JP3166184B2 - Powered vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power vehicle such as an agricultural work machine.

[0002]

2. Description of the Related Art Particularly in a farm work machine, it is advantageous to be able to adjust the tread of the wheels according to the spacing between the seedlings and the width of the ridges, and a powered vehicle capable of sliding the wheels along the center of the axle has been considered. .

[0003]

However, in the power vehicle having the above structure, the drive shaft of the wheels must be extended and contracted, and the structure of the axle support portion is complicated, and the operation of adjusting the tread is troublesome. There was a problem. Therefore,
An object of the present invention is to provide a powered vehicle whose structure is relatively simple and whose tread adjustment operation is easy.

[0004]

Means for Solving the Problems In order to solve the above problems, the present invention is configured as follows. That is, in the powered vehicle according to the present invention, in a powered vehicle provided with left and right wheels, the wheels are moved back and forth around the vertical axis in a non-steering state.
Be reversible, and the reversal
It is characterized in that the position of the wheel in the left-right direction is changed . In addition, the direction of rotation of the left and right wheels
Be provided with a forward / reverse switching device that can switch forward / reverse independently.
Keeps the same traveling direction even if the wheels are reversed
Can be

[0005]

The power vehicle according to the present invention can easily change the treads of the left and right wheels by reversing the wheels around the vertical axis, and can easily work in various working environments. can do.

[0006]

FIG. 1 is a view showing a use state of one embodiment of the present invention. A power plant 1 is equipped with a rice transplanting work machine 2 and a fertilizer application device 3, and is configured as a fertilizer rice transplanter as a whole.
The powered vehicle 1 is a four-wheeled vehicle including a pair of left and right front wheels 5L, 5R and rear wheels 6L, 6R. A transmission case 7 is disposed at a front portion of a body of the vehicle, and an engine 8 is provided behind the transmission case. A cockpit 11 is installed on an engine cover 10 that covers the engine 8, and a steering handle 12 is attached in front of the cockpit.

As shown in the power transmission system diagram of FIG. 2, a main clutch 16 is provided on an output shaft 15 of the engine 8, and the main clutch and the transmission case 7 are connected by a main transmission shaft 17. The engine output is also transmitted to the hydraulic pump 20 via the belt 19. The power that has entered the transmission case 7 is appropriately shifted by a hydraulic continuously variable transmission (HST) 22 and then separated into a front wheel drive output, a rear wheel drive output, and a work unit drive output. The front wheel drive output is taken out to the left and right front axles 24L and 24R by the front differential device 23, and the front wheel axle 24
The power is transmitted to the front wheels 5L and 5R via a transmission mechanism and the like in the left and right wheels 26R. Note that the function of the front differential device 23 may be released by the differential lock device 27 so that equal output is always transmitted to the left and right front wheels. Front axle 24
L, 24R are provided with forward / reverse switching devices 28L, 28R described later. The rear wheel drive output is from the side clutch 30
L, 30R, and is taken out to rear wheel output shafts 31L, 31R protruding from the rear part of the transmission case 7. The side clutch shaft 32 is provided with rear wheel brake devices 33L and 33R that operate independently of each other. When the rear wheel brake device is operated, the side clutch 30 (L, R) on the same side is interlocked with this. ) Is included. The forward / reverse switching device 34 is also provided on the rear wheel output shafts 31L and 31R.
L, 34R are interposed. These forward / reverse switching devices 2
8 (34) is configured as shown in FIG.
By switching the cylinder shaft 36 between the position indicated by the solid line and the position indicated by the chain line in 5, the rotation direction of the secondary shaft 24b (31b) with respect to the rotation direction of the primary shaft 24a (31a) is switched between forward rotation and reverse rotation. It has become. Rear wheel output shaft 31
L, 31R, the power taken out by the rear wheel transmission shaft 37L,
It is transmitted to the rear wheel support cases 38L, 38R via the 37R, and rotates the rear wheels 6L, 6R. The working unit drive output is
Via the safety clutch is transmitted to the planting clutch case 40, while being transmitted to the working machine 2 via the PTO shaft 41 from the clutch case with plants, transmission fertilization device 3 via the fertilizer driving rod 42, etc. Is done.

The front wheel support cases 26L, 26R and the rear wheel support cases 38L, 38R are provided to be rotatable about a vertical axis . When the steering handle 12 is rotated, the front wheel tie rods 44L, 44R are provided.
(44R not shown) and rear wheel tie rods 45L, 45R
(45R is not shown), these wheel support cases are turned, and the front wheels 5L, 5R and the rear wheels 6L, 6R are turned.
Is steered. The operation force applied to the steering handle 12 is amplified by the power steering device 46. Since the front wheel support case mounting portion and the rear wheel support case mounting portion have basically the same structure, the structure will be described next using the rear wheel support case mounting portion as an example.

[0009] Figure 4 is a front sectional view of the rear wheel-supporting case mounting unit 50 in the drawing is a rear case which is provided fixed to the frame (front cases the front wheel support case mounting unit),
An input shaft 51 connected to the rear wheel transmission shaft 37 and a vertical rear wheel support case mounting shaft 52 are supported on the rear case, and bevel gears 54, 55 mounted on both shafts 51, 52.
Are engaged with each other. The rear wheel support case has bearings 56 and 5
The lower part of the rear wheel support case mounting shaft 52 is inserted into the rear case 50 and rotatably held therein. A rear wheel axle 58 for mounting the rear wheel 6 is supported at a lower end portion of the rear wheel support case 38. The bevel gear 61, the rear wheel axle 58 from the rear wheel support case mounting shaft 52 to the rear wheel axle 58.
It is transmitted at 62. As shown in the figure, the position of the rear wheel 6 is shifted from the axis of the rear wheel support case mounting shaft 52.

Also, 65 (7 in the front wheel support case mounting portion)
1) is a steering member, to which the rear wheel tie rod 45 (the front wheel tie rod 44 in the front wheel support case mounting portion) is connected. The steering member 65 is attached to an upper end protruding portion of the rear wheel support case mounting shaft 52, and a lower end portion thereof is integrally formed on the outer peripheral surface of the rear wheel support case 38.
6B is removably connected to one of the bolts 6B. The screw holes 68A and 68B in which the bolts 67 are mounted are provided at positions on the rear wheel side and the opposite side of the rear wheel support case mounting shaft 52 that are 180 degrees from each other when viewed from the center. As shown by a solid line in FIG. 4, when the steering member 65 is connected to the locking convex portion 66A on the rear wheel side, the rear wheel 6 is located outside the rear wheel support case 38, and as shown by a chain line in FIG. Is connected to the locking convex portion 66B on the opposite side of the rear wheel, the rear wheel 6 is positioned inside the rear wheel support case. If the forward / reverse switching device 34 is set to “forward rotation” when the rear wheel 6 is provided at the outer position, the rear wheel 6
Is provided at the inner position, the forward / reverse switching device 34 is set to “reverse rotation”.
Switch to The same applies to the front wheel support case mounting part,
When the front wheel 5 is provided at an outer position, the forward / reverse switching device 28
Is set to "forward rotation", the forward / reverse switching device 28 is switched to "reverse rotation" when the front wheel 5 is provided at the inner position.

In FIG. 1, reference numeral 80 denotes a link device for mounting the working machine 2; a link frame 81 erected at the rear end of the power vehicle 1; and upper links 82, 82 rotatably supported by the link frame. And a lower link 83, 83, and a connecting frame 84 connected to the rear ends of these upper and lower links.
Is attached. By expanding and contracting the hydraulic cylinder 87 provided on the power vehicle 1, the connection frame 84 moves up and down while being held in a substantially constant posture, and the working machine 2 mounted thereon is moved up and down.

The work machine 2 includes a transmission case 90 also serving as a frame, planting devices 91 provided at the rear end of the transmission case (eight in the illustrated example), and the planting device. A seedling table 92 which is provided so as to be inclined so that the front side is positioned higher in front of the seedling table. The seedling table 92 reciprocates left and right, and the seedlings on the table are sequentially placed in a seedling removal outlet (not shown). At the same time, a pair of planting rods 91a, 91a of the planting device 91 perform up and down movements along a predetermined trajectory, sandwiching the seedling supplied to the seedling supply port, and planting it in the field. I have.

A center float 94 and a pair of left and right side floats 9
5,95 are provided. The center float 94 is also a sensor for detecting unevenness of the field, and the hydraulic cylinder 87 is operated based on the vertical movement of the center float 94. As shown in FIG. 9, a total of eight planting recesses 96 are formed at two places at the rear part of the center float 94 and three places at the rear end part of each side float 95 . .. Are set.
If the side floats 95 are formed widely as described above, the leveling property is good. For example, when the front and rear wheels are mounted at the outer positions, the wheels pass between the second and third planting positions 97 and 97 from the outside, and when mounted at the inner positions, the wheels are the third and fourth from the outside. Pass between the planting positions 97, 97.

At the time of work, the mounting positions of the front and rear wheels 5L, 5R, 6L, 6R are selected according to the conditions of the field. As shown in FIG. 5, when both the left and right wheels are mounted at outer positions, the interval width (tread) between the left and right wheels increases. to this
On the other hand, as shown in FIG.
When turned around 180 degrees and mounted together in the inner position, the tread becomes narrower. Also, as shown in FIGS. 7 and 8, when the left and right wheels are separately mounted at the outer position and the inner position, the wheels are biased to the left or right with respect to the aircraft, and work is performed on a headland or the like in a field. It will be convenient in the case.

FIG. 10 shows a steering control system according to a different embodiment (1 '). Steering handle 1
The operation force of No. 2 is transmitted to the gearbox 100 via the power steering device 46, and is taken out from the gearbox as front wheel steering operation force and rear wheel steering operation force. The front wheel steering operation force is controlled by the front cases 102L, 1R at the front wheel steering shafts 101L, 101R.
02R, the left and right front wheel supporting cases 26L, 26
Turn R. The front wheel support case 26 and the front case 102 are provided with a sensor 105 for detecting that the front wheel is directed straight. The rear wheel steering operation force passes through the rear wheel steering switching case 107,
Rear wheel steering transmission shaft 108 and rear wheel steering shaft 1
At 09L and 109R, the power is transmitted to the rear cases 50L and 50R to turn the left and right rear wheel support cases 38L 'and 38R'. The rear wheel support case 38 'and the rear case 50 are also provided with a sensor 112 for detecting that the rear wheel is oriented in the traveling direction.

[0016] The rear wheel steering switching device 107 includes:
For switching between a 2WS mode in which the rear wheels are not steered, a 4WS (normal) mode in which the rear wheels are steered in the same direction as the front wheels, and a 4WS (reverse) mode in which the rear wheels are steered in the opposite direction to the front wheels. The switching operation of these modes is performed by the mode switching lever 114. As shown in FIG. 11, there is provided a lever lock pin 116a which always projects so as to overlap the guide groove 115 of the switching lever 114, and which retreats when the solenoid 116 is excited. When the mode is switched, the button switch 118 attached to the top of the head is
The mode switching lever 114 is operated while pressing. First, the electromagnetic clutch 119 in the gear box 100 is disengaged, and the operating force of the steering handle 12 is cut off.
Next, the electromagnetic clutch 120 is engaged, and the motor 121 corrects the front wheels 5L and 5R and the rear wheels 6L and 6R so as to face the traveling direction. The sensors 105 and 112 detect that the rear wheel has turned in the traveling direction. Subsequently, the solenoid 116 is excited, and the mode switching lever 114 becomes movable. When the button switch 118 is returned after the mode switching lever 114 is moved to the desired mode position, the lever lock pin 115 projects again, and the mode switching lever 1
14 is locked.

As shown in FIG. 12, the rear wheel support case mounting portion has a bevel gear 123 fixedly mounted on an outer peripheral portion of a supported portion 38a 'of the rear wheel support case 38'.
A bevel gear 124 attached to the tip of the rear wheel steering shaft 108 meshes with this. The front wheel support case mounting portion has the same structure. As in the first embodiment, the powered vehicle 1 'can also selectively attach front wheels and rear wheels to an outer position and an inner position.

[0018]

As described above, according to the present invention, motor vehicle according to the present invention is a motor vehicle having left and right wheels, the non
During steering, the wheels are turned back and forth around the vertical axis.
By doing so, the position of the wheel in the left-right direction with respect to the fuselage
It is configured so that it can be changed.
Can easily change the trajectory of wheels and wheels,
Adaptability to changes in working conditions has improved.

[Brief description of the drawings]

FIG. 1 is an overall side view showing a use state of a powered vehicle according to one embodiment of the present invention.

FIG. 2 is a power transmission system diagram of the power vehicle shown in FIG.

FIG. 3 is a system diagram of a forward / reverse switching device.

FIG. 4 is a front sectional view of the rear wheel transmission case shown in FIG. 1;

FIG. 5 is a schematic diagram showing a state where both left and right front wheels and rear wheels are attached to outer positions.

FIG. 6 is a schematic diagram showing a state in which both left and right front wheels and rear wheels are attached to inner positions.

FIG. 7 is a schematic diagram showing a state in which a left front wheel and a rear wheel are attached to an outer position, and a right front wheel and a rear wheel are attached to an inner position.

FIG. 8 is a schematic diagram showing a state in which a left front wheel and a rear wheel are attached to an inner position, and a right front wheel and a rear wheel are attached to an outer position.

FIG. 9 is an explanatory view showing a shape of a float.

FIG. 10 is a steering transmission system diagram of a different embodiment.

FIG. 11 is a perspective view showing a mode switching lever and a peripheral portion thereof.

12 is a front sectional view of the rear wheel transmission case of the power vehicle shown in FIG. 10;

[Explanation of symbols]

 1, 1 'Powered vehicle 2 Work implement 5 Front wheel 6 Rear wheel 7 Transmission case 8 Engine 12 Steering handle 26, 26' Front wheel support case 30 Side clutch 33 Rear wheel brake device 38, 38 'Rear wheel support case

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Rihiki Seike 1st Hachikura, Tobe-cho, Iyo-gun, Ehime Prefecture Iseki Agricultural Machinery Co., Ltd. Engineering Department, Inc. (72) Inventor Hiroshi Suzuki 1 Engineering Department, Yasura Agricultural Machinery Co., Ltd. 1 Tobe-cho, Tobe-cho, Iyo-gun, Ehime Prefecture (56) References: Japanese Utility Model Sho 55-81523 (JP, U) (58) Field surveyed (Int.Cl. ⁷ , DB name) A01C 11/02 333 A01B 69/00 302 B60K 17/30 B62D 7/14

Claims (2)

(57) [Claims] 1. A powered vehicle having left and right wheels,
Flip the wheels around the vertical axis in the non-steering state
Enable and, by means of the reversal, the wheels concerned with respect to the fuselage
A power vehicle characterized in that the left-right position of the vehicle is changed . 2. The direction of rotation of the left and right wheels is positive independently of each other.
2. A forward / reverse switching device capable of reverse switching is provided.
A powered vehicle according to claim 1.