JP2017210140A - Traveling device of working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the shortening of a pitching cylinder, and to solve a problem that a machine body frame of a working vehicle and a fuel tank interfere with a traveling crawler.SOLUTION: A traveling device of a working vehicle comprises: front-side left and right rolling arms (14) and rear-side left and right rolling arms (14) which turn by telescopic operations of left and right rolling cylinders (13), independently ascend and descend left and right traveling devices (2, 2) to left and right directions with respect to a vehicle body, and adjust left and right inclinations of the vehicle body; and a pitching arm (20) which turns by a telescopic operation of a pitching cylinder (19), ascends and descends turning axial cores of the rear-side left and right rolling arms (14) with respect to the vehicle body, and adjusts fore-and-aft inclinations of the vehicle body. A regulation member (24) for regulating the shortening of the pitching cylinder (19) caused by the leakage of working fluid of the pitching cylinder (19) is arranged between the rear-side rolling arms (14) and the pitching arm (20).SELECTED DRAWING: Figure 2

Description

  The present invention relates to a traveling device for a work vehicle such as a combine.

  Conventionally, in a work vehicle such as a combine vehicle, a rolling mechanism that adjusts the left and right traveling devices independently of the left and right sides of the vehicle body by the expansion and contraction operation of the left and right rolling arms and the rolling cylinder, and the pitching There has been known one provided with a pitching mechanism that adjusts the front-rear inclination of the vehicle body by the expansion and contraction operation of the arm and the pitching cylinder (for example, see Patent Document 1).

JP-A-6-72361

  The conventional pitching mechanism is configured to be controlled so as not to tilt backward when the vehicle height is below a certain level.

  However, if the hydraulic oil leaks in the cylinder or the oil supply path to the cylinder during storage with the vehicle height lowered to the lowest, the rear of the vehicle body falls and the fuselage frame and fuel tank interfere with the traveling crawler. Problems may occur.

  An object of the present invention is to avoid the above-mentioned interference problem.

  In order to solve the above problems, the present invention has taken the following technical means.

  That is, the invention according to claim 1 is rotated by the expansion and contraction operation of the left and right rolling cylinders (13), and the left and right traveling devices (2, 2) are lifted and lowered independently from the left and right of the vehicle body. The right and left rolling arms (14) on the front side and the left and right rolling arms (14) on the rear side that adjust the inclination, and the pitching cylinder (19) are rotated by the expansion and contraction operation of the left and right rolling arms (14) on the rear side. And a pitching arm (20) for adjusting the front / rear inclination of the vehicle body by raising and lowering the rotational axis of the vehicle body between the rear rolling arm (14) and the pitching arm (20), The working vehicle travel device is provided with a regulating member (24) for regulating shortening of the pitching cylinder (19) due to leakage of hydraulic oil in the pitching cylinder (19).

  According to a second aspect of the present invention, there is provided a traveling device for a work vehicle according to the first aspect, wherein the restricting member (24) is configured to be adjustable.

  According to a third aspect of the present invention, the restriction member (24) is divided into two in the length direction, and the two divided restriction members (24) are connected by a connecting bolt (26). It is set as the traveling apparatus of the working vehicle of claim | item 2.

  According to a fourth aspect of the present invention, the regulating member (24) is attached between an upper portion of the rolling arm (14) and an upper portion of the pitching arm (20). It is set as the traveling apparatus of the described working vehicle.

  According to a fifth aspect of the present invention, the restricting member (24) includes a plurality of steps in a plan view so as to correspond to a positional deviation in the left-right direction between the upper portion of the rolling arm (14) and the upper portion of the pitching arm (20). The working vehicle traveling device according to claim 1, claim 2, claim 3, or claim 4, which is formed in a bent shape.

  The invention according to claim 6 is characterized in that both ends of the restricting member (24) are one support pin (27) which is a connecting portion between the rolling cylinder (13) and the rolling arm (14), and the pitching cylinder ( 19. The work vehicle according to claim 1, claim 2, claim 3, claim 4, or claim 5, wherein the work vehicle is attached to each of the other support pins (27) which are connecting portions of 19) and the pitching arm (20). The traveling device.

  According to the first aspect of the present invention, by providing a regulating member that regulates the shortening of the pitching cylinder due to leakage of hydraulic oil in the pitching cylinder between the rolling arm and the pitching arm, the work vehicle can be lowered in height. Even when stored in a lowered state, the shortening of the pitching cylinder is suppressed, so that the problem of the airframe and the fuel tank interfering with the traveling crawler can be solved.

  According to the invention described in claim 2, in addition to the effect described in claim 1, since the restricting member can be adjusted to expand and contract, it is possible to cope with variations in production and to cope with the above-mentioned interference problem even in the market. It is.

  According to the invention described in claim 3, in addition to the effect described in claim 1 or 2, the restricting member connects the divided parts even when subjected to bouncing or irregular impact of the fuselage. When the connecting bolt is sheared, the connecting bolt serves as a safety pin and can prevent other important parts from being damaged.

  According to the invention of claim 4, in addition to the effect of claim 1 or claim 2 or claim 3, the mounting position of the restricting member is between the upper part of the rolling arm and the upper part of the pitching arm. Although it can be easily adjusted, it is less affected by mud such as wet fields and sawdust, and the operating state can be maintained smoothly.

  According to the fifth aspect of the invention, in addition to the effect of the first aspect, the second aspect, the third aspect, or the fourth aspect, the restricting member is refracted in a plurality of stages in a plan view. Even when an irregular impact is received, it can absorb the shock and act as a safety device, preventing other important parts from being damaged.

  According to invention of Claim 6, in addition to the effect of Claim 1 or Claim 2 or Claim 3 or Claim 4 or Claim 5, with one support pin which is a connection part of a rolling cylinder and a rolling arm, Because the restricting member is attached to each of the other support pins that are the connecting part of the pitching cylinder and the pitching arm, the mounting shaft can be shared, the number of parts can be reduced, and assembly and adjustment are easy it can.

Combine side view Side view of the rolling / pitching mechanism of the traveling device Top view of the main part (A) Side view of the main part, (b) Plan view Side view of the main part showing the restriction position by the restriction member Side view of the main part showing the highest position of the car body Side view of the main part showing the vehicle body lowest position Hydraulic circuit diagram

  An embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 shows a self-removing combine harvester that harvests and threshs a stalk that rises on a field while self-propelled, and has a pair of left and right traveling devices, that is, a vehicle body 1 having traveling crawlers 2 and 2 at the bottom. On the front side, the cereals that have been weeded with the weeding tool are pulled up and raised by the device and cut by the cutting blade device 3, held and conveyed rearward and upward, and delivered to the fluid chain 5 of the threshing device, and the fluid chain 5. The threshing section 6 for threshing the cereal mash supplied to the handling chamber is provided, and the reaping section 4 is moved up and down via a reaping lift cylinder 7.

  The right side of the harvesting part 4 is provided with a control part provided with a driver's seat 8, and the rear part of the harvesting part 4 is provided with a Glen tank 9 for temporarily storing the threshed grain, which is stored in the Glen tank 9. A discharge auger 10 is provided for discharging the grain out of the machine.

  The discharge auger 10 is configured to turn left and right by a motor (not shown) and to move up and down by an auger lifting cylinder 11.

  When the vehicle body 1 tilts in the left-right direction when the traveling crawler 2 on one side of the left and right side sinks more greatly in the field than the other side, the left-right tilt angle of the vehicle body 1 by the ON operation of the left-right switch in the control unit or the left-right tilt sensor Is output from the control device, and the left or right rolling cylinder 13 is expanded and contracted, and the rear rolling arm 15 and the connecting arm 21 are supported by the front rolling shaft 22 on the vehicle body 1 side. The rear rolling arm 16 pivotally supported by the rolling shaft 23 </ b> R moves the left or right crawler frame 18 up and down in parallel by forming a parallel link by the connecting rod 17. In this manner, the left and right traveling crawlers 2 are lifted and lowered independently with respect to the vehicle body 1, whereby the vehicle body can be subjected to rolling control in a horizontal state in the left-right direction.

  The connecting rod 17 is connected between the upper end portion of the upper arm 15 a of the front rolling arm 15 and the intermediate portion of the upper arm 14 of the rear rolling arm 16.

  The base portions of the left and right rolling cylinders 13 are suspended and supported from the vehicle body 1 via the link R, and the rear ends of the pitching arms 20 are pivotally supported by the base portions of the left and right rolling cylinders 13. The front end of the connecting plate S is pivotally supported.

  Further, when the vehicle body 1 tilts in the front-rear direction because the amount of settlement of the left and right traveling crawlers 2, 2 differs between the front part and the rear part, the front-rear switch of the front-rear switch or the front-rear tilt sensor in the front-rear tilt sensor is operated. Based on the detection result of the tilt angle, an output is made from the control device to cause the pitching cylinder 19 to expand and contract, and the pitching arm 20 pivotally supported by the fulcrum Q on the vehicle body 1 side rotates up and down. As a result, the rear left and right rolling arms 14 that are pivotally supported by the connecting arm 21 are lifted and lowered together with the rotation fulcrum via the connecting arm 21 that is pivotally supported by the front portion of the pitching arm 20. As a result, the rear side of the left and right crawler frames 18 can be moved up and down with the front rolling shaft 22 as a fulcrum, and the vehicle body can be controlled to be pitched horizontally in the front-rear direction.

  The base portion of the pitching cylinder 19 is pivotally supported by a stay fixed on the vehicle body 1.

  Between the upper end portion of the rolling arm 14 that connects the rolling cylinder 13 and the upper end portion of the pitching arm 20 that connects the pitching cylinder 19, a regulating member 24 that suppresses the movement of the pitching cylinder 19 in the shortening direction is provided. Yes.

  During storage, the pitching cylinder continues to be loaded in the shortening direction due to the weight of the vehicle body. As a result, the pitching cylinder is shortened due to hydraulic pressure leaks in the pitching cylinder and the oil feed path to the pitching cylinder. For this reason, a regulation collar for preventing shrinkage may be directly attached to the piston of the pitching cylinder. However, it takes time to attach and detach, and the mechanism member may be damaged due to forgetting to remove it. If the restricting member is provided by utilizing the correlation between the pitching arm and the rolling arm as in this example, it does not take time to attach and detach, and it works effectively without forgetting to remove the mechanical parts. .

  The restricting member 24 may be provided on either one of the left and right rolling arms 14, 14, but may be provided on the right rolling arm on the 9 side of the glen tank (which can be opened) for easy assembly and adjustment (FIG. 2). And 3).

  The regulating member 24 is divided into two parts in this example, and is configured to be adjustable in expansion and contraction via a long hole 25 and a connecting bolt 26. In addition, this expansion / contraction adjustment can also be comprised with a turnbuckle.

  Further, both end portions of the restricting member 24 are pivotally supported by support pins 27 and 27 with respect to the rolling cylinder 13 and the pitching cylinder 19, and the connecting bolts 26 of the divided portions of the restricting member 24 are supported by the support pins 27 and 27. The pin 27 has a diameter smaller than that of the pin 27 and is sheared when receiving a shock, thus serving as a safety pin.

  The regulating member 24 is easily assembled and adjusted by being attached to the upper part of the rolling arm 14 and the pitching arm 20, and is not easily affected by mud such as wet fields and sawdust.

  Moreover, as shown in FIG. 4, by forming in Z shape by planar view, a shock can be absorbed, the damage of other important parts can be prevented, and the role of a safety device can fully be fulfilled.

  Both ends of the regulating member 24 are attached to the support pins 27 of the rolling cylinder 13 and the rolling arm 14 and the support pins 27 of the pitching cylinder 19 and the pitching arm 20. According to this, the mounting shaft can be shared, and the number of parts can be reduced, and assembly and adjustment can be easily performed.

  Further, slide holes 28 are provided at both ends of the restricting member 24, and the support pin 27 slides in the slide hole 28 during a normal pitching (rolling) operation. There is nothing.

  If the restricting member 24 itself is made of spring steel, the impact can be absorbed by the elastic action of the spring steel, and there is an effect as a damper that prevents damage to important parts.

  FIG. 5 shows the restricting position by the restricting member 24 at 12 mm up. In this case, even if a leak occurs while the engine is stopped, it does not drop any further.

  FIG. 6 shows the vehicle body raised position, and FIG. 7 shows the vehicle body lowered position state.

  In the hydraulic circuit of FIG. 8, reference numeral 30 denotes a direction control push cylinder, and 31 denotes a running / turning clutch.

1 Car body 2 Traveling device (traveling crawler)
DESCRIPTION OF SYMBOLS 13 Rolling cylinder 14 Rolling arm 15 Front rolling link 16 Rear rolling link 18 Crawler frame 19 Pitch cylinder 20 Pitching arm 21 Connection arm 22 Rolling shaft 24 Restriction member 25 Long hole 26 Connection bolt 27 Support pin

Claims (6)

  The left and right rolling arms on the front side are rotated by the expansion and contraction operation of the left and right rolling cylinders (13), and the left and right traveling devices (2, 2) are moved up and down independently of the vehicle body to adjust the vehicle body inclination. (14) and the left and right rolling arms (14) on the rear side and the pitching cylinder (19) are rotated and retracted, and the rotation axis of the left and right rolling arms (14) on the rear side with respect to the vehicle body A pitching arm (20) that moves up and down to adjust the front / rear inclination of the vehicle body is provided. Between the rear rolling arm (14) and the pitching arm (20), hydraulic oil of the pitching cylinder (19) is provided. A traveling device for a work vehicle provided with a regulating member (24) for regulating shortening of the pitching cylinder (19) due to leakage.   The traveling device for a work vehicle according to claim 1, wherein the restricting member (24) is configured to be adjustable.   The travel of the work vehicle according to claim 1 or 2, wherein the restriction member (24) is divided into two in the length direction, and the two divided restriction members (24) are connected by a connecting bolt (26). apparatus.   4. The work vehicle traveling device according to claim 1, wherein the regulating member is attached between an upper portion of the rolling arm and an upper portion of the pitching arm.   The restricting member (24) is formed in a shape refracted in a plurality of stages in plan view so as to correspond to a positional deviation in the left-right direction between the upper part of the rolling arm (14) and the upper part of the pitching arm (20). 5. A traveling device for a work vehicle according to claim 1 or claim 2, or claim 3 or claim 4.   Both ends of the restricting member (24) are one support pin (27) that is a connecting portion between the rolling cylinder (13) and the rolling arm (14), the pitching cylinder (19), and the pitching arm (20). 6. The traveling device for a work vehicle according to claim 1, 2, 3, 4, or 5, which is attached to each of the other support pins (27) that are the connecting portions of).

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