JPS641478Y2 - - Google Patents

Description

[Detailed description of the invention] This invention consists of a frame-like structure that is attached to the lower part of the cylinder block (crankcase) in an internal combustion engine for the purpose of reducing noise or for versatility in mounting an oil pan. This relates to a sealing device for lubricating oil and blow-by gas between a mating structure (cylinder block, flywheel housing, etc.).

Normally, an oil pan 2 is installed directly at the bottom of the cylinder block 1 of an internal combustion engine, and the oil pan 2 is sealed by making the bottom surfaces of the timing gear case, cylinder block 1, and flywheel housing 4 flush with each other to seal lubricating oil. A gasket 6 was interposed between this mounting surface and the oil pan 2 (see FIG. 1).

Also, instead of the flywheel housing 4, a rear seal retainer 7 is used to form a sealing surface (see Fig. 2). Various structures were adopted, such as one in which a side seal was used for the main cap and the lower end of the main cap was part of the sealing surface with the oil pan.

When a frame-like structure is attached to the lower part of the cylinder block for the above-mentioned purpose, the following structures can be considered, but each has the following drawbacks. As shown in FIG. 3, a gasket 1 is installed between the lower surface of the cylinder block 1, timing gear case 3, and flywheel housing 4 and the frame 10.
1, the thickness of the flywheel housing 4 would increase, resulting in restrictions on the design of the rear power take-off shaft, etc.

Further, as shown in FIG. 4, the frame 10 is attached to the flywheel housing 4 and the front cover 3.
If the cylinder block 1 and the frame 10 were to be sandwiched together, it would be difficult to assemble the frame 10 unless it was co-processed with the cylinder block 1.

Further, as shown in FIG. 5, a cylinder block 1 and a frame 1 are attached to the flywheel housing 4.
0, a sheet gasket 12 is cut between the cylinder block 1 and the frame 10 at the point where it abuts against the flywheel housing 4, and a rectangular cross-section is formed at the corner. A method is adopted in which the rod-shaped sealing material 13 is pushed into a square groove 14 provided in the frame 10.

However, this structure has the following drawbacks: (1) If the seal on the flywheel housing 4 side is damaged when the frame 10 is attached and detached, the flywheel housing 4 must be attached and detached in order to replace the seal.

(2) Extra effort is required to cut the sheet gasket 12 between the frame 10 and the cylinder block 1 to fit the parts.

(3) Structurally, the integral seal on the side of the flywheel housing 4 overlaps with the rod-shaped seal material 13 at the corner, and it is difficult for the seal to secure the necessary surface pressure in this area, resulting in concerns about the sealing function.

It had the following drawbacks.

The present invention was developed in view of the above circumstances, and its purpose is to provide a sealing device for an internal combustion engine that can reliably seal the corner of the frame, cylinder block, and flywheel housing. Our goal is to provide the following.

Hereinafter, the present invention will be explained with reference to FIG. 7 and subsequent figures. In the drawing, 20 is a cylinder block, 21 is a flywheel housing, 22 is an oil pan, 23
is a frame. A seal groove 24 is formed in an end surface 25 of the frame 23 facing the flywheel housing 21. The seal groove 24 is formed on the end surface 2
5, and a U-shaped groove 27 formed in the end surface 25.
The ends of the grooves 27 communicate with the horizontal grooves 26. 28 in the drawing is a sealing member, and this sealing member 28
is formed by forming horizontal portions 30 at both ends of the U-shaped portion 29. The seal member 28 configured in this manner is installed in the seal groove 24 by inserting the horizontal portion 30 into the horizontal groove 26 and inserting the U-shaped portion 29 into the U-shaped groove 27. The frame 23 is assembled into the cylinder block 20 and the flywheel housing 21, and the seal member 28 is attached to the cylinder block 2 at the T-shaped portion 31.
0, contacting the flywheel housing 21 in two directions. A liquid gasket or a conventional sheet gasket 32 is interposed between the cylinder block 20 and the frame 23 and between the cylinder block 20 and the flywheel housing 21.

Productivity, cost, and frame 2 of sealing member 28
The seal member 28 was installed in consideration of ease of installation into 3.
The material used is a mixture of cork and rubber, with a filling rate of 100% or more and 120% or less relative to the groove cross-sectional area. In this case, the cross section of the sealing member 28 is a simple rectangular shape and functions satisfactorily.

Ordinary O-ring rubber can also be used as the material for the seal member 28. In this case, since the filling rate of the seal groove cannot be increased to 100% or more, a seal member 28 having a protrusion 34 formed on the upper surface of a horizontal portion 30 of the seal member 28 as shown in FIG. 9 is used.

The basic cross-sectional area of the sealing member 28 is normally set to be 80% or less of the sealing groove 24 like an O-ring, and the protrusion 34 is equal to or more than the depth h of the horizontal groove 26 (approximately 20% or less more) Set to .

The width of the protrusion 34 can be arbitrarily set depending on the size of the seal body, but it may be made equal to the width of the seal member 28. In this case, the protrusion 34
3 - cylinder block 20, flywheel housing 21 - cylinder block 20, frame 2
3 to serve as contact points for the three seals of the flywheel housing 21. T of seal member 28
The leg portion 35 of the character portion 31 is selected at a position where it does not overlap with the protrusion 34. By doing so, the force with which the protrusion 34 is pushed by the cylinder block 20 can be utilized by sufficiently increasing the surface pressure of the seal. In addition, in this case, even if the height of the protrusion 34 is made too large, the T-shaped portion 3
Since there is room to escape to the left and right of 1, the seal member 28
There are also production advantages in that the protrusion 34 is less likely to be damaged and the dimensional accuracy of the height of the protrusion 34 does not need to be strictly controlled.

As described in detail above, the present invention has the advantage that the end surface 2 of the frame 23 facing the flywheel housing 21 is
5, a horizontal groove 2 formed on the upper edge of this end surface 25
6 and a U-shaped groove 27 formed in the end surface 25 and connected to the horizontal groove 26 at its ends, and horizontal portions 30 are formed at both ends of the U-shaped portion 29 to form the seal member 28. This seal member 28 is inserted into the seal groove 24, and the frame 23 is attached to the cylinder block 20 and flywheel housing 21.
This is characterized in that the T-shaped portion of the seal member 28 is brought into contact with the cylinder block 20 and the flywheel housing 21 by assembling the seal member 28 into the cylinder block 20 and the flywheel housing 21.

Therefore, the sealing between the end face of the frame 23 and the flywheel housing 21 and the sealing of the corner can be performed independently, and the necessary surface pressure is ensured at the T-shaped portion, so that the frame 23 The corner formed by the cylinder block 20 and flywheel housing 21 can be reliably sealed.

[Brief explanation of the drawing]

Figures 1 to 5 are explanatory diagrams of a conventional sealing device, Figure 6 is a detailed diagram of the part shown in Figure 5, Figure 7 is an explanatory diagram of the configuration of an embodiment of the present invention, and Figure 8 is an exploded perspective view of the same. , FIG. 9 is a perspective view of another embodiment of the sealing member, and FIG. 10 is an explanatory view of the operation of the same sealing member. 23 is a frame, 24 is a seal groove, and 28 is a seal member.

Claims (1)

[Scope of utility model registration request] Flywheel housing 21 of frame 23
A sealing groove 24 is formed on the end surface 25 facing the end surface 25, which is composed of a horizontal groove 26 formed on the upper edge of the end surface 25 and a U-shaped groove 27 formed on the end surface 25 and having an end connected to the horizontal groove 26, Horizontal portions 30 are formed at both ends of the U-shaped portion 29 to constitute a seal member 28, and this seal member 28 is inserted into the seal groove 24, and the frame 23 is assembled to the cylinder block 20 and flywheel housing 21 to seal it. T of member 28
A sealing device for an internal combustion engine, characterized in that a letter-shaped portion is in contact with a cylinder block 20 and a flywheel housing 21.