JP2893556B2 - Split oil pan - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil pan for an engine, and more particularly to an oil pan for an engine, which comprises an upper member fastened to a mounting flange formed on the outer periphery of a lower surface of a cylinder block and a lower member fastened to a lower portion of the upper member. The present invention also relates to a split-type oil pan in which an oil reservoir formed by the two members is formed with a projecting portion which bulges outside the mounting flange of the cylinder block.

[0002]

2. Description of the Related Art In order to increase the capacity of an oil pan bolted to the lower surface of a cylinder block of an engine,
The outer periphery of the oil pan protruding outside the coupling surface with the cylinder block is disclosed in Japanese Utility Model Application Laid-Open No. 62-67946.
It is publicly known from Japanese Patent Publication No.

[0003]

When an oil pan having such an overhang is fastened to the lower surface of the cylinder block by bolts, the overhang projects outside the coupling surface of the cylinder block. Even if the oil pan is to be fastened to the coupling surface of the cylinder block with a bolt that penetrates the mounting flange formed on the upper edge of the pan from below, it is difficult to tighten the bolt because it is obstructed by the overhang. Therefore, in the above-mentioned conventional art, the oil pan is fastened to the coupling surface of the cylinder block using a long bolt penetrating the oil pan in the thickness direction.

[0004] However, when a long bolt is used as described above, not only the workability of assembling is reduced, but also the tightening torque becomes unstable due to the torsion of the bolt.
There is a problem that the structure of the bolt hole is complicated in order to prevent oil leakage.

Further, if an overhang portion is formed in the oil pan, the oil level spreads and the oil undulates, and there is a problem that generated bubbles are easily sucked from the strainer. Further, when the oil pan is formed by dividing the oil pan into an upper member coupled to the lower surface of the cylinder block and a lower member coupled to the lower surface in order to form the overhang without using a core, There is a problem that the rigidity is lower than that of an integrally formed oil pan.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and simplifies the work of fastening a split-type oil pan having an overhang to a cylinder block, and has an oil pan having a function of preventing oil ripples. It is intended to have a high rigidity.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an upper member fastened to a mounting flange formed on an outer periphery of a lower surface of a cylinder block and a lower member fastened to a lower portion of the upper member. A split type oil pan, wherein an oil reservoir formed by the two members is formed with a projecting portion bulging outward from a mounting flange of a cylinder block, wherein the projecting portion is formed on an outer periphery of the oil reservoir. And a plurality of recesses are formed between adjacent overhangs and are recessed inward from the mounting flange of the cylinder block, and the upper member is attached to the cylinder block at a position above the recess. The upper member and the lower member are fastened to a flange at least at an outer end of the overhang portion.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, a cylinder head 2 and a head cover 3 are connected to an upper surface of a cylinder block 1 of a four-cylinder engine E, and an upper member 4 and a lower member 5 are formed on the lower surface thereof. The oil pan P is connected. A crankshaft 6 rotatably supported inside the cylinder block 1 includes a connecting rod 7
Is connected to a piston 9 which slides on the cylinder 8 via the.

As apparent from FIGS. 2 to 6,
The crankshaft 6 is supported by five plain bearings 11 sandwiched between a bearing support ₁₁ of the cylinder block ₁ and a bearing cap 10 at five journals 61 formed apart in the axial direction. .
Three bearing cap 10 in the center is fastened to the bearing support portion 1 ₁ in six bolts 13 across the bridge 12 abutting against the lower surface thereof.

Baffle plate 1 formed by pressing a steel plate
4 is fixed by a plurality of bolts 15 from below the boss portion 1 ₂ formed on the lower surface of the cylinder block 1 at its outer periphery. Then, the baffle plate 14 because the avoid interfering with the six bolts 13 for fixing the bridge 12, six openings 14 ₁ the head of the bolt 13 is loosely fitted to the baffle plate 14 Is formed.
As a result, the mounting position of the baffle plate 14 can be raised, and the size of the engine E in the height direction can be reduced. The crankshaft 6 that rotates at high speed
The oil scattered from such, since it is returned to the oil pan P from the opening 14 ₁ of the baffle plate 14 and transmitted to the bolt 13, thereby preventing generation of bubbles the splashed oil may fall directly oil surface . The _two two notches 14 are formed on a rear edge of the baffle plate 14, oil that has lubricated each portion of the engine E is returned to the oil pan P from this notch.

[0012] The strainer supporting member 17 for supporting the strainer 16 disposed in the bottom of the oil pan P is formed in substantially V-shape, one end is the bridge through the opening 14 ₃ formed baffle plate 14 The lower end of the bridge 12 is fixed to the lower surface of the bridge 12 with bolts 18 and the other end is superimposed on the lower surface of the baffle plate 14 and fixed to the lower surface of the bridge 12 with bolts 19. The strainer 16 is connected via an oil tube 20 to a trochoidal oil pump 21 provided at the shaft end of the crankshaft 6.

The lower surface of the cylinder block 1 has a substantially rectangular shape.
Flat mounting flange 1_ThreeIs formed and its mounting
Flange 1_ThreeOf the same shape formed on the upper surface of the upper member 4
Mounting flange 4₁Are joined. As shown in FIGS.
Thus, the upper member 4 has its mounting flange 4₁Down
19 bolts 22 penetrating upward from the cylinder
Mounting flange 1 for block 1_ThreeWill be signed
Mounting flange 4 for upper member 4₁Around the entire circumference
Seal groove 4 except for the hole through which the _TwoFormed
And seal the liquid packing gasket in the seal groove.
As a result, the space between the cylinder block 1 and the upper member 4 is
Sealed.

On one end face of the upper member 4, four
A bolt joined to a transmission case (not shown) by bolts 23
Attached flange 4_ThreeIs formed (see FIGS. 2 and 8).
Mounting flange 4 on the end face_ThreeIs the top mounting flange 4₁
Is formed perpendicular to the
A substantially U-shaped concave portion is formed toward the lupine P side. Upper surface
Mounting flange 4₁And end mounting flange 4_ThreeThe side
A pair of stiffeners 4 forming a viewing triangle_Four, 4_FiveLinked by
Stiffener 4_FourTo the two bolts 24
Than the other stiffener 4_FiveWith one bolt 25
Mounting flange 1 for cylinder block 1_ThreeJoined to
(See FIG. 6). The two mounting flanges 4 ₁, 4_TwoIs
Four reinforcing ribs 4₆Are reinforced by being connected to each other.

The mounting flange 4 ₁ of the mounting flange 1 ₃ and the upper member 4 of the cylinder block 1 is positioned to each other by two dowel pins 26. Moreover, the stiffener 4 _4, 4 each decomposed screw hole 4 _{7 5} of the upper member 4
There are formed mounting flange 1 ₃ of the cylinder block 1 at its threaded degradation screw hole 4 ₇ off to a bolt (not shown)
Is pressed from below, the upper member 4 can be easily peeled off from the cylinder block 1.

A mounting flange 4 ₈ on the lower surface of the upper member 4
It is smaller than the mounting flange 4 ₁ of the upper surface, on its three sides unevenness of waveform is formed. Side wall portions of the mounting flange 4 ₁ of the upper surface of the upper member 4 to the irregularity of the waveform is formed from the mounting flange 4 ₁ so as to be inclined inwardly toward the lower side. With this inclined surface, the height of the oil level can be secured when the vehicle body is inclined or turned. On the other hand, the mounting flange 5 ₁ of the upper surface of the lower member 5 which is coupled to the mounting flange 4 ₈ of the lower surface of the upper member 4 has a lower surface mounting flange 4 ₈ and the waveform portions having the same shape of the upper member 4. Thus, the oil reservoir 27 is formed therein by joining the upper member 4 and lower member 5 has a projecting portion 27 ₁ bulging outward from the mounting flange 1 ₃ of the cylinder block 1, the attachment recesses 27 ₂ recessed inward are formed alternately the flange 1 _3. Mounting flanges 5 ₁ a mounting flange 4 ₈ and the lower member 5 of the upper member 4, while being fastened by bolts 28 passing through the inner end of the outer end and the recess 27 _{and second} projecting portion 27 ₁ in the three sides of the waveform The other straight side is also fastened by the bolt 28. On the lower surface of the lower member 5, to improve the heat radiation effect and the rigidity of the oil pan P, a number of fins 5 ₂ is formed integrally (see FIG. 2).

[0017] Among the upper member 4 and the cylinder block 1 fastening the 19 bolts 22, 11 present that could interfere with the oil pan P corresponds to the inner end of the recess 27 ₂ of the oil reservoir 27 Located at the location. Accordingly, the upper member 4 when fastened to the lower surface of the cylinder block 1 with a bolt 22, the 11 bolts 22 without interfering with the projecting portion 27 ₁ of the oil reservoir 27, the mounting flange 1 ₃ of the cylinder block 1 Can be directly screwed into, and its assembly becomes easy.

Next, the internal structure of the oil pan P will be described. As shown in FIG. 7, a half of the upper member 4 on the transmission case side, that is, a half opposite to the lower member 5,
Shallow bottom part 4 ₉ for guiding the oil to the deep bottom portion 5 ₃ of the lower member 5 in the low position is formed. Shallow bottom 4 ₉ inclined to become gradually lower toward the arrow A direction and the B direction,
Its The upper surface guide ribs 4 ₁₀ for returning oil is parallel to the crankshaft 6. This guide rib 4
₁₀ is intended to prevent the raised splashed by the crankshaft 6 flowing oil along the inclination direction B of the shallow bottom part 4 _9, and it functions to guide along the oil to the tilt direction A, the upper member 4 also contributes to the improvement in rigidity.

A portion of the upper member 4 corresponding to the upper portion of the lower member 5 is formed such that an intermediate portion in the thickness direction is depressed inward (see FIGS. 4 and 5), and extends further inward from the depressed portion. U-shaped plan configuration of the guide ribs 4 ₁₁ are integrally formed as. The guide ribs 4 ₁₁ notches 4 ₁₂ for the passage of the oil tube 20 extending from the strainer 16, the opening 4 ₁₃ level gauge (not shown) is fitted is formed. In this way, by Obahangu a part of the shallow bottom portion 4 ₉ of the above the deep bottom portion 5 ₃ of the lower member 5 guide ribs 4 ₁₁ and the upper member 4 to regulate the inclination of the oil level in the turning time of the vehicle Thus, suction of air from the strainer 16 can be effectively prevented.

As shown in FIG. 10, a deep bottom portion 5 of the lower member 5 is provided.
₃ further is one step lower recess 5 ₄ formed in its recess 5 ₄
, That is, at the lowest position of the oil reservoir 27 of the oil pan P, the strainer 16 is disposed. As the oil in the oil sump 27 from the drain plug 29 provided on one of the projecting portion 27 ₁ of the oil reservoir 27 can be completely discharged, the drain plug 29 is connected to the recess 5 _4.

[0021] To assemble the oil pan P having the above-described configuration, first mounting flange 1 ₃ of the cylinder block 1
And a mounting flange 4 ₁ of the upper surface of the upper member 4 of the oil pan P binds with a positioned state with two knock pins 26. Next, a 19 bolts 22 are inserted from below into the mounting flange 4 ₁ of the upper member 4, the upper member 4
The stiffener 4 _4, 4 ₅ 3 bolts 24 and 25 are inserted from below, fastening the upper member 4 to the mounting flange 1 ₃ of the cylinder block 1. Further the upper member 4 is also fastened to the transmission case by bolts 23 passing through the mounting flange 4 _3. The bolt 22
When tightening, the position of the bolt 22 is
7 because it corresponds to the recess 27 ₂ to avoid the overhanging portion 27 ₁ of the bolt without being obstructed by the projecting portion 27 ₁ 22
Can be easily performed.

[0022] Then, combining the mounting flange 5 ₁ of the lower member 5 to the mounting flange 4 ₈ of the lower surface of the upper member 4, fastened by 19 bolts 28 inserted from below.

While the engine E is operating, the oil that has lubricated each part falls downward by gravity and returns to the oil pan P.
Some of the oil is blocked by the baffle plate 14, it is returned to the oil pan P from the two notches 14 ₂ and six apertures 14 _1. At that time, the oil has reached the upper member 4 is collected in the central part transmitted the shallow bottom part 4 ₉ and guide ribs 4 _11, deep bottom 5 of the lower member 5 from which
Fall to ₃ . The oil stored in the oil sump 27 is supplied to the oil pump 21 via the strainer 16.
And supplied to each lubrication section of the engine E.

[0024] In Thus, by forming a plurality of projecting portions 27 ₁ to the oil sump 27 of the oil pan P, it is possible to increase the capacity of the oil reservoir 27. Further, by forming the projecting portion 27 ₁ and the recess 27 ₂ alternately, with bond strength area of the mounting flange 5 ₁ is increased in the lower surface of the mounting flange 4 ₈ and the lower member 5 of the upper member 4 is increased The rigidity of the oil pan P itself also increases, and the surface area of the oil pan P further increases, thereby improving the cooling performance. In addition, since fluctuations and ripples in the oil level of the internal oil are restricted, the oil can be reliably supplied to the oil pump 21.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various small design changes can be made without departing from the present invention described in the appended claims. It is possible to do.

[0026] For example, the number of the projecting portion 27 ₁ and the recess 27 _{and second} oil reservoir 27 and the layout is not limited to the embodiments can be appropriately changed.

[0027]

As described above, according to the characteristics of the present invention, a plurality of overhangs and recesses are formed alternately along the outer periphery of the oil reservoir, and the upper member is fastened to the cylinder block at a position above the recesses. Accordingly, the oil pan can be fastened to the cylinder block via the recess without interfering with the oil sump while increasing the capacity of the oil sump by the projecting portion. Also, since the oil pan is divided into an upper member and a lower member, a space for the oil reservoir can be easily formed without using a core. Furthermore, since the overhanging portion and the concave portion are alternately formed on the outer periphery of the oil reservoir, not only the inclination and waving of the oil surface are effectively prevented, but also the fastening strength between the upper member and the lower member of the oil pan and the oil pan The rigidity of the oil pan itself is improved, and at the same time, the cooling performance can be improved by increasing the surface area of the oil pan. Moreover, since the upper member and the lower member are fastened at least at the outer end of the overhang portion, the upper member and the lower member are located at a position where the greatest fastening strength is obtained without interfering with the fastening portion between the upper member and the cylinder block. Can be concluded.

[Brief description of the drawings]

FIG. 1 is a schematic side view of an engine.

FIG. 2 is an enlarged view of a main part of FIG. 1;

3 is a longitudinal sectional view of FIG. 2 (a sectional view taken along line 3-3 in FIG. 4).

FIG. 4 is a sectional view taken along line 4-4 in FIG. 3;

FIG. 5 is a sectional view taken along line 5-5 in FIG. 3;

FIG. 6 is a sectional view taken along line 6-6 in FIG. 3;

FIG. 7 is a top view of the upper member.

8 is a view taken in the direction of an arrow 8 in FIG. 7;

9 is a sectional view taken along line 9-9 in FIG. 7;

FIG. 10 is a top view of a lower member.

[Explanation of symbols]

1 ... Cylinder block 1 ₃ ... Mounting flange 4 ... Upper member 5 ... Lower member 27 ... Oil sump 27 ₁ ... Extended portion 27 ₂ ..Recesses

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-298654 (JP, A) JP-A-2-56806 (JP, U) JP-A-2-14443 (JP, U) JP-A-59 60321 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F02F 7/00 302 F01M 11/00

Claims (1)

(57) [Claims] From 1. A lower member fastened to the lower portion of the upper member (4) and said upper member is fastened to the formed mounting flange (1 ₃₎ to the underside periphery of the cylinder block (1) (4) (5) In the oil reservoir (27) formed by the two members (4, 5), a projecting portion (27 ₁ ) bulging outward from the mounting flange (1 ₃ ) of the cylinder block ( ₁ ) is formed. A split type oil pan, wherein the overhang portion (27 ₁ ) is divided into a plurality of portions along the outer periphery of the oil reservoir (27), and a cylinder is provided between adjacent overhang portions (27 ₁ ). A plurality of recesses (27 ₂ ) retreating inside the mounting flange (1 ₃ ) of the block (1) are formed, and the upper member (4) is attached to the cylinder block (1) above the recesses (27 ₂ ). fastened to the mounting flange (1: ₃₎ And it is characterized in that fastened at the outer end of the upper member (4) and at least the protruding portion lower member (5) (27 _1), dividing oil pan.