JP6520748B2 - Work vehicle - Google Patents

Description

  The present invention relates to a work vehicle.

There is a technology described in Patent Document 1 as a working vehicle such as a seedling transplanting machine used when carrying out a planting work of seedlings in a field, provided with an engine for transmitting power to the working vehicle.
Patent Document 1 describes that a cover for supporting a driver's seat is provided on the upper side of an engine so as to be openable and closable, and maintenance in the engine room can be improved.

Unexamined-Japanese-Patent No. 2003-252248

However, in the technology described in Patent Document 1, the cover is opened and closed only at the upper side of the engine, so the maintainability around the engine is not considered.
For this reason, when performing maintenance around the engine, there is a problem that maintenance can not be performed without removing the floor step, and there is a problem that a cover with a wide opening must be provided.
Therefore, an object of the present invention is to improve the maintainability around the engine.

The above-mentioned subject of the present invention is solved by the following solution means.
That is, according to the first aspect of the invention, in the work vehicle provided with the seat (31) on which the operator can be seated on the traveling vehicle body (2), the traveling vehicle body (2) is provided with the pivot frame (141) A cover (30) for covering a part or all of the pivoting frame (141) is provided, the seat (31) is provided on the cover (30), the pivoting frame (141), the seat (31) and the cover ( 30) is integrally rotatable, and fixing means (171) is provided for fixing the pivoting frame (141) in the open position where it is pivoted a predetermined amount upward of the machine , and the operator is provided with the seat (31) Is provided with a projection (181) for fixing the pivoting frame (141) at a normal position where the driver can sit and drive the vehicle, and the pivoting frame (141) is fixed to the frame (130) of the traveling vehicle body (2). If it is turned downward to the traveling vehicle (2) side The seat (31) is supported by the pivoting frame (141) via the seat attachment portion (154), and the fixing means (171) is provided with a hole (182) in which the projection (181) fits. The first link (172) has a first link (172) and a second link (173), and the first link (172) is a connection wall connecting the lower ends of the front and rear pair of opposing walls (172a) and the opposing walls (172a). (172b), and the first link (172) is supported by the link supporting frame (132a) of the main frame (15) of the traveling vehicle body (2) with the first link rotation center (172c) as the center And the support pipe (213) fixed to the side step (122) is provided with an auxiliary step (211) that can be used as a scaffold when the operator gets on and off, the step of the auxiliary step (211) (212) and has a horizontal portion (213a) extending in the front-rear direction, and a front support portion (213d) and a rear support portion (213b) extending upward are integrally formed before and after the horizontal portion (213a) The front support portion (213d) and the rear support portion (213b) are formed of cylindrical pipes, and the upper end (213f) of the front support portion (213d) and the rear support portion (213b) are formed. The upper end (213c) of the) is formed into a flat shape obtained by deforming a cylinder into an elongated shape, and the upper end (213f) of the front support portion (213d) and the upper end (213c) of the rear support portion (213b) The front side of the support pipe is inclined inward as the front support portion (213d) goes upward .

In the invention according to claim 2 , a cushion rubber (183) is disposed outside the hole (182), and the projection (181) allows passage of the rubber opening (183a) of the cushion rubber (183). It is a working vehicle according to claim 1, characterized in that it is configured .

In the invention according to claim 3, a cylinder (190) extending upward is provided so as to surround the outside of the engine (20), and the lower end (191) of the cover (30) is of the cylinder (190). The upper end (192) is configured to cover the lower end (191) of the cover (30) in a step-like shape, and the upper end (192) of the cylindrical portion (190) is formed at the lower end of the cover (30). The work vehicle according to claim 1 or 2, wherein the work vehicle is formed in a step-like shape corresponding to 191) .

  The invention according to claim 4 provides a floor step (35) covering the upper part of the traveling vehicle body (2), and the floor step (35) is disposed rearward with respect to the traveling direction of the traveling vehicle body (2) A rear step (121c), a center step (121b) disposed in front of the rear step (121c), and a front step (121a) disposed in front of the center step (121b); The work vehicle according to any one of claims 1 to 3, wherein the rear step (121c) is mounted on the pivoting frame (141) so as to pivot integrally with the cover (30). It is.

  According to the first related invention related to the above-mentioned claims 1 to 4, the contact portion (191) provided on the engine cover (30), and the contact portion provided on the center step (121b) A receiving portion (192) is provided, which is disposed at a position opposed to (191), and contacts the contact portion (191) when the pivot frame (141) moves to the second position. Working vehicle.

  In the second related invention, a step portion (212) used when an operator gets on / off the traveling vehicle body (2), a connection for connecting the step portion (212) and the floor step (35) A member (213), and one end (213c) of the connection member (213) has a connection portion with the floor step (35) formed into a flat shape along the longitudinal direction of the traveling vehicle body, The other end (212f) of the connection member (213) has a connection portion with the floor step formed into a flat shape along the width direction of the traveling vehicle body, and any one of the connection members (213) On the other hand, the work vehicle is characterized in that (212f) inclines inward in the width direction of the traveling vehicle body as going upward.

  (Delete)

  (Delete)

According to the first aspect of the present invention, the cover (30) and the seat (31) integrally pivot with the pivoting frame (141), so that the maintainability around the engine can be improved.
Further, the fixing means (171) for fixing the pivoting frame (141) at the open position can prevent the pivoting frame (141) and the like from falling, thereby improving safety and workability. Furthermore, according to the first aspect of the present invention, the pivoting frame (141) can be fixed by providing the projection (181) which is fixed at the normal position where the operator can sit and operate. Also, according to the invention of claim 1, the pivoting frame (141) is easily fitted to the frame (130) of the traveling vehicle body (2) by fitting the projection (181) and the hole (182). It can be fixed to improve the workability. Furthermore, according to the first aspect of the present invention, the upper end (213f) of the front support portion (213d) and the upper end (213c) of the rear support portion (213b) are formed in a flat shape and an asymmetric shape. As the strength of the support pipe (213) is improved, it can be expected to endure even if the strength of fixation is not so high. Also, according to the invention as set forth in claim 1, the front side of the support pipe (213) inclines inward as the front support portion (213d) goes upward, so that the worker takes the foot from the front side to the auxiliary step (211). It is difficult for the foot to get stuck on the support pipe (213) when changing.

According to the second aspect of the invention, in addition to the effect of the first aspect of the invention, the projection (181) passes through the rubber opening (183a) of the cushion rubber (183) so that it can be transported or transported. The opening of the cover (30) is reduced, the safety is improved, and the jumping up and rattling of the seat (31) can be reduced.

According to the invention of claim 3, in addition to the effect of the invention of claim 1 or 2 , the step shape of the lower end (191) of the cover (30) and the step of the upper end (192) of the cylindrical portion (190) By matching the shape, it becomes a form of fitting, which can suppress generation of rattling and abnormal noise.

  According to the invention of claim 4, in addition to the effect of the invention according to any one of claims 1 to 3, the cover without rotating the front step (121a) and the center step (121b) (30) can be opened, and work can be performed with the center step (121b) and the like.

  According to the first related invention, in addition to the effect of the invention according to any one of the first to fourth aspects, the contact portion (191) and the receiving portion (192) make pivot A rotational resistance easily acts on the frame (141), and it is possible to reduce the rattling (noise) during operation and the jumping of the seat (31).

  According to the second related invention, in addition to the effects of the invention described in any one of claims 1 to 4 or the first related invention, one end (213c) of the connection member (213) and the other At the end (212 f), the connection member is formed in a flat shape in different directions, the connecting member is hardly bent in any direction, and the strength can be improved. In addition, when one of the connection members (213f) inclines inward in the width direction of the traveling vehicle body as it goes upward, the worker can get on or off the connection member (213). The foot is not easily caught, and the getting on and off is improved.

It is a side view of the riding type rice transplanter with a fertilization apparatus of the Example of this invention. It is a top view of the riding type rice transplanter with a fertilization apparatus of FIG. It is principal part explanatory drawing of the flame | frame of the riding type rice transplanter 1 of an Example, and is the figure seen from upper direction. It is the drawing which illustrated only the main frame in FIG. It is the drawing which illustrated only a rotation frame in Drawing 3, Drawing 5A is a top view, and Drawing 5B is a side view. It is the figure which looked at the flame | frame of the riding type rice transplanter 1 of the Example from the side, and is explanatory drawing of the state which the rotation flame | frame moved to the normal position. It is explanatory drawing of the state which the rotation flame | frame 141 of Example 1 moved to the open position. It is explanatory drawing of the link member of Example 1, FIG. 8A is a perspective view of the state which the rotation flame | frame moved to the normal position, FIG. 8B is a perspective view of the state which the rotation flame | frame moved to the open position. It is explanatory drawing of the connection part of the rotation frame of Example 1, and a main frame, FIG. 9A is a perspective view, FIG. 9B is the IXB-IXB sectional view taken on the line of FIG. 9A. It is explanatory drawing of the connection part of the cover of Example 1, and a floor step. It is explanatory drawing of the connection part of the cover of a form different from FIG. 10, and a floor step. It is explanatory drawing of the connection part of the cover of a form different from FIG. 11, and a floor step. FIG. 13A is an explanatory view of a state in which the holding member is stored, and FIG. 13B is a holding member, and the pivoting frame is opened. It is explanatory drawing of the state hold | maintained at the position. It is explanatory drawing of the auxiliary | assistant step of the riding type rice transplanter of Example 1, FIG. 14A is a principal part top view, FIG. 14B is the figure seen from the front, FIG. 14C is a perspective view of an auxiliary | assistant step. It is explanatory drawing of the riding type rice transplanter which provided parasol stay, FIG. 15A is a side view, FIG. 15B is explanatory drawing of the connection part of parasol stay and a flame | frame.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.
In each of the drawings, members unnecessary for the description of the invention are appropriately omitted from the drawings and the description.
FIG. 1 and FIG. 2 show a riding type rice transplanter with a fertilization device equipped with a fertilization device which is an embodiment using the present invention. The seedling planting unit 4 is mounted on the rear side of the traveling vehicle body 2 via the elevating link device 3 so that the seedling planting unit 4 can be moved up and down. Is provided.
In the present specification, the left and right directions are referred to as left and right, respectively, and the forward direction is referred to as forward and the reverse direction is referred to as backward.

  The traveling vehicle body 2 is a four-wheel drive vehicle provided with a pair of left and right front wheels 10, 10 as a driving wheel and a pair of left and right rear wheels 11, 11. A transmission case 12 is disposed at the front of the vehicle body. Front left and right front wheels 13, 13 are provided on the left and right sides of the case 12, and left and right front wheels are protruded to the left and right front axles projecting outward from the respective front wheel support portions capable of changing steering directions of the left and right front wheels final cases 13, 13. 10, 10 are attached respectively. Further, the main frame 15 is fixedly supported by the transmission case 12, and the rear wheel gear cases 18, 18 can be rolled about a rear wheel rolling shaft provided horizontally at the rear center of the rear end of the main frame 15 as a fulcrum The rear wheels 11 and 11 are attached to rear wheel axles supported by the rear wheel shaft and protruding outward from the rear wheel gear cases 18 and 18, respectively.

  The engine 20 is mounted on the main frame 15, and the rotational power of the engine 20 is transmitted to the transmission case 12 via the first belt transmission 21 and the HST 23. The rotational power transmitted to the transmission case 12 is shifted by the transmission in the case 12 and then separated into the traveling power and the externally extracted power and taken out. A part of the traveling power is transmitted to the front wheel final cases 13 and 13 to drive the front wheels 10 and 10, and the remainder is transmitted to the rear wheel gear cases 18 and 18 to drive the rear wheels 11 and 11. The external extraction power is transmitted to the planting clutch case 25 provided at the rear of the traveling vehicle body 2 and then transmitted to the seedling planting unit 4 by the planting transmission shaft 26, and the fertilization device 5 by the fertilization transmission mechanism 27. It is transmitted to.

  The upper part of the engine 20 is covered with an engine cover (cover) 30, and a seat 31 is installed thereon. In front of the seat 31, there is a front cover 32 which incorporates various operating mechanisms, and above it, a steering wheel 34 for steering the front wheels 10, 10 is provided. The lower end left and right sides of the engine cover 30 and the front cover 32 form a horizontal floor step 35. The floor steps 35 are partially in the form of a grid (see FIG. 2), and the mud on the shoes of the workers who walk the step 35 is allowed to fall into the field. The rear part on the floor step 35 is a rear step 36 which doubles as a rear wheel fender.

In addition, on the front left and right sides of the traveling vehicle body 2, the spare seedling stand 38, 38 on which the seedlings for replenishment are placed can be pivoted to a position projecting laterally beyond the machine and a position stored inside. It is provided.
The lifting link device 3 has a parallel link configuration, and includes one upper link 40 and a pair of left and right lower links 41, 41. The links 40, 41, 41 are rotatably attached to a rear view gate base link base frame 42 whose base side is erected at the rear end of the main frame 15, and the vertical link 43 is connected to its tip end side. ing. A connecting shaft 44 rotatably supported by the seedling planting unit 4 is inserted and connected to the lower end of the vertical link 43, and the seedling planting unit 4 is connected so as to be able to roll around the connecting shaft 44. A lifting hydraulic cylinder 46 is provided between the support member fixed to the main frame 15 and the tip of the swing arm 45 integrally formed on the upper link 40, and the upper link 40 can be formed by hydraulically expanding and contracting the cylinder. The seedling planting unit 4 is moved up and down while keeping the posture substantially constant.

  The seedling planting unit 4 is an eight-row planting structure, with a transmission case 50 also serving as a frame, mat seedlings placed and reciprocated left and right to supply seedlings to each row of seedling outlet 51a, ... When all the seedlings are supplied to the seedling outlet 51a, ..., the seedling tank 51 transfers the seedlings downward by the seedling feeding belt 51b, ..., the seedlings supplied to the seedling outlet 51a, ... And a seedling planting device 52 for planting on the At the lower part of the seedling planting part 4, a center float 55 is provided in the center, and side floats 56, 56 are provided on the left and right sides thereof. When the machine is advanced with these floats 55, 56, 56 in contact with the mud surface of the field, the floats 55, 56, 56 slide while leveling the mud surface, and the planting plant 52, Seedlings are planted by .... Each float 55, 56, 56 is rotatably attached so that the front end side moves up and down according to the unevenness of the surface soil surface of the field, and vertical movement of the front part of the center float 55 is vertical movement detection mechanism during planting operation 57 is detected. At the lower part of the seedling planting unit 4, as one example of a leveling device, a leveling rotor 58 that is rotated and leveled is supported.

Fertilizer 5 dispenses granular fertilizer stored in fertilizer hopper 60 by a predetermined amount by feeders 61,..., And applies the fertilizer to both the left and right sides of floats 55, 56, 56 by fertilization hoses 62,. It guides to guides 63,... And is dropped into a fertilizing area formed in the vicinity of the side of the seedling attachment strip by grooved members 64,. The air generated by the blower 67 driven by the electric motor 66 is blown into the fertilization hoses 62,... Via the air chamber 68 long in the left-right direction, and the fertilizer in the fertilization hoses 62,. It is supposed to
Furthermore, on the left and right sides of the front portion of the traveling vehicle body 2, a pair of spare seedling placing stands 38, 38 for storing the seedlings for replenishment can be pivoted to a position where the gas projects forward and backward and a position aligned vertically. Provided in

FIG. 3 is an explanatory view of the main part of the frame of the riding type rice transplanter 1 of the embodiment, as viewed from above.
FIG. 4 is a view showing only the main frame in FIG.
In FIG. 3 and FIG. 4, in the riding type rice planter 1 of the first embodiment, the main frame 15 as an example of the frame has a pair of left and right columnar front and rear frames 110 extending in the front and rear direction (traveling direction). Connecting frames 111, 112, 113 extending in the left-right direction (the vehicle width direction) are supported at the front, the center in the front-rear direction, and the rear of the front and rear frames 110, respectively.
The front wheel final case 13 is supported by the front and rear frames 110 between the front connection frame 111 and the center connection frame 112, and the axles of the front wheels 10 extend outward in the left-right direction.

At the outer end of the central connection frame 112, a step support frame 116 extending in the front-rear direction is supported.
On the upper surface of the front and rear frames 110, a main step 121 as an example of a first step is supported. The main step 121 of the first embodiment has a front step 121a disposed at the front of the vehicle, a center step 121b disposed at the center, and a rear step 121c disposed at the rear. In the main step 121 of the first embodiment, the front step 121 a and the center step 121 b are fixedly supported by the main frame 15.

Side steps 122 as an example of a second step are disposed on the left and right sides of the main step 121.
The side step 122 of the first embodiment extends forward along the outer edge of the main step 121. Therefore, the side step 122 is formed in a trapezoidal shape whose top end is the front end in the forward direction when viewed from above. Thus, the gap between the outer edge of the main step 121 and the inner edge of the side step 122 is reduced.
The main step 121 and the side step 122 constitute a floor step 35 of the first embodiment.

Further, the side step 122 of the first embodiment is supported by the step support frame 116.
In addition, in the conventional rice transplanter, the side step was fixed to the attachment part fixed to the main frame. Therefore, when attaching or detaching the side step to the rice transplanter, the side step could not be attached or detached unless the main step was once removed. On the other hand, in the configuration of the first embodiment, the step support frame 116 is disposed outside the main step 121, and the side step 122 can be attached and removed without removing the main step 121. Therefore, when the rice transplanter 1 is transported by a transport vehicle or the like, the side step 122 can be easily attached and detached, and the operation efficiency at the time of transportation is improved.

In the first embodiment, the upper surface of the side step 122, the upper surface of the step support frame 116, and the upper surface of the center step 121b are supported so as to be flush with each other.
Here, in the conventional rice transplanter, the side step extends below the main step and extends outward in the vehicle width direction because the side step is fixed to the mounting portion of the main frame, and the main step and the side step There were gaps and gaps between the Therefore, there is a risk that the worker may crawl on the level difference or the tip of the shoe may be caught in the gap, causing the worker to be injured and injured.
On the other hand, in the first embodiment, the main step 121 and the side step 122 are flush with each other, and the level difference and the gap are reduced. Therefore, it is prevented that a worker is removed, an injury is prevented, and working efficiency is improved.

5 is a drawing showing only the pivot frame in FIG. 3, FIG. 5A is a plan view, and FIG. 5B is a side view.
FIG. 6 is a side view of the frame of the riding type rice transplanter 1 of the embodiment, and is an explanatory view of a state in which the pivoting frame is moved to the normal position.
3 to 6, the front and rear frames 110 according to the first embodiment have a front first upper frame 110a and a rear second lower frame 110b. The front end of the second frame 110b is connected to the center of the first frame 110a in the front-rear direction via a connecting member 110c.

A rear connection frame 113 is fixedly supported at the rear end of the second frame 110b.
In FIG. 6, a pair of front and rear rear frames 110 d is supported on the rear side of the connection frame 113 inside the second frame 110 b. In FIG. 15, the rear frame 110d is formed in a pillar shape extending obliquely upward and forward. A work implement support frame 131 supporting the seedling planting unit 4 as an example of a work implement is supported on the upper portion of each rear frame 110d. In FIG. 7, at the upper end of each rear frame 110d, a third frame 110e extending in the front-rear direction is supported. A front end portion of the pair of front and rear third frames 110 e is supported with a lateral frame 132 extending in the left-right direction. The lateral frame 132 and the rear end of the first frame 110a are connected by a reinforcing frame 110f as an example of a reinforcing member.

An extension support frame (frame) 130 is supported at a position corresponding to the front end of the engine cover 30 on the central connection frame 112 in the front-rear direction. A pair of left and right extension support frames 130 of the first embodiment is provided.
On the right side of the lateral frame 132, a link support frame 132a extending forward is supported. A pair of front and rear connecting frames 133 extending in the front and rear direction (traveling direction) is supported at the left and right ends of the horizontal frame 132. At the rear end of the front and rear connection frame 133, a rear end connection frame 134 extending in the left-right direction (vehicle width direction) is supported. A pair of left and right pivoting support frames 136 is supported by the rear end connection frame 134.
The main frame 15 of the first embodiment is configured by the members given the reference numerals 110 to 116 and 130 to 136.

A pivoting frame 141 is pivotably supported by a pivoting center 136 a of the rear end portion of the pivoting support frame 136. The pivoting frame 141 has a pair of left and right first pivoting portions 142. The first pivoting portion 142 is formed in a rectangular tube shape extending in the front-rear direction. The rear end portion of the first rotation portion 142 is rotatably supported at a rotation center 136a.
The first pivoting portions 142 are connected to each other by a second pivoting portion 143 extending in the left-right direction. The rear end of the first pivoting portion 142 and the inner side in the width direction of the second pivoting portion 143 are connected by the third pivoting portion 144. The third pivoting portion 144 has a horizontal plate portion 144a extending in the width direction and a vertical plate portion 144b bent forward from the inner end of the horizontal plate portion 144a.

  Connected to the second pivoting portion 143 is a fourth pivoting portion 146 which extends forward from the outside of the connecting portion of the vertical plate portion 144b. The fourth pivoting part 146 is provided as a left / right pair. The fourth pivoting part 146 is inclined obliquely upward as it goes forward. The front ends of the fourth pivoting portion 146 are connected by a fifth pivoting portion 147 extending in the left-right direction. The fifth pivoting portion 147 supports a pair of left and right sixth pivoting portions 148 extending forward from the inner side than the fourth pivoting portion 146. The front portions of the pair of sixth pivoting portions 148 are connected by a seventh pivoting portion 149 extending in the left-right direction.

A seat back support plate 151 is supported on the rear side of the seventh pivoting portion 149. At the front end of the sixth rotation portion 148, an eighth rotation portion 152 which inclines downward as going forward is integrally formed. The front end portion of the eighth pivoting portion 152 is connected by a ninth pivoting portion 153 extending in the front-rear direction. A plate-like sheet attachment portion 154 extending upward is supported by the ninth rotation portion 153. The seat attachment portion 154 of the first embodiment is provided as a pair of left and right. At the front end of the eighth pivoting portion 152, a tenth pivoting portion 155 extending downward is integrally formed. The lower end of the tenth pivoting portion 155 is disposed at a position corresponding to the extension support frame 130.
The pivoting frame 141 of the first embodiment is configured by the members denoted by reference numerals 142 to 154.

  In FIG. 3 and FIG. 6, the engine cover 30 is disposed so as to cover the upper surfaces of the fourth pivoting portion 146 to the tenth pivoting portion 155, and is fixed to the seat back support plate 151 by a screw 156. In addition, the rear step 121c is fixed to the pair of left and right first pivoting parts 142 at a total of four places by screws 157.

FIG. 7 is an explanatory view of a state in which the pivoting frame 141 of the first embodiment is moved to the open position.
Therefore, in the riding type rice planter 1 according to the first embodiment, the engine cover 30 and the rear step 121 c rotate with respect to the main frame 15 by the rotation frame 141 rotating around the rotation center 136 a. . Therefore, the pivoting frame 141, the engine cover 30, etc. can be moved between the normal position as an example of the second position shown in FIG. 6 and the open position as an example of the first position shown in FIG. is there. Therefore, in the open position, the engine 20 supported by the main frame 15 and the peripheral portion of the engine 20 are exposed to the outside. Therefore, compared with the conventional configuration in which only the upper side of the engine is opened and closed, the maintainability around the engine 20 is improved in the configuration of the first embodiment in which the rear step 121c also pivots.

In FIG. 6, in the riding type rice planter 1 according to the first embodiment, the front end of the seat 31 is rotatably supported at the upper end of the seat attaching portion 154 about the seat pivot center 158. At the rear end of the seat 31, a projecting portion 159 projecting downward is supported. When the operator can sit on the seat 31, the protrusion 159 is supported in contact with the upper surface of the seat back support plate 151. When the seat 31 is pivoted about the pivot center 158, the projection 159 is separated from the seat back support plate 151.
Therefore, in the first embodiment, the seat 31 is supported by the pivoting frame 141 via the seat attachment portion 154. Therefore, when the engine cover 30 or the like is opened, there is no need to remove the seat 31, and the workability is improved.

FIG. 8 is an explanatory view of a link member of Example 1, FIG. 8A is a perspective view of a state in which the pivoting frame is moved to the normal position, and FIG. 8B is a perspective view of the state in which the pivoting frame is moved to the open position. .
In FIGS. 3 to 8, a link member (fixing member) 171 is supported between the front end of the right first pivoting portion 142 and the link support frame 132a. The link member 171 has a first link 172 rotatably supported at one end by the link support frame 132a.

In FIG. 8A, the first link 172 has a pair of front and rear facing walls 172a, and a connecting wall 172b connecting the lower ends of the facing walls 172a. That is, the first link 172 is formed in a concave shape in cross section. One end of the first link 172 is rotatably supported by the link support frame 132a about the first link rotation center 172c. A stopper 172d is formed at the other end of the connection wall 172b.
One end of the second link 173 is supported at the other end of the first link 172. Similar to the first link 172, the second link 173 is formed in a concave shape in cross section having the facing wall 173a and the connecting wall 173b. One end of the second link 173 is rotatably supported by the first link 172 about a second link rotation center 173 c. The other end of the second link 173 is rotatably supported by the front end of the first pivoting portion 142 about the third link rotation center 173 d.
The first link 172 and the second link 173 constitute the link member of the first embodiment.

Therefore, the link member 171 of the first embodiment moves to the position shown in FIG. 6 and FIG. 8A when the pivoting frame 141 moves to the normal position. Then, when the pivoting frame 141 moves to the open position, the link member 171 moves to the position shown in FIGS. 7 and 8B. In the open position, the lower end portion of the connection wall 173b of the second link 173 contacts the stopper 172d of the first link 172.
In the first embodiment, in the open position, the second link rotation center 173c is located forward with respect to a line segment connecting the first link rotation center 172c and the third link rotation center 173d, At the position, the position of the stopper 172d is set such that the second link rotation center 173c is positioned rearward with respect to a line segment connecting the first link rotation center 172c and the third link rotation center 173d. . That is, the open position is interposed between the dead point of the link member 171 (the point at which the second link rotation center 173c exists on the line connecting the first link rotation center 172c and the third link rotation center 173d). And the normal position are set to the opposite side.

Therefore, in the first embodiment, when the pivoting frame 141 moves to the normal position, it moves to the normal position shown in FIGS. 6 and 8A, and the second link 173 is partially stored inside the first link 172. It will be Then, when the pivoting frame 141 moves to the open position, the link member 171 moves to the position shown in FIGS. 7 and 8B.
In the state shown in FIG. 8B, even if the third link rotation center 173d at the upper end of the link member 171 tries to move forward, the second link rotation center 173c exceeds the dead point, so the second link It stops in the state which the connection wall 173b of 173 contacted, and is hold | maintained at an open position. Therefore, even if the worker moves the hand from the pivot frame 141 in a state where the operator moves the pivot frame 141 to the open position and the link member 171 moves to the position shown in FIG. 8B, the pivot frame 141 etc. Even if the pivot frame 141 tries to return to the normal position by the force of gravity acting on it, it is held in the open position.

Therefore, in the riding type rice planter 1 of the first embodiment, when moving the pivoting frame 141 to the open position, the link member 171 is moved to the position shown in FIG. 8B (open holding position) by a simple one-touch operation. The pivoting frame 141 can be held in the open position. Therefore, with the engine cover 30 and the like held in the open position, the operator can safely perform the maintenance around the engine 20.
In the first embodiment, the rear step 121 c is fixed to the pivoting frame 141, and the front step 121 a and the center step 121 b are fixed to the main frame 15. Therefore, the operator can turn the turning frame 141 while riding on the center step 121b. Therefore, in the configuration in which the front step 121a and the center step 121b also rotate, it is necessary for the operator to work in the state of getting off the rice transplanter 1, but in the first embodiment, the work is possible without getting off Workability improves. Moreover, when working in a state of getting off the rice transplanter 1, when working on the upper part of the engine 20, work may be difficult depending on the height of the worker, but in the first embodiment, the center step 121b Work is possible from above, and the workability is improved.

  In addition, although the structure which forms the stopper 172c in the end of the plate-shaped connection wall 172b was illustrated in Example 1, it is not limited to this, It may be changed into arbitrary shapes, such as not a plate shape but rod shape. It is. Moreover, although the link member 171 was comprised by the two links 172 and 173, it is not limited to this, It is also possible to comprise the link member 171 by three or more links.

FIG. 9 is an explanatory view of a connection portion between the pivoting frame and the main frame of the first embodiment, FIG. 9A is a perspective view, and FIG. 9B is a cross-sectional view taken along line IXB-IXB of FIG.
In FIG. 6 and FIG. 9, when the pivoting frame 141 is moved to the normal position, the lower end of the tenth pivoting portion 155 is supported by the upper end of the extension support frame 130.

  In FIG. 9, a lower end of the tenth pivoting portion 155 is formed with a protrusion 181 projecting downward. Further, at the upper end of the extension support frame 130, an opening 182 as an example of a hole is formed corresponding to the protrusion 181. A cushion rubber 183, which is an example of a buffer member, is supported on the upper surface of the extension support frame 130. The cushion rubber 183 is formed with a rubber opening 183 a as an example of a hole corresponding to the opening 182. Therefore, when the pivoting frame 141 moves to the normal position, the lower end of the tenth pivoting portion 155 is supported by the extension support frame 130 in a state where the protrusions 181 are inserted into the openings 182 and 183a.

  Therefore, in the riding type rice planter 1 of the first embodiment, when the pivoting frame 141 is returned to the normal position, the protrusion 181 is inserted into the openings 182 and 183a, and the engine cover 30 and the like are closed. can do. Therefore, at the time of closing, as compared with the configuration in which the engine cover 30 is fixed by a bolt, a screw or the like, the work is simplified and the workability is improved.

  In FIG. 9B, in the first embodiment, the positions of the openings 182 and 183 a are set to partially overlap the position of the protrusion 181. Specifically, in the front and rear direction and the left and right direction, the position of the center of the protrusion 181 and the position of the center of the openings 182 and 183a are set to be shifted. Therefore, as shown in FIG. 9B, the outer surface of the protrusion 181 is set to be in contact with the inner surface of the openings 182 and 183a when the pivoting frame 141 is moved to the normal position. Therefore, when the pivoting frame 141 moves between the normal position and the open position, the outer surface of the protrusion 181 and the inner surface of the openings 182 and 183a are set to rub. Therefore, in the passenger type rice transplanter 1 of the first embodiment, friction is set to occur between the outer surface of the protrusion 181 and the openings 182 and 183a at the normal position.

  Therefore, for example, when the riding type rice transplanter 1 is mounted on a truck or the like and transported, or when the pivoting frame 141 tries to move from the normal position due to vibration such as transportation during traveling, the outer surface of the protrusion 181 and the opening 182 , And 183a, it is difficult for the pivoting frame 141 to move from the normal position. That is, the ability to hold the pivot frame 141 in the normal position is improved as compared to the case where the center position of the protrusion 181 and the center position of the openings 182 and 183a coincide with each other. Therefore, during transportation or traveling, the engine cover 30 and the rear step 121c are prevented from being opened, and the safety is improved. In addition, the seat 31 jumping up or rattling while traveling is also reduced. In particular, in the first embodiment, the projections 181 are in contact with the inner surface of the cushion rubber 183 having a large frictional resistance, and the effect of reducing rattling is improved.

In addition, in Example 1, although the structure which shifts the position of the projection part 181 and opening 182,183a in the front-back direction and the left-right direction was illustrated, it is not limited to this. For example, it is possible to shift only in the front and rear direction, and to make the left and right directions coincide with each other in the center position, or to shift only in the left and right direction and match the front and back directions. Alternatively, the opening 182 of the extension support frame 130 may be aligned with the projection 181, and only the opening 183a of the cushion rubber 183 may be offset from the projection 181.
Moreover, in Example 1, although the structure which formed the projection part 181 in the rotation flame | frame 141 and formed the opening 182, 183a in the extension support frame 130 side was illustrated, it is not limited to this. For example, it is possible to form an opening in the pivoting frame 141 and to form a protrusion on the extension support frame 130.

FIG. 10 is an explanatory view of a connecting portion between the cover and the floor step of the first embodiment.
In FIG. 10, in the riding type rice planter 1 of the first embodiment, the center step 121b is formed with a cylindrical tubular portion 190 extending upward so as to surround the outside of the engine 20. In the normal position, at the front end portion of the engine cover 30, a lower end 191 as an example of the contact portion is configured to cover the upper end 192 of the cylindrical portion 190 in the forward direction. In the embodiment shown in FIG. 10, the lower end 191 of the engine cover 30 has a first cover sloped surface 191a inclined in the direction of gravity from the lower end, a cover horizontal surface 191b extending rearward from the upper end of the first cover sloped surface 191a, and a cover And a second cover sloped surface 191c that inclines upward from the rear end of the horizontal surface 191b. That is, in the form shown in FIG. 10, the lower end 191 is formed in a step-like shape.
Further, in the cylindrical portion 190, the upper end 192 as an example of the receiving portion corresponds to the respective surfaces 191a to 191c of the lower end 191 of the engine cover 30, and the first step slope surface 192a, the step horizontal surface 192b, and the second step It has a slope surface 192c.

Therefore, in the riding type rice transplanter 1 shown in FIG. 10, the surfaces 191a to 191c and 192a to 192c are in contact with each other when the turning frame 141 moves to the normal position. Therefore, the step-like portions are in contact with each other so as to be engaged with each other, and the fitting accuracy between the engine cover 30 and the cylindrical portion 190 of the center step 121b can be improved. In addition, it is possible to suppress the generation of rattling and abnormal noise between the engine cover 30 and the center step 121b during traveling or transportation.
Further, in the configuration shown in FIG. 10, the lower end 191 of the engine cover 30 is disposed so as to cover the upper end 192 of the cylindrical portion 190 at the normal position. In the case where the lower end 191 and the upper end 192 have the opposite relationship, when the mud enters the connection portion, the mud is likely to enter the inside of the engine cover 30 when the pivot frame 141 is opened. On the other hand, in the form shown in FIG. 10, the approach of mud etc. to the inside of the engine cover 30 is reduced.

FIG. 11 is an explanatory view of a connecting portion between the cover and the floor step in a mode different from that of FIG.
In FIG. 11, in another mode of the first embodiment, the lower end 191 'of the front end of the engine cover 30 is configured to cover the upper end 192' of the center step 121b in the normal position. In the embodiment shown in FIG. 11, the inclination angle of the upper end 192 'of the center step 121b is set closer to the gravity direction with respect to the inclination angle of the lower end 191' of the engine cover 30 with respect to the gravity direction. Therefore, in the mode shown in FIG. 11, the inner surface of the engine cover 30 is in contact (strictly, line contact along the width direction) at one point of the upper end 192 'of the center step 121b.

Therefore, in the mode shown in FIG. 11, the load on the upper end 192 'of the center step 121b is in a state where the pivot frame 141 has moved to the normal position as compared with the case where the engine cover 30 and the center step 121b contact in a wide surface. Are easy to concentrate. Therefore, the frictional resistance between the engine cover 30 and the center step 121b tends to be large. Therefore, when the riding type rice planter 1 is transported or the like, the pivoting frame 141 is easily rotated, rattling, or the seat 31 is repelled.
In particular, in the configuration shown in FIG. 11, when the pivoting frame 141 pivots to the open position, the inner surface of the engine cover 30 is easily moved so that the upper end 192 'rubs. That is, resistance easily occurs in the rotational direction. Therefore, abnormal noise due to rattling and sheet jumping can be effectively suppressed.

FIG. 12 is an explanatory view of a connecting portion between the cover and the floor step in a mode different from that of FIG.
In FIG. 12, in another mode of the embodiment 1, contrary to FIG. 11, the inclination angle of the upper end 192 ′ ′ of the center step 121b is smaller than the inclination angle of the lower end 191 ′ ′ of the engine cover 30 with respect to the gravity direction. The angle is set close to the horizontal direction. Therefore, in the mode shown in FIG. 12, the lower end 191 ′ ′ of the engine cover 30 contacts with the surface of the upper end 192 ′ ′ of the center step 121b at one point (strictly speaking, line contact along the width direction) There is.

  Therefore, in the embodiment shown in FIG. 12, as in the embodiment shown in FIG. 11, the pivot frame 141 is moved to the normal position as compared with the case where the engine cover 30 and the center step 121b contact in a wide surface. The load tends to concentrate on the upper end 192 'of the center step 121b. Therefore, the frictional resistance between the engine cover 30 and the center step 121b tends to be large. Therefore, when the riding type rice planter 1 is transported or the like, the pivoting frame 141 is easily rotated, rattling, or the seat 31 is repelled.

FIG. 13 is an explanatory view of a configuration for holding the pivoting frame in a form different from that of the first embodiment in the open position, FIG. 13A is an explanatory view of a state in which the holding member is stored, and FIG. It is explanatory drawing of the state by which the flame | frame was hold | maintained at the open position.
In the embodiment shown in FIG. 13, a groove 202 for housing the crank rod 201 as an example of the holding member is formed on the upper surface of the center step 121b. The crank rod 201 is configured by a feed amount adjustment tool of the fertilization device 5. In addition, since the delivery amount adjustment tool of the fertilization apparatus 5 is described in Unexamined-Japanese-Patent No. 2015-100349 etc., for example, since it is conventionally well-known, detailed description is abbreviate | omitted.
In the embodiment shown in FIG. 13, the groove 202 is formed with a hole 202 a into which the end of the crank rod 201 is inserted. Moreover, in the form shown in FIG. 13, the link member 171 is not provided.

Therefore, in the mode shown in FIG. 13, when the operator holds the engine in the open position for maintenance around the engine, the crank rod 201 can be used from the groove 202. That is, as shown in FIG. 13B, one end of the crank rod 201 is inserted into the hole 202a, and the other end is abutted against the inner surface of the engine cover 30 to hold the engine cover 30 and the pivot frame 141 in the open position. It is possible.
In particular, in the embodiment shown in FIG. 13, the crank rod 201 is accommodated in front of the seat 31, so the crank rod 201 can be easily visually observed. Further, the crank rod 201 is shared with the feeding amount adjustment tool of the fertilizing device 5, so that the number of parts does not increase, and the cost increase can be suppressed. Furthermore, when it is going to store a rod inside the engine cover 30, although it is necessary to set it as a high cost telescopic rod, the raise of cost can be suppressed. In addition, since one end of the crank rod 201 is inserted into the hole 202a, the crank rod 201 slides in the groove 202 and the engine cover 30 is closed during work in a state where the engine cover 30 is opened. Situation is prevented and safety is improved.

  In addition, in the form shown in FIG. 13, although it is desirable to share the crank rod 201 with the feeding amount adjustment tool of the fertilizer application device 5, it is not limited to this. For example, it is also possible to provide a holding member separately from the feeding amount adjustment tool of the fertilization device 5. In this case, the shape of the crank rod 201 is not limited to the crank shape, and may be a linear bar or any shape.

FIG. 14 is an explanatory view of the auxiliary step of the riding type rice transplanter of Example 1, FIG. 14A is a plan view of the main part, FIG. 14B is a view from the front, and FIG. 14C is a perspective view of the auxiliary step.
In FIG. 14, illustrations and descriptions other than the members necessary for the description of the auxiliary steps are appropriately omitted.
In FIG. 14, in the passenger type rice transplanter 1 of the first embodiment, an auxiliary step 211 is supported at the outer end of the side step 122. The auxiliary step 211 can be used as a scaffold when the worker appears in the riding type rice transplanter 1. The auxiliary step 211 shown in FIG. 14 has a step body 212 as an example of the step unit. The step body 212 is formed in a plate shape that allows the operator to carry his / her foot. The step body 212 is fixed to the side step 122 by a support pipe 213 as an example of a connecting member.

In FIGS. 14B and 14C, the support pipe 213 has a horizontal portion 213a welded to the step body 212 and extending in the front-rear direction. A rear support portion 213b extending upward is integrally formed at the rear end of the horizontal portion 213a. The rear support portion 213b is formed of a cylindrical pipe, and the upper end 213c is formed in an oval shape (flat shape) obtained by deforming the cylinder into an elongated shape in the front-rear direction.
In addition, a front support portion 213d which is inclined obliquely inward and obliquely upward in the width direction is integrally formed at the front end of the horizontal portion 213a. At the upper end of the front support portion 213d, a front upper end support portion 213e extending upward in the direction of gravity is integrally formed. The lower portion of the front support portion 213d and the front upper end support portion 213e is formed of a cylindrical pipe, and the upper portion 213f of the front upper end support portion 213e is an oval (flat) shape in which the cylinder is elongated in the lateral direction. Shape). An upper end 213c of the rear support portion 213b and an upper portion 213f of the front upper end support portion 213e are welded to the side step 122.

Therefore, in the passenger type rice transplanter 1 of the first embodiment, the support pipe 213 of the auxiliary step 211 is formed in an asymmetrical shape between the front side and the rear side. The front side of the support pipe 213 is inclined inward as the front support portion 213d goes upward. Therefore, when putting the foot on the auxiliary step 211 from the front side of the riding type rice transplanter 1, the foot is less likely to be caught on the support pipe 213, and it is easy to get on and off.
Further, in the first embodiment, the direction in which the cylinder is deformed is different between the front upper end 213c and the front upper end 213f. Therefore, even if the auxiliary step 211 receives a force in the front-rear direction, the rear upper end 213c elongated in the front-rear direction can easily bear, and even if it receives a force in the vehicle width direction, the upper end 213f elongated in the lateral direction can easily bear. Therefore, as a whole, the support pipe 213 is difficult to bend in any direction, and the strength is improved.

  It is also conceivable that the rear support portion 213b has a shape similar to that of the front support portion 213d, that is, a front and rear symmetrical shape so that the passenger type rice transplanter 1 can easily get on and off from either the front or rear. In this case, when the worker places his / her foot on the auxiliary step 211, a force is easily applied in the direction of rotating downward with the upper ends of the support portions 213b and 213d as a fulcrum, and deformation easily occurs. Therefore, it is necessary to increase the fixing strength of the welded portion between the support pipe 213 and the side step 211, which may increase the cost. On the other hand, in the first embodiment, the front and rear sides are asymmetrical, and when the operator gets on the auxiliary step 211, a force acts to twist the support pipe 213. Therefore, the weight of the worker is not only received by the welding portion, but is also received by the support pipe 213, and it is expected to endure even if the fixing strength is not so high.

  In the first embodiment, the upper end 213c on the rear side is elongated in the front-rear direction and the upper end 213f on the front side is elongated in the left-right direction.

FIG. 15 is an explanatory view of a riding type rice transplanter provided with a parasol stay, FIG. 15A is a side view, and FIG. 15B is an explanatory view of a connection portion between the parasol stay and the frame.
In addition, illustration and description of members other than a member required for description of auxiliary | assistant step are suitably abbreviate | omitted in FIG.
In the mode shown in FIG. 15, the parasol stay 221 is supported by the riding type rice planter 1. The parasol stay 221 is for supporting a parasol (umbrella) for providing a shade to the worker of the seat 31 when the sunlight is strong or the like. The parasol stay 221 is formed of a hollow cylindrical member so that the handle of the parasol can be inserted.

In FIG. 15B, a plate-like lower end plate 222 is integrally supported at the lower end of the parasol stay 221 by welding or the like. The lower end plate 222 is fixedly supported by the umbrella frame 223. The umbrella frame 223 is fixedly supported by the rear frame 110d.
The umbrella stay 221 has a lower portion 221a extending in the direction of gravity. The lower portion 221a passes through an opening 224 formed in the rear step 121c. At the upper end of the lower portion 221a, a sloped portion 221b extending obliquely upward and frontward is integrally formed. An upper portion 221c extending upward is integrally formed at the upper end of the inclined portion 221b.

Therefore, in the mode shown in FIG. 15, it is possible to attach a parasol to the parasol stay 221 to make a shade for the worker. In particular, in the mode shown in FIG. 15, the parasol stay 221 has the sloped portion 221b, and the parasol can be installed at a position closer to the worker than in the case where the sloped portion is not included. Therefore, even if the direction of the rice transplanter 1 changes, it is easy to provide shade to the worker.
Further, in the first embodiment, the parasol stay 221 is fixed to the rear frame 110d, and the fixing strength can be easily improved as compared with the case of fixing to the resin rear step 121c.

  In the embodiment shown in FIG. 15, the parasol stay 221 is fixed to the rear frame 110d of the main frame 15. However, the present invention is not limited thereto, and may be fixed to the pivot frame 141 or the rear step 121c. It is possible. If the rear step 121c is to be removed from the pivoting frame 141 if the rear step 121c is fixed to the rear step 121c, it is necessary to remove the rear step 121c from the pivoting frame 141 after removing the parasol stay 221 from the rear step 121c. It will be On the other hand, when the parasol stay 221 is fixed to the pivoting frame 141, the workability of removing the rear step 121c from the pivoting frame 141 is improved, and the fixing strength is also enhanced.

2 Vehicle body 30 Engine cover (cover)
31 seat 35 floor step 121a front step 121b center step 121c rear step 130 extension support frame 141 rotation frame 171 link member (fixing means)
181 projection 182 opening (hole)

Claims (4)

In a working vehicle provided with a seat (31) on which a worker can sit on a traveling vehicle body (2),
The traveling vehicle body (2) is provided with a pivoting frame (141), a cover (30) covering a part or all of the pivoting frame (141) is provided, and the seat (31) is mounted on the cover (30). Set up
The pivoting frame (141), the seat (31) and the cover (30) are integrally pivotable, and fixed at an open position where the pivoting frame (141) is pivoted upward by a predetermined amount. Provide means (171) ,
A projection (181) is provided for fixing the pivoting frame (141) at a normal position where an operator is seated on the seat (31) and can be operated.
The frame (130) of the traveling car body (2) is provided with a hole (182) in which the projection (181) fits when the pivoting frame (141) is turned downward to the traveling car body (2) side ,
The seat (31) is supported by the pivoting frame (141) via a seat attachment portion (154),
The fixing means (171) includes a first link (172) and a second link (173).
The first link (172) has a pair of front and rear opposing walls (172a), and a connecting wall (172b) connecting lower ends of the opposing walls (172a),
The first link (172) is supported by the link support frame (132a) of the main frame (15) of the traveling vehicle body (2) with the first link rotation center (172c) as a center.
An auxiliary step (211) is provided which can be used as a footing when the operator gets on / off,
The support pipe (213) fixed to the side step (122) has a horizontal portion (213a) welded to the step body (212) of the auxiliary step (211) and extending in the longitudinal direction,
A front support (213d) and a rear support (213b) extending upward are integrally formed before and after the horizontal part (213a),
The front support portion (213d) and the rear support portion (213b) are formed of cylindrical pipes,
An upper end (213f) of the front support portion (213d) and an upper end (213c) of the rear support portion (213b) are formed into a flat shape in which a cylinder is deformed into an elongated shape,
An upper end (213f) of the front support portion (213d) and an upper end (213c) of the rear support portion (213b) are formed in an asymmetrical shape,
The front side of the support pipe (213) is inclined inward as the front support (213d) goes upward,
A work vehicle characterized by   A cushion rubber (183) is disposed outside the hole (182),
  The work vehicle according to claim 1, characterized in that the projection (181) allows passage of the rubber opening (183a) of the cushion rubber (183).   An upwardly extending cylindrical portion (190) is provided to surround the outside of the engine (20),
  The lower end (191) of the cover (30) is configured to cover the upper end (192) of the cylindrical portion (190),
  The lower end (191) of the cover (30) is formed in a step shape,
  The upper end (192) of the cylindrical portion (190) is formed in a step shape corresponding to the lower end (191) of the cover (30),
  The work vehicle according to claim 1 or 2, characterized in that: Providing a floor step (35) covering the upper part of the traveling vehicle body (2);
The floor step (35) includes a rear step (121c) disposed rearward with respect to the traveling direction of the traveling vehicle body (2) and a center step (121b) disposed forward of the rear step (121c). , And a front step (121a) disposed in front of the center step (121b),
The work according to any one of claims 1 to 3, wherein the rear step (121c) is mounted on the pivoting frame (141) so as to pivot integrally with the cover (30). vehicle.

Images