JPS6113100B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanical governor in which the full Q (maximum fuel injection amount) characteristic of a fuel injection pump can be arbitrarily set to facilitate starting and increasing the amount of fuel.

Conventionally, in order to diversify the full-load governor characteristics of a mechanical governor, an Angleich spring, a torque spring, a boost compensator, a torque cam, etc. have been incorporated into the governor, but among these, the torque cam has the highest degree of freedom in setting. However, as seen in, for example, Japanese Utility Model Application Publication No. 51-139818, it had the disadvantage that it could only be attached to limited types of governors.

The present invention has been made in view of the above, and includes:
By making it possible to incorporate a torque cam with a high degree of freedom in setting the full Q characteristic into any type of mechanical governor, the torque cam can be electronically controlled in response to the engine speed without sacrificing the characteristics of a mechanical governor. The purpose is to control the governor characteristics at full load using a torque cam.

The present invention will now be described with reference to illustrated embodiments.

1 to 3 show the application of the present invention to high-speed and low-speed governors, in which a governor shifter 2 receives thrust from a flyweight 1 driven by an engine, and a tension lever 4 receives tension from a governor spring 3. are brought into contact with each other via the idle spring 5. One end of a guide lever 7 is pivotally connected to the support shaft 6 of the tension lever 4, and the other end of the guide lever 7 is pivotally connected to the governor shifter 2.
A control lever 9 is pivotally connected to the base end of a floating lever 8 whose intermediate portion is pivotally connected to the intermediate portion of the floating lever 8 . 10 is a start spring.

Further, an elastic member 14 is provided in the middle of the rod 13 connecting the tip of the floating lever 8 and the control rack 12 of the fuel injection pump 11, which can be elastically deformed when the floating lever 8 moves toward the increase side. A cancel device 15 is interposed therebetween, and a stopper 16 is fixed to the control rack 12 side by this cancel device 15.

On the other hand, an actuator 19 is connected to a rotation sensor 17 for detecting the rotational speed of the engine via a control unit 18, the stopper 16,
That is, in order to restrict the movement of the control rack 12 toward the increase side, a cancel device 23 having an elastic member 22 is also provided in the middle of the rod 21 that connects the stopper 16 with the torque cam 20 that abuts and locks it. The actuator 19 is adapted to rotate the torque cam 20 by an angle proportional to the rotational speed of the engine, and the elastic member 22 of the cancel device 23 is adapted to rotate the torque cam 20 in a direction that increases the rotation angle of the torque cam 20. It is designed so that it can be elastically deformed when moving 21.

In the above configuration, the control characteristics of the mechanical governor itself are set as shown by the solid line in FIG. 3, and the characteristics when the stopper 16 is in sliding contact with the torque cam 20 are set as shown by the broken line in the same figure. Assume.

Now, when the control lever 9 connected to the accelerator pedal is held at the full load position and the engine is started, the torque cam 20 is not rotated before the start, as shown in FIG. Since no thrust is generated by the weight 1, the stopper 16 is thrust into the notch of the torque cam 20 and is locked. When the engine is started in this state, the control rack 12 is held at a position from point a to point g in FIG. When the rotational speed of the engine gradually increases and reaches a value N corresponding to point g, the actuator 19 tries to rotate the torque cam 20, but the resistance due to engagement with the stopper 16 causes the cancel device 23 to rotate.
Since the holding force is larger than the holding force by the elastic member 22, the cancel device 23 operates and the torque cam 20 does not rotate. Therefore, the control rack 12 is
As the engine rotational speed increases, it is controlled by a single mechanical governor and changes to a on the diagram.
→Move to b→c→d→e.

Furthermore, when the position of the control lever 9 is changed during steady operation and the rack 12 moves to a position below the broken line A, the stopper 16 separates from the torque cam 20. Device 23 is released. Therefore, the torque cam 20 rotates to a normal position commensurate with the rotational speed of the engine.

When the control lever 9 is moved to the full load position again in this state, the stopper 16 comes into contact with the torque cam 20, as shown in FIG. 2, so that the amount of protrusion (maximum injection amount) of the control rack 12 is regulated. At this time, the cancel device 15 interposed in the rod 13 connecting the floating lever 8 and the control rack 12 is activated. In addition, in order for the torque cam 20 to control all the full-load governor characteristics (full Q) during steady operation after the torque cam 20 is activated, the position of the hook portion (cutout portion) of the torque cam 20 must be set below the idle rotation speed position. Of course, it is necessary to set it to .

In the above embodiment, the present invention is applied to high speed and low speed governors, but as shown in FIG. 4, it can also be applied to an all speed governor.
It goes without saying that in this all-speed governor, the governor spring 3 and the control lever 9 are connected via the governor spring 3. Also in this case, by setting the notch of the torque cam 20 below the idle rotation speed, it is possible to obtain full load characteristics according to the control diagram of the torque cam 20 as shown by the broken line in FIG. 5 during steady operation. can.

As explained above, according to the present invention, full Q
Since full load control of the mechanical governor can be performed using a torque cam that has a high degree of freedom in setting characteristics, it is possible to easily secure an increase in starting power, etc.
Furthermore, it is not necessary to use the Angleich spring, torque spring, boost compensator, etc. that were used to improve the full Q characteristic, and the full Q characteristic can be set arbitrarily without impairing the characteristics of the mechanical governor.

[Brief explanation of the drawing]

Fig. 1 is a mechanical diagram showing one embodiment of the present invention;
The figure is a mechanical diagram of the main part showing its operating state, Figure 3 is a control characteristic diagram of the same governor, Figure 4 is a mechanism diagram showing another embodiment of the present invention, and Figure 5 is a control characteristic diagram of the same governor. . 8...Floating lever, 11...Fuel injection pump, 12...Control rack, 13...
... Rod, 14 ... Elastic member, 15 ... Cancel device, 16 ... Stopper, 17 ... Rotation sensor, 18 ... Control unit, 19 ... Actuator, 20 ... Torque cam, 21 ... Rod, 22 ... Elastic member, 23...Cancel device.

Claims (1)

[Claims] 1. In a fuel injection pump equipped with a mechanical governor, an elastic member is interposed in the middle of the rod that connects the floating lever of the governor and the control rack of the fuel injection pump, and the rod is operated in response to the rotational speed of the engine. 1. A governor for a fuel injection pump, characterized in that an actuator and a torque cam that restricts movement of a stopper that moves integrally with the control rack in the fuel increasing direction are coupled via an elastic member.