JP4297924B2 - Riding machine - Google Patents

Description

  FIG. 1 shows a riding rice transplanter as an example of a riding agricultural machine to which the present invention is applied. In this riding rice transplanter, a four-row seedling planting device 5 can be moved up and down via a hydraulically driven link mechanism 4 at the rear of a four-wheel drive type traveling machine body 3 having a front wheel 1 and a rear wheel 2. Concatenated. As shown in FIGS. 1 and 3, an engine 6 is mounted on the front portion of the traveling body 3, and the output of the engine 6 is transmitted to a transmission case 7 that pivotally supports the front wheels 1 via a belt transmission device 8. The gear is changed by 7 and the front wheel 1 is driven. The output extracted from the transmission case 7 is transmitted to the rear transmission case 9 that pivotally supports the rear wheel 2, and the working power extracted from the transmission case 7 is transmitted to the seedling planting device 5.

  As shown in FIGS. 3 and 4, a pitman arm 11 swinging left and right around the axis a by the steering handle 10 is provided in a cantilevered manner at the bottom of the mission case 7. The front knuckle arms 12 of the front wheels 1 and the left and right front wheels 1 are interlocked and connected by tie rods 13 to form a steering link mechanism 14 for the front wheels 1.

  As shown in FIG. 3 and FIG. 6, a sprocket 15 as a rotating member is connected to the lower end portion of the pitman arm 11 concentrically with the shaft center a, and as a rotating operation member at a position on the front side of the pitman arm 11. The operation sprocket 16 is rotatably provided around an axis b parallel to the axis a, and the sprocket 15 and the operation sprocket 16 are wound and interlocked by a chain 17 as an interlocking member.

  As shown in FIGS. 6 and 7, the operation sprocket 16 is rotatably supported by a fixed boss 19 fixed to the traveling machine body 3 side, and a spline fitting or key fitting is performed on the operation sprocket 16 at the center of the fixed boss 19. The combined operation shaft 20 is inserted so as to be vertically slidable. The upper portion of the operation shaft 20 is supported by a fixed boss 22 via a rotation boss 21, and a rotation bracket 23 extending forward from the rotation boss 21 is connected to the axis b so as to be rotatable left and right. . A balance arm 24 is supported so as to be rotatable up and down around a lateral axis c of the rotating bracket 23, and the rear end of the balance arm 24 and the operation shaft 20 are connected by a pin 25, and the axis c of the balance arm 24 is connected. The operation shaft 20 is slid up and down along the axis b along with the surrounding vertical rotation. A steering lever 26 is connected around a horizontal axis d of the front end portion of the balance arm 24 so as to freely swing up and down, and the steering lever 26 is moved to an arbitrary lifting position by a disc spring or the like provided on the axis d. It is configured to be held by.

  As shown in FIGS. 6 and 7, the proximal end portion of the steering lever 26 is provided with a contact portion 26a that goes around the lower end of the front end portion of the balance arm 24. As shown in FIG. When 26 is tilted forward by a predetermined angle α from a substantially vertical standing posture, the contact portion 26 a comes into contact with the front end portion of the balance arm 24 from below, and the steering lever 26 is further moved against the balance arm 24. Unable to fall forward. As shown in FIG. 3, when the steering lever 26 is tilted forward in a range of a predetermined angle β larger than the predetermined angle α, the balance arm 24 integrated with the steering lever 26 rotates around the axis c. Thus, the rear end portion of the balance arm 24 moves upward, and the operation shaft 20 is slid upward.

  As shown in FIG. 6, a disk 28 having a pair of pins 27 erected upward is fixed to the lower end of the operation shaft 20, and an engagement hole 29 facing the pin 27 is provided in the operation sprocket 16. In a state where the operation shaft 20 is slid downward, the pin 27 is detached from the engagement hole 29, the linkage between the operation shaft 20 and the operation sprocket 16 is broken, and the operation shaft 20 is slid upward. As a result, the pin 27 engages with the engagement hole 29 and the operation shaft 20 and the operation sprocket 16 are connected.

  As described above, when the steering lever 26 is set to the upright posture, the linkage between the operation shaft 20 and the operation sprocket 16 is broken, and when the steering lever 26 is tilted forward within the range of the predetermined angle β, the operation shaft 20 A linkage interrupting mechanism 30 is configured to connect the operation sprocket 16 and the operation sprocket 16.

  As a result, in a state where the steering lever 26 is tilted forward by a predetermined angle α or more and the operating shaft 20 and the operating sprocket 16 are connected, the steering lever 26 is swung to the left and right, so that the steering bracket 26 is moved together. The operation shaft 20 rotates to rotate the operation sprocket 16, and the rotation of the operation sprocket 16 is transmitted to the sprocket 15 by the chain 17, so that the pitman arm 11 is forced in the same direction as the operation direction of the steering lever 26. To be operated.

  As shown in FIGS. 6, 7, and 8, the bottom of the balance arm 24 is provided with a lock shaft 32 that is rotated around the longitudinal axis e by a lever 31 that vertically penetrates the rotation bracket 23. The lock claw 33 at the upper end of 32 is configured to be switched to a locked state where the lock claw 33 is engaged with the upper surface of the rotation bracket 23 and a lock release state where the lock claw 33 faces the central space of the rotation bracket 23. Therefore, when the steering shaft 26 is set in the standing posture and the linkage between the operating shaft 20 and the operating sprocket 16 is cut off, the lock shaft 32 is rotated to the locked state as shown in FIG. 24 cannot be rotated in the direction in which the operating shaft 20 is pulled up. During normal boarding maneuvering, the steering lever 26 is set to a standing posture and locked, so that even if the pitman arm 11 is operated to the left and right by maneuvering with the steering handle 10, the operation sprocket 16 is merely idled. Thus, the operation shaft 20 is not operated.

  As shown in FIG. 10, when the traveling machine body 3 is put in and out of the field through a slope having a relatively steep slope, or when the traveling machine body 3 is loaded onto or unloaded from a truck bed using a step board, the traveling machine body 3 is used. When maneuvering with a large forward / backward inclination, the lever 31 is unlocked by the lever 31 and the steering lever 26 is tilted forward to a predetermined angle α or more to operate the operating shaft 20 and the operating sprocket. 16 and an operator standing on the ground in front of the traveling machine body 3 swings the steering lever 26 to the left and right to forcibly operate the pitman arm 11 to move the traveling machine body 3 at an extremely low speed. While steering in the desired direction. When the disk 28 comes into contact with the lower surface of the operation sprocket 16, the steering lever 26 can no longer fall down. In this state, the push-down force of the steering lever 26 is transmitted to the front part of the traveling body 3 to travel. It is possible to maneuver while preventing the front part of the body 3 from being lifted.

  As shown in FIGS. 6 and 9, a check pin 35 protrudes rearward from the upper end of the operation shaft 20, and a V-shaped guide recess 37 is formed in the check fitting 36 provided on the traveling machine body 3 side. . As a result, when the steering lever 26 is set to the upright posture while sliding the operating shaft 20 downward, the steering lever 26 is directed immediately before the traveling machine body 3 (the pitman arm 11 is traveling straight ahead). Thus, the steering lever 26 is in the standing posture.

  In the case of steering from the ground using the steering lever 26, the following structure is provided in order to stop the traveling machine body 3. As shown in FIGS. 2 and 4, a main clutch pedal 41 is provided at the left front portion of the driving step 40 of the traveling machine body 3, and a pair of left and right steering pedals 42 are provided at the right front portion of the driving step 40. The steering pedal 42 and the left and right side clutches / brakes 43 provided in the rear transmission case 9 are independently linked by a rod 44.

  As shown in FIGS. 2, 4, and 5, the main clutch lever 45 extends forward from the main clutch pedal 41, and the main clutch pedal 41 can be manually cut from the front portion of the traveling machine body 3. . A linkage shaft 46 that rotates in conjunction with the clutch disengagement operation of the main clutch pedal 41 is provided, and the right end of the linkage shaft 46 and the left and right steering pedals 42 are linked via a linkage bracket 48 having a long hole interchange 47. When the main clutch pedal 41 is disengaged, the left and right steering pedals 42 are operated in the depression direction via the linkage bracket 48, and the left and right side clutches and brakes 43 are simultaneously operated, so that the aircraft is stopped. Is called. The main clutch pedal 41 can be locked and fixed at the stepping operation position by a lock lever 49, and is used when the traveling machine body 3 is stopped in an inclined state.

  As shown in FIGS. 2 and 3, a loop-shaped handle portion 26 a is formed at the tip of the steering lever 26, and the traveling body 3 is moved back and forth by holding the handle portion 26 a of the steering lever 26 in the lying posture. It can be easily pushed and pulled. The steering lever 26 is provided with a sighting tool 50 for visually confirming the advancing direction of the traveling machine body 3 at the time of planting traveling work. The sighting tool 50 can be folded during ground operation with the steering lever 26 set in a lying posture. Fold it back and use it. As shown by a two-dot chain line in FIG. 3, during maintenance for opening and closing the engine bonnet 51 and inspecting and maintaining the engine 6, the sighting tool 50 is raised and used to lock and hold the engine bonnet 51 in the open posture. You can also

[Another Embodiment of the Invention]
The present invention can also be implemented in the following forms.

(1) As shown in FIG. 11, an engagement pin 61 that can be inserted into and removed from the balance arm 24 is provided, and a plurality of engagement holes 62 into which the engagement pins 61 are inserted into the rotation bracket 23 are arranged with the axis c. By forming the balance arm 24 and the steering lever 26 integrally with each other, the steering lever 26 can be fixed and used in a plurality of lying postures. Accordingly, it is possible to operate the steering lever 26 by applying a force in the vertical direction while operating the steering lever 26 sideways.

(2) As shown in FIG. 12, a main clutch lever 64 linked to the main clutch pedal 41 via a wire 63 is provided near the handle portion 26a of the steering lever 26, and the handle portion 26a and the main clutch lever 64 are provided. It is convenient to configure so that the traveling machine body 3 can be stopped by performing a joint grip operation.

(3) As shown in FIG. 13, the operating arm 24a extending left and right from the balance arm 24 and the side clutch and brake 43 of the left and right rear wheels 2 are linked by a wire 65, and the steering lever 26 is moved straight. When the front wheel 1 is steered by operating to the left or right beyond the set angle, the side clutch / brake 43 of the rear wheel 2 inside the steer is operated and the rear wheel 2 inside the steer is stopped. May be. As a result, it is possible to control the traveling machine body 3 with a small turn from the ground. In this case, when the steering lever 26 is operated to the left or right from the straight traveling position by a set angle or more, only the side clutch of the rear wheel 2 may be turned off.

(4) In a model in which the left and right rear wheels 2 are driven via the differential mechanism and the side brake, if the steering lever 26 is operated from the straight advance position to the left or right by a set angle or more, the side brake of the rear wheel 2 inside the steering is released. It is also possible to make a small turn during ground maneuvering by braking.

(5) The sprocket 15 as a rotation member that rotates integrally with the pitman arm 11 and the operation sprocket 16 as a rotation operation member that rotates by the steering lever 26 are changed to gears, and the sprocket 15 and the operation sprocket 16 are changed to intermediate gears. Thus, the pitman arm 11 can be rotated in the operation direction of the steering lever 26. The pivoting member that rotates integrally with the pitman arm 11 and the pivoting operation member that rotates by the steering lever 26 are constituted by an arm member, and the steering lever 26 can also be connected by connecting the sprocket 15 and the operating sprocket 16 with a rod. It is possible to operate the pitman arm 11 in the operating direction.

Overall side view of riding rice transplanter Perspective view of the front of the traveling aircraft Side view of the front of the traveling aircraft Schematic plan view of the control system of the traveling aircraft Side view of the main clutch pedal and steering pedal operating system Longitudinal side view near the base of the steering lever Cross-sectional plan view near the base of the steering lever Longitudinal front view near the base of the steering lever Rear view near the base of the steering lever Side view showing the state during ground control Vertical side view of the vicinity of the base of the steering lever in another embodiment of the invention The top view of the vicinity of the steering lever in another embodiment of the invention Schematic plan view of a control system for a traveling aircraft in another embodiment of the invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front wheel 2 Rear wheel 3 Traveling machine body 26 Steering operation tool 45 Main clutch lever
d Horizontal axis

Claims (6)

A steering operation tool is provided at a front portion of the traveling machine body, and a first state in which a steering operation of a front wheel can be performed from the ground in front of the traveling machine body by the steering operation tool, and a front part of the traveling machine body by the steering operation tool. Set the second state where the steering operation of the front wheels is impossible from the ground,
The steering operation tool is pivotably supported around the horizontal axis of the front part of the traveling machine body so that the steering operation tool can be tilted forward, and the steering operation tool is interlocked with the swinging operation according to the tilt angle of the steering operation tool. A riding-type agricultural work machine configured to switch between the first and second states. The lodging angle corresponding to laid down angle and the second state corresponding to said first state, riding agricultural machine according to claim 1 which is fixed can configure the steering operation member. In the second state, riding agricultural machine according to claim 1 or 2, wherein before in conjunction with the rocking operation of the steering operating tool Kimisao direction manipulation tool is are configured to be held in the straight-ahead position .   The riding type farm working machine according to any one of claims 1 to 3, wherein in the second state, the steering operation tool is configured to be able to push down a front portion of a traveling machine body.   5. The structure according to claim 1, wherein when the steering operation tool is operated more than a set value from the straight position to the left and right, the side clutch of the rear wheel inside the steering is operated to be cut off. The riding type agricultural working machine described.   The riding type farm working machine according to any one of claims 1 to 5, wherein a main clutch lever capable of stopping the machine is provided at a front portion of the traveling machine.

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