JP2012013111A - Silent chain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a silent chain which suppresses manufacturing and assembling costs, reduces deterioration of tensile strength, wear elongation, heat generation, noise, and tooth skipping accompanying deformation of a locker pin without increasing weight or size, and enlarges the tolerance of alignment displacement.SOLUTION: The silent chain 100 is structured by connecting a pair of guide plates 110 and multiple link plates 120, 130 with locker pins 141, 142 alternately. In this chain, the guide plates 110 are divided into two at a position between a pair of front and rear pin holes.

Description

  The present invention relates to a silent chain for power transmission in which a large number of link plates are connected by connecting pins and a guide plate is arranged on the outermost side.

  Conventionally, a silent chain used as a power transmission chain has a pair of guide plates, a guide link row made up of a plurality of link plates arranged between the guide plates, and a non-guide link row made up of a plurality of link plates. Then, a pair of long and short rocker pins having a rocker surface are inserted into the pair of front and rear pin holes of the guide plate and the link plate so that the rocker surface faces each other, and the link plate of the guide link row and the link of the non-guide link row It is known that plates are alternately connected and knitted.

  As shown in FIGS. 8 and 9, the known silent chain 500 alternately stacks a link plate 520 of a guide link row and a link plate 530 of a non-guide link row each having a pair of teeth and pin holes. In addition, a pair of long and short rocker pins 541 and 542 having a rocker surface in each pin hole of these link plates 520 and 530 are inserted with the rocker surfaces facing each other to pivot each link plate 520 and 530. Further, the guide plate 510 is disposed on the outermost side of the link plate 520 of the guide link row, and the guide plate 510 is closely fitted with the long rocker pin 541 to prevent the long rocker pin 541 from coming off. is doing.

  Further, as shown in FIG. 10, the guide plate 510 provided on the outermost side is formed in a shape that covers both sides of the teeth T of the sprocket S when the teeth of the link plate 520 of the guide link row mesh with the sprocket S. And has a guide function for regulating the silent chain 500 so as not to shift in the width direction.

The known silent chain 500 meshes with the sprocket S to generate tension, but the tension received from the sprocket S is received by the link plates 520 and 530, and the guide plate 510 is not directly subjected to tension.
As a result, due to the slight clearance between the link plates 520 and 530 and the pair of long and short rocker pins 541 and 542 and the influence of elastic deformation, both ends of the long rocker pin 541 are guided by the guide plate 510 as shown in FIG. Therefore, the central portion is deformed into an arcuate shape, and the guide plate 510 is also bowed.

  As a result, the contact between the link plates 520 and 530 and the pair of long and short rocker pins 541 and 542 in the width direction becomes non-uniform, tension is concentrated locally, and the overall tensile strength of the silent chain 500 is increased. There has been a problem that wear decreases, heat generation, and noise increase due to repetitive deformation.

  Further, when meshing with the sprocket S, the effect of the deformation causes a difference in tooth pitch between the link plate 520 of the guide link row and the link plate 530 of the non-guide link row, resulting in unstable seating, tooth skipping and noise. There were problems such as an increase.

  Further, when the alignment of the sprocket is shifted in the width direction, as shown in FIG. 12, the link plate 520 of the guide link row is almost because the guide plate 510 closely fitted with the long rocker pin 541 exists on the outermost side. Since the tilt chain cannot be tilted and only the link plate 530 of the non-guide link row is tilted and the silent chain 500 is skewed, there is a problem that an allowable amount of misalignment in the width direction becomes very small. It was.

  To alleviate these problems, in a silent chain with a cylindrical rocker pin, the guide plate is loosely fitted in the longitudinal direction with respect to the rocker pin, and the locker pin retaining plate is tightly fitted outside the guide plate. The combination is known (see Patent Document 1, Patent Document 2, etc.).

JP 2000-205346 A (all pages, all figures) JP 2002-130385 A (all pages, all figures)

According to the known silent chain described in Patent Documents 1, 2, etc., although each problem due to the deformation of the rocker pin is reduced to some extent, the number of parts unrelated to the original tensile strength of the silent chain increases. There was a problem that the manufacturing and assembly costs increased and the weight of the silent chain also increased.
In addition, since the size of the silent chain in the width direction increases, the size of the chain transmission device to be applied also increases, and there is a problem that the reduction in size and weight is hindered.

  The present invention solves the problems of the prior art as described above. That is, the object of the present invention is to reduce the cost of manufacturing and assembling, and to deform the rocker pin without increasing the weight and size. It is to provide a silent chain that reduces the accompanying decrease in tensile strength, wear elongation, heat generation, noise, tooth skipping, and increases the tolerance of misalignment.

  The invention according to claim 1 includes a pair of guide plates, a guide link row composed of a plurality of link plates arranged between the guide plates, and a non-guide link row composed of a plurality of link plates, A pair of long and short rocker pins having a rocker surface is inserted into the pair of front and rear pin holes of the guide plate and link plate so that the rocker surface faces each other, and the link plate of the guide link row and the link of the non-guide link row In a silent chain in which plates are alternately connected and knitted, the guide plate is divided into two at a position between a pair of front and rear pin holes, thereby solving the above-mentioned problem.

  The invention according to claim 2 is characterized in that, in addition to the structure of the silent chain described in claim 1, any one of the guide plates divided into two does not have a guide function. Is a further solution.

  In the invention according to claim 3, in addition to the structure of the silent chain described in claim 1, one of the guide plates divided into two has a guide function outside the link plate of the guide link row. And the other of the two divided guide plates has a guide function outside the link plate of the non-guide link row, thereby further solving the above-mentioned problem.

  The silent chain according to the first aspect of the present invention includes a pair of guide plates, a guide link row including a plurality of link plates arranged between the guide plates, and a non-guide link row including a plurality of link plates. A pair of long and short rocker pins having a rocker surface is inserted into the pair of front and rear pin holes of the guide plate and the link plate so that the rocker surface faces each other, and the link plate of the guide link row and the link plate of the non-guide link row In the silent chain that is alternately connected and knitted, the guide plate is divided into two at the position between the pair of front and rear pin holes, so that each link plate receives tension and moves in the direction in which the long rocker pins are separated. However, each of the two guide plates can move freely with the long rocker pins. Therefore, each link plate and a pair of long and short rocker pins abuts uniformly in the width direction, so that the tension does not concentrate locally, the tensile strength of the entire silent chain is reduced, and repeated deformation Does not increase heat generation or noise.

  Moreover, the guide plate divided into two has a guide function at the outermost side in the width direction and has a function of tightly fitting to the long rocker pin to prevent it from being removed, so that no separate parts are required. Therefore, the manufacturing and assembly costs and weight do not increase, and the size in the width direction does not increase, so that the applied chain transmission device can be reduced in size and weight.

  The silent chain according to the second aspect of the present invention has the effect that the silent chain according to the first aspect of the present invention has the effect that either one of the two guide plates divided into two has no guide function. One of the guide plates divided into two can be closely fitted to the long rocker pin and can be made small with only a retaining function, so that the weight can be further reduced and the applied chain The transmission apparatus can be reduced in size and weight.

  The silent chain according to the third aspect of the invention has the effect that the one of the two divided guide plates has a guide function outside the link plate of the guide link row, in addition to the effect of the silent chain according to the first aspect. Yes, because the other of the two divided guide plates has a guide function outside the link plate of the non-guide link row, it is possible to guide in the width direction outside the teeth of all sprockets. It becomes possible to mesh with the sprocket more smoothly, and noise and tooth skipping can be further reduced.

The top view of the silent chain which is 1st Example of this invention. The side view of the silent chain which is 1st Example of this invention. Explanatory drawing at the time of winding around the sprocket of the silent chain which is 1st Example of this invention. Explanatory drawing at the time of tension | pulling of the silent chain which is 1st Example of this invention. Explanatory drawing at the time of skew of the silent chain which is 1st Example of this invention. The side view of the silent chain which is 2nd Example of this invention. The side view of the silent chain which is 3rd Example of this invention. The top view of the conventional silent chain. A side view of a conventional silent chain. Explanatory drawing at the time of winding around the sprocket of the conventional silent chain. Explanatory drawing at the time of tension | pulling of the conventional silent chain. Explanatory drawing at the time of skew of the conventional silent chain.

  The present invention has a pair of guide plates, a guide link row made up of a plurality of link plates arranged between the guide plates, and a non-guide link row made up of a plurality of link plates. Silently composed of a pair of long and short rocker pins having a rocker surface in a pair of pin holes, with the rocker surfaces facing each other, and a link plate of a guide link row and a link plate of a non-guide link row alternately connected and knitted In the chain, the guide plate is divided into two at the position between the pair of front and rear pin holes, reducing the manufacturing and assembly costs, reducing the tensile strength associated with the deformation of the rocker pins without increasing the weight and size, The effect of reducing wear elongation, heat generation, noise, tooth skipping and increasing the tolerance of misalignment As long as it exhibits, specific embodiments thereof are may any be any one.

In addition, the shape, the deformation amount, the deviation amount, and the like of each component shown in each drawing are not actual sizes, but are simplified or exaggerated for easier understanding in the range where the invention is clearly supported. .
Also, the number of link plates shown in each drawing is different for the sake of explanation, but in practice the number may be any.

Below, the silent chain which is an Example of this invention is demonstrated based on drawing.
As shown in FIGS. 1 and 2, the silent chain 100 according to the first embodiment of the present invention includes a guide link row link plate 120 and a non-guide link row link each having a pair of teeth and pin holes. The plates 130 are alternately stacked, and a pair of long and short rocker pins 141 and 142 each having a rocker surface in each pin hole of the link plates 120 and 130 are inserted so that the rocker surfaces face each other. The plates 120 and 130 are pivotally connected, and the guide plate 110 divided into two is arranged on the outermost side of the link plate 120 in the guide link row.

  The guide plate 110 is divided into two so as to have a clearance C at the center position between the pair of front and rear pin holes, and each guide plate 110 is closely fitted with one long rocker pin 141 to be a long rocker pin. As shown in FIG. 3, when the teeth of the link plate 120 of the guide link row mesh with the sprocket S, the silent chain is formed on both sides of the teeth T of the sprocket S. It has a guide function for regulating 100 so that it does not shift in the width direction.

  According to the silent chain 100 according to the first embodiment of the present invention having the above-described configuration, when tension is generated by meshing with the sprocket S, it is received by each link plate 120, 130, and the length of each link plate 120, 130 is increased. The silent chain 100 slightly extends in the tension direction due to a slight clearance and elastic deformation between the short pair of rocker pins 141 and 142.

  At this time, as shown in FIG. 4, both ends of each long rocker pin 141 are closely fitted to the two divided guide plates 110a and 110b and can be displaced independently from each other. The force from the plates 120 and 130 can be evenly received in the width direction, and the central portion does not deform into an arcuate shape.

Accordingly, the link plates 120 and 130 and the pair of long and short rocker pins 141 and 142 abut against each other evenly in the width direction, and the tensile strength as a whole of the silent chain 100 is reduced without locally concentrating the tension. Never do.
Further, the pair of long and short rocker pins 141 and 142 are not repeatedly deformed, and wear elongation, heat generation, and noise can be reduced.

  Also, when engaging with the sprocket S, both ends of each long rocker pin 141 are closely fitted to the two divided guide plates 110a and 110b, respectively, and can be displaced independently of each other. A difference in tooth pitch can be suppressed between the link plate 120 in the row and the link plate 130 in the non-guide link row, the seating can be stabilized, and tooth skipping and noise can be prevented.

  Further, when the alignment of the sprocket is shifted in the width direction, as shown in FIG. 5, both ends of each long rocker pin 141 are closely fitted to the guide plates 110a and 110b divided into two parts, Since the link plate 120 of the guide link row and the link plate 130 of the non-guide link row can be evenly inclined so that the silent chain 100 can be skewed, an allowable amount of misalignment in the width direction is possible. Can be increased.

  In addition, the guide plates 110a and 110b divided into two can be made the same size as the conventional guide plate in the width direction without increasing the weight as compared with the conventional guide plate. This makes it possible to reduce the size and weight of the chain transmission device.

  As shown in FIG. 6, the silent chain 200 according to the second embodiment of the present invention includes a link plate 220 of a guide link row and a link plate 230 of a non-guide link row each having a pair of teeth and pin holes. A pair of long and short rocker pins 241 and 242 having a rocker surface in each pin hole of these link plates 220 and 230 are inserted so as to face each other, and each link plate 220, 230 230 is pivotably connected, and a guide plate 210 divided into two is arranged on the outermost side of the link plate 220 of the guide link row.

  The guide plate 210 is divided into two at the center position between the pair of front and rear pin holes, and one long guide plate 211 closely fits with the long rocker pin 241 and comes out of the long rocker pin 241. In addition to being stopped, the link plate 220 of the guide link row is formed in a shape that is applied to both sides of the teeth T of the sprocket S when the teeth of the link plate 220 mesh with the sprocket S. It has a guide function.

  The other short guide plate 212 is closely fitted with the long rocker pin 241 to prevent the long rocker pin 241 from coming off, and has a size necessary for fitting with the long rocker pin 241. As a size that fits only inside the outer shape, it is configured not to have a guide function.

  According to the silent chain 200 according to the second embodiment of the present invention having the above-described configuration, in addition to the same operation and effect as the silent chain 100 according to the first embodiment, the short guide plate 212 has only a retaining function. In addition to being lightweight, the long guide plate 211 can also have a minimum size that can achieve the guide function, further reducing the weight of the silent chain 200, and the applied chain transmission. The apparatus can be further reduced in size and weight.

  As shown in FIG. 7, the silent chain 300 according to the third embodiment of the present invention includes a link plate 320 of a guide link row and a link plate 330 of a non-guide link row each formed with a pair of teeth and pin holes. While alternately laminating, a pair of long and short rocker pins 341 and 342 having a rocker surface in each pin hole of these link plates 320 and 330 are inserted to face each other, and each link plate 320, 330 has a structure in which the guide plate 310 divided into two is arranged on the outermost side of the link plate 320 of the guide link row.

  The guide plate 310 is divided into two at the center position between the pair of front and rear pin holes, and one long guide plate 311a closely fits with the long rocker pin 341 and comes out of the long rocker pin 341. It is formed in a shape that is applied to both sides of the teeth T of the sprocket S when the teeth of the link plate 320 of the guide link row mesh with the sprocket S, and the silent chain 200 is restricted so as not to shift in the width direction. It has a guide function.

  The other long guide plate 311b is closely fitted to the long rocker pin 341 to prevent the long rocker pin 341 from coming off, and when the teeth of the link plate 330 in the non-guide link row mesh with the sprocket S, It is formed in a shape on both sides of the tooth T, and has a guide function for regulating the silent chain 200 so that it does not shift in the width direction.

  According to the silent chain 300 of the third embodiment of the present invention having the above-described configuration, in addition to the same operation and effect as the silent chain 100 of the first embodiment, both the long guide plates 311a and 311b are respectively Since the guide function is provided outside the link plate 320 of the guide link row and outside the link plate 330 of the non-guide link row, the width direction guide can be performed outside the teeth of all the sprockets. It is possible to mesh with the sprocket, and noise and tooth skipping can be further reduced.

  As described above, according to the present invention, the manufacturing and assembly costs are suppressed, and the decrease in tensile strength, wear elongation, heat generation, noise, and tooth skipping associated with the deformation of the rocker pin are achieved without increasing the weight and size. The effect is enormous, such as being able to reduce and increase the tolerance of misalignment.

  In each of the above embodiments, the guide plate is divided into two conventional shapes, a circular shape, and an oval shape. However, the rocker pin can be prevented from coming off and the guide function can be exhibited. Any shape may be used as long as it has a shape.

  Further, in the second embodiment, the long guide plate 211 is formed in a shape that covers both sides of the teeth T of the sprocket S when the teeth of the link plate 220 of the guide link row mesh with the sprocket S. The plate 211 is formed in a shape (an oblong shape extending in the left-right reverse diagonal direction in FIG. 6) applied to both sides of the teeth T of the sprocket S when the teeth of the link plate 230 in the non-guide link row mesh with the sprocket S. Also good.

  Further, the long guide plate 211 has a shape that covers both teeth of the link plate 220 of the guide link row and the link plate 230 of the non-guide link row (a shape other than the oval shape extending in the left and right diagonal directions in FIG. 6). In that case, the same actions and effects as those of the third embodiment can be obtained.

100, 200, 300, 500 ... Silent chain 110, 210, 310, 510 ... Guide plate 211, 311 ... Long guide plate 212 ... Short guide plates 120, 220, 320, 520 ... Guide link row link plates 130, 230, 330, 530 ... Non-guide link row link plates 141, 241, 341, 541 ... Long rocker pins 142, 242, 342, 542 ... Short rocker pins

Claims (3)

A pair of guide plates, a guide link row made up of a plurality of link plates arranged between the guide plates, and a non-guide link row made up of a plurality of link plates, and a pair of front and rear of the guide plate and the link plate Silently formed by inserting a pair of long and short rocker pins having a rocker surface in the pin holes so that the rocker surfaces face each other and the link plates of the guide link rows and the link plates of the non-guide link rows are alternately connected and knitted In the chain
The silent chain, wherein the guide plate is divided into two at a position between a pair of front and rear pin holes.   2. The silent chain according to claim 1, wherein one of the guide plates divided into two does not have a guide function. One of the guide plates divided into two has a guide function outside the link plates of the guide link row,
2. The silent chain according to claim 1, wherein the other of the two divided guide plates has a guide function outside the link plates of the non-guide link row.

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