JP2021148141A - Seal member - Google Patents

Abstract

To provide a seal member which can improve stability as one of purposes.SOLUTION: A seal member 100 in one embodiment, being a seal member arranged between an outside member 34 and an inside member 32 has a first seal body 10, and a second seal body 20 arranged while adjoining the first seal body 10, and different from the first seal body 10. The first seal body 10 has a first ring part 11 internally fit to the outside member 34, a first lip part 12 abutting on the inside member 32, and a first connecting part 14 for connecting the first ring part 11 and the first lip part 12. The second seal body 20 has a second ring part 21 internally fit to the outside member 34, a second lip part 22 abutting on the inside member 32, and a second connecting part 24 for connecting the second ring part 21 and the second lip part 22. The second ring part 21 is superimposed on the first lip part 12 when viewed from a radial direction.SELECTED DRAWING: Figure 2

Description

The present invention relates to a sealing member.

Sealing members for sealing spaces are known. For example, Patent Document 1 describes a seal body that prevents fluid from flowing between an external space outside the device and an internal space inside the device. The seal body described in Patent Document 1 includes a seal member having a seal portion that is pressed against the surface of the device, and a preventive portion that prevents foreign matter generated in the internal space from entering the seal portion. The prevention portion includes a lip portion that is pressed against the surface of the device, and the lip portion isolates the sealing portion from the internal space.

Japanese Unexamined Patent Publication No. 2018-40436

In the seal body described in Patent Document 1, the preventive portion is fitted on the inner peripheral surface of the device, and the contact width of the preventive portion with the inner peripheral surface of the device is small. , Proper positioning is not done and stability is lacking.

The present invention has been made in view of such a problem, and one of the objects of the present invention is to provide a sealing member capable of improving stability.

In order to solve the above problems, the seal member of an embodiment of the present invention is a seal member arranged between the inner member and the outer member, and is adjacent to the first seal body and the first seal body. It has a second seal body that is arranged and separate from the first seal body. The first seal body has a first ring portion that is internally fitted to the outer member, a first lip portion that abuts on the inner member, and a first connection portion that connects the first ring portion and the first lip portion. .. The second seal body has a second ring portion that is internally fitted to the outer member, a second lip portion that abuts on the inner member, and a second connection portion that connects the second ring portion and the second lip portion. .. The second ring portion overlaps with the first lip portion when viewed from the radial direction.

It should be noted that any combination of the above components and those in which the components and expressions of the present invention are mutually replaced between methods, systems and the like are also effective as aspects of the present invention.

According to the present invention, it is possible to provide a sealing member capable of improving stability.

It is a side cross-sectional view schematically showing an example of the rotating apparatus provided with the seal member which concerns on embodiment. It is a side sectional view which shows the 1st example of the seal member which concerns on embodiment. It is a side sectional view which shows the 2nd example of the seal member which concerns on embodiment.

Hereinafter, the present invention will be described with reference to each drawing based on a preferred embodiment. In the embodiments and modifications, the same or equivalent components and members are designated by the same reference numerals, and redundant description will be omitted as appropriate. In addition, the dimensions of the members in each drawing are shown enlarged or reduced as appropriate for easy understanding. In addition, some of the members that are not important for explaining the embodiment in each drawing are omitted and displayed.

In addition, terms including ordinal numbers such as 1st and 2nd are used to describe various components, but this term is used only for the purpose of distinguishing one component from other components, and this term is used. The components are not limited by.

[Embodiment]
Hereinafter, the configuration of the seal member 100 according to the embodiment will be described with reference to the drawings. FIG. 1 is a side sectional view showing a rotating device 1 to which the seal member 100 according to the embodiment of the present invention is applied. The rotating device 1 includes an inner member 32, an outer member 34, and a bearing 40. As an example, the rotating device 1 may be a speed reducer or an eccentric swing type speed reducer. In this case, the inner member 32 corresponds to the carrier, the outer member 34 corresponds to the cylindrical casing covering the outer periphery of the carrier, and the bearing 40 corresponds to the main bearing.

Hereinafter, the direction along the central axis La of the inner member 32 of the rotating device 1 is referred to as the "axial direction", and the circumferential direction and the radial direction of the circle centered on the central axis La are the "circumferential direction" and the "diameter", respectively. Direction. " The central axis La in this example coincides with the rotation axis of the inner member 32. A bearing 40 is provided between the inner member 32 and the outer member 34. The inner member 32 is arranged in the outer member 34 and is rotatably supported relative to the outer member 34.

The bearings 40 are arranged on one side and the other side in the axial direction of the outer member 34 and the inner member 32. The bearing 40 has a plurality of rolling elements 42 arranged at intervals in the circumferential direction. In the example of FIG. 1, the inner ring raceway surface of the bearing 40 is formed on the outer peripheral surface of the inner member 32, and the outer ring raceway surface is formed on the outer ring 41 fitted to the inner peripheral surface of the outer member 34. That is, the outer ring 41 of the bearing 40 is formed separately from the outer member 34. A lubricant is held in the bearing 40. When the rotating device 1 is a speed reducer, the lubricant is sealed not only in the bearing 40 but also in the internal space (space in which the speed reduction mechanism is arranged) partitioned by the outer member 34 and the inner member 32.

In the space between the inner member 32 and the outer member 34, the region where the bearing 40 for holding the lubricant is arranged and sealed by the seal member 100 is referred to as "lubricant holding space J". Further, in the ventilation path from the lubricant holding space J to the external space of the rotating device 1, the side approaching the lubricant holding space J is referred to as an "internal side", and the opposite side is referred to as an "external side".

FIG. 2 is a cross-sectional view showing a first example of the seal member 100 of the present embodiment. This figure shows a side cross section cut along the radial direction (axial direction). The seal member 100 is arranged between the inner member 32 and the outer member 34 on the outer side of the lubricant holding space J. The seal member 100 seals between the inner member 32 and the outer member 34 which is arranged so as to be relatively rotatable with the inner member 32. When the inner member 32 and the outer member 34 rotate relative to each other, the seal member 100 rotates relative to the inner member 32 integrally with the outer member 34.

The seal member 100 has a first seal body 10 and a second seal body 20 which is arranged adjacent to the first seal body 10 and is separate from the first seal body 10. The first seal body 10 and the second seal body 20 are annular bodies that surround the inner member 32. The first seal body 10 has substantially the same cross section in the circumferential direction. The second seal body 20 has substantially the same cross section in the circumferential direction. There is no limitation on the arrangement of the first seal body 10 and the second seal body 20, but in this example, the first seal body 10 is arranged on the outer side of the second seal body 20.

The first seal body 10 connects the first ring portion 11 fitted in the outer member 34, the first lip portion 12 that abuts on the inner member 32, and the first ring portion 11 and the first lip portion 12. It has one connecting portion 14. The first sealing body 10 seals the gap between the outer member 34 and the inner member 32 by abutting the first lip portion 12 on the inner member 32. The first lip portion 12 functions as a main lip capable of suppressing leakage of the lubricant from the lubricant holding space J to the outside. Further, the first lip portion 12 has a dust strip at the outer end in the axial direction, which suppresses the intrusion of foreign matter from the outside.

The second seal body 20 connects the second ring portion 21 fitted in the outer member 34, the second lip portion 22 in contact with the inner member 32, and the second ring portion 21 and the second lip portion 22. It has two connecting portions 24. The second sealing body 20 seals the gap between the inner member 32 and the outer member 34 by abutting the second lip portion 22 on the inner member 32. The second lip portion 22 is a dust strip capable of suppressing leakage of the lubricant in the lubricant holding space J to the outside and suppressing foreign matter existing in the lubricant holding space J from entering the first lip portion 12. Functions as.

The first seal body 10 will be further described. As shown in FIG. 2, the first seal body 10 has an angular C-shaped cross section as a whole. The first seal body 10 has a first elastic member 17, a first metal ring 18, and a spring member 15. The first metal ring 18 is fixed to the first elastic member 17.

The first elastic member 17 covers the first metal ring 18. The first elastic member 17 includes a first connecting portion elastic portion 17p, a first ring portion elastic portion 17s, and a first lip portion elastic portion 17q. The first connecting portion elastic portion 17p is a hollow disk-shaped portion arranged in the first connecting portion 14, and covers the first connecting portion metal ring 18p described later. The elastic portion 17s of the first ring portion is a cylindrical portion arranged in the first ring portion 11 and covers the metal ring 18s of the first ring portion, which will be described later. The elastic portion 17q of the first lip portion is a cylindrical portion constituting the first lip portion 12. That is, the first elastic member 17 has an angular C-shaped cross section. The first elastic member 17 is made of a soft resin material such as rubber, and has a higher elasticity than the first metal ring 18.

The first metal ring 18 is a portion that does not come into contact with the inner member 32 and the outer member 34 by itself. The first metal ring 18 functions as a core material that maintains the shape of the first elastic member 17 within a certain range. The first metal ring 18 has a higher rigidity than the first elastic member 17, and particularly has a higher rigidity than the first lip portion 12. In this specification, "rigidity" is the difficulty of deformation with respect to an external force, and can be expressed by, for example, Young's modulus. That is, it can be said that when the Young's modulus is large, the rigidity is also large.

The first metal ring 18 includes a first connecting portion metal ring 18p and a first ring portion metal ring 18s. The first connecting portion metal ring 18p is a hollow disk-shaped portion arranged in the first connecting portion 14. The first ring portion metal ring 18s is a hollow cylindrical portion arranged in the first ring portion 11. The first ring portion metal ring 18s is axially bent toward the second seal body 20 side in the axial direction from the radial outer end portion of the first connection portion metal ring 18p and extends in the axial direction. That is, the first metal ring 18 has an L-shaped side cross section. The first metal ring 18 can be made of a metal material such as an iron-based metal.

The spring member 15 urges the first lip portion 12 to the inner member 32. In other words, the first lip portion 12 is pressed against the outer peripheral surface of the inner member 32 by the spring member 15. When the first lip portion 12 is pressed against the inner member 32, a good sealing structure is formed between them. The spring member 15 is fitted into a circumferential groove formed on the outer peripheral surface of the first lip portion 12. The spring member 15 can be made of a metal material such as an iron-based metal.

The second seal body 20 will be further described. As shown in FIG. 2, the second seal body 20 has an L-shaped side cross section as a whole. The second seal body 20 has a second elastic member 27 and a second metal ring 28. The second metal ring 28 is fixed to the second elastic member 27.

The second elastic member 27 covers the second metal ring 28. The second elastic member 27 includes a second connecting portion elastic portion 27p, a second ring portion elastic portion 27s, and a second lip portion elastic portion 27q. The second connecting portion elastic portion 27p is a hollow disk-shaped portion arranged in the second connecting portion 24 and covers the second connecting portion metal ring 28p described later. The second ring portion elastic portion 27s is a cylindrical portion arranged in the second ring portion 21 and covers the second ring portion metal ring 28s described later. The elastic portion 27q of the second lip portion constitutes the second lip portion 22. The second elastic member 27 has an L-shaped side cross section. The second elastic member 27 is made of a relatively soft material and has a higher elasticity than the second metal ring 28.

The second metal ring 28 is a portion that does not come into contact with the inner member 32 and the outer member 34 by itself. The second metal ring 28 functions as a core material that maintains the shape of the second elastic member 27 within a certain range. The second metal ring 28 has a higher rigidity than the second elastic member 27, and particularly has a higher rigidity than the second lip portion 22.

The second metal ring 28 includes a second connecting portion metal ring 28p and a second ring portion metal ring 28s. The second connecting portion metal ring 28p is arranged in the second connecting portion 24, and the second ring portion metal ring 28s is arranged in the second ring portion 21. In this example, the second metal ring 28 is a hollow disk-shaped member in which the second connecting portion metal ring 28p and the second ring portion metal ring 28s are integrated, and has an I-shaped side cross section. The second metal ring 28 can be made of a metal material such as an iron-based metal.

In this example, the surface of the second metal ring 28 on the side opposite to the first seal body 10 is completely covered by the second elastic member 27, and the surface on the first seal body 10 side is partially covered. ..

In the example of FIG. 2, the first ring portion 11 and the second ring portion 21 are in contact with each other in the axial direction, and the first lip portion 12 and the second lip portion 22 are separated from each other in the axial direction so as to be deformable to each other. It has become. The first ring portion 11 and the second ring portion 21 may not be in contact with each other, or may be in contact with each other via a spacer or the like.

Further, the configuration of the present embodiment will be described.

In a general speed reducer such as for driving a robot joint, an oil seal having a lip is used to reduce leakage of the lubricant sealed inside. This lip may be less reliable due to the effects of wear debris on the gears and bearings of the reducer. Therefore, the seal member 100 of the present embodiment has a first seal body 10 and a second seal body 20 which is arranged adjacent to the first seal body 10 and is separate from the first seal body 10. By having the second seal body 20, the amount of wear debris reaching the first seal body 10 can be reduced.

As described above, the first seal body 10 has the first ring portion 11, the first lip portion 12, and the first connection portion 14, and the second seal body 20 has the second ring portion 21, the second lip portion 21, and the second lip portion 14. It has 22 and a second connection portion 24. It is conceivable to expand the fitting range between the second ring portion 21 and the outer member 34. The second ring portion 21 of the present embodiment overlaps with the first lip portion 12 when viewed from the radial direction. As shown in FIG. 2, the second ring portion 21 has an overlapping portion 23 that overlaps with the first lip portion 12, so that the fitting range between the second ring portion 21 and the outer member 34 can be expanded, and thus the outer side. The position of the second seal body 20 with respect to the member 34 is stable.

It is conceivable to widen the overlapping portion 23. In the present embodiment, the first seal body 10 has a spring member 15 that urges the first lip portion 12 to the inner member 32, and the second ring portion 21 has the spring member 15 when viewed from the radial direction. Overlaps with. In this case, the overlapping portion 23 can be made wider. As shown in FIG. 2, the second ring portion 21 extends in the axial direction beyond the end portion 15j of the spring member 15 on the second seal body 20 side to a range where it overlaps with the spring member 15.

In the present embodiment, the second ring portion 21 does not reach the end portion 15h of the spring member 15 on the side far from the second seal body 20 (anti-second seal body 20 side) in the axial direction. As shown in FIG. 2, the second ring portion 21 extends in the axial direction to the front of the end portion 15h. In this case, the fitting range of the first ring portion 11 with the outer member 34 can be increased. The second ring portion 21 may reach the contact point between the first lip portion 12 and the inner member (center of the spring member 15), or may exceed the end portion 15h of the spring member.

It is conceivable to stabilize the axial position of the second seal body 20. In the present embodiment, the second seal body 20 is positioned in the axial direction by the outer ring 41 of the bearing 40 adjacent to the anti-first seal body 10 side (right side in the drawing) of the second seal body 20. In this case, since the second seal body 20 is supported in the axial direction by the outer ring 41, the axial position of the second seal body 20 can be stabilized. As shown in FIG. 2, the second ring portion 21 is positioned by being in contact with the end face of the outer ring 41, and the first ring portion 11 is positioned by being in contact with the end face of the second ring portion 21. In this case, the positioning work when incorporating the seal member 100 becomes easy. Since the radial intermediate portion of the second seal body 20 is supported by the end surface of the outer ring 41, the posture of the second seal body 20 is stable.

In the present embodiment, the first seal body 10 and the second seal body 20 are made of different materials. For example, the first seal body 10 can be formed of a material that does not allow oil to pass through in order to block the lubricant. An example of such a material is a resin such as rubber. The second seal body 20 can be formed of a material that allows oil to pass through but does not allow foreign matter such as abrasion powder to pass through. Felt is an example of such a material. In this case, a material suitable for each function can be selected. Further, for example, the first seal body 10 may be made of synthetic rubber, and the second seal body 20 may be made of a plastic resin such as PTFE or polyurethane.

Next, a second example of the seal member 100 will be described with reference to FIG. FIG. 3 is a side sectional view showing a second example of the seal member 100 of the present embodiment, and corresponds to FIG. In the second example, the shape of the second metal ring 28 is different from that in the first example, and the other configurations are the same. Therefore, the second metal ring 28 will be mainly described without duplicating the description.

In the second example, the second metal ring 28 has a second connection portion metal ring 28p arranged on the second connection portion 24 and a second metal ring 28p in the axial direction from the radial outer end portion of the second connection portion metal ring 28p. 1 It has a second ring portion metal ring 28s that is bent on the 10 side (left side in the drawing) and arranged on the second ring portion 21. The second metal ring 28 is different from the first example of FIG. 2 in that the second ring portion metal ring 28s has a cylindrical shape and therefore has an L-shaped side cross section as a whole. In this case, the rigidity of the second ring portion 21 can be increased, and the position of the second seal body 20 with respect to the outer member 34 becomes more stable.

The examples of the embodiments of the present invention have been described in detail above. All of the above-described embodiments are merely specific examples for carrying out the present invention. The content of the embodiment does not limit the technical scope of the present invention, and many design changes such as changes, additions, and deletions of components are made without departing from the idea of the invention defined in the claims. It is possible. In the above-described embodiment, the contents that can be changed in such a design are described with the notations such as "in the embodiment" and "in the embodiment", but the contents are designed without such notations. It's not that changes aren't tolerated. Further, the hatching attached to the drawing does not limit the material to which the hatching is attached.

[Modification example]
Hereinafter, a modified example will be described. In the drawings and description of the modified examples, the same or equivalent components and members as those in the embodiment are designated by the same reference numerals. The description that overlaps with the embodiment will be omitted as appropriate, and the configuration different from the embodiment will be mainly described.

In the description of the embodiment, an example in which the second ring portion 21 overlaps with the spring member 15 when viewed from the radial direction is shown, but it is not essential that these overlap with each other, and the second ring portion 21 overlaps with the spring member 15. It may be a configuration that does not overlap with.

In the description of the embodiment, an example in which the first seal body 10 and the second seal body 20 are made of different materials is shown, but the first seal body 10 and the second seal body 20 are made of the same material. May be good.

In the description of the embodiment, the example in which the seal member 100 includes two seal bodies of the first seal body 10 and the second seal body 20 is shown, but the seal member may include three or more seal bodies.

In the description of the embodiment, an example in which the second ring portion 21 is in contact with the end surface of the outer ring 41 is shown, but it is not essential that the second ring portion 21 is in contact with the outer ring 41, and these may be non-contact. For example, the second ring portion may be positioned by contacting a step portion provided on the outer member.

In the description of the embodiment, the first seal body 10 and the second seal body 20 are configured to have an elastic member and a metal ring, but the present invention is not limited to this, and the elastic member does not have a metal ring. It may be composed of. Generally, in this case, the radial thickness of the ring portion is larger than that of the embodiment, and the radial thickness of the connecting portion is relatively small.

Each of the above-mentioned modifications has the same operation and effect as that of the embodiment.

Any combination of each of the above-described embodiments and modifications is also useful as an embodiment of the present invention. The new embodiments resulting from the combination have the effects of each of the combined embodiments and variants.

1 Rotating device, 10 1st seal body, 11 1st ring part, 12 1st lip part, 14 1st connection part, 15 Spring member, 17 1st elastic member, 18 1st metal ring, 20 2nd seal body, 21 2nd ring part, 22 2nd lip part, 24 2nd connection part, 27 2nd elastic member, 28 2nd metal ring, 28p 2nd connection part metal ring, 28s 2nd ring part metal ring, 32 inner member, 34 outer member, 40 bearing, 41 outer ring, 100 seal member.

Claims (6)

A seal member arranged between the inner member and the outer member.
It has a first seal body and a second seal body that is arranged adjacent to the first seal body and is separate from the first seal body.
The first seal body is a first connection that connects a first ring portion that is internally fitted to the outer member, a first lip portion that abuts on the inner member, and the first ring portion and the first lip portion. With a part,
The second seal body has a second ring portion that is internally fitted into the outer member, a second lip portion that abuts on the inner member, and a second connection that connects the second ring portion and the second lip portion. With a part,
The second ring portion is a sealing member that overlaps with the first lip portion when viewed from the radial direction. The first seal body has a spring member that urges the first lip portion to the inner member, and the second ring portion overlaps with the spring member when viewed from the radial direction. The seal member according to claim 1. The seal member according to claim 2, wherein the second ring portion does not reach an end portion of the spring member on the side far from the second seal body in the axial direction. The second seal body according to any one of claims 1 to 3, wherein the second seal body is positioned in the axial direction by an outer ring of a bearing adjacent to the first seal body side of the second seal body. Seal member. The second seal body has an elastic member and a metal ring fixed to the elastic member.
The metal ring is bent toward the first seal body side in the axial direction from the radial outer end portion of the second connecting portion metal ring and the second connecting portion metal ring arranged in the second connecting portion. The seal member according to any one of claims 1 to 4, further comprising a second ring portion metal ring arranged on the second ring portion. The sealing member according to any one of claims 1 to 5, wherein the first sealing body and the second sealing body are made of different materials.

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