JPS6318552Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pivot seal structure for a crawler traveling device in which a support shaft having a crawler belt guide roller rotatably attached thereto is rotatably attached to a track frame.

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, and the sealing member wore out prematurely due to muddy soil and the like.

The purpose of the present invention is to modify the device so that the seal can be reliably maintained over a long period of time, and the structure can be simple and compact.

The characteristic configuration of the present invention is that, in the above-mentioned pivot seal structure for a crawler traveling device, a seal member consisting of a relatively rotatable outer portion and an inner portion is attached to the support shaft and the truck frame boss portion relative to the support shaft. An elastic annular plate formed in a dish shape by bending the entire circumference near the outer peripheral end surface in the axial direction of the support shaft is interposed between the guide roller and the sealing member, and an elastic annular plate is provided in the support shaft portion between the guide roller and the sealing member. When installed, the outer circumferential end face is held in an elastically deformed state in pressure contact with the end face of the boss portion by the boss portion of the guide roller and the inner portion.

In other words, by providing a sealing member and an annular plate placed outside the sealing member, the covering action of the annular plate makes it difficult for muddy water etc. to enter the area where the sealing member is disposed, and even if it does enter, Due to the shielding effect of the annular plate, the pressure of the muddy water located outside does not act on the muddy water that has entered, making it difficult for the muddy water to enter inside the sealing member. Furthermore, by making the annular plate made of the bent elastic body and assembling it in the elastically deformed state, the annular plate always comes into close contact with the boss regardless of the rotation of the spindle, and furthermore, the outer plate acts as a sealing member. By adopting a structure consisting of an inner part and an inner part, and by sandwiching the annular plate between the inner part and the wheel hub part, the inner part is always in close contact with the annular plate and the annular plate is held in close contact with the annular plate regardless of the spindle rotation. The annular plate always strongly adheres to the wheel, and the annular plate reliably performs both the covering and shielding functions. Therefore, intrusion of muddy water etc. is reliably prevented, and
Abrasion of the sealing member can be effectively prevented, sealing performance can be made extremely excellent, and this high sealing performance can be maintained over a long period of time. Moreover, the annular plate only needs to be assembled in an elastically deformed state, and furthermore, by sandwiching the annular plate between the roller and the seal member, the elastic restoring force of the seal member is effectively utilized for the force of pressing the annular plate against the roller. This resulted in a simple and compact structure as a whole.

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 roller bodies 6, 6 is attached to the truck frame 1 so as to be able to swing up and down by a member 7 which pivotally supports the wheel body 6 on the free end side, and is biased downward by a spring 8. All the wheels 2, 3, 4,
A crawler belt 9 is wound around the belts 5 and 6 to constitute a crawler traveling device that is mainly installed in a combine harvester.

To install the first guide roller 4, as shown in FIG. frame 1
It is rotatably attached via a ball bearing 14 to a cylindrical body 13 having a boss portion formed therein.

Seal members 15 are provided outside the bearings 14 at both ends of the cylindrical body 13.
When the outer part 15a and the inner part 15b are fitted into the cylinder 13 so that they rotate relative to each other, and the inner part 15b is fitted externally to the support shaft 12, the cylinder 13 and the support shaft are connected. A spring steel annular plate 16 is inserted between the seal member 12 and formed into a dish shape by bending the entire circumference near the outer peripheral end face 16a in the axial direction of the support shaft 12, and covers the seal member 15 and The seal member 15, the annular plate 16, and the cylinder are provided between the cylinder 13 and the support shaft 12 in a state located outside the seal member 15 so as to close the space between the cylinder 13 and the support shaft 12. A sealed space 17 formed by each of the parts 13 is filled with grease. Furthermore, the outer circumference side end surface 16a is the cylinder body 13.
in an elastically deformed state in which it comes into pressure contact with the end surface 13a, and
The inner peripheral part of the annular plate 16 is tightened with the boss part 4a by the tightening force of the nut 11 so that the annular plate 16 is in close contact with the boss part 4a of the wheel 4 and rotates integrally with the support shaft 12. 15b, thereby creating a seal between the support shaft 12 and the cylindrical body 13.

FIG. 3 shows another embodiment of the seal structure, in which an annular plate 16 is provided between the annular plate 16 and the wheel boss portion 4a.
A rubber spacer 18 is provided to increase the degree of close contact between the rollers 4 and the rollers 4.

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, in which FIG. 1 is a partially cutaway side view of the crawler traveling device, FIG. 2 is a sectional view of the guide roller mounting part, and FIG. The figure is a sectional view of another implementation seal structure. 1... Truck frame, 4... Guide wheel, 4
a... Rolling wheel boss portion, 12... Support shaft, 13... Truck frame boss portion, 13a... Boss portion end surface, 1
5... Seal member, 15a... Outer part, 1
5b... Inner part, 16... Annular plate, 16a
...End face on the outer circumferential side.

Claims (1)

[Scope of utility model registration request] This is a pivot seal structure of a crawler traveling device in which a support shaft 12 to which a crawler belt guide roller 4 is integrally and rotatably attached is rotatably attached to a track frame 1, and an outer portion 15a that is relatively rotatable.
and an inner portion 15b.
is interposed between the support shaft 12 and the truck frame boss portion 13 for this support shaft 12, and the entire circumference near the outer peripheral end surface 16a is bent in the axial direction of the support shaft 12 to form a dish-shaped elastic member. The annular plate 16 is connected to the support shaft 12 between the guide roller 4 and the seal member 15.
At the same time, the outer peripheral side end surface 16a
The elastic annular plate 16 is compressed by the boss portion 4a of the guide roller 4 and the inner portion 15b in an elastically deformed state in which it is pressed against the end surface 13a of the boss portion 13.
A pivot seal structure of a crawler traveling device that is clamped.