JP5164923B2 - Long-life chain - Google Patents

Description

  The present invention relates to a long-life chain used for a conveyer chain, a transmission chain, and the like, and in particular, an inner portion formed by press-fitting both end portions of a pair of front and rear bushes into a bush press-fit hole of a pair of left and right inner plates. The link and the outer link formed by press-fitting and fitting both ends of a pair of front and rear connecting pins penetrating into the bushing into the pin press-fitting holes of the pair of left and right outer plates are alternately connected in the longitudinal direction of the chain. The present invention relates to a long-life chain in which lubricating oil is interposed between an inner peripheral surface and an outer peripheral surface of a connecting pin.

  Conventionally, there has been known a roller chain in which an outer link in which an outer plate is press-fitted into both ends of two pins and an inner link in which an inner plate is press-fitted into both ends of two bushes in which rollers are rotatably fitted are connected to each other. (For example, refer to Patent Document 1).

JP 2000-249198 A (Claims, FIG. 5)

  In the conventional roller chain as described above, the bush and the pin are caused by a narrow gap between the inner peripheral surface of the bush and the outer peripheral surface of the pin and between the inner surface of the outer plate and the outer surface of the inner plate. There is a problem that capillary action acts on the lubricating oil injected therebetween, and the lubricating oil leaks out from between the inner surface of the outer plate and the outer surface of the inner plate.

Further, as a means for preventing the external leakage of the lubricating oil due to such a capillary phenomenon, a seal member such as an O-ring is disposed between the outer surface of the inner plate and the inner surface of the outer plate, so It is generally known to prevent external leakage of lubricating oil from between the plates.
When such a seal member is employed, since the seal member is arranged in a pressed state, there is a problem that the relative bending resistance between the outer plate and the inner plate increases, and the sliding wear of the seal member occurs. In order to prevent surface roughness, it is necessary to apply surface finishing to reduce the surface roughness of the outer surface of the inner plate and the inner surface of the outer plate. Since the number of parts and the number of assembly steps are increased, there is a problem that the assemblability of the chain is deteriorated.

  Therefore, the present invention solves the conventional problem, that is, the object of the present invention is to suppress the external leakage of the lubricating oil due to capillary phenomenon without increasing the chain manufacturing burden, An object of the present invention is to provide a long-life chain that realizes smooth bending and sliding of the chain over a long period of time and avoids a decrease in strength of the outer plate and the inner plate.

  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. The outer links formed by press-fitting the portions into the pin press-fitting holes of the pair of left and right outer plates are alternately connected in the longitudinal direction of the chain, and lubricating oil is provided between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin. In the long-life chain interposed, the bushing protruding end holding the outer plate side annular recess recessed on the inner side surface of the outer plate surrounds the bushing protruding end partly protruding from the outer side surface of the inner plate. An inner plate side annular recess formed in the outer surface of the inner plate, and a leakage blocking gap region that suppresses capillary action acting on the lubricating oil by surrounding the bush protruding end holding region, Outside play The leakage blocking gap region is configured together with the outer plate-side annular recess and arranged opposite to the side annular recess, and the inner surface of the outer plate-side annular recess is between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin. It communicates with the leakage blocking gap region composed of the outer plate side annular recess and the inner plate side annular recess through the bushing projecting end portion, and between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin and The gap between the inner side surface of the outer plate-side annular recess and the bushing projecting end is provided narrower than the leakage blocking gap region composed of the outer plate-side annular recess and the inner plate-side annular recess, thereby achieving the above-described problem. It has been solved.

  According to a second aspect of the present invention, in addition to the configuration according to the first aspect, the outer plate-side annular concave portion is formed by embossing in which the inner side surface of the outer plate is recessed to bulge to the outer side surface in an offset state. By being formed, the above-described problems are further solved.

  According to a third aspect of the present invention, in addition to the configuration according to the first or second aspect, the inner plate-side annular concave portion bulges to the inner side surface in an offset state by recessing the outer surface of the inner plate. The above-described problems are further solved by being formed by embossing.

  The “leakage blocking air gap region” as referred to in the long-life chain of the present invention means a air gap region that is set wide enough to suppress the action on the lubricating oil.

  Further, the “offset state” in the long-life chain of the present invention means that the inner plate-side annular recess and the outer plate-side annular recess and the other plate portions are shifted in the plate thickness direction to form steps. Means state.

  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. The outer links that are press-fitted into the pin press-fitting holes of the outer plate are alternately connected in the longitudinal direction of the chain, and lubricating oil is interposed between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin. By connecting the both ends of the connecting pin to the pin press-fitting holes of the outer plate, the external leakage of the lubricating oil along the connecting pin from both ends of the connecting pin is prevented, and smooth chain drive is realized. In addition to being able to do so, the following unique effects can be achieved.

According to the long-life chain of the present invention according to claim 1, the outer plate-side annular concave portion provided in the inner surface of the outer plate surrounds the bush protruding end portion that partially protrudes from the outer surface of the inner plate. An inner plate-side annular structure that includes a protruding end holding area and a leakage blocking gap area that surrounds the bush protruding end holding area and suppresses capillary action acting on lubricating oil, and is recessed in the outer surface of the inner plate The recess is disposed opposite to the outer plate-side annular recess to form a leakage blocking gap region together with the outer plate-side annular recess, and the space between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin It communicates with the leakage blocking gap area consisting of the outer plate side annular recess and the inner plate side annular recess through the side surface and the bushing protruding end, and between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin. And outside The inner peripheral surface of the bush is formed between the inner side surface of the bush-side annular recess and the bushing projecting end by being narrower than the leakage blocking gap region formed by the outer plate-side annular recess and the inner plate-side annular recess. Lubricating oil retained by capillary action in the narrow gap between the outer peripheral surface of the connecting pin and between the inner surface of the annular recess on the outer plate side and the end surface of the bushing protruding end communicates with the outlet side of this narrow gap. In order to eliminate the permeation force due to capillary action in the leakage blocking gap area that spreads rapidly, the lubricant is physically blocked from leaking into the leakage blocking gap area of the annular recess on the outer plate and connected to the inner peripheral surface of the bush Lubricating oil can be reliably held between the outer peripheral surfaces of the pins.
As a result, wear damage on the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin can be reduced, and chain wear elongation can be prevented over a long period of time.

  Also, when the outer plate-side annular recess has a recess shape, an oleophobic or oil-repellent injecting agent that prevents external leakage of the lubricating oil is injected into the leakage blocking gap region of the outer plate-side annular recess. Since the outer plate-side annular recess reliably holds the oleophobic or oil-repellent injecting agent, the effect of preventing the external leakage of the lubricating oil by the leakage blocking gap region of the outer plate-side annular recess can be improved.

  In addition, because the bushing partially protrudes from the outer surface of the inner plate, even if the inner link is skewed, swung, or unevenly distributed in the chain width direction with respect to the outer link during chain operation The end surface of the bushing protruding end portion with a small area and the inner side surface of the outer plate-side annular recess are brought into contact with each other to completely prevent contact between the outer surface of the inner plate having a large sliding area and the inner surface of the outer plate. Therefore, smooth chain bending and sliding over a long period of time can be realized without subjecting the inner surface of the outer plate and the outer surface of the inner plate to surface finishing to reduce the surface roughness.

  Further, since the seal member arranged in the pressed state is not provided as a separate part between the outer plate and the inner plate, it can be smoothly bent and run around during chain operation, and an increase in the number of chain parts can be avoided.

  Further, in the case where a seal member is provided between the outer plate and the inner plate, in order to prevent sliding contact wear of the seal member and maintain the sealing performance of the lubricating oil, Although it is necessary to apply surface finishing to the outer surface of the inner plate to reduce the surface roughness, the long-life chain of the present invention does not require conventional surface finishing, reducing the manufacturing burden of the chain it can.

  Furthermore, this inner plate side annular recess functions as a leakage blocking gap region surrounding the bush protruding end holding region, and in order to block the capillary phenomenon acting on the lubricating oil together with the leakage blocking gap region in the outer plate side annular recess, Lubricating oil can be more reliably held between the bush and the connecting pin.

  In addition, since the inner plate side annular recess has a recess shape, even when an oleophobic or oil repellent injection agent that prevents external leakage of the lubricating oil is injected into the inner plate side annular recess, the inner plate side Since the annular recess reliably holds the oleophobic or oil-repellent injection agent, it is possible to improve the effect of preventing external leakage of the lubricating oil by the inner plate-side annular recess functioning as a leakage blocking gap region.

  According to the long-life chain of the present invention according to claim 2, in addition to the effect achieved by the long-life chain according to claim 1, the outer plate-side annular recess is recessed in the inner surface of the outer plate in an offset state. By being formed by embossing that bulges to the outer surface, the sectional modulus of the outer plate-side annular recess and the sectional modulus of the other plate portions are approximately the same, so that a decrease in strength of the outer plate can be suppressed.

  In addition, when performing the stamping of the outer plate, the outer plate is punched and the outer plate side ring is formed by simply using a mold that has a concave shape on the inner surface of the outer plate and bulges to the outer surface in an offset state. Since it is possible to perform the recess forming process at the same time, there is no need to perform machining such as grinding or milling to form the outer plate side annular recess separately from the outer plate punching process. Manufacturing burden can be reduced.

  According to the long-life chain of the present invention according to claim 3, in addition to the effect exhibited by the long-life chain according to claim 1 or 2, the inner plate-side annular recess causes the outer surface of the inner plate to be recessed. As a result of the embossing that bulges to the inner surface in an offset state, the section modulus of the inner plate-side annular recess and the section modulus of the other plate parts are comparable, reducing the strength of the inner plate. Can be suppressed.

  Further, the inner plate-side annular recess is formed by pressing the outer surface of the inner plate so as to bulge to the inner surface in an offset state, so that when the inner plate is subjected to press punching, The inner plate can be punched and the inner plate-side annular recess can be formed at the same time simply by using a mold that has a recessed outer surface and bulges to the inner surface in an offset state. Apart from the punching of the plate, there is no need to perform machining such as grinding or milling to form the inner plate-side annular concave portion on the inner plate, and the manufacturing burden of the chain can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS The whole schematic diagram which notched a part of long-life chain which is 1st Example of this invention. The perspective view which shows the connection state of the long-life chain shown in FIG. FIG. 2 is a cross-sectional view in which the long-life chain shown in FIG. 1 is partially enlarged. Sectional drawing which expanded partially the long-life chain which is 2nd Example of this invention. Sectional drawing which expanded partially the long-life chain which is 3rd Example of this invention.

  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 long-life chain in which outer links that are press-fitted into the pin press-fitting holes of the plate are alternately connected in the longitudinal direction of the chain, and lubricating oil is interposed between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin A bush protruding end holding region, wherein the outer plate-side annular recess recessed on the inner side surface of the outer plate surrounds the bush protruding end that partially protrudes from the outer surface of the inner plate, and a bush protruding end holding region The inner plate-side annular recess formed on the outer surface of the inner plate is opposed to the outer plate-side annular recess, and the outer plate-side annular recess is formed on the outer surface of the inner plate. Plate side A leakage blocking air gap region is formed together with the concave portion, and the outer plate side ring is formed between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin through the inner side surface of the outer plate side annular concave portion and the bush protruding end portion. It communicates with the leakage blocking gap region composed of the recess and the inner plate side annular recess, and between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin, and between the inner side surface of the outer plate side annular recess and the bush protruding end. The gap between the outer plate-side annular recess and the inner plate-side annular recess is narrower than the leakage-blocking gap area, preventing external leakage of lubricating oil due to capillary action without increasing the chain manufacturing burden. In addition, a specific embodiment of the present invention can be used as long as it realizes smooth bending and sliding of the chain over a long period of time and avoids a decrease in strength of the outer plate and the inner plate. May no even what made things.

  For example, the long-life chain of the present invention can be a roller chain or a bush chain. In order to prevent, it is more preferable.

  In the long-life chain of the present invention, the number of inner links arranged in parallel in the chain width direction may be either a single row or a double row such as two rows or three rows.

  In addition, the specific shapes of the outer plate-side annular recess and the inner plate-side annular recess in the long-life chain of the present invention may be either a circular concave groove or a regular polygonal concave groove.

Hereinafter, the long-life chain 100 which is 1st Example of this invention is demonstrated based on drawing.
Here, FIG. 1 is an overall schematic view showing a part of the long-life chain according to the first embodiment of the present invention by cutting out a part thereof, and FIG. 2 is a partial view of the connection state of the long-life chain shown in FIG. FIG. 3 is a cross-sectional view showing a partially enlarged view of the long-life chain shown in FIG. 1.

  First, as shown in FIGS. 1 to 3, the long-life chain 100 according to the first embodiment of the present invention press-fits both ends of a pair of front and rear bushes 130 into bush press-fit holes of a pair of left and right inner plates 110. The inner link 140 and the outer link 170 formed by press-fitting both ends of the pair of front and rear connecting pins 160 penetrating into the bush 130 into the pin press-fitting holes of the pair of left and right outer plates 150 in the longitudinal direction of the chain. The rollers 120 are externally fitted to the bush 130 described above.

  The lubricating oil is interposed between the outer peripheral surface of the connecting pin 160 and the inner peripheral surface of the bush 130.

Therefore, specific forms of the bush 130, the outer plate 150, and the inner plate 110, which are the most characteristic features of the long-life chain 100 of this embodiment, will be described in detail with reference to FIGS.
First, as shown in FIGS. 2 and 3, an outer plate-side annular recess 151 is formed on the inner side surface of the outer plate 150.

  Further, as shown in FIG. 3, the outer plate side annular recess 151 includes a bush protruding end holding region 151 a surrounding the bush protruding end 131 partially protruding from the outer surface of the inner plate 110, and a bush protruding end holding. It is comprised with the leakage interruption | blocking space | gap area | region 151b surrounding the outer peripheral side of the area | region 151a.

  Further, as shown in FIGS. 2 and 3, an inner plate side annular recess 111 is formed on the outer surface of the inner plate 110, which is recessed by being countersunk in a diameter-enlarged state coaxial with the bush press-fitting hole. The inner plate side annular recess 111 is disposed opposite to the outer plate side annular recess 151 formed in the outer plate 150.

  Further, as shown in FIG. 3, the inner plate-side annular recess 111 formed in the inner plate 110 functions as a leakage blocking gap region 111b that surrounds the outer peripheral side of the bushing protruding end holding region 151a.

  The leakage blocking gap region 151b and the leakage blocking gap region 111b described above are provided between the inner peripheral surface of the bush 130 and the outer peripheral surface of the connecting pin 160, the inner side surface of the outer plate-side annular recess 151, and the end surface of the bush protruding end portion 131. It is set so as to suppress the capillary phenomenon that tends to occur due to the narrow gap between them.

  Also, as shown in FIG. 3, the bush 130 partially protrudes from the outer surface of the inner plate 110, and the inner link 140 is skewed, swung in the chain width direction with respect to the outer link 170 during chain operation, or Even in the case of uneven distribution, the end surface of the bushing protruding end portion 131 and the inner side surface of the outer plate-side annular recess 151 are brought into contact with each other so that the outer surface of the inner plate 110 and the inner side surface of the outer plate 150 are brought into contact with each other. Designed to prevent.

  In addition, an oleophobic or oil-repellent injecting agent that prevents external leakage of the lubricating oil is injected into the leakage blocking gap region 151b of the outer plate-side annular recess 151 and the inner plate-side annular recess 111 described above.

The long-life chain 100 of this embodiment obtained in this way has a bush protruding end in which an outer plate side annular recess 151 that is recessed on the inner surface of the outer plate 150 partially protrudes from the outer surface of the inner plate 110. The bushing protruding end holding region 151a surrounding the portion 131 and the leakage blocking gap region 151b surrounding the bushing protruding end holding region 151a are configured.
Therefore, it was retained by capillary action in a narrow gap between the inner peripheral surface of the bush 130 and the outer peripheral surface of the connecting pin 160 and between the inner side surface of the outer plate-side annular recess 151 and the end surface of the bush protruding end portion 131. Since the lubricating oil disappears in the leakage blocking gap region 151b communicating with the outlet side of the narrow gap and spreads rapidly by the capillary phenomenon in the leakage blocking gap region 151b, the lubricating oil is supplied to the leakage blocking gap region 151b of the outer plate side annular recess 151. Leakage is physically prevented, and the lubricating oil can be reliably held between the inner peripheral surface of the bush 130 and the outer peripheral surface of the connecting pin 160.
As a result, wear damage on the inner peripheral surface of the bush 130 and the outer peripheral surface of the connecting pin 160 can be reduced, and chain wear elongation can be prevented over a long period of time.

Further, the outer plate-side annular recess 151 has a recess shape.
Therefore, even when an oleophobic or oil-repellent injecting agent that prevents external leakage of the lubricating oil is injected into the leakage blocking gap region 151b of the outer plate-side annular recess 151, the outer plate-side annular recess 151 is made oleophobic or repellent. In order to reliably hold the oil-based injection agent, it is possible to improve the effect of preventing external leakage of the lubricating oil by the leakage blocking gap region 151b of the outer plate-side annular recess 151.

Further, the bush 130 partially protrudes from the outer surface of the inner plate 110.
Therefore, even when the inner link 140 is skewed, swung, or unevenly distributed in the chain width direction with respect to the outer link 170 when the chain is operating, the end surface of the bush protruding end portion 131 having a small sliding area and the outer plate side In order to prevent the contact between the outer surface of the inner plate 110 having a large sliding area and the inner surface of the outer plate 150 by bringing the inner surface of the annular recess 151 into contact with each other, the inner surface and the inner surface of the outer plate 150 are completely prevented. Smooth chain bending and sliding can be realized without subjecting the outer surface of the plate 110 to surface finishing to reduce the surface roughness.

  In addition, since a seal member arranged in a pressed state is not provided as a separate part between the outer plate 150 and the inner plate 110, it smoothly bends during the chain operation and travels around and avoids an increase in the number of chain parts. it can.

  Further, when a seal member is provided between the outer plate 150 and the inner plate 110, the outer plate 150 in contact with the seal member is kept in contact with the seal member in order to prevent sliding contact wear of the seal member and maintain the sealing performance of the lubricating oil. The inner surface and the outer surface of the inner plate 110 need to be surface-finished to reduce the surface roughness, but the long-life chain 100 of the present invention does not need to be surface-finished as in the prior art. Can reduce the manufacturing burden.

In addition, an inner plate-side annular recess 111 that is recessed on the outer surface of the inner plate 110 is disposed opposite to the outer plate-side annular recess 151.
Accordingly, the inner plate side annular recess 111 functions as a leakage blocking gap region 111b surrounding the bush protruding end holding region 151a, and the capillary phenomenon acts on the lubricating oil together with the leakage blocking gap region 151b in the outer plate side annular recess 151b. Therefore, the lubricating oil can be more reliably held between the bush 130 and the connecting pin 160.

And the inner plate side annular recessed part 111 is exhibiting the recessed part shape.
Therefore, even when an oleophobic or oil-repellent injecting agent that prevents external leakage of the lubricating oil is injected into the inner plate-side annular recess 111, the inner plate-side annular recess 111 ensures the oleophobic or oil-repellent injecting agent. Therefore, the effect of preventing the external leakage of the lubricating oil by the inner plate-side annular recess 111 functioning as the leakage blocking gap region 111b can be improved.

Next, a long-life chain 200 according to a second embodiment of the present invention will be described with reference to FIG.
Here, the configuration of the long-life chain 200 according to the second embodiment of the present invention other than the inner plate-side annular recess 211 and the outer plate-side annular recess 251 is exactly the same as the long-life chain 100 of the first embodiment described above. Therefore, the specification relating to the long-life chain 100 of the first embodiment and the reference numerals in the 100s shown in FIGS. 1 to 3 are replaced with the reference numerals in the 200s, so that the inner plate-side annular recess 211 and the outer plate-side annular The description of the configuration other than the recess 251 is omitted.

  Therefore, specific forms of the inner plate-side annular recess 211 and the outer plate-side annular recess 251 that are most characteristic of the long-life chain 200 of this embodiment will be described in detail with reference to FIG.

  First, as shown in FIG. 4, the outer plate-side annular recess 251 is formed by embossing in which the inner surface of the outer plate 250 is recessed in an expanded state coaxial with the pin press-fitting hole and bulges to the outer surface in an offset state. Has been.

  Further, as shown in FIG. 4, the inner plate-side annular recess 211 is formed by embossing in which the outer surface of the inner plate 210 is recessed in a diameter-enlarged state coaxial with the bushing press-fitting hole and bulges to the inner surface in an offset state. Has been.

  The “offset state” in the long-life chain 200 of the present invention means that the inner plate-side annular recess 211 and the outer plate-side annular recess 251 and the other plate portions are shifted in the plate thickness direction to form a stepped shape. It means the presenting state.

The long-life chain 200 of the present embodiment obtained in this way is formed by embossing in which the outer plate-side annular recess 251 dents the inner surface of the outer plate 250 and bulges to the outer surface in an offset state. Yes.
Therefore, since the section modulus of the outer plate-side annular recess 251 and the section modulus of the other plate portions are approximately the same, a decrease in strength of the outer plate 250 can be suppressed.

  Further, when the outer plate 250 is subjected to press punching, the outer plate 250 can be punched and removed only by using a mold having a shape in which the inner surface of the outer plate 250 is recessed and bulged to the outer surface in an offset state. Since the plate-side annular recess 251 can be formed at the same time, the outer plate 250 is subjected to mechanical processing such as grinding or milling to form the outer plate-side annular recess 251 separately from the punching process of the outer plate 250. There is no need to apply it, and the manufacturing burden of the chain can be reduced.

Further, the inner plate-side annular recess 211 is formed by embossing in which the outer surface of the inner plate 210 is recessed to bulge to the inner surface in an offset state.
Accordingly, the section modulus of the inner plate-side annular recess 211 and the section coefficients of the other plate portions are approximately the same, so that a decrease in strength of the inner plate 210 can be suppressed.

  In addition, when the inner plate 210 annular recess 211 is formed by press working to dent the outer surface of the inner plate 210 and bulge to the inner surface in an offset state, The punching process of the inner plate 210 and the forming process of the inner plate-side annular recess 211 can be performed simultaneously only by using a mold having a shape in which the outer surface of the inner plate 210 is recessed and bulged to the inner surface in an offset state. Since it is possible, it is not necessary to perform machining such as grinding or milling to form the inner plate side annular recess 211 separately from the punching processing of the inner plate 210, and the manufacturing burden of the chain can be reduced. The effect is enormous.

Next, a long-life chain 600 according to a third embodiment of the present invention will be described with reference to FIG.
Here, the configuration of the long-life chain 600 according to the third embodiment of the present invention other than the inner plate-side annular recess 611 and the outer plate-side annular recess 651 is exactly the same as the long-life chain 100 of the first embodiment described above. For this reason, the specification relating to the long-life chain 100 of the first embodiment and the reference numerals in the 100s shown in FIGS. 1 to 3 are replaced with reference numerals in the 600s, so that the inner plate-side annular recess 611 and the outer plate-side annular The description of the configuration other than the recess 651 is omitted.

  Therefore, specific forms of the inner plate-side annular recess 611 and the outer plate-side annular recess 651, which are the most characteristic features of the long-life chain 600 of this embodiment, will be described in detail with reference to FIG.

  First, as shown in FIG. 5, the outer plate-side annular recess 651 has an outer diameter that is coaxial with the pin press-fit hole so that the inner surface of the outer plate 650 is recessed and bulged to the outer surface. It is formed by curving in a state.

  Further, as shown in FIG. 5, the inner plate-side annular recess 611 has an inner diameter of the inner plate 610 that is coaxial with the bushing press-fit hole so that the outer surface of the inner plate 610 is recessed and bulged toward the inner surface. It is formed by curving in a state.

The long-life chain 600 of the present embodiment obtained in this manner has the outer plate 650 pinned so that the outer plate-side annular recess 651 dents the inner surface of the outer plate 650 and bulges to the outer surface. It is formed by bending in an expanded state coaxial with the press-fitting hole.
Accordingly, the section modulus of the outer plate-side annular recess 651 and the section modulus of the other plate portions are approximately the same, so that a decrease in strength of the outer plate 650 can be suppressed. The amount of deformation of the plate can be kept small compared to the case where the inner surface is formed by recessing in an expanded state coaxial with the pin press-fitting hole and bulging to the outer surface in an offset state. Moreover, the strength reduction of the outer plate 650 can be further suppressed.

  Further, when press punching the outer plate 650, the outer plate 650 is bent in a diameter-enlarged state coaxial with the pin press-fitting hole so that the inner surface side of the outer plate 650 is recessed and bulged to the outer surface side. The punching of the outer plate 650 and the forming of the outer plate side annular recess 651 can be performed at the same time only by using the shape mold, and therefore the outer plate side annular is separated from the punching of the outer plate 650. It is not necessary to perform machining such as grinding or milling to form the recess 651 on the outer plate 650, and the manufacturing burden of the chain can be reduced.

Further, the inner plate-side annular recess 611 is formed by bending the inner plate 610 in a diameter-enlarged state coaxial with the bush press-fitting hole so that the outer surface side of the inner plate 610 is recessed and bulged toward the inner surface side. Has been.
Accordingly, the section modulus of the inner plate-side annular recess 611 and the section modulus of the other plate portions are approximately the same, so that a decrease in the strength of the inner plate 610 can be suppressed. Compared to the case where the outer surface of the plate is recessed in the expanded diameter state coaxial with the bushing press-fitting hole and bulged to the outer surface in the offset state, the plate deformation amount can be kept small. Moreover, the strength reduction of the inner plate 610 can be further suppressed.

  Further, when the inner plate 610 is subjected to press punching, the inner plate 610 is bent in a diameter-enlarged state coaxial with the bush press-fitting hole so that the outer surface side of the inner plate 610 is recessed and bulged toward the inner surface side. Since it is possible to simultaneously perform the punching process of the inner plate 610 and the forming process of the inner plate-side annular recess 611 simply by using the shape mold, the inner plate-side annular is separated from the punching process of the inner plate 610. There is no need to perform machining such as grinding or milling to form the recess 611 on the inner plate 610, and the effect of producing the chain can be reduced.

100, 200, 600 ... Long-life chain 110, 210, 610 ... Inner plate 111, 211, 611 ... Inner plate side annular recess 111b, 211b, 611b ... Leakage blocking gap region 120, 220, 620 ... Roller 130, 230, 630 ... Bush 131, 231, 631 ... Bush protruding end 140, 240, 640 ... Inner link 150, 250, 650 ... Outer plate 151, 251 651 ... Outer plate side annular recess 151a, 251a, 651a ... Bush protruding end holding area 151b, 251b, 651b ... Leakage blocking gap area 160, 260, 660 ... Connecting pin 170, 270, 670・ ・ ・ Outside link

Claims (3)

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. In the long-life chain in which outer links formed by press-fitting into press-fitting holes are alternately connected in the longitudinal direction of the chain, and lubricating oil is interposed between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin,
A bush protruding end holding region in which an outer plate side annular recess recessed on the inner side surface of the outer plate surrounds a bush protruding end that partially protrudes from the outer surface of the inner plate, and the bush protruding end holding It is composed of a leak blocking air gap area that surrounds the area and suppresses capillary action acting on the lubricating oil,
An inner plate-side annular recess recessed in the outer surface of the inner plate is disposed opposite to the outer plate-side annular recess to constitute the leakage blocking gap region together with the outer plate-side annular recess;
The space between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin is composed of an outer plate-side annular recess and an inner plate-side annular recess via the inner surface of the outer-plate-side annular recess and the bushing protruding end. The space between the inner peripheral surface of the bush and the outer peripheral surface of the connecting pin and between the inner side surface of the annular recess on the outer plate side and the bushing protruding end are communicated with the leakage blocking gap region. A long-life chain characterized by being provided narrower than a leakage blocking gap region comprising an annular recess and an inner plate-side annular recess.   2. The long-life chain according to claim 1, wherein the outer plate-side annular recess is formed by embossing in which an inner surface of the outer plate is recessed to bulge to an outer surface in an offset state.   3. The length according to claim 1, wherein the inner plate-side annular recess is formed by embossing in which an outer surface of the inner plate is recessed to bulge to an inner surface in an offset state. Life chain.

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