JP2012047092A - Structure of oil pan in internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil pan 5 that has a flange 6 for connecting to the internal combustion engine 1 and in which the drain port 15 to which the drain plug 16 is detachably threaded is boredly arranged in the bottom plate 7, in which the breakage of the drain plug is reduced without making deep-draw work of the oil pan difficult.SOLUTION: The inclining plate 13 inclining obliquely forward from the lowest and deepest part 11 of the bottom plate to the side face plate 9 in the oil pan is arranged in the bottom plate 7, part of the inclining plate is recessedly formed in the flat plane parallel to the flange or recessedly formed in the flat plane substantially parallel to the flange in the inclining plate, thereby the flat face plate 14 is arranged, and the drain port 15 is boredly arranged in the flat plate.

Description

  The present invention relates to the structure of an oil pan attached to the lower surface of a cylinder block in an internal combustion engine.

  In general, an oil pan in an internal combustion engine is manufactured by deep drawing a thin metal plate. A flange portion for joining to the internal combustion engine is integrally formed on the outer periphery of the upper end of the oil pan. A drain port for discharging water is formed, and the drain port is opened and closed by a drain plug that is detachably screwed to the drain port.

  However, the drain plug screwed into the drain port is likely to be loosened or damaged due to frequent hitting of pebbles and the like that have been lifted from the ground when the vehicle is running, and rubbing the ground. .

  Therefore, conventionally, for example, as described in Patent Documents 1 and 2, etc., an inclined plate that is bent so as to be inclined obliquely upward is formed on a portion of the bottom plate of the oil pan that is continuous with the side plate of the oil pan. The drain port is formed in the inclined plate.

JP 2004-211597 A JP 2004-2933307 A

  According to this conventional configuration, in addition to the drain plug being easily detachable, the drain plug is located at a position higher than the lowest part of the bottom plate. The frequency with which the drain plug hits the drain plug and the drain plug rubs against the ground can be reduced more reliably than when the oil port is drilled in the bottom plate of the oil pan.

  However, on the other hand, the axis of the drain port to which the drain plug is screwed is inclined with respect to the joining flange portion in the oil pan by the inclination angle of the inclined plate obtained by bending a part of the bottom plate. The drain port and the bolt hole for the joining flange portion cannot be drilled simultaneously, and must be drilled separately, resulting in an increase in manufacturing cost.

  In particular, Patent Document 1 describes that in order to further reduce loosening and damage of the drain plug, a bulge is formed around the inclined plate so as to surround three sides of the drain plug. However, the formation of the bulge of the raised portion requires processing for that purpose, and deep drawing from the metal plate becomes more difficult, resulting in a significant increase in cost.

  This invention makes it a technical subject to eliminate these problems.

In order to achieve this technical problem, the present invention
“In an oil pan provided with a flange portion for joining to the internal combustion engine on the outer periphery of the upper end, and a drain port in which a drain plug is detachably screwed on the bottom plate,
The bottom plate is provided with an inclined plate that is inclined obliquely upward from the lowest bottom portion of the bottom plate toward the side plate of the oil pan, and a portion of the inclined plate is parallel to the flange portion. A flat plate was provided by forming a recess in a plane or by forming a recess in a plane nearly parallel, and the drain port was drilled in the plane plate. "
It is characterized by that.

  According to this configuration, the flat plate provided on the inclined plate in the bottom plate is in a state where the other portions are recessed from the bottom and the inclined plate except for a part of the periphery of the flat plate.

  As a result, the other part of the periphery of the flat plate except for a part thereof is surrounded by a portion of the bottom plate that protrudes downward from the flat plate. The frequency with which the drain plug screwed into the pebbles hits the ground and the frequency with which the drain plug rubs against the ground can be greatly reduced.

  On the other hand, since a part of the periphery of the flat plate is connected to the inclined plate and there is no portion protruding downward from the flat plate, the drain plug can be smoothly attached and detached. Can do.

  The flat plate is formed by partially denting and deforming the inclined plate, so that it can be easily press-molded as compared with the case where the ridges surrounding the three sides are inflated as in Patent Document 1. Therefore, deep drawing in oil pans is easy.

  Moreover, since the plane plate is parallel or substantially parallel to the joining flange portion in the oil pan, the axis of the drain port drilled in the plane plate matches the axis of each bolt hole in the joining flange portion. Alternatively, the drain ports can be drilled in the same process as the bolt holes, and the manufacturing cost can be greatly reduced in combination with the ease of deep drawing.

It is a top view of the vehicle carrying an internal combustion engine. It is the II-II enlarged side view of FIG. FIG. 3 is a bottom view taken along line III-III in FIG. 2. FIG. 4 is an enlarged sectional view taken along line IV-IV in FIG. 3. FIG. 5 is a VV sectional view of FIG. 4. FIG. 6 is a sectional view taken along line VI-VI in FIG. 4. FIG. 7 is a sectional view taken along line VII-VII in FIG. 4.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  In these drawings, reference numeral 1 denotes an internal combustion engine, and the internal combustion engine 1 is mounted in the engine room 3 of a vehicle 2 traveling forward in the direction of arrow A with its crank axis 4 facing sideways. .

  Reference numeral 5 denotes an oil pan for the bottom of the internal combustion engine 1, and this oil pan 5 is used for joining the internal combustion engine 1 on the outer periphery of its upper end by deep drawing a thin metal plate such as carbon steel. The flange portion 6 is manufactured integrally, and the depth from the joining flange portion 6 is deep at one end portion 5 ′ in the direction of the crank axis 4 and shallow at the other end portion 5 ″. The deep portion of the one end portion 5 'includes a bottom plate 7, a front side plate 8 positioned on the front side with respect to the forward direction of the vehicle 2, and a rear side plate 9 positioned on the rear side. It has.

  Further, a plurality of bolts 10 are formed in the joining flange portion 6 at appropriate pitch intervals.

  The bottom plate 7 in the deep part of the one end 5 ′ of the oil pan 5 is a peak extending along the direction of the crank axis 4 as shown in FIGS. 5 and 6 when viewed from the direction of the crank axis 4. The lowest bottom part 11 formed into a part, the front inclined plate 12 inclined obliquely upward by an angle θ1 from the bottom part 11 toward the front side plate 8, and the bottom unit 11 toward the rear side plate 9. It is formed in a bottom shape by a rear inclined plate 13 that is inclined obliquely upward by an appropriate angle θ2.

  In the rear inclined plate 13, a part of the rear inclined plate 13 is recessed in a plane parallel to the flange portion 6 at a portion that is appropriately higher than the bottommost portion 11 by a dimension S, or a plane close to parallel. A flat plate 14 is provided by forming a recess.

  A drain port 15 is formed in the flat plate 14, and a drain plug 16 is detachably screwed into the drain port 15.

  In this configuration, the flat plate 14 is in a state in which the rear portion of the flat plate 14 is continuous with the rear inclined plate 13, but the other portions are recessed from the bottom 11 and the rear inclined plate 13. It has become.

  As a result, the other part of the periphery of the flat plate 14 excluding the rear side is surrounded by a portion of the bottom plate 7 that protrudes downward from the flat plate 14. It is possible to reduce the frequency with which the drain plug 16 screwed into the port 15 hits the pebbles and the like that are lifted from the ground and the frequency with which the drain plug rubs against the ground.

  On the other hand, since the rear portion of the flat plate 14 is continuous with the rear side plate 13 and there is no portion protruding downward from the flat plate 14, the drain plug 16 can be attached and detached. It can be done smoothly.

  Further, the flat plate 14 is formed by partially denting and deforming the rear inclined plate 13, so that the flat plate 14 can be easily pressed as compared with the case where the raised portions surrounding the three sides are formed inflated as in the above-mentioned Patent Document 1. Since it can be molded, deep drawing in an oil pan can be easily performed.

  Further, since the flat plate 14 is parallel or substantially parallel to the joining flange portion 6 in the oil pan 5, the drain port 15 drilled in the flat plate 14 has an axis line in the joining flange portion 6. Since it coincides with or substantially coincides with the axis of each bolt hole 10, drilling can be performed in the same process as each bolt hole 10.

  By the way, in the shallow part of the other end 5 ″ of the oil pan 5, the amount of plastic deformation during drawing is smaller than the amount of plastic deformation in the deep part of the one end 5 ′. There is a high risk of occurrence.

  Therefore, the shallow portion of the other end portion 5 ″ is configured to be provided with a recess portion 17 so that the amount of plastic deformation in the shallow portion of the other end portion 5 ″ can be reduced to a deep portion of the one end portion 5 ′. Therefore, it is possible to reliably reduce the occurrence of wrinkles in the shallow portion of the other end portion 5 ″.

  The embodiment described above is a case where the flat plate 14 is provided on the rear inclined plate 13 in the bottom plate 7. The flat plate 14 is provided on the front inclined plate 12 instead of being provided on the rear inclined plate 13. However, if the rear inclined plate 13 is provided with the flat plate 14, the pebbles that jump from the front to the rear may hit the drain plug 16 when the vehicle travels. It can be reduced at the bottom 11.

DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 Vehicle 3 Engine room 4 Crank axis 5 Oil pan 6 Flange part 7 Bottom plate 8 Front side plate 9 Rear side plate 11 Bottommost part 12 Front inclined plate 13 Rear inclined plate 14 Plane plate 15 Drain port 16 Drain plug

Claims (1)

In an oil pan comprising a flange portion for joining to an internal combustion engine on the outer periphery of the upper end, and a drain port in which a drain plug is detachably screwed on the bottom plate,
The bottom plate is provided with an inclined plate that is inclined obliquely upward from the lowest bottom portion of the bottom plate toward the side plate of the oil pan, and a portion of the inclined plate is parallel to the flange portion. A structure of an oil pan in an internal combustion engine, wherein a flat plate is provided by forming a recess in a plane or by forming a recess in a plane close to parallel, and the drain port is formed in the plane plate.

Images