JP4255787B2 - Seal chain - Google Patents

Description

  The present invention provides a lubricant, such as grease, having sealing means interposed between opposing surfaces of an inner plate and an outer plate, and sealed in a bearing portion constituted by an inner peripheral surface of a bush and an outer peripheral surface of a pin by the sealing means. The present invention relates to a seal chain that prevents leakage of dust to the outside and prevents dust from entering the bearing portion from the outside.

  Conventionally, in a general seal chain, a lubricant such as grease sealed in a bearing portion constituted by an inner peripheral surface of a bush and an outer peripheral surface of a pin is prevented from leaking to the outside and the bearing portion is externally exposed. As a sealing means for preventing dust from entering, an O-ring disposed between opposing surfaces of an inner plate and an outer plate is known.

  Further, in a seal chain in which a sealing means is interposed between the opposing surfaces of the inner plate and the outer plate, dust from the outside enters through a gap between the sealing means and the outer plate that is slidably pressed by elastic force. The first rigid seal member that seals between the first rigid seal member and the first rigid seal member and the inner plate is disposed between the first rigid seal member and the inner plate to prevent dust from entering from between the first rigid seal member and the inner plate. An elastic seal that seals intrusion of dust from the outside to the bearing side from a gap between the first elastic member that is arranged and the outer plate that is disposed radially inward of the first rigid seal member and that is in sliding contact with the elastic force A member, a second rigid seal member disposed between the elastic seal member and the inner plate, and a first rigid seal member disposed between the first rigid seal member and the second rigid seal member toward the outer plate. Those having a second elastic member for pressing I (e.g., see Patent Document 1).

JP 2000-136848 A

However, in the general seal chain described above, since the O-ring slides with the inner plate, the outer plate, or both the inner and outer plates when the seal chain is bent, the O-ring is worn and the sealing effect is likely to deteriorate. There was a problem.
In addition, when the lubricant such as grease has run out at the sliding portion of the O-ring, the sliding resistance between the O-ring and each of the inner and outer plates increases, and the O-ring breaks in a short period of time and does not perform the sealing effect. There was a problem.
Further, since the outer diameter side of the O-ring is exposed to the outside, there is a problem that dust from the outside directly collides with or comes into contact with the O-ring and the O-ring deteriorates early.

Further, the seal chain disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 2000-136848 has a first rigid seal member and an elastic seal member that are in sliding contact with the outer plate having a rough surface when the seal chain is bent. Unless special processing is performed to increase the surface roughness of the slidable contact surface of the plate (for example, grinding the slidable contact surface of the outer plate), the sealing performance is low and a lubricant such as grease is sealed in the bearing. There is a problem that it is difficult to hold.
In addition, the special processing for increasing the surface roughness of the sliding surface of the outer plate has a problem that a great amount of cost is generated and the cost is increased.

  Therefore, an object of the present invention is to provide a seal chain that has high sealing performance and does not increase costs.

  According to the first aspect of the present invention, in the seal chain in which the sealing means is interposed between the opposing surfaces of the inner plate and the outer plate, the sealing means is opposed to each other between the opposing surfaces of the inner plate and the outer plate. A pair of annular seal members disposed, and the pair of annular seal members are made of an elastic body, and the pair of annular seal members are arranged to have an annular lip-shaped convex portion and an annular lip-shaped convex portion on surfaces facing each other. And the tip of the annular lip-shaped convex portion is pressed against and contacted with the bottom of the annular concave portion by the elasticity of the pair of annular seal members, and the annular ring member is bent when the seal chain is bent. The tip part of the lip-shaped convex part and the bottom part of the annular concave part slide.

  According to a second aspect of the present invention, in the seal chain according to the first aspect, the pair of annular seal members are each provided with an elastic seal member on a surface facing the inner plate or the outer plate, and the elastic seal member It abuts against the plate or the outer plate.

  According to a third aspect of the present invention, there is provided a seal chain in which a sealing means is interposed between opposing surfaces of an inner plate and an outer plate, and the sealing means is opposed to each other between the opposing surfaces of the inner plate and the outer plate. A pair of annular seal members disposed, the pair of annular seal members has a plurality of concentric annular convex portions and a plurality of annular concave portions into which the annular convex portions are respectively fitted on mutually facing surfaces; A sealing space formed between the peripheral surfaces of the plurality of annular projections and the opposing surfaces except for the annular projections and the annular recesses of the pair of annular seal members; Elastic seal members are respectively mounted on the surfaces facing the inner plate or the outer plate, the elastic seal members abut against the inner plate or the outer plate, and the pair of annular seals when the seal chain is bent. Wood is to slide fitting surface of the annular projection and the annular recess.

  According to a fourth aspect of the present invention, in the seal chain in which the sealing means is interposed between the opposing surfaces of the inner plate and the outer plate, the sealing means is disposed so as to be opposed between the opposing surfaces of the inner plate and the outer plate. A pair of annular seal members and an intermediate annular seal member made of an elastic body disposed between the pair of annular seal members, each of the pair of annular seal members having an annular recess on a surface facing each other. The intermediate annular seal member is fitted into both of the annular recesses, and the pair of annular seal members is provided with an elastic seal member on a surface facing the inner plate or the outer plate, respectively. When the seal chain is bent, the pair of annular seal members are in contact with the inner plate or the outer plate, and the mating surface between the intermediate annular seal member and the annular recess It is intended to slide.

  According to a fifth aspect of the present invention, in the seal chain according to any one of the first to fourth aspects, the sealing means has an outer annular seal member made of a rigid body disposed on the outer peripheral side of the pair of annular seal members. It is.

According to the first aspect of the present invention, when the seal chain is bent, one of the pair of annular seal members, which is in contact with the elasticity of the one annular seal member itself, rotates together with the inner plate, The other annular seal member, which is in contact with the elasticity of the other annular seal member itself, rotates together with the outer plate.
Therefore, when the seal chain is bent, the tip of the annular lip-shaped convex portion of one annular seal member slides at the bottom of the annular concave groove of the other annular seal member, and the annular portion of the other annular seal member The tip of the lip-shaped convex portion slides at the bottom of the annular concave groove of one annular seal member.
Therefore, since the inner plate and the outer plate can be used in a state where shot blasting is performed, the cost can be reduced by that amount without requiring special processing.

Further, since one annular seal member is in contact with the outer surface of the inner plate due to the elasticity of one annular seal member itself of the pair of annular seal members, lubrication between the one annular seal member and the inner plate is performed. Prevents agent leakage and external dust intrusion.
Similarly, the other annular seal member is in contact with the inner surface of the outer plate due to the elasticity of the other annular seal member itself of the pair of annular seal members. Prevent leakage of lubricant and ingress of dust from outside.

  Further, by utilizing the elasticity of the pair of annular seal members, the tip portions of the annular lip-shaped convex portions come into contact with the bottom portions of the opposed annular concave grooves, thereby enhancing the sealing effect and improving the inner plate and the outer plate. It is possible to follow changes in the interval.

  Moreover, since the lubricant is filled between the pair of elastic seal members, the wear of the annular lip-shaped convex portion can be reduced, and the life of the pair of elastic seal members can be extended. .

According to the second aspect of the present invention, the elastic seal member mounted on one of the pair of annular seal members facing the inner plate is in contact with the outer surface of the inner plate by elastic deformation. Further, leakage of the lubricant from between the one annular seal member of the pair of annular seal members and the inner plate and intrusion of dust from the outside are prevented.
Similarly, the elastic seal member mounted on the other annular seal member facing the outer plate of the pair of annular seal members is in contact with the inner surface of the outer plate due to elastic deformation. This prevents leakage of lubricant from between the other annular seal member and the outer plate and intrusion of dust from the outside.

  Further, by utilizing the repulsive force of elastic deformation of the elastic seal member and the elasticity of the pair of annular seal members, the tips of the annular lip-shaped convex portions abut against the bottom portions of the corresponding annular concave grooves, respectively. It is possible to enhance the effect and follow the change in the distance between the inner plate and the outer plate.

Further, the elastic seal member only undergoes compressive deformation and does not slide with the inner plate or the outer plate, and therefore, the function is not deteriorated due to sliding friction.
Therefore, the lifetime of the elastic seal member can be extended.

According to the invention described in claim 3, when the seal chain is bent, the one annular seal member that abuts via the elastic seal member rotates together with the inner plate, and the other annular seal member that abuts via the elastic seal member. Rotates with the outer plate.
Therefore, when the seal chain is bent, the annular convex portion of one annular seal member slides in the fitting portion of the annular concave groove of the other annular seal member, and the annular convex portion of the other annular seal member is one annular It slides at the fitting portion of the annular concave groove of the seal member.
The elastic seal member only abuts against the inner plate or the outer plate, and does not slide with respect to the outer surface of the inner plate or the inner surface of the outer plate.
Therefore, since the inner plate and the outer plate can be used in a state where shot blasting is performed, the cost can be reduced by that amount without requiring special processing.

Further, when the annular convex portions of the pair of annular seal members are fitted into the corresponding annular concave grooves, the peripheral surfaces of the plurality of annular convex portions and the annular convex portions and the annular concave portions of the pair of annular seal members are excluded. Compressed air exists in the sealed space formed between the opposing surfaces, and the compressed air causes the one annular seal member and the other annular seal member to move to the inner plate and the outer plate, respectively. Pressed.
Thereby, the contact pressure of the bottom part of the annular groove corresponding to the tip part of the annular convex part can be kept low, and wear of the tip part of the annular convex part can be restrained.

  In addition, since both the pair of annular seal members can use the same member, either an elastic body or a rigid body, it is possible to prevent the wear of the same material from being accelerated.

Further, since the elastic seal member is in contact with the outer surface of the inner plate due to elastic deformation, leakage of the lubricant from between the one annular seal member and the inner plate and intrusion of dust from the outside are prevented.
Similarly, since the elastic seal member is in contact with the inner surface of the outer plate due to elastic deformation, leakage of the lubricant from between the other annular seal member and the outer plate and intrusion of dust from the outside are prevented.

  Further, by utilizing the repulsive force of elastic deformation of the elastic seal member, the tip portion of the annular convex portion comes into contact with the bottom portion of the annular concave groove, thereby enhancing the sealing effect and changing the distance between the inner plate and the outer plate. Can be followed.

Further, the elastic seal member only undergoes compressive deformation, and does not slide with the inner plate or the outer plate. Therefore, the function is not deteriorated due to sliding friction.
Therefore, the lifetime of the elastic seal member can be extended.

  Further, since the lubricant is filled between the pair of annular seal members, wear of the fitting portion between the annular convex portion and the annular concave groove can be reduced, and the life of the pair of annular seal members can be extended.

According to the fourth aspect of the present invention, when the seal chain 1 is bent, the one annular seal member that abuts via the elastic seal member rotates together with the inner plate and the other annular abutment that abuts via the elastic seal member. The seal member rotates together with the outer plate.
Therefore, when the seal chain is bent, the pair of annular seal members slide at the fitting portion between the intermediate annular seal member and the annular groove.
The elastic seal member only abuts against the inner plate or the outer plate, and does not slide with respect to the outer surface of the inner plate or the inner surface of the outer plate.
Therefore, since the inner plate and the outer plate can be used in a state in which shot blasting is performed, the cost can be reduced by that amount without requiring special processing.

Further, since the elastic seal member is in contact with the outer surface of the inner plate due to elastic deformation, leakage of the lubricant from between the one annular seal member and the inner plate and intrusion of dust from the outside are prevented.
Similarly, since the elastic seal member is in contact with the inner surface of the outer plate due to elastic deformation, leakage of the lubricant from between the other annular seal member and the outer plate and intrusion of dust from the outside are prevented.

  Further, by utilizing the repulsive force of elastic deformation of the elastic seal member, the intermediate annular seal member abuts against the bottom of each annular groove, thereby enhancing the sealing effect and following the change in the distance between the inner plate and the outer plate. Can be made.

Further, the elastic seal member only undergoes compressive deformation, and does not slide with the inner plate or the outer plate. Therefore, the function is not deteriorated due to sliding friction.
Therefore, the lifetime of the elastic seal member can be extended.

  Moreover, since the lubricant is filled between the pair of annular seal members, wear of the fitting portion between the intermediate annular seal member and the annular groove can be reduced, and the life of the pair of annular seal members can be extended.

According to the fifth aspect of the present invention, the gap provided between the outer peripheral surface of the pair of annular seal members and the inner peripheral surface of the outer annular seal member is used as a lubricant reservoir, thereby further enhancing the sealing effect. While being able to hold | maintain, the effect which prevents the penetration | invasion of the dust from the outside can be heightened.
Further, the outer annular seal member can prevent the pair of annular seal members from being deteriorated by dust or water from the outside, and as a result, the life of the pair of annular seal members can be extended.

  The seal chain of the present invention includes a pair of bushes and an inner link having a pair of inner plates coupled by the bushes, and a pair of pins and an outer link having a pair of outer plates coupled by the pins. Bearings constituted by the inner peripheral surface of the bush and the outer peripheral surface of the pin by means of the sealing means. The seal means are interposed between the opposing surfaces of the inner plate and the outer plate. Each of the embodiments of the present invention will be described below, which prevents the lubricant enclosed in the portion from leaking to the outside and prevents the dust from entering the bearing portion from the outside.

A seal chain that is Embodiment 1 of the present invention will be described with reference to FIGS.
FIG. 1 is a partial cross-sectional plan view of a seal chain to which the present invention is applied.
FIG. 2 is an enlarged cross-sectional view of a main part in the elliptical frame in FIG. 1 of the seal chain that is Embodiment 1 of the present invention.

As shown in FIG. 1, the seal chain 1 according to the first embodiment of the present invention includes a plurality of inner links 2 and outer links 6.
The plurality of inner links 2 and outer links 6 are alternately connected to form a seal chain 1.

The inner link 2 includes a pair of bushes 3, 3, a pair of inner plates 4, 4 and a roller 5, and the pair of inner plates 4, 4 are coupled to both ends of the pair of bushes 3, 3 by press-fitting, The roller 5 is rotatably inserted into the outer peripheral surface of each bush 3.
The outer link 6 includes a pair of pins 7 and 7 and a pair of outer plates 8 and 8, and the pair of outer plates 8 and 8 are coupled to both ends of the pair of pins 7 and 7.
Further, the inner link 2 and the outer link 6 are connected to each bush 3 by inserting each pin 7 rotatably.
A bearing portion 9 is constituted by the inner peripheral surface of the bush 3 and the outer peripheral surface of the pin 7, and a lubricant such as grease is sealed in the bearing portion 9.
A pin 10 is attached to one end of the pin 7.
Although not shown, a nipple for filling a lubricant such as grease is attached to the head of the pin 7, and the bearing 9 is lubricated from the nipple through the oil supply passage in the shaft portion of the pin 7. The agent is filled.

  The seal chain shown in FIG. 1 is suitable for use as an unloader for roses such as bucket elevators and van conveyors (cereals, iron ore, coal, etc.), but is not limited to this, and can be applied to other conveyor chains. Furthermore, the present invention can be applied to a power transmission chain.

As shown in FIG. 2, the seal chain 1 of the first embodiment has a sealing means 11 interposed between the opposed surfaces of the inner plate 4 and the outer plate 8.
The sealing means 11 prevents the lubricant such as grease sealed in the bearing portion 9 constituted by the inner peripheral surface of the bush 3 and the outer peripheral surface of the pin 7 from leaking to the outside and Prevents dust from entering from the outside.

The sealing means 11 has a pair of annular seal members 12 and 14 disposed to face each other between the opposing surfaces of the inner plate 4 and the outer plate 8, and the pair of annular seal members 12 and 14 are both It is composed of an elastic body.
In this embodiment, a polyurethane resin is used as the elastic body.
Both ends of the bush 3 protrude outward from the outer surface of each inner plate 4, and the pair of annular seal members 12 and 14 are disposed on the outer diameter side of the protruding portion of the bush 3.
Further, the sealing means 11 has an outer annular seal member 17 made of a rigid body disposed on the outer peripheral side of the pair of annular seal members 12 and 14.

One annular seal member 12 of the pair of annular seal members 12 and 14 is disposed to face the outer surface of the inner plate 4.
The one annular seal member 12 has an annular lip-shaped convex portion 12a and an annular concave groove 12b formed on the surface facing the other annular seal member 14.
Further, the one annular seal member 12 has two annular grooves 12 c formed on the surface facing the outer surface of the inner plate 4.
An O-ring (elastic seal member) 13 is fitted in the annular grooves 12c.
Therefore, when one annular seal member 12 is assembled between the opposite surfaces of the inner plate 4 and the outer plate 8 together with the other annular seal member 14, the O-ring 13 is pressed against the outer surface of the inner plate 4. ing.

The other annular seal member 14 of the pair of annular seal members 12 and 14 is disposed to face the inner surface of the outer plate 8.
The other annular seal member 14 is formed with an annular lip-shaped convex portion 14 a and an annular concave groove 14 b on the surface facing the one annular seal member 12.
Further, the other annular seal member 14 has two annular grooves 14 c formed on the surface facing the inner surface of the outer plate 8.
An O-ring (elastic seal member) 15 is fitted in these annular grooves 14c.
Therefore, when the other annular seal member 14 is assembled between the opposing surfaces of the inner plate 4 and the outer plate 8 together with the one annular seal member 12, the O-ring 15 is pressed against the inner surface of the outer plate 8. ing.
Also, a lubricant such as grease is filled between the one annular seal member 12 and the other annular seal member 14.

Further, the annular lip-shaped convex portion 12a of one annular seal member 12 is fitted into the annular concave groove 14b of the other annular seal member 14, and similarly, the annular lip shape of the other annular seal member 14 is also provided. The convex portion 14 a is fitted in the annular concave groove 12 b of one annular seal member 12.
Then, due to the elasticity of the pair of annular seal members 12 and 14 and the repulsive force of the elastic deformation of the O-rings 13 and 15, the tip portions of the annular lip-shaped convex portions 12a and 14a are formed in the annular concave grooves 12b and 14b. It is in contact with the bottom.

Further, an outer annular seal member 17 made of a rigid body is disposed on the outer peripheral side of the pair of annular seal members 12 and 14.
The outer annular seal member 17 is preferably made of steel, for example.
A gap is provided between the outer peripheral surface of the pair of annular seal members 12 and 14 and the inner peripheral surface of the outer annular seal member 17, and the gap is filled with a lubricant such as grease.
A gap is provided between the both end surfaces of the outer annular seal member 17 and the outer surface of the inner plate 4 and the inner surface of the outer plate 8 so as to cope with a change in the distance between the inner plate 4 and the outer plate 8. ing.

Since the seal chain 1 shown in FIG. 2 is configured as described above, when the seal chain 1 is bent, one annular seal member 12 that abuts via the O-ring 13 rotates together with the inner plate 4. The other annular seal member 14 that abuts via the O-ring 15 rotates together with the outer plate 8.
Therefore, when the seal chain 1 is bent, the tip of the annular lip-shaped convex portion 12a of one annular seal member 12 slides at the bottom of the annular groove 14b of the other annular seal member 14, and the other annular seal member 12 The tip of the annular lip-shaped convex portion 14 a of the seal member 14 slides at the bottom of the annular concave groove 12 b of one annular seal member 12.
The O-rings 13 and 15 are only in contact with the inner plate 4 or the outer plate 8, respectively, and do not slide with respect to the outer surface of the inner plate 4 or the inner surface of the outer plate 8.
Therefore, since the inner plate 4 and the outer plate 8 can be used in a state in which shot blasting is performed, the cost can be reduced by that amount without requiring special processing.

Further, since the O-ring 13 is in contact with the outer surface of the inner plate 4 due to elastic deformation, leakage of a lubricant such as grease from between the one annular seal member 12 and the inner plate 4 and intrusion of dust from the outside are prevented. To prevent.
Similarly, since the O-ring 15 is in contact with the inner surface of the outer plate 8 due to elastic deformation, leakage of lubricant such as grease from between the other annular seal member 14 and the outer plate 8 and intrusion of dust from the outside. To prevent.

  Further, by utilizing the repulsive force of the elastic deformation of the O-rings 13 and 15 and the elasticity of the pair of annular seal members 12 and 14, the tip portions of the annular lip-shaped convex portions 12a and 14a are annular concave grooves 14b and 12b, respectively. By making contact with the bottom of the plate, it is possible to enhance the sealing effect and to follow the change in the distance between the inner plate 4 and the outer plate 8.

In addition, the O-rings 13 and 15 are only subjected to compressive deformation and do not slide with the inner plate 4 or the outer plate 8, so that the function is not deteriorated due to sliding friction.
Therefore, the life of the O-rings 13 and 15 can be extended.

  Further, since a lubricant such as grease is filled between the annular seal members 12 and 14 made of a pair of elastic bodies, the wear of the annular lip-shaped convex portions 12a and 14a can be reduced, and the annular made of a pair of elastic bodies. The lifetime of the sealing members 12 and 14 can be extended.

Further, a gap provided between the outer peripheral surface of the pair of annular seal members 12 and 14 and the inner peripheral surface of the outer annular seal member 17 is used as a reservoir for a lubricant such as grease, thereby further enhancing the sealing effect. It is possible to enhance the effect of preventing dust from entering from the outside.
Further, the outer annular seal member 17 can prevent deterioration of the pair of annular seal members 12 and 14 due to external dust and water, and as a result, the life of the pair of annular seal members 12 and 14 can be extended. it can.

Next, a seal chain that is Embodiment 2 of the present invention will be described with reference to FIG.
FIG. 3 is an enlarged cross-sectional view of the main part in the elliptical frame in FIG. 1 of the seal chain that is Embodiment 2 of the present invention.

  The seal chain 1 according to the second embodiment of the present invention is different from the seal chain 1 according to the first embodiment described above only in the sealing means 21 described later. The description about the part to perform is abbreviate | omitted and only the different sealing means 21 is demonstrated below.

As shown in FIG. 3, the seal chain 1 according to the second embodiment has a sealing means 21 interposed between opposing surfaces of the inner plate 4 and the outer plate 8.
The sealing means 21 prevents the lubricant such as grease sealed in the bearing portion 9 constituted by the inner peripheral surface of the bush 3 and the outer peripheral surface of the pin 7 from leaking to the outside and Prevents dust from entering from the outside.

The sealing means 21 has a pair of annular seal members 22 and 24 arranged to face each other between the opposed surfaces of the inner plate 4 and the outer plate 8, and the pair of annular seal members 22 and 24 are both It is composed of an elastic body.
In this embodiment, a polyurethane resin is used as the elastic body.
Both ends of the bush 3 protrude outward from the outer surface of each inner plate 4, and the pair of annular seal members 22, 24 are disposed on the outer diameter side of the protruding portion of the bush 3.
Further, the sealing means 21 has an outer annular seal member 27 made of a rigid body disposed on the outer peripheral side of the pair of annular seal members 22, 24.

One annular seal member 22 of the pair of annular seal members 22 and 24 is disposed to face the outer surface of the inner plate 4.
The one annular seal member 22 has an annular lip-shaped convex portion 22 a and an annular concave groove 22 b formed on the surface facing the other annular seal member 24.

The other annular seal member 24 of the pair of annular seal members 22 and 24 is disposed to face the inner surface of the outer plate 8.
The other annular seal member 24 has an annular lip-shaped convex portion 24 a and an annular concave groove 24 b formed on the surface facing the one annular seal member 22.
Also, a lubricant such as grease is filled between one annular seal member 22 and the other annular seal member 24.

Further, the annular lip-shaped convex portion 22a of one annular seal member 22 is fitted into the annular concave groove 24b of the other annular seal member 24, and similarly, the annular lip shape of the other annular seal member 24 is formed. The convex portion 24 a is fitted in the annular concave groove 22 b of one annular seal member 22.
Then, due to the elasticity of the pair of annular seal members 22 and 24, the tips of the annular lip-shaped convex portions 22a and 24a are in contact with the bottoms of the annular concave grooves 22b and 24b.
Further, due to the elasticity of the pair of annular seal members 22, 24, one annular seal member 22 is pressed against and pressed against the outer surface of the inner plate 4, and the other annular seal member 24 is placed on the inner surface of the outer plate 8. Pressed and pressed.

Further, an outer annular seal member 27 made of a rigid body is disposed on the outer peripheral side of the pair of annular seal members 22 and 24.
The outer annular seal member 27 is preferably made of steel, for example.
A gap is provided between the outer peripheral surfaces of the pair of annular seal members 22 and 24 and the inner peripheral surface of the outer annular seal member 27, and the gap is also filled with a lubricant such as grease.
A gap is provided between both end faces of the outer annular seal member 27 and the outer surface of the inner plate 4 and the inner surface of the outer plate 8 so as to cope with a change in the distance between the inner plate 4 and the outer plate 8. ing.

Since the seal chain 1 shown in FIG. 3 is configured as described above, when the seal chain 1 is bent, the one annular seal member 22 that abuts due to the elasticity of the one annular seal member 22 itself is combined with the inner plate 4. The other annular seal member 24 that rotates and contacts by the elasticity of the other annular seal member 24 itself rotates together with the outer plate 8.
Accordingly, when the seal chain 1 is bent, the tip of the annular lip-shaped convex portion 22a of one annular seal member 22 slides at the bottom of the annular groove 24b of the other annular seal member 24, and the other annular seal member 24 The tip of the annular lip-shaped convex portion 24 a of the seal member 24 slides at the bottom of the annular concave groove 22 b of one annular seal member 22.
Therefore, since the inner plate 4 and the outer plate 8 can be used in a state in which shot blasting is performed, the cost can be reduced by that amount without requiring special processing.

Further, since the one annular seal member 22 is in contact with the outer surface of the inner plate 4 by the elasticity of the one annular seal member 22 itself, lubrication of grease or the like from between the one annular seal member 22 and the inner plate 4 is performed. Prevents agent leakage and external dust intrusion.
Similarly, the other annular seal member 24 is in contact with the inner surface of the outer plate 8 due to the elasticity of the other annular seal member 24 itself, so that the grease or the like from between the other annular seal member 24 and the outer plate 8 can be removed. Prevent leakage of lubricant and ingress of dust from outside.

  Further, by utilizing the elasticity of the pair of annular seal members 22 and 24, the tip portions of the annular lip-shaped convex portions 22a and 24a abut against the bottom portions of the annular concave grooves 24b and 22b, respectively, thereby enhancing the sealing effect. At the same time, it is possible to follow the change in the distance between the inner plate 4 and the outer plate 8.

  Further, since a lubricant such as grease is filled between the annular seal members 22 and 24 made of a pair of elastic bodies, the wear of the annular lip-shaped convex portions 22a and 24a can be reduced, and the annular form made of a pair of elastic bodies. The lifetime of the sealing members 22 and 24 can be extended.

  Further, since the outer annular seal member 27 is arranged on the outer peripheral side of the pair of annular seal members 22 and 24, the outer annular seal member 27 has the same effect as the outer annular seal member 17 in the first embodiment.

Next, a seal chain that is Embodiment 3 of the present invention will be described with reference to FIG.
4 is an enlarged cross-sectional view of a main part in the elliptical frame in FIG. 1 of a seal chain that is Embodiment 3 of the present invention.

  For the seal chain 1 that is Embodiment 3 of the present invention, only the sealing means 31 described later is different from the seal chain 1 of Embodiment 1 described above, and therefore the same members are denoted by the same reference numerals, The description about the overlapping part is omitted, and only the different sealing means 31 will be described below.

As shown in FIG. 4, the seal chain 1 of the third embodiment has a sealing means 31 interposed between the opposed surfaces of the inner plate 4 and the outer plate 8.
The sealing means 31 prevents the lubricant such as grease sealed in the bearing portion 9 constituted by the inner peripheral surface of the bush 3 and the outer peripheral surface of the pin 7 from leaking to the outside and Prevents dust from entering from the outside.

The sealing means 31 has a pair of annular seal members 32 and 34 disposed to face each other between the opposing surfaces of the inner plate 4 and the outer plate 8, and the pair of annular seal members 32 and 34 are both It is composed of an elastic body.
In this embodiment, a polyurethane resin is used as the elastic body.
However, the pair of annular seal members 32 and 34 do not have to be elastic bodies, and may be rigid bodies.
Steel is used as the stiffness.
Both ends of the bush 3 protrude outward from the outer surface of each inner plate 4, and the pair of annular seal members 32 and 34 are disposed on the outer diameter side of the protruding portion of the bush 3.
Further, the sealing means 31 has an outer annular seal member 37 made of a rigid body disposed on the outer peripheral side of the pair of annular seal members 32 and 34.

One annular seal member 32 of the pair of annular seal members 32, 34 is disposed to face the outer surface of the inner plate 4.
The one annular seal member 32 is formed with a plurality of concentric annular convex portions 32 a and annular concave portions 32 b on the surface facing the other annular seal member 34.
Further, the one annular seal member 32 is formed with two annular grooves 32 c on the surface facing the outer surface of the inner plate 4.
An O-ring (elastic seal member) 33 is fitted in the annular grooves 32c.
Therefore, when one annular seal member 32 is assembled between the opposing surfaces of the inner plate 4 and the outer plate 8 together with the other annular seal member 34, the O-ring 33 is pressed against the outer surface of the inner plate 4. ing.

The other annular seal member 34 of the pair of annular seal members 32, 34 is disposed to face the inner surface of the outer plate 8.
The other annular seal member 34 is formed with a plurality of concentric annular convex portions 34 a and annular concave portions 34 b on the surface facing the one annular seal member 32.
Further, the other annular seal member 34 is formed with two annular grooves 34 c on the surface facing the inner surface of the outer plate 8.
An O-ring (elastic seal member) 35 is fitted into the annular grooves 34c.
Therefore, when the other annular seal member 34 is assembled between the opposing surfaces of the inner plate 4 and the outer plate 8 together with the one annular seal member 32, the O-ring 35 is pressed against the inner surface of the outer plate 8. ing.
Also, a lubricant such as grease is filled between one annular seal member 32 and the other annular seal member 34.

The annular convex portion 32a of one annular seal member 32 is fitted into the annular concave groove 34b of the other annular seal member 34. Similarly, the annular convex portion 34a of the other annular seal member 34 is The annular seal member 32 is fitted in the annular concave groove 32b.
Then, due to the elasticity of the pair of annular seal members 32, 34 and the repulsive force of the elastic deformation of the O-rings 33, 35, the tip ends of the annular protrusions 32a, 34a abut against the bottoms of the annular grooves 32b, 34b. Touching.

  And when each annular convex part 32a, 34a fits in each annular concave groove 32b, the airtight space 36 is formed between each annular convex part 32a, 34a and the surface where a pair of annular seal members 32, 34 oppose. Is done.

Further, an outer annular seal member 37 made of a rigid body is disposed on the outer peripheral side of the pair of annular seal members 32 and 34.
The outer annular seal member 37 is preferably made of steel, for example.
A gap is provided between the outer peripheral surface of the pair of annular seal members 32 and 34 and the inner peripheral surface of the outer annular seal member 37, and the gap is also filled with a lubricant such as grease.
A gap is provided between both end surfaces of the outer annular seal member 37 and the outer surface of the inner plate 4 and the inner surface of the outer plate 8 so as to cope with a change in the distance between the inner plate 4 and the outer plate 8. ing.

Since the seal chain 1 shown in FIG. 4 is configured as described above, when the seal chain 1 is bent, one annular seal member 32 that abuts via the O-ring 33 rotates together with the inner plate 4. The other annular seal member 34 that abuts via the O-ring 35 rotates together with the outer plate 8.
Therefore, when the seal chain 1 is bent, the annular convex portion 32 a of one annular seal member 32 slides in the fitting portion of the annular concave groove 34 b of the other annular seal member 34, and the other annular seal member 34 The annular convex portion 34 a slides at the fitting portion of the annular concave groove 32 b of one annular seal member 32.
The O-rings 33 and 35 only abut against the inner plate 4 or the outer plate 8, respectively, and do not slide with respect to the outer surface of the inner plate 4 or the inner surface of the outer plate 8.
Therefore, since the inner plate 4 and the outer plate 8 can be used in a state in which shot blasting is performed, the cost can be reduced by that amount without requiring special processing.

Further, when the annular convex portions 32a, 34a of the pair of annular seal members 32, 34 are fitted into the corresponding annular concave grooves 32b, 34b, the peripheral surfaces of the plurality of annular convex portions 32a, 34a and the pair of annular seals. Since the compressed air exists in the sealed space 36 formed between the annular convex portions 32a and 34a of the member and the opposing surfaces except for the annular concave portions 32b and 34b, one annular seal member is formed by the compressed air. 32 and the other annular seal member 34 are pressed against the inner plate 4 and the outer plate 8, respectively.
Thereby, the contact pressure of the bottom part of the cyclic | annular concave grooves 32b and 34b corresponding to the front-end | tip part of the cyclic | annular convex parts 32a and 34a can be suppressed low, and abrasion of the front-end | tip part of the cyclic | annular convex parts 32a and 34a can be suppressed. .

  In addition, since the pair of annular seal members 32 and 34 can be either the elastic member or the rigid member, the same material can be used to prevent the wear from being accelerated.

Further, since the O-ring 33 is in contact with the outer surface of the inner plate 4 due to elastic deformation, leakage of a lubricant such as grease from between the one annular seal member 32 and the inner plate 4 and intrusion of dust from the outside are prevented. To prevent.
Similarly, since the O-ring 35 is in contact with the inner surface of the outer plate 8 due to elastic deformation, leakage of a lubricant such as grease from between the other annular seal member 34 and the outer plate 8 and intrusion of dust from the outside. To prevent.

  Further, by utilizing the repulsive force of the elastic deformation of the O-rings 33 and 35 and the elasticity of the pair of annular seal members 32 and 34, the tip portions of the annular convex portions 32a and 34a are respectively formed on the bottom portions of the annular concave grooves 34b and 32b. By abutting, the sealing effect can be enhanced and the change in the distance between the inner plate 4 and the outer plate 8 can be followed.

Further, the O-rings 33 and 35 are only subjected to compressive deformation and do not slide with the inner plate 4 or the outer plate 8, so that the function is not deteriorated due to sliding friction.
Therefore, the life of the O-rings 33 and 35 can be extended.

  Further, since a lubricant such as grease is filled between the pair of annular seal members 32, 34, wear of the fitting portions of the annular convex portions 32a, 34a and the annular concave grooves 32b, 34b can be reduced. The lifetime of the annular sealing members 32 and 34 can be extended.

  Further, since the outer annular seal member 37 is disposed on the outer peripheral side of the pair of annular seal members 32, 34, the outer annular seal member 37 has the same effect as the outer annular seal member 17 in the first embodiment.

Next, a seal chain that is Embodiment 4 of the present invention will be described with reference to FIG.
FIG. 5 is an enlarged cross-sectional view of the main part in the elliptical frame in FIG. 1 of the seal chain that is Embodiment 4 of the present invention.

  For the seal chain 1 which is the fourth embodiment of the present invention, only the sealing means 41 described later is different from the seal chain 1 of the first embodiment described above. The description about the overlapping part is omitted, and only the different sealing means 41 will be described below.

As shown in FIG. 5, the seal chain 1 of the fourth embodiment has a sealing means 41 interposed between the opposed surfaces of the inner plate 4 and the outer plate 8.
The sealing means 41 prevents the lubricant such as grease sealed in the bearing portion 9 constituted by the inner peripheral surface of the bush 3 and the outer peripheral surface of the pin 7 from leaking to the outside and Prevents dust from entering from the outside.

The sealing means 41 includes a pair of annular seal members 42, 44 disposed opposite to each other between the opposed surfaces of the inner plate 4 and the outer plate 8, and an intermediate disposed between the pair of annular seal members 42, 44. And an annular seal member 46.
Each of the pair of annular seal members 42 and 44 is formed of a bullet body.
In this embodiment, a polyurethane resin is used as the elastic body.
However, the pair of annular seal members 42 and 44 need not be elastic bodies, and may be rigid bodies.
Steel is used as the stiffness.
The intermediate annular seal member 46 is made of an elastic body. In this embodiment, the elastic body constituting the intermediate annular seal member 46 also uses polyurethane resin.
Both ends of the bush 3 protrude outward from the outer surface of each inner plate 4, and the pair of annular seal members 42 and 44 are disposed on the outer diameter side of the protruding portion of the bush 3.
Further, the sealing means 41 has an outer annular seal member 47 made of a rigid body disposed on the outer peripheral side of the pair of annular seal members 42 and 44.

One annular seal member 42 of the pair of annular seal members 42 and 44 is disposed to face the outer surface of the inner plate 4.
The one annular seal member 42 has an annular recess 42 b formed on the surface facing the other annular seal member 44.
Further, the one annular seal member 42 is formed with two annular grooves 42 c on the surface facing the outer surface of the inner plate 4.
An O-ring (elastic seal member) 43 is fitted in the annular grooves 42c.
Therefore, when one annular seal member 42 is assembled between the opposite surfaces of the inner plate 4 and the outer plate 8 together with the other annular seal member 44, the O-ring 43 is pressed against the outer surface of the inner plate 4. ing.

The other annular seal member 44 of the pair of annular seal members 42 and 44 is disposed to face the inner surface of the outer plate 8.
The other annular seal member 44 has an annular recess 44 b formed on the surface facing the one annular seal member 42 so as to face the annular recess 42 b of the one annular seal member 42.
Further, the other annular seal member 44 is formed with two annular grooves 44 c on the surface facing the inner surface of the outer plate 8.
An O-ring (elastic seal member) 45 is fitted into the annular grooves 44c.
Therefore, when the other annular seal member 44 is incorporated between the opposing surfaces of the inner plate 4 and the outer plate 8 together with the one annular seal member 42, the O-ring 35 is pressed against the inner surface of the outer plate 8. ing.
Also, a lubricant such as grease is filled between the one annular seal member 42 and the other annular seal member 44.

The intermediate annular seal member 46 made of an elastic body is fitted into both the annular recess 42 b of one annular seal member 42 and the annular recess 44 b of the other annular seal member 44.
Then, due to the elasticity of the pair of annular seal members 42 and 44, the elasticity of the intermediate annular seal member 46 made of an elastic body, and the repulsive force of the elastic deformation of the O-rings 43 and 45, the intermediate annular seal member 46 becomes a pair of annular seal members. 42 and 44 are in contact with the bottoms of the annular concave grooves 42b and 44b.

Further, an outer annular seal member 47 made of a rigid body is disposed on the outer peripheral side of the pair of annular seal members 42 and 44.
The outer annular seal member 47 is preferably made of steel, for example.
A gap is provided between the outer peripheral surface of the pair of annular seal members 42 and 44 and the inner peripheral surface of the outer annular seal member 47, and the gap is also filled with a lubricant such as grease.
A gap is provided between the both end surfaces of the outer annular seal member 47 and the outer surface of the inner plate 4 and the inner surface of the outer plate 8 so as to cope with a change in the distance between the inner plate 4 and the outer plate 8. ing.

Since the seal chain 1 shown in FIG. 5 is configured as described above, when the seal chain 1 is bent, one annular seal member 42 that comes into contact with the O-ring 43 rotates together with the inner plate 4. The other annular seal member 44 that abuts via the O-ring 45 rotates together with the outer plate 8.
Therefore, when the seal chain 1 is bent, the pair of annular seal members 42 and 44 slide at the fitting portions of the intermediate annular seal member 46 and the annular concave grooves 42b and 44b.
The O-rings 43 and 45 only abut against the inner plate 4 or the outer plate 8, respectively, and do not slide with respect to the outer surface of the inner plate 4 or the inner surface of the outer plate 8.
Therefore, since the inner plate 4 and the outer plate 8 can be used in a state in which shot blasting is performed, the cost can be reduced by that amount without requiring special processing.

The pair of annular seal members 42 and 44 may be either an elastic body or a rigid body, but the intermediate annular seal member 46 is an elastic body. Similarly, it is preferable that the pair of sliding annular seal members 42 and 44 use elastic bodies.
Thereby, promotion of sliding wear by the same material can be prevented.

Further, since the O-ring 43 is in contact with the outer surface of the inner plate 4 due to elastic deformation, leakage of a lubricant such as grease from between the one annular seal member 42 and the inner plate 4 and entry of dust from the outside are prevented. To prevent.
Similarly, since the O-ring 45 is in contact with the inner surface of the outer plate 8 due to elastic deformation, leakage of lubricant such as grease from the other annular seal member 44 and the outer plate 8 and intrusion of dust from the outside. To prevent.

  Further, by utilizing the repulsive force of the elastic deformation of the O-rings 43 and 45 and the elasticity of the pair of annular seal members 42 and 44, the intermediate annular seal member 46 comes into contact with the bottoms of the annular concave grooves 44b and 42b, respectively. In addition, the sealing effect can be enhanced and the change in the distance between the inner plate 4 and the outer plate 8 can be followed.

In addition, the O-rings 43 and 45 only undergo compressive deformation and do not slide with the inner plate 4 or the outer plate 8, and therefore do not cause functional degradation due to sliding friction.
Therefore, the lifetime of the O-rings 43 and 45 can be extended.

  Further, since a lubricant such as grease is filled between the pair of annular seal members 42, 44, wear of the fitting portion between the intermediate annular seal member 46 and the annular concave grooves 42b, 44b can be reduced. The lifetime of the sealing members 42 and 44 can be extended.

  In addition, since the outer annular seal member 47 is disposed on the outer peripheral side of the pair of annular seal members 42 and 44, the outer annular seal member 47 has the same effect as the outer annular seal member 17 of the first embodiment.

  In addition, although the polyurethane resin is used as the elastic body of the pair of annular seal members in the above-described embodiments 1, 2, 3, and 4, the material is not limited to the polyurethane resin, and any other material may be used as long as it is an elastic body. Can also be used.

  In the case where the pair of annular seal members 32 and 34 in the third embodiment and the pair of annular seal members 42 and 44 in the fourth embodiment are made of a rigid body, they are not limited to steel. For example, Synthetic resins, sintered oil-impregnated alloys, bronze, phosphor bronze, bronze steel, and the like can also be used.

  In addition, although Example 1, 2, 3, 4 mentioned above showed the example applied to the roller chain, this invention is applicable also to the bush chain which does not have a roller.

The top view of the partial cross section of the seal chain to which this invention is applied. Sectional drawing which expanded the principal part in the elliptical frame in FIG. 1 of the seal chain which is Example 1 of this invention. Sectional drawing which expanded the principal part in the elliptical frame in FIG. 1 of the seal chain which is Example 2 of this invention. Sectional drawing which expanded the principal part in the elliptical frame in FIG. 1 of the seal chain which is Example 3 of this invention. Sectional drawing which expanded the principal part in the elliptical frame in FIG. 1 of the seal chain which is Example 4 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Seal chain 2 ... Inner link 3 ... Bush 4 ... Inner plate 5 ... Roller 6 ... Outer link 7 ... Pin 8 ... Outer plate 9 ... Bearing Part 10 ... Retaining pin 11, 21, 31, 41 ... Sealing means 12, 22, 32, 42 ... One annular seal member 12a, 22a ... Annular lip-shaped convex part 32a -Annular convex parts 12b, 22b, 32b, 42b ... Annular concave parts 12c, 34c, 42c ... Annular grooves 13, 33, 43 ... O-rings (elastic seal members)
14, 24, 34, 44 ... the other annular seal member 14a, 24a ... annular lip-shaped convex part 34a ... annular convex part 14b, 24b, 34b, 44b ... annular concave part 14c, 34c, 44c ... annular grooves 15, 35, 45 ... O-ring (elastic seal member)
36 ・ ・ ・ Sealed space 46 ・ ・ ・ Intermediate annular seal member 17, 27, 37, 47 ・ ・ ・ Outer annular seal member

Claims (5)

In a seal chain in which a sealing means is interposed between the opposing surfaces of the inner plate and the outer plate,
The sealing means has a pair of annular seal members disposed opposite to each other between the opposed surfaces of the inner plate and the outer plate, and the pair of annular seal members are made of an elastic body, and the pair of annular seals The member has an annular lip-shaped convex part and an annular concave part into which the annular lip-shaped convex part fits on the surfaces facing each other, and the tip of the annular lip-shaped convex part is located at the bottom of the annular concave part. A seal chain, wherein the annular seal member is pressed and brought into contact with elasticity, and the tip portion of the annular lip-shaped convex portion and the bottom portion of the annular concave portion slide when the seal chain is bent.   2. The pair of annular seal members according to claim 1, wherein elastic seal members are mounted on surfaces facing the inner plate or the outer plate, respectively, and the elastic seal members abut against the inner plate or the outer plate. Seal chain. In a seal chain in which a sealing means is interposed between the opposing surfaces of the inner plate and the outer plate,
The sealing means has a pair of annular seal members disposed opposite to each other between the opposed surfaces of the inner plate and the outer plate, and the pair of annular seal members are concentrically arranged on the opposed surfaces. An annular convex portion and a plurality of annular concave portions into which the annular convex portions are respectively fitted, and the peripheral surfaces of the plurality of annular convex portions and the opposed surfaces except for the annular convex portion and the annular concave portion of the pair of annular seal members And the pair of annular seal members are each provided with an elastic seal member on a surface facing the inner plate or the outer plate, and the elastic seal member is the inner plate or the outer plate. And the pair of annular seal members slide on a fitting surface between the annular convex portion and the annular concave portion when the seal chain is bent. In a seal chain in which a sealing means is interposed between the opposing surfaces of the inner plate and the outer plate,
The sealing means includes a pair of annular seal members disposed opposite to each other between opposing surfaces of the inner plate and the outer plate, and an intermediate annular seal member formed of an elastic body disposed between the pair of annular seal members. The pair of annular seal members have annular recesses on opposite surfaces, the intermediate annular seal member fits into both of the annular recesses, and the pair of annular seal members includes the inner plate or Elastic seal members are respectively mounted on the surfaces facing the outer plate, the elastic seal members abut against the inner plate or the outer plate, and the pair of annular seal members are annular with the intermediate annular seal member when the seal chain is bent. A seal chain that slides on the fitting surface of the recess.   The seal chain according to any one of claims 1 to 4, wherein the seal means includes an outer annular seal member made of a rigid body disposed on an outer peripheral side of the pair of annular seal members.

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