JP2009097620A - Oilless multi-row chain - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oilless multi-row chain, easy in a disassembling-installation work burden, by restraining sliding contact abrasion between an outer peripheral surface of a connection pin and an inner peripheral surface of a bush, by preventing leaking-out of lubricating oil and intrusion of outside dust-dirt, without increasing a chain manufacturing burden. <P>SOLUTION: This oilless multi-row chain 100 is constituted of an inner plate 110, the bush 130, an intermediate plate 150, an outer plate 160 and the connection pin 170, and is provided by sealing the lubricating oil between the bush 130 and the connection pin 170, and by arranging a labyrinth structure forming member 180 for a first oil reservoir for sealing the lubricating oil on the outer plate 160 side between an inside surface of the outer plate 160 and an outside surface of the inner plate 110, and by arranging a labyrinth structure forming member 190 for a second oil reservoir for sealing the lubricating oil on the intermediate plate 150 side between an inside surface of the intermediate plate 150 and the outside surface of the inner plate 110. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a multi-row chain used for transmitting a large amount of power, and in particular, an inner link unit formed by press-fitting a pair of front and rear bushes to a pair of left and right inner plates is provided in the chain width direction. A plurality of inner link units are connected via a connecting pin that is press-fitted into a pin hole of an outer plate that is arranged on the outermost side in the chain width direction. The present invention relates to an oil-free multi-row chain in which lubricating oil is enclosed.

In general, for a transmission mechanism having a large power transmission load, a multi-row chain having a high strength by, for example, arranging a plurality of chains in parallel in the chain width direction and integrating them is used.
And, as such a conventional multi-strength chain with increased strength, an inner link unit assembled by press-fitting a pair of front and rear bushes to a pair of left and right inner plates is interposed via a pair of left and right adjacent intermediate plates. There is known a multi-row chain that is arranged in parallel in the chain width direction and in which the inner link unit is connected in a large number in the longitudinal direction of the chain by connecting pins that are press-fitted to the outer plate arranged on the outermost side in the chain width direction. (For example, see Patent Document 1). In such a multi-row chain, a seal member such as an O-ring is provided between the outer plate and the inner plate in order to suppress sliding contact wear generated between the bush and the connecting pin and prevent chain wear elongation. It is generally performed to prevent the lubricating oil injected between the bushing and the connecting pin from being leaked by being disposed in a pressed state between the intermediate plate and the inner plate.
Japanese Patent Laid-Open No. 11-132295 (see column 4, FIG. 11)

  However, in the conventional multi-row chain as described above, the seal member is disposed in a pressed state between the outer plate and the inner plate and between the intermediate plate and the inner plate. Due to the pressing force, there is a problem that the relative bending resistance between the outer plate and the inner plate and between the intermediate plate and the inner plate, that is, the bending resistance of the chain itself is increased. There was a problem that disassembly and assembly work became difficult.

In addition, in order to prevent the sealing effect from deteriorating due to sliding contact and wear of the seal member against the outer plate, inner plate, intermediate plate, etc., the inner surface of the outer plate contacting the seal member, the inner surface of the intermediate plate In addition, it is necessary to perform surface finishing to reduce the surface roughness of the outer surface of the inner plate, and there is a problem that the processing burden of the surface finishing increases.
And, an installation space for sealing members such as O-rings is required between the outer plate and the inner plate and between the intermediate plate and the inner plate, and the dimension in the chain width direction is larger than that of a multi-chain chain with a normal standard. Due to the increase in size, it is not possible to apply a multi-row chain sprocket with a normal lateral pitch, that is, a multi-row chain sprocket in which the sprocket teeth are arranged in parallel in the sprocket thickness direction at regular intervals. There was a problem.

  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 during chain operation without increasing the chain manufacturing burden. Another object of the present invention is to provide an oil-free multi-row chain which suppresses sliding contact wear between the outer peripheral surface of the connecting pin and the inner peripheral surface of the bush and is simple in the work of disassembling and assembling such as chain cut-off.

  In the present invention according to claim 1, an inner link unit formed by press-fitting a pair of front and rear bushes to a pair of left and right inner plates is arranged in parallel via two intermediate plates in the chain width direction, A large number of inner link units are connected in the longitudinal direction of the chain by a pair of front and rear connection pins that are press-fitted into a pair of front and rear pin holes of the outer plate arranged on the outermost side in the chain width direction, and the inner peripheral surface of the bush and the connection pin In a non-lubricated multi-row chain formed by enclosing lubricating oil between the outer peripheral surface of the first labyrinth structure forming member for sealing the lubricating oil on the outer plate side, the inner surface of the outer plate A second oil sump labyrinth structure forming member disposed between the outer plate and the outer surface of the inner plate facing the outer plate and sealing the lubricating oil on the intermediate plate side, By being placed between the outer surface of the plate inner facing the inner and the intermediate plate rate is obtained by solving the problems described above.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, the labyrinth structure forming member for the first oil sump is disposed on the outer plate side and partially protrudes from the outer surface of the inner plate. A bushing protrusion comprising a disk with a first lip that surrounds and supports the bushing protruding end portion, and wherein the second oil sump labyrinth structure forming member is disposed on the intermediate plate side and partially protrudes from the outer surface of the inner plate The above-described problem is solved by using a disk with a second lip that surrounds and supports the end portion.

  According to a third aspect of the present invention, in addition to the configuration according to the second aspect, the first lip-attached disk is fitted on the connecting pin and is interposed between the inner surface of the outer plate and the outer surface of the inner plate. The first disc main body portion is interposed between the outer peripheral edge of the first disc main body portion and the first lip portion standing from the outer peripheral surface of the inner plate to the outer surface of the inner plate. A second disc body part fitted on the pin and interposed between the inner side surface of the intermediate plate and the outer side surface of the inner plate, and a second disc standing from the outer peripheral edge of the second disc body unit toward the outer side surface of the inner plate. By being comprised from 2 lip | rip parts, the subject mentioned above is further solved.

  According to a fourth aspect of the present invention, in addition to the configuration of the first aspect, the first oil sump labyrinth structure forming member is disposed on the outer plate side and partially protrudes from the outer surface of the inner plate. A bushing projection comprising a sleeve with a first flange surrounding and supporting the bushing projection end portion, wherein the second oil sump labyrinth structure forming member is disposed on the intermediate plate side and partially projects from the outer surface of the inner plate By comprising the sleeve with the second flange that surrounds and supports the end portion, the above-described problems are further solved.

  According to a fifth aspect of the present invention, in addition to the configuration according to the fourth aspect, the first sleeve main body portion, in which the sleeve with the first flange is externally fitted to the connection pin and interposed between the connection pin and the bush, A first flange portion extending between the inner surface of the outer plate and the outer surface of the inner plate from the end of the first sleeve main body portion and the outer peripheral edge of the first flange portion to the outer surface of the inner plate. A second lip portion that is erected toward the second sleeve body, and a second sleeve body portion that is externally fitted to the connecting pin and is interposed between the connecting pin and the bush. A second flange portion extending between the inner surface of the intermediate plate and the outer surface of the inner plate from the end portion of the sleeve main body portion, and a standing leg from the outer peripheral edge of the second flange portion toward the outer surface of the inner plate And the second lip part By being al structure, it is a further solve the aforementioned problems.

  According to a sixth aspect of the present invention, in addition to the structure of the first aspect, the labyrinth structure forming member for the first oil sump is concentric with the connecting pin on the inner side surface of the outer plate and the outer side surface of the inner plate. The first seal ring that is loosely fitted and held in the recessed first ring holding grooves, and the second oil sump labyrinth structure forming member is connected to the inner side surface of the intermediate plate and the outer side surface of the inner plate The above-described problem is further solved by comprising a second seal ring that is loosely fitted and held in a second ring holding groove that is concentric with each pin and recessed.

  According to a seventh aspect of the present invention, in addition to the configuration of the first aspect, the labyrinth structure forming member for the first oil sump protrudes from the inner surface of the outer plate toward the outer surface of the inner plate. The second bushing labyrinth structure forming member is formed of an inner plate of the intermediate plate, and includes a first bushing shaft support collar that surrounds and supports a bushing protruding end part that is fixedly protruded from the outer surface of the inner plate. The second bushing shaft support collar is fixed to protrude from the side surface toward the outer side surface of the inner plate and surrounds and supports the bushing protruding end partly protruding from the outer side surface of the inner plate. It solves the problem further.

The “inner surface of the inner plate” in the oil-free multi-row chain of the present invention means a side surface facing the inner side of the incorporated inner link unit, and is referred to as “the outer surface of the inner plate”. Means the side facing the outside of the incorporated inner link unit.
In addition, the “inner side surface of the outer plate” in the oil-free multi-row chain of the present invention means the side surface facing the inner side of the chain, and the “outer side surface of the outer plate” means the outer side of the chain. It means the side facing.
Further, the "inner side surface of the intermediate plate" in the oil-free multi-row chain of the present invention means the side surface facing the closest inner link unit side, and the "outer side surface of the intermediate plate" Means the side surface facing the adjacent intermediate plate.

  Accordingly, the present invention provides an inner link unit in which a pair of front and rear bushes are press-fitted and fitted to a pair of left and right inner plates arranged in parallel via two intermediate plates in the chain width direction. A large number of coupling pins are connected in the longitudinal direction of the chain by a pair of front and rear connection pins that are press-fitted into a pair of front and rear pin holes of the outer plate arranged on the outermost side in the chain width direction, and the inner peripheral surface of the bush and the outer peripheral surface of the connection pin By enclosing the lubricating oil between them, not only can the chain drive be performed for a long period of time without oil supply from the outside, but also the following specific effects can be achieved.

  According to the oil-free multi-row chain of the present invention according to claim 1, the first oil sump labyrinth structure forming member that seals the lubricating oil on the outer plate side faces the inner surface of the outer plate and the outer plate. The second oil sump labyrinth structure forming member that is disposed between the outer surface of the inner plate and seals the lubricating oil on the intermediate plate side is disposed between the inner surface of the intermediate plate and the intermediate plate. The first oil sump labyrinth structure formed between the inner surface of the outer plate and the outer surface of the inner plate in this way and the inner surface of the intermediate plate are disposed between the outer surface and the inner surface of the intermediate plate. The labyrinth structure for the second oil sump formed between the outer surface of the inner plate exhibits an oil sump function due to a complicatedly bent shape, and is caused by centrifugal force generated by circular running during chain running. The outer surface of the bushing and the outer peripheral surface of the connecting pin are prevented from leaking out of the lubricating oil and the entry of external dust is suppressed. Damage can be reduced and chain wear elongation can be prevented over a long period of time.

  According to the oil-free multi-row chain of the present invention according to claim 2, in addition to the effect of the oil-free multi-row chain according to claim 1, the labyrinth structure forming member for the first oil sump is disposed on the outer plate side. A disc with a first lip that surrounds and supports the bushing protruding end part of the inner plate that protrudes partially from the outer surface of the inner plate, and a second oil sump labyrinth structure forming member is disposed on the intermediate plate side to A first oil sump formed between the disk with the first lip and the bushing projecting end portion in this way is composed of the disk with the second lip that surrounds and supports the bushing projecting end portion that partially projects from the outer surface. The labyrinth structure for oil, the second labyrinth structure for oil sump formed between the disk with the second lip and the bushing projecting end part exhibits the oil sump function due to the complicatedly bent shape Because it suppresses external leakage of the lubricating oil enclosed between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin due to centrifugal force generated by circular traveling during chain travel, and also suppresses intrusion of external dust The wear damage on the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin can be reduced, and chain wear elongation can be prevented over a long period of time.

  Also, the first lip disc is disposed between the inner surface of the outer plate and the outer surface of the inner plate, and the second lip disc is disposed between the inner surface of the intermediate plate and the outer surface of the inner plate. Therefore, the outer plate and the inner plate have a concave shape that surrounds and supports the bushing protruding end without subjecting the inner surface of the outer plate and the inner surface of the intermediate plate to machining, such as grinding and milling, which have a heavy processing load. And between the intermediate plate and the inner plate, an increase in chain manufacturing burden can be avoided.

In addition, by arranging the disc with the first lip and the disc with the second lip with a gap between the bushes, the disc between the outer plate and the inner plate and between the intermediate plate and the inner plate are arranged. Compared with the conventional multi-row chain in which the seal members are arranged in a pressed state, disassembly and assembly work such as chain cut-off can be easily achieved, and smooth chain bending motion can be realized during chain operation.
Further, in the conventional multi-row chain, in order to prevent the sliding contact wear of the seal member and maintain the sealing performance of the lubricating oil, the inner surface of the outer plate, the inner surface of the intermediate plate, The outer surface of the plate had to be surface-finished to reduce the surface roughness, but the oil-free multi-row chain of the present invention does not need to be surface-finished as in the past, reducing the chain manufacturing burden. Can be reduced.

  According to the oil-free multi-row chain of the present invention according to claim 3, in addition to the effect exhibited by the oil-free multi-row chain according to claim 2, the disk with the first lip is externally fitted to the connecting pin, and the outer plate And a first lip portion that stands from the outer peripheral edge of the first disc body portion toward the outer surface of the inner plate. In addition, the second disk body with the second lip is fitted on the connecting pin and interposed between the inner surface of the intermediate plate and the outer surface of the inner plate, and the outer plate from the outer periphery of the second disk body. The first labyrinth structure for oil sump formed between the disk with the first lip and the bush protruding end portion in this way is constituted by the second lip portion that stands on the outer surface of the first lip portion. 2nd li The labyrinth structure for the second oil sump formed between the attached disk and the bushing protruding end portion exerts an oil sump function due to a complicatedly bent shape, so that the centrifugal force generated by the circular running during chain running, etc. As a result, external leakage of the lubricating oil sealed between the inner peripheral surface of the bushing and the outer peripheral surface of the connecting pin is suppressed and intrusion of external dust is suppressed, so that the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin are It is possible to reduce wear damage and prevent chain wear elongation over a long period of time.

  Also, the first lip disc is disposed between the inner surface of the outer plate and the outer surface of the inner plate, and the second lip disc is disposed between the inner surface of the intermediate plate and the outer surface of the inner plate. Therefore, the outer plate and the inner plate have a concave shape that surrounds and supports the bushing protruding end without subjecting the inner surface of the outer plate and the inner surface of the intermediate plate to machining, such as grinding and milling, which have a heavy processing load. And between the intermediate plate and the inner plate, an increase in chain manufacturing burden can be avoided.

In addition, by arranging the disc with the first lip and the disc with the second lip with a gap between the bushes, the disc between the outer plate and the inner plate and between the intermediate plate and the inner plate are arranged. Compared with the conventional multi-row chain in which the seal members are arranged in a pressed state, disassembly and assembly work such as chain cut-off can be easily achieved, and smooth chain bending motion can be realized during chain operation.
Further, in the conventional multi-row chain, in order to prevent the sliding contact wear of the seal member and maintain the sealing performance of the lubricating oil, the inner surface of the outer plate, the inner surface of the intermediate plate, The outer surface of the plate had to be surface-finished to reduce the surface roughness, but the oil-free multi-row chain of the present invention does not need to be surface-finished as in the past, reducing the chain manufacturing burden. Can be reduced.

  According to the oil-free multi-row chain of the present invention according to claim 4, in addition to the effect exhibited by the oil-free multi-row chain of claim 1, the labyrinth structure forming member for the first oil sump is disposed on the outer plate side. And a second flanged labyrinth structure forming member is disposed on the intermediate plate side, and comprises a sleeve with a first flange that surrounds and supports the bushing protruding end portion that partially protrudes from the outer surface of the inner plate. A first oil sump formed between the sleeve with the first flange and the bushing protruding end portion in this way by comprising the sleeve with the second flange surrounding and supporting the bushing protruding end portion partially protruding from the outer surface. The labyrinth structure for the oil, the second labyrinth structure for the oil sump formed between the disk with the second lip and the bushing protruding end portion has an oil sump function due to a complicatedly bent shape. As a result, the external leakage of the lubricating oil sealed between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin caused by centrifugal force generated by circular traveling during chain travel is suppressed and the entry of external dust is prevented. Therefore, wear damage on the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin can be reduced, and chain wear elongation can be prevented over a long period of time.

  The first flanged sleeve is disposed between the inner surface of the outer plate and the outer surface of the inner plate, and the second flanged sleeve is disposed between the inner surface of the intermediate plate and the outer surface of the inner plate. Therefore, the outer plate and the inner plate have a concave shape that surrounds and supports the bushing protruding end without subjecting the inner surface of the outer plate and the inner surface of the intermediate plate to machining, such as grinding and milling, which have a heavy processing load. And between the intermediate plate and the inner plate, an increase in chain manufacturing burden can be avoided.

Further, by arranging the sleeve with the first flange and the sleeve with the second flange with a gap between the bushes, the space between the outer plate and the inner plate and the space between the intermediate plate and the inner plate. Compared with the conventional multi-row chain in which the seal members are arranged in a pressed state, disassembly and assembly work such as chain cut-off can be easily achieved, and smooth chain bending motion can be realized during chain operation.
Further, in the conventional multi-row chain, in order to prevent the sliding contact wear of the seal member and maintain the sealing performance of the lubricating oil, the inner surface of the outer plate, the inner surface of the intermediate plate, The outer surface of the plate had to be surface-finished to reduce the surface roughness, but the oil-free multi-row chain of the present invention does not need to be surface-finished as in the past, reducing the chain manufacturing burden. Can be reduced.

  According to the oil-free multi-row chain of the present invention according to claim 5, in addition to the effect of the oil-free multi-row chain according to claim 4, the sleeve with the first flange is externally fitted to the connection pin, A first flange body and a first flange interposed between the bushing and extending between the inner surface of the outer plate and the outer surface of the inner plate from the end of the first sleeve body. And a second flanged sleeve that is externally fitted to the connecting pin and interposed between the connecting pin and the bush. The second sleeve main body and the second flange portion interposed between the inner surface of the intermediate plate and the outer surface of the inner plate from the end of the second sleeve main body and the inner plate from the outer peripheral edge of the second flange portion. On the outer surface of Since the second lip portion is constructed to stand upright, the labyrinth structure for the first oil sump formed between the sleeve with the first flange and the bushing protruding end portion and the second lip is thus provided. The second labyrinth structure for oil sump formed between the disc and the bushing protruding end exerts the oil sump function due to the complicatedly bent shape, resulting from centrifugal force generated by circular running during chain running, etc. The outer surface of the bushing and the outer peripheral surface of the connecting pin are prevented from leaking out of the lubricating oil and the entry of external dust is suppressed. Damage can be reduced and chain wear elongation can be prevented over a long period of time.

  An annular oil reservoir is formed between the outer peripheral surface of the connecting pin, the inner peripheral surface of the bush, the first sleeve main body portion of the sleeve with the first flange, and the second sleeve main body portion of the sleeve with the second flange. Since a large amount of lubricating oil can be enclosed in such an annular oil reservoir, the outer peripheral surface of the first sleeve main body of the sleeve with the first flange, the outer peripheral surface of the second sleeve main body of the sleeve with the second flange, and the bush The lubrication oil can be continuously supplied to the inner peripheral surface of the chain to reduce the wear elongation of the chain over a long period of time, and this annular oil sump is connected to the outer peripheral surface of the connecting pin in the conventional multi-row chain. Since it is wider than the oil reservoir area formed between the inner peripheral surface of the bushing, various types of lubricants such as powder lubricants, solid lubricants, greases, etc., are encapsulated. be able to.

  In addition, the first flanged sleeve and the second flanged sleeve are externally fitted to the connecting pin, so that the first flanged sleeve, the second flanged sleeve, and the bush constitute the bearing portion. Therefore, it is not necessary for the connecting pin to have wear resistance, and it is only necessary to have toughness to receive shearing force and impact force due to chain tension, so that the toughness of the connecting pin can be maximized. it can.

  Further, the first flange portion and the first lip portion of the sleeve with the first flange are disposed between the inner surface of the outer plate and the outer surface of the inner plate, and the second flange portion and the second flange portion of the sleeve with the second flange are disposed. 2 By placing the lip part between the inner surface of the intermediate plate and the outer surface of the inner plate, machining such as grinding and milling with a heavy processing load is applied to the inner surface of the outer plate and the inner surface of the intermediate plate. Without application, the recess shape surrounding and supporting the bushing protruding end portion can be formed between the outer plate and the inner plate and between the intermediate plate and the inner plate, so that an increase in the chain manufacturing burden can be avoided.

Further, by arranging the sleeve with the first flange and the sleeve with the second flange with a gap between the bushes, the space between the outer plate and the inner plate and the space between the intermediate plate and the inner plate. Compared with the conventional multi-row chain in which the seal members are arranged in a pressed state, disassembly and assembly work such as chain cut-off can be easily achieved, and smooth chain bending motion can be realized during chain operation.
Further, in the conventional multi-row chain, in order to prevent the sliding contact wear of the seal member and maintain the sealing performance of the lubricating oil, the inner surface of the outer plate, the inner surface of the intermediate plate, The outer surface of the plate had to be surface-finished to reduce the surface roughness, but the oil-free multi-row chain of the present invention does not need to be surface-finished as in the past, reducing the chain manufacturing burden. Can be reduced.

  According to the oil-free multi-row chain of the present invention according to claim 6, in addition to the effect exhibited by the oil-free multi-row chain according to claim 1, the labyrinth structure forming member for the first oil sump is provided on the inner surface of the outer plate. And a first seal ring that is loosely fitted and held in a first ring holding groove concentrically formed with the connecting pin on the outer surface of the inner plate and a second labyrinth structure forming member for oil sump, Since the second seal ring is loosely held by the second ring holding groove concentrically formed on the inner side surface and the outer side surface of the inner plate, respectively, the first ring holding groove and the first ring are thus formed. The labyrinth structure for the first oil sump formed between the first seal ring and the labyrinth structure for the second oil sump formed between the second ring holding groove and the second seal ring are complicatedly bent. In The oil reservoir function is exerted to suppress external leakage of the lubricating oil enclosed between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin due to centrifugal force generated by the circular traveling during chain traveling. In addition, since the intrusion of external dust is suppressed, wear damage on the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin can be reduced, and chain wear elongation can be prevented over a long period of time. Between the inner surface, the outer surface of the inner plate, and the inner peripheral surface of the first seal ring, and the outer peripheral surface of the connecting pin, the inner surface of the intermediate plate, the outer surface of the inner plate, and the inner peripheral surface of the second seal ring Since the lubricating oil is stored in the annular oil reservoir region formed between the two, the momentum of the lubricating oil that tries to exude from the annular oil reservoir region is suppressed, so that the sealing effect can be further improved.

Further, since the first seal ring is loosely fitted and held in the first ring holding groove and the second seal ring is loosely fitted and held in the second ring holding groove, it is provided between and between the outer plate and the inner plate. Compared to a conventional multi-row chain in which a seal member is placed in a pressed state between the plate and the inner plate, disassembly and assembly work such as chain cut-off can be easily achieved, and smooth chain bending movement during chain operation realizable.
Further, in the conventional multi-row chain, in order to prevent the sliding contact wear of the seal member and maintain the sealing performance of the lubricating oil, the inner surface of the outer plate, the inner surface of the intermediate plate, The outer surface of the plate had to be surface-finished to reduce the surface roughness, but the oil-free multi-row chain of the present invention does not need to be surface-finished as in the past, reducing the chain manufacturing burden. Can be reduced.
In the conventional multi-row chain, an installation space for forming a sealing member such as an O-ring is required between the outer plate and the inner plate, and between the intermediate plate and the inner plate. The row chain is designed with the same dimension in the width direction of the chain as the standard multi-row chain without the need for a conventional seal member installation space. Sprockets, that is, sprockets for multi-row chains in which the sprocket teeth are arranged in parallel in the sprocket thickness direction at regular intervals according to the standard can be applied.

  According to the oil-free multi-row chain of the present invention according to claim 7, in addition to the effect exhibited by the oil-free multi-row chain according to claim 1, the labyrinth structure forming member for the first oil sump is provided on the inner surface of the outer plate. A first bushing shaft support collar that is fixed so as to protrude from the inner plate toward the outer surface of the inner plate and surrounds and supports the bushing protruding end portion that partially protrudes from the outer surface of the inner plate. A second bushing shaft support in which the labyrinth structure forming member is fixed so as to protrude from the inner surface of the intermediate plate toward the outer surface of the inner plate, and surrounds and supports the bushing protruding end portion partially protruding from the outer surface of the inner plate. Accordingly, the first oil sump labyrinth structure formed between the first bushing shaft support collar and the bushing protruding end, the second bushing shaft support collar, and the bushing protruding end. The inner peripheral surface of the bush caused by the centrifugal force generated by the circular running during the chain running, in which the labyrinth structure for the second oil sump formed between the two exerts the oil collecting function by the complicatedly bent shape Since the external leakage of the lubricating oil sealed between the outer peripheral surface of the connecting pin and the outer periphery of the connecting pin is suppressed and the intrusion of external dust is suppressed, the wear damage on the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin is reduced. Wear elongation can be prevented over a long period of time.

  In addition, the first bushing shaft support collar is fixed to the inner surface of the outer plate and the second bushing shaft support collar is fixed to the inner surface of the intermediate plate. By applying welding with a small processing load without applying machining to the inner surface of the outer plate and the inner surface of the intermediate plate, the concave shape that surrounds and supports the bushing protruding end is formed between the outer plate and the inner plate. Since it can be formed between the intermediate plate and the inner plate, an increase in the chain manufacturing burden can be avoided.

Also, the first bushing shaft support collar and the second bushing shaft support collar are arranged with a gap between the bushes, so that the space between the outer plate and the inner plate and the inner plate and the inner plate are increased. Compared to a conventional multi-row chain in which a seal member is disposed in a pressed state between the plates, disassembly and assembly work such as chain cut-off can be easily achieved, and a smooth chain bending motion during chain operation can be realized.
Further, in the conventional multi-row chain, in order to prevent the sliding contact wear of the seal member and maintain the sealing performance of the lubricating oil, the inner surface of the outer plate, the inner surface of the intermediate plate, The outer surface of the plate had to be surface-finished to reduce the surface roughness, but the oil-free multi-row chain of the present invention does not need to be surface-finished as in the past, reducing the chain manufacturing burden. Can be reduced.

  In the present invention, an inner link unit formed by press-fitting a pair of front and rear bushes to a pair of left and right inner plates is arranged in parallel via two intermediate plates in the chain width direction, and the inner link unit has a chain width. A plurality of connecting pins that are press-fitted into a pair of front and rear pin holes of the outer plate arranged on the outermost side in the direction are connected in the longitudinal direction of the chain, and between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin In an oil-free multi-row chain in which lubricating oil is sealed, a first oil sump labyrinth structure forming member that seals lubricating oil on the outer plate side is provided on the inner side surface of the outer plate and the inner plate facing the outer plate. A second oil sump labyrinth structure forming member that is disposed between the outer side surface and seals lubricating oil on the intermediate plate side is opposed to the inner side surface of the intermediate plate and the intermediate plate. The outer peripheral surface of the connecting pin and the inner periphery of the bushing are arranged between the outer surface of the inner plate and the outer peripheral surface of the bushing without increasing the chain manufacturing burden and preventing leakage of lubricating oil and intrusion of external dust during chain operation. Any specific embodiment may be used as long as the sliding contact wear with the surface is suppressed and the disassembly / assembly work load such as chain cutting is simple.

That is, the specific shapes of the inner plate, outer plate, and intermediate plate used in the oil-free multi-row chain of the present invention may be either an oval type or a gourd type.
In the oil-free multi-row chain of the present invention, the number of inner link units arranged in parallel in the chain width direction is usually two to three rows, but may be more than that.
Furthermore, the non-lubricated multi-row chain of the present invention may be either a bush chain or a roller chain, but in the case of a bush chain, the power transmission speed is relatively slow and the chain is loaded. This is optimal for power transmission with a small load. In the case of a roller chain, the meshing with the sprocket becomes smooth, so that wear of the chain can be prevented.

  In addition, as for the specific assembly mode of the intermediate plate incorporated in the oil-free multi-row chain of the present invention, the connection pin is press-fitted into the pin hole of the intermediate plate, so-called so-called “similar fit”, The pin can be loosely fitted to the pin hole of the intermediate plate, so-called so-called clearance fit, or the like, but the connection pin is press-fitted to the pin hole of the intermediate plate. When it is adopted, the chain strength can be improved, the lubricating oil can be prevented from leaking outside between the two intermediate plates, and the connecting pin can be loosely fitted into the pin hole of the intermediate plate. When it is adopted, it is not necessary to process the pin hole diameter of the intermediate plate and the pin diameter of the connecting pin with high precision, so disassembly and assembly work such as chain cut-off can be easily achieved. .

  Moreover, about the specific aspect of the intermediate | middle plate integrated in the oil-free multi-row chain of this invention, in order to avoid the strength fall of a chain, it is preferable to form with the same shape as an outer plate and an inner plate.

In addition, regarding a specific aspect of the bush incorporated in the oil-free multi-row chain of the present invention, a cylindrical shape that is generally adopted, or metal powder so that there are innumerable pores inside this cylindrical shape It may be any one made of a sintered oil-impregnated metal material in which a porous material obtained by compression molding and sintering at a temperature below the melting point is impregnated with a lubricating oil. For those molded from metal materials, the sintering density of the sintered oil-impregnated metal material and the specific type and combination of the metal powder as the raw material thereof may be any, especially the sintered oil-impregnated metal. molding material, iron, copper, nickel, by sintering at a sintering density of 6.0g ^/ cm ³ ~7.0g ^/ cm 3 with compressed form the mixed metal powder obtained by blending such as chromium molybdenum steel Where The bushing has toughness to receive shearing force and impact force due to chain tension, and the oil-impregnating performance and gradual supply of lubricating oil between the connecting pin and the bushing for a long period of time by impregnating with a lot of lubricating oil. Combines both release performance in a well-balanced manner.

  In addition, specific types of lubricating oil used in the oil-free multi-row chain of the present invention include lubricity such as a lubricating oil formed by blending polytetrafluoroethylene with poly-α-olefin, polyol ester, fluorine-bonded oil, Any material can be used as long as it has resistance to deterioration, and particularly when a synthetic oil based on a synthetic hydrocarbon such as poly-α-olefin or polyol ester is employed, it has excellent viscosity and lubrication. Exhibits resistance and deterioration resistance, and can bleed out between the connecting pin and the bushing over a long period of time without causing clogging of the pores formed inside the bushing, thereby suppressing sliding contact wear. .

  Also, an oil sump groove for supplying lubricating oil between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin is the outer peripheral surface of the connecting pin, the inner peripheral surface of the bush, or the outer peripheral surface of the connecting pin and the bush. When engraved on the inner peripheral surface, a larger amount of lubricating oil is enclosed and the lubricating oil is continuously supplied between the connecting pin and the bushing, so the outer peripheral surface of the connecting pin and the inner peripheral surface of the bushing. The sliding wear can be reduced over a long period of time and chain wear elongation can be further prevented.

Hereinafter, an oil-free multi-row chain 100 according to a first embodiment of the present invention will be described with reference to the drawings.
Here, FIG. 1 is an overall schematic diagram of the oil-free multi-row chain according to the first embodiment of the present invention, and FIG. 2 is a perspective view showing a connected state of the oil-free multi-row chain shown in FIG. 3 is a partial cross-sectional view of the oil-free multi-row chain shown in FIG.

First, an oil-free multi-row chain 100 according to the first embodiment of the present invention is a chain that is used to transmit a large amount of power. As shown in FIGS. Two sets of inner link units 140 formed by press-fitting a pair of front and rear bushes 130 that are rotatably fitted with a pair of front and rear rollers 120 are arranged in parallel via two intermediate plates 150 arranged adjacent to each other in the chain width direction. In addition, a large number of such inner link units 140 are connected in the longitudinal direction of the chain by a pair of front and rear connection pins 170 that are press-fitted into a pair of front and rear pin holes of the outer plate 160 disposed on the outermost side in the chain width direction. Has been.
Lubricating oil is sealed between the inner peripheral surface of the bush 130 and the outer peripheral surface of the connecting pin 170.

  Further, the intermediate plate 150 described above is press-fitted into the connecting pin 170 through a pin hole, thereby improving the chain strength and preventing the lubricating oil from leaking from between the two intermediate plates 150. It is like that.

Therefore, specific forms of the bush 130, the disc 180 with the first lip, and the disc 190 with the second lip, which are the most characteristic features of the oil-free multi-row chain 100 of this embodiment, will be described in detail with reference to FIGS.
First, the first lip-equipped disk 180 as the first oil sump labyrinth structure forming member is fitted and fixed to the connecting pin 170 so that the inner surface of the outer plate 160 faces the outer surface of the inner plate 110 facing the outer plate 160. The first disk main body 181 interposed between the first disk main body 181 and the first lip 182 standing from the outer peripheral edge of the first disk main body 181 toward the outer surface of the inner plate 110.
The bush protruding end 131 partially protruding from the outer surface of the inner plate 110 is surrounded and supported by the first lip disk 180 so that the first lip disk 180 and the bush protruding end 131 are spaced from each other. labyrinth structure L ₁ is formed for the first oil sump.

On the other hand, a disc 190 with a second lip serving as a second oil sump labyrinth structure forming member is fitted and fixed to the connecting pin 170 and the inner surface of the intermediate plate 150 and the outer surface of the inner plate 110 facing the intermediate plate 150. And a second lip portion 192 standing from the outer peripheral edge of the second disc main body portion 191 toward the outer surface of the inner plate 110.
The bush protruding end portion 131 partially protruding from the outer surface of the inner plate 110 is surrounded and supported by the second lip disk 190 so that the second lip disk 190 and the bush protruding end portion 131 are not supported. , labyrinth structure L ₂ is formed for the second oil sump.

The “inner side surface of the inner plate 110” in the oil-free multi-row chain 100 of the present invention means a side surface facing the inner side of the incorporated inner link unit 140, and “ The “outer side surface” means a side surface facing the outside of the incorporated inner link unit 140.
The “inner side surface of the outer plate 160” in the oil-free multi-row chain 100 of the present invention means a side surface facing the inner side of the chain, and the “outer side surface of the outer plate 160” It means the side facing the outside of the chain.
In addition, the “inner side surface of the intermediate plate 150” in the oil-free multi-row chain 100 of the present invention means a side surface facing the inner link unit 140 closest to the outer side, The “side surface” means a side surface facing the adjacently arranged intermediate plate 150 side.

The oil-free multi-row chain 100 of the present embodiment obtained in this way has the first labyrinth structure L ₁ for oil sump formed between the disk 180 with the first lip and the bush protruding end 131 and the second _one . The labyrinth structure L ₂ for second oil sump formed between the disc 190 with a lip and the bushing protruding end portion 131 exhibits an oil sump function due to a complicatedly bent shape, and by the circular running during chain running Since the external leakage of the lubricating oil enclosed between the inner peripheral surface of the bush 130 and the outer peripheral surface of the connecting pin 170 due to the generated centrifugal force and the like is suppressed and the intrusion of external dust is suppressed, the inner periphery of the bush 130 It is possible to reduce wear damage between the surface and the outer peripheral surface of the connecting pin 170 and prevent chain wear elongation over a long period of time.

  In addition, the disc 180 with the first lip is disposed between the inner surface of the outer plate 160 and the outer surface of the inner plate 110, and the disk 190 with the second lip is disposed outside the inner surface of the intermediate plate 150 and the inner plate 110. The bushing protruding end 131 is surrounded and supported without being subjected to machining such as grinding and milling with a heavy processing load on the inner surface of the outer plate 160 and the inner surface of the intermediate plate 150. Since the concave shape to be formed can be formed between the outer plate 160 and the inner plate 110 and between the intermediate plate 150 and the inner plate 110, an increase in chain manufacturing burden can be avoided.

  Further, by arranging the disc 180 with the first lip and the disc 190 with the second lip with a gap provided between the bushes 130, the intermediate plate and the inner plate are provided between the outer plate and the inner plate. Compared with the conventional multi-row chain in which the seal member is disposed in a pressed state between the two, it is possible to easily achieve the disassembly and assembling work such as chain cut-off, and to realize a smooth chain bending motion when the chain is in operation.

  Further, in the conventional multi-row chain, in order to prevent the sliding contact wear of the seal member and maintain the sealing performance of the lubricating oil, the inner surface of the outer plate, the inner surface of the intermediate plate, Although it is necessary to perform surface finishing processing to reduce the surface roughness on the outer surface of the plate, the oil-free multi-row chain 100 of the present invention does not need to be subjected to surface finishing processing as in the prior art, and the manufacturing burden of the chain Can be reduced.

  Since the intermediate plate 150 is press-fitted into the connecting pin 170 via the pin holes, the chain strength can be improved and the lubricating oil can be prevented from leaking from between the two intermediate plates 150. The effect is enormous.

In the present embodiment, as described above, the bushing protruding end portion 131 having a cylindrical shape in which no processing is applied to the end portion is used. However, as shown in FIG. A bushing protruding end portion 131a having a concave groove formed on the end surface, a bushing protruding end portion 131b having a band-shaped annular concave groove formed on the end surface as shown in FIG. 5, and an end portion so as to exhibit a curved state as shown in FIG. There is no problem even if the bushing protruding end portion 131c or the like is used.
When these bushing projecting end portions 131a, 131b, and 131c are employed, the first oil sump labyrinth structure L formed between the bushing projecting end portions 131a, 131b, and 131c and the first lip-equipped disk 180, respectively. ₁ and bushing projecting end 131a, 131b, so exhibit respectively 131c and a structure in which the second oil sump labyrinth structure _{L 2} is more complex bent formed between the second lipped disk 190, connected to the bushing 130 In addition to further suppressing external leakage of the lubricating oil sealed between the pins 170 and further suppressing the intrusion of external dust, the bush protruding end portions 131a and 131b shown in FIG. The annular groove or strip-shaped annular groove formed in the end face respectively functions as the annular oil reservoir regions Sa and Sb. Te, since suppressing the momentum of the lubricating oil to be Daso bleeding, it is possible to further improve the sealing effect.

In this embodiment, as described above, only the first lip-equipped disk 180 is provided between the inner surface of the outer plate 160 and the outer surface of the inner plate 110 facing the outer plate 160 as the first oil sump. The labyrinth structure forming member is interposed, but as shown in FIG. 7, the third lip disc 180 a surrounding the first lip portion 182 of the first lip disc 180, that is, the bush protruding end portion 131 is provided. A third disc body 181a that is externally fixed and is interposed between the first lip portion 182 of the disc 180 with the first lip and the outer surface of the inner plate 110, and the outer plate from the outer peripheral edge of the first disc body 181a. A disc with a third lip 180a composed of a third lip portion 182a standing on the inner surface of 160 is used as a disc with a first lip. 80 with no problem even by using a labyrinth structure forming member for the first oil sump.
In this case, the first oil sump labyrinth structure L ₁ formed between the inner side surface of the outer plate 160 and the outer side surface of the inner plate 110 facing the outer plate 160 exhibits a more complicated bent structure. Therefore, it is possible to further suppress external leakage of the lubricating oil sealed between the bush 130 and the connecting pin 170 and further suppress the entry of external dust.

Similarly, in the present embodiment, as described above, only the disk 190 with the second lip is placed between the inner surface of the intermediate plate 150 and the outer surface of the inner plate 110 facing the intermediate plate 150 with the second oil. Although interposing as a labyrinth structure forming member for pooling, it is externally fixed to a disk with a fourth lip (not shown) that surrounds and supports the second lip 192 of the disk 190 with a second lip, that is, a bushing protruding end 131. A fourth disc main body (not shown) interposed between the second lip 192 of the disc 190 with the second lip and the outer surface of the inner plate 110, and the intermediate plate 150 from the outer periphery of the fourth disc main body. A disc with a fourth lip composed of a fourth lip portion (not shown) standing toward the inner surface of the disc and a disc with a second lip 190 No problem be used as the second oil sump labyrinth structure formation member.
In this case, the second oil sump labyrinth structure L ₂ formed between the inner side surface of the intermediate plate 150 and the outer side surface of the inner plate 110 facing the intermediate plate 150 exhibits a more complicated bent structure. Therefore, it is possible to further suppress external leakage of the lubricating oil sealed between the bush 130 and the connecting pin 170 and further suppress the entry of external dust.

Next, an oil-free multi-row chain 200 according to a second embodiment of the present invention will be described with reference to FIGS.
First, an oil-free multi-row chain 200 according to the second embodiment of the present invention is a chain used to transmit a large amount of power. As shown in FIG. 8 and FIG. Two sets of inner link units 240 formed by press-fitting a pair of front and rear bushes 230 externally fitted with a pair of front and rear rollers 220 are arranged in parallel via two intermediate plates 250 arranged adjacent to each other in the chain width direction. In addition, a large number of such inner link units 240 are connected in the longitudinal direction of the chain by a pair of front and rear connection pins 270 that are press-fitted into a pair of front and rear pin holes of the outer plate 260 arranged on the outermost side in the chain width direction. Has been.
And between the inner peripheral surface of the bush 230 and the outer peripheral surface of the connection pin 270, lubricating oil is enclosed.

  Further, the intermediate plate 250 is press-fitted to the connecting pin 270 through a pin hole, thereby improving the chain strength and preventing the lubricating oil from leaking to the outside from between the two intermediate plates 250. It is like that.

Therefore, specific forms of the bush 230, the first flanged sleeve 280, and the second flanged sleeve 290, which are the most characteristic features of the oil-free multi-row chain 200 of this embodiment, will be described in detail with reference to FIGS.
First, a first flanged sleeve 280 as a first oil sump labyrinth structure forming member is fitted to the connecting pin 270 and is interposed between the connecting pin 270 and the bushing 230, A first flange portion 282 extending between the inner surface of the outer plate 260 and the outer surface of the inner plate 210 from the end of the first sleeve main body portion 281, and the inner periphery from the outer peripheral edge of the first flange portion 282 The first lip portion 283 is formed to stand toward the outer surface of the plate 210.
The bushing protruding end portion 231 that partially protrudes from the outer surface of the inner plate 210 is surrounded and supported by the first flanged sleeve 280, so that the first flanged sleeve 280 and the bushing protruding end portion 231 are interposed between each other. labyrinth structure L ₁ is formed for the first oil sump.

On the other hand, the second flanged sleeve 290 as the second oil sump labyrinth structure forming member is fitted to the connecting pin 270 and is interposed between the connecting pin 270 and the bushing 230, A second flange portion 292 extending between the inner surface of the intermediate plate 250 and the outer surface of the inner plate 210 from the end portion of the second sleeve main body portion 291 and the inner periphery from the outer peripheral edge of the second flange portion 292. The second lip portion 293 is formed to stand toward the outer surface of the plate 210.
The bushing protruding end portion 231 that partially protrudes from the outer surface of the inner plate 210 is surrounded and supported by the second flanged sleeve 290 so that the second flanged sleeve 290 and the bushing protruding end portion 231 are interposed between each other. , labyrinth structure L ₂ is formed for the second oil sump.

  Between the outer peripheral surface of the connecting pin 270, the inner peripheral surface of the bush 230, the first sleeve main body 281 of the first flanged sleeve 280, and the second sleeve main body 291 of the second flanged sleeve 290, there is an annular shape. An oil reservoir P is formed, and a large amount of lubricating oil can be enclosed in the annular oil reservoir P.

The “inner side surface of the inner plate 210” in the oil-free multi-row chain 200 of the present invention means a side surface facing the inner side of the incorporated inner link unit 240, and “ The “outer side surface” means a side surface facing the outside of the incorporated inner link unit 240.
The “inner side surface of the outer plate 260” in the oil-free multi-row chain 200 of the present invention means a side surface facing the inner side of the chain, and the “outer side surface of the outer plate 260” It means the side facing the outside of the chain.
Further, the “inner side surface of the intermediate plate 250” in the oil-free multi-row chain 200 of the present invention means a side surface facing the inner link unit 240 closest to the outer side, The “side surface” means a side surface facing the adjacently arranged intermediate plate 250 side.

The oil-free multi-row chain 200 of the present embodiment obtained in this way has the first labyrinth structure L ₁ for oil sump formed between the sleeve 280 with the first flange and the bushing protruding end 231 and the second the second oil reservoir labyrinth structure L ₂ formed between the flanged sleeve 290 and the bushing projecting end portion 231, to demonstrate the oil reservoir function by a complex bending shape, the circumferential travel when the chain is running Since the external leakage of the lubricating oil enclosed between the inner peripheral surface of the bushing 230 and the outer peripheral surface of the connecting pin 270 due to the generated centrifugal force and the like is suppressed and the intrusion of external dust is suppressed, the inner periphery of the bushing 230 The wear damage between the surface and the outer peripheral surface of the connecting pin 270 can be reduced, and chain wear elongation can be prevented over a long period of time.

  Further, an annular oil sump is provided between the outer peripheral surface of the connecting pin 270, the inner peripheral surface of the bush 230, and the first sleeve main body 281 of the first flanged sleeve 280 and the second sleeve main body 291 of the second flanged sleeve 290. Since the portion P is generated and a large amount of lubricating oil can be sealed in the annular oil reservoir P, the outer peripheral surface of the first sleeve main body 281 of the sleeve 280 with the first flange and the sleeve 290 with the second flange are provided. The lubricating oil can be continuously supplied between the outer peripheral surface of the second sleeve main body portion 291 and the inner peripheral surface of the bushing 230 to reduce the wear elongation of the chain over a long period of time. Is wider than the oil sump area formed between the outer peripheral surface of the connecting pin and the inner peripheral surface of the bush in the conventional multi-row chain, so that a lubricant other than liquid, for example, a powdered lubricant, a solid Lubricant, can be encapsulated lubricant over many types of grease.

  Further, since the first flanged sleeve 280 and the second flanged sleeve 290 are externally fitted to the connecting pin 270, the first flanged sleeve 280, the second flanged sleeve 290, and the bushing 230 are used as bearings. Since the connecting pin 270 does not need to have wear resistance and only has toughness to receive shearing force and impact force due to chain tension, the toughness of the connecting pin 270 is configured. It is possible to maximize the sex.

  The first flange portion 282 and the first lip portion 283 of the first flanged sleeve 280 are disposed between the inner surface of the outer plate 260 and the outer surface of the inner plate 210 and the second flanged sleeve 290 is disposed. By disposing the second flange portion 292 and the second lip portion 293 between the inner side surface of the intermediate plate 250 and the outer side surface of the inner plate 210, the outer plate can perform machining such as grinding and milling with a heavy processing load. A recess shape that surrounds and supports the bushing protruding end 231 is formed between the outer plate 260 and the inner plate 210 and between the intermediate plate 250 and the inner plate 210 without being applied to the inner surface of the 260 and the inner surface of the intermediate plate 250. Since it can be formed, an increase in chain manufacturing burden can be avoided.

  Further, the first flanged sleeve 280 and the second flanged sleeve 290 are disposed with a gap between the bushing 230, so that the intermediate plate and the inner plate are interposed between the outer plate and the inner plate. Compared with the conventional multi-row chain in which the seal member is disposed in a pressed state between the two, it is possible to easily achieve the disassembly and assembling work such as chain cut-off, and to realize a smooth chain bending motion when the chain is in operation.

  Further, in the conventional multi-row chain, in order to prevent the sliding contact wear of the seal member and maintain the sealing performance of the lubricating oil, the inner surface of the outer plate, the inner surface of the intermediate plate, Although it is necessary to perform a surface finishing process to reduce the surface roughness on the outer surface of the plate, the oil-free multi-row chain 200 of the present invention does not need to be subjected to a surface finishing process as in the prior art, and the manufacturing burden of the chain Can be reduced.

  Since the intermediate plate 250 is press-fitted into the connecting pin 270 via the pin hole, the chain strength can be improved and the lubricating oil can be prevented from leaking from between the two intermediate plates 250. The effect is enormous.

Next, an oil-free multi-row chain 300 according to a third embodiment of the present invention will be described with reference to FIGS.
First, an oil-free multi-row chain 300 according to a third embodiment of the present invention is a chain used to transmit a large amount of power. As shown in FIG. 10 and FIG. Two sets of inner link units 340 formed by press-fitting a pair of front and rear bushes 330 externally fitted with a pair of front and rear rollers 320 are arranged in parallel via two intermediate plates 350 arranged adjacent to each other in the chain width direction. In addition, a large number of such inner link units 340 are connected in the longitudinal direction of the chain by a pair of front and rear connection pins 370 that are press-fitted into a pair of front and rear pin holes of the outer plate 360 arranged on the outermost side in the chain width direction. Has been.
Lubricating oil is sealed between the inner peripheral surface of the bush 330 and the outer peripheral surface of the connecting pin 370.

  Further, the intermediate plate 350 described above is press-fitted into the connecting pin 370 through a pin hole, thereby improving the chain strength and preventing the lubricating oil from leaking from between the two intermediate plates 350. It is like that.

10 and FIG. 10 show specific forms of the inner plate 310, the intermediate plate 350, the outer plate 360, the first seal ring 380, and the second seal ring 390, which are the most characteristic features of the oil-free multi-row chain 300 of the present embodiment. 11 will be described in detail.
First, the first seal ring 380 as the first oil sump labyrinth structure forming member is concentric with the connecting pin 370 on the inner surface of the outer plate 360 and the outer surface of the inner plate 310 facing the outer plate 360, respectively. The first oil retaining labyrinth structure L is provided between the first ring retaining grooves 311 and 361 and the first seal ring 380 as a result. ₁ is formed.
An annular oil reservoir region S is formed between the outer peripheral surface of the connecting pin 370, the inner surface of the outer plate 360, the outer surface of the inner plate 310, and the inner peripheral surface of the first seal ring 380. The momentum of the lubricating oil that the annular oil reservoir region S is about to ooze out is suppressed.

On the other hand, the second seal ring 390 as the second oil sump labyrinth structure forming member is concentric with the connecting pin 370 on the inner surface of the intermediate plate 350 and the outer surface of the inner plate 310 facing the intermediate plate 350, respectively. The second ring holding grooves 312 and 351 are loosely fitted and held. As a result, the second oil sump labyrinth structure L is provided between the second ring holding grooves 312 and 351 and the second seal ring 390. ₂ is formed.
An annular oil reservoir region S is formed between the outer peripheral surface of the connecting pin 370, the inner surface of the intermediate plate 350, the outer surface of the inner plate 310, and the inner peripheral surface of the second seal ring 390. The momentum of the lubricating oil that the annular oil reservoir region S is about to ooze out is suppressed.

The “inner side surface of the inner plate 310” in the oil-free multi-row chain 300 of the present invention means a side surface facing the inner side of the incorporated inner link unit 340, and “ The “outer side surface” means a side surface facing the outside of the incorporated inner link unit 340.
The “inner side surface of the outer plate 360” in the oil-free multi-row chain 300 of the present invention means a side surface facing the inner side of the chain, and the “outer side surface of the outer plate 360” It means the side facing the outside of the chain.
The “inner side surface of the intermediate plate 350” in the oil-free multi-row chain 300 of the present invention means the side surface facing the closest inner link unit 340 side, The “side surface” means a side surface facing the adjacently arranged intermediate plate 350 side.

Thus the oil-free multi-row chain 300 of the present embodiment thus obtained has a first ring holding groove 311,361 and the first oil sump labyrinth structure L _1, which is formed between the first seal ring 380 a second ring holding groove 312,351 and labyrinth structure L ₂ for the second oil sump formed between the second seal ring 390, to demonstrate the oil reservoir function by a complex bending shape, when the chain is running Since the leakage of the lubricating oil enclosed between the inner peripheral surface of the bush 330 and the outer peripheral surface of the connecting pin 370 due to the centrifugal force generated by the circular travel of the outer periphery is suppressed and the intrusion of the external dust is suppressed, the bush The wear damage of the inner peripheral surface of 330 and the outer peripheral surface of the connecting pin 370 can be reduced, and chain wear elongation can be prevented for a long time. Also, the outer peripheral surface of the connecting pin 370 and the inner surface of the outer plate 360 Between the outer surface of the plate 310 and the inner peripheral surface of the first seal ring 380, and the outer peripheral surface of the connecting pin 370, the inner surface of the intermediate plate 350, the outer surface of the inner plate 310, and the inner periphery of the second seal ring 390. Lubricating oil is stored in the annular oil reservoir region S formed between the two surfaces, and the momentum of the lubricating oil from which the annular oil reservoir region S tends to exude is suppressed, so that the sealing effect can be further improved. .

  Further, the first seal ring 380 is loosely fitted and held in the first ring holding grooves 311 and 361 and the second seal ring 390 is loosely fitted and held in the second ring holding grooves 312 and 351. Compared to a conventional multi-row chain with a sealing member placed between the inner plate and the inner plate and between the intermediate plate and the inner plate in a pressed state, disassembly and assembly work such as chain cut-off can be easily achieved and the chain can be operated. Smooth chain bending movement can be realized.

Further, in the conventional multi-row chain, in order to prevent sliding contact wear of the seal member and maintain the sealing performance of the lubricating oil, the inner surface of the outer plate, the inner surface of the intermediate plate, Although it is necessary to perform surface finishing processing to reduce the surface roughness on the outer surface of the plate, the oil-free multi-row chain 300 of the present invention does not need to be subjected to surface finishing processing as in the past, and the manufacturing burden of the chain Can be reduced.
In the conventional multi-row chain, an installation space for forming a seal member such as an O-ring is required between the outer plate and the inner plate and between the intermediate plate and the inner plate. Since the row chain 300 is designed with the same dimension in the chain width direction as that of a normal standard multi-row chain without requiring a space for installing a seal member as in the conventional case, the multi-chain chain having a normal horizontal pitch as specified. A sprocket for a chain (not shown), that is, a sprocket for a multi-row chain in which the sprocket teeth are arranged in parallel in the sprocket thickness direction at regular arrangement intervals, can be applied.

  Since the intermediate plate 350 is press-fitted into the connecting pin 370 through the pin hole, the chain strength can be improved and the lubricating oil can be prevented from leaking from between the two intermediate plates 350. The effect is enormous.

In this embodiment, as described above, only the first seal ring 380 is used for the first oil reservoir between the inner surface of the outer plate 360 and the outer surface of the inner plate 310 facing the outer plate 360. As shown in FIG. 12, the third ring holding groove having a larger diameter than the first ring holding grooves 311 and 361 on the inner side surface of the outer plate 360a and the outer side surface of the inner plate 310a is interposed as a labyrinth structure forming member. 311a and 361a are provided concentrically with the first ring holding grooves 311 and 361, respectively, and the third seal ring 380a is loosely fitted in the third ring holding grooves 311a and 361a. The first seal ring 380 and the first oil sump labyrinth structure forming member may be used.
In this case, exhibits a structure for the first oil sump labyrinth structure L ₁ is more complex bent formed between the outer surface of the plate 310a that faces the inner surface and the outer plate 360a of the outer plate 360a Therefore, it is possible to further suppress the external leakage of the lubricating oil sealed between the bush 330 and the connecting pin 370 and further suppress the intrusion of external dust. Further, the inner surface of the outer plate 360a and the outer surface of the inner plate 310a Since the annular oil reservoir region Sa is formed between the outer peripheral surface of the first seal ring 380 and the inner peripheral surface of the third seal ring 380a, the momentum of the lubricating oil that the annular oil reservoir region Sa tends to ooze out is increased. It can suppress and can further improve a sealing effect.

Similarly, in the present embodiment, as described above, only the second seal ring 390 is provided between the inner surface of the intermediate plate 350 and the outer surface of the inner plate 310 facing the intermediate plate 350 as the second oil reservoir. A fourth ring holding groove (not shown) having a diameter larger than that of the second ring holding grooves 312 and 351 is formed on the inner side surface of the intermediate plate 350 and the outer side surface of the inner plate 310. Concentric with the two ring retaining grooves 312, 351, and recessed, and a fourth seal ring (not shown) is loosely fitted into the fourth ring retaining groove, so that the fourth seal ring and the second seal ring 390 are fitted together. Even if it is used as the labyrinth structure forming member for the second oil reservoir, there is no problem.
In this case, exhibits a structure in which a labyrinth structure L ₂ for the second oil reservoir and further complicatedly bent formed between the inner and outer surfaces of the plate 310 which faces the intermediate plate 350 of the intermediate plate 350 Therefore, it is possible to further suppress the external leakage of the lubricating oil sealed between the bush 330 and the connecting pin 370 and further suppress the intrusion of external dust. Further, the inner surface of the intermediate plate 350 and the outer surface of the inner plate 310 Since an annular oil reservoir region is formed between the outer peripheral surface of the second seal ring 390 and the inner peripheral surface of the fourth seal ring, the momentum of the lubricating oil that the annular oil reservoir region tends to exude is suppressed. The sealing effect can be further improved.

Next, an oil-free multi-row chain 400 according to a fourth embodiment of the present invention will be described with reference to FIGS.
First, an oil-free multi-row chain 400 according to the fourth embodiment of the present invention is a chain used for transmitting a large amount of power. As shown in FIGS. Two sets of inner link units 440 formed by press-fitting a pair of front and rear bushes 430 having a pair of front and rear rollers 420 rotatably fitted thereto are arranged in parallel via two intermediate plates 450 arranged adjacent to each other in the chain width direction. In addition, a large number of such inner link units 440 are connected in the longitudinal direction of the chain by a pair of front and rear connection pins 470 that are press-fitted into a pair of front and rear pin holes of the outer plate 460 disposed on the outermost side in the chain width direction. Has been.
Lubricating oil is sealed between the inner peripheral surface of the bush 430 and the outer peripheral surface of the connecting pin 470.

  Further, the intermediate plate 450 described above is press-fitted into the connecting pin 470 through a pin hole, thereby improving the chain strength and preventing the lubricating oil from leaking out between the two intermediate plates 450. It is like that.

Therefore, specific forms of the bushing 430, the first bushing shaft support collar 480, and the second bushing shaft support collar 490, which are the most characteristic features of the oil-free multi-row chain 400 of this embodiment, are described in more detail with reference to FIGS. explain.
First, the first bushing shaft support collar 480 as the first oil sump labyrinth structure forming member is fixed so as to protrude from the inner surface of the outer plate 460 toward the outer surface of the inner plate 410.
The bushing protruding end portion 431 that partially protrudes from the outer surface of the inner plate 410 is surrounded and supported by the first bushing shaft supporting collar 480, so that the first bushing shaft supporting collar 480, the bushing protruding end portion 431, between the labyrinth structure L ₁ is formed for the first oil sump.

On the other hand, the second bushing shaft support collar 490 as the second oil sump labyrinth structure forming member is fixed so as to protrude from the inner surface of the intermediate plate 450 toward the outer surface of the inner plate 410.
The bushing protruding end portion 431 partially protruding from the outer surface of the inner plate 410 is surrounded and supported by the second bushing shaft supporting collar 490, so that the second bushing shaft supporting collar 490, the bushing protruding end portion 431, between the labyrinth structure L ₂ is formed for the second oil sump.

The “inner surface of the inner plate 410” in the oil-free multi-row chain 400 of the present invention means a side surface facing the inner side of the incorporated inner link unit 440, and “ The “outer side surface” means a side surface facing the outside of the incorporated inner link unit 440.
The “inner side surface of the outer plate 460” in the oil-free multi-row chain 400 of the present invention means a side surface facing the inner side of the chain, and the “outer side surface of the outer plate 460” It means the side facing the outside of the chain.
The “inner surface of the intermediate plate 450” in the oil-free multi-row chain 400 of the present invention means a side surface facing the closest inner link unit 440 side, The “side surface” means a side surface facing the adjacently arranged intermediate plate 450 side.

Thus the oil-free multi-row chain 400 of the present embodiment thus obtained has a first oil sump labyrinth structure L _1, which is formed between the first bushing axis journaling collar 480 and the bushing projecting end portion 431 a labyrinth structure L ₂ for the second oil sump formed between the second bushing axis journaling collar 490 and the bushing projecting end portion 431, to demonstrate the oil reservoir function by a complex bending shape, when the chain is running Since the leakage of the lubricating oil enclosed between the inner peripheral surface of the bushing 430 and the outer peripheral surface of the connecting pin 470 due to the centrifugal force generated by the circular travel of the shaft is suppressed and the intrusion of external dust is suppressed. Wear damage on the inner peripheral surface of 430 and the outer peripheral surface of the connecting pin 470 can be reduced, and chain wear elongation can be prevented over a long period of time.

  Further, since the first bushing shaft support collar 480 is fixed to the inner side surface of the outer plate 460 and the second bushing shaft support collar 490 is fixed to the inner side surface of the intermediate plate 450, the processing load is large. A recess shape that surrounds and supports the bushing protruding end portion 431 is formed between and between the outer plate 460 and the inner plate 410 without performing machining such as grinding and milling on the inner surface of the outer plate 460 and the inner surface of the intermediate plate 450. Since it can be formed between the plate 450 and the inner plate 410, an increase in chain manufacturing burden can be avoided.

  In addition, the first bushing shaft support collar 480 and the second bushing shaft support collar 490 are disposed with a gap between the bushings 430, so that the space between the outer plate and the inner plate is intermediate. Compared to a conventional multi-row chain in which a seal member is placed in a pressed state between the plate and the inner plate, disassembly and assembly work such as chain cut-off can be easily achieved, and smooth chain bending movement during chain operation realizable.

  Further, in the conventional multi-row chain, in order to prevent the sliding contact wear of the seal member and maintain the sealing performance of the lubricating oil, the inner surface of the outer plate, the inner surface of the intermediate plate, Although it is necessary to perform surface finishing to reduce the surface roughness on the outer surface of the plate, the oil-free multi-row chain 400 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.

  Since the intermediate plate 450 is press-fitted into the connecting pin 470 via the pin hole, the chain strength can be improved and the lubricating oil can be prevented from leaking from between the two intermediate plates 450. The effect is enormous.

In the present embodiment, as described above, no processing is performed on the inner side surface of the inner plate 410 facing both end surfaces of the roller 420. However, as shown in FIG. There may be no problem even if it is designed so that both ends of the roller 420 are surrounded and supported by the roller shaft support collar 480a fixed so as to protrude toward the inside of the inner link unit 440 from the side surface.
In this case, so both ends and the roller shaft journaling oil reservoir labyrinth structure L ₃ which leakage path of the resulting lubricating oil exhibits intricately bent oil reservoir function between the color 480a of the roller 420, the chain running Since the leakage of the lubricating oil enclosed between the roller 420 and the bushing 430 due to the centrifugal force generated by the orbital traveling at the time is suppressed and the intrusion of external dust is suppressed, the conveyance object is supported during the chain traveling. In addition, it is possible to suppress wear damage and seizure on the inner peripheral surface of the roller 420 and the outer peripheral surface of the bushing 430, which support the chain that travels with them and have high sliding frequency and are likely to wear.

Furthermore, as shown in FIG. 16, there may be no problem even if a tapered guide surface 481a having a diameter reduced toward the inner side of the inner link unit 440 is formed on the roller shaft support collar 480a.
In this case, even when the chain is shifted in the chain width direction and the sprocket teeth (not shown) and the roller shaft support collar 480a are in contact with each other when the chain is in operation, the tapered guide surface 481a removes the sprocket teeth from the outer periphery of the roller 420. Since the guide is guided to the surface, it is possible to prevent the roller shaft support collar 480a from being caught by the sprocket teeth and damaging the chain balance in the chain width direction.

Further, as shown in FIG. 17, it is possible to design the roller small diameter portion 421 so as to protrude from both ends of the roller 420 and to support the roller small diameter portion 421 with the roller shaft support collar 480a.
In this case, even when the roller 420 having an outer diameter larger than the inner diameter of the roller shaft support collar 480a is used, the roller shaft support collar 480a can be fitted through the roller small diameter portion 421. A roller 420 having various outer diameters can be applied without being limited by the inner diameter of the support collar 480a, and the roller small diameter portion 421 is formed between the roller 420 and the inner plate 410. Since the generated outflow path of the lubricating oil has a more complicated bent shape, the sealing effect of the lubricating oil injected between the inner peripheral surface of the roller 420 and the outer peripheral surface of the bush 430 can be further improved. .

1 is an overall schematic diagram of an oil-free multi-row chain according to a first embodiment of the present invention. The perspective view which shows the connection state of the oil-free multi-row chain shown in FIG. The partial cross section figure of the oil-free multi-row chain shown in FIG. The partial cross section figure which shows the 1st modification of 1st execution example. The partial cross section figure which shows the 2nd modification of 1st Example. The partial cross section figure which shows the 3rd modification of 1st Example. The partial cross section figure which shows the 4th modification of 1st execution example. The perspective view which shows the connection state of the oil-free multi-row chain which is 2nd Example of this invention. FIG. 9 is a partial cross-sectional view of the oil-free multi-row chain shown in FIG. 8. The perspective view which shows the connection state of the oil-free multi-row chain which is 3rd Example of this invention. FIG. 11 is a partial cross-sectional view of the oil-free multi-row chain shown in FIG. 10. The partial cross section figure which shows the 1st modification of 3rd execution example. The perspective view which shows the connection state of the oil-free multi-row chain which is 4th Example of this invention. FIG. 14 is a partial cross-sectional view of the oil-free multi-row chain shown in FIG. 13. The partial cross section figure which shows the 1st modification of 4th execution example. The partial cross section figure which shows the 2nd modification of 4th Example. The partial sectional view showing the 3rd modification of the 4th example.

Explanation of symbols

100, 200, 300, 400 ... Oil-free multi-row chain 110, 210, 310, 410 ... Inner plate 120, 220, 320, 420 ... Roller 130, 230, 330, 430 ... Bush 131 , 331, 431 ... bushing projecting ends 140, 240, 340, 440 ... inner link units 150, 250, 350, 450 ... intermediate plates 160, 260, 360, 460 ... outer plates 170, 270, 370, 470 ... connecting pin 180 ... first disc with lip 181 ... first disc body 182 ... first lip portion 190 ... second disc with lip 191 ... first 2 disc body 192 ... second lip 280 ... first flanged sleeve 281 ... 1st sleeve main body part 282 ... 1st flange part 283 ... 1st lip part 290 ... 2nd sleeve sleeve with flange 291 ... 2nd sleeve main body part 292 ... 2nd flange part 293 ... 2nd lip part 311 ... Inner plate first ring retaining groove 312 ... Inner plate second ring retaining groove 351 ... Second ring holding groove 361 of intermediate plate ... First ring retaining groove 380 of outer plate ... First seal ring 390 ... Second seal ring 480 ... 1st bushing shaft support collar 490 ... 2nd bush support collar
L ₁ ... Labyrinth structure for first oil sump L ₂ ... Labyrinth structure for second oil sump
P ... Ripple oil reservoir
S: annular oil sump area

Claims (7)

An inner link unit formed by press-fitting a pair of front and rear bushes to a pair of left and right inner plates is arranged in parallel in the chain width direction via two intermediate plates, and the inner link unit is the most in the chain width direction. Lubricating oil is connected between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin by a large number of connecting pins in the longitudinal direction of the chain by a pair of front and rear connecting pins press-fitted into a pair of front and rear pin holes of the outer plate disposed on the outside. In the oil-free multi-row chain formed by enclosing
A labyrinth structure forming member for first oil sump that seals the lubricating oil on the outer plate side is disposed between the inner surface of the outer plate and the outer surface of the inner plate facing the outer plate,
A second oil sump labyrinth structure forming member for sealing the lubricating oil on the intermediate plate side is disposed between the inner side surface of the intermediate plate and the outer side surface of the inner plate facing the intermediate plate. Features an oil-free multi-row chain. The labyrinth structure forming member for the first oil sump is composed of a disk with a first lip that is disposed on the outer plate side and surrounds and supports a bushing protruding end portion that partially protrudes from the outer surface of the inner plate,
The second oil sump labyrinth structure forming member comprises a disk with a second lip that is disposed on the intermediate plate side and surrounds and supports a bushing protruding end portion that partially protrudes from the outer surface of the inner plate. The oil-free multi-row chain according to claim 1. The first disc body with the first lip is fitted on the connecting pin and interposed between the inner surface of the outer plate and the outer surface of the inner plate, and the inner periphery from the outer periphery of the first disk body portion. It is composed of a first lip portion that stands on the outer surface of the plate,
The second disc body with the second lip is fitted on the connecting pin and interposed between the inner side surface of the intermediate plate and the outer side surface of the inner plate, and from the outer peripheral edge of the second disc body portion. 3. The oil-free multi-row chain according to claim 2, wherein the oil-free multi-row chain is composed of a second lip portion that stands on the outer surface of the plate. The labyrinth structure forming member for the first oil sump comprises a sleeve with a first flange that is disposed on the outer plate side and surrounds and supports a bushing projecting end portion that partially projects from the outer surface of the inner plate,
The second oil sump labyrinth structure forming member includes a sleeve with a second flange that is disposed on the intermediate plate side and surrounds and supports a bushing protruding end portion that partially protrudes from the outer surface of the inner plate. The oil-free multi-row chain according to claim 1. The first flanged sleeve is externally fitted to the connecting pin and is interposed between the connecting pin and the bush, and the inner surface of the outer plate and the inner plate from the end of the first sleeve main body. The first flange portion that extends between the outer side surface and the first flange portion and the first lip portion that stands from the outer peripheral edge of the first flange portion toward the outer surface of the inner plate,
The second flanged sleeve is externally fitted to the connecting pin and interposed between the connecting pin and the bush, and from the end of the second sleeve main body, the inner surface of the intermediate plate and the inner plate A second flange portion extending between the outer side surface and the second flange portion, and a second lip portion standing from the outer peripheral edge of the second flange portion toward the outer side surface of the inner plate. The oil-free multi-row chain according to claim 4. A first seal ring in which the first oil sump labyrinth structure forming member is loosely fitted and held in a first ring holding groove concentrically formed with a connecting pin on an inner surface of the outer plate and an outer surface of the inner plate. And consisting of
A second seal ring in which the second oil sump labyrinth structure forming member is loosely fitted and held in a second ring holding groove concentrically formed with a connecting pin on the inner surface of the intermediate plate and the outer surface of the inner plate. The oil-free multi-row chain according to claim 1, comprising: The first oil sump labyrinth structure forming member is fixed so as to protrude from the inner surface of the outer plate toward the outer surface of the inner plate, and has a bushing protruding end portion that partially protrudes from the outer surface of the inner plate. It consists of a collar for the first bushing shaft that supports Go,
The second oil sump labyrinth structure forming member is fixed so as to protrude from the inner side surface of the intermediate plate toward the outer side surface of the inner plate, and has a bush protruding end portion partially protruding from the outer side surface of the inner plate. 2. The oil-free multi-row chain according to claim 1, comprising a collar for supporting the second bushing for supporting the go.

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