JPH0223501Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a traveling crawler for industrial machinery such as construction machinery, civil engineering machinery, or agricultural machinery.

(b) Prior Art Conventional crawlers for industrial machinery are already known, in which a large number of rolling wheels are supported on a track frame that supports a driving sprocket and an idler wheel.

(c) Problems to be solved by the invention The known traveling crawler has a large number of rolling wheels pressed against the ground side so that the ground contact surface forms a substantially straight line while running, so that local high place,
For example, when climbing over a ridge or the like, the middle part of the crawler will head up significantly just before reaching the top of the high place, and the front part will drop rapidly just after crossing it, making it extremely unstable. When the middle part of the crawler floats, the rolling wheels come off the core metal of the crawler, making it easy for the crawler to come off.

(d) Means for Solving the Problems The present invention provides a structure in which a crawler is stretched between a drive sprocket and an idler wheel 11, and a plurality of rollers in contact with the upper surface of the crawler on the ground side are supported on a track frame that supports the idler wheel. In the traveling crawler, a movable wheel is interposed between the ground contact side and the upper return side of the crawler and between the drive sprocket and the idler wheel, and the movable wheel is supported on the track frame via a swing arm. death,
The movable wheel has a large diameter so as to be in contact with the ground contact side and the return side of the crawler at the same time, and by configuring the movable wheel to suppress the upward movement of the movable wheel by the tension on the return side of the crawler, the crawler can lower the height of the road surface. When the crawler runs over a surface, the middle part of the crawler bends to accommodate the convex part, and the upper part of the crawler suppresses the rise through the movable wheels, causing the crawler to suddenly head up or take a downward position all at once. The above-mentioned problem was solved by preventing the crawler from coming off.

(E) Action When the crawler runs onto a high place such as a ridge and its intermediate part reaches the vicinity of the ridge, the movable wheel is supported by the swing arm and is pushed up by the ground side of the crawler, causing the aircraft to The head up is reduced, and at this time, the upper part of the movable wheel is received by the return side of the crawler, so its rise is suppressed and an appropriate supporting force is obtained.

Further, when the intermediate portion of the crawler crosses the ridge, the crawler assumes a descending position, but since the intermediate portion is pushed up and curved at that time, the inclination is gentle and stable running is possible.

Further, when the crawler is in a state where it spans between a low part and a high place, the movable wheel contacts and restricts the ground side of the crawler, so that it is possible to prevent the crawler from coming off.

(F) Example An example of the present invention will be explained with reference to the drawings.
Reference numeral 1 denotes a track frame in which a combine harvester stand 2 is supported by support frames 3, and left and right crawlers 5, 5
Drive sprockets 8, 8 are attached to axles 7, 7 that protrude from the front transmission case 6 to both left and right sides, and a floating sprocket supported at the rear of the track frame 1 by a push rod 9 and a support member 10 that can move back and forth. Rolling wheels 12, which are stretched between the wheels 11 and pivotally supported near the front and rear sides of the track frame 1, protrude from the core metal along the center line of the inner circumferential surface of the crawler 5. It rolls between rows of protrusions 13.

A movable ring 15 having a diameter slightly larger than the vertical spacing between the crawlers 5 and 5 is installed in the middle of the crawlers 5, 5, and the movable ring 15 is supported on the track frame 1 by a support shaft 16 so that it can swing vertically The protrusion 13 is rotatably supported by a swinging arm 17.
rolling between the rows.

Further, as shown in FIGS. 4 to 7, the push rod 9 is fitted into a pipe 18 that is integral with the track frame 1 so as to be slidable back and forth, and a disc 21 is welded and fixed to the front end of the pipe 18. There is a push bolt 22 in the hole.
is inserted, but there is a nut 23 for tightening it.
has a substantially U-shape in plan view, and is fitted into a holder 25 whose rear end is welded 24 to the pipe 18. When tensioning the crawler 5, loosen the lock nut 26 and use the push bolt 22 to tighten the push rod 9. push out,
Tighten lock nut 26.

Conventionally, the nut 23 has been welded to the pipe 18 as shown in FIG. 7, so rainwater or mud adheres to the nut 23 during work, and it rusts and corrodes while stored for a long period of time. In such cases, the push bolt 22 could be replaced, but the nut 23 had to be replaced by melting and then welded.
It is sufficient to simply remove the nut 23 and replace it, and since the welded part of the retainer 25 that holds the nut 23 is far away from the axis, it can withstand high loads.

Further, since the push rod 9 and support member 10 of the boss 27 that supports the shaft of the idler wheel 11 are loosely fitted into the upper pipe 18 and the cylindrical body below it, when running resistance is applied, the push rod 9 etc. There was a drawback that the rear part was pushed outward and became V-shaped in plan view as shown in FIG. 11, reducing the propulsion force, but as shown in FIG. If the angle with the push rod 9 is set to 90° - α (however, the pipe 18 is parallel to the running direction), when the push rod 9 tilts outward from the running resistance, the support shaft will be at approximately 90° with respect to the running direction. As a result, the crawlers 5, 5 become parallel to the traveling direction as shown in FIG. 10, and the propulsive force can be improved.

FIG. 9 shows another support device for the idler wheel 11, in which the same result can be obtained by setting the angle between the pipe 18 and the lateral support frame to 90° + α (however, the push rod 9 and the idler wheel 11 axes are perpendicular).

Next, another example of the idler wheel support device will be explained with reference to FIGS. 12 and 13. Conventionally, the end of the idler wheel 11 side of the pipe supporting the push rod 9 was perpendicular to its length direction, so the crawler When the crawler gets caught in a stone or tries to come off due to an abnormally large tension such as when going over a ridge, the tension of the crawler is held at the end of the pipe, causing the push rod to break. However, if the ends of the pipes 18, 18a and the ends of the cylindrical holding parts 30, 30a of the boss 28 are tilted in side view as shown in the figure, the load will be distributed in the front and rear direction, thereby The above drawbacks can be overcome.

Moreover, the pipes 18, 18a and the cylindrical holding part 30,
Instead of separating the pipes 18 and 18a back and forth as in the previous example, the pipes 18 and 18a are attached to the cylindrical holding part 3 as shown in FIG.
0 and 30a to form a double structure, it is possible to prevent the push rod 9 and the support member 10 from breaking as in the previous example, and also to prevent the push rod 9 and the support member 10 from breaking.
Since these are not exposed, mud will not adhere to them, the push rod 9 and the support member 10 can be smoothly adjusted in advance and retreat, and rust can be prevented.

(g) Effects of the invention As described above, the invention includes a crawler 5 that is stretched between the drive sprocket 8 and the idler wheel 11, and the idler wheel 11
In a running crawler in which a plurality of wheels 12 contacting the upper surface of the grounding side of the crawler 5 are pivotally supported on a track frame 1 supporting A movable ring 15 is interposed between the idler wheels 11, and the movable ring 1
5 is supported on the track frame 1 via a swing arm 17, and the movable ring 15 is made large in diameter so as to contact the grounding side and the return side of the crawler 5 at the same time, so that the movable ring 15 can move upwardly. Since the configuration is such that the tension is suppressed by the tension on the return side, when the crawler 5 climbs over a high place such as a ridge, when the middle part of the crawler 5 approaches the high place, the movement is suppressed from rising on the return side. It rises together with the wheels 15 and enters a bent state, and the front part does not rise significantly and the height at which it descends is reduced, so the stability of the aircraft body is significantly improved.

Further, when the front part of the crawler 5 touches the ground on a flat area and the rear part runs up on a high place and becomes a hanging shape, the idler wheel 11 is forcibly pushed down on the return side of the crawler 5. Since the grounding side is restricted, it is possible to prevent the crawler from coming off.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention,
Figure 1 is a side view of the traveling crawler, Figure 2 is a side view of the idler wheel support, Figure 3 is a cross-sectional view of the same as above, Figure 4 is a side sectional view of the push rod support, and Figure 5 is a flat view of the same as above. 6 is a perspective view of the holder, FIG. 7 is a sectional view of the conventional example, FIG. 8 is a plan view showing another example of the floating wheel shaft support, FIG. 9 is a plan view of a modified example of the same, and FIG. Fig. 10 is a plan view showing the running state of the same crawler as above, Fig. 11 is a plan view of the conventional example same as above, Fig. 12 is a side sectional view of another push rod support device, and Fig. 13 is a side sectional view of the main part of same as above. , FIG. 14 is a side sectional view showing another example of the pipe support section. 1...Orbital frame, 5...Crawler, 8...
Drive sprocket, 11... Idle wheel, 15... Movable wheel, 17... Swinging arm.

Claims (1)

[Scope of utility model registration request] Drive sprocket 8 and idler wheel 11 with crawler 5
In this traveling crawler, a plurality of rolling wheels 12, which are in contact with the upper surface of the ground contact side of the crawler 5, are pivotally supported on the track frame 1 which supports the idler wheels 11, and the ground contact side and the upper return side of the crawler 5. A movable wheel 15 is interposed between the drive sprocket 8 and the idler wheel 11, and the movable wheel 15 is supported on the track frame 1 via the swing arm 17. A traveling crawler characterized in that the movable wheel has a large diameter so as to be in contact with the ground contact side and the return side at the same time, and is configured so that the upward movement of the movable wheel is suppressed by the tension on the return side of the crawler.