JPH08258762A - Crawler running device - Google Patents

Abstract

PURPOSE: To ensure a necessary fall angle without changing a distance between right and left crawlers and to eliminate the occurrence of a trouble, such as rapid deterioration of the contact surface part of the crawler with a rolling wheel. CONSTITUTION: The core protrusion part 13a of a crawler 7 guided by a groove part 10d of a rolling wheel 10 is offset to an external side based on a center between the right and left of a crawler 7 and the groove part 10d of the rolling wheel 10 is offset to an internal side based on a center between the right and the left of the 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 crawler traveling device provided on a combine or the like.

[0002]

BACKGROUND OF THE INVENTION Generally,
In a crawler type traveling vehicle, the tipping angle improves as the left and right crawler spacing (tread) is widened.However, if the crawler spacing is restricted due to the cutting width, such as a combine, the required tipping angle is It was not easy to secure. Therefore, it has been proposed to improve the fall angle by increasing the distance between the left and right rolling wheels without changing the distance between the left and right crawlers. That is, the core bar convex part of the crawler guided by the groove part of the rolling wheel is offset outward with respect to the left and right center of the crawler, but there is a limit to the offset amount of the core bar convex part, It is difficult to significantly increase the angle, and when the metal core protrusion is offset outward, the driving force per unit width of the crawler is high on the outside and low on the inside. There is a possibility that the surface pressure of the crawler may be deviated inside and outside, and as a result, the contact surface of the crawler for the rolling wheel (outer ring) may deteriorate early due to insufficient strength.

[0003]

SUMMARY OF THE INVENTION The present invention was devised with the object of providing a crawler traveling device capable of solving these problems in view of the above-mentioned circumstances, and has an inner circumference of the crawler. In a crawler traveling device that guides a metal core convex portion protruding on a surface by a groove portion of a rolling wheel, the core metal convex portion is offset outward with respect to a lateral center of the crawler, and a groove portion of the rolling wheel is formed. It is characterized in that it is offset inwardly with respect to the left-right center of. Moreover, the offset ratio of the core metal convex portion with respect to the left-right center of the crawler and the offset ratio of the groove portion with respect to the left-right center of the rolling wheel are substantially matched. Further, according to the present invention, with this configuration, a necessary tipping angle can be secured without changing the distance between the left and right crawlers, and the inconvenience that the rolling contact surface of the crawlers deteriorates at an early stage can be eliminated. Is.

[0004]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a combine traveling machine body, and the traveling machine body 1 includes a cutting section 2 connected to a front end of the machine body, a threshing selection section 3 provided on the left side of the machine body, and a grain tank provided on the right side of the machine body. 4, a straw treatment unit 5 provided at the rear of the machine body, a pair of left and right crawler traveling devices 6 provided at a predetermined interval on the bottom of the machine body, and the like. The load balance of the traveling machine body 1 Is set in advance so that the load on the left side is large when the vehicle is empty and the load on the right side is large when the grain is full, so it is possible to prevent the load balance from being largely biased to the right when the grain is fully loaded. ing.

The crawler traveling device 6 includes a drive sprocket 8 for driving and rotating an endless crawler 7 made of a rubber elastic material, an idler 9 for adjusting tension of the crawler 7, and a grounding portion of the crawler 7. It is configured to be suspended by wheel members such as a plurality of rolling wheels 10 that guide the inner surface, a movable rolling wheel 11 that moves up and down according to steps and irregularities, and an upper rolling wheel 12 that guides the inner surface of the anti-ground portion of the crawler 7. The above basic configurations are all conventional.

Reference numeral 13 denotes a cored bar embedded in the crawler 7 at a predetermined interval (suspending direction), and the cored bar 13
The pair of left and right convex portions 13a integrally formed with the crawler 7 are
It protrudes from the inner peripheral surface of and engages with the groove portion of the wheel 10, etc.,
The protruding position is offset outward with respect to the left-right center of the crawler 7, so that the outer width of the crawler 7 is "h" and the inner width is "i" with the left-right center of the protrusion 13a as a boundary. In this case, the inequality “h <i” is satisfied. That is, since only the guide position by the rolling wheels 10 is displaced outward without changing the outer width (l) of the left and right crawlers 7, a wide outer width (g) of the left and right rolling wheels 10 is secured and the traveling body 1 of the traveling machine body 1 is secured. The fall angle can be improved. Reference numeral 14 is a plurality of steel cords embedded in the lower vicinity of the core metal 13.

On the other hand, the plurality of rolling wheels 10 are the rolling wheel bosses 1.
It is formed in a so-called double flange type in which the inner ring 10b and the outer ring 10c are welded to 0a. Then, the core metal 1 is formed in the groove portion 10d formed between the inner ring 10b and the outer ring 10c.
3, the groove 10d of the rolling wheel 10 is offset inwardly with respect to the lateral center of the rolling wheel 10, and therefore the lateral center of the groove 10d serves as a boundary. When the outer width of 10 is “j” and the inner width is “k”, the inequality “j> k” is satisfied.
That is, without changing the outer width (l) of the left and right crawlers 7,
Since the outer end position of the rolling wheel 10 can be displaced outward, the outer width (g) of the left and right rolling wheels 10 that is widened based on the offset of the metal core convex portion 13a can be further widened. As a result, the falling angle of the traveling machine body 1 can be further improved. In this embodiment,
When the width of the outer ring 10c is "j '" and the width of the inner ring 10b is "k'", the relational expression "j / j '= k / k'" is established.

By the way, since the driving force of the drive sprocket 8 is distributed substantially evenly inside and outside the crawler 7, as described above, the convex portion 13a of the cored bar 13 with respect to the lateral center of the crawler 7. When offset to the outer side, the driving force per unit width of the crawler 7 increases within the range of the outer width (h), and the surface pressure of the outer ring 10c accordingly increases, but the center of the rolling wheel 10 in the left-right direction is increased. Since the offset ratio "j / k" of the groove portion 10d with respect to the "c" is made substantially equal to the offset ratio "i / h" of the convex portion 13a with respect to the lateral center of the crawler 7, the inner surface of the crawler 7 has an inner ring 10b and an outer ring 10c.
It is possible to eliminate the inconvenience that the outer ring contact surface portion of the crawler 7 deteriorates at an early stage.

Further, in this embodiment, as described above, the roller 1
In order to secure the wide outer width (g) of the left and right rolling wheels 10 by offsetting the groove portion 10d of 0, the outer end position of the rolling wheel 10 is made to substantially coincide with the outer end position of the core metal 13, and therefore the convex When the outer width of the cored bar 13 is "m" with the left-right center of the portion 13a as a boundary, the relational expression "j≈m" is established. That is, the outer width (g) of the left and right wheels 10
Is as wide as possible within the range not exceeding the outer end position of the cored bar 13. Reference numeral 15 is a pair of left and right track frames integrally provided on the bottom of the traveling machine body 1 in the front-rear direction, 16 is a wheel support shaft projecting outward from the track frame 15, and 17 is a wheel support shaft. 16 is a bearing provided between the wheel 16 and the wheel boss 10a.

Incidentally, the rolling wheel boss 10a of the rolling wheel 10
Is supported by the wheel support shaft 16 via the bearing 17,
While it is necessary to cover the openings on both sides with a cover member via a highly airtight seal member and to periodically inject grease from a grease nipple 19 provided at a predetermined position, a highly airtight seal member is required. It is expensive, and if the cover body is fixed by bolts, the weight is increased. Therefore, in this embodiment, the outer opening of the wheel boss 10a is covered with the cover 21 via the O-ring 20, and the peripheral edge of the cover 21 is fixed by caulking the outer end of the wheel boss 10a. However, since the grease nipple 19 is projectingly provided in the center of the cover 21, even if the grease leaks from the peripheral portion of the cover 21 at the time of injecting grease, it is easy to do so. And the grease nipple 19 is
Since it is provided so as to fit within the outer width of the grease, the grease nipple 19 can be protected from obstacles. Reference numeral 22 is a waterproof oil seal that seals the inner opening of the wheel boss 10a.

In the embodiment of the present invention configured as described above, the metal core convex portion 13a of the crawler 7 guided by the groove portion 10d of the rolling wheel 10 is offset outward with respect to the lateral center of the crawler 7, Moreover, since the groove portion 10d of the rolling wheel 10 is offset inward with respect to the left-right center of the rolling wheel 10, the outer width (g) of the left and right rolling wheels 10 can be secured as wide as possible. Even if there is a restriction on the left and right crawler intervals like a combine, it is possible to secure a necessary tipping angle.

Further, the protrusion 13a of the cored bar 13 is attached to the crawler 7
When offset to the left and right center of the
The driving force per unit width of the crawler 7 increases in the range of the outer width (h), and the surface pressure of the outer ring 10c accordingly increases, but the offset ratio "j / Since “k” is made substantially equal to the offset ratio “i / h” of the convex portion 13a with respect to the left-right center of the crawler 7, the inner surface of the crawler 7 abuts the inner ring 10b and the outer ring 10c with a substantially uniform surface pressure, and as a result, Therefore, it is possible to eliminate the inconvenience that the outer ring contact surface portion of the crawler 7 deteriorates early.

[0013]

In summary, since the present invention is constructed as described above, the metal core convex portion of the crawler guided by the groove portion of the rolling wheel is offset outward with respect to the lateral center of the crawler. Since the groove portion of the rolling wheel is offset inward with respect to the center of the rolling wheel left and right, it is possible to position the rolling wheel outward as compared with the case where only the protrusion of the metal core of the crawler is offset. Even if the left and right crawler intervals are restricted, such as a combine harvester, it is possible to secure a necessary tipping angle.

Further, when the offset ratio of the metal core convex portion with respect to the lateral center of the crawler and the offset ratio of the groove portion with respect to the lateral center of the rolling wheel are substantially matched, the driving force per unit width of the provisional crawler is the core. Even if the protrusions are offset due to the offset of the gold protrusions, the inside and outside of the crawler contact the rolling wheels with a substantially uniform surface pressure, and as a result, the rolling contact surface of the crawler deteriorates early. It can be resolved.

[Brief description of drawings]

FIG. 1 is a side view of a combine.

FIG. 2 is a side view of a crawler traveling device.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is an enlarged sectional view of the same.

FIG. 5 is a cross-sectional view of a grease nipple.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Traveling vehicle 6 Crawler traveling device 7 Crawler 10 Rolling wheel 10b Inner ring 10c Outer ring 10d Groove portion 13 Core bar 13a Convex portion

Claims (2)

[Claims] 1. A crawler traveling device in which a cored bar convex portion projecting on an inner peripheral surface of a crawler is guided by a groove part of a rolling wheel, wherein the cored bar convex part is offset outward with respect to a lateral center of the crawler. The crawler traveling device is characterized in that the groove portion of the rolling wheel is offset inwardly with respect to the lateral center of the rolling wheel. 2. The crawler traveling device according to claim 1, wherein the offset ratio of the metal core convex portion with respect to the lateral center of the crawler and the offset ratio of the groove portion with respect to the lateral center of the rolling wheel are substantially equal to each other.