JP2009250329A - Oil-free chain with joint link unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil-free chain with a joint link unit which can avoid degradation in plate strength and reduce the load of manufacturing a chain, which can prevent a lubricating oil from leaking from the space between an idle-fitting plate and a joint pin, which can securely position the idle-fitting plate in the chain width direction, and which can prevent the lubricating oil from leaking to the outside and outside dust from entering. <P>SOLUTION: The oil-free chain 100 with the joint link unit consists of a chain body 110 and the joint link unit 120. A bush-projection 112a projected from an inner plate 113 is surrounded and supported by annular recesses 122a, 123a for pivoting a bush of a press-fitting plate 122 and the idle-fitting plate 123. Then an elastic seal member 130 is tightly engaged with the outer peripheral surface of the joint pin 121 in a state where it is placed between the idle-fitting plate 123 and a fastening means 124 for a joint. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an oil-free chain with a joint link unit in which a chain main body used for a transmission roller chain, a conveyor chain for conveyance, and the like is connected endlessly by a joint link unit.

  Conventionally, an inner link formed by press-fitting and fitting both ends of a pair of front and rear bushes to an inner plate, and an outer link formed by press-fitting and fitting both ends of a pair of front and rear pins penetrating into the bush to the outer plate, respectively. Chain bodies alternately connected in the longitudinal direction of the chain, a pair of front and rear joint pins that pass through the bushes located at both ends of the chain body, an outer plate that press-fits the base end portion of the joint pins, and the joint pins A seal chain comprising a joint plate that loosely fits the tip of the joint plate and a clip that fastens the pin protruding from the outer surface of the joint plate to the joint plate, and a joint link that interconnects both ends of the chain body. Are known.

In the conventional seal chain, the seal ring is provided on the outside of the joint link as a sealing means for preventing external leakage of the lubricating oil injected between the bushes located at both ends of the chain body and the joint pins penetrating into the bush. It is arrange | positioned between the plate and joint plate, and the inner plate of the chain main body which opposes this outer plate and joint plate (for example, refer patent document 1).
JP 2007-205545 A (Claims, FIG. 3)

  However, in the conventional seal chain as described above, the outer plate of the joint link and the joint plate and the inner plate of the chain body facing the outer plate and the joint plate are sealed and injected between the joint pin and the bush. In order to maintain the sealing effect of the lubricated oil, the seal ring is disposed in a pressed state, and the relative bending between the outer plate and the joint plate and the inner plate is caused by the pressing force of the pressed state. There is a problem that resistance, that is, bending resistance of the chain itself increases.

  Also, in order to prevent the sealing effect from deteriorating due to sliding contact with the outer plate, joint plate, inner plate, etc., the inner ring of the outer plate and joint plate in contact with the seal ring is prevented. There is a problem that it is necessary to perform a surface finishing process to reduce the surface roughness of the side surface and the outer surface of the inner plate, and the processing burden of the surface finishing process increases.

  Therefore, the present invention solves the conventional problem, that is, the object of the present invention is to significantly reduce the burden of chain manufacturing while avoiding a decrease in plate strength, and at the same time a joint link unit at the time of chain operation The outer sealing surface of the joint pin hole and the outer surface of the joint pin are reliably prevented from leaking out of the lubricating oil sealed between the joint pin of the chain and the bushing of the chain body and the entry of external dust. In addition to preventing leakage of lubricating oil from the gap, the loose-fitting plate is securely positioned in the width direction of the chain, and further, external leakage of lubricating oil and external dust enclosed between the connecting pin of the chain body and the bush It is an object to provide an oil-free chain with a joint link unit that prevents intrusion.

  The present invention according to claim 1 is characterized in that both ends of a pair of front and rear bushings are inserted into the bush press-fit holes of the pair of left and right inner plates and both ends of the pair of front and rear connection pins penetrating into the bushes. Chain body with outer links that are press-fitted into the pin press-fitting holes of a pair of left and right outer plates, and the front and rear that penetrate through the bushes located at both ends of the chain body. A pair of joint pins, a press-fit plate that press-fits the base end portion of the joint pin into a pair of front and rear joint pin press-fit holes, a loose-fit plate that loosely fits the distal end portion of the joint pin into the pair of front and rear joint pin holes, and the play A joint link which is composed of a joint fastening means for positioning and fastening the tip of a joint pin protruding from the outer surface of the fitting plate to the outer surface of the loose fitting plate and connecting both ends of the chain body to each other In an oil-free chain with a joint link unit, wherein the inner plate is located at both ends of the chain body, and is formed of a knit and has a lubricating oil sealed between the inner peripheral surface of the bush and the outer peripheral surface of the joint pin and the connecting pin. Bush projecting end portions partially projecting from the outer surface of the bushing are respectively recessed by bushing shaft support annular recesses that are recessed from the inner surface of the press-fitting plate and loose fitting plate of the joint link unit and bulged to the outer surface in an offset state. An elastic seal member that is supported by the surroundings and that prevents external leakage of lubricating oil from between the inner peripheral surface of the joint pin hole of the loosely fitting plate and the outer peripheral surface of the joint pin is provided for the loosely fitting plate and the joint. The above-mentioned problem is solved by being closely fitted to the outer peripheral surface of the joint pin while being interposed between the fastening means.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, the elastic sealing member is fixed to the outermost surface of the loosely fitting plate, thereby solving the above-described problem.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, a pin hole inner peripheral edge portion of the elastic seal member is formed in a seal member fitting groove portion formed on an outer peripheral surface of the joint pin. The above-mentioned problem is solved by being fitted in.

  According to a fourth aspect of the present invention, in addition to the structure according to any one of the first to third aspects, the joint fastening means is fitted into a clip fitting groove formed at the tip of the joint pin. The above-described problems are solved by having a clip main body portion and a lip portion standing from the clip main body portion toward the outer surface of the loosely fitting plate.

  According to a fifth aspect of the present invention, in addition to the configuration according to any one of the first to fourth aspects, the loosely fitting plate has a small diameter portion for loosely fitting, wherein the loosely fitting plate has a reduced diameter on the distal end side of the joint pin. The above-described problems are solved by being loosely fitted in the housing.

  According to a sixth aspect of the present invention, in addition to the structure according to any one of the first to fifth aspects, the loose fitting plate has an annular coining portion formed by coining around the joint pin hole. By doing so, the above-described problems are further solved.

  According to a seventh aspect of the present invention, in addition to the structure according to any one of the first to sixth aspects, the bushing protruding end portion that partially protrudes from the outer surface of the inner plate of the chain main body has the chain main body. The above-described problems are further solved by being surrounded and supported by the annular recesses for supporting the bushing shaft that are recessed on the inner side surface of the outer plate and bulge to the outer side surface in an offset state.

The “offset state” in the oil-free chain with a joint link unit of the present invention is a state in which the annular recess for supporting the bushing shaft and the other plate portion are shifted in the plate thickness direction to form a stepped shape. Means.
In addition, the “coining process” in the oil-free chain with a joint link unit of the present invention means a process of improving the strength of the compressed part by partially compressing the material.

  Therefore, the present invention provides a pair of left and right ends of a pair of front and rear connecting pins penetrating into the bushing and the inner link formed by press-fitting both ends of the pair of front and rear bushes into the bush press-fitting holes of the pair of left and right inner plates. A chain body in which outer links formed by press-fitting and fitting into pin press-fitting holes of the outer plate of the outer plate are alternately connected in the longitudinal direction of the chain, and a pair of front and rear joint pins and joints penetrating through the bushes positioned at both ends of the chain body. A press-fit plate that press-fits the base end portion of the pin into a pair of front and rear joint pin press-fit holes, a loose-fit plate that loosely fits the front-end portion of the joint pin into the pair of front and rear joint pin holes, and projects from the outer surface of the free-fit plate And a joint link unit that connects the ends of the chain body to each other. By sealing the lubricating oil between the inner peripheral surface of the nut and the outer peripheral surface of the coupling pin and the connecting pin, not only can the chain be driven for a long time without external lubrication, but the following A specific effect can be produced.

  That is, according to the oil-free chain with a joint link unit of the present invention according to claim 1, the bush protruding end portions that partially protrude from the outer surfaces of the inner plates located at both ends of the chain body are the press-fitting plates of the joint link unit. Further, the bushing projecting end portion and the bushing shaft supporting ring are supported by being surrounded and supported by the bushing shaft supporting ring-shaped recesses in which the inner surface of the loose-fitting plate is recessed and bulged to the outer surface in the offset state. The oil leakage labyrinth structure that exhibits the oil sump function by complicatedly bending the leakage path of the lubricating oil generated between the recess and the recess, and the bushing caused by the centrifugal force generated by the circular running during chain operation, etc. If the lubricating oil sealed between the joint pins is prevented from leaking out from between the outer surface of the inner plate and the inner surface of the press-fitting plate and the loose-fitting plate, In addition, since the entry of external dust is suppressed, the wear damage that tends to occur between the inner peripheral surface of the bushing of the chain body and the outer peripheral surface of the joint pin of the joint link unit is reduced, and the chain wear elongation is prolonged. Can be prevented.

  Further, since the annular recess for bushing shaft support is formed in an offset state in which the inner surface of the press-fitting plate and the loose fitting plate is recessed and bulged to the outer surface, the section coefficient of the annular recess for bushing shaft support and Since the section modulus of the plate portion other than the same is approximately the same, it is possible to suppress a decrease in strength of the press-fitting plate and the loose-fitting plate due to the formation of the annular recess for the bushing shaft support. When processing, simply use a die that has a shape that allows the inner surface of the press-fitting plate and loose-fitting plate to be recessed and bulge to the outer surface. Can be performed at the same time, so an annular recess for bushing shaft support is formed separately from punching of the press-fit plate and loose-fitting plate That grinding and there is no need to perform machining such as press-fitting plate and loosely plate milling, can reduce the production burden of the chain.

  Further, since the elastic seal member is closely fitted to the outer peripheral surface of the joint pin, the lubricating oil injected between the bushing and the joint pin is moved toward the joint pin distal end side along the joint pin outer peripheral surface. It prevents leakage and prevents external dust from entering between the bush and the joint pin along the outer periphery of the joint pin, so that the inner peripheral surface of the bush of the chain body and the outer peripheral surface of the joint pin of the joint link unit It is possible to reduce wear damage that tends to occur between the chain and the chain to prevent wear elongation of the chain over a long period of time.

  Further, as described above, the elastic seal member is disposed between the loose fitting plate and the coupling fastening means, that is, on the outer surface side of the loose fitting plate, so that the relative link between the inner link of the chain body and the joint link unit is increased. Unlike the case where an elastic seal member is arranged on the inner side of the loose-fitting plate, which is likely to be affected by various bending movements, excessive sliding contact between the other chain member and the elastic seal member during chain operation can be avoided. In addition, it is possible to prevent wear damage of the elastic seal member and avoid deterioration of the sealing effect due to wear damage of the elastic seal member.

  In addition, the elastic seal member tightly fitted to the joint pin on the outer surface side of the loosely fitting plate regulates the swinging or shifting of the loosely fitting plate to the outside in the chain width direction. The relative positional relationship between the bushing shaft supporting annular recess and the bushing projecting end supported by the bushing shaft supporting annular recess is suppressed within a predetermined range, and the bush projecting end and bushing The oil sump function can be reliably exhibited by the labyrinth structure for oil sump constituted by the annular recess for shaft support.

  In addition, since the elastic seal member is made of an elastic body, the elastic seal member is elastically deformed flexibly with respect to the joint pin when the chain is assembled. Therefore, the assembly work on the joint pin can be easily achieved without requiring an excessive work load. .

  Further, in the conventional seal chain, the surface roughness is reduced on the inner surface of the outer plate and the joint plate and the outer surface of the inner plate in order to prevent sliding contact wear of the seal ring and maintain the sealing performance of the lubricating oil. Although it is necessary to perform surface finishing, in the oil-free chain with a joint link unit of the present invention, it is not necessary to perform surface finishing as in the conventional case, and the manufacturing burden of the chain can be reduced.

  Furthermore, since the seal ring is not pressed between the outer surface of the inner plate and the inner surface of the press-fitting plate and the loose-fitting plate, unlike the conventional seal chain, it bends smoothly during chain operation. Can run around.

  According to the oilless chain with a joint link unit of the present invention according to claim 2, in addition to the effect exhibited by the oilless chain with a joint link unit according to claim 1, the elastic seal member is provided on the outermost surface of the loosely fitting plate. By being fixed, the inner peripheral edge of the pin hole of the elastic seal member closely fitted to the outer peripheral surface of the joint pin seals between the inner peripheral surface of the joint pin hole of the loose-fitting plate and the outer peripheral surface of the joint pin. As a result, external leakage of the lubricating oil is prevented and intrusion of external dust is prevented, so that chain wear elongation can be prevented over a long period of time.

  Further, since the elastic seal member is fixed to the loose fitting plate, the elastic seal member and the loose fitting plate can be handled integrally, so that disassembly and assembling work such as chain cut-off can be easily achieved.

  In addition, as described above, the elastic seal member integrated with the loose fitting plate is closely fitted to the joint pin, so that the loose fitting plate is positioned in the chain width direction so that the loose fitting plate is in the chain width direction. In order to prevent swinging or shifting, the relative positional relationship between the bushing shaft supporting annular recess formed in the loose fitting plate and the bushing projecting end supported by the bushing shaft supporting annular recess is predetermined. The oil sump function by the oil sump labyrinth structure constituted by these bushing projecting end portions and bushing shaft supporting annular recesses can be reliably exhibited while being held within the range.

  According to the oilless chain with a joint link unit of the present invention according to claim 3, in addition to the effect produced by the oilless chain with a joint link unit according to claim 1 or 2, the inner peripheral edge of the pin hole of the elastic seal member The contact area between the seal member fitting groove and the inner peripheral edge of the pin hole of the elastic seal member is increased because the portion is fitted in the seal member fitting groove formed on the outer peripheral surface of the joint pin. Since the sealing effect by the elastic seal member is improved, external leakage of the lubricating oil and intrusion of external dust can be more reliably prevented.

  Further, even when a gap is generated between the seal member fitting groove and the pin hole inner peripheral edge of the elastic seal member due to wear of the elastic seal member or the like, such a seal member fitting groove and the elastic seal are also formed. Since the labyrinth structure for oil reservoir in which the gap generated between the inner peripheral edge of the pin hole of the member is bent in a complicated manner is exhibited, such a labyrinth structure for oil reservoir exhibits an oil reservoir function, and external leakage of lubricating oil and Intrusion of external dust can be prevented.

  Further, since the fitting force of the elastic seal member to the joint pin is increased by fitting the elastic seal member into the seal member fitting groove, the loose fitting plate as described above is swung in the chain width direction. The regulatory effect can be further improved.

  According to the oilless chain with a joint link unit of the present invention according to claim 4, in addition to the effect produced by the oilless chain with a joint link unit according to any one of claims 1 to 3, a fastening means for joints Has a clip body portion that is fitted into a clip fitting groove formed at the tip portion of the joint pin, so that the tip portion of the joint pin that protrudes from the outer surface of the loose-fit plate is connected to the outer surface of the loose-fit plate. Since the joint fastening means has a lip portion standing from the clip main body portion toward the outer surface of the loose-fitting plate, the lip portion can be easily and reliably positioned in the form of a clip. The bushing shaft support annular recess formed in the loose fitting plate and the bushing shaft. For oil sump comprised of these bushing projecting end portions and bushing shaft supporting annular recesses, with the relative positional relationship between the bushing projecting end portions surrounded and supported by the annular recessing portion within a predetermined range. The oil sump function by the labyrinth structure can be surely exhibited.

  According to the oil-free chain with a joint link unit of the present invention according to claim 5, in addition to the effect produced by the oil-free chain with a joint link unit according to any one of claims 1 to 4, The loose passage of the lubricating oil generated between the joint pin and the loose-fitting plate is bent flexibly by loosely fitting the small-diameter portion for loose fitting of the plate, which is formed by reducing the tip end side of the joint pin. Since the oil pool labyrinth structure is exhibited, it is possible to more reliably prevent the external leakage of the lubricating oil and the entry of external dust from between the inner peripheral surface of the joint pin hole of the loose fitting plate and the outer peripheral surface of the joint pin.

  In addition, the plate loose fitting small diameter portion is formed by reducing the diameter of the distal end portion side of the joint pin, so that the loose fitting plate is formed on the step portion formed between the base end portion of the joint pin and the plate loose fitting small diameter portion. Since the inner peripheral edge of the joint pin hole can be brought into contact with the inner surface of the loose fitting plate so as to be able to regulate the swinging or shifting of the loose fitting plate toward the inner side in the chain width direction, the annular concave portion for the bushing shaft support formed on the loose fitting plate and the bushing shaft support For oil sump comprised of these bushing projecting end portions and bushing shaft supporting annular recesses, with the relative positional relationship between the bushing projecting end portions surrounded and supported by the annular recessing portion within a predetermined range. The oil sump function by the labyrinth structure can be exhibited reliably, and the swinging or shifting of the loose fitting plate to the outside in the chain width direction is regulated by using the lip portion of the elastic sealing member and the coupling fastening means described above. , Chain width direction outside In addition, the swinging or shifting of the loose-fitting plate to the inner side of the chain width direction, that is, both sides of the chain width direction can be reliably controlled, and further, it is formed between the base end portion of the joint pin and the small diameter portion for loosely fitting the plate. By restricting the swing of the loose fitting plate to both sides in the chain width direction with the stepped portion in contact with the inner peripheral edge of the joint fitting hole of the loose fitting plate, The space between the joint pin and the outer peripheral surface can be completely sealed.

  According to the oilless chain with a joint link unit of the present invention according to claim 6, in addition to the effect produced by the oilless chain with a joint link unit according to any one of claims 1 to 5, By having an annular coining part formed by coining around the joint pin hole, the joint pin hole is prone to fatigue failure when chain tension acts on the loose-fitting plate via the joint pin. Since the surrounding fatigue strength can be improved, the chain life can be maintained over a long period of time.

  According to the oil-free chain with a joint link unit of the present invention according to claim 7, in addition to the effect produced by the oil-free chain with a joint link unit according to any one of claims 1 to 6, Bush projecting ends that partially project from the outer surface of the plate are surrounded and supported by an annular recess for supporting the bushing shaft that is recessed from the inner surface of the outer plate of the chain body and bulges to the outer surface in an offset state. As a result, the oil leakage labyrinth structure in which the leakage path of the lubricating oil generated between the bushing projecting end portion and the bushing shaft supporting annular recess is bent in a complex manner to exhibit an oil retaining function is formed. Lubricating oil sealed between the bushing and the connecting pin due to centrifugal force generated by circular running during operation is removed from between the outer surface of the inner plate and the inner surface of the outer plate. Suppresses leakage and prevents intrusion of external dust, reducing wear damage that tends to occur between the inner peripheral surface of the bushing of the chain body and the outer peripheral surface of the connecting pin of the chain body, and reducing chain wear elongation Can be prevented over a long period of time.

  Further, the annular recess for bushing shaft support is formed in an offset state in which the inner surface of the outer plate of the chain body is recessed and bulged to the outer surface, so that the section modulus of the annular recess for bushing shaft support and the others Since the section modulus of the plate portion of the outer plate is approximately the same, it is possible to suppress a decrease in the strength of the outer plate due to the formation of the annular recess for the bushing shaft support, and when the outer plate is subjected to press punching, The punching of the outer plate can be performed at the same time by punching the outer plate and forming the annular recess for the bushing shaft support by simply using a mold that has a concave shape on the inner surface and bulges to the outer surface. In addition to this, it is not necessary to perform machining such as grinding or milling to form an annular recess for supporting the bushing shaft on the outer plate, and the manufacturing burden of the chain can be reduced.

  In addition, there is no separate seal ring arranged in a pressed state like the conventional seal chain between the inner side surface of the outer plate of the chain body and the outer side surface of the inner plate. It is possible to avoid an increase in the number of chain parts while bending around and running around.

  Further, in the conventional seal chain, in order to prevent the sliding contact wear of the seal ring and maintain the sealing performance of the lubricating oil, it is necessary to perform a surface finishing process to reduce the surface roughness on the surface of the member that contacts the seal ring. However, in the oil-free chain with a joint link unit of the present invention, it is not necessary to perform surface finishing as in the conventional case, and the manufacturing burden of the chain can be reduced.

  The present invention provides an inner link formed by press-fitting both ends of a pair of front and rear bushes into a bush press-fitting hole of a pair of left and right inner plates, and both ends of a pair of front and rear connecting pins respectively penetrating into the bush. A chain body in which outer links formed by press-fitting and fitting into pin press-fitting holes of the plate are alternately connected in the longitudinal direction of the chain, and a pair of front and rear joint pins and joint pins respectively penetrating through the bushes positioned at both ends of the chain body. A press-fit plate that press-fits the base end portion into a pair of front and rear joint pin press-fit holes, a loose-fit plate that loosely fits the front-end portion of the joint pin into a pair of front and rear joint pin holes, and a joint pin that protrudes from the outer surface of the free-fit plate And a joint link unit for connecting the both ends of the chain body to each other, and positioning the inner end of the bush. In the oil-free chain with a joint link unit, in which lubricating oil is sealed between the outer periphery of the joint pin and the connecting pin, the bush protruding end part that protrudes partly from the outer surface of the inner plate located at both ends of the chain body Are respectively supported by annular recesses for supporting the bushing shaft that are recessed on the inner side surfaces of the press-fitting plate and the loose-fitting plate of the joint link unit and bulge to the outer side in an offset state. An outer peripheral surface of the joint pin in a state where an elastic seal member for preventing external leakage of the lubricating oil from between the inner peripheral surface of the hole and the outer peripheral surface of the joint pin is interposed between the loose fitting plate and the joint fastening means. Are closely fitted to each other, greatly reducing the chain manufacturing burden while avoiding a decrease in plate strength, and connecting the joint link unit during chain operation. The external leakage of the lubricating oil enclosed between the pin and the bushing of the chain body and the entry of external dust are surely prevented, and the inner peripheral surface of the joint pin hole of the loose fitting plate and the outer peripheral surface of the joint pin are In addition to preventing leakage of lubricating oil from the gap, the loose-fitting plate is securely positioned in the width direction of the chain, and further, external leakage of lubricating oil enclosed between the connecting pin and bushing of the chain body and intrusion of external dust Any specific embodiment may be used as long as it prevents the above.

  For example, the non-lubricated chain with a joint link unit of the present invention may be a roller chain or a bush chain, but in the case of a roller chain, the mesh with the sprocket is smooth. It is more preferable because it prevents wear of the chain.

  The specific material of the elastic seal member used in the oil-free chain with the joint link unit of the present invention is any material such as synthetic rubber, natural rubber, and synthetic resin as long as it has oil resistance, wear resistance, and elasticity. The fixing means to the outermost side of the loose fitting plate may be any means such as adhesion or baking.

  Further, specific fastening means for fastening the joint pin of the joint link unit incorporated in the oil-free chain with the joint link unit of the present invention to the loose fitting plate is fitted in the clip fitting groove formed at the tip of the joint pin. Any of a clip to be attached, a split pin penetrating through a through hole formed at the tip of the joint pin, a spring pin penetrating through a through hole formed at the tip of the joint pin, and the like may be used.

In addition, the specific embodiment of the bushing of the chain body incorporated in the oil-free chain with a joint link unit of the present invention is a normal bushing that has not been subjected to any processing, and metal powder so that it has innumerable pores inside. It may be any of bushes molded from 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 lubricating oil, When a bush made of sintered oil-impregnated metal material is used, the bush exhibits excellent release characteristics of the lubricating oil, i.e., due to centrifugal force generated by circular running during chain operation, etc. Since the lubricating oil impregnated in the innumerable pores formed in the outer wall gradually oozes between the inner peripheral surface of the bush and the outer peripheral surface of the joint pin and the connecting pin, the inner peripheral surface of the bush and the joint pin and the connecting pin The sliding contact wear with the outer peripheral surface can be reduced. In particular, the sintered oil-impregnated metal material described above compresses and forms a mixed metal powder containing iron, copper, nickel, chrome molybdenum steel, etc., and 6.0 g. / Cm ^{3 to} 7.0 g / cm ³ , when sintered at a sintering density, the bushing has tough performance and a lot of lubrication for receiving shear and impact forces due to chain tension The oil-impregnated performance and the sustained-release performance for supplying lubricating oil between the bushing, the joint pin, and the connecting pin for a long period of time by impregnating oil are well balanced and can be sufficiently exhibited.

  Further, the specific type of lubricating oil used in the oil-free chain with a joint link unit of the present invention may be any as long as it has lubricity and deterioration resistance, and in particular, poly α-olefin. When synthetic oils based on synthetic hydrocarbons such as polyol esters are used, they exhibit excellent viscosity, lubricity, and deterioration resistance, and clog pores formed inside the bush. Without causing them, the bushing oozes out between the bushing, the joint pin, and the connecting pin over a long period of time, and the sliding contact wear can be suppressed.

  Lubricating oil is also applied between the inner peripheral surface of the chain body bush and the outer peripheral surface of the connecting pin of the chain body, and between the inner peripheral surface of the chain main body bushing and the outer peripheral surface of the joint pin of the joint link unit. When the oil sump groove to be supplied is engraved on the outer peripheral surface of the joint pin and connecting pin, or the inner peripheral surface of the bush, or the outer peripheral surface of the joint pin and connecting pin and the inner peripheral surface of the bush, Since more lubricant is sealed and lubricant is continuously supplied between the joint pin and the connection pin and the bushing, sliding wear on the outer peripheral surface of the joint pin and the connection pin and the inner peripheral surface of the bushing is prolonged. Thus, chain wear elongation can be further prevented.

  Also, the inner surface of the outer plate of the chain body, the inner surface of the press-fitting plate and the loose-fitting plate of the joint link unit, and the outer surface of the inner plate of the chain body are so-called labyrinth rough surfaces that form a labyrinth structure. When a rough surface capable of forming a structure is provided, a labyrinth structure for oil sump is formed between the inner surface and the outer surface, so that it is injected between the joint pin and the connecting pin and the bush. The sealing effect of the lubricating oil can be further improved, and the lubricating oil injected between the bushing, the joint pin and the connecting pin can be prevented from leaking to the outside and dust can be prevented from entering from the outside. .

And about the concrete aspect of the annular recessed part for bushing shaft supports formed in the loose fitting plate used in the oil-free chain with a joint link unit of this invention, a press-fit plate, and an outer plate, the bulging surface is from a seat surface. It is preferable that the section modulus of the stepped portion formed in each plate is designed to be larger than the section modulus of the other plate portions by having a large outer diameter.
Further, the specific dimensional relationship regarding the inner diameter and outer diameter of the bush used in the oil-free chain with the joint link unit of the present invention, the outer diameter of the connecting pin, the outer diameter of the joint pin, and the inner diameter of the annular recess for supporting the bushing shaft described above. When the chain is subjected to a tensile force in the direction of travel of the chain, that is, when the inner link is unevenly distributed in the direction of travel of the chain with respect to the outer link and joint link unit, It is more preferable that the outer peripheral surface is designed to completely prevent contact between the outer peripheral surface of the bushing projecting end and the inner peripheral surface of the bushing shaft supporting annular recess.
Further, the length of the bush used in the oil-free chain with a joint link unit of the present invention in the chain width direction, the distance between the inner surfaces of the outer plates spaced apart in the chain width direction by a pair of left and right, and spaced in the chain width direction The specific dimensional relationship regarding the mutual distance between the inner surface of the loose-fitting plate and the inner surface of the press-fitting plate and the counterbore depth in the chain width direction of the aforementioned annular recess for bushing shaft support is as follows. To prevent the bushing protruding end from detaching from the bushing shaft support annular recess even when the inner link is skewed, swung, or offset in the chain width direction with respect to the outer link and joint link unit. Are preferably designed.

Hereinafter, an oil-free chain 100 with a joint link unit 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 an oil-free chain with a joint link unit according to a first embodiment of the present invention, and FIG. 2 is an exploded view of the oil-free chain with a joint link unit shown in FIG. 3 is a cross-sectional view of the oil-free chain with a joint link unit shown in FIG. 1, and FIG. 4 is a perspective view showing a modification of the joint fastening means.

  First, an oil-free chain 100 with a joint link unit according to a first embodiment of the present invention includes a chain main body 110 and a joint link unit that connects both ends of the chain main body 110 to each other as shown in FIGS. 120.

  As shown in FIGS. 1 and 2, the chain main body 110 has an inner link 114 formed by press-fitting both ends of a pair of front and rear bushes 112 fitted with rollers 111 into bush press-fit holes of a pair of left and right inner plates 113. And outer links 117 formed by press-fitting both ends of a pair of front and rear connecting pins 115 penetrating into the bush 112 into pin press-fitting holes of a pair of left and right outer plates 116 are alternately connected in the longitudinal direction of the chain. Is made up of.

Further, as shown in FIGS. 1 to 3, the joint link unit 120 includes a pair of front and rear joint pins 121 penetrating through the bushes 112 positioned at both ends of the chain main body 110 and a base end portion of the joint pin 121 in the front and rear directions. A press-fit plate 122 that is press-fitted into a pair of joint pin press-fit holes, a loose-fit plate 123 that loosely fits the tip of the joint pin 121 into a pair of front and rear joint pin holes, and a joint that protrudes from the outer surface of the loose-fit plate 123 A clip serving as a coupling fastening means 124 that is fitted in a clip fitting groove 121d formed at the tip of the pin 121 and positions and fastens the tip of the joint pin 121 to the outer surface of the loose-fitting plate 123. Has been.
Note that the above-described loose fitting plate 123 is generally referred to as a joint plate.

  And between the inner peripheral surface of the bush 112 of the chain body 110 and the outer peripheral surface of the connecting pin 115 of the chain main body 110, and the outer periphery of the inner peripheral surface of the bush 112 of the chain main body 110 and the joint pin 121 of the joint link unit 120. Lubricating oil is sealed between the surfaces.

  As the joint fastening means 124 for fastening the joint pin 121 to the loose fitting plate 123, a split pin that penetrates through a through hole formed at the tip of the joint pin 121 as shown in FIG. Alternatively, a spring pin that penetrates through a through hole formed at the tip of the joint pin 121 may be employed.

  Therefore, the bush 112 and the outer plate 116 of the chain main body 110, the press fitting plate 122 and the loose fitting plate 123 of the joint link unit 120, and the elastic seal member 130 are the most characteristic features of the oil-free chain 100 with the joint link unit of this embodiment. A typical embodiment will be described in detail with reference to FIGS.

  First, as shown in FIG. 1 and FIG. 2, the outer plate 116 of the chain body 110 has a concave inner surface, that is, a bush shaft that has been recessed and bulged to the outer surface in an offset state. An annular recess 116 a is provided, and this bushing shaft support annular recess 116 a surrounds and supports the bush protruding end 112 a that partially protrudes from the outer surface of the inner plate 113 of the chain body 110.

  Further, as shown in FIGS. 1 to 3, the press-fit plate 122 and the loose-fitting plate 123 of the joint link unit 120 have an annular recess 122a for bushing shaft support that has an inner surface recessed and bulged to the outer surface in an offset state. , 123a, and the bushing shaft supporting annular recesses 122a, 123a surround and support the bushing protruding end portion 112a partially protruding from the outer surface of the inner plate 113 located at both ends of the chain body 110 described above. ing.

  The “offset state” in the oil-free chain 100 with a joint link unit of the present invention means that the annular recesses 116a, 122a, 123a for bushing shafts and the other plate portions are shifted to form a stepped shape. It means that there is.

2 and 3, the flat elastic seal member 130 having a pin hole at the center is closely fitted to the outer peripheral surface of the joint pin 121, and the loose fitting plate 123 and the joint are used. It is interposed between the fastening means 124, that is, the outer peripheral surface of the joint pin 121 is fitted to the outer peripheral surface of the loose fitting plate 123 with the inner peripheral edge of the pin hole being in close contact, The external leakage of the lubricating oil from the inner peripheral surface of the joint pin hole of the plate 123 and the outer peripheral surface of the joint pin 121 is prevented.
The specific mode of the elastic seal member 130 is not limited to the flat shape having the pin hole as the center as described above, and an O-ring or the like may be employed, for example.

Further, the loose fitting plate 123 of the joint link unit 120 has an annular coining portion 123b formed by coining around the joint pin hole, and the chain tensile force is applied to the loose fitting plate 123 via the joint pin 121. The fatigue strength around the joint pin hole, which tends to cause fatigue failure when acting, is improved.
The “coining process” in the oil-free chain 100 with a joint link unit of the present invention means a process of improving the strength of the compressed part by partially compressing the material.

In the oil-free chain 100 with the joint link unit of the present embodiment obtained in this way, the press-fitting plate 122 and the loosely fitting plate 123 of the joint link unit 120 are recessed on the inner side surface and bulged to the outer side surface in an offset state. Further, the bushing shaft support annular recesses 122a and 123a are provided, and the bushing shaft support annular recesses 122a and 123a partially protrude from the outer surface of the inner plate 113 located at both ends of the chain body 110. 112a is supported by Go.
Accordingly, the labyrinth structure L1 for oil sump in which the leakage path of the lubricating oil generated between the bushing protruding end portion 112a and the bushing shaft support annular recesses 122a and 123a is bent in a complicated manner and exhibits an oil sump function, and Thus, the lubricating oil sealed between the bush 112 and the joint pin 121 due to the centrifugal force generated by the circular running at the time of the chain operation becomes the outer surface of the inner plate 113, the press-fit plate 122, and the loose fitting plate 123. Since it suppresses external leakage from between the inner side surface and the entry of external dust, it occurs between the inner peripheral surface of the bush 112 of the chain body 110 and the outer peripheral surface of the joint pin 121 of the joint link unit 120. It is possible to reduce wear damage that tends to occur and prevent chain wear elongation over a long period of time.

Moreover, the annular recesses 122a and 123a for bushing shaft support are formed in an offset state in which the inner side surfaces of the press-fitting plate 122 and the loose fitting plate 123 of the joint link unit 120 are recessed and bulged to the outer side surface.
Therefore, the section modulus of the bushing shaft supporting annular recesses 122a and 123a and the section modulus of the other plate portions are substantially the same, so that the press-fitting plate 122 and free play are formed by forming the bushing shaft supporting annular recesses 122a and 123a. The strength reduction of the fitting plate 123 can be suppressed, and when the press-fitting process of the press-fitting plate 122 and the loose fitting plate 123 is performed, the inner side surfaces of the press-fitting plate 122 and the loose fitting plate 123 are recessed to bulge to the outer side. Since the press-in plate 122 and the loose fitting plate 123 can be punched out and the bushing shaft support annular recesses 122a and 123a can be simultaneously formed by using only the shape mold, the press-in plate 122 and the loose fitting plate 123 can be simultaneously formed. Separately from the punching of the ring, the bushing shaft supporting annular recesses 122a, 123a Mechanical processing such as grinding or milling to form pressed plates 122 and there is no need to apply loosely plate 123, can reduce the production burden of the chain.

The elastic seal member 130 is interposed between the loose fitting plate 123 and the joint fastening means 124 in a state in which the elastic seal member 130 is closely fitted to the outer peripheral surface of the joint pin 121.
Therefore, the lubricating oil injected between the bush 112 and the joint pin 121 is prevented from leaking to the tip end side of the joint pin 121 along the outer peripheral surface of the joint pin 121 and external dust is prevented from leaking to the outer periphery of the joint pin 121. Intrusion between the bush 112 and the joint pin 121 along the surface is avoided, so that an occurrence occurs between the inner peripheral surface of the bush 112 of the chain body 110 and the outer peripheral surface of the joint pin 121 of the joint link unit 120. It is possible to reduce the wear damage and prevent wear elongation of the chain over a long period of time.

  Further, since the elastic seal member 130 is disposed between the loose fitting plate 123 and the joint fastening means 124, that is, on the outer surface side of the loose fit plate 123, the inner link 114 of the chain main body 110, the joint link unit 120, Unlike the case where the elastic seal member 130 is disposed on the inner surface side of the loosely fitting plate 123 which is likely to be affected by the relative bending movement of the chain member, excessive sliding between the other chain member and the elastic seal member 130 during the operation of the chain. Since dynamic contact can be avoided, wear damage of the elastic seal member 130 can be prevented, and deterioration of the sealing effect due to wear damage of the elastic seal member 130 can be avoided.

  Further, since the elastic seal member 130 closely fitted to the joint pin 121 on the outer surface side of the loose fitting plate 123 regulates the swinging or shifting of the loose fitting plate 123 outward in the chain width direction. The relative positional relationship between the bushing shaft supporting annular recess 123a formed in the fitting plate 123 and the bushing projecting end 112a supported by the bushing shaft supporting annular recess 123a is held within a predetermined range. The oil sump function by the oil sump labyrinth structure L1 constituted by the bush protruding end portion 112a and the bush shaft support annular recess portion 123a can be reliably exhibited.

  Further, since the elastic seal member 130 is made of an elastic body, the elastic seal member 130 is elastically deformed flexibly with respect to the joint pin 121 when the chain is assembled. Therefore, the assembly work to the joint pin 121 can be performed without requiring an excessive work load. Can be easily achieved.

  Further, in the conventional seal chain, the surface roughness is reduced on the inner surface of the outer plate and the joint plate and the outer surface of the inner plate in order to prevent sliding contact wear of the seal ring and maintain the sealing performance of the lubricating oil. Although it is necessary to perform surface finishing, in the oil-free chain 100 with a joint link unit of the present invention, it is not necessary to perform surface finishing as in the conventional case, and the manufacturing burden of the chain can be reduced.

  Further, since the seal ring is not disposed in a pressed state between the outer side surface of the inner plate 113 and the inner side surfaces of the press-fitting plate 122 and the loosely fitting plate 123, it is smooth when the chain is in operation. You can bend around and run around.

Further, the outer plate 116 of the chain main body 110 includes a bushing shaft supporting annular recess 116a in which the inner surface is recessed and bulges to the outer surface in an offset state, and the bushing shaft supporting annular recess 116a is provided in the chain body 110. The bushing protruding end portion 112a partially protruding from the outer surface of the inner plate 113 is surrounded and supported.
Therefore, the oil reservoir labyrinth structure L3 in which the leakage path of the lubricating oil generated between the bushing projecting end portion 112a and the bushing shaft supporting annular recess 116a is bent in a complicated manner to provide an oil reservoir function. The lubricating oil enclosed between the bushing 112 and the connecting pin 115 due to centrifugal force generated by the circular traveling during the chain operation is externally provided between the outer surface of the inner plate 113 and the inner surface of the outer plate 116. Since it suppresses leakage and suppresses intrusion of external dust, it reduces wear damage that tends to occur between the inner peripheral surface of the bush 112 of the chain main body 110 and the outer peripheral surface of the connecting pin 115 of the chain main body 110. Chain wear elongation can be prevented over a long period of time.

Further, the bush shaft support annular recess 116a is formed in an offset state in which the inner surface of the outer plate 116 of the chain body 110 is recessed and bulged to the outer surface.
Accordingly, the section modulus of the bushing shaft support annular recess 116a and the section modulus of the other plate portions are approximately the same, and therefore, the strength reduction of the outer plate 116 due to the formation of the bushing shaft support annular recess 116a can be suppressed. In addition, when the outer plate 116 is subjected to press punching, the outer plate 116 is punched and the bushing shaft is supported only by using a mold having a shape in which the inner surface of the outer plate 116 is recessed and bulged to the outer surface. Since the annular recess 116a can be formed at the same time, the outer plate 116 needs to be subjected to mechanical processing such as grinding or milling to form the bush shaft support annular recess 116a separately from the punching of the outer plate 116. The chain manufacturing burden can be reduced.

  Further, since a seal ring arranged in a pressed state like a conventional seal chain is not provided between the inner surface of the outer plate 116 of the chain body 110 and the outer surface of the inner plate 113, the chain During operation, it bends smoothly and runs around, and an increase in the number of chain parts can be avoided.

  Further, in the conventional seal chain, in order to prevent the sliding contact wear of the seal ring and maintain the sealing performance of the lubricating oil, it is necessary to perform a surface finishing process to reduce the surface roughness on the surface of the member that contacts the seal ring. However, in the oil-free chain 100 with a joint link unit of the present invention, it is not necessary to perform surface finishing as in the conventional case, and the manufacturing burden of the chain can be reduced.

The loose-fitting plate 123 has an annular coining portion 123b formed by coining around the joint pin hole.
Therefore, since the fatigue strength around the joint pin hole, which tends to cause fatigue failure when the chain tensile force acts on the loose fitting plate 123 via the joint pin 121, the chain life can be maintained over a long period of time. The effect is enormous.

Next, FIG. 5 shows a modification of the oil-free chain 100 with a joint link unit according to the first embodiment of the present invention.
Here, the configuration other than the joint pin 121 in the oil-free chain 100 with a joint link unit, which is a modification of the first embodiment, is exactly the same as the oil-free chain 100 with a joint link unit in the first embodiment described above. The description of the components other than the joint pin 121 is omitted.

Accordingly, a description will be given of a joint pin 121 that is most characteristic of the oil-free chain 100 with a joint link unit, which is a modification of the first embodiment.
That is, as shown in FIG. 5, a small-diameter portion 121 a for loosely fitting a plate having a smaller diameter than the base end portion of the joint pin 121 formed by reducing the diameter of the distal end portion is formed on the outer peripheral surface of the joint pin 121. The loose-fitting plate 123 is externally fitted to the plate loose-fitting small-diameter portion 121a with play.

  Then, as shown in FIG. 5, the loosely fitting plate 123 uses the elastic seal member 130 closely fitted to the joint pin 121, and the base end portion of the joint pin 121 and the small diameter portion 121 a for plate loose fitting. Are fixed in the chain width direction in a state where the inner peripheral edge of the joint pin hole of the loose fitting plate 123 is in contact with the stepped portion 121c formed between the inner peripheral surface of the joint pin hole of the loose fitting plate 123 and The space between the outer peripheral surface of the joint pin 121 is completely sealed.

  In this modified example, as shown in FIG. 5, the joint pin hole inner peripheral edge of the loosely fitting plate 123 is formed in a step portion 121 c formed between the proximal end portion of the joint pin 121 and the small diameter portion 121 a for loosely fitting the plate. Between the base end portion of the joint pin 121 and the plate loosely fitting small diameter portion 121a, and the joint pin hole inner peripheral portion of the loosely fitting plate 123. A gap may be provided, that is, the loose fitting plate 123 may be disposed without being completely fixed in the chain width direction. In this case, the gap between the joint pin 121 and the loose fitting plate 123 may be provided. Since the leakage path of the generated lubricating oil is bent in a complicated manner to form an oil pool labyrinth structure L2, the lubricating oil from the inner peripheral surface of the joint pin hole of the loose fitting plate 123 and the outer peripheral surface of the joint pin 121 is External leakage and The parts dust intrusion has to be reliably prevented.

In the oil-free chain 100 with a joint link unit, which is a modification of the first embodiment obtained in this way, the loosely fitting plate 123 is connected to the small diameter portion 121a for loosely fitting the plate formed at the tip of the joint pin 121. It is loosely fitted.
Therefore, as described above, the elastic seal member 130 is closely fitted to the joint pin 121 on the outer surface side of the loosely fitting plate 123, and the swinging or shifting of the loosely fitting plate 123 to the outside in the chain width direction is restricted. In addition, the joint pin hole inner peripheral edge portion of the loose fitting plate 123 is brought into contact with the stepped portion 121c formed between the base end portion of the joint pin 121 and the small diameter portion 121a for loose plate fitting. Since swinging or shifting to the inside in the chain width direction can be restricted, swinging or shifting of the loose fitting plate 123 to the outside in the chain width direction and to the inside in the chain width direction, that is, both sides in the chain width direction, can be controlled. Relative position between the bushing shaft supporting annular recess 123a of the fitting plate 123 and the bushing protruding end portion 112a supported by the bushing shaft supporting annular recess 123a. The engagement member can be held more securely, and is formed between the proximal end portion of the joint pin 121 and the small diameter portion 121a for loose plate engagement using the elastic seal member 130 press-fitted to the joint pin 121 as described above. By fixing the loose fitting plate 123 in the chain width direction with the stepped portion 121c in contact with the inner peripheral edge of the joint pin hole of the loose fitting plate 123, the inner peripheral surface of the loose joint plate 123 and the joint pin The effect is enormous, such as a complete seal between the outer peripheral surface of 121 and the like.

Next, an oil-free chain 200 with a joint link unit according to a second embodiment of the present invention will be described with reference to FIG.
Here, the configuration other than the elastic seal member 230 in the oil-free chain 200 with a joint link unit according to the second embodiment of the present invention is exactly the same as the oil-free chain 100 with a joint link unit in the first embodiment described above. Therefore, the description about the oil-free chain 100 with the joint link unit of the first embodiment, and the configuration other than the elastic seal member 230 by replacing the reference numerals in the 100s shown in FIGS. 1 to 5 with the reference numerals in the 200s. Will not be described.

Therefore, a specific form of the elastic seal member 230, which is the most characteristic feature of the oil-free chain 200 with a joint link unit of this embodiment, will be described in detail.
That is, as shown in FIG. 6, the outermost surface of the loosely fitting plate 223 in a state where the flat elastic seal member 230 having the pin hole in the center is in close contact with the outer peripheral surface of the joint pin 221, that is, It is fixed to the seating surface of the bushing shaft supporting annular recess 223a bulging on the outer surface side of the loosely fitting plate 223, and the inner peripheral surface of the joint pin hole of the loosely fitting plate 223 and the outer peripheral surface of the joint pin 221 It prevents the external leakage of the lubricating oil from between.

The oil-free chain 200 with the joint link unit of the present embodiment thus obtained is fixed to the outermost surface of the loosely fitting plate 223 in a state where the elastic seal member 230 is in close contact with the outer peripheral surface of the joint pin 221. Has been.
Therefore, the inner peripheral edge of the pin hole of the elastic seal member 230 that is in close contact with the outer peripheral surface of the joint pin 221 seals between the inner peripheral surface of the joint pin hole of the loosely fitting plate 223 and the outer peripheral surface of the joint pin 221 so as to lubricate. As well as preventing external leakage of the dust and intrusion of external dust, chain wear and elongation can be prevented over a long period of time.

  Further, since the elastic seal member 230 is disposed between the loose fitting plate 223 and the coupling fastening means 224, that is, on the outer surface side of the loose fitting plate 223, the inner link 214 of the chain main body 210, the joint link unit 220, and the like. Unlike the case where the elastic seal member 230 is disposed on the inner surface side of the loose-fitting plate 223, which is likely to be affected by the relative bending motion of the chain, excessive sliding between the other chain member and the elastic seal member 230 during operation of the chain. Since the dynamic contact can be avoided, wear damage of the elastic seal member 230 can be prevented, and deterioration of the sealing effect due to wear damage of the elastic seal member 230 can be avoided.

  Further, since the elastic seal member 230 is made of an elastic body, the elastic seal member 230 is flexibly elastically deformed with respect to the joint pin 221 when the chain is assembled. Therefore, the assembly work to the joint pin 221 can be performed without requiring an excessive work load. Can be easily achieved.

  Further, since the elastic seal member 230 is fixed to the loosely fitting plate 223, such an elastic seal member 230 and the loosely fitted plate 223 can be handled integrally, so that disassembly and assembly work such as chain cut-off is performed. Can be easily achieved.

  Further, as described above, the elastic seal member 230 integrated with the loose fitting plate 223 is closely fitted to the joint pin 221, thereby positioning the loose fitting plate 223 in the chain width direction and the loose fitting plate 223. Is prevented from swinging or offset in the chain width direction, and the bushing shaft support annular recess 223a formed in the loose fitting plate 223 and the bushing protruding end portion 212a supported by the bushing shaft support annular recess 223a The oil reservoir function by the oil reservoir labyrinth structure L1 constituted by the bush protruding end portion 212a and the bush shaft supporting annular recess portion 223a is reliably exerted while keeping the relative positional relationship within a predetermined range. The effect is enormous.

Next, an oil-free chain 300 with a joint link unit according to a third embodiment of the present invention will be described with reference to FIG.
Here, the configuration other than the elastic seal member 330 in the oil-free chain 300 with joint link unit according to the third embodiment of the present invention is exactly the same as the oil-free chain 100 with joint link unit in the first embodiment described above. Therefore, the description about the oil-free chain 100 with the joint link unit of the first embodiment, and the configuration other than the elastic seal member 330 by replacing the reference numerals in the 100s shown in FIGS. 1 to 5 with the reference numerals in the 300s. Will not be described.

Therefore, a specific form of the elastic seal member 330 that is most characteristic of the oil-free chain 300 with the joint link unit of this embodiment will be described in detail.
That is, as shown in FIG. 7, a flat elastic seal member 330 having a pin hole as a center has a pin hole inner peripheral portion of the elastic seal member 330 formed on the outer peripheral surface of the joint pin 321. It is fixed to the outermost surface of the loosely fitting plate 323 in a state where it is fitted in the wearing groove 321b, that is, the seating surface of the annular recess 323a for bushing shaft support formed bulging on the outer side of the loosely fitting plate 323. The external leakage of the lubricating oil from the inner peripheral surface of the joint pin hole of the loose fitting plate 323 and the outer peripheral surface of the joint pin 321 is prevented.

  In addition, about the specific shape of the groove part 321b of the sealing member fitting formed in the joint pin 321 and the inner peripheral edge part of the pin hole of the elastic seal member 330, the groove having the rectangular cross section and the inner peripheral edge part as shown in FIG. Although formed, it may be formed of a groove having a semispherical cross section as shown in FIG. 8 and an inner peripheral edge. In this case, a loose fitting plate 323 integrated with the elastic seal member 330 is connected to the joint pin 321. The pin hole inner peripheral edge portion of the elastic seal member 330 formed in a semispherical cross section is not caught in the seal member fitting groove portion 321b or the clip fitting groove portion 321d, and is flexibly elastically deformed. Therefore, the assembling work for the seal member fitting groove 321b can be achieved more smoothly.

In the oil-free chain 300 with a joint link unit of the present embodiment obtained in this way, the elastic seal member 330 is a seal in which the inner peripheral edge of the pin hole of the elastic seal member 330 is formed on the outer peripheral surface of the joint pin 321. It is fixed to the outermost surface of the loosely fitting plate 323 in a state of being fitted in the member fitting groove 321b.
Therefore, the inner peripheral edge of the pin hole of the elastic seal member 330 seals between the inner peripheral surface of the joint pin hole of the loosely fitting plate 323 and the outer peripheral surface of the joint pin 321 to prevent the external leakage of the lubricating oil and external dust. The chain wear elongation can be prevented over a long period of time, and the inner peripheral edge of the pin hole of the elastic seal member 330 is fitted into the seal member fitting groove 321b. Since the contact area between the groove 321b and the inner peripheral edge of the pin hole of the elastic seal member 330 is increased and the sealing effect by the elastic seal member 330 is improved, the external leakage of the lubricating oil and the entry of external dust can be prevented more reliably. it can.

  Further, since the elastic seal member 330 is disposed between the loose fitting plate 323 and the joint fastening means 324, that is, on the outer surface side of the loose fit plate 323, the inner link 314 of the chain main body 310, the joint link unit 320, Unlike the case where the elastic seal member 330 is disposed on the inner surface side of the loosely-fitting plate 323 that is likely to be affected by the relative bending motion of the chain, excessive sliding between the other chain member and the elastic seal member 330 during the operation of the chain. Since the dynamic contact can be avoided, wear damage of the elastic seal member 330 can be prevented, and deterioration of the sealing effect due to wear damage of the elastic seal member 330 can be avoided.

  Further, since the elastic seal member 330 is made of an elastic body, the elastic seal member 330 is elastically deformed flexibly with respect to the joint pin 321 when the chain is assembled, so that it is formed on the joint pin 321 without requiring an excessive work load. The assembling work for the sealing member fitting groove 321b can be easily achieved.

  Further, since the elastic seal member 330 is fixed to the loosely fitting plate 323, the elastic seal member 330 and the loosely fitted plate 323 can be handled integrally, so that disassembly and assembly work such as chain cut-off can be performed. Can be easily achieved.

  Further, when a gap is generated between the seal member fitting groove 321b and the pin hole inner peripheral edge of the elastic seal member 330 due to wear or the like of the elastic seal member 330, such a seal member fitting groove is provided. The oil reservoir labyrinth structure L2 exhibits an oil reservoir function because the gap formed between the 321b and the inner peripheral edge of the pin hole of the elastic seal member 330 exhibits a complicatedly bent labyrinth structure L2. Therefore, it is possible to prevent external leakage of lubricating oil and intrusion of external dust.

  Further, the elastic sealing member 330 fixed to the loose fitting plate 323 is fitted into the sealing member fitting groove 321b formed on the outer peripheral surface of the joint pin 321, so that the loose fitting plate 323 is reliably positioned in the chain width direction. This prevents the loose fitting plate 323 from swinging or shifting in the chain width direction, so that the bushing shaft supporting annular recess 323a formed in the loose fitting plate 323 and the bushing supported by the bushing shaft supporting annular recess 323a are surrounded. An oil sump labyrinth structure L1 configured by the bushing projecting end portion 312a and the bushing shaft supporting annular recess 323a is held in an oil reservoir while holding the relative positional relationship with the projecting end portion 312a within a predetermined range. Its effects are enormous, as it can function reliably.

Next, an oil-free chain 400 with a joint link unit according to a fourth embodiment of the present invention will be described with reference to FIGS.
Here, in the oil-free chain 400 with a joint link unit according to the fourth embodiment of the present invention, the configuration other than the elastic seal member 430, the joint fastening means 424 and the joint pin 421 is the same as the joint link unit of the first embodiment described above. Since it is exactly the same as the oilless chain 100 with a joint, the description of the oilless chain 100 with a joint link unit of the first embodiment and the reference numerals in the 100s shown in FIGS. Therefore, the description of the configuration other than the elastic seal member 430, the joint fastening means 424, and the joint pin 421 is omitted.

Therefore, specific forms of the elastic seal member 430, the joint fastening means 424, and the joint pin 421, which are the most characteristic features of the oil-free chain 400 with the joint link unit of this embodiment, will be described in detail.
That is, as shown in FIG. 9, a flat elastic seal member 430 having a pin hole as a center is fitted with a seal member fitting in which the inner peripheral edge of the pin hole of the elastic seal member 430 is formed on the outer peripheral surface of the joint pin 421. It is fixed to the outermost surface of the loosely fitting plate 423 in a state where it is fitted in the wearing groove 421b, that is, the seating surface of the annular recess 423a for bushing shaft support formed bulging on the outer side of the loosely fitting plate 423. The external leakage of the lubricating oil from the inner peripheral surface of the joint pin hole of the loose fitting plate 423 and the outer peripheral surface of the joint pin 421 is prevented.

  The specific shape of the seal member fitting groove 421b formed on the joint pin 421 and the inner peripheral edge of the pin hole of the elastic seal member 430 is as follows. Although it is formed, it may be formed by a groove having a semispherical cross section and an inner peripheral edge. In this case, when the loose fitting plate 423 integrated with the elastic seal member 430 is assembled to the joint pin 421. Since the inner peripheral edge of the pin hole of the elastic seal member 430 formed in a semispherical cross section is elastically deformed flexibly while avoiding being caught by the seal member fitting groove 421b and the clip fitting groove 421d, the seal member is fitted. Assembling work for the wearing groove 421b can be achieved more smoothly.

  Further, as shown in FIGS. 9 to 11, the joint fastening means 424 includes a clip body portion 424a fitted in a clip fitting groove portion 421d formed at the distal end portion of the joint pin 421, and the clip body portion 424a. A lip portion 424b that stands from the outer edge toward the outer surface of the loose fitting plate 423, and protrudes from the outer surface of the loose fitting plate 423 by fitting the clip body portion 424a into the clip fitting groove portion 421d. The tip of the joint pin 421 can be easily and reliably positioned in the form of a clip on the outer surface of the loosely-fitting plate 423, and the elastic seal member 430 is covered with the lip portion 424b to prevent the elastic seal member 430 from being damaged. The reduction in the sealing effect that tends to occur due to damage to the member 430 can be avoided.

  Further, as shown in FIG. 9, a small-diameter portion 421a for loosely fitting a plate having a smaller diameter than the proximal end portion of the joint pin 421 formed by reducing the diameter of the distal end portion is formed on the outer peripheral surface of the joint pin 421. The loosely fitting plate 423 is externally fitted to the small diameter portion 421a for loosely fitting the plate with play.

  As shown in FIG. 9, the loose fitting plate 423 is configured such that the lip portion 424 b of the joint fastening means 424 is brought into contact with the outer surface of the loose fitting plate 423, so that the proximal end portion of the joint pin 421 and the plate The joint pin of the loose-fitting plate 423 is fixed in the chain width direction with the joint pin hole inner peripheral edge of the loose-fitting plate 423 in contact with the step portion 421c formed between the small-diameter part 421a for loose fitting. The space between the inner peripheral surface of the hole and the outer peripheral surface of the joint pin 421 is completely sealed.

  In this embodiment, as shown in FIG. 9, the joint pin hole inner peripheral edge of the loosely fitting plate 423 is formed on the step portion 421c formed between the proximal end portion of the joint pin 421 and the small diameter portion 421a for loosely fitting the plate. Between the base end portion of the joint pin 421 and the plate loose-fitting small-diameter portion 421a and the joint pin hole inner peripheral portion of the loose-fitting plate 423. A gap may be provided, that is, the loose fitting plate 423 may be disposed without being completely fixed in the chain width direction. In this case, the gap between the joint pin 421 and the loose fitting plate 423 may be provided. Since the leakage path of the generated lubricating oil is bent in a complicated manner to form the labyrinth structure L2 for oil reservoir, the lubricating oil from the inner peripheral surface of the joint pin hole of the loose fitting plate 423 and the outer peripheral surface of the joint pin 421 External leakage and It has become the parts dust-to more reliably prevented.

In the oil-free chain 400 with a joint link unit of the present embodiment obtained in this way, the elastic seal member 430 is a seal in which the inner peripheral edge of the pin hole of the elastic seal member 430 is formed on the outer peripheral surface of the joint pin 421. It is fixed to the outermost surface of the loosely fitting plate 423 in a state of being fitted into the member fitting groove 421b.
Therefore, the inner peripheral edge of the pin hole of the elastic seal member 430 seals between the inner peripheral surface of the joint pin hole of the loose-fitting plate 423 and the outer peripheral surface of the joint pin 421 to prevent external leakage of the lubricating oil and external dust. The chain wear elongation can be prevented over a long period of time, and the inner peripheral edge of the pin hole of the elastic seal member 430 is fitted into the seal member fitting groove 421b. Since the contact area between the groove portion 421b and the inner peripheral edge of the pin hole of the elastic seal member 430 is increased and the sealing effect by the elastic seal member 430 is improved, the external leakage of the lubricating oil and the entry of external dust can be prevented more reliably. it can.

  Further, since the elastic seal member 430 is disposed between the loose fitting plate 423 and the joint fastening means 424, that is, on the outer surface side of the loose fitting plate 423, the inner link 414 of the chain body 410, the joint link unit 420, Unlike the case where the elastic seal member 430 is disposed on the inner surface side of the loosely-fitting plate 423 which is likely to be affected by the relative bending movement of the other chain member, excessive sliding between the other chain member and the elastic seal member 430 during the chain operation. Since dynamic contact can be avoided, wear damage of the elastic seal member 430 can be prevented, and deterioration of the sealing effect due to wear damage of the elastic seal member 430 can be avoided.

  Further, since the elastic seal member 430 is made of an elastic body, the elastic seal member 430 is elastically deformed flexibly with respect to the joint pin 421 when the chain is assembled. Therefore, the assembly work to the joint pin 421 can be performed without requiring an excessive work load. Can be easily achieved.

  Further, since the elastic seal member 430 is fixed to the loosely fitting plate 423, such an elastic seal member 430 and the loosely fitted plate 423 can be handled integrally, so that disassembly and assembling work such as chain cut-off can be performed. Can be easily achieved.

  Further, when a gap is generated between the seal member fitting groove 421b and the pin hole inner peripheral edge of the elastic seal member 430 due to wear of the elastic seal member 430 or the like, such a seal member fitting groove is also provided. Since the gap formed between 421b and the inner peripheral edge of the pin hole of the elastic seal member 430 exhibits the oil reservoir labyrinth structure L2 that is complicatedly bent, the oil reservoir labyrinth structure L2 exhibits an oil reservoir function. Therefore, it is possible to prevent external leakage of lubricating oil and intrusion of external dust.

Further, the joint fastening means 424 has a lip portion 424b that stands from the clip body portion 424a toward the outer surface of the loose fitting plate 423, and the loose fitting plate 423 is formed at the distal end portion of the joint pin 421. The plate is loosely fitted into the small diameter portion 421a for loose fitting.
Therefore, in addition to restricting the swinging or shifting of the loose fitting plate 423 outward in the chain width direction by bringing the lip portion 424b of the joint fastening means 424 into contact with the outer surface of the loose fitting plate 423, the joint pin 421 The inner peripheral edge of the joint pin hole of the loose fitting plate 423 is brought into contact with the stepped portion 421c formed between the base end portion of the loose fitting plate 421a and the small diameter portion 421a for loosely fitting the plate, and the loosely fitting plate 423 is inward in the chain width direction. Since the swing or displacement can be restricted, the bushing shaft of the loose fit plate 423 is regulated by restricting the swing or displacement of the loose fit plate 423 to the outside in the chain width direction and the inside in the chain width direction, that is, both sides in the chain width direction. The relative positional relationship between the supporting annular recess 423a and the bushing projecting end 412a supported by the bushing shaft supporting annular recess 423a is more reliably maintained. In addition, the loosely fitting plate 423 is in a state in which the stepped portion 421c formed between the base end portion of the joint pin 421 and the plate loosely fitting small diameter portion 421a is in contact with the inner peripheral edge of the joint pin hole of the loosely fitting plate 423. Is fixed in the chain width direction, the inner peripheral surface of the joint pin hole of the loose fitting plate 423 and the outer peripheral surface of the joint pin 421 can be completely sealed.

  Then, as described above, by restricting the swinging or shifting of the loose fitting plate 423 to both sides in the chain width direction, the loose fitting plate 423 swings or shifts in the chain width direction, and the elastic seal member 430 is moved. The effect is enormous, for example, the sealing effect by the elastic seal member 430 can be stably exhibited by avoiding the release from the groove 421b for fitting the seal member and applying a shearing force to the elastic seal member 430.

BRIEF DESCRIPTION OF THE DRAWINGS The whole schematic diagram of the oil-free chain with a joint link unit which is 1st Example of this invention. FIG. 2 is an exploded view of the oil-free chain with the joint link unit shown in FIG. 1. Sectional drawing of the oil-free chain with a joint link unit shown in FIG. The perspective view which shows the modification of the fastening means for couplings. Sectional drawing which shows the modification of 1st Example. Sectional drawing of the oil-free chain with a joint link unit which is 2nd Example of this invention. Sectional drawing of the oil-free chain with a joint link unit which is 3rd Example of this invention. Sectional drawing which shows the modification of 3rd Example. The partial cross section figure which shows the oil-free chain with a joint link unit which is 4th Example of this invention. The perspective view which shows the fastening means for couplings. The top view which shows the state which mounted | wore the coupling fastening means.

Explanation of symbols

100, 200, 300, 400 ... Oil-free chain with joint link unit 110, 210, 310, 410 ... Chain body 111, 211, 311, 411 ... Roller 112, 212, 312, 412 ... Bushings 112a, 212a, 312a, 412a ... Bush protruding ends 113, 213, 313, 413 ... Inner plates 114, 214, 314, 414 ... Inner links 115, 215, 315, 415 ... Connections Pins 116, 216, 316, 416 ... outer plates 116a, 216a, 316a, 416a ... annular recesses for bushing shaft support 117, 217, 317, 417 ... outer links 120, 220, 320, 420 ...・ Joint link unit 121,221,321,421 ... Hand pin 121a, 421a ... Plate loose fitting small diameter part 321b, 421b ... Seal member fitting groove part 121c, 421c ... Step part 121d, 221d, 321d, 421d ... Clip fitting groove part 122, 222 322, 422 ... Press-fit plate 122a, 222a, 322a, 422a ... Annular recess for bushing shaft support 123, 223, 323, 423 ... Free fitting plate 123a, 223a, 323a, 423a ... Bushing shaft Supporting annular recesses 123b, 223b, 323b, 423b ... annular coining parts 124, 224, 324, 424 ... joint fastening means 424a ... clip body part 424b ... lip parts 130, 230, 330, 430... Elastic seal member L1, L2, L3 ... Labyrinth structure for oil reservoir

Claims (7)

Pins of a pair of left and right outer plates are connected to inner links formed by press-fitting both ends of a pair of front and rear bushes into bush press-fitting holes of a pair of left and right inner plates and a pair of front and rear connection pins penetrating into the bushes. A chain body in which outer links formed by press-fitting into the press-fitting holes are alternately connected in the longitudinal direction of the chain, a pair of front and rear joint pins penetrating through bushes located at both ends of the chain body, and a base of the joint pin A press-fit plate whose ends are press-fitted into a pair of front and rear joint pin press-fit holes, a loose-fit plate where the tip of the joint pin is loosely fitted into a pair of front and rear joint pin holes, and a joint protruding from the outer surface of the free-fit plate A joint link unit configured to connect the both ends of the chain body to each other, the fastening means for the joint positioning and fastening the tip of the pin to the outer surface of the loose fitting plate, In joint link unit with oil-free chain formed by sealing the lubricating oil between the inner and outer circumferential surfaces of the joint pin and the connecting pin Gerhard,
Bush projecting ends that partially protrude from the outer surface of the inner plate located at both ends of the chain body bulge to the outer surface in an offset state by recessing the inner surface of the press-fitting plate and loose fitting plate of the joint link unit. And are supported by the annular recesses for supporting the bushing shaft,
An elastic seal member that prevents external leakage of lubricating oil from between the inner peripheral surface of the joint pin hole of the loosely fitting plate and the outer peripheral surface of the joint pin is interposed between the loosely fitting plate and the joint fastening means. An oil-free chain with a joint link unit, which is tightly fitted to the outer peripheral surface of the joint pin in a closed state.   The oil-free chain with a joint link unit according to claim 1, wherein the elastic seal member is fixed to the outermost surface of the loose-fitting plate.   The joint link unit according to claim 1 or 2, wherein a pin hole inner peripheral edge portion of the elastic seal member is fitted in a seal member fitting groove portion formed on an outer peripheral surface of the joint pin. Oil-free chain with   The joint fastening means has a clip main body portion that is fitted into a clip fitting groove formed at a distal end portion of the joint pin, and a lip portion that stands from the clip main body portion toward the outer surface of the loose fitting plate. The oil-free chain with a joint link unit according to any one of claims 1 to 3, wherein the oil-free chain has a joint link unit.   The joint according to any one of claims 1 to 4, wherein the loosely fitting plate is loosely fitted to a small diameter portion for loosely fitting a plate formed by reducing the diameter of the distal end side of the joint pin. Oil-free chain with link unit.   6. The oil-free with joint link unit according to claim 1, wherein the loose-fitting plate has an annular coining portion formed by coining around a joint pin hole. chain. A bushing protruding end portion that partially protrudes from the outer surface of the inner plate of the chain body is formed by an annular recess for supporting the bushing shaft that is recessed from the inner surface of the outer plate of the chain body and bulges to the outer surface in an offset state. The oil-free chain with a joint link unit according to any one of claims 1 to 6, wherein the chain is supported by each other.

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