JPH05306611A - Oil tank of v engine - Google Patents

Abstract

PURPOSE:To provide a simple and miniaturized structure which can improve ability to withdraw oil by forming an oil tank with a plurality of spaces between cylinder banks covered by a cover and by communicating the oil tank and oil pan and a lubricating portion and valve gear chambers respectively. CONSTITUTION:A plurality of spaces between cylinder banks 8-1 and 8-2 are covered by a cover section 36 to form a hermetically sealed oil tank 38. A first passage 42 is arranged to communicate the inside of an oil pan 14 and the oil tank 38 through a first pump 40. A second passage 46 is arranged to communicate the oil tank 38 and each lubricating portion through a second pump 44. On the other hand, a third and fourth passages 50-1 and 50-2 are arranged in a cylinder block to communicate the crank chamber 48 at the lower part of the cylinder block 4 and a first and second valve gear chambers 34-1 and 34-2. A fifth and sixth passages 52 and 54 are arranged to in their respective first and second cylinder heads 6-1 and 6-2 to communicate a first and second valve gear chambers 34-1 and 34-2 and the oil tank 38.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil tank for a V-type engine, and more particularly, to a dry sump in which an oil pan is attached to a lower portion of a cylinder block via a lower case and an oil tank is provided between first and second cylinder banks. System V type engine oil tank.

[0002]

2. Description of the Related Art In motorcycles, outboard motors, or vehicle engines, cylinders arranged in series,
There are those in which cylinders are arranged facing each other, and a V-type engine in which each cylinder bank is arranged in a V shape.

The V-type engine is constructed by mounting first and second cylinder heads on first and second cylinder banks of a V-shaped cylinder block. This first, second
First and second cylinder head covers are attached to the cylinder head.

A crankshaft extending in the longitudinal direction of the engine is rotatably provided at a substantially central portion of the cylinder block. The crankshaft drives a camshaft of a valve train and auxiliary equipment such as a water pump.

As such a V-type engine, there is one disclosed in JP-A-62-32208. An oil tank for a V-type internal combustion engine disclosed in this publication is provided with a volume portion formed in a V space of a cylinder block arranged in a V shape, and a cover for covering the volume portion. An oil tank is formed from the cover and the space is used effectively.

[0006] As a measure for lubricating the engine, a dry sump (dr) that does not contain oil in a sump such as an oil pan is used.
There is a y-sump method and a wet-sump method in which oil is stored in a sump.

In the dry sump system, a dedicated oil tank is installed in a part of the engine room, and the oil tank and the sump are connected by piping. Further, in the wet sump system, which is generally used in a V-type engine, as shown by a two-dot chain line in FIG. 1, a large oil pan 11 is provided under the lower case of the cylinder block.
4 is installed.

[0008]

By the way, in the conventional dry sump type V engine, a dedicated hose and an oil tank are required respectively.

As a result, a space for arranging the hose and the oil tank is required, the space cannot be effectively utilized, and the large number of parts increases the cost, which is economically disadvantageous. ..

Further, in general, when the oil tank is installed on the vehicle body side, vibrations from the engine are directly transmitted to a dedicated hose, which lowers the durability of the hose and also lowers the sealing property of the joint portion. There is an inconvenience of being frightened.

Further, since the hose is relatively long, oil is fed into the hose, resulting in a large flow rate loss, which requires an oil pump having a large discharge performance, resulting in a large cost. It has the disadvantage of being economically disadvantageous.

Furthermore, the above-mentioned JP-A-62-3220.
According to the method disclosed in Japanese Patent Publication No. 8, an oil tank is formed in a V space of an internal combustion engine by using an inner part, a cover and an oil filler cap which are separately formed when forming the oil tank. ing.

As a result, there are inconveniences that the number of parts is increased, the structure is complicated, the manufacture is difficult, the cost is high, and it is economically disadvantageous.

Further, since there is no passage connecting the valve operating system in the cylinder head and the oil tank, all the oil supplied to the valve operating system will flow down into the oil pan, and blow-by gas There are disadvantages that the oil is deteriorated, the service life of the oil is shortened, the frequency of oil replacement is increased, and it is economically disadvantageous.

[0015]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention mounts first and second cylinder heads on a cylinder block of an engine and forms first and second cylinders in a substantially V shape. A bank is provided, first and second cylinder head covers are provided to form first and second valve operating chambers in the first and second cylinder heads, respectively, and an oil pan is provided below the cylinder block via a lower case. In the oil tank of the dry sump type V engine equipped with, a space between the first and second cylinder banks is covered by a cover, and an oil tank having a sealed space is provided inside.
A first passage is provided to connect the inside of the oil pan and the oil tank via a first pump, and a second passage is provided to connect the oil tank and each lubrication part via a second pump. Third and fourth passages that connect the crank chamber and the first and second valve operating chambers to each other are provided in the cylinder block, and the first and second cylinder heads have the first and second valve operating chambers and the oil. The fifth and sixth passages for communicating with the tank are provided respectively.

[0016]

According to the invention as described above, the oil in the first and second valve operating chambers flows down to the crank chamber below the cylinder block through the third and fourth passages, and at the same time, the fifth and sixth operating chambers.
By passing through the passage, it directly flows down to the oil tank, improving the collectability of oil.

[0017]

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

1 to 3 show an embodiment of the present invention. 1 to 3, 2 is a dry sump engine, 4 is a cylinder block, 6-1 and 6-2 are first and second cylinder heads, and 8-1 and 8-2 are first and second.
It is a cylinder bank. The engine 2 includes a substantially V-shaped cylinder block 4 having a first cylinder head 6-1 and a second cylinder head 6-1.
6-2 is mounted and the first and second cylinder banks 8-1 and 8-2 are arranged in a substantially V shape.

A single crankshaft 10 is longitudinally supported by the cylinder block 4 and a lower case 12 is provided at a lower portion thereof.
A shallow oil pan 14 is attached through the. The cylinder block 4 includes first and second cylinders 16-1 and 1-1.
6-2 is provided, and the first and second water jackets 18-1 and 18-2 are provided on the outer circumferences of the first and second cylinders 16-1 and 16-2. The first and second pistons (not shown) are attached to the -1 and 16-2, respectively. These first and second pistons are connected to the crankshaft 10 by first and second connecting rods (not shown), respectively.

The first and second cylinder heads 6-1 and 6
-2, the first and second combustion chambers 20-1 and 20- formed by the cylinder block 4, the first and second cylinder heads 6-1 and 6-2, and the first and second pistons (not shown).
The first and second intake ports (not shown) and the first and second exhaust ports (not shown) communicating with 2 are provided.

First and second intake pipes 22-1 and 22-2 are connected to the first and second intake ports (not shown). The first and second intake pipes 22-1 and 22-2 are upstream of the air cleaner 2 via a throttle body (not shown).
4 has been contacted. Further, first and second exhaust pipes 26-1 and 26-2 are connected to the first and second exhaust ports (not shown).

The first and second cylinder heads 6-1 and 6
-2 includes one first and second cam shaft 28 in the longitudinal direction.
-1, 28-2 are arranged. First and second cam shaft 28
-1, 28-2 are provided with first and second cam portions 30-1, 30-2 having an intake cam and an exhaust cam, respectively. The first and second cam portions 30-1 and 30-2 swing the first and second intake rocker arms and the first and second exhaust rocker arms (not shown).

The first and second cylinder heads 6-
1, 6-2 to the first and second cylinder head covers 32-
1, 32-2 are provided respectively, and the first and second valve operating chambers 3 are internally provided.
4-1 and 34-2 are formed.

A cover portion 36 covers the space between the first and second cylinder banks 8-1 and 8-2 in the V-shape, and an oil tank 38 having a sealed space is provided inside.

The inside of the oil pan 14 and the oil tank 3
8 is provided with a first passage 42 that communicates with the first pump 40, and a second passage 46 that communicates the oil tank 38 and each lubrication part with the second pump 44.
The crank chamber 48 below the cylinder block 4 and the first,
Third and fourth passages 50-1 and 5-5, which respectively communicate with the second valve operating chambers 34-1 and 34-2 and function as oil return passages.
0-2 are provided in the cylinder block 4, and the first and second
The first and second valve operating chambers 3 are provided in the cylinder heads 6-1 and 6-2.
A fifth passage 52 and a sixth passage 54 that connect the oil tanks 4-1 and 34-2 to the oil tank 38 are provided.

More specifically, the oil tank 38 is formed by the outer wall portions 4a and 4b of the first and second cylinder blocks 4 and the cover portion 36 fixed by fixing bolts 56. There is. Then, fins 58-1 and 58-2 protruding inside the oil tank 38 are formed on the outer wall portions 4a and 4b, respectively.

The first pump 40 is disposed in the oil pan 14 and supplies the oil sucked up from the oil strainer 60 to the oil tank 38 via the first passage 42.

The second pump 44 is an oil tank 38.
To the wall 4c of the cylinder block 4 forming the
It is arranged so as to communicate with the oil tank 38 by means of 2, and supplies the oil in the oil tank 38 to the oil filter 64 via the second passage 46, and supplies it to the lubricating parts not shown in the figure via the main gallery 66. is there.

Further, the third passage 50-1 includes a crank chamber 48 below the cylinder block 4 and a first valve operating chamber 34-1.
In order to communicate with the inside of the cylinder block 4, that is, on the side opposite to the side of the outer wall portion 4a forming the oil tank 38.
It functions as an oil return passage through which the oil separated into gas and liquid after flowing into the valve operating chamber 34-1 flows down.

The fourth passage 50-2 is also formed outside the cylinder block 4, that is, on the opposite side of the outer wall portion 4b forming the oil tank 38, like the third passage 50-1. There is.

The fifth passage 52 is formed in the first cylinder head 6-1 to connect the first valve operating chamber 34-1 and the oil tank 38, as shown in FIGS. The sixth passage 54 is formed in the second cylinder head 6-2 so as to connect the second valve operating chamber 34-2 and the oil tank 38.

Since the downstream end of the fourth passage 50-2 is located on the front side in the rotation direction of the crankshaft 10, the fourth passage 50-2 is provided with the fourth end.
A protrusion 68 that projects into the crank chamber 48 is formed near the downstream end of the passage 50-2 in order to eliminate the influence of the rotation of the crankshaft 10.

The first pump 40 includes the first crankshaft sprocket 70 of the crankshaft 10 and the first pump 4
Driven by connecting the first pump sprocket 72 of No. 0 with the first chain 74, and the second pump 44 is driven by the second crankshaft sprocket 76 of the crankshaft 10 and the first and second camshafts 28-1. , 28-2, the second chain 8 to be simultaneously driven by the second chain 80 connecting the first and second camshaft sprockets 78-1, 78-2.
The second pump sprocket 82 is wound around 0.

Next, the operation will be described.

When the engine 2 is driven, the crankshaft 10 rotates, and the first crankshaft sprocket 70 and the second crankshaft sprocket 70
The crankshaft sprocket 76 is rotated.

Then, the first crankshaft sprocket 70
Is transmitted to the first pump sprocket 72 via the first chain 74 to drive the first pump 40, and the oil in the oil pan 14 is sucked up from the oil strainer 60 by the first pump 40. The oil is supplied to the oil tank 38 through the passage 42.

The second crankshaft sprocket 7 is also used.
The rotational force of 6 is transmitted to the first and second camshaft sprockets 78-1 and 78-2 and the second pump sprocket 82 via the second chain 80, and the first and second camshafts 28-1 and 28-1,
28-2 is driven to open / close an intake / exhaust valve (not shown), and the second pump 44 is driven.

The second pump 44 sucks the oil in the oil tank 38 from the communication opening 62, and the second passage 4
It is supplied to each part lubrication site through the oil filter 64 and the main gallery 66 via 6.

When the engine 2 is driven, the first,
The blow-by gas that has reached the inside of the crank chamber 48 from the second combustion chambers 20-1 and 20-2 is separated into gas and liquid in the crank chamber 48, and then passes through the third and fourth passages to the first and second motions. The inside of the valve chambers 34-1 and 34-2 is reached.

Then, the first and second valve operating chambers 34-1, 34
-2 again after gas-liquid separation is carried out, the gas is reduced to the air cleaner 24 of the intake system, and the oil passes through the third and fourth passages 50-1 and 50-2, and the oil pan 14
Although it flows in, a part of the oil flows directly into the oil tank 38 through the fifth passage 52 and the sixth passage 54.

As a result, the space between the V-shaped first and second cylinder banks 8-1 and 8-2 can be used as the oil tank 38, the number of parts can be reduced, and the structure can be simplified. The space for disposing the tank 38 can be omitted, the oil pan 14 can be downsized as compared with the conventional one, the engine can be made compact, and the space can be effectively used, which is practically advantageous.

Further, since the oil in the oil tank 38 is cooled from both sides by the first and second water jackets 18-1 and 18-2 in the cylinder block 4, a good cooling action is exhibited. Therefore, the temperature of the oil can be maintained in an appropriate state, the deterioration of the oil can be prevented, and the durability of the engine can be improved.

Further, since the oil tank 38 is formed between the V-shaped first and second cylinder banks 8-1 and 8-2, a large soundproofing against vibration of the cylinder block when the engine is driven. Anti-vibration effect can be expected,
It can improve usability.

Furthermore, by providing the fifth passage 52 and the sixth passage 54, the first and second valve operating chambers 34-1,
The oil in 34-2 is the third and fourth passages 50-1, 50.
-2 to flow into the oil pan 14, and the fifth passage 52 and the sixth passage 54 cause the oil tank 38 to flow.
Since the blow-by gas is directly flowed in, the contact between the blow-by gas and the oil flowing down through the fifth passage 52 and the sixth passage 54 can be reliably prevented, and the oil deterioration due to the blow-by gas can be prevented.

Also, the fifth passage 52 and the sixth passage 54
By allowing a part of the oil in the first and second valve operating chambers 34-1 and 34-2 to flow directly into the oil tank 38, it is possible to improve the oil recoverability.
It contributes to downsizing of the pump and is practically advantageous.

[0046]

As described in detail above, according to the present invention, the space between the first and second cylinder banks is covered by the cover portion, and the oil tank having the sealed space is provided inside the oil pan and the oil tank. A first passage communicating with the first pump is provided, and a second passage communicating the oil tank with each lubrication part is provided with a second pump. Third and fourth passages for communicating with the valve chambers are provided in the cylinder block, and fifth and sixth passages for communicating the first and second valve operating chambers with the oil tank are provided for the first and second cylinder heads. Since each is provided, the space between the first and second V-shaped cylinder banks can be used as an oil tank, the number of parts can be reduced and the configuration can be simplified, and the installation space for the oil tank can be omitted. Te, can reduce the size of the oil pan than the conventional, the engine obtained a compact, can work to effective use of space. In addition, by forming an oil tank between the V-shaped first and second cylinder banks, it is possible to expect a great soundproofing / vibrationproofing effect against vibration of the cylinder block when the engine is driven. Can improve. Furthermore, by providing the fifth passage and the sixth passage, the oil in the first and second valve operating chambers flows down into the oil pan through the third and fourth passages, and the fifth passage and the sixth passage are provided. As a result, the blow-by gas directly flows down into the oil tank, so that the contact between the blow-by gas and the oil flowing down through the fifth passage and the sixth passage can be reliably prevented, and the oil deterioration due to the blow-by gas can be prevented. Furthermore,
Since the fifth passage and the sixth passage allow a part of the oil in the first and second valve operating chambers to flow directly into the oil tank, it is possible to improve oil recovery and reduce the size of the first pump. And is practically advantageous.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of an essential part of an oil tank portion of a V-type engine showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of a V-type engine.

3 is a cross-sectional view taken along the line 〓-〓 of FIG.

[Explanation of symbols]

 2 engine 4 cylinder block 6-1, 6-2 1st, 2nd cylinder head 8-1, 8-2 1st, 2nd cylinder bank 10 crankshaft 12 lower case 14 oil pan 16-1, 16-2 1st , 2nd cylinder 18-1, 18-2 1st, 2nd water jacket 32-1, 32-2 1st, 2nd cylinder head cover 34-1, 34-2 1st, 2nd valve operating chamber 36 cover part 38 Oil tank 40 1st pump 42 1st passage 44 2nd pump 46 2nd passage 48 Crank chamber 50-1, 50-2 3rd, 4th passage 52 5th passage 54 6th passage 74 1st chain 80 2nd Chien

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] June 16, 1992

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

Claims (1)

[Claims] 1. A first and a second cylinder head are mounted on a cylinder block of an engine, first and second cylinder banks are arranged in a substantially V shape, and first and second cylinder heads are provided on the first and second cylinder heads. In the oil tank of the V-type engine of the dry sump system in which the first and second cylinder head covers are respectively arranged to form the two valve operating chambers, and the oil pan is attached to the lower portion of the cylinder block via the lower case, A cover portion covers the space between the second cylinder banks, an oil tank having a sealed space is provided inside, a first passage that connects the inside of the oil pan and the oil tank through a first pump is provided, and the oil tank and each part are lubricated. A second passage is provided for communicating with the portion via a second pump, and a second passage for communicating the crank chamber under the cylinder block with the first and second valve operating chambers Third and fourth passages are provided in the cylinder block, and the first and second cylinder heads have first and second passages.
An oil tank for a V-type engine, characterized in that fifth and sixth passages for connecting the valve operating chamber and the oil tank are provided respectively.