JP2014219040A - Chain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chain which facilitates the restriction of reverse bending to a set reverse bending amount, including the prevention of the occurrence of the reverse bending, while suppressing string vibration, and still reduces the friction loss with a reduction in the friction of one chain structural component against the other during restricting the reverse bending and improves the durability with a reduction in the wear.SOLUTION: A silent chain 100 includes a pair of restriction plates C for restricting the reverse bending of guide trains 101 and non-guide trains 102. The restriction plates C cannot be bent around first adjacent pins 140 in the forward bending direction and in the reverse bending direction with respect to guide plates 110 holding the first adjacent pins 140. On each restriction plate C, a second storage part 170 is provided which has a reverse bending side edge 173 as a reverse bending side stopper for allowing the movement of a second adjacent pin 150 in the forward bending direction and for preventing the movement of the second adjacent pin 150 in the reverse bending direction when abutting on the second adjacent pin 150.

Description

The present invention relates to a chain in which first and second links adjacent in the longitudinal direction are connected to bendable by pins, and more particularly to a structure that regulates reverse bending of the first and second links.
The chain is a silent chain, for example, and is used as a transmission chain in, for example, an automobile power unit.

Conventionally, in a chain such as a silent chain, pins held by a pair of holding plates of the first link are inserted into a plurality of inner plates of the second link, and the first link and the second link are connected by the pins. They are connected to each other so that they can be bent.
In this type of chain, string vibration may occur in the free span portion of the chain due to periodic bending at the time of meshing with and disengaging from the sprocket and elimination of the bending. This string vibration generates noise, loss of power for running the chain (hereinafter referred to as “friction loss”) and plate due to friction between the plate and pin and friction between adjacent plates in the width direction. And increase pin wear.
Therefore, in order to suppress the string vibration, in the free span portion, the first and second links adjacent in the longitudinal direction are opposite to the forward bending direction when wound around the sprocket from a straight line connected in a straight line. A technique for restricting reverse bending (so-called back bend) that is bent in the bending direction is known (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2005-98444 (paragraphs 0023 to 0031, FIGS. 1 to 3)

In the conventional structure that regulates reverse bending, when the first and second links are reverse bent with a certain amount of reverse bending (or bending angle), a chain such as the plates of the first and second links, etc. By generating a frictional force between the component parts, it is possible to suppress the reverse bending state in which the reverse bending amount is further increased, and it is assumed that the reverse bending state is obtained. For this reason, there has been a problem that the occurrence of reverse bending cannot be prevented.
Further, when the reverse bending is suppressed by using the frictional force between the chain components, the reverse bending amount (hereinafter referred to as “set reverse bending amount”) set in advance based on the chain design is used. There is a problem that it is difficult to realize bending, and a problem that frictional loss in the chain and wear of chain components such as a plate increase due to the frictional force.

  The present invention solves the above-mentioned problems, and an object of the present invention is to regulate reverse bending to a set reverse bending amount, including preventing occurrence of reverse bending while suppressing string vibration. To provide a chain that is easy to handle, and that reduces friction between chain components when regulating reverse bending, thereby reducing friction loss and improving durability by reducing wear. It is.

  The invention according to claim 1 includes a plurality of first links, a plurality of second links, and a plurality of pins, wherein the first link has a pair of holding plates, and the second link is the first link in the width direction. One or more inner plates arranged between a pair of holding plates, and the first link and the second link adjacent in the longitudinal direction are inserted into the inner plate and the pair of holding plates In a chain that is connected to bendable by the pin to be held and is able to travel while being wound around one or more sprockets, the first link and the second link that are linearly connected in the longitudinal direction are separated from the linear state. A reverse bend restricting portion for restricting a reverse bend that is bent from the linear state in a reverse bend direction opposite to a forward bend direction when wound on the sprocket; For the holding plate or the first adjacent pin that holds the first adjacent pin of the first adjacent pin and the second adjacent pin that are a pair of the pins adjacent in the longitudinal direction in the inner plate, It is impossible to bend in the forward bending direction and the reverse bending direction around the first adjacent pin, the reverse bending restricting portion is allowed to move in the forward bending direction of the second adjacent pin, and the second The above-described problem is solved by providing a bending control unit having a stopper that prevents the second adjacent pin from moving in the reverse bending direction by contact with the adjacent pin.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect of the invention, the stopper comes into contact with the second adjacent pin in the linear state, whereby the second in the reverse bending direction from the linear state. The above-described problem is solved by preventing the movement of the adjacent pin.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect of the invention, the bending control portion is a housing portion that forms a housing space in which the second adjacent pin is housed. The housing space has a shape that follows the trajectory of the second adjacent pin when the second adjacent pin moves in the forward bending direction, thereby solving the above-described problem.

  According to a fourth aspect of the present invention, in addition to the configuration of the first aspect of the present invention, the stopper has a stopper surface that is a flat surface that can come into contact with the second adjacent pin. This solves the above-mentioned problem.

  In addition to the configuration of the invention according to claim 4, the invention according to claim 5 is characterized in that the second adjacent pin has a contact surface made of a flat surface that can be contacted by surface contact with the stopper surface. It solves the aforementioned problems.

  According to a sixth aspect of the present invention, in addition to the configuration of the third aspect of the present invention, the accommodating portion is in sliding contact with the second adjacent pin moving in the reverse bending direction. By having the contact portion along the track, the above-described problems are solved.

  According to a seventh aspect of the invention, in addition to the configuration of the invention according to any one of the first to sixth aspects, the reverse bending restricting portion is disposed across the pair of holding plates in the width direction. The first adjacent pin and the second adjacent pin are pin components having the same shape, and both pin end portions of the pin component are attached to the holding plate. An insertion portion to be inserted; and an abutting portion to be inserted into the reverse bending restricting plate, wherein the inserting portion and the abutting portion have the same shape and a specific surface, The specific surface constitutes a rotation stop surface of the first adjacent pin and the second adjacent pin with respect to the holding plate, and the specific surface of the contact portion constitutes a contact surface capable of contacting the stopper. By solving this problem,

  In the context of the present invention, the width direction is the chain width direction and the longitudinal direction is the chain longitudinal direction. The width direction is a direction parallel to the rotation center line of the sprocket or the axial direction of the pin, and the longitudinal direction is a direction in which the chain extends along a plane orthogonal to the width direction.

  Therefore, the chain of the present invention includes a plurality of first links, a plurality of second links, and a plurality of pins, the first link has a pair of holding plates, and the second link has a pair of holdings in the width direction. 1st link and 2nd link which have one or more inner plates arrange | positioned between plates, and are adjacent in a longitudinal direction are bendable by the pin hold | maintained at a pair of holding plate while being inserted in an inner plate The chain can be wound around one or more sprockets so that the chain can be bent by pins alternately in the longitudinal direction one by one in the longitudinal direction. In addition to being connected and being able to travel in the chain traveling direction by being wound around a sprocket, the following effects specific to the present invention are exhibited.

That is, according to the chain of the present invention according to claim 1, the first link and the second link connected in a straight line in the longitudinal direction are moved in the reverse bending direction opposite to the forward bending direction when the first link is wound around the sprocket from the linear state. A reverse bend restricting portion for restricting a reverse bend that is bent from a straight state, the reverse bend restricting portion being a pair of first adjacent pins and second adjacent pins that are adjacent in the longitudinal direction in the inner plate; It is impossible to bend in the forward bending direction and the reverse bending direction around the first adjacent pin with respect to the holding plate or the first adjacent pin holding the one adjacent pin. By providing a bend control unit having a stopper that allows movement in the forward bending direction and prevents movement of the second adjacent pin in the reverse bending direction by contact with the second adjacent pin. While allowing the first and second links to bend in the forward bending direction, the portion abuts against the second adjacent pin that moves in the reverse bending direction when the first link or the second link is reversely bent. Thus, since the reverse bending is restricted by preventing the first link or the second link from bending in the reverse bending direction, the occurrence of the string vibration is suppressed, and the noise caused by the string vibration is reduced. In addition, since the regulation of reverse bending is performed not by frictional force but by contact determined by the geometry of the stopper and the second adjacent pin, compared to the case where reverse bending is regulated by the use of frictional force, It is possible to reduce the friction loss in the chain due to the regulation of reverse bending, and to improve the durability of the chain by reducing wear.
Further, since the reverse bending is regulated by the contact determined based on the geometric shape of the stopper of the bending control unit and the second adjacent pin, it is possible to easily regulate the reverse bending to the set reverse bending amount, For example, by setting the set reverse bending amount to zero, the occurrence of reverse bending can be prevented.

  According to the chain of the present invention according to claim 2, in addition to the effect of the invention according to claim 1, the stopper comes into contact with the second adjacent pin in the linear state, so that the first in the reverse bending direction from the linear state. By preventing the movement of the two adjacent pins, the stopper prevents the second adjacent pin from moving in the reverse bending direction when the first and second links are in the straight state. Since the reverse bending amount becomes zero in the contact state, and the occurrence of reverse bending can be prevented, the effect of suppressing string vibration can be improved.

  According to the chain of the present invention according to claim 3, in addition to the effect produced by the invention according to claim 1 or claim 2, the bend control part is a housing part that forms a housing space in which the second adjacent pin is housed. And the accommodating space is shaped to follow the trajectory of the second adjacent pin when the second adjacent pin moves in the forward bending direction, so that the accommodating space is moved in the forward bending direction of the first and second links. Since it becomes possible to approach the minimum necessary size for the second adjacent pin to move in the forward bending direction in order to allow bending, it is possible to suppress a decrease in strength of the reverse bending restricting portion due to provision of the accommodation space. Thus, the reverse bending restricting portion can be reduced in size and weight while ensuring the required strength of the reverse bending restricting portion.

  According to the chain of the present invention according to claim 4, in addition to the effect exerted by the invention according to any one of claims 1 to 3, the stopper is formed of a flat surface capable of contacting the second adjacent pin. Since the stopper surface is flat because the stopper surface is provided, it is easy to form the stopper surface, so that the cost can be reduced by facilitating the formation of the accommodating portion and contact with the second adjacent pin. Since the setting of the state becomes easy, the setting of the reverse bending amount with the set reverse bending amount can be facilitated.

  According to the chain of the present invention according to claim 5, in addition to the effect exerted by the invention according to claim 4, the second adjacent pin has a contact surface formed of a flat surface capable of contacting the stopper surface by surface contact. Since the stopper surface and the contact surface that are in contact with each other in order to prevent reverse bending are in contact with each other, the surface pressure at the time of contact between the stopper surface and the contact surface is reduced. The durability of the bending restricting portion and the second adjacent pin, and thus the durability of the chain can be improved.

  According to the chain of the present invention according to claim 6, in addition to the effect exhibited by the invention according to any one of claims 3 to 5, the accommodating portion moves the second adjacent pin in the reverse bending direction. By having the contact portion that is in sliding contact along the track in the process, the contact portion is formed along the track of the second adjacent pin, thereby increasing friction due to the sliding contact of the second adjacent pin with the housing portion. Since the second adjacent pin moves in the reverse bending direction while receiving sliding resistance due to contact with the contact portion while suppressing, the impact when the second adjacent pin and the stopper come into contact with each other is reduced. The collision noise caused by the contact between the adjacent pin and the stopper is reduced, and the silent performance of the chain can be improved.

  According to the chain of the present invention according to claim 7, in addition to the effect exerted by the invention according to any one of claims 1 to 6, the reverse bending restricting portion includes a pair of holding plates in the width direction. It is composed of a pair of reverse-bending restricting plates that are sandwiched, and the first adjacent pin and the second adjacent pin are pin components having the same shape, and each of both pin ends of the pin component is a holding plate. It has an insertion part to be inserted and a contact part to be inserted into the reverse bending restricting plate, and the insertion part and the contact part have the same shape and a specific surface, and the specific surface of the insertion part is held By constituting the rotation stop surface of the first adjacent pin and the second adjacent pin with respect to the plate, and the specific surface of the contact portion forming the contact surface that can contact the stopper, the reverse of the first and second links Abuts against the stopper of the reverse bending restriction plate to restrict bending The second adjacent pin and the first adjacent pin are common pin components, and the specific surface constituting the rotation stop surface of the first and second adjacent pins with respect to the holding plate is the reverse bending restriction in the second adjacent pin. Since it functions as a contact surface that contacts the stopper of the plate, it is possible to reduce the cost of the chain having the second adjacent pin that restricts reverse bending by contact with the stopper.

The principal part top view which is the cross section in the plane which shows the Example of this invention and includes the center axis line of the pin which a part of adjacent of a silent chain adjoins. FIG. 2 is a side view in which a part is a cross section and a part of chain components are omitted as viewed in the direction of arrow 2 in FIG. 1. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. The perspective view of the pin components which comprise the pin of the silent chain of FIG. The principal part side view when the silent chain of FIG. 1 is wound around a sprocket.

  The chain of the present invention includes a plurality of first links, a plurality of second links, and a plurality of pins, the first link has a pair of holding plates, and the second link is a pair of holding plates in the width direction. 1st link and 2nd link which have one or more inner plates arrange | positioned between, and are adjacent in a longitudinal direction are connected so that it can be bent by the pin hold | maintained at a pair of holding plate while being inserted in an inner plate In a chain that can run around one or more sprockets, the first link and the second link that continue in a straight line in the longitudinal direction are opposite to the forward bending direction when the first link and the second link wind around the sprocket from the straight line. A reverse bend restricting portion that restricts a reverse bend that is bent from a straight line in the reverse bend direction is provided, and the reverse bend restricting portion is a pair of pins that are adjacent in the longitudinal direction in the inner plate. With respect to the holding plate or the first adjacent pin that holds the first adjacent pin among the contact pin and the second adjacent pin, it is not bendable in the forward bending direction and the reverse bending direction around the first adjacent pin, The reverse bending restricting portion has a stopper that allows the second adjacent pin to move in the forward bending direction and prevents the second adjacent pin from moving in the reverse bending direction by contact with the second adjacent pin. By providing a control unit, it is easy to regulate the reverse bending to the set reverse bending amount, including preventing the occurrence of reverse bending while suppressing string vibration, and also restricting reverse bending. As long as the friction between the chain components is reduced, the friction loss is reduced, and the durability is improved by reducing the wear, the specific aspect is not limited. I do not care.

For example, the chain of the present invention may be a transport chain or an actuator chain in addition to the transmission chain. Accordingly, the chain device including the chain may be a chain transmission device, a chain transport device, or a device other than these devices. The sprocket around which the chain is wound may be one or more.
The chain transmission device including the chain of the present invention may be used in a power transmission device or an engine constituting the power device in a power device for an automobile (including an engine) as a machine. It may be used for machines other than devices or power units.
The chain of the present invention can be applied to any type of link chain (including a roller chain) that can be bent in the reverse bending direction in addition to the silent chain.

  The reverse bending restricting portion in the chain of the present invention is constituted by one or more reverse bending restricting members, and the reverse bending restricting member may have a plate shape or a shape other than the plate shape. Further, the reverse bending restricting member is disposed between the pair of holding plates in the width direction (for example, between adjacent inner plates) in addition to being disposed at a position sandwiching the pair of holding plates in the width direction. Alternatively, it may be integrated with the holding plate by integration means (for example, integral molding, welding). The whole or a part of the holding plate may also serve as a part of the reverse bending restricting member.

Embodiments of the present invention will be described below with reference to FIGS.
Referring to FIGS. 1 and 2, in an embodiment of the present invention, a silent chain (hereinafter referred to as “chain”) 100 as a chain is an endless transmission chain provided in a chain transmission device.

This chain transmission device includes a sprocket mechanism including a plurality of sprockets 10 (FIG. 5) around which the chain 100 is wound in addition to the chain 100, and is provided in a power transmission device of a power device for an automobile.
The chain transmission device is disposed in the chain chamber of the power unit, and the chain 100 and the sprocket 10 are lubricated with lubricating oil. For this reason, the chain chamber is in a lubricating environment with a lubricating oil or a lubricating oil atmosphere.

The chain 100 includes a plurality of guide rows 101 as a plurality of first links, a plurality of non-guide rows 102 as a plurality of second links, a plurality of pins 140 and 150, and a plurality of reverse bending restricting portions 106. Prepare as.
The guide row 101 and the non-guide row 102 that are adjacent in the longitudinal direction are connected to each other by pins 140 and 150 so that they can be bent, and all the guide rows 101 and all the non-guide rows 102 are arranged in the longitudinal direction (or chain running). Direction).

Each guide row 101 includes a guide plate 110 as a pair of holding plates, and one or more middle plates 115 in this case disposed between the pair of guide plates 110 in the width direction.
The guide plate 110 is provided with a pair of holding holes 111 separated in the longitudinal direction. The middle plate 115 has a pair of teeth 119 that are meshing portions that can mesh with the pair of first pin holes 116 and each of the plurality of sprocket teeth 11 of the sprocket 10 (FIG. 5). And are provided.

Each non-guide row 102 has one or more, here a plurality of inner plates 125. The inner plate 125 is provided with a pair of second pin holes 126 spaced apart in the longitudinal direction and a pair of tooth portions 129 that are meshing portions that can mesh with the sprocket teeth 11.
In the non-guide row 102, all the inner plates 125 are arranged between the pair of guide plates 110 in the width direction, and are arranged in a stacked state alternately with all the middle plates 115 in the width direction.

The pins 140 and 150 are inserted into the holding holes 111, the first pin holes 116, and the second pin holes 126 arranged in the width direction in the guide row 101 and the non-guide row 102 that are adjacent in the longitudinal direction. Then, it is inserted into the holding hole 111 in a non-rotatable manner by a coupling means (for example, press-fitting or engaging with the guide plate 110 in the holding hole 111), and is rotated into the first and second pin holes 116 and 126. Inserted as possible. The first and second pin holes 116 and 126 are circular holes having a circular cross-sectional shape, and are similar to a cross-sectional shape of a support portion 131 described later.
In each inner plate 125, the pair of pins 140 and 150 that are adjacent in the longitudinal direction are the first adjacent pin 140 and the second adjacent pin 150.
In addition, a cross-sectional shape is a shape when the plane orthogonal to the width direction is a cut surface.

Referring to FIG. 4, all pins 140 and 150 of the chain 100 are pin components 130 having the same shape.
Referring to FIGS. 1, 3, and 4, the pin component 130 (FIG. 3) is located between the support portion 131 that rotatably supports the middle plate 115 and the inner plate 125 and the support portion 131 in the width direction. And both pin end portions 132 to be used.
The support portion 131 has a cylindrical shape, and has an outer peripheral surface that is entirely composed of a cylindrical surface. Each pin end portion 132 is a notch portion having an outer peripheral surface composed of a specific surface 133 formed by cutting a part of a cylinder and a non-specific surface 134 other than the specific surface 133.
In the illustrated example, the pin end portion 132 is a D-cut portion whose cross-sectional shape is a D shape as a non-circular cross-sectional shape. The specific surface 133 is a flat surface made of a plane parallel to the width direction, and the non-specific surface 134 is a cylindrical surface having a central axis parallel to the width direction.

  Each pin end portion 132 has the same shape as a whole, and includes an insertion portion 135 that is inserted into the holding hole 111 of the guide plate 110 and a tip portion 136 that extends from the insertion portion 135 in the width direction and has an end surface 138. Have. The distal end portion 136 has an insertion site 137 to be inserted into a first accommodation hole 161 or a second accommodation hole 171 of a reverse bending restriction plate C described later.

  Referring also to FIG. 2, the cross-sectional shape of the holding hole 111 is similar to the cross-sectional shape of the pin end portion 132. In addition, the holding hole 111 is formed by an edge portion 112 that is a holding portion of the guide plate 110. The pins 140 and 150 inserted in the holding hole 111 are inserted into the specific surface 133 in the holding hole 111 and the engaging portion 112 a of the edge 112 by the non-circular cross-sectional shape of the holding hole 111 at the insertion portion 135. Due to the surface contact with the flat surface, the guide plate 110 is held unrotatable. Therefore, the specific surface 133 constitutes the rotation stop surfaces 147 and 157 of the pins 140 and 150.

  Referring to FIGS. 1 to 3, one or more reverse bending restricting portions 106 provided corresponding to each non-guide row 102, here, a pair of reverse bending restricting plates (hereinafter referred to as “regulating plates”). Composed of C. The pair of regulation plates C are arranged with the pair of guide plates 110 and the non-guide row 102 in between in the width direction. Each regulating plate C has a bending direction opposite to the forward bending direction, which is the bending direction when the guide row 101 and the non-guide row 102 adjacent in the longitudinal direction are wound around the sprocket 10 (FIG. 5) from the linear state. In a certain reverse bending direction, relative bending from a straight state, that is, reverse bending is regulated.

  Here, the straight state is a state in which the guide row 101 and the non-guide row 102 adjacent in the longitudinal direction are connected in a straight line in the free span portion 100a (FIG. 2). Further, the free span portion 100a is not wound around the sprocket 10 in the chain 100 (that is, not engaged with the sprocket 10), and a member other than the chain 100 (for example, a chain guide provided in the chain transmission device). It is the part that is not touching.

  Each regulation plate C has first and second accommodation holes 161 and 171 as first and second accommodation spaces respectively formed by a pair of first and second accommodation portions 160 and 170 separated in the longitudinal direction. Provided. Each accommodating part 160,170 is an edge part which forms each accommodating hole 161,171 in each regulation plate C.

The first adjacent pin 140 is prevented from being detached from the first accommodation hole 161 by a retaining means (for example, press-fitting, caulking, or welding), and is connected to a coupling means (for example, press-fitting into the first accommodation hole 161 or the first accommodation). (The engagement with the regulating plate C in the hole 161) is held non-rotatable in the first accommodation hole 161.
In the illustrated example, the first adjacent pin 140 is press-fitted into the first accommodation hole 161 as the retaining means and the coupling means at the insertion site 137, and is further accommodated in the first accommodation hole 161 as the coupling means. Due to the engagement with the portion 160, it is held on the regulation plate C in a state in which it cannot rotate within the first accommodation hole 161 and is prevented from being removed. The engagement between the insertion portion 137 and the first housing portion 160 is performed by the rotation stop surface 143 that is an engagement surface formed by the specific surface 133 of the insertion portion 137 and the engagement portion 163 of the first housing portion 160 (see FIG. 2) Engagement in surface contact with the flat surface.

  Therefore, the regulating plate C is not relatively movable with respect to the first adjacent pin 140 and further with respect to the guide plate 110 that holds the first adjacent pin 140 in a relatively unrotatable manner. It is impossible to bend in the forward bending direction and the backward bending direction around 140. For this reason, the 1st accommodating part 160 couple | bonds the control plate C with the guide plate 110 or the 1st adjacent pin 140 so that it cannot be bent in the forward bending direction and the reverse bending direction centering on the 1st adjacent pin 140. Part. Therefore, the guide plate 110 and the restriction plate C that are coupled so as not to bend in the forward bending direction and the reverse bending direction around the first adjacent pin 140 constitute one unit body that is not movable relative to each other.

The insertion site 137 of the second adjacent pin 150 includes a reverse bending side contact surface 153 that can contact the second housing portion 170 in the reverse bending direction, and a forward bending side outer surface 154 that faces the forward bending direction. It is the contact part 152 which has.
The reverse bending side contact surface 153 is configured by the specific surface 133 and is a flat surface that can come into contact with a later-described reverse bending side edge surface 173a by surface contact. In the contact state, the reverse bending side edge surface 173a Parallel planes.
The forward bending side outer surface 154 is a curved surface formed of a cylindrical surface as a column surface having a central axis parallel to the width direction. In the illustrated example, the forward bending side outer surface 154 is a forward contactable surface with a forward bending side edge surface 174a described later. It is a bending side contact surface.

  The second accommodating portion 170 allows the second adjacent pin 150 to move in the forward bending direction in the straight state (that is, when the guide row 101 and the non-guide row 102 are in the straight state), while in the straight state. This is a bending control unit that prevents the second adjacent pin 150 from moving in the reverse bending direction due to contact with the second adjacent pin 150.

Specifically, the second accommodating portion 170 includes a reverse bending side edge 173 that is a reverse bending side stopper that the reverse bending side contact surface 153 contacts in the reverse bending direction, and a forward bending side outer surface 154 that has a forward bending direction. And forwardly bent side edges 174 facing each other, and first and second connection edges 175 and 176 that are continuous with both edges, respectively. The reverse bend side edge 173 and the forward bend side edge 174 are an end portion in the reverse bend direction and an end portion in the forward bend direction, respectively, of the second housing portion 170. The pair of connection edges 175 and 176 extend in the bending direction and face each other in the longitudinal direction.
Further, the edge surface 173 a of the reverse bending side edge 173, the edge surface 174 a of the forward bending side edge 174, the edge surface 175 a of the first connection edge 175, and the edge surface 176 a of the second connection edge 176 are in the shape of the second receiving hole 171. The housing edge surface 170a that defines

  When the chain 100 is engaged with the sprocket 10 (FIG. 5), the second receiving hole 171 has the guide row 101 and the non-guide row 102 (or the unit body adjacent in the longitudinal direction) relatively forward bent direction. When the second adjacent pin 150 moves in the forward bending direction and when the chain 100 is disengaged from the sprocket 10, the guide row 101 and the non-guide row 102 are adjacent to each other (or in the longitudinal direction). A shape that follows the trajectory of the second adjacent pin 150 around the first adjacent pin 140 when the unit body is relatively bent in the reverse bending direction and the second adjacent pin 150 moves in the reverse bending direction. It is a long hole which is an arc-shaped accommodation space.

The edge surface 173a is a reverse-bending-side stopper surface made of a flat surface, and is a plane parallel to the longitudinal direction and the width direction of the guide row 101 and the non-guide row 102 in a straight state.
The edge surface 174a is a curved surface formed of a cylindrical surface as a column surface having a central axis parallel to the width direction. In the illustrated example, the forward bending side edge 174 is a forward bending side stopper with which the forward bending side outer surface 154 abuts in the forward bending direction, and the edge surface 174a is a forward bending side stopper surface.

  As described above, the reverse bending side stopper formed by the reverse bending side edge 173 and the forward bending side stopper formed by the forward bending side edge 174 are respectively provided in the second bending portion 170 in the reverse bending direction and the forward bending direction. The second housing portion 170 that houses the second adjacent pin 150 can be downsized in the bending direction (that is, the reverse bending direction and the forward bending direction), and the shape of the second housing portion 170 Therefore, it is possible to facilitate the formation of the second accommodating portion 170 while reducing the size and weight of the restriction plate C.

  It should be noted that the elastic deformation between the second adjacent pin 150 and the second accommodating portion 170 is ignored in the contact between the second adjacent pin 150 and the second accommodating portion 170 including the reverse bent side edge 173 and the forward bent side edge 174. As much as possible, the second adjacent pin 150 and the second accommodating portion 170 are substantially in contact with each other as a rigid body.

  The edge surfaces 175a and 176a of the first and second connection edges 175 and 176 have a shape following the track of the second adjacent pin 150, the edge surface 175a is a concave curved surface, and the edge surface 176a is a convex curved surface. It is. At least one of the edge surfaces 175a and 176a of the connection edges 175 and 176, in the illustrated example, both the edge surfaces 175a and 176a are inserted into the insertion site in the process in which the second adjacent pin 150 moves in the forward bending direction and the reverse bending direction. Contact portions 175b and 176b with which 137 slides are provided along the track.

A state when the chain 100 in which the set reverse bending amount is set to zero is running while being wound around the sprocket 10 will be described.
2 and 3, in the free span portion 100a, the edge surface 173a of the reverse bending side edge 173 is in contact with the reverse bending side contact surface 153 of the second adjacent pin 150 in a straight state, and is linear. The second adjacent pin 150 in the state is prevented from moving in the reverse bending direction, that is, reverse bending. For this reason, the reverse bending side edge 173 prevents the guide row 101 and the non-guide row 102 from being relatively reverse bent due to contact with the reverse bending side contact surface 153 of the second adjacent pin 150. To do. The reverse bending amount (or bending angle) at this time is zero, and the reverse bending is completely prevented.

  Referring also to FIG. 5, when the chain 100 is wound around the sprocket 10, the engagement with the sprocket 10 is started, and the guide row 101 </ b> A that is the guide row 101 in a linear state starts to bend. The second adjacent pin 150 in the straight state in the guide row 101A is a second centered on the first adjacent pin 140 in the non-guide row 102A that is the non-guide row 102 behind the guide row 101A in the chain traveling direction. In the accommodation hole 171, the guide row 101A pivots in the forward bending direction on the track, and the guide plate 101A and the guide plate 110 are integrated together with the restriction plate C that cannot be bent (relatively movable), and the forward bending direction. The non-guide row 102A is bent in the forward bending direction. When the second adjacent pin 150 comes into contact with the edge surface 174a at the forward bending side outer surface 154 (FIG. 3), the bending of the guide row 101A and the non-guide row 102A is completed.

In this bending process, the second adjacent pin 150 that pivots and slides in contact with the contact portions 175b and 176b (FIG. 2) of both edge surfaces 175a and 176a and pivots in the forward bending direction while receiving sliding resistance. Compared with the case where the edge surfaces 175a and 176a are not in contact with each other, the impact at the time of contact with the forward side edge surface 174a is alleviated, and the collision noise due to the contact is reduced.
Next, the guide row 101 behind the guide row 101A in the chain traveling direction is sequentially bent in the forward bending direction and starts meshing with the sprocket 10 as described above.

  Further, when the winding portion 100b, which is the portion of the chain 100 wound around the sprocket 10, is disengaged from the sprocket 10, the second adjacent pin 150 in the bent state is centered on the first adjacent pin 140 and the second When the second adjacent pin 150 abuts on the reverse bending side edge surface 173a at the reverse bending side contact surface 153 (FIG. 3), the second adjacent pin 150 pivots in the reverse bending direction on the track in the receiving hole 171. The guide row 101 is in a straight line state with the non-guide row 102 adjacent to the front in the traveling direction. Also in the turning movement in the bending elimination process, the impact of the second adjacent pin 150 when contacting the reverse side edge surface 173a is mitigated by the contact with the contact portions 175b and 176b, and the collision sound due to the contact is generated. To reduce.

Next, operations and effects of the embodiment configured as described above will be described.
A plurality of guide rows 101, a plurality of non-guide rows 102, and a plurality of pins 140, 150 are provided, the guide rows 101 have a pair of guide plates 110, and the non-guide rows 102 are a pair of guide plates in the width direction. Pins having a plurality of inner plates 125 disposed between the guide plates 101 and the guide rows 101 and non-guide rows 102 adjacent to each other in the longitudinal direction are inserted into the inner plate 125 and held by the pair of guide plates 110 The chain 100 has a plurality of guide rows 101 and a plurality of non-guide rows 102 in the longitudinal direction. The pins 140 and 150 are alternately connected to each other so that they can be bent, and the chain runs around the sprocket 10 It is possible to travel in the direction.

The chain 100 includes a pair of restricting plates C constituting a reverse bending restricting portion 106 that restricts the reverse bending of the guide row 101 and the non-guide row 102, and the pair of restricting plates C are the guide plate 110 or the first adjacent plate. The pin 140 cannot be bent in the forward bending direction and the reverse bending direction with the first adjacent pin 140 as a center, the restriction plate C allows the second adjacent pin 150 to move in the forward bending direction, and A second housing portion 170 having a reverse bending side edge 173 that is a reverse bending side stopper that prevents the second adjacent pin 150 from moving in the reverse bending direction by contact with the second adjacent pin 150 is provided.
As a result, the second accommodating portion 170 allows the guide row 101 and the non-guide row 102 to bend in the forward bending direction, while the reverse bending side edge 173 reverses the guide row 101 or the non-guide row 102. Reverse bending by preventing the guide row 101 or the non-guide row 102 from bending in the reverse bending direction by contacting the second adjacent pin 150 that moves in the reverse bending direction around the first adjacent pin 140 during bending. Therefore, the occurrence of string vibration can be suppressed, noise caused by the string vibration can be reduced, and the reverse bending is controlled not by frictional force but by the reverse bending side edge 173 and the second adjacent portion. Since the contact is determined by the contact shape determined by the geometric shape of the pin 150, as compared with the conventional case where the reverse bend is restricted by using the frictional force, the friction in the chain 100 accompanying the restriction of the reverse bend is used. It is possible to reduce the loss, it is possible to further improve the durability of the chain 100 by reducing wear.
Further, since the reverse bend is restricted by the contact determined based on the geometric shape of the reverse bend side edge 173 and the second adjacent pin 150, it is easy to restrict the reverse bend to the set reverse bend amount. For example, the occurrence of reverse bending can be prevented by setting the set reverse bending amount to zero.

  The reverse bending side edge 173 abuts on the second adjacent pin 150 in the linear state, thereby preventing the movement of the second adjacent pin 150 from the linear state in the reverse bending direction. Accordingly, the reverse bending side edge 173 prevents the second adjacent pin 150 from moving in the reverse bending direction when the guide row 101 and the non-guide row 102 are in the straight state, and therefore, 2 The amount of reverse bending becomes zero in the contact state with the adjacent pin 150 and the occurrence of reverse bending can be prevented, so that the effect of suppressing string vibration can be improved.

The second housing part 170 forms a second housing hole 171 in which the second adjacent pin 150 is housed, and the second housing hole 171 pivots in the forward bending direction and in the reverse bending direction when the second adjacent pin 150 is disengaged. The shape follows the trajectory of the second adjacent pin 150 when moving.
Thereby, the second adjacent pin 150 moves in the forward bending direction and the reverse bending direction in order to allow the second receiving hole 171 to be bent in the forward bending direction and the reverse bending direction of the guide row 101 and the non-guide row 102. Therefore, it is possible to reduce the strength of the restriction plate C due to the provision of the second receiving hole 171 and to secure the required strength of the restriction plate C. However, the regulation plate C can be reduced in size and weight.

  Since the reverse bending side edge 173 has the edge surface 173a which is a reverse bending side stopper surface made of a flat surface capable of contacting the second adjacent pin 150, the edge surface 173a is a flat surface. Since the formation of the stopper surface is facilitated, the cost can be reduced by facilitating the formation of the second accommodating portion 170, and the setting of the contact state with the second adjacent pin 150 is facilitated. Setting of the amount of reverse bending with the amount of bending can be facilitated.

  The abutting portions 152 of the second adjacent pins 150 have reverse-bending-side abutting surfaces 153 that are flat surfaces that can come into contact with the edge surface 173a by surface contact, so that the edges that abut against each other to prevent reverse bending Since the surface 173a and the contact surface 153 are in surface contact with each other, the surface pressure at the time of contact between the edge surface 173a and the contact surface 153 is reduced, and the durability of the regulation plate C and the second adjacent pin 150 is reduced. As a result, the durability of the chain 100 can be improved.

  The second accommodating portion 170 has contact portions 175b and 176b that are in sliding contact with each other in the process in which the second adjacent pin 150 moves in the reverse bending direction and the forward bending direction along the track of the second adjacent pin 150. As a result, the contact portions 175b and 176b are formed along the track of the second adjacent pin 150, thereby suppressing an increase in friction due to the sliding contact of the second adjacent pin 150 with the second accommodating portion 170. 2 Since the adjacent pin 150 moves in the reverse bending direction and the forward bending direction while receiving sliding resistance due to contact with the contact portions 175b and 176b, the second adjacent pin 150, the reverse bending side edge 173, and the forward bending side edge 174 The impact when the second abutment pin 150 abuts against the reverse bending side edge 173 and the forward bending side edge 174 is reduced, and the quiet performance of the chain 100 is improved. Can be made.

The reverse bending restricting portion 106 is composed of a pair of restricting plates C arranged with a pair of guide plates 110 sandwiched in the width direction, and the first and second adjacent pins 140 and 150 are pin components having the same shape. 130, each of the pin end portions 132 of the pin component 130 is inserted into the holding hole 111 of the guide plate 110, and the contact portion 152 is inserted into the second receiving hole 171 of the restriction plate C. The insertion portion 135 and the contact portion 152 have the same shape and a specific surface 133, and the specific surface 133 of the insertion portion 135 is the first and second adjacent pins 140 and 150 with respect to the guide plate 110. In order to prevent the movement of the second adjacent pin 150 in the reverse bending direction, the specific surface 133 of the contact portion 152 can contact the reverse bending side edge 173. Each bent side abutment surface 153.
As a result, the second adjacent pin 150 that can contact the reverse bent side edge 173 of the restriction plate C and the first adjacent pin 140 are common pins to restrict the reverse bending of the guide row 101 and the non-guide row 102. The specific surface 133 that is the part 130 and that forms the rotation stop surfaces 147 and 157 of the first and second adjacent pins 140 and 150 with respect to the guide plate 110 abuts against the reverse-bending side edge 173 in the second adjacent pin 150. Since it functions as the contact surface 153, the cost of the chain 100 having the second adjacent pin 150 that restricts reverse bending by contact with the reverse bending side edge 173 can be reduced.

Hereinafter, an example in which a part of the configuration of the above-described embodiment is changed will be described with respect to the changed configuration.
The first adjacent pin 140 is rotatable with respect to the restriction plate C, and the guide plate 110 and the restriction plate C are not directly bent in the forward bending direction and the reverse bending direction without passing through the first adjacent pin 140. It may be combined.
Assuming that the string vibration is suppressed, the set reverse bending amount determined by the contact between the reverse bending side edge 173 and the second adjacent pin 150 is a value other than zero, and the reverse bending is the reverse bending of the above value. It may be regulated to be an amount.
The second adjacent pin 150 may not contact the forward bent side edge 174. Further, the second storage space 170 may be open toward the forward bending direction without the second storage portion 170 having the forward bending side edge 174.
The plurality of reverse bending restricting portions 106 may be provided corresponding to only some of the plurality of non-guide rows 102 instead of being provided corresponding to all the non-guide rows 102 of the chain 100 one by one.

Each pin end portion 132 of the second adjacent pin 150 may have a D-cut cross-sectional shape only at the distal end portion 136 and a circular cross-sectional shape of the insertion portion 135. Further, the first adjacent pin 140 and the second adjacent pin 150 may have different shapes (for example, each pin end portion 132 of the first adjacent pin 140 has a circular cross-sectional shape).
A pin that connects the guide row 101 and the non-guide row 102 so as to be bendable is composed of first and second rocker pins, and only the first rocker pin that is non-rotatably held by the guide plate 110 corresponds to the pin end portion 132. You may have a part to do.
The reverse bending side stopper may be a protrusion provided on the restriction plate instead of the edge portion forming the second accommodation space. The reverse bending side stopper surface may be a curved surface.
Both the connecting edges 175 and 176 may not have the contact portions 175b and 176b, and the shape of the second accommodation hole 171 is on condition that the second adjacent pin 150 is allowed to move in the bending direction. The shape does not have to follow the trajectory.

10 ... Sprocket 11 ... Sprocket teeth 100 ... Silent chain,
100a ... Free span portion 100b ... Wound portion 101, 101A ... Guide row 102, 102A ... Non-guide row 106 ... Reverse bending restricting portion 110 ... Guide plate 111 ... Holding Hole 112 ... Edge 112a ... Engagement part 115 ... Middle plate 116 ... Pin hole 119 ... Tooth part 125 ... Inner plate 126 ... Pin hole 129 ... Tooth part 130 ... Pin component 131 ... Support part 132 ... Pin end 133 ... Specific surface 134 ... Non-specific surface 135 ... Insertion part 136 ... Tip part 137 ... Insertion site 138... End surfaces 140 and 150... Adjacent pins 147 and 157... Anti-rotation surface 152 .. Contact portion 153... Reverse bending side contact surface 154. ... Housing parts 161, 17 ... housing hole 173 ... inverse flexion-side edge (opposite the flexion-side stopper)
174 ... Forward bending side edge (forward bending side stopper)
173a ... Edge surface (reverse bending side stopper surface)
174a ... Edge surface (forward bent side stopper surface)
175, 176 ... connection edges 175a, 176a ... edge surfaces 175b, 176b ... contact portion C ... reverse bending restriction plate

Claims (7)

A plurality of first links, a plurality of second links, and a plurality of pins, wherein the first link has a pair of holding plates, and the second link is disposed between the pair of holding plates in the width direction. The first link and the second link adjacent to each other in the longitudinal direction can be bent by the pins inserted into the inner plate and held by the pair of holding plates. In a chain that can be traveled by being wound around one or more sprockets,
The reverse bending that is bent from the linear state in the reverse bending direction opposite to the forward bending direction when the first link and the second link that are linearly connected in the longitudinal direction are wound around the sprocket from the linear state is regulated. Equipped with a reverse bending restricting section,
The holding plate that holds the first adjacent pin of the first adjacent pin and the second adjacent pin that are a pair of the pins adjacent in the longitudinal direction in the inner plate, With respect to the first adjacent pin, it is not bendable in the forward bending direction and the reverse bending direction around the first adjacent pin,
The reverse bending restricting portion allows movement of the second adjacent pin in the forward bending direction, and prevents movement of the second adjacent pin in the reverse bending direction by contact with the second adjacent pin. A chain characterized in that a bending control part having a stopper is provided. The chain according to claim 1,
The chain, wherein the stopper is in contact with the second adjacent pin in the linear state, thereby preventing the movement of the second adjacent pin in the reverse bending direction from the linear state. A chain according to claim 1 or claim 2, wherein
The bending control unit is a storage unit that forms a storage space in which the second adjacent pin is stored;
The chain characterized in that the accommodation space has a shape that follows a path of the second adjacent pin when the second adjacent pin moves in the forward bending direction. A chain according to any one of claims 1 to 3,
The chain, wherein the stopper has a stopper surface that is a flat surface that can come into contact with the second adjacent pin. The chain according to claim 4,
The chain, wherein the second adjacent pin has a contact surface formed of a flat surface that can contact the stopper surface by surface contact. A chain according to any one of claims 3 to 5,
The chain, wherein the housing portion has a contact portion that slides in the process of moving the second adjacent pin in the reverse bending direction along the track. A chain according to any one of claims 1 to 6,
The reverse bending restricting portion is composed of a pair of reverse bending restricting plates disposed across the pair of holding plates in the width direction;
The first adjacent pin and the second adjacent pin are pin components having the same shape,
Each of both pin end portions of the pin component has an insertion portion inserted into the holding plate and a contact portion inserted into the reverse bending restriction plate,
The insertion part and the contact part have the same shape and a specific surface,
The specific surface of the insertion portion constitutes a rotation stop surface of the first adjacent pin and the second adjacent pin with respect to the holding plate;
The chain, wherein the specific surface of the contact portion constitutes a contact surface that can contact the stopper.

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