JP2525482Y2 - Engine oil pan structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to an oil pan structure of an engine, and more specifically, measures for increasing the rigidity of an oil pan upper block interposed between a cylinder block and an oil pan. About.

(Prior Art) Conventionally, as an oil pan structure of this kind of engine, as disclosed in, for example, Japanese Patent Application Laid-Open No. 63-61757, a flange portion to be coupled to a transmission case is provided on a lower surface of a cylinder block of the engine. A frame-shaped oil pan upper block is provided, and an oil pan is provided on a lower surface of the oil pan upper block, and a plurality of bearing caps for supporting a crankshaft of an engine are connected to an upper surface of the oil pan upper block. It is known that a bearing beam is provided so that the vibration generated in the transmission case is transmitted to the bearing beam so that the effect of suppressing the vibration by the bearing beam is exerted. In this case, the oil pan upper block is fastened to the bearing beam by bolts inserted from below.

In addition, the oil pan may be provided with a baffle plate that once receives the oil dripping from the cylinder block and guides the oil to a deep part in the oil pan. By preventing the upper surface of the oil from tilting, the amount of oil stored in the oil pan is secured.

Further, the oil pan upper block may be formed of aluminum to reduce the weight.

(Problems to be solved by the invention) However, the oil pan upper block as described above is
Because of the frame shape, a space is provided below the bearing beam via the oil pan upper block even if the bearing beam is bolted from the lower surface. Therefore, the lower surface of the oil pan upper block through the space is open to the oil pan, and the rigidity of the oil pan upper block itself cannot be reduced, and the vibration suppression effect of the oil pan upper block may not be sufficiently exhibited. There is.

Further, when the oil pan upper block is made of aluminum, the oil pan upper block may be settled on a bolt seat surface (lower surface) due to a tightening force of a bolt inserted from the lower surface thereof.

The present invention has been made in view of such a point, and what is its purpose. By effectively using a baffle plate as a component of the oil pan, the rigidity of the oil pan upper block itself is increased so that the vibration suppression effect of the oil pan upper block can be sufficiently exhibited, and the oil pan upper block It is intended to surely prevent the bolt seating surface from settling.

(Means for Solving the Problems) In order to achieve the above object, a solution of the present invention is to provide an oil pan structure of an engine having a frame-like shape having a flange portion connected to a transmission case on a lower surface of a cylinder block of the engine. An oil pan upper block is provided, an oil pan having a baffle plate is provided on a lower surface of the oil pan upper block, and a plurality of bearing caps for supporting a crankshaft of an engine are connected to an upper surface of the oil pan upper block. A bearing beam is provided. The oil pan upper block is fastened to the lower surface of the bearing beam by a bolt inserted from the lower surface side of the oil pan upper block via the baffle plate.

(Operation) According to the present invention, the frame-shaped oil pan upper block connected to the transmission case by the flange portion with the above configuration allows the oil pan via the baffle plate with respect to the lower surface of the bearing beam located on the upper surface side. Since the baffle plate and the baffle plate are fastened together by bolts inserted from the lower surface side of the upper block, the space provided below the bearing beam and opened to the oil pan via the oil pan upper block is closed by the baffle plate. Thus, the rigidity of the lower surface of the frame-shaped oil pan upper block is effectively increased by the baffle plate, and the rigidity of the oil pan upper block itself is improved.

Further, since the bolt for fastening the oil pan upper block to the lower surface of the bearing beam is inserted from the lower surface side of the oil pan upper block via the baffle plate as described above, the lower surface of the oil pan upper block is Even if the baffle plate located on the side serves as a large washer and the oil pan upper block is formed of aluminum, the lower surface of the oil pan upper block is tightened by the bolts inserted from the lower side of the oil pan upper block. There is no settling on the bolt bearing surface.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show a V-type six-cylinder engine using an oil pan structure according to an embodiment of the present invention, wherein 1 is a cylinder block, and left and right banks L, R of the cylinder block 1 are provided. , A cylinder head (not shown) is provided. And the cylinder block 1 and each bank
Three cylinders 3 are formed between L and R, respectively.

A piston 4 is slidably fitted in the cylinder 3. A crankshaft 6 rotatably supported by a pair of upper and lower bearing caps 5,... Provided at predetermined intervals in the longitudinal direction of the engine is disposed below the cylinder block 1. ing. A lower end of a connecting rod 7 whose upper end is rotatably mounted on the piston 4 is rotatably mounted on the crankshaft 6. The crankshaft 6 is configured to rotate through a connecting rod 7 by a piston 4 that slides vertically in the cylinder 3.

Further, the pair of upper and lower bearing caps 5, 5 are connected to each other by bolts 8, 8 inserted from the lower end of the bearing cap 5 located on the lower side. Further, bearing beams 9, 9 extending in the front-rear direction of the engine, which coincide with the crankshaft 6, are provided at lower end portions of the lower bearing cap 5 located outside the bolts 8, 8 outside the bolts 8, 8. The side ends of a plurality of bearing caps 5 located on the lower side are connected by the bearing beams 9 and 9, respectively.

A lower surface of the cylinder block 1 is provided with a frame-shaped oil pan upper block 11 which substantially matches the lower surface shape. The oil pan upper block 11 is formed of aluminum so as to reduce the weight. Become.
At the rear end of the oil pan upper block 11, there is provided a flange portion 11a extending to a lower front portion of the transmission case 12 connected to the rear surface of the engine 1,
Oil pan upper block 1 with this flange 11a
1 is connected to the transmission case 12, and the vibration generated in the transmission case 12 is transmitted to the oil pan upper block 11 so that the oil pan upper block 11 exerts a vibration suppressing effect. Further, the oil pan upper block 11 is provided with an opposing portion 13 extending inward so as to oppose the lower surfaces of the bearing beams 9, 9. In this case, the oil pan upper block 1 is located below the bearing beams 9 and 9.
A space 14 that opens downward through 1 is provided.

Further, as shown in FIGS. 3 to 6, on the lower surface of the oil pan upper block 11, an oil pan 21 having an edge substantially matching the shape of the lower surface is provided. The oil pan 21 is located below the rear of the cylinder block 1 and is located in the front of the cylinder block 1 below a shallow dish 22 formed in a shallow dish shape for temporarily receiving oil dripped from the rear. And a deep dish portion 23 formed in a deep dish shape for storing oil dripped from the cylinder block 1. Further, an oil pump (not shown) provided in the engine 1 at a height position substantially coincident with the lower surface of the shallow plate portion 22 in front of the shallow plate portion 22 corresponding to above the deep plate portion 23. A baffle plate 25 having an opening 25a at a substantially central portion for inserting an oil strainer 24 for sucking up oil in the deep dish portion 23 is provided. In this case, the baffle plate 25 is
It is formed slightly smaller than the oil strainer
Most of the oil dropped onto the shallow plate portion 22 of the oil pan 21 after being supplied to and circulated to the lubricating portion in the engine through the oil pan 24 is supplied to the baffle plate 25 and the oil pan 21 corresponding above the deep plate portion 23. The baffle plate 25 guides the surface of the oil in the deep dish portion 23 inclined at the time of turning the vehicle, etc., while smoothly guiding the oil into the deep dish portion 4 through a gap or the like. It is trying to ensure the amount of stored oil effectively.

The peripheral side of the baffle plate 25 corresponds to the lower surface of the bearing beams 9, 9, that is, faces the lower surface of the facing portion 13 of the oil pan upper block 11. The oil pan upper block 11 is opposed to the lower surface of the bearing beams 9, 9 via the peripheral side of the baffle plate 25.
13 Fastened by seven bolts 31 inserted from the lower surface side.

Therefore, in the above embodiment, the oil pan upper block 11 coupled to the lower portion of the front surface of the transmission case 12 by the flange portion 11a is attached to the lower surface of the bearing beams 9, 9 located on the upper surface side of the opposed portion 13 with the baffle plate 25. Oil pan upper block through the peripheral side of
11 are fixed together with the baffle plate 25 by bolts 31 inserted from the lower surface side of the opposing portion 13 of the oil pan upper portion 11 between the opposing portions 13 of the oil pan upper block 11 provided below between the bearing beams 9, 9. The space 14 opened to the oil pan 21 via the baffle plate 25 is closed by the baffle plate 25, so that the rigidity strength of the lower surface of the opposing portion 13 of the frame-shaped oil pan upper block 11 is effectively increased by the baffle plate 25, The rigidity of the pan upper block 11 itself is improved, so that the vibration suppression effect of the oil pan upper block 11 can be sufficiently exhibited.

Further, as described above, the bolts 31 for fastening the opposing portion 13 of the oil pan upper block 11 to the lower surfaces of the bearing beams 9, 9 are provided via the peripheral side of the baffle plate 25 by the oil pan upper block 11. The oil pan upper block is inserted from the lower side of the
The opposing portion of the oil pan upper block 11 although the peripheral side of the baffle plate 25 located on the lower surface side of the opposing portion 13 serves as a large washer and the oil pan upper block 11 is formed of aluminum. The bolt seating surface on the lower surface of the facing portion 13 of the oil pan upper block 11 due to the tightening force of the bolts 31 inserted from the lower surface side can be reliably prevented.

(Effects of the Invention) As described above, according to the oil pan structure of the engine of the present invention, the oil pan upper block, which is formed in the transmission case by the flange, is connected to the lower surface of the bearing beam via the baffle plate. Fastened by bolts inserted from the lower surface side, the space under the bearing beam that opens to the oil pan via the oil pan upper block is closed by the baffle plate, effecting the rigidity of the lower surface of the frame-shaped oil pan upper block Thus, the rigidity of the oil pan upper block itself is improved, so that the vibration suppression effect of the oil pan upper block can be sufficiently exhibited. Moreover, by inserting the bolts from the lower surface side of the oil pan upper block through the baffle plate, the baffle plate serves as a large washer with respect to the lower surface of the oil pan upper block, and the bolt of the oil pan upper block formed of aluminum Settling of the seat can be reliably prevented.

[Brief description of the drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a longitudinal sectional front view of an engine excluding a cylinder head, FIG. 2 is a longitudinal sectional side view of an engine according to FIG. 1, and FIG. 3 is a baffle plate and an oil pan. FIG. 4 is a bottom view according to FIG. 3, FIG. 5 is a plan view of a baffle plate, and FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. . 1 ... Cylinder block 5 ... Bearing cap 6 ... Crankshaft 9 ... Bearing beam 11 ... Oil pan upper block 11a ... Flange section 12 ... Transmission case 21 ... Oil pan 25 ... Baffle plate 31 ... bolt

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-294160 (JP, A) JP-A-63-68756 (JP, A)

Claims (1)

(57) [Scope of request for utility model registration] A frame-shaped oil pan upper block having a flange portion coupled to a transmission case is provided on a lower surface of a cylinder block of an engine, and an oil pan having a baffle plate is provided on a lower surface of the oil pan upper block. A bearing beam for connecting a plurality of bearing caps supporting an engine crankshaft is provided on an upper surface of the oil pan upper block, and the oil pan upper block is provided on the upper surface of the oil pan upper block. An oil pan structure for an engine, wherein the oil pan structure is fastened to a lower surface by a bolt inserted from the lower surface side of the oil pan upper block via the baffle plate.