JP2009060879A - Operation structure of combine harvester - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an operation structure having a simple structure, capable of making a reaping clutch device as a power-transmitted state and engaging a sub-transmission device with a low speed region by positioning a reaping clutch lever at an engaging position and also preventing that the reaping clutch device becomes a power-blocked state unintentionally in a reaping work condition. <P>SOLUTION: This operation structure of a combine is provided with that in the state of positioning the sub-transmission lever 22 at a high speed position H, by operating the reaping clutch lever 24 from a blocked position C to the engaging position E, the sub-transmission lever 22 rotates around a sub-transmission operation shaft 71 and is switched from the high speed position H to the low speed position L by a linking mechanism 73 for operation-linking the reaping clutch lever 24 with the sub-transmission lever 22. On the one hand, in the state that the sub-transmission lever 22 is positioned at the low speed position L and also the reaping clutch lever 24 is positioned at the engaging position E, the sub-transmission lever 22 is regulated so as not to be transferred from the low speed position L to the high speed position H by a linking mechanism 73. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an operation structure applied to a combine in which a main transmission and a sub-transmission are inserted in a traveling system transmission path and a cutting clutch apparatus is inserted in a cutting system transmission path.

If the harvesting clutch device is in the power transmission state while the auxiliary transmission is engaged in the high speed range (movement speed range), the harvesting device will not be able to handle the harvesting amount proportional to the traveling speed of the combine. A clogging phenomenon occurs in the apparatus.
In order to prevent such inconvenience, various operation structures are proposed in which a sub-transmission lever for operating the sub-transmission device and a mowing clutch lever for operating the mowing clutch device are operatively connected via a link mechanism. (See Patent Documents 1 and 2 below).

  In the operation structure described in Patent Document 1 below, when the auxiliary transmission lever is positioned at a low speed position (an operation position for engaging the auxiliary transmission device in a low speed range), the cutting clutch lever is engaged (cutting position). The sub-transmission lever can be operated at either a high-speed position (the sub-transmission device is in a high-speed range) while being able to be operated at any of the clutch position (operation position for bringing the power transmission state) and the disengagement position (operation position for bringing the cutting clutch device into the power cut-off state). When the reaping clutch lever is operated from the disengagement position to the engagement position while being moved to the engagement position, the sub transmission lever is moved from the high speed position to the low speed position, and the sub transmission lever is When the auxiliary transmission lever is operated from the low speed position to the high speed position with the cutting clutch lever in the engaged position, the cutting clutch lever is operated. Over the to move from the engaging position to the blocking position, it is provided with the auxiliary transmission lever and the cutting link mechanism is operatively connected to the clutch lever.

  The operation structure described in Patent Document 1 can prevent the reaping clutch device from being in a power transmission state in a state where the auxiliary transmission is engaged in a high speed range, and at the time of reaping operation start operation, This is useful in that the sub-transmission device can be engaged in the low-speed region without operating the sub-transmission lever by operating the mowing clutch lever from the shut-off position to the engagement position. Has inconvenience.

In other words, in the operation structure described in Patent Document 1, the auxiliary transmission lever is not intended for any reason in the cutting operation state in which the auxiliary transmission lever is positioned at the low speed position and the cutting clutch lever is positioned at the engagement position. On the other hand, when entering from the low speed position to the high speed position, the reaping clutch lever automatically moves to the disengagement position, and the reaping clutch device enters a power disengagement state.
When such a situation occurs, the combine travels on the uncut grain cocoon in a state where the reaping device is stopped, and the uncut grain culm is stepped over by the combine.
In addition, a clogging phenomenon of the harvested cereal meal occurs in the harvesting device.

  On the other hand, in the operation structure described in Patent Document 2 below, when the auxiliary transmission lever is positioned at the high speed position, the cutting clutch is caused by the contact portion of the first check member and the first restriction protrusion of the second check member. When the lever is not allowed to move from the blocking position to the engaging position, and when the reaping clutch lever is positioned at the engaging position, the contact portion and the second restricting projection of the second check member cause the A link mechanism is provided in which the auxiliary transmission lever and the cutting clutch lever are operatively connected so as to disable the movement of the auxiliary transmission lever from the low speed position to the high speed position.

In the operation structure described in Patent Document 2, in the cutting operation state in which the auxiliary transmission lever is located at the low speed position and the cutting clutch lever is located at the engagement position, the auxiliary transmission lever is moved from the low speed position to the high speed position. Therefore, the inconvenience as in the operation structure described in Patent Document 1 does not occur.
However, when starting the harvesting operation, two operations are required: an operation for positioning the auxiliary transmission lever at the low speed position and an operation for positioning the harvesting clutch lever at the engagement position.
Japanese Utility Model Publication No. 51-88540 Japanese Utility Model Publication No. 61-3310

  The present invention has been made in view of the prior art, and an operation structure capable of preventing the reaping clutch device from entering a power transmission state in a state where the auxiliary transmission is engaged in a high speed range (operating travel range). In this case, at the start of the cutting operation, the cutting clutch device can be brought into the power transmission state and the sub-transmission device can be engaged in the low speed region with one action of positioning the cutting clutch lever at the engaging position. An object of the present invention is to provide a simple operation structure that can prevent the mowing clutch device from unexpectedly entering the power cut-off state.

  The operation structure according to the present invention has been made to solve the above-described problems, and the main transmission and the traveling transmission range by the main transmission are arranged at a high speed region or a low speed on a traveling system transmission path from the drive source to the traveling device. And a sub-transmission device that switches to a region, and a harvesting clutch device that selectively engages or shuts off power transmission in a harvesting system transmission path from the drive source to the harvesting device. A sub-transmission lever capable of taking a high-speed position in which the sub-transmission device is in a high-speed range and a low-speed position in which the sub-transmission device is in a low speed range around a sub-transmission operation shaft according to human operation, Depending on the operation, an engaging position where the cutting clutch device is in a power transmission state and a blocking position where the cutting clutch device is in a power cutoff state can be taken around the cutting clutch operation shaft parallel to the auxiliary transmission operation shaft. A reaping clutch lever; and a link mechanism for operatively connecting the sub-shifting lever and the reaping clutch lever, wherein the linking clutch lever is in a shut-off position when the sub-transmission lever is located at a high speed position. The sub-shift lever is moved from the high-speed position to the low-speed position, the sub-shift lever is positioned at the low-speed position, and the cutting clutch lever is positioned at the engagement position. In the present invention, the auxiliary transmission lever is configured to be unable to move from a low speed position to a high speed position.

According to the operation structure having the above-described configuration, when performing the cutting operation from the non-working state (when traveling on the road, etc.) in which the auxiliary transmission is in the high speed range due to the auxiliary transmission lever being positioned at the high speed position, the cutting clutch lever Is operated from the shut-off position to the engaging position, the cutting clutch lever is rotated about the cutting clutch operating shaft, the cutting clutch device is in a power transmission state, and the cutting clutch lever and the auxiliary transmission lever are operatively connected. By the link mechanism, the sub-transmission lever rotates around the sub-transmission operation shaft and is switched from the high speed position to the low speed position, so that the sub transmission is in the low speed range.
On the other hand, during the cutting operation in which the auxiliary transmission lever is in the low speed position and the cutting clutch lever is in the engagement position, the link mechanism restricts the auxiliary transmission lever from moving from the low speed position to the high speed position. .

  In this way, the link mechanism that operatively connects the sub-transmission lever and the mowing clutch lever enables the mowing clutch device to be in a power transmission state with one action of positioning the mowing clutch lever at the engaging position at the start of the mowing operation and While the transmission can be engaged in the low speed range, in the cutting operation state, the auxiliary transmission lever is restricted from moving from the low speed position to the high speed position by the link mechanism. It is possible to prevent the power from being cut off.

  Preferably, the auxiliary transmission lever takes a low speed position and a high speed position when operated in a first direction and a second direction around the auxiliary transmission operation shaft, respectively, and the cutting clutch lever is arranged around the cutting clutch operation shaft. When operated in the same direction as the first direction, it is positioned at the engaged position, and when operated in the same direction as the second direction, it is positioned at the cutoff position, and the engagement position and the cutoff position by the cutting clutch lever biasing member. At the time of being positioned in the first direction and the second direction around the cutting clutch operating shaft. The link mechanism includes a first link member having a base end portion connected to the cutting clutch lever so as to be rotatable about a pivot shaft parallel to the cutting clutch operation shaft and having a long hole formed at the tip end portion; And a second link member connected to the auxiliary transmission lever and provided with an engaging portion to be engaged with the elongated hole at the distal end portion. The long hole has a proximity end and a separation end on the side close to and apart from the pivot shaft, and an intermediate portion communicating between the proximity end and the separation end. Yes. In a state where the reaping clutch lever is located at the shut-off position, the engaging portion is first around the auxiliary transmission operation shaft in the elongated hole in response to an artificial operation to the high speed position and the low speed position of the auxiliary transmission lever. And movable in both the second direction. When the reaping clutch lever is manually operated from the shut-off position to the engaging position with the auxiliary transmission lever positioned at the high speed position, the separating end engages with the engaging portion and the engaging portion The first link member is interlocked with the cutting clutch lever so that the auxiliary transmission lever is positioned at a low speed position by rotating the auxiliary transmission operation shaft in the first direction. Rotate in one direction. When the auxiliary transmission lever is manually operated in the second direction around the auxiliary transmission operation shaft in a state where the auxiliary transmission lever is located at the low speed position and the cutting clutch lever is located at the engagement position, the second link member and The direction of the artificial operation force acting on the harvesting clutch lever via the first link member is located in the direction from the axis of the pivot shaft toward the axis of the harvesting clutch operation shaft, or in the engagement position. The cutting clutch lever is pushed in the first direction around the cutting clutch operating shaft.

In this case, the link mechanism has a first link member and a second link member. The first link member has a base end portion connected to the cutting clutch lever so as to be rotatable about a pivot shaft parallel to the cutting clutch operating shaft, and has a long hole formed at a tip portion thereof. A base end portion is connected to the auxiliary transmission lever, and an engagement portion that is engaged with the elongated hole is formed at the distal end portion.
Here, when the mowing clutch lever is located at the disengagement position, the engaging portion of the second link member is moved to the first link based on the operation in the first direction and the second direction around the auxiliary transmission operation shaft of the auxiliary transmission lever. Within the long hole of the member, it is possible to move in both the first direction and the second direction around the auxiliary transmission operation shaft. Accordingly, the auxiliary transmission lever can be operated in the first direction and the second direction around the auxiliary transmission operation shaft to be positioned at the low speed position and the high speed position.
In addition, when the cutting clutch lever is manually operated from the shut-off position to the engaging position with the auxiliary transmission lever positioned at the high speed position, the first link member is linked to the cutting clutch lever in the first direction around the cutting clutch operating shaft. By turning to the second link member, the separated end on the side separated from the pivot shaft of the long hole of the first link member and the engaging portion of the second link member are engaged. Rotates in the first direction around the auxiliary speed change operation shaft to position the auxiliary speed change lever at the low speed position.
Further, when the auxiliary transmission lever is in the low speed position and the cutting clutch lever is in the engaged position, when the auxiliary transmission lever is manually operated in the second direction around the auxiliary transmission operation shaft, the second link member and The direction of the manipulating force acting on the cutting clutch lever via the first link member is the direction from the axis of the pivot shaft to the axis of the cutting clutch operating shaft, or the cutting clutch lever located at the engaging position is the cutting clutch. It is a direction to push in the first direction around the operation axis. Thus, even if the auxiliary transmission lever is artificially operated in the second direction around the auxiliary transmission operation shaft in a state where the cutting clutch lever is in the engaged position, the auxiliary transmission lever cannot be positioned at the high speed position.
By configuring the link mechanism as described above, the cutting clutch lever and the auxiliary gearshift lever are interlocked with each other at the start of the cutting operation, while the cutting clutch lever is engaged in the cutting operation state. The sub-shift lever can be restricted from moving from the low speed position to the high speed position while being in the position.

  Preferably, the auxiliary transmission operation shaft and the cutting clutch operation shaft are juxtaposed in the vehicle front-rear direction along the vehicle width direction. The sub-transmission lever includes a base end portion supported by the sub-transmission operation shaft, a sub-transmission side grip portion extending upward from the base end portion, and the cutting clutch operation shaft with respect to the vehicle longitudinal direction from the base end portion. Is an auxiliary transmission side arm portion extending to the opposite side, and the base end portion of the second link member is connected so that the engaging portion of the second link member is positioned below the auxiliary transmission operation shaft. And an auxiliary transmission arm portion. The reaping clutch lever includes a base end portion supported by the reaping clutch operation shaft, a reaping clutch side grip portion extending upward from the base end portion, and the auxiliary clutch lever with respect to the longitudinal direction of the vehicle with respect to the reaping clutch operation shaft. There is a cutting clutch side arm portion connected to the cutting clutch side grip portion so as to be located on the opposite side to the speed change operation shaft. The first link member is a first portion extending in the vehicle front-rear direction, the first portion having the elongated hole formed along the vehicle front-rear direction on the side close to the auxiliary transmission operation shaft, A second portion extending upward from an end portion on the side close to the reaping clutch operation shaft and extending away from the auxiliary transmission operation shaft, and an end portion on the side separated from the auxiliary transmission operation shaft Has a second portion connected to the reaping clutch side arm portion so as to be rotatable about the pivot shaft. An end portion of the second portion that is separated from the auxiliary transmission operation shaft is positioned below the reaping clutch operation shaft when the reaping clutch lever is located at the cutoff position, and the reaping clutch lever Is positioned above the reaping clutch operating shaft.

  Preferably, the auxiliary transmission lever and the cutting clutch lever are arranged in parallel in a front-rear direction on a side column provided on the left side with respect to the forward direction of the combine from the driver's seat of the combine, and operate the main transmission. The main transmission lever is disposed on a front column provided in front of the driver seat.

  In this case, since the auxiliary transmission lever and the mowing clutch lever are arranged in parallel in the front and rear in the side column provided on the left side of the driver's seat, the front view of the worker seated in the driver's seat can be ensured satisfactorily, Since the main transmission lever is arranged on the front column provided in front of the driver's seat separately from the auxiliary transmission lever and the cutting clutch lever, it is possible to concentrate on the operation of the main transmission lever that is frequently used during work.

  According to the operation structure of the present invention, the link mechanism that operatively connects the sub-transmission lever and the reaping clutch lever allows the reaping clutch device to be moved with one action to position the reaping clutch lever at the engaging position at the start of the reaping operation. While the power transmission state can be established and the sub-transmission device can be engaged in the low speed range, in the cutting operation state, the sub-transmission lever is restricted from moving from the low speed position to the high speed position by the link mechanism. It is possible to prevent the device from entering a power cut-off state unexpectedly.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.
1 to 3 are a left side view, a top view, and a transmission schematic diagram of a combine 1 to which an operation structure according to an embodiment of the present invention is applied, respectively.

  As shown in FIGS. 1 to 3, the combine 1 in the present embodiment includes a traveling machine body 2, an engine 9 that is a drive source supported by the traveling machine body 2, and a pair of left and right coupled to the traveling machine body 2. A traveling device (in this embodiment, a crawler traveling device) 10, a traveling transmission 100 that changes the rotational power from the engine 9 and outputs it to the pair of traveling devices 10, and the front of the traveling machine body 2 The reaping device 30 supported by the traveling machine body 2 so as to be movable up and down, the feed chain device 20 that conveys the grain harvested by the reaping device 30 to the left side of the traveling machine body 2, and the feed chain device The threshing device 40 disposed on the left part of the traveling machine body 2 so as to perform the threshing process on the cereals conveyed by the A swing sorting device 50 disposed in the direction, a driver's seat 5 disposed in the right front portion of the traveling machine body 2, and a grain tank 6 that stores the grains sorted by the swing sorting device 50. A grain tank 6 disposed behind the driver's seat 5 and a waste transporting device 60 that inherits the drained waste from the feed chain device 20 and transports the waste backward. Yes.

First, the transmission structure in the combine 1 will be described.
As shown in FIG. 3, the transmission structure of the combine 1 has a traveling transmission 100 inserted in a traveling transmission path from the engine 9 to the traveling device 10, and constant speed rotational power from the engine 9. And a work system transmission mechanism 200 that outputs constant speed rotational power to the threshing device 30, the threshing device 40, the feed chain device 20, the swing sorting device 50, and the transport device 60.

  The traveling transmission 100 includes an HST 120 that is a main transmission to which constant speed rotational power of the engine 9 is input from an HST input shaft 121 that is operatively connected to the engine 9, and a traveling shift range by the HST 120 is set to a high speed range or a low speed range. And an output of the sub-transmission device 130 is transmitted to a travel system output shaft 55 that is a drive shaft of the travel device 10.

The auxiliary transmission 130 includes a motor-side output adjusting member that changes the suction / discharge amount of the hydraulic motor body in the HST, in addition to the mechanical multi-stage transmission.
In this case, the pump-side output adjusting member that changes the suction / discharge amount of the hydraulic pump body in the HST acts as the main transmission.

The working system transmission mechanism 200 is operatively connected to a constant speed output shaft 220 of the engine 9 via a threshing clutch mechanism 45, and a constant speed input shaft that rotationally drives a barrel cylinder 41 of the barrel 42 in the threshing apparatus 40. 221, a constant speed transmission shaft 222 that is operatively connected to the constant speed input shaft 221, performs wind sorting in the swing sorting device 50, and outputs rotational power to the transport device 60; A swing drive shaft 223 that outputs rotational power toward the motion sorting device 50 and a feed chain output shaft 224 that is operatively connected to the swing drive shaft 223 and outputs rotational power toward the feed chain device 20. I have.
The threshing clutch mechanism 45 includes a constant speed driving pulley 231 attached to the constant speed output shaft 220, a constant speed driven pulley 232 attached to the constant speed input shaft 221, the constant speed driving pulley 231 and the constant speed driving pulley 231. A constant-speed transmission belt 233 wound around a high-speed driven pulley 232 and a constant-speed tension roller 234 for applying / releasing tension to the constant-speed transmission belt 233 are provided.

The working system transmission mechanism 200 includes a cutting clutch device 35 inserted in a cutting system transmission path from the engine 9 to the cutting device 30, and the cutting clutch device 35 is connected to the cutting device 30. On the other hand, the constant speed rotational power is selectively engaged or interrupted.
More specifically, the reaping input shaft 225 of the reaping device 30 is operatively connected to the swing drive shaft 223 via the reaping clutch 35 so that it can be operated by the rotational power from the engine 9.
The mowing clutch device 35 includes a driving pulley 235 mounted on the swing driving shaft 223, a driven pulley 236 mounted on the cutting input shaft 225, the driving pulley 235, and the driven pulley 236. A wound cutting transmission belt 237 and a cutting tension roller 238 for applying / releasing tension to the cutting transmission belt 237 are provided.

As shown in FIG. 2, the HST 120 is operatively connected to a main shift lever 21 that can be manually operated, and the sub transmission 130 is operatively connected to a sub transmission lever 22 that can be operated manually.
Further, the constant speed tension roller 234 of the threshing clutch mechanism 45 is operatively connected to the threshing clutch lever 23 that can be operated manually, and the cutting tension roller 238 of the chopping clutch device 35 operates to the cutting clutch lever 24 that can be operated manually. It is connected.

  Here, the auxiliary transmission lever 22, the threshing clutch lever 23 and the reaping clutch lever 24 are connected to a side column 25 provided on the left side with respect to the forward direction of the combine 1 from the driver seat 5 of the combine 1. Arranged in parallel in the front-rear direction, the main transmission lever 21 is disposed in a front column 26 provided in front of the driver's seat 5. In the present embodiment, the threshing clutch lever 23 and the reaping clutch lever 24 are arranged in parallel in the left-right direction (the rotational axis of the threshing clutch lever 23 and the rotational axis of the reaping clutch lever 24 (a mowing described later). The clutch operating shaft 72) is arranged so as to be substantially coaxial.

  In this case, the auxiliary transmission lever 22, the threshing clutch lever 23, and the cutting clutch lever 24 are arranged in parallel in the front and rear in the side column 25 provided on the left side of the driver's seat 5. While a good visibility can be secured, the main transmission lever 21 is arranged on a front column 26 provided in front of the driver's seat 5 separately from the auxiliary transmission lever 22, the threshing clutch lever 23 and the mowing clutch lever 24. Therefore, it is possible to concentrate on the operation of the main transmission lever 21 that is frequently used during work.

In the present embodiment, the auxiliary transmission lever 22 is disposed on the front side of the threshing clutch lever 23 and the reaping clutch lever 24. The main transmission lever 21 is disposed in front of the auxiliary transmission lever 22 and on the right side of the auxiliary transmission lever 22 with reference to the forward direction of the combine.
Further, an inverted U-shaped gripping lever 27 is fixed to the front column 26, and the main transmission lever 21 is arranged on the left side of the gripping lever 27 with respect to the forward direction of the combine 1.
Note that a cross operation lever 28 for performing a lifting operation of the reaping device 30 and a steering operation of the traveling device 10 is disposed on the right side of the grip lever 27 of the front column 26.

  Next, an operation structure related to the auxiliary transmission device 130 and the reaping clutch device 35 in the present embodiment will be described. 4 to 6 are side views of the operation structure according to the embodiment of the present invention. FIG. 4 shows a state in which the cutting clutch lever 24 is in the engaged position and the auxiliary transmission lever 22 is in the high speed position, and FIG. 5 shows a state in which the auxiliary transmission lever 22 is in the low speed position and the cutting clutch lever 24 is in the cutoff position. FIG. 6 shows a state in which the auxiliary transmission lever 22 is in the low speed position and the cutting clutch lever 24 is in the engaged position. 4 to 6, structures other than the operation structure related to the auxiliary transmission 130 and the reaping clutch device 35 (for example, the threshing clutch lever 23 and its operation structure) are omitted.

As shown in FIGS. 4 to 6, the operation structure in the present embodiment includes a high-speed position H in which the auxiliary transmission device 130 is in a high speed range around the auxiliary transmission operation shaft 71 and the auxiliary transmission device 130 according to human operation. The auxiliary transmission lever 22 that can take a low-speed position L in the low-speed range, and a mechanism for setting the cutting clutch device 35 in a power transmission state around a cutting clutch operation shaft 72 that is parallel to the auxiliary transmission operation shaft 71 according to human operation. The reaping clutch lever 24 that can take the joint position E and the severing position C where the reaping clutch device 35 is in a power severing state, and the link mechanism 73 that operatively connects the auxiliary transmission lever 22 and the reaping clutch lever 24 are provided. Yes. The link mechanism 73 moves the auxiliary transmission lever 22 to the high speed position when the cutting clutch lever 24 is operated from the cutoff position C to the engagement position E in a state where the auxiliary transmission lever 22 is positioned at the high speed position H. When the auxiliary transmission lever 22 is in the low-speed position L and the cutting clutch lever 24 is in the engagement position E, the low-speed position L of the auxiliary transmission lever 22 is moved. To the high-speed position H is made impossible.
In the present embodiment, the auxiliary transmission operation shaft 71 and the reaping clutch operation shaft 72 are pivotally supported by the side column frame 25f in a state of being juxtaposed in the vehicle longitudinal direction along the vehicle width direction, The auxiliary transmission lever 22 and the cutting clutch lever 24 can be swung in the longitudinal direction of the vehicle.

Each configuration will be described more specifically.
The auxiliary speed change lever 22 takes a low speed position L and a high speed position H, respectively, when operated in a first direction (here, vehicle front) F and a second direction (here, vehicle rear) R around the auxiliary speed change operation shaft 71. It is configured as follows.
Further, when the reaping clutch lever 24 is operated in the same direction as the first direction F around the reaping clutch operating shaft 72, the reaping clutch lever 24 is located at the engagement position E and is operated in the same direction as the second direction R. And the cut-off clutch lever urging member (for example, a tension spring) 74, when the clutch is located at the engagement position E and the cut-off position C, the first direction F and the first direction F around the cut-clutch operating shaft 72 are It is biased in two directions R. The side column frame 25f is provided with restricting members 83 and 84 for restricting the engagement position E and the cutoff position C of the cutting clutch lever 24, respectively, and resists the biasing force of the cutting clutch lever biasing member 74. Then, the cutting clutch lever 24 is held at the engagement position E or the cutoff position C.

The auxiliary transmission lever 22 is related to a base end portion 22a supported by the auxiliary transmission operation shaft 71, an auxiliary transmission side gripping portion 22b extending upward from the base end portion 22a, and a vehicle longitudinal direction from the base end portion 22a. A sub-transmission-side arm 75 that extends to the opposite side (front of the vehicle) from the cutting clutch operating shaft 72 is provided.
A tip end portion of the auxiliary transmission side arm portion 75 is operatively connected to a shifter (not shown) of the auxiliary transmission device 130, and a base end portion is connected to the transmission operation shaft 71 with respect to the auxiliary transmission side arm portion 75. A sub-transmission link rod 76 that is rotatable about a parallel axis is fixed, and the sub-transmission device 130 is switched to a low speed range or a high speed range according to the swing of the sub transmission lever 22.

The cutting clutch lever 24 includes a base end portion 24a supported by the cutting clutch operating shaft 72, a cutting clutch side gripping portion 24b extending upward from the base end portion 24a, and the cutting clutch operating shaft 72 in the vehicle longitudinal direction. And a cutting clutch side arm portion 24c coupled to the cutting clutch side grip portion 24b so as to be located on the opposite side (rear side of the vehicle) from the auxiliary transmission operation shaft 71. In the present embodiment, the mowing clutch side arm portion 24c extends from the base end portion 24a.
A base end portion of a cutting clutch link rod 77 is fixed to the base end portion 24 a of the cutting clutch lever 24 so as to be rotatable about an axis parallel to the cutting clutch operating shaft 72 with respect to the cutting clutch lever 24. Yes. One end of the cutting clutch lever urging member 74 is fixed to the tip of the cutting clutch link rod 77. The cutting clutch device 35 has a swinging piece 240 that can swing around a swinging shaft 239 that is parallel to the cutting clutch operating shaft 72, and the swinging clutch device 35 extends in the radial direction of the swinging shaft 239. The cutting tension roller is rotatably fixed to one end portion 240 a of the moving piece 240, while the other end of the swing piece 240 is extended to the opposite side of the swing shaft 239 with respect to the one end portion 240 a. The other end portion of the cutting clutch lever urging member 74 is fixed to the portion 240b.
As a result, the cutting tension roller 238 swings about the swinging shaft 239 in response to the swinging of the cutting clutch lever 24, and the cutting clutch device 35 is switched to the power engagement state or the power cutoff state.

  When the harvesting clutch link rod 77 is in the engagement position E, the harvesting clutch link rod 77 has an axis (the biasing force acting direction) of the harvesting clutch lever biasing member 73 so that the harvesting clutch operating shaft 72 and the harvesting clutch It has a partially curved shape so as to be positioned on the first direction F side (front side) from a line segment passing through the other end of the lever urging member 74. Thus, when the harvesting clutch lever 24 is located at the engagement position E, both ends of the harvesting clutch link rod 77 passing on the axis of the harvesting clutch lever urging member 74 are in contact with the first segment. On the other hand, the bending portion of the harvesting clutch link rod 77 is located on the second direction R side with respect to the line segment while being located on the direction F side.

In this case, when the reaping clutch lever 24 is located at the cutoff position C, the axis of the reaping clutch lever urging member 74 is connected to the reaping clutch operating shaft 72 and the other end of the reaping clutch lever urging member 74. Since it is located on the second direction R side (rear side) with respect to the passing line segment (axial line position 74c), the reaping clutch lever 24 is moved by the urging force generated on the axis of the reaping clutch lever urging member 74. The clutch operating shaft 72 is biased in the second direction R side (that is, the cutoff position C side).
When the reaping clutch lever 24 is in the engaged position, the axis of the reaping clutch lever urging member 74 passes through the reaping clutch operating shaft 72 and the other end of the reaping clutch lever urging member 74. Since it is located on the first direction F side (front side) with respect to the line segment (axis line position 74e), the cutting clutch lever 24 is moved to the cutting clutch by the biasing force generated on the axis of the cutting clutch lever biasing member 74. The operation shaft 72 is biased toward the first direction F (that is, the engagement position E side).

  Thus, it is not necessary to provide a biasing member for biasing the harvesting clutch lever 24 to the engagement position E or the cutoff position C separately from the harvesting clutch link rod 77 on the harvesting clutch lever 24, and the harvesting clutch lever 24. Since the reaping clutch lever urging member 74 can be urged to either the engagement position E or the cutoff position C according to the position, the operation structure can be configured more easily.

The link mechanism 73 is a first link member having a base end portion connected to the cutting clutch lever 24 so as to be rotatable about a pivot shaft 78 parallel to the cutting clutch operating shaft 72 and having a long hole 79 formed at a tip portion thereof. 81 and a second link member 82 having a base end portion connected to the sub-transmission-side arm portion 75 of the sub-transmission lever 22 and having an engagement portion 80 engaged with the elongated hole 79 at the distal end portion. I have. In the present embodiment, the base end portion of the second link member 82 is the auxiliary transmission side arm portion so that the engaging portion 80 of the second link member 82 is positioned below the auxiliary transmission operation shaft 71. 75.
The elongated hole 79 communicates between the adjacent end 79a and the separated end 79b on the side close to and away from the pivot shaft 78 and the intermediate end 79a and the separated end 79b. Part 79c.

More specifically, the first link member 81 is a first portion 81a extending in the vehicle front-rear direction, and the elongated hole 79 is formed along the vehicle front-rear direction on the side close to the auxiliary transmission operation shaft 71. A first portion 81a and a second portion 81b extending upward from an end of the first portion 81a on the side close to the harvesting clutch operation shaft 72 and extending away from the auxiliary transmission operation shaft 71, An end portion on the side separated from the auxiliary transmission operation shaft 71 has a second portion 81b connected to the reaping clutch side arm portion 24c so as to be rotatable about the pivot shaft 78.
The end of the second portion 81b on the side separated from the auxiliary transmission operation shaft 71 is positioned below the reaping clutch operation shaft 72 when the reaping clutch lever 24 is located at the cutoff position C. And, when the reaping clutch lever 24 is located at the engagement position E, it is located above the reaping clutch operating shaft 72.
By configuring the link mechanism 73 as described above, the operation structure can be easily configured, and the following actions can be achieved.

Next, a more specific operation of the operation structure will be described.
First, as shown in FIGS. 4 and 5, when the cutting clutch lever 24 is located at the cutoff position C, the auxiliary transmission lever 22 is operated in the first direction F and the second direction R around the auxiliary transmission operation shaft 71. Accordingly, the engagement portion 80 of the second link member 82 is located in the elongated hole 79 of the first link member 81 in the first direction F (proximal end portion 79a side) and the second direction R (separated end) around the auxiliary transmission operation shaft 71. It can be moved to any of the part 79b side). As a result, the auxiliary transmission lever 22 can be operated around the auxiliary transmission operation shaft 71 in the first direction F and the second direction R to be positioned at the low speed position L (FIG. 5) and the high speed position H (FIG. 4).

Here, when the sub-shift lever 22 is located at the high speed position H as shown in FIG. When operated, the sub-shift lever 22 is interlocked with the link mechanism 73 to rotate from the high speed position H to the low speed position L.
That is, when the reaping clutch lever 24 is manually operated from the cutoff position C to the engaging position E, the first link member 81 moves in the first direction F around the reaping clutch operating shaft 72, and accordingly, The separation end 79 b of the elongated hole 79 engages with the engagement portion 80 to rotate the engagement portion 80 in the first direction F around the auxiliary transmission operation shaft 71. Further, the second link member 82 rotates in the first direction F around the auxiliary transmission operation shaft 71 in accordance with the rotation of the engaging portion 80, and in conjunction with this, the auxiliary transmission lever 22 is moved to the auxiliary transmission lever 22. It is rotated around the speed change operation shaft 71 in the first direction F. As a result, the auxiliary transmission lever 22 is rotated from the high speed position H to the low speed position L. As shown in FIG. 6, the auxiliary transmission lever 22 is positioned at the low speed position L and the cutting clutch lever 24 is engaged. The cutting operation state at the position E is entered.

Here, in the cutting operation state as shown in FIG. 6, the direction of the artificial operating force G1 acting on the cutting clutch lever 24 via the second link member 82 and the first link member 81 is the pivot support. It is comprised so that it may become the direction which goes to the axis line of the said cutting clutch operating shaft 72 from the axis line of the axis | shaft 78. FIG.
In this case, since the direction of the artificial operating force G0 acting on the engaging portion 80 of the second link member 82 exists on a line segment G passing through the axis of the pivot shaft 78 and the axis of the cutting clutch operating shaft 72. The direction of the artificial operating force G1 acting on the pivot shaft 78 in the harvesting clutch side arm 24c of the harvesting clutch lever 24 by the artificial manipulation force G0 is also the same as the axis of the pivot shaft 78 and the axis of the harvesting clutch operation shaft 72. It exists on the line segment G which passes through.
That is, the artificial operating force G1 acting on the cutting clutch lever 24 does not have a component for rotating the cutting clutch lever 24 around the cutting clutch operating shaft 72, so that the cutting operation force G1 is generated even if the artificial operating force G1 is generated. The clutch lever 24 does not rotate around the cutting clutch operating shaft 72. Thereby, the first link member 81 connected to the reaping clutch lever 24 also does not move.
Therefore, in the cutting operation state as shown in FIG. 6, an attempt is made to manually operate the auxiliary transmission lever 22 around the auxiliary transmission operation shaft 71 in the second direction R with the cutting clutch lever 24 positioned at the engagement position E. In addition, since the rotation of the engaging portion 80 around the auxiliary transmission operation shaft 71 is restricted by the separation end 79b of the long hole 79 provided in the first link member 81, the auxiliary transmission lever 22 is moved to the high speed position. Cannot be located at H.

  From the above, as shown in FIG. 6, when the harvesting clutch lever 24 is located at the engagement position E, the auxiliary transmission lever 22 is always in the low speed position L unless the harvesting clutch lever 24 is located at the cutoff position C. Therefore, when the reaping clutch device 35 is in the power transmission state, the auxiliary transmission device 130 is always in the low speed range, and the combine 1 can be held in a speed range that does not affect the reaping operation. it can.

In the state where the auxiliary transmission lever 22 is located at the low speed position L and the harvesting clutch lever 24 is located at the engagement position E, the auxiliary transmission lever 22 is artificially moved around the auxiliary transmission operation shaft 71 in the second direction R. When operating, the direction of the artificial operating force acting on the cutting clutch lever 24 via the second link member 82 and the first link member 81 causes the cutting clutch lever 24 positioned at the engagement position E to be You may comprise so that it may become a direction pushed in the 1st direction F around the mowing clutch operation shaft 72.
In this case, the component that rotates the cutting clutch lever 24 around the cutting clutch operation shaft 72 in the artificial operating force acting on the cutting clutch lever 24 occurs only in the first direction F side. Even if an operating force is generated, the cutting clutch operating shaft 72 does not rotate in the second direction R. Therefore, even if the artificial operating force is generated, the cutting clutch lever 24 can be prevented from rotating around the cutting clutch operating shaft 72.

As described above, according to the operation structure having the above-described configuration, when the sub-transmission lever 22 is located at the high speed position H, the sub-transmission device 130 performs the cutting operation from the non-cutting operation state in the high-speed range. By operating the cutting clutch lever 24 from the cutoff position C to the engaging position E, the cutting clutch lever 24 rotates about the cutting clutch operating shaft 72 and the cutting clutch device 35 enters the power transmission state, and the cutting clutch The link mechanism 73 operatively connecting the lever 24 and the sub-transmission lever 22 causes the sub-transmission lever 22 to rotate about the sub-transmission operation shaft 71 to switch from the high speed position H to the low speed position L, thereby causing the sub transmission 130 to operate at a low speed. It becomes an area.
On the other hand, during the cutting operation in which the auxiliary transmission lever 22 is located at the low speed position L and the cutting clutch lever 24 is located at the engagement position E, the auxiliary transmission lever 22 is moved from the low speed position L to the high speed position H by the link mechanism 73. It is regulated not to move to.

  In this way, the link mechanism 73 operatively connecting the auxiliary transmission lever 22 and the harvesting clutch lever 24 enables the harvesting clutch device 35 to be moved with one action to position the harvesting clutch lever 24 at the engagement position E at the start of the harvesting operation. While the power transmission state can be established and the subtransmission device 130 can be engaged in the low speed range, the subtransmission lever 22 is restricted from moving from the low speed position L to the high speed position H by the link mechanism 73 in the cutting operation state. Therefore, it is possible to prevent the reaping clutch device 35 from entering the power cut-off state unexpectedly.

  The embodiment according to the present invention has been described above, but the present invention is not limited to the above embodiment, and various improvements, changes, and modifications can be made without departing from the spirit of the present invention.

FIG. 1 is a left side view of a combine to which an operation structure according to an embodiment of the present invention is applied. FIG. 2 is a top view of the combine to which the operation structure according to the embodiment of the present invention is applied. FIG. 3 is a transmission schematic diagram of a combine to which an operation structure according to an embodiment of the present invention is applied. FIG. 4 is a side view of the operation structure according to the embodiment of the present invention in a state in which the reaping clutch lever is in the engaged position and the auxiliary transmission lever is in the high speed position. FIG. 5 is a side view of the operation structure according to the embodiment of the present invention in a state in which the auxiliary transmission lever is at the low speed position and the cutting clutch lever is in the cutoff position. FIG. 6 is a side view of the operation structure according to the embodiment of the present invention in a state in which the auxiliary transmission lever is at the low speed position and the cutting clutch lever is in the engaged position.

Explanation of symbols

1 Combine 5 Driver's seat 9 Engine (drive source)
DESCRIPTION OF SYMBOLS 10 Traveling device 22 Subtransmission lever 22a Subtransmission lever base end 22b Subtransmission-side gripping portion 24 Harvesting clutch lever 24a Harvesting clutch lever base end portion 24b Harvesting clutch-side gripping portion 24c Harvesting clutch-side arm portion 25 Side column 26 Front Column 30 Mowing device 35 Mowing clutch device 71 Subtransmission operation shaft 72 Mowing clutch operation shaft 73 Link mechanism 74 Mowing clutch lever biasing member 75 Subtransmission side arm portion 78 Pivoting shaft 79 Long hole 79a Proximity end portion 79b Separation end portion 79c Intermediate portion 80 Engagement portion 81 First link member 81a First portion 81b Second portion 82 Second link member 120 Main transmission 130 Sub-transmission C Cut-off position E Engagement position H High-speed position L Constant-speed position F First direction R second direction

Claims (4)

A main transmission and a sub-transmission device that switches a travel shift range by the main transmission to a high speed range or a low speed range are inserted in a travel system transmission path from the drive source to the travel device, and from the drive source to the reaping device An operating structure applied to a combine in which a cutting clutch device for selectively engaging or cutting off power transmission in a cutting system transmission path to be reached,
A sub-shift lever that can take a high-speed position in which the sub-transmission device is in a high-speed range and a low-speed position in which the sub-transmission device is in a low-speed range around the sub-shift operation shaft in response to human operation, and the sub-shift in response to human operation A reaping clutch lever capable of taking an engaging position where the reaping clutch device is in a power transmission state and a severing position where the reaping clutch device is in a power shut-off state around the reaping clutch operating shaft parallel to the operating shaft; A link mechanism for operatively connecting the mowing clutch lever;
The link mechanism moves the auxiliary speed change lever from the high speed position to the low speed position when the reaping clutch lever is operated from the disengagement position to the engagement position while the auxiliary speed change lever is positioned at the high speed position. The sub-transmission lever is configured to be unable to move from the low-speed position to the high-speed position in a state where the sub-transmission lever is positioned at the low speed position and the cutting clutch lever is positioned at the engagement position. The operation structure characterized by having. When the sub-shift lever is operated in the first direction and the second direction around the sub-shift operation shaft, the sub-shift lever takes a low speed position and a high speed position, respectively.
The reaping clutch lever is located at the engagement position when operated in the same direction as the first direction around the reaping clutch operation axis, and is located at the blocking position when operated in the same direction as the second direction. , When the reaping clutch lever urging member is positioned at the engagement position and the cutoff position, the reaping clutch is urged in the first direction and the second direction around the reaping clutch operation shaft,
The link mechanism includes a first link member having a base end portion connected to the cutting clutch lever so as to be rotatable about a pivot shaft parallel to the cutting clutch operation shaft and having a long hole formed at the tip end portion; A second link member connected to the auxiliary transmission lever and provided with an engaging portion engaged with the elongated hole at a tip portion thereof,
The long hole has a proximity end and a separation end on the side close to and apart from the pivot shaft, and an intermediate portion communicating between the proximity end and the separation end.
In a state where the reaping clutch lever is located at the shut-off position, the engaging portion is first around the auxiliary transmission operation shaft in the elongated hole in response to an artificial operation to the high speed position and the low speed position of the auxiliary transmission lever. And move in both the second direction,
When the reaping clutch lever is manually operated from the shut-off position to the engaging position with the auxiliary transmission lever positioned at the high speed position, the separating end engages with the engaging portion and the engaging portion The first link member is interlocked with the cutting clutch lever so that the auxiliary transmission lever is positioned at a low speed position by rotating the auxiliary transmission operation shaft in the first direction. Rotate in one direction,
When the auxiliary transmission lever is manually operated in the second direction around the auxiliary transmission operation shaft in a state where the auxiliary transmission lever is located at the low speed position and the cutting clutch lever is located at the engagement position, the second link member and The direction of the artificial operation force acting on the harvesting clutch lever via the first link member is located in the direction from the axis of the pivot shaft toward the axis of the harvesting clutch operation shaft, or in the engagement position. 2. The operating structure according to claim 1, wherein the operating structure is configured to push the mowing clutch lever in a first direction around the mowing clutch operating axis. The auxiliary transmission operation shaft and the cutting clutch operation shaft are juxtaposed in the vehicle front-rear direction along the vehicle width direction,
The sub-transmission lever includes a base end portion supported by the sub-transmission operation shaft, a sub-transmission side grip portion extending upward from the base end portion, and the cutting clutch operation shaft with respect to the vehicle longitudinal direction from the base end portion. Is an auxiliary transmission side arm portion extending to the opposite side, and the base end portion of the second link member is connected so that the engaging portion of the second link member is positioned below the auxiliary transmission operation shaft. An auxiliary transmission arm portion,
The reaping clutch lever includes a base end portion supported by the reaping clutch operation shaft, a reaping clutch side grip portion extending upward from the base end portion, and the auxiliary clutch lever with respect to the longitudinal direction of the vehicle with respect to the reaping clutch operation shaft. A cutting clutch side arm portion connected to the cutting clutch side grip portion so as to be located on the opposite side to the speed change operation shaft;
The first link member is a first portion extending in the vehicle front-rear direction, the first portion having the elongated hole formed along the vehicle front-rear direction on the side close to the auxiliary transmission operation shaft, A second portion extending upward from an end portion on the side close to the reaping clutch operation shaft and extending away from the auxiliary transmission operation shaft, and an end portion on the side separated from the auxiliary transmission operation shaft Has a second portion connected to the reaping clutch side arm portion so as to be rotatable about the pivot shaft,
An end portion of the second portion that is separated from the auxiliary transmission operation shaft is positioned below the reaping clutch operation shaft when the reaping clutch lever is located at the cutoff position, and the reaping clutch lever The operating structure according to claim 1 or 2, wherein the operating structure is positioned above the reaping clutch operating shaft when the operating position is in the engaged position. The auxiliary transmission lever and the cutting clutch lever are arranged in parallel in the front-rear direction on a side column provided on the left side with respect to the forward direction of the combine from the combine driver's seat.
4. The operating structure according to claim 1, wherein a main transmission lever for operating the main transmission is disposed on a front column provided in front of the driver's seat. 5.

Images