JP2001130436A - Steering device for harvester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steering device capable of synchronously operating even when a wheel seesaw motion exists in a four-wheel support type harvester. SOLUTION: Steering heads 19, 20 are pivoted by a vertical shaft 23 to the front and rear ends of steering frames 10, 11 annexed along an advance direction. The tips of front and rear piston rods 17, 18 of both rod cylinders 16 each fitted to steering frames 10, 11 are connected to a lower arm 22 of the front and rear steering heads 19, 20 at a position of an equal turning radius. Left and right hydraulic hoses 47, 48, the front end parts of which are connected to a hydraulic pump A of a tractor, are connected to a two position switching valve 50. The terminal part of the hoses 47, 48 are connected to the pressure oil inlet/outlet ports of the front end parts of the left and right both rod cylinders 16 respectively. The pressure oil inlet/outlet ports of the rear end parts of the left and right both rod cylinders 16 are communicated by a hydraulic hose 49.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steering device for a harvester having two wheels, one on the left and one on the right, which are arranged in series.

[0002]

2. Description of the Related Art As a harvester, a two-row beet harvester shown in FIGS. 7 and 8 (see Japanese Patent Application Laid-Open No. H11-225526) is known. Hereinafter, in the description of this harvester, the left and right are displayed as viewed in the forward direction F arrow.

In FIG. 7 and FIG. 8, reference numeral 51 denotes the two-row beat harvester, which is provided below a bogie frame 53 provided with a hitch bar 52 at the front thereof, from the front to the back, from a front to a back.
55, an ascending conveyor 56, and a post-conveyor 57
An elevating bucket conveyor 58 is provided upright at the rear end of the bogie frame 53 so as to surround the rear conveyor 57. The lifting bucket conveyor 58 is configured to transfer a beat falling at an intermediate portion of the post-conveyor 57 to the pre-conveyor 59 during the ascent.

A beat tank 60 with an unloading device for temporarily storing beats falling from the front end of the forward conveyor 59 is placed on the upper surface of the front half of the bogie frame 53. The bogie frame 53 includes a right front wheel 28, a right rear wheel 29, a left front wheel 30, and a left rear wheel 31 on the right and left sides of the rear half, respectively.
Are connected in series.

[0005] Referring to FIG. 9, reference numeral 5 denotes a truck axel. A wheel adjusting shaft 6 is attached to both ends so as to be able to move back and forth, and is fixed by pins 9. An upper surface of a vertical plate 8 erected on a support plate 7 fixed to an upper surface of the trolley axel 5 is fixed to a lower surface of the trolley frame 53. 10,
Numeral 11 denotes a steering frame, and a bearing 12 provided at a central portion in a longitudinal direction supports a terminal portion of the wheel adjusting shaft 6 and is disposed along the forward direction. Steering frames 10 and 1
Reference numeral 1 denotes a symmetrical shape with respect to the trolley axel 5, both ends are bent outward, and bearings 34 and 35 are provided at the outer ends.

Reference numeral 13 denotes a bogie axel stopper, which is fixed to both end surfaces of the wheel adjusting shaft 6 with set screws 14 and whose inner surface is in sliding contact with the outer surface of the bearing 12 to stop the bogie axel 5 from moving left and right. . Reference numeral 15 denotes a collar fixed to the wheel adjusting shaft 6, which stops the inward movement of the steering frames 10, 11.

FIG. 10 is a partially cutaway plan view of a steering device of the two-row beet harvester 51. In FIG. 10, steering heads 61 and 62 are respectively attached to the front end and the rear end of the steering frames 10 and 11 by the vertical axis 23.
At the bearings 34 and 35 described above. As shown in FIG. 11, the steering head 61 is formed in a U-shape, and has a side arm 66 projecting rearward from the lower arm 64.
The steering head 62 is formed in a U-shape as shown in FIG.

[0008] The steering heads 61 and 62 include a standing plate 65.
A wheel shaft 27 protrudes from the center of the rear rear surface at right angles to the standing plate portion 26. The wheel axle 27 protrudes from the central portion, the upper portion, or the lower portion of the standing plate portion 26 at a predetermined position, and
The rim 81 is fitted in a wheel boss 80 fixed to the center of the rim 81 to rotatably support the left front wheel 30. The right front wheel 28, the right rear wheel 29, and the left rear wheel 31 are similarly mounted on the wheel shaft 27.

The upper arm 63 and the lower arm 64 of the steering head 61 and the upper arm 6 of the steering head 62
At the base of the lower arm 68 and the lower arm 68, there is provided a hole 69 through which the longitudinal axis 23 communicates, at the tip of the upper arm 63 a hole 71 and a hole 70 at the middle, and also at the tip of the side arm 66.
Is provided. Upper arm 63, 67, side arm 6
In 6, the center intervals between the holes 69 and 70 are all the same.

[0010] The left and right steering heads 61 are provided between the upper arm 63 and the lower arm 64.
1 is inserted, the longitudinal axis 23 communicates with the hole 69 and the bearing 34 (see FIG. 9), and is pivotally attached to the front ends of the steering frames 10 and 11. The vertical axis 23 is screwed with a nut 24 as a stopper to prevent the screw from protruding downward from the lower arm 64. Similarly, the left and right steering heads 62 are attached to the rear ends of the steering frames 10 and 11 in the bearings 35 (see FIG. 9), the holes 69 of the upper arm 67 and the lower arm 69 so as to be pivotable on the longitudinal axis 23 respectively. Have been. When the steering head 61 turns, the holes 70 and 71 are closer to the vertical axis 23 than before the turning, so that the holes 70 and 71 are elongated holes on the center line of the holes 70 and 71 toward the vertical axis 23.

Reference numeral 73 denotes a double-acting hydraulic cylinder, whose base end is connected to a bracket 72 projecting from the inner surface of the steering frame 11 with a pin 74. Then, the right front wheel 28, the right rear wheel 29, the left front wheel 30, and the left rear wheel 31 are aligned in the straight traveling direction, the piston rod 75 of the double-acting hydraulic cylinder 73 is set to the intermediate position, and the tip of the piston rod is steered to the left. The pin is connected to a hole 71 of an upper arm 63 of the pin 61. The double-acting hydraulic cylinder 73 receives hydraulic pressure from a towing tractor of the harvester with a hydraulic hose (not shown), and extends and retracts a piston rod 75 with a directional control valve.

Reference numeral 77 denotes a vertical tie rod, and the left front wheel 3
0, the left rear wheel 31 is moved in the straight running direction, and tie rod ends 79 at both ends are pivotally attached to the upper arm 63 of the steering head 61 and the hole 70 of the upper arm 67 of the steering head 62, respectively. And the vertical axis 23 form a parallel link. Similarly, the right front wheel 28 and the right rear wheel 29 are aligned in the straight traveling direction, and both ends of the vertical tie rod 77 are connected to the upper arm 63 of the right steering head 61 and the upper arm 67 of the steering head 62, and are parallel to each other. Form a link. Reference numeral 78 denotes a horizontal tie rod, both ends of which are connected to holes 70 at the tip of the side arm 66 of the left and right steering heads 61, and form a parallel link with the left and right side arms 66 by the vertical axis 23.

FIG. 13 is a schematic plan view showing a left steering operation of the steering system shown in FIG. That is,
When the piston rod 75 of the double-acting hydraulic cylinder 73 is extended, the upper arm 63 of the left steering head 61 turns left around the longitudinal axis 23, and the left front wheel 30 turns left.
At the same time, the side arm 66 turns left, and this turning causes the side arm 66 of the right steering head 61 to turn left by the horizontal tie rod 78, and changes the direction of the right wheel 28 to the left. Since the turning radii of the side arms 66 of the left and right steering heads 61 are the same, the left front wheel 30 and the right front wheel 28 have the same steering angle.

The left turning of the left steering head 61 is carried out by the vertical tie rod 77.
Is turned to the left, and the direction of the left rear wheel 31 is changed to the left. At this time, the upper arm 63 of the steering head 61 and the hole 69 of the upper arm 67 of the steering head 62
And 70 have the same center distance, so that the left rear wheel 31 is the left front wheel 3
It becomes the same left steering angle as 0. Similarly, the left turning of the right steering head 61 causes the right steering head 62 to turn left by the vertical tie rod 77, and the right front wheel 28
And the right rear wheel 29 is turned to the same steering angle. That is, right front wheel 28, right rear wheel 29, left front wheel 30, left rear wheel 31
Turns left at the same angle.

FIG. 14 is a schematic plan view showing the right steering operation of the steering apparatus shown in FIG. 10. When the piston rod 75 of the double-acting hydraulic cylinder 73 is retracted, the upper arm 63 of the left steering head 61 moves vertically. The vehicle turns right around 23, and the left front wheel 30 turns rightward. The right turning of the left steering head 61 is performed by turning the right steering head 61 rightward via the horizontal tie rod 78 to turn the right front wheel 28 to the right at the same steering angle as the left front wheel 30.

When the left steering head 61 is turned to the right, the left steering head 62 is turned right by the vertical tie rod 77 so that the left rear wheel 31 is oriented rightward at the same angle as the left front wheel 30. The right turning of the right steering head 61 is performed by turning the right steering head 62 rightward by the vertical tie rod 77, and the right rear wheel 29 is turned rightward at the same angle as the right front wheel 28. The above-described left and right steering angles change when the amount of piston rod 75 retreats is adjusted by the amount of pressurized oil supplied to the double-acting hydraulic cylinder 73.

[0017]

In the conventional steering apparatus described above, the left front steering head 61 is turned by the extension and retraction of the piston rod 75 of the double-acting hydraulic cylinder 73, and this turning is performed by the aforementioned parallel link. By transmitting to the left and right steering heads 61 and 62, the front and rear and left and right wheels are synchronized and changed in direction.

Although the above configuration has no problem on a flat ground, when the left front wheel 30 rises or falls, the horizontal tie rod 7
8 is oblique, and the turning of the left steering head 61 and the turning of the right steering head 61 are not synchronized. Further, the horizontal tie rod 78 has a drawback that when the degree of the tie rod 78 becomes large, an excessive force is applied to both ends and the tie rod 78 is broken. SUMMARY OF THE INVENTION In view of the above problems and disadvantages, an object of the present invention is to provide a steering device in a harvester in which the steering operation is synchronized even when the wheels are largely moved up and down.

[0019]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and drawbacks, the present invention relates to a harvesting machine having a left and right steering frame along a forward direction below a bogie frame. The arm, the upright portion, and the lower arm are formed in a U-shape, and a wheel shaft is provided at a predetermined position on the outer surface of the upright portion so as to project at right angles. This steering head is attached to the front and rear ends of the left and right steering frames so as to be pivotable about the vertical axis, and the front and rear piston rod tips of both rod cylinders attached to the left and right steering frames, respectively. Connect to the lower arm of the head at a position where the turning radius is equal. Then, the left and right hydraulic hoses connected to the hydraulic pump of the towing tractor via a two-position switching valve are respectively connected to the pressure oil ports at the front ends of the left and right rod cylinders, and the pressure oil at the rear ends of the left and right rod cylinders are connected. The entrance and exit were connected by a hydraulic hose to provide a steering device for the harvester.

In addition, the front and rear ends of the piston rods of the two rod cylinders may be connected to the upper arm of the steering head at a position having an equal turning radius. In addition, a tie rod having an adjustable length can be connected.

[0021]

DETAILED DESCRIPTION OF THE INVENTION The present invention utilizes the fact that both rod cylinders retract the rear piston rod by an amount corresponding to the front piston rod extension or vice versa. Things. That is, the steering heads are pivotally attached to the front and rear ends of the steering frames provided along the forward and left sides under the bogie frame, and the front and rear piston rod tips of both rod cylinders attached to the left and right steering frames. The parts are connected to the left and right front and rear steering heads at positions having the same turning radius.

A hydraulic circuit in which the left and right rod cylinders are operated forward and backward by the hydraulic pressure supplied from the towing tractor of the harvester to the left and right rod cylinders via the two-position switching valve. The steering device is formed so that the left and right front and rear wheels are synchronized and the direction is changed left and right.

[0023]

Next, an embodiment will be described with reference to the drawings. In the following, the same components as those of the conventional technology described above use the same reference numerals, and the left and right are the display as viewed in the forward direction F.

In FIG. 1 and FIG. 2, a truck frame 4 of the harvester connects a hitch bar 3 provided on a front surface to a draw bar 2 of a tractor 1 and tow with the tractor.
The trolley axel 5, wheel adjusting shaft 6, support plate 7, pin 9, steering frames 10, 11, bearing 12, trolley axel stopper 13, set screw 14, and collar 15 are already shown in FIG.
This is the same as that described above.

Referring also to FIG. 3, reference numeral 16 denotes a double-acting double rod cylinder, which is fixed with bolts and nuts to brackets 32, 32 fixed on the lower surfaces of the steering frames 10, 11 with the upper flanges 33, 33. It is attached to the center of the back surface of the steering frames 10 and 11. The front and rear piston rods 17 and 18 of the two rod cylinders 16 are connected at their distal ends to one end of a connecting piece 38 by a pin 40.
A tie rod 42 is screwed onto the tip of
It is fixed at 3.

Reference numeral 39 denotes an L-shaped piece fixed to one end of the connecting piece 38, which faces the front end faces of the front and rear piston rods 17 and 18 via the play 41, and the connecting piece 38 You can turn around. Tie rod 4
2, the length can be adjusted by loosening the lock nut 43. 44 is a tie rod end, and 45 is a known pole stud. Reference numeral 46 denotes a grooved nut for inserting and fixing the pole stud 45 into the hole 37 of the lower arm 22.

Reference numerals 19 and 20 denote steering heads having the same shape. As shown in FIG.
The lower arm 22 is formed in a U-shape, and a wheel shaft 27 is provided at a predetermined position on the back surface of the upright plate portion 26 so as to project perpendicularly to the upright plate portion 26. The predetermined position may be determined at any one of the central portion, the upper portion, and the lower portion of the standing plate portion 26. 2, a front right wheel 28, a rear right wheel 29, a front left wheel 30, and a rear left wheel 31 are rotatably mounted on the wheel shaft 27. Steering head 1
Holes 36, 36 communicating the longitudinal axis 23 are provided at the roots of the upper arm 21 and the lower arm 22 of 9 and 20. As in FIG. 9, the steering frames 10 and 11 are provided with bearings 34 and 35 at the front and rear ends, respectively, through which the longitudinal axis 23 is inserted.

The steering heads 19 and 20 are provided between the upper arm 21 and the lower arm 22.
The front and rear ends of 0 and 11 are inserted, the longitudinal axis 23 is communicated with the hole 36 and the bearings 34 and 35, and the front and rear ends of the steering frames 10 and 11 are pivotally mounted. . The nut 24 is a stopper for the vertical axis 23 (see FIG. 3).

FIG. 4 is a left inner side view of a main part of another embodiment with a part cut away, in which both rod cylinders 16 are mounted on the upper surface of the steering frame 10. In this case, the steering heads 19 and 20 are turned upside down from the case of FIG. 3 and are supported on the front and rear ends of the steering frame 10 by the vertical axis 23. Accordingly, the upper arm 25 is the lower arm 22 in the steering heads 19, 20 in FIG.
Brackets 32, 32 are fixed to the left and right of the center of the upper surface of the steering frame 10, and the flanges 33, 33 of both rod cylinders 16 are fixed to the upper surfaces of the brackets 32, 32 with bolts and nuts. Front and rear piston rods 17,
The tie rod 42 at the distal end of the upper arm 2
5 is connected to the tip portion at a position where the turning radius is equal.

Referring to FIG. 1 and FIG. 2, the right two rod cylinders 16 are connected to the rear end of the hydraulic hose 47 at the pressure oil port at the front end, and are connected to the left rod cylinder 1 at the left.
Numeral 6 connects the rear end of the hydraulic hose 48 to the pressure oil port at the front end. The left and right rod cylinders 16 have a hydraulic hose 49 communicating with the pressure oil inlet / outlet at the rear end. The hydraulic hoses 47 and 48 have an intermediate portion connected to the two-position switching valve 50 and a front end connected to the hydraulic pump A of the towing tractor 1. The two-position switching valve 50 (hereinafter, abbreviated as a switching valve) uses an electromagnetic valve. The switching valve 50 is placed near the driver's seat of the towing tractor so that the driver can easily operate it.

FIG. 5 is a plan view of a main part of the device of the present invention when steering leftward. In FIG. 5, when the pressure oil from the hydraulic pump A is switched to the hydraulic hose 47 by the switching valve 50 and sent to the front ends of the two rod cylinders 16 on the right side, the pressure oil
A hydraulic circuit (arrows a → b →) which flows into the rear ends of both rod cylinders 16 on the left through the line 9 and returns from the hydraulic oil inlet / outlet at the front end to the hydraulic pump A via the hydraulic hose 48 via the switching valve 50.
c and the circuit through which the pressure oil flows).

By the flow of the pressurized oil, the front piston rods 17 of the right rod cylinders 16 are retracted and the rear piston rods 18 are extended, so that the lower arms 22 of the right steering heads 19 and 20 move to the vertical axis 23. (See FIG. 2) The vehicle turns to the left and the right front wheel 28 and the right rear wheel 29 turn to the left at the same angle. Left double cylinder 16
The front piston rod 17 is extended by the pressure oil supplied to the pressure oil port at the rear end by the hydraulic hose 49, and the rear piston rod 18 is retracted. Due to this extension and retraction, the lower arms 22 of the left steering heads 19 and 20 make a left turn around the longitudinal axis 23, and the left front wheel 30 and the left rear wheel 31 change directions at the same angle to the left.

At this time, since the front and rear piston rods 17 and 18 of the right and left rod cylinders 16 have the same amount of extension and retraction, the left and right front wheels 30, 28 and the rear wheels 31, 29 are at the same angle to the left. The direction changes and the harvester steers to the left. FIG. 6 is a plan view of a main part at the time of rightward steering. In this case, the pressure oil is first supplied to the left rod cylinders 16 by the switching valve 50 and then to the right rod cylinders 16.
The pressure oil flows in the order of d → e → f, which is the reverse of the case of FIG.

In FIG. 6, both left rod cylinders 16
Of the front piston rods 17 and the extension of the rear piston rods 18, the left steering heads 19, 20
Of the lower arm 22 turns right, and the left front wheel 30 and the left rear wheel 31
Turns to the right at the same angle. In the two rod cylinders 16 on the right side, the front piston rod 17 extends and the rear piston rod 18 retracts. Due to this extension and contraction, the lower arms 22 of the right steering heads 19 and 20 are formed.
Turns right, and the right front wheel 28 and the right rear wheel 31 turn rightward at the same angle. Both left and right rod cylinders 16
Since the front piston rod 17 and the rear piston rod 18 have the same amount of extension and contraction, the left and right wheels turn in the same direction.

When both rod cylinders 16 are mounted on the surfaces of the steering frames 10 and 11 as shown in FIG. 4, the left and right turns can be performed by hydraulic pressure from the towing tractor in the same manner as in FIGS. Will be The steering angle is adjusted according to the amount of oil supplied to both rod cylinders 16. Further, when the switching valve is stopped by directing the wheels in the straight traveling direction, the vehicle enters a straight steering state.

[0036]

According to the steering apparatus of the present invention, a steering frame is provided along both ends of a bogie axel crossing below a bogie frame along a forward direction, and the steering head is pivotally supported at the front and rear ends of the steering frame. Are connected to the front and rear piston rods of both rod cylinders attached to the steering frame, and the front and rear piston rods of the left and right rod cylinders are hydraulically operated in reverse. You can turn right and left in synchronization.

Since the steering operation is performed by the hydraulic operation of the left and right rod cylinders, the horizontal and vertical tie rods in the conventional steering device are not required, so that the number of parts of the steering device is reduced, and the configuration is reduced. Can be simplified. Further, since the left and right rod cylinders and the steering head are provided independently of each other on the left and right steering frames, the steering operation can be synchronized irrespective of whether the left and right and front and rear wheels move up and down due to unevenness of the field.

Further, since the two-position switching valve is provided in the hydraulic hose received from the towing tractor to the left and right rod cylinders, the supply of the hydraulic pressure to both the left and right rod cylinders can be easily switched so that the left and right turning can be steered. it can. When the tie rods are connected to the front end portions of the front and rear piston rods of the left and right rod cylinders and connected to the steering head, the turning operation of the steering head can be finely adjusted by adjusting the length of the tie rods.

[Brief description of the drawings]

FIG. 1 is a partially broken plan view in which a bogie frame provided with the device of the present invention is connected to a tractor.

FIG. 2 is a plan view in which a part of the device of the present invention is omitted.

FIG. 3 is an exploded perspective view of a main part of the device of the present invention.

FIG. 4 is a left inner side view of a main part of a partially broken part showing another embodiment of the device of the present invention.

FIG. 5 is a plan view of a main part of the device of the present invention when steering leftward.

FIG. 6 is a plan view of a main part of the device of the present invention at the time of rightward steering.

FIG. 7 is a right side view showing an example of a two-row beet harvester.

FIG. 8 is a plan view of FIG. 7;

FIG. 9 is a perspective view of a main part of a rear part of FIG. 8;

FIG. 10 is a partially cutaway plan view of the steering device in FIG. 8;

FIG. 11 is an exploded perspective view of a part of FIG.

FIG. 12 is a perspective view of one component in FIG. 10;

FIG. 13 is a schematic plan view showing a left steering operation of the conventional steering apparatus.

FIG. 14 is a schematic plan view showing a right steering operation of a conventional steering device.

[Explanation of symbols]

 4 Bogie frame 5 Bogie axel 10 Steering frame 11 Steering frame 16 Double rod cylinder 17 Front piston rod 18 Rear piston rod 19 Steering head 20 Steering head 21 Upper arm 22 Lower arm 23 Vertical axis 25 Upper arm 26 Standing plate 27 Wheel axle 32 Bracket 33 Flange 34 Bearing 35 Bearing 38 Connecting piece 42 Tie rod 47, 48, 49 Hydraulic hose 50 2-position switching valve A Hydraulic pump for towing tractor

Claims (3)

[Claims] 1. A harvester in which a steering frame is provided below a bogie frame in a left and right direction along a forward direction, an upper arm, an upright portion, and a lower arm are formed in a U-shape, and a predetermined outer surface of the upright portion Steering heads with wheel shafts protruding at the right and left sides of the steering frame are attached to the front and rear ends so as to be pivotable about the vertical axis, respectively, and the front and rear parts of both rod cylinders attached to the left and right steering frames respectively. The front end of the piston rod is connected to the lower arm of the steering head at a position where the turning radius is equal, and the left and right hydraulic hoses connected to the hydraulic pump of the towing tractor via a two-position switching valve are connected to the front ends of the left and right rod cylinders. A steering device for a harvester that is connected to the pressure oil inlet and outlet and connects the hydraulic oil inlets at the rear ends of both left and right rod cylinders with hydraulic hoses. 2. The front and rear piston rod tips of both rod cylinders are connected to the upper arm of the steering head at the front and rear ends of the left and right steering frames at the same turning radius. Steering device in harvester. 3. The steering apparatus according to claim 1, wherein the front and rear piston rods of the two rod cylinders have tie rods having adjustable lengths connected to their distal ends.