JP6008619B2 - Crawler type traveling device assembling structure and assembling method - Google Patents

Description

  The present invention relates to an assembling structure and assembling method of a traveling apparatus for a work vehicle in which left and right traveling crawlers are installed at the rear of a traveling machine body on which an engine or the like is mounted.

  The left and right traveling crawlers are installed at the rear part of the traveling machine body in a work vehicle such as a tractor, that is, the left and right front wheels are installed at the front part of the traveling machine body, and the left and right traveling crawlers are installed at the rear part of the traveling machine body. This is described in Patent Documents 1 to 3 as prior art.

  In the prior art, the rear axle is pivotally supported on the rear axle case of the traveling machine body, and the drive wheel is attached to the rear axle, while the track frame extending in the front-rear direction is disposed in a portion below the rear axle case, A structure in which a traveling crawler is mounted on a track frame, and a substantially middle portion in the front-rear direction of the track frame is disposed on a traveling body side such as the rear axle case or the like at a position below the rear axle by an appropriate distance. A single swing fulcrum shaft is pivotally mounted, and the track frame is configured such that its front and rear portions move up and down in opposite directions. A traveling crawler is wound in a substantially triangular shape across the front driven wheel provided on the front end side of the track frame, the rear driven wheel provided on the rear end side, and the driving wheel, and the traveling crawler is rotated by the driving wheel. By doing so, the traveling machine body is configured to move forward or backward. The provision of a link mechanism between the traveling machine body and the track frame is described in Patent Document 3 as a prior art.

Japanese Patent Laid-Open No. 10-45051 JP 2004-217054 A JP 2012-51389 A

  Generally, when assembling a work vehicle as described in Patent Documents 1 to 3 and the like, it is assembled by flow work on an assembly line. First, a traveling machine body is assembled, and then members such as drive wheels and a truck frame are sequentially assembled to the traveling machine body to complete a work vehicle. However, in this assembling method, since the members are individually assembled to the traveling machine body, there is a problem that the positioning operation and the assembling operation are complicated. In particular, when a work vehicle having a link mechanism as described in Patent Document 3 is assembled, the positioning work and the assembling work are further complicated, requiring a lot of assembling steps and assembling time.

  The present invention intends to provide an assembly structure and an assembly method for a crawler type traveling device which have been improved by examining these current situations.

The present invention is an assembly structure of a crawler type traveling device configured by assembling a crawler unit on the traveling machine body side , and the traveling machine body side is provided with a link mechanism and a rear axle and the link mechanism is provided. The crawler unit is connected to a track frame, a driven wheel attached to the track frame, and an assembly jig with respect to the track frame. Drive wheel, a driven wheel and a crawler belt wound around the drive wheel, and connecting the link mechanism and the track frame, and connecting the rear axle and the drive wheel. The crawler unit is assembled to the traveling machine body side .

  In the assembly structure of the crawler type traveling device, the link mechanism includes a pair of front and rear link rods, and the track frame is provided with a pair of front and rear link shafts that are formed in a two-step tapered shape having a small diameter on the track frame side. The pair of front and rear link rods and the pair of front and rear link shafts are rotatably connected to each other, so that the track frame is connected to the rear axle case via the pair of front and rear link rods and the pair of front and rear link shafts. It is good also as what is connected so that back-and-forth swinging is possible.

  In the assembly structure of the crawler type traveling device, a pitching jig that regulates the inclined posture of the two link rods to a prescribed posture may be attached to the pair of front and rear link rods.

  In the assembly structure of the crawler type traveling device, a retaining jig is provided on at least one link rod of the pair of front and rear link rods, and corresponds to the one link rod among the pair of front and rear link shafts. The one link shaft may be fitted into the retaining jig to prevent the one link shaft from falling off the one link rod.

  The invention of the present application is a driven wheel attached to the front and rear of a track frame supported so as to be able to swing back and forth via a link mechanism on a traveling machine body, and a drive wheel attached to a rear axle located above the track frame, A method for assembling a crawler type traveling device configured by winding a crawler belt, wherein the track frame and the drive wheel are connected to an assembly jig, and the crawler belt is wound to form a unit, thereby configuring the link mechanism In this assembly method, the inclination posture of the pair of front and rear link rods is defined by a pitching jig, and the drive wheel is assembled to the rear axle and the track frame is assembled to the link mechanism from the outside in the body width direction.

  According to the present invention, the driven wheels attached to the front and rear of the track frame supported to be able to swing back and forth via the link mechanism on the traveling machine body, and the drive wheels attached to the rear axle located above the track frame. An assembly structure of a crawler type traveling device configured by winding a crawler belt, comprising an assembly jig for supporting the track frame with the driven wheel and the driving wheel, and the track frame and the driving wheel. The driving wheel is assembled to the rear axle and the track frame is assembled to the link mechanism from the outside in the body width direction with the crawler belt being wound and unitized. Therefore, the drive wheel, the track frame, and the crawler belt can be assembled to the traveling machine body as one unit, and the assembly man-hour can be reduced. Give attained the shortening of the time.

  According to the present invention, the track frame is connected to a rear axle case that pivotally supports the rear axle via the link mechanism so as to swing back and forth, and pivotally supports the track frame and the link mechanism. A pair of front and rear link shafts are provided, and each of the link shafts is formed in a two-step tapered shape having a small diameter on the track frame side. Therefore, positioning with the crawler type traveling device is facilitated, and assembly man-hours can be reduced. It is possible to shorten the attaching time.

  According to the present invention, the link mechanism includes a pair of front and rear link rods, further includes a pitching jig that defines an inclination posture of the two link rods, and both ends of the pitching jig and the lower ends of the link rods. Since the two link rods are held in a prescribed tilted posture by connecting the parts, and the track frame is assembled to the two link rods, when assembling the crawler type traveling device, The link rod can be prevented from sagging under its own weight, and the assembly workability is improved. Reduces assembly man-hours and shortens the assembly time.

  According to the present invention, a pair of front and rear link shafts that pivotally support the track frame and the link rod are inserted into the link rod, and both end portions of the pitching jig and the link shafts are connected. A retaining jig for connecting and preventing the link shaft on at least one side from falling off, holding the link shaft on the at least one side and the link rod corresponding thereto by the retaining jig; Since the track frame is assembled to the eaves, the link shaft can be prevented from falling off the link eaves when assembling the track frame. The assembly work can be stabilized. Assembling workability is improved, and the number of assembling steps can be reduced and the assembling time can be shortened.

  According to the present invention, the driven wheels attached to the front and rear of the track frame supported to be able to swing back and forth via the link mechanism on the traveling machine body, and the drive wheels attached to the rear axle located above the track frame. An assembly method of a crawler type traveling device configured by winding a crawler belt, wherein the track frame and the driving wheel are connected to an assembly jig, and the crawler belt is wound to form a unit, and the link mechanism is The inclination posture of the pair of front and rear link rods to be configured is defined by a pitching jig, and the drive wheel is assembled to the rear axle, and the track frame is assembled to the link mechanism from the outside in the body width direction. The track frame and the crawler belt can be assembled to the traveling machine body as one unit, and at the same time, the link mechanism and the track frame DOO can easily assembled. Assembling workability is improved, and the number of assembling steps can be reduced and the assembling time can be shortened.

It is a left view of the tractor which shows embodiment of this invention. It is the same top view. It is a left side enlarged view of a crawler type traveling device. It is a left view of a track frame part. It is a disassembled perspective view of the crawler type traveling device in the right rear view. It is a disassembled perspective view of the left back view of a crawler type traveling device. It is a disassembled perspective view of the right rear view of a track frame support part. It is a disassembled perspective view of the left side view of a track frame support part. It is a section explanatory view of the back view of a crawler type traveling device. It is sectional explanatory drawing of the back view of a track frame support part. It is an expanded sectional view of a track frame support part. It is decomposition | disassembly explanatory drawing of FIG. It is decomposition | disassembly explanatory drawing of the left rear view which shows the connection relation of the crawler type traveling apparatus unitized and the traveling body. It is a left view of the crawler type traveling device unitized. It is a decomposition explanatory view of the left rear view which shows the connection relation of an assembly jig, a drive wheel, and a track frame. It is right side explanatory drawing which shows the connection relation of a pitch taking-out jig | tool and a link mechanism. It is explanatory drawing of a retaining jig, (a) is a front view of the state assembled | attached to the link mechanism, (b) is the perspective view seen from diagonally downward.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings when applied to a tractor. As shown in FIGS. 1-4, the code | symbol 10 in a figure shows a tractor. The tractor 10 includes a traveling machine body 11, a pair of left and right front wheels 12 that support the front part of the traveling machine body 11, and a pair of left and right crawler type traveling devices 13 that support the rear part of the traveling machine body 11. The traveling body 11 is equipped with an engine 8 and a control seat 9.

  As shown in FIGS. 1 to 4, a transmission case 40 is mounted on the rear part of the traveling machine body 11. Left and right rear axle cases 14 are provided on both left and right sides of the mission case 40. A crawler type traveling device 13 is detachably attached to the traveling machine body 11 via a rear axle case 14. As shown in FIG. 9, one end side of the rear axle 15 is pivotally supported in the rear axle case 14, and then a reduction final gear 37 is pivotally supported on one end side of the axle 15. The other end side of the rear axle 15 is projected from the rear axle case 14, and then the drive wheel 16 is attached to the other end side of the axle 15. On the other hand, a track frame 17 extending in the front-rear direction is disposed below the rear axle case 14. A flange member 18 is detachably fastened to the rear axle case 14. A front link rod 19 disposed on the front side of the rear axle 15 and a rear link rod 20 disposed on the rear side of the rear axle 15 are provided. The track frame 17 is connected to the flange member 18 via the link rods 19 and 20 so as to be swingable back and forth. That is, the flange member 18 (also referred to as the traveling machine body 11), the pair of front and rear link rods 19 and 20, and the track frame 17 form a four-bar link structure.

  As shown in FIGS. 1 to 4, a front driven wheel 21 is attached to the front end side of the track frame 17 via a tension adjusting mechanism 22. A rear driven wheel 23 is attached to the rear end side of the track frame 17 by a support shaft 24. A driving crawler 25 made of synthetic rubber as a crawler belt is wound around the drive wheel 16, the front driven wheel 21, and the rear driven wheel 23 in a substantially triangular shape. The driving wheel 16 (rear axle 15) is rotated forward or backward at an appropriate speed and the traveling crawler 25 is driven forward or backward to drive the traveling machine body 11 forward or backward. Yes.

  A plurality of rolling wheels 26 and a crawler guide body 41 are provided. The plurality of rolling wheels 26 are rotatably provided on the track frame 17. Three rolling wheels 26 of the embodiment are arranged side by side. The crawler guide body 41 is for preventing the traveling crawler 25 from coming off in the left-right direction and holding down a plurality of metal cores embedded in the traveling crawler 25 at equal intervals, and is fastened and fixed to the track frame 17. Yes. A plurality of rolling wheels 26 and a crawler guide body 41 are disposed on an inner peripheral surface (an inner peripheral surface on the grounding side of the traveling crawler 25) between the front driven wheel 21 and the rear driven wheel 23 among the inner peripheral surfaces of the traveling crawler 25. Contact. The crawler guide body 41 is formed in a boat shape having an inverted T shape when viewed from the side. The plurality of rolling wheels 26 and the crawler guide body 41 are configured to land and support the grounding side of the traveling crawler 25.

  As shown in FIGS. 3 and 4, front and rear upper end link shafts 27 and 28 are provided on the flange member 18. Front and rear upper end link shafts 27 and 28 are extended in parallel with the rear axle 15. The upper end side boss portions of the front link rod 19 and the rear link rod 20 are rotatably supported on the front and rear upper link shafts 27 and 28. Front and rear lower end link shafts 30 and 31 are provided on the track frame 17. The lower end of the front link rod 19 is rotatably connected to the track frame 17 by a front lower end link shaft 30. The front lower end link shaft 30 is positioned in front of the front upper end link shaft 27, and the front link rod 19 is inclined and supported forward.

  As shown in FIGS. 3 and 4, the rear link rod 20 has a lower end rotatably connected to the track frame 17 by a rear lower end link shaft 31. The rear lower end link shaft 31 is positioned rearward of the rear upper end link shaft 28, and the rear link rod 20 is inclined and supported rearward. As a result, the front and rear link rods 19 and 20 are arranged in a C shape spreading downward from each other in a side view of the tractor 10 (FIGS. 3 and 4). The travel crawler 25 has a distance Df from the vertical line passing through the rear axle 15 to the front driven wheel 21 from the vertical line to the rear driven wheel 23 in a side view of the tractor 10 (FIGS. 3 and 4). It is stretched in a substantially triangular shape larger than the distance Db.

  With the above configuration, when the tractor 10 is caused to travel forward, the traveling crawler 25 receives the forward reaction force from the ground, whereby the track frame 17 moves forward with respect to the traveling machine body 11 and the traveling crawler 25 rises forward. Inclined to posture. That is, when the track frame 17 moves in the forward direction with respect to the traveling machine body 11, the front link rod 19 is rotated in a direction in which the front link rod 19 is tilted so that the inclination angle from the horizontal plane becomes small with the front upper end link shaft 27 as a fulcrum. Move. Further, the rear link rod 20 is rotated in the direction in which the rear link rod 20 rises so that the inclination angle from the horizontal plane is increased with the rear upper end link shaft 28 as a fulcrum. As a result, the traveling crawler 25 tilts forward and moves forward.

  On the other hand, when the tractor 10 is caused to travel backward, by receiving a reverse reaction force from the ground, the track frame 17 moves rearward with respect to the traveling machine body 11, and the traveling crawler 25 is inclined to the forward lowering posture. That is, when the track frame 17 moves rearward with respect to the traveling body 11, the front link rod 19 rises in a direction in which the inclination angle from the horizontal plane increases with the front upper end link shaft 27 as a fulcrum. Rotate. Further, the rear link rod 20 is rotated in the direction in which the rear link rod 20 is tilted so that the inclination angle from the horizontal plane becomes small with the rear upper end link shaft 28 as a fulcrum. As a result, the traveling crawler 25 tilts forward and moves backward.

  When the driving of the traveling crawler 25 inside the turn is interrupted to turn left or right, the traveling crawler 25 inside the turning tilts forward and downward during forward traveling, and during backward traveling. The traveling crawler 25 on the inner side of the turn is inclined upward.

  Front and rear restricting pins 34 as stoppers for restricting forward rotation of the front link rod 19 with the front upper end link shaft 27 as a fulcrum and backward rotation of the rear link rod 20 with the rear upper end link shaft 28 as a fulcrum, 34 a, 35, 35 a are provided on the flange member 18. A range in which the lower end side of the front link rod 19 (rear link rod 20) rotates forward with the front upper end link shaft 27 as a fulcrum is set by the front restriction pin 34 (front restriction pin 34a). A range in which the lower end side of the rear link rod 20 (front link rod 19) rotates backward with the rear upper end link shaft 28 as a fulcrum is set by the rear regulating pin 35 (rear regulating pin 35a). The forward and backward movement of the traveling crawler 25 relative to the traveling machine body 11 is configured to be restricted by the front and rear restricting pins 34, 34a, 35, and 35a.

  When the front body of the traveling body 11 is pitched so that the front part is lowered (forward tilting operation), the front link rod 19 is rotated in a direction to tilt so that the inclination angle from the horizontal plane becomes small with the front lower end link shaft 30 as a fulcrum. Move. On the other hand, the rear link rod 20 rotates with respect to the track frame 17 in a direction to stand up with the rear lower end link shaft 31 as a fulcrum so that the inclination angle from the horizontal plane increases. Accordingly, the traveling crawler 25 is supported in a forwardly raised posture with respect to the traveling machine body 11.

  Further, when pitching (backward tilting operation) so that the front part of the traveling machine body 11 is raised, the front link rod 19 stands in a direction to stand up so that the inclination angle from the horizontal plane increases with the front lower end link shaft 30 as a fulcrum. Rotate. On the other hand, the rear link rod 20 rotates in the direction of falling so that the inclination angle from the horizontal plane becomes smaller with the rear lower end link shaft 31 as a fulcrum. As a result, the traveling crawler 25 is supported in the forwardly lowered posture with respect to the traveling machine body 11.

  By the way, in the four-bar link structure constituted by the flange member 18, the pair of front and rear link rods 19 and 20, and the track frame 17, the "instant center" when the track frame 17, which is one node, moves in the longitudinal direction. "Is located at the intersection where the extension line of the front link rod 19 and the extension line of the rear link rod 20 intersect each other. The track frame 17 moves in the longitudinal direction around the “instantaneous center”.

  In this case, the front and rear link rods 19 and 20 are arranged in a broadened C shape so that the instantaneous center moves to the rear side of the aircraft when the traveling vehicle 11 is pitched forward and downward. When the traveling machine body 11 is pitched forwardly, it moves to the front side of the machine body, so that the instantaneous center can be held at a height that approximates the height of the rear axle 15. As a result, when the traveling machine body 11 pitches, the distance that the traveling machine body 11 moves back and forth with respect to the track frame 17 can be significantly reduced compared to the longitudinal movement distance of the prior art.

  Further, as shown in FIGS. 1 and 2, a rotary tiller working machine 1 having a rotary tiller 2 is provided. The lower link 3 and the top link 4 (three-point link mechanism) protrude from the rear part of the traveling machine body 11 to the rear side, and the rotary tiller 1 is mounted on the lower link 3 and the top link 4. A hydraulic lift mechanism 5 is provided at the rear part of the traveling machine body 11 (upper part of the transmission case 40). A front and rear intermediate portion of the lower link 3 is connected to a lift arm 6 of the hydraulic lift mechanism 5 via a lift rod 7. While the rotary tiller 1 is moved up and down by operation of the hydraulic lift mechanism 5, the rotary tillage claws 2 are used to cultivate the soil in the field. Needless to say, various working machines can be attached to the tractor 10 instead of the rotary tilling work machine 1.

  Next, with reference to FIGS. 5 to 10, the mounting structure of the track frame 17, the link rods 19 and 20, and the flange member 18 will be described. As shown in FIGS. 8 to 10, the flange member 18 is made of a steel plate and a flat plate-shaped first bracket body 51, a steel plate and a flat plate-shaped second bracket body 52, and a steel plate and a flat plate-shaped first and second plates. 3 bracket bodies 53, 54 and flat rail-shaped bracket bodies 55, 56, 57 in the front and rear sides made of a steel plate. The first bracket body 51 and the second bracket body 52 are formed in the same shape. The front and rear horizontal rail bracket bodies 55 and 56 are fixed to the front and rear third bracket bodies 53 and 54 by welding.

  Then, bolts 61 are fastened to the first bracket body 51 and the second bracket body 52 in a cantilever manner at one end side of the two front and rear restriction pins 34 and 35 on the large diameter side. The other end sides of the restricting pins 34 and 35 are projected from the opposing surfaces of the first bracket body 51 and the second bracket body 52. Furthermore, the bolts 62 are fastened to the first bracket body 51 and the second bracket body 52 in the form of both ends at both end surfaces of the front and rear horizontal cross-bar bracket bodies 55, 56, 57. Also, the nuts 63 are fastened to the first bracket body 51 and the second bracket body 52 in the form of both ends with the screw portions at both ends of the two front and rear restricting pins 34a and 35a on the small diameter side.

  Further, the front and rear upper end link shafts 27 and 28 are passed through the upper end side bosses of the front and rear link rods 19 and 20, and the both ends of the front and rear upper end link shafts 27 and 28 are connected to the first bracket body 51 and the first bracket. Two bolts 65 are fastened to the bracket body 52 via the shaft pressing plate body 64 in a double-sided manner. The shaft retainer plate 64 is fastened with a nut 63 to prevent the shaft retainer plate 64 from rotating about its axis.

  Meanwhile, the seat plate body 66 is fixed to the first bracket body 51 by welding. The first bracket body 51 and the seat plate body 66 are fastened to the rear axle case 14 with bolts 67 and 68, respectively. Further, the front and rear third bracket bodies 53 and 54 are fastened to the rear axle case 14 with bolts 69 and 70, respectively. The rear axle case 14 is detachably fixed between the first bracket body 51 and the third bracket bodies 53 and 54 in a sandwiched manner. In the assembly operation, the second bracket body 52 is fixed to the first bracket body 51, and the unit is configured in such a manner that the front and rear link rods 19 and 20 are provided on the flange member 18. After that, the flange member 18 of the unit structure is brought into contact with the bottom surface side of the rear axle case 14 from the lower side of the rear axle case 14, and the first bracket body 51, the seat plate body 66, and the third bracket bodies 53 and 54. Are fastened with bolts 67, 68, 69, 70, and the front and rear link rods 19, 20 are assembled to the rear axle case 14 via the flange member 18.

  Further, the steady bracket body 44 is fixed to the seat plate body 66 by welding. The left and right turnbuckle check chain body 45 as a stabilizer is used so that the rotary tiller 1 (the left and right lower links 3) does not swing more than right and left more than necessary while allowing a slight swing in the left and right directions. Is provided. One end side of the check chain body 45 is connected to the middle of the front and rear width of the lower link 3, and the other end side of the check chain body 45 is detachably connected to the steady bracket body 44.

  Next, the connection structure of the track frame 17 and the link rods 19 and 20 will be described with reference to FIGS. 4 and 9 to 12. As shown in FIGS. 11 and 12, the machine body inner shaft portion 76 on one end side of the lower end link shafts 30, 31 is rotated on the lower end side boss portion of the link rods 19, 20 via slide bearing metals 71, 72. It is pivotally supported. A large-diameter shaft portion 73 and a tapered taper are formed on the other end side (outside the fuselage) of the lower end link shafts 30 and 31 that project from the lower boss side of the link rods 19 and 20 toward the outer side of the fuselage. A portion 74 and a small diameter shaft portion 75 are provided. A small-diameter shaft portion 75 is connected to the large-diameter shaft portion 73 via a taper portion 74. Bolt holes 83 are formed in the end surfaces on the other end side of the lower end link shafts 30 and 31. In addition, the outer diameter of the body inner shaft portion 76 is formed larger than the outer diameter of the large diameter shaft portion 73.

  As shown in FIGS. 11 and 12, a bearing cylinder 77 is welded and fixed to the upper surface of a square columnar track frame 17 that is long in the front-rear direction. A large diameter hole 78 for inserting the large diameter shaft portion 73 of the lower end link shafts 30, 31, a small diameter hole 79 for inserting the small diameter shaft portion 75 of the lower end link shafts 30, 31, and a large diameter hole in the small diameter hole 79. A shaft hole 81 of the bearing cylinder 77 is formed by a taper hole 80 communicating with 78. A thrust washer 82 is fitted on the other end side (outside the machine body) of the lower end link shafts 30 and 31, and a bearing cylinder 77 is fitted.

  With the above configuration, the other end side of the lower end link shafts 30 and 31 protruding from the lower end side bosses of the link rods 19 and 20 starting from the small diameter shaft portion 75 into the shaft hole 81 from the large diameter hole 78 side. Insert it. The shaft retainer plate 64 is brought into contact with the end surface of the bearing cylinder 77 on the small diameter hole 79 side, the tip of the bolt 65 is inserted into the small diameter hole 79, and the bolt 65 is screwed into the bolt hole 83 on the end surfaces of the lower end link shafts 30 and 31. The small-diameter shaft portion 75 is press-fitted into the small-diameter hole 79, the large-diameter shaft portion 73 is press-fitted into the large-diameter hole 78, and the other ends of the lower end link shafts 30, 31 are inserted into the bearing cylinder 77 on the upper surface of the track frame 17. Secure the sides.

  As shown in FIGS. 1, 4, and 9 to 12, a traveling machine body 11 on which the engine 8 is mounted, left and right front wheels 12 provided below the front part of the traveling machine body 11, and a rear lower part of the traveling machine body 11. A track frame 17 provided and left and right traveling crawlers 25 attached to the track frame 17, a rear axle 15 that transmits a rotational force to the traveling crawler 25, and a swing that supports the track frame 17 on the traveling body 11 so as to be swingable. In a work vehicle in which front and rear upper end link shafts 27 and 28 as moving fulcrum shafts are provided apart from each other, front and rear upper end link shafts 27 and 28 are provided directly below rear axle case 14 as an axle case on which rear axle 15 is pivotally supported. 28, and the rear axle case 14 is attached to the rear axle case 14 via the front link rod 19 and the rear link rod 20 provided on the front and rear upper end link shafts 27, 28. It is connected to. Therefore, for example, when traveling forward or backward, and over a convex portion such as a farm shore, even if the traveling crawler 25 tilts forward or downward with the front and rear upper link shafts 27 and 28 as the center, The inclination angle in the front-rear direction of the ground contact surface of the traveling crawler 25 is smaller than that in the prior art. That is, the ground height of the traveling machine body 11 is less likely to change than before, and the ride comfort of the operator who has boarded the control seat 9 can be maintained in a good state.

  As shown in FIGS. 4 and 9 to 12, the front and rear upper end link shafts 27 and 28 and the front and rear lower link links 30 and 31 form a swing fulcrum shaft, and the front and rear upper end link shafts are formed on the rear axle case 14. 27 and 28, front and rear lower end link shafts 30 and 31 are provided on the track frame 17, and upper and lower end portions of the front and rear link rods 20 and 21 are connected to the link shafts 27, 28, 30, and 31, respectively. . Therefore, even if the support load to the traveling machine body 11 of the track frame 17 is large, the support loads of the front and rear upper link shafts 27 and 28 and the front and rear lower link shafts 30 and 31 can be reduced, and the size of the work vehicle can be increased. Can be easily achieved. Further, it is possible to reduce the occurrence of malfunction due to deformation of the link shafts 27, 28, 30, 31 and the like, and it is possible to improve load resistance or durability.

  As shown in FIGS. 9 to 12, a first bracket body 51 as an inboard fulcrum body and a second bracket body 52 as an outboard fulcrum body are provided on the inboard side surface and the outboard side surface of the rear axle case 14. Components of the lower link 3 as a link mechanism for supporting the tilling work machine 1 on the traveling machine body 11 by sandwiching the front and rear upper end link shafts 27 and 28 between the 1 bracket body 51 and the second bracket body 52, respectively. Front and rear upper end link shafts 27 and 28 or front and rear link rods 19 and 20 are respectively arranged on the outer side of the check chain body 45). Accordingly, the support rigidity of the upper end link shafts 27 and 28 can be easily improved while the lower link 3 can be moved up and down without being limited by the rear upper end link shafts 27 and 28 or the rear link rods 19 and 20. . Moreover, the support structure of the upper end link shafts 27 and 28 can be simplified, and the manufacturing cost can be reduced.

  As shown in FIG. 10, front and rear lower end link shafts 30 and 31 are provided on the track frame 17 within the lateral width of the traveling crawler 25, and the lower end sides of the front and rear link rods 19 and 20 are offset to the track frame 17 side, respectively. It is configured. Accordingly, the lower end link shafts 30 and 31 or the link rods 19 and 20 can be installed without substantially projecting the lower end link shafts 30 and 31 or the link rods 19 and 20 from the lateral width of the traveling crawler 25. Therefore, for example, the front and rear lower end link shafts 30 and 31 or the front and rear link rods 19 and 20 can be supported while being separated from the ridges or tall crops in the tractor 10 crossing ridge operation. Enough space.

  As shown in FIGS. 1, 4, and 11, a traveling machine body 11 on which the engine 8 is mounted, left and right front wheels 12 provided on the lower front side of the traveling machine body 11, and a track frame provided on the lower rear side of the traveling machine body 11. 17, left and right traveling crawlers 25 attached to the track frame 17, a rear axle 15 that transmits rotational force to the traveling crawler 25, and a plurality of rolling wheels 26 provided on the track frame 17. In the work vehicle that supports the grounding side of the travel crawler 25 via the front upper link shaft 27 and the rear upper link shaft 28 as the two upper link shafts provided immediately below the rear axle 15, and the track frame 17 2. Two link rods 19 and 20 are connected between the front lower link shaft 30 and the rear lower link shaft 31 as the lower link shaft. The two upper front upper link shafts 27 and the rear upper link shafts 28 are divided and arranged in front and rear of the rear axle 15, and 2 on the upper surface side between the plurality of rolling wheels 26 on the upper surface side of the track frame 17. One of the front lower link shaft 30 and the rear lower link shaft 31 below the book is arranged. Therefore, the support height of the front lower end link shaft 30 provided between the plurality of rolling wheels 26 can be lowered. While the bearing structures of the upper and lower front upper link shafts 27 and the front lower link shaft 30 can be reduced in cost or weight, the bearing structure of the front lower link shaft 30 is strong against the ground reaction force of the traveling crawler 25. Can be advantageously constructed. Further, the boss body length of the link rod 19 can be easily secured, and the link lower boss body 142 of the front link rod 19 can be pivotally supported on the front lower end link shaft 30 by using a versatile bush.

  As shown in FIGS. 4 and 11, the track frame 17 supports the rear grounding side of the traveling crawler 25 via the rear driven wheel 23, and includes a rolling wheel 26 and a rear driven wheel adjacent to the rear driven wheel 23. 23, the other of the two front lower link shafts 30 and the rear lower link shaft 31 is disposed on the upper surface side of the track frame 17. Therefore, the support height of the rear lower end link shaft 31 provided between the rolling wheel 26 adjacent to the rear driven wheel 23 and the rear driven wheel 23 can be reduced. The bearing structure of the rear lower end link shaft 31 can be advantageously configured with respect to the ground reaction force of the traveling crawler 25. Further, the boss body length of the link rods 19 and 20 can be easily secured, and the link lower boss body 142 of the rear link rod 20 can be pivotally supported on the rear lower end link shaft 31 by using a versatile bush.

  As shown in FIG. 4, the two link rods 19 and 20 are arranged in a C shape in a side view of the body, and the two link rods 19 are separated from the distance between the upper ends of the two link rods 19 and 20. The distance between the lower end sides of 19 and 20 is increased. Therefore, compared with the conventional single fulcrum structure, the allowance of the two link rods 19 and 20 projected from the traveling crawler 25 toward the traveling machine body 11 can be reduced, and the two link rods 19 can be reduced. , 20 can easily reduce the occurrence of problems such as the mud adhering to the two link rods 19, 20 interfering with surrounding components.

  As shown in FIGS. 4 and 11, a front upper end link shaft 27 and a rear upper end link shaft 28 are disposed in the vicinity of the driving resultant force line X on the forward side of the traveling crawler 25, and the link shaft 27 on the front side of the machine body is driven as described above. It is arranged below the resultant force line X so that the center Y of the swing locus of the track frame 17 is below the driving resultant line X. Accordingly, the link rods 19 and 20 can be supported so as not to be easily displaced with respect to the driving force on the forward side of the traveling crawler 25, and the traveling crawler 25 can follow the road surface against the rolling reaction force. When starting or stopping, the traveling machine body 11 can be prevented from tilting back and forth, and the traveling machine body 11 can be moved in a stable posture.

  As shown in FIGS. 11 and 12, the front lower end link shaft 30 and the rear lower end link shaft 31 are formed in a two-step tapered shape having a small diameter on the track frame side, and a bearing cylinder 77 as a lower bearing body provided on the track frame 17. Then, the two lower-stage shaft portions (the large-diameter shaft portion 73 of the lower-end link shaft and the small-diameter shaft portion 75 of the lower-end link shaft) of the front lower link shaft 30 and the rear lower link shaft 31 are press-fitted by fastening the bolt 65. It is configured as follows. Accordingly, since the track frame side of the front lower end link shaft 30 and the rear lower end link shaft 31 is tapered and formed in a two-step taper shape, the front lower end link shaft 30 and the rear lower link shaft 30 are guided by the guide action of the tapered portion. Assembling workability of the lower end link shaft 31 can be improved. It is possible to reduce the assembly man-hours and the assembly time. For example, it is not necessary to incorporate the front lower end link shaft 30 and the rear lower end link shaft 31 by driving or pressing. In addition, two step portions of the front lower end link shaft 30 and the rear lower end link shaft 31 are respectively crimped to the boss body holes of the link rods 19 and 20, respectively, so that the axial strength of the front lower end link shaft 30 and the rear lower end link shaft 31 is increased. Can be maintained.

  As apparent from the above description and FIGS. 3 to 12, the vehicle includes a traveling machine body 11 on which the engine 8 is mounted, and a track frame 17 that is provided below the traveling machine body 11 and supports the traveling crawler 25 by winding. A work vehicle in which the track frame 17 is attached to the traveling machine body 11 via a link mechanism so as to be swingable back and forth, and the link mechanism is constituted by a pair of front and rear link rods 19 and 20; The airframe 11, the pair of front and rear link rods 19, 20 and the track frame 17 have a four-bar link structure. It is possible to support the traveling machine body 11 apart from the crop, and to secure a sufficient space for a ridge or a tall crop. . In addition, the structure that can secure a sufficient space for the culm or tall crops, etc., prevents the traveling crawler 25 from changing greatly in the forward / backward inclined posture by the parallel link approximation operation of the four-bar link structure. it can. In addition, it is possible to prevent a significant variation in the ground resistance of the traveling crawler 25, and to reduce the risk of field disturbance and meandering.

  Next, the structure of the drive wheel 16 will be described with reference to FIGS. As shown in FIGS. 9 and 10, a bolt 87 is fastened to the inner hole edge side of the donut-shaped sheet metal rim body 86 on the disc-like mounting portion 15 a at the end of the rear axle 15 that protrudes outward from the rear axle case 14. To do. Bolts 88 fasten the inner hole edge side of the donut-shaped drive wheel 16 to the outer peripheral edge side of the rim body 86. The drive wheel 16 has a ring-shaped sprocket tooth bottom 89 and a pair of bifurcated sprocket teeth 90 serving as locking tooth bodies protruding in the radial direction from both sides of the sprocket tooth bottom 89. The sprocket tooth bottom 89 corresponds to the ring-shaped portion of the drive wheel 16. A plurality of sets of sprocket tooth bodies 90 are provided at equal intervals throughout the sprocket tooth bottom 89. That is, the sprocket tooth bottom 89 is formed in an endless shape on the entire outer peripheral surface of the drive wheel 16, while a pair of bifurcated sprocket teeth 90 project radially outward from both side edges of the sprocket tooth bottom 89. A plurality of sets of sprocket tooth bodies 90 are arranged at equal intervals on the entire outer peripheral surface.

  Next, an assembly structure of the crawler type traveling device 13 and an assembly structure of the crawler type traveling device 13 to the traveling machine body 11 will be described with reference to FIGS. As shown in FIGS. 13 to 15, the crawler type traveling device 13 includes a track frame 17 on which driven wheels 21 and 23 are attached to the front and rear. Furthermore, a plurality of rolling wheels 26 are attached to the track frame 17 so as to be sandwiched between the front driven wheel 21 and the rear driven wheel 23. Three rolling wheels 26 of the embodiment are provided side by side below the track frame 17. And when assembling the crawler type traveling device 13, an assembly jig 101 for supporting the drive wheels 16 and the track frame 17 from the outside in the body width direction is provided.

  As shown in FIG. 15, the assembly jig 101 includes a substantially I-shaped assembly frame 102. The assembly jig 101 includes a pair of substantially cylindrical shaft members 103 that pivotally support the lower portion of the assembly frame 102 and the track frame 17. The pair of shaft members 103 are coupled to the rolling wheel shaft body 141 of any two of the plurality of rolling wheels 26 from the outer side in the body width direction. The shaft member 103 and the rolling wheel shaft body 141 are connected coaxially. In the embodiment, the shaft member 103 is attached to the rolling wheel shaft body 141 of the middle and rear rolling wheels 26 among the three rolling wheels 26. A screw hole is formed in the end surface of the shaft member 103 in the body width direction. A screw hole in the machine body width direction of the shaft member 103 is screwed into the outer side in the machine body width direction of the rolling wheel shaft body 141. The pair of shaft members 103 and the track frame 17 are connected.

  At the lower part of the assembly frame 102, a pair of assembly frame lower boss bodies 110 for fitting each shaft member 103 from the inner side in the machine body width direction are provided. Each assembly frame lower boss body 110 is formed in the lower part of the assembly frame 102 so as to be aligned in the longitudinal direction of the machine body. In addition, the assembly frame lower boss bodies 110 are arranged at intervals equal to the intervals in the longitudinal direction of the pair of shaft members 103 connected to the track frame 17. The assembly frame 102 is assembled to the track frame 17 from the outside in the body width direction. At the same time, the outer sides in the body width direction of the pair of shaft members 103 are fitted into the pair of assembly frame lower boss bodies 110 from the inner side in the body width direction. The shaft member 103 penetrates the assembly frame lower boss body 110 from the inner side in the body width direction, and projects outward in the body width direction. That is, the assembly frame 102 is pivotally supported at the intermediate portion of the shaft member 103 in the body width direction. The portion of the shaft member 103 protruding outward in the machine body width direction is pinned or fastened with a nut to the assembly frame 102. Thereby, the lower part of the assembly jig 101 and the track frame 17 are connected.

  On the other hand, a substantially U-shaped holding plate 109 that is brought into contact with the rim body 86 is provided on the upper portion of the assembly frame 102. Furthermore, the assembly jig 101 includes a plurality of pin members 104 that hold the upper part of the assembly frame 102 and the rim body 86 from the inner side in the body width direction. The pin member 104 is formed with a holding pin 105 that holds the rim body 86. An assembly frame long hole 106 for penetrating the holding pin 105 and an assembly frame through hole 107 for fastening the pin member 104 to the bolt 108 are formed at both ends and an intermediate portion of the substantially U-shaped holding plate body 109. , Each is formed. The assembly frame long hole 106 and the assembly frame through hole 107 are formed so as to be paired at both ends and an intermediate portion of a substantially U shape. With respect to the assembly frame long hole 106 and the assembly frame through hole 107 at the intermediate portion, the assembly frame long hole 106 and the assembly frame through hole 107 at each end are arranged with a phase of 90 degrees in the circumferential direction. Yes.

  The rim body 86 is formed with a plurality of rim body through holes 112 for fastening the pin member 104 and the holding plate body 109 to the bolt 108. The plurality of rim body through holes 112 are arranged at equal intervals in the circumferential direction of the rim body 86. In the embodiment, four rim body through holes 112 are formed in the rim body 86. Further, a plurality of long rim body holes 111 are formed in the circumferential direction of the rim body 86. The plurality of rim body long holes 111 are arranged in the rim body 86 so as to be equally spaced at positions between the plurality of rim body through holes 112. In the embodiment, two rim body long holes 111 are arranged between each rim body through hole 112.

  As shown in FIG. 15, a pair of protrusions 113 that protrude inward in the body width direction and support the rim body 86 are provided on the upper portion of the holding plate body 109. The protrusion 113 is inserted into the rim body long hole 111 from the outside in the body width direction. At this time, the plurality of assembly frame through holes 107 and the plurality of rim body through holes 112 are assembled so as to match. That is, the assembly frame through-hole 107 and the corresponding rim body through-hole 112 are matched. The assembly frame long hole 106 and the corresponding rim body long hole 111 are positioned so as to be penetrated by the holding pin 105. The protrusion 113 and the corresponding rim body long hole are fitted. The rim body 86 is supported by the upper part of the assembly jig 101.

  The plurality of pin members 104 are assembled from the inner side in the body width direction so as to sandwich the rim body 86 supported by the holding plate body 109. In the embodiment, the assembly jig 101 includes three pin members 104. The holding pin 105 passes through the rim body long hole 111 from the inner side in the body width direction, further passes through the assembly frame long hole 106, and projects outward in the body width direction. The portion of the holding pin 105 protruding outward in the body width direction is pinned or fastened with a nut. The holding plate 109 and the pin member 104 are fastened with bolts 108. Thereby, the rim body 86 supported by the holding plate body 109 can be held by the plurality of pin members 104. That is, the upper part of the assembly jig 101 and the drive wheel 16 are connected via the rim body 86.

  That is, the assembly jig 101 and the track frame 17 are connected, and the assembly jig 101 and the drive wheel 16 are connected. The track frame 17 and the drive wheel 16 are held at an appropriate assembly position via the assembly jig 101. Further, the traveling crawler 25 is wound around the track frame 17 with the driven wheels 21 and 23 and the driving wheel 16. In other words, the track frame 17, the drive wheel 16, and the traveling crawler 25 can be unitized into one unit by the assembling jig 101 and assembled as a crawler unit. The unitization eliminates the need to position and assemble each part individually. The drive wheel 16 of the crawler unit can be easily assembled to the rear axle 15 from the outside in the body width direction. Reduces assembly man-hours and shortens the assembly time.

  Further, as shown in FIG. 16, the track frame 17 of the crawler unit is assembled to both link rods 19 and 20. The track frame 17 is assembled to both link rods 19 and 20 via lower end link shafts 30 and 31. And the pitch taking jig | tool 121 which prescribes | regulates the inclination attitude | position of both link rods 19 and 20 is provided. The pitching jig 121 is formed in a substantially long plate shape, and is assembled to the lower ends of both link rods from the inner side in the body width direction. First, the lower end link shafts 30 and 31 are fitted into the link lower boss bodies 142 provided at the lower end portions of the both link rods 19 and 20 from the inner side in the body width direction. At this time, a shaft retainer plate 64 is fastened to a bolt 65 at the inner end in the machine width direction of the lower end link shafts 30 and 31. Both ends of the pitching jig 121 are connected to each shaft pressing plate 64 by bolt fastening or positioning pins from the inner side in the machine body width direction. Thereby, when the track frame 17 and the link rods 19 and 20 are assembled, it is possible to prevent the link rods 19 and 20 from hanging down due to their own weight. The link rods 19 and 20 are held in a prescribed inclined posture. That is, the pitch in the longitudinal direction of the body with the lower end link shafts 30 and 31 is equal to the pitch in the longitudinal direction of the pair of bearing cylinders 77. The link rods 19 and 20 can be easily assembled to the track frame 17. At the same time, since the assembly angle of the lower end link shafts 30 and 31 can also be defined, positioning can be easily performed when the lower end link shafts 30 and 31 are press-fitted into the pair of bearing cylinders 77 from the inner side in the body width direction. As a result, the assembling workability between the track frame 17 and the link rods 19 and 20 is improved, and the assembling man-hours and the assembling time can be shortened.

  As shown in FIGS. 16 and 17, at least one of the link rods 19 and 20 held in a prescribed inclined posture by the pitching jig 121 is provided with a stopper for preventing the lower end link shafts 30 and 31 from falling off. A tool 131 is provided. The retaining jig 131 includes a substantially semicircular arc-shaped link shaft pressing portion 132 that covers and holds the shaft pressing plate 64 on the inner side in the body width direction from above. Further, the retaining jig 131 includes a substantially L-shaped link rod presser 133 that holds the lower ends of the link rods 19 and 20 corresponding to the lower link shafts 30 and 31 from above. A retaining arm 134 for connecting and fixing the link shaft pressing part 132 and the link bar pressing part 133 by welding is provided.

  As shown in FIG. 17, the lower end link shafts 30 and 31 are assembled in a state of being retracted inward in the body width direction by a retracting length L1 that is press-fitted into the pair of bearing cylinders 77. In the link shaft pressing portion 132, a groove portion 135 that engages with the shaft pressing plate body 64 and a retracting length defining portion 136 that defines the retracting length L1 are formed. The length of the retractable length defining portion 136 in the body width direction is formed to be equal to the retracted length L1. The link shaft presser 132 is fitted on the shaft presser plate 64 on the inner side in the machine body width direction from above. The groove 135 and the shaft pressing plate 64 are engaged. At the same time, the link bar holder 133 is fitted onto the link bars 19 and 20 from above. As a result, while holding the positions of the lower end link shafts 30 and 31 and the link rods 19 and 20 in the body width direction, the shaft pressing plate body 64 held by the groove 135 and the link lower boss body 142 inside the body width direction. The distance from the end face can be separated by the pull-in length L1. That is, when the track frame 17 and the two link rods 19 and 20 are assembled, it is possible to prevent the lower end link shafts 30 and 31 from falling off the link rods 19 and 20. Further, since the pair of front and rear lower end link shafts 30 and 31 are connected via a pitching jig 121, if at least one of the lower end link shafts 30 and 31 is provided with a retaining jig 131, both It is possible to prevent the lower end link shafts 30 and 31 from falling off. At the same time, the lower end link shafts 30, 31 can be set to an appropriate retracting length L1. The assembly work can be stabilized, the assembly workability can be improved, the number of assembling steps can be reduced, and the assembling time can be shortened.

  The reason why the shaft pressing plate body 64 and the end surface of the link lower boss body 142 on the inner side in the body width direction are separated by the drawing length L1 is to facilitate the press-fitting operation. That is, after the track frame 17 and the link rods 19 and 20 are brought into contact with each other, the retaining jig 131 is removed from the link rods 19 and 20. Subsequently, the lower end link shafts 30 and 31 are press-fitted into the pair of bearing cylinders 77. The lower end link shafts 30 and 31 are press-fitted into the pair of bearing cylinders 77 toward the outer side in the body width direction by the retracted length L1. The track frame 17 is assembled to both link rods 19 and 20 via lower end link shafts 30 and 31.

  Next, a method for assembling the crawler unit will be described with reference to FIGS. First, driven wheels 21 and 23 are attached to the front and rear of the track frame 17. Furthermore, a plurality of rolling wheels 26 are attached to the track frame 17. The shaft member 103 is connected to the rolling wheel shaft body 141 from the outside in the body width direction. The assembly frame lower boss body 110 is fitted into the shaft member 103 from the outside in the body width direction, and the assembly frame 102 and the track frame 17 are connected. And the protrusion part 113 is inserted in the rim body long hole 111 from the body width direction outer side. The plurality of pin members 104 are fastened with bolts 108 from the inner side in the body width direction with the rim body 86 sandwiched between the holding plate body 109. Then, the traveling crawler 25 is wound around the driven wheels 21 and 23 and the driving wheel 16. Through these operations, the track frame 17, the drive wheel 16, and the traveling crawler 25 can be unitized through the assembly jig 101 and configured as a crawler unit.

  On the other hand, the lower end link shafts 30 and 31 are fitted into the link lower boss body 142 on the traveling machine body side. A shaft retainer plate 64 is bolted to the inner ends of the lower end link shafts 30 and 31 in the body width direction. Both ends of the pitching jig 121 are bolted to the shaft pressing plate 64 from the inner side in the body width direction. As a result, both link rods 19 and 20 are held in a prescribed inclined posture based on the length of the pitching jig 121. That is, the pitch in the longitudinal direction of the body with the lower end link shafts 30 and 31 is equal to the pitch in the longitudinal direction of the pair of bearing cylinders 77. The lower end link shafts 30 and 31 can be smoothly fitted into the pair of bearing cylinders 77. At the same time, the mounting angle of each lower end link shaft 30, 31 can be defined. Therefore, when the lower end link shafts 30 and 31 are press-fitted into the pair of bearing cylinders 77 from the inner side in the body width direction, positioning can be easily performed.

  Then, the crawler unit is assembled to the traveling machine body 11 from the outside in the machine body width direction. That is, the link rods 19 and 20 and the track frame 17 are connected, and the rear axle 15 and the drive wheel 16 are connected. As a result, the track frame 17, the drive wheel 16, and the traveling crawler 25 can be easily assembled to the traveling machine body 11. Assembling workability is improved, and the number of assembling steps can be reduced and the assembling time can be shortened.

  In the embodiment, the traveling machine body 11, the pair of link rods 19 and 20, and the track frame 17 form a four-bar link structure. That is, the longitudinal swing fulcrum of the track frame 17 is different from the axis of the rear axle 15. Therefore, when assembling the crawler unit to the traveling machine body 11, the assembling jig 101 is configured so that the crawler unit is held at a stable angle by its own weight balance. The crawler unit is assembled in a posture in which the track frame 17 is inclined obliquely forward and downward by the assembly jig 101. Thereby, alignment with the crawler unit, the rear axle 15, and both link rods 19 and 20 can be easily performed in a stable state. Further, the assembly workability is improved, and the number of assembly steps can be reduced and the assembly time can be shortened.

  As apparent from the above description and FIGS. 13 to 17, the driven wheels 21 and 23 attached to the front and rear of the track frame 17 supported by the traveling machine body 11 through the link mechanism so as to be able to swing back and forth, and the track The crawler type traveling device 13 is constructed by winding a crawler belt 25 around a driving wheel 16 mounted on a rear axle 15 located above the frame 17, and is a track with the driven wheels 21 and 23. An assembly jig 101 for supporting the frame 17 and the drive wheel 16 is provided, the track frame 17 and the drive wheel 16 are connected to the assembly jig 101, and the crawler belt 25 is wound to form a unit. The drive wheel 16 is assembled to the rear axle 15 and the track frame 17 is assembled to the link mechanism from the outside in the body width direction. The drive wheel 16 and the track frame 17 and the crawler belt 25 can be assembled to the vehicle body 11 as a unit, thereby shortening the time assembling the reduction sequence of assembling steps.

  As shown in FIGS. 11 and 12, the track frame 17 is connected to a rear axle case that pivotally supports the rear axle 15 via the link mechanism so as to be able to swing back and forth, and the track frame 17 and the link mechanism are connected to each other. A pair of front and rear link shafts 30, 31 that pivotally support the shaft is provided, and each of the link shafts 30, 31 is formed in a two-step tapered shape having a small diameter on the track frame side. Positioning can be facilitated, and the number of assembling steps can be reduced and the assembling time can be shortened.

  As shown in FIGS. 13 to 17, the link mechanism includes a pair of front and rear link rods 19 and 20, and further includes a pitching jig 121 that defines the inclined posture of the link rods 19 and 20. By connecting both ends of the tool 121 and the lower ends of the link rods 19 and 20, the link rods 19 and 20 are held in a prescribed inclined posture, and the track frame 17 is attached to the link rods 19 and 20. Therefore, when the crawler type traveling device 13 is assembled, the link rods 19 and 20 can be prevented from hanging down due to their own weight, and the assembling workability is improved. Reduces assembly man-hours and shortens the assembly time.

  As shown in FIGS. 13 to 17, a pair of front and rear link shafts 30 and 31 that pivotally support the track frame 17 and the link rods 19 and 20 are fitted into the link rods 19 and 20. The at least one link shaft is provided with a retaining jig 131 that connects both ends of the pitching jig 121 and the link shafts 30 and 31 and prevents the link shafts 30 and 31 from falling off at least one side. 30, 31 and the corresponding link rods 19, 20 are held by the retaining jig 131, and the track frame 17 is assembled to the link rods 19, 20. When the track frame 17 is assembled, the link shafts 30, 31 can be prevented from falling off the link rods 19, 20. The assembly work can be stabilized. Assembling workability is improved, and the number of assembling steps can be reduced and the assembling time can be shortened.

  As shown in FIGS. 13 to 17, driven wheels 21 and 23 attached to the front and rear of a track frame 17 supported by the traveling body 11 through a link mechanism so as to be able to swing back and forth, and positioned above the track frame 17. The crawler type traveling device 13 is constructed by winding a crawler belt 25 around a driving wheel 16 attached to the rear axle 15, and the assembly method of assembling the track frame 17 and the driving wheel 16. The crawler belt 25 is wound around to form a unit, the inclined posture of the pair of front and rear link rods 19 and 20 constituting the link mechanism is defined by a pitching jig 121, and the drive wheel 16 is moved to the rear axle 15 Since the track frame 17 is assembled to the link mechanism from the outer side in the body width direction, the drive wheel 16, the track frame 17, and the crawler belt 2 If it can be assembled bets on the traveling machine body 11 as one unit at the same time, can be assembled the link mechanism and said track frame 17 easily. Assembling workability is improved, and the number of assembling steps can be reduced and the assembling time can be shortened.

8 Engine 11 Traveling machine body 12 Front wheel 13 Crawler type traveling device 15 Rear axle 16 Drive wheel 17 Track frame 19 Front link rod 20 Rear link rod 21 Front driven wheel 23 Rear driven wheel 25 Traveling crawler (track)
26 Rolling wheel 30 Front lower end link shaft 31 Rear lower end link shaft 77 Bearing cylinder

Claims (5)

An assembly structure of a crawler type traveling device configured by assembling a crawler unit on the traveling machine body side ,
The traveling machine body side includes a link mechanism, a rear axle case in which the rear axle is arranged and the link mechanism is provided, and a traveling machine body in which the rear axle is provided,
The crawler unit is wound around a track frame, a driven wheel attached to the track frame, a driving wheel connected to the track frame via an assembly jig, and the driven wheel and the driving wheel. Consisting of crawler tracks,
An assembly structure of a crawler type traveling device , wherein the crawler unit is assembled to the traveling machine body side by connecting the link mechanism and the track frame and by connecting the rear axle and the driving wheel. . The link mechanism includes a pair of front and rear link rods,
The track frame is provided with a pair of front and rear link shafts that are formed in a two-step tapered shape with a small diameter on the track frame side,
The pair of front and rear link rods and the pair of front and rear link shafts are rotatably connected, so that the track frame is attached to the rear axle case via the pair of front and rear link rods and the pair of front and rear link shafts. The crawler type traveling device assembly structure according to claim 1, wherein the crawler type traveling device is connected so as to be swingable back and forth.   The assembly structure of the crawler type traveling device according to claim 2, wherein a pitching jig that regulates an inclination posture of the two link rods to a predetermined posture is attached to the pair of front and rear link rods. At least one link rod of the pair of front and rear link rods is provided with a retaining jig,
Of the pair of front and rear link shafts, the one link shaft corresponding to the one link rod is fitted into the retaining jig, so that the one link shaft falls off from the one link rod. The assembly structure of the crawler type traveling device according to claim 3, wherein the structure is prevented. A crawler belt is wound around a driven wheel attached to the front and rear of a track frame that is supported by a traveling machine body via a link mechanism so as to be able to swing back and forth, and a drive wheel attached to a rear axle located above the track frame. An assembly method of the crawler type traveling device configured as described above,
The track frame and the driving wheel are connected to an assembly jig, the crawler belt is wound around to form a unit, and the inclination posture of the pair of front and rear link rods constituting the link mechanism is defined by a pitching jig, and the drive Assembling the wheel to the rear axle and the track frame to the link mechanism from the outside in the body width direction,
Assembling method of crawler type traveling device.

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