JP2563123B2 - Engine cylinder block reinforcement device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a cylinder block reinforcing device for an engine, and more specifically, it projects downward to the cylinder block side when a reinforcing plate is provided at the bottom of the cylinder block. The present invention relates to a seal structure between a semi-circular convex flange portion that is integrally formed with the semi-circular concave flange portion that is correspondingly formed on the oil pan side.

<< Prior Art >> Generally, an oil pump, a seal bearing fitting for a crankshaft, and the like are integrally provided at the front end portion and the rear end portion of a cylinder block, but a half skirt type cylinder block (hereinafter referred to as a cylinder block). Then, the outer peripheral surface of each of the oil pump and the seal bearing mounting member is projected downward in a semicircular shape, and the outer peripheral surface serves as a convex flange portion for joining the oil pan. On the other hand, the flange portion at the upper edge of the oil pan that is fitted into the lower portion of the cylinder block in a hermetically sealed state is provided with concave flange portions at the front end portion and the rear end portion that match the convex flange portions.

By the way, in recent years, the technical trend of providing a reinforcing plate between a cylinder block and an oil pan for the main purpose of suppressing the opening and closing vibration of the skirt portion of the cylinder block in the width direction and the generation of abnormal noise. There is. The peripheral portion of the reinforcing plate is sandwiched between the cylinder block and the oil pan and fastened together with a plurality of bolts.The front end and the rear end of the reinforcing plate are made of the oil pump, the seal bearing fitting, etc. A notch portion is formed to escape the convex flange portion. Therefore, when installing this reinforcing plate, there is a gap corresponding to the thickness of the reinforcing plate between the convex flange part on the cylinder block side and the concave flange part on the oil pan side. A semi-annular elastic seal material is interposed between the two to seal the gap to prevent outflow of oil and gas. As an example of the reinforcing plate, Japanese Utility Model Laid-Open No. 59-159711 is known.

<< Problems to be Solved by the Invention >> However, in the above-described sealing structure, the left and right ends of the notch for accommodating the convex flange and the left and right ends of the elastic seal member face each other. . In such a facing structure, it is necessary to abut both ends of the elastic seal material against both ends of the reinforcing plate to prevent a gap, but since the elastic seal material is relatively thin and weak, the both ends are notched. If you make sure that it abuts against both ends of the part, it will be easier to make a gap in the up and down direction, and when installing the oil pan on the cylinder block, apply an oil seal such as silicone to the elastic seal material. However, it is difficult to secure the sealing property with this elastic sealing material because the elastic sealing material is apt to be displaced due to the fastening of the bolts and the workability of assembling is poor.

The present invention has been devised to effectively solve the above problems, and its purpose is to eliminate a gap between the left and right end portions of the elastic seal member and the cutout portion of the reinforcing plate, Moreover, it is another object of the present invention to provide a seal device between a cylinder block and an oil pan in which the oil pan can be easily assembled.

<< Means for Solving the Problems >> In order to solve the above problems, the present invention configures an engine cylinder block reinforcing device as follows.

Oil pumps, seal bearing mounting brackets, etc. are integrally provided on the lower front end and lower rear end of the cylinder block so as to project downward in a semicircular shape, and the outer peripheral surfaces of these semicircular projections are joint surfaces. A half skirt type cylinder block forming a convex flange portion, an oil pan having a concave flange portion corresponding to the convex flange portion and joined to a lower portion of the cylinder block in a sealed state, and the oil pan And a cylinder block, the peripheral portion of which is sandwiched and interposed, and the front end portion and the rear end portion are provided with a notch portion for escaping the convex flange portion, and the convex flange portion and the concave plate. A semi-annular elastic seal member held between the flange portion and the left and right end portions of the cutout portion, and the elastic sealant material at the left and right end portions of the cutout portion of the reinforcing plate. Respectively on the opposing surfaces of the right end portions to form an engaging projection or the engaging recess mutually fitted to each other.

<Operation> In the seal device between the cylinder block and the oil pan configured as described above, the engaging projections (or recesses) formed on the left and right end portions of the notch of the reinforcing plate and the left and right end portions of the elastic seal material are formed. By mutual fitting with the engaging recesses (or protrusions), the elastic seal material is reliably positioned and fixed, and it is possible to prevent the elastic seal material from being displaced when the oil pan is assembled. Further, by fitting the engaging projection and the engaging recess, the fitting portion can reliably seal between the cutout portion of the reinforcing plate and the elastic sealing material.

<< Example >> An example of the present invention will be described below with reference to the drawings.

1 and 2 show an oil pan 1 of an in-line 4-cylinder engine.
FIG. 3 is a plan view and a vertical sectional view of FIG.
The figures are a front view and a rear view, respectively, in a state where they are attached to a cylinder block.

As shown in FIGS. 3 and 4, an oil pump 3 and a mounting bracket 5 for mounting a crankshaft seal bearing (not shown) are provided on the lower front end and the lower rear end of the half skirt type cylinder block 6. It is provided integrally. And
The lower half of each of the oil pump 3 and the mounting bracket 5 is projected downward in a semicircular shape, and the outer peripheral surface of each semicircular shape is a convex flange serving as a joint surface for mounting the oil pan 1 in a sealed state. The parts 9 and 10 are formed.

As shown in FIGS. 1 to 4, the oil pan 1 is fitted with the convex flange portions 9 and 10 and has a front end portion (the left end in FIGS. 1 and 2) formed in a semicircular downward shape. A recessed flange portion 2 is formed in which the lower half outer peripheral surface of the housing 3a of the oil pump 3 is inserted into the recessed flange portion 2. On the other hand, a semi-circular concave flange portion 4 is also formed at the rear end portion (right end in FIGS. 1 and 2) of the oil pan 1, and the concave flange portion 4 has a fitting 5 for mounting a seal bearing of a crankshaft. The outer peripheral surface of the lower half is inserted.

On the upper opening edge of the oil pan 1, the concave flange portion 2,
A flat flange portion 7 is formed in succession to 4, and the flange portion 7 and the flange portion 8 of the cylinder block 6 are fastened to each other by a plurality of bolts. A peripheral portion 11a of the reinforcing plate 11 is sandwiched between the flange portions 7 and 8, and the opening and closing vibration of the skirt portion 6a of the cylinder block 6 is suppressed by the reinforcing plate 11.

The flange portion 7 of the oil pan 1 will be briefly described. As shown in FIGS. 8 and 9, the tip end 7a of the flange portion 7 is formed in a natural state with a slight upward inclination so as to have elasticity. When the bolt 7 is fastened to the cylinder block 6 with the bolt 29, the tip 7a is strongly pressed onto the cylinder block 6 through the peripheral portion 11a of the reinforcing plate 11 without any gap. The reinforcing plate 11 is first detailed
As shown in FIG. 2 and FIG. 2, there are notches 12 and 13 at the front and rear ends for escaping the oil pump 3 and the mounting bracket 5, and the oil pump 3 is provided in the notch 12 on the front side and the notch 13 on the rear side. The mounting brackets 5 are housed respectively. The left and right ends of the front and rear cutouts 12 and 13 are close to the concave flanges 2 and 4, respectively.
As shown in FIG. 6 and FIG. 6, engaging projections 14 are formed so as to project inwardly of the concave flange portions 2, 4.

On the other hand, there is a gap corresponding to the thickness of the reinforcing plate 11 between the convex flange portions 9 and 10 and the concave flange portions 2 and 4, and this convex portion is formed in the notches 12 and 13. Flange part
An elastic seal material 15 sandwiched between 9,10 and the concave flange portions 2,4 is provided, and the elastic seal material 15 seals between the convex flange portions 9,10 and the concave flange portions 2,4. It is designed to prevent oil or gas leaks. Here, the left and right ends of the elastic seal material 15 extend to both ends of the notches 12 and 13 of the reinforcing plate 11, and the left and right ends of the elastic seal material 15 are engaged with each other as shown in FIG. A recess 16 is formed, and this engaging recess 16 is fitted into the engaging protrusion 14 of the notches 12 and 13 of the reinforcing plate 11. A silicon-based oil seal 30 is filled between the engagement protrusion 14 and the engagement recess 16.

In other words, with the conventional elastic seal material, the left and right ends of the elastic seal material were simply abutted against both ends of the notches 12 and 13, so if the assembly method of the oil pan comes a little, a gap is likely to occur in the abutted part. However, in the present invention, the gasket
Even if the left and right ends of 15 are slightly displaced to the left and right in FIG. 6, the engagement protrusion 14 and the engagement recess 16 are still in close contact with each other, so there is no risk of oil leakage or the like. Also,
There is no risk that the elastic seal material 15 will be displaced in the front-rear direction due to the bolt fastening when assembling the oil pan 1, and the positioning in the front-rear direction can be reliably performed.

Next, other parts of the reinforcing plate 11 will be further described. The inner portion of the reinforcing plate 11 is recessed toward the oil pan 1 side as shown in FIG. 2 so as not to interfere with the engine counter weight (not shown) or the like. The four beads 17 are located below the trajectory of the counterweight. These beads 17 serve to increase the rigidity of the reinforcing plate 11 in the width direction. The bead 17 is formed with a square important notch 20 and a small notch 21 for oil return, respectively. The important cutout 20 (length A) is on the upper side when the engine is tilted as shown in FIG. 3, and the small cutout 21 (length B) is on the lower side. The reason for doing this is that the volume inside the oil pan 1 is large on the left side and small on the right side in FIG.
This is because a large notch is preferably located on the left side in order to smoothly move the fluid in the oil pan 1 accompanying the vertical movement of the piston.

A supporting plate having a U-shaped cross section on the upper surface of the reinforcing plate 11 between the beads 17 as shown in FIGS. 1, 2, and 7.
22 is fixed by welding. As shown in FIG. 7, the support plate 22 supports and reinforces the main bearing cap 23 of the crankshaft, and the bolts 25 are inserted from the two holes 24 formed in the lower side of the support plate 22 so that the main plate is inserted. The bearing cap 23 is fixed to the support plate 22.

Supporting surfaces 26 and 27 are formed further forward and rearward of the beads 17 at the front and rear ends, and main bearing caps located at the front and rear ends of the crankshaft are fixed and supported on the supporting surfaces 26 and 27. There is. Support surface 26,27
Another bead 28 that is parallel to the bead 17 is formed on the reinforcing plate 11 between the bead 17 and the bead 17. The supporting surfaces 26 and 27 support the load on both ends of the crankshaft, but the notches 12 and 1
Reinforcement plate 1 by this load because 3 are adjacent
The front and rear ends of 1 are easily oscillated in the vertical direction in Fig. 2.
The beads 28 mainly act to suppress this vibration displacement and enhance the durability of the reinforcing plate.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and various modifications are possible. For example, the above embodiment relates to a seal device between a cylinder block and an oil pan of an in-line four-cylinder engine. However, it goes without saying that the present invention is also applicable to other types of engines such as an in-line 6-cylinder engine.

Further, engaging recesses may be formed on the left and right ends of the notches 12 and 13 of the reinforcing plate 11, and engaging protrusions may be formed on the left and right ends of the elastic seal material 15.

<< Effects of the Invention >> As described above, the present invention has the sealing structure between the left and right end portions of the elastic seal member and the left and right end portions of the reinforcing plate notch portion, which has the fitting structure with the engaging projections and the engaging recesses. , It is possible to easily eliminate the gap by mutual engagement of the engaging projection and the engaging recess without having to accurately abut both ends of the elastic sealing material to the both ends of the notch as in the conventional case. Leakage and gas leakage can be prevented, and since it is not necessary to strictly control the abutment between the left and right ends of the elastic seal material and the left and right ends of the cutout, it is not necessary to assemble the oil pan with the cylinder block or the oil pan. It is possible to easily attach the elastic sealing material to, and improve the work efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention. FIG. 1 is a plan view of a state in which a reinforcing plate is placed on an oil pan, and FIG. 2 is II- of FIG. II sectional view taken along the arrow, FIG. 3 is a left side view of FIG. 2 showing the cylinder block assembled, FIG. 4 is a right side view of FIG. 2 showing the cylinder block assembled, and FIG. FIG. 3 is a partially enlarged view of FIG. 3, and FIG. 6 is VI of FIG.
FIG. 7 is an enlarged plan view taken along the line VI, FIG. 7 is a cross-sectional view of a reinforcing plate, FIG. 8 is a schematic cross-sectional view of an oil pan showing a cylinder block assembled, and FIG. 9 is a partially enlarged view of FIG. Is. 1 …… Oil pan 2,4 …… Concave flange 3 …… Oil pump 5 …… Seal bearing mounting bracket 6 …… Cylinder block 9,10 …… Convex flange 11 …… Reinforcement plate 12,13 …… Notch Part 14 ...... Engagement protrusion 15 ...... Elastic seal material 16 ...... Engagement recess

Claims (1)

(57) [Claims] 1. An oil pump, a seal bearing fitting, and the like are integrally provided integrally with a lower portion of a front end and a lower portion of a rear end of a cylinder block so as to protrude downward in a semicircular shape. A half skirt cylinder block having a convex flange portion whose surface is a joint surface, and an oil pan having a concave flange portion that matches the convex flange portion and hermetically joined to the lower portion of the cylinder block. A reinforcing plate having a peripheral edge portion sandwiched between the oil pan and the cylinder block, and a notch portion for escaping the convex flange portion formed at a front end portion and a rear end portion; A semi-annular elastic seal member sandwiched between the flange portion and the concave flange portion and provided between the left and right end portions of the cutout portion, and at the cutout portion left and right end portions of the reinforcing plate. A cylinder block reinforcing device for an engine, characterized in that engaging projections or engaging recesses which are fitted to each other are formed on the surfaces of the elastic sealing material facing the left and right ends.