JP2000272364A - Paddy field work device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal part for preventing leakage of a lubricating oil easily by providing a pair of right and left vertical shaft transmission parts for axially supporting the front wheels at the lower end, elongating downward from lateral shaft transmission parts of a transmission case, and providing a lubricating oil reservoir comprising a main body part and the lateral shaft transmission parts. SOLUTION: Vertical shaft transmission parts 70 elongating downward, are provided on the ends of lateral transmission shafts 61 elongating in lateral shaft transmission parts 60 elongating on the right and left sides of a transmission case such that the rotation of each of the lateral transmission shafts 61 is transmitted to a vertical transmission shaft 74 via bevel gears 71a, 71b. The rotation of the vertical transmission shaft 74 is transmitted to a front axle 73 so as to rotate driving front wheels 1. The vertical shaft transmission part 70 comprises upper case parts 70A formed integrally with the lateral shaft transmission part 60 and rotatable lower case part 70B. The connecting part for the case parts 70A, 70B is provided at a rotatable part 70C for steering. A part of a transmission case main body above the rotatable part 70C, and the lateral shaft transmission parts 60 provide a lubricating oil reservoir.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paddy field working machine such as a rice transplanter provided with a transmission case for supporting a steering front wheel and internally providing a transmission mechanism for the front wheel.

[0002]

2. Description of the Related Art Conventionally, lubricating oil is stored in the entire transmission case to lubricate the transmission case. More specifically, for example, as will be described in an embodiment described below, a transmission case includes a main body, a pair of left and right horizontal transmissions projecting laterally outward from the main body, and a horizontal transmission. And a pair of left and right longitudinal transmission parts extending downward from the lower end and supporting the front wheel at the lower end. When the rotating part is formed in the upper and lower middle of the longitudinal transmission part, the main body part and the horizontal transmission part The lubricating oil was stored in the whole and the vertical transmission part.

[0003]

However, according to the above-mentioned conventional technique, a sufficient amount of lubricating oil can be secured to suppress poor lubrication such as an increase in oil temperature, but the rotating part for steering is difficult to seal. In order to prevent the leakage of lubricating oil over a long period of time, the rotating part seal must be durable, and as a result, the structure of the seal becomes complicated and the cost increases. Was.

An object of the present invention is to simplify the sealing structure and reduce costs while ensuring a sufficient amount of lubricating oil.

[0005]

The features, functions and effects of the present invention according to claim 1 are as follows.

[Characteristics] A lubricating oil is stored in a portion of the transmission case which supports the steering front wheel and which includes a transmission mechanism for the front wheel, and which is on the transmission upper side than the steering rotation portion. The point is that it is configured.

[Operation] The transmission case is divided into a portion on the upper transmission side and a lower transmission portion with respect to the turning portion for steering, and the upper transmission portion stores lubricating oil to transmit the lubricating oil. The lubrication oil is lubricated with the stored lubricating oil, while the lubricating oil is not stored in the lower lubrication part, and the lubrication mechanism of the lower lubrication part is lubricated by means such as grease. Therefore, a simple seal that seals between the upper transmission portion and the lower transmission portion may be used as the seal, and a difficult seal at the rotating portion is not required.

[Effect] Accordingly, while a sufficient amount of lubricating oil can be stored using the transmission upper portion of the transmission case, a seal for preventing leakage of lubricating oil can be constructed with a simple structure and at low cost. Was.

The features, functions and effects of the present invention according to claim 2 are as follows.

[Features] In the present invention according to the first aspect, the transmission case includes a main body, a pair of left and right horizontal shaft transmitting portions projecting laterally outward from the main body, and a lower portion from the horizontal shaft transmitting portion. And a pair of left and right vertical transmission parts that support the front wheel at the lower end, and a rotating part is formed in the upper and lower middle of the vertical transmission part. And a shaft transmission unit.

[Operation] The main body of the transmission case and the horizontal axis transmission portion are used as a lubricating oil storage portion, and the main body portion and the horizontal axis transmission portion are internally lubricated with the transmission mechanism portion with the stored lubricating oil.
Since the vertical transmission part having the rotating part is formed as a non-lubricating oil storage part, the vertical transmission part is lubricated with a grease or other means for the internal transmission mechanism, so that the main body part and the horizontal transmission part Although it is possible to store a sufficient amount of lubricating oil with the above, a simple seal that prevents leakage of lubricating oil from the horizontal axis transmission part to the vertical axis transmission part is sufficient as a seal, and it is difficult for the rotating part No seal is required.

[Effect] Accordingly, a seal for preventing leakage of lubricating oil can be constructed with a simple structure and at low cost, while a sufficient amount of lubricating oil can be stored.

The features, functions and effects of the present invention according to claim 3 are as follows.

[Features] The present invention according to the first and second aspects is characterized in that a traveling hydrostatic continuously variable transmission using lubricating oil in a transmission case as a working oil is provided.

[Operation] Focusing on the fact that a sufficient amount of lubricating oil can be stored in the transmission case and the lubricating oil can be quantitatively used as hydraulic oil for a hydrostatic continuously variable transmission.
Since the lubricating oil in the transmission case is used as hydraulic oil for the hydrostatic continuously variable transmission, a hydraulic oil tank is unnecessary.

[Effects] Accordingly, the hydrostatic stepless transmission can be adopted with a simple structure and at low cost.

The features, functions and effects of the present invention according to claim 4 are as follows.

[Features] According to the third aspect of the present invention, the hydrostatic stepless transmission is connected to a transmission case.

[Operation] Since the hydrostatic stepless transmission is connected to the transmission case, which is a hydraulic oil tank, the piping between the transmission case and the hydrostatic stepless transmission can be shortened.

[Effect] Therefore, the structure can be simplified and the cost can be reduced because the piping can be shortened.

The features, functions and effects of the present invention according to claim 5 are as follows.

[Features] In the present invention according to the third and fourth aspects, a return port for draining oil from a hydrostatic continuously variable transmission is formed in one of the left and right horizontal shaft transmission portions.

[Operation] In the transmission case, the return of the drained oil from the hydrostatic stepless transmission to the horizontal shaft transmission portion having a large contact area with the outside air is determined according to the amount of the hydraulic oil (lubricating oil) to be stored. Since the port is formed to return the drain oil to the horizontal shaft transmission portion, the working oil heated by the hydrostatic continuously variable transmission can be efficiently cooled.

[Effect] Therefore, deterioration of lubricating oil (hydraulic oil) and deterioration of sealing performance due to heat can be suppressed.

The features, functions and effects of the present invention according to claim 6 are as follows.

[Features] In the present invention according to the fifth aspect, a lubricating oil take-out portion is provided at the other of the left and right sides of the transmission case.

[Operation] A lubricating oil outlet is provided at the other side of the left and right sides of the transmission case to form a flow of the lubricating oil in the transmission case with the operation of the hydrostatic stepless transmission. In addition, the entire lubricating oil in the transmission case can be uniformly cooled to improve the lubricating oil cooling performance.

[Effect] Therefore, deterioration of lubricating oil (hydraulic oil) and deterioration of sealing performance due to heat can be further suppressed.

The features, functions and effects of the present invention according to claim 7 are as follows.

[Features] In the present invention according to claims 5 and 6, the hydrostatic stepless transmission is connected to one of the left and right sides of the main body.

[Operation] Since the hydrostatic stepless transmission and the return port are located on the same side on the left and right, it is possible to shorten the return path of the hydraulic oil from the hydrostatic stepless transmission to the horizontal shaft transmission. it can.

[Effect] Accordingly, the operation oil can be returned from the hydrostatic continuously variable transmission to the horizontal shaft transmission portion with a simple structure and at low cost.

[0033]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A rice transplanter, which is an example of a paddy field working machine, includes a pair of left and right driving front wheels 1 and a pair of left and right driving rear wheels 2, as shown in FIGS. A multi-row seedling planting device 4 as an example of a paddy field working device is connected to a rear portion of the riding type self-propelled body 3 via a four-link mechanism 5 so as to be able to move up and down freely. An elevating cylinder 6 using a hydraulic cylinder for elevating and lowering is provided, and a fertilizer application device 7 is provided.

As shown in FIGS. 3 and 4, the self-propelled body 3 includes a transmission case 9 for supporting the driving front wheel 1, and the driving rear wheel 2 via a rear axle case 10. The transmission case 9 of the shaft-supported body frame
The engine 11 is mounted at a position near the front of the vehicle with the output shaft 11a positioned sideways via a vibration isolating rubber 12 (an example of a vibration isolating material). 13 is mounted.

As shown in detail in FIG. 5, the transmission case 9 includes a main body 50, a pair of left and right horizontal shaft transmitting portions 60 projecting laterally (left and right) outward from the main body 50, It comprises a pair of left and right longitudinal transmission parts 70 extending downward from the outer end of the part 60 and supporting the drive front wheel 1 at the lower end.

As shown in FIG. 6, the main body 50 includes
A main clutch 52 using a wet-type multi-plate clutch for intermittently transmitting power from the lateral input shaft 51 to the transmission lower side; a gear-shift type sub-transmission mechanism 53 for switching power from the main clutch 52 to a high-low level; 1 is provided as a transmission element of a traveling power transmission system, and the forward power taken out of the input shaft 53 of the auxiliary transmission mechanism 53 via the one-way clutch C is transmitted to the seedling planting apparatus 4 by shifting. A planting transmission mechanism 55 for changing between stocks is provided as a transmission element of the planting transmission system branched from the traveling transmission system, and is mounted on a transmission shaft 57 to the drive rear wheel 2 in a differential case 56 of the differential mechanism 54. Output gear 5 that meshes with the gear 58
9 is mounted. The main clutch 52 is urged by a spring in an engaged state. The sub transmission mechanism 53
Is equipped with a high-speed transmission gear 53A and a low-speed transmission gear 53B that are engaged with and linked to the output gear 52a of the main clutch 52 so as to rotate integrally with the input shaft 53a.
In addition, a shift gear 53C, which is shiftable in the axial direction, is mounted so as to rotate integrally with a high-speed position engaged with and linked to the high-speed transmission gear 53A and a low-speed position engaged with and linked to the low-speed transmission gear 53B. . The differential mechanism 54 is linked to the output shaft 53b of the subtransmission mechanism 53B via gears G1 and G2.

As shown in FIG. 6 and FIG. 7, the horizontal shaft transmission section 60 has a horizontal transmission shaft 61 therein which is interlocked with the differential mechanism 54. In
As shown in FIG. 7, a vertical transmission shaft 74 that is interlocked with the horizontal transmission shaft 61 via bevel gears 71a and 71b at the upper end and is interlocked with the front axle 73 of the drive front wheel 1 via the bevel gears 72a and 72b at the lower end is installed. Have been. The vertical transmission 70 includes an upper case 70A integrally formed with the horizontal transmission 60, and a lower case 70B rotatably connected to the upper case 70A around the axis of the vertical transmission shaft 74. Consists of That is, the drive front wheel 1 is steered by turning the lower case portion 70B, and the connecting portion between the upper case portion 70A and the lower case portion 70B becomes a turning portion 70C for steering. I have.

The horizontal transmission shaft 61 is provided between the horizontal transmission shaft 61 and a portion of the horizontal transmission portion 60 that is slightly inward of the portion where the outer end of the horizontal transmission shaft 61 is supported via the bearing 62. By interposing a seal 63 for preventing the leakage of the lubricating oil from the portion 60 to the vertical transmission portion 70, the main body portion 50 and the horizontal transmission portion 6 which are on the transmission upper side than the rotating portion 70C are disposed.
0 to form a lubricating oil reservoir, and the main clutch 52
The auxiliary transmission mechanism 53, the differential mechanism 54, and the planted transmission mechanism 55 are lubricated with lubricating oil. On the other hand, the vertical transmission 7
0, that is, the bevel gears 71a, 71b
The lubrication of the meshing portion of the bevel gears 72a and 72b, the rotating portion 70C, and the bearings 75 for supporting the vertical transmission shaft 74 on the vertical transmission portion 70 is performed with grease.

The differential mechanism 54 can be freely switched between an operation state in which differential operation is performed and a non-operation state in which left and right lateral transmission shafts 61 are directly connected to each other and differential operation is not performed. That is, a shift member 54a that is shiftable in the axial direction is integrally mounted on one of the lateral transmission shafts 61 in a non-operating position that meshes and interlocks with the differential case 56 and an operating position that disengages the meshing interlock, and is integrally rotated. By shifting the shift member 54a to the non-operating position, the lateral transmission shaft 61 and the differential case 56 are integrated to bring out the inoperative state, while shifting the shift member 54a to the operating position causes the lateral transmission shaft to shift. It is configured to allow the relative rotation of the differential case 61 and the differential case 56 to show the operating state.

The rear axle case 10 includes a transmission mechanism for transmitting power from the transmission shaft 57 to the driving rear wheel 2.

The boarding operation section 13 includes a steering handle 14 for steering the front wheel 1, a seat 15 located behind the steering wheel 14, a driving step S, and the like. The operation step S is installed at a level higher than the transmission case 9.

The seedling planting apparatus 4 is provided with a seedling stand 16 which is driven to reciprocate at a set stroke in the left-right direction, and moves up and down between the seedling outlet and the field in conjunction with the movement of the seedling stand 16. A plurality of planting mechanisms 17 for taking out the seedlings on the seedling stand 16 by the planting unit amount and planting them in the field by circulating the seedlings on the seedling stand 16 are arranged on the left and right with a spacing between the planting strips. It has a well-known basic structure in which a plurality of ground floats 18 for leveling a field to be planted by sliding are arranged at right and left intervals.

The fertilizer applicator 7 has a fertilizer hopper 19 mounted on the self-propelled machine body 3, and feeds out a set amount of fertilizer in the fertilizer hopper 19 by a set amount in conjunction with the planting operation.
And a groove generator 21 for forming a fertilizer groove in the field as the vehicle travels and supplying the fertilizer sent into the groove, and feeding the fed fertilizer to the groove generator 21 via a hose 22. And an electric fan 23 for generating an airflow for performing the operation.

As shown in FIGS. 3 to 5, on one lateral (left and right) side of the main body 50, a lateral input interlocked with an output shaft 11a of the engine 11 via a transmission 40 is interlocked. Transmission case 9 having shaft 41a
A continuously variable hydrostatic continuously variable transmission 41 using the lubricating oil inside as a working oil, the output of which is transmitted to the transmission case 9
The input shaft 51a and the output shaft 41b are connected to each other in a state where the input shaft 51 is transmitted to the input shaft 51 in a horizontal direction. That is, the output shaft 51b of the hydrostatic continuously variable transmission 51 and the input shaft 5 of the transmission case 9
1 is interlocked and connected by a coupling 101.

The wrapping transmission 40 includes an output shaft 11
The transmission belt 40c is wound around an output pulley 40a mounted on the input shaft 41a and an input pulley 40b mounted on the input shaft 41a, and a tension pulley 40d for applying tension to the transmission belt 40b is provided.

The input shaft 4 of the hydrostatic continuously variable transmission 41
1a extends to the other lateral side through the front part of the main body 50.

As shown in FIGS. 4 and 5, on the other side (left and right) of the main body 50, the extension end of the input shaft 41a of the hydrostatic continuously variable transmission 41 is driven. A hydraulic pump 42 is connected to the steering handle 14 on the upper surface of the main body 50, as shown in FIGS.
A torque generator 43 for hydraulic power steering interlocked with the handle shaft 14a of the vehicle, and a hydraulic control valve 44 for raising and lowering a working device for controlling the lifting and lowering cylinder 6 are attached.

The hydraulic system will be described in detail. As shown in FIG. 8, the transmission case 9 is used as a hydraulic oil tank. An oil filter 45 (an example of a take-out section) for taking out oil is attached, and the hydraulic oil in the transmission case 9 is supplied from the oil filter 45 to the hydrostatic continuously variable transmission 41 and the hydraulic pump 42. The hydraulic oil is supplied from a hydraulic pump 42 to a torque generator 43, and then supplied to a lifting cylinder 6 through a hydraulic control valve 44. The return port 46 to be returned into the case 9 is connected to one of the left and right horizontal
To return the drain oil to the horizontal shaft transmission portion 60,
It is configured to return the oil discharged from the hydraulic control valve 44 when the operation of the elevating cylinder 6 is stopped to the main body 50.

Therefore, the lubricating oil circulates in the order of the hydrostatic stepless transmission 41, the horizontal shaft transmission section 60, the main body 50, the oil filter 45, the hydrostatic stepless transmission 41, and the like. When flowing from the part 60 toward the main body part 50, it is cooled mainly by heat radiation in the horizontal shaft transmission part 60.

L1 is a speed change lever for operating the hydrostatic continuously variable transmission 41, L2 is an auxiliary speed change lever for operating the auxiliary speed change mechanism 53, and P1 is a stepped-down operation. A main clutch pedal for disengaging the main clutch 52 against urging, and a differential lock pedal P2 for switching the differential mechanism 54 to a non-operating state against urging by being depressed. Reference numeral 200 denotes a drag link for linking the knuckle arms 202 of the left and right driving front wheels 1 to the pitman arm 201 which is swingably driven by the torque generator 43.

[Brief description of the drawings]

FIG. 1 is a side view

FIG. 2 is a plan view

FIG. 3 is a side view of a main part.

FIG. 4 is a plan view of a main part.

FIG. 5 is a front view of a main part.

FIG. 6 is a longitudinal rear view of a main part of the transmission case.

FIG. 7 is a longitudinal rear view of a main part of the transmission case.

FIG. 8 is a hydraulic system diagram

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front wheel 9 Transmission case 41 Hydrostatic continuously variable transmission 45 Take-out part 46 Return port 50 Main body part 60 Horizontal axis transmission part 70 Vertical axis transmission part 70C Rotating part

Continued on the front page (72) Inventor Naoki Matsuki 64 Ishizukitamachi, Sakai City, Osaka Prefecture Inside Kubota Sakai Factory (72) Inventor Shinsuke 64 Ishizukitamachi, Sakai City, Osaka Prefecture F-term in Kubota Sakai Factory Co., Ltd. (Reference) 2B062 AA14 AB01 BA06 BA07 BA11 3D042 AA05 AA06 AA10 AB11 BA02 BA04 BA12 BA13 BA19 BA20 BB01 BB02 BB05 BC06 BC10 BC12 CA03 CA13 CA17 CB02 CB17 CB20 CC02

Claims (7)

[Claims] 1. A transmission case which supports a steering front wheel and internally includes a transmission mechanism for the front wheel.
A paddy field working machine configured to store lubricating oil in a portion on the upper transmission side of a steering rotating portion. 2. A transmission case, comprising: a main body, a pair of left and right horizontal shaft transmitting portions projecting laterally outward from the main body, and extending downward from the horizontal shaft transmitting portion, and a lower end supporting the front wheel at a lower end. A pair of left and right vertical transmission parts, wherein the rotating part is formed in the upper and lower middle of the vertical transmission part, and the lubricating oil storage part is constituted by a main body part and a horizontal transmission part. 1
Paddy working machine as described. 3. The paddy working machine according to claim 1, further comprising a hydrostatic continuously variable transmission for traveling using lubricating oil in a transmission case as hydraulic oil. 4. The paddy working machine according to claim 3, wherein the hydrostatic continuously variable transmission is connected to the transmission case. 5. The paddy working machine according to claim 3, wherein a return port for draining oil from the hydrostatic continuously variable transmission is formed in one of the left and right horizontal shaft transmission portions. 6. A paddy field working machine according to claim 5, wherein a lubricating oil take-out portion is provided at the other of the left and right sides of the transmission case. 7. The paddy working machine according to claim 5, wherein a hydrostatic continuously variable transmission is connected to one of the left and right sides of the main body.