JP4232988B1 - Oil-free multi-row chain - Google Patents

Abstract

An oil-free multi-row chain that suppresses external leakage of lubricating oil and intrusion of external dust between adjacent intermediate plates and easily accomplishes disassembly and assembly of the chain.
An inner link unit 140 formed by press fitting a bush 130 to an inner plate 110 is arranged in parallel in the chain width direction via two intermediate plates 150, and the inner link unit 140 is the outermost side in the chain width direction. A plurality of connecting pins 170 press-fitted into the pin holes of the outer plate 160 arranged in the longitudinal direction of the chain, and the lubricating oil is sealed between the inner peripheral surface of the bush 130 and the outer peripheral surface of the connecting pin 170; The oil-free multi-row chain 100 in which the intermediate plate 150 is loosely fitted to the connecting pins 170 and the seal structure S that prevents leakage of the lubricating oil between the intermediate plates 150 is formed between adjacent intermediate plates 150.
[Selection] Figure 2

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).
Japanese Patent Laid-Open No. 11-132295 (see column 4, FIG. 11)

  However, in the conventional multi-row chain as described above, the connecting pin is press-fitted into the pin hole of the intermediate plate, so-called “similar fitting”, and the lubricating oil is attached to the outside from between the two adjacent intermediate plates. However, when disassembling and assembling such as chain cut-off, there is a problem that such a simplistic fitting operation between the intermediate plate and the connecting pin becomes troublesome and requires an excessive work load.

  Therefore, the present invention solves the conventional problem, that is, the object of the present invention is to provide an inner link unit in which a pair of front and rear bushes are press-fitted to a pair of left and right inner plates in the chain width direction. The inner link unit is 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 intermediate plate is loosely fitted. In an oil-free multi-row chain in which a large number of chains are connected in the longitudinal direction of a chain by a pair of front and rear connection pins and lubricating oil is sealed between the inner peripheral surface of the bush and the outer peripheral surface of the connection pin, It is possible to suppress the external leakage of lubricating oil and the intrusion of external dust, and to easily achieve the disassembly and assembly operation of the chain.

  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 connecting pins that are press-fitted into a pair of front and rear pin holes of the outer plate disposed on the outermost side in the chain width direction, and the intermediate plate is loosely fitted. An oil-free multi-row chain in which lubricating oil is enclosed between the inner peripheral surface of the outer peripheral surface of the connecting pin and the outer peripheral surface of the connecting pin, wherein the lubricating oil is applied to the outer surface of the outer plate and the inner surface of the outer plate facing the outer plate. The first labyrinth structure for oil sump that prevents leakage between the side surface and the bushing protruding end portion that partially protrudes from the outer surface of the inner plate bulges to the outer surface by recessing the inner surface of the outer plate. It is configured by surrounding and supporting by the annular recess for supporting the first bushing shaft in the fset state, and the lubricating oil is prevented from leaking between the inner surface of the intermediate plate and the outer surface of the inner plate facing the intermediate plate. The labyrinth structure for the second oil sump is press-fitted with the bearing cylindrical member straddling the pin hole so that the bush protruding end part that protrudes partly from the outer surface of the inner plate is recessed in the inner surface of the intermediate plate The above-described problem is solved by being surrounded and supported by the annular recess for supporting the second bushing shaft formed as described above.

  In the present invention according to claim 2, 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 connecting pins that are press-fitted into a pair of front and rear pin holes of the outer plate disposed on the outermost side in the chain width direction, and the intermediate plate is loosely fitted. An oil-free multi-row chain in which lubricating oil is enclosed between the inner peripheral surface of the outer peripheral surface of the connecting pin and the outer peripheral surface of the connecting pin, wherein the lubricating oil is applied to the outer surface of the outer plate and the inner surface of the outer plate facing the outer plate. The first labyrinth structure for oil sump that prevents leakage between the side surface and the bushing protruding end portion that partially protrudes from the outer surface of the inner plate bulges to the outer surface by recessing the inner surface of the outer plate. It is configured by surrounding and supporting by the annular recess for supporting the first bushing shaft in the fset state, and the lubricating oil is prevented from leaking between the inner surface of the intermediate plate and the outer surface of the inner plate facing the intermediate plate. The second oil reservoir labyrinth structure is for the second bushing shaft support in which the bushing projecting end portion partially projecting from the outer surface of the inner plate is recessed from the annular bulging portion and the inner surface of the intermediate plate is recessed. The seal ring is fitted over the outer peripheral surface of the annular bulging portion formed by surrounding and supporting the annular concave portion and bulging and formed on the opposing surface side between the intermediate plates, thereby solving the above-described problem. It has been solved.

The “offset state” in the oil-free multi-row chain of the present invention means that the first bushing shaft supporting annular recess, the second bushing shaft supporting annular recess, the annular bulging portion, and other plate portions Means a state of being shifted in the plate thickness direction and exhibiting a stepped shape.
In addition, 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 “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 at the outermost side in the chain width direction. Since the lubricating oil is enclosed 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.

That is, according to the oil-free multi-row chain of the present invention according to claim 1, the labyrinth structure for the first oil sump has the bush protruding end portion partially protruding from the outer surface of the inner plate and the inner surface of the outer plate recessed. The second labyrinth structure for oil sump partially protrudes from the outer surface of the inner plate, and is supported by the annular recess for supporting the first bushing shaft in an offset state bulged to the outer surface. The bushing protruding end is surrounded and supported by a second bushing shaft supporting annular recess formed by press-fitting a bearing cylindrical member across the pin hole so as to dent the inner surface of the intermediate plate. Therefore, the labyrinth structure for the first oil sump and the labyrinth structure for the second oil sump exhibit an oil sump function due to their complicatedly bent shapes, and are generated by the circular running during the chain running. Lubricating oil sealed between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin due to centrifugal force leaks to the outside between the outer plate and the inner plate and between the intermediate plate and the inner plate. In addition to suppressing this, external dust can be prevented from entering between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin from between the outer plate and the inner plate and between the intermediate plate and the inner plate.
And since the seal structure is constructed by press-fitting the bearing cylindrical member across the pin hole of the intermediate plate, the inner peripheral surface of the bush due to the centrifugal force generated by the circular travel during chain travel, etc. And the outer peripheral surface of the connecting pin can prevent the lubricating oil from leaking to the outside from between the adjacent intermediate plates, and external dust can be prevented from passing between the adjacent adjacent intermediate plates. And intrusion between the outer peripheral surface of the connecting pin can be suppressed.
In this way, it is possible to reduce wear damage on the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin and prevent chain wear elongation over a long period of time.
In addition, since the two intermediate plates integrated via the bearing cylindrical member are loosely fitted to the connecting pin, that is, so-called “clearance”, disassembly and assembling work such as chain cut-off can be easily achieved.

  In addition, since the first bushing shaft support annular recess is formed in an offset state in which the inner surface of the outer plate is recessed and bulged to the outer surface, the section modulus of the first bushing shaft support annular recess and the others Since the sectional modulus of the plate portion of the outer plate is approximately the same, it is possible to suppress a decrease in strength of the outer plate due to the formation of the first bushing shaft support annular recess, and when the outer plate is subjected to press punching, the outer plate The outer plate can be punched out and the first bushing shaft support annular recess can be formed at the same time simply by using a mold having a shape in which the inner surface is recessed and bulged to the outer surface. In addition to the punching process, it is not necessary to perform machining such as grinding or milling to form an annular recess for the first bushing shaft support on the outer plate, reducing the manufacturing burden of the chain. Since the annular recess for bushing shaft support is formed so that the inner side surface side of the intermediate plate is recessed by press-fitting the bearing cylindrical member over the pin hole, the annular recess for the second bushing shaft support is formed. Because normal flat intermediate plates can be used without applying offset processing to the intermediate plates themselves, for multi-row chains with normal horizontal pitches without causing changes in the thickness of the intermediate plates 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.

Further, between the outer plate and the inner plate, between the outer plate and the inner plate, and between the outer plate and the inner plate, without placing a seal member such as an O-ring in a pressed state. As a result, it is possible to suppress the external leakage of the lubricating oil and the intrusion of the external dust, so that a smooth chain bending motion can be realized during the chain operation and an increase in the number of chain parts can be avoided.
In addition, when a seal member such as an O-ring is disposed between the outer plate and the inner plate and between the intermediate plate and the inner plate to prevent external leakage of the lubricating oil, sliding contact wear of the seal member is prevented. In order to maintain the sealing performance of the lubricating oil, it is necessary to apply surface finishing to reduce the surface roughness on the inner surface of the outer plate, the inner surface of the intermediate plate, and the outer surface of the inner plate that are in contact with the seal member. However, in the oil-free multi-row chain of the present invention, it is not necessary to perform such surface finishing, and the manufacturing burden of the chain can be reduced.

  Next, according to the oil-free multi-row chain of the present invention according to claim 2, the labyrinth structure for the first oil sump has the bush protruding end portion partially protruding from the outer surface of the inner plate on the inner surface of the outer plate. The second labyrinth structure for oil sump is partially formed from the outer surface of the inner plate, while being surrounded and supported by an annular recess for supporting the first bushing shaft that is indented and bulged to the outer surface. Since the projecting bush projecting end portion is surrounded and supported by the annular bulging portion and the second bushing shaft supporting annular recess in which the inner surface of the intermediate plate is recessed in an offset state, the first oil sump is used. The labyrinth structure and the labyrinth structure for the second oil sump exhibit an oil sump function due to its complicatedly bent shape, and the bushing of the bush is caused by the centrifugal force generated by the circular travel during chain travel. Lubricating oil sealed between the peripheral surface and the outer peripheral surface of the connecting pin can be prevented from leaking to the outside between the outer plate and the inner plate and between the intermediate plate and the inner plate. Since it is possible to prevent external dust from entering between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin from between the plate and between the intermediate plate and the inner plate, the inner peripheral surface of the bush and the outer periphery of the connecting pin Surface wear damage can be reduced and chain wear elongation can be prevented over a long period of time.

  In addition, since the first bushing shaft support annular recess is formed in an offset state in which the inner surface of the outer plate is recessed and bulged to the outer surface, the section modulus of the first bushing shaft support annular recess and the others Since the sectional modulus of the plate portion of the outer plate is approximately the same, it is possible to suppress a decrease in strength of the outer plate due to the formation of the first bushing shaft support annular recess, and when the outer plate is subjected to press punching, the outer plate The outer plate can be punched out and the first bushing shaft support annular recess can be formed at the same time simply by using a mold having a shape in which the inner surface is recessed and bulged to the outer surface. In addition to the punching process, it is not necessary to perform machining such as grinding or milling to form an annular recess for the first bushing shaft support on the outer plate, reducing the manufacturing burden of the chain. Since the annular recess for supporting the bushing shaft is formed by recessing the inner surface of the intermediate plate in an offset state with respect to the annular bulging portion, the section modulus of the annular recessed portion for supporting the second bushing shaft and the annular bulging portion and Since the section modulus of the other plate portion is approximately the same, the reduction of the strength of the intermediate plate due to the formation of the second bushing shaft supporting annular recess and the annular bulging portion can be suppressed, and the stamping of the intermediate plate can be performed. When performing, the punching of the intermediate plate, the second bushing shaft support annular recess and the annular bulge are only required by using a die having a shape in which the inner surface of the intermediate plate is recessed and bulged to the opposite surface, that is, the outer surface. Since the forming process of the protruding portion can be performed at the same time, grinding and milling for forming the second bushing shaft supporting annular recess and the annular bulging portion separately from the punching process of the intermediate plate It is not necessary to perform the machining on the intermediate plate, such as a ring, it can be reduced manufacturing burden chain.

Further, between the outer plate and the inner plate, between the outer plate and the inner plate, and between the outer plate and the inner plate, without placing a seal member such as an O-ring in a pressed state. As a result, it is possible to suppress the external leakage of the lubricating oil and the intrusion of the external dust, so that a smooth chain bending motion can be realized during the chain operation and an increase in the number of chain parts can be avoided.
In addition, when a seal member such as an O-ring is disposed between the outer plate and the inner plate and between the intermediate plate and the inner plate to prevent external leakage of the lubricating oil, sliding contact wear of the seal member is prevented. In order to maintain the sealing performance of the lubricating oil, it is necessary to apply surface finishing to reduce the surface roughness on the inner surface of the outer plate, the inner surface of the intermediate plate, and the outer surface of the inner plate that are in contact with the seal member. However, in the oil-free multi-row chain of the present invention, it is not necessary to perform such surface finishing, and the manufacturing burden of the chain can be reduced.
Furthermore, since the seal structure is configured by fitting the seal ring across the outer peripheral surface of the annular bulging portion formed bulging on the opposing surface side between the intermediate plates, the opposing surface of such an intermediate plate In other words, the labyrinth structure for oil sump, in which the leakage path of the lubricating oil generated between the outer side surface, the outer peripheral surface of the annular bulge and the seal ring bends in a complex manner to provide an oil sump, It is possible to prevent the lubricating oil sealed between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin from leaking to the outside from between adjacent ones of the intermediate plates due to centrifugal force generated by the circular travel of the Further, external dust can be prevented from entering between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin from between adjacent ones of the intermediate plates.
In this way, 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.
In addition, since the intermediate plate is loosely fitted to the connecting pin, disassembly and assembly work such as chain cutting can be easily achieved.

  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 enclosed, the intermediate plate is loosely fitted to the connecting pin, and a seal structure that prevents leakage of the lubricating oil between the intermediate plates is configured between adjacent intermediate plates In addition to suppressing the external leakage of lubricating oil and the intrusion of external dust between adjacent intermediate plates, the chain can be easily assembled and disassembled. If the form of the specific implementation may any be any one.

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.

  Further, the specific shape of the intermediate plate incorporated in the oil-free multi-row chain of the present invention is only required to be formed with the same or smaller plate width dimension as the inner plate and the outer plate. If it is formed with a plate width dimension smaller than the plate, it can run stably because it is the height of the inner plate and outer plate only when it is run on a chain guide that is sandwiched from both sides, and the entire chain Contributes to weight reduction.

  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. The material is formed by compressing and forming a mixed metal powder containing iron, copper, nickel, chromium molybdenum steel, etc. and sintering at a sintering density of 6.0 g / cm3 to 7.0 g / cm3. If The bushing has a tough performance for receiving shearing force and impact force due to chain tension, and oil impregnation performance and sustained release for supplying lubricating oil between the connecting pin and bushing over a long period of time by impregnating with a lot of lubricating oil. Both performances are well balanced and can be fully demonstrated.

  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. .

  In addition, if an oil sump groove for supplying lubricating oil is engraved on the outer peripheral surface of the connecting pin between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin, enclose more lubricating oil. Since lubricating oil is continuously supplied between the connecting pin and the bush, sliding wear between the outer peripheral surface of the connecting pin and the inner peripheral surface of the bush can be reduced over a long period of time, and chain wear elongation can be further prevented. it can.

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.
And between the bush 130 and the connecting pin 170, lubricating oil is enclosed.

Therefore, specific forms of the bush 130, the outer plate 160, and the intermediate plate 150, 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, as shown in FIG. 2 and FIG. 3, the outer plate 160 has an inner side surface recessed, that is, an offset ring for supporting the first bushing shaft inflated to the outer side surface recessed. A recess 161 is formed.
Then, the bushing protruding end portion 131 partially protruding from the outer surface of the inner plate 110 is surrounded and supported by the first bushing shaft supporting annular recess 161 so as to face the inner surface of the outer plate 160 and the outer plate 160. A labyrinth structure L1 for first oil sump that prevents leakage of lubricating oil is formed between the inner plate 110 and the outer surface.

Further, as shown in FIGS. 2 and 3, a cylindrical bearing member 180 is press-fitted into the pin holes of the two intermediate plates 150 arranged in parallel in the chain width direction so as to straddle the two pin holes. Thus, a seal structure S that prevents external leakage of the lubricating oil between adjacent ones of the intermediate plates 150 is formed.
Also, the bearing cylindrical member 180 is press-fitted into the pin hole so that the inner surfaces of the two intermediate plates 150 are recessed, whereby the second bushing shaft is fitted on the inner surface of the intermediate plate 150. An annular support recess 151 is formed.
The bushing protruding end portion 131 partially protruding from the outer surface of the inner plate 110 is surrounded and supported by the second bushing shaft supporting annular recess 151 so as to face the inner surface of the intermediate plate 150 and the intermediate plate 150. A second oil sump labyrinth structure L2 that prevents leakage of the lubricating oil is formed between the inner plate 110 and the outer surface.
Further, the bearing cylindrical member 180 described above is loosely fitted to the connecting pin 170.

The “offset state” as used in the oil-free multi-row chain 100 of the present invention means a state in which the first bushing shaft supporting annular recess 161 and the other plate portion are shifted to form a stepped shape. is doing.
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 built-in 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.

In the non-lubricated multi-row chain 100 of this embodiment obtained in this way, the seal structure S that prevents the lubricating oil from leaking between the intermediate plates 150 extends over the pin holes of the intermediate plate 150 and the bearing cylindrical member 180. It is configured by press-fitting.
Therefore, the lubricating oil sealed between the inner peripheral surface of the bush 130 and the outer peripheral surface of the connecting pin 170 due to centrifugal force generated by the circular traveling during the chain traveling is externally applied from between the adjacent ones of the intermediate plate 150. Leaking to the outer peripheral surface of the bushing 130 and the outer peripheral surface of the connecting pin 170 between the adjacent adjacent plates of the intermediate plate 150 can be suppressed. The wear damage of the peripheral surface and the outer peripheral surface of the connecting pin 170 can be reduced to prevent chain wear elongation over a long period of time, and the two intermediate plates 150 integrated via the bearing cylindrical member 180 can be connected to the connecting pin 170. Because of the loose fit, so-called clearance fit, disassembly and assembling work such as chain cutting can be easily achieved.

Further, the first oil sump labyrinth structure L1 has an offset state in which the bushing protruding end portion 131 that partially protrudes from the outer surface of the inner plate 110 is bulged to the outer surface by recessing the inner surface of the outer plate 160. The second oil sump labyrinth structure L2 is formed by surrounding and supporting the bushing projecting end portion 131 protruding partially from the outer surface of the inner plate 110 with the intermediate plate 150. The bearing cylindrical member 180 is surrounded and supported by a second bushing shaft supporting annular recess 151 formed by press-fitting over the pin hole so that the inner surface of the bearing is recessed.
Therefore, the labyrinth structure L1 for the first oil sump and the labyrinth structure L2 for the second oil sump exhibit an oil sump function due to their complicatedly bent shapes, and are caused by centrifugal force generated by the circular travel during the chain travel. The lubricating oil sealed between the inner peripheral surface of the bush 130 and the outer peripheral surface of the connecting pin 170 leaks to the outside from between the outer plate 160 and the inner plate 110 and between the intermediate plate 150 and the inner plate 110. In addition to being able to suppress this, external dust enters between the inner peripheral surface of the bush 130 and the outer peripheral surface of the connecting pin 170 from between the outer plate 160 and the inner plate 110 and between the intermediate plate 150 and the inner plate 110. Therefore, the wear damage on the inner peripheral surface of the bush 130 and the outer peripheral surface of the connecting pin 170 is reduced, and the chain wear elongation is increased. It is possible to prevent over.

Further, the first bushing shaft supporting annular recess 161 is formed in an offset state in which the inner surface of the outer plate 160 is recessed and bulged to the outer surface.
Accordingly, the section modulus of the first bushing shaft supporting annular recess 161 and the section modulus of the other plate portions are approximately the same, and therefore the strength of the outer plate 160 due to the formation of the first bushing shaft supporting annular recess 161. When the outer plate 160 is subjected to press punching, the outer plate 160 can be punched only by using a mold having a shape in which the inner surface of the outer plate 160 is recessed and bulged to the outer surface. Since the formation of the first bushing shaft supporting annular recess 161 can be performed at the same time, machining such as grinding and milling for forming the first bushing shaft supporting annular recess 161 separately from the punching of the outer plate 160. Is not required to be applied to the outer plate 160, and the manufacturing burden of the chain can be reduced.
The second bushing shaft support annular recess 151 is formed so as to recess the inner side surface of the intermediate plate 150 by press-fitting the bearing cylindrical member 180 over the pin hole.
Therefore, the normal flat intermediate plate 150 can be used without applying the offset processing for forming the second bushing shaft supporting annular recess 151 to the intermediate plate 150 itself, so that the thickness of the intermediate plate 150 is changed. It is possible to adapt a sprocket for a multi-row chain (not shown) having a horizontal pitch according to a normal standard, that is, a sprocket for a multi-row chain in which each sprocket tooth is arranged in parallel in the sprocket thickness direction at a normal standard interval. .

Further, between the outer plate 160 and the inner plate 110 and between the intermediate plate 150 and the inner plate 110, a seal member such as an O-ring is not disposed in a pressed state. Since the external leakage of the lubricating oil and the entry of the external dust between the intermediate plate 150 and the inner plate 110 can be suppressed, a smooth chain bending motion can be realized during the chain operation, and an increase in the number of chain parts can be avoided.
When a sealing member such as an O-ring is disposed between the outer plate 160 and the inner plate 110 and between the intermediate plate 150 and the inner plate 110 in order to prevent external leakage of the lubricating oil, the sliding contact of the sealing member is performed. In order to prevent wear and maintain the sealing performance of the lubricating oil, the surface roughness is reduced on the inner surface of the outer plate 160 that contacts the seal member, the inner surface of the intermediate plate 150, and the outer surface of the inner plate 110. Although it is necessary to perform surface finishing, the oil-free multi-row chain 100 of the present invention does not need to be subjected to such surface finishing and can greatly reduce the manufacturing burden of the chain.

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 FIGS. 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 bush 230 and the connecting pin 270, lubricating oil is enclosed.
Furthermore, the intermediate plate 250 is loosely fitted to the connecting pin 270.

Therefore, specific forms of the bush 230, the outer plate 260, and the intermediate plate 250, 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, as shown in FIG. 4 and FIG. 5, the outer plate 260 has an inner side surface recessed, that is, an offset annular ring for supporting the first bushing shaft bulged to the recessed outer surface. A recess 261 is formed.
Then, 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 bushing shaft support annular recess 261 so as to face the inner surface of the outer plate 260 and the outer plate 260. A first oil sump labyrinth structure L1 that prevents leakage of the lubricating oil is formed between the inner plate 210 and the outer surface.

As shown in FIGS. 4 and 5, the intermediate plate 250 includes an annular bulging portion 252 that is concentric with the pin hole and bulges on the opposing surface side, that is, on the outer surface side, and the annular bulging portion. 252 and an annular recess 251 for supporting the second bushing shaft formed by recessing the inner surface in an offset state.
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 bushing shaft supporting annular recess 251 so as to face the inner surface of the intermediate plate 250 and the intermediate plate 250. A second oil sump labyrinth structure L <b> 2 that prevents leakage of the lubricating oil is formed between the inner plate 210 and the outer surface.
Further, the two annular bulging portions 252 are formed on the outer peripheral surface of the annular bulging portion 252 formed on the opposite surface side of the two intermediate plates 250 arranged in parallel in the chain width direction, that is, on the outer surface side. The seal ring 280 is loosely fitted so as to straddle the outer periphery of the intermediate plate 250, thereby preventing the lubricating oil from leaking between the outer surface of the intermediate plate 250, the outer peripheral surface of the annular bulging portion 252, and the seal ring 280. A labyrinth structure L3 for three oil reservoirs is formed as a seal structure S.

The “offset state” in the oil-free multi-row chain 200 of the present invention refers to the first bushing shaft supporting annular recess 261, the second bushing shaft supporting annular recess 251 and the annular bulging portion 252, and the others. This means that the plate portion is displaced and exhibits a stepped shape.
In addition, 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 non-lubricated multi-row chain 200 of the present embodiment thus obtained has an annular bulge in which a seal structure S that prevents leakage of lubricating oil between the intermediate plates 250 is formed to bulge on the opposite surface side of the intermediate plate 250. The seal ring 280 is fitted over the outer peripheral surface of the protruding portion 252.
Accordingly, the leakage path of the lubricating oil generated between the facing surface of the intermediate plate 250, that is, the outer surface, the outer peripheral surface of the annular bulging portion 252 and the seal ring 280 is bent in a complicated manner to exhibit an oil reservoir. The lubricating oil sealed between the inner peripheral surface of the bushing 230 and the outer peripheral surface of the connecting pin 270 due to the centrifugal force generated by the circular traveling during the chain traveling is the third oil reservoir labyrinth structure L3. Can be prevented from leaking to the outside from between adjacent ones of the intermediate plates 250, and external dust can enter between the adjacent inner surfaces of the intermediate plates 250 between the inner peripheral surface of the bushing 230 and the outer peripheral surface of the connecting pin 270. Therefore, the wear damage on the inner peripheral surface of the bushing 230 and the outer peripheral surface of the connecting pin 270 can be reduced to prevent chain wear elongation for a long period of time. Since over bets 250 is loosely fitted in the connecting pin 270, the degradation assembling work such as the chain cutting splicing it can be easily achieved.

Further, the first oil sump labyrinth structure L1 has an offset state in which the bushing protruding end portion 231 that partially protrudes from the outer surface of the inner plate 210 is bulged to the outer surface by recessing the inner surface of the outer plate 260. The second oil sump labyrinth structure L2 is formed by encircling the bushing projecting end portion 231 partially projecting from the outer surface of the inner plate 210. It is constituted by surrounding and supporting by a second bushing shaft supporting annular recess 251 in which the inner surface of the intermediate plate 250 is recessed in an offset state with the portion 252.
Therefore, the labyrinth structure L1 for the first oil sump and the labyrinth structure L2 for the second oil sump exhibit an oil sump function due to their complicatedly bent shapes, and are caused by centrifugal force generated by the circular travel during the chain travel. The lubricating oil sealed between the inner peripheral surface of the bushing 230 and the outer peripheral surface of the connecting pin 270 leaks to the outside from between the outer plate 260 and the inner plate 210 and between the intermediate plate 250 and the inner plate 210. In addition to being able to suppress this, external dust enters between the inner peripheral surface of the bush 230 and the outer peripheral surface of the connecting pin 270 from between the outer plate 260 and the inner plate 210 and between the intermediate plate 250 and the inner plate 210. Therefore, the wear damage on the inner peripheral surface of the bushing 230 and the outer peripheral surface of the connecting pin 270 is reduced to increase the chain wear elongation. It is possible to prevent over.

Also, the first bushing shaft support annular recess 261 is formed in an offset state in which the inner surface of the outer plate 260 is recessed and bulged to the outer surface.
Since the section modulus of the first bushing shaft support annular recess 261 and the section modulus of the other plate portions are approximately the same, the strength reduction of the outer plate 260 due to the formation of the first bushing shaft support annular recess 261 is reduced. In addition, when the outer plate 260 is subjected to press punching, the outer plate 260 can be punched into the first shape only by using a die having a shape in which the inner surface of the outer plate 260 is recessed and bulged to the outer surface. Since the forming process of the annular recess 261 for the bushing shaft support can be performed at the same time, machining such as grinding or milling for forming the first recessed ring recess 261 for the bushing shaft is performed separately from the punching process of the outer plate 260. There is no need to apply to the plate 260, and the manufacturing burden of the chain can be reduced.

Further, the second bushing shaft supporting annular recess 251 is formed by recessing the inner surface of the intermediate plate 250 in an offset state with the annular bulging portion 252 bulging and formed on the opposite surface side of the intermediate plate 250. .
Accordingly, since the section modulus of the second bushing shaft supporting annular recess 251 and the annular bulging portion 252 and the section modulus of the other plate portion are approximately the same, the second bushing supporting annular recess 251 and the annular bulging The reduction in strength of the intermediate plate 250 due to the formation of the portion 252 can be suppressed, and when the intermediate plate 250 is subjected to press punching, the inner surface of the intermediate plate 250 is recessed to bulge to the opposite surface, that is, the outer surface. Since the punching process of the intermediate plate 250 and the forming process of the second bushing shaft supporting annular recess 251 and the annular bulging part 252 can be performed at the same time only by using the mold having the shape to be formed, the punching process of the intermediate plate 250 is performed. Separately, machining such as grinding or milling to form the second bushing shaft supporting annular recess 251 and the annular bulging portion 252 is performed. It is not necessary to apply between the plate 250, can reduce the production burden of the chain.

Further, between the outer plate 260 and the inner plate 210, and between the intermediate plate 250 and the inner plate 210, a seal member such as an O-ring is not disposed in a pressed state. Since external leakage of lubricating oil and intrusion of external dust between the intermediate plate 250 and the inner plate 210 can be suppressed, a smooth chain bending motion can be realized during chain operation, and an increase in the number of chain parts can be avoided.
When a sealing member such as an O-ring is disposed between the outer plate 260 and the inner plate 210 and between the intermediate plate 250 and the inner plate 210 in order to prevent external leakage of the lubricating oil, the sliding contact of the sealing member is performed. In order to prevent wear and maintain the sealing performance of the lubricating oil, the surface roughness is reduced on the inner surface of the outer plate 260 in contact with the sealing member, the inner surface of the intermediate plate 250, and the outer surface of the inner plate 210. Although it is necessary to perform surface finishing, the oil-free multi-row chain 200 of the present invention does not need to be subjected to such surface finishing and can greatly reduce the manufacturing burden of the chain.

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 perspective view which shows the connection state of the oil-free multi-row chain which is 2nd Example of this invention. FIG. 5 is a partial cross-sectional view of the oil-free multi-row chain shown in FIG. 4.

Explanation of symbols

100, 200 ... Oil-free multi-row chain 110, 210 ... Inner plate 120, 220 ... Roller 130, 230 ... Bush 131, 231 ... Bush protruding end 140, 240 ... Inside Link unit 150, 250 ... Intermediate plate 151, 251 ... Second recess for supporting bushing shaft 160, 260 ... Outer plate 161, 261 ... First recess for supporting bushing 170, 270 ··· Connection pin 180 ··· bearing cylindrical member 252 ··· annular bulge portion 280 ··· seal ring S ··· seal structure L1 · · · labyrinth structure for first oil sump L2 · · · second oil sump Labyrinth structure for L3 ... 3rd oil labyrinth structure

Claims (2)

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. A large number of connecting pins, which are press-fitted into a pair of front and rear pin holes of the outer plate arranged on the outside and loosely fitted with an intermediate plate, are connected in the longitudinal direction of the chain, and the inner peripheral surface of the bush and the outer periphery of the connecting pin An oil-free multi-row chain in which lubricating oil is sealed between
A bushing protrusion in which a first oil sump labyrinth structure for preventing leakage of the lubricating oil between the inner surface of the outer plate and the outer surface of the inner plate facing the outer plate partially protrudes from the outer surface of the inner plate. The end portion is configured to be surrounded and supported by an annular recess for supporting the first bushing shaft in an offset state in which the inner side surface of the outer plate is recessed and bulged to the outer side surface,
A bushing protrusion in which a second oil sump labyrinth structure for preventing leakage of the lubricating oil between the inner surface of the intermediate plate and the outer surface of the inner plate facing the intermediate plate partially protrudes from the outer surface of the inner plate The end portion is configured to be surrounded and supported by a second bushing shaft support annular recess formed by press-fitting a bearing cylindrical member across the pin hole so as to dent the inner surface of the intermediate plate. Oil-free multi-row chain characterized by 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. A large number of connecting pins, which are press-fitted into a pair of front and rear pin holes of the outer plate arranged on the outside and loosely fitted with an intermediate plate, are connected in the longitudinal direction of the chain, and the inner peripheral surface of the bush and the outer periphery of the connecting pin An oil-free multi-row chain in which lubricating oil is sealed between
A bushing protrusion in which a first oil sump labyrinth structure for preventing leakage of the lubricating oil between the inner surface of the outer plate and the outer surface of the inner plate facing the outer plate partially protrudes from the outer surface of the inner plate. The end portion is configured to be surrounded and supported by an annular recess for supporting the first bushing shaft in an offset state in which the inner side surface of the outer plate is recessed and bulged to the outer side surface,
A bushing protrusion in which a second oil sump labyrinth structure for preventing leakage of the lubricating oil between the inner surface of the intermediate plate and the outer surface of the inner plate facing the intermediate plate partially protrudes from the outer surface of the inner plate The end portion is configured to be surrounded and supported by a second bushing shaft supporting annular recess in which the inner surface of the intermediate plate is recessed in an offset state with the annular bulging portion,
A non-lubricated multi-row chain, wherein a seal ring is fitted over the outer peripheral surface of an annular bulge portion that is bulged and formed on the opposing surface side between the intermediate plates.

Images