JPH10148140A - Acceleration device for work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate fine regulation of engine speed in a working rotating range by providing with a non-linear interlocking mechanism for suppressing a fluctuation rate of engine speed in relation to an unit manipulated variable of a hand acceleration operating tool in a high rotating range for work, smaller than a fluctuation rate in a region of a high rotating range and less. SOLUTION: In an acceleration device A, a hand acceleration lever 7 is pivotally supported at a sliding axial core P of right and left directions freely to oscillate in the longitudinal direction, and an acceleration wire 15 is pivotally supported and connected to the action support point X of its lever lower end. In a condition in which the lever 7 is positioned on a forefront side of an acceleration offcondition, the supporting point X is positioned just below the axial core P. In a full-accelerating condition in which the lever 7 is positioned in a farthest backward direction, the radial of the axial core P of the supporting point X in relation to the manipulated variable of the wire 15 is set so as to position the supporting point X just beside the axial core P. The manipulated variable of the wire 15 of the lever 7 slant angle makes in a maximum level in the vicinity of a lowest speed position S, and makes in a minimum level in the vicinity of a highest speed position H.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an accelerator device for a working machine such as a combine or a tractor, and more particularly, to a linkage structure between a hand accelerator operating tool and an accelerator device and a display means for a tachometer.

[0002]

2. Description of the Related Art In a working machine, it is common practice to set the engine speed to a rated output (maximum output), and to set the engine speed near the maximum speed by a hand accelerator lever before starting the work. Get started. Conventionally, as shown in FIG. 10, an accelerator wire 15 for operating an accelerator device is connected to a winding drum 7 d that is rotated by a hand accelerator lever 7, and an engine with respect to a unit operation angle of the hand accelerator lever 7. The amount of change in the rotational speed changed linearly. (See the phantom line in FIG. 4)

[0003]

As described above, the engine speed is set in the working rotation range near the maximum speed before the start of work. However, since the work load on that day is lighter than usual, the engine speed is slightly increased. Set the number of rotations to a low eye, etc.
Fine adjustment of the number of rotations in the working rotation area is often performed. In the conventional structure, even if the hand accelerator lever is slightly moved to slightly change the rotation speed in the working rotation range, the rotation speed fluctuates more than expected and it tends to be difficult to match the desired rotation speed. Was. SUMMARY OF THE INVENTION An object of the present invention is to provide an accelerator device in which fine adjustment of an engine speed in a working rotation range can be easily performed.

[0004]

[Means for Solving the Problems]

[Structure] The first invention relates to a unit operation amount of a hand accelerator operating tool in a region not higher than a high rotation region for work, which is a variation of an engine speed with respect to a unit operation amount of the hand accelerator operating device in a high rotation region for work. A non-linear interlocking mechanism for reducing the variation of the engine speed with respect to

According to a second aspect of the present invention, in the first aspect, a tachometer for displaying an engine speed in an analog manner is provided, and a moving angle of a pointer per unit speed in the tachometer is a high speed range for work. It is characterized in that it is set so that those below the high rotation range for the work are smaller than those for the work.

According to the structure of the first aspect, the variation of the engine speed with respect to the unit operation amount of the hand accelerator operation tool is small in the working rotation range and large in the other range. Will be done. In other words, in the work rotation region, which is a high-speed rotation region, the rotation fluctuation with respect to the accelerator operation becomes relatively insensitive, and in the region below the work rotation region, the rotation fluctuation with respect to the accelerator operation becomes relatively sensitive. It is easy to perform a fine adjustment operation for slightly changing the rotation speed, and it is possible to easily realize an intended rotation speed, and to quickly set the rotation speed to the rotation speed.

For example, when the entire operation amount of the hand accelerator operating tool is the same as that of the related art, the lever operation amount corresponding to the working rotation region becomes large, and the lever operation amount corresponding to the lower rotation speed region becomes smaller. As a result, the engine speed can be increased more quickly to the working rotation range than before, and the rotation speed can be finely adjusted more conveniently in the high-speed working rotation range than before.

According to the second aspect of the present invention, in the conventional analog tachometer, the moving angle of the pointer per unit number of rotations is set to be equal, for example, the display scale of the engine rotation number is set at equal angular intervals. However, in the case of the present application, the movement angle of the indicator needle per unit number of rotations in the working rotation range is adjusted by, for example, corresponding to an increase in the operation amount of the hand accelerator operating tool in the working rotation range. It is wider than that of the following rotation speed. This makes it possible to visually recognize that the amount of operation of the hand accelerator lever in the working rotation range has been expanded, so that a rotation display according to the actual accelerator operation status can be performed, and the accelerator operation can be performed more easily. Become.

In the accelerator device according to any one of the first and second aspects, a non-linear interlocking mechanism that operates so as to make the fluctuation of the rotational speed with respect to the accelerator operation amount slower in a high rotational speed region is provided by a non-linear interlocking mechanism. While making the rotation speed rise quickly, fine adjustment of the rotation speed in the frequently used work rotation range became easy, and excellent operability in accordance with the actual situation was achieved.

In the accelerator device according to the second aspect, the moving angle of the pointer in the tachometer can be increased in the working rotation range so as to correspond to the increase in the operation amount of the hand accelerator lever in the working rotation range. The rotation speed fine adjustment operation in the working rotation range has become easier to understand visually, and has been made easier to use.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a combine as an example of a working machine, 1 is a reaping unit, 2 is a control unit, 3 is a crawler traveling device, 4 is a threshing device, 5 is an engine, and 6 is a mission. As shown in FIG. 2, the control unit 2 includes a control tower 10 provided with a steering lever 8 and an instrument device 9 for controlling the steering of the body and elevating the reaping unit 1, a driving seat 11, and a driving seat 1.
1 comprises an operation box 12, a floor step 13 and the like arranged on the left side of the apparatus 1. The number of revolutions of the engine 5 is set by a hand accelerator lever (an example of a hand accelerator operating tool) 7 provided in the control unit 2, and the accelerator device A will be described.

As shown in FIGS. 1-3, an accelerator device A
Is the governor device 14 of the engine 5 and the operation box 12
And a hand accelerator lever 7 arranged at the front end of the vehicle are connected by an accelerator wire 15 in an interlocking manner. The hand accelerator lever 7 is pivotally supported to be able to swing back and forth about a swing shaft center P in the left and right direction, and an accelerator wire 15 is pivotally connected at an operating fulcrum X at the lower end of the lever. The receiving portion 15a is pivotally supported at the same height position as the swing axis P at the same horizontal axis Z as the swing axis P so that the angle can be changed.

In the lever operation path of the lever guide 16, the accelerator is off (idling or the like).
In the state where the hand accelerator lever 7 is located at the foremost side, the operating fulcrum X is located almost directly below the pivot axis P and the hand accelerator lever 7 is located at the most rearward state. In this example, the radius of the operation fulcrum X with respect to the operation amount of the accelerator wire 15 with respect to the oscillation axis P is set such that the operation fulcrum X is located almost directly beside the oscillation axis P. Therefore, the operated amount of the accelerator wire 15 with respect to the tilt angle of the lever 7 is largest near the lowest speed position S, and is smallest near the highest speed position H.

The hand accelerator lever 7 having the above structure
Between the operation amount of the accelerator wire 15 and the operation amount of the accelerator wire 15, that is, the swing axis P of the hand accelerator lever 7.
As shown in FIG. 4, the relationship between the surrounding unit operation angle and the rotation speed of the engine 5 is a graph of a substantially arcuate line that is convex upward. That is, when the hand accelerator lever 7 is moved from the lowest speed position S to the highest speed position H, the operated amount of the accelerator wire 15 decreases as the lever operation angle increases, and the engine speed gradually increases. Works to be dull.

That is, the amount of change in the engine rotation speed with respect to the unit operation amount of the hand accelerator lever 7 in the high rotation speed range for work is calculated by comparing the amount of engine rotation with respect to the unit operation amount of the hand accelerator lever 7 in the region below the high rotation speed range for work. The nonlinear interlocking mechanism C that makes the amount of change smaller than the number is configured. Therefore, in the working rotation range F set near the maximum rotation speed, a gentle change state is brought about such that the engine rotation speed hardly fluctuates even if the hand accelerator lever 7 is moved back and forth. As a result, fine adjustment of the number of revolutions in the working rotation range is made very easy.

As shown in FIG. 5, the meter device 9 is provided with a tachometer 17 for displaying the engine speed in an analog manner. In this tachometer 17, the indicating needle 1 per unit rotation speed is used.
The moving angle of 7a is set to be smaller in the high rotation range F for work than in the high rotation range F for work. That is, the relationship between the operation amount of the hand accelerator lever 7 and the operated amount of the accelerator wire 15 described above is directly replaced with the movement angle of the pointer 17a, and the proper rotation range a, the light load rotation range b, and the limit rotation range. The angle range of the working rotation range F composed of c is larger than the arithmetic ratio of the engine speed to the entire rotation range. The rotation range d in the appropriate rotation range a is a recommended rotation range, and is usually set to the recommended rotation range d.

For example, the maximum rotational speed is 3200 rpm, and the working rotational range F is 2400 rpm to 3200 rpm.
Then, the arithmetic ratio of the working rotation range F to the entire rotation range is (3200-2400) / 3200 = 1/4.
= 25%, and assuming that the total movement angle of the pointer 17a is 100 degrees, the conventional display angle of the working rotation range F is 2
5 degrees. On the other hand, in the case of the present application, the display angle of the working rotation range F is expanded to about 45 degrees from the arithmetic ratio by the trigonometric function under the above conditions. Therefore, the tachometer 17 is easy to use.

Next, the lock device B for the steering lever 8 will be described. As shown in FIGS. 6 and 7, the steering lever 8 has a cross-operated structure, and can perform a left or right turn by a left-right operation.
The reaper 1 is configured to be linked so as to move up later. The lock device B includes a lock plate 18 having a swing fulcrum Y at a rear position of the steering lever 8 and a knob bolt 19 capable of locking the position of the lock plate 18.

The lock plate 18 is a stop piece 18 having an arc-shaped inner edge 20 centered on the swing fulcrum Y just in front of the steering lever 8 in the free state.
a, and a lock piece 18b having a nut portion 21 for the knob bolt 19, and is formed in a substantially "S" shape. On the upper surface 10a of the control tower 10, an arc-shaped guide groove 22 centered on the swing fulcrum Y is formed. By tightening a knob bolt 19 passing through the guide groove 22, the lock plate 18 is moved to the control tower upper surface 10a. It can be locked and fixed.
In addition, a portion other than the lock position of the guide groove 22 on the control tower upper surface 10a is raised by one step to form a convex portion 23 by bulging by press forming or the like, thereby providing a step. Thus, even if the knob bolt 19 is slightly loosened, the stepped portion of the projection 23 prevents the knob 23 from moving to the release position, and can reliably maintain the lock position.

According to the lock device B having the above-described configuration, the knob bolt 19 is loosened and moved, and as shown in FIG. The stop piece 18a smoothly moves to the front side of the steering lever 8 and is positioned in contact with the lever 8, and is locked so that the lowering operation of the reaper 1 is disabled. And knob bolt 1
9, the lock plate 1 as shown in FIG.
When the lock 8 is locked at the release position, the stop piece 18a is located out of the operation range of the steering lever 8, so that the turning operation of the body and the lifting operation of the reaping unit 1 can be performed freely.

As shown in FIG. 8, the lock device B is configured such that the inner edge 20 of the stop piece 18a at the lock position is formed in a straight line so that the steering operation can be performed even when the reaper 1 is in the downwardly locked state. Is also good. In the latter structure, it is possible to move and travel, and unexpected lowering of the reaper 1 in that state is prevented, which is convenient. In the former structure described above, in addition to preventing the mowing part 1 from being lowered, the right and left operation of the steering lever 8 can be controlled by contact with the arc inner edge 20, that is, an unexpected steering operation can be suppressed. This is convenient for maintenance work when the machine is stopped.

[Another Embodiment] As shown in FIG. 9, the groove 8a of the accelerator lever 8 that slides and the bracket 15b that slides up and down at the base end of the accelerator wire 15 are connected by pins. Even in the non-linear interlocking mechanism C, the vertical sliding amount of the bracket 15b with respect to the lever sliding amount changes so that the vertical sliding amount of the bracket 15b with respect to the lever sliding amount becomes small in the high-speed working region. good.

[Brief description of the drawings]

FIG. 1 is a side view of a combine.

FIG. 2 is a plan view of a control unit.

FIG. 3 is a side view showing the accelerator device.

FIG. 4 is a diagram showing a rotation speed change graph with respect to a lever operation amount by a nonlinear interlocking mechanism;

FIG. 5 is a plan view showing a tachometer.

FIG. 6 is a plan view showing the entire structure of the lock device.

FIG. 7 is a sectional view showing a lock structure of the lock device.

FIG. 8 is a plan view showing another structure of the lock device.

FIG. 9 is a side view showing another structure of the nonlinear interlocking mechanism.

FIG. 10 is a diagram showing a conventional accelerator device.

[Explanation of symbols]

 7 Hand accelerator operation tool 17 Tachometer 17a Pointer C Non-linear interlocking mechanism

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroaki Inomata 64 Ishizu-Kitacho, Sakai-shi, Osaka Inside Kubota Sakai Works

Claims (2)

[Claims] 1. An engine rotational speed variation amount with respect to a unit operation amount of a hand accelerator operating tool in a high rotation speed range for work is calculated based on an engine speed relative to a unit operation amount of the hand accelerator operation tool in a region equal to or lower than the high rotation speed range for work. An accelerator device for a working machine having a non-linear interlocking mechanism for reducing the fluctuation amount of the rotation speed. 2. A tachometer for analog display of an engine speed is provided, and a moving angle of a pointer per unit number of rotations of the tachometer is higher than that of a high speed range for work. 2. The accelerator device for a working machine according to claim 1, wherein the accelerator device is set so as to reduce the size of the components below the range.