JPH07180523A - Lubricating device for internal combustion engine - Google Patents

Abstract

PURPOSE:To make a speedy temperature rise in lubricating oil in warming up compatible with reduction in balanced oil temperature in A steady state by forming a circulating path capable of circulating excess lubricating oil from a head side oil path to the suction side of a lubricating oil pump, and providing a valve means to control a circulating oil amount in the circulating path. CONSTITUTION:Oil paths 33, 34, and 35 to lead lubricating oil from a lubricating oil pump 21 to each part of the valve gear system of a cylinder head 31 through the inside of cooling water of a cylinder head 31 or in the vicinity of it are formed. Also a lubricating oil path 46 to enable circulation of excess lubricating oil from the oil paths 33, 34, and 35 to the suction side of the lubricating oil pump 21 is formed, and a valve means 47 to control the lubricating oil amount is provided in the lubricating oil path 46. Thus both increase in warming up performance and reduction in balanced oil temperature can be compatible with each other, and a lubricating device can be used for engines in which cooling water amount is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating device for an internal combustion engine.

[0002]

2. Description of the Related Art In a lubricating system for an internal combustion engine, as shown in FIG. 23, a lubricating oil pump 1 sucks up a lubricating oil from an oil pan 2 and discharges the lubricating oil through an oil filter 3 and each gallery 4, 5 to a crankshaft. System, a valve train arranged in the cylinder head 6, and the like.

Lubricating oil sent to the crankshaft system is supplied to a main bearing, a connecting rod bearing, etc. through an oil hole inside the shaft, and the oil that lubricates these is dropped to an oil pan 2.

Lubricating oil for the head gallery 5 is supplied to the cam nose, etc. from the hydraulic crush adjuster (HLA) 9 of the intake valve 7, the exhaust valve 8, the cam journal, and the oil tube 10, and the oil that operates and lubricates them is Are collected in the upper deck 11 of the cylinder head 6 and returned to the oil pan 2 from the cylinder head 6 through the oil drop hole 13 penetrating the cylinder block 12. An orifice 14 is provided at the inlet of the head gallery 5.

Lubricating oil is supplied to the timing chain and the like, and is also jetted to the sliding side of the piston from an oil jet provided in the cylinder and the like (automobile technology issued by the Society of Automotive Engineers of Japan, December 1, 1990). (See Handbook, Volume 1, Volume 53, etc.).

[0006]

Such a lubricating oil is
When the oil temperature is low such as when cold, it is desirable to raise the temperature quickly in order to reduce friction.

In the conventional case, the lubricating oil supplied to the valve operating system of the cylinder head 6 flows on the surface of the upper deck 11, and when it is returned from the oil drop hole 13 to the oil pan 2, it is mixed with the cooling water in the cylinder head 6. Although heat exchange is performed, efficient heat exchange using cooling water cannot be obtained due to the laminar flow.

On the other hand, in recent years, there has been a tendency to decrease the amount of cooling water in the engine in order to promote warm-up, and the equilibrium oil temperature of the lubricating oil tends to increase accordingly.

In a V-type engine in which the oil drain hole 13 is provided especially on the exhaust side, the oil temperature tends to be high.

Therefore, if the heat exchange with the cooling water is not good, the lubricating performance will be deteriorated and the warm-up performance will be affected.

It is an object of the present invention to provide a lubricating device which is capable of achieving both a rapid temperature increase of the lubricating oil during warm-up and a decrease in the equilibrium oil temperature during steady state and which is excellent in practicality.

[0012]

According to a first aspect of the present invention, there is provided a head side oil passage for guiding the lubricating oil from the lubricating oil pump to the respective parts of the valve operating system of the cylinder head through the cooling water of the cylinder head or the vicinity thereof. The head side oil passage is formed with a circulation passage in which surplus lubricating oil can be circulated on the suction side of the lubricating oil pump, and valve means for controlling the amount of circulating oil is provided in the circulation passage.

According to a second aspect of the invention, in the first aspect of the invention, an oil jet lubrication passage for ejecting lubricating oil from the oil jet to the piston sliding side is connected to the circulation passage downstream of the valve means.

According to a third aspect of the present invention, in the first aspect of the present invention, the head side oil passage has a passage portion that passes through the cooling water between the cylinders in a direction perpendicular to the cylinder row direction.

According to a fourth aspect of the present invention, in the first aspect of the present invention, a control means for controlling the flow rate is provided in the main side oil passage for guiding the lubricating oil from the lubricating oil pump to the crankshaft system.

According to the invention of claim 5, in the invention of claim 4, the control means is built in the engine front cover and the mounting flange of the oil filter is formed in the engine front cover.

According to a sixth aspect of the invention, in the fifth aspect of the invention, an oil passage from the lubricating oil pump to the oil filter and the control means is formed in the engine front cover.

According to the invention of claim 7, in the invention of claim 4, the control means 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.

According to the invention of claim 8, in the invention of claim 7, an oil passage connecting at least the oil filter and the control means is formed in the oil pan or its ladder frame.

[0020]

According to the first aspect of the present invention, the lubricating oil from the lubricating oil pump passes through the head side oil passage formed in or near the cooling water of the cylinder head, so that the cooling water of the cylinder head is efficiently supplied. Heat exchange takes place.

In this case, the lubricating oil passing through the head side oil passage is guided to each part of the valve operating system of the cylinder head, and the surplus lubricating oil is returned to the pump side by the circulation passage provided with the valve means while passing through the head side oil passage. Be done.

Therefore, when the oil temperature is low, such as when the engine is cold, the lubricating oil is quickly heated as the cooling water temperature of the cylinder head rises, and when the oil temperature rises, the cylinder head The proper equilibrium oil temperature is maintained by cooling with cooling water.

In the invention of claim 2, when the oil jet lubrication passage for ejecting the lubricating oil to the piston sliding side is connected to the circulation passage downstream of the valve means, the valve means closes the circulation passage, Since the injection of the oil jet is stopped, it is not necessary to provide a separate control valve for the oil jet.

According to the third aspect of the present invention, when the head side oil passage is formed between the cylinders so as to pass through the cooling water in the direction perpendicular to the cylinder row direction, the change in the cross-sectional area of the cooling water passage of the cylinder head is small. Therefore, a smooth flow of cooling water can be obtained.

According to the fourth aspect of the present invention, when the control means for controlling the flow rate of the lubricating oil from the lubricating oil pump is provided in the main side oil passage for guiding the lubricating oil to the crankshaft system, the required amount of the crankshaft system is determined according to the rotation of the engine. On the other hand, while the lubricating oil can be supplied, a predetermined amount of lubricating oil can be supplied to the head side oil passage even when the engine is running at a low rotation speed where the discharge amount of the lubricating oil pump is not so large.

According to the invention of claim 5, the control means is built in the engine front cover, and the mounting flange of the oil filter is formed on the engine front cover, whereby the lubricating oil pump, the oil filter, the control means and the oil passage are connected. And the structure is simplified.

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

According to the invention of claim 7, the control means 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, so that the control means and the oil filter can be mounted. It will be easier.

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

[0030]

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

FIG. 1 is an oil supply system diagram, 20 is an oil pan,
Reference numeral 21 is a lubricating oil pump. A main gallery 24 and a head gallery 25 on the cylinder head side are connected downstream of the oil filter 23 to the passage 22 on the discharge side of the lubricating oil pump 21 installed on the engine front side.

An orifice 26 and a check valve 27 are provided between the main gallery 24 and the discharge passage 22 as a flow rate control means. A main gallery 24 is extended in parallel with a crankshaft (not shown), and a main bearing of the crankshaft and a supply path 29 connected to the main journal 28 are provided at predetermined positions. Each supply path 2
A guide hole 30 communicating with the shaft 9 is provided in the crankshaft, and is opened on the connecting rod bearing side.

In the head gallery 25, as shown in FIGS. 2 and 3, a passage 33 extending from the engine front side to the engine rear side through the cooling water passage 32 of the cylinder head 31, and following the passage 33. Two passages 34 and 35 extending from the engine rear side to the engine front side through the vicinity of the cooling water passage 32 of the cylinder head 31 are formed.

The passage 33 is formed by disposing a pipe or the like in the cooling water passage 32 of the cylinder head 31 at the position on the intake side, and the passages 34 and 35 are formed by the ports 36 and 37.
It is formed by making a hole in the cylinder head 31 at a predetermined position passing above.

In these passages 34 and 35, a cam journal 38 of a valve train at a position between the cylinders, an oil tube 39 on the cam nose side, an intake valve 40, and an exhaust valve 4 are provided.
1 hydraulic lash adjuster (HLA) 42
Supply paths 43 for supplying the lubricating oil to the respective are formed.

The passages 34 and 35 communicate with each other below the supply passages 39, and the communicating portions 44 are formed between the cylinders so as to cross the cooling water passage 32 in a direction perpendicular to the cylinder row direction. In this case, a cylindrical portion is formed at the time of casting the cylinder head 31, and a hole is formed in the cylindrical portion.
A plug 45 is provided at the hole processing end.

The downstream sides of these passages 34 and 35 are joined on the engine front side and connected to a circulation passage 46. The circulation passage 46 is provided at a position immediately after the passages 34 and 35 merge.
A check valve 47 is provided as a valve means for controlling the amount of circulating oil, and the downstream end of the circulation passage 46 is connected to the suction side of the lubricating oil pump 21.

An orifice 48 is provided in the circulation passage 46 downstream of the check valve 47, and an oil jet passage 49 is branched between the orifice 48 and the check valve 47. An oil jet 50 extending toward the piston sliding side is provided at a predetermined position in each oil jet passage 49 extending in the cylinder row direction.

The circulation passage 46 is connected in the middle of the suction passage 51 of the lubricating oil pump 21 that opens to the oil pan 20, but may be opened to the oil pan 20 near the opening of the suction passage 51.

Due to such a constitution, the lubricating oil pump 21
The lubricating oil discharged from the passage 22 and the oil filter 2
3 is sent to the main gallery 24 and the head gallery 25.

In this case, when the engine rotation is low and the discharge amount of the lubricating oil pump 21 is not so large, the lubricating oil is supplied to the main gallery 24 through the orifice 26 and the like, and the head gallery 25 is mostly lubricated. Oil is supplied. When the rotation of the engine rises and the discharge amount of the lubricating oil pump 21 increases, the check valve 27 is opened and the lubricating oil supplied to the main gallery 24 is increased.

The lubricating oil of the main gallery 24 is supplied to the supply passage 2
It is supplied to the main bearing of the crankshaft and the main journal 28 through 9 and to the connecting rod bearing and the like through the guide hole 30 in the crankshaft, and after lubricating each part, it is returned to the oil pan 20.

On the other hand, the lubricating oil of the head gallery 25 is sent from the engine front side to the engine rear side through the passage 33 formed in the cooling water flow path 32 of the cylinder head 31, and from the engine rear side to the engine front side. It is turned to the side and guided to the passages 34 and 35 passing near the cooling water flow passage 32 of the cylinder head 31.

The lubricating oil introduced into these passages 34 and 35 is
Via the supply path 43 at a predetermined position, the hydraulic crash adjuster 42 of the valve system and the cam journal 3
8 and from the cam tube 39 to the cam nose, the surplus lubricating oil is sent to the circulation passage 46 by the check valve 47 downstream of the passages 34 and 35.

The lubricating oil after operating and lubricating the valve train is returned from the upper deck to the oil pan 2 through the oil drain hole.

That is, the lubricating oil sent to the head gallery 25 passes through the passages 33, 34, and 35 formed in the cooling water of the cylinder head 31 and in the vicinity thereof so that the lubricating oil is sufficiently cooled with the cooling water of the cylinder head 31. While heat exchange is performed, in this case, a predetermined amount of lubricating oil is supplied to the head gallery 25 from a low engine speed, and when the engine speed increases, the head gallery 25 including the surplus lubricating oil is supplied. The amount of lubricating oil supplied is increased. Therefore, proper heat exchange with the cooling water can be obtained.

As a result, when the temperature of the lubricating oil is low, the temperature of the lubricating oil rises rapidly as the temperature of the cooling water of the cylinder head 31 rises, so that the friction during warming up is greatly improved and good warming up is achieved. Performance is secured.

On the other hand, when the lubricating oil temperature is high, it is accurately cooled by the cooling water of the cylinder head 31, so that the lubricating oil temperature does not become too high and the amount of cooling water in the engine is reduced. Alternatively, even in the case of a V-type engine, the proper equilibrium oil temperature is maintained.

The lubricating oil sent to the circulation passage 46 by the check valve 47 is kept at a predetermined pressure by the downstream orifice 48 and is distributed to the oil jet passage 49. It is ejected to the moving side.

Since the oil jet 50 has a normally open structure, when the engine is stopped when the lubricating oil pump 21 is stopped, the lubricating oil in the passages 34 and 35 of the cylinder head 31 escapes from the oil jet 50. The supply of lubricating oil is delayed at the time of starting, and therefore a check valve or the like is required for each oil jet. In this case, the circulation passage 4
The check valve 47 of No. 6 prevents the lubricating oil from coming off.

Further, the passages 34, 3 of the cylinder head 31
A communication portion 44 is provided between the cylinders 5, and the communication portion 44 is formed between the cylinders so as to pass through the cooling water in the direction perpendicular to the cylinder row direction. Therefore, the heat exchange with the cooling water is performed more accurately, the change in the flow passage cross-sectional area of the cooling water flow passage 32 is reduced, and the cooling water flows smoothly through the flow passage 32 without causing stagnant flow. Become. Therefore, the cylinder head 31 can be cooled uniformly, which contributes to the improvement of combustion.

As described above, the present invention can be applied to an engine having a reduced amount of cooling water, a V-type engine, etc., and by reducing the equilibrium oil temperature, each bearing can be made compact, the lubricating oil pump 21 can be made compact, and the valve operating system can be made smaller. It is possible to reduce wear and prevent deterioration of lubricating oil.

FIG. 4 shows another embodiment of the present invention.
An electromagnetic valve 55 is provided instead of the check valve in the circulation passage 46, and this is controlled by the control unit 56.

In this case, the control unit 56 is supplied with detection signals such as the engine speed, the discharge pressure of the lubricating oil pump 21, the lubricating oil temperature, etc., and the opening degree of the solenoid valve 55 is controlled based on these signals. The amount can be finely controlled, proper lubrication suitable for the operating state can be performed, and the amount of lubricating oil to the head gallery 25 can be increased during warm-up to raise the temperature of lubricating oil more quickly.

5 to 8 show examples of mounting and structure when a control valve (control means) is provided at the inlet of the main gallery 24. In this structure, the oil jet passage is independently provided in the head gallery 25 and the main gallery 24.

In the control valve 67, a valve body 70 is slidably housed in a pipe-shaped body 68 as shown in FIG. 7, and a spring 71 urges the valve body 70 toward the front end side. 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 24 formed in the cylinder block 60, as shown in FIGS. 6 and 8, from the crankcase inner wall (skirt inner wall) 61 side to the valve hole 7 is formed.
7 is formed. Skirt 62 in front of valve hole 77
A mounting surface 80 for mounting the oil filter 23 is formed on the outer wall, and an inlet flow path 81 of the oil filter 23 connected to the discharge side passage 22 of the lubricating oil pump 21 and an outlet flow of the oil filter 23 connected to the valve hole 77. Road 82 is opened. The head gallery 25 is branched in the middle of the outlet passage 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 24.

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 24 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 lubricating oil pump 21 is supplied to the inlet passage 81, the oil filter 23 and the outlet passage 82.
Through the head gallery 25 and the control valve 67 side, but the engine rotation is low and the lubricating oil pump 21
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 24 is opened by only 2 so that most of the oil is sent to the head gallery 25 and part of the oil is sent to the main gallery 24.

The engine speed increases and the lubricating oil pump 2
When the discharge amount of 1 increases, the valve body 70 of the control valve 67
Is retreated to open the oil jet passage 66, and oil is also sent to the oil jet passage 66.

As the engine speed further increases,
The main gallery 24 is opened by the retreat of the valve body 70 of the control valve 67, and the oil sent to the main gallery 24 is increased.

Therefore, a predetermined amount of oil is supplied to the head gallery 25 when the engine is running at low speed, and a required amount of oil is supplied to the main gallery 24 and the oil jet passage 66 as the engine speed increases.

In this way, the control valve 67 and the oil filter 23 can be easily attached, and the flow path connection and structure are simplified.

9 to 12 are control valves (control means),
This is an example in which the oil filter 23 is arranged on the engine front cover 87. 9 and 10 show a front side of the front cover 87 and a cutaway cross section thereof, and FIGS. 11 and 12 show a back side of the front cover 87 and a partial cross section thereof.

The lubricating oil pump 21 is arranged substantially in the lower center of the front cover 87, the suction port 88 is formed on the lower peripheral side thereof, and the discharge port 90 is formed on the obliquely upper side 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 20.

A flange portion 94 for attaching the oil filter 23 is formed on the side of the front cover 87 formed on the inclined surface in the front of the discharge port 90 in the flow direction. 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 23 is attached to the flange portion 94.

The outlet passage 96 has a gentle curved passage on the upper side of the discharge port 90 and the lubricating oil pump 21, 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 opened from the side of the front cover 87, and a valve body 98 and a 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 is formed, and these are connected to the connection port 103 with the main gallery 24.

A branch flow passage 105 connected to the connection port 104 with the head gallery 25 is provided in the middle of the outlet flow passage 96.
Are formed.

A return port (relief port) 107 of the circulation passage 46 connected to the downstream of the head gallery 25 is formed below the control valve 86, and the return port 107 is provided with a lubricating oil pump 2 via a relief valve (valve means) 108.
1 suction port 88.

In the relief valve 108, a 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 lubricating oil pump 21.

As shown in FIG. 13, the control valve 8
No. 6 starts to open the port 102 when the discharge pressure of the lubricating oil pump 21 reaches the specified value A, and fully opens the port 102 at the specified value B so that the relief valve 108 is the lubricating oil pump 2
When the discharge pressure of 1 reaches the specified value D, the return port 107 is set to start opening to the suction port 88 of the lubricating oil pump 21.

The oil discharged from the lubricating oil pump 21 is supplied to the inlet passage 95, the oil filter 23, and the outlet passage 96.
Through the branch flow passage 105 and the connection port 104 to the head gallery 25, and via the control valve 86 downstream of the outlet flow passage 96 and the connection port 103 to the main gallery 2.
Sent to 4.

The engine speed is low and the lubricating oil pump 21
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 25 and part of it is supplied to the main gallery
Sent to 4.

When the rotation speed of the engine increases and the discharge amount of the lubricating oil pump 21 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 24 is increased. It

Then, as the engine speed further increases, the discharge amount of the lubricating oil pump 21 increases and the discharge pressure becomes the specified value D.
As described above, the relief valve 108 of the return port 107 connected to the circulation passage 46 connected to the downstream of the head gallery 25 is opened, and the relief oil is returned from the circulation passage 46 to the suction side of the lubricating oil pump 21 via the return port 107.

As a result, a predetermined amount of oil is supplied to the head gallery 25 even when the engine speed is low, a required amount of oil is supplied to the main gallery 24 as the engine speed increases, and the engine speed is high. A large amount of oil is sometimes flushed into the head gallery 25.

By doing so, the installation of the lubricating oil pump 21, the oil filter 23, the control valve 86, etc., and the construction and connection of each flow path become easy, and the structure on the engine front side can be simplified.

14 to 22 show an example in which the control valve (control means) and the oil filter 23 are arranged on the ladder frame 115 of the oil pan 20. FIG. 14 shows an arrangement configuration, and FIGS. 15 to 18 show the front cover portion.
22 shows the ladder frame part.

A lubricating oil pump 21 is arranged substantially in the lower center of the front cover 116, and a suction port 117 is provided on the diagonally lower side of the periphery thereof, and a discharge port 11 is provided on the diagonally upper side of its periphery.
8 is formed.

A pipe 121 is connected to a 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 20.

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 made of aluminum alloy or the like of the oil pan 20 attached to the lower portion of the cylinder block, and the flange portion 124 for attaching the oil filter 23 to the side portion of the ladder frame 115. Is provided.

In the ladder frame 115, the flow path 12 is formed.
3 of the oil filter 23 connected to the inlet passage 125
And the outlet channel 126 are formed, and the oil filter 23
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 front cover 116 is provided downstream of the head side channel 127 and downstream of the main side channel 128, respectively.
Is connected to guideways 135 and 136 formed on the side of the. The guide passage 135 is connected to the head gallery 25 of the cylinder head 31, and the guide passage 136 is connected to the main gallery 24 of the cylinder block via the connecting port 137 and the like.

In the vicinity of the guide path 136, the return port 140 of the circulation path 46 connected to the downstream of the head gallery 25.
(Shifted in FIG. 14) is formed, and the return port 140 is connected to the suction port 117 of the lubricating oil pump 21 via the relief valve 141. The relief valve 141 is formed by forming a valve hole 142 from the lower portion of the front cover 116.

A safety valve 143 that opens when the discharge pressure becomes abnormally high is provided between the discharge port 118 and the suction port 117 of the lubricating oil pump 21.

Incidentally, as shown in FIG. 13, the control valve 11
The relief valve 141 discharges the lubricating oil pump 21 so that when the discharge pressure of the lubricating oil pump 21 reaches the specified value A, 4 starts opening the main side channel 128 and fully opens the main side path 128 at the specified value B. When the pressure reaches the specified value D, the return port 140 is set to start opening to the suction port 117 of the lubricating oil pump 21.

In this way, the structure on the engine front side can be simplified, and the ladder frame 115 made of aluminum alloy or the like, which has good workability, allows the oil filter 23,
The control valve 114 and the like can be installed and connected more easily, and high manufacturability can be secured.

The oil filter 23 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 20.

[0093]

As described above, according to the invention of claim 1,
A head side oil passage is formed that guides the lubricating oil from the lubricating oil pump to the various parts of the valve operating system of the cylinder head through or near the cooling water of the cylinder head, and excess lubricating oil is pumped from this head side oil passage. Since a circulation passage that can circulate is formed on the suction side of and the valve means for controlling the amount of circulating oil is provided in this circulation passage, it is possible to improve warm-up performance and reduce the equilibrium oil temperature at the same time. It can be used for engines with reduced water volume, V-type engines, etc.

According to the second aspect of the invention, the oil jet lubrication passage for ejecting the lubricating oil from the oil jet to the piston sliding side is connected to the circulation passage downstream of the valve means, so that the oil jet is separated from the oil jet. It is not necessary to provide a control valve or the like, and the configuration can be simplified.

According to the third aspect of the present invention, the head side oil passage is provided with a passage portion which passes through the cooling water in the direction perpendicular to the cylinder row direction between the cylinders, whereby the cooling water in the cooling water passage is retained. It can flow smoothly without causing a flow, and can evenly cool the cylinder head.

According to the fourth aspect of the present invention, by providing the flow rate control means in the main side oil passage, the required amount of lubricating oil is supplied to the crankshaft system, and from the low engine speed to the cylinder head side. A predetermined amount of lubricating oil can be supplied, and heat exchange with cooling water can be performed accurately.

According to the invention of claim 5, since the control means is built in the engine front cover and the mounting flange of the oil filter is formed on the engine front cover, the installation of the lubricating oil pump, the oil filter, and the control means is improved. Connection of oil passages becomes easy and the structure is simplified.

According to the sixth aspect of the present invention, in this case, the oil passage from the lubricating oil pump to the oil filter and the control means is formed in the engine front cover, whereby the structure is further simplified.

According to the invention of claim 7, the control means 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. Easy to install.

According to the eighth aspect of the present invention, in this case, at least the oil passage connecting the oil filter and the control means is formed in the oil pan or the ladder frame thereof, so that the structure is further simplified.

[Brief description of drawings]

FIG. 1 is an oil supply system diagram of an embodiment.

FIG. 2 is a sectional view between cylinders of a cylinder head.

FIG. 3 is a sectional view through a combustion chamber of a cylinder head.

FIG. 4 is an oil delivery system diagram of another embodiment.

FIG. 5 is a layout configuration diagram of another embodiment.

FIG. 6 is a mounting view of a control valve.

FIG. 7 is a perspective view of a control valve.

FIG. 8 is a sectional view of a control valve.

FIG. 9 is a front view of a front cover of another embodiment.

FIG. 10 is a partially cutaway sectional view thereof.

FIG. 11 is a rear view of the front cover.

FIG. 12 is a partial cross-sectional view thereof.

FIG. 13 is an operating characteristic diagram of each valve.

FIG. 14 is a layout configuration diagram of another embodiment.

FIG. 15 is a rear view of the front cover.

FIG. 16 is a front view of the pump cover portion.

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

18 is a sectional view taken along line BB of FIG.

FIG. 19 is a front view of the ladder frame.

FIG. 20 is a partial cross-sectional view thereof.

FIG. 21 is a partial side view thereof.

FIG. 22 is a partial side view thereof.

FIG. 23 is a lubrication system diagram of a conventional example.

[Explanation of symbols]

 20 Oil Pan 21 Lubricating Oil Pump 23 Oil Filter 24 Main Gallery 25 Head Gallery 26 Orifice 27 Check Valve 31 Cylinder Head 32 Cooling Water Flow Path 33, 34, 35 Passage 38 Cam Journal 39 Oil Tube 42 Hydraulic Rush Adjuster 43 Supply Passage 44 Communication Part 46 Circulation passage 47 Check valve 48 Orifice 49 Oil jet passage 50 Oil jet 55 Solenoid valve 56 Control unit 66 Oil jet passage 67 Control valve 77 Valve hole 86 Control valve 87 Front cover 88 Suction port 90 Discharge port 94 Flange portion 95 Inlet flow Route 96 Outlet channel 97 Valve hole 98 Valve body 100 Spring 101 Small port 102 Port 105 Branch channel 107 Return port 10 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 passage 128 Main side flow passage 130 Valve hole 131 Spring 132 Valve body 135, 136 Guide path 140 Return port 141 Relief valve 142 Valve hole

Front page continuation (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location F01M 11/03 E F01P 3/20 G F02F 7/00 301 F (72) Inventor Hiroshi Kobayakawa Kanagawa Yokohama City Kanagawa Prefecture 2 Takara-cho, Ward Nissan Motor Co., Ltd.

Claims (8)

[Claims] 1. A head-side oil passage for guiding lubricating oil from a lubricating oil pump to each portion of the valve operating system of the cylinder head through the cooling water of the cylinder head or in the vicinity thereof, and excess lubrication is provided from this head-side oil passage. A lubricating device for an internal combustion engine, characterized in that a circulation passage capable of circulating oil is formed on a suction side of a lubricating oil pump, and valve means for controlling the amount of circulating oil is provided in the circulation passage. 2. The internal combustion engine according to claim 1, wherein an oil jet lubrication passage for ejecting lubricating oil from the oil jet to the piston sliding side is connected to the circulation passage downstream of the valve means. Lubrication device. 3. The lubricating device for an internal combustion engine according to claim 1, wherein the head-side oil passage has a passage portion that passes through the cooling water between the cylinders in a direction perpendicular to the cylinder row direction. 4. The internal combustion engine lubrication device according to claim 1, further comprising a control means for controlling a flow rate in a main side oil passage for guiding the lubricating oil from the lubricating oil pump to the crankshaft system. Lubricator. 5. The lubricating device for an internal combustion engine according to claim 4, wherein the control means is built in the engine front cover, and the mounting flange of the oil filter is formed on the engine front cover. 6. The lubricating device for an internal combustion engine according to claim 5, wherein an oil passage from the lubricating oil pump to the oil filter and the control means is formed in the engine front cover. 7. The lubrication of an internal combustion engine according to claim 4, wherein the control means 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. apparatus. 8. The lubricating device for an internal combustion engine according to claim 7, wherein an oil passage connecting at least the oil filter and the control means is formed in the oil pan or the ladder frame thereof.