JPH0428562B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rolling lock device for a four-wheeled working vehicle, such as a riding rice transplanter, which has a working implement attached to its body and performs work while traveling.

[Conventional technology]

The front wheels of four-wheeled working vehicles, such as riding rice transplanters, used in fields, especially in paddy fields, are mounted on fixed axles to prevent them from rolling left and right, resulting in better straight-line performance. However, if the axle is fixed as described above, the steering wheel becomes difficult to turn when turning around the edge of a field or when driving on the road, resulting in reduced drivability.

Therefore, a rolling lock means as described in, for example, Japanese Utility Model Application No. 50-5312 has been proposed, but the locking member has a structure that is tightened with bolts, or a structure that lifts the locking member and fixes it by inserting a pin. It was hot.

[Problem to be solved by the invention]

If the locking member is tightened with bolts or lifted and fixed by inserting a pin as in the conventional structure described above, when the work vehicle is traveling, it is difficult to switch between the rolling lock state and the rolling possible state. I can't.

The present invention has been made to solve the above problems.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a four-wheel working vehicle in which left and right wheels are attached to an axle, and this axle is pivotally supported to the vehicle body so as to be able to roll. A locking means that can be switched between a locked state and a rolling enabled state is provided, and this locking means is
The present invention is characterized in that the vehicle is switched to a rolling state in conjunction with the operation of a turning operation means operated when the work vehicle turns.

[Effect]

With the above configuration, when driving straight in the field (during work), the axle is locked to prevent rolling from side to side, maintaining the desired straight movement, and when turning around at the edge of the field. Alternatively, when the vehicle is running on the road, the locking means is released to allow the axle to roll, thereby improving drivability.

〔Example〕

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings.

In the figure, reference numeral 1 denotes the body frame of the riding rice transplanter, and a pair of left and right rear wheel transmission cases 3 are installed rearwardly on both rear sides of a transmission case 2 that constitutes a part of the body frame. The transmission case 2 is provided in a planar portal shape, and a rear wheel 4 is attached to the rear end of each rear wheel transmission case 3. In addition, below the front of the above body frame,
A center pivot pin 5 is disposed in the center thereof by a bracket 6 so as to face in the front-rear direction, and the central upper part 8a of the final case 8 of the front axle 7 is pivotally connected to the pivot pin 5. has been done. A front wheel 10 is attached to the front axle 7 via a knuckle 9, and the front wheel 10 can be rotated by operating a handle 11 to change direction around the knuckle 9.

Also, under the seat 12, there is a defrock pedal 13.
is pivotally connected to the arm of the petal 13,
The inner wire of the control wire 14 is attached. The control wire 14 extends to the bracket 6, and its inner wire is connected to a lock pin 16 inserted into a pin hole 15 formed in the bracket 6. The lock pin 16 includes a flange 16a,
Due to the action of a compression coil spring 18 inserted between the flange 16a and a spring seat 17 provided on the bracket 6, the final case 8 is brought into elastic contact with the rear wall of the central upper part 8a. The final case 8 is provided with a lock pin hole 19 that faces the lock pin 16 when the front axle 7 is horizontally balanced with respect to the vehicle body frame 1.

In addition, in the figure, the reference numeral 20 is a lifting link mechanism in the shape of a parallelogram link that suspends the planting device 21 from the rear of the four-wheeled working vehicle, and 22 is a float provided at the bottom of the planting device 21. Reference numeral 23 indicates a seedling mounting stand equipped on the above-mentioned planting device 21, 24 indicates a planting body, and 25
is a spool type hydraulic control valve for float level sensing.

Further, the defrock petal 13 is used to operate the rear wheel defrock.
By loosening the inner wire 14, the lock pin 16 is biased by the spring 18, and the lock set state is established.

In such a configuration, when driving in the field, when operating the deflock pedal 13 to deflock the rear wheels (when driving straight), the control wire 14 is loosened, the spring 18 is activated, and the pin 1 is
6 toward the front axle. In this state, when the left and right sides of the front wheel 10 move up and down and the front axle 7 is left and right balanced with respect to the vehicle body frame 1, the pin 16 corresponds to the pin hole 19, and the spring 18 causes the pin hole 19 to into the locked state. For this reason, the front axle 7 does not roll left or right, so meandering of the front wheels 10 is avoided, and driving with good straightness is possible.

Also, when turning around in the field or driving on the road, when operating the differential lock pedal 13 to release the rear wheel differential, at the same time the inner wire of the control wire 14 is tensed, and the spring 1
Since the pin 16 is pulled back against the force 8, the pin 16 comes out of the pin hole 19, and the front axle 7 can freely roll. This allows for rounding operations at the edge of the field, climbing up or down from the field to the ridge, or from the ridge to the field,
Furthermore, there is no risk of one of the front wheels lifting off when driving on the road, and drivability is improved.

In another embodiment shown in FIGS. 4 to 6, the control wire 14 controlling the lock pin 16 is connected to a planting clutch lever 26, and the planting clutch lever 26 is moved to the "on" position. When this happens, the control wire 14 is loosened to bring the pin 16 into the lockset state. When the front axle 7 is in left-right balance with respect to the vehicle body frame 1, it engages with the pin hole 19. Further, when the planting clutch lever 26 is turned ``off'' in order to turn the machine at the edge of the field, the control wire 14 is tensioned, the pin 16 is unlocked, and the front axle 7 is placed in a rolling state.

In the above embodiment, the control wire 1 is connected to the differential lock pedal 13 for rear wheel differential lock or the planting clutch lever 26.
4 to set the lock set timing of the lock pin 16, but when the hydraulic lever of the hydraulic cylinder that operates the lifting link mechanism 20 is connected and the hydraulic lever is set to ``down'', the pin 16 is set to lock set. It may be configured in an interlocking relationship such that the state is changed.

Further, in the above embodiment, the pin 16 is inserted into the pin hole 19.
Although the rolling lock of the front axle 7 has been achieved by inserting the front axle into the front axle, it is also possible to lock the front axle with a lever type device, as in yet another embodiment shown in FIGS. 7 and 8. In this case, a stopper 27 is provided on the bracket 6 corresponding to one side of the center pivot pin 5, a Z-shaped lever 28 is pivotally mounted on the opposite side, and the lever 27 is connected to the control wire 14 via a tension spring 29.
It is connected to the inner wire of the The relationship is such that a lock set state is created when the inner wire is under tension. At this time, when the inner wire is tensioned, the lever 28 only brings the tip of the lock into elastic contact with the final case 8, but when the lever 28 reaches the state shown in FIG. 8, it is in the locked state.

〔Effect of the invention〕

As explained above, according to the rolling lock device for a four-wheeled working vehicle of the present invention, when traveling straight in a field, the axle can be locked to improve straight traveling performance, and also, when traveling straight at the edge of the field, it is possible to lock the axle. When turning, crossing ridges, driving on the road, etc., the lock can be released to improve maneuverability, and the axle can be rolled in conjunction with the operation of the turning operation means operated when turning while the four-wheeled work vehicle is running. Therefore, an excellent effect can be obtained in that the rolling lock can be automatically locked and released while the four-wheeled work vehicle is in operation.

[Brief explanation of drawings]

Figure 1 is a side view showing one embodiment of the present invention, Figure 2 is a side view showing one embodiment of the present invention;
The figure is a front view of the same main part, Figure 3 is a side view of the same main part,
4 is a side view of another embodiment, FIG. 5 is a front view of the same main part, FIG. 6 is a side view of the same main part, and FIG. 7 is a side view of the main part of still another embodiment, FIG. 8 is a side view of the same main part in a locked state. 1... Vehicle body frame, 2... Mission case, 3... Rear wheel transmission case, 4... Rear wheel, 5...
...Center pivot pin, 6...Bracket, 7...
...Front axle, 8...Final case,
8a...Central top, 9...Natsukuru, 10...Front wheel, 11...Handle, 12...Seat, 13...
...Diff lock petal, 14...Control wire, 15...Pin hole, 16...Lock pin, 16
a...Flange, 17...Spring seat, 18...
...Spring, 19...Lock pin hole, 20...
Lifting link mechanism, 21... Planting device, 22... Float, 23... Seedling mounting stand, 24... Planting body, 2
5... Valve, 26... Planting clutch lever, 2
7...stopper, 28...lever, 29...tension spring.

Claims (1)

[Claims] 1. In a four-wheeled working vehicle in which left and right wheels are attached to an axle, and this axle is pivotally supported to the vehicle body so as to be able to roll, the above-mentioned rolling can be made into a rolling lock state and rolling while the working vehicle is running. A four-wheeled working vehicle characterized in that the locking means is provided with a locking means that can be switched to a rolling state, and the locking means is switched to a rolling possible state in conjunction with the operation of a turning operation means operated when the working vehicle turns. Rolling lock device.