JP6108611B2 - chain - Google Patents

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, string vibration may occur in a free span portion of the chain due to periodic bending at the time of meshing with and disengaging from a 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 regulating reverse bending (so-called back bend) that bends in the bending direction is known (for example, see Patent Document 1).

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

By the way, 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), the plates of the first and second links, etc. By generating a frictional force between the chain components, the reverse bending amount is further prevented from becoming a reverse bending state and the reverse bending state is suppressed (that is, the reverse bending amount is limited). Value).
As described above, when reverse bending is suppressed by using the frictional force between the chain components, the frictional force increases the friction loss in the chain and the wear of the chain components such as the plate. was there.

Further, in addition to the pins held on the holding plate of the first link, another pin (for example, when the pin is composed of a plurality of rocker pins, is also provided in the pin hole of the inner plate of the second link. In this case, the pin hole becomes large, so that the inner plate is enlarged to ensure the rigidity of the plate, and the chain pitch is increased. There was a problem that became difficult. In addition, since a plurality of pins are required, the number of pins and the number of assembling steps are increased, which causes a problem of increasing the cost of the chain.
Furthermore, there is a problem that it is difficult to reduce the size of the chain when a dedicated member for restricting reverse bending is required.

  The present invention solves the above-mentioned problems, and an object of the present invention is to reduce friction between chain components due to regulation of reverse bending while suppressing string vibration, thereby reducing friction loss. It is to provide a chain in which durability is improved by reducing wear, and durability is improved, and further, downsizing is facilitated and cost is reduced.

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 a pair in the width direction. One or more inner plates arranged between the holding plates, and the first link and the second link which are adjacent in the longitudinal direction are rotatable in the rotation direction in the pin holes of the inner plate. In a chain that is inserted and can be bent by a single pin that is held by the pair of holding plates in a state in which the rotation of the holding plate is restricted, and can be wound around one or more sprockets. the inner plate has a plate counter flection regulating portion provided on at least one of opposite sides of the two pin holes of the inner plate, fitted to the pin hole through which the plate counter flection regulating portion is provided Pin, having said plate counter flection regulating portion can abut pin reverse bend restricting portion, by said plate counter flection regulating portion and the pin opposite bending regulating portion abuts with the rotational direction, said to The reverse bending amount of the reverse bending in which the first link and the second link are bent from the straight state in the reverse bending direction opposite to the forward bending direction when the first link and the second link are wound in a straight line from the linear state. By being regulated, the above-mentioned problems are solved.

According to a second aspect of the present invention, in addition to the configuration of the first aspect of the invention, a hole peripheral wall forming the pin hole in the inner plate provided with the plate reverse bending restricting portion has a contour of the pin hole. The outer peripheral portion of the pin fitted into the pin hole provided with the plate reverse bending restricting portion has an outer peripheral surface defining an outer periphery of the pin, and the plate The reverse bending restricting portion has a plate contact surface that is a part of the peripheral wall surface of the hole, and the pin reverse bending restricting portion has a pin contact surface that is a part of the outer peripheral surface, and the plate contact surface The above-described problem is solved by restricting the reverse bending amount by the contact between the surface and the pin contact surface.

According to a third aspect of the present invention, in addition to the configuration of the second aspect of the invention, the hole peripheral wall surface is a plate arc surface centered on a pin hole center line of the pin hole provided with the plate reverse bending restricting portion. And an outer peripheral surface of a pin that fits into a pin hole provided with the plate reverse bending restricting portion has a pin arc surface centered on a pin center line of the pin, and the plate arc surface and the pin An arcuate surface is slidably contacted when the first link and the second link rotate about the pin center line relative to the forward bending direction and the reverse bending direction, and the plate arc surface and the pin arc The cross-sectional shape of the surface is an arc of a plate virtual circle centered on the pin hole center line and a pin virtual circle centered on the pin center line. Within plate virtual circle By position, it is obtained by solving the problems described above.

According to a fourth aspect of the invention, in addition to the configuration of the second or third aspect of the invention, an outer peripheral surface of a pin that fits into a pin hole provided with the plate reverse bending restricting portion has the plate reverse bending. A pin clearance forming surface that forms a rotation clearance that allows relative rotation of the restricting portion between the hole peripheral wall surface and the pin reverse bending restricting portion protrudes from the pin clearance forming surface; Thus, the above-mentioned problems are solved.

The invention according to claim 5 is the silent chain in which the chain is arranged in a lubricating oil atmosphere in addition to the configuration of the invention according to any one of claims 2 to 4, and the holding plate is a guide plate The first link has one or more middle plates disposed adjacent to the inner plate in the width direction between the pair of guide plates, and the pin is provided with the plate reverse bending restricting portion A pin that fits into the hole is inserted into the pin hole of the middle plate so as to form a space between the pin and the outer peripheral surface of the pin, and the space is seen from the width direction of the plate reverse bending restricting portion. By being in a position overlapping the plate contact surface in the relative rotation range, the above-described problems are solved.

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 pin center line of the pin, and the longitudinal direction is a direction in which the chain extends along a plane orthogonal to the width direction.
Moreover, a cross section is a cross section when the plane orthogonal to the width direction is a cut surface, and a cross section shape is the shape of the member or the site | part of a member in a cross section.

  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. A first link and a second link, which have one or more inner plates arranged between them and are adjacent in the longitudinal direction, are inserted into the pin holes of the inner plate so as to be pivotable in the pivoting direction, and a pair of holdings The chain is connected to the plate by a single pin that is held in a state in which the rotation is restricted, and is capable of traveling while being wound around one or more sprockets. In addition, the plurality of second links are connected to bendable alternately by pins one by one in the longitudinal direction, and can be wound around the sprocket to travel in the traveling direction. Achieve the effect.

That is, according to the chain of the present invention according to claim 1, the inner plate has a plate counter flection regulating portion provided on at least one of opposite sides of the two pin holes of the inner plate, the plate counter flection The pin that fits into the pin hole in which the restricting portion is provided has a pin reverse bend restricting portion that can come into contact with the plate reverse bend restricting portion, and the plate reverse bend restricting portion and the pin reverse bend restricting portion rotate in the rotation direction. The first link and the second link are in contact with each other in the straight direction, and the reverse of the reverse bend in which the first link and the second link bend from the straight state to the reverse bend direction opposite to the forward bend direction when wound around the sprocket. By restricting the amount of bending, the plate reverse bending restricting portion and the pin reverse bending restricting portion that are in contact with each other restrict the reverse bending amount (or reverse bending) of the first and second links, so that the string vibration Generation is suppressed, it is possible to reduce the noise caused by the chords vibration. The reverse bend amount is regulated by the contact of the plate reverse bend restricting portion and the pin reverse bend restricting portion that rotate relative to each other in the turning direction. Therefore, the reverse bend amount is restricted by using the frictional force. Compared with the case where the amount of friction is reduced, the friction loss in the chain due to the regulation of the amount of reverse bending can be reduced, and the wear of the chain components due to the regulation of the amount of reverse bending is reduced, improving the durability of the chain. Can be made.

In addition, the plate reverse bending restricting portion and the pin reverse bending restricting portion are provided by using the inner plate and the pin inserted rotatably in the pin hole of the inner plate, respectively. The degree of freedom in selecting the rotation direction position where the reverse bending restricting portion is provided increases. For this reason, the freedom degree of arrangement | positioning of the both reverse bending control part in a rotation direction becomes large, and the freedom degree of design of the chain which has a reverse bending control function can be enlarged.
In addition, since only one pin is inserted into the pin hole, it is possible to reduce the diameter of the pin hole. Therefore, the chain pitch can be reduced and the chain having the reverse bending restriction function can be easily reduced in size. Furthermore, since the number of pins and the number of assembly steps are reduced, the cost of the chain can be reduced.

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 hole peripheral wall forming the pin hole in which the plate reverse bending restricting portion is provided in the inner plate is a pin. A hole peripheral wall surface that defines the contour of the hole, and the outer peripheral portion of the pin that fits into the pin hole provided with the plate reverse bending restricting portion has an outer peripheral surface that defines the outer periphery of the pin, and The bending restricting portion has a plate abutting surface that is a part of the peripheral wall surface of the hole, and the pin reverse bending restricting portion has a pin abutting surface that is a part of the outer peripheral surface. By restricting the amount of reverse bending by contacting the surface, the plate reverse bending restricting portion and the pin reverse bending restricting portion are located in the pin hole, so that each reverse bending restricting portion is outside the pin hole, for example, A plate facing the outer periphery of the inner plate and the width direction. As compared with the case provided over preparative side enables size reduction of the inner plate, it is possible to facilitate downsizing and weight reduction of the chain with reverse bending regulatory functions.

According to the chain of the present invention according to claim 3, in addition to the effect of the invention according to claim 2, the hole peripheral wall surface is centered on the pin hole center line of the pin hole provided with the plate reverse bending restricting portion. The pin outer peripheral surface that fits into the pin hole provided with the plate reverse bending restricting portion has a pin arc surface centered on the pin center line of the pin, the plate arc surface and the pin The arc surface is in sliding contact when the first link and the second link rotate about the pin center line in the forward bending direction and the reverse bending direction, and the cross-sectional shapes of the plate arc surface and the pin arc surface are Each of the circular arc of the plate virtual circle centered on the pin hole center line and the pin virtual circle centered on the pin center line, and in the cross-section, the entire peripheral wall surface of the hole is located within the plate virtual circle. Hole, inner play Because the size is within the virtual plate circle defined by the radius of the circular arc surface of the plate required for relative rotation between the pin and the pin, the plate reverse bending restricting part or part of the hole circumferential wall surface is located outside the virtual plate circle. Compared to the case, the pin hole becomes smaller, so that the strength of the inner plate is improved, and the durability of the inner plate, and hence the durability of the chain can be improved.
In addition, since the plate reverse bending restricting portion comes into contact with the pin reverse bending restricting portion in the rotation direction in the pin hole, the plate reverse bending restricting portion is positioned radially inward from the plate arc surface. The strength of the inner plate can be improved by the restricting portion.

According to the chain of the present invention according to claim 4, in addition to the effect of the invention according to claim 2 or claim 3, the outer peripheral surface of the pin fitted into the pin hole provided with the plate reverse bending restricting portion is The plate reverse bending restricting portion has a pin clearance forming surface that forms a rotation clearance that allows relative rotation of the plate reverse bending restricting portion with the peripheral wall surface of the hole, and the pin reverse bending restricting portion protrudes from the pin clearance forming surface. Since the pin reverse bending restricting portion protrudes from the pin clearance forming surface, the pin reverse bending restricting portion can be used to improve the strength of the pin. The durability of can be improved.

According to the chain of the present invention according to claim 5, in addition to the effect of the invention according to any one of claims 2 to 4, the chain is a silent chain arranged in a lubricating oil atmosphere and is held The plate is a guide plate, and the first link has one or more middle plates arranged in the width direction adjacent to the inner plate between the pair of guide plates, and is provided with a plate reverse bending restricting portion. The pin that fits into the pin hole is inserted into the pin hole of the middle plate, forming a space between the outer peripheral surface of the pin, and the space rotates relative to the plate reverse bending restricting portion when viewed from the width direction. Because the lubricant oil that has flowed into the space after entering the gap in the width direction of the inner plate and the middle plate is separated from the inner surface of the inner plate and the middle plate. In the rate pin hole, it flows into the clearance between the restriction portions formed between the two bending restriction portions, and can be supplied to both contact surfaces, so that the wear on both contact surfaces is caused by the lubricant supplied from the space. This can reduce the durability of the silent chain.
Further, when the two reverse bending restricting portions approach each other in the rotation direction, both the resistance due to discharging the lubricating oil flowing into the clearance between the restricting portions and the oil film adhering to both contact surfaces Since the impact at the time of contact of the contact surface is alleviated, the collision noise caused by the contact is reduced, and the quietness performance of the chain can be improved.

The principal part top view which shows the Example of this invention and a part of silent chain is a cross section in a pitch surface. FIG. 2 is a sectional view taken along line 2-2 in FIG. 1. FIG. 3 is an enlarged view of three parts in FIG. 2. FIG. 2 is a diagram for explaining a state in which the silent chain of FIG. 1 is wound around a rotating sprocket and bent, and (a), (d), and (g) are side views of main parts in which some chain components are omitted. , (B), (c) are enlarged views of portions b, c of (a), (e), (f) are enlarged views of portions e, f of (d), (h), (i). FIG. 4 is an enlarged view of h and i parts in (g).

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. A first link and a second link, which have one or more inner plates arranged between them and are adjacent in the longitudinal direction, are inserted into the pin holes of the inner plate so as to be pivotable in the pivoting direction, and a pair of holdings It is connected to a plate so that it can be bent by a single pin that is held in a state where its rotation is restricted, and can run around one or more sprockets . A plate reverse bend restricting portion provided on at least one of the opposite sides of the pin hole, and a pin fitted to the pin hole provided with the plate reverse bend restricting portion can contact the plate reverse bend restricting portion. Pin reverse bending The first link and the second link are wound on the sprocket from a linear state in which the first link and the second link are linearly connected in the longitudinal direction when the plate reverse bend restricting portion and the pin reverse bend restricting portion are contacted in the rotation direction. When the reverse bending amount of the reverse bending that is bent from the linear state to the reverse bending direction opposite to the forward bending direction is restricted, the chain vibration between the chain components due to the restriction of the reverse bending is suppressed while suppressing the string vibration. If friction is reduced, friction loss is reduced, wear is reduced, durability is improved, and miniaturization is facilitated and cost is reduced. Any aspect may be used.

For example, the chain of the present invention includes a silent chain and a plurality of second links composed of a plurality of first links and a pair of second link plates composed of a pair of first link plates in addition to the silent chain. A link chain including a link (including a roller chain) may be used.
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.
A chain transmission device including a chain according to the present invention is used in a power transmission device or an engine constituting a power device in an automobile power device as a machine. May be used.
The plate reverse bending restricting portion is provided in the inner plate at a portion other than the hole peripheral wall surface or the hole peripheral wall surface. Moreover, a pin reverse bending | flexion control part is provided in the arbitrary surfaces including an outer peripheral surface in a pin.

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 as a winding mechanism constituted by a plurality of sprockets 10 (FIG. 4) around which the chain 100 is stretched in addition to the chain 100, and a power transmission device for a power device for an automobile. Prepared for.
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 guide row 101 as a plurality of first links, a non-guide row 103 as a plurality of second links, and a plurality of pins 150 as chain components. The guide rows 101 and non-guide rows 103 that are adjacent in the longitudinal direction are flexibly connected by a single pin 150, and all the guide rows 101 and all the non-guide rows 103 are alternately arranged in the longitudinal direction one by one. It is connected.

Each guide row 101 includes a guide plate 110 as a pair of holding plates, and one or more middle plates 120 in this case disposed between the pair of guide plates 110 in the width direction.
The guide plate 110 is provided with a holding hole 111 as a pair of pin holding portions spaced apart in the longitudinal direction. The middle plate 120 has a pair of tooth portions 128 that are meshing portions that can mesh with the pair of first pin holes 121 and the plurality of sprocket teeth 11 (FIG. 4) of the sprocket 10 separated in the longitudinal direction. And are provided.

Each non-guide row 103 has one or more inner plates 130 that are arranged in the width direction here. The inner plate 130 is provided with a pair of second pin holes 131 spaced apart in the longitudinal direction and a pair of teeth 138 that are meshing portions that can mesh with the sprocket teeth 11.
Each inner plate 130 of the non-guide row 103 is disposed between the pair of guide plates 110 in the width direction. All the middle plates 120 and all the inner plates 130 are arranged in a stacked state alternately one by one in the width direction, one by one in the illustrated example.

  The holding hole 111, the first pin hole 121, and the second pin hole 131 are plane-symmetric in the guide plate 110, the middle plate 120, and the inner plate 130 with the center planes P 1, P 2, and P 3 orthogonal to the longitudinal direction as symmetry planes. Shape. These central planes P1, P2, and P3 are planes that bisect the chain pitch that is the longitudinal interval of the pin center line L0 of the pair of pins 150 for each of the guide plate 110, the middle plate 120, and the inner plate 130. is there.

For convenience of explanation, the side that bends when the chain 100 meshes with the sprocket 10 (FIG. 4) with respect to the pitch surface Pp (FIG. 2) for each plate 110, 120, 130 is the bending side. The opposite side is called the anti-bending side. Each pin hole 121, 131 has a plane-symmetric shape with respect to the pitch plane Pp. The pitch surface Pp is a plane including a pair of pin center lines L0 for each of the guide rows 101 and the non-guide rows 103 arranged in a straight line in the chain 100.
Further, in any part of each plate 110, 120, 130, in the longitudinal direction, the side closer to the center planes P1, P2, P3 is relatively the center side, and the side far from the center planes P1, P2, P3 is the anti-center. The side.

The pins 150 are inserted in the holding holes 111, the first pin holes 121, and the second pin holes 131 arranged in the width direction in the guide row 101 and the non-guide row 103 that are adjacent in the longitudinal direction. It is retained by a retaining means (for example, press-fitting or caulking) and held in a state in which its rotation is restricted by a coupling means (for example, press-fitting or engagement with the guide plate 110). For this reason, the pin 150 is inserted into the holding hole 111 and the first pin hole 121 in a state in which the rotation is restricted, while the pin 150 rotates in the rotation direction around the pin center line L in the second pin hole 131. It is inserted movably. For this reason, the pin 150 supports the inner plate 130 so as to be rotatable about the pin center line L0. The pin center line L0 is a rotation center line when the inner plate 130 and the pin 150 relatively rotate, and is parallel to the width direction in the state shown in FIGS.
In the illustrated example, the pin 150 is inserted into the holding hole 111 as a retaining means and a coupling means, and further engaged with the peripheral wall 112 of the guide plate 110 in the holding hole 111 as a coupling means. 110 is held in a non-rotatable fixed state.
All pins 150 of the chain 100 have the same shape. Moreover, the cross-sectional shape of each pin 150 is the same at any position in the width direction.

  Referring to FIGS. 1 and 2, the chain 100 is provided with a reverse bending restricting portion B composed of a plate reverse bending restricting portion 133 of the inner plate 130 and a pin restricting portion 153 of the pin 150. The reverse bending restricting portion B is configured such that the guide row 101 and the non-guide row 103 adjacent in the longitudinal direction are bent relatively in the reverse bending direction from the linear state (the state shown in FIG. 2). The amount of reverse bending of the reverse bending is restricted. In the illustrated example, in the straight state, the reverse bending restricting portion B restricts the amount of reverse bending to zero, thereby preventing the occurrence of reverse bending.

  Here, the straight state is a state in which, for example, in the free span portion 100a (FIG. 2), the guide row 101 and the non-guide row 103 adjacent in the longitudinal direction are connected in a straight line. 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 (FIG. 4)), and a member other than the chain 100 (for example, a chain transmission device) It is a portion not in contact with the chain guide provided.

  The reverse bending direction is a bending direction opposite to the forward bending direction. The forward bending direction is a relative bending from a linear state when the guide row 101 and the non-guide row 103 adjacent in the longitudinal direction are wound around the sprocket 10 when the chain 100 is engaged with the sprocket 10 (FIG. 4). That is, the bending direction when forward bending. In addition, when the chain 100 is disengaged from the sprocket 10, the guide row 101 and the non-guide row 103 wound around the sprocket 10 are rotated in the reverse bending direction from the forward bent state to a linear state.

Hereinafter, the chain 100 will be described focusing on the reverse bending restricting portion B.
Referring to FIGS. 2 and 3, the middle plate 120 has a first hole peripheral wall 122 that forms a first pin hole 121. The first hole peripheral wall 122 has a first hole peripheral wall surface 123 that defines the contour of the first pin hole 121. The cross-sectional shape of the first hole peripheral wall surface 123 is a circle having one radius around the first pin hole center line L1 of the first pin hole 121, and the first pin hole center line L1 is a second pin that will be described later. In a state where the pin hole center line L2 coincides, the first hole peripheral wall surface 123 as a whole is located on a plate virtual circle 149 described later.

  The first hole peripheral wall surface 123 includes a contact surface 124 that is an arc surface that contacts the outer peripheral surface 162 of the pin 150 at a pin arc surface 165 described later, and a non-contact surface 125 that is an arc surface that does not contact the outer peripheral surface 162. Have. In the first pin hole 121, the pin 150 forms a space S between the non-contact surface 125 and a later-described regulating portion outer surface 163 and pin connection surface 166. In this space S, lubricating oil that has entered the gap in the width direction between adjacent plates in the width direction, that is, in the illustrated example, the gap in the width direction between the middle plate 120 and the inner plate 130 can be introduced and stored.

The inner plate 130 has a second hole peripheral wall 132 that forms a second pin hole 131. The second hole peripheral wall 132 has a second hole peripheral wall surface 142 that defines the contour of the second pin hole 131.
The second hole peripheral wall 132 includes a plate reverse bending restricting portion (hereinafter referred to as “plate restricting portion”) 133, a plate arc portion 135, and a plate connecting portion 136 that connects the plate restricting portion 133 and the plate arc portion 135. Have The second hole peripheral wall surface 142 serves as a plate clearance forming surface that a plate restricting portion wall 143 of the plate restricting portion 133, a plate arc surface 145 of the plate arc portion 135, and a plate connecting portion 136 serving as a plate clearance forming portion. Plate connection surface 146.

The plate restricting portion 133 is a protruding portion protruding radially inward with respect to the plate connecting surface 146 and the plate arcuate surface 145, and is provided at an appropriate circumferential position on the second hole peripheral wall 132. Then, it exists in the position which crosses the pitch surface Pp in the maximum protrusion part. The circumferential end portions 133a and 133b of the plate restricting portion 133 are smoothly connected to the plate connecting portion 136 and the plate arc portion 135, respectively, with the restricting portion wall surface 143 being a curved surface.
A part of the regulating portion wall surface 143 that is a convex curved surface as a convex surface is a plate contact surface 144. The plate contact surface 144 is located on the anti-bending side in the illustrated example.
The radial direction and the circumferential direction (also the rotation direction) are a radial direction and a circumferential direction around the pin or the pin center line L0, respectively.

The plate arc surface 145 is a curved surface whose cross-sectional shape is an arc of a plate virtual circle 149 centered on the second pin hole center line L2 of the second pin hole 131. In the illustrated example, the arc is continuous in the circumferential direction and has a circumferential length corresponding to the dominant arc of the plate virtual circle 149.
In the drawing, for convenience of explanation, the pin center line L0 and the first and second pin hole center lines L1 and L2 coincide with each other, that is, when the center lines L0, L1 and L2 are in a concentric state. FIG. In the actual chain 100, the pin center line L0 and the first pin hole center line L1 are substantially concentric, and the pin center line L0 and the second pin hole center line L2 are not concentric.
In the cross section, the second hole peripheral wall surface 142 is located entirely within the plate virtual circle 149, and accordingly, the restricting portion wall surface 143 and the plate connection surface 146 are also located within the plate virtual circle 149. The plate connection surface 146 is located on the plate virtual circle 149. In each of the pair of first pin holes 121 in the inner plate 130, the plate restricting portion 133 is located on the center side in the longitudinal direction.

The pin 150 has an outer peripheral portion 152. The outer peripheral portion 152 has an outer peripheral surface 162 that defines an outer contour of the pin 150.
The outer peripheral portion 152 includes a pin reverse bending restricting portion (hereinafter referred to as “pin restricting portion”) 153, a pin arc portion 155, and a pin connecting portion 156 that connects the pin restricting portion 153 and the pin arc portion 155. .
The outer peripheral surface 162 is a pin connection surface as a pin clearance forming surface of a restriction portion outer surface 163 of the pin restriction portion 153, a pin arc surface 165 of the pin arc portion 155, and a pin connection portion 156 as a pin clearance formation portion. 166.

The pin restricting portion 153 is a protruding portion that protrudes with respect to the pin connection surface 166, and is provided at an appropriate circumferential position corresponding to the plate restricting portion 133 in the outer peripheral portion 152. It is located on the anti-bending side as a whole. The restricting portion outer surface 163 is a convex curved surface as a convex surface that is smoothly connected to the pin arc surface 165 and the pin connection surface 166 in the circumferential direction on the bent side. A part of the regulating portion outer surface 163 is a pin contact surface 164 that can contact the plate contact surface 144 in a surface contact state.
The plate contact surface 144 and the pin contact surface 164 correspond to the relative rotation of the inner plate 130 and the pin 150 when the guide row 101 and the non-guide row 103 adjacent in the longitudinal direction rotate relatively in the reverse bending direction. When moving (hereinafter referred to as “reverse rotation”), the guide row 101 and the non-guide row 103 are reversely bent, that is, the amount of reverse bending is regulated by approaching and contacting in the rotation direction.
On the other hand, the plate abutting surface 144 and the pin abutting surface 164 are arranged so that the guide plate 101 and the non-guide row 103 adjacent in the longitudinal direction of the inner plate 130 and the pin 150 are relatively bent or rotated in the forward bending direction. During relative rotation (hereinafter referred to as “forward rotation”), the guide row 101 and the non-guide row 103 are allowed to bend forward by moving away in the rotation direction.

The pin arc surface 165 is a curved surface whose cross-sectional shape is an arc of a pin virtual circle 169 centered on the pin center line L0. In the illustrated example, the arc is continuous in the circumferential direction and has a circumferential length corresponding to the dominant arc of the pin virtual circle 169. In the cross section, the outer peripheral surface 162 is located in its entirety, and accordingly, the regulating portion outer surface 163 and the pin connection surface 166 are located within the pin imaginary circle 169, and the pin center line L0 and the second pin. The hole center line L2 is positioned concentrically, that is, within the plate virtual circle 149 when the plate virtual circle 149 and the pin virtual circle 169 are concentric.
The plate arc surface 145 and the pin arc surface 165 are slidable contact surfaces that are in sliding contact with each other when the inner plate 130 and the pin 150 are rotated forward and backward about the pin center line L0.
In practice, the radius of the plate virtual circle 149 is slightly larger than the radius of the pin virtual circle 169 so that both the arc surfaces 145 and 165 can slide, but in FIG. , 169 are shown by one two-dot chain line.

The pin connection surface 166 cooperates with the restricting portion wall surface 143 and the plate connecting surface 146 to allow relative rotation of the restricting portions 133 and 153, and thus allow the relative rotation of the inner plate 130 and the pin 150. Form. The rotation clearance C1 is located on the bending side in the illustrated example.
The pin connection surface 166 extends in the rotation direction along the rotation trajectory in the forward rotation and reverse rotation of the plate restricting portion 133, and the relative rotation (or the guide row 101) of both the restricting portions 133 and 153. In addition, the plate restricting portion 133 can be slidably contacted locally so as not to hinder the bending of the non-guide row 103 (FIGS. 4E and 4H). In this way, the pin connection surface 166 can be brought close to the restriction portion wall surface 143 until the restriction portion wall surface 143 and the pin connection surface 166 come into contact with each other, so that the restriction portion wall surface 143 and the pin connection surface 166 are not in contact with each other. Compared to a certain case, the pin 150 can be enlarged at the pin connection portion 156. Further, when the guide row 101 and the non-guide row 103 are relatively rotated in the reverse bending direction, both the restriction portions 133 and 153 receive resistance due to the sliding contact between the plate restriction portion 133 and the pin connection surface 166. Since it rotates relatively in the reverse bending direction, the impact when both contact surfaces 144, 164 contact is alleviated, and the collision noise caused by the contact between both contact surfaces 144, 164 is reduced, and the chain The silent performance of 100 can be improved.

When both contact surfaces 144 and 164 are in contact, the two contact surfaces 144 and 164 are circumferentially arranged between the second hole peripheral wall surface 142 and the outer peripheral surface 162 in the second pin hole 131. A clearance C1 for rotation and a clearance C2 between the regulating portions having a volume smaller than the volume of the rotation clearance C1 are formed. The clearance C2 between the restricting portions is formed by the restricting portion wall surface 143 and the restricting portion outer surface 163. When both the contact surfaces 144 and 164 are separated during the forward rotation of the pin 150 and the inner plate 130, the clearance between the restricting portions C2 is set. The volume increases (FIGS. 4B, 4E and 4H).
Further, the space S formed in the first pin hole 121 is located at a position overlapping the plate contact surface 144 in the relative rotation range of the plate restricting portion 133 in the forward rotation and the reverse rotation as viewed from the width direction. is there. In the relative rotation range, the range in which the plate contact surfaces 144 overlap is such that the lubricating oil present in the space S can flow into the inter-regulator clearance C2 when the volume of the inter-regulator clearance C2 increases. It may be within a certain predetermined range. The predetermined range may be a partial range of the relative rotation range, but in the illustrated example, is the entire range of the relative rotation range including the partial range.

With reference to FIG. 2 to FIG. 4, a state when the traveling chain 100 is wound around the sprocket 10 will be described.
Referring to FIGS. 2 and 3, in the free span portion 100 a in a straight state, both the restricting portions 133 and 153 are in contact with each other on the contact surfaces 144 and 164 in each second pin hole 131, and the plate The restricting portion 133 is prevented from rotating in the reverse bending direction with respect to the pin restricting portion 153. For this reason, it is prevented that the guide row | line | column 101 and the non-guide row | line | column 103 will be in the state of a reverse bending relatively, and the reverse bending amount is controlled to zero.

  When the inner plate 130A of the non-guide row 103 starts to bend with respect to the guide row 101 among the guide row 101 and the non-guide row 103 in the linear state, as shown in FIG. In the second pin hole 131A (FIG. 4 (b)) forward in the running direction at 101, the plate restricting portion 133 rotates in the forward bending direction within the rotation clearance C1, and at the same time, both contact surfaces 144, 164 ( 3) is separated in the rotational direction, and the inner plate 130A starts to wind around the sprocket 10. At this time, both the contact surfaces 144 and 164 are in contact with each other in the second pin hole 131B (FIG. 4C) rearward in the traveling direction in the guide row 101.

Thereafter, as shown in FIG. 4D and FIG. 4G, the chain 100 is sequentially bent in the forward bending direction, the guide row 101 is bent in the forward bending direction, and the second pin hole 131B. (FIG. 4 (i)), both contact surfaces 144, 164 are separated in the rotational direction, and then the non-guide row 103 that has started forward bending from the straight state reaches the maximum bent state, and the non-guide row 103 The forward bending is completed.
Further, when the chain 100 is disengaged from the sprocket 10, the plate restricting portion 133 is rotated in the reverse bending direction within the rotation clearance C <b> 1 relative to the pin restricting portion 153, and both contact surfaces 144, 164 are located. Come into contact with each other, and the guide row 101 and the non-guide row 103 adjacent in the longitudinal direction are in a straight line state.

Next, operations and effects of the embodiment configured as described above will be described.
A guide row 101 and a non-guide row 103 that are adjacent in the longitudinal direction are connected to be bent by a single pin 150 that is inserted into the second pin hole 131 of the inner plate 130 of the non-guide row 103 so as to be rotatable in the rotational direction. The chain 100 is wound around a plurality of sprockets 10. As a result, the chain 100 has a plurality of guide rows 101 and a plurality of non-guide rows 103 alternately connected to each other in the longitudinal direction by a single pin 150 so as to be bent, and is wound around the plurality of sprockets 10. And run.

Then, when the plate restricting portion 133 of the inner plate 130 and the pin restricting portion 153 of the pin 150 abut on each other in the rotation direction, the guide row 101 and the non-guide row 103 are reversely bent so as to bend from the straight state to the reverse bending direction. The amount of reverse bending is regulated.
As a result, the plate restricting portion 133 and the pin restricting portion 153 that are in contact with each other restrict the amount of reverse bending of the guide row 101 and the non-guide row 103, so that the occurrence of string vibration is suppressed, resulting from the string vibration. Noise can be reduced. Then, since the regulation of the reverse bending amount is performed by the contact of the plate restricting portion 133 and the pin restricting portion 153 that rotate relative to each other in the turning direction, the reverse bending amount is restricted by the use of the frictional force. Compared to, the friction loss in the chain 100 due to the restriction of the reverse bending amount can be reduced, and the wear of the chain component parts due to the restriction of the reverse bending amount is reduced, so the durability of the chain 100 is improved. Can be made.

In addition, the plate restricting portion 133 and the pin restricting portion 153 are provided using the inner plate 130 and the pin 150 that is rotatably inserted into the second pin hole 131 of the inner plate 130, respectively. The degree of freedom in selecting the position in the rotational direction where the restricting portions 133 and 153 are provided for the pin 150 is increased. For this reason, the freedom degree of arrangement | positioning of both the control parts 133,153 in a rotation direction becomes large, and the freedom degree of design of the chain 100 which has a reverse bending control function can be enlarged.
Further, since only one pin 150 is inserted into the second pin hole 131, the second pin hole 131 can be reduced in diameter, so that the chain pitch is reduced and the reverse bending restricting function is provided. The size reduction of the chain 100 can be facilitated, and the number of pins 150 and the number of assembly steps can be reduced, so that the cost of the chain 100 can be reduced.

The second hole peripheral wall 132 forming the second pin hole 131 of the inner plate 130 has a second hole peripheral wall surface 142 that defines the contour of the second pin hole 131, and the outer peripheral portion 152 of the pin 150 is The pin 150 has an outer peripheral surface 162 that defines the outer periphery of the pin 150, the plate restricting portion 133 has a plate contact surface 144 that is a part of the second hole peripheral wall surface 142, and the pin restricting portion 153 has an outer peripheral surface 162. The pin abutting surface 164 is a part of the plate abutting surface 164, and the plate abutting surface 144 and the pin abutting surface 164 are in contact with each other, so that the reverse bending amount is regulated.
Accordingly, since the plate restricting portion 133 and the pin restricting portion 153 are located in the second pin hole 131, the restricting portions 133 and 153 are outside the second pin hole 131, for example, the outer peripheral surface and the width of the plate in the inner plate 130. Compared to the case where the inner plate 130 is provided on the side surface of the plate facing in the direction, the inner plate 130 can be downsized, and the downsizing and weight reduction of the chain 100 having the reverse bending restricting function can be facilitated.

The second hole peripheral wall surface 142 has a plate arc surface 145 centered on the second pin hole center line L2, and the outer peripheral surface 162 has a pin arc surface 165 centered on the pin center line L0. The surface 145 and the pin arc surface 165 are in sliding contact with each other when the guide row 101 and the non-guide row 103 rotate relatively around the pin center line L0 in the forward bending direction and the reverse bending direction. The cross-sectional shape of the arc surface 165 is an arc of a plate virtual circle 149 centered on the second pin hole center line L2 and a pin virtual circle 169 centered on the pin center line L0. The entire hole peripheral wall surface 142 and the entire outer peripheral surface 162 are located within the plate virtual circle 149.
As a result, the second pin hole 131 has a size that fits within the plate virtual circle 149 defined by the radius of the plate arcuate surface 145 required for relative rotation between the inner plate 130 and the pin 150, so that the plate restricting portion 133 or a part of the peripheral wall surface 142 of the second hole is located outside the virtual plate circle 149, the second pin hole 131 is smaller, so that the strength of the inner plate 130 is improved and the durability of the inner plate 130 is improved. Property, and thus durability of the chain 100 can be improved.
In addition, since the plate restricting portion 133 comes into contact with the pin restricting portion 153 in the second pin hole 131 in the rotational direction, the plate restricting portion 133 is positioned radially inward from the plate arcuate surface 145. The strength of the inner plate 130 can be improved by the restricting portion 133.

The outer peripheral surface 162 has a pin connection surface 166 that forms a rotation clearance C1 that allows relative rotation of the plate restricting portion 133 with the second hole peripheral wall surface 142, and the pin restricting portion 153 has a pin connection. Projecting to the surface 166.
Thus, the strength of the pin 150 can be improved by utilizing the pin restricting portion 153 as much as the pin restricting portion 153 protrudes from the pin connection surface 166. Durability can be improved.

The pin 150 is inserted into the first pin hole 121 of the middle plate 120 so as to form a space S between the outer peripheral surface 162 and the space S when viewed from the width direction. At a position overlapping the plate contact surface 144.
As a result, the lubricating oil that has flowed into the space S after entering the gap in the width direction between the inner plate 130 and the middle plate 120 has the second pin hole of the inner plate 130 when both the contact surfaces 144 and 164 are separated. In 131, it flows into the clearance C2 between regulation parts formed between both bending regulation parts, and can be supplied to both contact surfaces 144, 164. Therefore, both contact surfaces 144, 144 are lubricated by the lubricating oil supplied from the space S. The wear at 164 is reduced, and the durability of the silent chain 100 can be improved.
Further, when both restricting portions 133 and 153 approach each other in the rotation direction, they adhere to both contact surfaces 144 and 164 due to resistance for discharging the lubricating oil flowing into the clearance C2 between the restricting portions. Since the impact of the contact surfaces 144 and 164 is alleviated by the oil film, the impact noise caused by the contact is reduced, and the quiet performance of the chain 100 can be improved.

  Since the plate restricting portion 133 is located at the position where it intersects with the pitch surface Pp on the center side of the second pin hole 131, the plate restricting portion 133 that restricts reverse bending is used, and the pitch surface Pp and the second hole are caused by chain tension. Since the tensile stress generated at the intersection with the peripheral wall 132 can be reduced, the fatigue strength of the inner plate 130 can be improved. In addition, since stress concentration is likely to occur at the circumferential end portions 133a and 133b of the plate restricting portion 133 due to the chain tension, the portion near the central plane P3 where the stress concentration is likely to occur (that is, the crotch portion) Since the stress generated near the center in the longitudinal direction of the second hole peripheral wall 132 in the vicinity of the second hole peripheral wall surface 142 is dispersed, the fatigue strength of the inner plate 130 can also be improved in this respect.

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.
As an example of the case where the plate restricting portion 133 and the pin restricting portion 153 are provided in the circumferential position (or rotational position) other than the above-described embodiment in the second hole peripheral wall 132 and the outer peripheral portion 152, respectively, FIG. As shown by a two-dot chain line, the plate restricting portion 133 is provided in a portion where the distance between the outer flank or the inner flank and the plate virtual circle 149 is the smallest in the cross section (in FIG. 2, as an example, the inner flank 138a and the plate virtual circle 149 (FIG. 3) are provided with a plate restricting portion 133 provided at a portion where the distance is the minimum, and a crosspiece width (crosspiece width W in FIG. 2). Therefore, the strength of the inner plate 130 can be improved.
As another example, the plate restricting portion 133 may be provided in the second hole peripheral wall 132 at a site where tensile stress due to chain tension is generated.

The plate restricting portion 133 may be provided on a plate side surface (for example, a recess in the width direction of the second hole surrounding wall 132) regardless of the second hole surrounding wall surface 142. In this case, the pin restricting portion 153 is , Provided outside the second pin hole 131.
The restricting portion wall surface 143 may be a convex surface (or concave surface), and the restricting portion outer surface 163 may be a concave surface (or convex surface).
The plate restricting portion 133 may be located on the opposite side of the second hole peripheral wall 132 portion. In this case, for example, both contact surfaces 144 and 164 are located on the bending side, and the rotation clearance C1 is located on the anti-bending side.
When the cross-sectional shape of the plate arc surface 145 or the pin arc surface 165 is a plurality of arcs divided into two or more in the circumferential direction, the plurality of arcs corresponds to the circumferential length of the above-mentioned dominant arc. It may have a circumferential length.
A part of the second hole peripheral wall surface 142, for example, the restriction portion wall surface 143 or the plate connection surface 146 may be located outside the plate virtual circle 149. Further, a part of the outer peripheral surface 162, for example, the regulating portion outer surface 163 or the pin connection surface 166 may be located outside the pin virtual circle 169 or the plate virtual circle 149.
The pin connection surface 166 may always be in non-contact with the plate restricting portion 133 in the forward rotation process and the reverse rotation process.
On the premise that string vibration is suppressed, the reverse bending amount set by the contact of both contact surfaces 144 and 164 may be a value other than zero.
In the chain, the first link has a pair of outer plates as a pair of holding plates, the second link has a pair of inner plates, and the pins are circular between the pair of inner plates. A roller chain having a cross-sectional shape and rotatably supporting the roller may be used.

DESCRIPTION OF SYMBOLS 10 ... Sprocket 11 ... Sprocket tooth 100 ... Silent chain 100a ... Free span part 101 ... Guide row 103 ... Non-guide row 110 ... Guide plate 111 ... Holding hole 112 ... hole peripheral wall 120 ... middle plate 121 ... first pin hole 122 ... first hole peripheral wall 123 ... first hole peripheral wall surface 124 ... contact surface 125 ... non-contact surface 128 ... tooth part 130, 130A ... inner plate 131, 131A, 131B ... second pin hole 132 ... second hole peripheral wall 133 ... plate reverse bending restricting part 133a, 133b ... circumferential direction End 135... Plate arc portion 136... Plate connection portion 138... Tooth portion 138 a .. Inner flank 142. ... plate contact surface 145 ... plate arc surface 146 ... plate connection surface 149 ... plate virtual circle 150 ... pin 152 ... outer peripheral portion 153 ... pin reverse bending restricting portion 155 ··· Pin arc portion 156 ··· Pin connecting portion 162 ··· Outer peripheral surface 163 ··· Regulator outer surface 164 ··· Pin contact surface 165 ··· Pin arc surface 166 ··· Pin connecting surface 169 ··· · Pin virtual circle B ··· Reverse bending restricting portion C1 ··· Clearance for rotation C2 ··· Clearance between restricting portions L0 ··· Pin center line L1 ··· First pin hole center line L2 ··· Second Pin hole center line P1, P2, P3 ... center plane Pp ... pitch plane S ... space W ... crosspiece width

Claims (5)

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, which are adjacent to each other in the longitudinal direction, are inserted into the pin holes of the inner plate so as to be rotatable in the rotation direction and the pair of pairs. In a chain that can be bent by a single pin that is held on a holding plate in a state in which the rotation is restricted, and can run around one or more sprockets,
The inner plate has a plate reverse bending restricting portion provided on at least one of the opposing side of the two pin holes of the inner plate ;
A pin that fits into a pin hole provided with the plate reverse bending restricting portion has a pin reverse bending restricting portion that can come into contact with the plate reverse bending restricting portion,
When the plate reverse bend restricting portion and the pin reverse bend restricting portion are in contact with each other in the rotational direction, the first link and the second link are wound around the sprocket from a linear state in which the first link and the second link are linearly connected in the longitudinal direction. The chain is characterized in that the reverse bending amount of the reverse bending that is bent from the linear state in the reverse bending direction opposite to the forward bending direction is regulated. The chain according to claim 1,
In the inner plate, a hole peripheral wall forming a pin hole provided with the plate reverse bending restricting portion has the hole peripheral wall surface defining the outline of the pin hole,
The outer peripheral portion of the pin that fits into the pin hole provided with the plate reverse bending restricting portion has an outer peripheral surface that defines the outer contour of the pin,
The plate reverse bending restricting portion has a plate contact surface that is a part of the peripheral wall surface of the hole,
The pin reverse bending restricting portion has a pin contact surface that is a part of the outer peripheral surface,
The chain is characterized in that the reverse bending amount is regulated by the plate contact surface and the pin contact surface contacting each other. The chain according to claim 2,
The peripheral wall surface of the hole has a plate arc surface centered on a pin hole center line of the pin hole provided with the plate reverse bending restricting portion ,
The outer peripheral surface of the pin that fits into the pin hole provided with the plate reverse bending restricting portion has a pin arc surface centered on the pin center line of the pin,
The plate arc surface and the pin arc surface are in sliding contact when the first link and the second link rotate around the pin center line relatively in the forward bending direction and the reverse bending direction,
Cross sectional shapes of the plate arc surface and the pin arc surface are respective arcs of a plate virtual circle centered on the pin hole center line and a pin virtual circle centered on the pin center line,
In the cross section, the entire circumferential wall surface of the hole is located within the plate virtual circle. The chain according to claim 2 or claim 3, wherein
An outer peripheral surface of a pin that fits into a pin hole provided with the plate reverse bending restricting portion forms a rotation clearance that allows relative rotation of the plate reverse bending restricting portion with the peripheral wall surface of the hole. Having a pin clearance forming surface,
The chain, wherein the pin reverse bending restricting portion protrudes with respect to the pin clearance forming surface. The chain according to any one of claims 2 to 4, wherein the chain is a silent chain arranged in a lubricating oil atmosphere,
The holding plate is a guide plate;
The first link has one or more middle plates disposed adjacent to the inner plate in the width direction between the pair of guide plates,
A pin that fits into the pin hole provided with the plate reverse bending restricting portion is inserted into the pin hole of the middle plate so as to form a space between the outer peripheral surface of the pin ,
The chain, wherein the space is located at a position overlapping the plate contact surface in a relative rotation range of the plate reverse bending restricting portion when viewed in the width direction.

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