JPS5815656Y2 - fuel metering device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel metering device for use in fuel injection engines.

Conventionally, this type of device includes an operating shaft of a control valve for measuring fuel that is inserted in a fuel passage leading to a fuel injection nozzle of an engine, and a flap plate for detecting the amount of incoming air that is inserted in an air inflow path of the engine. There are known types in which the control valve is connected to the operating shaft so that it rotates as the flap plate rotates, but in this case, the rotation of one side is directly transmitted to the other side. In such a device, when the amount of air flowing in increases, the amount of fuel to be metered does not properly follow the increase, resulting in the disadvantage that the concentration of the air-fuel mixture changes.

To explain this in detail, the characteristics of the ratio of increase in the rotation angle of the fuel metering control valve to the increase in rotation angle of the flap plate are shown in Figure 1. Characteristic 4 of
Each is indicated by I:la.

Since the line indicates that both rotation angles are in a proportional relationship, a constant proportion of fuel is always measured from the low inflow air amount area to the high inflow air amount area.

However, the irregularity of the idle link due to the occurrence of fluttering of the flap plate in the low inflow air amount region and the resulting machining ξ
In order to prevent deterioration of the air flow rate, the ratio of increase in the rotation angle of the fuel metering control valve to the increase in the rotation angle of the flap plate should be reduced. It is necessary to reduce the rate of increase in

That is, the characteristic of line a must be achieved.

The purpose of the present invention is to obtain a rotating device for a flap plate and a fuel metering control valve having the above-mentioned rotational characteristics. A valve 2 is provided and an air inflow path 3 of the engine is provided.
A flap plate 4 for detecting air inflow is provided on the control valve 2.
The operating shaft 5 of the flap plate 4 and the operating shaft 6 of the flap plate 4 are connected by an interlocking mechanism 7.
The interlocking mechanism 7 is composed of an arm piece 8 extending from the operating shaft 5 and an arm piece 9 extending from the operating shaft 6, and both arm pieces 8, 9 are engaged with each other by the bottle 10 on one side and the bottle hole 11 in the longitudinal direction on the other side.

Figures 2 and 3 show an example of this type, in which a bottle 10 is provided in the operating arm 9 on the flap plate 4 side, and a bottle hole 11 is provided in the operating arm 8 on the control valve 2 side. In this case, when the flap plate 4 is in the fully closed position, the operating arms 8 and 9 are in a substantially perpendicular position, and therefore, in this state, the pin 10 moves within the bottle hole 11 when the flap plate 4 rotates toward the opening side. Therefore, a relatively small rotation is applied to the control valve 2 side.

In the drawing, 12 is a spring that presses the pin 10 in one direction to prevent it from rattling, 13 is a worm gear mechanism for idle adjustment interposed between the operating shaft 5 and the arm piece 8, and 1
4 indicates a throttle valve on the downstream side of the flap plate 4.

The control valve 2 is of a type that rotates within a valve housing 15 on the outer periphery, and the valve hole 16 opens according to the rotation angle.

To explain its operation, as the amount of air inflow increases, the flap plate 4 gradually rotates toward the opening side, and the control valve 2 is given a corresponding rotation via the interlocking mechanism 7.
Although this point is not particularly different from the conventional one, in this case, the interlocking mechanism 1 is initially small at the output side by the engagement between the pin 10 and the bottle hole 11 as described above, and then gradually thickens. ,
Thus, the rotation of the flap plate 4 and the rotation of the control valve 2 have the relationship shown, for example, by line a in FIG. 1, which means that the amount of air inflow and the amount of fuel to be metered are in a different proportional relationship.

In this way, according to the present invention, the operating characteristics of the fuel metering control valve 2 are corrected by the interlocking mechanism 1 to change the opening degree of the throttle valve 2 corresponding to the increase in the amount of air flowing into the throttle valve 2. However, it has the advantage of eliminating the above-mentioned disadvantages in systems consisting of, for example, gear trains or the like.

[Brief explanation of the drawing]

FIG. 1 is a diagram of the operating characteristics of the flap plate, FIG. 2 is a cutaway side view of an example of the proposed device, and FIG. 3 is a cutaway plan view of the main parts thereof. 1...Fuel passage, 2...Control valve, 3.
... Air inflow path, 4 ... Flap plate, 5
, 6... Operating axis, 7... Interlocking mechanism, 8
, 9... arm piece, 10... pin, 11...
...Bottle hole.

Claims (1)

[Scope of utility model registration request] A control valve 2 for measuring fuel is provided in the fuel passage 1 leading to the fuel injection nozzle of the engine, and a flap plate 4 for detecting the amount of air inflow is provided in the air inflow path 3 of the engine, and the control valve 2 is operated. The shaft 5 and the flap plate 40 operating shaft 6 are connected to each other via the interlocking mechanism 7, and the interlocking mechanism T is connected to the arm piece 8 extending from the operating shaft 5 and the operating shaft 6. A fuel metering device consisting of an extending arm piece 9 and in which both arm pieces 8 and 9 are engaged with each other through a bottle 10 on one side and a bottle hole 11 in the length direction on the other side.