JPS6322154Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a drive device that connects and fixes a transmission case to a main frame, connects a truck frame to the main frame via a link so that it can be adjusted up and down, and drives the link to swing. Further, a tension frame is provided at the end of the track frame, and a tension frame that can be freely adjusted forward and backward with respect to the track frame is provided, and a tension roller is attached to the protruding end of the tension frame. The present invention also relates to a crawler traveling device for a mobile agricultural machine in which a crawler belt is wound and tensioned around this tension roller, a drive sprocket that is pivotally supported on the transmission case, and a group of rolling wheels that are pivotally supported on the truck frame. It is.

The above-mentioned crawler running device was developed to improve running performance in wet fields, but when adjusting the track frame up and down, it is necessary to adjust the tension roller in and out in order to properly tension the crawler belt. Ru.

As one means for eliminating such tension adjustment operations, for example,
An automatic tension system is known, such as the one disclosed in Japanese Patent No. 38651, in which the tension roller is constantly tensioned by a spring. If a large crawler belt tension was applied when the force was small, there was a risk that the tension roller would automatically retire and come off the track. In addition, if the minimum biasing force in this automatic tensioning system is set strong in advance, the maximum biasing force will become considerably strong, so in the case of rubber crawler belts used in agricultural machinery, the belt tension may be too strong and the belt may be damaged at an early stage. It could have been damaged.

This invention was made with attention to these points, and it is possible to automatically adjust the tension roller in and out as the truck frame moves up and down, and also prevent the tension roller from retiring automatically due to the running load. The purpose of the present invention is to provide a crawler traveling device capable of maintaining an appropriate belt tension state, and in the crawler traveling device having the above configuration, a tension frame on which the tension roller is mounted and a track frame on the side near the tension roller are raised and lowered. converting the swinging motion of the link into a movement of the tension frame in the extending and retracting direction;
Further, the tension frame is interlocked and connected via an interlocking member whose interlocking direction is associated with the tension frame so that as the track frame moves away from the main frame, the tension frame is operated to the side where the amount of protrusion decreases. do.

In other words, the tension frame and the link for raising and lowering the track frame on the side closer to the tension roller convert the swinging motion of the link into a movement in the direction of extension and retraction of the tension frame, and the track frame is connected to the main frame. Since the tension frame is connected via an interlocking member whose interlocking direction is related so that the tension frame is operated to the side where the amount of protrusion decreases as it moves away from the link, the swinging movement of the link and the accompanying track The change in belt tension due to the raising and lowering of the frame has a counterbalancing relationship, and the belt tension is maintained at a predetermined level regardless of the raising and lowering of the track frame.This prevents wheels from coming off due to unexpected retirement of the tension roller. Now I can do it.

Embodiments of the present invention will be described below based on the drawings.

Figure 1 shows the overall side view of the combine, which is equipped with a pair of left and right crawler running devices 1, a threshing device 2,
Main frame 5 equipped with engine 3 and control section 4
A lifting reaping section 7 that can be raised and lowered around a fulcrum P is connected to the front part of the reaping section 7 by a hydraulic cylinder 6.

The crawler traveling device 1 has a rubber crawler belt 11 wound around a drive sprocket 8 at the front end, three rolling wheels 9, and a tension roller 10 at the rear end. A transmission case 12 that pivotally supports a drive sprocket 8 is fixedly connected to the front part of the main frame 5. Further, an axle case 12a protruding from the left and right sides of the transmission case 12 is received and supported by an axle case support frame 14 connected to the lower part of the main frame 5 via a front bracket 13. A truck frame 16 made of square pipe is pivotally connected to this axle case support frame 14 and a rear bracket 15 attached to the rear lower part of the main frame 5 via front and rear links 17 and 18. The frame 16 is equipped with the nine groups of wheels and the tension roller 10.

A hydraulic cylinder 19 is installed across the pivot point between the front link 17 and the axle case support frame 14 and the truck frame 16, and
Another hydraulic cylinder 20 with a slightly longer stroke is installed across the rear link 18 on the side closer to the tension roller 10 and the main frame 5.
The structure is such that the truck frame 16 rises when the hydraulic cylinders 19 and 20 are shortened, and descends when they are extended.

Further, the tension roller 10 is pivotally supported by a tension frame 21 inserted into the rear end of the track frame 16 so as to be freely retractable. A tension operating rod 22 extending forward from the tension frame 21 is The large diameter stepped portion 25 is inserted into the tip end boss 24 of the rod 23 pivotally supported by the rear link 18 and is provided in the middle of the operating rod 22 and the boss 2.
4. The forward movement of the operating rod 22, that is, the withdrawal direction of the tension frame 21 is restricted by contact with the rear end of the tension frame 21.

According to the above configuration, when the hydraulic cylinders 19 and 20 are shortened and the truck frame 16 is raised relative to the main frame 5, the rod 23 moves rearward as the rear link 18 swings clockwise and comes into contact with it. The interlocked tension operating rod 22 is pushed rearward, and the tension frame 21 is protruded and shifted rearward. Also, when the hydraulic cylinders 19 and 20 are extended and the track frame 16 is lowered relative to the main frame 5, the tension frame 2
1 is retracted forward, and in this way, as the track frame 16 moves up and down, the tension roller 10 is automatically moved in and out and fixed, and the crawler belt 11 is maintained in a predetermined tension state.

In the embodiment described above, the operating rod 22 and the rod 23 are collectively referred to as an interlocking member that interlocks and connects the tension frame 21 and the link 18 on the side closer to the tension roller 10.

Incidentally, the initial tension set of the crawler belt 11 and the tension correction for belt elongation are performed by a screw adjustment section 26 between the operating rod 22 and the tension frame 21.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of drawings]

The drawings illustrate an embodiment of the crawler traveling device for a mobile agricultural machine according to the present invention, in which FIG. 1 is an overall side view of a combine harvester, FIG. 2 is a side view of the crawler traveling device, and FIG. 3 is a plan view of the crawler traveling device. It is a diagram. 5... Main frame, 8... Drive sprocket,
9... Rolling wheel, 10... Tension roller, 11...
...Crawler belt, 12...Mission case,
16... Truck frame, 17, 18... Link, 19, 20... Drive device, 22, 23... Interlocking member.

Claims (1)

[Scope of utility model registration request] A drive device 19 connects and fixes a transmission case 12 to the main frame 5, connects a truck frame 16 to the main frame 5 through links 17 and 18 so as to be adjustable up and down, and drives the links 17 and 18 to swing. . Tension roller 10
At the same time as installing this tension roller 10
and a crawler traveling device for a mobile agricultural machine in which a crawler belt 11 is wound and tensioned over a drive sprocket 8 that is pivotally supported on the transmission case 12 and a group of 9 wheels that are pivotally supported on the truck frame 16. , a tension frame 21 on which the tension roller 10 is mounted, and the link 1 for raising and lowering the track frame on the side closer to the tension roller 10.
8, converts the swinging motion of the link 18 into a movement of the tension frame 21 in the extending and retracting direction, and as the track frame 16 moves away from the main frame 5, the tension A crawler traveling device for a mobile agricultural machine, characterized in that the frame 21 is interlocked and connected via interlocking members 22 and 23 whose interlocking directions are related so that the frame 21 is operated in the direction of decreasing the amount of protrusion.