JP2015067207A - Work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work vehicle capable of easily removing mud, waste straws, etc. attached to crawlers, and of increasing a distance between a machine body and the crawlers.SOLUTION: A combine harvester 100 comprises a traveling part 1 and a machine body 2 provided above the traveling part 1. The traveling part 1 includes a pair of right and left crawlers 70 and 70. Each crawler 70 has: a truck frame 71; a plurality of rolling wheels 72 mounted on the truck frame 71; a driving wheel 73 provided behind the truck frame 71; a tension roller 74 provided in front of the truck frame 71; and a crawler belt 75 wound around the driving wheel 73 and the tension roller 74. The combine harvester 100 is configured so that a distance between the upper surface of each crawler 70 and the lower surface of the machine body increases toward the front.

Description

  The present invention relates to a work vehicle technology, and in particular, a work vehicle including a traveling unit and a machine body provided on an upper portion of the traveling unit, and the traveling unit includes a pair of left and right crawlers. About.

2. Description of the Related Art Conventionally, a work vehicle including a traveling unit and a machine body provided on an upper portion of the traveling unit, and the traveling unit includes a pair of left and right crawlers is known (for example, Patent Document 1). reference).
A crawler of a work vehicle according to the related art includes a track frame, a plurality of wheels mounted on the track frame, a drive wheel provided behind the traveling frame, and a tension roller provided in front of the track frame. And a crawler belt wound around the drive wheel and the tension roller.

JP 2013-31405 A

In the prior art, the distance between the crawler belt and the lower surface of the fuselage is configured to be constant. However, when the work vehicle moves forward, mud, waste, etc. are lifted together with the crawler track at the rear end of the crawler track, and it is necessary to remove adhesion of mud, waste, etc. at the rear end. It was.
Further, when the work vehicle is driven in a wetland, since the traveling unit sinks into the ground, it is necessary to dispose the aircraft body as high as possible with respect to the traveling unit.

  In view of the above problems, the present invention provides a work vehicle that can easily remove mud, waste, and the like attached to a crawler and can increase the distance between the airframe and the crawler.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, according to claim 1, a work vehicle including a traveling unit and an airframe provided at an upper portion of the traveling unit, the traveling unit includes a pair of left and right crawlers, and each crawler includes a track frame and A plurality of wheels mounted on the track frame, a drive wheel provided behind the track frame, a tension roller provided in front of the track frame, and the drive wheel and the tension roller. The distance between the upper surface of each crawler and the lower surface of the fuselage is configured to increase toward the front.

  In Claim 2, it forms so that the lower surface of the said body may become a plane.

  According to a third aspect of the present invention, a fuel tank is disposed on the upper surface of the airframe, and a step member is provided on the side surface of the airframe at substantially the same position as the fuel tank in the longitudinal direction of the airframe.

  As effects of the present invention, the following effects can be obtained.

  In claim 1, by narrowing the distance between the upper surface of the crawler belt and the lower surface of the machine body at the rear end portion of the crawler belt, it becomes easy to remove adhesion of mud and waste at the rear end portion of the crawler.

  In the present invention, the distance between the aircraft and the crawler can be increased as a whole, and the distance between the aircraft and the ground can also be increased as a whole.

  According to the third aspect of the present invention, even when the distance between the airframe and the ground is increased, it is easy to supply fuel to the fuel tank.

The side view which shows the structure of the combine which concerns on one Embodiment of this invention. The rear perspective view which similarly shows the structure of a combine. The side view which similarly shows the structure of a threshing part and a traveling part. The block diagram which similarly shows the structure of the drive system of a combine. The rear perspective view which similarly shows the structure of a traveling part and a body frame. The side view which similarly shows the structure of a traveling part. The side schematic diagram which similarly shows the structure of a traveling part. The perspective view which similarly shows the structure of a track frame. The side surface enlarged view which similarly shows the structure of the rear part of a driving | running | working part. The perspective view which similarly shows the structure of a drive case and a scraper. The rear view which similarly shows the structure of a drive case and a scraper. The top view which similarly shows the structure of a drive case and a scraper. (A) Front view similarly showing the configuration of the scraper (b) Same rear view (c) Same right side view (d) Same left side view (e) Same plan view (f) Same bottom view. The top view which similarly shows the structure of a body frame and a fuel tank. The bottom view which similarly shows the structure of a body frame.

  Next, embodiments of the invention will be described.

  First, the overall configuration of a combine 100 that is an example of a work vehicle according to the present embodiment will be described with reference to FIGS. 1 to 3. In the present embodiment, the combine 100 will be described. However, the work vehicle is not limited to the combine 100, and is a work vehicle including the traveling unit 1 and the body 2 provided on the upper part of the traveling unit 1. For example, it may be a construction vehicle or the like.

As shown in FIGS. 1 and 2, the combine 100 includes a traveling unit 1 and an airframe 2 provided on the upper part of the traveling unit 1. The traveling unit 1 includes a pair of left and right crawlers 70 and 70.
A cockpit 3 is disposed on the front of the airframe 2. An engine 9 is mounted on the upper right rear of the machine body 2, a grain tank 4 is disposed in front of the engine 9, and a discharge auger 5 for discharging the grains from the grain tank 4 is provided at the rear of the machine body.
The airframe 2 includes an upper frame 2a (see FIG. 5) formed in a rectangular frame shape in plan view, and a lower frame 2b (see FIG. 5) fixed on the lower surface of the upper frame 2a and having a longitudinal direction in the front-rear direction. have.

  Further, a cutting part 10 is arranged in front of the machine body 2, a threshing part 20 is arranged on the left side of the machine body 2, and a feeder house 30 communicates the rear end of the cutting part 10 and the front entrance of the threshing part 20. Yes. A side cover 7 is provided on the outer side surface of the threshing unit 20.

A platform 12 is provided in the front part of the feeder house 30, and a lateral feed auger 13 is arranged in the left-right direction at a right angle to the traveling direction on the platform 12, and a cutting blade 14 is laterally installed in the lower front part of the lateral feed auger 13. Yes.
Weeding plates 15 and 15 are provided at the left and right front ends of the platform 12, and a rear portion of a support arm 17 that supports a reel 16 is pivoted at the left and right ends of the rear portion of the platform 12. Is provided with a power transmission mechanism 18 comprising a reel rotation driving belt, pulley, and the like. The reel 16 is moved up and down by a hydraulic cylinder (not shown) as an actuator interposed between the support arm 17 and the platform 12.

  In the feeder house 30, a feeder conveyor 31 is provided as a transport unit so that the harvested cereals are transported to the threshing unit 20.

As shown in FIGS. 1 and 3, the threshing unit 20 is formed of a handling chamber 21 and a sorting unit 40.
As shown in FIG. 1, a handling cylinder 24 is arranged in the handling chamber 21. By rotation of the handling cylinder 24, the cereal straw is spirally conveyed to the rear of the handling chamber 21 and threshed. The handling cylinder 24 has a support shaft 24a (see FIG. 4) disposed in parallel with the longitudinal direction of the machine body, and rotates about the support shaft 24a as a fulcrum.

  Further, a chopper (not shown) in which a plurality of cutting blades are planted on the rotating shaft is arranged below the rear part of the handling cylinder 24, and the waste transferred to the rear part of the handling chamber 21 by the handling cylinder 24 is finely arranged. After cutting, it is discharged outside the aircraft.

  As shown in FIG. 3, the sorting unit 40 includes a swinging main body 42 having a receiving net (or concave) 22 disposed below the handling cylinder 24, and having a chaff sheave 41, a cereal plate, and the like. , The first conveyor 46, the second conveyor 47, the second conveyor 47, etc. are arranged in order from the front side, and the grains, swarf, etc. leaking from the receiving net 22 are selected. The second item out of the leaked grain, sawdust, etc. is returned to the front part of the handling chamber 21 through the second conveyor 47 and the second reduction device 43.

Next, the drive structure of the combine 100 is demonstrated using FIG.
As shown in FIG. 4, a travel speed change pump case 26 having a pair of swash plate variable left and right travel hydraulic pumps 25 is provided. The left / right traveling hydraulic pump 25 is connected to the engine 9 via a pulley or the like, and the power from the engine 9 is transmitted to the left / right traveling hydraulic pump 25. The left and right traveling hydraulic pump 25 is connected to traveling hydraulic motors 32 and 32 corresponding to the left and right crawlers 70 and 70, respectively. The traveling hydraulic motors 32 and 32 are connected to the drive wheels 73 via the power transmission mechanism 102. The power transmission mechanism 102 is stored in the drive case 105. With this configuration, the traveling hydraulic motors 32 and 32 are individually driven by the left and right traveling hydraulic pump 25, and the power of the left and right traveling hydraulic motors 32 and 32 is transmitted to the drive wheels 73 via the power transmission mechanism 102. Then, the left and right crawlers 70 and 70 are moved forward and backward by rotating forward and backward.

The power from the engine 9 is transmitted to the handling cylinder 24 through the first counter shaft 33 and the second counter shaft 34, and further, through the support shaft 24 a of the handling cylinder 24, 46, the second conveyor 47, the second reduction device 43, and the swinging main body 42, respectively.
The power from the engine 9 is transmitted to the feeder conveyor 31 through the support shaft 24a of the handling cylinder 24, and further, through the power transmission mechanism 18, the lateral feed auger 13, the cutting blade 14, and the cutting blade 10 Each is transmitted to the reel 16.

With the above configuration, the cutting operation is performed by weeding with the weed board 15, scraping the cereal with the rotation of the reel 16, cutting the stock side of the cereal with the cutting blade 14, and laterally feeding the harvested culm. The auger 13 is rotated to the center side, and is fed backward from the front end of the feeder house 30 by the feeder conveyor 31 to be supplied to the threshing unit 20.
The cereal is threshed by the handling cylinder 24 in the threshing unit 20, and the grain leaked from the receiving net 22 is sorted by the sorting unit 40, and the first of them is stored in the Glen tank 4. Moreover, after passing through the 2nd reduction | restoration apparatus 43, a 2nd thing is thrown into the front-end part of the threshing part 20, and is subjected to re-sorting. Further, the remaining threshing after threshing is finely cut by a chopper and then discharged outside the machine body.

Next, the crawlers 70 and 70 of the traveling unit 1 will be described with reference to FIGS. 3 and 5 to 12.
As shown in FIGS. 5 and 6, each crawler 70 includes a track frame 71 arranged below the body 2, one on each of the left and right sides, a plurality of wheels 72 attached to the track frame 71, a track A drive wheel 73 provided behind the frame 71, a tension roller 74 provided in front of the track frame 71, a crawler belt 75 wound around the drive wheel 73 and the tension roller 74, and the tension roller 74 in the front-rear direction And a tension adjusting device 76 that is slid on.

  One track frame 71 is provided on each of the left and right sides. Hereinafter, the left and right track frames 71 will be described as 71L and 71R, respectively. The track frames 71L and 71R are provided on the lower surface of the airframe 2, and as shown in FIG. 8, the track frame 71L and the track frame 71R have a symmetrical structure. A connecting frame 77 for connecting the track frame 71L and the track frame 71R is provided between the track frame 71L and the track frame 71R.

  Two connecting frames 77 are provided in the longitudinal direction of the fuselage, and an upper member 77a having a longitudinal direction in the left-right direction, and a lower member projecting from the left and right ends of the upper member 77a toward the outside of the fuselage and downward. 77b and 77b, and the tip of the lower member 77b is connected to the track frames 71L and 71R, respectively. As a result, the track frames 71L and 71R are connected to each other. A reinforcing member 78 is fixed to the lower surface of the lower member 77 b of the connecting frame 77. The reinforcing member 78 includes a triangular portion in side view and a portion protruding from the triangular portion in a direction parallel to the inclined surface of the lower member 77b, and the upper surface of the triangular portion is the lower frame 2b. It is fixed to the lower surface. Thereby, the connection frame 77 is fixed to the lower frame 2b.

  A plurality of roller wheels 72 are arranged on the lower side of the track frames 71L and 71R. The wheel 72 is fixed to the track frames 71L and 71R so as to be rotatable. When the wheel 72 comes into contact with the crawler belt 75 from the inner surface on the ground side of the crawler belt 75, the crawler belt 75 is held in a grounded state.

  As shown in FIG. 3, the drive wheels 73 provided behind the track frames 71L and 71R are sprockets that drive the crawler belts 75. The drive wheels 73 support the rear side of the crawler belt 75 and move the crawler belt 75 with the power transmitted from the power transmission mechanism 102.

  Further, as shown in FIG. 7, the height h1 of the center of the rotation shaft 74a of the tension roller 74 from the ground is lower than the height h2 of the center of the rotation shaft 73a of the drive wheel 73 from the ground. It is configured. With this configuration, the distance between the upper surface of each crawler 70, 70 and the lower surface of the fuselage is configured to increase toward the front. That is, as shown in FIG. 7, the distance d1 between the upper surface of the front end of the crawler 70 and the lower surface of the body 2 is formed to be larger than the distance d2 between the upper surface of the rear end of the crawler 70 and the lower surface of the body.

  A tension roller 74 provided in front of the track frames 71L and 71R is a member that maintains the tension of the crawler belt 75. The tension roller 74 is fixed to the front end portion of the tension adjusting device 76 so as to be slidable in the front-rear direction.

  As shown in FIGS. 5 and 6, the tension adjusting device 76 is provided above the track frames 71 </ b> L and 71 </ b> R and is a support member 91 that supports the tension roller 74 and a sliding member connected to the rear end of the support member 91. 92, a biasing member 93 that biases the sliding member 92 forward, and a case 94 that houses the sliding member 92 and the biasing member 93, and the upper crawler belt 75 on the outer surface of the case 94. Is provided with a guide roller 95.

  As shown in FIGS. 3 and 6, the support member 91 is configured in a planar view type, and has a base portion 91 a whose longitudinal direction on the rear side is the left-right direction, and two protruding from the both ends of the base portion 91 a to the front side. It is comprised from the one support part 91b * 91b. A tension roller 74 is disposed in the middle in the left-right direction between the two support portions 91b and 91b. The rotation shaft 74a of the tension roller 74 protrudes from the center of the tension roller 74 in the left-right direction, and the tension roller 74 can be rotated by pivotally supporting the rotation shaft 74a with the support portions 91b and 91b on both sides. To support.

  The sliding member 92 is a quadrangular columnar member and is arranged so that the longitudinal direction is the front-rear direction. A rear surface of a base portion 91 a provided at the rear end of the support member 91 is fixed to the front end of the sliding member 92. With this configuration, the support member 91 and the tension roller 74 slide in the front-rear direction in accordance with the sliding of the sliding member 92 in the front-rear direction.

  The biasing member 93 is disposed behind the sliding member 92 and biases the sliding member 92 forward. The urging member 93 is composed of a spring and can change the urging force by contracting in the front-rear direction. The rear portions of the urging member 93 and the sliding member 92 are stored in the case 94. The case 94 has a rectangular inner space with an open front, and the urging member 93 is always stored in the case 94. When the sliding member 92 slides backward, the rear part of the sliding member 92 is stored in the internal space of the case 94.

  The tension adjusting device 76 is arranged with its longitudinal direction as the front-rear direction, and its rear end is arranged near the center of the crawlers 70, 70 in the front-rear direction. More specifically, the rear end of the case 94 is disposed in the vicinity of the center in the front-rear direction of the crawlers 70 and 70 and behind the center in the front-rear direction.

  Further, a guide roller 95 for supporting a crawler belt 75 on the outer surface of the case 94 and on the upper side of the crawlers 70 is provided. As shown in FIG. 5, the guide roller 95 is provided at the center in the front-rear direction of the crawlers 70 and 70 and is rotatably supported by a stay member 95 a that is a support portion fixed to the case 94. . A non-grounding side (upper side) crawler belt 75 is held by the guide roller 95.

Next, the rear end surfaces 71a of the track frames 71L and 71R will be described with reference to FIGS. Here, the rear end surface 71a of the track frame 71R will be described.
The rear end surface 71a of the track frame 71R is cut out along the outer peripheral edge of the drive wheel 73, as shown in FIGS. More specifically, as shown in FIGS. 8 and 9, the rear end surface 71a of the track frame 71R is a first surface 79a that extends vertically upward from the intersection with the lower side in a side view, and a second surface that inclines backward as it goes downward. It is comprised from the surface 79b and the 3rd surface 79c extended perpendicularly upward from the upper end of the 2nd surface 79b.

  The inclination of the second surface 79b in the front-rear direction is formed along the outer peripheral edge of the drive wheel 73 as shown in FIG. With this configuration, the rear end surface 71 a of the track frame 71 is prevented from coming into contact with the drive wheels 73, and there is no gap between the track frame 71 and the drive wheels 73.

  A guide plate 81 is attached to the rear end surface 71 a of the track frame 71. The guide plate 81 has a first surface 82a attached to the first surface 79a, a second surface 82b attached to the second surface 79b, and a third surface 82c attached to the third surface 79c. And the inclination of the front-back direction of the 2nd surface 82b is formed along the outer periphery of the driving wheel 73 similarly to the 2nd surface 79b.

  The third surface 82c of the guide plate 81 is provided to extend further upward from the upper end of the third surface 79c. With this configuration, the front of the drive wheel 73 can be protected by the third surface 82 c of the guide plate 81. For example, even if the drive wheel 73 rotates while adhering mud and waste from the top to the front, the guide plate 81 can remove mud and waste and the like.

  A drop prevention guide 82 for preventing the crawler belt 75 from falling off is provided below the track frames 71L and 71R. In this embodiment, two dropout prevention guides 82 are provided at the front end and the rear end of the track frames 71L and 71R. The dropout prevention guides 82 are arranged on the left and right of the crawler belt 75, and prevent the crawler belt 75 from falling off by preventing the crawler belt 75 from shifting in the left-right direction.

  The rear end (P2 in FIG. 9) of the drop-off prevention guide 82 arranged on the rear side is a third surface 79c (P1 in FIG. 9) that is a portion that protrudes to the foremost side of the rear end surface 71a of the track frame 71 in a side view. ) Is arranged behind. Specifically, as shown in FIG. 9, the rear end of the drop-off prevention guide 82 projects to the rearmost side and the third surface 79c, which is the portion that projects to the frontmost side of the rear end surface 71a of the track frame 71. It arrange | positions so that it may be located between the 1st surface 79a (P3 in FIG. 9) which is a part. By comprising in this way, the drop-off prevention guide 82 arrange | positioned at the rear part of the body 2 can be arrange | positioned back as much as possible.

Further, a scraper 101 that removes mud adhering to the crawler belt 75 and the drive wheel 73 is provided on the drive wheel 73 of each crawler 70. The scraper 101 is provided on the side of each drive wheel 73. Here, the scraper 101 provided on the right drive wheel 73 will be described.
As shown in FIGS. 13A to 13F, the scraper 101 includes an attachment portion 101a attached to the lower frame 2b and a plate surface 101b protruding from the lower portion of the attachment portion 101a to the outside of the machine body.
The attachment portion 101a is formed in a plate shape, and a screw hole 101c for inserting a screw 111 as a fixing member is provided in an upper portion thereof. The rear lower end of the mounting portion 101a is bent toward the inner side of the machine body (left side). Moreover, the screw hole 101c is provided in the rear upper part of the attachment part 101a, and the board surface 101b is provided in the front lower direction of the attachment part 101a.

The plate surface 101 b is formed along the inner peripheral surface of the crawler belt 75. As shown in FIG. 13A, the plate surface 101b is provided with two screw holes 101d for inserting a screw 112 as a fixing member on the inner side (left side) of the machine body.
The plate surface 101b is formed such that its rear end surface extends backward from the rear end on the drive wheel 73 side toward the rear end on the drive case 105 side. That is, as shown in FIG. 10, the rear end surface of the plate surface 101 b is formed so as to incline rearward toward the inner side (left side) in the rear perspective view. By configuring in this way, mud and waste excavated in contact with the rear end surface in the crawler belt 75 move toward the inside of the body and easily fall to the ground. Can be prevented.

Next, the attachment of the scraper 101 to the drive case 105 will be described with reference to FIGS.
The scraper 101 is fixed to a drive case 105 in which a power transmission mechanism 102 that transmits power to the machine body 2 and the drive wheels 73 is stored, and is disposed at a rear portion of the drive case 105. More specifically, the screw hole 101c of the attachment portion 101a and a hole (not shown) provided in the lower frame 2a are fixed by the screw 111. Further, a screw hole 101d in the plate surface 101b and a hole (not shown) provided in the drive case 105 are fixed by a screw 112.

  As shown in FIGS. 2 and 14, a fuel tank 110 is disposed on the upper surface of the body 2. The fuel tank 110 is disposed below the cockpit 3 and stores fuel to be supplied to the engine 9.

  As shown in FIGS. 2, 14, and 15, a step member 115 is provided on the side surface of the fuselage 2 at a position substantially the same as the fuel tank 110 and the longitudinal direction of the fuselage 2. The step member 115 is attached to the outer surface of the upper frame 2a of the machine body 2, and has a stay member 115a and a step plate 115b. The step plate 115b is supported at both ends by the lower end of the stay member 115a. The height of the step plate 115b is arranged to be lower than the height of the upper frame 2a and higher than the height of the upper surface of the crawler 70. With this configuration, when supplying fuel to the fuel tank 110 disposed on the upper surface of the upper frame 2a, an operator can easily supply the fuel tank 110 by placing a foot on the step member 115. can do.

  Further, as shown in FIGS. 5, 14, and 15, the lower surface of the airframe 2 is formed to be a flat surface. That is, as shown in FIG. 4, the Kara 45, the first conveyor 46, and the second conveyor 47 are arranged above the upper frame 2 a of the machine body 2. Thereby, since the lowermost surface of the airframe 2 becomes the upper frame 2a, the distance between the airframe 2 and the ground can be increased.

As described above, the combine 100 includes the traveling unit 1 and the airframe 2 provided on the upper part of the traveling unit 1, and the traveling unit 1 includes a pair of left and right crawlers 70 and 70. A track frame 71, a plurality of wheels 72 attached to the track frame 71, a drive wheel 73 provided behind the track frame 71, a tension roller 74 provided in front of the track frame 71, and a drive wheel 73 The crawler belt 75 is wound around the tension roller 74, and the distance between the upper surface of each crawler 70 and the lower surface of the machine body is configured to increase toward the front.
With this configuration, the distance between the upper surface of the crawler belt 75 and the lower surface of the airframe 2 at the rear end portion of the crawler belt 75 is reduced, so that adhesion of mud, waste, etc. can be easily removed at the rear end portion of the crawler 70. Become.

Moreover, it forms so that the lower surface of the body 2 may become a plane.
By comprising in this way, the distance between the body 2 and the crawler 70 can be enlarged as a whole, and the distance between the body 2 and the ground can also be enlarged as a whole.

A fuel tank 110 is disposed on the upper surface of the machine body 2, and a step member 115 is provided on the side surface of the machine body 2 at substantially the same position in the front-rear direction of the fuel tank 110.
With this configuration, even when the distance between the airframe 2 and the ground is increased, the fuel tank 110 can be easily refueled.

100 Combine (work vehicle)
DESCRIPTION OF SYMBOLS 1 Traveling part 2 Airframe 2a Upper frame 2b Lower frame 3 Pilot seat 4 Glen tank 5 Discharge auger 7 Side cover 10 Mowing part 20 Threshing part 70 Crawler 71 Track frame 72 Rolling wheel 73 Driving wheel 74 Tension roller 75 Crawler belt 76 Tension adjustment device 91 Support member 92 Sliding member 93 Biasing member 94 Case 95 Guide roller 110 Fuel tank 115 Step member

Claims (3)

A work vehicle comprising: a traveling unit; and an airframe provided at an upper portion of the traveling unit,
The traveling unit includes a pair of left and right crawlers,
Each of the crawlers includes a track frame, a plurality of wheels attached to the track frame, a drive wheel provided at the rear of the track frame, a tension roller provided at the front of the track frame, and the drive wheel. A crawler belt wound around the tension roller,
A work vehicle configured such that a distance between an upper surface of each of the crawlers and a lower surface of the fuselage increases toward the front.   The work vehicle according to claim 1, wherein a lower surface of the airframe is formed to be a flat surface.   The work vehicle according to claim 2, wherein a fuel tank is disposed on the upper surface of the machine body, and a step member is provided on a side surface of the machine body at substantially the same position as the fuel tank in the longitudinal direction of the machine body.

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