JPH0622097Y2 - Batful Plate - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is provided so as to separate the engine oil pan and the crankshaft rotation space from each other, prevents vibration of the oil, and prevents the oil in the oil pan of the crankshaft from being vibrated. The present invention relates to a baffle plate that prevents agitation, and more particularly, to a baffle plate structure for improving the return of oil accumulated on the baffle plate into an oil pan.

[Prior Art] The oil pan is covered with a baffle plate,
The fluctuation of the oil level can be suppressed. The baffle plate must be capable of suppressing the fluctuation of the liquid level of the oil in the oil pan and smoothly returning the oil falling from above into the oil pan. What happens is that the baffle plate is installed so that if the oil that falls from above accumulates excessively on the baffle plate, the oil that has accumulated on the baffle plate is scraped up by the crankshaft that rotates at high speed, and blow-by This is because the oil consumption of the gas reduction device is increased and the rotational friction loss of the crankshaft is increased.

There are two systems of oil that drop into the oil pan: oil that is supplied to a piston, a connecting rod, etc. and drops from it, and oil that drops from the top surface of the cylinder head through an oil return passage of the cylinder head.

The most conventional baffle plate for oil return is disclosed in Japanese Utility Model Laid-Open Nos. 59-157514 and 59-159711. There, oil return holes that are intermittently extended in the longitudinal direction of the baffle plate body are formed near both sides in the width direction of the baffle plate body.
The oil return hole located on the scraping side of the crankshaft is provided with a rib that protrudes upward along the edge of the oil return hole on the end side in the width direction of the baffle plate body. The oil return hole is provided substantially straight below the oil return passage for returning the oil from the upper surface of the cylinder head to the oil pan, and returns the oil falling from the oil return passage to the oil pan. The ribs lubricate the pistons and connecting rods and drop from there, and the oil that accumulates on the top surface of the baffle plate body is scraped by the rotating crankshaft and flows to one end in the width direction of the baffle plate body. Clamp it in and return it from the oil return hole into the oil pan.

[Problems to be solved by the invention]

However, the above-mentioned conventional device has sufficiently taken measures against the return of the oil, which falls from the piston and the connecting rod and accumulates on the upper surface of the baffle plate body, into the oil pan. It could not be said that sufficient measures were taken to prevent the oil returning to the oil pan via the oil return passage of the block from accumulating on the upper surface of the baffle plate main body, for the following reasons.

What is important is that the lower end of the oil return passage provided in the cylinder block for returning the oil from the upper surface of the cylinder head to the oil pan is at a position considerably higher than the baffle plate body, and the oil falling from the oil return passage is
Part of the oil returns from the oil return passage, passes through the oil return hole provided in the baffle plate body, and returns to the oil pan. To reach the upper surface of the baffle plate body. Even if the oil transmitted through the cylinder block wall tries to reach the oil return hole drilled in the baffle plate body from the top surface of the baffle plate body, it goes upward toward the end of the baffle plate body width direction of the drilled oil return hole. Since there is a rib that extends, it cannot be smoothly blocked by this rib and flows into the oil return hole, and flows between the ribs to the center of the baffle plate body in the width direction. Oil accumulates on the top of the baffle plate. That is, the rib effectively acts on the return of the oil dropped from the piston and the connecting rod part to the oil pan, but on the part of the oil returning to the oil pan through the oil return passage of the cylinder block. Will act to hinder the return.

According to the present invention, the two systems of oil return, namely, the return of the oil falling from the piston and the connecting rod portion to the oil pan, and the return of the oil from the upper surface of the cylinder head to the cylinder block via the oil return passage to the oil pan. It is an object of the present invention to provide a countermeasure for satisfying both return and satisfaction at the same time.

[Means for solving problems]

The baffle plate according to the present invention for achieving the above-mentioned object includes: (a) an oil pan that separates a space for storing oil in the oil pan from a pace in which a crankshaft in a cylinder block is rotatably disposed. Baffle plate body consisting of a plate-shaped member interposed between the cylinder block and the cylinder block, and (b) is located below the oil return passage for returning oil from the cylinder head upper chamber to the oil pan, which is provided in the cylinder block. A first oil return hole formed near the end of the baffle plate body in the width direction, and (c) near the first oil return hole and in the widthwise center of the baffle plate body from the first oil return hole. A rib formed on the baffle plate main body that protrudes upward and extends in the longitudinal direction of the baffle plate main body on the side of Near the center of the baffle plate body in the widthwise central part of the baffle plate body, and on the side where the oil on the baffle plate body is scraped by the rotation of the crankshaft. And a second oil return hole intermittently provided in the.

[Action]

The baffle plate of the present invention is different from the conventional baffle plate in that the ribs extend in the longitudinal direction of the baffle plate body, and the ribs extend from the top of the cylinder head to the end of the baffle plate body in the width direction. Dedicated oil return hole for oil returning to the oil pan through the oil return passage of (1st oil return hole)
Has been established. The second oil return hole functions as a dedicated oil return hole for returning the oil dropped from the piston and the connecting rod portion to the upper surface of the baffle plate body to the oil pan.

With the above configuration, the oils of the two systems are separately returned to the oil pan well. Therefore, the oil from the upper surface of the cylinder head, which has been conventionally prevented from returning to the oil pan by the rib, is also favorably returned to the oil pan.

〔Example〕

Hereinafter, preferred embodiments of the baffle plate according to the present invention will be described with reference to the drawings.

1 to 3 show a baffle plate according to an embodiment of the present invention, and FIGS. 4 and 5 show a state in which the baffle plate is mounted on an engine.

The baffle plate 10 has a baffle plate body 12 and a pair of ribs 14 fixed to the baffle plate body 12, and the baffle plate body 12 has a first oil return hole.
16 and a second oil return hole 18 are provided.

The baffle plate body 12 is made up of the oil 22 in the oil pan 20.
It is composed of a plate-shaped member interposed between the oil pan 20 and the cylinder block 24 so as to separate the space for storing the space and the space in which the crankshaft 26 in the cylinder block 24 is rotatably arranged. Baffle plate body 12
Spreads over the entire oil pan 20 so as to cover the entire surface of the oil pan 20 and suppresses the rocking of the liquid surface of the oil 22 in the vehicle while the oil is rocked, and the oil is scratched by the crankshaft 26 and foams. Prevent.

The first oil return hole 16 is provided in the cylinder block 24 and extends from the cylinder head upper chamber (not shown) to the oil pan.
It is located below (preferably immediately below) an oil return passage 28 for returning oil to 20, and is formed near the widthwise end of the baffle plate body 12. The first oil return hole 16 is interrupted in the longitudinal direction of the baffle plate body 12 and is, for example, a round hole. Since a plurality of oil return passages 28 are normally provided in the longitudinal direction of the cylinder block 24, a plurality of first oil return holes 16 are provided in the longitudinal direction of the baffle plate body 12 as many as the oil return passages 28. . However, it is not necessarily limited to the same number. Further, since the oil return passages 28 are normally provided on both sides of the cylinder block 24 in the width direction, the first oil return holes 16 are also provided on both sides of the baffle plate body 12 in the width direction.

The rib 14 is attached to the baffle plate body 12 in the vicinity of the first oil return hole 16 and on the widthwise center side of the baffle plate body 12 with respect to the first oil return hole 16, for example, by welding. There is. The rib 14 projects upward from the upper surface of the baffle plate body 12 and extends in the longitudinal direction of the baffle plate body 12. Both longitudinal ends of the rib 14 extend to the inner surface of the side wall of the cylinder block 24 in the longitudinal direction or to the vicinity of the inner surface. The ribs 14 are provided on both sides of the baffle plate body 12 in the width direction.

The second oil return hole 18 is provided near the rib 14 and closer to the center portion of the baffle plate body 12 in the width direction than the rib 14. The second oil return hole 18 is formed in the baffle plate body 12
The oil is provided only on the side that is scraped up by the rotation of the crankshaft 26 when the oil hits the top. Therefore, the second oil return hole 18 is provided only on one side in the width direction of the baffle plate body 22.
The second oil return hole 18 and the first oil return hole 16 and the rib
Separated by 14. Therefore, the oil accumulated on the baffle plate body 12 returns to the oil pan 20 independently from the first oil return hole 16 and the second oil return hole 18 which are separated by the rib 14. The second oil return holes 18 are provided intermittently in the longitudinal direction of the baffle plate body 12. The portion where the second oil return hole 18 is not formed corresponds to the crank journal portion of the crankshaft 26. That is, since the oil on the baffle plate body 12 is scraped by the rotation of the crankshaft 26 is the crankpin and the counterweight portion, the second oil return hole 18 is formed at the position corresponding to that portion. Set up.

The central portion of the baffle plate body 12, which is located between the pair of ribs 14, of the baffle plate body 12 is smoothly and slightly curved downward in order to avoid interference with the rotating crankshaft 26 and minimize the engine height. ing.
Therefore, the oil that has dropped from the piston and the connecting rod to the upper surface of the central portion of the baffle plate body tries to accumulate in the center of the curve, and is squeezed to the second oil return hole 18 side by the rotation of the crankshaft. It is returned from the second oil return hole 18 into the oil pan 20.

The baffle plate main body 12 extends in the width direction of the baffle plate main body at a portion where the second oil return hole 18 is not formed and extends between the pair of ribs 14 and projects downward and upward. A plurality of concave grooves 30 are formed. The groove 30 is formed by press-molding the baffle plate body 12 itself, enhances the rigidity of the baffle plate 12 and performs a noise reduction function, and the oil that tries to accumulate on the upper surface of the central portion of the baffle plate body is introduced into the groove 30. Prevents excess oil from accumulating on the upper surface of the central part of the baffle plate body. The baffle plate body 12 is provided with an oil pump insertion hole 32 and a strainer insertion hole 34, respectively. These holes 32, 34 have the same structure and function as the conventional holes. The holes 36 are holes through which bolts for fastening the oil pan 20 and the baffle plate 10 to the cylinder block 24 are inserted.

The baffle plate 10 is interposed and fixed between the cylinder block 24 and the oil pan 20, and in order to prevent oil from leaking from the fixed portion, a liquid gasket 38 (a liquid gasket when mounted, Gasket that solidifies and seals under the heat of operation).

Next, the operation of the above embodiment will be described.

The oil return system that returns to the oil pan 20 is the same as before.
There are two systems: oil 22A that drops from the piston and connecting rod portion to the center of the baffle plate body, and oil 22B that drops from the top surface of the cylinder head to the end of the baffle plate body in the width direction through the oil return passage 28.

Of these, the former oil 22A is scraped by the crankshaft 26 to one side in the widthwise direction of the baffle plate body in the rotational direction, and the second oil return hole is bored there.
It is returned to the oil pan 20 through 18. This oil 22A
The ribs do not block the second oil return hole 18 by being blocked by the rib 14 and reliably return to the inside of the oil pan 20 only from the second oil return hole 18. The rib 14 improves the return of the oil A into the oil pan 20.

A part of the latter oil 22B drops straight downward from the oil return passage 28, passes through the first oil return hole 16 and returns to the oil pan 20. The other part of the oil 22B flows down along the inner wall surface of the cylinder block 24 along the wall surface, and flows down to the upper surface of the end portion of the baffle plate body 12 in the width direction. The oil 22B is blocked by the ribs 14 even if the oil 22B tries to flow to the center of the baffle plate body 12 in the width direction.
It does not flow to the central portion in the width direction of the baffle plate body 12, and returns from the first oil return hole 16 into the oil pan 20. Therefore, the oil 22B is used for the baffle plate body 12
The oil does not flow up to the central portion in the width direction and is not scraped up by the crankshaft 26, and the oil does not flow to the blow-by gas reducing system to increase the oil consumption, thus preventing the oil consumption from increasing.

As described above, in the oil return according to the present invention, the return of the oil A and the return of the oil B are different from each other, and the return of the oil B is improved compared to the conventional case.

With this improvement, the amount of oil accumulated on the upper surface of the baffle plate 10 is reduced. Therefore, the friction torque due to the scratching of the oil by the crankshaft 26 is reduced, and the amount of the oil scattered due to the scraping mixed into the blow-by gas and carried away is also reduced. FIG. 6 quantitatively shows the reduction of the friction torque, of which the curve P shows the friction torque in the present invention and the curve Q shows the conventional friction torque. The shaded area between the curves P and Q indicates the reduction amount of the friction torque. It can be seen that the friction torque reduction of the present invention is effective mainly in the high engine speed range.

[Effect of device]

According to the present invention, a first oil return hole for returning the oil from the oil return passage of the cylinder block is provided on the end side in the width direction of the baffle plate body, and the center of the baffle plate body in the width direction is arranged from the first oil return hole. The ribs 14 extending in the longitudinal direction of the baffle plate body are provided on the side of the cylinder block. The oil can be returned to the oil pan more smoothly than before through the oil return passage, and as a whole of these, the oil return from the upper surface of the baffle plate to the oil pan is better than before and Oil agitation can be suppressed. Therefore, the friction loss due to the stirring and the amount of oil carried away from the blow-by gas reduction system can be reduced.

[Brief description of drawings]

1 is a plan view of a baffle plate according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is taken along line III-III of FIG. Sectional view, FIG. 4 is a sectional view of the vicinity of the lower end of the engine when the baffle plate of FIG. 1 is attached to the engine, FIG. 5 is a sectional view in the direction perpendicular to FIG. 4, and FIG. The torque diagram is 10 …… Baffle plate 12 …… Baffle plate body 14 …… Rib 16 …… First oil return hole 18 …… Second oil return hole 20 …… Oil pan 22 …… Oil 22A …… Piston and connecting rod part Oil 22B …… Oil from the top of the cylinder head 24 …… Cylinder block 26 …… Crankshaft 28 …… Oil return passage

Claims (1)

[Scope of utility model registration request] (A) An oil pan is interposed between an oil pan and a cylinder block so as to separate a space for storing oil in the oil pan from a space for rotatably mounting a crankshaft in the cylinder block. B) A baffle plate body consisting of a plate-shaped member, and (b) is located below the oil return passage provided in the cylinder block for returning oil from the upper chamber of the cylinder head to the oil pan, and near the widthwise end of the baffle plate body. A first oil return hole formed on the baffle plate main body in the vicinity of the first oil return hole and on the widthwise central portion side of the baffle plate body from the first oil return hole, and The rib formed on the baffle plate body extending in the longitudinal direction of the baffle plate body, and (d) near the rib, the width of the baffle plate body from the rib. The second oil provided on the baffle plate main body on the side of the central portion toward which the oil on the baffle plate main body is scraped by the rotation of the crankshaft and provided intermittently in the longitudinal direction of the baffle plate main body. Baffle plate consisting of return hole and.