JP2008232444A - Wear-resistant chain - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wear-resistant chain capable of preventing leakage of lubricating oil and intrusion of outside dust, and suppressing sliding-contact wear between an outer circumference surface of a connecting pin and an inner circumference surface of a bush in operating the chain to prevent chain wear elongation over a long period of time. <P>SOLUTION: The wear-resistant chain 200 includes an inner link 240 and an outer link 270 alternately connected in a chain longitudinal direction. Both end parts of the bush 230 partially projecting from an outer side surface 212 of an inner plate 210 of the inner link 240 are respectively supported by a bush journaling part 252 which is formed by spot-facing an inner side surface of an outer plate 250 of the outer link 270 where a diameter is enlarged coaxially with a pin press-in hole 211. An oil sump groove 262 for supplying the lubricating oil between the inner circumference surface 231 of the bush 230 and the outer circumference surface 261 of the connecting pin 260 is ditched on the outer circumference surface 261 of the connection pin 260. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wear-resistant chain used for a transmission roller chain, a transport conveyor chain, and the like, and in particular, press-fits both ends of a pair of front and rear bushes into bush press-fit holes of a pair of left and right inner plates. The inner link and the outer link formed by press-fitting the both ends of the pair of front and rear connecting pins penetrating into the bushing into the pin press-fitting holes of the pair of left and right outer plates are alternately connected in the longitudinal direction of the chain, The present invention relates to a wear-resistant chain in which lubricating oil is sealed between an inner peripheral surface of a bush and an outer peripheral surface of a connecting pin.

Conventionally, an outer link in which both ends of two outer link plates are connected by pins and an inner link in which two inner link plates are connected by bushes are alternately connected by loosely fitting the pins to the bushes. In addition, there is known a seal chain provided with sealing means for sealing lubricating oil injected between the pin and the bush.
The sealing means of such a seal chain includes an elastic seal ring that is pressed between at least a ring member arranged so as to contact the axial end surface of the bush and an outer link plate facing the ring member. (For example, refer to Patent Document 1).
Japanese Patent Laying-Open No. 2004-256262 (Claims, FIG. 3)

  In the conventional seal chain as described above, the ring member and the elastic seal ring are used to seal between the bush and the outer link plate and maintain the sealing effect of the lubricating oil injected between the pin and the bush. Between the outer link plate and the outer link plate, and the pressing force in such a pressed state increases the relative bending resistance between the outer link plate and the inner link plate, that is, the bending resistance of the chain itself. There was a problem of becoming.

  Further, in order to prevent a reduction in the sealing effect caused by the sliding contact and abrasion of the ring member and the elastic seal ring with respect to the outer link plate, etc., the inner side surface of the outer link plate that contacts the ring member and the elastic seal ring There is a problem in that it is necessary to perform a surface finishing process to reduce the surface roughness of the end face of the bush, and the processing burden of the surface finishing process increases.

  Since the ring member and the elastic seal ring as the sealing means are provided between the bush and the outer plate, which are basic chain components, the number of parts and assembly man-hours of the chain increase, and the chain is easy to assemble. There was a problem of getting worse.

  Therefore, the present invention solves the conventional problems, that is, the object of the present invention is to prevent leakage of lubricating oil and intrusion of external dust when the chain is operated, and to prevent the outer peripheral surface of the connecting pin and the bushing from entering. Suppresses sliding wear with the inner peripheral surface of the belt to prevent chain wear elongation over a long period of time, reduces the number of parts in the chain, and reduces wear of the chain and chain assembly, etc. Is to provide a chain.

  According to the first aspect of the present invention, the inner link and the outer link formed by press-fitting both end portions of the pair of front and rear connecting pins respectively penetrating into the bush into the pin press-fitting holes of the pair of left and right outer plates In the wear-resistant chain that is alternately connected in the direction and in which lubricating oil is sealed between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin, both ends of the bush that partially protrude from the outer surface of the inner plate Are respectively supported by bushing shaft support portions formed by facing the inner side surface of the outer plate in a diameter-enlarged state coaxial with the pin press-fitting hole, and the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin An oil reservoir groove for supplying lubricating oil therebetween is engraved on the outer peripheral surface of the connecting pin, thereby solving the above-described problems.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the inner side surface of the outer plate and the outer side surface of the inner plate are provided with a labyrinth structure-forming rough surface that is close to each other. The above-described problems are further solved.
In addition, the labyrinth structure formation rough surface as used herein refers to a rough surface that can form a labyrinth structure that accumulates lubricating oil or suppresses intrusion of external dust.

  In addition to the configuration of claim 1 or claim 2, the present invention according to claim 3 includes an inner diameter Wj of the bushing shaft support, an inner diameter Wbi of the bush, an outer diameter Wbo of the bush, and an outer diameter Wp of the connecting pin. By forming each so as to satisfy Wj-Wbo> Wbi-Wp, the above-described problems are further solved.

  According to a fourth aspect of the present invention, in addition to the structure according to any one of the first to third aspects, the bushing shaft support portion has a counterbore depth Dj and a protruding amount of the bushing end portion from the outer surface of the inner plate. Db is formed so as to satisfy Dj <Db, the bushing shaft support portion has a counterbore depth Dj, a protrusion amount Db of the bushing end portion from the outer surface of the inner plate, an inner width Do of the outer link, and The outer width Di of the inner link is formed so as to satisfy Dj + Do <Di + 2Db <2Dj + Do, thereby further solving the above-described problems.

  Therefore, the present invention provides a pair of left and right ends of a pair of front and rear connecting pins penetrating into the bushing and the inner link formed by press-fitting both ends of the pair of front and rear bushes into the bush press-fitting holes of the pair of left and right inner plates. The outer links that are press-fitted into the pin press-fitting holes of the outer plate are alternately connected in the longitudinal direction of the chain, and lubricating oil is sealed between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin. As a result, not only can the chain drive be performed for a long period of time without lubrication from the outside, but also the following specific effects can be achieved.

  According to the wear-resistant chain of the present invention according to claim 1, both ends of the bush partially protruding from the outer surface of the inner plate are countersunk while the inner surface of the outer plate is coaxially expanded with the pin press-fitting hole. The labyrinth structure formed between the end of the bushing and the inner surface of the bushing shaft supporting part is supported by the bushing shaft supporting part. It is possible to prevent the lubricating oil from leaking and to prevent external dust from entering, thereby preventing the chain from being worn out over a long period of time.

In addition, there is no separate seal member between the inner plate and the outer plate between the bush and the outer link plate as in the conventional seal chain. While it bends and runs around, the number of parts of the chain is small, and disassembly and assembly work such as chain cut-off is easy.
In addition, in the conventional seal chain, the surface that reduces the surface roughness on the outer surface of the inner link plate and the inner surface of the outer link plate in order to prevent sliding contact wear of the seal member and maintain the sealing performance of the lubricating oil. Although it is necessary to perform finishing, the wear-resistant chain of the present invention does not need to be subjected to surface finishing as in the prior art, and the manufacturing burden of the chain can be reduced.

  Furthermore, an oil reservoir groove for supplying lubricating oil between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin is engraved on the outer peripheral surface of the connecting pin, thereby enclosing more lubricating oil. Since the lubricating oil can be continuously supplied between the connecting pin and the bushing, sliding wear on the outer peripheral surface of the connecting pin and the inner peripheral surface of the bushing can be reduced over a long period of time, and the wear elongation of the chain can be further increased. Can be prevented.

  According to the wear-resistant chain of the present invention according to claim 2, in addition to the effect exhibited by the wear-resistant chain according to claim 1, the inner surface of the outer plate and the outer surface of the inner plate are in close proximity to each other. Since the labyrinth structure forming rough surface is provided, a labyrinth structure is formed between the inner surface of the outer plate and the outer surface of the inner plate, so that the lubricating oil injected between the connecting pin and the bush The sealing effect can be further improved, and the lubricating oil injected between the bush and the connecting pin can be prevented from leaking to the outside and dust can be prevented from entering from the outside.

According to the wear-resistant chain of the present invention according to claim 3, in addition to the effect exhibited by the wear-resistant chain according to claim 1 or 2, the inner diameter Wj of the bushing shaft support, the inner diameter Wbi of the bush, The outer diameter Wbo and the outer diameter Wp of the connecting pin are formed so as to satisfy Wj-Wbo> Wbi-Wp, respectively, so that when the chain receives a tensile force in the chain traveling direction, that is, the inner link is outside Even if the inner peripheral surface of the bushing and the outer peripheral surface of the connecting pin come into contact with each other in the chain traveling direction with respect to the link and the lubricating oil is not sufficiently supplied, It completely prevents the surface and the inner peripheral surface of the bushing shaft support portion from contacting each other.
As a result, metal wear powder resulting from sliding contact between the outer peripheral surface of the bushing end and the inner peripheral surface of the bushing shaft support portion enters between the connecting pin and the bush, and such metal wear powder becomes an abrasive. Therefore, abnormal wear damage that tends to occur between the connecting pin and the bush can be prevented, and wear elongation of the chain can be largely prevented.

  According to the wear-resistant chain of the present invention according to claim 4, in addition to the effect exerted by the wear-resistant chain according to any one of claims 1 to 3, the counterbore depth Dj of the bushing shaft support portion and The amount of protrusion Db from the outer side of the inner plate at the bushing end is formed so as to satisfy Dj <Db, so that the inner link skews and swings in the chain width direction with respect to the outer link during chain operation. Or, even if it is unevenly distributed, the bushing end surface with a small sliding area and the bottom surface of the bushing shaft support part contact each other, and the outer side surface of the inner plate with a larger sliding area and the inner side surface of the outer plate come into contact with each other. Therefore, the chain can be smoothly bent and slid over a long period of time.

  Further, the counterbore depth Dj of the bushing shaft support portion, the protrusion amount Db of the bushing end portion from the outer surface of the inner plate, the inner width Do of the outer link, and the outer width Di of the inner link satisfy Dj + Do <Di + 2Db <2Dj + Do. Therefore, even when the inner link is skewed, swung, or offset in the chain width direction with respect to the outer link during chain operation, the bushing end is separated from the bushing shaft support. Therefore, leakage of lubricating oil and intrusion of external dust during chain operation can be prevented, and sliding wear between the outer peripheral surface of the connecting pin and the inner peripheral surface of the bush can be reduced over a long period of time. Elongation can be further prevented.

  The present invention provides an inner link formed by press-fitting both ends of a pair of front and rear bushes into bush press-fitting holes of a pair of left and right inner plates, and both ends of a pair of front and rear connecting pins penetrating into the bush. The outer links formed by press-fitting into the pin press-fitting holes of the outer plate are alternately connected in the chain longitudinal direction, and the lubricating oil is sealed between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin. In the wear chain, both ends of the bush that partially protrudes from the outer surface of the inner plate are supported by the bushing shaft support part, which is formed by counterboring the inner surface of the outer plate in a diameter-enlarged state coaxial with the pin press-fitting hole. In addition to preventing leakage of lubricating oil and intrusion of external dust when the chain is operating, the sliding wear between the outer peripheral surface of the connecting pin and the inner peripheral surface of the bushing is suppressed, preventing chain wear elongation over a long period of time. , Shika If decomposition assembling burden on parts of the chain stitch small chain manufacturing burden and the chain cutting is intended simple, form of the specific implementation may any be any one.

  That is, the wear-resistant chain of the present invention may be either a roller chain or a bush chain, but in the case of a roller chain, the meshing with the sprocket is smooth, It is more preferable because it prevents wear.

  In addition, the specific shape of the oil sump groove in the present invention may be any of a D-cut groove, an annular groove provided around the outer surface of the connecting pin, and the like. In this case, more lubricating oil can be enclosed while maintaining the strength of the connecting pin, which is more preferable.

  In addition, the specific shape of the bushing shaft support portion in the present invention may be any of a circular concave groove and a regular polygonal concave groove.

Hereinafter, a wear-resistant chain 100 as a reference example for helping understanding of the present invention will be described with reference to the drawings.
Here, FIG. 1 is an overall schematic diagram in which a part of a wear resistant chain which is a reference example for helping understanding of the present invention is cut out, and FIG. 2 is a connection of the wear resistant chain shown in FIG. 3 is a perspective view showing a state, FIG. 3 is a partially enlarged cross-sectional view of the wear-resistant chain shown in FIG. 1, and FIG. 4 is an assembly dimension diagram of the wear-resistant chain shown in FIG. FIG. 5 is a dimensional diagram showing a state in which the wear-resistant chain of FIG. 1 is pulled in the chain traveling direction, and FIG. 6 is a dimension showing a state in which the wear-resistant chain of FIG. 1 is offset in the chain width direction. FIG.

First, as shown in FIGS. 1 and 3, a wear-resistant chain 100, which is a reference example for helping understanding of the present invention, includes bush press-fit holes 111 in inner plates 110 and 110 that are spaced apart from each other on the left and right sides. , 111 is an inner link 140 in which both ends of a pair of front and rear bushes 130, 130 in which rollers 120, 120 are loosely fitted are fitted and fixed, and a pin press-fitting hole 151 in an outer plate 150, 150 that is spaced apart from the left and right. 151, an outer link 170 in which both ends of a pair of front and rear connecting pins 160, 160 are fitted and fixed.
Further, the inner link 140 and the outer link 170 are connected by loosely fitting the connecting pin 160 to the bush 130.
A lubricating oil is sealed between the bush 130 and the connecting pin 160.

Therefore, specific forms of the bush 130, the outer plate 150, and the inner plate 110, which are the most characteristic features of the wear-resistant chain 100 of this reference example, will be described in detail with reference to FIGS.
First, as shown in FIGS. 2 and 3, two bushing shaft support parts 152 formed by countersinking the inner side surface 153 of the outer plate 150 in an expanded state coaxial with the two pin press-fitting holes 151 and 151, 152 is provided.
Then, both end portions of the bush 130 protrude from the outer surface 112 of the inner plate 110 and are supported by the bush shaft support portion 152, respectively.
Further, as shown in FIG. 3, the inner side surface 153 of the outer plate 150 and the outer side surface 112 of the inner plate 110 are provided with matte surface labyrinth structure forming rough surfaces 153 a and 112 a, respectively.

Further, as shown in FIG. 4, the wear-resistant chain 100 has an inner diameter Wj of the bushing shaft support portion 152, an inner diameter Wbi of the bushing 150, an outer diameter Wbo of the bushing 130, and an outer diameter Wp of the connecting pin 160 such that Wj−Wbo> Each is formed so as to satisfy Wbi-Wp.
Then, the counterbore depth Dj of the bushing shaft support 152 and the protrusion amount Db of the bushing 130 from the outer surface 112 of the inner plate 110 are formed so as to satisfy Dj <Db.
Then, the counterbore depth Dj of the bushing shaft support portion 152, the protrusion amount Db of the bush 150 from the outer surface 112 of the inner plate 110, the inner width Do of the outer link 170, and the outer width Di of the inner link 140 are Dj + Do <Di + 2Db <. It is formed so as to satisfy 2Dj + Do.

The wear-resistant chain 100 of the reference example thus obtained to help understanding of the present invention is such that both ends of the bush 130 partially protruding from the outer surface 112 of the inner plate 110 are the inner surfaces of the outer plate 150. 153 is supported by a bushing shaft support portion 152 formed by counterbore processing in a diameter-enlarged state coaxial with the pin press-fitting hole 151.
Therefore, since the labyrinth structure L1 is formed between the end of the bush 130 and the inner surface of the bushing shaft support portion 152, leakage of lubricating oil due to centrifugal force or the like caused by the chain traveling during the chain operation is prevented. In addition to preventing dust from entering from the outside.

That is, when the chain hung around the sprocket is operated, the centrifugal force generated by the chain circling travels on the enclosed lubricating oil, and the lubricating oil is guided by the inner peripheral surface 131 of the bush 130 to be paired with the left and right outer sides. It exudes toward the plates 150 and 150.
At this time, the lubricating oil leakage path generated between the end of the bushing 130 and the bushing shaft support portion 152 exhibits a so-called labyrinth structure L1 that is complicatedly bent in the chain width direction and the chain traveling direction. Leakage of oil to the outside can be prevented.
Similarly, the labyrinth structure L1 can prevent dust from entering from the outside.

Further, the wear resistant chain 100 is not provided with any seal member as a separate part between the inner plate 110 and the outer plate 150.
Therefore, compared to a conventional seal chain in which the seal member is placed in a pressed state between the bush and the outer plate, it is smoothly bent and slid, and the number of parts of the chain is small. Is easy.
In order to prevent wear of the seal member and maintain the sealing performance of the lubricating oil, it is necessary to perform a surface finishing process to reduce the surface roughness of the outer surface of the inner link plate and the inner surface of the outer link plate. Unlike the seal chain, it is not necessary to perform such surface finishing, and the manufacturing burden of the chain can be reduced.

Further, the inner surface 153 of the outer plate 150 and the outer surface 112 of the inner plate 110 include labyrinth structure forming rough surfaces 153a and 112a that are close to each other and face each other.
Therefore, since the labyrinth structure L2 is formed between the inner side surface 153 of the outer plate 150 and the outer side surface 112 of the inner plate 110, the sealing effect of the lubricating oil injected between the connecting pin 160 and the bush 130 is achieved. The lubricating oil injected between the bush 130 and the connecting pin 160 can be prevented from leaking to the outside, and dust can be prevented from entering from the outside.

Further, the inner diameter Wj of the bushing shaft support 152, the inner diameter Wbi of the bush 130, the outer diameter Wbo of the bush 130, and the outer diameter Wp of the connecting pin 160 are formed so as to satisfy Wj-Wbo> Wbi-Wp.
Therefore, as shown in FIG. 5, even when the high load state tension acts on the wear-resistant chain 100 when the chain is in operation, the inner link 140 is offset from the outer link 170 in the chain traveling direction. 130 and the outer peripheral surface 161 of the connecting pin 160 are in contact with each other, and the outer peripheral surface 132 of the end of the bush 130 to which lubricating oil is not sufficiently supplied and the inner peripheral surface 152a of the bushing shaft support 152 are mutually connected. It can completely prevent contact.
As a result, metal wear powder generated due to the sliding contact between the outer peripheral surface 132 at the end of the bush 130 and the inner peripheral surface 152a of the bushing shaft support 152 enters between the connecting pin 160 and the bush 130, and this Such metal wear powder can be used as an abrasive to prevent abnormal wear damage between the connecting pin 160 and the bush 130, and to prevent wear elongation of the chain.

Then, the counterbore depth Dj of the bushing shaft support part 152 and the protruding amount Db of the end part of the bushing 130 from the outer surface 112 of the inner plate 110 are formed so as to satisfy Dj <Db.
Therefore, as shown in FIG. 6, even when the inner link 140 is skewed, swung, or offset in the chain width direction with respect to the outer link 170, the end surface 133 and the bushing of the bush 130 having a small sliding area. Since the bottom surface 152b of the shaft support 152 comes into contact with each other and the outer surface 112 of the inner plate 110 having a large sliding area and the inner surface 153 of the outer plate 150 are completely prevented from coming into contact with each other, smooth smooth operation over a long period of time is possible. The chain can be bent and slid.

Further, the counterbore depth Dj of the bushing shaft support portion 152, the protruding amount Db of the end portion of the bushing 130 from the outer surface 112 of the inner plate 110, the inner width Do of the outer link 170, and the outer width Di of the inner link 140 are Dj + Do. Each is formed so as to satisfy <Di + 2Db <2Dj + Do.
Therefore, as shown in FIG. 6, even when the inner link 140 is skewed, swung, or offset in the chain width direction with respect to the outer link 170, the end portion of the bush 130 is detached from the bush shaft support portion 152. Can prevent the leakage of lubricating oil and the entry of external dust during chain operation, and can reduce the sliding wear of the outer peripheral surface 161 of the connecting pin 160 and the inner peripheral surface 131 of the bush 130 over a long period of time, The effect is enormous, for example, it can prevent the chain from wear and elongation.

Next, an abrasion resistant chain 200 that is an embodiment of the present invention will be described with reference to FIGS.
First, as shown in FIGS. 7 and 8, the wear-resistant chain 200 according to the embodiment of the present invention has rollers 220 in the bush press-fitting holes 211 and 211 of the inner plates 210 and 210 that are spaced apart from each other on the left and right sides. , 220 are loosely fitted to the inner link 240 in which both ends of the pair of front and rear bushes 230, 230 are fitted and fixed, and the pair of front and rear is inserted into the pin press-fitting holes 251, 251 of the outer plates 250, 250 spaced apart from each other on the left and right. And the outer link 270 in which both ends of the connecting pins 260 and 260 are fitted and fixed.
Further, the inner link 240 and the outer link 270 are connected by loosely fitting the connecting pin 260 to the bush 230.
A lubricating oil is sealed between the bush 230 and the connecting pin 260.

Therefore, specific forms of the bush 230, the outer plate 250, the inner plate 210, and the connecting pin 260, which are the most characteristic features of the wear resistant chain 200 of this embodiment, will be described in detail with reference to FIGS.
First, as shown in FIGS. 7 and 8, two bush shaft support portions 252 formed by countersinking the inner side surface 253 of the outer plate 250 in a diameter-enlarged state coaxial with the two pin press-fitting holes 251 and 251, 252 is provided.
Then, both end portions of the bushing 230 protrude from the outer surface 212 of the inner plate 210 and are supported by the bushing shaft support portion 252, respectively.
As shown in FIG. 8, the inner surface 253 of the outer plate 250 and the outer surface 212 of the inner plate 210 are provided with a satin-like labyrinth structure forming rough surfaces 253a and 212a.
A D-cut oil sump groove 262 is formed on the outer peripheral surface of the connecting pin 260.

Further, in the wear-resistant chain 200, the inner diameter Wj of the bushing shaft support 252, the inner diameter Wbi of the bushing 250, the outer diameter Wbo of the bushing 250, and the outer diameter Wp of the connecting pin 260 satisfy Wj−Wbo> Wbi−Wp. Are formed respectively.
Then, the counterbore depth Dj of the bushing shaft support 252 and the protrusion amount Db of the bushing 250 from the outer surface 212 of the inner plate 210 are formed so as to satisfy Dj <Db.
Then, the counterbore depth Dj of the bushing shaft support portion 252, the protruding amount Db of the bushing 250 from the outer surface 212 of the inner plate 210, the inner width Do of the outer link 270, and the outer width Di of the inner link 240 are Dj + Do <Di + 2Db <. It is formed so as to satisfy 2Dj + Do.

In the wear-resistant chain 200 of this embodiment obtained in this way, both ends of the bushing 230 partially protruding from the outer surface 212 of the inner plate 210 are connected to the inner surface 253 of the outer plate 250 with the pin press-fit holes 251. Each is supported by a bushing shaft support portion 252 formed by counterbore processing in a coaxial expanded state.
Accordingly, since the labyrinth structure L3 is formed between the end of the bushing 230 and the inner surface of the bushing shaft support portion 252, the leakage of the lubricating oil due to the centrifugal force generated by the chain traveling during the chain operation is prevented. In addition, dust can be prevented from entering from the outside.

That is, when the chain hung around the sprocket is operated, the centrifugal force generated by the chain traveling travels on the lubricating oil, and the lubricating oil is guided by the inner peripheral surface 231 of the bushing 230 to the pair of left and right outer plates 250, 250. Bleed toward.
At this time, since the leakage path of the lubricating oil generated between the end of the bushing 230 and the bushing shaft support portion 252 exhibits a so-called labyrinth structure that is complicatedly bent in the chain width direction and the chain traveling direction. Can be prevented from leaking outside.
Similarly, the labyrinth structure L3 can prevent dust from entering from the outside.

Further, the wear resistant chain 200 does not have any seal member between the inner plate 210 and the outer plate 250.
Therefore, compared with the conventional seal chain in which the seal member is arranged in a compressed state between the bush and the outer plate, it is smoothly bent and slid, and the number of parts of the chain is small. Is easy.
In order to prevent wear of the seal member and maintain the sealing performance of the lubricating oil, it is necessary to perform a surface finishing process to reduce the surface roughness of the outer surface of the inner link plate and the inner surface of the outer link plate. Unlike the seal chain, it is not necessary to perform such surface finishing, and the manufacturing burden of the chain can be reduced.

Further, an oil reservoir groove 262 for supplying lubricating oil between the inner peripheral surface 231 of the bush 230 and the outer peripheral surface 261 of the connecting pin 260 is carved on the outer peripheral surface 261 of the connecting pin 260.
Accordingly, a larger amount of lubricating oil can be enclosed, and the lubricating oil can be continuously supplied between the connecting pin 260 and the bushing 230, so that the outer peripheral surface 261 of the connecting pin 260 and the inner peripheral surface 231 of the bushing 230 are Sliding wear can be reduced over a long period of time, and chain wear elongation can be prevented.

Further, the inner side surface 253 of the outer plate 250 and the outer side surface 212 of the inner plate 210 are provided with labyrinth structure forming rough surfaces 253a and 212a that are close to each other.
Therefore, since the labyrinth structure L4 is formed between the inner surface 253 of the outer plate 250 and the outer surface 212 of the inner plate 210, the sealing effect of the lubricating oil injected between the connecting pin 260 and the bushing 230 is achieved. The lubricating oil injected between the bushing 230 and the connecting pin 260 can be prevented from leaking outside, and dust can be prevented from entering from the outside.

Further, the inner diameter Wj of the bushing shaft support 252, the inner diameter Wbi of the bushing 230, the outer diameter Wbo of the bushing 230, and the outer diameter Wp of the connecting pin 260 are formed so as to satisfy Wj−Wbo> Wbi−Wp, respectively.
Therefore, even when the tension is applied to the wear resistant chain 200 and the inner link 240 is offset in the chain moving direction with respect to the outer link 270, the inner peripheral surface 231 of the bush 230 and the outer peripheral surface 261 of the connecting pin 260. , And the outer peripheral surface 232 at the end of the bushing 230 to which the lubricating oil is not sufficiently supplied can be completely prevented from coming into contact with the inner peripheral surface 152a of the bushing shaft support portion 252.
As a result, metal wear powder generated due to the sliding contact between the outer peripheral surface 232 at the end of the bushing 230 and the inner peripheral surface 252a of the bushing shaft support 252 enters between the connecting pin 260 and the bushing 230, Such metal wear powder can be used as an abrasive to prevent abnormal wear damage between the connecting pin 260 and the bushing 230 and to prevent wear elongation of the chain.

Then, the counterbore depth Dj of the bushing shaft support portion 252 and the protruding amount Db of the end portion of the bushing 230 from the outer surface 212 of the inner plate 210 are formed so as to satisfy Dj <Db.
Therefore, even when the inner link 240 is skewed, swung, or offset in the chain width direction with respect to the outer link 270, the end surface 233 of the bushing 230 with a small sliding area and the bottom surface 252b of the bushing shaft support portion 252 Are in contact with each other to completely prevent the outer surface 212 of the inner plate 210 having a large sliding area and the inner surface 253 of the outer plate 250 from coming into contact with each other. it can.

Further, the counterbore depth Dj of the bushing shaft support portion 252, the protruding amount Db of the end portion of the bushing 230 from the outer surface 212 of the inner plate 210, the inner width Do of the outer link 270, and the outer width Di of the inner link 240 are Dj + Do. Each is formed so as to satisfy <Di + 2Db <2Dj + Do.
Therefore, even when the inner link 240 is skewed, swung, or offset in the chain width direction with respect to the outer link 270, the end of the bushing 230 is prevented from being detached from the bushing shaft support portion 252, and the chain It is possible to prevent leakage of lubricating oil and intrusion of external dust during operation, reduce sliding wear of the outer peripheral surface 261 of the connecting pin 260 and the inner peripheral surface 231 of the bushing 230 over a long period of time, and prevent chain wear elongation. The effect is enormous.

BRIEF DESCRIPTION OF THE DRAWINGS The whole schematic diagram which notched a part of the abrasion-resistant chain which is a reference example for helping an understanding of this invention. The perspective view which shows the connection state of the wear-resistant chain shown in FIG. FIG. 2 is a cross-sectional view of a part of the wear-resistant chain shown in FIG. FIG. 2 is an assembly dimension diagram of the wear-resistant chain shown in FIG. 1. The dimension diagram which shows the state by which the abrasion-resistant chain of FIG. 1 was pulled in the chain advancing direction. FIG. 2 is a dimensional diagram illustrating a state in which the wear-resistant chain of FIG. 1 is offset in the chain width direction. The perspective view which shows the connection state of the abrasion-resistant chain which is an Example of this invention. FIG. 8 is a cross-sectional view of a part of the wear-resistant chain shown in FIG.

Explanation of symbols

100, 200 ... Wear-resistant chain 110, 210 ... Inner plate 111, 211 ... Bush press-fit hole 112, 212 ... Outer side surface 112a, 212a ... Labyrinth structure forming rough surface 120, 220 .... Rollers 130, 230 ... Bush 131, 231 ... Inner peripheral surface 132, 232 ... Outer peripheral surface 133, 233 ... End surface 140, 240 ... Inner link 150, 250 ... Outer plate 151, 251 ... Pin press-fit holes 152, 252 ... Bush shaft supports 152a, 252a ... Inner peripheral surfaces 152b, 252b ... Bottom 153, 253 ... Inner side 153a, 253a ... Labyrinth structure Formed rough surface 160, 260... Connecting pin 161, 261.・ ・ ・ Outer link 262 ・ ・ ・ Oil sump groove L1, L2, L3, L4 ・ ・ ・ Labyrinth structure Wj ・ ・ ・ Inner diameter of bushing shaft support Wbi ・ ・ ・ Inner diameter of bushing Wbo ・ ・ ・ Outer diameter of bushing Wp ・.... Outer diameter of connecting pin Dj ... Counterbore depth of bushing shaft support Db ... Projection amount of bush end from outer side of inner plate Do ... Inner width of outer link Di ... Inner Link outer width

Claims (4)

Pins of a pair of left and right outer plates are connected to inner links formed by press-fitting both ends of a pair of front and rear bushes into bush press-fitting holes of a pair of left and right inner plates and a pair of front and rear connection pins penetrating into the bushes. In the wear-resistant chain in which outer links formed by press-fitting into press-fitting holes are alternately connected in the longitudinal direction of the chain, and lubricating oil is sealed between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin. ,
Both ends of the bush partially protruding from the outer surface of the inner plate are respectively supported by bushing shaft support portions formed by scooping the inner surface of the outer plate in a diameter-enlarged state coaxial with the pin press-fit hole,
A wear-resistant chain, wherein an oil reservoir groove for supplying lubricating oil between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin is carved on the outer peripheral surface of the connecting pin.   The wear-resistant chain according to claim 1, wherein an inner surface of the outer plate and an outer surface of the inner plate are provided with rough surfaces that form a labyrinth structure that face each other.   The inner diameter Wj of the bushing shaft support part, the inner diameter Wbi of the bush, the outer diameter Wbo of the bushing, and the outer diameter Wp of the connecting pin are formed so as to satisfy Wj-Wbo> Wbi-Wp, respectively. The wear-resistant chain according to claim 1 or 2. The counterbore depth Dj of the bushing shaft support part and the protrusion amount Db of the bushing end part from the outer surface of the inner plate are formed so as to satisfy Dj <Db, respectively.
The counterbore depth Dj of the bushing shaft support portion, the protrusion amount Db of the bushing end portion from the outer surface of the inner plate, the inner width Do of the outer link, and the outer width Di of the inner link satisfy Dj + Do <Di + 2Db <2Dj + Do. The wear-resistant chain according to any one of claims 1 to 3, wherein each of the wear-resistant chains is formed.

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