JP5205334B2 - Walking type agricultural machine - Google Patents

Description

  The present invention relates to a walk-type farm work machine such as a tillage machine, and more particularly to a walk-type farm work machine provided with a power transmission device that can switch a transmission path to be output to an axle and a tilling shaft by operating an operation lever.

  2. Description of the Related Art Conventionally, there are some walk-type farm work machines such as a tiller provided with a power transmission device that can switch a transmission path to be output to an axle and a tiller shaft. This shifts a shift gear, which is slidable in the axial direction on the transmission shaft, by operating an operation lever connected by a shift arm, a shift rod, etc. The transmission path can be switched to a path that drives only the axle, a path that drives the axle and tilling shaft, a path that drives only the tilling axis, and a neutral state where neither the axle nor the tilling shaft is driven. (See Patent Document 1).

JP 2006-81519 A

  By the way, the walking type farm work machine may be moved in a state where the engine is stopped, for example, when taking it in and out of the hangar. However, in the case of the walking type agricultural machine as in Patent Document 1, even when the shift position is set to the neutral state, the gear that is rotated by the reverse input from the axle becomes a resistance, and the pushing load of the agricultural machine is There was a problem that became heavy.

  Therefore, an object of the present invention is to provide a walking type farm working machine capable of reducing the pushing load even when the engine is stopped.

According to the first aspect of the present invention (see, for example, FIGS. 1 to 4), a shift gear (34) is arranged so as to be slidable in the axial direction on the transmission shaft (35) when power from the engine (E) is input. Is moved by the operating lever (20), so that the transmission path for outputting to the axle (4) and the tilling shaft (5), the path for driving only the axle (4), the axle (4) and the tilling shaft ( 5) A power transmission device (30) capable of switching between a path for driving 5), a path for driving only the tilling shaft (5), and a neutral state in which neither the axle (4) nor the tilling shaft (5) is driven. In the walking-type agricultural machine (1) provided with
The power transmission device (30)
An intermediate shaft (38) disposed on the transmission path to the axle (4) and downstream of the transmission shaft (35);
An intermediate gear (41a) disposed so as to be slidable in the axial direction on the intermediate shaft (38),
The connection of the transmission path to the axle (4) is switched by moving the intermediate gear (41a).
It exists in the walk type farm work machine (1) characterized by this.

According to the second aspect of the present invention (see, for example, FIGS. 1 to 4), the shift gear (34) and the intermediate gear (41a) are operated by one operating lever (20).
It exists in the walk type farm work machine (1) of Claim 1.

  In addition, although the code | symbol in the said parenthesis is for contrast with drawing, this is for convenience for making an understanding of invention easy, and has no influence on the structure of a claim. It is not a thing.

  According to the first aspect of the present invention, the power transmission device has the intermediate gear for switching connection / disconnection of the transmission path to the axle on the downstream side of the transmission path with respect to the transmission shaft for switching the transmission path. During the movement, it is possible to prevent the gear on the upstream side of the transmission path from rotating with respect to the intermediate gear, and to reduce the pushing load when the engine is stopped.

  According to the second aspect of the present invention, since the shift gear and the intermediate gear can be operated by operating one operating lever, the pushing load when the engine is stopped can be reduced with a simple structure. Can do. Also, the operation for this can be simplified.

The side view which shows a walk type farm work machine. The top view which shows a walk type farm work machine. It is an expanded view which shows the inside of a mission case, (a) is an axle side, (b) is a tilling shaft side. The top view which shows a lever guide.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments according to the present invention will be described below with reference to FIGS.

  As shown in FIGS. 1 and 2, the working machine 1 as a walking type farm working machine includes a machine body 2 supported by a pair of left and right wheels 6 and 6, and a rotary device disposed at the front part of the wheels 6 and 6. 7 etc. are comprised.

  The airframe 2 has an engine E disposed at the upper center portion thereof and a transmission extending in the front-rear direction below the engine E and capable of transmitting the power of the engine E to a drive axle (axle) 4 and a tilling shaft 5 ( And a transmission case 3 for storing a power transmission device 30. A fuel tank 9 covered with a tank cover 8 is disposed in front of the engine E, and a muffler 10 is disposed behind the fuel tank 9. A recoil starter 24 is disposed on the right side of the engine E, and a belt cover 23 is disposed on the left side. A recoil rope 25 extends from the recoil starter 24, and a gripping portion 25a fixed to the distal end portion of the recoil rope 25 is engaged with an engagement portion 17b provided on the handle 17 described later. Has been placed.

  In the lower part of the engine E, the transmission case 3 pivotally supports a drive axle 4 that supports the wheels 6 and 6 so as to be rotationally driven, and extends forward from the drive axle 4. In this portion, a tilling shaft 5 that supports a rotating body on which a plurality of tilling claws (not shown) is mounted is rotatably supported. Further, the rotary device 7 is configured by mounting a plurality of tilling claws on the tilling shaft 5, and the tilling work on the field or the like can be performed by rotationally driving the tilling shaft 5. It is configured.

  A gauge wheel 14 is disposed at the front of the mission case 3 so as to face forward. Further, a plate 12 formed with a fan-like shape and provided with a guide groove 12a having a plurality of engaging portions is disposed at the front portion of the transmission case 3, and the gauge wheel 14 is integrated with the gauge wheel 14. Can be moved in the vertical direction by a lever 15 configured to be movable, and the vertical position can be adjusted by engaging the protrusion with any one of the plurality of engaging portions. It is configured. Thereby, the working machine 1 is configured so that the tilling depth can be adjusted by the gauge wheel 14.

  A handle frame 16 is fixed to the rear part of the transmission case 3 so as to extend rearwardly from the airframe 2, and the handle 17 is attached via a rotating part 18 disposed at the upper end of the handle frame 16. Further, it is arranged so as to extend to the rear upper side. The handle 17 is configured such that the operator can operate the traveling direction of the work machine 1 by gripping the upper end portion, and further, a clutch lever 17a is disposed in the vicinity of the upper end portion. When the upper end portion is gripped, the clutch is engaged by gripping the upper end portion together. An accelerator lever 27 is disposed in the vicinity of the right base end of the clutch lever 17a so that the operator can operate the accelerator lever 27 while holding the handle 17. Further, an engine stop switch 28 that is a push button type that is easy to operate even in an emergency is disposed in front of the accelerator lever 27. The rotating unit 18 is provided with an angle adjusting mechanism so that the height of the handle 17 can be adjusted according to the physique of the operator. The working machine 1 is made compact by rotating and folding, so that it can be easily transported.

  In the mission case 3, an operation lever 20 is disposed so as to extend above the rear part along the handle frame 16 and the handle 17. The operating lever 20 is provided with a detachable portion 20a at substantially the same height as the rotating portion 18, so that the handle 17 is not disturbed when the handle 17 is folded by transportation or the like as described above. It is comprised so that the front end side part can be removed in the removal | desorption part 20a. When the distal end portion of the operation lever 20 is removed, it can be stored in a portion along the right side surface of the handle frame 16 as indicated by a two-dot chain line in FIG.

  Further, a rotary cover 21 made of an iron plate is fixed to the transmission case 3 and is arranged so as to cover the rear part from the upper part of the rotary device 7. The mud splashed up by the rotary device 7 is caused by the engine E and the operation. It is configured so that it does not affect the person. Further, the rotary cover 21 is provided with a lifting handle 22 on which an operator can put a hand when the work implement 1 is transported.

  Next, the transmission (power transmission device) 30, which is a main part of the present invention, will be described with reference to FIGS. 3 (a) and 3 (b).

  As shown in FIGS. 3A and 3B, the transmission 30 includes an input shaft (transmission shaft) 35, a reverse rotation shaft 36, a travel drive shaft 37, a tillage drive shaft (intermediate shaft) 38, a main shifter, and the like. It has a shaft 32 and a sub-shifter shaft 42 and is configured to be able to transmit power from the engine E to the drive axle 4 and the tilling shaft 5.

  The input shaft 35 is connected to the pulley 31 to which power from the engine E is input via a belt (not shown) outside the transmission case 3, and the shift gear 34 is axially arranged inside the transmission case 3. It is slidable and arranged so as to rotate integrally with the input shaft 35. The shift gear 34 moves in the axial direction via the arm 33 by operating the main shifter shaft 32 connected to the operation lever 20, and can change the meshing state with each gear described later. In addition, it is configured to be able to switch to a neutral state that does not mesh with any of these gears.

  The reverse shaft 36 includes a gear 36a and a gear 36b that rotate together, the gear 36a can mesh with the shift gear 34, and the gear 36b is configured to mesh with a gear 37c described later.

  The travel drive shaft 37 includes a gear 37a and a gear 37b that are rotatably disposed with respect to the travel drive shaft 37, a gear 37c that is disposed so as to rotate integrally, and a gear 37d that is disposed so as to be rotatable. A gear 37e and a gear 37f arranged to rotate integrally are provided. The gear 37a and gear 37b, and the gear 37d and gear 37e are configured to be integrated with each other. Further, the gear 37a is engaged with a gear 38a described later, and the gear 37b is configured to be able to engage with the shift gear 34. The gear 37c is configured to mesh with the gear 36b and to mesh with the shift gear 34. Further, the gear 37d meshes with an output gear 45 that transmits power to the drive axle 4 via the differential gear device 46, and the gear 37e can mesh with a later-described gear (intermediate gear) 41a. It is configured. The gear 37f is configured to mesh with a gear 41b described later.

  The tillage drive shaft 38 includes a gear 38 a arranged so as to rotate integrally with the tillage drive shaft 38 and a drive sprocket 40 that transmits power to the driven sprocket 50 of the tillage shaft 5 via the chain 48. It has been. The gear 38a meshes with the gear 37a. Further, a sleeve 41 is disposed on the tillage drive shaft 38 so as to be freely rotatable. By operating a sub-shifter shaft 42 connected to the operation lever 20, an arm is operated on the sleeve 41. A gear 41a and a gear 41b that can move in the axial direction via 43 and switch the meshing state are provided. The gear 41a meshes with the gear 37e, and the gear 41b meshes with the gear 37f.

  The main shifter shaft 32 and the sub shifter shaft 42 are configured to be operated by the operation lever 20, and the operation lever 20 is configured to be guided by the lever guide 26. As shown in FIGS. 1 and 2, the lever guide 26 is fixedly disposed with respect to the handle frame 16, and as shown in FIG. 4, the operation lever 20 can be moved in the lateral direction. The guide groove 53 includes a groove 53a formed in this manner and a groove 53b branched from the groove 53a and formed in a bowl shape.

  In addition, the lever guide 26 is labeled “R (reverse), start (neutral), F (forward), tillage, in-situ tillage)” along the groove 53a, and further at the tip of the groove 53b. “N (move)” is displayed. The operation lever 20 is configured to switch the transmission state of the transmission 30 by operating to match these display positions.

  In the transmission 30 configured as described above, the engine E is started when the operation lever 20 is brought into the “start” position on the groove 53a of the lever guide 26, that is, in the neutral state. At this time, since the shift gear 34 is in a neutral state that does not mesh with any gear, the power transmitted from the engine E to the input shaft 35 is not transmitted to either the drive axle 4 or the tilling shaft 5. When the operation lever 20 is set to the positions of “R (reverse), start (neutral), F (forward), tillage, in situ tillage” along the groove 53a of the lever guide 26, the main shifter shaft 32 and The shift gear 34 is slid on the input shaft 35 via the arm 33, but the gears 41 a and 41 b of the sleeve 41 are not slid via the sub-shifter shaft 42 and the arm 43.

  When the operation lever 20 is operated to the “F (forward)” position, the shift gear 34 is slid to engage with the gear 37 c of the travel drive shaft 37. Therefore, the power from the engine E is transmitted to the travel drive shaft 37, and the power transmitted to the travel drive shaft 37 is transmitted to the sleeve 41 via the gear 37f and the gear 41b meshing with the gear 37f. The The power transmitted to the sleeve 41 is transmitted to a gear 37e rotatably arranged on the travel drive shaft 37 via a gear 41a, and further to an output gear via a gear 37d formed integrally with the gear 37e. 45 and transmitted to the drive axle 4 via the differential gear device 46.

  On the other hand, when the operation lever 20 is operated to the “R (reverse)” position, the shift gear 34 is slid so as to mesh with the gear 36 a of the reverse rotation shaft 36. For this reason, the power from the engine E is transmitted to the gear 37c of the traveling drive shaft 37 through the gear 36b formed integrally with the gear 36a in the reverse rotation from the forward time. Then, the power that has been rotated in the reverse direction to that during forward travel is transmitted to the drive axle 4 through the same transmission path as during forward travel.

  When the operation lever 20 is operated to the “cultivation” position, the shift gear 34 is slid so as to mesh with the gears 37 c and 37 b of the travel drive shaft 37. For this reason, the power from the engine E is transmitted to the drive axle 4 in the same way as when moving forward, and via the gear 37a that rotates integrally with the gear 37b, and the gear 38a of the tillage drive shaft 38 that meshes with the gear 37a. Is transmitted to the tillage drive shaft 38. The power transmitted to the tillage drive shaft 38 is transmitted from the drive sprocket 40 to the driven sprocket 50 via the chain 48, and to the left and right tillage shafts 5a and 5b via the pair of left and right differential gear devices 51a and 51b, respectively. Communicated.

  When the operation lever 20 is operated to the “in-situ tillage” position, the shift gear 34 is slid to engage with the gear 37 b of the travel drive shaft 37. For this reason, the power from the engine E is transmitted to the tilling shaft 5 through the same transmission path as when plowing, but the power is not transmitted to the drive axle 4. Accordingly, the work machine 1 can perform, for example, a plowing work in a hard field or intermittent plowing work while temporarily stopping the traveling of the machine body 2.

  Further, when the operation lever 20 is operated along the groove 53b branched from the groove 53a of the lever guide 26 and is set to the position of “N (movement)” at the tip portion of the groove 53b, the shift gear 34 is While being in a neutral state that does not mesh with the gear, the gears 41 a and 41 b are slid on the tillage drive shaft 38 via the sub-shifter shaft 42 and the arm 43. Then, the gear 41a engaged with the gear 37e is separated from the gear 37e. As a result, the transmission 30 is in a neutral state in which the transmission path to the drive axle 4 is cut.

  Further, when the control lever 20 is in the neutral state at the position “N (movement)” of the lever guide 26, it is on the transmission path to the drive axle 4 and is further cut off the transmission path downstream from the input shaft 35. The reverse input from the drive axle 4 when the work machine 1 is moved when the engine E is stopped is transmitted only to the gear 37e. Accordingly, when the neutral state at the “N (movement)” position of the lever guide 26 is not provided, the accompanying gear is compared with the case where the reverse input from the drive axle 4 is transmitted to the gear 37b. Therefore, it is possible to prevent the gear on the upstream side of the transmission path from being rotated with the gear 41a.

  As described above, in the work machine 1 according to the present invention, the transmission 30 includes the gear 41a that switches connection / disconnection of the transmission path to the drive axle 4 on the downstream side of the transmission path with respect to the input shaft 35 that switches the transmission path. Therefore, it is possible to prevent the gear on the upstream side of the transmission path from rotating along with the gear 41a during the movement when the engine E is stopped, and the pushing load when the engine E is stopped can be reduced.

  In addition, since the shift gear 34 and the gear 41a can be operated by operating one operating lever 20, the pushing load when the engine E is stopped can be reduced with a simple structure. Also, the operation for this can be simplified.

  In this embodiment, the main shifters 32 and 33 are disposed upstream of the axle transmission system that transmits the power to the drive axle 4 by sliding the gear 41a by the sub-shifters 42 and 43 to cut the mesh with the gear 37e. The power transmission is cut off at the downstream side of the axle transmission system separately from the neutral achieved by the above, but for example, by providing a clutch such as a dog (claw) clutch between the gear 37e and the gear 37d, You may comprise so that the power transmission of a transmission system can be cut | disconnected.

  That is, according to the present invention, in the axle transmission system between the input shaft 35 and the drive axle 4, by providing intermediate (second) neutral forming means such as the sub-shifters 42, 43 and the clutch, It is only necessary to achieve a push neutral that cuts power at a position close to the drive axle 4, and the intermediate neutral forming means is preferably closer to the drive axle 4, but is transmitted more than the first neutral forming means such as the main shifters 32 and 33. As long as it is downstream, it may be provided at any position in the axle transmission system.

  In addition, if the transmission path of the axle transmission system is viewed mainly from the time of reverse input from the drive axle 4, the transmission is cut by the intermediate neutral forming means on the upstream transmission side of the axle transmission system, and the push neutral is achieved. That is.

1 walk-type farm work machine (work machine)
4 axles (drive axles)
5 Tillage shaft 20 Operation lever 30 Power transmission device (transmission)
34 Shift gear 35 Transmission shaft (input shaft)
38 Intermediate shaft (cultivation drive shaft)
41a Intermediate gear (gear)
E engine

Claims (2)

A power transmission path that outputs power to the axle and the tilling shaft by moving a shift gear that is slidably arranged in the axial direction on the power transmission shaft by an operation lever when power from the engine is input, and a path that drives only the axle A walk-type agricultural machine equipped with a power transmission device capable of switching between a path for driving the axle and the tilling shaft, a path for driving only the tilling shaft, and a neutral state in which neither the axle nor the tilling shaft is driven. In
The power transmission device is
An intermediate shaft disposed on the transmission path to the axle and on the downstream side of the transmission path with respect to the transmission shaft;
An intermediate gear arranged to be slidable in the axial direction on the intermediate shaft,
By switching the connection / disconnection of the transmission path to the axle by moving the intermediate gear,
A walking type agricultural machine characterized by that. The shift gear and the intermediate gear are operated by one operation lever.
The walking type agricultural working machine according to claim 1.

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