JP5443797B2 - Riding machine - Google Patents

Description

  The present invention relates to a riding-type agricultural work machine such as a riding-type seedling transplanter represented by a riding-type rice transplanter.

  There is a riding type rice transplanter as an example of the riding type farm working machine. This riding type rice transplanter has a traveling machine body supported by left and right front wheels and left and right rear wheels, and a seedling planting device is attached to the rear part of the traveling machine body so that the height can be adjusted. In addition, a seat and a steering handle are disposed on the traveling machine body, and an engine is mounted, and traveling and seedling work are performed by power from the engine. The seedling planting device and the traveling machine body are connected by a link device so as to be relatively rotatable, and the traveling machine body and the link device are connected by a hydraulic cylinder. Accordingly, when the hydraulic cylinder is expanded and contracted, the seedling planting device moves up and down.

  In a riding agricultural machine, a lifting link device generally has a top link and a lower link that are separated vertically. The front ends of these top links and lower links are rotatably connected to the frame of the traveling machine body, and a vertical hitch (back link) is relative to the rear ends of the top links and lower links. Therefore, the link device constitutes a parallel link mechanism as a whole. A seedling planting device is connected to the hitch so that it can rotate left and right (rollable), and a cylinder is connected to the lower link and the traveling machine body.

  Forms of the top link and the lower link are also various. For example, Patent Documents 1 and 2 describe that both the top link and the lower link are configured by two members on the left and right extending in parallel. On the other hand, Patent Document 3 describes that the top link is constituted by one member and the lower link is constituted by two left and right members.

Japanese Patent No. 3238328 Japanese Patent No. 3450642 Japanese Patent Laid-Open No. 10-52126

  Now, it can be said that it is preferable that the weight is as light as possible because the agricultural machine runs on the field. In particular, the rice transplanter travels through a field made of mud, and therefore demands for weight reduction are high. Therefore, consideration should be given to reducing the weight of each member without impairing the function.

  Therefore, when examining each cited document, if both the top link and the lower link are composed of two left and right members extending in parallel as in cited documents 1 and 2, the strength can be increased, but the weight can be reduced. There is a problem that is difficult. In addition, the hitch may be equipped with a rolling control device for correcting the horizontal tilt of the seedling planting device, but the rolling control device must be arranged so as not to interfere with the top link. The arrangement of the rolling control device may be troublesome.

  On the other hand, in Patent Document 3, since the top link is mainly composed of a single member extending in the front-rear direction, the structure can be simplified, contributing to weight reduction, and easy to design even when a rolling control device is attached to the hitch. There is an advantage to become.

  The invention of the present application is intended to improve the link device for raising and lowering the working device, and follows the simplicity of the structure found in Patent Document 3, while achieving better performance in terms of strength and the like. It is.

The riding-type agricultural work machine according to the present invention has a traveling machine body that has front and rear wheels and can be self-propelled, and a work apparatus that is attached to a rear part of the traveling machine body through a link device so as to be movable up and down. In the riding type agricultural work machine, the link device is connected to the traveling machine body and the link device so as to be relatively rotatable with each other, so that when the cylinder expands and contracts, the link device rotates and the working device moves up and down. device has a top link and a lower link disposed vertically, the top link, the Y-shaped in plan view and a bifurcated portion of the now branched V-shaped with one executive around the longitudinal Forming.

The top link is composed of two U-shaped channel members having the same shape, and the channel members are arranged so as to open opposite to each other, and their end portions are fitted to each other and connected. Thus, the trunk portion is formed, and the bifurcated portion is disposed in a posture toward the traveling machine body and the trunk portion is directed toward the working device .

In the present inventions, since the top link is Y type form, it is possible to reduce the weight as compared with the type having the two right and left members, and by extension to contribute to weight reduction of riding agricultural machine obtain. Further, since it is Y-shaped, the rigidity against torsion and bending is remarkably higher than that of a single member, so that high strength can be ensured while being lightweight.

DOO Uplink because forked portion is connected to the traveling machine body, has excellent support stability against lateral rolling of riding agricultural machine.

It is an overall side view of a rice transplanter. It is a whole top view of a rice transplanter. It is a general perspective view of a rice transplanter. It is a side view of a traveling machine body. It is a schematic bottom view of a traveling body. It is a perspective view which shows the framework of a traveling machine body. (A) is a perspective view which shows the framework of a seedling planting device, (B) is a schematic perspective view of a seedling planting device. It is a rear view of the part centering on the link device. (A) is a top view of the part centering on a link device, (B) is a BB view sectional view of (A), and (C) and (D) are other examples. It is the perspective view which looked at the part centering on the link apparatus from the downward direction. It is a separation rear view of a rear column and a rear axle case. It is a perspective view which shows a rear support | pillar, a cylinder, and a top link. It is the perspective view which looked at the part centering on the link apparatus from diagonally upward.

  Next, an embodiment of the present invention will be described with reference to the drawings. This embodiment is applied to a riding type rice transplanter (hereinafter simply referred to as “rice transplanter”). In the following explanation, the words “front and rear” and “left and right” are used to specify the direction. Unless otherwise specified, these words are based on the driver sitting in the forward direction of the rice transplanter. it's shown.

(1). Outline of rice transplanter First, the outline of rice transplanter will be explained. As can be easily understood from FIGS. 1 to 3, the rice transplanter has a traveling machine body 1 and a seedling planting device 2 as main parts, and the seedling planting device 2 is connected to the rear part of the traveling machine body 1 via a link device 3. It is connected to the hoist freely. The traveling machine body 1 is supported by left and right front wheels 4 and rear wheels 5, and the front wheels 4 and the rear wheels 5 are driven by power.

  The traveling machine body 1 includes a seat 6 with a backrest on which a driver sits and a steering handle 7 disposed in front of the seat. The seat 6 and the steering handle 7 are disposed at the left and right intermediate positions of the traveling machine body 1. Preliminary seedling stands 8 are arranged in front of the seat 6 and on the left and right sides.

  For example, as can be clearly understood from FIG. 6, the traveling machine body 1 includes left and right side frames 9 extending in the front-rear direction, a front frame 10 in which the left and right side frames 9 are connected at the front end portion, and left and right side frames 9. It has a left and right longitudinal rear frame 11 connected to the rear end. The side frame 9, the front frame 10, and the rear frame 11 constitute a vehicle body frame (chassis) that forms the core of the traveling machine body 1. A bumper 12 is disposed in front of the side frame 9, and the rear frame 11 is supported by two left and right rear columns 13.

  The side frame 9 is bent so that a substantially front half portion is in a substantially horizontal posture and a rear half portion is in a backward inclined posture with a front and rear intermediate portion as a boundary. That is, the substantially second half portion of the side frame 9 is an inclined portion 9a whose height increases as going backward. A plurality of outward branch frames 14 projecting outward in the left and right directions are fixed to the horizontal portion of the side frame 9.

  Further, auxiliary frames 15 extending in the front-rear direction are arranged in parallel on the left and right sides of the side frame 9, and the auxiliary frame 15 is welded to the outward branch frame 13 and the rear frame 11. Therefore, the rear frame 11 protrudes to the left and right outside of the side frame 9 (projects). Further, as shown in FIG. 2, the rear wheel 5 is located at a portion between the side frame 9 and the auxiliary frame 15 in plan view.

  For example, as can be understood from FIG. 4, the engine 16 is disposed in a portion of the side frame 9 that is located below the inclined portion 9 a in a side view, and a gear is disposed in front of the engine 16 and at a position lower than the side frame 9. A mission case 17 containing a group is arranged. The engine 16 is arranged such that the crankshaft 18 extends in the left-right direction, and power is transmitted to the inside of the transmission case 17 by a pulley and a belt 19. A front axle device 20 is attached to the left and right side surfaces of the front portion of the transmission case 17, and the front wheels 4 are rotatably supported via the front axle device 20.

  For example, as can be understood from FIG. 5, the engine 16 is disposed at a position along the longitudinal center line of the traveling machine body 1 (that is, the engine 16 is disposed at the left and right intermediate portion of the traveling machine body 1). Further, for example, as clearly shown in FIG. 4, the engine 16 is arranged in a posture in which the crankshaft 18 is positioned in front and the cylinder bore is inclined backward.

  The seat 6 is positioned substantially at the middle of the left and right sides of the traveling machine body 1 and generally above the front half of the inclined portion 9a of the side frame 9 in a side view. As can be understood from FIG. 4, the front portion of the engine 16 overlaps with the seat 6 in plan view, and the engine 16 protrudes greatly behind the seat 6 in plan view and side view.

  A fuel tank 21 is disposed between the seat 6 and the engine 16. The front end of the fuel tank 21 is located slightly behind the front end of the seat 6, while the rear end of the fuel tank 21 protrudes slightly behind the rear end of the seat 6.

  As shown in FIGS. 1 to 4, a fertilizer application device 22 is disposed behind the seat 6. The fertilizer application device 22 is provided with the same number of hoppers as the number of planting strips, and the fertilizer stored in the hoppers is dropped onto the seedling stock by the hose in synchronization with the planting timing by the feeding action of the blower. The fertilizer application device 22 is supported by the rear frame 11.

  A rear axle case 25 is disposed behind the mission case 17 and obliquely behind the engine 16, and the rear wheel 5 is attached to a rear axle 26 that protrudes outward from the rear axle case 25 to the left and right. In addition, as shown with a dashed-two dotted line in FIG. 2, the auxiliary | assistant wheel 27 may be attached to the rear axle 26 in the case of a farm field with deep mud.

  As shown in FIGS. 5 and 11, the left and right end portions of the rear axle case 25 are projecting portions 25a projecting rearward, and the rear axle 26 projects outwardly from the left and right projecting portions 25a. For example, as clearly shown in FIG. 5, driving power is transmitted to the inside of the rear axle case 25 from the front portion of the transmission case 17 by the traveling drive shaft 28.

  As shown in FIG. 11, the rear axle case 25 has a step portion 25b at the base portion of the rearward projecting portion 25a, and the rear column 13 is fixed to a rear bracket 29 fastened to the step portion 25b with a bolt. . The rear column 13 is made of a square pipe, but has a square shape that is long in the front-rear direction in a cross-sectional view. This is because an external force from the front-rear direction acts on the rear column 13 strongly. For example, as shown in FIG. 4, the rear column 13 is in a posture slightly tilted forward with respect to the vertical line in a side view.

  Since the rear frame 11 uses a round pipe, the upper end of the rear column 13 is curved in a concave shape upward in a side view so as to overlap the rear frame 11 exactly. For example, as can be easily understood from FIG. 5, the distance between the left and right side frames 9 is set to approximately the same size as the left and right length of the rear axle case 25. Therefore, the distance between the left and right rear columns 13 is smaller than the distance between the left and right side frames 9.

  A portion of the traveling machine body 1 on which a person is placed is covered with an integral body cover. The vehicle body cover 30 is omitted except for FIG. A number of slits are formed in the body cover. Although a detailed description is omitted, as shown only in part in FIG. 4, an inter-strain adjustment device 31 is disposed at a position on the front side of the right side portion of the rear axle case 25, and the planting drive shaft extends from the inter-strain adjustment device 31. (PTO shaft) 32 protrudes backward. Although not shown in the figure, a fertilization drive shaft for driving the fertilizer application device 22 also protrudes upward from the inter-strain adjustment device 31. As shown in FIG. 5, the leveling drive shaft 33 protrudes from a portion of the rear axle case 25 that is slightly to the left from the middle.

(2). Outline of Seedling Planting Device Next, an overview of the seedling planting device 2 and a connecting structure by the link device 3 will be described.

  For example, as can be understood from FIG. 2 and FIG. 7, the seedling planting device 2 has four rotary-type planting devices 34 and four vertical feed belts 35 arranged at the rear end thereof, and is slightly in side view. It has a seedling stand 36 in a forward inclined posture, a leveling rotor 38 disposed in front of three floats 37 that are in contact with the farm field, and the like. Two planting devices 34 are in one set.

  As can be easily understood from FIG. 7, the seedling planting device 2 has a roughly rectangular rough frame composed of a left and right longitudinal lower support (lower guide) 41, an upper support (upper guide) 42 and a vertical left and right side support 43. It is configured. The left and right side supports 43 are also connected by a left and right auxiliary support 44 disposed at a position slightly below the upper support 42.

  The lower support 41 is an extruded product having a rearward opening groove, and the upper support 42 is an extruded product having a downward opening groove. The seedling mount 36 is attached to the lower support 41 and the upper support 42 so as to be movable left and right, and intermittent horizontal feed and vertical feed of a seedling mat (not shown) are performed by a lateral feed mechanism and a vertical feed mechanism (not shown). And done.

  The lower support 41 is provided with two planting arms 45 protruding rearward, and a pair of planting devices 34 are attached to the tip portions of both planting arms 45 so as to be rotatable (rotatable). A center bracket 46 is fixed to the left and right intermediate portions of the lower support 41, and a king pin 47 projects forward from the center bracket 46.

  A gear box is fixed to the center bracket 46 and the lower support 41, and a planting bearing 49 that opens forward is provided in a portion of the center bracket 46 below the king pin 47. A planting input shaft (not shown) protrudes from the planting bearing 49, and the planting rotation shaft and the planting drive shaft (PTO shaft) 32 shown in FIG. 4 are a universal joint and a planting drive shaft (both not shown). It is connected with. Needless to say, as the planting drive shaft (PTO shaft) 32 rotates, the planting device 34, the transverse feed mechanism, and the longitudinal feed mechanism are driven in synchronization.

  As shown in FIG. 7B, the leveling rotor 38 is connected to the seedling planting device 2 by a pair of left and right swing links 50 so as to be movable up and down. Further, the leveling device 51 having the leveling rotor 38 has a leveling input shaft 52 projecting forward, and the leveling input shaft 52 and the leveling drive shaft 31 shown in FIG. 11 are interlocking shafts with universal joints (not shown). It is connected with.

(3) Link device Next, the link device 3 will be described. For example, as shown in FIGS. 6 and 10, the link device 3 includes a top link 54 that forms the upper part, a lower link 55 that forms the lower part, and a hitch 56 that forms the rear end part. A parallel link mechanism is configured. The front end of the top link 54 and the front end of the lower link 55 are rotatably connected to the rear column 13, and the seedling planting device 2 is connected to the lower end of the hitch 56.

  For example, as shown in FIGS. 9 and 13, the top link 54 has one trunk portion 54a constituting the rear end portion and a bifurcated portion 54b extending forward from the front end, and the bifurcated portion 54b is on the front side. The interval is widened as you go. In other words, as the bifurcated portion 54b goes backward, the interval is narrowed and eventually converges to one trunk portion 54a. Accordingly, the top link 54 has a substantially Y shape in plan view, and the front end portions of the left and right bifurcated portions 54b are connected to the inner surface portion of the upper end portion of the rear column 13 by the left and right longitudinal first pins 57, respectively. The rear end portion of the trunk portion 54 a is connected to the upper portion of the hitch 56 by a second pin 58 that is long in the left-right direction.

  The top link 54 is composed of two U-shaped channel members in cross section. The channel members are arranged in such a manner that the channel members are opened facing each other, and the ends thereof are fitted together and welded to form the trunk portion 54a. ing. Although a large load is applied to the trunk portion 54a, the trunk portion 54a has a square shape and has a structure with two upper and lower ends, so that high strength can be secured. The bifurcated portion 54b remains in the channel material structure. In FIGS. 9B, 9C, and 9D, the reference numeral 54b is attached, which means an extension of the bifurcated portion 54b, and the bifurcated portion 54b and the trunk portion 54a are located at the same location. It does not mean that it exists.

  It is also possible to use a square steel pipe as the material of the top link 54. In that case, the extension portions of the two forked portions 54b can be fitted to each other by notching one side plate 54b 'shown by a one-dot chain line in FIG. 9B at the position of the trunk portion 54a. As shown in FIG. 9C, the bifurcated portion 54b can be formed of a square steel pipe and the extension portion can be overlapped and welded to form the trunk portion 54a. Also, as shown in FIG. 9C, a U-shaped channel material is used for the bifurcated portion 54b, and one of the extended portions of the two bifurcated portions 54b is expanded and deformed up and down and the other is narrowed and deformed. It is also possible to fit each other in the trunk portion 54a.

  Further, a first bearing tube 59 into which the first pin 57 is fitted is fixed to the upper end portion of the rear column 13 by welding. The first bearing cylinder 59 protrudes on both the left and right sides of the rear support column 13, and thus the first pin 57 is stably supported. The top link 54 occupies most of the entire length of the bifurcated portion 54a, but the ratio of the length of the bifurcated portion 54b and the trunk portion 54a can be arbitrarily set. Further, the top link 54 and the lower link 55 can be made of various materials such as a round pipe or a C-type channel structure.

  As clearly shown in FIG. 13, the hitch 56 has a U-shaped cross section opened rearward, and the rear end of the top link 54 is connected to the side surface of the upper end portion by a second pin 58. Yes. A second bearing tube 60 is welded to the rear end of the trunk portion 54 a of the top link 54, and a second pin 58 is inserted through the second bearing tube 60. Further, an upper recess 61 opened upward is formed at the upper end of the front plate constituting the hitch 56 in order to avoid interference with the top link 54. A cover 62 is attached to the back of the hitch 56. The cover 62 may be screwed or fixed by welding.

  For example, as can be clearly seen from FIG. 13, the lower link 55 is made of a square pipe and has left and right side members 55a that are longitudinal and longitudinal. The left and right side members 55a are third bearing cylinders that are longitudinally penetrated through the front end. 63 and a center reinforcement 64 disposed at a substantially middle part in the front-rear direction. Accordingly, the lower link 55 has a roughly ladder shape. The third bearing cylinder 63 and the center reinforcement 64 correspond to the horizontally long members recited in the claims. It is also possible to connect the left and right side members 55a with reinforcing stays.

  The third bearing cylinder 63 is exposed to the left and right outer sides of the left and right members 55a, and the lower link 55 is rotatably connected to the rear column 13 by a third pin 65 via the third bearing cylinder 63.

  For example, as shown in FIG. 10, the rear end portion of the lower link 55 is rotatably connected to the lower portion of the hitch 56 by a fourth pin 66 that is long in the left-right direction. As shown in FIG. 13, a fourth bearing tube 67 is fixed to the lower portion of the hitch 56 by welding, and a fourth pin 66 is fitted into the fourth bearing tube 67. A bearing cylinder into which the fourth pin 66 is fitted is also fixed to the rear ends of the left and right side members 55a constituting the lower link 55.

  As shown in FIGS. 10, 12, 13, etc., the left and right intermediate portions of the rear frame 11 and the rear portion of the lower link 55 are connected by a hydraulic cylinder 68 as an example of a cylinder. That is, the hydraulic cylinder 68 has a cylindrical body 68a and a piston rod 68b. For example, as shown in FIG. 13, the front end portion of the cylindrical body 68a is a fifth longitudinally left and right part of a bracket 69 welded to the rear frame 11. The piston rod 68 b is connected by a pin 70, and the rear end portion (tip portion) of the piston rod 68 b is connected to the lower link 55 by a sixth pin 71 that is long in the left-right direction. The bracket 69 protrudes approximately downward from the rear frame 11. Therefore, the bracket 69 does not get in the way of supporting the fertilizer application 22 with the rear frame 11.

  For example, as can be understood from FIG. 10, in the space between the left and right side members 55 a in the lower link 55, a pair of left and right reinforcing members 72 that surround the sixth pin 71 from the front side are disposed. The left and right reinforcing members 72 have a U-shaped cross section when viewed from the side, and have a trapezoidal shape such that the distance between the left and right reinforcing members increases in the back direction. A plate-made hook 73 is welded to the rear end of the piston rod 68 b, and the sixth pin 71 is inserted through the hook 73.

  When the hydraulic cylinder 68 is contracted and operated, the link device 3 is rotated so that the rear part thereof is raised, and as a result, the hitch 56 is raised. On the contrary, when the hydraulic cylinder 68 is extended and operated, the link device 3 is rotated so that the rear part thereof is lowered, and as a result, the hitch 56 is lowered. The hydraulic cylinder 68 rotates around the fifth pin 70 while expanding and contracting. Although the first pin 57 and the shaft center of the fifth pin 70 are close to each other, the first pin 57 is divided into left and right, so that the first pin 57 and the hydraulic cylinder 68 do not interfere with each other.

  For example, as clearly shown in FIG. 13, the lower end portion of the hitch 56 is a lower recess 74 that opens downward, and a main bearing 75 having front and rear openings is fixed to the lower recess 74 by welding. And the king pin 47 of the seedling planting device 2 is fitted into the main bearing 75 so as not to come off. For this reason, if the hitch 56 is moved up and down by expanding and contracting the hydraulic cylinder 68, the seedling planting device 2 is moved up and down.

  The king pin 47 and the main bearing 75 are fitted so as to be capable of relative rotation. Accordingly, the traveling machine body 1 and the seedling planting device 2 can relatively rotate about the axis of the kingpin 47. The upper portion of the hitch 56 is connected to the auxiliary support 44 of the seedling planting device 2 via a rolling control device 77 shown in FIGS. 2 and 14. The rolling control device 77 has a screw-type rod (not shown) that moves forward and backward by a motor, and the tip of the rod is fixed to the upper end of the hitch 56 via a bracket 78. The main body of the rolling control device 77 is fixed to the auxiliary support 44 of the seedling planting device 2 via a bracket (not shown).

  Although illustration is omitted, the seedling planting device 2 has a tilt sensor that detects a horizontal tilt angle with respect to the horizontal, and the rolling control device 77 operates based on a signal from the tilt sensor, whereby the seedling planting device 2 is operated. The device 2 is kept substantially horizontal in front view (or rear view) regardless of the left-right inclination of the traveling machine body 2.

(4) Supplementary / Advantages of Embodiment As described above, in the present embodiment, the left and right side frames 9, the front frame 10, and the rear frame 11 constitute the main body frame. Both axle cases 25 also function as structural members constituting the framework of the traveling machine body 1.

  That is, as described above, the rear axle case 25 is connected to the rear frame 11 via the rear column 13, and the transmission case 17 and the rear axle case 25 are connected to each other as shown in FIG. 79, and the front end of the transmission case 17 is fixed to the front frame 9 via a group of front brackets and a power steering unit 81.

  The transmission case 17 and the rear axle case 25 have a sturdy structure because of the function of rotatably supporting a large number of gears. The transmission case 17 and the rear axle case 25 having such a robust structure are framed members. This is also used for (structural material). Therefore, high support strength can be ensured with a simple structure.

  Although the rear frame 11 employs a round pipe, this is mainly for ease of attachment of the side frame 9 and the rear column 13 (the direction of the butting is eliminated). Of course, the side frame 9, the rear frame 11, and the rear column 13 can adopt other cross-sectional shapes.

As described above, the engine 16 is disposed in an inclined posture in a side view. For example, as can be understood from FIG. 4, the engine 16 is supported by the joint member 79 and the rear axle 25. As shown in FIG. 5, an HST (hydrostatic continuously variable transmission) 82 to which power from the engine 16 is input is attached to one side of the mission case 17, and is opposite to the HST 82 in the mission case 17. A hydraulic pump 83 for driving the hydraulic cylinder 68 and the power steering unit 81 is attached to the right side surface on the side.

  When the top link 54 is formed in a ladder shape like the lower link 55, in this case, the front end portions of the side members constituting the top link 54 are located on the left and right outside of the hitch 56. Therefore, the top link 54 and the hitch 56 Considering that the rolling control device 77 does not interfere with the top link 54 due to the relative rotation, there is a risk that the arrangement of the rolling control device 77 must be troublesome. On the other hand, when the top link 54 is shaped like a Y in plan view as in the present invention, the rear end portion of the top link 54 is not exposed to the left and right outside of the hitch 56. Therefore, the arrangement of the rolling control device 77 can be simplified.

  In addition, since the second bearing tube 60 having a length protruding to the left and right outer sides of the trunk portion 54a is welded to the trunk portion 54a of the top link 54, even if the top link 54 is formed in a Y shape, The second pin 58 can connect the hitch 56 and the top link 54 in a state where the hitch 56 and the top link 54 rotate in a swathed manner, and thus the support function of the seedling planting device 2 is not hindered.

(5). Others The present invention can be embodied in various ways other than the above embodiment. The application target is not limited to the riding type rice transplanter, but can be used in the latter half of various riding type farm working machines having link devices such as vegetable seedling transplanting and tractors. Further, as the lifting cylinder, other than hydraulic pressure such as an electric cylinder can be used.

  The length of the trunk constituting the Y-shaped link may be very short (if the embodiment is taken as an example, only the portion entering the hitch may be the trunk), and therefore The top link or the lower link or both may have an almost V-shaped appearance. Moreover, you may form the parallel part extended straight in the front-back direction at the front-end | tip of the right and left of a bifurcated part.

Possible industrial reasons

  As described above, the present invention can be embodied in a riding-type farm work machine such as a rice transplanter to improve the utility of the work machine. Therefore, it has industrial applicability.

DESCRIPTION OF SYMBOLS 1 Traveling machine body 2 Seedling planting device as an example of planting device 3 Link device 4 Front wheel 5 Rear wheel 6 Seat 7 Steering handle 9 Side frame 10 Front frame 11 Rear frame 13 Rear support 41 Lower support constituting seedling planting device 42 Seedling planting Upper support constituting the apparatus 47 King pin 54 Top link 54a Trunk part 54b Fork part 55 Lower link 56 Hitch 58 Second pin for connecting the top link and hitch 60 Second bearing cylinder 68 Hydraulic cylinder

Claims (1)

A traveling machine body having front and rear wheels and capable of self-propelling, and a work device attached to a rear portion of the traveling machine body via a link device so as to be movable up and down, and the traveling machine body and the link device are connected by a cylinder. In the riding type agricultural work machine in which the link device is rotated and the working device is moved up and down when the cylinder expands and contracts by connecting to be relatively rotatable ,
The linkage has a arranged top link and the lower link up and down the top link, in a plan view and a bifurcated portion of the now branched V-shaped with one executive around the longitudinal Y Formed into a shape ,
The top link is composed of two U-shaped channel members having the same shape, the channel members are arranged in such a manner as to open facing each other, and the end portions thereof are fitted and connected to each other. The trunk is formed, and the bifurcated portion is disposed in a posture facing the traveling machine body and the trunk is directed to the working device.
Riding type farm work machine.

Images