JPH0419206A - Working vehicle towing device in tractor - Google Patents

Abstract

PURPOSE:To prevent the inner wheel of a working vehicle from coming off or being stranded even at a narrow part so as to enable turning by connecting a draw bar to the frame of the working vehicle through two crossed traction rods, and moving a virtual traction point. CONSTITUTION:In the turning state, a tractor T and a working vehicle B are connected to each other by two traction rods 8a, 8b crossed at a virtual traction point, so that the respective horizontal distances L1, L2 from the rear wheels 4a, 4b of the tractor T and the wheels 5a, 5b of the working vehicle to the virtual traction point P are changed by the crossed axis angles of the respective centerlines C1, C2 of the tractor T and working vehicle B. When the crossed axis angles of the respective centerlines C1, C2 become specific angles, the respective horizontal distances L1, L2 become equal. In this state, the turning radius R1 of the inner wheel 4a of the tractor T becomes approximately equal to the turning radius R2 of the inner wheel 5a of the working vehicle B, and the locus of the inner wheel 4a of the tractor T becomes approximately equal to the locus of the inner wheel 5a of the working vehicle B.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a drawbar attached to the rear of a tractor;
The present invention relates to a towing device for a working vehicle in a tractor configured to connect the frame of the working vehicle with a towing rod to tow the working vehicle.

[Conventional technology]

As shown in FIG. 6, the conventional towing device having the above-mentioned configuration has a drawbar 2 between the free ends of a pair of lower links 1 constituting a link hitch mechanism A attached to the rear of a tractor T. Install this drawbar 2 and work vehicle B.
frame (not shown) - book or pine needle-like traction rod 3
The construction was such that the work vehicle B was towed via the towing rod 3. The intersection of the center line C1 of the tractor T and the center line C2 of the work vehicle B is the traction point P''.
In conventional traction devices, the position of the traction point P° relative to the tractor T and the work vehicle B remains unchanged regardless of their turning radii.

On the other hand, the turning radii of the rear wheels 4a, 4b of the tractor T and the wheels 5a, 5b of the working vehicle B are determined by the intersection angle of each center line CC2, the rear wheels 4a, 4b of the tractor T, and the wheels 5a of the working vehicle B. , 5b and each horizontal dark road ML' between the towing point P'
, , L''2.

Generally, the horizontal dark road RL'l between the rear wheels 4a, 4b of the tractor T and the towing point P is closer than the horizontal distance L°2 between the wheels 5a, 5b of the work vehicle B and the towing point P°. , the turning radius R3 of the inner ring 4a of the tractor T is smaller than that of the work vehicle B.
This is considerably larger than the turning radius R7 of the inner ring 5a.

As a result, when turning to enter or exit fields, buildings, etc.
Because the difference in turning radius between the inner ring 4a of the tractor T and the inner ring 5a of the work vehicle B is large, the road width required for turning becomes wider, and the inner ring 5a of the work vehicle B being towed may come off the wheel. In order to prevent this, the driver had to take into account the difference in turning radius when turning.

Further, in FIG. 6, 6a and 6b indicate the front wheels of the tractor T, and (rl) indicates the turning radius of the outer front wheel 6b of the tractor T. In order to turn the work vehicle B in the illustrated state, A road width of at least (r, -R2) is required.

[Problems to be Solved by the Invention] The present invention eliminates or reduces the difference in the turning radius between the inner wheels of the tractor and the working vehicle to make the trajectories of the inner wheels of the tractor and the working vehicle almost the same when turning. The objective of this project was to enable the work vehicle to turn even in narrow areas without causing the inner wheels of the work vehicle to fall off or run over.

[Means to solve the problem]

In order to solve the above problems, the means adopted by the present invention is to attach a drawbar between the free ends of a pair of lower links constituting a link hitch mechanism attached to the rear of a tractor, and to connect the drawbar to a working vehicle. In the traction device for a work vehicle in a tractor configured to connect the drawbar and the frame of the work vehicle with a traction rod to tow the work vehicle, the drawbar and the frame of the work vehicle are connected by two intersecting traction rods,
The virtual traction point was made to move.

[Action of the invention]

The drawbar attached to the rear of the tractor and the frame of the work vehicle are connected by two intersecting traction rods, so the virtual tow points, which are the intersections of the center lines of the tractor and the work vehicle, are Move according to the intersection angle of the center lines. Therefore,
When the intersection angles of the respective center lines reach a specific angle, the turning radii of the respective inner rings of the tractor and the work vehicle become approximately equal.

As a result, when turning, the trajectories of the inner wheels of the tractor and work vehicle can be made almost the same, making it easier to drive for turns and preventing the inner wheels of the work vehicle from coming off the wheels or running over them. The tractor and the work vehicle can be turned with the minimum road width without any trouble.

〔Example〕

Hereinafter, the present invention will be explained in more detail with reference to Examples.

Note that the same parts as those explained in the above "Prior Art" section are given the same reference numerals, and only the characteristic parts of the present invention will be explained to avoid redundant explanation.

In FIGS. 1 to 3, a drawbar 2 attached to the rear of a tractor T and a frame 7 of a working vehicle B are connected by two crossed traction rods 8a and Bb. Both ends of one of the traction rods 8b are bent so that the two traction rods 8a and 8b can cross each other without interfering with each other.

Further, as shown in FIG. 3, a connecting cylinder 9 is vertically fixed to both ends of each traction rod 8a8b, and this connecting cylinder 9 and the other connecting member 11 are vertically connected to each other. They are connected via 12. For this reason, the two traction rods 8a and 8b have a structure in which they can freely rotate within a horizontal plane around the connecting bin 12.

For this reason, 1. In the straight-ahead state shown in FIG. 1, if the center lines CC2 of the tractor T and the work vehicle B coincide, the virtual traction point P is located at the point where both the traction rods 8a and 8b intersect. In the turning state shown in FIG. 4, the virtual traction point P is the point where the centers kJi+c+, cz of the tractor T and the work vehicle B intersect. Since the tractor T and the work vehicle B are connected by the two crossed towing rods 8a8b, the rear wheels 4 of the tractor T
The horizontal distances L+, Lz between the virtual traction point P and the wheels 5a, 5b of the vehicle B and the wheels 5a, 4b of the vehicle B change depending on the intersection angle of the centers HCl+Cz of the tractor T and the vehicle B, respectively.

As shown in FIG. 5, when the intersection angles of the center lines C+ and Cx of the tractor T and the work vehicle B reach a specific angle, the above-mentioned horizontal distances become L! become equal. In this state, the turning radius R of the inner ring 4a of the tractor T
3 and the turning radius R2 of the inner ring 5a of the working vehicle B are approximately equal, and the locus of the inner ring 4a of the tractor T and the trajectory of the inner ring 5a of the working vehicle B are approximately the same. However, tractor T
When the respective wheel distances of the rear wheels 4a, 4b and the wheels 5a, 5b of the working vehicle B are different, a turning radius difference (Ro) corresponding to this travel distance difference occurs.

Therefore, it is no longer necessary to determine the portion through which the tractor T will pass by taking into account the difference in turning radius between the inner ring 4a of the tractor T and the inner ring 5a of the work vehicle B, and the width of the road that the tractor T can pass [in the illustrated example, (r+Rz ) width], it is possible to enter and exit fields, buildings, etc. without the inner wheels 5a of the work vehicle B falling off or running over the wheels.

〔Effect of the invention〕

According to the present invention, by connecting the tractor and the work vehicle through two intersecting traction rods, the turning radii of the inner wheels of the tractor and the work vehicle can be made approximately equal during turning.

As a result, when turning, the trajectories of the inner wheels of the tractor and work vehicle can be made almost the same, and unlike conventional
It is no longer necessary to take into account the difference in turning radius between the inner wheels of the tractor and the work vehicle to determine the area through which the tractor will pass, making it easier to drive for turns, and making it easier to drive the inner wheels of the work vehicle off the wheels or run over them. The tractor and the work vehicle can be turned with the minimum road width without having to do so.

[Brief explanation of drawings]

1 to 5 are diagrams for explaining the present invention, and FIG. 1 shows a tractor T driven by the traction device of the present invention.
FIG. 2 is a side view, FIG. 3 is a cross-sectional view of the support portions at both ends of the drag rods 8a and 8b, and FIG. FIG. 5 is a plan view of the tractor T and the working vehicle B in a state in which the inner wheels 4a5a of the tractor T and the working vehicle B are turning with substantially the same turning radius. FIG. 6 is a plan view of a state in which a tractor T and a work vehicle B, which are connected by a conventional traction device, are turning. The explanations of the symbols of the main parts constituting the present invention are as follows. A: Link hitch mechanism B: Work vehicle C'l: Center of tractor '1act: Center line of work vehicle T: Tractor P: Virtual traction point 1: Lower link 2: Drawbars 4a, 4b: ) Rear wheel of tractor

Claims (1)

[Claims] A drawbar is installed between the free ends of a pair of lower links constituting a link hitch mechanism attached to the rear of a tractor, and the drawbar and the frame of a work vehicle are connected by a towing rod. In the towing device for a working vehicle in a tractor configured to tow the working vehicle, the drawbar and the frame of the working vehicle are connected by two intersecting traction rods so that a virtual towing point moves. A towing device for a work vehicle on a tractor, characterized by: