JPS6117907Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a track pin seal device that is installed in a track link connection portion of a tracked vehicle such as a bulltozer or a power shovel. Tracked vehicles are generally used for civil engineering work, etc., and require techniques for sealing mud, and reliable sealing is also required for track link connections.

Conventionally, a crawler pin seal device as shown in FIG. 1 has been known. That is, 1 is an outer link, and a pin 3 is press-fitted into a pin hole 2 of the outer link 1. Further, a recess 4 concentric with the pin hole 2 is formed on the inner surface of the outer link 1.

Reference numeral 19 denotes a bushing hole bored in the inner link 6. The bushing 7 inserted onto the pin 3 is press-fitted into the bushing hole 19, and a part of the end of the bushing 7 protruding from the bushing hole 19 is A spacer 8 fitted onto the pin 3 so as to be inserted into the recess 4 of the outer link 1 is connected to the recess 4 and the bush end face 7a.
interposed between. As described above, an annular cavity 9 is constituted by the recess 4, the bushing end face 7a, and the spacer 8, and the dust seal 10 and the load ring 11 are press-fitted into the cavity 9. The dust seal 10 is made of a highly abrasion-resistant and elastic material such as polyurethane rubber and has a suitable hardness, and has a substantially W-shaped cross section that opens outward in the radial direction. . Further, the load ring 11 is made of an elastic material softer than the dust seal 10, such as nitrile rubber or acrylic rubber,
It is elastically interposed between both ends 12 and 13 of the dust seal 10.

The crawler pin seal device having the above configuration had the following problems. The load ring 11 and the dust seal 10 swing together with the outer link 1 due to the interference between the outer peripheral surface of the load ring 11 and the recess 4 and the interference between one end 12 of the dust seal 10 and the recess 4. , a sealing sliding movement is achieved between the other end 13 of the dust seal 10 and the end surface of the bush 7, but the interference between the load ring 11 and the dust sheet 10 is made of a rubber-like elastic material such as nitrile rubber or polyurethane rubber. Therefore, since it decreases over time, there has been a problem of sliding between the load ring 11 and the dust seal 10 and the recess 4.

This tendency is particularly noticeable when the oil sealed in the bush 7 is interposed between the outer peripheral surface of the load ring 11 and the recess 4 and between one end 12 of the dust seal 10 and the recess 4. It was hot.

In this way, the load ring 11 and the dust seal 1
If sliding occurs between 0 and recess 4, good sealing performance cannot be expected between them because sliding is not expected to occur between them, and oil may leak to the outside. Leakage and load ring 1
There was a risk that the dust seal 1 and the dust seal 10 would be prematurely worn and damaged.

The present invention has been made to solve the problems of the prior art described above, and includes a metal ring having an approximately L-shaped cross section that is fitted and fixed into the recess of the outer link, and a metal ring that is penetrated between the metal ring and the dust seal. holes, protrusions,
By providing means for preventing relative rotation such as a corrugated portion or an adhesive, it is intended to effectively prevent sliding between the load ring and the dust seal and the recess.

The seal according to the present invention will be explained in detail based on FIGS. 2 to 6. It should be noted that the seal shown in each figure is installed in the empty chamber 9 in the same way as the conventional seal shown in FIG. In the embodiment shown in FIGS. 2 and 3, a plurality of through holes are provided in the radial component of the metal ring 5, which has a substantially L-shaped cross section and is fitted and fixed in the recess 4 provided in the outer link 1. 26 are provided.
In order to correspond to this through hole 26, the dust seal 1 is
A plurality of protrusions 27 are formed on one end 13 of the 0, and these protrusions 27 are engaged with the through holes 26.

Next, another embodiment will be described based on FIGS. 4 and 5. The axial component of the metal ring 5 having a substantially L-shaped cross section is fitted and fixed in the recess 4 provided in the outer link 1. A wave-shaped portion 28 is provided.

The inner circumferential surface of this wave-shaped portion 28 and the outer circumferential surface of the load ring 11 are engaged with each other.

Further, to explain still another embodiment shown in FIG. axial component is short) is dust seal 10
It is integrally bonded to one end 12 of.

The present invention described above has the following effects.

(a) Since the dust seal and the metal ring are integrated through a means for preventing relative rotation, by fitting the metal ring into the recess, the dust seal slides relative to the side surface of the recess when the inner and outer links rotate relative to each other. There is no. As a result, the fixed side of the dust seal will not be worn, and lubricating oil will not flow out from this fixed side.

(b) The seal lip that makes sealing contact with the bush end face of the dust seal is held by a metal ring fixed in the recess, and can always be in close contact with the bush end face in a normal position even if the inner and outer links swing violently.

As a result, the seal lip is free from abnormal wear and can prevent dust from entering from the outside and lubricating oil inside from flowing out to the outside over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional crawler pin seal device, and FIGS. 2 to 6 are views showing seals used in the crawler pin seal device according to the present invention. 1... Outer link, 2... Pin hole, 3... Pin, 4... Recess, 5... Metal ring, 6... Inner link, 7... Bush, 7a... Bush end face, 8
... Spacer, 9 ... Vacancy, 10 ... Dust seal, 11 ... Load ring, 12 ... End, 13
... end, 19 ... bushing hole, 25 ... relative rotation prevention means, 26 ... through hole, 27 ... protrusion, 2
8...Wave shaped part.

Claims (1)

[Claims for Utility Model Registration] 1. Consists of a pin 3 connecting the outer link 1 and the inner link 6, an end face of a bushing 7 fitted onto the pin 3, and a recess 4 provided in the outer link 1. The ends 12 and 13 of the dust seal 10, which has a substantially W-shaped cross section, are installed in the annular cavity 9 so as to be in close contact with the bush end face and the recess, respectively, and the dust seal 10 has a substantially W-shaped cross section between the two ends on the outer circumferential side. In the crawler pin seal device which is provided with a load ring 11 which is elastically interposed in A crawler belt pin seal characterized in that a relative rotation prevention means 25 is provided on the dust seal 10. 2. The relative rotation prevention means 25 engages the plurality of through holes 26 provided in the radial direction component of the metal ring 5 and the plurality of protrusions 27 provided on one end 12 of the dust seal 10 corresponding to the through holes 26. The crawler belt pin seal device according to claim 1, which is in a combined mode. 3. Claim 1, in which the relative rotation prevention means 25 is in a mode in which a wave-shaped portion 28 provided on the axial component of the metal ring 5 and the outer circumferential portion of the load ring 11 are engaged with each other.
Crawler pin seal device as described in section. 4. The crawler belt pin seal device according to claim 1, wherein the relative rotation prevention means 25 has a configuration in which the metal ring 5 and one end 12 of the dust seal 10 are bonded together.