JPH0426665Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a crankcase sealing device for an internal combustion engine such as a diesel engine.

[Conventional technology]

As shown in FIG. 3, generally in a diesel engine, a flyer (flywheel) 3 is fixed to the end of a crankshaft 2 that protrudes through the crankcase 1, and a crankshaft penetrating portion is formed on the outer surface of the crankcase 1. A flyer cover 4 for sealing is fixed with bolts 7.

The flyer cover 4 has the back side facing the crankcase 1.
on the front of the outer wall of the
An O-ring (seal member, (not shown) is fitted into an O-ring groove (not shown) formed in the flyer cover 4.

By the way, the flyer cover 4 in the above-mentioned conventional crankcase sealing device is designed so that the O-ring can be inspected or replaced.
As shown in FIG. 4, it consists of divided bodies 4a and 4b which are vertically separated in half and assembled together with bolts 6, of which the lower divided body 4b is fixed to the oil pan 5.

[The problem that the idea attempts to solve]

However, in the case of the fryer cover 4 of the type that can be separated in the vertical direction as described above, the lower divided body 4b is fixed on the oil pan 5.
When removing the flyer cover 4 to inspect the O-ring, the oil pan 5 must be removed from the crankcase 1, making the inspection work troublesome. Particularly in the case of a marine engine, the oil pan 5 is located below the ship's platform, making the work even more troublesome.

Furthermore, if the flyer 3 is removed from the crankshaft 2, theoretically it is possible to attach and detach the oil pan 5 by moving the split body 4b in the axial direction of the crankshaft 2 without removing the oil pan 5 from the crankcase 1. The divided body 4b is fitted between the crankshaft 2 and the oil pan 5 without any gaps, and the semi-circular fitting part is closely connected to the lower half of the crankshaft 2 via an O-ring, so that it can be easily It is not easy to move the crankshaft 2 in the axial direction, and it is necessary to loosen the oil pan 5 sufficiently without removing it, and when moving the split body 4b, the O-ring may lose its position or be damaged. There are some problems that are easy to understand.

SUMMARY OF THE INVENTION An object of the present invention is to provide a crankcase sealing device for an internal combustion engine that allows the flyer cover to be removed and the O-ring to be inspected and replaced easily and quickly while avoiding interference with the oil pan.

[Means to solve the problem]

In order to achieve the above object, the present invention provides an oil pan under the crankcase through which the crankshaft is passed, and a flyer cover on the oil pan that is connected to the crankshaft outside the crankcase. Insert the fitted O-ring into the O-ring groove, connect the back side to the front of the crankcase, and the lower end to the top surface of the flange of the oil pan, and attach/detach it to the crankcase and oil pan using fixing means such as bolts. In a crankcase sealing device for an internal combustion engine that is freely attached, the flyer cover is connected to one another with a semicircular fitting portion in which an O-ring groove is formed and a joining flange in which a bolt hole is formed. It consists of two split bodies that are almost symmetrical on the left and right sides, and these split bodies are fitted into the crankshaft at the fitting part, and the joining flanges are joined to each other by bolts inserted almost horizontally into the bolt holes. It has a structure in which it can be divided into left and right parts and is connected integrally with each other.

[Effect]

In the present invention, when removing the flyer cover from the crankshaft, it is sufficient to separate it in the left and right direction, and this operation is not interfered with by the oil pan below. Therefore, only the fryer cover can be disassembled and removed regardless of the oil pan.

〔Example〕

An embodiment in which the present invention is applied to a diesel engine will be described below with reference to FIGS. 1 and 2.

In these figures, the reference numeral 10 is a crankcase of a diesel engine, and the reference numeral 11 is a crankshaft provided inside the crankcase 10. The crankshaft 11 penetrates the wall surface of the crankcase 10 and projects outward, and a flyer 12 is fixed to the projecting end.

An oil pan 13 is located under the crankcase 10.
is installed. This oil pan 13 is
The lower end of the crankcase 10 is fixed by placing it on a flange 13a formed in the edge of the upper opening and slightly extending outward from the crankcase 10.

A large diameter portion 11a is formed in the portion of the crankshaft 11 that protrudes outside the crankcase 10, and a flyer cover 1 is provided to cover this large diameter portion 11a.
5 is fixed.

As shown in FIG. 1, the flyer cover 15 is a bell-shaped plate with a flat bottom and an arcuate top, and has a symmetrical shape. The lines are divided so that it can be separated horizontally and divided into two parts. That is, this flyer cover 15
1 is a combination of left and right side divided bodies 15a and 15b that are symmetrical to each other.

Fitting portions 16a and 16b, which are notched in a semicircular arc shape and contact the large diameter portion 11a of the crankshaft 11, are formed on the mating surfaces of the divided bodies 15a and 15b, respectively. These fitting parts 16a, 16
As shown in Fig. 2, there are two O
A ring groove 17 is formed. Also, these 2
The O-ring groove 17 is a drilled hole 17a for oil release.
It communicates with the inside of the crankcase 10 by.

Furthermore, joining flanges 18a and 18b are formed on the mutually mating surfaces of these divided bodies 15a and 15b, respectively, and these joining flanges 1
Bolt through holes 19a and 19b are horizontally bored in a plurality of corresponding predetermined positions of 8a and 18b. In addition, each joint flange 19a, 19b
are formed continuously along the edges of the fitting parts 16a and 16b, and are formed continuously along the edges of the fitting parts 16a and 16b of the crankshaft 11.
The combined state of a and 16b forms a boss.

In addition, the fitting portion 16 of each divided body 15a, 15b
a, 16b Length from the bottom corner to the bottom (first
) is the large diameter portion 11 of the crankshaft 11
The length is set to substantially match the length from the lower end of the circumferential surface of a to the upper surface of the flange 13a of the oil pan 13.

Next, how to attach such a flyer cover 15 will be explained.

First, the flyer 12 is removed from the crankshaft 11, and the
Fit the O-ring 20. Next, left and right divided body 1
At the same time, the fitting parts 16a, 16b of 5a, 15b are aligned with the large diameter part 11a, and the mating surfaces are brought into close contact, and the bottom surface is attached to the flange 13a of the oil pan 13.
Also, align the back side with the outer wall of the crankcase 10. By doing this, the O-ring 20 of the large diameter portion 11a of the crankshaft 11 is fitted into the O-ring groove 17 of the flyer cover 15.

Then, the joining flanges 1 are brought into close contact with each other.
The left and right divided bodies 15a, 15b are fastened with the bolts 21 by horizontally inserting bolts 21 into the bolt through holes 19a, 19b that are drilled corresponding to the left and right divided bodies 15a, 15b. Attach the edge of the bolt 22 to the outer wall of the crankcase 10.
The lower end and the flange 13a of the oil pan 13 are fixed together with fixing means such as bolts (not shown).
Fix it by.

As described above, the flyer cover 15 is fixed to the crankcase 10. Even if the oil inside the crankcase 10 enters the penetrating portion of the crankshaft 11, the O-ring 20 installed between the flyer cover 15 and the large diameter portion 11a of the crankshaft 11 prevents oil from entering further. This prevents the oil from leaking outside from the fryer cover 15. Also, the oil stopped here flows down into the oil pan 13 below through the drilled hole 17a,
It can be stored here.

Further, in the above flyer cover 15, O
When checking the condition of ring 20, use flyer 1.
2 to the crankshaft 11, remove the fixing bolts 21, 22, etc., and separate the divided bodies 15a, 1.
If the crankshaft 5b is separated to the left and right, the entire circumference of the large diameter portion 11a of the crankshaft 11 is exposed, so that the above operation can be easily performed. In the above, the divided body 15
When dividing parts a and 15b into left and right parts, just by slightly moving them, the semicircular arc-shaped fitting parts 16a and 16b can be separated.
Since it is separated from the crankshaft 11 over its entire circumference, it can be easily divided. This also applies to the case of attaching the divided bodies 15a and 15b, but in this case it is easier because the divided bodies 15a and 15b can be brought closer to each other by tightening the bolts 21.

In this way, according to the crankcase sealing device of this embodiment, the flyer cover 15 is split in half so that it can be separated in the left and right directions, so the oil pan 13 below does not get in the way when it is separated. Only the flyer cover 15 can be disassembled. As a result, when inspecting or replacing the O-ring 20 installed inside, there is no need to remove the oil pan from the crankcase as in the past, and the work can be done easily and in a short time.

[Effect of idea]

As explained above, according to the crankcase sealing device for an internal combustion engine of the present invention, the flyer cover is split in half in the left and right directions, so when removing it, it is only necessary to separate it in the left and right directions. The oil pan below does not interfere with operation. Therefore, when inspecting or replacing the O-ring installed between the fryer cover and the crankshaft, there is no need to remove the oil pan from the crankcase as in the conventional case, and only the fryer cover needs to be disassembled. It can be done in a short time without any hassle.

Moreover, when dividing the divided body into left and right parts, by only slightly moving them, the semicircular arc-shaped fitting part is separated from the crankshaft along its entire circumference, so that division can be easily performed. This also applies to the case of attaching the divided bodies, but in this case it is easier because the divided bodies can be brought closer to each other by tightening the bolts.

[Brief explanation of drawings]

1 and 2 are diagrams showing an embodiment of the crankcase sealing device for an internal combustion engine according to the present invention, in which FIG. 1 is a front view and FIG. 2 is a side view partially cut away. be. FIG. 3 is a side view of a conventional crankcase sealing device, and FIG. 4 is a front view. 10...Crankcase, 11...Crankshaft, 13...Oil pan, 15...Fryer cover.

Claims (1)

[Scope of utility model registration request] An oil pan is provided below the crankcase through which the crankshaft is passed, and a flyer cover is provided on the oil pan, and an O-ring fitted to the crankshaft on the outside of the crankcase is fitted into an O-ring groove. Also, in a crankcase sealing device for an internal combustion engine, which is removably attached to the crankcase and oil pan by fixing means such as bolts, with the back surface in contact with the front surface of the crankcase and the lower end in contact with the upper surface of the flange of the oil pan. , the flyer cover 15 has semicircular fitting portions 16a, 16 in which an O-ring groove 17 is formed.
b, and joining flanges 18a, 18b in which bolt through holes 19a, 19b are formed. 1
6a and 16b are fitted onto the crankshaft 11, and the joining flanges 18a and 18b are joined together and are integrally separated into left and right parts by bolts 21 inserted approximately horizontally into the bolt through holes 19a and 19b. A crankcase sealing device for an internal combustion engine, characterized in that it is fastened.