JP4555278B2 - Management machine - Google Patents

Description

  The present invention relates to a management machine.

As a management machine, there are a main shift that is a shift operation of the traveling unit and a shift operation of a working unit such as a tilling unit that are performed by separate shift levers and a single shift lever.
Japanese Patent Laid-Open No. 5-16688

  By the way, in the management machine that performs the main shift operation and the work section shift operation with one shift lever, both shift operations can be performed with one hand, and therefore the operation is easy. However, since the installation position of the shift lever is limited to one, it is impossible to install one shift lever at a position suitable for any shift operation. On the other hand, in a management machine using two shift levers, each shift lever can be arranged at an appropriate position. However, since it is necessary to operate two shift levers, the operation tends to be complicated. For example, in a management machine, it is preferable to provide a check device that prevents the working unit from operating when the main shift lever is in the reverse drive position. However, when such a check device is operated, the operation becomes more complicated. Become.

  SUMMARY OF THE INVENTION The present invention has been made in view of such problems, and it is possible to easily perform a main shift operation and a work shift operation for a management machine that performs a main shift operation and a work unit shift operation by separate shift means. It is an object to provide what can be.

The present invention relates to a traveling unit used for moving the aircraft, a working unit for performing operations such as tillage, a prime mover that drives the traveling unit and the working unit, and power from the prime mover to the traveling unit. A transmission unit that includes a transmission gear unit and a work gear unit that transmits to the operation unit, a travel transmission operation tool for performing a shift of the travel gear unit, and a work shift for performing a shift of the work gear unit In a management machine comprising an operating tool, when the traveling speed change operating tool is moved to an operating position where the traveling unit is in a reverse operation state, the work is moved to an operating position where power transmission to the working unit is disconnected. Work mode switching means for moving the speed change operation tool is provided , and the traveling gear unit is switchable between a forward mode for transmitting forward power to the traveling unit and a reverse mode for transmitting reverse power, Gi The section can be switched between a forward rotation mode for transmitting forward rotation power to the working section, a work neutral mode for not transmitting power, and a reverse rotation mode for transmitting reverse rotation power. The operation gear can be switched between a forward operation zone where the forward gear mode is set to the forward mode and a reverse operation zone where the gear portion is set to the reverse mode. The operation mode switching means can be switched between a work neutral operation zone to be in a work neutral mode and a reverse operation zone to be in a reverse rotation mode, and the work mode switching means can be operated in a state in which the traveling speed change operation tool is moved to the reverse operation zone. The work speed change tool is moved so that the position of the work speed change tool is in the work neutral operation zone .
Further, the travel gear unit can be switched to a travel neutral mode in which no power is transmitted to the travel unit, and the travel speed change tool is a travel neutral operation zone in which the travel gear unit is in a travel neutral mode. The forward rotation operation zone and the reverse rotation operation zone of the work speed change operation tool are respectively a zone switchable area in which the switching operation to the work neutral operation zone is possible, and the zone switching operation is restricted. A zone switching restriction area, the work neutral operation zone of the work speed change tool is within a zone switchable area, and the work mode switching means moves the travel speed change tool to the travel neutral operation zone. The work shift operation tool may be moved so that the position of the work shift operation tool in the state where it is in the zone switchable region .

The present invention relates to a traveling unit used for moving the aircraft, a working unit for performing operations such as tillage, a prime mover that drives the traveling unit and the working unit, and power from the prime mover to the traveling unit. A transmission unit that includes a transmission gear unit and a work gear unit that transmits to the operation unit, a travel transmission operation tool for performing a shift of the travel gear unit, and a work shift for performing a shift of the work gear unit In a management machine comprising an operating tool, when the traveling speed change operating tool is moved to an operating position where the traveling unit is in a reverse operation state, the work is moved to an operating position where power transmission to the working unit is disconnected. Work mode switching means for moving the speed change operation tool is provided, and the traveling gear unit is switchable between a forward mode for transmitting forward power to the traveling unit and a reverse mode for transmitting reverse power, Gi The section can be switched between a forward rotation mode for transmitting forward rotation power to the working section, a work neutral mode for not transmitting power, and a reverse rotation mode for transmitting reverse rotation power. The operation gear can be switched between a forward operation zone where the forward gear mode is set to the forward mode and a reverse operation zone where the gear portion is set to the reverse mode. The operation mode switching means can be switched between a work neutral operation zone to be in a work neutral mode and a reverse operation zone to be in a reverse rotation mode, and the work mode switching means can be operated in a state in which the traveling speed change operation tool is moved to the reverse operation zone. The work speed change tool is moved so that the position of the work speed change tool is in a work neutral operation zone.
Further, the travel gear unit can be switched to a travel neutral mode in which no power is transmitted to the travel unit, and the travel speed change tool is a travel neutral operation zone in which the travel gear unit is in a travel neutral mode. The forward rotation operation zone and the reverse rotation operation zone of the work speed change operation tool are respectively a zone switchable area in which the switching operation to the work neutral operation zone is possible, and the zone switching operation is restricted. A zone switching restriction area, a work neutral operation zone of the work speed change operation tool is in a zone switchable area, and the work mode switching means includes the travel speed change operation tool positioned in the forward operation zone. A rule for moving the work speed change tool from the zone switching restriction area to the zone switchable area in conjunction with the switching operation to move toward the reverse operation zone. The work shift operation tool positioned in the zone switchable area is linked to a release mechanism and a switching operation for moving the travel shift operation tool positioned in the travel neutral operation zone toward the reverse operation zone. Ru and a mode switching mechanism for moving the operating zone.

  The work mode switching means may include a holding structure that holds the work speed change operation tool moved to the work neutral operation zone by the mode switching mechanism in the work neutral operation zone.

In the management machine of the present invention, when the travel speed change operation tool is moved to an operation position where the travel section is in a reverse operation state, the work speed change operation tool is placed at an operation position where power transmission to the work section is disconnected. Since the moving work mode switching means is provided, a so-called back restraining operation can be performed easily and reliably.
In addition, there is provided work mode switching means for moving the work shift operation tool so that the position of the work shift operation tool in the state where the travel shift operation tool is in the reverse operation zone becomes the work neutral operation zone. Sometimes it is possible to perform so-called back restraint that does not operate the working unit. In other words, when the operator operates the travel speed change operation tool in the reverse operation zone, the work speed change operation tool is automatically moved to the work neutral operation zone by the work mode switching means, and the work gear portion of the mission section is switched to the work neutral mode. Therefore, the working unit for performing work such as tillage is stopped. As described above, the management machine of the present invention includes the travel speed change operation tool and the work speed change operation tool. However, when the travel speed change operation tool is moved to the reverse operation zone, the work speed change operation tool is automatically neutralized. Since it is moved to the operation zone, a so-called back restraining operation can be performed easily and reliably.
Further, as the work mode switching means, work mode switching means for moving the work speed change tool so that the position of the work speed change tool in the state where the travel speed change tool is in the travel neutral operation zone is in the zone switchable region is used. May be. In a management machine in which such work mode switching means is used, when the operator operates the travel speed change tool in the travel neutral operation zone, the work speed change tool is automatically moved to the zone switchable area by the work mode switch means. Thus, the operation can be shifted. Therefore, after that, when the travel speed change operation tool is moved to the reverse operation zone, the work speed change operation tool can be automatically moved to the work neutral operation zone to stop the working part, so that the so-called back can be easily and reliably. Checking operation can be performed. In addition, when the travel speed change operation tool is operated to the travel neutral operation zone, the travel speed change operation tool is positioned in the forward operation zone if the work speed change operation tool is automatically moved to the zone switchable region. The work speed change operation tool can be positioned in the zone switching restriction region. In this way, if the work speed change operation tool can be positioned in the zone switching restriction area when the management machine moves forward, an error occurs when the work speed change operation tool is positioned in the forward rotation operation zone or the reverse rotation operation zone. Thus, it is possible to more reliably prevent the work shifting operation tool from being moved to the work neutral operation zone to stop the working unit and interrupt the work, thereby improving workability and operability.

In the management machine of the present invention, when the travel speed change operation tool is moved to an operation position where the travel section is in a reverse operation state, the work speed change operation tool is placed at an operation position where power transmission to the work section is disconnected. Since the moving work mode switching means is provided, a so-called back restraining operation can be performed easily and reliably.
In addition, there is provided work mode switching means for moving the work shift operation tool so that the position of the work shift operation tool in the state where the travel shift operation tool is in the reverse operation zone becomes the work neutral operation zone. Sometimes it is possible to perform so-called back restraint that does not operate the working unit. In other words, when the operator operates the travel speed change operation tool in the reverse operation zone, the work speed change operation tool is automatically moved to the work neutral operation zone by the work mode switching means, and the work gear portion of the mission section is switched to the work neutral mode. Therefore, the working unit for performing work such as tillage is stopped. As described above, the management machine of the present invention includes the travel speed change operation tool and the work speed change operation tool. However, when the travel speed change operation tool is moved to the reverse operation zone, the work speed change operation tool is automatically neutralized. Since it is moved to the operation zone, a so-called back restraining operation can be performed easily and reliably.
Further, the work mode switching means moves the work shift operation tool from within the zone switching restriction region to the zone switch in conjunction with a switching operation toward the reverse operation zone of the travel shift operation tool located in the forward operation zone. The work that is located in the zone changeable region in conjunction with a restriction release mechanism that moves into the possible region and a switching operation toward the reverse operation zone of the travel speed change operation tool that is located in the travel neutral operation zone. A mode switching mechanism for moving the speed change operation tool to the work neutral operation zone may be provided. In a management machine in which such work mode switching means is used, when the traveling speed change operation tool located in the forward operation zone is moved to the reverse operation zone, the work speed change operation tool is automatically linked to the zone. When moving from the switching restriction area to the zone switchable area and the travel speed change operation tool located in the travel neutral operation zone is moved to the reverse operation zone, it is located in the zone switchable area in conjunction with this. The work shift operation tool automatically moves to the work neutral operation zone. Therefore, a so-called back restraining operation can be performed easily and reliably. In addition, since the work speed change operation tool can be positioned in the zone switching restriction region when the travel speed change operation tool is positioned in the forward operation zone, the work speed change operation tool is set in the normal rotation operation zone as described above. Or, when working in the reverse operation zone, it is more reliably prevented that the work speed change tool is mistakenly moved to the work neutral operation zone and the work section is stopped, thereby improving workability and operability. improves.

  The work mode switching means may be provided with a holding structure for holding the work speed change tool moved to the work neutral operation zone by the mode switching mechanism in the work neutral operation zone. In a management machine in which such work mode switching means is used, the position of the work speed change operation tool can be held in the work neutral operation zone by the holding structure, and thereby a so-called back restraint state can be held. Therefore, it is more reliably prevented that the back restraint is canceled accidentally when the management machine is retreated, and workability and operability are improved.

  Hereinafter, a management machine according to an embodiment of the present invention will be described in detail with reference to the drawings. In addition, as for the figure used for description, some members are omitted and the structure is shown more clearly.

  As shown in FIG. 1, the management machine 1 includes a prime mover 2 disposed at a front position thereof, a mission unit 3 disposed at a lower position of the prime mover, and a traveling unit disposed at a lower front side of the mission unit 3. 4, a work unit 5 for performing work such as tillage disposed in the lower rear portion of the mission unit 3, an operation unit 6 disposed above the work unit 5, and a unit for operating the mission unit 3 This is a walking type management machine provided with a speed change operation unit 7.

  The prime mover 2 drives the traveling unit 4 and the working unit 5, and a gasoline engine is used in the management machine 1 of the present embodiment. Reference numeral “8” denotes a fuel tank attached above the prime mover 2.

  The mission unit 3 transmits power from the prime mover 2 to the traveling unit 4 and the working unit 5. The traveling gear unit 3 a that transmits power to the traveling unit 4 and a working gear unit that transmits the power to the working unit 5. 3b. Both the traveling gear portion 3a and the working gear portion 3b can change speeds, and the traveling gear portion 3a has a forward mode in which forward power is transmitted to the traveling portion 4, and a traveling neutral state in which power is not transmitted to the traveling portion 4. It is possible to switch between a mode and a reverse mode in which reverse power is transmitted to the traveling unit 4. Further, the work gear unit 3b can be switched between a normal rotation mode for transmitting the normal rotation power to the work unit 5, a work neutral mode for not transmitting the power, and a reverse rotation mode for transmitting the reverse rotation power.

  The traveling unit 4 is used for movement of the management machine 1 and includes wheels 4 a attached to left and right ends of an axle (not shown) that is rotated by power transmitted from the mission unit 3.

  The working unit 5 is a part for performing work such as tilling, and includes a tilling side output shaft 5 a that is rotated by power transmitted from the mission unit 3. A cylindrical rotary (not shown) having a plurality of tilling claws is detachably attached to the tilling side output shaft 5a, and the working unit 5 is for adjusting the tilling depth. An adjustment bar 5b is attached.

  The operation unit 6 is a plan view type handle attached to the upper part of the mission unit 3. This handle is provided with a pair of handle bars 6a extending in a state of being inclined rearward and upward, and a grip portion 6b for an operator to grip is provided at a rear end portion of each handle bar 6a.

  As shown in FIGS. 1 to 3, the speed change operation unit 7 includes a main speed change lever (running speed change operation tool) 10, a tillage speed change lever (work speed change operation tool) 20 provided in the mission unit 3, and a main speed change A rotating body 30 to which the lever 10 is attached, a main transmission index 40 having a main transmission guide groove 41 for guiding the operation direction of the main transmission lever 10, and a work transmission guide groove 51 for guiding the operation direction of the tillage transmission lever 20. A work shift index 50, a main shift shifter 60 for switching the mode of the traveling gear section 3a of the mission section 3, and a work shift shifter 70 for switching the mode of the work gear section 3b of the mission section 3. I have.

  The main transmission lever 10 is an operating means for operating the main transmission shifter 60 to change the speed of the traveling unit 4 (main transmission), and is attached to a rotating body 30 provided on the left side of the mission unit 3. .

  The rotating body 30 is pivotally supported by the mission unit 3 at a rotating body front portion 31 located on the front side in the traveling direction of the management machine 1. The rotating shaft of the rotating body 30 is a horizontal shaft 30 a extending in the vehicle width direction, and the rotating body 30 extends rearward from the rotating body front portion 31. The main transmission lever 10 is attached to the rotating body rear portion 32. Therefore, when the main transmission lever 10 is operated and moved upward, the rotating body 30 rotates upward, and when the main transmission lever 10 is moved downward, the rotating body 30 rotates downward.

  The main transmission lever 10 is attached to the rotating body 30 so as to be rotatable. A rotation shaft 30b of the main transmission lever 10 with respect to the rotation body 30 is orthogonal to the horizontal shaft 30a. The rotating body 30 is arranged so as to extend in the front-rear direction, and the main transmission lever 10 can be rotated in the left-right direction (the vehicle width direction of the management machine) with respect to the rotating body 30. Yes.

  As shown in FIGS. 2 and 3, the main transmission lever 10 is provided with a guide pin 11 that engages with the guide groove 41 of the main transmission index 40. That is, the movement of the main transmission lever 10 is regulated by the guide pin 11 and the guide groove 41 that guides the guide pin 11. The guide groove 41 of the main speed change index 40 includes a travel neutral operation zone 41a extending in the front-rear direction, a forward operation zone 41b extending in the vehicle width direction and connected to the front end of the travel neutral operation zone 41a, and a travel neutral operation zone. A reverse operation zone 41c is provided which extends to the rear end portion of 41a and extends in the vehicle width direction.

  When the guide pin 11 is positioned in the traveling neutral operation zone 41a, the main speed change lever 10 is also positioned in the traveling neutral operation zone, the traveling gear is in the traveling neutral mode, and the guide pin 11 is positioned in the forward operation zone 41b. The main transmission lever 10 is also located in the forward operation zone and the traveling gear portion is in the forward operation mode. When the guide pin 11 is located in the backward operation zone, the main transmission lever 10 is also located in the backward operation zone and the traveling gear. The part is in reverse mode. The main transmission lever 10 can move up and down when the guide pin 11 is positioned in the traveling neutral operation zone 41a, and can move left and right when the guide pin 11 is positioned in the forward operation zone 41b or the reverse operation zone 41c. It has become.

  A shift arm 13 having a shift groove 12 with which a main shift shift pin 62 provided on a main shift fork shaft 61 of a main shift shifter 60 described later is engaged is attached to the main shift lever 10.

  The main transmission shifter 60 includes a main transmission fork shaft 61 extending in the vehicle width direction, and a main transmission shift pin 62 attached to one end of the main transmission fork shaft 61. The main transmission fork shaft 61 is movable in the axial direction, and a main transmission fork 63 for switching the mode of the traveling gear portion 3a of the transmission unit 3 is attached to the main transmission fork shaft 61. Therefore, when the main transmission fork shaft 61 is moved in the axial direction, the mode of the traveling gear portion 3a can be switched by the main transmission fork 63 that moves integrally with the main transmission fork shaft 61.

  In the management machine 1 of this embodiment, the main transmission fork shaft 61 can be positioned at five positions in the axial direction. The main transmission fork shaft 61 is formed with five notches 61a (see FIG. 2), and the mission unit 3 is provided with positioning balls (not shown) that engage with the notches 61a. Therefore, the main transmission fork shaft 61 can be positioned at any one of the five positions by engaging any of the notches 61a with the ball. For example, when the main transmission fork shaft 61 is moved to the rightmost side (lower left side in FIG. 3), the traveling gear unit 3a is switched to the forward mode, and when moved to the leftmost side (upper right side in FIG. 3) The gear portion 3a is switched to the reverse mode, and when moved to an intermediate position, the traveling gear portion 3a is switched to the traveling neutral mode.

  The main transmission shift pin 62 extends in a direction orthogonal to the main transmission fork shaft 61 and engages with the shift groove 12 of the shift arm 13 of the main transmission lever 10. Therefore, when the main transmission lever 10 is rotated in the left-right direction with respect to the rotating body 30, the main transmission shift pin 62 is moved in the left-right direction, and the main transmission fork shaft 61 is moved in the axial direction. The mode of 3a can be switched. On the other hand, when the main transmission lever 10 is rotated in the vertical direction with respect to the transmission unit 3, the main transmission fork shaft 61 does not move because the movement of the main transmission lever 10 is not transmitted to the main transmission shift pin 62.

  The tilling speed change lever 20 is an operating means for operating the work speed change shifter 70 to change the speed of the work section 5, and a lever holder 21 (see FIG. 3) provided at the other end of the main speed change fork shaft 61. It is attached to the main speed change fork shaft 61 via. The lever holder 21 is rotatable about its axis with respect to the main transmission fork shaft 61, and the tilling transmission lever 20 is arranged in a state extending rearward from the lever holder 21. That is, the tillage transmission lever 61 is attached to the main transmission fork shaft 61 so as to be swingable in the vertical direction. The tillage transmission lever 20 is attached to the lever holder 21 so as to be swingable about an axis orthogonal to the main transmission fork shaft 61. Accordingly, the tillage transmission lever 20 extending rearward can swing in the vehicle width direction (left-right direction).

  The tilling speed change lever 20 is engaged with the guide groove 51 of the tilling speed change index 50. That is, the vertical rotation range and the horizontal rotation range of the tillage transmission lever 20 are limited by the guide groove 51 and can be swung within the limited range. The guide groove 51 of the tilling speed change index 50 has a reverse concave shape (reverse U shape) when viewed from the rear side of the management machine, and includes a lower step 50b having a protrusion 52 formed at the center and an upper step 50a having no protrusion. That is, the tillage transmission lever 20 can be moved up and down in the lower and upper stages.

  The lower stage 50 b is an area (zone switching restriction area) where the rotation of the tillage transmission lever 20 in the left-right direction is restricted by the protrusion 52. Therefore, the tillage transmission lever 20 moved to the lower position cannot rotate in the left-right direction. On the other hand, the upper stage 50a is an area where there is no protrusion (zone switching area), and the tillage transmission lever 20 can be freely rotated in the left-right direction.

  The vertical zone including the position of the protrusion 52 is a work neutral operation zone 53a. When the tillage transmission lever 20 is positioned above the protrusion 52, the power from the prime mover 2 is not transmitted to the working unit 5. Further, the vertical zone located on the left side of the protrusion 52 in FIG. 2 is a forward rotation operation zone 53b. When the tillage speed change lever 20 is positioned in this zone, the power from the prime mover 2 is transmitted to the working unit 5, The tillage side output shaft 5a of the part 5 rotates forward. The vertical zone located on the right side of the protrusion 52 is a reverse operation zone 53c. When the tillage speed change lever 20 is positioned in this zone, the power from the prime mover 2 is transmitted to the working unit 5, and the working unit 5 The side output shaft 5a reverses.

  Therefore, in a state where the tillage transmission lever 20 is positioned at the fixed forward rotation position in the lower left side (zone switching restriction area of the forward rotation operation zone), the working unit 5 is in the forward rotation state, and the tillage transmission lever 20 is operated to perform a shift operation ( That is, it is a state in which the left / right turning operation) is restricted. When the tillage transmission lever 20 is positioned at the movable forward rotation position on the upper left side (the zone switchable region of the forward operation zone), the working unit 5 is in the forward rotation state, and the tillage transmission lever 20 is operated in the speed change operation. Is possible. In addition, when the tilling speed change lever 20 is positioned at the work neutral position above the protrusion 52 (the center upper stage, that is, the zone changeable region of the work neutral operation zone), the working unit 5 is in a stopped state, and the tilling speed change lever 20 is Is a state in which a speed change operation is possible. In the state where the tilling speed change lever 20 is positioned at the movable reversing position which is the upper right stage (the zone changeable area of the reversing operation zone), the working unit 5 is in the reversing state, and the tilling speed changing lever 20 can be changed. It is a state. Further, when the tillage speed change lever 20 is positioned at the fixed reverse position which is the lower right stage (zone switching restriction area of the reverse operation zone), the working unit 5 is in the reverse rotation state, and the speed change operation of the tillage speed change lever 20 is restricted. It is in the state.

  The work transmission shifter 70 includes a work transmission fork shaft 71 extending in the vehicle width direction and a pair of engagement pins 72 attached to the other end of the work transmission fork shaft 71. The work speed change fork shaft 71 is movable in the axial direction, and a work speed change fork (not shown) for switching the mode of the work gear portion 3b of the transmission unit 3 is attached to the work speed change fork shaft 71. Therefore, when the work transmission fork shaft 71 is moved in the axial direction, the mode of the traveling gear portion 3b can be switched by the work transmission fork that moves integrally therewith.

  The pair of engagement pins 72 are arranged with the work speed change lever 20 interposed therebetween. Therefore, when the work speed change lever 20 is rotated in the left-right direction, one of the engagement pins 72 is pushed and the work speed change fork shaft 71 moves in the axial direction (left-right direction). The mode can be switched. On the other hand, even if the work speed change lever 20 is rotated in the vertical direction, the movement of the work speed change lever 20 is not transmitted to the engagement pin 72 and the work speed change fork shaft 71 does not move.

  And the management machine 1 of this embodiment is provided with the cultivation mode switching means to which the cultivation transmission lever 20 is moved in conjunction with the movement of the main transmission lever 10.

  More specifically, the tillage mode switching means includes a restriction release mechanism 81 for moving the tillage shift lever 20 from the lower stage to the upper stage, and the tillage shift lever moved to the upper stage in the left-right direction to rotate the protrusion 52. And a mode switching mechanism 91 for moving to the upper work neutral operation zone.

  As shown in FIGS. 3, 11, and 12, the restriction release mechanism 81 includes a convex portion 64 formed at the other end of the main transmission fork shaft 61, and a restriction release body 82 attached to the mission unit 3. It has. The convex portion 64 of the main transmission fork shaft 61 moves integrally in the left-right direction when the main transmission fork shaft 61 moves in the left-right direction (axial direction). The restriction release body 82 is attached so as to be rotatable about a horizontal axis extending in the vehicle width direction, and a contact piece 83 positioned on the movement path of the convex portion 64 of the main transmission fork shaft 61 and the tillage transmission lever 20. And a restriction release piece 84 for pushing the tillage transmission lever 20 upward. Further, when the restriction release body 82 rotates, the restriction release piece 84 moves up and down.

  In the state where the main transmission fork shaft 61 is located at the movement limit position on the right side in the vehicle width direction, the convex portion 64 is in a state of being separated from the contact piece 83 of the restriction release body 82. At this time, the restriction release piece 84 of the restriction release body 82 is located at the lower movement limit position and is separated from the tillage transmission lever 20. On the other hand, in a state where the main transmission fork shaft 61 is positioned at the movement limit position on the left side in the vehicle width direction, the convex portion 64 is in a state of contacting the contact piece 83 of the restriction release body 82. When the convex portion 64 comes into contact with the contact piece 83, the contact piece 83 is pushed backward (that is, the direction in which the restriction release piece 84 moves upward) by the convex portion 64. At this time, the restriction release piece 84 of the restriction release body 82 is located at the upward movement position. The restriction release piece 84 located at this position is in contact with the tillage transmission lever 20 to position the tillage transmission lever 20 at the upper stage 50a.

  The mode switching mechanism 91 includes a work transmission shift pin 73 (see FIG. 2) attached to one end of the tillage transmission fork shaft 71 and a mode switching groove 33 formed in the rotating body 30. The mode switching groove 33 is engaged. Further, the work shift shift pin 73 is integrally moved in the left-right direction when the work shift fork shaft 71 moves in the left-right direction (axial direction). The mode switching groove 33 is formed in the rear portion of the rotating body 30 and has a substantially triangular shape that tapers in the rear view.

  Therefore, in a state where the main transmission lever 10 is rotated upward, the rotating body 30 is rotated, the mode switching groove 33 is rotated upward, and the work transmission shift pin 73 is in contact with the bottom of the mode switching groove 33. become. In this state, the work shift shift pin 73 can move in the left-right direction (the axial direction of the work shift fork shaft), and the forward rotation position 73a shown at the left end in FIG. 13, the center work neutral position 73b, It can move to the reverse rotation position 73c at the right end. Therefore, the work speed change fork shaft 71 can be moved in the axial direction by rotating the tillage speed change lever 20 in the left-right direction so that the work speed change operation can be performed.

  On the other hand, when the main transmission lever 10 is rotated downward, the mode switching groove 33 is rotated downward, and the work transmission shift pin 73 comes into contact with the top of the mode switching groove 33. In this state, the work shift shift pin 73 is in contact with both the left and right inclined sides 33a and 33b of the mode switching groove 33, and is in a state of being located at the center work neutral position 73b. The work shift shift pin 73 is in a state where it cannot move in the left-right direction by the left and right inclined sides 33a, 33b. Therefore, it becomes impossible to rotate the tillage transmission lever 20 in the left-right direction.

  The shift operation in the management machine 1 will be described.

  As shown in FIG. 4, when the guide pin 11 of the main speed change lever 10 is positioned in the forward operation zone 41b (hereinafter referred to as the forward operation state), the work gear portion 3b is in the forward rotation mode, and the forward rotation power Is transmitted from the prime mover 2 to the traveling unit 4 via the mission unit 3, the traveling unit 4 is in the forward operation state.

  In the forward operation state, as shown in FIG. 13, the rotating body 30 is positioned at the upper rotating position, and the work shift shift pin 73 is positioned on the bottom side of the mode switching groove 33. That is, the work shift shift pin 73 engaged with the mode switching groove 33 is movable in the left-right direction. Therefore, the operation gear portion 3b of the transmission unit 3 can be shifted by performing an operation of rotating the tillage shift lever 20 in the left-right direction.

  In the forward operation state, as shown in FIG. 8, the shift arm 13 is located on the right side of the swing range, and the main shift shift pin 62 and the like that engage with the shift groove 12 of the shift arm 13. The shift shifter 60 is located on the right side in the movement range. At this time, the protrusion 64 at the other end of the main transmission fork shaft 61 is not in contact with the contact piece 83 of the restriction release body 82 (see FIG. 11). The restriction release piece 84 of the restriction release body 82 is located closer to the lower side in the vertical swing range and is not in contact with the tillage transmission lever 20.

  Accordingly, in this state, when the tillage speed change lever 20 is moved to the forward rotation operation zone 53b (see FIG. 2) and then released from the tillage speed change lever 20, the tillage speed change lever 20 is moved to the upper position by the restriction release piece 84. And is moved to the fixed forward rotation position, which is the lower stage of the forward rotation operation zone 53b, by the own weight of the tilling speed change lever 20. Then, after the tilling speed change lever 20 is moved to the reverse rotation operation zone 53c, when the hand is released from the tillage speed change lever 20, the tillage speed change lever 20 is rotated by its own weight in the reverse constant forward rotation position which is the lower stage of the reverse rotation operation zone 53c. Move to. However, even if the tilling speed change lever 20 is moved to the work neutral operation zone 53a and then released from the tilling speed change lever 20, the tilling speed change lever 20 does not move to the lower position. In other words, the work neutral operation zone 53a is provided with a protrusion 52, and the position of the tillage transmission lever 20 is held at the upper position by the protrusion 52.

  As described above, in the forward operation state, the position of the tillage transmission lever 20 moved to the forward operation zone or the reverse operation zone is held in the operation zone of the movement destination by the protrusion 52, and moved to another operation zone. Is prevented. Therefore, it is possible to prevent the forward rotation operation and the reverse rotation operation of the working unit 5 from being erroneously stopped while the management machine 1 is moving forward.

  As shown in FIG. 5, when the main transmission lever 10 is rotated to the right, the guide pin 11 of the main transmission lever 10 is positioned at the front end position of the traveling neutral operation zone 41a, and the power from the prime mover 2 travels. It will be in the state which is not transmitted to the part 4, and the traveling part 4 will be in a halt condition.

  At this time, since the rotating body 30 does not rotate, it remains in the state shown in FIG. Therefore, the operation gear portion 3b of the transmission unit 3 can be shifted by performing an operation of rotating the tillage shift lever 20 in the left-right direction.

  On the other hand, as shown in FIG. 9, the shift arm 13 swings leftward as the main transmission lever 10 moves, so that the main transmission shift pin 62 engaged with the shift groove 12 of the shift arm 13, The main transmission fork shaft 61 and its convex part 64 move to the left, and the convex part 64 abuts against the abutment piece 83 of the restriction release body 82 (see FIG. 12). Then, the contact portion 83 is pushed rearward, the restriction release body 82 rotates, and the restriction release piece 84 moves upward. At this time, if the tillage transmission lever 20 is positioned at the lower stage, the restriction release piece 84 contacts the tillage transmission lever 20 and moves the tillage transmission lever 20 to the upper stage position.

  Thus, in the management machine 1 of the present embodiment, when the main transmission lever 10 is positioned in the traveling neutral operation zone, the tillage transmission lever 20 is automatically positioned in the upper stage. Accordingly, even when the tillage speed change lever 20 is in the forward rotation operation zone or the reverse rotation operation zone, the tiller transmission lever 20 is maintained in the upper position and is maintained in a state in which it can be rotated in the left-right direction.

  Thereafter, as shown in FIG. 6, when the main speed change lever 10 is rotated downward, the guide pin 11 of the main speed change lever 10 moves from the front end position of the traveling neutral operation zone 41a to the rear end position. In addition, since the guide pin 11 is maintained in the state located in the traveling neutral operation zone 41a, the power from the prime mover 2 is not transmitted to the traveling unit 4, and the traveling unit 4 is still in a stopped state.

  On the other hand, the rotating body 30 rotates at this time, and the mode switching groove 33 formed in the rear portion of the rotating body 30 moves downward as shown in FIG. Since the mode switching groove 33 has a triangular shape that tapers toward the upper end, when the mode switching groove 33 moves downward, the left and right direction of the work shift shift pin 73 engaged with the mode switching groove 33 accordingly. The movable range of is gradually narrowed. At this time, the work shift shift pin 73 located at the forward rotation position 73a or the reverse rotation position 73c is pushed toward the work neutral position 73b by the left and right inclined sides 33a and 33b of the mode switching groove. As described above, in the state where the main transmission lever 10 is located in the traveling neutral operation zone 41a, the tillage transmission lever 20 is located in the upper stage and is capable of rotating in the left-right direction. The shift shift pin 73 is pushed by the inclined sides 33a and 33b and moves toward the work neutral position 73b. When the work shift shift pin 73 comes into contact with the upper end of the mode switching groove 33, the work shift shift pin 73 is located at the work neutral position 73b. If it will be in this state, the work gear part 3b will be in a work neutral mode, the power from the motor | power_engine 2 will not be transmitted to the work part 5, and the work part 5 will be in a halt condition.

  The work shifting pin 73 is sandwiched between the left and right inclined sides 33a and 33b, and is held at the work neutral position 73b by the both inclined sides 33a and 33b. That is, both the inclined sides 33a and 33b function as a holding structure that holds the work transmission lever 20 that has been moved to the work neutral operation zone by the mode switching mechanism in the work neutral operation zone.

  Thereafter, as shown in FIG. 7, when the main speed change lever 10 is rotated to the right, the guide pin 11 of the main speed change lever 10 is positioned at the left end position of the reverse operation zone 41c, and the work gear portion 3b is reversely rotated. The mode is set, and a reverse operation state in which reverse power is transmitted from the prime mover 2 to the traveling unit 4 is set. At this time, as shown in FIG. 10, the state in which the convex portion 64 of the main transmission fork shaft 61 is in contact with the contact piece 83 of the restriction release body 82 is maintained, and the tillage transmission lever 20 is controlled by the restriction release body 82. The release piece 84 keeps the state moved to the upper position. Further, since the rotating body 30 does not rotate, the state shown in FIG. 14 is maintained. That is, the work shift shift pin 73 is maintained in a state of being held at the work neutral position 73b by the left and right inclined sides 33a and 33b.

  Thus, in the management machine 1 of the present embodiment, when the traveling speed change lever 10 is moved to the reverse operation zone, the tillage speed change lever 20 is automatically moved to the work neutral operation zone in conjunction with the movement. Thus, a so-called back restraining operation can be performed easily and reliably. In addition, the position of the tillage shift control lever 20 can be held in the work neutral operation zone by the holding structure, so that a so-called back check state can be held. The release is surely prevented, and workability and operability can be improved.

It is a perspective view showing the management machine of a 1st embodiment concerning the present invention. It is a disassembled perspective view from upper left back which shows schematic structure of the speed change operation part of the mission part of the management machine shown by FIG. It is a disassembled perspective view from upper right front which shows schematic structure of the speed change operation part of the mission part of the management machine shown by FIG. It is a perspective view from the upper left rear for demonstrating operation | movement of the mission part shown by FIG. 2, and its transmission operation part. It is a perspective view from the upper left rear for demonstrating operation | movement of the mission part shown by FIG. 2, and its transmission operation part. It is a perspective view from the upper left rear for demonstrating operation | movement of the mission part shown by FIG. 2, and its transmission operation part. It is a perspective view from the upper left rear for demonstrating operation | movement of the mission part shown by FIG. 2, and its transmission operation part. It is a perspective view from upper right back for demonstrating operation | movement of a mission part and its gear shift operation part. It is a perspective view from upper right back for demonstrating operation | movement of a mission part and its gear shift operation part. It is a perspective view from upper right back for demonstrating operation | movement of a mission part and its gear shift operation part. It is a perspective view from the right side for demonstrating operation | movement of a mission part and its speed change operation part. It is a perspective view from the right side for demonstrating operation | movement of a mission part and its speed change operation part. It is a rear view for demonstrating operation | movement of a mission part and its speed change operation part. It is a rear view for demonstrating operation | movement of a mission part and its speed change operation part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Management machine 2 Prime mover 3 Mission part 4 Traveling part 5 Working part 6 Operation part 7 Shifting operation part 10 Main transmission lever (traveling shifting operation tool)
12 Shift groove 13 Shift arm 20 Tillage speed change lever (work speed change operation tool)
21 Lever holder 30 Rotating body 33 Mode switching groove 40 Main transmission index 41 Main transmission guide groove 50 Work transmission index 50a Upper stage (zone switching area)
50b Lower row (zone switching restriction area)
51 Work shift guide groove 53a Work neutral operation zone 53b Forward rotation operation zone 53c Reverse rotation operation zone 60 Main transmission shifter 61 Main transmission fork shaft 62 Main transmission fork pin 63 Main transmission fork 64 Convex portion 70 Work transmission shifter 71 Work transmission fork shaft 72 Joint pin 73 Work shift shift pin 81 Restriction release mechanism 82 Restriction release body 83 Contact piece 84 Restriction release piece 91 Mode switching mechanism

Claims (3)

A traveling unit used for moving the machine body, a working unit for performing work such as tillage, a prime mover that drives the traveling unit and the working unit, and a traveling gear unit that transmits power from the prime mover to the traveling unit And a transmission unit having a work gear unit for transmitting to the working unit, a traveling gear shifting tool for shifting the traveling gear unit, and a working gear shifting tool for shifting the working gear unit. In the management machine equipped,
Work mode switching means for moving the work speed change operation tool to an operation position where the transmission of power to the work part is cut off when the travel speed change tool is moved to an operation position where the travel part is in a reverse operation state. Prepared ,
The traveling gear unit can be switched between a forward mode for transmitting forward power to the traveling unit and a reverse mode for transmitting reverse power,
The working gear unit can be switched between a normal rotation mode for transmitting normal rotation power to the working unit, a work neutral mode for not transmitting power, and a reverse rotation mode for transmitting reverse power.
The travel speed changer can be switched between a forward operation zone in which the travel gear unit is in forward mode and a reverse operation zone in which the travel mode is in reverse mode,
The work speed change operation tool can be switched to a normal rotation operation zone in which the work gear unit is in a normal rotation mode, a work neutral operation zone in which a work neutral mode is set, and a reverse operation zone in which a reverse rotation mode is set.
The work mode switching means moves the work speed changer so that the position of the work speed changer in the state where the travel speed changer is moved to the reverse operation zone becomes the work neutral operation zone. ,
Further, the travel gear unit can be switched to a travel neutral mode in which no power is transmitted to the travel unit, and the travel speed change tool is a travel neutral operation zone in which the travel gear unit is in a travel neutral mode. Can also be switched,
The forward rotation operation zone and the reverse rotation operation zone of the work speed change operation tool each include a zone switchable area in which switching operation to the work neutral operation zone is possible and a zone switching restriction area in which zone switching operation is restricted. And
The work neutral operation zone of the work speed change operation tool is within a zone switchable region,
The work mode switching means moves the work shift operation tool so that the position of the work shift operation tool in the state where the travel shift operation tool is moved to the travel neutral operation zone is in the zone switchable region. tiller, characterized in that it. A traveling unit used for moving the machine body, a working unit for performing work such as tillage, a prime mover that drives the traveling unit and the working unit, and a traveling gear unit that transmits power from the prime mover to the traveling unit And a transmission unit having a work gear unit for transmitting to the working unit, a traveling gear shifting tool for shifting the traveling gear unit, and a working gear shifting tool for shifting the working gear unit. In the management machine equipped,
Work mode switching means for moving the work speed change operation tool to an operation position where the transmission of power to the work part is cut off when the travel speed change tool is moved to an operation position where the travel part is in a reverse operation state. Prepared,
The traveling gear unit can be switched between a forward mode for transmitting forward power to the traveling unit and a reverse mode for transmitting reverse power,
The working gear unit can be switched between a normal rotation mode for transmitting normal rotation power to the working unit, a work neutral mode for not transmitting power, and a reverse rotation mode for transmitting reverse power.
The travel speed changer can be switched between a forward operation zone in which the travel gear unit is in forward mode and a reverse operation zone in which the travel mode is in reverse mode,
The work speed change operation tool can be switched to a normal rotation operation zone in which the work gear unit is in a normal rotation mode, a work neutral operation zone in which a work neutral mode is set, and a reverse operation zone in which a reverse rotation mode is set.
The work mode switching means moves the work speed changer so that the position of the work speed changer in the state where the travel speed changer is moved to the reverse operation zone becomes the work neutral operation zone. ,
Further, the travel gear unit can be switched to a travel neutral mode in which no power is transmitted to the travel unit, and the travel speed change tool is a travel neutral operation zone in which the travel gear unit is in a travel neutral mode. Can also be switched,
The forward rotation operation zone and the reverse rotation operation zone of the work speed change operation tool each include a zone switchable area in which switching operation to the work neutral operation zone is possible and a zone switching restriction area in which zone switching operation is restricted. And
The work neutral operation zone of the work speed change operation tool is within a zone switchable region,
The work mode switching means is capable of switching the zone of the work shift operation tool from within the zone switching restriction area in conjunction with a switching operation for moving the travel shift operation tool located in the forward operation zone toward the reverse operation zone. A restriction release mechanism for moving the vehicle in the region, and the work shift located in the zone switchable region in conjunction with a switching operation for moving the travel gear operating tool positioned in the travel neutral operation zone toward the reverse operation zone. A management machine comprising a mode switching mechanism for moving an operating tool to the work neutral operation zone . The management machine according to claim 2, wherein the work mode switching means includes a holding structure that holds the work shift operation tool moved to the work neutral operation zone by the mode switching mechanism in the work neutral operation zone. .

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