JPS61232926A - Agricultural traveling vehicle - Google Patents

Abstract

PURPOSE:To improve both traveling property and operating property by providing a center differential device through which a proper rotary driving force is transmitted to both front and rear axles in accordance with a load applied to said front and rear axles. CONSTITUTION:A center differential device and a front wheel differential device 41 are housed in the central parts of a center differential case 14 and a front axle housing 17 respectively. The turning force of an output shaft 12 is reduced to a certain reduction gear ration by varying the combination of gears meshed with the output shaft 12 and intermediate shafts 34, 35, and transmitted to the center differential device 40. The center differential device 40 has a lock device 54 which stops differentiating function and transmits an equal amount of rotation driving force to shafts 49, 49'. The lock device 54 consists of a lock pawl receiver 54a and a lock pawl 54b which is engaged with the lock pawl receiver 54a, and a lock member 54c which is slidably fitted to the shaft 49'.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an agricultural vehicle for towing agricultural work equipment such as rice transplanting equipment.

(Prior Art) There is an all-wheel drive agricultural working machine in which rotational power is transmitted from the prime mover side to both a front wheel drive shaft and a rear wheel drive shaft.

(Problem to be solved by the invention) In this type of agricultural vehicle, if the ratio of the drive rotation speeds transmitted to the front and rear axles remains constant, the propulsive force of the rear wheels is greater than the traction force of the front wheels when turning. Since the steering wheel becomes larger, there are problems in that it is difficult to operate the steering wheel and the turning diameter becomes larger than necessary. (Means for solving the problems) The agricultural vehicle according to the present invention power is transmitted to the front wheels and rear wheels via the first differential device, that is, the center differential device, and the power transmitted to the front wheels is transmitted to the left and right wheels via the second differential device, that is, the front wheel differential device. The power transmitted to the front wheels of the vehicle is transmitted to the front wheels, and the power transmitted to the rear wheels is transmitted to the left and right rear wheels via side clutches.

(Function) When the vehicle turns on the road, the load on the rear wheels increases, so the center differential device operates, and appropriate rotational driving force is transmitted to the front axle and rear axle.

(Example) FIG. 1 is a side view of an example of an agricultural vehicle according to the present invention;
and FIG. 2 is a plan view with the upper cover removed. This agricultural vehicle 1 has frames 2a and 2b that constitute a framework 2, and an engine room 4 that also serves as a seat base and a control platform 5 are provided on the upper part of the framework 2. A cockpit 7 is installed above the engine room 4, and an operation/X handle 8 and the like are installed above the cockpit 5.

The engine IO is mounted horizontally inside the engine compartment 4. An output shaft 12 is mounted from the engine 10 to a mission case 11 provided at the lower front part of the frame. A center differential case 14 is vertically disposed below the transmission case 11, and a front axle housing 17.17 is provided behind the center differential case 14.
extends in the left-right direction, and a front wheel 18.1 is installed at both ends of this front axle housing 17.17 and at a lower end thereof.
A front wheel support case 19, 113, to which the front wheel 8 is attached, is provided so as to be able to change direction. Further, a propeller shaft 21 is taken out rearward from the lower end of the center differential case 14, and its rear end penetrates into the center of the rear axle housing 22. The rear axle housing 22 has gear cases 23 and 23 at both ends.
A rear wheel 24, 24 is pivotally supported at the lower end of the wheels 3 and 23.

Furthermore, a parallel link device 2B for connecting a working device is provided at the rear end of the frame 2. This parallel link device 2
B includes a frame (not shown), one upper link 27 and two wooden lower links 28 and 28 supported by the frame, and a connecting frame 29 attached to the rear end of the upper and lower links.
0 working device consisting of ° connecting tool 2fla of connecting frame 28
will be installed on the A piston rod of a hydraulic cylinder 32 pivotally connected to the frame 2a is connected to the tip of an arm 31 fixed to the upper link 27. By extending this hydraulic cylinder 32, the parallel link device 2B is swung upward.

The structure of the front axle of this agricultural vehicle is the third
It is hailed by a diagram. That is, the transmission case 11 has an output shaft 1 equipped with a plurality of transmission gear arrays therein.
2 and an intermediate shaft 34.35, and a center differential case 1
4 and the center portion of the front axle housing 17 are respectively provided with first and second differential devices, that is, a center differential device 40.
and a front wheel differential device 41 are housed therein. The rotational force of the output shaft 12 is appropriately reduced to a predetermined reduction ratio by changing the combination of gears that mesh with each other on the output shaft 12 and the intermediate shafts 34 and 35, and then transmitted to the center differential device 40.

The center differential device 40 is provided with a bevel gear 46 perpendicular to the central axis of the container 45 in a valley-shaped container 45 whose outer surface part 45a is formed as a gear, and further meshes with the second gear 46. A pair of secondary gears 47,4? 'The container 45
It is provided on the central axis of. The center differential device 40 is arranged such that both ends of a container 45 are supported by the center differential case 14 by bearings 48, 48', and a gear portion 45a of the container is disposed.
is meshed with the gear 50 of the intermediate shaft 35, and shafts 48 and 48' are fitted into the secondary bevel gears 47 and 47', respectively. One shaft 49 is fitted into the front wheel differential case 15, and a gear 51 is attached to its tip. other axis 4
3' is connected to the propeller shaft 2 via spur gears 52 and 53.
Connected to 1.

This center differential device 40 stops the differential function and
9.41' is provided with a locking device 54 for transmitting the same amount of rotational driving force. The locking device 54 includes a locking claw receiver 54a formed at the end of the container 45, and a locking claw 54b that engages with the locking claw receiver 54a.
It consists of a locking tool 54c that is slidably fitted to the holder 8'. The locking tool 54c is constantly urged by a spring 54d in a direction in which the locking pawl receiver 54a and the locking pawl 54b are disengaged. By moving the locking tool 54c in the direction of the container 45 using a moving means to be described later, the locking pawl receiver 54a and the locking pawl 54b engage with each other, and the rotation of the container 45 is directly transmitted to the shaft 48'. Bevel gear 47
．． Shaft 4 in meshing relationship with shaft 48' via 48°47'
Also on 8.

The same rotational force is transmitted to shaft 48'.

The front wheel differential device 41 has almost the same structure as the center differential device 40. In Figure 0, 55 is a container, 56 is a primary bevel gear,
57 and 57' are secondary bevel gears, and 58 and 58' are bearings that support the container 55. Gear part 55 of container 55
a meshes with the bevel gear 51. Left and right front axles 59 and 59' are attached to the secondary bevel gears 57 and 57', respectively. Further, the front wheel differential device 4I is also provided with a locking device 80 similar to the center differential device 40.

The front axle 59 (59') is attached to the front wheel support case l.
The front wheel shaft 18 is connected to the front wheel shaft 18 via the vertical shaft 19a in the
connected to a.

Next, the structure of the rear axle portion is shown in FIG. A bearing 8 is installed in the center of the rear axle housing 22.
The rotating cylinder 70 supported by the propeller shirt 21 has teeth 71 on its inner surface, and a flange-shaped gear portion 72 is formed on its outer surface. The ends 74a, 74a of the left and right rear axles 74.74 are inserted into the hollow part of the 0-rotation cylinder 70, in which the gears 73 attached to the ends mesh and the rotational force is transmitted. 74a, 74a are formed as spline shafts, and a side clutch 75.75 that meshes with the teeth 7 of the rotating cylinder is slidably fitted on the outer surface.The side clutch 75 has an edge 75a. , this Ayabe 7
5a, the side clutch 75 moves along the end portion 74a, and the cylinder body 70 rotates once.
The meshing relationship between the side clutch 75 and the side clutch 75 is disengaged.

Further, the side clutch 75 is integrally provided with a sliding body 77 and a brake plate pressing member 78, and a brake plate 71]a attached to the outer end of the brake plate pressing member 78.
and a brake shoe 79b fixed to the rear axle housing 22 constitute a plate brake 78.

In this plate brake 78, when the clutch 75 is disengaged, a brake plate 79a and a brake shoe 79b come into contact and the brake is automatically applied.

The rear axle 74 is connected to the rear wheel shaft 24a via a horizontal shaft 23a inside the gear case 23 and a plurality of gears.

FIG. 5 is a diagram showing the relationship between the locking mechanism of the center differential device 40 and the change lever, and FIG. 6 is a circuit diagram thereof. The locking tool 54c of the locking device 54 is.

It is connected to a rod 81 attached to a solenoid 80, and when the solenoid is energized, the rod 81 is retracted to engage the lock claw receiver 54a and the lock claw 54b, and when the solenoid is not energized, the rod 81 is pushed out and the lock is released. is configured to be A changeover switch 83 for energizing the solenoid 80 is installed on the side of the change lever 84 as shown in the figure, and is off when the change lever 84 is shifted to the traveling speed or neutral position. Turns on when shifted to (planting speed) or reverse position. Further, since this circuit passes through the manual changeover switch 88 and the indicator lamp 87, the lock can be released as necessary, such as when turning. A blinking lamp will indicate whether the lock is engaged or not.

In this agricultural vehicle 1, both the center differential device 40 and the front wheel differential device 41 function when traveling on the road. Due to the function of the center differential device 40, the ratio of the driving rotational force transmitted to both axles is appropriately varied depending on the load applied to the front axle and the rear axle, so that smooth running can be achieved. When turning, the front wheels move quickly and the rear wheels move slowly, allowing the vehicle to turn with a small turning radius. Furthermore, when planting or reversing, the center differential device and front wheel differential device are automatically locked by the movement of the change lever, and the same amount of rotational force is applied to all wheels. Therefore, it has excellent straight-line driving performance on low wetlands such as fields and rough roads. When turning in the field, unlock the front wheel differential and
Disengage one side clutch to stop driving the rear wheels.

Along with this, the plate brake is activated and the rear wheels on that side are automatically decelerated, making turning safe and reliable.

(Effects of the Invention) As is clear from the above description, the agricultural vehicle according to the present invention is equipped with a center differential device that transmits an appropriate rotational driving force to both axles according to the load applied to the front axle and the rear axle. Therefore, the driving performance on the road has improved. In addition, a second differential device is installed on the front wheels, and the rear wheels are driven via a side clutch, making it possible to perform tasks efficiently even in fields where slips are likely to occur, such as rice paddies. It has become possible.

[Brief explanation of drawings]

FIG. 1 is a side view of an example of an agricultural vehicle according to the present invention;
Figure 2 is a plan view with the upper cover removed, Figure 3 is a sectional view of the front axle, Figure 4 is a sectional view of the rear axle, and Figure 5 shows the locking mechanism of the center differential device. The explanatory diagram and FIG. 6 are the circuit diagrams of FIG. 5.

Claims (1)

[Claims] (1) In an all-wheel drive agricultural vehicle that has a pair of left and right front wheels and a pair of left and right rear wheels, power from the prime mover is transmitted to the front and rear wheels via a first differential device. At the same time, the power transmitted to the front wheels is transmitted to the left and right front wheels via a second differential device, and the power transmitted to the rear wheels is transmitted to the left and right rear wheels via a side clutch. An agricultural vehicle characterized by being configured as follows.