JPS6335035Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a crawler-type traveling system in which a plurality of wheels for guiding the ground-contacting side of the traveling crawler are arranged in parallel in the front-rear direction between the drive wheel and the tension wheel for the traveling crawler. Regarding equipment.

Such traveling devices are mainly used on mobile agricultural machinery such as combines, but if all the wheels are fixed, the bottom of the crawler cannot follow the convexities on the ground, causing vibrations in the machine body. Because it is intense,
Generally, all of the wheels are configured to be able to move up and down so that the bottom surface of the crawler can follow convexities on the ground.

However, if all of the wheels are configured to be able to move up and down, the wheels will not be able to be pressed firmly on soft ground, making it difficult to run properly.
As shown in Japanese Patent No. 53843, all of the wheels are small and can be raised and lowered. In other words, in this structure, wheels are attached to each free end side of a second arm device pivotably pivoted on a seesaw with respect to a first arm device pivotally supported on a truck frame. Everything is small and can be raised and lowered.

With this type of structure, the bottom surface of the crawler can follow small convexities on the ground well by seesawing each roller, but the rollers tend to miss a lot when going over a ridge. As a result, the angle of inclination of the bottom of the crawler to the ground becomes large, making it impossible to cushion the impact of the aircraft.

The object of the present invention is to enable a wheel to follow even small irregularities well, to go over ridges well, and to prevent wheel derailment well.

The characteristic structure of this invention to achieve the above purpose is as follows:
Among the wheels, the front and rear wheels are fixed to the crawler frame, and the middle roller is positioned higher than the axis of the fixed front and rear wheels. The swing arm is attached to the free end side of the swing arm that is swingably supported on the frame portion so as to be able to move up and down with respect to the crawler frame, and further includes a bomb that biases the swing arm in the downward direction. and the elevating roller is of an inner roller type whose outer peripheral portion fits between a pair of roller locking protrusions protruding from the inner surface of the crawler at a predetermined distance from the left and right, and
The front and rear fixed wheels other than the elevating wheels are constructed in the form of outer wheels, with the outer peripheries of the pair of left and right wheels located on the lateral outer sides of the front, rear, left and right locking protrusions, respectively, and the following effects can be obtained from such a construction. be effective.

In other words, since it is a combination of fixed rollers and elevating rollers, the fixed rollers can run smoothly on soft ground, and the elevating rollers can escape from small bumps in the field. Furthermore, when crossing a ridge, the elevating and lowering wheels escape greatly, reducing the angle of inclination of the bottom of the crawler to the ground, thereby reducing the impact on the aircraft. Since the wheels other than the elevating wheels are configured as external wheels having a pair of left and right outer circumferential portions that contact the crawler's ground contact side, there are many locations that receive the crawler's ground contact side. The ground-contacting side part of the crawler can be supported with good stability, and since the elevating wheel is configured as an inner rolling wheel whose outer periphery fits between the locking protrusions, it is possible to support the crawler's ground-contacting side part in the longitudinal direction intermediate part. Even if the crawler tilts from side to side around the outer periphery of the inner roller as a fulcrum, it remains stuck between the locking protrusions on the outer periphery of the inner roller, allowing the ground-contacting side of the crawler to come off the roller. This can definitely be avoided.

More specifically, if all the rollers are of the outer roller type, for example, as the part of the crawler contact side that corresponds to the elevating wheel rides on the convex part and tilts from side to side, the crawler contact side part will move up and down. There is an inconvenience that the crawler easily comes off from the ring, and if all the rollers are of the inner roller type, the number of places where the rollers catch the crawler is reduced, making it impossible to support the crawler with good stability. However, according to the present invention, the crawler portion, which tends to tilt from side to side when entering a recess or riding on a convex portion, that is, the crawler portion corresponding to the elevating roller, is prevented from coming off from the roller. In order to achieve this, by making the elevating rollers an internal roller type, and by making the rollers that support the other crawler parts an outer roller type, the ground-contacting side of the crawler as a whole can be supported with good stability. Also, the crawler was prevented from coming off the wheels, and a crawler-type traveling device with great practical advantages was obtained.

Next, embodiments of the present invention will be described based on the drawings.

As shown in FIG. 1, a threshing section 2 is mounted on a pair of left and right crawler-type traveling devices 1, and a reaping processing section 3 is installed to reap grain culms of rice, wheat, etc. and supply them to the threshing section 2. The crawler type traveling device 1 is provided at the front of the machine body to constitute a combine harvester, and the crawler type traveling device 1 will be described in detail below.

As shown in FIGS. 2 to 5, core metals 5 are buried in the running crawler 4 made of rubber or the like at appropriate intervals in the circumferential direction, and a driving force is provided between the core metals 5 of the crawler 4. Sprocket (drive wheel) 6
An engagement hole 7 is formed therein. And crawler 4
Nine rolling wheels 8 and 9 are arranged in parallel in the front-rear direction for guiding the ground-contacting side portion of the crawler 4, and a tension rolling wheel (tension wheel) 1 for guiding the rear end of the crawler 4.
0 and a roller 11 for guiding the upper portion of the crawler 4, and a pair of roller locking protrusions 12, 12 positioned on the inner surface of the crawler 4 at a predetermined distance from each other on the left and right sides. 5 and protrudes at appropriate intervals in the circumferential direction of the crawler so as to drive and rotate the traveling crawler 4.

The support structure for the wheels 8 and 9 on the ground-contact side portion of the crawler will be explained by three frame portions 13A, 13B, 1 having an inverted U-shape when viewed from the front and back.
3C are arranged in the front-rear direction, and the central frame portion 13B is placed on top of the front and rear frame portions 13A and 13C by welding to form a crawler frame. be. A spindle support case 8 for the front three wheels and the rear four wheels among the nine wheels 8 and 9.
A is welded to the crawler frame, and
Spindle support case 9A for the two remaining wheels 9
is attached to a pair of swinging arms 15 that are supported on the crawler frame so as to be able to swing up and down about a horizontal axis 14, and then pressed into the inside of a cylindrical body 16 formed of an elastic material such as rubber. coil spring 17
A biasing device embedded therein is provided to bias the rod 18 pivotally connected to the arm 15 so as to bias the swinging arm 15 in the downward direction. A state in which only the two wheels 9, 9 located at the middle part in the longitudinal direction of the nine wheels 8, 9 are movable up and down and biased downward so that the entire side portion can be grounded. It is installed with.

Further, the elevating wheels 9, 9 are of an inner rolling type whose outer circumferential portions fit between the pair of roller locking protrusions 12, 12, and the elevating wheels 8 other than the elevating wheels are formed into a pair of left and right outer peripheries. The portions are arranged in an outer wheel type, with the portions located on the lateral outer sides of the left and right locking protrusions 12, 12, respectively. It is designed to prevent it from coming off.

The support frame 6A of the drive sprocket 6 is welded to the crawler frame, and the support frame 10A of the tension roller 10 is slid in and out between the crawler frame and the inverted U-shaped member 22 welded thereto. The pressure spring 19 for biasing the rolling wheels is provided in a state in which it acts on a threaded rod 20 attached to the support frame 10A so as to be freely adjustable in its extension and retraction. A retraction adjustment nut 21 is fitted onto the threaded rod 20.

To carry out the present invention, various changes may be made to the mounting structure of the elevating wheels 9, such as mounting a pair of elevating wheels 9, 9 closer to each other as they rise, as shown in FIG. The number of wheels 9 to be raised and lowered can also be changed in various ways.

In addition, in order to absorb the tension and relaxation of the traveling crawler 4 as the rollers 9 move up and down, the tension wheels 1
Although it is better to provide a spring 19 that biases the tension side 0 toward the tension side, if the traveling crawler 4 is made of an elastic material such as rubber, it is not necessarily necessary to provide the tension spring 19.

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 the drawing]

The drawings show an embodiment of the crawler type traveling device according to the present invention, FIG. 1 is a schematic side view of a combine harvester, FIG. 2 is a partially cutaway side view of the crawler type traveling device, and FIG. 3 is a cross-sectional view of the crawler type traveling device. 4 is a view taken along the - line in FIG. 2, FIG. 5 is a cutaway side view of the biasing tool, and FIG. 6 is a side view of another embodiment. 4... Traveling crawler, 6... Drive wheel, 8... Rolling wheel, 9... Lifting rolling wheel, 10... Tension wheel, 1
2...Rotary wheel locking protrusion.

Claims (1)

[Scope of utility model registration request] A crawler-type traveling device in which a plurality of wheels 8 and 9 for guiding the ground-contacting side portion of the traveling crawler 4 are arranged in parallel in the front-rear direction between a drive wheel 6 and a tension wheel 10 for the traveling crawler 4. Among the wheels 8, 9, the front and rear wheels 8, 8 are fixedly provided to the crawler frame, and the intermediate wheel 9 is fixed to the front and rear wheels 8. ，
The swing arms 15, 15 are mounted on the free end sides of swing arms 15, 15 which are swingably supported on the crawler frame portion at a position higher than the axis of the slider 8, and are configured to be able to move up and down with respect to the crawler frame. Swing arm 1
A pair of roller locking protrusions 12 are provided, and the outer circumferential portion of the elevating roller 9 protrudes from the inner surface of the crawler at a predetermined distance from the left and right. .
A crawler-type traveling device configured in the form of outer wheels located on the lateral outer side of each of No. 2 and No. 2 and No. 12.