JP2912796B2 - Mission in riding rice transplanter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission in a riding rice transplanter, and more particularly, to a back gear in a transmission case of a riding rice transplanter having a transmission and a steering device, and a steering constituting a steering device. The present invention relates to an arrangement structure of gears.

[0002]

2. Description of the Related Art Conventionally, in a transmission of a riding rice transplanter, the rotation of a main shaft gear is transmitted to a traveling drive shaft gear via a reduction gear and transmitted from the main shaft gear to a planting drive shaft gear in a transmission case. The back gear is arranged below the main shaft gear, and a steering gear constituting a steering device is arranged in the transmission case below the back gear in the transmission case.

[0003]

However, since the steering gear is arranged further below the back gear provided below the main shaft gear, the volume of the lower portion of the transmission is increased, thereby increasing the volume of the steering gear. The minimum ground clearance between the lower end of the mission case and the ground was reduced, and the wetland performance was reduced.

Accordingly, the present invention provides a back gear supported on a shaft in a transmission path from the main shaft gear to the planting drive shaft gear at a position above a traveling drive path including a main shaft gear, a reduction gear, and a traveling drive shaft gear. By disposing the steering gear in the transmission case below the main shaft gear and the reduction gear, the volume at the lower part of the transmission is reduced and the minimum ground clearance between the lower end of the transmission case and the ground is increased. By improving the wet field performance and arranging the planting drive shaft and the shaft for the back gear at approximately the same position as the shaft position of the planted PTO output shaft, it is possible to configure without increasing the volume at the top of the transmission. The purpose is to provide such a mission.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has been made in consideration of the above circumstances.
The rotation of the main shaft gear (53) is transmitted to the traveling drive shaft gear (62a) via the reduction gears (59, 60), and the main shaft gear (53) is accommodated in the transmission case (7). And a transmission (7) transmitted to a planting drive shaft gear (75) in the riding rice transplanter (1), a back gear (69) that can selectively mesh with the reduction gears (59, 60). To the shaft (S) in the transmission path from the main shaft gear (53) to the planting drive shaft gear (75).
9), and the back gear (69) is disposed above a traveling drive path including the main shaft gear (53), reduction gears (59, 60), and a traveling drive shaft gear (62a), and the steering device ( The steering gear (81, 82, 83, 85) constituting the main shaft gear (53)
And, it is arranged in the transmission case (7) below the reduction gears (59, 60).

[0006]

According to the above-mentioned construction, the transmission case (7) is provided with a drive shaft including a main shaft gear (53), reduction gears (59, 60) and a drive shaft (62a). A planting drive path including a gear (53), a back gear (69), and a planting drive shaft gear (75) is provided, and the main shaft gear (53) and the reduction gears (59, 6) are provided.
0) below the steering gear (81, 82, 83, 8).
By disposing 5), the volume at the lower part of the transmission (52) can be reduced, the lower end position of the transmission case (7) can be increased, and the back gear (6) can be increased.
9) with the main shaft gear (53) and the planting drive shaft gear (7).
By providing the planting drive path of 5), the volume of the upper portion of the transmission (52) can be suppressed.

[0007] The reference numerals in parentheses are for comparison with the drawings, but do not limit the present invention in any way.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 5 and 6, the riding rice transplanter 1 has a body 5 supported by a front wheel 2 and a rear wheel 3, and an engine 6 and a transmission case are provided at the front of the body 5. A seat 7 is mounted, and a driver's seat 9 having a sheet 8 is arranged at the rear. A rice transplanting device 11 is supported at the rear of the body 5 via a link device 10 so as to be able to move up and down. A seedling mounting table 12, a planter 13 and a float 15 are attached to the rice transplanting device 11. . In the driver's seat 9, a main transmission operation lever 16, a continuously variable transmission operation lever 17, and a steering shaft 18 are erected, and a steering wheel 18a is rotatably supported on the upper end of the shaft 18. ing. The main transmission operation lever 17 can be operated along a guide hole from a neutral position, a forward traveling region, a reverse traveling region, and a work region.
17 is supported swingably in the front-rear direction, the neutral position,
A W-cam type belt-type continuously variable transmission 19 is provided below the continuously variable transmission operation lever 16 and can be operated in a low speed range and a high speed range. Further, lateral axle housings 20, 20 are protrudingly provided on both sides of the transmission case 7, and vertical axle housings 21, 21 are directed downward (slightly obliquely outward) from these lateral axle housings 20, 20. ) These vertical axle housings 2
Reference numerals 1 and 21 are elastically extendable. Front wheels 2, 2 are rotatably supported at lower ends of the vertical axle housings 21, 21. A drive shaft S7 extends rearward from the lower rear end of the transmission case 7 along the lower surface of the frame 5, and the drive shaft 22 is connected to a rear axle housing 23. Rear transmissions 25, 25 are provided at both ends of the rear axle housing 23, and rear wheels 3, 3 each composed of a paddy wheel are supported by the rear transmissions 25, 25. The rear axle housing 23
A clutch and a brake are provided therein, and power is disconnected and connected to the left and right rear wheels 3 and 3 independently, and the brake is operated. Also, a shaft S1 for planting PTO from the upper rear end of the transmission case 7
1 extends rearward (see FIG. 1) so that power from the transmission in the transmission case 7 is transmitted to the planter 13 and the like via a propeller shaft.

Next, a W cam type belt type continuously variable transmission will be described with reference to FIG.

A shaft S1 as an engine output shaft protrudes from the engine 6, and a hydraulic pump drive pulley 26 is fixed to a base end side of the shaft S1 by a key or the like. A boss 27b of a fixed sheave 27a of a driving pulley 27 is keyed on the shaft end side outside the shaft 26.
And so on. The boss portion 27b has a movable seat.
A boss 27d of the bush 27c is slidably supported by the key. Further, a roller support 28 supported at the tip of the fixed sheave boss portion 27b via a bearing is provided.
A roller 29 is rotatably supported at a phase of 80 degrees. A shift operation cam 30 is rotatably supported on the movable sheave boss portion 27d via a bearing. The cam 30 has an end face cam portion 30a in contact with the roller 29. With the arc extending in the outer diameter direction
And a memory portion 30b.

On the other hand, a roller support 32 is fixed to the outer surface of the transmission case 7, and two rollers 32a, 32a are rotatably supported on the support 32.
A main shaft S2 is rotatably supported by the case 7, and a boss portion 33b of a fixed sheave 33a of the traveling driven pulley 33 is provided on a protruding portion of the shaft S2 via a bearing. Only rotation is supported. A boss 35a of the movable sheave 35 is slidably supported by a key on the boss 33b.
A gear changing operation cam 36 is supported by a bearing 5a via a bearing. The cam 36 has an end cam 36a in contact with the roller 32a and an arm 36b extending in the outer diameter direction. Have. The cam 36 is connected to the cam 30 so as to be integrally linked. A sleeve 37 is slidably supported on the shaft end side of the driven follower pulley 33 of the main shaft S2 via a spline or the like. The sleeve 37 has a plurality of desk displays.
Are fixedly installed. In addition, fixed sheave 3
A support portion 40 is fixed to the outer peripheral portion of the back surface of 3a with bolts, and a plurality of separator plates 4 are attached to the support portion 40.
A clutch cover 42 is attached to a side end of the cover 42 via a bolt, and an inner peripheral portion of the cover 42 contacts a bearing via a seal. I have. A cover 39 is provided in the cover 42.
A clutch plate 44 capable of operating the separator plate 41 to or away from the spring S in order or against the spring S is provided. On the other hand, a sleeve 43 is rotatably supported on the distal end side of the main shaft S2, and a clutch operation lever 45a of a clutch operation moving cam 45 is supported slidably only. 45 is a cam part 45
b. A fixed cam 46 for clutch operation is supported on a shaft S2 via a bearing at the shaft end side of the sleeve 43 so as to be rotatable only.
6 is engaged with the moving cam 45.

The belt-type continuously variable transmission 19 includes a drive pump.
And a V-belt 46 wound around the driven pulley 27 and the driven pulley 33. The hydraulic belt transmission 47 is provided with a drive pulley 26, The driven pulley 87 (see FIGS. 1 and 2) and the V wound around the drive pulley 26 and the driven pulley 87
It is composed of a belt 49 and the like. Reference numeral 50 denotes a tension pulley of the belt-type continuously variable transmission 19, and reference numeral 51 denotes a tension pulley of the hydraulic belt transmission.

On the other hand, a mission 52 is stored in the mission case 7 as shown in FIG. A main shaft S2 is rotatably supported on the transmission case 7, and a transmission gear 53 including a small diameter gear 53a and a large diameter gear 53b is provided inside the case 7 of the shaft S2.
Are slidably supported, and a gear 55, a gear 56 and a gear 57 are fixedly provided. A shaft S3 is rotatably supported by the transmission case 7 below the main shaft S2, and a gear 59, a gear 60 and a gear 61 are fixed to the shaft S3. The gear 59 and the gear 60 are appropriately switched and meshed with the small diameter gear 53a and the large diameter gear 53b of the transmission gear 53. Below the shaft S3, shafts S5a, S5b are rotatably supported by the transmission case 7 and the axle housings 20, 20, and extend over the shaft ends of the shafts S5a, S5b to form a differential gear case. A case 62 is provided, and the case
A ring gear 62a is fixed to the gear 62, and the ring gear 62a is meshed with the gear 61 of the shaft S3. Below the shafts S5a and S5b, the shaft S
6 is rotatably supported by a transmission case 7;
A gear 63 is fixedly provided on one side of the shaft S6.
On the other side, a bevel gear 65 is fixed. Gear 6 above
3 is meshed with the ring gear 62a, and the bevel gear 6
5 is meshed with the bevel gear 66 of the traveling PTO shaft S7 (see FIG. 1).

On the other hand, a shaft S9 is rotatably supported by the transmission case 7 above the main shaft S2, and a gear 67, a back gear 69 and a gear 70 are fixedly mounted on one side of the shaft S9. On the other side, a gear 71 for shifting between stocks composed of a gear 71a and a gear 71b is slidably supported. The back gear 69 can mesh with the gear 53a of the shaft S2 by sliding. The gear 71a can slide and mesh with the gear 55 and the gear 56 of the shaft S2, and the gear 71b can slide and mesh with the gear 57 of the shaft S2. Above the shaft S9, a planter shaft S10 is rotatably supported by the transmission case 7, and the shaft S10 has a gear 75a.
And a gear 75b is supported slidably only. The gear 75a is slidable and engageable with the gear 67 of the shaft 9, and the gear 75b is a back gear 69 of the shaft 9. And can engage with each other. A bevel gear 76 is fixed to an intermediate portion of the planter shaft S10, and the bevel gear 76 is rotatable relative to the planter shaft S10.
A trickle-mitter 77 is formed between the liquid crystal panel 10 and the liquid crystal panel 10.

A shaft S11 is rotatably supported by the transmission case 7 so as to be orthogonal to the upper side of the planter shaft S10. A bevel gear 78 is fixed to the shaft S11. Is meshed with the bevel gear 77 of the shaft S10. A planter clutch 79 is disposed above the bevel gear 78 of the shaft S11.

On the other hand, as shown in FIG. 1, FIG. 2 (a) and FIG.
A steering shaft 18 is rotatably supported by the gear 7, and a steering gear 81 is provided below the shaft 18.
Is fixed. A counter shaft S13 is rotatably supported in the vicinity of the steering shaft 18, and a gear 82 and a gear 83 are fixed to the counter shaft S13. Has been engaged. In the vicinity of the counter shaft S13, a sector shaft S15 is rotatably supported by the transmission case 7, and a gear 85 is fixed to the sector shaft S15 by a spline or the like. A pitman arm 86 is fixed to the lower end of the sector shaft S15 so as to mesh with the gear 83 of the shaft S13.

At the intermediate portion between the steering shaft 18 and the counter shaft S13, a hydraulic pump driving shaft S16 is rotatably supported by the transmission case 7, and from the case 7 of the shaft S16. A hydraulic pump driving driven pulley 87 is fixed to a protruding portion of the shaft. A hydraulic pump 88 is connected to an end of the shaft S16 in the case 7, and the hydraulic pump 88 is connected to the shaft S16. It is configured to operate by rotation of.
An oil filter 89 and a suction pipe 90 are provided below the transmission case 7.

Next, the operation of the present embodiment will be described.

When the engine 6 is operated, the drive pulley 26 for the hydraulic pump rotates with the rotation of the engine output shaft S1, and the rotation of the drive pulley 26 is transmitted to the driven pulley 87 via the belt 49. The hydraulic pump 88 is transmitted to drive the hydraulic pump 88. On the other hand, the rotation of the engine output shaft S1 is transmitted to the fixed sheave 27a of the traveling drive pulley 27, and the main clutch 4
When 2 is in contact, it is transmitted to the main shaft S2 via the belt-type continuously variable transmission 19.

The rotation of the main shaft S2 is transmitted from the gear 53b to the gear 59 based on the operation of the main speed change operation lever 16 to the forward movement region, and the differential gear case is transmitted through a gear 61 coaxial with the gear 59. , And the front wheel 2 is driven via the shafts S5a, s5b and the like. Further, the differential gear case 62
The rotation of the bevel gear 65 coaxial with the gear 63 is transmitted to the shaft S7 via the bevel gear 66, and the rear wheel 3 is driven. Also,
The rotation of the shaft S2 is transmitted from the gear 53b to the back gear 69 based on the operation of the main transmission operation lever 16 to the reverse region, transmitted to the gear 60 via the gear 70 coaxial with the gear 69, and The power is transmitted to the gear 62a via the coaxial gear 61, and the front wheel 2 is driven via the shafts S5a and s5b. The gear 63a is transmitted from the gear 62a of the differential gear case 62 to the gear 63.
The rotation of the bevel gear 65 coaxial with the shaft S7 is transmitted to the shaft S7 via the bevel gear 66, and the rear wheel 3 is driven. The rotation of the shaft S2 based on the operation of the main transmission operation lever 16 to the work area causes the inter-gear transmission gear 71 to be appropriately switched,
Gear 55 to gear 71a, gear 56 to gear 71a
And transmitted from the gear 57 to the gear 71b. The rotation of the shaft S9 is performed by appropriately switching the inter-gear transmission gear 75, from the gear 67 to the gear 75a, from the gear 69 to the gear 7
The rotation is transmitted to 5b. The power is transmitted to the bevel gear 78 via the bevel gear 76 coaxial with the gear 75, and the shaft S11 is driven.

At this time, the steering wheel 1
8a, the gear 82 rotates through the gear 81, the gear 83 coaxial with the gear 82 is transmitted to the gear 85, the pitman arm 86 is operated, and the drag connected to the pitman arm 86 is operated. Steering is performed by a link.

As described above, according to the present invention, the back gear 69 is disposed between the gear 53 and the gear 75 in the transmission case 7, and the back gear 69 includes the gear 53, the reduction gear 59, and the gear 62a. The steering gear 81, the gear 82, the gear 8
The gear 3 and the gear 85 are arranged below the gear 53 and the reduction gear 59. Further, the shaft S9 and the planter shaft S10 are arranged at substantially the same position as the axial position of the shaft S11.

Next, the inter-stock shift will be described.

In this embodiment, as shown in FIG. 4, a back gear 69 is fixed to the shaft S9, an inter-stock transmission gear 71 is provided, and an inter-stock transmission gear 75 is provided to the shaft S10. 69 is also used as the inter-stock transmission gear, so that when the riding rice transplanter 1 advances, the inter-gear transmission gear 71 converts between the gear 55 and the gear 71a, the gear 56 and the gear 71a, and the gears 57 and 71b. While being meshed, the inter-gear transmission gear 75
, The gear 67 and the gear 75a and the gear 69
And the gear 75b. As described above, in the present embodiment, the back gear 69 is also used for the inter-stock shift, so that the multi-stage between the stocks can be realized. It is not necessary to measure the volume, and the cost can be reduced while the structure is simple.
Therefore, it is possible to reduce the number of gears and increase the number of inter-stock shifts with a simple operation.

Further, the arrangement of the hydraulic pump driving shaft and the hydraulic pump will be described. In this embodiment, FIG.
As shown in FIGS. 2A and 2B, a hydraulic pump driving shaft S16 is disposed between the steering shaft 18 and the counter shaft S13, and a transmission case is provided at an end of the shaft S16. Is connected to a hydraulic pump 88 installed at Since the space between the main shaft S2 and the hydraulic pump driving shaft S16 and the space between the shaft 5 and the shaft S16 are sufficient, the oil filter 89 can be removed without increasing the volume of the transmission case 7. It can be arranged directly on the suction pipe 90 side by utilizing the empty space of the steering gear in the case 7, and the V wound around the drive pulley 27 and the driven pulley 33. The belt 46 and the V-belt 49 wound around the drive pulley 26 and the driven pulley 87 can be easily replaced, and furthermore, the tire does not come into contact with the hydraulic pump 88 and the tire is cut. The corners are not damaged.

[0026]

As described above, according to the present invention,
The back gear is supported on a shaft in a transmission path from the main shaft gear to the planting drive shaft gear at a position above the traveling drive path including the main shaft gear, the reduction gear, and the traveling drive shaft gear,
Since the steering gear is disposed in the transmission case below the main shaft gear and the reduction gear, the volume under the transmission is reduced, and the minimum ground clearance of the transmission case is increased to improve wetland performance. In addition, since the planting drive shaft and the back gear shaft are arranged at substantially the same position as the shaft position of the planted PTO output shaft, the volume at the top of the transmission can be increased without increasing the volume.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a mission according to an embodiment of the present invention.

2A is a longitudinal sectional view of the hydraulic pump, the steering gear, and the like in FIG. 1 viewed from an arrow X direction. FIG. 2B is a plan sectional view of the hydraulic pump, the steering gear, and the like in FIG.

FIG. 3 is a sectional view of a belt-type continuously variable transmission.

FIG. 4 is a developed sectional view of a mission.

FIG. 5 is an overall side view showing a riding rice transplanter to which the present invention can be applied.

FIG. 6 is a plan view showing the airframe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Riding rice transplanter 7 Mission case 52 Mission 53 Main shaft gear 59 Reduction gear 60 Reduction gear 62a Travel drive shaft gear (ring gear) 69 Back gear 75 Planting drive shaft gear (inter-gear transmission gear) 80 Steering device 81 Steering gear 82 Steering gear 83 Steering gear 85 Steering gear S2 Main shaft (main shaft) S9 Back gear shaft (back gear shaft) S10 Planting drive shaft (planter shaft)

Claims (1)

(57) [Claims] 1. A steering device, which is housed in a transmission case and transmits rotation of a main shaft gear to a traveling drive shaft gear via a reduction gear and transmits the rotation from the main shaft gear to a planting drive shaft gear. And a transmission, wherein a back gear that can selectively mesh with the reduction gear is supported on a shaft in a transmission path from the main shaft gear to the planting drive shaft gear, and the back gear is mounted on the main shaft. Gear, a reduction gear, and a traveling drive shaft gear, which are disposed above a traveling drive path, and a steering gear constituting the steering device,
A transmission in a riding rice transplanter, wherein the transmission is disposed in the transmission case below the main shaft gear and the reduction gear.