JPH11223169A - Diesel engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a function of a nozzle pressing tool by adding a new function suppressing a lift of a rocker arm bracket to the nozzle pressing tool. SOLUTION: In a diesel engine provided with a nozzle pressing tool 3 provided with a lever 1 and a pressing bolt 2, the pressing bolt 2 is screwed into a cylinder head 4, and when a working point part 6 of the lever 1 is pressed by means of a pressing part 5 in the pressing bolt 2, a fuel injection nozzle 8 is pressed into a nozzle insertion hole 9 by means of a working point part 7 of the lever 1, so that the fuel injection nozzle 8 is fixed to the cylinder head 4. In this diesel engine, a fulcrum point part 10 of the lever 1 is brought into contact with a rocker arm bracket 11, and by means of the fulcrum point part 10, the rocker arm bracket 11 is pressed inward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a diesel engine.

[0002]

2. Description of the Related Art FIG. 4 shows a prior art of a diesel engine. This is configured as follows, as in the present invention. Lever (101) and holding bolt (10
2) a nozzle presser (103) having: a presser bolt (102) is screwed to a cylinder head (104);
Lever (101) with pressing part (105) of holding bolt (102)
When the power point (106) is pressed, the lever (10)
The fuel injection nozzle (108) is pushed into the nozzle insertion hole (109) at the action point (107) of (1), and the fuel injection nozzle
(108) is fixed to the cylinder head (104).

In this prior art, a fulcrum of a lever (101) is used.
(110) is a projection provided on the cylinder head (104).
(122).

[0004]

The above prior art has the following problems. In the above prior art, the nozzle holding member (10
3) has only a function of fixing the fuel injection nozzle (108), and the functionality of the nozzle holder (103) is low.

[0005] An object of the present invention is to provide a diesel engine that can enhance the functionality of a nozzle retainer.

[0006]

The main structure of the invention of claim 1 is as follows (see FIG. 1). That is, leverage
Nozzle retainer (3) having (1) and retainer bolt (2)
The holding bolt (2) is screwed to the cylinder head (4), and the pressing portion (5) of the holding bolt (2) presses the power point (6) of the lever (1), so that the lever ( Action point of 1)
In (7), the fuel injection nozzle (8) is pushed into the nozzle insertion hole (9) so that the fuel injection nozzle (8) is fixed to the cylinder head (4). Fulcrum (10) is rocker arm bracket (11)
And the rocker arm bracket (11) is held down by the fulcrum (10).

[0007]

Operation and Effect of the Invention (Invention of Claim 1) The following operation and effect can be obtained (see FIG. 1A). Lever (1) fulcrum (1
Since the rocker arm bracket (11) is pressed at (0), the lifting of the rocker arm bracket (11) when the rocker arm (23) is operated is suppressed. As described above, a new function of suppressing the lifting of the rocker arm bracket (11) is added to the nozzle holder (3), and the functionality of the nozzle holder (3) is enhanced.

Since the rocker arm bracket (11) is prevented from rising when the rocker arm (23) is actuated, the wobble thereof is suppressed, and the fluctuation of the opening / closing timing of the valve (27) due to this is suppressed. Therefore, an appropriate intake / exhaust timing can be accurately set, and good combustion can be realized.

(Invention of claim 2) The following operation and effect can be obtained (see FIG. 1A). Holding force
(13) and (14) are opposite parts (16) and (1) of the rocker arm bracket (11) with the rocker arm pivot (15) interposed therebetween.
7), the lifting of the opposing parts (16) and (17) when the rocker arm (23) is operated is suppressed. As described above, the nozzle holding member (3) is provided with a new function of suppressing the floating of the opposite portions (16) and (17) of the rocker arm bracket (11), and the nozzle holding member (3)
Functionality is increased. In addition, appropriate intake and exhaust timings can be accurately set, and good combustion can be realized.

(Invention of claim 3) In addition to the effect of the invention of claim 1 or 2, the following effect is obtained (see FIGS. 1 and 3). The fuel injection nozzle (8) is prevented from rotating, and a pair of adjacent fuel injection axes (19) and (19) are connected to the glow plug (2).
0), it is difficult for the injected fuel to directly hit the glow plug (20), and burnout of the glow plug (20) due to this can be suppressed.

(Invention of claim 4) In addition to the effect of any one of the inventions of claims 1 to 3, the following effect is obtained (see FIG. 1). Since the rocker arm bracket (11) is locked by the holding bolt (2), the locking of the rocker arm bracket (11) is strengthened. in this way,
The nozzle retainer (3) is provided with a new function of strengthening the locking of the rocker arm bracket (11), and the functionality of the nozzle retainer (3) is enhanced.

(Invention of claim 5) In addition to the effect of the invention of claim 4, the following operation and effect can be obtained (see FIG. 1). A part of the peripheral surface of the holding bolt (2) is fitted into the locking groove (21) of the rocker arm bracket (11), and the rocker arm bracket (11) is prevented from rotating.
The bottom surface of the rocker arm bracket (11) can be made narrower than when the holding bolt (2) is inserted through the rocker arm bracket (11) or when the knock pin is inserted into the bottom surface of the rocker arm bracket (11). The size of the bracket (11) can be reduced.

[0013]

Embodiments of the present invention will be described with reference to the drawings. 1 to 3 are diagrams illustrating an embodiment of the present invention. In this embodiment, a vertical, direct-injection, four-valve, multi-cylinder diesel engine is used.

This engine is configured as follows. As shown in FIG. 1A, the cylinder block (24)
A cylinder head (4) is mounted on the upper part of the cylinder. The piston (3) is inserted into the cylinder (36) of the cylinder block (24).
7) is fitted therein, and a cavity (38) is formed on the top surface of the piston (37). A valve train (25), a valve (27), a fuel injection nozzle (8) and a glow plug (20) are assembled to a cylinder head (4), and a valve train (25) and a valve (2) are assembled.
7) and the fuel injection nozzle (8) are covered with a head cover (26).

The valve train (25) is constructed as follows. As shown in FIG. 1A, a rocker arm bracket (11) is mounted on a cylinder head (4), and a fixing bolt (12) is inserted through the rocker arm bracket (11). The rocker arm bracket (11) is screwed onto the head (4), and the rocker arm bracket (11) is pressed down by the bolt head of the fixing bolt (12), so that the rocker arm bracket (11) is fixed to the cylinder head (4). A rocker arm pivot (15) is penetrated and fixed to the rocker arm bracket (11), and a rocker arm (23) is swingably attached to the rocker arm pivot (15). The input end (23a) of the rocker arm (23)
The output end (23b) of the rocker arm (23) is brought into contact with the valve bridge (30) by the contact with the push rod (29) interlocked by the valve cam (28), and is pushed by the valve cam (28). A valve is connected via a rod (29) and a rocker arm (23) in order.
(27) is opened. The closing of the valve (27) is performed by a valve spring (31).

As shown in FIG. 2, the valve (27) comprises a pair of intake valves (32) (32) and a pair of exhaust valves (33) (33). A valve bridge (30) is erected between a pair of intake valves (32) and (32), and a valve bridge (30) is erected between a pair of exhaust valves (33) and (33). Have been.
As shown in FIG. 1A, a nozzle insertion hole (9) and a plug insertion hole (35) are formed in the cylinder head (4), and a fuel injection nozzle (8) is inserted into the nozzle insertion hole (9). The glow plug (20) is inserted into the plug insertion hole (35). The fuel injection nozzle (8) is oriented parallel to the cylinder center axis (18), and the glow plug (20) is oriented in the cylinder center axis.
The direction is inclined with respect to (18). The glow plug (20) is fixed to the cylinder head (4) by screw fitting.

The fuel injection nozzle (8) is fixed as follows. As shown in FIG. 1 (A), a nozzle retainer (3) having a lever (1) and a retainer bolt (2) is provided.
The holding bolt (2) is screwed to the cylinder head (4), and the pressing portion (5) of the holding bolt (2) presses the force point portion (6) of the lever (1), so that the lever (1) is pressed. The fuel injection nozzle (8) is pushed into the nozzle insertion hole (9) at the action point (7), and the fuel injection nozzle (8) is fixed to the cylinder head (4).

The lever (1) is formed in a plate shape and has a fulcrum at one end.
(10), an action point (7) at the other end, and a power point (6) in the middle. Nut (3) is attached to holding bolt (2).
9) is screwed freely and this nut (39) is a lever
The power point (6) of the lever (1) is pressed by the fastening force of the nut (39). nozzle
(8) has a rocker arm bracket (11)
It is arranged on the opposite side of the push rod (29).

As shown in FIG. 1 (B), when viewed in a direction parallel to the cylinder center axis (18), the pressure receiving surfaces (40) (40) are located at the left and right positions of the shaft (41) of the fuel injection nozzle (8). ) Is provided,
An elongated hole (44) is provided at one end of the lever (1).
The flat shaft portion (41) of the fuel injection nozzle (8) is inserted through (44), and a pair of action points (7) (7) is provided on the left and right of the long hole (44).
Are formed. A pair of left and right application points (7) is brought into contact with the pressure receiving surfaces (40) and (40), and the pressure receiving surfaces (4) are
The fuel injection nozzle (8) is pushed into the nozzle insertion hole (9) by pressing the (0) and (40). The application points (7) and (7) are formed into a convex arcuate surface toward the pressure receiving surfaces (40) and (40), and the pressure receiving surfaces (40) and (40) The deviation of the pressure receiving point is suppressed. The fuel injection nozzle (8) is received at the deep end of the nozzle insertion hole (9) via a copper packing (42) and is fixed to the cylinder head (4).

The nozzle holding member (3) is a fuel injection nozzle.
In addition to the function of fixing (8) to the cylinder head (4), the following functions are provided. The fulcrum (10) of the lever (1) is brought into contact with the rocker arm bracket (11), and the fulcrum is
The rocker arm bracket (11) is pressed down at (10). Projection (43) on top of rocker arm bracket (11)
The projection (43) is provided with a fulcrum (10) of the lever (1).
Is mounted, and the lever (1) is installed above the bolt head of the fixing bolt (12) in a direction orthogonal to the fuel injection nozzle (8). The fulcrum (10) of the lever (1) is prevented from rotating by a knock pin (45) so that the posture of the lever (1) does not shift.

The pressing force (13) by the fixing bolt (12) for fixing the rocker arm bracket (11) to the cylinder head (4) and the pressing force (14) by the fulcrum (10) of the lever (1) correspond to the rocker arm. Opposite points (16) of the rocker arm bracket (11) sandwiching the pivot (15)
Acts on (17). Of the mutually opposite points (16) and (17),
At the point (16) near the fuel injection nozzle (8), a fixing bolt (1)
2) is penetrated, and the point (1) near the push rod (29)
7) is provided with a projection (43), and this projection (43) is leveraged.
The fulcrum (10) of (1) is placed. Push rod
(29) A lubricating oil supply passage (34) to the rocker arm (23) is provided in a location (17) closer to the lubricating oil supply passage, and a lubricating oil supply passage is provided in the cylinder head (4) below the location (17). A lubricating oil introduction passage (34) and a lubricating oil supply passage (4)
6) are communicated at the boundary between the cylinder head (4) and the rocker arm bracket (11). The pressing force (14) of the fulcrum (10) of the rocker arm bracket (1) suppresses leakage of lubricating oil from the boundary.

As shown in FIG. 1 (B), the fuel injection nozzle (8) is prevented from rotating at the point of application (7) of the lever (1), and as shown in FIG. A pair of adjacent fuel injection axes of the fuel injection nozzle (8) viewed in a parallel direction
(19) (19) passes on both sides of the glow plug (20).
As shown in FIG. 1 (B), the flat shaft portion (41) has a long hole (4).
The fuel injection nozzle (8) is prevented from rotating by being inserted through (4).

The rocker arm bracket (11) is prevented from rotating by the holding bolt (2). The holding bolt (2) is arranged between the fixing bolt (12) and the fuel injection nozzle (8). Locking groove (21) in rocker arm bracket (11)
A part of the peripheral surface of the holding bolt (2) is engaged with the locking groove (21), and the rocker arm bracket (11) is provided.
Is stopped.

[Brief description of the drawings]

FIG. 1 is a view for explaining an engine according to an embodiment of the present invention. FIG. 1 (A) is a longitudinal sectional view of a main part, and FIG.
1A is a cross-sectional view taken along the line BB, and FIG.
1D is a cross-sectional view taken along a line DD in FIG. 1A.

FIG. 2 is a plan view of a main part of the engine of FIG. 1 with a head cover removed.

FIG. 3 is a schematic diagram illustrating the directions of a glow plug and a fuel injection axis of the engine of FIG. 1;

FIG. 4 is a longitudinal sectional view of a main part of an engine according to the related art.

[Explanation of symbols]

(1) Lever, (2) Holding bolt, (3) Nozzle holding tool, (4) Cylinder head, (5) Pressing part, (6) Power point, (7) Working point, (8) fuel injection nozzle, (9) nozzle insertion hole, (10) fulcrum, (11) rocker arm bracket, (12) fixing bolt, (13) (14) pressing force, (15) ... rocker arm pivot, (16) (17) ... mutually opposite parts, (18) ... cylinder center axis, (19) ... fuel injection axis, (20) ... glow plug, (21) ... locking groove.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Aoshima 64 Ishizukitamachi, Sakai-shi, Osaka Inside Kubota Sakai Works

Claims (5)

[Claims] 1. A nozzle holding device (3) having a lever (1) and a holding bolt (2), the holding bolt (2) being screwed to a cylinder head (4), and pressing the holding bolt (2). Department
By pressing the power point (6) of the lever (1) with (5),
The fuel injection nozzle (8) is pushed into the nozzle insertion hole (9) at the application point (7) of the lever (1), so that the fuel injection nozzle (8) is fixed to the cylinder head (4). In the diesel engine, the fulcrum (10) of the lever (1) is connected to the rocker arm bracket (1).
(1) The rocker arm bracket (11) is held down by its fulcrum (10). 2. The diesel engine according to claim 1, wherein the rocker arm bracket (11) is connected to the cylinder head.
Pressing force by fixing bolt (12) fixed to (4)
(13) and the holding force by the fulcrum (10) of the lever (1)
(14) are opposite parts (16) (17) of the rocker arm bracket (11) with the rocker arm pivot (15) interposed therebetween.
What acts on 3. The diesel engine according to claim 1, wherein the fuel injection nozzle is provided at a point of application of the lever.
(8) is prevented from rotating, and a pair of fuel injection axes (19) and (19) adjacent to the fuel injection nozzle (8) pass through both sides of the glow plug (20). 4. The diesel engine according to claim 1, wherein the holding bolt (2) stops the rocker arm bracket (11) from rotating. 5. The diesel engine according to claim 4, wherein a locking groove (21) is provided in the rocker arm bracket (11), and a part of a peripheral surface of the holding bolt (2) is engaged with the locking groove (21). The rocker arm bracket (11) is locked together.