JP2015215013A - Chain transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chain transmission device which reduces a friction loss between a chain and a sprocket, and suppresses the wear of the chain and the sprocket.SOLUTION: In a chain transmission device 100 which is constituted of a chain 110 and a sprocket 150, the chain 110 is constituted by alternately arranging a first plate row 120 and a second plate row 130 while displacing them by a half pitch in a chain longitudinal direction, and by connecting them so as to be bendable by a connecting pin 140. Also in the chain transmission device 100, the connecting pin 140 has a pair of pin end parts 141 which protrude from outside faces of link plates 121 arranged at both outer sides of a chain width direction, and the sprocket 150 has a sprocket main body 160 and ring-shaped guide parts 171 which are arranged at both outer sides of the sprocket main body 160, and guide the pin end parts 141 to the chain width direction.

Description

  The present invention relates to a chain transmission device including a chain and a sprocket.

  Conventionally, as a chain transmission device composed of a chain and a sprocket, a guide row composed of a pair of left and right guide plates and a middle plate disposed between the pair of left and right guide plates and a non-guide row composed of a plurality of inner plates, A chain transmission device is known that includes a chain that is alternately connected in the longitudinal direction of the chain by a connecting pin, and a sprocket having sprocket teeth that mesh with the link teeth of the middle plate and the inner plate (for example, see Patent Document 1). reference).

  In the chain transmission device described in Patent Document 1, a pair of guide plates are arranged so as to sandwich the sprocket, thereby preventing the chain from falling off the sprocket.

  On the other hand, as another chain transmission device, a chain in which an outer link row composed of a plurality of outer link plates and an inner link row composed of a plurality of inner link plates are alternately connected in the longitudinal direction of the chain by connecting pins; A chain transmission device comprising a sprocket body having sprocket teeth meshing with link teeth of the outer link plate and the inner link plate and a sprocket having flanges arranged on both outer sides of the sprocket body is known. (See Patent Document 2).

  In the chain transmission device described in Patent Document 2, the pair of flanges of the sprocket are arranged so as to sandwich the outer link plate, thereby preventing the chain from falling off the sprocket.

Japanese Patent Laid-Open No. 10-238597 JP 2011-17354 A

  However, in the chain transmission device described in Patent Document 1, if the chain is swung in the chain width direction during chain travel, the side surface of the sprocket teeth and the inner side surface of the guide plate interfere with each other, causing damage to the guide plate or the sprocket. And there is a problem that friction loss due to interference occurs. In addition, since the gap between the inner surfaces of the pair of guide plates is set to be larger than the width of the sprocket so that a certain gap is generated between the inner surface of the guide plate and the side surface of the sprocket, A part of the adjacent inner plate does not mesh with the sprocket teeth, that is, because the inner plate only partially meshes with the sprocket teeth, the tooth stress at the time of meshing increases, and the link teeth and sprocket teeth of the inner plate There is also a problem that the wear of the steel advances.

  On the other hand, in the chain transmission device described in Patent Literature 2, when the chain is swung in the chain width direction during chain travel, the inner surface of the flange and the outer surface of the outer link plate interfere with each other, resulting in friction loss. There was a problem. In addition, there is a problem in that a larger friction loss than usual occurs because the load related to the interference with the flange and the engagement with the sprocket teeth is applied to the outer link plate at the start of the engagement where the largest load is generated. In addition, since the outer link plate having link teeth that mesh with the sprocket teeth is fixed to the connecting pin, the degree of freedom of bending of the outer link plate is impaired, and the smooth meshing between the chain and the sprocket is hindered. is there.

  Therefore, the present invention is to solve these problems, and an object of the present invention is to provide a chain transmission device that reduces friction loss between the chain and the sprocket and suppresses wear of the chain and the sprocket. Is.

  The present invention is a chain transmission device including a chain and a sprocket, wherein the chain includes a first plate row and a second plate row including a plurality of link plates arranged in parallel in the chain width direction. A pair of pin ends projecting from the outer side surfaces of the link plates arranged on both outer sides in the chain width direction are configured to be alternately arranged by being shifted by a half pitch in the direction and to be bent by connecting pins. The sprocket includes a sprocket body having a plurality of sprocket teeth, and a ring-shaped pin guide portion that is disposed on both outer sides of the sprocket body and guides the pin end in the chain width direction. By doing so, the above-mentioned problems are solved.

According to the first aspect of the present invention, the ring-shaped pin guide portions are provided on both outer sides of the sprocket body, and the pin end portions of the chain are guided by the pin guide portions, so that they are arranged on both outer sides in the chain width direction. In addition, the contact area between the outermost plate and the sprocket can be avoided and the contact area between the chain and the sprocket can be reduced, so that friction loss between the chain and the sprocket can be reduced and wear of the chain and sprocket can be suppressed. Can do.
Further, by guiding the pin end located on the outermost side of the chain in the chain width direction, it is possible to avoid a situation in which a part of the link plate is only partially engaged with the sprocket teeth as in Patent Document 1. Therefore, wear of the chain and sprocket can be suppressed.

According to the second aspect of the present invention, the outermost plate that does not contact the sprocket teeth is fixed to the connecting pin, and the middle plate having the link teeth is loosely fitted to the connecting pin. It is possible to reduce the weight of the chain by the amount not formed, and to reduce the contact area between the link plate adjacent to the outermost plate and the outermost plate in the chain width direction, and mesh with the sprocket teeth. The number of link plates can be reduced to reduce the friction loss between the chain and the sprocket, and moreover, it is possible to ensure the flexibility of bending of all the link plates that mesh with the sprocket teeth. Can be smoothly engaged with the sprocket.
According to the third aspect of the present invention, since the pin guide portion protrudes from the inner surface of the flange portion, the pin guide portion accurately guides only the pin end portion, and the pin guide portion is other than the pin end portion. Since it is possible to avoid contact with the chain, an increase in friction loss can be prevented.
According to the fourth aspect of the present invention, when the guide portion that guides the pin end portion is formed on the inner surface side of the outer peripheral end portion of the pin guide portion, the chain is shaken in the chain width direction. Even so, the chain can be smoothly guided onto the sprocket body at the start of meshing of the chain with the sprocket.
According to the invention of claim 5, since the spacer is disposed between the sprocket body and the flange portion, it is possible to reduce the width of the sprocket body, thereby reducing the cost and weight of the sprocket. can do.
According to the sixth aspect of the present invention, not only can the cost and weight of the flange portion be reduced by forming the thinned portion on the inner peripheral side of the ring-shaped pin guide portion, but also the flange portion Since the elasticity can be improved, excessive interference between the pin guide portion of the sprocket and the pin end portion of the chain can be avoided.

The perspective view which shows the chain which concerns on 1st Embodiment. The perspective view which shows the chain transmission apparatus which concerns on 1st Embodiment. The top view which shows the chain transmission apparatus which concerns on 1st Embodiment. The perspective view which shows the chain transmission apparatus which concerns on 2nd Embodiment. The top view which shows the chain transmission apparatus which concerns on 2nd Embodiment. The perspective view which shows the chain transmission apparatus which concerns on 3rd Embodiment. The perspective view which shows the chain transmission apparatus which concerns on 4th Embodiment. The top view which shows the chain transmission apparatus which concerns on 4th Embodiment.

  Below, chain transmission 100 concerning a 1st embodiment of the present invention is explained based on a drawing.

  The chain transmission device 100 is incorporated in a timing system for an automobile engine, and includes a chain 110 configured as a timing chain and a sprocket 150 meshing with the chain 110 as shown in FIG.

  First, the configuration of the chain 110 will be described below.

  As shown in FIG. 1, the chain 110 includes a plurality of first plate rows 120 and a plurality of second plate rows 130 that are alternately arranged with a half-pitch shift in the longitudinal direction of the chain and are connected to be bent by connecting pins 140. It is a thing.

  As shown in FIG. 1, the first plate row 120 includes a pair of outermost plates 121 disposed on both outer sides in the chain width direction, and a plurality of middle plates 122 disposed between the pair of outermost plates 121. It is composed of The second plate row 130 is composed of a plurality of inner plates 131 arranged in parallel in the chain width direction.

  The outermost plate 121, the middle plate 122, and the inner plate 131 each have a pair of pin holes formed side by side in the chain longitudinal direction. The plurality of first plate rows 120 and the plurality of second plate rows 130 are configured such that the connecting pins 140 are inserted into the pin holes of the middle plate 122 and the inner plate 131 in a loosely fitted state, and both end sides of the connecting pins 140 are arranged at the outermost sides. By being fixed to the pin holes of the plate 121 by press-fitting, the plates 121 are connected so as to be bent. Pin end portions 141 that are both ends of the connecting pin 140 protrude from the outer surface of the outermost plate 121.

  The outermost plate 121 is formed in a shape that does not contact the sprocket teeth 161. The middle plate 122 and the inner plate 131 respectively have a pair of V-shaped link teeth for meshing with the sprocket teeth 161 on the inner side of the chain bend.

  Next, the configuration of the sprocket 150 will be described below.

  As shown in FIG. 2, the sprocket 150 includes a metal sprocket body 160 having a plurality of sprocket teeth 161 on its outer periphery, and a pair of flange portions 170 formed separately from the sprocket body 160. Yes.

  The width dimension of the sprocket teeth 161 is set to a dimension sufficient for the link plates 122 and 131 other than the outermost plate 121 to mesh with the sprocket teeth 161 over the entire region in the chain width direction. That is, the width dimension of the sprocket teeth 161 is set larger than the interval between the inner side surfaces of the left and right outermost plates 121 and larger than the height dimension of the connecting pin 140.

  Each flange portion 170 is formed of a synthetic resin and has a disk shape with a shaft hole formed in the center as shown in FIG. The flange portions 170 are attached to both outer sides of the sprocket body 160, respectively.

  In this embodiment, as shown in FIGS. 2 and 3, the outer peripheral side of the disc-shaped flange portion 170 functions as a ring-shaped pin guide portion 171 that guides the pin end portion 141 in the chain width direction.

  Next, the chain transmission apparatus 200 of 2nd Embodiment is demonstrated based on FIG. 4 and FIG. Here, the second embodiment is exactly the same as the first embodiment described above except for a partial configuration. Therefore, by replacing the reference numerals in the 100s shown in the specification and drawings relating to the first embodiment with the reference numerals in the 200s, the description of the configuration other than the differences will be omitted.

  First, in the second embodiment, only the configuration of the flange portion 270 is different from that in the first embodiment. That is, in the second embodiment, as shown in FIGS. 4 and 5, the pin guide portion 271 protrudes inward from the inner surface of the flange portion 270 at the outer peripheral portion of the flange portion 270.

  Further, in the present embodiment, as shown in FIG. 5, the inner side of the outer peripheral side tip portion of the pin guide portion 271 is inclined inward in the chain width direction, and the engagement of the chain 220 and the sprocket 250 is started. Sometimes, it has a guide portion 271a for guiding the pin end portion 241 toward the inner side in the chain width direction. In the example shown in FIG. 5, the guide portion 271a is formed in a curved convex shape, but the guide portion 271a may be formed in a flat shape.

  Next, the chain transmission apparatus 300 of 3rd Embodiment is demonstrated based on FIG. Here, the third embodiment is exactly the same as the second embodiment described above except for a partial configuration. Therefore, by replacing the reference numerals in the 200th series shown in the specification and drawings relating to the second embodiment with the reference numerals in the 300th series, the description of the configuration other than the difference will be omitted.

  First, in 3rd Embodiment, only the structure of the flange part 370 differs from the case of 2nd Embodiment. That is, in the third embodiment, as shown in FIG. 6, a plurality of lightening portions 372 that penetrates in the thickness direction of the flange portion 370 are formed on the inner peripheral side of the ring-shaped pin guide portion 371. In the present embodiment, the lightening portions 372 are formed on both of the pair of flange portions 370, but the lightening portions 372 may be formed only on one flange portion 370.

  Next, the chain transmission device 400 of 4th Embodiment is demonstrated based on FIG. 7 and FIG. Here, the fourth embodiment is exactly the same as the third embodiment described above except for a partial configuration. Therefore, by replacing the reference numerals in the 300th series shown in the specification and drawings relating to the third embodiment with the reference numerals in the 400th series, explanations of configurations other than the differences will be omitted.

  First, in the fourth embodiment, only the configuration of the sprocket 450 is different from that in the third embodiment. That is, in the fourth embodiment, as shown in FIGS. 7 and 8, the sprocket 450 is disposed between the sprocket body 460 and the flange portion 470 in addition to the sprocket body 460 and the flange portion 470. The spacer 480 is provided. The spacer 480 is made of synthetic resin and has a shaft hole at the center thereof.

  In the fourth embodiment, the width dimension of the sprocket body 460 is set to be smaller than the height dimension of the connecting pin 440 and larger than the interval between the inner side surfaces of the left and right outermost plates 421.

In the above-described embodiment, the chain is described as a timing chain for an automobile engine. However, the application of the chain of the present invention is not limited to this, and any chain such as a transmission chain or a conveyance chain may be used. .
In the above-described embodiment, the chain is described as a silent chain. However, a specific aspect of the chain is that the first plate row and the second plate row including a plurality of link plates arranged in parallel in the chain width direction are alternately arranged with a half pitch shift in the chain longitudinal direction, and the connection pins Any one can be used as long as it can be bent and the pin ends of the connecting pins protrude from the outer surfaces of the link plates arranged on both outer sides in the chain width direction. For example, a roller chain or bush chain There may be.
In the above-described embodiment, the outermost plate arranged on the outermost side in the chain width direction has been described as not having link teeth, but the outermost plate is provided with link teeth, and the outermost plate is also sprocket teeth. You may comprise so that it may mesh.
In the above-described embodiment, the outer peripheral portion of the flange portion attached to the sprocket body is used as a ring-shaped pin guide portion, but the specific mode of the pin guide portion is not limited to this, and the sprocket body is not limited to this. Anything can be used as long as it guides the end of the pin of the chain that has been wound around.
The material of each component of the chain or sprocket may be any material such as metal or synthetic resin.
Further, any method may be used for attaching the flange portion to the sprocket body, and the sprocket body and the flange portion may be integrally formed.
In addition, the chain transmission device may be configured by arbitrarily combining the configurations of the above-described embodiments.

100, 200, 300, 400 ... Chain transmission 110, 210, 310, 410 ... Chain 120 ... First plate row 121 ... Outermost plate 122 ... Middle plate 130 ... First Two plate rows 131 ... Inner plate 140 ... Connecting pins 141, 241, 341, 441 ... Pin ends 150, 250, 350, 450 ... Sprockets 160, 260, 360, 460 ... Sprockets Main body 161, 261, 361, 461 ... Sprocket teeth 170, 270, 370, 470 ... Flange parts 171, 271, 371, 471 ... Pin guide parts 271a, 471a ... Guide parts 372, 472 .. Meat removal part 480 ・ ・ ・ Spacer

Claims (6)

A chain transmission device comprising a chain and a sprocket,
In the chain, a first plate row and a second plate row including a plurality of link plates arranged in parallel in the chain width direction are alternately arranged with a half pitch shift in the chain longitudinal direction, and are connected to be bent by a connecting pin. Configured
The connecting pin has a pair of pin end portions protruding from the outer surface of the link plate arranged on both outer sides in the chain width direction,
The sprocket includes a sprocket main body having a plurality of sprocket teeth, and a ring-shaped pin guide portion that is disposed on both outer sides of the sprocket main body and guides the pin end portion in the chain width direction. Features a chain transmission. The first plate row is disposed on both outer sides in the chain width direction, and is disposed on the inner side in the chain width direction with a pair of outermost plates into which the connecting pins are inserted in a fixed state in the pin holes. A middle plate into which the connecting pin is inserted in a loosely fitted state,
The middle plate has link teeth that mesh with the sprocket teeth,
The chain transmission device according to claim 1, wherein the outermost plate has a shape that does not contact the sprocket teeth. The sprocket has the sprocket main body and a pair of flange portions arranged on both outer sides of the sprocket main body and formed with the pin guide portions,
The chain transmission device according to claim 1, wherein the pin guide portion protrudes inward from an inner surface of each flange portion.   The chain according to any one of claims 1 to 3, wherein the pin guide portion has a guide portion that guides the pin end portion on an inner surface side of an outer peripheral end portion thereof. Transmission device.   The sprocket includes the sprocket body, a flange portion that is disposed on both outer sides of the sprocket body, the pin guide portion is formed, and a spacer that is disposed between the sprocket body and the flange portion. The chain transmission device according to any one of claims 1 to 4, wherein the chain transmission device is provided. The sprocket has the sprocket main body and a flange portion that is disposed on both outer sides of the sprocket main body and in which the pin guide portion is formed,
The chain transmission device according to any one of claims 1 to 5, wherein the flange portion has a lightening portion on an inner peripheral side of the ring-shaped pin guide portion.

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