JP2008089032A - Long life chain - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a long life chain capable of preventing leakage of lubricating oil and intrusion of dust and reducing abrasion between rollers and bushes with the rollers smoothly rolling, having small number of parts, and simple manufacturing load and disassembly and assembly operation load. <P>SOLUTION: The long life chain 100 is provided with a pair of inner plates 110, a pair of bushes 120 press-fit to the inner plates 110, rollers 130 externally fit to the bushes 120, a pair of connecting pins 140 inserted in the bushes 130 and a pair of outer plates 150 for press-fitting pin holes 151 to both ends of the connecting pins 140 and connecting the inner plates 110. In the long life chain 100, lubricating oil is enclosed between the rollers 130 and the bush 120, rotation shafts 132 formed to protrude from the roller 130 to the inner plate 110 are respectively supported by roller bearing parts 113 formed by counter boring an inside surface of the inner plate 110 in an enlarged-diameter state coaxial with a bush press-in hole 111. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a long-life chain used for a conveyor belt chain, a transmission roller chain, and the like, and is particularly press-fitted into a pair of left and right inner plates and a bush press-fitting hole of the inner plate. A pair of front and rear bushes, a pair of front and rear rollers rotatably fitted on the bush, a pair of front and rear connection pins rotatably inserted into the bush, and both ends of the connection pins are press-fitted into the pin holes. The present invention relates to a long-life chain that includes a pair of left and right outer plates that connect the inner plate in the longitudinal direction of the chain, and in which lubricating oil is sealed between the inner peripheral surface of the roller and the outer peripheral surface of the bush.

An outer link in which both ends of a pair of outer link plates are connected by pins and an inner link in which both ends of a pair of inner link plates are connected by bushes and a roller is fitted to the bushes are inserted into the bushes. Thus, there is known a seal chain provided with a sealing means that is alternately connected and seals the lubricating oil sealed between the bush and the roller. The sealing means of the seal chain includes a recess formed on the inner surface of the inner link plate so as to surround the bush, a ring-shaped seal plate loosely fitted to both ends of the roller, and the recess. And a seal ring made of an elastic body disposed between the seal plate and the seal plate (see, for example, Patent Document 1).
Japanese Patent Laying-Open No. 2005-282813 (page 7, FIG. 4)

  In the conventional seal chain as described above, the seal ring and the seal plate are disposed in order to maintain the sealing effect of the lubricating oil injected between the roller and the bush by sealing between the roller and the inner link plate. It is arranged in a pressed state between the recess formed on the inner surface of the link plate and the roller, and the pressing force in such a pressed state increases the relative rotational resistance between the roller and the inner link plate, There was a problem that the roller did not roll smoothly during chain operation.

  Further, in order to prevent a reduction in the sealing effect caused by the ring member and the elastic seal ring being in sliding contact with the inner link plate, the roller, etc., the inner surface of the inner link plate in contact with the seal ring and the seal plate Therefore, there is a problem that it is necessary to perform surface finishing to reduce the surface roughness of the end face of the roller, which increases the processing load of the surface finishing.

  Since the seal ring and seal plate as sealing means are provided between the recess and the roller formed on the inner surface of the inner link plate, which is a basic chain component, the number of parts of the chain and the number of assembly steps There was a problem that the assembly of the chain deteriorated.

  Therefore, the present invention solves the conventional problem, that is, the object of the present invention is to prevent leakage of lubricating oil enclosed between the roller and the bush during chain operation and intrusion of external dust. In addition, sliding wear between the inner peripheral surface of the roller and the outer peripheral surface of the bush can be reduced, and sliding noise and seizure generated between the roller and the bush can be prevented, and the roller can smoothly roll. In addition, it is to provide a long-life chain with a small number of parts of the chain and a simple chain manufacturing burden and a disassembly and assembly work burden such as chain cutting.

  According to the first aspect of the present invention, a pair of left and right inner plates, a pair of front and rear bushes press-fitted into a bush press-fitting hole of the inner plate, and a front and rear fitted rotatably to the bush A pair of rollers, a pair of front and rear connecting pins inserted rotatably in the bush, and a pair of left and right outer plates connecting the inner plate in the longitudinal direction of the chain by press-fitting pin holes into both ends of the connecting pins. A labyrinth structure is formed between the inner surface of the inner plate and the end surface of the roller in a long-life chain in which lubricating oil is sealed between the inner peripheral surface of the roller and the outer peripheral surface of the bush. This solves the above-mentioned problems.

  According to a second aspect of the present invention, a pair of left and right inner plates, a pair of front and rear bushes press-fitted into a bushing press-fitting hole of the inner plate, and front and rear ends rotatably fitted to the bushes A pair of rollers, a pair of front and rear connecting pins inserted rotatably in the bush, and a pair of left and right outer plates connecting the inner plate in the longitudinal direction of the chain by press-fitting pin holes into both ends of the connecting pins. A long-life chain in which lubricating oil is sealed between an inner peripheral surface of the roller and an outer peripheral surface of the bush, and a rotation shaft formed to project from both end surfaces of the roller toward the inner plate includes the inner plate The above-mentioned problems are solved by supporting the inner surface of each of the roller bearings in such a manner that they are countersunk in a diameter-enlarged state coaxial with the bush press-fitting hole.

  According to a third aspect of the present invention, in addition to the configuration of the second aspect, an oil reservoir groove for supplying a lubricant between the inner peripheral surface of the roller and the outer peripheral surface of the bush is formed on the outer peripheral surface of the bush. By being engraved, the above-described problems are further solved.

According to a fourth aspect of the present invention, in addition to the configuration of the second or third aspect, the inner diameter D ₁ of the roller bearing portion, the outer diameter D ₂ of the rotating shaft, the inner diameter D _{3 of} the roller, and the outer diameter of the bush D ₄ is formed so as to satisfy D ₁ -D ₂ > D ₃ -D ₄ , thereby further solving the above-described problems.

According to a fifth aspect of the present invention, in addition to the configuration according to any one of the second to fourth aspects, the depth H ₁ of the roller bearing portion and the protrusion amount H _{2 of the} rotating shaft are such that H ₁ <H ₂ , the roller bearing portion depth H ₁ , the rotation amount H ₂ of the rotating shaft, the distance H ₃ between the pair of left and right inner plates, and the roller width H ₄ are H _1. Each of the above-described problems is further solved by forming each so as to satisfy + H ₃ <H ₄ + 2H ₂ <2H ₁ + H ₃ .

  Accordingly, the present invention provides a pair of left and right inner plates, a pair of front and rear bushes press-fitted into a bush press-fit hole of the inner plate, and a pair of front and rear rollers and bushes that are rotatably fitted to the bushes. A pair of front and rear connecting pins that are rotatably inserted into the inside, and a pair of left and right outer plates that press-fit pin holes into both ends of the connecting pins and connect the inner plate in the longitudinal direction of the chain. By sealing the lubricating oil between the bush and the outer peripheral surface of the bush, it is possible not only to drive the chain for a long period of time without lubrication from the outside, but also to exhibit the following specific effects .

  According to the long-life chain of the present invention according to claim 1, since the labyrinth structure is formed between the inner surface of the inner plate and the end surface of the roller, such a labyrinth structure can Since the leakage of the lubricating oil enclosed between the inner peripheral surface of the roller and the outer peripheral surface of the bush due to the centrifugal force, etc. caused by traveling is suppressed and the entry of external dust is suppressed, the inner peripheral surface of the roller and the bush The sliding wear of the outer peripheral surface of the roller is reduced, the sliding noise and seizure that occur between the roller and bushing can be prevented, and the roller meshes while smoothly rolling when meshing with the sprocket. Can be prevented.

  According to the long-life chain of the present invention according to claim 2, the rotating shaft that protrudes from both end faces of the roller toward the inner plate has a counterbore with the inner side surface of the inner plate coaxially expanded with the bushing press-fit hole. The labyrinth structure formed between the outer surface of the rotating shaft and the inner surface of the roller bearing portion is supported by the roller bearing portions formed as described above. As a result, the leakage of the lubricating oil enclosed between the roller and the bush caused by the above is suppressed and the intrusion of external dust is suppressed, so that the sliding wear between the inner peripheral surface of the roller and the outer peripheral surface of the bush is reduced. The sliding noise and seizure generated with the bush can be prevented, and the roller can be engaged while smoothly rolling when meshing with the sprocket, so that wear of the chain can be prevented.

Also, a seal member arranged in a pressed state between the inner surface of the inner link plate and the end surface of the roller, such as a conventional seal chain, is provided as a separate member between the inner surface of the inner plate and the end surface of the roller. Therefore, the rolling resistance of the roller is small, the roller smoothly meshes with the sprocket while the chain is operating, and the number of parts of the chain is small, so that disassembly and assembly work such as chain cut-off is easy.
In addition, in the conventional seal chain, in order to prevent sliding contact wear of the seal member and maintain the sealing performance of the lubricating oil, surface finishing processing is performed to reduce the surface roughness on the inner surface of the inner link plate and the end surface of the roller. However, in the long-life chain of the present invention, it is not necessary to perform surface finishing as in the conventional case, and the manufacturing burden of the chain can be reduced.

  According to the long-life chain of the present invention according to claim 3, in addition to the effect produced by the long-life chain according to claim 2, oil for supplying a lubricant between the inner peripheral surface of the roller and the outer peripheral surface of the bush Since the reservoir groove is engraved on the outer peripheral surface of the bush, more lubricating oil can be enclosed, and the lubricating oil is continuously supplied between the inner peripheral surface of the roller and the outer peripheral surface of the bush. As a result, sliding wear between the inner surface of the roller and the outer surface of the bush can be reduced over a long period of time, and sliding noise and seizure generated between the roller and the bush can be prevented. Since the rollers mesh with each other while rolling smoothly, wear of the chain can be prevented.

According to the long-life chain of the present invention according to claim 4, in addition to the effect produced by the long-life chain according to claim 2 or claim 3, the inner diameter D ₁ of the roller bearing portion and the outer diameter D _{2 of the} rotating shaft. , the outer diameter _{D 4} of the internal diameter _{D 3} and bushing _roller, by being formed respectively so as to satisfy _{D 1 -D 2> D 3 -D} 4, offset to the chain advancing direction roller relative to the bushing In this case, even if the inner peripheral surface of the roller and the outer peripheral surface of the bush come into contact with each other and the lubricating oil is not sufficiently supplied, the outer peripheral surface of the rotating shaft and the inner peripheral surface of the roller bearing portion are not Completely prevent contact with each other.
As a result, wear powder caused by sliding contact between the outer peripheral surface of the rotating shaft and the inner peripheral surface of the roller bearing portion enters between the connecting pin and the bush, and such wear powder serves as an abrasive to the roller. Abnormal wear damage that tends to occur with the bushing can be prevented.

According to long life chain of the present invention according to claim 5, in addition to the effect long life chain according to any one of claims 2 to 4, the roller bearing unit depth H ₁ and the rotational axis The protrusion H ₂ is formed so as to satisfy H ₁ <H ₂ , so that the roller is skewed, swung or offset in the chain width direction with respect to the inner plate during chain operation. However, since the end surface of the rotating shaft having a small sliding area and the bottom surface of the roller bearing portion are in contact with each other, the inner surface of the inner plate having a large sliding area and the end surface of the roller are completely prevented from contacting each other. The roller rolling resistance is small, and the roller meshes with the sprocket while rolling smoothly during chain operation, so that the chain can be prevented from being worn.

Further, the depth H ₁ of the roller bearing portion, the protrusion amount H ₂ of the rotating shaft, the distance H ₃ between the pair of left and right inner plates, and the width H _{4 of the} roller are H ₁ + H ₃ <H ₄ + 2H ₂ <2H ₁ + H _3. Are formed so that the roller is skewed, swung or displaced in the chain width direction with respect to the inner plate when the chain is in operation. This prevents the lubricant enclosed between the roller and bushing from leaking and prevents external dust from entering during chain operation, and reduces sliding wear between the outer peripheral surface of the bush and the inner peripheral surface of the roller. In addition, sliding noise and seizure that occur between the roller and bushing can be prevented, and the roller meshes while smoothly rolling when meshing with the sprocket, preventing chain wear. Kill.

  The present invention includes a pair of left and right inner plates, a pair of front and rear bushes press-fitted into a bush press-fitting hole of the inner plate, a pair of front and rear rollers rotatably fitted on the bush, and the inside of the bush A pair of front and rear connecting pins that are rotatably inserted into the pin hole, and a pair of left and right outer plates that press-fit and fit both ends of the connecting pin into the pin holes to connect the inner plate in the longitudinal direction of the chain, In a long-life chain in which lubricating oil is sealed between the inner peripheral surface of the roller and the outer peripheral surface of the bush, a rotary shaft that is coaxial and has a small diameter with the roller that protrudes from both end surfaces of the roller toward the inner plate, Lubricating oil that is supported between roller bearings each having an inner surface of the inner plate that is countersunk in a diameter-enlarged state coaxial with the bushing press-fit hole, and is sealed between the roller and the bush when the chain is in operation Prevents leakage and external dust intrusion, reduces sliding wear between the inner peripheral surface of the roller and the outer peripheral surface of the bush, and prevents sliding noise and seizure generated between the roller and the bush. As long as the roller rolls smoothly, and the number of parts of the chain is small and the chain manufacturing burden and chain disassembly and assembly work burden are simple, the specific embodiment is not limited. It doesn't matter if it exists.

  In addition, the specific shape of the oil sump groove in the present invention may be either a D-cut groove or an annular groove provided around the outer peripheral surface of the bush. In this case, a large amount of lubricating oil can be enclosed while maintaining the strength of the bush, which is more preferable.

In addition, the specific shape of the roller bearing portion in the present invention may be any of a circular concave groove and a polygonal concave groove.
And as for the specific shape of the rotating shaft in the present invention, it may be any one in which the outer peripheral surface is formed in a circular shape, or the outer peripheral surface is formed in a polygonal shape.

Hereinafter, the long-life chain 100 which is 1st Example of this invention is demonstrated based on drawing.
Here, FIG. 1 is an overall schematic view in which a part of the long-life chain according to the first embodiment of the present invention is cut out, and FIG. 2 is a perspective view showing a connected state of the long-life chain shown in FIG. 3 is a cross-sectional view in which the long-life chain shown in FIG. 1 is partially enlarged, FIG. 4 is an assembly dimension diagram of the long-life chain shown in FIG. 1, and FIG. FIG. 6 is a dimensional diagram showing a state in which the rollers of the long-life chain are displaced in the chain traveling direction, and FIG. 6 is a dimensional diagram showing a state in which the rollers of the long-life chain in FIG. 1 are displaced in the chain width direction.

First, as shown in FIGS. 1 and 3, the long-life chain 100 according to the first embodiment of the present invention includes inner plates 110 and 110 that are spaced apart from each other and bushing press-fitting holes 111 of the inner plate 110. A pair of front and rear bushes 120 that are press-fitted, a pair of front and rear rollers 130 that are rotatably fitted to the bush 120, a pair of front and rear connection pins 140 that are rotatably inserted into the bush 120, and a connection pin 140, a pair of left and right outer plates 150 that are press-fitted and fitted into pin holes 151 to connect the inner plate 110 in the longitudinal direction of the chain.
Further, lubricating oil is sealed between the inner peripheral surface 131 of the roller 130 and the outer peripheral surface 121 of the bush 120.

Therefore, specific forms of the roller 130 and the inner plate 110, which are the most characteristic features of the long-life chain 100 of this embodiment, will be described in detail with reference to FIGS.
First, as shown in FIGS. 2 and 3, the inner surface 112 of the inner plate 110 has two roller bearing portions 113 formed by countersunk in a diameter-enlarged state coaxial with the two bush press-fitting holes 111, 111, 113 is provided. The both end surfaces 131 of the roller 130 are provided with rotating shafts 132 that are coaxial and have a small diameter and are supported by the roller bearing portions 113, respectively, in a protruding manner toward the inner plate 110.

Further, as shown in FIG. 4, the long-life chain 100 has an inner diameter D ₁ of the roller bearing portion 113, an outer diameter D ₂ of the rotating shaft 132, an inner diameter D _{3 of the} roller 130, and an outer diameter D _{4 of the} bush 120. _1- D ₂ > D ₃ -D ₄ is satisfied.
Then, the projecting amount of _{H 2} depth _{H 1} and the rotation shaft 132 of the roller bearing unit _113, are formed so as to satisfy _H 1 <H _2.
The depth H ₁ of the roller bearing portion 113, the protrusion amount H ₂ of the rotating shaft 132, the distance H ₃ between the pair of left and right inner plates 110, and the width H _{4 of the} roller 130 are H ₁ + H ₃ <H ₄ + 2H ₂ < Each is formed so as to satisfy 2H ₁ + H ₃ .

The long-life chain 100 of the present embodiment obtained in this way has a rotating shaft 132 that is coaxial and small in diameter with the roller 130 projecting from both end faces of the roller 130 toward the inner plate 110. 112 are respectively supported by roller bearing portions 113 formed by facing the bush press-fitting hole 111 in a diameter-enlarged state.
Thus, the labyrinth structure L _1, which is formed between the inner surface of the outer surface and the roller bearing unit 113 of such a rotation shaft 132, the roller 130 and the bushing 120 due to centrifugal force, etc. caused by the orbiting running when the chain is running In addition, the leakage of the lubricating oil enclosed between the inner and outer surfaces of the roller 130 and the outer surface 121 of the bush 120 is reduced, so that the sliding wear of the inner surface 133 of the roller 130 and the outer surface 121 of the bush 120 is reduced. In addition, the sliding noise and seizure generated between the roller 130 and the sprocket (not shown) can be prevented, and the roller 130 meshes while smoothly rolling, so that wear of the chain can be prevented.

Further, the long-life chain 100 is pressed between the inner surface 112 of the inner plate 110 and the end surface 131 of the roller 130 between the inner surface of the inner link plate and the end surface of the roller, such as a conventional seal chain. The sealing member arranged in is not provided as a separate member.
Therefore, the rolling resistance of the roller 130 is small, and the roller 130 meshes with the sprocket while rolling smoothly when the chain is in operation, and the number of parts of the chain is small, and disassembly and assembling work such as chain cut-off is easy.
In the conventional seal chain, in order to prevent sliding contact wear of the seal member and maintain the sealing performance of the lubricating oil, surface finishing processing is performed to reduce the surface roughness on the inner surface of the inner link plate and the end surface of the roller. However, in the long-life chain 100 of the present invention, it is not necessary to perform surface finishing as in the conventional case, and the manufacturing burden of the chain can be reduced.

Further, the inner diameter D ₁ of the roller bearing portion 113, the outer diameter D ₂ of the rotating shaft 132, the inner diameter D _{3 of the} roller 130, and the outer diameter D _{4 of the} bush 120 satisfy D ₁ −D ₂ > D ₃ −D ₄ . Are formed respectively.
Therefore, as shown in FIG. 5, when the roller 130 is offset in the chain traveling direction with respect to the bush 120, the inner peripheral surface 133 of the roller 130 and the outer peripheral surface 121 of the bush 120 come into contact with each other, and the lubricating oil is sufficient. Even if not supplied to the outer peripheral surface, the outer peripheral surface 132a of the rotating shaft 132 and the inner peripheral surface 113a of the roller bearing portion 113 are completely prevented from contacting each other.
As a result, wear powder resulting from sliding contact between the outer peripheral surface 132a of the rotating shaft 132 and the inner peripheral surface 113a of the roller bearing portion 113 enters between the connecting pin 140 and the bush 120, and such wear powder is generated. As an abrasive, abnormal wear damage that tends to occur between the roller 130 and the bush 120 can be prevented.

Then, the projecting amount of _{H 2} depth _{H 1} and the rotation shaft 132 of the roller bearing unit _113, are formed so as to satisfy _H 1 <H _2.
Therefore, as shown in FIG. 6, even when the roller 130 is skewed, swung, or offset in the chain width direction with respect to the inner plate 110 during the chain operation, the end surface of the rotating shaft 132 with a small sliding area 132b and the bottom surface 113b of the roller bearing portion 113 come into contact with each other and completely prevent the inner surface 112 of the inner plate 110 having a large sliding area and the end surface 131 of the roller 130 from coming into contact with each other. Since the dynamic resistance is small and the roller 130 meshes with the sprocket while rolling smoothly when the chain is in operation, wear of the chain can be prevented.

Further, the depth H ₁ of the roller bearing 113, the protrusion amount H ₂ of the rotating shaft 132, the distance H ₃ between the pair of left and right inner plates 110, and the width H _{4 of the} roller 130 are H ₁ + H ₃ <H ₄ + 2H ₂ < Each is formed so as to satisfy 2H ₁ + H ₃ .
Therefore, as shown in FIG. 6, even when the roller 130 is skewed, oscillated, or offset in the chain width direction with respect to the inner plate 110 when the chain is operating, the rotating shaft 132 is the roller bearing portion. 113, the leakage of the lubricating oil enclosed between the roller 130 and the bush 120 during operation of the chain and the entry of external dust can be prevented, and the outer peripheral surface 121 of the bush 120 and the inner peripheral surface 133 of the roller 130 can be prevented. The sliding wear of the roller 130 and the bush 120 can be prevented, and the sliding noise and seizure that occur between the roller 130 and the bush 120 can be prevented, and the roller 130 meshes while smoothly rolling when meshing with the sprocket. The effect is enormous.

Next, a long-life chain 200 according to a second embodiment of the present invention will be described with reference to FIGS.
First, as shown in FIGS. 7 and 8, the long-life chain 200 according to the second embodiment of the present invention includes inner plates 210, 210 that are spaced apart from each other and bushing press-fitting holes 211 of the inner plate 210. A pair of front and rear bushes 220 that are press-fitted and fitted, a pair of front and rear rollers 230 that are rotatably fitted to the bush 220, a pair of front and rear coupling pins 240 that are rotatably inserted into the bush 220, and a coupling pin A pair of left and right outer plates 250 that press-fit both ends of 240 into pin holes 251 and connect the inner plate 210 in the longitudinal direction of the chain are provided.
Further, lubricating oil is sealed between the inner peripheral surface 233 of the roller 230 and the outer peripheral surface 221 of the bush 220.

Therefore, specific forms of the roller 230, the inner plate 210, and the bushing 220, which are the most characteristic features of the long-life chain 200 of this embodiment, will be described in detail with reference to FIGS.
First, on the inner side surface 212 of the inner plate 210, two roller bearing portions 213 and 213 formed by counterbore processing in a diameter-enlarged state coaxial with the two bush press-fitting holes 211 and 211 are provided. Further, on both end surfaces 231 of the roller 230, a rotation shaft 232 having a coaxial and small diameter with the roller 230 protruding toward the inner plate 210 is provided and supported by the roller bearing portion 213.
Further, a D-cut oil sump groove 222 is formed on the outer peripheral surface of the bush 220.

Further, in the long-life chain 200, the inner diameter D ₁ of the roller bearing portion 213, the outer diameter D ₂ of the rotating shaft 232, the inner diameter D _{3 of the} roller 230, and the outer diameter D _{4 of the} bush 220 are D ₁ -D ₂ > D _3. It is formed so as to satisfy -D _4.
Then, the projecting amount of _{H 2} depth _{H 1} and the rotation shaft 232 of the roller bearing unit _213, are formed so as to satisfy _H 1 <H _2.
Then, the depth H ₁ of the roller bearing portion 213, the protruding amount H ₂ of the rotating shaft 232, the distance H ₃ between the pair of left and right inner plates 210, and the width H _{4 of the} roller 230 are H ₁ + H ₃ <H ₄ + 2H ₂ < Each is formed so as to satisfy 2H ₁ + H ₃ .

The long-life chain 200 of the present embodiment obtained in this way has a rotating shaft 232 that is coaxial and small in diameter with the roller 230 projecting from both end surfaces of the roller 230 toward the inner plate 210, and the inner surface of the inner plate 210. 212 are respectively supported by roller bearing portions 213 formed by facing the bush press-fitting hole 211 in a diameter-enlarged state.
Therefore, such a labyrinth structure L ₂ formed between the inner surface of the outer surface and the roller bearing 213 of the rotation shaft 232, the roller 230 and the bushing 220 due to centrifugal force, etc. caused by the orbiting running when the chain is running Since the leakage of the lubricating oil enclosed between the inner and outer surfaces of the roller 230 and the outer surface 221 of the bush 220 is reduced, the sliding wear of the inner surface 233 of the roller 230 and the outer surface 221 of the bush 220 is reduced. In addition, the sliding noise and seizure that occur between the roller 230 and the sprocket (not shown) can be prevented, and the roller 230 can be engaged while smoothly rolling, so that wear of the chain can be prevented.

The long-life chain 200 is pressed between the inner surface 212 of the inner plate 210 and the end surface 231 of the roller 230 between the inner surface of the inner link plate and the end surface of the roller, such as a conventional seal chain. The sealing member arranged in is not provided as a separate member.
Therefore, the rolling resistance of the roller 230 is small, and the roller 230 meshes with the sprocket while smoothly rolling when the chain is operating, and the number of parts of the chain is small, so that disassembly and assembling work such as chain cut-off is easy.
In the conventional seal chain, in order to prevent sliding contact wear of the seal member and maintain the sealing performance of the lubricating oil, surface finishing processing is performed to reduce the surface roughness on the inner surface of the inner link plate and the end surface of the roller. However, in the long-life chain 200 of the present invention, it is not necessary to perform the conventional surface finishing process, and the manufacturing burden of the chain can be reduced.

Further, an oil reservoir groove 222 for supplying a lubricant between the inner peripheral surface 233 of the roller 230 and the outer peripheral surface 221 of the bush 220 is carved on the outer peripheral surface 221 of the bush 220.
Accordingly, a larger amount of lubricating oil can be enclosed, and the lubricating oil can be continuously supplied between the inner peripheral surface 233 of the roller 230 and the outer peripheral surface 221 of the bush 220. The sliding wear of the outer peripheral surface 221 of the bushing 220 can be reduced over a long period of time, sliding noise and seizure occurring between the roller 230 and the bushing 220 can be prevented, and the roller 230 can be smoothly moved when engaged with the sprocket. Since they mesh while rolling, wear of the chain can be prevented.

Further, the inner diameter D ₁ of the roller bearing portion 213, the outer diameter D ₂ of the rotating shaft 232, the inner diameter D _{3 of the} roller 230, and the outer diameter D _{4 of the} bush 220 satisfy D ₁ −D ₂ > D ₃ −D ₄ . Are formed respectively.
Therefore, when the roller 230 is offset in the chain traveling direction with respect to the bush 220, the inner peripheral surface 233 of the roller 230 and the outer peripheral surface 221 of the bush 220 are in contact with each other, and the lubricating oil is not sufficiently supplied. Even in this case, the outer peripheral surface 232a of the rotating shaft 232 and the inner peripheral surface 213a of the roller bearing portion 213 are completely prevented from contacting each other.
As a result, wear powder caused by sliding contact between the outer peripheral surface 232a of the rotating shaft 232 and the inner peripheral surface 213a of the roller bearing portion 213 enters between the connecting pin 240 and the bush 220, and such wear powder is generated. As an abrasive, abnormal wear damage that tends to occur between the roller 230 and the bushing 220 can be prevented.

Then, the projecting amount of _{H 2} depth _{H 1} and the rotation shaft 232 of the roller bearing unit _213, are formed so as to satisfy _H 1 <H _2.
Therefore, even when the roller 230 is skewed, swung or offset in the chain width direction with respect to the inner plate 210 when the chain is in operation, the end surface 232b of the rotating shaft 232 having a small sliding area and the roller bearing portion 213 Since the bottom surface 213b comes into contact with each other and the inner surface 212 of the inner plate 210 having a large sliding area and the end surface 231 of the roller 230 are completely prevented from contacting each other, the rolling resistance of the roller 230 is small, and the chain is operated. Sometimes the roller 230 meshes with the sprocket while rolling smoothly, so that wear of the chain can be prevented.

Furthermore, the depth H ₁ of the roller bearing portion 213, the protrusion amount H ₂ of the rotating shaft 232, the distance H ₃ between the pair of left and right inner plates 210, and the width H _{4 of the} roller 230 are H ₁ + H ₃ <H ₄ + 2H ₂ < Each is formed so as to satisfy 2H ₁ + H ₃ .
Accordingly, even when the roller 230 is skewed, swung, or offset in the chain width direction with respect to the inner plate 210 during the chain operation, the rotating shaft 232 does not come off from the roller bearing portion 213. It is possible to prevent leakage of lubricating oil sealed between the roller 230 and the bushing 220 and intrusion of external dust during chain operation, and reduce sliding wear between the outer peripheral surface 221 of the bushing 220 and the inner peripheral surface 233 of the roller 230. In addition to preventing sliding noise and seizure generated between the roller 230 and the bushing 220, the roller 230 meshes while smoothly rolling when meshing with the sprocket, thereby preventing chain wear, etc. The effect is enormous.

BRIEF DESCRIPTION OF THE DRAWINGS The whole schematic diagram which notched a part of long-life chain which is 1st Example of this invention. The perspective view which shows the connection state of the long-life chain shown in FIG. FIG. 2 is a cross-sectional view in which the long-life chain shown in FIG. 1 is partially enlarged. FIG. 2 is an assembly dimension diagram of the long-life chain shown in FIG. 1. FIG. 2 is a dimensional diagram illustrating a state in which the long-life chain of FIG. 1 is pulled in the chain traveling direction. FIG. 2 is a dimensional diagram showing a state in which the long-life chain of FIG. 1 is offset in the chain width direction. The perspective view which shows the connection state of the long-life chain which is 2nd Example of this invention. FIG. 8 is a cross-sectional view in which the long-life chain shown in FIG. 7 is partially enlarged.

Explanation of symbols

100, 200 ... Long-life chain 110, 210 ... Inner plate 111, 211 ... Bush press-fit hole 112, 212 ... Inner side surface 113, 213 ... Roller bearing portion 113a, 213a ... Inside Peripheral surfaces 113b, 213b ... Bottom surface 120, 220 ... Bush 121, 221 ... Outer peripheral surface 130, 230 ... Rollers 131, 231 ... End surfaces 132, 232 ... Rotating shafts 132a, 232a Outer surface 132b, 132b ... End surface 133, 233 ... Inner surface 140, 240 ... Connection pin 150, 250 ... Outer plate 151, 251 ... Pin hole 222 ... Oil sump the outer diameter D of the groove L _{1, L} 2 ... labyrinth structure D ₁ ... roller bearing inner diameter D ₂ ... rotary shaft of ₃ ... b Roller inner diameter D ₄ Bush outer diameter H ₁ Roller bearing depth H ₂ Rotating shaft protrusion H ₃ Space between left and right inner plates H _4.・ Roller width

Claims (5)

A pair of left and right inner plates, a pair of front and rear bushes press-fitted into a bush press-fitting hole of the inner plate, a pair of front and rear rollers rotatably fitted to the bush, and the inside of the bush A pair of front and rear connecting pins that are rotatably inserted and a pair of left and right outer plates that press-fit pin holes into both ends of the connecting pins and connect the inner plate in the longitudinal direction of the chain, and an inner peripheral surface of the roller, In a long-life chain in which lubricating oil is sealed between the bush and the outer peripheral surface,
A long-life chain, wherein a labyrinth structure is formed between an inner surface of the inner plate and an end surface of the roller. A pair of left and right inner plates, a pair of front and rear bushes press-fitted into a bush press-fitting hole of the inner plate, a pair of front and rear rollers rotatably fitted to the bush, and the inside of the bush A pair of front and rear connecting pins that are rotatably inserted and a pair of left and right outer plates that press-fit pin holes into both ends of the connecting pins and connect the inner plate in the longitudinal direction of the chain, and an inner peripheral surface of the roller, In a long-life chain in which lubricating oil is sealed between the bush and the outer peripheral surface,
Rotating shafts formed to project from both end faces of the roller toward the inner plate are respectively supported by roller bearing portions formed by facing the inner side surface of the inner plate in a diameter-enlarged state coaxial with the bushing press-fitting hole. Long-life chain characterized by   The long-life chain according to claim 2, wherein an oil sump groove for supplying a lubricant between the inner peripheral surface of the roller and the outer peripheral surface of the bush is formed on the outer peripheral surface of the bush. The inner diameter D ₁ of the roller bearing portion, the outer diameter D ₂ of the rotating shaft, the inner diameter D _{3 of} the roller, and the outer diameter D _{4 of the} bush are formed so as to satisfy D ₁ -D ₂ > D ₃ -D ₄ , respectively. The long-life chain according to claim 2, wherein the long-life chain is provided. The roller bearing portion depth H ₁ and the protrusion amount H _{2 of the} rotating shaft are formed so as to satisfy H ₁ <H ₂ , respectively.
The depth H ₁ of the roller bearing portion, the protrusion amount H ₂ of the rotating shaft, the distance H ₃ between the pair of left and right inner plates, and the width H _{4 of the} roller satisfy H ₁ + H ₃ <H ₄ + 2H ₂ <2H ₁ + H ₃ . The long-life chain according to any one of claims 2 to 4, wherein the long-life chain is formed so as to be satisfied.

Images