JPS60212632A - Hydraulic control valve for fuel injection timing controller - Google Patents

Abstract

PURPOSE:To enable accurate control of an oil pressure by means of a small device and a less consumptioncurrent and to permits constitution of a variable throttle, by a method wherein a vave body is rotated with the aid of a method wherein a valve body is rotated with the aid of a step motor driven by means of a pulse signal, and the flow of oil to the hydraulic control system of an injection timing controlling device is varied. CONSTITUTION:When the oil pressure of a hydraulic control system is increased by a hydraulic control valve 100, a pulse motor 101 is driven, and high pressure oil is fed to a hydraulic control system oil passage 106 through a hole 107 in a valve body 102 and a hollo part 109 by means of an oil passage 104 on the high pressure side. Meanwhile, when the oil pressure of the hydraulic control system is decreased, the pulse motor 101 is driven, and oil in the hydraulic control system is fed to an oil passage 105 on the low pressure side through the hollow part 109 of the valve bod 102, and a hole 108 by means of the hydraulic control system oil passage 106. In which case, since the rotary angle of the step motor 101 can be arbitrarily decided by means of a pulse signal, the openings of the holes 107 and 108 to the oil passages 104 and 105 are set to size lower than a full opening, and this enables constitution of a variable throttle.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hydraulic control valve used in a fuel injection timing control device for an internal combustion engine.

(1) [Prior art] Conventionally, fuel 11] /11! used for a sentry timing control device, etc.
For example, as shown in Japanese Patent Application Laid-Open No. 57-157024, the pressure control valve operates two solenoids and a squirrel spool valve or glide valve 1, which has a large shape and increases current consumption. It was also difficult to provide a variable aperture function.

[Purpose of the invention]

The present invention provides a hydraulic control valve for a fuel injection timing control device that is small in size, consumes little current, and easily allows variable throttle control.
The main purpose of the valve is to provide M, and therefore, a valve body is attached to a valve motor driven by a pulse signal.
When increasing the oil pressure of the hydraulic control system, the oil flow is guided from the high-pressure side oil passage to the hydraulic control system oil passage, and when lowering the oil pressure of the hydraulic control system, the oil flow is guided from the high-pressure side oil passage to the hydraulic control system oil passage. It was constructed so as to lead to the 1 oil road.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a complete block diagram (2) of an embodiment of the present invention, including an injection timing adjustment device which is a hydraulic timer for a diesel engine sophisticated fuel injection pump. Figure 3 shows a detailed diagram of the hydraulic control valve.

This injection timing adjustment device includes a first eccentric cam 3 that is fitted with a driven side disc 2 that is integrally molded on a driven side shaft 1 or fixed to rotate together with the driven side shaft 1; The second eccentric cam 4 is fitted with the second eccentric cam 4. A pin 8 fixed to the drive-side disk 5 is engaged with the second eccentric cam 4, while the first
A pin 6 fixed to a piston 7 is engaged with the eccentric cam 3.

The piston 7 is fitted into a cylinder 9 which is rotatably attached to the driven shaft 1, and resiliently biased by a coil spring 0. The driven shaft 1 is connected to a camshaft 11 of an injection pump, and pressurized hydraulic oil is supplied from a high hydraulic pressure pipe 14 through a pipe 13 into a hollow portion 12 of the driven shaft 1 . The hydraulic system 14 uses hydraulic oil 16 in a tank 15.
is pressurized by the pump 17 and sent to the pipe 13 via the hydraulic control valve 100. Also, on the hydraulic oil discharge side (3
) The hydraulic oil is returned to the tank 15 from the low oil pressure pipe 20 via the oil pressure control valve 100. In such a mechanism, the /111 pressure in the hollow portion 12 of the driven shaft 1 is changed by adjusting the L-operating hydraulic pressure in the hydraulic control valve 100.

The hollow part 12 is communicated with the cylinder 9 by 1J11?821, and the position of the piston 7 can be controlled by controlling the hydraulic pressure control valve 100. When no hydraulic pressure is applied to the cylinder 9, the weight of the piston 7 The position of the screw I/N 7 also changes depending on the rotation speed. The driven side disc 2 and the driving side disc 5 are composed of two eccentric cams 3.4.
The movement of the piston 7 causes the pin 8 to move circularly around the axis of the driven shaft 1, thereby controlling the rotational angular position of the drive side disc 5. ,
That is, the advance angle can be controlled.

The hydraulic control valve 100 is connected to the control circuit r#G30, and the LI i! The injection timing is controlled to be adjusted to the advance angle value.

(4) Next, the hydraulic control valve 100 shown in FIG. 2 will be explained. [8
Figure 1 is a side view, (Figure b1 is a front sectional view. Valve body 10
The valve body 2 has holes 107 and 108 located at right angles to each other and a hollow portion 109, and is configured to be freely fitted into the body 103, and the valve body 102 is rotated in the circumferential direction by a step motor 101. In this mechanism, when the high pressure oil passage 104 is completely open, the low pressure oil passage 105 is completely closed.

Next, the operation of the above hydraulic control valve 100 will be explained. Conventionally, a hydraulic control valve used in a fuel injection timing control device operates two seat valves or spool valves using two solenoids to control hydraulic pressure on a high pressure side and a low pressure side. However, according to this method, the shape of the hydraulic control valve becomes large, the current consumption also increases, and variable throttling is not possible, so it is necessary to provide a restrictor in the middle of the hydraulic piping.

In this hydraulic control valve 100, for example, when it is necessary to increase the hydraulic pressure of the hydraulic control system, the pulse motor 101 rotates and high pressure oil is pumped from the high pressure side oil passage 104 through the hole 107 of the valve body 102 (5) and into the hollow portion lO. When it is necessary to lower the hydraulic pressure of the IF control system, the pulse motor 101 rotates and the hydraulic control system oil flows into the hydraulic control system oil path 106. From the passage 106, the hollow part 109 of 02 and the hole 108 are connected to the low pressure side oil passage 105.
flows to.

In the hydraulic control valve 100, the step motor 101
Since the rotation angle can be determined arbitrarily by the pulse signal, the holes 107, 1080) oil passages 104, 105
By setting the opening degree smaller than fully open,
11 ■ Configuring a variable aperture (can be done.

〔Effect of the invention〕

As mentioned above, the present invention provides a pulse signal! The valve body is rotated by a step motor driven by J ~, and the oil flow is changed to the hydraulic control system of the injection timing control device, so it is compact and has low current consumption, making it suitable for the injection timing control device. Accurate oil pressure control, which is important, can be performed, and variable aperture, which has been difficult to achieve in the past, can be easily achieved.

(6)

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of an injection timing control device including a hydraulic control valve of the present invention, and FIGS. 2(a) and 2(bl) are a side view and a front sectional view of the hydraulic control valve. I... Driven Side shaft, 5... Drive side disc, 12...
Hollow part, 13... Pipe, 14... High hydraulic pressure pipe, 15
... Tank, 17 ... Pump, 20 ... Low hydraulic pipe, 30 ... Control times 1/8.100 ... Hydraulic control valve,
101...Pulse motor, 102...Valve body, 103
...Body, 104...High+E+111 Oil passage, 10
5...Low pressure side oil path, 106...Hydraulic control system oil 11J
Iya representative patent attorney Takashi Okabe (7)

Claims (1)

[Claims] In a fuel injection timing control device for an internal combustion engine that uses hydraulic pressure as a driving source and controls fuel injection timing by adjusting this hydraulic pressure with a hydraulic control valve, the hydraulic control valve includes a pulse motor and a motor that is rotated by the pulse motor. A valve body that is moved and controls the flow of oil according to the rotation angle, and this valve body is rotatably inserted and is provided with a high pressure side oil passage, a low pressure side oil passage, and a hydraulic control system oil passage. A fuel injection timing control characterized in that the connection state of the high-pressure side oil passage and the low-pressure side oil passage to the hydraulic control system oil passage is controlled by rotating the valve body. Hydraulic control valve for equipment.