JPS61185609A - Mounting device for oil agitation preventing baffle plate in internal-combustion engine - Google Patents

Abstract

PURPOSE:To prevent an excessive torque from being applied to a baffle plate, and prevent the generation of yielding and crack, by fixing the baffle plate to a lower surface of a bridge member connecting a plurality of bearing caps to separate a crank shaft from an oil reservoir. CONSTITUTION:A crank shaft 14 is rotated by operating an engine. A baffle plate 26 is provided to suppress agitation of a lubricating oil in an oil reservoir 28 because of the rotation of the crank shaft 14 and prevent the oil scattered from striking on an oil surface in an oil pan 6 to thereby suppress mixing of air into the oil. As the baffle plate 26 is solely mounted to a lower surface of a bridge member 12, an excessive torque is not applied to the baffle plate 26 to prevent thereby the generation of yielding and crack of the baffle plate 26.

Description

DETAILED DESCRIPTION OF THE INVENTION A0 OBJECTS OF THE INVENTION (1) Industrial Field of Application The present invention relates to a baffle plate mounting device for preventing oil-clean lubricating oil from being stirred in an internal combustion engine.

(2) Conventional technology Generally, a baffle plate is provided in the crank chamber of an internal combustion engine to block the gap between the crankshaft and the oil reservoir under the crankshaft, and the baffle plate agitates lubricating oil by the rotation of the crankshaft. Technical means are known to prevent air from getting trapped in the oil and to reduce rotational resistance of the crankshaft. Conventionally, however, the baffle plate has been welded to the oil pan, or It is fastened together with the oil pan to the lower surface of the cylinder block crankcase.

(3) Problems to be Solved by the Invention However, when the baffle plate is welded to the oil pan, there is a problem that the baffle plate not only obstructs maintenance of the oil pan but also increases cost. If the oil pan is collinear with the oil pan, the originally required fastening rigidity between the co-rank case and the oil pan will decrease, and the oil pan and baffle plate will resonate, which can also cause cracks. There have been problems such as noise generation and noise.

Therefore, the present invention solves all of the above problems by attaching a baffle plate to the bridge member that integrally connects a plurality of bearing caps that support the crankshaft. (The purpose is to provide a mounting device for the Tuffle plate.

B0 Structure of the Invention (Means for Solving 11 Problems) According to the present invention, in order to achieve the above-mentioned object, a plurality of journal walls are formed in the crankcase portion of the cylinder block, and a plurality of journal walls are fixed to the lower surface of each of these journal walls. The crankshaft is rotatably supported by the bearing cap,
In an internal combustion engine in which the plurality of bearing caps are integrally connected by a bridge member, a baffle plate is fixed to the lower surface of the bridge member, and a baffle plate is provided between the crankshaft and the oil section under the shaft. to block out.

(2) Function The baffle plate is fixed to the lower surface of the bridge member, so that excessive torque is not applied to it, so it does not buckle or crack, and it does not resonate with the oil pan. .

(3) Examples An embodiment of the present invention will be described below with reference to the drawings.

In Figures 1 and 2, the engine body E of an in-line multi-cylinder internal combustion engine
consists of a cylinder block 1, a cylinder head 2 which is superimposed and bonded on the deck surface with a plurality of connecting bolts 4 via a gasket 3, and a cylinder head 2 which is attached to the open lower surface of the cylinder block 1 via a sealing material 5. It is equipped with an oil pan 6.

The cylinder block 1 includes a cylinder portion 1. and a crankcase part 12, a plurality of cylinder bores 7 are arranged in series in the cylinder part 1°, a cylinder liner 8 is cast into each cylinder pore 7, and a piston 9 is slidably fitted therein. Ru. Furthermore, bearing caps 11 are superposed on the lower portions of the plurality of journal walls 10 of the crankcase portion 12, and bridge members 12 are superposed on the lower surfaces of the plurality of bearing caps 11, and bridge members 12 are superposed on the lower surfaces of the plurality of journal walls 10. , a plurality of bearing caps 11 and a bridge member 12 are fixed together with a plurality of connecting bolts 13. and a plurality of journal walls 10
A crankshaft 14 is rotatably supported by the bearing cap 11. The crankshaft 14 is connected to the piston 9 via a connecting rod 15.

A baffle plate 26 made of a metal plate is fixed to the lower surface of the bridge member 12 with a plurality of mounting bolts 27. This baffle plate 26 blocks a space between the crank chamber 24 and an oil reservoir 28 in the oil pan 6, and a gap is formed between its outer periphery and the inner surface of the oil pan 6. In addition, a gutter-shaped lowermost bottom 26° is formed in the axial center of the baffle plate 26, and two main oil return holes 29 are opened there. Holes 30 are each opened.

A valve train chamber 16 is formed in the cylinder head 2, and the valve train chamber 16 is provided with a DO valve having two valve train camshafts 17.
An HC type valve operating mechanism 18 is housed therein, and intake and exhaust valves 19 and 20, which are slidably supported by the cylinder head 2, are opened and closed at predetermined timings by the valve operating mechanism 18.

The valve operating chamber 16 is provided with a sealing material 21 on the cylinder head 2.
The head cover 22 is attached through the head cover 22 and covered by the head cover 22.

As shown in FIGS. 1 and 3, vertical oil return passages 23 are formed at some corner portions of the cylinder block 1 and the cylinder head 2, spanning the corners thereof. This passage 2
The upper end of 3 is opened into the valve operating chamber 16, and the lower end thereof is opened into the crank chamber 24 below the shilling block 1, and the lower end of the opening is located above the oil return hole 30.

In the figure, 31 is an oil strainer immersed in the oil reservoir 28, and 32 is an oil gear hole bored in the bridge member 12.

Next, the operation of the embodiment of the present invention will be explained.

When the engine is now operated, the crankshaft 14 is rotated. The crankshaft 14 and the baffle plate 26 that blocks the oil reservoir 28 below the crankshaft 14 suppress the agitation of the lubricating oil in the oil reservoir 28 due to the rotation of the crankshaft 140.
In addition, since the oil splash caused by the rotation of the crankshaft 14 degrees does not directly hit the oil surface of the oil pan 6, it is possible to reduce the amount of air trapped in the oil.
This prevents oil from becoming a rotational resistance of the crankshaft 14 by eliminating oil pounding caused by oil.

Furthermore, since the baffle plate 26 is attached independently to the lower surface of the bridge member 12, excessive torque is not applied to the baffle plate 26, and there is no fear that the baffle plate 26 will buckle or crack. Further, the baffle plate 26 and the oil pan 6 do not cause resonance, and furthermore, there is no possibility of insufficient sealing due to an increase in the sealing surface.

C1 Effects of the Invention As is clear from the above examples, according to the present invention,
A baffle plate is fixed to the lower surface of the bridge member that connects multiple bearing caps together, and this baffle plate blocks the crankshaft and the amount of oil under the shaft. It is possible to increase its durability by preventing it from becoming sagging or cracking without applying heavy torque. Furthermore, without increasing the sealing surface, the mounting structure of the baffle plate becomes extremely simple and can be provided at low cost, and the baffle plate does not interfere with maintenance of the oil pan or the like.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of the engine body equipped with the device of the present invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a sectional view taken along the line m--■ in Fig. 1. 4 is a sectional view taken along the line IV-IV in FIG. 2. DESCRIPTION OF SYMBOLS 1... Cylinder block, 12... Crank case part, 10... Journal wall, 11... Bearing cap, 12... Bridge member, 14... Crankshaft, 2
6...Baffle plate, 28...Oil reservoir patent applicant Honda Motor Co., Ltd. C-'Representative patent attorney Ken Ochiai '11,''
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Claims (1)

[Claims] A crankshaft is rotatably supported by a plurality of journal walls formed in the crankcase portion of the cylinder block and bearing caps fixed to the lower surfaces of these journal walls, and the plurality of bearing caps are connected to a bridge. In an internal combustion engine integrally connected by a member, a baffle plate is fixed to the lower surface of the bridge member, and the baffle plate blocks the crankshaft and an oil reservoir under the shaft. A mounting device for a baffle plate for preventing oil agitation in an internal combustion engine, characterized by: