KR20150120655A - A CLEAN Engine With Simple Connection Structure of High Pressure Fuel Oil Supply Line - Google Patents

Abstract

The present invention relates to a supply line structure which supplies high pressure fuel oil delivered from a fuel spray pump of a clean engine to a fuel spray valve. According to the present invention, a clean engine having a simple connection structure of a high pressure fuel oil supply line comprises: a first insertion hole (62) disposed adjacent to a fuel spray pump (10), and formed from an outside of a cylinder head (6) into the cylinder head (6); a second insertion hole (62a) drilled towards the fuel spray valve whose one end is connected to the first insertion hole (62); a body (102) fixated on an upper end of the fuel spray pump (10), and connected to a delivery hole of the fuel spray pump (10); a connection block (100) extended from a head unit (104) of the body (102) to be inserted into the first insertion hole (62) of the cylinder head (6), having a first insertion shaft (106) wherein a first supply passage (110) as a fuel oil passage connected to the delivery hole of the fuel spray pump (10) is formed; and a second insertion shaft (200) wherein an end thereof intersects with the first insertion shaft (106) of the connection block (100) to be connected to the first insertion shaft (106) and inserted into the second insertion hole (62a), and a second supply passage (202) connected to the first supply passage (110) of the connection block (100) to transport the fuel oil to the fuel spray valve formed therein. As there is no connection unit mechanically connecting a member playing a role of a passage of the fuel oil, the present invention reduces a cumulative tolerance and an assembling error during manufacturing process, and reduces assembling time. In addition, as the high pressure fuel line infiltrates into the cylinder head, an external structure of the engine is simplified.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a clean engine having a connection structure of a simple high-pressure fuel oil supply line,

The present invention relates to a structure of a high-pressure fuel supply line of a diesel engine, and more particularly, to a structure of a high-pressure fuel supply line of a diesel engine, in which a supply line for supplying high-pressure fuel oil discharged from a fuel injection pump to a fuel injection valve To a clean engine having a connection structure of a high-pressure fuel supply line.

In general, ship propulsion, offshore plant, and onshore plant have limited space for installation of engine structures, while additional space for additional structures and facilities, including platform structures for maintenance and repair of engines There is a difficulty.

For example, since the cargo loading space must first be secured on the ship, the space of the engine room for installing powertrain and platform structures such as the engine and the speed reducer must be narrowed, which is more so in the case of a small ship.

Therefore, modern and future engine facilities must solve the problems of improving the efficiency in terms of output and fuel efficiency, and reducing the size of the engine structure and the auxiliary facilities. Also, where there is a separate engine room space, such as a ship, which is shielded from the outside, the ease of assembly and maintenance of the engine and its accessories, and the prevention of fire and accident are also important.

In order to actively cope with these technical demands and customers' needs, the so-called 'Clean Engine' (C-Customer, L-Liability, E-Environment, A-Acceptable and N-No defect) It is a new concept engine introduced by.

In short, the clean engine maintains or even improves the engine efficiency in the same manner as the conventional engine, and provides engine assistance including the engine and the lubricant circulation system, the cooling water circulation system, the intake system, the exhaust system, the pump, the blower, The devices are reasonably reconstructed through modularization, integration, miniaturization and simplification, functionally enhancing the circulation or supply piping and passages of cooling water, lubricating oil and fuel, aligning them neatly and neatly together therewith, To simplify the internal and external structure of the engine, and to assemble, disassemble and maintain the structure including the engine and its accessories, and to keep the inside of the engine and the engine room clean at all times to provide a comfortable engine room for the operator Which is the engine that has been developed to be focused on.

From the viewpoint of the clean engine, the structure of the fuel supply line for supplying the high-pressure fuel from the fuel injection pump to the fuel injection valve of the cylinder head will be described.

1 is a perspective view of an engine showing a fuel supply line to a fuel pump and a cylinder head in the past.

1, the diesel engine includes an engine block 2 having a cylinder bore corresponding to the number of cylinders, a cylinder liner 4 inserted into each cylinder bore of the engine block 2, And a cylinder head 6 mounted on the cylinder liner 4.

A combustion chamber is formed between the upper portion of the cylinder liner 4 and the lower surface of the cylinder head 6. The inside of the cylinder head 6 injects diesel fuel oil (e.g., Heavy Fuel Oil, Marine Diesel Oil) (Fuel Injection Valve) is installed.

The fuel injected from the fuel injection pump 10 to the fuel injection valve is supplied to the fuel injection valve through a fuel injection pump 10, The high-pressure fuel oil supply line.

1, in the conventional high-pressure fuel oil supply line, one end of the connecting block 11 is mounted on the upper portion of the fuel injection pump 10 through a fastening hole 11a, 11 is fixed to the side surface portion 6a of the cylinder head 6 through the fastener 16.

One end of the connecting block 11 is connected to the upper portion of the fuel injection pump 10 and the other end is connected to the side portion 6a of the cylinder head 6 so that the fuel injection pump 10 and the cylinder head 6 To the supply passage. The supply passage formed inside the cylinder head 6 is connected to the inlet of the fuel injection valve so as to supply the fuel to the fuel injection valve.

Since the high-pressure fuel oil discharged from the fuel injection pump is very high at about 200 to 400 kgf / cm 2, if there are many connecting parts, the cause of leakage of the high-pressure fuel also increases accordingly.

Conventionally, the connecting block 11 is provided with a contact-type connecting portion which is in contact with the fuel injection pump 10 in the vertical direction so as to come in close contact with each other, and the contact- exist. Since the connection block 11 is constrained by the three-dimensional vertical structure, it is difficult to precisely align the connection block 11 with the alignment, and it is difficult to correct the error when the error between the components occurs.

For example, a cumulative tolerance necessarily occurs depending on the positional tolerance with respect to the height and the distance at which the connection block 11 is assembled to the fuel injection pump 10 and the side surface portion 6a of the cylinder head 6, do.

Therefore, it is difficult and time-consuming to correct the assembly error to prevent fuel leakage during the assembly process.

Open Patent Publication No. 10-2002-0044596 (Jun. 19, 2002)

SUMMARY OF THE INVENTION The present invention has been made in an effort to solve the above problems, and it is an object of the present invention to provide a fuel supply system for a fuel injection valve, And a clean engine having a connection structure of a high-pressure fuel supply line.

In order to achieve the above object, the connection structure of the high-pressure fuel oil supply line of the clean engine according to the present invention is characterized in that a high-pressure fuel oil supply line for supplying fuel oil from the fuel injection pump to the fuel injection valve of the cylinder head is formed, 1. An engine, comprising: a first insertion hole formed adjacent to the fuel injection pump from the outside to the inside of the cylinder head; A second insertion hole communicating with the first insertion hole at one end thereof and being punched toward the fuel injection valve; A body fixed to an upper end of the fuel injection pump and connected to a discharge port of the fuel injection pump, and a second insertion hole extending from the head portion of the body and inserted into the first insertion hole of the cylinder head, A connecting block having a first insertion shaft in which a first supply passage as a fuel oil passage is formed; And a second supply passage connected to the first supply passage of the connection block to send the fuel oil to the fuel injection valve, wherein the second supply passage is connected to the first insertion hole of the connection block, And a second insertion axis in which a passage is formed.

In the clean engine according to the present invention, it is preferable that the first insertion shaft of the connection block integrally extends from the head portion to form a single body without a connection portion with the head portion.

In the clean engine according to the present invention, it is preferable that a protrusion formed by further projecting the side body to the outside is formed on the side surface of the cylinder head, and a first insertion hole is formed in the protrusion to insert the first insertion shaft of the connection block Do.

Here, a connection groove of a spherical surface is formed around the first insertion axis of the connection block, and a spherical connection protrusion is formed on the distal end of the second insertion shaft and is connected to the connection groove of the spherical surface of the first insertion shaft, It is preferable that the pressing screw is fastened from the outside to the inside of the cylinder head so that the tip end of the pressing screw presses the first insertion shaft to apply pressure to the connection protrusion of the spherical surface and the connection groove of the spherical surface.

In addition, the cylinder head of the portion to which the pressure screw is fastened is provided with a through-hole penetrating through the first insertion hole from the outside, and a fastening block having a female screw portion at the center is provided at a portion where the through- And the male screw portion of the screw is fastened to the female screw portion of the fastening block.

According to the clean engine of the present invention, the first insertion axis is extended from the connection block, and the first inserted axis inserted into the cylinder head is inserted into the cylinder head. On the other hand, the first insertion axis and the second insertion axis are connected There are only two contact-type (or close-contact) connecting portions between the fuel injection pump and the second insertion shaft, and there is no connecting portion mechanically connecting the member serving as the passage of the fuel oil .

Therefore, the cumulative tolerance in the manufacturing process is small, the deviation in the assembling process can be reduced, and the correction of the assembling error for preventing fuel leakage is easy and the assembling time is shortened.

In addition, since the first insertion shaft and the second insertion shaft constituting the high-pressure fuel line have a structure in which they are embedded (or embedded) in the cylinder head, the pipes for feeding the fuel oil do not need to be arranged outside the engine, .

1 is a sectional view of a conventional engine.
2 is a perspective view of a main part showing a connection structure of a high-pressure fuel oil supply line according to the present invention.
FIG. 3 is a front view of FIG. 2, which is based on what is seen in the 'A' direction of FIG.
FIG. 4 is a side view of FIG. 2, and is a view based on what is seen in the direction of 'B' in FIG. 3 and the direction of 'B' in FIG.
5 is a cross-sectional view taken along line CC in Fig.
6 is a cross-sectional view taken along line DD of Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 to 4 illustrate an external structure of a high-pressure fuel oil supply line according to the present invention. FIG. 2 is a perspective view of the main part. FIG. 3 is a front view and FIG. 4 is a side view.

2 to 4, the high-pressure fuel oil supply line according to the present invention is characterized in that the fuel line connected from the fuel injection pump 10 is not installed outside the cylinder head 6 but inside the cylinder head 6 And is connected to a passage through the fuel injection valve in the cylinder head 6. [ According to this structure, as described below, the high-pressure fuel line is submerged in the cylinder head 6 to simplify the external structure of the engine. In particular, the connection points of the high-pressure fuel lines are reduced, It becomes convenient.

At the upper end of the fuel injection pump 10, a connection block 100 is installed. The connection block 100 has a body 102, a head portion 104, and a first insertion axis 106.

The body 102 is fixed to the upper end of the fuel injection pump 10 and connected to a delivery port of the fuel injection pump 10 so that the fuel oil fed from the fuel injection pump 10 is ultimately supplied to the cylinder head 6, To the fuel injection valve of the engine. In the drawing, the fastener 102 fixes the flange-shaped body 102 of the connecting block 100 to the upper end of the fuel injection pump 10.

The head portion 104 has a shape protruding upward from the body 102 as a part of the body 102 of the connection block 100.

The first insertion shaft 106 extends from the head portion 104 and is inserted into the cylinder head 6 and a passage for passing the fuel oil through the delivery port of the fuel injection pump 10 to the fuel injection valve is formed therein .

In the embodiment shown in the drawings, in order to insert (penetrate) the first insertion shaft 106 of the connecting block 100 into the cylinder head 6, the side portion 6a of the cylinder head 6 is provided with a body And the first insertion shaft 106 of the connection block 100 is inserted into the protrusion 60 of the connection block 100. [ It is also possible to replace the fuel injection pump 10 or the connection block 100 and insert the fuel injection pump 10 or the connecting block 100 into the cylinder head 6 without the projections 60 instead of forming the projections 60. [

The first insertion shaft 106 of the connecting block 100 inserted in the cylinder head 6 is connected to a passage extending from the inside of the cylinder head 6 to the fuel injection valve ).

The first insertion axis 106 and the second insertion axis 200 of the connection block 100 are connected by pressing the first insertion axis 106 with the second insertion axis 200 by the pressing screw 160 (To be described later with reference to Figs. 5 and 6).

A fastening block 140 is provided on the protruding portion 60 of the cylinder head 6 for fastening the pressure screw 160 and the pressure screw 60 is screwed to the fastening block 140 to provide tightening force . The fastening block 140 is secured to the projection 60 by a stud 142 and a nut 144.

5 and 6 show an internal structure of a high-pressure fuel oil supply line according to the present invention. FIG. 5 is a cross-sectional view taken along the line CC of FIG. 4. FIG. 6 is a cross- Respectively.

5 and 6, the connection block 100 is connected to the delivery port of the fuel injection pump 10 through a spherical protrusion 104a at the lower end of the body 102. As shown in FIG.

A passage for feeding fuel oil passing through the first insertion shaft 106 from the body 102 of the connection block 100 through the head portion 104 is formed and the pressure transmission passage is formed in the cylinder head 6 And is connected to the inserted second insertion axis 200.

In the embodiment shown in the drawing, the passage formed inside the connection block 100 includes a first connection passage 108, a first supply passage 110, and a second connection passage 112 The fuel injection pump 10 may be connected to the second insertion shaft 200 through a delivery port of the fuel injection pump 10. In this specification, the first supply passage 110 extends to the second insertion shaft 200 while communicating with the delivery port of the fuel injection pump 10 (communicating through the first connection passage 108) (Communicating through the second connection passage 112). When drilling the first supply passage 110, the drill is punched out of the head portion 104 of the connection block 100 as shown in the figure, and then the inlet portion is plugged with the plug 110a.

According to a preferred embodiment of the present invention, it is preferable that the first insertion axis 106 extends integrally from the head part 104 to form a unitary body without a connection part with the head part 104. The first insertion shaft 106 may be formed as a separate member and connected to the head 104. However, in order to further reduce the connection point, it is more preferable that the first insertion axis 106 extends from the head 104 as a single body as shown in the drawings.

A first insertion hole 62 for inserting the first insertion shaft 106 of the connecting block 100 is formed from the outside of the cylinder head 6 and more specifically the projecting portion 60 of the cylinder head 6 And a second insertion hole 62a communicating with the first insertion hole 62 and communicating with the first insertion hole 62 is formed in the cylinder head 6 inward.

The first insertion shaft 106 of the connecting block 100 is inserted into the first insertion hole 62 of the cylinder head 6 and the entrance of the first insertion hole 62 is blocked by the sealing plug 120. [ The sealing plug 120 may be secured by bolts 122 as shown in Fig.

The second insertion axis 200 is inserted into the second insertion hole 62a in a direction crossing the first insertion axis 106 and connected to the side of the first insertion axis 106. [

A second supply passage 202 connected to the first supply passage 110 of the connection block 100 to feed the fuel oil to the fuel injection valve is formed in the second insertion shaft 200.

A spherical connection groove 114 is formed around the head portion 106a of the first insertion shaft 106 for connection between the first insertion shaft 106 and the second insertion shaft 200, A spherical connection protrusion 204 is formed at the distal end of the second insertion shaft 200. Therefore, the connection protrusion 204 of the second insertion shaft 200 is inserted into the connection groove 114 of the spherical surface of the first insertion shaft 106 and is closely contacted.

The pressing screw 160 is fastened from the outside to the inside of the cylinder head 6 and the front end of the pressing screw 160 presses the first insertion shaft 106 to connect the spherical surface connecting groove 114 to the spherical surface And the projection 204 is brought into close contact with a pressure.

A through hole 66 penetrating through the first insertion hole 62 is formed in the cylinder head 6 from the outside in the tightening of the pressure screw 160. In a portion where the through hole 66 is formed, And a fastening block 140 in which the fastening block 146 is formed. The pressure screw 160 is fastened to the female screw portion 164 of the fastening block 140 by its male screw portion 64. [

The drill for drilling the second insertion hole 62a enters through the through hole 66 described above. The second insertion axis 200 is inserted into the second insertion hole 62a through the through hole 66 and inserted into the second insertion hole 62a until the connection projection 204 of the front end portion is inserted into the second insertion hole 62a. The first insertion shaft 106 is inserted into the first insertion hole 62 and then the tool and the hand are inserted into the hole for mounting the fuel injection valve of the cylinder head 6, 200 is turned toward the first insertion axis 106 by turning the rear end portion in the opposite direction so that its connection protrusion 204 is brought into close contact with the connection groove 114.

Then, the fastening block 140 is fixed to the cylinder head 6. [ The fastening block 140 is fixed to the projection 60 by the stud 142 and the nut 144 described with reference to FIG. In FIG. 5, '64' is a 'tap hole' for inserting the stud 142.

The male screw portion 164 of the pressing screw 160 is fastened to the female screw portion 146 of the fastening block 140 so that the head portion 106a of the first insertion shaft 106 is pushed, Tight contact is applied to the connection groove 114 to maintain a tight connection state.

As described above, according to the present invention, only two contact-type connecting portions exist between the fuel injection pump 10 and the second insertion shaft 200, and two members (e.g., fuel oil pressure feeding pipes) There is no connection part.

This is possible because the first insertion shaft 106 extending from the connection block 100 is inserted into the cylinder head 6 and the second insertion shaft 200 is connected to the second insertion shaft 200 by a spherical surface.

Therefore, the cumulative tolerance in the manufacturing process is small, the deviation in the assembling process can be reduced, and the correction of the assembling error for preventing fuel leakage is easy and the assembling time is shortened.

Since the first insertion shaft 106 and the second insertion shaft 200 constituting the high-pressure fuel line have a structure in which they are embedded (or embedded) in the cylinder head 6, the pipes do not need to be arranged outside the engine The external structure of the engine becomes simple.

The foregoing is a description of certain preferred embodiments of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, .

6: Cylinder head
6a:
10: Fuel injection pump (10)
60: protrusion
62: first insertion hole
62a: second insertion hole
66: Through hole
100: connection block
102: Body
104:
106: first insertion axis
110: first supply passage
110a: plug
114: spherical connection groove
120: Sealing plug
140: fastening block
142: Stud
144: Nut
146: female thread
160: Pressure screw
164:
200: 2nd insert axis
202: second supply passage
204: connecting projection of spherical surface

Claims (5)

A clean engine in which a high-pressure fuel oil supply line for supplying fuel oil from a fuel injection pump (10) to a fuel injection valve of a cylinder head (6) is formed,
A first insertion hole (62) formed adjacent to the fuel injection pump (10) from the outside to the inside of the cylinder head (6);
A second insertion hole (62a) communicated at one end with the first insertion hole (62) and pierced toward the fuel injection valve (62a);
A body 102 fixed to an upper end of the fuel injection pump 10 and connected to a discharge port of the fuel injection pump 10 and a cylinder head 6 extending from the head 104 of the body 102, And a first insertion shaft 106 in which a first supply passage 110 is formed as a fuel oil passage communicating with a delivery port of the fuel injection pump 10, Block 100; And
Is inserted into the second insertion hole 62a while the end portion of the connection block 100 is connected to the first insertion axis 106 of the connection block 100 and the first supply passage 110 And a second supply passage (202) connected to the fuel injection valve and connected to the fuel injection valve to supply fuel oil to the fuel injection valve. . The method according to claim 1,
Wherein the first insertion shaft (106) of the connection block (100) extends integrally from the head part (104) to form a single body with no connection with the head part (104) . The method according to claim 1,
A projecting portion 60 is formed on the side surface portion 6a of the cylinder head 6 so that the body portion of the side surface portion 6b is further projected outward. A first insertion hole 62 is formed in the projecting portion 60, Wherein the first insertion shaft (106) of the first high-pressure fuel oil supply line (100) is inserted. The method according to claim 1,
A spherical connection groove 114 is formed around the first insertion axis 106 of the connection block 100 and a spherical connection protrusion 204 is formed at the distal end of the second insertion axis 200, Is connected to the connection groove 114 of the spherical surface of the first insertion shaft 106 and is connected to the inside of the cylinder head 6 to fasten the pressure screw 160 from the outside to the inside thereof, Pressure fuel oil supply line is connected by applying pressure to the connection groove (114) of the spherical surface and the connection protrusion (204) of the spherical surface by pressing the first insertion shaft (106). 5. The method of claim 4,
A through hole 66 penetrating through the first insertion hole 62 is formed in the cylinder head 6 at a portion where the pressure screw 160 is fastened. And the male screw portion 64 of the pressing screw 160 is fastened to the female screw portion 164 of the fastening block 140. [ A clean engine having a connection structure of a simple high-pressure fuel oil supply line.

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