JP2014172436A - Work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work vehicle in which a work part can be operated at a suitable trial operation speed, and lubrication work etc. can be performed efficiently.SOLUTION: A high speed travel groove 26a for switching a travel shift lever 17 from a neutral position N to an advance position F along a guide groove 26 of a lever guide 25 to implement high speed travel and a low speed travel groove 26b for switching the travel shift lever 17 from the neutral position N to the advance position F to implement low speed travel are provided as aligned in the lateral direction, a neutral position groove 26d which communicates with the neutral position of the high speed travel groove 26a and the low speed travel groove 26b is provided in the lateral direction, and, in the neutral position groove 26d, a trial operation groove 26c with a groove length which enables low speed operation suitable for performing maintenance work of a harvesting part 5 at a neutral position of a sub transmission structure is provided.

Description

  The present invention relates to a work vehicle such as a combine equipped with a travel shift lever.

  Conventionally, by operating the travel speed change lever (main speed change lever) along the guide groove of the lever guide alternatively from the neutral position to the forward position and the reverse position, the rotational power of the engine is set to the forward position via the HST. Each of the reverse gears is rotated at a reverse speed, and the sub-transmission mechanism is input to a transmission that selectively switches between a high speed stage and a low speed stage to perform high speed travel (road travel) suitable for road travel, while suitable for cutting travel A combine that allows low speed travel (work travel) is already known (for example, Patent Document 1).

JP 2011-135780 A

The above-described combine is provided so that a travel shift lever that shifts the HST and a sub shift lever that shifts the sub-transmission mechanism are operated along respective operation guide grooves formed in the lever guide. Operate the sub-shift lever of the sub-transmission mechanism to select either high-speed travel (road travel) or low-speed travel (work travel), and then operate the HST travel shift lever to move forward continuously variable by high-speed travel. Then, forward / reverse continuously variable transmission by low-speed traveling is performed. Therefore, the combine in which the traveling speed change lever and the auxiliary variable lever are erected on the lever guide, the operator forgets the operation of switching the auxiliary speed change lever to the low speed stage when performing the cutting operation, and is positioned at the high speed stage. There is a drawback that it is likely to be accompanied by an erroneous operation such as operating the travel shift lever to the forward position. In this case, since the airframe travels at a high speed on the road, troubles such as uncut cereals and clogging of the cereals occur due to the reaping of the reaping part and the speed of conveying the culm. In addition, in order to prevent such an erroneous operation, the operability becomes complicated by requiring attention to the operation of the auxiliary transmission lever. In addition, since the lever guide is provided with a sub-shift lever separately from the travel shift lever, there is a problem that the structure is complicated and the manufacturing cost is increased.
In addition, trial operations performed after maintenance work such as cleaning and inspection / repair of the cutting part, and each maintenance work when lubricating oil is applied to various cutting chains such as cutting blades, pulling up, roots and tips of the cutting part. When performing temporary operation (trial operation) in the ultra-low speed range that must be performed several times at times, the positioning operation at the ultra-low speed position of the traveling speed change lever is likely to be indeterminate, which improves the efficiency of maintenance work. There are problems such as lowering.

In order to solve the problem, the present invention operates the traveling speed change lever 17 along the guide groove 26 of the lever guide 25 to switch from the neutral position N of the guide groove 26 to the forward position F and the reverse position R, and from the engine. The rotational power of the driven HST 20 is steplessly forward-shifted and reverse-shifted and input to a transmission 21 having a sub-transmission mechanism, and the travel transmission lever 17 is operated when the sub-transmission mechanism is switched to a high speed stage. Thus, in the work vehicle 1 that performs high-speed travel for road travel and operates the travel shift lever 17 when the sub-transmission mechanism is switched to the low speed stage, the low-speed travel for work travel is performed.
In the lever guide 25, a high-speed traveling groove 26a for switching from the neutral position N to the forward position F for high-speed traveling and a low-speed traveling groove 26b for switching from the neutral position N to the forward position F for low-speed traveling are arranged side by side. And a laterally-facing neutral position groove 26d that communicates the neutral position N of the high-speed traveling groove 26a and the low-speed traveling groove 26b. A test run groove 26c having a groove length that enables operation at a suitable low speed when performing is provided.

According to the first aspect of the present invention, the lever guide is laterally provided with a high speed travel groove for switching from the neutral position to the forward position for high speed travel and a low speed travel groove for switching from the neutral position to the forward position for low speed travel. Side-by-side neutral position grooves that communicate the neutral positions of the high-speed traveling groove and the low-speed traveling groove are provided side by side, and this neutral position groove is suitable for performing maintenance work on the cutting part at the neutral position of the subtransmission mechanism. By providing a test run groove with a groove length that enables operation at low speed,
When the combiner selects between the high speed traveling groove and the low speed traveling groove with one traveling speed change lever, the alternate speed change mechanism can be switched between the high speed stage and the low speed stage simultaneously. Installation to the lever guide and its switching operation can be made unnecessary, enabling operation without causing an erroneous operation, and the structure of the traveling transmission lever portion can be made simple and inexpensive. In addition, when performing maintenance work such as lubrication of the cutting part, the traveling shift lever can be quickly operated from the neutral position groove that communicates the high-speed traveling groove and the low-speed traveling groove into the trial operation groove. The low-speed stage and the low speed by the HST can operate at a low speed suitable for the trial operation of the working unit, and can facilitate the maintenance work.

It is a whole perspective view of a combine. It is a side view of a traveling speed change operation unit. It is a front view of HST and a transmission. It is a top view of an operation part. It is a top view of a lever guide groove. It is a perspective view which shows the structure of a travel speed change operation part.

  An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a combine equipped with a traveling speed change operation unit 2 according to the present invention, and a traveling machine base 4 having a crawler type traveling device 3 includes a cutting unit 5 and a threshing unit 6 as in the conventional example. The working unit is arranged in the front-rear direction, and the operation unit 7 and the grain storage unit 8 are arranged on the right side of the threshing unit 6 behind the cutting unit 5. An engine (not shown) is mounted in the engine cover 10 that supports the driver seat 9 of the driver 7. With the above configuration, the combine 1 conveys and supplies the cereals harvested by the harvesting unit 5 to the threshing unit 6, and performs a series of combine operations while accommodating the grains threshed and sorted by the threshing unit 6 in the grain storage unit 8. .

  As shown in FIGS. 1, 2, and 4, the operation unit 7 of the combine 1 has a front operation panel unit 12 standing in a lateral direction on the front side of the operation unit floor 11. A side operation panel 13 connected to the front operation panel 12 is erected on the left side of the seat 9 in the front-rear direction. The front operation panel 12 has a multi-steering lever 15 on the panel surface so that it can be swung back and forth and left and right. The multi-steering lever 15 lifts and lowers the cutting unit 5 by swinging back and forth. The aircraft can be steered by a left / right swing operation.

  On the panel surface of the side operation panel 13, an engine control lever 16, a traveling speed change lever 17, a threshing portion clutch lever 18, a reaping portion clutch lever 19 and the like are disposed from the front. The engine power is rotated and adjusted by the operation of the engine control lever 16 and input to the HST 20 shown in FIGS. 2 and 3, and the variable speed rotation power of the HST 20 based on the operation of the traveling speed change lever 17 is incorporated in the transmission 21. The driving wheel 22 pivotally supported on the left and right of the lower part of the transmission 21 through the auxiliary transmission gear and various gears of the auxiliary transmission mechanism from the input shaft is rotated in the forward / reverse direction and at the speed-change rotation. 3 crawlers 23 are driven.

  The HST 20 is fixed to the right side wall of the case of the transmission 21 and drives the input shaft of the transmission 21 from the trunnion shaft. Further, the input shaft drives the drive wheel 22, and the rotational power of the HST 20 is cut without passing through the transmission 7 through a cutting clutch portion (not shown) that is turned on and off based on the operation of the cutting portion clutch lever 19 with respect to the cutting portion 5. The power is transmitted directly to the input shaft of the unit 5. As a result, the cutting unit 5 is transmitted in an interlocked and non-linkable manner with the traveling of the traveling device 3 by the operation of the cutting unit clutch lever 19. Further, the threshing unit 6 is driven by the operation of the threshing unit clutch lever 18 from the engine via another transmission drive mechanism.

  Next, the traveling speed change lever 17, the lever guide 25, and the traveling speed change operation unit 2 will be described. The traveling speed change lever 17 moves the traveling device 3 forward from the neutral position N through the configuration of the traveling speed change operation unit 2 described later by an operation based on the speed change pattern of the guide groove 26 formed in the lever guide 25 shown in FIG. The sub-transmission mechanism is operated by high-speed traveling on the road that is steplessly shifted at the position F and the reverse position R, and the operation from the neutral position N to the forward position F side in the engaged state of the reaping portion clutch lever 19. The low-speed traveling (work traveling) for the cutting operation that is steplessly advanced and shifted in the low-speed range in which is switched. In addition, the trial operation of the cutting unit 5 at the neutral position N can be performed at a trial operation speed in a very low speed region when the trial operation is performed with the cutting unit 5 stopped.

  That is, as shown in FIG. 4 and FIG. 5, the lever guide 25 configured in the side operation panel unit 13 changes the shift pattern of the guide groove 26 into a high-speed traveling groove (road traveling groove) 26 a and a low-speed traveling groove (working). Travel groove) 26b, a trial operation groove (cutting part maintenance work groove) 26c formed between the two, and a neutral position groove 26d connecting the three grooves. The low-speed traveling groove 26b forms a vertically long lever operation path by a forward position F and a reverse position R arranged forward and backward at the right end of the neutral position N. The neutral position groove 26d forms a lateral groove that communicates the neutral position N between the high speed traveling groove 26a and the low speed traveling groove 26b. The high speed traveling groove 26a is formed so as to be parallel to the low speed traveling groove 26b from the left end of the neutral position groove 26d toward the front.

  On the other hand, the test run groove 26c is a short vertical groove that is notched forward from the neutral position groove 26d between the high-speed running groove 26a and the low-speed running groove 26b. This groove length is used for maintenance work such as lubrication as described later. The length is set to set a trial operation speed (operation speed) of the cutting unit 5 that can be suitably performed. The travel speed change lever 17 is operated in the left-right direction along the neutral position groove 26d according to the speed change pattern of the guide groove 26 as described above, and then the sub-speed change mechanism via a linkage mechanism (link mechanism) described later. The auxiliary transmission gear is switched between a high speed stage and a low speed stage.

  As a result, the combine 1 can perform forward high speed travel at the high speed stage on the high speed travel groove 26a side, and forward low speed travel and reverse low speed travel at the low speed travel groove 26b side at the low speed stage. Further, the guide groove 26 according to the embodiment is arranged such that the low speed traveling groove 26b is provided on the right side of the high speed traveling groove 26a and is close to the driver seat 9 side. Thus, the operator can easily perform an adjustment operation of the work speed (cutting speed) that needs to be frequently performed during the combine work without having to extend the arm greatly while paying attention to the front cutting work state or the like. . Further, since the trial run groove 26c is provided in the neutral position groove 26d, the trial run operation can be easily and quickly performed regardless of the groove position of the traveling speed change lever 17.

  Next, the traveling speed change operation unit 2 of the traveling speed change lever 17 will be described with reference to FIGS. In this traveling speed change operation unit 2, a lever mounting shaft 29 protrudes laterally on a frame 28 erected from the transmission 21, and the traveling speed change lever 17 is connected to the lever mounting shaft 29 via a lateral shaft 30 in the front-rear direction. A plate-like mounting member 31 that is pivotably mounted in the left-right direction is pivotally supported. The mounting member 31 has an HST operating arm 31a projecting laterally at a position spaced rearward from the lever mounting shaft 29 side. The tip of the HST operating arm 31a and the trunnion arm 20b of the trunnion shaft 20a of the HST 20 are provided. The tip of the link mechanism is connected to the tip of the link mechanism via a joint member such as a link ball by the HST actuating rod 32 to form a node of the link mechanism.

  As a result, when the traveling speed change lever 17 is rotated forward from the neutral position groove 26d to the high speed traveling groove 26a or the low speed traveling groove 26b side with the lever mounting shaft 29 as a fulcrum, the HST operating arm 31a is moved to the position shown in FIG. The HST 20 is sequentially increased in speed by forward rotation (forward rotation) via the HST operating rod 32, the trunnion arm 20b, and the trunnion shaft 20a, and then input to the transmission 21. Drive while gradually increasing the speed.

  Further, when the HST 20 is rotated backward from the neutral position groove 26d to the reverse travel position R of the low speed traveling groove 26b with the lever mounting shaft 29 as a fulcrum, the HST operating arm 31a is sequentially rotated in the direction of the dotted arrow shown in FIG. Then, the HST 20 is operated in reverse speed (reverse rotation) through the HST actuating rod 32, the trunnion arm 20b, and the trunnion shaft 20a to sequentially increase the speed and input to the transmission 21, thereby causing the vehicle body to travel while increasing in speed.

  On the other hand, the traveling speed change lever 17 attached to the attachment member 31 via the horizontal shaft 30 has the auxiliary transmission arm 33 for switching the auxiliary transmission mechanism in the transmission 21 on the lever base side of the HST operation arm 31a of the attachment member 31. It protrudes so that it is at approximately the same height as the tip. The distal end of the auxiliary transmission arm 33 and the distal end of the auxiliary transmission shaft arm 35a provided in the auxiliary transmission shaft 35 that operates the transmission gear of the auxiliary transmission mechanism in the left-right direction are connected by the auxiliary transmission operating rod 36 via a joint member. doing.

  In the above configuration, the joint portion connecting the HST operating rod 32 to the HST operating arm 31a and the joint portion connecting the auxiliary transmission operating rod 36 to the auxiliary transmission arm 33 are the axis of the lever mounting shaft 29 as shown in FIG. It is provided so as to coincide with the extension of P. As a result, when the traveling speed change lever 17 is rotated back and forth around the lever mounting shaft 29 in the trial run groove 26c, the joint portion (node) of the sub speed change arm 33 is held at the axis P. The HST 20 can be smoothly shifted while maintaining the neutral position of the speed change mechanism.

  Further, when the traveling speed change lever 17 is rotated leftward within the neutral position groove 26d with the horizontal shaft 30 as a fulcrum to reach the high speed traveling groove 26a, the auxiliary speed change arm 33 is moved in the direction of the solid line arrow shown in FIG. In order to move downward, the auxiliary transmission shaft 35 is rotated via the auxiliary transmission operating rod 36 and the auxiliary transmission shaft arm 35a, and the auxiliary transmission gear is switched to a high speed stage so that the airframe is brought to a high speed position (road running position). Can do. Thus, the traveling speed change lever 17 enables the forward speed increase / decrease speed change operation at the high speed stage of the subtransmission mechanism within the high speed traveling groove 26a.

  Further, when the traveling speed change lever 17 is operated to rotate rightward from the above operating position within the neutral position groove 26d with the horizontal shaft 30 as a fulcrum to reach the low speed traveling groove 26b, the auxiliary transmission arm 33 is shown in FIG. Since it moves upward in the direction of the dotted arrow, the sub-transmission shaft 35 is rotated via the sub-transmission operating rod 36 and the sub-transmission shaft arm 35a, and the sub-transmission gear is switched to the low speed stage after passing through the neutral range, and the low speed position (work Traveling position). As a result, the traveling speed change lever 17 enables the forward / reverse movement at the low speed stage of the auxiliary transmission mechanism and the stepless speed increase / decrease speed change operation in the low speed traveling groove 26b.

  Further, when the traveling speed change lever 17 is returned to the neutral position groove 26d from each of the operation positions, and the horizontal shaft 30 is laterally rotated to the right or left with the fulcrum 30 as the fulcrum, the auxiliary transmission arm 33 is moved to the trial operation groove 26c. The auxiliary transmission shaft 35 is returned and rotated via the transmission operating rod 36 and the auxiliary transmission shaft arm 35a, and the auxiliary transmission gear is switched to the neutral range to cut off the transmission to the drive wheel 22 side. When the traveling speed change lever 17 is rotated from the neutral position groove 26d to the stroke end of the groove length in the trial operation groove 26c, the HST operating arm 31a is rotated upward while the neutral position N is maintained. The HST 20 is output to the cutting unit 5 side at a predetermined low-speed rotation defined by the groove length. Thereby, the cutting part 5 can operate a cutting blade, various conveyance chains, etc. in a very low speed range (trial operation speed). The trial run groove 26c has a groove length that sets an upper limit of a trial run speed at which the trial run described later can be suitably performed at a position where the traveling speed change lever 17 is in contact with the front end of the groove serving as a stroke end.

  As described above, the high-speed traveling groove 26a and the low-speed traveling groove 26b for operating and guiding the traveling speed change lever 17 are provided, and the neutral position groove 26d that communicates the neutral position N of both is trimmed at the neutral position of the auxiliary transmission mechanism. The combine 1 provided with the trial run groove 26c having a groove length that is operated at a low speed suitable for maintenance work of the section 5 is set at a high speed on the road by setting the subtransmission mechanism to a high speed stage on the road or in the field. When traveling, the travel shift lever 17 is rotated from the neutral position N to the desired position of the forward position F within the high speed travel groove 26a. As a result, the combine 1 can perform forward high-speed travel with the predetermined rotational power by the HST 20 at the operation position where the travel shift lever 17 is positioned in a state where the sub-transmission mechanism is in the high speed stage.

  When performing the combine work, when the traveling speed change lever 17 is operated laterally (rightward) from the high speed traveling groove 26a to the low speed traveling groove 26b, the subtransmission mechanism is changed from the high speed stage to the low speed stage based on this operation. Therefore, only by rotating the neutral position N of the low-speed traveling groove 26b from the neutral position N to the desired position of the forward movement position F, the work travel speed and the cutting are performed by the work rotation at the operation position where the travel speed change lever 17 is positioned. The cutting operation in which the operation speed of the unit 5 is synchronized can be performed smoothly.

  Further, when the road speed is set again, when the traveling speed change lever 17 is operated laterally (leftward) in the reverse order to reach the high speed traveling groove 26a, the subtransmission mechanism is moved from the low speed stage to the high speed based on this operation. Since it can be switched to a stage, it can be driven at high speed. Therefore, the combine 1 can perform selection of the high speed traveling groove 26a and the low speed traveling groove 26b and switching between the high speed stage and the low speed stage of the subtransmission mechanism at the same time by one traveling speed change lever 17. There is no need to install a sub-change lever in addition to the traveling speed change lever 17 or to switch between them as in the case of the thing. Therefore, the operator can perform an operation without causing an erroneous operation, and can make the structure of the traveling shift lever portion 2 simple and inexpensive.

  Further, when performing the maintenance work such as the removal or cleaning of the sawdust adhering to the cutting portion 5 and the cleaning or inspection and lubrication, the engine is operated with the traveling shift lever 17 returned to the neutral position groove 26d and the neutral position N is maintained. Stop each work. When the engine is started and the reaping part 5 is temporarily operated (trial operation) at the middle of the maintenance operation or when the operation is completed, the travel shift lever 17 is operated in the test operation groove 26c. As a result, the combine 1 can operate the cutting blade of the cutting unit 5 and each conveyance chain at a trial operation speed suitable for the trial operation by the low speed stage of the auxiliary transmission mechanism and the low speed (super low speed) by the HST 20.

  As a result, the operator checks the movement of each of the above parts while the vehicle is stopped and, when further maintenance work is required, returns the traveling gear shift lever 17 to the neutral position groove 26d and holds it at the neutral position N. The mowing unit 5 is stopped and the maintenance work for the required part is completed again. Then, the traveling speed change lever 17 is operated again in the trial operation groove 26c to confirm by the trial operation.

  Therefore, the combine 1 having the test guide groove 26c in the lever guide 25 always performs the test operation of the reaping part 5 repeatedly performed as described above, only by operating one traveling speed change lever 17 to the test operation groove 26c. Since an appropriate trial run speed can be set and maintained, a series of maintenance operations can be performed easily and efficiently. In particular, when the operator performs the lubrication operation by manually holding the lubrication container in his / her hand, the retrial operation can be easily repeated by turning on / off the traveling shift lever 17, so that the Also has the advantage that it can be lubricated with high accuracy throughout its entire length.

  In the embodiment, the traveling speed change operation unit 2 has been described with respect to the operation of the traveling speed change lever 17, the operation means for operating the auxiliary transmission mechanism and the HST 20 to be linked by a link structure. It can also be an operating means for operating. The present invention can also be applied to a rice transplanter or the like provided with a planting device as a working unit in a traveling vehicle.

1 Combine (work vehicle)
2 Traveling shift operation unit 5 Cutting unit 25 Lever guide 17 Traveling shift lever 20 HST
21 Transmission 26a High-speed traveling groove (road traveling groove)
26b Low speed running groove (working running groove)
26c Trial run groove (cutting part maintenance work groove)
26d Neutral position groove N Neutral position F Forward position R Reverse position

Claims (1)

The travel shift lever (17) is operated along the guide groove (26) of the lever guide (25) to switch from the neutral position (N) to the forward position (F) and the reverse position (R) of the guide groove (26). Then, the rotational power of the HST (20) driven from the engine is input to a transmission (21) having a sub-transmission mechanism by performing a stepless forward shift and a reverse shift, and the sub-transmission mechanism is switched to a high speed stage. By operating the traveling speed change lever (17) at a time, high speed traveling for road traveling is performed, and when the traveling speed changing lever (17) is operated at the time of switching to the low speed stage of the subtransmission mechanism, a low speed for work traveling is achieved. In the work vehicle (1) for running,
The lever guide (25) has a high speed travel groove (26a) for switching from the neutral position (N) to the forward position (F) for high speed travel and a low speed travel by switching from the neutral position (N) to the forward position (F). And a low-speed traveling groove (26b) arranged in the horizontal direction, and a laterally-oriented neutral position groove (26d) communicating the neutral position (N) of the high-speed traveling groove (26a) and the low-speed traveling groove (26b). The neutral position groove (26d) is provided with a trial operation groove (26c) having a groove length that can be operated at a low speed suitable for maintenance work of the cutting part (5) at the neutral position of the auxiliary transmission mechanism. A working vehicle characterized by that.

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