JP4485912B2 - Walking type work machine - Google Patents

Description

  The present invention relates to a walking-type working machine such as a walking-type tiller and a walking-type management machine provided with a resistor that prevents a so-called dashing phenomenon.

2. Description of the Related Art A walking type work machine is known in which an extension portion extending rearward and downward is formed in a transmission case that supports wheels, and a tilling claw shaft is pivotally supported at a tip portion of the extension portion. In general, this type of walking work machine is provided with a resistor that enters the soil and gives resistance to the vehicle running in order to prevent a so-called dashing phenomenon (see, for example, Patent Documents 1 and 2).
JP-A-6-153602 JP-A-8-317705

  However, the walking type tiller described in Patent Document 1 has a problem that the resistor is enlarged because the resistor is provided at the rear part of the rotary cover. On the other hand, in the management machine described in Patent Document 2, since the resistor (dash prevention member) is provided in the extension part (rotary case) of the mission case, the resistor can be reduced in size.

  However, since the resistor shown in Patent Document 2 is provided at the front part of the extending part, there is a problem that when the external force F is received from the front, rattling is likely to occur. That is, as shown in FIG. 7, when an external force F acts on the resistor 100 from the front, a force to rotate the bracket 101 in the A direction acts on the lower side of the bracket 101 that supports the resistor 100 as a fulcrum. Since this force acts in a direction in which the upper side of the bracket 101 is pulled away from the extending portion 102, play is likely to occur.

  Further, if the resistor 101 is provided at the front or lower end of the extension portion 102, residue, grass, soil, etc. are likely to accumulate in the shaded area shown in FIG. 8, and stable work traveling is hindered. There is also a problem that. This becomes more prominent as the plowing depth increases, and there is a disadvantage that the plowing depth is substantially limited.

The present invention was created in view of the above-described circumstances in order to solve these problems, and the invention of claim 1 is directed to a transmission case that supports a wheel in a front- rear direction. A walking-type work machine that extends in a rear lower shape and forms an extended portion having a circular arc at the lower end of the lower end, and has a tilling claw shaft pivotally supported at the lower end of the extended portion. In providing a resistor that enters the soil and gives resistance to airframe travel at the exit part , the extension part is provided with an inclined part that inclines in front and rear and low in a posture along the rear lower part of the extension part; A bracket having a bent portion bent downward from the inclined portion along the arcuate tip edge of the extending portion is fixed, and a resistor enters the soil into the bent portion. In the state where resistance is applied to the aircraft, the position of the bottom of the bracket is directly behind the tilling claw axis and the rotation trajectory of the tilling claw It provided a boss integrally so as to be positioned in a walk-behind working machine, characterized in that supporting the resistor to the boss.
If comprised in this way, not only the backlash of a resistor can be prevented but accumulation of residue, grass, soil, etc. to a resistor can also be controlled.

  Next, embodiments of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a walk-type field cultivator (walk-type work machine), and the walk-type field cultivator 1 is provided on a mission case 3 that pivotally supports a pair of left and right wheels 2 and on the front side of the mission case 3. The engine 4 includes a tiller 5 provided on the rear side of the transmission case 3 and a handle 6 extending rearward and upward from the transmission case 3.

The mission case 3 is made of, for example, aluminum die casting, and as is apparent from the description of FIGS. The extended portion 3a is formed in the shape of the letter “he” in side view as a whole. The extension portion 3a of the mission case 3 also serves as a support frame and a transmission case for the tillage portion 5, and both left and right side surfaces are covered with a protector (protective cover) 7 made of a metal plate (pressed product).

  The tilling part 5 includes a tilling claw shaft 8 extending left and right from the tip of the extending part 3 a, a plurality of tilling claws 9 attached to the tilling claw shaft 8, and a rotary cover 10 that covers the top of the tilling claw 9. And a tail wheel 11 provided at the rear end of the rotary cover 10 so that the vertical position can be adjusted, and a resistor 12 provided at the tip of the extending portion 3a. The tilling claw 9 tills the soil according to the rotation.

  The resistor 12 is provided to prevent a so-called dashing phenomenon. The dashing phenomenon is a phenomenon in which the airframe starts suddenly by the tilling reaction force received by the tilling claws 9, and the resistor 12 enters the soil to give resistance to the airframe traveling, thereby suppressing the dashing phenomenon. Hereinafter, the arrangement of the resistor 12 and the support structure, which are characteristic of the present invention, will be described in detail.

The resistor 12 according to the present embodiment has a rod shape, and is provided on the extending portion 3 a via the bracket 13. Bracket 13 has a U-shaped section, as is apparent from FIG. 5, a plurality of locations in a posture along the bottom portion after the extended portion 3a is bolted. At this time, as is apparent from FIG. 5, the bracket 13 has an inclined portion 13 b that inclines in a front, rear, and lower shape in a posture along the rear lower portion of the extending portion 3 a and an arcuate tip portion of the extending portion 3 a. A bent portion 13c that is bent downward from the inclined portion 13b and a boss 13a that extends rearward from the bent portion 13c are formed, and the extended portion 3a. In addition, the rear end portion of the protector 7 is sandwiched, and the bracket 13, the extending portion 3 a, and the bolt 14 penetrating the protector 7 are fixed together. As is apparent from FIG. 5, the resistor 12 is supported at a position directly behind the tillage claw shaft 8 at the lower end of the bracket 13 in a state where the resistor 12 enters the soil and gives resistance to the vehicle running. It has come to be.

If it does in this way, the resistor 12 will be supported by the rear part of the extension part 3a. In this case, as above-mentioned, the boss | hub 13a is provided in the bending part 13c, but it is clear from FIG. As shown in FIG. 5, when the external force F acts from the front , the boss 13a is provided on the lower side of the bracket 13 that supports the resistor 12 as shown in FIG. A force to rotate the bracket 13 in the direction B acts as a fulcrum. This force acts in a direction in which the upper side of the bracket 13 is pressed against the rear part of the extension part 3a and the protector 7, so that not only can the backlash of the resistor 12 be prevented, but also the support strength of the resistor 12 can be increased.

  Further, when the resistor 12 is provided at the rear portion of the extending portion 3a, there is an advantage that accumulation of residue, grass, soil, etc. on the resistor 12 is suppressed as compared with the case where the resistor 12 is provided at the front portion of the extending portion 3a. . In particular, as shown in FIG. 1, in a side view, the resistor is located in a region below the lower tangent C of the wheel 2 and the extension 3a and behind the front tangent D of the extension 3a. When 12 is arranged, it is possible to limit the area where residue, grass, soil, and the like are accumulated to the shaded portion, and to perform stable work traveling. Specifically, it is possible not only to avoid plowing depth limitation due to accumulation of residue, grass, soil, etc., and to increase handle load, but also to reduce horsepower loss and tire slip.

  In the present embodiment, the resistance applied to the airframe travel can be adjusted based on the change in the vertical position of the resistor 12. Specifically, a boss 13a facing the up-and-down direction is integrally provided at the lower end of the bracket 13, and the resistor 12 is inserted into the boss 13a so as to be slidable in the up-and-down direction, and is further screwed into the boss 13a. Then, the resistor 12 is fixed at an arbitrary position, and the nut 16 is used to prevent loosening. In addition, if a plurality of recesses 12a (striking portions) that engage with the tips of the bolts 15 are formed in the resistor 12, the positioning and holding of the resistor 12 is ensured.

  The walking type tiller 1 configured as described includes a mission case 3 that supports a wheel 2 and an extension portion 3a that extends rearward and downward, and a tip portion of the extension portion 3a has a tilling claw shaft. 8, the resistor 12 is supported by the rear portion of the extending portion 3a when the extending portion 3a is provided with a resistor 12 that enters the soil and gives resistance to the vehicle running. Therefore, not only can the backlash of the resistor 12 be prevented, but also accumulation of residues, grass, soil, etc. on the resistor 12 can be suppressed.

  Further, the resistor 12 is disposed in a region below the lower tangent C of the wheel 2 and the extension 3a and in the rear side of the front tangent D of the extension 3a in a side view. Further, it is possible to more effectively suppress the accumulation of residues, grass, soil, and the like on the resistor 12 and perform stable work traveling.

It is a side view of a walking type tiller. It is a top view of a walking type tiller. It is a side view of a mission case. It is a rear view of a tillage part. It is a side view which shows the support structure of a resistor. It is a rear view which shows the support structure of a resistor. It is a side view of the resistor which shows a prior art example. It is a side view of the walking type tiller which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Walking type tiller 2 Wheel 3 Mission case 3a Extension part 5 Tilling part 7 Protector 8 Tillage claw axis 10 Rotary cover 12 Resistor 13 Bracket

Claims (1)

On the transmission case that supports the wheel, it extends to the rear lower side in front and rear, and forms an extension part with the tip edge of the lower end in an arc shape. A walking-type work machine that supports a shaft, and in the extension portion, when providing a resistor that enters the soil and gives resistance to the vehicle running, the extension portion is provided at the lower rear portion of the extension portion. While fixing the bracket provided with a slanted portion that is slanted in front and rear and low in a posture along and a bent portion that is bent downward from the slanted portion along the arcuate tip edge of the extending portion In the state where the resistor enters the soil and gives resistance to the airframe travel, the bracket lower end portion is positioned directly behind the tillage claw axis and within the rotation trajectory of the tillage claw. A walking type working machine characterized in that a boss is integrally provided and the resistor is supported by the boss .

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