JP2010242954A - Sealed chain - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealed chain including an elastic sealing member capable of exerting an excellent sealing performance and the seal lifetime for a long period through avoidance of a damage to the elastic sealing member, maintaining the sealing performance even in case a wear damage etc. is generated on the sealing member, suppressing a drop of the strength of an outer plate, and enhancing the intrusion preventing function against iron ore having large particle size and weight, coal, gravel, external dust, etc. <P>SOLUTION: The sealed chain 100 includes an inner plate 110, a bushing 120, a coupling pin 140, the outer plate 150, and a seal mechanism 160, wherein the seal mechanism 160 is composed of an outside seal receiving member 161 having an outside ring 161a and an outside disc 161b, an inside seal receiving member 162 having an inside ring 162a, an inside disc 162b and a locating lip 162c, and the elastic sealing member 163 having a seal disc 163a and a seal lip 163b. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a seal chain used for conveyance (conveyor), power transmission (transmission), and the like, and more particularly to a seal chain used as a bucket conveyor chain used in a continuous unloader for unloading iron ore and coal.

  Seal chains are generally used in dusty atmospheres, and a seal mechanism is provided in the gap between the inner and outer plates of the chain to prevent leakage of lubricant enclosed in the gap between the connecting pin and bushing and intrusion of external dust. Various types of sealing mechanisms have been proposed.

  Conventionally, both ends of a pair of front and rear bushes are press-fitted into the bush press-fit holes of a pair of left and right inner link plates, and both ends of a pair of front and rear pins penetrating into the bush are paired with left and right outer links. There is known a seal chain in which outer links formed by press-fitting and fitting into pin press-fitting holes of a plate are alternately connected in the longitudinal direction of the chain, and a seal mechanism is disposed in a gap between the outer link plate and the inner link plate. (For example, refer to Patent Document 1).

  The seal mechanism of such a seal chain includes a seal receiving member that is arranged in contact with the inner link plate and has a plurality of annular grooves that are open toward the outer link plate on different radii, and the outer link. A seal plate that is fitted into an annular groove recessed in the plate and has a smooth surface on the side facing the inner link plate, and a plurality of annular grooves formed in the seal receiving member, respectively. And an elastic seal member having a lip portion in contact with a smooth surface.

Japanese Patent Laying-Open No. 2001-90790 (Claims, FIG. 2)

  In the conventional seal chain as described above, the lip portion formed on the elastic seal member is damaged due to the sliding contact with the seal plate installed in the concave groove formed on the outer link plate. In this case, the lubricant interposed in the gap between the inner peripheral surface of the bush and the outer peripheral surface of the pin leaks directly to the outside along the inner surface of the inner plate and the smooth surface of the seal plate. There was a problem that could not be maintained.

  In addition, since the lip portion formed on the elastic seal member protrudes from the annular groove formed on the seal receiving member and is in contact with the smooth surface of the seal plate, the outer link plate side end of the seal receiving member and the seal plate There has been a problem that foreign matters such as iron ore, coal, and gravel that have entered from the gap with the smooth surface directly collide with the lip portion of the elastic seal member and damage the lip portion of the elastic seal member.

  In order to avoid wear damage of the lip portion formed on the elastic seal member, the seal plate is placed on the inner side surface of the outer plate over the entire installation area of the seal mechanism in the gap between the outer link plate and the inner link plate. As a result, there is a problem in that the area near the pins of the outer link plate where stress is easily applied during chain driving is recessed, and the plate strength of the outer link plate is reduced.

  Therefore, the present invention solves the conventional problems. That is, the object of the present invention is to avoid the damage of the elastic seal member and exhibit excellent sealing performance and seal life over a long period of time. Maintains sealing performance even when wear damage occurs on the member, while suppressing the decrease in strength of the outer plate and preventing intrusion of iron ore, coal, gravel, external dust, etc. with large particle size and weight It is to provide an improved seal chain.

  According to the first aspect of the present invention, a pair of left and right inner plates, a pair of front and rear bushes press-fitted into a bush press-fit hole of the inner plate, a pair of front and rear connection pins loosely fitted to the bush, A pin press-fitting hole for press-fitting the connecting pin is formed to provide lubrication in a gap between a pair of left and right outer plates that connect the inner plate in the longitudinal direction of the chain, the inner surface of the outer plate, and the outer surface of the inner plate. A seal chain configured to prevent leakage of the agent or intrusion of external dust, wherein the seal mechanism is formed in a ring holding groove that is concentrically recessed about the connecting pin on the inner side surface of the outer plate. An outer ring portion that is press-fitted and stands toward the outer surface of the inner plate, and swells in a non-contact state along the outer surface of the inner plate from the inner peripheral surface of the outer ring portion. A steel outer periphery side seal receiving member that is formed and has an outer peripheral side disk portion that is close to the bush, and a bush protruding end portion of the bush that partially protrudes from the outer surface of the inner plate is fitted and fixed. The inner ring portion interposed in the gap between the outer peripheral seal receiving member and the bush protruding end portion, and the outer peripheral surface of the inner ring portion is bulged in a non-contact state along the inner surface of the outer plate. A steel inner peripheral seal receiving member provided with an inner peripheral disk portion close to the outer peripheral ring portion, and disposed in a gap between the outer peripheral seal receiving member and the inner peripheral seal receiving member. The above-described problem is solved by the elastic seal member that seals the gap between the outer surface of the outer peripheral disk portion and the inner surface of the inner disk portion.

  According to a second aspect of the present invention, in addition to the configuration according to the first aspect, the elastic seal member is disposed in contact with an outer surface of the outer peripheral disk portion so that the outer peripheral disk portion and the inner peripheral surface are in contact with each other. A seal disc portion interposed in a gap with the side disc portion, and a plurality of seal lip portions swelled from the outer side surface of the seal disc portion and slidably abutting on the inner side surface of the inner circumference side disc portion, respectively. By providing, it solves the problem mentioned above.

  In addition to the structure of claim 2, the present invention according to claim 3 is described above because the seal lip portion is reduced in diameter from the outer peripheral disk portion side toward the inner peripheral disk portion side. It solves the problem further.

  According to a fourth aspect of the present invention, in addition to the configuration according to any one of the first to third aspects, an outer surface of the inner peripheral side seal receiving member is provided flush with an end surface of the bushing protruding end portion. Thus, the above-described problems are further solved.

  According to a fifth aspect of the present invention, in addition to the structure according to any one of the first to fourth aspects, the inner circumferential side seal receiving member is integrally formed at the tip of the inner circumferential side ring portion. By providing a positioning lip portion for positioning the press-fitting position of the inner peripheral side seal receiving member with respect to the bush protruding end portion, the above-described problem is further solved.

  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 connecting pin has a positioning reduced diameter step portion for positioning the press-fitting position of the outer plate with respect to the connecting pin. Thus, the above-described problems are further solved.

  Therefore, the present invention press-fits a pair of left and right inner plates spaced apart from each other, a pair of front and rear bushes press-fitted into the bush press-fit holes of the inner plate, and a pair of front and rear connection pins and a connection pin loosely fitted to the bushes. A pair of left and right outer plates that connect the inner plate in the longitudinal direction of the chain by forming a pin press-fitting hole, and a gap between the inner side surface of the outer plate and the outer side surface of the inner plate are provided for leakage of lubricant or external dust. By being configured with a seal mechanism that prevents intrusion, not only can the lubricant leak due to centrifugal force, etc. caused by circular running during chain operation, but also smooth chain drive can be realized. The following unique effects can be obtained.

  According to the seal chain of the present invention according to claim 1, the seal mechanism is press-fitted into the outer surface of the inner plate by being press-fitted into the ring holding groove concentrically formed around the connecting pin on the inner surface of the outer plate. An outer ring portion that stands up toward the outer periphery, and an outer disk portion that bulges in a non-contact state from the inner peripheral surface of the outer ring portion toward the outer surface of the inner plate and is close to the bush. An outer circumference side seal receiving member made of steel and an inner circumference that is fitted and fixed to the bush protruding end portion of the bush partially protruding from the outer surface of the inner plate, and is interposed in the gap between the outer circumferential side seal receiving member and the bush protruding end portion. A steel having a side ring portion and an inner circumferential side disk portion that bulges in a non-contact state along the inner side surface of the outer plate from the outer circumferential surface of the inner circumferential side ring portion and is close to the outer circumferential side ring portion The inner peripheral side made of And an elastic seal member that is disposed in the gap between the outer peripheral side seal receiving member and the inner peripheral side seal receiving member and seals the gap between the outer side surface of the outer peripheral side disc portion and the inner side surface of the inner peripheral side disc portion, Since the elastic seal member seals the gap between the outer peripheral side seal receiving member and the inner peripheral side seal receiving member, lubrication is interposed in the gap between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin. The agent is prevented from leaking outside from the gap between the inner side surface of the outer plate and the outer side surface of the inner plate, and the entry of external dust is surely prevented, so that chain wear elongation can be prevented over a long period of time.

  In addition, even when a lubricant leakage path occurs between the inner surface of the outer plate and the outer surface of the inner plate due to wear damage of the elastic seal member, etc., the outer plate, the inner plate, and the outer peripheral seal holder The labyrinth structure in which the leakage path of the lubricant formed between the member and the inner circumference side seal receiving member is bent in a complicated manner is exhibited, and external leakage of the lubricant due to the centrifugal force generated by the circular running during the chain operation is prevented. Since it suppresses and the penetration | invasion of external dust is suppressed, the sealing performance by a sealing mechanism can be maintained over a long term.

  In addition, the outer peripheral ring portion formed on the outer peripheral side seal receiving member is located on the outermost peripheral side of the seal mechanism and covers the outer peripheral surface side of the elastic seal member, and the outer peripheral side formed on the outer peripheral side seal receiving member In order to avoid foreign matter such as iron ore, coal, gravel, etc. from directly hitting the elastic seal member by the disk portion being in contact with and covering the inner surface of the elastic seal member, damage to the elastic seal member, etc. Can be prevented.

  Further, the outer peripheral side seal receiving member is attached to the outer plate by fitting the outer peripheral ring portion to a ring holding groove formed on the outer plate, so that the outer peripheral side seal receiving member is placed over the entire area where the seal mechanism is installed. Unlike conventional seal chains in which concave grooves are formed in the link plate, a pin that is susceptible to stress when driving the chain is formed by forming a ring retaining groove on the inner surface of the outer plate on the outermost side of the seal mechanism installation area. Since it is possible to form the outer peripheral ring portion while avoiding the vicinity region, it is possible to suppress a decrease in strength of the outer plate due to the formation of the outer peripheral ring portion.

  Further, when the chain is driven, the elastic seal member is in sliding contact with only the outer side surface of the outer peripheral side seal receiving member or the inner side surface of the inner peripheral side seal receiving member. The surface roughness of the inner side surface of the member may be reduced, and the sliding wear of the elastic seal member can be suppressed without the need for surface finishing on the inner side surface of the outer plate or the outer side surface of the inner plate.

  According to the seal chain of the present invention according to claim 2, in addition to the effect exhibited by the seal chain according to claim 1, the elastic seal member is disposed in contact with the outer surface of the outer peripheral disk portion and has an outer periphery. A plurality of seals that are formed to swell from the outer surface of the seal disk part and the seal disk part interposed in the gap between the side disk part and the inner disk part and are in sliding contact with the inner surface of the inner disk part By providing a lip portion, it is formed in the elastic seal member even when the inner link consisting of the inner plate and bushing is unevenly distributed in the chain width direction with respect to the outer link consisting of the outer plate and connecting pin when the chain is driven The seal lip portion is elastically deformed and securely contacts the inner surface of the seal disc portion formed on the inner periphery side seal receiving member. The gap between the disk portion and the inner peripheral side disc portion can be reliably sealed.

  In addition, since a plurality of seal lip portions are provided, the plurality of seal lip portions seals the gap between the outer peripheral disk portion and the inner peripheral disk portion in multiple layers, so that the sealing performance by the elastic seal member can be improved. This narrowing also occurs when a narrow pressure is applied to the elastic seal member from the outer disk part and the inner disk part due to the uneven distribution of the inner plate in the chain width direction with respect to the outer link when the chain is driven. Since the pressure is distributed and received by the plurality of seal lip portions, the durability of the elastic seal member can be greatly improved.

  According to the seal chain of the present invention according to claim 3, in addition to the effect produced by the seal chain according to claim 2, the seal lip portion is reduced in diameter from the outer peripheral disc portion side toward the inner peripheral disc portion side. By doing so, the direction of the seal lip portion has a reverse shape with respect to the intrusion direction of iron ore, coal, gravel, external dust, etc. outside the chain in the gap between the outer peripheral disc portion and the inner peripheral disc portion. Therefore, it is possible to improve the function of preventing intrusion of iron ore, coal, gravel, external dust and the like having a large particle size and weight as compared with the lubricant interposed in the gap between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin.

  According to the seal chain of the present invention according to claim 4, in addition to the effect produced by the seal chain according to any one of claims 1 to 3, the outer surface of the inner circumferential side seal receiving member is a bush protruding end portion. The sliding wear of the inner peripheral side seal receiving member is avoided in order to prevent only the inner peripheral side seal receiving member from sliding with the inner side surface of the outer plate when the chain is driven. Can be suppressed.

  According to the seal chain of the present invention according to claim 5, in addition to the effect exhibited by the seal chain according to any one of claims 1 to 4, the inner peripheral side seal receiving member is provided on the inner peripheral side ring portion. By providing a positioning lip portion integrally formed at the tip, the positioning lip portion formed on the inner peripheral side seal receiving member is fitted to the inner plate when the inner peripheral side seal receiving member is press-fitted into the bush protruding end portion. An inner peripheral disk formed on the inner peripheral seal receiving member without positioning an excessive work load to position the press-fitting position of the inner peripheral seal receiving member with respect to the bush protruding end portion by contacting the outer side surface The outer surface of the portion can be set flush with the end surface of the bushing protruding end portion.

  According to the seal chain of the present invention according to claim 6, in addition to the effect exerted by the seal chain according to any one of claims 1 to 5, the connecting pin has a positioning reduced diameter step portion. Thus, when the outer plate is press-fitted to the connecting pin, the inner surface of the outer plate abuts against the positioning reduced diameter step portion formed on the connecting pin to position the outer plate press-fitting position with respect to the connecting pin. The distance between the outer side surface and the inner side surface of the outer plate is accurately adjusted, and the elastic seal member is excessively pinched between the outer peripheral side seal receiving member and the inner peripheral side seal receiving member to cause damage. The sealing performance by the sealing mechanism can be surely exhibited such as avoidance.

BRIEF DESCRIPTION OF THE DRAWINGS The whole schematic diagram which shows the seal chain which is one Example of this invention. The top view which looked at the seal chain from the side. The perspective view which notched some seal chains. Sectional drawing which shows a seal chain. Sectional drawing which shows the principal part of a seal chain.

  The present invention press-fits a pair of left and right inner plates, a pair of front and rear bushes press-fitted into a bush press-fitting hole of the inner plate, and a pair of front and rear connection pins loosely fitted to the bush and a connection pin. A pin press-fit hole is formed to connect the inner plate in the longitudinal direction of the chain, and is provided in the gap between the left and right outer plates and the inner surface of the outer plate and the outer surface of the inner plate to prevent leakage of lubricant or intrusion of external dust. In a seal chain configured with a blocking seal mechanism, the seal mechanism is press-fitted into a ring holding groove concentrically formed around the connecting pin on the inner side surface of the outer plate and Peripheral ring part standing toward the side surface and outer periphery that bulges in a non-contact state along the outer surface of the inner plate from the inner peripheral surface of the outer ring part and is close to the bush An outer peripheral seal receiving member made of steel having a disk portion, and an outer peripheral seal receiving member and a bush protruding end portion, which are fitted and fixed to the bush protruding end portion of the bush partially protruding from the outer surface of the inner plate. Inner circumferential side ring portion interposed in the gap, and an inner circumferential side disk that bulges in a non-contact state from the outer circumferential surface of the inner circumferential side ring portion toward the inner side surface of the outer plate and is close to the outer circumferential side ring portion An inner peripheral seal receiving member made of steel and a gap between the outer peripheral seal receiving member and the inner peripheral seal receiving member, the outer surface of the outer peripheral disk portion and the inner peripheral disk portion It is composed of an elastic seal member that seals the gap with the side surface, avoids damage to the elastic seal member, exhibits excellent sealing performance and seal life for a long time, and causes wear damage to the elastic seal member. As long as the seal performance is maintained and the strength reduction of the outer plate is suppressed, and the iron ore having a large particle size and weight, coal, gravel, external dust, etc. can be prevented from entering, Any specific embodiment may be used.

  For example, the seal chain of the present invention may be either a roller chain or a bush chain.

  The specific material of the elastic seal member incorporated in the seal chain of the present invention may be any of fluororesin, nylon resin, polyurethane, etc. as long as it has sliding characteristics, wear resistance, and shape stability. In particular, when a fluororesin is used, the fluororesin itself exhibits its excellent sliding characteristics and durability, and the outer periphery side seal receiving member or the inner periphery side seal receiving member when the chain is bent. This is more preferable because the sliding resistance between the two is reduced.

  Moreover, as for the specific materials of the outer peripheral side seal receiving member and the inner peripheral side seal receiving member incorporated in the seal chain of the present invention, aluminum, steel, as long as it has impact resistance, wear resistance, and corrosion resistance, Any of stainless steel, chrome molybdenum steel, etc. may be used. Particularly, when stainless steel is used, the outer side surface of the outer peripheral disk portion formed on the outer peripheral seal receiving member exhibits excellent corrosion resistance. In order to maintain the surface roughness of the inner side surface of the inner peripheral side disk portion formed on the inner peripheral side seal receiving member over a long period of time, it is caused by sliding contact with these outer peripheral side disc portion or inner peripheral side disc portion. This is more preferable because it prevents sliding contact of the elastic seal member, and when these materials are subjected to nitriding treatment, the strength is improved and the friction coefficient is reduced. Since achieving smooth chain bending suppresses the sliding wear of the other components, and more preferred.

  In addition, the specific type of lubricant used in the seal chain of the present invention may be any of lubricating oil, grease, graphite and the like as long as it has excellent lubricity, and lubricates as a lubricant. When oil is used, the lubricating oil not only lubricates between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin, and between the end surface of the bushing protruding end portion and the inner surface of the outer plate, but the lubricating oil is high. An inner peripheral disk portion formed on the outer surface of the outer peripheral disk portion formed on the outer peripheral side seal receiving member or the outer peripheral surface of the seal lip portion formed on the elastic seal member and the inner peripheral seal receiving member. Since it is supplied between the inner surface and the inner surface of the lip, the sliding performance of the seal lip can be reduced and the sealing performance can be maintained over a long period of time. Suppresses the deterioration of the lubricant caused by the inhalation of dust in the atmosphere and the long-term chain drive, and graphite exhibits excellent lubrication performance over a long period of time and also exhibits excellent heat resistance performance in a high temperature atmosphere .

Hereinafter, a seal chain 100 according to an embodiment of the present invention will be described with reference to the drawings.
Here, FIG. 1 is a partial cross-sectional view showing an overall outline of a seal chain according to an embodiment of the present invention, FIG. 2 is a plan view showing the seal chain as viewed from the side, and FIG. FIG. 4 is a perspective view showing an enlarged main part of the seal chain, FIG. 4 is a cross-sectional view showing the seal chain, and FIG. 5 is a cross-sectional view showing mainly a seal mechanism incorporated in the seal chain.

  First, a seal chain 100 according to an embodiment of the present invention is used as a bucket conveyor chain used in a continuous unloader for unloading iron ore and coal, and is shown in FIGS. 1 to 4. Thus, a pair of left and right inner plates 110 spaced apart, a pair of front and rear bushes 120 press-fitted into the bushing press-fitting holes of the inner plate 110, and a pair of front and rear rollers 130 externally fitted to the bush 120 A pair of front and rear connecting pins 140 loosely fitted to the bush 120, and a pair of left and right outer plates 150 that connect the inner plate 110 in the longitudinal direction of the chain by forming pin press-fitting holes for press-fitting the connecting pins 140 respectively. , Lubricating oil as a lubricant interposed in the gap between the outer peripheral surface of the connecting pin 140 and the inner peripheral surface of the bush 120, and the inner surface of the outer plate 150 It is composed of a sealing mechanism 160 for preventing external leakage of lubricating oil provided in the gap between the outer surface of the inner plate 110.

  Therefore, a specific form of the seal mechanism 160 that is most characteristic of the seal chain 100 of the present embodiment will be described in detail with reference to FIGS.

  First, as shown in FIGS. 3 to 5, the seal mechanism 160 is press-fitted into a ring holding groove 151 concentrically formed on the inner side surface of the outer plate 150 with the connecting pin 140 as the center, and is fitted into the inner plate 110. The outer ring side 161a that stands up toward the outer surface and the outer ring that bulges in a non-contact state along the outer surface of the inner plate 110 from the inner peripheral surface of the outer ring part 161a and is close to the bush 120 An outer peripheral side seal receiving member 161 made of nitriding stainless steel (SUS304), and a bush protruding end portion 121 of the bush 120 partially protruding from the outer surface of the inner plate 110. An inner ring portion 162a and an inner ring portion that are fitted and fixed and are interposed in the gap between the outer peripheral seal receiving member 161 and the bush protruding end portion 121. A nitriding treatment was performed with an inner peripheral disk portion 162b that bulges out in a non-contact state along the inner surface of the outer plate 150 from the outer peripheral surface of 162a and is close to the outer ring portion 161a. An inner peripheral seal receiving member 162 made of stainless steel (SUS304) and an outer surface of the outer peripheral disk portion 161b are disposed in contact with each other, and are interposed in a gap between the outer peripheral disk portion 161b and the inner peripheral disk portion 162b. An elastic made of a fluororesin is provided with a seal disc portion 163a and a plurality of seal lip portions 163b swelled from the outer surface of the seal disc portion 163a and slidably contacting the inner surface of the inner peripheral disc portion 162b. And a sealing member 163.

As described above, the elastic seal member 163 is installed in the gap between the outer peripheral side seal receiving member 161 and the inner peripheral side seal receiving member 162, thereby sealing the gap between the outer peripheral side seal receiving member 161 and the inner peripheral side seal receiving member 162. Thus, the lubricating oil interposed in the gap between the inner peripheral surface of the bush 120 and the outer peripheral surface of the connecting pin 140 is prevented from leaking out from the gap between the inner side surface of the outer plate 150 and the outer side surface of the inner plate 110. Thus, smooth chain drive over a long period of time without oiling is realized.
Further, when regular oiling maintenance is performed between the inner peripheral surface of the bush 120 and the outer peripheral surface of the connecting pin 140, a bush protruding end portion is provided between the inner peripheral surface of the bush 120 and the outer peripheral surface of the connecting pin 140. In order to maintain the lubrication state between the end surface of 121 and the inner side surface of the outer plate 150 and between the outer peripheral side seal receiving member 161 or the inner peripheral side seal receiving member 162 and the elastic seal member 163 for a longer period, preferable.

  Further, as shown in FIGS. 3 to 5, the seal lip portion 163b is arranged in a circular shape centering on the connecting pin 140, and is directed from the outer peripheral side disk portion 161b side toward the inner peripheral side disc portion 162b side. The diameter is reduced.

  As shown in FIGS. 3 to 5, the outer surface of the inner circumferential side seal receiving member 162 is flush with the end surface of the bushing protruding end portion 121.

  Further, as shown in FIGS. 3 to 5, the inner circumferential side seal receiving member 162 is integrally formed at the tip of the inner circumferential side ring portion 162a and the press-fitting position of the inner circumferential side seal receiving member 162 with respect to the bush protruding end portion 121. The inner peripheral side seal receiving member 162 is formed by drawing, and the processing load is compared with the case where the inner peripheral side seal receiving member 162 is formed by cutting. Is to be reduced.

  Further, as shown in FIG. 4, the connecting pin 140 has a positioning diameter-reducing step portion 141 that positions the press-fit position of the outer plate 150 with respect to the connecting pin 140.

The seal chain 100 of the present embodiment obtained in this way includes a steel outer peripheral side seal receiving member 161 having an outer peripheral side ring portion 161a and an outer peripheral side disc portion 161b, and an inner peripheral side. A steel inner peripheral seal receiving member 162 having a ring portion 162a and an inner peripheral disc portion 162b, and an elastic seal member disposed in a gap between the outer peripheral seal receiving member 161 and the inner peripheral seal receiving member 162. 163.
Therefore, the elastic seal member 163 seals the gap between the outer peripheral side seal receiving member 161 and the inner peripheral side seal receiving member 162, and the lubricating oil interposed in the gap between the inner peripheral surface of the bush 120 and the outer peripheral surface of the connecting pin 140. Prevents external leakage from the gap between the inner surface of the outer plate 150 and the outer surface of the inner plate 110, and reliably prevents the intrusion of external dust, so that chain wear elongation can be prevented over a long period of time.

  Further, even when a lubricating oil leakage path occurs between the inner surface of the outer plate 150 and the outer surface of the inner plate 110 due to wear damage of the elastic seal member 163 or the like, the outer plate 150 and the inner plate 110. And a labyrinth structure in which the leakage path of the lubricating oil formed between the outer peripheral side seal receiving member 161 and the inner peripheral side seal receiving member 162 is bent in a complicated manner, and is caused by centrifugal force generated by the circular running during the chain operation, etc. In order to suppress the external leakage of the lubricating oil and to prevent the entry of external dust, the sealing performance by the sealing mechanism 160 can be maintained over a long period of time.

  Further, the outer peripheral ring portion 161 a formed on the outer peripheral seal receiving member 161 is located on the outermost peripheral side of the seal mechanism 160 and covers the outer peripheral surface side of the elastic seal member 163, and the outer peripheral seal receiving member 161 has The formed outer peripheral disk portion 161b is in contact with and covers the inner surface of the elastic seal member 163, thereby avoiding that foreign matters such as iron ore, coal, and gravel directly hit the elastic seal member 163. Therefore, damage to the elastic seal member 163 can be prevented.

  Further, the outer peripheral side seal receiving member 161 is attached to the outer plate 150 by fitting the outer peripheral side ring portion 161a into the ring holding groove 151 formed in the outer plate 150, so that the installation area of the seal mechanism can be reduced. Unlike a conventional seal chain in which a concave groove is formed in the outer link plate over the entire area, the ring holding groove 151 is formed on the inner surface of the outer plate 150 on the outermost peripheral side of the installation area of the seal mechanism 160. Since it is possible to form the outer peripheral ring portion 161a while avoiding a pin vicinity region where stress is easily applied during driving, it is possible to suppress a decrease in strength of the outer plate 150 due to the formation of the ring holding groove 151.

  Further, when the chain is driven, the elastic seal member 163 is in sliding contact with only the outer side surface of the outer peripheral side seal receiving member 161 or the inner side surface of the inner peripheral side seal receiving member 162. It is only necessary to reduce the surface roughness of the inner surface of the peripheral seal receiving member 162, and the sliding wear of the elastic seal member 163 is suppressed without the need for surface finishing on the inner surface of the outer plate 150 or the outer surface of the inner plate 110. it can.

In addition, the elastic seal member 163 is disposed in contact with the outer surface of the outer peripheral disk portion 161b and is interposed in the gap between the outer peripheral disk portion 161b and the inner peripheral disk portion 162b. A plurality of seal lip portions 163b are formed so as to bulge from the outer surface of 163a and abut against the inner surface of the inner peripheral disk portion 162b in a slidable manner.
Therefore, even when the inner link consisting of the inner plate 110 and the bush 120 is unevenly distributed in the chain width direction with respect to the outer link consisting of the outer plate 150 and the connecting pin 140 when the chain is driven, the elastic seal member 163 is formed. Since the seal lip portion 163b is elastically deformed and reliably contacts the inner surface of the seal disc portion 163a formed on the inner circumference side seal receiving member 162, the outer circumference side disc portion 161b and the inner circumference side disc portion 162b The gap can be reliably sealed.

A plurality of seal lip portions 163b are provided.
Accordingly, since the plurality of seal lip portions 163b seals the gap between the outer peripheral disk portion 161b and the inner peripheral disk portion 162b in a multiple manner, the sealing performance by the elastic seal member 163 can be improved, and the outer link when the chain is driven. Even when a narrow pressure is applied to the elastic seal member 163 from the outer peripheral disk portion 161b and the inner peripheral disk portion 162b due to the uneven distribution of the inner plate 110 in the chain width direction with respect to Since the seal lip portion 163b receives the dispersion, the durability of the elastic seal member 163 can be greatly improved.

Further, the seal lip portion 163b is reduced in diameter from the outer peripheral disc portion 161b side toward the inner peripheral disc portion 162b side.
Therefore, the direction of the seal lip portion 163b is opposite to the intrusion direction of iron ore, coal, gravel, external dust, etc. outside the chain in the gap between the outer peripheral disc portion 161b and the inner peripheral disc portion 162b. The function of preventing the intrusion of iron ore, coal, gravel, external dust and the like having a large particle size and weight can be improved.

Further, the outer surface of the inner peripheral seal receiving member 162 is provided flush with the end surface of the bush protruding end portion 121.
Therefore, since only the inner peripheral side seal receiving member 162 is prevented from sliding with the inner side surface of the outer plate 150 when the chain is driven, sliding wear of the inner peripheral side seal receiving member 162 can be suppressed.

Further, the inner peripheral side seal receiving member 162 includes a positioning lip portion 162c integrally formed at the tip of the inner peripheral side ring portion 162a.
Therefore, when the inner peripheral seal receiving member 162 is press-fitted into the bush protruding end portion 121, the positioning lip portion 162c formed on the inner peripheral seal receiving member 162 contacts the outer surface of the inner plate 110 and the bush protruding end. In order to position the press-fitting position of the inner peripheral side seal receiving member 162 with respect to the portion 121, the outer surface of the inner peripheral side disk portion 162b formed on the inner peripheral side seal receiving member 162 is not required without excessive work load. It can be set flush with the end face of the bushing protruding end portion 121.

Further, the connecting pin 140 has a positioning reduced diameter step portion 141.
Therefore, when the outer plate 150 is press-fitted into the connecting pin 140, the inner surface of the outer plate 150 abuts on the positioning reduced diameter step portion 141 formed on the connecting pin 140, and the press-fit position of the outer plate 150 with respect to the connecting pin 140 is changed. In order to position the elastic seal member 163, the outer peripheral side seal receiving member 161 and the inner peripheral side seal receiving member 162 adjust the mutual distance between the outer side surface of the inner plate 110 and the inner side surface of the outer plate 150 accurately. The effect is enormous, such as the ability to reliably exert the sealing performance by the seal mechanism 160, such as avoiding the occurrence of damage due to excessive pinching.

DESCRIPTION OF SYMBOLS 100 ... Seal chain 110 ... Inner plate 120 ... Bush 121 ... Bush protrusion end part 130 ... Roller 140 ... Connecting pin 141 ... Positioning diameter-reducing step part 150 ... Outer Plate 151 ... Ring holding groove 160 ... Seal mechanism 161 ... Outer peripheral side seal receiving member 161a ... Outer peripheral side ring part 161b ... Outer peripheral side disk part 162 ... Inner peripheral side seal receiving member 162a・ ・ ・ Inner peripheral ring portion 162b ・ ・ ・ Inner peripheral disc portion 162c ・ ・ ・ Positioning lip portion 163 ・ ・ ・ Elastic seal member 163a ・ ・ ・ Seal disc portion 163b ・ ・ ・ Seal lip portion

Claims (6)

A pair of left and right inner plates that are spaced apart, a pair of front and rear bushes that are press-fitted into the bushing press-fit holes of the inner plate, a pair of front and rear connection pins that are loosely fitted to the bushes, and a pin that press-fits the connection pins. It is provided in the gap between a pair of left and right outer plates that connect the inner plate in the longitudinal direction of the chain by forming a press-fitting hole, and the inner surface of the outer plate and the outer surface of the inner plate. In the seal chain composed of the sealing mechanism to prevent,
An outer peripheral ring portion that is press-fitted into a ring holding groove concentrically provided on the inner side surface of the outer plate with a connecting pin as a center, and stands on the outer side surface of the inner plate, and the outer periphery An outer peripheral side seal receiving member made of steel provided with an outer peripheral side disk portion that bulges in a non-contact state along the outer peripheral surface of the inner plate from the inner peripheral surface of the side ring portion and is close to the bush. An inner ring portion that is fitted and fixed to a bush protruding end portion of the bush that partially protrudes from the outer surface of the inner plate, and is interposed in a gap between the outer seal receiving member and the bush protruding end portion, and the inner periphery An inner peripheral side made of steel provided with an inner peripheral side disk portion that bulges out in a non-contact state along the inner surface of the outer plate from the outer peripheral surface of the side ring portion and is close to the outer peripheral side ring portion With seal receiving member An elastic seal member is disposed in the gap between the outer peripheral side seal receiving member and the inner peripheral side seal receiving member and seals the gap between the outer side surface of the outer peripheral side disc portion and the inner side surface of the inner peripheral side disc portion. A seal chain characterized by   The elastic seal member is disposed in contact with the outer surface of the outer peripheral disk portion and is disposed in the gap between the outer disk portion and the inner disk portion, and the outer surface of the seal disk portion. 2. A seal chain according to claim 1, further comprising a plurality of seal lip portions that are formed so as to swell and come into sliding contact with the inner surface of the inner peripheral disk portion.   3. The seal chain according to claim 2, wherein the seal lip portion is reduced in diameter from the outer peripheral disc portion side toward the inner peripheral disc portion side.   The seal chain according to any one of claims 1 to 3, wherein an outer side surface of the inner peripheral side seal receiving member is provided flush with an end surface of the bush protruding end portion.   The inner circumferential side seal receiving member is provided with a positioning lip portion that is integrally formed at the tip of the inner circumferential side ring portion and positions the press-fitting position of the inner circumferential side seal receiving member with respect to the bush protruding end portion. The seal chain according to any one of claims 1 to 4.   The seal chain according to any one of claims 1 to 5, wherein the connecting pin has a positioning reduced diameter step portion for positioning a press-fitting position of the outer plate with respect to the connecting pin.

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