JP2008212073A - Walking-type working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that an attachment and a tail wheel body for movement interfere with each other in work performed by mounting the attachment in the rear of a tilling section. <P>SOLUTION: In the walking-type working machine 1, the tilling section 6 for tilling soil along with the traveling of a machine body is equipped with a ground contact member such as a tail sleigh 16 for regulating the plowing depth of the tilling section 6 by contact with the ground. The tail sleigh 16 is fitted with the tail wheel body 17 for movement, which lifts the tilling section 6 from a soil surface or a road surface during non-operations. When the tail wheel 17 can switch between such an action attitude as to protrude downward with respect to the lower end of the tail sleigh 16, and such a nonaction attitude as to recede upward with respect to the lower end thereof, it switches between the action attitude and the nonaction one by being rotated on the longitudinally-directed rotational axis (rotating shaft 18). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a walk-type work machine such as a walk-type management machine, and more particularly, to a walk-type work machine provided with a moving tail wheel that floats a tillage unit from a soil surface or a road surface during non-working movement.

2. Description of the Related Art A walking work machine is known that includes a moving tail wheel that floats a tillage unit from a soil surface or a road surface during non-working movement (see, for example, Patent Documents 1 and 2). This type of tail wheel is usually a grounding member provided near the rear of the tillage part (plowing depth adjusting member that adjusts the tilling depth of the tilling part by grounding, or resistance for preventing dashing that provides running resistance by grounding). And can be transformed into a working posture projecting downward from the lower end of the grounding member and a non-working posture retracting upward from the lower end of the grounding member. For example, in the walking type working machine of Patent Document 1, the tail wheel body is made detachable, and can be mounted above the tillage portion when unnecessary. Further, in the walking type working machine of Patent Document 2, the tail wheel body is supported so as to be rotatable up and down, and the tail wheel body can be held in the working posture and the non-working posture by selective rotation locking by a lock pin. It is.
Japanese Patent Laid-Open No. 2004-313006 JP 2006-246775 A

  Compared with the detachable tail wheel body shown in Patent Document 1, the rotating tail wheel body shown in Patent Document 2 is easier to switch the posture and loses the tail wheel body. Although it is excellent in that there is no worry, the tail wheel body of Patent Document 2 is largely retracted upward while maintaining a posture perpendicular to the ground when in a non-acting posture. In the work performed by attaching the attachment, there was a problem that the tail wheel body and the attachment interfered with each other.

The present invention was created to solve these problems in view of the above circumstances, and adjusts the tilling depth of the tilling portion by grounding to the tilling portion that tills the soil as the aircraft runs. In the walking type working machine including a grounding member that functions as a plowing depth adjusting member or a dashing-preventing resistance member that imparts running resistance by grounding, the plowing portion is placed on the soil surface or road surface when the non-working movement is performed on the grounding member Attach a moving tail wheel body that floats from the top and switch the posture of the tail wheel body between a working posture that projects below the lower end of the grounding member and a non-working posture that retreats above the lower end of the grounding member In making it possible, the tail wheel body is switched between an action posture and a non-action posture by turning around a turning axis that faces forward and backward. In this way, when the tail wheel is in a non-acting posture, the tail wheel is not retracted upward while maintaining a vertical posture, but the tail wheel is retracted upward while approaching a horizontal posture. Therefore, the height of the upper end of the tail wheel body in the non-acting posture can be kept low. Thereby, the problem that a tail wheel body and an attachment interfere in the operation | work which attaches an attachment to the back of a tilling part and can be solved can be eliminated.
In addition, when providing the rotation lock means for locking the rotation of the tail wheel body, the rotation lock means is configured to rotate the tail wheel body in a non-acting posture at a position where the tail wheel body is substantially parallel to the ground. It is characterized by locking with. In this way, the upper end height of the tail wheel body in the non-acting posture can be suppressed to substantially the same height as the rotational axis of the tail wheel body, so interference between the tail wheel body and the attachment can be avoided more reliably. can do.

  Next, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a walking type working machine, and the walking type working machine 1 includes a mission case 2 having a letter shape substantially in side view, which is also used as a body frame. A wheel 4 is pivotally supported on both the left and right sides of the front end portion of the mission case 2 via an axle 3, and a rotary plow shaft 5 is provided at the rear end portion of the mission case 2 and extends to the left and right outer sides. A formula tiller 6 is constructed. The walking type working machine 1 of this embodiment is a wheel type that travels by driving the wheels 4, but it goes without saying that the present invention can also be implemented in a crawler type walking type working machine that travels by driving the crawler. .

  An engine 7 is mounted on the upper part of the mission case 2, and the power generated by the engine 7 is input to the mission case 2 via a main clutch (not shown) formed of a tension clutch. The transmission case 2 includes a transmission including a travel speed change mechanism (not shown) for shifting the travel power and a work speed change mechanism (not shown) for shifting the work power. Thereby, the mission case 2 of the present embodiment is used both as a traveling transmission case that transmits driving force from the engine 7 to the wheels 4 and a work transmission case that transmits driving force from the engine 7 to the tilling unit 6.

  A handle 9 is attached to the rear part of the mission case 2 via a handle bracket 8. The handle 9 extends rearward and upward from the traveling machine body, and the rear end portion thereof is gripped by the operator. In addition, a clutch lever 10 is provided at the rear end portion of the handle 9 for operating on / off of the main clutch. By operating the clutch lever 10, the driving of the wheel 4 and the tillage unit 6 can be turned on / off. It becomes possible.

  In addition, a base end portion of the transmission lever 11 that is allowed to operate in the front-rear direction and the left-right direction is connected and supported at the upper portion of the transmission case 2, and the distal end side thereof is directed rearward and upward (operator side). It has been extended. The base end portion of the speed change lever 11 is connected to a travel speed change mechanism and a work speed change mechanism in the mission case 2 via a connection mechanism (not shown). The mechanism is shifted.

  In addition to the rotary tilling shaft 5 described above, the tilling portion 6 includes a tilling claw 13 provided on the rotary tilling shaft 5, a rotary cover 14 that covers the top of the tilling claw 13, and a rear end portion of the rotary cover 14 that can swing up and down. Are provided with a rear cover (rubber plate) 15 and a tail sled (grounding member, tillage adjusting member) 16 provided on the rotary cover 14 so that the vertical position can be changed. The tail sled 16 regulates the tilling depth of the tilling unit 6 by sliding in the farm scene, and the tilling depth can be adjusted by changing the vertical position thereof. In addition, an arbitrary attachment (not shown) can be attached to the rear of the tilling unit 6 according to the type of work to be performed.

  The tail sled 16 is attached with a tail ring body 17 for moving the tiller 6 from the soil surface or road surface during non-working movement. The tail wheel body 17 can be transformed into an action posture that projects downward from the lower end of the tail sled 16 and a non-action posture that retreats above the lower end of the tail sled 16. The two positions are switched.

  As shown in FIGS. 2 and 3, the tail wheel body 17 of the walking work machine 1 according to the present invention has an action posture by turning around a turning axis (turning shaft 18) facing forward and backward. It can be switched to a non-acting posture. In this way, when the tail wheel body 17 is in a non-acting posture, the tail wheel body 17 is not retracted upward while maintaining a vertical posture, but the tail wheel body 17 is moved upward while approaching a horizontal posture. Since it can be made to retract, the upper end height of the tail wheel body 17 in the non-acting posture can be kept low. Thereby, the problem that the tail wheel body 17 and the attachment interfere with each other in the work performed by attaching the attachment to the rear of the tillage unit 6 can be solved.

  Further, when providing the rotation lock means for locking the vertical rotation of the tail wheel body 17, the rotation lock means allows the tail wheel body 17 to rotate in the non-acting posture, and the tail wheel body 17 is substantially parallel to the ground. It is preferable to lock at the position. In this way, the height of the upper end of the tail wheel body 17 in the non-acting posture can be suppressed to substantially the same height as the rotational axis of the tail wheel body 17, so that interference between the tail wheel body 17 and the attachment can be further reduced. It can be avoided reliably.

  Next, specific configurations of the tail wheel body 17 and the rotation lock means will be described with reference to FIGS. As shown in these drawings, the tail wheel body 17 is provided at the rear end portion of the rotating shaft 18 facing front and rear. The rotation shaft 18 is supported by a boss 19 provided on the tail sled 16 so as to be rotatable and slidable back and forth. The rotation of the tail wheel body 17 is achieved by rotation about a rotation axis that faces front and rear. Switch between working posture and non-working posture.

  A rotation lock portion 18 a having a non-circular cross section is integrally provided at the front end portion of the rotation shaft 18. As long as the rotation lock part 18a has a non-circular cross section, it may have a prismatic shape as shown in FIG. 5A or a gear shape as shown in FIG. On the other hand, the front portion of the boss 19 has a rotation lock hole 19a in which the rotation lock portion 18a of the rotation shaft 18 can be fitted from the front and restricts the rotation of the fitted rotation lock portion 18a. Is formed. In other words, the rotation lock portion 18a of the rotation shaft 18 is normally fitted in the rotation lock hole 19a of the boss 19, and the tail wheel body 17 is in the working posture by the rotation restriction by the rotation lock hole 19a. Alternatively, it is held in a non-acting posture. Further, when the posture of the tail wheel body 17 is switched, the rotation shaft 18 is slid forward, and the rotation lock portion 18a is removed from the rotation lock hole 19a. Thereby, the rotation of the rotation shaft 18 is allowed, and the posture of the tail wheel body 17 can be switched. Then, after switching the posture switching of the tail wheel body 17, the rotation shaft 18 is slid rearward, and the rotation lock portion 18a is again fitted into the rotation lock hole 19a. Note that the tail wheel body 17 of the present embodiment can be held not only in a non-action posture rotated by 90 ° with respect to the action posture, but also in a non-action posture rotated by 180 °. A non-operation posture (for example, 45 °, 90 °, 135 °, 180 °) may be set so that an arbitrary non-operation posture can be selected.

  When the rotation lock means of the tail wheel body 17 is configured as described above, it is preferable to bias the rotation shaft 18 backward using a spring 20 or the like. For example, a spring 20 formed of a compression coil spring is interposed between a washer 21 attached to the rotation shaft 18 at an intermediate portion and a rear end surface of the boss 19. In this case, the inconvenience that the rotation lock portion 18a unintentionally comes out of the rotation lock hole 19a and the tail wheel body 17 rotates is solved. The urging force of the spring 20 is set in a range that allows the operator to slide the rotating shaft 18 when the posture of the tail wheel body 17 is switched.

  Further, it is preferable that the rotation lock means constituted by the front end side of the rotation shaft 18, that is, the rotation lock portion 18 a, the rotation lock hole 19 a, the spring 20, the washer 21, etc. is entirely covered with the cover body 22. For example, bellows-like rubber boots are provided before and after the boss 19 to cover the front end side of the rotating shaft 18. If it does in this way, it will prevent that mud etc. adhere to the rotation lock means comprised in the front end side of rotation axis 18, and the trouble resulting from adhesion of mud etc. can be avoided.

  In the present embodiment, the plowing depth adjustment of the tilling unit 6 based on the height change of the tail sled 16 can be easily performed by operating the operation lever 23 provided on the handle 9. That is, the slide support portion 24 of the tail sled 16 is provided with a stopper pin 25 that appears and disappears in response to the operation of the operation lever 23, and the stopper pin 25 is urged by the spring 26 toward the tail sled 16 so that the tail sled 16 By selectively engaging the stopper pin 25 with the plurality of engaging holes 16a formed in the rear, the tail sled 16 is slide-locked at an arbitrary height. In this way, while holding the operation lever 23 (with the stopper pin 25 pulled out from the engagement hole 16a), the tail pin 16 is slid to an arbitrary height, and then the operation lever 23 is released, the stopper pin 25 is released. Since it engages with the nearby engagement hole 16a, the height adjustment of the tail sled 16 can be easily completed. In the figure, reference numeral 27 denotes a wire cable for connecting the stopper pin 25 and the operation lever 23 together.

  According to the present embodiment configured as described, the walking type work is provided with the grounding member such as the tail sled 16 that adjusts the plowing depth of the tilling unit 6 by the grounding to the tilling unit 6 that tills the soil as the aircraft runs. In the machine 1, a tail wheel body 17 is attached to the tail sled 16 for moving the tiller 6 from the soil surface or the road surface during non-working movement, and the tail wheel body 17 is positioned more than the lower end of the tail sled 16. In order to switch between a working posture projecting downward and a non-working posture retracting upward from the lower end of the tail sled 16, the tail wheel body 17 has a pivot axis (rotating shaft 18) facing front and rear. Since it is switched between the action posture and the non-action posture by turning around the center, when the tail wheel body 17 is set to the non-action posture, the tail wheel body 17 is retracted upward while maintaining the vertical posture. Rather than close the tail wheel body 17 to a horizontal posture It can be retracted to want upward. Thereby, the upper end height of the tail wheel body 17 in the non-acting posture is kept low, and the problem that the tail wheel body 17 and the attachment interfere with each other in the work performed by attaching the attachment to the rear of the tillage unit 6 can be solved. .

  Further, when providing the rotation lock means for locking the rotation of the tail wheel body 17, the rotation lock means allows the tail wheel body 17 to rotate in the non-acting posture so that the tail wheel body 17 is substantially parallel to the ground. Therefore, the upper end height of the tail wheel body 17 in the non-acting posture can be suppressed to substantially the same height as the rotational axis of the tail wheel body 17, and as a result, the tail wheel body 17 and the attachment Interference can be avoided more reliably.

  Of course, the present invention is not limited to the above-described embodiment. For example, the tail wheel body is provided on a grounding member such as a resistance member (resistance rod) for preventing dashing that imparts running resistance by grounding. Also good.

[Reference example]
Next, a walking work machine according to a reference example will be described with reference to FIG. As shown in this figure, as shown in this figure, in the walking type work machine according to the reference example, when the tail wheel body 102 is provided on the tail sled 101, the tail wheel body 102 is provided with a rotation axis that faces left and right. Switching between a working posture and a non-working posture is performed by turning around the center. The tail wheel body 102 is always urged upward by a spring 103 and is connected to an operation lever 106 of a handle 105 via a wire cable 104. That is, the tail wheel body 102 of the reference example is held in the non-acting posture by the biasing force of the spring 103, and when switching to the acting posture, the tail wheel body 102 is rotated downward by grasping the operation lever 106. The position of the operation lever 106 is locked by the lock plate 107. According to such a tail wheel body 102, it is possible to easily switch between the action posture and the non-action posture by operating the operation lever 106 provided on the handle 105. Since the rotation is centered on the rotation axis that faces, the working posture and the non-working posture are switched, so that the tail wheel body 102 and the attachment interfere with each other when the attachment is attached to the rear of the tillage unit. There is a problem.

It is a side view of a walk type work machine. It is a principal part side view which shows a tail wheel body and a rotation lock means. It is a principal part rear view which shows a tail wheel body and a rotation lock means. It is principal part sectional drawing which shows a tail wheel body and a rotation lock means. (A) is a perspective view of a rotating shaft and a tail wheel body, (B) is a perspective view showing another example. It is sectional drawing of a tail warp height adjustment part. It is a principal part side view of the walk type work machine concerning a reference example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Walking type work machine 4 Wheel 6 Tilling part 16 Tail warp 17 Tail wheel body 18 Rotating shaft 19 Boss 20 Spring 22 Cover body

Claims (2)

A plowing section that plows soil as the machine travels is provided with a plowing depth adjusting member that adjusts the plowing depth of the plowing part by grounding or a grounding member that functions as a resistance member for preventing dashing that provides running resistance by grounding. In walking type work machines,
The grounding member is attached with a moving tail wheel body that floats the tillage part from the soil surface or road surface during non-working movement, and the posture of the tail wheel body is an action posture that projects downward from the lower end of the grounding member; In order to be able to switch to a non-acting posture that retreats above the lower end of the grounding member, the tail wheel body is switched between an acting posture and a non-acting posture by pivoting about a pivot axis that faces forward and backward. This is a walking work machine.   In providing rotation lock means for locking the rotation of the tail wheel body, the rotation lock means locks the rotation of the tail wheel body in a non-acting posture at a position where the tail wheel body is substantially parallel to the ground. The walking type work machine according to claim 1, wherein:

Images