JP2013174304A - Roller chain and chain transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roller chain which reduces noise generated by a lubricant at engagement with a sprocket and by the lubricant at the release of the engagement.SOLUTION: A roller chain 110 comprises: a pair of right and left inner link plates 111; a bush 112 whose bush ends are pressure-inserted in to bush holes of the inner link plates; a pair of right and left outer link plates 114 arranged at both outer sides of the pair of right and left inner link plates, respectively; connecting pins 113 for pressure-inserting pin ends into pin holes of the outer link plates while rotatably being inserted and fit to the bush; and rollers 115 which are arranged between the pair of right and left inner link plates, respectively, and loosely fit to the external periphery of the bush so as to be turnable. The chain makes the rollers engaged with a sprocket (120) by alternately and numerously connecting the inner link plates and the outer link plates by using the bushes and the connecting pins. Also in the roller chain 110, the rollers 115 are formed into spherical faces having the same curvature radii at respective parts of roller external peripheral faces 115a.

Description

  The present invention is a chain used in a power transmission mechanism of an automobile, an industrial machine, etc., and a pair of left and right inner link plates and a pair of left and right outer link plates are alternately connected in the longitudinal direction of the chain with connecting pins and bushes. The present invention relates to a roller chain that connects and meshes a sprocket with a roller, and a chain transmission device that includes the roller chain and the sprocket.

2. Description of the Related Art Conventionally, a chain and a transmission device are known in which a pair of left and right inner link plates and a pair of left and right outer link plates are alternately connected in the longitudinal direction of the chain with connecting pins and meshed with a sprocket. 1).
In addition, in order to obtain high lubricity over a long period of time, it is encouraged to supply a lubricant having a certain degree of viscosity to the chain and the sprocket.
Here, “lubricant” refers to highly viscous lubricating oil or grease.

Japanese Patent Laying-Open No. 2011-094660 (see FIG. 1)

However, the above-described conventional chain has a structure in which the outer peripheral surface of the cylindrical roller loosely fitted on the outer side of the bush with the inner link plate press-fitted and fixed at both ends is flat in the width direction of the roller. When the sprocket having the tooth bottom shape rotates, the lubricating oil film formed on the surface of the sprocket and the roller is strongly crushed when meshing with the sprocket, and there is a problem that a loud noise is generated when the sprocket escapes.
Furthermore, there is a problem that a large noise is generated due to a phenomenon in which the roller and the sprocket are peeled from the contact state between the roller and the sprocket by the viscous lubricant when the meshing is released with the rotation of the sprocket.

  Therefore, 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 noise caused by the lubricating oil when meshing with the sprocket and the noise caused by the lubricating oil when disengaged. It is an object of the present invention to provide a roller chain to be reduced and a chain transmission device including the roller chain and a sprocket.

  According to the first aspect of the present invention, a pair of left and right inner link plates, a bush for press-fitting a bushing end into a bushing hole of the inner link plate, and both outer sides of the pair of left and right inner link plates are arranged. A pair of left and right outer link plates, a connecting pin that is rotatably inserted into the bushing and press-fits a pin end into a pin hole of the outer link plate, and a pair of left and right inner link plates are disposed respectively. A roller chain that includes a roller that freely swingably fits on the outer periphery of the bush, and the inner link plate and the outer link plate are alternately connected in the longitudinal direction of the chain with bushes and connecting pins so that the roller meshes with the sprocket. The roller is formed into a spherical surface having the same radius of curvature at each part of the outer peripheral surface of the roller. It is intended to attain.

  The invention according to claim 2 is inserted into the pair of left and right inner link plates, the pair of left and right outer link plates respectively disposed on both outer sides of the pair of left and right inner link plates, and the insertion hole of the inner link plate. A coupling pin for press-fitting a pin end into a pin hole of the outer link plate, and a roller disposed between the pair of left and right inner link plates and rotatably fitted on the outer periphery of the coupling pin, In a roller chain in which the inner link plate and the outer link plate are alternately connected by a connecting pin in the longitudinal direction of the chain and the roller is meshed with the sprocket, the roller has the same radius of curvature at each part of the outer peripheral surface of the roller. The above-described problem is solved by forming the spherical surface.

  The invention according to claim 3 includes a roller chain formed by alternately connecting a pair of left and right inner link plates and a pair of left and right outer link plates in the longitudinal direction by connecting pins, and a tooth portion and a tooth bottom portion meshing with the roller chain. In the chain transmission device comprising the sprocket having the groove, the roller chain is the roller chain according to claim 1 or 2, wherein a tooth bottom portion of the sprocket extends in a circumferential direction of the sprocket. From the upper edge of the groove to the bottom, the upper edge of the groove is in contact with the outer circumferential surface of the roller at the side from the circumferential center of the sprocket in the groove, and the groove is advanced toward the circumferential center of the sprocket in the groove. At least one of the height of the roller and the width between the upper edges of the groove becoming wider. By being formed in a shape that allows contact with the bottom surface is intended to further solve the aforementioned problems.

  The roller chain of the present invention includes a pair of left and right inner link plates, a bush for press-fitting a bushing end into a bush hole of the inner link plate, and a pair of left and right outer links disposed on both outer sides of the pair of left and right inner link plates. A link plate, a connecting pin that is rotatably inserted into the bushing and press-fits a pin end into the pin hole of the outer link plate, and a pair of left and right inner link plates, and is rotated around the outer periphery of the bushing. By providing a roller that freely fits, not only can the inner link plate and the outer link plate be alternately connected in the longitudinal direction of the chain with bushes and connecting pins to engage the roller with the sprocket. It is possible to achieve a unique effect such as

According to the first aspect of the present invention, when the roller is formed into a spherical surface having the same radius of curvature at each part of the roller outer peripheral surface, when the roller chain meshes with the sprocket as the sprocket rotates, Since the lubricant between the roller and the tooth bottom portion of the sprocket is pushed out smoothly from the center in the width direction to the side in the width direction, noise due to the crushing of the lubricant can be reduced.
In addition, when the mesh is disengaged as the sprocket rotates, tension (surface tension) acts on the lubricant between the roller outer peripheral surface of the roller and the tooth bottom of the sprocket from the side in the width direction to the center in the width direction. Since the lubricant is smoothly guided from the side in the width direction to the center in the width direction and returns to the state before meshing, noise due to the lubricant can be reduced.
Furthermore, since the timing at which the shearing force acts on the lubricant is dispersed as compared with the conventional structure and the maximum value of the shearing force is reduced, noise caused by the lubricant can be reduced even when the meshing is disengaged.

  The roller chain according to the present invention includes a pair of left and right inner link plates, a pair of left and right outer link plates disposed on both outer sides of the pair of left and right inner link plates, and the insertion holes of the inner link plates. The inner link plate includes a connecting pin for press-fitting a pin end portion into the pin hole, and a roller that is disposed between the pair of left and right inner link plates and is rotatably fitted to the outer periphery of the connecting pin. In addition to connecting the outer link plate and the outer link plate alternately in the longitudinal direction of the chain with connecting pins, the roller can mesh with the sprocket, and the following specific effects can be obtained.

According to the second aspect of the present invention, when the roller is formed into a spherical surface having the same radius of curvature at each part of the roller outer peripheral surface, when the roller chain meshes with the sprocket as the sprocket rotates, Since the lubricant between the roller and the tooth bottom portion of the sprocket is smoothly pushed out from the center in the width direction so as to be divided sideways in the width direction, noise due to the extrusion of the lubricant can be reduced.
In addition, when the meshing disengages with the rotation of the sprocket, tension (surface tension) acts on the lubricant between the roller and the sprocket teeth from the side in the width direction to the center in the width direction. Since it smoothly moves from the direction side to the center in the width direction and returns to the state before meshing, noise due to the lubricant can be reduced.
Furthermore, since the timing at which the shearing force acts on the lubricant is dispersed as compared with the conventional structure and the maximum value of the shearing force is reduced, noise caused by the lubricant can be reduced even when the meshing is disengaged.

  A chain transmission device according to the present invention includes a roller chain formed by alternately connecting a pair of left and right inner link plates and a pair of left and right outer link plates in a longitudinal direction by connecting pins, and a tooth portion and a tooth bottom portion that mesh with the roller chain. By being configured with a sprocket, not only can power be transmitted, but also the following specific effects can be achieved.

According to the invention of claim 3, the roller chain is the roller chain described in claim 1 or claim 2, wherein the sprocket has a groove portion extending in the circumferential direction of the sprocket, The height of the groove from the upper edge to the bottom surface of the groove is increased as the groove rises in contact with the outer peripheral surface of the roller at the side of the circumferential edge of the sprocket in the groove. According to claim 1 or claim 2, wherein the roller is formed in a shape that allows contact between the outer peripheral surface of the roller and the bottom surface of the groove by at least one of lowering and widening between the upper edges of the groove. In addition to the effects produced by the invention, when engaging, the impact is reduced by contact at two locations on the roller outer peripheral surface and the upper edge on both sides in the width direction of the groove, thus reducing noise. Rukoto can.
Furthermore, first, the width direction side of the roller outer peripheral surface is in contact with the upper edges on both sides in the width direction of the groove, and then the center of the roller outer surface in the width direction is in close contact with the tooth bottom so that the force is transmitted. Since the location where noise is reduced and the location where force is transmitted are different, the durability is good and the noise reduction effect can be sustained for a long time.

The perspective view of the roller chain of 1st Example of this invention. The partial cross-sectional top view and side view of the roller chain of 1st Example of this invention. The perspective view of the conventional (standard tooth profile) sprocket. Sectional drawing seen from the circumferential direction of the sprocket which shows the mode of the lubricant when the roller chain of 1st Example of this invention meshes with the sprocket of a conventional type, and meshing | engagement disengagement. The partial cross-sectional top view and side view of the roller chain of 2nd Example of this invention. The perspective view of the sprocket of the special tooth form of the chain transmission which applied the roller chain of 3rd Example of this invention. The plane sectional view of the special tooth form sprocket of the chain transmission which applied the roller chain of the 3rd example of the present invention. Sectional drawing seen from the sprocket circumferential direction which shows meshing | engagement with the roller chain of the chain transmission of 3rd Example of this invention, and the sprocket of a special tooth form.

  The present invention provides a roller chain in which a pair of left and right inner link plates and a pair of left and right outer link plates are alternately connected and knitted in the longitudinal direction of the chain and meshed with a sprocket. When the roller chain meshes with the sprocket, the lubricant between the roller and the teeth is smoothly pushed out from the center in the width direction to the side in the width direction. Yes, if tension (surface tension) acts on the lubricant between the roller outer peripheral surface and the tooth bottom part from the width direction side to the width direction at the time of disengagement, a specific embodiment thereof May be anything.

  Further, the chain transmission device of the present invention includes a roller chain in which a roller is formed in a spherical surface having the same radius of curvature at each part of the outer peripheral surface of the roller, and a sprocket having a tooth portion and a tooth bottom portion meshing with the roller chain. By being configured, when the roller chain meshes with the sprocket, the lubricant between the roller and the tooth part is smoothly pushed out from the center in the width direction to the side in the width direction. As long as tension (surface tension) acts on the lubricant between the surface and the tooth bottom part from the width direction side to the width direction center, the specific embodiment may be any. Absent.

  For example, the roller material of the roller chain may be any material, such as metal, ceramics, resin, etc., as long as it has some durability.

Below, the roller chain 110 of the chain transmission 100 which is 1st Example of this invention is demonstrated based on FIG. 1 thru | or FIG.
Here, FIG. 1 is a perspective view of the roller chain 110 of the first embodiment of the present invention, and FIG. 2A is a partial sectional plan view of the roller chain 110 of the first embodiment of the present invention. FIG. 2B is a side view of the roller chain 110 according to the first embodiment of the present invention, and FIG. 3 is a perspective view of a conventional sprocket 120, and FIGS. FIG. 3 is a cross-sectional view of the sprocket 120 as seen from the circumferential direction, showing the state of the lubricant G when the roller chain 110 of the first embodiment of the present invention is engaged with and disengaged from the conventional sprocket 120.

  4A shows a state before the roller 115 of the roller chain 110 comes into contact with the lubricant G of the tooth bottom 122 of the sprocket 120 when the roller chain 110 meshes with the conventional sprocket 120. 4B is a state in which the roller 115 of the roller chain 110 approaches the tooth bottom portion 122 of the sprocket 120 from the state of FIG. 4A and the roller 115 is in contact with the lubricant G of the tooth bottom portion 122. 4C shows a state in which the roller 115 of the roller chain 110 further approaches the tooth bottom portion 122 of the sprocket 120 from the state of FIG. 4B and the roller 115 is in contact with the tooth bottom portion 122. FIG. FIG. 4C shows a state immediately after the roller 115 of the roller chain 110 is separated from the tooth bottom 122 of the sprocket 120 from the state of FIG. Is a state in which the roller 115 of the further roller chain 110 from the state of FIG. 4 (D) is separated from the tooth bottom 122 of the sprocket 120.

Note that the lubricant G is shown larger than the actual one so that the state of the lubricant G can be easily understood.
In order to facilitate understanding of the state of the lubricant G, only the lubricant G on the tooth bottom portion 122 side of the sprocket 120 is illustrated in the relationship between the roller outer peripheral surface 115a of the roller 115 and the tooth bottom portion 122 of the sprocket 120. The illustration of the lubricant on the roller outer peripheral surface 115a side of 115 is omitted.

As shown in FIGS. 1 to 4, the roller chain 110 according to the first embodiment of the present invention press-fits a pair of left and right inner link plates 111 and bush ends into the bush holes of the inner link plates 111. A bush 112, a pair of left and right outer link plates 114 arranged on both outer sides of the pair of left and right inner link plates 111, and a bush 112 are rotatably inserted into the pin holes of the outer link plate 114. A connecting pin 113 to be worn, and a roller 115 that is disposed between the pair of left and right inner link plates 111 and that freely pivotably fits on the outer periphery of the bush 112, and includes an inner link plate 111 and an outer link plate 114. Are alternately connected by bushes 112 and connecting pins 113 in the longitudinal direction of the chain, and the roller 115 is engaged with the sprocket 120. It is configured to.
The conventional sprocket 120 has a plurality of teeth 121 arranged at equal intervals in the circumferential direction of the sprocket 120 and a tooth bottom 122 formed between the plurality of teeth 121.

The roller 115 is formed into a spherical surface having the same radius of curvature at each part of the roller outer peripheral surface 115a.
As a result, when the roller chain 110 meshes with the sprocket 120 as the sprocket 120 rotates, the lubricant G between the roller 115 and the tooth bottom portion 122 is smoothly scraped from the center in the width direction to the side in the width direction. Extruded.

The movement of the lubricant G will be described in detail. As shown in FIG. 4A, when the roller chain 110 meshes with the sprocket 120 as the sprocket 120 rotates, the roller 115 of the roller chain 110 causes the tooth bottom 122 of the sprocket 120. It approaches the lubricant G having viscosity such as grease existing in.
Then, as shown in FIG. 4B, the roller 115 comes into contact with the lubricant G present in the tooth bottom portion 122.

At this time, since the roller 115 is formed into a spherical surface having the same radius of curvature at each portion of the roller outer peripheral surface 115 a, the lubricant G is caused to approach the width of the roller 115 at the tooth bottom portion 122 as the roller 115 approaches. It is pushed out smoothly so that it can be divided from the center of the direction to the side of the width direction.
Thereafter, as shown in FIG. 4C, the center in the width direction of the roller outer peripheral surface 115a of the roller 115 is in direct contact with the tooth bottom portion 122 of the sprocket 120, and the roller chain 110 is completely engaged with the sprocket 120 at this portion. It becomes.

4C, when the sprocket 120 is disengaged with the rotation of the sprocket 120, as shown in FIG. 4D, the center in the width direction of the roller outer peripheral surface 115a of the roller 115 is the sprocket 120. Apart from the tooth bottom 122.
At this time, the roller 115 is formed into a spherical surface having the same radius of curvature at each part of the roller outer peripheral surface 115a, so that the lubricant pushed out to the side in the width direction of the roller 115 at the tooth bottom 122 when meshing. Tension (surface tension) acts on G, and the laterally extending lubricant G is pulled and smoothly guided to the center in the width direction of the roller 115 at the tooth bottom 122.
Thereafter, as shown in FIG. 4E, the lubricant G on the lateral side of the roller 115 in the tooth bottom portion 122 is pulled and guided to the center in the width direction of the roller 115 in the tooth bottom portion 122. The roller outer peripheral surface 115a is smoothly separated from the lubricant G.
That is, an effect is obtained in which the position of the lubricant G returns to the position before the meshing and the oil is not easily run out.
Furthermore, the timing at which the shear force acts on the lubricant G is dispersed as compared with the conventional structure, and the maximum value of the magnitude of the shear force is reduced.

  In the roller chain 110 according to the first embodiment obtained in this way, the roller 115 is formed into a spherical surface having the same radius of curvature at each part of the roller outer peripheral surface 115a, so that the sprocket 120 can be rotated. Accordingly, the noise caused by the crushing of the lubricant G when the roller chain 110 is engaged with the sprocket 120 can be reduced, and the noise caused by the lubricant G when the engagement is released as the sprocket 120 rotates is reduced. The effect is enormous.

Next, the roller chain 210 of the chain transmission device 200 according to the second embodiment of the present invention will be described with reference to FIGS. 5 (A) and 5 (B).
Here, FIG. 5 (A) is a partial sectional plan view of a roller chain 210 of the second embodiment of the present invention, and FIG. 5 (B) is a second embodiment of the present invention. It is a side view of the roller chain 210 of.

The roller chain 210 of the second embodiment has a structure without the bush 112 of the roller chain 110 of the first embodiment, and since many elements are common to the roller chain 110 of the first embodiment, common matters Detailed description is omitted, and only the reference numerals in the 200s are used for the last two digits.
Since the sprocket of the second embodiment (not shown) is the same as the sprocket 120 of the first embodiment, the same reference numerals are used.

As shown in FIGS. 5A and 5B, the roller chain 210 according to the second embodiment of the present invention includes a pair of left and right inner link plates 211 and both outer sides of the pair of left and right inner link plates 211. A pair of left and right outer link plates 214, a connecting pin 213 that is inserted through the insertion hole of the inner link plate 211 and press-fits a pin end portion into the pin hole of the outer link plate 214, and a pair of left and right inner links Rollers 215 are disposed between the plates 211 and are rotatably fitted on the outer periphery of the connecting pin 213. The inner link plate 211 and the outer link plate 214 are alternately connected to each other in the longitudinal direction of the chain by the connecting pins 213. A large number of them are connected so that the rollers 215 mesh with the sprocket 120 (see FIGS. 3 and 4).
The roller 215 is formed into a spherical surface having the same radius of curvature at each part of the roller outer peripheral surface 215a.

Thus, when the roller chain 210 meshes with the sprocket 120 (see FIGS. 3 and 4) as the sprocket 120 rotates, the lubricant G is scraped from the center in the width direction of the roller 215 at the tooth bottom portion 122 to the side in the width direction. It is pushed out smoothly.
Further, when the mesh is disengaged, tension (surface tension) acts on the lubricant G between the roller outer peripheral surface 215a of the roller 215 and the tooth bottom portion 122 from the side in the width direction to the center in the width direction. It is smoothly guided from the side in the width direction to the center in the width direction to return to the state before meshing.
Further, it is not necessary to provide a member such as a bush which is not particularly necessary for improving the tensile strength.

  In the roller chain 210 according to the second embodiment obtained in this way, the roller 215 is formed into a spherical surface having the same radius of curvature at each part of the roller outer peripheral surface 215a, so that the sprocket 120 can be rotated. Accordingly, the noise caused by the crushing of the lubricant G when the roller chain 210 is engaged with the sprocket 120 can be reduced, and the noise caused by the lubricant G when the engagement is released as the sprocket 120 is rotated is reduced. In addition, the effect can be enormous, for example, the number of parts can be reduced and the cost of parts of the roller chain 210 can be reduced.

Next, a chain transmission device 300 according to a third embodiment of the present invention will be described with reference to FIGS.
Here, FIG. 6 is a perspective view of the sprocket 320 having a special tooth shape of the chain transmission device 300 according to the third embodiment of the present invention, and FIG. 7 is a special tooth profile of the chain transmission device 300 according to the third embodiment of the present invention. 8 (A) to 8 (C) show meshing between the roller chain 310 of the chain transmission device 300 of the third embodiment of the present invention and the sprocket 320 having a special tooth profile. 3 is a cross-sectional view of a sprocket 320 viewed from the circumferential direction. FIG.
Of these, FIG. 8A shows the state of the roller 315 with the reference A shown in FIG. 7, and FIG. 8B shows the state of the roller 315 with the reference B shown in FIG. These are the states of the roller 315 of the code | symbol C shown in FIG.

  The roller chain 310 of the chain transmission device 300 according to the third embodiment is the same as the roller chain 110 according to the first embodiment or the roller chain 210 according to the second embodiment. Since it is common with the roller chain 210 of the second embodiment, detailed description of the common items is omitted, and only the reference numbers in the 300 series having the last two digits are attached.

  The chain transmission device 300 according to the third embodiment of the present invention includes the same roller chain 310 as the roller chain 110 according to the first embodiment and a sprocket 320 having a special tooth shape. The chain transmission device 300 according to the third embodiment As shown in FIGS. 6 to 8, the sprocket 320 having a special tooth shape has a tooth portion 321 and a tooth bottom portion 322.

  Further, the tooth bottom portion 322 of the sprocket 320 has a groove portion 323 extending in the circumferential direction of the sprocket 320, and the groove portion 323 is located on the groove portion 323 at a side 323 b in the circumferential direction from the circumferential center 323 a of the sprocket 320. The height of the groove portion 323 from the upper edge to the bottom surface 323c decreases as the edge contacts the roller outer peripheral surface 315a and proceeds to the circumferential center 323a of the sprocket 320 in the groove portion 323, and the width between the upper edges of the groove portion 323 Is formed in a shape that allows contact between the roller outer peripheral surface 315a and the bottom surface 323c of the groove portion 323.

When the sprocket 320 shown in FIG. 7 rotates in the clockwise direction in FIG. 7, the roller 315 of the roller chain 310 changes its state in the order of reference symbol A, reference symbol B, reference symbol C and engages with the tooth bottom portion 322 of the sprocket 320. To do.
When the roller 315 engages with the tooth bottom 322, first, as shown in FIG. 7A and FIG. 8A, first, the circumferential side 323b from the circumferential center 323a of the sprocket 320 in the groove 323 of the tooth bottom 322. At the rear of the traveling direction, the upper edges on both sides in the width direction of the groove portion 323 are in contact with the roller outer peripheral surface 315a at two locations.
Thereby, the impact at the time of a contact is disperse | distributed.

7 and FIG. 8B, the roller 315 approaches the bottom surface 323c of the tooth bottom 322 around the axis of the roller 315 that precedes the preceding one.
After that, as shown in the reference C of FIG. 7 and FIG. 8C, the center in the width direction of the roller outer peripheral surface 315a is firmly in contact with the bottom surface 323c at the circumferential center 323a of the sprocket 320 in the tooth bottom 322.
Thereby, the rotational force of the sprocket 320 is firmly transmitted to the roller chain 310.
Further, the force of the roller chain 310 is firmly transmitted to the sprocket 320.
In short, the location where the impact at the time of contact at the contact location between the roller chain 310 and the sprocket 320 is dispersed is different from the location where the force is transmitted.

  Although the lubricant G (see FIG. 4) is not shown in FIGS. 6 to 8, even if the lubricant G is present in the groove portion 323 of the tooth bottom portion 322, the roller 315 has the roller outer peripheral surface 315a. Are formed in a spherical surface having the same radius of curvature, the lubricant G moves smoothly when the roller chain 310 is engaged with the sprocket 320 as the sprocket 320 rotates and when the engagement is released. Needless to say.

  The chain transmission 300 according to the third embodiment obtained in this manner has a groove 323 in which the tooth bottom 322 of the sprocket 320 extends in the circumferential direction of the sprocket 320, and the groove 323 is the groove 323. The upper edge of the groove 323 is in contact with the roller outer peripheral surface 315a at the side 323b in the circumferential direction from the circumferential center 323a of the sprocket 320 in the groove 323 and the bottom from the upper edge of the groove 323 toward the circumferential center 323a of the sprocket 320. It is formed in a shape that allows contact between the roller outer peripheral surface 315a and the bottom surface 323c of the groove 323 due to at least one of the height to 323c being reduced and the width between the upper edges of the groove 323 being increased. Makes it possible to reduce the noise when meshing, and also has good durability. Such reduction effect can be maintained for a long time, the effect is significant.

100, 200, 300 ... Chain transmission 110, 210, 310 ... Roller chain 111, 211 ... Inner link plate 112 ... Bush 113, 213 ... Connecting pin 114, 214 ... Out Link plates 115, 215, 315 ... Rollers 115a, 215a, 315a ... Roller outer peripheral surface 120 ... (conventional type) sprocket 121 ... Tooth part 122 ... Tooth bottom part
320... (Special tooth profile) sprocket
321 tooth part
322... Tooth bottom
323 ... Groove
323a ... Center of sprocket in groove direction
323b ・ ・ ・ Sprocket circumferential side in groove
323c ... Bottom surface G in the circumferential center of the groove part ... Lubricant

Claims (3)

A pair of left and right inner link plates; a bush for press-fitting a bushing end into a bush hole of the inner link plate; a pair of left and right outer link plates respectively disposed on both outer sides of the pair of left and right inner link plates; A connecting pin that is rotatably inserted into the bush and is press-fitted into the pin hole of the outer link plate, and is disposed between the pair of left and right inner link plates, and is freely rotatable around the bush. In a roller chain that includes a roller to be fitted, the inner link plate and the outer link plate are alternately connected in the longitudinal direction of the chain with bushes and connecting pins, and the roller is meshed with the sprocket.
A roller chain, wherein the roller is formed into a spherical surface having the same radius of curvature at each part of the outer peripheral surface of the roller. A pair of left and right inner link plates, a pair of left and right outer link plates respectively disposed on both outer sides of the pair of left and right inner link plates, and inserted into the insertion holes of the inner link plate and pin-ended to the pin holes of the outer link plate A connecting pin for press-fitting a portion, and a roller that is disposed between the pair of left and right inner link plates and that freely swingably fits on the outer periphery of the connecting pin, the inner link plate and the outer link plate, In a roller chain in which a plurality of rollers are alternately connected with a connecting pin in the longitudinal direction of the chain and the roller is meshed with the sprocket,
A roller chain, wherein the roller is formed into a spherical surface having the same radius of curvature at each part of the outer peripheral surface of the roller. A chain composed of a roller chain formed by alternately connecting a pair of left and right inner link plates and a pair of left and right outer link plates in the longitudinal direction by connecting pins, and a sprocket having tooth portions and tooth bottom portions that mesh with the roller chains. In the transmission,
The roller chain is a roller chain according to claim 1 or claim 2,
The sprocket tooth bottom has a groove extending in the circumferential direction of the sprocket, and the groove is lateral to the circumferential center of the sprocket in the groove and the upper edge of the groove is in contact with the outer circumferential surface of the roller. Contact between the outer peripheral surface of the roller and the bottom surface of the groove portion due to at least one of the height from the upper edge to the bottom surface of the groove portion becoming lower and the width between the upper edges of the groove portion becoming wider as proceeding to the circumferential center of the sprocket It is formed in the shape which accept | permits a chain transmission device characterized by the above-mentioned.

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