JP5568269B2 - Ride type rice transplanter - Google Patents

Description

The present invention relates to a riding type rice planting machine.

  There is a riding type rice transplanter as an example of a 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 as an example of a working device is attached to the rear part of the traveling machine body so that the height can be adjusted. . The traveling machine body is provided with a seat and a steering handle and is equipped with an engine, and traveling and seedling work are performed by power from the engine. The front side of the seat is the control floor.

  The traveling machine body usually has a framework (chassis) made of steel such as a steel pipe or a channel material, and generally has left and right side frames extending long in the front-rear direction as the main members of the framework. The left and right side frames are connected by a horizontally long member.

  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. The link device is generally composed of a top link and a lower link separated vertically.

Patent Document 1 as an example of the arrangement of the hydraulic cylinder is arranged in an inclined position which is higher etc. ho go behind the hydraulic cylinder in a side view, linking the rear and lower link of the hydraulic cylinder with the intermediate link Is disclosed. On the other hand, in Patent Document 2, a hydraulic cylinder is disposed in an inclined posture that becomes lower toward the rear end, while a hitch attached to a seedling planting device is connected to the rear end of the top link and the rear end of the lower link, It is disclosed that the rear end is connected to a hitch.

JP 2002-335708 A Japanese Patent No. 3318184

  Now, there are two types of engine arrangements in passenger rice transplanters: a front mount system in which the engine is placed in front of the control floor, and a mid-mount method in which the engine is placed behind the control floor. Can be said to be advantageous in terms of design because of limited space.

  Therefore, when discussing Patent Documents 1 and 2, both patent documents are directed to the front mount system. If Patent Document 1 is a mid-mount system, the engine must be installed to avoid interference between the engine and the hydraulic cylinder. If it has to be arranged in front of the hydraulic cylinder, there arises a problem that the overall length of the traveling machine body becomes long.

  On the other hand, in Patent Document 2, a support unit having a trapezoidal shape in a side view is provided in a lower part of a seat in a traveling machine body, and a front end of a hydraulic cylinder and a front end of a top link are connected to a connecting pipe disposed on the support unit. However, even in this Patent Document 2, since the engine has to be arranged in front of the trapezoidal support portion, there is a problem that the total length of the traveling machine body becomes long when diverted to the mid-mount system.

The present invention has been made to improve such a current situation, and an object thereof is to provide a more improved riding type rice transplanter .

The riding type rice transplanter according to the present invention is capable of moving up and down via a traveling machine body (1) that is self-propelled by the power of the engine (18) and a link device (27) (28) at the rear part of the traveling machine body (1). A working device (2) attached thereto, and a cylinder (30) connected to the traveling machine body (1) and the link devices (27) (28) so as to be relatively rotatable, whereby the cylinder ( The basic structure is that the link devices (27) and (28) rotate and the work device (2) moves up and down when 30) expands and contracts.

In the invention of claim 1, the traveling machine body (1) has an operation floor (10a) on which an operator puts his / her foot while seated, and the engine (18) is located behind the operation floor (10a). The cylinder (30) is disposed behind the engine (18), and the traveling machine body (1) includes left and right side frames (12) extending in the front-rear direction and the side frames (12). ) Having a left and right longitudinal rear frame (14) fixed to the rear end, and a pair of left and right rear columns (26) for supporting the rear frame (14) from below, the engine (18) while being placed in front of the rear pillar (26), said side frame (12) is arranged closer to the right and left outer side of the engine (18), the rear end side has a high enough height to go back Ramps rear is inclined in a side view in so that has become (12a), the inclined portion of the rear side of the side frame (12) (12a) and said rear frame (14) and the rear strut (26) And the front end of the link device (27) (28) is connected to the left and right rear columns (26), and is higher than the upper end of the engine (18). The front end side of the cylinder (30) is connected between the two rear struts (26) in the rear frame (14), and the rear end side of the cylinder (30) is connected to the link device (27) (28). The engine (18) is disposed in a tilted posture in which the cylinder bore is tilted backward with respect to a vertical line, and the rearward tilt angle of the engine (18) is set. Said side Inclined portion of the over arm (12) is set equal to the inclination angle of (12a).

  In the present invention, in the system in which the engine is disposed behind the control floor, the front side of the cylinder for raising and lowering the work device is the engine placement space, so that the front-rear distance between the engine and the cylinder can be made as short as possible. (In some cases, it is possible to partially overlap the engine and the cylinder in plan view). As a result, it is possible to prevent the overall length of the traveling machine body from becoming excessively long in the mid-mount riding planting machine.

When the link device is rotated by the cylinder, in order to effectively use the cylinder force, it is preferable that the pulling force of the cylinder is made to act as the upward pulling force of the link device as much as possible. It is preferable to be in a high position. In this regard, if the configuration of claim 1 is adopted, there is an advantage that the working device can be efficiently raised even if the height of the engine is the same as the conventional one.

  If the structure of Claim 1 is employ | adopted, since the cylinder and the link apparatus are connected with the frame material which comprises a traveling body, the complication of a structure can be prevented and it can contribute to a cost reduction.

  Many of the link devices of the riding type rice transplanter constitute a parallel link mechanism with the top link and the lower link, and the invention of claim 1 follows this point. In the first aspect of the invention, since the front end of the top link is connected to the rear column and the front end of the cylinder is connected to the rear frame, a large moment can be applied to the link device by the cylinder. The device can be moved up and down more smoothly.

It is an overall side view of a rice transplanter. It is a whole top view of a rice transplanter. It is a side view which shows the framework of a traveling machine body. It is a top view which shows the framework of a traveling machine body. It is a perspective view which shows the framework of a traveling machine body. It is a side view which shows the support structure of an engine. It is a separated top view which shows the support structure of an engine. It is a separation perspective view showing a support structure of an engine. It is the perspective view which looked at the traveling body from back. It is the isolation | separation perspective view which looked at the traveling body from back.

  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 description, the words “front and rear” and “left and right” are used to specify the direction, but these words are based on the direction of the driver seated in the forward direction unless otherwise specified. .

(1). Outline of rice transplanter First, the outline of rice transplanter will be explained. As shown in FIGS. 1 and 2, the rice transplanter has a traveling machine body 1 and a seedling planting device 2 as main elements, and the traveling machine body 1 has left and right front wheels 3 and a rear wheel 4. The seedling planting device 2 is a method of scraping seedlings one by one from the seedling mat with planting nails, and has a seedling table, a feeding device, a rotary planting mechanism, etc., but is not directly related to the present invention. Therefore, the description is omitted (the planting mechanism is omitted in FIG. 2).

  The traveling machine body 1 includes a seat 5 with a backrest on which a driver sits and a steering handle 6 disposed in front of the seat. The seat 5 and the steering handle 6 are disposed at the left and right intermediate positions of the traveling machine body 1. The steering handle 6 is provided in a steering mechanism portion covered with a bonnet 7. In addition, spare seedling stands 8 are provided on the left and right sides in front of the seat 5, and a fertilizer application device 9 is provided behind the seat 5. As shown in FIGS. 1 and 2, a portion of the traveling machine body 1 on which a person is placed is covered with a vehicle body cover 10, and a control floor 10 a on which an operator is placed is constituted by the vehicle body cover 10.

  For example, as can be clearly understood from FIG. 5, the traveling machine body 1 includes left and right side frames 12 extending in the front-rear direction, a front frame 13 in which the left and right side frames 12 are connected at the front end portion, and left and right side frames 12. It has a left and right rear frame 14 connected to the rear end. The side frame 12, the front frame 13, and the rear frame 14 constitute a vehicle body frame (chassis) that forms the core of the framework of the traveling machine body 1. A bumper 15 is disposed in front of the side frame 16.

  The side frame 12 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. In other words, the rear half of the side frame 12 is an inclined portion 12a that increases in height toward the rear. The left and right side frames 12 are fixed to the left and right side frames 12 by outward welding and projecting outward branch frames 16, and the preliminary seedling stand 8 is fixed to the two outward branch frames 12 positioned in front. . Further, auxiliary frames 17 extending in the front-rear direction are arranged in parallel to each other on the left and right outer sides of the side frame 12 in plan view. The auxiliary frame 17 is welded to the outward branch frame 16.

For example, as can be understood from FIG. 3, the portion located below the inclined portion 12a of the side frame 12 on the side face view, is arranged in a posture in which the engine 18 has a crankshaft on the left and right horizontally, in front of the engine 18 In addition, a mission case 19 constituting a transmission is disposed below the horizontal portion of the side frame 12. The mission case 19 is covered from above with a control floor 10 a of the vehicle body cover 10. In other words, the mission case 19 is disposed below the control floor 10a. Needless to say, a transmission element such as a gear group, a clutch, and a brake is built in the mission case 19.

  While the crankshaft of the engine 18 is exposed on the left side, a hydrostatic continuously variable transmission (HST) 20 is attached to the left side surface of the transmission case 19, and the power of the engine 18 is driven by a belt 21 (HST). 20 is sent. The engine 18 is arranged in an inclined posture in which the cylinder bore is inclined backward with respect to the vertical line, and the backward inclination angle is substantially the same as the inclination angle of the inclined portion 12 a in the side frame 12.

  A front axle device 22 is attached to the left and right side surfaces of the front portion of the transmission case 19, and the front wheel 3 is rotatably supported by the front axle device 22. The seat 5 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 12a of the side frame 12 in a side view. On the other hand, the engine 18 is also generally disposed at the left and right intermediate portion of the traveling machine body 1 and, as can be understood from FIG. 3, the front portion thereof is disposed at the front and rear positions overlapping the seat 5 in plan view. Therefore, the engine 18 protrudes behind the seat 5 at a rate of about half of the rear or more. There is a space between the seat 5 and the engine 18, and the fuel tank 23 is disposed in this space.

  A rear axle case 25 is disposed obliquely behind the engine 18, and the rear wheel 4 is fixed to the rear axle protruding left and right from the rear axle case 25 so as not to be relatively rotatable. As shown in FIG. 5, the rear axle case 25 has a configuration in which left and right rearwardly projecting portions 25b are projected from a left and right longitudinal base portion 25a as shown in FIG. Provided. Further, a rear column 26 is fixed to a step provided inside the left and right rearward projecting portions 25 b via a bracket 26 a, and the rear column 26 is fixed to the rear frame 14. The rear column 26 is slightly inclined forward in side view.

  As shown in FIG. 3, a link mechanism comprising a top link 27 and a lower link 28 is connected to the rear end of the traveling machine body 1, and a seedling planting device is connected to a hitch 29 connected to the rear ends of both links 27, 28. 2 are connected. The top link 27 is connected to the rear column 26 so as to be rotatable up and down, and the lower link 28 is connected to the rear column 26 so as to be rotatable up and down. The link mechanism is rotated up and down by a hydraulic cylinder 30 connected to the rear frame 14. Details of these will be described later.

(2) Member connection structure For example, as shown in FIGS. 7 and 8, the transmission case 19 and the rear axle case 25 are connected by a joint member 31. The joint member 31 has a hollow rectangular shape. 4 and 5, a power steering unit 33 is fixed to the front frame 13 via a front bracket 32, and the power steering unit 33 and the front end portion of the transmission case 19 are fixed with bolts. ing. Therefore, in this embodiment, the power steering unit 33 also serves as the structural material of the traveling machine body 1.

  As can be understood from FIG. 7, the transmission case 19 roughly has a hollow structure in which the left and right cases are fastened with bolts. As shown in FIG. 6, the joint member 31 has the holding member 34 at the rear and the lower part thereof. Is fixed through. The rear side of the portion of the transmission case 19 where the HST 20 is attached is notched, and therefore the left side of the transmission case 19 is uneven in plan view, and the drive shaft 35 faces backward from this step portion. It is extended to. The drive shaft 35 is connected to the rear axle case 25. For example, as can be understood from FIG. 8, the rear end of the joint member 31 is fastened to the front surface of the rear axle case 25 with a bolt via an end plate 36.

  For example, as shown in FIG. 7, a work power output unit 38 projecting sideways is provided at the rear of the right side surface of the mission case 19, and a work power output shaft 39 extends backward from the work power output unit 38. ing. The work power output shaft 39 is connected to the inter-case 40 shown in FIGS. 4 and 5. From the inter-case 40, a planting drive shaft (PTO shaft) 41 (see FIG. 3) protrudes backward, and fertilization is performed. A drive shaft (not shown) protrudes upward.

  Next, the support structure of the engine 18 will be described. For example, as shown in FIG. 8, the engine 18 has a front portion attached to a front bracket 42 fixed to the joint member 31 and a rear portion attached to the rear axle case 25 via a rear bracket 43. The front bracket 42 includes left and right foot portions 44 fixed to the side surfaces of the joint member 31 and an upper member 45 disposed so as to be inserted between the left and right foot portions 44.

  The foot portion 44 is made of a channel material and spreads to the left and right as it goes upward in a front view. For this reason, the left and right foot portions 44 have a substantially V-shaped posture. The upper member 45 is mounted on the foot portion 44 via a cylindrical front vibration isolating rubber 46, and the upper member 45, the front vibration isolating rubber 46 and the foot portion 44 are integrally fastened by a bolt. A front flange 18a of the engine 18 is fastened to the upper member 45 with bolts and nuts.

  The drive shaft 35 passes through a space surrounded by the front bracket 42 and the joint member 31. The rear bracket 43 is attached to the base 25 a of the rear axle case 25 via an auxiliary bracket 47 and a rear vibration isolating rubber 48. The rear flange portion 18b of the engine 18 is fastened to the rear bracket 43 with bolts.

  As can be understood from FIGS. 1, 3, and 6, the engine 18 is arranged close to the rear column 26. In other words, the space for the engine 18 is vacant in front of the rear column 26. Further, as can be understood from FIG. 7, the engine 18 is disposed with a sufficient margin in the space between the left and right side frames 12. Accordingly, a space in which the engine 18 can be disposed is vacant in front of the rear frame 14 and the rear column 26. In other words, the engine 18 can be as close as possible to the rear frame 14 and the rear column 26, and thus, the mid-mounting of the engine 18 can be realized while preventing the traveling machine body 1 from being lengthened.

(3) Link device Next, the link device will be described. For example, as shown in FIGS. 9 and 10, the top link 27 has only one trunk portion 27 a at the rear end portion and most of the bifurcated portion 27 b, and the distance between the forked portion 27 b increases toward the front. . Therefore, the top link 27 as a whole has a Y-shape in plan view (of course, other progress bodies such as a ladder shape may be used). The front end portions of the left and right bifurcated portions 27 b are connected to the inner surface portion of the upper end portion of the rear column 26 by left and right longitudinal first pins 50, respectively, and the rear end portion of the trunk portion 27 a is connected to the upper portion of the hitch 29 and the left and right longitudinal second pins 51. It is connected with.

  A first bearing cylinder 52 into which the first pin 50 is fitted is fixed to the upper end portion of the rear column 26 by welding. The first bearing cylinder 52 protrudes from the left and right sides of the rear column 26, and thus the first pin 50 is stably supported.

  The lower link 28 has left and right side members 28a made of square pipes. The left and right side members 28a have a second bearing cylinder 53 that is a left and right longitudinal shaft that penetrates through the front end of the lower link 28 and a center reinforcement 54 that is disposed at a substantially front and rear middle portion. And are connected together. Accordingly, the lower link 28 is roughly in the form of a ladder. The second bearing cylinder 53 is exposed to the left and right outer sides of the left and right members 28a, and the lower link 28 is rotatably connected to the rear column 26 by a third pin 55 via the third bearing cylinder 53. A fourth bearing cylinder 56 having a boss portion 56a that fits from the inside to the third bearing cylinder 53 is fixed to the rear support column 26. Actually, the support function of the second bearing cylinder 53 is the fourth bearing cylinder 56. Is responsible.

  The rear end portion of the lower link 28 is rotatably connected to the lower portion of the hitch 29 by a fourth pin 57 that is long in the left-right direction. Although not clearly shown in the figure, a bearing cylinder into which the fourth pin 57 is fitted is welded to the lower part of the hitch 29.

  A left and right intermediate portion of the rear frame 14 and a rear portion of the lower link 28 are connected by a hydraulic cylinder 30. The hydraulic cylinder 30 has a cylindrical body 30a and a piston rod 30b, and the front end portion of the cylindrical body 30a is connected to a hanger bracket 58 welded to the rear frame 14 by a fifth pin 59 that is long on the left and right. The rear end portion (front end portion) of 30b is connected to the lower link 28 by a sixth pin 60 that is long in the left-right direction. The hanger bracket 58 protrudes approximately downward from the rear frame 14. For this reason, the hanger bracket 58 does not get in the way when the fertilizer application device 9 is supported by the rear frame 14.

  As can be understood from FIG. 9, a bearing plate 30 c is fixed to the rear end of the piston rod 30 b, and this bearing plate 30 c is connected to the lower link 28 by a sixth pin 60. A reinforcing member 61 that surrounds the sixth pin 60 from the front side is fixed to the left and right side members 28a constituting the lower link 28. For this reason, high strength can be secured without making the sixth pin 60 excessively thick. The reinforcing member 61 is formed with an escape groove for allowing the bearing plate 30c to rotate.

  Needless to say, when the hydraulic cylinder 30 is contracted, both links 27 and 28 are rotated so that the tip ends are raised, and as a result, the hitch 29 is raised. Conversely, when the hydraulic cylinder 30 is extended and operated, the links 27 and 28 are rotated so that the rear ends thereof are lowered, and as a result, the hitch 29 is lowered. Of course, the hydraulic cylinder 30 also rotates around the fifth pin 59 while expanding and contracting. An accumulator 30d is provided at the rear end of the cylindrical body 30a constituting the hydraulic cylinder 30.

  The hitch 29 has a U-shaped cross-section that opens backward, and a cover 62 is attached to the rear surface. Although not shown, a bearing cylinder into which the fourth pin 57 is fitted is fixed to the hitch 29. Further, a king pin 63 protrudes backward at the lower end of the hitch 29, and the seedling planting device 2 is fixed to the king pin 63. The upper part of the hitch 29 and an auxiliary support (not shown) of the seedling planting device 2 are connected via a rolling control device 64. The hitch 29 also constitutes the link mechanism described in the claims, and therefore the hydraulic cylinder 30 can be connected to the hitch 29.

(4) Summary Now, when the link device is moved up and down by one hydraulic cylinder 30, it is reasonable to arrange the hydraulic cylinder 30 at the left and right intermediate portion of the traveling machine body 1. On the other hand, it is reasonable to arrange the engine 18 at the left and right intermediate portions of the traveling machine body 1 in terms of balance and the like. In this embodiment, since the hydraulic cylinder 30 is connected to the rear frame 14, the engine 18 is arranged as far back as possible so as to approach the rear column 26 while the hydraulic cylinder 30 is arranged in the left and right intermediate portions. it can. This can prevent the traveling machine body 1 from becoming long. In addition, since the link device is directly pushed and pulled by the hydraulic cylinder 30 and rotated, it is mechanically excellent.

The hydraulic cylinder 30 may be connected to the left and right rear columns 26 with pins. However, if the hydraulic cylinder 30 is connected to the rear columns 26, a problem of bending of the pins may occur. On the other hand, when it is connected to the rear frame 14 as in the present embodiment, the pin 59 may be very short, so that the problem of bending does not occur. When the top link 27 in the form of a Y-shaped in plan view (or ladder), the hydraulic cylinder 30 can advantageously be connected to the rear frame 14 rather Do interfere with this and top link 27.

  Although it is possible to connect the top link 27 to the rear frame 14, in this case, a dedicated bracket must be welded to the rear frame 14. On the other hand, if it connects with the rear support | pillar 26 like this embodiment, it is not necessary to weld a bracket, and there exists an advantage which contributes to cost reduction by simplifying a structure so much. Further, if the rear column 26 is supported by the rear axle case 25, the rear axle case 25 can be used as a strength member (frame member) of the traveling machine body 1, and therefore, it is possible to contribute to weight reduction and structural simplification of the traveling machine body 1 as a whole. .

(5). Others The present invention can be embodied in various ways other than the above embodiment. For example, the application target is not limited to a riding type rice transplanter, but can also be applied to other riding type farm working machines such as a cocoon coating machine and a vegetable transplanting machine.

  Further, it is not always necessary to use the rear axle case for the framework of the traveling aircraft body, and the present invention can also be applied to a type in which a chassis is constituted by a frame structure and an engine is mounted on the frame structure. The member to which the link device and the cylinder are attached may be selected according to the basic structure of the traveling machine body.

  The invention of the present application is specifically applied to a riding type rice transplanter and exhibits usefulness, and thus can be used industrially.

DESCRIPTION OF SYMBOLS 1 Traveling machine body 2 Seedling planting device as an example of working device 3, 4 Wheel 5 Seat 6 Handle 10a Steering floor 12 Side frame 14 Rear frame 18 Engine 19 Transmission case 25 Rear axle case 26 Rear column 27 Top link constituting link device 28 Lower link constituting link device 29 Hitch 30 Hydraulic cylinder (lifting cylinder)

Claims (1)

A traveling machine body (1) that is self-propelled by the power of the engine (18), and a work device (2) that is attached to a rear portion of the traveling machine body (1) through link devices (27) and (28) so as to be movable up and down. When the cylinder (30) expands and contracts by connecting the cylinder (30) to the traveling machine body (1) and the link devices (27) (28) in a relatively rotatable manner, the link device (27) (28) rotates and the work device (2) is configured to move up and down,
The traveling machine body (1) has a control floor (10a) on which an operator puts his / her foot in a seated state, and the engine (18) is disposed behind the control floor (10a), and the cylinder (30 ) Is located behind the engine (18)
The traveling machine body (1) includes left and right side frames (12) extending in the front-rear direction, a left and right rear frame (14) fixed to a rear end of the side frame (12), and the rear frame (14 ) And a pair of left and right rear columns (26) for supporting the engine (18) from below, and the engine (18) is disposed in front of the rear column (26),
The side frame (12) is disposed on the left and right outer sides of the engine (18), and an inclined portion (12a) whose rear portion is inclined in a side view so that the height of the rear end side increases toward the rear. The space surrounded by the inclined portion (12a) on the rear side of the side frame (12), the rear frame (14), and the rear column (26) is used as an engine mounting space.
Furthermore, the front ends of the link devices (27) and (28) are connected to the left and right rear columns (26), and the two rear columns are arranged in the rear frame (14) at a position higher than the upper end of the engine (18). wherein connecting the front end of the cylinder (30) between (26), which connects the rear end of the cylinder (30) to the lower link (28) constituting said link device (27) (28) ,
The engine (18) is arranged in an inclined posture in which the cylinder bore is inclined backward with respect to a vertical line, and the backward inclination angle of the engine (18) is set as the inclination angle of the inclined portion (12a) of the side frame (12). Is set the same as
Riding type rice transplanter .

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