JP5518008B2 - Conveyor chain - Google Patents

Description

  The present invention relates to a conveyor chain in which a lubricating oil is enclosed in a peripheral region of a plurality of rollers disposed between bushes and rollers, and particularly heavy objects such as coils and slabs in the field of iron making. It is related with the conveyor chain for carrying and carrying.

  Conventionally, as a conveyor chain for carrying and transporting heavy objects such as coils and slabs in the steelmaking field, lubricating oil is enclosed in a peripheral region of a plurality of rollers interposed between bushes and rollers. Conveyor chains are widely used.

  Such a conventional conveyor chain has a pair of left and right inner link plates spaced apart, bushes press-fitted into the bushing holes of these inner link plates, and an outer periphery of the bush that is rotatably fitted. A pair of left and right outer link plates that are press-fitted into both ends of the connection pin to connect the inner link plates to each other in the longitudinal direction of the chain, and the outer periphery of the bush A pair of left and right rollers disposed between the plurality of rollers interposed between the inner surface of the roller and the inner peripheral surface of the roller and the end surface of the inner link plate by press-fitting to the outer peripheral surface of the bush. An annular thrust bearing member is provided, and lubricating oil is sealed in a peripheral region of the roller (see, for example, Patent Document 1).

  Further, as shown in FIG. 9, another conventional conveyor chain 500 includes an annular thrust bearing member 570 disposed at both ends of a roller 530, and an outer peripheral surface of the inner circumferential surface 530 a of the roller 530 and the annular thrust bearing member 570. A groove having a semicircular cross section is formed on the surface 570a, and the groove of the roller 530 and the groove of the annular thrust bearing member 570 are vertically aligned to form a circular cross section. The seal ring 580 is disposed with substantially no gap (see, for example, Patent Document 2).

Japanese Patent No. 3719963 (Claims, FIG. 1) Japanese Patent No. 3563354 (Claims, FIG. 4)

  However, the conventional conveyor chain as described in the former Patent Document 1 has a gap between the bush and the annular thrust bearing member loosely fitted to the bush. There is a problem that the lubricating oil may leak out from the gap or dust may enter from the outside.

  Further, the conveyor chain 500 as described in the latter patent document 2 is formed so that the inner diameter of the seal ring 580 is smaller than the outer diameter of the annular thrust bearing member 570, so that the seal ring 580 is elastically expanded. There is a problem in that it is necessary to fit into the annular thrust bearing member 570 and the mounting load of the seal ring 580 becomes heavy.

  Further, when the diameter of the synthetic resin seal ring 580 is reduced due to an increase in temperature, a gap is generated between the inner peripheral surface 530a of the roller 530 and the outer peripheral surface 580a of the seal ring 580, so that the lubricating oil leaks out from the gap. There was a problem that there was a risk of doing.

  Since the gap between the roller 530 and the annular thrust bearing member 570 is formed on the lower side in the vertical direction, the seal ring 580 is slidably contacted in the groove of the roller 530 provided with almost no gap, and the inner circumference of the roller 530 When the seal ring 580 is worn and damaged with respect to the surface 530a, the lubricating oil oozes out from between the roller 530 and the annular thrust bearing member 570 without any interruption, so that there is a risk that the oil will run out early. There was a problem.

  The present invention solves the above-mentioned problems of the prior art, that is, the object of the present invention is to prevent external leakage of the lubricating oil supplied to the peripheral region of the roller by the annular seal member from the outside. Prevent foreign matter from entering the peripheral area of the roller, secure lubricating oil for a long period of time, and easily achieve the attachment of the annular seal member to the annular thrust bearing member and roll between the bushes, and It is to provide a conveyor chain that smoothly and efficiently achieves rolling between rollers.

  The invention according to claim 1 includes a pair of left and right inner link plates spaced apart, a bush press-fitted into a bush hole of the inner link plate, a roller loosely fitted on the outer periphery of the bush, A connecting pin inserted into the inner peripheral side of the bush, a pair of left and right outer link plates press-fitted to both ends of the connecting pin and connecting the inner link plates to each other in the longitudinal direction of the chain, the outer peripheral surface of the bush and the roller A pair of left and right annular thrust bearing members interposed between a plurality of rollers disposed between the inner peripheral surface and the end surface of the inner link plate by press-fitting to the outer peripheral surface of the bush. And an annular seal member that seals the lubricating oil in close contact with the outer peripheral surface of the annular thrust bearing member. An annular seal cover that is provided between the inner circumferential surface of the annular thrust bearing member and the outer circumferential surface of the annular thrust bearing member and is attached adjacent to the outer side in the chain width direction of the annular sealing member is press-fitted to the inner circumferential surface of the roller. The annular thrust bearing member is press-fitted into the outer peripheral surface of the bush at a clamping position that allows fine movement in the chain width direction of the roller, and the roller pinches the roller so that the roller can be finely moved in the chain width direction. And an inner peripheral flange portion that positions the annular seal member so as to be finely movable in the chain width direction, and when the roller moves in the chain width direction with respect to the bush, the inner peripheral flange portion is In contact with the end face, the rollers are pushed and moved in the same direction as the direction of movement of the rollers in the chain width direction. At this time, the annular seal member and the annular seal cover By moving the chain width direction to strike the bearing member, it is intended to solve the aforementioned problems.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect of the invention, the outer wall surface of the inner peripheral flange portion formed on the roller and the inner wall surface of the annular seal cover are the outer periphery of the annular seal member. By forming the annular groove forming portion that engages with the side portion, the above-described problems are solved.

  According to a third aspect of the invention, in addition to the configuration of the second aspect of the invention, the annular seal member is formed with an outer diameter smaller than the bottom diameter of the annular groove forming portion and larger than the inner diameter of the roller. Thus, the above-described problem is solved.

  According to a fourth aspect of the present invention, in addition to the configuration according to any one of the first to third aspects, the outer surface of the annular seal cover caulks the inner peripheral edge of the roller. By being engaged by the pawl, the above-described problems are solved.

  In the invention according to claim 5, in addition to the configuration of the invention according to any one of claims 1 to 4, the annular seal member is disposed to face the end face of the roller with a gap. Thus, the above-described problem is solved.

  According to a sixth aspect of the present invention, in addition to the configuration of the first aspect of the present invention, the annular seal member is formed of an annular body that is uniform and unbroken over the entire circumference. Therefore, the above-described problems are solved.

  According to a seventh aspect of the present invention, in addition to the configuration of the first aspect of the present invention, the bush supplies the lubricating oil in the connecting pin into the peripheral area of the roller. By providing the introduction hole, the above-described problem is solved.

  The conveyor chain according to the present invention includes a pair of left and right inner link plates, a bush press-fitted into a bush hole of the inner link plate, a roller and a bush rotatably fitted on the outer peripheral side of the bush. A pair of left and right outer link plates, a bushing outer peripheral surface, and a roller inner peripheral surface that are press-fitted and connected to both ends of the connecting pin inserted into the inner peripheral side and connect the inner link plate to each other in the chain longitudinal direction. A pair of left and right annular thrust bearing members interposed between the plurality of rollers disposed between and the end surface of the inner link plate by press-fitting to the outer peripheral surface of the bush, By enclosing the lubricating oil in the peripheral area of the roller, the roller peripheral area is filled with the lubricating oil, so that the roller can smoothly rotate through the plurality of rollers. Together, it is possible to obtain the specific effect on the following present invention.

  That is, according to the conveyor chain of the invention according to claim 1, the annular seal member that seals the lubricating oil in close contact with the outer circumferential surface of the annular thrust bearing member is the inner circumferential surface of the roller and the outer circumferential surface of the annular thrust bearing member. Since the inner diameter of the annular seal member is substantially the same as the outer diameter of the annular thrust bearing member, the annular seal member is inserted into the annular thrust bearing member. The annular seal member can be simply attached while avoiding the effort of elastically expanding the annular seal member.

  In addition, an annular seal cover that is attached adjacent to the outer side in the chain width direction of the annular seal member is press-fitted to the inner peripheral surface of the roller, so that the inner peripheral surface of the roller and the outer peripheral surface of the annular seal cover Even if the annular seal member is reduced in diameter due to a temperature rise and a gap is generated between the inner peripheral surface of the roller and the outer peripheral surface of the annular seal member, An adjacent annular seal cover can seal the lubricating oil that is about to leak out of the gap.

  An annular seal member that seals the lubricating oil in close contact with the outer peripheral surface of the annular thrust bearing member is provided between the inner peripheral surface of the roller and the outer peripheral surface of the annular thrust bearing member, and the chain width direction of the annular seal member An annular seal cover that is attached adjacent to the outer side of the roller is press-fitted to the inner peripheral surface of the roller, so that the annular seal member and the annular seal member do not wear and damage the outer peripheral surface of the annular thrust bearing member. The seal cover reliably closes the space between the inner peripheral surface of the roller and the outer peripheral surface of the annular thrust bearing member, so that external leakage of lubricating oil supplied into the peripheral region of the roller is suppressed and the periphery of the roller from the outside. Foreign matter can be prevented from entering the area, and even if the lubricating oil is about to ooze out, the inner peripheral surface of the annular seal member extends from the inner peripheral surface of the roller on the lower side in the vertical direction. In order to remain the lubricating oil over, can be held for a lubricating oil to the long-term.

  In addition, the annular thrust bearing member is press-fitted to the outer peripheral surface of the bush at a clamping position that allows fine movement of the roller in the chain width direction, and the roller clamps the roller in the chain width direction so that the roller can be finely moved, and the annular seal member is chained. When the roller moves in the chain width direction with respect to the bushing, the inner peripheral flange is in contact with the end face of the roller, and the roller is moved in the chain width direction. In this case, the annular seal member and the annular seal cover are moved in the chain width direction with respect to the annular thrust bearing member, whereby a pair of left and right inner peripheral flange portions and A pair of left and right annular thrust bearing members allow fine movement in the chain width direction of the roller without uneven distribution of the lubricating oil sealed in the peripheral area of the roller Order to arrive at the people, rolling between one another and bushing at, and it is possible to smoothly achieve the rolling between each other and where the roller.

  And according to the conveyor chain which is the invention which concerns on Claim 2, in addition to the effect which the conveyor chain of the invention which concerns on Claim 1 show | plays, the outer wall surface of the inner peripheral side flange part formed in the roller, and an annular seal cover By forming the annular groove forming portion that engages with the outer peripheral side portion of the annular seal member with the inner wall surface, the concave and convex engagement is performed between the outer peripheral surface portion of the annular seal member and the groove wall surface formed in the annular groove forming portion. Since it has a so-called labyrinth structure, it is possible to suppress external leakage of lubricating oil that tends to occur between the annular seal member and the roller, and the annular seal member is disposed in the annular groove forming portion. Even if the roller rotates in a state of being eccentric in the radial direction with respect to the bush during conveyance driving, it is relatively displaceable in the radial direction with respect to the cover. Lubricating oil that tends to occur between the annular thrust bearing member and the annular seal member while avoiding wear damage to the outer circumferential surface of the annular thrust bearing member without contact with the inner circumferential surface of the roller and receiving a load. External leakage can be suppressed.

  According to the conveyor chain of the invention of claim 3, in addition to the effect exhibited by the conveyor chain of the invention of claim 2, the annular seal member has an outer diameter smaller than the bottom diameter of the annular groove forming portion and larger than the inner diameter of the roller. As a result of the formation, the annular seal member is always engaged in the annular groove forming portion. Therefore, when the roller rotates in a radial direction with respect to the bush during conveyance driving, or the roller or roller is in the bushing. Even if it is a case where it rotates in a skew state, it can prevent that an annular seal member falls carelessly from an annular groove formation part.

  According to the conveyor chain of the invention according to claim 4, in addition to the effect exhibited by the conveyor chain according to any one of claims 1 to 3, the outer surface of the annular seal cover is the inner peripheral end of the roller. Even if the annular seal cover is about to move in the chain width direction with respect to the rollers, the engagement claw is moved by the annular seal cover by being engaged by the engagement claw with the edge crimped. Therefore, it is possible to reliably prevent the annular seal cover from falling off.

  According to the conveyor chain of the invention according to claim 5, in addition to the effect of the conveyor chain of the invention according to any one of claims 1 to 4, the annular seal member provides a gap with the end face of the roller. By being disposed oppositely, the lubricating oil stored in the oil storage region between the roller end surface and the annular seal member is supplied toward the roller end surface according to the amount of oil in the roller end surface. The contact resistance in the chain width direction between the roller end surface and the inner surface of the annular thrust bearing member, that is, the so-called thrust direction can be greatly reduced.

  According to the conveyor chain of the invention according to claim 6, in addition to the effect exhibited by the conveyor chain of the invention according to any one of claims 1 to 5, the annular seal member is uniform and cut across the entire circumference. The annular seal member blocks the lubricating oil passage over the entire outer periphery of the annular thrust bearing member, so that it is possible to reliably prevent external leakage of the lubricating oil and entry of foreign matter from the outside. can do.

  According to the conveyor chain of the invention according to claim 7, in addition to the effect of the conveyor chain of the invention according to any one of claims 1 to 6, the bush removes the lubricating oil in the connecting pin around the roller. By providing the oil introduction hole that supplies oil into the region, the lubricating oil retained in the connecting pin is supplied into the peripheral region of the roller through the oil introduction hole, so that it rolls between the bushes and In addition, the rolling between the roller and the bush can be maintained for a long time without the need for maintenance.

1 is an overall schematic diagram in which a conveyor chain according to an embodiment of the present invention is partially cut away. The top view of the conveyor chain shown in FIG. Sectional drawing of the conveyor chain shown in FIG. The side view of the conveyor chain shown in FIG. The principal part expanded sectional view seen from the XX line of the conveyor chain shown in FIG. The figure which shows the state in which the roller of FIG. 5 was unevenly distributed in the thrust direction. The principal part expanded sectional view seen from the YY line of the conveyor chain shown in FIG. The figure which shows the state in which the roller of FIG. 7 was unevenly distributed to the radial direction. Sectional drawing which shows the conventional conveyor chain.

  The present invention includes a pair of left and right inner link plates spaced apart, a bush press-fitted into a bush hole of the inner link plate, a roller loosely fitted on the outer periphery of the bush, and an inner periphery of the bush Between the outer peripheral surface of the bush and the inner peripheral surface of the roller, and a pair of left and right outer link plates that are press-fitted into both ends of the connecting pin and connect the inner link plates to each other in the longitudinal direction of the chain. A pair of left and right annular thrust bearing members that are press-fitted into the outer peripheral surface of the bushing and interposed between the inner surface and the end surface of the inner link plate. In a conveyor chain in which lubricating oil is sealed in a region, an annular seal member that seals the lubricating oil in close contact with the outer peripheral surface of the annular thrust bearing member is provided between the inner peripheral surface of the roller and the annular thrust bearing portion. An annular seal cover, which is provided between the outer circumferential surface of the annular seal member and is attached adjacent to the outer side in the chain width direction of the annular seal member, is press-fitted into the inner circumferential surface of the roller. Is provided with an inner peripheral flange portion that can be pinched so that the ring seal member can be finely moved in the chain width direction, and when the roller moves in the chain width direction with respect to the bush, the inner peripheral flange portion is The roller is pushed and moved in the same direction as the moving direction of the roller in the chain width direction. At this time, the annular seal member and the annular seal cover move in the chain width direction with respect to the annular thrust bearing member. As a result, the annular seal member prevents external leakage of the lubricating oil supplied to the peripheral area of the roller and prevents foreign matter from entering the peripheral area of the roller from the outside. Securing oil over a long period of time, and easily mounting the annular seal member on the annular thrust bearing member, rolling between the bushing and the roller, and smoothly rolling between the roller Any specific embodiment may be used as long as it does.

  That is, the specific cross-sectional shape of the annular seal member used in the conveyor chain of the present invention is in close contact with the outer peripheral surface of the annular thrust bearing member and between the inner peripheral surface of the roller and the outer peripheral surface of the annular thrust bearing member. As long as it is provided, it may have any of a circular cross section, an elliptical cross section, and a rectangular cross section. However, in the case of an annular seal member having a rectangular cross section, a roller that forms an annular groove forming portion Since the outer wall surface and the inner wall surface of the annular seal cover are brought into surface contact with each other, external leakage of the lubricating oil is further suppressed.

  Furthermore, the specific material of the annular seal member used in the conveyor chain of the present invention may be any material as long as it is in close contact with the outer peripheral surface of the annular thrust bearing member. When the annular seal member is made of an elastic body made of resin, the annular seal member exhibits self-lubricating properties. Therefore, the annular thrust bearing member and the annular seal member are prevented from being damaged by wear on the outer peripheral surface of the annular thrust bearing member. Prevent external leakage of lubricating oil that tends to occur between

  In addition, the specific form of the bush used in the conveyor chain of the present invention is any form as long as it has an outer peripheral part that press-fits the annular thrust bearing member and the inner link plate by rolling the rollers. There is no problem, either a uniform outer diameter in the chain width direction, or a small-diameter that press-fits an annular thrust bearing member by placing it on both sides of the large-diameter outer periphery where the rollers roll and this large-diameter outer periphery. In the latter case, the annular thrust bearing member can be positioned in the boundary area between the large-diameter outer peripheral portion and the small-diameter outer peripheral portion. Attaching accuracy can be achieved.

  In addition, the specific bush exhibiting a uniform outer diameter in the chain width direction described above may be a wound bush by vertical attachment, a bush by forging, or an oil-impregnated bush by molding.

  In addition, the specific form of the connecting pin used in the conveyor chain of the present invention is any form as long as it is inserted through the bush and press-fitted at both ends to the pair of left and right outer link plates. However, if the oil supply means for supplying the lubricating oil is built in, it is possible to continuously supply oil into the peripheral area of the roller, so that rolling between the bushes and In addition, the rolling between the rollers can be maintained for a long time without maintenance.

Hereinafter, a conveyor chain according to an embodiment of the present invention will be described with reference to the drawings.
Here, FIG. 1 is an overall schematic view in which the conveyor chain of the present invention is partially cut away, FIG. 2 is a plan view of the conveyor chain shown in FIG. 1, and FIG. 3 is a diagram of the conveyor chain shown in FIG. 4 is a side view of the conveyor chain shown in FIG. 2, FIG. 5 is an enlarged cross-sectional view of the main part seen from the XX line of the conveyor chain shown in FIG. 3, and FIG. 5 is a view showing a state in which the rollers in FIG. 5 are unevenly distributed in the thrust direction, FIG. 7 is an enlarged cross-sectional view of a main part seen from the YY line of the conveyor chain shown in FIG. 3, and FIG. It is a figure which shows the state in which the roller of this was unevenly distributed to the radial direction.

First, a conveyor chain 100 according to an embodiment of the present invention is particularly used for carrying and transporting heavy objects such as coils and slabs in the steelmaking field, as shown in FIGS. 1 to 3. The inner link plates 110, 110 that are spaced apart from each other on the left and right sides, the bushes 120 that are press-fitted into the bushing holes 112 of the inner link plates 110, and the bushes 120 are freely loosely fitted on the outer peripheral side. Roller 130, a connecting pin 140 inserted into the inner peripheral side of the bush 120, and a pair of left and right outer pins that are press-fitted to both ends of the connecting pin 140 to connect the inner link plate 110 to each other in the longitudinal direction of the chain. A plurality of rollers 16 disposed between the link plates 150 and 150, and the outer peripheral surface 120a of the bush 120 and the inner peripheral surface 130a of the roller 130. And a pair of left and right annular thrust bearing members 170, 170 that are press-fitted into the outer peripheral surface 120a of the bush 120 and interposed between the inner surface 110a of the inner link plate 110 and the end surface 160a of the 160. .
Further, the conveyor chain 100 encloses lubricating oil in the peripheral region R of the roller 160 described above.
The annular thrust bearing member 170 is formed using a material having low friction and excellent wear resistance, such as synthetic resin such as fluororesin and polyamide resin, oil-impregnated sintered metal, and ceramic.

As shown in FIGS. 2 and 3, the connecting pin 140 described above is formed with an oil reservoir 142 that stores lubricating oil therein, and one end of the oil reservoir 142 is closed by a lid 144. Lubricating oil is supplied from the oil reservoir 142 via the oil passage 146 between the inner peripheral surface of the bush 120 and the outer peripheral surface of the connecting pin 140.
Further, as shown in FIGS. 2 and 3, the bush 120 includes an oil introduction hole 122 for supplying the lubricating oil supplied from the connecting pin 140 into the peripheral space R of the roller 160 near the center in the longitudinal direction of the bush. Yes.
As a result, the lubricating oil retained in the connecting pin 140 is supplied into the peripheral region R where the plurality of rollers 160 are disposed via the oil introduction hole 122.

Next, specific modes of the annular seal member 180 and the annular seal cover 190, which are the most characteristic features of the conveyor chain according to an embodiment of the present invention, will be described in detail.
First, as shown in FIGS. 2 and 3, the annular seal member 180 that closes the outer circumferential surface 170 a of the annular thrust bearing member 170 and seals the lubricating oil has the inner circumferential surface 130 a of the roller 130 and the annular thrust bearing member 170. The outer peripheral surface 170a is provided.
Thus, the inner diameter of the annular seal member 180 is formed with substantially the same dimension as the outer diameter of the annular thrust bearing member 170.
In the present embodiment, the annular seal member 180 is an elastic body made of a synthetic resin. However, other materials may be used as long as the lubricating oil is sealed in the peripheral region R of the roller 160. I do not care.

  Further, the annular seal cover 190 attached adjacent to the outer side of the annular seal member 180 in the chain width direction is press-fitted to the inner peripheral surface 130a of the roller 130 as shown in FIGS.

  As a result, the space between the inner peripheral surface 130a of the roller 130 and the outer peripheral surface 190a of the annular seal cover 190 is closed, and the annular seal member 180 does not wear and damage the outer peripheral surface 170a of the annular thrust bearing member 170. In this case, the member 180 and the annular seal cover 190 reliably block the space between the inner peripheral surface 130a of the roller 130 and the outer peripheral surface 170a of the annular thrust bearing member 170, and further, the lubricating oil tends to exude to the outside. Also, the lubricating oil remains from the inner peripheral surface 130a of the roller 130 to the inner peripheral surface 180a of the annular seal member 180 on the lower side in the vertical direction.

  Further, as shown in FIG. 3, the annular thrust bearing member 170 is press-fitted and fitted to the outer peripheral surface 120a of the bush 120 at a clamping position that allows fine movement of the roller 160 in the chain width direction, and the roller 130 is shown in FIG. Thus, the roller 160 is sandwiched so as to be finely movable in the chain width direction, and the inner peripheral flange portion 132 is positioned so that the annular seal member 180 is positioned so as to be finely movable in the chain width direction.

  As a result, the pair of left and right inner flange portions 132 and 132 and the pair of left and right annular thrust bearing members 170 and 170 are sealed in the peripheral region R of the roller 160 while allowing the roller 160 to be finely moved in the chain width direction. It is designed to spread every corner without uneven distribution of lubricant.

Further, as shown in FIG. 5, the outer wall surface 132 a of the inner peripheral flange portion 132 and the inner wall surface 190 b of the annular seal cover 190 have a gap between the groove wall surface 130 b of the roller 130 and the outer peripheral surface 180 a of the annular seal cover 180. An annular groove forming portion D that engages with the outer peripheral side portion 180b of the annular seal member 180 is formed in a state where the clearance is left.
At this time, the roller 130 and the annular seal cover 190 can be displaced in the radial direction with the annular seal member 180 interposed therebetween.

  As a result, the outer peripheral surface portion 180b of the annular seal member 180 and the groove wall surface 130b formed at the bottom of the annular groove forming portion D have a so-called labyrinth structure, that is, a so-called labyrinth structure, and the annular seal member 180. The outer peripheral side portion 180b is relatively displaceable in the radial direction with respect to the roller 130 and the annular seal cover 190 in the annular groove forming portion D.

  Further, as shown in FIG. 5, the annular seal member 180 is formed with an outer diameter smaller than the bottom diameter of the annular groove forming portion D and larger than the inner diameter of the roller 130.

  Accordingly, even when the roller 130 is rotated in a state of being eccentric in the radial direction with respect to the bush 120 during conveyance driving, or even when the roller 130 or the roller 160 is rotated in a skewed state with respect to the bush 120, The seal member 180 is always engaged with the inside of the annular groove forming portion D to prevent the annular seal member 180 from being accidentally dropped.

  As shown in FIG. 5, the annular seal member 180 is disposed to face the end surface 160 a of the roller 160 with a gap.

  As a result, the lubricating oil stored in the oil storage region S between the end surface 160a of the roller 160 and the annular seal member 180 is supplied toward the end surface 160a of the roller 160 according to the amount of oil in the end surface 160a of the roller 160. Thus, the contact resistance in the thrust direction between the end surface 160a of the roller 160 and the inner side surface 170b of the annular thrust bearing member 170 is greatly reduced.

  Further, the annular seal member 180 is formed of an annular body that is uniform and unbroken throughout the entire circumference.

  Thereby, the annular seal member 180 blocks the passage of the lubricating oil over the entire outer periphery of the annular thrust bearing member 170, thereby reliably preventing the external leakage of the lubricating oil and the entry of foreign matter from the outside.

  As shown in FIG. 4, the outer surface 190 c of the annular seal cover 190 is engaged by four locking claws 134 that are crimped on the inner peripheral edge 130 c of the roller 130.

  Accordingly, even when the annular seal cover 190 is about to move relative to the roller 130 toward the outside in the chain width direction, the locking claw 134 restricts the movement of the annular seal cover 190 and The seal cover 190 is reliably prevented from falling off.

Next, the operation of moving the roller 130 in the thrust direction will be described in detail with reference to FIGS.
First, the roller 130 moves rightward in FIG. 6 by an external force acting in the direction of the arrow in FIG.
Next, the inner peripheral flange 132 of the roller 130 formed on the left side of FIG. 6 contacts the end surface 160a of the roller 160 on the left side of FIG. 6 to push the roller 160 rightward in FIG.
Thereafter, the end surface 160a of the roller 160 on the right side of FIG. 6 contacts the inner peripheral surface 170b of the annular thrust bearing member 170, and the movement of the roller 130 and the roller 160 in the thrust direction is completed.
During the series of operations, the annular seal member 180 sandwiched between the roller 130 and the annular seal cover 190 moves to the right in FIG. 6 according to the movement of the roller 130, and the inner peripheral surface 180 a of the annular seal member 180. Always maintains an unloaded slidable contact state, that is, a so-called zero-touch state, without being deformed with respect to the outer peripheral surface 170a of the annular thrust bearing member 170.
When an external force in the direction opposite to the arrow direction in FIG. 6 acts on the roller 130, the roller 130 and the roller 160 move symmetrically with the above series of operations.

Next, the operation of moving the roller 130 in the radial direction will be described in detail with reference to FIGS.
First, the roller 130 moves downward in FIG. 8 by an external force acting in the direction of the arrow in FIG.
At this time, the roller 130 and the annular seal cover 190 move in the downward direction in FIG. 8 while being eccentric with respect to the central axis of the annular thrust bearing member 170 with the annular seal member 180 interposed therebetween.
When the outer peripheral surface 160b of any one of the rollers 160 contacts the outer peripheral surface 120a of the bush 120 and the inner peripheral surface 130a of the roller 130, the movement of the roller 130 and the roller 160 in the radial direction is finished.
During the series of operations, the inner side surface 180c of the annular seal member 180 and the outer wall surface 132a of the inner peripheral flange portion 132 are in sliding contact with each other, and the outer surface 180d of the annular seal member 180 and the inner wall surface 190b of the annular seal cover 190 are brought into contact. And are in sliding contact.
In addition, when an external force in the direction opposite to the arrow direction in FIG. 8 acts on the roller 130, it moves symmetrically with the above series of operations.

  In the conveyor chain 100 of this embodiment obtained in this way, the annular seal member 180 that seals the lubricating oil in close contact with the outer circumferential surface 170a of the annular thrust bearing member 170 is formed with the inner circumferential surface 130a of the roller 130 and the annular thrust. By being provided between the outer peripheral surface 170a of the bearing member 170, the burden of elastically expanding the annular seal member 180 when the annular seal member 180 is fitted into the annular thrust bearing member 170 is avoided. 180 can be easily attached.

  Further, since the annular seal cover 190 to be attached adjacent to the outer side in the chain width direction of the annular seal member 180 is press-fitted to the inner peripheral surface 130a of the roller 130, the annular seal member 180 is contracted due to a temperature rise. Even when a gap is generated between the inner circumferential surface 130a of the roller 130 and the outer circumferential surface 180a of the annular seal member 180, the annular seal cover 190 disposed adjacent to the roller 130 is interposed through the gap. Lubricating oil to be externally leaked from between the inner peripheral surface 130 a of the roller 130 and the outer peripheral surface 180 a of the annular seal member 180 can be sealed. Further, the annular seal member 180 is placed in the peripheral region R of the roller 160. Lubricating oil can be prevented while preventing external leakage of the lubricated lubricating oil and preventing foreign matter from entering the peripheral region R of the roller 160 from the outside. It can be maintained for a long period of time.

  Further, the annular thrust bearing member 170 is press-fitted to the outer peripheral surface 120a of the bush 120 at a holding position where the roller 160 allows fine movement in the chain width direction, and the roller 130 holds the roller 160 so as to be finely movable in the chain width direction. In addition, the annular seal member 180 is provided with an inner peripheral flange portion 132 that positions the annular seal member 180 so as to be finely movable in the chain width direction, thereby rolling between the bushes 120 and 160 and between the rollers 130 and 160. Rolling can be achieved smoothly.

  The outer wall surface 132 a of the inner peripheral flange portion 132 formed on the roller 130 and the inner wall surface 190 b of the annular seal cover 190 form an annular groove forming portion D that engages with the outer peripheral portion 180 b of the annular seal member 180. As a result, it is possible to suppress the external leakage of the lubricating oil that tends to occur between the roller 130 and the annular seal member 180, and when the roller 130 rotates in an eccentric state in the radial direction with respect to the bush 120 during the conveyance drive. Even if the annular thrust bearing member 170 is in contact with the inner circumferential surface 130a of the roller 130 and is not subjected to a load, the annular thrust bearing member 170 and the annular sealing member are avoided while avoiding wear damage to the outer circumferential surface 170a of the annular thrust bearing member 170. The effect is enormous, for example, it is possible to suppress the external leakage of the lubricating oil that tends to occur between 180 and 180.

DESCRIPTION OF SYMBOLS 100 ... Conveyor chain 110 ... Inner link plate 110a ... Inner side surface 112 ... Bush hole 120 ... Bush 120a ... Outer peripheral surface 122 ... Oil introduction hole 130 ... Roller 130a ··· Inner peripheral surface 130b ··· Groove wall surface 130c ··· Inner peripheral edge portion 132 ··· Inner peripheral flange portion 132a · · · Outer wall surface 134 · · · Locking claw 140 · · · Connection pin 142 ··· Oil reservoir 144 ··· Lid 146 ··· Oil path 150 ··· Outer link plate 160 ··· Roller 160a ··· End surface 160b · · · Outer peripheral surface 170 ··· Round thrust bearing member 170a · .... Outer peripheral surface 170b ... Inner side surface 180 ... Annular seal member 180a ... Inner peripheral surface 180b ... Outer peripheral side portion 180c ... Inner side surface 180d ... Outer side surface 19・ ・ ・ Annular seal cover 190a ・ ・ ・ Outer peripheral surface 190b ・ ・ ・ Inner wall surface 190c ・ ・ ・ Outer surface D ・ ・ ・ Annular groove forming portion R ・ ・ ・ Peripheral region S ・ ・ ・ Oil storage region 500 ・ ・ ・ Conveyor Chain 510 ... Inner link plate 512 ... Bush hole 520 ... Bush 530 ... Roller 530a ... Inner peripheral surface 540 ... Connection pin 550 ... Outer link plate 560 ... Roller 560a ... End face 570 ... Thrust bearing plate 570a ... Outer peripheral face 580 ... Seal ring

Claims (7)

A pair of left and right inner link plates spaced apart, a bush press-fitted into a bush hole in the inner link plate, a roller loosely fitted on the outer periphery of the bush, and an inner periphery of the bush are inserted. And a pair of left and right outer link plates that are press-fitted and fitted to both ends of the connection pins to connect the inner link plates to each other in the longitudinal direction of the chain, and are interposed between the outer peripheral surface of the bush and the inner peripheral surface of the roller. A pair of left and right annular thrust bearing members interposed between the plurality of disposed rollers and the end surface of the inner surface of the inner link plate by press-fitting to the outer peripheral surface of the bush, In a conveyor chain that is filled with lubricating oil in the surrounding area,
An annular seal member for sealing lubricating oil in close contact with the outer peripheral surface of the annular thrust bearing member is provided between the inner peripheral surface of the roller and the outer peripheral surface of the annular thrust bearing member;
An annular seal cover that is attached adjacent to the outside in the chain width direction of the annular seal member is press-fitted to the inner peripheral surface of the roller,
The annular thrust bearing member is press-fitted to the outer peripheral surface of the bush at a clamping position that allows fine movement in the chain width direction of the roller,
The roller includes an inner peripheral flange portion for pinching the roller so as to be finely movable in the chain width direction and positioning the annular seal member so as to be finely movable in the chain width direction;
When the roller moves in the chain width direction with respect to the bush, the inner peripheral flange portion comes into contact with the end face of the roller and moves the roller by pushing it in the same direction as the roller moving direction in the chain width direction. In this case, the annular seal member and the annular seal cover are moved in the chain width direction with respect to the annular thrust bearing member.   The outer wall surface of the inner peripheral flange portion formed on the roller and the inner wall surface of the annular seal cover constitute an annular groove forming portion that engages with the outer peripheral portion of the annular seal member. The conveyor chain according to claim 1.   The conveyor chain according to claim 2, wherein the annular seal member is formed with an outer diameter smaller than a bottom diameter of the annular groove forming portion and larger than an inner diameter of the roller.   The conveyor according to any one of claims 1 to 3, wherein an outer surface of the annular seal cover is engaged by a locking claw that crimps an inner peripheral edge of the roller. chain.   The conveyor chain according to any one of claims 1 to 4, wherein the annular seal member is disposed to face the end surface of the roller with a gap therebetween.   The conveyor chain according to any one of claims 1 to 5, wherein the annular seal member is formed of an annular body that is uniform and unbroken over the entire circumference.   The conveyor chain according to any one of claims 1 to 6, wherein the bush includes an oil introduction hole for supplying lubricating oil in the connecting pin into a peripheral region of the roller.

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