JP6676288B2 - Combine - Google Patents

Description

  The present invention relates to a combine equipped with a cutting unit for cutting uncut culms in a field and a threshing unit for threshing grains of the cut culms.

  BACKGROUND ART Conventionally, a traveling body having a traveling unit and a driver's seat, a reaping unit having a cutting blade, a threshing unit having a handling drum, a feeder house for supplying a cutting culm from the reaping unit to the threshing unit, and an engine for driving each unit There is a technology for providing a grain sorting mechanism for sorting thresh from a threshing unit, and continuously cutting unharvested grain culms in a field to thresh. There is also a technique in which the traveling crawler is stretched on a track frame via a driving sprocket, a tension roller, and a movable rolling wheel (see Patent Documents 1 to 4).

JP 2003-48574 A JP 2004-210182 A JP-A-2004-36639 JP-A-2006-1461

  In the prior art, a front and rear extending frame that forms the traveling body is provided, and when a rear reinforcing plate is connected to a rear surface side of the front and rear extending frame and the rear supporting leg, the rear supporting leg structure is simplified to reduce manufacturing costs. If it is reduced, there is a problem that the supporting load of the front and rear extension frames cannot be easily secured, mud in the field is easily accumulated on the front side of the left and right extension frames, and running resistance due to accumulation of the mud in the field cannot be easily reduced. . Further, in the structure in which the traveling crawler is provided as a traveling unit and the traveling crawler is stretched on the track frame via the driving sprocket, the tension roller, and the movable rolling wheel, the crawler detachment prevention member is provided at a position apart from the tension roller. When the tension member is damaged due to abnormal tension of the traveling crawler, there is a problem that the tension crawler is moved from a predetermined support position and the traveling crawler is likely to come off. In addition, since the support frame of the movable wheel rotates and the wheel shaft fixed to the track frame wears, there is a problem that a troublesome repair work such as replacement of the wheel shaft is required. Further, there is also a problem that it is difficult for the operator to know when to replace the driving sprocket, and running troubles are likely to occur in the field due to local wear of the teeth of the driving sprocket, and the harvesting operation cannot be continued. .

  Therefore, the present invention seeks to provide a combine that has been improved by examining these conditions.

In order to achieve the object, the invention according to claim 1 includes a traveling body having a traveling unit and a driver's seat, a reaping unit having a cutting blade, a threshing unit having a handling drum, the reaping unit and the threshing unit. In a combine equipped with an engine to be driven, a front and rear extension frame and a left and right extension frame forming the traveling body are provided, and an upper end side of a rear support leg is fixed to the front and rear extension frame and the left and right extension frame, A front reinforcing plate is connected to the front and rear extending frame and the front side of the rear supporting leg, and a rear reinforcing plate is connected to the front and rear extending frame and a rear surface of the rear supporting leg. The front and rear width dimension of the rear reinforcing plate is formed larger than the front and rear width dimension of the reinforcing plate, and the left and right sides are provided between the working unit mounting frame frame on the front and rear extension frame and the front reinforcing plate. Extend the front of the extension frame A mudguard cover body, the mudguard cover body includes a central cover for closing a space between the left and right extending frames and the working portion mounting frame frame, the front reinforcing plate and the center. Left and right side covers for closing the space between the right and left ends of the cover, and the central cover and the left and right side covers form a tunnel- shaped space in a front view below the working unit mounting frame frame body. It is formed.

According to a second aspect of the present invention, there is provided a combine according to the first aspect, further comprising a traveling crawler as the traveling portion, wherein the traveling crawler is stretched on a track frame via a driving sprocket and a tension roller. The crawler is prevented from coming off on the support member of the tension roller.

According to a third aspect of the present invention, in the combine according to the first aspect, the traveling crawler is provided as the traveling portion, and the traveling crawler is stretched on the track frame via a driving sprocket, a tension roller, and a movable rolling wheel. In this structure, a support frame of the movable wheel is rotatably supported on a wheel shaft fixed to the track frame via a collar.

The invention according to claim 4 is the combine according to claim 1, further comprising left and right traveling crawlers as the traveling portion, the traveling crawler being stretched on a track frame via a driving sprocket, and the driving sprocket being provided. A plurality of teeth are formed at equal intervals on the outer peripheral surface of the drive sprocket, and a part of the teeth of the drive sprocket is meshed with the traveling crawler. A wear detection groove is formed on the outer surface of the tooth.

According to the invention described in claim 1, a traveling body having a traveling unit and a driver's seat, a reaping unit having a cutting blade, a threshing unit having a handling drum, and an engine that drives the reaping unit and the threshing unit are provided. The combine includes a front and rear extension frame and a left and right extension frame forming the traveling body, and an upper end side of a rear support leg is fixed to the front and rear extension frame and the left and right extension frame, and the front and rear extension A front reinforcing plate is connected to the frame and the front side of the rear supporting leg, and a rear reinforcing plate is connected to the front and rear extending frame and the rear side of the rear supporting leg, and the front reinforcing plate is The front-rear reinforcing plate body is formed so that the front-rear reinforcing plate body has a front-rear width dimension that is larger than the front-rear reinforcing plate body. Mudguard to cover side A bar body is stretched, and the mudguard cover body includes a center cover that closes a space between the left and right extending frames and the working unit mounting frame frame, the front reinforcing plate body, and the left and right ends of the center cover. Left and right side covers for closing the space between the work unit mounting frame and the central cover and the left and right side covers, and a tunnel- shaped space is formed below the working unit mounting frame in a front view. Therefore, it is possible to easily secure the connection strength between the front and rear extension frame and the support leg, easily secure the connection rigidity between the traveling body (front and rear extension frame) and the track frame, and perform sheet metal processing on the rear support leg. The manufacturing cost can be reduced, and the weight of the rear support leg can be reduced.

Further, it is possible to eliminate the problem that mud in the field is accumulated on the front side of the left and right extending frames, and it is possible to easily reduce the running resistance due to the accumulation of the mud in the field.

According to the second aspect of the present invention, there is provided a structure in which the traveling crawler is provided as the traveling portion, and the traveling crawler is stretched on a track frame via a driving sprocket and a tension roller, and a support member for the tension roller is provided. Is provided with a crawler disengagement prevention member, so that even if a stone or the like enters between the tension roller and the traveling crawler, and the traveling crawler is abnormally tensioned and the tension member is damaged, the tension roller is kept at a predetermined supporting position. The crawler disengagement prevention body also moves when moving from, so that the traveling crawler can be prevented from coming off. The breakage of the tension member can be smoothly repaired while the breakage of the traveling crawler can be easily prevented.

According to the third aspect of the present invention, there is provided a structure in which the traveling crawler is provided as the traveling portion, and the traveling crawler is stretched on a track frame via a driving sprocket, a tension roller, and a movable rolling wheel. Since the supporting frame of the movable wheel is rotatably supported via a collar on the wheel shaft fixed to the frame, wear of the wheel shaft can be reduced, and troublesome operations such as replacement of the wheel shaft are performed. The time of the repair work can be easily delayed.

According to the invention as set forth in claim 4 , the vehicle further comprises left and right traveling crawlers as the traveling portion, the traveling crawler is stretched on a track frame via a driving sprocket, and a plurality of teeth are formed on an outer peripheral surface of the driving sprocket. Are formed at equal intervals, and a part of the teeth of the drive sprocket is meshed with the traveling crawler. The outer surface of the tooth at the toothed position and the outer surface of the tooth at the non-engaged position are worn. Since the detection groove is formed, the operator can properly detect the timing of replacing the drive sprocket and prevent running troubles occurring in the field due to local wear of the teeth of the drive sprocket. it can. Also, by forming a wear detection groove that detects wear on the forward rotation side and a wear detection groove that detects wear on the reverse rotation side, it is necessary to replace the left and right drive sprockets with a new drive sprocket during rotation work. And the cost of repair parts can be reduced.

It is a left view of the combine showing the 1st embodiment of the present invention. It is a right view of a combine. It is a top view of a combine. It is a left view of a traveling body. It is the elements on larger scale of FIG. It is sectional explanatory drawing of a support leg part. It is sectional explanatory drawing of a left-right extending frame part. It is a rear view of a traveling body. FIG. 4 is a rear view of the traveling body without the traveling crawler. It is the elements on larger scale of the back view of a traveling body. FIG. It is a top view of a traveling body. It is the elements on larger scale of FIG. FIG. FIG. 4 is a partially enlarged perspective view of the mudguard cover body of the traveling machine body as viewed from the front. It is a front enlarged view of a mudguard cover body. It is a side view of a mudguard cover body. It is a side enlarged sectional view of a mudguard cover body. It is a partial expanded sectional view of a mudguard cover body. It is a side view of a tension roller part. It is a rear view of a tension roller part. It is a rear view which shows the menopause structure of a rolling wheel. It is a side view of a crawler detachment prevention structure. It is a rear view of a crawler detachment prevention structure. It is a side view of the track frame part provided with the movable rolling wheel. It is an enlarged explanatory view of a movable wheel attachment part. FIG. 4 is a partial perspective view of the driving sprocket portion as viewed from the front. It is a partial side view of a drive sprocket part. It is an enlarged explanatory view of a drive sprocket part. It is a right-left rotation explanatory drawing of a drive sprocket. It is a side view of a crawler detachment prevention body attaching part. FIG. 32 is an enlarged explanatory diagram of FIG. 31. It is a top view of a crawler detachment prevention body attachment part. FIG. 34 is an enlarged explanatory view of FIG. 33.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a left side view of the ordinary combine, FIG. 2 is a right side view thereof, and FIG. 3 is a plan view thereof. First, the schematic structure of the ordinary combine will be described with reference to FIGS. In the following description, the left side of the traveling body 1 in the forward direction is simply referred to as the left side, and the right side in the forward direction is simply referred to as the right side.

  As shown in FIGS. 1 to 3, the ordinary combine in the embodiment includes a traveling body 1 supported by a pair of left and right traveling crawlers 2 made of rubber crawlers as a traveling portion. At the front of the traveling machine body 1, a cutting unit 3 for cutting and harvesting uncut culms such as rice (or wheat, soybean, or corn) while cutting is mounted with a single-acting lifting hydraulic cylinder 4 so as to be movable up and down. ing.

  On the left side of the traveling machine body 1, a threshing unit 9 for threshing the harvested grain culm supplied from the mowing unit 3 is mounted. At the lower part of the threshing unit 9, a grain sorting mechanism 10 for performing rocking sorting and wind sorting is arranged. A driver's cab 5 is mounted on the front right side of the traveling machine body 1 as a driver on which an operator rides. The engine 7 as a power source is arranged in the cab 5 (below the driver's seat 42). Behind the cab 5 (on the right side of the traveling machine 1), a grain tank 6 for taking out the grain from the threshing unit 9 and a grain for discharging the grain in the grain tank 6 toward the truck bed (or container or the like). Discharge conveyor 8 is arranged. The grain discharge conveyor 8 is tilted outward, and the grains in the Glen tank 6 are carried out by the grain discharge conveyor 8.

  The reaper 3 includes a feeder house 11 communicating with a handle 9 a at a front part of the threshing unit 9, and a horizontally long bucket-shaped grain header 12 continuously provided at a front end of the feeder house 11. A scraping auger 13 (platform auger) is rotatably supported in the grain header 12. The rake bar with tine bar 14 is arranged above the front of the rake auger 13. A clipper-like cutting blade 15 is arranged at the front of the grain header 12. Left and right weeds 16 are protruded on both left and right sides of the front of the grain header 12. Further, a supply conveyor 17 is provided in the feeder house 11. A beater 18 (front rotor) for cutting culm input is provided on the feed end side (handle 9a) of the supply conveyor 17. The lower surface of the feeder house 11 and the front end of the traveling machine 1 are connected via a hydraulic cylinder 4 for elevating and lowering, and the mowing unit 3 is moved up and down with a cutting input shaft 3a (feeder house conveyor shaft) described later as a lifting fulcrum. It moves up and down by the hydraulic cylinder 4 for use.

  With the above configuration, the tip side of the uncut grain culm between the left and right weeds 16 is scraped by the raking reel 14, the culm base side of the uncut grain culm is cut by the cutting blade 15, and Due to the rotational drive, the harvested grain culm is collected near the entrance of the feeder house 11 near the center of the left and right width of the grain header 12. The entire amount of the harvested culm of the cereal header 12 is conveyed by the supply conveyor 17, and is fed into the handle 9 a of the threshing unit 9 by the beater 18. A horizontal control hydraulic cylinder (not shown) for rotating the grain header 12 around a horizontal control fulcrum axis is provided, and the horizontal inclination of the grain header 12 is adjusted by the horizontal control hydraulic cylinder to thereby control the grain header. It is also possible to support the 12, the cutting blade 15 and the raking reel 14 horizontally with respect to the field scene.

  As shown in FIGS. 1 and 3, a handling drum 21 is rotatably provided in a handling room of the threshing unit 9. A handling cylinder 21 is supported by a handling cylinder shaft 20 extending in the front-rear direction of the traveling machine body 1. On the lower side of the handling cylinder 21, a receiving net 24 for letting the grains leak is provided. A spiral screw blade-like intake blade 25 is provided on the outer peripheral surface of the front part of the handling cylinder 21 so as to project radially outward.

  With the above configuration, the harvested grain culm thrown in from the handling port 9 a by the beater 18 is transported toward the rear of the traveling machine 1 by the rotation of the handling cylinder 21, and between the handling cylinder 21 and the receiving net 24. Kneaded and threshed. Threshing materials such as grains smaller than the mesh of the receiving net 24 leak from the receiving net 24. Straw and the like that do not leak from the receiving net 24 are discharged to the field from the dust outlet 23 at the rear of the threshing unit 9 by the transporting action of the handling cylinder 21.

  On the upper side of the handling cylinder 21, a plurality of dust feed valves (not shown) for adjusting the transport speed of threshing material in the handling chamber of the threshing unit 9 are pivotably connected. The conveyance speed (residence time) of thresh in the threshing unit 9 handling room can be adjusted by adjusting the angle of the dust valve in accordance with the variety and properties of the harvested grain culm. On the other hand, as the grain sorting mechanism 10 arranged below the threshing unit 9, a swing sorting machine 26 for specific gravity sorting having a grain pan, a chaff sheave, a grain sheave, a straw rack, and the like is provided.

  In addition, as the grain sorting mechanism 10, a Karamin fan 29 for supplying a sorting wind to the swing sorting board 26 and the like are provided. The threshed by the threshing cylinder 21 and leaking from the receiving net 24 is subjected to the specific gravity sorting action of the rocking sorter 26 and the wind sorting action of the Karamin fan 29 to make the grain (the first thing such as fine granules). , A mixture of grains and straw (secondary grain such as grains with branch spikes), and straw wastes.

  A first conveyor mechanism 30 and a second conveyor mechanism 31 are provided below the swinging sorter 26 as the grain sorting mechanism 10. Grains (the first ones) dropped from the swinging sorter 26 by the swinging sorter 26 and the Karamin fan 29 are collected in the Glen tank 6 by the first conveyor mechanism 30 and the frying conveyor 32. The mixture of grain and straw (second product) is returned to the sorting start end side of the swing sorting machine 26 via the second conveyor mechanism 31 and the second reduction conveyor 33, and is re-sorted by the swing sorting machine 26. You. Straw chips and the like are configured to be discharged to a field through a dust outlet 23 at a rear portion of the traveling body 1.

  Further, as shown in FIGS. 1 to 3, the cab 5 is provided with a side column 39, a control column 41, and a driver seat 42 on which an operator sits. A control lever 43 for changing the course of the traveling body 1 is attached to the control column 41. The side column 39 includes an accelerator lever 40 for adjusting the rotation speed of the engine 5, a main transmission lever 44 and an auxiliary transmission lever 45 for switching the moving speed of the traveling machine 1, and a cutting clutch lever for driving or stopping the cutting unit 3. A threshing clutch lever 47 for driving or stopping the threshing unit 9 is provided. Further, a roof 49 for awning is attached to the upper side of the cab 5 via a sun visor support 48.

  As shown in FIGS. 1, 2, and 4, left and right track frames 50 are arranged on the lower surface side of the traveling body 1. The track frame 50 includes a driving sprocket 51 for transmitting the power of the engine 7 to the traveling crawler 2, a tension roller 52 for maintaining the tension of the traveling crawler 2, and a plurality of track rollers for holding the ground side of the traveling crawler 2 in the ground state. 53 and an intermediate roller 54 for holding the non-ground side of the traveling crawler 2. The driving sprocket 51 supports the front side of the traveling crawler 2, the tension roller 23 supports the rear side of the traveling crawler 2, the track roller 53 supports the ground side of the traveling crawler 2, and the intermediate roller 54 prevents the traveling crawler 2 from moving. It is configured to support the ground side.

  The body structure of the combine will be described with reference to FIGS. 1 to 4, 9, and 12. The engine 7 is mounted on the upper surface on the right side of the front part of the traveling body 1, and the transmission case 63 is arranged on the front part of the traveling body 1 on the left side of the engine 7. The traveling body 1 includes left and right front and rear extension frames 64a and 64b of the same square pipe shape extending in the front and rear direction, and front and rear left and right extension frames 65a and 65b of the same square pipe shape extending in the left and right direction. Prepare. The left and right front and rear extension frames 64a and 64b are fixed to the left and right ends of the front and rear left and right extension frames 65a and 65b by welding. The working unit mounting frame 66 is fixed to the upper surfaces of the left and right front and rear extending frames 64 by welding. On the upper surface side of the working portion mounting frame 66, the working portion of the combine (the cutting unit 3, the cab 5, the Glen tank 6, the engine 7, the threshing unit 9) is arranged. The rear side of the transmission case 63 is connected to the front of the working unit mounting frame 66 via a transmission support frame 67.

  As shown in FIGS. 4, 8, 9, and 12, a pair of left and right front support frames 68a, 68b and a pair of left and right rear support frames 69a, 69b are provided. A pair of right and left track frames 50 are connected to the traveling body 1 (front and rear extension frames 64a and 64b, left and right extension frames 65a and 65b) via front support leg frames 68a and 68b and rear support leg frames 69a and 69b. The pair of left and right track frames support the traveling crawler 2 as a pair of left and right traveling units. As shown in FIGS. 4 and 9, the front support leg frames 68 a and 68 b include divergent left and right front support legs 71 a and 71 b having a large left-right width at the lower end when viewed in the front-rear direction of the traveling body 1. Left and right front auxiliary supporting legs 72a, 72b extending along the outer side surfaces of the supporting legs 71a, 71b, and left and right connecting front and rear extending frames 64a, 64b and rear surfaces of the front supporting legs 71a, 71b. The front reinforcing plates 73a and 73b are provided. The front end sides of the left and right track frames 2 are integrally connected to the lower left and right sides of the traveling body 1 via the front support legs 71a, 71b, the front auxiliary support legs 72a, 72b, and the front reinforcing plates 73a, 73b. Let it.

  As shown in FIGS. 4 and 9, left and right axle cases 74 extend from the transmission case 63 toward the outside of the left and right planes, and the left and right case brackets 75 extend forward from the front ends of the left and right track frames 2. Are respectively protruded, and the outer end portions of the left and right axle cases 74 are supported on the front end sides of the left and right case bracket bodies 75. The left and right drive sprockets 51 are disposed at the outer ends of the left and right axle cases 74 via left and right axles 63a extending from the transmission case 63. The lower ends of the front support legs 71a, 71b are integrally fixed to the side surface of the track frame 50 and the side surface of the case bracket body 75 by welding, and the front auxiliary support leg 72a is mounted on the flat upper surface of the case bracket body 75. , 72b are integrally surface-pressed by welding.

  On the other hand, as shown in FIG. 4, FIG. 9, and FIG. 12, a part of the upper end side end surfaces of the front support legs 71a, 71b is provided on the lower surface side of the front and rear extension frames 64a, 64b via the front pressure receiving frame 77. The upper end surfaces of the auxiliary supporting legs 72a and 72b are fixed by welding, and the upper ends of the front supporting legs 71a and 71b are fixed to the front left and right extending frames 65a by welding. The upper side of the middle portion of the front upper reinforcement frame 76 in the left and right width direction is fixed to the lower surface side of the left and right extension frame 65a by welding, and the front left and right front support legs 71a and 71b are attached to the inner side surfaces at the upper end sides. The upper surfaces at the left and right ends of the upper reinforcing frame body 76 are fixed by welding.

  As shown in FIG. 4 to FIG. 8 and FIG. 10 to FIG. 14, the rear supporting leg frames 69a and 69b have divergent left and right rear supporting legs 81a and 81b whose left and right widths are large when viewed in the front-back direction of the traveling body 1. Right and left rear auxiliary legs 82a and 82b extending along the outer side surfaces of the rear legs 81a and 81b, and left and right connected to the front sides of the front and rear extending frames 64a and 64b and the rear legs 81a and 81b. And left and right rear reinforcing plates 84a and 84b connected to the rear surfaces of the front and rear extending frames 64a and 64b and the rear supporting legs 81a and 81b. The rear left and right track frames 2 are located below the left and right sides of the traveling body 1 via rear supporting legs 81a, 81b, rear auxiliary supporting legs 82a, 82b, front reinforcing plates 83a, 83b, and rear reinforcing plates 84a, 84b. The ends are integrally connected.

  As shown in FIGS. 4 and 13, right and left tension brackets 86 are erected at the rear ends of the left and right track frames 2, and a pair of tension shafts are provided on the outer surface of the tension bracket 86 via a tension guide 87. A body 88 is disposed so as to be able to move back and forth, and the tension roller 52 is rotatably supported at the rear end side of the tension shaft body 88, while a front end of the tension shaft body 88 is connected to a tension guide body 87 via a tension adjusting bolt 89. The traveling crawlers 2 are stretched with a predetermined tension. As shown in FIGS. 8, 11, and 13, the lower ends of the rear support legs 81a and 81b are integrally fixed to the side surface of the track frame 50 and the side surface of the tension bracket body 86 by welding. The lower end sides of the rear auxiliary supporting legs 82a and 82b are integrally press-bonded to the flat upper surface by welding.

  On the other hand, as shown in FIGS. 10, 11, 13, and 14, a part of the upper end side end surfaces of the rear support legs 81 a and 81 b are provided on the lower surfaces of the front and rear extension frames 64 a and 64 b via the rear pressure receiving frame 90. The upper ends of the rear auxiliary legs 82a and 82b are fixed by welding, and the upper ends of the rear legs 81a and 81b are fixed to the left and right extending frames 65b by welding. The upper surface side of the middle portion of the rear upper reinforcement frame 91 is fixed to the lower surface side of the left and right extension frame 65b by welding, and the rear upper reinforcement is attached to the inner side surfaces of the upper ends of the left and right rear support legs 81a and 81b. The upper surfaces of the left and right ends of the frame body 91 are fixed by welding. The upper half of the left and right end surfaces of the left and right extension frames 65a and 65b is brought into contact with the inner side surfaces of the front and rear extension frames 64a and 64b, and extends left and right below the lower surfaces of the front and rear extension frames 64a and 64b. Of the left and right end faces of the frames 65a and 65b, the lower half side end faces are protruded.

  As is clear from FIGS. 4 to 14, the front support legs 71a and 71b and the rear support legs 81a and 81b are formed of common parts having substantially the same shape. As shown in FIGS. 4 to 7, the front support legs 71 a and 71 b and the rear support legs 81 a and 81 b are formed by pressing into a U-shaped cross-sectional end surface in a side view. On the upper end side of the front supporting legs 71a, 71b (rear supporting legs 81a, 81b), the lower left side (of the left and right side ends) of the left and right sides of the front left and right extending frame 65a (the rear left and right extending frame 65b). (The lower half side end). The U-shaped upper ends of the front support legs 71a and 71b (rear support legs 81a and 81b) are fixed to the front and rear side surfaces of the front left and right extension frames 65a (rear left and right extension frames 65b) by welding.

  As shown in FIGS. 4, 8, and 9, the front upper reinforcing frame body 76 and the rear upper reinforcing frame body 91 are formed of common parts having substantially the same shape. The upper surface of the horizontal intermediate portion of the front upper reinforcing frame body 76 (the rear upper reinforcing frame body 91) is fixed to the lower surface of the front left and right extending frame 65a (the rear left and right extending frame 65b) by welding. I have. Both ends of the front upper reinforcing frame body 76 (the rear upper reinforcing frame body 91) are bent obliquely downward on the outside of the machine, and both ends of the front upper reinforcing frame body 76 (the rear upper reinforcing frame body 91) are formed. The bent upper surface is fixed to the U-shaped lower surface of the front support legs 71a, 71b (rear support legs 81a, 81b) by welding.

  4 to 14, the front auxiliary legs 72a, 72b and the rear auxiliary legs 82a, 82b are formed of common parts having substantially the same shape. 5, 13, and 14, the front and rear extension plates 64a and 64b and the front reinforcing plates 83a and 83b connected to the front sides of the rear support legs 81a and 81b are longer than the front and rear widths. The front and rear extension plates 64a, 84b connected to the rear sides of the support frames 64a, 64b and the rear support legs 81a, 81b are formed to have large front-rear widths, and the front and rear extension frames 64a, 84a at the front and rear portions of the rear support legs 81a, 81b are formed. The rigidity of the traveling machine body 1 can be ensured while the front and rear extension frames 64a and 64b can be reduced in weight, because the supporting load of the 64b is increased. Moreover, the lower sides of the front and rear left and right extending frames 65a and 65b are greatly opened, and the front reinforcing plates 73a and 73b, the front reinforcing plates 83a and 83b, and the rear reinforcing plates 84a and 84b are used. The inner surface of the traveling crawler 2 on the non-ground side is closed, and a space surrounded by the lower surface of the traveling body 1 and the left and right traveling crawlers 2 is formed in a tunnel shape. That is, the soil discharged from the bottom of the left and right traveling crawler 2 toward the inside of the machine (surface cultivated soil in the field, mud in the wetland) smoothly moves from the tunnel-shaped space to the rear of the machine and travels with the soil removed. It prevents the resistance from increasing and improves running performance in wet fields.

  With the above configuration, the U-shaped upper surface openings of the front support legs 71a, 71b (rear support legs 81a, 81b) are connected to the front pressure receiving frame 77 (rear pressure receiving frame 90) on the lower surfaces of the front and rear extension frames 64a, 64b. And the front left and right extension frames 65a (the rear left and right extension frames 65b) and the front auxiliary support members 72a and 72b (rear auxiliary support members 82a and 82b). As shown in FIG. 6, the dew condensation inside the rear supporting members 81a and 81b (front supporting members 71a and 71b) is performed at the lowermost end of the rear supporting members 81a and 81b (front supporting members 71a and 71b). It is configured to be dropped from the drain hole 92. Further, as shown in FIG. 4, the front reinforcing plates 73a and 73b and the front reinforcing plates 83a and 83b are formed in substantially the same shape.

  Further, as shown in FIG. 4, FIG. 9, FIG. 10, and FIG. 11, the thickness of the steel plate for forming the front support legs 71a and 71b (the rear support legs 81a and 81b) by pressing is larger than that of the steel plate. The thickness of the steel plate for forming the front auxiliary supporting members 72a and 72b (the rear auxiliary supporting members 82a and 82b) by pressing is increased, and the front supporting members 71a and 71b (the rear supporting members 81a and 82b) are formed. 81b) and the front support legs 72a, 72b (rear support legs 82a, 82b) can easily secure the front support strength (rear support strength) of the traveling body 1 while the front support legs 71a, The press workability of the 71b (the rear supporting members 81a, 81b) can be simplified, and the manufacturing cost can be reduced.

  Further, the front and rear auxiliary leg members 72a and 72b (the rear auxiliary leg members 82a and 82b) are formed to have a larger front and rear width size than the front and rear width members of the front leg members 71a and 71b (the rear leg members 81a and 81b). That is, the front ends of the front auxiliary legs 72a, 72b (rear auxiliary legs 82a, 82b) are projected forward of the front surfaces of the front legs 71a, 71b (rear legs 81a, 81b). The rear edges of the front auxiliary legs 72a, 72b (rear auxiliary legs 82a, 82b) protrude rearward of the rear surfaces of the section legs 71a, 71b (rear legs 81a, 81b).

  In addition, the vertical cutting end face is formed on the flat upper surface of the gate-shaped case bracket body 75 (tension bracket body 86), and the vertical cutting end face is formed with L-shaped front auxiliary leg portions 72a and 72b (rear auxiliary leg portions 82a and 82b). Are horizontally pressure-bonded integrally by welding. For example, the case bracket body 75 (tension bracket) may be compared with a structure in which the lower end surfaces of the front auxiliary leg bodies 72a and 72b (rear auxiliary leg bodies 82a and 82b) are welded to the case bracket body 75 (tension bracket body 86). The connection strength between the body 86) and the front auxiliary supporting members 72a, 72b (rear auxiliary supporting members 82a, 82b) can be easily improved.

  Further, a structure in which the lower ends of the front support legs 71a and 71b (rear support legs 81a and 81b) are welded and fixed only to the side surface of the track frame 50 and the side surface of the case bracket body 75 (tension bracket body 86) (FIGS. 9 and 10). In FIG. 11), a part of the lower end of the front support legs 71a, 71b (rear support legs 81a, 81b) is extended to the upper surface side of the case bracket body 75 (tension bracket body 86) and fixed by welding. As compared with the structure, the shape of the front support legs 71a, 71b (rear support legs 81a, 81b) can be simplified, and the manufacturing cost can be reduced.

  Next, a mounting structure of the diesel engine 7 will be described with reference to FIGS. 3, 4, 8, 9, and 12. Of the upper surface of the working portion mounting frame frame 66 erected on the left and right front and rear extension frames 64a and 64b, the right and left front upper surfaces between the front support legs 71a and 71b and the rear support legs 81a and 81b are provided. Are provided with front engine support brackets 97a and 97b and left and right rear engine support brackets 98a and 98b. The front engine support brackets 97a and 97b and the rear engine support brackets 98a and 98b support the engine 7 in a vibration-proof manner. The output of the engine 7 is transmitted to the Karino fan shaft of the threshing unit 9 via a threshing drive belt, and the output of the engine 7 is transmitted to the transmission case 63 via a traveling drive belt.

  As shown in FIGS. 1 to 14, a traveling body 1 having a traveling crawler 2 as a traveling unit and a driver's seat 42, a cutting unit 3 having a cutting blade 15, a threshing unit 9 having a handling drum 21, and a cutting unit 3 In addition, in the combine including the engine 7 that drives the threshing unit 9 and the like, the flared left and right support legs 71a, 71b or 81a, 81b whose right and left widths at the lower end side are large when viewed in the front-back direction of the traveling machine body 1, and the support legs 71a. , 71b or 81a, 81b are provided with left and right auxiliary legs 72a, 72b or 82a, 82b extending along the outer side surface of the vehicle. The left and right track frames 50 are connected to the right and left track frames 50 via auxiliary legs 72a, 72b or 82a, 82b. 2, a case bracket body 75 or a tension bracket body 86 as a support bracket body is provided on the upper surface side of the track frame 50, and the side surface of the track frame 50 and the side surface of the case bracket body 75 or the tension bracket body 86 are provided. And the lower ends of the auxiliary legs 72a, 72b or 82a, 82b are integrally formed on the flat upper surface of the leg bracket 75 or 86. It is crimped. Therefore, by fixing the side surface of the track frame 50 and the side surface of the case bracket body 75 or the tension bracket body 86 to the lower ends of the support legs 71a, 71b or 81a, 81b, it is possible to mainly cope with the deformation force in the left-right direction. By fixing the flat upper surface of the case bracket body 75 or the tension bracket body 86 to the lower end sides of the auxiliary support legs 72a, 72b or 82a, 82b, it is possible to mainly cope with a vertical deformation force. The connecting portions of the track frame 50 and the lower ends of the legs 71a, 71b or 81a, 81b can be easily reinforced by the auxiliary legs 72a, 72b or 82a, 82b. That is, it is possible to easily secure the connection strength between the track frame 50 and the lower ends of the support legs 71a, 71b or 81a, 81b, easily secure the connection rigidity between the traveling machine body 1 and the track frame 50, and to support the support legs 71a, 71b or 81a. , 81b can be manufactured at a reduced cost, and the weights of the legs 71a, 71b or 81a, 81b can be reduced.

  As shown in FIGS. 4 to 14, the case bracket body has a structure in which the front-rear width dimension of the auxiliary support legs 72 a, 72 b or 82 a, 82 b is larger than the front-rear width dimension of the support legs 71 a, 71 b or 81 a, 81 b. The lower ends of the auxiliary support legs 72a, 72b or 82a, 82b are surface-pressed to the flat upper surface of the tension bracket body 75 or the tension bracket body 86. Therefore, compared to the conventional structure in which the lower end surfaces of the auxiliary support members 72a, 72b or 82a, 82b are joined to the track frame 50, the connection strength between the track frame 50 and the auxiliary support members 72a, 72b or 82a, 82b is easily increased. Can be secured. For example, the support legs 71a, 71b or 81a, 81b are manufactured by sheet metal working in which the cross-sectional end surfaces of the support legs 71a, 71b or 81a, 81b are formed in a U shape, and the support legs 71a, 71b or 81a, 81b are manufactured. In a structure in which the upper surface side (U-shaped opening) is closed by the auxiliary support members 72a, 72b or 82a, 82b to form a cylindrical shape, the auxiliary support member 72a is formed by using an iron rigid plate material having a greater plate thickness than before. , 72b or 82a, 82b, the rigidity of the connecting portion between the track frame 50 and the lower ends of the legs 71a, 71b or 81a, 81b can be easily improved by the auxiliary legs 72a, 72b or 82a, 82b. Since it is not necessary to form the legs 71a, 71b or 81a, 81b using a thick steel plate material, it is possible to easily reduce the weight or cost of the legs 71a, 71b or 81a, 81b. .

  As shown in FIGS. 4 to 14, the structure has front and rear extension frames 64 a and 64 b forming the traveling body 1, and is supported on the lower surface side of the front and rear extension frames 64 a and 64 b via the pressure receiving frame body 77 or 90. A part of the upper end side of the body 71a, 71b or 81a, 81b is fixed to the upper end side of the auxiliary leg 72a, 72b or 82a, 82b. Therefore, the lower surface side of the pressure receiving frame 77 or 90 is fixed to a part of the upper end side end surface of the supporting leg 71a, 71b or 81a, 81b and the upper end side end surface of the auxiliary supporting leg 72a, 72b or 82a, 82b by welding. Later, the pressure receiving frame body 77 or 90 is fixed to the front and rear extension frames 64a and 64b by welding, and the upper ends of the support legs 71a and 71b or 81a and 81b are provided on the lower surfaces of the front and rear extension frames 64a and 64b. A part can be connected to the upper ends of the auxiliary support members 72a, 72b or 82a, 82b, and the workability of the welding process can be improved. For example, after welding the lower ends of the supporting legs 71a, 71b or 81a, 81b and the lower ends of the auxiliary supporting legs 72a, 72b or 82a, 82b to the upper surface of the track frame 50, the lower surfaces of the front and rear extending frames 64a, 64b are welded. The pressure receiving frame 77 or 90 can be welded to the upper side, and the upper ends of the supporting legs 71a, 71b or 81a, 81b and the upper ends of the auxiliary supporting legs 72a, 72b or 82a, 82b are provided on the lower surfaces of the front and rear extending frames 64a, 64b. Welding work for connection can be simplified.

  As shown in FIGS. 4 to 14, the front and rear extension frames 64 a and 64 b and the left and right extension frames 65 a and 65 b forming the traveling body 1 are provided, and the support legs are attached to the front and rear extension frames 64 a and 64 b and the left and right extension frames 65 a and 65 b. A structure for fixing the upper ends of the bodies 71a, 71b or 81a, 81b, wherein the upper surface of the middle portion of the upper reinforcing frame 76 or 91 is fixed to the lower surfaces of the left and right extending frames 65a, 65b. The upper reinforcement frame 76 or 91 is fixed to the upper left and right ends on the inner side surface at the upper end of the support legs 71a, 71b or 81a, 81b. Therefore, the upper ends of the left and right legs 71a, 71b or 81a, 81b are fixed to the lower surfaces of the left and right extending frames 65a, 65b in a state where the upper ends of the left and right legs 71a, 71b or 81a, 81b are separated. It is possible to simplify the welding work for connecting the left and right support legs 71a, 71b or 81a, 81b to the left and right extension frames 65a, 65b, while maintaining the lower and right sides of the left and right extension frames 65a, 65b. The connection rigidity on the upper end side of the supporting legs 71a, 71b or 81a, 81b is easily secured by the upper reinforcing frame body 76 or 91, and the left and right extending frames 65a, 65b and the left and right supporting legs 71a, 71b or 81a, 81b can easily secure the connection rigidity.

  As shown in FIGS. 4 to 14, front and rear extending frames 64a and 64b which form the traveling body 1 are provided, and front reinforcing plates 83a and 83b are provided on the front sides of the front and rear extending frames 64a and 64b and the rear supporting legs 81a and 81b. And the rear reinforcing plates 84a, 84b are connected to the front surfaces of the front and rear extending frames 64a, 64b and the rear supporting legs 81a, 81b. Since the front and rear widths of the rear reinforcing plate members 84a and 84b are made larger than those of the rear reinforcing plate members 84a and 84b, the front and rear extension members 81a and 81b can be simplified and the manufacturing cost can be reduced. The support load of the frames 64a and 64b can be easily secured.

  Next, the mounting structure of the mudguard cover 85 will be described with reference to FIGS. As shown in FIGS. 15 to 19, the vehicle 1 includes front and rear extension frames 64 a and 64 b and left and right extension frames 65 a and 65 b that form the traveling body 1, and supports the front and rear extension frames 64 a and 64 b and the left and right extension frames 65 a and 65 b. The upper ends of the bodies 81a, 81b (71a, 71b) are fixed. Front reinforcing plates 83a and 83b are connected to the front sides of the front and rear extending frames 64a and 64b and the supporting members 81a and 81b (71a and 71b), and the front and rear extending frames 64a and 64b and the rear supporting members 81a and 81b (71a and 81b). 71b) The rear reinforcing plate members 84a and 84b are connected to the rear surface side. A mudguard cover 85 for covering the front surfaces of the left and right extending frames 65a and 65b is provided between the working portion mounting frame frame 66 on the front and rear extending frames 64a and 64b and the front reinforcing plates 83a and 83b. In harvesting work in a wetland (fukada) where the traveling crawler 2 sinks greatly in the mud, it is possible to eliminate the problem that mud in the field is deposited on the front side of the left and right extending frames 65a, 65b. The running resistance caused by the accumulation of mud is easily reduced.

  The mudguard cover body 85 has a central cover 181 for fastening upper and lower ends to the left and right extending frame 65b and the working unit mounting frame frame 66, and left and right side covers 182 for fastening and fixing one end to the central cover 181. . A space between the left and right extending frames 65b and the working unit mounting frame 66 is closed by a central cover 181. The other ends of the left and right side covers 182 are fastened and fixed to the front reinforcing plates 83a and 83b, and the space between the front reinforcing plates 83a and 83b and the left and right ends of the center cover 181 is closed by the left and right side covers 182. I have. That is, the center cover 181 and the left and right side covers 182 are extended between the front and rear extending frames 64a and 64b, the left and right extending frames 65a and 65b (working frame frame 66), and the front reinforcing plates 83a and 83b. The center cover 181 and the left and right side covers 182 form a tunnel-shaped space when viewed from the front, and mud in the field that enters between the left and right rear support legs 81a and 81b below the working unit mounting frame frame 66, It is configured to smoothly move rearward by the guidance of the mudguard cover body 85.

  The front and rear widths of the upper surface of the upper bracket 183 are provided on the lower surfaces of the left and right extending pipes 66a of the working portion mounting frame frame 66 extending in parallel above the left and right extending frames 65b. The middle part is fixed by welding. The front and rear ends of the upper bracket 183 are projected in the front and rear downward direction of the left and right extending pipe 66a, and the upper end side of the central cover 181 is fastened to the front end of the upper bracket 183 by bolts 184. That is, the upper end side of the central cover 181 is detachably fixed to the left and right extending pipes 66a via the upper bracket 183. On the other hand, a rear cover 185 is fastened to the rear end of the upper bracket 183 by bolts 186. That is, the rear cover 185 is detachably fixed to the left and right extending pipe 66a via the upper bracket 183, and the gap between the left and right extending frame 65b and the left and right extending pipe 66a is closed by the rear cover 185. The mud soil is prevented from entering from the upper surface side of the left and right extending frame 65b toward the rear surface of the central cover 181.

  As shown in FIG. 17, similar to the structure of the mudguard cover body 85 provided on the rear left and right extending frames 65b shown in FIGS. 15, 16, 18, and 19, the front left and right extending frames 65a and A mudguard cover 85 is provided between the left and right extending pipes 66a extending in parallel above the left and right extending frames 65a, and a tunnel-shaped space is formed by the mudguard cover 85 in a front view. The mud of the field that enters between the left and right front support legs 71a and 71b below the 66 is smoothly moved rearward by the guidance of the mudguard cover 85.

  In addition, left and right side covers 182 are fastened to the left and right ends of the center cover 181 with bolts 187. The left and right side covers 182 and the left and right front reinforcing plates 83a and 83b are fastened with bolts 188. The lower bracket 189 is fixed to the front surface of the rear left and right extension frame 65b by welding. The mounting bracket 190 is fastened to the center cover 181 and the side cover 182 by bolts 187. The intermediate bracket 191 is fastened to the lower bracket 189 and the mounting bracket 190 by bolts 192 and 193. That is, the lower end side of the central cover 181 is detachably fixed to the left and right extending frame 65 b via the lower bracket 189.

  Next, a structure for preventing the traveling crawler 2 from coming off will be described with reference to FIGS. As shown in FIGS. 20 and 21, a tension adjusting bolt 89 and a tension adjusting nut 89a for maintaining the traveling crawler 2 at a predetermined tension are provided, and tension is applied to the tension guide body 87 via the tension adjusting bolt 89 and the tension adjusting nut 89a. The front end side of the shaft body 88 is connected, and the support position of the tension roller 52 on the rear end side of the tension shaft body 88 can be displaced in the machine body front-rear direction by the longitudinal movement operation of the tension shaft body 88. The tension adjusting bolt 89 as a tension member is provided with a notch groove 89b for breaking a stone bite, and a notch groove 89b is formed in the middle of the connection of the tension adjusting bolt 89 (between the tension guide body 87 and the tension shaft body 88). doing. When a stone or the like enters between the traveling crawler 2 and the tension roller 52 and the traveling crawler 2 is abnormally tensioned, the cut groove 89b of the tension adjusting bolt 89 is broken before the traveling crawler 2 is broken, and the traveling crawler is broken. The tension roller 52 moves in the direction in which the tension of the vehicle 2 decreases (the front of the fuselage), thereby preventing damage to the traveling crawler 2 from breaking.

  As shown in FIGS. 20 and 21, a bearing plate 211 is provided on the rear end side of the tension shaft 88, a roller shaft 212 is fixed to the bearing plate 211, and the tension roller 52 is rotatably mounted on the roller shaft 212. Support. A core metal body 213 is embedded in the traveling crawler 2, and a pair of left and right core metal guide portions 213 a of the core metal body 213 is protruded on the inner peripheral side of the traveling crawler 2. A pair of right and left core metal guides 213a of the right and left 213 abut on each other so as to appropriately maintain the winding posture of the traveling crawler 2 with respect to the driving sprocket 51 or the tension roller 52.

  Further, a crawler detachment prevention member 214 is provided on a bearing plate 211 serving as a support member of the tension roller 52. The rear end side of the crawler disengagement prevention body 214 is fastened to the bearing plate body 211 with a bolt 215. Of the plurality of track rollers 53 provided on the track frame 50, the front end side of the crawler detachment prevention body 214 is extended between the left and right rolling elements 216 of the rearmost track roller 53a, and the front end side of the crawler detachment prevention body 214 A pair of left and right core metal guides 213a is configured to be supported between the left and right rolling elements 216 (see FIG. 21). For example, when a stone or the like enters between the tension roller 52 and the traveling crawler 2 and the traveling crawler 2 is abnormally tensioned and the tension adjusting bolt 89 (tension member) is broken, the tension roller 52 is moved from a predetermined support position to the front of the machine body. When the traveling crawler 2 moves to the side, the crawler detachment preventing body 214 also moves, so that the traveling crawler 2 can be prevented from detaching. While the breakage of the traveling crawler 2 can be easily prevented, the broken portion of the tension member can be smoothly repaired by replacing the tension adjusting bolt 89 or the like.

  FIG. 22 shows a modified example of the structure for preventing the traveling crawler 2 from coming off. As shown in FIG. 22, a crawler coming-off prevention wheel 217 is provided between the left and right rolling bodies 216 of the second track roller 53b from the rear end. A pair of left and right core metal guides 213a is configured to be supported between the left and right rolling elements 216 and the crawler separation prevention wheel 217. For example, when a stone or the like enters between the tension roller 52 and the traveling crawler 2, Even if the traveling crawler 2 is abnormally tensioned and the tension adjusting bolt 89 (tension member) is broken, the core metal guide portion 213a abuts on the left and right rolling elements 216 and the crawler disengagement prevention wheel 217, and from the rearmost portion. The lateral displacement movement of the traveling crawler 2 with respect to the second track roller 53b is prevented, so that the traveling crawler 2 can be prevented from coming off, and the crawler detachment preventing body 2 can be prevented. 4 of the forward movement space easily be secured, the crawler detachment prevention member 214 can be moved smoothly to the front side. In addition, a crawler detachment prevention frame 218 is disposed in front of the second track roller 53b from the last, and the crawler detachment prevention frame 218 is fastened and fixed to the track frame 50, and a crawler detachment prevention frame is provided between the left and right metal core guides 213a. 218 is supported, and the core metal guide portion 213a abuts on the crawler detachment prevention frame 218, so that the lateral movement of the traveling crawler 2 is prevented.

  FIG. 23 shows a modification of the structure for preventing the traveling crawler 2 from coming off. As shown in FIG. 23, the rear end side of the crawler coming-off prevention frame 218 is branched into a forked shape to form a crawler coming-off prevention arm 218a. Then, a bifurcated crawler disengagement prevention arm 218a is extended to the side of the tension roller 52. That is, of the plurality of sets of core metal guides 213a provided on the inner peripheral side of the traveling crawler 2, a bifurcated crawler is provided on the outer side of the core metal guide 213a between the tension roller 52 and the last track roller 53a. The detachment prevention arm 218a is extended. For example, even if a stone or the like enters between the tension roller 52 and the traveling crawler 2 and the traveling crawler 2 is abnormally tensioned and the tension adjusting bolt 89 (tension member) is broken, the core metal guide portion 213a prevents the crawler from coming off. By contacting the arm 218a, the lateral movement of the traveling crawler 2 is prevented, and the traveling crawler 2 can be prevented from coming off.

  Next, the mounting structure of the movable guide roller 221 as a movable rolling wheel will be described with reference to FIGS. As shown in FIGS. 25 and 26, a base frame 222 is erected on the track frame 50, and one end side of a roller arm 224 as a support frame can be rotated on the base frame 222 via an arm fulcrum shaft 223 as a wheel axis. The movable guide roller 221 is rotatably supported at the other end of the roller arm 224. The pinch spring 225 is urged to the roller arm 224, and the movable guide roller 221 is elastically supported on the inner peripheral surface of the traveling crawler 2 on the ground side by the pinch spring 225 force. A lower movement stopper 226 fixed to the track frame 50 is provided. The lower movement stopper 226 is brought into contact with the lower surface side of the roller arm 224, and the lower movement range of the movable guide roller 221 by the force of the sandwiching coil spring 225 is regulated by the lower movement stopper 226. doing.

  As shown in FIG. 26, a collar 227 is fitted to the arm fulcrum shaft 223, and a boss 230 is fitted to the outer periphery of the collar 227 via a bush 228 and a dust seal 229. In addition, the boss 230 is fixed to the roller arm 224, the bolt 232 is screwed to the arm fulcrum shaft 223 via the seat plate 231, and the roller arm 224 is supported on the arm fulcrum shaft 223 via the collar 227 and the boss 230. The roller arm 224 (support frame) is rotatably supported on the arm fulcrum shaft 223 (wheel shaft) via the collar 227 so that wear of the arm fulcrum shaft 223 can be reduced, and the arm fulcrum shaft 223 is replaced. It is configured to delay the time of troublesome repair work such as.

  Next, the structure of the drive sprocket 51 will be described with reference to FIGS. As shown in FIGS. 27 to 30, the driving sprocket 51 is detached from a disk-shaped driving rotator 236 that is spline-fitted to an axle 235 extending in the left-right direction from the transmission case 63 and a hub-shaped driving rotator 236. It is formed from a split sprocket body 238 having a split shape to be fastened with a bolt 237 as much as possible. The drive sprocket 51 is formed by fixing two divided sprocket bodies 238 in a circular shape on the outer peripheral side of the drive rotating body 236. Also, a plurality of sprocket engagement holes 239 are formed at equal pitches in the left and right center portions between the adjacent metal core members 213 in the left and right center portions of the endless track of the traveling crawler 2, and the sprocket of the traveling crawler 2 is formed. The tooth portion 241 of the split sprocket body 238 meshes with the engagement hole 239, and the traveling crawler 2 is wound around about half of the outer peripheral side of the drive sprocket 51.

  Further, as shown in FIG. 29, of the plurality of tooth portions 241 of the divided sprocket body 238 formed at equal intervals on the outer peripheral surface of the driving sprocket 51, each of the two divided sprocket bodies 238 facing each other at an interval of 180 degrees. A normal rotation side detection groove 242 and a reverse rotation side detection groove 243 are provided in the detection tooth portion 241a. That is, a part of the tooth portion 241 of the driving sprocket 51 is meshed with the traveling crawler 2, and the outer surface of the tooth portion 241 a for detecting the meshing position and the outer surface of the detecting tooth portion 241 a for the non-meshing position are formed. A forward rotation side detection groove 242 and a reverse rotation side detection groove 243 as wear detection grooves are formed.

  As a result, one of the detection tooth portions 241a of the two split sprocket bodies 238 meshes with the sprocket engagement hole 239, and one of the detection tooth portions 241a is visible from the outside of the machine. It is composed. When the detection claw 241a meshes with the sprocket engagement hole 239 in the forward driving state of the traveling crawler 2, the side of the detection claw 241a in which the normal rotation side detection groove 242 is formed has a sprocket engagement hole. The 239 edge is in contact with the side of the core metal body 213, and the side of the detection tooth portion 241a that is in contact with the side of the core metal body 213 is unevenly worn due to temporal use. The operator can properly sense the replacement time of the drive sprocket 51, and it is possible to prevent running troubles occurring in the field due to the local wear of the teeth 241 of the drive sprocket 51.

  In the combine where the harvesting operation is performed in the forward running, the side of the detection tooth portion 241a in which the normal rotation side detection groove 242 is formed is compared with the side of the detection tooth portion 241a in which the reverse rotation side detection groove 243 is formed. When the side portion of the detection tooth portion 241a is unevenly worn down to the normal rotation side detection groove 242, the unevenness of the detection tooth portion 241a (tooth portion 241) is visually observed by an operator. Wear can be confirmed. When uneven wear of the detection teeth 241a (teeth 241) is confirmed, as shown in FIG. 30, the left and right driving sprockets 51 (two divided sprocket bodies 238) are replaced by a left and right rotation. When the left and right driving sprockets 51 are replaced, in the forward running in which the harvesting operation is performed, the side of the detection tooth portion 241 a in which the reverse rotation side detection groove 243 is formed is located on the side of the core metal body 213 on the edge of the sprocket engagement hole 239. Parts. The left and right driving sprockets 51 are formed by forming a wear detection groove (forward rotation detection groove 242) for detecting wear on the forward rotation side and a wear detection groove (reverse rotation detection groove 243) for detecting wear on the reverse rotation side. There is no need to replace the drive sprocket with a new drive sprocket during the rotation work, and the cost of repair parts can be reduced.

  With the above configuration, the operator can easily check the drive sprocket 51 visually, and the right and left rotation replacement work for replacing the left and right drive sprockets 51 is performed at an appropriate timing. It can be extended, running costs can be reduced, and troubles in the field that occur during harvesting can be prevented. When both the side of the detection tooth 241a in which the normal rotation side detection groove 242 is formed and the side of the detection tooth 241a in which the reverse rotation side detection groove 243 is formed are worn, the driving sprocket 51 Is exchanged for a new one.

  Next, with reference to FIGS. 31 to 34, a description will be given of a mounting structure of a crawler detachment prevention frame 218 as a crawler guide body that causes the track roller 53 to support the traveling crawler 2 in an appropriate posture. As shown in FIGS. 31 to 34, a crawler detachment prevention frame 218 is arranged at the rear end of the track frame 50, and the crawler detachment prevention frame 218 extends from the third track roller 53 from the rearmost to the last track roller 53. The traveling crawler 2 is prevented from moving laterally by the abutment of the core metal guide portion on the inner peripheral surface of the traveling crawler 2 and the crawler disengagement prevention frame 218, and the inner peripheral surface of the traveling crawler 2 on the ground side is It is configured to come into contact with the reference numeral 53 in an appropriate posture.

  As shown in FIGS. 31 to 34, the front end side of the crawler disengagement prevention frame 218 extends in the direction of the third track roller 53 from the rearmost portion, and is screwed to the bolt receiving shaft 250 at the rear end of the track frame 50. A rotation fulcrum bolt 251 is provided, and the front end side of the crawler disengagement prevention frame 218 is rotatably supported on the track roller 53 via the rotation fulcrum bolt 251, and the crawler disengagement prevention frame 218 is centered on the rotation fulcrum bolt 251. Is supported so as to be able to move up and down. Further, the rear end of the crawler detachment prevention frame 218 extends in the direction of the rearmost track roller 53, and the rear end of the crawler detachment prevention frame 218 protrudes rearward of the rearmost track roller 53. The crawler disengagement prevention frame 218 is supported with the rear end approaching.

  In addition, the fixed shaft 252 is fixed to the rear end of the track frame 50, and the upward projection 253 is integrally formed on the rear end of the crawler detachment prevention frame 218, and is fixed to the U-shaped groove 254 of the upward projection 253. The shaft 252 is fitted so as to be able to be inserted and removed, and the upward projection 253 is fixedly supported on the fixed shaft 252 via a shear pin body 255 that can be broken by a predetermined load. For example, when a stone or the like enters between the tension roller 52 and the traveling crawler 2 and the traveling crawler 2 is abnormally tensioned and the tension adjusting bolt 89 (tension member) is broken, the tension roller 52 is moved from a predetermined support position to the front of the machine body. Side, and when the tension roller 52 abuts against the rear end of the crawler detachment prevention frame 218, the shear pin body 255 is broken before the tension roller 52 or the crawler detachment prevention frame 218 is damaged. ing.

  That is, when the tension adjusting bolt 89 (tension member) breaks due to abnormal tension of the traveling crawler 2 and the tension roller 52 comes into contact with the rear end of the crawler detachment prevention frame 218, the shear pin body 255 breaks and the crawler The detachment prevention frame 218 is pushed down, so that the breakage of the traveling crawler 2 or the damage of the tension roller 52 or the crawler detachment prevention frame 218 can be easily prevented, while the tension adjustment bolt 89 is replaced. Thus, the damaged portion of the tension member can be smoothly repaired.

  As shown in FIGS. 1 to 14, a traveling body 1 having a traveling crawler 2 as a traveling unit and a driver's seat 42, a cutting unit 3 having a cutting blade 15, a threshing unit 9 having a handling drum 21, and a cutting unit 3 And a combine provided with an engine 7 for driving the threshing unit 9 and the like, including front and rear extension frames 64a and 64b forming the traveling body 1, and front and rear sides of the front and rear extension frames 64a and 64b and rear support legs 81a and 81b. This is a structure in which the reinforcing plates 83a and 83b are connected, and the rear reinforcing plates 84a and 84b are connected to the front surfaces of the front and rear extending frames 64a and 64b and the rear supporting legs 81a and 81b. , 83b are formed larger than the front-rear widths of the rear reinforcing plate members 84a, 84b. Accordingly, the connection strength between the front and rear extension frames 64a and 64b and the rear support legs 81a and 81b can be easily secured, and the connection rigidity between the traveling body 1 (front and rear extension frames 64a and 64b) and the track frame 50 can be easily secured. In addition, manufacturing costs such as sheet metal processing of the rear support legs 81a and 81b can be reduced, and the weight of the rear support legs 81a and 81b can be reduced.

  As shown in FIG. 15 to FIG. 19, the vehicle includes a front and rear extension frame 64a, 64b and a left and right extension frame 65b which form the traveling body 1, and the front and rear extension frames 64a, 64b and the left and right extension frame 65b have the rear support legs. A structure in which the upper ends of the left and right extending frames 65b are fixed between the working portion mounting frame 66 on the front and rear extending frames 64a and 64b and the front reinforcing plates 83a and 83b. A mudguard cover 85 for covering the side is stretched. Therefore, even when a large amount of mud in the field moves to the front side of the left and right extending frame 65b in wetland work or the like, the left and right extending frame 65b is guided toward the rear of the left and right extending frame 65b by the guide of the mudguard cover 85. A large amount of mud on the front side of the front side 65b can be smoothly discharged, and the problem that mud on the field is accumulated on the front side of the left and right extending frame 65b can be eliminated, and the running resistance due to the accumulation of mud on the field can be easily reduced.

  As shown in FIGS. 20 and 21, the traveling crawler 2 is provided as the traveling section, and the traveling crawler 2 is stretched on the track frame 50 via the driving sprocket 51 and the tension roller 52. A crawler detachment prevention member 214 is provided on a bearing plate 211 serving as a support member. Therefore, even if a stone or the like enters between the tension roller 52 and the traveling crawler 2 and the traveling crawler 2 is abnormally tensioned and the tension member (tension adjusting bolt 89) is damaged, the tension roller 52 moves from the predetermined support position. At this time, the crawler detachment preventing body 214 also moves, so that the traveling crawler 2 can be prevented from coming off. The breakage of the tension member (tension adjusting bolt 89) can be smoothly repaired while the traveling crawler 2 can be easily prevented from being broken.

  As shown in FIGS. 25 and 26, the traveling crawler 2 is provided as the traveling section, and the traveling crawler 2 is stretched on the track frame 50 via a driving sprocket 51, a tension roller 52, and a movable guide roller 221 as a movable rolling wheel. A roller arm 224 as a support frame of the movable guide roller 221 is rotatably supported on an arm fulcrum shaft 223 as a wheel shaft fixed to the track frame 50 via a collar 227. I have. Therefore, the wear of the arm fulcrum shaft 223 can be reduced, and the time of troublesome repair work such as replacement of the arm fulcrum shaft 223 can be easily delayed.

  As shown in FIGS. 27 to 30, the traveling crawler 2 is provided on the track frame 50 via the driving sprocket 51, and a plurality of traveling crawlers 2 are provided on the outer peripheral surface of the driving sprocket 51. The teeth 241 are formed at equal intervals, and a part of the teeth 241 of the driving sprocket 51 is meshed with the traveling crawler 2. A normal rotation side detection groove 242 or a reverse rotation side detection groove 243 as a wear detection groove is formed on the outer surface of the position detection tooth portion 241a. Therefore, the operator can properly know the time to replace the drive sprocket 51, and it is possible to prevent running troubles occurring in the field due to the local wear of the teeth 241 of the drive sprocket 51. Further, by forming a normal rotation side detection groove 242 as a wear detection groove for detecting wear on the normal rotation side and a reverse rotation side detection groove 243 as a wear detection groove for detecting wear on the reverse rotation side, respectively. It is not necessary to replace the driving sprocket 51 with a new driving sprocket in the rotation work, and the cost of repair parts can be reduced.

1 traveling body 2 traveling crawler (traveling part)
3 Cutting unit 7 Engine 9 Threshing unit 15 Cutting blade 21 Handle cylinder 42 Driver seat 50 Track frame 51 Drive sprocket 52 Tension roller 64a Left front-rear extension frame 64b Right front-rear extension frame 65b Right and left extension frame 66 Working unit Mounting frame 81a Left rear leg 81b Right rear leg 83a Left front reinforcing plate 83b Right front reinforcing plate 84a Left rear reinforcing plate 84b Right rear reinforcing plate 85 Mudguard cover 211 Bearing plate (support member)
214 Crawler detachment prevention body 221 Movable guide roller (movable rolling wheel)
223 Arm fulcrum axis (wheel axis)
224 Roller arm (support frame)
227 Collar 242 Forward rotation side detection groove (wear detection groove)
243 Reverse rotation side detection groove (wear detection groove)

Claims (4)

A traveling body having a traveling unit and a driver's seat, a cutting unit having a cutting blade, a threshing unit having a handling drum, and a combine including an engine that drives the cutting unit and the threshing unit,
A front and rear extending frame and a left and right extending frame forming the traveling body; an upper end of a rear support leg fixed to the front and rear extending frame and the left and right extending frame; and the front and rear extending frame and the rear portion. A front reinforcing plate is connected to the front side of the supporting leg, and a rear reinforcing plate is connected to the front and rear extending frame and the rear side of the rear supporting leg, and the front and rear width dimensions of the front reinforcing plate are compared. Also form a large front and rear width dimension of the rear reinforcing plate,
A mudguard cover body for covering the front side of the left and right extending frame is stretched between the working unit mounting frame frame on the front and rear extending frame and the front reinforcing plate,
The mudguard cover body closes a space between the left and right extending frames and the working portion mounting frame frame, and closes a space between the front reinforcing plate body and the left and right ends of the center cover. And a left and right side cover, wherein the central cover and the left and right side covers form a tunnel- shaped space in a front view below the working portion mounting frame frame body.   A structure in which the traveling crawler is provided as the traveling portion, the traveling crawler is stretched on a track frame via a driving sprocket and a tension roller, and a crawler detachment prevention member is provided on a support member of the tension roller. The combine according to claim 1, wherein   It is provided with a traveling crawler as the traveling portion, and has a structure in which the traveling crawler is stretched on a track frame via a driving sprocket, a tension roller, and a movable rolling wheel, and a collar is mounted on a rolling wheel shaft fixed to the track frame. The combine according to claim 1, wherein a support frame of the movable wheel is rotatably supported.   The traveling crawler is provided with left and right traveling crawlers as the traveling portion, the traveling crawler is stretched on a track frame via a driving sprocket, and a plurality of teeth are formed at equal intervals on an outer peripheral surface of the driving sprocket. A structure for meshing some teeth of the drive sprocket, wherein a wear detecting groove is formed on the outer surface of the tooth at the tooth position and the outer surface of the tooth at the non-engaging position. Item 3. The combine according to item 1.

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