JPH04197103A - Sulky working machine - Google Patents

Abstract

PURPOSE:To obtain a sulky working machine being readily operated, having small rotation radius, comprising front wheels and rear wheels at the left and right of machine body, wherein a differential device is arranged between the front wheels and a gear change transmission system is connected to a left and a right output shafts of the differential device to produce difference is revolution between the left and the right output shafts during rotation of the machine body. CONSTITUTION:In distributing power of an engine 5 through a transmission case 6 to front wheels 2 and rear wheels 3 in a machine body 1 of a silky working machine such as sulky transplanter having the front wheels 2 and the rear wheels 3 at the left and the right, a differential device 25 is arranged between the front wheels 2, power is transmitted to the front wheels 2 by left and right output shafts 27 of the differential device 25, speed change driving gears 21, etc., of a gear change transmission system equipped with clutches 23 are connected to the left and the right output shafts 27. In rotation of the machine body, one clutch 23 is engaged and difference in revolution is forcibly produced between the left and the right output shafts 27 to rotate the sulky working machine in a small rotation radius.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a riding working machine that can be turned with a small turning radius.

(b) Conventional technology The aircraft has front wheels and rear wheels on the left and right sides, a differential device is installed between the front wheels, and the ring gear of this differential device is rotated to transmit power to the front wheels through the left and right output shafts. Riding work vehicles are already known.

(C) Problems to be Solved by the Invention When the known passenger working vehicle turns its body, the rotational speed of the front wheels located on the inside and the rotational speed of the outer front wheels with respect to the turning center are different from the turning center. Ideally, it should be proportional to the distance, but in the field, the resistance of the left and right front wheels is not uniform, so the front wheel with the higher resistance does not rotate normally as described above, which sometimes causes damage to the field.

In addition, if the front wheels do not rotate normally as described above, the front wheels themselves create resistance and a large load is placed on the large diameter rear wheels, causing the aircraft to head up, making it difficult to drive, and the weight of the rear wheels Due to the increased burden, it became abnormally thick (there were problems such as sinking).

(d) Means for solving the problem The present invention has front wheels and rear wheels on the left and right sides of the aircraft body, a differential device is disposed between the front wheels, and power is transmitted to the front wheels by the left and right output shafts of this differential device. In such a passenger vehicle, a speed change transmission system in which a clutch is interposed between the left and right output shafts is connected, and by engaging one of the clutches when the aircraft turns, a rotational difference is forcibly created between the left and right output shafts. By doing so, the above-mentioned problems were solved.

(E) When working in a working field and turning the aircraft, when the clutch of the transmission transmission system is engaged, the output shaft on that side is forcibly driven at a different rotation speed than the differential device, so the outer front wheel A constant rotational difference is generated between the front wheel and the inner front wheel, and even if the resistance to the left and right front wheels is different, the rotational difference does not fluctuate, allowing smooth turning of the aircraft.

(F) Example An embodiment of the present invention will be explained about a riding work vehicle for a riding rice transplanter shown in the drawings.
, 3, the power of the engine 5 is distributed to the front wheels 2 and rear wheels 3 via the transmission case 6, and is driven by the engine pulley via a V-belt.■Input shaft 8 having a pulley 7 A transmission gear 10 consisting of a large gear 10a and a small gear 10b is slidably spline-fitted to each other, and when the transmission gear 10 is slid slightly to the right from the position shown in FIG. Gear 1 on the right side of
When the small gear 10b meshes with the gear 14 of the back shaft 13, and slides to the left, the large gear 10a is fixed at the center of the intermediate shaft 11. It meshes with the gear 16 that is present, and becomes the second forward speed.

Further, the back shaft 13 is attached to the gear 12 of the intermediate shaft 11.
Another gear 18 is also meshed with the gear, a binion 20 is carved on the left side, and variable speed drive gears 21.21 having clutch pawls on the outside are rotatably fitted on both sides. A movable clutch 23.21 has a clutch pawl on its inner surface and is slid left and right by the shifter 22.
23 are spline-fitted so that they rotate together.

A differential gear 25 is supported in the middle part of the mission case 6 via a bearing, and its ring gear 26 meshes with the binion 20 of the intermediate shaft 11. , the speed change drive gear 21
fixed the variable speed driven gear 28.28 that meshes with the output shaft 2.
A kingpin shaft 30 interlocked with the wheel 7 drives an axle 31 and a front wheel 2.

On the other hand, when the steering handle 32 is rotated, the pitman arm 33 (see Fig. 2) rotates horizontally, and the drag links 34, 34 rotate the knuckle arms 35, 35, so that the front wheels 2, 2 are centered around the kingpin shaft 30. Turn horizontally.

In addition, a restraining rod 39 that is longer than the interval therebetween and has stop plates at both ends is slid onto the bent portion 38a on the rear inner side of the arm 38 that is fixed to the shaft 37 of the left and right shifters 22 and extends rearward. The pitman arm 33 is freely inserted into the collar 40, which prevents the other movable clutch 23 from engaging when one of the movable clutches 23 is engaged and operated, and which is fixed immediately in front of the bent portion 38a. Loosely fit the tip of the clutch rod 43 rotatably connected to the rear part of the clutch rod 43, and
1 and the collar 40, and when the Pitman arm 33 rotates, the arm 38 is pushed via the spring 42.

In the aforementioned passenger work vehicle, while traveling straight, the front wheels 2 are driven via the differential device 25, and the rear wheels 3 are driven by the gear 45 meshing with the other side of the ring gear 26, its shaft 46, and the bevel gear 4.
7, 47, is driven via the propeller shaft 48, rear wheel transmission gear, etc., and when the steering handle 32 is rotated, for example clockwise, to rotate the aircraft, the front part of the pitman arm 33 is rotated to the right. The front wheels 2 also turn to the right in conjunction with this movement. At the same time, the rear part of the pitman arm 33 rotates to the left, so the clutch rod 43 on the side closer to the center of aircraft rotation can only be removed from the collar 40.
The clutch port 43 on the female side (outside) sequentially compresses the spring 42 to rotate the arm 38 and move the shifter 2.
2 engages the movable clutch 23 with the clutch pawl of the speed change drive gear 21, so the output shaft 27 on that side is driven at a higher rotational speed than the ring gear 26 of the differential device 25, and the outer front wheel 2 is driven by the inner front wheel. Rotates faster than 2.

At this time, the pitman arm 33 rotates even after the movable clutch 23 is engaged and operated, but during this time, the spring 42 is compressed to maintain the engaged state as shown in FIG. 3 fb, while the check rod 39 is The other arm 38 is pulled to prevent the other movable clutch 23 from engaging and operating.

When the steering handle 32 is turned back after turning the aircraft, the pitman arm 33 is also turned back, the movable clutch 23 is disengaged, and the left and right output shafts 27, 27 are driven only through the differential device 25. Further, when the upper two steering handles 32 are rotated to rotate the aircraft, the outer front wheels 2 are rotating at a higher speed than the inner front wheels, so the rotation operation can be easily performed. However, even when rotating back, the outer front wheel is driven at a higher speed than the inner front wheel, so a large operating force is required. However, the kingpin shaft 30 has a caster angle θ as shown in FIG. Since it is attached, it can be easily rotated back.

FIG. 5 shows a transmission system in which a friction clutch 50 is used as a clutch, and the friction clutch 50 is integrally attached to a transmission drive gear 21, and a rotatable holder 51 is attached to an output shaft 27. It is composed of a rotating separator plate 52, a disk plate 53 that rotates integrally with the intermediate shaft 11, a disc spring 54, and the like. In this embodiment, the clutch can be engaged and engaged to achieve smoother speed conversion than the pawl clutch method.

In the above-mentioned embodiment, the clutch of the speed change transmission system is interlocked and connected to the operating system, but a manual method such as separately providing a pair of left and right clutch levers and interlocking the clutches using these clutch levers is also possible. You can also do it.

(G) Effects of the Invention The present invention has front wheels 2, 2 and rear wheels 3.3 on the left and right sides of one aircraft 1, and a differential device 25 is disposed between the front wheels.
In a passenger vehicle in which power is transmitted to the front wheels 2 through left and right output shafts 27.27, the left and right output shafts 27.27
By connecting a variable speed transmission system with a clutch interposed between the two and engaging one of the clutches when the aircraft turns, a rotation difference is forcibly created between the left and right output shafts 27, 27, so that during work, When the clutch of the transmission system attached to one output shaft 27 is engaged so that the outer front wheels 2 rotate at a higher speed than the inner front wheels 2 when the aircraft is turning, the left and right output shafts 27.27 are connected to the differential gear 25. and one transmission system, and the outer front wheels 2 are forcibly driven in parallel so that they are faster than the inner front wheels 2 at a constant rotation ratio. Even on a soft running surface, the machine may push mud and disturb the field, the resistance of the front wheels 2 may cause the aircraft to head up, making it difficult to maneuver, or the rear wheels 3 may sink abnormally. It can be reduced.

[Brief explanation of the drawing]

The drawings show one embodiment of the invention. FIG. 1 is an exploded sectional view of the transmission case, FIG. 2 is a plan view of the clutch actuating device, and FIGS. 3 (a) and (b) are sectional views showing the connection structure between the pitman arm and the shift arm.
Figure 4 is a front view of the restraining rod, Figure 5 is a developed sectional view of the main parts of another embodiment, and Figure 6 is a side view of the riding work machine.・Front wheel, 3.. Rear wheel, 15.. Intermediate shaft, 20.. Binion, 21.. Speed change drive gear, 22..
Shifter, 23...Movable clutch, 25...Differential device,
27... Output shaft, 28... Speed change passive gear, 33... Pitman arm, 39... Check rod' etc.

Claims (1)

[Claims] The aircraft body 1 has front wheels 2, 2 and rear wheels 3, 3 on the left and right sides, a differential device 25 is disposed between the front wheels, and power is transmitted to the front wheels 2 by left and right output shafts 27, 27 of the differential device 25. In the passenger vehicle, the left and right output shafts 27, 27 are connected to a speed change transmission system in which clutches are interposed, and when the vehicle turns, one of the clutches is engaged, so that the left and right output shafts 27 are connected.
, 27 forcibly generate a rotation difference.