JPH08135426A - Water oil heat exchanging device of engine - Google Patents

Abstract

PURPOSE: To carry out favourable heat exchange between cooling water and oil, to improve rigidity, etc., and to simplify a device. CONSTITUTION: A water jacket 12 of a cylinder block 11 is formed in a shallow bottom shape to a portion roughly equivalent to a piston ring position at the time when a piston is at a bottom dead center in an engine furnished with a cooling device provided with a circulation route to circulate cooling water of a water jet through a water pump and a lubricating device to lead oil from an oil pump to each of sliding parts, etc. Additionally, a water passage 22 to pass cooling water in the cylinder bank direction is formed below the water jacket 12, and an oil passage 36 of the lubricating device is adjacent to this water passage 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchange device for cooling water of an engine cooling device and oil of a lubricating device.

[0002]

2. Description of the Related Art As an engine cooling device, for example, FIG.
There is one as shown in 3. The cooling water from the water pump 1 flows through the water jackets 4 and 5 of the cylinder block 2 and the cylinder head 3, and passes through the radiator from the outlets 7 and 8 or bypasses the radiator according to the opening and closing of the thermostat 6, and the water pump 1 The circuit is circulating back to the entrance.

On the other hand, as a lubricating device for an engine, there is a device that sucks up oil in an oil pan and sends it to each sliding part. As shown in FIG. 34, the oil is immediately below the water jacket 4 of the cylinder block 2. The oil gallery 9 that guides is running. The oil exchanges heat with the cooling water of the water jacket 4 when passing through the oil gallery 9, and maintains an appropriate oil temperature even when the engine is hot (Japan Society of Automotive Engineers, December 1, 1990). (Refer to Volume 1, etc. of the Automotive Technology Handbook issued).

[0004]

In recent years, it has been considered to make the water jacket shallow in order to reduce the friction of the engine. This is because the water jacket of the cylinder block has a shallow bottom shape up to the cylinder volume part, that is, a portion approximately corresponding to the piston ring position when the piston is at the bottom dead center, so that the cylinder wall temperature is maintained high and friction is increased. It reduces.

However, in this case, the water jacket is separated from the lower oil gallery, and heat exchange between the cooling water of the water jacket and the oil in the oil gallery cannot be expected.

In this case, when the engine temperature is low immediately after starting, the increase in the oil temperature is delayed and the friction is increased, and when the engine temperature is high, such as during high-speed operation, the oil temperature (equilibrium oil temperature) becomes excessive. Could rise to.

If the water jacket is made shallow, it affects the rigidity of the cylinder block. As the structural wall of the cylinder block decreases, the rigidity and the like decrease.

The oil from the oil pump is sent through an oil filter or the like, but if the oil filter or the like is not arranged properly, it will be difficult to connect the oil to the oil gallery or the like of the cylinder block.

An object of the present invention is to enable good heat exchange between cooling water and oil, improve rigidity and simplify the structure.

[0010]

A first aspect of the present invention is to provide a cooling device provided with a circulation path for circulating cooling water of a water jacket through a water pump, and to guide oil from an oil pump to each sliding portion or the like. In an engine equipped with a lubrication device, a water jacket of a cylinder block is formed in a shallow bottom shape up to a portion substantially corresponding to a piston ring position when a piston is at bottom dead center, and a cylinder row direction is formed below the water jacket. A water passage for passing cooling water is formed adjacent to the oil passage of the lubricating device.

In a second aspect, the water passage in the first aspect is a bypass passage for a radiator provided in a circulation passage of a cooling device.

In a third aspect of the invention, a part of the cooling water flows in the bypass passage in the second aspect even when the thermostat opens the radiator passage.

In a fourth invention, the water passage in the first invention is an inlet passage for a radiator provided in a circulation passage of a cooling device.

In a fifth aspect of the present invention, the water passage in the first aspect is an outlet passage of a radiator provided in the circulation passage of the cooling device.

According to a sixth aspect of the present invention, the oil passage in the first aspect is a passage for guiding the oil from the oil pump to the bearing portion of the crankshaft.

In a seventh aspect of the invention, the downstream side of the oil passage in the first and sixth aspects is connected to the suction side of the oil pump via a relief valve.

An eighth invention provides a control valve for controlling an oil flow rate at an inlet portion of the oil passage in the first and sixth inventions, and a downstream side of the oil passage is connected to a suction side of an oil pump via a relief valve. Connect

In a ninth aspect, the water passage in the first aspect is provided outside the engine with respect to the oil passage.

In a tenth aspect, the water passage in the first aspect is provided near the skirt start point of the cylinder block.

In an eleventh aspect of the invention, the water passage in the first aspect has a cross-sectional shape that extends from near the skirt start point of the cylinder block to near the skirt center.

In a twelfth invention, the water passage in the first invention is formed by casting, and the oil passage is formed by drilling.

In a thirteenth invention, one or more communication passages connecting the water passage in the first invention and the water outlet of the cylinder head are formed, and an outer wall of the communication passage forms a longitudinal rib of the cylinder block. The outer wall of the water passage forms the lateral rib of the cylinder block.

In a fourteenth invention, the communication passage in the thirteenth invention is formed between the cylinder bores.

In a fifteenth invention, the control valve of the eighth invention is built in the engine front cover, and an oil filter mounting flange is formed in the engine front cover.

A sixteenth invention is the fifteenth invention, wherein
An oil passage from the oil pump to the oil filter and control valve is formed in the engine front cover.

In a seventeenth invention, the control valve in the eighth invention is built in the oil pan or its ladder frame, and the mounting flange of the oil filter is formed in the oil pan or its ladder frame.

An eighteenth invention is the seventeenth invention, wherein
An oil passage connecting at least the oil filter and the control valve is formed in the oil pan or its ladder frame.

[0028]

In the first aspect of the invention, since the water passage is formed below the shallow water jacket and adjacent to the oil passage of the lubricating device, heat exchange with the cooling water in the water passage occurs when the oil passes through the oil passage. Done.

In the second aspect of the invention, cooling water that bypasses the radiator is passed through the water passage. Therefore, as the water temperature of the water jacket rises when the engine temperature is low, the oil temperature rises rapidly.

In this case, as in the third aspect of the present invention, a part of the cooling water is allowed to flow even when the thermostat opens the radiator passage in the water passage, so that the temperature of the oil rises when the engine temperature is high. It can be suppressed.

In the fourth aspect of the invention, the cooling water flowing toward the radiator flows through the water passage. The heat of the oil is exchanged by the cooling water to the radiator, and the oil is maintained at a predetermined temperature when the engine temperature is high.

In the fifth aspect of the invention, the cooling water passing through the radiator is caused to flow through the water passage. Therefore, the heat of the oil is exchanged by the cooling water of a predetermined low temperature, and the oil is maintained at the predetermined temperature when the engine is hot.

In the sixth aspect, the oil sent from the oil pump to the bearing portion of the crankshaft is heat-exchanged with the cooling water in the water passage.

When the downstream side of the oil passage is connected to the suction side of the oil pump through the relief valve as in the seventh aspect of the invention, it becomes possible to pass the required amount of oil through the oil passage, which is good for cooling water. A good heat exchange is obtained.

As in the eighth aspect of the invention, when a control valve for controlling the flow rate of oil is provided at the inlet of the oil passage and the downstream side of the oil passage is connected to the suction side of the oil pump through the relief valve, each sliding movement occurs. A required amount of oil can be passed through the oil passage while supplying a predetermined amount of oil to the section, and heat exchange with cooling water as required can be obtained.

In the ninth aspect, since the water passage is provided on the outer side of the engine with respect to the oil passage, the passage can be easily formed from the oil passage to the bearing portion of the crankshaft.

In the tenth aspect of the invention, since the water passage is provided near the skirt starting point of the cylinder block, it is possible to prevent a decrease in rigidity near the skirt starting point when the water jacket is shallow.

In the eleventh aspect of the invention, since the water passage is formed in a cross section that extends from near the skirt start point of the cylinder block to near the center of the skirt, heat exchange with the flow of oil along the inner wall of the crankcase can also be performed.

In the twelfth aspect, since the water passage is formed by casting and the oil passage is formed by drilling, the productivity is good and both passages can be formed adjacent to each other.

In the thirteenth aspect of the invention, since the outer walls of the cylinder block are formed with ribs in the vertical and horizontal directions by the outer walls of the water passage and the communication passage, high rigidity of the cylinder block and good sound and vibration performance can be obtained.

In this case, as in the fourteenth aspect of the invention, by forming the communication passage between the cylinder bores, the sound and vibration performance is further improved, and at the same time, the communication passage supplies the oil supplied to each part of the cylinder head to the oil pan. Since it is close to the oil drop passage that returns to, it can also exchange heat with the oil.

According to a fifteenth invention, the control valve according to the eighth invention is built in the engine front cover, and
Since the mounting flange of the oil filter is formed on the engine front cover, the oil pump, the oil filter, the control valve, and the oil passage can be easily connected, and the structure is simplified.

In this case, as in the sixteenth aspect of the invention, by forming the oil passage from the oil pump to the oil filter and the control valve in the engine front cover, the structure on the engine front side is further simplified.

In the seventeenth invention, since the control valve in the eighth invention is built in the oil pan or the ladder frame thereof and the mounting flange of the oil filter is formed in the oil pan or the ladder frame thereof, the control valve and the oil filter are formed. Installation becomes easy.

In this case, as in the eighteenth aspect, the structure is further simplified by forming the oil passage connecting at least the oil filter and the control valve in the oil pan or the ladder frame thereof.

[0046]

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

As shown in FIG. 1, in the engine cooling structure, the cooling water from the water pump 10 installed on the engine front side is sent to the water jacket 12 of the cylinder block 11 and flows toward the engine rear side. The water is introduced into the water jacket 14 of the cylinder head 13 through the openings provided in the upper portion of the water jacket 12. The cooling water that has flowed into the water jacket 14 of the cylinder head 13 flows through the water jacket 14 toward the engine rear side, and then flows out of the jacket through the outlets 15 and 16.

The water jacket 12 of the cylinder block 11 has a shallow bottom shape as shown in FIG. 2, that is, in order to reduce friction by maintaining the cylinder wall temperature at a high temperature, the piston at the time of bottom dead center is used. It is formed in a shallow bottom shape up to a portion substantially corresponding to the ring position.

A radiator inlet passage 17 is connected to one outlet 15 of the water jacket 14, and a radiator bypass passage 1 is connected to the other outlet 16.
8 are connected.

The outlet 16 is provided in the bypass passage 18.
2, and a water passage 22 is formed in the cylinder block 11 in the cylinder row direction near the starting point of the skirt portion 21 below the water jacket 12 in the cylinder block 11 as shown in FIG. The water passage 22 is formed on the outer side of the engine close to the main gallery described later.

The return passage 23 downstream of the water passage 22 and the radiator outlet passage 24 are connected to an inlet-side passage 26 of the water pump 10 via a thermostat 25.

The thermostat 25 is provided with a predetermined opening 27 for communicating the return passage 23 with the inlet side passage 26 of the water pump 10 as shown in FIG. That is, as shown in FIG. 4, when the cooling water temperature is below a predetermined value and the return passage 23 is opened by the thermostat 25 (the outlet passage 24 of the radiator is closed), the water of the cylinder block 11 and the cylinder head 13 is reduced. Jacket 1
When almost all the cooling water that has passed through 2 and 14 is made to flow into the water passage 22 and the cooling water temperature is high and the radiator outlet passage 24 is opened by the thermostat 25, the water jacket 1 of the cylinder block 11 and the cylinder head 13 is
Most of the cooling water that has passed through 2 and 14 is guided to the radiator, while some of the cooling water passes through the opening 27 and the water passage 2
Is flushed to 2.

The outer wall 28 of the water passage 22 is formed so as to form a lateral rib of the cylinder block 11 as shown in FIG. One or more communication passages 20 that connect the water passage 22 and the outlet 16 of the cylinder head 11 are provided, and the outer wall 30 of the communication passage 20 has the cylinder block 1
1 to form a vertical rib. Communication passage 20
Are formed between the cylinder bores 31.

Reference numeral 32 is a heater passage leading to a heater core for heating the passenger compartment.

FIG. 6 shows an oil feeding system of the lubricating device, 33 is an oil pan, and 34 is an oil pump driven by an engine.

The oil discharged from the oil pump 34 is sent to a head gallery 35 on the cylinder head 13 side and a main gallery 36 of the crankshaft system through an oil filter (not shown).

The oil sent to the head gallery 35 is
It is supplied to cams of valve trains, cam journals, hydraulic lash adjusters of intake and exhaust valves, etc.

The oil sent to the main gallery 36 is
It is supplied to the connecting rod bearing and the like from the main bearing of the crankshaft and the oil hole inside the shaft. The main gallery 36 is, as shown in FIG.
1 is provided in the cylinder row direction in the vicinity of the start point of the skirt portion 21 (the water passage 22 is close thereto), and is connected to the main bearing side via supply passages 37 formed at predetermined positions.

A relief passage 40 is provided in the discharge side passage 38 of the oil pump 34, and when the discharge pressure of the oil pump 34 is a predetermined value or more, the relief valve 41 of the relief passage 40 is opened to return the relief oil to the suction side. Be done.

The main gallery 36 is formed by drilling, and the water passage 22, the communication passage 20 (cylinder block portion) and the like are formed by integral casting (casting) with the cylinder block 11.

In this case, the water passage 22 may be formed to have a passage cross section that extends from the vicinity of the starting point of the skirt portion 21 of the cylinder block 11 to the vicinity of the center of the skirt portion 21 as shown in FIG.

Due to such a configuration, the oil pump 34
The discharged oil is sent to the head gallery 35 and the main gallery 36 via the oil filter.

The oil in the head gallery 35 is supplied to the cams of the valve train, the cam journals, the hydraulic lash adjusters of the intake and exhaust valves, etc., and the oil that has been lubricated is supplied to the cylinder head 13 and the cylinder block 11. It is returned to the oil pan 33 through the formed oil drop passage 42 (see FIG. 5).

The oil in the main gallery 36 exchanges heat with the cooling water in the adjacent water passage 22 when passing through the main gallery 36, and also from the supply passage 37 through the main bearing of the crankshaft and the oil hole inside the shaft. After being supplied to the connecting rod bearing and lubricated, the oil pan 3
Returned to 3.

Here, in the water passage 22, the cylinder block 11, the water jacket 12 of the cylinder head 13,
While the cooling water that has passed through 14 flows, in the engine with the water jacket 12 having a shallow bottom, the cooling water temperature rises rapidly after the engine is started.

Therefore, the temperature of the oil can be quickly raised during the warm-up operation, and the friction can be greatly reduced by making the water jacket 12 shallow.

On the other hand, when the temperature of the engine is high, most of the cooling water passes through the radiator, so that the cooling water flowing through the water passage 22 has a substantially balanced temperature.

Therefore, the oil can be cooled, and the temperature of the oil does not become too high during high temperature and high speed operation,
Can maintain an appropriate equilibrium oil temperature.

In this case, the oil in the main gallery 36 of the crankshaft system, which has a large amount of oil, is heat-exchanged, so that the heat exchange can be favorably performed.

Further, since the water passage 22 is formed by casting and the main gallery 36 is formed by drilling, the interval between the passages 22 and 36 can be narrowed, and high heat conductivity can be obtained. If both the passages 22 and 36 are formed by casting, a double core is required and the productivity is deteriorated. In addition, due to the wall thickness limitation between the cores due to the casting accuracy, the passages 22 and 36 cannot be formed. It becomes difficult to reduce the distance.

Since the water passage 22 is located outside the engine with respect to the main gallery 36, the main gallery 36
It becomes easy to form the supply passage 37 from the side to the main journal side of the crankshaft.

Further, the water passage 22 is connected to the cylinder block 11
Since it is provided near the starting point of the skirt portion 21, it is possible to prevent a decrease in rigidity near the starting point of the skirt portion 21 due to the shallow structure of the water jacket 12 due to its wall structure.

Further, the outer wall 28 of the water passage 22 and the communication passage 20
Since the outer wall 30 and the outer wall 30 form ribs vertically and horizontally on the outer wall portion of the cylinder block 11, the bending and torsional rigidity of the cylinder block 11 is improved, and the sound vibration performance is improved.

Further, in this case, by forming the communication passage 20 between the cylinder bores 31, the sound vibration performance and the like are further improved, and at the same time, the communication passage 20 transfers the lubricated oil from the cylinder head 13 side to the oil pan. Oil drop passage 4 to return
In the vicinity of 2, the heat exchange with the oil can be performed, and the efficiency is improved.

Further, when the water passage 22 is formed in the passage cross section from the vicinity of the starting point of the skirt portion 21 of the cylinder block 11 to the vicinity of the center of the skirt portion 21 as shown in FIG. 7, the water passage 22 scatters due to whirling of the crank, etc. The wall flow along the case inner wall (skirt part inner wall) 43 is positively exchanged with the oil returning to the oil pan 33, and the heat exchange can be sufficiently promoted.

FIG. 8 shows another example of the oil feeding system of the lubricating device.

The main gallery 36, which is connected to the discharge side passage 38 of the oil pump 34 downstream of an oil filter (not shown) and sends oil to the crankshaft system, is provided in the water passage 22 of the cylinder block 11 in the same manner as in the previous embodiment. It is formed adjacent to and heat exchange between oil and cooling water.
In this case, a relief passage 45 provided with a relief valve 44 is formed downstream of the main gallery 36, and is connected to the suction side of the oil pump 34 via the relief passage 45.

The oil from the oil pump 34 is sent to the head gallery 35 and the main gallery 36, and
When the discharge pressure exceeds a predetermined value, the main gallery 36
The relief valve 44 of the relief passage 45 on the downstream side is opened, and the relief oil is returned to the suction side of the oil pump 34 via the main gallery 36. That is, the higher the engine speed is, the more oil is flowed to the main gallery 36.

In this way, sufficient heat exchange between the oil and the cooling water can be performed during the engine high speed operation where the oil temperature becomes high.

The relief passage 45 may be formed close to the water passage 22 like the main gallery 36.

FIG. 9 shows still another example of the oil feeding system of the lubricating device.

The main gallery 36, which is connected to the discharge side passage 38 of the oil pump 34 downstream of an oil filter (not shown) and sends oil to the crankshaft system, is provided in the water passage 22 of the cylinder block 11 as in the above-described embodiment. Is formed adjacent to and forms heat exchange between oil and cooling water, and forms a relief passage 45 provided with a relief valve 44 downstream of the main gallery 36, and sucks the oil pump 34 through the relief passage 45. In this case, a control valve 46 for controlling the oil flow rate is provided at the inlet of the main gallery 36.

The control valve 46 comprises an orifice portion 47 for keeping the minimum flow rate and a valve portion 48 for opening the flow passage according to the discharge pressure of the oil pump 34.

If this control valve 46 is provided, a predetermined amount of oil can be supplied to the head gallery 35 side even when the engine is running at a low engine speed when the discharge amount of the oil pump 34 is not so large, and as the engine speed increases, the main gallery 36 increases. The required amount of oil can be supplied to the side, and the heat exchange between the oil and the cooling water can be efficiently performed during the operation in which the oil temperature starts to rise to some extent, and the heat exchange can be sufficiently performed at the high engine speed.

Although not shown in the drawings, in each embodiment, the main gallery 36 may be formed so as to serve as an oil jet passage for ejecting oil from the oil jet to the piston sliding portion.

10 and 11 show an example in which the water passage 50 formed in the cylinder block 11 is used as an inlet side passage of a radiator.

Water pump 10 on the engine front side
The cooling water is sent to the water jacket 12 of the cylinder block 11, flows toward the engine rear side, and flows into the water jacket 14 of the cylinder head 13 through an opening provided in the upper portion of the water jacket 12.
The cooling water flowing into the water jacket 14 of the cylinder head 13 flows from the engine rear side to the front side and flows out of the jacket 14 from the outlet 51.

The outlet 51 is divided into two, one is connected to the return passage 52, and the other is connected to the cylinder block 11 near the start point of the skirt portion 21 below the water jacket 12 via the communication passage 53. It is connected to a water passage 50 formed in the cylinder row direction. The water passage 50
It is formed on the outer side of the engine close to the main gallery 36 of the lubricating device. (See FIG. 2, etc.).

The downstream side of the water passage 50 is connected to the radiator inlet passage 54, and the radiator outlet passage 55 and the return passage 52 are connected to the inlet side passage 26 of the water pump 10 via a thermostat 56.

That is, as shown in FIG. 11, when the cooling water temperature is below a predetermined value and the return passage 52 is opened by the thermostat 56 (the radiator outlet passage 55 is closed), the cylinder block 11 and the cylinder head 13 are closed. In the state where the cooling water that has passed through the water jackets 12 and 14 is returned to the water pump 10 from the return passage 52 and the temperature of the cooling water is high and the radiator outlet passage 55 is opened by the thermostat 56, the cylinder block 11 and the cylinder head. Substantially all of the cooling water that has passed through the water jackets 12 and 14 of 13 is flown into the water passage 50, is introduced into the radiator, and is returned to the water pump 10 via the outlet passage 55.

Therefore, when the engine temperature is high, the water passage 5
Since the cooling water sufficiently flows to 0, heat exchange with the oil of the main gallery 36 can be promoted, and a more appropriate equilibrium oil temperature can be secured as compared with the example of FIG.

12 and 13 show an example in which the water passage 57 formed in the cylinder block 11 is used as the outlet side passage of the radiator.

Water pump 10 on the engine front side
The cooling water is sent to the water jacket 12 of the cylinder block 11, flows toward the engine rear side, and flows into the water jacket 14 of the cylinder head 13 through an opening provided in the upper portion of the water jacket 12.
The cooling water flowing into the water jacket 14 of the cylinder head 13 flows from the engine rear side to the front side and flows out of the jacket 14 from the outlet 58.

The outlet 58 is divided into two, a return passage 60 is formed on one side, and an inlet passage 61 of the radiator is connected on the other side.

In the radiator outlet passage 62, the introduction passage 6 is provided.
3, the water passage 57 formed in the cylinder row direction is connected to the cylinder block 11 near the start point of the skirt portion 21 below the water jacket 12. The water passage 57 is formed on the outer side of the engine in the vicinity of the main gallery 36 of the lubricating device (see FIG. 2, etc.).

The connecting passage 64 and the return passage 60 downstream of the water passage 57 are connected to the inlet passage 26 of the water pump 10 via a thermostat 65.

That is, as shown in FIG. 13, when the cooling water temperature is below a predetermined value and the return path 60 is opened by the thermostat 65, almost all the cooling water that has passed through the water jackets 12 and 14 of the cylinder block 11 and the cylinder head 13. The entire amount is returned to the water pump 10 from the return passage 60, the cooling water temperature is high, and the communication passage 64 is opened by the thermostat 65 (the radiator outlet passage 62 is opened).
Then, almost all the cooling water that has passed through the water jackets 12 and 14 of the cylinder block 11 and the cylinder head 13 is introduced into the radiator, flows through the water passage 57, and is returned to the water pump 10.

Therefore, since the cooling water cooled through the radiator when the engine is hot flows into the water passage 57, the oil in the main gallery 36 can be sufficiently cooled, and the equilibrium oil temperature can be kept higher than in the case of FIG. Can be lowered.

14 to 17 show examples of mounting and structure when a control valve is provided at the inlet of the main gallery 36.
This is the main gallery 36 and the oil jet passage 66.
And another passage.

In the control valve 67, a valve body 70 is slidably accommodated in a pipe-shaped body 68 as shown in FIG. 16, and a spring 71 urges the valve body 70 toward the front end side of the body 68. A circumferential groove 72 is formed at a predetermined position on the circumferential portion of the valve body 70, and a guide hole 73 connected to the circumferential groove 72 is opened at the front end portion. An inlet hole 74 is formed at the front end of the body 68, and outlet holes 75 and 76 are formed at predetermined positions from the front end at two positions on the side surface on the front end side in the orthogonal direction.

At the inlet of the main gallery 36 formed in the cylinder block 11, a valve hole 77 is formed from the crankcase inner wall (skirt inner wall) 43 side as shown in FIGS. An attachment surface 80 for attaching the oil filter 78 is formed on the outer wall of the skirt portion 21 in front of the valve hole 77, and the discharge side passage 3 of the oil pump 34 is formed.
8 and an inlet passage 81 of the oil filter 78 connected to the valve 8 and an outlet passage 8 of the oil filter 78 connected to the valve hole 77.
2 and are opened. The head gallery 35 is branched in the middle of the outlet flow path 82, and the oil jet passage 66 is connected to the front end portion of the valve hole 77 via a guide hole 83 provided in a direction orthogonal to the main gallery 36.

The control valve 67 is inserted and installed in the valve hole 77 by aligning the outlet hole 76 of the body 68 with the main gallery 36 and the outlet hole 75 with the guide hole 83 of the oil jet passage 66. The mounting base portion 84 of the control valve 67 is provided with a positioning projection 85.

The oil discharged from the oil pump 34 is supplied to the inlet passage 81, the oil filter 78 and the outlet passage 82.
Through the head gallery 35 and the control valve 67 side, but the engine rotation is low and the oil pump 34
When the discharge amount of the control valve 67 is not so large, the valve body 70 of the control valve 67 is maintained at the almost initial position, and the guide hole 73 and the circumferential groove 7
The main gallery 36 is opened by only 2 so that most of the oil is sent to the head gallery 35 and part of it is sent to the main gallery 36.

The engine speed increases and the oil pump 3
4 increases, the valve body 70 of the control valve 67 increases.
Is retreated to open the oil jet passage 66, and oil is also sent to the oil jet passage 66.

When the engine speed further rises,
The main gallery 36 is opened by the retreat of the valve body 70 of the control valve 67, and the oil sent to the main gallery 36 is increased.

Therefore, a predetermined amount of oil is supplied to the head gallery 35 when the engine is running at a low speed, and a required amount of oil is supplied to the main gallery 36 and the oil jet passage 66 as the engine speed increases.

In this way, the control valve 67 and the oil filter 78 can be easily attached, and the flow path connection and structure can be simplified.

18 to 22 show an example in which the control valve 86 and the oil filter 78 are arranged on the engine front cover 87. FIG. 18 shows an oil feeding system, FIGS. 19 and 20 show a front side of the front cover 87 and a cutaway section, and FIGS. 21 and 22 show a back side of the front cover 87 and a partial cross section.

The oil pump 34 is disposed substantially in the lower center of the front cover 87, the suction port 88 is formed in the lower peripheral portion thereof, and the discharge port 90 is formed in the obliquely upper peripheral portion thereof.

A pipe 92 is connected to a hole 91 connected to the suction port 88, and a strainer 93 attached to the tip of the pipe 92 is installed in the oil pan 33.

On the front side of the discharge port 90 in the flow direction, a flange portion 94 for attaching the oil filter 78 is formed on the side portion of the front cover 87 formed on the inclined surface. An inlet channel 95 connected to the discharge port 90 and an outlet channel 96 parallel to the inlet channel 95 are opened in the flange portion 94,
The oil filter 78 is attached to the flange portion 94.

The outlet flow path 96 has a gentle curved path on the upper side of the discharge port 90 and the oil pump 34, and the front cover 8 is provided.
7 is extended to the opposite side, and the control valve 86 is provided on the downstream side.
Is provided.

In the control valve 86, a valve hole 97 is formed in the side portion of the front cover 87, and the valve body 98 and the valve body 9 are formed.
A spring 100 for urging 8 toward the front end is housed.
On the side surface of the front end of the valve hole 97, a small port 101 that is always opened and a port 1 that is opened when the valve body 98 is retracted.
02 are formed, and these are connected to the connection port 103 with the main gallery 36.

A branch flow passage 105 connected to the connection port 104 with the head gallery 35 is provided in the middle of the outlet flow passage 96.
Are formed.

A return port 107 connected to a return passage (relief passage) 106 downstream of the main gallery 36 is formed below the control valve 86, and the return port 107 is connected to a suction port 88 of the oil pump 34 via a relief valve 108. Connected.

In the relief valve 108, the valve hole 110 is opened from the lower part of the front cover 87, and the valve body 11
1 and a spring 112 for urging the valve element 111 toward the front end side are housed and formed.

A safety valve 113 that opens when the discharge pressure becomes abnormally high is provided between the discharge port 90 and the suction port 88 of the oil pump 34.

As shown in FIG. 23, the control valve 8
No. 6 starts to open the port 102 when the discharge pressure of the oil pump 34 reaches the specified value A, and fully opens the port 102 at the specified value B so that the relief valve 108 is the oil pump 3
When the discharge pressure of No. 4 reaches the specified value D, the return port 107 is set to start opening to the suction port 88 of the oil pump 34.

The oil discharged from the oil pump 34 is supplied to the inlet passage 95, the oil filter 78, and the outlet passage 96.
Through the branch flow passage 105 and the connection port 104 to the head gallery 35, and via the control valve 86 downstream of the outlet flow passage 96 and the connection port 103 to the main gallery 3.
Sent to 6.

The engine rotation is low and the oil pump 34
When the discharge amount of is not so large (the discharge pressure is the specified value A
(Below), the connection port 103 is opened only by the small port 101 of the control valve 86, so that most of the oil is sent to the head gallery 35, and part of it is in the main gallery 3
Sent to 6.

When the engine speed increases and the discharge amount of the oil pump 34 increases and the discharge pressure becomes equal to or higher than the specified value A, the port 102 of the control valve 86 is opened and the oil sent to the main gallery 36 is increased. .

When the engine speed further increases and the discharge amount of the oil pump 34 increases and the discharge pressure becomes equal to or higher than the specified value B, the port 102 of the control valve 86 is fully opened, and sufficient oil is sent to the main gallery 36. .

Then, as the engine speed further rises, the discharge amount of the oil pump 34 increases and the discharge pressure becomes the specified value D.
In the above, the return passage 10 downstream of the main gallery 36
Relief valve 108 in return port 107 leading to 6
Is opened, and the relief oil is returned from the return passage 106 to the suction side of the oil pump 34 via the return port 107.

As a result, a predetermined amount of oil is supplied to the head gallery 35 even when the engine speed is low, a required amount of oil is supplied to the main gallery 36 as the engine speed increases, and the engine speed is high. A large amount of oil is sometimes flushed into the main gallery 36.

By doing so, the installation of the oil pump 34, the oil filter 78, the control valve 86, etc., and the construction and connection of each flow path are facilitated, and the structure on the engine front side can be simplified.

24 to 32, the control valve 114 and the oil filter 78 are connected to the ladder frame 11 of the oil pan 33.
5 is an example of arrangement. FIG. 24 shows the arrangement and FIG.
5 to 28 show a front cover portion, and FIGS. 29 to 32 show a ladder frame portion.

The oil pump 34 is arranged substantially in the lower center of the front cover 116, the suction port 117 is provided obliquely below the periphery thereof, and the discharge port 11 is provided obliquely above the periphery thereof.
8 are formed.

A pipe 121 is connected to the hole 120 connected to the suction port 117, and a strainer 122 attached to the tip of the pipe 121 is installed in the oil pan 33.

Flow path 123 connected to discharge port 118
Is extended from the side portion of the front cover 116 to the ladder frame 115 side of the oil pan 33 attached to the lower portion of the cylinder block 11 made of aluminum alloy or the like, and the flange portion for attaching the oil filter 78 to the side portion of the ladder frame 115. 124 is provided.

In the ladder frame 115, the flow path 12 is formed.
3, the inlet flow path 125 of the oil filter 78 connected to
And the outlet channel 126 are formed, and the oil filter 78
The downstream side of the outlet channel 126 extending to the opposite side is branched into a head side channel 127 and a main side channel 128.

A valve hole 130 of the control valve 114 is opened from the side portion of the ladder frame 115 through the head side flow passage 127 and the main side flow passage 128, and the valve hole 130 is formed.
The spring 131 and the valve body 132 biased by the spring 131 in the closing direction of the main-side flow path 128 are housed therein, and the mounting plug 133 also serving as a stopper of the valve body 132.
Is fixed. A hole 134 is formed in the shaft portion of the mounting plug 133 so as not to block the head-side channel 127. Disc 1
The tip end portion of 32 is formed to have a small diameter, and the minimum flow passage area of the main side flow passage 128 is set, and it is opened by the pressure of the oil received at the step and the tip end of the valve body 132.

The downstream side of the head side channel 127 and the downstream side of the main side channel 128 are respectively the front cover 116.
Is connected to guideways 135 and 136 formed on the side of the. The guide passage 135 is connected to the head gallery 35 of the cylinder head 13, and the guide passage 136 is connected to the main gallery 36 of the cylinder block 11 via the connection port 137 and the like.

In the vicinity of the guide passage 136, a return port 140 connected to a return passage (relief passage) 138 downstream of the main gallery 36 (the position is shifted in FIG. 24).
Is formed, the return port 140 has a relief valve 141
Through the suction port 117 of the oil pump 34. The relief valve 141 includes the front cover 11
A valve hole 142 is formed from the lower part of 6.

A safety valve 143 is provided between the discharge port 118 and the suction port 117 of the oil pump 34 so as to open when the discharge pressure becomes abnormally high.

As shown in FIG. 23, the control valve 11
When the discharge pressure of the oil pump 34 begins to open when the discharge pressure of the oil pump 34 reaches the specified value A and fully opens the main side flow path 128 at the specified value B, the relief valve 141 changes the discharge pressure of the oil pump 34. When the specified value D is reached, the return port 140 is set to start opening to the suction port 117 of the oil pump 34.

In this way, the structure on the engine front side can be simplified, and since the ladder frame 115 made of aluminum alloy or the like having good workability is used, the oil filter 78,
The control valve 114 and the like can be installed and connected more easily, and high manufacturability can be secured.

The oil filter 78 and the control valve 1
It is also possible to install and form 14 and these connecting channels in the frame of the oil pan 33.

[0138]

As described above, according to the first aspect of the invention, since the water passage for passing the cooling water is formed below the shallow water jacket adjacent to the oil passage of the lubricating device, the oil and the cooling water are The heat can be exchanged and good lubrication can be secured.

According to the second aspect of the invention, since the cooling water that bypasses the radiator flows through the water passage, the oil quickly rises when the engine temperature is low, and the friction is reduced.

According to the third aspect of the present invention, in this case, a part of the cooling water flows even when the thermostat opens the radiator passage in the water passage. The oil temperature is maintained.

According to the fourth aspect of the invention, since the cooling water flowing toward the radiator flows through the water passage, sufficient cooling water promotes heat exchange with the oil when the engine temperature is high, and a more appropriate equilibrium oil temperature is secured. To be done.

According to the fifth aspect of the invention, since the cooling water that has passed through the radiator flows through the water passage, the oil can be sufficiently cooled when the engine temperature is high, and the equilibrium oil temperature can be lowered.

According to the sixth aspect of the invention, the amount of oil sent to the bearing portion of the crankshaft through the oil passage is large, so that heat exchange with the cooling water is favorably performed.

According to the seventh invention, by providing the relief valve, a large amount of oil can be passed through the oil passage, and heat exchange with the cooling water is further promoted.

According to the eighth aspect of the present invention, by providing the control valve at the inlet of the oil passage and the relief valve, it is possible to supply a predetermined amount of oil to each sliding portion while at the same time requesting cooling water. Street heat exchange is ensured.

According to the ninth aspect, since the water passage is located on the outer side of the engine, the passage can be easily formed from the oil passage to the bearing portion of the crankshaft.

According to the tenth aspect of the invention, since the water passage is provided near the skirt start point of the cylinder block, a decrease in rigidity near the skirt start point can be prevented.

According to the eleventh aspect of the invention, since the water passage is formed in a cross section that extends from the vicinity of the skirt start point of the cylinder block to the vicinity of the center of the skirt, heat exchange with the flow of oil along the inner wall of the crankcase can be satisfactorily performed. .

According to the twelfth aspect, since the water passage is formed by casting and the oil passage is formed by drilling, the productivity is good, and both passages are formed adjacent to each other to ensure high heat transfer.

According to the thirteenth aspect of the invention, the outer wall of the cylinder block is formed with ribs vertically and horizontally by the outer walls of the water passage and the communication passage. Therefore, the cylinder block having a shallow water jacket has high rigidity and good sound vibration. Performance is obtained.

According to the fourteenth invention, in this case, by forming the communication passage between the cylinder bores, the sound and vibration performance is further improved, and the oil supplied from the communication passage to each part of the cylinder head is sent to the oil pan. The heat exchange with the oil can be excellently performed in the vicinity of the returning oil drop passage.

According to the fifteenth aspect, when the control valve is provided, the control valve is built in the engine front cover and the mounting flange of the oil filter is formed on the engine front cover. The valve can be installed and the oil passage can be easily connected, which simplifies the structure.

According to the sixteenth aspect, in this case, the structure is further simplified by forming the oil passage from the oil pump to the oil filter and the control valve in the engine front cover.

According to the seventeenth invention, when the control valve is provided, the control valve is built in the oil pan or the ladder frame thereof, and the mounting flange of the oil filter is formed in the oil pan or the ladder frame thereof. The valve and oil filter can be installed easily.

According to the eighteenth invention, in this case, the oil passage connecting at least the oil filter and the control valve is formed in the oil pan or the ladder frame thereof, thereby further simplifying the structure.

[Brief description of drawings]

FIG. 1 is a perspective view showing a cooling structure and a flow of cooling water according to an embodiment.

FIG. 2 is a sectional view of a cylinder block.

FIG. 3 is a sectional view of a thermostat.

FIG. 4 is an operation explanatory diagram of a cooling system.

FIG. 5 is a perspective view of a cylinder block.

FIG. 6 is a lubrication system diagram.

FIG. 7 is a sectional view of a water passage according to another embodiment.

FIG. 8 is a lubrication system diagram of another embodiment.

FIG. 9 is a lubrication system diagram of another embodiment.

FIG. 10 is a perspective view showing a cooling structure and a flow of cooling water according to another embodiment.

FIG. 11 is an operation explanatory view of the cooling system.

FIG. 12 is a perspective view showing a cooling structure and a flow of cooling water according to another embodiment.

FIG. 13 is an operation explanatory view of the cooling system.

FIG. 14 is an arrangement configuration diagram of a lubricating device according to another embodiment.

FIG. 15 is a mounting view of a control valve.

FIG. 16 is a perspective view of a control valve.

FIG. 17 is a sectional view of a control valve.

FIG. 18 is an arrangement configuration diagram of a lubricating device according to another embodiment.

FIG. 19 is a front view of the front cover.

FIG. 20 is a partially cutaway sectional view thereof.

FIG. 21 is a rear view of the front cover.

FIG. 22 is a partial cross-sectional view thereof.

FIG. 23 is an operating characteristic diagram of each valve.

FIG. 24 is a layout configuration diagram of a lubricating device according to another embodiment.

FIG. 25 is a rear view of the front cover.

FIG. 26 is a front view of the pump cover portion.

27 is a cross-sectional view taken along the line AA of FIG.

28 is a cross-sectional view taken along the line BB of FIG.

FIG. 29 is a front view of the ladder frame.

FIG. 30 is a partial cross-sectional view thereof.

FIG. 31 is a partial side view thereof.

FIG. 32 is a partial side view thereof.

FIG. 33 is a perspective view of a conventional cooling system.

FIG. 34 is a sectional view of a cylinder block.

[Explanation of symbols]

 10 Water Pump 11 Cylinder Block 12 Water Jacket 13 Cylinder Head 14 Water Jacket 18 Bypass Passage 20 Communication Passage 21 Skirt 22 Water Passage 25 Thermostat 33 Oil Pan 34 Oil Pump 35 Head Gallery 36 Main Gallery 44 Relief Valve 45 Relief Passage 46 Control Valve 47 Orifice part 48 Valve part 50 Water passage 53 Communication passage 56 Thermostat 57 Water passage 63 Inlet passage 65 Thermostat 66 Oil jet passage 67 Control valve 77 Valve hole 78 Oil filter 86 Control valve 87 Front cover 88 Suction port 90 Discharge port 94 Flange part 95 inlet flow passage 96 outlet flow passage 97 valve hole 98 valve body 100 spring 101 small port 102 port 1 05 Branch flow passage 107 Return port 108 Relief valve 110 Valve hole 111 Valve body 112 Spring 114 Control valve 115 Ladder frame 116 Front cover 117 Suction port 118 Discharge port 123 Flow passage 124 Flange 125 Inlet flow passage 126 Outlet flow passage 127 Head side Flow path 128 Main side flow path 130 Valve hole 131 Spring 132 Valve body 135, 136 Guide path 140 Return port 141 Relief valve 142 Valve hole

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location F01P 11/08 B

Claims (18)

[Claims] 1. A cooling device provided with a circulation path for circulating cooling water of a water jacket through a water pump,
In an engine equipped with a lubrication device that guides oil from an oil pump to each sliding part, etc., the water jacket of the cylinder block has a shallow bottom shape up to a portion substantially corresponding to the piston ring position when the piston is at bottom dead center. On the other hand, a water oil heat exchange device for an engine, characterized in that a water passage through which cooling water is passed is formed below the water jacket in the cylinder row direction, and an oil passage of a lubricating device is adjacent to this water passage. . 2. The water / oil heat exchange device for an engine according to claim 1, wherein the water passage is a bypass passage of a radiator provided in a circulation passage of a cooling device. 3. The water-oil heat exchange device for an engine according to claim 2, wherein a part of the cooling water flows through the bypass passage even when the thermostat opens the radiator passage. 4. The water-oil heat exchange device for an engine according to claim 1, wherein the water passage is an inlet passage of a radiator provided in a circulation passage of a cooling device. 5. The water-oil heat exchange device for an engine according to claim 1, wherein the water passage is an outlet passage of a radiator provided in a circulation passage of the cooling device. 6. The oil passage is a passage for guiding oil from an oil pump to a bearing portion of a crankshaft.
The water-oil heat exchange device for the engine according to. 7. The water-oil heat exchange device for an engine according to claim 1, wherein a downstream side of the oil passage is connected to a suction side of an oil pump via a relief valve. 8. A control valve for controlling a flow rate of oil is provided at an inlet portion of the oil passage, and a downstream side of the oil passage is connected to a suction side of an oil pump via a relief valve. The water-oil heat exchange device for the engine according to. 9. The water-oil heat exchange device for an engine according to claim 1, wherein the water passage is provided outside the engine with respect to the oil passage. 10. The water-oil heat exchange device for an engine according to claim 1, wherein the water passage is provided near a skirt start point of the cylinder block. 11. The water-oil heat exchange device for an engine according to claim 1, wherein the water passage has a cross-sectional shape that extends from the vicinity of the skirt start point of the cylinder block to the vicinity of the center of the skirt. 12. The water-oil heat exchange device for an engine according to claim 1, wherein the water passage is formed by casting and the oil passage is formed by drilling. 13. Forming one or more communication passages connecting the water passage and the water outlet of the cylinder head, the outer wall of the communication passage constitutes a longitudinal rib of the cylinder block, and the outer wall of the water passage forms the cylinder block. 2. The water-oil heat exchange device for an engine according to claim 1, wherein the water-oil heat exchange device comprises a horizontal rib. 14. The water-oil heat exchange device for an engine according to claim 13, wherein the communication passage is formed between cylinder bores. 15. The water / oil heat exchanger according to claim 8, wherein the control valve is built in the engine front cover, and the mounting flange of the oil filter is formed on the engine front cover. 16. The water-oil heat exchange device for an engine according to claim 15, wherein an oil passage from the oil pump to the oil filter and the control valve is formed in the engine front cover. 17. The engine water oil according to claim 8, wherein the control valve is built in the oil pan or the ladder frame thereof, and the mounting flange of the oil filter is formed on the oil pan or the ladder frame thereof. Heat exchange equipment. 18. The water-oil heat exchange device for an engine according to claim 17, wherein an oil passage connecting at least the oil filter and the control valve is formed in an oil pan or a ladder frame thereof.