JPH0355797Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a control link device employed in an automatic driving device, etc. that automatically adjusts the amount of fuel injection to automatically drive a vehicle at a constant speed, etc. In particular, in a control linkage device in which a step motor drives and controls a rotary lever such as a governor's injection amount adjustment lever whose operation is restricted at the maximum rotation position, the rotation lever is operated to the maximum rotation position. The present invention relates to a control link device capable of controlling a step motor and preventing step-out of a step motor.

[Prior Art] Automated vehicle running systems are generally known as devices that automatically maintain a constant vehicle speed to reduce the burden on the driver and reduce the amount of fuel consumed by an internal combustion engine. (Utility Model Application Publication No. 53-165122, etc.).

By the way, there is a conventional automatic traveling device as shown in FIG. This automatic traveling device connects the injection amount adjustment lever b of the governor a of the injection pump to the link mechanism c.
It is operated by step motor d via
The step motor d is connected to a control unit f that outputs a control signal based on a detection signal from a vehicle speed sensor e, etc.
controlled by.

[Problems to be solved by the invention] However, in the link mechanism of the conventional automatic traveling device described above, the adjustment lever b is rotated from the idle position α to the full position β by the step motor d;
Adjustment lever b cannot be operated to the maximum rotational position (maximum injection amount position) γ regulated by stopper bolt g, and step motor d is driven at rotational position _{S1 ,} which is approximately 95% of the full stroke S0. I had to stop it. That is, when the adjustment lever b is operated to the maximum rotational position γ and brought into contact with the stop bolt g, the load acting on the step motor d becomes excessive and exceeds its step-out limit force F ₀ , and the adjustment lever b is returned to the idle position α all at once by the biasing force of the return spring h, making it impossible to adjust the injection amount thereafter.

Therefore, in an automatic driving system in which the fuel injection amount of the internal combustion engine is adjusted by a conventional control link device equipped with a step motor, there is a problem in that the output performance of the internal combustion engine cannot be guaranteed at 100%.

[Purpose of the invention] The present invention was devised in consideration of the above circumstances, and its purpose is to reduce the rotational lever, such as the injection amount adjustment lever of the governor, whose operation is regulated at its maximum rotational position, to its maximum rotational position. It is an object of the present invention to provide a control link device that can be operated up to a rotational position and that does not cause a step motor to step out.

[Summary of the invention] In order to achieve the above object, the present invention connects a step motor via a link mechanism to a rotational lever such as a governor injection amount adjustment lever whose operation is regulated at the maximum rotational position. The step motor is provided with an over-rotation range in which the rotary lever continues to rotate even after it is regulated to the maximum rotation position, and the link mechanism is provided with a spring member that absorbs the over-rotation range.

[Embodiment] A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a side view of the case where the control linkage device according to the present invention is adopted as a control linkage mechanism of an automatic traveling device that automatically runs a vehicle at a constant speed, etc., and FIG. A line arrow view is shown.

In the figure, 1 is a fuel injection pump, and 3 is an input shaft that serves as an input end of a governor section 2 that adjusts the amount of fuel injection.

As shown in the figure, an injection amount adjustment lever 4, which is a rotatable lever, is fixed to the input shaft 3 so as to be able to swing freely, and its maximum rotation position (maximum injection amount position) is set by a stopper bolt 5. regulated. The adjustment lever 4 is provided at one end 4a with a return spring 6 that biases it in the direction of decreasing the injection amount and returns the adjustment lever to the idle position, and at the other end 4a.
b is provided with an automatic control link 7 for actuating its adjusting lever 4.

The automatic control link 7 includes a link rod 8 connected to the other end 4b of the adjustment lever 4, and a swing end 9a connected to the other end 8a of the link rod 8, and a fulcrum portion 9.
b is composed of a driven lever member 9 which is rotatably provided on the drive shaft 11 of the step motor 10 via a bush 12, and a drive lever member 13 which is fixed to the drive shaft 11 and is rotated by the step motor 10. It is configured. The driven lever member 9 is always urged to be returned to the idle position by the return spring 6, and the drive lever member 13 is moved so as to overlap the driven lever member 9 in accordance with the idle position. It is provided.

The driven lever member 9 and the drive lever member 13 are each provided with engagement pieces 14 and 15 that extend outward in the radial direction of the drive shaft 11, and these engagement pieces 14 and 15 are engaged with each other. It is formed to be opened at a predetermined angle. A spring member 16 is provided at the distal ends of the engagement pieces 14 and 15 so as to span over them, and in the illustrated embodiment, a coil spring 16a is used. This coil spring 16a transmits the driving force of the drive lever member 13 rotated by the step motor 10 to the driven lever member 9 to rotate the adjustment lever 4.
The set force _F1 is set to be greater than the return force F2 due to the set force of the return spring 6 and the spring reaction force inside the governor ₂ .

On the other hand, the rotational operation area A of the step motor 10
is set above region B in which the adjustment lever 4 is operated from the idle position α to the maximum rotation position γ, and the over-rotation occurs even after the adjustment lever 4 contacts the stopper bolt 5 and its operation is restricted. A region C is provided, and the overspeed region C is configured to be absorbed by the axial extension of the coil spring 16a. That is, the set force F ₁ of the coil spring 16a is set to be less than the rotational torque T of the step motor 10, and F ₂ <F ₁ <T.

Next, the operation of this embodiment will be described.

When the step motor 10 is rotationally driven under the control of a control unit (not shown), the drive lever 1
3 rotates. The driving force of the drive lever 13 is transmitted to the driven lever 9 via the coil spring 16a, and the adjustment lever 4 is actuated. At this time, the coil spring 16a functions as a substantially rigid body.

When the adjustment lever 4 comes into contact with the stopper bolt 5 and operates to the maximum rotational position γ, the governor 2 enters the maximum injection amount state, and 100% output performance of the internal combustion engine is ensured. At this time, the step motor 10 is further rotated by the set overspeed range C even after the operation of the adjustment lever 4 is regulated, and the overspeed range C is elastic after the adjustment lever 4 contacts the stopper bolt 5. It is absorbed by the expansion of the coil spring 16a, which functions as a body. For this reason, the step motor 1
0 will not be affected by a load greater than its step-out limit force F ₀ ,
Step motor 10 is prevented from stepping out.

In addition, in the case of this embodiment, the overspeed range C
It may be configured to absorb this on the contraction side of the col spring 16a. In this embodiment, the control mechanism is set on the step motor side, but as in the example shown in Fig. 5, the step motor side is controlled by a lever directly connected to the shaft.
A control mechanism similar to 4) in the figure may be configured. Further, in the figure, 17 is a load sensor of the internal combustion engine provided on the adjustment lever 4, and this load sensor 1
The detection signal from 7 is input to the control unit of the automatic traveling device. Further, 18 provided on the side of the drive lever 13 is an engagement piece that is integrally bent and formed to engage with the driven lever 9. A play is set between the driven lever 9 and the coil. It serves as a compensation mechanism 19 that compensates for the operation of the automatic control link 7 when the spring 16a breaks.

[Modified Embodiment] FIG. 3 shows a modified example of the link mechanism of the step motor 10 of the above embodiment.
FIG. 4 is a view taken along the - line. In the figure, 8 is a link rod of the automatic control link 7, 9 is a driven lever, 13 is a drive lever, and 10 is a step motor.

As shown in the figure, in the case of this modification, a coil spring 16 used as a spring member
b is configured to absorb the overspeed range C of the step motor 10 by twisting around its axis. That is, the coil spring 16b is sandwiched between the drive lever 13 and the driven lever 9, and the coil spring 16b is
It is provided coaxially on the outer peripheral side of the drive shaft 11, and both ends thereof are engaged with the drive lever 13 and the driven lever 9, respectively. When the drive lever 13 is rotated, the coil spring 16b functions as a substantially rigid body and transmits the driving force of the drive lever 13 to the driven lever 9 to operate the adjustment lever 4, as in the previous embodiment. When the adjustment lever 4 comes into contact with the stopper bolt 5 and its operation is restricted to the maximum rotational position γ, the coil spring 16b functions as an elastic body, and the overspeed range C of the step motor 10 is controlled by the coil spring 1.
The torsion around the axis of 6b is absorbed, and the step motor 1
Prevents 0 step-out.

Further, in FIGS. 3 and 4, reference numeral 19 indicates an engagement pin 20 implanted in the drive lever 13 and a driven lever 9.
This is a compensation mechanism for the automatic control link 7 consisting of an engagement hole 21 formed in the .

[Effects of the invention] In summary, the present invention provides the following excellent effects.

(1) A step motor is connected via a link mechanism to a rotary lever whose operation is restricted at the maximum rotation position, and the step motor is also configured to allow further rotation even after the rotation lever is restricted to its maximum rotation position. Since the over-rotation range is set and the over-rotation range is absorbed by the spring member provided in the link mechanism, it is possible to prevent the step motor from stepping out while operating the rotary lever to the maximum rotation position.

(2) If the control linkage device of the present invention is adopted as an actuating device for the injection amount adjustment lever of the governor of an internal combustion engine, the output performance of the internal combustion engine can be ensured at 100%, and the vehicle can automatically run at a constant speed, etc. This will be extremely effective for automatic driving equipment.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a preferred embodiment of a control linkage device according to the present invention adopted as a control linkage mechanism of an automatic traveling system for a vehicle, and FIG. Figure 3 is a partial side view showing a modification of the link mechanism of the step motor section, and Figure 4 is a partial side view of the link mechanism of the step motor section.
5 is a schematic diagram of a conventional automatic traveling device. In the figure, 4 is an injection amount adjustment lever which is a rotating lever, 7 is a link mechanism, 10 is a step motor, 16, 16
a and 16b are spring members, γ is the maximum rotation position, and C is the over-rotation range.

Claims (1)

[Claims for Utility Model Registration] (1) A step motor is connected via a link mechanism to a rotary lever whose operation is regulated at its maximum rotation position, and the step motor is connected to a rotary lever whose operation is restricted to its maximum rotation position. A control link device characterized in that an over-rotation range is set in which the rotation is continued even after being regulated to a certain position, and the link mechanism is provided with a spring member that absorbs the over-rotation range. (2) The link mechanism is provided between a drive lever fixed to the drive shaft of the step motor, a driven lever rotatably supported by the drive shaft, and the driven lever and the drive lever. a spring member that transmits the driving force of the drive lever to the driven lever and absorbs the overspeed range of the step motor;
The control link device according to claim 1, which comprises a link rod connecting the swing end of the driven lever and the swing end of the rotary lever. (3) the spring member is provided so as to span between one end of the drive lever and one end of the driven lever;
The control according to claim 2 of the utility model registration claim, which comprises a coil spring that absorbs the over-rotation range of the step motor by expansion or contraction in the axial direction when the rotation lever is regulated to the maximum rotation position. link device. (4) The spring member is provided coaxially with the drive shaft of the step motor by being sandwiched between and engaged with the drive lever and the driven lever, and the rotation lever is at the maximum rotation position. The control linkage device according to claim 2 of the utility model registration, which comprises a coil spring that absorbs the overspeed range of the step motor by twisting around the axis when the step motor is restricted.