JPS5836833Y2 - Fuel injection pump for internal combustion engines - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fuel injection pump for an internal combustion engine.

In contrast to conventional injection pumps, in order to improve starting performance in cold weather and achieve smooth idling, a thermo-element that operates according to the cooling water temperature is used to advance the starting angle and start the engine through appropriate links. This controls the injection amount and idle speed.

However, in the conventional configuration, if an attempt was made to increase the idle rotation speed even when the compressor of an air conditioner is operating, a completely different link mechanism must be provided.

Therefore, in the present invention, one lever involved in controlling the idle speed is controlled independently by two actuators.
It is an object of the present invention to provide a fuel injection pump that can be driven and eliminates the above-mentioned drawbacks.

The present invention will now be described with reference to an implementation ψ11 shown in the drawings.

Inside the cooling water temperature detection device 2, which is installed adjacent to the pump body 1 as shown in FIG. There is a first actuator 6 consisting of an actuating thermoelement.

The spring 7 applies a force to the spring seat 8 and the shaft 9 fitted thereto in a direction to press the piston 6a of the actuator 6.

The stopper 10 is a fastening member for the actuator 6 and also serves as a stopper for determining the final position of the spring seat 8.

The shaft 9 is a first lever 12 that rotates around an axis 11.
It is locked to.

The second lever 13 is rotatable about a shaft 14 and is connected to the first lever 12 via a rod 15.

The third lever 16 is rotatable around a shaft 17, and its one end 16a (not shown) is opposed to an adjusting lever 18 that is linked to the accelerator pedal of the vehicle and defines the idle side position of the adjusting lever 18. and the other end 16
b is a pin 12 forming an engaging member provided on the first lever 12;
Facing a.

The second actuator 19, which is a diaphragm type, responds to signals other than the cooling water temperature, for example, by turning the air conditioner switch ON and OFF, and in other words, turning the air conditioner compressor ON and OFF.
The shaft 20 is slidably inserted into the protruding piece 16c of the third lever 16, and a stopper 21 whose position can be adjusted is attached.

2T is the pump camshaft that rotates in synchronization with the engine.

As shown in FIG. 2, inside the main body 1, a roller ring 23 is rotatably installed to determine the fuel injection timing using a well-known method. is touching (・ru.

This lever 25 is interlocked with the first lever 12 (FIG. 1) via the shaft 11.

In FIG. 3, a plunger 26 for distributing and pumping fuel is shown.
is movable in the axial direction with respect to the pump camshaft 27 (Fig. 1), is rotatably coupled to the pump camshaft 2γ, and slides oil-tightly against the cylinder and control sleeve 28 (not shown). Possibly inserted.

The Fufi weight 29 is connected to the pump camshaft 2 via the gear 30.
It is installed in a holder 31 that is driven at γ, generates centrifugal force according to the number of rotations, and applies the full thrust to the governor sleeve 32.

The start lever 33 and the tension lever 34 are both rotatably supported by a pin 35, and a joint 36 provided at one end of the start lever 33 is slidably fitted into a hole in the control sleeve 28.

One end of the start spring 3γ is fixed to the start lever 33, and the other end contacts the tension lever 34.

The seat 38 is slidable relative to the tension lever 34 and is engaged with a main spring 39, and a damper spring 40 is installed between the seat 38 and the tension lever 34.

The idle spring 41 is installed between the start lever 33 and the tension lever 340.

The lever 42 has one end that functions as a stopper that defines the position of the start lever 33 and is connected to the second lever 42 via the shaft 14.
The lever 13 (FIG. 1) is connected to the lever 13 (FIG. 1).

Furthermore, 43 is a stopper that defines the amount of rotation of the tension lever 340 in the counterclockwise direction.

Next, the operation will be explained.

When the temperature of the cooling water is low, the lift amount of the piston 6a of the first actuator 6 is at a minimum as shown in FIG.

This movement causes the lever 25 to rotate clockwise via the shaft 9, the first lever 12, and the shaft 11, and the lever 25
5 comes into contact with the edge of the notch 24 and rotates the roller ring 23 in the advancing direction.

Further, as the first lever 120 rotates clockwise, the lever 42 rotates clockwise via the rod 15, the second lever 13, and the shaft 14, and this causes the start lever 3 to rotate clockwise.
3, push the pin 35 up and down until it hits the governor sleeve 32.
The control sleeve 28 is rotated counterclockwise to move the control sleeve 28 to the right, that is, in the direction of increasing the injection amount.

Further, the clockwise rotation of the first lever 12 causes the third lever 16 to rotate counterclockwise via the pin 12a, pushing the adjusting lever 18 to the left.

As a result, the tension lever 34 rotates counterclockwise around the pin 35 via the main spring 39, the spring seat 38, and the damper spring 40, which are connected to the adjusting lever 18 by a method not shown. Accordingly, the start lever 33 is rotated counterclockwise via the idle spring 41 to increase the injection amount and the idle rotation speed.

Conversely, when the cooling water temperature is high, the piston 6a of the first actuator 6 protrudes to the left against the spring 7, thereby rotating the first to third levers 12°13.16 in the opposite direction. make it move.

In other words, when the cooling water temperature is low, sometimes the injection timing at startup is advanced, the injection amount at startup is increased, and the rotation speed at idle is increased, and when the cooling water temperature is high, the injection timing at startup is delayed, and the Reduces the injection amount at the time and lowers the idle speed.

On the other hand, the shaft 20 of the second actuator 19 is pulled upward and to the right when the air conditioner is turned on.

Accordingly, the stone ζ21 comes into contact with the protruding piece 16c and rotates the third lever 16 in the counterclockwise direction, increasing the idle rotation speed in the same manner as described above.

At this time, the first. It has no effect at all on the second lever 12.13 (・.

In the above example #2, the second actuator 19 and the third lever 16 are connected to the shaft 20, the stopper 21 and the protruding piece 16.
c, the third lever 16 is connected to the first
However, even if the second actuator 19 and the third lever 16 are connected by a wire cable, the bending of the wire cable is utilized to rotate the second actuator 19 in the direction of increasing the idle speed. The third lever 16 can be rotated by the first actuator 6 in the direction of idle rotation.

Similarly, a wire can be used to connect the first actuator 6 and the first lever 12.

In addition, the shape and arrangement of the second and third levers 13 and 160 are changed, and an engaging member such as a bottle is provided on one of the levers.
The third lever 16 may be rotated via the button and its engagement member.

Furthermore, in the above-mentioned practical example 1IfA, the first actuator 6 performs three controls: idle rotation control, special starting advance angle, and starting injection amount control, but depending on the case, the function of starting advance angle or starting injection amount control may be You don't have to.

As is clear from the above description, according to the present invention, one lever for controlling the idle speed can be independently rotated by two actuators, so that the lever for controlling the idle speed can be rotated independently, unlike the conventional lever for controlling the idle speed. It is no longer necessary to provide two pumps, and the fuel injection pump can be simplified, made smaller and lighter, and other excellent effects can be obtained.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of the present invention.
The figure is a partial cross-sectional external view, and Figures 2 and 3 are schematic configuration diagrams of the main parts inside the pump. 6... One actuator, 12... Lever for fuel injection timing control, 12a... Pin forming an engaging member, 1
3... Lever for controlling the amount of fuel at startup, 16... Lever for controlling the idle speed 19... Other actuator.

Claims (2)

[Scope of utility model registration request] (1) One lever that controls the fuel injection timing or fuel injection amount at startup, and one actuator connected to this one lever, which can be engaged with the one lever described in U and controls the idle rotation speed. the other lever, and the other actuator that drives the other lever only in the direction of increasing Altor rotational speed, and the one actuator moves the one lever by 1 in the direction of advancing the fuel injection timing or in the direction of increasing the amount of fuel at startup. A fuel injection pump for an internal combustion engine, characterized in that when driven, both the levers are engaged and the other lever is driven one step in a direction to increase the idle rotation speed. (2) One actuator operates according to the temperature of the hot body to be tested, which has a correlation with the temperature of the internal combustion engine, and the other actuator operates according to the operating state of the compressor of the air conditioner. A fuel injection pump for an internal combustion engine according to claim 1, which is a utility model.