JP3701935B2 - Oil pan structure in the engine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an oil pan structure provided in a lower portion of a cylinder block of an engine, mainly a vehicle engine, for storing lubricating oil.
[0002]
[Prior art]
Conventionally, in a wet sump engine having an oil pan on the lower surface of a cylinder block, the oil pan is generally formed integrally and fixed to the lower surface of the crankcase at the bottom of the cylinder block (for example, a special (See Kaisho 55-64128).
[0003]
[Problems to be solved by the invention]
By the way, the oil pan of such a wet sump engine only stores the amount of oil necessary to sufficiently lubricate each lubricated system of the engine and to dissipate heat from the oil pan to the outside air to lower the oil temperature. Therefore, it is desirable that the oil pan has a large capacity.
[0004]
However, if the capacity of the conventional integrated oil pan is increased, the oil pan itself becomes large, and there is a problem that not only the manufacturing cost increases but also the engine itself becomes large.
[0005]
The present invention has been made in view of such a situation, and a part of a transmission case that covers a timing mechanism for driving a valve camshaft of a valve system can be used as a part of an oil pan. It is an object of the present invention to provide an oil pan structure for a new engine that solves the problem and further allows the dead space of the engine to be used as a capacity space of the oil pan.
[0006]
[Means for Solving the Problems]
In order to achieve the object, the invention of claim 1 is provided with a timing transmission mechanism for transmitting the driving force of the crankshaft to the valve camshaft on one end face of the cylinder block in the crankshaft direction. In an engine in which a mechanism is covered with a transmission case, an oil pan body having one end face in the crankshaft direction is fixed to the lower surface of the cylinder block, and on the other hand, the transmission case is lower than the lower surface of the cylinder block. The extension portion is integrally formed on the opening end surface of the oil pan body, and an oil pan is constituted by the extension portion of the transmission case and the oil pan body. The extension portion is located below the accessory driving pulley that is fixed to the outer end of the transmission case of the crankshaft, and has a U-shaped longitudinal section. Beyond the width of the crankshaft direction of the driven pulley and protrudes crankshaft outwardly, it is characterized in that the lower is covered in auxiliary device driving the drive pulley by its overhang.
[0007]
According to the above feature, since the oil pan is constituted by the downward extension portion of the transmission case and the oil pan body, a part of the transmission case (extension portion) can be used as a part of the oil pan. A sufficient amount of lubricating oil required in the oil pan can be secured without depending on the enlargement of the oil pan body. Moreover, the extension part of the transmission case is located below the driving pulley for driving the auxiliary machine fixed to the outer end of the transmission case of the crankshaft and has a U-shaped longitudinal section. Since the drive pulley extends beyond the crankshaft direction outward in the crankshaft direction, the extension of the transmission case increases the capacity of the oil pan chamber in the oil pan, and the lubricating oil in the oil pan The extension can be extended outwardly so as to occupy the dead space below the drive pulley, and the extension covers the lower part of the drive pulley for driving the accessory. Therefore, the dead space can be used effectively, the engine itself is not enlarged, and the driving pulley and the transmission band are excellently protected.
[0008]
According to a second aspect of the present invention, in addition to the above feature of the first aspect , an upper wall of the overhanging portion having a U-shaped longitudinal section is curved so as to follow a lower outer periphery of the driving pulley for driving the auxiliary machinery. Thus, the lower part of the driving pulley for driving the auxiliary machine is covered along the outer periphery of the lower part.
[0009]
According to a third aspect of the present invention, in addition to the above feature of the first or second aspect, an oil pump that can be assembled therein through the opening end face of the oil pan body is opposed to the internal space of the overhanging portion. It has as a feature.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below based on the embodiments of the present invention shown in the accompanying drawings.
[0011]
In this embodiment, the present invention is applied to an in-line four-cylinder four-cycle engine. FIG. 1 is a partially broken side view of the engine, FIG. 2 is a partially broken front view of the engine, 3 is a longitudinal sectional view of the engine taken along line 3-3 in FIG. 1, FIG. 4 is a partial side view of the engine taken along line 4-4 in FIG. 2, and FIG. 5 is taken along line 5-5 in FIG. FIG. 6 is a sectional view taken along line 6-6 in FIG. 5, and FIG. 7 is a perspective view of the oil pan body.
[0012]
1 to 4, an engine body 1 of a four-cycle engine E includes a cylinder block 2, a cylinder head 3 that is coupled to a deck surface of the cylinder block 2 by a connecting bolt with a gasket interposed therebetween, and a crankcase side of the cylinder block 2. It comprises a bearing cap integrated oil pan (hereinafter simply referred to as an oil pan) 4 that is also coupled to the lower end surface by a connecting bolt with a packing interposed therebetween.
[0013]
As clearly shown in FIG. 3, a plurality of bolt through holes 7 ₁ , 17 ₁ ; 7 ₂ , 17 ₂ that correspond to each other are respectively provided on the front and rear sides in the width direction of the cylinder block 2 and the cylinder head 3, that is, on both sides in the crankshaft direction. The cylinder head 3, the cylinder block 2 and the oil pan 4 are provided side by side in the crankshaft direction, and pass through the bolt through holes 7 ₁ , 17 ₁ ; 7 ₂ , 17 ₂ from the cylinder head 3 side. A plurality of through bolts 38 ₁ and 38 ₂ screwed into blind screw holes 19 ₁ and 19 ₂ formed in a plurality of bearing cap portions 4 B _{1 to} 4 B ₅ of the oil pan 4 are integrally coupled.
[0014]
As shown in FIGS. 1 and 2, four cylinder bores 5 arranged in series and a water jacket 6 surrounding them are formed in the cylinder block 2, and a plurality of the bolt through holes are formed outside the water jacket 6. 7 ₁ and 7 ₂ are provided.
[0015]
Pistons 8 are slidably fitted in the four cylinder bores 5, respectively, and the lower end surface of the cylinder block 2 on the crankcase side and a plurality of bearing cap portions 4B _{1 to} 4B _{5 of the} oil pan body 4 _1. A crankshaft 9 is rotatably supported between them, and a connecting rod 10 is connected between the crankpin of the crankshaft 9 and the piston pin of the piston 8. Further, a valve cam shaft 11 is rotatably supported on the cylinder head 3 and, as usual, the valve cam shaft and the intake and exhaust valves 14 and 15 disposed therebetween are interlocked. A conventionally known valve operating mechanism 16 that opens and closes them at a predetermined timing is provided. A plurality of bolt insertion holes 17 ₁ , 17 ₂ that coincide with the bolt insertion holes 7 ₁ , 7 ₂ on the cylinder block 2 side are provided side by side in the direction of the crankshaft 9. Further, a head cover 18 covering the valve mechanism 16 is fixed to the upper surface of the cylinder head 3 through packing.
[0016]
As shown in FIG. 1, a transmission mechanism 12 is connected between the outer end of the valve camshaft 11 and the outer end of the crankshaft 9. The transmission mechanism 12 is suspended between a drive sprocket 45 secured to the outer end of the crankshaft 9, a driven sprocket 46 secured to the outer end of the valve camshaft 11, and both the sprockets 45, 46. The driving force of the crankshaft 9 is transmitted to the valve camshaft 11 through the transmission mechanism 12 with a reduction ratio of 1/2. Also this transmission mechanism 12 is fixed to the transmission case portion 3 ₁ which is formed integrally at one end of the crankshaft direction of the cylinder head 3, a plurality of connecting bolts 29 to one end surface of the crankshaft direction of the cylinder block 2 It is covered with a transmission case 13. The transmission case 13, the extension portion 13e which is extended downward from the cylinder block 2 is integrally formed, the extension portion 13e has a plurality of bolts to the oil pan main body 4 ₁ of the opening end face 24 to be described later It is secured by 29, and the oil pan main body 4 _1, the oil pan 4 is formed of more engine E and the extension portion 13e of the transmission case 13. As clearly shown in FIGS. 5 and 6, the extension 13 e of the transmission case 13 has a U-shaped longitudinal section and projects outward in the crankshaft direction. Capacity is expanded.
[0017]
Further, as shown in FIG. 6, one end of the crankshaft 9 passes through the shaft hole 50 of the transmission case 13 and protrudes to the outside, and a driving wheel, that is, a driving pulley 48 is fixed to the outer end thereof. The pulley 48 is interlocked with an engine auxiliary machine such as a water pump (not shown) through an endless transmission band 49. An oil seal means 54 is interposed between the crankshaft 9 and the shaft hole 50 of the transmission case 13. In the transmission case 13, another drive sprocket 51 is fixed to the crankshaft 9 adjacent to the drive sprocket 45, and this drive sprocket 51 is a drive sprocket 52 for the oil pump Op provided in the oil pan chamber Co. Are linked to each other through an endless chain 53.
[0018]
The oil pan 4 is its main part, the oil pan body 4 _1, Fe, it is cast in one piece of a metal material such as Al alloy. The oil pan main body 4 _1, intended to be coupled together by connecting bolts 35 to the lower surface of the cylinder block 2, as shown clearly in FIG. 7, the bottom wall 20, left and right side walls 21, 22 and end walls 23 When being more formation, the oil pan body 4 _1, and the one end face of the transmission mechanism 12 side is opened, the opening end face 24, there have plurality of bolt holes 25 are provided, said cylinder One end face 30 (see FIG. 4) of the block 2 is the same plane, and the transmission case 13 is fixed to those faces 24 and 30 by a plurality of connecting bolts 29 via packing. The opening end face 24 of the oil pan main body 4 ₁ as described above is covered by the lower extension portion 13e of the transmission case 13, an oil pan main body 4 _1, by an extension portion 13e of the transmission case 13, of the engine E An oil pan 4 is configured.
[0019]
Wherein the oil pan body 4 in _1, that to exist substantially equal intervals in the crankshaft 9 direction, the crankshaft 9 and a plurality of bearing cap portion 4B ₁ ~4B ₅ in a direction intersecting are formed integrally These bearing cap portions 4B _{1 to} 4B ₅ are all constituted by wall bodies perpendicular to the crankshaft 9, and their left and right side end portions are integrated with the left and right side walls 21 and 22, respectively. Is continuous. Bearing cap portion 4B of the one outermost of the oil pan main body 4 ₁ (Mission mounting side) _5, be integral with the oil pan main body 4 ₁ of the end wall 23, forms a part of the end wall 23 ing. A semicircular lower bearing half 26 is formed in the center of the upper surface of each of the plurality of bearing caps 4B _{1 to} 4B ₅ , and these lower bearing half 26 is formed in the lower part of the cylinder block 2. In cooperation with a plurality of semicircular bearing upper half portions 27 formed integrally with the crankcase portion, a crank bearing hole 28 for rotatably supporting the crankshaft 9 is configured (see FIG. 3).
[0020]
One end of the oil pan body 4 ₁ is opened in the crankshaft direction by the bottom wall 20, the side walls 21 and 22, the end wall 23, and the bottom surfaces of the plurality of bearing cap portions 4B _{1 to} 4B _5. , continuous to the crankshaft direction, it is cave-like oil pan chamber Co is formed, the oil pan chamber Co, when the casting of the oil pan main body 4 ₁ integrally stamped of mold cores etc. shaped as a punching cast by holes, and the inner surface of the oil pan main body 4 ₁ of the bottom wall 20 and the left and right side walls 21 and 22, the bottom surface of the plurality of bearing cap portion 4B ₁ ~4B ₅ is a cross section crossing the crankshaft 9 is formed in the same shape, and the opening of the oil pan main body 4 ₁ type draft which spreads divergent along the opening end surface 24 from the end wall 23 is formed, thereby the lower surface of the oil pan chamber Co end wall 23 End face 24 It is formed on the inclined surface of the headed down slope. Corresponding to the bottom of the oil pan main body 4 ₁ of the opening end face 24, the lowermost end of the extension portion 13e of the transmission case 13, and the boss portion 55 is formed, and the boss portion 55 oil discharge port 56 is opened The oil discharge port 56 is closed by screwing a plug body, that is, a drain bolt 57. Furthermore, since the oil discharge port 56 is provided in the transmission case 13, it is easy to ensure the distance from the ground of the oil pan 4. In particular, since the oil discharge port 56 is formed in the crankshaft direction, the drain bolt 57 does not protrude downward.
[0021]
The oil pan chamber Co can be formed as a tunnel-shaped cast hole in which both end walls in the direction orthogonal to the crankshaft direction are open.
[0022]
Adjacent ones of the plurality of bearing cap portions 4B _{1 to} 4B ₅ are integrally connected in a bridge shape by left and right baffle plates 31 on the left and right sides in the direction orthogonal to the crankshaft 9, respectively. The plate 31 extends in the lateral direction so as to partition a part of the communicating portion between the crank chamber Cc and the oil pan chamber Co in the oil pan 4 and suppresses the ripples of the lubricating oil in the oil pan chamber Co. . Further, in FIG. 7, the baffle plate on the side where the lubricating oil is sprung up by one-way rotation of the crankshaft 9 (FIGS. 2 and 3, the direction of the arrow a), Reinforcing walls 33 projecting toward the chamber Cc side are integrally formed, and these reinforcing walls 33 cooperate with the baffle plate 31 to contribute to securing the rigidity of the bearing cap portions 4B _{2 to} 4B _5. Yes. Further, a pair of rib pieces 34 are integrally formed at both ends of the reinforcing wall 33 in the longitudinal direction, and these rib pieces 34 lubricate the oil pan chamber Co by the rotation of the crankshaft 9. Helps prevent oil splashing.
[0023]
As clearly shown in FIG. 3, in the bearing cap portions 4B _{1 to} 4B ₅ , concave portions 36 and 37 opened on the upper surface are formed on the left and right surfaces of the bearing cap portions 4B _{1 to} 4B ₅ , respectively. screw holes 19 _1, 19 ₂ are formed at their blind screw holes 19 _1, 19 _2, the through bolt 38 is screwed.
[0024]
3, the recess 36 on one side of the crankshaft 9 of the bearing cap portions 4B _{1 to} 4B ₅ forms an oil supply passage 40 in cooperation with the recess 39 on one side on the cylinder block 2 side. The lubricating oil in the oil supply passage 40 is supplied to the engine through an oil passage 43 formed between the bearing of the crank 9 and the bolt through holes 7 ₁ and 17 ₁ on one side of the crankshaft 9 and the through bolt 38 _1. To be lubricated. On the other hand, the concave portion 37 on the other side of the crankshaft of the bearing cap portions 4B _{1 to} 4B ₅ forms a return oil passage 42 communicating with the oil pan chamber Co in cooperation with the other concave portion 41 on the cylinder block 2 side. The return oil passage 42 communicates with the bolt passage holes 7 ₂ , 17 ₂ on the other side of the crankshaft 9 and an oil passage 44 between the passage bolts 38 _2, and the oil after lubrication is supplied to the oil pan chamber. Lead to Co.
[0025]
On the attachment side of the intake system member In of the engine body 1, an outer surface of the boundary wall portion between the bearing cap portions 4B _{1 to} 4B ₅ and the oil pan chamber Co of the oil pan 4 is spaced in the direction of the crankshaft 9. A plurality of thick boss-like attachment portions 61 are integrally formed outward, and the lower portion of the intake manifold as the intake system member In is attached to these attachment portions 61 by a fixing tool 62 such as a bolt. It is fixed. The intake system member In may be a throttle body, an intake duct, an intake chamber, an air cleaner, or the like in addition to the intake manifold.
[0026]
In the drawing, Fu is a fuel supply unit having a fuel injection nozzle attached to the intake system member In, and Ex is an exhaust system assembly attached to the other side of the engine body 1.
[0027]
According to the rotation of the crankshaft 9 by the operation of the wet sump engine E, the valve camshaft 11 is driven via the transmission mechanism 12 to operate the valve mechanism 16, and the drive pulley 48 is driven to drive endless transmission. An engine accessory such as a water pump is driven through the belt 49, and the oil pump Op is driven through the drive sprocket 51, chain 53 and sprocket 52, and the lubricating oil in the oil pan chamber Co is sucked up. Thus, forced lubrication is applied to each lubricated part of the engine E.
[0028]
By the way, in this engine E, a part of the oil pan 4 is configured using the extension 13e of the transmission case 13 that covers the transmission mechanism 12, so that the oil pan body 4 ₁ that is fixed to the lower surface of the cylinder block 2 is used. It is possible to provide an oil pan 4 that can secure a necessary and sufficient amount of lubricating oil while reducing the size of itself. Further, the extension 13e of the transmission case 13 that is a part of the oil pan 4 is formed to project outward so as to occupy the dead space below the drive pulley 48, so that the dead space can be used effectively. As shown in FIG. 5, the extension 13e of the transmission case 13 covers the lower portion of the drive pulley 48, and the drive pulley 48 and the transmission band 49 are not enlarged. It also contributes to protection. In particular, since the extension portion 13e projects outward beyond the width of the drive pulley 48 in the crankshaft direction, the drive pulley 48 and the transmission band 49 are excellently protected.
[0029]
The oil pan main body 4 ₁ is stamped and formed casting by stamping the mold core or the like, thereby the bottom surface of the oil pan chamber Co is formed on the inclined surface of the downward gradient toward the open end face 24, moreover By providing the oil discharge port 56 at the lowermost part of the extension 13e of the transmission case 13, not only the lubricating oil in the oil pan 4 can be easily removed, but also the lubricating oil remains in the oil pan 4. It will never be. Further, when the oil discharge port 56 is opened in the extension portion 13e of the transmission case 13, the boss portion 55 is formed there, thereby increasing the rigidity of the transmission case 13 itself.
[0030]
Furthermore the oil pump Op can be assembled therein through the open end face 24 of the oil pan main body 4 _1, workability is improved with the set. In particular, since the oil pump Op is attached to a bottom surface of the opening end surface 24 side of the oil pan main body 4 in _1, good assemblability.
[0031]
The cylinder block 2, to couple the oil pan 4 together, a plurality of through bolts 38 _1, 38 ₂ from the cylinder block 2 side, to the oil pan main body 4 ₁ of the bearing cap portion 4B ₁ ~4B ₅ since done by screwing, to the lower surface thereof bearing cap portion 4B ₁ ~4B _5, there is no portion protruding downward, thereby the time for casting the oil pan main body 4 _1, wherein the bearing cap portion 4B ₁ ~ under the 4B _5, those of the oil pan chamber Co consecutive parallel direction, can be stamped and formed casting at once by stamping the mold core or the like to the crankshaft 9 direction, said oil pan main body 4 ₁ Especially, the molding of the oil pan chamber Co becomes easy, and not only the molding cost can be reduced, but also contributes to the weight reduction of the oil pan 4 itself. Capacity securing Irupan chamber Co is easily allows also reduction in size of the oil pan 4 itself.
[0032]
Further, since it is not necessary to open mounting holes such as bolt holes in the oil pan 4, a sealing means for preventing leakage of lubricating oil is unnecessary, and the number of parts can be reduced. The necessary rigidity of itself is ensured.
[0033]
As mentioned above, although one Example of this invention was described, this invention is not limited to the Example, A various Example is possible within the scope of the present invention. For example, in the above-described embodiment, the case where the present invention is applied to a four-cylinder inline engine has been described. However, the present invention can also be applied to other types of single-cylinder or multi-cylinder engines. In the embodiment, a chain transmission mechanism is employed as a transmission mechanism for interlocking the crankshaft and the valve camshaft. However, a gear transmission mechanism, a belt transmission mechanism, and other transmission mechanisms may be employed instead. In the above embodiment, the inclined surface of the bottom surface of the oil pan body, which is inclined downward toward the opening end surface, is formed by punching the mold, and this can be performed by other known forming means during the casting of the oil pan body. It may be formed.
[0034]
【The invention's effect】
As described above, according to the invention of each claim, since the oil pan is constituted by the downward extension portion of the transmission case and the oil pan body, a part (extension portion) of the transmission case is a part of the oil pan. As the oil pan body can be made smaller, the necessary and sufficient amount of lubricating oil can be secured in the oil pan, which is sufficient to lubricate each lubricated part of the engine. The amount of lubricating oil can be secured and the temperature rise of the oil can be suppressed. In addition, the extension portion of the transmission case is located below the drive pulley for driving the auxiliary equipment fixed to the end of the crankshaft on the outer side of the transmission case, and has a U-shaped longitudinal section. Since the drive pulley for driving the auxiliary machinery extends beyond the crankshaft direction outward, the capacity of the oil pan chamber in the oil pan is expanded by the extension of the transmission case, The amount of lubricating oil can be further increased, and the extension portion is formed to project outward so as to occupy the dead space below the drive pulley. Since the lower part is covered , the dead space can be used effectively, the engine itself is not enlarged, and the drive pulley and the transmission band are further protected.
[0035]
According particularly to the third aspect of the invention, assembly of O Iruponpu it is good, improves its assembling workability.
[Brief description of the drawings]
FIG. 1 is a partially broken side view of an engine. FIG. 2 is a partially broken front view of an engine. FIG. 3 is a longitudinal sectional view of the engine along the line 3-3 in FIG. 4 is a partial side view of the engine along line 4. FIG. 5 is a partially enlarged view along line 5-5 in FIG. 1. FIG. 6 is a sectional view along line 6-6 in FIG. [Explanation of symbols]
2 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Cylinder block 4 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Cylinder head integrated oil pan 4 ₁・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Oil pan body ………… Crankshaft 11 …… Valve camshaft 12 ・ ・ ・ ・ ・ Transmission mechanism 13 ・ ・ ・ ・ ・ ・ ・ ・・ Transmission case 13e ・ ・ ・ ・ ・ ・ ・ ・ Extension part (of transmission case)
24 …… Open end face (of oil pan body)
48 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Driving pulley for driving auxiliary equipment Op ・ ・ ・ ・ ・ ・ ・ ・ Oil pump

Claims (3)

A timing transmission mechanism (12) for transmitting the driving force of the crankshaft (9) to the valve operating camshaft (11) is provided on one end surface of the cylinder block (2) in the crankshaft direction. In an engine in which (12) is covered with a transmission case (13),
An oil pan body (4 ₁ ) whose one end surface in the crankshaft direction is opened is fixed to the lower surface of the cylinder block (2), while the transmission case (13) is fixed to the lower surface of the cylinder block (2). An extension portion (13e) extending downward is integrally formed, and the extension portion (13e) is fixed to the opening end surface (24) of the oil pan body (4 ₁ ) to extend the extension portion of the transmission case (13). (13e) and the oil pan body (4 ₁ ) constitute an oil pan (4), and the extension part (13e) of the transmission case (13) is located outside the transmission case (13) of the crankshaft (9). The auxiliary drive pulley (48) is fixed to the end of the auxiliary drive pulley (48) and has a U-shaped vertical cross section. overhangs crankshaft outwardly beyond the width Cage, characterized in that the lower part of the auxiliary device driving the drive pulley (48) is covered by its projecting portion, the oil pan structure in the engine. The upper side wall of the projecting portion having a U-shaped longitudinal section is curved along the outer periphery of the lower part of the accessory driving drive pulley (48), and the lower part of the accessory driving drive pulley (48) is 2. The oil pan structure for an engine according to claim 1, wherein the oil pan structure is covered along an outer periphery of the lower portion thereof. Said oil pan body (4 ₁₎ therein enabling assembly of the oil pump through the open end (24) of (Op), characterized in that to face the inner space of the protruding portion, to claim 1 or 2 Oil pan structure for the described engine.

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