JP2006325483A - Riding type rice transplanter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a riding type rice transplanter which has high flexural rigidity, although having a lightweight and compact constitution, and can easily be assembled. <P>SOLUTION: Since a running frame 3 for connecting a mission case 2 to a rear axle case 5 has a downward opened U-shape cross-section, soil pushing forces can be reduced to decrease running resistance in comparison with a case having a closed cross sectional shape having a lower side plate, such as an angular cylinder shape, when the riding type rice transplanter runs on a field having a mud depth. Furthermore, since the running frame 3 has the downward opened U-shape cross-section, the flexural rigidity can be enhanced. Bolts 53 for connecting the mission case 2 to the running frame 3 can be attached or detached from both the right and left sides of a running machine frame, while bolts 55, 57 for connecting the running frame 3 to the rear axle case 5 can be attached or detached from the upper side of the running machine frame. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lightweight and compact configuration of a riding type rice transplanter.

  Conventionally, the configuration of a passenger-type rice transplanter is well known. For example, in Patent Document 1, a pair of left and right mainframes in the front-rear direction and a front portion of both mainframes are connected in a plan view of the body. A rectangular frame is formed by a front frame and a rod-shaped connecting frame that connects both main frames between the rear side of the front frame, and on the support member that connects the front frame and the connecting frame back and forth within the rectangular frame. It is known that an engine is mounted and a longitudinal and longitudinal mission case is disposed between the front portions of both main frames behind the engine. In this mission case, there is a built-in type in which a traveling transmission system with a transmission mechanism for transmitting the power from the engine to the front wheels and the rear wheels and a power transmission mechanism for the PTO shaft are incorporated. A front wheel drive shaft and a rear wheel drive shaft protrude from the left and right sides of the case.

On the other hand, in Patent Document 2, a pair of front and rear longitudinal main frames that connect a transmission case disposed at the front of the traveling vehicle body and a rear axle case disposed at the rear of the traveling vehicle body, and the pair of left and right main frames. This is a sub-frame that connects the front and rear end portions and the midway portion in the lateral direction to form a frame in a plan view (ladder shape), and the cross section of the main frame is formed in a rectangular cylindrical shape. Below the traveling frame, a traveling drive extending from the rear portion of the transmission case toward the front portion of the rear axle case and a planting output shaft (PTO shaft) are in the vertical position, and the left and right center lines of the traveling aircraft body Were arranged to match.
Japanese Patent Laid-Open No. 11-318131 (see FIGS. 3 and 21) JP 2000-326834 A (see FIGS. 3, 9 and 11)

  However, according to the configurations of Patent Documents 1 and 2, as a result of the traveling machine body being configured with a ladder-like frame, the required number of structural members of the traveling machine body is increased, and the number of structural members for the transmission case and the rear axle case is increased. Since there are many steps to assemble, there is a problem that the manufacturing cost increases.

  In addition, as a result of the traveling machine body being configured with a ladder-like frame in plan view, there is a problem that although the height in the side view is small, the lateral width becomes large, and furthermore, because it is in a plan view ladder shape, There was a problem that the mud that jumped up during traveling easily piled up on the upper surface of the frame.

  The present invention has been made to solve the above-described conventional problems, and an object thereof is to provide a riding-type rice transplanter that is lightweight and compact in configuration, easy to assemble, and can reduce manufacturing costs. It is.

  In order to achieve the above object, a riding type rice transplanter according to the invention described in claim 1 is a riding type rice transplanter in which a power unit is arranged at a front part of a traveling machine body and a seedling planting device is connected to a rear part of the traveling machine body so as to be movable up and down. The traveling machine body is configured by connecting a transmission case that fixes the engine to the upper surface and to which a front axle case is attached, and a rear axle case with a longitudinal traveling frame, and the traveling frame has an open cross section. It is formed in a downward U-shape.

  According to a second aspect of the present invention, in the riding type rice transplanter according to the first aspect, the connection bolt between the transmission case and the traveling frame is configured to be detachable from both left and right side surfaces of the traveling body, The connecting bolt with the rear axle case is configured to be detachable from the upper surface side of the traveling machine body.

  According to a third aspect of the present invention, in the riding type rice transplanter according to the first or second aspect, a power transmission mechanism to a traveling drive system and a PTO drive system is built in the rear side of the transmission case, and the traveling frame Inside, either one of the travel drive system or the PTO drive system is disposed, and the other transmission member is disposed along one outer side of the travel frame.

  According to a fourth aspect of the present invention, in the riding type rice transplanter according to the first or second aspect, a power transmission mechanism for a travel drive system and a PTO drive system is built in the rear side of the mission case, and the travel frame Inside, the transmission members of both the travel drive system and the PTO drive system are arranged.

  According to the first aspect of the present invention, the front and rear longitudinal traveling frames that connect the transmission case and the rear axle case are U-shaped with the cross section opened downward, so that the cross section has a bottom plate having a rectangular tube shape or the like. Compared with the shape, when the riding type rice transplanter travels in a deep mud field, mud pushing can be reduced and travel resistance can be reduced even when the travel frame is in the mud. In addition, since the traveling frame is a U-shaped with the cross section opened downward, the bending rigidity against the reaction force of the traveling vehicle body between the front and rear axles received from the front wheels and the rear wheels can be increased while having a lightweight and compact configuration. There is an effect.

  According to the second aspect of the present invention, the connecting bolt between the transmission case and the traveling frame is configured to be detachable from both the left and right side surfaces of the traveling vehicle body, while the connecting bolt between the traveling frame and the rear axle case is configured as the traveling vehicle body. Because it is configured to be detachable from the upper surface side, the connection bolt when assembling the main frame of the traveling aircraft, regardless of the processing accuracy of each component when the transmission case, traveling frame and rear axle case are each formed separately This makes it possible to adjust the position at the point, and facilitates assembly work.

  According to the third aspect of the present invention, the power transmission mechanism to the travel drive system and the PTO drive system is built in the rear side of the transmission case, and the travel drive system is provided in the travel frame (inside of the downward opening). Alternatively, if the PTO shaft or transmission shaft or chain transmission mechanism, which is one of the transmission members of the PTO drive system, is arranged and the other transmission member is arranged along the outer side of one side of the traveling frame, the inner side of the traveling frame It is possible to protect the upper side and the left and right sides of the transmission member disposed on the side.

  According to the fourth aspect of the present invention, if transmission members (PTO shaft or transmission shaft or chain transmission mechanism) of both the traveling drive system and the PTO drive system are arranged, all these transmission members are protected by the traveling frame. can do.

  Next, preferred embodiments of the present invention will be described with reference to the drawings. 1 is a side view of a riding type rice transplanter, FIG. 2 is a plan view, FIG. 3 is a perspective view of a traveling machine body of the first embodiment, and FIG. 4 is a perspective view showing a connection state of a transmission case, a traveling frame, and a rear axle case. 5 is a plan view of FIG. 4, FIG. 6 is a side view showing an assembly portion of the engine with respect to the mission case, FIGS. 7 to 10 are diagrams showing the mission case of the first embodiment, and FIGS. 11 to 15 are mission cases. FIG. 16 to FIG. 18 are views showing a connection state between the transmission case, the travel frame, and the rear axle case according to the second embodiment.

  As shown in FIGS. 1 to 5, the traveling machine body in the four-row planted type rice transplanter of the present embodiment includes a main frame 1 a and a subframe 1 b. The main frame 1a is configured by connecting a transmission case 2 to which an engine 21 is fixed on the upper surface and a front axle case 4 is mounted on both right and left sides, and a rear axle case 5 by a metal traveling frame 3 having a longitudinal longitudinal direction. (See FIG. 4 and FIG. 5). The sub-frame 1b has a configuration in which rectangular or round-shaped frame members are arranged and connected to the left and right sides of the main frame 1a (see FIGS. 2 and 3).

  A transmission case 2 made of an aluminum alloy or the like and having an integrated case body that is long in the front-rear direction is formed by integrating a divided case divided into the left and right sides of the traveling machine body by bolting the housing of the internal mechanism. A front axle case 4 protrudes from the left and right side surfaces of the middle part of the transmission case 2 in the front-rear direction, and a rear axle case 5 is attached to the rear end of the traveling frame 3. A front wheel 4a is attached to the left and right ends of the front axle case 4, and a rear wheel 5a is attached to the left and right ends of the rear axle case 5, respectively (see FIGS. 1 and 2). The cross section of the traveling frame 3 is formed in an open downward U-shape.

  A seedling planting device 7 is connected to the rear end of the main frame 1a through a parallel link mechanism 6 composed of upper and lower links so as to be moved up and down. The seedling planting device 7 has a conventionally known structure, that is, a pair of left and right planting transmission cases 11 to which power is transmitted via a universal joint shaft 10 from a PTO shaft 9 projecting rearward from the mission case 2 and an upper end thereof. A seedling platform 12 that is inclined forward so as to approach the rear part of the traveling machine body, a float 13 that is disposed on the lower surface of each planting transmission case 11, and a left and right side of each planting transmission case 11, It consists of a planting mechanism 14 with planting claws that divides and plants one by one from the seedling mat on the seedling platform 12 while moving up and down between the lower ends of the seedling platform 12. And the raising / lowering hydraulic cylinder 15 provided in the rear end of the main frame 1a is attached in connection with the parallel link mechanism 6, and can raise / lower the seedling planting apparatus 7 largely.

  Further, a synthetic resin body cover 16 arranged so as to cover the main frame 1a and the subframe 1b from above is mainly attached to the subframe 1b. On the subframe 1b, a seat body 17 is mounted on a seat support shaft standing from the subframe 1b so as to be horizontally rotatable. In front of it, a front bonnet (engine hood) 19 is fixed and erected on the upper surface of the vehicle body cover 16. Inside the front bonnet 19 are disposed a steering lower shaft 20, an engine 21, a fuel tank 22, and the like that are erected from the front end side of the upper surface of the mission case 2 described later. A steering upper shaft 23 is connected to the steering lower shaft 20 via a universal joint 27, and the steering upper shaft 23 having a round handle 24 attached to the upper end can be bent in the front-rear direction of the traveling body (tilt). Possible). A tilt mechanism 47 and its upper portion are provided between an upper end of a lower column 45 standing on the front portion of the upper surface of the transmission case 2 and surrounding the outer periphery of the steering lower shaft 20 and an upper column 46 surrounding the outer periphery of the steering upper shaft 23. Posture holding means 48 is provided for holding the inclination angle in a plurality of stages (see FIGS. 3 to 6).

  Further, the central portion of the front bonnet 19 on the left and right sides of the front bonnet 19 is a substantially U-shaped space in a plan view formed in a notch from the upper surface side to the front end, and this space moves back and forth integrally with the steering upper shaft 23. A movable cover body 25 and an auxiliary cover body 26 connected to the movable cover body 25 so as to be rotatable upward are covered.

  The transmission case 2 includes a steering drive mechanism 28 for steering in its front part, and a traveling drive system 29 and a power transmission mechanism 31 to the PTO drive system 30 in its middle part to the rear part. (See FIGS. 7 to 10). The mission case 2 has a step 2a in the middle so that the height of the front part on the upper surface side is low and the height is higher from the middle part to the rear part in a side view (FIGS. 7 and 9). reference). On the stepped portion 2a, a foot portion of a flat engine support member 32 straddling right and left on the upper surface of the mission case 2 is fixed with bolts (see FIG. 6). A base portion (crankcase portion) 21a of the engine 21 is fixed to the engine support member 32, and the piston cylinder case 21b side of the engine 21 is inclined so as to face upward. The engine 21 may be fixed upright. Pulleys 33a, 34a, belts, which are conventionally known belt transmission mechanisms with a tension type main clutch mechanism 35a, are provided on the output shaft 33 of the engine 21 and the input shaft 34 projecting to one side surface in the longitudinal direction of the transmission case 2. Power is transmitted by providing 35, and power is transmitted from the input shaft 34 to the power transmission mechanism 31 in the mission case 2.

  The power transmission mechanism 31 includes a gear-type transmission mechanism 38 that changes the rotational speed from the input shaft 34. Power is transmitted from the gear-type transmission mechanism 38 to the front axle shaft 39 with the differential mechanism 39a through the transmission shaft 37 having the traveling brake 37a, while the power is transmitted to the output shaft 40 to the rear wheel through the bevel gear 37b. (FIG. 8). Therefore, when the traveling brake 37a is operated, the front wheel 4a and the rear wheel 5a are braked. The base portion of the horizontally long cylindrical portion 4b of the front axle case 4 is bolted to the side surface of the transmission case 2, and power is transmitted from the front axle shaft 39 disposed in the horizontally long cylindrical portion 4b to the axle of the front wheel 4a. On the other hand, the output shaft 40 protrudes rearward from the right side surface of the transmission case 2, and is transmitted from the output shaft 40 to the transmission shaft 41 via a universal joint, and is transmitted to the rear axle 5 as a traveling drive system to the rear wheels. (See FIG. 5, FIG. 7, FIG. 8, FIG. 10, FIG. 13 and FIG. 14).

  On the other hand, a PTO shaft 9 that protrudes rearward from the rear end of the transmission case 2 via the PTO clutch 42 from the gear-type transmission mechanism 38 is provided (see FIGS. 8 to 11).

  The traveling frame 3 is a U-shaped cross-section with the side plate 3b bent downward from both the left and right sides of the upper surface plate 3a, and has a fin piece 3c facing outward from the lower edge of the side plate 3b (FIGS. 4, 11 to 13). reference). The front portion of the traveling frame 3 is covered from the outside to the rear side of the left and right side surfaces of the mission case 2, and both side plates 3 b of the traveling frame 3 are horizontally connected from the left and right outer sides by the connecting bolts 53. It is fastened and connected to the side surface (see FIGS. 1, 3 to 5, and FIGS. 11 to 14). Further, the rear side of the upper surface plate 3a of the traveling frame 3 is fastened and connected by a connecting bolt 55 to a pair of bracket portions 54 protruding upward from the upper portion of the central case portion 5b in the rear axle case 5 (FIG. 11, (See FIGS. 12 and 15). Further, the fin pieces 3c on the left and right sides of the traveling frame 3 are fastened and connected by a connecting bolt 57 to a pair of bracket portions 56 protruding forward from the front portion of the central case portion 5b (see FIGS. 11 and 12). ).

  The PTO shaft 9 is disposed inside the traveling frame 3 described above, and is pivotally supported by a bearing portion 58 attached to the rear end of the traveling frame 3 and above the central case portion 5b (see FIGS. 11 and 15). ). The transmission shaft 41 extends along the outside of the right side surface of the traveling frame 3 and is connected to the shaft on the front surface of the central case portion 5 b of the rear axle 5.

  A steering link mechanism 44 such as a pitman arm 44a, a connecting rod, and a tie rod for changing the steering direction of the left and right front wheels 4a is disposed below the steering drive mechanism 28 at the front of the mission case 2 (see FIGS. 3 and 4). .

  In addition, on one side of the upper column 46 (on the left side of the machine body in the embodiment), the main clutch lever 49 and the gear-type transmission mechanism 38 of the transmission case 2 are switched to a forward two-stage, a neutral stage and a reverse one-stage. The main transmission lever 50 is disposed, and on the other side of the upper column 46 (right side of the machine body in the embodiment), an elevating operation lever 51 for driving the hydraulic cylinder 15 for elevating the seedling planting device 7 is disposed. The postures of the levers 49 to 51 can be changed in the front-rear direction integrally with the upper column 46.

  In the second embodiment shown in FIGS. 16 to 18, an output shaft 40 ′ as a traveling drive system to the rear wheels to which power is transmitted from the gear type transmission mechanism 38 is projected on one side surface of the transmission case 2, and the gear type transmission is performed. A PTO shaft 9 protrudes rearward from the rear end of the transmission case 2 from the mechanism 38 via a PTO clutch (not shown). The chain transmission mechanism 60 for transmitting power from the output shaft 40 ′ to the transmission shaft 59 extending in parallel at the front portion of the central case portion 5 b of the rear axle case 5 is disposed inside the traveling frame 3 described above. The chain transmission mechanism 60 includes sprockets 60a and 60b and a chain 60c attached to the output shaft 40 'and the transmission shaft 59. The PTO shaft 9 is also arranged inside the traveling frame 3. The traveling frame 3 and the transmission case 2 are connected in the same manner as in the first embodiment by covering the front part of the traveling frame 3 from the outside to the rear side of the left and right side surfaces of the transmission case 2 and connecting bolts 53. In this configuration, both side plates 3b of the traveling frame 3 are fastened and connected to the side surface of the transmission case 2 in the horizontal direction from the left and right outer sides (see FIGS. 16 and 17). Further, the rear side of the upper surface plate 3a of the traveling frame 3 is fastened and connected by a connecting bolt 55 to a pair of bracket portions 54 protruding upward from the upper portion of the central case portion 5b in the rear axle case 5 (see FIG. 16 and FIG. 16). (See FIG. 18). Further, the fin pieces 3c on the left and right sides of the traveling frame 3 are fastened and connected by a connecting bolt 57 to a pair of bracket portions 56 protruding forward from the front portion of the central case portion 5b (see FIGS. 16 and 18). ).

  Although not shown, the output shaft 41 that is a rotating shaft extending rearward as in the first embodiment may be disposed inside the traveling frame 3.

  As described above, since the traveling frame 3 has a U-shaped section that is open downward in cross section, when the riding rice transplanter travels in a deep field of mud compared to a closed shape having a bottom plate such as a rectangular tube in cross section. Even when the traveling frame 3 is in a state of being submerged in the mud, mud pushing can be reduced and the traveling resistance can be reduced. Further, since the traveling frame 3 is U-shaped with the cross section opened downward, the bending rigidity with respect to the load of the traveling body between the front and rear axles received from the front wheels 4a and the rear wheels 5a can be increased while having a lightweight and compact configuration. . Furthermore, the bending rigidity can be increased by providing outward substantially horizontal fin pieces 3 c at the lower ends of the left and right side plates 3 b of the traveling frame 3.

  The connecting bolt 53 between the transmission case 2 and the traveling frame 3 is configured to be detachable from the left and right side surfaces of the traveling machine body, while the connecting bolts 55 and 57 between the traveling frame 3 and the rear axle case 5 are connected to the upper surface side of the traveling machine body. Since the transmission case can be attached to and detached from the main frame of the main body of the traveling machine body regardless of the machining accuracy of each part when the transmission case 2, the traveling frame 3 and the rear axle case 5 are formed as single parts, respectively. Position adjustment at 53, 55, and 57 is possible, and the assembly work is facilitated.

  A power transmission mechanism 31 to the traveling drive system and the PTO drive system is built in the rear side of the mission case 2, and either the travel drive system or the PTO drive system is installed in the travel frame 3 (inside of the downward opening). If the PTO shaft 9 or the transmission shaft 41 or the chain transmission mechanism 60, which is the transmission member, is disposed, and the other transmission member is disposed along the outer side of one side of the traveling frame 3, the transmission member 3 is disposed on the inner side of the traveling frame 3. Further, the upper side and the left and right sides of the transmission member can be protected.

  A power transmission mechanism for the travel drive system and the PTO drive system is built in the rear side of the mission case 2, and both the travel drive system and PTO drive system transmission members (PTO shaft 9) are installed in the travel frame 3. Alternatively, if the transmission shaft 41 or the chain transmission mechanism 60) is disposed, all these transmission members can be protected by the traveling frame 3.

It is a side view of the riding type rice transplanter according to the present invention. It is a top view of a riding type rice transplanter. It is a perspective view of a traveling machine body. 1 is a perspective view of a transmission case, an engine, a front axle case, a traveling case, and a steering according to a first embodiment. It is also a plan view. It is a side view of the mission case and engine of a 1st embodiment. It is a side view which cuts and shows the inside of a part of mission case. It is a top view which cuts and shows the inside of a part of mission case. It is a side view which shows the internal mechanism of a mission case. It is a top view which shows the internal mechanism of a mission case. It is a top view which shows the connection state of the transmission case of 1st Embodiment, a traveling case, and a rear axle case. FIG. 3 is a left perspective view showing a connected state of the transmission case, the traveling case, and the rear axle case of the first embodiment. It is a right perspective view similarly. It is a right side view similarly. It is the figure seen from the rear surface of a rear axle case. It is a top view which shows the connection state of the mission case of 2nd Embodiment, a traveling case, and a rear axle case. It is a left view which similarly shows the connection part of a mission case and a traveling case. It is a perspective view which similarly shows the connection part of a traveling case and a rear axle case.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Main frame 1b Subframe 2 Mission case 3 Traveling frame 4 Front axle case 5 Rear axle case 7 Seedling planting device 9 PTO shaft 21 Engine 29 Traveling drive system 30 PTO drive system 31 Power transmission mechanism 38 Gear-type transmission mechanism 40 Output shaft 41, 41 'transmission shaft 53, 55, 57 connecting bolt 60 chain transmission mechanism

Claims (4)

In the riding type rice transplanter where the power unit is arranged at the front part of the traveling machine body and the seedling planting device is connected to the rear part of the traveling machine body so that it can be raised and lowered,
A traveling machine body is configured by connecting a transmission case, which has an engine fixed to the upper surface, and a front axle case, and a rear axle case, connected by a longitudinal longitudinal traveling frame, and the traveling frame has an open downward section. Riding type rice transplanter, characterized by its U-shape. The connecting bolt between the transmission case and the traveling frame is configured to be removable from the left and right side surfaces of the traveling body,
The riding type rice transplanter according to claim 1, wherein a connecting bolt between the traveling frame and the rear axle case is configured to be detachable from an upper surface side of the traveling machine body.   A power transmission mechanism to the travel drive system and the PTO drive system is built in the rear side of the transmission case, and either the travel drive system or the PTO drive system is disposed in the travel frame, The riding type rice transplanter according to claim 1 or 2, wherein the other transmission member is arranged along the outer side of one side of the traveling frame.   A power transmission mechanism for a travel drive system and a PTO drive system is built in the rear side of the transmission case, and transmission members for both the travel drive system and the PTO drive system are arranged in the travel frame. The riding type rice transplanter according to claim 1 or 2.

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