JPH07117735A - Travel device of working vehicle - Google Patents

Abstract

PURPOSE:To maintain a stable traveling state by preventing a rocker rolling wheel from coming off a crawler belt in time of riding over a projection part. CONSTITUTION:A rocker rolling wheel 10 is set up in an interspace between a fixed rolling wheel 8 at the front and another fixed rolling wheel 9 at the rear in a group of rolling wheels 4 in a travel device. At this time, one end of a rocker arm 11 is pivoted to an intermediate part free of vertical rotation in the longitudinal direction of a rolling wheel frame 3, while a free end side of this rocker arm 11 is extended frontwards or rearwards and the rocker rolling wheel 10 is pivoted to this end part. In addition, an guide part 13 being engageable with an engaging aprt to be formed on an inner circumferential surface of a crawler belt 6 is formed in a lower edge of the rocker arm 11, with which this guide part 13 is constituted so as to be engaged with the engaging part 12 in time of an upward movement of the rocker rolling wheel 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling device for a working vehicle such as a combine.

[0002]

2. Description of the Related Art Conventionally, a traveling device for a working vehicle such as a combine has left and right traveling devices of an endless track type. The traveling device is configured by arranging drive wheels driven by a mission, a group of rolling wheels supported by a rolling frame and an idle wheel in the front-rear direction, and winding a crawler belt over them. is there.

Further, such a traveling device has a structure in which a so-called oscillating rolling wheel is provided, which is capable of vertically moving a rolling wheel provided in an intermediate portion in the front-rear direction of the rolling wheel group. When the working vehicle climbs over a step such as when crossing a ridge in a combine, the swaying roller moves upward so as to absorb the push-up due to the step, thereby preventing a sudden change in posture of the working vehicle. is there.

Further, in such a traveling apparatus, a longitudinally long guide member provided from the rolling wheel frame side is engaged with an engaging portion formed in the widthwise central portion of the inner peripheral surface of the endless track zone. There is a combined configuration. With this engagement configuration,
It is possible to prevent the wheel group from slipping out of the endless track zone.

[0005]

In the above-described conventional traveling apparatus for a working vehicle, the fixed rolling wheels are provided immediately before and immediately after the rocking rolling wheels. Therefore, when the vehicle travels over a step, the step pushes up the endless track zone corresponding to the space immediately before and immediately after the fixed rolling wheel, whereby the rocking rolling wheel also moves upward. In such a state, the pushed up crawler belt is likely to be twisted, and when the fixed rolling wheel interval immediately before and immediately after is large, the rocking rolling wheel is easily removed from the crawler belt. . When the oscillating rolling wheels are derailed from the endless track zone, the other rolling wheel groups are also derailed in a chain and fall into a traveling-disabled state.

Further, in order to prevent the rocking rolling wheel from coming off,
When an oscillating guide member is provided near the oscillating rolling wheel and the guide member is always engaged with the engaging portion of the endless track,
The structure becomes complicated and becomes expensive, so that there is no cost merit.

[0007]

In order to solve the above-mentioned problems, the present invention takes the following technical means.
That is, the drive wheels 2 driven by the mission 1, the wheel group 4 and the idler wheels 5 supported by the wheel frame 3 are arranged in the front-rear direction, and the endless track zone 6 is wound around them. In the traveling device 7 described above, one end portion of the swing arm 11 is arranged in order to arrange the swing roller 10 between the front fixed roller 8 and the rear fixed roller 9 of the wheel group 4. The roller frame 3 is vertically rotatably attached to an intermediate portion in the front-rear direction, and the free end side of the swing arm 11 is extended forward or rearward so that the swing roller is provided at this end. 10 is pivotally supported, while a guide portion 13 engageable with an engaging portion 12 formed on the inner peripheral surface of the endless track zone 6 is formed at the lower edge of the swing arm 11. Therefore, the guide portion 13 is configured to engage with the engaging portion 12 when the swinging wheel 10 moves upward. It is obtained by the construction of the traveling device of a working vehicle.

[0008]

In the traveling device 7 for a working vehicle according to the present invention, when the drive wheel 2 is driven forward by the mission 1, the drive wheel 2 is wound around the wheel group 4 and the idler wheel 5 supported by the wheel frame 3. The tracked track 6 is driven forward, and the working vehicle travels forward. When the working vehicle gets over a convex portion of a traveling surface such as a ridge, first, the traveling device 7 is driven forward so that the fixed wheel 8 at the front of the traveling device 7 rides on the convex portion. Then, after this, between the front fixed roller 8 immediately before the oscillating roller 10 and the rear fixed roller 9 immediately after the oscillating roller 10, a part of the endless track zone 6 corresponding to this position is formed by the convex portion. Pushed up. Along with this, the rocking roller 10 is also pushed up, and the rocking arm 11 supporting the rocking roller 10 rotates upward. As a result, the guide portion 13 formed at the lower edge portion of the swing arm 11 approaches the inner peripheral surface of the pushed up endless track zone 6 and engages with the engaging portion 12 formed therein. become.

As a result, the pushed up crawler belt 6 is not twisted, and the rocking roller 10 can be prevented from slipping out of the crawler belt 6. Therefore,
It is possible to maintain a stable traveling state without the traveling device 7 falling into a traveling-disabled state. Also,
Since the guide portion 13 that engages with the engaging portion 12 on the inner peripheral surface of the endless track zone 6 is formed integrally with the swing arm 11 that supports the swing roller 10, the guide portion 13 is It is not necessary to specially provide it as a separate member, and an inexpensive structure can be obtained.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described by taking a combine as an example. The combine fuselage is equipped with a threshing device 15, a grain storage device 16, a control unit 17, an engine 18 and the like above the machine frame 14, and on the lower left and right sides of the machine frame 14 as well. A vehicle body 19 is configured by providing the traveling devices 7 and 7, and a cutting device 20 is provided in front of the vehicle body 19 so as to be vertically movable.

Then, a mission case 21 for mounting the mission 1 is fixed to the front side position of the machine frame 14. Then, from the lower part of the transmission case 21, drive shafts 22, 22 which are covered and borne by a drive shaft cylinder are projected in the left-right direction, and sprocket-shaped drive wheels 2, 2 are provided at the tips of the drive shafts 22, 22. Attach 2. As a result, the drive wheels 2 and 2 are arranged at the lower left and right front portions of the machine frame 14. In addition, the mission case 2
1, the driving force of the engine 18 is input.

The structure of the traveling device 7 on the left and right sides of the traveling devices 7, 7 will now be described. The traveling device 7 is configured to be bilaterally symmetrical. The machine frame
On the left and right sides below the frame 14, there are long and short rolling wheel frames.
The frame 3 is arranged so that the front end thereof faces the lower rear of the drive wheel 2. The roller frame 3 is composed of a frame body having a U-shaped cross-section with an open bottom, or a square pipe material. The machine frame 14 and the wheel frame 3 are connected and fixed by a frame foot F. A space 23 is formed at the intermediate portion of the wheel frame 3 in the front-rear direction so that the lower edge of the wheel frame 3 is cut upward in an arc shape.

The front fixed rollers 8, 8 are pivotally supported from the front end of the wheel frame 3 to the position immediately before the space 23. Further, from the position immediately after the space portion 23 to the rear end portion of the roller frame 3, the rear fixed rollers 9, 9, 9, 9 are pivotally supported. The front fixed rollers 8, 8, 8 and the rear fixed rollers 9, 9, 9, 9 are
A rolling wheel shaft 26 is rotatably supported by a bearing 25 on a boss 24 welded to the rolling wheel frame 3, and has a diameter larger than that of the boss portion 24 at the left and right protruding ends of the rolling wheel shaft 26. It is configured by attaching the bowl-shaped rolling wheels 27, 27.

Further, the idler wheel 5 is attached via a tension adjusting device 28 by further displacing it from the upper rear end of the wheel frame 3. The idler wheel 5 is the tension adjusting device 2
By the adjusting operation of 8, the position in the front-rear direction with respect to the wheel frame 3 is changed. In addition, the wheel frame
Upper support wheels 29, 29 are rotatably provided at two upper portions of the intermediate portion in the front-rear direction of the frame 3.

However, in front of the space 23 of the wheel frame 3, the front end of the swing arm 11 is connected to the swing shaft 3.
With 0, it is pivotally attached so that it can rotate up and down. Then, the swing roller 10 is attached to the rear end of the swing arm 11 which is the free end. The oscillating roller 10 rotatably supports an oscillating roller shaft 34 via a bearing 33 with respect to a boss portion 32 formed at the rear end of the oscillating arm 11.
The left and right protruding end portions of No. 4 are mounted with bowl-shaped swinging wheel portions 35, 35 having a diameter larger than that of the boss portion 32. With this configuration, the oscillating roller 10 can move up and down in the space 23. A winding spring 31 is wound around the swing shaft 30, one end of the winding spring 31 is engaged with an edge portion of the wheel frame 3 on the side of the space portion 23, and the other end thereof is rocked. The moving arm 11 is locked in the middle part.
As a result, the swing arm 11 is always urged to rotate downward.

At the lower edge portion of the swing arm 11 thus constructed, a guide portion 13 which is slightly wider than the main body of the swing arm 11 is formed. The rear end portion of the guide portion 13 is formed in an arc shape along the lower outer circumference of the swing roller 10. Further, the rear end portion of the guide portion 13 and the boss portion 32 are integrally formed. On the other hand, the endless track zone 6 is called a crawler, and is mainly composed of a rubber endless belt integrally formed with a large number of lugs on the outer surface of the winding, and an endless steel wire is embedded in the winding direction. However, a large number of metal cores with protrusions are embedded at predetermined intervals in the width direction orthogonal to the winding direction. The protrusions 36 of the cored bar with protrusions are provided in a pair at a predetermined interval in the center portion in the width direction. The pair of protrusions 36, 36 are the engaging portion 12.

The crawler belt zone 6 constructed as described above is used to drive the drive wheel 2, fixed rollers 8, 8 and 8 at the front, and rocking roller 1.
No. 0, the rear fixed rollers 9, 9, 9, 9, the idler wheel 5, and the upper support rollers 29, 29 are wound around one traveling device 7. As a result, the drive wheel 2 and the idler wheel 5 pass between the pair of protrusions 36, 36 with respect to the pair of protrusions 36, 36 of the core bar with protrusions of the endless track zone 6.
The front fixed rollers 8, 8, 8, the swinging roller 10, the rear fixed rollers 9, 9, 9, 9 and the upper support rollers 29, 29.
Will pass through both sides of the pair of protrusions 36, 36.

When the drive wheels 2 are driven forward by the mission 1, the endless track 6 is driven forward and the vehicle body 19
Moves forward. When the combine climbs over a convex portion of the traveling surface such as a ridge, first, the fixed rolling wheel 8 at the front of the forefront of the traveling device 7 rides on the convex portion. Then, thereafter, in the space portion 23 formed between the front fixed roller 8 immediately before the oscillating roller 10 and the rear fixed roller 9 immediately after the oscillating roller 10, the crawler belt zone 6 corresponding to this position in the space 23 is formed. A part is pushed up by the convex portion. Along with this, the rocking roller 10 is also pushed up against the downward biasing force of the winding spring 31, and the rocking arm 11 supporting the rocking roller 10 is rotated upward. As a result, the guide portion 13 formed at the lower edge portion of the swing arm 11 causes the pushed-up endless track zone 6 to move.
It approaches the inner peripheral surface and engages with the engaging portion 12 formed on the inner peripheral surface, that is, between the pair of protrusions 36, 36. Since the rear end portion of the guide portion 13 has a shape along the outer periphery of the lower portion of the swing roller 10 as described above, the engaging portion 1 is initially formed.
2 is engaged.

As a result, it is possible to prevent the rocking roller 10 from coming off the endless track belt 6 without being twisted in the pushed up endless track belt 6. Therefore,
It is possible to maintain a stable traveling state without the traveling device 7 falling into a traveling-disabled state. Also,
The rocking shaft 30 that pivotally supports the rocking arm 11 is arranged in front of the rocking roller 10 and is set to a substantially center height in a normal vertical moving height range of the rocking roller 10. This allows
Even if the oscillating roller 10 moves up and down largely, the back-and-forth movement associated therewith can be suppressed to a small level, and therefore can be oscillated by a small vertical oscillating load. For this reason, during high-speed running, the followability of the up-and-down swing of the swing roller 10 to the unevenness of the running surface becomes good. Further, when the swing shaft 30 is at a high position, the swing roller 10 is pushed forward when the traveling device 7 is driven backward, and an excessive load is applied to the swing shaft 30 and the swing arm 11. There was a risk of damage. In order to deal with this, it is necessary to increase the strength of the swing shaft 30 and the swing arm 11. However, with the above-described configuration, when the traveling device 7 moves backward, the oscillating roller 10 easily escapes upward, and therefore the force pushed forward is small. Therefore, the oscillating shaft 30 and the oscillating gear are not moved. -It is not necessary to increase the strength of the frame 11, and the members can be quantified.

Further, a raising side positioning hole 37 and a swinging lower limit regulating hole 38 are provided below the raising side positioning hole 37 at a position near the swinging shaft 30 of the wheel frame 3. The raising side positioning hole 37 and the swinging lower limit regulating hole 38 are provided on both side plates of the roller frame 3. A swing lower limit regulating pin 39 is inserted into and installed in the swing lower limit regulating hole 38, so that the swing arm 11 comes into contact with the swing lower limit regulating pin 39 so that the swing arm 11 can be held. Downward rotation of a predetermined amount or more is regulated. As a result, it is possible to prevent the rocking roller 10 from swinging too much downward when the vehicle rides over the convex portion of the running surface, which becomes a driving load on the endless track zone 6.

On the other hand, over the raising side positioning hole 37 and the engaging hole penetrating a part of the swing arm 11,
By inserting the raising side positioning pin 40, the swinging arm 11 can be fixed at the upper rotating position.
As a result, the oscillating rolling wheel 10 is fixed at a position where it floats above the inner peripheral surface of the endless track zone 6, and the work of winding the endless track zone 6 around each of the rolling wheel groups or detaching it is facilitated. You will be able to do that.

[Brief description of drawings]

FIG. 1 is a side view of a main part in an embodiment of the present invention.

FIG. 2 is an enlarged side view of a main part in one embodiment of the present invention.

FIG. 3 is an explanatory view of the operation of the main part in one embodiment of the present invention.

FIG. 4 is an explanatory view of the operation of the main part in one embodiment of the present invention.

FIG. 5 is a plan view for explaining a main part in one embodiment of the present invention.

FIG. 6 is a side view of the combine in the embodiment of the present invention.

[Explanation of symbols]

 1 Mission 2 Drive Wheel 3 Rolling Wheel Frame 4 Rolling Wheel Group 5 Idler Wheel 6 Endless Track Zone 7 Traveling Device 8 Front Fixed Rolling Wheel 9 Rear Fixed Rolling Wheel 10 Swing Rolling Wheel 11 Swinging Arm 12 Engagement Joint Department 13 Information Department

Claims (1)

[Claims] 1. A drive wheel 2 driven by a mission 1.
And a wheel group 4 and an idler wheel 5 supported by the wheel frame 3.
And are arranged in the front-rear direction, and the orbital zone 6
In the traveling device 7 configured by winding the
In order to arrange the oscillating roller 10 between the front fixed roller 8 and the rear fixed roller 9, one end of the oscillating arm 11 is arranged in the front-rear direction of the roller frame 3. The swing arm 11 is rotatably pivoted up and down, and the free end side of the swing arm 11 is extended forward or rearward to axially support the swing roller 10. At the lower edge of the swing arm 11,
A guide portion 13 that is engageable with an engagement portion 12 formed on the inner peripheral surface of the endless track zone 6 is formed, so that the guide portion 13 engages with the engagement portion 12 when the rocking roller 10 moves up. A traveling device for a working vehicle, which is configured to