JP2001248522A - Engine provided with fuel injection nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the damage to an annular elastic seal 21 since a tool is received by a tool receiving flange 20b without abutting on the annular elastic seal 21 even if the tool is slid on a surface of a tool engaging part 20a in the case where the tool such as a spanner is engaged with a tool engaging part 20a of a connecting pipe 20 and the connecting pipe 20 is screwed around a fuel inlet pipe 14. SOLUTION: In an engine formed in such a constitution that the connecting pipe 20 of a fuel supplying pipe 12 is penetrated in a connecting pipe inserting hole 19 of a head cover 5, a tool engaging part 20a is disposed on an outside part of a head cover of the connecting pipe 20, a part in the head cover of the connecting pipe 20 is fitted to the fuel inlet pipe 14 of a fuel injection nozzle 13, and is screwed around the fuel inlet pipe 14, and the annular elastic seal 21 is fitted into the connecting pipe inserting hole 19; the tool receiving flange 20b having a diameter larger than that of the tool engaging part 20a is disposed on a position of the annular elastic seal 21 side from the tool engaging part 20a, and on an outside part of the head cover of the connecting pipe 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine having a fuel injection nozzle.

[0002]

2. Description of the Related Art FIG. 6 shows an engine having a fuel injection nozzle. This is because the fuel injection nozzle (113) is housed in the head cover (105), the connecting pipe insertion hole (119) is provided in the peripheral side wall (105a) of the head cover (105), and the fuel injection nozzle (113) is inserted from the peripheral side surface. Insert the projecting fuel inlet pipe (114) into the connecting pipe insertion hole (1).
19), a connecting pipe (120) provided at the outlet end of the fuel supply pipe (112) is passed through the connecting pipe insertion hole (119), and a tool engaging portion is formed on the outer part of the head cover of the connecting pipe (120).
(120a) is provided, the inner portion of the head cover of the connection pipe (120) is fitted and screwed into the fuel inlet pipe (114), and the annular elastic seal (121) is fitted in the connection pipe insertion hole (119). It is composed. In this prior art, only the tool engaging portion (120a) is provided on the outer portion of the head cover of the connecting pipe (120).

[0003]

The above prior art has the following problems. << 1 >> The annular elastic seal (121) is easily damaged. Connection pipe
When a tool such as a wrench is engaged with the tool engaging portion (120a) of (120) and the connection pipe (120) is screwed to the fuel inlet pipe (114), the tool is placed on the surface of the tool engaging portion (120a). Slip on,
It hits the annular elastic seal (121) and is easily damaged. If the annular elastic seal (121) is damaged,
(119) cannot be properly sealed.

<2> Cleaning water or the like easily enters the head cover (105) through the connection pipe insertion hole (119). When cleaning the engine, the cleaning water passing around the tool engaging portion (120a) directly hits the elastic annular seal (121), pushes it open, and opens the head cover (105) through the connecting pipe insertion hole (119).
Easy to get inside. When the engine is mounted on a machine used in a wetland such as a rice planting machine, for the same reason, muddy water coming in from the connecting pipe insertion hole (119) is inserted into the head cover (10).
5) It is easy to invade inside. The invasion of these foreign substances into the head cover (105) contaminates the lubricating oil and shortens its useful life.

An object of the present invention is to provide an engine having a fuel injection nozzle, which can solve the above-mentioned problems.

[0006]

Means for Solving the Problems (Invention of Claim 1) The configuration of the invention of Claim 1 is as follows. As shown in FIG. 2, a fuel injection nozzle (13) is accommodated in a head cover (5), and a connection pipe insertion hole is formed in a peripheral side wall (5a) of the head cover (5).
(19), a connecting pipe provided at the outlet end of the fuel supply pipe (12) with the fuel inlet pipe (14) projecting from the peripheral side surface of the fuel injection nozzle (13) facing the connecting pipe insertion hole (19). (20) is passed through the connection pipe insertion hole (19), and a tool engaging portion (20a) is provided on the outer part of the head cover of the connection pipe (20).
The inner portion of the head cover of (0) is fitted and screwed into the fuel inlet pipe (14), and the annular elastic seal (2) is inserted into the connecting pipe insertion hole (19).
In an engine having a fuel injection nozzle in which 1) is fitted, an annular elastic seal is provided rather than the tool engagement portion (20a).
(21) A fuel injection nozzle, characterized in that a tool receiving flange (20b) having a diameter larger than that of the tool engaging portion (20a) is provided at a position closer to the head cover outside portion of the connecting pipe (20). With an engine.

(Invention of claim 2) The configuration of the invention of claim 2 is as follows. 2. An engine provided with a fuel injection nozzle according to claim 1, wherein an O-ring (22) is provided between fitting surfaces of the connection pipe (20) and the fuel inlet pipe (14), as shown in FIG. An engine provided with a fuel injection nozzle.

(Invention of claim 3) The configuration of the invention of claim 3 is as follows. An engine provided with the fuel nozzle according to claim 1 or 2, wherein an inner end (21a) of the annular seal (21) is connected to a protruding end of the fuel inlet pipe (14) as shown in FIG. Fuel inlet pipe than (14a)
(14) An engine provided with a fuel injection nozzle, which is retracted in the projecting direction.

(Invention of claim 4) The configuration of the invention of claim 4 is as follows. An engine provided with the fuel injection nozzle according to any one of claims 1 to 3,
As shown in FIG. 1, a nozzle holding member (48) having a lever (46) and a holding bolt (47) is provided.
By pressing the point of force (53) of the lever (46) with the pressing part (54) of (47), the fuel injection nozzle (13) is moved to the cylinder head (3) at the point of action (52) of the lever (46). Nozzle insertion hole
(33), and the fuel injection nozzle (13) is fixed to the cylinder head (3) by the pushing force (46a).
(C) An engine provided with a fuel injection nozzle, wherein the lever (46) is received by a stopper (49).

(Invention of claim 5) The configuration of the invention of claim 5 is as follows. In the engine provided with the fuel injection nozzle according to claim 4, as shown in FIG.
At the point of action (52) of the lever (46), the fuel injection nozzle (1)
An engine provided with a fuel injection nozzle, wherein the fuel injection nozzle is prevented from rotating around 3).

[0011]

Operation and Effect of the Invention (Invention of claim 1) The invention of claim 1 has the following operation and effects. << 1 >> The annular elastic seal (21) is hardly damaged. As is apparent from FIG. 2, a tool such as a wrench is engaged with the tool engaging portion (20a) of the connection pipe (20), and the connection pipe (20) is connected to the fuel inlet pipe.
When the screw is screwed to (14), even if the tool slides on the surface of the tool engaging portion (20a), the tool is received by the tool receiving flange (20b) and does not hit the annular elastic seal (21).
Therefore, the annular elastic seal (21) is hardly damaged, and the connection pipe insertion hole (19) can be properly sealed.

<2> It is difficult for washing water or the like to enter the head cover (5) from the connection pipe insertion hole (19). As is clear from FIG. 2, when cleaning the engine, the tool engaging portion (20a)
Of the washing water passing around the tool receiving flange (20b)
And it is difficult to directly hit the elastic annular seal (21), so that the washing water flows from the connection pipe insertion hole (19) to the head cover.
(5) It is hard to invade inside. When the engine is mounted on a machine used in a wetland such as a rice transplanter, muddy water coming in from the connecting pipe insertion hole (19) for the same reason as the head cover (5).
Hard to get inside. Thus, by suppressing the invasion of these foreign substances into the head cover (5), the lubricating oil is less likely to be contaminated, and the service life thereof is extended.

(Invention of claim 2) The invention of claim 2 has the following operation and effect in addition to the operation and effect of the invention of claim 1. << 3 >> Fuel does not easily enter the head cover (5) from the fitting portion between the connection pipe (20) and the fuel inlet pipe (14). As is clear from FIG. 2, the fuel flowing into the head cover (5) from the fitting portion between the connecting pipe (20) and the fuel inlet pipe (14) is received by the O-ring (22), and inside the head cover (5). It is hard to invade. As described above, by suppressing the entry of fuel into the head cover (5), the lubricating oil is less likely to be contaminated, and the service life thereof is extended.

(Invention of claim 3) The invention of claim 3 has the following operation and effect in addition to the operation and effect of the invention of claim 1 or 2. << 4 >> The head cover (5) can be easily attached and detached. As is apparent from FIG. 2, the fuel supply pipe (12) and its connection pipe (2)
When the head cover (5) is attached to and detached from the cylinder head (3) in a state in which the annular elastic seal (2) is not inserted into the annular elastic seal (21), the annular elastic seal (2) is inserted into the connection pipe insertion hole (19).
The inner end (21a) of the annular elastic seal (21) does not get caught on the protruding end (14a) of the fuel inlet pipe (14) even when (1) is still fitted. For this reason, it is not necessary to insert and remove the annular elastic seal (21) when attaching and detaching the head cover (5), and the attachment and detachment of the head cover (5) can be easily performed.

(Invention of claim 4) The invention of claim 4 provides the effect of any one of claims 1 to 3,
The following operational effects are obtained. << 5 >> The direction of the fuel inlet pipe (14) with respect to the connection pipe insertion hole (19) can be set appropriately. As shown in FIG. 1, the fuel injection nozzle (13) is screwed into the nozzle insertion hole (33) in order to push the fuel injection nozzle (13) into the nozzle insertion hole (33) of the cylinder head (3) and fix it. Fuel inlet pipe for connecting pipe insertion hole (19)
The direction of (14) can be set appropriately. For this reason, the connecting pipe (20) is in a proper posture in the connecting pipe insertion hole (19), and a proper sealing force of the annular elastic seal (21) can be secured.

<6> The position and orientation of the fuel inlet pipe (14) with respect to the connection pipe insertion hole (19) can be set appropriately. As is clear from FIG. 3 (C), the holding bolt (47)
Even if the tightening torque is insufficiently controlled and the tightening torque is too strong, the lever (46) is received by the stopper (49), so that the pushing force (46a) shown in FIG. The deformation and excessive pushing of the fuel injection nozzle (13) are unlikely to occur, and the position and orientation of the fuel inlet pipe (14) with respect to the connecting pipe insertion hole (19) can be set appropriately. For this reason, the connecting pipe (20) takes an appropriate position and posture in the connecting pipe insertion hole (19), and a proper sealing force of the annular elastic seal (21) can be secured.

(Invention of claim 5) The invention of claim 5 has the following effect in addition to the effect of the invention of claim 4. << 7 >> The proper orientation of the fuel inlet pipe (14) with respect to the connecting pipe insertion hole (19) can be maintained. As shown in FIG. 3 (A), since the fuel injection nozzle (13) is prevented from rotating, as is apparent from FIG. 2, the proper direction of the fuel inlet pipe (14) with respect to the connecting pipe insertion hole (19) is adjusted. Can be maintained.
Therefore, the connecting pipe (20) is maintained in a proper posture in the connecting pipe insertion hole (19), and a proper sealing force of the annular elastic seal (21) is maintained.

[0018]

Embodiments of the present invention will be described with reference to the drawings. 1 to 5 are diagrams illustrating a multi-cylinder vertical diesel engine according to an embodiment of the present invention. The configuration of the diesel engine (1) is as follows.

As shown in FIG. 1, a cylinder block (2)
A cylinder head (3) is mounted on the upper part of the cylinder head, and a head cover (5) is mounted on the upper part of the cylinder head (3). A piston (31) is fitted in the cylinder (30) of the cylinder block (2), and a cavity is provided in the piston (31).
(32) is formed. This diesel engine (1)
Has a valve operating device (4) and a fuel supply device.

The structure of the valve gear (4) is as follows.
As shown in FIG. 1, the valve operating device (4) sequentially passes through a tappet (43), a push rod (41), a rocker arm (40), and a valve bridge (42) shown in FIG. 4 from a valve operating cam (36). To open and close the intake valve (26) and the exhaust valve (27). 1 and 4, reference numeral (40a) denotes an input end of the rocker arm (40), and (40b) denotes an output end. As shown in FIG. 4, the rocker arm (40) includes a rocker arm bracket.
It is pivotally supported by a rocker arm pivot (39) supported by (37). As shown in Fig. 1, rocker arm bracket
(37) is fixed to the upper surface of the cylinder head (3) by fixing bolts (38). The rocker arm bracket (37) and the rocker arm (40) are housed in the head cover (5).

The structure of the fuel supply device is as follows.
The fuel supply device includes a fuel supply pump as shown in FIG.
A fuel supply pipe (12) led out from (not shown) and a fuel injection nozzle (13) are provided. The fuel supply pipe (12) is provided with a connecting pipe (20) at an outlet end thereof. The fuel injection nozzle (13) is oriented along the cylinder center axis (44),
It is attached to the nozzle insertion hole (33) of the cylinder head (3). The fuel injection nozzle (13) is provided with a fuel inlet pipe (14).
And the nozzle part (13a) and the overflow fuel outlet pipe (1
5). The fuel inlet pipe (14) projects laterally from the peripheral side surface of the fuel injection nozzle (13). The nozzle portion (13a) is provided at the lower end of the fuel injection nozzle (13), and faces the cavity (32) of the piston (31). The overflow fuel outlet pipe (15) is provided at the upper end of the fuel injection nozzle (13). Fuel injection nozzle (1
3) is accommodated in the head cover (5).

An outlet insertion pipe (15a) is formed in the ceiling wall of the head cover (5), and an overflow fuel outlet pipe (15) is vertically inserted therein. Outlet pipe insertion hole (1
5a) and the gap between the overflow fuel outlet pipe (15)
The annular elastic seal (1) fitted inside the outlet pipe insertion hole (15a)
5b). Peripheral side wall of head cover (5)
(5a) is provided with a connection pipe insertion hole (19), and the fuel inlet pipe (14) of the fuel injection nozzle (13) is connected to the connection pipe insertion hole (19).
Is aimed at. On the other hand, the connecting pipe of the fuel supply pipe (12)
(20) is penetrated by the connecting pipe insertion hole (19). As shown in FIG. 2, a hexagonal nut-shaped tool engaging portion (20a) is provided on an outer portion of the head cover of the connecting tube (20). The inside of the head cover of the connection pipe (20) is externally fitted and screwed to the fuel inlet pipe (14) of the fuel injection nozzle (13). By this screwing, the fuel outlet of the fuel supply pipe (12) and the fuel inlet of the fuel inlet pipe (14) are connected in abutting manner. An O-ring (22) is provided between the fitting surfaces of the connection pipe (20) and the fuel inlet pipe (14). This O-ring (22)
Is fitted in a groove (23) formed in the fuel inlet pipe (14).

An annular elastic seal is provided in the connection pipe insertion hole (19).
(21) is fitted inside. This annular elastic seal (21)
These are: an insertion hole side pressure contact portion (21b) pressed against the inner peripheral surface of the connection pipe insertion hole (19); a connection pipe side pressure contact portion (21c) pressed against the outer peripheral surface of the connection tube (20); An elastic portion (21d) interposed therebetween and a shape retaining material (21e) for retaining the insertion hole side pressure contact portion (21b) are provided. This annular elastic seal (21)
The inner end (21a) of the fuel injection nozzle (13) is retracted in the direction in which the fuel inlet pipe (14) projects from the projecting end (14a) of the fuel inlet pipe (14). Connection tube insertion hole (19) and connection tube
The gap with (20) is sealed by this annular elastic seal (21). An annular elastic seal (21) rather than a tool engagement portion (20a)
At a position closer to the outer periphery of the head cover of the connecting pipe (20), a tool receiving flange (20) having a diameter larger than that of the tool engaging portion (20a) is provided.
b) is provided. This tool receiving flange (20b)
Is formed to be larger in diameter than the elastic portion (21d) of the annular elastic seal (21) and the press-contact portion (21c) on the connection pipe side, so that these are not damaged by the tool, Is prevented from being pushed open.

The fixing structure of the fuel injection nozzle (13) is as follows. As shown in FIG. 1, the rocker arm bracket (37) is provided with a nozzle holder (48). The nozzle retainer (48) includes a lever (46) and a retaining bolt (4).
7). As shown in FIG.
6) is formed in the shape of a flat plate and has a detent hole (6
0) is formed, a bolt insertion hole (59) is formed at the center, and a pin engagement hole (64) is formed at the base end. FIG.
As shown in (1), the holding bolt (47) has a nut serving as a pressing portion (54) at the upper end thereof. The base end of the lever (46) is mounted on the rocker arm bracket (37), and a knock pin (63) driven into the rocker arm bracket (37) is fitted to the pin fitting portion (64). FIG. 3 (A)
As shown in the figure, a detent hole (60) at the tip of the lever (46)
The flat shaft portion (28) of the fuel injection nozzle (13) is fitted inside. As shown in FIG. 3 (B), the tip of the lever (46) is connected to the pressure receiving surface (58) of the fuel injection nozzle (13) at the lower part on both sides of the flat shaft part (28) of the fuel injection nozzle (13). I'm in contact.

As shown in FIG. 1, the holding bolt (47)
Is set up on the cylinder head (3), and its upper end is
(46) is inserted through the bolt insertion hole (59), and the pressing portion (47)
The central portion of the lever (46) is pressed from above by a nut. For this reason, the base end of the lever (46) is
1), the center is the point of force (53), the tip is the point of action (52)
The pressure receiving surface (58) of the fuel injection nozzle (13) is pressed by the action point (52), and the fuel injection nozzle (13) is pushed into the nozzle insertion hole (33) and fixed to the cylinder head (3). Is done. Copper packing is installed at the far end of the nozzle insertion hole (33).
(61) is provided, and the fuel injection nozzle (13) is pressed against this. As shown in FIGS. 3A and 3C, a stopper (49) is provided on the rocker arm bracket (37). The stoppers (49) are arranged on both sides of the holding bolt (47), and receive the point of force (53) of the lever (46).
For this reason, the lever (46) is hardly distorted, and the pushing force (46a) of the fuel injection nozzle (13) shown in FIG. 1 is hard to deviate from an appropriate value.

As shown in FIG. 3D, a bolt fitting groove seat (50) is formed in the rocker arm bracket (37), and a holding bolt (47) is fitted therein. Therefore, the rocker arm bracket (37) is prevented from rotating by the holding bolt (47). Also, as shown in FIG. 1, the rocker arm bracket (37) is attached to the cylinder head.
The pressing force of the fixing bolt (38) fixed to (3) and the pressing force of the fulcrum (51) of the lever (46) are opposite to each other of the rocker arm bracket (37) sandwiching the rocker arm pivot (39). Acts on points (67) and (68). For this reason, when the rocker arm (40) is actuated, lifting of the mutually opposite portions (67) and (68) of the rocker arm bracket (37) is suppressed, and a shift in intake and exhaust timing due to this is suppressed. Reference numeral (69) in FIG. 1 denotes a lubricating oil supply passage to the rocker arm (40).

Note that, as shown in FIG.
A plug insertion hole (34) is formed in (3), into which a glow plug (35) is inserted.
It faces the cavity (32) of 1). As shown in FIG. 5, the fuel injection axes (70) (70) adjacent to the fuel injection nozzle (13) when viewed in a direction parallel to the cylinder center axis (44).
Passes on both sides of the glow plug (35). For this reason,
Direct injection of the injected fuel into the glow plug (35) is unlikely to occur, and burnout of the glow plug (35) due to this can be suppressed.

[Brief description of the drawings]

FIG. 1 is an upper longitudinal sectional front view of an engine according to an embodiment of the present invention.

FIG. 2 is a vertical sectional front view of a main part of the engine of FIG. 1;

3A is a sectional view taken along line AA of FIG. 1, FIG. 3B is a sectional view taken along line BB of FIG. 1, and FIG. 3C is a sectional view taken along line CC of FIG. FIG. 3 (D) is a sectional view taken along line DD of FIG.

FIG. 4 is a plan view of the engine of FIG. 1 with a head cover removed.

FIG. 5 is a schematic diagram illustrating the directions of a glow plug and a fuel injection axis of the engine of FIG. 1;

FIG. 6 is a diagram corresponding to FIG. 2 of the prior art.

[Explanation of symbols]

(3) Cylinder head, (5) Head cover, (5a)
(12) Fuel supply pipe, (13) Fuel injection nozzle, (14) Fuel inlet pipe, (14a) Projecting end, (19)
... connecting tube insertion hole, (20) ... connecting tube, (20a) ... tool engaging portion, (20b) ... tool receiving flange, (21) ... annular elastic seal, (21a) ... inner end, (22) ... O-ring, (33)…
Nozzle insertion hole, (46) ... lever, (46a) ... pushing force,
(47) ... holding bolt, (48) ... nozzle holding tool, (4
9) ... stopper, (52) ... action point, (53) ... force point,
(54) ... pressing part.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F02M 55/02 350 F02M 55/02 350Z 350A 61/16 61/16 K F-term (Reference) 3G024 AA04 BA00 BA21 DA02 FA08 FA15 GA26 GA35 3G066 AA07 AB02 AD12 BA39 BA56 CB05 CD04 CD10

Claims (5)

[Claims] 1. A fuel injection nozzle in a head cover (5).
(13), a connection pipe insertion hole (19) is provided in the peripheral side wall (5a) of the head cover (5), and a fuel inlet pipe (14) projecting from the peripheral side face of the fuel injection nozzle (13) is inserted into the connection pipe. Hole (19)
Connecting pipe provided at the outlet end of the fuel supply pipe (12)
(20) is passed through the connection pipe insertion hole (19).
A tool engaging portion (20a) is provided on an outer portion of the head cover of (20), and a portion of the connection pipe (20) inside the head cover is connected to a fuel inlet pipe.
In the engine provided with the fuel injection nozzle, which is fitted and screwed into (14) and the annular elastic seal (21) is fitted in the connection pipe insertion hole (19), the tool engaging portion (20a) Also, at a position near the annular elastic seal (21), a tool receiving flange having a diameter larger than that of the tool engaging portion (20a) is formed on an outer portion of the head cover of the connecting pipe (20).
An engine provided with the fuel injection nozzle provided with (20b). 2. An engine equipped with a fuel injection nozzle according to claim 1, wherein said connecting pipe (20) and a fuel inlet pipe.
An engine provided with a fuel injection nozzle, wherein an O-ring (22) is provided between the fitting surfaces with (14). 3. An engine provided with a fuel nozzle according to claim 1, wherein an inner end (21a) of said annular elastic seal (21) is connected to a protruding end (21) of said fuel inlet pipe (14). 14a) than the fuel inlet pipe (1
An engine provided with a fuel injection nozzle, which is retracted in the projecting direction of 4). 4. An engine equipped with a fuel injection nozzle according to claim 1, wherein a nozzle presser (48) having a lever (46) and a presser bolt (47) is provided. Pressing part (54) of bolt (47)
The fuel injection nozzle (13) is pushed into the nozzle insertion hole (33) of the cylinder head (3) at the point of application (52) of the lever (46) by pressing the power point (53) of the lever (46) with the lever. The fuel injection nozzle (13) is fixed to the cylinder head (3) by the pushing force (46a), and the lever (49) is
(46) An engine provided with a fuel injection nozzle, wherein the engine is received. 5. An engine provided with a fuel injection nozzle according to claim 4, wherein an operating point (5) of said lever (46) is provided.
An engine provided with a fuel injection nozzle, wherein the fuel injection nozzle (13) is prevented from rotating in 2).