JP3312676B2 - Engine speed control device - Google Patents

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, the present invention 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 governor for controlling a fuel injection amount is provided in a fuel injection pump of a diesel engine. This type of governor has a maximum speed governor and a limit speed governor that controls the vicinity of a low rotational speed called idling,
There is known an all-speed governor that controls all rotation speeds so that the rotation speed of the engine does not suddenly change due to a change in load. The limit speed governor is provided with a load lever and a speed lever. A first cable or rod that is linked to an accelerator pedal is connected to the load lever, and this lever adjusts the injection amount according to the amount of depression of the accelerator pedal, so that the rotation speed of the engine can be set to a desired rotation speed. It has become.

Conventionally, large vehicles equipped with air suspensions, such as tractors, use a limit speed governor, and an engine speed control device is connected between a load lever and a first cable or rod linked to an accelerator pedal. Is done. As shown in FIG. 6 (a), a conventional engine speed control device 1 is provided with 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 a drive rod 2a of an actuator 2. The linked first cable 4 is connected, and the other end is connected to the load lever 6 via the rod 7. In a normal running state, the drive rod 2a contracts, and the movement of the first cable 4 directly leads to the rotation of the load lever 6. That is, when the first cable 4 is at the idle position, the load lever 6 is also at the idle position, and when the first cable 4 is at the full position, the load lever 6 is also at the full position. But,
As shown by a solid line in FIG. 6B, when the drive rod 2 a 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 linked to the accelerator pedal moves as shown by the two-dot chain line in the figure,
The return spring 8 that returns the load lever 6 to the idle position when the cable travels within the projecting distance L of the driving rod 2a does not rotate the load lever, but moves the relay lever by the moving distance of the first cable exceeding the projecting distance. Rotate as shown by the dashed line in the figure.

In addition, the actuator 2 in the above vehicle
Is linked to an air suspension (not shown). For example, when the vehicle is a tractor and the tractor lowers the air pressure in the air suspension when connecting the trailer, the actuator 2 causes the rod 2a to project when the air pressure in the air suspension decreases. It has become. Thus, in the conventional engine speed control device 1, even when the accelerator pedal is erroneously depressed when the vehicle height is lowered to connect or disconnect the trailer, the engine speed does not increase and an accidental accident is prevented. I can do it.

[0005]

However, in the conventional engine speed control device 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 protruded, the first cable 4 inevitably becomes slack as shown in FIG. 6B by the amount of protrusion of the drive rod 2a, and this slack occurs between the loosened first cable and other parts. There was a risk of inducing interference. An object of the present invention is to control the maximum rotational speed of an engine by a limit speed governor, and an engine speed control device that does not interfere with other parts when a cable linked to an accelerator pedal releases the accelerator pedal Is 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 a first arm 13a and this arm 13a
Arm 13b forming a predetermined angle with both arms 13
a, the base end is integrally formed in the common base end of 13b the relay lever 13 to pivot point 13c, the accelerator pedal and the other end one end connected to the accelerator pedal 11 is connected to the front end of the first arm 13a 1st linked to the 11th step
Movement of the relay lever 13 in the first rotation direction by movement in the movement direction
A first cable 12 or a rod configured to be rotatable , and 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 for relaying
The movement of the lever 13 in the first rotation direction
Rotate the lever 17a from the idle position to the full position.
A second cable 14 or rod configured to be rotatable;
Vehicle equipped with a return spring 19 for returning the load lever 17a which rotates in Le position direction to the idle position
Is an improvement of the engine speed control device. Its characteristic configuration is that a floating arm 18 having a base end 18a pivotally attached to the vehicle body and a distal end 18b provided with a pivot point 13c of the relay lever 13, and the other end of the first cable 12 or the rod.
An actuator 21 provided on the vehicle body along the
A second cable, opposite to the first moving direction of the first cable 12 or the rod;
A tip provided on the actuator 21 so as to be able to protrude in the moving direction.
The end can contact the tip 18b of the floating arm 18.
Drive rod 21a and a projecting
Arm 1 with the driven rod 21a
Stopper 22 for fixing by clamping the 8 tip 18b and Rita
Flow with a force smaller than the return elastic force of the spring 19
Abuts the tip 18b of the towing arm 18 against the stopper 22
And an auxiliary spring 18c for causing the drive rod 21
prohibits the rotation of the floating arm 18 when a protrudes.
Of the first cable 12 or rod in the first movement direction
Allows the relay lever 13 to rotate in the first rotation direction due to
When the drive rod 21a is retracted, the floating arm
18 to allow rotation of the first cable 12 or the rod
Auxiliary spring 18c regardless of movement in one movement direction
By and Li motor is stretched the first cable 12 or rod
Lever 13 by the elastic restoring force of the spring 19
In the first rotation direction .

[0007]

As shown in FIG. 2, when the actuator 21 is operated, the drive rod 21a protrudes and clamps the tip 18b together with the stopper 22, so that the rotation of the floating arm 18 is prohibited. 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, when the actuator 21 is not operated, the floating arm 18 is allowed to rotate. The tip of the floating arm 18 abuts on the drive rod 21a when the first cable 12 is in operation, and contacts the stopper 22 with a force smaller than the return elastic force of the return spring 19 when the first cable 12 is inoperative. Touch Floating arm 18
The pivot point 13c of the relay lever 13 is displaced during the rotation of the first cable 12. While the pivot point 13c is displaced, the first cable 12 does not slack, and even if the first cable 12 moves, the second cable 12 moves. 14 does not move. Floating arm 1
When the first cable 13 further moves after the distal end of the cable 8 comes into contact with the drive rod 21a, the second cable 14 moves in conjunction therewith.

[0008]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 3, in this example, the vehicle is a tractor. One end of a first cable 12 is connected to an accelerator pedal 11 of the tractor via a link mechanism 11a, and the other end of the first cable 12 is connected to a first lever of a relay lever 13.
Connected to the tip of arm 13a. As shown in FIGS. 1 and 2, the relay lever 13 includes a first arm 13a and a second arm 13b, which forms a substantially right angle with the first arm 13a in the present embodiment, with the base ends of both arms being common. The base end forms 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 12a fixed to the vehicle body. One end of a second cable 14 is connected to the end of the second arm, and the other end of the second cable 14 is connected to a load lever 17 a mounted on a limit speed governor 17 of the fuel injection pump 16. As a result, as shown in FIG.
Is turned on as shown by the solid line arrow, the load lever 17a can be rotated via the relay lever 13. This lever is used as the load lever 17a in FIG.
A return spring 19 is provided for restoring to the idle rotation position indicated by the one-dot chain line B. The return spring 19 causes 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 pivot point 13c pivotally attached to a distal end 18b of a floating arm 18 having a base end 18a pivotally attached to a vehicle body (not shown). The rotation is stopped or allowed by the actuator 21. The actuator 21 has a drive rod 21a that is driven in substantially the same direction as the direction of movement of the first cable 12, and projects the drive rod 21a when the actuator is operated so that the tip 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 holding the tip of the floating arm 18 together with the stopper 22 by the drive rod 21a. An auxiliary spring 18c is attached to the floating arm 18. Auxiliary spring 18c
When the first cable 12 and the actuator 21 are both in a non-operating state, the tip 18 of the floating arm 18 has a smaller force than the return elastic force of the return spring 19.
b is brought into contact with the stopper 22.

The actuator 21 is linked to an air suspension (not shown). The air suspension lowers the air pressure in the air suspension when the tractor connects the trailer to lower the vehicle height.
As shown in FIGS. 4 and 5, the inside of a cylindrical main body 21b of the actuator 21 is partitioned by a piston head 21c, and a spring 21d is provided on the drive rod 21a side. An air port 21e through which air is supplied / discharged is provided at the piston head side edge of the main body 21b, and the air is supplied or discharged 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 the tractor connects the trailer, the actuator 21 is in the inactive state, and 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, and the drive rod 21a
Is shrinking. When the tractor is running, the air is filled in the air suspension, and as shown in FIG. 5, the air is filled in the main body 21b through the air port 21e, and the actuator 21 is activated. The filled air presses the piston head 21c, and the driving rod 21a
Is extended. 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 configured as described above will be described. When the tractor is in a normal traveling state, the air suspension is filled with air, and the actuator 21 interlocking with the air suspension is shown in FIG.
As shown in FIG. 3, the drive rod 21a is extended, and the distal end 18b of the floating arm 18 is moved together with the stopper 22.
Sandwich. Since the distal end 18b of the floating arm 18 is clamped, the relay lever 13 rotates as shown by a two-dot chain 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, so that the second cable 14 moves the load lever 17a in two-dot chain line according to the amount of rotation of the relay lever 13. Will be rotated as shown.

When the tractor lowers the vehicle height by lowering the air pressure in the air suspension for connection or disconnection of the container, the actuator 21 linked to the air suspension contracts the drive rod 21a, thereby causing the floating arm 18 to move. Becomes rotatable. That is,
The floating arm 18 has a driving rod 21a as shown by a solid line from a position where the front end 18b contacts the stopper 22 as shown by a two-dot chain line in FIG.
It rotates within the range where it contacts. Floating arm 1
The rotation of 8 displaces the pivot point 13c of the relay lever 13,
As a result, the rotation of the floating arm 18 is linked with the movement of the first cable 12. While the pivot position is displaced, the first cable is not loosened 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 two-dot chain line, and the second cable 14 is linked to this.

[0013] The actuator in the above embodiment may be configured so that the amount of protrusion of the drive rod can be adjusted. In this case, the amount of movement of the first cable when the actuator is not operated can be adjusted by changing the position where the tip of the floating arm contacts. In the above embodiment, the first cable and the second cable have been described. However, the rod may be used to connect the accelerator pedal, the load lever, and the relay lever. Also,
In the above embodiment, the vehicle is a tractor, but a diesel engine equipped with a limit speed governor and a vehicle provided with an actuator may be, for example, a truck. Further , in the above embodiment, the actuator is linked to the air suspension, but the actuator may be controlled by a manual switch .

[0014]

As described above, according to the present invention, the drive
Prohibits the rotation of the floating arm when the moving rod protrudes
To move the first cable or rod in the first movement direction
Allows the relay lever to rotate in the first rotation direction by
Allow the floating arm to rotate when the rod is immersed
To move the first cable or rod in the first movement direction
Regardless of the first cable or rod by the auxiliary spring
By the elastic restoring force of the return spring
Since the relay is prohibited from rotating in the first rotation direction, when the actuator allows the floating arm to rotate, the pivotal position of the relay lever is displaced, and the first cable is depressed by a predetermined amount of the accelerator pedal. Does not move the second cable, 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 does not interfere with other components. Further, if the actuator is configured such that the amount of protrusion of the drive rod can be adjusted, the maximum rotation speed when the actuator is not operated can be adjusted.

[Brief description of the 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 sectional view showing a non-operating state of the actuator.

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Accelerator pedal 12 1st cable 13 Relay lever 14 2nd 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

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F02D 1/04

Claims (1)

(57) [Claims] 1. A first arm (13a) and said first arm (13a)
And the second arm (13b) forming a predetermined angle with both arms (13a, 13a).
b) a relay lever (13) integrally formed with a common base end and having the base end as a pivot point (13c); one end connected to an accelerator pedal (11), and the other end connected to the first arm ( 13a) is connected to the tip of the pedal and interlocks with the depression of the accelerator pedal (11)
The relay lever (13) is moved to the first direction by moving in the first moving direction.
A first cable (12) or a rod configured to be rotatable in the rotation direction, and one end connected to the tip of the second arm (13b) and the other end connected to a load lever (17a) of the fuel injection pump (16) The rotation of the relay lever (13) in the first rotation direction
Move the load lever (17a) to the idle position.
The second cable configured to be rotatable Luo full position direction (1
4) or an engine speed control device for a vehicle comprising a rod and a return spring (19) for returning the load lever (17a) rotated in the full position direction to the idle position, wherein the base end (18a) is pivotally connected to the vehicle body. The relay lever is attached to the tip (18b).
Floating arm with pivot point (13c) for (13)
(18), and along the other end of the first cable (12) or rod.
An actuator (21) provided on the vehicle body is connected to the first cable (12) or the rod in a direction opposite to a first moving direction.
The actuator (21) is provided so as to be able to protrude in the second movement direction.
The tip of the floating arm (18) is
b) a drive rod (21a) configured to be abuttable, and the projecting drive rod (21a) provided on the vehicle body and
Hold the tip (18b) of the floating arm (18)
Wherein a stopper (22) to and fixed return spring (1
9) The floating arm
The tip (18b) of the arm (18) is brought into contact with the stopper (22).
An auxiliary spring (18c), and when the drive rod (21a) projects, the floating
The rotation of the arm (18) is prohibited and the first cable (12) or
The relay lever (13) by moving the arm in the first movement direction
Of the drive rod (21) in the first rotation direction.
When the a) is immersed, the floating arm (18) is allowed to rotate.
The first moving direction of the first cable (12) or rod
Regardless of the movement to, by the auxiliary spring (18c)
Extend the first cable (12) or rod and
The relay lever is elastically restored by the turn spring (19).
An engine speed control device configured to prohibit the rotation in the first rotation direction of (13) .