JP2004162917A - Silent chain and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce noises of a silent chain and also to improve sound vibration performance. <P>SOLUTION: A large number of link plates 2 having a pair of teeth 22 and pin holes 21 are laminated in the thickness direction and in the longitudinal direction. And at the same time, guide links 4, 4' are arranged on the outer-most side of the link plate 2. The silent chain 1 is composed by connecting them with connection pins 3. The yield load of the guide link 4 is made smaller than that of the guide link 4'. The guide links 4, 4' are irregularly mixed in the longitudinal direction of the chain. By this, a contact state with inner side is changed non-periodically at the starting time of the engagement with a sprocket tooth. And at the same time, when seating is executed with outer side as the engagement is shifted from the inner side to the outer side, a seating state with the sprocket tooth of the outer side is changed non-periodically. As a result, sound pressure from the starting time of the engagement to the seating time can be reduced and the sound vibration performance can be improved. <P>COPYRIGHT: (C)2004,JPO

Description

  The present invention relates to a silent chain formed by stacking a number of link plates having a pair of tooth portions and pin holes in a thickness direction and a longitudinal direction and connecting the link plates by connecting pins, and particularly to a silent chain having improved sound vibration performance. .

  2. Description of the Related Art Silent chains have been used as power transmission chains for automobiles and motorcycles. Generally, a silent chain is configured by connecting a number of link plates each having a pair of teeth and a pin hole with a connecting pin inserted into each pin hole.

  In such a silent chain, a pitch sound generated at the time of engagement with a sprocket contributes to noise, and a so-called random chain has been put to practical use in order to reduce such a pitch sound.

  The random chain is configured by combining two types of link plates as shown in FIGS. The link plate 100 shown in FIG. 9 is a standard link plate, and has a pair of pin holes 101 and tooth portions 102. Each tooth portion 102 has an inner flank face (inner thigh) 103 and an outer flank 103, respectively. The surface (outer crotch) 104 is formed.

  FIG. 10 shows a so-called random link 110. The random link 110 has the same pin hole 101 as the link plate 100, but the shape of each tooth 112 is different from the shape of each tooth 102 of the link plate 100. That is, the tooth portion 112 has an outer flank surface 104 having the same shape as the outer flank surface 104 of the link plate 100 and an inner flank formed from a convex curved surface protruding inward from the inner flank surface 103 of the link plate 100. And a surface 113. Note that the alternate long and short dash line in FIG. 10 indicates the outline of the inner flank surface 103 of the link plate 100.

  In this case, a random chain is formed by configuring a plurality of randomly selected link rows or guide rows from random links 110 and configuring the remaining link rows or guide rows from link plates 100.

  During the operation of the random chain, when the inner flank engages with the sprocket teeth, whether the link row or guide row including the inner flank is formed of the standard link plate 100 or the random link 110 As a result, the meshing state with the sprocket teeth is changed, whereby the pitch sound which has been conventionally periodic is reduced, and the noise is reduced.

  However, the conventional random chain has a main purpose of reducing noise at the beginning of meshing with a sprocket, and is sufficient for noise reduction from the middle of meshing to the end of meshing (at the time of sitting). Absent.

  The problem to be solved by the present invention is to provide a silent chain that can reduce noise from the start of meshing to the time of sitting and can improve sound vibration performance.

  By the way, in recent silent chains, a prestress load is generally applied after the chain is assembled. The pre-stress load is a tensile load applied to the entire silent chain so that a load greater than the yield load of the link plate constituting the silent chain acts on the link plate. By the prestress operation in which such a prestress load is applied, the pitch of the link plate undergoes plastic elongation and becomes a new pitch.

  The present invention intends to improve the sound vibration performance of the silent chain by using such a prestress load.

  The silent chain according to the first aspect of the present invention is a silent chain in which a number of link plates having a pair of tooth portions and pin holes are stacked in a thickness direction and a longitudinal direction and connected by a connecting pin, and yield loads are different from each other. It is characterized in that at least two types of guide links are mixed irregularly in the longitudinal direction of the chain.

  A silent chain according to a second aspect of the present invention is a silent chain in which a number of link plates having a pair of tooth portions and pin holes are stacked in a thickness direction and a longitudinal direction and connected by connecting pins, and yield loads are different from each other. At least two types of link plates are mixed irregularly in the longitudinal direction of the chain.

  A silent chain according to a third aspect of the present invention is characterized in that, in the first aspect, at least two types of link plates having different yield loads are mixed irregularly in the longitudinal direction of the chain.

  According to the first aspect of the invention, at least two types of guide links having different yield loads are mixed irregularly in the longitudinal direction of the chain. Here, the term “yield load” as used herein means a tensile load at which plastic deformation starts to occur. In this case, after the pre-stress operation, the plastic elongation of the pitch of each guide link, and thus the plastic elongation of the pitch of the link plates in the guide row including the respective guide links, differs depending on which guide link includes the guide row. .

  That is, in the guide link having a relatively small yield load, the plastic elongation of the pitch becomes relatively large, and as a result, the plastic elongation of the pitch of the link plates in the guide row including the guide link also becomes large, and (That is, the distance between the outer flank surfaces (or the inner flank surfaces) on the mesh pitch line) increases. Conversely, in a guide link having a relatively large yield load, the plastic extension of the pitch is relatively small, and as a result, the plastic extension of the pitch of the link plates in the guide row including the guide link is also small. Thus, the mesh pitch of the link plates is reduced. As a result, after the prestress operation, guide rows having different engagement pitches are arranged irregularly in the longitudinal direction of the chain.

  Therefore, for example, in the case of a chain in which the inner crotch meshes and the outer crotch is seated (that is, a chain in which the sprocket teeth mesh with the inner flank surface at the start of meshing and mesh with the sprocket teeth and the outer flank surface at the time of seating), the link plate of the link plate is started at the start of meshing. When the meshing state of the inner flank with the sprocket teeth changes aperiodically, the meshing point shifts from the inner flank to the outer flank, and when the outer flank sits on the sprocket teeth, the outer flank faces The seating state with the sprocket teeth also changes aperiodically. Accordingly, noise from the start of meshing to the time of sitting can be reduced, and sound vibration performance can be improved.

  In the invention of claim 2, at least two types of link plates having different yield loads are mixed irregularly in the chain longitudinal direction. In this case, after the pre-stress operation, the plastic elongation of the pitch of each link plate, that is, the plastic elongation of the pitch of each link row composed of each link plate differs depending on the link row.

  That is, in a link plate having a relatively small yield load, the plastic elongation of the pitch is relatively large, and as a result, the plastic elongation of the pitch of the entire link row including the link plate is also large, and the The mesh pitch of the link plates increases. Conversely, in a link plate having a relatively large yield load, the plastic elongation of the pitch is relatively small, and as a result, the plastic elongation of the pitch of the entire link row including the link plate is also small. The mesh pitch of the link plates in the link row is reduced. As a result, after the prestress operation, the link rows having different engagement pitches are irregularly arranged in the longitudinal direction of the chain.

  Therefore, as in the case of the first aspect of the invention, for example, in the case of a chain with an inner crotch mesh and an outer crotch seat, the engagement state of the inner flanks of the link plate with the sprocket teeth at the start of meshing changes aperiodically. At the same time, when the meshing point shifts from the inner flank surface to the outer flank surface and the outer flank surface is seated on the sprocket teeth, the seating state of the outer flank surface with the sprocket teeth changes aperiodically. Accordingly, noise from the start of meshing to the time of sitting can be reduced, and sound vibration performance can be improved.

  According to the third aspect of the present invention, at least two types of link plates having different yield loads are irregularly mixed in the longitudinal direction of the chain in the first aspect. The link rows will be irregularly arranged in the longitudinal direction of the chain. As a result, during operation of the silent chain, the meshing state at the start of meshing with the sprocket teeth and the seating state at the time of sitting with the sprocket teeth change aperiodically, and as a result, from the start of meshing to the time of sitting. Noise can be reduced and sound and vibration performance can be improved.

  In the invention of claim 4, the yield load of each guide link is lower than the yield load of each link plate.

  According to the fifth aspect of the present invention, the yield load of each guide link is different because each of the guide links has a different plate thickness, hardness, material, or planar shape.

  In this case, if the thickness, material or planar shape of each guide link is different, the rigidity of each guide link is also different from each other. In this case, during the actual operation of the silent chain, when each guide link is elastically deformed by the tension acting on the silent chain, the amount of elastic deformation differs depending on the guide link. Different guide links will be randomly arranged in the longitudinal direction of the chain. As a result, during operation of the silent chain, the meshing state at the start of meshing with the sprocket teeth and the seating state at the time of sitting with the sprocket teeth change aperiodically, and as a result, from the start of meshing to the time of sitting. Noise can be reduced and sound and vibration performance can be improved.

  In the invention according to claim 6, the yield load of each link plate is different because each of the link plates has a different thickness, hardness, material, or planar shape.

  In this case, if the plate thickness, material, or planar shape of each link plate is changed, the rigidity of each link plate also differs. In this case, during the actual operation of the silent chain, when each link plate is elastically deformed by the tension acting on the silent chain, the amount of elastic deformation differs depending on the link plate. The different link plates will be randomly arranged in the longitudinal direction of the chain. As a result, during operation of the silent chain, the meshing state at the start of meshing with the sprocket teeth and the seating state at the time of sitting with the sprocket teeth change aperiodically, and as a result, from the start of meshing to the time of sitting. Noise can be reduced and sound and vibration performance can be improved.

  In the invention of claim 7, each guide link is constituted by a plurality of laminated plates, and the thickness of each guide link is different from each other due to the difference in the number of laminated plates.

  In this case, for example, a guide link with two or more thicknesses can be configured simply by preparing a plate of one thickness, so only one type of press die for punching the guide link is prepared. And the manufacturing cost can be reduced.

  In the invention according to claim 8, each link plate is composed of a plurality of laminated plates, and the thickness of each link plate is different from each other due to the difference in the number of laminated plates.

  In this case, it is possible to form link plates of two or more thicknesses, for example, by preparing only one type of plate, so only one type of press die for punching link plates is prepared. And the manufacturing cost can be reduced.

  In the ninth aspect of the present invention, the planar shapes of the guide links are different from each other due to the presence or absence of the crotch, the difference in the depth of the crotch, the presence or absence of the opening, or the difference in the size of the opening.

  In the tenth aspect of the present invention, the planar shapes of the link plates are different from each other due to the difference in crotch depth.

  According to the eleventh aspect of the invention, two types of link plates having mutually different protrusion amounts of the inner flank face are mixed irregularly in the longitudinal direction of the chain.

  In this case, when the inner flank surface of the link plate of the chain meshes with the sprocket, the meshing state of the inner flank surface with the sprocket teeth changes aperiodically. Thereby, noise at the start of meshing can be further reduced, and the sound vibration performance can be further improved.

A twelfth aspect of the present invention is a silent chain manufacturing method, which comprises the following steps. A) By laminating a number of link plates having a pair of teeth and pin holes in the thickness direction and the longitudinal direction, a plurality of link rows are formed in the chain longitudinal direction,
b) A first guide link having a first yield load and a first link including a link row having at least a first yield load by mixing at least two types of guide links having different yield loads with each other at random in the chain longitudinal direction with respect to the link row. And a second guide row including a second guide link and a link row having a second yield load different from the first yield load are arranged irregularly in the longitudinal direction of the chain.
c) connecting the link plate and the first and second guide links with a connecting pin,
d) applying a pre-stress load to the silent chain after assembling the silent chain such that a load greater than the first and second yield loads acts on the first guide link and the second guide link, respectively. The mesh pitches of the first guide row and the second guide row after removing the stress load are arranged irregularly in the chain longitudinal direction.

  According to the twelfth aspect of the present invention, after the prestress operation, the plastic elongation of the pitch of the first and second guide links, and thus the link plates in the first and second guide rows including the respective guide links, respectively. The plastic elongation of the pitch differs depending on which guide row includes the guide link. As a result, after the prestress operation, guide rows having different engagement pitches are arranged irregularly in the longitudinal direction of the chain.

  Therefore, during operation of the chain, the meshing state of the inner flank surface and the outer flank surface of the link plate with the sprocket teeth changes aperiodically. Accordingly, noise from the start of meshing to the time of sitting can be reduced, and sound vibration performance can be improved.

A thirteenth aspect of the present invention is a silent chain manufacturing method, which comprises the following steps. A) By laminating at least two types of link plates having a pair of tooth portions and pin holes and having different yield loads in the thickness direction and the longitudinal direction, a first link plate having a first yield load can be obtained. A first link row and a second link row consisting of a second link plate having a second yield load different from the first yield load are arranged irregularly in the longitudinal direction of the chain. With a connecting pin,
b) pre-stressing the silent chain after assembly of the silent chain such that a load greater than the first and second yield loads acts on the first link plate and the second link plate, respectively; The meshing pitch of the first link row and the second link row after the removal of the stress load is arranged irregularly in the longitudinal direction of the chain.

  According to the thirteenth aspect, after the pre-stress operation, the plastic elongation of the pitch of the first and second link plates, and thus the links in the first and second link rows respectively constituted by the respective link plates. The plastic elongation of the plate pitch differs depending on which link row consists of the link plates. As a result, after the prestress operation, the link rows having different engagement pitches are irregularly arranged in the longitudinal direction of the chain.

  Therefore, during operation of the chain, the meshing state of the inner flank surface and the outer flank surface of the link plate with the sprocket teeth changes aperiodically. Accordingly, noise from the start of meshing to the time of sitting can be reduced, and sound vibration performance can be improved.

  ADVANTAGE OF THE INVENTION According to the silent chain which concerns on this invention, the noise from the start of meshing to the time of sitting can be reduced, and there exists an effect which can improve sound-vibration performance.

<Example 1>
1 to 4 are views for explaining a silent chain according to a first embodiment of the present invention. FIG. 1 is a partial plan view of the silent chain, FIG. 2 is a front partial view of the silent chain, and FIG. FIG. 4 is an enlarged front view of the first guide link, and FIG. 4 is an enlarged front view of the second guide link.

  As shown in FIGS. 1 and 2, this silent chain 1 has a large number of link plates 2 stacked in a thickness direction (vertical direction in FIG. 1) and a longitudinal direction (horizontal direction in FIG. 1), and these link plates 2 are connected. It is configured by connecting with a pin 3 and arranging guide links 4, 4 'on the outermost side.

  The silent chain 1 is arranged at the same longitudinal position as the guide link 4 and a plurality of guide rows 5 composed of the link plate 2 and the guide link 4 arranged at the same longitudinal position as the guide link 4. It has a plurality of guide rows 5 ′ constituted by the link plates 2 and the guide links 4 ′, and a plurality of link rows 6 arranged between adjacent guide rows and constituted solely by the link plates 2. ing. The guide rows 5, 5 'and the link rows 6 are alternately arranged in the longitudinal direction. The guide links 4 and 4 'are mixed irregularly in the longitudinal direction of the chain.

  The link plate 2 has a pair of pin holes 21 and teeth 22. The connection pin 3 is inserted into each pin hole 21. Each tooth portion 22 includes an inner flank surface 22a and an outer flank surface 22b that mesh with sprocket teeth (not shown).

As shown in FIG. 3, the first guide link 4 has a pair of pin holes 41 and a crotch portion (crotch portion) 43. The end of the connecting pin 3 is inserted and fixed in each pin hole 41. The crotch portion 43 preferably has an arc-shaped bottom portion, which extends beyond the upper end edge of the opening of each pin hole 41 to the vicinity of the pin hole center line. The distance from the upper end of the bottom and the guide link 4 of the crotch portion 43 in this case and d _1.

On the other hand, as shown in FIG. 4, the second guide link 4 'has a pair of pin holes 41' and a crotch portion 43 '. Similarly, the end of the connecting pin 3 is inserted and fixed in each pin hole 41 '. The crotch 43 'preferably has an arcuate bottom, which extends to near the upper edge of the opening of each pin hole 41'. 'When, d _1' the distance from the upper end of the crotch portion 43 when 'bottom and the guide link 4' d ₁ has a <d _1.

  Therefore, in this case, the yield load of the guide link 4 when a tensile force acts on the silent chain 1 is smaller than the yield load of the guide link 4 '.

  Thereby, during the pre-stress operation after the chain is assembled, a pre-stress load such that a tensile load larger than the yield load of each of the guide links 4, 4 'acts on each of the guide links 4, 4' is applied to the silent chain 1. When operated, after the prestress operation, the plastic elongation of the pitch of the guide link 4 becomes larger than the plastic elongation of the pitch of the guide link 4 ′, and the pitch of the link plate 2 in the guide row 5 including the guide link 4 is reduced. The plastic elongation is greater than the plastic elongation of the pitch of the link plates 2 in the guide row 5 including the guide links 4 '.

  As a result, the mesh pitch of the link plates 2 in the guide row 5 including the guide links 4 (that is, the distance between the outer flank surfaces 22b of the link plates 2 on the mesh pitch line (and the distance between the inner flank surfaces 22a)) is determined. Is larger than the mesh pitch of the link plates 2 in the guide row 5 'including the guide links 4'. In this way, after the prestress operation, the guide rows 5, 5 'having different engagement pitches are irregularly arranged in the longitudinal direction of the chain.

  In this case, for example, in the case of an inner-crop meshing / outer-crop seating chain, at the start of meshing, the meshing state of the inner flank surface 22a of the link plate 2 with the sprocket teeth changes aperiodically, and the meshing point changes to the inner flank surface 22a. When the outer flank surface 22b is seated on the sprocket teeth, the seating state of the outer flank surface 22b with the sprocket teeth also changes aperiodically. Accordingly, noise from the start of meshing to the time of sitting can be reduced, and sound vibration performance can be improved.

<Example 2>
5 and 6 are views for explaining a silent chain according to a second embodiment of the present invention. FIG. 5 is a partial plan view of the silent chain, and FIG. 6 is a partial front view of the silent chain. In these figures, the same reference numerals as those in the first embodiment denote the same or corresponding parts.

  As shown in FIGS. 5 and 6, the silent chain 10 includes a plurality of guide rows 5, 5 'and a plurality of link rows 6 arranged between the guide rows, as in the first embodiment. Are alternately arranged in the longitudinal direction, and the guide rows 5, 5 'are irregularly mixed in the longitudinal direction of the chain. The link plate 2 has a pair of pins into which the connecting pins 3 are inserted. It has a hole 21 and tooth portions 22 each formed of inner and outer flank surfaces 22a and 22b.

  The guide link 4 is configured by stacking a plurality of thin plates 4A. In the example of FIG. 5, each of the guide links 4 of the guide row 5 is constituted by overlapping two plates 4A, and each of the guide links 4 of the guide row 5 'is stacked with three plates 4B. It is constituted by. Therefore, when a plate having a thickness of, for example, 0.3 mm is used as the plate 4A, the thickness of each guide link 4 in the guide row 5 is 0.6 mm, and the thickness of each guide link 4 in the guide row 5 'is 0. 0.9 mm. Further, as the planar shape of each plate 4A, for example, the same shape as the guide link 4 shown in FIG. 3 of the first embodiment is adopted.

  In this case, the yield load of the guide link 4 of the guide row 5 is smaller than the yield load of the guide link 4 of the guide row 5 '.

  Thereby, during the pre-stress operation after the chain assembly, a pre-stress load such that a tensile load larger than the yield load of each guide link 4 of the guide rows 5 and 5 ′ acts on each guide link 4 is applied to the silent chain 1. When actuated, after the prestress operation, the plastic elongation of the pitch of the guide links 4 in the guide row 5 becomes larger than the plastic elongation of the pitch of the guide links 4 in the guide row 5 ′, and the link plates 2 in the guide row 5. Is greater than the pitch of the link plates 2 in the guide row 5 '.

  As a result, the mesh pitch of the link plates 2 in the guide row 5 is larger than the mesh pitch of the link plates 2 in the guide row 5 '. In this way, after the prestress operation, the guide rows 5, 5 'having different engagement pitches are irregularly arranged in the longitudinal direction of the chain.

  In this case, as in the first embodiment, during the operation of the silent chain, when the meshing with the sprocket teeth starts, the meshing state of the inner flank surface 22a of the link plate 2 with the sprocket teeth is aperiodic. When the outer flank surface 22b is seated on the sprocket teeth, the seating state of the outer flank surface 22b with the sprocket teeth is also non-periodic when the engagement point shifts from the inner flank surface 22a to the outer flank surface 22b. Change. Accordingly, noise from the start of meshing to the time of sitting can be reduced, and sound vibration performance can be improved.

<Example 3>
In the first and second embodiments, the example in which the yield load of the guide link is made to be irregularly different in the longitudinal direction of the chain has been described. However, the application of the present invention is not limited to this. The yield load may be varied irregularly in the longitudinal direction of the chain.

  7 and 8 show first and second link plates constituting a silent chain according to a third embodiment of the present invention, respectively. In these figures, the same reference numerals as those in the first and second embodiments denote the same or corresponding parts.

As shown in FIG. 7, the first link plate 2 has the same configuration as the link plate 2 in the first embodiment, and the upper portion of the crotch portion 23 has the lower end of the opening of each pin hole 21. It extends to a position near or beyond the edge. Here, the distance from the lower end of the tooth portion 22 above the crotch portion 23 is d ₂ .

As shown in FIG. 8, the second link plate 2 ′ has substantially the same configuration as the first link plate 2, but the position above the crotch portion 23 ′ is different from that of the first link plate 2. Is different. That is, in FIG. 8, 'When, d _2' the distance from the 'top of the teeth 22 of the' lower crotch portion 23 d ₂ has a <d _2.

  Therefore, in this case, the yield load of the link plate 2 when a tensile force acts on the silent chain 1 is smaller than the yield load of the link plate 2 '.

  Thus, during the pre-stress operation after the assembly of the chain, a pre-stress load is applied to the silent chain 1 such that a load greater than the yield load of each of the link plates 2, 2 'acts on each of the link plates 2, 2'. Then, after the prestress operation, the plastic extension of the pitch of the link plate 2 becomes larger than the plastic extension of the pitch of the link plate 2 '. As a result, the mesh pitch of the link row composed of the link plates 2 is larger than the mesh pitch of the link row composed of the link plates 2 '.

  Therefore, after the prestress operation, the link rows having different engagement pitches are irregularly arranged in the chain longitudinal direction.

  In this case, for example, in the case of a chain with an inner crotch mesh and an outer crotch seat, at the start of meshing, the meshing state of the inner flank surface of the link plate with the sprocket teeth changes aperiodically, and the mesh point changes from the inner flank surface to the outer flank surface. When the outer flank faces the sprocket teeth, the seating state of the outer flank faces with the sprocket teeth changes aperiodically. Accordingly, noise from the start of meshing to the time of sitting can be reduced, and sound vibration performance can be improved.

<Other embodiments>
A) In the first to third embodiments, an example is shown in which two types of guide links or link plates having different yield loads are used, but the present invention uses three or more types of guide links or link plates. The same is applicable to the case.

B) In the first to third embodiments, the example in which the yield load of only the guide link or only the link plate is made different in the longitudinal direction of the chain is shown. However, the yield load of both the guide link and the link plate is reduced. Each may be different in the chain longitudinal direction.

C) As a guide link to which the present invention is applied, in addition to the combination shown in FIGS. 3 and 4 of the first embodiment, a guide link whose bottom portion of the crotch portion extends beyond the center line of the pin hole. The link may be combined with the guide link of FIG. 3 of the first embodiment. Further, a guide link without a crotch portion may be combined, or a guide link having a through hole formed at the center of the guide link may be combined.

    In addition, as a method of changing the yield load of the guide link, in addition to changing the planar shape in this way, changing the plate thickness as in the second embodiment, changing the material and heat treatment, May be changed.

    Furthermore, some of the differences in plate thickness, hardness, and plane shape may be appropriately combined, and thus, for example, the yield load of the guide link is set to about half of the yield load of the link plate. It is also possible.

D) As a method for changing the yield load of the link plate to which the present invention is applied, in addition to changing the planar shape as in the third embodiment, changing the plate thickness, the material, or changing the hardness. Is also good. As an example of changing the plate thickness, a plurality of thin plates may be stacked as in the case of the guide link in the second embodiment.

E) In addition to making the yield loads of the guide link and / or the link plate different as in the above embodiments, random links as shown in FIG. 10 are irregularly arranged in the longitudinal direction of the chain. They may be mixed. In this case, at the start of the engagement with the sprocket, the engagement state of the inner flank surface of the link plate with the sprocket teeth changes aperiodically, so that the noise at the start of the engagement can be further reduced and the sound vibration performance can be further improved. It can be improved.

1 is a partial plan view of a silent chain according to a first embodiment of the present invention. It is a front partial view of a silent chain (FIG. 1). It is a front enlarged view of the 1st guide link. It is a front enlarged view of a 2nd guide link. FIG. 4 is a partial plan view of a silent chain according to a second embodiment of the present invention. It is a front partial view of a silent chain (FIG. 5). It is a front enlarged view of the 1st link plate which constitutes a silent chain by a 3rd embodiment of the present invention. It is a front enlarged view of the 2nd link plate which constitutes the silent chain by a 3rd embodiment of the present invention. It is a front enlarged view of the standard link plate which comprises the conventional silent chain. It is a front enlarged view of a random link.

Explanation of reference numerals

1: Silent chain

2: Link plate 21: Pin hole 22: Tooth 22a: Inner flank 22b: Outer flank

2 ': Link plate 21': Pin hole 22 ': Tooth 22'a: Inner flank surface 22'b: Outer flank surface

3: Connecting pin

4: Guide link 41: Pin hole 43: Crotch

4 ': Guide link 41': Pin hole 43 ': Crotch

5,5 ': Guide row

6: Link column

Claims (13)

In a silent chain formed by stacking a number of link plates having a pair of tooth portions and pin holes in a thickness direction and a longitudinal direction and connecting them with connecting pins,
At least two types of guide links with different yield loads are mixed irregularly in the longitudinal direction of the chain,
A silent chain characterized by the following. In a silent chain formed by stacking a number of link plates having a pair of tooth portions and pin holes in a thickness direction and a longitudinal direction and connecting them with connecting pins,
At least two types of link plates with different yield loads are mixed irregularly in the longitudinal direction of the chain,
A silent chain characterized by the following. In claim 1,
At least two types of link plates with different yield loads are mixed irregularly in the longitudinal direction of the chain,
A silent chain characterized by the following. In claim 1 or 3,
The yield load of each of the guide links is lower than the yield load of each of the link plates,
A silent chain characterized by the following. In claim 1 or 4,
Each of the guide links having a different yield load is different from one another in plate thickness, hardness, material or planar shape,
A silent chain characterized by the following. In claim 2 or 3,
Each of the link plates having a different yield load is different from one another in plate thickness, hardness, material or planar shape,
A silent chain characterized by the following. In claim 5,
Each of the guide links is composed of a plurality of laminated plates, and the thickness of each of the guide links is different from each other due to a difference in the number of laminated plates of the laminated plates.
A silent chain characterized by the following. In claim 6,
Each of the link plates is constituted by a plurality of laminated plates, and the thickness of each of the link plates is different from each other due to a difference in the number of laminated plates of the laminated plates.
A silent chain characterized by the following. In claim 5,
The planar shape of each of the guide links is different from each other due to the presence or absence of a crotch, the difference in the depth of the crotch, the presence or absence of an opening, or the difference in the size of the opening.
A silent chain characterized by the following. In claim 6,
The planar shapes of the link plates are different from each other due to a difference in crotch depth,
A silent chain characterized by the following. In claim 1 or 2,
Two kinds of link plates with different protrusion amounts of the inner flank face are mixed irregularly in the chain longitudinal direction,
A silent chain characterized by the following. A method of manufacturing a silent chain,
By laminating a large number of link plates having a pair of teeth and pin holes in the thickness direction and the longitudinal direction, a plurality of link rows are formed in the chain longitudinal direction,
A first guide link having a first yield load and a first link row including the link row are formed by randomly mixing at least two types of guide links having different yield loads with respect to the link row in the longitudinal direction of the chain. And a second guide row having a second yield load different from the first yield load and a second guide row including the link row are arranged irregularly in the chain longitudinal direction,
Connecting the link plate and the first and second guide links with a connecting pin,
After assembling the silent chain, a pre-stress load is applied to the silent chain so that a load larger than the first and second yield loads acts on the first guide link and the second guide link, respectively. The mesh pitch of the first guide row and the second guide row after removing the stress load is arranged irregularly in the longitudinal direction of the chain.
A method for producing a silent chain. A method of manufacturing a silent chain,
A first link plate having a first yield load is obtained by stacking at least two types of link plates having a pair of teeth and pin holes and having different yield loads in the thickness direction and the longitudinal direction. And a second link row composed of a second link plate having a second yield load different from the first yield load are arranged irregularly in the longitudinal direction of the chain, and the link plates are connected. Connect with a pin,
After assembling the silent chain, a pre-stress load is applied to the silent chain so that a load larger than the first and second yield loads acts on the first link plate and the second link plate, respectively. The mesh pitch of the first link row and the second link row after removing the stress load is arranged irregularly in the chain longitudinal direction.
A method for producing a silent chain.

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