JP2000179320A - Diesel engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide good lubrication for a fuel injection cam and a driven portion of a fuel injection pump abutting against the fuel injection cam by means of a simple structure with no additional parts. SOLUTION: In a space between a cylinder 15 and a fuel injection pump chamber 28 inside a cylinder block 26, an oil passageway 30 is formed, one end of which communicates with a rocker chamber 25 and the other end of which opens to a location above a fuel injection cam 8a housed in a fuel injection pump chamber 28. Oil supplied into the rocker chamber 25 as a result of an oil pump being driven is fed through the oil passageway 30 down onto the fuel injection cam 8a, thereby lubricating the fuel injection cam 8a and a driven portion of a fuel injection pump 29 abutting against the fuel injection cam 8a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diesel engine, and more particularly to a fuel injection cam for driving a fuel injection pump and a driven portion of the fuel injection pump which is in contact with the fuel injection cam. Related to diesel engines.

[0002]

2. Description of the Related Art An example of a conventional diesel engine is shown in FIG.
It will be described based on. A crankcase 2 and a fuel injection pump casing 3 are formed integrally with the cylinder block 1. Oil pan 4 at the bottom of crankcase 2
Is fixed, and a portion surrounded by the oil pan 4 and the crankcase 2 is a crankcase 5. A crankshaft 6 is rotatably supported in the crank chamber 5, and an intake / exhaust camshaft 7 and a fuel injection camshaft 8 are rotatably provided diagonally above the crankshaft 6. Intake and exhaust camshaft 7
Are disposed in an intake / exhaust cam chamber 9 communicating with the crank chamber 5, and the fuel injection cam shaft 8 is connected to the fuel injection pump casing 3.
It is disposed in a fuel injection pump chamber 10 formed therein.

The three axes of the crankshaft 6, the intake / exhaust camshaft 7, and the fuel injection camshaft 8 are arranged in parallel, and the ends thereof are the crank chamber 5, the intake / exhaust cam chamber 9, and the fuel injection pump chamber 10 respectively.
And protrudes to the outside, and the protruding portion is covered by a gear case (not shown). In this gear case,
A crank gear 11 fixed to an end of the crank shaft 6,
Intake and exhaust cam gear 12 fixed to the end of intake and exhaust camshaft 7
And a fuel injection cam gear 13 fixed to the end of the fuel injection cam shaft 8 and an idle gear 14 meshed with each of the gears 11 to 13 are housed.

[0004] A cylinder 15 is formed in an upper portion in the cylinder block 1, and a piston 16 is formed in the cylinder 15.
Are reciprocally slidably accommodated. The piston 16 and the crankshaft 6 are connected by a connecting rod 17. Cylinder 15 in cylinder block 1
Is formed with a water jacket 18.

[0005] A fuel injection pump 19 is mounted in the fuel injection pump chamber 10.
Roller 20 and the fuel injection cam 8a fixed to the fuel injection cam shaft 8 are in contact with each other.

A cylinder head 21 is fixed to an upper part of the cylinder block 1, and a rocker cover 22 is fixed to an upper part of the cylinder head 21. Cylinder head 2
1 is provided with an intake / exhaust valve 23 and a rocker cover 2.
A locker chamber 25 containing a rocker arm 24 and the like is formed in 2.

An oil pump (not shown) driven by a crankshaft 6 is attached to an outer peripheral portion of the crankcase 2. The oil pump sucks up oil in an oil pan 4 and moves the oil in the crank chamber 5. It is supplied to the locker room 25.

[0008] In such a diesel engine,
In order to accurately control the fuel injection amount and the fuel injection timing during a long operation, lubrication of the contact portion between the fuel injection cam 8a and the roller 20 of the fuel injection pump 19 is performed well,
It is necessary to prevent wear at the contact portion.

[0009]

In the diesel engine shown in FIG. 2, the crank chamber 5 is communicated with the interior of the gear case, and further, the interior of the gear case is communicated with the fuel injection pump chamber 10, so that the interior of the crank chamber 5 is closed. The mist-like oil generated in the above is guided into the fuel injection pump chamber 10 through the gear case. For this reason, the supply amount of oil into the fuel injection pump chamber 10 tends to be insufficient, so that the contact portion between the fuel injection cam 8a and the roller 20 of the fuel injection pump 19 cannot be sufficiently lubricated.

The lubricating performance can be enhanced by directly guiding the oil supplied by the oil pump into the fuel injection pump chamber 10. However, new piping parts and the like are required, which increases costs.

Further, if oil is stored in the fuel injection pump chamber 10 and this oil is scraped up by the fuel injection cam 8a, lubrication performance can be improved. However, the output loss is caused by the scraping of the oil, and further, by repeatedly scraping the oil, the temperature of the oil rises and the lubricating performance decreases.

Accordingly, the present invention provides a diesel engine capable of satisfactorily lubricating a fuel injection cam and a driven portion of a fuel injection pump in contact with the fuel injection cam with a simple structure without adding new parts. The purpose is to provide.

Further, the present invention provides a diesel engine capable of satisfactorily lubricating a fuel injection cam and a driven portion of a fuel injection pump in contact with the fuel injection cam without increasing the size of the diesel engine. The purpose is to:

Further, the present invention suppresses a rise in the temperature of oil for lubricating the fuel injection cam and the driven portion of the fuel injection pump which is in contact with the fuel injection cam, so that the diesel can be more favorably lubricated. The purpose is to provide an engine.

[0015]

According to the first aspect of the present invention,
A fuel injection pump chamber in which a fuel injection pump and a fuel injection camshaft for driving the fuel injection pump are housed is formed in a cylinder block, and a locker chamber is provided above the cylinder block. In a diesel engine provided with an oil pump for supplying, between the cylinder and the fuel injection pump chamber in the cylinder block, one end is communicated with the locker chamber and the other end is the fuel injection in the fuel injection pump chamber. An oil passage opening above the fuel injection cam fixed to the camshaft was formed.

Accordingly, the oil supplied into the locker chamber by the driving of the oil pump flows down onto the fuel injection cam through the oil passage. Therefore, lubrication between the fuel injection cam and a driven portion of the fuel injection pump that is in contact with the fuel injection cam is favorably performed. In addition, an oil passage communicating the rocker chamber and the fuel injection pump chamber is formed in the cylinder block, and the structure is simple without increasing the number of parts.

According to a second aspect of the present invention, in the diesel engine according to the first aspect, the fuel injection pump is mounted such that an upper end thereof is inclined in a direction away from a cylinder in the cylinder block.

Accordingly, a space for forming an oil passage between the cylinder and the fuel injection pump chamber in the cylinder block is secured, and the oil passage is provided between the cylinder and the fuel injection pump chamber in the cylinder block. Even if it is formed, an increase in the width of the diesel engine can be suppressed.

According to a third aspect of the present invention, in the diesel engine according to the first or second aspect, a water jacket is formed between the cylinder and the oil passage in the cylinder block.

Therefore, when oil flows down through the oil passage, it is prevented from being heated by the heat from the cylinder by the water in the water jacket. For this reason, the temperature rise of the oil supplied into the fuel injection pump chamber is suppressed, and the oil is used to lubricate the fuel injection cam and the driven portion of the fuel injection pump that is in contact with the fuel injection cam. .

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIG. Note that the same portions as those described in FIG. 2 are denoted by the same reference numerals, and description thereof is omitted. The crankcase 2 and the fuel injection pump casing 27 are formed integrally with the cylinder block 26. A fuel injection pump chamber 28 is formed in the fuel injection pump casing 27, and the fuel injection camshaft 8 and the flange type fuel injection pump 29 are arranged in the fuel injection pump chamber 28.
The fuel injection cam shaft 8 is rotatably supported, and the fuel injection cam 8a is fixed. The fuel injection pump 29 has a cylinder 1 whose upper end is formed in the cylinder block 26.
5 is attached in a direction away from 5.

A cylinder head 21 is fixed to an upper portion of the cylinder block 26, and a rocker cover 22 is fixed to an upper portion of the cylinder head 21. The cylinder block 26 and the cylinder head 21 have an oil passage 30 having one end communicating with a locker chamber 25 formed in the rocker cover 22 and the other end opening above the fuel injection cam 8 a in the fuel injection pump chamber 28. Is formed.

The water jacket 18 is formed in the cylinder block 26 between the cylinder 15 and the oil passage 30.

An oil pump (not shown) driven by a crankshaft 6 is attached to an outer peripheral portion of the crankcase 2. The oil pump sucks up oil in the oil pan 4 and moves the oil in the crank chamber 5. It is supplied to the locker room 25.

In such a configuration, by starting the diesel engine, the oil pump is driven, and the oil in the oil pan 4 is supplied to the crank chamber 5 and the rocker chamber 25. The oil supplied into the locker chamber 25 lubricates the rocker arm 24 and the like housed in the locker chamber 25, and then flows down onto the fuel injection cam 8a through the oil passage 30. For this reason,
The lubrication between the fuel injection cam 8a and the roller 20, which is the driven part of the fuel injection pump 29 abutting on the fuel injection cam 8a, can be satisfactorily performed.

When the diesel engine is started after not operating for a long period of time, the locker room 2 is started together with the start.
5 is supplied to the oil passage 5, and immediately thereafter, the oil passage 3
The oil is supplied to the fuel injection pump chamber 28 through the inside of the cylinder 0, and the lubrication between the fuel injection cam 8a and the roller 20 abutting on the fuel injection cam 8a is started immediately.

In this diesel engine, the fuel injection pump 19 is mounted so that its upper end is inclined away from the cylinder 15. Therefore, the cylinder 15 and the fuel injection pump chamber 2 in the cylinder block 26 are mounted.
8, a space for forming the oil passage 30 can be secured. For this reason, even if the oil passage 30 is formed between the cylinder 15 and the fuel injection pump chamber 28 in the cylinder block 26, an increase in the lateral width of the diesel engine can be suppressed.

In this diesel engine, since the water jacket 18 is formed between the cylinder 15 and the oil passage 30 in the cylinder block 26, when the oil flows down through the oil passage 30 from the cylinder 15, Can be prevented from being heated by the heat of. Therefore, a rise in the temperature of the oil supplied into the fuel injection pump chamber 28 is suppressed, and the oil can be used to lubricate the fuel injection cam 8a and the roller 20 more favorably.

[0029]

According to the diesel engine of the first aspect of the present invention, one end is communicated with the locker chamber and the other end is housed in the fuel injection pump chamber between the cylinder and the fuel injection pump chamber in the cylinder block. Since the oil passage opening above the fuel injection cam formed is formed, the oil supplied to the locker chamber by the driving of the oil pump can flow down onto the fuel injection cam through the oil passage, whereby the fuel Lubrication between the injection cam and a driven portion of the fuel injection pump that contacts the fuel injection cam can be favorably performed. Moreover, structurally, an oil passage communicating the rocker chamber and the fuel injection pump chamber is formed in the cylinder block, so that a new component is not required and a simple structure can be achieved.

According to the second aspect of the present invention, in the diesel engine according to the first aspect, the fuel injection pump is mounted so that its upper end is inclined away from the cylinder in the cylinder block. A space for forming an oil passage can be secured between the fuel injection pump chamber and the fuel injection pump chamber. Even if an oil passage is formed in the cylinder block, an increase in the width of the diesel engine can be suppressed.

According to the third aspect of the present invention, in the diesel engine according to the first or second aspect, since a water jacket is formed between the cylinder and the oil passage in the cylinder block, the oil passes through the oil passage. It is possible to prevent the water in the water jacket from being heated by the heat from the cylinder when flowing down. Therefore, a rise in the temperature of the oil supplied into the fuel injection pump chamber can be suppressed, and the lubrication between the fuel injection cam and the driven portion of the fuel injection pump abutting on the fuel injection cam can be further improved. It can be carried out.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view showing a diesel engine according to an embodiment of the present invention.

FIG. 2 is a vertical sectional front view showing a conventional diesel engine.

[Explanation of symbols]

 8a Fuel injection cam 15 Cylinder 18 Water jacket 25 Locker chamber 26 Cylinder block 28 Fuel injection pump chamber 29 Fuel injection pump 30 Oil passage

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) F02M 39/02 F02M 39/02 D 59/44 59/44 J F-term (reference) 3G013 AA04 BA03 BB14 BC28 BD07 BD11 BD42 DA15 3G024 AA36 AA38 BA23 BA29 CA05 DA02 DA08 FA07 3G066 AA07 AB02 AC06 AD02 AD12 BA29 BA65 CA01S CD07 CE02

Claims (3)

[Claims] 1. A fuel injection pump chamber containing a fuel injection pump and a fuel injection cam for driving the fuel injection pump is formed in a cylinder block, and a locker chamber is provided above the cylinder block. In a diesel engine provided with an oil pump that supplies oil to a room, one end is communicated with the locker chamber and the other end is the fuel injection pump chamber between the cylinder and the fuel injection pump chamber in the cylinder block. 3. A diesel engine according to claim 1, wherein an oil passage opening above the fuel injection cam is formed. 2. The diesel engine according to claim 1, wherein the fuel injection pump is mounted so that an upper end thereof is inclined in a direction away from a cylinder in the cylinder block. 3. The diesel engine according to claim 1, wherein a water jacket is formed between the cylinder and the oil passage in the cylinder block.