JPH08270462A - Engine speed control device - Google Patents

Abstract

PURPOSE: To prevent a cable from interfering with other parts at the time of controlling maximum engine speed by making a floating arm fixable/ releasable by an actuator together with a stopper in an engine speed control device connected to the load lever of a limit speed governor. CONSTITUTION: In the normal travel state of a tractor, an actuator 21 interlocked with an air suspension holds the tip 18b of a floating arm 18 between an elongated driving rod 21a and a stopper 22. At this time, when a relay lever 13 is rotated through a first cable 12 interlocked with an accelerator pedal, a load lever 17a is rotated through a second cable 14. When air pressure in the air suspension is lowered to lower the vehicle height, on the other hand, the driving rod 21a is put in contracting motion to make the arm 18 rotatable, and the pivot point 13c of the relay lever 13 is shifted by the rotation of the arm 18 so as to suppress the increase of engine speed caused by the depression of the accelerator pedal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle engine speed control device. More specifically, it relates to an engine speed control device connected to a load lever of a limit speed governor.

[0002]

2. Description of the Related Art A fuel injection pump of a diesel engine is provided with a governor for controlling a fuel injection amount. For this type of governor, a maximum speed and a limit speed governor that controls the vicinity of a low speed called idling,
An all-speed governor is known that controls all the rotation speeds so that the rotation speed of the engine does not suddenly change due to changes in load. The limit speed governor is equipped with a load lever and a speed lever. The load lever is connected to a first cable or rod that works in conjunction with the accelerator pedal, and this lever can adjust the injection amount according to the amount of depression of the accelerator pedal to bring the engine rotation speed to a desired rotation speed. It is like this.

Conventionally, a limit speed governor is used in a large vehicle such as a tractor equipped with an air suspension, and an engine speed control device is connected between a load lever and a first cable or a rod which is interlocked with an accelerator pedal. To be done. As shown in FIG. 6 (a), the conventional engine speed control device 1 has an accelerator pedal at one end of a relay lever 3 formed in a substantially inverted L shape whose center is pivotally supported at the tip of the drive rod 2 a of the actuator 2. The interlocking first cable 4 is connected, and the other end is connected to the load lever 6 via the rod 7. In a normal traveling state, the drive rod 2a is contracted, and the movement of the first cable 4 is directly connected to the rotation of the load lever 6. That is, when the first cable 4 is in the idle position, the load lever 6 is also in the idle position, and when the first cable 4 is in the full position, the load lever 6 is also in the full position. But,
As shown by the solid line in FIG. 6B, when the drive rod 2a of the actuator 2 is protruded by a predetermined amount L, the pivot point of the relay lever 3 is displaced in substantially the same direction as the moving direction of the first cable 4. , Even if the first cable 4 which is linked to the accelerator pedal moves as shown by the chain double-dashed line in the figure,
When the amount of movement of the cable is less than the amount L of protrusion of the drive rod 2a, the return spring 8 that returns the load lever 6 to the idle position does not rotate the load lever, but the amount of movement of the first cable that exceeds the amount of protrusion of the relay lever Are rotated as shown by the alternate long and short dash line in the figure.

Further, the actuator 2 in the above vehicle
Is linked with an air suspension (not shown). For example, when the vehicle is a tractor and the vehicle height is lowered by lowering the air pressure in the air suspension when the tractor connects the trailer, the actuator 2 causes the rod 2a to project when the air pressure in the air suspension decreases. It is like this. As a result, in the conventional engine speed control device 1, even if the accelerator pedal is accidentally depressed when the vehicle height is lowered to connect or disconnect the trailer, the engine rotation speed does not increase and an unexpected accident is prevented. You can do it.

[0005]

However, in the conventional engine speed control system 1 shown in FIG. 6, since the pivot point of the relay lever 3 is provided at the tip of the drive rod 2a of the actuator 2, when the accelerator pedal is released. When the drive rod 2a is made to protrude, the first cable 4 inevitably becomes loose as shown in FIG. 6 (b) by the protruding amount of the drive rod 2a, and this looseness is caused by the loosened first cable and other parts. There was a risk of inviting interference. An object of the present invention is to control the maximum rotation speed of an engine by a limit speed governor, and an engine speed control device in which a cable interlocking with an accelerator pedal does not interfere with other parts when the accelerator pedal is released. To provide.

[0006]

A configuration of the present invention for achieving the above object will be described with reference to FIG. 1 corresponding to an embodiment. The present invention relates to the first arm 13a and this arm 13a.
The second arm 13b forming a predetermined angle with
a relay lever 13 integrally formed with the base ends of a and 13b in common and having the base end as a pivot point 13c; and a first lever connected to the tip of the first arm 13a in conjunction with the accelerator pedal 11.
The cable 12, the second cable 14 having one end connected to the tip of the second arm 13b and the other end connected to the load lever 17a of the fuel injection pump 16, and the pivot point 13c of the relay lever 13 are moved to move the first cable 12. Improvement of an engine speed control device including an actuator 21 having a drive rod 21a for displacing a predetermined amount in substantially the same direction as the direction and a return spring 19 for returning the load lever 17a to an idle position when the second cable 14 is not operated. Is. Its characteristic structure is that the base end 18a is pivotally attached and the tip end 18b is provided with a pivot fulcrum 13c of the relay lever 13, and the tip end 1 of the floating arm 18 driven when the actuator 21 is actuated.
8b and a stopper 22 for fixing together with the drive rod 21a, the tip 18b of the floating arm 18 contacts the drive rod 21a when the first cable 12 is in the operating state and the actuator 21 is in the non-operating state, When the first cable 12 and the actuator 21 are both in the non-actuated state, the first cable 12 and the actuator 21 are configured to contact the stopper 22 with a force smaller than the restoring elastic force of the return spring 19.

[0007]

As shown in FIG. 2, when the actuator 21 is actuated, the drive rod 21a protrudes to clamp the tip 18b together with the stopper 22 to inhibit the floating arm 18 from rotating. When the accelerator pedal 11 is depressed in this state, the first cable 1
2 moves, and the relay lever 13 rotates. The second cable 14 rotates the speed lever 17a according to the rotation amount of the relay lever 13. As shown in FIG. 1, the floating arm 18 is allowed to rotate when the actuator 21 is not operating. The tip of the floating arm 18 contacts the drive rod 21a when the first cable 12 is in the operating state, and contacts the stopper 22 with a force smaller than the restoring elastic force of the return spring 19 when the first cable 12 is in the non-operating state. Contact. Floating arm 18
The pivot point 13c of the relay lever 13 is displaced during rotation of the relay lever 13, the first cable 12 is not loosened while the pivot point 13c is displaced, and the second cable is moved even if the first cable 12 moves. 14 does not move. Floating arm 1
When the first cable 13 further moves after the tip of 8 contacts the drive rod 21a, the second cable 14 interlocks with this.

[0008]

An embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 3, the vehicle is a tractor in this example. One end of a first cable 12 is connected to an accelerator pedal 11 of this tractor via a link mechanism 11a, and the other end of the first cable 12 is a first lever of a relay lever 13.
It is connected to the tip of the arm 13a. As shown in FIGS. 1 and 2, in the relay lever 13, the first arm 13a and the first arm 13a are integrally formed with the second arm 13b forming an angle of substantially right angle in this embodiment, with the base ends of both arms being common. Is formed in a rectangular shape, and its proximal end constitutes a pivot point 13c. The other end of the first cable 12 is connected to the tip of the first arm 13a through a support tool 12a fixed to the vehicle body. One end of the second cable 14 is connected to the tip of the second arm, and the other end of the second cable 14 is connected to the load lever 17a attached to the limit speed governor 17 of the fuel injection pump 16. As a result, as shown in FIG.
When is depressed as indicated by a solid arrow, the load lever 17a can be rotated via the relay lever 13. The load lever 17a has this lever shown in FIG.
A return spring 19 for restoring the idle rotation position shown by the chain line B is provided. The return spring 19 allows the load lever 17a to return to the idle position when the second cable 14 is not operated.

As shown in FIGS. 1 and 2, the relay lever 13 has a base end 18a pivotally attached to a vehicle body (not shown), and a distal end 18b of the floating arm 18 whose pivot support point 13c is pivotally attached. The rotation is stopped or allowed by the actuator 21. The actuator 21 has a drive rod 21a that drives in a direction substantially the same as the moving direction of the first cable 12, and the drive rod 21a is projected when the actuator is operated so that the tip end 18b of the floating arm 18 is provided on a stopper 22 provided on a vehicle body (not shown). The floating arm 18 is fixed by abutting the tip of the floating arm 18 together with the stopper 22 by the drive rod 21a. A spring 18c is attached to the floating arm 18. The spring 18c is configured to bring the tip end 18b of the floating arm 18 into contact with the stopper 22 with a force smaller than the restoring elastic force of the return spring 19 when both the first cable 12 and the actuator 21 are in the inoperative state.

The actuator 21 is interlocked with an air suspension (not shown), and when the tractor connects the trailer, the air suspension lowers the air pressure in the air suspension to lower the vehicle height.
As shown in FIGS. 4 and 5, the actuator 21 has a cylindrical main body 21b whose interior is partitioned by a piston head 21c, and a spring 21d is provided on the drive rod 21a side. An air port 21e for supplying / exhausting air is provided at an end edge of the main body 21b on the piston head side, and the air is supplied / exhausted in conjunction with the air pressure in the air suspension. When the air pressure in the air suspension is low, such as when the starter switch is off or when the tractor connects the trailer, the actuator 21 becomes inactive, and the main body 21 as shown in FIG.
The air in b is discharged from the air port 21e and the spring 21
d presses the piston head 21c, drives rod 21a
Is shrinking. When the tractor is in a traveling state, air is filled in the air suspension, and as shown in FIG. 5, air is filled in the main body 21b through the air port 21e, and the actuator 21 is in an operating state. The filled air presses the piston head 21c and drives the drive rod 21a.
Is designed to extend. That is, the actuator 21
When the air pressure in the air suspension decreases, the drive rod 21a contracts as shown in FIG.

The operation of the engine speed control device thus configured will be described. When the tractor is in a normal traveling state, the air is filled in the air suspension, and the actuator 21 that operates in conjunction with the air suspension is
The drive rod 21a is extended as shown in FIG.
Sandwich. Since the tip end 18b of the floating arm 18 is clamped, the relay lever 13 rotates as shown by the chain double-dashed line in FIG. That is, the first cable 12 moves according to the amount of depression of the accelerator pedal 11, and the relay lever 13 rotates to cause the second cable 14 to move the load lever 17 a according to the amount of rotation of the relay lever 13 by a chain double-dashed line. It will rotate as shown.

When the tractor lowers the vehicle height by lowering the air pressure in the air suspension for connecting or disconnecting the container, the actuator 21 interlocking with the air suspension contracts the drive rod 21a to cause the floating arm 18 to move. Becomes rotatable. That is,
The floating arm 18 has a drive rod 21a with a tip 18b from a position where the tip 18b abuts the stopper 22, as shown by a chain double-dashed line in FIG.
It rotates within the range of contact with. Floating arm 1
The rotation of 8 displaces the pivot 13c of the relay lever 13,
As a result, the rotation of the floating arm 18 is interlocked with the movement of the first cable 12. While the pivot position is displaced, the first cable does not loosen, and the first cable 1
Even if 2 moves, the second cable 14 does not move. When the first cable 12 further moves after the tip of the floating arm 18 contacts the drive rod 21a, the relay lever 1
3 rotates as shown by the chain double-dashed line, and the second cable 14 is interlocked with this.

It should be noted that the actuator in the above embodiment may be capable of adjusting the protrusion amount of the drive rod. In this case, the amount of movement of the first cable when the actuator is not operating can be adjusted by changing the position where the tip of the floating arm contacts. Further, in the above embodiment, the first cable and the second cable are used for description, but a rod may be used to connect the accelerator pedal and the load lever to the relay lever. Also,
Although a tractor is used as the vehicle in the above embodiment, a diesel engine equipped with a limit speed governor and a vehicle provided with an actuator may be, for example, a truck. Although the actuator is interlocked with the air suspension in the above embodiment, the actuator may be controlled by a manual switch. Further, in the above-mentioned embodiment, the tip of the floating arm is urged by the spring so as to contact the stopper. However, the drive rod of the actuator is positioned so that the protruding direction is perpendicular to the vehicle, and the actuator is driven by the weight of the floating arm and the relay lever. The tip of the floating arm may be brought into contact with the stopper when not operating.

[0014]

As described above, according to the present invention, the floating arm, the stopper with which the tip of the floating arm abuts, and the actuator are provided, and the actuator fixes or releases the floating arm together with the stopper. In addition, since the floating arm is configured to contact the stopper with a force smaller than the restoring elastic force of the return spring when the first cable is in the non-operating state, when the actuator allows the floating arm to rotate, the relay lever pivots. When the support position is displaced and the first cable is moved by pressing the accelerator pedal by a predetermined amount, the second cable does not move and the first cable does not loosen. As a result, when the accelerator pedal is depressed by a predetermined amount, the rotation speed of the engine does not increase, and the first cable and other parts do not interfere with each other.
Further, if the actuator is such that the amount of protrusion of the drive rod can be adjusted, the maximum rotation speed when the actuator is not operating can be adjusted.

[Brief description of drawings]

FIG. 1 is a diagram showing a state in which a floating arm of an engine speed control control device according to an embodiment of the present invention rotates.

FIG. 2 is a view corresponding to FIG. 1 showing a state in which the rotation of a floating arm is stopped by a drive rod.

FIG. 3 is a diagram showing a relationship among an accelerator pedal, a relay lever, and a load lever.

FIG. 4 is a cross-sectional view showing a non-actuated state of the actuator.

FIG. 5 is a sectional view showing an operating state of the actuator.

FIG. 6 is a diagram corresponding to FIG. 1 showing a conventional example.

[Explanation of symbols]

 11 Accelerator Pedal 12 First Cable 13 Relay Lever 14 Second Cable 16 Fuel Injection Pump 17a Load Lever 18 Floating Arm 18a Base End 18b Tip 19 Return Spring 21 Actuator 21a Drive Rod 22 Stopper

Claims (1)

[Claims] 1. A first arm (13a) and the first arm (13a)
The second arm (13b) forming a predetermined angle with both arms (13a, 13a
The relay lever (13) integrally formed integrally with the base end of b) and having the base end as a pivot point (13c), and an accelerator pedal (11).
The first arm connected to the tip of the first arm (13a)
The cable (12) or rod and one end of the second arm (13
The second cable (14) or rod connected to the tip of b) and the other end to the load lever (17a) of the fuel injection pump (16) and the pivot point (13c) of the relay lever (13) An actuator (21) having a drive rod (21a) for displacing the first cable (12) or the rod in a substantially same direction as the moving direction of the rod, and the load lever when the second cable (14) or the rod is not operated. In an engine speed control device provided with a return spring (19) for returning (17a) to an idle position, a base end (18a) is pivotally attached and a tip end (18b) is pivotally supported (13c) of the relay lever (13). Floating arm equipped with (18)
And a stopper (22) for stopping the tip (18b) of the floating arm (18) driven when the actuator (21) is actuated and fixing the floating arm (18) together with the drive rod (21a). ) Is the drive rod when its tip (18b) is in the operating state of the first cable (12) or rod and in the inactive state of the actuator (21).
When the first cable (12) or rod and the actuator (21) are in a non-operating state, the stopper (22) is applied to the stopper (22) with a force smaller than the restoring elastic force of the return spring (19). An engine speed control device, which is configured to abut.