JPS5979046A - Fuel injecting apparatus for use in diesel engine - Google Patents

Abstract

PURPOSE:To enable to change the fuel injection timing independently of the valve opening timing of an aexhaust valve through shifting of tension pulleys, by disposing tension pulley to push a belt wound around a crankshaft and a cam shaft of a fuel injection pump. CONSTITUTION:A timing belt 15 is wound around a crankshaft 19 and a cam shaft 18 of a fuel injection pump. Further, tension pulleys 13, 14 are disposed in the manner of pushing the timing belt 15. These tension pulleys 13, 14 are moved forward and backward by driving actuators 16, 17 by changing the flow of pressure oil supplied to the actuators 16, 17 by means of solenoid valves 38, 39 controlled by a controller 51. With such an arrangment, the fuel injection timing is controlled by changing the relative phase of the crankshaft 19 and the cam shaft 18.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a fuel injection device 1 for use in a diesel engine, in particular 1, and a fuel injection device 1 for use in a diesel engine.
The present invention relates to a fuel injection device driven via a belt tracker.

Generally, fuel injection devices used in diesel engines are
There are two types of diesel engines: those that are gear-coupled to the crankshaft of the diesel engine and those that are driven via a timing bell.

The timing belt-driven fuel injection system includes a fuel injection pump, governor, timer, etc., a camshaft pulley attached to the camshaft of the fuel injection pump, and a diesel engine crankshaft.
It is configured to be driven by the diesel engine by winding a timing belt around the cam shaft pulley attached to the cam shaft that opens and closes the intake and exhaust gas pulleys of the diesel engine. It's coming.

However, in such a timing belt, a tensioner is provided between the camshaft pulley of the fuel injection pump and the crankshaft pulley, and the tension of the timing belt changes when the crankshaft pulley changes. The phase between the shaft and the cam shaft of the fuel injection pump is changed, in other words, the fuel injection timing is adjusted, and it is theoretically possible to omit the timer that is conventionally attached to the fuel injection pump. However, when a tensioner is used in this way, the opening and closing timing of its intake and exhaust pulps can also be changed, making it difficult to adjust the fuel injection timing with the timing belt. The adjustment was still made by a timer built into the fuel injection pump.

Furthermore, in a fuel injection device including a unit injector, the mechanism for adjusting the fuel injection timing is extremely complicated, and production costs tend to be high.

The purpose of this invention is to adjust the fuel injection timing using the timing belt without affecting the opening/closing timing of the intake and exhaust valves of the diesel engine, omit the timer conventionally assembled in the fuel injection pump, and further,
An object of the present invention is to provide a fuel injection device for use in a diesel engine that is equipped with a unit injector and adjusts the fuel injection timing of the unit injector by a simple means.

In view of these issues, the fuel injection device used in the diesel engine of the present invention includes a fuel injection pump provided in the diesel engine, a crank shaft gasket attached to the crank shaft of the diesel engine,
The camshaft groove attached to the camshaft of the fuel injection pump, the timing belt wound between the crank and camshaft pulley, and the tension side and slack side of the timing belt. The engine is configured to include a pair of tension pulleys that are pressed against the diesel engine, and an actuator that causes the pair of tension pulleys IJ' to reciprocate toward the timing belt depending on the operating conditions of the diesel engine.

Hereinafter, preferred specific examples of the fuel injection device used in the diesel engine according to the present invention will be described with reference to the drawings.

FIG. 1 schematically shows a specific example 10 of a fuel injection device used in a diesel engine of the present invention.

The fuel injection device 10 includes a size-shaped fuel injection pump and a governor provided in a diesel engine, a plurality of injection nozzles each connected to a plurality of delivery valve sides of the fuel injection pump via fuel injection pipes, and a diesel engine. The crank of
The crankshaft pulley 11 is attached to the camshaft 18 of the fuel injection pump, and the camshaft pulley 12 is attached to the camshaft 18 of the fuel injection pump. Timing belt 15, its timing
A pair of tension pulleys 13, 14 are pressed against the tension side and a slack side of the belt 15, and the pair of tension pulleys 13, 14i are pushed toward the timing belt 15 depending on the operating conditions of the diesel engine. It is composed of multiple actuators 16 and 17 for reciprocating movement.

The size fuel injection pump, governor, and injection nozzle are configured in the same way as those in the existing fuel injection device, so a description of their configuration will be omitted.

The crankshaft pulley 11 has a predetermined outer diameter and is attached to the crankshaft 19 of the diesel engine.

The camshaft pulley 12 has a larger outer diameter than the crankshaft pulley 11 and is attached to the camshaft 18 of the square fuel injection pump.

Of course, that crank and camshaft pulley II
, i2 maintain a predetermined interval and are arranged substantially on the same plane.

A timing belt 15 is wrapped around the crank and camshaft pulleys 11° and 12 to transmit power from the diesel engine to the fuel injection pump.

The pair of tension boots IJ 13 and 14 also have a smaller outer diameter than the crankshaft pulley 11, and the operating rods 30 of the actuators 16 and 17 described later.
．． 31 ends, respectively, and are arranged so as to be pressed against the tension side and the slack side of the timing belt 15, respectively.

Of course, the tension boots JI3, 14 maintain a predetermined spacing and are disposed substantially on the same plane as the crank and camshaft pulleys 11, 12, respectively.

The actuator 16,17 is a hydraulic cylinder configured to reciprocate between its tension pulleys 13, 14e, its camshaft pulley 11 and its crankshaft pulley 912, respectively, towards its timing belt 15. There is.

That is, the actuator 16.17 has a cylinder 20.21 mounted on the diesel engine side at a predetermined distance between the crankshaft pulley 11 and the camshaft pulley 12, and the cylinder 20.21. A piston 24.25 is fitted into the cylinder bore 22.23 of the cylinder 20.21 so as to be slidable back and forth, one end of which can be moved in and out of the cylinder 20.21, and the other end inserted into the piston 24.25. The control rods are composed of operating rods ao and ai connected to each other.

In its operation, the rods 30, 31 have a bore of 34°3 at one end.
A bearing part 32,33 with a bearing part 5 is in each case integrally formed.

Of course, the actuators 16, 17 are arranged in such a way that the bearing parts 32, 33'z of the operating rods ao, ai are directed toward opposite sides.

The above-mentioned pair of tension pulleys ia, t4 are rotatably attached to their bearing parts 32.33 via pins 36.37 which are fitted into bores 34.35 in the bearing parts 32, 33 of their operating ronds 30.31, respectively. It is installed.

Tension pulley ia installed in this way
, i4i reciprocating actuator 16.17 is an oil pump (not shown) driven by a diesel engine.
Powered by pressure oil from.

However, the actuator 16,17 is connected to the solenoid valve 3.
8.39, respectively.

That is, the solenoid valves 38 and 39 are connected to the inlet port 40.
and 41, outlet side ports 42.43, and 44.4
5, and selectively selects the inlet port 40 and the outlet port 42 or 43, and the inlet port 41 and the outlet port 44 or 45, respectively, according to an output signal from the controller 51, which will be described later. Configured to contact you.

Therefore, the inlet port 4o of the solenoid valve 38 is connected to the oil pot via the hydraulic pipe 46, and the outlet port 42.43 is connected to the oil pressure of the actuator 16 via the hydraulic pipe 47.48. -) 26° 27 respectively, and the inlet port 41 of the solenoid valve 39 is connected to the oil pump via the hydraulic line 46, and the outlet port 44° 4.5 is connected to the hydraulic line 49.50i. via the hydraulic ports 28, 29 of the actuator 17, respectively.

The controller 51 is a rotation speed sensor 5 of a diesel engine.
8. In response to signals from the load sensor 59, etc., these solenoid valves 38.
39'i control, and mainly consists of input and output circuits, memory circuits, arithmetic circuits, and control circuits.

Therefore, those solenoid valves 38, 39 are connected to wiring 52, 53
and 54 and 55 are respectively connected to the output circuit of the controller 51, and the rotation speed sensor 58 and the load sensor 59 are connected to the input circuit of the controller 51 through the wiring and 6"3. each connected.

Of course, those solenoid valves 38 and 39 are connected to the controller 5.
1, the tension pulleys 13, 1'4 are driven by the timing belt 15, respectively.
are moved in the same direction so as to maintain a predetermined tension on the tension side and a predetermined tension on the relaxed side. Further, an idle pulley (not shown) that is pressed against the timing belt 15 is further provided, and is configured to maintain a predetermined tension on the tension side and a predetermined tension on the slack side of the timing belt 15. It is also possible.

The controller 51 also controls the actuator 1.
6.17 drive, in other words, operation! “Rod ao,
The movement of the ai is monitored, and if a malfunction occurs, the movement is immediately corrected to ensure that the actuators 16 and 17 are always properly driven.

That is, the actuators 7716 and 1791jl are provided with potentiometers 56 and 5 for detecting the positions of the operating rods ao and ai, respectively, and the potentiometers 56 and 57 are connected to the control rods through wiring 60 and 61, respectively. , is connected to the controller 51, and its
The signals from the meters 56, 5775) are sent to the controller 5
1, the actuator 1e,
The drive of t'y has been optimized. - Next, the operation of the fuel injection timing 10 configured as described above will be described. When the diesel engine is operating, the crank shirt ← 19 rotates.

The power of the crankshaft 19 is the timing belt 1
5 to the cam shaft 18 of the fuel injection pump, the fuel injection pump is driven, and fuel compressed to high pressure by the fuel injection pump is injected from the injection nozzle.

At this time, the fuel injection timing is adjusted by changing the flow of pressure oil supplied from the oil pump to the actuator 16'', This is done by driving the tension pulleys 13 and 17 to change the position of the tension pulleys 13 and 14.

For example, when the diesel engine is idling or operating at low speed,
The controller 51 receives all signals from the rotation speed sensor 58 and the load sensor 59, and sends output signals to the solenoid valves 38 and 39 based on a preset fuel injection pattern.

When the output signal is sent to the solenoid valve 38, 39, the inlet port 40 of the solenoid valve 38 becomes the outlet port 3,
Further, the inlet side port 40 of the solenoid valve 390 is the outlet side, and the I
Pressure oil from an oil pump driven by the diesel engine is sent to the hydraulic port 27, 29 of the actuator 16, 17, respectively, and the piston 24, 25 is connected to the piston 24, 25, respectively, as shown in FIG. In other words, the tension pulleys 13 and 14 each move to the left in FIG. Become slow.

Further, when the diesel engine operates at high speed, the controller 51 inputs signals from the rotation speed/sensor 58 and the load sensor 59, and controls the solenoid valve 38, 39 based on a preset fuel injection pattern. send the output signal to.

When the output signal is sent to the solenoid valve 38, 39, the inlet port 40 of the solenoid valve 38 becomes the outlet port 42, and the inlet port 41 of the solenoid valve 39 becomes the outlet J.
- port 4 respectively, and the pressure oil from the oil pump is supplied to the hydraulic port 2 of the actuator 16.17.
6.28, whose pistons 24.25 each slide to the right in FIG.

That is, the tension pulleys 13 and 14 each move to the right in FIG. 1, the phase of the camshaft 18 relative to the crankshaft 19 is shifted to the advance side, and the fuel injection timing is advanced.

Of course, the timing belt 15 is connected to the camshaft pulley IL crankshaft pulley 12 and the pair of tension seams IJ 13 to transmit power from the diesel engine to the fuel injection pump.
, 14, the fuel injection timing is adjusted by changing the positions of the tension pulleys 13 and 14 without affecting the opening/closing timing of the intake and exhaust valves of the diesel engine. .

FIG. 2 shows another specific example 70 of the fuel injection device used in the diesel engine of the present invention.

The fuel injector 70 includes a unit injector, a feed line that supplies fuel to the unit injector.
a cam shaft 77 rotatably disposed in the cylinder head (not shown) of the diesel engine to drive the pump and its unit injectors; a crank mounted on the crank shaft 78 of the diesel engine;・Shaft pulley 71, its cam shaft 77
A camshaft pulley 72 attached to the crankshaft pulley 72, a timing belt 79 wound between the crank and the camshaft pulleys 71 and 72, and a timing belt 79 that is pressed against the timing belt 79 on the crankshaft pulley 71 side. The idle shield 3 is rotatably mounted on the diesel engine side as shown in FIG.
Pulleys 74, 75, and an actuator 76 for moving the timing belt 79' depending on the operating conditions of the diesel engine.

The unit injector and feed pump are configured similarly to those in an existing fuel injection device, so a description of their configuration will be omitted.

A cam shaft 77 is rotatably arranged in the cylinder head of the diesel engine to drive the unit injector, in other words to reciprocate the cam follower of the unit injector. .

Of course, the cam shaft 77 is separate from the cam shaft (not shown) for opening and closing the plurality of intake and exhaust valves (not shown) of the diesel engine, and the cylinder head. It is located in

A crankshaft pulley 71 is attached to a crankshaft 78 of the diesel engine with a predetermined outer diameter.

The camshaft norifle 2 has a larger outer diameter than the crankshaft pulley 71 and is mounted 9 on the camshaft 77.

Of course, the crank and camshaft pulley 71
．． 72 are kept at convenient intervals and are each arranged substantially on the same plane.

The timing belt 79 is wound once between the crank) and the camshaft pulleys 71 and 72 so as to transmit the power of the diesel engine to the camshaft 77.

The idler pulley 73 is spaced apart from the crankshaft pulley 71 at a predetermined distance so as to be pressed against the timing belt 79 on the side of the crankshaft pulley 71, and the It is rotatably attached to the diesel engine side.

The pair of tension boots IJ 74 and 75 have an outer diameter smaller than that of the crankshaft pulley 71, and are rotatably attached to the operating rod 85 of the actuator 76 to be restored at a predetermined distance. , are arranged so as to be pressed against the tension side and the relaxation side of the timing belt 79, respectively.

The actuator 76 is a hydraulic cylinder with a tension norif of 4.75i between its crankshaft pulley 71 and its camshaft cliff 2 and idler pulley 73, and its timing belt 79.
It is configured to move back and forth toward.

That is, the actuator 76 is
A cylinder 80 attached to the diesel engine side and a cylinder bore 81 of the cylinder 80 are capable of reciprocating sliding between the shaft ceiling 1 and its cam shaft ceiling 2 and idle pulley 73. It is composed of a fitted piston 84 and an operating rod 85 whose one end can be taken in and out of the cylinder 80 and whose other end is connected to the piston 84.

The operating rod 85 integrally forms a bearing portion 86 with a bore 89 on one end side, and furthermore, the bearing portion 86' is integrally provided with an elongated portion 8 at the tip thereof.
A bearing portion 88 having a diameter 90 is integrally formed at the seventh end.

The above-mentioned pair of tension pulleys 74, 75 have bores 89 in the bearing portions 86, 88 of their operating rods 85.
．． It is rotatably attached to its bearing parts 86, 88 via pins 91, 92 which are fitted into the respective bearing parts 90, 90, respectively.

Tension pulley 74 installed in this way
, 75 is driven by pressure oil from an oil pump (not shown) driven by a diesel engine, and is controlled by solenoid valves 93 and 94.

That is, the solenoid valves 93 and 94 are connected to the inlet port 95.
．． 96 and outlet ports 97 and 98, respectively, and are configured to be opened and closed, respectively, in response to a magazine output signal from a controller 103, which will be described later.

Therefore, the inlet port 95.9 of the solenoid valve 93.94
6 are respectively connected to the oil cylinders through hydraulic piping 99, and the outlet side ports of the solenoid valves 93, 94).
97 and 98 are connected to hydraulic ports 82 and 83 of the actuator 76 via hydraulic pipes ioo and 1oil, respectively.

The controller 103 includes a diesel engine rotation speed sensor (not shown), a load sensor (not shown), and a solenoid valve 93 thereof according to a preset fuel injection pattern.
, 9.4' respectively, and mainly,
It consists of input and output circuits, memory circuits, arithmetic circuits, and control circuits.

Accordingly, the solenoid valves 93, 94 are connected to the output circuit of the controller 103 by wires 104 and 105, respectively, and the sensors are respectively connected to the input circuit of the controller 1030 by wires (not shown). ing.

Next, the operation of the fuel injection device 70 configured as described above will be described. When a diesel engine is operating, the crankshaft 78 rotates.
The power is transmitted to the cam shaft 77 via the timing belt 79 to drive the unit injector and inject fuel.

At this time, the fuel injection timing is adjusted by changing the flow of pressure oil 9 supplied from the oil cylinder to the actuator 76 using the solenoid valves 93 and 94 controlled by the controller 103 to drive the actuator 76. This is done by changing the position of the tension pulleys 74, 75.

For example, when the diesel engine is idling or operating at low speed, the controller 103 inputs signals from the rotation speed sensor, load sensor, and fuel temperature sensor, and performs preset fuel injection.・
It sends an output signal to the solenoid valve 93,94 based on the turn.

When the output signal is sent to the solenoid valves 93 and 94, the flow of pressure oil from the inlet port 96 to the outlet port 98 is enabled in the solenoid valve 94, and the solenoid valve At 93, the return 9 of pressure oil from the outlet port 97 to the inlet port 95 is enabled.

That is, the pressure oil from the oil pump driven by the diesel engine increases the hydraulic pressure of the actuator 76, tr.
- Since the pressure oil on the hydraulic port 82 side is returned to the oil pump side, the piston/84 slides to the left in FIG. 2.

Therefore, the tension no'J74.75 moves to the left in FIG. 2, the camshaft foot 0 phase relative to the crankshaft 78 is shifted to the retard side, and the fuel injection timing is retarded.

Further, when the diesel engine operates at high speed, the controller 103 includes a rotation speed sensor, a load sensor,
A signal from the fuel temperature sensor is input, and an output signal is sent to the solenoid valve 93, 94 based on a preset fuel injection pattern.

When that signal is sent to the solenoid valve 9, 3, 94, pressure oil can flow from the inlet port 95 to the outlet port 97 in the solenoid valve 93, and in the solenoid valve 94, From the outlet side port 98 to the inlet side port 96
It becomes possible to return pressure oil to υ.

That is, the pressure oil from the oil pump is sent to the hydraulic pressure of the actuator 76, and the pressure oil from the hydraulic port 83 side is returned to the oil pump side, so that the piston 84' is Slide to the right in FIG.

Therefore, the tension seams IJ 74 and 75 move to the right in FIG. 2, and the 0 phase of the camshaft foot relative to the crank earft 78 is shifted to the advance side.
The timing of fuel injection becomes earlier.Of course, the timing belt 79 is connected to the camshaft pulley 71, crankshaft ceiling, etc. so as to transmit the power of the diesel engine to the camshaft 77 of the Unireto injector. 2 and the idle gorif 3, and are also held in place by a pair of tension goulifts 75, so that the tension can be adjusted without affecting the opening/closing timing of the intake and exhaust valves of the diesel engine. -By changing the positions of the pulleys 74' and 75, 1. The fuel injection timing can be adjusted.

Further, the fuel injection device 70 is provided with a potentiometer that monitors the drive of the actuator 76 in substantially the same manner as in the case of the above-described specific example 10, and the potentiometer
If the signal from the meter is configured to be fed and packed to the controller 103, the actuator 7
6 is optimized.

Further, in the above-described specific examples 10 and 70, the fuel injection pump was described as a square-type fuel injection pump and a unit injector, respectively, but it is of course possible to apply a distribution-type fuel injection pump.

According to the above invention, a fuel injection pump provided in a diesel engine and a crank
A crankshaft pulley attached to the shaft, a camshaft pulley attached to the camshaft of the fuel injection pump, a timing belt hooked between the crank and the camshaft pulley, and the camshaft pulley attached to the camshaft of the fuel injection pump. A pair of tension pulleys that are pressed against a tension side and a slack side of a timing belt, and an actuator that moves the pair of tension pulleys back and forth toward the timing belt depending on the operating conditions of the diesel engine. Since it is configured to include a timing belt, the fuel injection timing is adjusted by the timing belt without affecting the opening and closing timing of the intake and exhaust valves of the diesel engine. is omitted, and moreover, the unit
For those equipped with an injector, the fuel injection timing of the unit injector can be adjusted by simple means,
In addition, gear-driven fuel injectors such as
Gear noise caused by lash can be prevented and it will become extremely practical.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a general view showing a specific example of the fuel injection device used in the diesel engine of the present invention, and FIG. 2 is a schematic view of the fuel injection device used in the diesel engine of the present invention. FIG. 10.70... Fuel injection device used in diesel engines, 11.71... Crank shaft pulley,
12,72...Cam shaft pulley, 13.14
,74.75...Tension pulley, 15.79.
...Timing belt, 16, 17. 76... Actuator, 18, 77... Cam shaft, 19.78... Crank shaft. Beg/Zuyu L2 Zushio

Claims (1)

[Claims] A fuel injection pump provided in a diesel engine, a crankshaft pulley attached to the crankshaft of the diesel engine, and a crankshaft pulley attached to the camshaft of the fuel injection pump. a camshaft pulley; - a timing belt wound between the crank and the camshaft pulley; a pair of tension pulleys pressed against the tension and slack sides of the timing belt; and an actuator that reciprocates a pair of tension pulleys toward a timing belt depending on operating conditions.