JP2011027222A - Chain - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chain reducing vibration, noise, wear and heat generation by improving lubricating oil retention performance and reducing sliding resistance, and preventing formation of a crack or the like and fatigue fracture by reducing concentration of internal stress. <P>SOLUTION: In the chain 100 formed by connecting a plurality of link plates 110, 120 in such a manner that the same can alternately articulate, the plurality of link plates 110. 120 include end surfaces formed in such a manner that surface roughness in a direction perpendicular to a plate thickness direction is better than surface roughness in the plate thickness direction. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a chain in which a plurality of link plates are connected so as to be able to bend alternately. It is about.

  Conventionally, in a chain in which a plurality of link plates are connected to be able to bend alternately, when it is wound around a sprocket and driven to rotate, it reduces vibration and noise, reduces wear and heat generation, and improves durability. In order to reduce the weight, the sliding resistance of the end face of the link plate constituting the sliding portion is reduced.

  In such a known chain, in order to reduce the sliding resistance of the end surface of the link plate, a lubricating oil retaining groove is provided on the end surface of the link plate that is in sliding contact with the chain guide member to improve the retaining property of the lubricating oil. Is known (for example, see Patent Document 1).

Japanese Patent No. 4137147 (pages 5 to 8, FIGS. 4 and 5)

  However, as shown in FIG. 11, all end surfaces including the inner peripheral surface of the connecting pin hole 512 of the link plate 510 are fine in the thickness direction during the manufacturing process, for example, the punching process by a press. It is inevitable that the surface roughness in the direction orthogonal to the plate thickness becomes worse than the surface roughness in the plate thickness direction due to the formation of the stripe-shaped press marks 519 or the like.

The direction orthogonal to the plate thickness is the longitudinal direction of the chain in which the link plate 510 slides with the sprocket or the chain guide, or the sliding direction between the connecting pin hole 512 and the connecting pin, and the surface roughness in the direction orthogonal to the plate thickness is There is a problem that the sliding resistance of the end face of the link plate 510 constituting the sliding portion increases due to the deterioration.
Further, in the known groove for retaining lubricating oil, there is a problem that the fine streak-shaped press marks 519 in the thickness direction increase the sliding resistance when the end surface of the link plate 510 is in sliding contact with other members. It was difficult to solve.

  Furthermore, internal stress is generated in the link plate 510 due to the tensile force in the chain running direction and the bending force applied when the pair of plate teeth 511 are engaged with the sprocket. The direction of these forces is in the plate thickness direction. Since it is perpendicular to the direction of the stripes such as the fine streak-like press marks 519, the internal stress tends to concentrate in a deep place such as the fine streak-like press marks 519 in the thickness direction, and triggers the occurrence of cracks, etc. As a result, there is a problem that fatigue fracture is likely to occur.

  The present invention solves the problems of the prior art as described above. That is, the object of the present invention is to improve the lubricating oil retention performance and reduce the sliding resistance, and to reduce vibration, noise, and wear. It is to provide a chain that reduces heat generation and heat, and reduces the concentration of internal stress to prevent cracks and the like, thereby preventing fatigue failure.

  According to the first aspect of the present invention, in a chain in which a plurality of link plates are connected so as to be alternately bent, the plurality of link plates have a surface roughness in a direction perpendicular to the plate thickness. By having the end face formed so as to be better, the above-mentioned problems are solved.

  In the invention according to claim 2, in addition to the structure of the chain described in claim 1, the plurality of link plates include a plurality of links in a direction orthogonal to a plate thickness direction for removing press marks formed by pressing. The above-mentioned problem is further solved by having a grooved end face additionally machined with parallel grooves.

  In the invention according to claim 3, in addition to the structure of the chain described in claim 1 or 2, the link plate engages with the sprocket in the front-rear direction of at least one side surface in the width direction. The above-described problem is further solved by forming the grooved end face at the crotch bottom between the pair of plate teeth.

  In the invention according to claim 4, in addition to the structure of the chain described in any one of claims 1 to 3, the link plate is engaged with the sprocket in the front-rear direction of at least one side surface in the width direction. The above-mentioned problem is further solved by having a pair of plate teeth and the grooved end face is formed on a tooth surface portion that contacts the sprocket of the pair of plate teeth.

  In the invention according to claim 5, in addition to the structure of the chain described in claim 4, the grooved end face formed on the crotch bottom and the grooved end face formed on the tooth surface part are integrally continuous. Therefore, the above-mentioned problem is further solved.

  According to a sixth aspect of the present invention, in addition to the chain structure according to any one of the first to fifth aspects, the link plate has a flat portion on at least one side surface in the width direction, and The groove processing end face is formed on the flat portion, thereby further solving the above-mentioned problem.

  In the invention according to claim 7, in addition to the structure of the chain described in claim 6, the grooved end surface formed in the flat portion and the grooved end surface formed in the tooth surface portion are integrally continuous. Therefore, the above-mentioned problem is further solved.

  According to an eighth aspect of the present invention, in addition to the structure of the chain according to any one of the first to seventh aspects, the link plate is alternately connected so that the connection pin hole loosely fits. And the grooved end surface is formed on the inner peripheral surface of the connecting pin hole to further solve the above-mentioned problem.

  The chain according to the first aspect of the present invention is a chain in which a plurality of link plates are connected to bendable alternately, and the plurality of link plates have a surface roughness in a direction perpendicular to the plate thickness. By having an end surface that is formed to have better roughness, the surface in the direction perpendicular to the plate thickness, which is the longitudinal direction of the chain that slides with the sprocket and chain guide, and the sliding direction of the connecting pin hole and connecting pin. Since the roughness is improved, the sliding resistance can be reduced, and vibration, noise, wear and heat generation can be reduced.

  In the chain according to the second aspect of the invention, in addition to the effect produced by the chain according to the first aspect, the plurality of link plates are provided in a plurality of directions perpendicular to the plate thickness direction for removing the press marks formed by the press working. By having a grooved end face with additional parallel grooves, press marks are removed by a plurality of parallel grooves, so that the chain longitudinal direction and the connecting pin hole sliding with the sprocket and chain guide The surface roughness in the direction perpendicular to the plate thickness, which is the sliding direction with the connecting pin, is improved, the sliding resistance can be reduced, and a plurality of parallel grooves in the direction perpendicular to the plate thickness direction are made of lubricating oil. Since it also functions as a holding recess, the lubricating oil holding performance can be improved, the sliding resistance can be further reduced, and vibration, noise, wear and heat generation can be reduced.

  The chain of the invention according to claim 3 is a pair in which the link plate engages with the sprocket in the front-rear direction of at least one side surface in the width direction in addition to the effect produced by the chain according to claim 1 or 2. Plate teeth and the grooved end face is formed at the crotch bottom between a pair of plate teeth, so that the most concentrated stress is due to repeated engagement and disengagement of the sprocket and plate teeth during chain travel Since the press mark at the crotch bottom between the pair of plate teeth is removed, the occurrence of cracks and the like can be prevented, and fatigue failure can be prevented.

  In the chain according to the fourth aspect of the invention, in addition to the effect produced by the chain according to any one of the first to third aspects, the link plate is engaged with the sprocket in the front-rear direction of at least one side surface in the width direction. A pair of plate teeth, and a grooved end face is formed on the tooth surface portion that contacts the pair of plate tooth sprockets, thereby allowing a plurality of parallel surfaces on the sliding surface with the pair of plate tooth sprockets. Since the groove is pressed to remove the press marks, the sliding resistance can be reduced, and a plurality of parallel grooves in the direction perpendicular to the plate thickness direction also functions as a retaining recess for lubricating oil. Performance can be improved, sliding resistance can be further reduced, and vibration, noise, wear and heat generation can be reduced.

In the chain according to the fifth aspect of the present invention, in addition to the effect of the chain according to the fourth aspect, the grooved end surface formed on the crotch bottom and the grooved end surface formed on the tooth surface portion are integrally continuous. By reducing the number of boundary points between the grooved end surface and the non-grooved end surface, it is possible to reduce the number of processing boundary points where stress concentration is likely to occur, thereby further preventing the occurrence of cracks, Fatigue failure can be prevented.
Further, by increasing the area of the groove end face, the lubricating oil retention performance can be further improved, the sliding resistance can be further reduced, and vibration, noise, wear and heat generation can be reduced.

  In the chain according to the sixth aspect of the invention, in addition to the effect of the chain according to any one of the first to fifth aspects, the link plate has a flat portion on at least one side surface in the width direction, and the groove By forming the processing end face in the flat part, when the link plate is guided in sliding contact with the chain guide or the like, a plurality of parallel grooves are removed from the press part in the flat part that becomes the sliding surface, The sliding resistance can be reduced, and a plurality of parallel grooves in the direction perpendicular to the plate thickness direction also functions as a holding recess for the lubricating oil, so that the lubricating oil holding performance can be improved, and the sliding resistance Can be further reduced, and vibration, noise, wear and heat generation can be reduced.

In the chain according to the seventh aspect of the present invention, in addition to the effect produced by the chain according to the sixth aspect, the grooved end surface formed on the flat portion and the grooved end surface formed on the tooth surface portion are integrally continuous. By reducing the number of boundary points between the grooved end surface and the non-grooved end surface, it is possible to reduce the number of processing boundary points where stress concentration is likely to occur, thereby further preventing the occurrence of cracks, Fatigue failure can be prevented.
Further, by increasing the area of the groove end face, the lubricating oil retention performance can be further improved, the sliding resistance can be further reduced, and vibration, noise, wear and heat generation can be reduced.

  In addition to the effects of the chain according to any one of the first to seventh aspects, the chain according to the eighth aspect of the present invention has a connecting pin hole for loosely fitting the connecting pin because the link plates are alternately connected. And the grooved end surface is formed on the inner peripheral surface of the connecting pin hole, so that when the link plate is bent, the inner surface of the connecting pin hole becomes a sliding surface that comes into sliding contact with the connecting pin. Since the groove is pressed to remove the press marks, the sliding resistance can be reduced, and a plurality of parallel grooves in the direction perpendicular to the plate thickness direction also functions as a retaining recess for lubricating oil. Performance can be improved, bending resistance can be reduced, and vibration, noise, wear and heat generation can be reduced.

Explanatory drawing of the timing system of the engine to which the chain of this invention is applied. The perspective view of the silent chain which is one Example of this invention. The top view made into the partial cross section of FIG. The perspective view of the link plate of the chain which is 1st Example of this invention. The perspective view of the link plate of the chain which is 2nd Example of this invention. The perspective view of the link plate of the chain which is 3rd Example of this invention. The perspective view of the link plate of the chain which is 4th Example of this invention. The perspective view of the link plate of the chain which is 5th Example of this invention. The perspective view of the link plate of the chain which is 6th Example of this invention. The perspective view of the link plate of the chain which is 7th Example of this invention. The perspective view of the link plate of the conventional chain.

  In the present invention, in a chain in which a plurality of link plates are alternately connected to bendable, the plurality of link plates are formed so that the surface roughness in the direction perpendicular to the plate thickness is better than the surface roughness in the plate thickness direction. It has an end face that can improve lubricating oil retention performance, reduce sliding resistance, reduce vibration, noise, wear and heat generation, reduce internal stress concentration, Any specific embodiment may be used as long as it has an effect of preventing generation and preventing fatigue failure.

That is, the chain of the present invention may be a chain of any shape as long as a plurality of link plates are connected to be alternately bendable.
Further, the end surface formed so as to improve the surface roughness in the direction perpendicular to the plate thickness of the present invention to the surface roughness in the plate thickness direction may be formed by any processing method and is performed in the final chain manufacturing process. It may be formed in a proofing process (finishing process in which the chain plate is moved in the same way as actual running with a large load and the end face of the link plate is pressed against a sprocket, guide, etc. to improve surface roughness), rolling, forging, cutting, It may be formed by processing such as grinding. In particular, it is preferable to perform processing so that parallel grooves are formed after processing.

The chain 100 of the present invention is used, for example, in an engine timing system.
As shown in FIG. 1, the engine timing system uses a chain 100 endlessly suspended between a drive sprocket S1 attached to a crankshaft in an engine room and a pair of driven sprockets S2 and S3 attached to a camshaft. A tensioner lever T that guides the chain 100 while appropriately maintaining the tension of the chain 100 and a fixed guide member G that guides the travel of the chain 100 are pressed against each other.

  The tensioner lever T is swingably attached to the engine room by a mounting shaft B, is pressed and urged by a plunger P in a housing fixed to the engine room by a mounting member F, and the fixed guide member G is attached to the engine room. It is fixed by mounting shafts B1 and B2.

Below, the chain comprised as a silent chain which is one Example of this invention is demonstrated based on drawing.
As shown in FIGS. 2 and 3, in the chain 100, the connection pin holes 112 of the plurality of intermediate link plates 110 and the connection pin holes 122 of the plurality of inner link plates 120 are alternately arranged, and the connection pins 130 are loosely inserted. The connecting pins 130 are formed by fitting and fixing both ends of the connecting pins 130 to the connecting pin holes 141 of the guide plates 140 arranged on the outermost sides of the plurality of intermediate link plates 110. The link plate 120 is bent freely by rotating.

One end face of each of the intermediate link plate 110 and the inner link plate 120 is provided with a pair of plate teeth 111 and 121 in the front-rear direction, and when the chain 100 is wound around the sprocket, the intermediate link plate 110 In addition, the plate teeth 111 and 121 of the inner link plate 120 are configured to come into contact with the teeth of the sprocket.
Further, the other end surfaces of the intermediate link plate 110 and the inner link plate 120 and one end surface of the guide plate 140 form a flat portion, and are configured to be in sliding contact with the chain guide G and the tensioner lever T.

  As shown in FIG. 4, the intermediate link plate 110 of this embodiment is orthogonal to the plate thickness direction for removing press marks formed by pressing at the crotch portion 113 between the pair of plate teeth 111 in the front-rear direction. A plurality of parallel grooves in the direction are additionally machined to form a grooved end face, and the other end faces are end faces on which no groove is additionally machined.

  As a result, the press marks on the crotch portion 113 between the pair of plate teeth 111 where stress is most concentrated are removed by repeatedly engaging and disengaging the sprocket and the plate teeth 111 when the chain 100 is running. Generation | occurrence | production of a crack etc. is prevented and fatigue failure can be prevented.

  As shown in FIG. 5, the intermediate link plate 110 of the present embodiment is orthogonal to the plate thickness direction for removing press marks formed by pressing at the crotch bottom portion 113 between the pair of plate teeth 111 in the front-rear direction. A plurality of parallel grooves in the direction are additionally machined to form a grooved end face, and a plurality of parallel grooves are similarly machined in the tooth surface portion 114 that contacts the sprockets of the pair of plate teeth 111 in the front-rear direction. The groove end face is formed, and the other end face is an end face on which no additional groove is formed.

  As a result, the press marks on the crotch portion 113 between the pair of plate teeth 111 where stress is most concentrated are removed by repeatedly engaging and disengaging the sprocket and the plate teeth 111 when the chain 100 is running. Occurrence of cracks and the like is prevented, fatigue failure can be prevented, and the press marks on the tooth surface portion 114 in contact with the sprocket are removed, so that sliding resistance can be reduced, and in the plate thickness direction. A plurality of parallel grooves in the orthogonal direction also function as a holding recess for lubricating oil, improving the lubricating oil holding performance, further reducing sliding resistance, reducing vibration, noise, wear and heat generation be able to.

  Further, the groove processing end surface formed on the crotch bottom 113 and the groove processing end surface formed on the tooth surface portion 114 are integrally formed continuously, which can reduce the number of processing boundary points where stress concentration is likely to occur. Therefore, the occurrence of cracks and the like is further prevented, and fatigue failure can be prevented.

  As shown in FIG. 6, the intermediate link plate 110 of the present embodiment is orthogonal to the plate thickness direction for removing the press marks formed by pressing at the crotch bottom portion 113 between the pair of plate teeth 111 in the front-rear direction. A plurality of parallel grooves in the direction are additionally machined to form a grooved end face, and a plurality of parallel grooves are similarly machined in the tooth surface portion 114 that contacts the sprocket of the pair of plate teeth 111 in the front-rear direction. A machining end face is formed, and a plurality of parallel grooves are similarly additionally formed on the flat portion 115 on the side surface opposite to the side surface having the plate teeth 111 to form a groove machining end face. .

  As a result, the press marks on the crotch portion 113 between the pair of plate teeth 111 where stress is most concentrated are removed by repeatedly engaging and disengaging the sprocket and the plate teeth 111 when the chain 100 is running. Occurrence of cracks and the like is prevented, fatigue failure can be prevented, and the press marks on the tooth surface portion 114 in contact with the sprocket are removed, so that sliding resistance can be reduced, and in the plate thickness direction. A plurality of parallel grooves in the orthogonal direction also function as a holding recess for lubricating oil, improving the lubricating oil holding performance, further reducing sliding resistance, reducing vibration, noise, wear and heat generation be able to.

  Further, the press marks on the flat portion 115 slidably in contact with the chain guide G and the tensioner lever T are removed, so that sliding resistance can be reduced, and a plurality of parallel grooves in a direction orthogonal to the plate thickness direction are lubricated. Since it also functions as an oil retaining recess, the lubricating oil retaining performance can be improved, the sliding resistance can be further reduced, and vibration, noise, wear and heat generation can be reduced.

  Further, the groove processing end surface formed in the crotch bottom 113, the groove processing end surface formed in the tooth surface portion 114, and the groove processing end surface formed in the flat portion 115 are integrally formed continuously, that is, intermediate Since all the end faces on the outer periphery of the link plate 110 are grooved end faces, it is possible to eliminate the machining boundary where stress is likely to concentrate, so that the occurrence of cracks can be further prevented and fatigue failure can be prevented. .

  As shown in FIG. 7, the inner link plate 120 of the present embodiment is formed in the thickness direction for removing press marks formed by pressing on the inner peripheral surface 126 of the connecting pin hole 122 into which the connecting pin 130 is loosely fitted. A plurality of parallel grooves in the orthogonal direction are additionally machined to form a grooved end face, and the other end faces are end faces on which no groove is additionally machined.

  As a result, when the chain 100 is bent during travel, the press marks on the inner peripheral surface 126 of the connecting pin hole 122 that becomes the sliding surface that is in sliding contact with the connecting pin 130 can be removed, and the sliding resistance can be reduced. Since a plurality of parallel grooves also function as a retaining recess for lubricating oil, the lubricating oil retaining performance can be improved, bending resistance can be reduced, and vibration, noise, wear and heat generation can be reduced.

  As shown in FIG. 8, the inner link plate 120 of the present embodiment is formed in the thickness direction to remove the press marks formed by pressing on the inner peripheral surface 126 of the connecting pin hole 122 into which the connecting pin 130 is loosely fitted. A plurality of parallel grooves in the orthogonal direction are additionally machined to form a grooved end face, and a plurality of parallel grooves are similarly additionally machined in the crotch bottom portion 123 between the pair of plate teeth 121 in the front-rear direction. A grooved end surface is formed, and the other end surfaces are end surfaces on which no additional grooves are formed.

  As a result, when the chain 100 is bent during travel, the press marks on the inner peripheral surface 126 of the connecting pin hole 122 that becomes the sliding surface that is in sliding contact with the connecting pin 130 can be removed, and the sliding resistance can be reduced. Since a plurality of parallel grooves also function as a retaining recess for lubricating oil, the lubricating oil retaining performance can be improved, bending resistance can be reduced, and vibration, noise, wear and heat generation can be reduced.

  Further, since the sprocket and the plate teeth 121 are repeatedly engaged and disengaged while the chain 100 is running, the press marks on the crotch bottom portion 123 between the pair of plate teeth 121 where the stress is most concentrated are removed. Is prevented, and fatigue failure can be prevented.

  As shown in FIG. 9, the inner link plate 120 of the present embodiment is formed in the plate thickness direction to remove press marks formed by pressing on the inner peripheral surface 126 of the connecting pin hole 122 into which the connecting pin 130 is loosely fitted. A plurality of parallel grooves in the orthogonal direction are additionally machined to form a groove machining end face, and a plurality of parallel grooves are similarly machined in the crotch portion 123 between the pair of plate teeth 121 in the front-rear direction. In addition to forming an end face, a plurality of parallel grooves are similarly additionally formed on the tooth face portion 124 that contacts the sprocket of the pair of plate teeth 121 in the front-rear direction to form a groove end face, and the other end faces are The end face is not subjected to additional machining of the groove.

  As a result, when the chain 100 is bent during travel, the press marks on the inner peripheral surface 126 of the connecting pin hole 122 that becomes the sliding surface that is in sliding contact with the connecting pin 130 can be removed, and the sliding resistance can be reduced. Since a plurality of parallel grooves also function as a retaining recess for lubricating oil, the lubricating oil retaining performance can be improved, bending resistance can be reduced, and vibration, noise, wear and heat generation can be reduced.

  Further, when the chain 100 travels, the sprocket and the plate teeth 121 are repeatedly engaged and disengaged to remove the press marks on the crotch portion 123 between the pair of plate teeth 121 where the stress is most concentrated. Generation is prevented, fatigue failure can be prevented, and the press marks on the tooth surface portion 124 in contact with the sprocket have been removed, so that sliding resistance can be reduced and orthogonal to the plate thickness direction. Since the parallel grooves in the direction also function as a retaining recess for lubricating oil, the lubricating oil retaining performance can be improved, the sliding resistance can be further reduced, and vibration, noise, wear and heat generation can be reduced. it can.

  Furthermore, the groove end face formed in the crotch part 123 and the groove end face formed in the tooth surface part 124 are integrally formed continuously, and the number of machining boundary points where stress concentration is likely to be reduced can be reduced. Therefore, the occurrence of cracks and the like is further prevented, and fatigue failure can be prevented.

  As shown in FIG. 10, the inner link plate 120 of the present embodiment is formed in the thickness direction for removing press marks formed by pressing on the inner peripheral surface 126 of the connecting pin hole 122 into which the connecting pin 130 is loosely fitted. A plurality of parallel grooves in the orthogonal direction are additionally machined to form a groove machining end face, and a plurality of parallel grooves are similarly machined in the crotch portion 123 between the pair of plate teeth 121 in the front-rear direction. Similarly, a plurality of parallel grooves are additionally formed on the tooth surface portion 124 that forms an end face and contacts with the sprockets of the pair of plate teeth 121 in the front-rear direction to form a groove processing end face. Similarly, a plurality of parallel grooves are additionally machined in the flat portion 125 on the side surface opposite to the width direction to form a grooved end surface.

  As a result, when the chain 100 is bent during travel, the press marks on the inner peripheral surface 126 of the connecting pin hole 122 that becomes the sliding surface that is in sliding contact with the connecting pin 130 can be removed, and the sliding resistance can be reduced. Since a plurality of parallel grooves also function as a retaining recess for lubricating oil, the lubricating oil retaining performance can be improved, bending resistance can be reduced, and vibration, noise, wear and heat generation can be reduced.

  Further, when the chain 100 travels, the sprocket and the plate teeth 121 are repeatedly engaged and disengaged to remove the press marks on the crotch portion 123 between the pair of plate teeth 121 where the stress is most concentrated. Generation is prevented, fatigue failure can be prevented, and the press marks on the tooth surface portion 124 in contact with the sprocket have been removed, so that sliding resistance can be reduced and orthogonal to the plate thickness direction. Since the parallel grooves in the direction also function as a retaining recess for lubricating oil, the lubricating oil retaining performance can be improved, the sliding resistance can be further reduced, and vibration, noise, wear and heat generation can be reduced. it can.

  Further, the press marks on the flat portion 125 that is in sliding contact with the chain guide G and the tensioner lever T are removed, and the sliding resistance can be reduced, and a plurality of parallel grooves in the direction perpendicular to the plate thickness direction are lubricated. Since it also functions as an oil retaining recess, the lubricating oil retaining performance can be improved, the sliding resistance can be further reduced, and vibration, noise, wear and heat generation can be reduced.

  Further, the groove processing end surface formed on the crotch bottom portion 123, the groove processing end surface formed on the tooth surface portion 124, and the groove processing end surface formed on the flat portion 125 are integrally formed continuously. Since all the end faces on the outer periphery of the link plate 120 are grooving end faces, it is possible to eliminate the machining boundary where stress concentration is likely to occur, thus further preventing the occurrence of cracks and the like and preventing fatigue failure. .

  As described above, according to the chain of the present invention, the lubricating oil retention performance can be improved, sliding resistance is reduced, vibration, noise, wear and heat generation are reduced, and concentration of internal stress is reduced. Thus, cracks and the like are prevented from being generated, and fatigue damage can be prevented.

  In addition, a plurality of parallel grooves in a direction orthogonal to the plate thickness direction for removing the press marks formed by pressing are also added to the flat portion in sliding contact with the chain guide G or the tensioner lever T on one end face of the guide plate 140. It may be a grooved end face that has been machined.

  In addition, on the link plates of roller chains and bush chains, the end surfaces that are in sliding contact with the component members of the link plate are additionally machined with a plurality of parallel grooves in the direction perpendicular to the plate thickness direction to remove the press marks formed by pressing. It is good also as the grooved end surface made.

  Furthermore, in the link plate of a silent chain having plate teeth on both side surfaces in the width direction, the crotch bottom portion, tooth surface portion or inner peripheral surface of the connecting pin hole is orthogonal to the plate thickness direction to remove the press marks formed by pressing. A plurality of parallel grooves in the direction to be formed may be a grooved end face that is additionally machined.

DESCRIPTION OF SYMBOLS 100 ... Chain 110 ... Intermediate | middle link plate 510 ... Link plate 111,511 ... Plate tooth | gear 112, 512 ... Connecting pin hole 113 ... Crotch bottom part 114 ... Tooth surface part 115 ... -Flat part 519-Press mark 120-Inner link plate 121-Plate tooth 122-Connecting pin hole 123-Crotch bottom part 124-Tooth surface part 125-Flat part 126- Connection pin hole inner peripheral surface 130 ... connection pin 140 ... guide plate 141 ... connection pin hole

Claims (8)

In a chain in which a plurality of link plates are connected to bend alternately,
The chain characterized in that the plurality of link plates have end faces formed so that the surface roughness in the direction orthogonal to the plate thickness is better than the surface roughness in the plate thickness direction.   The plurality of link plates have a grooved end face in which a plurality of parallel grooves in a direction orthogonal to a plate thickness direction for removing a press mark formed by pressing is additionally machined. Item 2. The chain according to item 1. The link plate has a pair of plate teeth engaged with the sprocket in the front-rear direction of at least one side surface in the width direction;
The chain according to claim 1 or 2, wherein the grooved end surface is formed at a crotch bottom portion between the pair of plate teeth. The link plate has a pair of plate teeth engaged with the sprocket in the front-rear direction of at least one side surface in the width direction;
The chain according to any one of claims 1 to 3, wherein the groove end face is formed on a tooth surface portion that contacts the pair of plate tooth sprockets.   The chain according to claim 4, wherein a grooved end surface formed in the crotch part and a grooved end surface formed in the tooth surface part are integrally continuous. The link plate has a flat portion on at least one side surface in the width direction;
The chain according to any one of claims 1 to 5, wherein the groove end face is formed on the flat portion.   The chain according to claim 6, wherein a grooved end surface formed in the flat portion and a grooved end surface formed in the tooth surface portion are integrally continuous.   The link plate has a connecting pin hole for loosely connecting a connecting pin to be connected alternately, and the grooved end surface is formed on an inner peripheral surface of the connecting pin hole. The chain according to any one of claims 1 to 7.

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