JPS6318551Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention fixes the support bracket of the crawler belt guide roller to a support shaft that is rotatably supported on the boss portion of the track frame, so that the support bracket is configured to be swingable. The present invention relates to a pivot seal structure for a crawler traveling device.

In the above-mentioned crawler traveling device, an O-ring or a dust seal has conventionally been inserted between the support shaft and the boss of the track frame to seal the space between the support shaft and the track frame boss for the support shaft. A sufficient sealing effect could not be obtained.

The purpose of the present invention is to provide a highly reliable seal with a simple structure.

The characteristic configuration of the present invention is that in the above-mentioned pivot seal structure of the crawler traveling device, an elastic annular plate formed in a dish shape by bending the entire circumference near the outer peripheral end face in the axial direction of the support shaft is attached to the boss portion. The outer circumferential side end surface is pressed against the end surface of the truck frame boss by being clamped by a stepped portion formed on the support shaft portion at a portion exposed outwardly than the end surface of the support bracket and the support bracket facing the stepped portion. It is attached to the support shaft between the boss portion and the support bracket so as to be able to rotate therewith in close contact with the support shaft in an elastically deformed state.

In other words, since the gap between the support shaft and the truck frame boss is closed by the annular plate, the annular plate is made of an elastic material having the above-mentioned bent shape, and only the outer peripheral end face is pressed against the boss end face. By assembling it in a deformed state, the annular plate will always strongly adhere to the boss regardless of the rotation of the spindle, making it possible to reliably prevent muddy water from entering between the spindle and the boss. The wheels were able to move up and down smoothly even in wetlands. In addition, the structure is simple and requires only assembling the annular plate in an elastically deformed state, which is economically advantageous.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a crawler belt driving wheel 2 is provided at one end of the truck frame 1, and a crawler belt tensioning wheel 3 is provided at the other end, and these wheels are arranged between the two wheels 2 and 3. A plurality of crawler belt lower side first guide rollers 4... and one crawler belt upper side guide roller 5 are respectively attached to the truck frame 1 so as to be freely rotatable, Each of the two guide wheels 6, 6 is attached to the truck frame 1 so as to be able to swing up and down by a support bracket 7 that pivotally supports the wheel 6 on the free end side, and is biased downward by a spring 8a in the case 8. A crawler belt 9 is wound around all the wheels 2, 3, 4, 5, and 6 to form a crawler traveling device that is mainly installed in a combine harvester.

In order to enable the support bracket 7 to swing relative to the truck frame, a support shaft 10, on which the support bracket 7 is tightened and fixed at both ends so as to rotate integrally with the support bracket 7, is attached to a boss portion of the truck frame 1, as shown in FIG. It is rotatably attached via a bush 12 to a cylindrical body 11 formed with a.

At both ends of the cylinder 11, a spring steel annular plate 13 is formed into a dish shape by bending the entire circumference near the outer peripheral end surface 13a in the axial direction of the support shaft 10.
is provided between the support bracket 7 and the cylinder 11 in a state surrounded by an annular projection 14 provided on the end surface 11a of the cylinder 11, and the outer peripheral side end surface 13a is pressed against the cylinder end surface 11a. The inner circumference of the annular plate 13 is supported by a support bracket 7 so that the annular plate 13 is in an elastically deformed state and in close contact with the support shaft 10 and rotates integrally with the support shaft 10.
The annular plate 13, the cylindrical body 11, and the support shaft 10 are pressed against the support shaft 10 by the tightening force applied to the support shaft 10.
A sealed space 15 formed by the bushings 12 and 12 is filled with grease to seal between the support shaft 10 and the cylinder 11.

To install the first guide roller 4, as shown in FIG. 3, the keys 16 are engaged with the tapered portions of the guide rollers 4 at both ends so that they rotate integrally, and
A support shaft 18 fixed with a screw 17 is rotatably attached to a cylindrical body 19 having a boss portion formed in the truck frame 1 via a bearing 20.

Then, on both end sides of the cylinder 19, a seal member 21 is interposed between the cylinder 19 and the support shaft 18 while being positioned outside the bearing 20, and further,
A spring steel annular plate 22 formed in a dish shape by bending the entire circumference near the outer peripheral end surface 22a in the axial direction of the support shaft 18 is provided between the cylinder body 19 and the guide roller 4, and the outer peripheral side The end surface 22a is the end surface 19 of the cylindrical body 19.
in an elastically deformed state in pressure contact with a, and the guide wheel 4
The inner circumferential portion of the annular plate 22 is fitted with a collar 23 and a rubber ring 24 in an elastically deformed state so that the annular plate 22 is in close contact with the boss portion 4a and rotates integrally with the guide ring 4. Further, the sealed space 25 formed by the cylinder 19, the annular plate 22, the collar 23, and the sealing member 21 is filled with grease to seal between the support shaft 18 and the cylinder 19.

In carrying out the present invention, if the annular protrusion 14 is provided as shown in the above embodiment, the entry route for muddy water etc. to the contact point between the outer peripheral end surface 13a and the cylinder body 11 will be limited to the protrusion 14 and the annular protrusion 14. Since each of the plate 13 and the support bracket 7 is formed into a narrow bent shape, the sealing performance is further improved, which is advantageous, but the annular projection 14 may be omitted.

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 pivot seal structure of the crawler traveling device according to the present invention, FIG. 1 is a partially cutaway side sectional view of the crawler traveling device, FIG. 2 is a sectional view of the mounting portion of the wheel support bracket, FIG. 3 is a sectional view of the first guide roller mounting portion. 1... Truck frame, 6... Guide wheel, 7
... Support bracket, 10 ... Support shaft, 11 ... Track frame boss portion, 11a ... Boss portion end surface,
13... Annular plate, 13a... Annular plate end surface, 14...
...annular process.

Claims (1)

[Claims for Utility Model Registration] 1. The support bracket 7 of the crawler belt guide roller 6 is fixed to a support shaft 10 rotatably supported by the boss portion 11 of the truck frame 1, and the support bracket 7 is rocked. The pivot seal structure of the crawler traveling device is configured to be movable, and the elastic annular plate 13 is formed into a dish shape by bending the entire circumference near the outer peripheral end surface 13a in the axial direction of the support shaft 10.
The outer peripheral end surface 13a is clamped by a stepped portion formed on the support shaft 10 at a portion exposed outwardly than the end surface 11a of the boss portion 11 and the support bracket 7 facing the stepped portion, so that the outer peripheral end surface 13a is attached to the track. The boss portion 11 and the support bracket 7 are in an elastically deformed state in which the frame boss portion 11 is pressed against the end surface 11a of the frame boss portion 11.
A pivot seal structure for a crawler traveling device, which is rotatably attached to the support shaft 10 in close contact with the support shaft 10 between the two. 2. The truck frame boss portion 11 connects the annular protrusion 14 surrounding the annular plate 13 to the end surface 11.
A pivot seal structure for a crawler traveling device as set forth in claim 1 of the utility model registration claimed in (a).