JPH07247818A - Lubricating device for internal combustion engine - Google Patents

Abstract

PURPOSE:To attempt compatibility between rapid rising temperature of lubricating oil at the time of a warming engine and reduction of balancing oil temperature at the time of normal operation. CONSTITUTION:A lubricating device is provided with a cylinder head 31 formed a water jacket 32 for circulating cooling water on the upper part of a combustion chamber, and an upper deck 62 for forming a valve system chamber 63 in which a valve system is mounted on the cylinder head 31, grooves 80, 90 which are formed in a recessed shape is formed on joining surfaces 77, 67 which a jointed the cylinder head 31 with the upper deck 62, and heat exchange passages 34, 35 are formed so as to feed, in the vicinity of a water jacket 32, lubricating oil supplied from an oil pump by the grooves 80, 90.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art As a conventional lubricating apparatus for an internal combustion engine, for example, there is one shown in FIG. 11 (see Automotive Technology Handbook, December 1, 1990, Automotive Technology Handbook, Part 1, Volume 53, etc.).

Explaining this, the oil pump 1
The lubricating oil sucked up by the oil pan 2 and discharged is passed through the oil filter 3 and is sent from each gallery 4, 5 to a crankshaft system, a valve operating system arranged in the cylinder head 6, and the like.

The lubricating oil sent to the crankshaft system is
The oil that is supplied to the main bearing and the connecting rod bearing from the oil hole inside the shaft and lubricates them is dropped to the oil pan 2.

Lubricating oil of the head gallery 5 is supplied to the cam nose and the like 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.

The 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.

[0007]

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. Here, since the temperature of the cooling water rises earlier than that of the lubricating oil, if the heat exchange is performed between the cooling water and the lubricating oil, the temperature rise of the lubricating oil can be accelerated.

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 returned to the oil pan 2 from the oil drop hole 13, the lubricating oil is mixed with the cooling water in the cylinder head 6. Although heat exchange is performed, these flows have a low flow velocity and are in a laminar flow state, so efficient heat exchange utilizing cooling water cannot be obtained.

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. That is, if the heat exchange with the cooling water is not good, the lubrication performance in the steady state will decrease.

It is an object of the present invention to provide a lubricating device of excellent practicability, which can achieve both rapid temperature increase of the lubricating oil during warm-up and reduction of the equilibrium oil temperature during steady state.

[0011]

According to a first aspect of the present invention, there is provided a lubricating device for an internal combustion engine, comprising a cylinder head defining a water jacket for circulating cooling water above a combustion chamber, and a valve mechanism on the cylinder head. The upper deck that defines the valve chamber to be housed is formed, the upper deck is divided and formed from the cylinder head, and a groove recessed in a concave shape is formed on the mating surfaces of the cylinder head and the upper deck, which are joined to each other.
The groove defines a heat exchange passage for allowing the lubricating oil sent from the oil pump to flow in the vicinity of the water jacket.

According to a second aspect of the present invention, there is provided a lubricating device for an internal combustion engine according to the first aspect, wherein a heat exchange passage is provided with a circulation passage communicating with the suction side of the oil pump, and the amount of lubricating oil flowing through the circulation passage is reduced. A valve means is provided for adjusting according to operating conditions.

According to a third aspect of the present invention, there is provided a lubricating device for an internal combustion engine according to the first or second aspect, wherein the valve chamber has a cam shaft for opening and closing an intake / exhaust valve, and a cam on the upper deck. A cam bearing that rotatably supports the shaft is formed, and a supply passage that connects the heat exchange passage and the cam bearing to lead the lubricating oil sent from the oil pump to the cam bearing is formed in the upper deck.

According to a fourth aspect of the present invention, there is provided an internal combustion engine lubrication system in which the inlet side heat exchange passage communicating with the discharge side of the oil pump and the suction side of the oil pump are provided. An outlet side heat exchange passage communicating with each other is arranged along the cylinder row direction, a plurality of communication heat exchange passages connecting the inlet side heat exchange passage and the outlet side heat exchange passage are arranged, and the respective communication heat exchange passages are respectively arranged. The cross-sectional area of the flow path is formed so as to increase from the upstream side to the downstream side of the inlet-side heat exchange passage.

[0015]

In the lubricating device for the internal combustion engine according to the first aspect of the present invention, by disposing the heat exchange passage between the cylinder head and the upper deck, the lubricating oil can be circulated in the vicinity of the water jacket. The heat exchange between the cooling water and the cooling water can be promoted. Since the lubricating oil pumped from the oil pump circulates through this heat exchange passage, it is possible to improve the heat exchange efficiency by appropriately increasing the flow velocity to create a turbulent state.

As a result, during warm-up when the temperature of the lubricating oil is low, the temperature of the lubricating oil is rapidly raised by heat exchange with the cooling water, and after warming, the lubricating oil is cooled by heat exchange with the cooling water, so that the proper temperature is maintained. Equilibrium oil temperature is maintained.

In the lubricating device for an internal combustion engine according to a second aspect of the present invention, as the amount of heat generated from the engine to the lubricating oil increases, the amount of lubricating oil flowing from the heat exchange passage into the circulation passage via the valve means increases. As a result, the amount of heat radiated from the lubricating oil to the cooling water increases, and an appropriate equilibrium oil temperature is maintained. Further, the surplus lubricating oil that is not used for lubrication is returned to the oil pump through the circulation passage.

In the lubricating device for an internal combustion engine according to a third aspect of the present invention, the lubricating oil sent from the oil pump to the heat exchange passage is supplied to the cam bearing, so that the valve operating mechanism including the cam shaft can be lubricated. Becomes

In the lubricating device for an internal combustion engine according to a fourth aspect of the present invention, the lubricating oil sent from the oil pump flows from the inlet-side heat exchange passage through the connecting heat-exchange passages into the outlet-side heat-exchange passage and flows therethrough. Due to heat exchange with the cooling water in the process, the temperature of the cooling water gradually approaches.

Since the flow passage cross-sectional area of each communication heat exchange passage is gradually increased from the upstream side to the downstream side of the inlet side heat exchange passage, the amount of lubricating oil passing through each communication heat exchange passage and the cooling of the lubricating oil. Since the temperature difference with water is inversely proportional, the heat exchange rate can be increased and the temperature distributions of the cylinder head and the upper deck can be made uniform.

[0021]

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

FIG. 9 is an oil feeding system diagram. In the figure, 20 is an oil pan for storing lubricating oil, and 21 is an oil pump for sucking up the lubricating oil stored in the oil pan 20 and sending it to each part of the engine under pressure. An oil filter 23 is provided in the passage 22 on the discharge side of the oil pump 21 installed on the engine front side.
A main gallery 24 and a head gallery 25 on the cylinder head side are connected downstream of the.

An orifice 26 and a check valve 27 are provided between the main gallery 24 and the discharge side passage 22. A main gallery 24 extends in parallel with the crankshaft, and a supply passage 29 connected to the main bearing of the crankshaft and the main journal 28 is provided at each predetermined position. A shaft internal oil passage 30 communicating with each supply passage 29 is provided in the crankshaft. Each supply path 29
Lubricating oil introduced from the above is supplied to the bearing of the connecting rod through the oil passage 30 inside the shaft.

As shown in FIGS. 1 to 5, the head gallery 25 includes an inlet side heat exchange passage 34 extending from the engine front side to a rear side of the engine through a vicinity of the water jacket 32 of the cylinder head 31. Water jacket 32 of cylinder head 31 from the rear side
An exit side heat exchange passage 35 extending to the front side of the engine through the vicinity of and the five communication heat exchange passages 44 communicating the heat exchange passages 34 and 35 are formed. Each heat exchange passage 34 and 35 is arranged parallel to the crankshaft, while each communication heat exchange passage 44 is arranged orthogonal to the crankshaft.

The lubricating oil introduced into the inlet side heat exchange passages 34, 35 is supplied to the cam nose from the cam bearing 38 and the cam tube 39 via the supply passage 43 at a predetermined position, and the surplus lubricating oil is It is sent to the circulation passage 46 via the flow rate adjusting valve 47.

The flow rate adjusting valve 47 provided as valve means for adjusting the amount of lubricating oil flowing through the circulation passage 4 is
A valve body for opening and closing 6 and a spring for urging the valve body in the valve closing direction are provided. As the hydraulic pressure acting on the valve increases, the valve body compresses the spring and circulates the circulation passage 46.
The opening area of is increased.

An orifice 48 is provided in the circulation passage 46 downstream of the flow rate adjusting valve 47, and an oil jet passage 49 is branched between the orifice 48 and the flow rate adjusting 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 oil pump 21 opening to the oil pan 20, but may be opened to the oil pan 20 near the opening of the suction passage 51.

An upper deck 62 that defines a valve operating chamber 63 is divided from the cylinder head 31 that defines the combustion chamber 71 and the water jacket 32.

In the valve operating chamber 63, a valve operating mechanism such as two cam shafts for opening and closing the intake / exhaust valves, a valve spring, and a rocker arm is housed.

As shown in FIG. 7, the upper deck 62 has a cam bearing 38 for rotatably supporting the journal portion of each cam shaft, a plug boss 64 for inserting an ignition plug,
It has a hole 66 and the like through which the valve spring is inserted.

The cylinder head 31 includes a lower deck portion 72 defining the combustion chamber 71, intake / exhaust ports 36, 37 opening to the lower deck portion 72, and a water jacket between the lower deck portion 72 and the intake / exhaust ports 36, 37. An upper deck portion 73 defining 32, a valve seat 74 for seating a valve spring, a hole 75 for fitting a valve guide, a joint flange 76 for the head cover, an oil drop hole 79 communicating with the oil pan 20, and the like are provided.

Cylinder head 31 and upper deck 62
Head bolt holes 89 and 99 are formed in each of them.
The head bolts inserted through the head bolt holes 89 and 99 are screwed into the cylinder block, whereby the cylinder head 31 and the upper deck 62 are fastened to the cylinder block.

Upper deck 62 of cylinder head 31
A groove 80 that is recessed in a concave shape is formed in the mating surface 77 that is joined to. On the other hand, a groove 90 that is recessed in a concave shape is formed in the mating surface 67 that is joined to the cylinder head 31 of the upper deck 62. Each groove 80, 90 defines a head gallery 25.

As shown in FIG. 6, the groove 80 formed in the cylinder head 31 is divided into an intake side groove portion 81 which continuously extends from the engine front side to the engine rear side on the intake port 36 side and an exhaust port 37 side. The exhaust-side groove portion 82 is extended and the central groove portions 101 to 105 connecting the intake-side groove portion 81 and the exhaust-side groove portion 82 are provided.

As shown in FIG. 8, the groove 90 formed in the upper deck 62 is continuous with the intake side groove portion 91 which is divided and extends toward the intake port 36 side and the exhaust port 37 side from the engine rear side to the engine front side. It has an intake side groove portion 92 extending in a vertical direction, and central groove portions 111 to 115 connecting the intake side groove portion 91 and the exhaust side groove portion 92.

As a result, between the cylinder head 31 and the upper deck 62, the inlet side heat exchange passage 34 is defined between the intake side groove portions 81 and 91, and the exhaust side groove portions 82 and 91 are formed.
The outlet side heat exchange passage 35 is defined between 92 and 101
A communication heat exchange passage 44 is defined between ˜105, 111 to 115.

As shown in FIG. 4, the intake side groove portion 91 of the upper deck 62 is divided between the intake ports 36.
As a result, the inlet-side heat exchange passage 34 is defined between the mating surface 67 of the upper deck 62 and the intake-side groove portion 81 of the cylinder head 31, and thus is brought close to each intake port 36. The intake side groove portion 81 of the cylinder head 31 is formed so as to be recessed along the two adjacent intake ports 36. As a result, the inlet-side heat exchange passage 34 is brought close to the water jacket 32 defined between the intake ports 36.

As shown in FIG. 5, the exhaust side groove portion 82 of the cylinder head 31 is divided above each exhaust port 37. As a result, the outlet-side heat exchange passage 35 is defined between the exhaust-side groove portion 92 of the upper deck 62 and the mating surface 77 of the cylinder head 31, and thus is kept away from the exhaust port 37.

Each head bolt hole 99 formed in the upper deck 62 has a lower end opening into the groove 90 and an upper end opening into each cam bearing 38. As a result, the supply passage 43 is defined between the head bolt hole 99 and the head bolt. The lubricating oil guided to the head gallery 25 is supplied to the supply passage 43.
Through the cam bearing 38 and the cam tube 39 to the cam nose.

One head bolt hole 89 located on the engine front side communicates with the inlet side heat exchange passage 34 and also with the discharge side passage 22 of the oil pump 21.

The other head bolt hole 89 located on the engine front side communicates with the outlet side heat exchange passage 35, and also communicates with the circulation passage 46 via the flow rate adjusting valve 47.

The communication heat exchange passages 44 connecting the inlet side heat exchange passage 34 and the outlet side heat exchange passage 35 are arranged between the cylinders and at the front and rear cylinder ends. The central groove portions 101 to 105 that define the communication heat exchange passages 44 are formed so that the opening areas of the central groove portions 101 to 105 gradually increase from the engine front side to the engine rear side. Similarly, each communication heat exchange passage 4
The central groove portions 111 to 115 of the groove 90 defining 4 are formed such that the opening areas thereof gradually increase from the engine front side to the engine rear side. As a result, the minimum flow passage area of each communication heat exchange passage 44 gradually increases from the engine front side to the engine rear side.

A casting sand removing hole 78 is formed in the water jacket 32 in the cylinder head 31, and a plug body 65 is inserted in the casting sand removing hole 78. Upper deck 62
A boss 68 that is joined to the open end of the sand removal hole 78 is formed in the. Each of the communication heat exchange passages 44 located between the cylinders is branched so as to bypass the sand removal hole 78 and the boss 68 in the middle thereof.

With the above construction, the operation will be described below.

Lubricating oil discharged from the oil pump 21 is sent to the main gallery 24 and the head gallery 25 through the discharge side passage 22 and the oil filter 23.

Lubricating oil flowing into the main gallery 24 through the orifice 26 and the like passes through the supply passage 29 and the main bearing of the crankshaft and the main journal 28.
To the bearing of the connecting rod, etc. through the internal oil passage 30 in the crankshaft, and after lubricating each part, it is returned to the oil pan 20.

On the other hand, the lubricating oil flowing into the head gallery 25 flows from the engine front side through the inlet side heat exchange passage 34 to the engine rear side, and at the same time from the engine rear side through the outlet side heat exchange passage 35. Flowing to the side. The lubricating oil guided to the heat exchange passages 34 and 35 is supplied to the cam bearing 38 of the valve train and the cam nose from the cam tube 39 via the supply passages 43 at predetermined positions, respectively, and the surplus lubricating oil is supplied. Is the exit side heat exchange passage 3
5 is sent to the circulation passage 46 by a flow rate adjusting valve 47 downstream of 5.

The lubricating oil sent to the circulation passage 46 by the flow rate adjusting 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 sliding side.

Since the oil jet 50 has a normally open structure, if the flow rate adjusting valve 47 is not provided in the middle of the circulation passage 46, the lubricating oil in the passages 33, 34 of the cylinder head 31 is stopped when the engine is stopped when the oil pump 21 is stopped. Will be discharged from the oil jet 50, and the supply of the lubricating oil will be delayed at the time of engine start by the amount of the oil jet being discharged. Therefore, a check valve or the like is required for each oil jet. However, in the case of the present embodiment, since the lubricating oil does not fall out of the circulation passage 46 by the flow rate adjusting valve 47, it is not necessary to provide a check valve or the like for each oil jet.

The lubricating oil after operating and lubricating the valve train is returned to the oil pan 20 from the valve chamber 63 through the oil drop hole 79 opened on the cylinder head 31.

The lubricating oil sent to the head gallery 25 is
In the process of passing through the inlet-side heat exchange passage 34 formed near the water jacket 32, the communication heat exchange passages 44, and the outlet-side heat exchange passage 35, heat is exchanged with the cooling water circulating in the water jacket 32. Be seen.

When the engine having a low lubricating oil temperature is warmed up, the viscosity of the lubricating oil is high, so that the hydraulic pressure of the head gallery 25 increases and the opening degree of the flow rate adjusting valve 47 increases. The opening operation of the flow rate adjusting valve 47 increases the amount of surplus lubricating oil sent to the circulation passage 46 after circulating through the head gallery 25. The lubricating oil that circulates in the head gallery 25 is heated by the cooling water of the water jacket 32 whose temperature rises quickly during warm-up, so that the temperature of the lubricating oil rises faster. In this way, during warm-up, the temperature of the lubricating oil rapidly rises as the cooling water temperature of the cylinder head 31 rises, so that the friction during warm-up is greatly reduced and good warm-up performance is secured. It

When the engine is warmed up and is running at low speed, the viscosity of the lubricating oil is low and the discharge pressure of the oil pump 21 rotating in synchronization with the engine is low, so the flow rate adjusting valve 47 is closed. When the flow rate adjusting valve 47 is closed, the entire amount of the lubricating oil guided to the head gallery 25 is supplied to the cam bearing 38 of the valve train via the supply passage 43 and the cam tube 39.
Supplied to the cam nose. As a result, the lubricity of the valve operating mechanism can be improved without increasing the capacity of the oil pump 21.

When the engine is rotating at high speed, the discharge pressure of the oil pump 21 rises and the opening degree of the flow rate adjusting valve 47 increases. Due to the opening operation of the flow rate adjusting valve 47, the head gallery 2
The amount of surplus lubricating oil sent from 5 to the circulation passage 46 increases. The amount of heat generated by the cooling water and the lubricating oil absorbed from the engine at high speed and high load increases, but the cooling water is radiated to the outside air through the radiator, so that it is kept in a predetermined temperature range. Therefore, even if the heat generation amount of the engine increases, the lubricating oil circulating in the head gallery 25 is kept in a predetermined temperature range by radiating heat to the cooling water of the water jacket 32. As a result, the equilibrium temperature of the lubricating oil can be appropriately maintained without providing an oil cooler or the like for cooling the lubricating oil with the outside air.

The inlet-side heat exchange passage 34 is defined between the mating surface 67 of the upper deck 62 and an intake-side groove portion 81 formed in a concave shape along two adjacent intake ports 36 of the cylinder head 31. By being formed, the inlet side heat exchange passage 34 is brought close to the water jacket 32 defined between the intake ports 36, and the surface area of the inlet side heat exchange passage 34 is increased along the water jacket 32. Heat exchange between the lubricating oil and the cooling water of the water jacket 32 is promoted.

The heat exchange passage 35 on the outlet side is connected to the upper deck 6
2, the mating surface 7 of the exhaust side groove portion 92 and the cylinder head 31
7, the exhaust port 3 is separated from the exhaust port 37 and becomes relatively high in temperature under high load.
It is possible to prevent the lubricating oil from being overheated due to the heat transfer from 7.

The lubricating oil flowing through the head gallery 25 flows from the inlet side heat exchange passage 34 through the connecting heat exchange passages 44 into the outlet side heat exchange passage 35. The temperature of the cooling water gradually approaches due to the heat exchange performed between them.

Since the minimum flow passage area of each communication heat exchange passage 44 gradually increases from the engine front side to the engine rear side, it gradually increases from the upstream side to the downstream side of the inlet side heat exchange passage 34. , The temperature difference between the amount of lubricating oil passing through each communication heat exchange passage 44 and the cooling water of the lubricating oil is inversely proportional, the heat exchange rate can be increased, and the temperature distribution of the cylinder head 31 and the upper deck 62 can be made uniform. Can be converted.

FIG. 10 shows another embodiment of the present invention. An electromagnetic valve 55 is provided in the circulation passage 46 instead of the flow rate adjusting valve 47, and this is controlled by a control unit 56.

In this case, the control unit 56 inputs detection signals such as the engine speed, the discharge pressure of the oil pump 21 and the lubricating oil temperature, and the opening degree of the solenoid valve 55 is controlled based on these detection signals. The amount of lubricating oil 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.

[0062]

As described above, according to the first aspect of the invention, the cylinder head defining the water jacket in which the cooling water circulates is provided above the combustion chamber, and the valve mechanism is housed on the cylinder head. The upper deck that defines the valve operating chamber is formed by dividing the upper head deck from the cylinder head, and a groove recessed in a concave shape is formed on the mating surfaces of the cylinder head and the upper deck that are joined to each other. Since the heat exchange passage that allows the lubricating oil sent from the oil pump to flow near the water jacket is defined, the heat exchange between the lubricating oil and the cooling water is promoted,
The temperature of the lubricating oil is accelerated during warming up, and the lubricating oil is maintained at an appropriate equilibrium temperature after warming up.

According to a second aspect of the present invention, there is provided a lubricating device for an internal combustion engine according to the first aspect, wherein a heat exchange passage is provided with a circulation passage communicating with the suction side of the oil pump, and the amount of lubricating oil flowing through the circulation passage is reduced. Since the valve means for adjusting according to the operating conditions is provided, for example, as the amount of heat generated from the engine to the lubricating oil increases, it becomes possible to increase the amount of lubricating oil flowing through the heat exchange passage, and the appropriate value is set at the equilibrium temperature. Can be maintained.

A lubricating device for an internal combustion engine according to a third aspect is the lubricating device for an internal combustion engine according to the first or second aspect, wherein the valve operating chamber is provided with a cam shaft for opening and closing the intake / exhaust valve, and the upper deck has a cam. A cam bearing that rotatably supports the shaft is formed, and a supply passage that connects the heat exchange passage and the cam bearing to lead the lubricating oil sent from the oil pump to the cam bearing is formed in the upper deck. It is possible to lubricate the valve operating mechanism including the camshaft without complicating.

A lubricating device for an internal combustion engine according to a fourth aspect of the present invention is the lubricating device for an internal combustion engine according to any one of the first to third aspects, wherein an inlet side heat exchange passage communicating with a discharge side of the oil pump and a suction side of the oil pump are provided. An outlet side heat exchange passage communicating with each other is arranged along the cylinder row direction, a plurality of communication heat exchange passages connecting the inlet side heat exchange passage and the outlet side heat exchange passage are arranged, and the respective communication heat exchange passages are respectively arranged. Since the flow passage cross-sectional area is formed so as to increase from the upstream side to the downstream side of the inlet side heat exchange passage, the heat exchange rate can be increased and the temperature distribution of the cylinder head and the upper deck can be made uniform.

[Brief description of drawings]

1 is a cross-sectional view of a cylinder head and an upper deck taken along the line AA of FIG. 6 showing an embodiment of the present invention.

FIG. 2 is a sectional view of the cylinder head and the upper deck, which is also taken along the line BB of FIG.

3 is a sectional view of the cylinder head and the upper deck, which is also taken along the line CC of FIG.

4 is a sectional view of the cylinder head and the upper deck, which is also taken along the line DD of FIG. Fig.

5 is a sectional view of the cylinder head and the upper deck, which is also taken along the line EE of FIG.

FIG. 6 is a plan view of the cylinder head.

FIG. 7 is a plan view of the upper deck as seen from above.

FIG. 8 is a plan view of the upper deck as seen from below.

FIG. 9 is a diagram of oil supply system of the same.

FIG. 10 is an oil delivery system diagram showing another embodiment.

FIG. 11 is a lubrication system diagram showing a conventional example.

[Explanation of symbols]

 20 oil pan 21 oil pump 22 discharge side passage 24 main gallery 25 head gallery 31 cylinder head 32 water jacket 34 inlet side heat exchange passage 35 outlet side heat exchange passage 38 cam bearing 43 supply passage 44 communication heat exchange passage 46 circulation passage 47 flow rate Adjustment valve 55 Solenoid valve 56 Control unit 67 Mating surface 77 Mating surface 80 Groove 90 Groove

Claims (4)

[Claims] 1. A cylinder head that defines a water jacket in which cooling water circulates is provided above a combustion chamber, and an upper deck that defines a valve operating chamber in which a valve operating mechanism is housed is provided on the cylinder head. The upper deck is divided and formed from the cylinder head, and a concave groove is formed on the mating surfaces of the cylinder head and the upper deck that join to each other.By this groove, the lubricating oil sent from the oil pump is placed near the water jacket. A lubricating device for an internal combustion engine, characterized in that a heat exchange passage for circulation is defined. 2. A circulation passage that connects the heat exchange passage to the suction side of the oil pump, and valve means for adjusting the amount of lubricating oil flowing through the circulation passage in accordance with operating conditions. Item 1. A lubricating device for an internal combustion engine according to item 1. 3. A camshaft for opening / closing an intake / exhaust valve in a valve operating chamber, a cam bearing for rotatably supporting the camshaft is formed on an upper deck, and a heat exchange passage and a cam bearing are provided on the upper deck. 3. A lubricating device for an internal combustion engine according to claim 1, further comprising: a supply path that communicates the lubricating oil sent from the oil pump to the cam bearing. 4. An inlet-side heat exchange passage communicating with the discharge side of the oil pump and an outlet-side heat exchange passage communicating with the suction side of the oil pump are arranged along the cylinder row direction to form the inlet-side heat exchange passage. A plurality of communication heat exchange passages communicating with the outlet side heat exchange passages are arranged, and each communication heat exchange passage is formed such that the cross-sectional area of each passage gradually increases from the upstream side to the downstream side of the inlet side heat exchange passage. The lubricating device for an internal combustion engine according to any one of claims 1 to 3, characterized in that.