JPH0361406A - Wheel drive device for riding seedling transplanter - Google Patents

Abstract

PURPOSE:To always enable comfortable operation of a riding seedling planter both on a field and on a road by automatically changing over driving of left and right back wheels from side clutches to a differential gear based on selection of a working speed and operation speed on the road with a speed changer. CONSTITUTION:A differential gear 19 divides rotation power of an engine 2 and transmits the power to left and right back wheels 5. A speed changer 15 located between the engine 2 and the gear 19 converts the rotation power of the engine 2 to a working speed and a road travel speed higher than the working speed. Furthermore, a pair of side clutches 28 located between the gear 19 and the left and right back wheels 5 interrupts the rotation power transmitted from the gear 19 to the back wheels 5. A differential locking device (diff-lock device) 23 prevents differential rotation of the gear 19. The aforementioned diff-lock device 23 is connected to the speed changer 15 so that the operation of the gear 19 may be prevented when the rotation power of the engine 2 is transmitted at the working speed and the gear 19 may be simultaneously operated when the power is transmitted at the road travel speed. As a result, a seedling planter is comfortably operated both on a field and on a road.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a drive device for the rear wheels of a riding seedling planting machine, which allows for small turns and good straightness during seedling planting work.
Running on the road embodies a seedling planting machine that operates smoothly.

(Conventional technology) For riding seedling transplanters that require particularly strong demands for tight turns on headlands and straight-line performance during transplanting, a side clutch is used to drive the rear wheels. If smoothness is required, a differential device is used to drive the rear wheels.

In addition, a system in which these side clutches and differential devices are selectively used is also disclosed in Japanese Utility Model Application No. 183629/1983.

(Problems to be Solved by the Invention) However, the device disclosed above has not yet been put into practical use, probably because the deblocking devices are operated individually, which is complicated.

(Means for Solving the Problems) This invention solves the above problems by interlocking a differential lock device with a transmission. Specifically, the present invention solves the above problems by interlocking a differential lock device with a transmission. , 5; a differential device 19 that divides the rotational power of the engine 2 and transmits it to the left and right rear wheels 5, 5; A transmission device 15 that converts between a working speed and a faster road running speed, and a rotational power that is located between a differential device 19 and the left and right rear wheels 5, 5 and is transmitted from the differential device upper 9 to the rear shafts 5, 5. A pair of side clutches 28, 28 that connect and disconnect the differential gear [19
The differential lock device 23 prevents the operation of the differential device 9 when the rotational power of the engine 2 is being transmitted at working speed, and when the rotational power of the engine 2 is being transmitted at road speed. A driving device for wheels in a riding seedling planting machine is characterized in that the differential gear [119] is connected to a transmission top 5 so as to operate.

(Function) When putting this riding seedling transplanter into the field to perform seedling planting work, the operator operates the speed change lever 14 so that the speed change device 15 transmits the rotational power of the engine 2 to the differential device 19 at a low working speed. Manipulate. Then, the differential lock device 23 is activated, and the upper differential device 9 is no longer activated. Therefore, the rotational power of the engine 2 is converted to a low speed by the transmission 15, and then divided into three parts by the differential 19.
is transmitted to propel the traveling vehicle body 1. Here, since the operation of the differential device 19 is prevented by the differential lock device @23, the left and right rear wheels 5, 5 rotate at a constant speed, and this riding seedling transplanter has good straight running performance.

When the traveling vehicle body 1 reaches a headland and turns for turning work, the side clutch 28 on one side is operated while operating the steering wheel 3.

Then, by operating this side clutch 28, the differential gear 19
Since the power transmitted to one rear wheel 5 is cut off and the rear wheel 5 on that side stops, the other rear axle 5 continues to be driven at the same rotation speed as before, so the traveling vehicle body 1 is Turn with radius. Note that it is even better if the rear axle 5 on the side where the power transmission is cut off is stopped by a braking device, and it is more effective if the side clutch 28 is operated in conjunction with the steering wheel 3.

Next, for example, when the seedling planting work is finished and the operator wants to operate the riding seedling planting machine on the road, the operator sets the transmission 115 to change the rotational power of the engine 2 to a differential speed that is higher than before on the road! 19, operate the gear shift lever 14. Then, the differential lock device 23 is activated and the differential!
! ! 19 becomes operational.

Therefore, the rotational power of the engine 2 is converted to a higher speed than before by the transmission 15, and then divided into three directions by the differential device 19, transmitted to the left and right rear wheels 5, 5, and transmitted to the traveling vehicle body.
promote. Here, the differential gear 19 is operating with the differential lock released, so when the inner rear axle 5 becomes low speed during a turn, the outer rear wheel 5 is accelerated by that amount and becomes high speed. To run a riding seedling planting machine smoothly.

(Effect) As described above, according to the present invention, the left and right rear axles are
, 5 are automatically switched between the side clutch 28 and the differential gear 19, so that the riding seedling planting machine can always be operated comfortably in the field and on the road.

(Example) Next, a detailed explanation of the invention shown in one drawing will be given.

The running vehicle l includes an engine 2, a pair of left and right front axles 4, 4 steered by a steering wheel 3, and a pair of rear wheels 5, 5.
A seedling planting device 6 is attached to the rear of the device by a link 7.

After the engine 2, a main shaft 9 is connected with a clutch 8 in between, and a two-stage transmission gear 10 is provided on the main shaft 9 so as to be movable in the axial direction. A three-stage passive gear 12 is rotatably provided on a transmission shaft 11 parallel to the main shaft 9, and the gear 12c is always in mesh with a reverse gear 13. The speed change gear 10 is as follows.

By operating the speed change lever 4, the small gear 10a moves on the main shaft 9, and the small gear 10a is transferred to the large gear 12a and the reverse gear 13.
0b selectively meshes with the small gear 12b, forming a transmission 15.

The transmission shaft 16 has a transmission gear 17 that meshes with the small gear 12b.
is fixed in the middle, and its ends are .

It is connected to the front and rear differential gears 18 and 19.

A pair of differential shafts 20.20 extend left and right from the rear differential gear 19, and the left differential shaft 20 has a shaft that engages and separates from the pawl 19a of the differential gear 19 when moved in the axial direction by the shifter 21. A claw 22 is provided to constitute a differential lock group [123].

On the outside of the differential shaft 20.20 there is an axle 24.24 of the rear wheels 5, 5 extending outward from this, and at the inner end of this axle 24.24 there is an axle 24.24 which can be moved in the axial direction by actuation of a shifter 25.25. A movable pawl 27.27 that engages and separates from the fixed pawl 26.26 of the operating shaft 20.20 is provided to constitute a side clutch 28.28.

The gear shift lever 14 and shifter 21 are such that when the small gear 10a is engaged with the large gear 12a, the claw 22 is engaged with the claw 19a, and when the large gear 10b is engaged with the small gear 12b, the claw 22 is engaged with the claw 1.
It is connected with a wire 29 so as to be separated from 9a.

In front of the seat 30, there is a pair of left and right pedals 31, 31, and when the pedals 31, 31 are stepped on, the moving claws 27.27 move from the fixed claws 26.26. When the foot is removed from the petals 31 and 31, the movable claws 27 and 27 return to their original positions and are connected to the fixed claws 26 and 26 by wires 32 and 32, respectively.

At the rear end of the main shaft 9, there is a two-stage planted gear 33 that rotates the speed change shaft 11 in two ways.
After that, there is a PTO shaft 34 which is connected to the seedling planting device 16 via a propeller shaft 35.

At the tip of the PTO lever 34, there is a pawl 38 that is moved in the axial direction by a planting lever 36 and engages or separates from a pawl 37 at the rear end of the speed change shaft 11, forming a planting clutch.

When the riding seedling transplanter configured in this way is placed in a field and used for seedling planting work, the operator uses the clutch 8 to cut off the power transmitted from the engine 2 to the main shaft 9, and then operates the speed change lever 14 to change the speed change gear. Move 10, its small gear 10
a is engaged with the large gear 12a of the passive gear 12, and the clutch 8
Put in.

Then, the wire 29 is loosened by operating the gear shift lever 14, and the shifter 21 engages the pawl 22 with the pawl 19a. Therefore, the differential gear 19 and the differential shaft 20 are fixed, and the differential gear! !
19 will no longer operate (the differential will be locked).

Here, the rotational power of the engine 2 is transmitted through the clutch 8 and the main shaft 9.
, small gear 10a of transmission gear 10, large gear 12a of passive gear 12, small gear 12b thereof, transmission gear 17, transmission shaft 16
and is transmitted to the front wheels 4, 4 via the front differential 18 in this order as a low working speed. Also, from the rear end of the transmission shaft 16, the 1 actuating device 19, its operating shafts 20, 20, and the fixed pawl 2 are also visible.
6, 26, the circumferential speed is transmitted to the pair of left and right rear wheels 5, 5 through the moving claws 27.27 and the axle 24.24 in the same way as the front wheels 4, 4, and the traveling vehicle body 1 is transferred to these four wheels 4, 4. and 5
, 5. On the other hand, each part of the seedling planting device 6 is driven by the power transmitted from the PTO shaft 34 through the propeller shaft 35, and the seedlings are transplanted.

Here, the field is made of mud, and the left and right rear wheels are 5.5
There is a difference in the resistance that acts before and after.

Although it changes between the left and right, as mentioned above, in this riding seedling transplanter, the operation of the differential device 19 is blocked, so both the left and right rear wheels 5, 5 rotate at the same speed. , the traveling vehicle body 1 rarely turns.

When the vehicle body 1 planting the seedlings in this way reaches the headland, the operator turns the steering wheel 3 to the right, for example, and steps on the right bevel 31.

Then, the right wire 32 moves the right shifter 25, the moving pawl 27 on that side separates from the fixed pawl 26, the rotational power transmitted from the right differential shaft 20 to the right axle 24 is cut off, and the right shifter 25 moves. Rear wheel 5 will no longer turn. On the other hand, the left rear wheel 5 is
It continues to rotate with the same power transmission as before. As a result, the traveling vehicle body 1 turns with a small diameter, and efficient turning operation is performed.

Next, when the field planting work is completed and the riding seedling transplanter is to be operated on the road, the operator disengages the clutch 8 and then operates the gear shift lever 14 to move the gear 10, and the large gear 10b. The clutch 8 is engaged with the small gear 12b of the passive gear 12.

Then, by operating this shift lever 14, the wire 29 is pulled, and the shifter 21 separates the pawl 22 from the pawl 19a.
The lock of the differential thus far is released, and the differential device [9] becomes ready for operation.

Here, the rotational power of the engine 2 is transmitted through the clutch 8 and the main shaft 9.
, the large gear 10b of the transmission gear 10, the small gear 12b of the passive gear 12, the transmission gear 17, the transmission shaft 16, and the front differential 18, and are transmitted to the front wheels 4, 4 as a road speed faster than the working speed. . Also, from the rear end of the transmission 4Qil16, the differential bag W19, its differential #20, 20, and the fixed pawl 26
, 26, the circumferential speed is transmitted to the pair of rear wheels 5, 5 through the moving pawls 27, 27 and the axle 24, 24 in the same manner as the front wheels 4, 4, thereby causing the traveling vehicle body 1 to travel at high speed.

Here, the operator operates the steering wheel 3 to turn the traveling vehicle body 1 as desired.

The differential gear 19 is activated, and the wheels 4 and 5 on the inside of the turn are decelerated, and the wheels 4 and 5 on the outside of the turn are conversely accelerated and turn smoothly.

Although FIG. 2 shows only the minimum necessary range, various devices will be added in implementation.

Further, this differential lock device may be operated in the following manner.

- When power is being transmitted to the seedling planting device 6, the defroster device W23 stops the operation of the differential device 119.

■When the seedling planting device 6 is raised to a height where it can rotate on the headland,
A differential lock device 23 stops the differential device 19 from operating.

■When the aircraft tilts significantly left and right or front and rear, or when the front axle housing that swings around the center bin rotates significantly, the differential lock device 23 locks the differential device 11.
Stop the operation of 9.

■If you turn the steering wheel 3 beyond the specified angle, a differential lock device will be activated! 23 deactivates the differential 19.

[Brief explanation of drawings]

The second construction drawing is a side view of a riding seedling transplanter to which the present invention is applied, and FIG. 2 is a diagram of its transmission mechanism. The symbols in the figure are as follows. 1 Traveling vehicle body 2 Engine 4 Front wheel 5 Rear wheel

Claims (1)

[Claims] A traveling vehicle body 1 having an engine 2, front wheels 4, and a pair of left and right rear wheels 5, 5, a differential device 19 that divides the rotational power of the engine 2 and transmits it to the left and right rear wheels 5, 5, and a differential gear between the engine 2 and the left and right rear wheels 5, 5. A transmission device 1 located between the device 19 and converting the rotational power of the engine 2 into a working speed and a faster road speed.
5, a pair of side clutches 28, 28 which are located between the differential device 19 and the left and right rear wheels 5, 5, and which connect and disconnect the rotational power transmitted from the differential device 19 to the rear wheels 5, 5; The differential lock device 23 is provided with a differential lock device 23 which prevents the differential device 19 from operating when the rotational power of the engine 2 is being transmitted at working speed, and which prevents the differential device 19 from operating when the rotational power of the engine 2 is being transmitted at working speed. A drive device for wheels in a riding seedling planting machine, characterized in that a device 19 is operatively connected to a transmission device 15.