JP7262426B2 - combine - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combine harvester provided with a plurality of weed dividers arranged in parallel in the left-right direction and forming a plurality of culm introduction paths.

As the combine harvester described above, for example, the one described in Patent Document 1 is already known. This combine is equipped with a plurality of lifting devices (“grain lifting device” in Patent Document 1) for raising planted grain culms.

In addition, this combine has a drive shaft (“lifting transmission shaft” in Patent Document 1) that provides power to the pulling device. The drive shaft extends in the left-right direction over the tops of the plurality of pulling devices. Further, the drive shaft is accommodated in a pulling transmission tube extending in the left-right direction.

JP 2010-4841 A

In the combine disclosed in Patent Document 1, it is conceivable to provide a shaft cover that covers the drive shaft from the front instead of the pull-up transmission tube. As a result, the drive shaft is protected by the shaft cover, and the drive shaft can be easily accessed simply by removing the shaft cover.

However, when the planted culm is of a long culm variety, it is assumed that the upper part of the planted culm caused by the raising device interferes with the shaft cover. As a result, the upper part of the planted culm is bent forward, and the culm tends to be transported poorly.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a combine harvester in which the drive shaft is reliably protected and in which defective culm transportation is less likely to occur.

A feature of the present invention is that a plurality of weed dividing tools are arranged in parallel in the left-right direction and form a plurality of grain culm introduction paths; a plurality of triggering devices, a drive shaft that extends in the left-right direction across the top of the plurality of triggering devices and applies power to the triggering devices, and a shaft cover that covers the drive shaft from the front, The lifting device includes an endless rotating body, a lifting mechanism having a plurality of claws attached to the endless rotating body, and a lifting mechanism extending downward from the lower end of the shaft cover and exposing the conveying path of the lifting device. A retraction cover that covers the return path of the retraction device and the endless rotating body from the front, and a recess that is recessed upward is formed at the lower end of the portion of the shaft cover that corresponds to the conveying path. When viewed from the front, the recess length of the recess is shorter than the distance between the drive shaft and the lower end of the portion of the shaft cover where the recess is not formed. The lateral width of the lower end portion is wider than the interval between the two raising covers adjacent to each other across the conveying path .

According to the present invention, the concave portion recessed upward is formed in the lower end portion of the portion of the shaft cover corresponding to the transport path. As a result, the upper part of the planted culm raised by the raising device is less likely to interfere with the shaft cover. Therefore, it is easy to avoid the occurrence of defective transport of the planted culm caused by the upper portion of the planted culm interfering with the shaft cover.

Moreover, according to the present invention, the recessed length of the recess is shorter than the distance between the drive shaft and the lower end of the portion of the shaft cover where the recess is not formed when viewed from the front. As a result, when viewed from the front, the lower end of the portion of the shaft cover in which the recess is formed is located below the drive shaft. That is, when viewed from the front, the drive shaft is hidden by the shaft cover over the entire left and right length of the shaft cover. As a result, the drive shaft is reliably protected by the shaft cover.

That is, according to the present invention, it is possible to realize a combine harvester in which the drive shaft is reliably protected and the culm transportation failure is less likely to occur.

Further, in the present invention, it is preferable that the horizontal width of the central portion in the vertical direction of the concave portion is equal to the interval between the two raising covers adjacent to each other with the transport path interposed therebetween.

The strength of the shaft cover tends to increase as the lateral width of the concave portion decreases.

Therefore, according to the above configuration, the strength of the shaft cover tends to be higher than when the lateral width of the concave portion is larger than the interval between the two raising covers that are adjacent to each other with the transport path interposed therebetween.

Further, when the lateral width of the concave portion is smaller than the interval between two raising covers adjacent to each other with the transport path interposed therebetween, a step is likely to be formed between the raising cover and the shaft cover. If the culm is caught in this step, the culm tends to be transported poorly.

Here, according to the above configuration, it is difficult for a step to be formed between the raising cover and the shaft cover. Therefore, it is easy to avoid the occurrence of defective transport of the culms due to the culms getting caught in the steps.

Further, in the present invention, in the shaft cover, a plurality of recesses are formed in a state corresponding to a plurality of the conveying paths, and one recess is provided between two recesses adjacent to each other in the left-right direction. Alternatively, it is preferable that the sum of the lateral widths of the plurality of raising covers is equal to the interval between the two recesses.

In the shaft cover, the greater the lateral width of the portion where the concave portion is not formed, the higher the strength of the shaft cover tends to be.

Here, according to the above configuration, the lateral width of the portion of the shaft cover where no recess is formed corresponds to the lateral width of one or more of the raising covers provided between two recesses adjacent to each other in the lateral direction. is equivalent to the sum of Therefore, compared to the case where the lateral width of the portion of the shaft cover where no recess is formed is smaller than the sum of the lateral widths of one or more raising covers provided between two recesses adjacent to each other in the lateral direction. As a result, the strength of the axle cover tends to increase.

Further, when the sum of the lateral widths of one or more raising covers provided between two recesses adjacent to each other in the left-right direction is smaller than the interval between the two recesses, the raising cover, the shaft cover, Steps are likely to be formed by If the culm is caught in this step, the culm tends to be transported poorly.

Here, according to the above configuration, it is difficult for a step to be formed between the raising cover and the shaft cover. Therefore, it is easy to avoid the occurrence of defective transport of the culms due to the culms getting caught in the steps.

Furthermore, in the present invention, when the claw is positioned at the highest position in the movement range of the claw, the claw is preferably positioned near the shaft cover in a front view. be.

According to this configuration, the portion of the shaft cover where the concave portion is not formed extends downward to the vicinity of the claw portion when positioned at the highest position. Thereby, the drive shaft is reliably protected by the shaft cover.

Further, in the present invention, when viewed from the front, the recessed length of the recess is longer than half of the distance between the lower end of the portion of the shaft cover where the recess is not formed and the drive shaft. preferred.

According to this configuration, compared to the case where the recessed length of the recess is shorter than half the distance between the drive shaft and the lower end of the portion of the shaft cover where the recess is not formed, when viewed from the front, The recessed length of the recess becomes longer. This makes it easier to more reliably avoid interference of the upper part of the planted culm caused by the raising device with the shaft cover. As a result, it is easier to more reliably avoid the occurrence of defective transport of the planted culm caused by the upper portion of the planted culm interfering with the shaft cover.

It is a left view of a combine. It is a top view of a combine. It is a side view of a reaping part. It is a front view of a reaping part. It is a front view which shows the structure of a shaft cover etc. FIG.

A mode for carrying out the present invention will be described based on the drawings. In the following description, unless otherwise specified, the direction of arrow F shown in FIGS. Let the direction of arrow L be "left" and the direction of arrow R be "right." The direction of arrow U shown in FIGS. 1, 3, 4 and 5 is defined as "up", and the direction of arrow D is defined as "down".

[Overall configuration of combine harvester]
As shown in FIGS. 1 and 2, the combine according to the present invention includes a traveling body 1 and a reaping section 2 capable of reaping seven planted grain culms. An engine E is mounted on the traveling body 1 .

The traveling machine body 1 is provided with left and right crawler traveling devices 4R and 4L as traveling devices, and a driving unit 5 on the right side of the front part of the machine body. The driving section 5 is provided with a driver's seat 5a. A threshing device 6 for threshing the culms harvested by the harvesting unit 2 and a grain tank 7 for storing grains obtained by the threshing processing are arranged in the lateral direction of the machine behind the operating unit 5. provided in good condition.

The operating part 5 is covered with a cabin 8 . Although not shown, the threshing device 6 thresh the tip side of the harvested grain culm transported from the harvesting unit 2 while nipping and transporting it with the threshing feed chain 9, and threshing the tip side of the threshing chamber. Grains and dust are sorted out in the sorting unit provided at the bottom. Grains are stored in a grain tank 7, and dust is discharged outside the machine. A grain discharging device 10 capable of discharging the grains stored in the grain tank 7 to the outside and a shredding device 11 for discharging out of the machine after shredding discharged straw after threshing processing are provided. .

The reaping unit 2 includes a plurality of (eight pieces) weed dividing tools 12 arranged in parallel in the left-right direction and forming seven grain culm introduction paths Q1 to Q7, and all the grain culm introduction paths Q1 to Q7. Seven triggering devices 13 provided corresponding to each and raising planted grain culms, and clipper-type reaping devices 14 for cutting planted grain culms introduced into all the grain culm introduction paths Q1 to Q7. , and a conveying device 15 for merging the harvested grain culms in the cutting width direction and conveying them rearward.

Of the eight weeding tools 12, the two weeding tools 12 located on the outermost lateral side of the machine body divide planted grain culms into culms to be harvested and those not to be reaped, and divide the culms to be harvested. It is introduced into the lifting path adjacent to the tool 12 and guides the non-target culms laterally outside the lifting path. The other weed dividing tool 12 divides the culms to be planted on the two planting rows on both lateral sides of the weed dividing tool 12 and introduces them into the raising paths on both lateral sides of the weed dividing tool 12.例文帳に追加The culm introduction paths Q1 to Q7 have widths defined by the weed dividing tools 12 on both the left and right sides, and are used to introduce one row of planting culms.

That is, this combine has a plurality of weed dividers 12 arranged in parallel in the horizontal direction and forming a plurality of culm introduction paths Q1 to Q7. The combine is also provided with a plurality of raising devices 13 that are provided corresponding to the plurality of grain culm introduction paths Q1 to Q7 and raise the planting grain culms.

As shown in FIGS. 1 and 3, the conveying device 15 includes a packer 43A for raking in the culms and a belt 43B with protrusions for raking in the stalks. Further, the conveying device 15 includes stock base conveying devices 50 and 64 and tip conveying devices 51 and 65 . The base conveying devices 50 and 64 pinch and convey the base of harvested grain culms. The tip conveying devices 51 and 65 hold and convey the tips of harvested grain culms. The transport device 15 is driven by power from the engine E. As shown in FIG.

Further, the transport device 15 includes a threshing depth transport device 78 and a delivery and supply device 79 . The threshing depth conveying device 78 receives the reaping grain culms from the root conveying devices 50 and 64 and conveys them toward the threshing feed chain 9 . Also, the transfer supply device 79 receives the harvested grain culms from the threshing depth conveying device 78 and delivers the harvested grain culms to the starting end of the threshing feed chain 9 .

[Frame structure of the reaping part]
Next, the frame structure of the reaping part 2 will be described. As shown in FIG. 1, a front-rear cylindrical reaping support frame 16 is provided to support the reaping part 2 as a whole so that it can move up and down with respect to the traveling body 1 . The reaping support frame 16 is supported by a lateral pivotal support 17 provided on the base end side of the rear upper portion.

A cylindrical lower lateral frame 19 is connected to the front end of the reaping support frame 16 and extends in the left-right direction, that is, in the reaping width direction. As shown in FIG. 1, front-rear splitting frames 20 on both left and right sides are connected to both ends of the lower lateral frame 19 in the machine body width direction so as to extend toward the front of the machine body. A rectangular tube-shaped cutting blade support frame 21 extending in the lateral width direction of the machine body is connected to the cutting blade support frame 21 extending in the lateral width direction of the machine body in a state of being bridged between the front and rear middle portions of the grass dividing frames 20 on the left and right ends. The reaping device 14 is supported by a reaping blade support frame 21 .

As shown in FIG. 2, a plurality of divided grass frames 20 are provided at intervals between the divided grass frames 20 at both left and right ends. The dividing grass frame 20 in the intermediate portion is connected at the rear end portion to the cutting blade support frame 21 and extends in a cantilevered manner toward the front of the machine body. A total of eight grass-dividing frames 20 are provided, and the front end of each grass-dividing frame 20 is provided with a weed-dividing tool 12, respectively.

As shown in FIG. 1, a cylindrical left vertical frame 25 extends upward from the left end of the lower horizontal frame 19 .

[Lifting device]
As shown in FIGS. 1 and 3, each triggering device 13 is provided in an upright posture in which the lower end side is positioned toward the front side of the fuselage, and the upper end side is positioned toward the rear side of the fuselage toward the rear side of the fuselage. Note that FIG. 3 shows the line of sight LE of the driver seated on the driver's seat 5a. As shown in FIG. 3, the reaping unit 2 is configured so that the tip of the weed dividing tool 12 can be seen by the driver while seated on the driver's seat 5a.

The configuration of each pulling device 13 will be described below.

As shown in FIG. 4 , the pulling device 13 has a pulling mechanism 24 and a pulling cover 27 . The pulling mechanism 24 includes an endless rotating chain 31 (“endless rotating body” according to the present invention) wound around the driving sprocket 28 and the tensioning sprocket 29 positioned above, and the driven sprocket 30 positioned below. equivalent to ).

The pulling mechanism 24 also has a plurality of claw portions 32 . The plurality of claws 32 are attached to the endless rotatable chain 31 at predetermined intervals along the longitudinal direction of the endless rotatable chain 31 .

A drive shaft 33 extending in the left-right direction is provided across the upper portions of the seven triggering devices 13 . Power from the engine E is transmitted to the drive shaft 33 . Power from the drive shaft 33 is transmitted to the drive sprocket 28 via a relay transmission shaft 35 (see FIG. 3) provided inside the relay transmission case 34 . The drive shaft 33 thereby provides power to the triggering device 13 . The drive shaft 33 has a hexagonal cross-sectional shape and is configured to transmit power in a square fitting state.

That is, this combine has a drive shaft 33 that extends in the left-right direction across the upper portions of the plurality of pulling devices 13 and that provides power to the pulling devices 13 .

Here, power transmission from the engine E to the drive shaft 33 will be described in detail. As shown in FIG. 3 , this combine has a lateral transmission shaft 111 , a reaping transmission shaft 112 and a lateral input shaft 113 .

The lateral transmission shaft 111 extends in the left-right direction and is housed inside the pivotal support portion 17 . The reaping transmission shaft 112 extends in the front-rear direction while being lowered forward, and is housed inside the reaping support frame 16 . The horizontal input shaft 113 extends in the left-right direction and is housed inside the lower side horizontal frame 19 .

The power of the engine E is transmitted to the lateral transmission shaft 111 . Further, power is transmitted from the lateral transmission shaft 111 to the lateral input shaft 113 via the reaping transmission shaft 112 . Power is transmitted from the horizontal input shaft 113 to the drive shaft 33 via a vertical transmission shaft (not shown) accommodated in the left vertical frame 25 .

As shown in FIG. 4, in the lifting device 13, one of the vertical movement paths on the left and right sides of the endless rotating chain 31 is set as the transport path T1, and the other side is set as the return path T2. Although not shown, in the conveying path T1, a guide plate is provided at a position through which the endless rotating chain 31 passes to guide the pawl portion 32 in an upright position.

As shown in FIG. 4 , among the plurality of pulling devices 13 , the pulling devices 13 other than the fifth pulling device 13 from the right side are arranged so that the claw portions 32 face each other on the left and right. The fifth triggering device 13 from the right is arranged in a state in which the claw portion 32 protrudes leftward and stands upright.

In the transport path T1, the pulling device 13 moves upward while the laterally protruding claws 32 act to comb up the culms. , and descends along the return path T2 to return to the conveying path T1. As a result, each raising device 13 raises and processes planted grain culms introduced into the raising path by the claws 32 moving upward.

The raising cover 27 extends vertically. The pulling cover 27 is configured to cover the return path T2 of the pulling device 13 and the endless rotating chain 31 from the front while exposing the conveying path T1 of the pulling device 13 .

[Axis cover]
As shown in FIGS. 4 and 5, this combine has a shaft cover 39 . The shaft cover 39 extends in the left-right direction over the upper portions of the seven triggering devices 13 and covers the drive shaft 33 from the front. Also, the raising cover 27 extends downward from the lower end of the shaft cover 39 .

That is, this combine has a shaft cover 39 that covers the drive shaft 33 from the front. The pulling device 13 includes an endless rotating chain 31 and a pulling mechanism 24 having a plurality of claws 32 attached to the endless rotating chain 31, and a shaft cover 39 extending downward from the lower end of the shaft cover 39. It has a pulling cover 27 that covers the return path T2 of the pulling device 13 and the endless rotating chain 31 from the front while exposing the path T1.

FIG. 5 shows the claw portion 32 positioned at the highest position P. As shown in FIG. The highest position P is the highest position in the movement range of the claw portion 32 . As shown in FIG. 5, when the claw portion 32 is positioned at the highest position P, the claw portion 32 is positioned near the shaft cover 39 in a front view.

That is, when the claw portion 32 is positioned at the highest position in the movement range of the claw portion 32, the claw portion 32 is positioned near the shaft cover 39 in a front view.

As shown in FIGS. 4 and 5, the lower end of the shaft cover 39 is formed with a first recess 40a, a second recess 40b, a third recess 40c, and a fourth recess 40d. The first recess 40a, the second recess 40b, the third recess 40c, and the fourth recess 40d are all recesses 40 recessed upward.

The first recesses 40a are formed in portions of the shaft cover 39 corresponding to the first transport path T1 and the second transport path T1 from the right side.

The second recesses 40b are formed in portions of the shaft cover 39 corresponding to the third transport path T1 and the fourth transport path T1 from the right side.

The third concave portion 40c is formed in a portion of the shaft cover 39 corresponding to the fifth conveying path T1 from the right side.

The fourth concave portion 40d is formed in a portion of the shaft cover 39 corresponding to the sixth conveying path T1 and the seventh conveying path T1 from the right side.

That is, a concave portion 40 that is recessed upward is formed in the lower end portion of the portion of the shaft cover 39 corresponding to the transport path T1. Further, in the shaft cover 39, a plurality of recesses 40 are formed corresponding to the plurality of transport paths T1.

Here, FIG. 5 shows the first position H1 and the second position H2. The first position H1 is the vertical position of the lower end of the portion of the shaft cover 39 where the recess 40 is formed. The second position H2 is the position in the vertical direction of the lower end of the portion of the shaft cover 39 where the recess 40 is not formed.

The distance between the first position H1 and the second position H2 in the vertical direction is equal to the recess length D1 of the recess 40 in front view.

FIG. 5 also shows a third position H3. The third position H3 is the position of the lower end of the drive shaft 33 in the vertical direction. The third position H3 is a position higher than the first position H1.

The interval between the second position H2 and the third position H3 in the vertical direction is a predetermined interval D2. The predetermined distance D2 is equal to the distance between the drive shaft 33 and the lower end of the portion of the shaft cover 39 where the recess 40 is not formed, when viewed from the front. As shown in FIG. 5, the recess length D1 is shorter than the predetermined interval D2.

That is, when viewed from the front, the recess length D1 of the recess 40 is shorter than the distance between the drive shaft 33 and the lower end of the portion of the shaft cover 39 where the recess 40 is not formed.

FIG. 5 also shows the length D3. The length D3 is half the distance between the lower end of the portion of the shaft cover 39 where the recess 40 is not formed and the drive shaft 33 when viewed from the front. And the recessed length D1 is longer than the length D3.

That is, when viewed from the front, the recess length D1 of the recess 40 is longer than half the distance between the drive shaft 33 and the lower end of the portion of the shaft cover 39 where the recess 40 is not formed.

FIG. 5 also shows a first width W1 and a second width W2. The first width W1 is the lateral width of the third recess 40c. Also, the second width W2 is the distance between the two raising covers 27 adjacent to each other across the transport path T1 corresponding to the third recess 40c.

The first width W1 is equivalent to the second width W2. That is, the lateral width of the concave portion 40 is equivalent to the interval between the two raising covers 27 adjacent to each other with the transport path T1 interposed therebetween.

It should be noted that the term "equivalent" according to the present invention includes not only the state of strict matching but also the state of approximately matching.

Further, as shown in FIG. 5, the concave portion 40 in this embodiment has a shape that widens toward the bottom. The first width W1 is the horizontal width of the central portion of the third recess 40c in the vertical direction. That is, the lateral width of the central portion of the third recess 40c in the vertical direction substantially matches the second width W2. Further, the lateral width of the upper end portion of the third recess 40c is slightly narrower than the second width W2. Further, the lateral width of the lower end portion of the third recess 40c is slightly wider than the second width W2.

Thus, in the present embodiment, the lateral width of the central portion in the vertical direction of each concave portion 40 substantially matches the interval between the two raising covers 27 adjacent to each other with the transport path T1 interposed therebetween. Further, the lateral width of the upper end portion of each concave portion 40 is slightly narrower than the interval between the two raising covers 27 adjacent to each other with the transport path T1 interposed therebetween. Further, the lateral width of the lower end portion of each recess 40 is slightly wider than the interval between the two raising covers 27 adjacent to each other with the transport path T1 interposed therebetween.

FIG. 5 also shows a third width W3, a fourth width W4, and a fifth width W5. The third width W3 is the distance between the second recess 40b and the third recess 40c. The second recess 40b and the third recess 40c are two recesses 40 adjacent to each other in the left-right direction.

The fourth width W4 is the lateral width of the lifting cover 27 of the fourth lifting device 13 from the right side among the seven lifting devices 13 shown in FIG. The fifth width W5 is the lateral width of the lifting cover 27 of the fifth lifting device 13 from the right side among the seven lifting devices 13 shown in FIG. These two raising covers 27 are provided between the second recess 40b and the third recess 40c in the left-right direction.

Then, as shown in FIG. 5, the sum of the fourth width W4 and the fifth width W5 is equivalent to the third width W3.

FIG. 5 also shows a sixth width W6 and a seventh width W7. The sixth width W6 is the distance between the third recess 40c and the fourth recess 40d. The third recess 40c and the fourth recess 40d are two recesses 40 adjacent to each other in the left-right direction.

The seventh width W7 is the lateral width of the lifting cover 27 of the sixth lifting device 13 from the right side among the seven lifting devices 13 shown in FIG. This cover 27 is provided between the third recess 40c and the fourth recess 40d in the left-right direction.

Then, as shown in FIG. 5, the seventh width W7 is equivalent to the sixth width W6.

That is, the total lateral width of the one or more raising covers 27 provided between two recesses 40 adjacent to each other in the left-right direction is equivalent to the interval between the two recesses 40 .

With the configuration described above, the recess 40 recessed upward is formed at the lower end of the portion of the shaft cover 39 corresponding to the transport path T1. As a result, the upper part of the planted culm raised by the raising device 13 is less likely to interfere with the shaft cover 39 . Therefore, it is easy to avoid the occurrence of defective transportation of the planted culm caused by the upper portion of the planted culm interfering with the shaft cover 39 .

Moreover, with the configuration described above, the recessed length D1 of the recessed portion 40 is the distance between the drive shaft 33 and the lower end of the portion of the shaft cover 39 where the recessed portion 40 is not formed. shorter than As a result, the lower end of the portion of the shaft cover 39 in which the concave portion 40 is formed is located below the drive shaft 33 when viewed from the front. That is, in a front view, the drive shaft 33 is hidden by the shaft cover 39 over the entire left and right length of the shaft cover 39 . As a result, the drive shaft 33 is reliably protected by the shaft cover 39 .

That is, with the configuration described above, it is possible to realize a combine harvester in which the drive shaft 33 is reliably protected and the grain culm transportation failure is less likely to occur.

[Other embodiments]
(1) Instead of the crawler traveling devices 4R and 4L, a wheel type traveling device may be provided, or a semi-crawler type traveling device may be provided.

(2) The lateral width of the concave portion 40 may be larger or smaller than the interval between the two raising covers 27 adjacent to each other with the transport path T1 interposed therebetween.

(3) The number of recesses 40 formed in the shaft cover 39 may be any number other than four. For example, the number of recesses 40 may be one.

(4) The total lateral width of the one or more raising covers 27 provided between two recesses 40 adjacent to each other in the lateral direction may be larger than the interval between the two recesses 40, Small is fine.

It should be noted that the configurations disclosed in the above-described embodiments (including other embodiments; the same shall apply hereinafter) can be applied in combination with configurations disclosed in other embodiments unless there is a contradiction. Moreover, the embodiments disclosed in this specification are merely examples, and the embodiments of the present invention are not limited to these, and can be modified as appropriate without departing from the scope of the present invention.

INDUSTRIAL APPLICABILITY The present invention is applicable to a combine having a plurality of raising devices for raising planted culms.

REFERENCE SIGNS LIST 12 weeding tool 13 pulling device 24 pulling mechanism 27 pulling cover 31 endless rotating chain (endless rotating body)
32 claw portion 33 drive shaft 39 shaft cover 40 recess D1 recess length Q1 to Q7 culm introduction path T1 transfer path T2 return path

Claims (5)

a plurality of weeding tools arranged in parallel in the left-right direction and forming a plurality of culm introduction paths;
a plurality of raising devices provided corresponding to the plurality of grain culm introduction paths and causing planting grain culms;
a drive shaft extending in the left-right direction over the upper portions of the plurality of triggering devices and applying power to the triggering devices;
a shaft cover that covers the drive shaft from the front,
The lifting device includes an endless rotating body, a lifting mechanism having a plurality of claws attached to the endless rotating body, and a lifting mechanism extending downward from the lower end of the shaft cover and exposing the conveying path of the lifting device. a return path of the triggering device and a triggering cover that covers the endless rotating body from the front;
A concave portion recessed upward is formed in a lower end portion of a portion of the shaft cover corresponding to the conveying path,
When viewed from the front, the recessed length of the recess is shorter than the distance between the lower end of the portion of the shaft cover where the recess is not formed and the drive shaft,
A combine harvester in which the lateral width of the lower end portion of the concave portion is wider than the interval between the two raising covers adjacent to each other across the conveying path. 2. The combine according to claim 1 , wherein the lateral width of the central portion of the concave portion in the vertical direction is equal to the interval between the two raising covers adjacent to each other across the conveying path. a plurality of recesses are formed in the shaft cover so as to correspond to the plurality of transport paths,
The combine according to claim 1 or 2, wherein the total lateral width of one or more of the raising covers provided between the two recesses adjacent to each other in the lateral direction is equal to the interval between the two recesses. . 4. The claw portion according to any one of claims 1 to 3, wherein when the claw portion is positioned at the highest position in the moving range of the claw portion, the claw portion is positioned near the shaft cover in a front view. A combine as described above. 5. Any one of claims 1 to 4, wherein, when viewed from the front, the recessed length of the recess is longer than half of the distance between the lower end of the portion of the shaft cover where the recess is not formed and the drive shaft. or the combine according to paragraph 1.

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