JP2015188348A - Work device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a feed case to be coupled firmly by fastening to a main frame, in a work device including the feed case coupled by fastening with the main frame at a coupling part, the feed case storing a transmission device outputting power to a work part.SOLUTION: A coupling part 90 includes: a coupling seat part 93 formed integrally with a feed case 16; and a coupling member 94 separately formed from the coupling seat part 93. The coupling seat part 93 is coupled by fastening with an upper end face U of a main frame 15 by a pop nut 96. An upper end side of the coupling member 94 is coupled by fastening with the coupling seat part 93 by a coupling bolt 97a. A lower end side of the coupling member 94 is coupled by fastening with a rear end face B of the main frame 15 by a coupling bolt 92 directed in front/rear of a machine body.

Description

  The present invention includes a main frame that faces the machine body, a feed case that is supported by the main frame, and a transmission device that receives driving force from the traveling machine body and outputs the input driving force to a working unit. Related to the working device.

  Conventionally, there has been a seedling planting device disclosed in Patent Document 1. In this seedling planting apparatus, a connecting portion for connecting the feed case to the main frame is provided by integrally forming the feed case, and the connecting portion is configured to be tightened and connected to the upper end surface and the rear end surface of the main frame.

Japanese Patent Laid-Open No. 6-169611

  When the conventional technique for fastening and connecting the main frame and the feed case is adopted, the portion connected to the upper end surface of the main frame and the portion connected to the front end surface or the rear end surface of the main frame are tightened to the main frame. If this is performed strongly, cracks due to stress concentration may occur particularly in the portion where the portion connected to the upper end surface and the portion connected to the front end surface or the rear end surface are connected. Can not be tightened too much.

  A driving force from the traveling machine body is input, a working unit transmission that outputs the input driving force to the working unit is housed in the feed case, and a speed change operation shaft that performs a shifting operation of the working unit transmission is provided on the side wall of the feed case. Even if an attempt is made to change the speed of the working part transmission device in the case where it is pierced so as to slide, if there is an operation failure such as the shifting operation shaft rattling, the working part transmission device cannot be shifted smoothly.

  A working unit transmission that receives driving force from the traveling machine body and outputs the input driving force to the working unit is housed in the feed case, and the rotating transmission shaft is arranged side by side in the axial direction of the rotating transmission shaft as the working unit transmission. A transmission device having a plurality of transmission gears supported so as to be rotatable relative to each other and a shift device having a shift key supported so as to be slidable in the axial direction of the rotation transmission shaft in a key groove provided in the rotation transmission shaft. The shift key is configured to slidably operate the shift key so that the plurality of transmission gears are selectively engaged with the rotary transmission shaft so as to be integrally rotatable, and the shift key is engaged with the plurality of transmission gears. A spring that is biased as much as possible is accommodated in a spring accommodating portion provided on the rotation transmission shaft.

  When the urging force provided by the spring is weak, the shift key is likely to be detached from the shift transmission gear due to the drive load applied to the shift transmission gear.

  The object of the present invention is not only to strengthen the fastening connection of the feed case to the main frame, or to strengthen the fastening connection of the feed case to the main frame, but also to facilitate the work of detaching the feed case from the main frame. It is an object of the present invention to provide a working device that can easily perform a shifting operation of a partial transmission device or that can easily avoid self-removal of a shift key.

The working device according to the first invention is:
The mainframe facing the aircraft,
A feed case supported by the main frame by being tightened and connected to the main frame;
A driving force from the traveling machine body is input, and a transmission device that outputs the input driving force to the working unit is accommodated in the feed case,
The connecting portion includes a connecting seat portion formed integrally with the feed case, and a connecting member formed as a separate member from the connecting seat portion,
The connecting seat is configured to be tightened and connected to the upper end surface of the main frame by a pop nut attached to the main frame,
The upper end side of the connecting member is configured to be tightened and connected to the connecting seat portion by a connecting bolt,
The lower end side of the connecting member is configured to be clamped and connected to the front end surface or the rear end surface of the main frame by a connecting bolt facing the front and rear of the fuselage.

  According to this configuration, the connecting seat portion that is tightened and connected to the upper end surface of the main frame and the connecting member that is tightened and connected to the front end surface or the rear end surface of the main frame are separate members, and the connecting seat portion is attached to the main frame. On the other hand, it is tightened and connected with a pop nut, and the lower end side of the connecting member is tightened and connected to the main frame with the connecting bolt in the longitudinal direction of the fuselage. Cracks due to stress concentration are less likely to occur compared to the case where the portions corresponding to the seat and the connecting member are integral members.

  Therefore, according to the first aspect of the present invention, the coupling seat and the coupling member are strongly tightened with respect to the main frame, and the feed case is firmly supported by the main frame.

The working device according to the second invention is:
The mainframe facing the aircraft,
A feed case supported by the main frame by being tightened and connected to the main frame;
A working unit drive case supported by a rear end surface of the main frame below the feed case;
A driving force from the traveling machine body is input, and a transmission device that outputs the input driving force to the working unit driving case is accommodated in the feed case,
The connecting portion includes a connecting seat portion formed integrally with the feed case, and a connecting member formed as a separate member from the connecting seat portion,
The connecting seat is configured to be tightened and connected to the upper end surface of the main frame by a pop nut attached to the main frame,
The upper end side of the connecting member is configured to be tightened and connected by a connecting bolt to a support portion provided at the rear portion of the connecting seat portion,
The lower end side of the connecting member is configured to be tightened and connected to the rear end surface of the main frame by a connecting bolt facing the front and rear of the fuselage,
The working unit drive case is provided with a locking part that can be engaged with and disengaged from the upper end of the main frame and can be slid laterally.
The support part is provided with a recessed part into which the engaging part enters when the working part drive case is laterally slid with respect to the feed case.

  According to this configuration, the connecting seat portion that is fastened and connected to the upper end surface of the main frame and the connecting member that is fastened and connected to the rear end surface of the main frame are separate members, and the connecting seat portion is popped with respect to the main frame. Since the lower end side of the connecting member is tightened and connected to the main frame in the front-rear direction of the fuselage with the connecting bolt, the connecting seat portion and the connecting member are strongly connected to the main frame. Cracks due to stress concentration are less likely to occur compared to the case where the portions corresponding to each of the connecting members are integral members.

  According to this configuration, in order to adjust the position of the working unit drive case closer to or away from the feed case, the working unit drive case is placed on the main frame with the locking unit engaged with the main frame. By performing a sliding operation, the position of the working unit drive case can be adjusted while being supported by the main frame. As the working part drive case is slid, the engaging part enters the recessed part of the support part, so that the slidable range of the working part drive case can be widened.

  Therefore, according to the second aspect of the present invention, the coupling seat and the coupling member are strongly tightened with respect to the main frame, and the feed case is firmly supported by the main frame. And when removing the working unit drive case from the main frame for inspection and repair work, the working unit drive case is supported by the main frame while supporting a part of the load of the working unit drive case in a wide range of movement with respect to the main frame. By sliding, the position of the working unit drive case with respect to the feed case can be easily adjusted, and work can be performed efficiently.

In the third aspect of the invention, there is provided a working unit drive case that is supported by the main frame at a lateral side of the feed case, and that is arranged in a lateral direction with the working unit drive case below the feed case,
An even number of working parts are provided which are supported by a working part driving case on the lateral side of the feed case and a working part driving case below the feed case and are arranged in the lateral direction of the machine body.

  According to the third aspect of the present invention, the even-numbered work sections arranged in the machine body lateral direction are provided. For example, in the seedling planting apparatus, even-numbered work can be performed so that 6-row planting or 8-row planting planting work can be performed. As described above, when an even number of working parts are provided, a working part drive case supported by the main frame is provided below the feed case, but when the working part drive case below the feed case is removed, locking is performed. By sliding the working part drive case until the part enters the recessed part, the working part drive case can be moved laterally with respect to the feed case.

The working device according to the fourth invention is:
The mainframe facing the aircraft,
A feed case supported by the main frame,
The working force transmission device that receives the driving force from the traveling machine body, shifts the inputted driving force and outputs it to the working portion is housed in the feed case,
A speed change operation shaft for speed change operation of the working unit transmission is provided so as to slide in the lateral direction of the fuselage on the side wall portion of the feed case,
A boss that slidably supports the speed change operation shaft is provided on the lateral side wall so as to project outward from the feed case.

  According to this configuration, in order to slidably support the speed change operation shaft by the side wall portion, the support span of the side wall portion is lengthened by the boss portion projecting laterally outward, and the speed change operation shaft is not loose or much occurs. It is supported so that it slides smoothly.

  Therefore, according to the fourth aspect of the present invention, the shift operation shaft can be smoothly slid to shift the working unit transmission lightly and smoothly.

  In the fifth aspect of the invention, the output shaft of the working unit transmission is projected from the lateral side wall in the same projecting direction as the speed change operation shaft, and an output boss that supports the output shaft in a relatively rotatable manner is the lateral side wall. And the protruding length of the output boss portion and the protruding length of the boss portion are set to be the same.

According to the fifth aspect of the present invention, since the protrusion length from the lateral side wall portion of the boss portion and the output boss portion is equal to provide the boss portion with a long support span for supporting the speed change operation shaft, the boss portion and The output boss portion can be provided while being easily formed.
Therefore, the speed change operation shaft is supported by the long support span of the boss part so that it is difficult to rattle, and the work part speed change device can be smoothly operated, but the boss part and the output boss part can be easily formed at low cost. can get.

The working device according to the sixth invention is:
The mainframe facing the aircraft,
A feed case supported by the main frame,
The working force transmission device that receives the driving force from the traveling machine body, shifts the inputted driving force and outputs it to the working portion is housed in the feed case,
The working unit transmission includes a plurality of transmission gears that are aligned in the axial direction of the rotation transmission shaft and are rotatably supported by the rotation transmission shaft, and a key groove provided in the rotation transmission shaft. A shift key that is accommodated so as to be slidable in the axial direction, and that is slidably operated to selectively engage the plurality of transmission gears with the rotation transmission shaft so as to be integrally rotatable,
A spring for biasing the shift key to engage with the plurality of transmission gears is accommodated in a spring accommodating portion provided on the rotation transmission shaft,
The outer diameter of the spring accommodating portion in the rotation transmission shaft is set larger than the outer diameter of other portions.

  According to this structure, the spring storage chamber having a long radial length of the rotary transmission shaft is provided in the spring storage portion, the spring having a strong urging force is stored in the spring storage portion, and the shift key is attached to the transmission gear. It can be held with a strong biasing force in the engaged state.

  Therefore, according to the sixth aspect of the present invention, even if the driving load applied to the transmission gear is strong, the shift key does not easily come off due to the strong biasing force of the spring, and the transmission failure due to the shift key is less likely to occur.

  Since the spring housing part has a larger outer diameter than other parts, the shape of the spring housing part in the axial direction of the rotation transmission shaft is a part having a passive recess for shifting key engagement in the transmission gear. It becomes a circle with a radius larger than the radius of. Therefore, in order to receive and support the side surface of the speed change transmission gear adjacent to the spring accommodating portion of the plurality of speed change transmission gears by the spring accommodating portion, the radially outer end of the support range is more radial than the key groove of the speed change transmission gear. Supporting action is performed over a wide support range extending to the outside, and the transmission gear can be stably supported.

It is a side view which shows the whole working machine. It is a side view which shows a working device. It is a top view which shows the lower part of a working device. It is sectional drawing of a feed case. It is a vertical side view which shows a spring accommodating part. It is a perspective view which shows the support structure of a feed case and a working part drive case. It is a left view which shows the support structure of a feed case and a working part drive case. It is a vertical side view which shows a connection seat part. It is a right view which shows the support structure of a feed case and a working part drive case. It is a vertical side view which shows the support structure of a rolling spindle and an input shaft. It is a perspective view which shows a recessed part. It is a perspective view which shows the front part of a feed case. It is a top view which shows the attachment point of a connecting bolt. It is a top view which shows a latching | locking part.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing an entire working machine according to an embodiment of the present invention. As shown in FIG. 1, the working machine according to the embodiment of the present invention is equipped with a pair of left and right front wheels 2 and 2 on the front portion of the body frame 1 so as to be steerable and drivable. And a pair of left and right rear wheels 3 and 3 are provided so as to be capable of driving. A driving unit 4 provided with an engine 4a for driving the front wheel 2 and the rear wheel 3 and a preliminary seedling placement device 5 disposed on both sides of the driving unit 4 are provided at the front of the traveling machine body. A riding-type driving unit 6 provided with a driving seat 6a and a steering handle 6b is provided at the rear of the traveling machine body.

  The link mechanism 7 is extended from the rear part of the machine body frame 1 so as to be able to swing up and down backwards, and the working device 10 is supported on the extended end of the link mechanism 7. The working device 10 is configured such that the link mechanism 7 is swing-operated by the hydraulic cylinder 7a, so that the grounding float 11 comes into contact with the farm scene, and the ascending work state where the grounding float 11 rises high from the farm scene. Is moved up and down. The working device 10 is driven by driving force transmitted from the engine 4a via a transmission case 9 positioned at the front portion of the traveling machine body and a rotary transmission shaft 9 positioned below the link mechanism 7 in the longitudinal direction of the traveling machine body. Is done.

  The working machine lowers the working device 10 to the lowered working state and causes the traveling machine body to travel, thereby performing seedling planting work in which six working plants can be planted by the working device 10.

The working device 10 will be described.
FIG. 2 is a side view showing the working device 10. FIG. 3 is a plan view showing a lower portion of the work apparatus 10. As shown in FIGS. 2 and 3, the working apparatus 10 has three traveling machine body front-rear working unit drive cases 12 that are arranged at predetermined intervals in the lateral direction of the traveling machine body at the rear of the working apparatus 10. A planting frame F is provided. The seedling planting mechanism 13 is supported so as to be driven on both lateral sides of the rear end of each of the three working unit drive cases 12. Above the front part of the planting frame F, a seedling mount 14 for supplying seedlings to each seedling planting mechanism 13 is provided in an inclined posture with the lower end side positioned rearward. Under the planting frame F, three grounding floats 11 arranged at predetermined intervals in the lateral direction of the traveling machine body are attached.

  The planting frame F includes a main frame 15 that is positioned laterally on the traveling machine body at the front end of the work device 10, a feed case 16 that is supported by a central part of the main frame 15 in the lateral direction of the traveling machine body, and a rear side of the main frame 15. Are provided with three working unit drive cases 12 facing the front and rear of the traveling machine body, which are arranged side by side with a predetermined interval in the lateral direction of the traveling machine body and whose front end is connected to the main frame 15.

  As shown in FIGS. 2 and 7, the feed case 16 includes a rolling support shaft 17 extending forward and backward from the front end portion, and a connecting member 7 b provided at the rear end portion of the link mechanism 7. Is supported by a boss portion 7c provided to be relatively rotatable via a rolling support shaft 17. Therefore, in the feed case 16, the planting frame F rolls with respect to the link mechanism 7 with the axis of the rolling support shaft 17 as the rolling axis R, and the six seedling planting mechanisms 13 roll with respect to the traveling machine body. Is possible.

  Each seedling planting mechanism 13 is supported by the working unit drive case 12 so as to be rotationally driven via a rotating support shaft that faces the traveling machine body, and distributed to both ends of the rotor 13a so as to be rotationally driven. A pair of planting arms 13b, 13b. Each of the pair of planting arms 13b revolves around the rotation axis of the rotor 13a when the rotor 13a is driven to rotate, and is rotated by a drive mechanism (not shown) housed in the rotor 13a. Rotate against. That is, each seedling planting mechanism 13 alternately takes out seedlings from the seedling stage 14 by a pair of planting arms 13b, lowers the seedlings that have been taken out to a field scene, and then raises the seedlings after planting. Go back to 14

A transmission structure that enables the seedling planting mechanism 13 to be driven will be described.
As shown in FIG. 4, a transmission device 20 that drives the seedling planting mechanism 13 is accommodated in the feed case 16. The driving force from the engine 4a transmitted to the rotary transmission shaft 9 located below the link mechanism 7 is input to the transmission device 20 by the front and rear input shaft 21 provided at the front portion of the feed case 16. It is configured. The transmission device 20 outputs the input driving force from the output case 22 that is provided across the output case portion 16 a on the rear end side of the feed case 16 and the front end portion of each working unit drive case 12, and is output to each side of the traveling machine body. This is transmitted to the working unit drive case 12. Each working unit drive case 12 accommodates a planting transmission mechanism (not shown) using a transmission chain or a rotary transmission shaft, and the driving force from the output shaft 22 is applied to the rotational support of the rotor 13a by the planting transmission mechanism. Transmit to the shaft.

The seedling stage 14 will be described.
The seedling mounting table 14 is provided with six seedling mounting portions for supplying seedlings to the six seedling planting mechanisms 13 side by side in the lateral direction of the traveling machine body. The seedling stage 14 is provided above the working unit drive case 12 and guides the lower end of the seedling stage 14, and the seedling stage 14 is erected upward from the main frame 15. A support frame 19 that supports the upper end side is supported so as to be movable in the lateral direction of the traveling machine.

  In order to enable the support of the seedling stage 14 by the support frame 19, as shown in FIG. 2, a rail member 14 a having a downward U-shaped longitudinal section is provided on the back side of the seedling stage 14. is there. A support roller 19a that supports the inside of the rail member 14a is supported by a support arm 19b extending from the upper end of the support frame 19 so as to be relatively rotatable.

  The seedling stage 14 is driven by a seedling lateral feed mechanism 25 (see FIG. 3) provided across the back side of the seedling stage 14 and the feed case 16 in conjunction with the seedling planting movement of the seedling planting mechanism 13. At the lower end of the mat-like seedling that is reciprocated in the horizontal direction and each seedling-planting mechanism 13 is placed on the seedling mounting table 14, the seedlings are sequentially transferred from the lateral one end side to the other end side of the mat-like seedling. The mat-like seedling is reciprocated in the traveling machine lateral direction with respect to the seedling planting mechanism 13 so as to be taken out.

  As shown in FIG. 3, the seedling horizontal feed mechanism 25 includes a feed case 16, a seedling horizontal feed shaft 27 that is rotatably supported by a support member 26 provided on the main frame 15, and a seedling horizontal feed shaft. 27 is provided with a base feed body 28 fitted on the outer peripheral side of the base 27 so as to be relatively rotatable and to be relatively slidable. The seedling horizontal feed shaft 27 is rotationally driven in conjunction with the seedling planting movement of the seedling planting mechanism 13 by the transmission device 20 accommodated in the feed case 16. The table feed body 28 is reciprocated along the seedling horizontal feed shaft 27 by a feed action of a reciprocating spiral groove provided on the outer peripheral surface of the seedling horizontal feed shaft 27, and a connecting member between the table feed body 28 and the seedling mounting table 14. The seedling stage 14 is traversely fed through.

  As shown in FIG. 2, a seedling vertical feed belt 14 b is provided on the lower end side of each seedling placing portion of the seedling placing table 14. The seedling vertical feed belt 14b of each seedling placement portion is a seedling vertical feed mechanism 30 (see FIG. 5) provided across the seedling stage 14 and the feed case 16 when the seedling stage 14 reaches the left and right stroke ends of the lateral transfer. 3), the mat-like seedlings that are rotationally driven by a predetermined stroke and are placed on the seedling placement part are only the length corresponding to the seedling removal length in the seedling placement vertical direction by the seedling placement mechanism 13. It feeds vertically toward the seedling planting mechanism 13.

  As shown in FIG. 3, the seedling vertical feed mechanism 30 includes a feed case 16, a longitudinal feed drive shaft 32 that is rotatably supported by a support member 31 provided on the main frame 15, and a seedling stage 14. And a passive arm 33 provided so as to be swingable. The longitudinal feed drive shaft 32 is rotationally driven by the transmission device 20 accommodated in the feed case 16 and always rotationally drives a pair of left and right transmission arms 34, 34 provided on the longitudinal feed drive shaft 32. When the seedling stage 14 reaches the right stroke end of the lateral transfer, the passive arm 33 comes into contact with the right transmission arm 34 and is driven by the transmission arm 34 by a set swing angle, and the driving force is fed to each seedling longitudinally. The belt 14b is wound around the belt driving wheel, and the belt driving wheel is driven to drive the seedling vertical feed belt 14b. When the seedling stage 14 reaches the left stroke end of the lateral transfer, the passive arm 33 comes into contact with the left transmission arm 34 and is driven by the transmission arm 34 by a set swing angle, and the driving force is fed to each seedling longitudinally. This is transmitted to the belt driving wheel of the belt 14b, and the belt driving wheel is driven to drive the seedling vertical feed belt 14b.

  Therefore, the working device 10 includes six seedling planting mechanisms 13 arranged at a predetermined interval in the lateral direction of the traveling machine body, and is driven by being lowered into the descending work state, thereby causing the six seedling planting mechanisms 13 to A seedling is planted in a portion of the field scene that has been leveled by sliding the grounding float 11.

  The work apparatus 10 is configured so that the grounding float 11 is grounded on the farm scene even if the traveling machine body tilts to the left or right depending on whether the front wheel 2 and the rear wheel 3 enter the recessed portion of the cultivator or climb on the convex portion of the cultivator. Since the feed case 16 rolls with respect to the link mechanism 7 and the planting frame F rolls with respect to the traveling machine body, the seedling planting depth by the left and right seedling planting mechanisms 13 is the same or substantially the same depth. To maintain.

The transmission device 20 will be described.
As shown in FIG. 4, the transmission device 20 is supported by the left and right lateral side wall portions 16 b of the feed case 16 so as to be relatively rotatable, and the rotational transmission shaft 42 through which the driving force of the input shaft 21 is transmitted by the bevel gear 40 and the bevel gear 41. It has.

  The transmission device 20 transmits the driving force of the rotary transmission shaft 42 from a transmission gear 43 provided at the end of the rotary transmission shaft 42 so as not to be relatively rotatable to a seedling planting mechanism 13 as a seedling working unit. The driving force of the transmission unit 20A and the rotation transmission shaft 42 is shifted by the working unit transmission 50, and the driving force after the shift is output from the output shaft 51 of the working unit transmission 50 (hereinafter referred to as the transmission output shaft 51). A seedling lateral feed mechanism 25 as a seedling supply working section and a seedling supply transmission section 20B that transmits to a seedling vertical feed mechanism 30 as a seedling supply working section are provided.

  The planting transmission portion 20A is engaged with a transmission gear 43 provided at the end of the rotation transmission shaft 42 so as not to be relatively rotatable, a relay transmission gear 44 engaged with the transmission gear 43, and the relay transmission gear 44. And an output shaft drive gear 45 connected to the output shaft 22 so as not to be relatively rotatable.

  The working part transmission device 50 includes a rotation transmission shaft 42, a machine body lateral transmission output shaft 51 supported above and to the left and right lateral wall portions 16b of the feed case 16 above the rotation transmission shaft 42, and a rotation transmission. The shaft 42 and the transmission output shaft 51 are mounted over the rotation transmission shaft 42 and the transmission output shaft 51 and four gear pairs 52 to 55 are arranged in the axial direction.

  One end side of the transmission output shaft 51 is supported by an output boss portion 16c projecting laterally outwardly on the lateral side wall portion 16b of the feed case 16 via a bearing member so as to be relatively rotatable. An end portion of the speed change output shaft 51 that protrudes from the output boss portion 16 c to the outside of the feed case is linked to the seedling horizontal feed shaft 27 so as not to be relatively rotatable. An output gear 56 is provided at the end of the speed change output shaft 51 opposite to the side connected to the seedling horizontal feed shaft 27 so as not to rotate relative to the vertical feed shaft drive gear 57 engaged with the output gear 56. Are coupled to the longitudinal feed drive shaft 32 in a relatively non-rotatable manner.

  Each of the four pairs of gears 52 to 55 is engaged with the input side transmission gears 52a to 55a supported so as to be relatively rotatable on the rotary transmission shaft 42, and the input side transmission gears 52a to 55a. And an output-side transmission gear that is supported by the transmission output shaft 51 so as not to be relatively rotatable.

  Each of the four pairs of gears 52 to 55 shifts the driving force of the rotation transmission shaft 42 by a transmission transmission ratio set by the transmission transmission gears 52a to 55a on the input side and the transmission transmission gear on the output side, thereby changing the transmission output shaft. 51. The outer diameters of the input side transmission gears 52a to 55a and the output side transmission gears in the four pairs of gears 52 to 55 are made different so that the transmission gear ratios of the four pairs of gears 52 to 55 are different. is there.

  That is, among the four gear pairs 52 to 55, the gear pair 52 adjacent to the transmission gear 43 becomes the first-speed gear pair, and the gear pair 53 adjacent to the first-speed gear pair 52 is the second-speed gear. It is a pair. An adjacent gear pair 54 on the side opposite to the side where the first-speed gear pair 52 is located with respect to the second-speed geared 53 becomes a third-speed gear pair, and the third-speed gear pair 54 The gear pair 55 adjacent on the opposite side to the side where the second-speed gear pair 53 is located is a fourth-speed gear pair.

  A shift key 61 is accommodated in a keyway 60 provided in the rotation transmission shaft 42 so as to be slidable in the axial direction of the rotation transmission shaft 42. When the shift key 61 is slid, the four input transmission gear transmission gears 52a to 55a can alternatively rotate integrally with the rotary transmission shaft 42 by an engaging projection 61a provided at one end of the shift key 61. It is comprised so that it may engage with.

  In other words, the passive recesses 58 are provided in the inner peripheral portions of the input side transmission gears 52a to 55a in the gear pairs 52 to 55, respectively. When the shift key 61 is slid and operated to the first-speed operation position, the engagement protrusion 61a enters the passive recess 58 of the transmission gear 52a on the input side of the first-speed gear pair 52 and engages. The protrusion 61a engages the input-side transmission gear 52a and the rotation transmission shaft 42 so that they cannot be rotated relative to each other. When the shift key 61 is operated to the operation position for the second speed, the engagement protrusion 61a enters the passive recess 58 of the transmission gear 53a on the input side of the gear pair 53 for the second speed, and the engagement protrusion 61a The transmission gear 53a on the input side and the rotary transmission shaft 42 are engaged so as not to be relatively rotatable. When the shift key 61 is operated to the operation position for the third speed, the engagement protrusion 61a enters the passive recess 58 of the transmission gear 54a on the input side of the gear pair 54 for the third speed, and the engagement protrusion 61a The input-side transmission gear 54a and the rotational transmission shaft 42 are engaged so as not to be relatively rotatable. When the shift key 61 is operated to the operation position for the fourth speed, the engagement protrusion 61a enters the passive recess 58 of the transmission gear 55a on the input side of the gear pair 55 for the fourth speed, and the engagement protrusion 61a The transmission gear 55a on the input side and the rotation transmission shaft 42 are engaged so as not to be relatively rotatable.

  A spring accommodating portion 62 is provided in a portion of the rotational transmission shaft 42 that is disengaged from the four input side transmission gears 52 a to 55 a, and the shift key 61 is connected to the input side by the sphere 63 and the spring 64 accommodated in the spring accommodating portion 62. The power transmission gears 52a to 55a are configured to be urged to be engaged.

  That is, four positioning recesses arranged in the sliding direction of the shift key 61 are provided in a portion of the shift key 61 opposite to the side where the engaging protrusion 61a is located. When the shift key 61 is operated from the first-speed operation position to the fourth-speed operation position, the sphere 63 enters the positioning recess portion corresponding to the operation position among the four positioning recess portions, and the spring 64 passes through the sphere 63. The shift key 61 is pressed. Since the sphere 63 acts between the engaging protrusion 61a of the shift key 61 and the portion where the shifter 65 is connected, the shift key 61 is in the state where the shifter 65 is used as a swing fulcrum. 61a is swung by a spring 64 on the side of the transmission gears 52a to 55a toward the passive recesses.

  As shown in FIGS. 4 and 5, the outer diameter D1 of the spring accommodating portion 62 in the rotation transmission shaft 42 is set larger than the outer diameter D2 of other portions. In other words, the spring accommodating portion 62 is provided with a spring accommodating space having a long radial length of the rotary transmission shaft 42, the spring 64 having a long free length is accommodated in the spring accommodating portion 62, and the shift key 61 is provided for each transmission gear. It is comprised so that it may be hold | maintained with the strong urging | biasing force in the engagement state with respect to 52a-55a.

  The spring accommodating portion 62 is configured to support and act on the side surface of the adjacent transmission gear 55a. Since the outer diameter D1 of the spring accommodating portion 62 is larger than the outer diameter D2 of other portions, the shape of the spring accommodating portion 62 as viewed in the direction along the axis of the rotation transmission shaft 42 is passive among the transmission gears 55a. A circular shape having a radius larger than the radius at the portion where the recessed portion 58 is located. Therefore, the area of the support surface of the spring accommodating portion 62 with respect to the transmission gear 55a can be increased, and the transmission gear 55a can be stably supported by the spring accommodating portion 62.

  The other end side of the shifter 65, one end side of which is connected to the shift key 61 so as not to be relatively slidable, is interlocked and connected to the end of the speed change operation shaft 66 facing the traveling machine body so as not to be relatively slidable. The speed change operation shaft 66 is supported by a support portion 67 provided on the lateral side wall portion 16 b of the feed case 16. The speed change operation shaft 66 penetrates the support portion 67 so as to be slidable. As shown in FIG. 3, the end portion of the speed change operation shaft 66 outside the feed case is interlocked and connected to a speed change lever 68 that is supported by the main frame 15 so as to be swingable.

  The support portion 67 includes an inner boss portion 67b projecting from the lateral side wall portion 16b toward the inner side of the feed case 16, and an outer boss portion projecting from the lateral side wall portion 16b toward the lateral outer side of the feed case 16. Part 67a. That is, the support portion 67 includes a long support span including a support span provided in the inner boss portion 67b and a support span provided in the outer boss portion 67a, so that the shift operation shaft 66 is not easily rattled by the long support span. Support stably.

  A protrusion length L1 projecting from the lateral side wall portion 16b of the boss portion 67a and a lateral side wall of the output boss portion 16c so that the boss portion 67a outside the feed case and the output boss portion 16c of the support portion 67 can be easily formed. The protruding length L2 protruding from the portion 16b is set to be the same. The projecting length L1 of the boss portion 67b and the projecting length L2 of the output boss portion 16c are slightly different due to manufacturing errors and the like. It is assumed that the projecting length L2 of the output boss portion 16c is the same.

  Therefore, the working unit transmission 50 is operated to shift into a four-stage shift state from the first speed to the fourth speed when the shift lever 68 is swung. In other words, when the shift lever 68 is swung, the shift operation shaft 66 is slid, the shift key 61 is slid through the shifter 65, and the shift key 61 selects the four input side transmission gears 52a to 55a. It is engaged with the rotary transmission shaft 42 so as to be integrally rotatable.

  When the gear shift operation is performed, the working unit transmission 50 shifts the driving force of the rotation transmission shaft 42 driven by the driving force from the input shaft 21 to the input side transmission engaged with the rotation transmission shaft 42 so as to be integrally rotatable. The gear pairs 52 to 55 including the transmission gears 52a to 55a are used for shifting, and the driving force after the shifting is transmitted from the shifting output shaft 51 to the seedling horizontal feed shaft 27, and the driving speed of the seedling horizontal feed shaft 27 is changed to change the seedling width. The lateral feed speed of the seedling stage 14 by the feed mechanism 25 is changed in four stages, and the seedling removal length in the lateral direction of the mat-like seedling by the seedling planting mechanism 13 is changed.

  When the gear shift operation is performed, the working unit transmission 50 transmits the driving force after the shift from the output gear 56 to the vertical feed shaft drive gear 57 to change the drive speed of the vertical feed drive shaft 32, and the seedling vertical feed mechanism 30. The seedling vertical feed belt 14b is driven at an appropriate timing that matches the timing at which the seedling stage 14 reaches the left and right stroke ends of the lateral transfer, regardless of the change in the lateral feed speed of the seedling stage 14, and , And a predetermined appropriate driving stroke.

A support structure for the rolling support shaft 17 and the input shaft 21 will be described.
FIG. 10 is a longitudinal side view showing a support structure for the rolling support shaft 17 and the input shaft 21. FIG. 13 is a perspective view showing the front portion of the feed case 16. As shown in FIGS. 10 and 12, the front boss 16 d of the feed case 16 has an input boss portion 70 facing the traveling vehicle body and a rolling boss portion 71 facing the traveling vehicle body, and the rolling boss portion 71 is an input boss portion. It is provided in an arrangement located above 70. The rolling boss portion 71 and the input boss portion 70 are integrally formed on the front wall portion 16 d when the feed case 16 is cast.

  The input boss portion 70 is formed in a cylindrical shape that is open toward the front of the traveling machine body and toward the rear of the traveling machine body. The rolling boss portion 71 includes a bottom wall portion 71a integrally formed at the end inside the feed case, and is formed in a cylindrical shape with a bottom that opens only in the forward direction of the traveling machine body. The outer diameter and inner diameter of the input boss portion 70 are set larger than the outer diameter and inner diameter of the rolling boss portion 71.

  Around the rolling boss portion 71, a connecting seat portion 72 having a connecting seat surface 72 a facing the front of the traveling machine body, and four bolt connecting portions 72 b of the connecting seat portions 72 are connected to the rolling boss portion 71. The main rib 73 is provided. Of the four main ribs 73, the two main ribs 73 located between the rolling boss part 71 and the input boss part 70 are connected across the rolling boss part 71 and the input boss part 70, and are arranged in the lateral direction of the traveling machine body. A pair of left and right reinforcing ribs 74 are provided. The distance between the pair of left and right reinforcing ribs 74 on the input boss part side is set wider than the distance on the rollin part boss part side.

  The rolling support shaft 17 includes a connection flange portion 17a formed integrally with the base portion, and a connection shaft portion 17b protruding rearward from the connection flange portion 17a. The rolling support shaft 17 is supported by the rolling boss portion 71 by connecting the connecting flange portion 17a to the connecting seat surface 72a with a connecting bolt 75 in a state where the connecting shaft portion 17b enters the rolling boss portion 71 from the front. Has been.

  The input shaft 21 passes through the input boss portion 70 in the longitudinal direction of the traveling machine body, and is provided at two locations between the input shaft 21 and the input boss portion 70, the front end portion and the rear end portion of the input boss portion 70. The bearing member 76 is supported by the input boss 70 so as to be relatively rotatable.

  Of the three working unit drive cases 12, the working unit drive case 12A supported by the main frame 15 below the feed case 16 is supported by the main frame 15 by the support structure shown in FIGS. It is configured.

  That is, the connecting flange portion 12f is integrally formed at the front end portion of the working portion drive case 12A. Bolt holes 12c are provided at two upper and lower portions on both the left and right ends of the connecting flange portion 12f, and a pair of left and right engaging portions 80 are provided at the upper end portion of the connecting flange portion 12f.

  The connecting flange portion 12f is positioned on the rear side of the main frame 15 with the pair of left and right engaging portions 80 engaged with the upper corners on the rear end side of the main frame 15, and connected to the bolt holes 12c from the rear. Bolts 81 and 82 are attached to the main frame 15 so as to penetrate from the rear to the front, and nuts 83 are attached to ends of the connection bolts 81 and 82 protruding forward from the main frame 15. The connecting flange portion 12 f is fastened and connected to the rear end surface B of the main frame 15 by the fastening force of the nut 82 and the nut 83.

  Of the upper and lower connecting bolts 81 and 82 at the left and right ends, the same bolt diameter is adopted as the lower connecting bolt 82 over the entire length. As the upper connecting bolt 81, a reamer bolt having a base-side bolt diameter larger than a tip-side bolt diameter is employed. The upper connecting bolt 81 is configured to be mounted based on the mounting procedure shown in FIG.

  That is, when the upper connecting bolt 81 is mounted, the difference in diameter between the bolt hole 12c hole diameter of the connecting flange portion 12f and the bolt diameter on the distal end side of the connecting bolt 81 is used to connect the connecting bolt 81 to the bolt hole 12c. The bolt hole 12c is mounted in an inclined state so that the head side of the connecting bolt 81 does not touch the boss portion 12d through which the output shaft 22 of the working unit drive case 12 passes. When the forward movement of the connection bolt 81 with respect to the connection flange portion 12f proceeds and the head side does not touch the boss portion 12d, the inclination of the connection bolt 81 with respect to the bolt hole 12c is released, so that the proximal end side of the large diameter is It can be mounted in the bolt hole 12c, and the connecting bolt 81 can be mounted so as not to play against the connecting flange portion 12f.

  The pair of left and right engaging portions 80 are configured such that the shape in a side view is a hook shape, and can be engaged and disengaged from the rear with respect to the upper corner portion on the rear end side of the main frame 15. As shown in FIGS. 6 and 14, the pair of left and right engaging portions 80 are engaged with the upper corner portion of the rear end side of the main frame 15, and the load of the working unit drive case 12 is applied to the main frame 15. It is configured to be supported and to slide in the lateral direction of the traveling machine body with respect to the main frame 15.

  When the working unit drive case 12 is attached to and detached from the main frame 15, the engaging bolt 80 is engaged with the main frame 15, so that the load of the working unit drive case 12 is supported by the main frame 15 and the connecting bolt 81. , 82 can be tightened and removed. Further, the working unit drive case 12 is slid laterally with respect to the main frame 15 in a state where the locking unit 80 is engaged with the main frame 15, so that the load of the working unit drive case 12 is reduced to the main frame 15. While being supported by the frame 15, the connecting flange portion 12 f can be aligned with the main frame 15.

  Of the three working unit drive cases 12, a support structure in which the working unit drive case 12B supported by the main frame 15 on the left lateral side and the right lateral side of the feed case 16 is supported by the main frame 15 is not illustrated. The working unit drive case 12B supported by the main frame 15 on the left lateral side and the right lateral side also has the same configuration as the support structure of the working unit drive case 12A supported by the main frame 15 below the feed case 16. The main frame 15 is configured to be supported by the provided support structure.

A support structure in which the feed case 16 is supported by the main frame 15 will be described.
As shown in FIGS. 6, 7, and 9, the main frame 15 is configured by a tubular body having a rectangular longitudinal cross-sectional shape and having three upper and lower hollow portions extending over the entire length. Connecting portions 90 are provided at the left and right lower portions on the front end side of the feed case 16, and the left and right connecting portions 90 are connected to the main frame 15 by connecting bolts 91 and 92.

  That is, pop nut mounting grooves 85 are provided in the front side portion and the rear side portion of the upper end surface U of the main frame 15 along the lateral direction of the traveling machine body.

  As shown in FIG. 7, the left connecting portion 90 of the feed case 16 includes a cast connecting seat portion 93 integrally formed with the feed case 16, and a connecting member 94 formed separately from the connecting seat portion 93. It has.

  As shown in FIGS. 7 and 8, the connecting seat 93 is configured to have a bifurcated shape when viewed from the side of the body, and is divided into a front portion and a rear portion of the upper end surface U of the main frame 15. A front seat portion 93F and a rear seat portion 93R are provided. The length FL in the front-rear direction of the front seat portion 93F is set to a length straddling the pop-nut mounting groove 85 located in the front portion of the upper end surface U in the front-rear direction. The length RL in the front-rear direction of the rear seat portion 93R is set to a length straddling the pop nut mounting groove 85 located in the rear portion of the upper end surface U in the front-rear direction. Bolt holes 95 in the vertical direction of the machine body are provided in the front seat portion 93F.

  That is, the pop nut 96 is attached to the pop nut attaching groove 85 in the front portion of the upper end surface U. That is, the retaining flange of the pop nut 96 is inserted into the pop nut mounting groove 85, and the main body of the pop nut 96 is accommodated in the hollow portion of the main frame 15. The connecting bolt 91 attached to the bolt hole 95 is attached to the pop nut 96 through the pop nut attachment groove 85. Then, the connecting seat portion 93 is in a state where the front seat portion 93F is placed on the upper end surface U across the front portion pop nut mounting groove 85 and the rear seat portion 93R is the rear portion pop nut mounting groove. In a state where it is placed on the upper end surface U across 85, the upper end surface U is tightened and connected by the tightening force of the connecting bolt 91 and the pop nut 96, and the connecting portion 90 is tightened and connected to the main frame 15.

  The upper end side of the connecting member 94 is connected to a support part 97 provided at the rear part of the rear seat part 93R by a connecting bolt 97a facing the traveling machine body. A connecting bolt 92 attached from the rear to the lower end side of the connecting member 94 is attached to the main frame 15 so as to penetrate from the rear to the front, and a nut 98 is attached to the end of the connecting bolt 92 protruding forward from the main frame 15. Wear. Then, the connecting member 94 is connected over the rear side seat portion 93R and the main frame 15, and is tightened and connected to the rear end surface B of the main frame 15 by the tightening force by the connecting bolt 92 and the nut 98, and the connecting portion 90 is connected to the main frame. Tighten to 15 and connect.

  As shown in FIGS. 11 and 14, when the working unit drive case 12 </ b> A below the feed case is slid horizontally with respect to the main frame 15 at the lower end portion of the support portion 97 in the rear seat portion 93 </ b> R, A notch portion is provided as a recessed portion 99 into which the left locking portion 80 of the portion 80 enters. In other words, when removing the working unit drive case 12A, the left locking unit 80 enters the recessed portion 99 by sliding the working unit drive case 12A along the main frame 15 in the left lateral direction. The working unit drive case 12A can be separated from the output case unit 16a of the feed case 16 by increasing the lateral movement stroke of the unit drive case 12A. In this case, the connecting member 94 is removed and the rear side of the recessed portion 99 is opened. That is, in normal times, the connecting member 94 is a lid that closes the rearward opening of the recessed portion 99.

  The connecting seat portion 93 is configured such that a gap 101 through which the electric wire 100 can pass is formed between the front seat portion 93F and the rear seat portion 93R, and the electric wire 100 passes through the gap 101 and the upper end surface side of the main frame 15. Is routed in such a way as to pass through the aircraft. The electric wire 100 is provided in each seedling placement portion of the seedling placement stand 14, and transmits information of a detection switch for detecting the remaining amount of seedlings in the seedling placement portion to a control device and an alarm device.

  The connecting seat portion 93 is configured such that the distance between the lower end side of the front seat portion 93F and the rear seat portion 93R is wider than the distance between the upper end side. Specifically, the side surface 101a that forms the gap 101 of the rear seat portion 93R is formed on a surface that is perpendicular to the upper end surface U of the main frame 15, and the side surface 101b that forms the gap 101 of the front seat portion 93F is the main frame. 15 is formed on an inclined surface with respect to the upper end surface U. That is, the shape of the gap 101 in a side view is a downward spreading shape that allows the electric wire 100 to pass therethrough.

  As shown in FIG. 9, the right connecting portion 90 of the feed case 16 includes a cast connecting seat portion 93 formed integrally with the feed case 16.

  The connecting seat portion 93 is configured to have a bifurcated shape when viewed from the side of the fuselage, and the front seat portion 93 </ b> F is placed separately on the front portion and the rear portion of the upper end surface U of the main frame 15. And a rear side seat portion 93R. The length in the front-rear direction of the front seat portion 93F is set to a length straddling the pop nut mounting groove 85 located in the front portion of the upper end surface U in the front-rear direction. Bolt holes 95 in the vertical direction of the machine body are provided in the front seat portion 93F. A tightening connecting portion 102 is integrally formed on the rear portion of the rear seat portion 93R.

  That is, the pop nut 96 is attached to the pop nut attaching groove 85 in the front portion of the upper end surface U. That is, the retaining flange of the pop nut 96 is inserted into the pop nut mounting groove 85, and the main body of the pop nut 96 is accommodated in the hollow portion of the main frame 15. The connecting bolt 91 attached to the bolt hole 95 is attached to the pop nut 96 through the pop nut attachment groove 85. Then, the connecting seat portion 93 is in a state where the front seat portion 93F is placed on the upper end surface U across the front portion pop nut mounting groove 85 and the rear seat portion 93R is at the rear end portion of the upper end surface U. In the mounted state, the connecting bolt 91 and the pop nut 96 are tightened and connected to the upper end surface U by the tightening force, and the connecting seat portion 93 is connected to the main frame 15.

  A connecting bolt 92 attached to the tightening connecting portion 102 is attached to the main frame 15 so as to penetrate from the rear to the front, and a nut 98 is attached to an end of the connecting bolt 92 protruding forward from the main frame 15. Then, the tightening connecting portion 102 is tightened and connected to the rear end surface B of the main frame 15 by the tightening force of the connecting bolt 92 and the nut 98, and the connecting seat portion 93 is tightened and connected to the main frame 15.

  The connecting seat portion 93 is configured such that a gap 101 through which the electric wire 100 can pass is formed between the front side seat portion 93F and the rear side seat portion 93R, and the electric wire 100 passes through the gap 101 and passes the upper side of the main frame 15 to the fuselage. Wiring is routed in the horizontal direction. The electric wire 100 is provided in each seedling placement portion of the seedling placement stand 14, and transmits information of a detection switch for detecting the remaining amount of seedlings in the seedling placement portion to a control device and an alarm device.

  The connecting seat portion 93 is configured such that the distance between the lower end side of the front seat portion 93F and the rear seat portion 93R is wider than the distance between the upper end side. Specifically, the side surface 101a forming the gap 101 of the rear seat portion 93R is formed on an inclined surface with respect to the upper end surface U of the main frame 15, and the side surface 101b forming the gap 101 of the front seat portion 93F is changed to the main frame. 15 is formed on a surface perpendicular to the upper end surface U. That is, the shape of the gap 101 in a side view is a downward spreading shape that allows the electric wire 100 to pass therethrough.

[Another Example]
(1) Although the example provided with the six seedling planting mechanisms 13 was shown in the above-described embodiment, it may be implemented with five or less or seven or more odd seedling planting mechanisms. Moreover, you may carry out by providing four or less or eight or more even number seedling planting mechanisms.

(2) In the above-described embodiment, the example in which the connecting member 94 is connected to the rear portion of the connecting seat portion 93 and the rear end surface B of the main frame 15 has been shown, but the front portion of the connecting seat portion 93 and the main frame 15 are shown. It may be configured to be connected to the front end surface of the.

(3) In the above-described embodiment, an example has been shown in which a working part transmission that can shift in four stages is employed as the working part transmission 50, but work that can be shifted in two, three, or more than five stages. A partial transmission may be employed.

(4) In the above-described embodiment, the example in which the protruding length L2 of the output boss portion 16c and the protruding length L1 of the boss portion 67b are set to be the same is shown. Also good.

  The present invention can be used for a working device provided with various working parts such as a fertilizing mechanism and a sowing mechanism in place of the seedling planting mechanism 13.

12A Working unit drive case below the feed case 12B Working unit drive case 13 Working unit (seedling planting mechanism)
15 Main frame 16 Feed case 16b Side wall portion 16c Output boss portion 20 Transmission device 25 Working portion (seedling lateral feed mechanism)
30 Working part (seedling vertical feed mechanism)
DESCRIPTION OF SYMBOLS 42 Rotation transmission shaft 50 Working part transmission 51 Output shaft 52a-55a Transmission transmission gear 60 Keyway 61 Shift key 62 Spring accommodating part 64 Spring 66 Transmission operation shaft 67a Boss part 80 Locking part 90 Connection part 92 Connection bolt 93 Connection seat part 94 connecting member 96 pop nut 97 support part 97a connecting bolt 99 recessed part B rear end face D1 outer diameter (spring accommodating part)
D2 Outer diameter (other parts)
L1 Protrusion length (boss part)
L2 protrusion length (output boss part)
U top surface

Claims (6)

The mainframe facing the aircraft,
A feed case supported by the main frame by being tightened and connected to the main frame;
A driving force from the traveling machine body is input, and a transmission device that outputs the input driving force to the working unit is accommodated in the feed case,
The connecting portion includes a connecting seat portion formed integrally with the feed case, and a connecting member formed as a separate member from the connecting seat portion,
The connecting seat is configured to be tightened and connected to the upper end surface of the main frame by a pop nut attached to the main frame,
The upper end side of the connecting member is configured to be tightened and connected to the connecting seat portion by a connecting bolt,
A working device configured to clamp and connect the lower end side of the connecting member to a front end surface or a rear end surface of the main frame by a connecting bolt facing the front and rear of the fuselage. The mainframe facing the aircraft,
A feed case supported by the main frame by being tightened and connected to the main frame;
A working unit drive case supported by a rear end surface of the main frame below the feed case;
A driving force from the traveling machine body is input, and a transmission device that outputs the input driving force to the working unit driving case is accommodated in the feed case,
The connecting portion includes a connecting seat portion formed integrally with the feed case, and a connecting member formed as a separate member from the connecting seat portion,
The connecting seat is configured to be tightened and connected to the upper end surface of the main frame by a pop nut attached to the main frame,
The upper end side of the connecting member is configured to be tightened and connected by a connecting bolt to a support portion provided at the rear portion of the connecting seat portion,
The lower end side of the connecting member is configured to be tightened and connected to the rear end surface of the main frame by a connecting bolt facing the front and rear of the fuselage,
The working unit drive case is provided with a locking part that can be engaged with and disengaged from the upper end of the main frame and can be slid laterally.
A working device in which the support portion is provided with a recessed portion into which the locking portion enters when the working portion drive case is slid laterally with respect to the feed case. Supported by the main frame on the lateral side of the feed case, and provided with a working unit drive case aligned with the working unit drive case below the feed case in the lateral direction of the machine body,
The working device according to claim 2, further comprising an even number of working parts that are supported by a working part driving case on a lateral side of the feed case and a working part driving case below the feed case and that are arranged in the lateral direction of the machine body. . The mainframe facing the aircraft,
A feed case supported by the main frame,
The working force transmission device that receives the driving force from the traveling machine body, shifts the inputted driving force and outputs it to the working portion is housed in the feed case,
A speed change operation shaft for speed change operation of the working unit transmission is provided so as to slide in the lateral direction of the fuselage on the side wall portion of the feed case,
A working device in which a boss portion that slidably supports the speed change operation shaft is provided on the lateral side wall portion so as to project laterally outward of the feed case. The output shaft of the working unit transmission is protruded from the lateral side wall in the same protruding direction as the shift operation shaft,
An output boss portion that supports the output shaft so as to be relatively rotatable is protruded laterally outward of the feed case on the lateral side wall portion,
The working device according to claim 4, wherein the protruding length of the output boss portion and the protruding length of the boss portion are set to be the same. The mainframe facing the aircraft,
A feed case supported by the main frame,
The working force transmission device that receives the driving force from the traveling machine body, shifts the inputted driving force and outputs it to the working portion is housed in the feed case,
The working unit transmission includes a plurality of transmission gears that are aligned in the axial direction of the rotation transmission shaft and are rotatably supported by the rotation transmission shaft, and a key groove provided in the rotation transmission shaft. A shift key that is accommodated so as to be slidable in the axial direction, and that is slidably operated to selectively engage the plurality of transmission gears with the rotation transmission shaft so as to be integrally rotatable,
A spring for biasing the shift key to engage with the plurality of transmission gears is accommodated in a spring accommodating portion provided on the rotation transmission shaft,
The working device in which the outer diameter of the spring accommodating portion in the rotation transmission shaft is set larger than the outer diameter of other portions.

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