JPS6218548Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a bearing structure for a crawler device mainly used as a traveling device for combine harvesters, harvesters, etc. Specifically, one end is attached to a transmission case, and the near other end is attached to a truck frame. A bearing case capable of fitting and holding a bearing for the transmission shaft is provided at the end of the truck frame side of the cylindrical case in which the transmission shaft for the drive wheel body for the crawler belt is fixedly supported. This invention relates to a bearing structure in a crawler device that is externally fitted and fixed.

In the conventional bearing structure of this type of crawler device, as shown in FIG. The diameter of the cylindrical case is the same over the entire length, but in this case, the ground clearance of the lower surface of the cylindrical case between the transmission case and the truck frame is generally made as high as possible to facilitate driving in wet fields. In order to suppress the increase in running resistance due to the contact of the cylindrical case portion with the ground, it is necessary to configure the cylindrical case as small in diameter as possible, so sufficient bearing strength must be ensured. When installing a large diameter bearing on the
There is a large difference between the diameter of the inner circumferential surface of the bearing case for fitting externally to the end of the cylindrical case and the diameter of the inner circumferential surface for fitting inside the bearing. A thick-walled pipe with an inner diameter equal to or almost equal to A serious problem arose.

The present invention satisfies the functions required of the cylindrical case in order to improve the wet field running performance by structurally modifying the cylindrical case.
The purpose is to solve the manufacturing and processing problems that the conventional structure had.

In the bearing structure of the crawler device according to the present invention, in the above-mentioned structure, of the cylindrical case,
The outer diameter of the case portion on the other end that is fixedly supported by the truck frame is approximately equal to the inner diameter of the bearing case that is externally fitted and fixed on the end of the case portion on the other end, and It is characterized in that the cylindrical case portion closer to the transmission case than the case portion on the other end has a smaller diameter than the case portion on the other end.

In other words, instead of constructing the cylindrical case to have the same diameter over its entire length, the cylindrical case part on one end side, which is fixedly supported by the truck frame, has a larger diameter than the cylindrical case part on the transmission case side. Therefore, even if a large-diameter bearing is installed, the cylindrical case portion extending between the transmission case and the truck frame should be constructed with a small diameter as much as possible. While suppressing the contact of the shaped case part with the ground when driving in wet fields, the material for the bearing case that is externally fitted and fixed to one end of the cylindrical case is designed to reduce the amount of inner circumferential surface shaving required to fit the large-diameter bearing tool inside. It is possible to use a pipe that requires less or does not require cutting, which makes the manufacturing process more advantageous. Furthermore, since the portion of the cylindrical case that is fixedly supported by the truck frame also has a large diameter, the connection strength between the cylindrical case and the truck frame can also be increased.

Hereinafter, an embodiment of the present invention will be described based on the drawings.A pair of left and right track frames 4, each equipped with a group of wheels 3, 3... on which left and right crawler belts 2, 2 are respectively stretched, are mounted on the body frame 1. 4 are fixedly connected to each other, and a transmission shaft 7 is connected from a transmission case 5 supported at a position corresponding to the left and right track frames 4, 4 of the body frame 1 to the drive wheel bodies 6, 6 for the crawler belts 2, 2. The cylindrical cases 8, 8 in which the cylindrical parts 7 are housed are arranged such that one end thereof is on the side surface of the transmission case 5, and the other end near the track frame 4, 4 is attached to the side surface of the transmission case 5.
The transmission case has a diameter larger than the diameter of the transmission case 5 side end of the cylindrical cases 8, 8, and is fixedly supported by the cylindrical cases 8, 8 on the track frame 4, 4 side end. Bearing fittings 9, 9 for shafts 7, 7
In a bearing structure for a crawler device in which bearing cases 10, 10, which can be fitted and held, are fitted and fixed on the outside, the cylindrical cases 8, 8 are fixedly supported by the track frames 4, 4, respectively. The structure is such that the portions 8A, 8A have a larger diameter than the cylindrical case portions 8B, 8B on the side of the transmission case 5, and have an outer peripheral surface diameter approximately equal to the outer peripheral surface diameter of the bearings 9, 9. It is constructed by having one pipe member in the state where it is held.

In the figure, 11 and 11 are sealing materials.

As shown in FIG. 4, the cylindrical case 8 may be constructed by firmly connecting two case parts 8A and 8B made of pipe members having different diameters.

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 illustrate an embodiment of the bearing structure in the crawler device according to the present invention, FIG. 1 is a side view of the crawler device, FIG. 2 is an enlarged longitudinal sectional front view of the crawler device, and FIG. 3 is an enlarged longitudinal sectional front view of the main parts. 4 are enlarged longitudinal sectional front views of main parts showing another embodiment, and FIG. 5 is an enlarged longitudinal sectional front view of main parts showing a conventional structure. 5...Transmission case, 4...Truck frame,
2... Crawler belt, 6... Drive wheel body, 7...
Transmission shaft, 8... Cylindrical case, 9... Bearing tool, 1
0...Bearing case.

Claims (1)

[Claims for Utility Model Registration] 1. One end is firmly supported by the transmission case 5 and the vicinity of the other end is fixedly supported by the truck frame 4, and the transmission shaft 7 is connected to the drive wheel body 6 for the crawler belt 2. In the bearing structure for a crawler device, a bearing case 10 capable of fitting and holding a bearing member 9 for the transmission shaft 7 is externally fitted and fixed to the end of the inner cylindrical case 8 on the track frame 4 side. The outer diameter of the other end case portion 8A of the cylindrical case 8 that is fixedly supported by the track frame 4 is the inner diameter of the bearing case 10 that is externally fitted and fixed to the end of the other end case portion 8A. The other end side case portion 8 of the cylindrical case 8 is approximately equal to the
Cylindrical case portion 8B closer to the transmission case 5 than A
A bearing structure for a crawler traveling device, characterized in that the diameter of the case portion 8A is smaller than that of the other end side case portion 8A. 2. The bearing structure for a crawler device according to claim 1, wherein the cylindrical case 8 is composed of a single pipe member.