JP4223048B2 - Passenger work vehicle - Google Patents

Description

  The present invention relates to a riding-type work vehicle such as a riding-type rice transplanter, a riding-type direct seeding machine, a riding-type transplanter, and a riding-type management machine.

  In a passenger work vehicle, a right side clutch that can transmit and cut off power transmitted to the right rear wheel, and a left side clutch that can transmit and block power transmitted to the left rear wheel, Some are configured such that when the right and left front wheels are steered to the right (left), the right (left) side clutch is manipulated to the disengaged state. Thus, when the rear wheel on the turning center side is in a freely rotating state during turning (the side clutch on the turning center side is disengaged), the rear wheel on the turning center side can turn without roughening the work site.

When the right and left side clutches are provided in the passenger work vehicle, the pitman arm for steering the right and left front wheels and the right and left side clutches are not mechanically linked. It has been proposed that the right and left knuckle arms for rotating the left front wheel and the right and left side clutches are mechanically linked.
The present invention includes a right and left side clutch in a passenger work vehicle, and when the right and left knuckle arms that rotate the right and left front wheels are mechanically linked to the right and left side clutches, It is intended to be configured so that the left steering limit is not restricted.

(Constitution)
The first feature of the present invention resides in the following configuration in a passenger work vehicle.
The right side clutch that can transmit and shut the power transmitted to the right rear wheel is provided on the right side of the fuselage behind the right and left knuckle arms that rotate the right and left front wheels around the vertical axis respectively. A left side clutch capable of transmitting and interrupting power transmitted to the left rear wheel is provided on the left side of the fuselage behind the right and left knuckle arms . The linkage rod is connected across the right knuckle arm and the left side clutch, and the linkage rod is connected across the left knuckle arm and the right side clutch. When the right and left front wheels are steered to the right, the left knuckle arm is operated to disengage the right side clutch via the linkage rod, and when the right and left front wheels are steered to the left, the right The left side clutch is operated to be disconnected through the linkage rod by the knuckle arm .

(Function)
According to the first aspect of the present invention, when the right and left side clutches are provided, the right side clutch is provided on the right side of the fuselage behind the right and left knuckle arms , and the left side clutch is provided on the right and left sides. The knuckle arm is provided on the left side of the fuselage, and the connecting rod is connected across the right knuckle arm and the left side clutch, and the connecting rod is connected across the left knuckle arm and the right side clutch. Connected. Therefore, when the right and left front wheels are steered to the right, the left knuckle arm is operated to disengage the right side clutch via the linkage rod, and the right and left front wheels are steered to the left. Then, the left side clutch is operated to be disconnected by the right knuckle arm via the linkage rod.

In this case, the linkage rod may be extended rearward from the right knuckle arm and connected to the right side clutch, and the linkage rod may be extended rearward from the left knuckle arm and connected to the left side clutch. Conceivable. However, with the configuration as described above, when the right and left front wheels are steered to the right, for example, the rear side of the right front wheel interferes with the linkage rod connected across the right knuckle arm and the right side clutch. As a result, the right and left steering limits are small.

According to the first feature of the present invention, the linkage rod is connected across the right knuckle arm and the left side clutch, and the linkage rod is connected across the left knuckle arm and the right side clutch. The connecting rod from the right knuckle arm faces the left and right center of the aircraft and passes through the left and right center of the aircraft to reach the left side clutch. The linkage rod from the left knuckle arm faces the left and right center of the aircraft and passes through the left and right center of the aircraft to reach the right side clutch. As described above, according to the first feature of the present invention, since the linkage rods from the right and left knuckle arms are directed not to the rear but to the left and right central sides of the aircraft, even if the right and left front wheels are steered greatly. Since the rear side of the right and left front wheels rarely interfere with the linkage rod, it is difficult to achieve a state where the right and left steering limits are limited.

(The invention's effect)
According to the first aspect of the present invention, when the right and left side clutches are provided in the passenger work vehicle, the linkage rod is connected across the right knuckle arm and the left side clutch, and the left knuckle arm and the right By connecting the linkage rod across the side clutch, the rear side of the right and left front wheels are less likely to interfere with the linkage rod even when the right and left front wheels are steered greatly. As a result, the steering performance of the passenger work vehicle can be improved because the left steering limit can be made difficult.

[1]
FIG. 1 and FIG. 2 show a riding type rice transplanter as an example of a riding type work vehicle. A fertilizer device 3 is provided at the rear of the machine body supported by right and left front wheels 1 and right and left rear wheels 2. A four-row planting type seedling planting device 6 is connected to a link mechanism 5 that is provided and driven up and down by a hydraulic cylinder 4.

Next, support structures for the right and left front wheels 1 and the right and left rear wheels 2 will be described.
As shown in FIGS. 1, 2, 3, 5, and 9, the mission case 7 is arranged at the lower part of the front part of the airframe so as to extend in the front-rear direction of the airframe. The right and left wheel support cases 8 are connected to the left lateral side and extend right and left (the right and left wheel support cases 8 do not move up and down with respect to the mission case 7). . The right and left support cases 9 are rotatably supported around the vertical axis P1 at the ends of the right and left wheel support cases 8, and the right and left front cases 1 are supported by the right and left support cases 9. The right and left front wheels 1 together with the right and left support cases 9 are configured to be steerable left and right around the vertical axis P1.

  As shown in FIGS. 1 and 5, boss portions 7c are formed on the right and left lateral sides of the rear end of the mission case 7 so as to protrude right and left lateral sides, so that the right and left support cases 10 are formed. However, the boss 7c is supported so as to be swingable up and down independently around the horizontal axis P2 in the left-right direction. The right and left support cases 10 extend rearward from the boss portion 7c, and the right and left rear wheels 2 are supported at the rear portions of the right and left support cases 10, and the right and left rear wheels 2 are The steering operation is not performed.

  As shown in FIGS. 1 and 2, a hydraulic cylinder 4 and a link mechanism 5 are connected to a frame 11 extending from a mission case 7, and right and left supports are shown in FIGS. A spring type suspension mechanism 12 is connected across the case 10 and the frame 11. As a result, the right and left support cases 10 (rear wheels 2) are moved up and down independently.

  As shown in FIGS. 5 and 11, the outer surface of the rear portion of the mission case 7 is provided with a recessed support portion 7 d opened rearward. A resistance member 13 that is bent in a square shape in plan view with a metal round bar having sufficient elasticity is prepared, and an intermediate portion of the resistance member 13 is inserted into the support portion 7d of the transmission case 7 to form a plate shape. The support member 14 of the mission case 7 is closed by the support member 14, and the support member 14 is fixed to the mission case 7 by bolts 15. The right and left ends of the resistance member 13 are attached to the right and left support cases 10.

  The state shown in FIGS. 5 and 11 is the support state of the support member 14, and the intermediate part of the resistance member 13 is rotatably supported by the support part 7 d of the mission case 7. When the difference in height occurs, the middle part of the resistance member 13 is twisted, and resistance is applied from the resistance member 13 to the right and left support cases 10 with respect to the difference in height. By removing the bolt 15 and removing the support member 14 from the support portion 7d of the mission case 7 (detached state), the intermediate portion of the resistance member 13 can be removed from the support portion 7d of the mission case 7.

[2]
Next, transmission structures for the right and left front wheels 1 and the right and left rear wheels 2 will be described.
As shown in FIG. 5, the mission case 7 has a two-divided structure of a right divided portion 7a and a left divided portion 7b, and the combined portion of the right and left divided portions 7a and 7b is along the longitudinal direction of the aircraft. ing. As shown in FIGS. 1 and 4, a support frame 16 is connected to the front portion of the mission case 7, and the engine 17 is supported on the support frame 16. A hydrostatic continuously variable transmission 18 is connected to the upper part of the front portion of the left divided portion 7 b, and the power of the engine 17 is transmitted to the hydrostatic continuously variable transmission 18 via a belt transmission mechanism 19. .

As shown in FIGS. 9 and 10, the differential mechanism 20 is disposed at the position of the front lower portion (right and left wheel support case 8) of the mission case 7, and the right and left wheel supports from the differential mechanism 20. A transmission shaft 21 is installed over the case 8. Inside the transmission case 7, a cylindrical shaft 22 is fitted on the right transmission shaft 21 so as to be relatively rotatable, a transmission gear 23 and a sprocket 24 are fixed to the cylindrical shaft 22, and the cylindrical shaft 22 is connected to the differential mechanism via the sprocket 24. It is connected to 20 cases 20a.
As a result, the axle case is configured by the lower part of the front part of the transmission case 7 (in which the differential mechanism 20 is installed) and the right and left wheel support cases 8, so that the four-planting type seedling planting device 6 is provided. It is a corresponding tread.

  With the structure described above, the power of the engine 17 is transmitted to the hydrostatic continuously variable transmission 18 via the belt transmission mechanism 19 and from the auxiliary transmission 25 of the transmission case 7 (gear-shifting and variable to high and low two stages). It is transmitted to the right and left front wheels 1 through the transmission gear 23, the cylindrical shaft 22, the differential mechanism 20, and the right and left transmission shafts 21. The power of the cylindrical shaft 22 is transmitted to the right and left through a sprocket 24, a transmission chain 26, right and left side clutches 27 (see FIG. 5), and a transmission chain (not shown) built in the right and left support cases 10. It is transmitted to the left rear wheel 2 (in this case, no differential mechanism is provided for the right and left rear wheels 2).

  As shown in FIGS. 9 and 10, the shift member 28 is externally fitted to the right transmission shaft 21 so as to be integrally rotatable and slidable by the key structure, and a spring 29 that biases the shift member 28 toward the separated side of the transmission gear 23. An operation shaft 30 is provided for sliding the shift member 28 to the transmission gear 23. Thus, when the shift member 28 is separated from the transmission gear 23, the differential mechanism 20 is activated, and when the shift member 28 is engaged with the transmission gear 23, the case 20 a of the differential mechanism 20 is brought into contact with the right transmission shaft 21. As a result, the differential mechanism 20 enters the differential lock state.

[3]
Next, the mounting structure of the power steering mechanism 33 will be described.
As shown in FIGS. 7 and 8, semi-circular and flange-shaped mounting seats 7e are integrally formed on the right and left divided portions 7a and 7b at the upper joint portion of the front portion of the mission case 7. The circular and flange-shaped mounting seats 7e are formed by the mounting seats 7e of the right and left divided portions 7a and 7b.

  As shown in FIGS. 5, 7, and 8, a hydraulic power steering mechanism 33 is prepared, and the power steering mechanism 33 is provided with a circular mounting portion 33c. A mounting portion 33c of the power steering mechanism 33 is fitted into mounting seats 7e of the right and left divided portions 7a and 7b, and a mounting portion 33c of the power steering mechanism 33 and mounting seats of the right and left divided portions 7a and 7b. An O-ring 34 is attached to the 7e.

  In this case, in a state where the right and left divided portions 7a and 7b are connected as shown in FIG. 8, the mounting seat 7e of the left divided portion 7b does not come out with respect to the mounting seat 7e of the right divided portion 7a ( It is set to be a little lower). Thus, the mounting portion 33c of the power steering mechanism 33 and the mounting portion 33c of the power steering mechanism 33 and the mounting seat of the left divided portion 7b are fitted in the mounting seats 7e of the right and left divided portions 7a and 7b. 7e, a slight gap is formed, and the mounting portion 33c of the power steering mechanism 33 is attached to the mounting seat 7e of the right divided portion 7a by the bolt 35 as shown in FIGS. It is connected.

  As shown in FIG. 7, the lubricating oil is put inside the mission case 7, and a mounting seat 7f is integrally formed at the lower part of the front portion of the right divided portion 7a, so that the right divided portion 7a is attached. An oil filter 36 is attached to the seat 7f. As a result, as shown in FIGS. 1, 3, and 4, the oil filter 36 is positioned below the support frame 16 on the outer surface of the lower portion of the front portion of the mission case 7.

  As shown in FIGS. 4 and 5, a hydraulic pump 37 is connected to the upper part of the front portion of the right divided portion 7a, and a control valve 38 for supplying / discharging hydraulic oil to / from the hydraulic cylinder 4 is connected to the left divided portion. It is connected to the upper part of the rear part of 7b. As a result, the lubricating oil in the mission case 7 is supplied as hydraulic oil from the oil filter 36 via the pipe 39 to the charge pump (not shown) of the hydrostatic continuously variable transmission 18. Lubricating oil is supplied as hydraulic oil from the oil filter 36 to the hydraulic pump 37 via the pipe 40. The hydraulic oil of the hydraulic pump 37 is supplied to the power steering mechanism 33 via the pipe 41 and is supplied to the control valve 38 via the pipe 42, and the hydraulic oil of the control valve 38 is supplied to the transmission case 7 via the pipe 43. It has been returned.

[4]
Next, the structure of the steering operation of the right and left front wheels 1 will be described.
As shown in FIG. 4, the steering handle 44 disposed above and the input shaft 33 a of the power steering mechanism 33 are connected via a steering shaft 45 and a universal joint 46. As shown in FIGS. 4, 7, and 8, in the transmission case 7, a case part 7 g is integrally formed at the lower part of the front part of the right and left divided parts 7 a and 7 b, and the output shaft 33 b of the power steering mechanism 33 is formed. In addition, a steering shaft 48 is connected via a joint 47, and the steering shaft 48 is inserted into the case portion 7 g through the front portion inside the transmission case 7. Between the transmission case 7 and the case portion 7g, a bearing 49 and an oil seal 50 are externally fitted to the steering shaft 48. The oil seal 50 prevents the lubricating oil in the transmission case 7 from entering the case portion 7g. ing.

  As shown in FIGS. 7 and 8, a pinion gear 48a is provided at the lower end portion of the steering shaft 48 inside the case portion 7g. The rack gear 51 is supported by the case portion 7g so as to be slidable in the left-right direction of the machine body, and is arranged along the left-right direction of the machine body so as to protrude right and left from the case part 7g, as shown in FIGS. Thus, the rack gear 51 is positioned on the front side of the axle of the right and left front wheels 1. The pinion gear 48a and the rack gear 51 are engaged with each other inside the case portion 7g, and a pressing member 52 and a spring 53 that press the rack gear 51 against the pinion gear 48a are provided. Lubricating grease is applied to the pinion gear 48a, the rack gear 51, and the pressing member 52.

  As shown in FIG. 5, knuckle arms 54 are fixed to the right and left support cases 9, and right and left tie rods 55 are connected across the rack gear 51 and the right and left knuckle arms 54. . As shown in FIGS. 3, 5, and 8, a rubber bellows-like elastic cover 56 is attached to the right and left ends of the rack gear 51 and the case part 7 g, and the case part 7 g is connected to the right side. In addition, water and soil are prevented from adhering to the rack gear 51 protruding to the left.

  As shown in FIG. 6 (a), in a state where the steering handle 44 and the rack gear 51 are positioned in the straight traveling position, the right and left tie rods 55 are obliquely forward with respect to the rack gear 51 (the left-right direction of the machine body). ing. As shown in FIG. 8, when the steering handle 44 is operated to the right (left) and the rack gear 51 slides to the right (left), the cover 56 is attached to the right and left ends of the rack gear 51. The ring-shaped attachment member 57 comes into contact with the left (right) end of the case portion 7g, and the right and left front wheels 1 cannot be steered to the right (left) any more (right ( (Left) is the steering limit). As shown in FIG. 6B, in the state where the rack gear 51 is positioned at the left (right) steering limit, the left (turning center side) tie rod 55 is in relation to the rack gear 51 (the left-right direction of the machine body). It is facing diagonally backward.

[5]
Next, the operation structure of the right and left side clutches 27 will be described.
As shown in FIG. 5, right and left side clutches 27 are provided on the right and left of the rear part of the mission case 7. When the right (left) side clutch 27 is operated in the transmission state, power is transmitted to the right (left) rear wheel 2, and when the right (left) side clutch 27 is operated in the disengaged state, the right (left) rear The power to the wheel 2 is cut off, and the right (left) rear wheel 2 is in a freely rotating state.

As shown in FIG. 5, the right and left knuckle arms 54 are provided with operation pins 54a. A right linkage rod 58 is connected across the operation pin 54a of the right knuckle arm 54 and the operation arm 27a of the left side clutch 27 (one end of the right linkage rod 58 is connected to the left side clutch 27). The operation pin 54a of the right knuckle arm 54 is inserted into a long hole 58a connected to the operation arm 27a and provided at the other end of the right linkage rod 58). The left linkage rod 58 is connected across the operation pin 54a of the left knuckle arm 54 and the operation arm 27a of the right side clutch 27 (one end of the left linkage rod 58 is connected to the right side clutch 27). The operation pin 54a of the left knuckle arm 54 is inserted into a long hole 58a connected to the operation arm 27a and provided at the other end of the left linkage rod 58).

  As a result, as shown in FIGS. 5 and 6 (a), the right linking rod 58 passes from the right knuckle arm 54 toward the left and right center side of the fuselage and passes under the transmission case 7 to the left side clutch 27. Has reached. From the left knuckle arm 54, the left linking rod 58 passes through the lower side of the transmission case 7 toward the left and right center side of the aircraft and reaches the right side clutch 27.

  The state shown in FIGS. 5 and 6 (a) is a state where the steering handle 44 and the rack gear 51 are positioned in the straight traveling position, and the right and left side clutches 27 are operated to the transmission state, and the right and left Power is transmitted to the rear wheel 2. Even if the right and left front wheels 1 are steered between the right and left set angles from the straight traveling position, the right and left linkage rods 58 are operated by the interchange of the long holes 58a of the right and left linkage rods 58. Instead, the right and left side clutches 27 are maintained in a transmission state. In this case, the right and left linking rods 58 are directed toward the center of the left and right sides of the fuselage and pass under the transmission case 7 and reach the right and left side clutches 27. Even if the steering operation is performed to the right, the rear side of the right front wheel 1 does not interfere with the right linkage rod 58. Even if the steering handle 44 is operated to the left, the rear side of the left front wheel 1 is There is no interference with the left connecting rod 58.

  Next, when the right and left front wheels 1 are steered to the left steering limit side beyond the left set angle, the right link is made by the operation pin 54a of the right knuckle arm 54 as shown in FIG. The rod 58 is pulled, and the left side clutch 27 is operated to be disconnected. In this case, the right side clutch 27 is maintained in the transmission state by the accommodating action of the long hole 58a of the left connecting rod 58, and even if the right and left front wheels 1 are steered to the left steering limit. The rear side of the left front wheel 1 does not interfere with the left linkage rod 58.

  When the right and left front wheels 1 are steered to the right steering limit side beyond the right set angle, the left linkage rod 58 is pulled by the operation pin 54a of the left knuckle arm 54, and the right side The clutch 27 is operated to the disengaged state. In this case, the left side clutch 27 is maintained in the transmission state due to the accommodating action of the long hole 58a of the right linkage rod 58, and even if the right and left front wheels 1 are steered to the right steering limit. The rear side of the right front wheel 1 does not interfere with the right linkage rod 58.

[First Alternative Embodiment of the Invention]
The riding type rice transplanter described in the above-mentioned [Embodiments of the invention] corresponds to the four-planting type seedling planting apparatus 6.
When this riding type rice transplanter is changed to one corresponding to the five-row type seedling planting device 6, as shown in FIGS. 12 and 13, a mission case 7 and right and left wheel support cases 8 A ring-shaped intermediate case 31 is inserted between them, and the right (left) wheel support case 8 and the intermediate case 31 are connected to the transmission case 7 by bolts 32, and the right and left transmission shafts 21 are changed to long ones. To do. In the right and left rear wheels 2, the axle 2a shown in FIG. 5 is changed to a long one, and the right and left tie rods 55 and the right and left linkage rods 58 are changed to long ones. As described above, a tread corresponding to the 5-row planting seedling planting device 6 is obtained.

  In the above-described [Embodiment of the invention], the transmission case 7 constitutes a part of the axle case, but the differential case that houses the differential mechanism 20 is configured separately from the transmission case 7 to form the axle case. May be. Further, instead of the intermediate case 31 having one type of horizontal width, a plurality of types of intermediate cases 31 having different horizontal widths may be prepared and used.

[Second Embodiment of the Invention]
In the above-mentioned [Embodiment of the invention] and [First another embodiment of the invention], the case portion 7g is not the lower part of the front portion of the right and left divided portions 7a, 7b, but the right or left divided portion 7a. , 7b, the steering shaft 48 may be inserted into the case portion 7g through the outside instead of the inside of the transmission case 7.
Instead of forming the case portion 7g integrally with the transmission case 7, the case portion 7g may be configured separately from the transmission case 7 and connected to the transmission case 7 with bolts.

[Third Another Embodiment of the Invention]
In the above-mentioned [Embodiment of the Invention] and [First Alternative Embodiment of the Invention] and [Second Alternative Embodiment of the Invention], the following configuration may be adopted.
The pinion gear 48a and the rack gear 51 may be disposed rearward with respect to the axles of the right and left front wheels 1, and the knuckle arms 54 may be fixed rearward to the right and left support cases 9. With this configuration, in the state where the steering handle 44 and the rack gear 51 are positioned in the straight traveling position, the right and left tie rods 55 face obliquely rearward with respect to the rack gear 51 (left and right direction of the fuselage), and the rack gear 51 In the state of being positioned at the (left) steering limit, the left (right) tie rod 55 on the side opposite to the turning center is obliquely forward with respect to the rack gear 51 (lateral direction of the machine body). Instead of the rack gear 51, a piston rod or a pitman arm of an all hydraulic power steering may be used.

  In the structure shown in FIG. 5, the right and left linking rods 58 may be connected to the front portions (portions to which the tie rods 55 are connected) of the right and left knuckle arms 54. With this configuration, when the right and left front wheels 1 are steered to the right and left steering limit sides beyond the right and left set angles, the left (right) linkage rod 58 is pushed, The right (left) side clutch 27 is operated to be disconnected.

[Fourth Embodiment of the Invention]
In the above-mentioned [Embodiment of the Invention] and [First Alternative Embodiment of the Invention] to [Third Alternative Embodiment of the Invention], the following configuration may be adopted.
The mission case 7 is configured in a three-divided structure by adding another divided portion to the right and left divided portions 7a and 7b, and a mounting seat 7e is provided at the joining portion of two divided portions of the three divided portions. You may comprise so that it may form.

[Fifth Embodiment of the Invention]
In the above-mentioned [Embodiment of the Invention] and [First Alternative Embodiment of the Invention] to [Fourth Alternative Embodiment of the Invention], the following configuration may be adopted.
In the right and left rear wheels 2, the right and left support cases 10 are abolished and the same axle cases as the right and left front wheels 1 are provided, and the right and left rear wheels 2 are supported by the axle case. May be. When configured in this manner, the axle case may be configured as described in the above-mentioned first first embodiment of the invention.

Overall side view of riding rice transplanter Overall plan view of riding rice transplanter Overall front view of riding rice transplanter Side view of the vicinity of the engine, hydrostatic continuously variable transmission and transmission case Plan view showing right and left front wheels, right and left rear wheels, mission case, etc. Schematic plan view showing a state in which the steering handle and the rack gear are operated to the straight advance position and the left steering limit Longitudinal side view near the front of the mission case Longitudinal front view around the case, pinion gear and rack gear Front view of the vicinity of the mission case and right and left wheel support cases Transverse plan view near the front of the mission case Longitudinal side view near the resistance member at the rear of the mission case The front view of the vicinity of the mission case of the 1st another form of implementation of the invention, the right and left wheel support case A cross-sectional plan view of the vicinity of the front of the mission case according to the first alternative embodiment

Explanation of symbols

1 Front wheel 2 Rear wheel 27 Side clutch
54 knuckle arm 58 linkage rod
P1 Vertical axis

Claims (1)

The right side clutch that can transmit and shut the power transmitted to the right rear wheel is provided on the right side of the fuselage behind the right and left knuckle arms that rotate the right and left front wheels around the vertical axis respectively. the transmission and cutoff freely left side clutch power transmitted to the rear wheel of the left, along with provided on the left side of the fuselage at the rear side of the right and left knuckle arms,
Wherein a right knuckle arm over the left side clutch connecting the linkage rod, to connect the linkage rod over said left knuckle arm and the right side clutch,
When the right and left front wheels are steering operation to the right, the left of the right side clutch via said linkage rod knuckle arm is operated to cut-off state, steering operation right and left front wheel to the left Once, riding work vehicle in which the left side clutch via said linkage rod by the right knuckle arms are configured to be operated to cut-off state.

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