JPH0577362B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a traveling device for an agricultural working machine in which a working machine such as a rice transplanter is mounted on a traveling vehicle body so as to be operable to move up and down.

[Prior art]

Conventionally, as disclosed in Japanese Utility Model Application Publication No. 55-34778, a rice transplanter is attached to a traveling vehicle body so that it can be raised and lowered,
A technical means is disclosed for switching a double belt transmission mechanism for high-speed and low-speed transmission from the high-speed side to the low-speed side when the rice transplanter is raised.

Additionally, Japanese Patent Application Laid-Open No. 52-50826 discloses a technical means in which a belt continuously variable transmission mechanism is activated to switch the running speed to a lower speed side when the reaping section is raised in a combine harvester. .

However, these prior art techniques lack an adjustment device for changing the relationship between the travel speed and the height of the work implement.

[Problem to be solved by the invention]

In the conventional technology, the traveling speed is decelerated as the work equipment ascends, but since there is no adjustment means to properly adjust this deceleration state, the vehicle speed remains constant regardless of whether the operator's driving skills are good or bad. There have been times when I have had to turn in a dangerous situation and not be able to improve efficiency. However, simply providing this adjustment means has the drawback that the appropriate working speed may be ignored, and easy adjustment is not allowed from the perspective of the working state of the working machine.

[Means to solve the problem]

This invention takes the following technical means to solve the above problems.

That is, in this invention, the working machine 3 is attached to the traveling vehicle body 1 via the lift mechanism 2 so as to be movable up and down, and when the working machine 3 rises to a certain height, the traveling speed of the traveling vehicle body 1 becomes low. In an agricultural working machine having a vehicle speed changing device provided with a linkage mechanism that links the traveling transmission of the traveling vehicle body 1 and the lifting of the working machine 3,
A traveling device for an agricultural working machine, wherein the linking mechanism is provided with an idle linking means that does not change the traveling speed until the working implement 3 is raised to a certain height, and a speed adjusting means A that adjusts the traveling speed at least on the low speed side. And so.

[Operation and effect of the invention]

According to this invention, when the work equipment is lowered, accurate work can be performed without any fluctuation in travel speed even if the work equipment is moved up and down a little, but the work equipment is raised above its standard height. When turning, etc., the running speed automatically slows down to make turning easier, and since you can change and adjust the running speed when turning, etc., you can drive at the appropriate speed depending on whether you are a good or bad driver and the field conditions. .

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS A riding-type rice transplanter which is an embodiment of the present invention will be described in detail based on the drawings.

In FIG. 1, a planting machine 3 is connected to the rear of a traveling vehicle 1 via a lift mechanism 2 so as to be able to move up and down. An input pulley 9 mounted on the input shaft 8 is connected by a belt 11. As shown in FIG. 2, the split pulley 6 consists of a cone 6a fixed to the output shaft 5 and a cone 6b that is slidable with respect to the output shaft 5 and has the habit of coming into pressure contact with the cone 6a. So, both cones 6
By changing the distance between a and 6b, that is, the width of the split pulley 6, the effective diameter at which the belt 11 contacts changes.

A tension pulley 31 is in pressure contact with the inner side of the slack side of the belt 11, and the base of a tension arm 32 having the pulley 31 mounted on its free end is pivoted to the body side by a shaft 33. At the free end of the short arm 35, the outer end of the bellcon piston rod 41 is connected to a pin 42.
Piston rod 41
A slide member 43 receiving an inner end portion of the slide member 43 is loosely fitted into a bell-con cylinder 44 provided on the fuselage. The switching member 46, which has one end of the wire 19 locked at its free end, switches the bellcon valve 4 by its rotation.
7. When the rice transplanter rotates, the lift mechanism 2 rotates in the direction of arrow A in FIG.
Pressure oil from the pump 48 is then switched to the passage 47b and flows into the valve cylinder 44 through the passage 49. As a result, the bellcon piston rod 41 moves in the direction of the arrow B, rotating the tension pulley 31 to the position shown by the chain line 31A, and as a result, the belt 1
1 is the split pulley 6 in the state shown by the chain line 11A.
The width of the input pulley 9 increases, the effective diameter of the split pulley 6 that contacts the belt 11 becomes smaller, and the number of rotations of the input pulley 9 decreases.

In addition, in the embodiment, the wire 19 is given slack so that the lift amount of the planting machine 3 is approximately
A floating interlocking means is provided to prevent the tension pulley 31 from interlocking up to 400 mm.

Further, the bellcon piston rod 41 is provided with a speed adjusting means A using a turnbuckle mechanism.

In the configuration of the above example, when the planting machine 3 is raised, the planting machine 3 rises approximately 400 meters from the planting soil surface.
Connect the wire 19 to the switching member 4 until it rises by about mm.
6 is not pulled and rises freely, and when this is exceeded, the switching member 46 is rotated and the bellcon valve 47 is switched.

Therefore, pressure oil flows into the bellcon cylinder 44 and moves the bellcon piston rod 41 in the direction of arrow (R). As a result, the belt 11 is strongly tensioned and the width of the split pulley 6 increases, resulting in the state shown by the imaginary line in FIG. 3, in which the input shaft 8 is transmitted at a reduced speed.

Due to such an effect, when the planting work machine 3 is raised and turned, the traveling speed is automatically reduced, making the turning work easier.

If the running speed during the turn is not appropriate (this varies depending on the driver's driving technique),
By operating the turnbuckle nut 50 of the speed adjusting means A and adjusting the length of the bellcon piston 41, the degree of deceleration can be adjusted.

[Brief explanation of drawings]

The figures show one embodiment of the present invention. Fig. 1 is a side view of the entire riding-type rice transplanter as an embodiment, Fig. 2 is a plan view thereof, and Fig. 3 is a side view of the main parts. , FIG. 4 is a side view of the hydraulic switching valve. Symbols in the figure: 1 is the running vehicle body, 2 is the lift mechanism, 3
indicates the working machine, and A indicates the speed adjustment means.

Claims (1)

[Claims] 1. The working machine 3 is attached to the traveling vehicle body 1 via a lift mechanism 2 so as to be movable up and down, and the traveling vehicle body 1 is mounted so that the traveling speed of the traveling vehicle body 1 becomes low when the working machine 3 rises to a certain height. Transmission gear for traveling and work equipment 3
In an agricultural working machine having a vehicle speed changing device provided with a linkage mechanism that links the raising of the working machine 3, the linkage mechanism includes an idle linkage means that does not change the running speed until the working machine 3 is raised to a certain height, and at least a low speed A traveling device for an agricultural working machine, characterized in that it is provided with a speed adjusting means A for adjusting the traveling speed of the side.