JPH09280027A - Lubrication device of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve lubrication and cooling functions by supplying lubricating oil without intermittence as much as possible and reduce the work of a pump by supplying oil further with low pressure loss. SOLUTION: A plurality of oil holes 8, 9, 10, 11 are drilled in a pin journal 7 of a conrod 6. When the communication of an oil jet oil hole 8, a V hole 12, and a main journal oil passage 1 is set shut off by the rotation of a cylinder pin 5, residual amount of lubricating oil at the time other than the communication time is supplied due to inertia force. The cylinder pin 5 is further rotated to communicate a relief hole 9 with the V hole 12. While the supply of residual amount of lubricating oil is not stopped, lubricating oil is supplied through the relief hole 9. By repeating these actions to supply lubricating oil without intermittence as much as possible, lubrication and cooling functions are improved, and furthermore, the work of a pump can be reduced by supplying oil with low pressure loss.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating device for an internal combustion engine which can reduce the work of an oil pump.

[0002]

2. Description of the Related Art FIG. 8 shows a conventional lubricating device for an internal combustion engine.
(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.
After being blown up, the pressure is adjusted 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.

Lubricating oil is supplied to the piston by connecting rod 6
As shown in FIG. 9, the apparatus that uses the 0 oil jet oil hole 61 is mainly the one oil jet oil hole 61.
When the oil amount waveform of the pin journal oil passage 59 in the crankshaft 57 of this internal combustion engine is measured at the oil amount measuring position 62, the lubricating oil is supplied to the pin journal by the pin journal oil passage 59 and the oil jet oil hole 61. V hole 63
It has a pulsating waveform that increases when communicating with each other. Moreover, it was found that the pulsating waveform is not a pulse-shaped waveform that increases only the communication time, but a mountain-shaped waveform in which inertial force remains before and after the communication time, as shown in FIG.

[0004]

In any case, in the intermittent lubrication oil supply such as the conventional lubrication system for an internal combustion engine, lubrication and cooling are not performed smoothly, and the work of the pump is large. There is a problem that

The present invention has been made in view of the above problems, and an object of the present invention is to utilize the fact that the oil quantity waveform is a pulsating wave having inertial force, and to make the lubricating oil as continuous as possible. Is provided to improve lubrication and cooling, and to provide low-pressure loss oil supply to provide a lubricating device for an internal combustion engine that reduces pump work.

[0006]

[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 one oil hole formed in the pin journal is cut off from the V hole provided in the crankshaft in accordance with the rotation of the cylinder pin, the lubricating oil is not in the communication time from the one oil hole. The remaining amount of is supplied by inertial force. Then, when the cylinder pin further rotates, another oil hole communicates with the V hole this time. Then, the lubricating oil is supplied from another oil hole before the remaining amount of the lubricating oil is supplied from the previous oil hole. By repeating such actions with the rotation of the cylinder pin,
The average amount of oil supplied from the oil holes increases. in this way,
By increasing the amount of oil to the pin journal as intermittently as possible, it is possible to reduce the pressure drop of the lubricating oil supply to the main journal, and by increasing the lubricating oil supply to the main journal, improving the lubrication and cooling of the main journal. Can be planned. As described above, the lubricating device of the present invention has a low pressure loss, and thus the work of the oil pump can be reduced.

[0007]

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 cross-sectional view showing a main part of a lubricating device for an internal combustion engine of the present invention, FIG. 1 (a) is a cross-sectional view when the piston is in the vicinity of top dead center, and FIG. It is sectional drawing when it exists in the bottom dead center vicinity. In the figure, a crankshaft 3 is rotatably fitted in a circular hole of a main journal 2 having a main journal oil passage 1. A cylinder pin 5 that rotates about the center of the crankshaft 3 is connected to the crankshaft 3. The base of the connecting rod 6 is the cylinder pin 5 described above.
It is composed of a pin journal 7 for bearing. 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. At least two oil holes are formed in the pin journal 7 of the connecting rod 6 at substantially equal intervals. In the present embodiment, four oil holes 8, 9, 10, 11 are provided at substantially equal intervals. Has been done. The main journal oil passage 1 and the pin journal 7 are attached to the crankshaft 3 and the cylinder pin 5.
V holes 12 for communicating with the oil holes 8, 9, 10 and 11 are formed. Of the oil holes, the oil hole 8 near the connecting rod 6,
9 has both an oil jet function for lubricating the piston and a relief function for relieving the oil in the oil pan, and the oil holes 10 and 11 on the opposite side serve as relief holes for directly relieving the oil in the oil pan. It has a function.

Next, the operation of this embodiment will be described with reference to FIGS. 1 and 2. In the present embodiment, the oil hole 8 of the first cylinder (# 1) is the oil jet oil hole 8, and the remaining oil holes 9, 10, 11 are respectively relief holes 9, 10, 11 respectively.
It will be described as. First, when the piston is near the top dead center (FTDC) of the first cylinder, the oil jet oil hole 8
Is communicated with the main journal oil passage 1 via the V hole 12, and the remaining amount of the lubricating oil other than the communication time that is injected is supplied by inertial force. Next, crankshaft 3
When the cylinder pin 5 rotates in the clockwise direction due to the rotation, the oil jet hole 8 is blocked from communicating with the V hole 12, and this time the relief hole 9 communicates with the main journal oil passage 1 through the V hole 12. The relief hole 9 is supplied before the remaining amount of lubricating oil is supplied from the oil jet oil hole 8.
Lubricating oil is supplied from. Further, when the cylinder pin 5 rotates clockwise due to the rotation of the crankshaft 3, the relief hole 9 is disconnected from the V hole 12, and this time the relief hole 10 communicates with the main journal oil passage 1 through the V hole 12. To do. Then, the lubricating oil is supplied from the relief hole 10 before the remaining amount of the lubricating oil from the relief hole 9 is continuously supplied. When the crankshaft 3 further rotates and the cylinder pin 5 rotates clockwise, the relief hole 10 is disconnected from the V hole 12, and this time the relief hole 11 communicates with the main journal oil passage 1 through the V hole 12. To do. Then, the lubricating oil from the relief hole 11 is supplied before the remaining amount of the lubricating oil from the relief hole 10 is continuously supplied. When the crankshaft 3 further rotates and the cylinder pin 5 rotates clockwise, the relief hole 11 is disconnected from the V hole 12,
This time, the oil jet oil hole 8 communicates with the main journal oil passage 1 through the V hole 12. And the relief hole 11
The lubricating oil is supplied from the oil jet oil hole 8 and the piston is lubricated before the remaining amount of the lubricating oil is continuously supplied. Hereinafter, the above-described operation is repeated while the internal combustion engine is operating.

As described above, as shown in FIG. 2, increasing the amount of oil to the pin journal 7 as intermittently as possible makes it possible to reduce the low pressure loss of the lubricating oil supply to the main journal 2 and By increasing the supply of lubricating oil to the main journal 2, lubrication and cooling of the main journal 2 can be improved. Thus, the low pressure loss of the lubricating device can reduce the work of the oil pump.

FIG. 3 shows a second embodiment of the present invention. The piston temperature becomes highest due to combustion near the top dead center, and the oil film tends to run out near the top dead center due to swinging, etc., so the supply of lubricating oil is increased around the top dead center to cool and maintain the oil film. There is a need. Therefore, in the present embodiment, as shown in FIG. 3, an oil jet oil hole 8 and a relief hole 9 are formed in a pin journal 7 which is substantially symmetrical with respect to the connecting rod 6 to increase the supply of lubricating oil immediately after top dead center. I am trying. 3A is a cross-sectional view of the oil jet oil hole 8 communicating with the main journal oil passage through the V hole 12, and FIG. 3B is a cross-sectional view of the relief hole 9 through the V hole 12 and the main journal. FIG. 4 is a cross-sectional view in a state of communicating with the oil passage 1, and FIG. 4 is an oil amount waveform of the lubricating device of the present embodiment. In the figure, 13 is a main hole and 14 is an engine block cross section.

Generally, as shown in FIG. 5, the oil amount increases in both the main oil passage and the pin oil passage as the engine speed increases, but the increase in the pin oil amount is small. This is because the pin oil passage outlet, that is, the pin journal 7 due to an increase in centrifugal force during high-speed rotation.
It is considered that the pressure loss at the outlet of the oil hole becomes large and the lubricating oil does not flow easily. Generally, since the pin journal 7 is more lubricated than the main journal 2, it is necessary to increase the pin lubrication. FIG. 6 shows a third embodiment of the present invention.
In the third embodiment, the lubricating device in the second embodiment is opened below the pin journal 7 of the lubricating device in the upper surface of the oil pan.
Further, it corresponds to one in which at least one relief hole 15 is formed. In this embodiment, by connecting the main journal oil passage 1, the V hole 12, and the relief hole 15 to each other,
It is possible to supply a large amount of lubricating oil and improve cooling performance. Further, when the main journal oil passage 1, the V hole 12, and the relief hole 15 communicate with each other, a low pressure loss occurs and the lubricating oil flows rapidly, and a large amount of lubricating oil is supplied by inertia after the communication. In this case, the supply of lubricating oil can be increased, and the work of the oil pump can be reduced. FIG. 7 is an oil quantity waveform of the lubricating device of this embodiment.

[Brief description of drawings]

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, FIG. 1 (a) is a cross-sectional view when a piston is near top dead center, and FIG. (B) is a sectional view when the piston is near the bottom 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, and FIG. 3 (a) is a sectional view showing a state in which an oil jet oil hole communicates with a main journal oil passage via a V hole. 3 (b) is a cross-sectional view showing a state in which the relief hole communicates with the main journal oil passage via the V hole.

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

FIG. 5 is a characteristic diagram showing the relationship between engine speed, oil amount, and time.

FIG. 6 is a sectional view showing a main part of a third embodiment of the present invention.

FIG. 7 is an oil quantity waveform of the lubricating device of the third embodiment.

8 is an explanatory view showing a conventional lubricating device for an internal combustion engine, FIG. 8 (a) is a perspective view of the lubricating device, and FIG.
FIG. 3 is a cross-sectional view showing a main part of a lubricating device.

FIG. 9 is an oil quantity waveform of a conventional lubricating device.

[Explanation of symbols]

 1 ... Main journal oil passage 2 ... Main journal 3 ... Crank shaft 5 ... (# 1) Cylinder pin 6 ... Connecting rod 7 ... Pin journal 8, 9, 10, 11 ... Oil hole 12 ... V hole 15 ... Relief 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 (3)

[Claims] 1. In a lubricating device for an internal combustion engine, at least two or more oil holes communicating with V holes provided in a crankshaft and a cylinder pin are formed in a pin journal at the base of a connecting rod for bearing a cylinder pin. A lubricating device for an internal combustion engine, characterized in that 2. The lubricating device for an internal combustion engine according to claim 1, wherein at least one oil hole is further provided below the pin journal so as to open on the upper surface of the oil pan. 3. The lubrication device for an internal combustion engine according to claim 1, wherein the oil holes are formed at positions substantially symmetrical with respect to the connecting rod of the pin journal.