JP2008064017A - Engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine capable of surely holding a baffle plate with a simple constitution, and having a baffle plate hard to cause leakage of oil. <P>SOLUTION: This engine comprises a baffle plate 10 restraining waving of engine oil in an oil pan 4 mounted to a lower side of a crank case 2. A baffle plate body 11 is brought into contact with a bottom face of the crank case 2, so as to introduce a leg part 12 downward from the baffle plate body 11. An introduction end of the leg part 12 is brought into contact with a bottom wall 4b of the oil pan 4, and the oil pan 4 is mounted to the crank case 2, so as to nip and fix the baffle plate 10 between the bottom face of the crank case 2 and the bottom wall 4b of the oil pan 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

    The present invention relates to an engine provided with a baffle plate that suppresses the ripple of engine oil in an oil pan.

  In an engine in which engine oil sucked by an oil pump is supplied and lubricated to various parts of the engine, if the engine oil in the oil pan swells, bubbles will be mixed in the engine oil, and bubbles will be mixed in. If the oil pump sucks in the engine oil that is being used, vibrations from the oil pump may occur, and engine oil may not flow sufficiently to various parts of the engine, so a baffle plate is installed in the oil pan. The engine oil stored in the tank is prevented from rippled.

Conventionally, the baffle plate in such an oil pan is clamped and fixed at the joint between the crankcase and the oil pan (Patent Document 1) or screwed to the lower surface of the bearing box that supports the crankshaft. (Patent Document 2) or welded and fixed to the four-side wall portion of the oil pan (Patent Document 3).
JP 2005-325737 A JP 2005-127149 A JP 2001-098916 A

  However, in the case where the baffle plate is sandwiched and fixed at the joint between the crankcase and the oil pan, oil leakage from the joint may occur. In addition, if the baffle plate is screwed and fixed to the lower surface of the bearing housing that supports the crankshaft, processing such as drilling a screw hole in the bearing housing is necessary, which increases costs. There was a problem. In addition, in the case where the baffle plate is welded and fixed to the four-side wall portion of the oil pan, the material of the baffle plate is limited and a work process called welding work is required, and the joint between the oil pan and the baffle plate is caused by vibration. It has the problem of being easily damaged.

  An object of the present invention is to provide an engine provided with a baffle plate that can securely hold the baffle plate with a simple configuration and that is less likely to cause oil leakage.

  In order to achieve the above object, according to the present invention, the baffle plate main body is brought into contact with the lower surface of the crankcase, the leg portion is led downward from the baffle plate main body, and the lead end of the leg portion is drawn. Is attached to the bottom wall of the oil pan, and the oil pan is attached to the crankcase, so that the baffle plate is sandwiched and fixed between the lower surface of the crankcase and the bottom wall of the oil pan. The present invention according to claim 2 is characterized in that, in the invention described in claim 1, the leg portion is formed in a U-shaped frame structure along the opposite side wall and the bottom wall of the oil pan. Yes.

  Furthermore, in the present invention described in claim 3, the leg portion formed of an elastic body is led out downward from the baffle plate body, the engaging portion is formed on the leg portion, and the locking portion is formed on the side wall of the oil pan. The baffle plate is fixed to the oil pan by engaging the engaging portion with the engaging portion and holding the engaging state with the elastic force of the leg portion.

  In the first aspect of the present invention, the baffle plate body is brought into contact with the lower surface of the crankcase, the leg portion is led out downward from the baffle plate body, and the leading end of the leg portion is brought into contact with the bottom wall of the oil pan. The oil pan is attached to the crankcase so that the baffle plate is sandwiched and fixed between the bottom surface of the crankcase and the bottom wall of the oil pan. By simply fixing the oil pan to the crankcase in the state, the baffle plate can be firmly supported in a stable posture within the oil pan, and the baffle plate can be securely held with a simple configuration and oil Leakage hardly occurs.

  In the invention according to claim 2, the oil pan is reinforced by the leg portion, and the vibration of the oil pan is suppressed.

  According to the third aspect of the present invention, the baffle plate can be easily fixed to the oil pan, the baffle plate can be reliably held with a simple configuration, and oil leakage hardly occurs.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic longitudinal sectional view of an engine to which the present invention is applied. The engine (1) is fitted with an oil pan (4) in a state of closing a lower end opening (3) of a crankcase (2) formed integrally with the cylinder block.

  The crankcase (2) is integrally formed with a partition wall (7) through which a crankshaft insertion hole (6) through which the crankshaft (5) is inserted, and a bearing box is formed in the crankshaft insertion hole (6). (8) is fitted and held, and the crankshaft (5) is pivotally supported by a bearing tool (9) mounted on the bearing box (8).

  A baffle plate (10) is fitted and fixed in the oil pan (4). As shown in FIG. 2, the baffle plate (10) is continuously extended downward from the baffle plate body (11) covering the upper surface opening of the oil pan (4) and the baffle plate body (11). A leg portion (12), a protrusion (13) projecting from the upper surface of the baffle plate main body (11), and a strainer insertion hole (14) penetrating the baffle plate main body (11) are provided. The strainer insertion hole (14) also serves as an oil flow path from the crank chamber (15) in the crankcase (2) to the engine oil reservoir (16) in the oil pan (4).

  As shown in FIGS. 1 and 2, a pair of legs (12) extending downward from the baffle plate body (11) is provided along a pair of opposing side walls (4a) and bottom walls (4b) of the oil pan (4). It has a U-shaped frame structure. In this case, the leg portions (12) may be arranged at three or more locations according to the length of the baffle plate (10).

  Further, the protruding strip material (13) protruding from the upper surface of the baffle plate body (11) is a part of the crankcase (2) when the oil pan (4) is mounted and fixed to the crankcase (2). The baffle plate (10) can be securely clamped between the partition wall (7) and the bottom wall (4b) of the oil pan (4) by abutting against the lower end surface of the partition wall (7) constituting the structure, An engine oil circulation space is secured between the upper surface of the baffle plate body (11) and the lower surface of the partition wall (7).

  In the baffle plate mounting structure configured as described above, the oil pan (4) is mounted and fixed to the crankcase (2) with the baffle plate (10) mounted in the oil pan (4), so that the crankcase ( It is sandwiched between the structural member (partition wall) of 2) and the bottom wall (4b) of the oil pan (4).

  FIGS. 3 and 4 show another embodiment of the present invention, which is a cantilevered elastic piece (12) extending downward from a baffle plate body (11) with a leg (12) of a baffle plate (10). 12a), an arcuate engaging portion (17) bulging outward is formed at the tip portion (lower end portion) of the leg portion (12). On the other hand, the opposing side wall (4a) of the oil pan (4) has a recess (18) in which the engaging portion (17) is fitted. The baffle plate (10) can be securely held on the oil pan (4) by the fitting of the engaging portion (17) and the locking portion (18). In this case, two leg portions (12) constituted by the elastic pieces (12a) are formed on each of the opposite sides.

  Note that two or more legs (12) may be formed on each of the opposing sides, or two on one side and one on the other side. Further, the engaging portion (18) formed in the oil pan side wall (4a) is formed by an arc-shaped protrusion bulging into the engine oil storage portion (16), and the engaging portion ( 17) may be constituted by an arc-shaped groove formed in a concave groove shape or an inwardly bulging state in which the locking portion (18) is fitted.

  In the baffle plate mounting structure having such a configuration, the baffle plate (10) is fixed in a predetermined position on the side wall (4a) of the oil pan (4) by the elastic force possessed by the leg portion (12). Will be held.

  Although the baffle plate (10) in each of the above embodiments is integrally formed of synthetic resin, the baffle plate (10) may be formed of metal.

1 is a schematic longitudinal sectional view of an engine showing an embodiment of the present invention. It is a taking-out perspective view of a baffle plate. It is the engine general | schematic longitudinal cross-sectional view which extracted the principal part in different embodiment. It is a taking-out perspective view of the baffle plate shown in FIG.

Explanation of symbols

  2 ... Crank case, 4 ... Oil pan, 4a ... Oil pan side wall, 4b ... Oil pan bottom wall, 10 ... Baffle plate, 11 ... Baffle plate body, 12 ... Leg, 12 ... Leg, 17 ... Engagement Part, 18 ... locking part.

Claims (3)

In an engine equipped with an oil pan (4) below the crankcase (2) and a baffle plate (10) that suppresses the ripples of engine oil in the oil pan (4),
The baffle plate body (11) is brought into contact with the lower surface of the crankcase (2), the leg portion (12) is led out downward from the baffle plate body (11), and the lead end of the leg portion (12) is connected to an oil pan ( 4) By contacting the bottom wall (4b) of 4) and attaching the oil pan (4) to the crankcase (2), the baffle plate (10) is attached to the bottom surface of the crankcase (2) and the bottom of the oil pan (4). An engine characterized by being sandwiched and fixed between a wall (4b). The engine according to claim 1, wherein the leg portion (12) has a U-shaped frame structure along the opposite side wall (4a) and the bottom wall (4b) of the oil pan (4). In an engine equipped with an oil pan (4) below the crankcase (2) and a baffle plate (10) that suppresses the ripples of engine oil in the oil pan (4),
A leg portion (12) formed of an elastic body is led out downward from the baffle plate body (11), an engagement portion is formed on the leg portion (12) (17), and the side wall (4a) of the oil pan (4) The engaging portion (18) is formed in the engaging portion (18), and the engaging portion (17) is engaged with the engaging portion (18), and the locked state is held by the elastic force of the leg portion (12), thereby baffle. An engine characterized in that a plate (10) is fixed to an oil pan (4).

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