JPH0666119A - Lubricating device for internal combustion engine - Google Patents

Abstract

PURPOSE:To supply a lube oil of a low temperature to a crank pin of strict lube oil condition in order to suppress abrasion, and supply lube oil of a comparatively high temperature to a main bearing in order to reduce friction respectively in a passage for supplying lube oil to a crank shaft side. CONSTITUTION:A lubricating device is provided with oil passages 9 for supplying lube oil fed from an oil pump, from the main gallery 8 of a cylinder block to the main bearings 2 of a crank shaft 1. An oil gallery 11 formed continuously from one end to the other end is formed inside the crank shaft 1, and an oil supplying passage 10 for supplying lube oil from the oil pump is provided in the oil gallery 11 independently from the oil passage 9 so as to form oil supplying holes 12 opened on the outer circumferential side of a crank pin 6.

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.

[0002]

2. Description of the Related Art In a device for lubricating each part of an internal combustion engine, various parts are required due to the fact that the parts that require lubrication differ depending on the structure and use conditions of the engine, and the lubrication conditions of each part differ. However, generally, a pressure feed type in which lubricating oil is sucked up from an oil pan by an oil pump, a predetermined pressure is given by an oil pressure regulator and is supplied to a crankshaft side and a camshaft side is widely used.

In such a pressure-feeding type, an oil gallery which is continuous from one end to the other end inside the crankshaft and the oil gallery is opened to the outer periphery of the crank journal and the crank pin, respectively, in order to simplify the lubrication path. It is known that an oil supply hole is formed to guide the lubricating oil from the oil pump to the crankshaft side to the oil gallery, and the main gallery and the crank pin are lubricated from the oil gallery through each oil supply hole. (Kaisho 56-147914).

The crankshaft is formed by integrally surrounding a metal pipe bent in the axial direction as an oil gallery and a small diameter pipe connected to a predetermined position of the metal pipe as an oil supply hole.

[0005]

However, even in this conventional example, since the same lubricating oil supplied from the oil pump to the oil gallery is merely distributed to the main bearing and the crank pin, the oil in the crank pin under severe lubricating conditions is distributed. There is a problem in that it is necessary to supply a low temperature lubricating oil to the oil gallery in consideration of an increase in temperature, which causes an increase in friction in the main bearing.

In order to solve such problems, an object of the present invention is to provide a device capable of separately supplying lubricating oils having different temperatures to the main bearing of the crankshaft and the crankpin.

[0007]

Therefore, the invention of claim 1 is provided with an oil passage for supplying the lubricating oil from the oil pump from the main gallery of the cylinder block to the main bearing of the crankshaft, and inside the crankshaft from one end to the other. A continuous oil gallery is formed at the end, and an oil supply passage for supplying lubricating oil from an oil pump to this oil gallery is provided in a system separate from the oil passage to form an oil supply hole that opens the oil gallery on the outer circumference of the crankpin. .

According to the second aspect of the invention, the oil passage to the main bearing is upstream of the oil cooler via the main gallery of the cylinder block, and the oil supply passage to the oil gallery is not via the main gallery of the cylinder block. Connect to the oil cooler downstream side respectively.

According to the third aspect of the invention, the crankshaft is made by joining the materials of the half-divided plane on the plane passing through the shaft center with the amorphous alloy sheet sandwiched between the joining surfaces of the two and joining them together. .

[0010]

In the invention of claim 1, the lubricating oil from the oil pump is supplied to the main bearing through the oil passage and to the crank pin through the oil supply passage from the oil gallery through the oil supply hole. It will be returned to the oil pan from the oil clearance. Therefore, it becomes possible to supply the lubricating oil having a temperature corresponding to the respective lubricating conditions to the main bearing and the crank pin through the oil passage to the main bearing and the oil supply passage to the oil gallery.

When the oil passage to the main bearing is connected to the upstream side of the oil cooler through the main gallery of the cylinder block as in the second aspect of the invention, the lubricating oil which is not cooled by the oil cooler is further added to the main gallery. And the oil passage to raise the temperature moderately by the heat generated by the engine to the main bearing, and if the oil supply passage to the oil gallery is connected to the oil cooler downstream side without going through the main gallery of the cylinder block, it will be cooled by the oil cooler. The lubricating oil can be supplied to the crank pin from the oil gallery as it is. In other words, relatively high temperature lubricating oil can be supplied to the main bearing, and low temperature lubricating oil can be supplied to the crankpin under severe lubrication conditions, so that the friction of the main bearing and the wear of the crankpin bearing can be effectively reduced. .

As in the third aspect of the present invention, the crankshaft can be easily and easily formed by joining the halved materials with the amorphous alloy sheet.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, 1 is a crankshaft, 2 is a main bearing for supporting a crank journal 3 thereof, each bearing 2 is a bulkhead 4 for partitioning between cylinders, and a bearing cap 5 is fastened to each of these with a bolt. Composed of and. Further, each crankpin 6 is connected to a piston via a connecting rod 7, and rotates about the main bearing 2 as the piston reciprocates.

Reference numeral 8 is a main gallery of a cylinder block (not shown). Lubricating oil flowing therein is distributed to each main bearing 2 through an oil passage 9, and each main bearing 2 is lubricated to oil from an oil clearance. Returned to bread. In order to guide the lubricating oil from the oil supply passage 10 to be described later to each crank pin 6 inside the crankshaft 1, an oil gallery 11 continuous from one end to the other end is formed, and an oil gallery 11 is opened at each outer periphery of the crank pin 6. Refueling hole 1
Two are provided.

A bearing 13 for supplying lubricating oil to the crankpin 6 is formed on the outer periphery of one end of the crankshaft 1. The bearing 13 has an oil gallery 1 inside the shaft 1.
A lead-out hole 14 that opens 1 is provided. An oil supply passage 10 is formed in the bearing 13 so as to connect to the oil pump side without passing through the main gallery 8. An oil seal 15 is provided between the outer periphery of the shaft 1 and an annular gap that constantly communicates the oil supply passage 10 with the introduction hole 14. Intervened.

Therefore, the lubricating oil from the oil supply passage 10 is introduced into the oil gallery 1 through the introduction hole 14 on the outer periphery of the shaft 1.
1 and then through the oil gallery 11 each oil supply hole 12
Is supplied to the crankpin 6 from the sprayer and a part of it is jetted from the spray hole (not shown) of the connecting rod 7 to lubricate the cylinder and the piston to the oil pan together with the oil discharged from the oil clearance. Will be returned.

FIG. 2 is a schematic diagram for explaining a lubricating path to the crankshaft 1 side. Lubricating oil is stored in an oil pan 20 below the cylinder block, and is sucked by an oil pump 21 through an oil strainer (not shown). To be The lubricating oil from the oil pump 21 is the oil filter 2
2 is branched downstream to the main gallery 8 side and the oil supply passage 10 side, and from the main gallery 8 through the oil passage 9 to the main bearing 2
In addition, the oil is supplied from the oil supply passage 10 through the oil cooler 23 to the crank pin 6 from the oil gallery 11.

The crankshaft 1 is shown in FIG.
As described above, the half-divided materials 1A and 1B (which are separately formed by casting on a plane passing through the shaft core of the shaft 1 including the oil gallery 11) sandwich the amorphous alloy sheet 1C after finishing the joining surfaces. Combined with
In that state, the temperature is maintained at a high temperature of about 1200 ° C. (put in a furnace or the like) for a certain time, and after the joining and integration of these, the crank journal 3 and the crank pin 6 are subjected to surface processing and the like.

With such a configuration, the oil pump 20
The lubricating oil from the main gallery 8 is supplied to the main bearing 2 through the oil passage 9 and the oil supply passage 10 to the crank pin 6 through the oil gallery 11.
It will be set back to 1. Therefore, it becomes possible to supply the main bearing 2 and the crank pin 6 with the lubricating oil having the temperatures corresponding to the respective lubricating conditions through the oil passage 9 to the main bearing 2 and the oil supply passage 10 to the oil gallery 11. .

In this example, the oil passage 9 to the main bearing 2 is from the main gallery 8 to the pump 21 side without the oil cooler 23, and the oil supply passage 10 to the oil gallery 11 is not to the main gallery 8 to the oil cooler. Since it is connected to the pump 21 side through 23, the lubricating oil which is not subjected to the cooling action of the oil cooler 23 is further added to the main gallery 8 and the oil passage 9.
The temperature of the main bearing is raised by the heat generated by the engine.
Further, the lubricating oil cooled by the oil cooler 23 can be supplied to the crankpin 6 from the oil gallery 11 almost as it is.

That is, since the lubricating oil having a relatively high temperature (moderate viscosity) can be supplied to the main bearing 2 and the lubricating oil having a low temperature to the crankpin 6 under severe lubrication conditions through different routes, the friction of the main bearing 2 can be reduced. Therefore, the wear of the crank pin 6 can be effectively reduced. In order to prevent the temperature of the lubricating oil on the main gallery 8 side from rising excessively, the lubricating oil may be routed through the oil cooler 23 via the flow path switching valve when necessary such as in the high speed and high load region. good. In this way, when the flow path switching valve is used, the crank pin 6
With this, it becomes possible to supply the lubricating oil at an appropriate temperature to the crank journal 3, and it is possible to reduce friction. Further, when the cooling water is warmer than the lubricating oil immediately after the engine is started, the oil cooler 23 is used as an oil heater,
It is also possible to reduce the friction of the crankshaft system.

[0022]

In summary, according to the invention of claim 1,
An oil passage for supplying lubricating oil from the oil pump from the main gallery of the cylinder block to the main bearings of the crankshaft is provided, and an oil gallery that is continuous from one end to the other is formed inside the crankshaft, and the oil gallery is connected to this oil gallery. An oil supply passage for supplying lubricating oil from the oil passage was provided in a system separate from the oil passage, and an oil supply hole was formed to open the oil gallery on the outer circumference of the crank pin.Therefore, the oil passage to the main bearing and the oil supply passage to the oil gallery were formed. Through this, it is possible to supply the main bearing and the crankpin bearing with lubricating oil at temperatures corresponding to these lubricating conditions.

According to the second aspect of the invention, the oil passage to the main bearing is upstream of the oil cooler via the main gallery of the cylinder block, and the oil supply passage to the oil gallery is not via the main gallery of the cylinder block. If connected to the downstream side of the oil cooler, the temperature of the lubricating oil not cooled by the oil cooler will be raised appropriately by the heat generated by the engine through the main gallery and oil passage, and the lubricating oil cooled by the oil cooler will be applied to the main bearings. It can be directly supplied to the crankpin bearings from the oil gallery. That is, relatively high temperature lubricating oil can be supplied to the main bearing and low temperature lubricating oil can be supplied to the crankpin under severe lubrication conditions, so that the friction of the main bearing and the wear of the crankpin can be effectively reduced.

According to the third aspect of the invention, the crankshaft can be easily and easily manufactured by joining the halved materials with the amorphous alloy sheet.

[Brief description of drawings]

FIG. 1 is a main part configuration diagram showing an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram similarly illustrating a lubrication path to the crankshaft side.

FIG. 3 is a composition explanatory diagram of a crankshaft.

[Explanation of symbols]

 1 crankshaft 2 main bearing 3 crank journal 6 crank pin 8 main gallery 9 oil passage 10 oil supply passage 11 oil gallery 12 oil supply hole 13 oil supply bearing 14 introduction hole 15 oil seal 20 oil pan 21 oil pump 23 oil cooler

Claims (3)

[Claims] 1. An oil passage for supplying lubricating oil from an oil pump from a main gallery of a cylinder block to a main bearing of a crankshaft is provided, and an oil gallery continuous from one end to the other end is formed inside the crankshaft. A lubricating device for an internal combustion engine, wherein an oil supply passage for supplying lubricating oil from an oil pump to the oil gallery is provided in a system different from that of the oil passage, and an oil supply hole is formed to open the oil gallery on the outer circumference of the crank pin. 2. The oil passage to the main bearing is connected to the upstream side of the oil cooler via the main gallery of the cylinder block, and the oil supply passage to the oil gallery is connected to the downstream side of the oil cooler without passing through the main gallery of the cylinder block. The lubricating device for an internal combustion engine according to claim 1, wherein: 3. The internal combustion engine according to claim 1, wherein the crankshaft is made of a material that is formed in half in a plane that passes through the axis, and an amorphous alloy sheet is sandwiched between the joining surfaces of the two materials to join them together. Lubrication equipment for engines.