JP3717437B2 - Ride type paddy field work machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
According to the present invention, an upward opening is formed on the upper surface of the traveling mission case, a control valve mounting seat for raising and lowering the working device is formed on the periphery of the opening, and a traveling machine body is formed on both side surfaces forming the opening. It is related with the riding-type paddy field machine which forms the attaching part for attaching left-and-right machine body frame.
[0002]
[Prior art]
In the above mission case, it has an upward opening and also has a mounting part for mounting the fuselage frame, so it is possible to obtain sufficient strength as a case only by securing the strength necessary for storing the mission. I can't.
[0003]
[Problems to be solved by the invention]
Therefore, it is conceivable to increase the thickness of the mission case, but if this is done, the weight will increase, and if die casting is performed, quality assurance will not be possible due to the formation of nests and other means of reinforcement. It was necessary to consider.
[0004]
An object of the present invention is made by paying attention to such points, and is to provide a riding-type paddy field work machine equipped with a transmission case having sufficient strength without causing adverse effects such as weight increase. is there.
[0005]
[Means for Solving the Problems]
[Configuration, operation and effect of the invention according to claim 1]
[0006]
(Configuration) In the riding paddy field work machine according to the first aspect of the present invention, the first mounting portion formed on one side surface of the transmission case is disposed below the first upper mounting boss and the first upper mounting boss. The first lower mounting boss is positioned so as to project laterally, and the operation shaft is inserted through the first upper and lower mounting bosses at the intermediate position between the two mounting bosses. Protruding the front mounting boss from one side of the mission case,
A first longitudinal rib connecting the upper and lower first mounting bosses, an upper oblique rib connecting the first upper mounting boss and the first front mounting boss, the first lower mounting boss and the first front The lower oblique rib connecting the part mounting boss is provided to form a reinforcing structure, and a downwardly bulging arc-shaped rib is formed across the first longitudinal rib and the upper oblique rib. .
[0007]
(Operation) On one side of the transmission case, the structure of the first mounting portion is arranged and configured in a state where the first upper mounting boss, the first lower mounting boss, and the first front mounting boss form a substantially triangular shape. Therefore, by connecting these mounting bosses with the first vertical rib, the upper oblique rib, and the lower oblique rib, the three attachment bosses can be coupled by the ribs. Dispersion of stress concentration.
Moreover, since the three ribs form a triangular reinforcing structure with the mounting boss at the apex, the rib itself can withstand heavy loads without increasing the thickness more than necessary.
[0008]
Since the first vertical rib and the oblique upper rib are connected by the arc-shaped rib, the first vertical direction connecting the first upper mounting boss and the first lower mounting boss provided to mount the body frame. The ribs can be strengthened.
[0009]
(Effects) Not only the ribs but also the mounting bosses arranged in the three corners by the ribs are utilized as the strength members, thereby achieving a strength configuration that is lightweight and does not cause the formation of nests.
[0010]
[Configuration, operation and effect of invention of claim 2]
[0011]
(Configuration) The riding paddy field work machine according to the second aspect of the present invention has an upward opening formed on the upper surface of the traveling mission case, and a control valve mounting seat for raising and lowering the working device is formed on the periphery of the opening. A riding-type paddy field work machine in which mounting parts for attaching the left and right body frames of the traveling body are formed on both side surfaces of the mission case located on the left and right sides of the opening,
The second mounting portion formed on the other side surface of the transmission case is configured by projecting a second upper mounting boss and a second lower mounting boss positioned below the second upper mounting boss in a lateral direction,
A reinforcing pin is bonded in parallel to the second upper mounting boss, and a horizontal rib is provided across the reinforcing pin and the other side surface of the transmission case. The reinforcing pin is formed after the transmission case is molded. Further, it is also used as a protruding pin for mold release that receives a protruding force when a molded product is extracted.
[0012]
(Operation) On the other side surface of the transmission case, the mounting bosses are not arranged in a triangular shape like the one side surface described above, and therefore the rib as in the first mounting portion cannot be arranged. Instead, when the mission case is molded, the projecting pin, which is necessary for releasing the molded product, is arranged in parallel with the second upper mounting boss and is integrally connected to form the second upper mounting. The strength of the boss is improved. The second upper mounting boss and the reinforcing pin are provided with a strength configuration so that the horizontal rib does not cause further horizontal collapse.
[0013]
(Effect) Therefore, the strength structure using the protruding pin required at the time of mold release can be achieved without incurring an increase in weight, and the effect of sharing can also be achieved.
[0014]
[Configuration, operation and effect of invention of claim 3]
[0015]
(Configuration) The riding paddy field work machine according to the invention according to claim 3 has an upward opening formed on the upper surface of the traveling mission case and a control valve mounting seat for raising and lowering the working device at the periphery of the opening. A riding-type paddy field work machine in which mounting parts for attaching the left and right body frames of the traveling body are formed on both side surfaces of the mission case located on the left and right sides of the opening,
The first mounting portion formed on one side surface of the transmission case is configured by projecting a first upper mounting boss and a first lower mounting boss positioned below the first upper mounting boss in a lateral direction. The first front mounting boss that is inserted through the operation shaft is projected from one side of the transmission case in a state of being positioned on the front side of the machine body from both mounting bosses at an intermediate position between the first upper and lower mounting bosses.
A first longitudinal rib connecting the first upper and lower mounting bosses, an upper oblique rib connecting the first upper mounting boss and the first front mounting boss, the first lower mounting boss and the first front Forming a reinforcing structure by providing a lower oblique rib connecting the part mounting boss, and forming a downward swollen arc-shaped rib over the first longitudinal rib and the upper oblique rib,
A second mounting portion formed on the other side surface of the transmission case is configured by projecting a second upper mounting boss and a second lower mounting boss located below the second upper mounting boss in a lateral direction. ,
A reinforcing pin is bonded in parallel to the second upper mounting boss with respect to the second upper mounting boss, and a horizontally oriented rib is provided across the reinforcing pin and the other side of the transmission case. The case is also used as a protruding pin for mold release that receives a protruding force when the molded product is extracted from the mold after the mold is molded.
[0016]
(Operation / Effect) Since the above configuration effectively combines the inventions according to claim 1 and claim 2, the operation effect of the invention according to claim 1 and the effect of the invention according to claim 2 are as follows. Play.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
In FIG. 1 and FIG. 2, a riding type rice transplanter of a five-row planting specification is shown as an example of a paddy field working machine. This riding type rice transplanter has a five-row planting seedling as a working device at the rear of a riding type traveling machine body 3 having a pair of left and right front wheels 1 that can be steered and a pair of left and right rear wheels 2 that cannot be steered. The planting device 4 is connected to be freely moved up and down via a four-link mechanism 5 driven by a lifting cylinder 6, and has a structure in which a fertilizing device 7 having a five-row specification is provided at the rear of the machine body.
[0018]
A transmission case 9 provided with a front axle case 9a that pivotally supports the front wheel 1 is connected and fixed to the front part of the body frame 8 of the traveling body 3, and the rear wheel 2 is pivoted to the rear part of the body frame 8. A supporting rear transmission case 10 is supported in a freely rolling manner. In addition, an engine 11 having a lateral output shaft 11 a is mounted via a vibration-proof rubber 12 at a position near the front of the mission case 9, and a boarding operation unit 13 is provided in a state of being positioned behind the engine 11. ing. The boarding driver 13 includes a steering handle 14, a driver seat 15, a driver step 24, and the like for steering the front wheel 1.
[0019]
The seedling planting device 4 mounts seedlings for 5 lines and cuts seedlings from the lower end of the seedling platform 16 and the seedling platform 16 which are reciprocated by a set stroke in the left-right direction, and plant them on the field. It consists of five sets of rotating planting mechanisms 17 and three leveling floats 18 for leveling the planting location, etc., and reserve seedlings to be supplied to the seedling table 16 are placed in a plurality of stages. Reserve seedling platforms 49 to be placed are provided on the left and right of the front part of the machine body.
[0020]
The fertilizer application device 7 is mounted on the traveling machine 3 between the driver's seat 15 and the seedling planting device 4, and a fertilizer hopper 19 that stores powdered fertilizer and fertilizer in the fertilizer hopper 19 are set in a set amount. An unwinding mechanism 20 for unwinding and an electric fan 23 for air-feeding the unloaded fertilizer to the groove forming device 21 provided on the leveling float 18 of the seedling planting device 4 via the supply hose 22 are provided.
[0021]
As shown in FIGS. 3 and 4, on the left side surface of the transmission case 9, a hydrostatic stepless machine is provided with a lateral input shaft 41a linked to the output shaft 11a of the engine 11 via a belt transmission device 40. A main transmission 41 comprising a transmission (HST) is connected in a state in which its output is transmitted to the mission case 9 by a lateral shaft, and its input shaft 41a and output shaft 41b are arranged in the front-rear direction. ing.
[0022]
The belt transmission device 40 winds a transmission belt 40c between an output pulley 40a attached to the output shaft 11a of the engine 11 and an input pulley 40b attached to the input shaft 41a of the main transmission 41, and applies tension to the transmission belt 40b. A tension pulley 40d is provided.
[0023]
The input shaft 41 a of the main transmission 41 is extended to the right through the front portion of the mission case 9. A main speed change lever 46 for operating the main speed change device 41 is arranged on the left side of the steering handle 14, and the forward speed can be changed by a swinging operation from the neutral position to the front of the main speed change lever 46. Further, the reverse speed can be changed by a swinging operation from neutral to backward.
[0024]
As shown in FIG. 4, a hydraulic pump 42 driven by the extended end of the input shaft 41 a of the main transmission 41 is connected to the right side surface of the mission case 9, and the upper surface of the mission case 9 is As shown in FIGS. 3 and 4, a torque generator 43 constituting a hydraulic power steering device interlocked with the handle shaft 14 a of the steering handle 14, a work valve lifting control valve 44 for controlling the lifting cylinder 6, Is attached.
[0025]
The mission case 9 is also used as a hydraulic oil tank, and the lubricating oil in the mission case 9 is taken out as hydraulic oil through an oil filter 45 attached to the right side surface of the mission case 9, and the main transmission 41 and the hydraulic pump 42 are extracted. The pressure oil from the hydraulic pump 42 is supplied to the torque generator 43 and then supplied to the elevating cylinder 6 through the control valve 44. The drain oil of the main transmission 41 is returned to the front axle case 9 a communicating with the transmission case 9, and the drain oil from the control valve 44 is directly returned to the transmission case 9.
[0026]
As shown in FIGS. 5 and 6, the transmission case 9 includes an input shaft 57 connected to the output shaft 41 b of the main transmission 41 via a coupling 56, and a gear 59 splined to the input shaft 57. A sub-transmission device 51 that shifts the extracted power in two steps, and a differential mechanism 52 that transmits the output from the sub-transmission device 51 to the left and right front wheels 1 are installed and branched from the traveling transmission system. The one-way clutch 53 that transmits only the forward rotation power of the motive power to the seedling planting device 4, the planting speed change mechanism 54 for changing the power between the plant and the seedling planting device 4 is intermittently transmitted. The planting clutch 55 is equipped.
[0027]
The sub-transmission device 51 is constituted by a full synchromesh gear transmission mechanism. The transmission input shaft 64 includes a large-diameter transmission gear 65 and a small-diameter transmission gear 66 that are engaged with the gear 59 of the input shaft 57. On the other hand, a small-diameter gear 68 that always meshes with the large-diameter transmission gear 65 and a large-diameter gear 69 that always meshes with the small-diameter transmission gear 66 are mounted on the transmission output shaft 67 so as to be freely rotatable. In addition, a synchromesh portion 60 is interposed between the small diameter gear 68 and the large diameter gear 69. The synchromesh section 60 is provided with a shift sleeve 61. By shifting the shift sleeve 61 to the left side in the figure, the large diameter gear 69 is linked to the transmission output shaft 67 via the small diameter transmission gear 66. By shifting the shift sleeve 61 to the right in the figure, the small-diameter gear 68 is linked to the transmission output shaft 67 via the large-diameter transmission gear 65 for high-speed transmission. ing. The sub-shift lever 47 for operating the shift sleeve 61 of the sub-transmission device 51 is disposed on the left side of the driver seat 15 so as to be able to swing back and forth. By holding the position at the set neutral position by the detent means 50, the auxiliary transmission 51 can be kept neutral.
[0028]
An operation structure for the auxiliary transmission 51 will be described. As shown in FIG. 7, the auxiliary transmission lever 47 and an operation shaft 51A for auxiliary transmission, which will be described later, are linked by a linkage rod 51B and a bell crank 51C, and an engagement groove is formed on the operation shaft 51A and engaged. A detent means 50 is configured by providing a spring ball mechanism which can be engaged and disengaged in the groove. Although the storage of the spring ball mechanism of the detent means 50 is not shown, it is attached to a first front mounting boss 28 which will be described later, and as shown in FIGS. It is housed in an auxiliary boss portion 28A that protrudes rearward from the intermediate portion.
[0029]
The differential mechanism 52 is configured to be capable of differential lock. That is, a shift member 74 is attached to one of the differential shafts 72 extending to the left and right so as to be rotatable integrally with the differential shaft 72 and shiftable. As shown in FIG. The state of being separated from 73 is a normal diff-lock release state, and the shift member 74 is shifted rightward in the drawing and engaged with the end face of the diff case 73 to bring about a diff-lock state. The differential lock operation means for switching the differential mechanism 52 between the differential lock state and the differential lock release state is configured such that the shift member 74 is biased to the differential lock release position by a spring (not shown), and the rear left side of the foot of the riding operation unit 13 The diff lock pedal 48 and the shift member 74 are interlocked and connected to each other, and the diff lock release state is maintained by releasing the foot from the diff lock pedal 48 during normal driving, so that the vehicle body can be taken in and out of the field and the transport vehicle. In the case of loading / unloading the fuselage onto / from the loading platform, the diff lock pedal 48 is depressed with the left foot to bring about a diff lock state, and the left and right front wheels 1 can be driven at a constant speed.
[0030]
The differential case 73 of the differential mechanism 52 has a gear integrally formed with an input gear 76 that meshes with a transmission output gear 75 that is splined to the transmission output shaft 67 and a main transmission shaft 77 for transmission to the rear wheel 2. An output gear 79 that meshes with 78 is attached.
The one-way clutch 53 is provided so as to transmit only forward rotation of the rotation of the transmission input shaft 64 to the planting transmission system using the transmission input shaft 64 as a branch point from the traveling transmission system to the planting transmission system. ing.
[0031]
The planting speed change mechanism 54 is mounted on the speed change output shaft 67 so as to be freely rotatable only relative to the output shaft 80 of the one-way clutch 53 via a gear 81. A group of driven gears 87 which are always engaged with and interlocked with the planting shift output shaft 86 which is mounted in a state of rotating integrally with the planting gear 83 and interlocked with the planting clutch 55 via bevel gears 84 and 85. Is mounted so as to be relatively rotatable, and a transmission ball 89 for interlockingly connecting the driven gear 87 to the planting transmission output shaft 86 by engaging with an engaging recess 88 formed in the center hole of each driven gear 87 is a planting transmission output. The structure is provided with an operation shaft 90 that is provided so as to rotate integrally with the shaft 86 and that selectively engages the transmission ball 89 with the engaging recess 88. In other words, the driven gear 87 is selectively coupled to the planting shift output shaft 86 so that the driven gear 87 used for transmission is changed to perform a shift of a plurality of stages (in the example, six stages). Has been.
[0032]
Next, the reinforcing structure in the mission case 9 will be described. As shown in FIG. 7, a rectangular tube-shaped case portion 25 is formed in the rear portion of the traveling mission case 9, and an upward opening 25a is formed on the upper surface of the rectangular tube-shaped case portion 25, and the opening 25a. A mounting seat 25b for the control valve 44 for raising and lowering the working device is formed at the periphery of the working device. Mounting portions A and B for attaching the left and right body frames 8 and 8 of the traveling body 3 are formed on both side surfaces 9A and 9B of the mission case 9 located on the left and right sides of the rectangular tube case 25 having the opening 25a. It is.
[0033]
The first mounting portion A formed on the left side surface as one side surface of the mission case 9 is turned sideways by the first upper mounting boss 26 and the first lower mounting boss 27 positioned below the first upper mounting boss 26. And the slide operation shaft 51A of the auxiliary transmission 51 is inserted in a state where the first upper and lower portion mounting bosses 26 and 27 are positioned at the middle of the first upper and lower portion mounting bosses 26 and 27 in front of the body. A first front mounting boss 28 projects from the left side surface of the mission case 9.
[0034]
As shown in FIGS. 8 and 9, a first vertical rib 29 that connects the first upper and lower mounting bosses 26, 27, and an upper oblique rib that connects the first upper mounting boss 26 and the first front mounting boss 28. 30 and a downwardly inclined rib 31 connecting the first lower mounting boss 27 and the first front mounting boss 28 are provided to form a reinforcing structure. A downwardly bulging arc-shaped rib 32 is formed between the first vertical rib 29 and the upper oblique rib 30.
[0035]
The connecting portions of the first vertical ribs 29 and the upper oblique ribs 30 with respect to the first upper mounting bosses 26 are formed wide so as to improve the strength.
The first longitudinal rib 29 has a laterally projecting amount from the case portion that is short on the straight surface 29A below the first upper mounting boss 26 and is connected to the first lower mounting boss 27 from an intermediate position. It is formed on the inclined surface 29B so as to be gradually longer when it is positioned. The reason why the protruding lengths are set to different lengths is to secure a space for using a jig such as an impact wrench for operating the detent means 50 for the auxiliary transmission 51 described above.
[0036]
As shown in FIGS. 7 and 10, the second mounting portion B is formed on the right side surface of the transmission case 9 opposite to the first mounting portion A, and the second mounting portion B is connected to the second upper mounting boss 33 and its The second lower mounting boss 34 is provided so as to project laterally and is positioned below the second upper mounting boss 33.
A reinforcing pin 35 is adhered to the second upper mounting boss 33 in parallel to the second upper mounting boss 33, and a horizontal rib 36 is provided across the reinforcing pin 35 and the right side surface of the transmission case 9, 2 The upper mounting boss 33 is reinforced. The second upper mounting boss 33 and the second lower mounting boss 34 are connected by a second vertical rib 37, and a pin portion 37 </ b> A is formed at an intermediate position of the second vertical rib 37.
The reinforcing pin 35 and the pin portion 37A are for mold release that comes into contact with a bolt or the like that applies a protruding force for mold release when the molded product of the mission case 9 is extracted from the mold after the mission case 9 is molded. It is also used as a protruding pin.
[0037]
As shown in FIG. 7, the left and right airframe frames 8 are composed of a rectangular frame 8A in a posture along the front-rear direction and a plate-like frame 8B hanging downward from the tip of the rectangular frame 8A. 1 Attached to the upper mounting boss 26, the right square frame 8 A is attached to the second upper mounting boss 33, the left plate frame 8 B is attached to the first lower mounting boss 27, and the right plate frame 8 B is attached to the second lower mounting boss 34. It is installed in.
[0038]
As shown in FIG. 11, the first vertical rib 29 of the first mounting portion A has a small amount of lateral protrusion in the direction parallel to the mounting boss, as described above, in the upper part near the first upper mounting boss 26. Since the lower protrusion close to the first lower mounting boss 27 is formed on an inclined surface that gradually increases, the upper straight part has a shape in which a so-called steal a is provided on a part of the rib.
On the other hand, in the second mounting portion B, the lateral protrusion amount of the vertical rib 37 connecting the second upper mounting boss 33 and the second lower mounting boss 34 is constant vertically.
However, when the amount of lateral protrusion from the case 25 between the first upper mounting boss 26 and the like and the second upper mounting boss 33 is compared, the second upper mounting boss 33 and the like are larger. On the other hand, in the first mounting portion A, since the stealing a is provided on a part of the rib, the rigidity balance between the first mounting portion A and the second mounting portion B can be secured by the stealing a. ing.
[0039]
[Another embodiment]
(A) Riding type paddy field machines such as a riding type rice transplanter and a direct sowing machine are applicable to the vehicle having the traveling mission case 9 described above.
(B) The first attachment portion A and the second attachment portion B may be provided by replacing the left and right side surfaces of the mission case 9.
(C) Although the operation shaft 51A of the auxiliary transmission 51 is inserted through the first front mounting boss 28, an operation shaft such as an operation shaft of a planting clutch may be inserted.
(2) The configuration in which the reinforcing pin 35 is bonded in parallel to the second upper mounting boss 33 has been described. However, the second upper mounting boss 33, the reinforcing pin 35, and the horizontal rib 36 can be integrally formed by molding. If so, the integrally formed product is also included in the invention of claim 2.
[Brief description of the drawings]
[Fig. 1] Whole side view of rice transplanter [Fig. 2] Overall plan view of rice transplanter [Fig. 3] Side view of front of aircraft [Fig. 4] Plan view of front of aircraft [Fig. 5] Transmission mechanism in transmission case FIG. 6 is a sectional view showing a part of the transmission mechanism in the transmission case. FIG. 7 is a perspective view showing a state before the fuselage frame is attached to the transmission case. FIG. Side view [Fig. 9] Perspective view showing the first mounting portion [Fig. 10] Side view showing the second mounting portion [Fig. 11] Rear view showing the upper part of the transmission case with the control valve mounting seat [Description of symbols]
3 traveling machine body 8 machine body frame 9 mission case 25a upward opening 25b control valve mounting seat 26 first upper mounting boss 27 first lower mounting boss 28 first front mounting boss 29 first vertical rib 30 upper oblique rib 31 lower Oblique rib 32 Arc-shaped rib 33 Second upper mounting boss 34 Second lower mounting boss 35 Reinforcement pin 36 Horizontal rib 37 Second vertical rib 51 Subtransmission 51A Operation shaft

Claims (3)

An upper opening is formed on the upper surface of the traveling mission case, a control valve mounting seat for raising and lowering the working device is formed on the periphery of the opening, and left and right body frames of the traveling aircraft are formed on both side surfaces forming the opening. A riding-type paddy field work machine forming a mounting part for mounting,
The first mounting portion formed on one side surface of the transmission case is configured by projecting a first upper mounting boss and a first lower mounting boss positioned below the first upper mounting boss in a lateral direction. A first front mounting boss that is inserted through the operation shaft in a state of being positioned on the front side of the machine body from both mounting bosses at an intermediate position between the first upper and lower mounting bosses, and projecting from one side of the transmission case;
A first longitudinal rib connecting the upper and lower first mounting bosses, an upper oblique rib connecting the first upper mounting boss and the first front mounting boss, the first lower mounting boss and the first front Riding type paddy field work machine which forms a reinforcing structure by providing a lower oblique rib connecting the part mounting boss, and forms a lower swollen arc-shaped rib across the first longitudinal rib and the upper oblique rib . On the upper surface of the traveling mission case, an upward opening is formed and a control valve mounting seat for raising and lowering the working device is formed on the periphery of the opening, on both sides of the mission case located on the left and right sides of the opening. , A riding type paddy field work machine forming a mounting part for mounting the left and right machine body frames of the traveling machine body,
The second mounting portion formed on the other side surface of the transmission case is configured by projecting a second upper mounting boss and a second lower mounting boss positioned below the second upper mounting boss in a lateral direction,
A reinforcing pin is bonded in parallel to the second upper mounting boss, and a horizontal rib is provided across the reinforcing pin and the other side surface of the transmission case. The reinforcing pin is formed after the transmission case is molded. Riding-type paddy field machine that is also used as a protruding pin for mold release that receives a protruding force when a molded product is extracted. On the upper surface of the traveling mission case, an upward opening is formed and a control valve mounting seat for raising and lowering the working device is formed on the periphery of the opening, on both sides of the mission case located on the left and right sides of the opening. , A riding type paddy field work machine forming a mounting part for mounting the left and right machine body frames of the traveling machine body,
The first mounting portion formed on one side surface of the transmission case is configured by projecting a first upper mounting boss and a first lower mounting boss positioned below the first upper mounting boss in a lateral direction. The first front mounting boss that is inserted through the operation shaft is projected from one side of the transmission case in a state of being positioned on the front side of the machine body from both mounting bosses at an intermediate position between the first upper and lower mounting bosses.
A first longitudinal rib connecting the first upper and lower mounting bosses, an upper oblique rib connecting the first upper mounting boss and the first front mounting boss, the first lower mounting boss and the first front Forming a reinforcing structure by providing a lower oblique rib connecting the part mounting boss, and forming a downward swollen arc-shaped rib over the first longitudinal rib and the upper oblique rib,
A second mounting portion formed on the other side surface of the transmission case is configured by projecting a second upper mounting boss and a second lower mounting boss located below the second upper mounting boss in a lateral direction. ,
A reinforcing pin is bonded in parallel to the second upper mounting boss with respect to the second upper mounting boss, and a horizontally oriented rib is provided across the reinforcing pin and the other side of the transmission case. A riding-type paddy field work machine that is also used as a protruding pin for mold release that receives a protruding force when a molded product is extracted from the mold after the case is molded.

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