 ° CA and 300 ° CA, that is, when the lubrication condition becomes severe, the relief hole 9 is connected to the main journal 8 so that the main journal oil passage 1, the H hole 15 and the relief hole 9 communicate with each other. It is provided so as to penetrate the cap 4 and open to the upper part of the oil pan. Therefore, in this embodiment, the crankshaft 3 is
During the rotation, the relief hole 9 becomes the main journal oil passage 1
As shown in FIG. 4, a large amount of lubricating oil is supplied between the crankshaft 3 and the main journal 8 when the lubricating conditions are becoming severe as shown in FIG.
Moreover, before and after the communication time, the amount of oil supplied is even greater than that of the conventional lubrication device due to the inertial force, so the oil amount increase area can be expanded without interruption, reducing the frictional resistance of the lubrication part and cooling the friction heat. It can be effectively promoted.

FIG. 5 shows a third embodiment of the present invention. First
In the embodiment, the main journal oil passage 1 and the V hole 1
Although the 2 and the relief hole 9 communicate with each other on a substantially straight line, they do not necessarily need to communicate with each other on a straight line, and each passage may be connected while being bent as in the present embodiment. FIG.
FIG. 5A is a cross-sectional view of an embodiment in which the direction of the relief hole 9 is changed in order to facilitate the processing of the relief hole 9 in the cap 4, and FIG. It is sectional drawing of embodiment which changed the position of the oil hole 12 of the crankshaft 3 in order to increase a lubricating oil supply.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a main part of a first embodiment of a lubricating device for an internal combustion engine of the present invention, and FIG. 1 (a) is a cross-sectional view when a piston is near a bottom dead center. (B) is a sectional view when the piston is near the top dead center.

FIG. 2 is an oil quantity waveform of the lubricating device of the first embodiment.

FIG. 3 is a sectional view showing a main part of a second embodiment of the present invention, FIG. 3 (a) is a sectional view when a crank angle is 0 ° CA, and FIG. 3 (b) is a crank angle of 120 °. Sectional view at CA, FIG. 3C is a sectional view at a crank angle of 180 ° CA, and FIG. 3D is at a crank angle of 300 ° CA.
It is sectional drawing at the time of.

FIG. 4 is an oil quantity waveform of the lubricating device of the second embodiment.

FIG. 5 is a cross-sectional view showing a main part of a third embodiment of the present invention, and FIG. 5 (a) is an embodiment in which the direction of the relief hole is changed to facilitate machining of the relief hole in the cap. 5B is a cross-sectional view of an embodiment in which the position of the oil hole of the crankshaft is changed in order to increase the lubricating oil supply immediately before the lubrication condition becomes severe.

6 is an explanatory view showing a conventional lubricating device for an internal combustion engine, and FIG. 6 (a) is a perspective view of the lubricating device.
(B) is a sectional view showing a main part of the lubricating device.

FIG. 7 is an oil quantity waveform of a conventional lubricating device.

FIG. 8 is an explanatory diagram showing a crankshaft behavior in a main journal portion of a conventional lubricating device.

[Explanation of symbols]

 1 ... Main journal oil passage 2 ... Engine block 3 ... Crank shaft 4 ... Cap 5 ... (# 1) Cylinder pin 6 ... Connecting rod 7 ... Pin journal 8 ... Main journal 9 ... Relief hole 10 ... Oil jet oil hole 12 ... Oil hole 13 ... Main hall 15 ... H hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toru Yoshinaga 14 Iwatani, Shimohakaku-cho, Nishio-shi, Aichi Stock Company Japan Auto Parts Research Institute (72) Inventor Tokio Obama 14 Iwatani, Shimohakaku-cho, Nishio-shi, Aichi Shares Within Japan Auto Parts Research Institute

Claims (5)

[Claims] 1. In a lubricating device for an internal combustion engine, a relief hole penetrating a main journal for bearing a crankshaft and a cap installed at a lower part of an engine block and opening at an upper part of an oil pan installed at a lower side of the internal combustion engine. A lubricating device for an internal combustion engine, characterized in that it is provided at a position where lubrication conditions are severe. 2. The relief hole communicates with a main journal oil passage formed in the engine block and an oil hole formed in the crankshaft, and the main journal oil passage, the oil hole, and the relief hole are used to supply lubricating oil. The lubricating device for an internal combustion engine according to claim 1, wherein the lubricating device is provided at a position where a passage is formed. 3. The lubricating device for an internal combustion engine according to claim 2, wherein the main journal oil passage, the oil hole and the relief hole communicate with each other in a substantially straight line. 4. The H-hole penetrates the crankshaft and the axial section in the cylinder pin, and the main journal oil passage and the relief hole are communicated twice through the H-hole for one rotation of the crankshaft. The lubricating device for an internal combustion engine according to claim 2, wherein 5. The lubricating device for an internal combustion engine according to claim 2, wherein the main journal oil passage, the oil hole in the crankshaft, and the relief hole are bent to communicate with each other.