JP5162507B2 - Oil cooler mounting structure and V-type engine provided with the same - Google Patents

Description

  The present invention relates to an oil cooler mounting structure for an internal combustion engine and a V-type engine having the oil cooler mounting structure.

  Generally, in an internal combustion engine, engine oil stored in an oil pan is pumped up by an engine pump, supplied to each sliding portion such as a crankshaft and a camshaft, and used for lubrication and cooling. It is dripped in and recycled. When the engine temperature rises, the temperature of the engine oil also rises, and an oil cooler may be interposed in the oil passage of the engine oil in order to keep the oil temperature appropriate. Until now, this oil cooler has often been sandwiched between the oil filter and its mounting parts, and this arrangement eliminates the need for external piping for the oil passage, resulting in damage in the event of an accident. The risk of engine oil leakage was reduced.

  Incidentally, an oil strainer is provided in the oil pan in order to collect foreign matters contained in the engine oil. The oil strainer is provided with a suction port for sucking engine oil in the oil pan, and this suction port is arranged in the vicinity of the bottom surface of the oil pan so as not to suck air while the engine is driven.

  However, in an engine mounted on an automobile, acceleration in the horizontal direction occurs due to acceleration, deceleration, turning, etc., so the engine oil level in the oil pan is not kept horizontal, and air flows from the engine oil suction port. There are things to do. In order to prevent the air from flowing into the engine oil passage in this way, in the vehicle four-cycle engine, a deep bottom portion in which the oil strainer is disposed at the center portion in the crankshaft direction of the oil pan is formed. There is known a technique in which shallow bottom portions are formed on both ends in the crankshaft direction and an oil sump portion that is shallower than the deep bottom portion is provided on at least one of the deep bottom portions perpendicular to the crankshaft (Patent Literature). 1).

Japanese Patent No. 3557446

  However, if the oil cooler cannot be installed in the vicinity of the oil filter due to the in-vehicle layout of the engine, an external piping must be provided to secure an oil passage through the oil cooler. If it increases, the risk of oil leaks in the event of an accident increases. In addition, it is conceivable that not only the external piping but also the oil cooler itself may cause oil leakage, so the installation position of the oil cooler needs to be determined in consideration of the risk of damage.

  The present invention has been devised to solve such problems imposed on the prior art, and the main object of the present invention is to properly arrange an oil cooler and an oil passage that passes through the oil cooler. An object of the present invention is to provide an oil cooler mounting structure capable of suppressing leakage.

In order to solve such a problem, according to the present invention, in an oil cooler (13) mounting structure for an internal combustion engine (E), the internal combustion engine (E) has an oil pan (2) below the cylinder block (1). The transmission (7) is attached to one end side of the oil pan (2) in the direction of the crankshaft (6), and the oil pan (2) has the suction port (14a) of the strainer (14) opened therein. And a shallow bottom portion (2c) formed between the deep bottom portion (2a) and the transmission (7), and an oil cooler (13) is attached below the shallow bottom portion (2c). It has been .

According to this configuration , the oil cooler is mounted below the shallow bottom of the oil pan, so that the space efficiency of the engine room is improved, and the oil cooler is surrounded from both sides in the crankshaft direction by the transmission and the deep bottom of the oil pan. Therefore, the risk of breakage during an accident or driving on a rough road is reduced. Further, since the oil cooler is disposed below the oil pan, it is possible to obtain a cooling effect by the traveling wind.

In the mounting structure of the oil cooler (13) configured as described above, the oil passage connecting the suction port (14a) of the strainer (14) and the oil cooler (13) is connected to the bottom wall of the shallow bottom portion (2c). It is characterized by penetrating.

  According to the present invention, the oil passage leading to the oil cooler attached below the shallow bottom portion passes through the bottom wall of the shallow bottom portion, that is, at least a part of the oil passage is disposed through the oil pan. This eliminates or shortens the outer turning pipe, and can prevent the oil passage from being damaged. In addition, there is a major failure such as an engine failure due to a decrease in the amount of oil due to the elimination of the outer piping and the return of oil to the oil pan even if the oil passage arranged in the oil pan is damaged. The risk of being connected to is reduced. Further, since the oil passage is disposed through the oil pan, the oil passage length can be shortened as compared with the external rotation pipe.

The present invention also has a pair of banks (1bl, 1br) in which the respective cylinder bores (1cl, 1cr) are offset from each other in the direction of the crankshaft (6), and the crankshaft (6b) between the pair of banks (1b). ) V-type engine (E) in which a main gallery (8) extending in the direction is formed, is installed below the cylinder block (1), and is connected to the transmission (7) at one end in the direction of the crankshaft (6). And a deep bottom portion (2a) provided with a suction port (14a) of the strainer (14), and a shallow bottom portion (2c) formed between the deep bottom portion (2a) and the transmission (7). An oil pan (2), an oil passage that connects the suction port (14a) of the strainer (14) and the main gallery (8), and is attached to the bottom of the shallow bottom (2c). The oil passage has a portion where the suction port (14a) of the strainer (14) and the oil cooler (13) communicate with each other, penetrates the bottom wall of the shallow bottom portion (2c), and the oil cooler ( 13) and the main gallery (8) communicate with each other through a space formed at the end of one bank (1bl) by offset.

According to the present invention, in addition to the effect of the invention related to the mounting structure of the oil cooler (13), the oil passage that connects the oil cooler and the main gallery passes through the space formed by the offset, so that the external rotation pipe The oil passage can be further prevented from being damaged by eliminating or shortening the length.

As described above, according to the present invention, the oil cooler is disposed so as to be surrounded by the transmission and the deep bottom portion of the oil pan, thereby suppressing oil leakage of the oil cooler and improving the space efficiency of the engine room. Oil leakage in the oil passage can be suppressed by passing the passing oil passage through the oil pan, penetrating the bottom wall of the shallow bottom portion, and suppressing the outer turning pipe.

It is a principal part side view of the motor vehicle carrying the V-type engine to which this invention was applied. FIG. 2 is a side view of the V-type engine shown in FIG. 1 with a cylinder head and the like omitted. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is IV-IV sectional drawing in FIG. It is a perspective view of an oil cooler attachment member. FIG. 2 is a front bottom view of the automobile shown in FIG. 1.

  Hereinafter, the present invention will be described in detail with reference to an embodiment shown in the accompanying drawings. In the description of each member, when the direction is indicated, the upper and lower sides are determined in the state where the engine is arranged as shown in FIG.

  As shown in FIG. 1, a FR (front engine / rear drive) type vehicle V is equipped with a four-cycle V-type six-cylinder engine (hereinafter simply referred to as engine E) to which the present invention is applied. The engine E includes a cylinder block 1 having a pair of cylinder banks 1bl and 1br (see FIG. 4) having a narrow angle of 90 degrees, an oil pan 2 joined to the lower surface of the cylinder block 1, A cylinder head 3 joined to each upper surface of both cylinder banks, a cylinder head cover 4 covering a camshaft (not shown) provided in a pair above each cylinder head 3, and between both cylinder heads 3, that is, both cylinder banks 1b It consists of a throttle body 5 installed between them.

  The engine E is vertically installed, and a crankshaft 6 (see FIG. 4) rotatably supported through a bearing extends in the front and rear direction inside the cylinder block 1. An automatic transmission 7 (hereinafter abbreviated as AT7) connected to the cylinder block 1 and the oil pan 2 are joined to the rear end surfaces.

  The oil pan 2 includes a deep bottom portion 2a formed at an intermediate portion in the crankshaft direction, a front shallow bottom portion 2b formed in front of the deep bottom portion 2a, and a rear shallow bottom portion 2c formed behind the deep bottom portion 2a. It has. In addition, the front shallow bottom part 2b and the rear shallow bottom part 2c are formed shallow in comparison with the deep bottom part 2a, that is, are arranged at positions where the bottom surface is high. Further, the front shallow bottom portion 2b is provided with a steering gear box 9 that slidably holds the steering rack below the front shallow bottom portion 2b, and is formed shallower than the rear shallow bottom portion 2c.

  An under cover 10 attached to the vehicle body is disposed below the engine E so as to accommodate the steering gear box 9 between the oil pan 2 and the front shallow bottom portion 2b of the oil pan 2. The under cover 10 protects the engine E and accessories in the engine room from stepping stones.

  As shown in FIG. 2, the left bank 1bl of the cylinder block 1 has three cylinder bores 1cl arranged in the front-rear direction. Two cylinder bores 1cr are formed at positions offset rearward from the cylinder bores 1cl of the left bank 1bl (see also FIG. 4).

  A trochoid oil pump 11 driven by rotation of the crankshaft 6 is attached to the front surface of the cylinder block 1, and an oil filter 12 connected to the lower surface of the oil pump 11 is attached to the front end of the oil pan 2. The engine oil cooler 13 is attached below the rear shallow bottom portion 2 c of the oil pan 2 via an oil cooler attachment member 20. The engine oil cooler 13 functions as a cooler that lowers the temperature of the engine oil that is supplied to each sliding portion of the engine E and heats it by exchanging heat with the cooling water flowing inside. It also functions as a warmer that raises the temperature of the engine oil, which is at a low temperature, when the engine is started during the season.

  As shown in FIG. 3, an oil strainer 14 that collects foreign matters contained in the engine oil is disposed on the deep bottom 2 a of the oil pan 2. The oil strainer 14 is provided with a suction port 14a for sucking engine oil at the lowermost portion thereof, and the suction port 14a is disposed so as to open near the bottom surface at the approximate center of the deep bottom portion 2a. With this arrangement, air does not flow into the oil strainer 14 from the suction port 14a even when the vehicle V is accelerated or decelerated or turns.

  Further, the upper end surface of the oil pan 2 has a substantially rectangular shape as indicated by hatching in FIG. 3, but the deep bottom portion 2a has a bulging portion 2d extending to the left and right. As described above, the oil pan 2 having the bulging portion 2d prevents the oil level in the oil pan 2 from becoming excessively high even if both shallow bottom portions 2b and 2c are formed on the front and rear sides. An increase in the amount of engine oil that can be stored without hindering the driving of the engine E is attempted.

  The upstream end of the first oil pipe 16 is connected to an opening formed at the upper end of the oil strainer 14 via a mounting flange 16a. The first oil pipe 16 extends in the front-rear direction and has a downstream end connected to the suction port of the oil pump 11 to form an oil passage that supplies engine oil sucked from the oil strainer 14 to the oil pump 11. . An oil passage that penetrates through the front wall of the oil pan 2 to the oil filter 12 is formed on the discharge port side of the oil pump 11, and the entire flow of engine oil discharged from the oil pump 11 is transferred by the oil filter 12. Filtered. An oil passage is integrally formed on the downstream side of the oil filter 12, and a downstream end of the oil passage is connected to a through hole (not shown) formed on the front surface of the oil pan 2. On the other hand, the upstream end of the second oil pipe 17 is connected to the inside of the oil pan 2 of the through hole via a mounting flange 17a. The second oil pipe 17 extends in the front-rear direction, and its downstream portion is curved downward (see FIG. 2), and its downstream end is formed on the bottom wall of the rear shallow bottom portion 2c of the oil pan 2 (not shown). It connects to a through-hole via the attachment flange 17b.

  Further, a through hole (not shown) formed in the bottom wall of the rear shallow bottom portion 2c is formed in the vicinity of the through hole to which the second oil pipe 17 is connected, and a third oil extending in the vertical direction is formed. The lower end of the pipe 18 is connected to the upper side of the through hole via a mounting flange 18a. Although details will be described later, the third oil pipe 18 constitutes a part of an oil passage from the engine oil cooler 13 to a main gallery 8 described later.

  By the way, a crank formed as a through hole in order to provide a crank angle sensor for detecting the rotation angle of the crankshaft 6 in the right portion of the rear shallow bottom portion 2c where the second oil pipe 17 and the third oil pipe 18 are not disposed. An angle sensor mounting portion 2e is disposed. In the vicinity of the crank angle sensor mounting portion 2e, an oil scattering prevention wall 2f that rises substantially vertically from the bottom wall is formed. By forming this oil scattering prevention wall 2f, it is possible to prevent a large amount of engine oil that has been dripped and scattered after lubricating each part and engine oil that has been stirred and scattered by the connecting rod from falling on the crank angle sensor. Further, even if the engine oil moves backward due to sudden acceleration, the engine oil is hardly covered by the crank angle sensor. Further, by disposing an AT oil cooler 31 described later below the crank angle sensor mounting portion 2e, the crank angle sensor is prevented from being damaged by a stepping stone or the like.

  As shown in FIGS. 4 and 5, the oil cooler mounting member 20 has a rectangular shape that is long in the left-right direction, and the lower surface of the oil cooler mounting member 20 is used for the lubrication and operation of the AT 7 in addition to the engine oil cooler 13. (Automatic Transmission) An AT oil cooler 31 for cooling the oil is attached. The engine oil cooler 13 and the AT oil cooler 31 have the same shape, and are arranged symmetrically about a vertical plane passing through the crank axis of the engine E.

  As shown in FIG. 5, mounting bosses 21 for bolting the oil pan 2 are provided at the four corners and the center of the oil cooler mounting member 20. Further, two pipe portions 22 and 23 projecting upward are formed in the upper portion of the engine oil cooler 13 on the upper surface of the oil cooler mounting member 20. One piping part 22 is an inflow path to the engine oil cooler 13, and the other piping part 23 is an outflow path from the engine oil cooler 13.

  An annular groove 24 is formed on the upper surface of each of the pipe portions 22, 23. With the seal member inserted in the annular groove 24, the oil cooler attachment member 20 is connected to the oil pan 2 via the attachment boss 21. By joining to the lower surface of the rear shallow bottom part 2c, the piping part 22 is connected to the opening to which the second oil pipe 17 is connected, and the piping part 23 is connected to the opening to which the third oil pipe 18 is connected. The That is, an oil passage that communicates between the oil filter 12 and the engine oil cooler 13 cuts through the inside of the oil pan 2 and then passes through the bottom wall of the rear shallow bottom portion 2 c to communicate the engine oil cooler 13 and the main gallery 8. Similarly, the oil passage penetrates the bottom wall of the rear shallow bottom portion 2c.

  On the other hand, in the upper part of the AT oil cooler 31 on the upper surface of the oil cooler mounting member 20, two flanges projecting upward smaller than the pipe portions 22 and 23 and communicating with the AT oil cooler 31 are respectively opened on the upper surface. Portions 25 and 26 are formed. One flange portion 25 is an inflow passage to the AT oil cooler 31, and the other flange portion 26 is an outflow passage from the AT oil cooler 31. AT oil pipes 32 and 33 communicating with AT7 are connected to both flange portions 25 and 26 via mounting flanges 32a and 33a, respectively.

  Furthermore, on the upper surface of the oil cooler mounting member 20, an inflow cooling water connection portion 27 that is connected to the cooling water pipe 29 and allows cooling water to flow in, and a cooling water pipe 30 that is connected to the cooling water pipe 30 and flows out the cooling water. An outflow cooling water connection 28 is provided. Only one pair of the inflow cooling water connection portion 27 and the outflow cooling water connection portion 28 is provided, and the cooling water flowing in from the inflow cooling water connection portion 27 is used for cooling the engine oil by the engine oil cooler 13. The oil flows into the AT oil cooler 31 and is used for cooling the AT oil. As described above, the engine oil cooler 13 and the AT oil cooler 31 are attached to one oil cooler mounting member 20 and arranged close to each other, so that the piping length of the cooling water is longer than that in the case where the two are arranged at a distance. Has been shortened.

  As shown in FIGS. 1, 2, and 4, the cooling water pipe 29 connected to the inflow cooling water connecting portion 27 is arranged to extend vertically on the left side of the cylinder block 1, and its upstream end is The cylinder block 1 is connected to the left side surface via a mounting flange 29a. Then, the cooling water flowing through the water jacket 1 d formed inside the cylinder block 1 flows into the cooling water pipe 29 and is supplied to the engine oil cooler 13. On the other hand, the cooling water pipe 30 connected to the outflow cooling water connection portion 28 is routed rearward from the left side of the cylinder block 1 and extended upward, and then forwards between the pair of cylinder banks 1b. It extends and is connected to a water pump (not shown) provided at the front of the engine E.

  As shown in FIGS. 1 and 6, the under cover 10 disposed below the engine E extends to a position where the rear end thereof overlaps with the deep bottom portion 2a of the oil pan 2 in a plan view. Most of the oil coolers 13 and 31 are exposed. Therefore, the traveling wind strikes the deep bottom portion 2a and both oil coolers 13 and 31, and the deep bottom portion 2a and both oil coolers 13 and 31 are also cooled by the traveling wind, so that the cooling effect of the engine oil is enhanced.

  As shown in FIG. 4, a main gallery 8 is formed above the crankshaft 6 in the cylinder block 1, that is, between the pair of left and right banks 1b. The main gallery 8 extends in parallel with the crankshaft 6, and is connected to the journal portion of the crankshaft 6, the oil jet portion for the piston sliding in the left and right cylinder bores 1cl, 1cr, and the left and right cylinder heads 3l, 3r. Distributes engine oil to the camshaft provided. As shown in FIG. 2, a cylinder block oil passage 19 is formed in the cylinder block 1 to communicate the downstream end (upper end) of the third oil pipe 18 with the main gallery 8. The oil passage 19 in the cylinder block includes a lower vertical portion 19a that extends in a substantially vertical direction and an upper inclined portion 19b that is bent from the upper end of the lower vertical portion 19a and extends obliquely. As shown in FIG. 2, the oil passage 19 in the cylinder block is disposed so as to pass through a space formed at the rear end portion of the left bank 1bl formed by the cylinder bore 1cl being offset forward from the cylinder bore 1cr. Is done.

  Thus, the oil coolers 13 and 31 are attached below the rear shallow bottom portion 2c of the oil pan 2, so that the space efficiency of the engine room is improved. Further, since both the oil coolers 13 and 31 are surrounded by the AT 7 and the deep bottom portion 2a of the oil pan 2 from the front and rear direction, the risk of breakage during an accident or traveling on a rough road is reduced.

  The oil path from the oil strainer 14 to the engine oil cooler 13 passes through the outside of the oil pan 2 because the oil filter 12 is interposed between the oil pump 11 and the engine oil cooler 13. Most of the oil passes through the inside of the oil pan 2 and penetrates the bottom wall of the rear shallow bottom portion 2c, so that the outer turning pipe portion is shortened and the oil passage is prevented from being damaged. If the oil filter 12 is disposed downstream of the engine oil cooler 13, the entire oil path from the oil strainer 14 to the engine oil cooler 13 can be passed through the oil pan 2. In this way, not only does the oil passage not be exposed to the outside, but also through the oil pan 2, even if the oil pipe breaks and the engine oil leaks or leaks due to poor connection, the leaked engine oil is oil Since it returns to the inside of the pan 2, the risk of a major failure such as a failure of the engine E due to a decrease in the amount of oil is reduced.

  Further, since the oil passage communicating the engine oil cooler 13 and the main gallery 8 passes through the space formed by the offset of the cylinder bores 1cl and 1cr, the outer turning pipe is eliminated and the oil passage is prevented from being damaged. The path length is shortened and the decrease in hydraulic pressure is suppressed.

  Although the description of the specific embodiment is finished as described above, the present invention is not limited to the above embodiment and can be widely modified. For example, in the above-described embodiment, the present invention is applied to an FR automobile, but may be applied to a four-wheel drive vehicle, an MR (Midship engine Rear drive) vehicle, and an RR (Rear engine Rear drive) vehicle. In addition, the specific configuration and arrangement of each device can be changed as appropriate without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Cylinder block 1bl, 1br Bank 1cl, 1cr Cylinder bore 2 Oil pan 2a Deep bottom part 2b Front shallow bottom part 2c Rear shallow bottom part 2d Expansion part 3 Cylinder head 6 Crankshaft 8 Main gallery 11 Oil pump 12 Oil filter 13 Engine oil cooler 14 Oil strainer 14a Suction port 19 Oil passage in cylinder block 20 Oil cooler mounting member 31 AT oil cooler E Engine V Automobile

Claims (2)

An oil cooler mounting structure for an internal combustion engine,
In the internal combustion engine, an oil pan is disposed below the cylinder block, and a transmission is attached to one end of the oil pan in the crankshaft direction.
The oil pan has a deep bottom portion in which a suction port of a strainer opens, and a shallow bottom portion formed between the deep bottom portion and the transmission,
The oil cooler is attached below the shallow bottom ,
An oil cooler mounting structure, wherein an oil passage communicating the suction port of the strainer and the oil cooler passes through a bottom wall of the shallow bottom portion . Each cylinder bore has a pair of banks offset from each other in the crankshaft direction, and a V-type engine in which a main gallery extending in the crankshaft direction is formed between the pair of banks,
A transmission is attached to one end side in the crankshaft direction, installed below the cylinder block, and a deep bottom portion where a strainer suction port is provided, and a shallow bottom portion formed between the deep bottom portion and the transmission. Having an oil pan,
An oil cooler that is interposed in an oil passage that communicates the suction port of the strainer and the main gallery, and is attached below the shallow bottom;
The oil passage has a portion where the suction port of the strainer and the oil cooler communicate with each other through the bottom wall of the shallow bottom portion, and a portion where the oil cooler and the main gallery communicate with each other due to the offset. A V-type engine characterized by passing through a space formed at an end.

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