JPH062057Y2 - Chain seal device - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial field of application The present invention relates to a seal device for a chain such as a roller chain. More specifically, the present invention relates to a seal ring for sealing a lubricating oil filled in a gap between a pin and a bush. The present invention relates to a sealing device which is sandwiched between a pin link plate and a roller link plate so as to surround a bush end projecting from a link plate.

(B) Conventional technology Conventionally, as shown in FIG. 3, the seal chain 1 has two similar pin links 5 in which two steel eyebrow type pin link plates 2 are joined by pins 3. The roller link plate 6 is connected by a bush 7, and the roller link 10 in which the roller 9 is rotatably fitted to the roller link plate 6 is surrounded by the pin link plate 2 so as to surround the end of the bush 7 protruding from the roller link plate 6. A seal ring 11 having an X-shaped cross section is interposed between the roller link plate 6 and the roller link plate 6 and alternately connected to form a series of endless shapes. As a result, the lubricating oil sealed in the bearing portion of the chain 1 including the pin 3 and the bush 7 is sealed to prevent dust and the like from entering the bearing portion and the lubricating oil from scattering from the bearing portion. ing.

However, the X-shaped ring 11 of the above-mentioned conventional seal chain 1
In some cases, the lip portion 11a was bitten in the gap 12 between the pin link plate 2 and the bush 7 and was damaged.

Therefore, as shown in FIG. 4, the first and second lips 13 and 15 and the outwardly-inclined datums are sequentially formed on the two sides of the rectangular section facing the axial direction from the inner side to the outer side. The strip 16 is provided, and mountain-shaped projections 17 and 19 are provided at the center of the two sides facing each other in the radial direction, and the projection 17 is provided from the inner end 13a of the first lip 13. It is configured so as to project inward, the inward protrusion 17 is brought into contact with the bush 7, the end 13a of the first lip 13 is kept away from the gap 12, and the lip 13 is bitten into the gap 12. Seal ring 20 capable of preventing a problem of being damaged by being trapped
Has been devised (see Japanese Utility Model Publication No. 57-57245).

Further, as shown in FIG.
A plurality of tops 21, 21 ', 22, 22' are formed on one side, the outer tops 22, 22 'are formed in a lip shape, and the inner tops 21, 21' are formed in a gob shape. The intervals 21-21 'and 22-22' of the tops, that is, the thicknesses a and b are a <b
And the inner diameter D ₁ is smaller than the outer diameter of the bush 7 so that
The pressure is applied substantially evenly to 1 ', 22 and 22' to maintain a good sealing effect, and the pressure received by each top part is reduced to improve the bending performance of the chain and to inwardly. The present applicant has devised a seal ring 25 in which the formed top portion 23 is brought into contact with the side wall of the bush 7 to prevent biting into the gap 12 (see Japanese Utility Model Publication No. 55-39164).

(C) Problems to be solved by the invention However, the seal ring 2 having a large number of lips as described above
0 can prevent the lip 13 from being caught in the gap 12 between the pin link plate 2 and the bush 7 due to the contact of the protrusion 17 with the side wall of the bush 7, but the lip 13, 15, 16 Roller link plate 6
In addition, the contact area with the pin link plate 2 is increased as compared with the X-shaped seal ring 11 described above, and particularly, the second lip 15 at the center has a shape that is difficult to bend, so that the bending performance of the chain deteriorates. Furthermore, when assembling the chain, the first lip 13 and the protrusion 17 are attached to the seal ring 20.
Of the seal ring 20 is hindered from riding on the smooth end of the bush, and incomplete mounting of the seal ring 20, such as twisting, may occur.

Further, the seal ring 25 devised by the applicant of the present invention described above, when mounted on the chain 1, has the outer top portions 22, 2
Since the 2'and the inner tops 21,21 'are crushed and deformed, the deformation of the inner tops 21,21' is caused by the seal ring 25.
The ring 25 is swelled inward in the radial direction, but the top portion 23 is in contact with the bush 7, and
Since the lips 22, 22 'elastically contact the pink link plate 2 and the roller link plate 6 obliquely to produce a wedge effect, the deformation of the members is less likely to occur in the outward direction. The elastic force of the part toward the outside increases, which increases the frictional force and makes it difficult for the chain to bend, which may reduce the transmission efficiency. Further, when there is a deformation in the direction of the outer tops 22 and 22 ', as shown by the dashed line in FIG. 5, the tops 22 and 22' are flipped up and deformed by the force to move outward. However, there is a risk that the damage will be accelerated.

(D) Means for Solving the Problems The present invention is intended to solve the above-mentioned problems, and for example, as shown in FIG.
6 has an arcuate surface A formed on the inner side thereof that abuts the bush 7, and notches 33, 33 'are formed on both sides of the arcuate surface A leaving the central portion 27 of the arcuate surface A on the inner side. The end surface is formed with three apexes which are arcuate surfaces, the outer diameter ends 30, 30 'of the seal ring 26 are formed in a lip shape, and the outer diameter ends 30, 30' extend from the arcuate surface A Arc-shaped recesses 32, 32 'are formed on both side portions, and the width of the inner portion of the seal ring, which is formed by the top portions of both sides, is a predetermined amount than the width of the outer portion formed by the both lip-shaped outer diameter ends. It is characterized in that it is made large.

(E) Action When the seal ring 26 is mounted on the chain 1 based on the above-mentioned configuration, the seal ring 26 fitted on the bush 7
The inner top 27 formed on the inner side of the bush 7
Abut the side wall. Further, the seal ring 26 crushed from both sides by the pin link plate 2 and the roller link plate 6 bends the inward projections 29, 29 ′ toward the inward projection 27. At this time, since the deformation of these inner tops 29, 29 'is absorbed by the notches 33, 33',
The seal ring body does not deform, and the lip-shaped outer top portions 30, 30 'are also bent toward the recess 31 by the link plates 2, 6, so that the seal ring 26 has its top portion. 29, 29 ', 30, 3
0'is in close contact with the link plates 2 and 6, and in this state, the lubricating oil filled between the bush 7 and the pin 3 and between the recesses 32, 32 'and the pin link plate 2 and the roller link plate 6 The intervening lubricating oil is sealed.

(F) Embodiment An embodiment according to the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the seal ring 26 has an arcuate surface A having a predetermined radius in an inner part that comes into contact with the bush 7 when mounted on the seal chain 1, and the arcuate surface A has a central part and Small U-shape (or V-shape) between both sides
Notch portions 33, 33 'are formed. As a result, the central portion becomes the inward projection 27, and the cutout portion 3
On both sides of the inward projection 27 which separates 3, 33 ', the inward top 2
9 and 29 ′ are formed, and the inner protrusion 27 has an inner top 2
It is configured to project inward by a predetermined amount from 9, 29 '. An arcuate recess 31 having a predetermined radius is formed on the outer diameter portion, and arcuate recesses having a predetermined radius are formed on the side surfaces extending from the inner tops 29 and 29 'to both ends of the outer diameter portion. Three
2, 32 'are formed so that both ends of the outer diameter portion are lip-shaped outer top portions 30, 30'. Further, between the inner tops 29-29 'and the outer top 30-.
The gaps between 30 ', that is, the thicknesses a and b, are configured so that the relationship of a> b, in which the thickness on the inner side is slightly larger, is established.

Since the present embodiment is configured as described above, the inner protrusion 27 contacts the side wall of the bush 7 and the inner top 2
9 and 29 'are sandwiched and crushed by the pin link plate 2 and the roller link plate 6, respectively. Then, the crushing force causes the inner tops 29 and 29 'to bend toward the inner protrusions 27, respectively, but since the deformation of the members due to the bending is absorbed by the notches 33, 33', the seal ring The deformation of 26 does not extend in its radial direction. At this time, the notch amount of the notch portions 33, 33 ′ is appropriately determined according to the amount of crushing received from the seal chain 1 into which the seal ring 26 is fitted. On the other hand, the outer tops 30 and 30 'are also crushed similarly to the inner tops 29 and 29', but are slightly elastically bent and deformed by the arcuate recess 31.

Therefore, when the seal ring 26 is attached to the rail chain 1, the inner top portions 29, 29 'and the outer top portions 30, 3 are attached to the pin link plate 2 and the roller link plate 6, respectively.
0'respective outer end portions 29a, 29'a, 30a, 3
0'a becomes lightly in point contact, and the inner protrusion 27
Also contacts the side wall of the bush 7 in the state of point contact, the seal ring 26 lightly co-rotates even when the chain 1 is rotated / moved, so that the contact resistance is reduced and the seal chain 1 has a flexible property. Will not be disturbed. Further, since the filled lubricating oil is held by the notches 33, 33 'and the recesses 32, 32', the lubricating oil does not escape and the bending performance of the chain 1 can be improved. Further, the seal ring 26 has its inner tops 29, 29 'and outer tops 30, 30' constantly urged outwards, so that the seal chain 1 is deformed by its drive, so that the pin Even if the gap between the link plate 2 and the roller link plate 6 changes to some extent, the seal ring 26 has the outer ends 29a, 29'a, 30a, 30'a of its tops 29, 29 ', 30, 30'. The movement of the plates 2, 6 can be followed, so that the sealing performance of the lubricating oil is not impaired.

As shown in FIGS. 2 (a) and 2 (b), the recesses 32, 32 'are formed.
, 35 '... are formed at predetermined intervals in the center of the projections 35, ..., 35' ... so that the amount of deformation of the seal ring 26 due to the crushing of the pin link plate 2 and the roller link plate 6 is changed. It may be configured so as to more reliably prevent leakage of the lubricating oil sealed in the gaps between the recesses 32 and 32 'and the link plates 2 and 6 by being supported by.

(G) Effect of the Invention As described above, according to the present invention, the arc surface A is formed on the inner side of the seal ring 26 and the notches 33, 33 'are formed on both sides of the central portion 27 thereof. Further, the outer diameter ends 30, 30 'of the seal ring 26 are formed in a lip shape, and arcuate recesses 32, 32' are formed on both side portions from the outer diameter ends 30, 30 'to the arc surface A. Therefore, the deformation due to the crushing can be absorbed by the notch portions 33 and 33 'to prevent the deformation of the seal ring main body, and the outer end portions 29a and 29'a of the arc surface A and the lip can be prevented. The outer diameter ends 30 and 30 'allow the pin link plate 2 and the roller link plate 6 to come into light contact with each other to maintain the bending performance of the chain 1 in good condition. Enclosed lubricating oil and recess 3
It is possible to reliably seal and hold the lubricating oil in 2, 32 ', improve the bending performance of the chain 1 and enhance the transmission efficiency.

Then, when the chain is assembled, the roller link plate 6 and the pin link plate 2 are positioned apart from each other, and the pin ring 3 is pressed toward the roller link plate 6 from the state in which the seal ring 26 is positioned on the pin 3. When assembling the pin 3 by crimping while compressing the seal ring 26, the inner part of the seal ring 26 is formed by cutting out the middle part and both side parts of the arcuate surface A, and the end surface is an arc. 3 tops 29, 27, 2 consisting of faces
9 ', the seal ring 26 has a circular arc surface A
Slides on the end face of the bush, and climbs smoothly onto the end of the bush 7 without twisting, and the seal ring 26
Can be easily and accurately mounted in a proper position.

In addition, the inner portion of the seal ring 26 is formed by notching and forming an arc surface into small notches 33, 33 '.
7, 29, 29 ', the inner portion has a high rigidity and is not easily deformed, and the inner width a of the sealing is larger than the outer width b, so that a high seal is obtained. The performance can be maintained for a long time, and the life of the chain can be improved.

Further, the inner portion of the seal ring having high rigidity is located at a position close to the center of swing near the bush 7, and the outer portion of the seal ring located far from the center is
Since it has a lip shape and the width b is small, the bending performance of the chain can be favorably maintained in combination with the lubricating oil exuding in the inner portion while maintaining the sealing performance. .

In addition, a large number of protrusions 35 ..., 3 are formed in the recesses 32, 32 '.
If 5 '... is formed, the crushing force from the pin link plate 2 and the roller link plate 6 with respect to the seal ring 26 can be limited, and the deformation of the depressions 32, 32' can be regulated. , 32 'can be prevented from being pushed out and the lubricating oil can be held more reliably.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view showing a seal ring according to the present invention,
2 (a) is an enlarged sectional view showing another embodiment, FIG. 2 (b) is a partially cutaway plan view, and FIG. 3 is a sectional view showing a state in which a conventional seal ring is attached to a chain. Is. And, FIG. 4 and FIG. 5 are sectional views showing a conventional seal ring. 1 ... Chain (seal chain), 2 ... Pin link plate, 3 ... Pin, 6 ... Roller link plate, 7 ... Bushing, 26 ... Seal ring, 27, 29, 29 '... Top part, 30, 30' ... Outer diameter end (Top), 32, 32 '... depression, 33, 33' ... notch, A ... arc surface.

Claims (2)

[Scope of utility model registration request] 1. Lubricating oil filled in a gap between a pin and a bush by protruding a bush end from a roller link plate and enclosing a seal ring between the roller link plate and the pin link plate so as to surround the bush end. In a chain configured to seal, a circular arc surface is formed on an inner portion of the seal ring that abuts the bush, and a small cutout portion is formed between the central portion and both side portions of the circular arc surface. Then, three apex portions whose end faces are circular arc surfaces are formed on the inner portion, and further, the outer diameter end of the seal ring is formed in a lip shape, and both side portions from the outer diameter end to the circular arc surface are formed. An arc-shaped recess is formed on the inner surface of the seal ring, and the width of the inner portion of the seal ring on both sides is larger than the width of the outer portion of the lip-shaped outer diameter ends by a predetermined amount. It was, the chain of the sealing device. 2. The chain seal device according to claim 1, which is a range of utility model registration in which a large number of projections are formed in the arcuate recess.