JPS639777Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an improvement of a crankshaft support structure for an internal combustion engine, and in particular to a device for supporting the crankshaft so that it does not fall off when replacing the journal metal of the crankshaft. It is.

In a conventional internal combustion engine, as shown in FIG.
is rotatably supported via a main metal bearing 6, and a crank chamber 7 that houses the crankshaft 5.
The rear opening of is closed by a rear lid 8. Therefore, when replacing the main metal bearing 6, the metal cap 4 must be removed, but since the crankshaft 5 is supported by both the support section 3 and the metal cap 4, the metal cap By removing 4, the crankshaft 5 falls off to the rear. Particularly if the engine is large and equipped with a heavy flywheel, a separate device is required to support the crankshaft 5 that falls off, which is not only time consuming and time consuming to disassemble and maintain, but also dangerous. .

The present invention was devised to overcome these drawbacks of conventional internal combustion engines, and includes a support cover attached to the side of the cylinder block to prevent the crankshaft from falling off.

Next, embodiments embodying the present invention will be described with reference to the accompanying drawings starting from FIG. FIG. 2 is a plan sectional view of a horizontal internal combustion engine including a crankshaft support device according to an embodiment of the present invention.

In the figure, a cylinder block 11 supporting a cylinder 10 has a half-cylindrical main metal bearing 1 supporting a journal portion of a crankshaft 12 at its lower part.
3, and this main metal bearing 13 is held between a metal receiving portion 14 of the cylinder block 11 and a lower metal cap 15. A crankshaft support lid 16 that also serves as a side lid is fixed to the side of the cylinder block 11, and the crankshaft support lid 16 is attached to an oil seal 17 of the crankshaft
It also serves as an oil seal case that holds the
The crankshaft 1 is inserted into the support hole 18 bored in its center.
2 is passing through. The rear opening of the crank chamber 19 covered by the cylinder block 11 is covered by a rear lid 20, and a lubricating oil pump (not shown) is installed inside the rear lid 20 via a joint 21.
A main oil gear rally 22 connected to is bored. The metal cap 15 has an oil gear lary 23 that communicates with the main metal bearing 13.
A hollow guide pin 26 for positioning the O-ring 25 is inserted into a hole 24 bored at the end of the oil gear rally 23, and a spacer 27 screwed onto the rear cover 20 is inserted into the hole 24. , is fixed between the rear cover 20 and the metal cap 15 so as to connect them. The spacer 27 is hollow and has an oil hole 2 inside.
8, the oil hole 28 and the guide pin 26
The metal cap 1 is connected to the metal cap 1 through an oil hole 29 inside the metal cap 20 and an oil gear gallery 30 vertically bored inside the rear lid 20.
The oil gear rally 23 on the 5 side and the oil gear rally 22 on the rear lid 20 side are in communication.

When replacing the main metal bearing 13 in an engine with such a crankshaft support structure,
First, the rear cover 20 is removed, and then the metal cap 15 is removed. Then, the crankshaft 12 tries to fall downward due to its own weight, but since both ends of the crankshaft 12 are supported by the crankshaft support lid 16, it stops at a position slightly lower than the rotational position. Also, since the main metal bearing 13 on the metal receiving part 14 side of the cylinder block 11 has a half-split structure, it can be easily removed by shifting it slightly around the crankshaft, and can be easily replaced with a new one. I can do it.

As described above, the present invention provides a cylinder block with main metal bearings that support both ends of the crankshaft, and each main metal bearing is held by a metal cap that is removably attached to the cylinder block in a direction perpendicular to the axis of the crankshaft. In the internal combustion engine, on both sides of the cylinder block,
The crankshaft support cover is attached, the crankshaft is passed through the support hole provided in the crankshaft support cover, and the crankshaft is supported by the crankshaft support cover when replacing the main metal bearing, etc. Even if the metal cap is removed, the crankshaft will not fall off, making it possible for a single worker to disassemble and maintain the crankshaft, and this will greatly help reduce work time and avoid danger.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a conventional internal combustion engine, and FIG. 2 is a plan sectional view of a horizontal internal combustion engine equipped with a crankshaft support structure according to an embodiment of the present invention. 11... Cylinder block, 12... Crankshaft, 13... Main metal bearing, 15... Metal cap, 16... Crankshaft support lid, 18...
Support hole.

Claims (1)

[Scope of utility model registration request] In the internal combustion engine, the cylinder block is provided with main metal bearings that support both ends of the crankshaft, and each main metal bearing is held by a metal cap that is removably attached to the cylinder block in a direction perpendicular to the axis of the crankshaft. Crankshaft support covers are attached to both sides of the cylinder block, and the crankshaft is passed through the support hole provided in the crankshaft support cover. When replacing the main metal bearing, etc., the crankshaft is inserted into the crankshaft support cover. A crankshaft support device characterized in that it is designed to support the crankshaft.