JP2554194Y2 - Paddy field work 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 paddy field work vehicle such as a walk-behind rice transplanter, and more particularly to a support structure for an engine output shaft in a paddy field work vehicle.

[0002]

2. Description of the Related Art Conventionally, in a walking rice transplanter, when the rotational force of the engine is transmitted from the output shaft of the engine to the transmission main shaft of the transmission, the base end of the output shaft of the engine is supported by a crankcase. The tip of the output shaft is not supported, and a structure in which a belt is wound between a pulley provided on the output shaft and a pulley provided on the speed change main shaft has been applied.

[0003]

However, since the output shaft of the engine is supported in a cantilever manner, the strength of the output shaft may be insufficient, and the durability of the shaft support of the output shaft may be insufficient. There was a disadvantage.

[0004] Therefore, an object of the present invention is to provide a paddy field working vehicle that solves the above-mentioned problem by also supporting the tip of the output shaft of the engine.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has an engine (2) output shaft (2).
In the paddy field work vehicle (1), which transmits the rotation of 3) to the transmission (T) via the power transmission device (G), the power transmission device and the transmission (T)
Is liquid-tight between the inner case (3a) and the inner case (3a).
The inner case (3a) is housed in a mission case (3) formed separately from a case lid (3b) that covers the inner case (3a).
Is fixed to the outside of the engine (2), the tip portion of the engine output shaft (23), is projected from the inner case (3a) inside the transmission case (3), and the output shaft (23) Is rotatably supported by a bearing (72) formed on the case lid (3b).

[0006]

[Function] Based on the above configuration, the outside of the engine (2)
The inner case (3a) of the transmission case (3) is fixed.
The inner case (3a) is attached to the case lid (3b).
A base end of the output shaft (23) of the engine (2) is supported by a crankcase of the engine (2), and a distal end of the output shaft (23) is covered by the case lid (3b).
And is rotatably supported by a shaft bearing (72) . And a gear (25) attached to the output shaft (23).
Is stably supported by the crankcase of the engine (2) and the bearing (72) of the case lid (3b).

[0007]

[Effects of the Invention] As described above, according to the present invention,
The mission case (3) is integrally fixed to the engine (2).
Use a wrapping medium such as a belt.
From engine (2) to transmission (T)
Power can be transmitted reliably and the output of the engine (2)
The base end of the shaft (23) is supported by the crankcase,
The part is supported by the bearing (72) of the case lid (3b).
The output shaft (23) is stable because it is supported in a state.
And the bearing (7) of the output shaft (23).
2) The durability can be improved.

The reference numerals in parentheses are for comparison with the drawings, and do not limit the configuration of the present invention.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below with reference to the drawings.

As shown in FIG. 6, the walking rice transplanter 1 has a body 6 composed of an engine 2, a transmission case 3, a frame 5, and the like.
The seedling rest 9 is slidably supported in the left-right direction, and a planter 10 is disposed at a lower end portion of the seedling rest 9. Further, a float 11 is suspended below the frame 5 so as to be swingable around a swinging fulcrum 11a at the rear, and the float 11 senses the earth pressure on the rice field surface to detect the body height. It constitutes a detection mechanism. An output shaft 12 protrudes from the left and right sides of the transmission case 3, and a chain case 13 is supported so as to be swingable about the output shaft. A paddy wheel 15 is provided at the tip of the chain case. Supported.

The engine 2 in front of the fuselage 6
A hydraulic cylinder 19 for adjusting the body height is disposed between the bracket 16 fixed to the transmission case 3 and the bumper member 17 fixed to the transmission case 3. The hydraulic cylinder 1
Numeral 9 is a cylinder movable type, the rod 19a of which is fixed to the bracket 16 and the bumper member 17, and the cylinder 19b reciprocates up and down by being guided by the rod 19a. Further, a balance arm 20 is pivotally connected to the cylinder 19b around a pin so that the balance arm 20 can swing left and right. Both ends of the balance arm are fixed to the base end of the swing chain case 13 via rods 21, respectively. Arm 13a
It is connected to. One transmission operation lever 22 extends rearward from the transmission case 3.

On the other hand, as shown in FIGS. 3 to 5, a transmission T is provided below the engine 2.
3 is the entire mission case. The power from the PTO shaft 23 of the engine 2 is transmitted by the gear 25, the gear 27a supported by the shaft 26, the gear 27b integrated with the gear, the transmission main shaft 2
The power is transmitted to a transmission main shaft 24 in the transmission case 3 via a gear 29 fixed to the transmission case 4. In addition, PTO shaft 2
3, gear 25, gears 27b and 27a, shaft 26, gear 29
The transmission main shaft 24 constitutes a power transmission device G from the engine 2 to the transmission T. A planter drive shaft 30 is rotatably supported adjacent to the transmission main shaft 24, and a counter shaft 31 is rotatably supported adjacent to the other of the transmission main shaft 24. Further, axle cases 32, 3 are provided at the front end of the transmission case 3.
2 are fixed, and the cylindrical portions 13b of the chain cases 13, 13 are swingably inserted and fitted into the axle cases 32, 32, respectively. Left and right output shafts 12, 12 are supported by the axle cases 32, 32, and are supported by an axle on a chain case 13 via a chain from a sprocket 33 fixed to the tip of the output shaft 12. The power is transmitted to the wheels 15. In the transmission case 3, a planter intermediate shaft 35 is rotatably supported along with the counter shaft 31.

Further, inter-shift gears A and B comprising shift gears are fixed to the planter drive shaft 30, and a shift gear body 36 slides on the shift main shaft 24 so as to be selectively meshable with the inter-shift gears A and B. The gear body 36 has a narrow gear C and a wide gear D formed thereon. The counter shaft 31 has a small gear 37 and a large gear 3.
The output shafts 12, 12 are provided with side clutches 40, 40. The side clutches 40, 40 are composed of final gears 41 which are supported by the output shafts 12, 12. The output shaft 12 is configured to be able to mesh with one or both of them. A reverse gear body 42 is slidably and rotatably mounted on the planter intermediate shaft 35, and a planter clutch 43 is slidably mounted on the planter intermediate shaft 35. Shaft 45 case 3
A sprocket 46 is fixed to the outer end of the shaft, and the planter clutch 43 can move the hollow shaft 45 and the planter intermediate shaft 35 toward and away from each other. The reverse gear body 42 includes a large gear 42b and a small gear 42c, and the large gear 42b is always meshed with the narrow gear C of the transmission gear body 36,
The position where the large gear 42b meshes with the final gear 41 and the position where the small gear 42c meshes with the large gear 39 are switched. The sprocket 46 and the sprocket 47 provided at the end of the planter drive shaft 30 are combined with the chain 4.
A sprocket 50 for transmitting power to a planting device such as the planter 10 is attached to the left end of the planter intermediate shaft 35.

As shown in FIG. 4, a screw shaft 51 extends in the left-right width direction and is rotatably supported at the upper rear portion of the transmission case 3. A slide block 52 slides on the screw shaft 51. Only movement is screwed freely. Further, the power of the screw shaft 51 is transmitted from the intermediate shaft 35 of the planter via the sprocket 53, the chain 55, and the sprocket 56, and the slide block 52 reciprocates within a certain stroke based on the rotation of the screw shaft 51. As shown in FIG. 5, the slide block 52 has a first swing arm 59 fixed to the front end of the lower rotating shaft 57.
It is connected to. As shown in FIG. 9, the rotating shaft 57 extends back and forth along the side of the frame 5 and is rotatably supported, and has a second swing at the rear end of the rotating shaft 57. The arm 60 is fixed, and the seedling rest 9 is connected to the tip of the arm 60. Therefore, the reciprocating motion of the slide block 52 based on the rotation of the screw shaft 51 causes the seedling rest 9 to reciprocate left and right via the first swing arm 59, the rotating shaft 57 and the second swing arm 60. Have been.

Next, operation devices for the traveling transmission and the inter-stock transmission will be described with reference to FIG. One transmission operation lever 22 extending rearward from the transmission case 3 has a shaft at its base and is rotatably supported by the case 3. As shown in FIG. 6, the tip end 22b of the speed change operation lever 22 is bent upward, and the tip end 22b is formed into an arc-shaped guide groove 61a of a guide member 61 as shown in FIG. Swinging along
Therefore, the base is rotated forward and backward. Then, the shift operation lever 22 is operated along the guide groove 61a of the guide plate 61 to each of the second forward speed F2 (road running speed), the first forward speed F1 (working speed), the neutral N, and the reverse R. In the first forward speed F1, the position is further operated to small, large, and middle positions between the stocks.

Next, referring to FIG. 1 which is an enlarged view of an input section from the engine 2 in FIG. 3, the PTO shaft 23 and the gears 27a, 2
7b, the hydraulic pump 71 will be described in detail. The transmission case 3 is divided substantially at the center, and FIG.
3a is a left transmission case as an inner case . Then, the left transmission case 3a is
Fixed to the outside of the gin 2 and the left transmission case
A case lid 3b is oil-tightly mounted so as to cover 3a, and a hydraulic pump 71 is oil-tightly mounted on the case lid 3b.

[0017] and, PTO shaft 23 of the engine 2, its
Is supported by the case crank of the engine 2
An end is rotatably supported by a shaft bearing hole 72 of the case lid 3b. A gear 25 is attached to the PTO shaft 23 by a key or the like so as to be movable only in the axial direction, and a boss of the gear 25 on the case 3a side. Part end 25a is inserted into hole 73 of case 3a.

The tip 8 of the shaft 26 of the hydraulic pump 71
The gear 27a is fitted to the gear 27 while being prevented from rotating, and a boss end 75 of the gear 27a is supported by a bearing hole 76 of the case 3a.

Next, from the engine 2 to the transmission case 3
When the engine 2 rotates, the shaft 23 rotates, the gear 27b rotates via the gear 25 that is prevented from rotating by a key or the like, and the gear 27a integral with the gear 27b rotates. Transmission main shaft 2 through gear 29
4, the rotation of the engine 2 is transmitted into the transmission case 3. When the gear 27a rotates, the distal end portion 81 of the shaft 26 to which the gear 27a is fixed.
The rotation is transmitted to the hydraulic pump 71 as the shaft 26 rotates.
Operates.

The engine 2 and the case 3a are detached from each other, and the engine 2 is moved together with the PTO shaft 23 from the gear 25 as shown in FIG.
When moved to the right, the engine 2 can be removed from the case 3a. At this time, since the gear 25 is engaged with the case 3a by the boss end 25a and maintains an almost assembled state, when the engine 2 is mounted on the case 3a, the PTO shaft 23 is easily inserted into the gear 25, The engine 2 can be easily attached to and detached from the case 3a.
To make maintenance easier. Also, the PTO shaft 23 is
Since both ends are supported by the b and the crankcase of the engine 2, the strength of the PTO shaft 23 can be improved.

Further, the pump shaft 26 is supported by the pump case at the base end and the distal end via the boss end 75 of the gear 27a, so that the strength of the pump shaft 26 can be improved and the pump shaft 26 can be improved. The durability of the bearing part can be improved.

Next, the gear shifting operation will be described with reference to FIGS. 2 and 3. In the first forward speed (road surface speed step) F2, the lever 22 is set to the F2 position of the guide plate 61. The gear c of the transmission gear body 36 meshes with the large gear 42b of the reverse rotation gear body 42, and the large gear 42b of the reverse rotation gear body 42 meshes with the final gear 41. Side clutch 40 is output shaft 12
, The rotational force transmitted from the PTO shaft 23 to the transmission main shaft 24 is transmitted to the gear c and the large gear 42 of the reverse gear body 42.
b, to the output shaft 12 via the final gear 41 and the side clutch 40. The counter shaft 31 is rotated by the final gear 41 and the small gear 37. However, since the large gear 39 and the gear D are not meshed with each other, there is no problem only by idling. Further, the planter drive shaft 30 is rotated by the engagement of the gears B and D, and the sprocket 47,
Hollow shaft 45 through chain 49 and sprocket 46
Rotates, but since the planter clutch 43 is disengaged, the planter intermediate shaft 35 does not rotate, and the planting device such as the planter 10 does not operate.

First forward speed (planting traveling speed stage) F1 When the speed change operation lever 22 is located in the F1 region of the guide plate 61, the gear D of the speed change gear body 36 is formed to be wide, so that the gear is always set. The gear D is engaged with the gear D, the large gear 39, the counter shaft 31, the small gear 3 and the rotational force transmitted from the PTO shaft 23 to the speed change main shaft 24.
7. The planting traveling speed is transmitted to the output shaft 12 via the final gear 41 and the side clutch 40.

When the operating lever 22 is set at a small position between the stocks, the rotational force of the transmission main shaft 24 is transmitted to the planter drive shaft 30 via the gears D and B of the transmission gear body 36, and the small rotation The speed is transmitted to the planter intermediate shaft 35 via the sprocket 47, the chain 49, the sprocket 46, the hollow shaft 45, and the planter clutch 43.

When the operating lever 22 is set at a large position between the stocks, the rotational force is transmitted to the planter drive shaft 30 via the gear C and the gear A, and the large rotational speed is further transmitted to the planter intermediate shaft 35. .

When the operating lever 22 is set at the middle position between the stocks, the rotational force is transmitted to the planter drive shaft 30 via the gear C and the gear B, and the intermediate rotational speed is further transmitted to the planter intermediate shaft 35. You.

That is, although the planting traveling speed is formed at one speed step, the planting drive shaft 30, the sprocket 47, the chain 49, the sprocket 46, the hollow shaft 45, the planter clutch 43, and the planter intermediate shaft 35 The planter 10 is rotated from the sprocket 50 at small, large, and medium rotation speeds, and the stock interval is adjusted between large, small, and medium.

Neutral speed stage N When the shift operation lever 22 is set to the position N, the engagement between the gear D and the gear 39 of the shift gear body 36 is cut off and the output shaft 1
The rotation force to 2 is not transmitted.

When the shift operation lever 22 is set to the position R, the transmission of the rotational force from the gears C and D of the transmission gear body 36 to the gear 39 is cut off, and the rotation of the transmission main shaft 24 is changed to the gear C and the reverse gear. Low-speed reverse rotation is transmitted to the output shaft 12 via the large gear 42b and the small gear 42c of the body 42, the large gear 39, the counter shaft 31, the small gear 37, the final gear 41, and the side clutch 40.

Although the walking type rice transplanter has been described above, the present invention is not limited to this, and the riding type rice transplanter,
Needless to say, the present invention can be similarly applied to other paddy field working machines such as a submerged direct sowing machine.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a part of a transmission according to the present invention.

FIG. 2 is a front view showing a guide member of the speed change operation lever.

FIG. 3 is a sectional development view showing the entire transmission to which the present invention is applied.

FIG. 4 is a sectional front view showing the screw shaft portion.

FIG. 5 is a side view showing the transmission.

FIG. 6 is an overall side view of the walking rice transplanter.

[Explanation of symbols]

 Reference Signs List 1 paddy field working vehicle (walking rice transplanter) 2 engine 3 transmission case 3a part of case 3b case lid (case lid) 23 output shaft (PTO shaft) 72 cylindrical portion (shaft bearing hole) G power transmission device T transmission

Claims (1)

(57) [Scope of request for utility model registration] 1. A paddy working vehicle that transmits rotation of an engine output shaft to a transmission via a power transmission device, wherein the power transmission device and the transmission are connected to an inner casing.
And a case lid that covers the inner case in a liquid-tight manner.
Stored in the formed mission case, the inner case
Is fixed to the outside of the engine, rotate the engine output shaft, said to protrude from the inner case inside the transmission case, and a tip portion of the output shaft at journalled portion formed on the case lid A paddy field working vehicle that is supported as possible .