JPH0636253Y2 - Engine lubricator - Google Patents

Description

[Detailed Description of the Invention] A. Purpose of the Invention (1) Industrial Application Field of the Invention The present invention integrally forms a three-dimensional lattice-shaped skeleton frame on the outside of the cylinder barrel portion and the crank bearing portion of the engine block, Further, the present invention relates to a dry sump type lubricating device for an engine, in which a rigid film member is integrally joined to the outside of the frame.

(2) Prior Art The applicant has already formed a three-dimensional lattice-shaped skeleton frame integrally on the outer walls of the cylinder barrel portion and the crank bearing portion of the engine block that constitutes the main body of the engine body.
Further, a rigid membrane member is integrally joined to the outside of the skeleton frame to propose an engine which is lightweight and has high rigidity (see Japanese Patent Application No. 63-255623).

(3) Problems to be solved by the invention By the way, in the case of such an engine, not only is it lightweight and highly rigid, but it is also required to have higher performance and compactness.

Therefore, in the present invention, the dead space formed in the skeleton frame of the engine body is used to provide an oil reservoir, omitting the oil pan provided under the conventional engine block, and lubricating oil stored therein is covered by the engine. It is an object of the present invention to provide an engine lubrication device having a simple structure in which the lubrication section is efficiently lubricated so as to meet the above-mentioned requirements, and the operation noise of the engine is reduced.

B. Configuration of the Invention (1) Means for Solving the Problems In order to achieve the above object, the present invention integrally forms a three-dimensional lattice-shaped skeleton frame on the outside of the cylinder barrel portion and the crank bearing portion of the engine block, Further, in an engine in which a rigid film member is integrally joined to the outside of the skeleton frame, an oil reservoir is defined by the skeleton frame and the rigid film member, and this oil reservoir and the closed crank chamber are formed. , A check valve such as a reed valve and an oil passage, the oil passage is provided along the outer surface of the side wall of the cylinder unit having a refrigerant jacket, and the oil return port of the cylinder head is connected to the oil reservoir. It is opened right above.

(2) Operation According to the above configuration, the skeleton frame and the rigid film member forming the engine block are used to form the oil reservoir for storing the lubricating oil, and thus the conventional oil pan under the engine block can be omitted. It is possible, and as a result, the overall height of the engine is greatly shortened and its compactness is achieved.

In addition, the lubricating oil in the crank chamber is not forcibly discharged and stored there, the crankshaft rotates smoothly with a low resistance and the rattling noise of the crank web and the air trapped in the oil. Congestion is reduced.
Further, the oil in the crank chamber is effectively cooled by the refrigerant in the refrigerant jacket while returning to the oil reservoir through the oil passage.

Furthermore, by opening the oil return port of the cylinder head directly above the oil reservoir, the return oil from the cylinder head can be quickly returned to the oil reservoir,
Lubricating oil can be effectively used without waste.

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

FIG. 1 is a vertical sectional side view of a main part of an in-line four-cylinder water-cooled engine equipped with the device of the present invention taken along the line II in FIG. 2, and FIG.
A sectional view taken along the line II-II, a sectional view taken along the line III-III in FIG. 1 are shown in FIG. 3, and a sectional view taken along the line IVIV in FIG. 1 are shown in FIG. The block E is composed of a cylinder block B _C , a cylinder head H _C joined to the deck surface 1 of the cylinder block B via a gasket 2, and a lower case C _L attached to the lower surface of the cylinder block B _C. As shown in FIG. 2, it is tilted to one side with respect to the horizontal plane, and the tilt angle θ is about 12 °.

A head cover C _H is attached to the upper surface of the cylinder head H _C. The crankshaft 3 is rotatably supported on the mating surface of the cylinder block B _C and the lower case C _L, and the four _first to fourth cylinder barrels 101 to 1 of the cylinder block B _C are also supported.
Pistons 5 _{1 to} 5 ₄ are slidably fitted to the cylinders 4 ₁ to _{4 4} of 0 ₄ , respectively, and the pistons 5 _{1 to} 5 ₄ and the crankshaft 3 are connected to each other via a connecting rod 6. Has been done.

Next, the structure of the cylinder block B _C will be described mainly with reference to FIGS. 1 to 3 and FIGS. 5, 6, 8 and 9.

FIG. 5 is a cross sectional view of the cylinder block B _{C taken} along line VV in FIG. 2, FIG. 6 is a cross sectional view taken along line VI-VI in FIG. 2, and FIG. Its longitudinal sectional view taken along the line VIII, and Fig. 9 shows the cylinder block B _C and the lower case.
A perspective view of C _L is shown.

The cylinder block B _C is integrally formed by casting a light alloy material such as Fe, Al, or Mg alloy, except for the rigid film member 9 which will be described in detail later, and has a rectangular parallelepiped shape as a whole as shown in FIG. There is. The cylinder barrel collecting portion 7, the skeleton frame 8 and the rigid film member 9 are integrated to form a light weight, high strength and high rigidity.

The cylinder barrel collecting part 7 constitutes a core part which is a main strength member of the cylinder block B _C , and includes four first to fourth parts.
Cylinder barrel 10 _1, 10 _2, 10 _3, and 10 ₄ as a unit body provided continuously in a row. Then the first to the fourth cylinder barrel 10 ₁ to 10 ₄ are formed cylindrical hollow portion 11 ... respectively, the boundary portion is communicated with each other (FIG. 5 of the hollow portion 11, 11 that are adjacent phase reference).

A cylinder liner having an outward flange portion 12 ₁ at the upper end, that is, a wet liner 12, is inserted into each hollow portion 11 to attach the vertical cylinder axis l to the first to fourth cylinder barrels 10 ₁ to 10 _4. Said cylinder with ₁ l ₁
4 ₁ to 4 ₄ are formed. Also, of the cylinder barrel collecting section 7,
Front and rear end walls 21 ₁ and 21 ₂ and first to fourth cylinder barrels 10
The adjacent boundary walls 19 ... (Fig. 4) of ₁ to 10 ₄ are formed to be thick,
High strength of the cylinder barrel collecting portion 7 itself is ensured.
The pistons 5 _{1 to} 5 ₄ are slidably fitted in the cylinders 4 ₁ to ₄ 4 of the wet liner 12 ...
The fourth inner peripheral surface of the cylinder barrel 10 ₁ to 10 ₄ and a wet liner
12 ... Between are refrigerant jacket 13 (the 2,3,5 view) is formed, the first to fourth cylinder barrel 10 ₁ to 10 ₄ and by flowing a coolant such as water to the refrigerant jacket 13 The wet liner 12 ... is forcibly cooled.

The previous longitudinal thickness of the cylinder barrel collecting portion 7, the rear end wall 21 _1, 21 ₂ and the cylinder 4 ₁ to next phase of the collecting portion 7
4 of the wall thickness of between ₄ boundary wall 19 on the lower surface of (FIG. 4), the bearing upper half 22 ... for supporting the journal shaft portion 3 ₁ ... on a half of the crank shaft 3 is formed.

Next, the structure of the three-dimensional lattice-shaped skeleton frame 8 will be described. It mainly serves as a strength member of the cylinder block B _C , and is the same as the collecting portion 7 so as to surround the outer periphery of the cylinder barrel collecting portion 7. It is integrally cast from a material, and as shown most clearly in FIG. 9, a plurality of transverse beam aggregates 15, ..., Vertical beam aggregates 16 ..., And column aggregates 17 ... Then, it is formed in a rectangular parallelepiped shape. Then these aggregates 15 ..., 16 ... and 17 ... structure further be described in detail in, to the cylinder ₄₁ to ₄ in the arrangement direction of the cylinder barrel collecting portion 7 (the crankshaft line direction l ₂ to l ₂₎ On the outer surface of the left and right side walls 18, 18 along the front of the collecting portion 7,
A plurality of the horizontal beam aggregates 15 having a square cross section are integrally erected from the rear end walls 21 ₁ and 21 ₂ and the boundary wall 19 ... Is extended from the cylinder barrel collecting portion 7 in the left and right lateral directions substantially orthogonal to the crank axis lines l _{2 to} l ₂ directions.

At the outer ends of the plurality of horizontal beam aggregates 15 ...
Of the longitudinal beam aggregate 16 having a square cross section and column aggregate 17 ...
Are joined together. The plurality of vertical beam aggregates 16 ... Extend in parallel to each other in the longitudinal direction of the cylinder barrel assembly 7 at substantially equal intervals in the vertical direction, and also the plurality of column aggregates 17
... extend at substantially equal intervals in the longitudinal direction of the cylinder barrel assembly 7 and extend in parallel in the vertical direction.

As described above, the skeleton frame 8 is configured to have a horizontal beam aggregate 15, a vertical beam aggregate 16 and a column aggregate 17 in a three-dimensional lattice form, so that the frame frame 8 is lightweight but has high bending and torsional strength. Is secured.

The left and right outer walls along the crank axis l ₂ to l ₂ direction of the plurality of vertical beams aggregate 16 ... and trabecular bone material 17 ... become more skeletal frame 8 lower from the upper end reaching the deck surface 1 of the cylinder block B _C It is formed in the cylinder bore axis l ₁ to l ₁ direction substantially parallel to the straight plane over the entire length of the vertical direction to the lower end reaching the bonding surface 23 of the case C _L.

As shown in FIGS. 2, 4 and 5, the left and right outer side surfaces 24, 24 of the skeleton frame 8 which are parallel to the crank axis lines l ₂ -l ₂ are metal plates such as steel plate, aluminum plate or FRP. , FRM
The left and right rigid film members 9, 9 made of a single plate of reinforced synthetic resin material such as the above are directly bonded with an adhesive.

FM containing heat-resistant epoxy resin as the main component as the adhesive
-300 (American Cyanamid) is used.

Thus, by forming the left and right outer side surfaces 24, 24 of the skeleton frame 8 into straight surfaces in the vertical direction, the rigid film members 9, 9
Can also be formed by a plate material having a straight surface in the vertical direction, and it becomes easy to manufacture this as a highly rigid material and a vibration damping material.

As shown in FIG. 4, on the lower surface of the cylinder block B _C , the inner and outer connecting bolts 32 having a plurality of lower cases C _L are connected.
It is fixed by…, 33….

Next, regarding the structure of this lower case C _L ,
Explaining with reference to FIG. 9, this lower case C _L has a rectangular parallelepiped skeleton frame 34 whose planar shape is substantially the same as the planar shape of the cylinder block B _C , and the longitudinal direction (crank axis l _{It is} composed of _two rigid film members 35, 35 which are directly adhered to both left and right side surfaces along the _{2 to} 12 direction).

Like the skeleton frame 8 of the cylinder block B _C , the skeleton frame 34 is configured by framing a plurality of horizontal beam aggregates 37, vertical beam aggregates 38, and column aggregates 39 in a three-dimensional lattice form. . And a plurality of horizontal beam aggregates 37 ... are lower cases C _L
Longitudinal are rows in two rows spaced (crankshaft axis l ₂ to l ₂ direction), these transverse beams aggregate 37 ... left and right ends of a plurality of, longitudinal beam bone members 38 ... And pillar aggregate 39 ...
Are integrally connected in the longitudinal direction and the vertical direction of the lower case C _L. When the cylinder block B _C is connected to the lower case C _L as shown in FIGS. 1 to 4, the horizontal beam aggregate 37, the vertical beam aggregate 38, and the column aggregate of the lower case C _L are connected. 39 ... Cross beam aggregate 15 of cylinder block B _C
..., the vertical beam aggregates 16 ... and the column aggregates 17 ... coincide with each other in the vertical direction, and the combined body of the cylinder block B _C and the lower case C _L has the front and rear end faces of the engine block E and the left and right side faces in the vertical direction. It has a straight rectangular parallelepiped shape.

Further, the middle part of the upper and lower horizontal beam aggregates 37 of the lower case C _L has a pair of reinforcing columns 40, 40 extending in the vertical direction with a space left and right.
Are joined together by. And these reinforcement columns
A semicircular bearing lower half 42 for supporting the lower half of the crankshaft 3 is formed on the upper surface of each transverse beam aggregate 37 between 40 and 40.

As shown in FIGS. 2 to 4, when the cylinder block B _C is connected to the lower case C _L , the pair of reinforcing columns 4
0 and 40 are the cylinder barrel collecting parts 7 of the cylinder block B _C.
Of the front and rear end walls 21 ₁ and 21 ₂ and the boundary wall 19 in the vertical direction, and the bearing lower half 42 is the bearing upper half 22 on the lower surface of the cylinder block B _C. To form a plurality of bearing parts b ... Of the crankshaft 3, and these bearing parts b ...
Journal shaft portion 3 ₁ of the crank shaft 3 is rotatably supported via a bearing metal 43 ... as shown in the first to third drawing by. A lower case side mission mating surface 46 having a concave end surface shape is formed on the rear end surface in the longitudinal direction of the lower case C _L.
The lower case side mission mating surface 46 is the cylinder block side mission mating surface 26 of the cylinder block B _C.
Cooperates with the above to form a square mission mating surface, and a mission case (not shown) is joined to this mission mating surface.

As shown in FIGS. 2 to 4 and 7, steel plates, metal plates such as aluminum plates, and reinforced synthetic resin such as FRP and FRM are provided on both left and right sides of the skeleton frame 34 of the lower case C _L , which are vertically straight surfaces. The rigid film members 35, 35 made of a single plate are directly bonded with an adhesive.

FM containing heat-resistant epoxy resin as the main component as the adhesive
300 (American Cyanamid) is used.

As shown in FIGS. 1 and 2, the flat bottom surface of the lower case C _L is closed by a bottom plate 36 integrated with the lower case C _L.

As shown in FIGS. 2 to 4, a rectangular parallelepiped cylinder block B _C composed of the cylinder barrel assembly 7, the skeleton frame 8, and the left and right rigid membrane members 9, 9 is provided on the flat bottom surface of the skeleton frame 3
4, the left, the flat upper surface of the lower case C _L consisting right rigid film members 35, 35 is polymerized, and a plurality thereof is inserted through the lower case C _L from the lower surface of the lower case C _L, among the outer coupling By screwing the bolts 32, ..., 33 to the cylinder block B _C , the cylinder block B _C and the lower case C _L are integrally connected. By coupling the cylinder block B _C and the lower case C _L , the journal shaft 3 ₁ of the crankshaft 3 is mounted on the bearing metal b formed on the mating surfaces of the cylinder block B _C and the lower metal casing C _L.
It is rotatably supported via 43.

As clearly shown in FIGS. 5 to 9, the longitudinal direction of the cylinder block B _C and the lower case C _L , that is, the crank axis l _2
On both end faces in the ~ l ₂ direction are closed by front end walls 25 ₁ and 47 ₁ and rear end walls 25 ₄ and 47 ₄ , respectively, and further between the first and second cylinder barrels 10 ₁ and 10 ₂ , and 3, fourth
Between the cylinder barrels 10 ₃ and 10 _4, there are transverse beam aggregates 15 and 37, respectively.
Are separated by partition walls 25 ₂ , 47 ₂ and 25 ₃ , 47 ₃ which are joined to each other, and the front and rear end walls 25 ₁ , 47 ₁ , 25 ₄ , 47 ₄ and partition walls 25 ₂ , 47 ₂ and 25 ₃ , 47 ₃ and the rigid membrane members 9, 9 and 35, 35 define the interiors of the cylinder block B _C and the lower case C _{L into} three compartments Ch ₁ , Ch ₂ and Ch ₃ . The compartments Ch ₁ is the crankcase C ₁ corresponding to the cylinder 4 _1, the compartment Ch ₂ is crank chamber C _2, C ₃ corresponding to the cylinder 4 _2, 4 _3, compartments Ch ₃ to cylinder 4 ₄ It communicates with the corresponding crank chamber C ₃ . The insides of the compartments Ch ₁ , Ch ₂ and Ch ₃ individually generate pressure fluctuations as the piston 5 moves up and down (the pistons 5 _{2 of} the second and third cylinder barrels 10 ₂ and 10 ₃ ). 5 ₃ moves up and down in synchronization, so no partition is required between them.

Orifices 27 and 27 are provided above the partition walls 25 ₂ and 25 ₃ , respectively.
Is opened, and through the orifices 27, 27, the above 3
The two compartments Ch ₁ , Ch ₂ and Ch ₃ are in communication with each other and the pressure is adjusted.

As shown in FIGS. 1, 2, and 4, on the flat deck surface 1 of the cylinder block B _C , a plurality of long and short connecting bolts 51, 52, ...
Cylinder head H _C is integrally bound by.

In the cylinder head H _C , 53 is a combustion chamber, 54,5
5 is an intake / exhaust port, 56 and 57 are intake / exhaust valves.

Next, the configuration of a lubricating device provided in the engine block E and for forcibly supplying lubricating oil to the lubricated portion of the engine block E will be described.

At one side of the cylinder barrel assembly 7 and the crank bearing b, the cylinder block B _C and the lower case C _L
A large-capacity oil reservoir R _O is formed in the skeleton frame 8, 34 on one side (left side in FIGS. 2 to 4). As shown in FIGS. 2 to 4 and 8, the oil reservoir R _O includes front and rear end walls 25 ₁ , 47 ₁ and 25 ₄ , 47 ₄ of the cylinder block B _C and the lower case C _L and the rigid membrane. It is defined by the members 9 and 35, the upper and lower partition walls 48 and 49 integrally formed with the cylinder barrel collecting portion 7 and the lower case C _L , and the bottom wall 36 of the lower case C _L. The lubricating oil O _i is stored in the oil reservoir R _O.

As clearly shown in FIG. 8, a front inverted T-shaped oil passage 60 is formed in the longitudinal center of the oil reservoir R _O. As shown in FIG. 2, the oil passage 60 is provided along the outer wall of the cylinder barrel assembly 7, and the oil in the oil passage 60 is the cooling water in the refrigerant jacket 13 on the outer wall of the cylinder barrel assembly 7. Cooled effectively by the refrigerant. At the bottom of this oil passage 60, there are four cylinders.
Inlet ports 61 _{1 to} 614 communicating with the crank chambers C _{1 to} C ₄ corresponding to 4 ₁ to _{4 4} are opened, and these ports 61 _{1 to} 6 ₄ are opened.
1 ₄ reed valve respectively provided in the lower wall of the crank chamber C ₁ -C ₄
Each via 61 ₁ to 61 ₄ is communicated with the crank chamber C ₁ -C _4. The reed valve 62 _{1-62 4,} each crank chamber C ₁ -C ₄
Allows oil to flow from the oil passage 60. An outlet port 63 that opens to the oil reservoir R _O is opened at the upper end of the oil passage 60. Therefore, when the pistons 5 _{1 to} 5 ₄ descend due to the operation of the engine, the crank chambers C ₁ to C ₄ below the pistons 5 _{1 to} 5 ₄ are pressurized to reed valve 62.
_{1-62 4} is opened, the stored oil in the crank chamber C ₁ -C ₄ passes through the oil passage 60 from the inlet port 61 _{1-61 4} as shown in FIG. 2 arrow, the oil reservoir from the outlet port 63 Returned to R _O. In this case, outlet port 63 is a cylinder block
Since it is at the high position of B _C , even if the engine block E swings and tilts, the oil O _i in the oil reservoir R _O does not pass through the oil passage 60.
There is no backflow to.

As shown in FIG. 9, an oil pump P _U is connected to one end of the crankshaft 3. The suction port 65 of this oil pump P _U is
As shown in FIGS. 3 and 9, the lower case C _L is connected to the suction passages 66 and 67 provided on the side and the bottom, and the suction passages 66 and 67 are connected to the oil reservoir R _O via the oil strainer 68. To be done. When the oil pump P _U is driven,
The oil in the oil reservoir R _O is sucked into the oil pump P _U through the oil strainer 68 and the suction passages 67 and 66.

Also, as shown in Figs. 8 and 9, the discharge port 70 of the oil pump P _U
Is communicated with the oil gallery 72 via the discharge passage 71.
This oil gallery 72 is integrally formed with the oil reservoir in the skeleton frame 8 as shown in FIGS.
Located across R _O.

The oil gallery 72 is first, second oil gallery 72 _1, 7
2 ₂ and the first oil gear rally 72 ₁ is a skeleton frame 8
From one end to the central portion extending along its length, the inlet 73 to the outer end communicating with the discharge passage 71 is opened, also communicates with the inlet of the oil filter O _F to be described later to the inner end The outflow port 74 is opened. Further, the second oil gear rally 72 ₂ extends substantially parallel to the first oil gear rally 72 ₁ over the entire length of the skeleton frame 8, and
As shown in FIGS. 8 and 9, the rear end is bent at a substantially right angle and extends upward, and an outlet 75 reaching the upper surface of the skeleton frame 8 is opened at the upper end thereof. The outlet 75 communicates with a lubricating oil passage (not shown) on the cylinder head H _C side. The second
At the center of Oirugiyarari 72 _2, resides the second Oirugiyarari 72 interval to ₂ in the right and left sides of the oil filter O inlet 76 which communicates with the outlet of _F are opened further the inlet port 76 to be described later A plurality of oil supply ports 77 ... Are opened, and these oil supply ports 77 ... Are connected to the lubricated parts formed in the cylinder block B _C. For example, as shown in FIG. 3 is communicated with the bearing portion b.

First and Thus, the second Oirugiyarari 72 _1, 72 ₂ formed of Oirugiyarari 72 from being formed integrally with the skeleton frame 8, which functions as a strength member of the skeleton frame 8.

As clearly shown in 4 and 5 Figure, the outer surface of the cylinder block B _C skeletal frame 8, the oil filter O _F is supported screwing, inlet and outlet of the oil filter O _F is as previously described The outlet 74 of the first oil gear rally 72 ₁ and the inlet 76 of the second oil gear rally 72 ₂ respectively communicate with each other.

The pressurized lubricating oil from the oil pump P _U passes through the discharge passage 71
4,5 and 8,9 As shown by the arrow, the first oil gear rally 72
Introduced in ₁ . Lubricating oil flowing through the first Oirugiyarari 72 ₁ flows from the outlet port 74 into the oil filter O _F. Oil filter O _F with cleaned lubricating oil flows into the second Oirugiyarari 72 _2, some of the plurality of the fuel supply port 77 ...
Further, oil is supplied to a plurality of lubricated parts such as the bearing part b of the crankshaft 3 of the cylinder block B _C through the oil supply passages 78.
In addition, the lubricating oil flowing in the second oil gear rally 72 ₂ has an outlet 75
Then, it flows to the oil supply passage (not shown) on the cylinder head H _C side.

The oil gear rally 72 may be formed in the aggregate itself that constitutes the skeleton frame 8.

As shown in FIG. 2, the oil return port 79 of the cylinder head H _C is opened immediately above the upper surface of the opening of the oil reservoir R _O , and the lubricating oil that lubricates the valve operating mechanism of the cylinder head H _C The oil is returned directly from the oil return port 79 to the oil reservoir R _O.

Next, the operation of this embodiment will be described.

When the engine is operated, the four pistons 5 _{1 to} 5 ₄ reciprocate up and down in the cylinders 4 ₁ to 4 ₄ with a predetermined phase difference to rotate the crankshaft 3. At that time compresses the crank chamber C ₁ -C ₄ piston 5 ₁ to 5 ₄ on the downward movement step corresponding thereto (second, third cylinder 4 _2, 4 ₃ of the piston 5 _2, 5 _3, since the phase , And simultaneously compress the corresponding crank chambers C ₂ and C ₃ ). Thus the plurality of reed valve 62 _{1-62 4} storing sequentially to open the respective crank chambers C ₁ -C ₄ lower, lubricating oil after lubrication, as shown in FIG. 2 arrow reed valve 62 ₁ ~ 62 ₄
Through the oil passage 60 and is returned to the oil reservoir R _O from the outlet 63 of the oil passage 60. The oil flowing through the oil passage 60 is effectively cooled by the cooling water or the like in the refrigerant jacket 13.

The oil in the oil reservoir R _O is sucked up by the oil pump P _U connected to the crankshaft 3. The pressurized oil from the oil pump P _U first Oirugiyarari 72 ₁ as detailed above, to lubricate the lubricated portion of the engine through an oil filter O _F and second Oirugiyarari 72 _2. Then, the return oil from the cylinder head H _C is returned directly to the oil reservoir through the oil return port 79.

The oil after lubrication is stored in the lower part of the crank chambers C _{1 to} C ₄ . Then, the stored oil is re-opened by the reed valves 62 _{1 to} 62 ₄ due to the lowering of the pistons 5 _{1 to} 5 _{4 and} the oil reservoir R _O again.
Returned to.

In the above embodiment, the present invention is applied to the in-line four-cylinder engine. However, it is needless to say that the present invention can be applied to other types of engines, and other than the reed valve, it has the same effect. A valve may be used.

C. Effect of the Invention As described above, according to the present invention, since the oil reservoir for storing the lubricating oil is formed by using the skeletal frame and the rigid film member that constitute the engine block, the conventional oil is stored under the engine block. The pan can be dispensed with, resulting in a compact engine, in particular its overall height.

In addition, the lubricating oil in the crank chamber is not forcibly discharged and stored there, so that the crankshaft rotates smoothly and the crank web does not knock the oil, reducing air entrapment in the oil. It is possible to eliminate the noise caused by the oil being boiled.

Further, since the oil in the crank chamber flows to the oil reservoir through the oil passage along the refrigerant jacket, the oil flowing into the oil reservoir can be effectively cooled.

Further, since the oil return port of the cylinder head is opened directly above the oil reservoir, the return oil from the cylinder head can be quickly returned to the oil reservoir, and the lubricating oil can be effectively used without waste. As a result, the absolute amount of lubricating oil is small, and the capacity of the oil reservoir is correspondingly small.

[Brief description of drawings]

The drawing shows an embodiment of the present invention. FIG. 1 is a longitudinal side view of an in-line four-cylinder water-cooled engine equipped with the device of the present invention taken along the line II in FIG. 2, and FIG. -II is a cross-sectional view of the engine block, Fig. 3 is Fig. 1 and Fig. 7 is a cross-sectional view taken along line III-III, Fig. 4 is Fig. I.
FIG. 5 is a cross-sectional view of the cylinder block taken along line VV in FIG. 2, and FIG. 6 is a cross-sectional view of the cylinder block taken along line VI-VI in FIG. Figure 7 is Figure 2
FIG. 8 is a plan view of the lower case taken along the line VII-VII, FIG. 8 is a longitudinal sectional view of the engine block taken along lines VIII-VIII of FIGS. 2 and 7, and FIG. 9 is an exploded perspective view of the engine block. b ... bearing portion, C ₁ -C ₄ ... crankcase, E ... engine block, H _C: cylinder head, R _O ... Oil reservoir 7 ... cylinder barrel set unit, 8 ... skeletal frame, 9 ... rigid film member, 13 ... Refrigerant jacket, 34 ... Skeleton frame, 35
... Rigid membrane member, 60 ... Oil passage, 62 _{1 to} 62 ₄ ... Reed valve as check valve, 79 ... Oil return port

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location F02F 7/00 G 8503-3G

Claims (1)

[Scope of utility model registration request] 1. A three-dimensional lattice frame frame (8, 34) is integrally formed on the outside of a cylinder barrel portion (7) and a crank bearing portion (b) of an engine block (E), and the frame frame (8, 34) is further formed. in the outer formed by joining together a rigid membrane member (9,35) to the engine of 8,34), the framework frame (8,34) and the rigid film member (9,35) and an oil reservoir (R _O) defining a and the oil reservoir (R _O), closed shape formed crank chamber and (C ₁ -C _4), a check valve, such as a reed valve (62 ₁ to 62 ₄₎ and the oil passage (60 ), The oil passage (60) is connected to the cylinder barrel (7).
Of the side wall (18) having the refrigerant jacket (13), and the oil return port (79) of the cylinder head (H _C ) is opened directly above the oil reservoir (R _O ). An engine lubrication device characterized by.