JP2005171981A - Common rail type diesel engine and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a common rail type diesel engine facilitating the removal of a cylinder head cover 2 and a manufacturing method therefor. <P>SOLUTION: In this common rail type diesel engine, it is made possible to remove the cylinder head cover 2 from a cylinder head 1 without removing a fuel injection nozzle 4 and a fuel return pipe 10 when removing a nozzle connecting part 9a of a fuel supply pipe 9 from the fuel injection nozzle 4 and pulling the nozzle connecting part 9a out of the cylinder head cover 2 through a connecting part through-hole 11, by disposing a fuel inlet 5 and a fuel return outlet 6 of the fuel injection nozzle 4 within the cylinder head cover 2 in connecting the fuel supply pipe 9 to the fuel inlet 5 of the fuel injection nozzle 4 and the fuel return pipe 10 to the fuel return outlet 6 of the fuel injection nozzle 4. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

    The present invention relates to a common rail diesel engine and a method for manufacturing the same.

As a conventional common rail type diesel engine, there are the following as in the present invention.
That is, the head cover is detachably attached to the cylinder head, the fuel injection nozzle is attached to the nozzle mounting hole of the cylinder head located in the head cover, the fuel injection nozzle is provided with the fuel inlet and the fuel return outlet, and the fuel supply pump is supplied from the fuel tank. The fuel is supplied to the fuel inlet of the fuel injection nozzle through the common rail and the fuel supply pipe in order, and a part of the fuel supplied to the fuel injection nozzle is supplied from the fuel return outlet through the fuel return pipe to the fuel tank or the fuel supply pump A common rail diesel engine configured to return to

This prior art is different from the present invention in the following points.
That is, when connecting the fuel supply pipe to the fuel inlet of the fuel injection nozzle and connecting the fuel return pipe to the fuel return outlet of the fuel injection nozzle, the fuel inlet and fuel return outlet of the fuel injection nozzle are arranged outside the head cover, A nozzle connection is provided at the outlet of the fuel supply pipe, the nozzle connection is detachably connected to the fuel inlet of the fuel injection nozzle, the fuel return pipe is disposed outside the head cover, and the fuel return pipe is connected to the fuel return outlet of the fuel injection nozzle. Are detachably connected, the fuel supply pipe and the fuel return pipe are removed from the fuel injection nozzle, and the head cover cannot be removed from the cylinder head unless the fuel injection nozzle is removed from the cylinder head.

This prior art has the following problems.
<Problem> Removing the head cover is complicated.
Since the head cover cannot be removed from the cylinder head unless the fuel supply pipe and the fuel return pipe are removed from the fuel injection nozzle and the fuel injection nozzle is removed from the cylinder head, the removal of the head cover is complicated.

  An object of the present invention is to provide a common rail diesel engine and a method for manufacturing the common rail diesel engine that can solve the above-described problems, that is, a common rail diesel engine and a method for manufacturing the same that make it easy to remove the head cover.

(Invention according to claims 1 to 20)
The main invention specific matters of the inventions according to claims 1 to 20 are as follows.
1-3, the head cover (2) is detachably attached to the cylinder head (1), and the fuel injection nozzle is inserted into the nozzle mounting hole (3) of the cylinder head (1) located in the head cover (2). (4) is attached, the fuel injection nozzle (4) is provided with a fuel inlet (5) and a fuel return outlet (6), and from the fuel tank, a fuel supply pump (7), a common rail (8), and a fuel supply pipe (9) The fuel is supplied to the fuel inlet (5) of the fuel injection nozzle (4) in order, and a part of the fuel supplied to the fuel injection nozzle (4) is supplied from the fuel return outlet (6) to the fuel return pipe (10). In the common rail diesel engine configured to be returned to the fuel tank or the fuel supply pump (7) via
In connecting the fuel supply pipe (9) to the fuel inlet (5) of the fuel injection nozzle (4) and connecting the fuel return pipe (10) to the fuel return outlet (6) of the fuel injection nozzle (4), the fuel injection The fuel inlet (5) and the fuel return outlet (6) of the nozzle (4) are arranged in the head cover (2),
A nozzle connection portion (9a) is provided at the outlet of the fuel supply pipe (9), a connection portion through hole (11) is provided in the wall of the head cover (2), and a nozzle connection portion (through the connection portion through hole (11)) ( 9a) is detachably connected to the fuel inlet (5) of the fuel injection nozzle (4),
The fuel return pipe (10) is accommodated in the head cover (2), the in-head fuel return passage (12) is formed in the cylinder head (1), and the outlet (10a) of the fuel return pipe (10) is connected to the fuel in the head. By connecting to the entrance of the return passage (12)
The nozzle connection part (9a) of the fuel supply pipe (9) is removed from the fuel inlet (5) of the fuel injection nozzle (4), and is pulled out of the head cover (2) from the connection part through hole (11) of the head cover (2). In this case, the common rail diesel engine is characterized in that the head cover (2) can be removed from the cylinder head (1) without removing the fuel injection nozzle (4) and the fuel return pipe (10).

(Inventions according to claims 21 to 22)
Main invention specific matters of the inventions according to claims 21 to 22 are as follows.
In diverting the head cover (2) of the mechanically controlled injection type diesel engine that performs fuel injection with the fuel injection cam illustrated in FIGS. 9 to 10 to the common rail type diesel engine,
As illustrated in FIGS. 9 to 10 and FIGS. 1 to 3, the machine control injection type diesel engine and the common rail type diesel engine both have a head cover (2) removably attached to the cylinder head (1). The fuel injection nozzle (4) is attached to the nozzle mounting hole (3) of the cylinder head (1) located inside the fuel injection nozzle (4), the fuel injection nozzle (4) is provided with a fuel inlet (5) and a fuel return outlet (6), Fuel is supplied to the fuel inlet (5) of the fuel injection nozzle (4) via the fuel supply pipe (9), and a part of the fuel supplied to the fuel injection nozzle (4) is returned from the fuel return outlet (6). It is configured to return to a predetermined part through the pipe (10),
In connecting the fuel supply pipe (9) to the fuel inlet (5) of the fuel injection nozzle (4) and connecting the fuel return pipe (10) to the fuel return outlet (6) of the fuel injection nozzle (4),
A fuel inlet (5) and a fuel return outlet (6) of the fuel injection nozzle (4) are arranged in the head cover (2), and a nozzle connecting portion (9a) is provided at the outlet of the fuel supply pipe (9) to provide a head cover ( 2) A connecting part through hole (11) is provided in the wall of 2), and a nozzle connecting part (9a) penetrated through the connecting part through hole (11) is detachably connected to the fuel inlet (5) of the fuel injection nozzle (4). And
The fuel return pipe (10) is accommodated in the head cover (2), the in-head fuel return passage (12) is formed in the cylinder head (1), and the outlet (10a) of the fuel return pipe (10) is connected to the fuel in the head. By connecting to the entrance of the return passage (12)
The nozzle connection part (9a) of the fuel supply pipe (9) is removed from the fuel inlet (5) of the fuel injection nozzle (4), and is pulled out of the head cover (2) from the connection part through hole (11) of the head cover (2). In this case, the common rail diesel engine is characterized in that the head cover (2) can be removed from the cylinder head (1) without removing the fuel injection nozzle (4) and the fuel return pipe (10). Manufacturing method.

(Invention of Claim 1)
<Effect> The head cover can be easily removed.
As illustrated in FIG. 1, the nozzle connection portion (9 a) of the fuel supply pipe (9) is removed from the fuel injection nozzle (4), and the head cover (2) is removed from the connection portion through hole (11) of the head cover (2). The head cover (2) can be removed from the cylinder head (1) without removing the fuel injection nozzle (4) and the fuel return pipe (10). Become.

(Invention of Claim 2)
<Effect> Piping within the head cover of the fuel return pipe is facilitated.
As shown in FIG. 1, in order to apply to the overhead valve engine in which the valve camshaft (13) is arranged in the cylinder block (14), the fuel return is made by the amount that the valve camshaft is not arranged in the head cover (2). Piping within the head cover (2) of the pipe (10) is facilitated.

(Invention of Claim 3)
<Effect> The head cover can be easily attached and detached.
As illustrated in FIG. 2, since the head cover (2) can be attached to and detached from the cylinder head (1) without removing the glow plug (16) from the cylinder head (1), the head cover (2) can be attached and detached. It will be easy.

(Invention of Claim 4)
<Effect> The glow plug can be removed easily.
As illustrated in FIG. 2, with the head cover (2) attached to the cylinder head (1), the tool is engaged with the tool engaging portion (19) of the glow plug (16) protruding outside the head cover (2). Thus, the glow plug (16) can be removed from the cylinder head (1), and therefore the glow plug (16) can be easily removed.

(Invention of Claim 5)
<Effect> The head cover can be easily attached.
As shown in FIG. 2, after attaching a plurality of glow plugs (16) to the cylinder head (1), cover the head cover (2), and insert the glow plug (16) into each glow plug insertion hole (15). When the peripheral portion of the lower end opening of the glow plug insertion hole (15) is placed on the seal (17) and the center of the wall of the head cover (2) is struck downward with a mallet or the like, each glow plug insertion hole (15) Are simultaneously fitted to the respective annular seals (17), so that the head cover (2) can be easily attached.

(Invention of Claim 6)
<Effect> The leakage of the glow plug can be suppressed.
As illustrated in FIG. 2, there is no possibility that condensed water, oil mist, or the like in the head cover (2) adheres to the terminal (22) of the glow plug (16), thereby suppressing leakage of the glow plug (16). it can.

(Invention of Claim 7)
<Effect> The glow plug can be shortened.
As illustrated in FIG. 2, the glow plug (16) can be shortened by the amount by which the wall portion (23) of the head cover (2) is retracted.
<Effect> Glow plug terminals and the like can be protected.
As illustrated in FIG. 2, since the terminal (22) of the glow plug (16) and its connecting parts are arranged in the recessed space (24), they can be protected.

(Invention of Claim 8)
<Effect> Maintenance work efficiency can be increased.
As illustrated in FIG. 1, the common pipe (8) includes an inlet pipe (5a) having a fuel inlet (5) and an outlet pipe (6a) having a fuel return outlet (6) of the fuel injection nozzle (4). ) Is protruded toward the lateral side where the common rail (8) is disposed, so that the fuel inlet (5) and the fuel return outlet (6) of the fuel injection nozzle (4) are maintained together with the common rail (8) from the common rail (8) arrangement side. Can improve the work efficiency of maintenance.

(Invention of Claim 9)
<Effect> Maintenance work efficiency can be increased.
As illustrated in FIG. 1, since the fuel supply pump (7) for the common rail (8) is arranged on one lateral side of the engine on which the common rail (8) is arranged, the common rail (8) is arranged from the arrangement side of the common rail (8). ) And the fuel supply pump (7) can be maintained, and the maintenance work efficiency can be improved.

(Invention of Claim 10)
<Effect> Maintenance work efficiency can be increased.
As illustrated in FIG. 3, the passage outlet pipe (12a) having the passage outlet of the fuel return passage (12) in the head is arranged on one side of the engine where the common rail (8) is arranged. ) And the common rail (8) and the passage outlet pipe (12a) can be maintained from the arrangement side, and the maintenance work efficiency can be improved.

(Invention of Claim 11)
<Effect> Maintenance work efficiency can be increased.
As illustrated in FIGS. 3 and 4, since the bridge adjustment portions (33 a) and (34 a) are arranged near the lateral side of the engine on which the common rail (8) is arranged, the common rail (8) is arranged from the arrangement side of the common rail (8). The bridge adjustment sections (33a) and (34a) can be adjusted together with the maintenance of (8). Further, the adjustment operation portions (35b) and (36b) of the arm adjustment portions (35a) and (36a) arranged on the other side of the lateral side are adjusted from the adjustment operation portions (33b) and (34b) of the bridge adjustment portions (33a) and (34a). The arm adjusting portion (35a) is not obstructed by the adjusting operation portions (33b) and (34b) of the front bridge adjusting portions (33a) and (34a) from the arrangement side of the common rail (8). ) (36a) can be adjusted, and maintenance work efficiency can be improved.

(Invention of Claim 12)
<Effect> It is possible to protect the common rail and its components.
As illustrated in FIG. 1, since the passage forming means (49) is disposed above the common rail (8), even if tools or parts are dropped during maintenance of the peripheral parts of the common rail (8), these are formed as passage forming means. It is received by (49) and can only be dropped onto the common rail (8). For this reason, it is possible to protect the common rail (8) and its components (pressure sensor, etc.).

(Invention of Claim 13)
<Effect> Protection of the common rail can be strengthened.
As illustrated in FIG. 5, since the passage forming means (49) above the common rail (8) has a box-type structure without a branch pipe, there is a possibility that tools or parts may pass between the branch pipes. In comparison, the fall of the tool or the like from above the common rail (8) is more reliably received by the passage forming means (49). For this reason, protection of the common rail (8) can be strengthened.

(Invention of Claim 14)
<Effect> Overheating of the common rail can be prevented.
As illustrated in FIGS. 5 to 7, an engine cooling fan (42) is disposed in front of the common rail (8) so that the cooling air passes below the passage forming means (49) above the common rail (8). Therefore, the common rail (8) is cooled by the cooling air. For this reason, the overheating of the common rail (8) can be prevented, and the durability of the common rail (8) and its components (such as a pressure sensor) can be enhanced.

(Invention of Claim 15)
<Effect> Cooling efficiency of the common rail can be increased.
As shown in FIGS. 1, 4A, 6, and 7, the boss 30a protrudes downward from the lower wall 39a of the passage forming means 49, and the boss 30a is Since the lower wall (39a) of the passage forming means (49) is transversely traversed, the cooling air flowing along the lower wall (39a) of the passage forming means (49) is deflected downward by the boss (30a). And hit the common rail (8). For this reason, the cooling efficiency of the common rail (8) can be increased.

(Invention of Claim 16)
<Effect> Protection of the common rail can be strengthened.
As illustrated in FIG. 8, since the protruding portion (41a) of the gear train housing portion (41) is exposed from the rear to the rear end portion of the common rail (8), it approaches from the rear of the common rail (8) during maintenance. The tool and parts to be received are received by the protruding portion (41a) of the gear train housing portion (41). For this reason, protection of the common rail (8) can be strengthened.

(Invention of Claim 17)
<Effect> The width of the engine can be kept small.
As illustrated in FIG. 6, since the belt tensioner (44) is disposed in front of the fuel supply pump (7), the lateral width of the engine can be kept small compared to the case where these are arranged side by side.

(Invention of Claim 18)
<Effect> Maintenance work efficiency can be increased.
As illustrated in FIG. 6, since the generator (45) is a belt tensioner (44), the generator (45) having a high maintenance frequency and the fuel supply pump (7) of the common rail (8) are arranged on the same side. The maintenance work efficiency can be increased.

(Invention of Claim 19)
<Effect> Maintenance work efficiency can be increased.
As illustrated in FIG. 6, since the fuel supply pump (7) for the common rail (8) is arranged on the side where the common rail (8) is located, the fuel for the common rail (8) and the common rail (8), which are frequently maintained, are arranged. The supply pump (7) is arranged on the same side, and the maintenance work efficiency can be increased.

<Effect> The width of the engine can be kept small.
As illustrated in FIG. 6, the fuel supply pump (7) for the common rail (8) is disposed on one lateral side of the upper portion (14 a) of the cylinder block (14), so that it is illustrated in FIG. 5. In addition, the fuel supply pump (7) having a relatively large lateral width can be accommodated reasonably in a large accommodation space without a large projecting side portion, and the lateral width of the engine can be kept small.

(Invention of Claim 20)
<Effect> Maintenance work efficiency can be increased.
As illustrated in FIG. 6, since the oil cooler (46) and the starter motor (47) are arranged on the side where the common rail (8) is present, the common rail (8), the oil cooler (46), and the starter having a high maintenance frequency are arranged. The motor (47) is arranged on the same side, and the maintenance work efficiency can be increased.

<Effect> The width of the engine can be kept small.
As illustrated in FIG. 6, the oil cooler (46) and the starter motor (47) are arranged on the lateral side of the central part (14 b) in the vertical direction of the cylinder block (14) so as to be distributed back and forth. The oil cooler (46) and the starter motor (47) having a relatively small lateral width are reasonably arranged in the accommodation space narrowed by the lateral extension of the crankcase (50). By effective use, the accommodation space narrowed by the extension of the crankcase (50) in the lateral direction of the engine can be accommodated without waste, and the lateral width of the engine can be kept small.

(Invention of Claim 21)
<Effect> The head cover can be easily removed.
As illustrated in FIG. 1, the nozzle connection portion (9 a) of the fuel supply pipe (9) is removed from the fuel injection nozzle (4), and the head cover (2) is removed from the connection portion through hole (11) of the head cover (2). The head cover (2) can be removed from the cylinder head (1) without removing the fuel injection nozzle (4) and the fuel return pipe (10). Become.

<Effect> The manufacturing cost of the common rail diesel engine is reduced.
As illustrated in FIG. 1, since the head cover (2) of a mechanically controlled injection diesel engine that performs fuel injection with a fuel injection cam is diverted, the manufacturing cost of the common rail diesel engine is reduced.

(Invention of Claim 22)
<Effect> It becomes easy to connect the fuel injection nozzle to the connector.
As illustrated in FIG. 1, since the connector (26) of the fuel injection nozzle (4) protrudes outside the head cover (2), the connection of the fuel injection nozzle (4) to the connector (26) is facilitated.

Embodiments of the present invention will be described with reference to the drawings.
In this embodiment, a common rail diesel engine and a method for manufacturing the common rail diesel engine will be described. The common rail type diesel engine is manufactured by diverting parts of a mechanically controlled injection type diesel engine that performs fuel injection with a fuel injection cam.
FIGS. 1-8 is a figure explaining the common rail type diesel engine which concerns on embodiment of this invention, and this embodiment demonstrates using a vertical multicylinder diesel engine.

The outline of this engine is as follows.
As shown in FIG. 1, the cylinder head (1) is assembled to the upper part of the cylinder block (14), and the head cover (2) is detachably attached to the upper part of the cylinder head (1). A fuel injection nozzle (4) is attached to the nozzle mounting hole (3) of the cylinder head (1) located in the head cover (2), and a fuel inlet (5) and a fuel return outlet (6) are connected to the fuel injection nozzle (4). Is provided. Fuel is supplied from the fuel tank to the fuel inlet (5) of the fuel injection nozzle (4) through the fuel supply pump (7), the common rail (8) and the fuel supply pipe (9) in this order. A part of the fuel supplied to the fuel is returned from the fuel return outlet (6) to the fuel tank via the fuel return pipe (10). The fuel may be returned to the fuel supply pump (7).

The piping for the fuel injection nozzle (4) is as follows.
As shown in FIG. 1, the fuel supply pipe (9) is connected to the fuel inlet (5) of the fuel injection nozzle (4), and the fuel return pipe (10) is connected to the fuel return outlet (6) of the fuel injection nozzle (4). Are connected, the fuel inlet (5) and the fuel return outlet (6) of the fuel injection nozzle (4) are arranged in the head cover (2). A nozzle connection portion (9a) is provided at the outlet of the fuel supply pipe (9), a connection portion through hole (11) is provided in the wall of the head cover (2), and a nozzle connection portion (through the connection portion through hole (11)) ( 9a) is detachably connected to the fuel inlet (5) of the fuel injection nozzle (4). The connecting portion through hole (11) is formed in the peripheral wall of the head cover (2). The fuel inlet (5) and the fuel return outlet (6) of the fuel injection nozzle (4) are projected in the same direction from the peripheral side of the fuel injection nozzle (4). This fuel injection nozzle (4) is also called an injector.

  As shown in FIGS. 2 to 3, the fuel return pipe (10) is accommodated in the head cover (2), the in-head fuel return passage (12) is formed in the cylinder head (1), and the fuel return pipe (10). The outlet (10a) is connected to the inlet of the in-head fuel return passage (12). Thereby, as shown in FIG. 1, the nozzle connection part (9a) of the fuel supply pipe (9) is removed from the fuel inlet (5) of the fuel injection nozzle (4), and the connection part through hole ( 11) When the head cover (2) is removed from the head cover (2), the head cover (2) can be removed from the cylinder head (1) without removing the fuel injection nozzle (4) and the fuel return pipe (10). Yes. This engine is an overhead valve engine in which a valve camshaft (13) is arranged in a cylinder block (14). The outlet of the in-head fuel return passage (12) communicates with the fuel tank.

The attachment structure of the glow plug (16) is as follows.
As shown in FIG. 2, a glow plug insertion hole (15) is formed in the wall of the head cover (2), a glow plug (16) is inserted into the glow plug insertion hole (15), and a glow plug insertion hole (15) is formed. In sealing the gap between the glow plug (16) with the annular seal (17), the annular seal (17) is fitted and fixed to the glow plug (16), and the head cover (2) of the glow plug (16) is fixed. The outer diameter of the protruding portion (18) is made smaller than the inner diameter of the glow plug insertion hole (15). Thus, the head cover (2) can be attached to and detached from the cylinder head (1) without removing the glow plug (16) from the cylinder head (1). The glow plug insertion hole (15) is formed in the ceiling wall of the head cover (2).

The structure related to the glow plug 16 is as follows.
As shown in FIG. 2, a tool engaging portion (19) is provided on a portion (18) of the glow plug (16) that protrudes outside the head cover (2). When attaching a plurality of glow plugs (16) to the cylinder head (1), each glow plug (16) is inclined in the same direction by a predetermined angle (21) with respect to the cylinder center axis (20), and the wall of the head cover (2) A glow plug insertion hole (15) is formed in a direction parallel to the glow plug (16). A terminal (22) is provided on a portion (18) of the glow plug (16) protruding outside the head cover (2). Of the wall of the head cover (2), the portion (23) through which the glow plug (16) has passed is retracted toward the cylinder head (1), and as the wall portion (23) is retracted, the head cover (2) A terminal (22) of the glow plug (16) is disposed in a recessed space (24) formed outside.

The component arrangement is as follows.
As shown in FIG. 1, when a common rail (8) is arranged on one side of the engine with the width direction of the engine as a lateral direction, an inlet pipe (5a) having a fuel inlet (5) of a fuel injection nozzle (4) is provided. ) And an outlet pipe (6a) having a fuel return outlet (6), both project toward the lateral side of the engine on which the common rail (8) is disposed. An annular joint of the fuel return pipe (10) is attached to the outlet pipe (6a). Further, a fuel supply pump (7) for the common rail (8) is arranged on one lateral side of the engine on which the common rail (8) is arranged. The common rail (8) is erected in the front-rear direction, a pressure sensor is disposed at the front end thereof, and a relief valve is disposed at the rear end thereof.

  As shown in FIG. 3, a passage outlet pipe (12a) having a passage outlet of the in-head fuel return passage (12) is arranged on one lateral side of the engine on which the common rail (8) is arranged. As shown in FIGS. 3 and 4, each valve (31) (31) (32) is connected to a valve bridge (33) (34) that opens and closes a plurality of valves (31) (31) (32) (32) in synchronization. ) (32) is provided with a bridge adjusting portion (33a) (34a) for adjusting the height of the contact surface, and the rocker arms (35) (36) are provided with the rocker arms (35) (36) and bush rods (37) (38). Arm adjustment part (35a) (36a) that adjusts the clearance of the rail is provided, and the bridge adjustment part (33a) (34a) is arranged near the lateral side of the engine on which the common rail (8) is arranged, and the lateral side of the engine The arm adjusting portions (35a) and (36a) are arranged in the arm adjusting portions (35a) and (36a), and the adjusting operation portions (35b) and (36b) of the arm adjusting portions (35a) and (36a) are adjusted. It is arranged at a position higher than (34b). In the figure, reference numeral (31) is an intake valve, (32) is an exhaust valve, (33) is an intake valve bridge, (35) is an intake rocker arm, (36) is an exhaust rocker arm, and (37) is an intake push rod. , (38) are exhaust push rods. Two intake valves (31) and two exhaust valves (32) are arranged for each cylinder. Each of the bridge adjusting portions (33a) (34a) and the arm adjusting portions (35a) (36a) is composed of a male screw rod and a lock nut, and each of these adjusting operation portions is divided and locked at the upper end of the male screw rod. A nut.

  As shown in FIG. 1, the intake air distribution means (39) is disposed above the common rail (8). Instead of the intake air distribution means (39), the exhaust gas merging means (48) may be arranged above the common rail (8). That is, the passage forming means (49) selected from either the intake distribution means (39) or the exhaust merging means (48) may be disposed above the common rail (8). The passage forming means (49) above the common rail (8) has a box structure without a branch pipe. As shown in FIGS. 5 to 7, the installation direction of the crankshaft (28) is the front-rear direction, one of which is the front and the other is the rear, and the engine cooling fan (42) is disposed in front of the common rail (8), The wind passes below the passage forming means (49) above the common rail (8).

  The intake air distribution means (39) corresponds to an intake manifold, but since there is no branch pipe, it is given such a part name. The exhaust merging means (48) is equivalent to an exhaust manifold, but in order to match the part name of the intake air distributing means, such a part name is used. As shown in FIG. 7, a generator (45) serving as a belt tensioner (44) and its stay (44a) are arranged in front of the common rail (8), and the engine cooling fan (42) faces backward. The wind to be sent passes through the gap between the generator (45) and the cylinder block (14) and the upper part of the stay (44a) and is supplied below the passage forming means (49). The engine cooling fan (42) is a radiator fan.

  As shown in FIG. 1, FIG. 4 (A), FIG. 6, and FIG. 7, the passage forming means (49) above the common rail (8) has a box structure without a branch pipe and is attached to the lower wall (39a). A boss (30a) of the bolt (30) is provided, and this boss (30a) protrudes downward from the lower wall (39a) of the passage forming means (49), and this boss (30a) serves as the passage forming means (49). The lower wall (39a) is traversed sideways.

  As shown in FIG. 5, a gear train (40) interlocking with a fuel supply pump (7) for the common rail (8) is disposed at the rear of the engine, and the gear train (40) is accommodated in the gear train accommodating portion (41). Then, a part of the gear train housing part (41) is projected sideways, and a fuel supply pump (7) for the common rail (8) is attached to the front surface of the projecting part (41a), and as shown in FIG. (8) The protrusion part (41a) of the gear train accommodating part (41) is made to face from the rear to the rear end part.

  As shown in FIG. 6, a belt transmission (43) is arranged at the front part of the engine, and a gear train (40) interlocking with the fuel supply pump (7) for the common rail (8) is arranged at the rear part of the engine. The gear train (40) is accommodated in the gear train accommodating part (41), a part of the gear train accommodating part (41) is projected sideways, and fuel for the common rail (8) is supplied to the front surface of the projecting part (41a). A pump (7) is attached, and a belt tensioner (44) of the belt transmission (43) is disposed in front of the fuel supply pump (7). In this embodiment, the generator (45) is a belt tensioner (44).

  As shown in FIG. 6, the fuel supply pump (7) for the common rail (8) is arranged on one side of the upper portion (14a) of the cylinder block (14) on the side with the common rail (8). ing. Also, on the side where the common rail (8) is located, the oil cooler (46) and the starter motor (47) are arranged in the front-rear direction on one side of the vertical center (14b) of the cylinder block (14). Yes. Further, on the side where the common rail (8) is located, an oil filter (51) attached to the rear part of the oil cooler (46), an oil level gauge (between the starter motor (47) and the oil filter (51)) ( 52) and a fuel filter (53).

The method for manufacturing the engine is as follows.
A head cover (2), a cylinder head (1), and a cylinder block (14) of a mechanically controlled injection type diesel engine that performs fuel injection with the fuel injection cam shown in FIGS. 9 to 10 are shown in FIGS. Manufactures common rail diesel engines.
Both the machine-controlled injection diesel engine and the common rail diesel engine have the following structure.
The head cover (2) is detachably attached to the cylinder head (1), the fuel injection nozzle (4) is attached to the nozzle mounting hole (3) of the cylinder head (1) located in the head cover (2), and the fuel injection nozzle ( 4) is provided with a fuel inlet (5) and a fuel return outlet (6). Fuel is supplied to the fuel inlet (5) of the fuel injection nozzle (4) via the fuel supply pipe (9), and the fuel injection nozzle ( Part of the fuel supplied to 4) is returned from the fuel return outlet (6) to the fuel tank via the fuel return pipe (10). The fuel may be returned to the fuel supply pump (7) or the fuel injection pump (54).

  In connecting the fuel supply pipe (9) to the fuel inlet (5) of the fuel injection nozzle (4) and connecting the fuel return pipe (10) to the fuel return outlet (6) of the fuel injection nozzle (4), the fuel injection A fuel inlet (5) and a fuel return outlet (6) of the nozzle (4) are arranged in the head cover (2), and a nozzle connecting portion (9a) is provided at the outlet of the fuel supply pipe (9), so that the head cover (2) A connecting part through hole (11) is provided in the wall of the nozzle, and a nozzle connecting part (9a) penetrating the connecting part through hole (11) is detachably connected to the fuel inlet (5) of the fuel injection nozzle (4). Yes.

  The fuel return pipe (10) is accommodated in the head cover (2), the in-head fuel return passage (12) is formed in the cylinder head (1), and the outlet (10a) of the fuel return pipe (10) is connected to the fuel in the head. By connecting to the inlet of the return passage (12), the nozzle connecting part (9a) of the fuel supply pipe (9) is removed from the fuel inlet (5) of the fuel injection nozzle (4), and the connecting part of the head cover (2) When the head cover (2) is extracted from the through hole (11), the head cover (2) can be removed from the cylinder head (1) without removing the fuel injection nozzle (4) and the fuel return pipe (10). I am doing so. In FIG. 9 and FIG. 10, the same reference numerals are given to the same elements as those of the common rail type diesel engine.

  In this manufacturing method, as shown in FIG. 1, a connector insertion hole (25) is formed in the wall of the head cover (2), and the connector (26) of the fuel injection nozzle (4) is connected to the head cover through the connector insertion hole (25). (2) Project outside and cover this connector (26) with a connector cover (27) attached to the wall of the head cover (2). The connector (26) is for connecting an electric circuit for energization and control to the solenoid valve of the fuel injection nozzle (4).

It is a vertical front view of the upper half part of the common rail type diesel engine which concerns on embodiment of this invention. It is a vertical side view of the front upper half part of the engine of FIG. It is a top view of the cylinder head of the engine of FIG. 4A is a longitudinal front view of the upper part of the engine of FIG. 1, and FIG. 4B is a cross-sectional view taken along line BB of FIG. 4A. It is a top view of the engine of FIG. It is a left view of the engine of FIG. It is a front view of the engine of FIG. It is a rear view of the engine of FIG. It is a longitudinal front view of the upper half part of the mechanical control injection type diesel engine which diverts components for manufacture of the engine of FIG. It is a top view of the cylinder head of the engine of FIG.

Explanation of symbols

(1) ... Cylinder head, (2) ... Head cover, (3) ... Nozzle mounting hole, (4) ... Fuel injection nozzle, (5) ... Fuel inlet, (5a) ... Inlet pipe, (6) ... Fuel return outlet (6a) ... exit pipe, (7) ... fuel supply pump, (8) ... common rail, (9) ... fuel supply pipe, (9a) ... nozzle connection, (10) ... fuel return pipe, (10a) ... Outlet, (11) ... Connector through hole, (12) ... In-head fuel return passage, (12a) ... Passage outlet pipe, (13) ... Valve camshaft, (14) ... Cylinder block, (14a) ... Up (14b) ... Center part in the vertical direction, (15) ... Glow plug insertion hole, (16) ... Glow plug, (17) ... Ring seal, (18) ... Part protruding outward, (19) ... Tool (20) ... Cylinder center axis, (21) ... Predetermined angle, (22) ... Terminal, (23) ... Wall portion, (24) ... Recessed space, (25) ... Connector insertion hole, (26 ) ... (27) ... connector cover, (28) ... crankshaft, (30) ... mounting bolt, (30a) ... boss, (31) intake valve, (32) exhaust valve, (33) intake valve bridge, (33a ) ... Bridge adjustment part, (33b) ... Adjustment operation part, (34) Exhaust valve bridge, (34a) ... Bridge adjustment part, (34b) ... Adjustment operation part, (35) Intake rocker arm, (35a) ... Arm adjustment (35b) ... adjustment operation part, (36) exhaust rocker arm, (36a) ... arm adjustment part, (36b) ... adjustment operation part, (37) intake push rod, (38) exhaust push rod, 39) Intake distribution means, (39a) ... lower wall, (40) gear train, (41) gear train housing, (41a) ... projecting part, (42) ... engine cooling fan, (43) ... belt transmission, (44) ... Belt tensioner, (45) ... Generator, (46) ... Oil cooler , (47) ... starter motor, (49) ... passage forming means.

Claims (22)

The head cover (2) is detachably attached to the cylinder head (1), the fuel injection nozzle (4) is attached to the nozzle mounting hole (3) of the cylinder head (1) located in the head cover (2), and the fuel injection nozzle ( 4) is provided with a fuel inlet (5) and a fuel return outlet (6), and a fuel injection nozzle (4) from the fuel tank through a fuel supply pump (7), a common rail (8) and a fuel supply pipe (9) in this order. ) Is supplied to the fuel inlet (5), and a part of the fuel supplied to the fuel injection nozzle (4) is supplied from the fuel return outlet (6) to the fuel tank or the fuel supply pump (10) via the fuel return pipe (10). In the common rail diesel engine configured to return to 7),
In connecting the fuel supply pipe (9) to the fuel inlet (5) of the fuel injection nozzle (4) and connecting the fuel return pipe (10) to the fuel return outlet (6) of the fuel injection nozzle (4), the fuel injection The fuel inlet (5) and the fuel return outlet (6) of the nozzle (4) are arranged in the head cover (2),
A nozzle connection portion (9a) is provided at the outlet of the fuel supply pipe (9), a connection portion through hole (11) is provided in the wall of the head cover (2), and a nozzle connection portion (through the connection portion through hole (11)) ( 9a) is detachably connected to the fuel inlet (5) of the fuel injection nozzle (4),
The fuel return pipe (10) is accommodated in the head cover (2), the in-head fuel return passage (12) is formed in the cylinder head (1), and the outlet (10a) of the fuel return pipe (10) is connected to the fuel in the head. By connecting to the entrance of the return passage (12)
The nozzle connection part (9a) of the fuel supply pipe (9) is removed from the fuel inlet (5) of the fuel injection nozzle (4), and is pulled out of the head cover (2) from the connection part through hole (11) of the head cover (2). In this case, the common rail diesel engine is characterized in that the head cover (2) can be removed from the cylinder head (1) without removing the fuel injection nozzle (4) and the fuel return pipe (10). In the common rail type diesel engine according to claim 1,
A common rail diesel engine characterized by being applied to an overhead valve engine in which a valve camshaft (13) is arranged in a cylinder block (14). In the common rail type diesel engine according to claim 1 or 2,
A glow plug insertion hole (15) is formed in the wall of the head cover (2), the glow plug (16) is inserted into the glow plug insertion hole (15), and the glow plug insertion hole (15) and the glow plug (16) are connected to each other. When sealing the space with the annular seal (17),
The annular seal (17) is fitted and fixed to the glow plug (16), and the outer diameter of the portion (18) protruding out of the head cover (2) of the glow plug (16) is set in the glow plug insertion hole (15). The common rail diesel, characterized in that the head cover (2) can be attached to and detached from the cylinder head (1) without removing the glow plug (16) from the cylinder head (1) by making it smaller than the inner diameter. engine. In the common rail type diesel engine according to claim 3,
A common rail type diesel engine characterized in that a tool engaging portion (19) is provided on a portion (18) of the glow plug (16) protruding outside the head cover (2). In the common rail type diesel engine according to claim 3 or 4,
In attaching a plurality of glow plugs (16) to the cylinder head (1),
Each glow plug (16) is inclined in the same direction by a predetermined angle (21) with respect to the cylinder center axis (20), and a glow plug insertion hole (15) parallel to the glow plug (16) is formed in the wall of the head cover (2). ), A common rail diesel engine characterized by that. In the common rail type diesel engine according to any one of claims 3 to 6,
A common rail type diesel engine characterized in that a terminal (22) is provided on a portion (18) of the glow plug (16) protruding outside the head cover (2). In the common rail type diesel engine according to claim 6,
Of the wall of the head cover (2), the portion (23) through which the glow plug (16) has passed is retracted toward the cylinder head (1), and as the wall portion (23) is retracted, the head cover (2) A common rail diesel engine characterized in that a terminal (22) of a glow plug (16) is disposed in a recessed space (24) formed outside. In the common rail type diesel engine according to any one of claims 1 to 7,
With the width direction of the engine as the horizontal direction,
When placing the common rail (8) on one side of the engine,
The inlet pipe (5a) having the fuel inlet (5) of the fuel injection nozzle (4) and the outlet pipe (6a) having the fuel return outlet (6) are all arranged side by side in the engine in which the common rail (8) is arranged. A common rail type diesel engine that protrudes to the side. In the common rail type diesel engine according to claim 8,
A common rail type diesel engine, characterized in that a fuel supply pump (7) for the common rail (8) is arranged on one lateral side of the engine on which the common rail (8) is arranged. In the common rail type diesel engine according to any one of claims 1 to 9,
With the width direction of the engine as the horizontal direction,
When placing the common rail (8) on one side of the engine,
A common rail type diesel engine, characterized in that a passage outlet pipe (12a) having a passage outlet of a fuel return passage (12) in the head is arranged on one side of the engine on which the common rail (8) is arranged. In the common rail type diesel engine according to any one of claims 1 to 10,
With the width direction of the engine as the horizontal direction,
When placing the common rail (8) on one side of the engine,
The height of the contact surface of each valve (31) (31) (32) (32) to the valve bridge (33) (34) that opens and closes the plurality of valves (31) (31) (32) (32) in synchronization. Bridge adjusting portions (33a) and (34a) for adjusting the arm and adjusting the clearance between the rocker arms (35) and (36) and the bush rods (37) and (38) in the rocker arms (35 and 36). ) (36a), a bridge adjustment part (33a) (34a) is arranged near one side of the engine where the common rail (8) is arranged, and an arm adjustment part (35a) (36a) is arranged near the other side. The adjustment operation portions (35b) and (36b) of the arm adjustment portions (35a) and (36a) are arranged at positions higher than the adjustment operation portions (33b) and (34b) of the bridge adjustment portions (33a) and (34a). This is a common rail diesel engine. In the common rail type diesel engine according to any one of claims 1 to 11,
With the width direction of the engine as the horizontal direction,
When placing the common rail (8) on the side of the engine,
A common rail type diesel engine, characterized in that a passage forming means (49) selected from either an intake air distributing means (39) or an exhaust merging means (48) is disposed above the common rail (8). In the common rail type diesel engine according to claim 12,
A common rail diesel engine characterized in that the passage forming means (49) above the common rail (8) has a box-type structure without a branch pipe. In the common rail type diesel engine according to claim 12 or 13,
The installation direction of the crankshaft (28) is the front-rear direction, one of which is the front, the other is the rear,
An engine cooling fan (42) is arranged in front of the common rail (8), and the cooling air passes below the passage forming means (49) above the common rail (8). . In the common rail type diesel engine according to claim 14,
The passage forming means (49) above the common rail (8) has a box structure without a branch pipe, and a boss (30a) of a mounting bolt (30) is provided on the lower wall (39a), and this boss (30a) is connected to the passage. The boss (30a) protrudes downward from the lower wall (39a) of the forming means (49) and crosses the lower wall (39a) of the passage forming means (49) laterally. Common rail diesel engine. In the common rail type diesel engine according to any one of claims 1 to 15,
With the width direction of the engine as the horizontal direction,
When placing the common rail (8) on one side of the engine,
The installation direction of the crankshaft (28) is the front-rear direction, one of which is the front, the other is the rear,
A gear train (40) interlocking with the fuel supply pump (7) for the common rail (8) is disposed at the rear of the engine, the gear train (40) is accommodated in the gear train accommodating portion (41), and the gear train accommodating portion ( 41) is protruded sideways, a fuel supply pump (7) for the common rail (8) is attached to the front surface of the protruding portion (41a), and a gear train is accommodated at the rear end of the common rail (8) from behind. A common rail type diesel engine having a protruding portion (41a) facing the portion (41). In the common rail type diesel engine according to any one of claims 1 to 16,
With the width direction of the engine as the horizontal direction,
When placing the common rail (8) on one side of the engine,
The installation direction of the crankshaft (28) is the front-rear direction, one of which is the front, the other is the rear,
A belt transmission device (43) is arranged at the front of the engine, a gear train (40) interlocking with the fuel supply pump (7) for the common rail (8) is arranged at the rear of the engine, and the gear train (40) is geared. It is accommodated in the train accommodating part (41), a part of the gear train accommodating part (41) is projected sideways, and a fuel supply pump (7) for the common rail (8) is attached to the front surface of the projecting part (41a), A common rail type diesel engine having a belt tensioner (44) of a belt transmission (43) disposed in front of the fuel supply pump (7). In the common rail type diesel engine according to claim 17,
A common rail diesel engine characterized in that the generator (45) is a belt tensioner (44). In the common rail type diesel engine according to claim 17 or 18,
A common rail characterized in that a fuel supply pump (7) for the common rail (8) is arranged on one side of the upper portion (14a) of the cylinder block (14) on the side where the common rail (8) is located. Diesel engine. In the common rail type diesel engine according to claim 19,
The oil cooler (46) and the starter motor (47) are arranged on the side with the common rail (8) on the lateral side of the vertical center (14b) of the cylinder block (14). A common rail type diesel engine that is characterized. When diverting the head cover (2) of a mechanically controlled diesel engine that injects fuel with a fuel injection cam to a common rail diesel engine,
In both the machine-controlled injection diesel engine and the common rail diesel engine, the head cover (2) is detachably attached to the cylinder head (1), and the nozzle mounting holes (in the cylinder head (1) located in the head cover (2)) ( The fuel injection nozzle (4) is attached to 3), the fuel injection nozzle (4) is provided with a fuel inlet (5) and a fuel return outlet (6), and the fuel injection nozzle (4) is connected via a fuel supply pipe (9). The fuel is supplied to the fuel inlet (5), and a part of the fuel supplied to the fuel injection nozzle (4) is returned from the fuel return outlet (6) to the predetermined part via the fuel return pipe (10). ,
In connecting the fuel supply pipe (9) to the fuel inlet (5) of the fuel injection nozzle (4) and connecting the fuel return pipe (10) to the fuel return outlet (6) of the fuel injection nozzle (4),
A fuel inlet (5) and a fuel return outlet (6) of the fuel injection nozzle (4) are arranged in the head cover (2), and a nozzle connecting portion (9a) is provided at the outlet of the fuel supply pipe (9) to provide a head cover ( 2) A connecting part through hole (11) is provided in the wall of 2), and a nozzle connecting part (9a) penetrated through the connecting part through hole (11) is detachably connected to the fuel inlet (5) of the fuel injection nozzle (4). And
The fuel return pipe (10) is accommodated in the head cover (2), the in-head fuel return passage (12) is formed in the cylinder head (1), and the outlet (10a) of the fuel return pipe (10) is connected to the fuel in the head. By connecting to the entrance of the return passage (12)
The nozzle connection part (9a) of the fuel supply pipe (9) is removed from the fuel inlet (5) of the fuel injection nozzle (4), and is pulled out of the head cover (2) from the connection part through hole (11) of the head cover (2). In this case, the common rail diesel engine is characterized in that the head cover (2) can be removed from the cylinder head (1) without removing the fuel injection nozzle (4) and the fuel return pipe (10). Manufacturing method. In the manufacturing method of the common rail type diesel engine according to claim 21,
A connector insertion hole (25) is formed in the wall of the head cover (2), and the connector (26) of the fuel injection nozzle (4) is projected out of the head cover (2) from the connector insertion hole (25). Is covered with a connector cover (27) attached to the wall of the head cover (2).

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