JPH09109726A - Accelerator lever device of running work machine and the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stop the prime mover of a running work machine, etc., immediately by forcing an accelerator lever to make its dashing turning motion from the rotational range to the stopping position of the prime mover when a sub-lever is given some external force so as to be maintained in its state to be swung in a direction to get rid of its engagement with a resistor. SOLUTION: When any state of danger takes place during use of a running work machine, a knob 9 is beaten downward for forcing a disc 10 to descend together with a shaft body 8. In this case, the outer circumferential edge of the disc 10 pushes a projecting part n2 staying on the lower side outward by the action of a cam so as to swing a sub-lever 20, to push out an engaging part from the inside of an engagingly locking groove 20a and to have this state maintained until an accelerator lever 5 reaches a prime mover stopping position. Consequently, the accelerator lever 5 is made to lose its engagingly locking force by its engagement with a resistor 15, placed in its dashing turning motion up to a prime mover stopping position so that the prime mover may be immediately stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arcel lever device for controlling a prime mover such as a traveling work machine.

[0002]

2. Description of the Related Art A prime mover such as a walking tractor is designed to be stopped by a predetermined operation. In many cases, the arcel lever is rotated to a stop position beyond the stop position to stop the fuel by cutting the fuel. However, since it is not enough to reach the stop position during a normal deceleration (reduction in rotation speed) operation, many switching operations are required here. However, this may not allow quick operation when an emergency stop is required.

In order to cope with this, an accelerator lever device in which an emergency stop operating mechanism is associated with the accelerator lever has appeared, and this is seen in Japanese Patent Laid-Open No. 58-199227 and Japanese Utility Model Publication No. 62-009150. There are things that can be done. The former is to hold the emergency stop lever together with the handle and release the lever in an emergency to move the accelerator lever to the stop position by the force of the spring.
In the latter, an emergency stop rod is provided near the accelerator lever and the rod is pushed up in an emergency to move the accelerator lever to the stop position.

[0004]

In the former publication, however, it is a burden during normal operation to hold the emergency stop lever with the handle at all times, and in the latter publication. , It takes a considerable amount of force to push an emergency stop rod with a large inertia upward against the gravity.

An object of the present invention is to provide an accelerator lever device for a traveling work machine or the like which can rationally solve the above problems, and to immediately use a prime mover with a simple and small operating force such as a tapping operation. In addition to being able to be stopped, the accelerator lever can be accurately positioned at any position within its rotation range.

[0006]

In order to achieve the above object, the present invention provides an accelerator lever which is rotatable about a vertical axis and rotates the lever from a prime mover rotation range to a prime mover stop position. A spring is provided, a resistor is provided in the vicinity of the accelerator lever, which is configured to rotate about the vertical axis when an external force of a certain magnitude or more acts, and the accelerator lever is provided with a swingable sub-lever. A spring is provided for urging the sub-lever toward the resistor, and the sub-lever is engaged with the arc-shaped outer peripheral edge of the resistor in a state where relative displacement with the resistor is restricted. Locking grooves are formed at appropriate intervals, and when the sub-lever is held in a state of being swung in the direction in which it is disengaged from the resistor due to external force, the accelerator lever A configuration which is rotated at a stroke from the machine revs up the driving motor stopping position.

In the above invention, in order to perform the emergency stop operation of the accelerator lever, an appropriate emergency stop operation portion for associatedly operating the sub lever is provided, and specifically, the following operation is preferable.

That is, a disk for applying a required external force to the sub-lever is provided, and an emergency stop operation section for operating the disk is provided. The operation of this operation section causes the disk to engage the sub-lever with the resistor. The configuration is such that it is held in the released state.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are sectional side views showing the operating state of the accelerator lever device according to the present invention, and FIG.
FIG. 3 is a plan view showing a part of the device and the like in section.

In the figure, reference numeral 1 denotes a case member, which is mounted on the right handle or the like of a steering handle 2 of a walking tractor as a traveling working machine.

Reference numeral 3 denotes a vertical axis cylindrical portion formed in the central portion of the upper surface of the case member 1, and an accelerator lever 5 is rotatably fitted in a fixed position on an outer periphery of the vertical axis cylindrical portion through a retaining ring 4. . At this time, the accelerator lever 5 moves to the prime mover stop position p1.
And the highest speed position p3 in the engine rotation range.

Reference numeral 6 is a wire winding member fixed to the upper surface of the accelerator lever 5, and a connecting wire 7 extending from a fuel injection amount adjusting device of a prime mover (not shown) is provided with a spring (not shown) provided on the prime mover side. It is supposed to wind up against the tensile force of. A spring (not shown) for applying a biasing force to the accelerator lever 5 in the direction of arrow f1 shown in FIG. 3 is provided inside the case member 1 above the winding member 6.

Reference numeral 8 denotes a stepped shaft body which is inserted through the inner hole of the vertical axis cylindrical portion 3, and has a knob 9 as an emergency stop operating portion fixed to the upper end thereof and a disc 10 having an oval circular shape at the lower end thereof. On the way, a slide body 11 guided vertically in the circumferential surface of the inner hole of the vertical cylinder portion 3 is fitted. At this time, the disk 10 has a shape in which the center of the lower surface is recessed upward, and laterally long engaging recesses 10a, 10a are formed at both ends of the diameter. Reference numeral 12 is a spring for urging the shaft body 8 upward, and 13 is a cover body surrounding the spring 12. Here, between the shaft body 8 and the case member 1, there is provided a not-shown locking force applying means consisting of a ball pressed by a spring and a groove for guiding the ball, and the disk 10 is shown by a solid line in FIG. At the three positions of the illustrated raised position, the normal position shown by the phantom line k in the figure, and the lowered position shown in FIG. 2, elastic force is exerted elastically by the locking force of an appropriate magnitude generated by the locking force applying means. Make it fixed.

Reference numeral 14 denotes a protruding shaft formed in the center of the bottom surface of the case member 1. A disk-shaped resistor 15 is rotatably fitted on the shaft 14 so as to make surface contact with the bottom surface of the case member 1. . At this time, radial engaging grooves 15a are provided on the peripheral edge of the resistor 15 at appropriate intervals, and the width of the engaging grooves 15a is described later.
It is assumed that the thickness almost matches the thickness of 0. And resistor 1
A disc spring 16 and a spring retainer 17 are placed in this order on the upper surface of 5, and the spring retainer 17 is fixed so as to press the disc spring 16 via a fixing bolt 18 screwed to the protrusion shaft 14. There is. Therefore, the resistor 15 receives the resilience of the disc spring 16 and is pressed against the bottom surface of the case member 1, and generates a proper amount of resistance force between the resistor 15 and the bottom surface during rotational displacement.

Reference numeral 19 designates a vertical support shaft fixed midway in the radial direction of the accelerator lever 5, to which a sub-lever 20 is swingably fitted via a fulcrum portion 20a. The sub-lever 20 serves as an operating portion outside the fulcrum portion 20a and serves as an engaging portion 20b inside. The vertical edge of the engaging portion 20a is formed with a mountain-shaped recess a at the center of the height to form the upper and lower portions into the protrusions n1 and n2. The projection n2 is formed so as to enter into any one of the locking grooves 15a of the resistor 15, and the disk 10 is in the normal position indicated by the phantom line k.
The peripheral edge of the is associated with the recess a. At this time, the sub-lever 20 is provided with a spring (not shown) for applying a biasing force to the inner side f2.

Reference numeral 21 denotes a stopper portion provided near the bottom surface of the case member 1, and when the accelerator lever 5 is rotated from the high speed side to the minimum speed position p2 with the sub lever 20 being swung inward f2. , The lower end of the engaging portion 20a is locked to prevent further rotation, and when the lever 20 is rocked outward f3, the interference with the lever 20 is released and the accelerator lever 5 is released. Is allowed to rotate to the prime mover stop position P1.

Reference numeral 22 denotes a horizontal shaft rotatably mounted in the middle of the height of the case member 1. A steel wire member 23 bent in a U shape is bolted to the center of the shaft and an arm is provided at one end thereof. The member 24 is fixed, and each end of the steel wire member 23 is engaged in the engaging recess 10a of the disk 10. 25
Is an operation wire as an emergency stop operation unit connected to the arm member 24, and 26 is a guide tube for the wire 25.

In the device of the present invention constructed as described above,
When controlling the rotation of the prime mover in a normal use state, the knob 9 is operated to set the disk 10 to the normal position indicated by the imaginary line k, and the engaging portion 20b of the sub-lever 20 is placed in the arbitrary locking groove 15a. The accelerator lever 5 is rotated to an appropriate position in the fitted state.

In this case, the engaging portion 20b of the sub-lever 20
Is pressed inwardly of the locking groove 15a by the urging force of a spring (not shown).
The engagement portion 20b does not slip out of the locking groove 15a unless a swinging operation force is applied to the lock groove 3. In this way, the sub-lever 20 is surely turned into the same body as the resistor 15 by rotationally operating the accelerator lever 5, and is rotationally displaced about the vertical axis tube portion 11.

Here, when the accelerator lever 5 is rotated to the high speed side, the pulling force acting on the linkage wire 7 by the spring on the prime mover side and the spring (not shown) acting directly on the accelerator lever 5 (in the case member) The force applied to the lever 5 is larger than that to which the resistance generated by the resistor 15 is added. In addition, when the accelerator lever 5 is in the prime mover rotation range and no operating force is applied,
The resistance generated by the resistor 15 overcomes the spring force acting on the lever 5 toward the prime mover stop position p1 to bring it into a stationary state. Therefore, the accelerator lever 5 is operated only by the rotation of the driver. It will be fixed accurately at any position in the rotation range. On the other hand, in order to rotate the accelerator lever 5 to the low speed side, the resistance of the resistor 15 gives a larger operating force than the rotation restricting force acting on the lever 5, and the operating force at this time is the same. Is relatively small due to the influence of the spring force acting on the side of the prime mover stopping position p1.

When the accelerator lever 5 is in the rotation range of the prime mover and the prime mover is rotating, when the prime mover is stopped, the accelerator lever 5 is first rotated to the low speed side to engage the sub-lever 20. The lower end of the portion 20b reaches the position where it collides with the stopper portion 21, that is, the lowest speed position p2. Here, the sub-lever 20 is moved outward f3.
By swinging to b, the accelerator lever 5 is rotated to the prime mover stop position p1 while maintaining the state in which the engaging portion 20b is disengaged from the locking groove 15a. As a result, no fuel is supplied to the prime mover and the prime mover stops.

On the other hand, if a dangerous state occurs during use of the traveling work machine, the knob 9 is tapped downward, whereby the disk 10 descends together with the shaft body 8 to the state shown in FIG. At this time, the outer peripheral edge of the disk 10 pushes the lower protrusion n2 outwardly f3 by the cam action to swing the sub-lever 20, and pushes the engaging portion 20b out of the locking groove 20a. Is held until the accelerator lever 5 reaches the prime mover stop position p1. Therefore, the accelerator lever 5 loses the locking force due to the engagement with the resistor 15, and is swung to the prime mover stop position p1 all at once by the spring force in the direction of the arrow f1, and the prime mover is immediately stopped.

After this emergency stop operation, in order to make the prime mover ready for use again, the knob 9 is pulled up and the disk 10
Is reset to the normal position indicated by the virtual line k. As a result, the sub-lever 20 can be swung around the vertical support shaft 19 and fitted again into the locking groove 15a of the resistor 15.
After that, the accelerator lever 5 comes to rest at an arbitrary position in the rotation range of the prime mover as described above, and the prime mover can be used.

The operation wire 25 may be pulled in the direction of the arrow f4 instead of the operation of the knob 9 described above. In this case, the arm member 24 is provided with the horizontal shaft 22 and the steel wire member 23, and the disk 10 is moved. Is displaced upward to bring it into the state shown by the solid line in FIG. In connection with this, the outer peripheral edge of the disk 10 pushes the protrusion n1 on the upper side of the sub-lever 20 toward the outer side f3 by the cam action to swing the lever 20 to move the engaging portion 20.
As a is pushed out from the engaging groove 15a of the resistor 15, the prime mover is immediately stopped as described above.

After that, in order to make the prime mover ready for use again, the knob 9 is pushed down, and the disk 10 is reset to the normal position indicated by the virtual line k as described above.

[0026]

According to the present invention described above, it is possible to deal with an emergency stop without requiring any special operation such as gripping the emergency stop handle during the operation of the traveling work machine, and swinging the sub-lever. In addition to being able to immediately stop the prime mover by a simple operation that only moves it (such as hitting or pulling), it is also possible to accurately stop the accelerator lever at any position within the prime mover rotation range. .

[Brief description of the drawings]

FIG. 1 is a vertical sectional view showing an operating state of an accelerator lever device according to the present invention.

FIG. 2 is a vertical cross-sectional view showing another operating state of the accelerator lever device.

FIG. 3 is a plan view showing a part of the accelerator lever device and the like with a part thereof in section.

[Explanation of symbols]

 5 Accelerator Lever 9 Emergency Stop Knob 11 Vertical Axis Cylinder 15 Resistor 15a Locking Groove 20 Sub Lever p1 Motor Stop Position

Claims (3)

[Claims] 1. An accelerator lever is provided which is rotatable about a vertical axis, and a spring is provided for rotating the lever from a prime mover rotation range to a prime mover stop position.
In the vicinity of the accelerator lever, there is provided a resistance body that rotates about the vertical axis when an external force of a certain magnitude or more acts, and the accelerator lever is provided with a swingable sub-lever and the sub-lever resists. A structure in which a spring for urging to the body side is provided, and a locking groove with which the sub-lever is engaged with the arc-shaped outer peripheral edge of the resistor in a state in which relative displacement with the resistor is restricted. When the sub-lever is held in a state of being swung in the direction in which the external lever is applied and the engagement with the resistor is released,
An accelerator lever device for a traveling work machine or the like, characterized in that the accelerator lever is swung all at once from the prime mover rotation range to the prime mover stop position. 2. A sub-lever is provided with a disk for applying a required external force, and an emergency stop operation section for operating the disk is provided. By operating this operation section, the disk engages the sub-lever with a resistor. The accelerator lever device for a traveling work machine or the like according to claim 1, wherein the accelerator lever device is held in a released state. 3. The accelerator lever device for a traveling work machine or the like according to claim 2, wherein the operation of the emergency stop operation portion is performed by hitting a knob provided above the accelerator lever.