JP5006854B2 - Working machine - Google Patents

Description

  The present invention relates to a work machine in which left and right track frames in a pair of left and right crawler travel devices are supported by a machine frame so as to be movable up and down via a swing link that is driven to swing around a horizontal axis in the horizontal direction of the machine body. .

The work machine is configured to correct the machine posture to a desired machine posture by moving the track frame up and down relative to the machine frame by swinging the front and rear swing links (for example, , See Patent Document 1). In this conventional crawler traveling device, an accommodation mechanism (auxiliary link 48 of Patent Document 1) is provided between the free end portion of the swing link and the track frame, and is formed by the body frame, the track frame, and the swing link. Compensated for the movement of the link mechanism.
JP 2004-276671 A

When the above-mentioned auxiliary link (also referred to as a cancel link) is adopted as the accommodation mechanism, a large external force in the lateral direction of the crawler acts from the ground when the aircraft turns sharply or pivots in place (turning on the spot). A large bending force may act on the cancel link due to an external force.
For example, in FIGS. 3 and 4 of Patent Document 1, when a lateral external force is applied to the crawler traveling device due to a sudden turn, the lateral external force is applied to the track frame (16 of Patent Document 1) and an auxiliary link (Patent Document). 1), the bending force acts on the auxiliary link (48 of Patent Document 1). In particular, a large bending force acts on a connecting portion between the swing link (12L of Patent Document 1) and the auxiliary link (48 of Patent Document 1).

  An object of the present invention is to provide a working machine with excellent durability that resists external force in the lateral direction by adopting an accommodation mechanism in place of a conventional auxiliary link.

[Configuration of the first invention]
According to a first aspect of the present invention, the body frame is movable up and down via a swing link that swings the left and right track frames of the pair of left and right crawler travel devices around a first horizontal axis in the left-right direction of the body. The outer peripheral portion of the rotating body is rotatably supported around the second horizontal axis in the left-right direction of the machine body on one of the free end side of the swing link and the track frame. A pivot shaft is provided on the free end side of the swing link and the other of the track frame, and the pivot shaft is displaced from the rotating body, and the axis of the pivot shaft is biased from the second horizontal axis. It is supported at a different position.

[Action]
According to the first aspect of the present invention, the airframe is moved up and down by swinging and driving the rocking link between the airframe frame and the track frame about the first horizontal axis to raise and lower the left and right track frames with respect to the airframe frame. It can be done.
According to the first aspect of the invention, the outer peripheral portion of the rotating body is supported on the free end side of the swing link so as to be rotatable around the second horizontal axis in the lateral direction of the machine body, and the pivot shaft is provided on the track frame. The shaft is supported on the rotating body at a position deviated from the second horizontal axis, or the outer periphery of the rotating body is supported on the track frame so as to be rotatable around the second horizontal axis in the lateral direction of the machine body. A pivot shaft is provided on the free end side of the swing link, and the pivot shaft is supported on the rotating body at a position offset from the second horizontal axis. As a result, a rotating body whose outer peripheral portion is supported by the accommodation mechanism between the track frame and the swing link, and a pivotal support which is supported by the rotating body and which causes the second horizontal axis and the axis of the rotating body to be biased. This movement is absorbed by the rotation of the rotating body around the second horizontal axis when the pivot shaft moves around the second horizontal axis along with the swing of the swing link. The function of the accommodation mechanism is provided by the pivot shaft and the rotating body.

According to the first invention, for example, as shown in FIGS. 2 and 4, when a lateral external force is applied to the crawler traveling device due to a sudden turn, the lateral external force is applied to the track frame 17, and the rotating body (large diameter It is thought that it hangs on the outer periphery of the shaft 42). Thus, when a lateral external force is applied to the outer peripheral portion of the rotating body (large-diameter shaft) 42, the lateral external force is below and above the pivot shaft (rear link free end shaft) 40, front side, rear side, etc. It is thought that it spreads like
For example, when a lateral external force is applied to the lower side and the upper side of the pivot shaft (rear link free end shaft) 40, the bending force due to the lateral external force applied to the lower side of the pivot shaft (rear link free end shaft) 40. And the bending force due to the lateral external force applied to the upper side of the pivotal support shaft (rear link free end shaft) 40 are considered to be in opposite directions and cancel each other, and the rotating body (large diameter shaft) 42 and The bending force applied to the pivot shaft (rear link free end shaft) 40 or the like can be suppressed.

[Effect of the first invention]
Therefore, according to the 1st invention, there exists an advantage which can be made into the thing excellent in durability with respect to the external force of the horizontal direction received when turning a body rapidly.

[Configuration of the second invention]
According to a second aspect of the present invention, in the working machine according to the first aspect, a boss portion is formed on one of the swing link and the track frame, and an outer peripheral portion of the rotating body is supported on the boss portion.

[Action]
According to the second aspect of the present invention, the outer peripheral portion of the rotating body is rotatably supported around the second horizontal axis in the left-right direction of the machine body on the boss formed on the free end side of the swing link, and the pivot shaft is attached to the track frame. And the pivot shaft is supported by the rotating body at a position offset from the second horizontal axis, or the outer peripheral portion of the rotating body is mounted on the boss formed on the track frame in the left-right direction of the body. A pivot shaft is rotatably supported around the horizontal axis, a pivot shaft is provided on the free end side of the swing link, and the pivot shaft is supported on the rotating body at a position offset from the second horizontal axis. .

As a result, when the outer peripheral portion of the rotating body is supported by the boss portion and a lateral external force is applied to the crawler traveling device due to a sudden turn, the lateral external force is applied to the entire outer peripheral portion of the rotating body. Since it is considered that the bending force is applied in a distributed manner, it is possible to further promote the state in which the bending forces due to the external force in the lateral direction cancel each other, and further suppress the bending force applied to the rotating body, the pivot shaft, and the like.

[Effect of the second invention]
Therefore, according to the 2nd invention, there exists an advantage which can be made excellent in the durability strong against the external force of the horizontal direction received when the airframe turns rapidly.

[Configuration of the third invention]
A third invention according to claim 3 is the work machine according to the second invention, wherein a first grease oil passage is formed between the boss portion and the rotating body, and between the rotating body and the pivot shaft. A second grease oil passage is formed in the first grease oil passage, and the first grease oil passage and the second grease oil passage are communicated by an oil passage.

[Action]
According to the third aspect of the invention, the first grease oil passage between the boss portion and the rotating body and the second grease oil passage between the rotating body and the pivot shaft are communicated by the oil passage. A single grease nipple for supplying grease to the oil passage can be provided, and the provision of a grease nipple in the second grease oil passage formed between the rotating body and the pivot shaft, which is difficult to supply, is omitted. It is possible to supply grease to both grease oil paths by providing a single grease nipple in a place where the outer periphery of the boss is easy to see and lubricate, without the need to make holes in the track frame body. I can do it now.

[Effect of the third invention]
According to the third aspect of the present invention, since only one place can be easily refueled, the refueling work can be reduced and the refueling work can be performed easily and reliably.

[Configuration of the fourth invention]
According to a fourth aspect of the present invention, in the work machine according to the first to third aspects, the rotating body is disposed on an upper portion of a track frame.

[Action]
According to the fourth aspect of the invention, since the rotating body is disposed at the upper part of the track frame, the assembling place is at a higher position, and the rotating body and the pivotal support part are provided than when the rotating body is provided at the lower part of the track frame. Since it is difficult to apply mud, the environment is good and maintenance such as disassembly is easy.
In addition, since the rotating body is arranged on the upper part of the track frame, the crawler endless belt is rotated even if the crawler endless belt rolls upward due to a lateral force with respect to the crawler during a sudden turn or the like. It is also possible to avoid damage due to contact with the surface.

[Effect of the fourth invention]
According to the fourth invention, the usage environment for the rotating body is good, the durability is improved, and the maintenance work is facilitated.

  As shown in FIG. 1, a self-propelled vehicle 4 that is self-propelled by a pair of left and right crawler traveling devices 1, 1 and that is equipped with a driver's seat 2 and that has a prime mover below the driver's seat 2. The base end side of the pre-processing section frame 7 of the pre-cutting processing section 6 is connected to the front section of the machine frame 5 so as to be rotatable around a horizontal axis of the body, and the threshing device 8 and the grain are connected to the body frame 5. A grain tank 9 is mounted to constitute a combine.

  This combine harvests grains such as rice and wheat. When the hydraulic lift cylinder 10 connected to the pretreatment unit frame 7 is operated, the lift cylinder 10 moves the pretreatment unit frame 7 up and down. Is moved up and down to the working position where the pre-cutting processing unit 6 is lowered to near the ground and the ascending non-working position which is raised above the ground. When the pre-cutting processing unit 6 is moved to the descending work position and the self-propelled machine body 4 is caused to travel, the pre-cutting processing unit 6 causes the plurality of pulling devices 11 to line up the planted stems of the plurality of planting ridges to be cut in the lateral direction of the machine body. The rear side of the fuselage is formed by a conveying device 13 including a nipping conveying device that acts on the stock base side and a latching conveying device that acts on the head side, and a mowing cereal that is raised and processed separately by the clipper type mowing device 12. To the side. While conveying the harvested cereal from the conveying device 13 toward the rear side of the machine body by the threshing feed chain 14, the tip side is supplied to the handling room and threshing is performed, and the threshing grains from the threshing device 8 are collected in the grain tank 9. Store.

The crawler traveling device 1 on the left side and the crawler traveling device 1 on the right side are configured in the same manner, and the description of the right crawler traveling device 1 based on the drawings is omitted, and the crawler traveling device 1 on the left side is based on the drawings. I will explain.
As shown in FIGS. 2 and 3, the crawler travel device 1 on the left side has a track frame 17 facing the front and rear of the vehicle body connected to the left lateral side of the vehicle body frame 5 via a pair of front and rear swing links 15 and 16. A plurality of grounding wheels 18 that are supported by the track frame 17 along the longitudinal direction of the track frame 17 so as to be freely rotatable, and are supported at the rear end of the track frame 17 via a tension rod 19 so as to be freely rotatable. An idle ring is provided via a tension ring body 20 that is allowed to move, a crawler driving wheel body 22 that is rotatably supported by a transmission case 21 fixed to the front end side of the body frame 5, and a bracket 38 that is provided on the left body frame 5. A crawler belt as an endless belt made of rubber that is wound around the upper rolling wheel 24 that is supported so as to freely roll, and all the above-described ring bodies 18, 20, 22, 24. It is then configured with a preparative 25. That is, the crawler driving wheel 22 is driven by a traveling mission (not shown) located inside the mission case 21, the crawler belt 25 is put in tension by the tension wheel 20, and each grounding wheel 18 is used. While guiding the lower side of the crawler belt 25 to be grounded, the crawler driving wheel body 22 drives the crawler belt 25 in a state of rotating along the respective wheel bodies 18, 20, 22, and 24. .

  Two grounding rollers 18 are connected to the track frame 17 through a balance link 26 as a set, and the balance link 26 is provided with a hook-shaped guide 28 for preventing the wheel from being removed. Each grounding wheel 18 swings up and down with respect to the track frame 17 around an axis center where the intermediate portion of the balance link 26 is rotatably connected to the track frame 17, and the free end portion of the balance link 26. Rolls around the axis of the wheel located at. As shown in FIG. 3, the axle case portion 27 that extends from the case body of the mission case 21 to the laterally outward direction of the vehicle body and rotatably supports the crawler driving wheel 22 is attached to the left vehicle body frame 5. It is supported via a bracket 30.

  As shown in FIGS. 2 and 3, a front link proximal shaft 29 facing the vehicle body is provided on a base portion 15 a of the front swing link 15 located on the front side of the body of the pair of front and rear swing links 15 and 16. Are connected to the body frame 5 via a bracket 30 to form a cylindrical shaft-shaped front link support portion 31 provided on the body frame 5. By attaching the front link base end shaft 29, the base portion 15a of the front swing link 15 is connected to the front link support portion 31 of the body frame 5 with the axis of the front link base end shaft 29 (first horizontal axis P1). It is supported so that it can rotate freely. As shown in FIGS. 2 and 3, the free end side (front link free end shaft 32) of the front swing link 15 is connected to a front link connecting portion 33 provided with a connecting block fixed to the front end side of the track frame 17. It is pivotably connected.

  As shown in FIGS. 2, 3, and 4, in the rear swing link 16 located on the rear side of the body among the pair of front and rear swing links 15, 16, the base body 16 a of the rear swing link 16 is mounted on the body. The rear link proximal end shaft 37 is connected to the side frame, and the rear link proximal end shaft 37 is attached to the rear link support portion 39 attached to the body frame 5 via the bracket 38, whereby the rear swing link 16 is connected to the rear link. The base end shaft 37 is supported so as to be rotatable about the axis (first horizontal axis P2). As shown in FIGS. 2, 4, and 5, the free end side (rear link free end shaft 40) of the rear swing link 16 is provided with a connecting block fixed at a position above the track frame 17. A large-diameter shaft 42 (an example of a rotating body) rotatably supported around the second horizontal axis P3 via the boss portion 46 at the link connecting portion 41 is located at a position deviated from the second horizontal axis P3. The shaft P4 is rotatably connected around the axis P4.

  That is, a rotating body comprising a large-diameter shaft 42 is supported on the rear end side of the track frame 17 so as to be rotatable about the second horizontal axis P3 in the left-right direction of the machine body, and is pivotally supported on the free end side of the rear swing link 16. The rear link free end shaft 40 is provided as a shaft, and the rear link free end shaft 40 is supported by the large-diameter shaft 42 at a position (horizontal shaft core P4) offset from the second horizontal shaft core P3.

  As shown in FIGS. 2 and 3, the rear link base end shaft 37 is splined to the base portion 16 a of the rear swing link 16 so as to be rotatable relative to the rear link support portion 39 of the body frame 5. By being inserted, it is configured to rotate with respect to the body frame 5 integrally with the rear swing link 16.

The rear link base end shaft 37 is connected to the end protruding from the rear link support portion 39 to the inside of the body frame so that the base end side is integrally rotatable. The rear swing link 16 is connected via the rear link base end shaft 37. The end of the piston rod as one end side of the double-acting hydraulic lifting cylinder 44 is connected to the rear link operation arm 43, and the cylinder tube as the other end side of the lifting cylinder 44 is connected. Ends are connected to the body frame 5.
A front link operation arm 34 is connected to an end portion of the front link base end shaft 29 supported by the front link support portion 31 and protrudes to the inside of the body frame, and the front link operation arm 34 and the rear link operation are connected. The arm 43 is interlocked and connected via a connecting rod 45.

  As a result, when the elevating cylinder 44 is driven, the rear link operation arm 43 is swung, and the front link operation arm 34 is also swung through the connecting rod 45. The moving link 16 is operated so as to swing up and down with respect to the body frame 5 around the axis P1, P2 of the front link base end shaft 29 and the rear link base end shaft 37, and the front swing link 15 and the rear swing The link 16 moves the track frame 17 up and down with respect to the body frame 5. As shown in FIG. 2, when the elevating cylinder 44 is operated to the shortest side, the track frame 17 comes closest to the body frame 5 and becomes almost parallel.

Next, the structure of the attachment portion of the rear swing link 16 with respect to the track frame will be described.
Conventionally, in order to make the movement of the link smooth between the rear swing link 16 and the track frame 17, links called interchange links, play links, cancel links, etc. have been provided. The double eccentric shaft structure shown in FIGS. 4 to 6 is adopted.
A boss portion 46 is fixed to a rear link connecting portion constituted by brackets 41 attached to the left and right of the track frame 17, and the large-diameter shaft 42 is supported on the boss portion 46 via a pair of left and right first bushes 47, A pivot shaft, which is the rear link free end shaft 40, having a third shaft core P 4 at a position displaced from the second shaft core P 3 of the large diameter shaft 42 is supported. The pivot shaft 40 is provided within the range of the large-diameter shaft 42, and a pair of second bushes 48 are interposed between the large-diameter shaft 42 and the pivot shaft 40. First and second grease oil passages 49 and 50 are formed between the left and right second bushes 48, and the first grease oil passage 49 and the second grease oil passage 50 communicate with each other through an oil passage 51. A grease nipple 52 that communicates with the first grease oil passage 49 is attached to the boss portion 46.
First and second seal rings 53 and 54 are fitted between the large diameter shaft 42 and the boss portion 46 at the left and right ends of the large diameter shaft 42 and between the large diameter shaft 42 and the pivot shaft 40. is there.
Grease is injected from the grease nipple 52 with a grease gun so that the movement of the pivot is smooth and wear is prevented.

As shown in FIGS. 4, 5, and 6, retaining plates 55 are fixed to both ends of the large-diameter shaft 42 with bolts 56 so that the large-diameter shaft 42 does not come out of the boss portion 46.
A bifurcated support member 57 is formed at the free end of the rear swing link 16, and a retaining member 58 of the pivot shaft 40 supported by the bifurcated support member 57 is fixed to the bifurcated support member 57 with a bolt 59. is there.

  When the track frame 17 is lifted with respect to the body frame 5 and the self-propelled body 4 is lowered by the structure of the mounting portion of the rear swing link 16 as shown in FIG. The large-diameter shaft 42 rotates so that the horizontal axis P4 of the pivot shaft 40 is positioned in front of the axis P3 of the large-diameter shaft 42, and the pivot shaft 40 is at an intermediate height in FIG. When the horizontal axis P4 passes over the axis P3 of the large-diameter shaft 42 and the track frame 17 is lowered with respect to the body frame 5 to raise the self-propelled body 4, the pivot of the rear swing link 16 is increased. The pivot shaft 40 and the large-diameter shaft 42 rotate so that the horizontal shaft core P4 of the support shaft 40 is positioned in front of the horizontal shaft core P3 of the large-diameter shaft 42. As a result, the movement of the link becomes smooth, and the crawler traveling device can be made durable even if the crawler travels suddenly and the crawler traveling device receives a large lateral force from the ground.

[Another embodiment]
In the above embodiment, the large-diameter shaft 42 is fixed to the boss portion 46 fixed to the track frame 17, and the pivot shaft 40 provided at the free end portion of the rear swing link 16 is supported by this. However, as shown in FIG. 8, the free end portion of the swing link 16 supports the outer peripheral portion of the large-diameter shaft 42 as a rotating body so as to be rotatable about the horizontal axis P3 in the left-right direction of the machine body, and the track frame. The pivot shaft 40 may be provided on the shaft 17, and the pivot shaft 40 may be supported by the large diameter shaft 42 at a position displaced from the horizontal axis P3 of the large diameter shaft 42.

  In the above embodiment, the double eccentric shaft structure of the rotating body 42 and the pivot shaft 40 is formed between the free end portion of the rear swing link 16 and the track frame 17. The structure may be provided only between the free end portion of the front link 15 and the track frame 17 or both between the free end portions of the front and rear swing links 15 and 16 and the track frame 17.

  The rotating body may be constituted by a shaft as in the above embodiment, or may be constituted by a cylindrical member or a pair of left and right disc members whose left and right end surfaces are closed.

  As a means for supporting the rotating body, in addition to the boss portion that covers and supports the entire outer periphery of the rotating body as in the above embodiment, the outer periphery of the rotating body with the rotation center (axial core P3) interposed therebetween. You may comprise with a pair of upper and lower holding members which hold | maintain a part partially.

  In addition to the combine, onions, carrots and the like can also be applied to work vehicles for harvesting various crops. These combine, work vehicle, and the like are collectively referred to as work machines.

Side view of the entire combine Side view of the left crawler travel device Top view of the left crawler travel device Side view showing structure of mounting part of rear swing link Cross-sectional development of the mounting part of the rear swing link Disassembled perspective view of mounting part of rear swing link (a) (b) (c) is an explanatory view of the action when raising and lowering the track frame Side view of essential part showing structure of attachment part of rear swing link of another embodiment

Explanation of symbols

1 Crawler traveling device 5 Airframe frame 15 Swing link (front swing link)
16 Swing link (rear swing link)
17 Track frame 40 Pivot shaft (Rear link free end shaft)
42 Rotating body (large diameter shaft)
46 Boss part 49 1st grease oil path 50 2nd grease oil path 51 Oil path P1, P2 1st horizontal axis (Axis core of the base part of a front swing link and a rear swing link)
P3 Second horizontal axis (axis of rotating body)
P4 shaft core (free end side shaft core of rear swing link)

Claims (4)

A work machine in which left and right track frames in a pair of left and right crawler traveling devices are supported on a machine frame so as to be movable up and down via a rocking link that is rocked about a first horizontal axis in the horizontal direction of the machine. ,
One of the swing link free end side and the track frame supports the outer peripheral portion of the rotating body so as to be rotatable about the second horizontal axis in the left-right direction of the machine body. A pivot shaft is provided on the other of the frames, and the pivot shaft is supported on the rotating body at a position in which the axis of the pivot shaft is offset from the second horizontal axis. Working machine.   The working machine according to claim 1, wherein a boss portion is formed on one of the swing link and the track frame, and an outer peripheral portion of the rotating body is supported on the boss portion.   A first grease oil passage is formed between the boss portion and the rotating body, and a second grease oil passage is formed between the rotating body and the pivot shaft. The working machine according to claim 2, wherein the two grease oil passages communicate with each other through an oil passage.   The work machine according to claim 1, wherein the rotating body is disposed on an upper portion of a track frame.

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