JP5289901B2 - Walking type mobile farm machine - Google Patents

Description

  The present invention relates to a walking-type mobile agricultural machine capable of selectively attaching a wheel and a crawler unit to an axle projecting left and right from a mission case of the fuselage.

2. Description of the Related Art A walking-type mobile agricultural machine capable of selectively attaching a wheel and a crawler unit to an axle projecting left and right from a mission case of the airframe is known (for example, Patent Documents 1 and 2). According to such a walking type mobile agricultural machine, since the wheel and the crawler unit can be selected according to the type of work, good running performance can be ensured in various kinds of work. In the sowing work required to be performed and the upsetting work requiring a large traction force, the workability and work accuracy can be improved by selecting the crawler unit.
JP 2006-298267 A JP 2006-321393 A

  However, the crawler units shown in Patent Documents 1 and 2 include a drive sprocket connected to an axle, an idler located on the front side of the fuselage with respect to the drive sprocket, a rolling wheel located on the rear side of the fuselage with respect to the drive sprocket, and a drive The sprocket, idler, and crawler suspended from the wheels are not only long in the front and rear direction and causing interference with the working part (for example, rotary), but also the drive sprocket. There was a problem that the outer diameter of the vehicle was limited and the vehicle speed equivalent to that when the wheels were mounted could not be obtained.

The present invention has been created in view of the above-mentioned circumstances and has been created for the purpose of solving these problems, and the invention of claim 1 is characterized in that the aircraft provided with a mission case, and a left and right projecting from the mission case. A walking-type mobile agricultural machine comprising a wheel attached to the axle and a crawler unit that can be attached to the left and right axles instead of the wheel, the crawler unit comprising: a drive sprocket coupled to the axle; and a drive sprocket an idler located in the fuselage forward of, the formed and a crawler wound suspended with respect to the drive sprocket and the idler, when the crawler maximum outer diameter is configured to be equal to the wheel outer diameter, the crawler A rotation restricting portion for restricting a rotation range of the unit, and the rotation restricting portion is provided on the crawler unit side; The knit side rotation restricting member and the airframe side rotation restricting member provided on the airframe side are configured, and the crawler unit side rotation restricting member and the airframe side rotation restricting member are shared by different models. a walk-moving agricultural machine, characterized in that that. In this way, the front and rear dimensions of the crawler unit (especially the dimensions extending backward from the axle) can be shortened to avoid interference with the working part, and the outer diameter of the drive sprocket can be made equal to the outer diameter of the wheel. Therefore, even when the crawler unit is mounted, the vehicle speed equivalent to that when the wheel is mounted can be obtained. Moreover, it is possible to avoid a structure in which the rotation regulating member directly contacts the crawler unit or the machine body as in the case where the rotation regulating member is provided on either the crawler unit or the machine body. Since the rotation restricting member does not get in the way when the wheel is mounted as in the case where it is provided only on the wheel, it is not necessary to remove the rotation restricting member. Further, the cost can be reduced as compared with the case where a dedicated rotation restricting member is prepared for each different model.
The invention according to claim 2 is characterized in that the left and right crawler units are independently rotatable up and down around the axle. In this way, it is possible to improve the followability of the crawler unit with respect to the unevenness of the field, and since it is not necessary to connect the left and right crawler units, not only the connection member is unnecessary, but the structure can be simplified. The detachability of the crawler unit can be improved.

  Next, embodiments of the present invention will be described with reference to the drawings. 1 to 5, reference numeral 1 denotes a walking-type management machine (walking-type mobile farm machine) according to an embodiment of the present invention. The walking-type management machine 1 includes a machine body 3 provided with a mission case 2, a mission The wheel 5 is attached to the axle 4 protruding left and right from the case 2, and the crawler unit 6 is attached to the left and right axles 4 in place of the wheel 5.

  The airframe 3 includes an engine frame 7, and an engine 8 is mounted on the front thereof. A mission case 2 is mounted on the rear portion of the engine frame 7. A belt transmission mechanism 9 is provided between the engine 8 and the transmission case 2 to transmit driving force from the engine 8 to the transmission in the transmission case 2.

  At both front and rear ends of the engine frame 7, work machine connection hitches 10 and 11 are provided. Arbitrary working machines can be connected to the hitches 10 and 11, and FIGS. 2 to 5 show a state in which a rotary working machine 12 for tillage is connected to the rear hitch 11.

  A stand 13 is provided at the front end of the engine frame 7 for holding the airframe 3 when traveling is stopped. The stand 13 of the present embodiment is freely rotatable and deformable between a use posture that protrudes downward and forward from the front end of the engine frame 7 and a storage posture along the engine frame 7.

  A handle 14 is attached to the upper end of the mission case 2. The handle 14 shown in FIGS. 1 to 5 extends rearward from the body 3, but the extension direction of the handle 14 can be changed. For example, it is also possible to work with the handle 14 extending forward from the body 3.

  The wheel 5 is configured by attaching a tire 5b to a wheel 5a. A large number of lugs 5c project from the outer peripheral surface of the tire 5b, and the traction force is exerted when these lugs 5c bite into the field. That is, the outer diameter R1 on the appearance of the wheel 5 is defined on the basis of the tip of the lug 5c, but the substantial outer diameter R2 of the wheel 5 is defined on the basis of the base end of the lug 5c. In the operation in which the work machine is connected to the rear part of the machine body 3, when the machine body 3 is turned, the work machine is lifted by the forward tilting operation of the machine body 3. At this time, the maximum forward tilt angle θ1 of the machine body 3 is Is determined by a tangent line between the lowermost position of the front end of the wheel 5 and the substantial outer diameter R2 of the wheel 5, and this maximum forward tilt angle is referred to as a nose-attached angle.

  As shown in FIGS. 6 to 9, the crawler unit 6 has a track frame 15 that faces in the front-rear direction, a drive sprocket 16 that is rotatably provided at the rear end portion of the track frame 15, and a front end portion of the track frame 15. A freely provided idler 17 and an endless belt-like crawler 18 suspended between the drive sprocket 16 and the idler 17 are provided.

  The track frame 15 is configured to be stretchable, and the tension of the crawler 18 is adjusted based on the length adjustment of the track frame 15. For example, the track frame 15 of the present embodiment is composed of square pipes 15a and 15b that are fitted in a nested joint shape, and is fixed to an arbitrary length by a bolt 19 that is screwed into the overlapping portion of both the square pipes 15a and 15b. .

  A shaft 15c facing in the left-right direction is integrally welded to the front end portion of the track frame 15, and an idler 17 is rotatably attached to the shaft 15c. Plates 15d and 15e extending vertically are integrally welded to the front end portion (front side square pipe 15a) and intermediate portion (rear side square pipe 15b) of the track frame 15. A pair of upper and lower tension bolts 20 are screwed into the rear plate 15e from the rear, and the tips of the bolts abut against the front plate 15d. Thereby, the stress generated when the crawler rotates can be received by the pair of upper and lower tension bolts 20.

  A pair of upper and lower crawler guides 21 is attached to the rear plate 15e. The crawler guide 21 prevents the crawler 18 from coming off by guiding the inner periphery of the crawler 18. Normally, when the crawler 18 is attached / detached, it is necessary to remove the crawler guide 21, but in this embodiment, the crawler 18 can be attached / detached without removing the crawler guide 21. Specifically, the crawler 18 can be attached and detached by loosening the bolt 19 and retracting the tension bolt 20 in the slack direction so that the clearance S between the idler 17 and the crawler guide 21 is zero. Incidentally, in this embodiment, the front end portion of the crawler guide 21 is shaped along the outer diameter of the idler 17 to ensure the backward stroke of the idler 17.

  A boss 15f facing in the left-right direction is integrally welded to the rear end portion of the track frame 15, and a sprocket shaft 16a of the drive sprocket 16 is rotatably passed therethrough. The main part of the crawler unit 6 configured as described above is configured symmetrically with respect to the center line C of the track frame 15 in side view. Specifically, as shown in FIG. 9, the drive sprocket 16, the idler 17 and the tension bolt 20 are arranged symmetrically with respect to the center line C of the track frame 15. Thereby, since the main part of the crawler unit 6 attached to the left and right axles 4 can be made common, the cost can be greatly reduced and the occurrence of erroneous assembly can be prevented. Further, since the bolt 19 and the tension bolt 20 can be easily reached, the tension of the crawler 18 can be easily adjusted.

  The sprocket shaft 16a of the drive sprocket 16 is a hollow shaft, and a foil tube 22 made of a hollow shaft is inserted into the hollow portion. Pin insertion holes 16b and 22a are formed at the outer ends of the sprocket shaft 16a and the foil tube 22, and by inserting the clevis pin 23 here, the sprocket shaft 16a and the foil tube 22 are integrally connected. . A pin insertion hole 22 b is also formed at the inner end of the foil tube 22. Then, the wheel tube 22 and the sprocket shaft 16a are inserted by fitting the inner end portion of the wheel tube 22 to the axle 4 and inserting the clevis pin 24 into the pin insertion hole 22b formed in the inner end portion of the wheel tube 22 and the axle shaft 4. And the crawler unit 6 is mounted on the axle 4. That is, the wheel 5 and the crawler unit 6 can be exchanged only by inserting and removing the clevis pin 24.

  In the present embodiment, the sprocket shaft 16a is connected to the axle 4 via the wheel tube 22 without being directly connected to the axle 4. Therefore, by simply replacing the wheel tube 22, between different models having different axle shapes. The crawler unit 6 can be shared. That is, the crawler unit 6 can be shared between different models by simply matching the inner diameter shape of the wheel tube 22 to the outer diameter shape of the axle 4.

  As described above, the crawler unit 6 includes the drive sprocket 16 connected to the axle 4, the idler 17 positioned on the front side of the machine body relative to the drive sprocket 16, and the crawler 18 suspended around the drive sprocket 16 and the idler 17. The crawler maximum outer diameter R3 is equal to the wheel outer diameter (R1 or R2).

  In this way, the front-rear dimension of the crawler unit 6 (particularly, the dimension extending rearward from the axle 4) can be shortened to avoid interference with the working portion, and the outer diameter of the drive sprocket 16 can be reduced to the outer diameter of the wheel. Therefore, even when the crawler unit is installed, the vehicle speed equivalent to that when the wheels are installed can be obtained. Further, the crawler 18 has a lower ground pressure than the wheel 5 and can exert a large traction force with a small amount of subsidence in the soil. Therefore, the crawler 18 is suitable for a sowing bed operation requiring a low ground pressure, and has an appearance. Since the upper crawler maximum outer diameter is substantially equal to the crawler maximum outer diameter, the crawler maximum outer diameter R3 is made equal to the substantial wheel outer diameter R2, and the crawler unit 6 can be made compact.

  Further, the left and right crawler units 6 are independently rotatable up and down around the axle 4. That is, since the left and right crawler units 6 are independently suspended, it is possible to improve the followability of the crawler unit 6 with respect to the unevenness of the field. Moreover, as in the reference example shown in FIGS. 14 and 15, it is not necessary to connect the left and right crawler units 6 via the connecting member 101, so that not only the connecting member is unnecessary, but the structure can be simplified. The detachability of the crawler unit 6 can be improved.

  In addition, the walking management machine 1 includes a rotation restricting unit 25 that restricts the rotation range of the crawler unit 6. The rotation restricting portion 25 includes a crawler unit side rotation restricting member 26 provided on the crawler unit 6 side and a machine body side rotation restricting member 27 provided on the body 3 side. For example, the crawler unit side rotation restricting member 26 of the present embodiment is configured by welding a U-shaped guide member 26 b to a base 26 a that is bolted to the track frame 15. A stopper member 27b is welded to a base 27a that is bolted to the engine frame 7, and when the crawler unit 6 reaches a predetermined rotation restriction angle, the guide member 26b on the crawler unit side is on the side of the machine body. Further contact with the stopper member 27b restricts further rotation of the crawler unit 6. In this way, it is possible to avoid a structure in which the rotation restricting member directly contacts the crawler unit 6 or the machine body 3, as in the case where the rotation restricting member is provided on either the crawler unit 6 or the machine body 3. As in the case where the rotation restricting member is provided only on the machine body side, the rotation restricting member does not get in the way when the wheel is mounted, so that the removal of the rotation restricting member becomes unnecessary.

  Moreover, it is preferable that the crawler unit side rotation restricting member 26 and the machine body side rotation restricting member 27 are shared by different models. Even if the crawler unit side rotation restricting member 26 and the machine body side rotation restricting member 27 are shared among different models, as shown in FIGS. The mounting hole 27c is formed so that the mounting position on the machine body side can be adjusted, thereby optimizing the rotation range of the crawler unit 6 in each model. If it does in this way, cost reduction can be aimed at compared with the case where a special rotation control member is prepared for every different model.

  Moreover, it is preferable to arrange | position the rotation control members 26 and 27 in the outer diameter of the drive sprocket 16 by side view. In this way, the interference between the rotation restricting members 26 and 27 and the stand 13 can be avoided, so that the operation of the stand 13 can be easily performed even when the crawler unit is mounted, and the rotation restricting members 26 and 27 during traveling can be facilitated. Inconvenience that the member is damaged due to interference between the stand 13 and the stand 13 can also be avoided.

  Further, the maximum rising angle θ2 of the crawler unit 6 defined by the rotation restricting members 26 and 27 is larger than the nose-attached angle θ3 of the airframe 3 as shown in FIG. That is, if the nose angle θ3 of the airframe 3 that can be placed when the crawler unit is mounted is determined by the tangent line between the lowest position of the front end portion of the airframe 3 and the maximum outer diameter R3 of the crawler 18, the crawler unit 6 rises exceeding this. Can be used to ensure the same forward tilt angle as when the wheels are installed even when the crawler unit is installed (the aircraft 3 can be tilted forward until the front end of the aircraft is buried in the soil) As a result, it is possible to improve the turnability of the airframe when the crawler unit is mounted. In addition, since the amount of lift of the working unit during turning of the machine body can be increased, it is possible to easily overrun the working unit during the uprighting work and the like, and inconveniences such as breaking the kite at the working unit can be avoided.

The rotation restriction range of the crawler unit 6 can be changed according to the situation. For example, as shown in FIG. 13A, the crawler unit side rotation restriction member 26 has a guide member 26b. If the cylindrical member 26c is attached or if the cylindrical members 27d and 27e are attached to the stopper member 27b of the airframe side rotation restricting member 27, the mutual contact positions change, so that the rotation restricting range of the crawler unit 6 is changed. be able to.

  According to the present embodiment configured as described, the airframe 3 provided with the mission case 2, the wheels 5 attached to the axle 4 projecting left and right from the mission case 2, and left and right axles instead of the wheels 5 The crawler unit 6 includes a drive sprocket 16 connected to the axle 4, an idler 17 located on the front side of the machine body relative to the drive sprocket 16, The crawler 18 is suspended from the drive sprocket 16 and the idler 17, and the crawler maximum outer diameter R3 is equal to the wheel outer diameter (R1 or R2). (Particularly, the dimension extending rearward from the axle 4) can be shortened to avoid interference with the working part, and the outer diameter of the drive sprocket 16 can be avoided. Since it equivalent to the wheel outer diameter, even when the crawler unit mounting, equivalent to vehicle speed and when the wheel mounting is obtained.

  Further, since the left and right crawler units 6 are independently rotatable up and down about the axle 4, the followability of the crawler unit 6 with respect to the unevenness of the field can be improved, and the left and right crawler units Since it is not necessary to connect 6, not only the structure can be simplified without a connecting member, but also the detachability of the crawler unit 6 can be improved.

  The crawler unit 6 has a rotation restricting portion 25 that restricts the rotation range of the crawler unit 6. The rotation restricting portion 25 includes a crawler unit side rotation restricting member 26 provided on the crawler unit 6 side, and a machine body 3 side. Since it is comprised by the body side rotation control member 27 provided, a rotation control member is provided in the crawler unit 6 or the body 3 as in the case where the rotation control member is provided in either the crawler unit 6 or the body 3. The structure that directly contacts can be avoided, and the rotation restricting member does not get in the way when the wheel is mounted as in the case where the rotation restricting member is provided only on the body 3 side. Is no longer necessary.

  Further, since the crawler unit side rotation restricting member 26 and the machine body side rotation restricting member 27 are shared by different models, the cost can be reduced compared to the case where a dedicated rotation restricting member is prepared for each different model. Can be planned.

It is a perspective view of the walk type management machine which shows a wheel mounting state. It is a side view which shows the walk type management machine of a wheel mounting state (showing a substantial outer diameter). It is a side view which shows the walk type management machine of a wheel mounting state (it shows the outer diameter on an external appearance, and a substantial outer diameter). It is a side view which shows the walk type management machine of a wheel mounting state (it shows the outer diameter on an external appearance). It is a side view which shows the walk type management machine of a crawler unit mounting state. It is a side view which shows the crawler unit of a mounting state. It is a plane sectional view showing a crawler unit. It is a side view which shows a crawler unit. It is a side view which shows the frame structure of a crawler unit. It is a side view of the walking type management machine which shows before attachment of the body side rotation control member. It is a side view of the walking type management machine which shows after attachment of the body side rotation control member. It is a side view of the walk type management machine which shows the angle with a nose of a body, and the maximum rise angle of a crawler unit. (A) is explanatory drawing of the rotation range change member with which a crawler unit side rotation control member is mounted | worn, (B) is explanatory drawing of the rotation range change member with which the body side rotation control member is mounted | worn. It is a plane sectional view showing a crawler unit concerning a reference example. It is a side view which shows the crawler unit which concerns on a reference example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Walk type management machine 2 Mission case 3 Machine body 4 Axle 5 Wheel 6 Crawler unit 15 Track frame 16 Drive sprocket 17 Idler 18 Crawler 25 Rotation restriction part 26 Crawler unit side rotation restriction member 27 Machine body side rotation restriction member

Claims (2)

An aircraft with a mission case,
Wheels attached to the axle protruding left and right from the mission case;
A walking-type mobile agricultural machine comprising a crawler unit that can be attached to left and right axles instead of wheels,
The crawler unit includes a drive sprocket connected to the axle, an idler positioned on the front side of the machine relative to the drive sprocket, and a crawler suspended around the drive sprocket and the idler, and the crawler maximum In configuring the diameter to be equal to the wheel outer diameter ,
A rotation restricting portion for restricting a rotation range of the crawler unit, and the rotation restricting portion includes a crawler unit side rotation restricting member provided on the crawler unit side and an airframe side rotation restriction provided on the airframe side. And composed of members,
The crawler unit side rotation restricting member and the machine body side rotation restricting member are commonly used by different models .   The walking type mobile agricultural machine according to claim 1, wherein the left and right crawler units are independently rotatable up and down around an axle.

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