JPS6029648Y2 - Mounting structure of fuel injection device - Google Patents

Description

[Detailed description of the invention] The present invention enables fuel to be pumped by reciprocating a plunger within a barrel, and at the same time, an annular valve is fitted on the outside of the plunger, and the annular valve and the plunger are connected as appropriate. The amount of fuel to be injected is controlled by relatively rotating a metering operation member to change the opening and closing timing of an oil passage communicating with the top surface of the plunger, and the annular valve is controlled by an appropriate timer operation member. A fuel injection pump X capable of controlling fuel injection timing by relative displacement in the axial direction; and a metering operation member connected to the metering operation member of the fuel injection pump X via an appropriate link mechanism. a metering solenoid that acts to control the amount of fuel injection; and a timer solenoid that is connected to the timer operating member via an appropriate link mechanism and that acts to cause the timer operating member to control the injection timing. The present invention relates to a mounting structure for a fuel injection device having the following.

In addition, the present invention prevents abnormal wear and corrosion of the link mechanism due to adhesion of dust or moisture in such a fuel injection device, and maintains smooth operation over a long period of time. , was created for the purpose of proposing a mounting structure that suppresses the temperature rise of the solenoid part and stabilizes the solenoid characteristics. A fuel injection pump, a metering solenoid, and a timer solenoid are mounted on a gear case located close to a cooling fan of the engine body, and each link mechanism is hermetically arranged within the gear case. It is.

Hereinafter, the mounting structure of the fuel injection device of the present invention will be explained based on the embodiment shown in FIGS. 1 to 5. In FIG. An internal combustion engine device is shown.

This fuel injection device 2 is a three-cylinder in-line fuel injection pump X.
, a metering control mechanism (2) for controlling the injection amount of the fuel injection pump X, and a timer control mechanism W for controlling the injection timing.

As shown in FIGS. 2 and 5, the fuel injection pump By reciprocating the fuel in the fuel chamber 44 with the spring force of the plunger spring 49, the fuel in the fuel chamber 44 is transferred to the fuel pressurizing chamber 4 formed on the top surface 33a of the plunger 33.
6, pressurizes it, and force-feeds it to the slinging side via the delivery valve 45, while allowing it to slide and rotate freely to the outside of the plunger 33 within the annular valve housing chamber 34 formed in the middle part of the barrel 31. accommodating a fitted annular valve 35;
The plunger 33 is connected to the annular valve 35.
The diagonal groove of the oil passage hole 40 is formed across the top surface 33a and side circumferential surface 33b of the plunger 33 by appropriately rotating the plunger rotation wheel 36 attached to the middle part of the plunger 33 with a metering rod 37. By changing the communication timing between the shaped reed 41 and the spill hole 43 of the annular valve 35 to change the timing of the release of fuel, the amount of fuel injection can be controlled by controlling the amount of fuel injected. The fuel suction hole 4 is displaced in the axial direction by 79 and communicates with the oil passage hole 40.
Three sets of pump single cylinder units 29 are arranged in parallel inside the pump body 30, and the fuel injection timing can be controlled by changing the timing of opening and closing of the pump 4.

In addition, in FIG. 2 and FIG. 5, the reference numeral 48 is a tappet;
0 is a spring receiver, and 51 is a single cylinder unit for each pump by rotating the annular valve 35 by a minute angle.
55 is a fuel passage, 81 is a timer pin 7.
9 is rotatably supported by a bearing, 85 is a timer pin 79
A boss member for attaching the pump body to the pump body 30 side is shown.

The metering control mechanism (■) is for controlling the amount of fuel injected by moving the metering rod 37 of the fuel injection pump X back and forth appropriately according to the rotational state of the engine. Detects a metering solenoid 21 having an actuator 25 that is moved forward and backward by an electrical signal transmitted, and the amount of movement of the actuator 25 of the metering solenoid 21 (in other words, the injection amount of the fuel injection pump X). It has a metering potentiometer 23 and a metering link mechanism 60 to connect the actuator 25 and the metering rod 37 of the fuel injection pump X.

This metering link mechanism 60 includes a second metering lever 62 that engages a protrusion 38 of a metering rod 37 and a protrusion 2 of an actuator 25.
7 and a second metering lever 63 that engages are connected by a rotation shaft 61, and the metering rod 37 is moved back and forth appropriately according to the amount of movement of the actuator 25 to move the plunger 33 into an annular shape. Valve 3
It can be rotated relative to 5.

Note that the metering potentiometer 23 is the metering solenoid 2.
1 is integrally combined with 1.

Also, this metering solenoid and metering potentiometer 2
3 are electrically connected to the controller 6, respectively.

Does the timer control mechanism W include each timer pin of the fuel injection pump X? 9, 79.79 is used to control the fuel injection timing by appropriately rotating the engine according to the rotational state of the engine, and it is moved forward and backward by an electrical signal transmitted according to the rotational state of the engine. a timer solenoid 22 having an actuator 26, a timer potentiometer 24 for detecting the amount of advance and retreat of the actuator 26 (in other words, fuel injection timing), the actuator 26 and each pump single cylinder unit 29. , 29.29, and a timer link mechanism 70 for connecting timer pins 79, 79.79.

This timer link mechanism 70 has a protrusion 2 of the actuator 26.
8 and the second timer lever 7 attached to each timer pin 79°79.79.
8.78.78 and the second lever for the timer 78.78
．． A connecting rod 75 for interlocking operation of 78, and the connecting rod 7
5, and a rotation shaft 72 that connects the third lever 71 for timer and the third lever 73 for timer. The timer pins 79, 79, 79 can be rotated at the same time.

The timer solenoid 22 and the timer potentiometer 24 are electrically connected to the controller 6 in the same way as the metering solenoid 21 and metering potentiometer 23.

This controller 6 also includes a flywheel 4 of the engine body 1.
A rotation sensor 5 mounted on the engine is connected to the engine, and the rotational state of the engine detected by the rotation sensor 5 is transmitted to a controller 6 as an input signal.

The fuel injection pump X, the metering control mechanism (2), and the timer control mechanism W are each attached to a gear case 10 attached to the engine body 1 side.

As shown in FIG. 3, the gear case 10 is integrally formed into an appropriately sized housing with one side open.
The opening end Inc is a mounting surface 10c to the engine main body 1 side.

Furthermore, this gear case 10 is divided into two internal chambers by a partition wall 11, namely, a relatively wide gear chamber 12 with an opening on the mounting surface 10c side and a relatively narrow link chamber 13 with an opening 18 on the side wall 10a side of the gear case 10. It is divided.

Note that this opening 18 is sealed with M2S.

The gear chamber 12 houses the crankshaft 8, camshaft 9, etc., and the link chamber 13 houses the link mechanisms 60, 70, etc.
A portion of it is accommodated.

Further, a pump mounting hole 14 is formed toward the camshaft 9 side at a position corresponding to the gear chamber 12 on the peripheral wall 10a of the gear case 10, and the fuel injection pump Rod 37 and timer pins 79, 79.
79 is mounted with the side wall 30a on the mounting side facing the link chamber 13 (see Fig. 2).

On the other hand, at a position corresponding to the link chamber 13 on the side wall 10b of the gear case 10, there is a deep metering solenoid mounting hole 16 and a timer solenoid mounting hole 1 facing toward the link chamber 13.
7 is formed.

Both solenoid mounting holes 16 and 17 have inner diameters that are appropriately larger than the outer diameters of the metering solenoid 21 and the timer solenoid 22, respectively, and
Actuator insertion holes 19 provided in the hole bottoms 16a and 17a,
It is communicated with the link chamber 13 via 20.

Inside these solenoid mounting holes 16 and 17, a metering solenoid 21 and a timer solenoid 22 have actuators 25 and 26 protruding toward the link chamber 13 through the actuator insertion holes 19 and 20, respectively, while the rear end It is inserted in a state where it is exposed to the outside.

Also, both solenoids 21 and 22 have shoulder portions 21a and 2
2a and the hole bottom surfaces 16a, 17a, the gear case 10 is held down by the presser plate 87 with the seal member 57 interposed between the hole bottom surfaces 16a and 17a.
Fixed on the side.

Metering '/L' projected into this link chamber 13
the actuator 25 of the /id 21, the actuator 26 of the timer solenoid 22, the metering rod 37 of the fuel injection pump X protruding into the gear chamber 12, and the timer pins 79, 79, 7.
9, the metering link mechanism 60 and the timer link mechanism 70 are interposed.

Note that the rotation shafts 61 and 72 of both link mechanisms 60 and 70 are connected to sleeves 67 and 83 that are attached through the partition wall 11, respectively.
The sleeves 67, 83 are fitted into the sleeves 67, 83, and are rotatably supported by bearings 66, 66 and 84, 84 (see FIGS. 2 and 4).

Next, to explain the operation of the fuel injection device of the illustrated embodiment, the fuel injection pump The fuel is sucked into the pressurizing chamber 46, pressurized, and forcefully delivered to the cylinder side via the delivery valve 45.

On the other hand, the fuel injection amount is controlled by an electrical signal transmitted from the controller 6 in accordance with the rotational state of the engine detected by the rotation sensor 5 and the current injection amount detected by the metering potentiometer 23. Actuator 25 of solenoid 21 for
Each pump single cylinder unit 29, 29 is connected to the metering link mechanism 60 and the metering rod 37 by moving the pumps forward and backward as appropriate.
．． This is done by rotating each of the 29 plungers 33, 33.33 relative to the annular valve 35 to change the communication timing between the spill hole 43 of the annular valve 35 and the lead 41 of the plunger 33.

The injection timing is controlled by operating the timer solenoid 22 using an electrical signal sent from the controller 6 in accordance with the rotational state of the engine detected by the rotation sensor 5 and the current injection timing detected by the timer potentiometer 24. child 26
The timer link mechanism 7 is moved forward and backward as appropriate.
0 and the annular valve 3 via the timer pin 79, 79.79
5, 35, and 35 in the axial direction as appropriate to open the annular valve 3.
This is done by changing the timing of opening and closing the fuel intake hole 42 at 5.35 and 35.35.

Next, to explain the effect of the mounting structure of the fuel injection device of the present invention, according to this mounting structure of the fuel injection device, the metering link mechanism and the timer link mechanism of the fuel injection pump are each sealed in the gear case. Therefore, prevent abnormal wear or corrosion of the metering link mechanism and timer link mechanism due to dust or moisture adhering to the metering link mechanism and timer link mechanism. This has the effect that the injection amount and injection timing of the fuel injection pump can be stably controlled over a long period of time.

Furthermore, the metering solenoid and the timer solenoid are attached to the gear case located close to the cooling fan with their rear ends exposed to the outside, and the metering solenoid and timer solenoid are connected to the cooling fan. Since the generated cooling air can be forcibly cooled, it is possible to suppress the temperature rise of each solenoid and stabilize the solenoid characteristics, that is, the control characteristics of the fuel injection pump. There are also practical effects.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of an internal combustion engine device equipped with a fuel injection device according to an embodiment of the present invention, Fig. 2 is a partial cross-sectional view of the section ■-■ in Fig. 1, and Fig. 3 is a diagram showing the Fig. 2 4 is a cross-sectional view taken along IV-IV in FIG. 2, and FIG. 5 is an enlarged perspective view of the fuel injection pump and its control mechanism shown in FIG. 2. 1...Engine body, 3...Cooling fan, 10...Gear case, 21...Metering solenoid, 22...For timer Solenoid, 31... Barrel, 33... Plunger, 33a... Top surface of plunger, 35...
... Annular valve, 37 ... Metering operation member, 40 ...
...Oil hole, 60...Link mechanism, 70.
...Link mechanism, 79...Timer operating member, X...Fuel injection pump, 2...
Fuel injection device.

Claims (1)

[Scope of utility model registration request] Fuel can be pumped by reciprocating the plunger 33 within the barrel 31, while an annular valve 35 is fitted on the outside of the plunger 33, and the annular valve 35 and the plunger 33 are connected to an appropriate metering operation member. 37 to control the fuel injection amount by changing the opening/closing timing of the oil passage hole 40 communicating with the top surface 33a of the plunger 33, and the annular valve 35 is rotated by an appropriate timer operating member 79. A fuel injection pump X capable of controlling fuel injection timing by relative displacement in the direction, and a metering operation member 37 connected to the metering operation member 37 of the fuel injection pump A metering solenoid 21 that acts to control the fuel injection amount by the operating member 37 is connected to the timer operating member 79 via an appropriate link mechanism 70, and the timer operating member 79 controls the injection timing. In a fuel injection device 2 having a timer solenoid 22 that acts as if to control the fuel injection pump, the fuel injection pump
The respective link mechanisms 60 and 70 are attached to the gear case 10 located close to the gear case 1.
1. A mounting structure for a fuel injection device, characterized in that the fuel injection device is arranged in a hermetically sealed manner.