JPH018425Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a traveling speed control device for a mobile agricultural machine.

If a vehicle such as a mobile agricultural machine is suddenly turned while traveling at high speed on the road, the machine may lose stability and roll over, or the steering wheel may not be operated in time and the machine may collide with an obstacle. This can easily lead to accidents. In order to eliminate this danger, a system has been proposed in which when the steering wheel or brakes are operated, the engine rotational speed is automatically lowered to reduce the running speed. but,
Unlike general vehicles, mobile agricultural machinery that travels through soft fields requires the highest output when turning, and like the conventional machines mentioned above, the engine speed decreases when turning. However, the disadvantage is that the engine may stop due to insufficient output.

The purpose of this invention is to solve the problems of the conventional technology as described above, and to automatically reduce the engine speed when turning at high speeds on the road to enable safe turning. To provide a running speed control device for a mobile agricultural machine that does not reduce the engine speed even when turning is performed during low-speed running, and prevents the engine from stopping.

The traveling speed control device for a mobile agricultural machine according to the present invention achieves the above object, in which an engine rotational speed adjustment mechanism is interlocked and connected to a steering handle and an auxiliary gear shift lever that changes the vehicle speed to high or low speed, and the auxiliary gear shift lever is set to a high speed position. At some times, the rotational speed adjustment mechanism of the engine is set to a low speed in conjunction with the steering operation of the steering handle, and when the sub-shift lever is in the low speed position, the rotational speed adjustment mechanism of the engine and the steering handle are interlocked. The feature is that the relationship is configured to be inactive.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described in detail below.

The figure shows an outline of the case where the traveling speed control device according to the present invention is applied to a passenger tractor.
In the figure, reference numeral 1 denotes a steering handle for steering the aircraft, and by rotating the steering handle 1, a pitman arm 2
can be rotated left and right around the shaft 2a. One end of wires 3, 3 is connected to the Pitman arm 2 on both sides with the shaft 2a in between, and the other end is connected to an interlocking wire 4.
The inner wire 4a is connected to one end of the inner wire 4a. Therefore, when the steering handle 1 is operated, the inner wire 4a is pulled to the left in FIG. 1 regardless of whether the steering handle 1 is operated in the left or right direction.

Reference numeral 5 denotes a sub-shift lever provided separately from a general main shift lever (not shown). The sub-shift lever 5 is configured to be able to be switched alternately between a low speed position L and a high speed position H around a shaft 5a. Therefore, when driving in the field, the auxiliary gear shift lever 5
is set to a low speed position L, and is set to a high speed position H when driving on the road. One end of a rod 6 that is slidable in the axial direction is connected to an end of the sub-shift lever 5, and a pair of links 7, 7 and 8, 8 are connected to the other end of the rod 6, respectively. There is. Of these, links 8 and 8
is slidably fitted into a guide 9 fixed to the body. The outer wire of the above-mentioned interlocking wire 4 is separated into two parts 4b and 4b', one end of which is connected to the links 8, 8, respectively. The other end of one outer wire 4b is fixed to the fuselage, and the other end of the other outer wire 4b' is connected to a rod 10 in an engine speed adjustment mechanism, which will be described later. Therefore, when the sub-shift lever 5 is set to the low speed position L as shown in FIG. 1, the distance between the links 8, 8 is s, but
When set to high speed position H as shown in Figure 2,
The links 8, 8 are pushed apart, and the inner wire 4a is pulled by displacing the outer wires 4b, 4b', respectively.

Rod 1 in engine speed adjustment mechanism
0 is rotatably connected to a throttle lever 13 that adjusts the rotational speed of the engine, and when the throttle lever 13 is shifted between a high speed position H and a low speed position L, the throttle lever 13 follows and moves left and right. They are starting to move. A long hole 10a is bored in the middle of the rod 10.
The lower end of the engine rotational speed adjustment lever 11 is engaged with a. Furthermore, a spring 12 is stretched between the lower end of the engine rotational speed adjustment lever 11 and the rod 10, so as to always bias the engine rotational speed adjustment lever 11 toward the high speed position H side of the elongated hole 10a. I have to. Further, the end of the inner wire 4a mentioned above is located at the lower end of the rotational speed adjusting lever 11 of this engine, and as shown in FIG. They are connected in this way. Conversely, move the sub-shift lever 5 to high-speed position H.
When the inner wire 4a is set to , the inner wire 4a is pulled to the left in the figure as described above, so that the end of the inner wire 4a in the above-mentioned relaxed state changes to a tensioned state. Similarly, when the steering handle 1 is turned all the way, the inner wire 4a is pulled to the left in the figure, changing to a tensioned state. Now, in the above-mentioned device, if the sub-shift lever 5 is set to the low speed position L for field work, then the inner wire 4a of the portion connected to the engine speed adjustment lever 11 is
Since the inner wire 4a is in a relaxed state, even if the steering handle 1 is operated to turn the inner wire 4a, the relaxed state of the inner wire 4a only changes to a tensioned state, and the rotational speed of the engine is not affected. Therefore, unlike conventional devices, there is no problem in which the rotational speed of the engine decreases due to the turning operation, causing the engine to stop.

On the other hand, when the sub-shift lever 5 is set to the high speed position H for driving on the road, the inner wire 4a connected to the engine speed adjustment lever 11 is in a tensioned state. 1, the inner wire 4a resists the spring 12 and pulls the engine rotation speed adjustment lever 11 toward the low speed position L side of the elongated hole 10a, reducing the engine rotation speed and the vehicle speed, ensuring safe rotation. Directions can be made. When the turning operation is completed and the steering handle 1 is returned to the straight-ahead state, the inner wire 4a becomes loose, so the spring 12
The restoring force of the engine speed adjustment lever 1
1 is returned to the high speed position H side, and the original vehicle speed is automatically restored.

As mentioned above, in the above device, when steering at high speed on the road, by turning the steering wheel 1, the engine rotational speed is automatically reduced and the vehicle speed is reduced, and when the turning is completed, the steering wheel is turned. When the handle 1 is returned to its original position, the original speed is automatically restored, allowing safe turning without causing rollover. In addition, such adjustment of the engine rotational speed only works when driving at high speeds, and becomes inactive when driving at low speeds during field work, so even if the steering wheel 1 is turned during low-speed driving, the engine rotation will not change. The speed will not drop and the engine will not stall due to field diverted loads.

The device of the present invention described above can be effectively applied not only to the riding tractor in the embodiment but also to other mobile agricultural machines such as a riding rice transplanter.

As described above, the traveling speed control device for a mobile agricultural machine according to the present invention interlocks and connects the engine rotational speed adjustment mechanism to the steering handle and the sub-shift lever that changes the vehicle speed, and when the sub-shift lever is in the high speed position. At some times, the rotational speed adjustment mechanism of the engine is set to a low speed in conjunction with the steering operation of the steering wheel,
When the sub-shift lever is at a low speed position, the interlocking relationship between the engine rotational speed adjustment mechanism and the steering handle is configured to be inactive;
When driving at high speeds, the engine speed is automatically reduced when turning to enable safe turning, and when driving at low speeds in the field, the engine speed does not drop even when turning is performed. It is possible to prevent engine stop from occurring.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing the outline of a device according to an embodiment of the present invention, Fig. 2 is a view taken in the direction of arrow A in Fig. 1, and Fig. 3 is a state in which the sub-shift lever shown in Fig. 1 is set to the high speed position. FIG. 1... Steering handle, 4a... Inner wire,
4b, 4b'... Outer wire, 5... Sub-shift lever, 6, 10... Rod, 10a... Oblong hole, 11
...Engine speed adjustment lever, 13...Throttle lever.

Claims (1)

[Scope of utility model registration request] An engine rotation speed adjustment mechanism is interlocked and connected to a steering wheel and an auxiliary gear shift lever that changes the vehicle speed, and when the auxiliary gear shift lever is in a high speed position, the engine rotates in conjunction with the steering operation of the steering handle. A mobile agricultural machine characterized in that the speed adjustment mechanism is set to a low speed, and the interlocking relationship between the rotational speed adjustment mechanism of the engine and the steering handle is rendered inactive when the auxiliary speed change lever is in the low speed position. travel speed control device.