JPS6024887Y2 - Internal combustion engine lubrication system - Google Patents

Description

[Detailed description of the invention] This invention is designed to facilitate the machining of oil holes in internal combustion engines in which lubricating oil flows from the crank journal of the crankshaft to the crank pin side. Separates contaminants in oil,
The present invention relates to a lubricating device for an internal combustion engine that is capable of storing data to improve its life.

An internal combustion engine obtains rotational force by transmitting the reciprocating motion of a piston within a cylinder to a crankshaft via a connecting rod.

For this reason, the joint between the piston and the small end of the connecting rod and the joint between the crankshaft and the big end of the connecting rod must be sufficiently lubricated.

As a lubricating device for this purpose, an oil hole is provided in the crank journal of the crankshaft, and the oil from the oil pump is pumped here, and an oil hole is provided in the crank pin that leads to the oil hole in the connecting rod.
Generally, this oil hole communicates with the oil hole of the crank journal.

Conventionally, in order to communicate the oil hole provided in the crank journal with the oil hole provided in the crank pin,
A crank pin with an oil hole drilled diagonally toward the crank journal, or a crank pin with two oil holes drilled in the axial direction of the crankshaft, one in the crank journal and the other in a direction perpendicular to this. There were some that were designed to communicate through the oil hole.

In the former case, the crank pin should have two oil holes: one diagonally on the crank pin, and one extending from this oil hole to the big end of the connecting rod. Machining the oil hole is difficult, and the hole diameter cannot be increased due to problems with the strength of the crank pin.
There was a problem that the weight of the crank pin increased.

In the latter type, compared to the former type, the crank pin can be drilled axially or perpendicularly, making machining easier, and since the axial oil hole is provided at the center of the shaft, it can be made larger in diameter. Although it can be made lightweight without any problems in terms of strength, there are three oil holes in total: one in the axial direction of the crank pin, one towards the connecting rod that communicates with this, and one towards the crank journal, which increases the number of man-hours required for machining. Moreover, it becomes necessary to close the end of the oil hole in the axial direction with a plug.

This idea improves these conventional ones to improve processability and
In addition to improving strength and weight, it is also capable of separating and accumulating contaminants in oil.

Next, one embodiment of this invention will be explained with reference to the diagram.
In the figure, reference numeral 1 denotes a crankshaft, which is rotatably supported by a crankcase (not shown) by a bearing 2 and a left bearing (not shown).

3 is the crank journal, 4 is the crank wheel (balance weight), 5 is the crank pin, and 6 is the big end of the connecting rod.

The connecting rod has an oil hole that guides oil from the big end 6 to a small end (not shown), but this part is not shown.

The crank journal 3 is provided with an oil hole 7 along the central axis of the crankshaft 1, and an oil hole 9 for communicating the oil hole 7 with an oil reservoir 8, which will be described later.

This oil hole 9 is provided in the radial direction of the crankshaft 1.

The opening of the oil hole (right end in FIG. 1) communicates with an oil pump (not shown) and receives oil under pressure from the oil pump.

A crank balancer drive gear 10 is attached to the crankshaft 1 by press fitting between the bearing 2 and the crank wheel 4.

The left side surface of the crank balancer drive gear 10 in FIG. 1 is tightly joined to the crank wheel 4.

The crank pin 5 is slightly shorter than the normal one, and the crank balancer drive gear 10 of the crank pin 5 is
A gap t is provided between the side end face 15 and the crank balancer drive gear 10, and this portion is shaped like the oil reservoir 8 described above.

The crank pin 5 is provided with an oil hole 11 along the central axis of the crank pin 5, with the oil reservoir 8 side open. An open oil hole 12 is also provided.

A hole 13 is bored in the crank balancer drive gear 10 at a location opposite to the central axis of the crank pin 5, and the tip side of the plug 14 press-fitted into the hole 13 is
It protrudes into the interior of the opening side of the oil hole 11 via the oil reservoir 8.

This plug 14 is connected to the crank balancer drive gear 10.
The part press-fitted into the crank balancer drive gear 10 has a circular shape, and the outer surface of the tip side protruding from the crank balancer drive gear 10 is flattened by cutting the upper and lower parts of the figure.

As a result, as shown in FIG. 2, the oil hole 11 of the crank pin 5 is not blocked by the upper and lower portions of the plug 14, but communicates with the oil reservoir 8.

The left and right portions of the plug 14 in FIG. 2 are used to stop the crank balancer drive gear 10 from rotating and to adjust its phase.

In this internal combustion engine configured in this way, when the crankshaft 1 rotates due to the movement of the piston (not shown), oil is pumped by an oil pump (not shown) that is linked to the crankshaft 1. As shown, the oil flows through the oil hole 7 and oil hole 9 of the crank journal 3, passes through the oil reservoir 8, oil hole 11, and oil hole 12 formed by shortening the length of the crank pin 5, and flows to the big end 6 of the connecting rod. It turns out.

This oil lubricates the necessary parts of the connecting rod.

Based on the central axis of the crankshaft 1, which is the center of rotation in FIG. 1, the farthest distance of the oil reservoir 8 is r1, and the farthest distance of the oil hole 11 is r', then r>r'
The furthest distance f of the oil reservoir 8 is farther from the center of rotation.

Therefore, when the crankshaft 1 rotates, heavy metal particles contained in the oil move away from the center of rotation within the oil reservoir 8 due to centrifugal force.
The oil is separated and accumulated in a portion 16 outside the oil hole 11 in the oil hole 11 .

This idea has the following effects.

(1) Since the existing crank balancer drive gear 10 can be used and the length of the crank pin 5 can be made slightly shorter than usual, no special parts are required, and there is no increase in cost, assembly man-hours, or weight. To separate contaminants in oil,
It is possible to prevent seizure of the big end 6 portion of the connecting rod and improve its life.

(2) The oil hole 11 of the crank pin 5 and the plug 14 can prevent rotation of the crank balancer drive gear 10 and align the phase. (3) There is no need to provide an oblique oil hole on the crank pin 5. , there are no processing or strength problems.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of one embodiment of this invention, and FIG. 2 is a cross-sectional view taken along the line ■--■ in FIG. 1... Crankshaft, 3... Crank journal, 4... Crank wheel, 5
...Crankpin, 6...Big end? , 9, 11...Oil hole, 8...
- Oil reservoir, 10... Crank balancer drive gear, 14... Plug, 15... End face.

Claims (1)

[Scope of utility model registration request] An oil hole provided along the central axis of the crankshaft in the crank journal of the crankshaft communicates with an oil hole provided along the central axis of the crank pin, and the oil hole provided along the central axis of the crank pin communicates with the connecting rod. In an internal combustion engine in which lubricating oil is guided to the big end of the crank pin, a crank balancer drive gear is press-fitted into the crankshaft on the opening side of an oil hole provided along the central axis of the crank pin. The drive gear is closely connected to the crank wheel, and the length of the crank pin is slightly shortened to form an oil reservoir between the end face of the crank pin and the crank balancer drive gear, and the oil reservoir is directed in the radial direction of the crankshaft. The provided oil hole communicates with the oil hole provided along the central axis of the crankshaft, and the tip of the plug press-fitted into the hole of the crank balancer drive gear is connected to the oil hole provided along the central axis of the crank pin. 1. A lubricating device for an internal combustion engine, characterized in that an outer surface of the plug protruding into the opening and protruding from the crank balancer drive gear is flat.