JP2012065585A - Walking-type farming implement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a walking type farming implement having a skid projecting obliquely downward to the rear in the rear of a lateral tilling rotary disposed under a machine body, and capable of efficiently controlling the head-up motion of the machine body.SOLUTION: The walking type farming implement includes the skid 21 disposed in the rear of the lateral tilling rotary 4 under the machine body 5 and inclined obliquely downward to the rear, and a steering handle 7 projecting obliquely upward in the rear of the machine body 5. The walking type farming implement performs tilling work by rotationally driving the tilling rotary 4 to the advancement side with an end 21a on the projecting side of the skid 21 inserted into the soil. In the farming implement, ground wheels 22, which can be fixed to the machine body 5 at a working position P2 where the wheels are in contact with a field, are disposed at positions close to the skid 21 between the skid 21 and the tilling rotary 4. The vertical position of the lower end of the ground wheels 22 when the posture of the machine body 5 is turned in the horizontal direction is set lower than the end 21a on the projecting side of the skid 21.

Description

  The present invention relates to a walking type farm working machine provided with a left and right tillage rotary arranged on the lower side of a machine body.

  A left and right tillage rotary disposed on the lower side of the fuselage, a resistance rod extending obliquely downward and rearward from the fuselage side so as to be located behind the tillage rotary, and a rearward and obliquely upward projection of the fuselage A walking type shown in Patent Documents 1 and 2 for performing a tilling work by rotating a tilling rotary to a forward side with a steering handle and at least an extension side end of the resistance rod inserted into the soil Agricultural machines are known.

Japanese Patent Laid-Open No. 2001-322571 (FIG. 1) JP 2008-212077 (Fig. 1-2)

  In the above-mentioned walking type farm work machine, the resistance rod inserted in the soil becomes resistance, and the machine body does not move forward and backward, so when rotating the tillage rotary to the forward side, the machine body is stabilized. On the other hand, the resistance rod does not provide resistance when the fuselage rotates around the axis of the tilling rotary, so that the steering handle is swung downward when the tilling rotary is driven forward. Thus, the head-up operation in which the airframe rotates around the tilling rotary axis cannot be efficiently suppressed, and work efficiency may be resisted.

  The present invention comprises a left and right tillage rotary disposed on the lower side of the fuselage, and a resistance bar extending obliquely downward and rearward from the fuselage side so as to be located behind the tillage rotary, and a steering handle is provided. It is an object of the present invention to provide a walking type farm working machine capable of efficiently suppressing a head-up operation in which the machine body rotates around the axis of the tilling rotary so as to be swung downward.

  In order to solve the above problems, firstly, a left and right tillage rotary 4 disposed on the lower side of the machine body 5 and a rearward and obliquely downward extension from the machine body 5 side so as to be positioned behind the tillage rotary 4. The resistance rod 21 and the steering handle 7 projecting diagonally upward and rearward of the machine body 5 are advanced, and the tilling rotary 4 is advanced with at least the extension side end 21a of the resistance rod 21 inserted into the soil. The grounding wheel 22 which is a walking type farm working machine that performs tilling work by rotating to the side, and can be fixed to the machine body 5 at the work position P2 grounded on the farm field, the resistance rod 21 and the tilling rotary 4 So that the vertical position of the lower end of the ground ring 22 is lower than the extension side end portion 21a of the resistance rod 21 when the body 5 is oriented in the horizontal direction. It is special that the grounding ring 22 is arranged. It is set to.

  Secondly, the grounding wheel 22 is supported by the machine body 5 so as to be swingable up and down between the storage position P1 that is located above the work position P2 and is in a non-grounded state from the field and the work position P2. A support mechanism 23 is provided so that the ground ring 22 can swing up and down at least in a range R between the storage position P1 and the work position P2, and the ground ring 22 is fixed at each of the storage position P1 and the work position P2. The support mechanism 23 is configured so as to be able to be made.

  Third, the grounding wheel 22 switched to the storage position P1 is positioned in front of the imaginary line L connecting the vertical swing fulcrum 28 of the grounding wheel 22 and the rear end of the steering handle 7 in a side view. Thus, the support mechanism 23 is configured.

  According to the above configuration, when the tillage rotary is driven, the head-up operation in which the body rotates around the axis of the tillage rotary so that the steering handle is swung downward is performed by the grounding wheel arranged at an appropriate position. It can be suppressed efficiently.

  In addition, a support mechanism for supporting the grounding wheel on the machine body is provided so as to be swingable up and down between the storage position that is located above the work position and is not grounded from the field, and the work position. If the support mechanism is configured so that the grounding wheel can swing up and down in at least a part of the range between the working position and the grounding wheel can be fixed at each of the storage position and the working position, The switching operation between the storage position and the work position in the grounding wheel is facilitated, and a groove that can be sown in the field can be formed by the grounding ring.

  Further, the support mechanism is configured so that the grounding wheel switched to the storage position is positioned in front of the virtual line connecting the vertical swing fulcrum of the grounding wheel and the rear end of the steering handle in a side view. As a result, it is possible to provide a sufficient margin at the feet of the operator who performs the steering operation with the steering handle, and to make the entire center of gravity more than before.

It is a whole side view of the walk type management machine to which the walk type farm work machine of the present invention is applied. (A), (B) is the rear view and side view which show the structure of a tail wheel and a support mechanism. It is a whole side view of this management machine in the state where a tail wheel was located in a storage position.

  FIG. 1 is an overall side view of a walking-type management machine to which a walking-type farm work machine according to the present invention is applied. As shown in the figure, the management machine is a kind of mobile farm machine, and includes a machine frame 1, an engine 2 fixedly installed (fixed) on the machine frame 1, and a fuel tank fixed above the engine 2. The airframe 5 is composed of 3 etc. A horizontal rotary rotary 4 that is a tilling work machine driven by engine power is disposed below the machine body 5, via a handle frame 6 that protrudes upward from the rear end of the machine frame 1 (machine body 5). In addition to the steering handle 7 projecting obliquely upward and rearward, a shift lever 8 projecting obliquely upward and rearward from the machine body 5 is disposed below the steering handle 7.

  The airframe frame 1 is constituted by a main frame 9 in the front-rear direction, a mission case 11 that inclines downward from the rear portion of the main frame 9 and the like. A damper 12 having a reverse U-shape in plan view, which also serves as a grip for lifting the management machine, is attached and fixed to the front end portion of the main frame 9, and from the rear end portion of the main frame 9, an attachment portion for attaching various devices A hitch 13 is integrally extended toward the rear.

  A transmission case 14 is attached and fixed to the side of the engine 2 on the body frame 1, and engine power is transmitted through a transmission belt (not shown) in the transmission case 14 and a transmission mechanism (not shown) in the transmission case 11. Via the rotary rotary 4. In addition, a clutch mechanism (not shown) is provided in the transmission case 14 and includes a tension pulley that adjusts the tension of the transmission belt 14, and transmission of engine power to the transmission mechanism is intermittently performed by the clutch mechanism. Is done.

  The tillage rotary 4 is configured by a left and right rotary shaft 16 that is inserted into and supported by the lower portion of the mission case 11 and rotates about its own axis, and a plurality of tillage claws 17 that are mounted on the rotary shaft 16. ing. When the speed change of the speed change mechanism is performed by the swinging operation of the speed change lever 8, the engine power is transmitted to the rotary shaft 16 and the field is plowed by the plurality of tilling claws 17 that rotate integrally with the rotary shaft 16.

  The steering handle 7 is formed in a bifurcated shape extending in a C shape toward the rear in plan view to form a pair of left and right bifurcated portions 18, and the bifurcated portion 18 faces rearward in a side view. The rear part is bent downward with respect to the front part and the middle part that face obliquely upward. Grips (gripping portions) 18a, 18a are formed at the rear ends of the left and right paired bifurcated portions 18, 18, and the clutch lever 19 is vertically moved near one side (left side in the illustrated example) of the left and right grips 7a. It is supported so that it can be swung.

  The clutch lever 19 is mechanically coupled to the clutch mechanism via a linkage mechanism such as a wire, and the clutch mechanism is connected and operated by swinging the clutch lever 19 downward along the grip 18a. The clutch mechanism is disengaged by swinging upward of the clutch lever 22 that is spaced apart from 18a and tilts upward toward the rear.

  The clutch lever 19 is constantly elastically biased upwardly and can grip the clutch lever 19 and the grip 18a together when the clutch lever 19 swings downward. That is, the clutch lever 19 becomes a deadman clutch that drives the tilling rotary 4 by connecting and operating the clutch mechanism only at the time of the turning operation to swing downward.

  According to the configuration of the present management machine as described above, an operator walking in the field holds the grip 18a together with the clutch lever 19 and moves the tilling rotary 4 forward (the counterclockwise direction shown in FIG. 1). ), The vehicle body 5 is caused to travel forward while performing the steering operation of the vehicle body 5 by the steering handle 7, and the farming work of the farm field is performed.

  At this time, the hitch 13 has a resistance rod 21 that becomes resistance when the body 5 moves back and forth, and a tail wheel (grounding wheel) 22 that suppresses the head-up operation of the body 5 when the tillage rotary 4 is driven forward. Is provided.

  The head-up operation is such that, when the tillage rotary 4 is rotated forward, the body 5 is rotated in the direction opposite to the rotation direction of the tillage rotary 4 around the rotary shaft 16 (clockwise in FIG. 1). The reaction force from the tilling rotary 4 acts. Due to this head-up operation, a force in the downward swing direction is applied to the steering handle 7, and stable steering operation and intermittent operation of the clutch lever 19 cannot be performed. The above-described tail wheel 22 is supported via the head wheel, and the head-up operation is suppressed by the tail wheel 22.

  The resistance rod 21 is bent so that the midway portion is inclined obliquely downward and downward with respect to the upper portion facing the vertical direction, and the lower end portion 21a is further bent downward. The upper portion of the resistance bar 21 facing in the vertical direction is inserted into a mounting portion 24 that is a cylindrical member in the vertical direction formed at the rear end portion of the hitch 13, and a plurality of vertical mounting holes 21 b and mounting pins 26 are used. The upper part of the resistance part is fixedly attached to the attachment part so that the vertical position can be adjusted. In other words, the resistance rod 21 extends rearward and obliquely downward from the body 5.

  At least the lower end portion (extension side end portion) 21a of the resistance rod 21 is inserted into the soil during forward travel of the machine body 5 by the forward rotation drive of the tillage rotary 4, and restricts the machine body 5 from moving back and forth in an unsteady manner. And stabilize its posture.

Next, the configuration of the tail wheel 22 and the support mechanism 23 will be described in detail with reference to FIGS.
2A and 2B are a rear view and a side view showing the configuration of the tail wheel and the support mechanism, and FIG. 3 is an overall side view of the management machine with the tail wheel positioned at the storage position. is there. The support mechanism 23 includes a cylindrical bearing (not shown) that is inserted and fixed in the rear portion of the hitch 13, and a left and right support that is inserted into the bearing while being slidable in the axial direction and rotates about the axis. A shaft 28 and a pair of left and right support frames 29 that support the left and right tail wheels 22 so as to freely rotate are provided.

  The left and right support frames 29 have base end portions that protrude inwardly on the left and right sides attached and fixed to the left and right end portions of the support shaft 28 via attachment portions 31, respectively, The wheels 22 are pivotally supported in the front-rear idle state. The left and right support frames 29 and the single support shaft 28 are formed in a U shape as a whole, and the middle portions of the left and right support frames 29 and 29 are connected and fixed by a connection frame 32 in the left and right direction. Yes. As a result, the left and right support frames 29 (tail wheels 22) are respectively supported by the hitch 13 (airframe 5) so as to be swingable up and down around the support shaft 28 while maintaining the same posture. In other words, the support shaft 28 becomes a vertical swing fulcrum of each support frame 29 and the tail wheel 22.

  The support mechanism 23 includes a storage state in which each tail wheel 22 is fixed to the machine body 5 at the storage position P1 that is the uppermost swing position, and a work position P2 that is the lowermost swing position. The fixed work state and the free state in which the vertical swing is possible within a partial range (free swing range R) between the storage position P1 and the work position P2 on the swing locus D with the support shaft 28 as a fulcrum. A switching mechanism 33 is provided as switching means for switching to any of the states. Incidentally, the free swing range R is formed on the rear side of the storage position P1 and the work position P2.

  The switching mechanism 33 attaches and fixes a ring-shaped switching member 34 through which the support shaft 28 is slidable in the axial direction and is rotatable about the axis to the left and right side surfaces of the hitch 13. An elastic member 36 that urges the support shaft 28 in a direction in which the support frame 29 (switching side support frame 29A) approaches the switching member 34 (engagement side) is provided, and the switching member 34 is changed from the mounting portion 31 of the switching side support frame 29A. The left and right switching pins 37 are formed so as to project integrally.

  A coiled compression spring positioned between the non-switching side support frame 29B, which is the support frame 29 on the opposite side of the switching side support frame 29A, and the hitch 13 and sheathed on the support shaft 28 becomes the elastic member 36. . On the other hand, three engaging portions 34 a, 34 b, 34 c that are recessed in the radial direction are formed in the outer peripheral edge of the ring-shaped switching member 34.

  The opposing surfaces of the switching member 34 and the switching-side support frame 29A are held in contact with each other by the elastic force of the compression spring 36, and the switching pin 37 is connected to any of the engaging portions 34a, 34b and 34c are inserted from the axial direction and engaged. Of the three engaging portions 34a, 34b, 34c, two of them are fixing engaging portions 34a, 34b formed at symmetrical positions of the switching member 34, and the other one is a pair of fixing engagement members. This is a movable engaging portion 34c formed at an intermediate position between the joint portions 34a and 34b.

  When the switching pin 37 is inserted and engaged with the fixing engaging portions 34a and 34b, the periphery of the switching pin 37 is fitted into the fixing engaging portion 34, and the rotation of the support shaft 28 around the axis is restricted. Thus, each support frame 29 is fixed at a predetermined position. More specifically, one of the two fixing engagement portions 34a and 34b is a storage-side fixing engagement that fixes the tail wheel 22 at the storage position P1 when the switching pin 37 is fitted. In addition to the portion 34a, the other of the two fixing engaging portions 34a and 34b is a work side fixing member that fixes the tail wheel 22 at the above-described working position P2 when the switching pin 37 is fitted. The two fixing engaging portions 34a and 34b are arranged and configured so as to become the joint portion 34b.

  The movable engaging portion 34 c is formed in an arc shape around the support shaft 28. When the switching pin 37 is engaged with the movable engaging portion 34c, the support shaft 28 is allowed to rotate around the axis within a range in which the switching pin 37 moves the movable engaging portion 34c. In addition, the tail wheel 22 is integrated with the support frame 29 so as to freely swing up and down within the above-described free swing range R.

  In the support mechanism 23 having such a configuration, the support shaft 28 is slid to the disengagement side opposite to the engagement side against the elastic force of the compression spring 36, and the engagement portions 34a, 34b, By pulling out the switching pin 37 from 34c and releasing the engagement between them, the switching pin 37 moves from one engaging portion 34a, 34b, 34c to the other engaging portion 34a, 34b, 34. The support shaft 28 can be rotated around the axis. By switching the switching pin 37 between the engaging portions 34a, 34b, and 34c, the storage state, the working state, and the free state are switched.

  When the tail wheel 22 is fixed at the storage position P1 by the support mechanism 23 and is in the storage state, as shown in FIG. 3, the support shaft 28 (the vertical swing fulcrum of the tail wheel 22) and the steering wheel are viewed from the side. It is located in front of an imaginary line L connecting the rear ends of the direction handle 7, and is in a non-grounded state with respect to the farm field. Further, when the tail wheel 22 is located at the storage position P1, the tip of the support frame 29 is bent forward in a side view with respect to the midway part, and the tail wheel 22 is located more forward. ing. As a result, a wide space for walking is formed at the feet of the operator who performs the steering operation with the steering handle 7, and the center of gravity of the airframe 7 can be easily moved forward, and the steering handle 7 is lifted. Thus, the work of turning the machine body 5 can be easily performed.

  When the tail wheel 22 is fixed at the work position P2 by the support mechanism 23 and is in a working state, as shown in FIG. 1, the position near the resistance bar 21 between the tilling rotary 4 and the resistance bar 21 in a side view. (More specifically, in the vicinity of the front side of the resistance bar 21), the vertical position of the lower end of the tail wheel 22 when the body 5 is oriented in the horizontal direction (when the main frame 9 is oriented in the front-rear horizontal direction), Compared to the vertical position of the tip 21a of the resistance rod 21, it is located on the lower side.

  With this arrangement, the tail wheel 22 arranged at a position farther away from the rotary shaft 16 and set to a lower vertical position is grounded to the field, and the vehicle body 5 travels forward when the tillage rotary 4 is driven forward. Along with this, it is rotated in a grounded state, and the head-up operation described above is efficiently suppressed. Incidentally, if the tail wheel 22 in the working state is arranged on the rear side of the resistance rod 21 that is further away from the rotary shaft 16, there is a case where it becomes an obstacle to the walking of the worker who performs the steering operation by the operation handle 7. . In addition, when the tail wheel 22 in the working state is arranged at a position where it overlaps the resistance rod 21 in a side view, the resistance rod 21 sandwiched between the left and right tail wheels 22 obstructs traveling when the farm is inclined or the like. There is a case.

  When the tail wheel 22 is brought into a free state in which the tail wheel 22 can freely swing within the free swing range R by the support mechanism 23, the tail wheel 22 contacts the field due to its own weight, and the rotational movement associated with the forward traveling of the body 5 A seeding groove extending in the traveling direction is recessed in the field. Further, the tail wheel 22 located at the upper limit of the free swing range R is disposed so as to wrap or contact with a tangent line in the front-rear direction in contact with the upper end of the tilling rotary 4 in a side view. It is prevented that the aircraft body 5 sinks more than necessary in the field. In other words, the tail wheel 22 functions as a stopper member that prevents the sinking more than a predetermined amount.

  According to the management machine as described above, it is possible to switch between the working state, the storage state, and the free state without removing the tail wheel 22 supported so as to be swingable up and down from the machine body 5 side. High convenience. Further, although the tail wheel 22 is arranged on each of the left and right sides of the resistance bar 21 so as to sandwich the resistance bar 21, either one of the left and right tail wheels 22 may be omitted.

4 Tillage rotary 5 Airframe 7 Steering handle (steering tool)
21 Resistance rod 21a Lower end (extension side end)
22 Tail wheel (ground ring)
23 Support mechanism 28 Support shaft (vertical fulcrum)
L Virtual line P1 Storage position P2 Working position R Free swing range (range)

Claims (3)

  Left and right tillage rotary (4) disposed on the lower side of the fuselage (5), and a resistance rod extending obliquely downward and rearward from the fuselage (5) side so as to be located behind the tillage rotary (4) (21) and a steering handle (7) projecting diagonally upward from the rear of the fuselage (5), and at least the extending end (21a) of the resistance rod (21) is inserted into the soil. By rotating the tillage rotary (4) to the forward side in the state, it is a walking type farm work machine that performs tillage work and can be fixed to the machine body (5) at the work position (P2) grounded to the field. A grounding ring (22) is provided near the resistance bar (21) between the resistance bar (21) and the tillage rotary (4), and the grounding ring (22) is oriented when the body (5) is oriented horizontally. 22) The vertical position of the lower end is above the extension side end (21a) of the resistance bar (21). Walk-agricultural machine arranged 該接 Chiwa (22) so as also lowered.   The grounding wheel (22) is swingable up and down between the storage position (P1) that is located above the work position (P2) and is not grounded from the field, and the work position (P2). (5) is provided with a support mechanism (23) for supporting the grounding ring (22) so that it can swing up and down in at least a part of the range (R) between the storage position (P1) and the work position (P2). The walking type agricultural working machine according to claim 1, wherein the support mechanism (23) is configured so that the ground ring (22) can be fixed at each of the storage position (P1) and the work position (P2).   The grounding wheel (22) switched to the storage position (P1) has an imaginary line (L) connecting the vertical swing fulcrum (28) of the grounding wheel (22) and the rear end of the steering handle (7). The walking type agricultural working machine according to claim 2, wherein the support mechanism (23) is configured to be positioned forward in a side view.

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